Energy-saving device of heat energy system

Abstract

The utility model provides an energy-saving device of a heat energy system. The energy-saving device comprises a condensation water tank, a condensation pump, a first plate heat exchanger, a circulating pump, a second plate heat exchanger and a hot water tank, a top inlet of the condensation water tank is connected with a high-temperature condensation water recycling pipe discharged by an industrial factory building. The condensation water tank, the condensation pump and a high-temperature condensation water channel of the first plate heat exchanger are sequentially communicated to form a closed condensation water heat exchange loop. Industrial steam of the industrial factory building is communicated with an industrial steam channel of the second plate heat exchanger, and an industrial steam outlet of the second plate heat exchanger is communicated with a top inlet of the condensation water tank to form a steam heat exchange loop. According to the energy-saving device of the heat energy system, normal heat exchange and drainage of condensed water can be carried out at the same time; the device is further provided with steam for auxiliary heating, domestic water is subjected to heat exchange through the two plate heat exchangers, the requirement is met, and the heat exchange temperature is guaranteed.

Description

Technical Field

[0001] The utility model belongs to the technical field of condensate waste heat recovery, in particular to an energy-saving device for a thermal energy system. Background Art

[0002] Part of the condensate generated in the process of industrial steam production in industrial plants cannot be recycled. If it is directly discharged, this part of the heat energy will be wasted. In actual use, this part of the heat energy can be used for domestic hot water heat exchange. The existing domestic hot water heat exchange system is supplied from the condensate high-temperature water tank to the semi-volumetric heat exchanger to exchange heat with tap water. However, this heat exchange system only has a supply pipeline for condensate, but no return pipeline. The condensate cannot be circulated for heat exchange and cannot be recycled and reused, and the energy consumption is too high. In addition, when the condensate tank is full, the existing domestic hot water heat exchange system cannot simultaneously drain the condensate and perform heat exchange treatment. Utility Model Content

[0003] In order to solve the problems existing in the prior art, the utility model aims to provide a thermal energy system energy-saving device, which is provided with a condensate return pipe, and the condensate can be circulated for heat exchange, thereby saving resources.

[0004] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0005] A heat energy system energy-saving device comprises a condensate water tank, a condensate pump, a first plate heat exchanger, a circulation pump, a second plate heat exchanger, and a hot water tank;

[0006] The top inlet of the condensate tank is connected to the high-temperature condensate recovery pipe discharged from the industrial plant, and the condensate tank, the condensate pump, and the high-temperature condensate channel of the first plate heat exchanger are connected in sequence to form a closed condensate heat exchange loop; a drainage pipeline is also arranged between the condensate pump and the high-temperature condensate inlet of the first plate heat exchanger, and a drainage valve is arranged on the drainage pipeline;

[0007] The industrial steam of the industrial plant is connected to the industrial steam channel of the second plate heat exchanger, and the industrial steam outlet of the second plate heat exchanger is connected to the top inlet of the condensate tank to form a steam heat exchange loop;

[0008] The circulation pump, the circulation water channel of the first plate heat exchanger, the circulation water channel of the second plate heat exchanger, and the hot water tank are connected in sequence to form a tap water replenishment pipeline. The inlet of the circulation pump is connected to the replenishment pipe, and the hot water outlet of the hot water tank is connected to the domestic hot water supply pipe; a pressure relief pipeline is also arranged between the hot water outlet of the hot water tank and the domestic hot water supply pipe, and an overpressure relief valve is arranged on the pressure relief pipeline.

[0009] Furthermore, it also includes a hot water return pipe, which is connected in parallel with the water supply pipe and connected to the circulation pump after parallel connection; the hot water return pipe, the circulation pump, the circulating water channel of the first plate heat exchanger, the circulating water channel of the second plate heat exchanger, and the hot water tank are connected in sequence to form a hot water circulation pipeline.

