Frozen brine treatment device

Abstract

The utility model discloses a frozen brine treatment device which comprises a salt dissolving tank, a bag filter, an ultrafilter, a calcium oxide storage tank and a water pump. The device has the advantages that saline water in the saline water storage tank reacts with added calcium oxide after being fed into the salt dissolving tank, so that iron ions can be removed from the saline water, and the saline water is independently discharged into the salt dissolving tank for treatment and is isolated from a saline water freezing system, and the influence on a main system after the calcium oxide is added is avoided; and then the bag filter and the ultrafilter are matched for filtering, so that the total iron of the brine freezing system is reduced, a large amount of industrial water is prevented from being diluted and discharged, and the production cost and water resources are saved. And bag filtration and ultrafiltration are combined, so that the treatment load of the ultrafiltration can be reduced, the backwashing frequency of the ultrafiltration can be reduced, the efficiency can be improved, and the industrial water consumption can be further reduced.

Description

Technical fields:

[0001] This utility model relates to the field of frozen brine treatment technology, and more specifically to a frozen brine treatment device. Background technology:

[0002] In industries such as chemical and pharmaceutical manufacturing, -35℃ brine refrigeration systems are typically installed to meet the low-temperature requirements of specific processes. These systems use calcium chloride or other types of brine as the cooling medium to achieve a temperature of -35℃. Our company's -35℃ brine is mainly used for cooling hydrogen chloride and hydrochloric acid. After cooling and heat exchange, the brine is circulated and stored in a brine storage tank for later use. However, when the brine circulates through user equipment (hydrogen chloride and hydrochloric acid production equipment), leaks can cause the brine to become acidic, resulting in a rapid drop in pH. This corrosion of equipment and pipelines leads to a severe exceedance of the total iron content in the brine, making the wastewater difficult to treat and requiring large amounts of industrial water for dilution before discharge. Therefore, controlling and reducing the total iron content in the -35℃ brine refrigeration system is a pressing issue that needs to be addressed. Utility model content:

[0003] The purpose of this invention is to provide a frozen brine treatment device.

[0004] This utility model is implemented by the following technical solution: a frozen brine treatment device, comprising a brine tank, a bag filter, an ultrafilter, a calcium oxide storage tank, and a water pump. The outlet of the brine storage tank is connected to the brine tank via a drain pipe, and a drain control valve is installed on the drain pipe. The outlet of the calcium oxide storage tank is connected to the brine tank via a pipeline. A steam pipe and a compressed air pipe are connected to the brine tank. A steam control valve is installed on the steam pipe, and a compressed air control valve is installed on the compressed air pipe. The inlet of the water pump is connected to the brine tank. The outlet of the pool is connected, and the outlet of the water pump is divided into two paths. One path is connected to the inlet of the brine storage tank through a first branch pipe, and the other path is connected to the inlet of the bag filter through a second branch pipe. A first control valve is installed on the first branch pipe, and a bag filter inlet valve is installed on the second branch pipe. The outlet of the bag filter is connected to the feed inlet of the ultrafiltration unit through a connecting pipe, and the discharge outlet of the ultrafiltration unit is connected to the inlet of the brine storage tank through a reuse pipe. An ultrafiltration inlet valve and an ultrafiltration outlet valve are respectively installed on the connecting pipe and the reuse pipe.

[0005] Furthermore, the outlet of the bag filter is connected to the inlet of the brine tank via a circulation pipe, and a bag filter outlet valve is installed on the circulation pipe.

[0006] Furthermore, a pressure gauge and a pH analyzer are installed on the second branch pipe.

[0007] Furthermore, the outlet of the water pump is connected to the brine tank via a return pipe, and a return control valve is installed on the return pipe.

[0008] The advantages of this invention are as follows: After the brine from the brine storage tank is sent to the salt treatment tank, it reacts with the added calcium oxide, thereby removing iron ions from the brine. The iron ions are then discharged separately into the salt treatment tank for further treatment, isolating it from the brine refrigeration system and preventing the added calcium oxide from affecting the main system. Subsequently, filtration is performed using a combination of bag filters and ultrafiltration, reducing the total iron in the brine refrigeration system while avoiding the need for large amounts of industrial water dilution during discharge, thus saving production costs and water resources. Furthermore, the combination of bag filtration and ultrafiltration reduces the processing load on the ultrafiltration system and decreases the frequency of backwashing, contributing to improved efficiency and further reducing industrial water consumption. Attached image description:

[0009] Figure 1 This is a schematic diagram of the overall structure of this embodiment.

[0010] 1. Salt bath; 2. Bag filter; 3. Ultrafiltration unit; 4. Calcium oxide storage tank; 5. Water pump; 6. Brine storage tank; 7. Sewage pipe; 8. Sewage control valve; 9. Steam pipe; 10. Compressed air pipe; 11. Steam control valve; 12. Compressed air control valve; 13. First branch pipe; 14. Second branch pipe; 15. First control valve; 16. Bag filter inlet valve; 17. Connecting pipe; 18. Reuse pipe; 19. Ultrafiltration inlet valve; 20. Ultrafiltration outlet valve; 21. Circulation pipe; 22. Bag filter outlet valve; 23. Pressure gauge; 24. pH analyzer; 25. Return pipe; 26. Return control valve. Detailed implementation method:

