Biomass coupling combustion steam temperature control feedforward setting method and device

Abstract

The application discloses a biomass coupling combustion steam temperature control feedforward setting method and device, and the method comprises the following steps: multiplying the value after biomass fuel quantity conversion through a first function generator and the value after unit actual load conversion through a second function generator to form a first feedforward basic quantity; forming a second feedforward basic quantity through a biomass weighing belt running state feedback value; forming a third feedforward basic quantity through a biomass burner inlet aerodynamic plug door full-closed state; multiplying the first feedforward basic quantity and the second feedforward basic quantity, and then multiplying the third feedforward basic quantity, and sequentially passing through two inertia modules to output a steam temperature control feedforward impulse; the application has the advantages that the steam temperature control feedforward impulse is outputted, abnormal disturbance of steam temperature in biomass coupling combustion is relieved, and the unit can keep a stable state.

Description

Technical Field

[0001] This invention relates to thermal process control, and more specifically to a method and apparatus for setting feedforward for biomass coupled combustion steam temperature control. Background Technology

[0002] my country possesses abundant biomass resources with enormous potential for utilization. Energy development plans mandate mastering coal-fired power generation coupled with biomass combustion technology, further improving the technological upgrading of existing coal-fired power plants, and gaining operational experience from such retrofits. Some power generation companies have actively responded by retrofitting their existing supercritical thermal power units with biomass co-combustion. However, due to limited experience in applying biomass fuel preparation and transportation systems in thermal power units, coupled with the inherent characteristics of biomass fuel, operational instability of biomass equipment is increased. This can lead to significant fluctuations in biomass fuel quantity during co-combustion due to equipment limitations, potentially causing substantial steam temperature disturbances. To mitigate these abnormal steam temperature disturbances during biomass co-combustion, temperature control is necessary within the thermal power units.

[0003] Chinese patent publication CN114719279A discloses a biomass-co-fired boiler system and combustion control method, which involves crushing biomass materials into biomass pellets; using flue gas generated by the biomass boiler to transport the biomass pellets to the burnout air zone, primary air zone, and cold ash hopper zone within the biomass boiler. When the flue gas carrying the biomass pellets enters the boiler body, it serves as recirculated flue gas, which can alter the boiler's combustion conditions, the heat absorption ratio of each heating surface, and regulate the steam temperature. However, it does not provide a specific method for controlling the steam temperature during the biomass-co-fired combustion process in thermal power units, and therefore cannot mitigate abnormal steam temperature fluctuations during biomass-co-fired combustion. Summary of the Invention

[0004] The technical problem to be solved by the present invention is how to provide a feedforward setting method for biomass coupled combustion steam temperature control, so as to alleviate abnormal disturbances in steam temperature during biomass coupled combustion and keep the unit in a stable state.

[0005] This invention solves the above-mentioned technical problems through the following technical means: a biomass coupled combustion steam temperature control feedforward setting method, the method comprising:

[0006] The value of biomass fuel quantity after conversion by the first function generator is multiplied by the value of the actual unit load after conversion by the second function generator to form the first feedforward basic quantity;

[0007] The feedback value of the operating status of the biomass weighing belt forms the second feedforward basic quantity;

[0008] The third feedforward basic quantity is formed when the pneumatic gate at the inlet of the biomass burner is fully closed.

[0009] The first feedforward basic quantity is multiplied by the second feedforward basic quantity, and then multiplied by the third feedforward basic quantity. The result of the multiplication passes through two inertial modules in sequence to output the temperature control feedforward impulse.

[0010] Beneficial Effects: This invention employs a method that automatically calculates and matches the appropriate steam temperature control feedforward impulse based on the varying magnitudes of changes in biomass fuel quantity, unit load, and biomass equipment status when the amount of biomass fuel in coupled combustion changes, the unit load changes, and the operating status of the biomass system equipment. This achieves adaptive setting of the steam temperature control feedforward for biomass coupled combustion in thermal power units, improving the responsiveness of steam temperature control at all levels in biomass coupled combustion. When there are disturbances in the amount of biomass fuel or abnormalities in the biomass system equipment, the method of this invention can quickly adjust the steam temperature control feedforward impulse, reducing steam temperature fluctuations caused by disturbances in the biomass system, thereby maintaining a relatively stable steam temperature during biomass coupled combustion.

[0011] Furthermore, the value of biomass fuel quantity after conversion by the first function generator is multiplied by the value of the actual unit load after conversion by the second function generator to form the first feedforward basic quantity, including:

[0012] The value of biomass fuel quantity after conversion by the first function generator and the correction coefficient corresponding to the unit load power after conversion by the second function generator are multiplied by the first multiplier to form the first feedforward basic quantity.