[0010] Furthermore, a first temperature control valve for controlling the flow rate of high-temperature condensate water entering the first plate heat exchanger is provided on the pipeline at the high-temperature condensate inlet of the first plate heat exchanger.

[0011] Furthermore, a second temperature control valve for controlling the steam flow entering the second plate heat exchanger is provided on the air intake pipeline connected to the industrial steam inlet of the second plate heat exchanger, and the steam passes through the second temperature control valve to the second plate heat exchanger.

[0012] Furthermore, two condensate pumps are provided, which are connected in parallel and respectively arranged on two branch pipelines, and valves are arranged at the head and tail of each branch pipeline.

[0013] Furthermore, two circulating pumps are provided, which are connected in parallel and respectively arranged on two branch pipelines, and valves are arranged at the head and tail of each branch pipeline.

[0014] Furthermore, a water tank temperature sensor is provided on one side of the condensation water tank, and a liquid level sensor is provided inside the condensation water tank.

[0015] Furthermore, a first temperature sensor for detecting the temperature of the circulating water of the first plate heat exchanger is provided on the pipeline between the circulating water outlet of the first plate heat exchanger and the second plate heat exchanger.

[0016] Furthermore, a short-circuit pipe is arranged between the circulating water inlet and the circulating water outlet of the first plate heat exchanger, and a third bypass valve is arranged on the short-circuit pipe.

[0017] Furthermore, a second temperature sensor and a second pressure sensor for detecting the temperature and pressure of circulating water entering the domestic hot water supply pipe are provided on the pipeline between the hot water tank and the hot water supply port.

[0018] Compared with the prior art, the thermal energy system energy-saving device described in the utility model has the following advantages:

[0019] (1) Compared with the prior art, the energy-saving device for the thermal energy system described in the utility model is provided with a condensate return pipe, and the condensate can be recycled and reused for circulating heat exchange, thereby saving resources.

[0020] (2) The thermal energy system energy-saving device described in the utility model can simultaneously carry out normal heat exchange and drainage of condensate when the temperature of the condensate tank meets the requirements for heat exchange and the liquid level in the tank reaches the point where it needs to be discharged. The device is also provided with steam-assisted heating, so that domestic water is exchanged through two plate heat exchangers to meet the requirements and ensure the heat exchange temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the accompanying drawings:

[0022] Figure 1 The present invention is a schematic diagram of the overall structure of an embodiment of the present invention.

[0023] Description of reference numerals:

[0024] 1. Condensate tank; 11. Controller; 12. Inverter; 2. Condensate pump; 21. First condensate pump; 22. Second condensate pump; 3. First plate heat exchanger; 3.1. High-temperature condensate inlet; 3.3. Circulating water inlet; 3.4. Circulating water outlet; 3.5. First temperature control valve; 3.6. First temperature sensor; 4. Circulating pump; 41. First circulating pump; 42. Second circulating pump; 5. Second plate heat exchanger; 5.1. Industrial steam inlet; 5.2. Industrial steam outlet; 5.3. Second Temperature control valve; 6. Hot water tank; 7. Drain valve; 8. Overpressure drain valve; 9.1. Water supply pipe; 9.2. Hot water return pipe; 9.3. Domestic hot water supply pipe; 9.4. Valve; 9.5. Second temperature sensor; 9.6. Second pressure sensor; 9.8. First bypass valve; 9.9. Steam trap; 1.0. Second bypass valve; 1.1. Third bypass valve; 1.2. Water tank temperature sensor; 1.3. Water tank pressure sensor; 1.4. Third temperature sensor; 1.5. Third pressure sensor. DETAILED DESCRIPTION

[0025] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0026] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0027] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0028] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0029] like Figure 1 As shown, a thermal energy system energy-saving device includes a condensate tank 1, a condensate pump 2, a first plate heat exchanger 3, a circulation pump 4, a second plate heat exchanger 5, and a hot water tank 6;

