Compressed air energy storage air turbine exhaust temperature control system and method

Abstract

The invention relates to an exhaust temperature control system and method for a compressed air energy storage air turbine, and the system comprises a main loop control system which is used for obtaining feed-forward influence parameters and model characteristic parameters of the exhaust temperature of the air turbine, and the feed-forward influence parameters comprise a low-pressure cylinder air inlet temperature theoretical value and a low-pressure heat exchange system heat storage medium flow theoretical value; according to the difference between the low-pressure cylinder exhaust temperature set value and the low-pressure cylinder exhaust temperature actual value, a low-pressure heat exchange system heat storage medium flow set value is output; the auxiliary loop control system is used for controlling the opening degree of a temperature regulating valve of the low-pressure heat exchange system through a PID (Proportion Integration Differentiation) controller so as to regulate and control the air inlet temperature of a low-pressure cylinder; and the low-pressure cylinder system comprises a low-pressure cylinder and a low-pressure heat exchange system. According to the compressed air energy storage air turbine exhaust temperature control system and method, the response rate of the air turbine exhaust temperature in the initial stage can be effectively increased, response delay is improved, and parameter fluctuation is reduced in the temperature adjusting process.

Description

Technical Field

[0001] The present application relates to the field of air energy storage technology, and in particular to a compressed air energy storage air turbine exhaust temperature control system and method. Background Art

[0002] Compressed air energy storage is an advanced technology that stores energy through compressed air. It has the advantages of large capacity and long service life. As an efficient and sustainable energy storage method, it has broad application prospects in the utilization of renewable energy.

[0003] Compressed air energy storage can realize the trigeneration of cooling, heat and electricity of the energy storage system, and has the advantages of high energy storage efficiency, small system size and environmental friendliness. By adjusting the exhaust temperature of the air turbine of compressed air energy storage, it can be used for heating and cooling needs in life or production. However, the heat exchange system of compressed air energy storage has problems such as large inertia and large delay, and the temperature control is difficult. The existing control accuracy cannot meet the actual needs. Therefore, it is necessary to study a compressed air energy storage air turbine exhaust temperature control system and method to cope with the shortcomings of the existing technology and realize the trigeneration of cooling, heat and electricity of compressed air energy storage. Summary of the invention

[0004] The purpose of the embodiments of the present application is to provide a compressed air energy storage air turbine exhaust temperature control system and method, which can effectively improve the initial response rate of the air turbine exhaust temperature, improve the response delay, and reduce parameter fluctuations during the temperature regulation process.

[0005] To achieve the above objectives, this application provides the following technical solutions:

[0006] In a first aspect, the present application provides a compressed air energy storage air turbine exhaust temperature control system, the control system comprising a main circuit control system, a secondary circuit control system and a low-pressure cylinder system;

[0007] The low-pressure cylinder system comprises a low-pressure cylinder and a low-pressure heat exchange system;

[0008] The main loop control system is used to obtain the feedforward influencing parameters and model characteristic parameters of the air turbine exhaust temperature, and to build a model according to the feedforward influencing parameters and the model characteristic parameters, and output a set value of the heat storage medium flow rate of the low-pressure heat exchange system, wherein the feedforward influencing parameters include the low-pressure cylinder intake temperature and the generator power, and the model characteristic parameters include the theoretical value of the low-pressure cylinder intake temperature, the theoretical value of the heat storage medium flow rate of the low-pressure heat exchange system, and the deviation between the set value of the low-pressure cylinder exhaust temperature and the actual value of the low-pressure cylinder exhaust temperature;

[0009] The secondary loop control system is used to obtain the actual value of the heat storage medium flow rate of the low-pressure heat exchange system and control the opening of the temperature regulating valve of the low-pressure heat exchange system according to the set value of the heat storage medium flow rate of the low-pressure heat exchange system and the PID controller, so as to realize the regulation of the intake temperature of the low-pressure cylinder;

[0010] A low-pressure cylinder intake pressure gauge and a low-pressure cylinder intake temperature gauge are provided between the low-pressure heat exchange system and the low-pressure cylinder;

[0011] The outlet of the low-pressure cylinder is provided with a low-pressure cylinder exhaust pressure gauge and a low-pressure cylinder exhaust temperature gauge;

