Recirculation comprehensive optimization control method and device, electronic equipment and storage medium

Abstract

The invention discloses a recycling comprehensive optimization control method and device, electronic equipment and a storage medium, a circulating fluidized bed unit is provided with a flue gas recycling system and a hot air recycling system, and the recycling comprehensive optimization control method and device specifically comprise the steps that multiple working parameters of the circulating fluidized bed unit are collected; processing is conducted on the basis of part of the multiple working parameters, a first recirculation control instruction and a second recirculation control instruction are obtained, the flue gas recirculation system is controlled on the basis of the first recirculation control instruction, and the hot air recirculation system is controlled on the basis of the second recirculation control instruction. When the load of the deep peak regulation working condition is changed, the scheme can realize automatic control of flue gas recirculation, so that the flue gas recirculation amount can effectively follow the load change and adapt to the change of the flue gas oxygen content; by automatically controlling the two branch pipelines, the temperature of the flue gas recirculation main pipeline and the temperature of the primary air inlet pipeline are automatically followed to be above the water dew point, generation of condensate water is avoided, and therefore the condensate water is prevented from corroding the main pipeline.

Description

Technical Field

[0001] The present application relates to the technical field of deep peak shaving, and more specifically, to a recirculation comprehensive optimization control method, device, electronic device, and storage medium. Background Art

[0002] With the continuous grid connection of new energy, requirements are put forward for the deep peak shaving flexibility of circulating fluidized bed units. Flue gas recirculation, as a low-nitrogen technology under deep peak shaving, is widely applied to circulating fluidized bed units. Flue gas recirculation can effectively reduce the boiler operation oxygen content under deep peak shaving conditions. Effectively configuring the flue gas recirculation volume can improve the flexibility, safety, and environmental protection of the unit under deep peak shaving conditions. Under the deep peak shaving variable load condition, the flue gas temperature is low and the water content is large. Especially in winter when the outdoor temperature is low, it is necessary to prevent the formation of condensed water from causing pipeline corrosion. Summary of the Invention

[0003] In view of this, the present application provides a recirculation comprehensive optimization control method, device, electronic device, and storage medium, which are used to optimize the control of the recirculation of flue gas and hot air of a circulating fluidized bed unit during deep peak shaving to prevent pipeline corrosion caused by the formation of condensed water.

[0004] In order to achieve the above object, the following solutions are proposed:

[0005] A recirculation comprehensive optimization control method is applied to the control system of a circulating fluidized bed unit. The circulating fluidized bed unit is provided with a flue gas recirculation system and a hot air recirculation system. The recirculation comprehensive optimization control method includes the steps of:

[0006] Collect a plurality of working parameters of the circulating fluidized bed unit;

[0007] Based on some of the plurality of working parameters, process them to obtain a first recirculation control instruction, and based on the first recirculation control instruction, control the flue gas recirculation system. The flue gas recirculation system includes an induced draft fan and a main flue gas recirculation pipeline. The inlet of the main flue gas pipeline is connected to the outlet of the induced draft fan, and the outlet is connected to the inlet of the primary air fan of the circulating fluidized bed unit. A recirculation fan, a flow meter, a thermometer, a hygrometer, an electric regulating valve, and a shut-off valve are arranged on the main flue gas recirculation pipeline;

[0008] Processing is performed based on some of the multiple operating parameters to obtain a second recirculation control instruction, and the hot air recirculation system is controlled based on the second recirculation control instruction. The hot air recirculation system includes an inlet, a first branch pipe and a second branch pipe that are respectively communicated with the inlet. The inlet is communicated with the secondary air preheater of the circulating fluidized bed unit. The first branch pipe is also communicated with the main flue gas recirculation pipe, and the second branch pipe is also communicated with the primary air duct of the circulating fluidized bed unit. Electric control valves are provided on both the first branch pipe and the second branch pipe.

[0009] Optionally, the multiple operating parameters include the actual load of the circulating fluidized bed unit and the oxygen content at the outlet of the preheater, and also include the flow rate, temperature and humidity of the primary air duct, and also include the temperature and air volume from the outlet of the main flue gas recirculation pipe to the primary fan, and also include the flow rate, temperature and humidity of the main flue gas recirculation pipe, and also include the temperature and humidity of the hot air recirculation system.

[0010] Optionally, the processing based on some of the multiple operating parameters to obtain a first recirculation control instruction and controlling the flue gas recirculation system based on the first recirculation control instruction includes the steps of:

[0011] Searching and calculating from the actual load - flue gas recirculation amount broken line function based on the actual load to obtain a set value of the flue gas recirculation amount corresponding to the actual load;

[0012] Performing differential calculation on the oxygen content to obtain a revised value of the flue gas recirculation amount;

[0013] Revising the set value of the flue gas recirculation amount based on the revised value of the flue gas recirculation amount to obtain a controlled set value of the flue gas recirculation amount,

[0014] Performing PID calculation based on the controlled set value of the flue gas recirculation amount and the flow rate of the main flue gas recirculation pipe to obtain the first recirculation control instruction;

[0015] Outputting the first recirculation control instruction to the actuator of the recirculation fan so as to control the recirculation fan.

