CN209923113U - Processing system of evaporation crystallization mother liquor - Google Patents
Processing system of evaporation crystallization mother liquor Download PDFInfo
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- CN209923113U CN209923113U CN201920271207.0U CN201920271207U CN209923113U CN 209923113 U CN209923113 U CN 209923113U CN 201920271207 U CN201920271207 U CN 201920271207U CN 209923113 U CN209923113 U CN 209923113U
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- 239000012452 mother liquor Substances 0.000 title claims abstract description 90
- 238000002425 crystallisation Methods 0.000 title claims abstract description 50
- 230000008025 crystallization Effects 0.000 title claims abstract description 50
- 238000001704 evaporation Methods 0.000 title claims abstract description 39
- 230000008020 evaporation Effects 0.000 title claims abstract description 35
- 238000012545 processing Methods 0.000 title claims abstract description 13
- 239000011347 resin Substances 0.000 claims abstract description 204
- 229920005989 resin Polymers 0.000 claims abstract description 204
- 239000007788 liquid Substances 0.000 claims abstract description 156
- 239000005416 organic matter Substances 0.000 claims abstract description 131
- 238000001179 sorption measurement Methods 0.000 claims abstract description 97
- 238000000926 separation method Methods 0.000 claims abstract description 49
- 150000003839 salts Chemical class 0.000 claims abstract description 26
- 238000011033 desalting Methods 0.000 claims abstract description 23
- 239000002957 persistent organic pollutant Substances 0.000 claims abstract description 13
- 238000004140 cleaning Methods 0.000 claims description 93
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 55
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- 238000010438 heat treatment Methods 0.000 claims description 32
- 238000003860 storage Methods 0.000 claims description 27
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- 230000008929 regeneration Effects 0.000 claims description 9
- 238000011069 regeneration method Methods 0.000 claims description 9
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- 238000007599 discharging Methods 0.000 claims description 3
- 230000009467 reduction Effects 0.000 claims description 3
- 230000002745 absorbent Effects 0.000 abstract description 2
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- 238000010521 absorption reaction Methods 0.000 abstract description 2
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- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 21
- 238000000034 method Methods 0.000 description 11
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- 235000017491 Bambusa tulda Nutrition 0.000 description 3
- 241001330002 Bambuseae Species 0.000 description 3
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 3
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 3
- 239000011425 bamboo Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 3
- 239000011368 organic material Substances 0.000 description 3
- 241000196324 Embryophyta Species 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 239000000356 contaminant Substances 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- XSTXAVWGXDQKEL-UHFFFAOYSA-N Trichloroethylene Chemical group ClC=C(Cl)Cl XSTXAVWGXDQKEL-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
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- UBOXGVDOUJQMTN-UHFFFAOYSA-N trichloroethylene Natural products ClCC(Cl)Cl UBOXGVDOUJQMTN-UHFFFAOYSA-N 0.000 description 1
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Abstract
The embodiment of the utility model provides a processing system of evaporation crystallization mother liquor, the system includes: the system comprises an evaporation crystallizer, a heat exchanger, a desalting filter, an organic matter adsorption device and an organic matter separation tower; and a solid-liquid separator is arranged in the evaporative crystallizer. The utility model provides a system is through external organic matter adsorption equipment on prior art's basis, utilizes the organic matter in the absorbent resin absorption mother liquor in the organic matter adsorption equipment, has realized getting rid of the purpose of organic pollutant in the evaporation crystallization mother liquor when not influencing the evaporative crystallizer normal operating to make the crystallization salt purity of separation and purification up to standard.
Description
Technical Field
The utility model relates to a waste water treatment technical field especially relates to a processing system of evaporation crystallization mother liquor.
Background
With the continuous development of the industry, the shortage of water resources and the insufficient water environment capacity become important bottlenecks restricting the development of modern industry. Among them, the treatment and discharge of industrial wastewater become a major problem in the development of various industries. Because industrial wastewater contains various substances, the treatment of the industrial wastewater faces huge challenges; meanwhile, the production method has wide production ways and the yield is increased year by year, thereby bringing huge environmental and economic pressure. Therefore, the industrial wastewater zero discharge technology becomes the key point of environmental protection research.
The industrial wastewater zero emission technology is one of important ways for breaking the contradiction between industrial development and water resources, wherein the evaporative crystallization technology is mainly used for evaporating and crystallizing the industrial wastewater with high salt concentration to generate miscellaneous salt through means such as machinery and steam, so that the zero emission and the recycling of the industrial wastewater are basically realized. However, due to the presence of organic contaminants in the mother liquor of evaporative crystallization, the generated miscellaneous salts are still dangerous wastes with serious hidden troubles and high treatment cost.
