Thermal coupling circulating vulcanization device and process

Abstract

The invention relates to the technical field of shift catalyst presulfurization, in particular to a thermal coupling circulating sulfurization device and a thermal coupling circulating sulfurization process, the device comprises a preheating assembly used for introducing a mixed gas of N2 and H2S gas with a set concentration; the preheating assembly comprises a heater and a heat exchanger which are connected in sequence, and the heater and the heat exchanger respectively raise the temperature of the mixed gas to t1, t2 and t1lt; t2; the heating assembly is connected with the preheating assembly and used for receiving the mixed gas preheated by the preheating assembly and heating the mixed gas to t3 and t3gt; t2; the pre-vulcanization tower is connected with the heat exchanger; an outlet of the pre-vulcanization tower is communicated with the heat exchanger and is used for discharging high-temperature mixed gas after reaction into the preheating assembly to serve as a heat exchange heat source; the heat exchanger is further connected with the heater through a cooling circulation assembly so as to recycle N2 and H2S; according to the invention, the vulcanization and activity of the catalyst can be improved, the carbon deposition of the catalyst and the out-of-control reaction caused by too high temperature can be avoided, the driving process is simplified, and the production efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of transformation catalyst presulfurization, in particular to a heat-coupled circulating sulfurization device and process. BACKGROUND

[0002] Presulfurization of shift catalyst is one of the key technologies to obtain catalyst activity, improve shift activity, avoid catalyst over-temperature and coking, simplify start-up process, and improve economic benefits. Shift catalyst in oxidized state does not have activity. Only by presulfurizing the catalyst to convert the metal components from oxidized state to sulfided state, the catalyst has high activity and selectivity, strong resistance to toxicity, long service life, and can maximize the role of shift catalyst. The essence of presulfurization is to introduce sulfiding agent (such as hydrogen sulfide or sulfur-containing organic compounds) to make the metal oxides in the catalyst chemically react with sulfur to form metal sulfides. This process not only changes the chemical form of the metal components, but also restructures the surface structure of the catalyst, exposing more high-activity catalytic sites. The active center of the sulfided catalyst has stronger electron donation ability, which can more efficiently activate the reactant molecules, significantly improving the conversion rate and selectivity of the shift reaction. At the same time, sulfurization treatment can also enhance the resistance of the catalyst to impurities (such as organic sulfur, chloride ions, etc.) in the raw material gas, so as to maintain stable activity and prolong service life.

[0003] From the perspective of process safety, presulfurization can effectively avoid catalyst over-temperature and coking problems. The unsulfided catalyst may cause local overheating when it contacts high-temperature reaction gas, leading to uncontrolled temperature rise (over-temperature) of the catalyst bed, and then accelerating the sintering or coking of the catalyst, resulting in permanent deactivation. The sulfided catalyst has uniform activity distribution and releases reaction heat more smoothly, which can significantly reduce the risk of over-temperature. In addition, sulfurization treatment can also reduce the tendency of carbon deposition on the surface of the catalyst, avoiding the increase of pressure drop and the decrease of activity caused by carbon deposition. In terms of economic benefits, presulfurization technology directly reduces costs by simplifying the start-up process and shortening the time to reach production. The unsulfurized catalyst needs to be gradually heated and sulfided during the initial operation stage, which takes a long time (may take tens of hours), and the product gas quality is unstable during this period, which needs to be treated additionally. The use of presulfurized catalyst or online presulfurization process can significantly shorten the start-up time, reduce waste gas emissions, improve the stability of the device operation, and reduce the risk of unplanned shutdown.

