Control method, control module and device for waste heat recovery of heat supply network heating system

Abstract

The invention provides a control method, control module and device for waste heat recovery of a heat supply network heating system, the method is applied to the control module of the device, and the method comprises the steps that the temperature value of first temperature collected by a first temperature sensor is obtained; if the temperature value of the first temperature is larger than or equal to a preset first temperature threshold value, a first group of control signals are generated and controlled to open a first valve and a second valve according to the first group of control signals, and meanwhile, a water pump is controlled to start, so that refrigerant water flowing in from an inlet of a second channel is heated into heat medium water through heat of high-temperature flue gas absorbed from a first channel in the second channel; and the heat medium water is discharged into the third channel from the outlet of the second channel, so that heat supply network return water flowing in from the inlet of the fourth channel is heated as heat supply network feed water in the fourth channel through heat of the heat medium water absorbed from the third channel, and the heat supply network feed water is discharged into a heat supply network water supply pipeline from the outlet of the fourth channel. In this way, the flue gas waste heat is used for providing additional heat energy for heat supply network water supply, and the waste heat recovery efficiency of a heat supply network heating system is improved.

Description

Technical Field

[0001] The present application relates to the field of heating network heating technology, and in particular to a control method, control module and device for waste heat recovery of a heating network heating system. Background Art

[0002] The heating system of the heating network is a key component of the heating network system. Its main function is to use the steam extracted from the turbine or the steam drawn from the boiler to heat the circulating water in the hot water supply system to meet the needs of heating users.

[0003] The main heat source of the existing heating network system comes from the steam extraction or auxiliary steam of the turbine system. The heat sources are all high-quality thermal energy. Although they can ensure the temperature and pressure requirements of the heating network operation, they also cause a large amount of high-quality thermal energy to be wasted, resulting in low efficiency of waste heat recovery in the heating network heating system. Summary of the invention

[0004] In view of this, the embodiments of the present application at least provide a control method, control module and device for waste heat recovery of a heating network heating system, which utilizes flue gas waste heat to provide additional thermal energy for the heating network water supply, thereby improving the waste heat recovery efficiency of the heating network heating system.

[0005] This application mainly includes the following aspects:

[0006] In a first aspect, an embodiment of the present application provides a control method for waste heat recovery of a heating network heating system, which is applied to a control module of a control device for waste heat recovery of a heating network heating system, wherein the control device comprises a first heat exchanger, a second heat exchanger, a first valve, a second valve, a water pump, a first temperature sensor and a control module; the inlet of a first channel of the first heat exchanger is connected to a furnace outlet pipeline of a coal-fired unit of the heating network heating system, the outlet of the first channel is connected to a dust collector pipeline of the heating network heating system, the outlet of the second channel of the first heat exchanger is connected to an inlet pipeline of a third channel of the second heat exchanger through the first valve, and the inlet of the second channel is connected to an outlet pipeline of the third channel through the second valve; the inlet of a fourth channel of the second heat exchanger is connected to a heating network return water pipeline of the heating network heating system, and the outlet of the fourth channel is connected to a heating network water supply pipeline of the heating network heating system; the water pump is located in a pipeline connecting the second channel and the third channel; the first temperature sensor is located in the first channel; the first valve, the second valve, the water pump and the first temperature sensor are electrically connected to the control module respectively; the control method comprises:

[0007] Acquire a temperature value of a first temperature collected by the first temperature sensor; the first temperature is the temperature of high-temperature flue gas discharged from the furnace outlet into the first channel;

[0008] If the temperature value of the first temperature is greater than or equal to a preset first temperature threshold, generating a first set of control signals;

[0009] According to the first group of control signals, the first valve and the second valve are controlled to open, and the water pump is controlled to start at the same time, so that the refrigerant water flowing in from the inlet of the second channel is heated into heat medium water in the second channel by the heat of the high-temperature flue gas absorbed from the first channel, and the heat medium water is discharged from the outlet of the second channel to the third channel, and the hot network return water flowing in from the inlet of the fourth channel is heated into hot network feed water in the fourth channel by the heat of the heat medium water absorbed from the third channel, and the hot network feed water is discharged from the outlet of the fourth channel to the hot network feed water pipeline.

[0010] In a second aspect, an embodiment of the present application further provides a control module, which is applied to a control device for waste heat recovery of a heat network heating system, the control device comprising a first heat exchanger, a second heat exchanger, a first valve, a second valve, a water pump, a first temperature sensor and a control module; the inlet of the first channel of the first heat exchanger is connected to the furnace outlet pipeline of the coal-fired unit of the heat network heating system, the outlet of the first channel is connected to the dust collector pipeline of the heat network heating system, the outlet of the second channel of the first heat exchanger is connected to the inlet pipeline of the third channel of the second heat exchanger through the first valve, and the inlet of the second channel is connected to the outlet pipeline of the third channel through the second valve; the inlet of the fourth channel of the second heat exchanger is connected to the heat network return water pipeline of the heat network heating system, and the outlet of the fourth channel is connected to the heat network water supply pipeline of the heat network heating system; the water pump is located in the pipeline connecting the second channel and the third channel; the first temperature sensor is located in the first channel; the first valve, the second valve, the water pump and the first temperature sensor are electrically connected to the control module respectively; the control module comprises:

[0011] An acquisition unit, configured to acquire a temperature value of a first temperature collected by the first temperature sensor; the first temperature is the temperature of high-temperature flue gas discharged from the furnace outlet into the first channel;

[0012] A first judgment unit, configured to generate a first set of control signals if the temperature value of the first temperature is greater than or equal to a preset first temperature threshold;

[0013] The first control unit is used to control the opening of the first valve and the second valve according to the first group of control signals, and control the start of the water pump at the same time, so that the refrigerant water flowing into the inlet of the second channel is heated into heat medium water in the second channel by the heat of the high-temperature flue gas absorbed from the first channel, and the heat medium water is discharged from the outlet of the second channel to the third channel, and the heat network return water flowing into the inlet of the fourth channel is heated into heat network feed water in the fourth channel by the heat of the heat medium water absorbed from the third channel, and the heat network feed water is discharged from the outlet of the fourth channel to the heat network feed water pipeline.