However, because the evaporation crystallization mother liquor has high temperature and high salt concentration, the traditional methods for removing organic pollutants, such as chemical precipitation, coagulating sedimentation, multi-medium filtration, advanced oxidation and the like, are not suitable; meanwhile, although the existing membrane separation technology combined with the evaporative crystallization technology can separate part of the miscellaneous salt from the mother liquor, the purity of the separated crystalline salt is not high due to the limitation of the membrane technology and the enrichment of organic pollutants, and the requirement of industrial salt cannot be met.
Therefore, how to effectively remove the organic contaminants in the mother liquor of evaporative crystallization is a problem to be solved by those skilled in the art.
SUMMERY OF THE UTILITY MODEL
An object of the embodiment of the utility model is to provide a processing system of evaporation crystallization mother liquor for get rid of the organic pollutant in the evaporation crystallization mother liquor. The specific technical scheme is as follows:
the utility model provides a processing system of evaporative crystallization mother liquor, which comprises an evaporative crystallizer, a heat exchanger, a desalting filter, an organic matter adsorption device and an organic matter separation tower;
a water outlet pipe is arranged at the position of the evaporative crystallizer, which is 1/4-1/3 away from the bottom, and the water inlet end of the water outlet pipe penetrates through the side wall of the evaporative crystallizer and is arranged in the evaporative crystallizer;
a solid-liquid separator is arranged in the evaporative crystallizer, and a water outlet of the solid-liquid separator is connected with a water inlet end of the water outlet pipe; the solid-liquid separator is used for separating crystallized salt in evaporative crystallization mother liquor to be discharged from a water outlet pipe of the evaporative crystallizer;
the water outlet end of the water outlet pipe of the evaporative crystallizer is communicated with a hot fluid inlet of the heat exchanger; a hot fluid outlet of the heat exchanger is communicated with an inlet of the desalting filter through a pipeline; the desalting filter is used for filtering out crystallized salt in the mother liquor subjected to heat exchange and temperature reduction by the heat exchanger; a cold fluid inlet of the heat exchanger is communicated with a waste water conveying pipeline to be evaporated; a cold fluid outlet of the heat exchanger is communicated with a water inlet of the evaporative crystallizer through a pipeline;
the organic matter adsorption device is provided with a mother liquid inlet, a mother liquid outlet, a resin cleaning liquid inlet and a resin cleaning waste liquid outlet, and the mother liquid inlet of the organic matter adsorption device is communicated with the outlet of the desalting filter through a pipeline; a mother liquid outlet of the organic matter adsorption device is communicated with the waste water conveying pipeline to be evaporated through a pipeline;
the organic matter separation tower is provided with a resin cleaning waste liquid inlet and a resin cleaning liquid outlet; a resin cleaning waste liquid inlet of the organic matter separation tower is communicated with a resin cleaning waste liquid outlet of the organic matter adsorption device through a pipeline; the resin cleaning liquid outlet of the organic matter separation tower is communicated with the resin cleaning liquid inlet of the organic matter adsorption device through a pipeline;
at least one working resin column and at least one regeneration resin column which are connected in parallel are arranged in the organic matter adsorption device; each resin column is provided with an inlet and an outlet;
the inlet of each resin column is respectively communicated with a mother liquor inlet of the organic matter adsorption device through a pipeline, and the inlet of each resin column is respectively communicated with a resin cleaning solution inlet of the organic matter adsorption device through a pipeline; the outlet of each resin column is respectively communicated with a mother liquor outlet of the organic matter adsorption device through a pipeline, and the outlet of each resin column is respectively communicated with a resin cleaning waste liquor outlet of the organic matter adsorption device through a pipeline;
a first valve is arranged on a pipeline between the inlet of each resin column and the mother liquid inlet of the organic matter adsorption device; a second valve is arranged on a pipeline between the outlet of each resin column and the mother liquor outlet of the organic matter adsorption device; a third valve is arranged on a pipeline between the inlet of each resin column and the resin cleaning liquid inlet of the organic matter adsorption device; a fourth valve is arranged on a pipeline between the outlet of each resin column and the resin cleaning waste liquid outlet of the organic matter adsorption device;
the upper part of the organic matter separation tower is provided with a liquid storage area, and the lower part of the organic matter separation tower is provided with a heating area; a heater is arranged in the heating zone and used for heating the resin cleaning waste liquid in the heating zone to gasify the resin cleaning liquid in the resin cleaning waste liquid; a condenser is arranged in the liquid storage area of the organic matter separation tower and is used for condensing the gasified resin cleaning liquid into liquid; the condensed resin cleaning liquid flows back to the liquid storage area;
the bottom of the organic matter separation tower is provided with an organic pollutant discharge port for discharging residual waste liquid after heating and evaporation in a heating zone.
In some embodiments of the present invention, a circulation pump is disposed on the outlet pipe outside the evaporative crystallizer.
