Automatic energy-saving control system of circulating pump

Abstract

The utility model discloses an automatic energy-saving control system for a circulating pump, which is characterized in that a 1 # evaporation kettle, a 2 # evaporation kettle, a 3 # evaporation kettle, a 4 # evaporation kettle, a 1 # pre-cooling tank, a 2 # pre-cooling tank and a saline refrigerating unit are connected with a DCS (Distributed Control System) control cabinet through equipment operation signal transmission lines, and the equipment operation signal transmission lines are arranged between the DCS control cabinet and the saline refrigerating unit; a 1-4 # evaporation kettle is arranged on one side of the equipment operation signal transmission line, a 1-2 # pre-cooling tank and a 1-2 # water-cooling crystallization tank are arranged on the other side of the equipment operation signal transmission line, and the 1-4 # evaporation kettle and the 1-2 # pre-cooling tank are both connected with the equipment operation signal transmission line; the 1-2 # water-cooling crystallization tanks are connected with the DCS control cabinet through water-cooling crystallization tank operation signal transmission lines; the two ends of the brine refrigerating unit are connected with the DCS control cabinet through a temperature signal transmission line and a refrigerating unit starting signal line. The liquid purification equipment circulating pump is connected with the DCS control cabinet through a circulating pump frequency signal transmission line; and the DCS control cabinet is connected with the DCS engineer station. According to the utility model, equipment damage or energy loss caused by too large or too small frequency can be prevented.

Description

Technical Field

[0001] The utility model relates to an automatic energy-saving control system for a circulation pump, belonging to the technical field of copper electrolysis. Background Art

[0002] The nickel sulfate liquid purification system adopts the evaporation crystallization process, in which the circulating water pump plays a vital role. The existing circulating pump is a high-power remotely adjustable circulating pump. The frequency increase or frequency increase is mainly operated by on-site staff. The circulating pump runs at the public frequency for a long time, so the following situations exist:

[0003] 1. There are many devices turned on, and the operators did not increase the frequency or increased the frequency less;

[0004] 2. The number of running equipment is reduced, and the operators do not reduce the frequency, reduce the frequency less, or reduce the frequency more;

[0005] 3. Production in the clean liquid area is stopped, all equipment is shut down, and the operator directly stops the pump if the required temperature is not reached.

[0006] The above situations are all related to the flow rate of the circulating pump. The following situations may occur due to the frequency: 1) When there are many devices turned on and the personnel forget to increase the frequency or increase the frequency less, insufficient circulating water supply may cause the refrigeration unit to shut down, the evaporator plate to be damaged, and the pre-cooling tank and the water-cooled crystallization tank to cool down slowly; 2) When the frequency is not reduced or the frequency reduction is less, the circulation supply will exceed the demand, resulting in a waste of electricity. If the frequency reduction is more, the situation in 1) may occur; 3) When the production in the clean liquid area stops and all equipment is shut down, the operator directly stops the pump before the required temperature is reached. This may cause the circulating water to become stagnant and not flow, and the circulating water in the refrigerator coil to freeze, causing the coil to freeze and crack, causing equipment damage. Utility Model Content

[0007] In order to overcome the deficiencies of the prior art, the utility model provides an automatic energy-saving control system for a circulation pump, which can prevent equipment damage or energy loss caused by excessive frequency or insufficient frequency.