[0013] Furthermore, the feedback value of the biomass weighing belt's operating status forms the second feedforward basic quantity, including:

[0014] The biomass weighing belt operation status feedback value is input to the first switching module. When the biomass weighing belt is running, the first switching module outputs 1, and when the biomass weighing belt is not running, the first switching module outputs 0. The output result of the first switching module is used as the second feedforward basic quantity.

[0015] Furthermore, the fully closed state of the biomass burner inlet pneumatic gate forms a third feedforward fundamental quantity, including:

[0016] The fully closed state of the biomass burner inlet pneumatic gate is input to the second switching module. When the biomass burner inlet pneumatic gate is fully closed, the output of the second switching module is 0. When the biomass burner inlet pneumatic gate is not fully closed, the output of the second switching module is 1. The output of the second switching module is used as the third feedforward basic quantity.

[0017] Furthermore, the first feedforward basic quantity is multiplied by the second feedforward basic quantity, and then multiplied by the third feedforward basic quantity. The result of the multiplication is passed through two inertial modules in sequence to output the temperature control feedforward impulse, including:

[0018] The output of the first switching module and the first feedforward basic quantity are both input to the second multiplier. The output of the second multiplier and the output of the second switching module are both input to the third multiplier. The output of the third multiplier passes through two inertial modules in sequence and outputs the temperature control feedforward impulse.

[0019] Furthermore, the temperature control feedforward impulse serves as the feedforward value for the biomass coupled combustion steam temperature PID regulation.

[0020] The present invention also provides a feedforward setting device for biomass coupled combustion steam temperature control, the device comprising:

[0021] The first data acquisition section is used to multiply the value of biomass fuel quantity after conversion by the first function generator with the value of actual unit load after conversion by the second function generator to form the first feedforward basic quantity;

[0022] The second data acquisition section is used to form the second feedforward basic quantity from the feedback value of the biomass weighing belt operation status;

[0023] The third data acquisition section is used to form the third feedforward basic quantity when the pneumatic gate at the inlet of the biomass burner is fully closed.

[0024] The output section is used to multiply the first feedforward basic quantity by the second feedforward basic quantity, and then by the third feedforward basic quantity. The result of the multiplication passes through two inertial modules in sequence to output the temperature control feedforward impulse.

[0025] Furthermore, the first data acquisition section is also used for:

[0026] The value of biomass fuel quantity after conversion by the first function generator and the correction coefficient corresponding to the unit load power after conversion by the second function generator are multiplied by the first multiplier to form the first feedforward basic quantity.

[0027] Furthermore, the second data acquisition section is also used for:

[0028] The biomass weighing belt operation status feedback value is input to the first switching module. When the biomass weighing belt is running, the first switching module outputs 1, and when the biomass weighing belt is not running, the first switching module outputs 0. The output result of the first switching module is used as the second feedforward basic quantity.

[0029] Furthermore, the third data acquisition section is also used for:

[0030] The fully closed state of the biomass burner inlet pneumatic gate is input to the second switching module. When the biomass burner inlet pneumatic gate is fully closed, the output of the second switching module is 0. When the biomass burner inlet pneumatic gate is not fully closed, the output of the second switching module is 1. The output of the second switching module is used as the third feedforward basic quantity.

[0031] Furthermore, the result output section is also used for:

[0032] The output of the first switching module and the first feedforward basic quantity are both input to the second multiplier. The output of the second multiplier and the output of the second switching module are both input to the third multiplier. The output of the third multiplier passes through two inertial modules in sequence and outputs the temperature control feedforward impulse.

[0033] Furthermore, the temperature control feedforward impulse serves as the feedforward value for the biomass coupled combustion steam temperature PID regulation.

[0034] The advantages of this invention are as follows: This invention employs a method that automatically calculates and matches the appropriate steam temperature control feedforward impulse based on the varying magnitudes of changes in biomass fuel quantity, unit load, and biomass equipment status when changes occur in the amount of biomass fuel used in coupled combustion, the unit load, and the operating status of the biomass system equipment. This achieves adaptive setting of the steam temperature control feedforward for biomass coupled combustion in thermal power units, improving the responsiveness of steam temperature control at all levels in biomass coupled combustion. When disturbances occur in the amount of biomass fuel or abnormal conditions occur in the biomass system equipment, the method according to this invention can quickly adjust the steam temperature control feedforward impulse, reducing steam temperature fluctuations caused by disturbances in the biomass system, thereby maintaining a relatively stable steam temperature during biomass coupled combustion. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of a biomass coupled combustion steam temperature control feedforward setting method disclosed in an embodiment of the present invention. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] Example 1

