CN112408528A - Anti-fouling blocking and self-cleaning MVR evaporation concentration system - Google Patents
Anti-fouling blocking and self-cleaning MVR evaporation concentration system Download PDFInfo
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- 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
- C02F1/048—Purification of waste water by 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
- 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
- C02F1/041—Treatment of water, waste water, or sewage by heating by distillation or evaporation by means of vapour compression
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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
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Abstract
The invention relates to an anti-fouling and self-cleaning MVR evaporation concentration system, which comprises a forced circulation pump connected with a heat exchanger and a pressure reducing valve arranged between the heat exchanger and an evaporator, wherein after the forced circulation pump is used for increasing the high-concentration salt-containing wastewater, the increased high-concentration salt-containing wastewater is heated in the heat exchanger; the heating temperature of the high-concentration salt-containing wastewater is 105-119 ℃, the heating steam temperature is 115-125 ℃, and the temperature difference between the high-concentration salt-containing wastewater and the steam is 5-10 ℃. The temperature and pressure are matched to ensure that no new crystal salt is precipitated in the heat exchanger and the pipeline. After the pressure of the pressure reducing device is reduced, the high-concentration salt-containing wastewater enters the evaporator, the operating pressure is controlled at a lower level, the moisture is fully vaporized, the high-concentration salt-containing wastewater is evaporated and concentrated, and new crystal salt is continuously separated out.
Description
Technical Field
The invention relates to the technical field of concentration, in particular to an anti-fouling and self-cleaning MVR evaporation concentration system.
Background
MVR (mechanical vapor recompression) is a short-term mechanical vapor recompression technology, and is an energy-saving technology for reusing energy of secondary vapor generated by a system so as to reduce the requirement on external energy. The heated solution is evaporated in the evaporator to generate low-temperature steam, and the low-temperature steam is converted into heating steam after being pressurized by the steam compressor, so that the heating steam is continuously and circularly evaporated. The solution is concentrated by evaporation during the process. Except for starting, no steam is needed in the whole evaporation process, and the energy consumption is low.
High concentration salt-containing wastewater generally adopts the method of evaporative crystallization to handle, at first needs to concentrate waste water, generally adopts traditional reation kettle, single-effect evaporation, multiple-effect evaporation system, but these systems all have the problem that equipment is complicated, the energy consumption is big, and MVR technical structure is simple, and the advantage that the energy consumption is low has good application prospect in the aspect of the processing of high concentration salt-containing wastewater. However, in the process of evaporation and concentration, crystalline salt and dirt in the high-concentration saline wastewater are easy to deposit on the surface of an evaporator, the surface of a heat exchanger and the wall surface of a pipeline, so that the system is blocked or the evaporation efficiency is reduced, and particularly when objects with high pollutant concentrations, such as waste leachate membrane treatment concentrated water, special industrial waste liquid, shale gas fracturing fluid and the like, are treated, frequent shutdown and cleaning are needed, the operation period is shortened, and the energy consumption of the system and the workload of operation and maintenance are increased.
In order to alleviate the pollution blockage, a method of deep pretreatment is usually adopted for wastewater to be treated to remove pollutants such as hardness, organic matters and the like, and accordingly, the investment and the operation cost of pretreatment are increased.
Disclosure of Invention
Based on this, it is necessary to provide an MVR evaporation concentration system, and this system need not carry out the preliminary treatment to the pending waste water of higher concentration, and the system itself has anti-soil stifled function, and the maintenance work volume in the use is little, and the cycle of operation is long, and the reliability is high.
The invention aims to provide an anti-fouling and self-cleaning MVR evaporation and concentration system, which comprises a heat exchanger, a vapor compressor, an evaporator, a separator, a forced circulation pump and a pressure reducing valve, wherein the heat exchanger is provided with a vapor heat exchange channel and a feed liquid heat exchange channel; the liquid inlet of the forced circulation pump is connected with a feed liquid to be concentrated, the liquid outlet is connected with the inlet of a feed liquid heat exchange channel of the heat exchanger, the outlet of the feed liquid heat exchange channel of the heat exchanger is connected with the liquid inlet of the evaporator, and the liquid outlet of the evaporator is connected with the liquid inlet of the separator; the evaporator is also provided with a steam outlet, the steam outlet is connected with an air inlet of a steam compressor, and an air outlet of the steam compressor is connected with an inlet of a steam heat exchange channel of the heat exchanger; a pressure reducing valve is also arranged between the heat exchanger and the evaporator; the heat exchanger is communicated with the raw steam; a control system is also included for controlling the pressure and temperature in the system. The beneficial effects of this technical scheme do: one of the functions of the forced circulation pump is to increase the pressure of the feed liquid to be concentrated, namely the high-concentration salt-containing wastewater, and the pressure reducing valve is used for reducing the pressure of the high-concentration salt-containing wastewater. The waste water circulating system adopts step pressure control, the waste water is from the outlet of the forced circulation pump to the outlet of the heat exchanger, the operating pressure is controlled at a higher level, evaporation and vaporization can not occur at the operating temperature, and no new crystal salt is precipitated. After the pressure of the pressure reducing device is reduced, the high-concentration salt-containing wastewater enters the evaporator, the operating pressure is controlled at a lower level, the moisture is fully vaporized, the high-concentration salt-containing wastewater is evaporated and concentrated, and new crystal salt is continuously separated out.
