Load regulating control method and device based on coal powder circulating fluidized bed synergistic combustion

Abstract

The present application relates to circulating fluidized bed boiler technical field, specifically provide based on the load regulation control method and device of coal powder circulating fluidized bed collaborative combustion, the method includes steps, in response to the load regulation instruction of target power grid, according to preset load threshold and load regulation instruction are judged, the target working state of target boiler is determined;Load regulation instruction includes load variation and load change rate;Target boiler includes circulating fluidized bed boiler and coal powder burner;In the case where the target working state is the first state, according to load variation and load change rate, the output of circulating fluidized bed boiler and the output of coal powder burner are adjusted and controlled;In the case where the target working state is the second state, the output of coal powder burner is controlled to be preset steady-state output, and the output of circulating fluidized bed boiler is adjusted and controlled according to load variation.The present application can effectively improve the overall load change rate.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of circulating fluidized bed boilers, in particular to a load regulation control method and device based on coal powder circulating fluidized bed collaborative combustion. BACKGROUND

[0002] In recent years, with the rapid development of new energy industry, renewable energy such as wind energy and photovoltaic has been connected to the power grid to realize power output. However, due to the intermittency of new energy output, the demand for rapid load adjustment of traditional power sources by the power grid is increasing. The circulating fluidized bed boiler is a high-efficiency and low-pollution coal-fired equipment, which realizes full combustion of fuel and pollution control through circulating fluidization technology, and is widely used in power generation, industrial heating and other fields. However, when the circulating fluidized bed boiler is used in combination with new energy power sources, the load regulation of the circulating fluidized bed boiler has a lag and cannot quickly respond to the load change requirements of the power grid. SUMMARY

[0003] The load regulation control method and device based on coal powder circulating fluidized bed collaborative combustion provided by the embodiments of the present application at least solve the problem of load regulation lag of conventional circulating fluidized bed boilers, can effectively improve the overall load change rate, and realize rapid response to the load change requirements of the power grid.

[0004] In a first aspect, the present application provides a load regulation control method based on coal powder circulating fluidized bed collaborative combustion, comprising the steps of: in response to a load regulation instruction of a target power grid, judging according to a preset load threshold and the load regulation instruction to determine a target working state of a target boiler; wherein the load regulation instruction includes a load change amount and a load change rate; the target boiler includes a circulating fluidized bed boiler and a coal powder burner arranged on the circulating fluidized bed boiler; in the case that the target working state is a first state, adjusting and controlling the output of the circulating fluidized bed boiler and the output of the coal powder burner according to the load change amount and the load change rate; in the case that the target working state is a second state, controlling the output of the coal powder burner to be a preset steady-state output, and adjusting and controlling the output of the circulating fluidized bed boiler according to the load change amount.

[0005] In one embodiment of the present application, the first state comprises a first load increasing sub-state; in the case that the target working state is the first load increasing sub-state, the output of the circulating fluidized bed boiler is adjusted and controlled according to the load variation and the load variation rate, including the steps of: calculating a target coal powder increasing amount according to the unit load coal amount and the load variation; adjusting and controlling the coal powder supply amount of the circulating fluidized bed boiler according to the target coal powder increasing amount, so as to adjust the output of the circulating fluidized bed boiler; in the case that the target working state is the first load increasing sub-state, the output of the coal powder burner is adjusted and controlled according to the load variation and the load variation rate, including the steps of: calculating a first target step amount according to the load variation, the load variation rate and the rated output of the coal powder burner; calculating a maximum increasing margin according to the preset steady state output and the rated output of the coal powder burner; adjusting and controlling the coal powder supply amount of the coal powder burner according to the minimum value of the first target step amount and the maximum increasing margin, so as to adjust the output of the coal powder burner.

[0006] In one embodiment of the present application, the first target step amount is calculated according to the load variation, the load variation rate and the rated output of the coal powder burner, and is expressed as: , wherein, is the first target step amount, is the load variation, is the load variation rate, is the rated output of the coal powder burner; the maximum increasing margin is calculated according to the preset steady state output and the rated output of the coal powder burner, and is expressed as: , wherein, is the maximum increasing margin, is the preset steady state output of the coal powder burner.

[0007] In one embodiment of the present application, the first state comprises a first load reduction sub-state; in the case that the target working state is the first load reduction sub-state, the output of the circulating fluidized bed boiler is adjusted and controlled according to the load variation and the load variation rate, including the steps of: calculating a target coal powder reduction amount according to the unit load coal amount and the load variation; adjusting and controlling the coal powder supply amount of the circulating fluidized bed boiler according to the target coal powder reduction amount, so as to adjust the output of the circulating fluidized bed boiler; in the case that the target working state is the first load reduction sub-state, the output of the coal powder burner is adjusted and controlled according to the load variation and the load variation rate, including the steps of: calculating a second target step amount according to the load variation, the load variation rate and the rated output of the coal powder burner; adjusting and controlling the coal powder supply amount of the coal powder burner according to the minimum value of the preset steady-state output of the coal powder burner and the second target step amount, so as to adjust the output of the coal powder burner.

[0008] In one embodiment of the present application, the second target step amount is calculated according to the load variation , the load variation rate and the rated output of the coal powder burner , and is expressed as: , wherein, is the second target step amount.

[0009] In one embodiment of the present application, after the output of the circulating fluidized bed boiler and the output of the coal powder burner are adjusted and controlled according to the load variation and the load variation rate, the step of adjusting and controlling the output of the coal powder burner according to a preset coal powder adjustment rate is further included in the case that the bed temperature variation rate of the target boiler is greater than a preset load increase bed temperature rate threshold or less than a preset load reduction bed temperature rate threshold.

[0010] In one embodiment of the present application, in the case that the target working state is a second state, the output of the circulating fluidized bed boiler is adjusted and controlled according to the load variation, including the steps of: calculating a target coal powder adjustment amount according to the unit load coal amount and the load variation; adjusting and controlling the coal powder supply amount of the circulating fluidized bed boiler according to the target coal powder adjustment amount, so as to adjust the output of the circulating fluidized bed boiler.

[0011] In one embodiment of the present application, the step of adjusting and controlling the output of the coal powder burner to a preset steady-state output in response to the load of the target power grid being a target load is further included; wherein the rated output of the coal powder burner and the preset steady-state output satisfy the relationship, .

