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CN-224199167-U - Low-energy-consumption evaporative crystallization system for treating salt-containing wastewater of power plant by utilizing heat pump technology

CN224199167UCN 224199167 UCN224199167 UCN 224199167UCN-224199167-U

Abstract

The utility model relates to the technical field of wastewater treatment, in particular to a low-energy-consumption evaporative crystallization system for treating power plant salt-containing wastewater by utilizing a heat pump technology, which comprises an evaporation tower, a heat exchanger, a condensation tower and a heat pump assembly, wherein the evaporation tower is connected with the heat pump assembly; the heat pump assembly is communicated with the second channel inlet of the heat exchanger, the second channel outlet of the heat exchanger is communicated with the heat pump assembly, the heat pump assembly provides a cold water source for the heat pump assembly, the heat pump assembly supplies generated high-temperature heat source to the heat exchanger, and the water vapor outlet at the top of the evaporation tower is communicated with the inlet at the bottom end of the condensation tower. The utility model adopts the combination of the low-temperature normal-pressure evaporation technology and the heat pump technology, and uses waste heat and waste heat to supplement heat for the low-temperature normal-pressure evaporation technology, thereby completing the low-energy operation of the treatment of the salt-containing wastewater of the power plant.

Inventors

  • WU KUNHAI
  • NIU YAN
  • HU LIPING
  • YANG CHENJIE
  • LIU YUXIN

Assignees

  • 上海航天动力科技工程有限公司

Dates

Publication Date
20260505
Application Date
20241231

Claims (7)

  1. 1. The low-energy-consumption evaporative crystallization system for treating the salt-containing wastewater of the power plant by utilizing the heat pump technology is connected with an external power plant salt-containing wastewater collection tank (2) and is characterized by comprising an evaporation tower (3), a heat exchanger (6), a condensation tower (7) and a heat pump component; The salt-containing wastewater collection tank (2) of the external power plant is connected with the evaporation tower (3), and the evaporation tower (3) is used for evaporating and concentrating wastewater; The liquid outlet at the bottom of the evaporation tower (3) is communicated with the first channel inlet of the heat exchanger (6) and is used for providing a cold water source for the heat exchanger (6); The heat exchanger (6) is used for converting a cold water source into a hot water source; the first channel outlet of the heat exchanger (6) is communicated with the reflux liquid inlet at the top of the evaporator (10) and is used for providing a hot water source for the evaporator (10); The heat pump assembly is communicated with a second channel inlet of the heat exchanger (6), a second channel outlet of the heat exchanger (6) is communicated with the heat pump assembly, the heat exchanger (6) is used for providing a cold water source for the heat pump assembly, and the heat pump assembly is used for receiving a low-temperature heat source of the heat exchanger (6) and converting the low-temperature heat source into a high-temperature heat source so as to supply energy for the heat exchanger (6); the water vapor outlet at the top of the evaporation tower (3) is communicated with the inlet at the bottom end of the condensation tower (7), and the condensation tower (7) is used for condensing the water vapor of the evaporation tower (3) into reusable water; The heat pump assembly is connected with an external cooling circulation tower (13), and the external cooling circulation tower (13) is used for providing an external waste heat source for the heat pump assembly and receiving low-temperature refrigerant of the heat pump assembly; The heat pump assembly comprises an evaporator (10), a compressor (11) and a condenser (12); The first channel outlet of the evaporator (10) is connected with the inlet of the compressor (11), the outlet of the compressor (11) is connected with the first channel inlet of the condenser (12), and the first channel outlet of the condenser (12) is connected with the first channel inlet of the evaporator (10) and the liquid inlet of the external cooling circulation tower (13); The second channel outlet of the heat exchanger (6) is connected with the first channel inlet of the evaporator (10), and the gas outlet of the condenser (12) is connected with the second channel inlet of the heat exchanger (6); the gas outlet of the external cooling circulation tower (13) is connected with the gas inlet of the evaporator (10); The evaporator (10) adopts a low-temperature positive pressure evaporation technology, and the evaporator (10) is used for receiving a cold water source of the heat exchanger (6) and a waste heat source of the external cooling circulation tower (13), and absorbing the waste heat source to convert the cold water source into low-temperature low-pressure gas; The compressor (11) is used for converting low-temperature low-pressure gas into high-temperature high-pressure gas; The condenser (12) is used for converting high-temperature high-pressure gas into low-temperature refrigerant and releasing a high-temperature heat source, and the condenser (12) is connected with the heat exchanger (6) and is used for providing the high-temperature heat source for the heat exchanger (6) and providing the low-temperature refrigerant for the evaporator (10) and the external cooling circulation tower (13); The evaporation tower (3) is communicated with the air blower (1) through the gas conveying pipeline, and the air blower (1) is used for providing stable air flow for the evaporation tower (3) so as to improve the evaporation efficiency of the evaporation tower (3).
  2. 2. The low-energy-consumption evaporative crystallization system for treating power plant brine wastewater by utilizing heat pump technology according to claim 1, wherein a bottom liquid outlet of the condensing tower (7) is communicated with a top reflux liquid inlet of the condensing tower (7) or an external reclaimed water recycling system.
  3. 3. The low-energy-consumption evaporative crystallization system for treating power plant brine wastewater by utilizing heat pump technology according to claim 1, wherein a bottom liquid outlet of the condensing tower (7) is communicated with an external reclaimed water recycling system.
  4. 4. The low-energy-consumption evaporative crystallization system for treating power plant brine wastewater by utilizing heat pump technology according to claim 1, wherein a condensing circulating water pump (8) is arranged at a bottom liquid outlet of the condensing tower (7).
  5. 5. The low-energy-consumption evaporative crystallization system for treating power plant brine wastewater by utilizing heat pump technology according to claim 1, wherein a forced circulating water pump (4) and a waste residue discharge valve (5) are arranged at a bottom liquid outlet of the evaporation tower (3).
  6. 6. A low energy consumption evaporative crystallization system for treating power plant brine waste by heat pump technology according to claim 1, characterized in that the system is provided with a blower (1), the blower (1) being connected with an evaporation tower (3).
  7. 7. The low-energy-consumption evaporative crystallization system for treating power plant brine wastewater by utilizing heat pump technology according to claim 1, wherein a liquid inlet pump (15) is arranged at the bottom liquid inlet of the evaporation tower (3).