[0030] The top inlet of the condensate tank 1 is connected to the high-temperature condensate recovery pipe discharged from the industrial plant, and the high-temperature condensate channels of the condensate tank 1, the condensate pump 2, and the first plate heat exchanger 3 are connected in sequence to form a closed condensate heat exchange loop; a drainage pipeline is also arranged between the condensate pump 2 and the high-temperature condensate inlet 3.1 of the first plate heat exchanger 3, and a drainage valve 7 is arranged on the drainage pipeline;

[0031] The industrial steam of the industrial plant is connected to the industrial steam channel of the second plate heat exchanger 5, and the industrial steam outlet 5.2 of the second plate heat exchanger 5 is connected to the top inlet of the condensate tank 1, forming a steam heat exchange loop;

[0032] The circulating pump 4, the circulating water channel of the first plate heat exchanger 3, the circulating water channel of the second plate heat exchanger 5, and the hot water tank 6 are connected in sequence to form a tap water replenishment pipeline. The circulating water inlet 3.3 of the first plate heat exchanger 3 is connected to the circulating pump 4, the circulating pump 4 is connected to the replenishment pipe 9.1, and the hot water outlet of the hot water tank 6 is connected to the domestic hot water supply pipe; a pressure relief pipeline is also arranged between the hot water outlet of the hot water tank and the domestic hot water supply pipe 9.3, and an overpressure relief valve 8 is arranged on the pressure relief pipeline.

[0033] In a preferred embodiment of the utility model, it also includes a hot water return pipe 9.2, which is connected in parallel with the water supply pipe 9.1 and connected to the circulation pump 4 after parallel connection; the hot water return pipe 9.2, the circulation pump 4, the circulating water channel of the first plate heat exchanger 3, the circulating water channel of the second plate heat exchanger 5, and the hot water tank 6 are connected in sequence to form a hot water circulation pipeline.

[0034] In actual use, tap water circulates in the hot water circulation pipeline and can pass through the first plate heat exchanger 3 and the second plate heat exchanger 5 for multiple times to exchange heat and reach the required temperature, or keep the hot water at a certain temperature through circulation.

[0035] In a preferred embodiment of the utility model, a first temperature control valve 3.5 for controlling the flow rate of high-temperature condensate entering the first plate heat exchanger 3 is provided on the pipeline at the high-temperature condensate inlet 3.1 of the first plate heat exchanger 3.

[0036] In actual use, the flow rate of high-temperature condensed water in the first plate heat exchanger 3 is adjusted by adjusting the opening of the first temperature control valve 3.5, thereby adjusting the temperature of the hot water after heat exchange in the first plate heat exchanger 3.

[0037] In a preferred embodiment of the utility model, a second temperature control valve 5.3 for controlling the steam flow entering the second plate heat exchanger 5 is provided on the air intake pipeline connected to the industrial steam inlet 5.1 of the second plate heat exchanger 5, and the steam passes through the second temperature control valve 5.3 to the second plate heat exchanger 5.

[0038] In actual use, the second temperature control valve 5.3 is an electric regulating valve. By adjusting the opening of the second temperature control valve 5.3, the steam flow in the second plate heat exchanger 5 is adjusted, thereby adjusting the temperature of the hot water after heat exchange in the second plate heat exchanger 5;

[0039] The steam heat exchange circuit is used as a backup heat exchange circuit. When there is no steam condensate or the condensate heat exchange fails to reach the set temperature, the steam heat exchange circuit is started. For example, if the first temperature control valve 3.5 is set to start at 44°C and stop at 48°C, the second temperature control valve 5.3 needs to be set to start below 43°C and stop above 45°C, so as to ensure that the condensate heat exchange circuit is activated first. At the same time, the condensate generated by the steam is recovered to the condensate tank 1 by the condensate back pressure for reuse.

