Salt precipitation tank of wastewater evaporative crystallization system
By installing a demister and pressure sensor inside the salt precipitation tank, the problem of foam affecting the steam compressor was solved, thus ensuring the stable operation of the steam compressor and the quality of the evaporating condensate.
Patent Information
- Application Number
- CN202520267804.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-19
- Publication Date
- 2026-02-13
- Estimated Expiration
- 2035-02-19
AI Technical Summary
The existing salt precipitation tank generates a large amount of foam during operation. The foam can easily enter the steam compressor with the secondary steam, affecting its stable operation and causing damage to the steam compressor. It also affects the quality of the evaporated condensate.
A demister is installed inside the salt precipitation tank. The foam is intercepted and punctured by a wire mesh structure, and the demister is cleaned by a flushing water pipe. Combined with a pressure sensor to monitor the liquid level, the foam is effectively removed.
It effectively eliminates foam in the salt precipitation tank, prevents foam from entering the steam compressor, ensures the stable operation of the steam compressor and the water quality of the evaporated condensate, and achieves continuous and stable evaporation and concentration process.
Smart Images
Figure CN223906571U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a salt precipitation tank technical field especially relates to a waste water evaporation crystallization system's salt precipitation tank. BACKGROUND
[0002] Evaporation crystallization system is important unit operation equipment in chemical industry, medicine, environmental protection and other fields, and its main function is to remove water in solution through evaporation, so that the solute reaches supersaturation state and crystallizes. In many evaporation crystallization systems, the salt precipitation tank as a key component plays a crucial role. However, the existing salt precipitation tank will produce a large amount of foam during operation, when the height of the foam is too high, these foams are easy to follow the secondary steam generated by the high temperature liquid into the subsequent steam compressor, thereby causing great influence on the continuous and stable operation of the steam compressor, even causing damage to the steam compressor, at the same time, it also leads to unqualified evaporation condensate water quality, affecting the whole treatment system.
[0003] Therefore, it is necessary to provide a waste water evaporation crystallization system's salt precipitation tank to overcome the above defects. CONTENT OF THE UTILITY MODEL
[0004] The utility model aims at providing a waste water evaporation crystallization system's salt precipitation tank, which aims at solving the problem of too much foam in the salt precipitation tank, thereby avoiding affecting the operation of the subsequent steam compressor.
[0005] In order to achieve the above purpose, the utility model provides a waste water evaporation crystallization system's salt precipitation tank, which comprises:
[0006] The tank body is provided with a secondary steam outlet on the upper side, and a liquid circulation outlet is arranged at the bottom;
[0007] The circulating pipe is arranged in the tank body, and the other end of the circulating pipe is arranged outside the tank body to form a liquid circulation inlet;
[0008] The defoamer is arranged on the upper side in the tank body, and is used for removing the foam in the tank body;
[0009] The high temperature liquid enters from the liquid circulation inlet, passes through the circulating pipe and enters the tank body, and then is discharged from the liquid circulation outlet; wherein the secondary steam outlet is used for discharging the secondary steam generated when the high temperature liquid evaporates.
[0010] In a preferred embodiment, the circulating pipe comprises a horizontal pipe penetrating in and out of the tank body, a vertical pipe arranged in the tank body, and an elbow pipe connecting the horizontal pipe and the vertical pipe; the liquid circulation inlet is arranged at one end of the horizontal pipe away from the elbow pipe; the top of the vertical pipe is connected with a baffle through a supporting pipe; wherein the high temperature liquid discharged from the top of the vertical pipe flows downward after being limited by the baffle.
[0011] In a preferred embodiment, the outer wall of the vertical pipe is provided with a plurality of support columns, which are fixed to the inner wall of the tank body away from one end of the vertical pipe.
[0012] In a preferred embodiment, the tank body comprises a first cylinder and a second cylinder connected together, a first conical shell arranged on the side of the first cylinder away from the second cylinder, and a second conical shell arranged on the side of the second cylinder away from the first cylinder; the liquid circulating outlet is arranged at the bottom of the second conical shell; the first cylinder and the second cylinder are connected by a connecting piece in a sealed and detachable manner.
