Steam condensate water recycling system

Abstract

The invention discloses a steam condensate water recycling and reusing system which comprises a steam condensate water recycling mechanism, a heat exchange mechanism, a preheating mechanism and a normal-temperature water recycling mechanism. The output end of the steam condensate recovery mechanism is connected with the first input end of the heat exchange mechanism, the first output end of the heat exchange mechanism is connected with the input end of the normal-temperature water recovery mechanism, and the output end of the normal-temperature water recovery mechanism is used for outputting normal-temperature water; the output end and the input end of the preheating mechanism are correspondingly connected with the second input end and the second output end of the heat exchange mechanism respectively, and the preheating mechanism is used for preheating regenerated air of the rotary dehumidifier; according to the steam condensate water recycling system, heat of steam condensate water can be collected and used for preheating regenerated air of the rotary dehumidifier, so that heat energy is recycled, the steam consumption of the rotary dehumidifier is reduced, and the energy utilization rate is increased.

Description

Technical Field

[0001] The invention relates to the technical field of energy recovery and utilization, and in particular to a steam condensate water recovery and reuse system. Background Art

[0002] At present, specific production areas in precision manufacturing industries such as lithium batteries and electronic manufacturing have extremely high requirements for air dew point temperature. These production links generally rely on a large amount of high-temperature steam to maintain the effective operation of the rotary dehumidification system; in the conventional dehumidification process, the steam is converted into high-temperature hot water above 90°C through the condensation process, and then it loses the ability to regenerate the rotary wheel; if the high-temperature hot water generated by the steam condensation process is directly discharged, it not only means that a large amount of heat energy is wasted, but also causes irreversible negative impacts on the surrounding ecological environment, such as thermal pollution.

[0003] In order to meet this challenge, the industry currently generally adopts the method of adding cooling tower equipment to deeply cool the steam condensate before discharging it; although this measure effectively avoids the problems caused by the direct discharge of high-temperature steam condensate, it also causes new resource and environmental problems: on the one hand, a large amount of heat energy is lost to the environment in this process and cannot be reasonably recovered and utilized; on the other hand, the cooling process itself consumes a large amount of high-grade electricity, which increases production costs; at the same time, the treated water resources are often directly discharged, and the recycling of water resources is not achieved, resulting in a waste of precious water resources.

[0004] It can be seen that the existing technology still needs to be improved and enhanced. Summary of the invention

[0005] In view of the above-mentioned deficiencies in the prior art, an object of the present invention is to provide a steam condensate water recovery and reuse system, which can realize the heat energy recovery of steam condensate water and has the advantage of high energy utilization rate.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A steam condensate recovery and reuse system comprises a steam condensate recovery mechanism, a heat exchange mechanism, a preheating mechanism and a normal temperature water recovery mechanism, wherein the input end of the steam condensate recovery mechanism is used for a steam condensate output device, the output end of the steam condensate recovery mechanism is connected to the first input end of the heat exchange mechanism, the first output end of the heat exchange mechanism is connected to the input end of the normal temperature water recovery mechanism, and the output end of the normal temperature water recovery mechanism is used to output normal temperature water; the output end and input end of the preheating mechanism are respectively connected to the second input end and the second output end of the heat exchange mechanism, and the preheating mechanism is used to realize the regeneration air preheating of the rotary dehumidifier.

[0008] In the steam condensate recovery and reuse system, the steam condensate recovery mechanism includes a plurality of steam traps, a condensate recovery pump and an insulated water tank, the input ends of the plurality of steam traps are respectively used to connect to the steam condensate output devices, the output ends of the plurality of steam traps are respectively connected to the input ends of the condensate recovery pumps through condensate recovery pipelines, the output end of the condensate recovery pumps is connected to the input end of the insulated water tank, and the output end of the insulated water tank is connected to the input end of the heat exchange mechanism.