[0012] In one embodiment of the present application, the preset load threshold includes a preset load amplitude threshold and a preset load rate threshold; in response to a load adjustment instruction of a target power grid, the target working state of the target boiler is determined according to the preset load threshold and the load adjustment instruction, including the steps of: calculating according to the load change amount to obtain a target load change amplitude of the target boiler; calculating according to the load change rate to obtain a target load rate of the target boiler; in the case that the absolute value of the target load change amplitude is greater than the absolute value of the preset load amplitude threshold, and the absolute value of the target load rate is greater than the preset load rate threshold, the target working state is determined as the first state; in the case that the absolute value of the target load change amplitude is not greater than the absolute value of the preset load amplitude threshold, or the absolute value of the target load rate is not greater than the preset load rate threshold, the target working state is determined as the second state.

[0013] In a second aspect, the present application further provides a load adjustment control device based on coal powder circulating fluidized bed collaborative combustion, applied to the load adjustment control method based on coal powder circulating fluidized bed collaborative combustion as described in any one of the above, including a target boiler, including a circulating fluidized bed boiler, and a coal powder burner arranged on the circulating fluidized bed boiler; and a controller for determining the target working state of the target boiler in response to a load adjustment instruction of a target power grid, according to a preset load threshold and the load adjustment instruction; in the case that the target working state is the first state, the output of the circulating fluidized bed boiler and the output of the coal powder burner are adjusted and controlled according to the load change amount and the load change rate; in the case that the target working state is the second state, the output of the coal powder burner is controlled to be a preset steady-state output, and the output of the circulating fluidized bed boiler is adjusted and controlled according to the load change amount; wherein the load adjustment instruction includes a load change amount and a load change rate.

[0014] The above technical solutions of the present application have the following beneficial effects compared with the prior art:

[0015] The load regulation control method and device based on the coal powder circulating fluidized bed collaborative combustion provided by the application set a coal powder burner on the circulating fluidized bed boiler, and the coal powder of the coal powder burner and the circulating fluidized bed is dynamically adjusted, so that the load change rate of the target boiler is significantly improved, the load is quickly responded, and the demand of the power grid for fast peak shaving is met. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the application, and for those skilled in the art, other embodiments can be obtained from these drawings without creative labor. In the drawings:

[0017] Figure 1 is a flowchart of the load regulation control method based on the coal powder circulating fluidized bed collaborative combustion in the preferred embodiment of the application.

[0018] Figure 2 is a structural schematic diagram of the target boiler in the preferred embodiment of the application.

[0019] Figure 3 is a structural schematic diagram of the load regulation control device based on the coal powder circulating fluidized bed collaborative combustion in the preferred embodiment of the application.

[0020] Figure 4 is a structural schematic diagram of the electronic device in the preferred embodiment of the application.

[0021] Among the above drawings, the following reference signs are included:

[0022] 10, circulating fluidized bed boiler; 11, upper secondary air port; 12, lower secondary air port; 13, dilute phase zone; 14, dense phase zone; 15, separator; 151, flue gas outlet; 16, return feeder; 20, coal powder burner; 30, controller; 401, calculation unit; 402, ROM; 403, RAM; 404, bus; 405, I / O interface; 406, input unit; 407, output unit; 408, storage unit; 409, communication unit. DETAILED DESCRIPTION

[0023] Embodiments of the present application will be described in more detail below with reference to the drawings. While several embodiments of the application are shown in the drawings, it is understood that the application can be embodied in various forms and should not be interpreted in limitation to the embodiments set forth herein, but rather by way of example. It is to be understood that the drawings and embodiments are only for illustrative purposes and are not intended to limit the scope of protection of the present application.

[0024] It should be noted that, with the development of the new energy industry, renewable energy such as wind power and photovoltaic power is connected to the power grid in large quantities to realize power output. However, the power output is intermittent due to the influence of natural conditions such as wind changes and day-night light differences, which will cause frequent fluctuations in power grid load. In order to avoid the balance between supply and demand of the power grid, the demand of the power grid for traditional power sources to quickly adjust the load is increasing. Specifically, taking wind power as an example, when wind power suddenly increases, the traditional power source is required to quickly reduce the load; conversely, when wind power decreases, the traditional power source is required to quickly increase the load.

[0025] Circulating Fluidized Bed (CFB) boiler is a kind of high-efficiency and low-pollution coal-fired equipment, which can realize full combustion of fuel and pollution control, and is widely used in power generation, industrial heating and other fields.

[0026] The circulating fluidized bed boiler is mainly based on the fluidized combustion technology and the circulating combustion mechanism, and realizes the full combustion of fuel and the control of pollutants through the efficient mixing and circulation of gas-solid two-phase flow. Specifically, in actual use, the primary air is sent from the air distribution plate at the bottom of the furnace to lift the fuel and the bed material to form a fluidized bed, that is, a dense phase zone, so that the fuel particles are violently stirred to realize enhanced heat transfer and combustion. The flue gas generated by combustion carries unburned particles, ash and other substances upward into the upper part of the furnace, that is, the dilute phase zone, and enters the separator. After separation by the separator, the flue gas is discharged from the flue gas outlet of the separator, and the separated particles are returned to the furnace by the return feeder for circulating combustion.

[0027] Although the circulating fluidized bed boiler has the advantages of more bed material, stable combustion, strong heat storage and long combustion time, it also has the problems of large hysteresis and slow heat release. Therefore, when the circulating fluidized bed boiler is used in combination with new energy power sources to generate power, the load regulation of the circulating fluidized bed boiler has hysteresis and cannot quickly respond to the load change requirements of the power grid.

[0028] In order to solve the above problems, with reference to Figure 1 and Figure 2 , the present application provides a load regulation control method based on coal powder circulating fluidized bed collaborative combustion, comprising the steps of:

[0029] In response to the load adjustment instruction of the target power grid, a preset load threshold and the load adjustment instruction are judged to determine a target working state of the target boiler.

[0030] The load adjustment instruction includes a load change amount and a load change rate. The target boiler includes a circulating fluidized bed boiler 10 and a pulverized coal burner 20 arranged on the circulating fluidized bed boiler 10.

[0031] When the target working state is the first state, the output of the circulating fluidized bed boiler 10 and the output of the pulverized coal burner 20 are adjusted and controlled according to the load change amount and the load change rate.