[0012] A low-pressure heat exchange system heat storage medium flowmeter is provided between the low-pressure heat exchange system heat storage medium and the low-pressure heat exchange system;

[0013] A generator power meter is provided at the generator outlet;

[0014] The low-pressure cylinder intake pressure gauge, low-pressure cylinder intake temperature gauge, low-pressure cylinder exhaust pressure gauge, low-pressure cylinder exhaust temperature gauge, low-pressure heat exchange system heat storage medium flow meter and generator power meter are all connected to the parameter acquisition module;

[0015] The low-pressure heat exchange system temperature regulating valve is used to adjust the flow rate of heat storage medium in the low-pressure heat exchange system;

[0016] The heat storage medium of the low-pressure heat exchange system is water or heat transfer oil.

[0017] The calculation method of the theoretical value of the low-pressure cylinder intake temperature is:

[0018]

[0019] T lgi =T lgi (H lgi , P lgi )

[0020] Among them, T lgi is the theoretical value of the low-pressure cylinder intake temperature, η lg is the low pressure cylinder efficiency, P lgi is the intake pressure of the low pressure cylinder, H lgi is the intake enthalpy of the low pressure cylinder, S lgi is the low pressure cylinder intake entropy, P lge is the exhaust pressure of the low pressure cylinder, T lge is the exhaust temperature of the low pressure cylinder, H l ' ge is the isentropic exhaust enthalpy of the low-pressure cylinder, H lge is the exhaust enthalpy of the low pressure cylinder;

[0021] The calculation method of the theoretical value of the heat storage medium flow rate of the low-pressure heat exchange system is:

[0022]

[0023] Among them, F hot is the theoretical value of the heat storage medium flow rate of the low-pressure heat exchange system, P is the generator power, P e is the rated power of the generator, T lgi is the theoretical value of the low-pressure cylinder intake temperature, T lgie is the rated value of the low pressure cylinder intake temperature, F hote It is the rated value of heat storage medium flow rate of low-pressure heat exchange system at rated power of generator.

[0024] In a second aspect, the present application provides a method for controlling the exhaust temperature of a compressed air energy storage air turbine, using the system as described above, the control method comprising the following steps:

[0025] (1) Under the condition of putting the low-pressure cylinder exhaust temperature control loop into operation, the feedforward influencing parameters are obtained from the low-pressure cylinder system;

[0026] (2) Taking the low-pressure cylinder efficiency, low-pressure cylinder intake pressure, low-pressure cylinder exhaust pressure, and low-pressure cylinder exhaust temperature as input variables, output the theoretical value of the low-pressure cylinder intake temperature;

[0027] (3) Taking the theoretical value of the low-pressure cylinder intake temperature, the generator power, the rated value of the generator power, the rated value of the low-pressure cylinder intake temperature, and the rated value of the heat storage medium flow rate of the low-pressure heat exchange system at the rated power of the generator as input variables, the theoretical value of the heat storage medium flow rate of the low-pressure heat exchange system is output;

[0028] (4) Taking the theoretical value of the low-pressure cylinder intake temperature, the theoretical value of the heat storage medium flow rate of the low-pressure heat exchange system, the deviation between the set value of the low-pressure cylinder exhaust temperature and the actual value of the low-pressure cylinder exhaust temperature as characteristic variables, the main loop control system calculates the set value of the heat storage medium flow rate of the low-pressure heat exchange system;

[0029] (5) Sending the set value of the heat storage medium flow rate of the low-pressure heat exchange system to the secondary loop PID controller to track and adjust the heat storage medium flow rate of the low-pressure heat exchange system;

[0030] (6) When the temperature regulating valve of the low-pressure heat exchange system is in the automatic state, the secondary loop PID controller calculates the change in the opening of the temperature regulating valve of the low-pressure heat exchange system according to the change in the set value of the heat storage medium flow rate of the low-pressure heat exchange system, so as to control the heat storage medium flow rate of the low-pressure heat exchange system, and then adjust the intake temperature of the low-pressure cylinder, and finally achieve a rapid response of the exhaust temperature of the low-pressure cylinder.

