A mother liquor defoaming system for coking ammonium sulfate production

Abstract

The utility model discloses a mother liquor defoaming system for coking ammonium sulfate production, including the sedimentation tank of bottom is equipped with the slope, set in the sedimentation tank bottom slope high place's first purifier and second purifier, first purifier is connected with second purifier through first pipeline, be equipped with sulfuric acid delivery pump on first pipeline, and second purifier sends concentrated sulfuric acid of ammonium sulfate through second pipeline. Through the impurity deposition, cooperate first purifier and second purifier, can eliminate the foam generated in the production process, purify the mother liquor in the production process, and the impurity contained in the mother liquor is proposed.

Description

Technical Field

[0001] This utility model relates to the field of coking gas purification, specifically a mother liquor defoaming system for coking ammonium sulfate production. Background Technology

[0002] In the coking industry, coke production generates a large amount of coke oven gas, which contains significant amounts of hydrogen sulfide, tar, benzene, ammonia, and other substances. Therefore, coking plants typically equip their production facilities with hydrogen sulfide removal systems and ammonia washing systems. Currently, over 90% of coking plants use ammonium sulfate processes to recover ammonia from the gas, and over 80% use wet desulfurization to remove hydrogen sulfide. After hydrogen sulfide removal, to rationally utilize this sulfur resource, a large number of desulfurization foam (waste liquid) sulfuric acid production systems have been newly built in recent years. The concentrated sulfuric acid produced from this sulfur resource is generally used in the ammonium sulfate process, achieving internal resource utilization of sulfur elements.

[0003] During the process of using self-produced concentrated sulfuric acid in the ammonium sulfate process, a large amount of black acidic foam is generated due to the addition of self-produced concentrated sulfuric acid. The instantaneous generation of this foam is large, occupying the internal space of the equipment in the ammonium sulfate production process. It frequently overflows from the observation hole at the top of the full flow tank of the production equipment, corroding the ground foundation and surrounding equipment, seriously affecting the environment and safe production in the area. Utility Model Content

[0004] The purpose of this invention is to solve the above problems and provide a mother liquor defoaming system for coking ammonium sulfate production, which can eliminate foam generated during the production process, purify the mother liquor during the production process, and eliminate impurities contained in the mother liquor.

[0005] The technical solution adopted by this utility model to solve its technical problem is:

[0006] A defoaming system for mother liquor in coking ammonium sulfate production includes a settling tank with a slope at the bottom, a primary purifier and a secondary purifier located at the high point of the slope at the bottom of the settling tank. The primary purifier is connected to the secondary purifier through a first pipe. A sulfuric acid delivery pump is installed on the first pipe. The secondary purifier delivers concentrated sulfuric acid for ammonium sulfate through a second pipe.

[0007] Furthermore, a clean acid delivery pump is installed on the second pipeline.

[0008] Furthermore, a third pipe is provided at the lower end of the secondary purifier, one end of which is connected to the lower end of the secondary purifier, and the other end of which is connected to the upper end of the settling tank.

[0009] Furthermore, the third pipeline is equipped with an underground sulfuric acid tank and an underground sulfuric acid tank pump.

[0010] Furthermore, the bottom slope of the settling tank is connected to the intermediate sulfuric acid tank via a fourth pipe, and the fourth pipe is equipped with an impurity conveying pump.

[0011] Furthermore, the bottom of the sulfuric acid intermediate tank is a conical tank, and a fifth pipe is provided at the bottom of the sulfuric acid intermediate tank, with an acid sludge conveying pump installed on the fifth pipe.

[0012] Furthermore, the fifth pipeline is equipped with a first valve at the lower end of the sulfuric acid intermediate tank, and also includes a branch pipeline. The upper end of the branch pipeline is connected to the upper end of the sulfuric acid intermediate tank, and the lower end of the branch pipeline is connected to the fifth pipeline. The branch pipeline is equipped with a second valve, and the output end of the fifth pipeline is connected to the feed pipeline of the settling tank.

[0013] Furthermore, the secondary purification filter is mainly divided into three layers for purifying concentrated sulfuric acid. The top layer is a polytetrafluoroethylene filter element layer, the second layer is an activated carbon adsorption layer, and the bottom layer is an ion exchange layer. All three purification layers of the secondary purifier are flange-inserted and detachable structures.

