Combined heat and power generation heat storage type stable steam supply system and control method thereof

Abstract

The present application discloses a heat storage type stable steam supply system for combined heat and power generation and a control method thereof. The system includes: a normal gas source inlet, a high-temperature gas source inlet, a low-temperature gas source inlet, an adiabatic stratified heat storage device, a heat storage process steam mixer, a heat storage steam flow regulating valve, a heat storage process steam supply temperature regulating valve, a high-temperature gas source heat release switch valve, a heat release process steam mixer, a heat release steam flow regulating valve, a heat release process steam supply temperature regulating valve, a low-temperature gas source heat absorption switch valve, a system steam supply pressure stabilizing mixer and a steam supply pressure stabilizing regulating valve. The adiabatic stratified heat storage device includes: a device heat storage process steam inlet, a device heat storage process steam outlet, a device heat release process steam inlet and a device heat release process steam outlet. Through this system, it can be ensured that the combined heat and power unit can perform heat storage or heat release operation during the peak load period of the power grid, and can also stably perform heat production, thereby improving the stability and reliability of external heat supply.

Description

Technical Field

[0001] The present application relates to the technical field of heat storage and steam supply, and in particular to a heat and power cogeneration heat storage type stable steam supply system and a control method thereof. Background Art

[0002] In the context of increasingly tight energy, cogeneration is one of the technologies currently used by thermal power plants to save energy, reduce consumption and improve energy utilization. Cogeneration (CHP) refers to the use of generator sets to generate electricity and useful heat at the same time. When the relevant generator sets are in operation, they can not only provide electricity but also output heat energy.

[0003] In recent years, with the development of new energy technologies, the demand for new energy consumption in various regions has been growing. The power generation operation mechanism has forced thermal power plants to deeply participate in the peak load regulation of the power grid, and the generator sets have continuously dropped to the lowest limit operating load, which has had a serious impact on the heat production of thermal power plants.

[0004] In the related technology, when thermal power generating units participate in the peak load regulation of the power grid, cogeneration can only choose to give priority to heat supply or give priority to meeting the peak load regulation demand of the power grid. However, this method will affect the power supply and cause resource loss when giving priority to heat supply, and will reduce the quality of external heat production when giving priority to meeting the peak load regulation demand of the power grid. Therefore, how to ensure that the cogeneration unit can cooperate with the peak load regulation and stably produce heat during the "peak and valley period" of the power grid has become a problem that needs to be solved urgently. Summary of the invention

[0005] The purpose of this application is to solve one of the above-mentioned technical problems at least to a certain extent.

[0006] To this end, the first purpose of this application is to propose a cogeneration heat storage type stable steam supply system. The system is based on an adiabatic stratified heat storage device. By introducing three steam sources of normal, high temperature and low temperature, setting temperature and pressure regulating valves and steam mixers, and optimizing the configuration of the process pipeline system, it ensures that the cogeneration unit can store or release heat during the peak load period of the power grid, and can also stably produce heat, thereby improving the stability and reliability of external heat supply. In addition, it is easy to combine with effective control strategies, simplify the operation difficulty of the system, and eliminate the influence of various possible interference factors on the system function. The system is reasonably designed and simple in operation and control, which greatly enriches the application scenarios of heat storage steam supply technology.

[0007] The second objective of the present application is to provide a control method for a heat and power cogeneration thermal storage type stable steam supply system.

[0008] A third object of the present application is to provide a non-transitory computer-readable storage medium.

[0009] To achieve the above-mentioned purpose, the first embodiment of the present application proposes a heat and power cogeneration heat storage type stable steam supply system, which includes: a normal gas source inlet, a high-temperature gas source inlet, a low-temperature gas source inlet, an adiabatic stratified heat storage device, a heat storage process steam mixer, a heat storage steam flow regulating valve, a heat storage process steam supply temperature regulating valve, a high-temperature gas source heat release switch valve, a heat release process steam mixer, a heat release steam flow regulating valve, a heat release process steam supply temperature regulating valve, a low-temperature gas source heat absorption switch valve, a system steam supply pressure stabilizing mixer and a steam supply pressure stabilizing regulating valve, the adiabatic stratified heat storage device includes: a device heat storage process steam inlet, a device heat storage process steam outlet, a device heat release process steam inlet and a device heat release process steam outlet, wherein,

[0010] The high-temperature gas source inlet is connected to the heat storage process steam inlet of the device, and the high-temperature gas source inlet is also connected to the first end of the heat storage process steam supply temperature regulating valve through a heat storage process steam bypass pipeline;

[0011] The heat storage process steam outlet of the device is connected to the first end of the heat storage steam flow regulating valve, the second end of the heat storage steam flow regulating valve is connected to the first end of the heat storage process steam mixer, the second end of the heat storage process steam supply temperature regulating valve is connected to the second end of the heat storage process steam mixer, and the third end of the heat storage process steam mixer is connected to the first end of the high-temperature gas source heat release switch valve;

[0012] The low-temperature gas source inlet is connected to the heat release process steam inlet of the device, and the low-temperature gas source inlet is also connected to the first end of the heat release process steam supply temperature regulating valve through a heat release process steam bypass pipeline;

[0013] The heat release process steam outlet of the device is connected to the first end of the heat release steam flow regulating valve, the second end of the heat release steam flow regulating valve is connected to the first end of the heat release process steam mixer, the second end of the heat release process steam supply temperature regulating valve is connected to the second end of the heat release process steam mixer, and the third end of the heat release process steam mixer is connected to the first end of the low-temperature gas source heat absorption switch valve;

[0014] The second end of the high-temperature gas source exothermic switch valve and the second end of the low-temperature gas source endothermic switch valve are connected to the first end of the system steam supply and pressure stabilizing mixer, the normal gas source inlet is connected to the first end of the steam supply and pressure stabilizing regulating valve, the second end of the steam supply and pressure stabilizing regulating valve is connected to the second end of the system steam supply and pressure stabilizing mixer, and the third end of the system steam supply and pressure stabilizing mixer is connected to the system external steam supply main pipe.

[0015] In addition, the heat and power cogeneration thermal storage type stable steam supply system of the embodiment of the present application also has the following additional technical features:

[0016] Optionally, in some embodiments, a device heat storage process steam outlet temperature measuring point is provided between the device heat storage process steam outlet and the first end of the heat storage steam flow regulating valve; a device heat storage process steam supply temperature and pressure measuring point is provided between the third end of the heat storage process steam mixer and the first end of the high-temperature gas source heat release switch valve; a device heat release process steam outlet temperature measuring point is provided between the device heat release process steam outlet and the first end of the heat release steam flow regulating valve; a device heat release process steam supply temperature and pressure measuring point is provided between the third end of the heat release process steam mixer and the first end of the low-temperature gas source heat absorption switch valve; and a system external steam supply temperature and pressure measuring point is provided on the external steam supply main pipe.

