Flushing water pipeline structure for wastewater evaporative crystallization system
By designing a flushing water pipeline structure that combines cold and hot water trunk lines, the problems of pipeline deposition and scaling in the wastewater evaporation and crystallization system were solved, achieving both cold and hot water flushing and improving system stability and equipment protection.
Patent Information
- Application Number
- CN202520267805.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-19
- Publication Date
- 2026-02-10
- Estimated Expiration
- 2035-02-19
AI Technical Summary
Existing wastewater evaporation crystallization systems are prone to biological material deposition and scaling in their pipelines. Cold water or hot water flushing each has its drawbacks, and it is impossible to achieve both cold and hot water flushing at the same time. Furthermore, hot water flushing may damage the equipment.
Design a flushing water pipeline structure that connects to different raw water trunks via cold and hot water trunks, utilizes the heat from condensate to achieve cold and hot water flushing, and combines cold water control valves and hot water control valves for selective flushing.
It achieves simultaneous cold and hot water rinsing functions, avoiding energy waste, protecting equipment, and improving system operational stability.
Smart Images
Figure CN223892476U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of wastewater treatment technology, and in particular to a flushing water pipeline structure for a wastewater evaporation and crystallization system. Background Technology
[0002] With the rapid development of my country's industry, a large amount of high-salinity wastewater is generated during industrial production. This type of wastewater is highly corrosive, biodegradable, and environmentally polluting. Traditional wastewater treatment methods are insufficient to meet the treatment requirements of high-salinity wastewater. One approach is to use evaporation crystallization technology to evaporate the salt from the wastewater, achieving water-salt separation. However, during the evaporation crystallization process, material deposits and scaling easily form on the inner walls of pipes, reducing the flow area, increasing resistance, and affecting the normal operation of the system. Furthermore, the deposits may contain corrosive components, damaging the pipes. Therefore, regular hydraulic flushing of the entire system is necessary. However, current hydraulic flushing methods typically only use cold or hot water, resulting in weak dissolving power for some deposits, especially scale and certain organic matter.
[0003] In addition, rinsing with only cold water has another disadvantage: after the cold rinse water enters the system, it will disrupt the thermal balance of the evaporation system, especially small-capacity evaporation systems, which may cause insufficient secondary steam in the evaporation chamber, thus causing the steam compressor to experience "surging" and become unable to operate stably.
[0004] However, rinsing with hot water alone also has disadvantages: some equipment (such as salt centrifuges) cannot withstand high-temperature hot water rinsing, which may damage them.
[0005] Therefore, it is necessary to provide a flushing water pipeline structure for a wastewater evaporation and crystallization system to overcome the above-mentioned defects. Utility Model Content
[0006] The purpose of this invention is to provide a flushing water pipeline structure for a wastewater evaporation crystallization system, aiming to improve the problem that existing evaporation crystallization treatment systems cannot simultaneously have cold water flushing and hot water flushing functions.
[0007] To achieve the above objectives, this utility model provides a flushing water pipeline structure for a wastewater evaporation and crystallization system, comprising:
[0008] Raw water inlet pipe used to connect the raw water tank for evaporation and the horizontal tube heat exchanger;
[0009] Salt circulation pipeline for connecting the horizontal tube heat exchanger and the evaporation salt precipitation tank;
[0010] The pipeline used to receive the condensate water after heat exchange in the horizontal tube heat exchanger.
[0011] The raw water inlet pipeline includes a first raw water main for connecting the evaporation raw water tank, a second raw water main for connecting the horizontal tube heat exchanger, and a preheating pipeline located between the first raw water main and the second raw water main; the preheating pipeline exchanges heat with the condensate pipeline through the preheater.
[0012] The first raw water main is connected to a cold water flushing main, which is equipped with a cold water control valve; the second raw water main is connected to a hot water flushing main, which is equipped with a hot water control valve; both the cold water flushing main and the hot water flushing main are connected to a flushing pipeline; the flushing pipeline is used to connect to the flushing interface of a preset device or preset pipeline, and to draw water from the cold water flushing main or the hot water flushing main to perform cold water or hot water flushing on the preset device or preset pipeline.
[0013] In a preferred embodiment, the flushing pipeline includes a flushing main line and a first flushing branch line extending from the flushing main line; the flushing main line is connected to both the cold water flushing main line and the hot water flushing main line, and the end of the first flushing branch line away from the flushing main line is used to connect to a preset flushing interface of the evaporation salt precipitation tank to flush a preset part inside the evaporation salt precipitation tank.
