CN216191557U - Linkage lime milk preparation system for wastewater pretreatment - Google Patents
Linkage lime milk preparation system for wastewater pretreatment Download PDFInfo
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- CN216191557U CN216191557U CN202122407787.1U CN202122407787U CN216191557U CN 216191557 U CN216191557 U CN 216191557U CN 202122407787 U CN202122407787 U CN 202122407787U CN 216191557 U CN216191557 U CN 216191557U
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Abstract
The utility model relates to the field of comprehensive utilization of resources, in particular to a linked lime milk preparation system for wastewater pretreatment. The system comprises a clarifying unit 1, a heat medium inlet of a heat exchanger 2 and an ash melting device 3, wherein the heat medium outlet of the heat exchanger 2 is connected with a mixed reaction unit 4, and the water outlet of the mixed reaction unit 4 is connected with a comprehensive adjusting unit (5); industrial water enters a cold medium inlet of the heat exchanger 2, and a cold medium outlet of the heat exchanger 2 is connected with an ash melting device 3; the mud outlet of the clarification unit 1 is connected with a filter pressing unit 7 through a mud pump 6, and the filtrate outlet of the filter pressing unit 7 is connected with the heat medium inlet of the heat exchanger 2. The system combines waste heat resources with the comprehensive treatment of the wastewater, not only recycles part of the wastewater resources, but also reasonably utilizes the waste heat, and utilizes the self characteristics of the saponified wastewater and the desulfurized wastewater to carry out pretreatment together, thereby saving the resources, reducing the energy consumption, saving the cost of manpower and material resources and reducing the pressure of subsequent wastewater treatment.
Description
Technical Field
The utility model relates to the field of comprehensive utilization of resources, in particular to a linked lime milk preparation system for wastewater pretreatment.
Background
In the traditional chlorohydrination method propylene oxide preparation process, lime milk needs to be prepared, in the lime milk preparation process, industrial water and saponified wastewater subjected to filter pressing treatment are firstly used for heat exchange and temperature rise, and then the industrial water enters a lime slaking machine to react with quicklime to obtain 12% -14% of lime milk. In the production process, because the temperature of industrial water entering the lime slaker is about 40 ℃, the quicklime cannot be completely digested due to low temperature of the industrial water, the temperature of the prepared lime milk is about 60 ℃, and further the unit consumption of the quicklime is high.
In addition, a large amount of saponification waste water is generated in the process of preparing the propylene oxide by the chlorohydrination method, the temperature is generally as high as 60-80 ℃, the pH value is as high as 10-12, the salt content is high, and CaCl is added2The mass fraction is 1.0-4.0%The mass fraction of SS is 0.3-0.5%, and CODcr is between 600-1500 mg/L. In addition, the wastewater contains high concentrations of organic chlorides, mainly dichloropropanol and dichloroisopropyl, propylene glycol, chloropropanol and other derivatives of propylene oxide. In the prior art, acid is generally added for pH value adjustment, after the pH value adjustment is finished, aeration or soda ash is required to be added to generate calcium carbonate precipitate for removing calcium ions, and then the calcium carbonate precipitate is sent into a comprehensive adjusting tank for subsequent treatment.
Furthermore, general chemical enterprises can generate desulfurization waste water generated by a wet desulfurization process, and particularly, power plants and the like need to desulfurize boiler flue gas to generate a large amount of desulfurization waste water. The temperature is generally 20-50 ℃, the pH value is 4-6, the chloride content is 8000-19000mg/L, the sulfide content is 2000-8000mg/L, and the specific gravity is 1.0-1.04. The process for treating the desulfurization wastewater generally comprises the steps of firstly adding alkali to adjust the pH value, and after the adjustment is finished, generally adding a calcium chloride solution to remove sulfate radicals and sulfite radicals, and then entering a comprehensive adjusting tank for subsequent treatment.
In the prior art, no solution for comprehensively processing and solving the related problems is found at present.
SUMMERY OF THE UTILITY MODEL
Aiming at the problems in the prior art, the utility model provides a linked lime milk preparation system for wastewater pretreatment. The system combines waste heat resources with the comprehensive treatment of the wastewater, not only recycles part of the wastewater resources, but also reasonably utilizes the waste heat, and utilizes the self characteristics of the saponified wastewater and the desulfurized wastewater to carry out pretreatment together, thereby saving acid, alkali and heat resources, reducing energy consumption, saving the cost of manpower and material resources and reducing the pressure of subsequent wastewater treatment.