[0016] Optionally, the revised value of the flue gas recirculation includes a correction signal dead zone.

[0017] Optionally, the processing based on some of the multiple operating parameters to obtain a first recirculation control instruction and controlling the flue gas recirculation system based on the first recirculation control instruction further includes the steps of:

[0018] Real - time monitoring of the change rate of the actual load;

[0019] When the change rate is greater than a preset change rate threshold, stop the correction process for the set value of the flue gas recirculation amount.

[0020] Optionally, processing is performed based on some of the multiple operating parameters to obtain a second recirculation control instruction, and the hot air recirculation system is controlled based on the second recirculation control instruction, including the steps of:

[0021] Calculating a first gas dew point temperature based on the gas temperature and gas humidity between the outlet of the main flue gas recirculation pipeline and the primary fan;

[0022] Calculating a second gas dew point temperature based on the gas temperature and gas humidity of the main flue gas recirculation pipeline;

[0023] Calculating a third cold air dew point temperature based on the gas temperature and gas humidity of the outlet section of the main flue gas recirculation pipeline;

[0024] Calculating the first branch pipeline flow rate set value and the second branch pipeline flow rate set value according to the air volume mass conservation and energy conservation of the main flue gas recirculation pipeline for the first gas dew point temperature, the second gas dew point temperature, and the third cold air dew point temperature;

[0025] Calculating the second recirculation control instruction based on the first branch pipeline flow rate set value and the second branch pipeline flow rate set value;

[0026] Controlling the hot air recirculation system based on the second recirculation control instruction.

[0027] Optionally, calculating the second recirculation control instruction based on the first branch pipeline flow rate set value and the second branch pipeline flow rate set value includes the steps of:

[0028] Performing a PID operation based on the first branch pipeline flow rate set value and the actual flow rate of the first branch pipeline to obtain a first branch pipeline circulation control instruction;

[0029] Performing a PID operation based on the second branch pipeline flow rate set value and the actual flow rate of the second branch pipeline to obtain a second branch pipeline circulation control instruction, and the second recirculation control instruction includes the first branch pipeline circulation control instruction and the second branch pipeline circulation control instruction.

[0030] A recirculation comprehensive optimization control device is applied to the control system of a circulating fluidized bed unit. The circulating fluidized bed unit is provided with a flue gas recirculation system and a hot air recirculation system. The recirculation comprehensive optimization control device includes:

[0031] A parameter acquisition module, configured to acquire a plurality of operating parameters of the circulating fluidized bed unit;

[0032] A first control module, configured to process some of the plurality of operating parameters to obtain a first recirculation control instruction, and implement control on the flue gas recirculation system based on the first recirculation control instruction. The flue gas recirculation system includes an induced draft fan and a main flue gas recirculation pipeline. The inlet of the main flue gas pipeline is connected to the outlet of the induced draft fan, and the outlet is connected to the inlet of the primary air fan of the circulating fluidized bed unit. A recirculation fan, a flow meter, a thermometer, a hygrometer, an electric regulating valve, and a shut-off valve are provided on the main flue gas recirculation pipeline;

[0033] A second control module, configured to process some of the plurality of operating parameters to obtain a second recirculation control instruction, and implement control on the hot air recirculation system based on the second recirculation control instruction. The hot air recirculation system includes an inlet, a first branch pipeline and a second branch pipeline respectively communicating with the inlet. The inlet is connected to the secondary air air preheater of the circulating fluidized bed unit. The first branch pipeline is also connected to the main flue gas recirculation pipeline, and the second branch pipeline is also connected to the primary air duct of the circulating fluidized bed unit. Electric regulating valves are provided on both the first branch pipeline and the second branch pipeline.

[0034] An electronic device, the electronic device includes at least one processor and a memory connected to the processor, wherein:

[0035] The memory is used to store computer programs or instructions;

[0036] The processor is used to execute the computer programs or instructions, so that the electronic device realizes the recirculation comprehensive optimization control method as described above.

[0037] A computer-readable storage medium, applied to an electronic device. The storage medium carries one or more computer programs, and the one or more computer programs can be executed by the electronic device, so that the electronic device realizes the recirculation comprehensive optimization control method as described above.

