CN110902742A - Method for recovering organic matters in high-concentration organic wastewater - Google Patents
Method for recovering organic matters in high-concentration organic wastewater Download PDFInfo
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F1/00—Treatment of water, waste water, or sewage
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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Abstract
The invention belongs to the field of chemical industry, and particularly relates to a method for recovering organic matters in high-concentration organic wastewater, which comprises the steps of enabling the high-concentration organic wastewater to sequentially enter a distillation water condenser, an organic matter condenser and a dehydration tower for treatment, condensing water vapor at the top of the dehydration tower and then entering a distilled water storage tank, and enabling dehydrated organic matters at the bottom of the dehydration tower to enter a refining tower; after being treated by the refining tower, pure organic matter high-temperature steam is obtained at the top of the refining tower, and the pure organic matter high-temperature steam is converted into liquid organic matter after heat exchange in an organic matter condenser and enters an organic matter storage tank. The invention can effectively improve the concentration of organic matters in the wastewater, reduce the energy consumption of the subsequent dehydration operation and save a cooling water system. In the process of evaporating the waste water, the high-concentration organic waste water is heated by utilizing the water vapor generated in the dehydration process of the organic waste water and the pure organic matter vapor generated in the rectification process, so that the waste water is partially evaporated, the organic matter concentration of the organic waste water entering the dehydration tower is improved, and the energy consumption in the process of dehydrating the waste water is reduced.
Description
Technical Field
The invention belongs to the field of chemical industry, and particularly relates to a method for recovering organic matters in high-concentration organic wastewater.
Background
Organic wastewater containing organic matters has high chemical oxygen consumption, and direct discharge can cause water quality eutrophication and harm ecological environment. A concentration method for recovering useful substances by evaporating and concentrating organic wastewater is an effective organic wastewater treatment method.
The traditional evaporation concentration method of multi-effect rectification can realize the recovery of organic matters, but because of the defects of low steam utilization efficiency, high operating cost and the like, a large amount of energy consumption can be consumed when high-concentration organic wastewater is treated, and impurities in the wastewater still remain in the organic matter concentrated solution, so that the purity of the recovered organic matters is not high.
Patent CN 105152863B relates to a method for recovering ethylene glycol and acetaldehyde from polyester waste water. According to the method, the ethylene glycol primary distillation tower and the ethylene glycol distillation tower are in cascade connection, and high-temperature waste gas generated at the top of the distillation tower is sent to a reboiler of the primary distillation tower to be used as a heat source, so that energy recovery and utilization are realized, and the energy consumption of a device is reduced. However, in the method, the high-temperature waste gas in the rectifying tower and the ethylene glycol waste liquid are converted into a gas-liquid mixture after heat exchange, which indicates that the energy consumption in the waste gas is not fully utilized, and simultaneously, the requirement of industrial products cannot be met although the concentration of the ethylene glycol in the rectifying tower is higher.
Patent CN 103936572B relates to a device for recovering acetaldehyde and ethylene glycol from polyester waste water. According to the device, acetaldehyde with a low boiling point in the wastewater is separated, then the glycol solution in the wastewater is introduced into a glycol rectifying tower for evaporation and concentration, and finally the acetaldehyde with the purity of more than or equal to 99% and the glycol solution with the concentration of more than or equal to 85% are obtained. Although the device can recover acetaldehyde and ethylene glycol from polyester wastewater and reduce the pollution of the wastewater, the energy of the device is not reused in the operation process, the purity of the obtained final product is low, and a cooling water system is still needed in the evaporation process of the wastewater.
Patent CN 104926676B discloses a solvent recovery system for low concentration DMF salt-containing wastewater. The system adopts double-effect or multi-effect evaporation and rectification to treat the low-concentration DMF salt-containing wastewater; by setting the operating pressure of the rectifying tower, steam at the top of the rectifying tower in the previous effect is used as a heat source of an evaporator of the rectifying tower in the next effect, the problem of tower blockage during the rectification of the salt-containing DMF wastewater is solved, and the high-purity salt and DMF products are finally obtained. Although the device effectively utilizes the latent heat of steam to obtain high-concentration DMF, impurities in the wastewater still remain in the DMF solution after treatment, the obtained DMF cannot be used as an industrial raw material, and the method needs to generate more water steam in the evaporation process if the latent heat of the water steam is utilized, so that the method can only treat low-concentration wastewater and is not suitable for high-concentration wastewater with less water steam generated in the evaporation process, and a cooling water system is still needed in the evaporation process.
