CN214004100U - Contain salt effluent treatment plant - Google Patents
Contain salt effluent treatment plant Download PDFInfo
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- CN214004100U CN214004100U CN202021866288.8U CN202021866288U CN214004100U CN 214004100 U CN214004100 U CN 214004100U CN 202021866288 U CN202021866288 U CN 202021866288U CN 214004100 U CN214004100 U CN 214004100U
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/72—Organic compounds not provided for in groups B01D53/48 - B01D53/70, e.g. hydrocarbons
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
Abstract
The utility model relates to a contain salt effluent treatment plant, include: the system comprises a heat exchanger, an exhaust condenser, a crystallization separator, a gas washing tower, a steam compressor, a forced circulation pump and a heater; the first liquid outlet of the heat exchanger is connected with the liquid inlet of the exhaust condenser, the first liquid outlet of the exhaust condenser is connected with the liquid inlet of the crystallization separator, the gas outlet of the crystallization separator is connected with the gas inlet of the gas washing tower, the gas outlet of the gas washing tower is connected with the gas inlet of the steam compressor, the gas outlet of the steam compressor is connected with the gas inlet of the heater, and the liquid outlet of the gas washing tower is connected with the liquid inlet of the crystallization separator; the liquid outlet of the crystallization separator is connected with the liquid inlet of the forced circulation pump, the liquid outlet of the forced circulation pump is connected with the liquid inlet of the heater, and the first liquid outlet of the heater is connected with the liquid inlet of the crystallization separator. The salt-containing wastewater treatment device is high in efficiency, energy-saving and capable of realizing zero discharge of wastewater.
Description
Technical Field
The utility model relates to a mechanical equipment technical field especially relates to a contain salt effluent disposal system.
Background
A large amount of waste liquid and waste gas generated in life and various industrial production processes needs to be effectively destroyed by a thermal oxidizer before being discharged into the environment, so that the discharge of pollutants in the waste liquid and the waste gas is greatly reduced. In order to destroy harmful components in the waste liquid and waste gas pollutants, the thermal oxidizer adopts a thermal oxidation process, in the thermal oxidation process, the waste liquid and waste gas pollutants and oxygen are subjected to oxidation reaction under certain temperature conditions, and the waste liquid and waste gas pollutants are converted into harmless substances such as carbon dioxide and water vapor through the chemical reaction and can be safely discharged. During the oxidation reaction, solid products are generated and remain in the thermal oxidizer, and the thermal oxidizer needs to be cleaned by chemical reagent liquid, so that a large amount of washing wastewater is generated.
The washing wastewater of the thermal oxidizer contains more sodium salt, organic substances and other reducing substances, and the Chemical Oxygen Demand (COD) of the wastewater is high and far higher than the wastewater discharge standard regulated by the state.
In the conventional process, the washing wastewater of the thermal oxidizer is usually mixed with other industrial wastewater, and pollutants in the wastewater are removed by membrane permeation treatment, microbial decomposition, electrochemical methods and other methods, wherein secondary pollution is easily caused by slight improper treatment, additional wastewater is generated, the environment is damaged, and the purification efficiency is low.
Accordingly, the prior art is yet to be improved and developed.
SUMMERY OF THE UTILITY MODEL
In view of the above, it is necessary to provide an apparatus for treating salt-containing wastewater which is efficient and energy-saving and has zero discharge of wastewater.
The utility model provides a contain salt effluent treatment plant, include: the system comprises a heat exchanger, an exhaust condenser, a crystallization separator, a gas washing tower, a steam compressor, a heater and a forced circulation pump; a first liquid outlet of the heat exchanger is connected with a liquid inlet of the exhaust condenser, a first liquid outlet of the exhaust condenser is connected with a liquid inlet of the crystallization separator, a gas outlet of the crystallization separator is connected with a gas inlet of the gas washing tower, a gas outlet of the gas washing tower is connected with a gas inlet of the vapor compressor, a gas outlet of the vapor compressor is connected with a gas inlet of the heater, and a liquid outlet of the gas washing tower is connected with a liquid inlet of the crystallization separator;
the liquid outlet of the crystallization separator is connected with the liquid inlet of the forced circulation pump, and the liquid outlet of the forced circulation pump is connected with the liquid inlet of the heater; and a first liquid outlet of the heater is connected with a liquid inlet of the crystallization separator.