[0032] When the target working state is the second state, the output of the pulverized coal burner 20 is controlled to be a preset steady-state output, and the output of the circulating fluidized bed boiler 10 is adjusted and controlled according to the load change amount.

[0033] The target power grid, i.e., the power grid cooperating with the target boiler in the embodiment, has the ability to issue a load adjustment instruction to the corresponding power plant according to the actual load demand. For example, the target power grid can issue the load adjustment instruction through an energy management system (EMS), and the load adjustment instruction is transmitted to the power plant in the form of an electrical signal. The load adjustment instruction includes a load change amount and a load change rate that the power plant needs to meet.

[0034] The conventional power plant needs to spend a long time to achieve load regulation and meet the demand after receiving the instruction. In the embodiment, in order to achieve fast response, a preset load threshold is set in advance, so that after receiving the load adjustment instruction of the target power grid, the load adjustment instruction can be analyzed, and the preset load threshold and the analyzed load adjustment instruction are judged to quickly determine the target working state of the target boiler.

[0035] In the embodiment, the target boiler, i.e., the device that needs to output to achieve load adjustment, includes a circulating fluidized bed boiler 10 and a pulverized coal burner 20 arranged on the circulating fluidized bed boiler 10. The circulating fluidized bed boiler 10 and the pulverized coal burner 20 both belong to the prior art.

[0036] Referring to Figure 2 As shown in the figure, the circulating fluidized bed boiler 10 mainly includes a hearth, a secondary air assembly, and a gas-solid separation assembly.

[0037] The hearth includes a communicating dense phase zone 14 and a dilute phase zone 13. The dense phase zone 14 is arranged at the bottom of the hearth and is an initial combustion zone of fuel, usually burning 0 to 10 mm of coal. The bed material of the dense phase zone 14 is intensively fluidized under the action of high-speed primary air to form a high-concentration particle layer. The dilute phase zone 13 is arranged above the dense phase zone 14 and extends to the top of the hearth.

[0038] The secondary air assembly includes a lower secondary air port 12 and an upper secondary air port 11, the upper secondary air port 11 is arranged at the junction of the dense phase zone 14 and the dilute phase zone 13, and the lower secondary air port 12 is arranged below the upper secondary air port 11. The combustion-supporting is realized through the two air ports.

[0039] The gas-solid separation assembly includes a separator 15 and a return feeder 16. The separator 15 is arranged at the top of the furnace and includes a flue gas outlet 151. The separator 15 is used to separate the gas and the solid after receiving the particles of the dilute phase zone 13, the separated gas is discharged from the flue gas outlet 151, and the solid enters the return feeder 16 which is in communication with the separator 15 and the dense phase zone 14 respectively, and then returns to the furnace to realize the circulation.

[0040] Different from the conventional boiler, the target boiler is provided with a pulverized coal burner 20 to realize the rapid regulation of the load through the synergistic combustion of the pulverized coal burner 20 and the circulating fluidized bed boiler 10. The person skilled in the art can arrange the installation position of the pulverized coal burner 20 on the circulating fluidized bed boiler 10 according to the actual needs, so that the pulverized coal burner 20 is in communication with the dense phase zone 14 of the circulating fluidized bed boiler 10. Preferably, the pulverized coal burner 20 is arranged between the upper secondary air port 11 and the lower secondary air port 12 of the circulating fluidized bed boiler 10. Exemplarily, the pulverized coal used by the pulverized coal burner 20 can be provided by a central storage type pulverizing system, or external pulverized coal can be used.

[0041] The circulating fluidized bed boiler 10 is a primary regulating means of the output of the target boiler, and the pulverized coal burner 20 is a secondary regulating means of the output of the target boiler. The two can be combined to effectively improve the load regulation ability of the target boiler.

[0042] When the pulverized coal burner 20 is working, the rated output of the pulverized coal burner 20 can be preferably set to 10% of the rated output of the circulating fluidized bed boiler 10. The pulverized coal burner 20 is different from the circulating fluidized bed boiler 10 in that the particle size of the pulverized coal used for combustion is relatively small, the combustion reaction is fast, the combustion time is short, the hysteresis is small, and the heat release is fast. The pulverized coal is injected into the circulating fluidized bed boiler 10 from the pulverized coal burner 20, and rapidly releases heat under the action of high-temperature bed material and flue gas, which provides a stable heat source for the combustion of the pulverized coal. At the same time, the pulverized coal also heats the bed material and flue gas of the boiler. By taking advantage of the small hysteresis and fast combustion and heat release characteristics of the pulverized coal combustion, the overall combustion and heat release rate of the target boiler can be improved, thereby improving the load change rate.

[0043] Subsequently, after the target working state of the target boiler is determined, the circulating fluidized bed boiler 10 and the pulverized coal burner 20 can be adjusted and controlled according to different states to make their outputs and rapidly realize the regulation of the load to meet the demand of the target power grid.

[0044] The target working state includes a first state and a second state. The first state requires a large and fast load adjustment, while the second state is different from the first state and requires a small and slow load adjustment. Whether the load adjustment requires a large or small adjustment and whether it requires a fast or slow adjustment can be determined according to a preset load threshold and a load adjustment instruction. The adjustment and control modes of the circulating fluidized bed boiler 10 and the pulverized coal burner 20 are different for different target working states.

[0045] When the target working state is determined to be the first state, the output of the circulating fluidized bed boiler 10 and the output of the pulverized coal burner 20 are adjusted and controlled according to the load change amount and the load change rate. The output of the pulverized coal burner 20 is controlled by the pulverized coal step amount, which is divided into a pulverized coal step increase amount and a pulverized coal step decrease amount according to the different load increases and load decreases. Both are adjusted and controlled according to the load change amount and the load change rate.

[0046] The output of the circulating fluidized bed boiler 10 refers to its heat production capacity or steam production capacity per unit time, and essentially represents the energy conversion efficiency and production capacity of the circulating fluidized bed boiler 10 under design conditions, which is related to factors such as fuel properties and air-coal ratio. The output of the pulverized coal burner 20 refers to its fuel combustion capacity and corresponding heat release capacity per unit time, and essentially represents the efficiency of the pulverized coal burner 20 in stably burning and releasing heat after mixing coal powder with air in the furnace, which is related to factors such as fuel properties and burner structure.