[0014] In a third aspect, an embodiment of the present application further provides a control device for waste heat recovery of a heat network heating system, the control device comprising a first heat exchanger, a second heat exchanger, a first valve, a second valve, a water pump, a first temperature sensor and a control module in the above-mentioned second aspect or any possible implementation manner of the second aspect; the inlet of the first channel of the first heat exchanger is connected to the furnace outlet pipeline of the coal-fired unit of the heat network heating system, the outlet of the first channel is connected to the dust collector pipeline of the heat network heating system, the outlet of the second channel of the first heat exchanger is connected to the inlet pipeline of the third channel of the second heat exchanger through the first valve, and the inlet of the second channel is connected to the outlet pipeline of the third channel through the second valve; the inlet of the fourth channel of the second heat exchanger is connected to the heat network return water pipeline of the heat network heating system, and the outlet of the fourth channel is connected to the heat network water supply pipeline of the heat network heating system; the water pump is located in the pipeline connecting the second channel and the third channel; the first temperature sensor is located in the first channel; the first valve, the second valve, the water pump and the first temperature sensor are electrically connected to the control module respectively.

[0015] In a fourth aspect, an embodiment of the present application further provides an electronic device, comprising: a processor, a memory and a bus, wherein the memory stores machine-readable instructions executable by the processor, and when the electronic device is running, the processor and the memory communicate through the bus, and the machine-readable instructions are executed by the processor to execute the steps of the control method for waste heat recovery of the thermal network heating system as described above.

[0016] In a fifth aspect, an embodiment of the present application further provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps of the control method for waste heat recovery of a thermal network heating system as described above are executed.

[0017] The embodiment of the present application provides a control method, control module and device for waste heat recovery of a heating network heating system, which is applied to a control module of a control device for waste heat recovery of a heating network heating system, wherein the control device comprises a first heat exchanger, a second heat exchanger, a first valve, a second valve, a water pump, a first temperature sensor and a control module; the inlet of the first channel of the first heat exchanger is connected to the furnace outlet pipeline of a coal-fired unit of the heating network heating system, the outlet of the first channel is connected to the dust collector pipeline of the heating network heating system, the outlet of the second channel of the first heat exchanger is connected to the inlet pipeline of the third channel of the second heat exchanger through the first valve, and the inlet of the second channel is connected to the outlet pipeline of the third channel through the second valve; the inlet of the fourth channel of the second heat exchanger is connected to the heating network return water pipeline of the heating network heating system, and the outlet of the fourth channel is connected to the heating network water supply pipeline of the heating network heating system; the water pump is located in the pipeline connecting the second channel and the third channel; the first temperature The sensor is located in the first channel; the first valve, the second valve, the water pump and the first temperature sensor are electrically connected to the control module respectively; the control method includes: obtaining the temperature value of the first temperature collected by the first temperature sensor; the first temperature is the temperature of the high-temperature flue gas discharged from the furnace outlet into the first channel; if the temperature value of the first temperature is greater than or equal to the preset first temperature threshold, a first group of control signals is generated; according to the first group of control signals, the first valve and the second valve are controlled to open, and the water pump is controlled to start at the same time, so that the refrigerant water flowing in from the inlet of the second channel is heated to heat medium water in the second channel by the heat of the high-temperature flue gas absorbed from the first channel, and the heat medium water is discharged from the outlet of the second channel to the third channel, so that the heat network return water flowing in from the inlet of the fourth channel is heated to heat network feed water in the fourth channel by the heat of the heat medium water absorbed from the third channel, and the heat network feed water is discharged from the outlet of the fourth channel to the heat network feed water pipeline. In this way, the waste heat of flue gas is used to provide additional heat energy for the heat network feed water, thereby improving the waste heat recovery efficiency of the heat network heating system.

[0018] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 One of the structural schematic diagrams of a control device for waste heat recovery of a heating network heating system provided in an embodiment of the present application is shown;

[0021] Figure 2A second structural schematic diagram of a control device for waste heat recovery of a heating network heating system provided in an embodiment of the present application is shown;

[0022] Figure 3 A flow chart showing a control method for waste heat recovery of a heating network heating system provided in an embodiment of the present application is shown;

[0023] Figure 4 One of the functional module diagrams of a control module provided in an embodiment of the present application is shown;

[0024] Figure 5 A second functional module diagram of a control module provided in an embodiment of the present application is shown;

[0025] Figure 6 A schematic structural diagram of an electronic device provided in an embodiment of the present application is shown. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme 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 a part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application usually described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present application.

[0027] The following will be combined with the attached Figure 1 and attached Figure 2 The implementation method of the embodiment of the present application is described in detail; the embodiment of the present application provides a control method for waste heat recovery of a heating network heating system, which is applied to a control module of a control device for waste heat recovery of a heating network heating system.

[0028] See also Figure 1 , Figure 1 This is one of the structural schematic diagrams of a control device for waste heat recovery in a heating network heating system provided in an embodiment of the present application.

