Three-effect and four-effect combined evaporation system for sewage pretreatment
By using forced evaporators as three- and four-effect heaters in high-salt wastewater treatment systems, the thermal efficiency and stability problems caused by salting out and scaling of the equipment are solved, and the efficient operation and long-term stability of the equipment are achieved.
Patent Information
- Application Number
- CN202422442226.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-10
- Publication Date
- 2025-08-12
- Estimated Expiration
- 2034-10-10
AI Technical Summary
Existing high-salt wastewater treatment equipment is prone to reduced thermal efficiency due to salting and scaling, equipment corrosion and blockage, affecting the stability of the production system.
Forced evaporators are used as three- and four-effect heaters to improve heat transfer efficiency, enhance the equipment's anti-salting and scaling capabilities, and reduce maintenance and cleaning frequency.
Improves evaporation efficiency, extends the operation stability of equipment, reduces maintenance and cleaning frequency, and improves production efficiency.
Smart Images
Figure CN223213868U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field related to desalination, in particular to a three-effect and four-effect combined evaporation system for sewage pretreatment. Background Art
[0002] In industries such as chemical industry, hazardous waste incineration, petroleum refining, textile and food processing, high-salt wastewater is usually generated during the production process. These high-salt wastewaters contain high concentrations of salt, generally including various organic and inorganic compounds such as sodium chloride, sodium sulfate, sodium nitrate, etc. If these wastewaters are discharged directly, they will have a certain impact on the environment.
[0003] The main technologies currently used to treat this type of high-salt wastewater include mechanical compression evaporation (MVR) and multiple-effect evaporation (MED). Both technologies are based on the principle of evaporation. The existing technology generally adopts triple-effect evaporation technology, which heats the wastewater to separate dissolved salts and other non-volatile substances from the water to form salt crystals and other solids. These salt crystals and other solids easily form scale on the inner surface of the heat exchanger, resulting in reduced thermal efficiency and may even cause equipment blockage, which will cause certain corrosion and damage to the equipment, and ultimately may lead to instability or even paralysis of the entire production system. Utility Model Content
[0004] The purpose of the utility model is to provide a three-effect and four-effect combined evaporation system for sewage pretreatment, aiming to solve the above technical problems. The three-effect heater and the four-effect heater of the utility model adopt a forced evaporator, which has the advantages of large heat transfer coefficient, strong adaptability, easy cleaning, energy saving and high efficiency. It can not only accelerate the heat transfer process and improve the evaporation efficiency, but also resist salting out and scaling, reduce the frequency of maintenance and cleaning, and ensure the long-term stable operation of the equipment.
[0005] In order to achieve the above-mentioned purpose, the present invention is implemented through the following technical solutions:
[0006] A three-effect and four-effect combined evaporation system for sewage pretreatment comprises a three-effect heater, a three-effect separator, a four-effect heater and a four-effect crystallizer, wherein the wastewater inlet of the three-effect heater is connected to the three-effect separator through a pipeline, the dirty condensed water inlet of the three-effect heater is connected to the two-effect heater through a pipeline, the secondary steam inlet of the three-effect heater is connected to the two-effect separator through a pipeline, the non-condensable steam inlet of the three-effect heater is connected to the non-condensable steam tank through a pipeline, the wastewater outlet of the three-effect heater is connected to the three-effect separator through a pipeline, and the dirty condensed water outlet of the three-effect heater is connected to the four-effect heater through a pipeline.
[0007] Furthermore, the dirty condensate inlet of the triple-effect separator is connected to the dirty condensate pump through a pipeline, the wastewater outlet of the triple-effect separator is connected to the quadruple-effect heater through a pipeline, and the secondary steam outlet of the triple-effect separator is connected to the quadruple-effect heater.
