Cooling recovery device and air cooling system

Abstract

The utility model relates to a cooling recovery device and an air cooling system.The cooling recovery device comprises a separation mechanism, and the separation mechanism is arranged on a pipeline connecting a reverse flow area of an air cooling island and a vacuum pump; the separation mechanism can cool the high-temperature steam-water mixture and the non-condensed gas in the countercurrent area and separate the high-temperature steam-water mixture and the non-condensed gas into low-temperature water and gas, and the low-temperature gas enters the vacuum pump; and the water tank is respectively communicated with the separation mechanism and the hot well so as to recover the separated water and supply the water to the hot well. The separation mechanism separates and cools the high-temperature steam-water mixture and the non-condensable gas into low-temperature water and gas, and the volume and temperature of the gas are reduced at the moment, so that the volume flow of extracted steam entering the vacuum pump is reduced, the working current of the vacuum pump is reduced, and the energy consumption is reduced. Meanwhile, water with lower temperature can enter the water tank, and the water tank is communicated with the hot well, so that the water can be recycled by the hot well, and resource conservation and use are facilitated.

Description

Technical Field

[0001] This disclosure relates to the field of air-cooled island technology, and more specifically, to a cooling recovery device and an air-cooling system. Background Technology

[0002] An air-cooled island is a descriptive term for an air-cooling device in a power plant. Its working principle primarily utilizes ambient air as a cooling medium to condense process fluids. During operation, the counter-current zone of the air-cooled island generates non-condensable gases and a mixture of steam and water. Technicians connect the counter-current zone and the vacuum pump through pipelines to discharge these gases and the mixture into the atmosphere, ensuring the stability of the air-cooled island's operation. However, because the temperature of the steam-water mixture and non-condensable gases is relatively high at the inlet of the vacuum pump, the pump's suction capacity is large, resulting in high power consumption. Utility Model Content

[0003] The purpose of this disclosure is to provide a cooling recovery device and an air-cooling system to at least partially solve the problems existing in the related art.

[0004] To achieve the above objectives, this disclosure provides a cooling recovery apparatus, comprising:

[0005] A separation mechanism is installed on the pipeline connecting the counter-current zone of the air-cooled island and the vacuum pump. Under the action of the vacuum pump, the separation mechanism can cool down and separate the higher-temperature steam-water mixture and non-condensable gas in the counter-current zone into lower-temperature water and gas. The lower-temperature gas enters the vacuum pump.

[0006] A water tank is connected to both the separation mechanism and the hot well to recover the separated water and supply it to the hot well.

[0007] Optionally, the separation mechanism includes a first separator and a second separator connected in series. The first separator is connected to the countercurrent zone, and the second separator is connected to the inlet of the vacuum pump. Both the first separator and the second separator are connected to the water tank to recover the water after the two separations into the water tank.

[0008] Optionally, the first separator is provided with a water inlet and a first air outlet at the top, and a first air inlet and a first water outlet at the bottom. Cooling water enters the first separator from top to bottom through the water inlet. The higher temperature steam-water mixture and non-condensable gas in the countercurrent zone enter the first separator from bottom to top through the first air inlet and exchange heat. The first air outlet is connected to the second separator, and the first water outlet is connected to the water tank.

[0009] Optionally, the second separator has a second air inlet connected to the first air outlet, a second air outlet connected to the vacuum pump, and a second water outlet connected to the water tank. The steam-water mixture and non-condensable gas entering the second separator from bottom to top in a spiral pattern, the separated gas enters the vacuum pump through the second air outlet, and the separated water enters the water tank through the second water outlet.

[0010] Optionally, there may be multiple first separators, and these first separators may be connected in series, with the first first separator connected to the countercurrent zone and the last first separator connected to the second separator; and / or,

[0011] There are multiple second separators, and the multiple second separators are connected in series, with the first one connected to the first separator and the last one connected to the vacuum pump;

[0012] Multiple first separators and multiple second separators are all connected to the water tank.

