A preparation system for preparing lithium sulfide based on hydrogen sulfide gas recycling

Abstract

The utility model discloses a kind of preparation system of lithium sulfide preparation based on hydrogen sulfide gas recycling, comprising: hydrogen sulfide gas generating device, for generating hydrogen sulfide gas;First gas drying device, for drying hydrogen sulfide gas generated by the hydrogen sulfide gas generating device;Pipe furnace, for the hydrogen sulfide gas after drying of the first gas drying device and lithium source reaction generation lithium sulfide;Second gas drying device, for drying unreacted hydrogen sulfide gas in the pipe furnace.The utility model passes through hydrogen sulfide gas recycling, significantly improve the utilization of hydrogen sulfide gas, reduce raw material cost;At the same time, through the drying and recycling of hydrogen sulfide gas, reduce the influence of water vapor on reaction, improve the purity of lithium sulfide;In addition, hydrogen sulfide gas recycling, hydrogen sulfide gas direct emission, reduce the pollution to environment, and environmental protection is better.

Description

Technical Field

[0001] This invention relates to the field of lithium compound synthesis, and particularly to an apparatus for preparing lithium sulfide. Background Technology

[0002] In the current field of chemical synthesis, lithium sulfide (Li₂S) is an important inorganic compound, showing broad application potential in various fields such as battery materials, optoelectronic materials, and catalysts. Currently, the main methods for synthesizing lithium sulfide include solid-phase methods, carbothermal reduction methods, liquid-phase methods, ball milling methods, and hydrogen sulfide gas-solid synthesis methods, among others.

[0003] The solid-phase method refers to the chemical reaction between elemental sulfur and elemental lithium under high temperature and pressure. This method produces no waste gas and can significantly shorten the production process. However, its production cost is relatively high, and the process requires strict control of high temperature and pressure, placing high demands on equipment selection. Furthermore, the operating conditions are difficult to control, making large-scale production difficult in practice. The carbothermic reduction method involves reducing lithium salts to Li₂S using a carbon source at high temperature under inert gas protection. However, this method still faces problems such as low conversion rate and difficulty in controlling product purity, affecting its practical application. The liquid-phase method involves mixing lithium salts in an organic solvent while simultaneously introducing hydrogen sulfide gas. After reaction under heating, impurities are removed to obtain high-purity Li₂S. This method avoids the high-temperature sintering process and reduces energy consumption; however, the organic solvent used is toxic, and H₂S gas is also used during the reaction, both of which are harmful gases. Leaks can easily cause injury or death, thus placing high demands on equipment selection and subsequent recycling and treatment. Room temperature mechanical ball milling is a common method for preparing sulfide solid electrolytes. It is simple and relatively low in cost. It is generally believed that fine powder can increase the specific surface area of ​​lithium sulfide, shorten the lithium ion diffusion distance, and enable high ionic conductivity. However, the biggest drawback of ball milling is the lack of precise control, which results in poor uniformity of particle size and morphology.

[0004] In contrast, the hydrogen sulfide gas-solid synthesis method was once considered a promising synthesis method due to its relatively low reaction temperature and high conversion rate. However, traditional hydrogen sulfide gas-solid synthesis methods suffer from problems such as low utilization of hydrogen sulfide gas, direct emission of unreacted gas leading to resource waste and environmental pollution, and water vapor generated during the reaction affecting reaction efficiency and reducing product purity.

[0005] Therefore, it is of great significance to develop a lithium sulfide preparation system that has high hydrogen sulfide gas utilization, high reaction efficiency, and is environmentally friendly. Utility Model Content

[0006] The technical problem to be solved by this utility model is to overcome the deficiencies and defects mentioned in the background art above, and to provide a preparation system for preparing lithium sulfide based on the recycling of hydrogen sulfide gas, thereby solving the problems of low utilization rate of hydrogen sulfide gas, poor reaction efficiency, and serious environmental pollution in the prior art.

