Heat recovery method and device of heat supply system, storage medium and electronic device

Abstract

The invention discloses a heat recovery method and device of a heat supply system, a storage medium and an electronic device. The method comprises the steps that a first temperature value of circulating water in the heat supply system after passing through a primary heat supply network heat exchanger is obtained; under the condition that the first temperature value is larger than the preset temperature value of the cold user or the air source heat exchanger, secondary heat exchange treatment is conducted on the circulating water, circulating water of a second temperature value is obtained, and the first temperature value is larger than the second temperature value; and the circulating water with the second temperature value is conveyed to a waste steam heat recovery heat exchanger for heat recovery. By the adoption of the technical scheme, the problem that heat of circulating water in the heat supply system cannot be effectively recycled and utilized is solved. Furthermore, by adjusting the temperature of the circulating water in the heat supply system and recycling the heat exceeding the demand in the circulating water, the waste steam heat recovery efficiency and the overall energy utilization efficiency are improved.

Description

Technical Field

[0001] The present application relates to the field of heating technology, and in particular to a heat recovery method and device, a storage medium and an electronic device for a heating system. Background Art

[0002] In urban centralized heating systems, thermal power plants usually use waste heat recovery technology to improve energy utilization and reduce operating costs. In traditional heating systems, after the circulating water passes through the primary heat network heat exchanger, its temperature is often higher than the actual cold user or air source heat exchanger. This temperature mismatch not only leads to energy waste, but also reduces the overall efficiency of the system. In the prior art, cooling towers or additional heat exchange equipment are usually used to reduce the temperature of the circulating water, but this method not only increases the complexity and operating cost of the system, but may also cause additional heat loss and efficiency reduction. In addition, as a kind of waste heat, although the exhaust steam of the thermal power plant has great potential, its recycling is usually limited by technical limitations. Most of the existing exhaust steam recovery technologies focus on increasing the temperature or pressure of the exhaust steam for heating, but this method often requires additional energy input, such as electricity or fuel, thereby increasing the energy consumption and operating costs of the system. Therefore, how to effectively adjust the temperature of the circulating water in the heating system so that it can not only meet the use requirements of the cold user or air source heat exchanger, but also be able to recycle the excess heat in the over-high temperature circulating water has become a key technical issue to improve the energy utilization efficiency and reduce the operating costs of thermal power plants.

[0003] With regard to the problem in the related art that the heat of circulating water in the heating system cannot be effectively recovered and utilized, no effective solution has been proposed so far.

[0004] Therefore, it is necessary to improve the existing related technologies to overcome the above-mentioned defects in the related technologies and meet the needs of current actual production. Summary of the invention

[0005] The embodiments of the present application provide a heat recovery method and device, a storage medium and an electronic device for a heating system, so as to at least solve the problem in the related art that the heat of circulating water in the heating system cannot be effectively recovered and utilized.

[0006] According to one aspect of an embodiment of the present application, a heat recovery method for a heating system is provided, comprising: obtaining a first temperature value of circulating water in the heating system after passing through a primary heat network heat exchanger; performing a secondary heat exchange treatment on the circulating water to obtain circulating water of a second temperature value when the first temperature value is greater than a preset temperature value of a cold user or an air source heat exchanger, wherein the first temperature value is greater than the second temperature value; and transmitting the circulating water of the second temperature value to a waste steam heat recovery heat exchanger for heat recovery.

[0007] In an exemplary embodiment, after obtaining the first temperature value of the circulating water in the heating system after passing through the primary heat network heat exchanger, the method further includes: when the first temperature value is less than or equal to the preset temperature value of the cold user or air source heat exchanger, directly transmitting the circulating water with the first temperature value to the exhaust steam heat recovery heat exchanger for heat recovery; and determining the water temperature that is allowed to be increased when the secondary flow inlet of the ejector is working based on the heat recovery result.

[0008] In an exemplary embodiment, after obtaining the first temperature value of the circulating water in the heating system after passing through the primary heat network heat exchanger, the method further includes: monitoring the temperature change of the first temperature value within the target cycle, wherein the temperature change is used to indicate the difference between the maximum temperature value and the minimum temperature value within the target cycle; when the temperature change is greater than a preset change amount, adjusting the steam extraction amount of the heating system and the operating parameters of the ejector in the heating system; when the temperature change is less than or equal to the preset change amount, prohibiting the adjustment of the steam extraction amount of the heating system and the operating parameters of the ejector in the heating system.

[0009] In an exemplary embodiment, after the circulating water of the second temperature value is transmitted to the exhaust steam heat recovery heat exchanger for heat recovery, the above method also includes: determining the real-time flow value of the exhaust steam heat recovery heat exchanger for heat recovery; when the real-time flow value is greater than the target flow value corresponding to the circulating water of the second temperature value, determining the amount of steam extraction to be increased by the heating system according to the flow difference between the real-time flow value and the target flow value; when the real-time flow value is less than the target flow value corresponding to the circulating water of the second temperature value, determining the amount of steam extraction to be reduced by the heating system according to the flow difference between the real-time flow value and the target flow value; when the real-time flow value is equal to the target flow value corresponding to the circulating water of the second temperature value, maintaining the total amount of circulating water in the heating system unchanged.

