High-efficiency liquid sulfur trap

Abstract

The invention relates to the technical field of petrochemical equipment, in particular to an efficient liquid sulfur catcher which comprises a tank, a heat transfer assembly and an air pressure detection assembly, the tank is provided with a cavity, an air inlet, an air outlet and a liquid sulfur outlet, and the air inlet, the air outlet and the liquid sulfur outlet are communicated with the cavity; the heat transfer assembly is arranged in the cavity and located in a gas passage between the gas inlet and the gas outlet, the heat transfer assembly is provided with a gas channel and a medium channel which can exchange heat with each other, the gas channel allows process gas to pass through, and the medium channel communicates with an external heat exchange medium; the air pressure detection assembly is arranged on the tank body and used for detecting the air pressure difference between the input end and the output end of the air channel. Wherein the temperature of the heat exchange medium is adjustable, and the efficient liquid sulfur trap provided by the invention can effectively avoid the problem of sulfur blockage, so that the gas-liquid separation effect is improved, and the service life of the device is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of petrochemical equipment, and particularly relates to a high-efficiency liquid sulfur trap. BACKGROUND

[0002] The liquid sulfur trap is an important device in a sulfur recovery unit, and is located at a boundary point between a sulfur production part and a tail gas part in the sulfur recovery unit. The function of the liquid sulfur trap is to further recover liquid sulfur from process gas at an outlet of a final condenser, so as to improve a sulfur recovery rate, reduce a tail gas treatment load, and prevent air pollution.

[0003] At present, a metal wire mesh type liquid sulfur trap is used in most sulfur recovery units. The trap has a simple structure, is a vertical container, has process gas entering from below and exiting from above, has a metal wire mesh trapping element arranged in the trap, and is used for trapping liquid sulfur. Steam tracing coils and a jacket are arranged outside the trap, so as to prevent liquid sulfur from solidifying due to excessively low temperature.

[0004] The existing metal wire mesh type liquid sulfur trap has poor gas-liquid separation efficiency, and the metal wire mesh is easily blocked by sulfur, so that a large amount of liquid sulfur is entrained in tail gas, the load of the tail gas system is increased, the pressure drop is increased, and even the sulfur is blocked in the tail gas system, so that the operation cycle and service life of the device are shortened. SUMMARY

[0005] The present application provides a high-efficiency liquid sulfur trap, which can effectively avoid the problem of sulfur blockage, thereby improving the gas-liquid separation effect, reducing the load of the tail gas system, and ensuring the service life of the device.

[0006] The present application provides a high-efficiency liquid sulfur trap, which comprises a tank body having a cavity, an air inlet, an air outlet and a liquid sulfur outlet communicating with the cavity; a heat transfer assembly arranged in the cavity and located in a gas passage between the air inlet and the air outlet, the heat transfer assembly having a gas passage and a medium passage capable of heat exchange with each other, the gas passage being used for passing process gas, and the medium passage being connected with an external heat exchange medium; and an air pressure detection assembly arranged on the tank body and used for detecting an air pressure difference between input and output ends of the gas passage; wherein the temperature of the heat exchange medium is adjustable, the temperature of the heat exchange medium is lower than the melting point of sulfur when the air pressure difference between the input and output ends of the gas passage is less than a preset value, so that liquid sulfur entrained by the process gas is condensed on the surface of the heat transfer assembly; and the temperature of the heat exchange medium is higher than the melting point of sulfur when the air pressure difference between the input and output ends of the gas passage is greater than or equal to the preset value, so that the sulfur condensed on the surface of the heat transfer assembly is melted.

[0007] In a possible implementation manner, the air pressure detection assembly comprises a first pressure sensor arranged at the input end of the gas passage and a second pressure sensor arranged at the output end of the gas passage.

[0008] In a possible implementation, the heat transfer assembly comprises a plurality of heat transfer plates, the inside of the heat transfer plates forms the medium channel, and the gas channel is formed between two adjacent heat transfer plates.

[0009] In a possible implementation, the heat transfer plate comprises two metal plate bodies, the medium channel is formed between the two metal plate bodies, the metal plate bodies are of an integral and equal-thickness structure, the side of the metal plate bodies facing the medium channel is provided with a first protruding part in a matrix arrangement, and a first recessed part is correspondingly formed on the side away from the medium channel, and the two metal plate bodies are connected to each other by the respective first protruding parts.

[0010] In a possible implementation, the side of the metal plate body facing the medium channel is provided with a baffle weld, and the baffle weld is arranged vertically or horizontally according to a preset center distance, for guiding the flow of the heat exchange medium.

[0011] In a possible implementation, the side of the metal plate body away from the medium channel is provided with a second protruding part, and a second recessed part is correspondingly formed on the side facing the medium channel, and the first protruding part and the second protruding part are arranged staggeredly.

[0012] In a possible implementation, a demister is further included, and the demister is located between the heat transfer assembly and the gas outlet.

[0013] In a possible implementation, a first heat tracing coil is further included, and the first heat tracing coil is attached to the bottom of the demister, for heating the demister.

[0014] In a possible implementation, a second heat tracing coil is arranged on the outer circumferential surface of the tank body; and / or, a heat tracing jacket is arranged outside the liquid sulfur outlet.

[0015] In a possible implementation, a gas distribution pipe is further included, and the gas distribution pipe is arranged in the cavity and communicates with the gas inlet, for uniformly distributing gas to the heat transfer assembly.

[0016] In a second aspect, the present application provides a liquid sulfur trapping method using the above high-efficiency liquid sulfur trap, comprising the following steps: the sulfur-containing process gas flows upward into the tank body; when the sulfur-containing process gas flows through the gas channel of the heat transfer assembly, heat exchange is performed with the heat exchange medium in the medium channel; when the gas pressure difference between the input end and the output end of the gas channel is less than a preset value, the temperature of the heat exchange medium is controlled to be lower than the melting point of sulfur, so that the liquid sulfur entrained by the process gas condenses on the surface of the heat transfer assembly; when the gas pressure difference between the input end and the output end of the gas channel is greater than or equal to the preset value, the temperature of the heat exchange medium is controlled to be higher than the melting point of sulfur, so that the sulfur condensed on the surface of the heat transfer assembly melts; the liquid sulfur entrained by the process gas is subjected to condensation-melting cycle operation by controlling the temperature of the heat exchange medium; and the trapped process gas is discharged from the gas outlet, and the trapped liquid sulfur is discharged from the liquid sulfur outlet.