[0007] To solve the above-mentioned technical problems, the technical solution proposed in this utility model application is as follows: A preparation system for lithium sulfide based on the recycling of hydrogen sulfide gas, comprising: A hydrogen sulfide gas generating device for generating hydrogen sulfide gas; A first gas drying device is used to dry the hydrogen sulfide gas generated by the hydrogen sulfide gas generating device; the outlet of the hydrogen sulfide gas generating device is connected to the inlet of the first gas drying device. A tubular furnace is used to react hydrogen sulfide gas dried by the first gas drying device with a lithium source to generate lithium sulfide; the outlet of the first gas drying device is connected to the inlet of the tubular furnace. A second gas drying device is used to dry unreacted hydrogen sulfide gas in the tubular furnace; the tail gas outlet of the tubular furnace is connected to the inlet of the second gas drying device, and the outlet of the second gas drying device is connected to the inlet of the tubular furnace.

[0008] Preferably, the above preparation system further includes: A heat exchange device is used to cool the exhaust gas discharged from the tail gas outlet of the tubular furnace and utilize the waste heat. The exhaust gas enrichment device is used to increase the concentration of hydrogen sulfide gas used in recycling; The unreacted hydrogen sulfide gas discharged from the tail gas outlet of the tubular furnace is successively heat-exchanged by the heat exchange device and concentrated by the tail gas enrichment device before being connected to the inlet of the second gas drying device.

[0009] In the above preparation system, preferably, the heat exchange device includes a first heat exchange component, which is located at the tail gas outlet of the tubular furnace and is used to absorb the heat of the tail gas discharged from the tail gas outlet of the tubular furnace and heat the nitrogen gas.

[0010] In the above preparation system, preferably, the tail gas enrichment device includes an adsorber. Unreacted hydrogen sulfide gas in the tubular furnace, which has been treated by the heat exchange device, enters the adsorber for adsorption and enrichment. The adsorber is connected to the first heat exchange component. Nitrogen gas used for heating the first heat exchange component is introduced into the adsorber to desorb the enriched hydrogen sulfide gas. The adsorber is also connected to a room-temperature nitrogen gas pipeline for cooling after desorption. The cooling nitrogen gas outlet of the adsorber is connected to a cooler.

[0011] In the above preparation system, preferably, the adsorber includes a first adsorber and a second adsorber used alternately, with the first adsorber and the second adsorber arranged side by side.

[0012] In the above preparation system, preferably, the heat exchange device further includes a second heat exchange component, which is located downstream of the first heat exchange component and is used to absorb the heat of the exhaust gas discharged from the exhaust gas outlet of the tubular furnace for a second time, and to heat the hydrogen sulfide gas introduced into the tubular furnace.

[0013] In the above preparation system, preferably, the outlet of the first gas drying device is provided with a first pressure transmitter, and the outlet of the second gas drying device is provided with a gas compression and boosting device and a second pressure transmitter, and the first pressure transmitter, the gas compression and boosting device and the second pressure transmitter are signal interlocked.

[0014] In the above preparation system, preferably, the exhaust gas outlet of the tubular furnace is equipped with a moisture detector.

[0015] Preferably, the above preparation system further includes a tail gas treatment device, wherein the tail gas outlet of the tubular furnace is provided with a first branch and a second branch, the first branch is connected to the second gas drying device, and the second branch is connected to the tail gas treatment device.

[0016] In the above preparation system, preferably, the hydrogen sulfide gas generating device is a reaction vessel, which is connected to a sulfuric acid pipeline and a nitrogen pipeline, and has a by-product outlet pipeline at the bottom of the reaction vessel, and a stirring assembly inside the reaction vessel.

[0017] In the above preparation system, preferably, The preparation system for preparing lithium sulfide based on the recycling of hydrogen sulfide gas of this invention mainly involves the following processes: 1. Generation of hydrogen sulfide gas: In the hydrogen sulfide gas generating device, ferrous sulfide (FeS) reacts with dilute sulfuric acid (H2SO4) to generate hydrogen sulfide gas (H2S).

[0018] The reaction equation is: .

[0019] 2. Drying of hydrogen sulfide gas: The generated hydrogen sulfide gas is dried using a first gas drying device to remove water vapor from the gas.