[0010] In an exemplary embodiment, when the first temperature value is greater than the preset temperature value of the cold user or the air source heat exchanger, the circulating water is subjected to secondary heat exchange treatment to obtain the circulating water of the second temperature value, and the above method also includes: obtaining the real-time load condition of the heating system; when the load condition does not meet the preset safe load condition, determining that the heating system is operating abnormally, and sending abnormal prompt information of the condition to be adjusted to the management object of the heating system; when the load condition meets the preset safe load condition, determining that the heating system is operating normally, and sending a normal prompt information to keep the condition unchanged to the management object of the heating system.

[0011] In an exemplary embodiment, before obtaining the first temperature value of the circulating water in the heating system after passing through the primary heat network heat exchanger, the above method also includes: determining the season information corresponding to the operation of the heating system; when the season information indicates that the current operation date node is a non-heating season, increasing the first heat exchange efficiency of the exhaust steam heat recovery heat exchanger in the heating system and the second heat exchange efficiency corresponding to the cold user or air source heat exchanger; when the season information indicates that the current operation date node is a heating season, lowering the first heat exchange efficiency of the exhaust steam heat recovery heat exchanger in the heating system and the second heat exchange efficiency corresponding to the cold user or air source heat exchanger.

[0012] According to another aspect of an embodiment of the present application, a heat recovery device for a heating system is also provided, including: an acquisition module, used to obtain a first temperature value of circulating water in the heating system after passing through a primary heat network heat exchanger; a processing module, used to perform secondary heat exchange treatment on the circulating water when the first temperature value is greater than a preset temperature value of a cold user or an air source heat exchanger, to obtain circulating water with a second temperature value, wherein the first temperature value is greater than the second temperature value; and a transmission module, used to transmit the circulating water with the second temperature value to a waste steam heat recovery heat exchanger for heat recovery.

[0013] According to another aspect of the embodiments of the present application, a computer-readable storage medium is provided, in which a computer program is stored, wherein the computer program is configured to execute the heat recovery method of the heating system described above when running.

[0014] According to another aspect of an embodiment of the present application, an electronic device is provided, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the heat recovery method of the heating system through the computer program.

[0015] According to another aspect of the embodiments of the present application, a computer program product is provided, including a computer program, and when the computer program is executed by a processor, the heat recovery method of the heating system described above is implemented.

[0016] Through this application, the first temperature value of the circulating water in the heating system after passing through the primary heat network heat exchanger is obtained; when the first temperature value is greater than the preset temperature value of the cold user or air source heat exchanger, the circulating water is subjected to secondary heat exchange treatment to obtain circulating water of the second temperature value, wherein the first temperature value is greater than the second temperature value; the circulating water of the second temperature value is transmitted to the exhaust steam heat recovery heat exchanger for heat recovery. The above technical solution solves the problem of being unable to effectively recover and utilize the heat of the circulating water in the heating system. Furthermore, by adjusting the temperature of the circulating water in the heating system and recycling the excess heat in the circulating water, the exhaust steam heat recovery efficiency and the overall energy utilization efficiency can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0018] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0019] Figure 1 It is a hardware structure block diagram of a computer terminal of a heat recovery method for a heating system according to an embodiment of the present application;

[0020] Figure 2 is a flow chart of a heat recovery method for a heating system according to an embodiment of the present application;

[0021] Figure 3 is a schematic structural diagram of a heat recovery system of a heating system according to an embodiment of the present application;

[0022] Figure 4 is a schematic diagram of a heat recovery process of a heating system according to an embodiment of the present application;

[0023] Figure 5 It is a structural block diagram of a heat recovery device of a heating system according to an embodiment of the present application. DETAILED DESCRIPTION

[0024] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0025] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0026] The method embodiments provided in the embodiments of the present application can be executed in a computer terminal, a mobile terminal or a similar computing device. Taking running on a computer terminal as an example, Figure 1 FIG. 1 is a hardware structure block diagram of a computer terminal of a heat recovery method for a heating system according to an embodiment of the present application. Figure 1 As shown, the computer terminal may include one or N ( Figure 1 The computer terminal includes a processor 102 (only one is shown in the figure) (the processor 102 may include but is not limited to a processing device such as a microprocessor (Central Processing Unit, CPU) or a programmable logic device (Field Programmable Gate Array, FPGA)) and a memory 104 for storing data, wherein the computer terminal may also include a transmission device 106 and an input / output device 108 for communication functions. It can be understood by those skilled in the art that Figure 1 The structure shown is only for illustration and does not limit the structure of the above-mentioned computer terminal. Figure 1 More or fewer components as shown, or with Figure 1 Different configurations are shown.

[0027] The memory 104 can be used to store computer programs, for example, software programs and modules of application software, such as the computer program corresponding to the adjustment method of the monitoring network point in the embodiment of the present application. The processor 102 executes various functional applications and data processing by running the computer program stored in the memory 104, that is, to implement the above method. The memory 104 may include a high-speed random access memory, and may also include a non-volatile memory, such as one or N magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some examples, the memory 104 may further include a memory remotely arranged relative to the processor 102, and these remote memories may be connected to the computer terminal via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0028] The transmission device 106 is used to receive or send data via a network. The specific example of the above network may include a wireless network provided by a communication provider of a computer terminal. In one example, the transmission device 106 includes a network adapter (Network Interface Controller, referred to as NIC), which can be connected to other network devices through a base station so as to communicate with the Internet. In one example, the transmission device 106 can be a radio frequency (RF) module, which is used to communicate with the Internet wirelessly.