[0011] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0012] like Figure 1As shown, a chilled brine treatment device includes a brine tank 1, a bag filter 2, an ultrafilter 3, a calcium oxide storage tank 4, and a water pump 5. The outlet of the brine storage tank 6 is connected to the brine tank 1 via a drain pipe 7, and a drain control valve 8 is installed on the drain pipe 7. The outlet of the calcium oxide storage tank 4 is connected to the brine tank 1 via a pipeline. The brine tank 1 is connected to a steam pipe 9 and a compressed air pipe 10. A steam control valve 11 is installed on the steam pipe 9, and a compressed air control valve 12 is installed on the compressed air pipe 10. The inlet of the water pump 5 is connected to the outlet of the brine tank 1. The outlet of water pump 5 is divided into two paths: one path connects to the inlet of brine storage tank 6 via a first branch pipe 13, and the other path connects to the inlet of bag filter 2 via a second branch pipe 14. A first control valve 15 is installed on the first branch pipe 13, and a bag filter inlet valve 16 is installed on the second branch pipe 14. The outlet of bag filter 2 is connected to the inlet of ultrafiltration membrane 3 via a connecting pipe 17, and the outlet of ultrafiltration membrane 3 is connected to the inlet of brine storage tank 6 via a return pipe 18. An ultrafiltration inlet valve 19 and an ultrafiltration outlet valve 20 are installed on the connecting pipe 17 and the return pipe 18, respectively. The outlet of bag filter 2 is connected to the inlet of brine treatment tank 1 via a circulation pipe 21, and a bag filter outlet valve 22 is installed on the circulation pipe 21. A pressure gauge 23 and a pH analyzer 24 are installed on the second branch pipe 14. The outlet of water pump 5 is connected to brine treatment tank 1 via a return pipe 25, and a return control valve 26 is installed on the return pipe 25.

[0013] Processing procedure:

[0014] S1: Open the drain pipe 7 to discharge the -35℃ brine stored in the brine storage tank 6 to the salt dissolving pool 1, and open the steam control valve 11 to heat the brine in the salt dissolving pool 1 to room temperature.

[0015] S2: Close the first control valve 15 and the ultrafiltration inlet valve 19, open the bag filter inlet valve 16 and the bag filter outlet valve 22, start the water pump 5, and the brine will circulate through the bag filter inlet valve 16, the bag filter 2, and the bag filter outlet valve 22 to the brine tank 1.

[0016] S3: Open the compressed air control valve 12 to introduce compressed air into the brine tank 1 to stir the brine inside. Add calcium oxide into the brine tank 1 through the calcium chloride storage tank 4. Observe the pH value of the pH analyzer 24 and adjust the pH value of the brine in the brine tank 1 to 8-9. The calcium oxide iron removal process is as follows:

[0017] CaO + H₂O = Ca(OH)₂

[0018] 2FeCl3+3Ca(OH)2=3CaCl2+2Fe(OH)3↓

[0019] S4: Observe pressure gauge 23. When the pressure stops rising and the brine in the brine tank 1 is relatively clear, ensure that the ultrafiltration backwash inlet valve and the ultrafiltration backwash outlet valve are closed. Open the ultrafiltration inlet valve 19 and the ultrafiltration outlet valve 20. Close the bag filter outlet valve 22. The calcium brine is then filtered by the ultrafiltration 3 and reused in the brine storage tank 6.

[0020] The precipitate of ferric hydroxide (Fe(OH)3) is removed by filtration through a bag filter and an ultrafiltration membrane module, and the CaCl2 supernatant is recycled back to the system, thereby reducing the consumption of anhydrous calcium chloride.

[0021] During S4, observe pressure gauge 23. When pressure gauge 23 rises to the first pressure limit, open bag filter outlet valve 22 for circulation, close ultrafiltration inlet valve 19 and ultrafiltration outlet valve 20, and open ultrafiltration backwash inlet valve and ultrafiltration backwash drain valve to backwash ultrafiltration 3.

[0022] During S4, observe pressure gauge 23. When the pressure gauge rises to the second pressure limit, open reflux control valve 26, close bag filter inlet valve 16, cut out bag filter 2, and replace the filter bag. After replacement, open bag filter inlet valve 16 again and close reflux control valve 26.

[0023] During the above process, if the water pump 5 outputs a large amount of water, the return control valve 26 or the first control valve 15 will be opened to allow some of the brine to flow back or be sent back to the brine storage tank 6, thereby achieving the purpose of regulating the system water volume.

[0024] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A refrigerated brine treatment apparatus, characterized by, It includes a brine tank, a bag filter, an ultrafiltration unit, a calcium oxide storage tank, and a water pump. The outlet of the brine storage tank is connected to the brine tank via a drain pipe, and a drain control valve is installed on the drain pipe. The outlet of the calcium oxide storage tank is connected to the brine tank via a pipeline. A steam pipe and a compressed air pipe are connected to the brine tank. A steam control valve is installed on the steam pipe, and a compressed air control valve is installed on the compressed air pipe. The inlet of the water pump is connected to the outlet of the brine tank. The outlet of the water pump is divided into two paths: one path is connected to the inlet of the brine storage tank via a first branch pipe, and the other path is connected to the inlet of the bag filter via a second branch pipe. A first control valve is installed on the first branch pipe, and a bag filter inlet valve is installed on the second branch pipe. The outlet of the bag filter is connected to the inlet of the ultrafiltration unit via a connecting pipe, and the outlet of the ultrafiltration unit is connected to the inlet of the brine storage tank via a reuse pipe. An ultrafiltration inlet valve and an ultrafiltration outlet valve are respectively installed on the connecting pipe and the reuse pipe.

2. A refrigerated brine treatment apparatus as defined in claim 1, wherein, The outlet of the bag filter is connected to the inlet of the brine tank via a circulation pipe, and a bag filter outlet valve is installed on the circulation pipe.

3. A refrigerated brine treatment apparatus as defined in claim 1, wherein, A pressure gauge and a pH analyzer are installed on the second branch pipe.

4. A refrigerated brine treatment apparatus as defined in claim 1, wherein, The outlet of the water pump is connected to the brine tank through a return pipe, and a return control valve is installed on the return pipe.

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