Improved molten sulphur liquor treatment plant

Abstract

The utility model relates to an improved processing device of molten sulfur clear liquid, and the outer periphery along the top of clear liquid sedimentation tank is provided with guardrails, the clear liquid sedimentation tank is equipped with a partition, and the partition one end top is equipped with overflow port, the clear liquid sedimentate tank one side's sub -pool cover plate support is equipped with volatile gas interface and molten sulfur clear liquid import, and the middle sub -pool cover plate is provided with observation hole and liquid level detection hole, and the other side sub -pool cover plate is provided with liquid under pump interface, the liquid under pump export is connected respectively through pipeline second control valve and third control valve, and second control valve is connected through pipeline circulating groove, and third control valve is connected through pipeline heat exchanger, and heat exchanger is connected with circulating groove. Simple structure, stable operation, do not need special maintenance and overhaul, guarantee the clear liquid that comes out of molten sulfur kettle when returning desulfurization system sulfur residue is effectively separated, and the clear liquid temperature is effectively controlled, the influence that causes to desulfurization system operation temperature is avoided, and the maintenance difficulty and production cost of desulfurization system equipment are reduced.

Description

Technical Field

[0001] This utility model relates to equipment for treating molten sulfur clear liquid in the desulfurization process of coke oven gas, and is applicable to the wet desulfurization production technology of anthraquinone modified coke oven gas process. In particular, it relates to an improved molten sulfur clear liquid treatment device. Background Technology

[0002] Coke oven gas desulfurization processes are generally divided into wet desulfurization and dry desulfurization. The process involved is wet desulfurization of coke oven gas using sodium as the alkali source; its process flow diagram is shown below. Figure 1 As shown: Coal gas enters the lower part of desulfurization tower 1 and comes into countercurrent contact with the desulfurization liquid sprayed from the top of desulfurization tower 1. After the removal of hydrogen sulfide and hydrogen cyanide, the coal gas is discharged from the top of desulfurization tower 1 through liquid-foam separator 2. The desulfurization liquid flows from the bottom of desulfurization tower 1 through liquid seal tank 3 into circulation tank 4, and is then sent to heater 5 by desulfurization mother liquor circulation pump 9 to control the temperature at about 40°C before entering the lower part of regeneration tower 6, where it rises in parallel with the supplied compressed air. After being oxidized and regenerated by air, the desulfurization liquid flows back into desulfurization tower 1 for recycling via liquid level regulator 7. The sulfur foam floating at the top of regeneration tower 6 flows into foam tank 8, is heated and stirred, and then sent to sulfur melting kettle 11 by foam pump 10. The sulfur melting kettle 11 is heated to above 130°C by indirect steam to melt the sulfur and separate it from the sulfur slag. The molten sulfur is then cooled to obtain the sulfur product. The molten sulfur liquid and sulfur slag separated from the sulfur melting kettle are returned to the desulfurization system circulation tank 4 for recycling.

[0003] In this process, the clear liquid separated from the sulfur melting kettle 11 has a high temperature, generally around 100℃, and contains sulfur slag. This untreated liquid is directly returned to the desulfurization system's circulation tank 4, causing the temperature of the desulfurization mother liquor to fail to maintain the required stable temperature of around 40℃, which is the process control requirement. Simultaneously, the sulfur slag in the clear liquid returning to the desulfurization system continuously accumulates within the system, causing pipe blockages. This gradually deteriorates the desulfurization system's operation, reduces the desulfurization effect, and causes the hydrogen sulfide level after the tower to exceed the design value. Utility Model Content

[0004] To address the above problems, this invention provides an improved treatment device for molten sulfur clear liquid in coke oven gas desulfurization processes using sodium as the alkali source. This device ensures effective separation of sulfur slag when the clear liquid exiting the molten sulfur kettle returns to the desulfurization system. Simultaneously, the temperature of the clear liquid is effectively controlled during its return to the desulfurization system, preventing any impact on the system's operating temperature and thus creating conditions for the long-term stable operation of the desulfurization system.