In some of these embodiments, the outlet of the heater is connected to the inlet of the exhaust condenser.
In some embodiments, the salt-containing wastewater treatment device further comprises a first delivery pump, and the first delivery pump is positioned on a pipeline connected between the liquid outlet of the gas washing tower and the liquid inlet of the crystallization separator.
In some embodiments, the salt-containing wastewater treatment device further comprises a liquid washing tank, and a liquid outlet of the liquid washing tank is connected with a liquid inlet of the gas washing tower.
In some embodiments, the saline wastewater treatment device further comprises a concentrate pump, a thickener, a solid-liquid separator, a mother liquor tank and a mother liquor pump;
the liquid outlet of the crystallization separator is connected with the liquid inlet of the thickener, the first liquid outlet of the thickener is connected with the liquid inlet of the solid-liquid separator, the liquid outlet of the solid-liquid separator is connected with the liquid outlet of the mother liquid tank, and the liquid outlet of the mother liquid tank is connected with the liquid inlet of the crystallization separator;
the concentrated liquid pump is arranged on a connecting pipeline between the liquid outlet of the crystallization separator and the liquid inlet of the thickener; the mother liquor pump is arranged on a connecting pipeline between a liquid outlet of the mother liquor tank and a liquid inlet of the crystallization separator.
In some embodiments, the second liquid outlet of the thickener is connected with the liquid inlet of the crystallization separator.
In some of the embodiments, the salt-containing wastewater treatment device further comprises a mother liquor tank, a second delivery pump, a spray drying tower and a fan; a liquid inlet of the mother liquid tank is connected with a liquid outlet of the mother liquid pump, a liquid outlet of the mother liquid tank is connected with a liquid inlet of the spray drying tower, and a liquid outlet of the spray dryer is connected with a liquid inlet of the fan; and the second delivery pump is positioned on a connecting pipeline between the liquid outlet of the mother liquid tank and the liquid inlet of the spray drying tower.
In some of these embodiments, the salt-containing wastewater treatment plant further comprises a distilled water tank; and a second liquid outlet of the heater is connected with a liquid inlet of the distilled water tank, and a liquid outlet of the distilled water tank is connected with a first liquid inlet of the heat exchanger.
In some of these embodiments, the crystallization separator saturated vapor inlet is connected to the outlet of the distillation water tank.
In some embodiments, the salt-containing wastewater treatment device further comprises a chemical agent tank, and a liquid outlet of the chemical agent tank is connected with a liquid inlet of the crystallization separator.
Advantageous effects
The salt-containing wastewater treatment device of the utility model can be used for treating the salt-containing wastewater to be treated; when the device works, the salt-containing wastewater to be treated is preheated in the heat exchanger, the preheated salt-containing wastewater enters the exhaust condenser, steam carried by the preheated salt-containing wastewater is condensed in the exhaust condenser, the heat generated by condensation further raises the temperature of the salt-containing wastewater, condensed water is recovered, and the heat efficiency is improved; the waste liquid after temperature raising enters a crystallization separator to be subjected to flash evaporation, salt-containing waste water is concentrated and steam is released, the steam is subjected to gas washing through a gas washing tower, and low-boiling-point fatty acid or other organic substances carried in the steam are removed, so that the VOC (volatile organic compounds) of the steam is reduced; the steam after the gas washing is pumped out by a steam compressor to raise the temperature and the pressure, and the steam after the temperature raising is used as an evaporation heat source of a heater, so that the heat efficiency of the device is improved; and the liquid outlet of the gas washing tower is connected with the liquid inlet of the crystallization separator, so that the waste liquid generated in the gas washing tower can return to the crystallization separator to participate in the evaporation crystallization process, solid-liquid separation is carried out, distilled water is recovered, and the gas washing system does not generate extra waste water, thereby achieving the purpose of zero discharge of waste water.