[0014] In a preferred embodiment, the system further includes a slurry discharge pipeline for connecting the salt circulation pipeline to the thickener; the flushing pipeline also includes a second flushing branch branch extending from the flushing main pipeline; one end of the second flushing branch branch, away from the flushing main pipeline, is connected to a predetermined position of the slurry discharge pipeline to flush the slurry discharge pipeline.
[0015] In a preferred embodiment, the system further includes a supernatant overflow pipeline for connecting the thickener and the filtrate tank, a salt slurry discharge pipeline for connecting the thickener and the salt centrifuge, and a filtrate recovery pipeline for connecting the filtrate tank and the salt precipitation circulation pipeline. The flushing pipeline also includes a third flushing branch branch extending from the flushing main line. The end of the third flushing branch away from the flushing main line is connected to a predetermined position of the filtrate recovery pipeline to flush the filtrate recovery pipeline.
[0016] In a preferred embodiment, the flushing pipeline further includes a fourth flushing branch branch extending from the main flushing line; the end of the fourth flushing branch branch away from the main flushing line is connected to a preset position of the salt centrifuge to perform cold water flushing on the salt centrifuge.
[0017] In a preferred embodiment, the system further includes a centrifuge post-discharge liquid delivery pipeline for connecting the salt centrifuge and the filtrate tank; the flushing pipeline also includes a fifth flushing branch branch extending from the flushing main line; one end of the fifth flushing branch branch, away from the flushing main line, is connected to a preset position of the centrifuge post-discharge liquid delivery pipeline to flush the centrifuge post-discharge liquid delivery pipeline.
[0018] This utility model provides a flushing water pipeline structure for a wastewater evaporation and crystallization system. By connecting the cold water flushing main line to the first raw water main line, heat exchange is bypassed through a preheater, allowing cold water to be supplied to the flushing pipeline. The hot water flushing main line is connected to the second raw water main line, where the raw water has already been preheated by a preheater, thus supplying hot water to the flushing pipeline. The flushing pipeline can open or close the cold water control valve and hot water control valve according to the equipment or pipeline being flushed, enabling either cold or hot water flushing. Ultimately, the entire flushing water system possesses the advantages of both cold and hot water flushing. Furthermore, the hot water source does not require an additional heating device; instead, it fully utilizes the heat in the condensate pipeline, avoiding energy waste. Attached Figure Description
[0019] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.
[0020] Figure 1 This is a schematic diagram of the flushing water pipeline structure for a wastewater evaporation and crystallization system provided by this utility model.
[0021] Number 100 in the diagram: Structure of flushing water pipeline for wastewater evaporation and crystallization system;
[0022] 11. Raw water evaporation tank; 12. Salt evaporation tank; 13. Horizontal tube heat exchanger; 14. Condensate tank; 15. Thickener; 16. Salt centrifuge; 17. Filtration tank; 18. Preheater;
[0023] 1011. First raw water main; 1012. Second raw water main; 1013. Preheating pipeline; 102. Salt precipitation circulation pipeline; 103. Condensate pipeline; 105. Slurry discharge pipeline; 106. Supernatant overflow pipeline; 107. Salt slurry discharge pipeline; 108. Filtrate recovery pipeline; 109. Centrifuge post-spray liquid conveying pipeline;
[0024] 104. Main flushing route; 1041. First flushing branch; 1042. Second flushing branch; 1043. Third flushing branch; 1044. Fourth flushing branch; 1045. Fifth flushing branch; 1046. Sixth flushing branch;
[0025] 201. Cold water flushing main circuit; 202. Cold water control valve; 301. Hot water flushing main circuit; 302. Hot water control valve. Detailed Implementation
[0026] To make the objectives, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described in this specification are merely for explaining the present utility model and are not intended to limit the present utility model.
[0027] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.
[0028] It should also be further understood that the term "and / or" as used in this specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.
[0029] It should be noted that before describing the structure of this utility model in detail, some equipment in the wastewater evaporation and crystallization system that may be involved will be described:
[0030] Evaporation raw water tank 11: Used for receiving and storing high-salinity wastewater (raw water);
[0031] Evaporation salt precipitation tank 12: This is an evaporation crystallization device. High-temperature saline wastewater evaporates in the heating chamber at the bottom to form saturated saline wastewater. Then, it continues to evaporate to precipitate crystallized salt (such as sodium chloride, potassium chloride, etc.). The steam generated during the evaporation process (i.e., unsaturated secondary steam) is stored in the evaporation chamber at the top and then the secondary steam is sent to the steam compressor.
