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CN-119660986-B - Continuous salt separation type high-concentration brine heat exchange process

CN119660986BCN 119660986 BCN119660986 BCN 119660986BCN-119660986-B

Abstract

The invention relates to the technical field of waste liquid treatment and discloses a continuous salt separating type high-concentration brine heat exchange process which comprises the following steps of inputting high-concentration brine into a first evaporation tank through a raw liquid pipeline, concentrating and evaporating the high-concentration brine in the first evaporation tank, inputting the salt separating liquid into a relay tank when a first monitoring component monitors that the monitoring index value of the liquid in the first evaporation tank reaches a first threshold value, inputting the salt separating liquid in the relay tank into a second evaporation tank through a liquid outlet pipeline, and sending the salt separating liquid after heat exchange of a tube heat exchanger into a centrifugal component for salt separation through a salt separating pipeline.

Inventors

  • LU JIANWEI
  • LIU WEI
  • MIAO BINBIN

Assignees

  • 昆山威胜达环保设备有限公司

Dates

Publication Date
20260508
Application Date
20241113

Claims (7)

  1. 1. The continuous salt separation type high-concentration brine heat exchange process is characterized by comprising the following steps of: Step S1, starting a first vacuum assembly (4) to enable the interior of a first evaporation tank (1) and a first refrigerant heat exchanger (3) to be in a negative pressure environment, and simultaneously starting a second vacuum assembly (19) to enable the interior of a second evaporation tank (10), a tubular heat exchanger (13) and a second refrigerant heat exchanger (16) to be in a negative pressure environment, so that the boiling point of liquid in an evaporation treatment system is reduced; s2, inputting high-concentration brine into the first evaporation tank (1) through a raw liquid pipeline (2), inputting a thermal-state refrigerant after absorbing heat of the first compressor (5) into the first evaporation tank (1) so as to concentrate and evaporate the high-concentration brine in the first evaporation tank (1), enabling the thermal-state refrigerant to change into a liquid refrigerant, and monitoring feed liquid in the first evaporation tank (1) by a first monitoring component; s3, inputting a liquid refrigerant into a first refrigerant heat exchanger (3), inputting the liquid refrigerant into a first compressor (5) to do work after heat exchange, and then inputting the liquid refrigerant into a first evaporation tank (1) to perform concentration evaporation; Step S4, when the first monitoring component monitors that the monitoring index value of the feed liquid in the first evaporation tank (1) reaches a first threshold value, the first evaporation tank (1) is internally provided with the salt-separable feed liquid, a feed liquid pipeline (8) is opened at the moment, and the salt-separable feed liquid is input into a relay barrel (9); step S5, a liquid outlet pipeline (11) inputs the separable salt liquid in the relay barrel (9) into a second evaporation tank (10), then the liquid outlet pipeline (11) is closed, and the separable salt liquid circularly flows in a circulating pipeline (12) between the second evaporation tank (10) and a tubular heat exchanger (13); S6, inputting a thermal state refrigerant which absorbs heat of the second compressor (17) into the column tube heat exchanger (13) to exchange heat with the salt-separable liquid entering the column tube heat exchanger (13), and enabling the thermal state refrigerant to be phase-changed into a liquid state refrigerant; s7, starting a salt separation pipeline (15), and conveying salt separation feed liquid subjected to heat exchange of a tube array heat exchanger (13) into a centrifugal component for salt separation, wherein a second monitoring component in a second evaporation tank (10) monitors feed liquid in the second evaporation tank; Step S8, when the second monitoring component monitors that the monitoring index value of the feed liquid in the second evaporation tank (10) reaches a second threshold value, a liquid outlet pipeline (11) is opened, and the same amount of the salt-separable feed liquid as the output quantity of the salt-separating pipeline (15) is input into the second evaporation tank (10); the step S2 specifically includes the following steps: step S21, starting a stock solution pipeline (2), and inputting high-concentration brine into a first evaporation tank (1); s22, after the input of the high-concentration brine is finished, closing a raw liquid pipeline (2), and inputting a thermal state refrigerant which absorbs the heat of the first compressor (5) into the first evaporation tank (1) to concentrate and evaporate the high-concentration brine in the first evaporation tank (1); S23, the hot refrigerant is subjected to phase change to become a liquid refrigerant; step S24, a first monitoring component in the first evaporation tank (1) monitors feed liquid in the first evaporation tank; The step S8 specifically includes the following steps: step S81, when the salt separating pipeline (15) sends the salt separating liquid subjected to heat exchange into the centrifugal component, and when the second detection component monitors that the monitoring index value of the liquid in the second evaporation tank (10) reaches a second threshold value, measuring and calculating the corresponding liquid output quantity when the monitoring index value of the liquid in the second evaporation tank (10) reaches the second threshold value through an external controller; And S82, opening a liquid outlet pipeline (11), inputting the same amount of separable salt liquid as the output amount of the liquid to the second evaporation tank (10), and repeating the steps S5 to S8.
  2. 2. The continuous salt separating type high-concentration brine heat exchange process according to claim 1, wherein in the step S4, after the liquid inlet pipeline (8) is opened to input the salt separating liquid into the relay barrel (9), the raw liquid pipeline (2) is opened to input new high-concentration brine into the first evaporation tank (1).
  3. 3. The continuous salt separating type high concentration brine heat exchange process according to claim 1, wherein the first evaporation tank (1) is connected with the impurity removing separator (7), and the steam generated by the concentration and evaporation of the first evaporation tank (1) is input into the impurity removing separator (7) for impurity removal, and then is input into the first refrigerant heat exchanger (3).
  4. 4. The continuous salt-separating type high-concentration brine heat exchange process according to claim 1, wherein the first evaporation tank (1) is connected with the first refrigerant heat exchanger (3) through the first plate heat exchanger (6), the tubular heat exchanger (13) is connected with the second refrigerant heat exchanger (16) through the second plate heat exchanger (18), and the first plate heat exchanger (6) and the second plate heat exchanger (18) are both connected with the cooling pipeline (20).
  5. 5. The continuous salt-separating high-concentration brine heat exchange process according to claim 1, wherein the first compressor (5) and the second compressor (17) are oil-free compressors.
  6. 6. The continuous salt-separating type high-concentration brine heat exchange process according to claim 1, wherein the first refrigerant heat exchanger (3) and the second refrigerant heat exchanger (16) are immersed heat exchangers, steam pipes for flowing steam are arranged in the first refrigerant heat exchanger (3) and the second refrigerant heat exchanger (16), and the steam pipes are immersed in the refrigerant in the heat exchangers.
  7. 7. The continuous salt-separating type high-concentration brine heat exchange process according to claim 1, wherein a defoaming agent pipeline (21) and a cleaning water pipeline (22) are connected to the second evaporation tank (10), and control valves are respectively arranged on the defoaming agent pipeline (21) and the cleaning water pipeline (22).

