A high-efficiency steam trap collection, recycling and utilization system and its usage method

Abstract

The object of the present invention is to provide a steam condensate efficient collection and recycling system and its usage method, for the high-efficiency collection and recycling of factory steam condensate, so as to solve the problems of steam leakage of steam traps and flash steam evacuation in the traditional factory condensate recovery system, and to solve the problems of high energy consumption and low efficiency existing in the traditional condensate collection device; To achieve the above object, the solution of the present invention is to provide a steam condensate efficient collection and recycling system, including: steam heating equipment, buffer device, pressure equalizing device, centralized condensate device and recycling system; There are several sets of the steam heating equipment and the buffer device respectively. The steam heating equipment is connected in parallel to the condensate collecting pipe through the buffer device. The condensate collecting pipe leads into the pressure equalizing device. The pressure equalizing device is connected to the centralized condensate device through a pipeline. The centralized condensate device returns the steam to the steam heating equipment through the recycling system.

Description

Technical Field

[0001] The present invention relates to the technical field of steam, and particularly to a steam condensate efficient collection, recovery and utilization system and its usage method. Background Art

[0002] In a steam system, due to the steam-blocking and drainage function of the steam trap itself, at least one steam trap is equipped for each heat-using device in the system. There are clear requirements for the selection of steam traps, and there are a wide variety of them. Heat-using devices with large heat loads need to be equipped with multiple steam traps in parallel. Generally, a rubber factory requires dozens of steam traps, and a tire enterprise requires thousands of steam traps.

[0003] The working conditions of steam traps are harsh and the actions are frequent. The effective life of steam traps is short, and they are prone to steam leakage or blockage. When saturated steam condensate passes through the flow holes of the steam trap, flash steam will be generated, and the higher the working pressure, the greater the flash steam volume. The leaked fresh steam and flash steam of condensate fill the condensate pipeline, making it difficult for the system to be closed, and the system becomes an open system, resulting in serious energy waste. The application of steam traps has the following defects:

[0004] 1. Intermittent drainage, which easily causes steam blockage in the equipment, uneven heating surface temperature, and easily leads to defective products.

[0005] 2. The steam trap switches frequently. When the steam trap works, the high-speed water-vapor two-phase flow rubs the sealing surface and leaks, resulting in many failures.

[0006] 3. The steam trap drains water through small holes, which is prone to blockage failures. It is necessary to open a bypass of the steam trap to meet the temperature requirements of production, resulting in steam leakage, increased condensate recovery pressure, poor condensate drainage, and affecting other normal working machines.

[0007] 4. The failures of steam traps and the opening of bypasses of steam traps cause steam leakage. There is a certain limit to the recovery of low-temperature heat sources. When the quantity is large, there is no place to fully utilize it, and it can only be discharged, resulting in energy waste.

[0008] 5. In the closed-loop recovery system of steam traps, spraying recovery is used to reduce the condensate back pressure, and it is difficult to recycle low-grade hot water. It can only be discharged into the drainage ditch, wasting not only heat energy but also a large amount of fresh water.

[0009] 6. The failures of steam traps focus on maintenance, but insufficient attention is paid to energy waste and the impact on product quality.

[0010] The steam condensate recovery system is changed from an open system to a closed system. The steam trap is frequently switched on and off during use (more than 2 million times a year), and the condensate is prone to contain impurities, resulting in wear and damage of the steam trap spool and steam leakage. In a closed system, it is difficult to detect a leaking steam trap. After the steam trap leaks steam, the pressure of the condensate pipe rises, the back pressure of the steam trap increases, and the steam trap malfunctions and cannot drain condensate. Most of the condensate recovery systems are open systems (venting steam to the air). The system composition includes: steam heating equipment + steam trap + condensate recovery main pipe + condensate tank (generally with a flash steam vent pipe) + condensate pump + condensate reuse. For the closed condensate reuse system, to reduce the back pressure of the condensate main pipe, most use other equipment to replace the condensate tank. For example, a steam-water separator replaces the condensate tank, and the flash steam and condensate are respectively recovered and utilized. For example, a heat exchanger or a spray recovery device replaces the condensate tank to recover the heat energy of the condensate. This technology can only recover low-grade hot water.