[0032] Steam compressor (not shown in the figure): used to compress secondary steam to obtain high-quality, high-temperature, high-pressure saturated steam;
[0033] Horizontal tube heat exchanger 13: used to exchange heat between the high temperature and high pressure saturated steam delivered by the steam compressor and the wastewater delivered by the evaporation raw water tank 11, so that the wastewater becomes high temperature wastewater before entering the evaporation salt precipitation tank 12;
[0034] Condensate tank 14: Used to receive high-temperature condensate (containing a large amount of heat) formed by the high-temperature and high-pressure saturated steam in the horizontal tube heat exchanger 13 after heat exchange.
[0035] Thickener 15: Used to receive saturated slurry containing crystalline salt discharged from evaporation salt precipitation tank 12, and to further precipitate the crystalline salt in the saturated slurry during the cooling process, thereby increasing the solid-liquid ratio; the crystalline salt usually accumulates at the bottom, and the upper middle part is the supernatant;
[0036] Salt centrifuge 16: used to separate the salt slurry discharged from the thickener 15 into solid and liquid components, to obtain centrifuge slurry and crystalline salt solid;
[0037] Filter tank 17: Used to receive the supernatant delivered by thickener 15. The supernatant will flow back to the horizontal tube heat exchanger 13 for heat exchange and then re-enter the evaporation and salt precipitation tank 12.
[0038] Preheater 18: such as a plate heat exchanger, used for countercurrent heat exchange between the high-temperature condensate supplied from the condensate tank 14 and the wastewater raw water supplied from the evaporation raw water tank 11.
[0039] In an embodiment of this utility model, a flushing water pipeline structure 100 for a wastewater evaporation crystallization system is provided, which is used to perform hydraulic flushing on the pipeline in the evaporation crystallization system to remove biological material deposits, scale, etc. on the inner wall of the pipeline, and also takes into account both cold water flushing and hot water flushing functions.
[0040] like Figure 1 As shown, the flushing water pipeline structure 100 for the wastewater evaporation crystallization system includes: a raw water inlet pipeline for connecting the raw water tank 11 and the horizontal tube heat exchanger 13; a salt precipitation circulation pipeline 102 for connecting the horizontal tube heat exchanger 13 and the salt precipitation tank 12; and a condensate pipeline 103 for receiving the condensate after heat exchange in the horizontal tube heat exchanger 13.
[0041] The salt precipitation circulation pipeline 102 includes two sections. One section connects the feed liquid inlet of the evaporation salt precipitation tank 12 to the horizontal tube heat exchanger 13 (defined as the first section, i.e.) at both ends. Figure 1 The upper half of the first section), and the two ends of the other section are respectively connected to the liquid outlet of the evaporation and salt precipitation tank 12 and the horizontal tube heat exchanger 13 (defined as the second section, i.e. Figure 1 (The lower half of the text).
[0042] Specifically, the raw water inlet pipeline includes a first raw water main 1011 for connecting the evaporation raw water tank 11, a second raw water main 1012 for connecting the horizontal tube heat exchanger 13, and a preheating pipeline 1013 located between the first raw water main 1011 and the second raw water main 1012. The preheating pipeline 1013 exchanges heat with the condensate pipeline 103 via the preheater 18. That is, the low-temperature raw water (i.e., cold water) transported by the evaporation raw water tank 11 through the first raw water main 1011 exchanges heat with the high-temperature condensate in the condensate pipeline 103 via the preheating pipeline 1013, thereby enabling the supply of hot water to the second raw water main 1012.
[0043] In this embodiment, the first raw water main 1011 is connected to a cold water flushing main 201, which is equipped with a cold water control valve 202. The cold water control valve 202 is used to control the on / off state of the cold water flushing main 201. The second raw water main 1012 is connected to a hot water flushing main 301, which is equipped with a hot water control valve 302. The hot water control valve 302 is used to control the on / off state of the hot water flushing main 301. Both the cold water flushing main 201 and the hot water flushing main 301 are connected to the flushing pipeline, thereby allowing cold water and hot water to be supplied to the flushing pipeline respectively.
[0044] The flushing line is used to connect to the flushing interface of the preset equipment or preset pipeline, and draws water from the cold water flushing main line 201 or the hot water flushing main line 301 to perform cold or hot water flushing on the preset equipment or preset pipeline.
