Hydrogen sulfide gas recovery device

Abstract

The application discloses a hydrogen sulfide gas recovery device, which comprises a bottom plate, a filter press arranged at the upper end of the bottom plate, an air extraction unit, a recovery unit and the like. The air extraction unit comprises an auxiliary air extraction assembly used for continuously extracting hydrogen sulfide gas in the upper region of the filter press, a main air extraction assembly arranged at one side of the auxiliary air extraction assembly and used for increasing the negative pressure of the auxiliary air extraction assembly, and an air flow adjusting assembly arranged at the upper end of the main air extraction assembly and used for switching the air extraction position of the main air extraction assembly along the extension direction of the filter press. The air extraction is performed by adopting the mode of reciprocally switching the air inlet and the gas outlets of the plurality of air extraction cylinders. Compared with directly connecting the plurality of air inlets with the first shunt pipe, the air extraction channel can be concentrated by adopting the mode of reciprocally switching the air inlet and the gas outlets of the plurality of air extraction cylinders, the negative pressure of air extraction is further increased, and the extraction effect of hydrogen sulfide gas is improved.

Description

Technical Field

[0001] This invention relates to the field of flue gas treatment technology, specifically to a hydrogen sulfide gas recovery device. Background Technology

[0002] During the filtration process of waste acid liquid through a filter press, hydrogen sulfide gas is generated around the filter press. Hydrogen sulfide gas is a highly toxic gas with a rotten egg smell. Long-term inhalation of low concentrations of hydrogen sulfide gas by workers can cause damage to the central nervous system. Therefore, it is necessary to extract the hydrogen sulfide gas generated around the filter press in a timely manner and treat the exhaust gas.

[0003] Existing technologies typically use a fume extractor to absorb hydrogen sulfide gas generated during the filter press process and transfer it to the exhaust gas treatment area for processing. However, due to the long length of the filter press, existing technologies, in order to facilitate on-site installation and centralized recovery of hydrogen sulfide gas, usually employ a single fan with a single exhaust port to extract hydrogen sulfide gas covering a long area above the filter press. This results in a problem where the distance between the extracted hydrogen sulfide gas and the exhaust port is too far, and the negative pressure at the exhaust port is insufficient, leading to incomplete extraction of hydrogen sulfide gas further away from the exhaust port and poor hydrogen sulfide recovery.

[0004] The above content is only used to help understand the technical solution of the present invention and does not represent an admission that the above content is the closest prior art. Summary of the Invention

[0005] The purpose of this invention is to provide a hydrogen sulfide gas recovery device to solve the problem mentioned in the background art that the prior art usually uses a single fan and a corresponding single exhaust port to extract hydrogen sulfide gas covering a long area above the filter press. This has the problem that the distance between the extracted hydrogen sulfide gas and the exhaust port is too far, and the negative pressure at the exhaust port is insufficient, resulting in the hydrogen sulfide far from the exhaust port not being fully extracted, thus causing poor hydrogen sulfide recovery effect.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A hydrogen sulfide gas recovery device includes a base plate, a filter press placed on the upper part of the base plate, and further includes:

[0008] The extraction unit includes an auxiliary extraction component for continuously extracting hydrogen sulfide gas from the area above the filter press, a main extraction component located on one side of the auxiliary extraction component for increasing the negative pressure of the auxiliary extraction component, and an airflow regulating component located at the upper end of the main extraction component for switching the extraction position of the main extraction component along the extension direction of the filter press.

[0009] The recovery unit includes a hydrogen sulfide scrubbing tower and an alkaline scrubbing tower, which are sequentially arranged at the outlet of the extraction unit for absorbing hydrogen sulfide gas, and a fan arranged at the outlet of the alkaline scrubbing tower for continuously extracting gas from the entire extraction unit.

[0010] Furthermore, the airflow regulating component includes:

[0011] A gas collection hood is installed at the upper end of the filter press, and the cross-section of the gas collection hood is inverted V-shaped;

[0012] Multiple sets of partitions are connected sequentially to the lower end of the gas collection hood to divide the lower part of the gas collection hood into multiple independent air extraction zones.

[0013] The air guide holes correspond one-to-one with the multiple air extraction areas at the bottom of the gas collection hood, and are used to extract the hydrogen sulfide gas at the bottom of the gas collection hood in sections.

