Description:FIELD OF THE INVENTION
[0001] The present invention relates to the vapor compression refrigeration system useful for removing hydrocarbon gasoline vapors and water content separately from the air-vapor mixture emerging from gasoline underground storage tank (UST) at petrol station.

BACKGROUND OF THE INVENTION
[0002] Background description includes information that may be useful in understanding the present invention. It is not an admission that any of the information provided herein is prior art or relevant to the presently claimed invention, or that any publication specifically or implicitly referenced is prior art.
[0003] A patent application is sought for an invention relating to a petrol pump station in the hydrocarbon sector, which addresses the significant issue of volatile organic compounds (VOCs) emissions caused by vapor loss during vehicle refueling and unloading of tankers. These emissions pose health risks to people due to exposure to toxic substances, including carcinogenic components such as benzene, toluene, and xylene present in VOCs. Furthermore, the evaporation of valuable fuels leads to economic losses.
[0004] Typically, when a gasoline delivery tanker arrives at a petrol station, it is connected to an underground tank via a hose to unload the gasoline for immediate sale to vehicles. The process results in the release of vapors from the underground tank. If left uncontrolled, these vapors escape into the atmosphere, contributing to environmental pollution. While gasoline distribution and vehicle refueling account for only 5% of total VOC emissions, the concentration of these emissions is significant at gasoline service stations and bulk storage facilities.
[0005] In urban areas, particularly in metro cities in India, petrol station operations are dynamic, involving three major activities simultaneously: fuel dispensing to vehicles using a coaxial nozzle, collection of fugitive vapor through the same coaxial nozzle via a stage II recovery system, and unloading of tankers. Under these conditions, humid air often enters the stage II system and the underground storage tank (UST) during night operations. Internationally, stage II recovery systems operate with an air-to-vapor ratio of 1.2-1.5, allowing air to enter the system. However, the presence of additional humid air in a cryogenic system reduces its performance by freezing or blocking the heat exchanger modules and associated pipelines, hindering the flow towards the recovery chambers.
[0006] The fuel vapor recovery system described in WO 2009/013544 is a known feature of a vapor recovery system based on the condensation approach, focusing on gasoline recovery. This system includes a concertina arrangement of heat exchangers for condensing gasoline vapors. US 20190308869A1 discloses a cryogenic vapor recovery system for gasoline recovery that utilizes coalescing mesh modules. The cryogenic condensation modules are connected to a compressor to maintain different temperatures within the chambers. However, this system does not provide a mechanism for separating water and gasoline.
[0007] Other published patents, such as US 5,220,799A, 5,006,138A, 5,566,555A, 3,894,942, and WO 2014/030923A1, describe various methods and systems for vapor recovery with different approaches. However, none of these patents address the separate removal of water and gasoline using a series of S-shaped modules as a heat exchanger device to increase the heat transfer area, establish different temperature zones within a series of chambers, and enhance the efficiency of gasoline vapor recovery.
[0008] Therefore, there is a need for an improved system and method to recover gasoline vapors, maintain consistent equipment efficiency by eliminating freezing and plugging issues caused by surrounding moisture (humid air), and effectively prevent vapor escape into the atmosphere from various sources at petrol stations.

OBJECTS OF THE INVENTION
[0009] An objective of the present disclosure is to provide a gasoline vapor recovery system for petrol station.
[0010] Another objective of the present disclosure is to provide a method of gasoline vapor recovery for petrol station.
[0011] Another objective of the present disclosure is to provide a method to enhance the efficiency of gasoline vapor recovery.
[0012] Yet another objective of the present disclosure is to provide a system for separating water and gasoline.

SUMMARY OF THE INVENTION
[0013] This summary is provided to introduce a selection of concepts in a simplified form that are further described below in Detailed Description section. This summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter.