[0045] Specifically, the flushing pipeline includes a flushing main line 104 and a first flushing branch line 1041 extending from the flushing main line 104. The flushing main line 104 is connected to both a cold water flushing main line 201 and a hot water flushing main line 301. The end of the first flushing branch line 1041 furthest from the flushing main line 104 is connected to a preset flushing interface of the evaporation salt precipitation tank 12 to flush preset parts inside the evaporation salt precipitation tank 12. For example, the evaporation salt precipitation tank 12 has multiple sight glasses (for observing the foam height, actual liquid level, etc. inside the tank) and a demister flushing water interface on its wall, with each sight glass corresponding to a sight glass flushing port. Therefore, by supplying cold or hot water through the first flushing branch line 1041, the corresponding sight glass can be cleaned through the sight glass flushing port to prevent it from being blocked by foam or crystallized salt; or the demister can be flushed through the demister flushing water interface to ensure the effectiveness of the demister.
[0046] Furthermore, the flushing water pipeline structure 100 for the wastewater evaporation crystallization system also includes a slurry discharge pipeline 105 for connecting the salt precipitation circulation pipeline 102 and the thickener 15. The slurry discharge pipeline 105 is connected to the second section of the salt precipitation circulation pipeline 102 and is used to discharge the saturated slurry containing crystallized salt in the second section and then transport it to the thickener 15.
[0047] Accordingly, the flushing pipeline also includes a second flushing branch 1042 extending from the flushing main line 104. The end of the second flushing branch 1042 away from the flushing main line 104 is used to connect to a preset position of the slurry discharge pipeline 105 to flush the slurry discharge pipeline 105.
[0048] Furthermore, the flushing water pipeline structure 100 for the wastewater evaporation crystallization system also includes a supernatant overflow pipeline 106 connecting the thickener 15 and the filter tank 17, a salt slurry discharge pipeline 107 connecting the thickener 15 and the salt centrifuge 16, and a filtrate recovery pipeline 108 connecting the filter tank 17 and the salt precipitation circulation pipeline 102. The supernatant overflow pipeline 106 is used to transport the supernatant overflowing from the upper part of the thickener 15 to the filter tank 17. The salt slurry discharge pipeline 107 is used to transport the salt slurry containing a large amount of crystalline salt accumulated at the bottom of the thickener 15 to the salt centrifuge 16. The filtrate recovery pipeline 108 is used to return the supernatant in the filter tank 17 to the first section of the salt precipitation circulation pipeline 102.
[0049] Accordingly, the flushing pipeline also includes a third flushing branch 1043 extending from the flushing main line 104. The end of the third flushing branch 1043 away from the flushing main line 104 is connected to a preset position of the filtrate recovery pipeline 108 to flush the filtrate recovery pipeline 108.
[0050] Furthermore, the flushing pipeline also includes a fourth flushing branch 1044 extending from the flushing main line 104. The end of the fourth flushing branch 1044 away from the flushing main line 104 is connected to a preset position of the salt centrifuge 16 to perform cold water flushing on the salt centrifuge 16.
[0051] Furthermore, the flushing water pipeline structure 100 for the wastewater evaporation and crystallization system also includes a centrifuge after-spinning liquid conveying pipeline 109 for connecting the salt centrifuge 16 and the filter tank 17. The centrifuge after-spinning liquid conveying pipeline 109 is used to convey the after-spinning liquid obtained after centrifugation by the salt centrifuge 16 to the filter tank 17.
[0052] Accordingly, the flushing pipeline also includes a fifth flushing branch 1045 extending from the flushing main line 104. The end of the fifth flushing branch 1045 away from the flushing main line 104 is connected to a preset position of the centrifuge post-split liquid delivery pipeline 109 to flush the centrifuge post-split liquid delivery pipeline 109.
[0053] It should also be noted that, to help readers distinguish between the evaporation and crystallization related pipelines and the flushing pipelines in the evaporation and crystallization system, Figure 1All flushing pipelines are shown in dashed lines for ease of understanding only and are not intended as specific limitations. Each pipeline and branch is equipped with a drive pump and valve device to realize the conveying function and corresponding on / off control. As a conventional technical means, this utility model does not elaborate on this, but it does not mean that these pump structures and valve devices do not exist.
