CN210117305U - Heat pump low temperature divides effluent treatment plant of salt - Google Patents
Heat pump low temperature divides effluent treatment plant of salt Download PDFInfo
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- CN210117305U CN210117305U CN201920029846.6U CN201920029846U CN210117305U CN 210117305 U CN210117305 U CN 210117305U CN 201920029846 U CN201920029846 U CN 201920029846U CN 210117305 U CN210117305 U CN 210117305U
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Abstract
The utility model discloses a heat pump low temperature divides effluent treatment plant of salt uses the heat source heating evaporative concentration waste water of heat pump, uses the cold source refrigeration cooling waste water of heat pump, utilizes the characteristic that the sodium sulfate solubility changes along with temperature variation, makes the sodium sulfate appear to use the steam of secondary to carry out the evaporative crystallization of sodium chloride, the hot melt purification crystallization of sodium sulfate. The utility model adopts the heat source and the cold source of the heat pump to carry out waste water desalination treatment, and the energy consumption is extremely low; because of low-pressure and low-temperature evaporation, the requirement on equipment is low, a large amount of non-metallic materials can be used, and the investment is less; and has the advantages of low vibration and low noise.
Description
Technical Field
The utility model relates to a waste water treatment field, in particular to waste water treatment device of salt is divided to heat pump low temperature.
Background
The industrial wastewater has the characteristics of high salt content, complex components, high pollution and the like, and must be reasonably treated, zero discharge of the high-salt wastewater gradually becomes an inevitable requirement for environmental protection, the treatment cost of the industrial wastewater in China is high at present, solid miscellaneous salt wastes which are difficult to utilize and almost useless are usually formed through an evaporative crystallization process with high energy consumption, then the treatment is carried out by thousands of yuan of commission, and only a few dangerous waste treatment centers in China can treat the miscellaneous salts, so that the treatment cost is high, and the burden of enterprises is heavy.
The industrial wastewater often contains a large amount of sodium sulfate and sodium chloride, and particularly in mine tail water/coal chemical wastewater, 85-95% of the components are sodium chloride and sodium sulfate. Therefore, the method has great application value in separating and extracting sodium chloride and sodium sulfate crystals from industrial wastewater.
The device for separating and extracting sodium chloride and sodium sulfate crystals at present requires a higher concentration during evaporation and concentration, needs long-time heating and evaporation, has longer process chain and high investment and operation cost, is not suitable for the requirements of enterprises, and is not beneficial to large-area popularization and application.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a heat pump low temperature divides effluent treatment plant of salt is provided, drops into lower, and more energy-conserving.
In order to achieve the above purpose, the utility model discloses a heat pump low temperature divides effluent treatment plant of salt, include:
a heat pump having a high temperature end and a low temperature end;
the evaporation concentrator comprises a heating cavity for containing the wastewater, and the heating cavity is in heat exchange connection with the high-temperature end;
the freezing crystallizer comprises a cooling cavity for containing wastewater, and the cooling cavity is in heat exchange connection with the low-temperature end;
the freezing centrifuge is communicated with the cooling cavity, so that a solid-liquid mixture in the cooling cavity enters the freezing centrifuge for solid-liquid separation;
the sodium sulfate evaporative crystallizer comprises a sodium sulfate evaporative crystallization cavity and a sodium sulfate heating device for increasing the temperature in the sodium sulfate evaporative crystallization cavity, wherein the sodium sulfate evaporative crystallization cavity is communicated with a solid discharge port of the refrigerated centrifuge, so that the solid obtained by separation of the refrigerated centrifuge enters the sodium sulfate evaporative crystallization cavity;
the sodium sulfate centrifuge is communicated with the sodium sulfate evaporation crystallization cavity, so that a solid-liquid mixture in the sodium sulfate evaporation crystallization cavity enters the sodium sulfate centrifuge for solid-liquid separation;
the sodium chloride evaporative crystallizer comprises a sodium chloride evaporative crystallization cavity and a sodium chloride heating device for increasing the temperature in the sodium chloride evaporative crystallization cavity, wherein the sodium chloride evaporative crystallization cavity is communicated with a liquid discharge port of the refrigerated centrifuge, so that wastewater separated by the refrigerated centrifuge enters the sodium chloride evaporative crystallization cavity;
and the sodium chloride centrifugal machine is communicated with the sodium chloride evaporation crystallization cavity, so that a solid-liquid mixture in the sodium chloride evaporation crystallization cavity enters the sodium chloride centrifugal machine for solid-liquid separation.
