Brine cooling device in acid process boron extraction process

Abstract

The utility model relates to the technical field of salt lake boron extraction, in particular to a brine cooling device in an acid process boron extraction process, which comprises a first-stage plate heat exchanger, a second-stage plate heat exchanger, a freezing water tank, a first pipeline pump, a water-cooled water chilling unit, a second pipeline pump and a cooling water tower, a water outlet of the chilled water tank is connected with a chilled water inlet of the water-cooled water chilling unit, a first pipeline pump is arranged between the chilled water tank and the water-cooled water chilling unit, and a chilled water outlet of the water-cooled water chilling unit is connected with a chilled water inlet of the second-stage plate heat exchanger. A chilled water outlet of the second-stage plate heat exchanger is connected with a chilled water inlet of the first-stage plate heat exchanger, and a chilled water outlet of the first-stage plate heat exchanger is connected with a water inlet of the chilled water tank. The device has the effects of accurately controlling the brine temperature, improving the acidification rate and productivity of boric acid, realizing continuous production of boric acid and reducing the operation and maintenance cost of equipment.

Description

Technical Field

[0001] The present application relates to the technical field of boron extraction from salt lakes, and in particular to a brine cooling device in the process of acid boron extraction. Background Art

[0002] Boron and its compounds are widely used in metallurgy, light industry, chemical industry, nuclear industry, agriculture, high-tech materials and other fields. my country's boron mines are mainly distributed in Qinghai Province, Tibet Autonomous Region, Liaoning Province and Jilin Province, among which the reserves of salt lake boron mines account for about 50% of the total national reserves. Therefore, promoting the comprehensive development and utilization of boron-rich salt lakes has important scientific and economic significance. The technologies for extracting boron from salt lake brine are mainly divided into acidification method, precipitation method, adsorption method and extraction method.

[0003] At present, in the process of extracting boron from salt lake brine by acidification, it is found that when the temperature of raw brine in the acidification process is controlled at about 15°C, the acidification rate and production capacity can be improved. The existing brine cooling device uses 23°C cooling water provided by the cooling tower to circulate heat exchange cooling on the raw brine, but due to the high temperature in summer, the temperature of raw brine can reach up to 40°C. The cooling effect of the existing device is not obvious, the equipment operation and maintenance cost is high, and the temperature of raw brine cannot be accurately controlled, resulting in low acidification rate and reduced production capacity in the process of boron extraction, and the inability to achieve continuous production of boric acid. Utility Model Content

[0004] In order to improve the cooling effect, accurately control the brine temperature, increase the boric acid acidification rate and production capacity, realize the continuous production of boric acid, and reduce the equipment operation and maintenance costs, the present application provides a brine cooling device in the acid method for boron extraction.

[0005] The brine cooling device in the acid boron extraction process provided in this application adopts the following technical solution:

[0006] A brine cooling device in an acid-based boron extraction process comprises a primary plate heat exchanger, a secondary plate heat exchanger, a refrigerated water tank, a first pipeline pump, a water-cooled chiller, a second pipeline pump, and a cooling water tower, wherein the brine inlet of the primary plate heat exchanger is connected to a brine supply pipeline, the brine outlet of the primary plate heat exchanger is connected to the brine inlet of the secondary plate heat exchanger, and the brine outlet of the secondary plate heat exchanger is connected to a brine discharge pipeline; the water replenishment port of the refrigerated water tank is connected to a cooling water supply pipeline; the outlet of the refrigerated water tank is connected to the refrigerated water inlet of the water-cooled chiller, and the A first pipeline pump is provided between the chilled water tank and the water-cooled chiller, the chilled water outlet of the water-cooled chiller is connected to the chilled water inlet of the secondary plate heat exchanger, the chilled water outlet of the secondary plate heat exchanger is connected to the chilled water inlet of the primary plate heat exchanger, the chilled water outlet of the primary plate heat exchanger is connected to the inlet of the chilled water tank; the outlet of the cooling water tower is connected to the cooling water inlet of the water-cooled chiller, a second pipeline pump is provided between the cooling water tower and the water-cooled chiller, the cooling water outlet of the water-cooled chiller is connected to the inlet of the cooling water tower.