Further, the separator is also provided with a mother liquor outlet, and the mother liquor outlet is connected with a liquid inlet of the forced circulation pump.
The mother liquor is waste water from which salts or a concentrated solution containing solid particles of crystallized salts are separated from the separator.
The mother liquor recycling improves the utilization rate of the high-concentration salt-containing wastewater.
The heat exchanger is a plate heat exchanger, the width between plates of the feed liquid heat exchange channel is 3-6 mm, and no contact exists between the plates.
The width between the plates of the feed liquid, namely the high-concentration salt-containing wastewater channel is 3-6 mm, the high-concentration salt-containing wastewater adopts a wide flow channel to flow freely, no contact exists between the heat exchange plates, the fluid flows in a high-speed turbulent manner, no dead angle exists, and the high-concentration salt-containing wastewater is not easy to block in the flow channel.
Furthermore, raised patterns are arranged on the surface of the heat exchange plate of the plate heat exchanger, and the pattern shape is selected from one or more of herringbone patterns, horizontal bar patterns, oblique bar corrugations and spherical patterns.
One or two of the oblique strip shape and the spherical corrugation are preferred.
The single heat exchange plate is provided with one or more shapes of corrugations to increase fluid disturbance, and crystals and dirt are not easy to deposit on the surface of the plate. The oblique strip-shaped corrugations and the spherical corrugations have larger disturbance on the fluid and better effect. The disturbance effect of the herringbone ripples and the horizontal strip ripples is not as good as that of the inclined ripples and the spherical ripples, but the disturbance effect of preventing crystals and dirt from being deposited can be better achieved when the flow speed is higher.
And the outlet of the preheater is communicated with the inlet of the forced circulation pump, and the condensed water outlet of the heat exchanger is communicated with the preheater.
The high-concentration salt-containing wastewater is preheated by the preheater and then pumped into the heat exchanger by the forced circulation pump, so that the temperature of the high-concentration salt-containing wastewater in the heat exchanger can be better controlled. The condensed water generated in the heat exchanger contains a certain amount of uncondensed steam, and the heat of the uncondensed steam can be reused in the preheater, so that the energy utilization rate of the system is improved.
Further, the separator is a thickener or centrifuge.
The thickener or the centrifuge has simple structure and low cost, and can play a better separation effect.
The invention also aims to provide a process for concentrating high-concentration salt-containing wastewater, which comprises the following steps:
the pressure of the high-concentration salt-containing wastewater is increased, and the pressure range is not less than 0.1MPa and not more than Ph≤0.5MPa；
Heating the boosted high-concentration salt-containing wastewater, wherein the heating temperature of the high-concentration salt-containing wastewater is 105-119 ℃, the temperature of a heating medium is 115-125 ℃, and the temperature difference between the high-concentration salt-containing wastewater and the heating medium is 5-10 ℃;
decompressing and pressing the heated high-concentration salt-containing wastewaterThe force range is-0.02 MPa or less and Pl＜0.035MPa；
Evaporating and concentrating the decompressed high-concentration salt-containing wastewater;
and separating the concentrated wastewater, and recovering the concentrated solution or salt containing the solid particles of the crystalline salt.
