A production device for high-salt natural alkali brine heat pump wet decomposition and salt-alkali separation

Abstract

This utility model relates to the field of inorganic salt production and processing technology, and discloses a production device for heat pump wet decomposition and salt-alkali separation of high-salt natural alkaline brine. The device includes a pretreatment tank, which is equipped with a sand filter and a microporous filter. A carbonization component, including a carbonization reactor, is installed at the output end of the pretreatment tank. The input end of the carbonization reactor is fixedly connected to the output end of the pretreatment tank via a pipe. A U-shaped cooler is installed on one side of the carbonization reactor. In this utility model, pretreatment effectively removes insoluble substances from the natural alkaline brine, ensuring the purity of the carbonization product. The U-shaped cooler maintains the carbonization temperature, ensuring efficient reaction. After separation of the carbonization product, the mother liquor enters the wet decomposition system. The steam at the top of the tower forms a heat pump for energy saving, and the concentrated liquid at the bottom of the tower recovers sodium chloride, achieving efficient crystallization of sodium bicarbonate, sodium chloride recovery, and carbon dioxide recycling, reducing energy consumption and costs, and improving environmental friendliness.

Description

Technical Field

[0001] This utility model relates to the field of inorganic salt production and processing technology, specifically to a production device for heat pump wet decomposition and salt-alkali separation of high-salt natural alkaline brine. Background Technology

[0002] In the chemical production sector, the development and utilization of high-salt natural alkaline brine resources are crucial for the production of products such as soda ash and sodium chloride. The heat pump wet decomposition and salt-alkali separation production unit for high-salt natural alkaline brine is a key piece of equipment for processing these resources, and its technological development is directly related to resource utilization efficiency and enterprise economic benefits. A rational unit design and process can effectively improve product yield, reduce energy consumption and production costs, and has profound significance for promoting the sustainable development of the chemical industry.

[0003] Currently, traditional high-salinity natural alkaline brine treatment devices typically employ simple filtration and separation mechanical structures combined with conventional chemical decomposition reaction technology. In the pretreatment stage of natural alkaline brine, impurity removal generally relies solely on simple sedimentation tanks or coarse filters. During the carbonization reaction, effective temperature control methods are lacking, making it difficult to guarantee the stability and efficiency of the reaction. For mother liquor treatment, most systems lack a systematic recycling mechanism; the separation of sodium bicarbonate and sodium chloride often employs a single evaporation crystallization method, with carbon dioxide gas essentially being directly emitted without recycling.

[0004] However, existing technologies suffer from low resource utilization efficiency and high energy consumption in the natural alkaline brine treatment process. Due to the lack of sophisticated pretreatment equipment, insoluble substances in the brine are difficult to remove completely, affecting subsequent carbonization reactions; the reaction temperature is difficult to control precisely, resulting in low sodium bicarbonate crystallization efficiency; and the mother liquor treatment process lacks an effective recycling system, leading not only to a waste of carbon dioxide resources but also to the inability to fully extract recyclable resources such as sodium chloride, increasing production costs and creating significant environmental pollution pressure. Therefore, a more efficient and environmentally friendly treatment device is urgently needed. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a production device for heat pump wet decomposition and salt-alkali separation of high-salt natural alkaline brine, which solves the problems of low resource utilization efficiency and high energy consumption in the natural alkaline brine treatment process in existing technologies.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A production apparatus for heat pump wet decomposition and salt-alkali separation of high-salt natural alkaline brine includes a pretreatment tank. The pretreatment tank is equipped with a sand filter and a microporous filter. A carbonization component is installed at the output end of the pretreatment tank. The carbonization component includes a carbonization reactor. The input end of the carbonization reactor is fixedly connected to the output end of the pretreatment tank through a pipe. A U-shaped cooler is installed on one side of the carbonization reactor, and a carbon dioxide compressor is installed on the other side of the carbonization reactor. A vacuum belt filter is fixedly connected to the output end of the carbonization reactor, and a wet separation component is installed on one side of the vacuum belt filter.