[0047] When the target working state is determined to be the second state, the pulverized coal burner 20 maintains a preset steady-state output, and only the output of the circulating fluidized bed boiler 10 is adjusted and controlled according to the load change amount.

[0048] The circulating fluidized bed boiler 10 is a primary adjustment means for the target boiler output, and needs to be adjusted in both the first state and the second state. The pulverized coal burner 20 is a secondary adjustment means for the target boiler output, and is an auxiliary component for achieving fast load variation of the circulating fluidized bed boiler 10, and only participates in adjustment in the first state, i.e., when the target boiler needs to vary the load quickly. During the load variation process of the target boiler, the output of the pulverized coal burner 20 is dynamically increased or decreased, so that the circulating fluidized bed boiler 10 can vary the load quickly, to balance the fast response of the target boiler load and ensure the stability of the combustion.

[0049] Especially in the case where the target boiler is running at a low load and receiving a load adjustment instruction, the pulverized coal burner 20 can make the corresponding coal powder burn and release heat quickly in the dense phase zone 14 of the circulating fluidized bed boiler 10, increase the bed temperature of the dense phase zone 14, and improve the stable combustion capacity and combustion efficiency of the target boiler at a low load.

[0050] The load regulation control method based on the coal powder circulating fluidized bed collaborative combustion of the application, the coal powder burner 20 is arranged on the circulating fluidized bed boiler 10, the coal powder of the coal powder burner 20 and the circulating fluidized bed is dynamically adjusted, the load change rate of the target boiler is significantly improved, the rapid response of the load is realized, and the demand of the power grid rapid peak shaving is met.Working, the two collaborative combustion cooperation ensures the combustion stability of the target boiler in the process of rapid load change, has high low load stable combustion capacity and combustion efficiency.In addition, since the adjustment is dynamic, under the condition of ensuring that the load demand can be met, the coal powder consumption and operating cost are effectively reduced.

[0051] In some embodiments of the load regulation control method based on the coal powder circulating fluidized bed collaborative combustion of the application, the preset load threshold includes a preset load amplitude threshold and a preset load rate threshold.

[0052] The person skilled in the art can set the specific preset load amplitude threshold and preset load rate threshold according to the actual demand, for example, the preset load amplitude threshold is set to 5% of the rated load of the circulating fluidized bed boiler 10, i.e. 0.05 ; the preset load rate threshold is set to 0.02 .

[0053] It should be noted that the rated load is different from the rated output, the rated load is the basis of the rated output, and determines the maximum energy input available to the circulating fluidized bed boiler 10; the rated output is the final output after conversion.

[0054] In response to the load regulation instruction of the target power grid, the preset load threshold and the load regulation instruction are judged to determine the target working state of the target boiler, including the steps of:

[0055] On the one hand, according to the load change amount , the target load change amplitude of the target boiler is obtained by calculation.

[0056] Wherein, the load change amount refers to the absolute value of the numerical change of the load in unit time, which reflects the specific quantity of load increase or decrease, which can be positive or negative.The load change amplitude is the proportion of the load change amount to the initial load, which reflects the degree of change or relative size of the load.

[0057] On the other hand, according to the load change rate , the target load rate of the target boiler is obtained by calculation.

[0058] Wherein, the load rate is the absolute change amount of the load in unit time, and the load change rate is the proportion of the load change amount to the initial load in unit time.

[0059] Subsequently, if the absolute value of the target load change amplitude is greater than the absolute value of the preset load amplitude threshold, and the absolute value of the target load rate is greater than the preset load rate threshold, the target operating state is determined to be the first state. If the absolute value of the target load change amplitude is not greater than the absolute value of the preset load amplitude threshold, or the absolute value of the target load rate is not greater than the preset load rate threshold, the target operating state is determined to be the second state.

[0060] It is worth noting that there are two situations during load adjustment: load increase and load decrease, and attention should be paid to the positive and negative signs of the corresponding parameters.

[0061] Taking load increase as an example, if the target load change is less than or equal to 0.05 , or the target load rate is less than or equal to 0.02 , at this time, it can be determined that the load is increasing slowly with a small amplitude, and the target working state is the second state. On the contrary, if the target load change amplitude is greater than 0.05 And the target load rate is greater than 0.02 , it can be determined that the load is increased significantly and rapidly, and the target working state is the first state. Load reduction is similar and will not be described in detail.

[0062] In some embodiments of the load regulation control method for pulverized coal circulating fluidized bed co-combustion according to the present invention, the first state includes a first load increase sub-state and a first load decrease sub-state. Different methods are required to implement regulation control for the two different first states.

[0063] Specifically, when the target operating state is the first load increase sub-state, only adjusting the output of the circulating fluidized bed boiler 10 cannot meet the rapid response requirements and achieve load increase. The circulating fluidized bed boiler 10 and the pulverized coal burner 20 need to be adjusted and controlled at the same time.

[0064] Therefore, on the one hand, the output of the circulating fluidized bed boiler 10 is adjusted and controlled according to the load variation and the load variation rate; on the other hand, the output of the pulverized coal burner 20 is adjusted and controlled according to the load variation and the load variation rate.

[0065] The output of the circulating fluidized bed boiler 10 is regulated and controlled according to the load change amount and the load change rate, including the following steps:

[0066] First, calculate the target pulverized coal increase based on the unit load coal quantity and load change. It can be expressed as:

[0067] .

[0068] Where, target coal powder increase, i.e. the coal powder amount that the circulating fluidized bed boiler 10 needs to increase; load change amount; unit load coal amount, which is an empirical value and can be set according to actual needs by those skilled in the art.

[0069] Then, the coal powder supply amount of the circulating fluidized bed boiler 10 is adjusted and controlled according to the target coal powder increase, so as to adjust the output of the circulating fluidized bed boiler 10. How to adjust the coal powder supply amount according to the target coal powder increase is known in the art and will not be described here.

[0070] The output of the coal powder burner 20 is adjusted and controlled according to the load change amount and the load change rate, including the steps of:

[0071] First, the first target step amount is calculated according to the load change amount, the load change rate and the rated output of the coal powder burner 20. It is expressed as:

[0072] .

[0073] In the formula, the first target step amount is the required coal powder step amount calculated considering the load change amplitude and the load change rate. the load change amount, the load change rate, and the rated output of the coal powder burner 20.

[0074] Secondly, the maximum increase margin is calculated according to the preset steady-state output and the rated output of the coal powder burner 20. It is expressed as:

[0075] .