[0009] In the steam condensate recovery and reuse system, the insulated water tank includes an inner wall and an outer wall, the outer wall is provided with an inlet and an outlet, the inlet and the outlet are respectively provided with insulation valves, the condensate recovery pump and the heat exchange mechanism are respectively connected to the insulation valves; an insulation layer is formed between the outer wall and the inner wall, and the insulation layer is filled with high-density insulation material; the inner side surface of the inner wall is coated with reflective material.

[0010] In the steam condensate water recovery and reuse system, the heat exchange mechanism includes a hot water delivery pump, a preheating circulation pump and a plate heat exchanger; the output end of the steam condensate water recovery mechanism is connected to the input end of the hot water delivery pump, the output end of the hot water delivery pump is connected to the first input end of the plate heat exchanger, the first output end of the plate heat exchanger is connected to the input end of the normal temperature water recovery mechanism; the second output end of the plate heat exchanger is connected to the input end of the preheating mechanism through the preheating circulation pump, and the output end of the preheating mechanism is connected to the second input end of the plate heat exchanger.

[0011] The steam condensate recovery and reuse system also includes a control device. A first temperature sensor is provided on the connecting pipeline between the output end of the preheating mechanism and the second input end of the plate heat exchanger. The first temperature sensor, the preheating circulation pump and the hot water delivery pump are electrically connected to the control device respectively.

[0012] In the steam condensate recovery and reuse system, a second temperature sensor is provided on the connecting pipeline between the first output end of the plate heat exchanger and the input end of the normal temperature water recovery mechanism, and the second temperature sensor is electrically connected to the control device.

[0013] In the steam condensate recovery and reuse system, the preheating mechanism includes a preheating device, a fresh air pipeline and a rotary dehumidifier, the water outlet and the water inlet of the preheating device are respectively connected to the second input end and the second output end of the heat exchange mechanism; the preheating device is provided with an air inlet and an air outlet, the air inlet is used to input regeneration air, and the air outlet is connected to the regeneration air outlet of the rotary dehumidifier through the fresh air pipeline.

[0014] In the steam condensate recovery and reuse system, the preheating device is provided with a fan, a filter and at least two preheating heat exchangers, at least two of the preheating heat exchangers are connected in series through a heat source connecting pipe, the heat source input end of the preheating heat exchanger adjacent to the air inlet of the preheating device is connected to the water inlet, and the heat source output end of the preheating heat exchanger adjacent to the air outlet of the preheating device is connected to the water outlet; the filter, at least two preheating heat exchangers and the fan are arranged in sequence along the air inlet and outlet directions of the preheating device.

[0015] In the steam condensate recovery and reuse system, a plurality of serpentine coils are arranged in the preheating heat exchanger, and adjacent serpentine coils are connected in series; the input end of any serpentine coil is connected to the heat source input end of the preheating heat exchanger, and the output end of any serpentine coil is connected to the heat source output end of the preheating heat exchanger; the air inlet side and the air outlet side of the preheating heat exchanger are respectively provided with air balancing plates, and a plurality of air balancing holes are opened on the air balancing plates.

[0016] In the steam condensate water recovery and reuse system, the normal temperature water recovery mechanism includes a normal temperature water tank and a water make-up pump, the input end of the normal temperature water tank is connected to the first output end of the heat exchange mechanism, the output end of the normal temperature water tank is connected to the water make-up pump, and the output end of the water make-up pump is used to output normal temperature water to water-demanding equipment.

[0017] Beneficial effects:

[0018] The present invention provides a steam condensate recovery and reuse system. Through the cooperation of a heat exchange mechanism and a preheating mechanism, the heat of the steam condensate can be recovered and used for preheating the regeneration air of a rotary dehumidifier, so as to realize heat energy recovery of the steam condensate, save the steam consumption of the rotary dehumidifier, and have the advantage of high energy utilization rate; and there is no need to additionally set up a cooling tower to cool the steam condensate, thus saving additional electricity consumption; further, the heat exchange mechanism can recover the heat of the steam condensate above 90°C to normal temperature level, and the normal temperature water recovery mechanism transports the normal temperature water output by the heat exchange mechanism to water-demanding equipment, so as to realize water replenishment of other process systems, thereby realizing the recycling of water resources and further improving energy utilization rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A system structure diagram of the steam condensate recovery and reuse system provided by the present invention;

[0020] Figure 2 This is a schematic diagram of the internal structure of the preheating device provided by the present invention.