[0029] In this embodiment, a heat recovery method for a heating system is provided. Figure 2 is a flow chart of a heat recovery method for a heating system according to an embodiment of the present application. Figure 2 As shown, the process includes the following steps S202-S206:

[0030] Step S202: obtaining a first temperature value of circulating water in the heating system after passing through a primary heating network heat exchanger;

[0031] Step S204: When the first temperature value is greater than a preset temperature value of a cold user or an air source heat exchanger, performing a secondary heat exchange process on the circulating water to obtain circulating water of a second temperature value, wherein the first temperature value is greater than the second temperature value;

[0032] Step S206: transmitting the circulating water of the second temperature value to the exhaust steam heat recovery heat exchanger for heat recovery.

[0033] The above steps obtain the first temperature value of the circulating water in the heating system after passing through the primary heat network heat exchanger; when the first temperature value is greater than the preset temperature value of the cold user or air source heat exchanger, the circulating water is subjected to secondary heat exchange treatment to obtain circulating water with a second temperature value, wherein the first temperature value is greater than the second temperature value; the circulating water with the second temperature value is transmitted to the exhaust steam heat recovery heat exchanger for heat recovery. The above technical solution solves the problem of being unable to effectively recover and utilize the heat of the circulating water in the heating system. Furthermore, by adjusting the temperature of the circulating water in the heating system and recovering and utilizing the excess heat in the circulating water, the exhaust steam heat recovery efficiency and the overall energy utilization efficiency can be improved.

[0034] In an exemplary embodiment, after obtaining the first temperature value of the circulating water in the heating system after passing through the primary heat network heat exchanger, the method further includes: when the first temperature value is less than or equal to the preset temperature value of the cold user or air source heat exchanger, directly transmitting the circulating water with the first temperature value to the exhaust steam heat recovery heat exchanger for heat recovery; and determining the water temperature that is allowed to be increased when the secondary flow inlet of the ejector is working based on the heat recovery result.

[0035] Optionally, in the above embodiment, if the preset minimum cooling demand temperature of the cold user is 15°C. When the first temperature value of the circulating water is 10°C, the system determines that this temperature is lower than the cold user demand, so the circulating water will not be first transmitted to the cold user or the air source heat exchanger, but will be directly guided to the exhaust steam heat recovery heat exchanger. In the exhaust steam heat recovery heat exchanger, the circulating water absorbs the waste heat of the exhaust steam and the temperature rises to 20°C. At this time, the system determines that the water temperature allowed to be increased when the secondary flow inlet of the ejector is working is 22°C based on the heat energy recovery efficiency of the exhaust steam heat recovery heat exchanger and the change in the circulating water temperature. This means that after the circulating water flows out of the exhaust steam heat recovery heat exchanger, its temperature can be adjusted to 22°C to meet the requirements of subsequent processes while avoiding energy waste caused by excessively high water temperature. The above steps ensure the effective recovery and utilization of thermal energy and improve energy utilization efficiency.

[0036] In an exemplary embodiment, after obtaining the first temperature value of the circulating water in the heating system after passing through the primary heat network heat exchanger, the method further includes: monitoring the temperature change of the first temperature value within the target cycle, wherein the temperature change is used to indicate the difference between the maximum temperature value and the minimum temperature value within the target cycle; when the temperature change is greater than a preset change amount, adjusting the steam extraction amount of the heating system and the operating parameters of the ejector in the heating system; when the temperature change is less than or equal to the preset change amount, prohibiting the adjustment of the steam extraction amount of the heating system and the operating parameters of the ejector in the heating system.

[0037] Optionally, in a heating system of a thermal power plant, assuming that the preset change amount is 5°C, the target cycle is set to monitor once every hour. During the operation of the system, it is monitored that the temperature of the circulating water rises from 18°C ​​to 24°C within one hour, and the temperature change amount is 6°C, which exceeds the preset change amount. The system automatically adjusts to reduce the steam extraction amount and adjusts the working parameters of the ejector to reduce the temperature rise rate of the circulating water and ensure that the temperature of the heat recovery process is controlled within a reasonable range. On the contrary, if the system monitors that the temperature of the circulating water changes from 18°C ​​to 19°C in another hour, the temperature change amount is 1°C, which is less than the preset change amount (5°C). In this case, the system automatically prohibits the adjustment of the steam extraction amount and the working parameters of the ejector to keep the current operating state unchanged. The above embodiment ensures the efficient and stable operation of the heating system based on the monitoring of the circulating water temperature change amount and the judgment of the preset conditions, while reducing the operation and maintenance costs and energy loss.

[0038] In an exemplary embodiment, after the circulating water of the second temperature value is transmitted to the exhaust steam heat recovery heat exchanger for heat recovery, the above method also includes: determining the real-time flow value of the exhaust steam heat recovery heat exchanger for heat recovery; when the real-time flow value is greater than the target flow value corresponding to the circulating water of the second temperature value, determining the amount of steam extraction to be increased by the heating system according to the flow difference between the real-time flow value and the target flow value; when the real-time flow value is less than the target flow value corresponding to the circulating water of the second temperature value, determining the amount of steam extraction to be reduced by the heating system according to the flow difference between the real-time flow value and the target flow value; when the real-time flow value is equal to the target flow value corresponding to the circulating water of the second temperature value, maintaining the total amount of circulating water in the heating system unchanged.