Disclosure of Invention
In order to overcome the problems in the prior art, the invention provides a method for recovering water-soluble organic matters in high-concentration organic wastewater.
The specific technical scheme of the invention is as follows:
a method for recovering water-soluble organic matters in high-concentration organic wastewater is characterized by comprising the following steps: high-concentration organic wastewater sequentially enters a distillation water condenser, an organic matter condenser and a dehydration tower for treatment, water vapor at the top of the dehydration tower is condensed and then enters a distilled water storage tank, and dehydrated organic matters at the bottom of the dehydration tower enter a refining tower; after being treated by the refining tower, pure organic matter high-temperature steam is obtained at the top of the refining tower, and the pure organic matter high-temperature steam is converted into liquid organic matter after heat exchange in an organic matter condenser and enters an organic matter storage tank.
The specific process comprises the following steps:
s1, enabling the high-concentration organic wastewater to enter a distillation water condenser for heat exchange, enabling the wastewater after heat exchange to be partially evaporated after heat exchange with pure organic steam in an organic condenser to become organic wastewater containing steam, and enabling the organic wastewater to enter a dehydration tower for dehydration, wherein the pure organic steam refers to the high-concentration organic wastewater, and the pure organic steam is generated by evaporation in a refining tower after the organic wastewater is completely dehydrated in the dehydration tower; the pure organic matter steam is changed into liquid and enters an organic matter storage tank; the organic wastewater containing steam enters a dehydration tower for dehydration, and the pure organic steam is changed into liquid and then enters an organic storage tank.
S2, allowing the steam-containing organic wastewater subjected to heat exchange in the step S1 to enter a dehydration tower from the middle of the dehydration tower through a pipeline, treating the organic wastewater, allowing water vapor containing a small amount of organic matters to enter a shell pass of a distilled water condenser from the top of the dehydration tower, condensing the water vapor to obtain distilled water with the concentration of the organic matters not more than 5%, dividing the distilled water into two paths through a pipeline, refluxing one path of distilled water to the top of the dehydration tower through the pipeline, performing heat exchange with the water vapor containing the organic matters at the top of the dehydration tower, changing the organic matters in the water vapor into liquid, returning the liquid to the bottom of the dehydration tower, and allowing the other; the tube pass cooling medium of the distilled water condenser is high-concentration organic wastewater raw material liquid which is preliminarily preheated. The organic matter after dehydration is divided into two paths by a tower kettle of a dehydration tower through a lifting pump of the dehydration tower: one path enters a dehydrating tower reboiler, and the other path is discharged to a refining tower.
The distilled water at the top of the dehydrating tower can be conveyed by a pump, and the gravity self-flow conveying can also be realized by the relative positions of a distilled water condenser, the dehydrating tower and a distilled water tank.
The distillation water condenser is connected with a vacuum pump of the dehydration tower, and a system formed by the distillation water condenser, the dehydration tower reboiler and the distillation water tank runs in a vacuum state.
S3, the dehydrated organic matter enters a refining tower, after treatment, the high-concentration organic matter concentrated solution at the bottom of the refining tower enters a tube pass of a reboiler of the refining tower through a lifting pump of the refining tower, the high concentration refers to the content of more than 99 percent, the high-concentration organic matter concentrated solution exchanges heat with an external heat source of a shell pass of the reboiler of the refining tower and then becomes pure organic matter steam, the pure organic matter steam enters the shell pass of an organic matter condenser under the action of a vacuum pump of the refining tower from the top of the refining tower and exchanges heat with the primarily preheated high-concentration organic wastewater in the tube pass of the organic matter condenser to become pure organic matter liquid, and the pure organic matter liquid enters an organic matter storage tank.
Furthermore, the temperature of a heating medium provided by the external heat source in the reboiler is 5-12 ℃ higher than that of the concentrated solution entering the heat exchanger. More preferably 8 to 10 ℃ higher.
