Backwater pipeline of cooling tower of negative pressure unit

Abstract

The utility model discloses a backwater pipeline of a cooling tower of a negative pressure unit, which comprises a negative pressure unit area formed by arranging a plurality of negative pressure units in parallel; the water outlet of the negative pressure unit area is connected with the circulating water tank, and water discharged from the negative pressure unit area enters the circulating water tank; the water inlet end of the cooling tower is connected with the circulating water tank, and the water outlet end is connected with the negative pressure unit area; the flow regulation drainage pipeline is connected with the negative pressure unit in parallel; the water inlet end of the flow regulation drainage pipeline is connected with the cooling tower; a circulating water pump is arranged between the circulating water tank and the cooling tower, and water in the circulating water tank passes through the cooling tower, then enters the negative pressure unit area and the flow adjusting drainage pipeline and finally returns to the circulating water tank. Cooling water entering a negative pressure unit area is shunted by adding a flow adjusting drainage pipeline, so that normal operation of the started negative pressure unit is ensured, and meanwhile, overlarge load cannot be caused to the negative pressure unit.

Description

Technical Field

[0001] The utility model relates to the technical field of tobacco processing equipment, in particular to a water return pipeline of a cooling tower of a negative pressure unit. Background Art

[0002] Negative pressure machine is an indispensable processing equipment in the tobacco processing industry. When drying tobacco leaves, the negative pressure machine can evaporate the water in the tobacco leaves through the negative pressure to achieve the drying of tobacco leaves. By controlling the operating parameters of the negative pressure machine, the drying speed and temperature of the tobacco leaves can be adjusted to meet the drying requirements of different tobacco leaves. When baking tobacco leaves, the negative pressure machine can bake the tobacco leaves through the combined effect of negative pressure and hot air. During the baking process of tobacco leaves, some impurities and bad tastes can be removed to improve the quality and taste of tobacco leaves. In the aging of tobacco leaves, the negative pressure machine can realize the aging process of tobacco leaves through negative pressure and humidity control. Tobacco leaf aging can improve the aroma and taste of tobacco leaves, making them softer and more mature. In tobacco leaf storage, the negative pressure machine can realize the storage of tobacco leaves through negative pressure control. Negative pressure can prevent tobacco leaves from moisture, mildew and insect pests, and maintain the quality and shelf life of tobacco leaves. In general, negative pressure machines play a key role in drying, baking, aging and storage in the tobacco industry, helping to improve the quality and taste of tobacco leaves and ensure the stability and reliability of tobacco products.

[0003] Therefore, cigarette processing plants will be equipped with multiple parallel negative pressure units according to the upper limit of processing and production needs. The negative pressure unit needs cooling water to circulate during operation. Therefore, the cooling water enters the circulating water tank through the cooling tower pipeline of the negative pressure unit. The cooling water is lifted to the cooling tower by the circulating water pump. After cooling, it enters the negative pressure unit through the pipeline. On the one hand, it provides the negative pressure unit for producing negative pressure, and on the other hand, it is used to cool the negative pressure unit. If the water intake of the negative pressure unit is too large, it will cause high energy consumption of the negative pressure unit. If the water intake is too small, the production pressure cannot be reached or no negative pressure is generated.

[0004] However, the processing and production needs are not fixed nowadays, and not all negative pressure units need to be turned on at all production times. Since the flow rate of the total water supply pipeline is fixed and cannot be adjusted, if the water intake is too large, the negative pressure unit will consume a lot of energy, and if the water intake is too small, the production pressure will not be reached or no negative pressure will be generated. As a result, when the production requirements only require the opening of some negative pressure units, the water intake needs to be adjusted. At this time, the drainage pipeline of the opened unit needs to be closed, and the drainage pipeline of the negative pressure unit that is not turned on needs to be opened, so that part of the cooling water can be directly discharged to the circulating water tank. At the same time, it is necessary to control the opening of the drainage valve of the negative pressure unit that is not turned on to ensure the amount of cooling water required to turn on the negative pressure unit. Excessive drainage will cause insufficient water to run the negative pressure unit, resulting in insufficient gas production and heat generation. If the drainage volume is too small, the load of the negative pressure unit will be increased. At the same time, the circulating water cooled by the cooling tower passes through the negative pressure unit, causing the water temperature to rise and increase the starting frequency of the cooling fan of the cooling tower. Summary of the invention