[0008] Furthermore, the accident wastewater inlet of the four-effect heater is connected to the accident pool pump through a pipeline, the non-condensable steam inlet of the four-effect heater is connected to the non-condensable steam tank through a pipeline, the balanced steam inlet of the four-effect heater is connected to the dirty condensed water tank through a pipeline, the centrifugal mother liquor inlet of the four-effect heater is connected to the mother liquor pump through a pipeline, the wastewater outlet of the four-effect heater is connected to the four-effect crystallizer, and the dirty condensed water outlet of the four-effect heater is connected to the dirty condensed water tank through a pipeline. The three-effect heater and the four-effect heater use a forced evaporator. The forced evaporator has the advantages of large heat transfer coefficient, strong adaptability, easy cleaning, energy saving and high efficiency. It can not only accelerate the heat transfer process, thereby improving evaporation efficiency, but also can resist salting out and scaling, reduce the frequency of maintenance and cleaning, and ensure the long-term stable operation of the equipment.
[0009] Furthermore, the dirty condensate input port of the four-effect crystallizer is connected to the dirty condensate pump through a pipeline, the mother liquor input port of the four-effect crystallizer is connected to the four-effect circulation pipe through a pipeline, and the slurry output port of the four-effect crystallizer is connected to the sodium sulfate thickener through a pipeline.
[0010] Furthermore, a flow regulating valve is provided between the triple-effect heater and the secondary-effect separator.
[0011] Furthermore, a thermometer, a triple-effect circulation pump, a pressure gauge and an outward exhaust pipe are provided between the triple-effect separator and the triple-effect heater, a thermometer and a pressure gauge are provided between the triple-effect separator and the quadruple-effect heater, and a liquid level transmitter and three steam traps are also provided on the triple-effect separator.
[0012] Furthermore, a density regulating valve, a four-effect circulation pump, a flow regulating valve, a pressure gauge, a thermometer and an external drain pipe are provided between the four-effect heater and the four-effect crystallizer. When the liquid or gas in the pipeline does not meet expectations, the liquid or gas in the pipeline can be drained through the external drain pipe for subsequent processing.
[0013] Furthermore, a thermometer and a pressure gauge are provided between the four-effect crystallizer and the four-effect condenser. The four-effect crystallizer is provided with a liquid level transmitter, a thermometer and three steam traps. All kinds of data detectors can detect the response of the equipment in real time to ensure that the equipment can work stably for a long time.
[0014] The three-effect and four-effect combined evaporation system of the utility model for sewage pretreatment has the following beneficial effects:
[0015] 1. The three-effect and four-effect combined evaporation system for sewage pretreatment of the utility model adopts forced evaporators with large heat transfer coefficient and strong adaptability, which can not only accelerate the heat transfer process but also improve the evaporation efficiency;
[0016] 2. The three-effect and four-effect combined evaporation system for sewage pretreatment of the utility model has no complex internal structure of the three-effect separator and the four-effect crystallizer, which is easy to clean, resists salting out and scaling, reduces the frequency of maintenance and cleaning, and ensures the long-term stable operation of the equipment;
[0017] 3. The three-effect and four-effect combined evaporation system for sewage pretreatment of this utility model changes the original three-effect evaporation to four-effect evaporation, thereby improving the efficiency of sewage treatment and increasing the original sewage treatment capacity from 9.5t / h to 30t / h;
[0018] 4. The three-effect and four-effect combined evaporation system for sewage pretreatment of this utility model is equipped with various data detectors and valves on each system, making the system more perfect, reducing labor consumption and lowering production costs;
[0019] 5. The three-effect and four-effect combined evaporation system for sewage pretreatment of the present invention, if the original three-effect evaporation system is used to operate for 4 months, the heat exchange efficiency will be significantly reduced, and the system must be shut down for repairs, and related equipment must be cleaned with high pressure. The three-effect and four-effect combined evaporation system of the present invention has been in operation for 4 months and has not shown a significant decrease in heat exchange efficiency, which greatly improves production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 This is a schematic diagram of the overall system structure of a three-effect and four-effect combined evaporation system for sewage pretreatment in the utility model.
[0021] Figure 2 This is a piping code indication diagram in a three-effect and four-effect combined evaporation system for sewage pretreatment according to the utility model. DETAILED DESCRIPTION
[0022] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be described in further detail below with reference to the embodiments and accompanying drawings.
[0023] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be an intermediate element; when an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.
