Cooling water system with dosing device

Abstract

The utility model discloses a cooling water system with a dosing device, which comprises a circulating water tank, a circulating water pump, a water chilling unit and a heat exchanger which are sequentially communicated end to end through pipelines, a water inlet valve is arranged on the pipeline for communicating the circulating water pump and the circulating water tank, and a water outlet valve is arranged on the pipeline for communicating the circulating water pump and the water chilling unit. The dosing device comprises a dosing tank, and the bottom of the dosing tank is communicated with a pipeline between the water inlet valve and the circulating water pump through a dosing pipe; a first valve, a dosing sight glass and a second valve are sequentially arranged on the dosing pipe at the bottom of the dosing tank from top to bottom; and a negative pressure meter is arranged on the pipeline between the second valve and the circulating water pump. The dosing device is arranged between the circulating water tank and the circulating water pump, precise dosing is achieved through the negative suction effect of an inlet of the circulating water pump, time and labor are saved, and practicability and convenience are achieved.

Description

Technical Field

[0001] The utility model relates to the field of chemical production equipment, in particular to a cooling water system with a dosing device. Background Art

[0002] During chemical production, most equipment and processes generate significant amounts of heat. If not promptly cooled, this can negatively impact equipment performance, efficiency, and lifespan. Therefore, chemical production lines typically incorporate cooling water systems. These systems utilize heat exchangers to exchange heat with high-temperature process fluids, absorbing the fluid's heat and cooling it down to achieve a stable operating temperature. This heat exchange mechanism is based on heat conduction and convection. The low-temperature cooling water absorbs heat, raising its temperature before returning to the cooling system and cooling down to the desired temperature.

[0003] At present, the common process flow of the cooling water system is to set up a circulating water tank, then introduce industrial water into the circulating water tank, and set up a circulating water pump at the outlet of the circulating water tank. The circulating water pump transports the water to the chiller to cool it to the required temperature, and finally returns to the circulating water tank after removing heat through the chemical production heat exchanger. The cycle is repeated in sequence, and the heat is removed from the chemical equipment by changing the water temperature. The principle of water circulation is to continuously cool the cooling water to a constant low temperature through the refrigeration equipment, and drive the circulation flow through the circulating water pump to ensure that the heat generated in the process can be effectively removed, while achieving efficient energy utilization and environmental protection.

[0004] During operation, in order to ensure that the water quality in the cooling water system meets the standards, it is necessary to regularly add scale inhibitors, bactericides and other chemicals. However, in the original dosing process, the following problems exist: (1) When adding chemicals, holes are usually opened on the top of the circulating water tank for dosing. However, due to the large size and high height of the circulating water tank, manual handling and dosing are time-consuming and labor-intensive, and the use of a crane to assist in dosing will increase the dosing cost and increase production costs; (2) Since the circulating water tank is usually set outdoors, the outer wall of the circulating water tank is prone to ice in rainy and snowy weather in winter. There is a risk of workers slipping and falling during the dosing process, which poses a great safety hazard. Utility Model Content

[0005] The utility model provides a cooling water system with a dosing device, aiming to solve the problems of inconvenient dosing, high dosing cost and great safety hazards in the existing cooling water system.

[0006] To achieve its purpose, the utility model adopts the following technical solutions:

[0007] A cooling water system with a dosing device comprises a circulating water tank, a circulating water pump, a chiller and a heat exchanger connected end to end via a pipeline, wherein the pipeline connecting the circulating water pump and the circulating water tank is provided with an inlet valve, and the pipeline connecting the circulating water pump and the chiller is provided with an outlet valve. The dosing device comprises a dosing tank, the bottom of which is connected to the pipeline between the inlet valve and the circulating water pump via a dosing pipe; the dosing pipe at the bottom of the dosing tank is provided with a first valve, a dosing sight glass and a second valve in sequence from top to bottom; and a negative pressure gauge is provided on the pipeline between the second valve and the circulating water pump.

[0008] Furthermore, a dosing port is provided on the top of the dosing tank.

[0009] Furthermore, the dosing sight glass is an impeller sight glass with a rotor.

[0010] Furthermore, a liquid level gauge is provided on the dosing tank.

[0011] Furthermore, the range of the negative pressure gauge is -0.1Mpa to 0.1Mpa.

[0012] Furthermore, the water inlet valve, the water outlet valve, the first valve and the second valve are all turbine ball valves.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0014] 1. The cooling water system provided by the utility model is provided with a dosing device between the circulating water tank and the circulating water pump. Accurate dosing is achieved through the dosing tank with liquid level, the first valve, the second valve and the negative pressure gauge in conjunction with the negative suction effect of the circulating water pump inlet, replacing the traditional manual dosing method, which is more time-saving and labor-saving. Moreover, the dosing operation can be completed indoors, eliminating the safety hazard of slipping and falling in rainy and snowy weather in winter, and is practical and convenient.

