Brine treatment system

Abstract

The utility model belongs to the technical field of brine treatment, and relates to a brine treatment system which comprises a brine refining unit, a filtering unit and an ammonia removal unit, the brine refining unit is communicated with the salt well; the filtering unit comprises a first inorganic membrane, a second inorganic membrane and a third inorganic membrane which are sequentially connected in series in the flowing direction of brine, and the water outlet part of the second inorganic membrane flows back to the water inlet end of the first inorganic membrane; the ammonia removal unit is communicated with the water outlet end of the first inorganic membrane; the water outlet part of the second inorganic membrane flows back to the water inlet end of the first inorganic membrane to dilute brine at the water inlet end of the first inorganic membrane, so that the concentration of the brine at the water inlet end of the first inorganic membrane is reduced, the risk of forming a deposition layer on the surface of the first inorganic membrane is reduced, and the stability and reliability of the brine filtering system are improved; and the brine at the water outlet end of the second inorganic membrane is subjected to secondary filtration through the circulating filtration arrangement that the effluent part of the second inorganic membrane flows back to the first inorganic membrane, so that the resource utilization rate of the brine is increased.

Description

TECHNICAL FIELD

[0001] The utility model relates to brine treatment technical field, concretely relates to a brine treatment system. BACKGROUND

[0002] Brine treatment is an important link in chemical industry, food processing and environmental protection and many other fields, and the treatment effect of brine directly affects the quality and production cost of subsequent products. Efficient and environmentally friendly brine treatment system is of great significance for sustainable utilization of resources.

[0003] The prior art has certain research on brine treatment system, see patent literature with application number 202321511800.0, which discloses a high-salinity water treatment system, which comprises a coarse filter tank, the coarse filter tank is connected with a first filter protector through a first sand filter column, the first filter protector is connected with a nanofiltration device recovery tank through a nanofiltration device, the nanofiltration device recovery tank is connected with a RO reverse osmosis device through a second filter protector, the RO reverse osmosis device is connected with an evaporation centrifugal device through a RO reverse osmosis device recovery tank, and the evaporation centrifugal device is connected with a condensate water external delivery pipeline through an evaporation condensate tank. A U-shaped detachable filter screen is arranged in the first filter protector.

[0004] It can be seen that the use of components such as coarse filter tank, sand filter column, nanofiltration device, RO reverse osmosis device and evaporation centrifugal device in series realizes the gradual removal of impurities in high-salinity water. However, during initial filtration, the concentration of high-salinity water is high, and the solute concentration at the nanofiltration device is higher than that of the filtered brine, which causes the formation of a deposition layer at the water inlet end of the nanofiltration device, increases the flow resistance of the brine, and thus increases the operating pressure of the filtration system. SUMMARY

[0005] In order to solve the technical problem that the solute concentration at the nanofiltration device is higher than that of the filtered brine, which causes the formation of a deposition layer at the water inlet end of the nanofiltration device and increases the flow resistance of the brine, the utility model provides a brine treatment system.

[0006] The brine treatment system of the utility model, the water outlet part of the second inorganic membrane is backflowed to the water inlet end of the first inorganic membrane, the backflowing brine is mixed with the brine at the water inlet end of the first inorganic membrane, the brine at the water inlet end of the first inorganic membrane is diluted, thereby reducing the concentration of the brine at the water inlet end of the first inorganic membrane, reducing the risk of forming a deposition layer on the surface of the first inorganic membrane, and improving the stability and reliability of the brine filtration system. At the same time, through the circulation filtration setting of the backflow of the water outlet part of the second inorganic membrane to the first inorganic membrane, the brine at the water outlet end of the second inorganic membrane is filtered again, and the resource utilization rate of the brine is improved.

[0007] To solve the above technical problems, the utility model provides the following technical scheme:

[0008] A brine treatment system, comprising a brine refining unit, a filtration unit and an ammonia removal unit arranged in series along a brine flow direction; the brine refining unit is in communication with a salt well, and is configured to receive and preliminarily treat brine from the salt well; the filtration unit comprises a first inorganic membrane, a second inorganic membrane and a third inorganic membrane arranged in series along the brine flow direction, the first inorganic membrane is in communication with an outlet of the brine refining unit, an outlet of the second inorganic membrane is backflowed to an inlet of the first inorganic membrane, and the filtration pore sizes of the first inorganic membrane, the second inorganic membrane and the third inorganic membrane decrease in turn; the ammonia removal unit is in communication with an outlet of the third inorganic membrane, and is configured to perform ammonia removal treatment on the water discharged from the third inorganic membrane.

