Self-circulation desulfurization device capable of coping with unstable acid gas amount

Abstract

The utility model relates to the technical field of acid gas desulfurization, and discloses a self-circulation desulfurization device capable of coping with unstable acid gas amount, which comprises an acid gas liquid separation tank and an absorption oxidation tower, the absorption oxidation tower is provided with an acid gas distributor and air distributors, the number of the air distributors in the absorption oxidation tower is multiple, and the multiple air distributors are evenly arranged around the acid gas distributor by a circle; a solution outlet is formed in the side wall of the absorption oxidation tower close to the height of the air distributor, a solution spraying opening is formed in the inner top of the absorption oxidation tower close to the upper part of the acid gas distributor, an injection pump and a heat exchanger are arranged outside the absorption oxidation tower, and the solution outlet of the absorption oxidation tower, the injection pump, the heat exchanger and the solution spraying opening of the absorption oxidation tower are sequentially connected; the technical problem that an existing single-tower self-circulation desulfurization device is low in acid gas treatment capacity is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to acid gas desulfurization technical field, specifically related to a self -circulation desulfurization device that can deal with acid gas quantity unstable. BACKGROUND

[0002] In the industrial production field such as natural gas purification, petroleum chemical industry and coal gasification, by-products containing hydrogen sulfide (H2S) and other acid gases are inevitably produced in the industrial production process, these gases not only have characteristics such as toxicity, corrosiveness and malodor, pose a threat to human health, cause serious corrosion to production equipment, but also can cause environmental pollution problems. Therefore, it is necessary to efficiently, greenly and energy-savingly treat these sulfur-containing acid gases to realize effective recovery and utilization of sulfur resources.

[0003] At present, the natural gas purification, petroleum chemical industry and coal gasification industries generally face the problem of unstable production process products and large yield fluctuations, which directly leads to large changes in the amount of by-product sulfur-containing acid gases. The design processing load of the traditional self-circulation acid gas desulfurization device is usually limited to the range of 0-110%, when the actual acid gas amount exceeds this upper limit of processing, in order to maintain the stable operation of the system, it is often necessary to take measures to direct part of the acid gas into a flare for combustion. This approach not only significantly reduces the sulfur recovery rate, causing waste of sulfur resources, but also the harmful gases produced during combustion can cause secondary air pollution, and also pose a potential threat to the service life of the desulfurization equipment.

[0004] The current technology mainly uses complex iron desulfurization technology as the oxidation desulfurization method. This technology mainly includes double-tower desulfurization process and single-tower self-circulation desulfurization process, among which the single-tower self-circulation process has been widely used in the acid gas desulfurization industry due to its advantages of fewer equipment, smaller land occupation and simple operation. However, when facing the drastic fluctuations in acid gas amount during the production process, the existing single-tower self-circulation desulfurization device still cannot completely treat all acid gases, especially when the acid gas load exceeds the design range, it also faces difficulties in treatment and has to take emergency measures such as flare combustion, thereby limiting the improvement of sulfur recovery efficiency. SUMMARY

[0005] The utility model intends to provide a self-circulation desulfurization device that can deal with unstable acid gas amount to solve the technical problem of low acid gas treatment capacity of the existing single-tower self-circulation desulfurization device.

[0006] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a self-circulation desulfurization device that can deal with unstable acid gas amount, comprising: an acid gas separation tank for separating water and impurities in the acid gas, an absorption oxidation tower for desulfurization treatment of the acid gas, and a filter for filtering treatment of sulfur slurry generated after desulfurization.

[0007] The acid gas outlet of the acid gas separation tank is connected with the acid gas inlet of the absorption oxidation tower, the absorption oxidation tower is provided with an acid gas distributor, the inlet of the acid gas distributor is connected with the acid gas inlet of the absorption oxidation tower, and the acid gas distributor is a double-layer acid gas gas distributor; the absorption oxidation tower is also provided with an air distributor, the absorption oxidation tower is provided with an oxidation air blower for providing air, the air outlet of the oxidation air blower is connected with the air inlet of the absorption oxidation tower, and the air distributor is connected with the air inlet of the absorption oxidation tower; the air distributor is multiple, and the multiple air distributors are uniformly arranged around the acid gas distributor once.

[0008] The absorption oxidation tower is provided with a solution outlet near the air distributor, a solution spraying port is arranged on the inner top of the absorption oxidation tower near the upper side of the acid gas distributor, a jet pump and a heat exchanger for cooling the flowing solution are arranged outside the absorption oxidation tower, the solution outlet of the absorption oxidation tower is connected with the inlet of the jet pump, the outlet of the jet pump is connected with the inlet of the heat exchanger, and the outlet of the heat exchanger is connected with the solution spraying port of the absorption oxidation tower.