Further, the degree of vacuum in the dehydration column is not higher than that in the refining column.
Further, the water-soluble organic substances contained in the high-concentration organic wastewater may cause the boiling point of the aqueous solution thereof to be increased and may not form an azeotrope with water.
Further, the water-soluble organic substances contained in the initial organic wastewater include, but are not limited to, glycols, propylene glycol, glycols, water-soluble alcohols, formamides, and/or alcamines.
Further, the concentration of the organic matter in the initial organic wastewater is 45-85%, preferably 55-80%, and more preferably 60-75%.
Furthermore, the concentration of the organic matters in the organic matter concentrated solution entering the refining tower is not less than 99%.
Further, the concentration of the organic matters in the organic matter storage tank is not less than 99%, and preferably 99.5-99.9%.
Furthermore, the concentration of the organic matters in the distilled water is not higher than 2%, and is preferably 0.2-1%.
The invention has the advantages that:
1. the invention can effectively improve the concentration of organic matters in the wastewater, reduce the energy consumption of the subsequent dehydration operation and save a cooling water system. In the process of evaporating the waste water, the high-concentration organic waste water is heated by utilizing the water vapor generated in the dehydration process of the organic waste water and the pure organic matter vapor generated in the rectification process, so that the waste water is partially evaporated, the organic matter concentration of the organic waste water entering the dehydration tower is improved, and the energy consumption in the process of dehydrating the waste water is reduced.
2. The invention adopts the pure organic steam generated in the refining process of the organic concentrated solution as the heat source to evaporate and concentrate the wastewater, fully utilizes the latent heat of the pure organic steam, realizes the secondary utilization of energy, reduces the concentration of the organic matters contained in the steam at the top of the dehydrating tower, reduces the reflux amount of distilled water and obviously reduces the energy consumption during the dehydration of the organic matters.
3. The concentration of the organic matters entering the refining tower is more than or equal to 99 percent, the purity of the organic matters in the rectifying tower is ensured, and meanwhile, a reflux device is not needed on the refining tower, so that the energy consumption of the concentrated solution in the refining process due to the evaporation of the reflux liquid is reduced, and the energy consumption in the rectifying process is further reduced.
4. The invention utilizes the high-concentration organic wastewater to condense the steam generated in the rectification process, thereby not only improving the concentration of organic matters in the organic wastewater, but also not consuming cooling water.
5. The invention has the advantages of compact equipment, small occupied area, simple flow and convenient operation.
Drawings
FIG. 1 is a process flow diagram of the present application.
In the drawings: 1: a dehydration tower; 2. a dehydration tower lift pump; 3. a dehydration column reboiler; 4. a distilled water condenser; 5. a distilled water storage tank; 6. a dehydration tower vacuum pump; 7. a refining tower; 8. a refining tower lift pump; 9. a refining column reboiler; 10. an organic matter condenser; 11. refining a tower vacuum pump; 12. and (4) an organic matter storage tank.
Detailed Description
The high-concentration organic wastewater mentioned in the present application refers to wastewater with an organic concentration of 45-85%, and for better illustration of the present invention, the present invention can be explained in more detail by the following examples. The present invention is not limited to the following examples.
Example 1
A method for recovering water-soluble organic matters in high-concentration organic wastewater comprises the steps of enabling the high-concentration organic wastewater to sequentially enter a distilled water condenser 4, an organic matter condenser 10 and a dehydration tower 1 for treatment, condensing water vapor at the top of the dehydration tower 1 and then entering a distilled water storage tank 5, and enabling dehydrated organic matters at the bottom of the dehydration tower 1 to enter a refining tower 7; after being treated by the refining tower 7, pure organic matter high-temperature steam is obtained at the top of the refining tower 7, and is changed into liquid organic matter after heat exchange in the organic matter condenser 10, and then the liquid organic matter enters the organic matter storage tank 12.
Example 2
A method for recovering water-soluble organic matters in high-concentration organic wastewater is characterized by comprising the following steps: high-concentration organic wastewater sequentially enters a distillation water condenser 4, an organic matter condenser 10 and a dehydration tower 1 for treatment, water vapor at the top of the dehydration tower 1 is condensed and then enters a distilled water storage tank 5, and dehydrated organic matters at the bottom of the dehydration tower 1 enter a refining tower 7; after being treated by the refining tower 7, pure organic matter high-temperature steam is obtained at the top of the refining tower 7, and is changed into liquid organic matter after heat exchange in the organic matter condenser 10, and then the liquid organic matter enters the organic matter storage tank 12.