[0014] Furthermore, the airflow regulating component also includes:

[0015] The bracket is fixedly connected to the upper end of the gas collection hood;

[0016] A drive motor is mounted on the upper end of the bracket, and a cam is fixedly connected to the drive end of the drive motor;

[0017] A sleeve is connected between the support and the gas collection hood. The upper end of the sleeve and inside the support is provided with a through hole communicating with the sleeve. A first diversion pipe communicating with the recovery unit is provided on one side of the sleeve.

[0018] The lifting rod is slidably inserted into the sleeve, with the upper end of the lifting rod contacting the outer side of the cam.

[0019] A reset mechanism is located below the lifting rod and inside the sleeve, and is used to reset the lifting rod.

[0020] Furthermore, the lifting rod is provided with a flow groove on one side of the first diversion pipe, and the flow groove is connected to the first diversion pipe;

[0021] A vent is provided on one side of the lifting rod and at the bottom of the flow channel, and the vent is connected to the main air extraction assembly.

[0022] Furthermore, the reset mechanism includes:

[0023] A guide shaft is fixedly connected to the lower end of the sleeve, and a guide hole for guiding the guide shaft is provided inside the lifting rod and outside the guide shaft.

[0024] A return spring, sleeved on the outside of the guide shaft, is used to reset the lifting rod.

[0025] Furthermore, the main air extraction assembly includes:

[0026] An air extraction cylinder is fixedly connected to one side of the sleeve. The air extraction cylinder is connected to the inside of the sleeve and multiple sets are provided at equal intervals from top to bottom along the sleeve. The air outlet of the air extraction cylinder is the same size as the air inlet.

[0027] The first extraction pipe has multiple sets that correspond one-to-one with the air guide holes. One end of the first extraction pipe is connected to the air guide hole, and the other end is connected to the extraction cylinder. It is used to extract the hydrogen sulfide gas that could not be extracted by the auxiliary extraction component below the gas collection hood under the action of the airflow adjustment component.

[0028] Furthermore, the auxiliary air extraction assembly includes:

[0029] The second diversion pipe is located on one side of the gas collection hood;

[0030] The second exhaust pipe is provided with multiple sets corresponding to the air guide holes. One end of the second exhaust pipe is connected to the air guide hole, and the other end is connected to the second diversion pipe. It is used to extract hydrogen sulfide gas from different exhaust areas under the gas collection hood into the second diversion pipe.

[0031] The converging pipe has one end connected to the inside of the second extraction pipe and the other end connected to the first diverter pipe, and is used to introduce hydrogen sulfide gas in the second extraction pipe into the first diverter pipe.

[0032] Furthermore, the lower part of one side of the hydrogen sulfide scrubbing tower is connected to the gas outlet of the first diversion pipe through the first conduit.

[0033] The lower part of one side of the alkaline washing tower is connected to the upper part of the hydrogen sulfide washing tower through a second conduit;

[0034] The air inlet of the blower is connected to the upper part of the alkali washing tower through a third conduit.

[0035] Compared with the prior art, the beneficial effects of the present invention are:

[0036] 1. This invention uses a fan to continuously extract air from the alkali washing tower under the action of the third conduit. The alkali washing tower extracts air from the hydrogen sulfide washing tower under the action of the second conduit. The hydrogen sulfide washing tower extracts air from the first branch pipe under the action of the first conduit. The first branch pipe extracts air from the second branch pipe through the converging pipe. The second branch pipe extracts air from the guide hole through the second exhaust pipe. This allows multiple sets of second exhaust pipes to continuously extract hydrogen sulfide gas from their corresponding guide holes, preventing hydrogen sulfide gas from dispersing around the filter press and causing significant physical harm to workers.

[0037] 2. This invention uses a partition to isolate the lower part of the gas collection hood into multiple independent extraction zones, and sets multiple second extraction pipes connected to the extraction zones on one side of the second diversion pipe. This allows for a further increase in the effective extraction area of ​​hydrogen sulfide gas under the entire gas collection hood while only using one fan. This not only reduces energy consumption, but also avoids the phenomenon that insufficient negative pressure during extraction due to excessive distance from the extraction port will prevent the hydrogen sulfide gas from being fully extracted.