Further, the process for concentrating the high-concentration salt-containing wastewater by adopting the anti-fouling and self-cleaning MVR evaporation and concentration system comprises the following steps:
pressurizing the high-concentration salt-containing wastewater by using a forced circulation pump, wherein the pressure from the forced circulation pump to a pressure reducing valve section is not less than 0.1MPa and not more than Ph≤0.5MPa；
Heating the pressurized high-concentration salt-containing wastewater in a heat exchanger; the heating temperature of the high-concentration salt-containing wastewater is 105-119 ℃, the temperature of heating steam is 115-125 ℃, and the temperature difference between the high-concentration salt-containing wastewater and the steam is 5-10 ℃;
the pressure of the heated high-concentration salt-containing wastewater is reduced by a pressure reducing valve, and the pressure from the pressure reducing valve to the evaporator section is-0.02 MPa and is not more than Pl＜0.035MPa；
Concentrating the waste water in an evaporator;
and (4) separating the concentrated wastewater in a separator, and recovering concentrated solution or salt containing the solid particles of the crystalline salt.
The gradient pressure makes the salt in the waste water not easy to separate out in the heat exchanger and the pipeline, and the blockage is prevented.
The temperature difference of heat exchange between the strong brine and the mechanical compression steam of the heating medium is controlled to be 5-10 ℃, so that local overheating vaporization of the strong brine close to the heat exchange plate side can be prevented, and salt crystals are precipitated and deposited on the surface of the heat exchanger.
In some embodiments, the high-concentration salt-containing wastewater treated by the anti-fouling self-cleaning MVR evaporation concentration system is 26000-64400 mg/L of TDS and CODCr1583-5600 mg/L, 6-137 mg/L ammonia nitrogen, 139-2600 mg/L total nitrogen. .
After the high-concentration salt-containing wastewater is evaporated and concentrated by the system, crystalline salts appear in the forced circulation liquid, and the walls of the pipelines and the surfaces of the heat exchangers are washed when the crystalline salts flow in the pipelines, the heat exchangers and other equipment along with salt water, so that the system has a self-cleaning function.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Fig. 2 is an assembly view of a plate heat exchanger.
In the drawings, the components represented by the respective reference numerals are listed below:
the heat exchanger comprises a heat exchanger 1, a heat exchange plate 1-1, a steam compressor 2, an evaporator 3, a separator 4, a forced circulation pump 5, a pressure reducing valve 6 and a preheater 7.
Detailed Description
The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention.
Fig. 1 is a schematic structural diagram of the present invention, which includes a heat exchanger 1, a vapor compressor 2, an evaporator 3, a separator 4, a forced circulation pump 5 and a pressure reducing valve 6, wherein the heat exchanger 1 has a vapor heat exchange channel and a feed liquid heat exchange channel; the liquid inlet of the forced circulation pump 5 is connected with a feed liquid to be concentrated, the liquid outlet is connected with the inlet of a feed liquid heat exchange channel of the heat exchanger 1, the outlet of the feed liquid heat exchange channel of the heat exchanger 1 is connected with the liquid inlet of the evaporator 3, and the liquid outlet of the evaporator 3 is connected with the liquid inlet of the separator 4;
the evaporator 3 is also provided with a steam outlet, the steam outlet is connected with an air inlet of the steam compressor 2, and an air outlet of the steam compressor 2 is connected with an inlet of a steam heat exchange channel of the heat exchanger 1;
a pressure reducing valve 6 is also arranged between the heat exchanger 1 and the evaporator 3.
The forced circulation pump 5 can increase the pressure of the high-concentration salt-containing wastewater between the forced circulation pump 5 and the pressure reducing valve 6, and the pressure reducing valve 6 can reduce the pressure of the high-concentration salt-containing wastewater between the pressure reducing valve 6 and the evaporator 3. The separator 4 is a solid-liquid separation device in the prior art, and is a thickener or a centrifuge.
The heat exchanger 1 is a plate heat exchanger, the assembly drawing of which is shown in figure 2, the plate heat exchanger is formed by a plurality of sheets which are punched with corrugations, namely heat exchange sheets 1-1, according to a certain interval, the periphery of the sheets is sealed by gaskets, and the sheets are overlapped and compressed by a frame and a compression spiral, four corner holes of the sheets and the gaskets form a fluid distribution pipe and a fluid collection pipe, and simultaneously, cold and hot fluids are separated to flow in flow channels on two sides of each heat exchange sheet 1-1 respectively, and heat exchange is carried out through the heat exchange sheets 1-1. The distance between the plates of the heat exchange plate through which the high-concentration salt-containing wastewater flows is set to be 3-6 mm. The heat exchange plate has raised patterns on its surface, and the patterns shown in fig. 2 are oblique ribs. The raised patterns on the heat exchange plate can also be one or more of herringbone patterns, horizontal bar patterns, oblique bar patterns and spherical (tumor-shaped) patterns.
