Solid salt pretreatment device
By designing a solid salt pretreatment device including a pressurized pump and a multi-stage screen plate, the problem of plate bonding and adhesion of solid salt during storage and dissolution is solved, and efficient solid salt dissolution and mechanical impurity removal is achieved, which improves the Equipment reliability and ease of operation.
Patent Information
- Application Number
- CN202420420360.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-05
- Publication Date
- 2025-02-11
- Estimated Expiration
- 2034-03-05
AI Technical Summary
The existing solid salt pretreatment devices are prone to plate bonding and adhesion problems during storage and dissolution, and mechanical stirring equipment is easily damaged due to the large volume of solid salt, and the equipment is low reliability.
A solid salt pretreatment device including a pressurized pump, a multi-stage screen plate and a settlement tank was designed. The filtrate in the settlement tank was refluxed to the dissolution tank through a pressurized pump, and hydraulic stirring was carried out to avoid damage to mechanical stirring. The mechanical impurities and sulfur particles are removed by multi-stage screening.
The device can effectively remove mechanical impurities and sulfur particles from solid salts, improve the dissolution efficiency of solid salts, avoid equipment blockage, enhance equipment reliability, and simplify transportation and installation.
Smart Images
Figure CN222445695U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of hazardous waste resource treatment, and specifically relates to a solid salt pretreatment device, and more specifically to a coke oven gas desulfurization by-product solid salt pretreatment device. Background Art
[0002] In recent years, domestic coking plants have widely adopted the HPF desulfurization process using binuclear phthalocyanine cobalt ammonium sulfonate (PDS) as a catalyst and ammonia as an alkali source. During the desulfurization process, ammonium thiosulfate, ammonium thiocyanate, ammonium sulfate and other salt substances are continuously generated in the desulfurization liquid. When the salt content in the desulfurization liquid increases, the desulfurization efficiency will be significantly reduced. To maintain the desulfurization efficiency, it is necessary to control the salt content in the desulfurization liquid. On the one hand, a part of ammonia water should be added to the desulfurization tower, and at the same time, a certain amount of desulfurization clear liquid should be discharged. The desulfurization liquid contains a large amount of salt and metal ions. Direct discharge not only pollutes the environment, but also does not recycle the ammonium salt, resulting in a waste of resources.
[0003] From the perspective of industrial production, most domestic coking plants currently use evaporation and concentration technology to treat desulfurization waste liquid. The concentration of desulfurization waste liquid is increased by negative pressure double-effect evaporation, and the salt in the waste liquid is crystallized after cooling. Then, the concentrated salt is sliced and bagged by a flake machine. The process is simple, converting the desulfurization waste liquid from liquid to solid, which is easy to store, achieving the reduction of desulfurization waste liquid, alleviating the pressure of desulfurization production, and facilitating its resource utilization.
[0004] However, during the long-term storage of solid salt, the solid salt will absorb water and harden, and at the same time stick to the woven bags containing the materials. The existing solid salt pretreatment device mainly uses a reactor with an agitator. The feed inlet of the reactor is small, and the hardened salt cannot be directly fed and dissolved, and needs to be broken in advance. After entering the reactor, the aged woven bags will be entangled on the stirring paddle and block the discharge pipe. Therefore, it is necessary to develop a solid salt pretreatment device with strong adaptability and simple structure. Utility Model Content
[0005] The utility model aims to overcome the problems in the prior art that solid salt is easy to harden and stick during storage, and impurities affect the use during dissolution pretreatment.
[0006] To this end, the utility model provides a solid salt pretreatment device, including a pressure pump and a dissolution tank and a sedimentation tank separated by a primary sieve plate; the dissolution tank is provided with a reflux liquid inlet; the sedimentation tank is provided with a reflux liquid outlet; the inlet of the pressure pump is connected to the reflux liquid outlet; the outlet of the pressure pump is connected to the reflux liquid inlet.
[0007] Specifically, a sieve plate mounting slide rail is provided on the inner side wall of the connecting end of the dissolving tank and the sedimentation tank; the primary sieve plate is detachably mounted between the dissolving tank and the sedimentation tank via the sieve plate mounting slide rail.