[0038] like Figure 1As shown, a biomass coupled combustion steam temperature control feedforward setting method is provided, the method comprising:

[0039] The value of biomass fuel quantity after conversion by the first function generator 1 is multiplied by the correction coefficient corresponding to the unit load power after conversion by the second function generator 2 through the first multiplier 3 to form the first feedforward basic quantity. The relationship of the first function generator 1 is generally set by industry workers based on experience in actual work. The function of the first function generator 1 is to convert the biomass fuel quantity into the corresponding result. In practical applications, it can be a linear relationship or a piecewise function. In this embodiment, the first function generator 1 is a correspondence between input and output. The input X is preset to 0, 5, 10, 15, 20, 25, 30, 35, 40, and the corresponding output Y is 0, 2, 4, 6, 8, 10, 10, 10, 10.

[0040] The formula for the second function generator 2 is generally set based on the experience of industry professionals in actual work. The function of the second function generator 2 is to convert the actual load of the unit into the corresponding correction coefficient. In practical applications, it can be a linear function or a piecewise function. In this embodiment, the second function generator 2 is a correspondence between input and output. The input X is preset to 240, 330, 400, 470, 540, 610, 660, and the corresponding output Y is 1, 1, 1, 0.9, 0.9, 0.8, 0.8.

[0041] The biomass weighing belt operation status feedback value is input to the first switching module 4. When the biomass weighing belt is running, the first switching module 4 outputs 1, and when the biomass weighing belt is not running, the first switching module 4 outputs 0. The output result of the first switching module 4 is used as the second feedforward basic quantity.

[0042] The fully closed state of the biomass burner inlet pneumatic gate is input to the second switching module 5. When the biomass burner inlet pneumatic gate is fully closed, the output of the second switching module 5 is 0; when the biomass burner inlet pneumatic gate is not fully closed, the output of the second switching module 5 is 1. The output of the second switching module 5 serves as the third feedforward basic quantity. In the figure, A represents the output setting value of the first switching module 4 and the first switching module 5.

[0043] The output of the first switching module 4 and the first feedforward basic quantity are both input to the second multiplier 6. The output of the second multiplier 6 and the output of the second switching module 5 are both input to the third multiplier 7. The output of the third multiplier 7 passes through the first inertial module 8 and the second inertial module 9 in sequence, outputting the temperature control feedforward impulse. The first inertial module 8 and the second inertial module 9 are both existing technology modules, and the working process of the first inertial module 8 and the second inertial module 9 is the same. The inertial link algorithm formula of the first inertial module 8 and the second inertial module 9 is y(k)=[T*x(k)+TS*y(k-1)] / (T+TS). T is the scan period, TS is the inertial time, y(k) is the output of the current scan period, y(k-1) is the output of the previous scan period, and x(k) is the input of the current period. In this embodiment, x(k) is the data input to the first inertial module 8 or the second inertial module 9.

[0044] The temperature control feedforward impulse serves as the feedforward value for the biomass coupled combustion steam temperature PID control. The difference between the PID control result and its feedforward value is input to the PID controller for PID adjustment.

[0045] Through the above technical solutions, this invention adopts an adaptive setting of the steam temperature control feedforward impulse based on the different ranges of biomass fuel quantity changes, unit load changes, and biomass system equipment operating status changes after changes in the amount of biomass fuel in coupled combustion, unit load changes, and biomass equipment status changes. This achieves the adaptive setting of the steam temperature control feedforward in biomass coupled combustion of thermal power units, improves the response capability of steam temperature control at all levels of the unit in biomass coupled combustion, and can quickly adjust the steam temperature control feedforward impulse according to the method of this invention when there are disturbances in the amount of biomass fuel or abnormalities in the biomass system equipment, thereby reducing steam temperature fluctuations caused by disturbances in the biomass system and keeping the unit steam temperature in a relatively stable state during biomass coupled combustion.

[0046] Example 2

[0047] Based on Embodiment 1, Embodiment 2 of the present invention also provides a biomass coupled combustion steam temperature control feedforward setting device, the device comprising:

[0048] The first data acquisition section is used to multiply the value of biomass fuel quantity after conversion by the first function generator 1 with the value of actual unit load after conversion by the second function generator 2 to form the first feedforward basic quantity;

[0049] The second data acquisition section is used to form the second feedforward basic quantity from the feedback value of the biomass weighing belt operation status;

[0050] The third data acquisition section is used to form the third feedforward basic quantity when the pneumatic gate at the inlet of the biomass burner is fully closed.

