Device for heating reverse osmosis inlet water by utilizing industrial circulating water waste heat

Abstract

The utility model belongs to the technical field of industrial circulating water waste heat recycling, and particularly relates to a device for heating reverse osmosis inlet water by utilizing industrial circulating water waste heat. Comprising a circulating water return pipeline and a reverse osmosis water supply pipeline, the reverse osmosis water supply pipeline is sequentially connected with a heat exchanger, a booster pump and a reverse osmosis device, the circulating water return pipeline is connected with a water cooling tower, the circulating water return pipeline is connected with a first pipeline and a second pipeline in parallel, the first pipeline is sequentially connected with the heat exchanger and the water cooling tower, and the second pipeline is communicated with an electric heating pump. The electric heat pump is communicated with the first pipeline through a second pipeline, and a third pipeline is connected in parallel to the reverse osmosis water supply pipeline between the heat exchanger and the booster pump. According to the utility model, the temperature of the reverse osmosis raw water can be raised through the waste heat of industrial circulating water, so that the water inlet requirement of reverse osmosis is ensured, the problems of unstable operation of the reverse osmosis device and damage to a membrane component caused by low temperature of the raw water in winter are prevented, the energy consumption cost for raising the temperature of the reverse osmosis raw water can be greatly reduced, and the energy is saved.

Description

Technical Field

[0001] The utility model belongs to the technical field of industrial circulating water waste heat reuse, and in particular relates to a device that utilizes industrial circulating water waste heat to heat reverse osmosis inlet water. Background Art

[0002] In recent years, reverse osmosis devices, as an advanced means of deep water treatment, have been widely used in industrial production such as sewage purification, pure water preparation, and concentration. The inlet water temperature of the reverse osmosis device is usually controlled between 20-45°C. Too high a temperature will cause the reverse osmosis membrane material to soften or deform, thereby affecting the life and performance of the membrane, and will also accelerate the rate at which salt passes through the membrane, resulting in a decrease in the desalination rate; too low a temperature will reduce the permeability of the membrane and reduce the water production rate. In severe cases, it will cause the membrane to be blocked and reduce the service life of the membrane. In winter, in northern my country, due to the low ambient temperature, the inlet water temperature of the reverse osmosis device will drop below 10°C, seriously affecting the stable operation of the reverse osmosis device. In severe cases, it will lead to insufficient supply of production water and affect production. Therefore, the inlet water of the reverse osmosis device needs to be heated in winter.

[0003] To this end, people add a steam heater or directly pass steam into the raw water tank of the reverse osmosis device to heat the raw water by steam heating. After the raw water is heated to about 25°C, it is sent to the subsequent membrane treatment device for treatment. This method consumes a lot of steam and has huge operating costs. 3 / h reverse osmosis device as an example, using steam to heat 10 ℃ raw water to 25 ℃, the required saturated steam volume with a gauge pressure of 0.6Mpa is about 9.08t / h (400m 3 / h*1t / m 3 *4183KJ / (t.℃)*15℃ / 2762.83KJ / kg / 1000), the steam price is 120 yuan / t, it runs for 3 months a year, and the annual operating cost is about 2.3535 million yuan. The operating cost is huge, and the steam supply cannot be guaranteed for enterprises with insufficient steam. Moreover, the use of steam for heating increases investment costs for long-distance transportation, especially in places around the reverse osmosis device where there is a lack of steam, which makes it inconvenient to use steam for heating.

[0004] Another way is to add an electric heater to heat the raw water, and send it to the subsequent membrane treatment device after the raw water is heated to about 25°C. This method consumes a lot of electricity and has high operating costs, which is not economical. 3 / h reverse osmosis device as an example, using steam to heat 10 ℃ raw water to 25 ℃, the required power is about 6972KW (400m 3 / h*1t / m 3*4183KJ / (t.℃)*15℃ / 3600s), the electricity price is calculated at 0.5 yuan / t, it runs for 3 months a year, and the annual operating cost is about 7.5298 million yuan, which is huge.

[0005] Industrial circulating water is mainly used in the cooling water system of the factory, so it is also called circulating cooling water. The temperature of the industrial circulating water after circulation is high, and it needs to be sent back to the cooling tower for cooling. The waste heat carried by it is dissipated into the atmosphere through the cooling tower to achieve the purpose of cooling. In this way, the heat of the industrial circulating water is wasted. Summary of the invention

[0006] The utility model aims to provide a device for heating reverse osmosis inlet water by utilizing waste heat of industrial circulating water, so as to solve the problems existing in the prior art.

