Online self-cleaning ammonium sulfate concentration device

Abstract

The utility model relates to the technical field of ammonium sulfate concentration in the chemical industry, provides an online self-cleaning ammonium sulfate concentration device, and aims to solve the problems of equipment blockage and cleaning in the ammonium sulfate concentration process in the chemical industry. The device comprises a first-effect evaporator, a second-effect evaporator, a separator, a circulating pump, an ammonium sulfate condensate tank, an ammonium sulfate solution tank, a pump and the like. Water evaporation and polymer stripping are achieved by heating the mixed solution, evaporation condensate produced by the device is used as cleaning fluid, online self-cleaning is achieved, and shutdown cleaning is not needed. The device further comprises auxiliary equipment such as a process condenser and a vacuum injection pump so as to treat the separated steam. And finally, the evaporation residual liquid containing heavy components is conveyed to a downstream sulfuric acid regeneration device for incineration treatment, and waste resource utilization and harmless treatment are achieved. According to the device, the production efficiency is improved, the operation cost is reduced, and the environmental pollution is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of ammonium sulfate concentration in the chemical industry, and in particular to an online self-cleaning ammonium sulfate concentration device. Background Art

[0002] Currently, ammonium sulfate concentration devices use a two-effect evaporation process to heat and concentrate a 15% dilute ammonium sulfate solution into a 39% ammonium sulfate solution. Because the ammonium sulfate solution contains a small amount of catalyst particles and organic substances such as acrylonitrile, hydrocyanic acid, and acetonitrile, polymerization reactions easily occur at high temperatures to form polymers. This leads to frequent blockage of the first- and second-effect evaporator tubes and system pipelines in the ammonium sulfate concentration device, shortening the device's operating cycle and requiring cleaning. Existing ammonium sulfate concentration devices have the following disadvantages:

[0003] First, the existing ammonium sulfate concentration unit must be shut down for high-pressure cleaning whenever it needs cleaning. This downtime not only impacts production schedules but also increases equipment maintenance and labor costs. Furthermore, the high-pressure cleaning process generates hazardous waste, such as wastewater and polymer residue, which is expensive to dispose of, increasing overall operating costs.

[0004] Second, traditional cleaning methods require the introduction of new cleaning fluids or solvents, which increases material costs. Wastewater, polymer residues and other wastes generated during the cleaning process require special treatment, which is difficult and costly to handle.

[0005] Third, traditional high-pressure cleaning methods are time-consuming, typically requiring around 24 hours. This prolonged cleaning process not only impacts production schedules but can also increase equipment wear and energy consumption, making it impossible to quickly respond to market demands or meet urgent production requirements. Utility Model Content

[0006] In order to solve the problems existing in the background technology, the utility model provides an online self-cleaning ammonium sulfate concentration device, which includes:

[0007] Evaporators, including first-effect evaporators and second-effect evaporators, evaporate water and strip polymers by heating the mixed solution;

[0008] The separator, including the first-effect separator and the second-effect separator, flash-evaporates the heated mixed solution to separate water vapor and evaporation residue containing heavy components;

[0009] The first-effect circulation pump and the second-effect circulation pump force the mixed solution to circulate between the evaporator and the separator;

[0010] Ammonium sulfate condensate tank, used to provide evaporation condensate as the main source of cleaning fluid;

[0011] A primary circulation pump, the inlet of which is connected to the outlet of the ammonium sulfate condensate pump;

[0012] The ammonium sulfate condensate pump and the ammonium sulfate condensate tank pump out the 70°C evaporated condensate in the ammonium sulfate condensate tank and mix it with the ammonium sulfate solution as a cleaning liquid to form a mixed solution, which is then transported to the first-effect evaporator;

[0013] Ammonium sulfate solution tank and ammonium sulfate solution pump are used to store and transport the evaporated residual liquid containing heavy components;

[0014] The first-effect evaporator heats the mixed solution, evaporates the water, and strips the polymer; the heated mixed solution enters the first-effect separator for flash evaporation;

[0015] The evaporation residual liquid separated at the bottom of the first-effect separator is transported to the second-effect feed pump through a pipeline, and then sent to the inlet of the second-effect circulation pump by the second-effect feed pump, and enters the second-effect evaporator to continue circulating heating;

[0016] The second-effect evaporator continues to heat the mixed solution at low pressure to evaporate water; the heated mixed solution enters the second-effect separator for flash evaporation;

[0017] The evaporation residual liquid containing heavy components separated at the bottom of the second-effect separator is transported to the ammonium sulfate solution tank through a pipeline. The ammonium sulfate solution tank is connected to the sulfuric acid regeneration device through an ammonium sulfate solution pump, and the evaporation residual liquid is sent to the downstream sulfuric acid regeneration device for incineration.

