Energy cascade recovery system

Abstract

The invention discloses an energy cascade recovery system which comprises a steam condensate recovery mechanism, a medium-temperature water recovery mechanism, a high-temperature heat utilization mechanism and a normal-temperature water recovery mechanism. The output end of the steam condensate recovery mechanism is connected with the input end of the medium-temperature water recovery mechanism and the first input end of the high-temperature heat utilization mechanism, and the first output end of the high-temperature heat utilization mechanism is connected with the input end of the normal-temperature water recovery mechanism. The output end of the normal-temperature water recycling mechanism is used for outputting normal-temperature water; the high-temperature heat utilization mechanism is used for preheating regenerated air of the rotary dehumidifier; according to the energy cascade recovery system, through cooperation of the medium-temperature water recovery mechanism, the high-temperature heat utilization mechanism and the normal-temperature water recovery mechanism, cascade recovery of steam condensate water heat can be achieved, water sources which are different in temperature and can be used for different scenes are generated, and the energy utilization rate is high.

Description

Technical Field

[0001] The invention relates to the technical field of energy recovery, and in particular to an energy cascade 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 causes new resource and environmental problems: specifically, a large amount of heat energy is lost to the environment in this process, and the cascade recovery and utilization of heat energy cannot be achieved, and the treated water resources are often directly discharged, failing to achieve the recycling of water resources, 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, the object of the present invention is to provide an energy cascade recovery system that can realize the cascade recovery of steam condensate heat to generate water sources of different temperatures that can be used in different scenarios, 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] An energy cascade recovery system includes a steam condensate recovery mechanism, a medium-temperature water recovery mechanism, a high-temperature heat utilization 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 respectively connected to the input end of the medium-temperature water recovery mechanism and the first input end of the high-temperature heat utilization mechanism, the first output end of the high-temperature heat utilization 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 high-temperature heat utilization mechanism is used to realize the regeneration air preheating of the rotary dehumidifier.

[0008] In the energy cascade recovery system, the high-temperature heat utilization mechanism includes a heat exchange part and a preheating part. The first input end of the heat exchange part is connected to the output end of the steam condensate water recovery mechanism, and 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 and the input end of the preheating part are respectively connected to the second input end and the second output end of the heat exchange part, and the preheating part is used to realize the regeneration air preheating of the rotary dehumidifier.

[0009] In the energy cascade recovery system, the heat exchange part includes a preheating circulation pump and a first plate heat exchanger, the output end of the steam condensate water recovery mechanism is connected to the first input end of the first plate heat exchanger, and the first output end of the first plate heat exchanger is connected to the input end of the normal temperature water recovery mechanism; the second output end of the first plate heat exchanger is connected to the input end of the preheating part through the preheating circulation pump, and the output end of the preheating part is connected to the second input end of the first plate heat exchanger.

[0010] In the energy cascade recovery system, the preheating part 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.

[0011] In the energy cascade recovery 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.

[0012] The energy cascade recovery system also includes a control device, and the steam condensate recovery mechanism includes a plurality of steam traps, a condensate recovery pump, a first insulated water tank, a hot water delivery pump and a three-way valve; the input ends of the plurality of steam traps are respectively used to connect to the steam condensate output device, and the output ends of the plurality of steam traps are respectively connected to the input end of the condensate recovery pump through a condensate recovery pipeline, the output end of the condensate recovery pump is connected to the input end of the first insulated water tank, the output end of the first insulated water tank is connected to the first port of the three-way valve through the hot water delivery pump, the second port and the third port of the three-way valve are respectively connected to the input end of the medium-temperature water recovery mechanism and the first input end of the high-temperature heat utilization mechanism; the hot water delivery pump and the three-way valve are respectively electrically connected to the control device.

[0013] In the energy cascade recovery system, the medium-temperature water recovery mechanism includes a second plate heat exchanger and a second insulated water tank, the second port of the three-way valve is connected to the first input end of the second plate heat exchanger, and the first input end of the second plate heat exchanger is connected to the first input end of the first plate heat exchanger; the second input end of the second plate heat exchanger is used to connect to the water supply pipeline, the second output end of the second plate heat exchanger is connected to the water inlet of the second insulated water tank, and the water outlet of the second insulated water tank is used to connect to the domestic hot water pipeline.

[0014] In the energy cascade recovery system, a first temperature sensor is arranged on the connecting pipeline between the second insulated water tank and the second output end of the second plate heat exchanger, and a liquid level detection device for realizing high water level alarm and low water level alarm is arranged in the second insulated water tank, and the first temperature sensor and the liquid level detection device are electrically connected to the control device respectively.