[0005] In order to solve the existing technical problems, the purpose of the utility model is to provide a negative pressure unit cooling tower return pipeline, by adding a drainage pipeline to the cooling tower outlet pipe and controlling its opening separately, thereby realizing the control of the cooling water flow entering the negative pressure unit. The specific contents are as follows:

[0006] A water return pipeline of a cooling tower of a negative pressure unit, comprising:

[0007] The negative pressure unit area consists of several negative pressure units arranged in parallel;

[0008] A circulating water tank, the drainage outlet of the negative pressure unit area is connected to the circulating water tank, and the water discharged from the negative pressure unit area enters the circulating water tank;

[0009] A cooling tower, whose water inlet is connected to the circulating water tank and whose water outlet is connected to the negative pressure unit area;

[0010] A flow regulating drainage pipeline is connected in parallel with the negative pressure unit; the water inlet end of the flow regulating drainage pipeline is connected to the cooling tower, and the water outlet end is connected to the circulating water tank;

[0011] A circulating water pump is arranged between the circulating water tank and the cooling tower. The water in the circulating water tank respectively enters the negative pressure unit area and the flow regulating drainage pipeline after passing through the cooling tower, and finally returns to the circulating water tank.

[0012] Furthermore, a heat exchanger is provided in the pipeline connecting the negative pressure unit area and the circulating water tank, and the high-temperature water flowing out of the negative pressure unit can exchange heat with other pipelines through the heat exchanger.

[0013] Furthermore, a heat exchanger is provided in the pipeline connecting the flow regulating drainage pipeline and the circulating water tank, and the low-temperature water flowing out of the flow regulating drainage pipeline can exchange heat with other pipelines through the heat exchanger.

[0014] Furthermore, the heat exchanger is a water-to-water heat exchanger or a water-to-gas heat exchanger.

[0015] Furthermore, the circulating water tank is also connected to a cooling water replenishment tank.

[0016] Furthermore, valves are provided at the water inlets and outlets of several negative pressure units in the negative pressure unit area; and valves are provided in the flow regulating drainage pipeline.

[0017] Furthermore, a thermometer and a flow meter are provided at the water outlet of the cooling tower; and thermometers and flow meters are provided at the water outlets of several negative pressure units in the negative pressure unit area.

[0018] Furthermore, a thermometer and a flow meter are provided at the water outlet of the heat exchanger.

[0019] The working principle of a negative pressure unit 1 cooling tower 3 return water pipeline is as follows:

[0020] During the production and processing, according to the number of negative pressure units 1 started, the opening of the valve 8 of the flow regulating drainage pipeline 4 is adjusted accordingly, so as to adjust the flow of cooling water entering the negative pressure unit 1 area through the cooling tower 3. The heat exchanger 6 of the flow regulating drainage pipeline 4 is used to exchange heat between the cooling water from the cooling tower 3 and other high-temperature pipes to cool it down. The heat exchanger 6 connected to the negative pressure unit 1 area is used to exchange heat between the high-temperature water from the negative pressure unit 1 and other low-temperature pipes to heat it up.

[0021] The utility model has the following beneficial effects compared with the prior art:

[0022] (I) By adding a flow regulating drainage pipeline to divert the cooling water entering the negative pressure unit area, the diversion flow is controlled by a valve; when only some negative pressure units are turned on, there is no need to turn on and off the valves of each negative pressure unit separately, so as to achieve single control; while ensuring the normal operation of the negative pressure unit, it will not cause excessive load to it, and at the same time avoid excessive cooling water passing through the negative pressure unit, which will increase the water temperature and increase the starting frequency of the cooling fan of the cooling tower.

