Purification of hydrogen sulfide gas containing process generated phosphorus pentasulfide dephosphorization impurities

Abstract

The application discloses a purifying device for purifying a sulfur hydride gas generated by a phosphorus pentasulfide dephosphorization impurity process, which comprises a sulfur hydride absorption tower, a first absorption liquid circulating pump, a second absorption liquid circulating pump, a first tail gas exhaust fan, a second tail gas exhaust fan, a sulfurized absorption liquid liquid seal tank and an exhaust cylinder; a sulfur hydride gas collecting pipe is arranged on the gas inlet of the sulfur hydride absorption tower; a spray head is arranged on the top of the sulfur hydride absorption tower; one end of a circulating main pipe is connected with a circulating liquid liquid inlet of the sulfur hydride absorption tower, and the other end is connected with the spray head; the circulating main pipe is connected with a first branch pipe and a second branch pipe; the first absorption liquid circulating pump is arranged on the first branch pipe; and the second absorption liquid circulating pump is arranged on the second branch pipe. The device can avoid the leakage of harmful gas generated in continuous production, improve the reliability of production and installation, and avoid serious safety accidents.

Description

Technical Field

[0001] This application relates to the field of acid purification technology, and in particular to a purification device for hydrogen sulfide-containing gas generated during the dephosphorization of phosphorus pentasulfide. Background Technology

[0002] Existing acid purification production equipment uses phosphorus pentasulfide (P2S5) to remove arsenic and other heavy metal ions from phosphoric acid, a process known as phosphoric acid deweighting. However, the phosphorus pentasulfide solution generates highly toxic hydrogen sulfide (H2S) gas during the preparation, deweighting, and aeration processes of phosphoric acid deweighting. Traditional single-loop processes rely on manual operation to control the reaction, posing a risk of hydrogen sulfide leakage. In the event of a leak, it would pose a serious threat to personnel safety and the environment.

[0003] The information disclosed in the background section is intended only to enhance the understanding of the overall background of this utility model and should not be construed as an admission or in any way implying that such information constitutes prior art known to those skilled in the art. Utility Model Content

[0004] This application addresses the aforementioned technical problem by providing a purification device for hydrogen sulfide-containing gas generated during the phosphoric acid removal process of phosphorus pentasulfide. This device improves the safety of heavy gas treatment by using paired fans and circulating pumps in conjunction with the circuit control structure, and completely eliminates the risk of personnel and the environment being exposed to hydrogen sulfide gas.

[0005] This application provides a purification device for hydrogen sulfide-containing gas generated during the phosphoric acid removal process of phosphorus pentasulfide, comprising: a hydrogen sulfide absorption tower, a first absorption liquid circulation pump, a second absorption liquid circulation pump, a first tail gas exhaust fan, a second tail gas exhaust fan, a sulfide absorption liquid sealing tank, and an exhaust stack.

[0006] A hydrogen sulfide gas collection pipe is installed at the inlet of the hydrogen sulfide absorption tower; a spray head is installed at the top of the hydrogen sulfide absorption tower; one end of the circulation main pipe is connected to the circulating liquid port of the hydrogen sulfide absorption tower, and the other end is connected to the spray head; the circulation main pipe is connected to the first branch pipe and the second branch pipe respectively.

[0007] A first absorbent circulation pump is installed on the first branch pipe; a second absorbent circulation pump is installed on the second branch pipe.

[0008] An exhaust port is provided at the top of the hydrogen sulfide absorption tower. The exhaust port is connected to the exhaust stack through an exhaust pipe. The exhaust pipe is connected to the third branch pipe and the fourth branch pipe respectively. A first exhaust gas exhaust fan is installed on the third branch pipe. A second exhaust gas exhaust fan is installed on the fourth branch pipe.

[0009] The liquid collection area at the bottom of the hydrogen sulfide absorption tower is connected to the liquid seal tank pipeline of the sulfide absorption liquid.

[0010] Preferably, the first absorbent circulation pump includes: a first circulation pump power supply, a first circulation pump motor, and a dual power supply automatic transfer switch; the first circulation pump power supply is electrically connected to the first set of input terminals of the dual power supply automatic transfer switch.