[0004] At present, the pre-vulcanization adopts the in-vessel pre-vulcanization method, which can be divided into wet vulcanization and dry vulcanization according to different vulcanization heat carriers. The wet vulcanization, for example, the patent document with the authorization announcement number CN102049318B discloses a vulcanizing agent supply method for a catalyst wet vulcanization process. In the method, a hydrogen sulfide generation reactor is provided, and the vulcanizing agent and hydrogen enter the hydrogen sulfide generation reactor. The hydrogen and the vulcanizing agent generate a hydrogen sulfide-containing material under the reaction condition of generating hydrogen sulfide. The hydrogen sulfide-containing material and the starting oil are introduced into a hydrogenation reactor for the vulcanization treatment of the hydrogenation catalyst. The method is most suitable for the vulcanization process of the hydrogenation catalyst of the liquid-phase hydrogenation process. The hydrogen sulfide can be provided according to the needs of the vulcanization process, and the problems of slow decomposition of the vulcanizing agent and insufficient vulcanization of the catalyst caused by the limited amount of dissolved hydrogen in the catalyst vulcanization process of the liquid-phase hydrogenation process are solved.

[0005] The dry vulcanization can refer to the patent document with the application publication number CN118904012A, which discloses a hydrogen sulfide dry high-efficiency purification system and method. The system includes a shell and exhaust and intake pipes connected to the upper and lower ends of the shell, respectively. An adsorbent layer is arranged in the shell. A gas blocking assembly is installed in the shell above the adsorbent layer. The gas blocking assembly controls the gas flow rate by rotating to promote the full contact of the gas with the adsorbent layer. A hollow rod is rotatably arranged in the shell and fixedly connected to the upper side of the gas blocking assembly. The end sealing plate rotates with the hollow rod, and the second mesh surface on the end sealing plate and the first mesh surface on the bottom sealing plate gradually intersect to block the gas, control the flow rate of the gas, and make the gas stay in the adsorbent layer to fully contact with the adsorbent, thereby improving the quality of hydrogen sulfide purification.

[0006] Then, in actual production, the wet vulcanization has the disadvantages of long vulcanization time, much carbon deposition of the catalyst, low activity and stability of the catalyst with high metal content, strong corrosion, great toxicity, and difficult storage and transportation. Although the dry vulcanization mixes the vulcanizing agent and hydrogen together and then enters the catalyst bed layer to reduce the loss of the vulcanizing agent and avoid the metal corrosion of the inner surface of the pipe fittings of the upstream equipment of the reactor, the vulcanization process is completed quickly, a large amount of heat is released during the vulcanization process, the temperature in the reactor is too high, and the reaction is difficult to control. Therefore, it is necessary to design a heat-coupled circulating vulcanization device to solve the problems of the wet vulcanization and the dry vulcanization. SUMMARY

[0007] The present application provides a heat-coupled circulating vulcanization device to solve the above technical problems in the prior art. The purpose of the present application is also to provide a heat-coupled circulating vulcanization process using the above heat-coupled circulating vulcanization device.

[0008] To solve the above problems, the heat-coupled circulating vulcanization device provided by the present application adopts the following technical scheme: A heat coupling cycle vulcanization device comprises: a preheating assembly for passing mixed gas of N2 and H2S gas with a set concentration to preheat; the preheating assembly comprises a heater and a heat exchanger connected in sequence, the heater and the heat exchanger respectively raise the temperature of the mixed gas to t1 and t2, t1 < t2; a heating assembly connected with the preheating assembly, for receiving the mixed gas preheated by the preheating assembly and heating the mixed gas to t3, t3 > t2; a pre-vulcanization tower connected with the heat exchanger, for passing the mixed gas to carry out pre-vulcanization reaction; the outlet of the pre-vulcanization tower is communicated with the heat exchanger, for discharging the high-temperature mixed gas after reaction into the preheating assembly as a heat exchange heat source; the heat exchanger is further connected with the heater through a cooling circulation assembly to realize recycling of N2 and H2S.