[0008] Specifically, a sealing strip is provided at the connection between the first-level sieve plate and the sieve plate mounting slide rail.
[0009] Specifically, the above-mentioned first-level screen plate is arranged inclined.
[0010] Specifically, a secondary sieve plate is provided in the sedimentation tank, and the pores of the secondary sieve plate are smaller than those of the primary sieve plate.
[0011] Specifically, the reflux liquid outlet is arranged between the primary sieve plate and the secondary sieve plate.
[0012] Specifically, the solid salt pretreatment device further includes a buffer tank; the sedimentation tank and the buffer tank are separated by an overflow plate, and the height of the overflow plate is lower than the height of the outer wall of the sedimentation tank.
[0013] Specifically, the solid salt pretreatment device further comprises a salt slurry delivery pump; the buffer tank is provided with a salt slurry delivery port; the salt slurry delivery pump is connected to the salt slurry delivery port through a pipeline.
[0014] Specifically, a sieve plate flushing pipe is provided in the dissolving tank; the sieve plate flushing pipe is connected to the outlet of the salt slurry delivery pump.
[0015] Specifically, the sedimentation tank is provided with a sewage valve.
[0016] Compared with the prior art, the utility model has the following advantages and beneficial effects:
[0017] The solid salt pretreatment device provided by the utility model uses a pressure pump to extract the filtrate in the sedimentation tank and pressurize it before returning it to the dissolution tank, and hydraulically stirs the liquid in the dissolution tank. Compared with mechanical stirring, there is no need to worry about the problem of damaging the blades due to the large volume of solid salt that has not been crushed, and the equipment has strong reliability. By designing a multi-stage sieve plate and a sedimentation tank, the influence of mechanical impurities and sulfur particles on subsequent work sections can be effectively removed; the flushing pipe is designed on the surface of the sieve plate to achieve self-cleaning of the sieve plate and avoid impurities blocking the sieve holes. At the same time, it can also strengthen stirring and accelerate the dissolution of solid salt. The entire device can be designed with a skid-mounted structure, and the dissolution tank, sedimentation tank, and buffer tank are connected in series to form a whole. It is simple to transport and install, occupies a small area, and has low difficulty in operation.
[0018] The present invention will be described in further detail below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 This is a system diagram of a solid salt pretreatment device provided by the utility model.
[0020] Figure 2 It is a front view of the solid salt pretreatment device provided by the utility model.
[0021] Figure 3 It is a top view of the solid salt pretreatment device provided by the utility model.
[0022] Figure 4 It is a side view of the solid salt pretreatment device provided by the utility model.
[0023] Explanation of the reference numerals: 1. dissolution tank; 101. reflux liquid inlet; 102. flushing liquid inlet; 2. primary sieve plate; 3. sedimentation tank; 301. reflux liquid outlet; 302. drain valve; 4. secondary sieve plate; 5. overflow plate; 6. buffer tank; 601. salt slurry delivery port; 7. pressure pump; 8. salt slurry delivery pump; 9. reinforcement ribs. DETAILED DESCRIPTION
[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0025] In the description of the present invention, it should be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present invention. In the description of the present invention, unless otherwise specified, "multiple" means two or more.
[0026] Reference Figure 1-4 The utility model provides a solid salt pretreatment device, including a pressure pump 7 and a dissolution tank 1 and a sedimentation tank 3 separated by a primary sieve plate 2; the dissolution tank 1 is provided with a reflux liquid inlet 101; the sedimentation tank 3 is provided with a reflux liquid outlet 301; the inlet of the pressure pump 7 is connected to the reflux liquid outlet 301; the outlet of the pressure pump 7 is connected to the reflux liquid inlet 101.