[0011] The second absorbent circulation pump includes: a second circulation pump power supply and a second circulation pump motor; the second circulation pump power supply is electrically connected to the second set of input terminals of the dual power supply automatic transfer switch; the first circulation pump motor, the second circulation pump motor, and the output terminals of the dual power supply automatic transfer switch are electrically connected in parallel.

[0012] Preferably, the first exhaust gas exhaust fan includes: a first AC motor, a first fan power supply, and a dual power supply automatic transfer switch; the first fan power supply is electrically connected to the first set of input terminals of the dual power supply automatic transfer switch;

[0013] The second exhaust gas fan includes: a second AC motor and a second fan power supply; the second fan power supply is electrically connected to the second set of output terminals of the dual power automatic transfer switch.

[0014] The first AC motor, the second AC motor, and the output terminals of the dual-power automatic transfer switch are connected in parallel.

[0015] Preferably, it includes: multiple control valves; control valves are respectively installed on the inlet pipe and outlet pipe of the first absorbent circulation pump; control valves are respectively installed on the inlet pipe and outlet pipe of the second absorbent circulation pump.

[0016] Preferably, it includes: multiple control valves; control valves are respectively installed on the inlet pipe and outlet pipe of the first exhaust gas fan; control valves are respectively installed on the inlet pipe and outlet pipe of the second exhaust gas fan.

[0017] Preferably, it includes: a first pressure gauge and a second pressure gauge; the exhaust pipe includes: a first section and a second section; the first section is connected to one end of the third branch pipe and the fourth branch pipe; the second section is connected to the other end of the third branch pipe and the fourth branch pipe; a first pressure gauge is installed on the first section; a second pressure gauge is installed on the second section; the other end of the first section is connected to the exhaust port of the hydrogen sulfide absorption tower; the other end of the second section is connected to the exhaust stack.

[0018] Preferably, the drain outlet at the bottom of the exhaust stack is connected to the liquid seal tank of the sulfur absorption liquid.

[0019] Preferably, it includes: a sulfidation absorbent transfer pump, a stirrer, and an online pH monitor; the drain outlet of the sulfidation absorbent liquid sealing tank is connected to the deweighting tank, and a sulfidation absorbent transfer pump is installed on the connecting pipeline;

[0020] A stirrer is installed inside the liquid seal tank for the sulfur absorption liquid.

[0021] An online pH monitor is installed on the inner wall of the sulfide absorption liquid sealing tank.

[0022] Preferably, the spray head is an anti-clogging spray head.

[0023] Preferably, it includes: a cyclone demister; a cyclone demister is installed above the spray head inside the hydrogen sulfide absorption tower.

[0024] The beneficial effects that this application can produce include:

[0025] 1) The purification device for hydrogen sulfide-containing gas generated during the phosphorus pentasulfide dephosphorization impurity process provided in this application can prevent the leakage of harmful gases generated in continuous production, improve the reliability of production installation, and avoid serious safety accidents. The H2S leakage accident rate is reduced to 0 (theoretical value), and it can be extended to other sulfur-containing and heavy metal-containing waste gas treatment scenarios (such as hydrometallurgy and petrochemical desulfurization). Attached Figure Description

[0026] Figure 1 A schematic diagram of the purification device for generating hydrogen sulfide gas during the phosphoric acid removal process of phosphorus pentasulfide in at least one embodiment provided in this application.

[0027] Figure 2 Circuit diagram of exhaust gas exhaust fan in at least one embodiment provided in this application;

[0028] Figure 3 Circuit diagram of the absorbent circulation pump in at least one embodiment provided in this application;

[0029] Legend:

[0030] Hydrogen sulfide absorption tower 1, absorption liquid valve 11, spray head 12, packing area 123, liquid collection area 124, collection fan 14, control valve 231, first pressure gauge 232, second pressure gauge 233.

[0031] Circulation pipe 121, first branch 122, second branch 132

[0032] First absorbent circulation pump 211, first circulation pump power supply 213, first circulation pump motor 215

[0033] Second absorption liquid circulation pump 212, second circulation pump power supply 214, second circulation pump motor 216.

