CN218860652U - Continuous ash conveying and processing system for underground coal gasification furnace - Google Patents
Continuous ash conveying and processing system for underground coal gasification furnace Download PDFInfo
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- CN218860652U CN218860652U CN202222633640.9U CN202222633640U CN218860652U CN 218860652 U CN218860652 U CN 218860652U CN 202222633640 U CN202222633640 U CN 202222633640U CN 218860652 U CN218860652 U CN 218860652U
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Abstract
The utility model discloses an ash slag continuous conveying processing system of an underground coal gasification furnace, which comprises an ash slag tank, an ash slag pipeline, an underground gasification furnace and a pneumatic conveying device; a feed regulating valve is arranged on a feed inlet of the ash tank; an ash residue pipeline is arranged on a discharge port of the ash residue tank, the top end of the ash residue pipeline penetrates through an air inlet 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 residue pipeline. Has the advantages that: ash slag generated by the ground gasification process can be continuously filled into a combustion empty area of the underground gasification furnace, so that the problems of ash slag storage and treatment are solved, and the stability of the reaction strength and the gasification efficiency of underground gasification is ensured; the underground part of the ash residue pipeline is arranged in the air inlet hole of the underground gasification furnace, so that the gas-solid mixture in the ash residue conveying pipeline is prevented from separating out water to influence the smooth flow of the gas-solid mixture, and meanwhile, steam enters the underground gasification furnace to facilitate the underground gasification reaction in water-deficient areas.
Description
The technical field is as follows:
the utility model belongs to the technical field of coal gasification, concretely relates to processing system is carried in succession to ground coal gasifier lime-ash.
The background art comprises the following steps:
the coal gasification process is divided into an aboveground coal gasification process and an underground coal gasification process according to gasification positions, and is a process of converting solid coal into gaseous synthesis gas, tar, ash and other products through gasification reaction. Ash slag generated by the above-ground gasification process is transported to a slag field for storage, and is not environment-friendly in the transportation and storage processes; along with the gradual progress of the reaction of underground coal gasification, the coal in the reaction area can be gradually consumed, 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 utility model has the following contents:
to above problem, the utility model aims to provide an underground coal gasifier lime-ash is carried processing system in succession will be carried the lime-ash that the gasification technology produced to the underground gasifier on the ground, has both solved the storage and the processing difficult problem of the lime-ash that the gasification technology produced on the ground, has solved the problem of underground gasifier reaction zone increase again.
The utility model discloses by following technical scheme implement: an ash continuous conveying treatment system of an underground coal gasification furnace comprises an ash tank, an ash pipeline, an underground gasification furnace and a pneumatic conveying device; a feeding regulating valve is arranged on a feeding hole of the ash tank; the ash residue pipeline is arranged on a discharge hole of the ash residue tank, the top end of the ash residue 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 residue pipeline.
The ash is conveyed by gas through the pneumatic conveying device, so that the abrasion of the ash to an ash pipeline is reduced, and the long-distance conveying of the ash is facilitated; the conveying gas of the pneumatic conveying device adopts the gas required by the reaction of the underground gasification furnace, so that the pneumatic conveying device can convey the ash slag to the combustion space area and can convey the gas participating in the gasification reaction to the underground gasification furnace.
Preferably, a discharge stop valve is arranged at a discharge hole of the ash tank.
The discharge stop valve can cut off the ash discharge of the ash tank.
Preferably, the device also comprises a pressure stabilizing device; the pressure stabilizing device comprises a pressure stabilizing air source and a pressure stabilizing self-operated adjusting valve, the pressure stabilizing air source is communicated with the ash tank through a pipeline, and the pressure stabilizing self-operated adjusting 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 the ash slag flows out of the ash slag tank, and the selected pressure stabilizing gas does not generate a chemical reaction with the ash slag or coal or can generate a chemical reaction with the coal to generate a substance 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, an included angle between the compressed air pipe and the ash slag pipeline is smaller than a complementary angle of an ash slag repose angle.
The included angle between the compressed air tank and the ash residue pipeline is smaller than the residual angle of the ash residue repose angle, so that the ash residue is conveyed along the air flow, the air flow of the conveyed air is reduced, and meanwhile, the ash residue is gathered on the pipeline of the compressed air pipe after the abnormal condition backflow is avoided.