[0008] The utility model solves the technical problem by adopting the following technical scheme: an automatic energy-saving control system for a circulating pump, comprising a 1# evaporating kettle, a 2# evaporating kettle, a 3# evaporating kettle, a 4# evaporating kettle, a 1# precooling tank, a 2# precooling tank, a 1# water-cooling crystallization tank, a 2# water-cooling crystallization tank, a brine refrigeration unit, a DCS control cabinet, a DCS engineer station, a circulating pump of a purifying liquid device, a circulating pump frequency signal transmission line, an equipment operation signal transmission line, a temperature signal transmission line, a refrigeration unit start-up signal line, a water-cooling crystallization tank operation signal transmission line and a DCS engineer station network line. The 1# evaporating kettle, the 2# evaporating kettle, the 3# evaporating kettle, the 4# evaporating kettle, the 1# precooling tank, the 2# precooling tank and the brine refrigeration unit are all connected to the DCS control cabinet through the equipment operation signal transmission line, and the DCS control cabinet and the brine refrigeration unit are connected with the equipment operation signal transmission line. Transmission line, one side of the equipment operation signal transmission line is provided with 1# evaporator, 2# evaporator, 3# evaporator and 4# evaporator, and the other side of the equipment operation signal transmission line is provided with 1# precooling tank, 2# precooling tank, 1# water-cooling crystallization tank and 2# water-cooling crystallization tank, 1# evaporator, 2# evaporator, 3# evaporator, 4# evaporator, 1# precooling tank and 2# precooling tank are all connected with the equipment operation signal transmission line; 1# water-cooling crystallization tank and 2# water-cooling crystallization tank are connected with the DCS control cabinet through the water-cooling crystallization tank operation signal transmission line; both ends of the brine refrigeration unit are connected with the DCS control cabinet through the temperature signal transmission line and the refrigeration unit start signal line respectively; the circulating pump of the purification equipment is connected with the DCS control cabinet through the circulating pump frequency signal transmission line; the DCS control cabinet is connected with the DCS engineer station through the DCS engineer station network cable.

[0009] The beneficial effects of the utility model are as follows: the utility model effectively solves a series of problems caused by the manual operation of frequency increase, frequency decrease or shutdown of the circulating pump of the liquid purification equipment. The automatic regulating system of the circulating pump utilizes the number of running equipment and the temperature of the refrigeration unit. When the interlocking program of the DCS engineer station determines that the conditions are met, the circulating pump frequency of the liquid purification equipment is adjusted to reduce the occurrence of low frequency, thereby avoiding possible equipment damage due to low frequency and energy waste caused by continuous high frequency output. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The utility model is further described below in conjunction with the accompanying drawings and specific implementation methods.

[0011] Figure 1 It is a structural schematic diagram of the utility model.

[0012] Figure 2 It is a flow chart of the utility model.

[0013] Numbers in the figure:

[0014] 1. 1# evaporator, 2. 2# evaporator, 3. 3# evaporator, 4. 4# evaporator, 5. 1# precooling tank, 6. 2# precooling tank, 7. 1# water-cooling crystallization tank, 8. 2# water-cooling crystallization tank, 9. Brine refrigeration unit, 10. DCS control cabinet, 11. DCS engineer station, 12. Liquid purification equipment circulation pump, 13. Circulation pump frequency signal transmission line, 14. Equipment operation signal transmission line, 15. Temperature signal transmission line, 16. Refrigeration unit start signal line, 17. Water-cooled crystallization tank operation signal transmission line, 18. DCS engineer station network cable. DETAILED DESCRIPTION

[0015] like Figure 1 As shown in FIG. 2 , an automatic energy-saving control system for a circulating pump comprises a 1# evaporating kettle 1, a 2# evaporating kettle 2, a 3# evaporating kettle 3, a 4# evaporating kettle 4, a 1# precooling tank 5, a 2# precooling tank 6, a 1# water-cooling crystallization tank 7, a 2# water-cooling crystallization tank 8, a brine refrigerating unit 9, a DCS control cabinet 10, a DCS engineer station 11, a circulating pump of a purifying device 12, a circulating pump frequency signal transmission line 13, an equipment operation signal transmission line 14, a temperature signal transmission line 15, a refrigerating unit start signal line 16, a water-cooling crystallizing tank operation signal transmission line 17 and a DCS engineer station network line 18. The 1# evaporating kettle 1, the 2# evaporating kettle 2, the 3# evaporating kettle 3, the 4# evaporating kettle 4, the 1# precooling tank 5, the 2# precooling tank 6 and the brine refrigerating unit 9 are all connected to the DCS control cabinet 10 through the equipment operation signal transmission line 14. The DCS control cabinet 10 and the brine refrigerating unit 9 are connected with the equipment operation signal transmission line 14. The equipment operation signal transmission line 14 is connected between the DCS control cabinet 10 and the brine refrigerating unit 9. One side of the signal transmission line 14 is provided with 1# evaporator 1, 2# evaporator 2, 3# evaporator 3 and 4# evaporator 4, and the other side of the equipment operation signal transmission line 14 is provided with 1# precooling tank 5, 2# precooling tank 6, 1# water-cooling crystallization tank 7 and 2# water-cooling crystallization tank 8, and 1# evaporator 1, 2# evaporator 2, 3# evaporator 3, 4# evaporator 4, 1# precooling tank 5 and 2# precooling tank 6 are all connected to the equipment operation signal transmission line 14; 1# water-cooling crystallization tank 7 and 2# water-cooling crystallization tank 8 are connected to the DCS control cabinet 10 through the water-cooling crystallization tank operation signal transmission line 17; both ends of the brine refrigeration unit 9 are respectively connected to the DCS control cabinet 10 through the temperature signal transmission line 15 and the refrigeration unit start signal line 16; the liquid purification equipment circulation pump 12 is connected to the DCS control cabinet 10 through the circulation pump frequency signal transmission line 13; the DCS control cabinet 10 is connected to the DCS engineer station 11 through the DCS engineer station network cable 18.

