A chilled water plant

Abstract

The utility model relates to a kind of frozen water devices, mainly solve the problem that the temperature difference of frozen water inlet and outlet in prior art reaches not industrial demand and the operation efficiency of unit is low.The utility model is by using a new frozen water device, including first magnetic suspension refrigeration unit 1, control cabinet 6, second magnetic suspension refrigeration unit 7, first frozen water inlet end 12, second frozen water inlet end 13, frozen water outlet end 14, production equipment 15, frozen water buffer storage tank 16, frozen water circulating pump 17, cooling water tower 18, the technical scheme of cooling water circulating pump 19, the problem is preferably solved, and can be used in polyether polyol production industrial application.

Description

Technical Field

[0001] This utility model relates to the field of refrigeration technology, specifically to a chilled water device. Background Technology

[0002] In industrial production, chilled water systems are common equipment in factories, primarily used to cool production equipment and enable it to be put into operation more quickly. Especially in polyether polyol production plants, -5℃ chilled water systems are essential equipment. They mainly use heat exchangers to cool raw material tanks, reaction materials, and some pumps. Because these units have a large cooling capacity and high energy consumption, most companies use screw chillers. However, with the development of science and technology, low-temperature magnetic levitation chiller units have become increasingly mature. The biggest advantage of magnetic levitation technology is the integrated structure of the magnetic levitation bearing and compressor, completely eliminating mechanical contact and lubrication, thus greatly improving efficiency. Currently, the temperature difference between the inlet and outlet of chilled water in existing -5℃ magnetic levitation chiller units is generally around 5℃, and it is difficult to exceed 5℃. Generally speaking, in industrial production, especially in polyether polyol production plants, due to the large cooling capacity demand and unstable load, the temperature difference between the inlet and outlet of chilled water usually needs to reach 7℃, which ordinary -5℃ low-temperature magnetic levitation chiller units cannot meet.

[0003] Chinese patent CN203810786U discloses a series-connected refrigeration unit, including a controller, an evaporator group consisting of at least two evaporators connected in series, and at least two refrigeration units. The controller includes a processing module, a temperature detection module, and a drive module. The refrigeration units include a heat dissipation device and a compressor, condenser, check valve, filter, and expansion valve connected in series via a sealed metal pipe. The compressor of the refrigeration unit is electrically connected to the drive module of the controller, and the refrigeration unit and the evaporator group are connected in series via a metal pipe. This series-connected refrigeration unit can effectively improve the distribution of cold air in its installation location. This utility model is for temperature control in industrial plants above 0 degrees Celsius. The condenser is connected in series. As can be seen from the figure, the refrigeration units are connected in parallel rather than in series; the series connection is for the external condenser. The refrigeration unit is not magnetically levitated, and its temperature control addresses the temperature requirements of the polyether polyol production industry due to the temperature difference between the inlet and outlet of the chilled water. Utility Model Content

[0004] The technical problem to be solved by this utility model is that the temperature difference between the inlet and outlet of chilled water in the existing technology does not meet the industrial requirements and the operating efficiency of the unit is low. This utility model provides a new chilled water device that has the advantages of meeting the industrial requirements for the temperature difference between the inlet and outlet of chilled water and high operating efficiency.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: A chilled water device includes a first magnetic levitation chiller unit 1, a control cabinet 6, a second magnetic levitation chiller unit 7, a first chilled water inlet 12, a second chilled water inlet 13, a chilled water outlet 14, production equipment 15, a chilled water buffer storage tank 16, a chilled water circulation pump 17, a cooling tower 18, and a cooling water circulation pump 19; wherein, the first magnetic levitation chiller unit 1 includes a first evaporator 2, a first condenser 3, a first magnetic levitation compressor 4, and a second magnetic levitation compressor 5, and the second magnetic levitation chiller unit 7 includes a second evaporator 8, a second condenser 9, a third magnetic levitation compressor 10, and a fourth magnetic levitation compressor 11;

[0006] The first evaporator 2, the first condenser 3, the first magnetic levitation compressor 4, and the second magnetic levitation compressor 5 are connected by pipes to form a refrigeration cycle loop; the second evaporator 8, the second condenser 9, the third magnetic levitation compressor 10, and the fourth magnetic levitation compressor 11 are connected by pipes to form a refrigeration cycle loop.

[0007] In this system, the cooling water from the first condenser 3 passes through the cooling tower 18 and is then circulated into the first condenser 3 by the cooling water circulation pump 19, forming a closed-loop cooling water system; the cooling water from the second condenser 9 passes through the cooling tower 18 and is then circulated into the second condenser 9 by the cooling water circulation pump 19, forming a closed-loop cooling water system.