Preferably, a liquid discharge port of the sodium sulfate centrifuge is communicated with the warming cavity, so that the wastewater separated by the sodium sulfate centrifuge enters the warming cavity to be recirculated, and a liquid discharge port of the sodium chloride centrifuge is communicated with the warming cavity, so that the wastewater separated by the sodium chloride centrifuge enters the warming cavity to be recirculated.
Preferably, the high-temperature end is connected with the warming cavity in a heat exchange manner through a first heat exchanger, and the low-temperature end is connected with the cooling cavity in a heat exchange manner through a second heat exchanger.
Preferably, a sodium sulfate kettle bottom liquid outlet is arranged on a pipeline communicating the sodium sulfate centrifuge liquid outlet with the temperature rising cavity, and a sodium chloride kettle bottom liquid outlet is arranged on a pipeline communicating the sodium chloride centrifuge liquid outlet with the temperature rising cavity.
Preferably, the sodium sulfate heating device is communicated with the temperature rising cavity, so that the secondary steam in the temperature rising cavity heats the substances in the sodium sulfate evaporation crystallization cavity through the sodium sulfate heating device, and the sodium chloride heating device is communicated with the temperature rising cavity, so that the secondary steam in the temperature rising cavity heats the substances in the sodium chloride evaporation crystallization cavity through the sodium chloride heating device.
Preferably, the sodium sulfate heating device is including setting up the sodium sulfate heating intermediate layer of sodium sulfate evaporation crystallization chamber outer wall, sodium sulfate heating intermediate layer with the intensification chamber intercommunication, sodium chloride heating device is including setting up the sodium chloride heating intermediate layer of sodium chloride evaporation crystallization chamber outer wall, sodium chloride heating intermediate layer with the intensification chamber intercommunication.
The utility model discloses the process that realizes low temperature and divides salt does: heating the temperature rising cavity by using the high-temperature end, heating, evaporating and concentrating wastewater in the temperature rising cavity, then feeding the wastewater into the temperature reducing cavity, cooling the temperature reducing cavity by using the low-temperature end, cooling and crystallizing the wastewater in the temperature reducing cavity, then feeding the wastewater into the refrigerated centrifuge, and centrifugally separating by using the centrifuge to obtain sodium sulfate decahydrate and sodium chloride mother liquor;
sodium sulfate decahydrate enters the sodium sulfate evaporation crystallization cavity from a solid discharge port of the freezing centrifuge, the temperature of the sodium sulfate evaporation crystallization cavity is raised by using the sodium sulfate heating device, the sodium sulfate decahydrate is heated, melted, evaporated and crystallized and then enters the sodium sulfate centrifuge, and the sodium sulfate centrifuge is used for separating to obtain sodium sulfate crystals and sodium sulfate residual liquid;
and sodium chloride mother liquor enters the sodium chloride evaporation crystallization cavity from a liquid discharge port of the refrigerated centrifuge, the sodium chloride evaporation crystallization cavity is heated by using the sodium chloride heating device, the sodium chloride mother liquor enters the sodium chloride centrifuge after being heated, evaporated, concentrated and crystallized, and the sodium chloride centrifuge is used for separating to obtain sodium chloride crystals and sodium chloride residual liquid.