[0029] The control method for waste heat recovery of a heating network heating system provided in the embodiment of the present application can be applied to Figure 1In the control module of the control device for waste heat recovery of the heating network heating system shown in the figure, the control device 100 may include: a first heat exchanger 101, a second heat exchanger 102, a first valve 103, a second valve 104, a water pump 105, a first temperature sensor 106 and a control module 107; the inlet of the first channel of the first heat exchanger 101 is connected to the furnace outlet pipeline of the coal-fired unit of the heating network heating system, the outlet of the first channel is connected to the dust collector pipeline of the heating network heating system, and the outlet of the second channel of the first heat exchanger 101 is connected to the second heat exchanger through the first valve 103. The inlet pipeline of the third channel of the heat exchanger 102 is connected, and the inlet of the second channel is connected to the outlet pipeline of the third channel through the second valve 104; the inlet of the fourth channel of the second heat exchanger 102 is connected to the heat network return pipeline of the heat network heating system, and the outlet of the fourth channel is connected to the heat network supply pipeline of the heat network heating system; the water pump 105 is located in the pipeline connecting the second channel and the third channel; the first temperature sensor 106 is located in the first channel; the first valve 103, the second valve 104, the water pump 105 and the first temperature sensor 106 are electrically connected to the control module 107 respectively.

[0030] In the preferred solution 1 of the embodiment of the present application, please refer to Figure 2 , Figure 2 This is a second structural diagram of a control device for waste heat recovery of a heating network heating system provided in an embodiment of the present application. Figure 2 As shown, the control device 100 may further include a flow meter 108 ; the flow meter 108 is located in the first channel, and the flow meter 108 is electrically connected to the control module 107 .

[0031] In the preferred solution 2 of the embodiment of the present application, Figure 2 As shown, the control device 100 may also include a second temperature sensor 109 and a heating network water supply mixer 110; the second temperature sensor 109 is located in the fourth channel; the heating network water supply mixer 110 is installed on the heating network water supply pipeline; the second temperature sensor 109 and the heating network water supply mixer 110 are electrically connected to the control module 107 respectively.

[0032] A control method for waste heat recovery of a heating network heating system provided in an embodiment of the present application is described in detail below. The control method for waste heat recovery of a heating network heating system can be applied to a control module of the control device for waste heat recovery of the heating network heating system described above.

[0033] See also Figure 3 , Figure 3 This is a flow chart of a control method for waste heat recovery of a heating network heating system provided in an embodiment of the present application. Figure 3 As shown, the control method for waste heat recovery of a heating network heating system provided in an embodiment of the present application includes the following steps:

[0034] S301, obtaining a temperature value of a first temperature collected by the first temperature sensor; the first temperature is the temperature of high-temperature flue gas discharged from the furnace outlet into the first channel.

[0035] Here, in the existing heating network system, the heat source of the heating network water supply mainly comes from the heating of the coal-fired unit, specifically from the steam discharged from the medium-pressure cylinder exhaust or the medium-low pressure connecting pipe. If the steam is not used for heating, it can also be used to continue to forward the steam turbine of the power generation component to generate electricity, so it belongs to a higher quality heat source. If this higher quality heat source is used to heat the heating network water supply, it will cause a lot of energy waste compared to being used for steam turbine power generation. At the same time, the flue gas waste heat of the coal-fired unit of the heating network system is often directly discharged into the atmosphere through the chimney, which will also cause a lot of energy waste. Therefore, the embodiment of the present application uses the flue gas waste heat as a low-quality heat source to replace the higher quality heat sources such as the steam discharged from the medium-pressure cylinder exhaust or the medium-low pressure connecting pipe to heat the heating network water supply, which greatly saves the energy consumption of the heating network system, and can also reduce the overall coal consumption of the coal-fired unit, and improve the waste heat recovery efficiency of the heating network system. Specifically, the first temperature sensor 106 monitors the temperature of the high-temperature flue gas discharged from the furnace outlet of the coal-fired unit of the heating network system in real time, and transmits the temperature value to the control module 107. The control module 107 analyzes the received temperature value for subsequent waste heat recovery control.

[0036] S302: If the temperature value of the first temperature is greater than or equal to a preset first temperature threshold, generate a first set of control signals.

[0037] Here, the control module 107 compares the collected temperature value of the first temperature with the preset first temperature threshold. If the temperature value of the first temperature reaches or exceeds the first temperature threshold, it means that the high-temperature flue gas discharged from the furnace outlet of the coal-fired unit has sufficient heat for recovery, and the control module 107 immediately generates a first set of control signals to start the control of the waste heat recovery of the high-temperature flue gas. At the same time, in the heating system of the heat network, the high-temperature flue gas discharged from the furnace outlet of the coal-fired unit needs to be dedusted by a dust collector before being discharged into the atmosphere through the chimney, so the temperature value of the first temperature also needs to be guaranteed to be higher than a certain temperature to maintain the gas form of the high-temperature flue gas, and prevent the liquefaction of the flue gas after heat recovery from causing damage to the dust collector. Therefore, the setting of the first temperature threshold needs to take into account both the heating needs of the heat network and the dust removal needs of the high-temperature flue gas.

[0038] S303, according to the first group of control signals, control the first valve and the second valve to open, and control the water pump to start at the same time, so that the refrigerant water flowing in from the inlet of the second channel is heated into heat medium water in the second channel by the heat of the high-temperature flue gas absorbed from the first channel, and the heat medium water is discharged from the outlet of the second channel to the third channel, and the hot network return water flowing in from the inlet of the fourth channel is heated into hot network feed water in the fourth channel by the heat of the heat medium water absorbed from the third channel, and the hot network feed water is discharged from the outlet of the fourth channel to the hot network feed water pipeline.