[0005] The purpose of this utility model is achieved as follows: An improved molten sulfur clearing liquid treatment device includes a clearing liquid sedimentation tank connected to the outlet of the molten sulfur kettle. The clearing liquid sedimentation tank has a rectangular box structure with a dividing tank cover on the top surface. Reinforcing ribs are provided below the dividing tank cover, and a guardrail is provided along the outer perimeter of the top of the clearing liquid sedimentation tank. A partition wall is provided inside the clearing liquid sedimentation tank, with an overflow port at the top of one end of the partition wall. A support is provided at one end of the dividing tank cover on one side of the clearing liquid sedimentation tank, and a volatile gas interface and a molten sulfur clearing liquid inlet are provided on the support. An observation hole and a liquid level detection hole are provided on the dividing tank cover in the middle of the clearing liquid sedimentation tank, and a submersible pump interface is provided on the dividing tank cover on the other side of the clearing liquid sedimentation tank. The volatile gas interface is connected to a volatile gas treatment device via a pipeline and a first control valve. The outlet of the submersible pump is connected to a second control valve and a third control valve via pipelines. The second control valve is connected to a circulation tank via a pipeline, and the third control valve is connected to a heat exchanger via a pipeline. The heat exchanger has a cooling water inlet and a cooling water outlet, and is also connected to the circulation tank.

[0006] Furthermore, the sedimentation tank contains at least two partition walls, and the overflow outlets above are staggered.

[0007] Furthermore, the partition wall separates the sedimentation tank into equal-volume sub-tanks.

[0008] Furthermore, the pool cover is a rectangular stainless steel plate.

[0009] Furthermore, the upper edge of the partition wall is 10cm to 15cm lower than the bottom edge of the reinforcing rib.

[0010] This invention optimizes and improves the treatment system for molten sulfur clear liquid in the sodium-based alkali source process of wet desulfurization of coke oven gas. It separates and precipitates the clear liquid mixed with sulfur slag during the molten sulfur process, and cools and controls the temperature of the clear liquid to meet the temperature requirements of the desulfurization mother liquor when the clear liquid is returned to the desulfurization system. This effectively maintains the long-term stability of the sodium-based alkali source desulfurization process of coke oven gas, prevents blockage of the desulfurization tower, extends equipment life, and reduces alkali consumption in the desulfurization system. Simultaneously, the clear liquid sedimentation tank is easy to clean; the stainless steel tank cover can be removed, and the sulfur slag in the tank can be cleaned using small excavators, greatly reducing the labor intensity and production cost of cleaning the sulfur slag in the sedimentation tank. The clear liquid sedimentation tank is equipped with a volatile gas interface at the inlet of the clear liquid, which can collect volatile gases generated during the sedimentation process to prevent odor overflow and improve the on-site working environment. This invention features a simple structure and stable operation, requiring no special maintenance or repair. It ensures that the sulfur residue is effectively separated when the clear liquid from the sulfur melting kettle returns to the desulfurization system, and the temperature of the clear liquid is effectively controlled, avoiding any impact on the operating temperature of the desulfurization system. This creates conditions for the long-term stable operation of the desulfurization system and reduces the maintenance difficulty and production cost of the desulfurization system equipment. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the production process of anthraquinone wet desulfurization using coke oven gas with sodium as the alkali source.

[0012] Figure 2 This is a schematic diagram of the process flow of this utility model;

[0013] Figure 3 This is a top view of the sedimentation tank 12 of the present invention;

[0014] Figure 4 This is a schematic diagram of the structure of the sedimentation tank 12 covered with a dividing tank cover plate 17 in this utility model;

[0015] Figure 5 yes Figure 4 Schematic diagram of the AA-direction cross-section structure.