Compared with the prior art, the beneficial effects of the utility model reside in that:
the waste water is heated, evaporated and concentrated by utilizing the heat source of the heat pump, the waste water with moderate concentration is cooled and crystallized by utilizing the cold source of the heat pump, and sodium sulfate is separated out from the waste water with moderate concentration according to the characteristic that the solubility of the sodium sulfate is reduced along with the reduction of the temperature, so that sodium sulfate decahydrate crystals are obtained, the cold and heat sources are respectively and fully utilized, and the energy consumption is reduced by more than 50 percent compared with the prior art;
the mother liquor containing all sodium chloride and part of sodium sulfate is evaporated and concentrated by utilizing secondary steam of an evaporation concentrator, and sodium chloride is concentrated and separated out according to the characteristic that the solubility of the sodium sulfate is increased along with the temperature rise and the characteristic that the solubility of the sodium chloride is not influenced along with the temperature change, and the sodium sulfate does not reach the separation concentration due to the increase of the solubility, so that sodium chloride crystals are obtained without additional energy consumption;
the high-temperature end and the low-temperature end of the heat pump are respectively connected with the evaporative crystallization system through the heat exchanger, the heat pump is not contacted with wastewater, the operation is more stable, the maintenance period is longer, and the operation life is longer;
the evaporation process is low-temperature and normal-pressure evaporation, the requirement on evaporation equipment is low, a large amount of non-metallic materials can be used, the investment is less, and the device has the advantages of low noise and low vibration.
Drawings
Fig. 1 is a schematic view of the overall structure of the embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail with reference to the accompanying drawings of fig. 1.
Referring to fig. 1, the heat pump low-temperature salt separation wastewater treatment device comprises:
the heat pump 1, the heat pump 1 has a high temperature end 11 for continuously heating and a low temperature end 12 for continuously cooling;
the evaporation concentrator 3 comprises a temperature rising cavity 31, wastewater enters the temperature rising cavity 31 through a wastewater inlet 32, the temperature rising cavity 31 is in heat exchange connection with the high-temperature end 11 through a first heat exchanger 2A, and heat of the high-temperature end 11 is transferred into the temperature rising cavity 31 through the first heat exchanger 2A, so that the wastewater in the temperature rising cavity is heated, evaporated and concentrated, but the crystallization concentrations of sodium sulfate and sodium chloride are not required to be reached, the evaporation time is shorter, the temperature is lower, and the energy consumption is less;
the freezing crystallizer 4 comprises a cooling cavity 41, the cooling cavity 41 is in heat exchange connection with the low-temperature end 12 through a second heat exchanger 2B, the waste water after being heated, evaporated and concentrated in the evaporation concentrator 3 is conveyed into the cooling cavity 41 through a first conveying pipe 33 and a first conveying pump 34 to be rapidly cooled, and a large amount of sodium sulfate decahydrate crystals are separated out in the waste water cooling process as the solubility of sodium sulfate is reduced along with the reduction of the temperature;
a freezing centrifuge 5, wherein the freezing centrifuge 5 is communicated with the cooling cavity 41, so that a solid-liquid mixture in the cooling cavity 41 enters the freezing centrifuge 5 to undergo solid-liquid separation to obtain sodium sulfate decahydrate crystals and sodium chloride mother liquor, and the sodium chloride mother liquor contains all sodium chloride and a small part of sodium sulfate;