[0038] As can be seen from the above technical solutions, the present application discloses a recirculation comprehensive optimization control method, device, electronic device, and storage medium. The circulating fluidized bed unit is provided with a flue gas recirculation system and a hot air recirculation system. The recirculation comprehensive optimization control method and device specifically collect multiple working parameters of the circulating fluidized bed unit; process some of the multiple working parameters to obtain a first recirculation control instruction, and control the flue gas recirculation system based on the first recirculation control instruction; process some of the multiple working parameters to obtain a second recirculation control instruction, and control the hot air recirculation system based on the second recirculation control instruction. When changing the load under the deep peak shaving condition, this solution can achieve automatic control of the flue gas recirculation, enabling the flue gas recirculation volume to effectively follow the load change and adapt to the change in flue gas oxygen content; through the automatic control of the two branch pipelines of the hot air recirculation volume, the temperature of the main pipeline of the flue gas recirculation and the temperature of the primary air inlet pipeline are automatically followed above the water dew point, avoiding the generation of condensed water, thereby avoiding the corrosion of the main pipeline by the condensed water. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0040] Figure 1 Schematic diagram of the flue gas recirculation system and the hot air recirculation system for the embodiments of the present application

[0041] Figure 2 Flowchart of a recirculation comprehensive optimization control method for the embodiments of the present application;

[0042] Figure 3 Flowchart of controlling the flue gas recirculation system for the embodiments of the present application;

[0043] Figure 4 Another flowchart of controlling the flue gas recirculation system for the embodiments of the present application;

[0044] Figure 5 Flowchart of controlling the hot air recirculation system for the embodiments of the present application;

[0045] Figure 6 Block diagram of a recirculation comprehensive optimization control device for the embodiments of the present application;

[0046] Figure 7 Schematic diagram of the working principle of the recirculation comprehensive optimization control device for the embodiments of the present application;

[0047] Figure 8 It is a block diagram of an electronic device according to an embodiment of the present application. Specific embodiments

[0048] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present application.

[0049] The present application provides a recirculation comprehensive optimization control scheme for real-time optimization control of the recirculation of flue gas and hot air during deep peak shaving of a circulating fluidized bed unit. The circulating fluidized bed unit in the present application is provided with a flue gas recirculation system and a hot air recirculation system, as Figure 1 shown.

[0050] The flue gas recirculation system includes an induced draft fan and a main flue gas recirculation pipeline. The inlet of the main flue gas pipeline is connected to the outlet of the induced draft fan, and the outlet is connected to the inlet of the primary air fan of the circulating fluidized bed unit. A recirculation fan, a flow meter, a thermometer, a hygrometer, an electric regulating valve and a shut-off valve are arranged on the main flue gas recirculation pipeline. The hot air recirculation system includes an inlet and a first branch pipeline and a second branch pipeline respectively communicating with the inlet. Its inlet is connected to the secondary air air preheater of the circulating fluidized bed unit. The first branch pipeline is also connected to the main flue gas recirculation pipeline, and the second branch pipeline is also connected to the primary air duct of the circulating fluidized bed unit. Electric regulating valves are arranged on both the first branch pipeline and the second branch pipeline.

[0051] Figure 2 It is a flow chart of a recirculation comprehensive optimization control method according to an embodiment of the present application.

[0052] As Figure 2 shown, the recirculation comprehensive optimization control method provided by the present application is applied to the control system of the circulating fluidized bed unit. The control system can be understood as a computer, a server or an embedded device used to control the circulating fluidized bed unit. The recirculation comprehensive optimization control method specifically includes the following steps:

[0053] S1. Collect multiple working parameters of the circulating fluidized bed unit.

[0054] The multiple working parameters include the actual load of the circulating fluidized bed unit and the oxygen content at the outlet of the air preheater, and also include the flow rate, temperature and humidity of the primary air duct, and also include the temperature and air volume from the outlet of the main flue gas recirculation pipeline to the primary air fan, and also include the flow rate, temperature and humidity of the main flue gas recirculation pipeline, and also include the temperature and humidity of the hot air recirculation system.

[0055] S2. Implement control over the flue gas recirculation system based on multiple operating parameters.

[0056] Specifically, process some of the multiple operating parameters to obtain a first recirculation control instruction, and implement control over the flue gas recirculation system based on this first recirculation control instruction. Specifically, it means using this first recirculation control instruction to control the recirculation fan of the flue gas recirculation system. The specific process is as Figure 3 shown:

[0057] S201. Calculate the set value and revised value of the flue gas recirculation volume.

[0058] First, calculate the set value of the flue gas recirculation volume based on the actual load of the circulating fluidized bed unit.

[0059] This application includes an actual load - flue gas recirculation volume broken line function obtained by actual calibration or calculation based on the circulating fluidized bed unit. After obtaining the actual load of the circulating fluidized bed unit, perform a search operation based on this actual load from this broken line function to obtain the set value of the flue gas recirculation volume that matches this actual load.

[0060] Among them, the actual load - flue gas recirculation volume broken line function is:

[0061] D FGRS =f FGRS (Ne),

[0062] Among them, D FGRS is the set value of the flue gas recirculation volume, with the unit of kNm 3 / h; Ne is the actual load of the unit, with the unit of MW.

[0063] Then, perform differential calculation on the oxygen content to obtain the revised value of the flue gas recirculation volume.

[0064] That is, perform differential calculation on the oxygen content at the outlet of the air preheater, and use the obtained change rate of the oxygen content as the revised value of this flue gas recirculation.

[0065] The revised value of the flue gas recirculation volume is:

[0066]

[0067] Among them, O2 is the oxygen content after the air preheater, with the unit of %.

[0068] S202. Perform correction processing on the set value of the flue gas recirculation volume.

