CN112604420B - Hydrogen sulfide purifying device and method for high-sulfur coal seam gas extraction - Google Patents
Hydrogen sulfide purifying device and method for high-sulfur coal seam gas extraction Download PDFInfo
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- CN112604420B CN112604420B CN202011338787.4A CN202011338787A CN112604420B CN 112604420 B CN112604420 B CN 112604420B CN 202011338787 A CN202011338787 A CN 202011338787A CN 112604420 B CN112604420 B CN 112604420B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D47/00—Separating dispersed particles from gases, air or vapours by liquid as separating agent
- B01D47/02—Separating dispersed particles from gases, air or vapours by liquid as separating agent by passing the gas or air or vapour over or through a liquid bath
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/52—Hydrogen sulfide
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
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Abstract
The invention discloses a hydrogen sulfide purifying device and a method for extracting high-sulfur coal seam gas, wherein the device comprises a gas extracting pipe I, a gas extracting pipe II, a dewatering bin and a purifying bin, wherein mixed gas of the gas extracted from the high-sulfur coal seam and hydrogen sulfide firstly passes through the dewatering bin, and at the moment, water and coal slag in the mixed gas can be settled in the dewatering bin to finish the filtering effect on the mixed gas; then the mixed gas passes through a purification bin, sodium carbonate solution in the purification bin reacts with hydrogen sulfide gas to generate sodium hydrosulfide, water and carbon dioxide, and the sodium hydrosulfide is easily dissolved in the water; thereby realizing the purification effect on the hydrogen sulfide gas; finally, the gas enters a gas extraction pipe II, and when the gas passes through a purification film, the residual hydrogen sulfide gas reacts with zinc oxide to be absorbed, and finally, the gas passes through a drying film to absorb moisture to finish the purification and dehydration processes of the gas, so that the purity of the extracted gas can be ensured.
Description
Technical Field
The invention relates to a hydrogen sulfide purifying device and method, in particular to a hydrogen sulfide purifying device and method for high-sulfur coal seam gas extraction.
Background
The gas in the coal seam is not only a dangerous source, but also a clean energy source, and most high-gas mines utilize the gas in the coal seam through extraction. Aiming at the high-sulfur coal seam, the gas contains a large amount of hydrogen sulfide gas which is used as an acidic poisonous and harmful gas, and the hydrogen sulfide is very easy to corrode a gas extraction pipeline. Alkali injection and sulfur fixation of coal beds are effective hydrogen sulfide treatment methods, however, alkali liquor is difficult to permeate in dense coal beds, and the contact area of the alkali liquor and coal bodies is limited, so that a large amount of hydrogen sulfide still remains in extracted gas. The current treatment of coal mine hydrogen sulfide is mostly focused on the aspects of abnormal enrichment of coal seam hydrogen sulfide, purification of roadway wind flow hydrogen sulfide and the like, and the treatment of hydrogen sulfide gas in a gas extraction pipeline is not considered.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides the hydrogen sulfide purifying device and the method for extracting the high-sulfur coal seam gas, which can purify the hydrogen sulfide gas in the coal seam gas extracting process, simultaneously dehydrate the gas and filter the coal slag, and finally ensure the purity of the extracted gas.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: a hydrogen sulfide purifying device for high sulfur coal seam gas extraction comprises a gas extraction pipe I, a gas extraction pipe II, a dewatering bin and a purifying bin,
the dewatering bin comprises a bin body I, an air inlet pipe I and an air outlet pipe I, wherein the air inlet pipe I and the air outlet pipe I are vertically fixed at the upper end of the bin body I, and the air inlet pipe I and the air outlet pipe I are communicated with the inside of the bin body I, so that the bin body I, the air inlet pipe I and the air outlet pipe I form a U-shaped structure; the side part of the air inlet pipe I is provided with an air vent valve I, and the inside of the air inlet pipe I is provided with a liquid level sensor I for monitoring the water level in the dewatering bin; the side part of the bin body I is provided with a drain pipe I, the drain pipe I is provided with a drain valve I, and the air inlet pipe I and the air outlet pipe I are respectively provided with a valve A and a valve B;
the purifying bin comprises a bin body II, an air inlet pipe II and an air outlet pipe II, wherein the air inlet pipe II and the air outlet pipe II are vertically fixed at the upper end of the bin body II, and the air inlet pipe II and the air outlet pipe II are communicated with the inside of the bin body II, so that the bin body II, the air inlet pipe II and the air outlet pipe II form a U-shaped structure; the side part of the air inlet pipe II is provided with an air vent valve II, the side part of the air outlet pipe II is provided with an air vent valve III, and the inside of the air inlet pipe II is provided with a liquid level sensor II for monitoring the water level in the purifying bin; the side part of the bin body II is provided with a drain pipe II, the drain pipe II is provided with a drain valve II, and the air inlet pipe II and the air outlet pipe II are respectively provided with a valve C and a valve D; the purification bin is filled with sodium carbonate solution, the liquid level reaches the position where the liquid level sensor II is located, and the bin body II is internally provided with a concentration sensor for monitoring the concentration value of the sodium carbonate solution in real time;
the gas extraction pipe I is communicated with the gas inlet pipe I, the gas outlet pipe I is communicated with the gas inlet pipe II through a connecting pipe, and the gas outlet pipe II is communicated with the gas extraction pipe II; the gas extraction pipe II is internally provided with a purification film and a drying film, and the purification film is filled with a hydrogen sulfide absorbent; the drying film is filled with a drying agent.