Preferably, a gas-solid regulating valve is arranged on the ash slag pipeline between the compressed air pipe and the hole opening of the air inlet hole, and the gas-solid regulating valve and the feeding regulating valve are controlled in an interlocking mode.
The gas-solid governing valve can control the lime-ash volume that the lime-ash flowed into underground gasifier in the lime-ash jar, and the lime-ash volume that the feed governing valve can control the inflow lime-ash jar through the cooperation of gas-solid governing valve with the feed governing valve, can make the material level in the lime-ash jar keep invariable relatively, the operating personnel's of being convenient for operation.
Preferably, the opening of the air inlet hole is sealed, the top end of the ash pipeline penetrates through the opening of the air inlet hole in a sealing mode, and a gasifying agent pipeline of the underground gasification furnace is communicated with the air inlet hole.
The underground part of the ash pipeline is arranged in the air inlet hole, so that a gas-solid mixture flowing in the ash pipeline is prevented from being subjected to heat and cold exchange with a cold medium outside the ash pipeline to separate out water, the smooth flowing of the gas-solid mixture in the ash pipeline is influenced, meanwhile, the gas-solid mixture is not subjected to heat and cold 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 underground gasification reaction is facilitated.
The utility model has the advantages that: 1. by utilizing the system of the utility model, ash slag generated by the ground gasification process can be continuously filled into the burning space area of the underground gasification furnace, thereby not only solving the storage and treatment problems of the ash slag, but also ensuring the space stability of the gasification reaction area of the underground gasification furnace, and further ensuring the stability of the reaction intensity and the gasification efficiency of the underground gasification furnace; 2. the gas required by the underground gasification reaction is used as the ash conveying gas, so that ash can be ensured to smoothly enter the combustion space, 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 problem that the smooth flowing of the gas-solid mixture is influenced because the gas-solid mixture in the ash conveying pipeline exchanges heat with a cold medium outside the pipeline separates out water from the gas-solid mixture in the pipeline is effectively avoided, and meanwhile, steam enters the underground gasification furnace, so that the underground gasification reaction in a water-deficient area is facilitated.
Description of the drawings:
in order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the description below are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1: the system connection scheme of example 1;
in the figure: 1. ash tank, 2, ash pipeline, 3, underground gasification furnace, 4, pneumatic conveyor, 5, pressure stabilizer, 6, feeding regulating valve, 7, discharge stop valve, 8, air inlet, 9, combustion space area, 10, gasifying agent pipeline, 11, compressed air pipe, 12, gas-solid regulating valve, 13, pressure stabilizing air source, 14, pressure stabilizing self-operated regulating valve, 15 and gasifying agent regulating valve.
The specific implementation mode is as follows:
the following description is made for the purpose of illustrating the principles and features of the present invention, and is not intended to limit the scope of the invention.
Example 1:
as shown in fig. 1, a continuous ash conveying and processing system for an underground coal gasification furnace comprises an ash tank 1, an ash pipeline 2, an underground gasification furnace 3, a pneumatic conveying device 4 and a pressure stabilizing device 5; be equipped with feeding governing valve 6 on ash tank 1's feed inlet, through feeding governing valve 6, guarantee that ash tank 1's material level keeps in predetermineeing the interval, and the lower limit value of the material level in ash tank 1 is higher than ash tank 1's bottommost, and the upper limit value of the material level in ash tank 1 can not influence and open feeding governing valve 6. When detecting that the material level in the ash tank 1 is close to the lower limit value of the preset value interval, the feeding regulating valve 6 is opened to start feeding, the equipment which is connected with the feeding regulating valve 6 and provides ash is ensured to keep consistent pressure with the ash tank 1, and when detecting that the material level of the ash tank 1 reaches the upper limit value, the feeding regulating valve 6 is closed to stop feeding. A discharge stop valve 7 is arranged on a discharge hole 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 gasification furnace 3 and is arranged in a combustion space 9 of the underground gasification furnace 3, the orifice of the air inlet 8 is sealed, the top end of the ash pipeline 2 passes through the orifice of the air inlet 8 in a sealing manner, a gasifying agent pipeline 10 of the underground gasification furnace 3 is communicated with the air inlet 8, and a gasifying agent regulating valve 15 is arranged on the gasifying agent pipeline 10 and used for regulating the amount of a gasifying agent entering the underground gasification furnace 3. The gasifying agent is superheated steam, the temperature of the superheated steam is higher than the temperature of the gas-solid mixture in the ash and slag pipeline 2 reaching the combustion space zone 9 without separating out water, and is not lower than the maximum value of the saturated steam temperature of the superheated steam under the pressure at the outlet of the air inlet 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 complementary angle of the ash repose angle. And a gas-solid regulating valve 12 is arranged on the ash slag pipeline 2 between the compressed air pipe 11 and the orifice of the air inlet 8, and the gas-solid regulating valve 12 and the feeding regulating valve 6 are controlled in an interlocking manner. The ash slag is conveyed by gas through the pneumatic conveying device 4, so that the abrasion of the ash slag to the ash slag 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 beneficial to the gasification reaction of the underground gasification furnace 3, and the pneumatic conveying device 4 can convey the ash slag to the combustion space 9 and can convey the gas participating in the gasification reaction to the underground gasification furnace 3. The included angle between the compressed air tank and the ash residue pipeline 2 is smaller than the residual angle of the ash residue repose angle, so that the ash residue is conveyed along the air flow, the air flow of the conveyed air is reduced, and meanwhile, the ash residue is prevented from being accumulated on the pipeline of the compressed air pipe 11 after the abnormal condition backflow occurs.
