Claims:WE CLAIM:
1. A system for capturing velocity data across Electro Static Precipitator (ESP) fields, comprising:
A vertical moving slider (4);
A set of 2 anemometers (1 & 2);
A collecting electrode profile (5);
A motor (6); and
A gripping wheel (3)
Characterized that said anemometers (1 & 2) are attached with said slider (4) which moves vertically up and down with the help of said motor (6) and said gripping wheel (3) along the edge of said electrode profile (5) to capture velocity data across ESP fields of a boiler.

2. The system as claimed in claim 1, wherein said motors (6) are DC servo motor or stepper motor.

3. The system as claimed in claim 1, wherein said slider (4) moves up and down with the help of anti-sliding mechanism.

4. The system as claimed in claim 1, wherein said motors (6) are controller by microcontroller/ PLC based system.

5. The system as claimed in claim 1, wherein captured velocity data is stored in a local memory.
, Description:FIELD OF THE INVENTION
The present invention in general relates to the field of electrostatic precipitator (ESP). The present invention in particular relates to an automated mechanized system for capturing velocity data across the ESP fields using anemometer.
BACKGROUND OF THE INVENTION
An electrostatic precipitator (ESP) is a filtration device that removes dust particles, from a flowing gas using the force of an induced electrostatic charge for ionization of dust particles passing through the unit/ESP.
ESP is one important boiler auxiliary in any typical coal fired boiler used for collecting the ash from the flue gas produced out of coal firing from the boiler. Typical ESP is shown in Fig 1.
The ESP have a set of collecting and emitting electrodes arranged in vertical rows hanging/suspended from roof top with a gap of 200 mm between two. ESP is divided into number of passes in parallel and each pass will have many fields in series.
It is necessary to ensure uniform distribution of gas across the ESP fields to ensure maximum dust/ash collection on both collecting and emitting electrodes. In general by virtue of its construction due to gas ducts and funnels and also the ID fans, the gas flow may not be uniform over the cross section of the ESP fields. It is necessary to conduct gas distribution test before the ESP is commissioned.
Present method of the gas distribution test:
A team of Engineers enter in to the ESP with all man holes closed in the gas and air circuit of the boiler system, and ID and FD fans are ON, a person goes to top with the help of available structures and collect the air velocity readings at (Approximately) 800mmX800mm grid by using wind vane anemometers and the readings will be recorded by another person. A typical ESP will have a cross section of 15 meters X 15 meters which takes longer time for taking readings at every grid point of 800mm x 800mm which is cumbersome and needs lot of manual effort. On completion of one set of readings, they are evaluated and coefficient of variation is calculated and the zones of high, medium and low velocities across the cross section are identified. Deflection plates are used to divert air stream from high velocity zones to medium and low velocity zones by duly fixing the plates on the gas distribution plates (perforated plates–GD Screens), arranged in two stages (Primary & secondary) at the inlet of the each pass (i.e. between inlet funnel and the first field). Again the crew takes second set of readings at all the points as done in the previous set and the exercise continues on trial and error basis till required coefficient of variation is reached.