The technical scheme of the utility model is as follows:
the system comprises a clarification unit, a heat exchanger, an ash melting device, a mixing reaction unit, a comprehensive regulation unit and the like, wherein the effluent of the clarification unit is connected with a heat medium inlet of the heat exchanger and the ash melting device; industrial water enters a cold medium inlet of the heat exchanger, and a cold medium outlet of the heat exchanger is connected with ash melting equipment; the mud outlet of the clarification unit is connected with the filter pressing unit through a mud pump, and the filtrate outlet of the filter pressing unit is connected with the heat medium inlet of the heat exchanger.
High-heat saponified wastewater generated by enterprise operation firstly enters a clarification unit (generally, the clarification unit is a clarification tank), bottom mud is pumped into a filter pressing unit through a mud pump, treated filtrate and supernatant wastewater of the clarification unit jointly serve as a heat medium to enter a heat exchanger, industrial water serves as a cold medium to enter the heat exchanger, and after heat exchange, heated industrial water enters lime slaking equipment to be used for preparing lime milk; and the temperature of the saponified wastewater after heat exchange is reduced, the saponified wastewater enters a mixing reactor, is mixed and reacted with the desulfurized wastewater, and then the liquid enters a comprehensive regulation unit (comprising the conventional regulation of various physical and chemical properties such as water quantity, water pressure, water quality and the like) and then enters biochemical treatment. Through the system, on the one hand, the heat of the saponified wastewater is fully utilized, on the other hand, the desulfurized wastewater and the saponified wastewater are simultaneously premixed, the PH is adjusted, precipitates such as CaSO4 and CaSO3 are generated, most calcium ions and sulfides are removed, the sludge amount in subsequent treatment is reduced, and the generated precipitates can be mixed with biochemical sludge to enter a filter press, so that the filter pressing difficulty is reduced, the filter pressing time is shortened, and the service life of filter cloth is prolonged.
Preferably, a flow regulating valve I is arranged between the heat exchanger and the clarification unit; and a flow regulating valve II is also arranged between the heat exchanger and the ashing equipment. When the heat exchange of the saponified wastewater is not enough to enable the industrial water to reach the corresponding temperature, the saponified wastewater can be mixed with the industrial water by adjusting the flow regulating valve I and the flow regulating valve II, so that the temperature of the industrial water is increased, and the using amount of the industrial water is reduced; if necessary, can even completely replace industrial water.
More preferably, a water cooling tower is arranged between the heat exchanger and the mixed reaction unit. When the saponification waste water is not enough cooled to a proper temperature after heat exchange through the heat exchanger, the saponification waste water coming out of the heat exchanger can be further cooled through the water cooling tower and then enters the mixed reaction unit.
Generally, the ash melting equipment is an ash melting machine, the mixing reaction unit is a mixing reaction tank, and the comprehensive adjusting unit can be a comprehensive adjusting tank. All the unit modules are in the prior art, and the utility model is not repeated.
In conclusion, the method comprehensively utilizes the characteristics of the preparation process of the saponified wastewater, the desulfurized wastewater and the lime milk, skillfully utilizes the waste heat of the saponified wastewater, neutralizes the saponified wastewater and the desulfurized wastewater, mutually adjusts the pH, reacts to remove part of calcium ions and sulfides, and reduces the sludge amount in the subsequent treatment. Not only reduces the raw material usage amount in the preparation process of independently treating the wastewater and the lime milk, reduces the cost, saves the resources, is more environment-friendly, reduces the difficulty of subsequent biochemical and advanced wastewater treatment, and improves the treatment effect! For the lime milk preparation process, lime is more thoroughly digested, the lime unit consumption can be reduced, the temperature of the prepared lime milk is about 85 ℃, steam is not required to be used for reheating the lime milk in the production process, the temperature of the lime milk is increased, and the saponification side reaction is reduced.