[0014] An aspect of the present disclosure is to provide a gasoline vapor recovery system for petrol station comprising: an inlet line (20) for entering a gaseous mixture containing air, moisture and gasoline vapors from a gasoline underground storage tank (UST) to a first chamber (50); a second chamber (60) is connected with the first chamber (50) in a series through a connecting pipe, wherein the first chamber (50) and the second chamber (60) contain a series of heat transfer S-shape modules (40A and 40B) comprises a corrugated plate connected to a U-tube, through which the refrigerant gas passes, wherein the first chamber (50) maintains a non-cryogenic condition across the sealed chamber and the second chamber (60) maintains a cryogenic temperature controlled by a compressor located in a chiller unit (10); a perforated plate (110) is equipped in the first chamber (50) and the second chamber (60) at the bottom provides resistance to the downward flow of incoming gases and allows the condensed liquid to pass through gradually, collecting water molecule in a chamber (50A) and gasoline vapor recovery in a chamber (60A), respectively; and a gravity settler arrangements (100A/B) are incorporated to prevent contamination of the gasoline product and includes separate valves for water drainage (90) and gasoline return to the UST via valve (80).
[0015] Another aspect of the present disclosure is to provide a method of gasoline vapor recovery for petrol station comprising: passing a gaseous mixture containing air, moisture and gasoline vapors through inlet line (20) from a gasoline underground storage tank (UST) to a first chamber (50) followed by a second chamber (60), wherein the first chamber (50) and the second chamber (60) contain a series of heat transfer S-shape modules (40A and 40B) comprises a corrugated plate connected to a U-tube, through which the refrigerant gas passes; maintaining a non-cryogenic condition across the first chamber (50) to remove moisture from the gaseous mixture by condensing the water molecule and collecting in a chamber (50A); and maintaining a cryogenic condition in the second chamber (60) to condense the gasoline and collecting in chamber (60A) and is drained into the UST.
[0016] Various objects, features, aspects and advantages of the inventive subject matter will become more apparent from the following detailed description of preferred embodiments.

BRIEF DESCRIPTION OF THE DRAWINGS
[0017] The accompanying drawings are included to provide a further understanding of the present disclosure and are incorporated in and constitute a part of this specification. The drawings illustrate exemplary embodiments of the present disclosure and, together with the description, serve to explain the principles of the present disclosure.
[0018] FIG. 1: illustrates gasoline vapor recovery system.
[0019] FIG. 2: illustrates S-shape module comprises a corrugated plate connected to a U-tube.
[0020] FIG. 3: illustrates heat exchanger with three temperature probes T1, T2 and T3. T3 (less cooling temperature) < T2 (moderate cooling temperature) < T1 (more cooling temperature).

DETAILED DESCRIPTION OF THE INVENTION
[0021] The following is a detailed description of embodiments of the disclosure. The embodiments are in such detail as to clearly communicate the disclosure. However, the amount of detail offered is not intended to limit the anticipated variations of embodiments; on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the present disclosure as defined by the appended claims.
[0022] Unless the context requires otherwise, throughout the specification which follow, the word “comprise” and variations thereof, such as, “comprises” and “comprising” are to be construed in an open, inclusive sense that is as “including, but not limited to.”
[0023] As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” include plural referents unless the content clearly dictates otherwise. It should also be noted that the term “or” is generally employed in its sense including “and/or” unless the content clearly dictates otherwise.
[0024] In some embodiments, the numbers expressing quantities of ingredients, properties such as concentration, reaction conditions, and so forth, used to describe and claim certain embodiments of the invention are to be understood as being modified in some instances by the term “about.” Accordingly, in some embodiments, the numerical parameters set forth in the written description are approximations that can vary depending upon the desired properties sought to be obtained by a particular embodiment. In some embodiments, the numerical parameters should be construed in light of the number of reported significant digits and by applying ordinary rounding techniques. Notwithstanding that the numerical ranges and parameters setting forth the broad scope of some embodiments of the invention are approximations, the numerical values set forth in the specific examples are reported as precisely as practicable.
[0025] The recitation of ranges of values herein is merely intended to serve as a shorthand method of referring individually to each separate value falling within the range. Unless otherwise indicated herein, each individual value is incorporated into the specification as if it is individually recited herein.
[0026] All processes described herein can be performed in any suitable order unless otherwise indicated herein or otherwise clearly contradicted by context. The use of any and all examples, or exemplary language (e.g., “such as”) provided with respect to certain embodiments herein is intended merely to better illuminate the invention and does not pose a limitation on the scope of the invention otherwise claimed. No language in the specification should be construed as indicating any non-claimed element essential to the practice of the invention.