[0009] The heat coupling cycle vulcanization device has the beneficial effects that: by arranging the preheating assembly, the heating assembly, the pre-vulcanization tower and the heat exchanger, the heat recycling is realized, the heater, the heat exchanger and the electric furnace realize the staged heating, the temperature of the mixed gas before entering the pre-vulcanization tower can be accurately controlled, the vulcanization reaction is ensured to be carried out in a relatively appropriate temperature range, which helps to improve the vulcanization and activity of the catalyst, and meanwhile, the catalyst coking and reaction out of control caused by excessively high temperature can be avoided, the starting process is simplified, and the production efficiency is improved; finally, the cooling circulation assembly can realize the recycling of N2 and H2S, and the emission of harmful gas is reduced; In summary, the present application improves and upgrades the existing vulcanization process, and solves the problems existing in the wet vulcanization and dry vulcanization in the prior art.

[0010] Further, the heater is a steam heater, and t1 is 170-180℃.

[0011] Further, the heat exchanger is a preheating exchanger, and t2 is 300-400℃.

[0012] Further, the heating assembly is an electric furnace, and t3 is 400-500℃.

[0013] Further, the heat exchanger has double channels, one channel is used for passing the mixed gas to flow into, and after heat exchange and temperature rise, the mixed gas flows to the heating assembly, and the other channel is used for passing the mixed gas discharged by the pre-vulcanization tower to flow out, and after heat exchange and temperature drop, the mixed gas flows to the cooling circulation assembly.

[0014] Further, the cooling circulation assembly comprises a cooler and a circulating machine, the cooler is communicated with the preheating exchanger to carry out secondary cooling on the mixed gas after heat exchange and temperature drop, and the circulating machine is communicated with the cooler and the heater.

[0015] Further, the mixed gas after circulating machine, a part of the gas into the lye absorption device to absorb the tail gas in the mixed gas, a part of the gas into the heater, recycling.

[0016] To solve the above problems, the heat coupling circulating vulcanization process provided by the application adopts the following technical scheme: A heat coupling circulating vulcanization process, which is realized by means of the heat coupling circulating vulcanization device in the above claims 1 to 7, comprising the following steps: S1: the mixed gas of N2 and H2S gas is introduced into the steam heater, and the mixed gas is heated to t1; S2: the mixed gas reaching t1 temperature enters the preheating exchanger, and continues to heat to t2; S3: the mixed gas reaching t2 temperature enters the electric furnace, and is heated to t3 again, and then is introduced into the pre-sulfurization tower for pre-sulfurization reaction; S4: the remaining mixed gas after pre-sulfurization reaction is introduced into the preheating exchanger again as a heat source, and exchanges heat with the mixed gas entering the preheating exchanger; S5: the mixed gas after heat exchange and cooling enters the cooler for secondary cooling; S6: after the temperature is reduced, the mixed gas is introduced into the circulating machine, and after the circulating machine, a part of the mixed gas enters the lye absorption device, and another part of the mixed gas is introduced into the steam heater again for recycling.

[0017] Further, the heater is a steam heater, and t1 is 170-180℃.

[0018] Further, the heat exchanger is a preheating exchanger, and t2 is 300-400℃.

[0019] Further, the heating assembly is an electric furnace, and t3 is 400-500℃.

[0020] Further, the heat exchanger has double channels, one channel is used for the mixed gas to flow in, and after heat exchange and heating, the mixed gas flows to the heating assembly, and the other channel is used for the mixed gas discharged from the pre-sulfurization tower to flow out, and after heat exchange and cooling, the mixed gas flows to the cooling circulating assembly.

[0021] Further, the cooling circulating assembly comprises a cooler and a circulating machine, the cooler is communicated with the preheating exchanger to perform secondary cooling on the mixed gas after heat exchange and cooling, and the circulating machine is communicated with the cooler and the heater.

[0022] Further, the gas after the circulating machine has a certain pressure, a part of the gas can enter the lye absorption device without external power to absorb the tail gas in the mixed gas; another part of the gas is connected with the heater for recycling.