[0008] The first chilled water inlet 12, the first evaporator 2, the second evaporator 8, the production equipment 15, the chilled water buffer storage tank 16, and the chilled water circulation pump 17 are connected in series through pipelines to form a closed-loop chilled water system.

[0009] The control cabinet 6 is electrically connected to the first magnetic levitation compressor 4, the second magnetic levitation compressor 5, the third magnetic levitation compressor 10, and the fourth magnetic levitation compressor 11. A temperature sensor is installed at the chilled water outlet 14. The control cabinet 6 and the temperature sensor are electrically connected to continuously monitor the actual outlet temperature of the chilled water at the outlet 14. The control cabinet contains a control system. The control system uses the temperature deviation to calculate the current load demand and controls the operation of the magnetic levitation compressors.

[0010] In the above technical solution, preferably, the control system converts the calculated load demand percentage into a corresponding target rotation speed signal of the compressor head and sends it to the variable frequency drive of the magnetic levitation compressor, thereby driving the rotation speed of the compressor head rotor to achieve the required cooling load demand.

[0011] In the above technical solution, preferably, when the load demand is 75-100%, the control system controls the first magnetic levitation compressor 4, the second magnetic levitation compressor 5, the third magnetic levitation compressor 10, and the fourth magnetic levitation compressor 11 to operate simultaneously.

[0012] In the above technical solution, preferably, when the load demand is 50-75%, the control system automatically shuts down one of the magnetic levitation compressors.

[0013] In the above technical solution, preferably, when the load demand is 0-50%, the control system automatically shuts down two of the magnetic levitation compressors.

[0014] The chilled water device provided by this utility model monitors the temperature of the chilled water outlet 14 through the control system of the control cabinet, thereby controlling the number of corresponding magnetic levitation compressors in operation, thus improving operating efficiency; and through the series connection of the first magnetic levitation chiller unit 1 and the second magnetic levitation chiller unit 7, the temperature difference between the inlet and outlet of the chilled water meets industrial requirements, which generally needs to reach 7°C; thus achieving good technical results. Attached Figure Description

[0015] Appendix Figure 1 This is a schematic diagram of the structure of the chilled water device of this utility model;

[0016] Among them, 1 is the first magnetic levitation chiller unit, 2 is the first evaporator, 3 is the first condenser, 4 is the first magnetic levitation compressor, 5 is the second magnetic levitation compressor, 6 is the control cabinet, 7 is the second magnetic levitation chiller unit, 8 is the second evaporator, 9 is the second condenser, 10 is the third magnetic levitation compressor, 11 is the fourth magnetic levitation compressor, 12 is the first chilled water inlet, 13 is the second chilled water inlet, 14 is the chilled water outlet, 15 is the production equipment, 16 is the chilled water buffer tank, 17 is the chilled water circulation pump, 18 is the cooling tower, and 19 is the cooling water circulation pump. Detailed Implementation

[0017] To explain in detail the technical content, structural features, objectives and effects of this utility model, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0018] Example:

[0019] A chilled water system includes a first magnetic levitation chiller unit 1, a control cabinet 6, a second magnetic levitation chiller unit 7, a first chilled water inlet 12, a second chilled water inlet 13, a chilled water outlet 14, production equipment 15, a chilled water buffer tank 16, a chilled water circulation pump 17, a cooling tower 18, and a cooling water circulation pump 19; wherein, the first magnetic levitation chiller unit 1 includes a first evaporator 2, a first condenser 3, a first magnetic levitation compressor 4, and a second magnetic levitation compressor 5, and the second magnetic levitation chiller unit 7 includes a second evaporator 8, a second condenser 9, a third magnetic levitation compressor 10, and a fourth magnetic levitation compressor 11;

[0020] The first evaporator 2, the first condenser 3, the first magnetic levitation compressor 4, and the second magnetic levitation compressor 5 are connected by pipes to form a refrigeration cycle loop; the second evaporator 8, the second condenser 9, the third magnetic levitation compressor 10, and the fourth magnetic levitation compressor 11 are connected by pipes to form a refrigeration cycle loop.

[0021] In this system, the cooling water from the first condenser 3 passes through the cooling tower 18 and is then circulated into the first condenser 3 by the cooling water circulation pump 19, forming a closed-loop cooling water system; the cooling water from the second condenser 9 passes through the cooling tower 18 and is then circulated into the second condenser 9 by the cooling water circulation pump 19, forming a closed-loop cooling water system.

[0022] The first chilled water inlet 12, the first evaporator 2, the second evaporator 8, the production equipment 15, the chilled water buffer storage tank 16, and the chilled water circulation pump 17 are connected in series through pipelines to form a closed-loop chilled water system.

