A flue gas method low nitrate high magnesium calcium type brine purification system

Abstract

The present invention relates to the technical field of brine purification systems, and in particular to a flue gas method low-nitrate high-magnesium-calcium brine purification system, comprising a primary brine preparation device and a refined brine preparation device which are interconnected; the primary brine preparation device comprises a first heat exchanger, a first preparation unit for preparing a primary degradation aid and a first reaction unit for preparing primary brine, the input end of the upper shell side of the first heat exchanger is connected to an external cooling medium, the output end of the upper shell side of the first heat exchanger is connected to the first preparation unit, and the input end of the upper tube side of the first heat exchanger is connected to raw brine. When in use, the primary brine is prepared by the primary brine preparation device, and then the primary brine is prepared by the refined brine preparation device, which solves the problems of high salt mud powder particle content and slow sedimentation; too long brine purification cycle; low clarity, easy "back mixing" during brine conversion, affecting the quality of liquid salt, etc.; it also solves the problem of frequent flushing of tubular filters.

Description

Technical Field

[0001] The invention relates to the technical field of brine purification systems, in particular to a flue gas method low-nitrate and high-magnesium-calcium brine purification system. Background Art

[0002] With the sustainable development of industrialization, the requirements for solid-liquid-gas waste discharge, effective resource utilization, energy conservation and consumption reduction are becoming higher and higher. Therefore, solving solid-liquid-gas waste, resource recycling, energy conservation and consumption reduction are the problems that the salt industry needs to solve. The lime flue gas brine purification process includes a primary carbonization reaction and a secondary carbonization reaction, which effectively utilizes the carbon dioxide in the mother liquor discharged from salt production and the flue gas, and effectively utilizes resources.

[0003] At present, the flue gas brine purification system, traditional equipment, and traditional brine production process use chemical methods to remove calcium, magnesium and sulfate impurities to produce solid-liquid mixtures, and separate solids and liquids through Doyle barrels, sand filters or filters, organic polymer membranes, fiber resin tower fine filtration and other technologies. It requires space and equipment, a purification cycle of 23~32h, a long process flow, high maintenance and operation costs, and high energy consumption; the salt mud settles slowly during the purification process, forming a high salt mud layer, and the preparation of liquid salt is prone to "re-mixing", affecting the quality of liquid salt; tubular filters are frequently flushed; and it is difficult to wash and dehydrate the salt mud in the later stage. Solid-liquid separation in the brine purification process has always been one of the difficult problems in the salt industry. Optimizing the brine purification device to improve the quality of refined brine is an urgent problem that the salt industry needs to solve. Summary of the invention

[0004] The technical problem to be solved by the present invention is: in order to solve the problem that the existing brine purification is prone to produce "fish eyes" flocs suspended in the liquid or floating on the surface of liquid salt, the efficacy of the auxiliary agent is greatly reduced, and the suspended or floating flocs will enter the next link with the brine conversion, affecting the reaction of the next link, and the filtration device is prone to block the filtration membrane pores, affecting the quality of the liquid flux. A flue gas method low nitrate and high magnesium and calcium brine purification system is now provided.

[0005] The technical solution adopted by the present invention to solve the technical problem is: a flue gas method low-nitrate high-magnesium-calcium brine purification system, comprising a primary brine preparation device and a refined brine preparation device which are interconnected;

[0006] The primary brine preparation device comprises a first heat exchanger, a primary preparation unit for preparing a primary degradation aid, and a primary reaction unit for preparing primary brine, the input end of the upper shell side of the first heat exchanger is connected to an external cooling medium, the output end of the upper shell side of the first heat exchanger is connected to the primary preparation unit, the input end of the upper tube side of the first heat exchanger is connected to the raw brine, the output end of the upper tube side of the first heat exchanger is connected to the primary reaction unit, and the primary preparation unit is connected to the primary reaction unit;

[0007] The refined brine preparation device includes a second heat exchanger, a secondary preparation unit for preparing a secondary degradation aid, and a secondary reaction unit for preparing refined brine. The input end of the upper shell side of the second heat exchanger is connected to an external cooling medium, the output end of the upper shell side of the second heat exchanger is connected to the secondary preparation unit, the input end of the upper tube side of the second heat exchanger is connected to the primary reaction unit, the output end of the upper tube side of the second heat exchanger is connected to the secondary reaction unit, and the secondary preparation unit is connected to the secondary reaction unit.

[0008] In some preferred embodiments, the primary reaction unit is connected to the raw halogen.

[0009] In some preferred embodiments, the secondary reaction unit is interconnected with the primary reaction unit.

[0010] In some preferred embodiments, a material transfer pump is provided between the primary reaction unit and the upper tube side of the second heat exchanger and between the secondary reaction unit and the primary reaction unit.