[0013] In a preferred embodiment, the top of the first conical shell or the first cylinder is provided with a first manhole, and the second cylinder is provided with a second manhole.
[0014] In a preferred embodiment, the outer wall of the first cylinder is provided with a plurality of first lug supports, and the outer wall of the second cylinder is provided with a plurality of second lug supports.
[0015] In a preferred embodiment, the predetermined positions of the tank body are also provided with a demister flushing water port, which is provided with a flushing water pipe; flushing water entering through the demister flushing water port is sprayed towards the demister through the flushing water pipe to flush the demister.
[0016] In a preferred embodiment, the top of the tank body is provided with a plurality of lifting lugs, which are uniformly arranged around the tank body.
[0017] In a preferred embodiment, the predetermined positions of the tank body are each provided with a sight glass for observing the inside of the tank body; each of the sight glasses is correspondingly provided with a sight glass flushing water port for flushing water to flush the corresponding sight glass.
[0018] In a preferred embodiment, the top of the tank body is provided with a first pressure sensor and the bottom of the tank body is provided with a second pressure sensor; the first pressure sensor and the second pressure sensor are electrically connected to a differential pressure liquid level meter to monitor the liquid level of the tank body.
[0019] The salt separation tank of the wastewater evaporation crystallization system can eliminate excessive foam in the tank body, avoid the foam from entering the steam compressor with secondary steam to hinder the operation of the steam compressor, and ensure the quality of high-temperature and high-pressure saturated steam produced by the steam compressor. BRIEF DESCRIPTION OF DRAWINGS
[0020] 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.
[0021] Figure 1 A longitudinal half-sectional view of the salt precipitation tank of the wastewater evaporation crystallization system provided by this utility model;
[0022] Figure 2 for Figure 1 A top view of the salt precipitation tank in the wastewater evaporation and crystallization system shown.
[0023] Numbered in the diagram: 100, Salt precipitation tank of the wastewater evaporation and crystallization system;
[0024] 10. Tank body; 101. Liquid circulation outlet; 102. Secondary steam outlet; 103. First maintenance manhole; 104. Second maintenance manhole;
[0025] 11. First cylinder; 12. Second cylinder; 13. First conical shell; 14. Second conical shell; 15. Connector; 16. Lifting lug; 17. First lug-type support; 18. Second lug-type support;
[0026] 20. Circulation pipe; 201. Feed circulation inlet; 21. Horizontal pipe; 22. Vertical pipe; 23. Bend; 24. Support pipe; 25. Baffle; 26. Support column;
[0027] 30. Demister; 31. Demister flushing inlet; 32. Flushing water pipe; 41. First pressure sensor; 42. Second pressure sensor; 50. Sight glass; 51. Sight glass flushing inlet. Detailed Implementation
[0028] 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.
[0029] 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.
[0030] It should be further understood that the term "and / or" used in the utility model specification and the appended claims means any combination of one or more of the associated listed terms and all possible combinations, and includes these combinations.
[0031] In the embodiment of the utility model, a salt precipitation tank 100 of a wastewater evaporation crystallization system is provided for receiving high-temperature feed liquid in the evaporation crystallization system of wastewater treatment, evaporating the high-temperature feed liquid to make the salt in the feed liquid crystallize and precipitate, and being capable of discharging the secondary steam generated during evaporation to the outside, so that the steam compressor in the subsequent process compresses the secondary steam to obtain high-quality high-temperature high-pressure saturated steam, the high-temperature high-pressure saturated steam provides a heat source for feed liquid evaporation, and finally forms a complete evaporation concentration process.
[0032] As shown in Figure 1 With Figure 2 As shown, the salt precipitation tank 100 of the wastewater evaporation crystallization system comprises a tank body 10, a circulating pipe 20, and a demister 30.