[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms used herein in the specification of this invention are intended solely for the purpose of describing specific embodiments and are not intended to limit this invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.
[0025] like Figure 1 and Figure 2 As shown, a three-effect and four-effect combined evaporation system for sewage pretreatment includes a three-effect heater 2, a three-effect separator 3, a four-effect heater 4 and a four-effect crystallizer 5. The wastewater inlet of the three-effect heater 2 is connected to the three-effect separator 3 through a pipeline, the dirty condensed water inlet of the three-effect heater 2 is connected to the two-effect heater 8 through a pipeline, the secondary steam inlet of the three-effect heater 2 is connected to the two-effect separator 1 through a pipeline, the non-condensable steam inlet of the three-effect heater 2 is connected to the non-condensable steam tank 7 through a pipeline, the wastewater outlet of the three-effect heater 2 is connected to the three-effect separator 3 through a pipeline, and the dirty condensed water outlet of the three-effect heater 2 is connected to the four-effect heater 4 through a pipeline.
[0026] like Figure 1 and Figure 2 As shown, the dirty condensate inlet of the triple-effect separator 3 is connected to the dirty condensate pump 9 through a pipeline, the wastewater outlet of the triple-effect separator 3 is connected to the quadruple-effect heater 4 through a pipeline, and the secondary steam outlet of the triple-effect separator 3 is connected to the quadruple-effect heater 4.
[0027] like Figure 1 and Figure 2 As shown, the accident wastewater inlet of the four-effect heater 4 is connected to the accident pool pump 14 through a pipeline, the non-condensable steam inlet of the four-effect heater 4 is connected to the non-condensable steam tank 7 through a pipeline, the balance steam inlet of the four-effect heater 4 is connected to the dirty condensed water tank 12 through a pipeline, the centrifugal mother liquor inlet of the four-effect heater 4 is connected to the mother liquor pump 15 through a pipeline, the wastewater outlet of the four-effect heater 4 is connected to the four-effect crystallizer 5, and the dirty condensed water outlet of the four-effect heater 4 is connected to the dirty condensed water tank 12 through a pipeline. The three-effect heater 2 and the four-effect heater 4 adopt a forced evaporator. The forced evaporator has the advantages of large heat transfer coefficient, strong adaptability, easy cleaning, energy saving and high efficiency. It can not only accelerate the heat transfer process, thereby improving evaporation efficiency, but also can resist salting out and scaling, reduce the frequency of maintenance and cleaning, and ensure the long-term stable operation of the equipment.
[0028] like Figure 1 and Figure 2As shown, the dirty condensate input port of the four-effect crystallizer 5 is connected to the dirty condensate pump 9 through a pipeline, the mother liquor input port of the four-effect crystallizer 5 is connected to the four-effect circulation pipe 11 through a pipeline, and the slurry output port of the four-effect crystallizer 5 is connected to the sodium sulfate thickener 6 through a pipeline.
[0029] like Figure 1 and Figure 2 As shown, a flow regulating valve 19 is provided between the triple-effect heater 2 and the secondary-effect separator 1 .
[0030] like Figure 1 and Figure 2 As shown, a thermometer 17, a triple-effect circulation pump 21, a pressure gauge 16 and an outward exhaust pipe 23 are provided between the triple-effect separator 3 and the triple-effect heater 2, a thermometer 17 and a pressure gauge 16 are provided between the triple-effect separator 3 and the quadruple-effect heater 4, and a liquid level transmitter 18 and three steam traps 13 are also provided on the triple-effect separator 3.
[0031] like Figure 1 and Figure 2 As shown, a density regulating valve 20, a four-effect circulation pump 22, a flow regulating valve 19, a pressure gauge 16, a thermometer 17 and an outward emptying pipe 23 are provided between the four-effect heater 4 and the four-effect crystallizer 5. When the liquid or gas in the pipeline does not meet expectations, the liquid or gas in the pipeline can be emptied through the outward emptying pipe 23 for subsequent processing.