[0039] Optionally, in a thermal power plant heating system, the target cycle is set to every 10 minutes and the target flow value is 15000m 3 / h to meet the preset heat load requirements. The second temperature value is set to 25°C, which is related to the circulating water temperature and is used to determine the target flow value. If the system monitors that the real-time flow value of the exhaust steam heat recovery heat exchanger in a 10-minute period is 18000m 3 / h, greater than the target flow value of 15000m 3 / h. The system then calculates the flow rate difference between the real-time flow rate and the target flow rate by 3000m 3 / h, determine the amount of steam extraction to be increased in the heating system to appropriately increase the heat recovery efficiency of the exhaust steam heat recovery heat exchanger. If the system monitors that the real-time flow value of the exhaust steam heat recovery heat exchanger in a 10-minute period is 12000m 3 / h, less than the target flow value of 15000m 3 / h. At this time, the system calculates the flow difference between the real-time flow value and the target flow value by 3000m 3 / h, determine the amount of steam extraction to be reduced in the heating system to adjust the heat recovery efficiency of the exhaust steam heat recovery heat exchanger to a more appropriate level. When the real-time flow value is equal to the target flow value, that is, the real-time flow value of the exhaust steam heat recovery heat exchanger in a certain 10-minute period is 15000m 3 / h, which is consistent with the target flow value. In this case, the system maintains the total amount of circulating water in the heating system unchanged. The above embodiment, based on the dynamic adjustment step of comparing the real-time flow value with the target flow value, ensures the accurate matching of heat recovery and heat load demand, and improves energy utilization efficiency and system stability.

[0040] In an exemplary embodiment, when the first temperature value is greater than the preset temperature value of the cold user or the air source heat exchanger, the circulating water is subjected to secondary heat exchange treatment to obtain the circulating water of the second temperature value, and the above method also includes: obtaining the real-time load condition of the heating system; when the load condition does not meet the preset safe load condition, determining that the heating system is operating abnormally, and sending abnormal prompt information of the condition to be adjusted to the management object of the heating system; when the load condition meets the preset safe load condition, determining that the heating system is operating normally, and sending a normal prompt information to keep the condition unchanged to the management object of the heating system.

[0041] Optionally, in a heating system of a thermal power plant, the preset safe load condition is that the system load is between 75% and 95%, and the working parameters of each key component of the system (such as ejector, heat storage buffer tank, etc.) are within the normal range. If the system monitors that the real-time load condition is 82%, the water temperature of the heat storage buffer tank is 45°C, and the working pressure and flow of the ejector are within the normal range. Since these data meet the preset safe load condition conditions, the system determines that the operating state is normal and automatically sends a normal prompt message of "maintaining the working condition unchanged" to the control center of the thermal power plant. If the system monitors that the real-time load condition suddenly drops to 60%, which is lower than the preset safety lower limit. At the same time, the system detects that the working pressure of the ejector increases abnormally and exceeds the safety range. In this case where the preset safety conditions are not met, the system immediately determines that the operation is abnormal and sends an abnormal prompt message of "conditions to be adjusted" to the control center. Through the above steps, the heating system can not only automatically identify and respond to abnormal conditions, but also reduce unnecessary adjustments during normal operation, thereby achieving a dual improvement in operating efficiency and safety.

[0042] In an exemplary embodiment, before obtaining the first temperature value of the circulating water in the heating system after passing through the primary heat network heat exchanger, the above method also includes: determining the season information corresponding to the operation of the heating system; when the season information indicates that the current operation date node is a non-heating season, increasing the first heat exchange efficiency of the exhaust steam heat recovery heat exchanger in the heating system and the second heat exchange efficiency corresponding to the cold user or air source heat exchanger; when the season information indicates that the current operation date node is a heating season, lowering the first heat exchange efficiency of the exhaust steam heat recovery heat exchanger in the heating system and the second heat exchange efficiency corresponding to the cold user or air source heat exchanger.

[0043] Optionally, when a heating system of a thermal power plant is operating in a non-heating season (e.g., summer), the system recognizes that the current season is non-heating, and then increases the first heat exchange efficiency of the exhaust steam heat recovery heat exchanger to 85%, while increasing the second heat exchange efficiency of the cold user heat exchanger to 90%. This adjustment enables the system to efficiently recover and utilize waste heat in exhaust steam in summer, such as for air conditioning cooling or preheating production water in the plant area, reducing additional energy consumption and improving energy recovery and utilization. When entering the heating season (e.g., winter), the system recognizes that the current season is heating, and automatically lowers the first heat exchange efficiency of the exhaust steam heat recovery heat exchanger to 70%, while reducing the second heat exchange efficiency of the cold user or air source heat exchanger to 75%. The purpose of this adjustment is to reduce excessive recovery of exhaust steam waste heat in the heating season, avoid excessive temperature increases in the heating network, and reduce the condensation burden of the cold user heat exchanger, ensuring that the heating network can stably supply the required heat, while reducing operating energy consumption and costs. Through this mechanism of dynamically adjusting heat exchange efficiency, the system can flexibly adjust its operating strategy between seasons to respond to seasonal heat load demands in the best state, while maximizing energy utilization efficiency and reducing unnecessary operating costs.