In some embodiments of the present invention, the mother liquor outlet of the organic material adsorption device and the pipeline between the wastewater delivery pipelines to be evaporated are provided with check valves.
In some embodiments of the present invention, a resin cleaning pump is disposed on the pipeline between the resin cleaning liquid outlet of the organic matter separation tower and the resin cleaning liquid inlet of the organic matter adsorbing device.
In some embodiments of the present invention, a working resin column and a regeneration resin column connected in parallel are disposed inside the organic substance adsorbing device.
In some embodiments of the present invention, the heat exchanger is a plate heat exchanger.
In some embodiments of the invention, the heater is an electric heater.
The utility model discloses an in some embodiments, still be equipped with the sight glass on the stock solution district lateral wall of organic matter knockout tower, the sight glass with the condenser is installed on same water flat line.
The embodiment of the utility model provides a processing system of evaporation crystallization mother liquor, external organic matter adsorption equipment on prior art utilizes the organic matter in the absorbent resin absorption mother liquor in the organic matter adsorption equipment, has realized getting rid of the purpose of organic pollutant in the evaporation crystallization mother liquor when not influencing the normal operating of evaporation crystallizer to make the crystal salt purity of separation purification up to standard; in addition, the device is provided with an organic matter separation tower, the resin cleaning solution stored in the organic matter separation tower can regenerate the adsorption resin in the organic matter adsorption device, and meanwhile, the heater and the condenser arranged in the organic matter separation tower can also regenerate the resin cleaning solution after the resin cleaning solution cleans the adsorption resin and is evaporated and condensed, so that the wastewater treatment cost is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic view of a system for processing mother liquor of evaporative crystallization according to an embodiment of the present invention;
FIG. 2 is a schematic structural view of a filter screen type solid-liquid separator;
FIG. 3 is a schematic structural view of a bamboo hat type solid-liquid separator;
FIG. 4 is a schematic structural view of a swash plate type solid-liquid separator;
wherein, 1-an evaporative crystallizer; 2-a solid-liquid separator; 3-a circulating pump; 4-a heat exchanger; 5-desalting filter; 6-an organic matter adsorption device; 7-resin column; 8-resin purge pump; 9-an organic matter separation column; 10-a condenser; 11-a liquid storage area; 12-a heater; 13-a heating zone; 14-organic pollutant discharge port; 15-a check valve; 16-a pipeline for conveying the waste liquid to be evaporated; 17-a first valve; 18-a second valve; 19-a third valve; 20-fourth valve.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
The utility model provides a processing system of evaporation crystallization mother liquor, as shown in figure 1, include: the system comprises an evaporative crystallizer 1, a heat exchanger 4, a desalting filter 5, an organic matter adsorption device 6 and an organic matter separation tower 9.
A water outlet pipe is arranged at the position of the evaporative crystallizer 1, which is 1/4-1/3 away from the bottom, and the water inlet end of the water outlet pipe penetrates through the side wall of the evaporative crystallizer 1 and is arranged in the evaporative crystallizer 1; a solid-liquid separator 2 is arranged in the evaporative crystallizer 1, and a water outlet of the solid-liquid separator 2 is connected with a water inlet end of the water outlet pipe; the solid-liquid separator 2 is used for separating the crystallized salt in the evaporative crystallization mother liquor to be discharged from the water outlet pipe of the evaporative crystallizer 1, and the crystallized salt is ensured to be retained in the evaporative crystallizer 1, so that the damage of the deposition of the crystallized salt to a system device is reduced.
In some embodiments of the present invention, the solid-liquid separator 2 may be a filter screen type solid-liquid separator, as shown in fig. 2, a filter element is fixed inside the solid-liquid separator 2, the evaporation crystallization mother liquor to be discharged from the water outlet pipe of the evaporation crystallizer 1 enters the water outlet pipe through the filter element, and the crystallization salt in the mother liquor cannot pass through the filter element, so as to achieve the purpose of filtering the crystallization salt in the evaporation crystallization mother liquor;
in some embodiments of the present invention, the solid-liquid separator 2 may be a bamboo hat type solid-liquid separator, as shown in fig. 3, a plurality of bamboo hat type inclined plates which are mutually overlapped are fixed inside the solid-liquid separator 2, the evaporative crystallization mother liquor to be discharged from the water outlet pipe of the evaporative crystallizer 1 enters the water outlet pipe through the gaps between the inclined plates, and the crystallized salt in the mother liquor is intercepted at the lower side of the inclined plates or is settled at the upper side of the inclined plates and then cannot enter the water outlet pipe along the inclined plates, thereby achieving the purpose of filtering the crystallized salt in the evaporative crystallization mother liquor;
in some embodiments of the present invention, the solid-liquid separator 2 may be a swash plate type solid-liquid separator, as shown in fig. 4, a plurality of swash plates parallel to each other are fixed inside the solid-liquid separator 2, the evaporation crystallization mother liquor to be discharged from the outlet pipe of the evaporation crystallizer 1 enters the outlet pipe through the gap between the swash plates, and the crystallization salt in the mother liquor is intercepted at the lower side of the swash plate or settled at the upper side of the swash plate and then cannot enter the outlet pipe after being scratched by the swash plate, thereby achieving the purpose of filtering the crystallization salt in the evaporation crystallization mother liquor;
it should be noted that, because the evaporation crystallization mother liquor has a higher temperature and contains corrosive substances, a person skilled in the art needs to select a material having high temperature resistance and corrosion resistance from the existing filter element material or inclined plate material, so as to implement the technical scheme of the present invention.
