A multi-stage utilization system for steam condensate

Abstract

This utility model discloses a multi-stage steam condensate utilization system, which includes a recovery unit, an opening and closing unit, a primary water-using unit, and a secondary water-using unit. The recovery unit includes a storage tank and a baffle plate. The baffle plate is fixed inside the storage tank to separate a first water storage chamber and a second water storage chamber from bottom to top within the storage tank. The beneficial effects of this utility model are: This multi-stage steam condensate utilization system uses high-quality condensate that might otherwise accumulate or be discharged to replace part of the industrial makeup water, directly increasing the consumption of excess condensate. This allows for the effective utilization of excess condensate, avoiding the double waste of high-quality condensate and heat, and reducing production costs. In addition, the ingenious mechanical opening and closing unit achieves self-connection and self-flow of the pipeline and water, requiring no external power or complex control circuits, and no manual operation, automatically ensuring the water supply to the primary water-using unit.

Description

Technical Field

[0001] This utility model relates to the field of steam condensate recovery and utilization technology, and in particular to a multi-stage steam condensate utilization system. Background Technology

[0002] Industrial steam condensate is an extremely valuable resource. Due to production and daily life needs, industrial enterprises typically have large-scale steam supply networks. During the process of steam transportation through pipelines and use in terminal steam-consuming equipment, a large amount of high-temperature condensate (typically 70°C–95°C) is generated. This condensate is pure and represents a valuable water and heat resource. Recycling steam condensate for reuse is currently an important task for enterprises in terms of energy conservation, emission reduction, and lowering operating costs.

[0003] The current common practice is to recover steam condensate into a centralized tank and then prioritize its use for makeup water in production equipment with the highest water quality requirements, such as steam drums. The steam drums use this water to heat the reactor or remove reaction heat, and to generate byproduct steam. However, this single condensate reuse model has drawbacks. When the amount of makeup water in the steam drum is less than the amount of condensate recovered, the excess high-temperature condensate in the tank cannot be effectively utilized and can only accumulate or be discharged, resulting in a double waste of high-quality condensate and heat. Furthermore, the opening and closing of pipelines and the flow of water rely on valves and pumps, which require manual operation or complex control circuits; they cannot be achieved through purely mechanical structures to automatically open and close pipelines and allow for self-flowing water. Utility Model Content

[0004] The purpose of this invention is to overcome the above-mentioned technical deficiencies and propose a multi-stage steam condensate utilization system. This system solves the technical problems in the existing single condensate recycling mode, which easily leads to the double waste of high-quality condensate and heat, and cannot rely on a purely mechanical structure to achieve the self-connection and self-flow of pipelines and water.

[0005] To achieve the above technical objectives, the present invention provides a multi-stage steam condensate utilization system, comprising: The recycling unit includes a storage tank and a partition plate. The partition plate is fixed inside the storage tank to separate a first water storage chamber and a second water storage chamber from bottom to top inside the storage tank. The partition plate is provided with an outlet that connects the first water storage chamber and the second water storage chamber. An opening and closing unit is disposed in the first water storage chamber. It includes a sensor and a blocking component connected to each other. The sensor floats on the water surface and can push the blocking component to block the flow port as the water surface rises or pull the blocking component away from the flow port as the water surface falls. The primary water-using unit has its inlet end connected to the first water storage chamber; The secondary water-using unit has its inlet end connected to the middle of the second water storage chamber.

[0006] Furthermore, the storage tank is provided with a first water outlet that communicates with the bottom of the first water storage chamber, and the water inlet of the primary water unit is connected to the first water outlet.

[0007] Furthermore, the storage tank is also provided with a second water outlet that communicates with the middle of the second water storage chamber, and the water inlet of the secondary water unit is connected to the second water outlet.

[0008] Furthermore, the storage tank is also provided with a water inlet that communicates with the top of the second water storage chamber, and the water inlet is connected to the water outlet of the production system.

[0009] Furthermore, the recycling unit also includes a first one-way valve, the outlet of which is connected to the inlet, and the inlet of which is connected to the outlet of the production system.

[0010] Furthermore, the storage tank is also provided with an air inlet that communicates with the top of the first water storage chamber.

[0011] Furthermore, the recovery unit also includes a second one-way valve, the outlet of which is connected to the air inlet.