[0017] The high-efficiency liquid sulfur trap provided by the present application realizes accurate determination of the operating state of the liquid sulfur trap and automatic adjustment of the operating parameters by establishing a real-time monitoring system based on a gas pressure detection assembly and an intelligent control system capable of adjusting the temperature of the heat exchange medium, and effectively solves the technical problems of poor gas-liquid separation efficiency and short operating cycle of the existing metal wire mesh type liquid sulfur trap caused by sulfur blockage. Specifically, the gas pressure detection assembly can accurately reflect the degree of blockage of the heat transfer assembly by real-time monitoring of the pressure difference between the input end and the output end of the gas passage, and when the pressure difference is less than the preset value, it indicates that the heat transfer assembly is unblocked, at which time the temperature of the heat exchange medium is controlled to be lower than the melting point of sulfur, promoting the full condensation of liquid sulfur in the process gas and maximizing the amount of liquid sulfur captured; when the pressure difference is greater than or equal to the preset value, it indicates that the heat transfer assembly starts to block, at which time the temperature of the heat exchange medium is automatically increased to be higher than the melting point of sulfur, causing the condensed sulfur to melt and flow down, removing the blockage in time and restoring the normal working state of the equipment. This condensation-melting cycle control mechanism based on real-time pressure difference feedback can take measures immediately when the equipment just starts to block, compared with the passive cleaning mode of the prior art, which not only avoids the occurrence of serious blockage, but also ensures the efficient capture of liquid sulfur, so that the equipment can run continuously and stably without frequent shutdown for manual cleaning. At the same time, the multi-heat transfer plate structure of the heat transfer assembly provides high heat exchange efficiency and a uniformly distributed temperature field, combined with real-time monitoring of gas pressure and intelligent control of medium temperature, compared with the traditional metal wire mesh, the liquid sulfur capture efficiency is increased from about 95% of the prior art to more than 99%, significantly reducing the amount of liquid sulfur entrained in the tail gas, reducing the load and pressure drop of the tail gas system, fundamentally eliminating the risk of sulfur blockage of the tail gas system, prolonging the operating cycle of the device, improving the sulfur recovery rate and production efficiency, and greatly improving the automation level of equipment operation, reducing manual intervention and maintenance costs. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0019] Figure 1 is a structural schematic diagram of a high-efficiency liquid sulfur trap provided by the present application.

[0020] Figure 2 is a top view structural schematic diagram of a flat plate type heat transfer assembly provided by the present application.

[0021] Figure 3 is a top view structural schematic diagram of a cylindrical heat transfer assembly provided by the present application.

[0022] Figure 4 is a structural schematic diagram of a metal plate body with vertical direction medium channels provided by the present application.

[0023] Figure 5 is a structural schematic diagram of a metal plate body with horizontal direction medium channels provided by the present application.

[0024] Figure 6 is a partial enlarged structural schematic diagram of a plurality of heat transfer plates provided by the present application.

[0025] Reference signs: 1, tank body; 11, cavity; 12, gas inlet; 13, gas outlet; 14, liquid sulfur outlet; 15, leg; 2, heat transfer assembly; 21, gas channel; 22, medium channel; 23, heat transfer plate; 231, metal plate body; 2311, first protruding part; 2312, first recessed part; 2313, baffle weld; 2314, second protruding part; 2315, second recessed part; 3, first pressure sensor; 4, second pressure sensor; 5, demister; 6, first heat tracing coil; 7, second heat tracing coil; 8, heat tracing jacket; 9, gas distribution pipe. DETAILED DESCRIPTION

[0026] To make the objectives, technical solutions and advantages of the present application clearer, the technical solutions in the present application will be described clearly and completely below in conjunction with the drawings in the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0027] The present application will be described below in conjunction with Figures 1-6 The embodiment of the present application described above provides a high-efficiency liquid sulfur collector, which comprises a tank body 1, a heat transfer assembly 2 and a gas pressure detection assembly, wherein: The tank body 1 has a cavity 11 and a gas inlet 12, a gas outlet 13 and a liquid sulfur outlet 14 which are in communication with the cavity 11. Specifically, the tank body 1 adopts a vertical structure, the liquid outlet is arranged at the bottom of the tank body 1, the liquid sulfur outlet 14 is a four-way structure, which is used for regular blowdown and cleaning of the collector; the gas inlet 12 is arranged at the bottom of the side wall of the tank body 1, and the gas outlet 13 is arranged at the top of the tank body 1. The bottom of the tank body 1 is provided with a leg 15, so that the liquid sulfur outlet 14 can smoothly guide out the sulfur.

[0028] The heat transfer assembly 2 is arranged in the cavity 11 and located in the gas passage between the gas inlet 12 and the gas outlet 13. The heat transfer assembly 2 has a gas channel 21 and a medium channel 22 which can exchange heat with each other. The gas channel 21 is used for passing process gas, and the medium channel 22 is in communication with external heat exchange medium.

[0029] A gas pressure detection assembly is arranged on the tank body 1 and used to detect the gas pressure difference between the input end and the output end of the gas passage 21.

[0030] In the present application, the temperature of the heat exchange medium can be adjusted, when the gas pressure difference between the input end and the output end of the gas passage 21 is less than a preset value, the temperature of the heat exchange medium is lower than the melting point of sulfur, so that the liquid sulfur entrained by the process gas condenses on the surface of the heat transfer assembly 2; when the gas pressure difference between the input end and the output end of the gas passage 21 is greater than or equal to the preset value, the temperature of the heat exchange medium is higher than the melting point of sulfur, so that the condensed sulfur on the surface of the heat transfer assembly 2 melts.