[0040] The air intake pipeline connecting the industrial steam of the industrial plant with the industrial steam inlet 5.1 of the second plate heat exchanger 5 is provided with a stop valve, a thermometer, a pressure gauge, a Y-type filter, a pressure gauge, a second temperature control valve 5.3, and a stop valve in sequence along the air flow direction; this air intake pipeline is also connected in parallel with an air intake branch, and a first bypass valve 9.8 is provided on the air intake branch; when the second temperature control valve 5.3 on the air intake pipeline fails, the first bypass valve 9.8 is opened and the air intake branch is enabled to ensure the normal operation of the system;

[0041] On the return water pipeline connecting the industrial steam outlet 5.5 of the second plate heat exchanger 5 with the condensate tank 1, a stop valve, a steam trap 9.9, a check valve and a stop valve are sequentially arranged along the water flow direction; this return water pipeline is also connected in parallel with a return water branch, and a second bypass valve 1.0 is arranged on the return water branch; when the steam trap 9.9 on the return water pipeline fails, the second bypass valve 1.0 is opened and the return water branch is started to ensure the normal operation of the system.

[0042] In a preferred embodiment of the present invention, two condensate pumps 2 are provided, and the two condensate pumps 2 are connected in parallel and respectively provided on two branch pipelines, and valves 9.4 are provided at the head and the tail of each branch pipeline.

[0043] In actual use, a butterfly valve, a branch pipeline, a butterfly valve, and a first temperature control valve 3.5 are sequentially arranged along the water flow direction between the outlet of the condensate tank 1 and the high-temperature condensate inlet 3.1 of the first plate heat exchanger 3; a valve 9.4, a condensate pump 2, a check valve, and a valve 9.4 are sequentially arranged on each branch pipeline along the water flow direction.

[0044] The two condensate pumps 2 are respectively the first condensate pump 21 and the second condensate pump 22, and the first condensate pump 21 is connected in parallel with the second condensate pump 21; the first condensate pump 21 and the second condensate pump 22 provide power for heat exchange and drainage of the first plate heat exchanger 3; the second condensate pump 22 is used as a backup condensate pump, and when the first condensate pump 20 fails, the second condensate pump 22 is started.

[0045] In a preferred embodiment of the present invention, two circulating pumps 4 are provided, which are connected in parallel and respectively arranged on two circulating pump branch pipelines, and valves 9.4 are arranged at the head and tail of each circulating pump branch pipeline.

[0046] In actual use, each circulation pump branch pipeline is sequentially provided with a valve 9.4, a Y-type filter, a circulation pump 4, a pressure gauge, a check valve, and a valve 9.4 along the direction from the water supply pipe to the first plate heat exchanger 3.

[0047] The two circulating pumps 4 are the first circulating pump 41 and the second circulating pump 42. The second circulating pump 42 is used as a backup circulating pump. When the first circulating pump 41 is not automatic or fails or the power supply is not connected or cannot be started or the pressure is still insufficient after exceeding the loading frequency, the second circulating pump 42 is started; when the two pumps are running at the same time, the circulating pump frequency is lower than the loading frequency and the pressure exceeds the set value, the second circulating pump 42 is turned off. Each circulating pump 4 has three control modes, one is the panel control of the inverter, the second is the manual automatic switching switch and button control on the electrical cabinet, and the third is the touch screen HMI control.

[0048] In a preferred embodiment of the utility model, it also includes a controller 11 and a frequency converter 12, the controller 11 is electrically connected to the frequency converter 12 for controlling the frequency of the circulation pump 4, and the controller 11 is electrically connected to the condensation pump 2, the first temperature control valve 3.5 and the second temperature control valve 5.3.

[0049] In a preferred embodiment of the utility model, a water tank temperature sensor 1.2 and a water tank pressure sensor 1.3 are provided on one side of the condensation water tank 1, and a liquid level sensor is provided inside the condensation water tank 1. The water tank temperature sensor 1.2, the water tank pressure sensor 1.3 and the liquid level sensor are all electrically connected to the controller 11.