[0023] The control cabinet 6 is electrically connected to the first magnetic levitation compressor 4, the second magnetic levitation compressor 5, the third magnetic levitation compressor 10, and the fourth magnetic levitation compressor 11. A temperature sensor is installed at the chilled water outlet 14. The control cabinet 6 and the temperature sensor are electrically connected to continuously monitor the actual outlet temperature of the chilled water at the outlet 14. The control cabinet contains a control system. The control system uses the temperature deviation to calculate the current load demand and controls the operation of the magnetic levitation compressors.

[0024] The control system converts the calculated load demand percentage into a corresponding target rotation speed signal for the compressor head, and sends it to the variable frequency drive of the magnetic levitation compressor, thereby driving the rotation speed of the compressor head rotor to achieve the required cooling load demand.

[0025] When the load demand is 75-100%, the control system controls the first magnetic levitation compressor 4, the second magnetic levitation compressor 5, the third magnetic levitation compressor 10, and the fourth magnetic levitation compressor 11 to operate simultaneously.

[0026] When the load demand is 50-75%, the control system automatically shuts down one of the magnetic levitation compressors.

[0027] When the load demand is 0-50%, the control system automatically shuts down two of the magnetic levitation compressors.

[0028] This invention improves production efficiency by controlling the operation of the magnetic levitation compressor according to the required cooling load during production, and by connecting two magnetic levitation refrigeration units in series, the inlet and outlet temperature difference can reach the temperature difference required for industrial applications.

Claims

1. A chilled water device, comprising a first magnetic levitation chiller unit (1), a control cabinet (6), a second magnetic levitation chiller unit (7), a first chilled water inlet (12), a second chilled water inlet (13), a chilled water outlet (14), production equipment (15), a chilled water buffer tank (16), a chilled water circulation pump (17), a cooling tower (18), and a cooling water circulation pump (19); wherein, The first magnetic levitation refrigeration unit (1) includes a first evaporator (2), a first condenser (3), a first magnetic levitation compressor (4), and a second magnetic levitation compressor (5). The second magnetic levitation refrigeration unit (7) includes a second evaporator (8), a second condenser (9), a third magnetic levitation compressor (10), and a fourth magnetic levitation compressor (11). The first evaporator (2), the first condenser (3), the first magnetic levitation compressor (4), and the second magnetic levitation compressor (5) are connected by pipes to form a refrigeration cycle loop; the second evaporator (8), the second condenser (9), the third magnetic levitation compressor (10), and the fourth magnetic levitation compressor (11) are connected by pipes to form a refrigeration cycle loop. The cooling water of the first condenser (3) is circulated into the first condenser (3) by the cooling water tower (18) and then by the cooling water circulation pump (19) to form a closed-loop cooling water system; the cooling water of the second condenser (9) is circulated into the second condenser (9) by the cooling water circulation pump (19) after passing through the cooling water tower (18) to form a closed-loop cooling water system. The first chilled water inlet (12), the first evaporator (2), the second evaporator (8), the production equipment (15), the chilled water buffer tank (16), and the chilled water circulation pump (17) are connected in series through pipelines to form a closed-loop chilled water system. The control cabinet (6) is electrically connected to the first magnetic levitation compressor (4), the second magnetic levitation compressor (5), the third magnetic levitation compressor (10), and the fourth magnetic levitation compressor (11). A temperature sensor is provided at the chilled water outlet (14). The control cabinet (6) and the temperature sensor are electrically connected to continuously monitor the actual outlet temperature of the chilled water outlet (14). The control cabinet (6) contains a control system. The control system uses the temperature deviation to calculate the current load demand and controls the operation of the magnetic levitation compressor.

2. The chilled water apparatus according to claim 1, characterized in that, The control system converts the calculated load demand percentage into a corresponding target rotation speed signal for the compressor head, and sends it to the variable frequency drive of the magnetic levitation compressor, thereby driving the rotation speed of the compressor head rotor to achieve the required cooling load demand.

3. The chilled water apparatus according to claim 2, characterized in that, When the load demand is 75-100%, the control system controls the first magnetic levitation compressor (4), the second magnetic levitation compressor (5), the third magnetic levitation compressor (10), and the fourth magnetic levitation compressor (11) to operate simultaneously.

4. The chilled water apparatus according to claim 2, characterized in that, When the load demand is 50-75%, the control system automatically shuts down one of the magnetic levitation compressors.

5. The chilled water apparatus according to claim 2, characterized in that, When the load demand is 0-50%, the control system automatically shuts down two of the magnetic levitation compressors.

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