[0027] The headings and abstract of the invention provided herein are for convenience only and do not interpret the scope or meaning of the embodiments.
[0028] The following discussion provides many example embodiments of the inventive subject matter. Although each embodiment represents a single combination of inventive elements, the inventive subject matter is considered to include all possible combinations of the disclosed elements. Thus, if one embodiment comprises elements A, B, and C, and a second embodiment comprises elements B and D, then the inventive subject matter is also considered to include other remaining combinations of A, B, C, or D, even if not explicitly disclosed.
[0029] All publications herein are incorporated by reference to the same extent as if each individual publication or patent application were specifically and individually indicated to be incorporated by reference. Where a definition or use of a term in an incorporated reference is inconsistent or contrary to the definition of that term provided herein, the definition of that term provided herein applies and the definition of that term in the reference does not apply.
[0030] Groupings of alternative elements or embodiments of the invention disclosed herein are not to be construed as limitations. Each group member can be referred to and claimed individually or in any combination with other members of the group or other elements found herein. One or more members of a group can be included in, or deleted from, a group for reasons of convenience and/or patentability. When any such inclusion or deletion occurs, the specification is herein deemed to contain the group as modified thus fulfilling the written description that follows, and the embodiments described herein, is provided by way of illustration of an example, or examples, of particular embodiments of the principles and aspects of the present disclosure. These examples are provided for the purposes of explanation, and not of limitation, of those principles and of the disclosure.
[0031] It should also be appreciated that the present invention can be implemented in numerous ways, including as a system, a method or a device. In this specification, these implementations, or any other form that the invention may take, may be referred to as processes. In general, the order of the steps of the disclosed processes may be altered within the scope of the invention.
[0032] Various terms as used herein are shown below. To the extent a term used in a claim is not defined below, it should be given the broadest definition persons in the pertinent art have given that term as reflected in printed publications and issued patents at the time of filing.
[0033] The present invention is a multistage vapor recovery system consisting of a series of S-shaped modules with refrigerant flow inside the tubes. This configuration enables the temperature reduction in each zone using a single compressor. The system effectively reduces the moisture content from the air-gasoline vapor mixture before the cryogenic step and separates water as a by-product. By separating condensed water and gasoline, the system ensures constant performance, which is particularly beneficial in highly humid climates commonly found in India and the Asia-Pacific region. Thus, the present invention efficiently separates removal of water and gasoline using a series of S-shaped modules as a heat exchanger device to increase the heat transfer area, establish different temperature zones within a series of chambers, and enhance the efficiency of gasoline vapor recovery.
[0034] An embodiment of the present disclosure is to provide a gasoline vapor recovery system for petrol station comprising: an inlet line (20) for entering a gaseous mixture containing air, moisture and gasoline vapors from a gasoline underground storage tank (UST) to a first chamber (50); a second chamber (60) is connected with the first chamber (50) in a series through a connecting pipe, wherein the first chamber (50) and the second chamber (60) contain a series of heat transfer S-shape modules (40A and 40B) comprises a corrugated plate connected to a U-tube, through which the refrigerant gas passes, wherein the first chamber (50) maintains a non-cryogenic condition across the sealed chamber and the second chamber (60) maintains a cryogenic temperature controlled by a compressor located in a chiller unit (10); a perforated plate (110) is equipped in the first chamber (50) and the second chamber (60) at the bottom provides resistance to the downward flow of incoming gases and allows the condensed liquid to pass through gradually, collecting water molecule in a chamber (50A) and gasoline vapor recovery in a chamber (60A), respectively; and a gravity settler arrangements (100A/B) are incorporated to prevent contamination of the gasoline product and includes separate valves for water drainage (90) and gasoline return to the UST via valve (80).
[0035] In an embodiment, the S-shape modules (40A and 40B) are positioned in the middle of the first chamber (50) and second chamber (60), serving as heat exchanger enhancer modules or processing elements.
[0036] In an embodiment, the system comprises individual outlets that enable the independent separation of water, gasoline, and non-condensable gas.
[0037] In an embodiment, the system provides different temperatures within the S-shape modules (40A and 40B) to achieve non-cryogenic and cryogenic conditions within the chambers.