With the use of this technology it is expected to reduce the cycle time of testing by 40% and human effort by 50%.
In view of this, few inventions have been developed which relates to automatic testing and analysis of the Gas distribution tests being conducted in ESP. For instance patents EP2504109A1 and WO2011063996A1 reveals that Process of taking reading manually is very long and monotonous. As large ESPs generally have quite a high number of collecting electrodes, the total number of measurements is also a high figure. Accuracy sometimes is not the best as the present method cause human fatigue. In very large ESP, to keep the efforts reasonable, measurements are done at lesser measurement points (generally by skipping alternate points). This affects the quality of results adversely. Collection of data is not accurate as manually person measuring the data from heights has to record with the help of another person standing down by hear say. This lead to sometimes either wrong recording of data or few missed points while recording. In few ESP designs, where human access is difficult due to small gaps, direct measurement of gas distribution is even not feasible.
EP2504109A1 also reveals a method for measuring gas distribution in an ESP having at least one collecting electrode includes the steps of installing inside the ESP, at least one probe carrier comprising of at least one air velocity probe adapted to collect and record air velocity readings; the probe carrier being remotely controlled and removable, mounting the probe carrier on the surface of the collecting electrode; moving the probe carrier along the collecting electrode surface covering full height of electrode, the probe carrier move being controlled remotely by a display controller, capturing and recording a plurality of air velocity readings while moving the probe carrier along the surface of the collecting electrode, and like this repeating this procedure on other collecting electrodes sufficient times to cover entire cross section of the electrostatic precipitator.
In both the cases it shows that a probe carrier moves on the surface of the collecting electrodes and carries an anemometer for capturing velocity data.
None of the prior arts could provide a system for capturing velocity data at two points at a time and also for the system which moves along the collecting electrode edge.
OBJECTS OF THE INVENTION
It is therefore an object of the invention to capture and store velocity data of an ESP.
A further objective of the invention is to capture and store velocity data of an ESPusing anemometer.
Yet another objective of the present invention is to capture and store velocity data of an ESPat specified points by automatically holding and moving up along the edge of the collecting electrode.
SUMMARY OF THE INVENTION
According to the present invention, a system forcapturing velocity data across Electro Static Precipitator (ESP) fields is disclosed.The system according to the present invention comprises of a vertical moving slider(4). Said vertical moving slider (4) travel in a pre-programmed vertical direction with the help of servo/stepper motors (6), gripper wheels (3) and an anti-sliding mechanism. Said vertical moving slider (4) carries a set of two anemometers (1 & 2). Said anemometers (1 & 2) capture the air velocity readings at every 800 mm grid points and the velocity data will be stored in local memory in a prescribed format. The vertical movement of said slider (4) is supported by a collecting electrode profile (5) moves up and down along this edge as per the requirement. The velocity data, as captured by said anemometers (1 & 2) riding on said slider (4), is further downloaded and analyzed using the proprietary software developed by BHEL to calculate the coefficient of variation.
BRIEF DESCRIPTION OF DRAWNGS
The proposed invention will be better understood by the following description with reference to the accompanying drawings:
Figure 1 discloses the typical ESP System
Figure 2 discloses system for conducting the Gas Distribution Test in ESP according to the present invention
Figure 3 discloses system for conducting the Gas Distribution Test in ESP according to the present invention
Figure 4 discloses Flow Diagram of operation
DETAIL DESCRIPTION OF THE INVENTION
The present invention is described in detail below.
Referring to Fig. 2, a system according to the present invention is disclosed. The system comprises of a vertical moving slider(4). Said vertical moving slider (4) travel in a pre-programmed vertical direction with the help of servo/stepper motors (6), gripper wheels (3) and an anti-sliding mechanism, a braking system to avoid slipping down of said slider (4)
Said vertical moving slider (4) carries a set of two anemometers (1 & 2). Said anemometers (1 & 2) capture the air velocity readings at every 800 mm grid points and the velocity data will be stored in local memory in a prescribed format. The vertical movement of said slider (4) is supported by a collecting electrode profile (5) (G- profile as shown in fig. 2 & 3) moves up and down along this edge as per the requirement.
The velocity data, as captured by said anemometers (1 & 2) riding on said slider (4), is further downloaded and analyzed using the proprietary software developed by BHEL to calculate the coefficient of variation.
The features of the system according to the present invention are as follows:

• Two anemometers (1 & 2) are installed on said slider (4)
• Saidslider (4) moves up along said collecting electrode edge(G Profile) (5)
• Said slider is fitted with drive wheels and gripper wheels (7) and is attached to said collecting electrode edge (5)
• Said slider (4) crawls vertically along said collecting electrode profile (5) using said servo/stepper motors (6) which are controlled BHEL’s proprietary program
• Said motors (6) are micro controller/PLC based system which is programmed for vertical movement including data capture points through the user interface (UI)
• The microcontroller/PLC takes input from the user through an UI and accordingly generates the motion algorithm for vertical movement and for the data capturing as well.
The inputs required for the Microcontroller/ PLC are:
• Width of ESP
• Height of ESP
• Vertical distance between two measuring points
• Based on the inputs, the UI automatically calculates and displaysnumber of measurement points in one column and total number of points.
• Based on the above information the program for the microcontroller/ PLC generates and transfers the same through USB cable/HMI.
• The system is such that it automatically records the velocity data at every 800mm (not fixed) and stores the same into a local memory in a .csv file/.txt file
• The movement of the motors and the recording of the velocity data is also controlled through a manually operated hand held pendant (plug and play type-in case necessary).
• A position feedback system is provided to determine whether the slider is at its desired location or not.
• After powering on the system the vertical slider will be placed /attached to the electrode at a prescribed location based on the data collection points.
• After taking all the reading the stored velocity data (csv file) will be imported to the proprietary software developed by BHEL through serial communication.
The invention has been described in an illustrative manner, and it is to be understood that the terminology that has been used is intended to be in the nature of words of description rather than of limitation. Obviously, many modifications and variations of the present invention are possible in light of the above teachings. It is therefore to be understood that within the specification, the reference numerals are merely for convenience, and are not to be in any way limiting, the invention may be practiced otherwise than is specifically described.