阅读说明：本技术 一种基于流量变化的冷却塔冷却系统及其应用 (Cooling tower cooling system based on flow change and application thereof ) 是由 陶思凡 李冠宇 谭超 于 2019-10-31 设计创作，主要内容包括：本发明涉及一种基于流量变化的冷却塔冷却系统,该冷却塔冷却系统与车间循环水连接,包括依次连接的进水管路、闭式冷却塔组和出水管路；所述闭式冷却塔组包括若干个并联连接的闭式冷却塔,并且该若干个闭式冷却塔的高能效区间对应的塔水流量范围不同；所述进水管路包括进水总管路和分别与各个闭式冷却塔连接的进水支管路,所述出水管路包括出水总管路和分别与各个闭式冷却塔连接的出水支管路；所述进水支管路和出水支管路上设有均设有切换阀门。与现有技术相比,本发明具有能耗低、延长设备寿命、运行稳定等优点。(The invention relates to a cooling tower cooling system based on flow change, which is connected with workshop circulating water and comprises a water inlet pipeline, a closed cooling tower set and a water outlet pipeline which are sequentially connected; the closed cooling tower group comprises a plurality of closed cooling towers which are connected in parallel, and the tower water flow ranges corresponding to the high-energy-efficiency intervals of the plurality of closed cooling towers are different; the water inlet pipeline comprises a water inlet main pipeline and water inlet branch pipelines respectively connected with the closed cooling towers, and the water outlet pipeline comprises a water outlet main pipeline and water outlet branch pipelines respectively connected with the closed cooling towers; and the water inlet branch pipeline and the water outlet branch pipeline are respectively provided with a switching valve. Compared with the prior art, the invention has the advantages of low energy consumption, prolonged service life of equipment, stable operation and the like.)

1. A cooling tower cooling system based on flow change is connected with workshop circulating water and is characterized by comprising a water inlet pipeline (1), a closed cooling tower set and a water outlet pipeline (2) which are sequentially connected; the closed cooling tower group comprises a plurality of closed cooling towers (3) which are connected in parallel, and the tower water flow ranges corresponding to the high-energy-efficiency intervals of the plurality of closed cooling towers (3) are different; the water inlet pipeline (1) comprises a water inlet main pipeline (11) and water inlet branch pipelines (12) respectively connected with the closed cooling towers (3), and the water outlet pipeline (2) comprises a water outlet main pipeline (21) and water outlet branch pipelines (22) respectively connected with the closed cooling towers (3); and the water inlet branch pipeline (12) and the water outlet branch pipeline (22) are respectively provided with a switching valve (4).

2. A flow rate variation based cooling tower cooling system according to claim 1, characterized in that the switching valve (4) is an electric valve.

3. A flow rate variation based cooling tower cooling system according to claim 1, characterized in that a flow meter (6) is installed on the water outlet pipeline (2).

4. A flow rate variation based cooling tower cooling system according to claim 3, wherein the flow meter (6) is a remote flow meter.

5. The cooling tower cooling system based on flow change is characterized by further comprising a PLC (programmable logic controller), wherein the PLC is in signal connection with the switching valve (4), the flow meter (6) and fan motor switches of the closed cooling towers.

6. The cooling tower cooling system based on flow change according to claim 1, wherein each of the associated inlet branch pipes (12) and outlet branch pipes (22) is further provided with a service valve (5) for isolating the corresponding closed cooling tower (3) from the corresponding switching valve (4) of the closed cooling tower (3).

7. A flow variation based cooling tower cooling system according to claim 1, characterized in that the closed cooling tower group comprises three closed cooling towers (3) connected in parallel.

8. A flow variation based cooling tower cooling system according to claim 1, characterised in that the frequency of the fan motor in the closed cooling tower (3) is controlled using wet bulb temperature.

9. Use of a cooling tower cooling system based on flow variation according to claim 1, comprising the steps of:

selecting a matched closed cooling tower (3) according to water flow, and completing pipeline selection through a switching valve (4);

and after the water flow is changed, selecting and opening the matched closed cooling tower (3) according to the changed water flow to enable the water flow to be in a tower water flow range corresponding to the high-energy-efficiency interval of the selected closed cooling tower (3), then closing the closed cooling tower (3) which is in operation before the water flow is changed, and completing pipeline switching through the switching valve (4).

10. The use of a flow variation based cooling tower system as claimed in claim 9, wherein the switching of the pipeline is performed after a delay determination after a change in water flow is detected.

Technical Field

The invention relates to cooling equipment, in particular to a cooling tower cooling system based on flow change and application thereof.