[0007] By adopting the above technical scheme, the primary plate heat exchanger, the secondary plate heat exchanger, the chilled water tank, the first pipeline pump, and the water-cooled chiller form a closed chilled water circulation system. The system uses the water-cooled chiller to provide chilled water, so that the high-temperature raw brine in summer can be cooled to about 15°C through the primary plate heat exchanger and the secondary plate heat exchanger. The cooling effect is obvious, which meets the production process requirements of acid-based boron extraction and achieves an increase in the boric acid acidification rate and production capacity; the water-cooled chiller, the second pipeline pump, and the cooling water tower form a closed cooling water circulation system. The system dissipates heat from the water-cooled chiller to ensure the normal operation of the water-cooled chiller.

[0008] Preferably, a multi-media filter is provided at the brine supply pipeline, and pressure gauges are provided at the brine inlet and the brine outlet of the multi-media filter.

[0009] By adopting the above technical solution, a multi-media filter is provided at the brine supply pipeline, which can effectively remove suspended impurities in the brine and avoid clogging of the plate heat exchanger. Pressure gauges are provided at the brine inlet and brine outlet of the multi-media filter to monitor the pressure difference in the multi-media filter in real time to determine whether the multi-media filter needs to be cleaned.

[0010] Electric temperature control valves are provided at the chilled water inlets of the primary plate heat exchanger and the secondary plate heat exchanger, and temperature sensors are provided at the brine outlets of the primary plate heat exchanger and the secondary plate heat exchanger, and the electric temperature control valves are electrically connected to the temperature sensors.

[0011] By adopting the above technical solution, the electric temperature control valve located at the chilled water inlet of the primary plate heat exchanger or the secondary plate heat exchanger automatically adjusts the valve opening by receiving the electrical signal transmitted by the temperature sensor located at the brine outlet of the primary plate heat exchanger or the secondary plate heat exchanger, thereby controlling the chilled water inlet flow rate and accurately controlling the temperature of the brine after heat exchange.

[0012] Preferably, two first pipeline pumps are provided, and the two first pipeline pumps are arranged in parallel, and two second pipeline pumps are provided, and the two second pipeline pumps are arranged in parallel.

[0013] By adopting the above technical solution, two first pipeline pumps are provided, and the two first pipeline pumps are arranged in parallel; two second pipeline pumps are provided, and the two second pipeline pumps are arranged in parallel, one for use and one for backup, to ensure that the chilled water does not stop circulating, to achieve continuous cooling of the brine, and continuous production of boric acid.

[0014] Furthermore, a Y-type filter is provided at the water inlet of the first pipeline pump and the second pipeline pump.

[0015] By adopting the above technical solution, a Y-type filter is arranged at the water inlet of the first pipeline pump and the second pipeline pump, which can filter mechanical impurities and reduce the wear or blockage of the pipeline or equipment caused by the impurities.

[0016] Furthermore, butterfly valves are provided at the water outlets of the first pipeline pump and the second pipeline pump, and slow-closing check valves are provided in front of the butterfly valves.

[0017] By adopting the above technical solution, butterfly valves are provided at the water outlets of the first pipeline pump and the second pipeline pump, and a slow-closing check valve is provided in front of the butterfly valve to prevent water hammer formed by liquid from damaging the water pump when the pump is stopped.

[0018] Preferably, a liquid level sensor is provided in the freezing water tank, an electric valve is provided at the water supply port of the freezing water tank, and the liquid level sensor is electrically connected to the electric valve.

[0019] By adopting the above technical solution, the electric valve located at the water filling port of the chilled water tank controls the opening and closing of the valve by receiving the electrical signal transmitted by the liquid level sensor located in the chilled water tank, thereby realizing the automatic water filling function of the chilled water tank.