[0009] In an embodiment, the filtration unit further comprises a filtration circulation tank, the filtration circulation tank is in communication with the outlet of the second inorganic membrane and the inlet of the first inorganic membrane respectively, and is configured to temporarily store and adjust the flow of the brine backflowed to the first inorganic membrane.

[0010] In an embodiment, the filtration unit further comprises a brine coarse filter, the brine coarse filter is in communication with the brine refining unit and the first inorganic membrane respectively, and is configured to perform primary filtration on the brine.

[0011] In an embodiment, the filtration unit further comprises a salt sludge tank, the salt sludge tank is in communication with the third inorganic membrane, and the solid impurities trapped by the third inorganic membrane flow into the salt sludge tank.

[0012] In an embodiment, the brine refining unit comprises a baffle tank and a reaction tank arranged in series along the brine flow direction; the baffle tank is in communication with the outlet of the salt well, and the reaction tank is in communication with the inlet of the brine coarse filter.

[0013] In an embodiment, the ammonia removal unit comprises an ammonia removal tower, a security filter and a primary brine storage tank arranged in series along the brine flow direction; the ammonia removal tower is configured to perform spray deamination on the water discharged from the first inorganic membrane; the security filter is configured to perform fine filtration treatment on the water discharged from the ammonia removal tower; and the primary brine storage tank is configured to store the water discharged from the security filter.

[0014] In an embodiment, a fan is arranged in the ammonia removal tower.

[0015] In an embodiment, the ammonia removal unit further comprises a pipeline mixer, the pipeline mixer is in communication with the security filter and the primary brine storage tank respectively, and is configured to remove free chlorine from the water discharged from the security filter.

[0016] In one specific implementation scheme, the brine treatment system further includes a pretreatment unit, which includes a heat exchanger and a gas-liquid separator arranged in series along the brine flow direction; the heat exchanger is connected to the outlet of the brine well and is used to heat the brine well outlet; the gas-liquid separator is connected to the inlet of the baffle tank and is used to remove some of the combustible gases from the brine.

[0017] In one specific implementation, the baffle tank is provided with a refining agent; and the outlet of the reaction tank is provided with a pH adjuster.

[0018] In summary, this utility model has the following beneficial technical effects:

[0019] 1. In this utility model brine treatment system, the effluent from the second inorganic membrane is returned to the inlet of the first inorganic membrane. The returned brine mixes with the brine at the inlet of the first inorganic membrane, diluting the brine at the inlet of the first inorganic membrane. This reduces the concentration of the brine at the inlet of the first inorganic membrane, lowers the risk of deposit formation on the surface of the first inorganic membrane, and improves the stability and reliability of the brine filtration system. Simultaneously, the circulation filtration system, where the effluent from the second inorganic membrane is returned to the first inorganic membrane, performs secondary filtration on the brine at the effluent from the second inorganic membrane, improving the resource utilization rate of the brine.

[0020] 2. The brine treatment system of this utility model has a filter circulation tank set between the outlet end of the second inorganic membrane and the inlet end of the first inorganic membrane. This facilitates the temporary storage and regulation of the brine flow back to the first inorganic membrane through the filter circulation tank, thereby improving the stability and reliability of the brine filtration process. Attached Figure Description

[0021] Figure 1 This is a process flow diagram of the brine treatment system of this utility model.

[0022] Explanation of reference numerals in the attached diagram: 1. Freshwater tank; 2. Salt well; 3. Raw brine tank; 4. Baffle trough; 5. Reaction tank; 6. Filtration unit; 7. Salt mud tank; 8. Ammonia removal tower; 9. Primary brine storage tank; 10. Refining agent; 11. pH adjuster. Detailed Implementation

[0023] The technical solution of this utility model will be further explained and described below with reference to the accompanying drawings and embodiments, but this utility model is not limited to the embodiments described below.