[0038] In an embodiment, the S-shape modules (40A and 40B) consist of U-tube bundles through which refrigerant gas passes, optimized for surface area to facilitate the establishment of multiple temperature zones. The S-shape modules (40A and 40B) have a temperature difference in the range from 2-20 °C within the chambers, preferably in the ranges of 2-6 ?, 3-9 ?, and 8-15 ? within the chambers.
[0039] In an embodiment, the first chamber (50) removes moisture from the gaseous mixture before reaching the actual cryogenic conditions in the second chamber (60).
[0040] In an embodiment, the perforated plate (110) has smaller diameter of the holes than the space between two S-shape module (40A and 40B) assemblies.
[0041] In an embodiment, the first chamber (50) consists of one S-shape modules (40A and 40B). The second chamber (60) consists of three S-shape modules (40A and 40B).
[0042] In an embodiment, the chambers are provided with proper insulation to minimize heat loss to the atmosphere during operations.
[0043] In an embodiment, the system has the moisture removal efficiency in the range of 85% to 95% in the first chamber, preferably in the range of 90% to 95%.
[0044] In an embodiment, the system has the gasoline vapor recovery in the range of 85% to 98% in the second chamber, preferably in the range of 95% to 98%.
[0045] Another embodiment of the present disclosure is to provide a method of gasoline vapor recovery for petrol station comprising: passing a gaseous mixture containing air, moisture and gasoline vapors through inlet line (20) from a gasoline underground storage tank (UST) to a first chamber (50) followed by a second chamber (60), wherein the first chamber (50) and the second chamber (60) contain a series of heat transfer S-shape modules (40A and 40B) comprises a corrugated plate connected to a U-tube, through which the refrigerant gas passes; maintaining a non-cryogenic condition across the first chamber (50) to remove moisture from the gaseous mixture by condensing the water molecule and collecting in a chamber (50A); and maintaining a cryogenic condition in the second chamber (60) to condense the gasoline and collecting in chamber (60A) and is drained into the UST.
[0046] In an embodiment, the non-cryogenic condition includes 15 °C to (-) 5 °C.
[0047] In an embodiment, the cryogenic condition includes (-) 5 °C to (-) 200 °C.
[0048] In an embodiment, the present invention relates to a vapor recovery system and provides additional advantages. In some embodiment, the system of the present invention is designed to connect to a gasoline tank and consists of two chambers of different sizes placed within a larger chamber. These chambers enable the achievement of two different temperatures: non-cryogenic (dehumidification) and cryogenic temperatures (moderate and super cooling). To attain multi-stage temperatures, a series of S-shape or Z-shape modules are employed as heat exchanger enhancer modules. The S-shape module comprises a corrugated plate connected to a U-tube, through which the refrigerant gas flows, acting as a heat enhancer during the processing. A single compressor is housed in the chiller unit and performs the vapor compression refrigeration cycle. The use of two smaller chambers, as opposed to a large chamber, allows for faster process conditions with minimal energy requirements and enhances the contact area by facilitating flow diversion in the processing modules located in the middle of the chambers.
[0049] The first chamber is responsible for moisture removal by achieving a non-cryogenic processing condition before the subsequent cryogenic step in the following chamber. These chambers maintain multi-temperature conditions due to the internal geometry of the S-shape assembly, which is specifically designed for the effective removal of moisture from the gaseous mixture. This design advantageously prevents freezing and plugging in the heat exchanger internals due to the unavoidable moisture present in the UST, ensuring constant separation efficacy throughout the operation.
[0050] In a preferred embodiment, the aforementioned processing element is an S-shape or Z-shape module encapsulated within each chamber. The void age within the S-shape module is designed to minimize pressure drop, maximize heat transfer area, and achieve a multi-temperature regime for the effective condensation of the hydrocarbon gaseous mixture. The condensation process begins from the tip of the module and proceeds to the surface of the U-tube, with a reasonable temperature difference that enables the recovery of constituents.