Description

Continuous salt separation type high-concentration brine heat exchange process Technical Field The invention relates to the technical field of waste liquid treatment, in particular to a continuous salt-separating type high-concentration brine heat exchange process. Background Distilled water meeting the discharge standard can be extracted from sewage after the heat pump is evaporated and concentrated, the distilled water can be directly discharged, and the remaining concentrate is discharged to a sewage treatment plant for treatment, so that the sewage treatment cost of enterprises can be greatly reduced. The applicant has searched some existing technologies to realize the salt separation treatment of high-concentration brine, for example, patent publication number CN112321048A, its main technical means is that by adopting the process that three-stage countercurrent evaporation of steam and material flow direction are opposite to each other and flash evaporation cooling potassium salt separation is combined, through controlling the concentration and temperature of discharged potassium chloride, thus separating two kinds of salts thoroughly, improving the purity of the separated matter, through applicant's analysis, the disadvantage of this technical scheme is that scaling is necessarily generated when the concentration of the separated salt is reached in the evaporation concentration process, the separated salt is extremely easy to adhere to the side wall of the equipment, can not be smoothly discharged for collection, the separated salt can be deposited at the bottom of the equipment after long service time, resulting in the influence of the efficiency of subsequent evaporation concentration. Disclosure of Invention The invention aims to provide a continuous salt-separating type high-concentration brine heat exchange process aiming at the defects of the prior art, so as to solve the technical problem that scaling of concentrated solution can be generated during salt separation to influence the concentration of subsequent feed liquid. The aim of the invention can be achieved by the following technical scheme: a continuous salt separation type high-concentration brine heat exchange process, which comprises the following steps: Step S1, starting a first vacuum assembly to enable the interior of a first evaporation tank and a first refrigerant heat exchanger to be in a negative pressure environment, and simultaneously starting a second vacuum assembly to enable the interior of a second evaporation tank, a tube array heat exchanger and a second refrigerant heat exchanger to be in a negative pressure environment, so that the boiling point of liquid in an evaporation treatment system is reduced; s2, inputting high-concentration brine into a first evaporation tank through a raw liquid pipeline, inputting a hot refrigerant which absorbs heat of a first compressor into the first evaporation tank at the same time so as to concentrate and evaporate the high-concentration brine in the first evaporation tank, enabling the hot refrigerant to change phase into a liquid refrigerant, and monitoring feed liquid in the first evaporation tank by a first monitoring component in the first evaporation tank; s3, inputting a liquid refrigerant into a first refrigerant heat exchanger, inputting the liquid refrigerant into a first compressor to do work after heat exchange, and then inputting the liquid refrigerant into a first evaporation tank to perform concentration evaporation; S4, when the first monitoring component monitors that the monitoring index value of the feed liquid in the first evaporation tank reaches a first threshold value, the first evaporation tank is internally provided with the salt-separable feed liquid, a feed liquid pipeline is opened at the moment, and the salt-separable feed liquid is input into the relay barrel; S5, a liquid outlet pipeline inputs the salt-separable liquid in the relay barrel into a second evaporation tank, then the liquid outlet pipeline is closed, and the salt-separable liquid circularly flows in a circulating pipeline between the second evaporation tank and the tube array heat exchanger; s6, inputting a thermal state refrigerant which absorbs heat of the second compressor into the column tube heat exchanger to exchange heat with the salt-separable liquid entering the column tube heat exchanger, and enabling the thermal state refrigerant to be phase-changed into a liquid state refrigerant; S7, starting a salt separation pipeline, and conveying salt separation feed liquid subjected to heat exchange of the tubular heat exchanger into a centrifugal component for salt separation, wherein a second monitoring component in a second evaporation tank monitors feed liquid in the second evaporation tank; and S8, when the second monitoring component monitors that the monitoring index value of the feed liquid in the second evaporation tank reaches a second threshold value, starting a liquid outlet pip