In the embodiment of the present invention, the control of the pressure and the temperature is performed by the prior art. If a pressure sensor is arranged between the forced circulation pump 5 and the heat exchanger 1, a temperature sensor is arranged in the heat exchanger, a temperature and pressure sensor is arranged at the outlet of the steam compressor 2, a temperature and pressure sensor is arranged in the evaporator 3, a central control system is arranged in the system, the pressure and temperature are controlled by the control system, the automatic pressure and temperature control technology is a mature prior art, and the specific structure and the connection mode are not repeated.
Example 1
The embodiment provides a process for concentrating high-concentration salt-containing wastewater by using an anti-fouling and self-cleaning MVR evaporation and concentration system, which comprises the following steps:
s1, the high-concentration salt-containing wastewater treated by the embodiment is reverse osmosis concentrated water of a landfill leachate treatment plant, and the wastewater indexes are detected, and the results are shown in Table 1.
S2, pressurizing the high-concentration salt-containing wastewater by using a forced circulation pump 5, wherein the pressure in the section from the forced circulation pump 5 to a pressure reducing valve 6 is 0.1 MPa.
S3, heating the pressurized high-concentration salt-containing wastewater in a plate heat exchanger, wherein the width between plates of a high-concentration salt-containing wastewater channel is 3mm, and the surface of a heat exchange plate is provided with oblique ripples; the temperature of the wastewater flowing through the high-concentration salt-containing wastewater channel in the plate heat exchanger is 105-110 ℃, the temperature of the steam is 115-120 ℃, and the temperature difference between the high-concentration salt-containing wastewater and the steam is 10 ℃.
S4, decompressing the heated high-concentration salt-containing wastewater through a decompression valve 6, wherein the pressure from the decompression valve 6 to the evaporator 3 section is 0.035 MPa.
S5, the waste water is concentrated in the evaporator 3.
S6, separating the concentrated wastewater in a separator 4, and recovering a concentrated solution containing the solid particles of the crystalline salt.
Example 2
The embodiment provides a process for concentrating high-concentration salt-containing wastewater by using an anti-fouling and self-cleaning MVR evaporation and concentration system.
S1, the high-concentration saline wastewater treated by the embodiment is NF-DTRO concentrated water of a waste incineration plant, and the wastewater indexes are detected, and the results are shown in Table 1.
S2, pressurizing the high-concentration salt-containing wastewater by using a forced circulation pump 5, wherein the pressure in the section from the forced circulation pump 5 to a pressure reducing valve 6 is 0.2 MPa;
s3, heating the pressurized high-concentration salt-containing wastewater in a plate heat exchanger, wherein the width between plates of a high-concentration salt-containing wastewater channel is 4mm, and the surface of a heat exchange plate is provided with oblique ripples; the temperature of the wastewater flowing through the high-concentration salt-containing wastewater channel in the plate heat exchanger is 106-119 ℃, the temperature of the steam is 115-125 ℃, and the temperature difference between the high-concentration salt-containing wastewater and the steam is 6 ℃.
S4, decompressing the heated high-concentration salt-containing wastewater through a decompression valve 6, wherein the pressure from the decompression valve 6 to the evaporator 3 section is 0.02 MPa;
s5, concentrating the waste water in the evaporator 3;
s6, separating the concentrated wastewater in a separator 4, and recovering a concentrated solution containing the solid particles of the crystalline salt.
Example 3
The embodiment provides a process for concentrating high-concentration salt-containing wastewater by using an anti-fouling and self-cleaning MVR evaporation and concentration system.
S1, the high-concentration salt-containing wastewater treated by the embodiment is dual-membrane-treated concentrated water of shale gas produced water, and wastewater indexes of the high-concentration salt-containing wastewater are detected and shown in Table 1.
S2, pressurizing the high-concentration salt-containing wastewater by using a forced circulation pump 5, wherein the pressure in the section from the forced circulation pump 5 to a pressure reducing valve 6 is 0.5 MPa;
s3, heating the pressurized high-concentration salt-containing wastewater in a plate heat exchanger 1, wherein the width between plates of a high-concentration salt-containing wastewater channel in the heat exchanger 1 is 6mm, and the surface of a heat exchange plate is provided with spherical ripples; the temperature of the wastewater flowing through the high-concentration salt-containing wastewater channel in the plate heat exchanger is 115-119 ℃, the temperature of the steam is 120-124 ℃, and the temperature difference between the high-concentration salt-containing wastewater and the steam is 5 ℃.