[0016] In the diagram: 1-Desulfurization tower, 2-Liquid foam separator, 3-Liquid seal tank, 4-Circulation tank, 5-Heater, 6-Regeneration tower, 7-Liquid level regulator, 8-Sulfur foam tank, 9-Desulfurization mother liquor circulation pump, 10-Foam pump, 11-Sulfur melting kettle, 12-Sedimentation tank, 13-Submersible pump, 14-First control valve, 15-Heat exchanger, 16-Overflow port, 17-Divider cover, 18-Guardrail, 19-Partition wall, 20-Volatile gas interface, 21-Sulfur melting and clearing liquid inlet, 22-Observation hole, 23-Liquid level detection hole, 24-Second control valve, 25-Third control valve, 26-Reinforcing rib, 27-Support. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments. See also Figures 2 to 5 An improved sulfur melting and cleaning liquid treatment device includes a cleaning liquid sedimentation tank 12 connected to the outlet of the sulfur melting kettle 11 (e.g., Figure 2 As shown), the sedimentation tank 12 has a rectangular box structure with a rectangular stainless steel dividing cover 17 on the top surface. Reinforcing ribs 26 are provided below the dividing cover 17. A guardrail 18 is provided along the outer perimeter of the top of the sedimentation tank 12. At least two partition walls 19 are provided inside the sedimentation tank 12, forming equal-volume dividing tanks. Each partition wall 19 has staggered overflow outlets 16 at one end of its top. The upper edge of the partition wall 19 is 10cm to 15cm lower than the bottom edge of the reinforcing rib 26 (e.g., ...). Figure 3 , Figure 4 and Figure 5(As shown). A bracket 27 is provided at one end of the dividing tank cover 17 on one side of the clear liquid sedimentation tank 12. The bracket 27 is equipped with a volatile gas interface 20 and a molten sulfur clear liquid inlet 21. An observation hole 22 and a liquid level detection hole 23 are provided on the dividing tank cover 17 in the middle of the clear liquid sedimentation tank 12. A submersible pump 13 interface (as shown) is provided on the dividing tank cover 17 on the other side of the clear liquid sedimentation tank 12. Figure 4 (As shown); the volatile gas interface 20 is connected to the volatile gas treatment device via a pipeline and a first control valve 14; the outlet of the submersible pump 13 is connected to a second control valve 24 and a third control valve 25 via pipelines respectively. The second control valve 24 is connected to the circulation tank 4 via a pipeline, and the third control valve 25 is connected to the heat exchanger 15 via a pipeline. The heat exchanger 15 is provided with a cooling water inlet and a cooling water outlet, and the heat exchanger 15 is connected to the circulation tank 4 (as shown). Figure 2 (As shown).

[0018] This utility model is an improved molten sulfur cleaning liquid treatment device based on wet desulfurization of coke oven gas using sodium as the alkali source. It includes a sedimentation tank 12 for molten sulfur cleaning liquid, with two partition walls 19 inside the sedimentation tank 12. The upper edges of the two partition walls 19 have intersecting overflow outlets 16, dividing the sedimentation tank 12 into three equal sub-tanks. Each sub-tank is covered with a stainless steel sub-tank cover 17, and a guardrail 18 is installed around the top of the sedimentation tank 12 (e.g., ...). Figure 3 , Figure 4 and Figure 5 (As shown). A submersible pump 13 (model: DW25-200) is installed on the dividing tank cover 17 on one side of the sedimentation tank 12. The outlet of the submersible pump 13 has a tee pipe, which is connected to the second control valve 24 and the third control valve 25 respectively. The second control valve 24 is connected to the molten sulfur clearing liquid heat exchanger 15 through a pipe, and the third control valve 25 is connected to the circulation tank 4 (as shown). Figure 2 (As shown). The stainless steel dividing cover 17 on top of the sedimentation tank 12, in addition to being connected to the molten sulfur clear liquid inlet 21, is also connected to a volatile gas interface 20, which can introduce volatile gases through the first control valve 14 to the volatile gas (VOCs) treatment device. The liquid level detection hole 23 and observation hole 22 on the middle dividing cover 17 of the molten sulfur clear liquid sedimentation tank 12 can be used to detect and observe the state of the molten sulfur clear liquid in the tank. The upper edge of the partition wall 19 is 10-15 cm lower than the bottom edge of the reinforcing rib 26.

[0019] Example: A preferred embodiment of this utility model is described below. Under normal production conditions, coke oven gas passes through desulfurization tower 1 to remove hydrogen sulfide and hydrogen cyanide before entering the next process. Sulfur foam floating on top of regeneration tower 6 flows by gravity into sulfur foam tank 8, where it is heated and stirred. The sulfur foam is then pumped by foam pump 10 to sulfur melting kettle 11. The sulfur melting kettle 11 is heated to above 130°C using indirect steam, causing the sulfur to melt and separate from the sulfur slag. The molten sulfur, after cooling, becomes the sulfur product. The molten sulfur liquid containing sulfur slag separated from the sulfur melting kettle enters circulation tank 4 and returns to the desulfurization system for production. Because the sulfur slag carried by the molten sulfur liquid returning to the desulfurization system accumulates in the desulfurization liquid for a long time, it causes pipe blockage, increases the resistance of the desulfurization tower, and forces the desulfurization system to shut down for dredging. Meanwhile, the untreated clear liquid is directly returned to the desulfurization system. Due to the excessively high temperature, the temperature of the desulfurization mother liquor in the desulfurization system cannot be maintained within the process control range of about 40℃, which affects the stable operation of the desulfurization system, deteriorates the desulfurization effect, and causes the hydrogen sulfide after the tower to exceed the design value, affecting the emission of sulfur dioxide pollutants from subsequent coal gas users.