[0012] Furthermore, the opening and closing unit also includes a connecting pipe, one end of which is connected to the flow port. The sensing element can push the sealing element to block the other end of the connecting pipe as the water level rises or pull the sealing element away from the other end of the connecting pipe as the water level falls.

[0013] Furthermore, the connecting pipe includes a first vertical pipe, a second vertical pipe, and a horizontal pipe. The upper end of the first vertical pipe is open and connected to the flow port. The lower end of the first vertical pipe is sealed. The upper end of the second vertical pipe is sealed and fixedly connected to the partition. The lower end of the second vertical pipe is open. The two ends of the horizontal pipe are connected to the first vertical pipe and the second vertical pipe, respectively. The sealing member is partially and slidably disposed inside the second vertical pipe. During the up-and-down movement of the sealing member, it can seal the opening of the horizontal pipe or move away from the opening of the horizontal pipe.

[0014] Furthermore, the opening and closing unit also includes a transmission component, the middle part of which is hinged to the storage tank, and both ends of which are connected to the sensing component and the sealing component, respectively, so as to convert the downward movement of the sensing component into the upward movement of the sealing component or the upward movement of the sensing component into the downward movement of the sealing component.

[0015] Compared with the prior art, the beneficial effects of this utility model include: During use, the steam condensate generated during the production process enters the second water storage chamber. The condensate in the second water storage chamber then flows into the first water storage chamber through the overflow port. When the primary water-using unit is working, the condensate in the first water storage chamber enters the primary water-using unit, thus replenishing it. When the replenishment amount of the primary water-using unit is less than the condensate recovery amount, the condensate in the first water storage chamber increases, and the water level rises. Because the sensing element can push the sealing element to block the overflow port as the water level rises, the condensate in the second water storage chamber can no longer enter the first water storage chamber through the overflow port. Therefore, the condensate in the second water storage chamber increases, and the water level rises further. As the water level rises, when it reaches the inlet of the secondary water unit, the condensate in the second water storage chamber enters the secondary water unit, thus supplying water to it. This multi-stage steam condensate utilization system uses high-quality condensate that might otherwise accumulate or be discharged to replace part of the industrial makeup water, directly increasing the consumption of excess condensate. This allows excess condensate to be effectively utilized, avoiding the double waste of high-quality condensate and heat, and reducing production costs. In addition, the clever mechanical opening and closing unit enables the self-connection and self-flow of the pipeline and water circuit, requiring no external power or complex control circuits, and no manual operation, automatically ensuring the water supply to the primary water unit. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a multi-stage steam condensate utilization system provided by this utility model; Figure 2 This is a schematic diagram of the structure of a multi-stage steam condensate utilization system provided by this utility model, omitting the primary water-using unit and the secondary water-using unit; Figure 3 This is a schematic diagram of the opening and closing unit provided by this utility model; In the diagram: 100 - Recovery unit, 110 - Storage tank, 111 - First water storage chamber, 112 - Second water storage chamber, 113 - First outlet, 114 - Second outlet, 115 - Inlet, 116 - Air inlet, 120 - Baffle plate, 121 - Flow port, 130 - First check valve, 140 - Second check valve, 200 - Opening / closing unit, 210 - Sensor, 220 - Sealing component, 230 - Connecting pipe, 231 - First vertical pipe, 232 - Second vertical pipe, 233 - Horizontal pipe, 240 - Transmission component, 241 - Rotating rod, 242 - First connecting rod, 243 - Second connecting rod, 300 - Primary water unit, 310 - Steam drum, 320 - Reactor, 400 - Secondary water unit, 410 - Circulating water tank, 420 - Heat exchanger. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0018] This utility model provides a multi-stage utilization system for steam condensate, the structure of which is as follows: Figure 1 - Figure 3 As shown, the system includes a recycling unit 100, an opening and closing unit 200, a primary water supply unit 300, and a secondary water supply unit 400. The recycling unit 100 includes a storage tank 110 and a partition 120. The partition 120 is fixed inside the storage tank 110 to divide the storage tank 110 into a first water storage chamber 111 and a second water storage chamber 112 from bottom to top. The partition 120 has an outlet 121 that connects the first water storage chamber 111 and the second water storage chamber 112. The opening and closing unit 200... The device 0 is located in the first water storage chamber 111 and includes a sensor 210 and a sealing element 220 connected to each other. The sensor 210 floats on the water surface and can push the sealing element 220 to block the flow outlet 121 as the water level rises or pull the sealing element 220 away from the flow outlet 121 as the water level falls. The water inlet of the primary water unit 300 is connected to the first water storage chamber 111. The water inlet of the secondary water unit 400 is connected to the middle of the second water storage chamber 112.