[0076] In the formula, the maximum increase margin is the maximum increase margin reserved by the coal powder burner 20. the preset steady-state output of the coal powder burner 20.

[0077] Finally, the coal powder supply amount of the coal powder burner 20 is adjusted and controlled according to the minimum value of the first target step amount and the maximum increase margin, so as to adjust the output of the coal powder burner 20.

[0078] In the embodiment of the present application, if the first target step amount is less than the maximum increase margin , it means that the step amount of the coal powder output stage is less than the maximum increase margin , and at this time the step can be performed according to the first target step amount . Conversely, if the maximum increase margin Less than the first target step amount Then, the maximum increase amount The step is performed.

[0079] Through this step, the coal burner 20 and the circulating fluidized bed boiler 10 can achieve good collaborative combustion, rapidly and stably achieve a large increase in load, and significantly improve the load change rate of the target boiler, meeting the demand for rapid peak shaving of the power grid.

[0080] In the case where the target working state is the first load reduction sub-state, only adjusting the output of the circulating fluidized bed boiler 10 cannot meet the demand for rapid response and achieve load reduction, and the circulating fluidized bed boiler 10 and the coal burner 20 need to be adjusted and controlled at the same time.

[0081] Therefore, in one aspect, the output of the circulating fluidized bed boiler 10 is adjusted and controlled according to the load change amount and the load change rate; in another aspect, the output of the coal burner 20 is adjusted and controlled according to the load change amount and the load change rate.

[0082] The output of the circulating fluidized bed boiler 10 is adjusted and controlled according to the load change amount and the load change rate, including the steps of:

[0083] First, the target coal reduction amount is calculated according to the unit load coal amount and the load change amount. It is represented as:

[0084] .

[0085] In the formula, The target coal reduction amount is the amount of coal that the circulating fluidized bed boiler 10 needs to reduce.

[0086] Then, the coal supply amount of the circulating fluidized bed boiler 10 is adjusted and controlled according to the target coal reduction amount to adjust the output of the circulating fluidized bed boiler 10. How to adjust the coal supply amount according to the target coal reduction amount is a matter of existing technology and will not be described in detail.

[0087] The output of the coal burner 20 is adjusted and controlled according to the load change amount and the load change rate, including the steps of:

[0088] First, the second target step amount is calculated according to the load change amount, the load change rate, and the rated output of the coal burner 20. It is represented as:

[0089] .

[0090] In the formula, The second target step amount is the required coal step amount calculated considering the load change amplitude and the load change rate.

[0091] Then, the coal powder supply amount of the coal powder burner 20 is controlled according to the minimum value of the preset steady-state output of the coal powder burner 20 and the second target jump amount, so as to adjust the output of the coal powder burner 20. When the load is reduced, the preset steady-state output of the coal powder burner 20 is the maximum reduction amount retained by the coal powder burner 20.

[0092] Through the step, the coal powder burner 20 and the circulating fluidized bed boiler 10 can be well realized to realize the coordinated combustion, the rapid and stable realization of the large reduction load, and the load change rate of the target boiler can be significantly improved, and the demand of the power grid for rapid peak shaving can be met.

[0093] The load adjustment control method based on the coal powder circulating fluidized bed coordinated combustion, in some embodiments, after the output of the circulating fluidized bed boiler 10 and the output of the coal powder burner 20 are adjusted and controlled according to the load change amount and the load change rate, the method further comprises the step of:

[0094] In the case that the bed temperature change rate of the target boiler is greater than the preset load increase bed temperature rate threshold or less than the preset load reduction bed temperature rate threshold, the output of the coal powder burner 20 is adjusted and controlled according to the preset coal powder adjustment rate. Preferably, the output of the coal powder burner 20 is adjusted by adjusting the coal powder supply amount of the coal powder burner 20.

[0095] The preset load increase bed temperature rate threshold and the preset load reduction bed temperature rate threshold are empirical values, and those skilled in the art can set them according to actual needs. In the process of large, rapid load increase or load reduction, the bed temperature of the circulating fluidized bed boiler 10 will change, and too high or too low bed temperature will cause unsafe and stable operation.

[0096] Specifically, when the load is increased and the output of the target boiler is increased, the bed temperature will increase. If the load increase rate is too fast, coking is easy to occur. On this basis, the preset load increase bed temperature rate threshold can be set to 2.5℃ / min, and if the bed temperature change rate is greater than 2.5℃ / min, the output of the coal powder burner 20 needs to be adjusted and controlled.

[0097] For example, the output of the coal powder burner 20 can be reduced by 20% of the rated output of the coal powder burner 20 per minute until it is reduced to the preset steady-state output, so that the coal powder burner 20 is in an adjusted standby state. Then, only the coal powder supply amount of the circulating fluidized bed boiler 10 is adjusted to adjust the output of the circulating fluidized bed boiler 10, so as to ensure the stability and accuracy of the load change.

[0098] When the load is reduced and the output of the target boiler is reduced, the bed temperature will decrease. At this time, the preset load reduction bed temperature rate threshold can be set to -2.5℃ / min, and the minus sign indicates that the bed temperature decreases. In order to avoid the bed temperature being too low to affect the stable operation of the boiler, the output of the pulverized coal burner 20 needs to be adjusted and controlled.

[0099] For example, the output of the pulverized coal burner 20 can be increased by 20% of the rated output of the pulverized coal burner 20 per minute until it increases to the preset steady-state output, so as to maintain the bed temperature in a safe range. Then, only by adjusting the pulverized coal supply amount of the circulating fluidized bed boiler 10, the output of the circulating fluidized bed boiler 10 is adjusted, and the stability and accuracy of the load change are ensured.

[0100] By detecting the bed temperature change rate of the target boiler and adjusting the output of the pulverized coal burner 20 according to the actual bed temperature change rate, the bed temperature can be maintained in a safe range to ensure that the target boiler can operate safely and stably.

[0101] The load adjustment and control method based on the pulverized coal circulating fluidized bed collaborative combustion according to the present application, in some embodiments, the second state includes a second load increasing sub-state and a second load reducing sub-state. Different adjustment and control methods are needed for the two different second states.