[0038] 3. In this invention, during the extraction process of the second extraction pipe, the drive motor is activated. The drive motor, through the cooperation of the cam and the return spring, drives the lifting rod to move up and down reciprocally. The lifting rod is connected to the air outlet of the extraction cylinder through the air inlet in sequence. Whenever it is connected to one of the extraction cylinders, the first diverting pipe extracts air through the flow groove in the extraction cylinder. The extraction cylinder extracts air through the first extraction pipe in the corresponding air guide hole. This allows the air guide hole to be further extracted by the first extraction pipe while being extracted by the second extraction pipe, which speeds up the extraction speed of the air guide hole and avoids the hydrogen sulfide gas not being extracted in time due to the slow extraction speed of the second extraction pipe.

[0039] 4. The present invention uses a method of switching between the vent and the outlet of multiple suction cylinders for gas extraction. Compared with directly connecting multiple vents to the first diversion pipe, the method of switching between the vent and the outlet of multiple suction cylinders can concentrate the gas extraction channel, further increase the negative pressure of the gas extraction, and improve the extraction effect of hydrogen sulfide gas. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0041] Figure 2 This is a diagram showing the gas flow direction at the lower part of the gas collection hood of the present invention;

[0042] Figure 3 This is a diagram showing the fit between the vacuum pump and the first vacuum pipe of the present invention.

[0043] Figure 4 This is a diagram showing the fit between the second diverter tube and the air guide hole in this invention.

[0044] Figure 5 This is a diagram showing the fit between the lifting rod and the sleeve in this invention.

[0045] Figure 6 For the present invention in Figure 5 Enlarged view of point A in the middle;

[0046] Figure 7 This is a schematic diagram of the lifting rod structure of the present invention.

[0047] Reference numerals: 100, base plate; 101, filter press; 1, extraction unit; 11, main extraction assembly; 111, extraction cylinder; 112, first extraction pipe; 12, airflow regulating assembly; 121, gas collection hood; 1211, air guide hole; 1212, partition; 122, bracket; 1221, through hole; 123, drive motor; 124, cam; 125, lifting rod; 1251, flow channel; 1252, air vent; 1 253. Guide hole; 126. Sleeve; 1261. First diversion pipe; 127. Reset mechanism; 1271. Reset spring; 1272. Guide shaft; 13. Auxiliary extraction assembly; 131. Second diversion pipe; 132. Second extraction pipe; 133. Converging pipe; 2. Recovery unit; 21. Hydrogen sulfide scrubbing tower; 211. First conduit; 22. Alkali scrubbing tower; 221. Second conduit; 222. Third conduit; 23. Fan. Detailed Implementation

[0048] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0049] Please see Figure 1-7 The present invention provides a technical solution:

[0050] A hydrogen sulfide gas recovery device includes a base plate 100, a filter press 101 placed on the upper end of the base plate 100, and further includes:

[0051] The extraction unit 1 includes an auxiliary extraction component 13 for continuously extracting hydrogen sulfide gas from the area above the filter press 101, a main extraction component 11 disposed on one side of the auxiliary extraction component 13 for increasing the negative pressure of the auxiliary extraction component 13, and an airflow regulating component 12 disposed on the upper end of the main extraction component 11 for switching the extraction position of the main extraction component 11 along the extension direction of the filter press 101.

[0052] The recovery unit 2 includes a hydrogen sulfide scrubbing tower 21 and an alkaline scrubbing tower 22, which are sequentially arranged at the outlet of the extraction unit 1 for absorbing hydrogen sulfide gas, and a fan 23, which is arranged at the outlet of the alkaline scrubbing tower 22 for continuously extracting gas from the entire extraction unit 1.

[0053] As an improvement, the airflow regulating component 12 includes:

[0054] A gas collection hood 121 is installed on the upper end of the filter press 101, and the cross-section of the gas collection hood 121 is inverted V-shaped;

[0055] Multiple sets of partitions 1212 are connected sequentially to the lower end of the gas collection hood 121 to divide the lower part of the gas collection hood 121 into multiple independent air extraction zones.

[0056] The air guide hole 1211 corresponds one-to-one with multiple air extraction areas at the lower part of the gas collection hood 121, and is used to extract hydrogen sulfide gas at the lower part of the gas collection hood 121 in sections.

[0057] Furthermore, the airflow regulating component 12 also includes:

[0058] The bracket 122 is fixedly connected to the upper end of the gas collection hood 121;

[0059] A drive motor 123 is mounted on the upper end of the bracket 122, and a cam 124 is fixedly connected to the drive end of the drive motor 123.