[0007] The technical solution adopted by the utility model to solve its technical problems is: a device for heating reverse osmosis inlet water by utilizing industrial circulating water waste heat, comprising a circulating water return pipeline and a reverse osmosis water supply pipeline, wherein the reverse osmosis water supply pipeline is sequentially connected with a heat exchanger, a booster pump, and a reverse osmosis device, the circulating water return pipeline is connected with a cooling tower, a first pipeline and a second pipeline are connected in parallel on the circulating water return pipeline, the first pipeline is sequentially connected with the heat exchanger and the cooling tower, the second pipeline is connected with an electric heat pump, the electric heat pump is connected with the first pipeline through the second pipeline, a third pipeline is connected in parallel on the reverse osmosis water supply pipeline between the heat exchanger and the booster pump, and the third pipeline is connected with the electric heat pump.

[0008] Furthermore, the reverse osmosis water supply pipeline is a pipeline with a thermal insulation layer to reduce heat loss.

[0009] Furthermore, the heat exchanger is a shell and tube heat exchanger or a spiral plate heat exchanger to reduce the operating resistance of the heat exchanger.

[0010] Furthermore, the end of the circulating water return pipeline is connected to the spray water inlet of the cooling tower, the reverse osmosis water supply pipeline is connected to the cold side of the heat exchanger, the first pipeline is connected to the hot side of the heat exchanger and the end of the first pipeline is connected to the bottom water tank of the cooling tower, the second pipeline is connected to the hot side of the electric heat pump, and the third pipeline is connected to the cold side of the electric heat pump.

[0011] Furthermore, a first thermometer and a second thermometer are respectively installed on the reverse osmosis water supply pipelines at the water inlet of the reverse osmosis device and the cold side water outlet of the heat exchanger, and a third thermometer is installed on the third pipeline at the cold side water outlet of the electric heat pump.

[0012] Furthermore, a cold inlet valve and a cold outlet valve are installed on the second pipelines at the cold side water inlet and the cold side water outlet of the electric heat pump, respectively, and a hot inlet valve and a hot outlet valve are installed on the third pipelines at the hot side water inlet and the water outlet of the electric heat pump, respectively.

[0013] Furthermore, a switching valve is installed on the reverse osmosis water supply pipeline between the heat exchanger and the booster pump, one end of the third pipeline is located on the reverse osmosis water supply pipeline near the heat exchanger end of the switching valve, and the other end of the third pipeline is located on the reverse osmosis water supply pipeline near the booster pump end of the switching valve.

[0014] Furthermore, a spray water inlet valve is installed at one end of the circulating water return pipeline close to the cooling tower.

[0015] The utility model has the following beneficial effects:

[0016] 1. The utility model can heat up the reverse osmosis raw water through the waste heat of industrial circulating water, thereby ensuring the water inlet requirements of the reverse osmosis, preventing the problem of unstable operation of the reverse osmosis device and damage to the membrane components due to the low raw water temperature in winter, and greatly reducing the energy consumption cost of heating the reverse osmosis raw water, saving energy.

[0017] 2. A portion of the circulating water is introduced into the heat exchanger through the first pipeline to heat the raw water, thereby utilizing the waste heat of the circulating water to heat the raw water and achieve the purpose of cooling the circulating water, thereby increasing the temperature of the raw water and ensuring the normal operation of the reverse osmosis device in winter.

[0018] 3. The raw water is heated twice by an electric heat pump, which can ensure that the temperature of the raw water entering the reverse osmosis device meets the requirements when the ambient temperature is low in winter. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of the utility model.

[0020] Among them: 1. Reverse osmosis water supply pipeline; 2. Circulating water return pipeline; 3. Heat exchanger; 4. Booster pump; 5. Reverse osmosis device; 6. Cooling tower; 7. First pipeline; 8. Second pipeline; 9. Third pipeline; 10. Electric heat pump; 11. First thermometer; 12. Second thermometer; 13. Third thermometer; 14. Cold inlet valve; 15. Cold outlet valve; 16. Hot inlet valve; 17. Hot outlet valve; 18. Switching valve; 19. Spray inlet valve. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with specific embodiments and drawings. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0022] like Figure 1As shown, a device for heating reverse osmosis feed water by utilizing waste heat of industrial circulating water comprises a circulating water return pipeline 2 and a reverse osmosis water supply pipeline 1, the reverse osmosis water supply pipeline 1 is sequentially connected with a heat exchanger 3, a booster pump 4, and a reverse osmosis device 5, the circulating water return pipeline 2 is connected with a cooling tower 6, a first pipeline 7 and a second pipeline 8 are connected in parallel to the circulating water return pipeline 2, the first pipeline 7 is sequentially connected with the heat exchanger 3 and the cooling tower 6, the second pipeline 8 is connected with an electric heat pump 10, the electric heat pump 10 is connected with the first pipeline 7 through the second pipeline 8, a third pipeline 9 is connected in parallel to the reverse osmosis water supply pipeline 1 between the heat exchanger 3 and the booster pump 4, and the third pipeline 9 is connected with the electric heat pump 10.