[0031] Compared with the prior art, the beneficial effects of the present invention are: by adopting the setting of the main and auxiliary control loops, the theoretical value of the low-pressure cylinder intake temperature and the theoretical value of the heat storage medium flow rate of the low-pressure heat exchange system are output through the model, and the set value of the heat storage medium flow rate of the low-pressure heat exchange system is quickly adjusted, which can effectively improve the initial response rate of the air turbine exhaust temperature, improve the lag problem caused by the large inertia and large delay of the heat exchange system, improve the response delay, and effectively reduce the overshoot in the later adjustment process, thereby improving the stability of the exhaust temperature regulation. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application 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.

[0033] Figure 1 It is a working flow chart of the control system of this application.

[0034] Figure 2 It is a schematic diagram of the system structure of this application.

[0035] Figure 3 It is a schematic diagram of the simulation results of this application.

[0036] Figure 1 In the middle: 1- is the salt cavern, 2- is the temperature regulating valve of the high-pressure heat exchange system, 3- is the high-pressure heat exchange system, 4- is the high-pressure cylinder, 5- is the air intake regulating valve of the high-pressure cylinder, 6- is the temperature regulating valve of the low-pressure heat exchange system, 7- is the heat storage medium flowmeter of the low-pressure heat exchange system, 8- is the air intake pressure gauge of the low-pressure cylinder, 9- is the air intake temperature gauge of the low-pressure cylinder, 10- is the low-pressure heat exchange system, 11- is the air intake regulating valve of the low-pressure cylinder, 12- is the low-pressure cylinder, 13- is the power meter of the generator, 14- is the generator, 15- is the temperature regulating valve of the medium-pressure heat exchange system, 16- is the medium-pressure heat exchange system, 17- is the air intake regulating valve of the medium-pressure cylinder, 18- is the medium-pressure cylinder, 19- is the exhaust pressure gauge of the low-pressure cylinder, and 20- is the exhaust temperature gauge of the low-pressure cylinder. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0038] The terms "comprises," "comprising," or any other variation thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element.

[0039] The terms "first", "second", etc. are only used to distinguish one entity or operation from another entity or operation, and should not be understood as indicating or implying relative importance, nor should they be understood as requiring or implying any such actual relationship or order between these entities or operations.

[0040] Compressed air energy storage has the advantages of high energy storage efficiency, small system size, and environmental friendliness, and can achieve trigeneration of cooling, heat, and electricity. However, the heat exchange system of compressed air energy storage has problems such as large inertia, large delay, and difficulty in temperature control. The existing control accuracy cannot meet user requirements. Therefore, it is necessary to study a compressed air energy storage air turbine exhaust temperature control system and method to meet the trigeneration of cooling, heat, and electricity of compressed air energy storage.

[0041] The present application provides a compressed air energy storage air turbine exhaust temperature control system and method, which adopts the setting of main and auxiliary control loops, outputs the theoretical value of the low-pressure cylinder intake temperature and the theoretical value of the heat storage medium flow of the low-pressure heat exchange system through the model, and quickly adjusts the set value of the heat storage medium flow of the low-pressure heat exchange system. It can effectively improve the initial response rate of the air turbine exhaust temperature, improve the lag problem caused by the large inertia and large delay of the heat exchange system, and meet the control needs of the trigeneration of cooling, heat and electricity of compressed air energy storage.

[0042] like Figure 1 , Figure 2 As shown, a compressed air energy storage air turbine exhaust temperature control system of the present application, the control system includes a main circuit control system, a secondary circuit control system and a low-pressure cylinder system;

[0043] The low-pressure cylinder system comprises a low-pressure cylinder and a low-pressure heat exchange system;

[0044] The main loop control system is used to obtain the feedforward influencing parameters and model characteristic parameters of the air turbine exhaust temperature, and to build a model according to the feedforward influencing parameters and the model characteristic parameters, and output a set value of the heat storage medium flow rate of the low-pressure heat exchange system, wherein the feedforward influencing parameters include the low-pressure cylinder intake temperature and the generator power, and the model characteristic parameters include the theoretical value of the low-pressure cylinder intake temperature, the theoretical value of the heat storage medium flow rate of the low-pressure heat exchange system, and the deviation between the set value of the low-pressure cylinder exhaust temperature and the actual value of the low-pressure cylinder exhaust temperature;