[0018] In the preferred solution, the outlet of the second-effect separator is connected in sequence to a process condenser, a vacuum jet pump, a vacuum jet pump condenser, and a tail gas scrubber. The steam separated by the second-effect separator is condensed in the process condenser and then enters the vacuum jet pump condenser and the tail gas scrubber for treatment through the vacuum jet pump.

[0019] In a preferred embodiment, a jet mixer is provided in the ammonium sulfate solution tank, and the jet mixer mixes the stripped polymer and the ammonium sulfate solution thoroughly and evenly, thereby ensuring the stability of the flow rate and pressure flowing to the sulfuric acid regeneration device.

[0020] The beneficial effects achieved by the utility model are:

[0021] First, the utility model implements an online self-cleaning function, eliminating the need to shut down for high-pressure cleaning. This avoids production interruptions during cleaning, reduces equipment downtime, ensures continuous and stable operation of the production line, and avoids the wear and tear on equipment caused by traditional high-pressure cleaning, extending the equipment's service life. Regular online self-cleaning effectively prevents blockage of the evaporator tubes and system pipelines, improving system stability and reliability. Furthermore, online self-cleaning reduces the generation of wastewater, polymer residues, and other waste, reducing the risk of environmental pollution.

[0022] Second, the evaporation residue containing heavy components produced by the present invention is sent to a downstream sulfuric acid regeneration unit for incineration, achieving resource utilization and harmless treatment of waste. This avoids the high equipment maintenance and labor costs required by traditional high-pressure cleaning, as well as the costs of hazardous waste treatment such as wastewater and polymer residues.

[0023] Third, the utility model utilizes the evaporation condensate produced by the device as the cleaning liquid, and there is no need to introduce new cleaning liquid or solvent, thereby reducing material costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0025] Numbers in the figure:

[0026] 1. First-effect evaporator; 2. First-effect separator; 3. Second-effect evaporator; 4. Second-effect separator; 5. Process condenser; 6. Vacuum jet pump; 7. Vacuum jet pump condenser; 8. Tail gas scrubber; 9. First-effect circulation pump; 10. Second-effect feed pump; 11. Second-effect circulation pump; 12. Ammonium sulfate condensate pump; 13. Ammonium sulfate condensate tank; 14. Ammonium sulfate solution tank; 15. Ammonium sulfate solution tank jet mixer; 16. Ammonium sulfate solution pump; 17. Sulfuric acid regeneration device. DETAILED DESCRIPTION

[0027] The following will clearly and completely describe the technical solutions of the present invention in conjunction with the drawings in the present invention. In addition, the forms of the various structures recorded in the following embodiments are merely examples. The present invention is not limited to the various structures recorded in the following embodiments. All other implementations obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0028] Reference Figure 1 , an online self-cleaning ammonium sulfate concentration device comprises:

[0029] Evaporator:

[0030] The first-effect evaporator 1 is used to heat the mixed solution for the first time to evaporate the water and strip the polymer.

[0031] The second-effect evaporator 3 receives the evaporation residual liquid from the first-effect evaporator and continues to heat and evaporate water under low pressure.

[0032] separator,

[0033] The first-effect separator 2 flashes the mixed solution heated by the first-effect evaporator to separate water vapor and evaporation residue containing heavy components.

[0034] The second-effect separator 4 flashes the mixed solution heated by the second-effect evaporator to further separate steam and evaporation residue containing heavy components.

[0035] Circulation pump,

[0036] The first effect circulation pump 9 forces the mixed solution to circulate between the first effect evaporator and the first effect separator. Its inlet is connected to the outlet of the ammonium sulfate condensate pump 12 to introduce cleaning solution.

[0037] The second-effect circulating pump 11 forces the mixed solution to circulate between the second-effect evaporator and the second-effect separator. Its inlet receives the evaporated residual liquid from the second-effect feed pump 10.

[0038] The ammonium sulfate condensate tank 13 is used to provide evaporated condensate as the main source of cleaning liquid, and the condensate temperature is 70°C.

[0039] The ammonium sulfate condensate pump 12 pumps out the evaporated condensate in the ammonium sulfate condensate tank 13, mixes it with the ammonium sulfate solution as a cleaning liquid to form a mixed solution, and transports it to the first-effect evaporator 1.

