AU2007343509B2

AU2007343509B2 - A dry coal powder gasification furnace

Info

Publication number: AU2007343509B2
Application number: AU2007343509A
Authority: AU
Inventors: Jiule Zhou
Original assignee: Individual
Current assignee: Individual
Priority date: 2006-12-28
Filing date: 2007-12-19
Publication date: 2011-10-06
Anticipated expiration: 2027-12-19
Also published as: DE112007003155T5; JP2010514858A; AU2007343509A1; US20100018117A1; WO2008083574A1

Abstract

A dry coal powder gasification furnace comprises a furnace body. The furnace body consists of a gasification furnace body for hot and dirty coal gas (1) and a hot and dirty coal gas reforming and cleaning furnace body (2). There is a gasification chamber (3) in the upper part of the gasification furnace body (1) and a settling chamber (4) in the lower part of the gasification furnace body (1). There are multiple coal powder nozzles (9) at the upper part of the gasification furnace body (1). One ends of the multiple coal powder nozzles (9) are connected to the gasification chamber (3) and another ones are connected to a coal-spraying pipe (8). The coal-spraying pipe (8) is connected to a screw feeder (7). The screw feeder (7) is mounted below a loading lock hopper (6). Multiple gas nozzles (10) connected to the gasification chamber (3) are mounted on the upper part of the gasification furnace body (1) and below the coal powder nozzles (9). Multiple regulating gasification nozzles (11) connected to the gasification chamber (3) are mounted on the middle part of the gasification furnace body (1) and below the multiple gas nozzles (10). Multiple cool nozzles (12) connected to the settling chamber (4) are provided on the lower part of the gasification furnace body (1). Water-cooled walls (13) are provided in the settling chamber (4). A water-cooling grate (19) is mounted in the middle part of the reforming and cleaning furnace body (2). The fluidized bed gasification furnace with the nozzles is simple in structure and reliable in operation. The compositions of the produced coal gas can be easily controlled and the high-pressure coal gas produced can be directly supplied to users.

Description

1 A Dry Pulverized-coal Gasification Furnace Field of Art This present invention is relating to a gas making device, especially a new type dry pulverized-coal gasification furnace. 5 Background Art In the metallurgy and chemical industries, the comprehensive utilization of clean coal, gasification of coal and production of high heating value and high hydrogen gas are applied widely. This invention provides an embodiment for the previous application of Preparing Method of High-pressure and High-hydrogen 10 Gas (Application No.: 200620189536.6). Description of Invention The purpose of this invention is to provide a pulverized-coal gasification furnace which can achieve the high-pressure and high-hydrogen gas. The technical solution is adopted as follows: 15 A dry pulverized-coal gasification furnace, wherein the furnace body comprises the hot-dirty gas vaporizing furnace body and hot-dirty gas reforming and purifying furnace body. The said hot-dirty gas vaporizing furnace body is provided with the vaporizing chamber at the upper part and the settling chamber at the lower part. A plurality of pulverized-coal nozzles are provided at the upper part 20 of the said hot-dirty gas vaporizing furnace body, and linked with the said vaporizing chamber at one end and connected with a coal jetting pipe at the other end. The said coal jetting pipe is connected with a spiral feeder, which is at the bottom of the feeding lock hopper. The upper part of the hot-dirty gas vaporizing furnace body is at the lower part of the pulverized-coal nozzle, and a plurality of 2 nozzles are linked with the said vaporizing chamber. The middle part of the said hot-dirty gas vaporizing furnace body is at the lower part of a plurality of nozzles, and a plurality of gas adjusting nozzles connected with the said vaporizing chamber are provided. At the lower part of the said hot-dirty gas vaporizing 5 furnace body, a plurality of cool-down nozzles connected with the said settling chamber are provided. In the said settling chamber, the water screen is provided. At the lower part of the said vaporizing chamber, it is connected and linked with the said hot-dirty gas reforming and purifying furnace through the path. A gas outlet is provided at the upper part of the said hot-dirty gas reforming and purifying 10 furnace, a bell provided at the top, a plurality of cool-down nozzles provided at the lower part, a discharging lock hopper provided at the bottom and a water-cooling furnace grate installed in the middle of the said hot-dirty gas vaporizing furnace body. A plurality of air nozzles, gas adjusting nozzles and cool-down nozzles are 15 inclined upwards and inserted to the hot-dirty gas vaporizing furnace body. The main advantages of this invention are as follows: 1. It is fluidized and its nozzles are simple, manufacturable and reliable. 2. The high-temperature steam, air or oxygen can directly make the gas producing reaction without any igniting apparatus. 20 3. It increases the content of hydrogen in the gas and lowers the consumption of pure oxygen. 4. It is operable and the content of gas is controllable.