[0014] Furthermore, there are two of each of the settling tank, primary purifier, secondary purifier, and sulfuric acid transfer pump.

[0015] The beneficial effects of this utility model are:

[0016] 1. This utility model includes a settling tank with a sloping bottom, a primary purifier and a secondary purifier located at the high point of the sloping bottom of the settling tank. The primary purifier is connected to the secondary purifier via a first pipe, and a sulfuric acid delivery pump is installed on the first pipe. The secondary purifier delivers concentrated ammonium sulfate sulfuric acid through a second pipe. Through impurity precipitation, in conjunction with the primary and secondary purifiers, foam generated during the production process can be eliminated, the mother liquor during the production process can be purified, and impurities contained in the mother liquor can be removed. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the present invention.

[0019] In the diagram: 1. Settling tank; 2. Primary purifier; 3. Secondary purifier; 4. First pipeline; 5. Sulfuric acid transfer pump; 6. Second pipeline; 7. Clean acid transfer pump; 8. Third pipeline; 9. Underground sulfuric acid tank; 10. Underground sulfuric acid tank pump; 11. Fourth pipeline; 12. Intermediate sulfuric acid tank; 13. Impurity transfer pump; 14. Fifth pipeline; 15. Sludge transfer pump; 16. First valve; 17. Branch pipeline; 18. Second valve. Detailed Implementation

[0020] To enable those skilled in the art to better understand the technical solutions of this utility model, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0021] like Figure 1 As shown, a defoaming system for mother liquor in coking ammonium sulfate production includes a settling tank 1 with a slope at the bottom, a primary purifier 2 and a secondary purifier 3 located at the high point of the slope at the bottom of the settling tank 1. The primary purifier 2 is connected to the secondary purifier 3 through a first pipe 4. A sulfuric acid transfer pump 5 is installed on the first pipe 4. One end of the first pipe 4 is connected to the bottom of the primary purifier 2, and the other end of the first pipe 4 is connected to the bottom of the secondary purifier 3. The secondary purifier 3 delivers concentrated sulfuric acid for ammonium sulfate through a second pipe 6. One end of the second pipe 6 is connected to the upper end of the secondary purifier 3.

[0022] The first-stage purifier 2 consists of a multi-layer titanium alloy metal filter with different pore sizes and corresponding accessories. It is resistant to the corrosion of concentrated sulfuric acid. The filter mesh pore size is selected based on data such as the size of impurities obtained from the analysis of concentrated sulfuric acid. A suitable filter mesh is selected according to the size of the impurity particles in the concentrated sulfuric acid, effectively selectively filtering particulate matter. After a period of use, the first-stage purifier may become partially clogged, requiring manual backflushing to ensure its continuous filtration capacity. The first-stage purifier can be installed inside or outside the tank as needed.

[0023] By setting up a slope at the bottom of the sloping sedimentation tank, the collection effect of impurities after sedimentation is improved, especially when concentrated sulfuric acid contains a lot of impurities, the collection effect of sediment is more obvious.

[0024] Concentrated sulfuric acid produced from sulfur foam first enters a sulfuric acid inclined settling tank for sedimentation. In this tank, impurities are initially removed through sedimentation. The concentrated sulfuric acid at the upper part of the higher side of the settling tank enters a primary purifier. After purification in the primary purifier, larger particles are further removed. The sulfuric acid then enters a sulfuric acid transfer pump, which delivers it to a secondary purifier. The concentrated sulfuric acid after the secondary purifier can then be pumped to the ammonium sulfate production unit for use. Through impurity sedimentation, in conjunction with the primary and secondary purifiers, foam generated during production can be eliminated, the mother liquor purified, and impurities removed from the mother liquor.

[0025] The second pipeline 6 is equipped with a purified acid delivery pump 7.

[0026] The lower end of the secondary purifier 3 is provided with a third pipe 8. One end of the third pipe 8 is connected to the lower end of the secondary purifier 3, and the other end of the third pipe 8 is connected to the upper end of the settling tank 1.

[0027] The third pipeline 8 is equipped with a sulfuric acid underground tank 9 and a sulfuric acid underground tank pump 10. The secondary purifier is equipped with an automatic backwashing system. When the equipment resistance increases, it can automatically backwash the inside of the equipment. The concentrated sulfuric acid containing impurities after backwashing is placed in the sulfuric acid underground tank and pumped back to the slope settling tank for further separation by the sulfuric acid underground tank pump.

