Heat exchange circulating water system

Abstract

The utility model relates to the technical field of heat exchange in the chemical industry, in particular to a heat exchange circulating water system. The system comprises a circulating main pipeline and a plurality of circulating branch pipelines, and mainly comprises a circulating liquid source, an exhaust valve, an energy storage pressure tank, a circulating water master pump, a spraying type cooling tower, a heat pipe type air radiator and load equipment. The system adopts desalted water or an ethylene glycol solution as circulating liquid, and the water temperature is reduced in a mode of combining a heat pipe type air radiator and a spray type cooling tower. The load equipment can be configured with thermal load, cold load or power generation equipment according to requirements. The system is further provided with a flow meter and a pressure gauge for monitoring key parameters so as to improve the cooling efficiency, reduce the use of chemical agents, reduce the waste of water resources and realize energy conservation and emission reduction.

Description

Technical Field

[0001] This utility model relates to the field of heat exchange technology in the chemical industry, and specifically to a heat exchange circulating water system. Background Technology

[0002] In current industrial production, particularly in industries such as oil refining, chemicals, advanced materials processing, and power plants, circulating water systems are widely used. These enterprises generally employ a traditional circulating water treatment method, the core of which involves adding various scale inhibitors, bactericides, and other chemical agents to the water to maintain water quality stability and prevent microbial growth. Subsequently, through the pressurization of pumps, the treated circulating water is transported to heat exchange points in various devices to absorb heat before returning to open cooling towers for evaporative cooling.

[0003] Although this traditional solution did demonstrate good cooling performance in the early stages, ensuring the normal operation of production equipment and stable control of process temperature, its inherent drawbacks gradually became apparent over time, posing significant challenges to the company's production and operations.

[0004] First, scale buildup in heat exchangers is a significant problem. Because circulating water contains various minerals and impurities, these substances easily deposit on the surface of the heat exchanger during prolonged use, forming a difficult-to-remove scale layer. Scale accumulation not only reduces the heat transfer efficiency of the heat exchanger and increases energy consumption, but can also corrode the equipment and shorten its lifespan.

[0005] Secondly, the dosage of chemicals used is large and difficult to control. To maintain stable water quality in circulating water systems, companies have to add large quantities of chemical agents such as scale inhibitors and bactericides. However, the dosage of these agents is often difficult to control precisely; excessive dosage not only increases costs but may also pollute the environment. Furthermore, the frequent replacement and adjustment of these agents increases the complexity and difficulty of operations.

[0006] In addition, traditional circulating water systems also suffer from the problem of excessively rapid increases in the concentration ratio of circulating water. As water evaporates and impurities concentrate, the concentration of circulating water gradually increases, leading to water quality deterioration and further exacerbating the risk of scaling and corrosion in heat exchangers.

[0007] Furthermore, the large amount of water lost through ineffective evaporation is a major drawback of traditional circulating water systems. In open cooling towers, a significant amount of circulating water is lost into the atmosphere through evaporation, resulting in a serious waste of water resources. For water-scarce regions, this waste undoubtedly exacerbates the already strained water situation.

[0008] In summary, while traditional circulating water systems meet the needs of industrial production to a certain extent, their drawbacks, such as easy scaling of heat exchangers, large amount of chemical consumption, rapid increase in circulating water concentration, high wasted power of circulating water pumps, and large amount of ineffective water evaporation, result in huge consumption of water resources and energy.

[0009] Therefore, it is particularly urgent to seek a more efficient, energy-saving, and environmentally friendly circulating water system solution. Utility Model Content

[0010] To address the problems existing in the background art, this utility model provides a heat exchange circulating water system, which includes a main circulating pipeline and several circulating branch pipelines connected to the main circulating pipeline, wherein the main circulating pipeline is provided with:

[0011] A circulating liquid source is used to provide demineralized water or ethylene glycol solution as the circulating liquid;

[0012] An exhaust valve, located at a high point in the system, is used to remove non-condensable gases from the circulating fluid.

[0013] The energy storage pressure tank is connected to the high point of the circulating water return point and is used to replenish circulating water when the system pressure is insufficient.

[0014] The main circulating water pump, whose inlet is connected to the outlet of the heat pipe air radiator, is used to provide power for the entire circulating water system;

[0015] A spray cooling tower is connected to the outlet of the main circulating water pump and is used to further reduce the water temperature by spraying when the circulating water temperature is high.

[0016] Heat pipe air radiators are installed on the main circulation line to reduce the temperature of circulating water by cooling the air.

[0017] On each circulating branch pipeline, several load devices are installed according to the heat load level, i.e., the return water temperature, to transfer the heat of the circulating water to other media or for power generation.

[0018] In the preferred embodiment, two heat pipe air radiators are provided, and the two heat pipe air radiators are connected in parallel on the main circulation line.

[0019] In a preferred embodiment, the load equipment includes one or more of the following: heat load equipment, cold load equipment, and power generation equipment.