[0020] 3. Preparation of lithium sulfide: The dried hydrogen sulfide gas is passed into a tube furnace containing anhydrous lithium hydroxide (LiOH) and reacted at 200-300℃ to produce lithium sulfide (Li2S).

[0021] The reaction equation is: .

[0022] 4. Gas recycling: The unreacted hydrogen sulfide gas discharged from the reactor outlet is heat-recovered, then dried again by a second gas drying device, and then recycled back into the reactor until the reaction is complete.

[0023] 5. Exhaust gas treatment: Unreacted hydrogen sulfide gas is treated by a tail gas treatment device to avoid environmental pollution.

[0024] Compared with the prior art, the advantages of this utility model are: This invention discloses a lithium sulfide preparation system based on the recycling of hydrogen sulfide gas. By recycling hydrogen sulfide gas, the utilization rate of hydrogen sulfide gas is significantly improved, and the raw material cost is reduced. At the same time, by drying and recycling hydrogen sulfide gas, the influence of water vapor on the reaction is reduced, and the purity of lithium sulfide is improved. In addition, the recycling of hydrogen sulfide gas and its direct emission reduce environmental pollution and make it more environmentally friendly. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the preparation system for preparing lithium sulfide based on the recycling of hydrogen sulfide gas according to this invention.

[0027] Legend: 1. Hydrogen sulfide gas generating device; 2. First gas drying device; 3. Tube furnace; 4. Second gas drying device; 5. Tail gas treatment device; 6. Moisture detector; 7. First heat exchange assembly; 8. Cooler; 9. First adsorber; 10. Second adsorber; 11. Second heat exchange assembly; 12. First pressure transmitter; 13. Gas compression and booster device; 14. Second pressure transmitter. Detailed Implementation

[0028] To facilitate understanding of this utility model, it will be described more comprehensively and in detail below with reference to the accompanying drawings and preferred embodiments. However, the scope of protection of this utility model is not limited to the following specific embodiments.

[0029] It should be noted that when a component is described as being "fixed to, attached to, connected to or connected to" another component, it can be directly fixed to, attached to, connected to or connected to the other component, or it can be indirectly fixed to, attached to, connected to or connected to the other component through other intermediate connectors.

[0030] Unless otherwise defined, all technical terms used herein have the same meaning as commonly understood by those skilled in the art. The technical terms used herein are for the purpose of describing particular embodiments only and are not intended to limit the scope of protection of this invention.

[0031] Unless otherwise specified, all raw materials, reagents, instruments and equipment used in this invention can be purchased from the market or prepared by existing methods.

[0032] Example: like Figure 1 As shown, the lithium sulfide preparation system based on hydrogen sulfide gas recycling in this embodiment includes: Hydrogen sulfide gas generating device 1 is used to generate hydrogen sulfide gas; specifically, it can be a reaction vessel in which ferrous sulfide (FeS) reacts with dilute sulfuric acid (H2SO4) to generate hydrogen sulfide gas (H2S), and the by-product ferrous sulfate is discharged through the by-product outlet pipe at the bottom of the reaction vessel. The reaction vessel is equipped with a stirring component. The first gas drying device 2 is used to dry the hydrogen sulfide gas generated by the hydrogen sulfide gas generating device 1; the outlet of the hydrogen sulfide gas generating device 1 is connected to the inlet of the first gas drying device 2; the first gas drying device 2 can use concentrated sulfuric acid or molecular sieves for drying. The tubular furnace 3 is used to react the hydrogen sulfide gas dried by the first gas drying device 2 with the lithium source to generate lithium sulfide; the outlet of the first gas drying device 2 is connected to the inlet of the tubular furnace 3; the tubular furnace 3 has a reaction chamber, which is heated by a heating component, and the tubular furnace 3 is equipped with a lithium sulfide product outlet pipeline. The second gas drying device 4 is used to dry the unreacted hydrogen sulfide gas in the tubular furnace 3; the outlet of the second gas drying device 4 is connected to the inlet of the tubular furnace 3; the second gas drying device 4 can use concentrated sulfuric acid or molecular sieves for drying. The heat exchange device is used to cool the exhaust gas discharged from the tail gas outlet of the tubular furnace 3 and utilize the waste heat; that is, it is used to recover the heat of the high-temperature hydrogen sulfide gas (about 250°C) generated by the tubular furnace 3, preheat nitrogen for high-temperature desorption, and preheat the hydrogen sulfide gas entering the tubular furnace 3 for reaction, thereby reducing energy consumption. The exhaust gas enrichment device is used to increase the concentration of hydrogen sulfide gas used in recycling; The unreacted hydrogen sulfide gas discharged from the tail gas outlet of the tubular furnace 3 is successively heated by a heat exchange device and concentrated by a tail gas enrichment device before being connected to the inlet of the second gas drying device 4.