Background

The cooling device has wide application in the industries of petrifaction, oil refining, chemical fertilizer, coal chemical industry, metallurgy, electric power and the like. Cooling towers are relatively common cooling devices, and cooling towers are devices which use water as a circulating coolant to absorb heat from a system to be cooled and discharge the heat to the atmosphere so as to reduce the temperature of water. The existing cooling water system adopts a closed cooling tower, demand end equipment adopts temperature difference adjustment, multiple cooling towers are opened under general conditions to guarantee that when the load change of the demand end results in the change of cooling water flow, the frequency conversion of a fan motor can be relied on to adjust and match, and because the load changes greatly in different time periods, the frequency adjusting range is large, the fan motor can not operate in the optimal energy efficiency interval in most of time. Therefore, it is desirable to provide a cooling system that operates efficiently and consumes less power.

Disclosure of Invention

The invention aims to overcome the defects of high energy consumption, low automation degree and the like of the fan in the prior art.

The purpose of the invention can be realized by the following technical scheme:

a cooling tower cooling system based on flow change is connected with workshop circulating water and comprises a water inlet pipeline, a closed cooling tower set and a water outlet pipeline which are sequentially connected; the closed cooling tower group comprises a plurality of closed cooling towers which are connected in parallel, and the tower water flow ranges corresponding to the high-energy-efficiency intervals of the plurality of closed cooling towers are different; the water inlet pipeline comprises a water inlet main pipeline and water inlet branch pipelines respectively connected with the closed cooling towers, and the water outlet pipeline comprises a water outlet main pipeline and water outlet branch pipelines respectively connected with the closed cooling towers; and the water inlet branch pipeline and the water outlet branch pipeline are respectively provided with a switching valve.

The switching valve is an electric valve.

And a flow meter is arranged on the water outlet pipeline.

The flowmeter is a remote transmission flowmeter.

The invention also comprises a PLC controller which is in signal connection with the switching valve, the flow meter and the fan motor switch of each closed cooling tower.

And each matched water inlet branch pipeline and water outlet branch pipeline are also provided with maintenance valves for isolating the corresponding closed cooling tower from the corresponding switching valves of the closed cooling tower.

The closed cooling tower group comprises three closed cooling towers connected in parallel.

And the frequency of a fan motor in the closed cooling tower is controlled by adopting the wet bulb temperature.

The invention also provides application of the cooling tower cooling system based on flow change, which comprises the following steps:

selecting a matched closed cooling tower according to water flow, and completing pipeline selection through a switching valve;

after the water flow is changed, selecting and starting a matched closed cooling tower according to the changed water flow, then closing the closed cooling tower which is running before the water flow is changed, and completing pipeline switching through a switching valve;

the specific method for selecting the matched closed cooling tower according to the water flow is to enable the water flow to be within a tower water flow range corresponding to the selected high energy efficiency interval of the closed cooling tower.

Generally, the closed cooling tower A is 50-100 m³The closed cooling tower B is 100-200 m³The closed cooling tower C is 200-300 m³The/h can meet the requirements of factories.

Furthermore, after the change of the water flow is detected, the pipeline switching is carried out after the time delay judgment. Through time delay processing, the repeated switching of the closed cooling tower caused by flow fluctuation can be avoided, and therefore the stability of the system is ensured.

Generally, the specific time of the delay processing is that the flow detected by the flow meter needs to be kept for about 5 minutes, for example, 4-6 min, and the specific time can be manually set on a computer on a control system.

In the application process, the switch of the related switching valve is matched with a proper closed cooling tower by a PLC (programmable logic controller) according to the flow value measured by the remote flow meter to complete pipeline switching; the PLC can be completed by adopting a common PLC in the technical field of chemical automation.

Compared with the prior art, the invention has the following advantages:

(1) the method adopts a plurality of closed cooling towers with different optimal treatment flows and respectively selects proper closed cooling towers according to different water flows to be treated, thereby ensuring that the operated closed cooling towers all operate in respective optimal energy efficiency intervals, solving the problem that the design load of equipment is not matched with the actual load in the actual operation of the closed cooling towers, reducing the power consumption and having the function of energy conservation;

(2) the number of running devices is reduced, and the service life of the devices is prolonged;

(3) the automatic control method is designed, the defects that manual operation has hysteresis and resource waste is caused by large input of human cost are overcome, the operation is simplified by adopting an automatic operation mode, manpower and material resources are saved, and the control quality of the system is improved.

Drawings

FIG. 1 is a schematic structural view of the present invention;

in the figure, 1 is a water inlet pipeline, 11 is a water inlet main pipeline, 12 is a water inlet branch pipeline, 13 is a water pump, 2 is a water outlet pipeline, 21 is a water outlet main pipeline, 22 is a water outlet branch pipeline, 3 is a closed cooling tower, 4 is a switching valve, 5 is an overhaul valve, and 6 is a flow meter.

Detailed Description

The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications can be made by persons skilled in the art without departing from the spirit of the invention. All falling within the scope of the present invention.