[0024] The utility model aims at providing a brine treatment system, the water part of second inorganic membrane refluxes to the water inlet end of first inorganic membrane, and the brine of reflux brine mixes with the brine of first inorganic membrane water inlet end, dilutes the brine of first inorganic membrane water inlet end, thereby reduces the concentration of first inorganic membrane water inlet end brine, reduces the risk of forming the deposition layer on the surface of first inorganic membrane, improves the stability and reliability of brine filtration system, simultaneously, through the circulation filtration setting of the water part of second inorganic membrane refluxing to first inorganic membrane, the brine of second inorganic membrane water end is filtered secondly, improves the resource utilization of brine.

[0025] Embodiment 1:

[0026] Referring to Figure 1 A brine treatment system, comprising a brine refining unit, a filtration unit 6 and an ammonia removal unit which are sequentially communicated from front to back. The brine refining unit is communicated with a salt well 2, and is used for receiving and preliminarily processing the brine in the salt well 2, wherein the preliminary processing refers to removing large-particle impurities in the brine and preliminarily adjusting water quality. The filtration unit 6 comprises a first inorganic membrane, a second inorganic membrane and a third inorganic membrane which are sequentially and serially arranged along the flow direction of the brine, the first inorganic membrane is communicated with the water outlet end of the brine refining unit, the water outlet part of the second inorganic membrane is refluxed to the water inlet end of the first inorganic membrane, and the filtration pore diameters of the first inorganic membrane, the second inorganic membrane and the third inorganic membrane are sequentially reduced. The ammonia removal unit is communicated with the water outlet end of the third inorganic membrane, and is used for performing ammonia removal treatment on the water outlet of the third inorganic membrane.

[0027] Specifically, the operator first injects fresh water in the fresh water tank 1 into the salt well 2, the fresh water contacts with the minerals in the salt well 2, and the salt in the minerals is gradually dissolved into the fresh water, so that the brine rich in salt is obtained, and the brine is collected into the raw brine tank 3 for subsequent processing.

[0028] Referring to Figure 1 The brine refining unit comprises a baffle tank 4 and a reaction tank 5 which are serially arranged along the flow direction of the brine. The baffle tank 4 is communicated with the water outlet end of the raw brine tank 3, and the brine is preliminarily processed by adding a refining agent 10 into the baffle tank 4, the reaction tank 5 is communicated with the water inlet end of the brine coarse filter, and the reaction tank 5 is used for further chemical reaction of the water outlet of the baffle tank 4 to adjust water quality.

[0029] Further, the refining agent 10 is arranged in the baffle tank 4, and a pH adjuster 11 is arranged at the water outlet end of the reaction tank 5, and the pH value of the brine at the water outlet end of the reaction tank 5 is adjusted by the pH adjuster 11, so as to facilitate subsequent processing.

[0030] Specifically, the refining agent 10 can be sodium carbonate, sodium hydroxide or sodium hypochlorite, and the required refining agent 10 can be selected according to the main impurity ions in the brine; preferably, the refining agent 10 is selected to be a combination of sodium carbonate and sodium hypochlorite. The operating personnel add sodium carbonate and sodium hypochlorite into the baffle tank 4, the brine in the baffle tank 4 overflows into the reaction tank 5, and in the reaction tank 5, the sodium carbonate reacts with the calcium ions in the brine to generate calcium carbonate crystalline precipitate, and the sodium hypochlorite oxidizes and decomposes the organic matter in the brine and sterilizes, thereby improving the stability of the brine.

[0031] More specifically, the pH regulator 11 can be sodium carbonate, sodium hydroxide or calcium hydroxide, and by adding the pH regulator 11 at the outlet end of the reaction tank 5, the pH value of the brine flowing out of the outlet end of the reaction tank 5 can be brought to the required range; preferably, the pH regulator 11 is sodium hydroxide, which reacts with magnesium ions in the brine to generate magnesium hydroxide colloid precipitate, and at the same time, promotes the reaction of sodium hypochlorite and inorganic ammonia to generate nitrogen gas under alkaline conditions, thereby simultaneously achieving ammonia removal pretreatment.

[0032] Referring to Figure 1 , the filtering unit 6 further comprises a filtering circulating tank, a salt water coarse filter and a salt mud tank 7.