[0023] The reverse osmosis water supply pipeline 1 is a pipeline with a thermal insulation layer to reduce heat loss.

[0024] The heat exchanger 3 is a shell and tube heat exchanger 3 or a spiral plate heat exchanger 3 to reduce the operating resistance of the heat exchanger 3 .

[0025] The end of the circulating water return pipe 2 is connected to the spray water inlet of the cooling tower 6, the reverse osmosis water supply pipe 1 is connected to the cold side of the heat exchanger 3, the first pipe 7 is connected to the hot side of the heat exchanger 3 and the end of the first pipe 7 is connected to the bottom water tank of the cooling tower 6, the second pipe 8 is connected to the hot side of the electric heat pump 10, and the third pipe 9 is connected to the cold side of the electric heat pump 10.

[0026] A first thermometer 11 and a second thermometer 12 are respectively installed on the reverse osmosis water supply pipeline 1 at the water inlet end of the reverse osmosis device 5 and the cold side water outlet end of the heat exchanger 3, and a third thermometer 13 is installed on the third pipeline 9 at the cold side water outlet end of the electric heat pump 10.

[0027] A cold inlet valve 14 and a cold outlet valve 15 are installed on the second pipeline 8 at the cold side water inlet and the cold side water outlet of the electric heat pump 10, respectively. A hot inlet valve 16 and a hot outlet valve 17 are installed on the third pipeline 9 at the hot side water inlet and the water outlet of the electric heat pump 10, respectively.

[0028] A switching valve 18 is installed on the reverse osmosis water supply pipeline 1 between the heat exchanger 3 and the booster pump 4. One end of the third pipeline 9 is located on the reverse osmosis water supply pipeline 1 at the end of the switching valve 18 close to the heat exchanger 3, and the other end of the third pipeline 9 is located on the reverse osmosis water supply pipeline 1 at the end of the switching valve 18 close to the booster pump 4.

[0029] A spray water inlet valve 19 is installed at one end of the circulating water return pipe 2 close to the cooling tower 6.

[0030] The working principle of the utility model is: industrial circulating water enters from the circulating water return pipe 2, a part of it enters the cooling tower 6 for cooling, and the other part enters the heat exchanger 3 as a heat source for heat exchange through the first pipe 7, and enters the water tank at the bottom of the cooling tower 6 after heat exchange, and the spray water inlet valve 19 adjusts the flow rate. The raw water of the reverse osmosis device 5 enters the heat exchanger 3 from the reverse osmosis water supply pipeline 1, and exchanges heat with the industrial circulating water on the hot side of the heat exchanger 3 to increase the temperature. After the heat exchange, the raw water enters the reverse osmosis device 5 through the switching valve 18 and the booster pump 4. The first thermometer 11 is used to detect the temperature of the raw water entering the reverse osmosis device 5 to ensure that the temperature is higher than 20°C. When the first thermometer 11 detects that the temperature is lower than 20°C, the flow rate is adjusted through the spray water inlet valve 19 to increase the industrial circulating water entering the heat exchanger 3 and reduce the industrial circulating water entering the cooling tower 6. The air volume of the fan of the cooling tower 6 is adjusted accordingly to adapt to the amount of industrial circulating water entering the cooling tower 6, thereby ensuring that the raw water temperature is higher than 20°C and reducing the energy consumption of the cooling tower 6.

[0031] The ambient temperature is low in winter, and the circulating water return pipe 2 has a certain distance, so the heat loss is relatively large. Therefore, the temperature at the second thermometer 12 should be higher than the temperature at the first thermometer 11, so as to ensure that the raw water entering the reverse osmosis device 5 is higher than 20°C. Based on this, the second thermometer 12 is set to limit value 1. When the second thermometer 12 detects that the temperature is lower than limit value 1, it means that the temperature of the raw water is lower than 20°C when it is transported to the reverse osmosis device 5. At this time, the opening of the spray inlet valve 19 and the fan air volume of the cooling tower 6 are adjusted to increase the temperature of the raw water at the cold side outlet of the heat exchanger 3.

[0032] When the environment in winter continues to decrease, adjusting the opening of the spray water inlet valve 19 cannot ensure that the temperature at the second thermometer 12 is higher than the limit value 1. At this time, the limit value 2 is set, indicating that when the temperature at the second thermometer 12 is lower than the limit value 2, only using the heat exchanger 3 is not enough to ensure that the temperature of the raw water entering the reverse osmosis device 5 is higher than 20°C. When the second thermometer 12 detects that the temperature is lower than the limit value 2, the switching valve 18 is closed, the cold inlet valve 14, the cold outlet valve 15, the hot inlet valve 16, and the hot outlet valve 17 are opened, and a part of the circulating water enters the electric heat pump 10 and then returns to the second pipeline 8 to enter the bottom of the cooling tower 6. After the raw water flows out of the heat exchanger 3, it first enters the electric heat pump 10, and the heating function of the electric heat pump 10 is used to increase the temperature of the raw water.