[0034] Second exhaust gas exhaust fan 222, second AC motor 245, second fan power supply 242, first exhaust gas exhaust fan 221, first AC motor 243, first fan power supply 241, dual power supply automatic transfer switch 244, air switch QF1, AC contactor KM1, motor protector FH1, air switch QF2, AC contactor KM2, motor protector FH2, motor protector auxiliary contact FH1, AC contactor coil KM1, AC contactor auxiliary contact KM2, push button SB2, AC contactor auxiliary contact KM1, motor protector auxiliary contact FH2, push button SB1, push button SB3, motor protector auxiliary contact FH2, AC contactor coil KM2, AC contactor auxiliary contact KM1, push button SB4, AC contactor auxiliary contact KM2, motor protector auxiliary contact FH1

[0035] Cyclone demister 246

[0036] 3. Exhaust stack, 312. Sulfide absorption liquid transfer pump, 31. Agitator, 31. Sulfide absorption liquid seal tank, 311. pH online monitor, 315. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can typically be arranged and designed in various different configurations.

[0038] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0039] Technical means not detailed in this application and not used to solve the technical problems of this application are all set according to common general knowledge in the field, and multiple common general knowledge setting methods can be implemented.

[0040] See Figures 1-3This application provides a purification device for hydrogen sulfide-containing gas generated during the phosphoric acid removal process of phosphorus pentasulfide. This device effectively prevents hydrogen sulfide gas leakage. A collecting fan 14 centrally collects hydrogen sulfide gas from the production environment and sends it to a hydrogen sulfide absorption tower 1 (code T-63101) for treatment. The absorbent used is a sodium hydroxide solution derived from a liquid alkali tank. Sodium hydroxide reacts with hydrogen sulfide gas to form a sodium sulfide solution, effectively retaining the hydrogen sulfide (concentration 5%) in the collected gas. The reaction equation is: H₂S + 2NaOH = Na₂S + 2H₂O.

[0041] A packing zone 123 is installed above the central air inlet in the hydrogen sulfide absorption tower 1. Packing zone 123 is filled with packing material. Sodium hydroxide absorbent circulates through a circulation pipe 121 located outside the side wall of the hydrogen sulfide absorption tower 1. One end of the circulation pipe 121 is connected to the hydrogen sulfide absorption tower 1, and the other end is connected to the spray head 12 pipe at the top of the hydrogen sulfide absorption tower 1. To improve the continuous reliability of gas treatment, a first branch 122 and a second branch 132 are installed on the circulation pipe 121. Both ends of the first branch 122 and the second branch 132 are connected to the circulation pipe 121. A first absorbent circulation pump 211 is installed on the first branch 122, and a second absorbent circulation pump 212 is installed on the second branch 132. The absorbent circulation pump designation is P-63103A / B. If any circulation pump fails, the circulation pump on the other branch can be activated to ensure normal treatment of the gas entering the hydrogen sulfide absorption tower 1.

[0042] The absorbent liquid is pumped from the bottom of the tower through the circulation pipeline 121, pressurized, and then sprayed at high speed from the spray head 12 at the top of the tower onto the packing zone 123 in the middle of the tower, forming a broad absorption interface on each packing layer. Hydrogen sulfide gas enters from the bottom of the tower and flows upwards counterclockwise. The hydrogen sulfide gas reacts with the absorbent liquid sprayed on the surface of the packing. The remaining air passes through the packing layer and is discharged through the exhaust port located at the top of the hydrogen sulfide absorption tower 1. It is connected to the exhaust stack 3 (S-63101) through a pipeline. The connected pipeline is equipped with a first tail gas exhaust fan 221 and a second tail gas exhaust fan 222, respectively designated C-63103A / B. A small amount of liquid droplets carried by the exhaust gas accumulate on the inner wall of the exhaust stack 3. The bottom of the exhaust stack 3 is connected to the sulfur absorption liquid sealing tank 311 (V-61111) through a pipeline, and a small amount of liquid droplets fall back into the sulfur absorption liquid sealing tank 311 for collection.

[0043] By configuring a primary exhaust gas fan 221 and a secondary exhaust gas fan 222, one in operation and one on standby, the standby fan can be quickly activated if one fails. For exhaust gas scrubbing systems containing H2S, both the alkaline scrubbing circulating pump and the fan use dual-circuit power supplies, one in operation and one on standby. When the fan fails or the circulating scrubbing liquid flow rate is abnormal, the standby fan can be activated to ensure normal alkaline scrubbing and normal discharge of H2S exhaust gas.