[0033] Specifically, the middle part of the tank body 10 is in a cylindrical shape, which comprises a first cylinder 11 and a second cylinder 12 connected with each other, a first conical shell 13 arranged on the side of the first cylinder 11 away from the second cylinder 12, and a second conical shell 14 arranged on the side of the second cylinder 12 away from the first cylinder 11, so that the tank body 10 as a whole forms a structure with a cylindrical middle part and conical ends. The bottom of the second conical shell 14 is provided with a feed liquid circulating outlet 101, so that the crystallized salt accumulated at the bottom of the tank body 10 can be discharged with the saturated salt liquid, and then subjected to subsequent thickening, dewatering, and other treatment processes. The upper side of the tank body 10 is provided with a secondary steam outlet 102, so that the secondary steam generated during the evaporation of the high-temperature feed liquid can be discharged through the secondary steam outlet 102 and transported to the steam compressor in the subsequent process through a steam pipeline. The steam compressor forms high-quality high-temperature high-pressure saturated steam after compressing the secondary steam, which provides a heat source for feed liquid evaporation, and finally forms a complete evaporation concentration process. The use of the steam compressor for the secondary steam is relatively using external steam as a heat source, and most of the time the operation cost will be low (because the cost of external steam is generally higher than the power cost of the steam compressor).
[0034] The first cylinder 11 and the second cylinder 12 are sealingly and detachably connected through a connecting piece 15. The connecting piece 15 can include flange nuts, non-metallic gaskets, and other parts, so that the first cylinder 11 and the second cylinder 12 can be machined and transported respectively, reducing the difficulty, and being convenient to assemble when in use to realize a pry-on structure.
[0035] Further, the top of the tank body 10 is provided with a plurality of lifting lugs 16. The plurality of (two or more) lifting lugs 16 are evenly arranged around the tank body 10. The lifting lugs 16 are used in cooperation with a hoisting device to facilitate hoisting the entire tank body 10 during assembly. Among them, the plurality of lifting lugs 16 are evenly distributed and simultaneously act when hoisting to avoid excessive swinging of the tank body 10 when being righted.
[0036] Further, the top of the first conical shell 13 or the first cylinder body 11 is provided with a first manhole 103. The second cylinder body 12 is provided with a second manhole 104. The two manholes facilitate maintenance personnel to drill into the tank body 10 during maintenance, and are in a closed state during normal operation.
[0037] Further, in combination with Figure 2 As shown in the figure, the outer wall of the first cylinder body 11 is provided with a plurality of first lug supports 17. The outer wall of the second cylinder body 12 is provided with a plurality of second lug supports 18. The two lug supports are used to be fixed on other equipment to vertically fix the assembled tank body 10.
[0038] Further, the top of the tank body 10 is provided with a first pressure sensor 41 and the bottom is provided with a second pressure sensor 42. The first pressure sensor 41 and the second pressure sensor 42 are electrically connected with a differential pressure liquid level meter to monitor the liquid level of the tank body 10. It should be noted that the implementation principle of the differential pressure liquid level meter can refer to the prior art, and the present application will not be repeated here.
[0039] In the embodiment of the present application, one end of the circulating pipe 20 extends into the inside of the tank body 10, and the other end extends out of the tank body 10 to become a liquid circulating inlet 201. The liquid circulating inlet 201 is used for the high-temperature liquid to enter the tank body 10 through the circulating pipe 20.
[0040] Specifically, the circulating pipe 20 includes a horizontal pipe 21 extending through the inside and outside of the tank body 10, a vertical pipe 22 located in the tank body 10, and an elbow pipe 23 connecting the horizontal pipe 21 and the vertical pipe 22. Here, the elbow pipe 23 and the vertical pipe 22 are both located in the tank body 10.