[0051] The output section is used to multiply the first feedforward basic quantity by the second feedforward basic quantity, and then by the third feedforward basic quantity. The result of the multiplication passes through two inertial modules in sequence to output the temperature control feedforward impulse.

[0052] Specifically, the first data acquisition section is also used for:

[0053] The value of biomass fuel quantity after conversion by the first function generator 1 is multiplied by the correction coefficient corresponding to the unit load power after conversion by the second function generator 2 through the first multiplier 3 to form the first feedforward basic quantity.

[0054] Specifically, the second data acquisition section is also used for:

[0055] The biomass weighing belt operation status feedback value is input to the first switching module 4. When the biomass weighing belt is running, the first switching module 4 outputs 1, and when the biomass weighing belt is not running, the first switching module 4 outputs 0. The output result of the first switching module 4 is used as the second feedforward basic quantity.

[0056] More specifically, the third data acquisition section is also used for:

[0057] The fully closed state of the biomass burner inlet pneumatic gate is input to the second switching module 5. When the biomass burner inlet pneumatic gate is fully closed, the output of the second switching module 5 is 0. When the biomass burner inlet pneumatic gate is not fully closed, the output of the second switching module 5 is 1. The output of the second switching module 5 is used as the third feedforward basic quantity.

[0058] More specifically, the result output section is also used for:

[0059] The output of the first switching module 4 and the first feedforward basic quantity are both input to the second multiplier 6. The output of the second multiplier 6 and the output of the second switching module 5 are both input to the third multiplier 7. The output of the third multiplier 7 passes through two inertial modules in sequence and outputs the temperature control feedforward impulse.

[0060] Specifically, the temperature control feedforward impulse serves as the feedforward value for the biomass coupled combustion steam temperature PID regulation.

[0061] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for feedforward setting of biomass coupled combustion steam temperature control, characterized in that, The method includes: The value of biomass fuel quantity after conversion by the first function generator and the correction coefficient corresponding to the unit load power after conversion by the second function generator are multiplied by the first multiplier to form the first feedforward basic quantity; The biomass weighing belt operation status feedback value is input to the first switching module. When the biomass weighing belt is running, the first switching module outputs 1, and when the biomass weighing belt is not running, the first switching module outputs 0. The output result of the first switching module is used as the second feedforward basic quantity. The state of whether the pneumatic gate at the biomass burner inlet is fully closed is input to the second switching module. When the pneumatic gate at the biomass burner inlet is fully closed, the output of the second switching module is 0. When the pneumatic gate at the biomass burner inlet is not fully closed, the output of the second switching module is 1. The output of the second switching module is used as the third feedforward basic quantity. The output of the first switching module and the first feedforward basic quantity are both input to the second multiplier. The output of the second multiplier and the output of the second switching module are both input to the third multiplier. The output of the third multiplier passes through two inertial modules in sequence and outputs the steam temperature control feedforward impulse.

2. The biomass coupled combustion steam temperature control feedforward setting method according to claim 1, characterized in that, The steam temperature control feedforward impulse serves as the feedforward value for the biomass coupled combustion steam temperature PID regulation.

3. A feedforward setting device for biomass coupled combustion steam temperature control, characterized in that, The device includes: In the first data acquisition section, the value of biomass fuel quantity after conversion by the first function generator and the correction coefficient corresponding to the unit load power after conversion by the second function generator of the actual unit load are multiplied by the first multiplier to form the first feedforward basic quantity. The second data acquisition section is used to input the biomass weighing belt operation status feedback value to the first switching module. When the biomass weighing belt is running, the first switching module outputs 1, and when the biomass weighing belt is not running, the first switching module outputs 0. The output result of the first switching module is used as the second feedforward basic quantity. The third data acquisition section is used to input the state of whether the biomass burner inlet pneumatic gate is fully closed to the second switching module. When the biomass burner inlet pneumatic gate is fully closed, the output of the second switching module is 0. When the biomass burner inlet pneumatic gate is not fully closed, the output of the second switching module is 1. The output result of the second switching module is used as the third feedforward basic quantity. In the output section, the output of the first switching module and the first feedforward basic quantity are both input to the second multiplier. The output of the second multiplier and the output of the second switching module are both input to the third multiplier. The output of the third multiplier passes through two inertial modules in sequence and outputs the steam temperature control feedforward impulse.

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