[0021] Explanation of main component symbols: 11-trap, 12-condensate recovery pump, 13-insulated water tank, 21-hot water delivery pump, 22-preheating circulation pump, 23-plate heat exchanger, 24-first temperature sensor, 25-second temperature sensor, 31-preheating device, 311-fan, 312-preheating heat exchanger, 313-filter, 32-fresh air pipeline, 33-rotary dehumidifier, 41-normal temperature water tank, 42-water supply pump. DETAILED DESCRIPTION

[0022] The present invention provides a steam condensate recovery and reuse system. In order to make the purpose, technical solution and effect of the present invention clearer and more specific, the present invention is further described in detail below with reference to the accompanying drawings and examples.

[0023] In the description of the present invention, it should be understood that the terms "installation", "connection" and the like should be understood in a broad sense, and a person skilled in the art can understand the specific meanings of the above terms in the present invention according to specific circumstances.

[0024] See also Figure 1 and Figure 2 The present invention provides a steam condensate recovery and reuse system, comprising a steam condensate recovery mechanism, a heat exchange mechanism, a preheating mechanism and a normal temperature water recovery mechanism, wherein the input end of the steam condensate recovery mechanism is used for a steam condensate output device, the output end of the steam condensate recovery mechanism is connected to the first input end of the heat exchange mechanism, the first output end of the heat exchange mechanism is connected to the input end of the normal temperature water recovery mechanism, and the output end of the normal temperature water recovery mechanism is used to output normal temperature water; the output end and input end of the preheating mechanism are respectively connected to the second input end and the second output end of the heat exchange mechanism, and the preheating mechanism is used to realize the regeneration air preheating of the rotary dehumidifier 33.

[0025] The present application discloses a steam condensate recovery and reuse system. Through the cooperation of a heat exchange mechanism and a preheating mechanism, the heat of the steam condensate can be recovered and used for preheating the regeneration air of the rotary dehumidifier, so as to realize the heat energy recovery of the steam condensate, save the steam consumption of the rotary dehumidifier 33, and have the advantage of high energy utilization rate; and there is no need to set up an additional cooling tower to cool the steam condensate, saving additional electricity consumption; further, the heat exchange mechanism can recover the heat of the steam condensate above 90°C to the normal temperature level, and the normal temperature water recovery mechanism transports the normal temperature water output by the heat exchange mechanism to the water-requiring equipment to realize the water replenishment 42 of other process systems, thereby realizing the recycling of water resources and further improving the energy utilization rate.

[0026] For further information, see Figure 1The steam condensate recovery mechanism includes a plurality of steam traps: 11, a condensate recovery pump 12 and an insulated water tank 13. The input ends of the plurality of steam traps: 11 are respectively used to connect to the steam condensate output device, and the output ends of the plurality of steam traps: 11 are respectively connected to the input end of the condensate recovery pump 12 through a condensate recovery pipeline, the output end of the condensate recovery pump 12 is connected to the input end of the insulated water tank 13, and the output end of the insulated water tank 13 is connected to the input end of the heat exchange mechanism.

[0027] In this embodiment, the steam condensate output device can be a tunnel furnace, an air-conditioning cabinet, a distillation device, a rotary dehumidifier 33, etc.; a steam trap is set at the output end of the steam condensate output device: 11, which is a device for automatically removing condensate from the steam system or the condensate system, and at the same time preventing steam from escaping, so as to improve the thermal efficiency and the operating efficiency of the equipment.