[0069] That is, use this revised value of the flue gas recirculation volume to perform correction processing on this set value of the flue gas recirculation volume to obtain the control set value of the flue gas recirculation volume. And use this control set value of the flue gas recirculation volume as this first recirculation control instruction.

[0070] In addition, to prevent false activation or frequent small - scale actions of the dynamic oxygen amount signal in the future, the present application also sets a correction signal dead zone, that is, the revised value of the flue gas recirculation amount is limited within a specific range. When the revised value reaches the boundary of this range, it no longer changes, but this boundary is used as the revised value. This specific value can be calibrated according to the actual engineering situation.

[0071] S203. Obtain the first recirculation control instruction based on the control set value of the flue gas recirculation amount.

[0072] That is, perform PID calculation on the search for the control set value of the flue gas recirculation amount and the flow rate of the main flue gas recirculation pipeline, so as to obtain the first recirculation control instruction.

[0073] S204. Control the recirculation fan based on the first recirculation control instruction.

[0074] That is, output the first recirculation control instruction to the actuator of the recirculation fan to control the recirculation fan.

[0075] In addition, to prevent large - scale fluctuations in the oxygen amount from causing control interference in the future, the present application further includes the following steps, as Figure 4 shown.

[0076] S205. Monitor the change rate of the actual load.

[0077] That is, perform differential calculation on the change rate of the actual load of the circulating fluidized bed unit to obtain the change rate of the actual load.

[0078] S206. Stop the correction process when the change rate reaches the condition.

[0079] That is, when the change rate of the design load reaches the preset change rate threshold, stop the correction process of the flue gas recirculation amount set value, that is, directly use the flue gas recirculation amount set value as the control set value of the flue gas recirculation amount. This change rate threshold can be obtained through experiments or theoretical calculations.

[0080] S3. Control the hot - air recirculation system based on multiple working parameters.

[0081] Specifically, process some of the multiple working parameters to obtain the second recirculation control instruction, and control the hot - air recirculation system based on this second recirculation control instruction. Specifically, control the air volume of the first pipeline and the second pipeline of the hot - air recirculation system. The specific process is as Figure 5 shown.

[0082] S301. Calculate three gas dew - point temperatures.

[0083] The three gas dew point problems are the first gas dew point temperature T1, the second gas dew point temperature T2, and the third gas dew point temperature T3. The specific process is as follows:

[0084] First, calculate based on the gas temperature and gas humidity between the outlet of the main flue gas recirculation pipeline and the primary fan to obtain the first gas dew point temperature. The calculation formula is as follows:

[0085]

[0086] Where: T1 is the actual gas temperature between the outlet of the main flue gas recirculation pipeline and the primary fan, with the unit of °C; RH1 is the gas humidity between the outlet of the main flue gas recirculation pipeline and the primary fan, with the unit of %.

[0087] Then, calculate based on the gas temperature and gas humidity of the main flue gas recirculation pipeline to obtain the second gas dew point temperature. The calculation formula is as follows:

[0088]

[0089] Where: T2 is the gas temperature in the flue gas recirculation pipeline, with the unit of °C; RH2 is the gas humidity in the flue gas recirculation pipeline, with the unit of %.

[0090] Finally, calculate based on the gas temperature and gas humidity at the outlet end of the main flue gas recirculation pipeline to obtain the third cold air dew point temperature. The calculation formula is as follows:

[0091]

[0092] Where: T3 is the gas temperature of the primary cold air from the atmosphere to the outlet section of the main flue gas recirculation pipeline, with the unit of °C; RH3 is the gas humidity of the primary cold air from the atmosphere to the outlet section of the main flue gas recirculation pipeline, with the unit of %.

[0093] S302. Calculate the flow rate setting value of the first pipeline and the flow rate setting value of the second pipeline.

[0094] That is, calculate the first gas dew point temperature, the second gas dew point temperature, and the third gas dew point temperature obtained above according to the air volume mass conservation principle and the energy conservation principle of the main flue gas recirculation pipeline, so as to obtain the flow rate setting value D h1S of the first pipeline h2S and the flow rate setting value D

[0095] of the second pipeline. Specifically as follows:

[0096] k1D h1t1 + k1D FGR t2 = k1(D FGR + D h1 )t 02 ,

[0097]

[0098] where k1 is the specific heat capacity coefficient, assuming the gas specific heat capacity coefficients are equal; D h1 is the flow rate required for the first pipeline, with the unit of KNm 3 / h; t1 is the gas temperature in the first pipeline, with the unit of K; D FGR is the cold primary air inlet flow rate, with the unit of KNm 3 / h; t2 is the gas temperature in the flue gas recirculation main pipeline, with the unit of K; and t 02 = T 02 + 273, with the unit of K.

[0099] Set the offset of D h1 as the flow rate set value D h1S of the first pipeline:

[0100] D h1S = f(D h1 ),

[0101] D h1 The lower limit is set to 0, and a negative value instruction for the set value is prohibited from acting on the actuator all the time.