[0044] Obviously, the embodiments described above are only some embodiments of the present application, not all embodiments. In order to better understand the method, the above process is described below in conjunction with the embodiments, but it is not intended to limit the technical solutions of the embodiments of the present application, specifically:

[0045] The optional embodiment of the present application provides a heat recovery method for a heating system to solve the problem that the heat of the circulating water in the heating system cannot be effectively recovered and utilized. Specifically, after the exhaust steam is discharged from the exhaust equipment, it does not directly enter the condenser, but passes through the exhaust steam heat recovery heat exchanger to transfer the heat therein to the circulating water. Subsequently, when the temperature of the heated circulating water is higher than the preset temperature value of the cold user or the air source heat exchanger, it will enter the cold user / air source heat exchanger for secondary heat exchange treatment, and release excess heat to meet the needs of the cold user or preheat the air. Next, the temperature-adjusted circulating water passes through the heat storage heat exchanger and exchanges heat with the water in the heat storage buffer tank to store the heat for emergency use. When it is necessary to supply heat to the outside world, the hot water in the heat storage buffer tank is sent to the primary heat network heat exchanger, and heat is exchanged with the incoming water from the primary heat network, and the heat in the heat storage buffer tank is efficiently transferred to the water supply of the primary heat network, thereby increasing its temperature and then supplying it to the heat user. This process not only recovers the waste heat of the exhaust steam, but also realizes the flexible supply of cold and hot energy through the interaction of the heat storage buffer tank and the cold user / air source heat exchanger, ensuring the efficient operation of the system and the rational use of energy.

[0046] As an optional implementation, Figure 3 It is a schematic diagram of the structure of a heat recovery system of a heating system according to an embodiment of the present application. The system at least includes: an exhaust steam heat recovery heat exchanger 32, a cold user / air source heat exchanger 34, and a primary heat network heat exchanger 36.

[0047] Optional, exhaust steam heat recovery heat exchanger 32. The exhaust steam heat recovery heat exchanger is a key device for extracting heat from exhaust steam. In a thermal power plant, the exhaust steam (usually the steam discharged from the low-pressure cylinder) has a low temperature and pressure, but still carries a large amount of heat energy. Before entering the condenser, the exhaust steam first passes through the exhaust steam heat recovery heat exchanger to transfer the heat therein to the circulating water (or working water), thereby recovering the heat energy and reducing energy waste.

[0048] Optionally, a cold user / air source heat exchanger 34. The cold user / air source heat exchanger is a device used to provide cold energy to cold users or to preheat the working water using an air source. When there is a demand for cold energy, the circulating water has a higher temperature after receiving heat from the exhaust steam heat recovery heat exchanger. At this time, this part of hot water can be passed through the cold user / air source heat exchanger to exchange heat with the cold user or air to meet the cooling needs of the cold users in the cold and hot supply system. When the heat pump is working in the cooling mode, the circulating water is cooled here and then circulated to the exhaust steam heat recovery heat exchanger to support the stable operation of the equivalent heat pump cycle. In winter or when the working water needs to be preheated, the heat exchanger can use the heat of the air to preheat the working water to improve the overall efficiency of the system.

[0049] Optionally, a primary heat network heat exchanger 36. In the primary heat network heat exchanger, the hot water in the hot water storage tank exchanges heat with the primary network water supply, and transfers heat to the primary network water supply for external heating services. The temperature of the hot water after heat exchange is reduced and then sent back to the heat storage buffer tank for subsequent use or reheating.

[0050] Optional, Figure 4 1 is a schematic diagram of a heat recovery process of a heating system according to an embodiment of the present application, which specifically includes the following steps:

[0051] Step 1: Recovery of exhaust steam heat energy. After exhaust steam is discharged from the low-pressure cylinder, its temperature has been greatly reduced, but it still carries a certain amount of heat energy. The exhaust steam is first directed to the exhaust steam heat recovery heat exchanger, where the exhaust steam transfers the remaining heat to the circulating water. After the circulating water absorbs the heat of the exhaust steam, its temperature rises, and the exhaust steam is cooled, and then enters the condenser to prepare for condensation. This step is to recover and utilize heat energy that would otherwise be wasted, increasing energy utilization efficiency.

[0052] Step 2: Temperature regulation of circulating water and supply of cold energy. The temperature of the heated circulating water may be higher than the preset temperature of the cold user / air source heat exchanger set by the system. If the system currently needs cooling, the circulating water will be directed to the cold user / air source heat exchanger to directly exchange heat with the cold user, or to exchange heat with the outside air. In this process, the circulating water releases heat and the temperature drops, providing cold energy for the user to meet air conditioning or cooling needs. Conversely, if the outside air temperature is low, the air source heat exchanger can be used to preheat the circulating water to increase its temperature in preparation for subsequent heat energy supply.

[0053] Step 3: Storage of thermal energy and heating of primary heat network water supply. When the system needs to store heat or increase the temperature of the primary heat network water supply, the temperature-regulated circulating water enters the heat storage heat exchanger and exchanges heat with the water in the heat storage buffer tank. The water in the heat storage buffer tank absorbs the heat of the circulating water, and the temperature rises, completing the short-term storage of thermal energy. When the demand for heating increases, the hot water in the heat storage buffer tank is sent to the primary heat network heat exchanger to further heat the primary heat network water returned from the heat network and increase its temperature to meet the needs of external heat users.

