Anti-scaling device for seawater multi-effect evaporation and concentration system
By adding an appropriate amount of acid to the multi-effect evaporation and concentration system of seawater and using a gas recovery device, the problem of calcium carbonate scarring in the seawater evaporation system is solved, the evaporation efficiency and production capacity are improved, and cleaning time and waste of raw materials are reduced.
Patent Information
- Application Number
- CN202421003069.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-10
- Publication Date
- 2024-12-27
- Estimated Expiration
- 2034-05-10
AI Technical Summary
In the multi-effect evaporation and concentration system of seawater, scarring caused by calcium carbonate, the wall of the heating pipe and separator chamber are affected, which affects the heat transfer effect and seawater evaporation. The existing pickling system has low efficiency, large artificial errors, and high risk of pipeline blockage. question.
Design a scale-proof device, add appropriate amount of acid to the multi-effect evaporation and concentration system of seawater through acid storage tanks and metering pumps, adjust the pH value, inhibit the scarring of calcium carbonate, and use the gas recovery mechanism to absorb acid gas to improve the utilization rate of raw materials. and cleaning efficiency.
It effectively inhibits pipe scarring, improves heat exchange efficiency and production capacity, reduces scar cleaning time, and improves the operating efficiency and raw material utilization rate of the system.
Smart Images
Figure CN222250110U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of seawater treatment equipment, in particular to an anti-scaling device for a seawater multi-effect evaporation concentration system. Background Art
[0002] Since the production process of using heat energy to concentrate seawater was put into use, it has been possible to use concentrated seawater for salt production and refining, and to use the generated condensed water instead of desalted water for soda ash production, which has significant economic benefits. However, as the operation time increases, the heating tubes of each effect heating chamber and the walls and pipes of the separation chamber are scarred, and even some heating tubes are scarred and blocked, which greatly reduces the heat transfer effect of each effect heating chamber, and the operating load and seawater evaporation volume continue to decrease, seriously affecting the seawater evaporation and concentration effect of the multi-effect system. By analyzing the scarred samples, it was found that the main component was calcium carbonate. Therefore, how to inhibit the scarring of concentrated seawater during the evaporation process is a difficult problem that technicians in this field need to solve urgently.
[0003] The existing application number is CN200910246277.1, which is a pickling system for low-temperature multi-effect seawater desalination equipment, comprising: an acid tank, an acid adding pump, a cleaning main pipe, a cleaning liquid inlet valve, a sprayer, an inter-effect connecting pipe, a brine discharge pipe and a brine discharge pump; wherein the acid tank is connected to the cleaning main pipe through the acid adding pump, and the sprayers of each effect evaporator are connected in parallel to the cleaning main pipe through their own cleaning liquid inlet valves; when in use, when the scaling condition of the heat exchange tube bundle in the multi-effect evaporation and seawater concentration system meets the pickling requirements, the acid adding pump is started, and the pickling liquid is sprayed onto the heat exchange tube bundle through the cleaning main pipe and the sprayer to clean the dirt deposited on the heat exchange tube, and after the pickling liquid is cleaned, it is transported back to the cleaning main pipe through the brine discharge pump for cyclic use.
[0004] The existing technology has the following disadvantages when in use: 1. During pickling, each effect heating chamber needs to be emptied and cleaned when each effect heating chamber is not working, which reduces the efficiency of seawater evaporation and is not conducive to ensuring production; 2. During the operation of each effect evaporator, as the pipeline scars, the evaporation amount of seawater continues to decrease, the working efficiency of each effect pipeline continues to decrease, affecting production capacity; 3. It is necessary to manually confirm in advance whether pickling is required. If there is a manual error, pipeline blockage is likely to occur. Utility Model Content
[0005] In view of the deficiencies in the prior art, the purpose of the utility model is to provide an anti-scaling device for a seawater multiple-effect evaporation concentration system, which can effectively prevent scarring of pipelines during the operation of the multiple-effect evaporation concentration system and effectively improve the production capacity.
[0006] The technical solution adopted by the utility model to solve its technical problems is:
[0007] An anti-scaling device for a seawater multiple-effect evaporation and concentration system comprises an acid storage tank, an acid gas discharge pipe is arranged on the top of the acid storage tank, and is connected to a gas recovery mechanism through the acid gas discharge pipe, a first acid delivery pipe is connected to the acid storage tank, the other end of the first acid delivery pipe is connected to a liquid inlet end of a metering pump, a second acid delivery pipe is connected to a liquid outlet end of the metering pump, and the other end of the second acid delivery pipe is connected to a liquid inlet pipeline in the multiple-effect evaporation and concentration system.