The specific process comprises the following steps:
s1, enabling the high-concentration organic wastewater to enter a distilled water condenser 4 for heat exchange, enabling the wastewater after heat exchange to be partially evaporated after heat exchange with pure organic steam in an organic condenser 10 to become organic wastewater containing steam, and enabling the organic wastewater to enter a dehydration tower 1 for dehydration, wherein the pure organic steam refers to the high-concentration organic wastewater, and is evaporated in a refining tower 7 to generate pure organic steam after being completely dehydrated in the dehydration tower 1; the pure organic matter vapor becomes liquid and enters the organic matter storage tank 12; the organic wastewater containing steam enters the dehydration tower 1 for dehydration, and the pure organic steam is changed into liquid and then enters the organic storage tank 12.
S2, allowing the steam-containing organic wastewater subjected to heat exchange in the step S1 to enter a dehydration tower 1 from the middle of the dehydration tower 1 through a pipeline, after treatment, allowing water vapor containing a small amount of organic matters to enter a shell pass of a distilled water condenser 4 from the top of the dehydration tower 1 for condensation, and dividing the finally obtained distilled water into two paths, wherein the organic matters in the distilled water have a concentration of no more than 5%, the distilled water flows back to the top of the dehydration tower 1 through a pipeline and exchanges heat with the water vapor containing the organic matters at the top of the dehydration tower 1, the organic matters in the water vapor are changed into liquid and return to the bottom of the dehydration tower 1, and the distilled water flows into a distilled water tank through; the tube pass cooling medium of the distilled water condenser 4 is a high-concentration organic wastewater raw material liquid which is preliminarily preheated. The organic matter after dehydration is divided into two paths by a tower kettle of a dehydration tower 1 through a dehydration tower lift pump 2: one path enters a dehydrating tower reboiler 3, and the other path is discharged to a refining tower 7.
The distilled water at the top of the dehydrating tower 1 can be conveyed by a pump, and the gravity self-flow conveying can also be realized by the relative positions of the distilled water condenser 4, the dehydrating tower 1 and the distilled water tank.
The distillation water condenser 4 is connected with the dehydration tower vacuum pump 6, and the system formed by the distillation water condenser, the dehydration tower reboiler 3 and the distillation water tank runs under the vacuum state.
S3, the dehydrated organic matter enters a refining tower 7, after treatment, the high-concentration organic matter concentrated solution at the bottom of the refining tower 7 enters a tube pass of a refining tower reboiler 9 through a refining tower lift pump 8, the high concentration refers to the content of more than 99%, the high-concentration organic matter concentrated solution exchanges heat with an external heat source of a shell pass of the refining tower reboiler 9 and then becomes pure organic matter steam, the pure organic matter steam enters the shell pass of an organic matter condenser 10 from the top of the refining tower 7 under the action of a refining tower vacuum pump 11 and exchanges heat with the preliminarily preheated high-concentration organic wastewater in the tube pass of the organic matter condenser 10 to become pure organic matter liquid, and the pure organic matter liquid enters an organic matter storage tank 12.
Example 3
A method for recovering water-soluble organic matters in high-concentration organic wastewater is characterized by comprising the following steps: high-concentration organic wastewater sequentially enters a distillation water condenser 4, an organic matter condenser 10 and a dehydration tower 1 for treatment, water vapor at the top of the dehydration tower 1 is condensed and then enters a distilled water storage tank 5, and dehydrated organic matters at the bottom of the dehydration tower 1 enter a refining tower 7; after being treated by the refining tower 7, pure organic matter high-temperature steam is obtained at the top of the refining tower 7, and is changed into liquid organic matter after heat exchange in the organic matter condenser 10, and then the liquid organic matter enters the organic matter storage tank 12.