[0039] Here, the control device 100 is divided into two states: operation and shutdown. The control module 107 opens the first valve 103 and the second valve 104 according to the first group of control signals, so that the refrigerant water can flow in from the second channel, and exchange heat with the high-temperature flue gas through the first heat exchanger 101, and become heat medium water after absorbing heat. At the same time, the water pump 105 is started to ensure that the refrigerant water flows smoothly between the second channel and the third channel, and the control device 100 is in operation. At this time, the heat medium water continues to flow in the third channel, exchanges heat with the heat network return water in the fourth channel, transfers heat to the heat network return water, and heats it up to become the heat network feed water. The heated heat network feed water is discharged from the outlet of the fourth channel and enters the heat network feed water pipeline to achieve heat network heating. In the embodiment of the present application, the first heat exchanger 101 and the second heat exchanger 102 are both surface heat exchange devices. The first heat exchanger 101 needs to use 304 or above corrosion-resistant steel to adapt to low temperature (below 120°C), high sulfur (liquid sulfuric acid), and high dust flue gas environments; the second heat exchanger 102 can use ordinary pressure-bearing heat exchange equipment.

[0040] Furthermore, the control method further includes:

[0041] Step a1: if the temperature value of the first temperature is less than the first temperature threshold, generate a second set of control signals.

[0042] Here, if the control module 107 detects that the temperature value of the first temperature is lower than the first temperature threshold, it means that the heat of the current high-temperature flue gas is insufficient to effectively recover waste heat and may cause damage to the system's dust collector. Therefore, the control module 107 generates a second set of control signals to adjust the control device 100 to a shutdown state, and continue to heat the heat network through a high-quality heat source.

[0043] Step a2: According to the second group of control signals, the first valve and the second valve are controlled to be closed, and the water pump is controlled to be closed at the same time.

[0044] Here, according to the second set of control signals, the first valve 103 and the second valve 104 are closed to cut off the flow path of the refrigerant water and the heat medium water to prevent unnecessary heat loss. At the same time, the water pump 105 is turned off to stop the circulation of the refrigerant water in the system, further reducing energy consumption.

[0045] Furthermore, if the temperature value of the first temperature is greater than a preset second temperature threshold, after controlling the first valve and the second valve to open and controlling the water pump to start according to the first group of control signals, the control method further includes:

[0046] Step b1, determining a first flow rate value of a target water flow rate according to the temperature value of the first temperature and a first preset mapping relationship; the first preset mapping relationship is a mapping relationship between the target water flow rate and the first temperature, and the target water flow rate is the flow rate of the refrigerant water flowing into the inlet of the second channel; the first flow rate value is the target water flow rate required to reduce the temperature value of the first temperature to the second temperature threshold under the conditions of the temperature value of the first temperature and a preset time threshold.

[0047] Here, under the background of frequent low-load operation and peak-shaving of coal-fired units, the exhaust gas temperature at the furnace outlet is often too high, resulting in the unit being in an undesigned normal operating state at this time, and the high-temperature flue gas flowing into the tail equipment will cause the wall temperature of the tail equipment to be too high. For example, the bag filter inlet allows the temperature to exceed the limit, which will cause the bag to burn and cannot be used. Therefore, when the control device 100 is in operation, it is also necessary to consider the problem of excessive temperature of the high-temperature flue gas brought about by the peak-shaving condition of the coal-fired unit. Therefore, when the control module 107 detects that the temperature value of the first temperature is greater than the preset second temperature threshold, the control module 107 calculates the target water flow rate required to reduce the temperature of the high-temperature flue gas from the temperature value of the first temperature to the second temperature threshold under the conditions of the temperature value of the first temperature and the preset first preset mapping relationship, that is, the water flow rate of the refrigerant water flowing in from the inlet of the second channel. Among them, the first preset mapping relationship is a mapping relationship between the target water flow rate and the first temperature, which can be pre-established based on system design parameters and experimental data, and the second temperature threshold and the preset time threshold are specifically set according to the design parameters of the system, and are not limited here. In this way, the system can ensure that the tail equipment operates within the normal temperature range while making full use of the waste heat of the flue gas, thereby improving the safety performance of the unit operation.

[0048] Step b2: generating a third set of control signals according to the first flow rate value.

[0049] Here, the control module 107 generates a third set of control signals according to the calculated first flow rate value, so as to adjust the target water flow rate.

[0050] Step b3, controlling the operating power of the water pump and the openings of the first valve and the second valve according to the third group of control signals, so as to adjust the target water flow rate to the first flow rate value.

[0051] Here, by adjusting the working power of the water pump 105 and the opening of the first valve 103 and the second valve 104, the target water flow rate reaches the first flow rate value, ensuring that the system can efficiently absorb the heat of the high-temperature flue gas. Specifically, the heat exchange efficiency of the high-temperature flue gas increases first and then decreases as the target water flow rate increases from small to large.

[0052] Further, in a preferred solution of the embodiment of the present application, after controlling the first valve and the second valve to open and controlling the water pump to start according to the first group of control signals, the control method further includes:

[0053] Step c1, obtaining the flow value of the target flow collected by the flow meter; the target flow is the gas volume of the high-temperature flue gas discharged from the furnace outlet into the first channel within a preset unit time.

[0054] Here, in the context of frequent low-load operation of coal-fired units for peak load regulation, the increase in flue gas temperature will also lead to an increase in flue gas volume, causing the volume flow of the tail equipment to exceed the limit and reduce the heat exchange efficiency. Therefore, the control module 107 of the embodiment of the present application also monitors the flow value of the high-temperature flue gas discharged from the furnace outlet in real time through the flow meter 108, and analyzes the received flow value to determine whether it is necessary to further adjust the system operation parameters.