[0020] In a preferred embodiment, the load equipment includes three heat load devices, and three circulation branch lines are connected in parallel on the main circulation line. The three heat load devices are respectively installed in the three circulation branch lines.

[0021] In the preferred embodiment, the three circulating branch lines are equipped with cooling load equipment connected in series with the heat load equipment.

[0022] In the preferred embodiment, power generation equipment connected in series with the heat load equipment is installed in the three circulating branch pipelines.

[0023] In the preferred embodiment, a flow meter for monitoring the flow rate of the circulating water is also installed on the main circulation line.

[0024] In a preferred embodiment, a pressure gauge is installed on the main circulation pipeline at the inlet of the main circulation pump to monitor and display the inlet pressure of the circulating water.

[0025] The beneficial effects achieved by this utility model are as follows:

[0026] First, this invention employs a multi-cooling method combining a heat pipe air radiator and a spray cooling tower. The heat pipe air radiator initially lowers the temperature of the circulating water through air cooling, while the spray cooling tower further reduces the water temperature by spraying when the temperature is high. This combination significantly improves the system's cooling efficiency and ensures stable temperature of the circulating water during circulation. The system uses demineralized water or ethylene glycol solution as the circulating fluid, significantly reducing the content of minerals and impurities in the circulating water, thereby reducing the risk of scale buildup on the heat exchanger surface. This not only improves the heat transfer efficiency of the heat exchanger and reduces energy consumption but also extends the equipment's lifespan and reduces maintenance costs. Compared to traditional circulating water systems, this patent reduces the amount of scale inhibitors, bactericides, and other chemical agents used, lowering the cost of these agents and reducing potential environmental pollution. Furthermore, by optimizing the cooling method and reducing ineffective evaporation, this patent also significantly reduces water waste, achieving the goals of energy conservation and emission reduction.

[0027] Secondly, the system is equipped with an air vent valve to remove non-condensable gases from the circulating fluid, ensuring the stable operation of the circulating water system. Simultaneously, the presence of a pressure storage tank allows for timely replenishment of circulating water when system pressure is insufficient, preventing equipment damage and downtime caused by pressure fluctuations and improving the system's reliability and stability.

[0028] Third, the load equipment of this utility model can be equipped with various types such as heat load equipment, cold load equipment, and power generation equipment, and can be flexibly configured according to actual needs. This design enables the circulating water system to transfer and utilize energy according to different operating conditions and needs, thereby improving energy utilization efficiency. For example, when there is waste heat, the heat can be transferred to other media through the heat load equipment, or the heat can be converted into electrical energy for utilization through the power generation equipment. At the same time, the system is equipped with monitoring devices such as flow meters and pressure gauges on the main circulation line, which can monitor key parameters such as the flow rate and pressure of the circulating water in real time. Attached Figure Description

[0029] Figure 1This is a schematic diagram of the overall structure of this utility model.

[0030] Numbering on the map:

[0031] 1. Exhaust valve; 2. Energy storage pressure tank; 3. Load equipment; 4. Circulating liquid source; 5. Heat load equipment; 6. Power generation equipment; 7. Cooling load; 8. Heat pipe air radiator; 10. Circulating water main pump; 11. Pressure gauge; 12. Spray cooling tower; 13. Flow meter. Detailed Implementation

[0032] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. In addition, the forms of the various structures described in the following embodiments are merely illustrative. This utility model is not limited to the structures described in the following embodiments. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0033] Reference Figure 1 A heat exchange circulating water system comprises a main circulating pipeline, wherein the main circulating pipeline is equipped with:

[0034] The circulating liquid source 4, located at the beginning of the system, provides demineralized water or ethylene glycol solution as the circulating liquid and is directly connected to the main circulating pipeline through a pipe.

[0035] Exhaust valve 1 is located at a high point in the system and is connected to the main circulation pipeline via a pipe. It is used to remove non-condensable gases from the circulating liquid.

[0036] Heat pipe air radiator 8 is installed on the main circulation line. Specifically, it can be designed as two parallel heat pipe air radiators to reduce the temperature of the circulating water through air cooling.

[0037] Circulating water flows into the heat pipe air radiator from the main circulation line, and continues to flow along the main line after being cooled.

[0038] The circulating water main pump 10 has its inlet connected to the outlet of the heat pipe air radiator. It provides power to the entire circulating water system through pumping action, driving the flow of circulating fluid.

[0039] The spray cooling tower 12 is connected to the outlet of the circulating water main pump. When the circulating water temperature is high, the water temperature is further reduced by spray cooling.

[0040] The energy storage pressure tank 2 is connected to the high point of the circulating water return and is connected to the system through a pipeline. It is used to replenish the circulating water when the system pressure is insufficient.

[0041] Several circulating branch lines branch off from the main circulating line, and load equipment is installed according to the heat load level.

[0042] Load equipment 3 includes one or more of the following: heat load equipment 5, cold load equipment 7, and power generation equipment 6, connected in series or in parallel to the circulating branch line.