[0023] The heat coupling circulation vulcanization process has the beneficial effects that: by arranging the preheating assembly, the heating assembly, the pre-vulcanization tower and the heat exchanger, the heat recycling is realized, the heater, the heat exchanger and the electric furnace realize the staged heating, the temperature of the mixed gas before entering the pre-vulcanization tower can be accurately controlled, the vulcanization reaction is ensured to be carried out in a relatively appropriate temperature range, the vulcanization and activity of the catalyst are improved, meanwhile, the catalyst carbon deposition and reaction out of control caused by excessively high temperature can be avoided, the starting process is simplified, and the production efficiency is improved; finally, the cooling circulation assembly can realize the recycling of N2 and H2S, and the emission of harmful gas is reduced. To sum up, the present vulcanization process is improved and upgraded, and the problems of the wet vulcanization and the dry vulcanization in the prior art are solved. BRIEF DESCRIPTION OF DRAWINGS

[0024] The above and other objects, features and advantages of the exemplary embodiments of the present application will be more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which several embodiments of the present application are shown by way of example, and wherein like reference numerals refer to like elements throughout. In the drawings: Fig. 1 It is a whole schematic view of the heat coupling circulation vulcanization device provided by the present application. Fig. 2 It is a schematic view of the lye absorption device in the present application. Fig. 3 It is a flow chart of the heat coupling circulation vulcanization process provided by the present application.

[0025] Explanation of reference numerals: 1, steam heater; 2, preheating exchanger; 3, electric furnace; 4, pre-vulcanization tower; 5, cooler; 6, circulating machine; 7, lye absorption device; 70, lye. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application, and those skilled in the art should know that the embodiments described below are part of the embodiments of the present disclosure, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0027] It should be noted that the main concept of the present invention is to achieve the recycling of heat by setting up a preheating component, a heating component, a pre-sulfurization tower, and a heat exchanger. The heater, the heat exchanger, and the electric furnace achieve hierarchical heating, which can precisely control the temperature of the mixed gas before entering the pre-sulfurization tower, ensure that the sulfurization reaction proceeds within a relatively appropriate temperature range, contribute to improving the sulfurization and activity of the catalyst, and at the same time can avoid catalyst carbon deposition and reaction runaway caused by too high temperature, simplify the startup process, and improve production efficiency.

[0028] Next, referring to several representative embodiments of the present invention, the principles and spirits of the present invention will be elaborated in detail.

[0029] An embodiment of the thermal coupling cyclic sulfurization device provided by the present invention: As Figs. 1 to 3 shown, the thermal coupling cyclic sulfurization device includes a preheating component, a heating component, a pre-sulfurization tower 4, and a cooling circulation component. Among them, the preheating component is used to introduce a mixed gas of N2 and H2S gas with a set concentration for preheating, and it includes a heater and a heat exchanger connected in sequence. The heater and the heat exchanger respectively raise the temperature of the mixed gas to t1 and t2, where t1 < t2. The heating component is connected to the preheating component and is used to receive the mixed gas pre-treated by the preheating component and heat the mixed gas to t3, where t3 > t2; the pre-sulfurization tower 4 is connected to the heat exchanger and is used to introduce the mixed gas for pre-sulfurization reaction; the outlet of the pre-sulfurization tower 4 is connected to the heat exchanger and is used to discharge the high-temperature mixed gas after the reaction into the preheating component as a heat exchange heat source; the heat exchanger is also connected to the heater through the cooling circulation component to achieve the recycling and reuse of N2 and H2S.

[0030] In this embodiment, the H2S content is 1000 - 6000 ppm. In other embodiments, the H2S content can also be adjusted according to actual needs.

[0031] In this embodiment, the heater is a steam heater 1, and t1 is 170 - 180 °C; the heat exchanger is a preheating exchanger 2, and t2 is 300 - 400 °C; the heating component is an electric furnace 3, and t3 is 400 - 500 °C. In other embodiments, the temperatures of t1, t2, and t3 can be adjusted according to actual needs, but it is necessary to ensure that t1 < t2 < t3 to achieve hierarchical heating.