Furthermore, the gas outlet of the heater is connected with the gas inlet of the exhaust condenser, the non-condensed steam generated by the salt-containing wastewater in the evaporative crystallization process can return to the exhaust condenser, the salt-containing wastewater is continuously used as a heat source of the exhaust condenser to exchange heat with the salt-containing wastewater, and atomized steam carried in the non-condensed steam is condensed into distilled water while the liquid inlet temperature is increased, so that the steam and heat are recovered, and the thermal efficiency of the device is further improved.
Drawings
FIG. 1 is a schematic structural view of a salt-containing wastewater treatment apparatus according to an embodiment.
Detailed Description
In order to facilitate understanding of the present invention, the present invention will be described more fully hereinafter with reference to the accompanying drawings. The preferred embodiments of the present invention are shown in the drawings. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1, an embodiment of the present invention provides a salt-containing wastewater treatment apparatus 100, including: a heat exchanger 101, an exhaust gas condenser 102, a crystallization separator 103, a scrubber 104, a vapor compressor 105, a heater 106, and a forced circulation pump 107.
A first liquid outlet of the heat exchanger 101 is connected with a first liquid inlet of an exhaust condenser 102, a first liquid outlet of the exhaust condenser 102 is connected with a liquid inlet of a crystallization separator 103, a gas outlet of the crystallization separator 103 is connected with a gas inlet of a gas washing tower 104, a gas outlet of the gas washing tower 104 is connected with a gas inlet of a vapor compressor 105, a gas outlet of the vapor compressor 105 is connected with a gas inlet of a heater 106, and a liquid outlet of the gas washing tower 104 is connected with a liquid inlet of the crystallization separator 103.
The liquid outlet of the crystallization separator 103 is connected with the liquid inlet of a forced circulation pump 107, and the liquid outlet of the forced circulation pump 107 is connected with the liquid inlet of a heater 106. The first liquid outlet of the heater 106 is connected to the liquid inlet of the crystallization separator 103.
The saline wastewater treatment apparatus 100 may be used for treatment of saline wastewater to be treated. During operation, the salt-containing wastewater to be treated is preheated in the heat exchanger 101, the preheated salt-containing wastewater enters the exhaust condenser 102, steam carried by the preheated salt-containing wastewater is condensed in the exhaust condenser 102, the salt-containing wastewater is further heated by heat generated by condensation, the heated salt-containing wastewater enters the crystallization separator 103 to be subjected to flash evaporation, the salt-containing wastewater is concentrated and steam is released, the steam is subjected to gas washing in the gas washing tower 104, low-boiling-point fatty acid or other organic substances carried in the steam are removed, and therefore VOC in the steam is reduced; the steam after the washing is extracted by the steam compressor 105 to raise the temperature and pressure, and the steam after the temperature rise is used as a heat generation source of the heater 106.
In some of these embodiments, the outlet of the heater 106 is connected to the inlet of the exhaust condenser 102.
During operation, the non-condensed steam generated by the salt-containing wastewater in the evaporative crystallization process can return to the exhaust condenser 102 and continuously serve as a heat source of the exhaust condenser 102 to exchange heat with the salt-containing wastewater entering the exhaust condenser 102, and atomized steam carried in the non-condensed steam is condensed into distilled water while the temperature of the salt-containing wastewater is increased, so that steam and heat are recovered, and the thermal efficiency of the device is further increased.