[0013] Optionally, a solenoid valve is installed on the pipeline connecting the first separator and the water tank.

[0014] Optionally, a water pump is installed on the pipeline connecting the water tank and the hot well, and a level gauge is installed inside the water tank.

[0015] According to a second aspect of the present disclosure, an air-cooling system is provided, including an air-cooling island, a vacuum pump, and a cooling recovery device as described in any of the above embodiments, wherein the separation mechanism is disposed on a pipeline connecting the air-cooling island and the vacuum pump.

[0016] Optionally, the air-cooling system further includes a vapor-water separator, which is connected to the outlet of the vacuum pump and is used to separate the gas discharged by the vacuum pump.

[0017] Optionally, the vacuum pump is a water ring vacuum pump, and a heating element is installed between the water outlet of the steam-water separator and the water inlet of the vacuum pump. The water discharged from the steam-water separator passes through the heating element to power the vacuum pump.

[0018] The technical solutions provided by the embodiments of this disclosure may include the following beneficial effects:

[0019] Under the suction of the vacuum pump, the higher-temperature steam-water mixture and non-condensable gas in the countercurrent zone enter the separation mechanism. The separation mechanism separates and cools the higher-temperature steam-water mixture and non-condensable gas into lower-temperature water and gas. At this time, the volume and temperature of the gas decrease, resulting in a reduction in the volumetric flow rate of the steam entering the vacuum pump, which lowers the operating current of the vacuum pump and saves energy. At the same time, the lower-temperature water can enter the water tank, which is connected to the heat well, allowing the water to be recycled by the heat well, which is beneficial for the conservation of resources.

[0020] Other features and advantages of this disclosure will be described in detail in the following detailed description section. Attached Figure Description

[0021] The accompanying drawings are provided to further illustrate the present disclosure and form part of the specification. They are used together with the following detailed description to explain the present disclosure, but do not constitute a limitation thereof. In the drawings:

[0022] Figure 1 This is a schematic diagram of an air-cooled system according to an exemplary embodiment of the present disclosure.

[0023] Figure 2 This is a schematic diagram of a cooling recovery apparatus according to an exemplary embodiment of the present disclosure.

[0024] Explanation of reference numerals in the attached figures

[0025] 10. Air-cooled island; 11. Counterflow zone; 20. Vacuum pump; 30. Steam-water separator; 40. Heating element; 100. Separation mechanism; 110. First separator; 111. First water outlet; 112. Water inlet; 113. First air outlet; 114. First air inlet; 120. Second separator; 200. Water tank; 300. Water inlet pipe; 410. Regulating valve; 420. Solenoid valve; 430. Water pump; 440. Level gauge. Detailed Implementation

[0026] The specific embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this disclosure.

[0027] In this disclosure, unless otherwise stated, directional terms such as "upper," "lower," "top," and "bottom" are used for ease of description based on the drawing orientation of the corresponding figures, while "inner" and "outer" are defined based on the contour of the corresponding component itself. Terms such as "first" and "second" used in this disclosure are used to distinguish one element from another and do not have sequential or importance implications. Furthermore, when the following description refers to the figures, unless otherwise indicated, the same numbers in different figures represent the same or similar elements.

[0028] Please see Figure 1 and Figure 2 This disclosure provides a cooling recovery device, including a separation mechanism 100 and a water tank 200. The separation mechanism 100 can be installed on a pipeline connecting the counter-current zone 11 of the air-cooled island 10 and the vacuum pump 20. Under the action of the vacuum pump 20, the separation mechanism 100 can cool and separate the higher-temperature steam-water mixture and non-condensable gas in the counter-current zone 11 into lower-temperature water and gas. The lower-temperature gas enters the vacuum pump 20. The water tank 200 can be connected to both the separation mechanism 100 and a heat well (not shown in the figure) to recover water and supply it to the heat well. This water can be recycled as condensate, preventing water overflow due to excessive water content in the vacuum pump 20.