[0019] During use, the condensate from the steam generated during production enters the second water storage chamber 112. The condensate in the second water storage chamber 112 then flows into the first water storage chamber 111 through the flow port 121. When the primary water-using unit 300 is operating, the condensate in the first water storage chamber 111 flows into the primary water-using unit 300, thus replenishing the primary water-using unit 300. When the replenishment amount of the primary water-using unit 300 is less than the condensate recovery amount, the condensate in the first water storage chamber 111 increases, and the water level rises. Since the sensing element 210 can push the sealing element 220 to block the flow port 121 as the water level rises, the condensate in the second water storage chamber 112 can no longer enter the first water storage chamber 111 through the flow port 121. The amount of condensate in the second water storage chamber 112 will increase, and the water level will rise. When the water level reaches the inlet of the secondary water unit 400, the condensate in the second water storage chamber 112 will enter the secondary water unit 400, thereby supplying water to the secondary water unit 400. This multi-stage steam condensate utilization system uses high-quality condensate that might otherwise accumulate or be discharged to replace part of the industrial makeup water, directly increasing the consumption of excess condensate. This allows excess condensate to be effectively utilized, avoiding the double waste of high-quality condensate and heat, and reducing production costs. In addition, the system achieves self-connection and self-flow of the pipeline and water through a clever mechanical opening and closing unit. It can automatically ensure the water supply to the primary water unit without external power, complex control circuits, or manual operation.

[0020] As a preferred embodiment, please refer to Figure 1 and Figure 2 The storage tank 110 is provided with a first water outlet 113 that communicates with the bottom of the first water storage chamber 111. The water inlet of the primary water unit 300 is connected to the first water outlet 113. The condensate in the first water storage chamber 111 can enter the primary water unit 300 through the first water outlet 113, thereby replenishing water to the primary water unit 300.

[0021] As a preferred embodiment, please refer to Figure 1 and Figure 2 The storage tank 110 is also provided with a second water outlet 114 that communicates with the middle of the second water storage chamber 112. The water inlet of the secondary water unit 400 is connected to the second water outlet 114. The condensate in the second water storage chamber 112 can enter the secondary water unit 400 through the second water outlet 114, thereby replenishing water to the secondary water unit 400.

[0022] As a preferred embodiment, please refer to Figure 2The storage tank 110 is also provided with a water inlet 115 that communicates with the top of the second water storage chamber 112. The water inlet 115 is connected to the water outlet of the production system. The steam condensate generated during the production process can enter the second water storage chamber 112 through the water inlet 115.

[0023] As a preferred embodiment, please refer to Figure 2 The recovery unit 100 further includes a first one-way valve 130. The outlet end of the first one-way valve 130 is connected to the inlet 115, and the inlet end of the first one-way valve 130 is connected to the outlet end of the production system. The steam condensate generated during the production process can enter the second water storage chamber 112 through the first one-way valve 130 and the inlet 115. The condensate in the second water storage chamber 112 cannot flow back into the production system through the inlet 115 and the first one-way valve 130.

[0024] As a preferred embodiment, please refer to Figure 2 The storage tank 110 is also provided with an air inlet 116 that communicates with the top of the first water storage chamber 111. When the condensate in the first water storage chamber 111 reaches the preset water level, an appropriate amount of air can be injected into the top of the first water storage chamber 111 through the air inlet 116 to increase the pressure above the condensate in the first water storage chamber 111 and improve the driving effect on the condensate.

[0025] As a preferred embodiment, please refer to Figure 2 The recovery unit 100 further includes a second one-way valve 140. The outlet end of the second one-way valve 140 is connected to the air inlet 116. The outlet end of the air source is connected to the inlet end of the second one-way valve 140. An appropriate amount of air can be injected into the top of the first water storage chamber 111 through the air source. The second one-way valve 140 ensures that air can only enter the first water storage chamber 111 through the second one-way valve 140 and the air inlet 116. The air in the first water storage chamber 111 cannot be discharged to the outside through the air inlet 116 and the second one-way valve 140.

[0026] As a preferred embodiment, please refer to Figure 3 The sensing element 210 is a floating ball that can float on the water surface and move up and down with the rise and fall of the water surface.