[0031] In the present application, by establishing a real-time monitoring system based on the gas pressure detection assembly and an intelligent control system with adjustable heat exchange medium temperature, accurate judgment of the operating state of the liquid sulfur trap and automatic adjustment of the operating parameters are realized, and the technical problems of poor gas-liquid separation efficiency and short running cycle of the existing metal wire mesh type liquid sulfur trap caused by sulfur blockage are effectively solved. Specifically, the gas pressure detection assembly can accurately reflect the degree of blockage of the heat transfer assembly by real-time monitoring of the pressure difference between the input end and the output end of the gas passage, when the pressure difference is less than a preset value, it indicates that the heat transfer assembly is unblocked, at this time, the temperature of the heat exchange medium is controlled to be lower than the melting point of sulfur, which promotes the full condensation of liquid sulfur in the process gas and maximizes the amount of liquid sulfur captured; when the pressure difference is greater than or equal to the preset value, it indicates that the heat transfer assembly starts to block, at this time, the temperature of the heat exchange medium is automatically increased to be higher than the melting point of sulfur, so that the condensed sulfur melts and flows down, removing the blockage in time and restoring the normal working state of the equipment. This condensation-melting cycle control mechanism based on real-time pressure difference feedback can take measures immediately when the equipment just starts to block, compared with the passive cleaning mode of the prior art, which not only avoids the occurrence of serious blockage, but also ensures the efficient capture of liquid sulfur, so that the equipment can run continuously and stably without frequent shutdown for manual cleaning. At the same time, the multi-heat transfer plate structure of the heat transfer assembly provides high heat exchange efficiency and uniform temperature field, combined with real-time monitoring of gas pressure and intelligent control of medium temperature, compared with the traditional metal wire mesh, the liquid sulfur capture efficiency is increased from about 95% of the prior art to more than 99%, the amount of liquid sulfur entrained in the tail gas is significantly reduced, the load and pressure drop of the tail gas system are reduced, the risk of sulfur blockage of the tail gas system is fundamentally eliminated, the running cycle of the device is prolonged, the sulfur recovery rate and production efficiency are improved, and the automation degree of the equipment operation is greatly improved, the manual intervention and maintenance cost are reduced.

[0032] Specifically, the tank body 1 provides a flow space for the sulfur-containing process gas, and the gas inlet 12, the gas outlet 13 and the liquid sulfur outlet 14 realize the functions of gas entering, treated gas discharging and liquid sulfur collecting and discharging respectively. The heat transfer assembly 2 is the core heat exchange component, the gas passage 21 is used for the process gas to pass through, and the medium passage 22 is connected with the external heat exchange medium, and the two are indirectly heat-exchanged through the wall surface of the heat transfer assembly 2. The gas pressure detection assembly provides a feedback signal for the control system by monitoring the pressure difference change before and after the heat transfer assembly 2 in real time, so as to ensure that the device can automatically adjust the operating parameters according to the actual operating state. The adjustability of the heat exchange medium temperature is the key to realize intelligent control, and through accurate control of the heat exchange medium temperature, the controlled condensation and melting of the liquid sulfur entrained by the process gas on the surface of the heat transfer assembly 2 can be realized.

[0033] In a specific embodiment, when the temperature of the process gas after the last stage condenser in a certain sulfur recovery device is 150℃ and the sulfur content is 2%, the traditional high-efficiency liquid sulfur trap often causes the separation efficiency to decrease due to sulfur condensation and blockage after a long time of operation, the amount of liquid sulfur entrained in the outlet gas increases, and the load and pressure drop of the tail gas system increase. The sulfur recovery device is continuously operated, and the trap cannot be frequently stopped and started in a short time. However, when the gas pressure detection assembly detects that the pressure difference before and after the heat transfer assembly 2 rises from the initial 100Pa to the preset value 500Pa, the heat exchange medium temperature is automatically increased from 90℃ to 140℃ (higher than the melting point of sulfur 119℃), so that the condensed sulfur melts and flows down, and then the pressure difference decreases to below 150Pa, and then the heat exchange medium temperature is decreased to 90℃ again for continuous trapping. The cycle operation can prolong the operation cycle of the device, reduce the fluctuation of the tail gas system, reduce the frequency of manual intervention, and the liquid sulfur trapping rate can reach more than 99%.

[0034] In the related art, the traditional high-efficiency liquid sulfur trap usually uses a metal wire mesh to trap the sulfur-containing process gas. The working principle of the wire mesh demister is to collect and separate the mist in the gas into droplets through mechanisms such as inertial impact, gravity sedimentation, surface tension and capillary action. When the liquid sulfur in the process gas condenses on the metal wire mesh, due to the lack of effective monitoring and control means, the operator often only manually cleans up regularly according to experience, which not only affects the production continuity, but also has the problems of incomplete cleaning or excessive cleaning frequency. Some technologies use heating for the metal wire mesh, but due to the lack of real-time monitoring of the actual blockage state of the device and the uneven heating, there is often a problem of improper heating timing. Either the liquid sulfur collection rate decreases due to early heating, or serious blockage occurs due to late heating.

[0035] In the embodiment of the present application, the degree of blockage of the heat transfer assembly 2 is monitored in real time by the gas pressure detection assembly, and the differential pressure value is used as the control basis to realize accurate control of the temperature of the heat transfer medium. Compared with the traditional way of regular cleaning or heating of the metal wire mesh, the present application can dynamically adjust according to the actual operating state of the equipment, which not only ensures a high liquid sulfur capture rate, but also avoids damage to the equipment caused by excessive blockage. Through intelligent condensation-melting cycle control, the automation level of equipment operation is significantly improved, reducing the frequency of manual intervention and improving production efficiency and safety. At the same time, since forced shutdown cleaning in the traditional method is avoided, the stability and continuity of the device operation have been significantly improved.

[0036] In some embodiments, the gas pressure detection assembly includes: a first pressure sensor 3 arranged at the input end of the gas channel 21; and a second pressure sensor 4 arranged at the output end of the gas channel 21.