[0102] Then, according to the principle of mass conservation and energy conservation of the primary cold air volume from the atmosphere to the outlet of the flue gas recirculation main pipeline, calculate the hot air recirculation volume required to heat the cold air to the dew point temperature. The calculation method is as follows:

[0103] k2D h2 t1 + k2D cool t3 = k2(D cool + D h2 )t 03

[0104]

[0105] where k2 is the specific heat capacity coefficient, assuming the gas specific heat capacity coefficients are equal; D h2 is the flow rate required for the second pipeline, with the unit of KNm 3 / h; t1 is the gas temperature in the second pipeline, with the unit of K; D cool is the primary air volume from the atmosphere to the outlet of the flue gas recirculation main pipeline, with the unit of KNm 3 / h; t3 is the gas temperature of the primary air volume from the atmosphere to the outlet of the flue gas recirculation main pipeline, with the unit of K; in addition, t 03 = T03 +273, with the unit of K.

[0106] Take D h2 Set the bias as the flow set value D of the second pipeline h2S :

[0107] D h2S = f(D h2 ),

[0108] D h2 The lower limit is set to 0, and negative set values are prohibited. The instruction always acts on the actuator.

[0109] S303. Calculate the second recirculation control instruction.

[0110] That is, calculate based on the flow set value of the first pipeline and the flow set value of the second pipeline to obtain the second recirculation control instruction, which includes the first pipeline recirculation control instruction and the second pipeline recirculation control instruction. The specific calculation process is as follows:

[0111] On the one hand, calculate the difference between the flow set value of the first pipeline and the actual flow of the first pipeline, and perform PID operation on this difference to obtain the first pipeline recirculation control instruction.

[0112] On the other hand, calculate the difference between the flow set value of the second pipeline and the actual flow of the second pipeline, and then perform PID operation on this difference to obtain the second pipeline recirculation control instruction.

[0113] S304. Control the hot air recirculation system based on the second recirculation control instruction.

[0114] Since the second recirculation control instruction includes the first pipeline recirculation control instruction and the second pipeline recirculation control instruction, controlling the hot air recirculation system here means outputting the first pipeline recirculation control instruction to the actuator of the electric regulating valve of the first pipeline to control the actuator to act; it also includes outputting the second pipeline recirculation control instruction to the actuator of the electric regulating valve of the second pipeline.

[0115] As can be seen from the above technical solution, this embodiment provides a recirculation comprehensive optimization control method. A flue gas recirculation system and a hot air recirculation system are provided in a circulating fluidized bed unit. The specific steps of this recirculation comprehensive optimization control method are as follows: collect multiple operating parameters of the circulating fluidized bed unit; process some of the multiple operating parameters to obtain a first recirculation control instruction, and control the flue gas recirculation system based on the first recirculation control instruction; process some of the multiple operating parameters to obtain a second recirculation control instruction, and control the hot air recirculation system based on the second recirculation control instruction. When the load changes under the deep peak shaving condition, this solution can achieve automatic control of the flue gas recirculation, enabling the flue gas recirculation volume to effectively follow the load change and adapt to the change of the oxygen content in the flue gas; through the automatic control of the two branch pipes of the hot air recirculation volume, the temperature of the main flue gas recirculation pipe and the temperature of the primary air inlet pipe can be automatically followed above the water dew point, avoiding the generation of condensed water, and thus avoiding the corrosion of the main pipe by the condensed water.

[0116] The flowcharts and block diagrams in the accompanying drawings illustrate the possible architectures, functions, and operations of systems, methods, and computer program products according to various embodiments of the present disclosure. In this regard, each block in the flowchart or block diagram may represent a module, a program segment, or a part of code that contains one or more executable instructions for implementing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the blocks may occur in a different order than marked in the accompanying drawings. For example, two consecutive blocks shown may actually be executed substantially in parallel, and they may sometimes be executed in the reverse order, depending on the functions involved. It should also be noted that each block in the block diagram and / or flowchart, and combinations of blocks in the block diagram and / or flowchart, can be implemented by a dedicated hardware-based system for performing the specified functions or operations, or can be implemented by a combination of dedicated hardware and computer instructions.

[0117] Although the operations are depicted in a particular order, this should not be construed as requiring that the operations be performed in the particular order shown or in a sequential order. In certain circumstances, multitasking and parallel processing may be advantageous.

[0118] It should be understood that the various steps recited in the method embodiments of the present disclosure may be executed in a different order and / or in parallel. In addition, the method embodiments may include additional steps and / or omit the steps shown. The scope of the present disclosure is not limited in this regard.

[0119] Computer program code for performing the operations of the present disclosure may be written in one or more programming languages or combinations thereof. The above-mentioned programming languages include, but are not limited to, object-oriented programming languages such as Java, Smalltalk, C++, and also include conventional procedural programming languages such as the C language or similar programming languages. The program code may be executed entirely on the user's computer, partially on the user's computer, executed as a stand-alone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer.

[0120] Figure 6 It is a block diagram of a recycling comprehensive optimization control device according to an embodiment of the present application.