[0027] As a preferred embodiment, please refer to Figure 3 The sealing element 220 is a piston, which can block the flow port 121.

[0028] As a preferred embodiment, please refer to Figure 2 and Figure 3The opening and closing unit 200 also includes a connecting pipe 230, one end of which is connected to the flow port 121. The sensing element 210 can push the blocking element 220 to block the other end of the connecting pipe 230 as the water level rises, or pull the blocking element 220 away from the other end of the connecting pipe 230 as the water level falls. The connecting pipe 230 is set up so that the flow port 121 can be blocked by blocking the connecting pipe 230.

[0029] As a preferred embodiment, please refer to Figure 2 and Figure 3 The connecting pipe 230 includes a first vertical pipe 231, a second vertical pipe 232, and a horizontal pipe 233. The upper end of the first vertical pipe 231 is open and connected to the flow port 121. The lower end of the first vertical pipe 231 is sealed. The upper end of the second vertical pipe 232 is sealed and fixedly connected to the partition 120. The lower end of the second vertical pipe 232 is open. The two ends of the horizontal pipe 233 are connected to the first vertical pipe 231 and the second vertical pipe 232, respectively. The sealing member 220 is partially and slidably disposed in the second vertical pipe 232. During the up-and-down movement of the sealing member 220, it can seal the opening of the horizontal pipe 233 or move away from the opening of the horizontal pipe 233. The second vertical pipe 232 can guide the movement of the sealing member 220, thereby improving the sealing effect of the sealing member 220.

[0030] As a preferred embodiment, please refer to Figure 2 and Figure 3 The opening and closing unit 200 further includes a transmission component 240. The middle part of the transmission component 240 is hinged to the storage tank 110. The two ends of the transmission component 240 are respectively connected to the sensing component 210 and the sealing component 220, so as to convert the downward movement of the sensing component 210 into the upward movement of the sealing component 220 or the upward movement of the sensing component 210 into the downward movement of the sealing component 220. Thus, the up and down movement of the sealing component 220 can be achieved by the up and down movement of the sensing component 210.

[0031] As a preferred embodiment, please refer to Figure 2 and Figure 3The transmission component 240 includes a rotating rod 241, a first connecting rod 242, and a second connecting rod 243. The middle part of the rotating rod 241 is hinged to the storage tank 110. The upper end of the first connecting rod 242 is hinged to one end of the rotating rod 241, and the lower end of the first connecting rod 242 is hinged to the sensing element 210. The lower end of the second connecting rod 243 is hinged to the other end of the rotating rod 241, and the upper end of the second connecting rod 243 is hinged to the sealing element 220. When condensate in the first water storage chamber 111 enters... When water is added to the primary water unit, the water level in the first water storage chamber 111 drops. The sensor 210 moves downwards as the water level drops. The sensor, via the transmission action of the first connecting rod 242, drives the rotating rod 241 to rotate, causing the other end of the rotating rod 241 to move upwards. This, in turn, drives the sealing member 220 upwards via the second connecting rod 243, allowing the sealing member 220 to be removed from the opening of the horizontal pipe 233. The condensate in the second water storage chamber 112 then sequentially enters the overflow port 121, the first vertical pipe 231, the horizontal pipe 233, and the second vertical pipe 232, before entering the first water storage chamber 111 through the opening at the lower end of the second vertical pipe 232, thus replenishing the first water storage chamber 111. As the water level in the first water storage chamber 111 rises, the sensor 210 moves upwards as the water level rises. The sensor 210, via the transmission action of the first connecting rod 242, drives the rotating rod 241 to rotate, causing the other end of the rotating rod 241 to move upwards. This movement, in turn, drives the sealing member 220 upwards via the transmission action of the first connecting rod 242. Rotating rod 241 causes the other end of the rotating rod 241 to move downwards, and via the second connecting rod 243, drives the sealing member 220 to move downwards, so that the sealing member 220 re-seals the opening of the horizontal pipe 233, stopping the replenishment of water into the first water storage chamber 111. The structure of the opening and closing unit 200 can ensure that the first water storage chamber 111 always contains a preset capacity of condensate, thereby meeting the need for the condensate in the first water storage chamber 111 to replenish water into the primary water use unit.

[0032] As a preferred embodiment, please refer to Figure 1 The primary water supply unit 300 includes a steam drum 310 and a reactor 320. The inlet of the steam drum 310 is connected to the first outlet 113, and the outlet of the steam drum 310 is connected to the inlet of the reactor 330. The steam drum 310 is used to supply water to the reactor 320 to meet the water demand of the reactor 320.