[0017] Optionally, in some embodiments, the normal gas source inlet, the high-temperature gas source inlet and the low-temperature gas source inlet are used to correspondingly transmit the normal gas source, high-temperature gas source and low-temperature gas source introduced from the thermal system of the cogeneration unit into the cogeneration heat storage type stable steam supply system; wherein the parameters of the normal gas source are the target parameters of the cogeneration heat storage type stable steam supply system for external gas supply, the parameters of the high-temperature gas source are higher than the target parameters, and the parameters of the low-temperature gas source are lower than the target parameters.

[0018] To achieve the above object, a second embodiment of the present invention provides a control method for a combined heat and power thermal storage type stable steam supply system, wherein the combined heat and power thermal storage type stable steam supply system is the combined heat and power thermal storage type stable steam supply system of the first aspect, and the method comprises:

[0019] Determine the current operating status of the cogeneration unit;

[0020] When the cogeneration unit is in normal operation, the high-temperature gas source heat release switch valve and the low-temperature gas source heat absorption switch valve are closed, and the normal gas source introduced is regulated through the steam supply pressure regulating valve;

[0021] When the cogeneration unit is in a peak load state, the gas supply operation mode of the cogeneration heat storage type stable steam supply system is determined with the goal of stabilizing the external gas supply parameters of the system;

[0022] The heat and power cogeneration thermal storage type stable steam supply system is controlled to execute a heat storage steam supply operation mode or a heat release steam supply operation mode according to the determination result.

[0023] In addition, the control method of the heat and power cogeneration thermal storage type stable steam supply system of the embodiment of the present application also has the following additional technical features:

[0024] Optionally, in some embodiments, the cogeneration heat storage type stable steam supply system is controlled to execute the heat storage steam supply operation mode, including: opening the high-temperature gas source heat release switch valve and closing the low-temperature gas source heat absorption switch valve; controlling a portion of high-temperature steam to enter the adiabatic stratified heat storage device to release heat and cool down, and then passing through the heat storage steam flow regulating valve and mixing with another portion of high-temperature steam that directly passes through the heat storage process steam supply temperature regulating valve in the heat storage process steam mixer; based on the PID closed-loop control method, the outlet pressure of the heat storage process steam mixer is automatically adjusted by the heat storage steam flow regulating valve, and the outlet temperature of the heat storage process steam mixer is automatically adjusted by the heat storage process steam supply temperature regulating valve.

[0025] Optionally, in some embodiments, the cogeneration heat storage type stable steam supply system is controlled to execute the heat release steam supply operation mode, including: opening the low-temperature gas source heat absorption switch valve and closing the high-temperature gas source heat release switch valve; controlling a portion of low-temperature steam to enter the adiabatic stratified heat storage device to absorb heat and heat up, and then passing through the heat release steam flow regulating valve and mixing with another portion of low-temperature steam that directly passes through the heat release process steam supply temperature regulating valve in the heat release process steam mixer; based on the PID closed-loop control method, the outlet pressure of the heat release process steam mixer is automatically adjusted by the heat release steam flow regulating valve, and the outlet temperature of the heat release process steam mixer is automatically adjusted by the heat release process steam supply temperature regulating valve.

[0026] Optionally, in some embodiments, the method further includes: when the steam supply temperature regulating valve in the heat storage process is closed to the minimum valve position, or when the real-time monitored temperature at the device outlet is greater than the target steam supply temperature, closing the high-temperature gas source heat release switch valve to stop the heat storage steam supply operation mode, and automatically switching to normal gas source steam supply.

[0027] Optionally, in some embodiments, the method further includes: during the heat release process, when the steam supply temperature regulating valve is opened to the maximum valve position, or when the real-time monitored temperature at the device outlet is lower than the target steam supply temperature, closing the low-temperature gas source heat absorption switch valve to stop the heat release steam supply operation mode, and automatically switching to normal gas source steam supply.

[0028] Optionally, in some embodiments, the method further includes: during the execution of the heat storage steam supply operation mode or the heat release steam supply operation mode, if the output high-temperature steam flow rate or low-temperature steam flow rate cannot meet the external steam supply pressure requirement, a normal gas source is introduced, and the normal gas source is controlled to pass through the steam supply pressure stabilizing regulating valve and mix with the steam after heat release or heat absorption in the system steam supply pressure stabilizing mixer to maintain the steam supply pressure stable.

[0029] To achieve the above-mentioned objectives, the third aspect of the present invention proposes a non-temporary computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, it implements a control method for a cogeneration thermal storage type stable steam supply system as described in any one of the second aspect embodiments above.

[0030] The technical solution provided by the embodiments of the present application brings at least the following beneficial effects:

[0031] This application introduces three steam sources with different parameter levels, reasonably sets up an adiabatic stratified heat storage device and a steam mixer, and uses an optimized control method for the regulating valve to enable the system to simultaneously have the functions of steam heat storage / heat release and constant temperature and pressure stable steam supply, ultimately enabling the cogeneration unit to achieve heat storage and peak-shaving operation without affecting the quality of steam supply. In the heat storage and heat release stages, the functions of steam heat storage and stable steam supply are achieved by simply adjusting the steam flow rates of three different parameter levels drawn from the thermal system of the original unit, with little impact on the thermal system of the original unit. When the system operating conditions change, the thermal system of the original unit can be adjusted autonomously to re-establish thermal balance without human intervention, greatly reducing the complexity of system operation. The control logic is clear and simple, the hardware cost is low, and it is easy to implement in practical applications. Moreover, all operation control functions in the present application are completed by the regulating valve, which has continuous adjustability, especially when the system switches between normal steam supply, heat storage steam supply, heat release steam supply and other working conditions, there will be no sudden changes in the operating parameters, which ensures the feasibility of the system's undisturbed switching and minimizes the impact of the system's changing working conditions on the original system. Since the system has the function of undisturbed switching of operating conditions, the system can be turned on or off at any time in any operating mode, and can still maintain stable operation of external steam supply during the switching process, greatly enhancing the flexibility of system operation. The function of the system's external stable parameter steam supply is the result of the joint action of multiple regulating valves. When each regulating valve is modified and adjusted to follow the set value, the system's external steam supply parameters can be changed, the flexibility of the system operation is improved, and the stability and reliability of external heat supply are guaranteed.