[0023] (ii) Treat the hot and cold water returned to the circulating water tank separately to fully recover heat or cold energy and achieve energy conservation and emission reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of pipeline connection of the utility model;

[0025] In the figure:

[0026] 1—negative pressure unit; 2—circulating water tank; 3—cooling tower; 4—flow regulating drainage pipeline; 5—circulating water pump; 6—heat exchanger; 7—cooling water make-up tank; 8—valve; 9—thermometer; 10—flow meter. DETAILED DESCRIPTION

[0027] In order to make the technical means and creative features realized by the present invention and achieve the purpose of being easy to understand, the technical solution of the invention is further explained below in combination with one embodiment and a specific implementation method of a return water pipeline of a negative pressure unit cooling tower provided by the present invention.

[0028] like Figure 1 As shown, the specific embodiments given for the invention are as follows:

[0029] A water return pipeline of a negative pressure unit 1 and a cooling tower 3 comprises a negative pressure unit 1 area, a circulating water tank, a cooling tower 3, a flow regulating drainage pipeline 4 and a cooling water replenishment tank 7.

[0030] The negative pressure unit 1 area is connected in parallel by four negative pressure units 1; the drainage outlet of the negative pressure unit 1 area is connected to the circulating water tank, and the water discharged from the negative pressure unit 1 area enters the circulating water tank; the water inlet end of the cooling tower 3 is connected to the circulating water tank, and the water outlet end is connected to the negative pressure unit 1 area; the flow regulating drainage pipeline 4 is connected in parallel with the negative pressure unit 1; the water inlet end of the flow regulating drainage pipeline 4 is connected to the cooling tower 3, and the water outlet end is connected to the circulating water tank. The circulating water tank is also connected to a cooling water replenishment tank 7.

[0031] A circulating water pump 52 is provided between the circulating water tank and the cooling tower 3. The water in the circulating water tank passes through the cooling tower 3 and enters the negative pressure unit 1 area and the flow regulating drainage pipeline 4 respectively, and finally returns to the circulating water tank.

[0032] A heat exchanger 6 is provided in the pipeline connecting the negative pressure unit 1 area and the circulating water tank, and the high-temperature water flowing out of the negative pressure unit 1 can exchange heat with other pipelines through the heat exchanger 6.

[0033] A heat exchanger 6 is provided in the pipeline connecting the flow regulating drainage pipeline 4 and the circulating water tank, and the low-temperature water flowing out of the flow regulating drainage pipeline 4 can exchange heat with other pipelines through the heat exchanger 6. The heat exchanger 6 is a water-to-water heat exchanger 6 or a water-to-gas heat exchanger 6.

[0034] The water inlets and outlets of several negative pressure units 1 in the negative pressure unit 1 area are all provided with valves 8 ; and the flow regulating drainage pipeline 4 is provided with a valve 8 .

[0035] The water outlet of the cooling tower 3 is provided with a thermometer 9 and a flowmeter 10; the water outlets of several negative pressure units 1 in the negative pressure unit 1 area are provided with thermometers 9 and flowmeters 10. The water outlet of the heat exchanger 6 is provided with a thermometer 9 and a flowmeter 10.