[0020] Preferably, electronic descaling devices are provided at the brine inlet of the primary plate heat exchanger, the chilled water inlet of the water-cooled chiller, the cooling water inlet of the water-cooled chiller and the water supply port of the chilled water tank.

[0021] By adopting the above technical scheme, electronic descaling devices are installed at the brine inlet of the primary plate heat exchanger, the chilled water inlet of the water-cooled chiller, the cooling water inlet of the water-cooled chiller and the water supply port of the chilled water tank, which can effectively reduce the formation of scale in the equipment.

[0022] In summary, the present application includes at least one of the following beneficial technical effects:

[0023] 1. The brine cooling device formed by the primary plate heat exchanger, the secondary plate heat exchanger, the chilled water tank, the first pipeline pump, the water-cooled chiller, the second pipeline pump, and the cooling water tower can reduce the temperature of the high-temperature raw brine in summer to about 15°C through the primary plate heat exchanger and the secondary plate heat exchanger. The cooling effect is obvious, which meets the production process requirements of acid-based boron extraction and achieves the improvement of boric acid acidification rate and production capacity;

[0024] 2. Multi-media filters are installed at the brine supply pipeline, and Y-type filters are installed at the water inlets of the first pipeline pump and the second pipeline pump to filter mechanical impurities and reduce the wear or blockage of the pipelines or equipment in the brine cooling device caused by impurities. At the same time, electronic descaling devices are installed at the brine inlet of the primary plate heat exchanger, the chilled water inlet of the water-cooled chiller, the cooling water inlet of the water-cooled chiller, and the water supply port of the frozen water tank to reduce the formation of scale in the equipment and reduce the equipment operation and maintenance cost of the brine cooling device;

[0025] 3. By installing electric temperature control valves at the chilled water inlets of the primary plate heat exchanger and the secondary plate heat exchanger, and installing temperature sensors at the brine outlets of the primary plate heat exchanger and the secondary plate heat exchanger, the electric temperature control valves automatically adjust the valve opening by receiving the electrical signals transmitted by the temperature sensors, control the chilled water inlet flow rate, and realize the precise control of the brine temperature after heat exchange;

[0026] 4. By setting two first pipeline pumps, the two first pipeline pumps are arranged in parallel, and setting two second pipeline pumps, the two second pipeline pumps are arranged in parallel, one for use and one for backup, it is ensured that the chilled water does not stop circulating, the brine is continuously cooled, and the boric acid is continuously produced. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of a brine cooling device in the acid-based boron extraction process.

[0028] Among them, 1. Primary plate heat exchanger; 2. Secondary plate heat exchanger; 3. Chilled water tank; 4. First pipeline pump; 5. Water-cooled chiller; 6. Second pipeline pump; 7. Cooling water tower; 8. Brine supply pipeline; 9. Multi-media filter; 10. Pressure gauge; 11. Electric temperature control valve; 12. Temperature sensor; 13. Y-type filter; 14. Butterfly valve; 15. Slow-closing check valve; 16. Liquid level sensor; 17. Electric valve; 18. Electronic descaling device. DETAILED DESCRIPTION

[0029] The following is combined with Figure 1 This application is described in further detail.

[0030] The present application embodiment discloses a brine cooling device in the acid method boron extraction process. Figure 1 A brine cooling device in an acid-based boron extraction process comprises a primary plate heat exchanger 1, a secondary plate heat exchanger 2, a chilled water tank 3, a first pipeline pump 4, a water-cooled chiller 5, a second pipeline pump 6, and a cooling water tower 7. The brine inlet of the primary plate heat exchanger 1 is connected to a brine supply pipeline 8, the brine outlet of the primary plate heat exchanger 1 is connected to the brine inlet of the secondary plate heat exchanger 2, and the brine outlet of the secondary plate heat exchanger 2 is connected to a brine discharge pipeline. In the acid-based boron extraction production process, raw brine flows in from the brine supply pipeline 8, is cooled by heat exchange with chilled water through the primary plate heat exchanger 1, and is further cooled by heat exchange with chilled water through the secondary plate heat exchanger 2. The cooled raw brine flows into the next process through the brine discharge pipeline.