Meanwhile, the liquid outlet of the gas washing tower 104 is connected with the liquid inlet of the crystallization separator 103, so that the waste liquid generated in the gas washing tower 104 can return to the crystallization separator 103 to participate in the evaporation crystallization process, and no additional waste water is generated in the gas washing process.
Under the action of the forced circulation pump 105, the salt-containing wastewater is continuously heated and crystallized in the heater 106 and the crystallization separator 103, the heated circulating liquid flows out of the heater 106 to the low-pressure crystallization separator 103, and the circulating liquid is flashed at the low-pressure crystallization separator 103 due to the sudden reduction of the pressure, so that the salt-containing wastewater is concentrated, and secondary steam is generated at the same time.
Further, an exhaust port is arranged on the exhaust condenser 102; the treated non-condensed steam is discharged from an exhaust port.
In some of the embodiments, the apparatus 100 further comprises a first transfer pump 117, which is located on the pipeline connected between the liquid outlet of the scrubber tower 104 and the liquid inlet of the crystal separator 103, to provide power for circulating the waste liquid of the scrubber tower 104 to the crystal separator 103.
In some embodiments, a spraying device is arranged at the top of the gas washing tower 104, and a liquid outlet of the first transfer pump 117 is connected with the spraying device in the gas washing tower 104; the washing liquid enters the spraying device in the gas washing tower 104 under the action of the first transfer pump 117.
Waste liquid generated after steam is subjected to gas washing enters the crystallization separator 103 through a connecting pipeline of the first conveying pump 117 and the crystallization separator 103 to participate in crystallization and evaporation, solid is separated out, and distilled water is recycled, so that additional waste water is not generated.
Further, the saline wastewater treatment device 100 further comprises a washing liquid conveying device 118. The washing liquid conveying device 118 comprises a washing liquid pump 1181 and a washing liquid tank 1182, wherein a liquid outlet of the washing liquid tank 1182 is connected with a liquid inlet of the gas washing tower 104, and the washing liquid tank 1182 is used for storing the washing liquid and transmitting the washing liquid to the gas washing tower 104 for use. Further, the washing liquid conveying device 118 further includes a washing liquid pump 1181, and the washing liquid pump 1181 is disposed on a connection pipeline between a liquid outlet of the washing liquid tank 1182 and a liquid inlet of the gas washing tower 104. The washing liquid stored in the washing liquid tank 1182 is pumped into the gas washing tower 104 by the washing liquid pump 1181, and the washing liquid enters the spraying device in the gas washing tower 104 through the first conveying pump 117.
In some embodiments, the scrubber tower 104 employs a gas-liquid reverse absorption method, the scrubber solution is sprayed downward in a mist (or small droplets) by a spraying device at the top of the scrubber tower 104, and the vapor flows upward from the bottom of the scrubber tower 104 in a counter-current manner, so as to achieve sufficient contact between the gas and the liquid.
Further, the top of the scrubber tower 104 is also provided with a demisting system, and the secondary steam after scrubbing passes through the demisting system to remove entrained mist water droplets.
It is understood that the demister system of the scrubber tower 104 is disposed above the spray system.
In some of these embodiments, the crystallization separator 103 described above employs a salt leg crystallizer. The top of the salt leg crystallizer is provided with an integrated baffle plate and wire mesh demister. Adopt the baffling board of integral type to add the silk screen defroster, the defogging is efficient.
In some embodiments, the saline wastewater treatment device 100 further includes a concentrate pump 108, a thickener 109, a solid-liquid separator 110, a mother liquor tank 111, and a mother liquor pump 112.
The liquid outlet of the crystallization separator 103 is connected with the liquid inlet of the thickener 108, the first liquid outlet of the thickener 108 is connected with the liquid inlet of the solid-liquid separator 110, the liquid outlet of the solid-liquid separator 110 is connected with the liquid outlet of the mother liquor tank 111, and the liquid outlet of the mother liquor tank 111 is connected with the liquid inlet of the crystallization separator 103.