[0055] Step c2, if the flow value of the target flow is greater than the preset flow threshold, determine the second flow rate value of the target water flow rate according to the flow value of the target flow and the second preset mapping relationship; the second preset mapping relationship is the mapping relationship between the target water flow rate and the target flow, and the second flow rate value is, under the conditions of the flow value of the target flow and the preset time threshold, the target water flow rate required to reduce the flow value of the target flow to the preset flow threshold.

[0056] The refrigerant water flow rate (second flow rate value) required to reduce the high-temperature flue gas flow to a preset threshold is calculated based on a preset second mapping relationship. The mapping relationship is also pre-established based on system design parameters and experimental data to ensure that the system can operate stably under different flow conditions.

[0057] Here, when the control module 107 detects that the flow value of the target flow exceeds the preset flow threshold, it calculates the second flow rate value of the target water flow rate required for reducing the flow value of the target flow to the preset flow threshold under the conditions of the flow value of the target flow and the preset time threshold according to the flow value of the target flow and the preset second preset mapping relationship. Among them, the second preset mapping relationship is a mapping relationship between the target water flow rate and the target flow, which can be pre-established based on the system design parameters and experimental data, and the preset flow threshold is specifically set according to the design parameters of the system, which is not limited here. In this way, it can be ensured that the system can fully utilize the flue gas waste heat while ensuring that the tail equipment can work within the normal flow range, thereby improving the safety performance of the unit operation.

[0058] Step c3: generating a fourth set of control signals according to the second flow rate value.

[0059] Here, the control module 107 generates a fourth set of control signals according to the calculated second flow rate value, so as to adjust the target water flow rate.

[0060] Step c4, controlling the working power of the water pump and the openings of the first valve and the second valve according to the fourth group of control signals, so as to adjust the target water flow rate to the second flow rate value.

[0061] Here, by adjusting the working power of the water pump 105 and the openings of the first valve 103 and the second valve 104, the target water flow rate reaches the second flow rate value, ensuring that the system can efficiently absorb the heat of the high-temperature flue gas.

[0062] Furthermore, in the preferred solution 2 of the embodiment of the present application, the control method further includes:

[0063] Step d1, obtaining a temperature value of a second temperature collected by the second temperature sensor; the second temperature is the temperature of the heating network water supply discharged from the outlet of the fourth channel to the heating network water supply pipeline.

[0064] Here, the second temperature sensor 109 monitors the temperature of the heating network water supply discharged from the fourth channel outlet in real time and transmits the temperature value to the control module 107. The control module 107 analyzes the received temperature value to determine whether the operating state of the heating network water supply mixer 110 needs to be adjusted.

[0065] Step d2: generating a fifth set of control signals according to the temperature value of the second temperature.

[0066] Here, the control module 107 generates a fifth set of control signals according to the temperature value of the second temperature, so as to be used for subsequently adjusting the mixing ratio of the heating network feedwater mixer 110 .

[0067] Step d3, according to the fifth group of control signals, controlling the mixing ratio of the heating network water supply mixer to make the heating network water supply temperature passing through the heating network water supply mixer constant.

[0068] Here, the control module 107 adjusts the mixing ratio of the heating network water supply mixer 110 according to the fifth group of control signals to ensure that the temperature of the heating network water supply is kept within a constant range before entering the user end. This process is achieved by accurately controlling the mixing ratio of cold and hot water. Specifically, if the temperature value of the second temperature increases, the proportion of cold water in the mixing ratio of the heating network water supply mixer 110 is increased; conversely, if the temperature value of the second temperature decreases, the proportion of hot water in the mixing ratio of the heating network water supply mixer 110 is increased to ensure the stability of the heating system of the heating network and the comfort of the user end.

[0069] The embodiment of the present application provides a control method for waste heat recovery of a heating network heating system, which is applied to a control module of a control device for waste heat recovery of the heating network heating system, the control device comprising a first heat exchanger, a second heat exchanger, a first valve, a second valve, a water pump, a first temperature sensor and a control module; the inlet of the first channel of the first heat exchanger is connected to the furnace outlet pipeline of the coal-fired unit of the heating network heating system, the outlet of the first channel is connected to the dust collector pipeline of the heating network heating system, the outlet of the second channel of the first heat exchanger is connected to the inlet pipeline of the third channel of the second heat exchanger through the first valve, and the inlet of the second channel is connected to the outlet pipeline of the third channel through the second valve; the inlet of the fourth channel of the second heat exchanger is connected to the heating network return water pipeline of the heating network heating system, and the outlet of the fourth channel is connected to the heating network water supply pipeline of the heating network heating system; the water pump is located in the pipeline connecting the second channel and the third channel; the first temperature sensor is located in the heating network in the first channel; the first valve, the second valve, the water pump and the first temperature sensor are electrically connected to the control module respectively; the control method includes: obtaining the temperature value of the first temperature collected by the first temperature sensor; the first temperature is the temperature of the high-temperature flue gas discharged from the furnace outlet into the first channel; if the temperature value of the first temperature is greater than or equal to the preset first temperature threshold, a first group of control signals is generated; according to the first group of control signals, the first valve and the second valve are controlled to open, and the water pump is controlled to start at the same time, so that the refrigerant water flowing in from the inlet of the second channel is heated to heat medium water in the second channel by the heat of the high-temperature flue gas absorbed from the first channel, and the heat medium water is discharged from the outlet of the second channel to the third channel, so that the heat network return water flowing in from the inlet of the fourth channel is heated to heat network feed water in the fourth channel by the heat of the heat medium water absorbed from the third channel, and the heat network feed water is discharged from the outlet of the fourth channel to the heat network feed water pipeline. In this way, the waste heat of flue gas is used to provide additional heat energy for the heat network feed water, thereby improving the waste heat recovery efficiency of the heat network heating system.

