CN117844537A - Ground coal gasifier lime-ash continuous conveying processing system - Google Patents
Ground coal gasifier lime-ash continuous conveying processing system Download PDFInfo
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- CN117844537A CN117844537A CN202211207545.0A CN202211207545A CN117844537A CN 117844537 A CN117844537 A CN 117844537A CN 202211207545 A CN202211207545 A CN 202211207545A CN 117844537 A CN117844537 A CN 117844537A
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- ash
- pipeline
- slag
- underground
- tank
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- 239000003245 coal Substances 0.000 title claims abstract description 23
- 238000002309 gasification Methods 0.000 claims abstract description 53
- 230000001105 regulatory effect Effects 0.000 claims abstract description 35
- 239000002893 slag Substances 0.000 claims abstract description 30
- 238000002485 combustion reaction Methods 0.000 claims abstract description 12
- 230000000087 stabilizing effect Effects 0.000 claims description 32
- 239000007789 gas Substances 0.000 claims description 22
- 239000003795 chemical substances by application Substances 0.000 claims description 13
- 239000007787 solid Substances 0.000 claims description 12
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 8
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 8
- 238000007789 sealing Methods 0.000 claims description 6
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 4
- 239000001569 carbon dioxide Substances 0.000 claims description 4
- JCXJVPUVTGWSNB-UHFFFAOYSA-N nitrogen dioxide Inorganic materials O=[N]=O JCXJVPUVTGWSNB-UHFFFAOYSA-N 0.000 claims description 2
- 238000006243 chemical reaction Methods 0.000 abstract description 20
- 238000000034 method Methods 0.000 abstract description 12
- 239000008247 solid mixture Substances 0.000 abstract description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 8
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 230000002950 deficient Effects 0.000 abstract description 3
- 239000000463 material Substances 0.000 description 6
- 230000000295 complement effect Effects 0.000 description 3
- 230000002349 favourable effect Effects 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
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- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a continuous conveying treatment system for ash and slag of an overground coal gasifier, which comprises an ash and slag tank, an ash and slag pipeline, an underground gasifier and a pneumatic conveying device; a feeding regulating valve is arranged on a feeding hole of the ash tank; an ash pipeline is arranged on a discharge hole of the ash tank, the top end of the ash pipeline penetrates through an air inlet hole of the underground gasification furnace and is arranged in a combustion space area of the underground gasification furnace, and a compressed air pipe of the pneumatic conveying device is communicated with the ash pipeline. The advantages are that: the ash slag generated by the overground gasification process can be continuously filled into the combustion space area of the underground gasification furnace, so that the problems of storage and treatment of the ash slag are solved, and the stability of the underground gasification reaction intensity and gasification efficiency is ensured; the underground part of the ash conveying pipeline is arranged in the air inlet hole of the underground gasification furnace, so that the phenomenon that the gas-solid mixture in the ash conveying pipeline is separated out of water to influence the smooth flow of the gas-solid mixture is avoided, and meanwhile, steam enters the underground gasification furnace to be beneficial to the underground gasification reaction in a water-deficient area.
Description
Technical field:
the invention belongs to the technical field of coal gasification, and particularly relates to a continuous conveying treatment system for ash residues of an overground coal gasification furnace.
The background technology is as follows:
the coal gasification process is classified into an overground coal gasification process and an underground coal gasification process according to gasification positions, and is a process of converting solid coal into products such as gaseous synthesis gas, tar, ash and the like through gasification reaction. Ash generated by the overground gasification process is transported to a slag yard for storage, and is not friendly to the environment in the transportation and storage processes; the underground coal gasification is gradually consumed along with the gradual progress of the reaction, so that the reaction area of the underground gasification furnace is gradually increased, and the gasification reaction intensity and the gasification efficiency are gradually reduced.
The invention comprises the following steps:
aiming at the problems, the invention aims to provide a continuous conveying treatment system for ash of an overground coal gasifier, which is used for conveying ash generated by the overground gasification process to an underground gasifier, so that the problems of storage and treatment of the ash generated by the overground gasification process are solved, and the problem of the increase of a reaction zone of the underground gasifier is also solved.