[0011] CN1690523 relates to an unequal-pressure high-efficiency steam heating system, which uses a pressure equalizer to automatically equalize the pressure of the condensate from heat-using equipment with different pressure grades in the collecting pipe, fixes the pressure through a pressure fixing device, and all is recovered to the heat source for reuse by an adjusting device or a steam boosting device. Since the system is truly closed, the steam leakage of the steam trap is eliminated, the latent heat of the steam is fully utilized in the heat-using equipment, and the condensate and its sensible heat are also effectively recovered and utilized.

[0012] CN203471898U, a steam heating system for a hot press, includes a steam boiler, a steam storage tank, and a hot water pool. The steam boiler is connected to the inlet of the steam storage tank through a pipeline, the outlet of the steam storage tank is connected to the hot press through a pipeline, a first valve is arranged at the outlet of the steam storage tank, the hot press is connected to the hot water pool through a pipeline, and the hot water pool is connected to the steam boiler through a pipeline provided with a water pump. For this steam heating system, a first valve is arranged at the outlet of the gas storage tank, which can achieve a throttling function and avoid waste of steam.

[0013] In CN1690523, there is a hypothetical water line in the system and a pressure fixing device. Depending on the changes of the pressure fixing device and the hypothetical water line, the condensate is discharged, and the principle of the gravity of the condensate and the U-shaped pipe is used to drain the condensate. The steam pressures of different equipment are different, but the steam pressure inside the heat-using equipment does not change. In actual situations, facing the change of the steam pressure inside the heat equipment, this system has loopholes. This system does not have a buffer device. If the heat-using equipment is temperature-controlled and the internal steam pressure fluctuates, when the pressure of the heating equipment is lower than the pressure of the condensate pipe, the condensate in the system pipeline will return to the heating equipment, easily causing the risk of damage to the heating equipment and unstable heating process temperature.

[0014] Therefore, it is an urgent technical problem to provide a high-efficiency steam condensate collection and recovery utilization system applicable to a variable-pressure system in the steam technology field. Summary of the Invention

[0015] The object of the present invention is to provide a steam condensate efficient collection and recycling system and its usage method, for the efficient collection and recycling of plant steam condensate, so as to solve the problems of steam leakage of steam traps and flashing steam evacuation in traditional plant condensate recovery systems, and to solve the problems of high energy consumption and low efficiency existing in traditional condensate collection devices.

[0016] To achieve the above object, the solution of the present invention is to provide a steam condensate efficient collection and recycling system, including: a steam heating device, a buffer device, a pressure equalizing device, a centralized condensate device and a recycling system;

[0017] There are several of the steam heating devices and the buffer devices respectively. The steam heating devices are connected in parallel to the condensate collecting pipe through the buffer devices. The condensate collecting pipe leads into the pressure equalizing device. The pressure equalizing device is connected to the centralized condensate device through a pipeline. The centralized condensate device returns the steam to the steam heating device through the recycling system.

[0018] Further, the buffer device includes a buffer tank and a first float valve group and a spring wedge valve group arranged inside it. The two ends of the buffer tank are respectively provided with a first water inlet and a first water outlet. A filter plate is arranged between the first water inlet and the first float valve group.

[0019] Further, the pressure equalizing device includes: a water storage chamber and a spring float valve group and a support float valve group arranged inside it. The water storage chamber is divided into a first chamber and a second chamber by a partition board. A second water inlet is arranged on the side wall of the first chamber. A sewage discharge port is arranged at the bottom of the first chamber. A second water outlet is arranged on the side wall of the second chamber. The spring float valve group is arranged on the partition board. The support float valve group is arranged in the second chamber and cooperates with the second water outlet.