[0016] During use, the nickel sulfate pre-evaporation liquid is injected into 1# evaporator 1, 2# evaporator 2, 3# evaporator 3 and 4# evaporator 4, and the temperature is raised to boiling point by 120°C high-temperature steam. The water jet vacuum unit extracts the acid mist in the kettle to lower the boiling point of the solution, and the water in the solution is vaporized. The vaporized water vapor is transferred to the plate exchanger for heat transfer with the circulating water and condensed into small water droplets. The nickel sulfate solution with a specific gravity of 1.3 to 1.4 after evaporation is pumped into 1# pre-cooling tank 5 and 2# pre-cooling tank 6, and the circulating water is used to transfer heat with the solution. The temperature is lowered to below 40°C; when the temperature of 1# precooling tank 5 and 2# precooling tank 6 is lowered to about 40°C, the nickel sulfate solution is pumped into 1# water-cooling crystallization tank 7 and 2# water-cooling crystallization tank 8, the temperature is lowered to about -18°C, and then the nickel sulfate is produced by filter pressing; the control system connects seven devices, 1# evaporator 1, 2# evaporator 2, 3# evaporator 3, 4# evaporator 4, 1# precooling tank 5, 2# precooling tank 6 and brine refrigeration unit 9, to the DCS control cabinet 10 in the factory through the equipment operation signal transmission line 13.

[0017] The liquid purification equipment circulation pump 12 is mainly used to cool down the 1# evaporator 1, 2# evaporator 2, 3# evaporator 3, 4# evaporator 4, 1# pre-cooling tank 5 and 2# pre-cooling tank 6. The minimum frequency of the liquid purification equipment circulation pump 12 must be maintained at 25 Hz to replenish water; the 1# water-cooled crystallization tank 7 and the 2# water-cooled crystallization tank 8 are in a chain relationship with the brine refrigeration unit 9. If the 1# water-cooled crystallization tank 7 and the 2# water-cooled crystallization tank 8 are started, the brine refrigeration unit 9 will be started, but if the 1# water-cooled crystallization tank 7 and the 2# water-cooled crystallization tank 8 are stopped, the temperature of the brine refrigeration unit 9 must be greater than ten degrees Celsius before it can be shut down, so the temperature of the brine refrigeration unit 9 needs to be set; an automatic adjustment interlocking program for the liquid purification equipment circulation pump 12 is set up in the DCS engineer station 11, and the equipment operation signal transmitted by the control module in the DCS control cabinet 10 and the temperature signal of the brine refrigeration unit 9 are monitored, and a judgment is made, and the temperature of the brine refrigeration unit 9 is set according to the set The frequency of the circulating pump 12 of the liquid purification equipment is adjusted according to the number of running equipment; after the 1# water-cooled crystallization tank 7 and the 2# water-cooled crystallization tank 8 are started, the brine refrigeration unit 9 is also started, and the brine refrigeration unit 9 cools the 1# water-cooled crystallization tank 7 and the 2# water-cooled crystallization tank 8 through circulating water. The continuous operation of the brine refrigeration unit 9 can reduce the temperature of the antifreeze to about -20°C, and cool the nickel sulfate solution in the 1# water-cooled crystallization tank 7 and the 2# water-cooled crystallization tank 8; when the equipment is started, the DCS control cabinet 10 will send an instruction to the circulating pump 12 of the liquid purification equipment, and the circulating pump 12 of the liquid purification equipment will control its frequency according to the number of started equipment, so that the energy loss can be effectively reduced, the supply of circulating water can be met, and the damage of the evaporator can be avoided. The pre-cooling tank and the water-cooled crystallization tank will not experience slow cooling. After all the equipment is shut down, the circulating water will continue to flow, and the equipment will not be damaged due to freezing.