[0009] The absorption oxidation tower and the filter are also provided with a sulfur slurry pump and a filter pump, the sulfur slurry outlet at the bottom of the absorption oxidation tower is connected with the inlet of the sulfur slurry pump, and the outlet of the sulfur slurry pump is connected with the inlet of the filter.

[0010] The principle and advantages of the scheme are as follows: in actual application, the acid gas separation tank is used for preliminarily separating water and impurities in the acid gas, so as to ensure the smooth progress of the subsequent desulfurization process; the double-layer acid gas gas distributor is arranged in the absorption oxidation tower, compared with the traditional single-layer gas distributor, the design significantly improves the treatment load of the acid gas, and the design treatment capacity can reach 200% in theory.

[0011] The air distributor arranged in the tower is provided with air provided by the external oxidation air blower, is used for the regeneration of the catalyst and the promotion of the reaction, and is uniformly distributed around, so that the regeneration efficiency of the catalyst is improved, the desulfurization reaction is promoted, the oxidation capacity of the solution is also improved, and the stability and efficiency of the desulfurization process are maintained.

[0012] The solution in the absorption oxidation tower after the cooling treatment is sprayed into the tower again through the spraying port to form a self-circulation; this process not only maintains the temperature stability of the solution, but also helps to eliminate the sulfur foam on the liquid surface in the tower, and further improves the desulfurization efficiency; the filtrate is returned to the absorption oxidation tower through the filter backflow pump, so that the resource is recycled.

[0013] The device can cope with the sharp fluctuation of acid gas amount, improve the processing capacity of acid gas, avoid the corrosion of equipment and environmental pollution caused by acid gas combustion, prolong the service life of related equipment, and reduce the maintenance cost. At the same time, through efficient recovery of sulfur resources, the emission of sulfur dioxide is reduced, and the environmental protection cost is saved.

[0014] As an improvement, the outlet of the sulfur slurry pump is also connected with the sulfur slurry backflow port of the absorption oxidation tower.

[0015] The beneficial effect of this improvement is that when the filter machine is suspended for any reason or other reason, the sulfur slurry is backflowed to the absorption oxidation tower through the sulfur slurry pump, realizing the circulating flow of the sulfur slurry. This improvement avoids the problems of precipitation and blockage that may be caused by the long-term standing of the sulfur slurry in the absorption oxidation tower, ensuring the continuity and stability of the desulfurization process. At the same time, the backflow of the sulfur slurry can also react with fresh acid gas again, further improving the sulfur recovery rate.

[0016] As an improvement, a medicament pump is further arranged outside the absorption oxidation tower for supplementing the desulfurization liquid, and the outlet of the medicament pump is connected with the medicament filling port of the absorption oxidation tower.

[0017] The beneficial effect of this improvement is that the introduction of the medicament pump enables the desulfurization liquid to be supplemented and adjusted as needed, ensuring the continuous and efficient desulfurization reaction. When the effective components in the desulfurization liquid are reduced or the reaction efficiency is reduced, the fresh desulfurization liquid or catalyst can be timely filled through the medicament pump, which can effectively maintain the stability and desulfurization efficiency of the desulfurization process. This improvement improves the flexibility and adaptability of the device, prolongs the desulfurization period, and reduces the downtime maintenance time.

[0018] As an improvement, the acid gas separation tank is a horizontal acid gas separation tank.

[0019] The beneficial effect of this improvement is that the horizontal acid gas separation tank has better gas-liquid mechanical separation performance than the vertical separation tank, and can more effectively remove the moisture and impurities in the acid gas. At the same time, the horizontal design is convenient for operation, installation and maintenance, and has large processing capacity, which can better cope with the situation of increasing acid gas load. This improvement improves the separation efficiency and reliability of the acid gas separation tank, and provides high-quality acid gas input for the subsequent desulfurization process.

[0020] As an improvement, a sulfur outside transport vehicle is further arranged outside the filter machine, and the sulfur paste outlet of the filter machine is connected with the inlet of the sulfur outside transport vehicle.

[0021] The beneficial effects of the improvement are: the introduction of the sulfur export vehicle realizes the timely export and treatment of sulfur paste, avoids the problems of blockage and pollution caused by long-term accumulation of sulfur paste in the filter, and facilitates the transportation of sulfur paste to the designated location for further processing or treatment, thereby realizing the effective utilization and recovery of sulfur resources.