[0032] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0034] Figure 1 A schematic diagram of the structure of a heat and power cogeneration thermal storage type stable steam supply system proposed in an embodiment of the present application;

[0035] Figure 2A flow chart of a control method for a heat and power cogeneration thermal storage type stable steam supply system proposed in an embodiment of the present application;

[0036] Figure 3 A flow chart of a heat storage steam supply operation control method proposed in an embodiment of the present application;

[0037] Figure 4 This is a flow chart of a heat release and steam supply operation control method proposed in an embodiment of the present application. DETAILED DESCRIPTION

[0038] Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0039] It should be noted that in the embodiments of the present application, thermal energy can be stored and released based on heat storage technology to improve the operational flexibility of the cogeneration unit and meet the needs of participating in grid peak regulation and heat production. However, the coupling application of heat storage technology and cogeneration units is not mature. Therefore, how to establish a system with heat storage function and stable operation is a key issue that needs to be addressed at present. Among them, the key technologies for establishing the system are to achieve rapid start and stop of thermal energy storage and release functions and ensure stable and reliable steam supply to the outside. To this end, the present application proposes a cogeneration heat storage type stable steam supply system and a control method thereof.

[0040] The following describes a heat and power cogeneration thermal storage type stable steam supply system and a control method thereof according to an embodiment of the present application with reference to the accompanying drawings.

[0041] Figure 1 This is a structural schematic diagram of a heat and power cogeneration heat storage type stable steam supply system proposed in an embodiment of the present application, such as Figure 1 As shown, the system comprises: a normal gas source inlet (1), a high-temperature gas source inlet (2), a low-temperature gas source inlet (3), an adiabatic stratified heat storage device (5), a heat storage process steam mixer (10), a heat storage steam flow regulating valve CV11 (11), a heat storage process steam supply temperature regulating valve CV12 (12), a high-temperature gas source heat release switch valve V1 (14), a heat release process steam mixer (15), a heat release steam flow regulating valve CV21 (16), a heat release process steam supply temperature regulating valve CV22 (17), a low-temperature gas source heat absorption switch valve V2 (19), a system steam supply pressure stabilizing mixer (20) and a steam supply pressure stabilizing regulating valve CV0 (21), and the adiabatic stratified heat storage device (5) comprises: a device heat storage process steam inlet (6), a device heat storage process steam outlet (7), a device heat release process steam inlet (8) and a device heat release process steam outlet (9).

[0042] The connection method of the above components is as follows: Figure 1 As shown, the high-temperature gas source inlet (2) is connected to the device heat storage process steam inlet (6), and the high-temperature gas source inlet (2) is also connected to the first end of the heat storage process steam supply temperature regulating valve CV12 (12) through the heat storage process steam bypass pipeline (13).

[0043] The heat storage process steam outlet (7) of the device is connected to the first end of the heat storage steam flow regulating valve CV11 (11), the second end of the heat storage steam flow regulating valve CV11 (11) is connected to the first end of the heat storage process steam mixer (15), the second end of the heat storage process steam supply temperature regulating valve CV12 (12) is connected to the second end of the heat storage process steam mixer (15), and the third end of the heat storage process steam mixer (15) is connected to the first end of the high-temperature gas source heat release switch valve V1 (14).

[0044] The low-temperature gas source inlet (3) is connected to the device heat release process steam inlet (8), and the low-temperature gas source inlet (3) is also connected to the first end of the heat release process steam supply temperature regulating valve CV22 (17) through the heat release process steam bypass pipeline (18).

[0045] The heat release process steam outlet (9) of the device is connected to the first end of the heat release steam flow regulating valve CV21 (16), the second end of the heat release steam flow regulating valve CV21 (16) is connected to the first end of the heat release process steam mixer (15), the second end of the heat release process steam supply temperature regulating valve CV22 (17) is connected to the second end of the heat release process steam mixer (15), and the third end of the heat release process steam mixer (15) is connected to the first end of the low-temperature gas source heat absorption switch valve V2 (19).

[0046] The second end of the high-temperature gas source heat release switch valve V1 (14) and the second end of the low-temperature gas source heat absorption switch valve V2 (19) are connected to the first end of the system steam supply pressure stabilizing mixer (20), the normal gas source inlet (1) is connected to the first end of the steam supply pressure stabilizing regulating valve CV0 (21), the second end of the steam supply pressure stabilizing regulating valve CV0 (21) is connected to the second end of the system steam supply pressure stabilizing mixer (20), and the third end of the system steam supply pressure stabilizing mixer (20) is connected to the system external steam supply main pipe (4).

[0047] It should be noted that the first end, the second end or the third end of the above-mentioned component represents different connection ends of the component, and the specific ports are as follows: Figure 1As shown. Among them, the adiabatic stratified heat storage device (5) absorbs and releases heat through multiple adiabatic heat storage layers to store heat, and the steam mixer can mix steam with multiple different parameters. The specific structure and working principle of the adiabatic stratified heat storage device and the steam mixer can refer to the relevant technology and will not be repeated here. The present application aims to control the operation of the system through multiple flow or temperature regulating valves. According to the pressure and temperature of the steam at the relevant position in the system detected, the multiple regulating valves are combined to adjust, so as to realize the external stable parameter steam supply.

[0048] In order to detect the parameters of steam in the system and facilitate subsequent control, in one embodiment of the present application, Figure 1 As shown, in the system, there is a device heat storage process steam outlet temperature measuring point (22) between the device heat storage process steam outlet (7) and the first end of the heat storage steam flow regulating valve; there is a device heat storage process steam supply temperature and pressure measuring point (23) between the third end of the heat storage process steam mixer (10) and the first end of the high-temperature gas source heat release switch valve V1 (14); there is a device heat release process steam outlet temperature measuring point (24) between the device heat release process steam outlet (9) and the first end of the heat release steam flow regulating valve CV21 (16); there is a device heat release process steam supply temperature and pressure measuring point (25) between the third end of the heat release process steam mixer (15) and the first end of the low-temperature gas source heat absorption switch valve V2 (19); and there is a system external steam supply temperature and pressure measuring point (26) on the external steam supply main pipe (4). The characters t0, t1 and p0 on each measuring point in the figure represent the parameters of the steam detected at the measuring point.