[0015] 2. The cooling water system provided by this utility model uses an impeller sight glass with a rotor, which facilitates observation of the flow direction and flow rate of the drug in the dosing pipe. The inlet valve, outlet valve, first valve, and second valve are all turbine ball valves, which have good sealing performance and facilitate flow control. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the cooling water system structure of the utility model;

[0017] In the figure: 1-circulating water tank; 2-water inlet valve; 3-pipeline; 4-circulating water pump; 5-water outlet valve; 6-chiller; 7-heat exchanger; 8-dosing tank; 9-first valve; 10-dosing sight glass; 11-second valve; 12-negative pressure gauge; 13-dosing pipe; 14-dosing port. DETAILED DESCRIPTION

[0018] The present invention will be further described below with reference to the accompanying drawings:

[0019] like Figure 1 As shown, the present invention is a cooling water system with a dosing device, comprising a circulating water tank 1, a circulating water pump 4, a chiller 6, and a heat exchanger 7, connected end-to-end via a pipe 3. The pipe 3 is connected to each component using flanges, and metal spiral wound gaskets are used at each connection to prevent leakage. The pipe 3 connecting the circulating water pump 4 to the circulating water tank 1 is equipped with an inlet valve 2, and the pipe 3 connecting the circulating water pump 4 to the chiller 6 is equipped with an outlet valve 5. The dosing device includes a dosing tank 8 with a dosing port 14 at the top. The dosing tank 8 is equipped with a liquid level gauge. The bottom of the dosing tank 8 is connected to the pipe 3 between the rear end of the water inlet valve 2 and the circulating water pump 4 via a dosing pipe 13. The dosing pipe 13 at the bottom of the dosing tank 8 is equipped with, from top to bottom, a first valve 9, a dosing sight glass 10, and a second valve 11. The dosing sight glass 10 is an impeller sight glass with a rotor. A negative pressure gauge 12 with a range of -0.1 MPa to 0.1 MPa is installed on the pipe 3 between the second valve 11 and the circulating water pump 4 to facilitate monitoring of the negative pressure at the suction port of the circulating water pump 4 during dosing. The water inlet valve 2, water outlet valve 5, first valve 9, and second valve 11 are all turbine ball valves for convenient flow control.

[0020] During chemical production, when using a 5°C cooling water system, first perform a leak test on all pipes and fittings in the system at a pressure of 1.0 MPa to prevent leaks during circulation. Then, add industrial primary water to the circulating water tank 1, close the first valve 9 and second valve 11 on the dosing pipe 13 of the dosing tank 8, and start the 5°C cooling water system to circulate, ensuring stable outlet pressure and flow at the circulating water pump 4. The circulating water pump 4 delivers water to the chiller 6 for cooling. The cooled water, now cooled to 5°C, passes through the heat exchanger 7 and comes into contact with the chemical materials to remove heat. After the heat is removed, the water flows through pipe 3 to the circulating water tank 1, repeating the cycle.

[0021] When scale inhibitors need to be added regularly, first add the liquid scale inhibitor to the dosing tank 8. Stop dosing when the liquid level in the dosing tank 8 reaches the upper middle position. Open the first valve 9 and observe the level of the scale inhibitor displayed in the dosing sight glass 10. Then, slowly adjust and close the inlet valve 2 of the circulating water pump 4. When the negative pressure gauge 12 shows -0.05 MPa, stop closing the inlet valve 2 of the circulating water pump 4. When adjusting the negative pressure in the pipeline 3, ensure that the outlet pressure of the circulating water pump 4 is stable to prevent cavitation. Next, slowly open the second valve 11 and observe the impeller in the dosing sight glass 10 rotating toward the pump body of the circulating water pump 4. Continue dosing until the liquid level in the dosing tank 8 drops to 0. Immediately close the second valve 11 and the first valve 9. Slowly fully open the inlet valve 2 of the circulating water pump 4 to complete dosing.

Claims

1. A cooling water system with a dosing device, comprising a circulating water tank (1), a circulating water pump (4), a chiller (6) and a heat exchanger (7) connected end to end via a pipe (3), wherein the pipe (3) connecting the circulating water pump (4) and the circulating water tank (1) is provided with an inlet valve (2), and the pipe (3) connecting the circulating water pump (4) and the chiller (6) is provided with an outlet valve (5), characterized in that: The dosing device comprises a dosing tank (8), the bottom of the dosing tank (8) is connected to a pipe (3) between a water inlet valve (2) and a circulating water pump (4) via a dosing pipe (13); a first valve (9), a dosing sight glass (10) and a second valve (11) are sequentially provided on the dosing pipe (13) at the bottom of the dosing tank (8) from top to bottom; and a negative pressure gauge (12) is provided on the pipe (3) between the second valve (11) and the circulating water pump (4).

2. A cooling water system with a dosing device according to claim 1, characterized in that: A dosing port (14) is provided on the top of the dosing tank (8).

3. A cooling water system with a dosing device according to claim 2, characterized in that: The dosing sight glass (10) is an impeller sight glass with a rotor.

4. A cooling water system with a dosing device according to claim 3, characterized in that: The dosing tank (8) is provided with a liquid level gauge.

5. A cooling water system with a dosing device according to claim 4, characterized in that: The measuring range of the negative pressure gauge (12) is -0.1 MPa to 0.1 MPa.

6. A cooling water system with a dosing device according to any one of claims 1 to 5, characterized in that: The water inlet valve (2), the water outlet valve (5), the first valve (9) and the second valve (11) are all turbine ball valves.

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