[0033] The filtering circulating tank is in communication with the outlet end of the second inorganic membrane and the inlet end of the first inorganic membrane respectively, and a gate valve is arranged at the outlet end of the filtering circulating tank, which is used to temporarily store and adjust the flow of brine flowing back to the first inorganic membrane, so as to ensure the stability and continuity of the brine filtering process.

[0034] The two ends of the salt water coarse filter are in communication with the salt water refining unit and the first inorganic membrane respectively, which is used to filter the brine for the first time, so as to further remove larger particulate impurities in the brine and protect the normal operation of the subsequent inorganic membrane.

[0035] The salt mud tank 7 is in communication with the third inorganic membrane, and the solid impurities intercepted by the third inorganic membrane flow into the salt mud tank 7; by arranging the salt mud tank 7, the solid impurities intercepted by the third inorganic membrane can be stored, so as to facilitate the secondary treatment of the collected solid impurities and improve the resource utilization rate.

[0036] Referring to Figure 1 , the ammonia removal unit comprises an ammonia removal tower 8, a security filter and a primary salt water storage tank 9 arranged in series along the flow direction of the brine. The ammonia removal tower 8 is used for spraying and removing ammonia from the outlet water of the third inorganic membrane; the security filter is used for filtering the outlet water of the ammonia removal tower 8; and the primary salt water storage tank 9 is used for storing the outlet water of the security filter.

[0037] Specifically, the security filter in the embodiment is a filtering device known to those skilled in the art, and the model of the security filter is not specifically limited, and an operator can select a security filter suitable for filtering high-salinity brine according to actual filtering precision requirements; in the embodiment, the model of the security filter is a PF-100 filter core.

[0038] Further, the ammonia removal tower 8 is provided with a fan, and forced ventilation of the fan promotes gas exchange in the spraying ammonia removal process, thereby improving the ammonia removal efficiency.

[0039] Further, the ammonia removal unit further comprises a pipeline mixer. The pipeline mixer is in communication with the security filter and the primary brine tank 9 at two ends, respectively, and the pipeline mixer is used to remove free chlorine in the water discharged from the security filter. By adding a reducing agent in the pipeline mixer, free chlorine in the brine is removed to avoid corrosion of the free chlorine on the subsequent treatment equipment. Specifically, the reducing agent is sodium bisulfite, which reduces the free chlorine in the brine while avoiding excessive influence of the sodium bisulfite on the composition of the brine.

[0040] Embodiment 2:

[0041] With reference to Figure 1 The brine treatment system in the embodiment further comprises a pretreatment unit on the basis of the embodiment 1, and the pretreatment unit comprises a heat exchanger and a gas-liquid separator arranged in series along the flow direction of the brine. The heat exchanger is in communication with the water outlet end of the salt well 2, and the heat exchanger is used to warm the water discharged from the salt well 2. The gas-liquid separator is in communication with the water inlet end of the baffle tank 4, and the gas-liquid separator is used to remove part of the combustible gas in the brine.

[0042] In the embodiment, the brine is warmed to 60-65℃ by the heat exchanger, which improves the chemical reaction rate in the subsequent brine treatment process, reduces the viscosity of the brine, and improves the filtering efficiency in the subsequent brine treatment process. The gas-liquid separator uses the centrifugal force generated by the tangential entry of the brine into the gas-liquid separator by the cyclone separation principle to eliminate the combustible gas such as CH4 and H2S in the dissolved state in the brine, thereby eliminating the risk of explosion in the subsequent brine treatment process.

[0043] The working principle of the brine treatment system is as follows: fresh water is injected into the salt well 2 to form brine, the brine enters the baffle tank 4 after buffering by the original brine tank 3; the refining agent 10 is mixed with the brine in the baffle tank 4 and forms a precipitate, and coarse-grained impurities are intercepted by the salt water coarse filter; the pH regulator 11 adjusts the pH of the brine to the required value at the water outlet end of the reaction tank 5, and forms magnesium hydroxide colloid, and sodium hypochlorite is decomposed into inorganic ammonia under alkaline conditions; the water outlet of the reaction tank 5 passes through the first inorganic membrane, the second inorganic membrane and the third inorganic membrane in turn, at the same time, the water outlet of the second inorganic membrane flows back to the water inlet end of the first inorganic membrane for secondary filtration; the water outlet of the third inorganic membrane enters the ammonia removal tower 8, the spray water in the ammonia removal tower 8 is countercurrently contacted with the water outlet of the third inorganic membrane, at the same time, the fan forcibly ventilates the ammonia removal tower 8 to improve the ammonia removal rate; the water outlet of the ammonia removal tower 8 flows through the security filter and the pipeline mixer in turn, and is finally stored in the primary salt water storage tank 9, and the treatment of the brine is completed.