[0022] As an improvement, the upper part of the absorption oxidation tower is in the shape of a cylindrical barrel, the lower part of the absorption oxidation tower is in the shape of a cone, and the upper and lower parts of the absorption oxidation tower are connected through.

[0023] The beneficial effects of the improvement are: the design of the upper cylindrical barrel and the lower cone of the absorption oxidation tower makes full use of the space inside the tower, while avoiding the influence of the injection of acid gas and air on the sinking of sulfur slurry. The installation of the acid gas distributor and the air distributor near the bottom of the cylindrical upper part is beneficial to the uniform distribution and mixing of acid gas and air, and improves the efficiency and uniformity of the desulfurization reaction. This improvement optimizes the structural design of the absorption oxidation tower and improves the stability and efficiency of the desulfurization process.

[0024] As an improvement, the upper part of the absorption oxidation tower is also provided with a partition plate, the partition plate is located between the acid gas distributor and the air distributor, and the partition plate is in the shape of a circumference surrounding the acid gas distributor on both sides.

[0025] The beneficial effects of the improvement are: the introduction of the partition plate buffers the counterflow gas between the acid gas distributor and the air distributor, reducing the generation of sulfur foam. At the same time, the sprayed desulfurization liquid is poured from the inside of the partition plate, directly acting on the acid gas distributor area, so that the desulfurization liquid and the acid gas are fully contacted and reacted. The solution after desulfurization reaction is dispersed to all directions from the lower end of the partition plate, and finally enters the cooling cycle of the jet pump and the heat exchanger, realizing the one-way flow of the desulfurization liquid in the absorption oxidation tower. This improvement improves the acid gas desulfurization capacity, reduces the energy consumption and operating cost. At the same time, the design of the partition plate also enhances the stability and uniformity of the flow field in the tower, which is beneficial to the continuity and stability of the desulfurization process. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 The structure of the embodiment of the present application is shown in the figure. DETAILED DESCRIPTION

[0027] The following will be further described in detail through specific embodiments:

[0028] The reference signs in the drawings of the specification include: acid gas separation tank 1, acid water discharge pump 2, absorption oxidation tower 3, acid gas distributor 3-1, air distributor 3-2, jet pump 4, heat exchanger 5, oxidation air blower 6, sulfur slurry pump 7, filter 8, filtrate return pump 9, sulfur delivery vehicle 10 and reagent pump 11.

[0029] Embodiment

[0030] Basically as shown in the accompanying Figure 1 A self-circulating desulfurization device capable of dealing with unstable amount of acid gas includes key equipment such as acid gas separation tank 1, acid water discharge pump 2, absorption oxidation tower 3, jet pump 4, heat exchanger 5, oxidation air blower 6, sulfur slurry pump 7, filter 8, filter return pump 9, sulfur delivery vehicle 10 and reagent pump 11.

[0031] The acid gas separation tank 1 is used to separate the moisture and other impurities carried in the acid gas. The acid liquid outlet of the acid gas separation tank 1 is connected with the acid water discharge pump 2, and the separated acid water is discharged to the outside for treatment. The acid gas outlet of the acid gas separation tank 1 is connected with the acid gas inlet of the absorption oxidation tower 3. The acid gas separation tank 1 is a horizontal acid gas separation tank 1.

[0032] The absorption oxidation tower 3 is used for desulfurization treatment of sulfur-containing acid gas. The absorption oxidation tower 3 is internally provided with an acid gas distributor 3-1, which is connected with the acid gas inlet of the absorption oxidation tower 3, for uniformly dispersing the acid gas in the absorption oxidation tower 3 and fully contacting the desulfurization liquid in the absorption oxidation tower 3. The acid gas inlet of the acid gas distributor 3-1 is located at the top of the absorption oxidation tower 3, and the acid gas distributor 3-1 is located at the center of the absorption oxidation tower 3, so that the acid gas output from the acid gas separation tank 1 is input from the top of the absorption oxidation tower 3 to the inside of the absorption oxidation tower 3 and diffuses to the surrounding at the central position. The acid gas distributor 3-1 is a double-layer acid gas gas distributor to improve the acid gas treatment load.