[0045] The secondary loop control system is used to obtain the actual value of the heat storage medium flow rate of the low-pressure heat exchange system and control the opening of the temperature regulating valve of the low-pressure heat exchange system according to the set value of the heat storage medium flow rate of the low-pressure heat exchange system and the PID controller, so as to realize the regulation of the intake temperature of the low-pressure cylinder;

[0046] The calculation method of the theoretical value of the low-pressure cylinder intake temperature is:

[0047]

[0048] T lgi =T lgi (H lgi , P lgi )

[0049] Among them, T lgi is the theoretical value of the low-pressure cylinder intake temperature, η lg is the efficiency of the low-pressure cylinder, taking 90% of the design value, P lgi is the intake pressure of the low pressure cylinder, H lgi is the intake enthalpy of the low pressure cylinder, S lgi is the low pressure cylinder intake entropy, P lge is the exhaust pressure of the low pressure cylinder, T lge is the exhaust temperature of the low pressure cylinder, H l ' ge is the isentropic exhaust enthalpy of the low-pressure cylinder, H lge is the exhaust enthalpy of the low-pressure cylinder; for example, if the exhaust temperature of the low-pressure cylinder needs to be adjusted to 25°C, the exhaust enthalpy of the low-pressure cylinder is 25.13 kJ / kg, then the intake enthalpy of the low-pressure cylinder is 154.98 kJ / kg, the intake entropy of the low-pressure cylinder is 6.82 kJ / kg·K, and the theoretical value of the intake temperature of the low-pressure cylinder is 153.51°C; if the exhaust temperature of the low-pressure cylinder needs to be adjusted to 20°C, the exhaust enthalpy of the low-pressure cylinder is 20.10 kJ / kg, then the intake enthalpy of the low-pressure cylinder is 147.78 kJ / kg, the intake entropy of the low-pressure cylinder is 6.820 kJ / kg·K, and the theoretical value of the intake temperature of the low-pressure cylinder is 146.44°C;

[0050] The calculation method of the theoretical value of the heat storage medium flow rate of the low-pressure heat exchange system is:

[0051]

[0052] Among them, F hot is the theoretical value of the heat storage medium flow rate of the low-pressure heat exchange system, P is the generator power, P e is the rated power of the generator, using the design value of 300MW, T lgi is the theoretical value of the low-pressure cylinder intake temperature, T lgie is the rated value of the low pressure cylinder inlet temperature, using the design value of 170℃, F hoteThe rated value of the heat storage medium flow rate of the low-pressure heat exchange system under the rated power of the generator is 697t / h, and the design value is 697t / h; for example, if the exhaust temperature of the low-pressure cylinder needs to be adjusted to 25℃ and the generator power is 270MW, the theoretical value of the heat storage medium flow rate of the low-pressure heat exchange system is 566t / h; if the exhaust temperature of the low-pressure cylinder needs to be adjusted to 20℃ and the generator power is 270MW, the theoretical value of the heat storage medium flow rate of the low-pressure heat exchange system is 540t / h;

[0053] A low-pressure cylinder intake pressure gauge and a low-pressure cylinder intake temperature gauge are provided between the low-pressure heat exchange system and the low-pressure cylinder;

[0054] The low-pressure cylinder outlet is provided with a low-pressure cylinder exhaust pressure gauge and a low-pressure cylinder exhaust temperature gauge;

[0055] A low-pressure heat exchange system heat storage medium flowmeter is provided between the low-pressure heat exchange system heat storage medium and the low-pressure heat exchange system;

[0056] The generator outlet is provided with a generator power meter;

[0057] The low-pressure cylinder intake pressure gauge, low-pressure cylinder intake temperature gauge, low-pressure cylinder exhaust pressure gauge, low-pressure cylinder exhaust temperature gauge, low-pressure heat exchange system heat storage medium flow meter and generator power meter are all connected to the parameter acquisition module;

[0058] The low-pressure heat exchange system temperature regulating valve is used to adjust the flow rate of heat storage medium in the low-pressure heat exchange system;

[0059] The heat storage medium of the low-pressure heat exchange system is water or heat transfer oil.