[0044] The exhaust gas exhaust fans can be interlocked for switching on and off, and can be quickly activated if one fails. The circuits connecting the first exhaust gas exhaust fan 221 and the second exhaust gas exhaust fan 222 to their respective power supplies are as follows: Figure 2 As shown, the first exhaust gas exhaust fan 221 includes: a first AC motor 243 and a first fan power supply 241; the first fan power supply 241 is electrically connected to the first set of u input interface, v input interface and w input interface of the dual power automatic transfer switch 244; the dual power automatic transfer switch 244 is provided with u output interface, v output interface and w output interface; the first AC motor 243 and the second AC motor 245 are connected in parallel with the dual power automatic transfer switch 244.

[0045] The u, v, and w output interfaces are electrically connected to the first AC motor 243 via cables. An air switch QF1, an AC contactor KM1, and a motor protector FH1 are installed at intervals along the cable connecting the u output interface to the first AC motor 243. Similarly, an air switch QF1, an AC contactor KM1, and a motor protector FH1 are installed at intervals along the cable connecting the v output interface to the first AC motor 243. The w output interface is also equipped with an air switch QF1, an AC contactor KM1, and a motor protector FH1. The grounding output interface of the first AC motor 243 is grounded.

[0046] The second exhaust fan 222 includes: a second AC motor 245 and a second fan power supply 242; the second fan power supply 242 is electrically connected to the second set of u input interface, v input interface, and w input interface of the dual power automatic transfer switch 244; the dual power automatic transfer switch 244 is provided with u output interface, v output interface, and w output interface; the u output interface, v output interface, and w output interface are respectively electrically connected to the second AC motor 245 through cables, and an air switch QF2, an AC contactor KM2, and a motor protector FH2 are installed at intervals on the cables; the grounding output interface of the second AC motor 245 is grounded.

[0047] The N output interface of the dual power automatic transfer switch 244 is connected in parallel with the first motor protection branch and the second motor protection branch; the other end of the first motor protection branch and the second motor protection branch is connected in parallel with the W output interface of the dual power automatic transfer switch 244, and an air switch QF3 is installed on the connecting cable.

[0048] The first motor protection branch includes the following components connected in series on the cable: motor protector auxiliary contact FH1, AC contactor coil KM1, AC contactor auxiliary contact KM2, push button SB2, AC contactor auxiliary contact KM1, and motor protector auxiliary contact FH2.

[0049] In one specific embodiment, a button SB1 is provided on the auxiliary contact KM1 of the AC contactor to facilitate manual intervention by the operator as needed.

[0050] In one specific embodiment, a button SB3 is provided on the auxiliary contact KM2 of the AC contactor to facilitate manual intervention by the operator as needed.

[0051] The second motor protection branch includes the following components connected in series on the cable: motor protector auxiliary contact FH2, AC contactor coil KM2, AC contactor auxiliary contact KM1, push button SB4, AC contactor auxiliary contact KM2, and motor protector auxiliary contact FH1.

[0052] The absorbent circulation pumps can be interlocked for switching and starting; if one pump fails, the other can be quickly activated. The circuits connecting the first absorbent circulation pump 211 and the second absorbent circulation pump 212 to their respective power supplies are as follows: Figure 3 As shown, the first absorption liquid circulation pump 211 includes: a first circulation pump power supply 213 and a first circulation pump motor 215; the first circulation pump power supply 213 is electrically connected to the u input interface, v input interface and w input interface of the dual power automatic transfer switch 244; the dual power automatic transfer switch 244 is provided with a u output interface, a v output interface and a w output interface; the first circulation pump motor 215 and the second circulation pump motor 216 are connected in parallel with the dual power automatic transfer switch 244.

[0053] The u, v, and w output interfaces are electrically connected to the first circulating pump motor 215 via cables. An air switch QF1, an AC contactor KM1, and a motor protector FH1 are installed at intervals along the cable connecting the u output interface to the first circulating pump motor 215. Similarly, an air switch QF1, an AC contactor KM1, and a motor protector FH1 are installed at intervals along the cable connecting the v output interface to the first circulating pump motor 215. The w output interface of the first circulating pump motor 215 is grounded.