[0033] The air outlet of the oxidation air blower 6 is connected with the air inlet of the absorption oxidation tower 3, for providing oxygen to the absorption oxidation tower 3 for regeneration of the catalyst in the desulfurization liquid. The absorption oxidation tower 3 is internally provided with a plurality of air distributors 3-2, which are connected with the air inlet of the absorption oxidation tower 3, for uniformly distributing the air in the desulfurization liquid. The plurality of air distributors 3-2 are uniformly arranged around the acid gas distributor 3-1.

[0034] The side wall of the absorption oxidation tower 3 is provided with a solution outlet near the air distributor 3-2, and the inner top of the absorption oxidation tower 3 is provided with a solution spraying port above the acid gas distributor 3-1; the solution outlet of the absorption oxidation tower 3 is connected with the inlet of the jet pump 4, the outlet of the jet pump 4 is connected with the inlet of the heat exchanger 5, and the outlet of the heat exchanger 5 is connected with the solution spraying port of the absorption oxidation tower 3, so that the desulfurization liquid in the absorption oxidation tower 3 is pressurized by the jet pump 4 and cooled by the heat exchanger 5, and then the desulfurization liquid enters the absorption oxidation tower 3 in the form of spraying, and fully contacts and reacts with the acid gas. At the same time, the spraying can also be used to eliminate the sulfur foam on the liquid surface.

[0035] The bottom of the absorption oxidation tower 3 is also provided with a sulfur slurry outlet for discharging the sulfur slurry generated by the reaction. The sulfur slurry outlet of the absorption oxidation tower 3 is connected with the inlet of the sulfur slurry pump 7, the outlet of the sulfur slurry pump 7 is connected with the inlet of the filter 8 and the sulfur slurry backflow port of the absorption oxidation tower 3 respectively; the sulfur slurry is provided to the filter 8, and the circulation flow of the sulfur slurry is realized when the filter 8 is temporarily stopped to avoid blocking the sulfur slurry outlet.

[0036] The filtrate outlet of the filter 8 is connected with the inlet of the filtration backflow pump 9, and the outlet of the filtration backflow pump 9 is connected with the filtration backflow port of the absorption oxidation tower 3; the sulfur slurry is filtered by the filter 8 to form solid sulfur paste, the sulfur paste outlet of the filter 8 is connected with the inlet of the sulfur transport vehicle 10; the sulfur paste is transported and recovered. The outlet of the reagent pump 11 is connected with the reagent filling port of the absorption oxidation tower 3, and the inlet of the reagent pump 11 is connected with the desulfurization liquid storage tank, which is used to provide new desulfurization liquid for the absorption oxidation tower 3.

[0037] The upper part of the absorption oxidation tower 3 is in the shape of a cylindrical barrel, the lower part of the absorption oxidation tower 3 is in the shape of a cone, and the upper and lower parts of the absorption oxidation tower 3 are connected through each other. The acid gas distributor 3-1 and the air distributor 3-2 are both installed on the cylindrical barrel-shaped upper part of the absorption oxidation tower 3 and are close to the bottom of the cylindrical barrel-shaped upper part.

[0038] The upper part of the absorption oxidation tower 3 is also provided with a partition plate between the acid gas distributor 3-1 and the air distributor 3-2, and the partition plate is in the shape of a circumference surrounding the acid gas distributor 3-1 on both sides. The upper and lower ports surrounded by the partition plate are in an open state, so that the solutions on both sides of the partition plate flow.

[0039] The specific implementation process is as follows:

[0040] The acid gas is first separated from the water and other impurities carried in the acid gas by the acid gas separator 1 and then enters the absorption oxidation tower 3, and the acid water is discharged outside by the acid water discharge pump 2; the acid gas is uniformly distributed in the desulfurization liquid in the absorption oxidation tower 3 by the acid gas distributor 3-1 to react.

[0041] The solution in the absorption oxidation tower 3 is pressurized by the jet pump 4 and cooled by the heat exchanger 5, and then enters the absorption oxidation tower 3 in the form of spraying, which can eliminate the sulfur foam on the liquid surface of the absorption oxidation tower 3 while maintaining the temperature of the solution; the air is pressurized by the oxidation air blower 6 and then enters the absorption oxidation tower 3, and is uniformly distributed in the desulfurization liquid by the air distributor 3-2 for catalyst regeneration.

[0042] The sulfur slurry at the bottom of the absorption oxidation tower 3 enters the filter 8 through the sulfur slurry pump 7, and after filtration, solid sulfur paste is generated and is transported away by the sulfur export vehicle 10, and the generated filtrate is pumped back into the absorption oxidation tower 3 by the filter backflow pump 9. When the filter 8 is not working, the sulfur slurry at the bottom of the absorption oxidation tower 3 is directly pumped back into the absorption oxidation tower 3 by the sulfur slurry pump 7 through the sulfur slurry backflow pipeline to realize circulation.

