System for preparing process water from cooling water

Abstract

The utility model discloses a system for preparing process water from cooling water, and belongs to the field of heat exchange equipment. Comprising an evaporator, an absorber, a regenerator, a condenser and a water storage tank, the evaporator is connected with the water storage tank through a refrigerant supplementing pipeline, and the evaporator is connected with the condenser through a refrigerant circulating pipeline C; the absorber is connected with the condenser through a cooling water pipeline, and the absorber is connected with the regenerator through a concentrated liquid pipeline and a thin liquid pipeline; the water storage tank is connected with the thin liquid pipeline through a refrigerant circulating pipeline A; when the temperature of the cooling water is lower than the set temperature, the cooling water can be directly used for preparing process water through valve switching. The situation that when the temperature of cooling water is too low, the evaporation temperature is continuously lowered, cold water is continuously lowered, finally, a cold water heat transfer pipe is frozen to crack, and normal use of a unit is affected is avoided. And when the temperature of the cooling water exceeds a set value, the corresponding valve is closed and opened so as to complete a normal refrigeration process.

Description

Technical Field

[0001] The utility model belongs to the field of heat exchange equipment, and in particular relates to a system for preparing process water from cooling water. Background Art

[0002] In some areas with cold winters, the cooling water temperature may be lower than 6°C. Cooling water with too low a temperature will cause the refrigerant evaporation temperature to drop, causing the evaporator cold water heat transfer tube to freeze, resulting in problems with the use of the unit, and even more serious situations may cause the unit to be scrapped.

[0003] Under normal circumstances, if you want to use cooling water below 6℃, you need to add a plate heat exchanger in front of the unit to raise the cooling water temperature to a temperature that can be used for heating, but the cost is greatly increased and the time to recover the cost is greatly extended. If you do not add a plate heat exchanger and stop the unit in winter, this operation will cause great trouble for the maintenance and commissioning of the unit, thereby further increasing the cost of the user. Utility Model Content

[0004] The purpose of the utility model is to solve the problem that the temperature of cooling water in winter is too low in the prior art, which causes the unit shutdown alarm and other problems. A system for preparing process water with cooling water is provided. By switching the valve, when the cooling water temperature is lower than 6°C, the refrigerant can be evaporated by the evaporator, and the absorber absorbs the refrigerant vapor. The heat of the cold water can be transferred to the cooling water to heat it up, and no additional heat source is needed, so as to prepare process water for cooling water.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a system for preparing process water from cooling water, characterized in that it includes an evaporator, an absorber, a regenerator, a condenser, and a water storage tank; the evaporator is connected to the water storage tank through a refrigerant replenishment pipeline, and the evaporator is connected to the condenser through a refrigerant circulation pipeline C; the absorber is connected to the condenser through a cooling water pipeline, and the absorber is connected to the regenerator through a concentrated liquid pipeline and a dilute liquid pipeline; the water storage tank is connected to the dilute liquid pipeline through a refrigerant circulation pipeline A.

[0006] The refrigerant replenishing pipeline is connected to diaphragm valve four, the concentrated solution pipeline is connected to diaphragm valve two, the dilute solution pipeline is connected to diaphragm valve one and a dilute solution pump, and the refrigerant circulation pipeline A is connected to diaphragm valve three.

[0007] The evaporator is provided with a cold water inlet, a cold water outlet, and a refrigerant circulation pipeline B; the absorber is provided with a cooling water inlet and a concentrated liquid inlet; the regenerator is provided with a dilute liquid inlet, a heat source water inlet, a heat source water outlet, and a concentrated liquid outlet; the condenser is provided with a refrigerant circulation pipeline C outlet and a cooling water outlet.

[0008] The refrigerant circulation pipeline B is connected to a refrigerant pump.

[0009] When the cooling water is lower than the set temperature, the utility model can directly realize the production of process water from the cooling water by switching the valve. This avoids the situation that when the cooling water temperature is too low, the evaporation temperature continues to drop, the cold water also continues to drop, and finally the cold water heat transfer pipe is frozen and cracked, which affects the normal use of the unit. When the cooling water temperature exceeds the set value, the corresponding valve is closed and opened to complete the normal refrigeration process. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0011] In the figure, dilute liquid pump 1, refrigerant pump 2, diaphragm valve one 3, diaphragm valve two 4, diaphragm valve three 5, diaphragm valve four 6, water storage tank 7, refrigerant circulation pipeline A 8, refrigerant replenishing pipeline 9, cooling water inlet 10, cold water outlet 11, refrigerant circulation pipeline B 12, dilute liquid pipeline 13, concentrated liquid pipeline 14, heat source water inlet 15, heat source water outlet 16, cold water inlet 17, cooling water outlet 18, refrigerant circulation pipeline C 19, condenser 20, regenerator 21, evaporator 22, absorber 23. DETAILED DESCRIPTION

[0012] The utility model is further described below in conjunction with the accompanying drawings and specific embodiments: Example

[0013] like Figure 1 As shown, a system for preparing process water from cooling water includes an evaporator 22, an absorber 23, a regenerator 21, a condenser 20, and a water storage tank 7; the evaporator 22 is connected to the water storage tank 7 via a refrigerant replenishment pipeline 9, and the evaporator 22 is connected to the condenser 20 via a refrigerant circulation pipeline C19; the absorber 23 is connected to the condenser 20 via a cooling water pipeline, and the absorber 23 is connected to the regenerator 21 via a concentrated solution pipeline 14 and a diluted solution pipeline 13; the water storage tank 7 is connected to the diluted solution pipeline 13 via a refrigerant circulation pipeline A8.

