Load increasing system, method and equipment for circulating fluidized bed coal-fired boiler and storage medium

Abstract

The invention provides a circulating fluidized bed coal-fired boiler load increasing system, method and equipment and a storage medium, and belongs to the field of coal-fired boilers. The system comprises a gasified gas unit used for generating and outputting gasified gas; the boiler unit is used for combusting the gasified gas and outputting generated driving steam; the gas inlet end of the gasified gas distribution unit is communicated with the exhaust end of the gasified gas unit, and the exhaust end of the gasified gas distribution unit is communicated with the gas inlet end of the boiler unit; the gasified gas allocation unit is used for storing the gasified gas output by the gasified gas unit and allocating the output flow of the gasified gas conveyed to the boiler unit according to the load rising rate of the boiler unit. When the unit needs to rapidly rise the load for peak regulation, the gasified gas with the needed flow can be rapidly extracted from the gas storage tank to the circulating fluidized bed boiler, and rapid load rise of the unit is achieved so as to meet the peak regulation power generation requirement. The problem that in the prior art, a gasified gas coupling circulating fluidized bed boiler cannot meet the load increasing requirement during peak shaving is solved.

Description

Technical Field

[0001] The invention relates to the field of coal-fired boilers, and in particular to a circulating fluidized bed coal-fired boiler load increasing system, a circulating fluidized bed coal-fired boiler load increasing method, an electronic device and a computer-readable storage medium. Background Art

[0002] New energy power generation requires power plant boilers to participate in peak load regulation, and the dispatching performance of circulating fluidized bed power plant boilers such as automatic power generation control needs to be improved accordingly; the existing combustion method of biomass gasification gas coupled with circulating fluidized bed boilers is that the gasification gas produced by biomass gasification is directly fed into the circulating fluidized bed for combustion, and the two are carried out continuously.

[0003] However, although the existing fluidized bed combustion has good stability, with the increasing proportion of new energy such as wind and solar power, the fluidized bed is also required to have good load-raising performance. The existing gasification gas-coupled circulating fluidized bed boiler cannot meet the load demand during peak load regulation. Summary of the invention

[0004] The purpose of the embodiments of the present invention is to provide a circulating fluidized bed coal-fired boiler load increasing system, method, equipment and storage medium to solve the problem that the existing gasification gas coupled circulating fluidized bed boiler cannot meet the load demand during peak load regulation.

[0005] In order to achieve the above object, an embodiment of the present invention provides a circulating fluidized bed coal-fired boiler load increasing system, the system comprising:

[0006] A gasification gas unit, used for generating and outputting gasification gas;

[0007] A boiler unit for burning the gasification gas and outputting the generated driving steam;

[0008] A gasification gas preparation unit, wherein the gasification gas preparation unit has an air inlet connected to the gasification gas unit's exhaust end, and the gasification gas preparation unit's exhaust end is connected to the gas inlet of the boiler unit;

[0009] The gasification gas allocation unit is used to store the gasification gas output by the gasification gas unit, and to allocate the output flow rate of the gasification gas delivered to the boiler unit according to the load increase rate of the boiler unit.

[0010] Preferably, the gasification gas unit comprises:

[0011] A gasifier for generating gasification gas;

[0012] A first heat exchanger includes a first high-temperature side and a first low-temperature side, wherein an input end of the first high-temperature side receives the gasification gas output by the gasifier, an output end of the first high-temperature side is connected to an air inlet end of a gasification gas blending unit, and an output end of the first low-temperature side is connected to an input end of the gasifier;

[0013] The gasifying agent conveying device is connected to the input end of the first low-temperature side. The gasifying agent output by the gasifying agent conveying device is heated by the first heat exchanger and then conveyed to the gasifier.

[0014] Preferably, the gasification gas unit further comprises:

[0015] A cyclone separation and dust removal device is arranged between the gasifier and the first heat exchanger. The air inlet end of the cyclone separation and dust removal device is connected to the output end of the gasifier, and the exhaust end of the cyclone separation and dust removal device is connected to the input end of the first high-temperature side. The cyclone separation and dust removal device is used to remove particulate matter in the gasification gas output by the gasifier.

[0016] Preferably, the gasification gas preparation unit comprises:

[0017] At least one gas storage tank, each gas storage tank having an input end connected to an exhaust end of the gasification gas unit and used for storing the gasification gas output by the gasification gas unit;

[0018] At least one first blower, the output end of each first blower is connected to the input end of the corresponding first blower, for adjusting the output flow of the gasified gas delivered to the boiler unit.