The concentrated liquid pump 108 is arranged on a connecting pipeline between the liquid outlet of the crystallization separator 103 and the liquid inlet of the thickener 108; the mother liquor pump 112 is arranged on a connecting pipeline between the liquid outlet of the mother liquor tank 111 and the liquid inlet of the crystal separator 103.
Further, the solid-liquid separator 110 is provided with a solid outlet D.
During operation, when salt-containing wastewater reaches the concentration multiple of the process requirement through evaporation crystallization in the centrifugal separator 103, the salt-containing wastewater enters the thickener 109 for pre-separation, and then passes through the solid-liquid separator 110 to separate centrifugal mother liquor and solids, the solids are discharged from the solid outlet D on the solid-liquid separator 110, and the centrifugal mother liquor returns to the crystallization separator 103 through the mother liquor tank 110 and the mother liquor pump 111 to continue the evaporation concentration process.
In some embodiments, the thickener 109 is further provided with a second liquid outlet; the second liquid outlet of the thickener 109 is connected with the liquid inlet of the crystallization separator 103.
When the salt-containing wastewater is concentrated to reach the concentration multiple of the process requirement, the salt-containing wastewater enters the thickener 109, crystals in the concentrated solution further grow to carry out primary separation of solid and liquid, the upper layer liquid flows back to the crystallization separator 103 through a second liquid outlet in the thickener 109 to continuously participate in evaporative crystallization, and the lower layer concentrated solution enters the solid-liquid separator 110.
In some of the embodiments, the saline wastewater treatment apparatus 100 further includes a distilled water tank 113 and a distilled water pump 114.
A second liquid outlet of the heater 104 is connected with a liquid inlet of the distilled water tank 113, a liquid outlet of the distilled water tank 113 is connected with a liquid inlet of the distilled water pump 114, and a liquid outlet of the distilled water pump 114 is connected with a first liquid inlet of the heat exchanger 101. Further, the heat exchanger 101 is provided with a second liquid outlet C.
Steam generated by evaporating and crystallizing the salt-containing wastewater returns to the heater 104 to be used as a steaming heat source, and is condensed to obtain distilled water after being subjected to heat exchange with circulating liquid in a heat exchange tube entering the heater 104, the distilled water is stored in a distilled water tank 113 and is conveyed to the heat exchanger 101 by a distilled water pump 114 to be used as a heat source, and the distilled water is discharged out of a system through a second liquid outlet C on the heat exchanger 101 after being subjected to heat exchange with the salt-containing wastewater, so that the heat discharged by the distilled water can be greatly recovered, the heat efficiency is improved, and the recovered distilled water reaches the discharge standard: COD 100 mg/L. In some of these embodiments, the second liquid outlet of the vent condenser 102 is connected to a liquid inlet of the distilled water tank 113. The distilled water produced in the vent condenser 102 is stored in a distilled water tank 113 to further recover the distilled water.
In some of the embodiments, further, the distilled water tank 113 is further provided with an air outlet, and the steam outlet is connected with the saturated steam inlet of the crystallization separator 103. In this way, the saturated steam generated from the condensed water flowing into the distilled water tank 113 is returned to the crystal separator 103 to be forcibly circulated, thereby further improving the thermal efficiency of the apparatus, further ensuring the thermal balance of the entire apparatus, and further ensuring the stability of the operation conditions.
Further, the crystallization separator 103 is also provided with a saturated steam inlet E. According to the practical application, a small amount of additional saturated steam is introduced through the saturated steam inlet E of the crystallization separator 103 to maintain the heat balance of the whole device and ensure the stability of the operation condition.
In some embodiments, the saline wastewater treatment device 100 further comprises a feed liquid tank 115 and a feed liquid delivery pump 116, and a liquid outlet of the feed liquid delivery pump 116 is connected with a second liquid inlet on the heat exchanger 101.