Drawings
FIG. 1 is a schematic structural view of embodiment 1 of the present invention;
FIG. 2 is a schematic structural view of embodiment 2 of the present invention;
wherein, 1 is a clarification unit, 2 is a heat exchanger, 3 is an ash melting device, 4 is a mixing reaction unit, 5 is a comprehensive adjusting unit, 6 is a slurry pump, 7 is a filter pressing unit, 8-1 is a flow adjusting valve I, 8-2 is a flow adjusting valve II, and 9 is a cooling tower.
Detailed Description
The present invention will be described in further detail with reference to the following examples, but it should not be construed that the scope of the above subject matter is limited to the following examples. All the technologies realized based on the above contents of the present invention belong to the scope of the present invention. Except as otherwise noted, the following examples were carried out using conventional techniques.
Example 1
As shown in fig. 1, the system comprises a clarification unit 1, a heat exchanger 2, an ash melting device 3, a mixing reaction unit 4, a comprehensive regulation unit 5 and the like, wherein the effluent of the clarification unit 1 is connected with a heat medium inlet of the heat exchanger 2 and the ash melting device 3, a heat medium outlet of the heat exchanger 2 is connected with the mixing reaction unit 4, and the effluent of the mixing reaction unit 4 is connected with the comprehensive regulation unit 5; industrial water enters a cold medium inlet of the heat exchanger 2, and a cold medium outlet of the heat exchanger 2 is connected with an ash melting device 3; the mud outlet of the clarification unit 1 is connected with a filter pressing unit 7 through a mud pump 6, and the filtrate outlet of the filter pressing unit 7 is connected with the heat medium inlet of the heat exchanger 2. A flow regulating valve I8-1 is arranged between the heat exchanger 2 and the clarification unit 1; a flow regulating valve II 8-2 is also arranged between the heat exchanger 2 and the ashing equipment.
The clarifying unit 1 is a clarifying tank, the ash melting equipment 3 is an ash melting machine, the mixing reaction unit 4 is a mixing reaction tank, the comprehensive adjusting unit 5 is a comprehensive adjusting tank, and the filter pressing unit 7 is a filter press. Each unit module is the prior art.
The working principle of the utility model is as follows: high-heat saponified wastewater generated by enterprise operation firstly enters a clarification unit 1, bottom slurry is pumped into a filter pressing unit 7 through a slurry pump 6, treated filtrate and supernatant wastewater of the clarification unit 1 jointly serve as a heat medium to enter a heat exchanger 2, industrial water serves as a cold medium to enter the heat exchanger 2, and heated industrial water enters an ash melting device 3 for preparing lime milk after heat exchange; in addition, when the temperature of the industrial water after heat exchange is low due to the condition of over-low environmental temperature and the like, the saponified wastewater is mixed with the industrial water by adjusting the flow regulating valve I8-1 and the flow regulating valve II 8-2, so that the temperature of the industrial water is increased and the consumption of the industrial water is reduced. The temperature of the saponified wastewater after heat exchange is reduced, the saponified wastewater enters a mixing reactor, and after the saponified wastewater is mixed and reacted with the desulfurized wastewater, the liquid enters a comprehensive adjusting unit 5 (comprising conventional adjustment of various physical and chemical properties such as water quantity, water pressure, water quality and the like), and then enters biochemical treatment.
Example 2
As shown in fig. 2, a more preferred embodiment of the present invention is shown.
The system comprises a clarification unit 1, a heat exchanger 2, an ash melting device 3, a mixed reaction unit 4, a comprehensive regulation unit 5 and the like, wherein the effluent of the clarification unit 1 is connected with a heat medium inlet of the heat exchanger 2 and the ash melting device 3, a heat medium outlet of the heat exchanger 2 is connected with the mixed reaction unit 4 through a water cooling tower 9, and the effluent of the mixed reaction unit 4 is connected with the comprehensive regulation unit 5; industrial water enters a cold medium inlet of the heat exchanger 2, and a cold medium outlet of the heat exchanger 2 is connected with an ash melting device 3; a slurry outlet of the clarification unit 1 is connected with a filter pressing unit 7 through a slurry pump 6, and filtrate outlet water of the filter pressing unit 7 is connected with a water cooling tower 9; a flow regulating valve I8-1 is arranged between the heat exchanger 2 and the clarification unit 1; a flow regulating valve II 8-2 is also arranged between the heat exchanger 2 and the ashing equipment.