[0029] Understandably, the higher-temperature steam-water mixture in the counter-current zone 11 enters the separation mechanism 100 under the suction of the vacuum pump 20. The separation mechanism 100 cools the higher-temperature steam-water mixture into water and cools the non-condensable gas into a lower-temperature gas. The volume of this gas is relatively smaller than that of the higher-temperature non-condensable gas, thus reducing the pumping volume and flow rate at the inlet of the vacuum pump 20 and ensuring lower power consumption of the vacuum pump 20. Simultaneously, the separated water can enter the water tank 200, which is connected to the heat well, allowing the water to be recycled and reused by the heat well. This promotes resource conservation and improves the unit's economic efficiency.

[0030] In one embodiment, the separation mechanism 100 includes a first separator 110 and a second separator 120 connected in series. The first separator 110 is connected to the countercurrent zone 11, and the second separator 120 is connected to the inlet of the vacuum pump 20. Both the first separator 110 and the second separator 120 are connected to the water tank 200 to recover the water after the two separations into the water tank 200.

[0031] Understandably, the first separator 110 can be a tubular heat exchanger or a plate heat exchanger, etc. Under the suction of the vacuum pump 20, the higher-temperature steam-water mixture and non-condensable gas enter the first separator 110. After cooling, the higher-temperature steam-water mixture becomes a lower-temperature steam-water mixture and water, with the water entering the water tank 200. The higher-temperature non-condensable gas can be cooled in the first separator 110 to become a lower-temperature non-condensable gas. The lower-temperature steam-water mixture and non-condensable gas enter the second separator 120, where the lower-temperature steam-water mixture is cooled to become water, which enters the water tank 200. The lower-temperature non-condensable gas is cooled in the second separator 120 before entering the vacuum pump 20. Because the volume and temperature of the non-condensable gas decrease after two cooling cycles, and the gas-water mixture turns into water and enters the water tank 200, the volumetric flow rate of the gas entering the inlet of the vacuum pump 20 is reduced. This lowers the operating current of the vacuum pump 20, saving energy. It also improves the vacuum level of the unit, reduces the current of the vacuum pump 20 motor, and extends the service life of the vacuum pump 20.

[0032] In one embodiment, the top of the first separator 110 is provided with a water inlet 112 and a first air outlet 113, and the bottom of the first separator 110 is provided with a first air inlet 114 and a first water outlet 111. Cooling water enters the first separator 110 from top to bottom through the water inlet 112. The higher temperature steam-water mixture and non-condensable gas in the counterflow zone 11 enter the first separator 110 from bottom to top through the first air inlet 114 and exchange heat. The first air outlet 113 is connected to the second separator 120, and the first water outlet 111 is connected to the water tank 200.

[0033] Understandably, cooling water is used to cool down the higher-temperature steam-water mixture and non-condensable gas in the first separator 110. The cooling water and the higher-temperature steam-water mixture and non-condensable gas move towards each other in the first separator 110 to ensure that the cooling water can fully exchange heat with the higher-temperature steam-water mixture and non-condensable gas, thus ensuring the cooling effect of the steam-water mixture and non-condensable gas.

[0034] For example, in the first separator 110, cooling water at about 25°C is used to cool the gas-water mixture and non-condensable gas at about 75°C. After cooling, the temperature of the mixed gas can be reduced to about 20°C.

[0035] In one embodiment, the second separator 120 has a second air inlet connected to the first air outlet 113, a second air outlet connected to the vacuum pump 20, and a second water outlet connected to the water tank 200. The steam-water mixture and non-condensable gas entering the second separator 120 in a spiral manner from bottom to top, the separated gas enters the vacuum pump 20 through the second air outlet, and the separated water enters the water tank 200 through the second water outlet.