[0027] The solid salt treated by the utility model is mainly solid salt after the HPF desulfurization liquid of coke oven gas is concentrated, crystallized, sliced and bagged. Its main components are ammonium thiocyanate, ammonium thiosulfate, ammonium sulfate, sulfur and metal ions such as iron, nickel and chromium, which belong to hazardous solid waste. When in use, the solid salt is put into the dissolution tank 1. Since the solid salt is mainly ammonium salt, a large amount of heat is absorbed during the dissolution process, so steam condensed water or hot water from other sources can be used to accelerate the dissolution. The salt slurry formed after the solid salt is dissolved is filtered through the primary sieve plate 2 and enters the sedimentation tank 3. The dissolved salt slurry is extracted from the sedimentation tank 3 through the reflux liquid outlet 301 through an external stirring pump, that is, a pressure pump 7, and pumped into the dissolution tank 1 from the reflux liquid inlet 101 after pressurization, and the liquid in the dissolution tank 1 is hydraulically stirred to accelerate the dissolution of the solid salt. The sieve plate is mainly used to filter and remove large particles of mechanical impurities, and the sedimentation tank 3 mainly removes impurities and sulfur in the salt slurry through free sedimentation.
[0028] Specifically, a sieve plate mounting slide rail is provided on the inner side wall of the connection end between the dissolving tank 1 and the settling tank 3; the primary sieve plate 2 is detachably mounted between the dissolving tank 1 and the settling tank 3 through the sieve plate mounting slide rail. After long-term use, the sieve plate can be replaced through the slide rail.
[0029] In order to prevent impurities in the dissolving tank 1 from entering the sedimentation tank 3 through the connection gap between the primary sieve plate 2 and the sieve plate mounting rail, a sealing strip is provided at the connection between the primary sieve plate 2 and the sieve plate mounting rail for sealing, preferably a rubber sealing strip.
[0030] Furthermore, the first-stage sieve plate 2 is arranged at an angle, which can increase the filtering area on the one hand and facilitate cleaning of impurities on the surface of the sieve plate on the other hand.
[0031] In order to improve the filtering effect, a secondary sieve plate 4 is provided in the sedimentation tank 3 along the water flow direction to further filter the filtrate. The number of the secondary sieve plates 4 can be designed according to the volume of the sedimentation tank 3 and the filtering effect. Generally, two layers of sieve plates are installed in the device to meet the demand. The secondary sieve plate 4 is preferably inclined at the same angle as the primary sieve plate 2, and the pores of the sieve plate are gradually reduced according to the water flow direction to improve the filtering accuracy.
[0032] Specifically, the reflux liquid outlet 301 is arranged between the primary sieve plate 2 and the secondary sieve plate 4. The height of the reflux liquid outlet 301 from the bottom of the sedimentation tank 3 is generally not less than 400 mm. The salt slurry is extracted from the sedimentation tank 3 and returned to the dissolution tank 1 for hydraulic stirring, which can avoid the blockage of the pump due to mechanical impurities.
[0033] In an optimized embodiment, the solid salt pretreatment device further includes a buffer tank 6; the sedimentation tank 3 and the buffer tank 6 are separated by an overflow plate 5, and the height of the overflow plate 5 is lower than the height of the outer wall of the sedimentation tank 3. The upper clear liquid in the sedimentation tank 3 flows into the buffer tank 6 through the overflow plate 5. The buffer tank 6 is used to collect the salt slurry after dissolution, filtration and sedimentation.
[0034] Furthermore, the solid salt pretreatment device also includes a salt slurry delivery pump 8; a salt slurry delivery port 601 is provided on the buffer tank 6; the salt slurry delivery pump 8 is connected to the salt slurry delivery port 601 through a pipeline, and the salt slurry delivery pump 8 extracts salt slurry from the buffer tank 6 and pumps it to the subsequent process section. The buffer tank 6 can provide a certain buffering capacity for the salt slurry delivery pump 8 to prevent the salt slurry delivery pump 8 from being sucked empty. The salt slurry delivery port 601 is preferably arranged on the side wall of the buffer tank 6, and the height from the bottom of the buffer tank 6 is greater than 400 mm.
[0035] Furthermore, a hydrometer is installed on the side of the buffer tank 6. By controlling the specific gravity of the salt slurry, the reflux ratio of the outlet of the salt slurry delivery pump 8 can achieve continuous feeding and continuous discharging.