[0054] Step 4: Heat supply and system adjustment of the primary heat network. In the primary heat network heat exchanger, the hot water in the heat storage buffer tank exchanges heat with the water from the primary heat network, which increases the temperature of the primary heat network water supply, and then supplies it to external heat users to meet the heating demand. After the primary heat network water supply transfers heat to the heat user, the temperature decreases and becomes the return water of the primary heat network, which returns to the system to continue circulating. According to the real-time heat load, electricity price and unit output, the system will adjust the operating mode and flexibly switch to heat storage, heating or cooling mode by controlling the opening and closing of specific valves to achieve the best utilization of energy and optimization of economic benefits.

[0055] It should be noted that when the exhaust steam and circulating water are exchanging heat, it is necessary to ensure that the contact area and time between the two are sufficient to achieve effective heat transfer. At the same time, when designing the heat exchanger, it is necessary to consider the impact of temperature difference and pressure drop on the heat exchange efficiency, avoid excessive pressure drop affecting the flow of exhaust steam, and prevent excessive temperature difference from causing excessive thermal stress in the heat exchanger. Exhaust steam may contain corrosive substances or scale. The exhaust steam heat recovery heat exchanger should be maintained and cleaned regularly to maintain its good heat exchange performance. Secondly, when supplying water to the primary heating network, precise temperature and flow regulation is required to ensure a smooth supply of heat energy and avoid adverse effects of temperature fluctuations in the heating network on heat users. In addition, in the cooling mode, attention should be paid to the difference between the circulating water temperature and the cold user temperature to avoid condensation caused by excessive temperature difference, which will affect the operating efficiency of the equipment and the comfort of the cold users.

[0056] In summary, the optional embodiments of the present application realize multi-level utilization of energy through the coordinated work of the exhaust steam heat recovery heat exchanger, the cold user / air source heat exchanger and the primary heat network heat exchanger, that is, first the exhaust steam heat is recovered, then the cold and heat conversion is performed according to the demand, and finally the heat energy is supplied to the external users through the primary heat network. Specifically, after the exhaust steam works in the low-pressure cylinder, it does not condense immediately, but first transfers the remaining heat energy to the circulating water through the exhaust steam heat recovery heat exchanger to heat the circulating water. When the circulating water temperature exceeds the set value of the cold user or air source heat exchanger, it will enter these heat exchangers to release excess heat to meet the cooling demand or preheat the air, and adjust itself to a moderate temperature. Subsequently, the circulating water exchanges heat with the water in the heat storage buffer tank in the heat storage heat exchanger to store the heat energy. When heating is required, the hot water in the heat storage buffer tank heats the primary heat network supply water through the primary heat network heat exchanger to increase its temperature and finally supply it to the heat user. The entire system achieves closed-loop utilization of energy through the coordinated work of various components, improves energy utilization efficiency, and also enhances the adaptability and flexibility of the thermal power plant to changes in energy supply and demand.

[0057] Through the description of the above implementation methods, those skilled in the art can clearly understand that the method according to the above embodiment can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present application, or the part that contributes to the prior art, can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk), and includes a number of instructions for a terminal device (which can be a mobile phone, computer, server, or network device, etc.) to execute the methods of each embodiment of the present application.

[0058] In this embodiment, a heat recovery device for a heating system is also provided, which is used to implement the above-mentioned embodiments and preferred implementation modes, and the descriptions that have been made are omitted. As used below, the term "module" can be a combination of software and / or hardware that implements a predetermined function. Although the devices described in the following embodiments are preferably implemented in software, the implementation of hardware, or a combination of software and hardware, is also possible and conceivable.

[0059] Figure 5 : is a structural block diagram of a heat recovery device for a heating system according to an embodiment of the present application, the device comprising:

[0060] An acquisition module 52 is used to acquire a first temperature value of circulating water in the heating system after passing through a heat exchanger of a primary heating network;

[0061] A processing module 54 is used to perform secondary heat exchange processing on the circulating water to obtain circulating water with a second temperature value when the first temperature value is greater than a preset temperature value of a cold user or an air source heat exchanger, wherein the first temperature value is greater than the second temperature value;

[0062] The first transmission module 56 is used to transmit the circulating water of the second temperature value to the exhaust steam heat recovery heat exchanger for heat recovery.

[0063] The above device obtains the first temperature value of the circulating water in the heating system after passing through the primary heat network heat exchanger; when the first temperature value is greater than the preset temperature value of the cold user or air source heat exchanger, the circulating water is subjected to secondary heat exchange treatment to obtain circulating water of a second temperature value, wherein the first temperature value is greater than the second temperature value; the circulating water of the second temperature value is transmitted to the exhaust steam heat recovery heat exchanger for heat recovery. The above technical solution solves the problem of being unable to effectively recover and utilize the heat of the circulating water in the heating system. Furthermore, by adjusting the temperature of the circulating water in the heating system and recovering and utilizing the excess heat in the circulating water, the exhaust steam heat recovery efficiency and the overall energy utilization efficiency can be improved.

[0064] In an exemplary embodiment, the above-mentioned device also includes: a second transmission module, which is used to obtain the first temperature value of the circulating water in the heating system after passing through the primary heat network heat exchanger, and when the first temperature value is less than or equal to the preset temperature value of the cold user or air source heat exchanger, directly transmit the circulating water with the first temperature value to the exhaust steam heat recovery heat exchanger for heat recovery; based on the heat recovery result, determine the water temperature that is allowed to be increased when the secondary flow inlet of the ejector is working.