[0070] Based on the same application concept, the embodiment of the present application also provides a control module corresponding to the control method for waste heat recovery of the heat network heating system provided in the above embodiment. Since the principle of solving the problem by the control module in the embodiment of the present application is similar to the control method for waste heat recovery of the heat network heating system in the above embodiment of the present application, the implementation of the control module can refer to the implementation of the method, and the repeated parts will not be repeated.

[0071] See also Figure 4 , Figure 4 This is one of the functional module diagrams of a control module provided in an embodiment of the present application. Figure 4 As shown, the control module 107 includes:

[0072] The acquisition unit 1071 is used to acquire a temperature value of a first temperature collected by the first temperature sensor; the first temperature is the temperature of the high-temperature flue gas discharged from the furnace outlet into the first channel.

[0073] The first judgment unit 1072 is configured to generate a first set of control signals if the temperature value of the first temperature is greater than or equal to a preset first temperature threshold.

[0074] The first control unit 1073 is used to control the opening of the first valve and the second valve according to the first group of control signals, and control the start of the water pump at the same time, so that the refrigerant water flowing in from the inlet of the second channel is heated into heat medium water in the second channel by the heat of the high-temperature flue gas absorbed from the first channel, and the heat medium water is discharged from the outlet of the second channel to the third channel, and the hot network return water flowing in from the inlet of the fourth channel is heated into hot network feed water in the fourth channel by the heat of the heat medium water absorbed from the third channel, and the hot network feed water is discharged from the outlet of the fourth channel to the hot network water supply pipeline.

[0075] For further information, see Figure 5 , Figure 5 This is a second functional module diagram of a control module provided in an embodiment of the present application. Figure 5 As shown, the control module 107 also includes:

[0076] The second judgment unit 1074 is configured to generate a second set of control signals if the temperature value of the first temperature is less than the first temperature threshold.

[0077] The second control unit 1075 is used to control the first valve and the second valve to close according to the second group of control signals, and control the water pump to close at the same time.

[0078] Furthermore, if Figure 5 As shown, the control module 107 also includes:

[0079] The determining unit 1076 is used to determine a first flow rate value of a target water flow rate according to the temperature value of the first temperature and a first preset mapping relationship; the first preset mapping relationship is a mapping relationship between the target water flow rate and the first temperature, and the target water flow rate is the water flow rate of the refrigerant water flowing into the inlet of the second channel; the first flow rate value is the target water flow rate required to reduce the temperature value of the first temperature to the second temperature threshold under the conditions of the temperature value of the first temperature and a preset time threshold; and a third group of control signals are generated according to the first flow rate value;

[0080] The third control unit 1077 is used to control the working power of the water pump and the openings of the first valve and the second valve according to the third group of control signals, so as to adjust the target water flow rate to the first flow rate value.

[0081] In preferred scheme 1 of the embodiment of the present application, the acquisition unit 1071 is also used to obtain the flow value of the target flow collected by the flow meter; the target flow is the gas volume of the high-temperature flue gas discharged from the furnace outlet into the first channel within a preset unit time.

[0082] The determination unit 1076 is further configured to determine, if the flow value of the target flow is greater than a preset flow threshold, a second flow rate value of the target water flow rate according to the flow value of the target flow and a second preset mapping relationship; the second preset mapping relationship is a mapping relationship between the target water flow rate and the target flow, and the second flow rate value is a target water flow rate required to reduce the flow value of the target flow to the preset flow threshold under the conditions of the flow value of the target flow and the preset time threshold; and generate a fourth group of control signals according to the second flow rate value;

[0083] The third control unit 1077 is further used to control the working power of the water pump and the opening of the first valve and the second valve according to the fourth group of control signals, so as to adjust the target water flow rate to the second flow rate value.

[0084] In preferred scheme 2 of the embodiment of the present application, the acquisition unit 1071 is also used to obtain the temperature value of the second temperature collected by the second temperature sensor; the second temperature is the temperature of the heating network water supply discharged from the outlet of the fourth channel to the heating network water supply pipeline.

[0085] like Figure 5 As shown, the control module 204 further includes:

[0086] The fourth control unit 1078 is used to generate a fifth set of control signals according to the temperature value of the second temperature; and control the mixing ratio of the heating network water supply mixer according to the fifth set of control signals to make the heating network water supply temperature passing through the heating network water supply mixer constant.

[0087] A control module provided in an embodiment of the present application is applied to a control device for waste heat recovery of a heating network heating system, the control device comprising a first heat exchanger, a second heat exchanger, a first valve, a second valve, a water pump, a first temperature sensor and a control module; the inlet of the first channel of the first heat exchanger is connected to the furnace outlet pipeline of the coal-fired unit of the heating network heating system, the outlet of the first channel is connected to the dust collector pipeline of the heating network heating system, the outlet of the second channel of the first heat exchanger is connected to the inlet pipeline of the third channel of the second heat exchanger through the first valve, and the inlet of the second channel is connected to the outlet pipeline of the third channel through the second valve; the inlet of the fourth channel of the second heat exchanger is connected to the heating network return water pipeline of the heating network heating system, and the outlet of the fourth channel is connected to the heating network water supply pipeline of the heating network heating system; the water pump is located in the pipeline connecting the second channel and the third channel; the first temperature sensor is located in the first channel; the first valve, the second valve, the water pump and The first temperature sensors are electrically connected to the control module respectively; the control module includes: an acquisition unit, used to acquire the temperature value of the first temperature collected by the first temperature sensor; the first temperature is the temperature of the high-temperature flue gas discharged from the furnace outlet into the first channel; a first judgment unit, used to generate a first group of control signals if the temperature value of the first temperature is greater than or equal to the preset first temperature threshold; a first control unit, used to control the first valve and the second valve to open according to the first group of control signals, and control the water pump to start at the same time, so that the refrigerant water flowing in from the inlet of the second channel is heated to heat medium water in the second channel by the heat of the high-temperature flue gas absorbed from the first channel, and the heat medium water is discharged from the outlet of the second channel to the third channel, so that the heat network return water flowing in from the inlet of the fourth channel is heated to heat network feed water in the fourth channel by the heat of the heat medium water absorbed from the third channel, and the heat network feed water is discharged from the outlet of the fourth channel to the heat network feed water pipeline. In this way, the flue gas waste heat is used to provide additional heat energy for the heat network feed water, thereby improving the waste heat recovery efficiency of the heat network heating system.