[0032] The advantage of hierarchical heating is that, first, the steam heater 1 in the preheating component first heats the N2 and H2S mixed gas to t1 (170 - 180 °C). This preliminary heating process helps to remove some condensates in the mixed gas and raise the gas temperature to a range suitable for further processing, laying a foundation for subsequent efficient heating.

[0033] Secondly, the mixed gas enters the preheating exchanger 2 and is heated to t2 (300-400℃). This stage not only further increases the temperature of the gas, but also recovers the waste heat of the gas discharged from the presulfidation tower 4 through heat exchange, achieving efficient use of energy. Then, the heating assembly (electric furnace 3) heats the mixed gas to t3 (400-500℃), which is the optimal temperature interval required for the presulfidation reaction. The step-by-step heating avoids the temperature control difficulties and energy waste that may be caused by directly heating the gas from low temperature to high temperature. By gradually and accurately increasing the temperature of the gas, the electric furnace 3 can more stably and efficiently heat the mixed gas to the required temperature for the reaction, reducing the impact of temperature fluctuations on the activity of the catalyst and the presulfidation effect.

[0034] Finally, step-by-step heating also helps to reduce the thermal stress of the equipment and prolong the service life of the equipment. Since the temperature is gradually rising, the thermal shock on the equipment material is smaller, thereby reducing the risk of material fatigue and damage caused by thermal expansion and contraction.

[0035] In summary, step-by-step heating achieves efficient use of energy, precise control of reaction temperature, improvement of catalyst activity and stability, and prolongation of equipment service life in the entire device.

[0036] In this embodiment, the heat exchanger has two channels, one for the mixed gas to flow in and then to the heating assembly after being heated by the heat exchange, and the other for the mixed gas discharged from the presulfidation tower 4 to flow out and then to the cooling circulating assembly after being cooled by the heat exchange.

[0037] As shown in Fig. 1 and Fig. 2 , the cooling circulating assembly includes a cooler 5 and a circulating machine 6. The cooler 5 is connected to the preheating exchanger 2 to perform secondary cooling on the mixed gas after the heat exchange. The circulating machine 6 is connected to the cooler 5 and the heater.

[0038] After being processed by the circulating machine 6, part of the mixed gas enters the caustic lye absorption device 7, and the other part of the mixed gas is again introduced into the steam heater 1 for recycling. The caustic lye absorption device 7 has caustic lye 70 to absorb the tail gas in the mixed gas.

[0039] The working principle of the thermally coupled circulating vulcanization device provided by this invention is as follows: N2 and H2S gases are mixed in a set ratio and then enter the steam heater 1 of the preheating component, where they are initially heated to the t1 temperature range (170-180℃) to remove condensate and raise the temperature. Subsequently, the mixed gas flows into the preheating exchanger 2 and exchanges heat with the high-temperature gas discharged from the pre-vulcanization tower 4, raising the temperature to t2 (300-400℃), thus achieving preliminary heat recovery. Next, the mixed gas enters the electric furnace 3 for deep heating, reaching the t3 temperature (400-500℃) required for the pre-vulcanization reaction. Under high-temperature conditions, the hydrogen sulfide in the mixed gas comes into full contact with the catalyst, completing the pre-vulcanization process and converting the catalyst metal components from the oxidized state to the sulfided state, thereby improving the catalyst activity and selectivity. After the pre-vulcanization reaction, the remaining high-temperature mixed gas returns to the preheating exchanger 2 as a heat source to heat the newly entering mixed gas, achieving secondary heat recovery. The cooled mixed gas enters the cooling circulation assembly, where it is further cooled by cooler 5 before flowing into circulation machine 6. The gas processed by circulation machine 6 has a certain pressure; a portion of it can enter the alkali absorption device without external power to absorb the tail gas in the mixed gas; the other portion is connected to the heater for recycling. It should be noted that during this process, a new mixture of N2 and H2S can also be added to the steam heater 1. The entire process precisely controls the reaction temperature through staged heating, improves energy efficiency through heat recovery, and reduces emissions through recycling.