[0028] The bottom slope of the settling tank 1 is connected to the sulfuric acid intermediate tank 12 via a fourth pipe 11, and an impurity conveying pump 13 is installed on the fourth pipe 11.

[0029] The bottom of the sulfuric acid intermediate tank 12 is a conical trough, and a fifth pipe 14 is provided at the bottom of the sulfuric acid intermediate tank 12. An acid sludge conveying pump 15 is installed on the fifth pipe 14. The sulfuric acid intermediate tank 12 is set up to further separate concentrated sulfuric acid containing more impurities. The part at the bottom with more sediment is sent to process units with lower acid quality requirements, such as sewage treatment. The middle and upper layers are filled with relatively clean concentrated sulfuric acid and sent back to the slope settling tank via the acid sludge conveying pump.

[0030] The fifth pipeline 14 is equipped with a first valve 16 located at the lower end of the sulfuric acid intermediate tank 12. It also includes a branch pipeline 17, the upper end of which is connected to the upper end of the sulfuric acid intermediate tank 12, and the lower end of which is connected to the fifth pipeline 14. The connection point is located below the valve on the fifth pipeline 14. A second valve 18 is provided on the branch pipeline 17. The output end of the fifth pipeline 14 is connected to the feed pipeline of the settling tank 1. When the valve on the fifth pipeline 14 is closed, the valve on the branch pipeline is closed, and when the valve on the branch pipeline is open, the clean portion from the upper end of the sulfuric acid intermediate tank 12 is transported to the feed pipeline of the settling tank 1 for re-settling. A branch pipe is located at the lower end of the acid sludge conveying pump 15 on the fifth pipeline 14, which sends the portion with a larger amount of sediment to process units with lower acid quality requirements, such as wastewater treatment.

[0031] The concentrated sulfuric acid produced by sulfur foam first enters the sulfuric acid inclined settling tank for sedimentation. In the sulfuric acid inclined settling tank, impurities are initially removed by sedimentation. Some of the solid particles and suspended impurities with a density higher than that of sulfuric acid settle down in the inclined settling tank. The settled part is sent to the sulfuric acid intermediate tank for stratification treatment by the impurity conveying pump. The clean concentrated sulfuric acid at the top is sent back to the inclined settling tank by the acid sludge conveying pump. The concentrated sulfuric acid at the bottom of the sulfuric acid intermediate tank, which contains more impurities, is sent to process units with lower acid quality requirements, such as sewage treatment.

[0032] The secondary purification filter consists of three layers for purifying concentrated sulfuric acid. The top layer is a polytetrafluoroethylene (PTFE) filter element, primarily used to further remove particulate and flocculent impurities from the concentrated sulfuric acid. The second layer is an activated carbon adsorption layer, which adsorbs extremely fine particulate impurities. The bottom layer is an ion exchange layer, which replaces trace amounts of magnesium, iron, zinc, and other metal ions present in the concentrated sulfuric acid. All three purification layers of the secondary purifier have a flange-insertion detachable structure. After shutdown and venting, the flange bolts can be removed to extract and replace each packing layer. The secondary purifier uses three purification layers to perform multi-stage purification of suspended solids, small particulate impurities, and metal ions, further ensuring the purification effect of concentrated sulfuric acid. The detachable structure of each purification layer allows for individual replacement of each layer, facilitating maintenance.

[0033] The settling tank 1, primary purifier 2, secondary purifier 3, and sulfuric acid transfer pump 5 are each provided in duplicate. To ensure good settling effect of concentrated sulfuric acid, at least two concentrated sulfuric acid inclined settling tanks are generally considered, used alternately to ensure sufficient settling time for concentrated sulfuric acid, which is beneficial for the separation of impurities in concentrated sulfuric acid. One secondary purifier is in operation while the other is on standby, allowing for alternating use. When one unit is under maintenance, the standby unit is activated without affecting the operation of the entire purification system.