[0019] Preferably, the boiler unit comprises:

[0020] A second heat exchanger comprises a second high temperature side and a second low temperature side, wherein an input end of the second high temperature side is connected to an exhaust end of the gasification gas preparation unit;

[0021] A circulating fluidized bed boiler, comprising a primary air inlet, a lower secondary air inlet and an upper secondary air inlet, wherein the lower secondary air inlet is connected to the output end of the second high temperature side, and the upper secondary air inlet is connected to the output end of the second low temperature side;

[0022] A second blower, used for feeding secondary air and primary air into the circulating fluidized bed boiler, wherein a first output end of the second blower is connected to the primary air port, and a second output end of the second blower is connected to an input end of the second low temperature side;

[0023] Coal feeder, used to add fuel to the circulating fluidized bed boiler.

[0024] Preferably, it also includes:

[0025] a steam turbine, the steam input end of which is connected to the exhaust end of the circulating fluidized bed boiler;

[0026] Generator, connected coaxially with the steam turbine.

[0027] The present invention also provides a circulating fluidized bed coal-fired boiler load increasing method, which is implemented based on the above-mentioned circulating fluidized bed coal-fired boiler load increasing system, and the method comprises:

[0028] Get the load increase rate of the boiler unit;

[0029] Determine the adjustment amount of the gasification gas flow rate required for the boiler unit according to the load increase rate;

[0030] A control instruction is generated according to the adjustment amount of the gasification gas flow rate, and the control instruction is sent to the gasification gas allocation unit. When the gasification gas allocation unit executes the control instruction, the output flow rate of the gasification gas of the gasification gas allocation unit is increased.

[0031] Preferably, the gasification gas preparation unit comprises: at least two gas storage tanks, each of which stores gasification gas;

[0032] The method further comprises:

[0033] Obtain the gasification gas temperature value in each gas storage tank in real time;

[0034] When the gasification gas temperature value is less than the preset temperature value, calculating the reduction amplitude of the gasification gas temperature;

[0035] Calculate the temperature reduction ratio of each gas storage tank according to the reduction amplitude of the gasified gas temperature;

[0036] The output flow rate of the vaporized gas of each gas storage tank is allocated according to the temperature reduction ratio and the vaporized gas flow rate required by the current load of the boiler unit.

[0037] On the other hand, the present invention also provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the above-mentioned circulating fluidized bed coal-fired boiler load increasing method when executing the computer program.

[0038] On the other hand, the present invention further provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the above-mentioned circulating fluidized bed coal-fired boiler load increasing method.

[0039] Through the above technical solution, the present invention has at least the following technical effects:

[0040] The system of the present invention allows the two processes of gasification and combustion to proceed independently. Gasification is the preliminary reserve link of combustion. According to the capacity of the circulating fluidized bed boiler and the type of peak regulation, a gas storage tank is used to provide the gasification gas required for peak regulation. Since the upper limit of the capacity of each gas storage tank is generally 10,000 cubic meters, the present invention sets up multiple gas storage tanks; when the unit needs to quickly increase the load for peak regulation, the required flow of gasification gas can be quickly extracted from the gas storage tank to the circulating fluidized bed boiler, so that the unit can quickly increase the load to meet the peak regulation power generation requirements. This solves the problem in the prior art that the gasification gas coupled circulating fluidized bed boiler cannot meet the load increase demand during peak regulation.

[0041] Other features and advantages of the embodiments of the present invention will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] The accompanying drawings are used to provide a further understanding of the embodiments of the present invention and constitute a part of the specification. Together with the following specific implementations, they are used to explain the embodiments of the present invention, but do not constitute a limitation on the embodiments of the present invention. In the accompanying drawings:

[0043] Figure 1 It is a block diagram of a circulating fluidized bed coal-fired boiler load raising system provided by one embodiment of the present invention;

[0044] Figure 2 The present invention is a flowchart of a method for increasing the load of a circulating fluidized bed coal-fired boiler provided in one embodiment of the present invention.

[0045] Description of Reference Numerals

[0046] 1. Gasification furnace; 2. Cyclone separation and dust removal device; 3. First heat exchanger; 4. Gasification agent conveying device; 5. Gas storage tank; 6. First blower; 7. Second heat exchanger; 8. Second blower; 9. Circulating fluidized bed boiler; 10. Coal feeder; 11. Steam turbine; 12. Generator. DETAILED DESCRIPTION

[0047] The specific implementation of the embodiment of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the embodiment of the present invention, and is not used to limit the embodiment of the present invention.