[0121] As Figure 6 shown, the recycling comprehensive optimization control device provided by the present application is applied to the control system of the circulating fluidized bed unit. The control system can be understood as a computer, server or embedded device for controlling the circulating fluidized bed unit. The recycling comprehensive optimization control device specifically includes a parameter acquisition module 10, a first control module 20 and a second control module 30.

[0122] The parameter acquisition module is used to acquire a plurality of operating parameters of the circulating fluidized bed unit.

[0123] The plurality of operating parameters include the actual load of the circulating fluidized bed unit and the oxygen content at the outlet of the air preheater, and also include the flow rate, temperature and humidity of the primary air duct, and also include the temperature and air volume from the outlet of the main flue gas recirculation pipeline to the primary fan, and also include the flow rate, temperature and humidity of the main flue gas recirculation pipeline, and also include the temperature and humidity of the hot air recirculation system.

[0124] The first control module is used to control the flue gas recirculation system based on a plurality of operating parameters.

[0125] Specifically, it is used to process some of the plurality of operating parameters to obtain a first recirculation control instruction, and control the flue gas recirculation system based on the first recirculation control instruction. Specifically, it means using the first recirculation control instruction to control the recirculation fan of the flue gas recirculation system.

[0126] The second control module is used to control the hot air recirculation system based on a plurality of operating parameters.

[0127] Specifically, it is used to process some of the multiple working parameters to obtain a second recirculation control instruction, and based on this second recirculation control instruction, control the hot air recirculation system. Specifically, it controls the air volume of the first pipeline and the second pipeline of the hot air recirculation system.

[0128] The specific working process of the recirculation comprehensive optimization control device in this application is as Figure 7 shown.

[0129] As can be seen from the above technical solutions, this embodiment provides a recirculation comprehensive optimization control device. The circulating fluidized bed unit is provided with a flue gas recirculation system and a hot air recirculation system. The recirculation comprehensive optimization control device is specifically used to collect multiple working parameters of the circulating fluidized bed unit; based on the processing of some of the multiple working parameters, obtain a first recirculation control instruction, and based on the first recirculation control instruction, control the flue gas recirculation system; based on the processing of some of the multiple working parameters, obtain a second recirculation control instruction, and based on the second recirculation control instruction, control the hot air recirculation system. When the load changes under the deep peak shaving condition, this solution can realize the automatic control of the flue gas recirculation, so that the flue gas recirculation volume can effectively follow the load change and adapt to the change of the flue gas oxygen content; through the automatic control of the two pipelines of the hot air recirculation volume, the temperature of the main pipeline of the flue gas recirculation and the temperature of the primary air inlet pipeline are automatically followed above the water dew point, avoiding the generation of condensed water, thereby avoiding the corrosion of the main pipeline by the condensed water.

[0130] The units involved in the embodiments described in this disclosure can be implemented in software or in hardware. Among them, the name of the unit does not constitute a limitation to the unit itself in some cases. For example, the first acquisition unit can also be described as "the unit for acquiring at least two Internet protocol addresses".

[0131] The functions described above in this article can be at least partially executed by one or more hardware logic components. For example, without limitation, the exemplary types of hardware logic components that can be used include: Field Programmable Gate Array (FPGA), Application Specific Integrated Circuit (ASIC), Application Specific Standard Product (ASSP), System on Chip (SOC), Complex Programmable Logic Device (CPLD), and so on.

[0132] Figure 8 It is a block diagram of an electronic device according to an embodiment of this application.

[0133] Next, refer to Figure 8, which shows a schematic structural diagram of an electronic device suitable for implementing the electronic device in the embodiments of the present disclosure. The terminal device in the embodiments of the present disclosure may include, but is not limited to, mobile terminals such as mobile phones, laptop computers, digital broadcast receivers, PDAs (Personal Digital Assistants), PADs (Tablet Computers), PMPs (Portable Multimedia Players), in-vehicle terminals (such as in-vehicle navigation terminals), etc., and fixed terminals such as digital TVs, desktop computers, etc. This electronic device is only an example and should not impose any limitations on the functions and usage scope of the embodiments of the present disclosure.

[0134] The electronic device may include a processing device (such as a central processing unit, a graphics processing unit, etc.) 801, which may perform various appropriate actions and processes according to a program stored in the read-only memory ROM 802 or a program loaded from the input device 806 into the random access memory RAM 803. In the RAM, various programs and data required for the operation of the electronic device are also stored. The processing device, the ROM, and the RAM are connected to each other through a bus 804. The input / output (I / O) interface 805 is also connected to the bus 804.

[0135] Generally, the following devices may be connected to the I / O interface: input devices including, for example, a touch screen, a touchpad, a keyboard, a mouse, a camera, a microphone, an accelerometer, a gyroscope, etc.; an output device 807 including, for example, a liquid crystal display (LCD), a speaker, a vibrator, etc.; a storage device 808 including, for example, a magnetic tape, a hard disk, etc.; and a communication device 809. The communication device 809 may allow the electronic device to communicate with other devices wirelessly or wiredly to exchange data. Although the figure shows an electronic device having various devices, it should be understood that it is not required to implement or include all the shown devices. More or fewer devices may be implemented or included alternatively.