[0037] In the present application, by arranging the first pressure sensor 3 and the second pressure sensor 4 at the input end and the output end of the gas channel 21 of the heat transfer assembly 2, respectively, accurate monitoring of the working state of the heat transfer assembly 2 is realized, and reliable feedback signals are provided for the automatic control system. The two pressure sensors measure the pressure values before and after the heat transfer assembly 2, respectively, and the pressure difference can accurately reflect the resistance change inside the heat transfer assembly 2. When the sulfur condensation on the surface of the heat transfer assembly 2 increases, the gas flow resistance increases, and the pressure difference increases accordingly, thereby providing timely and accurate state information for the control system.

[0038] Specifically, the first pressure sensor 3 is arranged at the input end of the gas channel 21 to measure the pressure of the process gas before entering the heat transfer assembly 2; and the second pressure sensor 4 is arranged at the output end of the gas channel 21 to measure the pressure of the process gas after passing through the heat transfer assembly 2. The difference between the pressure measurement values of the two sensors is the pressure drop of the heat transfer assembly 2, which directly reflects the size of the internal flow resistance of the heat transfer assembly 2. When the heat transfer assembly 2 starts to condense sulfur on its surface, the effective flow area decreases, the gas flow resistance increases, and the pressure drop increases accordingly. By monitoring this pressure drop change in real time, the control system can accurately judge the degree of blockage of the heat transfer assembly 2, and thus decide whether to adjust the temperature of the heat transfer medium.

[0039] In the embodiments of the present application, two independent pressure sensors are used to measure the pressures before and after the heat transfer assembly 2, which can not only obtain accurate pressure difference values, but also realize continuous monitoring. Compared with the traditional single-point measurement method, the double-point pressure measurement can eliminate the influence of system pressure fluctuations on the measurement results, improve the measurement accuracy and reliability. At the same time, the independent setting of the two pressure sensors also provides redundancy protection, so that the system can continue to work when one of the sensors fails, improving the reliability and safety of the system. Through accurate pressure difference monitoring, the control system can realize more refined control, avoiding both equipment blockage due to untimely control and liquid sulfur capture rate reduction due to excessive control.

[0040] In some embodiments, the heat transfer assembly 2 includes a plurality of heat transfer plates 23, and the inside of the heat transfer plate 23 forms a medium channel 22, and the gas channel 21 is formed between adjacent two heat transfer plates 23.

[0041] Specifically, the heat transfer plate 23 can adopt a flat plate structure or a cylindrical structure with different diameters.

[0042] In the present application, the heat transfer assembly 2 is designed to include a plurality of heat transfer plates 23, and the inside of the heat transfer plate 23 forms a medium channel 22, and the gas channel 21 is formed between adjacent heat transfer plates 23, which realizes efficient heat exchange between gas and heat transfer medium, and significantly improves the capture efficiency of liquid sulfur. The combination structure of multiple heat transfer plates 23 greatly increases the contact area of gas and heat transfer surface, and the medium channel 22 inside the heat transfer plate 23 and the gas channel 21 between the plates form a compact heat exchange system, which significantly improves the heat exchange efficiency. This structure design enables the process gas to contact more heat transfer surfaces when passing through the heat transfer assembly 2, thereby realizing more sufficient heat exchange.

[0043] Specifically, the medium channel 22 inside each heat transfer plate 23 is used for the flow of heat transfer medium to realize heat input or output; the gas channel 21 between adjacent two heat transfer plates 23 is used for the flow of process gas, and the process gas exchanges heat with the surface of the heat transfer plate 23. The parallel arrangement of multiple heat transfer plates 23 increases the contact area of gas in the heat transfer assembly 2, making the heat exchange more sufficient. At the same time, the special flow channel inside the heat transfer plate 23 provides longer residence time and higher turbulence for the heat transfer medium. When the process gas passes through the heat transfer plate 23, the temperature field is uniformly distributed, and the temperature of the heat transfer medium tends to be consistent, avoiding local overheating or overcooling, reducing thermal resistance, improving heat exchange efficiency, and reducing operating energy consumption. The alternating arrangement of the medium channel 22 and the gas channel 21 forms a compact and efficient heat exchanger structure for the entire heat transfer assembly 2.

[0044] In the embodiment of the present application, the combined structure of the plurality of heat transfer plates 23 provides a larger heat exchange area in the same device volume, significantly improving the heat exchange efficiency. Compared with the traditional single heat exchanger structure, the multi-heat transfer plate 23 structure not only has a large heat exchange area, but also is compact and has a small footprint. At the same time, the modular design of the heat transfer plate 23 facilitates adjusting the number of heat transfer plates 23 according to actual process requirements, realizing the unification of standardization and customization of the device. Through the parallel heat exchange of multiple heat transfer plates 23, the process gas can be more fully cooled, and the liquid sulfur capture rate is significantly improved. At the same time, due to the improvement of heat exchange efficiency, the consumption of heat exchange medium is also reduced accordingly, reducing the operating cost.

[0045] As shown in Figure 6 In some embodiments, the heat transfer plate 23 includes two metal plate bodies 231, and a medium channel 22 is formed between the two metal plate bodies 231. The metal plate body 231 is an integral structure with equal thickness, and the side of the metal plate body 231 facing the medium channel 22 is provided with a first protruding portion 2311 in a matrix, and a first recessed portion 2312 is formed on the side away from the medium channel 22. The two metal plate bodies 231 are connected to each other by the respective first protruding portions 2311.

[0046] In the present application, the heat transfer plate 23 is designed as an integrated structure including two metal plate bodies 231, wherein the side of the metal plate body 231 facing the medium channel 22 is provided with a first protruding portion 2311 in a matrix, and a first recessed portion 2312 is formed on the side away from the medium channel 22. The two metal plate bodies 231 are connected to each other by the respective first protruding portions 2311, realizing high-strength connection and high-efficiency heat transfer of the heat transfer plate 23. The integrated structure ensures the overall strength and manufacturing consistency of the heat transfer plate 23. The matrix arrangement of the first protruding portion 2311 not only ensures the reliable connection of the two metal plate bodies 231, but also enhances the structural strength of the heat transfer plate 23. At the same time, the protruding portion as a turbulence element can destroy the laminar boundary layer of the medium, significantly enhancing the heat exchange effect.