[0088] Based on the same application idea, please refer to Figure 6 , Figure 6 This is a schematic diagram of the structure of an electronic device provided in an embodiment of the present application. Figure 6 As shown, the electronic device 600 includes a processor 610 , a memory 620 and a bus 630 .

[0089] The memory 620 stores machine-readable instructions executable by the processor 610. When the electronic device 600 is running, the processor 610 communicates with the memory 620 through the bus 630. When the processor 610 is running, the machine-readable instructions execute the steps of the control method for waste heat recovery of the heating network heating system provided in the above embodiment. The specific implementation method can be found in the method embodiment, which will not be repeated here.

[0090] Based on the same application concept, an embodiment of the present application also provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps of the control method for waste heat recovery of the thermal network heating system provided in the above embodiment are executed. The specific implementation method can be found in the method embodiment, which will not be repeated here.

[0091] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the above-described devices and units can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0092] In the embodiments provided in the present application, it should be understood that the disclosed methods, modules and devices can be implemented in other ways. The device embodiments described above are merely schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some communication interfaces, and the indirect coupling or communication connection of devices or units can be electrical, mechanical or other forms.

[0093] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0094] In addition, each functional unit in the embodiments provided in the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0095] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in each embodiment of the present application. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0096] It should be noted that similar numbers and letters represent similar items in the following figures. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description and are not to be understood as indicating or implying relative importance.

[0097] Finally, it should be noted that the above-described embodiments are only specific implementation methods of the present application, which are used to illustrate the technical solutions of the present application, rather than to limit them. The protection scope of the present application is not limited thereto. Although the present application is described in detail with reference to the above-mentioned embodiments, ordinary technicians in the field should understand that any technician familiar with the technical field can still modify the technical solutions recorded in the above-mentioned embodiments within the technical scope disclosed in the present application, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application. They should all be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A control method for waste heat recovery of a heating network heating system, characterized in that: A control module for a control device for waste heat recovery of a heating network heating system, the control device comprising a first heat exchanger, a second heat exchanger, a first valve, a second valve, a water pump, a first temperature sensor and a control module; the inlet of a first channel of the first heat exchanger is connected to a furnace outlet pipeline of a coal-fired unit of the heating network heating system, the outlet of the first channel is connected to a dust collector pipeline of the heating network heating system, the outlet of the second channel of the first heat exchanger is connected to an inlet pipeline of a third channel of the second heat exchanger through the first valve, and the inlet of the second channel is connected to an outlet pipeline of the third channel through the second valve; the inlet of a fourth channel of the second heat exchanger is connected to a heating network return water pipeline of the heating network heating system, and the outlet of the fourth channel is connected to a heating network water supply pipeline of the heating network heating system; the water pump is located in a pipeline connecting the second channel and the third channel; The first temperature sensor is located in the first channel; The first valve, the second valve, the water pump and the first temperature sensor are electrically connected to the control module respectively; the control method comprises: Acquire a temperature value of a first temperature collected by the first temperature sensor; the first temperature is the temperature of high-temperature flue gas discharged from the furnace outlet into the first channel; If the temperature value of the first temperature is greater than or equal to a preset first temperature threshold, generating a first set of control signals; According to the first group of control signals, the first valve and the second valve are controlled to open, and the water pump is controlled to start at the same time, so that the refrigerant water flowing in from the inlet of the second channel is heated into heat medium water in the second channel by the heat of the high-temperature flue gas absorbed from the first channel, and the heat medium water is discharged from the outlet of the second channel to the third channel, and the hot network return water flowing in from the inlet of the fourth channel is heated into hot network feed water in the fourth channel by the heat of the heat medium water absorbed from the third channel, and the hot network feed water is discharged from the outlet of the fourth channel to the hot network feed water pipeline.

2. The control method for waste heat recovery of a heating network heating system according to claim 1, characterized in that: The control method further comprises: If the temperature value of the first temperature is less than the first temperature threshold, generating a second set of control signals; According to the second group of control signals, the first valve and the second valve are controlled to be closed, and the water pump is controlled to be closed at the same time.

3. The control method for waste heat recovery of a heating network heating system according to claim 1, characterized in that: If the temperature value of the first temperature is greater than a preset second temperature threshold, after the first valve and the second valve are controlled to open and the water pump is controlled to start according to the first group of control signals, the control method further includes: Determine a first flow rate value of a target water flow rate according to the temperature value of the first temperature and a first preset mapping relationship; the first preset mapping relationship is a mapping relationship between the target water flow rate and the first temperature, and the target water flow rate is the flow rate of the refrigerant water flowing into the inlet of the second channel; the first flow rate value is the target water flow rate required to reduce the temperature value of the first temperature to the second temperature threshold under the conditions of the temperature value of the first temperature and a preset time threshold; generating a third set of control signals according to the first flow rate value; According to the third group of control signals, the working power of the water pump and the openings of the first valve and the second valve are controlled to adjust the target water flow rate to the first flow rate value.