[0032] like Figure 1 and Figure 2 As shown, a thermometer 17 and a pressure gauge 16 are provided between the four-effect crystallizer 5 and the four-effect condenser 10. The four-effect crystallizer 5 is provided with a liquid level transmitter 18, a thermometer 17 and three steam traps 13. The various data detectors can detect the reaction of the equipment in real time to ensure that the equipment can work stably for a long time.
[0033] It should be noted that: in this embodiment, the sodium sulfate wastewater after being treated by the second-effect separator 1 first reaches the triple-effect heater 2 from the second-effect separator 1 through a pipeline, is heated and then reaches the triple-effect separator 3 through a pipeline, and the separated sodium sulfate wastewater is transferred to the quadruple-effect heater 4 through the pipeline and the triple-effect circulation pump 21. After the quadruple-effect heating, the sodium sulfate wastewater is crystallized in the quadruple-effect crystallizer 5 through a pipeline, and the slurry after crystallization enters the sodium sulfate thickener 6 for subsequent processing; in this system, the dirty condensed water required for the operation of the triple-effect separator 3 and the quadruple-effect crystallizer 5 is directly provided by the dirty condensed water pump 9 through a pipeline, and the triple-effect heater 2 and the quadruple-effect heater The waste condensate required by the heater 4 is provided by the second-effect heater 8 through a pipeline. The waste condensate that finally flows to the fourth-effect heater 4 and the fourth-effect crystallizer 5 flows through a pipeline to the waste condensate tank 12. In this system, the secondary steam required by the triple-effect heater 2 is directly provided by the second-effect separator 1. After passing through the triple-effect heater 2, the secondary steam reaches the triple-effect separator 3 through a pipeline, then reaches the fourth-effect heater 4, then reaches the fourth-effect crystallizer 5, and finally reaches the fourth-effect condenser 10. In this system, the non-condensable steam tank 7 provides the non-condensable steam required for the system's operation, the emergency tank pump 14 provides processable emergency water to the fourth-effect heater 4, and the balance gas is transmitted from the waste condensate tank 12 to the fourth-effect heater 4 through a pipeline. The mother liquor pump 15 provides the centrifuged sodium sulfate wastewater mother liquor required for the reaction to the fourth-effect heater 4, and the fourth-effect circulation pipe 11 provides mother liquor to the fourth-effect crystallizer 5 through a pipeline.
[0034] It should be noted that: in this embodiment, high-salt wastewater is transferred from the flash feed pump 1 to the first effect heater 2 through the first main conveying pipeline 101, and after the first effect heating, it is transferred to the second effect heater 3 through the second main conveying pipeline 102, and finally the high-salt wastewater is transferred to the subsequent treatment device 4 through the third main conveying pipeline 103; the first effect heater 2 and the second effect heater 3 require steam and condensate during the working process, and the required steam is provided to the first effect heater 2 by the low-pressure steam main pipe 8 through the first effect heater first pipeline 201. After the heating, a part of the high-salt wastewater is transferred to the first effect separator 5 through the first effect separator first pipeline 501. The separator can separate secondary steam from the high-salt wastewater and convey the secondary steam to the second effect heater 3 through the second effect separator second pipeline 502. The separated high-salt wastewater is then transferred to the first effect heater 2 for circulation through the first effect separator third pipeline 503, and the excess steam in the first effect heater 2 is conveyed by the first effect heater third pipeline 203 To the vent pipe 14, similarly, the high-salt wastewater is heated in the second-effect heater 3 and reacts with the secondary steam, and then passes through the first pipeline 601 of the second-effect separator to the second-effect separator 6, and the secondary steam is separated and passes through the second pipeline 602 of the second-effect separator to the subsequent treatment device 4. The separated high-salt wastewater passes through the third pipeline 603 of the second-effect separator and returns to the second-effect heater 3 for circulation; the condensed water is transferred from the main condensation pipeline 111 to the first-effect heater 2 through the second branch 113, and then passes through The fourth pipeline 204 of the first-effect heater is transmitted to the condensed water tank 7, the main condensation pipeline 111 transmits the condensed water to the first-effect separator 5 through the third branch 114, the main condensation pipeline 111 transmits the condensed water to the second-effect heater 3 through the fourth branch 115, and then transmits it to the second-effect separator 6 through the fifth branch 116, and then transmits the condensed water to the subsequent treatment device 4 through the first pipeline 301 of the second-effect heater. The condensed water pump 10 and the dirty condensed water pump 11 are connected through the main condensation pipeline 111.