[0033] Similarly, the temperature of the raw water coming out of the electric heat pump 10 must be higher than 20°C, so as to ensure that the temperature of the raw water at the inlet of the reverse osmosis device 5 is not lower than 20°C. Here, the limit value 3 is set, indicating that the temperature at the third thermometer 13 must be higher than the limit value 3 to ensure that the temperature at the first thermometer 11 is higher than 20°C. At this time, the operating power of the electric heat pump 10, the opening of the spray water inlet valve 19 and the fan air volume of the cooling tower 6 are adjusted to ensure that the temperature at the third thermometer 13 is higher than the limit value 3, and the operating power consumption of the cooling tower 6 is also reduced.

[0034] It should be noted that the utility model can be automatically controlled by a PLC programmable controller. The control of equipment and valves by the PLC programmable controller and the opening and closing of valves and equipment based on the detection results of the temperature gauge are conventional technologies for automatic control, which will not be repeated here.

[0035] The above-described embodiments are merely descriptions of preferred implementations of the present invention, and are not intended to limit the concept and scope of the present invention. Without departing from the design concept of the present invention, various modifications and improvements made by ordinary persons in the art to the technical solution of the present invention shall fall within the scope of protection of the present invention.

[0036] The technology, shape and structure parts not described in detail in the present invention are all known technologies.

Claims

1. A device for heating reverse osmosis water by utilizing waste heat from industrial circulating water, characterized in that: It includes a circulating water return pipeline and a reverse osmosis water supply pipeline, wherein the reverse osmosis water supply pipeline is sequentially connected to a heat exchanger, a booster pump, and a reverse osmosis device, the circulating water return pipeline is connected to a cooling tower, a first pipeline and a second pipeline are connected in parallel on the circulating water return pipeline, the first pipeline is sequentially connected to the heat exchanger and the cooling tower, the second pipeline is connected to an electric heat pump, the electric heat pump is connected to the first pipeline through the second pipeline, a third pipeline is connected in parallel on the reverse osmosis water supply pipeline between the heat exchanger and the booster pump, and the third pipeline is connected to the electric heat pump.

2. The device for heating reverse osmosis inlet water using industrial circulating water waste heat according to claim 1 is characterized in that: The reverse osmosis water supply pipeline is a pipeline with a thermal insulation layer to reduce heat loss.

3. The device for heating reverse osmosis inlet water using industrial circulating water waste heat according to claim 1 is characterized in that: The heat exchanger is a shell and tube heat exchanger or a spiral plate heat exchanger to reduce the running resistance of the heat exchanger.

4. The device for heating reverse osmosis inlet water using industrial circulating water waste heat according to claim 1 is characterized in that: The end of the circulating water return pipeline is connected to the spray water inlet of the cooling tower, the reverse osmosis water supply pipeline is connected to the cold side of the heat exchanger, the first pipeline is connected to the hot side of the heat exchanger and the end of the first pipeline is connected to the bottom water tank of the cooling tower, the second pipeline is connected to the hot side of the electric heat pump, and the third pipeline is connected to the cold side of the electric heat pump.

5. The device for heating reverse osmosis inlet water using industrial circulating water waste heat according to claim 4 is characterized in that: The first and second thermometers are respectively installed on the reverse osmosis water supply pipelines at the water inlet of the reverse osmosis device and the water outlet of the cold side of the heat exchanger, and the third thermometer is installed on the third pipeline at the water outlet of the cold side of the electric heat pump.

6. The device for heating reverse osmosis inlet water using industrial circulating water waste heat according to claim 4 is characterized in that: A cold inlet valve and a cold outlet valve are installed on the second pipelines of the cold side water inlet and the cold side water outlet of the electric heat pump respectively, and a hot inlet valve and a hot outlet valve are installed on the third pipelines of the hot side water inlet and the hot side water outlet of the electric heat pump respectively.

7. The device for heating reverse osmosis inlet water using industrial circulating water waste heat according to claim 4, characterized in that: A switching valve is installed on the reverse osmosis water supply pipeline between the heat exchanger and the booster pump, one end of the third pipeline is located on the reverse osmosis water supply pipeline near the heat exchanger, and the other end of the third pipeline is located on the reverse osmosis water supply pipeline near the booster pump.

8. The device for heating reverse osmosis inlet water using industrial circulating water waste heat according to claim 4, characterized in that: A spray water inlet valve is installed at one end of the circulating water return pipeline close to the cooling tower.

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