S4, decompressing the heated high-concentration salt-containing wastewater through a decompression valve 6, wherein the pressure from the decompression valve 6 to the evaporator 3 section is-0.02 MPa;
s5, concentrating the waste water in the evaporator 3;
s6, separating the concentrated wastewater in a separator 4, and recovering a concentrated solution containing the solid particles of the crystalline salt.
Comparative example 1
The comparative example provides a process for concentrating high-concentration salt-containing wastewater by using the anti-fouling and self-cleaning MVR evaporation and concentration system.
The same procedure as in example 3 was repeated to obtain wastewater having a high salt concentration, and the detection indexes of the wastewater are shown in Table 1.
S1, pressurizing the high-concentration salt-containing wastewater by using a forced circulation pump 5, wherein the pressure in the section from the forced circulation pump 5 to a pressure reducing valve 6 is 0.08 MPa;
s2, heating the pressurized high-concentration salt-containing wastewater in a plate heat exchanger 1, wherein the width between plates of a high-concentration salt-containing wastewater channel in the heat exchanger 1 is 6mm, and the surface of a heat exchange plate is provided with spherical ripples; the temperature of the wastewater flowing through the high-concentration salt-containing wastewater channel in the plate heat exchanger is 100-105 ℃, the temperature of the steam is 115-120 ℃, and the temperature difference between the high-concentration salt-containing wastewater and the steam is 15 ℃.
S3, decompressing the heated high-concentration salt-containing wastewater through a decompression valve 6, wherein the pressure from the decompression valve 6 to the evaporator 3 section is 0.08 MPa;
s4, concentrating the waste water in the evaporator 3;
s5, separating the concentrated wastewater in a separator 4, and recovering a concentrated solution containing the solid particles of the crystalline salt.
Comparative example 2
The comparative example provides a process for concentrating high-concentration salt-containing wastewater.
The same procedure as in example 3 was repeated to obtain wastewater having a high salt concentration, and the detection indexes of the wastewater are shown in Table 1.
S1, pressurizing the high-concentration salt-containing wastewater by using a forced circulation pump 5, wherein the pressure in the section from the forced circulation pump 5 to a pressure reducing valve 6 is 0.5 MPa.
S2, heating the pressurized high-concentration salt-containing wastewater in a plate heat exchanger, wherein the width between plates provided with high-concentration salt-containing wastewater channels is 1mm, and raised patterns are not arranged on the surface of a heat exchange plate; the temperature of the wastewater flowing through the high-concentration salt-containing wastewater channel in the plate heat exchanger is 115-119 ℃, the temperature of the steam is 120-124 ℃, and the temperature difference between the high-concentration salt-containing wastewater and the steam is 5 ℃.
S3, decompressing the heated high-concentration salt-containing wastewater through a decompression valve 6, wherein the pressure from the decompression valve 6 to the evaporator 3 section is-0.02 MPa;
s4, concentrating the waste water in the evaporator 3;
s5, separating the concentrated wastewater in a separator 4, and recovering a concentrated solution containing the solid particles of the crystalline salt.
TABLE 1 wastewater and treatment Process parameters
TDS in the table is total dissolved solids, CODCrChemical oxygen consumption measured by a potassium dichromate method.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A stain-resistant blocking-resistant self-cleaning MVR evaporation concentration system is characterized by comprising a heat exchanger (1), a vapor compressor (2), an evaporator (3), a separator (4), a forced circulation pump (5) and a pressure reducing valve (6), wherein the heat exchanger (1) is provided with a vapor heat exchange channel and a feed liquid heat exchange channel; the liquid inlet of the forced circulation pump (5) is connected with a to-be-concentrated liquid, the liquid outlet is connected with the inlet of a liquid-liquid heat exchange channel of the heat exchanger (1), the outlet of the liquid-liquid heat exchange channel of the heat exchanger (1) is connected with the liquid inlet of the evaporator (3), and the liquid outlet of the evaporator (3) is connected with the liquid inlet of the separator (4);
the evaporator (3) is also provided with a steam outlet, the steam outlet is connected with an air inlet of the steam compressor (2), and an air outlet of the steam compressor (2) is connected with an inlet of a steam heat exchange channel of the heat exchanger (1);
a pressure reducing valve (6) is also arranged between the heat exchanger (1) and the evaporator (3);
the heat exchanger (1) is communicated with the raw steam;
a control system is also included for controlling the pressure and temperature in the system.