[0050] In a preferred embodiment of the present invention, a first temperature sensor 3.6 for detecting the circulating water temperature of the first plate heat exchanger 3 is provided on the pipeline between the circulating water outlet 3.4 of the first plate heat exchanger 33 and the second plate heat exchanger 5, and the first temperature sensor 3.6 is electrically connected to the controller 11.

[0051] In actual use, the controller 11 compares the signal value collected by the first temperature sensor 3.4 with the set value. When the collected actual value is lower than the set value, the controller 11 controls the first temperature control valve 3.5 to increase its opening, thereby increasing the heat source flow rate, so that the actual value approaches the set temperature value, and at the same time detects whether the temperature measurement value is basically stable within the set value range; when the actual value is higher than the set value temperature, vice versa.

[0052] In a preferred embodiment of the present invention, a short-circuit pipe is provided between the circulating water inlet 3.3 and the circulating water outlet 3.4 of the first plate heat exchanger 3, and a third bypass valve 1.1 is provided on the short-circuit pipe.

[0053] In actual use, when the first plate heat exchanger 3 fails, the third bypass valve 1.1 is opened and the short-circuit line is started to ensure the normal operation of the system.

[0054] In a preferred embodiment of the utility model, the domestic hot water supply pipe 9.3 is provided with a second temperature sensor 9.5 and a second pressure sensor 9.6 for detecting the temperature and pressure of circulating water entering the domestic hot water supply pipe (9.3), and the second temperature sensor 9.5 and the second pressure sensor 9.6 are both electrically connected to the controller 11.

[0055] In actual use, when the second temperature sensor 9.5 detects that the hot water temperature is 1.5°C lower than the set temperature, the second temperature control valve 5.3 is opened for heat exchange;

[0056] During the heat exchange process, the value of the second temperature sensor 9.5 collected by the second temperature sensor 9.5 is compared with the set value. When the actual value collected is lower than the set value, the controller 11 controls the second temperature control valve 5.3 to increase the opening, thereby increasing the heat source flow rate, so that the actual value tends to approach the set temperature value, and at the same time detects whether the temperature measurement value is basically stable within the set value range; when the actual value is higher than the set value temperature, vice versa;

[0057] The controller 11 compares the signal value collected by the second pressure sensor 9.6 with the set value. When the actual value collected is higher than the set value, the overpressure relief valve 8 is opened to release the pressure, thereby adjusting the pressure of the water supply pipeline.

[0058] In a preferred embodiment of the utility model, a pressure gauge, a thermometer, a third temperature sensor 1.4 and a third pressure sensor 1.5 are sequentially provided on the hot water return pipe 9.2 from the hot water return pipe to the circulation pump, and the third temperature sensor 1.4 and the third pressure sensor 1.5 are electrically connected to the controller 11.

[0059] In actual use, the controller 11 controls the start and stop and frequency adjustment of the two circulation pumps 4 according to the pressure difference value measured by the third pressure sensor 1.4 and the second pressure sensor 1.5 and the set value, so as to realize the stable control of the secondary water supply pressure difference. When the actual value of the measured pressure difference is less than the set value, the frequency of the circulation pump 4 is increased; when the actual value of the pressure difference is greater than the set value, the frequency of the circulation pump 4 is reduced.

[0060] In a preferred embodiment of the present invention, the high-temperature condensate inlet and outlet, the circulating water inlet and outlet of the first plate heat exchanger 3, and the industrial steam inlet and outlet, the circulating water inlet and outlet of the second plate heat exchanger 5 are all provided with pressure gauges, thermometers and valves.

[0061] The working process of the thermal energy system energy-saving device provided by the utility model:

[0062] When tap water is used for heat exchange, the high-temperature condensate discharged from the industrial plant enters the condensate tank 1, and returns to the condensate tank 1 from the bottom of the condensate tank 1 after passing through the condensate pump 2, the first temperature control valve 3.5, and the high-temperature condensate channel of the first plate heat exchanger 3 (where the temperature of the hot water after heat exchange is adjusted by the opening of the first temperature control valve 3.5);

[0063] The tap water passes through the circulation pump 4, the circulation water channel of the first plate heat exchanger 3, the circulation water channel of the second plate heat exchanger 5, and the hot water tank 6 in sequence, and then flows out from the domestic hot water supply pipe 9.3 for domestic use (the second plate heat exchanger 5 does not perform heat exchange at this time).