[0060] A sleeve 126 is connected between the bracket 122 and the gas collection hood 121. The upper end of the sleeve 126 and inside the bracket 122 is provided with a through hole 1221 communicating with the sleeve 126. A first diversion pipe 1261 communicating with the recovery unit 2 is provided on one side of the sleeve 126.

[0061] The lifting rod 125 is slidably inserted into the sleeve 126, and the upper end of the lifting rod 125 contacts the outer side of the cam 124.

[0062] The reset mechanism 127 is located below the lifting rod 125 and inside the sleeve 126, and is used to reset the lifting rod 125.

[0063] Furthermore, the lifting rod 125 is provided with a flow groove 1251 on one side of the first diversion pipe 1261, and the flow groove 1251 is connected to the first diversion pipe 1261.

[0064] A vent 1252 is provided on one side of the lifting rod 125 and at the bottom of the flow channel 1251, and the vent 1252 is connected to the main air extraction assembly 11.

[0065] The reset mechanism 127 includes:

[0066] The guide shaft 1272 is fixedly connected to the lower end of the sleeve 126. The lifting rod 125 is provided with a guide hole 1253 for guiding the guide shaft 1272 inside and outside the guide shaft 1272.

[0067] The return spring 1271 is sleeved on the outside of the guide shaft 1272 and is used to reset the lifting rod 125.

[0068] As an improvement, the main air extraction assembly 11 includes:

[0069] An air extraction cylinder 111 is fixedly connected to one side of the sleeve 126. The air extraction cylinder 111 is connected to the inside of the sleeve 126 and multiple sets are provided at equal intervals from top to bottom along the sleeve 126. The air outlet of the air extraction cylinder 111 is the same size as the air inlet 1252.

[0070] The first extraction pipe 112 is provided with multiple sets corresponding to the air guide holes 1211. One end of the first extraction pipe 112 is connected to the air guide hole 1211, and the other end is connected to the extraction cylinder 111. It is used to extract the hydrogen sulfide gas that could not be extracted by the auxiliary extraction component 13 under the action of the airflow regulating component 12.

[0071] Furthermore, the auxiliary air extraction assembly 13 includes:

[0072] The second diversion pipe 131 is located on one side of the gas collection hood 121;

[0073] The second exhaust pipe 132 is provided with multiple sets and corresponds one-to-one with the air guide hole 1211. One end of the second exhaust pipe 132 is connected to the air guide hole 1211 and the other end is connected to the second diversion pipe 131. It is used to extract hydrogen sulfide gas from different exhaust areas under the gas collection hood 121 into the second diversion pipe 131.

[0074] The converging pipe 133 is connected at one end to the interior of the second extraction pipe 132 and at the other end to the first diverter pipe 1261, and is used to introduce hydrogen sulfide gas in the second extraction pipe 132 into the first diverter pipe 1261.

[0075] As an improvement, the lower part of one side of the hydrogen sulfide scrubbing tower 21 is connected to the gas outlet of the first diversion pipe 1261 through the first conduit 211;

[0076] The lower part of one side of the alkaline washing tower 22 is connected to the upper part of the hydrogen sulfide washing tower 21 through the second conduit 221;

[0077] The air inlet of the fan 23 is connected to the upper part of the alkaline washing tower 22 through the third conduit 222.

[0078] It should be noted that in the specific implementation of this invention, when it is necessary to extract the hydrogen sulfide gas generated by the filter press 101, the blower 23 is started. The blower 23 continuously extracts gas from the alkaline washing tower 22 under the action of the third conduit 222. The alkaline washing tower 22 extracts gas from the hydrogen sulfide washing tower 21 under the action of the second conduit 221. The hydrogen sulfide washing tower 21 extracts gas from the first diversion pipe 1261 under the action of the first conduit 211. The first diversion pipe 1261 extracts gas from the second diversion pipe 131 through the converging pipe 133. The second diversion pipe 131 extracts gas from the air guide hole 1211 through the second exhaust pipe 132. This allows multiple sets of second exhaust pipes 132 to continuously extract the hydrogen sulfide gas from their corresponding air guide holes 1211, preventing the hydrogen sulfide gas from dispersing around the filter press 101 and causing significant physical harm to workers.