[0031] The water replenishment port of the chilled water tank 3 is connected to a cooling water supply pipeline, and the replenishment water source of the chilled water tank 3 is a water source that has been treated by impurity removal, electrodialysis, and cooling.

[0032] The outlet of the chilled water tank 3 is connected to the chilled water inlet of the water-cooled chiller 5. A first pipeline pump 4 is provided between the chilled water tank 3 and the water-cooled chiller 5. The chilled water outlet of the water-cooled chiller 5 is connected to the chilled water inlet of the secondary plate heat exchanger 2. The chilled water outlet of the secondary plate heat exchanger 2 is connected to the chilled water inlet of the primary plate heat exchanger 1. The chilled water outlet of the primary plate heat exchanger 1 is connected to the water inlet of the chilled water tank 3. The chilled water from the chilled water tank 3 is pumped into the water-cooled chiller 5 through the first pipeline pump 4. The chilled water is frozen in the unit 5, and the chilled water passes through the secondary plate heat exchanger 2 to exchange heat with the raw brine, and then passes through the primary plate heat exchanger 1 to exchange heat with the raw brine again. The heated chilled water flows into the freezing water tank 3 and is pumped into the water-cooled chiller 5 for freezing again, thereby forming a closed chilled water circulation system, so that the high-temperature raw brine in summer is cooled to about 15°C through the primary plate heat exchanger 1 and the secondary plate heat exchanger 2, and the cooling effect is obvious, which meets the requirements of the acid-based boron extraction production process and realizes the improvement of the boric acid acidification rate and production capacity. The outer wall of the pipe of the chilled water circulation system should be equipped with a cold preservation device to reduce the energy consumption of the water-cooled chiller 5, thereby reducing the operating cost of the brine cooling device.

[0033] The water outlet of the cooling water tower 7 is connected to the cooling water inlet of the water-cooled chiller 5. A second pipeline pump 6 is provided between the cooling water tower 7 and the water-cooled chiller 5. The cooling water outlet of the water-cooled chiller 5 is connected to the water inlet of the cooling water tower 7. The water-cooled chiller 5 releases a large amount of heat when freezing the chilled water. At this time, the cooling water from the cooling water tower 7 is pumped into the water-cooled chiller 5 through the second pipeline pump 6 for heat exchange. The heated cooling water flows into the cooling water tower 7 for cooling. The cooled cooling water is pumped into the water-cooled chiller 5 again for heat exchange, thereby forming a closed cooling water circulation system, thereby ensuring the normal operation of the water-cooled chiller 5.

[0034] A multi-media filter 9 is provided at the brine supply pipeline 8, and pressure gauges 10 are provided at the brine inlet and the brine outlet of the multi-media filter 9; the multi-media filter 9 provided at the brine supply pipeline 8 can effectively remove suspended impurities in the brine and avoid blockage of the plate heat exchanger, and pressure gauges 10 are provided at the brine inlet and the brine outlet of the multi-media filter 9, which can monitor the pressure difference in the multi-media filter 9 in real time. When the pressure difference exceeds the set value, the valves on the brine inlet and the brine outlet of the multi-media filter 9 are closed, and the valve on the sewage outlet of the multi-media filter 9 is opened. After the sewage is discharged, the valve on the sewage outlet of the multi-media filter 9 is closed, and the valves on the backwash inlet, the backwash outlet and the exhaust port of the multi-media filter 9 are opened, and water is pumped into the backwash inlet to realize the backwashing of the multi-media filter 9, thereby restoring the filtering capacity of the multi-media filter 9.