[0043] The above is only an embodiment of the present application, and the well-known specific technical solutions and / or common knowledge of characteristics in the scheme are not described in detail. It should be noted that for those skilled in the art, without departing from the technical scheme of the present application, a number of modifications and improvements can be made, which should also be considered as the protection scope of the present application, and these will not affect the effect and practicality of the present application. The protection scope of the present application should be subject to the content of its claims, and the specific implementation mode and the like in the specification can be used to explain the content of the claims.

Claims

1. A self-circulation desulfurization device capable of coping with unstable amount of acid gas, characterized by comprising: The application relates to an acid gas separation tank for separating water and impurities in acid gas, an absorption oxidation tower for desulfurization treatment of the acid gas, and a filter for filtering treatment of sulfur slurry generated after desulfurization. An acid gas outlet of the acid gas separation tank is connected with an acid gas inlet of the absorption oxidation tower, an acid gas distributor is arranged in the absorption oxidation tower, an inlet of the acid gas distributor is connected with the acid gas inlet of the absorption oxidation tower, the acid gas distributor is a double-layer acid gas gas distributor, an air distributor is further arranged in the absorption oxidation tower, an oxidation air blower for providing air is arranged outside the absorption oxidation tower, an air outlet of the oxidation air blower is connected with an air inlet of the absorption oxidation tower, the air distributor is connected with the air inlet of the absorption oxidation tower, the air distributor is multiple, and the multiple air distributors are arranged uniformly around the acid gas distributor. A solution outlet is arranged on a side wall of the absorption oxidation tower close to the air distributor, a solution spraying port is arranged on an inner top of the absorption oxidation tower close to the upper portion of the acid gas distributor, a jet pump and a heat exchanger for cooling the flowing solution are arranged outside the absorption oxidation tower, the solution outlet of the absorption oxidation tower is connected with an inlet of the jet pump, an outlet of the jet pump is connected with an inlet of the heat exchanger, and an outlet of the heat exchanger is connected with the solution spraying port of the absorption oxidation tower. A sulfur slurry pump and a filter pump are further arranged between the absorption oxidation tower and the filter, a sulfur slurry outlet at the bottom of the absorption oxidation tower is connected with an inlet of the sulfur slurry pump, an outlet of the sulfur slurry pump is connected with an inlet of the filter, a filtrate outlet of the filter is connected with an inlet of a filter backflow pump, and an outlet of the filter backflow pump is connected with a filtrate backflow port of the absorption oxidation tower. The outlet of the sulfur slurry pump is further connected with a sulfur slurry backflow port of the absorption oxidation tower.

2. The self-circulating desulfurization device capable of dealing with unstable acid gas amount according to claim 1, characterized in that: A medicament pump for supplementing desulfurization liquid is further arranged outside the absorption oxidation tower, and an outlet of the medicament pump is connected with a medicament filling port of the absorption oxidation tower.

3. The self-circulating desulfurization device capable of dealing with unstable acid gas amount according to claim 2, characterized in that: The acid gas separation tank is a horizontal acid gas separation tank.

4. The self-circulating desulfurization device capable of dealing with unstable acid gas amount according to claim 3, characterized in that: A sulfur conveying vehicle is further arranged outside the filter, and a sulfur paste outlet of the filter is connected with an inlet of the sulfur conveying vehicle.

5. The self-circulating desulphurization device capable of dealing with unstable acid gas amount according to claim 4, characterized in that: The upper portion of the absorption oxidation tower is in a cylindrical tube shape, the lower portion of the absorption oxidation tower is in a conical shape, and the upper portion and the lower portion of the absorption oxidation tower are connected through each other; the acid gas distributor and the air distributor are both arranged on the cylindrical tube-shaped upper portion of the absorption oxidation tower and close to the bottom of the cylindrical tube-shaped upper portion.

6. The self-circulating desulfurization device capable of dealing with unstable acid gas amount according to claim 5, characterized in that: A partition plate is further arranged in the upper portion of the absorption oxidation tower, the partition plate is located between the acid gas distributor and the air distributor, the partition plate is in a circumferential shape surrounding the acid gas distributor, and the upper and lower ports surrounded by the partition plate are in an open shape.

7. The self-circulating desulphurization device capable of dealing with unstable acid gas amount according to claim 6, characterized in that: ​

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