[0047] Specifically, the two metal plate bodies 231 are manufactured by an integral molding process, ensuring the uniformity of the plate thickness and the consistency of the material properties. The first protruding portions 2311 are arranged in a matrix, providing multi-point support and connection for the two metal plate bodies 231, allowing the heat transfer plate 23 to withstand high pressure without deformation. The presence of the first protruding portions 2311 divides the medium channel 22 into multiple small channels that are interconnected, causing disturbances in the flow of the heat transfer medium, increasing the turbulence, breaking the laminar boundary layer, and enhancing the convective heat transfer effect. At the same time, the formation of the first recessed portions 2312 increases the heat transfer area on the gas side, providing more heat transfer contact surfaces for the process gas and further improving the heat transfer efficiency. The two metal plate bodies 231 are connected by the contact of the first protruding portions 2311 to form a stable medium channel 22, ensuring both sealing and structural strength.

[0048] In related technologies, the heat transfer plate 23 is usually made of multiple layers of materials welded together or a simple flat plate structure, which has problems such as insufficient connection strength and low heat transfer efficiency. The multi-layer welded structure is prone to stress concentration at the weld, which may crack and leak after long-term use. The simple flat plate structure has poor structural strength and low pressure capacity, and the heat transfer efficiency is low, which cannot meet the requirements of high-efficiency heat transfer.

[0049] In the embodiments of the present application, the integrated structure avoids the quality problems that may be caused by multi-layer welding, and the material properties are uniform and consistent, with a longer service life. The matrix arrangement of the first protruding portions 2311 provides distributed support for the heat transfer plate 23, which has higher structural strength and better fatigue resistance compared to traditional weld connections. At the same time, the first protruding portions 2311 also play a role in strengthening heat transfer by generating turbulence to improve heat transfer efficiency, which is not achievable with traditional flat plate structures. By optimizing the height, spacing, and arrangement of the first protruding portions 2311, the best heat transfer effect can be achieved while ensuring structural strength, achieving a perfect combination of structural strength and heat transfer performance.

[0050] As shown in Figure 4 , 5 In some embodiments, the metal plate body 231 is provided with a baffle weld 2313 on the side facing the medium channel 22, which is arranged vertically or horizontally according to a predetermined center distance, used to guide the flow of the heat transfer medium.

[0051] In the present application, by arranging the baffle weld 2313 on the side of the metal plate body 231 facing the medium channel 22, and arranging the baffle weld 2313 vertically or horizontally according to the preset center distance, the effective guidance of the heat exchange medium flow is realized, the medium short circuit is avoided, and the heat exchange area of the heat transfer plate 23 is fully utilized, which significantly improves the heat exchange uniformity and efficiency. The arrangement of the baffle weld 2313 forms a regular flow path for the heat exchange medium in the heat transfer plate 23, increases the residence time of the medium in the heat transfer plate 23, and further enhances the heat exchange effect by changing the flow direction to produce disturbance.

[0052] Specifically, the baffle weld 2313 is formed by welding process, which divides the medium channel 22 into multiple flow areas connected to each other. The vertically arranged baffle weld 2313 makes the heat exchange medium flow tortuously in the horizontal direction, increasing the flow path length; the horizontally arranged baffle weld 2313 makes the heat exchange medium flow in layers in the vertical direction, ensuring the uniformity of the medium distribution. The preset center distance ensures that there is enough flow space between the baffle welds 2313, which not only does not cause excessive flow resistance, but also realizes effective flow guidance. The existence of the baffle weld 2313 makes the heat exchange medium unable to flow directly from the inlet to the outlet, and must flow according to the designed path, thereby fully utilizing the heat exchange area of the entire heat transfer plate 23.

[0053] In the embodiment of the present application, the arrangement of the baffle weld 2313 effectively solves the problem of uneven medium distribution. By reasonably designing the position and direction of the baffle weld 2313, uniform flow distribution of the heat exchange medium in the entire heat transfer plate 23 can be formed, avoiding the occurrence of short circuit and dead zone. Compared with the traditional flat plate structure, the baffle weld 2313 not only improves the heat exchange efficiency, but also reduces the requirement for the flow of heat exchange medium, which can reduce the circulation amount of medium under the same heat exchange effect, thereby reducing the operating energy consumption of the system. At the same time, the arrangement of the baffle weld 2313 also enhances the structural strength of the heat transfer plate 23, improves the service life and reliability of the equipment.

[0054] As shown in Figure 6 In some embodiments, the metal plate body 231 is provided with a second protrusion 2314 on the side away from the medium channel 22, and a second recess 2315 is formed on the side facing the medium channel 22, and the first protrusion 2311 and the second protrusion 2314 are arranged staggered.

[0055] In the present application, by arranging the second protruding part 2314 on the side of the metal plate body 231 away from the medium channel 22, and correspondingly forming the second recessed part 2315 on the side facing the medium channel 22, and staggering the first protruding part 2311 and the second protruding part 2314, the gas side heat exchange area is significantly increased and the heat transfer enhancement effect is further improved. The arrangement of the second protruding part 2314 not only increases the heat transfer area on the gas side, but also destroys the laminar boundary layer of the gas as a spoiler element, strengthening the convective heat transfer on the gas side. The staggering arrangement of the first protruding part 2311 and the second protruding part 2314 forms a complex heat transfer surface, so that the metal plate body 231 has the function of strengthening heat transfer on both the medium side and the gas side.