[0020] Further, the centralized condensate device includes: a device support, a water inlet pipe, a first cylinder and a second cylinder. The water inlet pipe, the first cylinder and the second cylinder are arranged on the device support. The water inlet pipe, the first cylinder and the second cylinder are sequentially connected through pipelines. A second float valve group and a wedge valve group are arranged inside the first cylinder. A third float valve group is arranged inside the second cylinder;

[0021] One end of the water inlet pipe is provided with a third water inlet, and the other end of the water inlet pipe is provided with a sewage discharge port. A first steam return port is arranged at the top of the first cylinder. A second steam return port and a condensate outlet are arranged at the top of the second cylinder. The condensate outlet is connected to the third float valve group in a cooperative manner.

[0022] Further, the recycling system includes: a deaerator, a boiler, and a steam header connected in sequence through a steam pipeline. The deaerator is connected to the centralized condensate drainage device, the steam header is connected to the main steam supply pipeline, and the steam heating equipment is connected in parallel to the main steam supply pipeline.

[0023] Further, cut-off valves and check valves are provided behind the steam heating equipment, the buffer device, the pressure equalizing device, and the centralized condensate drainage device to prevent interference between various devices in the system.

[0024] Further, the steam heating equipment can generate condensates with different pressures, and the number of the pressure equalizing device and the condensate collecting pipe is consistent with it.

[0025] The present invention also provides a method for using the above system, including: the steam produced by the boiler enters the main steam supply pipeline after passing through the steam header, and is distributed to the steam heating equipment by the main steam supply pipeline. After the steam completes heat exchange in the steam heating equipment, condensates are generated. The mixture of condensates and steam enters the buffer device, and the pressure of the condensates remains stable after passing through the buffer device; the condensates with the same pressure flow out of the buffer device and enter the same condensate collecting pipe, and then enter the pressure equalizing device. The pressure equalizing device can adjust the pressure of the condensates to a fixed value; the condensates are collected into the same pipeline after passing through the pressure equalizing device and enter the centralized condensate drainage device; the centralized condensate drainage device can realize automatic flow adjustment of the condensates, changing from intermittent condensate drainage to continuous automatic condensate drainage. The condensates are discharged through the condensate outlet, and the residual steam in the centralized condensate drainage device enters the recycling system through the first steam return port and the second steam return port.

[0026] Advantages of the present invention:

[0027] 1. The system is complete, the steam heating equipment has higher condensate drainage efficiency, there is no leakage of new steam in the system, the heat energy utilization rate of the heating equipment is higher, and traditional steam traps are not used. The utilization rate of the latent heat of steam (except for surface heat dissipation) is nearly 100%.

[0028] 2. Condensate recovery does not require a condensate tank and a condensate pump. The centralized condensate drainage device automatically drains condensate to the recovery position by relying on its own back pressure, without electric and pneumatic devices.

[0029] 3. This system has no electric and pneumatic power machinery, no drain pipe and cold water spray system. Therefore, this system has high reliability, simple maintenance, and a long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 is a schematic diagram of a steam condensate efficient collection and recycling system provided by the present invention;

[0031] Figure 2 is a schematic diagram of the buffer device provided by the present invention;

[0032] Figure 3 is a schematic diagram of the pressure equalizing device provided by the present invention;

[0033] Figure 4 is a schematic diagram of the centralized drain device provided by the present invention.