[0035] The brine inlet and chilled water inlet of the primary plate heat exchanger 1 and the secondary plate heat exchanger 2 are provided with a butterfly valve 14, a thermometer, a pressure gauge 10 and a bypass valve in sequence, and the brine outlet and chilled water outlet of the primary plate heat exchanger 1 and the secondary plate heat exchanger 2 are provided with a bypass valve, a pressure gauge 10, a thermometer and a butterfly valve 14 in sequence, so as to monitor the status of each pipeline in real time; when the pressure difference of the pressure gauge 10 provided on the brine inlet and the brine outlet of the primary plate heat exchanger 1 exceeds the set value, the butterfly valves 14 on both sides are closed, and the bypass valves on both sides are opened for sewage discharge. After the sewage discharge is completed, the cleaning agent is pumped into the bypass valve at the brine outlet, and the cleaning agent flows out from the bypass valve at the brine inlet after internal flow, and the cleaning is circulated until all the dirt inside the plate heat exchanger is removed, and then water is pumped in for flushing. The chilled water inlet and outlet pipes of the primary plate heat exchanger 1, the brine inlet and outlet pipes of the secondary plate heat exchanger 2, and the chilled water inlet and outlet pipes of the secondary plate heat exchanger 3 can all be cleaned in this way. This method realizes the non-disassembly cleaning of the plate heat exchanger, which not only restores the heat exchange efficiency of the plate heat exchanger, but also saves time and effort.

[0036] An electric temperature control valve 11 is provided between the butterfly valve 14 and the thermometer at the chilled water inlet of the primary plate heat exchanger 1 and the secondary plate heat exchanger 2, and a temperature sensor 12 is provided between the thermometer and the butterfly valve 14 at the brine outlet of the primary plate heat exchanger 1 and the secondary plate heat exchanger 2, and the electric temperature control valve 11 is electrically connected to the temperature sensor 12; when the electrical signal transmitted by the temperature sensor 12 located at the brine outlet of the primary plate heat exchanger 1 or the secondary plate heat exchanger 2 is higher or lower than a limited value, the electric temperature control valve 12 located at the chilled water inlet of the primary plate heat exchanger 1 or the secondary plate heat exchanger 2 automatically adjusts the valve opening by receiving the electrical signal, controls the chilled water inlet flow rate, and thereby accurately controls the temperature of the brine after heat exchange.

[0037] There are two first pipeline pumps 4, which are arranged in parallel; there are two second pipeline pumps 6, which are arranged in parallel; when one pipeline pump is cleaned, repaired or damaged, another pipeline pump can be activated to ensure that the chilled water does not stop circulating, so as to achieve continuous cooling of the brine and continuous production of boric acid.

[0038] A butterfly valve 14, a pressure gauge 10, a Y-type filter 13 and a flexible joint are provided at the water inlet of the first pipeline pump 4 and the second pipeline pump 6 in sequence, and a flexible joint, a drain valve, a pressure gauge 10, a slow-closing check valve 15 and a butterfly valve 14 are provided at the water outlet of the first pipeline pump 4 and the second pipeline pump 6 in sequence; a Y-type filter 13 is provided at the water inlet of the first pipeline pump 4 and the second pipeline pump 6 to filter mechanical impurities and reduce the wear or blockage of the pipeline or equipment caused by impurities; a drain valve is provided at the water outlet of the first pipeline pump 4 and the second pipeline pump 6 to facilitate the emptying of water in the pipe during maintenance; a slow-closing check valve 15 is provided in front of the butterfly valve 14 at the water outlet of the first pipeline pump 4 and the second pipeline pump 6 to prevent the water hammer formed by the liquid when the pump is stopped from damaging the water pump; soft joints are provided at both ends of the first pipeline pump 4, the second pipeline pump 6 and the water-cooled chiller 5 to buffer the vibration generated when the water-cooled chiller 5 is in operation.

[0039] A liquid level sensor 16 is provided in the chilled water tank 3, and an electric valve 17 is provided at the water filling port of the chilled water tank 3, and the liquid level sensor 16 is electrically connected to the electric valve 17; when the electrical signal transmitted by the liquid level sensor 16 located in the chilled water tank 3 is lower than a limited value, the electric valve 17 located at the water filling port of the chilled water tank 3 automatically controls the opening and closing of the valve by receiving the electrical signal, thereby realizing the automatic water filling function of controlling the chilled water tank 3.