[0041] The material liquid circulation inlet 201 is located at the end of the horizontal pipe 21 far from the elbow pipe 23. The top of the vertical pipe 22 is connected with a baffle 25 through a support pipe 24. The baffle 25 can be a curved surface plate bent downward. The high-temperature material liquid discharged from the top of the vertical pipe 22 is limited by the baffle 25 and flows downward, so that the high-temperature material liquid discharged from the vertical pipe 22 is prevented from spraying to the top of the tank body 10, thereby avoiding the secondary steam entraining the material liquid and affecting the quality of the secondary steam and the quality of the condensed water. It can be understood that, through the support of the support pipe 24, a plurality of flow channel structures for discharging the high-temperature material liquid are formed between the top edge of the vertical pipe 22 and the baffle 25, that is, the material liquid impacts the baffle 25 and spreads downward. The baffle 25 prevents the material liquid from being too high to affect the quality of the secondary steam and the quality of the condensed water, and the support pipe 24 makes the baffle 25 more stable.
[0042] Further, a plurality of support columns 26 are arranged on the outer wall of the vertical pipe 22. The support columns 26 can be uniformly arranged around the vertical pipe 22. The ends of the support columns 26 far from the vertical pipe 22 are fixed to the inner wall of the tank body 10, so that the vertical pipe 22 is fixed in the tank body 10, and the horizontal displacement of the circulation pipe 20 is avoided.
[0043] The high-temperature material liquid enters from the material liquid circulation inlet 201 and enters the tank body 10 through the circulation pipe 20, so that the evaporation and crystallization are performed, the salt (such as potassium chloride, sodium chloride, etc.) is crystallized and precipitated, and the precipitated crystallized salt is precipitated at the bottom of the tank body 10 and then discharged with the saturated salt liquid from the material liquid circulation outlet 101.
[0044] In the embodiment of the utility model, the defoamer 30 is arranged on the upper side in the tank body 10 and is used for removing the foam in the tank body 10. It should be noted that, due to the existence of the chemical components such as COD and alkalinity in the evaporation wastewater and the fluctuation of the liquid surface caused by the high-temperature material liquid entering from the circulation pipe 20 and impacting the tank body 10, a large amount of foam can be generated. If the foam is not treated, it will be high, and in severe cases, it will enter the steam compressor in the subsequent process along with the secondary steam. Lightly, it causes the steam compressor to "surge", that is, unstable operation, and heavily, it causes the steam compressor blade to be damaged, and at the same time, it affects the quality of the subsequent evaporation condensed water, causing the evaporation water to be unqualified. Therefore, the defoamer 30 can intercept and pierce the foam through the wire mesh structure.
[0045] Further, the preset position of the tank body 10 is also provided with a demister flushing water port 31. The demister flushing water port 31 is provided with a flushing water pipe 32, and the flushing water entering through the demister flushing water port 31 is sprayed to the demister 30 through the flushing water pipe 32 to flush the demister 30. It can be understood that the wire mesh structure of the demister 30 does not necessarily break the foam after intercepting the foam, so the surface may be contaminated with a large amount of foam or residual impurities formed after the foam is broken, at which time water droplets are sprayed to the demister 30 through the demister flushing water port 31 to defoam or clean the surface of the demister 30. The source of the flushing water is generally preheated evaporated raw water.
[0046] In some embodiments, the surface of the tank body 10 is provided with a plurality of sight glasses 50 at predetermined positions. The sight glass 50 is a transparent surface for observing the inside of the tank body 10, such as observing the operation of the demister 30, observing the high-temperature liquid spray of the circulating pipe 20, and the like. Each sight glass 50 is provided with a corresponding sight glass flushing water port 51. The sight glass flushing water port 51 is used to introduce flushing water to flush the corresponding sight glass 50, so as to avoid the situation that the surface of the sight glass 50 located inside the tank body 10 is blocked by foam or crystalline salt, causing the inside of the tank body 10 to be unable to be observed.
[0047] In summary, the salt separation tank 100 of the wastewater evaporation crystallization system provided by the utility model can eliminate excessive foam in the tank body 10 by arranging the demister 30 on the upper side of the tank body 10, avoid the foam from entering the steam compressor along with the secondary steam to hinder the operation of the steam compressor, and ensure the continuous stability of the evaporation and concentration process and the quality of the evaporated condensed water.