[0008] Compared with the prior art, the utility model adopting the above technical solution has the following outstanding features:
[0009] In the production process, the utility model adds acid solution of a certain concentration and a certain proportion to the seawater multi-effect evaporation concentration system to adjust the pH value of the seawater in the production process, thereby inhibiting the formation of calcium carbonate scars, thereby ensuring the heat exchange efficiency of each effect heating chamber.
[0010] As a preferred embodiment, a further technical solution of the utility model is:
[0011] The metering pump comprises a first metering pump and a second metering pump, and the liquid inlet pipeline in the multi-effect evaporation concentration system comprises a heat exchanger liquid inlet pipe and a second-effect liquid inlet pipe or a first-effect liquid inlet pipe; the acid in the acid storage tank is pumped into the heat exchanger liquid inlet pipe through the first metering pump, and is pumped into the second-effect liquid inlet pipe or the first-effect liquid inlet pipe through the second metering pump; by adding acid to the raw seawater and evaporated seawater, the pH value of the raw material is reduced, the scarring of the pipeline is avoided to affect the production capacity, the time for cleaning the scarring is saved, and the efficiency is improved.
[0012] The gas recovery mechanism includes a seawater storage tank, an absorption tank and a liquid outlet pump. The acid gas discharge pipe is connected to the bottom of the absorption tank. A liquid distributor is provided in the absorption tank. The seawater in the seawater storage tank is pumped into the absorption tank through the liquid outlet pump and combined with the acid gas through the liquid distributor. Raw seawater is used to absorb the volatilized acid gas, which makes full use of the raw seawater and acid liquid and improves the raw material utilization rate.
[0013] A recovery pipe is also connected between the absorption tank and the seawater storage tank; the seawater that has absorbed the acid gas can flow back to the seawater storage tank through the recovery pipe to avoid waste of raw materials.
[0014] The liquid outlet end of the liquid outlet pump is connected to a delivery main pipe, a liquid distribution branch pipe is arranged on the delivery main pipe, the delivery main pipe is connected to the liquid inlet pipeline in the multiple-effect evaporation concentration system, and the liquid distribution branch pipe is connected to the absorption tank; it is convenient to transport the seawater in the seawater storage tank to the absorption tank and the multiple-effect evaporation concentration system.
[0015] A polypropylene ball ring packing layer is arranged at the lower side of the liquid distributor; the polypropylene ball ring has good filling performance, which can make full use of the surface area of the packing layer and improve the mass transfer effect. At the same time, the polypropylene ball ring has a large gas resistance per unit volume, which facilitates the full contact between seawater and acid gas, thereby achieving a better absorption effect.
[0016] The acid storage tank is connected with an acid injection pipe, and is connected to an acid discharge pump through the acid injection pipe, so as to facilitate the injection of acid into the acid storage tank.
[0017] A one-way breathing valve is installed on the top of the acid storage tank to ensure that the pressure inside the acid storage tank is consistent with the external atmospheric pressure.
[0018] A liquid level meter is installed on the acid storage tank to facilitate the monitoring of the liquid volume in the acid storage tank.
[0019] A manhole is provided on the acid storage tank for easy maintenance. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 It is a schematic structural diagram of the anti-scaling device in an embodiment of the utility model.
[0021] Explanation of the reference numerals in the accompanying drawings: 1. Acid storage tank; 2. Acid gas discharge pipe; 3. First acid delivery pipe; 4. First metering pump; 5. Second metering pump; 6. Seawater storage tank; 7. Absorption tank; 8. Liquid discharge pump; 9. Liquid distributor; 10. Recovery pipe; 11. Polypropylene ball ring packing layer; 12. Transport main pipe; 13. Liquid distribution branch pipe; 14. Acid injection pipe; 15. Acid unloading pump. DETAILED DESCRIPTION
[0022] The present invention is further described below in conjunction with specific embodiments, the purpose of which is only to provide a better understanding of the content of the present invention. Therefore, the examples given do not limit the protection scope of the present invention.
[0023] Embodiment 1, as Figure 1 As shown, this embodiment provides an anti-scaling device for a seawater multiple-effect evaporation concentration system, comprising an acid storage tank 1, an acid gas discharge pipe 2 is provided on the top of the acid storage tank 1, and is connected to a gas recovery mechanism through the acid gas discharge pipe 2; a first acid delivery pipe 3 is connected to the acid storage tank 1, the other end of the first acid delivery pipe 3 is connected to the liquid inlet end of the metering pump, the liquid outlet end of the metering pump is connected to the second acid delivery pipe, and the other end of the second acid delivery pipe is connected to the liquid inlet pipeline in the multiple-effect evaporation concentration system.