[0020] This utility model device is mainly applicable to the sedimentation and cooling of the clarified liquid after sulfur melting. The clarified liquid from the sulfur melting kettle 11 is led to the sedimentation tank 12 through a pipeline. The sedimentation tank 12 is divided into three sedimentation sub-tanks of equal volume by two partition walls 19. The upper ends of the two partition walls 19 between the sedimentation sub-tanks are provided with staggered overflow ports 16, which can give full play to the sedimentation function of each sedimentation sub-tank. At the same time, it is also convenient to collect the sulfur slag settled at the bottom of the sedimentation sub-tanks, which is easy to clean with small excavating machinery without affecting the operation of other sedimentation tanks. After passing through the sedimentation tank 12, the clarified liquid is pressurized and extracted at the end of the sedimentation tank 12 by a submersible pump 13. Depending on the temperature of the desulfurization system, the amount of clarified liquid entering the heat exchanger 15 is adjusted by the second control valve 24 to meet the temperature requirements of the desulfurization system. At the same time, when the heat exchanger 15 is under maintenance or heat exchange is not required, it can be returned to the circulation tank 4 by the second control valve 25.

[0021] This invention effectively clarifies, separates, and cools molten sulfur liquid, minimizing its impact on the desulfurization system. It provides a new treatment method for molten sulfur liquid in wet desulfurization processes using sodium as the alkali source for coke oven gas. Furthermore, considering the characteristics of molten sulfur liquid, the design of the clearing tank incorporates leak-proof features. All tank covers 17, guardrails 18, and pipe fittings are made of 304 stainless steel, ensuring long-term stable operation of the device. The removal of the separated molten sulfur residue at the bottom can be achieved using conventional excavators, eliminating the need for specialized cleaning equipment. This significantly reduces safety risks and labor intensity associated with cleaning molten sulfur residue, while also saving on cleaning costs. Furthermore, the stainless steel dividing cover 17 on the upper part of the molten sulfur clearing liquid sedimentation tank 12, in addition to the molten sulfur clearing liquid inlet 21, also has a volatile gas interface 20, which introduces volatile gases into the volatile gas (VOCs) treatment device to avoid the generation of odors on site. The liquid level detection hole 23 and observation hole 22 set on the dividing cover 17 of the molten sulfur clearing liquid sedimentation tank 12 help to observe and detect the liquid level in the sedimentation tank 12, facilitating adjustments to production operations. This device has a simple structure, stable operation, requires no special maintenance or repair, and has almost zero operating and maintenance costs.

Claims

1. An improved molten sulfur cleaning solution treatment device, characterized in that, The system includes a clear liquid sedimentation tank connected to the outlet of the sulfur melting kettle. The clear liquid sedimentation tank has a rectangular box structure with a dividing tank cover on the top surface. Reinforcing ribs are provided below the dividing tank cover, and a guardrail is installed along the outer perimeter of the top of the clear liquid sedimentation tank. A partition wall is provided inside the clear liquid sedimentation tank, with an overflow outlet at one end of the partition wall. A support is provided at one end of the dividing tank cover on one side of the clear liquid sedimentation tank, with a volatile gas interface and a sulfur melting clear liquid inlet on the support. An observation hole and a liquid level detection hole are provided on the dividing tank cover in the middle of the clear liquid sedimentation tank, and a submersible pump interface is provided on the dividing tank cover on the other side of the clear liquid sedimentation tank. The volatile gas interface is connected to a volatile gas treatment device via a pipeline and a first control valve. The submersible pump outlet is connected to a second control valve and a third control valve via pipelines. The second control valve is connected to a circulation tank via a pipeline, and the third control valve is connected to a heat exchanger via a pipeline. The heat exchanger has a cooling water inlet and a cooling water outlet, and is also connected to the circulation tank.

2. The improved molten sulfur cleaning solution treatment device according to claim 1, characterized in that, The sedimentation tank has at least two partition walls, and the overflow outlets above are staggered.

3. The improved molten sulfur cleaning solution treatment device according to claim 1, characterized in that, The partition wall separates the sedimentation tank into equal-volume sub-tanks.

4. The improved molten sulfur cleaning solution treatment device according to claim 1, characterized in that, The pool cover is a rectangular stainless steel plate.

5. The improved molten sulfur cleaning solution treatment device according to claim 1, characterized in that, The top edge of the partition wall is 10cm to 15cm lower than the bottom edge of the reinforcing rib.

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