[0034] Concentrated sulfuric acid produced by the coking plant's acid production unit is sent to settling tank 1. In the tank, some impurities are separated through settling. These impurities gradually accumulate on the lower side of the sloping settling tank 1 and are then pumped by impurity transfer pump 13 to the intermediate sulfuric acid tank 12. In the intermediate sulfuric acid tank 12, the concentrated sulfuric acid stratifies. The concentrated sulfuric acid at the bottom, containing more impurities, is pumped by acid sludge transfer pump 15 to external production units with lower quality requirements. The relatively pure concentrated sulfuric acid in the middle and upper parts is returned to settling tank 1 by acid sludge transfer pump 15. On the higher side of the bottom of settling tank 1, the concentrated sulfuric acid is purified by primary purifier 2 and then pumped by sulfuric acid transfer pump 5 to secondary purifier 3. In secondary purifier 3, after undergoing three layers of purification—fluorinated vinylidene chloride, activated carbon, and ion exchange—it is then pumped by purified acid transfer pump 7 to the ammonium sulfate unit. When the resistance in secondary purifier 3 is high, the automatic backflushing system operates, and the backflushed concentrated sulfuric acid containing impurities enters the underground sulfuric acid tank 9, which is then pumped back to settling tank 1 by underground sulfuric acid tank pump 10 for further separation. If the resistance of the primary purifier 2 increases, the sulfuric acid transfer pump 5 can be turned on to backwash it, thereby improving the operating effect of the primary purifier 2.

[0035] In the description of this utility model, it should be noted that the terms "left", "right", "up", "down", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0036] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

Claims

1. A defoaming system for mother liquor used in the production of coking ammonium sulfate, characterized in that, It includes a settling tank (1) with a slope at the bottom, a primary purifier (2) and a secondary purifier (3) set at the high point of the slope at the bottom of the settling tank (1). The primary purifier (2) is connected to the secondary purifier (3) through a first pipe (4). A sulfuric acid delivery pump (5) is provided on the first pipe (4). The secondary purifier (3) delivers ammonium sulfate concentrated sulfuric acid through a second pipe (6).

2. The mother liquor defoaming system for coking ammonium sulfate production as described in claim 1, characterized in that, The second pipeline (6) is equipped with a clean acid delivery pump (7).

3. The mother liquor defoaming system for coking ammonium sulfate production as described in claim 1, characterized in that, The lower end of the secondary purifier (3) is provided with a third pipe (8), one end of which is connected to the lower end of the secondary purifier (3), and the other end of which is connected to the upper end of the settling tank (1).

4. The mother liquor defoaming system for coking ammonium sulfate production as described in claim 3, characterized in that, The third pipeline (8) is equipped with a sulfuric acid underground tank (9) and a sulfuric acid underground tank pump (10).

5. The mother liquor defoaming system for coking ammonium sulfate production as described in claim 1, characterized in that, The bottom slope of the settling tank (1) is connected to the sulfuric acid intermediate tank (12) through a fourth pipe (11), and an impurity conveying pump (13) is provided on the fourth pipe (11).

6. The mother liquor defoaming system for coking ammonium sulfate production as described in claim 5, characterized in that, The bottom of the sulfuric acid intermediate tank (12) is a conical tank, and a fifth pipe (14) is provided at the bottom of the sulfuric acid intermediate tank (12). An acid sludge conveying pump (15) is provided on the fifth pipe (14).

7. The mother liquor defoaming system for coking ammonium sulfate production as described in claim 6, characterized in that, The fifth pipe (14) is provided with a first valve (16) at the lower end of the sulfuric acid intermediate tank (12), and also includes a branch pipe (17). The upper end of the branch pipe (17) is connected to the upper end of the sulfuric acid intermediate tank (12), and the lower end of the branch pipe (17) is connected to the fifth pipe (14). The branch pipe (17) is provided with a second valve (18), and the output end of the fifth pipe (14) is connected to the feed pipe of the settling tank (1).

8. The mother liquor defoaming system for coking ammonium sulfate production as described in claim 1, characterized in that, The secondary purifier is mainly divided into three layers for purifying concentrated sulfuric acid. The top layer is a polytetrafluoroethylene filter element layer, the second layer is an activated carbon adsorption layer, and the bottom layer is an ion exchange layer. All three purification layers of the secondary purifier have a flange insertion type detachable structure.

9. The mother liquor defoaming system for coking ammonium sulfate production as described in claim 1, characterized in that, The settling tank (1), the primary purifier (2), the secondary purifier (3), and the sulfuric acid transfer pump (5) are all provided in twos.

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