[0054] The second absorbent circulation pump 212 includes: a second circulation pump power supply 214 and a second circulation pump motor 216; the second circulation pump power supply 214 is electrically connected to the u input interface, v input interface, and w input interface of the dual power automatic transfer switch 244; the dual power automatic transfer switch 244 is provided with a u output interface, a v output interface, and a w output interface; the u output interface, v output interface, and w output interface are respectively electrically connected to the second circulation pump motor 216 through cables, and an air switch QF2, an AC contactor KM2, and a motor protector FH2 are installed at intervals on the cables; the grounding output interface of the second circulation pump motor 216 is grounded.

[0055] The N output interface of the dual power automatic transfer switch 244 is connected in parallel with the first motor protection branch and the second motor protection branch; the other end of the first motor protection branch and the second motor protection branch is connected in parallel with the W output interface of the dual power automatic transfer switch 244, and an air switch QF3 is installed on the connecting cable.

[0056] The first motor protection branch includes the following components connected in series on the cable: motor protector auxiliary contact FH1, AC contactor coil KM1, AC contactor auxiliary contact KM2, push button SB2, AC contactor auxiliary contact KM1, and motor protector auxiliary contact FH2.

[0057] In one specific embodiment, a button SB1 is provided on the auxiliary contact KM1 of the AC contactor to facilitate manual intervention by the operator as needed.

[0058] In one specific embodiment, a button SB3 is provided on the auxiliary contact KM2 of the AC contactor to facilitate manual intervention by the operator as needed.

[0059] The second motor protection branch includes the following components connected in series on the cable: motor protector auxiliary contact FH2, AC contactor coil KM2, AC contactor auxiliary contact KM1, push button SB4, AC contactor auxiliary contact KM2, and motor protector auxiliary contact FH1.

[0060] A liquid collection zone 124 is set at the bottom of the hydrogen sulfide absorption tower 1; the sodium sulfide generated in the liquid collection zone 124 dissolves into the alkaline absorption liquid and is used as a circulating spray liquid to continuously absorb hydrogen sulfide in the intake air.

[0061] The above circuitry enables automatic switching between main and backup operation of the fan and alkaline washing circulating pump; dual-circuit power supply ensures continuous system operation during power outages. This device effectively avoids the risk of single-point failure, guarantees 100% continuous treatment of H2S exhaust gas, and prevents leaks caused by delays due to manual intervention.

[0062] In one specific embodiment, when the alkali absorbent solution is saturated, the alkali absorbent solution is discharged into the sulfide absorbent liquid sealing tank 311, which is connected to the collection area 124 via a pipeline. When the sodium sulfide storage level reaches the discharge requirement, the sodium sulfide solution is discharged to the sulfide absorbent de-weighting tank via a pipeline. A sodium sulfide metering pump 312 is installed on the pipeline connecting the sulfide absorbent de-weighting tank and the sulfide absorbent liquid sealing tank 311 for quantitative discharge of the sodium sulfide solution. The sodium sulfide solution can be used for the recycling of the de-weighting agent or sold externally.

[0063] This device can prevent the leakage of harmful gases generated during continuous production, improve the reliability of production installation, and avoid serious safety accidents.

[0064] In one specific embodiment, the spray head 12 is an anti-clogging spray head. This device is suitable for the purification treatment of waste gas with high solid content. Specifically, considering the high solid content and high density of the phosphoric acid desulfurization tail gas, an anti-clogging spray head is used to prevent sodium sulfide crystallization and blockage.

[0065] In one specific embodiment, a safety design to prevent desorption is provided: a commercially available online pH monitor 315 is installed on the inner wall of the sulfide absorption liquid sealing tank 311. When the tester detects that the pH of the liquid in the tank is <8, alkali is automatically added to prevent acid from desorbing H2S.

[0066] This device solves the industry problems of easy clogging in high solids content exhaust gas treatment and easy secondary decomposition of by-products, achieving a dual improvement in safety and efficiency.

[0067] In one specific embodiment, it includes: an absorbent valve 11; the absorbent valve 11 is disposed on the pipeline connecting the inlet of the hydrogen sulfide absorption tower 1 and the sodium hydroxide absorbent storage tank.