[0015] In the energy cascade recovery system, a second temperature sensor is provided on the connecting pipeline between the second input end of the first plate heat exchanger and the output end of the preheating device; a third temperature sensor is provided on the connecting pipeline between the first output end of the first plate heat exchanger and the input end of the normal temperature water recovery mechanism, and the third temperature sensor and the second temperature sensor are electrically connected to the control device respectively.

[0016] In the energy cascade 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 high temperature heat utilization 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 the water-demanding equipment.

[0017] Beneficial effects:

[0018] The present invention provides an energy cascade recovery system, which can realize the cascade recovery of heat of steam condensate water through the cooperation of a medium-temperature water recovery mechanism, a high-temperature heat utilization mechanism and a normal-temperature water recovery mechanism, so as to generate water sources of different temperatures that can be used in different scenarios, and can realize the regeneration air preheating 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 water, saving additional electricity consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A system structure diagram of the energy cascade 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-first insulated water tank, 14-hot water delivery pump, 15-three-way valve, 21-preheating circulation pump, 22-first plate heat exchanger, 23-second temperature sensor, 24-preheating device, 241-fan, 242-preheating heat exchanger, 243-filter, 25-fresh air pipeline, 26-rotary dehumidifier, 27-third temperature sensor, 31-second plate heat exchanger, 32-second insulated water tank, 33-first temperature sensor, 41-normal temperature water tank, 42-water make-up pump. DETAILED DESCRIPTION

[0022] The present invention provides an energy cascade 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 an energy cascade recovery system, including a steam condensate recovery mechanism, a medium-temperature water recovery mechanism, a high-temperature heat utilization 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, and the output end of the steam condensate recovery mechanism is respectively connected to the input end of the medium-temperature water recovery mechanism and the first input end of the high-temperature heat utilization mechanism, the first output end of the high-temperature heat utilization 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 high-temperature heat utilization mechanism is used to realize the regeneration air preheating of the rotary dehumidifier 26.

[0025] The present application discloses an energy cascade recovery system, which can realize the cascade recovery of heat of steam condensate water through the cooperation of a medium-temperature water recovery mechanism, a high-temperature heat utilization mechanism and a normal-temperature water recovery mechanism, so as to generate water sources of different temperatures that can be used in different scenarios, thereby realizing the recycling and reuse of water resources and realizing the regeneration air preheating of the rotary dehumidifier 26, with the advantage of high energy utilization rate; and there is no need to set up an additional cooling tower to cool the steam condensate water, saving additional electricity consumption.

[0026] For further information, see Figure 1The high-temperature heat utilization mechanism includes a heat exchange part and a preheating part. The first input end of the heat exchange part is connected to the output end of the steam condensate water recovery mechanism, and 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 and the input end of the preheating part are respectively connected to the second input end and the second output end of the heat exchange part. The preheating part is used to realize the regeneration air preheating of the rotary dehumidifier 26.

[0027] For further information, see Figure 1 The heat exchange part includes a preheating circulation pump 21 and a first plate heat exchanger 22. The output end of the steam condensate water recovery mechanism is connected to the first input end of the first plate heat exchanger 22, and the first output end of the first plate heat exchanger 22 is connected to the input end of the normal temperature water recovery mechanism; the second output end of the first plate heat exchanger 22 is connected to the input end of the preheating part through the preheating circulation pump 21, and the output end of the preheating part is connected to the second input end of the first plate heat exchanger 22.

[0028] For further information, see Figure 1 The preheating part includes a preheating device 24, a fresh air pipeline 25 and a rotary dehumidifier 26, the water outlet and the water inlet of the preheating device 24 are respectively connected to the second input end and the second output end of the heat exchange part; the preheating device 24 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 26 through the fresh air pipeline 25.

[0029] For further information, see Figure 2 The preheating device 24 is provided with a fan 241, a filter 243 and at least two preheating heat exchangers 242. At least two of the preheating heat exchangers 242 are connected in series through a heat source connecting pipe. The heat source input end of the preheating heat exchanger 242 adjacent to the air inlet of the preheating device 24 is connected to the water inlet, and the heat source output end of the preheating heat exchanger 242 adjacent to the air outlet of the preheating device 24 is connected to the water outlet; the filter 243, at least two of the preheating heat exchangers 242 and the fan 241 are arranged in sequence along the air inlet and outlet directions of the preheating device 24.