[0011] In some preferred embodiments, the primary preparation unit comprises a primary descending agent liquid preparation stirring barrel, the primary descending agent liquid preparation stirring barrel is provided with a first silo for conveying the primary solid descending agent thereto, and the primary descending agent liquid preparation stirring barrel is provided with a first agitator.

[0012] In some preferred embodiments, the primary reaction unit comprises a primary reaction barrel, a second agitator is disposed on the primary reaction barrel, and a first metering pump is disposed on a pipeline connecting the primary degradation agent liquid preparation agitator barrel and the primary reaction barrel.

[0013] In some preferred embodiments, a first detection sampling port is provided on the primary reaction barrel.

[0014] In some preferred embodiments, the secondary preparation unit comprises a secondary descending agent liquid preparation stirring barrel, the secondary descending agent liquid preparation stirring barrel is provided with a second silo for conveying the secondary solid descending agent thereto, and the secondary descending agent liquid preparation stirring barrel is provided with a third agitator.

[0015] In some preferred embodiments, the secondary reaction unit includes a secondary reaction barrel, a fourth agitator is provided on the secondary reaction barrel, a second metering pump is provided on the pipeline connecting the secondary degradation agent liquid preparation stirring barrel and the secondary reaction barrel, and a ventilation coil is provided on the secondary reaction barrel for setting flue gas into the interior thereof.

[0016] In some preferred embodiments, a second detection sampling port is provided on the secondary reaction barrel.

[0017] The beneficial effects of the present invention are as follows: when the flue gas method low-nitrate high-magnesium-calcium brine purification system of the present invention is used, first-level brine is prepared by a first-level brine preparation device, and then the first-level brine is passed through a refined brine preparation device to prepare refined brine, and the purification cycle is reduced to 12-20 hours, thereby shortening the purification cycle, increasing the average particle size of salt mud particles, settling quickly, and forming a low salt mud layer, increasing the amount of refined brine, reducing the turbidity of refined brine, reducing the cost of brine purification, and improving the efficiency of brine purification, thereby solving the problems of high content of salt mud powder particles and slow sedimentation; too long brine purification cycle; low clarity; easy "back mixing" during brine conversion; affecting the quality of liquid salt, etc.; it also solves the problem of frequent flushing of tubular filters; improving the salt mud washing efficiency and salt mud dehydration rate, which is beneficial to the comprehensive utilization of salt mud and has environmental advantages. In addition, the current process and device optimization further enhance the promotion of flue gas method brine purification in the industry for brine purification to produce liquid salt. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0019] Figure 1 It is a schematic diagram of the structure of the present invention;

[0020] Figure 2 It is a structural schematic diagram of the primary brine preparation device in the present invention;

[0021] Figure 3 It is a schematic structural diagram of the refined halogen preparation device in the present invention.

[0022] In the figure: 1. the first heat exchanger, 2. the first-level descending agent liquid preparation stirring barrel, 3. the first silo, 4. the first stirrer, 5. the first-level reaction barrel, 6. the second stirrer, 7. the first metering pump, 8. the first detection sampling port, 9. the second heat exchanger, 10. the second-level descending agent liquid preparation stirring barrel, 11. the second silo, 12. the third stirrer, 13. the second reaction barrel, 14. the fourth stirrer, 15. the second metering pump, 16. the second detection sampling port, 17. the ventilation coil, 18. the material transfer pump. DETAILED DESCRIPTION

[0023] The present invention is further described in detail below in conjunction with embodiments:

[0024] The present invention is not limited to the following specific embodiments. A person skilled in the art can implement the present invention in various other specific embodiments according to the contents disclosed in the present invention, or any simple changes or modifications made to the design structure and ideas of the present invention fall within the protection scope of the present invention. It should be noted that the embodiments and features in the embodiments of the present invention can be combined with each other without conflict.

[0025] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0026] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0027] like Figure 1-3 As shown, a flue gas method low-nitrate high-magnesium-calcium brine purification system comprises a primary brine preparation device and a refined brine preparation device which are interconnected;

[0028] The primary brine preparation device comprises a first heat exchanger 1, a primary descending agent liquid preparation stirring barrel 2 for preparing a primary descending agent, and a primary reaction barrel 5 for preparing primary brine, the input end of the upper shell side of the first heat exchanger 1 is connected to an external cooling medium, the output end of the upper shell side of the first heat exchanger 1 is connected to the primary descending agent liquid preparation stirring barrel 2 through an external pipeline, the input end of the upper tube side of the first heat exchanger 1 is connected to the raw brine, and the primary reaction barrel 5 is connected to the raw brine, the output end of the upper tube side of the first heat exchanger 1 is connected to the primary reaction barrel 5, the primary reaction barrel 5 is connected to the primary descending agent liquid preparation stirring barrel 2 through an external pipeline, and a first detection sampling port 8 is provided on the primary reaction barrel 5;