[0079] This invention uses a partition 1212 to isolate the lower part of the gas collection hood 121 into multiple independent gas extraction areas, and sets multiple second gas extraction pipes 132 connected to the gas extraction areas on one side of the second diversion pipe 131. This allows for a further increase in the effective gas extraction area of ​​hydrogen sulfide gas under the entire gas collection hood 121 while only using one fan 23. This not only reduces energy consumption, but also avoids the phenomenon that insufficient negative pressure during gas extraction due to excessive distance from the gas extraction port will result in insufficient extraction of hydrogen sulfide gas.

[0080] Furthermore, to prevent the hydrogen sulfide gas from being drawn out of the second extraction pipe 132 at a rate lower than that generated by the sulfidation device, thus preventing the hydrogen sulfide gas from being dispersed around the filter press 101 due to insufficient extraction speed, the present invention activates the drive motor 123 during the extraction process of the second extraction pipe 132. The drive motor 123, through the cam 124 and in conjunction with the return spring 1271, drives the lifting rod 125 to reciprocate up and down. The lifting rod 125 moves along the extraction cylinder 1 through the vent 1252. The 11 air outlets are connected sequentially. Whenever they are connected to one of the suction cylinders 111, the first diversion pipe 1261 draws air from the suction cylinder 111 through the flow groove 1251. The suction cylinder 111 draws air from the corresponding air guide hole 1211 through the first suction pipe 112. This allows the air guide hole 1211 to be further drawn by the first suction pipe 112 while being drawn by the second suction pipe 132, which speeds up the air drawing speed of the air guide hole 1211 and prevents the hydrogen sulfide gas from not being extracted in time due to the slow air drawing speed of the second suction pipe 132.

[0081] In this invention, the air extraction is performed by switching between the vent 1252 and the outlets of multiple air extraction cylinders 111. Compared with directly connecting the multiple vents 1252 to the first diversion pipe 1261, the air extraction channel can be concentrated by switching between the vent 1252 and the outlets of multiple air extraction cylinders 111, which further increases the negative pressure of the air extraction and improves the extraction effect of hydrogen sulfide gas.

[0082] It should be added that, in this invention, after the hydrogen sulfide gas is extracted by the extraction unit 1 and sent to the recovery unit 2, the hydrogen sulfide gas is sent to the hydrogen sulfide scrubbing tower 21 through the first conduit 211 for spraying treatment. The spraying liquid is H3AsO3 liquid. When H2S gas and H3AsO3 liquid are mixed, they undergo a chemical reaction. The chemical reaction equation is 2H3AsO3 + 3H2S = As2S3 + 6H2O, which converts the hydrogen sulfide gas into arsenic sulfide in a sol state, ensuring that the recovered hydrogen sulfide can be used to produce arsenic sulfide sol. For the small amount of hydrogen sulfide gas that leaks out in the hydrogen sulfide scrubbing tower 21, it enters the alkaline scrubbing tower 22 through the second conduit 221, where the hydrogen sulfide gas is absorbed by an alkaline solution. The alkaline solution can be sodium hydroxide solution, thereby achieving the effect of complete absorption of hydrogen sulfide gas.