[0028] In this embodiment, the volume of the thermal insulation water tank 13 can be designed according to actual needs.

[0029] Furthermore, the insulated water tank 13 includes an inner wall and an outer wall, the outer wall is provided with an inlet and an outlet, the inlet and the outlet are respectively provided with insulation valves, the condensate recovery pump 12 and the heat exchange mechanism are respectively connected to the insulation valves; an insulation layer is formed between the outer wall and the inner wall, and the insulation layer is filled with high-density insulation material; the inner side surface of the inner wall is coated with reflective material.

[0030] In this embodiment, the high-density thermal insulation material is high-density polyethylene, polyurethane foam, rock wool or glass wool, etc., and the reflective material can be aluminum foil or a special coating for reflecting heat radiation; by forming an insulation layer between the outer wall and the inner wall and filling it with high-density thermal insulation material, heat loss can be effectively reduced, thereby maintaining the water temperature in the thermal insulation water tank 13 stable and reducing unnecessary heat energy loss; by arranging thermal insulation valves at the inlet and outlet respectively, it is ensured that heat loss is minimized during the operation of the thermal insulation water tank 13, and it is convenient for maintenance and inspection; by coating the inner side of the inner wall with reflective material, heat radiation can be reflected, the thermal insulation effect is further enhanced, and heat loss is reduced; that is, by combining the thermal insulation material with the thermal insulation valve and the reflective material, the thermal insulation effect of the thermal insulation water tank 13 on steam condensate water can be ensured to ensure the full recovery and utilization of heat energy.

[0031] For further information, see Figure 1The heat exchange mechanism includes a hot water delivery pump 21, a preheating circulation pump 22 and a plate heat exchanger 23. The output end of the steam condensate water recovery mechanism is connected to the input end of the hot water delivery pump 21, the output end of the hot water delivery pump 21 is connected to the first input end of the plate heat exchanger 23, the first output end of the plate heat exchanger 23 is connected to the input end of the normal temperature water recovery mechanism; the second output end of the plate heat exchanger 23 is connected to the input end of the preheating mechanism through the preheating circulation pump 22, and the output end of the preheating mechanism is connected to the second input end of the plate heat exchanger 23.

[0032] For further information, see Figure 1 The steam condensate recovery and reuse system also includes a control device. A first temperature sensor 24 is provided on the connecting pipeline between the output end of the preheating mechanism and the second input end of the plate heat exchanger 23. The first temperature sensor 24, the preheating circulation pump 22 and the hot water delivery pump 21 are electrically connected to the control device respectively.

[0033] In this embodiment, the control device can obtain the real-time outdoor temperature. The control device uses a PID algorithm to adjust the working state of the preheating circulation pump 22 based on the comparison result of the real-time return water temperature of the plate heat exchanger 23 fed back by the first temperature sensor 24 and the preset outdoor temperature suitable range, so as to ensure that the real-time return water temperature of the second input end of the plate heat exchanger 23 is close to the outdoor temperature level.

[0034] For further information, see Figure 1 A second temperature sensor 25 is provided on the connecting pipeline between the first output end of the plate heat exchanger 23 and the input end of the normal temperature water recovery mechanism, and the second temperature sensor 25 is electrically connected to the control device.

[0035] In this embodiment, the control device can obtain the real-time outdoor temperature. The control device uses a PID algorithm to adjust the working state of the hot water delivery pump 21 based on the real-time water outlet temperature of the first output end of the plate heat exchanger 23 fed back by the second temperature sensor 25 and the comparison effect of the outdoor air temperature to ensure that the real-time water outlet temperature of the steam condensate after heat exchange in the plate heat exchanger 23 is close to the outdoor air temperature level.