[0056] Specifically, the second protruding part 2314 is located on the side of the metal plate body 231 away from the medium channel 22, i.e. the side facing the gas channel 21, which forms a three-dimensional undulating heat exchange surface on this side surface instead of a flat surface. The second recessed part 2315 is located on the side of the metal plate body 231 facing the medium channel 22, corresponding to the second protruding part 2314, which increases the heat exchange area on the medium side. The staggering arrangement of the first protruding part 2311 and the second protruding part 2314 means that the two do not coincide in planar position, and such arrangement makes the metal plate body 231 form a wave-shaped complex structure, which maximizes the heat exchange area while ensuring structural strength. When the process gas flows through the gas channel 21, the disturbance caused by the second protruding part 2314 improves the turbulence of the gas, destroys the laminar boundary layer, and significantly enhances the convective heat transfer effect.

[0057] In the embodiment of the present application, the special arrangement of the second protruding part 2314 specifically solves the problem of low heat exchange efficiency on the gas side. By staggering the first protruding part 2311 and the second protruding part 2314, the heat transfer plate 23 has the function of strengthening heat transfer on both the medium side and the gas side, achieving the effect of double-sided heat transfer enhancement. Compared with the traditional single-sided enhancement or non-enhancement structure, this design makes the whole heat transfer process more balanced, avoiding the situation that one side becomes the bottleneck of heat transfer. At the same time, the staggered protruding part structure also has a self-cleaning effect, which improves the turbulence of the fluid on both sides, helps to prevent the accumulation of dirt on the heat transfer surface, maintains the cleanliness of the heat transfer surface, and prolongs the operation cycle of the equipment.

[0058] In some embodiments, a demister 5 is further included, which is located between the heat transfer assembly 2 and the gas outlet 13.

[0059] In the present application, by setting the demister 5 between the heat transfer assembly 2 and the gas outlet 13, the secondary capture of the process gas after being treated by the heat transfer assembly 2 is realized, and the residual liquid sulfur droplets in the gas are effectively removed, further improving the overall liquid sulfur capture efficiency. The setting of the demister 5 solves the problem that the heat transfer assembly 2 cannot completely capture fine liquid sulfur droplets, especially for liquid sulfur particles with small particle size and easy to be carried by the gas flow, which has good separation effect, ensures the cleanliness of the exhaust gas, and reduces the loss of liquid sulfur.

[0060] Specifically, the demister 5 is located above the heat transfer assembly 2. After the process gas is cooled and the liquid sulfur is condensed by the heat transfer assembly 2, it may still carry a certain amount of liquid sulfur droplets. These droplets are small in size and low in gravity, and are easy to move with the gas flow and difficult to separate completely in the heat transfer assembly 2. The demister 5 provides opportunities for collision, coalescence and sedimentation of liquid sulfur droplets through its special structure design, such as wire mesh, corrugated plate or other separation elements. When the process gas containing liquid sulfur droplets passes through the demister 5, the droplets collide with the internal structure of the demister 5, the small droplets coalesce into large droplets, and the droplets are separated by gravity, achieving the purpose of gas-liquid separation.

[0061] In related art, the liquid sulfur capture device usually only relies on a single metal wire mesh for liquid sulfur separation, and lacks effective separation means for fine liquid sulfur droplets remaining in the gas after separation. These fine droplets not only cause waste of sulfur resources, but also may cause corrosion and pollution to downstream equipment, and affect the environmental protection indicators of the exhaust gas. Some devices set multiple levels of metal wire mesh traps, but the separation efficiency is limited and cannot effectively remove fine droplets.

[0062] In the embodiments of the present application, the special setting of the demister 5 solves the problem of separation of fine liquid sulfur droplets. As a professional gas-liquid separation device, the demister 5 has high separation performance and low pressure drop, and can realize efficient separation without significantly increasing the system resistance. Compared with the traditional single metal wire mesh separation method, the combination of the heat transfer assembly 2 and the demister 5 realizes the combination of coarse separation and fine separation, greatly improving the total separation efficiency. At the same time, the setting of the demister 5 also plays a role in protecting the downstream equipment, avoiding corrosion and blockage of the liquid sulfur droplets to the pipeline, valve and other equipment, prolonging the service life of the entire system.

[0063] In some embodiments, a first heat tracing coil 6 is further included, which is attached to the bottom of the demister 5 for heating the demister 5.

[0064] In the present application, by setting the first heat tracing coil 6 which is attached to the bottom of the demister 5, the effective heating of the demister 5 is realized, the solidification and blockage of the captured liquid sulfur on the surface of the demister 5 are prevented, the normal work of the demister 5 is ensured, the equipment operation cycle is prolonged, and the maintenance frequency is reduced. The first heat tracing coil 6 provides the necessary heat to the demister 5, so that the temperature of the entire demister 5 is maintained above the sulfur melting point, ensuring that the separated liquid sulfur can flow down in time and will not accumulate and solidify inside the demister 5.

[0065] Specifically, the first heat tracing coil 6 is attached to the bottom of the demister 5 and provides heating to the demister 5 through heat conduction. During the process of separating liquid sulfur droplets, a large amount of liquid sulfur will accumulate on the surface of the internal structure of the demister 5. If the temperature is too low, these liquid sulfurs will solidify and adhere to the surface of the demister 5, gradually blocking the flow channel of the demister 5, affecting the separation effect and even causing the equipment to fail to work normally. The first heat tracing coil 6 provides a stable heat source to the bottom of the demister 5 by circulating a heat medium (such as steam), and the heat is transferred to each part of the demister 5 through conduction, so that the entire demister 5 maintains an appropriate temperature. The attached setting ensures the efficiency of heat transfer, while avoiding excessive heat loss.

[0066] In the present application, the attachment of the first heat tracing coil 6 to the bottom of the demister 5 realizes efficient heat transfer, and compared with the traditional indirect heating method, the heat transfer efficiency is improved by more than 40%. Through the bottom heating method, the characteristics of heat transfer upward can make the entire demister 5 maintain an appropriate temperature, avoiding the problem of local overheating or overcooling. At the same time, the heating structure of the coil type has better applicability and reliability compared with other heating methods, and is convenient for temperature control and maintenance. Through accurate temperature control, the normal work of the demister 5 is ensured, and the waste of energy caused by excessive heating is avoided, realizing the unity of economy and reliability.

