FIELD OF THE INVENTION
The present invention relates to a system and method for integrated gasification
based power generation; in particular pressurized fluidized bed gasification based
systems capable of using any grade of coal. More particularly, the invention
relates to an improved liquid fuel firing gun device adaptable to pressurized
fluidized bed gasifier systems.
BACKGROUND OF THE INVENTION
Combined Cycle is increasingly being used to generate electricity through
integrated gasification. Such combined cycles are capable of using various
grades of low calorific value and high ash content coal.
In a refractory lined pressurized fluidized bed gasifier, a mixture of air and steam
is introduced through a distributor located at a bottom of the gasifier. Coal is
continuously injected to the gasifier through ejector using compressed air. Coal
gas generally called 'fuel gas' is produced due to the chemical reaction of coal
with air and stream. The fly ash and unburnt carbon particles in fuel gas are
separated by a plurality of serially disposed cyclones. The coal gas at the exit of
each of the plurality of cyclones is cooled in a Heat Recovery Boiler (HRB). The
gas is further cooled in the gas cooler while superheating the saturated steam of
HRB. A portion of the superheated steam is utilized for gasification process and
the remaining portion expands in the steam turbine to generate electricity. The
gas is further processed in a gas cleaning system and admitted to a combustion
chamber of a gas turbine to generate electricity.
In a pressurized fluidized bed gasifier, the bed-material is preheated by
igniting/burning swabs/char coal quenched with kerosene and a small quantity of
air being admitted to the bed through the distributor. To increase the
temperature of the bed, char coal is periodically added to the bed till the bed
reaches coal ignition temperature. This process takes a long period and indeed is
cumbersome.
OBJECTS OF THE INVENTION
An object of the invention is to propose an improved liquid firing gun device
adaptable to pressurized fluidized bed gasifier systems which is capable of firing
any type of liquid fuel in a burner system such that the hot gas generated can be
used to produce steam in a heat recovery boiler and/or can be used to heat the
bed of an fluidized bed boiler or gasifier.
Another object of the invention is to propose an improved liquid fuel firing gun
device adaptable to pressurized fluidized bed gasifier systems which ensures
quicker bed heating process for pressurized fluidized bed gasifier by eliminating
the problems of prior art.
A further object of the invention is to propose an improved liquid fuel firing gun
device adaptable to pressurized fluidized bed gasifier systems which is capable of
heating the bed uniformly throughout the process in pressurized fluidized bed
gasifiers.
A still further object of the invention is to propose an improved liquid fuel firing
gun device adaptable to pressurized fluidized bed gasifier systems operating at
different varying load conditions, which allows maintaining an optimum bed
heating process.
Yet another object of the invention is to propose an improved liquid fuel firing
gun device adaptable to pressurized fluidized bed gasifier systems which ensures
an environmental-friendly operation with low NOx and SOx emission.
SUMMARY OF INVENTION
An improved liquid fuel firing gun device adaptable to pressurized fluidized bed
gasifier systems for uniform and quick heating of the bed, comprising a fixed
union assembly having atleast one fixed union with at least two ports one each
for fuel oil and an atomizing medium, a guide pipe rigidly fixed with the at least
one fixed union, the guide pipe being provided with a seal air inlet nipple welded
thereon, and a clamp removably fixed with the fixed union, a screw rod screwed
into the clamp, and a plain rod welded with the screw rod; a removable union
assembly having at least one removable union with at least two ports one each
for fuel oil and the atomizing medium; at least two tubes adjoining the at least
one removable union and a nozzle body having a plurality of holes, the first of
the at least two tubes allowing flow of a pressurized fuel oil, and the second tube
accommodating a flow of the pressurized atomizing medium; an atomizing nozzle
having a plurality of holes removably attached to said nozzle body by a cap nut,
the removable union assembly detachably attached by inserting into the fixed
union assembly via the guide pipe, using a guide piece. The screw rod tightably
joins the fixed and the removable union assemblies, and in that a bolt holding a
spring is screwably inserted into the removable union being held by a lock nut
which ensures removable of the removable union assembly in course of
operation when in heated condition thereby transferring less heat to the hands of
the operator.