The invention is implemented by the following technical scheme: a continuous conveying treatment system for ash of an overground coal gasifier comprises an ash tank, an ash pipeline, an underground gasifier and a pneumatic conveying device; a feeding regulating valve is arranged on a feeding hole of the ash slag tank; the ash residue pipeline is arranged on the discharge hole of the ash residue tank, the top end of the ash residue pipeline penetrates through the air inlet hole of the underground gasification furnace and is arranged in the combustion space area of the underground gasification furnace, and the compressed air pipe of the pneumatic conveying device is communicated with the ash residue pipeline.
The pneumatic conveying device is used for conveying ash residues by gas, so that abrasion of the ash residues to ash residue pipelines is reduced, and long-distance conveying of the ash residues is facilitated; the gas required by the reaction of the underground gasifier is adopted as the conveying gas of the pneumatic conveying device, so that the pneumatic conveying device can not only convey ash to the combustion space, but also convey the gas participating in the gasification reaction to the underground gasifier.
Preferably, a discharge stop valve is arranged on a discharge port of the ash tank.
The discharge stop valve can cut off the ash and slag discharge of the ash and slag tank.
Preferably, the device also comprises a voltage stabilizing device; the pressure stabilizing device comprises a pressure stabilizing air source and a pressure stabilizing self-operated regulating valve, wherein the pressure stabilizing air source is communicated with the ash tank through a pipeline, and the pressure stabilizing self-operated regulating valve is arranged on the pipeline between the pressure stabilizing air source and the ash tank.
The pressure stabilizing device can keep the pressure in the ash slag tank relatively stable in the process that ash slag flows out of the ash slag tank, and the selected pressure stabilizing gas is gas which does not react with ash slag or coal or can react with coal to generate substances for promoting the reaction of the underground gasification furnace.
Preferably, the pressure stabilizing gas of the pressure stabilizing gas source is any one or combination of nitrogen and carbon dioxide.
Preferably, the included angle between the compressed air pipe and the ash pipeline is smaller than the complementary angle of the ash repose angle.
The included angle between the compressed air tank and the ash pipeline is smaller than the complementary angle of the ash repose angle, which is favorable for conveying air to flow ash in the downstream direction, reduces the air quantity of conveying air, and simultaneously avoids ash gathering on the pipeline of the compressed air pipe after abnormal condition backflow occurs.
Preferably, a gas-solid regulating valve is arranged on the ash residue pipeline between the compressed air pipe and the orifice of the air inlet hole, and the gas-solid regulating valve is controlled in an interlocking way with the feeding regulating valve.
The gas-solid regulating valve can control the ash quantity of ash in the ash tank flowing into the underground gasifier, the feeding regulating valve can control the ash quantity flowing into the ash tank, and the material level in the ash tank can be kept relatively constant by the cooperation of the gas-solid regulating valve and the feeding regulating valve, so that the operation of operators is facilitated.
Preferably, the hole opening of the air inlet hole is arranged in a sealing way, the top end of the ash slag pipeline passes through the hole opening of the air inlet hole in a sealing way, and the gasifying agent pipeline of the underground gasifier is communicated with the air inlet hole.
The underground part of the ash pipeline is arranged in the air inlet hole, so that the gas-solid mixture flowing in the ash pipeline is prevented from being subjected to cold-heat exchange with the cold medium outside the pipe to separate out water, the smooth flow of the gas-solid mixture in the ash pipeline is influenced, meanwhile, the gas-solid mixture is not subjected to cold-heat exchange with the cold medium, the temperature of the gas-solid mixture is not reduced, the influence on the temperature in the underground gasification furnace is small, and the gasification reaction of underground gasification is facilitated.
The invention has the advantages that: 1. by utilizing the system, ash slag generated by an overground gasification process can be continuously filled into the combustion space of the underground gasification furnace, so that the problems of storage and treatment of the ash slag are solved, the space stability of the gasification reaction zone of the underground gasification furnace is ensured, and the stability of the underground gasification reaction intensity and the gasification efficiency is further ensured; 2. the gas required by the underground gasification reaction is used as the conveying gas of the ash, so that the ash can smoothly enter the combustion space area, and the conveyed gas medium can participate in the gasification reaction; 3. the underground part of the ash conveying pipeline is arranged in the air inlet hole of the underground gasification furnace, so that the water precipitation of the gas-solid mixture in the pipe caused by heat exchange between the gas-solid mixture in the ash conveying pipeline and the cold medium outside the pipe is effectively avoided, the smooth flow of the gas-solid mixture is affected, and meanwhile, steam enters the underground gasification furnace, thereby being beneficial to the underground gasification reaction in the water-deficient area.