The clarifying unit 1 is a clarifying tank, the ash melting equipment 3 is an ash melting machine, the mixing reaction unit 4 is a mixing reaction tank, the comprehensive adjusting unit 5 is a comprehensive adjusting tank, and the filter pressing unit 7 is a filter press. Each unit module is the prior art.
The working principle of the utility model is as follows: high-heat saponified wastewater generated by enterprise operation firstly enters a clarification unit 1, bottom slurry is pumped into a filter pressing unit 7 through a slurry pump 6, treated filtrate and supernatant wastewater of the clarification unit 1 jointly serve as a heat medium to enter a heat exchanger 2, industrial water serves as a cold medium to enter the heat exchanger 2, and heated industrial water enters an ash melting device 3 for preparing lime milk after heat exchange; in addition, when the temperature of the industrial water after heat exchange is low due to the condition of over-low environmental temperature and the like, the saponified wastewater is mixed with the industrial water by adjusting the flow regulating valve I8-1 and the flow regulating valve II 8-2, so that the temperature of the industrial water is increased and the consumption of the industrial water is reduced. The saponified wastewater is further cooled by the cooling tower 9 after heat exchange by the heat exchanger 2 to reach a more proper reaction temperature, and then enters the mixed reaction unit 4. After the mixed reaction with the desulfurization wastewater, the liquid enters a comprehensive regulation unit 5 (including conventional regulation of various physical and chemical properties such as water quantity, water pressure and water quality), and then enters biochemical treatment.
Claims (4)
1. The linked lime milk preparation system for wastewater pretreatment is characterized by comprising a clarification unit (1), a heat exchanger (2), an ash melting device (3), a mixing reaction unit (4) and a comprehensive regulation unit (5), wherein the effluent of the clarification unit (1) is connected with a heat medium inlet of the heat exchanger (2) and the ash melting device (3), a heat medium outlet of the heat exchanger (2) is connected with the mixing reaction unit (4), and the effluent of the mixing reaction unit (4) is connected with the comprehensive regulation unit (5); industrial water enters a cold medium inlet of the heat exchanger (2), and a cold medium outlet of the heat exchanger (2) is connected with an ash melting device (3); the mud outlet of the clarification unit (1) is connected with a filter pressing unit (7) through a mud pump (6), and the filtrate outlet of the filter pressing unit (7) is connected with the heat medium inlet of the heat exchanger (2).
2. The linked lime milk preparation system for wastewater pretreatment according to claim 1, characterized in that a flow regulating valve I (8-1) is arranged between the heat exchanger (2) and the clarification unit (1); a flow regulating valve II (8-2) is also arranged between the heat exchanger (2) and the ashing equipment.
3. The linked lime milk preparation system for wastewater pretreatment is characterized by comprising a clarification unit (1), a heat exchanger (2), an ash melting device (3), a mixed reaction unit (4) and a comprehensive regulation unit (5), wherein the effluent of the clarification unit (1) is connected with a heat medium inlet of the heat exchanger (2) and the ash melting device (3), a heat medium outlet of the heat exchanger (2) is connected with the mixed reaction unit (4) through a water cooling tower (9), and the effluent of the mixed reaction unit (4) is connected with the comprehensive regulation unit (5); industrial water enters a cold medium inlet of the heat exchanger (2), and a cold medium outlet of the heat exchanger (2) is connected with an ash melting device (3); the mud outlet of the clarification unit (1) is connected with a filter pressing unit (7) through a mud pump (6), and the filtrate outlet of the filter pressing unit (7) is connected with a water cooling tower (9).
4. The linked lime milk preparation system for wastewater pretreatment according to claim 3, characterized in that a flow regulating valve I (8-1) is arranged between the heat exchanger (2) and the clarification unit (1); a flow regulating valve II (8-2) is also arranged between the heat exchanger (2) and the ashing equipment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122407787.1U CN216191557U (en) | 2021-09-30 | 2021-09-30 | Linkage lime milk preparation system for wastewater pretreatment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122407787.1U CN216191557U (en) | 2021-09-30 | 2021-09-30 | Linkage lime milk preparation system for wastewater pretreatment |
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| CN216191557U true CN216191557U (en) | 2022-04-05 |
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| CN202122407787.1U Active CN216191557U (en) | 2021-09-30 | 2021-09-30 | Linkage lime milk preparation system for wastewater pretreatment |
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