Further, the feed liquid tank 115 is provided with a feed liquid inlet a and a tap water inlet C. The salt-containing wastewater enters the device through the feed liquid inlet A.
Further, contain salt effluent treatment plant 10 and still include belt cleaning device 119, belt cleaning device 119 includes chemical agent jar 1192, and the liquid outlet of chemical agent jar 1192 is connected with the inlet of crystallization separator 103. The chemical tank 1192 is used to store chemicals and deliver them to the crystal separator 103 to clean the crystal separator 103. Further, the cleaning device 119 further includes a chemical agent pump 1191, and the chemical agent pump 1191 is disposed on a connection pipeline between the liquid outlet of the chemical agent tank 1192 and the liquid inlet of the crystallization separator 103.
The chemical agent stored in the chemical agent tank 1192 is pumped into the crystallization separator 103 through the chemical agent pump 1191, and a PLC automatic control device is arranged to control the cleaning device 119 to clean the crystallization separator 103 regularly, so that the long-term treatment water quantity and the stable water quality of the discharged water can be ensured.
In some of these embodiments, the brine wastewater treatment plant 100 further comprises a mother liquor tank 120, a second transfer pump 121, a spray drying tower 123, and a fan 124.
The liquid inlet of the mother liquor tank 120 is connected with the liquid outlet of the mother liquor pump 121, the liquid outlet of the mother liquor tank 120 is connected with the liquid inlet of the spray drying tower 123, and the liquid outlet of the spray drying tower 123 is connected with the liquid inlet of the fan 124. The second transfer pump 121 is located on a connecting pipeline between the liquid outlet of the mother liquor tank 120 and the liquid inlet of the spray drying tower 123.
When the centrifugal mother liquor in the mother liquor pump 111 reaches the concentration multiple required by the process, the centrifugal mother liquor enters the spray drying tower 123 through the concentrate tank 120 and the second delivery pump 121, and is dried into solid in a very short time. Further, a cyclone is provided in the spray drying tower 123. The solids are continuously output from the bottom of the spray drying tower 123 and the cyclone and the exhaust gas is evacuated by the fan 124.
In some embodiments, the fan 124 is provided with a cooling water outlet G, a cooling water inlet F and an exhaust port, and the exhaust gas is exhausted through the exhaust port.
The utility model discloses a contain salt effluent treatment plant can handle the waste water that contains the sodium salt in the concrete example of the utility model discloses an in, the waste water that contains the sodium salt is a washing waste water of heat accumulation formula thermal oxidizer, waste water quality: pH 7-8, COD 1300mg/L, NaHCO3:10000mg/L，NaHSO3：30000mg/L，Na2SO3：70000mg/L。
With continued reference to fig. 1, in a specific example of the present invention, the salt-containing wastewater is treated as follows:
when the salt-containing wastewater works, the salt-containing wastewater to be treated is preheated in the heat exchanger 101, the preheated salt-containing wastewater enters the exhaust condenser 102, steam carried by the preheated salt-containing wastewater is condensed in the exhaust condenser 102, the salt-containing wastewater is further heated by heat generated by condensation, the heated waste liquid enters the crystallization separator 103 to be subjected to flash evaporation, the salt-containing wastewater is concentrated and steam is released, the steam is subjected to gas washing in the gas washing tower 104, low-boiling-point fatty acid or other organic substances carried in the steam are removed, and therefore VOC in the steam is reduced; the steam after the gas washing is pumped out by the steam compressor 105 for temperature rise and pressure rise, the steam after the temperature rise is used as a steaming heat source of the heater 106, the steam is condensed after heat exchange to obtain distilled water, the distilled water is stored in the distilled water tank 113, the distilled water is conveyed to the heat exchanger 101 by the distilled water pump 114 to be used as a heat source, and the distilled water exchanges heat with the salt-containing wastewater and is discharged out of the system through a second liquid outlet C on the heat exchanger 101.