In the specific implementation process, the solid-liquid separator 2 may be selected from any one of those shown in fig. 2 to 4 to achieve the purpose of separating the crystallized salt in the evaporative crystallization mother liquor to be discharged from the water outlet pipe of the evaporative crystallizer 1, which is not limited herein.
The water outlet end of the water outlet pipe of the evaporative crystallizer 1 is communicated with the hot fluid inlet of the heat exchanger 4; the hot fluid outlet of the heat exchanger 4 is communicated with the inlet of the desalting filter 5 through a pipeline; the desalting filter 5 is used for filtering out crystallized salt in the mother liquor subjected to heat exchange and temperature reduction by the heat exchanger 4; a cold fluid inlet of the heat exchanger 4 is communicated with a waste water conveying pipeline 16 to be evaporated; the to-be-evaporated wastewater conveying pipeline 16 is used for conveying wastewater which needs to enter the evaporative crystallizer 1 for evaporative crystallization treatment; and a cold fluid outlet of the heat exchanger 4 is communicated with a water inlet of the evaporative crystallizer 1 through a pipeline.
In some embodiments of the present invention, the desalination filter 5 is selected from one of a self-cleaning filter, a multi-media filter, and a cartridge filter; the choice of which filter is used to filter the mother liquor flowing out of the hot fluid outlet of the heat exchanger 4 can be chosen by the person skilled in the art according to the specific circumstances.
The organic matter adsorption device 6 is provided with a mother liquor inlet, a mother liquor outlet, a resin cleaning liquid inlet and a resin cleaning waste liquid outlet, and the mother liquor inlet of the organic matter adsorption device 6 is communicated with the outlet of the desalting filter 5 through a pipeline; a mother liquor outlet of the organic matter adsorption device 6 is communicated with the waste water conveying pipeline 16 to be evaporated through a pipeline;
a resin cleaning waste liquid inlet of the organic matter separation tower 9 is communicated with a resin cleaning waste liquid outlet of the organic matter adsorption device 6 through a pipeline; the resin cleaning liquid outlet of the organic matter separation tower 9 is communicated with the resin cleaning liquid inlet of the organic matter adsorption device 6 through a pipeline;
at least one working resin column and at least one regeneration resin column which are connected in parallel are arranged in the organic matter adsorption device 6; each resin column 7 is provided with an inlet and an outlet, and adsorption resin is filled in each resin column 7 and is used for adsorbing organic pollutants in the mother liquor;
in the technical scheme of the utility model, the heat exchanger 4 exchanges heat between the waste water to be evaporated and crystallized with low temperature and the mother liquor flowing out from the mother liquor outlet of the organic matter adsorption device 6 and the outlet water of the evaporation crystallizer 1 with high temperature, thus not only avoiding the influence of the high-temperature outlet water of the evaporation crystallizer 1 on the adsorption resin in the resin column 7, but also heating up and preheating the inlet water of the evaporation crystallizer 1, thereby saving energy consumption;
the inlet of each resin column 7 is respectively communicated with the mother liquor inlet of the organic matter adsorption device 6 through a pipeline, and the inlet of each resin column 7 is respectively communicated with the resin cleaning solution inlet of the organic matter adsorption device 6 through a pipeline; the outlet of each resin column 7 is respectively communicated with the mother liquor outlet of the organic matter adsorption device 6 through a pipeline, and the outlet of each resin column 7 is respectively communicated with the resin cleaning waste liquor outlet of the organic matter adsorption device 6 through a pipeline;
a first valve 17 is arranged on a pipeline between the inlet of each resin column 7 and the mother liquor inlet of the organic matter adsorption device 6; a second valve 18 is arranged on a pipeline between the outlet of each resin column 7 and the mother liquor outlet of the organic matter adsorption device 6; a third valve 19 is arranged on a pipeline between the inlet of each resin column 7 and the resin cleaning liquid inlet of the organic matter adsorption device 6; a fourth valve 20 is arranged on a pipeline between the outlet of each resin column 7 and the resin cleaning waste liquid outlet of the organic matter adsorption device 6;
the upper part of the organic matter separation tower 9 is provided with a liquid storage area 11, and the lower part is provided with a heating area 13; the resin cleaning liquid outlet of the organic matter separation tower 9 is positioned in the liquid storage area 11, and the resin cleaning waste liquid inlet is positioned in the heating area 13; a heater 12 is arranged in the heating zone 13 and is used for heating the resin cleaning waste liquid in the heating zone 13 to gasify the resin cleaning liquid in the resin cleaning waste liquid, and the residual waste liquid after heating and evaporation is temporarily stored in the heating zone 13 to be discharged; the liquid storage area 11 of the organic matter separation tower 9 is used for storing resin cleaning liquid, and a condenser 10 is arranged in the liquid storage area and is used for condensing gasified resin cleaning liquid into liquid; the condensed resin cleaning liquid flows back to the liquid storage area 11;
the bottom of the organic matter separation tower 9 is provided with an organic pollutant discharge port 14 for discharging the waste liquid remained after heating and evaporation in the heating zone 13.