Further, the bottoms of the bin body I and the bin body II are obliquely arranged. The liquid in the convenient dewatering bin and the purifying bin is discharged through the drain pipe I and the drain pipe II respectively.
Further, the hydrogen sulfide absorbent is zinc oxide; the drying agent is activated alumina. Zinc oxide can react with hydrogen sulfide to generate zinc sulfide and water when encountering hydrogen sulfide, so that the effect of absorbing the hydrogen sulfide is realized; the activated alumina can absorb water, thereby realizing the function of dehydration and drying.
The application method of the hydrogen sulfide purifying device for high-sulfur coal seam gas extraction comprises the following specific steps:
(1) in the initial state, the valve A, the valve B, the valve C, the valve D, the drain valve I, the drain valve II, the vent valve I, the vent valve II and the vent valve III are all in a closed state, the vent valve II and the vent valve III are opened, at the moment, sodium carbonate solution with the concentration of 2% is injected into the purification bin through the vent valve II, when the solution is detected by the liquid level sensor II, the liquid injection is stopped, and the vent valve II and the vent valve III are closed, so that the sodium carbonate solution injection process is completed;
(2) the method comprises the steps of communicating a gas extraction pipe I with a coal seam extraction pipe, communicating a gas extraction pipe II with an extraction pump, opening a valve A, a valve B, a valve C and a valve D, starting the extraction pump to extract gas at the moment, enabling gas mixed gas in the coal seam to sequentially pass through the gas extraction pipe I, a dewatering bin, a connecting pipe, a purifying bin and the gas extraction pipe II under the action of extraction negative pressure, enabling water and coal slag mixed during passing through the dewatering bin to be settled in the dewatering bin under the action of gravity, enabling most of the gas mixed gas after being treated by the dewatering bin to be absorbed by chemical reaction with sodium carbonate solution (sodium sulfide and sodium carbonate solution react to generate sodium hydrosulfide, water and carbon dioxide, and sodium hydrosulfide is easy to dissolve in water), enabling residual hydrogen sulfide gas to enter the gas extraction pipe II along with the gas, enabling the residual hydrogen sulfide gas to react with zinc oxide to be absorbed during passing through the purifying membrane, and finally enabling the residual hydrogen sulfide gas to pass through the drying membrane to absorb the gas and complete the dewatering process;
(3) in the continuous gas extraction purification and dehydration process, when a liquid level sensor I detects water, a valve A and a valve B are closed, a vent valve I and a drain valve I are opened, so that water and coal slag in a dehydration bin flow out through the drain pipe I, after the completion, the vent valve I and the drain valve I are closed, the valve A and the valve B are opened, and gas extraction is continued;
(4) when the liquid level sensor II does not detect the solution (namely, the liquid level of the sodium carbonate solution is lower than the liquid level sensor II) or the concentration sensor detects that the concentration of the sodium carbonate solution is lower than 0.5%, the valve C and the valve D are closed, the ventilation valve II and the drain valve II are opened, the solution in the purification bin flows out through the drain pipe II, the injection process of the sodium carbonate solution in step (1) is repeated after the completion, the valve C and the valve D are opened, and gas extraction is continued.