[0068] In one specific embodiment, the system includes: a collecting fan 14; and a pipeline connecting the exhaust port of the production plant for removing phosphoric acid impurities from phosphorus pentasulfide to the inlet of the hydrogen sulfide absorption tower 1, with the collecting fan 14 installed on the connected pipeline.

[0069] In one specific embodiment, the system includes: a pair of control valves 231; control valves 231 are respectively installed on the inlet pipe and the outlet pipe of the first absorbent circulation pump 211 to control the inlet and outlet of the first absorbent circulation pump 211.

[0070] In one specific embodiment, it includes: a pair of control valves 231; control valves 231 are respectively installed on the inlet pipe and the outlet pipe of the second absorbent circulation pump 212 to control the inlet and outlet of the second absorbent circulation pump 212.

[0071] In one specific embodiment, a first exhaust gas exhaust fan 221 is installed on a third branch pipe; the third branch pipe is connected to an exhaust pipe; control valves 231 are respectively installed on the inlet and outlet pipes of the first exhaust gas exhaust fan 221; a second exhaust gas exhaust fan 222 is installed on a fourth branch pipe; the fourth branch pipe is connected to an exhaust pipe; control valves 231 are respectively installed on the inlet and outlet pipes of the second exhaust gas exhaust fan 222.

[0072] The exhaust pipe includes: a first section and a second section; the first section is connected to one end of the third and fourth branch pipes; the second section is connected to the other end of the third and fourth branch pipes; a first pressure gauge 232 is installed on the first section; a second pressure gauge 233 is installed on the second section. The other end of the first section is connected to the exhaust port of the hydrogen sulfide absorption tower 1; the other end of the second section is connected to the exhaust stack 3.

[0073] By setting up the first pressure gauge 232 and the second pressure gauge 233, operators can easily control the intake and exhaust of the first exhaust gas fan 221 and the second exhaust gas fan 222 based on the pressure changes at both ends, ensuring the reliability of continuous processing.

[0074] In one specific embodiment, the system includes: a sulfide absorption liquid transfer pump 312 and a pair of control valves 231; the outlet of the sulfide absorption liquid sealing tank 311 is connected to the deweighting tank pipeline, and the sulfide absorption liquid transfer pump 312 is installed on the connecting pipeline; control valves 231 are installed on the inlet and outlet pipelines of the sulfide absorption liquid transfer pump 312. This effectively discharges the sodium sulfide solution.

[0075] In one specific embodiment, it includes: a stirrer 31; the stirrer 31 is disposed in the liquid seal tank 311 of the sulfide absorption liquid, and is used for periodic stirring to promote uniform mixing of the pH adjusting substance and the sodium sulfide solution.

[0076] In one specific embodiment, it includes: a cyclone demister 246; a cyclone demister 246 is installed on the upper part of the spray head 12 inside the hydrogen sulfide absorption tower 1, which can effectively separate entrained solid particles.

[0077] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A purification device for hydrogen sulfide-containing gas generated during the dephosphorylation of phosphorus pentasulfide, characterized in that, include: Hydrogen sulfide absorption tower (1), first absorbent circulation pump (211), second absorbent circulation pump (212), first tail gas exhaust fan (221), second tail gas exhaust fan (222), sulfide absorbent liquid seal tank (311), exhaust stack (3); A hydrogen sulfide gas collection pipe is installed on the inlet of the hydrogen sulfide absorption tower (1); a spray head (12) is installed at the top of the hydrogen sulfide absorption tower (1); one end of the circulation main pipe is connected to the circulation liquid port of the hydrogen sulfide absorption tower (1), and the other end is connected to the spray head (12); the circulation main pipe is connected to the first branch pipe and the second branch pipe respectively. A first absorbent circulation pump (211) is installed on the first branch pipe; a second absorbent circulation pump (212) is installed on the second branch pipe. The top of the hydrogen sulfide absorption tower (1) is provided with an exhaust port, which is connected to the exhaust stack (3) through an exhaust pipe. The exhaust pipe is connected to the third branch pipe and the fourth branch pipe respectively. The first tail gas exhaust fan (221) is installed on the third branch pipe; the second tail gas exhaust fan (222) is installed on the fourth branch pipe. The liquid collection area (124) at the bottom of the hydrogen sulfide absorption tower (1) is connected to the liquid seal tank (311) of the sulfide absorption liquid via pipeline.

