Steam condensate recovery system

Abstract

The invention discloses a steam condensate recovery system which comprises a steam condensate recovery mechanism, a heat energy recovery mechanism and a preheating mechanism, and the heat energy recovery mechanism comprises a refrigeration part and a heat exchange part; the output end of the steam condensate recovery mechanism is connected with the first input end of the refrigeration part, the first output end of the refrigeration part is connected with the first input end of the heat exchange part, and 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 part respectively. The preheating mechanism is used for preheating regenerated air of the rotary dehumidifier, and the refrigerating part is used for generating cooling capacity; according to the steam condensate water recovery system, heat of steam condensate water can be collected, certain cooling capacity is generated through the refrigeration part and used for cooling of the cooling equipment, and the collected heat is used for preheating regenerated air of the rotary dehumidifier through the heat exchange part, so that heat energy is recycled, the steam consumption of the rotary dehumidifier is reduced, and the energy consumption of the rotary dehumidifier is reduced. And the energy utilization rate is improved.

Description

Technical Field

[0001] The invention relates to the technical field of energy recovery, and in particular to a steam condensate water recovery 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 raises 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 reused; on the other hand, the cooling process itself consumes a large amount of high-grade electricity, which increases production costs.

[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 recovery system which can recover the heat of steam condensate for use in refrigeration of the refrigeration unit and regeneration air preheating of the preheating mechanism, and has the advantage of high energy utilization.

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

[0007] A steam condensate recovery system comprises a steam condensate recovery mechanism, a heat energy recovery mechanism and a preheating mechanism, wherein the heat energy recovery mechanism comprises a refrigeration unit and a heat exchange unit; an input end of the steam condensate recovery mechanism is used for a steam condensate output device, an output end of the steam condensate recovery mechanism is connected to a first input end of the refrigeration unit, the first output end of the refrigeration unit is connected to a first input end of the heat exchange unit, the output end and input end of the preheating mechanism are respectively connected to a second input end and a second output end of the heat exchange unit, the preheating mechanism is used to realize regeneration air preheating of a rotary dehumidifier, and the refrigeration unit is used to generate cooling capacity.

[0008] In the steam condensate recovery 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 refrigeration unit.

[0009] In the steam condensate recovery system, the refrigeration part includes a hot water delivery pump and a cold absorption refrigeration unit, the first input end of the cold absorption refrigeration unit is connected to the output end of the steam condensate recovery mechanism through the hot water delivery pump, and the first output end of the cold absorption refrigeration unit is connected to the first input end of the heat exchange part; the second input end and the second output end of the cold absorption refrigeration unit are respectively used to connect to cold equipment.

[0010] In the steam condensate recovery system, the heat exchange part includes a preheating circulation pump and a plate heat exchanger, the first output end of the absorption refrigeration unit is connected to the first input end of the plate heat exchanger, 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 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 water recovery 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 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 part; 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 system, a fan, a filter and at least two preheating heat exchangers are provided in the preheating device, 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] The steam condensate water recovery system further includes a normal temperature water recovery mechanism, the first output end of the heat exchange unit 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.

[0016] In the steam condensate water recovery 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 part, 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 the water-demanding equipment.

[0017] Beneficial effects:

[0018] The present invention provides a steam condensate recovery system, which collects the heat of steam condensate through a steam condensate recovery mechanism, and then generates a certain amount of cold through a refrigeration unit for cooling of cooling equipment, and uses the collected heat for preheating the regeneration air of a rotary dehumidifier through a heat exchange unit, so as to realize the recovery and utilization of the thermal energy of the steam condensate, save the steam consumption of the rotary dehumidifier, and has 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A system structure diagram of the steam condensate recovery 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-absorption refrigeration unit, 23-preheating circulation pump, 24-plate heat exchanger, 25-first temperature sensor, 26-second temperature sensor, 31-preheating device, 311-fan, 312-preheating heat exchanger, 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 system. 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 system, including a steam condensate recovery mechanism, a heat energy recovery mechanism and a preheating mechanism, wherein the heat energy recovery mechanism includes a refrigeration part and a heat exchange part; 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 refrigeration part, the first output end of the refrigeration part is connected to the first input end of the heat exchange part, 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 part, the preheating mechanism is used to realize the regeneration air preheating of the rotary dehumidifier 33, and the refrigeration part is used to generate cold.

[0025] The present application discloses a steam condensate recovery system, which collects the heat of steam condensate through a steam condensate recovery mechanism, and then generates a certain amount of cold through a refrigeration unit for cooling of cooling equipment, and uses the collected heat for regeneration air preheating of a rotary dehumidifier 33 through a heat exchange unit, so as to realize the recovery and utilization of the thermal energy of the steam condensate, save the steam consumption of the rotary dehumidifier 33, and has 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.

