JP2559339B2 - Coal gasifier equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coal gasification furnace device for stably operating a coal gasification furnace in which a pressurized combustor, which is the body of a coal gasification furnace, is placed in a pressure vessel. is there.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 2, in a coal gasification furnace, a reducer (reaction tower) 5 is provided above a diffuser 4 which is upwardly connected to an L duct 3 of a pressurized combustor 2 contained in a pressure vessel 1. The structure is generally provided (as a prior art document, there is Japanese Patent Application No. 5-237882).

In this coal gasifier, a portion of the pulverized coal charged with less than the theoretical amount of air is burned in the pressurized combustor 2, and the remaining pulverized coal is gasified by the reducer 5 by the heat at that time. It is a thing.

By the way, part of the pulverized coal charged in the pressurized combustor 2 and part of the pulverized coal charged in the L duct 3 are discharged together with the produced gas as char. At that time, char may adhere to and grow on the wall of the reducer, and the char may drop off periodically.

In such a case, the dropped char is the L duct 3
There is a possibility that the gas flow is choked at the inlet of the valve, the pressure inside the pressurized combustor 2 fluctuates greatly, the fluctuation of the generated gas calorific value and the problem of water shutoff occur, and it becomes difficult to continue the operation.

[0006]

SUMMARY OF THE INVENTION Therefore, the present invention is directed to a coal gasification furnace capable of avoiding pressure fluctuations in a pressurized combustor due to periodic char drop-off resulting from char sticking growth on a reductor wall. It is intended to provide a device.

[0007]

In a coal gasifier apparatus of the present invention for solving the above problems, a pressurized combustor and an L duct connected to the combustor are put in a pressure resistant container, and a communication duct is connected to the L duct. The reducer connected via another is placed in another pressure vessel, both pressure vessels are connected by piping, the reducer is provided vertically downward, a gas passage is provided at one lower side of the reducer, and a dust hopper is provided at the lower end. It is a thing. The communication duct connected to the L duct is provided so as to be inclined upward or downward with respect to the gas flow direction.

[0008]

According to the coal gasifier apparatus of the present invention configured as described above, a part of the pulverized coal charged in the pressurized combustor and a part of the pulverized coal charged in the L duct serve as char. After exiting to the upper part through the L duct together with the produced gas, 1
After reversing by 80 degrees, the gas flow becomes a downward flow by the reducer, flows through the gas passage on the lower one side to the gas cooler, and is cooled. The char in the generated gas adheres and grows on the reductor wall, and periodically drops off.The dropped char is received by the dust hopper and recycled to the pressurized combustor, where the heat of unburned char is effectively recovered. Be seen.

As described above, even if there is a periodic drop-off resulting from the adhesion and growth of char on the reducer wall, it can be received by the dust hopper, so that there is no choking of the gas flow at the inlet of the L duct unlike the conventional case, The pressure inside the pressure combustor does not fluctuate significantly.

[0010]

EXAMPLE An example of a coal gasification furnace apparatus of the present invention will be described with reference to the drawing. As shown in FIG. 1, a coal gasification furnace 6 in which a pressurized combustor 2 is placed in a pressure vessel 1 is installed at the top of a building. Then
A communication duct 4 connected to the L duct 3 of the pressurized combustor 2 is provided with an upward (or downward) inclination with respect to the gas flow direction, and a reducer (reaction tower) 5 connected to the communication duct 4 is directed downward. The gas passage 7 is provided on one side of the lower outer periphery of the reductor 5, and the dust hopper 8 is provided at the lower end. The reducer 5 is placed in a pressure resistant container 1 ′ connected to the pressure resistant container 1 by a pipe 1 a.
The gas passage 7 is provided with a gas cooler 9 for cooling the high-temperature generated gas, a cyclone 10a as a gas refining device 10 for removing impurities contained in the generated gas, and a ceramic filter 10b, and uses the generated gas as a fuel. Turbine power generator (not necessarily power generation) 11
It is connected to the. Reference numeral 12 is a compressor for further increasing the pressure of a part of the compressed air from the compressor of the gas turbine power generator 11 to supply air to the pressurized combustor 2, and 13 is heat of the exhaust gas of the gas turbine power generator 11. It is an exhaust gas boiler to be recovered. Reference numeral 14 is a steam turbine power generator driven by steam from the exhaust gas boiler 13, and 15 is the exhaust gas boiler 1.
It is an exhaust device that discharges the exhaust gas from No. 3. Char discharge port 17 of the cutting device 16 at the lower end of the dust hopper 8
And the char discharge port 20 of the cutting device 19 at the lower end of the dust tank 18 that has received the char from the gas cooler 9, the cyclone 10a, and the ceramic filter 10b,
It is connected to a char carrying pipe 22 connected to the pressurized combustor 2, and this char carrying pipe 22 is branched from a combustion air supply pipe 21 for supplying pressurized air from the compressor 12 to the pressurized combustor 2. .