[0051] The refrigerant gas circulates inside the U-tube of the heat exchanger module, which is placed within the chamber. The circulation is controlled by expansion and solenoid valves connected to a compressor, allowing for the desired temperature conditions to be achieved. Vapors from the underground tank enter the vapor recovery system through an inlet line and pass over a series of S-shape or Z-shape modules. The system maintains a non-cryogenic temperature condition followed by a cryogenic temperature for the removal of moisture and other higher hydrocarbon components (gasoline vapors). The recovered condensable products, such as water and liquid gasoline, are collected and separated individually from each chamber. In the first chamber, a gravity level separator is used to collect and separate the water and gasoline mixture. In the second chamber, the condensed gasoline is drained into the UST while sufficiently maintaining the level in the level separator to prevent contamination with traces of water trapped during the condensation process.
[0052] The system described in the present invention effectively processes highly humid air present in the air-vapor gaseous mixture, which is typically unavoidable in petrol station operations. The presence of moisture in the atmosphere is common in India and the Asia-Pacific region, where humidity levels can reach 100%.
[0053] The present invention is depicted schematically in FIG. 1, FIG. 2, and FIG. 3. It involves a system installed on the vent line of a gasoline UST at a petrol station. The gaseous mixture gradually released from the UST during gasoline unloading and stage II operation enters the vapor recovery system through pipe 20.
[0054] The air-vapor mixture then passes through chambers 50 and 60, where condensation takes place, and liquid gasoline is collected in 50A and 60A, respectively. The system, as per the present invention, consists of two sets of condensing chambers incorporating S-shape modules (40A/B). These modules are designed to prevent the release of gasoline vapor into the environment while enhancing the recovery process.
[0055] In particular, the first chamber 50 serves the purpose of moisture removal using S-shape modules, namely 40A and 40B (FIG. 1, FIG.3), placed inside the chamber. On the other hand, the second chamber is responsible for separating and collecting liquid gasoline, operating at different temperatures compared to the first chamber. According to the present invention, the S-shape modules in both sealed chambers maintain different temperatures, providing an additional heat transfer area for efficient gasoline recovery and moisture separation. These heat exchange enhancer modules, 40A/40B, are connected to the compressor through respective expansion and solenoid valves, utilizing an industrial chiller for achieving different temperatures inside the chambers. The industrial chiller unit operates based on the refrigeration cycle depicted as 10.
[0056] The gaseous mixture from pipe 20 enters the first chamber 50, which is connected in series with the second chamber 60 through a connecting pipe. The first chamber 50 maintains a non-cryogenic condition across the sealed chamber, primarily to prevent freezing and plugging of the heat transfer modules caused by moisture in the humid air-vapor mixture. The modular assembly facilitates a smooth flow of the gaseous mixture by minimizing pressure drop through the S-shape module (FIG. 2, FIG. 3) positioned in the middle of the first chamber 50. The second chamber 60 also contains heat transfer modules 40A/40B to accommodate the cryogenic condition. This chamber is responsible for condensing gasoline vapors, which then trickle down as liquid gasoline into the collection chamber, 60A. The dimensions of the chambers are optimized to facilitate fast processing conditions.
[0057] The system according to the present invention enables the removal of moisture from the gaseous mixture (which is unavoidable in the context of petrol station operations) with an efficiency reduction of >85-95%.
[0058] These chambers, 50 and 60, are equipped with a perforated plate 110 at the bottom of each chamber, which provides resistance to the downward flow of incoming gases and allows the condensed liquid to pass through gradually, collecting in tanks 50A and 60A, respectively. Both collection chambers, 50A and 60A, incorporate a gravity settler arrangement 100A/B to prevent contamination of the gasoline product. The gravity settler includes separate valves for water drainage (90) and gasoline return to the UST via valve 80. Chamber 60 maintains a cryogenic temperature controlled by the compressor located in unit 10. The cryogenic modules within chamber 60 maintain the temperature in a way that enables the recovery of over 95% of gasoline vapors, liquefying and precipitating them into collection chamber 60A.
[0059] Chambers 50 and 60 consist of one and three S-shape modules, respectively, to accommodate different temperatures. Throughout the modules, three temperature probes are connected, which indicate and record the temperature zones inside the modules, enabling monitoring of the operational performance and efficiency of the system (Fig. 3).