[0064] When there is no steam condensate or the condensate heat exchange fails to reach the set temperature, steam starts, and industrial steam enters the industrial steam channel of the second plate heat exchanger 5 from the industrial steam inlet 5.1. The condensate generated by the steam is recovered to the condensate tank 1 by the condensate back pressure for reuse.

[0065] During heat exchange, tap water circulates in a hot water circulation pipeline consisting of the hot water return pipe 9.2, the circulation pump 4, the circulation water channel of the first plate heat exchanger 3, the circulation water channel of the second plate heat exchanger 5, and the hot water tank 6.

[0066] When the following conditions are met, the condensate tank 1 needs to be drained:

[0067] (1) When the liquid level sensor in the condensate tank 1 detects that the water is full, the controller 11 opens the drain valve 7 and starts the condensate pump 2 to discharge the condensate from the condensate tank 1 through the condensate pump 2 and the drain valve 7 to the drain point.

[0068] (2) When the water tank temperature sensor 12 detects that the temperature in the condensate tank 1 is insufficient for heat exchange, the controller 11 opens the drain valve 7 and starts the condensate pump 2 to discharge the condensate in the condensate tank 1;

[0069] (3) When the temperature in the condensate tank 1 meets the requirements for heat exchange and the liquid level reaches the discharge water level, and heat exchange is required (the detection value of the second temperature sensor 9.5 is 1.5°C lower than the set temperature), the drain valve 7 and the first temperature control valve 3.5 are opened at the same time, and heat exchange and drainage are performed at the same time. At this time, the circulation head of the first plate heat exchanger 3 needs to be less than the head of the drain valve 3. The following is the calculation of the pipeline head in this embodiment:

[0070] ① Pipeline head discharged by drain valve 3

[0071] The first plate heat exchanger 3 is arranged on the underground first floor of Building C, and the pipeline leaves the building at -1m of Building B. The drainage lift is about 4 meters, the pipeline length is about 80 meters, the head loss is about 2 meters, and the total lift of the drainage valve pipeline is about 6 meters.

[0072] ②Heat exchanger head loss

[0073] The head loss of the heat exchanger is 5.7Kpa (0.57 meters), the lifting height of the heat exchanger is about 2.5 meters, and the total head of the heat exchanger pipeline is about 3.07 meters;

[0074] It can be concluded from the above that the head of the heat exchange pipeline is smaller than the head of the discharge pipeline. Therefore, when the first condensation pump 2 is draining water, the first plate heat exchanger 3 can be driven to operate normally for heat exchange at the same time.

[0075] The temperature of steam condensate is close to 100℃ under normal pressure, the tap water supply temperature is about 10℃ in winter and about 20℃ in summer; in this embodiment, the domestic hot water temperature is controlled at 45℃, and the temperature of the tap water is about 10℃ in winter. 3 Steam condensate (95℃) can theoretically heat about 1.4 tons of hot water. In summer, every 1m 3 Steam condensate (95°C) can theoretically heat about 2 tons of hot water. To heat one ton of water from 10°C to 45°C, we know from (4200J*1000*35°C) / 3600 that it takes about 40.8 kWh of electricity. Heating 1.4 tons of tap water takes about 57.1 kWh of electricity. Compared with electric heating, this system has better energy-saving effect.