[0018] When the ambient temperature is low (November to April), if two to four devices are started, the frequency of the liquid purification equipment circulation pump 12 can be adjusted to 30 Hz. If five to seven devices are started, the frequency of the liquid purification equipment circulation pump 12 must be adjusted to 40 Hz. If four to five devices are started, the frequency of the liquid purification equipment circulation pump 12 must be adjusted to 35 Hz to meet the functions of water supply and cooling. When the ambient temperature rises (May to October), the equipment corresponding to the liquid purification equipment circulation pump 12 will all increase by 5 Hz on the original basis to meet the refrigeration needs and the demand for circulating water usage.

Claims

1. An automatic energy-saving control system for a circulating pump, characterized in that: It comprises a 1# evaporator (1), a 2# evaporator (2), a 3# evaporator (3), a 4# evaporator (4), a 1# precooling tank (5), a 2# precooling tank (6), a 1# water-cooling crystallization tank (7), a 2# water-cooling crystallization tank (8), a brine refrigeration unit (9), a DCS control cabinet (10), a DCS engineer station (11), a liquid purification equipment circulating pump (12), a circulating pump frequency signal transmission line (13), an equipment operation signal transmission line (14), a temperature signal transmission line (15), a refrigeration unit start signal line (16), a water-cooling crystallization tank operation signal transmission line (17) and a DCS engineer station network cable (18), wherein the 1# evaporator (1), the 2# evaporator (2), the 3# evaporator (3), the 4# evaporator (4), the 1# precooling tank (5), the 2# precooling tank (6) and the brine refrigeration unit (9) are all connected to the DCS control cabinet (10) via the equipment operation signal transmission line (14); The 1# water-cooled crystallization tank (7) and the 2# water-cooled crystallization tank (8) are connected to the DCS control cabinet (10) via a water-cooled crystallization tank operation signal transmission line (17); both ends of the brine refrigeration unit (9) are connected to the DCS control cabinet (10) via a temperature signal transmission line (15) and a refrigeration unit start signal line (16); the liquid purification equipment circulation pump (12) is connected to the DCS control cabinet (10) via a circulation pump frequency signal transmission line (13); and the DCS control cabinet (10) is connected to the DCS engineer station (11) via a DCS engineer station network cable (18).

2. The automatic energy-saving control system for a circulating pump according to claim 1 is characterized in that: An equipment operation signal transmission line (14) is connected between the DCS control cabinet (10) and the brine refrigeration unit (9). A No. 1 evaporator (1), a No. 2 evaporator (2), a No. 3 evaporator (3), and a No. 4 evaporator (4) are provided on one side of the equipment operation signal transmission line (14). A No. 1 precooling tank (5), a No. 2 precooling tank (6), a No. 1 water-cooled crystallization tank (7), and a No. 2 water-cooled crystallization tank (8) are provided on the other side of the equipment operation signal transmission line (14). The No. 1 evaporator (1), the No. 2 evaporator (2), the No. 3 evaporator (3), the No. 4 evaporator (4), the No. 1 precooling tank (5), and the No. 2 precooling tank (6) are all connected to the equipment operation signal transmission line (14).

3. The automatic energy-saving control system for a circulating pump according to claim 1 is characterized in that: The 1# water-cooled crystallization tank (7) and the 2# water-cooled crystallization tank (8) are in a chain relationship with the brine refrigeration unit (9).

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