Meanwhile, the non-condensed steam generated in the evaporation and crystallization process of the salt-containing wastewater can return to the exhaust condenser 102 and continue to be used as a heat source of the exhaust condenser 102 to exchange heat with the salt-containing wastewater, and atomized steam carried in the non-condensed steam is condensed into distilled water while the inlet liquid temperature is increased, so that steam and heat are recovered. Meanwhile, the liquid outlet of the gas washing tower 104 is connected with the liquid inlet of the crystallization separator 103, so that the waste liquid generated in the gas washing tower 104 can return to the crystallization separator to participate in the evaporation crystallization process, and the gas washing system does not generate additional waste water.
The waste liquid after the temperature raising enters the crystallization separator 103 to be mixed with the original circulating liquid, and the generated mixed liquid is shunted to the heat exchange pipe of the heater 106 under the action of the forced circulation pump 107 to be heated and evaporated. The heated mixed liquid flows out of the heater to the low-pressure crystallization separator 103, the circulating liquid is subjected to flash evaporation due to the sudden reduction of the pressure, concentrated liquid is obtained, secondary steam is generated at the same time, and the secondary steam continuously enters the gas washing tower to continuously recover heat and distilled water.
Specifically, the lye is sprayed out from the spraying device arranged at the top of the scrubber tower 104 to remove the low boiling point fatty acid or other organic substances carried in the steam, thereby reducing the VOC in the steam, improving the water quality of the effluent, and leading the recovered distilled water to reach the emission standard: COD 100 mg/L.
When the concentrated solution reaches the concentration multiple of the process requirement, the concentrated solution enters the thickener 109, crystals in the concentrated solution further grow to perform primary separation of solid and liquid, the upper layer of liquid flows back to the crystallization separator 103 through a second liquid outlet in the thickener 109 to continuously participate in evaporative crystallization, the lower layer of concentrated solution enters the solid-liquid separator 110 to separate centrifugal mother solution and solid, the solid is discharged from a solid outlet D on the solid-liquid separator 110, and the centrifugal mother solution returns to the crystallization separator 103 through the mother solution tank 110 and the mother solution pump 111 to continuously perform the evaporative concentration process.
When the centrifugal mother liquor reaches the concentration multiple required by the process, the centrifugal mother liquor enters the mother liquor tank 120, enters the spray drying tower 123 through the second conveying pump 121, is dried to obtain a solid, the solid is continuously output from the bottom of the spray drying tower 123 and the cyclone separator, and the waste gas is discharged by the fan 124.
In the above specific example, the washing liquid in the washing system is lye; the forced circulation pump is controlled by VFD (variable frequency drive), the system is initially started to run, and the frequency is automatically adjusted within the range of 0-50 Hz according to the automatic detection of the specific gravity and the outlet pressure so as to meet the circulation flow requirement; the flow velocity of each heat exchange tube in the forced circulation pump is controlled to be 1.5-3.5 m/s, so that the scaling probability is reduced, and the heat exchange efficiency is prevented from being influenced.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (10)
1. A salt-containing wastewater treatment device is characterized by comprising: the system comprises a heat exchanger, an exhaust condenser, a crystallization separator, a gas washing tower, a steam compressor, a heater and a forced circulation pump; a first liquid outlet of the heat exchanger is connected with a liquid inlet of the exhaust condenser, a first liquid outlet of the exhaust condenser is connected with a liquid inlet of the crystallization separator, a gas outlet of the crystallization separator is connected with a gas inlet of the gas washing tower, a gas outlet of the gas washing tower is connected with a gas inlet of the vapor compressor, a gas outlet of the vapor compressor is connected with a gas inlet of the heater, and a liquid outlet of the gas washing tower is connected with a liquid inlet of the crystallization separator;
the liquid outlet of the crystallization separator is connected with the liquid inlet of the forced circulation pump, and the liquid outlet of the forced circulation pump is connected with the liquid inlet of the heater; and a first liquid outlet of the heater is connected with a liquid inlet of the crystallization separator.