[0033] In this embodiment, the heat exchange device includes a first heat exchange component 7 and a second heat exchange component 11. The first heat exchange component 7 is located at the tail gas outlet of the tubular furnace 3 and is used to absorb the heat from the tail gas discharged from the tail gas outlet of the tubular furnace 3 and to heat the nitrogen gas. The second heat exchange component 11 is located downstream of the first heat exchange component 7 and is used to absorb the heat from the tail gas discharged from the tail gas outlet of the tubular furnace 3 and to heat the hydrogen sulfide gas introduced into the tubular furnace 3.

[0034] In this embodiment, the tail gas enrichment device includes an adsorber. Unreacted hydrogen sulfide gas in the tubular furnace 3, which has been treated by the heat exchange device, enters the adsorber for adsorption and enrichment. The adsorber is connected to the first heat exchange component 7. Nitrogen gas used for heating the first heat exchange component 7 is introduced into the adsorber to desorb the enriched hydrogen sulfide gas. The adsorber is also connected to a room temperature nitrogen gas pipeline for cooling after desorption. The cooling nitrogen gas outlet of the adsorber is connected to a cooler 8.

[0035] In this embodiment, specifically, the adsorber includes a first adsorber 9 and a second adsorber 10 used alternately, with the first adsorber 9 and the second adsorber 10 arranged side by side.

[0036] In this embodiment, the first heat exchange component 7 and the second heat exchange component 11 are preferably shell-and-tube heat exchangers, with the high-temperature exhaust gas flowing through the shell side. The first adsorber 9 and the second adsorber 10 are preferably temperature-switching adsorption (TSA) systems.

[0037] In this embodiment, the outlet of the first gas drying device 2 is equipped with a first pressure transmitter 12, and the outlet of the second gas drying device 4 is equipped with a gas compression and boosting device 13 and a second pressure transmitter 14. The first pressure transmitter 12, the gas compression and boosting device 13, and the second pressure transmitter 14 are signal-interlocked. The gas compression and boosting device 13 is used to boost the pressure of the gas dried by the second gas drying device 4, and through the signal interlocking of the first pressure transmitter 12, the gas compression and boosting device 13, and the second pressure transmitter 14, the pressure of the gas dried by the second gas drying device 4 can be made consistent with the gas pressure after the first gas drying device 2. The first pressure transmitter 12 is located upstream of the second regulating valve, and the gas compression and boosting device 13 and the second pressure transmitter 14 are located upstream of the second check valve. For the specific positional relationship, please refer to [reference needed]. Figure 1 .

[0038] In this embodiment, a moisture detector 6 is installed at the exhaust outlet of the tubular furnace 3. A second switching valve and a third switching valve are respectively installed on the first and second branches. The moisture detector 6, the tubular furnace 3, and the second and third switching valves are interlocked. The moisture detector 6 can determine the reaction progress within the tubular furnace 3. The interlocking of the moisture detector 6, the tubular furnace 3, and the second and third switching valves allows for adjustment of heating within the tubular furnace 3 based on the reaction progress, and adjustment of the opening and closing of the second and third switching valves. For example, if the reaction within the tubular furnace 3 is incomplete, the exhaust gas needs to be recycled. The second switching valve is opened, the third switching valve is closed, and the tubular furnace 3 continues to heat to maintain the reaction temperature. The exhaust gas is then connected to the second gas drying device 4 via the first branch for drying and returned to the tubular furnace 3 for recycling. Conversely, if the reaction within the tubular furnace 3 is complete, the tubular furnace 3 stops operating, the second switching valve is closed, the third switching valve is opened, and the exhaust gas is connected to the exhaust gas treatment device 5 via the second branch for exhaust gas recovery.