[0049] In specific implementation, corresponding detection equipment, such as temperature sensors or gas pressure sensors, may be provided at each of the above-mentioned real-time monitoring points to achieve real-time detection of the passing steam, so as to facilitate the subsequent completion of the system control function.

[0050] In one embodiment of the present application, the heat storage type stable steam supply system for cogeneration is provided with steam gas sources of three parameter levels introduced by the cogeneration unit, and the normal gas source inlet (1), the high temperature gas source inlet (2) and the low temperature gas source inlet (3) are used to respectively introduce the normal steam t M , high temperature steam H and low temperature steam L The corresponding steam is transmitted to the combined heat and power thermal storage type stable steam supply system. Among them, the parameters of normal steam are the target parameters of the combined heat and power thermal storage type stable steam supply system that are expected to output and meet the requirements of external gas supply. The parameters of high-temperature steam are higher than the target parameters, and the parameters of low-temperature steam are lower than the target parameters. The target parameters include the temperature and pressure of the steam provided to the outside. When the system is running, the steam that meets the requirements is led out through the system external steam supply main pipe (4), realizing the basic function of energy storage steam supply of the system as a whole.

[0051] Therefore, the present application combines bypass pipes and main pipes to connect the above-mentioned components, various types of gas source inlets and steam inlets and outlets of the device to form a system including different steam processes, which is convenient for subsequent combination with corresponding control methods to achieve heat storage peak-shaving operation.

[0052] In summary, the heat storage type stable steam supply system for combined heat and power implemented in this application is based on an adiabatic stratified heat storage device. By introducing three steam sources of normal, high temperature and low temperature, setting temperature and pressure regulating valves and steam mixers, and optimizing the configuration of the process pipeline system, it ensures that the combined heat and power unit can store or release heat during the peak load period of the power grid, and can also stably produce heat, thereby improving the stability and reliability of external heat supply. In addition, it is easy to combine with effective control strategies, simplify the operation difficulty of the system, and eliminate the influence of various possible interference factors on the system function. The system is reasonably designed, simple in operation and control, and greatly enriches the application scenarios of heat storage steam supply technology.

[0053] In order to more clearly explain the specific implementation process of adjusting the steam provided to the outside by the above-mentioned cogeneration heat storage type stable steam supply system during heat storage peak regulation operation, a control method for a cogeneration heat storage type stable steam supply system proposed in an embodiment of the present application is described in detail below. The method is applied to the cogeneration heat storage type stable steam supply system in the above-mentioned embodiment, that is, the cogeneration heat storage type stable steam supply system targeted by the control method of the cogeneration heat storage type stable steam supply system is the system described in the above-mentioned implementation, and the components included in the system and the connection method of each component are as described in the above-mentioned embodiment, which will not be repeated here.

[0054] Figure 2 This is a flow chart of a control method for a heat and power cogeneration thermal storage type stable steam supply system proposed in an embodiment of the present application, such as Figure 2 As shown, the method comprises the following steps:

[0055] Step S201: determine the current operating status of the cogeneration unit.

[0056] Specifically, judging the operating status of the unit means judging whether the cogeneration unit is currently participating in the peak load regulation of the power grid or is in a normal operating state.

[0057] In one embodiment of the present application, the current operating status of the cogeneration unit can be determined by detecting whether the cogeneration unit has received a peak-shaving instruction, detecting the power parameters output by the cogeneration unit, or detecting the operating parameters of the unit.

[0058] Step S202: When the cogeneration unit is in normal operation, close the high-temperature gas source heat release switch valve and the low-temperature gas source heat absorption switch valve, and adjust the introduced normal gas source through the steam supply pressure regulating valve.

[0059] Specifically, the control method of the present application performs different controls on the cogeneration heat storage type stable steam supply system according to the current operating state of the cogeneration unit, controls the operation of the system through multiple flow or temperature regulating valves, and realizes external stable parameter steam supply by the joint regulation of multiple regulating valves.

[0060] Among them, when the cogeneration unit is in normal operation, the normal gas source introduced from the thermal system of the cogeneration unit is used to supply steam to the outside. In specific implementation, as a possible implementation method, when the system is in normal operation, the high-temperature gas source heat release switch valve V1 (14) and the low-temperature gas source heat absorption switch valve V2 (19) are controlled to be in a closed state, and the normal gas source is introduced into the system through the normal gas source inlet (1). At this time, the steam supply pressure regulating valve CV0 (21) is put into automatic operation, and operates in a proportional-integral-differential control (Proportion Integration Differentiation, referred to as PID) closed-loop control mode, and the adjustment value is the steam supply pressure output by the cogeneration heat storage type stable steam supply system.

[0061] Step S203: when the cogeneration unit is in the peak load state, the gas supply operation mode of the cogeneration thermal storage type stable steam supply system is determined with the goal of stabilizing the external gas supply parameters of the system.

[0062] Specifically, when the cogeneration unit is in peak-shaving operation, the gas supply operation mode of the cogeneration heat storage type stable steam supply system is determined based on the steam parameters of the unit's current coefficient output after peak-shaving and the target parameters of the required external gas supply, with the goal of stabilizing the system's external gas supply parameters. In the embodiment of the present application, the gas supply operation mode of the cogeneration heat storage type stable steam supply system includes a heat storage steam supply operation mode and a heat release steam supply operation mode, which can be specifically determined according to the heat storage demand of the current system.

[0063] Step S204: controlling the heat storage type stable steam supply system of the cogeneration system to execute the heat storage steam supply operation mode or the heat release steam supply operation mode according to the determination result.

[0064] Specifically, after determining the steam supply operation mode that the heat storage type stable steam supply system of the cogeneration heat and power needs to execute according to the judgment result, the heat storage type stable steam supply system of the cogeneration heat and power is controlled to operate in the corresponding mode. When the system is operating for heat storage steam supply or heat release steam supply, its external steam supply parameters are automatically adjusted and controlled through the steam flow control valve and temperature control valve of the heat storage or heat release.

[0065] In one embodiment of the present application, when the system executes the heat storage steam supply operation mode, the high-temperature steam source of the unit is introduced, and after releasing heat in the heat storage device, the temperature and pressure are adjusted to meet the external steam supply parameter requirements, thereby achieving stable steam supply operation. When the system executes the heat release steam supply operation mode, the system introduces the low-temperature steam source of the unit, and after absorbing heat in the heat storage device, the temperature and pressure are adjusted to meet the external steam supply parameter requirements, thereby achieving stable steam supply operation.