[0036] The second separator 120 can be a baffle separator or a rotary separator, for example, a rotary separator. The lower temperature gas-water mixture spirals up and cools down to become water in the second separator 120. The lower temperature non-condensable gas spirals up and cools down in the second separator 120 and then enters the inlet of the vacuum pump 20. After cooling down, the volume and temperature of the gas will decrease, reducing the operating current of the vacuum pump 20.

[0037] In one embodiment, there are multiple first separators 110 connected in series. The first first separator 110 is connected to the countercurrent zone 11, and the last first separator 110 is connected to the second separator 120. Alternatively, there are multiple second separators 120 connected in series, with the first one connected to the first separator 110 and the last one connected to the vacuum pump 20. Both the multiple first separators 110 and the multiple second separators 120 are connected to the water tank 200. The multiple first separators 110 and multiple second separators 120 enhance the cooling effect and separation efficiency of the high-temperature steam-water mixture and non-condensable gases. The water separated multiple times is recycled back into the water tank 200.

[0038] In one embodiment, cooling water can be connected to inlet 112 via inlet pipe 300. A regulating valve 410 is installed on inlet pipe 300 to regulate the flow rate of cooling water within the inlet pipe 300. The cooling effect of the steam-water mixture and non-condensable gases is adjusted by regulating the inlet water flow rate. The control method is convenient and easy to implement.

[0039] The cooling recovery device also includes automatic control components such as a touch screen and PLC, which can control the temperature of the mixed gas, the flow rate of cooling water, and the water level in the water tank 200, keeping the temperature of the mixed gas within the optimal economic and reasonable range.

[0040] In one embodiment, a solenoid valve 420 is installed on the pipeline connecting the first separator 110 and the water tank 200. The solenoid valve 420 can be used to control the water flow rate. Of course, in other embodiments, a manual valve can be installed on the pipeline to control the water output.

[0041] Understandably, when the water in the water tank 200 reaches the upper limit, the solenoid valve 420 closes, and the water separated by the separator is temporarily stored in the separator; when the water in the water tank 200 is discharged to the lower limit, the solenoid valve 420 is opened, allowing the water in the separator to flow into the water tank 200.

[0042] In one embodiment, a water pump 430 may be installed on the pipeline connecting the water tank 200 and the hot well, and a level gauge 440 may be installed in the water tank 200. The information obtained by the level gauge 440 is used to control the start or stop of the water pump 430.

[0043] Understandably, when the level indicator detects that the water level in the water tank 200 is high, the level gauge 440 can send a signal to the water pump 430 to start the water pump 430 to discharge the water in the water tank 200 into the hot well; when the level gauge 440 detects that the water level in the water tank 200 is low or there is no water, the level gauge 440 can send a signal to the water pump 430 to shut down the water pump 430.

[0044] In one embodiment, the separation mechanism 100 may include an electrostatic demister and a fan. The two ends of the electrostatic demister may be connected to the air-cooled island 10 and the vacuum pump 20, respectively, and can be used to adsorb moisture in the steam-water mixture. The fan may be installed on the pipeline to reduce the temperature of the pipeline.

[0045] Understandably, the moisture in the soda mixture can be adsorbed by the electrostatic demister, and the fan blows air through the duct to lower the gas temperature, thus avoiding a large pumping volume from the vacuum pump 20 due to high gas temperature and ensuring low power consumption of the vacuum pump 20.

[0046] According to a second aspect of the present disclosure, an air-cooling system is provided, which may include an air-cooling island 10, a vacuum pump 20, and a cooling recovery device according to any of the above embodiments, wherein a separation mechanism 100 is disposed on a pipeline connecting the air-cooling island 10 and the vacuum pump 20. The air-cooling system may have all the beneficial effects of the cooling recovery device described above, which will not be elaborated further here.

[0047] In one embodiment, the air-cooling system may further include a vapor-water separator 30, which can be connected to the outlet of the vacuum pump 20 and can be used to separate the gas discharged by the vacuum pump 20, thereby realizing the recovery of moisture in the gas and facilitating the conservation and utilization of water.