[0036] Optionally, a sieve plate flushing pipe is provided in the dissolving tank 1; the sieve plate flushing pipe is connected to the outlet of the salt slurry delivery pump 8. By providing a sieve plate flushing bypass connected to the sieve plate flushing pipe on the outlet pipe of the delivery pump, the treated salt slurry is used to continuously flush the sieve plate surface to prevent mechanical impurities from clogging the sieve plate.
[0037] Furthermore, a drain valve 302 is provided on the settling tank 3, preferably at the bottom or side of the settling tank 3 near the bottom of the tank. The freely settled sludge is discharged regularly through the drain valve 302 at the bottom of the settling tank 3.
[0038] Embodiment 1:
[0039] This embodiment provides a solid salt pretreatment device, including a box body, a primary sieve plate 2, a secondary sieve plate 4, a pressure pump 7 and a salt slurry delivery pump 8.
[0040] The box body is a rectangular box body with no cover on the top formed by welding steel plates, and reinforcement ribs 9 and related flange interfaces are welded at equal intervals outside the box body. Two sieve plate mounting rails inclined to the bottom of the box are respectively provided on the inner walls on both sides of the length direction of the box body. The sieve plate mounting rails on the inner walls on both sides correspond to each other, and the four sieve plate mounting rails are parallel. The primary sieve plate 2 and the secondary sieve plate 4 are respectively inserted into the box body through the corresponding sieve plate mounting rails. The inclination angles of the two layers of sieve plates are consistent, and the gap of the secondary sieve plate 4 is smaller than that of the primary sieve plate 2. The connection between the sieve plate and the sieve plate mounting rail is sealed by a rubber sealing strip. A steel plate is welded in the box body of the secondary sieve plate 4 away from the side of the primary sieve plate 2 for partitioning. The steel plate and the tank body are fully welded, and the height of the steel plate is lower than the height of the side wall of the box body, which is used as an overflow plate 5. The primary sieve plate 2 and the overflow plate 5 divide the box body into a dissolving tank 1, a sedimentation tank 3 and a buffer tank 6, and the secondary sieve plate 4 is located in the sedimentation tank 3.
[0041] A reflux liquid inlet 101 is provided on the side wall of the dissolution tank 1 , a reflux liquid outlet 301 is provided on the side wall of the sedimentation tank 3 between the primary sieve plate 2 and the secondary sieve plate 4 , the inlet of the booster pump 7 is connected to the reflux liquid outlet 301 , and the outlet is connected to the reflux liquid inlet 101 .
[0042] The side wall of the dissolving tank 1 is provided with a flushing liquid inlet 102, and a sieve plate flushing pipe is provided inside. A sewage valve 302 is provided near the bottom of the side of the sedimentation tank 3. A specific gravity meter is installed on the side of the buffer tank 6.
[0043] A salt slurry delivery port 601 is provided on the side wall of the buffer tank 6, and the slurry delivery pump is connected to the salt slurry delivery port 601 through a pipeline. The outlet of the salt slurry delivery pump 8 is provided with two pipelines, one pipeline is connected to the next section, and the other pipeline is connected to the screen plate flushing pipe through the flushing liquid inlet 102, and both pipelines are provided with regulating valves.
[0044] The reflux liquid inlet 101, reflux liquid outlet 301, flushing port, drain valve 302, and salt slurry delivery port 601 are located on the same side of the box. The reflux liquid inlet 101, reflux liquid outlet 301, the suction port of the dissolving stirring pump and the salt slurry delivery pump 8 are all provided with valves for easy maintenance of the pump body.
[0045] The solid salt pretreatment device is a skid-mounted device, with the dissolving tank 1, filtering and settling tank 3, and buffer tank 6 connected in series as an integral device. Since the solid salt is highly corrosive after dissolving, the dissolving tank 1, settling tank 3, buffer tank 6 and related pipelines and valves that are in long-term contact with the salt slurry are made of materials not less than 316L, and the pressure pump 7 and the salt slurry delivery pump 8 are chemical plastic pumps.