[0035] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Any ordinary technician in the industry can smoothly implement the present invention as shown in the drawings and described above. However, any technician familiar with the profession can make some changes, modifications and equivalent changes made by using the technical content disclosed above without departing from the scope of the technical solution of the present invention, which are all equivalent embodiments of the present invention. At the same time, any equivalent changes, modifications and evolutions made to the above embodiments based on the essential technology of the present invention still belong to the technical solution of the present invention.
Claims
1. A three-effect and four-effect combined evaporation system for sewage pretreatment, characterized by: It includes a triple-effect heater, a triple-effect separator, a quadruple-effect heater and a quadruple-effect crystallizer. The wastewater inlet of the triple-effect heater is connected to the triple-effect separator through a pipeline, the dirty condensed water inlet of the triple-effect heater is connected to the second-effect heater through a pipeline, the secondary steam inlet of the triple-effect heater is connected to the second-effect separator through a pipeline, the non-condensable steam inlet of the triple-effect heater is connected to the non-condensable steam tank through a pipeline, the wastewater outlet of the triple-effect heater is connected to the triple-effect separator through a pipeline, and the dirty condensed water outlet of the triple-effect heater is connected to the quadruple-effect heater through a pipeline.
2. A three-effect and four-effect combined evaporation system for sewage pretreatment according to claim 1, characterized in that: The dirty condensate inlet of the triple-effect separator is connected to the dirty condensate pump through a pipeline, the wastewater outlet of the triple-effect separator is connected to the quadruple-effect heater through a pipeline, and the secondary steam outlet of the triple-effect separator is connected to the quadruple-effect heater.
3. The three-effect and four-effect combined evaporation system for sewage pretreatment according to claim 1 is characterized in that: The accident wastewater inlet of the four-effect heater is connected to the accident pool pump through a pipeline, the non-condensable steam inlet of the four-effect heater is connected to the non-condensable steam tank through a pipeline, the balance steam inlet of the four-effect heater is connected to the dirty condensed water tank through a pipeline, the centrifuged mother liquor inlet of the four-effect heater is connected to the mother liquor pump through a pipeline, the wastewater outlet of the four-effect heater is connected to the four-effect crystallizer, and the dirty condensed water outlet of the four-effect heater is connected to the dirty condensed water tank through a pipeline.
4. The three-effect and four-effect combined evaporation system for sewage pretreatment according to claim 1 is characterized in that: The dirty condensate input port of the four-effect crystallizer is connected to the dirty condensate pump through a pipeline, the mother liquor input port of the four-effect crystallizer is connected to the four-effect circulation pipe through a pipeline, and the slurry output port of the four-effect crystallizer is connected to the sodium sulfate thickener through a pipeline.
5. The three-effect and four-effect combined evaporation system for sewage pretreatment according to claim 1 is characterized in that: A flow regulating valve is provided between the triple-effect heater and the secondary-effect separator.
6. The three-effect and four-effect combined evaporation system for sewage pretreatment according to claim 1, characterized in that: A thermometer, a triple-effect circulation pump, a pressure gauge and an outward emptying pipe are provided between the triple-effect separator and the triple-effect heater. A thermometer and a pressure gauge are provided between the triple-effect separator and the quadruple-effect heater. A liquid level transmitter and three steam traps are also provided on the triple-effect separator.
7. The three-effect and four-effect combined evaporation system for sewage pretreatment according to claim 1, characterized in that: A density regulating valve, a four-effect circulation pump, a flow regulating valve, a pressure gauge, a thermometer and an outward emptying pipe are arranged between the four-effect heater and the four-effect crystallizer.
8. The three-effect and four-effect combined evaporation system for sewage pretreatment according to claim 1, characterized in that: A thermometer and a pressure gauge are provided between the four-effect crystallizer and the four-effect condenser, and a liquid level transmitter, a thermometer and three steam traps are provided on the four-effect crystallizer.