[0044] The preferred embodiment of the utility model is not limited to the protection scope of the utility model, therefore: equivalent changes made according to the structure, shape and principle of the utility model should be covered in the protection scope of the utility model.

Claims

1. A brine treatment system, characterized in that: It includes a brine refining unit, a filtration unit (6), and an ammonia removal unit, which are connected in series along the brine flow direction; The brine refining unit is connected to the brine well (2) and is used to receive and preliminarily process the brine in the brine well (2); The filtration unit (6) includes a first inorganic membrane, a second inorganic membrane and a third inorganic membrane arranged in series along the brine flow direction. The first inorganic membrane is connected to the outlet of the brine purification unit. The outlet of the second inorganic membrane flows back to the inlet of the first inorganic membrane. The filtration pore size of the first inorganic membrane, the second inorganic membrane and the third inorganic membrane decreases in sequence. The ammonia removal unit is connected to the outlet of the third inorganic membrane, and the ammonia removal unit is used to remove ammonia from the effluent of the third inorganic membrane.

2. The brine treatment system according to claim 1, characterized in that: The filtration unit (6) also includes a filtration circulation tank; The filter circulation tank is connected at both ends to the outlet of the second inorganic membrane and the inlet of the first inorganic membrane, respectively. The filter circulation tank is used to temporarily store and regulate the flow rate of brine returning to the first inorganic membrane.

3. The brine treatment system according to claim 2, characterized in that: The filtration unit (6) also includes a brine coarse filter; The brine coarse filter is connected at both ends to the brine refining unit and the first inorganic membrane, respectively, and is used for the initial filtration of the brine.

4. The brine treatment system according to claim 3, characterized in that: The filtration unit (6) also includes a salt mud tank (7); The salt mud tank (7) is connected to the third inorganic membrane, and the solid impurities trapped by the third inorganic membrane flow into the salt mud tank (7).

5. The brine treatment system according to claim 3, characterized in that: The brine refining unit includes a baffle tank (4) and a reaction tank (5) arranged in series along the brine flow direction; The baffle (4) is connected to the outlet of the salt well (2), and the reaction tank (5) is connected to the inlet of the brine coarse filter.

6. The brine treatment system according to any one of claims 1 to 5, characterized in that: The ammonia removal unit includes an ammonia removal tower (8), a security filter, and a primary brine storage tank (9) arranged in series along the brine flow direction; The ammonia removal tower (8) is used to spray ammonia removal onto the effluent from the third inorganic membrane. The security filter is used to filter the effluent from the ammonia removal tower (8); The primary brine storage tank (9) is used to store the effluent from the security filter.

7. The brine treatment system according to claim 6, characterized in that: A blower is installed inside the ammonia removal tower (8).

8. The brine treatment system according to claim 6, characterized in that: The ammonia removal unit also includes a pipeline mixer; The two ends of the pipeline mixer are connected to the security filter and the primary brine storage tank (9) respectively, and the pipeline mixer is used to remove free chlorine from the water effluent of the security filter.

9. The brine treatment system according to claim 5, characterized in that: The brine treatment system also includes a pretreatment unit, which includes a heat exchanger and a gas-liquid separator arranged in series along the brine flow direction. The heat exchanger is connected to the outlet of the salt well (2), and the heat exchanger is used to heat the water from the salt well (2). The gas-liquid separator is connected to the inlet end of the baffle (4), and the gas-liquid separator is used to remove some of the flammable gases in the brine.

10. The brine treatment system according to claim 5, characterized in that: The baffle (4) is provided with a refining agent (10); The outlet of the reaction tank (5) is equipped with a pH adjuster (11).

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