[0026] For further information, see Figure 1 The 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 devices, and the output ends of the plurality of steam traps 11 are respectively connected to the input ends of the condensate recovery pumps 12 through condensate recovery pipelines. 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 refrigeration unit.

[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 11 is arranged at the output end of the steam condensate output device, which is used to automatically remove condensate from the steam system or the condensate system, and prevent 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] In this embodiment, 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 1 The refrigeration unit includes a hot water delivery pump 21 and a cold absorption refrigeration unit 22. The first input end of the cold absorption refrigeration unit 22 is connected to the output end of the steam condensate recovery mechanism through the hot water delivery pump 21, and the first output end of the cold absorption refrigeration unit 22 is connected to the first input end of the heat exchange unit; the second input end and the second output end of the cold absorption refrigeration unit 22 are respectively used to connect to the cold equipment.

[0032] In this embodiment, the absorption-type refrigeration unit 22 is an absorption-type lithium bromide refrigeration unit; the absorption-type lithium bromide refrigeration unit is a refrigeration equipment driven by thermal energy, which achieves the refrigeration effect by absorbing water vapor through lithium bromide solution; this unit is usually used in the central air-conditioning system of large buildings, and provides heat sources through steam, hot water or burning natural gas; the lithium bromide unit has the characteristics of environmental protection and energy saving, and is particularly suitable for those areas with tight electricity supply or high electricity prices; that is, the absorption-type refrigeration unit 22 disclosed in the present application drives the refrigeration unit to operate by recovering the waste heat of steam condensed water, and generates cold for use by cold equipment, and the cold equipment can be an air conditioner.

[0033] For further information, see Figure 1 The heat exchange part includes a preheating circulation pump 23 and a plate heat exchanger 24. The first output end of the absorption refrigeration unit 22 is connected to the first input end of the plate heat exchanger 24. The second output end of the plate heat exchanger 24 is connected to the input end of the preheating mechanism through the preheating circulation pump 23. The output end of the preheating mechanism is connected to the second input end of the plate heat exchanger 24.

[0034] For further information, see Figure 1 The steam condensate recovery system also includes a control device. A first temperature sensor 25 is provided on the connecting pipeline between the output end of the preheating mechanism and the second input end of the plate heat exchanger 24. The first temperature sensor 25, the preheating circulation pump 23 and the hot water delivery pump 21 are electrically connected to the control device respectively.

[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 preheating circulation pump 23 based on the comparison result of the real-time return water temperature of the plate heat exchanger 24 fed back by the first temperature sensor 25 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 24 is close to the outdoor temperature level.

[0036] For further information, see Figure 1 A second temperature sensor 26 is provided on the connecting pipeline between the first output end of the plate heat exchanger 24 and the input end of the normal temperature water recovery mechanism, and the second temperature sensor 26 is electrically connected to the control device.

[0037] 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 24 fed back by the second temperature sensor 26 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 24 is close to the outdoor air temperature level.

[0038] For further information, see Figure 1 and Figure 2 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 part; 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.

[0039] For further information, see Figure 2The 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.

[0040] 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 efficiency of the preheating device 31.

[0041] 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.

[0042] 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.

[0043] For further information, see Figure 1 The steam condensate water recovery system also includes a normal temperature water recovery mechanism, the first output end of the heat exchange unit 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.

[0044] In this embodiment, by providing a normal temperature water mechanism, the normal temperature water cooled by the plate heat exchanger 24 can be delivered to the water-requiring equipment to replenish water for other process systems, thereby realizing the recycling of water resources and further improving energy utilization.

[0045] For further information, see Figure 1 The normal temperature water recovery mechanism includes a normal temperature water tank 41 and a water replenishment pump 42. The input end of the normal temperature water tank 41 is connected to the first output end of the heat exchange unit, and the output end of the normal temperature water tank 41 is connected to the water replenishment pump 42. The output end of the water replenishment pump 42 is used to output normal temperature water to the water-demanding equipment.

[0046] 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.

[0047] For example, the working mode of the steam condensate recovery system disclosed in this application is:

[0048] When the steam condensate output device is running, the condensate recovery pump 12 is turned on to continuously deliver the high-temperature steam 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.