3 5. The water-cooling slag is vaporized and solidified at low temperature without any waste water. At the meanwhile, it can take the waste heat of slag to re-make high-temperature steam. 6. The gas desulphurization process is easy with high efficiency of 5 desulphurization and dust removal. 7. It can directly make the high-pressure gas for uses without any pressurizing unit. Description of Figures Fig 1 is the structure view of this invention. 10 Specific Method for Implementation As shown in Fig 1, a pulverized-coal gasification furnace, comprises the hot-dirty gas vaporizing furnace body 1 and the hot-dirty gas reforming and purifying furnace body 2. The said hot-dirty gas vaporizing furnace body 1 is a high-temperature fluidized furnace. For liquifization, it adopts the mode of compact 15 multi-nozzle side spray at the top, and for gasification, it adopts the way of upward blow of the steam, oxygen or high-temperature air. At the upper part of the hot dirty gas vaporizing furnace body 1, the vaporizing chamber 3 is provided, with the fire-resistant furnace linear and the thermal insulation external lining. At the lower part of the said hot-dirty gas vaporizing furnace body 1, the settling chamber 4 is 20 provided with the water-screen linear. At the lower part of the gasification chamber 1, the path 5 is connected with the hot-dirty reforming and purifying furnace body 2, which takes the fire-resistant material as the furnace linear and take the heat insulation material as the external lining. The gas is discharged from the top of the hot-dirty gas reforming and purifying furnace body 2. At the upper part of the hot- 4 dirty gas vaporizing furnace body 1, a plurality of gas nozzles 9 are provided, connected and linked with a coal injecting pipe 8. Above the hot-dirty gas vaporizing furnace body 1 and below the gas nozzle 9, a plurality of air nozzles 10 are inclined upwards and connected with the gasification chamber 3. In the middle 5 of the hot-dirty gas vaporizing furnace body 1 and below the air nozzle 10, a plurality of gas adjusting nozzles 11 are inclined upwards and connected with the gasification chamber 3. After the dry coal is crushed by the coal grinding machine, it is transferred to the feeding lock hopper 6, then to the coal injecting pipe 8 through a spiral feeder 7, then the high-temperature steam is provided through the 10 coal injecting pipe 8. With the steam, the coal dust is injected to the gasification chamber 3 through the gas nozzle 9. The steam is preheated by the high efficiency steam preheater and the air is preheated by the high-efficiency fan heater. The high-temperature (or oxygen) and water vapor after preheating are injected to the gasification chamber 3 through the nozzle 10 below the coal 15 injecting pipe 8, then the coal dust is blown and mixed fully in the gasification chamber 3 by the high-temperature steam and air injected by the air nozzle 10. The gas adjusting nozzle 11 can provide the high-temperature air (or oxygen) to the furnace, to adjust the gasification reagent. The crude coal produced, through the path, enters the hot-dirty gas reforming and purifying furnace body 2. The ash 20 in the crude gas, through gravity settling, enters the settling chamber 4. At the lower part of the said settling chamber, a plurality of cool-down nozzles 12, which gives the low-temperature steam, are provided. In the settling chamber 4, the water screen 13 is provided. At the bottom of the settling chamber 4, the waste outlet 14 is provided. At the waste outlet, the discharging lock hopper 15 is 5 provided. The ash becomes solid through the water screen 13. After solidifying, the ash is discharged by the discharging lock hopper 15, and the crude gas enters the hot-dirty gas reforming and purifying furnace body 2 through the path 5. In the middle of the hot-dirty gas reforming and purifying furnace body 2, the water 5 cooling furnace grate 19 is provided. At the top of the hot-dirty gas reforming and purifying furnace body 2, the bell 16 is provided. The outlet 20 is provided at the upper part of the said furnace body. A specific content of coke mixed with some lime is provided to the said furnace through the said bell 16. After the crude gas goes through the coke layer and reduction layer, the un-reacted vapor in the crude 10 gas can be decomposed of hydrogen and carbon monoxide, and some carbon dioxide can be deoxidized to carbon monoxide. The sulfureted hydrogen in the gas can be absorbed by the lime, and the deoxidized gas is discharged from the gas outlet 20 at the upper part of the hot-dirty gas reforming and purifying furnace body 2. At the bottom of the hot-dirty gas reforming and purifying furnace body 2, a 15 plurality of cool-down nozzles 17 and discharging lock hopper 18 are provided. With the low-temperature steam, the ash after reaction of coke and gas is solidified and discharged from the discharging lock hopper 18. The gas from the hot-dirty gas reforming and purifying furnace body 2 is taken back through the waste heat, and dedusted through the cloth bag. It is transferred to the medium 20 pressure tank after TRT residual pressure generation for consumption by users.