[0039] In this embodiment, a tail gas treatment device 5 is also included. The tail gas outlet of the tubular furnace 3 is branched into a first branch and a second branch. The first branch is connected to a second gas drying device 4, and the second branch is connected to the tail gas treatment device 5. The tail gas treatment device 5 is used to absorb the final tail gas from the reaction, and alkaline solution can be used for absorption. The tail gas discharged from the tubular furnace 3 can be divided into two paths. When the reaction is incomplete, the tail gas is connected to the second gas drying device 4 through the first branch for drying and reuse. When the reaction is complete, the tail gas is connected to the tail gas treatment device 5 through the second branch to achieve tail gas recovery and avoid direct emission and environmental pollution.

[0040] In this embodiment, a sulfuric acid pipeline is connected to the hydrogen sulfide gas generating device 1. A first regulating valve and a first quantitative flow meter are sequentially installed on the sulfuric acid pipeline according to the material flow direction. The first regulating valve and the first quantitative flow meter are signal interlocked. This signal interlock is used to automatically adjust the sulfuric acid feed flow rate according to a set value, that is, to precisely control the amount of sulfuric acid added based on the amount of ferrous sulfate inside the reactor.

[0041] In this embodiment, the outlet of the first gas drying device 2 is equipped with a second regulating valve and a second quantitative flow meter in sequence according to the material flow direction. The second regulating valve and the second quantitative flow meter are interlocked to automatically regulate the flow rate of hydrogen sulfide entering the tubular furnace 3 for reaction, ensuring a stable feed flow rate.

[0042] In this embodiment, the outlets of the first gas drying device 2 and the second gas drying device 4 are respectively equipped with a first check valve and a second check valve. The first check valve and the second check valve are used to prevent the dried gas from flowing back into the drying device.

[0043] In this embodiment, a nitrogen pipeline is connected to the hydrogen sulfide gas generating device 1. A first switching valve is installed on the nitrogen pipeline, and this valve is interlocked with the tubular furnace 3. The nitrogen pipeline provides an inert environment for the entire preparation system initially and also discharges any residual hydrogen sulfide gas to the tail gas treatment device 5 after the reaction. The interlock between the first switching valve and the tubular furnace 3 ensures that all tail gas is discharged from the preparation system after the reaction is terminated, and also prevents accidental discharge of high-temperature hydrogen sulfide gas.

[0044] The process flow of the lithium sulfide preparation system based on hydrogen sulfide gas recycling in this embodiment is briefly described as follows: First, pre-weighed ferrous sulfide is added to the reaction chamber of the reactor, and pre-weighed anhydrous lithium hydroxide is added to the reaction chamber of the tube furnace 3 as the main raw materials for the reaction.

[0045] Subsequently, the first switch valve is activated to introduce nitrogen gas into the device until the moisture detector 6 detects that the moisture content is lower than the set value. Then, the first switch valve is closed, at which point there is no air interference reaction in the device.

[0046] Next, the value of the first quantitative flow meter is set, and the first regulating valve automatically adjusts its opening according to the interlock. To ensure the full progress of the reaction, the set flow rate is not simply the theoretical value calculated based on the chemical reaction equation, but rather, based on a comprehensive consideration of reaction efficiency and utilization rate, the actual supply is set to 1.2 to 2.0 times the theoretical value to avoid incomplete reaction.