Compared with the prior art, the invention adopts a mode of combining the gas extraction pipe I, the gas extraction pipe II, the dewatering bin and the purifying bin, the mixed gas of the gas extracted from the high-sulfur coal seam and the hydrogen sulfide passes through the dewatering bin firstly, at the moment, water and coal slag in the mixed gas can be settled in the dewatering bin under the action of gravity, and the filtering effect on the mixed gas is completed; then the mixed gas passes through a purification bin, sodium carbonate solution in the purification bin reacts with hydrogen sulfide gas to generate sodium hydrosulfide, water and carbon dioxide, and the sodium hydrosulfide is easily dissolved in the water; thereby realizing the purification effect on the hydrogen sulfide gas; finally, the gas enters a gas extraction pipe II, and when the gas passes through a purification film, the residual hydrogen sulfide gas reacts with zinc oxide to be absorbed, and finally, the gas absorbs moisture through a drying film to finish the purification and dehydration processes of the gas. The invention can purify the hydrogen sulfide gas in the process of extracting the gas from the coal seam, and simultaneously can dehydrate the gas and filter the coal slag, thereby finally ensuring the purity of the extracted gas.
Drawings
Fig. 1 is a schematic structural view of the present invention.
In the figure: 1. the gas extraction pipe I, 2, a dewatering bin, 3, a purifying bin, 4, a connecting pipe, 5, valves A and 6, a ventilation valve I, 7, a liquid level sensor I, 8, a drain valve I, 9, a drain pipe I, 10, a valve B,11, a valve C,12, a ventilation valve II, 13, a liquid level sensor II, 14, a drain valve II, 15, a drain pipe II, 16, a concentration sensor, 17, a ventilation valve III, 18, a valve D,19, a purifying film, 20, a drying film, 21 and a gas extraction pipe II.
Description of the embodiments
The present invention will be further described below.
As shown in figure 1, the hydrogen sulfide purifying device for extracting high-sulfur coal seam gas comprises a gas extraction pipe I1, a gas extraction pipe II 21, a dewatering bin 2 and a purifying bin 3,
the dewatering bin 2 comprises a bin body I, an air inlet pipe I and an air outlet pipe I, wherein the air inlet pipe I and the air outlet pipe I are vertically fixed at the upper end of the bin body I, and the air inlet pipe I and the air outlet pipe I are communicated with the inside of the bin body I, so that the bin body I, the air inlet pipe I and the air outlet pipe I form a U-shaped structure; the side part of the air inlet pipe I is provided with an air vent valve I6, and the inside of the air inlet pipe I is provided with a liquid level sensor I7 for monitoring the water level in the dewatering bin 2; the side part of the bin body I is provided with a drain pipe I9, the drain pipe I is provided with a drain valve I8, and the air inlet pipe I and the air outlet pipe I are respectively provided with a valve A5 and a valve B10;
the purifying bin 3 comprises a bin body II, an air inlet pipe II and an air outlet pipe II, wherein the air inlet pipe II and the air outlet pipe II are vertically fixed at the upper end of the bin body II, and the air inlet pipe II and the air outlet pipe II are communicated with the inside of the bin body II, so that the bin body II, the air inlet pipe II and the air outlet pipe II form a U-shaped structure; the side part of the air inlet pipe II is provided with an air vent valve II 12, the side part of the air outlet pipe II is provided with an air vent valve III 17, and the inside of the air inlet pipe II is provided with a liquid level sensor II 13 for monitoring the water level in the purifying bin 3; the side part of the bin body II is provided with a drain pipe II 15, the drain pipe II 15 is provided with a drain valve II 14, and the air inlet pipe II and the air outlet pipe II are respectively provided with a valve C11 and a valve D18; the purification bin 3 is filled with sodium carbonate solution, the liquid level reaches the position where the liquid level sensor II 13 is located, and the bin body II is internally provided with a concentration sensor 16 for monitoring the concentration value of the sodium carbonate solution in real time;
the gas extraction pipe I1 is communicated with the gas inlet pipe I, the gas outlet pipe I is communicated with the gas inlet pipe II through a connecting pipe 4, and the gas outlet pipe II is communicated with the gas extraction pipe II 21; the gas extraction pipe II 21 is internally provided with a purification membrane 19 and a drying membrane 20, and the purification membrane 19 is filled with a hydrogen sulfide absorbent; the desiccant membrane 20 is filled with a desiccant.
Further, the bottoms of the bin body I and the bin body II are obliquely arranged. The liquid in the convenient dewatering bin 2 and the purifying bin 3 is discharged through the drain pipe I9 and the drain pipe II 15 respectively.