[0036] For further information, see Figure 1 The preheating mechanism includes a preheating device 31, a fresh air pipeline 32 and a rotary dehumidifier 33. The water outlet and the water inlet of the preheating device 31 are respectively connected to the second input end and the second output end of the heat exchange mechanism; the preheating device 31 is provided with an air inlet and an air outlet, the air inlet is used to input regeneration air, and the air outlet is connected to the regeneration air outlet of the rotary dehumidifier 33 through the fresh air pipeline 32.

[0037] For further information, see Figure 2 The preheating device 31 is provided with a fan 311, a filter 313 and at least two preheating heat exchangers 312. At least two of the preheating heat exchangers 312 are connected in series through a heat source connecting pipe. The heat source input end of the preheating heat exchanger 312 adjacent to the air inlet of the preheating device 31 is connected to the water inlet, and the heat source output end of the preheating heat exchanger 312 adjacent to the air outlet of the preheating device 31 is connected to the water outlet; the filter 313, at least two of the preheating heat exchangers 312 and the fan 311 are arranged in sequence along the air inlet and outlet directions of the preheating device 31.

[0038] In this embodiment, the preheating device 31 has a high-efficiency heat exchange capability. By providing a fan 311, a filter 313 and at least two preheating heat exchangers 312, the preheating device 31 can realize continuous heat energy transfer; the preheating heat exchangers 312 are connected in series through a heat source connecting pipe, ensuring the effective utilization of the heat source and the gradual transfer of heat, and the preheating heat exchangers 312 are arranged in sequence along the air inlet and outlet directions of the preheating device 31, which helps to form an orderly heat flow path and further improve the heat exchange efficiency; further, the filter 313 can remove impurities and particles in the air entering the preheating device 31 to protect the preheating heat exchanger 312 from contamination, and ensure the normal operation of the fan 311 and the overall heat exchange efficiency of the preheating device 31.

[0039] Furthermore, a plurality of serpentine coils are arranged in the preheating heat exchanger 312, and adjacent serpentine coils are connected in series; the input end of any of the serpentine coils is connected to the heat source input end of the preheating heat exchanger 312, and the output end of any of the serpentine coils is connected to the heat source output end of the preheating heat exchanger 312; and air equalizing plates are respectively arranged on the air inlet side and the air outlet side of the preheating heat exchanger 312, and a plurality of air equalizing holes are opened on the air equalizing plates.

[0040] In this embodiment, the preheating heat exchanger 312 has efficient heat exchange performance and uniform airflow distribution; by setting up a plurality of serpentine coils and connecting adjacent serpentine coils in series, the heat exchange area can be increased and the efficiency of heat energy absorption and release can be improved; further, the air inlet side and the air outlet side of the preheating heat exchanger 312 are provided with an air balancing plate, and the plurality of air balancing holes opened on the air balancing plate help to achieve uniform distribution of airflow, thereby improving heat exchange efficiency and ensuring temperature uniformity.

[0041] For further information, see Figure 1The normal temperature water recovery mechanism includes a normal temperature water tank 41 and a water replenishment pump 42, and the water replenishment pump 42 is electrically connected to the control device; the input end of the normal temperature water tank 41 is connected to the first output end of the heat exchange mechanism, and the output end of the normal temperature water tank 41 is connected to the water replenishment pump 42, and the output end of the water replenishment pump 42 is used to output normal temperature water to the water-demanding equipment.

[0042] In this embodiment, the water-requiring equipment may be a cooling tower, and the capacity of the normal temperature water tank 41 may be designed according to actual needs.

[0043] For example, the working mode of the steam condensate recovery and reuse system disclosed in this application is:

[0044] When the steam condensate output device is running, the condensate recovery pump 12 is turned on to continuously deliver the high-temperature condensate to the insulation water tank 13 for storage. The condensate temperature T1 here is above 90°C, and in this example, it is assumed to be 95°C.