In some embodiments of the present invention, a viewing mirror (not shown in the figure) is further disposed on the side wall of the liquid storage area 11 of the organic matter separation tower 9, and the viewing mirror and the condenser 10 are installed on the same horizontal line for observing the working state of the condenser 10 from the outside of the organic matter separation tower 9.
In some embodiments of the present invention, a circulation pump 3 is disposed on the water outlet pipe outside the evaporative crystallizer 1, for pumping the water outlet of the evaporative crystallizer 1 into the heat exchanger 4.
In some embodiments of the present invention, the mother liquor outlet of the organic material adsorbing device 6 and the pipeline between the waste water conveying pipelines 16 to be evaporated are provided with a check valve 15 for preventing the waste water to be evaporated and crystallized in the waste water conveying pipelines 16 to be evaporated from entering the organic material adsorbing device 6.
In some embodiments of the present invention, the resin cleaning liquid outlet of the organic matter separating tower 9 and the resin cleaning liquid inlet of the organic matter adsorbing device 6 are provided with a resin cleaning pump 8 on the pipeline for pumping the resin cleaning liquid in the liquid storage area 11 of the organic matter separating tower 9 into the regenerated resin column of the organic matter adsorbing device 6.
In some embodiments of the present invention, a working resin column and a regeneration resin column connected in parallel are disposed inside the organic substance adsorbing device 6.
In some embodiments of the present invention, the heat exchanger 4 is a plate heat exchanger.
In some embodiments of the present invention, the heater 12 is an electric heater.
By adopting the embodiments of the utility model to treat the evaporative crystallization mother liquor, the waste water to be evaporated and crystallized enters the waste liquid conveying pipeline 16 to be evaporated and enters the evaporative crystallizer 1 through the heat exchanger 4; the generated evaporative crystallization mother liquor is filtered by the solid-liquid separator 2 and then discharged out of the evaporative crystallizer 1, and then flows through the heat exchanger 4 and the desalting filter 5 in sequence; the mother liquor passing through the desalting filter 5 enters a working resin column of the organic matter adsorption device 6, a first valve 17 and a second valve 18 corresponding to the working resin column are opened, and a third valve 19 and a fourth valve 20 are closed; the mother liquor treated by the working resin column flows back to the evaporative crystallizer 1 through the heat exchanger 4 again.
When the adsorption capacity of the adsorption resin in the working resin column on the organic matters in the mother liquor reaches a saturated state, closing a first valve 17 and a second valve 18 corresponding to the working resin column, and opening a third valve 19 and a fourth valve 20 corresponding to the working resin column; and the first valve 17 and the second valve 18 of the regenerated resin column are opened, and the third valve 19 and the fourth valve 20 of the regenerated resin column are closed, so that the switching between the working resin column and the regenerated resin column is realized;
the mother liquor passing through the desalting filter 5 enters a switched working resin column;
the resin cleaning liquid in the liquid storage area 11 of the organic matter separation tower 9 enters the switched regenerated resin column, so that the adsorption resin in the resin cleaning column is regenerated after being cleaned;
when the regeneration of the adsorption resin in the regenerated resin column is finished, closing the third valve 19 and the fourth valve 20 corresponding to the regenerated resin column;
and when the adsorption capacity of the adsorption resin in the working resin column to be switched on the organic matters in the mother liquor reaches a saturated state, closing the first valve 17 and the second valve 18 corresponding to the working resin column after switching, opening the third valve 19 and the fourth valve 20 corresponding to the working resin column after switching, and opening the first valve 17 and the second valve 18 corresponding to the regenerated resin column after switching so as to realize the re-switching of the working resin after switching and the regenerated resin after switching.