2. The apparatus for treating wastewater containing salt according to claim 1, wherein the outlet of the heater is connected to the inlet of the exhaust condenser.
3. The apparatus for treating wastewater containing salt according to claim 1, further comprising a first transfer pump on a pipeline connecting the liquid outlet of the scrubber tower and the liquid inlet of the crystallization separator.
4. The saline wastewater treatment device according to claim 1, further comprising a liquid washing tank, wherein a liquid outlet of the liquid washing tank is connected with a liquid inlet of the gas washing tower.
5. The saline wastewater treatment device according to any one of claims 1 to 4, further comprising a concentrate pump, a thickener, a solid-liquid separator, a mother liquor tank and a mother liquor pump;
the liquid outlet of the crystallization separator is connected with the liquid inlet of the thickener, the first liquid outlet of the thickener is connected with the liquid inlet of the solid-liquid separator, the liquid outlet of the solid-liquid separator is connected with the liquid outlet of the mother liquid tank, and the liquid outlet of the mother liquid tank is connected with the liquid inlet of the crystallization separator;
the concentrated liquid pump is arranged on a connecting pipeline between the liquid outlet of the crystallization separator and the liquid inlet of the thickener; the mother liquor pump is arranged on a connecting pipeline between a liquid outlet of the mother liquor tank and a liquid inlet of the crystallization separator.
6. The brine wastewater treatment device according to claim 5, wherein the second liquid outlet of the thickener is connected with the liquid inlet of the crystallization separator.
7. The apparatus for treating wastewater containing salt according to claim 6, further comprising a mother liquor tank, a second transfer pump, a spray drying tower and a fan; a liquid inlet of the mother liquid tank is connected with a liquid outlet of the mother liquid pump, a liquid outlet of the mother liquid tank is connected with a liquid inlet of the spray drying tower, and a liquid outlet of the spray drying tower is connected with a liquid inlet of the fan; and the second delivery pump is positioned on a connecting pipeline between the liquid outlet of the mother liquid tank and the liquid inlet of the spray drying tower.
8. The apparatus for treating wastewater containing salt according to any one of claims 1 to 4, further comprising a distilled water tank; and a second liquid outlet of the heater is connected with a liquid inlet of the distilled water tank, and a liquid outlet of the distilled water tank is connected with a first liquid inlet of the heat exchanger.
9. The apparatus for treating wastewater containing salt according to claim 8, wherein the saturated steam inlet of the crystallization separator is connected with the gas outlet of the distilled water tank.
10. The brine wastewater treatment device of any one of claims 1 to 4, further comprising a chemical agent tank, wherein a liquid outlet of the chemical agent tank is connected with a liquid inlet of the crystallization separator.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021866288.8U CN214004100U (en) | 2020-08-31 | 2020-08-31 | Contain salt effluent treatment plant |
| PCT/CN2020/126204 WO2022041476A1 (en) | 2020-08-31 | 2020-11-03 | Salt-containing wastewater treatment apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021866288.8U CN214004100U (en) | 2020-08-31 | 2020-08-31 | Contain salt effluent treatment plant |
Publications (1)
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| CN205473138U (en) * | 2016-01-11 | 2016-08-17 | 中国石油化工股份有限公司 | Comprehensive processing apparatus of alkaline residue waste liquid |
| CN206444229U (en) * | 2016-12-21 | 2017-08-29 | 北京燕山翔宇环保工程技术有限公司 | MVR evaporation and crystallization systems and industrial alkali waste liquid treating system |
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| CN208648802U (en) * | 2018-06-20 | 2019-03-26 | 江苏捷斯安环保科技有限公司 | For handling the efficient MVR evaporation and crystallization system of high-COD waste water with high salt |
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