[0030] In this embodiment, the preheating device 24 has a high-efficiency heat exchange capability. By providing a fan 241, a filter 243 and at least two preheating heat exchangers 242, the preheating device 24 can realize continuous heat energy transfer; the preheating heat exchangers 242 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 242 are arranged in sequence along the air inlet and outlet directions of the preheating device 24, which helps to form an orderly heat flow path and further improve the heat exchange efficiency; further, the filter 243 can remove impurities and particles in the air entering the preheating device 24 to protect the preheating heat exchanger 242 from contamination, and ensure the normal operation of the fan 241 and the overall heat exchange efficiency of the preheating device 24.

[0031] Furthermore, a plurality of serpentine coils are arranged in the preheating heat exchanger 242, 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 242, and the output end of any of the serpentine coils is connected to the heat source output end of the preheating heat exchanger 242; and air equalizing plates are respectively arranged on the air inlet side and the air outlet side of the preheating heat exchanger 242, and a plurality of air equalizing holes are opened on the air equalizing plates.

[0032] In this embodiment, the preheating heat exchanger 242 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 242 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.

[0033] For further information, see Figure 1 The energy cascade recovery system also includes a control device. The steam condensate recovery mechanism includes a plurality of steam traps 11, a condensate recovery pump 12, a first insulated water tank 13, a hot water delivery pump 14 and a three-way valve 15; 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 first insulated water tank 13, the output end of the first insulated water tank 13 is connected to the first port of the three-way valve 15 through the hot water delivery pump 14, and the second port and the third port of the three-way valve 15 are respectively connected to the input end of the medium-temperature water recovery mechanism and the first input end of the high-temperature heat utilization mechanism; the hot water delivery pump 14 and the three-way valve 15 are respectively electrically connected to the control device.

[0034] In this embodiment, the steam condensate output device can be a tunnel furnace, an air-conditioning cabinet, a rectifier, a rotary dehumidifier 26, 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.

[0035] In this embodiment, the volume of the first thermal insulation water tank 13 can be designed according to actual needs.

[0036] Furthermore, the first 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.

[0037] 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 thermal 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 first thermal insulation water tank 13 stable and reducing unnecessary heat energy loss; by arranging insulation valves at the inlet and outlet respectively, it is ensured that heat loss is minimized during the operation of the first thermal insulation water tank 13, and maintenance and inspection are facilitated; by coating the inner side of the inner wall with reflective material, thermal radiation can be reflected, the insulation effect is further enhanced, and heat loss is reduced; that is, by combining the insulation material with the insulation valve and the reflective material, the insulation effect of the first thermal insulation water tank 13 on steam condensate water can be ensured to ensure full recovery and utilization of heat energy.

[0038] For further information, see Figure 1 The medium-temperature water recovery mechanism includes a second plate heat exchanger 31 and a second insulated water tank 32. The second port of the three-way valve 15 is connected to the first input end of the second plate heat exchanger 31, and the first input end of the second plate heat exchanger 31 is connected to the first input end of the first plate heat exchanger 22; the second input end of the second plate heat exchanger 31 is used to connect the water supply pipeline, the second output end of the second plate heat exchanger 31 is connected to the water inlet of the second insulated water tank 32, and the water outlet of the second insulated water tank 32 is used to connect the domestic hot water pipeline.

[0039] In this embodiment, the medium-temperature water stored in the second insulated water tank 32 can be used for domestic hot water, that is, the second insulated water tank 32 is used to connect the domestic hot water pipeline; the volume of the second insulated water tank 32 can be designed according to actual needs, and the structure of the second insulated water tank 32 is consistent with the structure of the first insulated water tank 13.

[0040] For further information, see Figure 1 A first temperature sensor 33 is provided on the connecting pipeline between the second insulated water tank 32 and the second output end of the second plate heat exchanger 31. A liquid level detection device for realizing high water level alarm and low water level alarm is provided in the second insulated water tank 32. The first temperature sensor 33 and the liquid level detection device are electrically connected to the control device respectively.

[0041] For further information, see Figure 1 A second temperature sensor 23 is provided on the connecting pipeline between the second input end of the first plate heat exchanger 22 and the output end of the preheating device 24; a third temperature sensor 27 is provided on the connecting pipeline between the first output end of the first plate heat exchanger 22 and the input end of the normal temperature water recovery mechanism, and the third temperature sensor 27 and the second temperature sensor 23 are electrically connected to the control device respectively.