[0066] In order to more clearly illustrate the specific implementation process of controlling the heat storage type stable steam supply system of the cogeneration power generation to perform heat storage steam supply operation and heat release steam supply operation in the present application, the two heat storage steam supply operation control methods and heat release steam supply operation control methods of the unit proposed in the embodiments of the present application are exemplified below.

[0067] Figure 3 This is a flow chart of a heat storage steam supply operation control method proposed in an embodiment of the present application, such as Figure 3 As shown, the method comprises the following steps:

[0068] Step S301: Open the high-temperature gas source heat release switch valve and close the low-temperature gas source heat absorption switch valve.

[0069] Specifically, when the system is operated in the heat storage steam supply mode, the high-temperature gas source heat release switch valve V1 (14) is controlled to open, and the low-temperature gas source heat absorption switch valve V2 (19) is controlled to close, so as to transfer the high-temperature steam t H Introduced into the system by the cogeneration unit.

[0070] Step S302: Control a portion of high-temperature steam to enter the adiabatic stratified heat storage device to release heat and cool down, and then pass through the heat storage steam flow control valve and mix with another portion of high-temperature steam that directly passes through the heat storage process steam supply temperature control valve in the heat storage process steam mixer.

[0071] Specifically, after a portion of the introduced high-temperature steam enters the adiabatic stratified heat storage device (5) to release heat and cool down (the heat storage medium of the device absorbs heat) to complete the heat storage function of the system, it passes through the heat storage steam flow control valve CV11 (11) and another portion of the high-temperature steam that directly passes through the heat storage process steam supply temperature control valve CV12 (12) is mixed in the heat storage process steam mixer (10) to stabilize the pressure and temperature of the external gas supply.

[0072] Step S303: Based on the PID closed-loop control method, the outlet pressure of the heat storage process steam mixer is automatically adjusted by the heat storage process steam flow regulating valve, and the outlet temperature of the heat storage process steam mixer is automatically adjusted by the heat storage process steam supply temperature regulating valve.

[0073] Specifically, when the system is operating in the heat storage steam supply mode, the heat storage steam flow control valve CV11 (11) automatically adjusts the stable steam supply pressure, and the heat storage process steam supply temperature control valve CV12 (12) automatically adjusts the stable steam supply temperature, thereby realizing the stable steam supply function in the heat storage process of the system. That is, the steam after heat release by the adiabatic stratified heat storage device (5) passes through the heat storage steam flow control valve CV11 (11) to stabilize the steam supply pressure, and then enters the heat storage process steam mixer. Furthermore, this part of the heat release and pressure-stabilized high-temperature steam is mixed in the mixer with the high-temperature steam that directly flows through the heat storage process steam supply temperature control valve CV12 (12), and after stabilizing the external steam supply temperature, it passes through the high-temperature gas source heat release switch valve V1 (14) and enters the system steam supply pressure-stabilizing mixer (20).

[0074] In specific implementation, when the system is in the heat storage steam supply operation mode, the high-temperature gas source heat release switch valve is in the open state, and high-temperature steam is introduced into the system. At this time, the heat storage steam flow control valve is put into automatic operation, and operates in a PID closed-loop control mode, and the adjustment value is the outlet pressure of the device heat storage process mixer. Further, the high-temperature steam releases heat and cools down through the adiabatic stratified heat storage device. If the outlet temperature of the device heat storage process steam is less than or equal to the steam supply temperature setting value, the high-temperature gas source bypass (13) introduces part of the high-temperature steam into the heat storage process steam mixer. At this time, the heat storage steam temperature control valve is put into automatic operation, and operates in a PID closed-loop control mode, and the adjustment value is the outlet temperature of the device heat storage process mixer.

[0075] In one embodiment of the present application, when the heat storage and heating operation is in progress, if the steam supply pressure is insufficient, a normal gas source is introduced into the control system. After the normal gas source passes through the steam supply pressure regulating valve CV0 (21), it is mixed with the high-temperature steam after temperature reduction and pressure stabilization in the steam supply pressure stabilizing mixer to stabilize the system's external steam supply parameters. Furthermore, when the steam supply temperature regulating valve CV12 (12) is closed to the minimum valve position during the heat storage process, or when the real-time monitored temperature at the device outlet is greater than the target steam supply temperature (i.e., the steam supply temperature setting value that meets the requirements), the high-temperature gas source heat release switch valve is closed to stop the heat storage steam supply operation mode, and automatically switch to the normal gas source steam supply.

[0076] In one embodiment of the present application, the control mode of the regulating valve in the operation of thermal storage steam supply can be determined according to the steam parameters detected in the above-mentioned multiple real-time detection points. In terms of the control scheme in the above-mentioned embodiment, in this real-time example, the system's external steam supply parameters at any time are measured in real time by the system's external steam supply temperature and pressure measurement point (26), and the external steam supply temperature is t0 and the external steam supply pressure is p0. High-temperature steam t HIt enters the system from the high-temperature gas source inlet (2). A part of it enters the internal heat exchange coil of the adiabatic stratified heat storage device (5) through the steam inlet (6) during the heat storage process of the device. After releasing heat and cooling down, it is led out of the adiabatic stratified heat storage device (5) through the steam outlet (7) during the heat storage process of the device. At this time, the medium inside the device heats up and stores heat, realizing the heat storage function of the system.

[0077] After the high-temperature steam is led out from the steam outlet (7) during the heat storage process of the device, the temperature t1 is monitored in real time by the temperature measuring point (22) at the steam outlet temperature during the heat storage process of the device, and it enters the steam mixer (10) during the heat storage process through the heat storage steam flow regulating valve CV11 (11). At the same time, another part of the high-temperature steam introduced into the system does not pass through the adiabatic stratified heat storage device (5), but directly enters the steam mixer (10) during the heat storage process through the heat storage process steam bypass pipeline (13) through the heat storage process steam supply temperature regulating valve CV12 (12), and is mixed with the steam that has released heat and cooled down.

[0078] During the above-mentioned flow process, the flow regulating valve CV11 (11) is put into automatic operation and operates in a PID closed-loop control mode. The regulating value is the pressure value p measured in real time by the pressure measuring point (23) of the steam supply temperature and pressure during the heat storage process of the device. 10 The heat storage process steam supply temperature regulating valve CV12 (12) is put into automatic operation and operates in a PID closed-loop control mode. The regulating value is the temperature value t measured in real time by the pressure measuring point (23) of the steam supply temperature and pressure during the heat storage process of the device. 10 In this embodiment, p 10 = p0, and t 10 = t0, ensuring that the system can stably supply steam to the outside while storing heat.