[0034] As shown in the figure, 1 - boiler, 2 - steam separator, 3 - steam heating equipment, 4 - buffer device, 5 - pressure equalizing device, 6 - centralized drain device, 7 - deaerator, 41 - first water inlet, 42 - filter plate, 43 - first float valve group, 44 - first water outlet, 45 - spring wedge valve group, 51 - second water inlet, 52 - first chamber, 53 - spring float valve group, 54 - partition plate, 55 - second chamber, 56 - support float valve group, 57 - second water outlet, 61 - third water inlet, 62 - water inlet pipe, 63 - second float valve group, 64 - wedge valve group, 65 - first steam return port, 66 - first cylinder, 67 - second steam return port, 68 - drain outlet, 69 - third float valve group, 610 - second cylinder. Detailed implementation manners

[0035] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0036] As Figure 1 shown, a steam drain efficient collection and recycling system includes: a steam heating equipment 3, a buffer device 4, a pressure equalizing device 5, a centralized drain device 6 and a recycling system; there are 2 sets of the steam heating equipment 3, and 8 sets of the buffer device 4. The steam heating equipment 3 is respectively connected in parallel to 2 of the drain collecting pipes through the buffer device 4. The pressures inside the 2 drain collecting pipes are different. Each drain collecting pipe is provided with a pressure equalizing device 5. The pressure equalizing device 5 is connected to the centralized drain device 6 through a pipeline. The centralized drain device 6 returns the steam to the steam heating equipment 3 through the recycling system; the recycling system includes: a deaerator 7, a boiler 1 and a steam separator 2 that are sequentially connected through a steam pipeline. The deaerator 7 is connected to the centralized drain device 6. The steam separator 2 is connected to the steam supply main pipe. The steam heating equipment 3 is connected in parallel to the steam supply main pipe; cut-off valves and check valves are provided behind the steam heating equipment 3, the buffer device 4, the pressure equalizing device 5 and the centralized drain device 6 to prevent interference between the devices in the system; the steam heating equipment 3 can generate 2 kinds of drains with different pressures, which are respectively introduced into the 2 drain collecting pipes.

[0037] As Figure 2As shown, the buffer device 4 includes a buffer tank and a first float valve group 43 and a spring wedge valve group 45 disposed inside thereof. The two ends of the buffer tank are respectively provided with a first water inlet 41 and a first water outlet 44. A filter plate 42 is disposed between the first water inlet 41 and the first float valve group 43. The buffer device 4 responds to the periodic pressure fluctuations in the steam heating device 3 to ensure that the condensed water is discharged from the heating device in a timely manner.

[0038] As Figure 3 shown, the pressure equalizing device 5 includes a water storage chamber and a spring float valve group 53 and a support float valve group 56 disposed inside thereof. The water storage chamber is divided into a first chamber 52 and a second chamber 55 by a partition 54. A second water inlet 51 is provided on the side wall of the first chamber 52, and a sewage outlet is provided at the bottom of the first chamber 52. A second water outlet 57 is provided on the side wall of the second chamber 55. The spring float valve group 53 is disposed on the partition 54, and the support float valve group 56 is disposed in the second chamber 55 and cooperates with the second water outlet 57. The pressure equalizing device 5 makes the pressure of the condensed water consistent after passing through, and can be connected to the same centralized condensed water device 6 to realize centralized condensed water drainage.

[0039] As Figure 4 shown, the centralized condensed water device 6 includes a device support, a water inlet pipe 62, a first cylinder 66 and a second cylinder 610. The water inlet pipe 62, the first cylinder 66 and the second cylinder 610 are disposed on the device support. The water inlet pipe 62, the first cylinder 66 and the second cylinder 610 are sequentially connected by pipelines. A second float valve group 63 and a wedge valve group 64 are disposed inside the first cylinder 66. A third float valve group 69 is disposed inside the second cylinder 610. One end of the water inlet pipe 62 is provided with a third water inlet 61, and the other end of the water inlet pipe 62 is provided with a sewage outlet. A first steam return port 65 is provided at the top of the first cylinder 66. A second steam return port 67 and a condensed water outlet 68 are provided at the top of the second cylinder 610. The condensed water outlet 68 is cooperatively connected with the third float valve group 69 to realize automatic adjustment of the flow rate of the condensed water, changing from intermittent condensed water drainage to continuous automatic condensed water drainage.