[0048] The utility model is not limited to the description in the specification and embodiments, and therefore, for those skilled in the art, other advantages and modifications can be easily realized, and the utility model is not limited to specific details, representative equipment and examples of drawings shown and described herein without departing from the spirit and scope of the general concept defined by the claims and equivalent ranges.
Claims
1. A salt separation tank of a wastewater evaporation crystallization system, characterized by, The utility model relates to a kind of high-temperature liquid level tank, including: Tank body;The upper side of the tank body is provided with secondary steam outlet, and is provided with liquid circulation outlet at bottom; Circulation pipe, one end of the circulation pipe extends into the tank body, and the other end extends outside the tank body to become liquid circulation inlet; Demister, the demister is arranged in the upper side of the tank body, for removing the foam in the tank body; High-temperature liquid enters from the liquid circulation inlet, and enters the tank body through the circulation pipe, and then is discharged from the liquid circulation outlet;Wherein, the secondary steam outlet is used for discharging secondary steam generated when high-temperature liquid evaporates.
2. The salt separation tank of the wastewater evaporation crystallization system according to claim 1, characterized in that, The circulation pipe includes horizontal pipe through inside and outside the tank body, vertical pipe located in the tank body and elbow pipe connecting the horizontal pipe and the vertical pipe;The liquid circulation inlet is located at one end of the horizontal pipe away from the elbow pipe;The top of the vertical pipe is connected with baffle through support pipe;Wherein, high-temperature liquid discharged through the top of the vertical pipe flows downward after being limited by the baffle.
3. The salt separation tank of the wastewater evaporation crystallization system according to claim 2, wherein The outer wall of the vertical pipe is provided with a plurality of support columns, and one end of the support column away from the vertical pipe is fixed to the inner wall of the tank body.
4. The salt separation tank of the wastewater evaporation crystallization system according to claim 1, wherein The tank body includes a first cylinder and a second cylinder connected, a first conic shell arranged on the side of the first cylinder away from the second cylinder, and a second conic shell arranged on the side of the second cylinder away from the first cylinder;The liquid circulation outlet is arranged at the bottom of the second conic shell;The first cylinder and the second cylinder are connected by a connecting piece.
5. The salt separation tank of the wastewater evaporation crystallization system according to claim 4, wherein The top of the first conic shell or the first cylinder is provided with a first manhole, and the second cylinder is provided with a second manhole.
6. The salt separation tank of the wastewater evaporation crystallization system according to claim 4, wherein The outer wall of the first cylinder is provided with a plurality of first lug supports, and the outer wall of the second cylinder is provided with a plurality of second lug supports.
7. The salt separation tank of the wastewater evaporative crystallization system of claim 1, wherein, A predetermined position of the tank body is also provided with a demister flushing water outlet, and the demister flushing water outlet is provided with a flushing water pipe, and the flushing water entering through the demister flushing water outlet is sprayed towards the demister through the flushing water pipe to flush the demister.
8. The salt separation tank of the wastewater evaporative crystallization system of claim 1, wherein, The top of the tank body is provided with a plurality of lifting lugs, and the plurality of lifting lugs are uniformly arranged around the tank body.
9. The salt separation tank of the wastewater evaporative crystallization system of claim 1, wherein, A plurality of predetermined positions of the tank body are provided with sight glasses, and the sight glasses are used to observe the inside of the tank body;Each of the sight glasses is provided with a sight glass flushing water outlet, and the sight glass flushing water outlet is used to flush the corresponding sight glass.
10. The salt crystallization tank of the wastewater evaporation crystallization system according to claim 1, wherein The top of the tank body is provided with a first pressure sensor, and the bottom is provided with a second pressure sensor, and the first pressure sensor and the second pressure sensor are electrically connected with differential pressure liquid level meter to monitor the liquid level of the tank body.