[0083] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0084] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A hydrogen sulfide gas recovery apparatus comprising a base plate (100), a filter press (101) disposed on an upper end of the base plate (100), characterized in that, Also include: The gas extraction unit (1) includes a secondary gas extraction assembly (13) for continuously extracting hydrogen sulfide gas in the area above the filter press (101), a main gas extraction assembly (11) arranged on one side of the secondary gas extraction assembly (13) to increase the negative pressure of the secondary gas extraction assembly (13), and a gas flow adjusting assembly (12) arranged at the upper end of the main gas extraction assembly (11) to switch the gas extraction position of the main gas extraction assembly (11) along the extension direction of the filter press (101); The recovery unit (2) includes a hydrogen sulfide washing tower (21), an alkali washing tower (22) arranged in sequence at the gas outlet end of the gas extraction unit (1) for absorbing hydrogen sulfide gas, and a fan (23) arranged at the gas outlet end of the alkali washing tower (22) for continuously extracting hydrogen sulfide gas from the entire gas extraction unit (1); The gas flow adjusting assembly (12) includes: A gas collecting hood (121) is installed at the upper end of the filter press (101), and the cross section of the gas collecting hood (121) is inverted V-shaped; A plurality of partitions (1212) are arranged in sequence at the lower end of the gas collecting hood (121) to separate the lower part of the gas collecting hood (121) into a plurality of independent gas extraction areas; A plurality of gas guide holes (1211) correspond to the plurality of gas extraction areas at the lower part of the gas collecting hood (121) to extract hydrogen sulfide gas from the lower part of the gas collecting hood (121) in a region-by-region manner; The gas flow adjusting assembly (12) further includes: A support (122) is fixedly connected to the upper end of the gas collecting hood (121); A drive motor (123) is installed at the upper end of the support (122), and the drive end of the drive motor (123) is fixedly connected with a cam (124); A sleeve (126) is connected between the support (122) and the gas collecting hood (121), and a through hole (1221) is arranged at the upper end of the sleeve (126) and located inside the support (122), and a first shunt pipe (1261) is arranged on one side of the sleeve (126) and connected with the recovery unit (2); A lifting rod (125) is slidably inserted into the sleeve (126), and the upper end of the lifting rod (125) is in contact with the outer side of the cam (124); A reset mechanism (127) is arranged below the lifting rod (125) and located inside the sleeve (126) to reset the lifting rod (125); A flow-through groove (1251) is arranged on one side of the lifting rod (125) and located at the bottom of the flow-through groove (1251), and the flow-through groove (1251) is connected with the first shunt pipe (1261); An air vent (1252) is arranged on one side of the lifting rod (125) and located at the bottom of the flow-through groove (1251), and the air vent (1252) is connected with the main gas extraction assembly (11); The reset mechanism (127) includes: A guide shaft (1272) is fixedly connected to the lower end of the sleeve (126), and a guide hole (1253) is arranged inside the lifting rod (125) and located outside the guide shaft (1272) to guide the guide shaft (1272); A reset spring (1271) is sleeved outside the guide shaft (1272) and used for resetting the lifting rod (125); The main gas extraction assembly (11) comprises: A gas extraction cylinder (111) is fixedly connected to one side of the sleeve (126), the gas extraction cylinder (111) is communicated with the inside of the sleeve (126), and a plurality of groups of the gas extraction cylinder (111) are arranged at equal intervals from top to bottom along the sleeve (126), and the gas outlet of the gas extraction cylinder (111) is equal in size to the air vent (1252); A first gas extraction pipe (112) is provided in a plurality of groups and corresponds to the gas guide hole (1211) in a one-to-one manner, one end of the first gas extraction pipe (112) is communicated with the gas guide hole (1211), the other end is communicated with the gas extraction cylinder (111), and the first gas extraction pipe (112) is used for extracting hydrogen sulfide gas under the action of the air flow adjusting assembly (12) and failing to be extracted by the auxiliary gas extraction assembly (13) below the gas collecting cover (121); The lifting rod (125) is sequentially communicated with the air vent (1252) along the gas outlets of the gas extraction cylinders (111).

2. The hydrogen sulfide gas recovery device according to claim 1, wherein: The auxiliary gas extraction assembly (13) comprises: A second shunt pipe (131) is arranged on one side of the gas collecting cover (121); A second gas extraction pipe (132) is provided in a plurality of groups and corresponds to the gas guide hole (1211) in a one-to-one manner, one end of the second gas extraction pipe (132) is communicated with the gas guide hole (1211), the other end is communicated with the second shunt pipe (131), and the second gas extraction pipe (132) is used for extracting hydrogen sulfide gas in different gas extraction areas in the lower part of the gas collecting cover (121) into the second shunt pipe (131); A converging pipe (133) is communicated with the inside of the second gas extraction pipe (132) at one end and with the gas outlet end of the first shunt pipe (1261) at the other end, and is used for guiding the hydrogen sulfide gas in the second gas extraction pipe (132) into the first shunt pipe (1261).

3. The hydrogen sulfide gas recovery device according to claim 1, wherein: The lower part of one side of the hydrogen sulfide washing tower (21) is communicated with the gas outlet end of the first shunt pipe (1261) through a first guide pipe (211); The lower part of one side of the alkali washing tower (22) is communicated with the upper part of the hydrogen sulfide washing tower (21) through a second guide pipe (221); The air inlet end of the fan (23) is communicated with the upper part of the alkali washing tower (22) through a third guide pipe (222).

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