[0060] According to the invention, different temperature zones can be sequentially achieved in the chambers using a single compressor. This minimizes the capital and operating costs of the equipment and provides an attractive payback period on the investment (depending on the gasoline selling capacity of the station). The chiller assembly, placed inside unit 10, comprises components such as a compressor, expansion valve, filters, receiving tank, and refrigerant gas R404. These components are well-known and omitted from the FIG. 1. Additionally, proper insulation has been provided in all chambers to minimize heat loss to the atmosphere during operations.

ADVANTAGES OF THE PRESENT INVENTION
[0061] According to the invention, the gaseous mixture is initially treated in the first chamber under non-cryogenic conditions to reduce moisture, remaining non-condensed gaseous is treated in the second chamber at cryogenic temperatures, primarily for gasoline condensation. The different temperature zones can be sequentially achieved in the chambers using a single compressor. This minimizes the capital and operating costs of the equipment and provides an attractive payback period on the investment (depending on the gasoline selling capacity of the station).
[0062] The present invention allows for faster process conditions with minimal energy requirements and enhances the contact area by facilitating flow diversion in the processing modules located in the middle of the chambers.
[0063] The system reduces moisture build-up in the UST, thereby eliminating the need for frequent cleaning cycles at petrol stations.
[0064] The moisture removal efficiency of the present invention ranges from 85% to 95%, preferably within the range of 90% to 95%, in the first chamber.
[0065] The gasoline vapor recovery of the present invention ranges from 85% to 98%, preferably within the range of 95% to 98%, in the second chamber.
[0066] Table 1 indicates that the present invention is better than the adsorption system and refrigeration system. The present invention showed 98.71% reduction in total hydrocarbons, 95.26% reduction in benzene, 96.67% reduction in toluene, 96.20% reduction in P-xylene and 96.98% reduction in O-xylene which are higher that the adsorption system and refrigeration system. The present invention also reduces the energy requirements as compared to adsorption system and refrigeration system.
[0067] While the foregoing describes various embodiments of the disclosure, other and further embodiments of the disclosure may be devised without departing from the basic scope thereof. The invention is not limited to the described embodiments, versions or examples, which are included to enable a person having ordinary skill in the art to make and use the invention when combined with information and knowledge available to the person having ordinary skill in the art.
EXAMPLES
[0068] The present invention is further explained in the form of following examples. However, it is to be understood that the following examples are merely illustrative and are not to be taken as limitations upon the scope of the invention.
Example 1
[0069] Vapors from the underground tank were entered the vapor recovery system through an inlet line and passed over a series of S-shape or Z-shape modules. The system was maintained a non-cryogenic temperature condition followed by a cryogenic temperature for the removal of moisture and other higher hydrocarbon components (gasoline vapors). The recovered condensable products, such as water and liquid gasoline, were collected and separated individually from each chamber. Comparison of vapor recovery systems with the present invention are given in Table 1 below:

Table 1: Comparison of vapor recovery systems with the present invention
Parameters Unit Vapor Inlet Adsorption System Refrigeration System Present Invention Energy Requirement (Kw/hr)
Vapor Outlet % Reduction Vapor Outlet % Reduction Vapor Outlet % Reduction Adsorption Refrigeration Present Invention
Total Hydrocarbon mg/lit 3,50,000 48,000 86.29% 53,000 84.86% 4,500 98.71% 10 18 5
Benzene mg/lit 380 80 78.95% 75 80.26% 18 95.26%
Toluene mg/lit 180 28 84.44% 30 83.33% 6 96.67%
P-Xylene mg/lit 92 25 72.83% 20 78.26% 3.5 96.20%
O-Xylene mg/lit 58 15 74.14% 10 82.76% 1.75 96.98%

[0070] It is indicated from the Table 1 that the present invention is better than the adsorption system and refrigeration system. The present invention showed 98.71% reduction in total hydrocarbons, 95.26% reduction in benzene, 96.67% reduction in toluene, 96.20% reduction in P-xylene and 96.98% reduction in O-xylene. The present invention also reduces the energy requirements as compared to adsorption system and refrigeration system.
[0071] The foregoing examples are merely illustrative and are not to be taken as limitations upon the scope of the invention. Various changes and modifications to the disclosed embodiments will be apparent to those skilled in the art. Such changes and modifications may be made without departing from the scope of the invention.