Claims

1. A dry pulverized-coal gasification furnace, wherein the furnace body comprises the hot-dirty gas vaporizing furnace body and hot-dirty gas reforming and purifying 5 furnace body; the said hot-dirty gas vaporizing furnace body is provided with the vaporizing chamber at the upper part and the settling chamber at the lower part; a plurality of pulverized-coal nozzles are provided at the upper part of the said hot dirty gas vaporizing furnace body, and linked with the said vaporizing chamber at one end and connected with a coal jetting pipe at the other end; the said coal 10 jetting pipe is connected with a spiral feeder, which is at the bottom of the feeding lock hopper; the upper part of the hot-dirty gas vaporizing furnace body is at the lower part of the pulverized-coal nozzle, and a plurality of nozzles are linked with the said vaporizing chamber; the middle part of the said hot-dirty gas vaporizing furnace body is at the lower part of a plurality of nozzles, and a plurality of gas 15 adjusting nozzles connected with the said vaporizing chamber are provided; at the lower part of the said hot-dirty gas vaporizing furnace body, a plurality of cool down nozzles connected with the said settling chamber are provided; in the said settling chamber, the water screen is provided; at the lower part of the said vaporizing chamber, it is connected and linked with the said hot-dirty gas 20 reforming and purifying furnace through the path; a gas outlet is provided at the upper part of the said hot-dirty gas reforming and purifying furnace, a bell provided at the top, a plurality of cool-down nozzles provided at the lower part, a discharging lock hopper provided at the bottom and a water-cooling furnace grate installed in the middle of the said hot-dirty gas vaporizing furnace body. 7

2. The said dry pulverized-coal gasification furnace according to Claim 1, wherein a plurality of air nozzles, gas adjusting nozzles and cool-down nozzles are inclined upwards to the hot-dirty gas vaporizing furnace body.

3. A dry pulverized coal gasifier according to Claim 1, its characteristic is the 5 fluidization hybrid method, which specifically as follows: The pulverized coal using nozzles are injected into the gasifier by high-pressure steam; a number of high temperature air (or oxygen) and steam are injected obliquely upward into the gasifier by the nozzles which are arranged under the nozzle of pulverized coal; the composition of the gas is adjustable. 10

4. A dry pulverized coal gasifier according to Claim 1, its characteristic is the application of two high-performance preheating gas in the pulverized coal gasifier, which specifically as follows: The reaction gas and steam injected into the gasifier are preheated to 1100 C-1300'C through high-performance steam preheater; the air is preheated to 1000 0 C-1200C through high-performance steam preheater. 15

5. A dry pulverized coal gasifier according to Claim 1, its characteristic is the main composition of the gas generated by the gasifier are: CO: 35-50% and H2:38-43% which contain a small amount of CH4 and N2; this gas can be used as fuel as well as raw gas used for chemical synthesis and raw gas for extraction of hydrogen gas. 20

6. A dry pulverized coal gasifier according to Claim 1, its characteristic is the hot dirty gas reforming purification gasifier body; it is not limited to this structure, but also can be used for reforming of oven raw gas.