the sodium sulfate evaporative crystallizer 6 comprises a sodium sulfate evaporative crystallization cavity 61 and a sodium sulfate heating device for increasing the temperature in the sodium sulfate evaporative crystallization cavity 61, wherein the sodium sulfate evaporative crystallization cavity 61 is communicated with a solid discharge port 51 of the refrigerated centrifuge 5, so that sodium sulfate decahydrate crystals obtained by separation by the refrigerated centrifuge 5 enter the sodium sulfate evaporative crystallization cavity 61; the sodium sulfate heating device comprises a sodium sulfate heating interlayer 62 arranged on the outer wall of the sodium sulfate evaporation crystallization cavity 61, the sodium sulfate heating interlayer 62 is communicated with the warming cavity 31, secondary steam generated by evaporation in the warming cavity 31 is conveyed into the sodium sulfate heating interlayer 62 through a second conveying pipe 35 and a second conveying pump 36, so that the outer wall of the sodium sulfate evaporation crystallization cavity 61 is heated, and condensed water generated by the secondary steam on the outer wall of the sodium sulfate evaporation crystallization cavity 61 is discharged through a first condensed water discharge port 63; heating the sodium sulfate decahydrate in the sodium sulfate crystallization cavity 61, heating, hot melting, evaporating and crystallizing to form anhydrous sodium sulfate crystals
A sodium sulfate centrifuge 7, wherein the sodium sulfate centrifuge 7 is communicated with the sodium sulfate evaporation crystallization cavity 61, so that a solid-liquid mixture in the sodium sulfate evaporation crystallization cavity 61 enters the sodium sulfate centrifuge 7 to carry out solid-liquid separation to obtain anhydrous sodium sulfate crystals and sodium sulfate residual liquid;
the sodium chloride evaporative crystallizer 8 comprises a sodium chloride evaporative crystallization cavity 81 and a sodium chloride heating device for increasing the temperature in the sodium chloride evaporative crystallization cavity 81, wherein the sodium chloride evaporative crystallization cavity 81 is communicated with a liquid discharge port 52 of the refrigerated centrifuge 5, so that sodium chloride mother liquor obtained by separation of the refrigerated centrifuge 5 enters the sodium chloride evaporative crystallization cavity 81; the sodium chloride heating device comprises a sodium chloride heating interlayer 82 arranged on the outer wall of the sodium chloride evaporation crystallization cavity 81, the sodium chloride heating interlayer 82 is communicated with the warming cavity 31, secondary steam generated by evaporation in the warming cavity 31 is conveyed into the sodium chloride heating interlayer 82 through a second conveying pipe 35 and a second conveying pump 38 so as to heat the outer wall of the sodium chloride evaporation crystallization cavity 81, and condensed water generated by the secondary steam on the outer wall of the sodium chloride evaporation crystallization cavity 81 is discharged through a first condensed water outlet 83; the sodium chloride mother liquor contains all sodium chloride and a small part of sodium sulfate, the sodium chloride mother liquor is heated in a sodium chloride evaporation crystallization cavity 81 for evaporation, concentration and crystallization, the sodium sulfate content is low, and the solubility of the sodium sulfate is increased along with the increase of the temperature, so that the sodium sulfate does not reach the crystallization concentration and cannot be separated out, the solubility of the sodium chloride does not change along with the change of the temperature, and the concentration is increased along with the increase of the evaporation to reach the crystallization concentration of the sodium chloride, so that sodium chloride crystals are separated out;
and the sodium chloride centrifuge 9 is communicated with the sodium chloride evaporation crystallization cavity 81, so that the solid-liquid mixture in the sodium chloride evaporation crystallization cavity 81 enters the sodium chloride centrifuge 9 to carry out solid-liquid separation to obtain sodium chloride crystals and sodium chloride residual liquid.
A liquid discharge port 71 of the sodium sulfate centrifuge 7 is communicated with the temperature rising cavity 31 through a third conveying pipe 37 and a third conveying pump 38, so that sodium sulfate residual liquid separated by the sodium sulfate centrifuge 7 enters the temperature rising cavity 31 for recycling; the liquid discharge port 91 of the sodium chloride centrifuge 9 is communicated with the warming cavity 31 through the third conveying pipe 37 and the third conveying pump 38, so that the sodium chloride residual liquid separated by the sodium chloride centrifuge 9 enters the warming cavity 31 for recycling.
A sodium sulfate kettle bottom liquid outlet 72 is arranged between the liquid outlet 71 of the sodium sulfate centrifuge 7 and the third conveying pipe 37 and is used for discharging viscous kettle bottom liquid in sodium sulfate residual liquid; a sodium chloride kettle bottom liquid outlet 92 is arranged between the liquid outlet 91 of the sodium chloride centrifuge 9 and the third conveying pipe 37 and is used for discharging viscous kettle bottom liquid in sodium chloride residual liquid.