Further, the hydrogen sulfide absorbent is zinc oxide; the drying agent is activated alumina. Zinc oxide can react with hydrogen sulfide to generate zinc sulfide and water when encountering hydrogen sulfide, so that the effect of absorbing the hydrogen sulfide is realized; the activated alumina can absorb water, thereby realizing the function of dehydration and drying.
The liquid level sensor I7, the liquid level sensor II 13 and the concentration sensor 16 are all existing components.
The application method of the hydrogen sulfide purifying device for high-sulfur coal seam gas extraction comprises the following specific steps:
(1) in the initial state, the valve A5, the valve B10, the valve C11, the valve D18, the drain valve I8, the drain valve II 14, the vent valve I6, the vent valve II 12 and the vent valve III 17 are all in a closed state, the vent valve II 12 and the vent valve III 17 are opened, at the moment, sodium carbonate solution with the concentration of 2% is injected into the purification bin 3 through the vent valve II 12, when the solution is detected by the liquid level sensor II 13, the injection is stopped, and the vent valve II 12 and the vent valve III 17 are closed, so that the sodium carbonate solution injection process is completed;
(2) the gas extraction pipe I1 is communicated with a coal seam extraction pipe, the gas extraction pipe II 21 is communicated with an extraction pump, then a valve A5, a valve B10, a valve C11 and a valve D18 are opened, the extraction pump is started to extract gas at the moment, gas mixed gas in the coal seam sequentially passes through the gas extraction pipe I1, a dewatering bin 2, a connecting pipe 4, a purifying bin 3 and the gas extraction pipe II 21 under the action of extraction negative pressure, wherein water and coal slag mixed with the gas mixed gas when passing through the dewatering bin 2 are settled in the dewatering bin 2 under the action of gravity, then most of the gas mixed gas after being treated by the dewatering bin 2 is subjected to chemical reaction with sodium carbonate solution to be absorbed (sodium sulfide, water and carbon dioxide can be generated after the reaction of the hydrogen sulfide and the sodium carbonate solution, and sodium sulfide is easily dissolved in water), and the residual hydrogen sulfide gas enters the gas extraction pipe II 21 along with the gas, and finally the residual hydrogen sulfide gas and zinc oxide react to form a film 20 when passing through the purifying film 19, and the water absorption process is completed after the residual hydrogen sulfide gas and zinc oxide react and the gas are absorbed by the film 20 and the water absorption process is purified;
(3) in the continuous gas extraction purification and dehydration process, when the liquid level sensor I7 detects water, the valve A5 and the valve B10 are closed, the vent valve I6 and the drain valve I8 are opened, so that water and coal cinder in the dewatering bin 2 flow out through the drain pipe I9, after the completion, the vent valve I6 and the drain valve I8 are closed, the valve A5 and the valve B10 are opened, and the gas extraction is continued;
(4) when the liquid level sensor II 13 does not detect the solution (namely, the liquid level of the sodium carbonate solution is lower than the liquid level sensor II 13) or the concentration sensor 16 detects that the concentration of the sodium carbonate solution is lower than 0.5%, the valve C11 and the valve D18 are closed, the ventilation valve II 12 and the drain valve II 17 are opened, the solution in the purification bin 3 flows out through the drain pipe II 15, the injection process of the sodium carbonate solution in step (1) is repeated after the completion, and then the valve C11 and the valve D18 are opened, so that gas extraction is continued.