[0014] The refrigerant replenishing pipeline 9 is connected to a diaphragm valve four 6, the concentrated solution pipeline 14 is connected to a diaphragm valve two 4, the dilute solution pipeline 13 is connected to a diaphragm valve one 3 and a dilute solution pump 1, and the refrigerant circulation pipeline A8 is connected to a diaphragm valve three 5.

[0015] The evaporator 22 is provided with a cold water inlet 17, a cold water outlet 11, and a refrigerant circulation pipeline B12; the absorber 23 is provided with a cooling water inlet 10 and a concentrated liquid inlet; the regenerator 21 is provided with a dilute liquid inlet, a heat source water inlet 15, a heat source water outlet 16, and a concentrated liquid outlet; the condenser 20 is provided with a refrigerant circulation pipeline C19 outlet and a cooling water outlet 18.

[0016] The refrigerant circulation pipeline B12 is connected to a refrigerant pump 2 .

[0017] When the cooling water temperature is greater than 6°C, open diaphragm valve 2 4 and diaphragm valve 1 3, and close diaphragm valve 3 5 and diaphragm valve 4 6. To achieve summer cooling, the implementation process is as follows:

[0018] The cold water is cooled in the evaporator 22 by the low-temperature refrigerant from the condenser 20. The refrigerant absorbs the heat of the cold water and evaporates to become refrigerant vapor, which enters the absorber 23. The concentrated solution from the regenerator 21 drips into the absorber 23 through the concentrated solution pipeline 14 and is absorbed by it. The concentrated solution becomes a dilute solution.

[0019] The dilute lithium bromide solution in the absorber 23 is pumped to the regenerator 21 by the dilute solution pump 1. In the regenerator 21, the dilute lithium bromide solution is heated by the heat source water and concentrated into a concentrated lithium bromide solution. The concentrated lithium bromide solution enters the absorber 23 through the concentrated solution pipeline 14, drips on the cooling water pipe, absorbs the refrigerant vapor from the evaporator 22, and becomes a dilute solution. On the other hand, in the regenerator 21, the water vapor generated after the heat source water and the lithium bromide solution are added enters the condenser 20 to be cooled, and then passes through the condensation circulation pipeline C19 to become a low-temperature refrigerant, and then enters the evaporator 22, drips on the cold water pipe, and cools the cold water entering the evaporator 22.

[0020] When the cooling water temperature is less than 6°C, close the diaphragm valve 1 3 and the diaphragm valve 2 4, and open the diaphragm valve 3 5 and the diaphragm valve 4 6. Only use the evaporator 22 and the absorber 23 to realize the production of process water in winter. The detailed process is as follows:

[0021] Close the diaphragm valve 24, wait for the lithium bromide solution in the absorber 23 to be pumped into the regenerator 21 by the dilute liquid pump 1 through the dilute liquid pipeline 13, then close the dilute liquid pump 1, close the diaphragm valve 13, and the diaphragm valve 46, so that the refrigerant stored in the water tank 7 enters the evaporator 22 through the refrigerant replenishment pipeline 9. The refrigerant drips onto the cold water pipe, causing the refrigerant to evaporate into steam and diffuse into the absorber 23. Then, the refrigerant steam is condensed by the cooling water pipe and becomes refrigerant again. When there is a certain liquid level in the absorber 23, open the diaphragm valve 3 5 and the dilute liquid pump 1, so that the condensed refrigerant enters the water tank 7 through the refrigerant circulation pipeline A8. In this process, the cooling water will be heated by the steam. Thereby achieving the purpose of producing process water.

Claims

1. A system for producing process water from cooling water, characterized in that: The invention comprises an evaporator (22), an absorber (23), a regenerator (21), a condenser (20), and a water storage tank (7); the evaporator (22) is connected to the water storage tank (7) via a refrigerant supply pipeline (9), and the evaporator (22) is connected to the condenser (20) via a refrigerant circulation pipeline C (19); the absorber (23) is connected to the condenser (20) via a cooling water pipeline, and the absorber (23) is connected to the regenerator (21) via a concentrated liquid pipeline (14) and a diluted liquid pipeline (13); and the water storage tank (7) is connected to the diluted liquid pipeline (13) via a refrigerant circulation pipeline A (8).

2. A system for preparing process water from cooling water according to claim 1, characterized in that: The refrigerant replenishing pipeline (9) is connected to diaphragm valve four (6), the concentrated solution pipeline (14) is connected to diaphragm valve two (4), the diluted solution pipeline (13) is connected to diaphragm valve one (3) and a diluted solution pump (1), and the refrigerant circulation pipeline A (8) is connected to diaphragm valve three (5).

3. A system for preparing process water from cooling water according to claim 1, characterized in that: The evaporator (22) is provided with a cold water inlet (17), a cold water outlet (11), and a refrigerant circulation pipeline B (12); the absorber (23) is provided with a cooling water inlet (10) and a concentrated liquid inlet; the regenerator (21) is provided with a dilute liquid inlet, a heat source water inlet (15), a heat source water outlet (16), and a concentrated liquid outlet; the condenser (20) is provided with an outlet of a refrigerant circulation pipeline C (19) and a cooling water outlet (18).

4. A system for preparing process water from cooling water according to claim 3, characterized in that: The refrigerant circulation pipeline B (12) is connected to a refrigerant pump (2).

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