[0102] When the target working state is the second state, a simple adjustment method is needed, that is, the output of the pulverized coal burner 20 is maintained at the preset steady-state output, and only the output of the circulating fluidized bed boiler 10 is adjusted and controlled according to the load change amount. The adjustment and control of the output of the circulating fluidized bed boiler 10 according to the load change amount includes the following steps:

[0103] First, the target pulverized coal adjustment amount is calculated according to the unit load coal amount and the load change amount.

[0104] Then, the pulverized coal supply amount of the circulating fluidized bed boiler 10 is adjusted and controlled according to the target pulverized coal adjustment amount to adjust the output of the circulating fluidized bed boiler 10.

[0105] When the target working state is the second load increasing sub-state, the target pulverized coal adjustment amount is the amount of pulverized coal that needs to be increased by the circulating fluidized bed boiler 10. When the target working state is the second load reducing sub-state, the target pulverized coal adjustment amount is the amount of pulverized coal that needs to be reduced by the circulating fluidized bed boiler 10. By calculating the unit load coal amount and the load change amount, the accurate supply of pulverized coal and the stable operation of the target boiler can be ensured.

[0106] Preferably, in the case of small amplitude, slow load or load, the operation parameters of the target boiler are monitored. The operation parameters include bed temperature, bed pressure, steam parameters, etc., to ensure that the target boiler is always in a safe and stable operation state.

[0107] The load regulation control method based on the coal powder circulating fluidized bed collaborative combustion according to the present application, in some embodiments, further comprises the steps of:

[0108] In response to the load of the target power grid being a target load, the output of the coal powder burner 20 is controlled to be a preset steady-state output.

[0109] In the case where the load of the target power grid has met the demand, the coal powder burner 20 still needs to maintain the output in order to respond to sudden changes in working conditions at any time. In the case where the working conditions change and the target boiler needs to be adjusted to a target working state, the coal powder burner 20 maintaining the preset steady-state output can also quickly increase or decrease the output according to the actual demand to meet the rapid response demand.

[0110] Wherein, the rated output of the coal powder burner 20 and the preset steady-state output satisfy the relationship, .

[0111] Wherein, the preset steady-state output is not too small, if too small, less than , at this time, the space for reducing the output of the coal powder burner 20 is too small, which reduces the ability to quickly reduce the load. The preset steady-state output is not too large, if too large, greater than , at this time, the space for increasing the output of the coal powder burner 20 is too small, which reduces the ability to quickly increase the load. And the preset steady-state output is to , which can well collaborate with the circulating fluidized bed boiler 10 to provide stable combustion heat for the target boiler and ensure the stable operation of the target boiler. Preferably, is set to , so as to take into account the rapid load ability and the small amount of coal powder, thereby reducing the operating cost. Wherein, in the case where the rated output of the coal powder burner 20 is set to 10% of the rated output of the circulating fluidized bed boiler 10, the preset steady-state output is preferably set to 5% of the rated output of the circulating fluidized bed boiler 10.

[0112] The load regulation control method based on the coal powder circulating fluidized bed collaborative combustion according to the present application, in some embodiments, needs to establish a safety protection mechanism to ensure the safety and reliability of the target boiler. Specifically, it comprises the steps of:

[0113] The bed temperature of the circulating fluidized bed boiler 10 is detected, and when the bed temperature is greater than a first preset threshold and less than a second preset threshold, the pulverized coal supply is cut off. Preferably, the first preset threshold is set to 950°C and the second preset threshold is set to 600°C.

[0114] In some embodiments of the load regulation control method based on pulverized coal circulating fluidized bed co-combustion of the present invention, the pulverized coal of the pulverized coal burner 20 should be screened before supplying the coal. Specifically, the method includes the following steps:

[0115] The pulverized coal of the pulverized coal burner 20 is screened until it meets the preset fineness requirement.

[0116] Among them, the preset fineness requirement is set to R90 < 20%. R90 refers to the mass percentage of the coarse coal powder remaining on the screen, that is, the coal powder that has not passed the screening, in the total coal powder when the coal powder is screened using a sieve with a mesh width of 90 microns. When R90 < 20% is not met. The coal powder as a whole is too coarse and the particle size is too large. These large particles cannot be completely burned in the fluidized bed boiler at one time, thereby causing the carbon content of the fly ash to increase. By screening the coal powder of the pulverized coal burner 20, the stable and efficient operation of the target boiler can be effectively ensured, making the combustion more complete.

[0117] On the other hand, refer to Figure 3 As shown, an embodiment of the present invention further provides a load regulation control device based on pulverized coal circulating fluidized bed co-combustion, which is applicable to the load regulation control method based on pulverized coal circulating fluidized bed co-combustion described in any of the above embodiments. The load regulation control device based on pulverized coal circulating fluidized bed co-combustion includes a target boiler and a controller 30.

[0118] The target boiler includes a circulating fluidized bed boiler 10 and a pulverized coal burner 20 provided on the circulating fluidized bed boiler 10 .

[0119] The controller 30 is configured to respond to a load adjustment instruction from the target power grid, determine a target operating state for the target boiler based on a preset load threshold and the load adjustment instruction, and, when the target operating state is a first state, adjust and control the output of the circulating fluidized bed boiler 10 and the output of the pulverized coal burner 20 based on the load change amount and the load change rate. Furthermore, when the target operating state is a second state, control the output of the pulverized coal burner 20 to a preset steady-state output and adjust and control the output of the circulating fluidized bed boiler 10 based on the load change amount. The load adjustment instruction includes the load change amount and the load change rate.

[0120] The load regulation control device based on the coal powder circulating fluidized bed collaborative combustion provided by the present application is provided with a coal powder burner 20 on the circulating fluidized bed boiler 10, and the load change rate of the target boiler is significantly improved by dynamically adjusting the coal powder of the coal powder burner 20 and the circulating fluidized bed, the rapid response of the load is realized, and the demand of the power grid for rapid peak shaving is met. When working, the two are cooperated and combusted, the combustion stability of the target boiler in the process of rapid load change is ensured, the low load stable combustion capacity and the combustion efficiency are high. In addition, since the adjustment is dynamic, the coal powder consumption and the operation cost are effectively reduced under the condition of ensuring that the load demand can be met.

[0121] The present application also provides a non-transient machine readable medium storing a computer program. Wherein, the computer program is used for making the computer execute the load regulation control method based on the coal powder circulating fluidized bed collaborative combustion described in any one of the above embodiments when the computer program is executed by the processor of the computer.