[0029] The refined brine preparation device includes a second heat exchanger 9, a secondary descending agent liquid preparation stirring barrel 10 for preparing a secondary descending agent, and a secondary reaction barrel 13 for preparing refined brine. The input end of the upper shell side of the second heat exchanger 9 is connected to the external cooling medium, the output end of the upper shell side of the second heat exchanger 9 is connected to the secondary descending agent liquid preparation stirring barrel 10, the input end of the upper tube side of the second heat exchanger 9 is connected to the primary reaction barrel 5, the output end of the upper tube side of the second heat exchanger 9 is connected to the secondary reaction barrel 13, the secondary descending agent liquid preparation stirring barrel 10 is connected to the secondary reaction barrel 13, the secondary reaction barrel 13 and the primary reaction barrel 5 are interconnected through an external pipeline, a material transfer pump 18 is provided between the primary reaction barrel 5 and the upper tube side of the second heat exchanger 9 and between the secondary reaction barrel 13 and the primary reaction unit barrel, and a second detection sampling port 16 is opened on the secondary reaction barrel 13.

[0030] In this embodiment, the first-level descending agent liquid preparation stirring barrel 2 is a first-level preparation unit, and the first-level descending agent liquid preparation stirring barrel 2 is provided with a first silo 3 for conveying the first-level solid descending agent thereto, and the first-level descending agent liquid preparation stirring barrel 2 is provided with a first agitator 4.

[0031] In this embodiment, the primary reaction barrel 5 is a primary reaction unit, and a second agitator 6 is disposed on the primary reaction barrel 5 . A first metering pump 7 is disposed on the pipeline connecting the primary degradation agent liquid preparation agitator barrel 2 and the primary reaction barrel 5 .

[0032] In this embodiment, the secondary descending agent liquid preparation stirring barrel 10 is a secondary preparation unit, and the secondary descending agent liquid preparation stirring barrel 10 is provided with a second silo 11 for conveying the secondary solid descending agent thereto, and the secondary descending agent liquid preparation stirring barrel 10 is provided with a third agitator 12.

[0033] In this embodiment, the secondary reaction barrel 13 is a secondary reaction unit, and a fourth agitator 14 is arranged on the secondary reaction barrel 13. A second metering pump 15 is arranged on the pipeline connecting the secondary degradation agent liquid preparation stirring barrel 10 and the secondary reaction barrel 13, and a ventilation coil 17 for setting flue gas inside the secondary reaction barrel 13 is arranged on the secondary reaction barrel 13.

[0034] When the above-mentioned flue gas method low-nitrate high-magnesium-calcium brine purification system is used, firstly, primary brine is prepared, and the raw brine is transported to the first heat exchanger 1 and the primary reaction barrel 5 respectively. The first heat exchanger 1 performs heat exchange on the raw brine, and transports the raw brine after heat exchange to the primary reaction barrel 5. The cooling medium in this embodiment is cooling water, and the cooling water passes through the shell side of the first heat exchanger 1 into the primary degradation agent liquid preparation stirring barrel 2, and then the first silo 3 adds the primary solid degradation agent to the primary degradation agent liquid preparation stirring barrel 2 and stirs it through the first stirrer 4 to form a primary degradation agent, and then transports it to the primary reaction barrel 5 through the first metering pump 7. The second stirrer 6 on the primary reaction barrel 5 stirs the primary degradation agent and the raw brine to form primary brine. At the same time, the first detection sampling port 8 on the primary reaction barrel 5 is convenient for sampling the primary brine in the primary reaction barrel 5. The primary reaction barrel 5 is provided with a first online detection device, and the first detection online detection device is used to detect the brine-related indicators in the primary reaction barrel 5;

[0035] During the preparation of refined brine, the primary brine is transported to the second heat exchanger 9 and the secondary reaction barrel 13 respectively. The second heat exchanger 9 performs heat exchange on the primary brine and transports the heat-exchanged primary brine to the secondary reaction barrel 13. The cooling water passes through the shell side of the second heat exchanger 9 and enters the secondary descending agent liquid stirring barrel 10. Then the second silo 11 adds the secondary solid descending agent to the secondary descending agent liquid stirring barrel 10 and stirs it through the third stirrer 12 to form the secondary descending agent. Then, it is transported to the secondary reaction barrel 13 through the second metering pump 15. The ventilation coil 17 generates micro-nano smoke bubbles in the flue gas, and removes inorganic Suspended matter and organic insoluble matter, after the ventilation end, stop passing the flue gas, replace the device to let in air for 0.5~1h, in order to remove the carbon dioxide and acidic gas dissolved in the brine, stop the carbon dioxide reaction from continuing to affect the quality of the secondary refined brine, and reduce the corrosion of the equipment, the fourth agitator 14 on the secondary reaction barrel 13 stirs the secondary degradation agent with the primary brine to form refined brine, and at the same time, the second detection sampling port 16 on the secondary reaction barrel 13 is convenient for sampling the refined brine in the secondary reaction barrel 13. The secondary reaction barrel 13 is provided with a second online detection device, and the second online detection device is used to detect the brine-related indicators in the secondary reaction barrel 13.