It should be noted that the resin cleaning waste liquid generated after the resin cleaning liquid cleans the adsorption resin flows out from the resin cleaning waste liquid outlet of the organic matter adsorption device 6, and then enters the heating zone 13 of the organic matter separation tower 9 through a pipeline; evaporating the resin cleaning liquid in the resin cleaning waste liquid under the action of the heater 12, wherein the resin cleaning liquid steam rises to the liquid storage area 11 and is condensed into liquid after meeting the condenser 10 and flows into the liquid storage area 11; when no more condensed liquid drops are generated in the condenser 10 as observed through the sight glass of the liquid storage region 11, the waste liquid remaining after the heating evaporation in the heating region 13 can be discharged from the organic pollutant discharge port 14.
In some embodiments of the present invention, the resin cleaning solution is selected from any one or more of methanol, ethanol, trichloroethylene, benzene, and hexane.
The following describes the method for processing the mother liquor of evaporative crystallization according to the present invention by using the system for processing the mother liquor of evaporative crystallization according to the present invention.
Example 1
The processing system of the evaporation crystallization mother liquor is used, as shown in figure 1, and comprises:
the system comprises an evaporative crystallizer 1, a heat exchanger 4, a desalting filter 5, an organic matter adsorption device 6 and an organic matter separation tower 9.
A water outlet pipe is arranged at the position of the evaporative crystallizer 1, which is 1/4-1/3 away from the bottom, and the water inlet end of the water outlet pipe penetrates through the side wall of the evaporative crystallizer 1 and is arranged in the evaporative crystallizer 1; a solid-liquid separator 2 is arranged in the evaporative crystallizer 1, and a water outlet of the solid-liquid separator 2 is connected with a water inlet end of the water outlet pipe;
the water outlet end of the water outlet pipe of the evaporative crystallizer 1 is communicated with the hot fluid inlet of the heat exchanger 4; the hot fluid outlet of the heat exchanger 4 is communicated with the inlet of the desalting filter 5 through a pipeline; a cold fluid inlet of the heat exchanger 4 is communicated with a waste water conveying pipeline 16 to be evaporated; and a cold fluid outlet of the heat exchanger 4 is communicated with a water inlet of the evaporative crystallizer 1 through a pipeline.
The organic matter adsorption device 6 is provided with a mother liquor inlet, a mother liquor outlet, a resin cleaning liquid inlet and a resin cleaning waste liquid outlet, and the mother liquor inlet of the organic matter adsorption device 6 is communicated with the outlet of the desalting filter 5 through a pipeline; a mother liquor outlet of the organic matter adsorption device 6 is communicated with a cold fluid inlet of the heat exchanger 4 through a pipeline;
a working resin column and a regeneration resin column which are connected in parallel are arranged in the organic matter adsorption device 6; each resin column 7 is provided with an inlet and an outlet, and the inside of each resin column 7 is filled with adsorption resin;
the inlet of each resin column 7 is respectively communicated with the mother liquor inlet of the organic matter adsorption device 6 through a pipeline, and the inlet of each resin column 7 is respectively communicated with the resin cleaning solution inlet of the organic matter adsorption device 6 through a pipeline; the outlet of each resin column 7 is respectively communicated with the mother liquor outlet of the organic matter adsorption device 6 through a pipeline, and the outlet of each resin column 7 is respectively communicated with the resin cleaning waste liquor outlet of the organic matter adsorption device 6 through a pipeline;
a first valve 17 is arranged on a pipeline between the inlet of each resin column 7 and the mother liquor inlet of the organic matter adsorption device 6; a second valve 18 is arranged on a pipeline between the outlet of each resin column 7 and the mother liquor outlet of the organic matter adsorption device 6; a third valve 19 is arranged on a pipeline between the inlet of each resin column 7 and the resin cleaning liquid inlet of the organic matter adsorption device 6; a fourth valve 20 is arranged on a pipeline between the outlet of each resin column 7 and the resin cleaning waste liquid outlet of the organic matter adsorption device 6;
a liquid storage area 11 is arranged at the upper part of the organic matter separation tower 9, and a resin cleaning liquid outlet is formed in the liquid storage area 11; the lower part of the organic matter separation tower 9 is provided with a heating zone 13, and the heating zone 13 is provided with a resin cleaning waste liquid inlet;
a resin cleaning waste liquid inlet of the organic matter separation tower 9 is communicated with a resin cleaning waste liquid outlet of the organic matter adsorption device 6 through a pipeline; the resin cleaning liquid outlet of the organic matter separation tower 9 is communicated with the resin cleaning liquid inlet of the organic matter adsorption device 6 through a pipeline;
a heater 12 is arranged in a heating zone 13 of the organic matter separation tower 9; a condenser 10 is arranged in a liquid storage area 11 of the organic matter separation tower 9;
the bottom of the organic matter separation tower 9 is provided with an organic pollutant discharge port 14;
and a sight glass (not shown in the figure) is also arranged on the side wall of the liquid storage area 11 of the organic matter separation tower 9, and the sight glass and the condenser 10 are arranged on the same horizontal line.