[0047] Next, the tubular furnace 3 is started, and the temperature inside its reaction chamber is heated to 250°C. The reaction continues until the moisture content, detected by the moisture detector 6, falls below the set value, at which point the interlock stops the process. The exhaust gas generated in the tubular furnace 3 mainly contains unreacted hydrogen sulfide. The exhaust gas passes sequentially through the moisture detector 6, the first heat exchange component 7, and the second heat exchange component 11 for heat recovery. After cooling, the exhaust gas undergoes adsorption in the adsorbers, which include a first adsorber 9 and a second adsorber 10. These two adsorbers are used alternately; for example, adsorption occurs first in the first adsorber 9, while the second adsorber 10 performs high-temperature removal of hydrogen sulfide and cooling. The alternation of these two adsorbers is controlled by valves. For specific valve settings and gas flow direction, please refer to [link to relevant documentation]. Figure 1During the high-temperature removal of hydrogen sulfide from the second adsorber 10, hot nitrogen gas is used. This hot nitrogen gas comes from nitrogen gas heated by the first heat exchange component 7. The hot nitrogen gas desorbs the hydrogen sulfide adsorbed in the previous cycle, resulting in high-concentration (>95%) hydrogen sulfide gas, which is then sent to the second gas drying unit 4. After removal, the second adsorber 10 is purged and cooled with room-temperature nitrogen gas to prepare for the next round of adsorption. The purging exhaust gas is cooled by the cooler 8 and then discharged, or discharged to the exhaust gas treatment unit 5. When the first adsorber 9 becomes saturated, the raw material gas is switched through a valve to enter the regenerated second adsorber 10 for adsorption. At the same time, the saturated first adsorber 9 is heated for desorption and cooled, and this cycle is repeated.

[0048] After being concentrated, the hydrogen sulfide gas enters the second gas drying device 4 and then re-enters the tubular furnace 3. The moisture content of the gas after passing through the second gas drying device 4 needs to be reduced to below 5 ppm. During this process, the value of the second quantitative flow meter is set, and the second regulating valve automatically adjusts the opening degree according to the interlock to ensure that the flow rate of hydrogen sulfide gas entering the tubular furnace 3 is stable, and to prevent large fluctuations in flow rate caused by the reuse of tail gas from affecting the reaction.

[0049] After drying, the gas is compressed and boosted by the gas compression device 13 to make its pressure consistent with the gas pressure at the outlet of the first gas drying device 2, so that this part of the tail gas can be smoothly reintroduced into the tubular furnace 3, realizing the recycling of hydrogen sulfide gas and greatly improving the utilization rate of raw materials and the economy of the reaction.

[0050] If the moisture content measured by the moisture analyzer 6 is consistently below the threshold (typically less than 5 ppm) within a preset detection cycle (e.g., per hour), the reaction is considered to have reached its endpoint. At this point, the gas compression booster 13 is stopped, the supply of hydrogen sulfide gas is cut off, and the tubular furnace 3 is shut off to allow the reaction system to cool. Once the temperature inside the tubular furnace 3 has dropped to a safe operating range (below 50°C), the first switch valve is opened to introduce nitrogen gas, which replaces and discharges the residual hydrogen sulfide gas. Simultaneously, this displaced hydrogen sulfide gas can be recycled and reused to further improve resource utilization efficiency; or it can be directly connected to the tail gas treatment device 5 for treatment to prevent environmental pollution.

[0051] Finally, after the hydrogen sulfide replacement operation is completed, open the tubular furnace 3 to obtain the lithium sulfide product.

[0052] The lithium sulfide preparation system based on hydrogen sulfide gas recycling in this embodiment has the following advantages: 1. High efficiency: By recycling the gas, the utilization rate of hydrogen sulfide gas is significantly improved, and the cost of raw materials is reduced.

[0053] 2. Environmental friendliness: The exhaust gas treatment device 5 avoids the direct emission of hydrogen sulfide gas, reducing environmental pollution.

[0054] 3. Safety: The system employs a drying device and a sealed gas circulation system, with multiple interlocks to prevent accidents caused by human error, effectively reducing the safety risks of experimental operations.

[0055] 4. High product purity: Drying and recycling reduce the impact of water vapor on the reaction and improve the purity of lithium sulfide.