[0040] Specific working process: The steam produced by the boiler 1 enters the steam heating main pipe after passing through the steam separator 2, and is distributed to the steam heating device 3 by the steam heating main pipe. After heat exchange is completed in the steam heating device 3, condensed water is generated. The mixture of condensed water and steam enters the buffer device 4. The filter plate 42 can remove the impurities contained in the condensed water. After the buffer tank operates normally, the amount of condensed water increases. When it reaches a certain liquid level, the buoyancy of the moving float increases, and the first float valve group 43 opens, and the buffer tank 3 starts to discharge condensed water; the first float valve group 43 freely adjusts the opening of the moving float according to the amount of condensed water, automatically adjusts the discharge amount of condensed water, and adapts to the change of the amount of condensed water under different working conditions of the steam heating device 3; for the spring wedge valve group 45, when the buffer device 4 discharges condensed water normally, it is always open under the action of elastic force. When the pressure of the steam heating device 3 is lower than the pressure of the condensed water collecting pipe, the spring wedge valve group 45 is forced to close to prevent the condensed water in the condensed water collecting pipe from flowing back into the buffer device 4, playing a check valve role. After the spring wedge valve group 45 closes, the water level inside the buffer tank rises, and the opening of the first float valve group 43 increases. When the pressure of the steam heating device 3 is higher than the pressure of the condensed water collecting pipe, the condensed water is discharged from the buffer device 4, and the liquid level of the buffer tank drops. When the liquid level drops to a certain position, the first float valve group 43 closes, and the buffer device 4 repeats the above cycle to discharge the condensed water of the steam heating device 3. After passing through the buffer device 4, the pressure of the condensed water remains stable;

[0041] The condensed water with the same pressure flows out of the buffer device 4 and then enters the same condensed water collecting pipe and then enters the pressure equalizing device 5. The condensed water under the same steam pressure enters the first chamber 52 through the horizontal condensed water collecting pipe. The amount of condensed water in the first chamber 52 increases, and the liquid level rises, and the spring float valve group 53 is opened, and the condensed water enters the second chamber 55 through the spring float valve group 53; between the first chamber 52 and the second chamber 55, the spring float valve group 53 is used to adjust the condensed water pressure of the first chamber 52 and the second chamber 55;

[0042] The amount of condensed water entering the second chamber 55 increases. When it reaches a certain liquid level, the support float valve group 56 is opened, and the condensed water is discharged from the pressure equalizing device 5 into the connecting pipe of the centralized condensed water device 6. The condensed water of the steam heating devices 3 with different steam pressures can be connected to one centralized condensed water device 6 after the pressure is adjusted by multiple pressure equalizing devices 5; the pressure equalizing device can adjust the pressure of the condensed water to a fixed value;

[0043] The hydrophobic water converges into the same pipeline after passing through the pressure equalizing device 5 and then enters the centralized hydrophobic device 6; the hydrophobic water enters the first cylinder 66 through the water inlet pipe 62 and passes through the second float valve group 63, thus ensuring that the hydrophobic water enters the first cylinder 66 in a timely manner. The second float valve group 63 adjusts the opening degree according to the amount of hydrophobic water, preventing the impact of steam and hydrophobic water on the centralized hydrophobic device 6 and acting as a check valve function in the absence of condensate; as more and more hydrophobic water enters the first cylinder 66, the hydrophobic water passes through the wedge valve group 64 and enters the second cylinder 610, and the opening degree of the wedge valve group 64 is automatically adjusted according to the amount of condensate; the first steam return port 65 and the second steam return port 67 on the upper parts of the first cylinder 66 and the second cylinder 610 are connected through a pipeline with a valve, artificially making the internal pressures of the first cylinder 66 and the second cylinder 610 consistent, enabling the wedge valve group 64 to work under an isobaric state, with the linkage mechanism being sensitive and reliable. The steam and water in the first cylinder 66 and the second cylinder 610 are separated, and the separated steam returns to the recovery and utilization system through the first steam return port 65 and the second steam return port 67, without steam leakage and discharge; the hydrophobic water that enters the second cylinder 610 of the centralized hydrophobic device 6 passes through the third float valve group 69 and is discharged to the hydrophobic main pipe through the hydrophobic outlet 68, and is directly sent to the hydrophobic reuse point through the hydrophobic main pipe; the centralized hydrophobic device 6 realizes automatic adjustment of the flow rate of the hydrophobic water, changing from intermittent hydrophobic drainage to continuous automatic hydrophobic drainage.