The method comprises the following steps of treating wastewater subjected to nanofiltration treatment in a certain coal chemical plant, wherein the Total Organic Carbon (TOC) concentration of the wastewater is 5-50 mg/L, and the wastewater is used as the wastewater to be evaporated and crystallized:
the wastewater after nanofiltration treatment in a certain coal chemical plant enters a to-be-evaporated waste liquid conveying pipeline 16 and enters an evaporation crystallizer 1 through a heat exchanger 4; the evaporation crystallization mother liquor left after evaporation crystallization is filtered by the solid-liquid separator 2 and then discharged out of the evaporation crystallizer 1; then, the mixture flows through the heat exchanger 4 and the desalting filter 5 in sequence; the mother liquor passing through the desalting filter 5 enters a working resin column of the organic matter adsorption device 6, and the ratio of the flow of the mother liquor entering the organic matter adsorption device 6 to the flow of the wastewater entering the waste liquid conveying pipeline 16 to be evaporated is 1: 20;
the first valve 17 and the second valve 18 corresponding to the working resin column in the organic matter adsorption device 6 are opened, and the third valve 19 and the fourth valve 20 are closed; the mother liquor treated by the working resin column flows back to the evaporative crystallizer 1 through the heat exchanger 4 again.
After the process is continuously carried out for 5 days, the purity of the sodium chloride crystal salt generated in the evaporative crystallizer 1 is higher than 99.5 percent and reaches the industrial salt standard, and the TOC concentration of the evaporative crystallization mother liquor is lower than 10 mg/L.
When the adsorption capacity of the adsorption resin in the working resin column on the organic matters in the mother liquor reaches a saturated state, closing a first valve 17 and a second valve 18 corresponding to the working resin column, and opening a third valve 19 and a fourth valve 20 corresponding to the working resin column; and the first valve 17 and the second valve 18 of the regenerated resin column are opened, and the third valve 19 and the fourth valve 20 of the regenerated resin column are closed, so that the switching between the working resin column and the regenerated resin column is realized;
the mother liquor passing through the desalting filter 5 enters a switched working resin column;
the resin cleaning liquid methanol in the liquid storage area 11 of the organic matter separation tower 9 enters the switched regenerated resin column, so that the adsorption resin in the resin cleaning liquid methanol is cleaned and regenerated;
when the regeneration of the adsorption resin in the regenerated resin column is finished, closing the third valve 19 and the fourth valve 20 corresponding to the regenerated resin column;
and when the adsorption capacity of the adsorption resin in the working resin column to be switched on the organic matters in the mother liquor reaches a saturated state, closing the first valve 17 and the second valve 18 corresponding to the working resin column after switching, opening the third valve 19 and the fourth valve 20 corresponding to the working resin column after switching, and opening the first valve 17 and the second valve 18 corresponding to the regenerated resin column after switching so as to realize the re-switching of the working resin after switching and the regenerated resin after switching.
The resin cleaning waste liquid generated after the methanol cleaning adsorption resin flows out from a resin cleaning waste liquid outlet of the organic matter adsorption device 6 and enters a heating zone 13 of the organic matter separation tower 9 through a pipeline; setting the temperature of a heater to 65 ℃, evaporating methanol in the resin cleaning waste liquid under the action of the heater 12, enabling methanol steam to rise to the liquid storage area 11, and condensing into liquid methanol to flow into the liquid storage area 11 after encountering the condenser 10; after the condensate droplets are no longer generated in the condenser 10 as observed through the sight glass of the liquid storage region 11, the waste liquid remaining after the heating evaporation in the heating region 13 is discharged from the organic pollutant discharge port 14.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.