[0065] In an exemplary embodiment, the above-mentioned device also includes: a monitoring module, which is used to obtain the first temperature value of the circulating water in the heating system after passing through the primary heat network heat exchanger, and monitor the temperature change of the first temperature value within the target cycle, wherein the temperature change is used to indicate the difference between the maximum temperature value and the minimum temperature value within the target cycle; when the temperature change is greater than the preset change amount, adjust the steam extraction amount of the heating system and the working parameters of the ejector in the heating system; when the temperature change is less than or equal to the preset change amount, it is prohibited to adjust the steam extraction amount of the heating system and the working parameters of the ejector in the heating system.

[0066] In an exemplary embodiment, the above-mentioned device also includes: a determination module, which is used to determine the real-time flow value of the exhaust steam heat recovery heat exchanger for heat recovery after the circulating water of the second temperature value is transmitted to the exhaust steam heat recovery heat exchanger for heat recovery; when the real-time flow value is greater than the target flow value corresponding to the circulating water of the second temperature value, the amount of steam extraction to be increased in the heating system is determined according to the flow difference between the real-time flow value and the target flow value; when the real-time flow value is less than the target flow value corresponding to the circulating water of the second temperature value, the amount of steam extraction to be reduced in the heating system is determined according to the flow difference between the real-time flow value and the target flow value; when the real-time flow value is equal to the target flow value corresponding to the circulating water of the second temperature value, the total amount of circulating water in the heating system is maintained unchanged.

[0067] In an exemplary embodiment, the above-mentioned device also includes: a sending module, which is used to perform secondary heat exchange treatment on the circulating water when the first temperature value is greater than the preset temperature value of the cold user or the air source heat exchanger, and obtain the real-time load condition of the heating system before obtaining the circulating water of the second temperature value; when the load condition does not meet the preset safe load condition, it is determined that the heating system is operating abnormally, and an abnormal prompt information of the condition to be adjusted is sent to the management object of the heating system; when the load condition meets the preset safe load condition, it is determined that the heating system is operating normally, and a normal prompt information of keeping the condition unchanged is sent to the management object of the heating system.

[0068] In an exemplary embodiment, the above-mentioned device also includes: an adjustment module, which is used to determine the corresponding season information when the heating system is in operation before obtaining the first temperature value of the circulating water in the heating system after passing through the primary heat network heat exchanger; when the season information indicates that the current operating date node is a non-heating season, increase the first heat exchange efficiency of the exhaust steam heat recovery heat exchanger in the heating system and the second heat exchange efficiency corresponding to the cold user or air source heat exchanger; when the season information indicates that the current operating date node is a heating season, reduce the first heat exchange efficiency of the exhaust steam heat recovery heat exchanger in the heating system and the second heat exchange efficiency corresponding to the cold user or air source heat exchanger.

[0069] An embodiment of the present application further provides a computer-readable storage medium, in which a computer program is stored, wherein the computer program is configured to execute the steps of any of the above method embodiments when running.

[0070] Optionally, in this embodiment, the storage medium may be configured to store a computer program for performing the following steps:

[0071] S1, obtaining a first temperature value of circulating water in a heating system after passing through a primary heat network heat exchanger;

[0072] S2. When the first temperature value is greater than a preset temperature value of a cold user or an air source heat exchanger, performing a secondary heat exchange process on the circulating water to obtain circulating water of a second temperature value, wherein the first temperature value is greater than the second temperature value;

[0073] S3. Transmit the circulating water at the second temperature value to the exhaust steam heat recovery heat exchanger for heat recovery.

[0074] In an exemplary embodiment, the computer-readable storage medium may include, but is not limited to, various media that can store computer programs, such as a USB flash drive, a read-only memory (ROM), a random access memory (RAM), a mobile hard disk, a magnetic disk or an optical disk.

[0075] For specific examples in this embodiment, reference may be made to the examples described in the above embodiments and exemplary implementation modes, and this embodiment will not be described in detail herein.

[0076] An embodiment of the present application further provides a computer program product, including a computer program, and when the computer program is executed by a processor, the steps in any one of the above method embodiments are performed.

[0077] An embodiment of the present application further provides another computer program product, including a non-volatile computer-readable storage medium, wherein the non-volatile computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps in any of the above method embodiments are implemented.

[0078] An embodiment of the present application further provides an electronic device, including a memory and a processor, wherein a computer program is stored in the memory, and the processor is configured to run the computer program to execute the steps in any one of the above method embodiments.

[0079] Optionally, in this embodiment, the processor may be configured to perform the following steps through a computer program:

[0080] S1, obtaining a first temperature value of circulating water in a heating system after passing through a primary heat network heat exchanger;

[0081] S2. When the first temperature value is greater than a preset temperature value of a cold user or an air source heat exchanger, performing a secondary heat exchange process on the circulating water to obtain circulating water of a second temperature value, wherein the first temperature value is greater than the second temperature value;

[0082] S3. Transmit the circulating water at the second temperature value to the exhaust steam heat recovery heat exchanger for heat recovery.

[0083] In an exemplary embodiment, the electronic device may further include a transmission device and an input / output device, wherein the transmission device is connected to the processor, and the input / output device is connected to the processor.