[0008] The wet separation assembly includes a preheating group and a wet decomposition tower. The preheating group includes preheater one, preheater two, and preheater three. One side of preheater one is fixedly connected to the mother liquor outlet of the vacuum filter via a pipe. Preheater two and preheater three are sequentially connected between preheater one and the wet decomposition tower. The other outlet of preheater three discharges steam condensate. A cooler is installed at one end of preheater one. A steam compressor, a reboiler, and a vapor-liquid separator are installed on one side of the wet decomposition tower. The bottom of the wet decomposition tower is the concentrate outlet connected to the vapor-liquid separator. The unit is also connected to the top of the vapor-liquid separator via a steam compressor; the top of the wet decomposition tower is connected to the reboiler, and the other end of the reboiler is connected to the preheater. The steam outlet of the reboiler is connected to the vapor-liquid separator. The liquid outlet of the vapor-liquid separator is connected to a thickener via a pipeline. The outlet of the thickener is connected to the inlet of centrifuge 1 via a pipeline. The solid outlet of centrifuge 1 is connected to the product storage bin, and the liquid outlet is connected to the circulating liquid tank. The bottom outlet of the circulating liquid tank is connected to the reboiler and the second preheater via a bottom pump. The outlet of the second preheater discharges the wet decomposition completed liquid into the injection well.

[0009] Furthermore, a centrifuge 2 is provided on one side of the vacuum filter, and a calcination component is provided at the outlet of the centrifuge 2.

[0010] Furthermore, the calcination assembly includes a calcination furnace and a cold alkali furnace. The inlet of the calcination furnace is connected to the outlet of the centrifuge, the inlet of the cold alkali furnace is connected to the outlet of the calcination furnace, and the outlet of the cold alkali furnace is connected to a packaging machine.

[0011] Furthermore, the exhaust gas outlet of the calcining furnace is connected to a gas scrubbing tower via a pipeline, and the gas outlet of the gas scrubbing tower is connected to a carbon dioxide compressor via a pipeline.

[0012] Furthermore, the outlet of the carbon dioxide compressor is connected to the inlet of the carbonization reactor via a pipe.

[0013] Furthermore, the inlet and outlet on one side of the carbonization reactor are connected to the inlet and outlet of the U-shaped cooler via a circulation pipeline.

[0014] Advantages and effects of this utility model:

[0015] 1. This utility model firstly removes insoluble substances from natural alkaline brine through pretreatment to ensure the purity of carbonization products. The U-shaped cooler maintains the carbonization temperature to ensure efficient reaction. After the carbonization products are separated, the mother liquor enters the wet decomposition system. The steam at the top of the tower forms a heat pump for energy saving, and the concentrate at the bottom of the tower recovers sodium chloride. This achieves efficient crystallization of sodium bicarbonate, recovery of sodium chloride, and recycling of carbon dioxide, reducing energy consumption and costs, and improving environmental protection.

[0016] 2. The sodium bicarbonate filter cake of this utility model is dehydrated and calcined, and indirectly heated by steam to ensure product purity. The carbon dioxide in the calcination tail gas is compressed and reused to reduce emissions and costs. The cold alkali furnace is used for cooling and the packaging machine is used for packaging. The whole process reduces energy consumption and emissions, ensures the quality of soda ash products, and achieves green and efficient production. Attached Figure Description

[0017] Figure 1 This is a diagram of the device of this utility model.

[0018] The components include: 1. Pretreatment tank; 2. Carbonization reactor; 3. U-shaped cooler; 4. Carbon dioxide compressor; 5. Vacuum filter; 6. Preheater I; 7. Wet decomposition tower; 8. Steam compressor; 9. Reboiler; 10. Vapor-liquid separator; 11. Thickener; 12. Centrifuge I; 13. Product storage silo; 14. Circulating liquid tank; 15. Preheater II; 16. Cooler; 17. Centrifuge II; 18. Calcination furnace; 19. Cold alkali furnace; 20. Packaging machine; 21. Gas scrubbing tower. Detailed Implementation

[0019] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. The following embodiments are merely descriptive and not limiting, and should not be used to limit the scope of protection of the present invention.