[0079] When the heat storage process steam supply temperature regulating valve CV12 (12) has been closed to the minimum valve position, but still t 10 > t0, or the temperature t1 monitored in real time by the temperature measuring point (22) at the steam outlet during the heat storage process of the device is > t0, it indicates that the heat storage capacity of the heat storage medium in the adiabatic stratified heat storage device (5) has reached the standard, and the system cannot further store heat and operate. Then, at this time, the high-temperature gas source heat release switch valve V1 (14) is controlled to close, and the system is heated by the normal gas source.

[0080] When the heat storage steam flow regulating valve CV11 (11) has been opened to the maximum, but still p 10 < p0, it indicates that the flow rate of the high-temperature steam source cannot meet the requirements for supplying steam to the outside. Then, at this time, the normal gas source is introduced into the system and mixed with the above-mentioned high-temperature gas source in the system steam supply pressure stabilizing mixer (20) through the steam supply pressure stabilizing regulating valve CV0 (21). The steam supply pressure stabilizing regulating valve CV0 (21) is put into automatic operation and operates in a PID closed-loop control mode. The regulating value is the pressure value p0 measured in real time by the pressure measuring point (26) of the steam supply temperature and pressure to the outside of the system.

[0081] Therefore, the method realizes the control of the heat storage and steam supply operation of the heat storage type stable steam supply system of the cogeneration, so that the system has the functions of steam heat storage and constant temperature and pressure stable steam supply.

[0082] Figure 4 This is a flow chart of a heat release steam supply operation control method proposed in an embodiment of the present application. Figure 4 As shown, the method comprises the following steps:

[0083] Step S401: Open the low-temperature gas source heat absorption switch valve and close the high-temperature gas source heat release switch valve.

[0084] Specifically, when the system is in the heat release steam supply mode, the low temperature gas source heat absorption switch valve V2 (19) is controlled to open, and the high temperature gas source heat release switch valve V1 (14) is closed to release the low temperature steam t L Introduced into the system by the cogeneration unit.

[0085] Step S402: Control a portion of low-temperature steam to enter the adiabatic stratified heat storage device to absorb heat and heat up, and then pass through the heat release steam flow control valve to mix with another portion of low-temperature steam that directly passes through the heat release process steam supply temperature control valve in the heat release process steam mixer.

[0086] Specifically, a portion of the introduced low-temperature steam enters the adiabatic stratified heat storage device (5) to release heat and increase in temperature (the heat storage medium of the device absorbs heat) to complete the heat release function of the system, and is mixed in the heat release process steam mixer (15) with the low-temperature steam that directly passes through the heat release process steam supply temperature regulating valve CV22 (17) through the heat release steam flow regulating valve CV21 (16) to stabilize the pressure and temperature of the external gas supply.

[0087] Step S403: Based on the PID closed-loop control method, the outlet pressure of the heat release process steam mixer is automatically adjusted by the heat release steam flow regulating valve, and the outlet temperature of the heat release process steam mixer is automatically adjusted by the heat release process steam supply temperature regulating valve.

[0088] Specifically, when the system is operating in the heat release steam supply mode, the heat release steam flow regulating valve CV21 (16) automatically adjusts the stable steam supply pressure, and the heat release process steam supply temperature regulating valve CV22 (17) automatically adjusts the stable steam supply temperature, thereby realizing the stable steam supply function in the heat release process of the system. That is, the steam after absorbing heat through the adiabatic stratified heat storage device (5) passes through the heat release steam flow regulating valve CV21 (16) to stabilize the steam supply pressure, and then enters the heat release process steam mixer (15). Furthermore, this part of the low-temperature steam after heat absorption and pressure stabilization is mixed in the mixer with the low-temperature steam that directly flows through the heat release process steam supply temperature regulating valve CV22 (17) to stabilize the external steam supply temperature. After that, it passes through the low-temperature gas source heat absorption switch valve V2 (19) and enters the system steam supply pressure stabilization mixer (20).

[0089] In specific implementation, when the system is in the heat release steam supply operation mode, the low-temperature gas source heat absorption switch valve is in the open state, and low-temperature steam is introduced into the system. At this time, the heat release steam flow control valve CV21 (16) is put into automatic operation, and operates in a PID closed-loop control mode, and the adjustment value is the outlet pressure of the device's heat release process mixer. Further, the low-temperature steam absorbs heat and heats up through the adiabatic stratified heat storage device (5). If the outlet temperature of the device's heat release process steam is greater than or equal to the steam supply temperature setting value, the low-temperature gas source bypass (18) will introduce part of the low-temperature steam into the heat release process steam mixer. At this time, the heat release steam temperature control valve CV22 (17) is put into automatic operation, and operates in a PID closed-loop control mode, and the adjustment value is the outlet temperature of the device's heat release process mixer.

[0090] In one embodiment of the present application, during the heat release and heating operation, if the steam supply pressure is insufficient, a normal gas source is introduced into the control system. After the normal gas source passes through the steam supply pressure regulating valve CV0 (21), it is mixed with the low-temperature steam after temperature increase and pressure stabilization in the steam supply pressure stabilizing mixer to stabilize the system's external steam supply parameters. Further, when the system is in the heat release and steam supply operation mode, during the heat release process, the steam supply temperature regulating valve CV22 (17) is opened to the maximum valve position, or the real-time monitored temperature at the device outlet is lower than the target steam supply temperature, the low-temperature gas source heat absorption switch valve V2 (19) is controlled to close to stop the heat release and steam supply operation mode, and automatically switch to the normal gas source steam supply.

[0091] In one embodiment of the present application, the control mode of the regulating valve in the heat release steam supply operation can be determined according to the steam parameters detected in the above-mentioned multiple real-time detection points. L The low-temperature gas enters the system through the low-temperature gas source inlet (3), and a portion of the gas enters the heat exchange coil inside the adiabatic stratified heat storage device (5) through the device heat release process steam inlet (8), and after absorbing heat and heating up, it is led out of the adiabatic stratified heat storage device (5) through the device heat release process steam outlet (9). At this time, the medium inside the device cools down and releases heat, realizing the heat release function of the system.

[0092] After the low-temperature steam is drawn out from the heat release process steam outlet (9) of the device, the temperature is monitored at t2 in real time by the heat release process steam outlet temperature measuring point (24) of the device, and enters the heat release process steam mixer (15) through the heat release steam flow regulating valve CV21 (16). At the same time, another part of the low-temperature steam introduced into the system does not pass through the adiabatic stratified heat storage device (5), but directly passes through the heat release process steam supply temperature regulating valve CV22 (17) and is introduced into the heat release process steam mixer (15) through the heat release process steam bypass pipeline (18), and is mixed with the steam that has been heated after absorbing heat.

