FIELD OF THE INVENTION
The present invention generally relates to combustion of LPG in industrial
burners with high burning efficiency and high flame stability. More
particularly, the invention relates to an Arc type liquid petroleum gas (LPG)
fuel burner to enhance performance of the LPG Burner in terms of high
burning efficiency and high flame stability.
BACKGROUND OF THE INVENTION
Increasing demand of LPG for industrial purpose has become major concern
day by day. In order to reduce the consumption of LPG and ensure effective
utilization of the gas, various design of burners are known to have been
developed which have better fuel efficiency. In general composition of LPG
includes Propane or Butane or mixture of both. LPG has a very high calorific
value of 11800 kcal/kg. Therefore, it needs a special burner design (lower
quantity of fuel needed to be fired for the thermal output required when
compared to other gases).
Burner design is one of the crucial aspect in determining the combustion
efficiency, flame stability, turndown and uniform heat distribution in industrial
applications. Enough care must be taken while designing high calorific value
fuel burners. In present days of fuel scarcity, fuel price fluctuations and
constraints like transportation delays, LPG arc burner offers many advantages
over the conventional burners in terms of Fuel consumption and increasing
the rate of heating. Installation of these kinds of burners provides great
advantages in preheating of the pipe and header joints in boilers, power
plants and steel plants.

US Pat. No.7,901,204 B2, discloses for gas/non-gaseous fuel burner in steam
cracking applications. US Pat. No.5, 351,477 describes gas and/or liquid fuel
mixing burner design for turbine engine. US Pat. No. 6,422,858 Bl, teaches a
low NOx burner with liquid and gaseous fuels in industrial applications. US
Pat. No. 0143295A1 discloses a burner for multiple fuel inlets with wide range
of heating value for cooking applications which cannot be used in heat
treatment applications. Australian patent No.2008212067, describes a dual
gas burner with gaseous fuels in which both gaseous fuels must have the
same calorific value. Chinese Pat. No. CN 201706505 U teaches a tri-fuel
burner for high calorific, low calorific and a liquid fuel fired burner, with one
air supply for all fuels which is however not applicable where only gaseous
fuels are preferred. Accordingly, the prior art fail to describe a Arc type LPG
Burner for the industrial application. The present inventors recognized that t
he known arc type burners fail to achieve an uniform distribution of heat over
the pipe surface, and thus an improved burner with arc profile type head
could be developed to provide uniform distribution of heat, less fuel
consumption, and highly flame stability. Therefore, only arc profile type
burners are suitable for these industrial applications. However, prior art does
not appear to teach preheating the pipe and header joints using arc profile
burners.
OBJECTS OF THE INVENTION
It is therefore an object of the invention to propose an Arc type liquid
petroleum gas (LPG) fuel burner to enhance performance of the LPG Burner
in terms of high burning efficiency and high flame stability.

Another object of the invention is to propose an Arc type liquid petroleum gas
(LPG) fuel burner to enhance performance of the LPG Burner in terms of high
burning efficiency and high flame stability, which can fire high calorific value
fuel without reducing the thermal power output of the burner.
A further object of the invention is to propose an Arc type liquid petroleum
gas (LPG) fuel burner is to provide operational flexibility in industrial heat
treatment applications.
SUMMARY OF THE INVENTION
Accordingly, there is provided an Arc type LPG fuel burner with high burning
efficiency, high thermal output, and high flame stability.
The fuel burner is adaptable for pre heating various size pipe headers in
industrial applications.
As a step towards achieving the objects, an Arc type LPG fuel burner has
been designed. It has many advantages when compared to prior art
combustion system such as lower fuel cost, competitive capital cost, and high
thermal efficiency and cycle time reduction in welding process.
According to the invention, the inventive burner is provided with an Arc type
burner head of 120 degree angle for even distribution of flame to the preheat
the pipe headers. A venturi mixture unit is arranged for proportionate mixing
of LPG and air to achieve the blue flame. A throat pipe is attached to the
burner head for carrying a proportionate mixer to a flame point, which
constitutes at least one 120 degree arc plate with spirally wounded stainless
steel wire which is fixed on the burner head. An Air intake assembly unit with