[0045] When the rotary dehumidifier 33 is running, the hot water delivery pump 21 and the circulating hot water pump are turned on, and the heat exchange mechanism and the preheating mechanism are started. The steam condensed water with a temperature of T1 in the insulation water tank 13 is fully heat-exchanged with the circulating water on the secondary side on the primary side. The hot water T2 obtained on the secondary side is delivered to the preheating device 31 to preheat the regeneration air of the rotary dehumidifier 33. The normal temperature water T3 cooled by the regeneration air is continuously delivered back to the plate heat exchanger 23 for circulating heat exchange. The normal temperature water T4 cooled on the secondary side is delivered to the normal temperature water tank 41 for storage.

[0046] When the cooling tower equipment is running, the normal temperature water delivery system is turned on to replenish water 42 for the cooling tower equipment, thereby realizing the recycling of water resources; the normal temperature water tank 41 can be designed with a volume according to the daily water consumption requirement. When the water in the normal temperature water tank 41 reaches the preset maximum water level and the cooling tower equipment stops running, the excess normal temperature water can be used in the grey water system or directly discharged.

[0047] The inlet and outlet temperature differences of the cold fluid and the hot fluid of the plate heat exchanger 23 in the steam condensation recovery and reuse system disclosed in the present application are designed to be 1°C, that is, according to the 1°C temperature difference, the temperature T2 is 1°C lower than T1, that is, T2=T1-1, which is 94°C; assuming the outdoor temperature range of the area in this example, that is, the temperature at the fresh air inlet T5 is 5°C-30°C, that is, the corresponding cold water outlet T3 of the secondary side preheating device 31 fluctuates in the range of 15°C-31°C throughout the year, and the corresponding primary side normal temperature water outlet temperature T5 fluctuates in the range of 16°C-32°C; the preheating device 31 of the present application aims at a supply air temperature of 80°C after fresh air preheating, and the specific design of the preheating device 31 needs to be designed according to the most unfavorable temperature conditions in the specific area; according to the law of conservation of energy, the preheating mechanism disclosed in the present application has a supply air temperature of >80°C after fresh air preheating throughout the year.

[0048] The advantages of the steam condensate water recovery and reuse system disclosed in the present application are: no matter how the outdoor temperature changes, the system can utilize high-temperature condensate water above 90°C to room temperature, thereby realizing complete recovery and utilization of heat energy; the water resources recovered by the system are room temperature water after steam condensation, which can be directly recovered and used in water-requiring equipment such as cooling towers, thereby realizing the recovery and utilization of water resources and saving the cooling energy consumption of cooling towers; for the lithium battery and electronics industries, their rotary dehumidifiers 33 often need to operate uninterruptedly for 24 hours, and the heat energy required for the regeneration wind is much greater than the heat of steam condensation, so the system can achieve continuous operation in terms of heat recovery time and complete recovery and utilization of the total amount of heat energy; the system can save investment in additional equipment such as cooling towers, and reduce the energy consumption of the condensate water discharge system, which is in line with the environmental protection concept of energy saving and consumption reduction.

[0049] It is understandable that those skilled in the art can make equivalent substitutions or changes based on the technical solution and inventive concept of the present invention, and all these changes or substitutions should fall within the protection scope of the present invention.

Claims

1. A steam condensate recycling system, characterized in that: It includes a steam condensate recovery mechanism, a heat exchange mechanism, a preheating mechanism and a normal temperature water recovery mechanism. The input end of the steam condensate recovery mechanism is used for a steam condensate output device, the output end of the steam condensate recovery mechanism is connected to the first input end of the heat exchange mechanism, the first output end of the heat exchange mechanism is connected to the input end of the normal temperature water recovery mechanism, and the output end of the normal temperature water recovery mechanism is used to output normal temperature water; the output end and input end of the preheating mechanism are respectively connected to the second input end and the second output end of the heat exchange mechanism, and the preheating mechanism is used to realize the regeneration air preheating of the rotary dehumidifier.