[0049] When the rotary dehumidifier 33 is running, the hot water delivery pump 21 and the preheating circulation pump 23 are turned on, and the absorption refrigeration unit 22 is controlled to start working. At this time, for the absorption refrigeration unit 22, its primary side delivers the steam condensate with a temperature of T1 in the insulation water tank 13 to the absorption refrigeration unit, and the heat source side of the refrigeration unit cools the condensate to T2, and its secondary side cools the chilled return water with an inlet temperature of T4 in the chilled water circulation pipeline to T3;

[0050] The condensed water cooled to T2 by the absorption refrigeration unit 22 is then transported to the plate heat exchanger 24 for the next step of sufficient heat exchange. The hot water T5 obtained on the secondary side is transported to the preheating device 31 for preheating the regeneration air of the rotary dehumidifier 33. The normal temperature water T6 cooled by the regeneration air is further transported to the plate heat exchanger 24 for circulating heat exchange. The normal temperature water T7 cooled on the primary side is transported to the normal temperature water tank 41 for storage.

[0051] When the cooling tower equipment is running, the normal temperature water delivery system is turned on to replenish water 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.

[0052] The heat source inlet and outlet temperatures of the absorption refrigeration unit 22 in the steam condensate recovery system disclosed in the present application are designed to be 95°C and 75°C respectively, that is, T1=95°C, T2=75°C; the inlet and outlet temperature differences of the cold fluid and the hot fluid of the plate heat exchanger 24 are designed to be 1°C, that is, according to the 1°C temperature difference, the temperature T5 is 1°C lower than T2, that is, T5=T2-1, which is 74°C; assuming that the outdoor temperature T8 in the area of ​​this example fluctuates within a range of 5°C-30°C throughout the year, the corresponding cold water outlet T6 of the secondary side preheating device 31 fluctuates within a range of 15°C-31°C throughout the year, and the corresponding primary side normal temperature water outlet temperature T7 fluctuates within a range of 16°C-32°C; the preheating device 31 of the present application targets a supply air temperature of 60°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 supply air temperature range of the preheating mechanism disclosed in the present application after fresh air preheating is >60°C throughout the year.

[0053] The advantage of the steam condensate recovery system disclosed in the present application is that no matter how the outdoor temperature changes, the system can utilize high-temperature condensate above 90°C to room temperature, thereby realizing complete recovery of thermal energy, and the heat and cold generated in the recovery process can be fully utilized for the regeneration of the rotary dehumidifier 33 and the refrigeration of other refrigeration equipment, which has great energy saving and economic value; the water resources recovered by the system are room temperature water after steam condensation, which can be directly recycled for water-requiring equipment such as cooling towers, thereby realizing the recovery of water resources; for the lithium battery and electronics industries, the rotary dehumidifier 33 often needs to run 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 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 discharge system, which is in line with the environmental protection concept of energy saving and consumption reduction.

[0054] 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 recovery system, characterized in that: It includes a steam condensate recovery mechanism, a heat energy recovery mechanism and a preheating mechanism, wherein the heat energy recovery mechanism includes a refrigeration part and a heat exchange part; 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 refrigeration part, the first output end of the refrigeration part is connected to the first input end of the heat exchange part, 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 part, the preheating mechanism is used to realize the regeneration air preheating of the rotary dehumidifier, and the refrigeration part is used to generate cold.

2. A steam condensate recovery 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, and 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 pump 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 refrigeration unit.

3. A steam condensate recovery system according to claim 2, characterized in that: The refrigeration unit includes a hot water delivery pump and a cold absorption refrigeration unit. The first input end of the cold absorption refrigeration unit is connected to the output end of the steam condensate water recovery mechanism through the hot water delivery pump, and the first output end of the cold absorption refrigeration unit is connected to the first input end of the heat exchange unit; the second input end and the second output end of the cold absorption refrigeration unit are respectively used to connect to cold equipment.

4. A steam condensate recovery system according to claim 3, characterized in that: The heat exchange part includes a preheating circulation pump and a plate heat exchanger. The first output end of the absorption refrigeration unit is connected to the first input end of the plate heat exchanger. The second output end of the plate heat exchanger is connected to the input end of the preheating mechanism through the preheating circulation pump. The output end of the preheating mechanism is connected to the second input end of the plate heat exchanger.

5. A steam condensate recovery 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 recovery 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 recovery 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 part; 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. A steam condensate recovery 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 recovery system according to claim 1, characterized in that: It also includes a normal temperature water recovery mechanism. The first output end of the heat exchange part is connected to the input end of the normal temperature water recovery mechanism. The output end of the normal temperature water recovery mechanism is used to output normal temperature water.

10. A steam condensate recovery system according to claim 9, 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 part, 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 the water-demanding equipment.

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