[0067] In some embodiments, a second heat tracing coil 7 is arranged on the outer circumferential surface of the tank body 1; and / or a heat tracing jacket 8 is arranged outside the liquid sulfur outlet 14.

[0068] In the present application, by arranging the second heat tracing coil 7 on the outer circumferential surface of the tank body 1 and / or arranging the heat tracing jacket 8 outside the liquid sulfur outlet 14, the overall heat preservation and heating of the entire liquid sulfur trap is realized, the solidification and blockage of liquid sulfur on the inner wall of the tank body 1 and at the outlet are prevented, the smooth discharge of liquid sulfur is ensured, and the reliability of the equipment operation is improved. The second heat tracing coil 7 maintains the overall temperature of the tank body 1, avoiding the solidification of liquid sulfur inside the tank body 1 due to too low temperature; the heat tracing jacket 8 is specially designed for heat preservation of the liquid sulfur outlet 14, preventing the blockage caused by solidification of liquid sulfur during discharge.

[0069] Specifically, the second heat tracing coil 7 is arranged spirally or in parallel along the outer circumferential surface of the tank body 1 to provide heating for the whole tank body 1 by circulating a heat medium. The tank body 1 is the main container of the liquid sulfur trap, and the temperature of the inner wall of the tank body 1 directly affects the flowability of the liquid sulfur. If the temperature is too low, the trapped liquid sulfur may re-solidify during flowing to the outlet, forming solid sulfur blocks, which not only affects the normal discharge of the liquid sulfur, but also may damage the internal structure of the tank body 1. The heat tracing jacket 8 is arranged outside the liquid sulfur outlet 14 to provide heat preservation for the last link of the liquid sulfur discharge, ensuring that the liquid sulfur remains in a flowing state when leaving the device. The combination of the two heat tracing measures realizes whole-process heat preservation from the inside of the tank body 1 to the liquid sulfur outlet 14, ensuring that the liquid sulfur is in suitable temperature conditions during the whole process from trapping to discharging.

[0070] In some embodiments, the gas distribution pipe 9 is further included, which is arranged in the cavity 11 and communicates with the gas inlet 12, and is used for uniformly distributing the gas to the heat transfer assembly 2.

[0071] In the present application, by arranging the gas distribution pipe 9 in the cavity 11 and communicating with the gas inlet 12, uniform distribution of the sulfur-containing process gas before entering the heat transfer assembly 2 is realized, heat transfer unevenness caused by gas deflection is avoided, and it is ensured that each part of the heat transfer assembly 2 can fully play a role, thereby improving the overall trapping efficiency. The gas distribution pipe 9 re-distributes the process gas entering from the gas inlet 12 through its special structure design, so that the gas can be uniformly distributed to each area of the heat transfer assembly 2, avoiding the local overload or idle phenomenon caused by uneven gas distribution.

[0072] Specifically, the gas distribution pipe 9 is arranged in the lower part of the cavity 11 of the tank body 1 and directly communicates with the gas inlet 12 to receive the sulfur-containing process gas delivered from the external pipeline. The gas distribution pipe 9 is usually designed as a perforated pipe or a half-pipe structure, and a plurality of gas outlet holes are formed on the pipe wall. These gas outlet holes are distributed according to certain rules to ensure that the gas can flow upward after diffusing from different positions or downward. When the process gas enters the gas distribution pipe 9, it is dispersed or flows out of the half-pipe through each gas outlet hole, forming a plurality of parallel or downward gas flows. These gas flows gradually diffuse during the rising or falling process, and finally form a relatively uniform flow field distribution at the inlet of the heat transfer assembly 2. The presence of the gas distribution pipe 9 also plays a role in reducing the gas flow rate, avoiding the direct impact of high-speed gas flow on the heat transfer assembly 2, and reducing the adverse effects of gas flow disturbance on the heat transfer effect.

[0073] In the embodiment of the present application, the special arrangement of the gas distribution pipe 9 effectively solves the problem of uneven gas distribution. By reasonably designing the half-pipe structure and opening mode of the gas distribution pipe 9, the process gas can be uniformly distributed to each area of the heat transfer assembly 2, and the full use of the heat transfer assembly 2 is realized. Compared with the traditional direct gas inlet mode, the gas distribution pipe 9 also has a buffering effect, which can reduce the influence of gas flow fluctuation on the heat transfer effect and improve the stability of the system operation. At the same time, uniform gas distribution is also beneficial to reducing the local wear and corrosion of the heat transfer assembly 2, prolonging the service life of the equipment.

[0074] The present application provides a liquid sulfur trapping method using the above-mentioned high-efficiency liquid sulfur trap, comprising the following steps: S1, the sulfur-containing process gas flows upward into the tank body 1; S2, when the sulfur-containing process gas flows through the gas channel 21 of the heat transfer assembly 2, heat exchange is carried out with the heat exchange medium in the medium channel 22; S3, when the gas pressure difference between the input end and the output end of the gas channel 21 is less than a preset value, the temperature of the heat exchange medium is controlled to be lower than the melting point of sulfur, so that the liquid sulfur entrained by the process gas condenses on the surface of the heat transfer assembly 2; S4, when the gas pressure difference between the input end and the output end of the gas channel 21 is greater than or equal to the preset value, the temperature of the heat exchange medium is controlled to be higher than the melting point of sulfur, so that the sulfur condensed on the surface of the heat transfer assembly 2 melts; S5, the liquid sulfur entrained by the process gas is subjected to condensation-melting cycle operation by controlling the temperature of the heat exchange medium; S6, the process gas treated by the heat transfer assembly 2 is subjected to secondary trapping by the demister 5; S7, the process gas after trapping is discharged from the gas outlet, and the trapped liquid sulfur is discharged from the liquid sulfur outlet 14.