[0093] During the above-mentioned steam flow process, the heat release steam flow regulating valve CV21(16) is put into automatic operation and operates in a PID closed-loop control mode. The regulated value is the pressure value p measured in real time by the steam supply temperature and pressure measuring point (25) during the heat release process of the device. 20 The heat release process steam supply temperature regulating valve CV22(17) is put into automatic operation and operates in a PID closed-loop control mode. The regulated value is the temperature value t measured in real time by the steam supply temperature and pressure measuring point (25) during the heat release process of the device. 20 In this embodiment, p 20 can be set to p0, and t 20 = t0, ensuring that while the system is operating in heat release, it can also supply steam stably to the outside.

[0094] When the heat release process steam supply temperature regulating valve CV22(17) has been opened to the maximum valve position, but there is still a situation where t 20 < t0, or when the temperature t2 < t0 measured in real time by the steam outlet temperature measuring point (24) during the heat release process of the device, it indicates that the heat release amount of the heat storage medium in the adiabatic stratified heat storage device (5) has reached the maximum, and the system cannot further operate in heat release. At this time, the low-temperature gas source heat absorption switch valve V2(19) is controlled to close, and the system supplies heat from the normal gas source to the outside.

[0095] When the heat release steam flow regulating valve CV21(16) has been opened to the maximum, but there is still a situation where p 20 < p0, it indicates that the flow rate of the low-temperature steam source cannot meet the requirements for supplying steam to the outside. At this time, a normal gas source is introduced into the system and mixed with the above-mentioned low-temperature gas source in the system steam supply pressure stabilizing mixer (20). The steam supply pressure stabilizing regulating valve CV0(21) is put into automatic operation and operates in a PID closed-loop control mode. The regulated value is the pressure value p0 measured in real time by the system steam supply temperature and pressure measuring point (26).

[0096] Thus, this method realizes the control of the heat release and steam supply operation of the combined heat and power generation heat storage type stable steam supply system, enabling the system to have the functions of steam heat release and constant temperature and stable pressure steam supply.

[0097] Based on the above two control methods, this application enables the system to have the functions of steam heat storage / heat release and constant temperature and stable pressure steam supply through the optimized control method of the regulating valve, and finally enables the combined heat and power generation unit to realize heat storage peak shaving operation without affecting the steam supply quality. In the above embodiment, the temperature t of the normal gas source M = t0, the temperature t of the high-temperature gas source H > t0, and the temperature t of the low-temperature gas source L < t0.

[0098] It should be noted that in the control method of the embodiment of the present application, when it is necessary to adjust the system's external steam supply parameters, it is only necessary to adjust the automatic target values ​​of the heat storage steam flow control valve CV11 (11) and the heat release steam flow control valve CV21 (16) to new external steam supply pressure parameters; adjust the automatic target values ​​of the heat storage process steam supply temperature control valve CV12 (12) and the heat release process steam supply temperature control valve CV22 (17) to new external steam supply temperature parameters; and adjust the automatic target value of the steam supply stabilizing pressure control valve CV0 (21) to new external steam supply pressure parameters, so that the cogeneration heat storage type stable steam supply system can operate autonomously and achieve a new stable operating state.

[0099] In summary, the control method of the heat storage type stable steam supply system of the cogeneration implemented in this application, through the optimization control method of the regulating valve, enables the system to have the functions of steam heat storage / heat release and constant temperature and pressure steam supply at the same time, and finally enables the cogeneration unit to achieve heat storage peak operation without affecting the quality of steam supply. In the heat storage and heat release stages, only by adjusting the three different parameter levels of steam flow drawn from the original unit thermal system, the functions of steam heat storage and stable steam supply are realized, and the impact on the original unit thermal system is small. When the system operating conditions change, the original unit thermal system can adjust autonomously and re-establish thermal balance without human intervention, which greatly reduces the complexity of system operation. The control logic is clear and simple, the hardware cost is low, and it is easy to implement in practical applications. In addition, all operation control functions in this application are completed by the regulating valve, which has continuous adjustability, especially when the system normal steam supply, heat storage steam supply, heat release steam supply and other operating conditions are switched, there will be no sudden change in the operating parameters, which ensures the feasibility of the system's non-disturbance switching and minimizes the impact of the system's changing conditions on the original system. Since the system has the function of non-disturbance switching of operating conditions, the system can be started or stopped at any time in any operating mode, and can still maintain stable operation of external steam supply during the switching process, which greatly enhances the flexibility of system operation. The function of the system to supply steam with stable external parameters is the result of the joint action of multiple regulating valves. When the various regulating valves are modified and adjusted to follow the set value, the system's external steam supply parameters can be changed, which improves the flexibility of system operation and ensures the stability and reliability of external heat supply.

[0100] In order to implement the above embodiments, the present application also proposes a non-temporary computer-readable storage medium storing a computer program, which, when executed by a processor, implements the control method of the cogeneration heat storage type stable steam supply system proposed in the above embodiments of the present application.