Description

Low-energy-consumption evaporative crystallization system for treating salt-containing wastewater of power plant by utilizing heat pump technology Technical Field The utility model relates to the technical field of wastewater treatment, in particular to a low-energy-consumption evaporative crystallization system for treating power plant salt-containing wastewater by utilizing a heat pump technology. Background At present, most of landfill leachate adopts a membrane recovery technology, membrane concentrate (salt, heavy metal and refractory organic matters) is recharged to a landfill, the quality of the landfill leachate is rapidly deteriorated as time is accumulated, the treatment difficulty of the existing technology is not enough, and the existing technology is stopped. The waste incineration power plant and the coal-fired thermal power plant contain a large amount of waste heat water (turbine cooling water, generator cooling water, transformer cooling water and the like) which needs to be cooled and high-temperature flue gas which is discharged, and various membrane process water-making concentrated water containing brine needs to be treated. The existing evaporation process has large demand on high-grade heat sources (industrial electricity and steam generation), does not utilize low-grade heat sources and does not explore other purposes, so that the low-grade heat sources are wasted and cannot generate any value, and the low-grade heat sources also need to spend resources for collection and cooling to meet the production process demand. Therefore, how to utilize the above waste heat sources to optimize the power plant brine wastewater treatment process is of great importance. Disclosure of utility model In order to solve the problems, the utility model aims to provide a low-energy-consumption evaporative crystallization system for treating salt-containing wastewater of a power plant by utilizing a heat pump technology. The low-temperature evaporation technology of the evaporation tower is characterized in that the saturated vapor pressure of the vapor is increased along with the temperature increase by utilizing the difference of air temperature to influence the difference of the capability of carrying moisture (the saturated vapor pressure of the vapor is increased along with the temperature increase) under the normal pressure state, and the content of the vapor in the air is very low under the room temperature condition, but the content of the vapor in the air can be close to 75% -90% when the vapor is close to the boiling point of the water (80 ℃) and above. And after the temperature is raised, the power plant saline wastewater transfers the steam (moisture-containing air) in the evaporation tower to the condensation tower through wind, and the steam is condensed and latent heat is released. The light components in the evaporation tower are continuously reduced, the heavy components (salt, organic matters, heavy metals and the like) are continuously accumulated to form concentrated mother liquor, and finally the concentrated mother liquor is burned or crystallized; sensible heat in the condensing tower is utilized and is recycled after being cooled by a cold source (cooling water and chilled water) or reaches standard discharge. The aim of the utility model can be achieved by the following technical scheme: The utility model provides a low-energy-consumption evaporative crystallization system for treating power plant salt-containing wastewater by utilizing a heat pump technology, which is connected with an external power plant salt-containing wastewater collection tank and comprises an evaporation tower, a heat exchanger, a condensation tower and a heat pump component; The salt-containing wastewater collection tank of the external power plant is connected with an evaporation tower, and the evaporation tower is used for evaporating and concentrating wastewater, so that the wastewater recycling rate is improved, and the wastewater tail end disposal rate is reduced; the liquid outlet at the bottom of the evaporation tower is communicated with the first channel inlet of the heat exchanger and is used for providing a cold water source for the heat exchanger; The heat exchanger is used for converting a cold water source into a hot water source; The first channel outlet of the heat exchanger is communicated with the reflux liquid inlet at the top of the evaporator and is used for providing a hot water source for the evaporator; The heat pump assembly is communicated with a second channel inlet of the heat exchanger, a second channel outlet of the heat exchanger is communicated with the heat pump assembly, the heat exchanger is used for providing a cold water source for the heat pump assembly, and the heat pump assembly is used for receiving a low-temperature heat source of the heat exchanger and converting the low-temperature heat source into a high-temperature heat source so as to supply energy for the he