[0043] Flow meter 13 is installed on the main circulation line to monitor the flow rate of circulating water and ensure stable system flow.

[0044] Pressure gauge 11 is installed on the main circulation pipeline at the inlet of the main circulation pump to monitor and display the inlet pressure of the circulating water, ensuring that the system pressure is within the normal range.

[0045] Circulating liquid source 4 supplies circulating liquid to the main circulating pipeline. Exhaust valve 1 is connected to the highest point of the system to remove non-condensable gases. Heat pipe air radiator 8 is connected in parallel to the main circulating pipeline to lower the circulating water temperature. The inlet of the main circulating water pump 10 is connected to the outlet of the heat pipe air radiator, and the outlet is connected to the spray cooling tower 12. Energy storage pressure tank 2 is connected to the highest point of the circulating water return to replenish the circulating water. Circulating branch pipelines branch off from the main pipeline, and load equipment 3 is installed according to the heat load, including heat load equipment 5, cooling load equipment 7, and power generation equipment 6. Flow meter 13 and pressure gauge 11 are used to monitor the circulating water flow rate and pressure, respectively. Depending on the system conditions, demineralized water or a suitable proportion of ethylene glycol solution is used as the circulating liquid. An exhaust valve is installed at the highest point of the system, and an energy storage pressure tank is installed at the highest point of the circulating water return.

[0046] Example 1: In this example, the system is designed with three circulating branch lines, each equipped with a heat load device, which is further connected in series with a cooling load device or a power generation device. Two parallel heat pipe air radiators 8 are installed on the main circulating line to reduce the circulating water temperature through air cooling.

[0047] When the water temperature meets the requirements, only one heat pipe air radiator 8 can be used. When the water temperature is too high, the valves of the heat pipe air radiators 8 can be opened simultaneously to use the heat pipe air radiators 8. The outlet of the heat pipe air radiator 8 serves as the inlet of the circulating water main pump 10. A pressure gauge 11 is installed at the inlet. When the inlet pressure is too low and does not meet the usage requirements, the valve of the energy storage pressure tank 2 is opened to ensure that the required circulating water pressure is reached. The outlet of the circulating water main pump 10 is the spray cooling tower 12. If the water temperature is still too high after passing through the heat pipe air radiator 8, it can be cooled again through the spray cooling tower 12. After cooling, the circulation system is restarted for heat exchange. A flow meter 13 is installed on the circulating water pipeline. When the flow meter 13 detects that the flow rate in the pipeline is insufficient or the circulating water flow rate is too high, it will immediately interlock the signal to the circulating water main pump 10 to adjust the speed in time so that it can meet the normal operating flow requirements. The entire circulation process not only reduces the ineffective evaporation of water, but also greatly extends the service life of the heat exchanger and provides good cooling effect.

[0048] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A heat exchange circulating water system, characterized in that: It includes a main circulation pipeline and several branch circulation pipelines connected to the main circulation pipeline, wherein the main circulation pipeline is equipped with: A circulating liquid source is used to provide demineralized water or ethylene glycol solution as the circulating liquid; An exhaust valve, located at a high point in the system, is used to remove non-condensable gases from the circulating fluid. The energy storage pressure tank is connected to the high point of the circulating water return point and is used to replenish circulating water when the system pressure is insufficient. The main circulating water pump, whose inlet is connected to the outlet of the heat pipe air radiator, is used to provide power for the entire circulating water system; A spray cooling tower is connected to the outlet of the main circulating water pump and is used to further reduce the water temperature by spraying when the circulating water temperature is high. Heat pipe air radiators are installed on the main circulation line to reduce the temperature of circulating water by cooling it with air. On each circulating branch pipeline, several load devices are installed according to the heat load level, i.e., the return water temperature, to transfer the heat of the circulating water to other media or for power generation.

2. The heat exchange circulating water system according to claim 1, characterized in that, There are two heat pipe air radiators, which are connected in parallel on the main circulation line.

3. The heat exchange circulating water system according to claim 1, characterized in that: Load equipment includes one or more of the following: heat load equipment, cold load equipment, and power generation equipment.

4. The heat exchange circulating water system according to claim 3, characterized in that: The load equipment includes three heat load devices, and three circulation branch lines are connected in parallel on the main circulation line. The three heat load devices are respectively installed in the three circulation branch lines.

5. The heat exchange circulating water system according to claim 4, characterized in that: The three circulating branch lines are equipped with cooling load equipment connected in series with the heat load equipment.

6. The heat exchange circulating water system according to claim 4, characterized in that: Power generation equipment connected in series with the heat load equipment is installed in the three circulating branch pipelines.

7. The heat exchange circulating water system according to claim 1, characterized in that: The main circulation line is also equipped with a flow meter for monitoring the flow rate of the circulating water.

8. The heat exchange circulating water system according to claim 1, characterized in that, A pressure gauge is installed on the main circulation pipeline at the inlet of the main circulation pump to monitor and display the inlet pressure of the circulating water.

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