[0024] Embodiment 2: The metering pump in the previous embodiment includes a first metering pump 4 and a second metering pump 5, and the liquid inlet pipeline in the multiple-effect evaporation concentration system includes a heat exchanger liquid inlet pipe and a second-effect liquid inlet pipe or a first-effect liquid inlet pipe; the first metering pump 4 is used to pump acid into the heat exchanger liquid inlet pipe, and the second metering pump 5 is used to pump acid into the second-effect liquid inlet pipe or the first-effect liquid inlet pipe.
[0025] Specifically, the multi-effect evaporation concentration system in this embodiment is two sets of parallel multi-effect evaporation concentration systems: set A evaporation concentration system and set B evaporation concentration system. Seawater enters the feed pipe of set A three-effect heating chamber and the feed pipe of set B three-effect heating chamber through the heat exchanger, and the seawater enters the set A two-effect heating chamber and the set A one-effect heating chamber in sequence from the set A three-effect heating chamber, and the seawater enters the set B two-effect heating chamber and the set B one-effect heating chamber in sequence from the set B three-effect heating chamber. In this embodiment, one first metering pump 4 is provided, and two second metering pumps 5 are provided. The first metering pump 4 is connected to the liquid inlet pipe of the heat exchanger through a PPR hose, and the two second metering pumps 5 are respectively connected to the liquid inlet pipe of the first-effect heating chamber of set A and the liquid inlet pipe of the first-effect heating chamber of set B; part of the acid is pumped into the liquid inlet pipeline of the heat exchanger through the first metering pump 4, so that the pH value of the seawater mixed with the acid reaches 5.3±0.2, and the pH value of the seawater is increased to 8.0±0.2 after being heated and evaporated in the second-effect heating chamber of set A and the second-effect heating chamber of set B; the other part of the acid is pumped into the liquid inlet pipe of the first-effect heating chamber of set A and the liquid inlet pipe of the first-effect heating chamber of set B through the two second metering pumps 5, so that the pH value of the seawater entering the first-effect heating chamber of set A and the first-effect heating chamber of set B is reduced to 7.5±0.5, and the effect of inhibiting calcium carbonate scarring is achieved by making the seawater mixed with the acid weakly acidic or weakly alkaline.
[0026] Among them, according to the number of the first metering pump 4 and the second metering pump 5, whether the second metering pump 5 is connected to the second-effect heating chamber liquid inlet pipe or the first-effect heating chamber liquid inlet pipe can be freely selected by those skilled in the art.
[0027] Furthermore, the device can be used in conjunction with an online pH detector to monitor the pH value of the solution in each pipeline, thereby regulating the mixing ratio of seawater and acid.
[0028] Embodiment 3, on the basis of embodiment 1, the gas recovery mechanism comprises a seawater storage tank 6, an absorption tank 7 and a liquid outlet pump 8; the absorption tank 7 is a cylindrical structure; the acid gas discharge pipe 2 is connected to the bottom of the absorption tank 7, and a liquid distributor 9 is provided in the absorption tank 7; a recovery pipe 10 is also connected between the absorption tank 7 and the seawater storage tank 6, and the connection position between the recovery pipe 10 and the absorption tank 7 is located at the bottom of the absorption tank 7; the seawater in the seawater storage tank 6 is pumped into the absorption tank 7 through the liquid outlet pump 8, and is combined with the acid gas through the liquid distributor 9, and then flows back to the seawater storage tank 6 through the recovery pipe 10.
[0029] The gas recovery mechanism can effectively absorb the acid mist discharged during storage and acid treatment to prevent the acid mist from harming the health of workers or damaging equipment. At the same time, the use of seawater to absorb hydrochloric acid can allow the acid to be reused to avoid waste of raw materials.
[0030] Furthermore, the liquid outlet end of the liquid outlet pump 8 is connected to a delivery main pipe 12, and a liquid distribution branch pipe 13 is provided on the delivery main pipe 12; the delivery main pipe 12 is connected to the liquid inlet pipe of the heat exchanger in the multiple-effect evaporation concentration system, and the liquid distribution branch pipe 13 is connected to the absorption tank 7; it is convenient to transport the seawater in the seawater storage tank 6 to the absorption tank 7 and the multiple-effect evaporation concentration system.
[0031] Furthermore, a polypropylene ball ring packing layer 11 is provided at the lower side of the liquid distributor 9; the polypropylene ball ring has good filling performance, and can make full use of the surface area of the packing layer to improve the mass transfer effect. At the same time, the polypropylene ball ring has a large gas resistance per unit volume, which is convenient for the seawater to fully contact with the acid gas, thereby achieving a better absorption effect.