[0040] An embodiment of the thermally coupled cyclic vulcanization process provided by this invention: like Fig. 3 As shown, the thermally coupled cyclic vulcanization process mainly relies on the thermally coupled cyclic vulcanization device in the above embodiments, which includes the following steps: S1: The mixture of N2 and H2S gases is introduced into steam heater 1 to heat the mixture to t1; S2: The mixed gas that has reached temperature t1 enters the preheating exchanger 2 and continues to be heated to t2; S3: The mixed gas that has reached temperature t2 enters electric furnace 3, is heated again to t3, and then passes into pre-vulcanization tower 4 for pre-vulcanization reaction; S4: The remaining mixed gas after the pre-vulcanization reaction is fed back into the preheating exchanger 2 as a heat source to exchange heat with the mixed gas entering the preheating exchanger 2. S5: The mixed gas, after being cooled by heat exchange, enters cooler 5 for secondary cooling; S6: After the temperature drops, the mixed gas is fed into the circulation machine 6. After being processed by the circulation machine 6, part of the mixed gas enters the alkali absorption device 7, and the other part of the mixed gas is fed back into the steam heater 1 for recycling.

[0041] Specifically, the cooling circulation assembly includes a cooler 5 and a circulating machine 6, the cooler 5 is connected with the preheating exchanger 2 to perform secondary cooling on the mixed gas after heat exchange and cooling, and the circulating machine 6 is connected with the cooler 5 and the heater. After being processed by the circulating machine 6, part of the mixed gas enters the lye absorption device 7, and the other part of the mixed gas enters the steam heater 1 again for recycling, and the lye absorption device 7 has lye 70 to absorb tail gas in the mixed gas.

[0042] The working principle of the thermal coupling circulation vulcanization process provided by the application is as follows: N2 and H2S gas are mixed at a set ratio, enter the steam heater 1 of the preheating assembly, are preliminarily heated to the t1 temperature range (170-180℃), condensate is removed and the temperature is raised, then the mixed gas flows into the preheating exchanger 2, exchanges heat with high-temperature gas discharged from the presulfurization tower 4, the temperature is raised to t2 (300-400℃), and thermal energy is preliminarily recovered. Then, the mixed gas enters the electric furnace 3 for deep heating, and reaches the t3 temperature (400-500℃) required for the presulfurization reaction; in the high-temperature environment, hydrogen sulfide in the mixed gas fully contacts with the catalyst, the presulfurization process is completed, the catalyst metal component is converted from the oxidized state to the sulfided state, and the activity and selectivity of the catalyst are improved; after the presulfurization reaction, the remaining high-temperature mixed gas returns to the preheating exchanger 2 to heat the newly entered mixed gas as a heat source, and thermal energy is recovered for the second time. The cooled mixed gas enters the cooling circulation assembly, is further cooled by the cooler 5, and then flows into the circulating machine 6; part of the mixed gas enters the lye absorption device 7 and absorbs tail gas in the mixed gas by the lye 70; it should be noted that in this process, new mixed gas of N2 and H2S can also be supplemented into the steam heater 1, the whole process is accurately controlled by staged heating, thermal energy recovery improves energy efficiency, and recycling reduces emissions. In summary, the whole scheme solves the deficiencies of the existing wet vulcanization and dry vulcanization.

[0043] According to the above description of the present specification, those skilled in the art can also understand that the terms used such as "upper", "lower", "front", "back", "left", "right", "width", "horizontal", "top", "bottom", "inner", "outer" and the like indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the drawings of the present specification, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not mean or imply that the devices or elements involved must have the specific orientation, be constructed and operated in a specific orientation, therefore the above orientation or positional relationship terms cannot be understood or interpreted as a limitation on the present application.