[0075] In the present application, by adopting the intelligent liquid sulfur trapping method based on pressure difference feedback, the automation control of the liquid sulfur trapping process is realized, the manual judgment and operation in the traditional method are avoided, the operation precision and consistency are improved, the labor intensity is reduced, and the continuous and stable liquid sulfur trapping effect is ensured. The method automatically judges the degree of blockage of the equipment by monitoring the change of the gas pressure difference before and after the heat transfer assembly 2 in real time, and adjusts the temperature of the heat exchange medium accordingly, realizes the intelligent cycle control of condensation-melting, and significantly improves the automation level and reliability of the equipment operation.

[0076] Specifically, the sulfur-containing process gas flows upward after entering the tank body 1, and indirectly exchanges heat with the heat exchange medium in the medium channel 22 at the heat transfer assembly 2. When the gas pressure difference is less than the preset value, it indicates that the heat transfer assembly 2 is unobstructed, at this time, the temperature of the heat exchange medium is lower than the melting point of sulfur, which promotes the condensation of liquid sulfur in the process gas, and maximizes the amount of liquid sulfur capture; when the gas pressure difference is greater than or equal to the preset value, it indicates that the heat transfer assembly 2 starts to be blocked, at this time, the temperature of the heat exchange medium is increased to be higher than the melting point of sulfur, so that the condensed sulfur is melted and flows down, and the blockage is removed. This control strategy based on real-time pressure difference feedback can automatically adjust the operating parameters according to the actual state of the device, which not only ensures a high liquid sulfur capture rate, but also avoids device blockage, and realizes the unity of efficiency and safety.

[0077] In the embodiment of the present application, the automatic control method based on pressure difference feedback realizes truly intelligent operation. Compared with the traditional manual judgment method, this method has the advantages of fast response, accurate control, and good consistency, and can take timely measures when the device just starts to show a tendency to block, which not only avoids serious blockage, but also maximizes the liquid sulfur capture time. Through automatic control, not only the operation efficiency is improved, but also the skill level of the operator is reduced, and the possibility of human error is reduced. At the same time, this method also has good adaptability, and can adjust the preset value and temperature parameters according to different process conditions, realizing the optimal control of device operation.

[0078] The device embodiments described above are only schematic, and units described as separate components can or can not be physically separate, and components displayed as units can or can not be physical units, i.e. can be located in one place, or can be distributed on multiple network units. Part or all of the modules can be selected to achieve the purpose of the embodiment scheme according to actual needs. Those skilled in the art can understand and implement without creative labor.

[0079] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A high efficiency liquid sulfur trap characterized in that, The application relates to a sulfur condensing device. The device comprises: a tank body (1) with a cavity (11) and an air inlet (12), an air outlet (13) and a liquid sulfur outlet (14) communicating with the cavity (11); a heat transfer assembly (2) arranged in the cavity (11) and located in a gas passage between the air inlet (12) and the air outlet (13), the heat transfer assembly (2) having a gas passage (21) and a medium passage (22) capable of heat exchange with each other, the gas passage (21) being used for passing process gas, and the medium passage (22) communicating with an external heat exchange medium; an air pressure detection assembly arranged on the tank body (1) and used for detecting the air pressure difference between the input end and the output end of the gas passage (21); 2. The high efficiency liquid sulfur trap of claim 1, wherein, wherein the temperature of the heat exchange medium is adjustable, when the air pressure difference between the input end and the output end of the gas passage (21) is less than a preset value, the temperature of the heat exchange medium is lower than the melting point of sulfur, so that liquid sulfur carried by the process gas is condensed on the surface of the heat transfer assembly (2); and when the air pressure difference between the input end and the output end of the gas passage (21) is greater than or equal to the preset value, the temperature of the heat exchange medium is higher than the melting point of sulfur, so that the sulfur condensed on the surface of the heat transfer assembly (2) is melted. The air pressure detection assembly comprises: a first pressure sensor (3) arranged at the input end of the gas passage (21); 3. The high efficiency liquid sulfur trap of claim 1, wherein, a second pressure sensor (4) arranged at the output end of the gas passage (21).

4. The high efficiency liquid sulfur trap of claim 3, wherein, The heat transfer assembly (2) comprises a plurality of heat transfer plates (23), the inside of the heat transfer plate (23) forms the medium passage (22), and the gas passage (21) is formed between two adjacent heat transfer plates (23).

5. The high efficiency liquid sulfur trap of claim 4, wherein, The heat transfer plate (23) comprises two metal plate bodies (231), the medium passage (22) is formed between the two metal plate bodies (231), the metal plate body (231) is an integral one-piece structure with equal thickness, a first protruding part (2311) is arranged on the side of the metal plate body (231) facing the medium passage (22) in a matrix mode, a first recessed part (2312) is correspondingly formed on the side away from the medium passage (22), and the two metal plate bodies (231) are connected to each other through the first protruding parts (2311) of the two metal plate bodies (231).

6. The high efficiency liquid sulfur trap of claim 4 wherein, The side of the metal plate body (231) facing the medium passage (22) is provided with a baffle weld (2313) arranged vertically or horizontally at a preset center distance, and the baffle weld (2313) is used for guiding the flow of the heat exchange medium.

7. The high efficiency liquid sulfur trap of claim 1, wherein, The side of the metal plate body (231) away from the medium passage (22) is provided with a second protruding part (2314), and a second recessed part (2315) is correspondingly formed on the side facing the medium passage (22), and the first protruding part (2311) and the second protruding part (2314) are arranged staggeredly. The device further comprises a defoamer (5) located between the heat transfer assembly (2) and the air outlet (13).

8. The high efficiency liquid sulfur trap of claim 7, wherein, Further comprising a first heat tracing coil (6) which is attached to the bottom of the demister (5) for heating the demister (5).

9. The high efficiency liquid sulfur trap of any one of claims 1-8, wherein, The outer circumferential surface of the tank body (1) is provided with a second heat tracing coil (7); And / or, the liquid sulfur outlet (14) is externally provided with a heat tracing jacket (8).

10. The high efficiency liquid sulfur trap of any one of claims 1-8, wherein, Further comprising a gas distribution pipe (9) which is arranged in the cavity (11) and communicates with the gas inlet (12) for uniformly distributing gas to the heat transfer assembly (2).

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