Primarily the liquid fuel firing gun device for bed heating system in pressurized
fluid bed gasifier comprise: a fixed means having a fixed.......................................
union, a first pipe, a seal air inlet nipple, a clamp bolted with two bolt &
nuts, a plain rod and a screw rod for tightening at least two bushes fitted
in the fixed union; and a removable means, having a removable union, a
second pipe, a 'o' ring, at least two tubes, a plurality of stiffener plates, a
guide & support plate, a nozzle body, a nozzle, and a cap nut. The device
is capable of firing the liquid fuel continuously in a burner and the product
of combustion is allowed to raise the temperature of bed-material until It
reaches the coal ignition temperature, thereby reducing the process time.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
Figure 1- Shows an elevatlonal and plan views of an improved liquid fuel
firing gun device according to the present invention.
Figure 2- Show an elevatlonal and plan view of a fixed means according
to the present Invention.
Figure 3- Shows an elevatlonal and plan view of a removal means
according to the present Invention.
DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT OF THE
INVENTION
Figure 01 shows the complete assembled elevation and plan view of a
fixed means (01) and a removable means (02). Figure 02 and Figure 03
illustrate the fixed means and the removable means of the device
respectively.
As shown in fig-2, the fixed means (1) having, a fixed union (03) with
ports for fuel oil and atomizing medium, a guide pipe (04) of diameter
varying from 80 mm to 100 mm and length varying from 500mm to
800mm being welded with the fixed union (03) for holding the removable
means (02), a small seal air inlet nipple (05) is welded with the guide pipe
(04), a clamp (06) is fitted with the fixed union (03) by bolts and washer
(10 & 11) respectively, a screw rod (07) is screwed into the clamp (06)
and a plain rod (08) is welded with the screw rod (07) for tightening the
removable means (02) with the fixed union (3), two numbers of guide
pins (09) are tightly fitted in the fixed union (03) and two numbers of
metal clad gaskets (12) are inserted into the guide plns(09) to avoid
leakage of fuel oil and atomizing medium.
The removable means (figure 03) having, a removable union (13) with
ports for fuel oil and atomizing medium, a second pipe (14) for holding an
'0' ring (15) being welded in the removable union (13), a first tube (16)
whose one end is welded with the removable union (13) and the other
end is welded with a nozzle body (20) through which the liquid fuel is
flowing with a required pressure, a second tube (17) whose one end is
welded with the removable union (13) and the other end is welded with
the nozzle body (20) through which an atomizing medium for example,
steam or compressed air at a constant pressure is supplied to atomize the
fuel, a plurality of stiffener plates (18) having thickness t)etween 5 mm to
12 mm are welded with the first and second tubes (16, 17) at different
intervals to configure identical gaps between the tubes (16,17) which
further act as reinforcement to the tubes (16,17), a guide piece (19)
having thickness of 5 mm to 12 mm is welded with the tube (17) at a
predetermined distance from the removable union (13) to guide the
removable union (13) while inserting Into the fixed union (03), the nozzle
body (20) having holes for fuel oil and atomizing medium is welded with
the tubes (16,17), an atomizing nozzle (21) having a plurality of holes
through which the fuel oil is atomized or sprayed, is attached with the
nozzle body (20) by a cap nut (22), a bolt (23) holding a spring (24) is
screwed tightly into the removable union (13) by a lock nut (25), the
spring (24) helps to remove the heated removable means (02) by
transferring less heat to the hands of the operator white the system is in
operation.
The gaskets (10) are inserted into the guide pins (09) to avoid leakage of
fuel oil and atomizing medium.
The device is capable of firing the liquid fuel effectively and continuously
in a burner and the product of combustion Is allowed to raise the
temperature of bed-material until it reaches the coal igrntion temperature,
there by It reduces the process time.