[0136] This application also provides an embodiment of a computer-readable storage medium.

[0137] The computer-readable storage medium is applied to an electronic device and stores one or more computer programs. When the one or more computer programs are executed by the electronic device, the electronic device collects multiple operating parameters of a circulating fluidized bed unit; processes some of the multiple operating parameters to obtain a first recirculation control instruction, and controls a flue gas recirculation system based on the first recirculation control instruction; processes some of the multiple operating parameters to obtain a second recirculation control instruction, and controls a hot air recirculation system based on the second recirculation control instruction. When the load changes under deep peak shaving conditions, this solution can achieve automatic control of the flue gas recirculation, enabling the flue gas recirculation volume to effectively follow the load change and adapt to the change in flue gas oxygen content; through the automatic control of two branch pipes of the hot air recirculation volume, the temperature of the main flue gas recirculation pipe and the temperature of the primary air inlet pipe are automatically maintained above the water dew point, avoiding the generation of condensed water, and thus avoiding the corrosion of the main pipe by the condensed water.

[0138] It should be noted that the computer-readable medium in the present disclosure can be a computer-readable signal medium, a computer-readable storage medium, or any combination of the two. The computer-readable storage medium can be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the above. More specific examples of the computer-readable storage medium can include, but are not limited to: an electrical connection with 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.

[0139] In the present disclosure, the computer-readable storage medium can be any tangible medium that contains or stores a program, and the program can be used by or combined with an instruction execution system, apparatus, or device. In the present disclosure, the computer-readable signal medium can include a data signal propagated in a baseband or as part of a carrier wave, which carries computer-readable program code. Such a propagated data signal can take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the above. The computer-readable signal medium can also be any computer-readable medium other than the computer-readable storage medium, and the computer-readable signal medium can send, propagate, or transmit a program for use by or in combination with an instruction execution system, apparatus, or device. The program code contained on the computer-readable medium can be transmitted by any suitable medium, including but not limited to: wires, optical cables, RF (radio frequency), etc., or any suitable combination of the above.

[0140] Each embodiment in this specification is described in a progressive manner. The key point of each embodiment is to illustrate the differences from other embodiments. For the same or similar parts among the embodiments, reference can be made to each other.

[0141] Although the preferred embodiments of the embodiments of the present invention have been described, those skilled in the art can make additional changes and modifications to these embodiments once they know the basic creative concept. Therefore, the appended claims are intended to be construed as including the preferred embodiments and all changes and modifications falling within the scope of the embodiments of the present invention.

[0142] Finally, it should also be noted that in this text, relative terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or terminal device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or terminal device. Without further limitation, an element defined by the statement "comprising one..." does not exclude the existence of additional identical elements in the process, method, article or terminal device comprising the said element.

[0143] The technical solutions provided by the present invention have been introduced in detail above. Specific examples are used in this text to elaborate on the principles and implementation manners of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manners and application scopes. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. A recirculation comprehensive optimization control method is applied to the control system of a circulating fluidized bed unit. The circulating fluidized bed unit is provided with a flue gas recirculation system and a hot air recirculation system, and is characterized in that, The recirculation comprehensive optimization control method includes the following steps: Collect multiple operating parameters of the circulating fluidized bed unit; Process some of the multiple operating parameters to obtain a first recirculation control instruction, and implement control on the flue gas recirculation system based on the first recirculation control instruction. The flue gas recirculation system includes an induced draft fan and a main flue gas recirculation pipeline. The inlet of the main flue gas pipeline is connected to the outlet of the induced draft fan, and the outlet is connected to the inlet of the primary air fan of the circulating fluidized bed unit. A recirculation fan, a flow meter, a thermometer, a hygrometer, an electric regulating valve, and a shut-off valve are arranged on the main flue gas recirculation pipeline; Process some of the multiple operating parameters to obtain a second recirculation control instruction, and implement control on the hot air recirculation system based on the second recirculation control instruction. The hot air recirculation system includes an inlet, a first branch pipeline and a second branch pipeline respectively connected to the inlet. The inlet is connected to the secondary air preheater of the circulating fluidized bed unit. The first branch pipeline is also connected to the main flue gas recirculation pipeline, and the second branch pipeline is also connected to the primary air duct of the circulating fluidized bed unit. Electric regulating valves are arranged on both the first branch pipeline and the second branch pipeline.

2. The recirculation comprehensive optimization control method according to claim 1, wherein The multiple operating parameters include the actual load of the circulating fluidized bed unit and the oxygen content at the outlet of the air preheater, and also include the flow rate, temperature and humidity of the primary air duct, and also include the temperature and air volume from the outlet of the main flue gas recirculation pipeline to the primary air fan, and also include the flow rate, temperature and humidity of the main flue gas recirculation pipeline, and also include the temperature and humidity of the hot air recirculation system.