[0044] In addition to the natural heat dissipation loss in this system, all the condensate water and the entrained flash steam have been recovered and utilized; the thermal efficiency of the system is very close to the ideal energy utilization state, which is the first in the industry in the application of the rubber system. This technology has the following technological innovation points:

[0045] 1. The process temperature of the steam heating equipment 3 is stable, improving the product quality and creating value for customers

[0046] 2. There is no steam trap that needs to be frequently switched, saving the customer's maintenance cost

[0047] 3. It is more than 20% energy-saving compared with the conventional steam trap heating system, with considerable economic benefits

[0048] 4. Large-caliber drainage, with stable hydrophobic drainage and no blockage

[0049] 5. There is no steam leakage, the utilization rate is 100%, reducing the operating load of the boiler 1

[0050] 6. Closed-loop circulation heating system, energy-saving and emission-reducing, environmentally friendly

[0051] 7. The back pressure of the hydrophobic water is stable and adjustable, and the system has wide adaptability

[0052] 8. The installation and construction are simple, saving the customer's investment cost

[0053] 9. The equipment has wide adaptability and can automatically adjust the size of the hydrophobic water according to the change of the amount of hydrophobic water

[0054] 10. Automatically adapt to temperature and pressure changes and can meet different process requirements of customers

[0055] Obviously, the described embodiments are some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the present invention.

Claims

1. A steam trap efficient collection and recycling system, characterized in that, Including: A steam heating device (3), a buffer device (4), a pressure equalizing device (5), a centralized drain device (6) and a recycling system; There are several of the steam heating devices (3) and the buffer devices (4) respectively. The steam heating devices (3) are connected in parallel to a drain collecting pipe through the buffer devices (4). The drain collecting pipe leads into the pressure equalizing device (5). The pressure equalizing device (5) is connected to the centralized drain device (6) through a pipeline. The centralized drain device (6) returns the steam to the steam heating device (3) through the recycling system; The pressure equalizing device (5) includes: a water storage chamber and a spring float valve group (53) and a support float valve group (56) arranged inside it. The water storage chamber is divided into a first chamber (52) and a second chamber (55) by a partition board (54). A second water inlet (51) is provided on the side wall of the first chamber (52). A drain port is provided at the bottom of the first chamber (52). A second water outlet (57) is provided on the side wall of the second chamber (55). The spring float valve group (53) is arranged on the partition board (54). The support float valve group (56) is arranged in the second chamber (55) to cooperate with the second water outlet (57); The centralized drain device (6) includes: a device support, a water inlet pipe (62), a first cylinder (66) and a second cylinder (610). The water inlet pipe (62), the first cylinder (66) and the second cylinder (610) are arranged on the device support. The water inlet pipe (62), the first cylinder (66) and the second cylinder (610) are sequentially connected by pipelines. A second float valve group (63) and a wedge valve group (64) are arranged in the first cylinder (66). A third float valve group (69) is arranged in the second cylinder (610); One end of the water inlet pipe (62) is provided with a third water inlet (61). The other end of the water inlet pipe (62) is provided with a drain port. A first steam return port (65) is provided at the top of the first cylinder (66). A second steam return port (67) and a drain outlet (68) are provided at the top of the second cylinder (610). The drain outlet (68) is cooperatively connected to the third float valve group (69).