Description of the drawings:
in order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1: schematic system connection of example 1;
in the figure: 1. the device comprises an ash slag tank, 2 ash slag pipelines, 3, an underground gasifier, 4, a pneumatic conveying device, 5, a pressure stabilizing device, 6, a feeding regulating valve, 7, a discharge stop valve, 8, an air inlet hole, 9, a combustion space area, 10, a gasifying agent pipeline, 11, a compressed air pipe, 12, a gas-solid regulating valve, 13, a pressure stabilizing air source, 14, a pressure stabilizing self-operated regulating valve, 15 and a gasifying agent regulating valve.
The specific embodiment is as follows:
the principles and features of the present invention are described below with examples given for the purpose of illustration only and are not intended to limit the scope of the invention.
Example 1:
as shown in figure 1, the ground coal gasifier ash continuous conveying treatment system comprises an ash tank 1, an ash pipeline 2, an underground gasifier 3, a pneumatic conveying device 4 and a pressure stabilizing device 5; the feeding port of the ash tank 1 is provided with a feeding regulating valve 6, the feeding regulating valve 6 ensures that the material level of the ash tank 1 is kept in a preset interval, the lower limit value of the material level in the ash tank 1 is higher than the bottommost part of the ash tank 1, and the upper limit value of the material level in the ash tank 1 cannot influence the opening of the feeding regulating valve 6. When the material level in the ash tank 1 is detected to be close to the lower limit value of the preset value interval, the feeding regulating valve 6 is opened to start feeding, at the moment, the pressure of ash supplying equipment connected with the feeding regulating valve 6 and the ash tank 1 is ensured to be consistent, and when the material level in the ash tank 1 is detected to reach the upper limit value, the feeding regulating valve 6 is closed to stop feeding. A discharge stop valve 7 is arranged on a discharge port of the ash tank 1; the ash tank 1 is also provided with an ash pipeline 2 at the discharge port, the top end of the ash pipeline 2 passes through an air inlet 8 of the underground gasifier 3 and is arranged in a combustion space area 9 of the underground gasifier 3, the orifice of the air inlet 8 is arranged in a sealing way, the top end of the ash pipeline 2 passes through the orifice of the air inlet 8 in a sealing way, a gasifying agent pipeline 10 of the underground gasifier 3 is communicated with the air inlet 8, and a gasifying agent regulating valve 15 is arranged on the gasifying agent pipeline 10 and is used for regulating the amount of gasifying agent entering the underground gasifier 3. The gasifying agent is superheated steam, and the temperature of the superheated steam is higher than the temperature at which the gas-solid mixture in the ash pipeline 2 reaches the combustion space 9 without water precipitation and is not lower than the maximum value of the saturated steam temperature of the superheated steam under the pressure of the outlet of the air inlet hole 8. Thus, the superheated steam is still steam when entering the underground gasification furnace 3, which is beneficial to the gasification reaction of the water-deficient underground gasification furnace 3.
The compressed air pipe 11 of the pneumatic conveying device 4 is communicated with the ash pipeline 2, and the included angle between the compressed air pipe 11 and the ash pipeline is smaller than the remaining angle of the ash repose angle. The ash pipeline 2 between the compressed air pipe 11 and the orifice of the air inlet 8 is provided with a gas-solid regulating valve 12, and the gas-solid regulating valve 12 is controlled in an interlocking way with the feeding regulating valve 6. The ash is conveyed by the pneumatic conveying device 4 through gas, so that the abrasion of the ash to the ash pipeline 2 is reduced, the conveying gas of the pneumatic conveying device 4 adopts carbon dioxide, the carbon dioxide can react with coal in the underground gasification furnace 3 to generate gas carbon monoxide which is favorable for gasification reaction of the underground gasification furnace 3, and the pneumatic conveying device 4 can convey the ash to the combustion space 9 and can convey the gas participating in gasification reaction to the underground gasification furnace 3. The included angle between the compressed air tank and the ash pipeline 2 is smaller than the complementary angle of the ash repose angle, which is favorable for conveying air to flow ash in the same direction, reducing the air quantity of conveying air, and avoiding ash gathering on the pipeline of the compressed air pipe 11 after abnormal condition backflow.