According to the coal gasification furnace apparatus of the embodiment constructed as described above, the pulverized coal charged in the pressurized combustor 2 is combusted by the compressed air from the compressor 12, and the L duct 3 is used. Similarly, the pulverized coal charged in the same is combusted, but a part of the pulverized coal is discharged as char together with the produced gas through the L duct 3 and the communication duct 4 to the upper portion, and then 180
It bends once and flows downward in the reductor 5. Then, the gas flows to the gas cooler 9 through the gas passage 7 provided on one side of the lower outer periphery and is cooled. Impurities such as char are removed from the cooled product gas by the cyclone 10a and the ceramic filter 10b. The produced gas from which impurities have been removed is sent to the gas turbine power generator 11 to contribute to power generation, and the exhaust gas is sent to the exhaust gas boiler 13 to recover heat, and then exhausted to the atmosphere from the exhaust device 15. The steam generated by the heat recovery in the exhaust gas boiler 13 is sent to the steam turbine power generation device 14 to drive the device. A part of the air compressed by the compressor of the gas turbine power generator 11 is sent to the compressor 12 to further increase the pressure and then supplied to the pressurized combustor 2 as combustion air.

The char in the produced gas adheres and grows on the inner wall surface of the reductor 5 and periodically drops off. The dropped char is received by the dust hopper 8 and cut out by the cutting device 16 from the char discharge port. The compressed air from the compressor 12 is recycled to the pressurized combustor 2 through the char transport pipe 22 from the char 17, and the unburned char is burned and the amount of heat is effectively recovered. When recycling the dropped char to the pressure combustor 2, the gas cooler 9,
The char received in the dust tank 18 from the cyclone 10a and the ceramic filter 10b is also cut out by the cut-out device 19, and the char discharge port 20 through the char transport pipe 22.
Is recycled to the pressurized combustor 2.

As described above, since the dust hopper 8 can receive the periodic dropout caused by the adhesion and growth of the char on the inner wall surface of the reductor 5, the L duct 3 can be received as in the conventional case.
There is no choking of the gas flow at the inlet, and the pressure in the pressurized combustor 2 does not fluctuate significantly.

[0014]

As described above, in the coal gasification furnace apparatus of the present invention, the reductor is provided vertically downward, and the dust hopper is provided at the lower end. Even if a char falls out, it can be received by the dust hopper. Therefore, unlike the conventional case, the gas flow is not choked at the inlet of the L duct, and the pressure in the pressurized combustor does not fluctuate significantly, so that stable operation can be performed. Further, the fallen char received by the dust hopper is recycled to the pressure combustor, whereby the unburned char is burned and the amount of heat is effectively recovered.

[Brief description of drawings]

FIG. 1 is a schematic view showing an embodiment of a coal gasification furnace device of the present invention.

FIG. 2 is a schematic view showing a conventional coal gasification furnace.

[Explanation of symbols]

 1, 1'Pressure resistant container 1a Piping 2 Pressurized combustor 3 L duct 4 Communication duct 5 Reductor 6 Coal gasifier 7 Gas passage 8 Dust hopper

Claims (2)

(57) [Claims] 1. A pressure combustor and an L duct connected to the combustor are placed in a pressure resistant container, a reducer connected to the L duct via a communication duct is placed in another pressure resistant container, and both pressure resistant containers are connected by piping. Install the reducer vertically downwards,
A coal gasifier apparatus having a gas passage provided at one side of the lower portion of the reducer and a dust hopper provided at the lower end. 2. The coal gasification furnace device according to claim 1, wherein the connecting duct connected to the L duct is provided with an inclination upward or downward with respect to the gas flow direction.