Referring to fig. 1, the embodiment of the present invention provides a process for separating salt at low temperature:
the waste water enters the temperature-rising cavity 31, primary evaporation concentration is carried out by utilizing heat production and temperature rise of the high-temperature end 11 of the heat pump 1, low-temperature and low-pressure evaporation is realized, time consumption is low, and energy consumption is less;
the wastewater after primary evaporation concentration enters a cooling cavity 41, the wastewater is cooled by refrigeration generated at the low-temperature end 12 of the heat pump 1, the solubility of sodium sulfate is reduced along with the reduction of temperature, and the solubility of sodium chloride is not changed along with the change of temperature, so that a large amount of sodium sulfate decahydrate is separated out, sodium chloride is not separated out, and the wastewater is separated in a refrigerated centrifuge 5 to obtain sodium sulfate decahydrate crystals and sodium chloride mother liquor;
enabling the sodium sulfate decahydrate crystals to enter a sodium sulfate evaporation crystallization cavity 61, heating the sodium sulfate evaporation crystallization cavity 61 by using secondary steam generated by a heating cavity 31, carrying out hot melting evaporation crystallization on the sodium sulfate decahydrate crystals in the sodium sulfate evaporation crystallization cavity 61, separating by using a sodium sulfate centrifuge 7 to obtain anhydrous sodium sulfate crystals and sodium sulfate residual liquid, and returning the sodium sulfate residual liquid to the heating cavity 31 for recycling after removing kettle bottom liquid;
the sodium chloride mother liquor enters a sodium chloride evaporation crystallization cavity 81, secondary steam generated by a heating cavity 31 is used for heating the sodium chloride evaporation crystallization cavity 81, the sodium chloride mother liquor containing sodium chloride and part of sodium sulfate is heated, evaporated, concentrated and crystallized in the sodium chloride evaporation crystallization cavity 81, the sodium sulfate content is low, and the solubility of the sodium sulfate is increased along with the temperature increase, so that the sodium sulfate does not reach the crystallization concentration and cannot be separated out, the solubility of the sodium chloride does not change along with the temperature change, the concentration is increased along with the evaporation to reach the crystallization concentration of the sodium chloride, the sodium chloride crystals are separated out, a sodium chloride centrifuge 9 is used for separating to obtain the sodium chloride crystals and sodium chloride residual liquid, and the sodium chloride residual liquid returns to the heating cavity 31 to be recycled after the bottom liquid of the sodium chloride residual liquid is removed.
Of course, the above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and to implement the present invention, which cannot limit the protection scope of the present invention, and all modifications made according to the spirit of the main technical solution of the present invention should be covered within the protection scope of the present invention.
Claims (6)
1. A heat pump low-temperature salt separation wastewater treatment device is characterized by comprising:
a heat pump having a high temperature end and a low temperature end;
the evaporation concentrator comprises a heating cavity for containing the wastewater, and the heating cavity is in heat exchange connection with the high-temperature end;
the freezing crystallizer comprises a cooling cavity for containing wastewater, and the cooling cavity is in heat exchange connection with the low-temperature end;
the freezing centrifuge is communicated with the cooling cavity, so that a solid-liquid mixture in the cooling cavity enters the freezing centrifuge for solid-liquid separation;
the sodium sulfate evaporative crystallizer comprises a sodium sulfate evaporative crystallization cavity and a sodium sulfate heating device for increasing the temperature in the sodium sulfate evaporative crystallization cavity, wherein the sodium sulfate evaporative crystallization cavity is communicated with a solid discharge port of the refrigerated centrifuge, so that the solid obtained by separation of the refrigerated centrifuge enters the sodium sulfate evaporative crystallization cavity;
the sodium sulfate centrifuge is communicated with the sodium sulfate evaporation crystallization cavity, so that a solid-liquid mixture in the sodium sulfate evaporation crystallization cavity enters the sodium sulfate centrifuge for solid-liquid separation;
the sodium chloride evaporative crystallizer comprises a sodium chloride evaporative crystallization cavity and a sodium chloride heating device for increasing the temperature in the sodium chloride evaporative crystallization cavity, wherein the sodium chloride evaporative crystallization cavity is communicated with a liquid discharge port of the refrigerated centrifuge, so that wastewater separated by the refrigerated centrifuge enters the sodium chloride evaporative crystallization cavity;
and the sodium chloride centrifugal machine is communicated with the sodium chloride evaporation crystallization cavity, so that a solid-liquid mixture in the sodium chloride evaporation crystallization cavity enters the sodium chloride centrifugal machine for solid-liquid separation.