[0032] Furthermore, the acid storage tank 1 is an elliptical barrel structure, and manholes are provided on the top and bottom of the acid storage tank 1; at the same time, a one-way breathing valve is provided on the top of the acid storage tank 1 to ensure that the atmospheric pressure inside the acid storage tank 1 is consistent with that outside; a liquid level gauge port is provided at the bottom of the acid storage tank 1 and is equipped with a liquid level gauge, and an openable sewage outlet is also provided at the bottom to facilitate the discharge of acid liquid.
[0033] Furthermore, the acid storage tank 1 is connected with an acid injection pipe 14, and is connected to an acid unloading pump 15 through the acid injection pipe 14; a certain liquid level of concentrated hydrochloric acid is stored in the acid storage tank 1, and when the liquid level meter detects that the liquid level of the concentrated hydrochloric acid is too low, the liquid inlet end of the acid unloading pump 15 is connected to the acid transport vehicle, and the acid unloading pump 15 is turned on to inject concentrated hydrochloric acid into the acid storage tank 1 to meet the production demand; wherein the concentrated hydrochloric acid is 31% concentrated hydrochloric acid.
[0034] The above description is only a preferred feasible embodiment of the present utility model, and does not limit the scope of rights of the present utility model. All equivalent changes made using the contents of the present utility model specification and its drawings are included in the scope of rights of the present utility model.
Claims
1. An anti-scaling device for a seawater multiple-effect evaporation concentration system, comprising an acid storage tank, an acid gas discharge pipe is provided on the top of the acid storage tank, and the acid gas discharge pipe is connected to a gas recovery mechanism, characterized in that: The acid storage tank is connected to a first acid pipe, the other end of which is connected to the liquid inlet of a metering pump, the liquid outlet of the metering pump is connected to a second acid pipe, and the other end of the second acid pipe is connected to the liquid inlet pipeline in the multiple-effect evaporation concentration system.
2. The anti-scaling device for a seawater multiple-effect evaporation concentration system according to claim 1, characterized in that: The metering pump comprises a first metering pump and a second metering pump, and the liquid inlet pipeline in the multi-effect evaporation concentration system comprises a heat exchanger liquid inlet pipe and a second-effect liquid inlet pipe or a first-effect liquid inlet pipe; the acid in the acid storage tank is pumped into the heat exchanger liquid inlet pipe through the first metering pump, and is pumped into the second-effect liquid inlet pipe or the first-effect liquid inlet pipe through the second metering pump.
3. The anti-scaling device for a seawater multiple-effect evaporation concentration system according to claim 1, characterized in that: The gas recovery mechanism includes a seawater storage tank, an absorption tank and a liquid outlet pump. The acid gas discharge pipe is connected to the bottom of the absorption tank. A liquid distributor is provided in the absorption tank. The seawater in the seawater storage tank is pumped into the absorption tank through the liquid outlet pump and combined with the acid gas through the liquid distributor.
4. The anti-scaling device for a seawater multiple-effect evaporation concentration system according to claim 3 is characterized in that: A recovery pipe is also connected between the absorption tank and the seawater storage tank.
5. The anti-scaling device for the seawater multiple-effect evaporation concentration system according to claim 4 is characterized in that: The liquid outlet end of the liquid outlet pump is connected to a delivery main pipe, a liquid distribution branch pipe is arranged on the delivery main pipe, the delivery main pipe is connected to the liquid inlet pipeline in the multi-effect evaporation concentration system, and the liquid distribution branch pipe is connected to the absorption tank.
6. The anti-scaling device for a seawater multiple-effect evaporation concentration system according to claim 3, characterized in that: A polypropylene ball ring packing layer is arranged on the lower side of the liquid distributor.
7. The anti-scaling device for a seawater multiple-effect evaporation concentration system according to claim 1, characterized in that: The acid storage tank is connected with an acid injection pipe, and is connected to the acid unloading pump through the acid injection pipe.
8. The anti-scaling device for a seawater multiple-effect evaporation concentration system according to claim 1, characterized in that: A one-way breathing valve is provided on the top of the acid storage tank.
9. The anti-scaling device for a seawater multiple-effect evaporation concentration system according to claim 1, characterized in that: A liquid level gauge is provided on the acid storage tank.
10. The anti-scaling device for a seawater multiple-effect evaporation concentration system according to claim 1, characterized in that: A manhole is provided on the acid storage tank.