[0020] A production apparatus for heat pump wet decomposition and salt-alkali separation of high-salt natural alkaline brine includes a pretreatment tank 1. The pretreatment tank 1 is equipped with a sand filter and a microporous filter. A carbonization component is installed at the output end of the pretreatment tank 1. The carbonization component includes a carbonization reactor 2. The input end of the carbonization reactor 2 is fixedly connected to the output end of the pretreatment tank 1 through a pipe. A U-shaped cooler 3 is installed on one side of the carbonization reactor 2. A carbon dioxide compressor 4 is installed on the other side of the carbonization reactor 2. A vacuum belt filter 5 is fixedly connected to the output end of the carbonization reactor 2. A wet separation component is installed on one side of the vacuum belt filter 5.

[0021] The wet separation assembly includes a preheating group and a wet decomposition tower 7. The preheating group includes a first preheater 6, a second preheater 15, and a third preheater. One side of the first preheater 6 is fixedly connected to the mother liquor outlet of the vacuum filter 5 via a pipe. The second preheater 15 and the third preheater are also connected sequentially between the first preheater 6 and the wet decomposition tower 7. The other outlet of the third preheater discharges steam condensate back to the boiler steam condensate tank. A cooler 16 is installed at one end of the first preheater 6. A steam compressor 8, a reboiler 9, and a vapor-liquid separator 10 are installed on one side of the wet decomposition tower 7. The wet decomposition tower 7 operates at atmospheric pressure. The concentrated liquid outlet at its bottom is connected to the vapor-liquid separator 10. The bottom material enters the vapor-liquid separator 10 by pressure difference. The steam outlet on the lower side of the wet decomposition tower 7 is also connected to the top of the vapor-liquid separator 10 via the steam compressor 8. The negative pressure generated by the vapor-liquid separator... The compressed steam enters the bottom of the wet decomposition tower after being compressed and pressurized by the compressor. The top of the wet decomposition tower is connected to the reboiler 9, and the other end of the reboiler is also connected to the preheater. The steam at the top of the tower enters the preheater after passing through the reboiler to preheat the feed mother liquor of the wet decomposition tower. Part of the condensate is cooled and removed to remove salt from the sodium bicarbonate in the filter, and part is used to make up for the circulating water. The steam outlet of the reboiler 9 is connected to the vapor-liquid separator 10. The liquid outlet of the vapor-liquid separator 10 is connected to the thickener 11 through a pipeline. The outlet of the thickener 11 is connected to the inlet of the centrifuge 12 through a pipeline. The solid outlet of the centrifuge 12 is connected to the product placement chamber 13, and the liquid outlet is connected to the circulating liquid tank 14. The bottom outlet of the circulating liquid tank 14 is connected to the reboiler 9 and the inlet of the preheater 2 15 through the bottom pump. The outlet of the preheater 2 15 discharges the wet decomposition completed liquid into the injection well.

[0022] Specifically, when the production unit is started, the natural soda brine is first transported to the pretreatment tank 1, where it is filtered through an internal sand filter and microfiltration filter to effectively remove solid impurities. The purified brine then enters the carbonization reactor 2 through a pipeline. Simultaneously, carbon dioxide gas from the carbon dioxide compressor 4 is evenly introduced into the bottom of the reactor. In the carbonization reactor 2, the brine reacts with carbon dioxide to form sodium bicarbonate crystals. At the same time, the reaction liquid is transported to the U-shaped cooler 3 through a circulation pipeline for temperature regulation. The cooled liquid returns to the carbonization reactor 2 to continue the reaction. After the reaction is complete... After solidification, the slurry containing sodium bicarbonate crystals is discharged from the bottom of the reactor and enters the vacuum filter 5 for solid-liquid separation. During the filtration process, the filter cake is washed with condensate recovered by the system when it passes through the washing zone, which effectively removes impurities from the crystal surface. The separated carbonized mother liquor enters the preheater 6 and is then transported to the wet decomposition tower 7 after multi-stage preheating. In the wet decomposition tower 7, the sodium bicarbonate in the mother liquor is decomposed by heat, and the generated steam is pressurized by the compressor 8 and used as a heat source to enter the reboiler 9. The concentrated liquid at the bottom of the tower is flashed by the vapor-liquid separator 10 and then separated into sodium chloride product by the thickener 11 and the centrifuge 12.