2. The heat pump low-temperature salt separation wastewater treatment device according to claim 1, wherein a liquid discharge port of the sodium sulfate centrifuge is communicated with the warming chamber, so that wastewater separated by the sodium sulfate centrifuge enters the warming chamber for recirculation, and a liquid discharge port of the sodium chloride centrifuge is communicated with the warming chamber, so that wastewater separated by the sodium chloride centrifuge enters the warming chamber for recirculation.
3. The heat pump low-temperature salt separation wastewater treatment device according to claim 2, wherein the high-temperature end is in heat exchange connection with the temperature rising chamber through a first heat exchanger, and the low-temperature end is in heat exchange connection with the temperature lowering chamber through a second heat exchanger.
4. The heat pump low-temperature salt separation wastewater treatment device according to claim 3, wherein a sodium sulfate kettle bottom liquid outlet is arranged on a pipeline communicating the sodium sulfate centrifuge liquid outlet with the warming cavity, and a sodium chloride kettle bottom liquid outlet is arranged on a pipeline communicating the sodium chloride centrifuge liquid outlet with the warming cavity.
5. The heat pump low-temperature salt separation wastewater treatment device according to any one of claims 1 to 4, wherein the sodium sulfate heating device is communicated with the temperature rising chamber, so that the secondary steam in the temperature rising chamber heats the substances in the sodium sulfate evaporation crystallization chamber through the sodium sulfate heating device, and the sodium chloride heating device is communicated with the temperature rising chamber, so that the secondary steam in the temperature rising chamber heats the substances in the sodium chloride evaporation crystallization chamber through the sodium chloride heating device.
6. The heat pump low-temperature salt separation wastewater treatment device according to claim 5, wherein the sodium sulfate heating device comprises a sodium sulfate heating interlayer arranged on the outer wall of the sodium sulfate evaporation crystallization cavity, the sodium sulfate heating interlayer is communicated with the temperature rise cavity, the sodium chloride heating device comprises a sodium chloride heating interlayer arranged on the outer wall of the sodium chloride evaporation crystallization cavity, and the sodium chloride heating interlayer is communicated with the temperature rise cavity.
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| CN201920029846.6U CN210117305U (en) | 2019-01-07 | 2019-01-07 | Heat pump low temperature divides effluent treatment plant of salt |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109607923A (en) * | 2019-01-07 | 2019-04-12 | 揭阳市德克蒸发器有限公司 | A kind of heat pump low temperature divides the wastewater treatment equipment of salt |
| CN113845262A (en) * | 2021-10-14 | 2021-12-28 | 北京华源泰盟节能设备有限公司 | Waste liquid treatment system and waste liquid treatment method |
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2019
- 2019-01-07 CN CN201920029846.6U patent/CN210117305U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109607923A (en) * | 2019-01-07 | 2019-04-12 | 揭阳市德克蒸发器有限公司 | A kind of heat pump low temperature divides the wastewater treatment equipment of salt |
| CN113845262A (en) * | 2021-10-14 | 2021-12-28 | 北京华源泰盟节能设备有限公司 | Waste liquid treatment system and waste liquid treatment method |
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Effective date of registration: 20201123 Address after: 522000 block 3, block B, Sino German cooperation and innovation base, Qiaotou village, Yujiao Town, Jiedong District, Jieyang City, Guangdong Province Patentee after: GUANGDONG DESEN ENVIRONMENTAL PROTECTION TECHNOLOGY Co.,Ltd. Address before: Room 313, 2nd Building, 3rd Floor, Area A, Small and Medium Enterprises Cooperative Innovation Base, German Metal Eco-city, Jiedong District, Jieyang City, Guangdong Province, 522000 Patentee before: JIEYANG DEKE EVAPORATOR Co.,Ltd. |