The specific process comprises the following steps:
s1, enabling the high-concentration organic wastewater to enter a distilled water condenser 4 for heat exchange, enabling the wastewater after heat exchange to be partially evaporated after heat exchange with pure organic steam in an organic condenser 10 to become organic wastewater containing steam, and enabling the organic wastewater to enter a dehydration tower 1 for dehydration, wherein the pure organic steam refers to the high-concentration organic wastewater, and is evaporated in a refining tower 7 to generate pure organic steam after being completely dehydrated in the dehydration tower 1; the pure organic matter vapor becomes liquid and enters the organic matter storage tank 12; the organic wastewater containing steam enters the dehydration tower 1 for dehydration, and the pure organic steam is changed into liquid and then enters the organic storage tank 12.
S2, allowing the steam-containing organic wastewater subjected to heat exchange in the step S1 to enter a dehydration tower 1 from the middle of the dehydration tower 1 through a pipeline, after treatment, allowing water vapor containing a small amount of organic matters to enter a shell pass of a distilled water condenser 4 from the top of the dehydration tower 1 for condensation, and dividing the finally obtained distilled water into two paths, wherein the organic matters in the distilled water have a concentration of no more than 5%, the distilled water flows back to the top of the dehydration tower 1 through a pipeline and exchanges heat with the water vapor containing the organic matters at the top of the dehydration tower 1, the organic matters in the water vapor are changed into liquid and return to the bottom of the dehydration tower 1, and the distilled water flows into a distilled water tank through; the tube pass cooling medium of the distilled water condenser 4 is a high-concentration organic wastewater raw material liquid which is preliminarily preheated. The organic matter after dehydration is divided into two paths by a tower kettle of a dehydration tower 1 through a dehydration tower lift pump 2: one path enters a dehydrating tower reboiler 3, and the other path is discharged to a refining tower 7.
The distilled water at the top of the dehydrating tower 1 can be conveyed by a pump, and the gravity self-flow conveying can also be realized by the relative positions of the distilled water condenser 4, the dehydrating tower 1 and the distilled water tank.
The distillation water condenser 4 is connected with the dehydration tower vacuum pump 6, and the system formed by the distillation water condenser, the dehydration tower reboiler 3 and the distillation water tank runs under the vacuum state.
S3, the dehydrated organic matter enters a refining tower 7, after treatment, the high-concentration organic matter concentrated solution at the bottom of the refining tower 7 enters a tube pass of a refining tower reboiler 9 through a refining tower lift pump 8, the high concentration refers to the content of more than 99%, the high-concentration organic matter concentrated solution exchanges heat with an external heat source of a shell pass of the refining tower reboiler 9 and then becomes pure organic matter steam, the pure organic matter steam enters the shell pass of an organic matter condenser 10 from the top of the refining tower 7 under the action of a refining tower vacuum pump 11 and exchanges heat with the preliminarily preheated high-concentration organic wastewater in the tube pass of the organic matter condenser 10 to become pure organic matter liquid, and the pure organic matter liquid enters an organic matter storage tank 12.
The temperature of a heating medium provided by the external heat source in the reboiler is 5-12 ℃ higher than that of the concentrated solution entering the heat exchanger. More preferably 8 to 10 ℃ higher.
The degree of vacuum in the dehydration column 1 is not higher than that in the refining column 7.
The water-soluble organic matter contained in the high-concentration organic wastewater can cause the boiling point of the aqueous solution to be increased and does not form an azeotrope with water.
The water-soluble organic materials contained in the initial organic wastewater include, but are not limited to, ethylene glycol, propylene glycol, diethylene glycol water-soluble alcohols, formamides, and/or alcamines.
The concentration of the organic matters in the initial organic wastewater is 45-85%, preferably 55-80%, and more preferably 60-75%.
The concentration of the organic matters in the organic matter concentrated solution entering the refining tower 7 is not less than 99 percent.
The concentration of the organic matters in the organic matter storage tank 12 is not less than 99%, and preferably 99.5-99.9%.
The concentration of organic matters in the distilled water is not higher than 2%, and preferably 0.2-1%.