[0054] The flushing water pipeline structure 100 for a wastewater evaporation and crystallization system provided by this utility model connects the cold water flushing main line 201 to the first raw water main line 1011, thus bypassing the preheater 18 for heat exchange and allowing cold water to be supplied to the flushing pipeline. The hot water flushing main line 301 is connected to the second raw water main line 1012; the raw water temperature is increased after passing through the preheater 18, allowing hot water to be supplied to the flushing pipeline. The flushing pipeline can open or close the cold water control valve 202 and the hot water control valve 302 according to the different equipment or pipelines to be flushed, thereby achieving either cold water or hot water flushing. Ultimately, the entire flushing water system possesses the advantages of both cold water and hot water flushing. Furthermore, the hot water source does not require an additional heating device; instead, it fully utilizes the heat in the condensate pipeline 103, avoiding energy waste.
[0055] This invention is not limited to the description in the specification and embodiments. Therefore, other advantages and modifications can be readily realized by those skilled in the art. Thus, without departing from the spirit and scope of the general concept as defined by the claims and their equivalents, this invention is not limited to the specific details, representative devices and illustrated examples shown and described herein.
Claims
1. A flushing water pipeline structure for a wastewater evaporation and crystallization system, characterized in that, include: Raw water inlet pipe used to connect the raw water tank for evaporation and the horizontal tube heat exchanger; Salt circulation pipeline for connecting the horizontal tube heat exchanger and the evaporation salt precipitation tank; The pipeline used to receive the condensate water after heat exchange in the horizontal tube heat exchanger. The raw water inlet pipeline includes a first raw water main for connecting the evaporation raw water tank, a second raw water main for connecting the horizontal tube heat exchanger, and a preheating pipeline located between the first raw water main and the second raw water main; the preheating pipeline exchanges heat with the condensate pipeline through the preheater. The first raw water main is connected to a cold water flushing main, which is equipped with a cold water control valve; the second raw water main is connected to a hot water flushing main, which is equipped with a hot water control valve; both the cold water flushing main and the hot water flushing main are connected to a flushing pipeline; the flushing pipeline is used to connect to the flushing interface of a preset device or preset pipeline, and to draw water from the cold water flushing main or the hot water flushing main to perform cold water or hot water flushing on the preset device or preset pipeline.
2. The flushing water pipeline structure for a wastewater evaporation and crystallization system as described in claim 1, characterized in that, The flushing pipeline includes a flushing main line and a first flushing branch line extending from the flushing main line; the flushing main line is connected to both the cold water flushing main line and the hot water flushing main line, and the end of the first flushing branch line away from the flushing main line is used to connect to a preset flushing interface of the evaporation salt precipitation tank to flush a preset part inside the evaporation salt precipitation tank.
3. The flushing water pipeline structure for a wastewater evaporation and crystallization system as described in claim 2, characterized in that, It also includes a slurry discharge pipeline for connecting the salt circulation pipeline and the thickener; the flushing pipeline also includes a second flushing branch branch connected from the flushing main line; the end of the second flushing branch branch away from the flushing main line is used to connect to a preset position of the slurry discharge pipeline to flush the slurry discharge pipeline.
4. The flushing water pipeline structure for a wastewater evaporation crystallization system as described in claim 3, characterized in that, It also includes a supernatant overflow pipeline for connecting the thickener and the filtrate tank, a salt slurry discharge pipeline for connecting the thickener and the salt centrifuge, and a filtrate recovery pipeline for connecting the filtrate tank and the salt precipitation circulation pipeline; the flushing pipeline also includes a third flushing branch branch connected from the flushing main line; the end of the third flushing branch away from the flushing main line is connected to a preset position of the filtrate recovery pipeline to flush the filtrate recovery pipeline.
5. The flushing water pipeline structure for a wastewater evaporation crystallization system as described in claim 4, characterized in that, The flushing pipeline also includes a fourth flushing branch branch extending from the main flushing line; the end of the fourth flushing branch branch away from the main flushing line is connected to a preset position of the salt centrifuge to perform cold water flushing on the salt centrifuge.
6. The flushing water pipeline structure for a wastewater evaporation crystallization system as described in claim 4, characterized in that, It also includes a centrifuge post-discharge liquid delivery pipeline for connecting the salt centrifuge and the filtrate tank; the flushing pipeline also includes a fifth flushing branch branch connected from the flushing main line; the end of the fifth flushing branch branch away from the flushing main line is connected to a preset position of the centrifuge post-discharge liquid delivery pipeline to flush the centrifuge post-discharge liquid delivery pipeline.