[0036] The above-mentioned ideal embodiments of the present invention are for inspiration. Through the above-mentioned description, relevant staff can make various changes and modifications without departing from the technical idea of ​​the present invention. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A flue gas method low nitrate high magnesium calcium type brine purification system, characterized by: It includes a primary brine preparation device and a refined brine preparation device which are interconnected; The first-stage brine preparation device comprises a first heat exchanger (1), a first-stage preparation unit for preparing a first-stage degradation aid, and a first-stage reaction unit for preparing first-stage brine, wherein the input end of the upper shell side of the first heat exchanger (1) is connected to an external cooling medium, the output end of the upper shell side of the first heat exchanger (1) is connected to the first-stage preparation unit, the input end of the upper tube side of the first heat exchanger (1) is connected to raw brine, the output end of the upper tube side of the first heat exchanger (1) is connected to the first-stage reaction unit, and the first-stage preparation unit is connected to the first-stage reaction unit; The refined brine preparation device comprises a second heat exchanger (9), a secondary preparation unit for preparing a secondary degradation aid, and a secondary reaction unit for preparing refined brine, the input end of the upper shell side of the second heat exchanger (9) is connected to an external cooling medium, the output end of the upper shell side of the second heat exchanger (9) is connected to the secondary preparation unit, the input end of the upper tube side of the second heat exchanger (9) is connected to the primary reaction unit, the output end of the upper tube side of the second heat exchanger (9) is connected to the secondary reaction unit, and the secondary preparation unit is connected to the secondary reaction unit; The secondary preparation unit comprises a secondary descending agent liquid preparation stirring barrel (10), the secondary descending agent liquid preparation stirring barrel (10) is provided with a second silo (11) for conveying the secondary solid descending agent thereto, and the secondary descending agent liquid preparation stirring barrel (10) is provided with a third stirrer (12); The secondary reaction unit comprises a secondary reaction barrel (13), a fourth stirrer (14) is arranged on the secondary reaction barrel (13), a second metering pump (15) is arranged on the pipeline connecting the secondary degradation agent liquid preparation stirring barrel (10) and the secondary reaction barrel (13), and a ventilation coil (17) for arranging flue gas into the secondary reaction barrel (13), the ventilation coil (17) is used to introduce flue gas or air and remove carbon dioxide and acidic gas dissolved in brine, so as to stop the carbon dioxide reaction from continuing to affect the quality of the secondary refined brine and reduce corrosion to the equipment.

2. A flue gas method low nitrate high magnesium calcium type brine purification system according to claim 1, characterized in that: The primary reaction unit is in communication with the raw halogen.

3. A flue gas method low nitrate high magnesium calcium type brine purification system according to claim 1, characterized in that: The secondary reaction unit is communicated with the primary reaction unit.

4. A flue gas method low nitrate high magnesium calcium type brine purification system according to claim 3, characterized in that: A material transfer pump (18) is provided between the primary reaction unit and the upper tube side of the second heat exchanger (9), and between the secondary reaction unit and the primary reaction unit.

5. A flue gas method low nitrate high magnesium calcium type brine purification system according to claim 1, characterized in that: The primary preparation unit comprises a primary descending agent liquid preparation stirring barrel (2), the primary descending agent liquid preparation stirring barrel (2) is provided with a first silo (3) for conveying the primary solid descending agent thereto, and the primary descending agent liquid preparation stirring barrel (2) is provided with a first stirrer (4).

6. A flue gas method low nitrate high magnesium calcium type brine purification system according to claim 5, characterized in that: The primary reaction unit comprises a primary reaction barrel (5), a second stirrer (6) is arranged on the primary reaction barrel (5), and a first metering pump (7) is arranged on the pipeline connecting the primary degradation agent liquid preparation stirring barrel (2) and the primary reaction barrel (5).

7. A flue gas method low nitrate high magnesium calcium type brine purification system according to claim 6, characterized in that: The primary reaction barrel (5) is provided with a first detection sampling port (8).

8. A flue gas method low nitrate high magnesium calcium type brine purification system according to claim 1, characterized in that: The secondary reaction barrel (13) is provided with a second detection sampling port (16).

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