[0023] A centrifuge 2 17 is installed on one side of the vacuum filter 5. A calcination assembly is installed at the outlet of the centrifuge 2 17. The calcination assembly includes a calcination furnace 18 and a cold alkali furnace 19. The inlet of the calcination furnace 18 is connected to the outlet of the centrifuge 2 17. The inlet of the cold alkali furnace 19 is connected to the outlet of the calcination furnace 18. A packaging machine 20 is connected to the outlet of the cold alkali furnace 19. A gas scrubbing tower 21 is connected to the tail gas outlet of the calcination furnace 18 through a pipeline. The outlet of the gas scrubbing tower 21 is connected to a carbon dioxide compressor 4 through a pipeline. The outlet of the carbon dioxide compressor 4 is connected to the inlet of the carbonization reactor 2 through a pipeline. The inlet and outlet of one side of the carbonization reactor 2 are connected to the inlet and outlet of the U-shaped cooler 3 through a circulation pipeline.

[0024] Specifically, the sodium bicarbonate filter cake obtained by vacuum filter press 5 is further dehydrated by centrifuge 17 and then enters calcination furnace 18 through conveying equipment. In calcination furnace 18, sodium bicarbonate decomposes into light sodium carbonate under heating conditions, while producing carbon dioxide and water vapor. The decomposition gas is purified by gas scrubbing tower 21, and the carbon dioxide is recovered by carbon dioxide compressor 4 and reused in the carbonization reaction. The calcined hot soda ash product enters cold soda furnace 19 for cooling treatment. The cooled finished product is automatically packaged by packaging machine 20. The entire calcination process realizes efficient utilization of heat energy and recycling of carbon dioxide, ensuring that the final product meets the specified quality standards.

[0025] Working Principle: When this production unit is needed, the natural soda brine is first transported to the pretreatment tank. After insoluble matter is removed by a sand filter and a microfiltration filter in the pretreatment tank, it enters the carbonization reactor, where it reacts with carbon dioxide gas from the carbon dioxide compressor to produce sodium bicarbonate crystals. The carbonization reaction liquid is cooled by a U-shaped cooler and returned to the carbonization reactor to maintain the reaction temperature. The carbonization products are separated by a vacuum belt filter. The filter cake sodium bicarbonate enters the subsequent calcination section, while the mother liquor enters the wet decomposition system, which consists of preheater one, preheater two, preheater three, and a wet decomposition tower. Inside the wet decomposition tower, sodium bicarbonate in the mother liquor is thermally decomposed into sodium carbonate and carbon dioxide. The steam at the top of the tower is pressurized by a compressor and then enters the reboiler to heat the circulating liquid, achieving energy saving through the heat pump. The concentrated liquid at the bottom of the tower enters the vapor-liquid separator. After flash evaporation in the vapor-liquid separator, sodium chloride product is separated by a thickener and centrifuge. The remaining mother liquor enters the circulating liquid tank and is partially circulated to preheater 2 by the bottom pump. It is then discharged into the wet decomposition liquid injection well, achieving efficient crystallization separation of sodium bicarbonate, recovery of sodium chloride in the mother liquor, and recycling of carbon dioxide.

[0026] In addition, the sodium bicarbonate filter cake from the vacuum filter press is dehydrated in a centrifuge and then enters the calcination furnace, where it decomposes into light sodium carbonate, carbon dioxide, and water vapor under indirect steam heating. The calcination tail gas is cooled and dehumidified in a gas scrubbing tower, and the carbon dioxide is compressed by a carbon dioxide compressor and returned to the carbonation reactor for reuse. The soda ash is cooled in a cold soda furnace and packaged by a packaging machine, which significantly reduces energy consumption and emissions while ensuring product purity.