3. The recirculation comprehensive optimization control method according to claim 2, wherein The process of processing some of the multiple operating parameters to obtain a first recirculation control instruction and implementing control on the flue gas recirculation system based on the first recirculation control instruction includes the following steps: Search and calculate based on the actual load from the actual load - flue gas recirculation volume broken line function to obtain the set value of the flue gas recirculation volume corresponding to the actual load; Perform differential calculation on the oxygen content to obtain a revised value of the flue gas recirculation volume; Revise the set value of the flue gas recirculation volume based on the revised value of the flue gas recirculation volume to obtain a controlled set value of the flue gas recirculation volume; Perform PID calculation based on the controlled set value of the flue gas recirculation volume and the flow rate of the main flue gas recirculation pipeline to obtain the first recirculation control instruction; Output the first recirculation control instruction to the actuator of the recirculation fan to control the recirculation fan.

4. The recirculation comprehensive optimization control method according to claim 3, wherein, The revised value of the flue gas recirculation includes a correction signal dead zone.

5. The recirculation comprehensive optimization control method according to claim 3, characterized in that, The process of processing some of the multiple operating parameters to obtain a first recirculation control instruction and implementing control on the flue gas recirculation system based on the first recirculation control instruction further includes the following steps: Real-time monitor the change rate of the actual load; When the change rate is greater than the preset change rate threshold, stop the correction process of the set value of the flue gas recirculation volume.

6. The recirculation comprehensive optimization control method according to claim 2, wherein Performing processing based on some of the multiple operating parameters to obtain a second recirculation control instruction, and implementing control over the hot air recirculation system based on the second recirculation control instruction, including the steps of: Calculating a first gas dew point temperature based on the gas temperature and gas humidity between the outlet of the main flue gas recirculation pipeline and the primary air fan; Calculating a second gas dew point temperature based on the gas temperature and gas humidity of the main flue gas recirculation pipeline; Calculating a third cold air dew point temperature based on the gas temperature and gas humidity of the outlet section of the main flue gas recirculation pipeline; Calculating the first branch pipeline flow rate setting value and the second branch pipeline flow rate setting value based on the mass conservation and energy conservation of the air volume of the main flue gas recirculation pipeline for the first gas dew point temperature, the second gas dew point temperature, and the third cold air dew point temperature; Calculating the second recirculation control instruction based on the first branch pipeline flow rate setting value and the second branch pipeline flow rate setting value; Implementing control over the hot air recirculation system based on the second recirculation control instruction.

7. The recirculation comprehensive optimization control method according to claim 6, wherein The calculating the second recirculation control instruction based on the first branch pipeline flow rate setting value and the second branch pipeline flow rate setting value includes the steps of: Performing PID operation based on the first branch pipeline flow rate setting value and the actual flow rate of the first branch pipeline to obtain a first branch pipeline circulation control instruction; Performing PID operation based on the second branch pipeline flow rate setting value and the actual flow rate of the second branch pipeline to obtain a second branch pipeline circulation control instruction, and the second recirculation control instruction includes the first branch pipeline circulation control instruction and the second branch pipeline circulation control instruction.

8. A recirculation comprehensive optimization control device is applied to the control system of a circulating fluidized bed unit. The circulating fluidized bed unit is provided with a flue gas recirculation system and a hot air recirculation system, and is characterized in that The recirculation comprehensive optimization control device includes: A parameter acquisition module configured to acquire multiple operating parameters of the circulating fluidized bed unit; A first control module configured to perform processing based on some of the multiple operating parameters to obtain a first recirculation control instruction, and implementing control over the flue gas recirculation system based on the first recirculation control instruction. The flue gas recirculation system includes an induced draft fan and a main flue gas recirculation pipeline. The inlet of the main flue gas pipeline is connected to the outlet of the induced draft fan, and the outlet is connected to the inlet of the primary air fan of the circulating fluidized bed unit. A recirculation fan, a flow meter, a thermometer, a hygrometer, an electric regulating valve, and a shut-off valve are provided on the main flue gas recirculation pipeline; A second control module configured to perform processing based on some of the multiple operating parameters to obtain a second recirculation control instruction, and implementing control over the hot air recirculation system based on the second recirculation control instruction. The hot air recirculation system includes an inlet and a first branch pipeline and a second branch pipeline respectively communicating with the inlet. The inlet is connected to the secondary air air preheater of the circulating fluidized bed unit. The first branch pipeline is also connected to the main flue gas recirculation pipeline, and the second branch pipeline is also connected to the primary air duct of the circulating fluidized bed unit. Electric regulating valves are provided on both the first branch pipeline and the second branch pipeline.

9. An electronic device, characterized in that, The electronic device includes at least one processor and a memory connected to the processor, wherein: The memory is used for storing computer programs or instructions; The processor is used for executing the computer programs or instructions, so that the electronic device implements the recirculation comprehensive optimization control method described in any one of claims 1 to 7.

10. A computer-readable storage medium, applied to an electronic device, characterized in that, The storage medium carries one or more computer programs, and the one or more computer programs can be executed by the electronic device, so that the electronic device implements the recirculation comprehensive optimization control method described in any one of claims 1 to 7.

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