Example 4
On the basis of examples 1-3, a method for recovering water-soluble organic matters in high-concentration organic wastewater with reference to the attached figure 1 comprises the following steps when treating high-concentration ethylene glycol wastewater:
firstly, glycol wastewater with the concentration of 60% enters a distilled water condenser 4 through siphonage to exchange heat with high-temperature condensed water so as to raise the temperature of the wastewater; the waste water with the increased temperature enters an organic matter condenser 10 to exchange heat with ethylene glycol steam and then is evaporated and concentrated to become organic waste water containing steam, the concentration of ethylene glycol in the waste water is increased at the moment, and the ethylene glycol steam becomes liquid and enters an ethylene glycol storage tank 12;
secondly, the glycol wastewater containing steam enters the middle part of a dehydration tower 1 through a pipeline, the liquid in the wastewater flows into the bottom of the dehydration tower, enters the tube pass of a reboiler 3 of the dehydration tower through a lift pump 2 of the dehydration tower, exchanges heat with an external heating source in the shell pass of the reboiler 3 of the dehydration tower and then carries out evaporation concentration, the generated glycol gas-liquid mixture returns to the bottom of the dehydration tower 1, the glycol concentrated solution in the gas-liquid mixture enters the middle part of a refining tower 7 through the lift pump 2 of the dehydration tower at the bottom of the dehydration tower 1, the glycol steam is mixed with the steam in the first step wastewater and then rises to the top of the dehydration tower, after exchanging heat with reflux liquid of distilled water, most of the glycol in the steam becomes liquid and returns to the bottom of the dehydration tower, the steam containing a small amount of glycol enters the shell pass of a distillation water condenser 4 under the action of a vacuum pump 6 of the dehydration tower, and becomes distilled water after exchanging heat with high-concentration organic, the distilled water is divided into two paths through a pipeline, one path of distilled water flows back to the top of the dehydration tower through the pipeline and exchanges heat with the water vapor containing the glycol at the top of the dehydration tower, the glycol in the water vapor is changed into liquid and returns to the bottom of the dehydration tower, and the other path of distilled water enters the distilled water tank 5 through the pipeline;
thirdly, the glycol concentrated solution at the bottom of the refining tower 7 enters a tube pass of a reboiler 9 of the refining tower through a lifting pump 8 of the refining tower, exchanges heat with an external heat source at a shell pass of the reboiler 9 of the refining tower to form glycol steam, the glycol steam enters the refining tower and rises to the top of the refining tower, enters a shell pass of an organic matter condenser 10 under the action of a vacuum pump 11 of the refining tower, exchanges heat with 60% concentration glycol wastewater after the temperature in the tube pass of the organic matter condenser 10 to form glycol liquid, and enters an organic matter storage tank 12.
The invention is not described in detail in the prior art or can be implemented using the prior art.
The invention is not limited to the embodiments disclosed above, and all variations and modifications of the examples that come within the spirit and scope of the invention are intended to be covered by the scope of the invention.
Claims (10)
1. A method for recovering water-soluble organic matters in high-concentration organic wastewater is characterized by comprising the following steps: high-concentration organic wastewater sequentially enters a distillation water condenser (4), an organic matter condenser (10) and a dehydration tower (1) for treatment, water vapor at the top of the dehydration tower (1) is condensed and then enters a distillation water storage tank (5), and dehydrated organic matters at the bottom of the dehydration tower (1) enter a refining tower (7); after being treated by the refining tower (7), pure organic matter high-temperature steam is obtained at the top of the refining tower (7), and the pure organic matter high-temperature steam is converted into liquid organic matter after heat exchange in an organic matter condenser (10) and enters an organic matter storage tank (12).