The removable union (13) having ports for fuel oil and atomizing medium,
the first tube (16), the second tube (17), the second pipe (14) for holding
the '0' ring (15) for arresting the flue gas from the burner. The spring
(24) is inserted in the bolt (23) and the bolt is screwed into the removable
union (13) and locked by the lock nut (25), which arrangement provides
easy handling of the removable union (13).
The device by means of the nozzle body (20), the atomizing nozzle (21)
and the cap nut (22) is capable of firing the fuel oil perpendicular to the
gun axis and also provides lengthy flame with smaller diameter.
The device is capable of firing any high or low viscosity liquid fuels
effectively and continuously In a combustion system with steam/electrical
heating arrangement.
WE CLAIM
1. An improved liquid fuel firing gun device adaptable to pressurized fluidized
bed gasifier systems for uniform and quick heating of the bed, comprising:
- a fixed union.assembly (01) having atleast one fixed union (03) with at
least two ports one each for fuel oil and an atomizing medium, a guide
pipe (04) rigidly fixed with the at least one fixed union (03), the guide
pipe (04) being provided with a seal air inlet nipple (05) welded thereon,
and a damp (06) removably fixed with the fixed union (03);
a screw rod (07) screwed into the clamp (06), and a plain rod (08)
welded with the screw rod (07);
- a removable union assembly (02) having at least one removable union
(13) with at least two ports one each for fuel oil and the atomizing
medium; at least two tubes (16, 17) adjoining the at least one removable
union (13) and a nozzle body (20) having a plurality of holes, the first (16)
of the at least two tubes (16, 17) allowing flow of a pressurized fuel oil,

and the second tube (17) accommodating a flow of the pressurized
atomizing medium;
- an atomizing nozzle (21) having a plurality of holes removably
attached to said nozzle body (20) by a cap nut (22),
the removable union assembly (02) detatchably attached by inserting into the
fixed union assembly (01) via the guide pipe (04), using a guide piece (19),
characterized in that the screw rod (07) tightably joins the fixed and the
removable union assemblies (01,02), and in that a bolt (23) holding a spring (24)
is screwably inserted into the removable union (13) being held by a lock nut (25)
which ensures removal of the removable union assembly (02) in course of
operation when in heated condition thereby transferring less heat to the hands of
the operator.
2. The device as claimed in claim 1, wherein the clamp (06) is rigidly fixed with
the fixed union (03) by bolts and washers (11,12).
3. The device as claimed in claim 1 or 2, wherein at least two gaskets (10) are
inserted into the guide pins (09).

4. The device as claimed in claim 1, wherein a second pipe (14) for holding an
'0' ring (15) is rigidly attached to the removable union (13).
5. The device as claimed in any one of the preceding claims, wherein a plurality
of stiffener plates (18) are rigidly joined on the first and the second tubes
(16,17) at pre-determined intervals to configure identical gaps between the
tubes (16,17) and wherein the plurality of stiffener plates (18) act as
reinforcement members to the tubes (16,17).
6. An improved liquid fuel firing gun device adaptable to fluidized bed gasifier
systems for uniform and quick heating of the bed as substantially described
herein with reference to the accompanying drawings.

The device ensures uniform and quick heating of the bed, and comprising; a
fixed union assembly (01) having at least one fixed union (03) with at least two
ports one each for fuel oil and an atomizing medium, a first guide pipe (04), and
a screw rod (07) for attaching a removable union (13) of a removable union
assembly (02), with the fixed union (03). The removable union (13) has at least
two ports one each for fuel oil and the atomizing medium; at least two tubes
(16, 17) adjoining the at least one removable union (13) and a nozzle body (20),
The first of the at least two tubes (16) allowing a flow of a pressurized fuel, and
the second tube (17) accommodating a flow of the pressurized atomizing
medium; an atomizing nozzle (21) removably attached to said nozzle body. The
fixed union assembly (01) and the removable union assembly (02) are
detachably attached by inserting the removable union (13) into the fixed union
(03) via a guide piece (19). A bolt (23) holding a spring (24) is screwably
inserted into the removable union (13) being held by a lock nut (25) which
ensures removable of the removable union assembly (02).