[0122] The present application also provides a computer program product comprising a computer program. Wherein, the computer program is used for making the computer execute the load regulation control method based on the coal powder circulating fluidized bed collaborative combustion described in any one of the above embodiments when the computer program is executed by the processor of the computer.

[0123] The present application also provides an electronic device comprising at least one processor and a memory communicatively connected with the at least one processor. The memory stores a computer program capable of being executed by the at least one processor, and the computer program is used for making the electronic device execute the load regulation control method based on the coal powder circulating fluidized bed collaborative combustion described in any one of the above embodiments when the computer program is executed by the at least one processor.

[0124] Referring to Figure 4 As shown, the structural block diagram of the electronic device which can be the server or the client as the embodiment of the present application will be described, which is an example of the hardware device which can be applied to each aspect of the present application. The electronic device is intended to represent various forms of digital electronic computer devices, such as laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers and other suitable computers. The electronic device can also represent various forms of mobile devices, such as personal digital processing, cellular phones, smart phones, wearable devices and other similar computing devices. The components shown herein, their connections and relationships, and their functions, are merely examples, and are not intended to limit the implementation of the present application described and / or claimed herein.

[0125] Referring to Figure 4As shown, the electronic device includes a computing unit 401 that can perform various appropriate actions and processes in accordance with a computer program stored in a read only memory (ROM) 402 or a computer program loaded into a random access memory (RAM) 403 from a storage unit 408. In the RAM 403, various programs and data required for operation of the electronic device can also be stored. The computing unit 401, the ROM 402, and the RAM 403 are connected to each other through a bus 404. An input / output (I / O) interface 405 is also connected to the bus 404.

[0126] A plurality of components in the electronic device are connected to the I / O interface 405, including an input unit 406, an output unit 407, the storage unit 408, and a communication unit 409. The input unit 406 can be any type of device capable of inputting information to the electronic device, and can receive inputted numerical or character information, as well as generate key signal inputs related to user settings and / or function controls of the electronic device. The output unit 407 can be any type of device capable of presenting information, and can include, but is not limited to, a display, a speaker, a video / audio output terminal, a vibrator, and / or a printer. The storage unit 408 can include, but is not limited to, a magnetic disk, an optical disk. The communication unit 409 allows the electronic device to exchange information / data with other devices through a computer network such as the Internet and / or various telecommunication networks, and can include, but is not limited to, a modem, a network card, an infrared communication device, and / or a wireless communication transceiver, such as a Bluetooth device, a WiFi device, a WiMax device, a cellular communication device, and / or the like.

[0127] The computing unit 401 can be various general and / or special purpose processing components having processing and computing capabilities. Some examples of the computing unit 401 include, but are not limited to, a CPU, a graphics processing unit (GPU), various special purpose artificial intelligence (AI) computing units, various computing units running machine learning model algorithms, a digital signal processor (DSP), and any appropriate processor, controller, microcontroller, etc. The computing unit 401 performs various methods and processes described above. For example, in some embodiments, the method embodiments of the present application can be implemented as a computer program tangibly embodied in a machine readable medium, such as the storage unit 408. In some embodiments, part or all of the computer program can be loaded and / or installed onto the electronic device via the ROM 402 and / or the communication unit 409. In some embodiments, the computing unit 401 can be configured to perform the above-described methods by any other appropriate means, such as by means of firmware.

[0128] A computer program for implementing the method of the embodiments of the present application can be written in any combination of one or more programming languages. These computer programs can be provided to a processor or controller of a general purpose computer, special purpose computer, or other programmable data processing apparatus to produce a machine, such that the computer program, when executed by the processor or controller, produces the functions / operations specified in the flowcharts and / or the block diagrams. The computer program can be executed entirely on a machine, partially on a machine, partially on a machine as a standalone software package and partially on a remote machine, or entirely on a remote machine or server.

[0129] In the context of the embodiments of the present application, a machine-readable medium can be a tangible medium that can contain or store the program for use by or in connection with an instruction execution system, apparatus, or device. The machine-readable medium can be a machine-readable signal medium or a machine-readable storage medium. The machine-readable signal medium can include, but not limited to, an electronic, magnetic, optical, electromagnetic, or infrared system, apparatus, or device, or any suitable combination of the above. More specific examples of the machine-readable storage medium will include one or more of an electrical connection based on one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above.

[0130] It should be noted that the term "comprising" and variations thereof used in the embodiments of the present application are open-ended, that is, "comprising but not limited to". The term "based on" is "based, at least in part, on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments". The terms "a" and "an" are intended to mean "one or more" unless explicitly indicated to the contrary.

[0131] The various steps in the method implementation provided by the embodiments of the present application can be performed in different orders and / or in parallel. In addition, the method implementation can include additional steps and / or omit the execution of the steps shown. The scope of protection of the present application is not limited in this respect.

[0132] The word "implementation" in this description refers to a specific feature, structure, or characteristic described in connection with an implementation example can be included in at least one implementation of the present application. The phrase appears in various places throughout the specification is not necessarily meant to refer to the same implementation, nor is it meant to imply that the implementation is preferred over or independent of other implementations. Each implementation example in the present description is described in a relevant manner, and the same or similar parts between each implementation example are cross-referenced. In particular, for device, apparatus, system implementation examples, since they are basically similar to method implementation examples, the description is relatively simple, and the relevant parts are referred to the part of the method implementation example.

[0133] The above-described implementations only express several implementation manners of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the protection scope. It should be noted that, for those skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. A load regulation control method based on pulverized coal circulating fluidized bed co-combustion, characterized in that: Including steps: In response to a load adjustment instruction of a target power grid, determining a target operating state of a target boiler based on a preset load threshold and the load adjustment instruction; the preset load threshold includes a preset load amplitude threshold and a preset load rate threshold; the load adjustment instruction includes a load change amount and a load change rate; The target boiler includes a circulating fluidized bed boiler and a pulverized coal burner provided on the circulating fluidized bed boiler; The method includes calculating, based on the load change amount, to obtain a target load change amplitude of the target boiler; calculating, based on the load change rate, to obtain a target load rate of the target boiler; determining, when the absolute value of the target load change amplitude is greater than the absolute value of the preset load amplitude threshold, and the absolute value of the target load rate is greater than the preset load rate threshold, that the target operating state is a first state; and determining, when the absolute value of the target load change amplitude is not greater than the absolute value of the preset load amplitude threshold, or the absolute value of the target load rate is not greater than the preset load rate threshold, that the target operating state is a second state; When the target operating state is the first state, adjusting and controlling the output of the circulating fluidized bed boiler and the output of the pulverized coal burner according to the load change amount and the load change rate; When the target operating state is the second state, the output of the pulverized coal burner is controlled to be a preset steady-state output, and the output of the circulating fluidized bed boiler is adjusted and controlled according to the load variation.