[0036] During the production process, the valve 8 opening of the flow regulating drainage pipeline 4 is adjusted accordingly according to the number of negative pressure units 1 started, so as to adjust the flow of cooling water entering the negative pressure unit 1 area through the cooling tower 3. The heat exchanger 6 of the flow regulating drainage pipeline 4 is used to exchange heat between the cooling water from the cooling tower 3 and other high-temperature pipes to cool it down. The heat exchanger 6 connected to the negative pressure unit 1 area is used to exchange heat between the high-temperature water from the negative pressure unit 1 and other low-temperature pipes to heat it up. The processing capacity of this cooling tower 3 is 50m 3 / h, the motor flow of the circulating water pump 52 matches it; the cooling tower 3 and the circulating water pump 52 are designed for the full-load operation of four negative pressure units 1. Each negative pressure unit 1 requires 12m of cooling water when it is fully loaded. 3 / h. If two negative pressure units 1 are turned on, the flow regulating drainage pipeline 4 needs to be opened to a flow rate of 25m 3 / h, and let half of the cooling water be discharged to the circulating water tank through this pipeline. When the water level in the circulating water tank is too low, it can be replenished through the water replenishment tank. The thermometer 9 and the flowmeter 10 can monitor the entire water cycle, and it is convenient to check if there is any abnormal temperature or flow.

[0037] It should be understood that the above specific embodiments are only used to illustrate or explain the principles of the present invention, and do not constitute a limitation on the present invention. Therefore, any modifications, equivalent substitutions, improvements, etc. made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. The claims attached to the present invention are intended to cover all changes and modifications that fall within the scope and boundaries of the attached claims, or the equivalent forms of such scope and boundaries.

Claims

1. A negative pressure unit cooling tower return water pipeline, characterized in that: include: The negative pressure unit (1) area is composed of a plurality of negative pressure units (1) arranged in parallel; A circulating water tank, wherein the drainage outlet of the negative pressure unit (1) area is connected to the circulating water tank, and the water discharged from the negative pressure unit (1) area enters the circulating water tank; A cooling tower (3), whose water inlet end is connected to the circulating water tank, and whose water outlet end is connected to the negative pressure unit (1) area; A flow regulating drainage pipeline (4) is connected in parallel with the negative pressure unit (1); the water inlet end of the flow regulating drainage pipeline (4) is connected to the cooling tower (3), and the water outlet end is connected to the circulating water tank; A circulating water pump (5) (2) is provided between the circulating water tank and the cooling tower (3); the water in the circulating water tank passes through the cooling tower (3) and then enters the negative pressure unit (1) area and the flow regulating drainage pipeline (4) respectively, and finally returns to the circulating water tank.

2. A negative pressure unit cooling tower return water pipeline as claimed in claim 1, characterized in that: Place A heat exchanger (6) is provided in the pipeline connecting the negative pressure unit (1) area and the circulating water tank.

3. A negative pressure unit cooling tower return water pipeline as claimed in claim 1, characterized in that: Place A heat exchanger (6) is provided in the pipeline connecting the flow regulating drainage pipeline (4) and the circulating water tank.

4. A negative pressure unit cooling tower return water pipeline as claimed in claim 2 or 3, characterized in that: The heat exchanger (6) is a water-to-water heat exchanger (6) or a water-to-gas heat exchanger (6).

5. A negative pressure unit cooling tower return water pipeline as claimed in claim 1, characterized in that: Place The circulating water tank is also connected to a cooling water replenishment tank (7).

6. A water return pipeline for a cooling tower of a negative pressure unit as claimed in claim 1, characterized in that: Place The water inlets and outlets of the plurality of negative pressure units (1) in the negative pressure unit (1) area are all provided with valves (8); and the flow regulating drainage pipeline (4) is provided with a valve (8).

7. A water return pipeline for a cooling tower of a negative pressure unit as claimed in claim 1, characterized in that: Place A thermometer (9) and a flow meter (10) are provided at the water outlet of the cooling tower (3); and a thermometer (9) and a flow meter (10) are provided at the water outlets of a plurality of negative pressure units (1) in the negative pressure unit (1) area.

8. A negative pressure unit cooling tower return water pipeline as claimed in claim 2 or 3, characterized in that: A thermometer (9) and a flow meter (10) are provided at the water outlet of the heat exchanger (6).

Images