[0033] In a preferred embodiment, the steam condensate discharged from the outlet of the reactor 320 can enter the second water storage chamber 112 through a pipeline to achieve internal circulation of the condensate.

[0034] As a preferred embodiment, please refer to Figure 1The secondary water unit 400 includes a circulating water tank 410 and a heat exchanger 420. The inlet of the circulating water tank 410 is connected to the second outlet 114, and the outlet of the circulating water tank 410 is connected to the inlet of the heat exchanger 420. The circulating water tank 410 is used to supply water to the heat exchanger 420. This multi-stage utilization system for steam condensate can replenish the circulating water tank 410 with low-hardness, near-zero-impurity condensate, which can effectively reduce the overall concentration and hardness of the circulating water system, delay and control the scaling and corrosion rate of the heat exchanger 420 from the source, extend the equipment life, and maintain heat exchange efficiency. In addition, the heat carried by the condensate is carried into the circulating water tank 410, which is equivalent to preheating the circulating water. Especially in winter, it can reduce the load on the cooling tower and realize the secondary utilization of thermal energy.

[0035] In a preferred embodiment, the steam condensate discharged from the outlet of the heat exchanger 420 can enter the second water storage chamber 112 through a pipeline to achieve internal circulation of the condensate.

[0036] To better understand this utility model, the following is combined with... Figure 1 - Figure 3 The working principle of the technical solution of this utility model will be described in detail below: During use, the condensate from the steam generated during production enters the second water storage chamber 112. When the condensate in the first water storage chamber 111 enters the steam drum 310 to replenish water to the steam drum 310, the water level in the first water storage chamber 111 drops. The sensing element 210 moves downward as the water level drops. The sensing element, through the transmission action of the first connecting rod 242, drives the rotating rod 241 to rotate, causing the other end of the rotating rod 241 to move upward. This movement, via the second connecting rod 243, drives the sealing element 220 to move upward, allowing the sealing element 220 to exit through the horizontal pipe 233. The outlet is removed, and the condensate in the second water storage chamber 112 sequentially enters the overflow outlet 121, the first vertical pipe 231, the horizontal pipe 233, and the second vertical pipe 232, and then enters the first water storage chamber 111 through the opening at the lower end of the second vertical pipe 232, thereby replenishing the first water storage chamber 111 with water. As the water level in the first water storage chamber 111 rises, the sensor 210 moves upward with the rising water level. The sensor 210 drives the rotating rod 241 to rotate via the transmission action of the first connecting rod 242, causing the other end of the rotating rod 241 to move downward, and then through the second connecting rod 242... Rod 243 drives the sealing member 220 downward, causing the sealing member 220 to re-seal the opening of the horizontal pipe 233, stopping the replenishment of water into the first water storage chamber 111. The structure of the opening and closing unit 200 ensures that the first water storage chamber 111 always contains a preset capacity of condensate, thereby meeting the need for the condensate in the first water storage chamber 111 to replenish the steam drum 310. When the replenishment amount of the steam drum 310 is less than the condensate recovery amount, the condensate in the second water storage chamber 112 will increase, and the water level will rise. When the water level reaches the second outlet 114 or a preset height, the... The condensate in the second water storage chamber 112 enters the circulating water tank 410, thereby supplying water to the circulating water tank 410. This multi-stage steam condensate utilization system uses the high-quality condensate that might otherwise accumulate or be discharged to replace part of the industrial makeup water, directly increasing the consumption of excess condensate. This allows the excess condensate to be effectively utilized, avoiding the double waste of high-quality condensate and heat, and reducing production costs. In addition, the clever mechanical opening and closing unit realizes the self-connection and self-flow of the pipeline and the water circuit. It can automatically ensure the water supply of the primary water-using unit without external power and complex control circuits or manual operation.