[0044] In addition, in the description of the present specification, "a plurality of" means at least two, for example, two, three or more, etc., unless otherwise explicitly and specifically limited.

Claims

1. A thermally coupled cyclic vulcanization device, characterized in that, include: A preheating assembly is used to preheat a mixture of N2 and H2S gases of a set concentration. The preheating assembly includes a heater and a heat exchanger connected in sequence. The heater and heat exchanger respectively raise the temperature of the mixture to t1 and t2. <t2; A heating component, connected to the preheating component, is used to receive the mixed gas after preheating treatment by the preheating component and heat the mixed gas to t3, where t3>t2; A pre-vulcanization tower, which is connected to the heat exchanger, is used to introduce mixed gas for pre-vulcanization reaction; The outlet of the pre-sulfurization tower is connected to the heat exchanger, which is used to discharge the high-temperature mixed gas after the reaction into the preheating component as a heat source for heat exchange. The heat exchanger is also connected to the heater via a cooling circulation assembly to enable the recovery and reuse of N2 and H2S.

2. The thermally coupled cyclic vulcanizing apparatus according to claim 1, characterized in that: The heater is a steam heater, and t1 is 170-180℃.

3. The thermally coupled cyclic vulcanizing apparatus according to claim 2, characterized in that: The heat exchanger is a preheating exchanger, and t2 is 300-400℃.

4. The thermally coupled cyclic vulcanizing apparatus according to claim 3, characterized in that: The heating component is an electric furnace, and t3 is 400-500℃.

5. The thermally coupled cyclic vulcanizing apparatus according to any one of claims 1 to 4, characterized in that: The heat exchanger has two channels: one channel for the mixed gas to flow in, which flows to the heating component after heat exchange and heating, and the other channel for the mixed gas discharged from the pre-vulcanization tower to flow out, which flows to the cooling circulation component after heat exchange and cooling.

6. The thermally coupled cyclic vulcanizing apparatus according to any one of claims 1 to 4, characterized in that: The cooling circulation assembly includes a cooler and a circulator. The cooler is connected to the preheat exchanger to perform secondary cooling on the mixed gas after heat exchange and cooling. The circulator is connected to the cooler and the heater.

7. The thermally coupled cyclic vulcanizing apparatus according to claim 6, characterized in that: After the mixed gas passes through the circulator, a portion of the gas enters the alkaline absorption device to absorb the tail gas in the mixed gas, while the remaining gas enters the heater for recycling.

8. A thermally coupled cyclic vulcanization process, implemented using the thermally coupled cyclic vulcanization apparatus described in claims 1 to 7, comprising the following steps: S1: The mixture of N2 and H2S gases is passed into the steam heater and heated to t1; S2: The mixed gas that has reached temperature t1 enters the preheating exchanger and continues to be heated to t2; S3: The mixed gas that has reached temperature t2 enters the electric furnace, is reheated to t3, and then passes into the pre-vulcanization tower for pre-vulcanization reaction; S4: The remaining mixed gas after the pre-vulcanization reaction is fed back into the preheating exchanger as a heat source to exchange heat with the mixed gas entering the preheating exchanger. S5: The mixed gas, after being cooled by heat exchange, enters the cooler for secondary cooling; S6: After the temperature drops, the mixed gas is fed into the circulation machine. After passing through the circulation machine, part of the mixed gas enters the alkali absorption device, and the other part of the mixed gas is fed back into the steam heater for recycling.

9. The thermally coupled cyclic vulcanization process according to claim 8, characterized in that: The cooling circulation assembly includes a cooler and a circulator. The cooler is connected to the preheat exchanger to perform secondary cooling on the mixed gas after heat exchange and cooling. The circulator is connected to the cooler and the heater.

10. The thermally coupled cyclic vulcanization process according to claim 9, characterized in that: The gas after passing through the circulator has a certain pressure. Part of it can enter the alkaline absorption device without external power to absorb the tail gas in the mixed gas; the other part of the gas is connected to the heater for recycling.

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