[0076] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A thermal energy system energy-saving device, comprising a condensate tank (1), a condensate pump (2), a first plate heat exchanger (3), a circulation pump (4), and a hot water tank (6), characterized in that: Also includes a second plate heat exchanger (5); The top inlet of the condensate tank (1) is connected to a high-temperature condensate recovery pipe discharged from an industrial plant, and the condensate tank (1), the condensate pump (2), and the high-temperature condensate channel of the first plate heat exchanger (3) are connected in sequence to form a closed condensate heat exchange loop; a drainage pipeline is also provided between the condensate pump (2) and the high-temperature condensate inlet (3.1) of the first plate heat exchanger (3), and a drainage valve (7) is provided on the drainage pipeline; The industrial steam of the industrial plant is connected to the industrial steam channel of the second plate heat exchanger (5), and the industrial steam outlet (5.2) of the second plate heat exchanger (5) is connected to the top inlet of the condensate tank (1), forming a steam heat exchange loop; The circulation pump (4), the circulation water channel of the first plate heat exchanger (3), the circulation water channel of the second plate heat exchanger (5), and the hot water tank (6) are connected in sequence to form a tap water replenishment pipeline. The inlet of the circulation pump (4) is connected to the replenishment pipe (9.1), and the hot water outlet of the hot water tank (6) is connected to the domestic hot water supply pipe (9.3); a pressure relief pipeline is also arranged between the hot water outlet of the hot water tank (6) and the domestic hot water supply pipe (9.3), and an overpressure relief valve (8) is arranged on the pressure relief pipeline.

2. The thermal energy system energy saving device according to claim 1, characterized in that: It also includes a hot water return pipe (9.2), which is connected in parallel with the water supply pipe (9.1) and connected to the circulation pump (4) after being connected in parallel; the hot water return pipe (9.2), the circulation pump (4), the circulation water channel of the first plate heat exchanger (3), the circulation water channel of the second plate heat exchanger (5), and the hot water tank (6) are connected in sequence to form a hot water circulation pipeline.

3. The thermal energy system energy saving device according to claim 1, characterized in that: A first temperature control valve (3.5) for controlling the flow rate of high-temperature condensate entering the first plate heat exchanger (3) is provided on the pipeline at the high-temperature condensate inlet (3.1) of the first plate heat exchanger (3).

4. The thermal energy system energy saving device according to claim 1, characterized in that: A second temperature control valve (5.3) for controlling the flow of steam entering the second plate heat exchanger (5) is provided on an air intake pipeline connected to the industrial steam inlet (5.1) of the second plate heat exchanger (5), and the steam passes through the second temperature control valve (5.3) to the second plate heat exchanger (5).

5. The thermal energy system energy saving device according to claim 1, characterized in that: Two condensate pumps (2) are provided. The two condensate pumps (2) are connected in parallel and are respectively provided on two branch pipelines. Valves (9.4) are provided at the beginning and end of each branch pipeline.

6. The thermal energy system energy saving device according to claim 1, characterized in that: Two circulating pumps (4) are provided, and the two circulating pumps (4) are connected in parallel and respectively arranged on two branch pipelines, and valves (9.4) are arranged at the head and the tail of each branch pipeline.

7. The thermal energy system energy saving device according to claim 1, characterized in that: A water tank temperature sensor (1.2) is provided on one side of the condensation water tank (1), and a liquid level sensor is provided inside the condensation water tank (1).

8. The thermal energy system energy saving device according to claim 1, characterized in that: A first temperature sensor (3.6) for detecting the temperature of the circulating water of the first plate heat exchanger (3) is provided on the pipeline between the circulating water outlet (3.4) of the first plate heat exchanger (3) and the second plate heat exchanger (5).

9. The thermal energy system energy saving device according to claim 1, characterized in that: A short-circuit pipe is provided between the circulating water inlet (3.3) and the circulating water outlet (3.4) of the first plate heat exchanger (3), and a third bypass valve (1.1) is provided on the short-circuit pipe.

10. The thermal energy system energy saving device according to claim 1, characterized in that: A second temperature sensor (9.5) and a second pressure sensor (9.6) for detecting the temperature and pressure of circulating water entering the domestic hot water supply pipe (9.3) are provided on the pipeline between the hot water tank (6) and the hot water supply port.

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