[0040] The ammonium sulfate solution tank 14 is used to store and transport the evaporation residue containing heavy components. It is equipped with a jet mixer 15 to fully mix the stripped polymer with the ammonium sulfate solution, ensuring stable flow and pressure to the sulfuric acid regeneration device 17.

[0041] The ammonium sulfate solution pump 16 is connected to the ammonium sulfate solution tank 14 and the sulfuric acid regeneration device 17 and is used to transport the evaporated residual liquid to the downstream for incineration treatment.

[0042] auxiliary equipment,

[0043] The second-effect feed pump 10 transports the evaporated residual liquid separated at the bottom of the first-effect separator 2 to the inlet of the second-effect circulation pump 11.

[0044] The process condenser 5, vacuum jet pump 6, vacuum jet pump condenser 7, and tail gas scrubber 8 are sequentially connected to the outlet of the secondary effect separator 4 to condense and process the separated steam to ensure environmentally friendly emissions.

[0045] The connection relationship between each structure is as follows:

[0046] The ammonium sulfate condensate tank 13 is connected to the inlet of the first-effect circulation pump 9 through the ammonium sulfate condensate pump 12 to provide cleaning liquid.

[0047] The first-effect circulation pump 9 transports the mixed solution to the first-effect evaporator 1, and the heated mixed solution enters the first-effect separator 2.

[0048] The evaporation residual liquid separated at the bottom of the first-effect separator 2 is transported to the second-effect feed pump 10 through a pipeline, and then transported to the inlet of the second-effect circulation pump 11 by the second-effect feed pump 10.

[0049] The second-effect circulation pump 11 transports the evaporation residual liquid to the second-effect evaporator 3 for further heating, and the heated mixed solution enters the second-effect separator 4.

[0050] The evaporation residue containing heavy components separated at the bottom of the second-effect separator 4 is transported to the ammonium sulfate solution tank 14 through a pipeline.

[0051] The ammonium sulfate solution tank 14 is connected to the sulfuric acid regeneration device 17 through the ammonium sulfate solution pump 16 to send the evaporated residual liquid to the downstream for incineration treatment.

[0052] The outlet of the second-effect separator 4 is connected to the process condenser 5, the vacuum jet pump 6, the vacuum jet pump condenser 7, and the tail gas scrubber 8 in sequence to condense the steam and perform environmental protection treatment.

[0053] The online self-cleaning ammonium sulfate concentration device of the utility model is innovatively designed in the feeding method.

[0054] 1. Feeding and mixing stage:

[0055] While conventional ammonium sulfate concentration devices may use externally introduced raw liquid for concentration, this device cleverly uses the device's own evaporation condensate (temperature 70°C) as the primary source of cleaning fluid, mixing it with the ammonium sulfate solution at the inlet of the primary circulation pump 9. This change not only reduces dependence on external cleaning fluid or solvent, but also fully utilizes the device's internal resources, achieving resource recycling.

[0056] The mixed solution is fed into the first-effect evaporator 1 for heating treatment under the forced circulation of the first-effect circulation pump 9. In this process, the water in the mixed solution begins to evaporate, and the polymer is gradually stripped out under the action of heating, laying the foundation for subsequent separation work.

[0057] 2. First-effect evaporation and separation stage:

[0058] After heating in the first-effect evaporator (1), the mixed solution's temperature and pressure increase, and it then enters the first-effect separator (2) for flash evaporation. During the flash evaporation process, the pressure in the first-effect separator (2) is precisely controlled at approximately 30 kPa, and the flash evaporation temperature is maintained at approximately 105°C. Under these conditions, the water in the mixed solution rapidly turns into water vapor, which separates from the evaporation residue containing heavy components.

[0059] The water vapor, a valuable heat source, is collected and used in the heating process of the second-effect evaporator 3, achieving efficient heat utilization. The evaporation residue containing heavy components is transported to the next treatment stage through a pipeline.

[0060] 3. Second-effect evaporation and re-separation stage:

[0061] The evaporation residue separated at the bottom of the first-effect separator 2 is conveyed by the second-effect feed pump 10 to the inlet of the second-effect circulation pump 11. Under the forced circulation of the second-effect circulation pump 11, the evaporation residue enters the second-effect evaporator 3 for further heating. Compared with the first-effect evaporator, the second-effect evaporator 3 operates at a lower pressure of approximately 30 kPaA, but it can still effectively evaporate water from the mixed solution.