[0040] An electronic descaling device 18 is provided at the brine inlet of the primary plate heat exchanger 1, the chilled water inlet of the water-cooled chiller 5, the cooling water inlet of the water-cooled chiller 5 and the water supply port of the chilled water tank 3, which can effectively reduce the formation of scale in the equipment and reduce the equipment operation and maintenance cost; and a bypass pipe is provided at the electronic descaling device 18 so that the electronic descaling device 18 can be repaired without stopping the machine.

[0041] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A brine cooling device in an acid-based boron extraction process, comprising a primary plate heat exchanger (1), a secondary plate heat exchanger (2), a chilled water tank (3), a first pipeline pump (4), a water-cooled chiller (5), a second pipeline pump (6), and a cooling water tower (7), characterized in that: The brine inlet of the primary plate heat exchanger (1) is connected to a brine supply pipeline (8); the brine outlet of the primary plate heat exchanger (1) is connected to the brine inlet of the secondary plate heat exchanger (2); the brine outlet of the secondary plate heat exchanger (2) is connected to a brine discharge pipeline; the water replenishment port of the chilled water tank (3) is connected to a cooling water supply pipeline; the outlet of the chilled water tank (3) is connected to the chilled water inlet of a water-cooled chiller (5); a first pipeline pump (4) is provided between the chilled water tank (3) and the water-cooled chiller (5); The chilled water outlet is connected to the chilled water inlet of the secondary plate heat exchanger (2), the chilled water outlet of the secondary plate heat exchanger (2) is connected to the chilled water inlet of the primary plate heat exchanger (1), the chilled water outlet of the primary plate heat exchanger (1) is connected to the inlet of the chilled water tank (3); the outlet of the cooling water tower (7) is connected to the cooling water inlet of the water-cooled chiller (5), a second pipeline pump (6) is provided between the cooling water tower (7) and the water-cooled chiller (5), and the cooling water outlet of the water-cooled chiller (5) is connected to the inlet of the cooling water tower (7).

2. The brine cooling device in the acid boron extraction process according to claim 1, characterized in that: A multi-media filter (9) is provided at the brine supply pipeline (8), and a pressure gauge (10) is provided at the brine inlet and the brine outlet of the multi-media filter (9).

3. The brine cooling device in the acid boron extraction process according to claim 1 is characterized in that: An electric temperature control valve (11) is provided at the chilled water inlet of the first-stage plate heat exchanger (1) and the second-stage plate heat exchanger (2), and a temperature sensor (12) is provided at the brine outlet of the first-stage plate heat exchanger (1) and the second-stage plate heat exchanger (2), and the electric temperature control valve (11) is electrically connected to the temperature sensor (12).

4. The brine cooling device in the acid boron extraction process according to claim 1 is characterized in that: There are two first pipeline pumps (4), which are arranged in parallel; there are two second pipeline pumps (6), which are arranged in parallel.

5. The brine cooling device in the acid boron extraction process according to claim 4 is characterized in that: A Y-type filter (13) is provided at the water inlet of the first pipeline pump (4) and the second pipeline pump (6).

6. The brine cooling device in the acid boron extraction process according to claim 4, characterized in that: A butterfly valve (14) is provided at the water outlet of the first pipeline pump (4) and the second pipeline pump (6), and a slow-closing check valve (15) is provided in front of the butterfly valve (14).

7. The brine cooling device in the acid boron extraction process according to claim 1 is characterized in that: A liquid level sensor (16) is provided in the freezing water tank (3), an electric valve (17) is provided at the water supply port of the freezing water tank (3), and the liquid level sensor (16) is electrically connected to the electric valve (17).

8. The brine cooling device in the acid boron extraction process according to claim 1, characterized in that: An electronic descaling device (18) is provided at the brine inlet of the primary plate heat exchanger (1), the chilled water inlet of the water-cooled chiller (5), the cooling water inlet of the water-cooled chiller (5) and the water supply port of the chilled water tank (3).

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