The pressure stabilizing device 5 comprises a pressure stabilizing air source 13 and a pressure stabilizing self-operated regulating valve 14, 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. Pressure stabilizer 5 can be at the in-process that ash flows out ash jar 1, keeps the pressure relatively stable in the ash jar 1, and nitrogen gas does not produce chemical reaction with the ash, chooses for use nitrogen gas as steady voltage gas, can not change the composition of ash, does not have the influence to the reaction of underground gasification stove 3.
The working description is as follows:
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 utilizing conveying gas; the pressure at the outlet of the ash residue pipeline 2 is increased by 100 to 500kPa than the pressure at the outlet of the gasifying agent pipeline 10 by adjusting the gas-solid regulating valve 12, and simultaneously, the ratio of the ash residue conveying amount to the gas amount of the conveying gas is 10 to 30kg/m 3 Within the range, when the gas-solid mixture in the ash residue pipeline 2 and the gasifying agent in the gasifying agent pipeline 10 reach an outlet, the gas-solid mixture does not separate out moisture, and the gasifying agent is still in a steam state.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit of the present invention should be included within the protection scope of the present invention.
Claims (6)
1. A continuous ash conveying and processing system of an underground 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 tank; the ash residue pipeline is arranged on a discharge hole of the ash residue tank, the top end of the ash residue 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 residue pipeline.
2. The system for continuously conveying and treating the ash of the underground coal gasification furnace as claimed in claim 1, wherein a discharge stop valve is provided at a discharge port of the ash tank.
3. The system for continuously conveying and treating the ash of the underground coal gasification furnace 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 adjusting valve, the pressure stabilizing air source is communicated with the ash tank through a pipeline, and the pressure stabilizing self-operated adjusting valve is arranged on the pipeline between the pressure stabilizing air source and the ash tank.
4. The system of claim 1, wherein an included angle between the compressed air pipe and the ash pipeline is smaller than a complementary angle of an ash repose angle.
5. The system for continuously conveying and treating the ash of the underground coal gasification furnace as claimed in claim 1, wherein a gas-solid regulating valve is provided on the ash pipeline between the compressed air pipe and the opening of the air inlet hole, and the gas-solid regulating valve is controlled in an interlocking manner with the feed regulating valve.
6. The continuous ash conveying and processing system for the underground coal gasification furnace according to claim 1, wherein the opening of the air inlet hole is sealed, the top end of the ash pipeline penetrates through the opening of the air inlet hole in a sealing manner, and the gasification agent pipeline of the underground coal gasification furnace is communicated with the air inlet hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222633640.9U CN218860652U (en) | 2022-09-30 | 2022-09-30 | Continuous ash conveying and processing system for underground coal gasification furnace |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202222633640.9U CN218860652U (en) | 2022-09-30 | 2022-09-30 | Continuous ash conveying and processing system for underground coal gasification furnace |
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| CN218860652U true CN218860652U (en) | 2023-04-14 |
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| CN202222633640.9U Active CN218860652U (en) | 2022-09-30 | 2022-09-30 | Continuous ash conveying and processing system for underground coal gasification furnace |
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