, Claims:1. A gasoline vapor recovery system for petrol station comprising:
an inlet line (20) for entering a gaseous mixture containing air, moisture and gasoline vapors from a gasoline underground storage tank (UST) to a first chamber (50);
a second chamber (60) is connected with the first chamber (50) in a series through a connecting pipe, wherein the first chamber (50) and the second chamber (60) contain a series of heat transfer S-shape modules (40A and 40B) comprises a corrugated plate connected to a U-tube, through which the refrigerant gas passes, wherein the first chamber (50) maintains a non-cryogenic condition across the sealed chamber and the second chamber (60) maintains a cryogenic temperature controlled by a compressor located in a chiller unit (10);
a perforated plate (110) is equipped in the first chamber (50) and the second chamber (60) at the bottom provides resistance to the downward flow of incoming gases and allows the condensed liquid to pass through gradually, collecting water molecule in a chamber (50A) and gasoline vapor recovery in a chamber (60A), respectively; and
a gravity settler arrangements (100A/B) are incorporated to prevent contamination of the gasoline product and includes separate valves for water drainage (90) and gasoline return to the UST via valve (80).
2. The gasoline vapor recovery system as claimed in claim 1, wherein the S-shape modules (40A and 40B) are positioned in the middle of the first chamber (50) and second chamber (60), serving as heat exchanger enhancer modules or processing elements.
3. The gasoline vapor recovery system as claimed in claim 1, wherein the system comprises individual outlets that enable the independent separation of water, gasoline, and non-condensable gas.
4. The gasoline vapor recovery system as claimed in claim 1, wherein the system provides different temperatures within the S-shape modules (40A and 40B) to achieve non-cryogenic and cryogenic conditions within the chambers.
5. The gasoline vapor recovery system as claimed in claim 1, wherein the S-shape modules (40A and 40B) consist of U-tube bundles through which refrigerant gas passes, optimized for surface area to facilitate the establishment of multiple temperature zones.
6. The gasoline vapor recovery system as claimed in claim 1, wherein the S-shape modules (40A and 40B) have a temperature difference in the range from 2-20 °C within the chambers.
7. The gasoline vapor recovery system as claimed in claim 1, wherein the first chamber (50) removes moisture from the gaseous mixture before reaching the actual cryogenic conditions in the second chamber (60).
8. The gasoline vapor recovery system as claimed in claim 1, wherein the perforated plate (110) has smaller diameter of the holes than the space between two S-shape module (40A and 40B) assemblies.
9. The gasoline vapor recovery system as claimed in claim 1, wherein the first chamber (50) consists of one S-shape modules (40A and 40B).
10. The gasoline vapor recovery system as claimed in claim 1, wherein the second chamber (60) consists of three S-shape modules (40A and 40B).
11. The gasoline vapor recovery system as claimed in claim 1, wherein the chambers are provided with proper insulation to minimize heat loss to the atmosphere during operations.
12. The gasoline vapor recovery system as claimed in claim 1, wherein the system has the moisture removal efficiency in the range of 85% to 95% in the first chamber.
13. The gasoline vapor recovery system as claimed in claim 1, wherein the system has the gasoline vapor recovery in the range of 85% to 98% in the second chamber.
14. A method of gasoline vapor recovery for petrol station comprising:
passing a gaseous mixture containing air, moisture and gasoline vapors through inlet line (20) from a gasoline underground storage tank (UST) to a first chamber (50) followed by a second chamber (60), wherein the first chamber (50) and the second chamber (60) contain a series of heat transfer S-shape modules (40A and 40B) comprises a corrugated plate connected to a U-tube, through which the refrigerant gas passes;
maintaining a non-cryogenic condition across the first chamber (50) to remove moisture from the gaseous mixture by condensing the water molecule and collecting in a chamber (50A); and
maintaining a cryogenic condition in the second chamber (60) to condense the gasoline and collecting in chamber (60A) and is drained into the UST.
15. The method as claimed in claim 14, wherein the non-cryogenic condition include 15 ? C to (-) 5 ? C.
16. The method as claimed in claim 14, wherein the cryogenic condition includes (-) 5 ? C to (-) 200 ? C.