[0042] In this embodiment, the control device is preset with a suitable water temperature range for the second insulated water tank 32 and can obtain the real-time outdoor temperature; when the liquid level detection device feeds back a low water level alarm signal, the control device controls the water supply pipeline to deliver water to the second plate heat exchanger 31, and controls and adjusts the opening ratio of the second port and the third port of the three-way valve 15, so that the first insulated water tank 13 can simultaneously deliver heat to the first plate heat exchanger 22 and the second plate heat exchanger 31; during the heat source delivery process, according to the comparison result of the real-time water outlet temperature fed back by the first temperature sensor 33 with the preset suitable water temperature range, and the comparison result of the real-time temperature fed back by the second temperature sensor 23 and the third temperature sensor 27 with the real-time outdoor temperature, the PID algorithm is used to adjust the heat source output The opening ratio of the delivery pump and the three-way valve 15 and the working state of the preheating delivery pump are adjusted to reduce the normal temperature water output by the first plate heat exchanger 22 to the outdoor temperature level, that is, to ensure that the temperature of the steam condensate water is close to the outdoor temperature after being used; when the liquid level detection device feeds back a high water level alarm signal, the control device controls the second port of the three-way valve 15 to be closed, and the first insulated water tank 13 only provides heat source to the high-temperature heat utilization mechanism through the three-way valve 15. At this time, the control device uses the PID algorithm to adjust the working states of the heat source delivery pump and the preheating delivery pump according to the comparison result of the real-time temperature fed back by the second temperature sensor 23 and the third temperature sensor 27 with the outdoor real-time temperature, so that the normal temperature water output by the first plate heat exchanger 22 is reduced to the outdoor temperature level.

[0043] 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 high temperature heat utilization mechanism, 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.

[0044] 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.

[0045] For example, the working mode of the energy cascade recovery system disclosed in this application is:

[0046] 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 first thermal insulation water tank 13 for storage. The condensate temperature T1 is above 90°C, and is assumed to be 95°C in this example.

[0047] When the rotary dehumidifier 26 is running, the hot water delivery pump 14 and the preheating circulation pump 21 are turned on, and the medium-temperature water recovery mechanism and the high-temperature heat utilization mechanism are started; when the liquid level in the second insulated water tank 32 is too low, the tap water replenishment pipeline is started, and at this time, the control device controls and adjusts the opening ratio of the three-way valve 15 according to the secondary side outlet water temperature T4 of the second plate heat exchanger 31 and the secondary side outlet water temperature T6 of the first plate heat exchanger 22. After the primary side heat exchange, the water temperature is reduced to T2 and then returned to the main pipeline for mixing. At this time, the mixed water temperature is T3; when the second insulated water tank 32 stops replenishing water, the connecting pipeline of the second plate heat exchanger 31 is closed through the three-way valve 15, and the steam condensed water output from the first insulated water tank 13 all flows to the first plate heat exchanger 22;

[0048] The primary side of the first plate heat exchanger 22 fully exchanges heat between the steam condensate at a temperature of T3 and the circulating water at the secondary side. The hot water T6 obtained at the secondary side is transported to the preheating device 24 for preheating the regeneration air of the rotary dehumidifier 26. The normal temperature water T7 cooled by the regeneration air is continuously transported back to the plate heat exchanger for circulating heat exchange. The normal temperature water T10 cooled by the secondary side is transported to the normal temperature water tank 41 for storage.

[0049] 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 according to the volume required for daily water consumption. 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.

[0050] The design of the second plate heat exchanger 31 of the energy cascade recovery system disclosed in the present application is designed based on the hot fluid outlet temperature being 1°C higher than the cold fluid outlet temperature, that is, assuming that T4 is designed to be 55°C, then T2 is 56°C; the inlet and outlet temperature differences of the cold fluid and the hot fluid of the first plate heat exchanger 22 are both designed to be 1°C, that is, the temperature of T6 is 1°C lower than that of T3, that is, T6=T3-1. Assuming that the temperature fluctuation range of T3 during system operation is 56-95°C, the fluctuation range of T6 is 55°C-94°C; assuming that The outdoor temperature range of the area in this example is determined to be 5°C-30°C at the fresh air inlet T8, that is, the corresponding cold water outlet T7 of the secondary side preheating device 24 fluctuates in the range of 15°C-31°C throughout the year, and the corresponding primary side normal temperature water outlet temperature T10 fluctuates in the range of 16°C-32°C; the design of the specific preset device needs to be designed according to the most unfavorable temperature conditions of the specific area; according to the law of conservation of energy, the preheating device 24 disclosed in the present application, the supply air temperature range after fresh air preheating is >50°C throughout the year.