[0084] For specific examples in this embodiment, reference may be made to the examples described in the above embodiments and exemplary implementation modes, and this embodiment will not be described in detail herein.

[0085] Obviously, those skilled in the art should understand that the above modules or steps of the present application can be implemented by a general computing device, they can be concentrated on a single computing device, or distributed on a network composed of N computing devices, they can be implemented by a program code executable by a computing device, so that they can be stored in a storage device and executed by the computing device, and in some cases, the steps shown or described can be executed in a different order from that here, or they can be made into individual integrated circuit modules, or N of the modules or steps can be made into a single integrated circuit module for implementation. In this way, the present application is not limited to any specific combination of hardware and software.

[0086] The above is only a preferred implementation of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A heat recovery method for a heating system, characterized in that: include: Obtaining a first temperature value of circulating water in the heating system after passing through a primary heat network heat exchanger; When the first temperature value is greater than a preset temperature value of a cold user or an air source heat exchanger, the circulating water is subjected to a secondary heat exchange process to obtain circulating water of a second temperature value, wherein the first temperature value is greater than the second temperature value; The circulating water at the second temperature value is transmitted to the exhaust steam heat recovery heat exchanger for heat recovery.

2. The heat recovery method of a heating system according to claim 1, characterized in that: After obtaining the first temperature value of the circulating water in the heating system after passing through the primary heat network heat exchanger, the method further includes: When the first temperature value is less than or equal to the preset temperature value of the cold user or air source heat exchanger, the circulating water of the first temperature value is directly transferred to the exhaust steam heat recovery heat exchanger for heat recovery; based on the heat recovery result, the water temperature allowed to be increased when the secondary flow inlet of the ejector is working is determined.

3. The heat recovery method of a heating system according to claim 1, characterized in that: After obtaining the first temperature value of the circulating water in the heating system after passing through the primary heat network heat exchanger, the method further includes: Monitoring a temperature variation of the first temperature value within a target period, wherein the temperature variation is used to indicate a difference between a maximum temperature value and a minimum temperature value within the target period; When the temperature change is greater than a preset change amount, adjusting the steam extraction amount of the heating system and the working parameters of the ejector in the heating system; When the temperature change is less than or equal to the preset change amount, it is prohibited to adjust the steam extraction amount of the heating system and the working parameters of the ejector in the heating system.

4. The heat recovery method of a heating system according to claim 1, characterized in that: After transmitting the circulating water of the second temperature value to the exhaust steam heat recovery heat exchanger for heat recovery, the method further comprises: determining a real-time flow value of the exhaust steam heat recovery heat exchanger for heat recovery; When the real-time flow value is greater than the target flow value corresponding to the circulating water at the second temperature value, determining the amount of steam extraction to be increased in the heating system according to the flow difference between the real-time flow value and the target flow value; When the real-time flow value is less than the target flow value corresponding to the circulating water at the second temperature value, determining the steam extraction amount to be reduced of the heating system according to the flow difference between the real-time flow value and the target flow value; When the real-time flow value is equal to the target flow value corresponding to the circulating water at the second temperature value, the total amount of circulating water in the heating system is maintained unchanged.

5. The heat recovery method of a heating system according to claim 1, characterized in that: When the first temperature value is greater than a preset temperature value of a cold user or an air source heat exchanger, before performing a secondary heat exchange process on the circulating water to obtain circulating water of a second temperature value, the method further comprises: Obtaining the real-time load condition of the heating system; When the load condition does not meet the preset safe load condition, determining that the heating system is operating abnormally, and sending abnormal prompt information of the condition to be adjusted to the management object of the heating system; When the load condition meets the preset safety load condition, it is determined that the heating system is operating normally, and a normal prompt message for keeping the condition unchanged is sent to the management object of the heating system.

6. The heat recovery method of a heating system according to claim 1, characterized in that: Before obtaining the first temperature value of the circulating water in the heating system after passing through the primary heat network heat exchanger, the method further includes: Determine the season information corresponding to the operation of the heating system; When the season information indicates that the current operation date node is a non-heating season, the first heat exchange efficiency of the exhaust steam heat recovery heat exchanger in the heating system and the second heat exchange efficiency corresponding to the cold user or air source heat exchanger are increased; When the season information indicates that the current operating date node is the heating season, the first heat exchange efficiency of the exhaust steam heat recovery heat exchanger in the heating system and the second heat exchange efficiency corresponding to the cold user or air source heat exchanger are lowered.

7. A heat recovery device for a heating system, characterized in that: include: An acquisition module, used for acquiring a first temperature value of circulating water in a heating system after passing through a heat exchanger of a primary heating network; a processing module, configured to perform secondary heat exchange processing on the circulating water to obtain circulating water with a second temperature value when the first temperature value is greater than a preset temperature value of a cold user or an air source heat exchanger, wherein the first temperature value is greater than the second temperature value; The transmission module is used to transmit the circulating water of the second temperature value to the exhaust steam heat recovery heat exchanger for heat recovery.

8. A computer-readable storage medium, characterized in that: The computer-readable storage medium includes a stored program, wherein the program executes the method according to any one of claims 1 to 6 when executed.

9. An electronic device comprising a memory and a processor, characterized in that: A computer program is stored in the memory, and the processor is configured to execute the method according to any one of claims 1 to 6 through the computer program.

10. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, the method according to any one of claims 1 to 6 is implemented.

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