4. The control method for waste heat recovery of a heating network heating system according to claim 3 is characterized in that: The control device further includes a flow meter; the flow meter is located in the first channel, and the flow meter is electrically connected to the control module; after the first valve and the second valve are controlled to open and the water pump is controlled to start according to the first group of control signals, the control method further includes: Obtaining a flow value of a target flow collected by the flow meter; the target flow is the gas volume of high-temperature flue gas discharged from the furnace outlet into the first channel within a preset unit time; If the flow value of the target flow is greater than the preset flow threshold, a second flow rate value of the target water flow rate is determined according to the flow value of the target flow and a second preset mapping relationship; the second preset mapping relationship is a mapping relationship between the target water flow rate and the target flow, and the second flow rate value is the target water flow rate required to reduce the flow value of the target flow to the preset flow threshold under the conditions of the flow value of the target flow and the preset time threshold; generating a fourth set of control signals according to the second flow rate value; According to the fourth group of control signals, the working power of the water pump and the openings of the first valve and the second valve are controlled to adjust the target water flow rate to the second flow rate value.

5. The control method for waste heat recovery of a heating network heating system according to claim 1, characterized in that: The control device further comprises a second temperature sensor and a heating network water supply mixer; the second temperature sensor is located in the fourth channel; the heating network water supply mixer is installed on the heating network water supply pipeline; The second temperature sensor and the heating network water supply mixer are electrically connected to the control module respectively; the control method also includes: Acquire a temperature value of a second temperature collected by the second temperature sensor; the second temperature is the temperature of the heating network water supply discharged from the outlet of the fourth channel to the heating network water supply pipeline; generating a fifth set of control signals according to the temperature value of the second temperature; According to the fifth group of control signals, the mixing ratio of the heating network water supply mixer is controlled to make the temperature of the heating network water supply passing through the heating network water supply mixer constant.

6. A control module, characterized in that: A control device for waste heat recovery of a heating network heating system, the control device comprising a first heat exchanger, a second heat exchanger, a first valve, a second valve, a water pump, a first temperature sensor and a control module; the inlet of the first channel of the first heat exchanger is connected to the furnace outlet pipeline of the coal-fired unit of the heating network heating system, the outlet of the first channel is connected to the dust collector pipeline of the heating network heating system, the outlet of the second channel of the first heat exchanger is connected to the inlet pipeline of the third channel of the second heat exchanger through the first valve, and the inlet of the second channel is connected to the outlet pipeline of the third channel through the second valve; the inlet of the fourth channel of the second heat exchanger is connected to the heating network return pipeline of the heating network heating system, and the outlet of the fourth channel is connected to the heating network water supply pipeline of the heating network heating system; the water pump is located in the pipeline connecting the second channel and the third channel; the first temperature sensor is located in the first channel; The first valve, the second valve, the water pump and the first temperature sensor are electrically connected to the control module respectively; the control module comprises: An acquisition unit, configured to acquire a temperature value of a first temperature collected by the first temperature sensor; the first temperature is the temperature of high-temperature flue gas discharged from the furnace outlet into the first channel; A first judgment unit, configured to generate a first set of control signals if the temperature value of the first temperature is greater than or equal to a preset first temperature threshold; The first control unit is used to control the opening of the first valve and the second valve according to the first group of control signals, and control the start of the water pump at the same time, so that the refrigerant water flowing into the inlet of the second channel is heated into heat medium water in the second channel by the heat of the high-temperature flue gas absorbed from the first channel, and the heat medium water is discharged from the outlet of the second channel to the third channel, and the heat network return water flowing into the inlet of the fourth channel is heated into heat network feed water in the fourth channel by the heat of the heat medium water absorbed from the third channel, and the heat network feed water is discharged from the outlet of the fourth channel to the heat network feed water pipeline.

7. The control module according to claim 6, characterized in that: The control module also includes: a second judgment unit, configured to generate a second set of control signals if the temperature value of the first temperature is less than the first temperature threshold; The second control unit is used to control the first valve and the second valve to close according to the second group of control signals, and control the water pump to close at the same time.

8. A control device for waste heat recovery of a heating network heating system, characterized in that: The control device includes a first heat exchanger, a second heat exchanger, a first valve, a second valve, a water pump, a first temperature sensor and a control module as described in any one of claims 6-7; the inlet of the first channel of the first heat exchanger is connected to the furnace outlet pipeline of the coal-fired unit of the heating network heating system, the outlet of the first channel is connected to the dust collector pipeline of the heating network heating system, the outlet of the second channel of the first heat exchanger is connected to the inlet pipeline of the third channel of the second heat exchanger through the first valve, and the inlet of the second channel is connected to the outlet pipeline of the third channel through the second valve; the inlet of the fourth channel of the second heat exchanger is connected to the heating network return pipeline of the heating network heating system, and the outlet of the fourth channel is connected to the heating network water supply pipeline of the heating network heating system; the water pump is located in the pipeline connecting the second channel and the third channel; the first temperature sensor is located in the first channel; the first valve, the second valve, the water pump and the first temperature sensor are electrically connected to the control module respectively.

9. An electronic device, characterized in that: include: A processor, a memory and a bus, wherein the memory stores machine-readable instructions executable by the processor, and when the electronic device is running, the processor and the memory communicate through the bus, and the machine-readable instructions are executed by the processor to execute the steps of the control method for waste heat recovery of a heating network heating system as described in any one of claims 1 to 5.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the control method for waste heat recovery of a heating network heating system according to any one of claims 1 to 5 are executed.

Images