[0101] It should be noted that it should be understood that the various parts of the present application can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, multiple steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0102] In addition, in the description of the present application, the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0103] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0104] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0105] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0106] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A heat and power cogeneration thermal storage type stable steam supply system, characterized in that: include: Normal gas source inlet, high temperature gas source inlet, low temperature gas source inlet, adiabatic stratified heat storage device, heat storage process steam mixer, heat storage steam flow regulating valve, heat storage process steam supply temperature regulating valve, high temperature gas source heat release switch valve, heat release process steam mixer, heat release steam flow regulating valve, heat release process steam supply temperature regulating valve, low temperature gas source heat absorption switch valve, system steam supply pressure stabilizing mixer and steam supply pressure stabilizing regulating valve, the adiabatic stratified heat storage device includes: a device heat storage process steam inlet, a device heat storage process steam outlet, a device heat release process steam inlet and a device heat release process steam outlet, wherein, The high-temperature gas source inlet is connected to the heat storage process steam inlet of the device, and the high-temperature gas source inlet is also connected to the first end of the heat storage process steam supply temperature regulating valve through a heat storage process steam bypass pipeline; The heat storage process steam outlet of the device is connected to the first end of the heat storage steam flow regulating valve, the second end of the heat storage steam flow regulating valve is connected to the first end of the heat storage process steam mixer, the second end of the heat storage process steam supply temperature regulating valve is connected to the second end of the heat storage process steam mixer, and the third end of the heat storage process steam mixer is connected to the first end of the high-temperature gas source heat release switch valve; The low-temperature gas source inlet is connected to the heat release process steam inlet of the device, and the low-temperature gas source inlet is also connected to the first end of the heat release process steam supply temperature regulating valve through a heat release process steam bypass pipeline; The heat release process steam outlet of the device is connected to the first end of the heat release steam flow regulating valve, the second end of the heat release steam flow regulating valve is connected to the first end of the heat release process steam mixer, the second end of the heat release process steam supply temperature regulating valve is connected to the second end of the heat release process steam mixer, and the third end of the heat release process steam mixer is connected to the first end of the low-temperature gas source heat absorption switch valve; The second end of the high-temperature gas source exothermic switch valve and the second end of the low-temperature gas source endothermic switch valve are connected to the first end of the system steam supply and pressure stabilizing mixer, the normal gas source inlet is connected to the first end of the steam supply and pressure stabilizing regulating valve, the second end of the steam supply and pressure stabilizing regulating valve is connected to the second end of the system steam supply and pressure stabilizing mixer, and the third end of the system steam supply and pressure stabilizing mixer is connected to the system external steam supply main pipe.

2. The heat and power cogeneration thermal storage type stable steam supply system according to claim 1, characterized in that: in, A device heat storage process steam outlet temperature measuring point is provided between the device heat storage process steam outlet and the first end of the heat storage steam flow regulating valve; A heat storage process steam supply temperature and pressure measuring point is provided between the third end of the heat storage process steam mixer and the first end of the high-temperature gas source heat release switch valve; A device heat release process steam outlet temperature measuring point is provided between the device heat release process steam outlet and the first end of the heat release steam flow regulating valve; A heat release process steam supply temperature and pressure measuring point is provided between the third end of the heat release process steam mixer and the first end of the low-temperature gas source heat absorption switch valve; The external steam supply main pipe is provided with system external steam supply temperature and pressure measuring points.

3. The heat and power cogeneration thermal storage type stable steam supply system according to claim 1, characterized in that: The normal gas source inlet, the high-temperature gas source inlet and the low-temperature gas source inlet are used to transmit the normal gas source, high-temperature gas source and low-temperature gas source introduced from the thermal system of the cogeneration unit into the cogeneration heat storage type stable steam supply system accordingly; wherein, the parameters of the normal gas source are the target parameters of the cogeneration heat storage type stable steam supply system for external gas supply, the parameters of the high-temperature gas source are higher than the target parameters, and the parameters of the low-temperature gas source are lower than the target parameters.

4. A control method for a heat and power cogeneration thermal storage type stable steam supply system, characterized in that: The combined heat and power thermal storage type stable steam supply system is a combined heat and power thermal storage type stable steam supply system as claimed in any one of claims 1 to 3, and the control method comprises the following steps: Determine the current operating status of the cogeneration unit; When the cogeneration unit is in normal operation, the high-temperature gas source heat release switch valve and the low-temperature gas source heat absorption switch valve are closed, and the normal gas source introduced is regulated through the steam supply pressure regulating valve; When the cogeneration unit is in a peak load state, the gas supply operation mode of the cogeneration heat storage type stable steam supply system is determined with the goal of stabilizing the external gas supply parameters of the system; The heat and power cogeneration thermal storage type stable steam supply system is controlled to execute a heat storage steam supply operation mode or a heat release steam supply operation mode according to the determination result.

5. The control method according to claim 4, characterized in that: The controlling the heat and power cogeneration thermal storage type stable steam supply system to execute the thermal storage steam supply operation mode includes: Open the high-temperature gas source heat release switch valve and close the low-temperature gas source heat absorption switch valve; A portion of high-temperature steam is controlled to enter the adiabatic stratified heat storage device to release heat and cool down, and then passes through the heat storage steam flow control valve and is mixed with another portion of high-temperature steam that directly passes through the heat storage process steam supply temperature control valve in the heat storage process steam mixer; Based on the PID closed-loop control method, the outlet pressure of the heat storage process steam mixer is automatically adjusted by the heat storage steam flow regulating valve, and the outlet temperature of the heat storage process steam mixer is automatically adjusted by the heat storage process steam supply temperature regulating valve.

6. The control method according to claim 4, characterized in that: The controlling the heat and power cogeneration thermal storage type stable steam supply system to execute the heat release steam supply operation mode includes: Open the low-temperature gas source heat-absorbing switch valve and close the high-temperature gas source heat-releasing switch valve; A portion of low-temperature steam is controlled to enter the adiabatic stratified heat storage device to absorb heat and heat up, and then passes through the heat release steam flow control valve and is mixed with another portion of low-temperature steam that directly passes through the heat release process steam supply temperature control valve in the heat release process steam mixer; Based on the PID closed-loop control method, the outlet pressure of the heat release process steam mixer is automatically adjusted by the heat release steam flow regulating valve, and the outlet temperature of the heat release process steam mixer is automatically adjusted by the heat release process steam supply temperature regulating valve.

7. The control method according to claim 5, characterized in that: Also includes: When the steam supply temperature regulating valve is closed to the minimum valve position during the heat storage process, or the real-time monitored temperature at the device outlet is greater than the target steam supply temperature, the high-temperature gas source heat release switch valve is closed to stop the heat storage steam supply operation mode, and automatically switch to normal gas source steam supply.

8. The control method according to claim 6, characterized in that: Also includes: During the heat release process, the steam supply temperature regulating valve is opened to the maximum valve position, or the real-time monitored temperature at the device outlet is lower than the target steam supply temperature, the low-temperature gas source heat absorption switch valve is closed to stop the heat release steam supply operation mode, and automatically switch to normal gas source steam supply.

9. The control method according to claim 4, characterized in that: Also includes: During the execution of the heat storage steam supply operation mode or the heat release steam supply operation mode, if the output high-temperature steam flow rate or low-temperature steam flow rate cannot meet the external steam supply pressure requirement, a normal gas source is introduced, and the normal gas source is controlled to pass through the steam supply pressure stabilizing regulating valve and mix with the steam after heat release or heat absorption in the system steam supply pressure stabilizing mixer to maintain the steam supply pressure stable.

10. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the control method of the combined heat and power thermal storage type stable steam supply system as described in any one of claims 4 to 9 is implemented.

Images