2. The load regulation control method based on pulverized coal circulating fluidized bed co-combustion according to claim 1 is characterized in that: The first state includes a first load-raising sub-state; When the target operating state is the first load increasing sub-state, regulating and controlling the output of the circulating fluidized bed boiler according to the load change amount and the load change rate includes the following steps: Calculating the target amount of pulverized coal increase based on the unit load coal amount and the load change; According to the target pulverized coal increase amount, regulating and controlling the pulverized coal supply amount of the circulating fluidized bed boiler to adjust the output of the circulating fluidized bed boiler; When the target operating state is the first load increasing sub-state, the output of the pulverized coal burner is regulated and controlled according to the load change amount and the load change rate, including the steps of: Calculating according to the load change amount, the load change rate and the rated output of the pulverized coal burner to obtain a first target step amount; Calculating based on the preset steady-state output and rated output of the pulverized coal burner to obtain a maximum increase margin; The pulverized coal supply rate of the pulverized coal burner is regulated and controlled according to the minimum value between the first target step amount and the maximum increase margin, so as to adjust the output of the pulverized coal burner.

3. The load regulation control method based on pulverized coal circulating fluidized bed co-combustion according to claim 2 is characterized in that: The first target step amount is obtained by calculation based on the load change amount, the load change rate and the rated output of the pulverized coal burner, which is expressed as: ， Where, is the first target step amount, is the load variation, is the load change rate, is the rated output of the pulverized coal burner; The maximum increase margin is calculated based on the preset steady-state output and rated output of the pulverized coal burner, and is expressed as: ， Where, For the maximum increase margin, is the preset steady-state output of the pulverized coal burner.

4. The load regulation control method based on pulverized coal circulating fluidized bed co-combustion according to claim 1 is characterized in that: The first state includes a first load-shedding sub-state; When the target operating state is the first load reduction sub-state, regulating and controlling the output of the circulating fluidized bed boiler according to the load change amount and the load change rate includes the following steps: Calculating the target pulverized coal reduction amount based on the unit load coal amount and the load change amount; According to the target pulverized coal reduction amount, regulating and controlling the pulverized coal supply amount of the circulating fluidized bed boiler to adjust the output of the circulating fluidized bed boiler; When the target operating state is the first load reduction sub-state, adjusting and controlling the output of the pulverized coal burner according to the load change amount and the load change rate includes the following steps: Calculating according to the load change amount, the load change rate and the rated output of the pulverized coal burner to obtain a second target step amount; According to the preset steady-state output of the pulverized coal burner and the minimum value of the second target step amount, the pulverized coal supply amount of the pulverized coal burner is regulated and controlled to adjust the output of the pulverized coal burner.

5. The load regulation control method based on pulverized coal circulating fluidized bed co-combustion according to claim 4 is characterized in that: According to the load change , the load change rate and the rated output of the pulverized coal burner Calculate and get the second target step value, which is expressed as: ， in, is the second target step amount.

6. The load regulation control method based on pulverized coal circulating fluidized bed co-combustion according to any one of claims 1 to 5, characterized in that: After adjusting and controlling the output of the circulating fluidized bed boiler and the output of the pulverized coal burner according to the load change amount and the load change rate, the method further includes the following steps: When the bed temperature change rate of the target boiler is greater than a preset load-increasing bed temperature rate threshold, or less than a preset load-decreasing bed temperature rate threshold, the output of the pulverized coal burner is adjusted and controlled according to a preset pulverized coal adjustment rate.

7. The load regulation control method based on pulverized coal circulating fluidized bed co-combustion according to claim 1 is characterized in that: When the target operating state is the second state, the output of the circulating fluidized bed boiler is regulated and controlled according to the load variation, comprising the steps of: Calculating the target pulverized coal adjustment amount based on the unit load coal amount and the load change amount; According to the target pulverized coal adjustment amount, the pulverized coal supply amount of the circulating fluidized bed boiler is regulated and controlled to adjust the output of the circulating fluidized bed boiler.

8. The load regulation control method based on pulverized coal circulating fluidized bed co-combustion according to claim 1 is characterized in that: Also includes the steps: In response to the load of the target power grid being the target load, controlling the output of the pulverized coal burner to be a preset steady-state output; Among them, the rated output of the pulverized coal burner and the preset steady-state output Satisfies the relationship, .

9. A load regulation control device based on pulverized coal circulating fluidized bed co-combustion, applied to the load regulation control method based on pulverized coal circulating fluidized bed co-combustion according to any one of claims 1 to 8, characterized in that: include: The target boiler includes a circulating fluidized bed boiler and a pulverized coal burner provided on the circulating fluidized bed boiler; as well as, a controller, configured to respond to a load adjustment instruction of a target power grid, make a judgment based on a preset load threshold and the load adjustment instruction, and determine a target operating state of a target boiler; The preset load threshold includes a preset load amplitude threshold and a preset load rate threshold, and the load adjustment instruction includes a load change amount and a load change rate; This includes: calculating according to the load change amount to obtain the target load change amplitude of the target boiler; calculating according to the load change rate to obtain the target load rate of the target boiler; when the absolute value of the target load change amplitude is greater than the absolute value of the preset load amplitude threshold, and the absolute value of the target load rate is greater than the preset load rate threshold, determining that the target operating state is the first state; when the absolute value of the target load change amplitude is not greater than the absolute value of the preset load amplitude threshold, or the absolute value of the target load rate is not greater than the preset load rate threshold, determining that the target operating state is the second state; when the target operating state is the first state, adjusting and controlling the output of the circulating fluidized bed boiler and the output of the pulverized coal burner according to the load change amount and the load change rate; when the target operating state is the second state, controlling the output of the pulverized coal burner to the preset steady-state output, and adjusting and controlling the output of the circulating fluidized bed boiler according to the load change amount.

Images