Claims (4)
1. A hydrogen sulfide purifying device for high sulfur coal seam gas extraction is characterized by comprising a gas extraction pipe I, a gas extraction pipe II, a dewatering bin and a purifying bin,
the dewatering bin comprises a bin body I, an air inlet pipe I and an air outlet pipe I, wherein the air inlet pipe I and the air outlet pipe I are vertically fixed at the upper end of the bin body I, and the air inlet pipe I and the air outlet pipe I are communicated with the inside of the bin body I, so that the bin body I, the air inlet pipe I and the air outlet pipe I form a U-shaped structure; the side part of the air inlet pipe I is provided with an air vent valve I, and the inside of the air inlet pipe I is provided with a liquid level sensor I for monitoring the water level in the dewatering bin; the side part of the bin body I is provided with a drain pipe I, the drain pipe I is provided with a drain valve I, and the air inlet pipe I and the air outlet pipe I are respectively provided with a valve A and a valve B; the valve A is arranged above the vent hole of the vent valve I;
the purifying bin comprises a bin body II, an air inlet pipe II and an air outlet pipe II, wherein the air inlet pipe II and the air outlet pipe II are vertically fixed at the upper end of the bin body II, and the air inlet pipe II and the air outlet pipe II are communicated with the inside of the bin body II, so that the bin body II, the air inlet pipe II and the air outlet pipe II form a U-shaped structure; the side part of the air inlet pipe II is provided with an air vent valve II, the side part of the air outlet pipe II is provided with an air vent valve III, and the inside of the air inlet pipe II is provided with a liquid level sensor II for monitoring the water level in the purifying bin; the side part of the bin body II is provided with a drain pipe II, the drain pipe II is provided with a drain valve II, the air inlet pipe II and the air outlet pipe II are respectively provided with a valve C and a valve D, the valve C is arranged above the vent hole of the vent valve II, and the valve D is arranged above the vent hole of the vent valve III; the purification bin is filled with sodium carbonate solution, the liquid level reaches the position where the liquid level sensor II is located, and the bin body II is internally provided with a concentration sensor for monitoring the concentration value of the sodium carbonate solution in real time;
the gas extraction pipe I is communicated with the gas inlet pipe I, the gas outlet pipe I is communicated with the gas inlet pipe II through a connecting pipe, and the gas outlet pipe II is communicated with the gas extraction pipe II; the gas extraction pipe II is internally provided with a purification film and a drying film, and the purification film is filled with a hydrogen sulfide absorbent; the drying film is filled with a drying agent.
2. The hydrogen sulfide purifying device for gas extraction of high-sulfur coal seams according to claim 1, wherein bottoms of the bin body I and the bin body II are obliquely arranged.
3. The hydrogen sulfide purification device for gas extraction in a high sulfur coal seam of claim 1, wherein the hydrogen sulfide absorbent is zinc oxide; the drying agent is activated alumina.
4. A method for using the hydrogen sulfide purification device for high sulfur coal seam gas extraction according to claim 1, which comprises the following specific steps:
(1) in the initial state, the valve A, the valve B, the valve C, the valve D, the drain valve I, the drain valve II, the vent valve I, the vent valve II and the vent valve III are all in a closed state, the vent valve II and the vent valve III are opened, at the moment, sodium carbonate solution with the concentration of 2% is injected into the purification bin through the vent valve II, when the solution is detected by the liquid level sensor II, the liquid injection is stopped, and the vent valve II and the vent valve III are closed, so that the sodium carbonate solution injection process is completed;
(2) the method comprises the steps of communicating a gas extraction pipe I with a coal seam extraction pipe, communicating a gas extraction pipe II with an extraction pump, opening a valve A, a valve B, a valve C and a valve D, starting the extraction pump to extract gas at the moment, enabling gas mixed gas in the coal seam to sequentially pass through the gas extraction pipe I, a dewatering bin, a connecting pipe, a purifying bin and the gas extraction pipe II under the action of extraction negative pressure, enabling water and coal slag mixed during passing through the dewatering bin to be settled in the dewatering bin under the action of gravity, enabling most of hydrogen sulfide gas after being treated by the dewatering bin to be absorbed through chemical reaction with sodium carbonate solution during passing through the purifying bin, enabling residual hydrogen sulfide gas to enter the gas extraction pipe II along with the gas, enabling residual hydrogen sulfide gas to react with zinc oxide to be absorbed during passing through the purifying membrane, and finally enabling the gas to pass through the drying membrane to absorb water to finish the purifying and dewatering processes of the gas;
(3) in the continuous gas extraction purification and dehydration process, when a liquid level sensor I detects water, a valve A and a valve B are closed, a vent valve I and a drain valve I are opened, so that water and coal slag in a dehydration bin flow out through the drain pipe I, after the completion, the vent valve I and the drain valve I are closed, the valve A and the valve B are opened, and gas extraction is continued;
(4) when the liquid level sensor II does not detect the solution or the concentration sensor detects that the concentration of the sodium carbonate solution is lower than 0.5%, the valve C and the valve D are closed, the ventilation valve II and the drain valve II are opened, so that the solution in the purification bin flows out through the drain pipe II, the injection process of the sodium carbonate solution in step (1) is repeated after the completion, and then the valve C and the valve D are opened to continue gas extraction.
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