Claims

1. A preparation system for preparing lithium sulfide based on the recycling of hydrogen sulfide gas, characterized in that, include: Hydrogen sulfide gas generating device (1), used to generate hydrogen sulfide gas; A first gas drying device (2) is used to dry the hydrogen sulfide gas generated by the hydrogen sulfide gas generating device (1); the outlet of the hydrogen sulfide gas generating device (1) is connected to the inlet of the first gas drying device (2); A tubular furnace (3) is used to react hydrogen sulfide gas dried by the first gas drying device (2) with a lithium source to generate lithium sulfide; the outlet of the first gas drying device (2) is connected to the inlet of the tubular furnace (3); The second gas drying device (4) is used to dry the unreacted hydrogen sulfide gas in the tubular furnace (3); the tail gas outlet of the tubular furnace (3) is connected to the inlet of the second gas drying device (4), and the outlet of the second gas drying device (4) is connected to the inlet of the tubular furnace (3).

2. The preparation system according to claim 1, characterized in that, Also includes: A heat exchange device is used to cool the exhaust gas discharged from the tail gas outlet of the tubular furnace (3) and utilize the waste heat. The exhaust gas enrichment device is used to increase the concentration of hydrogen sulfide gas used in recycling; The unreacted hydrogen sulfide gas discharged from the tail gas outlet of the tubular furnace (3) is successively heated by the heat exchange device and concentrated by the tail gas enrichment device before being connected to the inlet of the second gas drying device (4).

3. The preparation system according to claim 2, characterized in that, The heat exchange device includes a first heat exchange component (7), which is located at the tail gas outlet of the tubular furnace (3) and is used to absorb the heat of the tail gas discharged from the tail gas outlet of the tubular furnace (3) and heat the nitrogen.

4. The preparation system according to claim 3, characterized in that, The tail gas enrichment device includes an adsorber. Unreacted hydrogen sulfide gas in the tubular furnace (3) treated by the heat exchange device enters the adsorber for adsorption and enrichment. The adsorber is connected to the first heat exchange component (7). Nitrogen gas used for heating the first heat exchange component (7) is introduced into the adsorber to desorb the enriched hydrogen sulfide gas. The adsorber is also connected to a room temperature nitrogen gas pipeline for cooling after desorption. The cooling nitrogen gas outlet of the adsorber is connected to a cooler (8).

5. The preparation system according to claim 4, characterized in that, The adsorber includes a first adsorber (9) and a second adsorber (10) used alternately, with the first adsorber (9) and the second adsorber (10) arranged side by side.

6. The preparation system according to claim 3, characterized in that, The heat exchange device further includes a second heat exchange component (11), which is located downstream of the first heat exchange component (7) and is used to absorb the heat of the exhaust gas discharged from the tail gas outlet of the tubular furnace (3) for a second time, and to heat the hydrogen sulfide gas introduced into the tubular furnace (3).

7. The preparation system according to claim 1, characterized in that, The outlet of the first gas drying device (2) is provided with a first pressure transmitter (12), and the outlet of the second gas drying device (4) is provided with a gas compression booster device (13) and a second pressure transmitter (14). The first pressure transmitter (12), the gas compression booster device (13) and the second pressure transmitter (14) are signal interlocked.

8. The preparation system according to claim 1, characterized in that, The exhaust gas outlet of the tubular furnace (3) is equipped with a moisture detector (6).

9. The preparation system according to claim 1, characterized in that, It also includes a tail gas treatment device (5), and the tail gas outlet end of the tubular furnace (3) is provided with a first branch and a second branch. The first branch is connected to the second gas drying device (4), and the second branch is connected to the tail gas treatment device (5).

10. The preparation system according to claim 1, characterized in that, The hydrogen sulfide gas generating device (1) is a reaction vessel. The reaction vessel is connected to a sulfuric acid pipeline and a nitrogen pipeline. The bottom of the reaction vessel is provided with a by-product outlet pipeline. The reaction vessel is equipped with a stirring assembly inside.

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