[0060] A method for controlling the exhaust temperature of a compressed air energy storage air turbine is provided, using the system as described above, and the control method comprises the following steps:

[0061] (1) Under the condition of putting the low-pressure cylinder exhaust temperature control loop into operation, the feedforward influencing parameters are obtained from the low-pressure cylinder system;

[0062] (2) Taking the low-pressure cylinder efficiency, low-pressure cylinder intake pressure, low-pressure cylinder exhaust pressure, and low-pressure cylinder exhaust temperature as input variables, output the theoretical value of the low-pressure cylinder intake temperature;

[0063] (3) Taking the theoretical value of the low-pressure cylinder intake temperature, the generator power, the rated value of the generator power, the rated value of the low-pressure cylinder intake temperature, and the rated value of the heat storage medium flow rate of the low-pressure heat exchange system at the rated power of the generator as input variables, the theoretical value of the heat storage medium flow rate of the low-pressure heat exchange system is output;

[0064] (4) Taking the theoretical value of the low-pressure cylinder intake temperature, the theoretical value of the heat storage medium flow rate of the low-pressure heat exchange system, the deviation between the set value of the low-pressure cylinder exhaust temperature and the actual value of the low-pressure cylinder exhaust temperature as characteristic variables, the main loop control system calculates the set value of the heat storage medium flow rate of the low-pressure heat exchange system;

[0065] (5) Sending the set value of the heat storage medium flow rate of the low-pressure heat exchange system to the secondary loop PID controller to track and adjust the heat storage medium flow rate of the low-pressure heat exchange system;

[0066] (6) When the temperature regulating valve of the low-pressure heat exchange system is in the automatic state, the secondary loop PID controller calculates the change in the opening of the temperature regulating valve of the low-pressure heat exchange system according to the change in the set value of the heat storage medium flow rate of the low-pressure heat exchange system, so as to control the heat storage medium flow rate of the low-pressure heat exchange system, and then adjust the intake temperature of the low-pressure cylinder, and finally achieve a rapid response of the exhaust temperature of the low-pressure cylinder.

[0067] like Figure 3 As shown, a schematic diagram of the simulation results of the compressed air energy storage air turbine exhaust temperature control of the present application is shown. Figure 3 It can be known that the present application adopts the setting of the main and auxiliary control loops, outputs the theoretical value of the low-pressure cylinder intake temperature and the theoretical value of the heat storage medium flow of the low-pressure heat exchange system through the model, and quickly adjusts the set value of the heat storage medium flow of the low-pressure heat exchange system, thereby solving the lag problem caused by the large inertia and large delay of the existing heat exchange system, and can effectively improve the initial response rate of the air turbine exhaust temperature, improve the response delay, and reduce the fluctuation of parameters during the temperature adjustment process.

[0068] The above description is only an embodiment of the present application and is not intended to limit the protection scope of the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A compressed air energy storage air turbine exhaust temperature control system, characterized in that: The control system includes a main circuit control system, a secondary circuit control system and a low-pressure cylinder system; The low-pressure cylinder system comprises a low-pressure cylinder and a low-pressure heat exchange system; The main loop control system is used to obtain the feedforward influencing parameters and model characteristic parameters of the air turbine exhaust temperature, and to build a model according to the feedforward influencing parameters and the model characteristic parameters, and output a set value of the heat storage medium flow rate of the low-pressure heat exchange system, wherein the feedforward influencing parameters include the low-pressure cylinder intake temperature and the generator power, and the model characteristic parameters include the theoretical value of the low-pressure cylinder intake temperature, the theoretical value of the heat storage medium flow rate of the low-pressure heat exchange system, and the deviation between the set value of the low-pressure cylinder exhaust temperature and the actual value of the low-pressure cylinder exhaust temperature; The secondary loop control system is used to obtain the actual value of the heat storage medium flow rate of the low-pressure heat exchange system and control the opening of the temperature regulating valve of the low-pressure heat exchange system according to the set value of the heat storage medium flow rate of the low-pressure heat exchange system and the PID controller, so as to realize the regulation of the intake temperature of the low-pressure cylinder; A low-pressure cylinder intake pressure gauge and a low-pressure cylinder intake temperature gauge are provided between the low-pressure heat exchange system and the low-pressure cylinder; The outlet of the low-pressure cylinder is provided with a low-pressure cylinder exhaust pressure gauge and a low-pressure cylinder exhaust temperature gauge; A low-pressure heat exchange system heat storage medium flowmeter is provided between the low-pressure heat exchange system heat storage medium and the low-pressure heat exchange system; A generator power meter is provided at the generator outlet; The low-pressure cylinder intake pressure gauge, low-pressure cylinder intake temperature gauge, low-pressure cylinder exhaust pressure gauge, low-pressure cylinder exhaust temperature gauge, low-pressure heat exchange system heat storage medium flow meter and generator power meter are all connected to the parameter acquisition module; The low-pressure heat exchange system temperature regulating valve is used to adjust the flow rate of heat storage medium in the low-pressure heat exchange system; The heat storage medium of the low-pressure heat exchange system is water or heat transfer oil.