2. The anti-fouling self-cleaning MVR evaporation and concentration system according to claim 1, wherein the separator (4) is further provided with a mother liquor outlet, and the mother liquor outlet is connected with a liquid inlet of the forced circulation pump (5).
3. The anti-fouling and self-cleaning MVR evaporation and concentration system according to claim 1, wherein the heat exchanger (1) is a plate heat exchanger, the width between plates of the feed liquid heat exchange channel is 3-6 mm, and no contact exists between the plates.
4. The anti-fouling self-cleaning MVR evaporation and concentration system according to claim 2, wherein the surface of the heat exchange plate of the plate heat exchanger is provided with raised patterns, and the pattern shape is selected from one or more of herringbone patterns, horizontal bar patterns, oblique bar waves and spherical patterns.
5. The anti-fouling self-cleaning MVR evaporation and concentration system according to claim 4, wherein the heat exchange plate surface of the plate heat exchanger is one or two of slanted strip corrugation and spherical patterns.
6. The anti-fouling and self-cleaning MVR evaporation and concentration system according to any one of claims 1 to 5, further comprising a preheater (7), wherein an outlet of the preheater (7) is communicated with an inlet of the forced circulation pump (5), the heat exchanger (1) is further provided with a condensed water outlet, and the condensed water outlet is communicated with the preheater (7).
7. The anti-fouling self-cleaning MVR evaporation and concentration system according to any one of claims 1 to 5, wherein the separator (4) is a thickener or a centrifuge.
8. A high-concentration salt-containing wastewater concentration process is characterized by comprising the following steps:
the pressure of the high-concentration salt-containing wastewater is increased, and the pressure range is not less than 0.1MPa and not more than Ph≤0.5MPa；
Heating the boosted high-concentration salt-containing wastewater, wherein the heating temperature of the high-concentration salt-containing wastewater is 105-119 ℃, the temperature of a heating medium is 115-125 ℃, and the temperature difference between the high-concentration salt-containing wastewater and the heating medium is 5-10 ℃;
decompressing the heated high-concentration salt-containing wastewater, wherein the pressure range is-0.02 MPa and is not more than Pl＜0.035MPa；
Evaporating and concentrating the decompressed high-concentration salt-containing wastewater;
and separating the concentrated wastewater, and recovering the concentrated solution or salt containing the solid particles of the crystalline salt.
9. The concentration process of high-concentration salt-containing wastewater according to claim 8, wherein the concentration is performed by using the anti-fouling and self-cleaning MVR evaporation concentration system according to any one of claims 1 to 7, and the concentration process comprises the following steps:
pressurizing the high-concentration salt-containing wastewater by using a forced circulation pump (5), wherein the pressure in the section from the forced circulation pump (5) to a pressure reducing valve (6) is not less than 0.1MPa and not more than Ph≤0.5MPa；
Heating the pressurized high-concentration salt-containing wastewater in a heat exchanger (1); the heating temperature of the high-concentration salt-containing wastewater is 105-119 ℃, the temperature of heating steam is 115-125 ℃, and the temperature difference between the high-concentration salt-containing wastewater and the steam is 5-10 ℃;
the pressure of the heated high-concentration salt-containing wastewater is reduced by a pressure reducing valve (6), and the pressure from the pressure reducing valve (6) to the evaporator (3) is-0.02 MPa and is not more than Pl＜0.035MPa；
The waste water is concentrated in an evaporator (3);
the concentrated waste water enters a separator (4) for separation, and concentrated solution or salt containing solid particles of the crystal salt is recovered.
10. The concentration process of the high-concentration salt-containing wastewater according to claim 8 or 9, wherein the TDS of the high-concentration salt-containing wastewater is 26000-64400 mg/L, and the COD of the high-concentration salt-containing wastewater is CODCr1583-5600 mg/L, 6-137 mg/L ammonia nitrogen, 139-2600 mg/L total nitrogen.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114344928A (en) * | 2022-01-05 | 2022-04-15 | 淄博鲁华泓锦新材料集团股份有限公司 | Low-temperature concentration evaporation method of isoprene latex capable of preventing skinning and coalescence |
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| CN114344928A (en) * | 2022-01-05 | 2022-04-15 | 淄博鲁华泓锦新材料集团股份有限公司 | Low-temperature concentration evaporation method of isoprene latex capable of preventing skinning and coalescence |
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