The pressure stabilizing device 5 comprises a pressure stabilizing air source 13 and a pressure stabilizing self-operated regulating valve 14, wherein the pressure stabilizing air source 13 is communicated with the ash tank 1 through a pipeline, the pressure stabilizing self-operated regulating valve 14 is arranged on the pipeline between the pressure stabilizing air source 13 and the ash tank 1, and the pressure stabilizing air of the pressure stabilizing air source 13 is nitrogen. The pressure stabilizing device 5 can keep the pressure in the ash tank 1 relatively stable in the process that ash flows out of the ash tank 1, nitrogen does not react with ash chemically, nitrogen is selected as pressure stabilizing gas, the components of the ash cannot be changed, and the reaction of the underground gasification furnace 3 is not influenced.
The working description:
opening a valve of the pneumatic conveying device 4 and a gas-solid regulating valve 12, and conveying ash slag into a combustion space 9 of the underground gasification furnace 3 through an ash slag pipeline 2 by using conveying gas; the pressure at the outlet of the ash pipe 2 is made to be 100-500kPa higher than the pressure at the outlet of the gasifying agent pipe 10 by adjusting the gas-solid adjusting valve 12, and the ratio of the ash conveying amount to the gas amount of the conveying gas is made to be 10-30kg/m 3 In the range, when the gas-solid mixture in the ash pipeline 2 and the gasifying agent in the gasifying agent pipeline 10 reach the outlet, the gas-solid mixture is not separated out of water, and the gasifying agent is still in a steam state.
The foregoing description of the preferred embodiments of the present invention is not intended to be limiting, but rather, any modifications, equivalents, improvements, etc. that fall within the spirit and scope of the present invention are intended to be included within the scope of the present invention.
Claims (7)
1. The continuous conveying treatment system for the ash of the overground coal gasifier is characterized by comprising an ash tank, an ash pipeline, an underground gasifier and a pneumatic conveying device; a feeding regulating valve is arranged on a feeding hole of the ash slag tank; the ash residue pipeline is arranged on the discharge hole of the ash residue tank, the top end of the ash residue pipeline penetrates through the air inlet hole of the underground gasification furnace and is arranged in the combustion space area of the underground gasification furnace, and the compressed air pipe of the pneumatic conveying device is communicated with the ash residue pipeline.
2. The continuous conveying and processing system for ash and slag of an overground coal gasifier according to claim 1, wherein a discharge stop valve is arranged on a discharge port of the ash and slag tank.
3. The continuous conveying and processing system for ash and slag of an overground coal gasifier according to claim 2, further comprising a pressure stabilizing device; the pressure stabilizing device comprises a pressure stabilizing air source and a pressure stabilizing self-operated regulating valve, wherein the pressure stabilizing air source is communicated with the ash tank through a pipeline, and the pressure stabilizing self-operated regulating valve is arranged on the pipeline between the pressure stabilizing air source and the ash tank.
4. The continuous conveying and treating system for ash and slag of overground coal gasifier according to claim 3, wherein the pressure-stabilizing gas of the pressure-stabilizing gas source is any one or combination of nitrogen and carbon dioxide.
5. The continuous conveying and processing system for ash and slag of an above-ground coal gasifier according to claim 1, wherein the included angle between the compressed air pipe and the ash pipe is smaller than the remaining angle of the ash repose angle.
6. The continuous conveying and treating system for ash and slag of overground coal gasifier according to claim 1, wherein a gas-solid regulating valve is arranged on the ash and slag pipeline between the compressed air pipe and the orifice of the air inlet hole, and the gas-solid regulating valve is controlled in an interlocking manner with the feeding regulating valve.
7. The continuous conveying and treating system for ash and slag of an overground coal gasifier according to claim 1, wherein the orifice of the air inlet hole is arranged in a sealing manner, the top end of the ash and slag pipeline passes through the orifice of the air inlet hole in a sealing manner, and the gasifying agent pipeline of the underground gasifier is communicated with the air inlet hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211207545.0A CN117844537A (en) | 2022-09-30 | 2022-09-30 | Ground coal gasifier lime-ash continuous conveying processing system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211207545.0A CN117844537A (en) | 2022-09-30 | 2022-09-30 | Ground coal gasifier lime-ash continuous conveying processing system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117844537A true CN117844537A (en) | 2024-04-09 |
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ID=90538606
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211207545.0A Pending CN117844537A (en) | 2022-09-30 | 2022-09-30 | Ground coal gasifier lime-ash continuous conveying processing system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117844537A (en) |
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2022
- 2022-09-30 CN CN202211207545.0A patent/CN117844537A/en active Pending
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