2. The method for recovering water-soluble organic matters from high-concentration organic wastewater according to claim 1, characterized in that: the specific process comprises the following steps:
s1, enabling high-concentration organic wastewater to enter a distillation water condenser (4) for heat exchange, enabling the wastewater after heat exchange to be subjected to partial evaporation after heat exchange with pure organic steam in an organic condenser (10) to become organic wastewater containing steam, entering a dehydration tower (1) for dehydration, and after complete dehydration in the dehydration tower (1), evaporating the organic wastewater in a refining tower (7) to generate pure organic steam; the pure organic matter steam is changed into liquid and enters an organic matter storage tank (12); organic wastewater containing steam enters a dehydration tower (1) for dehydration, and pure organic steam is changed into liquid and then enters an organic storage tank (12);
s2, the organic wastewater containing steam after heat exchange in the step S1 enters a dehydration tower (1) from the middle part of the dehydration tower (1) through a pipeline, after treatment, water vapor containing a small amount of organic matters enters a shell pass of a distilled water condenser (4) from the top of the dehydration tower (1) to be condensed, the concentration of the organic matters in the finally obtained distilled water is not more than 5 percent, the distilled water is divided into two paths through a pipeline, one path of distilled water flows back to the top of the dehydration tower (1) through the pipeline and exchanges heat with the water vapor containing the organic matters at the top of the dehydration tower (1), the organic matters in the water vapor are changed into liquid and return to the bottom of the dehydration tower (1), and the other path of distilled water enters a distilled water; the tube pass cooling medium of the distilled water condenser (4) is high-concentration organic wastewater raw material liquid which is preliminarily preheated; the organic matter after dehydration is divided into two paths by a tower kettle of a dehydration tower (1) through a dehydration tower lift pump (2): one path enters a dehydrating tower reboiler (3), and the other path is discharged to a refining tower (7);
s3, the dehydrated organic matter enters a refining tower (7), after treatment, the high-concentration organic matter concentrated solution at the bottom of the refining tower (7) enters a tube pass of a refining tower reboiler (9) through a refining tower lift pump (8), and is subjected to heat exchange with an external heat source of a shell pass of the refining tower reboiler (9) to form pure organic matter steam, the pure organic matter steam enters a shell pass of an organic matter condenser (10) under the action of a refining tower vacuum pump (11) from the top of the refining tower (7), and is subjected to heat exchange with the primarily preheated high-concentration organic wastewater in the tube pass of the organic matter condenser (10) to form pure organic matter liquid, and the pure organic matter liquid enters an organic matter storage tank (12).
3. The method for recovering water-soluble organic matters from high-concentration organic wastewater according to claim 2, characterized in that: the temperature of a heating medium provided by the external heat source in the reboiler is 5-12 ℃ higher than that of the concentrated solution entering the heat exchanger.
4. The method for recovering water-soluble organic matters from high-concentration organic wastewater according to claim 2, characterized in that: the degree of vacuum in the dehydration column (1) is not higher than the degree of vacuum in the refining column (7).
5. The method for recovering water-soluble organic matters from high-concentration organic wastewater according to claim 2, characterized in that: the distilled water at the top of the dehydrating tower (1) is conveyed by a pump or gravity self-flow conveying is realized through the relative positions of a distilled water condenser (4) and the dehydrating tower (1) and a distilled water tank.
6. The method for recovering water-soluble organic matters from high-concentration organic wastewater according to claim 2, characterized in that: the distillation water condenser (4) is connected with the dehydration tower vacuum pump (6), and the system composed of the distillation water condenser, the dehydration tower reboiler (3) and the distillation water tank runs under the vacuum state.
7. The method for recovering water-soluble organic matters from high-concentration organic wastewater according to claim 2, characterized in that: the water-soluble organic matter contained in the high-concentration organic wastewater can cause the boiling point of the aqueous solution to be increased and does not form an azeotrope with water.
8. The method for recovering water-soluble organic matters from high-concentration organic wastewater according to claim 2, characterized in that: the water-soluble organic materials contained in the initial organic wastewater include, but are not limited to, ethylene glycol, propylene glycol, diethylene glycol water-soluble alcohols, formamides, and/or alcamines.
9. The method for recovering water-soluble organic matters from high-concentration organic wastewater according to claim 2, characterized in that: the concentration of organic matters in the initial organic wastewater is 45-85%.
10. The method for recovering water-soluble organic matters from high-concentration organic wastewater according to claim 2, characterized in that: the concentration of the organic matters in the organic matter concentrated solution entering the refining tower (7) is not lower than 99 percent; the concentration of the organic matters in the organic matter storage tank (12) is not lower than 99 percent; the concentration of organic matters in the distilled water is not higher than 2%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911250294.2A CN110902742A (en) | 2019-12-09 | 2019-12-09 | Method for recovering organic matters in high-concentration organic wastewater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201911250294.2A CN110902742A (en) | 2019-12-09 | 2019-12-09 | Method for recovering organic matters in high-concentration organic wastewater |
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