[0046] During use, the hardened solid salt is put into the dissolving tank 1, and steam condensed water or hot water from other sources is added to the dissolving tank 1 to dissolve the solid salt. The solution enters the settling tank 3 through the primary sieve plate 2, and is filtered twice in the settling tank 3 through the secondary sieve plate 4. Large particles of mechanical impurities can be removed by filtering through the two-stage sieve plate, but the thiosulfate in the salt slurry will be oxidized during the dissolution and stirring process, and fine sulfur particles will be generated at the same time. In the process of salt slurry transportation, sulfur particles are easily heated and grown to block the pipeline, and the specific gravity of sulfur is greater than that of salt slurry, so sulfur can be collected in the settling tank 3 by free sedimentation, and the upper clarified salt slurry enters the buffer tank 6 by overflow, and when sulfur accumulates to a certain extent, sulfur is discharged from the drain valve 302 at the bottom of the settling tank 3.
[0047] The pressure pump 7 extracts the dissolved salt slurry from the sedimentation tank 3 through the reflux liquid outlet 301, and pumps it into the dissolution tank 1 from the reflux liquid inlet 101 after pressurization, so as to hydraulically stir the liquid in the dissolution tank 1 and accelerate the dissolution of the solid salt.
[0048] The salt slurry delivery pump 8 extracts the salt slurry from the buffer tank 6 and pumps it to the subsequent process section, or delivers the treated salt slurry to the screen plate flushing pipe as needed to continuously flush the screen plate surface. The reflux ratio at the outlet of the salt slurry delivery pump 8 is controlled by the specific gravity of the salt slurry detected by the hydrometer to achieve continuous feeding and continuous discharging.
[0049] The above examples are merely illustrative of the present invention and do not constitute a limitation on the protection scope of the present invention. All designs that are identical or similar to the present invention fall within the protection scope of the present invention.
Claims
1. A solid salt pretreatment device, characterized in that: The invention comprises a pressure pump (7) and a dissolving tank (1) and a settling tank (3) separated by a primary sieve plate (2); the dissolving tank (1) is provided with a reflux liquid inlet (101); the settling tank (3) is provided with a reflux liquid outlet (301); the inlet of the pressure pump (7) is connected to the reflux liquid outlet (301); and the outlet of the pressure pump (7) is connected to the reflux liquid inlet (101).
2. The solid salt pretreatment device according to claim 1, characterized in that: A sieve plate mounting slide rail is provided on the inner side wall of the connection end between the dissolving tank (1) and the sedimentation tank (3); the primary sieve plate (2) is detachably mounted between the dissolving tank (1) and the sedimentation tank (3) via the sieve plate mounting slide rail.
3. The solid salt pretreatment device according to claim 2, characterized in that: A sealing strip is provided at the connection between the primary sieve plate (2) and the sieve plate mounting slide rail.
4. The solid salt pretreatment device according to claim 1, characterized in that: The primary sieve plate (2) is arranged obliquely.
5. The solid salt pretreatment device according to claim 1, characterized in that: A secondary sieve plate (4) is provided in the sedimentation tank (3), and the pores of the secondary sieve plate (4) are smaller than those of the primary sieve plate (2).
6. The solid salt pretreatment device according to claim 5, characterized in that: The reflux liquid outlet (301) is arranged between the primary sieve plate (2) and the secondary sieve plate (4).
7. The solid salt pretreatment device according to claim 1, characterized in that: It also comprises a buffer tank (6); the sedimentation tank (3) and the buffer tank (6) are separated by an overflow plate (5), and the height of the overflow plate (5) is lower than the height of the outer wall of the sedimentation tank (3).
8. The solid salt pretreatment device according to claim 7, characterized in that: It also includes a salt slurry delivery pump (8); a salt slurry delivery port (601) is provided on the buffer tank (6); the salt slurry delivery pump (8) is connected to the salt slurry delivery port (601) through a pipeline.
9. The solid salt pretreatment device according to claim 8, characterized in that: A sieve plate flushing pipe is provided in the dissolving tank (1); the sieve plate flushing pipe is connected to the outlet of the salt slurry delivery pump (8).
10. The solid salt pretreatment device according to claim 1, characterized in that: The sedimentation tank (3) is provided with a sewage discharge valve (302).