[0037] The multi-stage steam condensate utilization system provided by this utility model has the following beneficial effects: (1) In this steam condensate multi-stage utilization system, an appropriate amount of air can be injected into the top of the first water storage chamber 111 through the air inlet 116 to increase the pressure above the condensate in the first water storage chamber 111 and improve the driving effect on the condensate. (2) This steam condensate multi-stage utilization system can replenish the circulating water pool 410 with low hardness and almost zero impurities condensate, which can effectively reduce the overall concentration and hardness of the circulating water system, delay and control the scaling and corrosion rate of the heat exchanger 420 from the source, extend the equipment life, maintain heat exchange efficiency, and the heat carried by the condensate is carried into the circulating water pool 410, which is equivalent to preheating the circulating water, especially in winter, which can reduce the load on the cooling tower and realize the secondary utilization of thermal energy. (3) This steam condensate multi-stage utilization system uses the high-quality condensate that might otherwise accumulate or be discharged to replace part of the industrial makeup water, directly increasing the consumption of excess condensate, so that excess condensate can be effectively utilized, avoiding the double waste of high-quality condensate and heat, reducing production costs. In addition, through the ingenious mechanical opening and closing unit, the pipeline can be automatically opened and closed and the water can flow automatically, without the need for external power and complex control circuits, and without manual operation, the water supply of the primary water-using unit can be automatically guaranteed.

[0038] The specific embodiments of this utility model described above do not constitute a limitation on the scope of protection of this utility model. Any other corresponding changes and modifications made based on the technical concept of this utility model should be included within the scope of protection of the claims of this utility model.

Claims

1. A multi-stage steam condensate utilization system, characterized in that, include: The recycling unit includes a storage tank and a partition plate. The partition plate is fixed inside the storage tank to separate a first water storage chamber and a second water storage chamber from bottom to top inside the storage tank. The partition plate is provided with an outlet that connects the first water storage chamber and the second water storage chamber. An opening and closing unit is disposed in the first water storage chamber. It includes a sensor and a blocking component connected to each other. The sensor floats on the water surface and can push the blocking component to block the flow port as the water surface rises or pull the blocking component away from the flow port as the water surface falls. The primary water-using unit has its inlet end connected to the first water storage chamber; The secondary water-using unit has its inlet end connected to the middle of the second water storage chamber.

2. The multi-stage steam condensate utilization system according to claim 1, characterized in that, The storage tank has a first water outlet that communicates with the bottom of the first water storage chamber, and the water inlet of the primary water unit is connected to the first water outlet.

3. The multi-stage steam condensate utilization system according to claim 1, characterized in that, The storage tank is also provided with a second water outlet that communicates with the middle of the second water storage chamber, and the water inlet of the secondary water unit is connected to the second water outlet.

4. The multi-stage steam condensate utilization system according to claim 1, characterized in that, The storage tank is also provided with a water inlet that communicates with the top of the second water storage chamber, and the water inlet is connected to the water outlet of the production system.

5. The multi-stage steam condensate utilization system according to claim 4, characterized in that, The recycling unit also includes a first one-way valve, the outlet of which is connected to the inlet, and the inlet of which is connected to the outlet of the production system.

6. The multi-stage steam condensate utilization system according to claim 1, characterized in that, The storage tank is also provided with an air inlet that communicates with the top of the first water storage chamber.

7. The steam condensate multi-stage utilization system according to claim 6, characterized in that, The recovery unit also includes a second one-way valve, the outlet of which is connected to the air inlet.

8. The multi-stage steam condensate utilization system according to claim 1, characterized in that, The opening and closing unit also includes a connecting pipe, one end of which is connected to the flow port. The sensing element can push the sealing element to block the other end of the connecting pipe as the water level rises or pull the sealing element away from the other end of the connecting pipe as the water level falls.

9. The multi-stage steam condensate utilization system according to claim 8, characterized in that, The connecting pipe includes a first vertical pipe, a second vertical pipe, and a horizontal pipe. The upper end of the first vertical pipe is open and connected to the flow port. The lower end of the first vertical pipe is sealed. The upper end of the second vertical pipe is sealed and fixedly connected to the partition. The lower end of the second vertical pipe is open. The two ends of the horizontal pipe are connected to the first vertical pipe and the second vertical pipe, respectively. The sealing member is partially and slidably disposed inside the second vertical pipe. During the up-and-down movement of the sealing member, it can seal the opening of the horizontal pipe or move away from the opening of the horizontal pipe.

10. The multi-stage steam condensate utilization system according to claim 1, characterized in that, The opening and closing unit also includes a transmission component, the middle part of which is hinged to the storage tank, and the two ends of which are respectively connected to the sensing component and the sealing component, so as to convert the downward movement of the sensing component into the upward movement of the sealing component or the upward movement of the sensing component into the downward movement of the sealing component.

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