2. A steam condensate recycling system according to claim 1, characterized in that: The steam condensate recovery mechanism includes a plurality of steam traps, a condensate recovery pump and an insulated water tank. The input ends of the plurality of steam traps are respectively used to connect to the steam condensate output devices, the output ends of the plurality of steam traps are respectively connected to the input ends of the condensate recovery pumps through condensate recovery pipelines, the output end of the condensate recovery pumps is connected to the input end of the insulated water tank, and the output end of the insulated water tank is connected to the input end of the heat exchange mechanism.

3. A steam condensate recycling system according to claim 2, characterized in that: The insulated water tank includes an inner wall and an outer wall, the outer wall is provided with an inlet and an outlet, the inlet and the outlet are respectively provided with insulation valves, the condensate recovery pump and the heat exchange mechanism are respectively connected to the insulation valves; an insulation layer is formed between the outer wall and the inner wall, and the insulation layer is filled with high-density insulation material; the inner side surface of the inner wall is coated with reflective material.

4. The steam condensate recycling system according to claim 2, characterized in that: The heat exchange mechanism includes a hot water delivery pump, a preheating circulation pump and a plate heat exchanger. The output end of the steam condensate water recovery mechanism is connected to the input end of the hot water delivery pump, the output end of the hot water delivery pump is connected to the first input end of the plate heat exchanger, and the first output end of the plate heat exchanger is connected to the input end of the normal temperature water recovery mechanism; the second output end of the plate heat exchanger is connected to the input end of the preheating mechanism through the preheating circulation pump, and the output end of the preheating mechanism is connected to the second input end of the plate heat exchanger.

5. A steam condensate recycling system according to claim 4, characterized in that: It also includes a control device. A first temperature sensor is provided on the connecting pipeline between the output end of the preheating mechanism and the second input end of the plate heat exchanger. The first temperature sensor, the preheating circulation pump and the hot water delivery pump are electrically connected to the control device respectively.

6. A steam condensate recycling system according to claim 5, characterized in that: A second temperature sensor is provided on the connecting pipeline between the first output end of the plate heat exchanger and the input end of the normal temperature water recovery mechanism, and the second temperature sensor is electrically connected to the control device.

7. The steam condensate recycling system according to claim 1, characterized in that: The preheating mechanism includes a preheating device, a fresh air pipeline and a rotary dehumidifier. The water outlet and the water inlet of the preheating device are respectively connected to the second input end and the second output end of the heat exchange mechanism; the preheating device is provided with an air inlet and an air outlet, the air inlet is used to input regeneration air, and the air outlet is connected to the regeneration air outlet of the rotary dehumidifier through the fresh air pipeline.

8. The steam condensate recycling system according to claim 7, characterized in that: The preheating device is provided with a fan, a filter and at least two preheating heat exchangers. The at least two preheating heat exchangers are connected in series through a heat source connecting pipe. The heat source input end of the preheating heat exchanger adjacent to the air inlet of the preheating device is connected to the water inlet, and the heat source output end of the preheating heat exchanger adjacent to the air outlet of the preheating device is connected to the water outlet; the filter, at least two preheating heat exchangers and the fan are arranged in sequence along the air inlet and outlet directions of the preheating device.

9. The steam condensate recycling system according to claim 8, characterized in that: A plurality of serpentine coils are arranged in the preheating heat exchanger, and adjacent serpentine coils are connected in series; the input end of any serpentine coil is connected to the heat source input end of the preheating heat exchanger, and the output end of any serpentine coil is connected to the heat source output end of the preheating heat exchanger; an air equalizing plate is respectively arranged on the air inlet side and the air outlet side of the preheating heat exchanger, and a plurality of air equalizing holes are opened on the air equalizing plate.

10. The steam condensate recycling system according to claim 1, characterized in that: The normal temperature water recovery mechanism includes a normal temperature water tank and a water replenishment pump, the input end of the normal temperature water tank is connected to the first output end of the heat exchange mechanism, the output end of the normal temperature water tank is connected to the water replenishment pump, and the output end of the water replenishment pump is used to output normal temperature water to water-demanding equipment.

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