[0048] In one embodiment, the vacuum pump 20 can be a water ring vacuum pump 20. A heating element 40 can be installed between the water outlet of the steam-water separator 30 and the water inlet of the vacuum pump 20. The water discharged from the steam-water separator 30 can be used to power the vacuum pump 20 through the heating element 40, so that the water is fully utilized and resources are saved.

[0049] The preferred embodiments of this disclosure have been described in detail above with reference to the accompanying drawings. However, this disclosure is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this disclosure, various simple modifications can be made to the technical solutions of this disclosure, and these simple modifications all fall within the protection scope of this disclosure.

[0050] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, this disclosure will not describe the various possible combinations separately.

[0051] Furthermore, various different embodiments of this disclosure can be combined in any way, as long as they do not violate the spirit of this disclosure, they should also be regarded as the content disclosed in this disclosure.

Claims

1. A cooling recovery device, characterized in that, include: A separation mechanism is installed on the pipeline connecting the counter-current zone of the air-cooled island and the vacuum pump. Under the action of the vacuum pump, the separation mechanism can cool down and separate the higher-temperature steam-water mixture and non-condensable gas in the counter-current zone into lower-temperature water and gas. The lower-temperature gas enters the vacuum pump. A water tank is connected to both the separation mechanism and the hot well to recover the separated water and supply it to the hot well. The separation mechanism includes a first separator and a second separator connected in series. The first separator is connected to the countercurrent zone, and the second separator is connected to the inlet of the vacuum pump. Both the first separator and the second separator are connected to the water tank to recover the water after the two separations into the water tank.

2. The cooling recovery device according to claim 1, characterized in that, The first separator has a water inlet and a first air outlet at the top, and a first air inlet and a first water outlet at the bottom. Cooling water enters the first separator from top to bottom through the water inlet. The higher temperature steam-water mixture and non-condensable gas in the counter-current zone enter the first separator from bottom to top through the first air inlet and exchange heat. The first air outlet is connected to the second separator, and the first water outlet is connected to the water tank.

3. The cooling recovery device according to claim 2, characterized in that, The second separator has a second air inlet connected to the first air outlet, a second air outlet connected to the vacuum pump, and a second water outlet connected to the water tank. The steam-water mixture and non-condensable gas entering the second separator from bottom to top in a spiral pattern, the separated gas enters the vacuum pump through the second air outlet, and the separated water enters the water tank through the second water outlet.

4. The cooling recovery device according to claim 2, characterized in that, The number of first separators is multiple, and the multiple first separators are connected in series, with the first first separator connected to the countercurrent zone and the last first separator connected to the second separator; and / or, There are multiple second separators, and the multiple second separators are connected in series, with the first one connected to the first separator and the last one connected to the vacuum pump; Multiple first separators and multiple second separators are all connected to the water tank.

5. The cooling recovery device according to claim 1, characterized in that, A solenoid valve is installed on the pipeline connecting the first separator and the water tank.

6. The cooling recovery device according to claim 1, characterized in that, A water pump is installed on the pipeline connecting the water tank and the hot well, and a level gauge is installed inside the water tank.

7. An air-cooled system, characterized in that, It includes an air-cooled island, a vacuum pump, and a cooling recovery device according to any one of claims 1-6, wherein the separation mechanism is disposed on the pipeline connecting the air-cooled island and the vacuum pump.

8. The air-cooled system according to claim 7, characterized in that, The air-cooling system also includes a vapor-water separator, which is connected to the outlet of the vacuum pump and is used to separate the gas discharged by the vacuum pump.

9. The air-cooled system according to claim 8, characterized in that, The vacuum pump is a water ring vacuum pump. A heating element is installed between the water outlet of the steam-water separator and the water inlet of the vacuum pump. The water discharged from the steam-water separator powers the vacuum pump after passing through the heating element.

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