45 degree chamfer for drawing primary air from the atmosphere. In a
preferred embodiment, the Arc profile burner head can be concave or convex
type to suit the preheating requirements. The burner of the invention is
enabled to vary the arc angle between 120 to 150°. The length of the throat
pipe can be varied from 200 to 300 mm. The burner rating can be increased
for higher end application with selection of corresponding pipe sizing.
The operation of the present invention can be manifested in a process for pre
heating pipe headers where the burner can be fixed at any position to
facilitate the welding. Basically, the inventive Arc type LPG fuel burner
consists of a venturi type fuel inlet which intakes proportionate volume of
primary air to LPG. This combustible mixture produces two linear flames with
uniform heat distribution at the flame point where in an arc profile ribbon is
mounted in the burner head. Flame stability, increased efficiency and long
operating life are being ensured by the Stainless Steel corrugated ribbons.
These burners can be constructed in various sizes providing different flame
lengths. The unique advantage of this Arc type LPG fuel burner is, it can be
positioned on either axis producing equal thermal energy output.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
Figure 1 - shows an isometric view of Arc type LPG burner of the invention.
Figure 2 - show front & side view of the Arc burner of Figure 1
Figure 3 - shows an gas venturi Mixer for the Arc burner of Figure 1
Figure 4 r Shows an Arc type Burner head section with throat pipe of the arc
burner of Figure 1.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENT OF THE
INVENTION
Figures 1 to 4 show a detailed arrangement of an Arc type LPG fuel Burner
where Figure 1 illustrates the isometric view of the LPG Arc burner consisting
of a venturi mixer unit (4) which mixes the fuel and air proportionately, a
Brass injector (2), where high calorific value LPG is being injected, and a
Burner head (6) consisting of an arc profiled corrugated stainless steel ribbon
(7) where the flame point starts. The high velocity fuel passing through the
venturi (4) creates a vacuum which draws a proportionate quantity of primary
air to LPG fuel through an air intake assembly (3).Then the combustible
mixture passes through a throat pipe and expands in the burner head (6).
Figure 2 shows the front and side view of the Arc type burner head (6) with
the throat pipe and handle.
Figures 3 illustrate the Air - Gas venturi mixer unit (4) which is termed as LPG
Injector where LPG from the brass injector (2) injected through the Venturi
unit (4) with a high velocity creating a vacuum. This vacuum created in the
venturi unit (4) draws a sufficient volume of primary air through the air intake
assembly (3) for making the mixture combustible.
Figure 4 shows the inter connection of the Arc type Burner head (6) with the
throat pipe where a proportionate mixing of LPG and Air take place and the
mixture reaches the flame point (7) after expanding in the burner head (6).

WE CLAIM:
1. An Arc type LPG fuel burner with high burning efficiency and high
flame stability for open flame preheating in pipe headers, the burner
comprising:
An arc profile Burner head (06), a Brass injector assembly (02) where
the LPG fuel is being injected, a Venturi mixer unit (04) for
proportionate mixing of LPG and primary air, an Air intake assembly
(03) for suction of sufficient volume of primary air from atmosphere,
and an Arc profiled corrugated wire ribbon (07) which produces linear
flames with uniform heat distribution.
2. The burner as claimed in claim 1, wherein the burner head (06) is
constructed with a 120° angle for even distribution of the burner flame.
3. The burner as claimed in claim 1, wherein the arc profiled corrugated
stainless steel wire ribbon (07) constitutes at least one 120° arc plate
with spirally wounded stainless steel wire fixed on the burner head
(06).
4. The burner as claimed in any of the preceding claims, wherein the air
intake assembly (03) is configured with 45° chamfer.

5. The burner as claimed in any of the preceding claims, wherein the
burner head (06) is having one of convex and concave shape, and
wherein the burner head (06) is enabled to vary the arc angle between
120° to 150°.

ABSTRACT

The invention relates to An Arc type LPG fuel burner with high burning
efficiency and high flame stability for open flame preheating in pipe
headers, the burner comprising: An arc profile Burner head (06), a Brass
injector assembly (02) where the LPG fuel is being injected, a Venturi
mixer unit (04) for proportionate mixing of LPG and primary air, an Air
intake assembly (03) for suction of sufficient volume of primary air from
atmosphere, and an Arc profiled corrugated wire ribbon (07) which
produces linear flames with uniform heat distribution.