Claims (8)
1. A processing system for evaporating a crystallization mother liquor, the system comprising: the system comprises an evaporation crystallizer, a heat exchanger, a desalting filter, an organic matter adsorption device and an organic matter separation tower;
a water outlet pipe is arranged at the position of the evaporative crystallizer, which is 1/4-1/3 away from the bottom, and the water inlet end of the water outlet pipe penetrates through the side wall of the evaporative crystallizer and is arranged in the evaporative crystallizer;
a solid-liquid separator is arranged in the evaporative crystallizer, and a water outlet of the solid-liquid separator is connected with a water inlet end of the water outlet pipe; the solid-liquid separator is used for separating crystallized salt in evaporative crystallization mother liquor to be discharged from a water outlet pipe of the evaporative crystallizer;
the water outlet end of the water outlet pipe of the evaporative crystallizer is communicated with a hot fluid inlet of the heat exchanger; a hot fluid outlet of the heat exchanger is communicated with an inlet of the desalting filter through a pipeline; the desalting filter is used for filtering out crystallized salt in the mother liquor subjected to heat exchange and temperature reduction by the heat exchanger; a cold fluid inlet of the heat exchanger is communicated with a waste water conveying pipeline to be evaporated; a cold fluid outlet of the heat exchanger is communicated with a water inlet of the evaporative crystallizer through a pipeline;
the organic matter adsorption device is provided with a mother liquid inlet, a mother liquid outlet, a resin cleaning liquid inlet and a resin cleaning waste liquid outlet, and the mother liquid inlet of the organic matter adsorption device is communicated with the outlet of the desalting filter through a pipeline; a mother liquid outlet of the organic matter adsorption device is communicated with the waste water conveying pipeline to be evaporated through a pipeline;
the organic matter separation tower is provided with a resin cleaning waste liquid inlet and a resin cleaning liquid outlet; a resin cleaning waste liquid inlet of the organic matter separation tower is communicated with a resin cleaning waste liquid outlet of the organic matter adsorption device through a pipeline; the resin cleaning liquid outlet of the organic matter separation tower is communicated with the resin cleaning liquid inlet of the organic matter adsorption device through a pipeline;
at least one working resin column and at least one regeneration resin column which are connected in parallel are arranged in the organic matter adsorption device; each resin column is provided with an inlet and an outlet;
the inlet of each resin column is respectively communicated with a mother liquor inlet of the organic matter adsorption device through a pipeline, and the inlet of each resin column is respectively communicated with a resin cleaning solution inlet of the organic matter adsorption device through a pipeline; the outlet of each resin column is respectively communicated with a mother liquor outlet of the organic matter adsorption device through a pipeline, and the outlet of each resin column is respectively communicated with a resin cleaning waste liquor outlet of the organic matter adsorption device through a pipeline;
a first valve is arranged on a pipeline between the inlet of each resin column and the mother liquid inlet of the organic matter adsorption device; a second valve is arranged on a pipeline between the outlet of each resin column and the mother liquor outlet of the organic matter adsorption device; a third valve is arranged on a pipeline between the inlet of each resin column and the resin cleaning liquid inlet of the organic matter adsorption device; a fourth valve is arranged on a pipeline between the outlet of each resin column and the resin cleaning waste liquid outlet of the organic matter adsorption device;
the upper part of the organic matter separation tower is provided with a liquid storage area, and the lower part of the organic matter separation tower is provided with a heating area; a heater is arranged in the heating zone and used for heating the resin cleaning waste liquid in the heating zone to gasify the resin cleaning liquid in the resin cleaning waste liquid; a condenser is arranged in the liquid storage area of the organic matter separation tower and is used for condensing the gasified resin cleaning liquid into liquid; the condensed resin cleaning liquid flows back to the liquid storage area;
the bottom of the organic matter separation tower is provided with an organic pollutant discharge port for discharging residual waste liquid after heating and evaporation in a heating zone.
2. The system for treating mother liquor of evaporative crystallization of claim 1,
and a circulating pump is arranged on a water outlet pipe outside the evaporative crystallizer.
3. The system for treating mother liquor of evaporative crystallization of claim 1,
and a check valve is arranged on a pipeline between the mother liquor outlet of the organic matter adsorption device and the waste water conveying pipeline to be evaporated.
4. The system for treating mother liquor of evaporative crystallization of claim 1,
and a resin cleaning pump is arranged on a pipeline between the resin cleaning liquid outlet of the organic matter separation tower and the resin cleaning liquid inlet of the organic matter adsorption device.
5. The system for treating mother liquor of evaporative crystallization of claim 1,
and a working resin column and a regeneration resin column which are connected in parallel are arranged in the organic matter adsorption device.
6. The system for treating mother liquor of evaporative crystallization of claim 1,
the heat exchanger is a plate heat exchanger.
7. The system for treating mother liquor of evaporative crystallization of claim 1,
the heater is an electric heater.
8. The system for treating mother liquor of evaporative crystallization of claim 1,
and a sight glass is further arranged on the side wall of the liquid storage area of the organic matter separation tower, and the sight glass and the condenser are arranged on the same horizontal line.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920271207.0U CN209923113U (en) | 2019-03-04 | 2019-03-04 | Processing system of evaporation crystallization mother liquor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109912095A (en) * | 2019-03-04 | 2019-06-21 | 博天环境集团股份有限公司 | A kind of processing system and method for evaporative crystallization mother liquor |
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2019
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109912095A (en) * | 2019-03-04 | 2019-06-21 | 博天环境集团股份有限公司 | A kind of processing system and method for evaporative crystallization mother liquor |
| CN109912095B (en) * | 2019-03-04 | 2023-11-10 | 博天环境集团股份有限公司 | Treatment system and method for evaporating crystallization mother liquor |
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