2. The steam trap high-efficiency collection and recycling system according to claim 1, characterized in that, The buffer device (4) includes a buffer tank and a first float valve group (43) and a spring wedge valve group (45) arranged inside it. The two ends of the buffer tank are respectively provided with a first water inlet (41) and a first water outlet (44). A filter plate (42) is arranged between the first water inlet (41) and the first float valve group (43).

3. A steam trap efficient collection and recycling system according to claim 1, characterized in that The recycling system includes: a deaerator (7), a boiler (1) and a steam distribution header (2) connected in sequence through a steam pipeline. The deaerator (7) is connected to the centralized drain device (6). The steam distribution header (2) is connected to a steam supply main pipe. The steam heating devices (3) are connected in parallel to the steam supply main pipe.

4. A steam trap efficient collection and recycling system according to claim 1, characterized in that Cut-off valves and check valves are provided behind the steam heating device (3), the buffer device (4), the pressure equalizing device (5) and the centralized drain device (6) to prevent interference between the various devices in the system.

5. The steam trap efficient collection and recycling system according to claim 1, characterized in that, The steam heating device (3) can generate drain water with different pressures, and the number of the pressure equalizing device (5) and the drain water collecting pipe is consistent with it.

6. A method for using the steam trap efficient collection and recycling system according to any one of claims 1 to 5, characterized in that, It includes: The steam produced by the boiler (1) enters the steam heating main pipe after passing through the steam distribution cylinder (2), and is distributed to the steam heating device (3) by the steam heating main pipe. After the steam completes heat exchange in the steam heating device (3), drain water is generated. The mixture of drain water and steam enters the buffer device (4), and the pressure of the drain water remains stable after passing through the buffer device (4); the drain water with the same pressure flows out of the buffer device (4) and then enters the same drain water collecting pipe and then enters the pressure equalizing device (5). The pressure equalizing device (5) can adjust the pressure of the drain water to a fixed value; the drain water is collected into the same pipeline after passing through the pressure equalizing device (5) and enters the centralized drain water device (6); the centralized drain water device (6) can realize automatic adjustment of the flow rate of the drain water, changing from intermittent drain water to continuous automatic drain water. The drain water is discharged through the drain water outlet (68), and the residual steam in the centralized drain water device (6) enters the recycling system through the first steam return port (65) and the second steam return port (67); Among them, the pressure equalizing device (5) includes: a water storage chamber and a spring float valve group (53) and a support float valve group (56) arranged inside it. The water storage chamber is divided into a first chamber (52) and a second chamber (55) by a partition board (54). A second water inlet (51) is arranged on the side wall of the first chamber (52), and a sewage outlet is arranged at the bottom of the first chamber (52). A second water outlet (57) is arranged on the side wall of the second chamber (55); the spring float valve group (53) is arranged on the partition board (54), and the support float valve group (56) is arranged in the second chamber (55) and cooperates with the second water outlet (57); The centralized drain water device (6) includes: a device support, a water inlet pipe (62), a first cylinder (66) and a second cylinder (610). The water inlet pipe (62), the first cylinder (66) and the second cylinder (610) are arranged on the device support, and the water inlet pipe (62), the first cylinder (66) and the second cylinder (610) are sequentially connected by pipelines. A second float valve group (63) and a wedge valve group (64) are arranged in the first cylinder (66), and a third float valve group (69) is arranged in the second cylinder (610); One end of the water inlet pipe (62) is provided with a third water inlet (61), and the other end of the water inlet pipe (62) is provided with a sewage outlet; a first steam return port (65) is arranged at the top of the first cylinder (66), and a second steam return port (67) and a drain water outlet (68) are arranged at the top of the second cylinder (610). The drain water outlet (68) is cooperatively connected with the third float valve group (69).

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