[0027] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A production device for high-salt trona brine heat pump wet decomposition and salt-alkali separation, comprising a pretreatment tank (1), characterized in that: The pretreatment tank (1) is equipped with a sand filter and a microporous filter. The output end of the pretreatment tank (1) is equipped with a carbonization component, which includes a carbonization reactor (2). The input end of the carbonization reactor (2) is fixedly connected to the output end of the pretreatment tank (1) through a pipe. A U-shaped cooler (3) is provided on one side of the carbonization reactor (2), and a carbon dioxide compressor (4) is provided on the other side of the carbonization reactor (2). A vacuum belt filter (5) is fixedly connected to the output end of the carbonization reactor (2), and a wet separation component is provided on one side of the vacuum belt filter (5). The wet separation assembly includes a preheating group and a wet decomposition tower (7). The preheating group includes preheater one (6), preheater two (15), and preheater three. One side of preheater one (6) is fixedly connected to the mother liquor outlet of the vacuum filter (5) through a pipe. Preheater one (6) and preheater three are also connected in sequence between preheater two (15) and wet decomposition tower (7). The other outlet of preheater three discharges steam condensate. A cooler (16) is provided at one end of preheater one (6). A steam compressor (8), a reboiler (9), and a vapor-liquid separator (10) are provided on one side of the wet decomposition tower (7). The bottom of the wet decomposition tower (7) is the concentrated liquid outlet connected to the vapor-liquid separator (10). The lower part of the wet decomposition tower (7) is also The steam compressor (8) is connected to the top of the vapor-liquid separator (10); the top of the wet decomposition tower is connected to the reboiler (9), and the other end of the reboiler is also connected to the preheater. The steam outlet of the reboiler (9) is connected to the vapor-liquid separator (10). The liquid outlet of the vapor-liquid separator (10) is connected to the thickener (11) through a pipe. The outlet of the thickener (11) is connected to the inlet of the centrifuge (12) through a pipe. The solid outlet of the centrifuge (12) is connected to the product placement silo (13). The liquid outlet is connected to the circulating liquid tank (14). The bottom outlet of the circulating liquid tank (14) is connected to the reboiler (9) and the preheater (2) (15) through the bottom pump. The outlet of the preheater (2) (15) discharges the wet decomposition completed liquid into the injection well.

2. The production device for high-salt natural alkali brine heat pump wet decomposition and salt-alkali separation according to claim 1, characterized in that: A centrifuge 2 (17) is provided on one side of the vacuum filter (5), and a calcination component is provided at the outlet of the centrifuge 2 (17).

3. The production device for high-salt natural alkali brine heat pump wet decomposition and salt-alkali separation according to claim 2, characterized in that: The calcination assembly includes a calcination furnace (18) and a cold alkali furnace (19). The inlet of the calcination furnace (18) is connected to the outlet of the centrifuge (17). The inlet of the cold alkali furnace (19) is connected to the outlet of the calcination furnace (18). The outlet of the cold alkali furnace (19) is connected to a packaging machine (20).

4. The production device for high-salt natural alkali brine heat pump wet decomposition and salt-alkali separation according to claim 3, characterized in that: The tail gas outlet of the calcining furnace (18) is connected to a gas scrubbing tower (21) via a pipe, and the gas outlet of the gas scrubbing tower (21) is connected to a carbon dioxide compressor (4) via a pipe.

5. The production device for high-salt natural alkali brine heat pump wet decomposition and salt-alkali separation according to claim 4, characterized in that: The outlet of the carbon dioxide compressor (4) is connected to the inlet of the carbonization reactor (2) via a pipe.

6. The production device for high-salt natural alkali brine heat pump wet decomposition and salt-alkali separation according to claim 3, characterized in that: The inlet and outlet of the carbonization reactor (2) are connected to the inlet and outlet of the U-shaped cooler (3) via a circulation pipeline.

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