2. The purification device for generating hydrogen sulfide-containing gas during the phosphorus pentasulfide dephosphorylation impurity process according to claim 1, characterized in that, The first absorbent circulation pump (211) includes: a first circulation pump power supply (213), a first circulation pump motor (215), and a dual power supply automatic transfer switch (244); the first circulation pump power supply (213) is electrically connected to the first set of input terminals of the dual power supply automatic transfer switch (244); The second absorbent circulation pump (212) includes: a second circulation pump power supply (214) and a second circulation pump motor (216); the second circulation pump power supply (214) is electrically connected to the second set of input terminals of the dual power supply automatic switch (244); the first circulation pump motor (215), the second circulation pump motor (216) and the output terminals of the dual power supply automatic switch (244) are electrically connected in parallel.

3. The purification device for generating hydrogen sulfide-containing gas during the phosphorus pentasulfide dephosphorylation impurity process according to claim 1, characterized in that, The first exhaust gas fan (221) includes: a first AC motor (243), a first fan power supply (241), and a dual power supply automatic transfer switch (244); the first fan power supply (241) is electrically connected to the first set of input terminals of the dual power supply automatic transfer switch (244); The second exhaust gas exhaust fan (222) includes: a second AC motor (245) and a second fan power supply (242); the second fan power supply (242) is electrically connected to the second set of output terminals of the dual power automatic transfer switch (244); The first AC motor (243), the second AC motor (245), and the output terminals of the dual power supply automatic transfer switch (244) are connected in parallel.

4. The purification device for generating hydrogen sulfide-containing gas during the phosphoric acid removal process of phosphorus pentasulfide according to claim 1, characterized in that, include: Multiple control valves (231); control valves (231) are respectively installed on the inlet pipe and outlet pipe of the first absorbent circulation pump (211); control valves (231) are respectively installed on the inlet pipe and outlet pipe of the second absorbent circulation pump (212).

5. The purification device for generating hydrogen sulfide-containing gas during the phosphoric acid removal process of phosphorus pentasulfide according to claim 1, characterized in that, include: Multiple control valves (231); control valves (231) are respectively installed on the inlet pipe and outlet pipe of the first exhaust gas fan (221); control valves (231) are respectively installed on the inlet pipe and outlet pipe of the second exhaust gas fan (222).

6. The purification device for generating hydrogen sulfide-containing gas during the phosphoric acid removal process of phosphorus pentasulfide according to claim 5, characterized in that, include: First pressure gauge (232), second pressure gauge (233); exhaust pipe includes: first section and second section; The first section is connected to one end of the third and fourth branch pipes; the second section is connected to the other end of the third and fourth branch pipes; a first pressure gauge (232) is installed on the first section; a second pressure gauge (233) is installed on the second section; the other end of the first section is connected to the exhaust port of the hydrogen sulfide absorption tower (1); the other end of the second section is connected to the exhaust stack (3).

7. The purification device for generating hydrogen sulfide-containing gas during the phosphoric acid removal process of phosphorus pentasulfide according to claim 1, characterized in that, The bottom drain of the exhaust pipe (3) is connected to the liquid seal tank (311) of the sulfur absorption liquid.

8. The purification device for hydrogen sulfide-containing gas generated during the phosphorus pentasulfide dephosphorylation impurity process according to claim 1, characterized in that, include: The sulfide absorption liquid transfer pump (312), agitator (31), and pH online monitor (315) are provided. The drain port of the sulfide absorption liquid sealing tank (311) is connected to the deweight tank, and the sulfide absorption liquid transfer pump (312) is installed on the connecting pipeline. A stirrer (31) is installed inside the liquid seal tank (311) for the sulfur absorption liquid. A pH online monitor (315) is installed on the inner wall of the sulfur absorption liquid sealing tank (311).

9. The purification device for generating hydrogen sulfide-containing gas during the phosphoric acid removal process of phosphorus pentasulfide according to claim 1, characterized in that, The spray head (12) is an anti-clogging spray head.

10. The purification device for hydrogen sulfide-containing gas generated during the phosphoric acid removal process of phosphorus pentasulfide according to claim 1, characterized in that, include: Cyclone demister (246); A cyclone demister (246) is installed on the upper part of the spray head (12) inside the hydrogen sulfide absorption tower (1).

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