[0062] The heated mixed solution enters the secondary separator 4 for further flash evaporation. At this point, the flash evaporation temperature is approximately 71°C, further separating the steam and the evaporation residue containing the heavy components. The steam can also be collected and used in other processes, while the evaporation residue containing the heavy components becomes the final treatment target.

[0063] 4. Residual liquid treatment and discharge stage:

[0064] The evaporation residue containing heavy components separated from the bottom of the secondary separator 4 is piped to an ammonium sulfate solution tank 14 for storage. When a sufficient amount accumulates, a jet mixer 15 within the ammonium sulfate solution tank 14 begins operating to thoroughly mix the evaporation residue containing heavy components. The evaporation residue is then transported to a downstream sulfuric acid regeneration unit 17 for incineration by an ammonium sulfate solution pump 16. This effectively disposes of the evaporation residue containing heavy components, achieving waste resource utilization and harmless treatment.

[0065] The online self-cleaning ammonium sulfate concentration device provided by the utility model has been innovatively designed in terms of feeding, evaporation, separation and residual liquid treatment, and fully utilizes the evaporation condensate produced by the device as the source of cleaning liquid, thereby realizing the recycling of resources; at the same time, the two-effect evaporation process and flash evaporation technology are adopted to improve the evaporation efficiency of water and the stripping effect of polymers; finally, the harmless discharge of the evaporation residual liquid containing heavy components is achieved through incineration treatment, thereby improving production efficiency, reducing operating costs, and reducing pollution to the environment.

[0066] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An online self-cleaning ammonium sulfate concentration device, characterized in that: It includes: The evaporator includes a first-effect evaporator (1) and a second-effect evaporator (3), which evaporates water and strips the polymer by heating the mixed solution; The separator includes a first-effect separator (2) and a second-effect separator (4) for flash evaporating the heated mixed solution to separate water vapor and evaporation residue containing heavy components; The first-effect circulation pump (9) and the second-effect circulation pump (11) force the mixed solution to circulate between the evaporator and the separator; an ammonium sulfate condensate tank (13) for providing evaporated condensate as a main source of cleaning fluid; A primary circulation pump (9), wherein the inlet of the primary circulation pump (9) is connected to the outlet of the ammonium sulfate condensate pump (12); The ammonium sulfate condensate pump (12) and the ammonium sulfate condensate pump and the ammonium sulfate condensate tank (13) pump out the 70°C evaporated condensate in the ammonium sulfate condensate tank (13), mix it with the ammonium sulfate solution as a cleaning liquid to form a mixed solution, and transport the mixed solution to the first-effect evaporator (1); An ammonium sulfate solution tank (14) and an ammonium sulfate solution pump (16) are used to store and transport the evaporated residual liquid containing the heavy components; The first-effect evaporator (1) heats the mixed solution, evaporates the water, and strips the polymer; the heated mixed solution enters the first-effect separator (2) for flash evaporation; The evaporation residual liquid separated at the bottom of the first-effect separator (2) is transported to the second-effect feed pump (10) through a pipeline, and is then sent to the inlet of the second-effect circulation pump (11) by the second-effect feed pump (10), and enters the second-effect evaporator (3) to continue circulating heating; The second-effect evaporator (3) continues to heat the mixed solution under low pressure to evaporate water; the heated mixed solution enters the second-effect separator (4) for flash evaporation; The evaporation residue containing heavy components separated at the bottom of the second-effect separator (4) is transported to the ammonium sulfate solution tank (14) through a pipeline. The ammonium sulfate solution tank (14) is connected to the sulfuric acid regeneration device (17) through an ammonium sulfate solution pump (16). The evaporation residue is transported to the downstream sulfuric acid regeneration device (17) and then incinerated.

2. The online self-cleaning ammonium sulfate concentration device according to claim 1, characterized in that: The outlet of the second-effect separator (4) is connected in sequence to a process condenser (5), a vacuum jet pump (6), a vacuum jet pump condenser (7), and a tail gas scrubber (8). The steam separated by the second-effect separator (4) is condensed in the process condenser (5) and then enters the vacuum jet pump condenser (7) and the tail gas scrubber (8) for treatment through the vacuum jet pump (6).

3. The online self-cleaning ammonium sulfate concentration device according to claim 1, characterized in that: A jet mixer (15) is provided in the ammonium sulfate solution tank (14) for fully and uniformly mixing the stripped polymer with the ammonium sulfate solution.

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