2. A compressed air energy storage air turbine exhaust temperature control system according to claim 1, characterized in that: The calculation method of the theoretical value of the low-pressure cylinder intake temperature is: T lgi =T lgi (H lgi ,P lgi ) Among them, T lgi is the theoretical value of the low-pressure cylinder intake temperature, η lg is the low pressure cylinder efficiency, P lgi is the intake pressure of the low pressure cylinder, H lgi is the intake enthalpy of the low pressure cylinder, S lgi is the low pressure cylinder intake entropy, P lge is the exhaust pressure of the low pressure cylinder, T lge is the exhaust temperature of the low pressure cylinder, H l ' ge is the isentropic exhaust enthalpy of the low-pressure cylinder, H lge is the exhaust enthalpy of the low pressure cylinder; The calculation method of the theoretical value of the heat storage medium flow rate of the low-pressure heat exchange system is: Among them, F hot is the theoretical value of the heat storage medium flow rate of the low-pressure heat exchange system, P is the generator power, P e is the rated power of the generator, T lgi is the theoretical value of the low-pressure cylinder intake temperature, T lgie is the rated value of the low pressure cylinder intake temperature, F hote It is the rated value of heat storage medium flow rate of low-pressure heat exchange system at rated power of generator.

3. A method for controlling the exhaust temperature of a compressed air energy storage air turbine, using the system as claimed in claim 1 or 2, characterized in that: The control method comprises the following steps: (1) Under the condition of putting the low-pressure cylinder exhaust temperature control loop into operation, the feedforward influencing parameters are obtained from the low-pressure cylinder system; (2) Taking the low-pressure cylinder efficiency, low-pressure cylinder intake pressure, low-pressure cylinder exhaust pressure, and low-pressure cylinder exhaust temperature as input variables, output the theoretical value of the low-pressure cylinder intake temperature; (3) Taking the theoretical value of the low-pressure cylinder intake temperature, the generator power, the rated value of the generator power, the rated value of the low-pressure cylinder intake temperature, and the rated value of the heat storage medium flow rate of the low-pressure heat exchange system at the rated power of the generator as input variables, the theoretical value of the heat storage medium flow rate of the low-pressure heat exchange system is output; (4) Taking the theoretical value of the low-pressure cylinder intake temperature, the theoretical value of the heat storage medium flow rate of the low-pressure heat exchange system, the deviation between the set value of the low-pressure cylinder exhaust temperature and the actual value of the low-pressure cylinder exhaust temperature as characteristic variables, the main loop control system calculates the set value of the heat storage medium flow rate of the low-pressure heat exchange system; (5) Sending the set value of the heat storage medium flow rate of the low-pressure heat exchange system to the secondary loop PID controller to track and adjust the heat storage medium flow rate of the low-pressure heat exchange system; (6) When the temperature regulating valve of the low-pressure heat exchange system is in the automatic state, the secondary loop PID controller calculates the change in the opening of the temperature regulating valve of the low-pressure heat exchange system according to the change in the set value of the heat storage medium flow rate of the low-pressure heat exchange system, so as to control the heat storage medium flow rate of the low-pressure heat exchange system, and then adjust the intake temperature of the low-pressure cylinder, and finally achieve a rapid response of the exhaust temperature of the low-pressure cylinder.

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