[0051] The advantages of the energy cascade recovery system disclosed in the present application are: no matter how the outdoor temperature changes, the system can utilize high-temperature condensed water above 90°C to normal temperature level, thereby realizing complete recovery and utilization of thermal energy, and the hot water of different temperatures generated in the recovery process, that is, the hot water of different thermal energy grades generated, can be used in different places, which has great energy saving and economic value; the water resources recovered by the system are normal temperature water after steam condensation, which can be directly recycled for use in cooling towers and other equipment that need to consume normal temperature water, thereby realizing the recovery and utilization of water resources; for the lithium battery and electronics industries, their rotary dehumidification systems often need to run uninterruptedly for 24 hours, and the heat energy required for the regenerated 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 discharge system.

[0052] 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. An energy cascade recovery system, characterized in that: It includes a steam condensate recovery mechanism, a medium-temperature water recovery mechanism, a high-temperature heat utilization 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 respectively connected to the input end of the medium-temperature water recovery mechanism and the first input end of the high-temperature heat utilization mechanism. The first output end of the high-temperature heat utilization mechanism 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. The high-temperature heat utilization mechanism is used to realize the regeneration air preheating of the rotary dehumidifier.

2. The energy cascade recovery system according to claim 1, characterized in that: The high-temperature heat utilization mechanism includes a heat exchange part and a preheating part. The first input end of the heat exchange part is connected to the output end of the steam condensate water recovery mechanism, and 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 and the input end of the preheating part are respectively connected to the second input end and the second output end of the heat exchange part. The preheating part is used to realize the regeneration air preheating of the rotary dehumidifier.

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

4. The energy cascade recovery system according to claim 3, characterized in that: The preheating part 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.

5. The energy cascade recovery system according to claim 4, 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.

6. The energy cascade recovery system according to claim 4, characterized in that: It also includes a control device, the steam condensate recovery mechanism includes a plurality of steam traps, a condensate recovery pump, a first insulated water tank, a hot water delivery pump and a three-way valve; the input ends of the plurality of steam traps are respectively used to connect to the steam condensate output device, the output ends of the plurality of steam traps are respectively connected to the input end of the condensate recovery pump through a condensate recovery pipeline, the output end of the condensate recovery pump is connected to the input end of the first insulated water tank, the output end of the first insulated water tank is connected to the first port of the three-way valve through the hot water delivery pump, the second port and the third port of the three-way valve are respectively connected to the input end of the medium-temperature water recovery mechanism and the first input end of the high-temperature heat utilization mechanism; the hot water delivery pump and the three-way valve are respectively electrically connected to the control device.

7. The energy cascade recovery system according to claim 6, characterized in that: The medium-temperature water recovery mechanism includes a second plate heat exchanger and a second insulated water tank. The second port of the three-way valve is connected to the first input end of the second plate heat exchanger, and the first input end of the second plate heat exchanger is connected to the first input end of the first plate heat exchanger; the second input end of the second plate heat exchanger is used to connect to the water supply pipeline, the second output end of the second plate heat exchanger is connected to the water inlet of the second insulated water tank, and the water outlet of the second insulated water tank is used to connect to the domestic hot water pipeline.

8. The energy cascade recovery system according to claim 7, characterized in that: A first temperature sensor is arranged on the connecting pipeline between the second insulated water tank and the second output end of the second plate heat exchanger, and a liquid level detection device for realizing high water level alarm and low water level alarm is arranged in the second insulated water tank. The first temperature sensor and the liquid level detection device are electrically connected to the control device respectively.

9. The energy cascade recovery system according to claim 7, characterized in that: A second temperature sensor is provided on the connecting pipeline between the second input end of the first plate heat exchanger and the output end of the preheating device; a third temperature sensor is provided on the connecting pipeline between the first output end of the first plate heat exchanger and the input end of the normal temperature water recovery mechanism, and the third temperature sensor and the second temperature sensor are electrically connected to the control device respectively.

10. The energy cascade recovery 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 high temperature heat utilization mechanism, and the output end of the normal temperature water tank is connected to the water replenishment pump. The output end of the water replenishment pump is used to output normal temperature water to the water-demanding equipment.

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