[0048] Embodiment 1

[0049] Figure 1 is a block diagram of a circulating fluidized bed coal-fired boiler load raising system provided by one embodiment of the present invention, such as Figure 1 As shown, this embodiment provides a circulating fluidized bed coal-fired boiler load raising system, the system comprising: a gasification gas unit, a boiler unit and a gasification gas allocation unit;

[0050] The gasification gas unit is used to generate and output gasification gas, and the boiler unit is used to burn the gasification gas and output the generated driving steam;

[0051] The air inlet end of the gasification gas preparation unit is connected to the exhaust end of the gasification gas unit, and the exhaust end of the gasification gas preparation unit is connected to the air inlet end of the boiler unit;

[0052] The gasification gas allocation unit is used to store the gasification gas output by the gasification gas unit, and to allocate the output flow rate of the gasification gas delivered to the boiler unit according to the load increase rate of the boiler unit.

[0053] The circulating fluidized bed coal-fired boiler load-raising system of this embodiment allows the gasification and combustion processes to proceed independently. Gasification is the preliminary reserve link of combustion. According to the capacity of the circulating fluidized bed boiler 9 and the peak-shaving type, a gas storage tank 5 is used to provide the gasification gas required for peak-shaving. Since the upper limit of the capacity of each gas storage tank 5 is generally 10,000 cubic meters, the present invention sets a plurality of gas storage tanks 5; when the unit needs to quickly increase the load for peak-shaving, the required flow of gasification gas can be quickly extracted from the gas storage tank 5 to the circulating fluidized bed boiler 9, so that the unit can quickly increase the load to meet the peak-shaving power generation requirements. This solves the problem in the prior art that the gasification gas coupled circulating fluidized bed boiler 9 cannot meet the load-raising requirements during peak-shaving.

[0054] As a further optimization of this embodiment, the gasification gas unit includes: a gasification furnace 1, a gasification agent conveying device 4, a first heat exchanger 3 and a cyclone separation and dust removal device 2;

[0055] The gasifier 1 is used to generate gasification gas, and the gasifier conveying device 4 is used to input the gasifier into the gasifier 1. The gasifier is air or water vapor required by the gasifier 1.

[0056] The first heat exchanger 3 includes a first high-temperature side and a first low-temperature side. The input end of the first high-temperature side receives the gasification gas output by the gasifier 1, the output end of the first high-temperature side is connected to the air inlet end of the gasification gas blending unit, and the output end of the first low-temperature side is connected to the input end of the gasifier 1.

[0057] The output end of the gasifying agent conveying device 4 is connected to the input end of the first low-temperature side. The gasifying agent output by the gasifying agent conveying device 4 is heated by the first heat exchanger 3 and then conveyed to the gasifier 1. The gasifying agent is heated by the high-temperature gasification gas to increase the temperature of the gasifying agent and improve the utilization rate of thermal energy.

[0058] The cyclone separation and dust removal device 2 is arranged between the gasifier 1 and the first heat exchanger 3, the air inlet end of the cyclone separation and dust removal device 2 is connected to the output end of the gasifier 1, and the exhaust end of the cyclone separation and dust removal device 2 is connected to the input end of the first high-temperature side; the cyclone separation and dust removal device 2 is used to remove particulate matter in the gasification gas output by the gasifier 1.

[0059] In this embodiment, after the gasification gas generated by the gasification furnace 1 passes through the cyclone separation and dust removal device 22 to remove particulate matter, the gasification gas is input into the first heat exchanger 3 to reduce the temperature of the gasification gas to about 450° C. and then stored in the gas storage tank 5.

[0060] Secondly, the gasifying agent such as air or water vapor required by the gasifier 1 passes through the first heat exchanger 3 and is heated to a certain extent under the condition that the gasification gas is cooled to about 450°C. The gasifying agent can be further heated to the required furnace entry temperature by the front heater.

[0061] As a further optimization of this embodiment, the gasification gas preparation unit includes:

[0062] At least one gas storage tank 5, the input end of each gas storage tank 5 is connected to the exhaust end of the gasification gas unit, and is used to store the gasification gas output by the gasification gas unit. In this embodiment, the capacity of the gasifier 1 and the number of gas storage tanks 5 are selected to match the unit capacity and peak-shaving type.

[0063] In this embodiment, each gas storage tank 5 includes: a gas tank, a pressure gauge, a safety valve, an air inlet pipeline and an air outlet pipeline. The pressure gauge and the safety valve are installed on the gas tank. The air inlet pipeline is connected to the output end of the first high-temperature side of the first heat exchanger 3. A flame arrester and a pressure controller are provided on the air outlet pipeline. A tar collection bin is provided at the bottom of the gas tank.

[0064] Since the gas storage tank 5 has a certain degree of heat dissipation, in order to keep the tar contained in the gasification gas in a gaseous state as a whole, the gas storage temperature in the gas storage tank 5 needs to be maintained at 430°C to 450°C. The tar and the gasification gas can be put into the circulating fluidized bed together for combustion utilization.

[0065] At least one first blower 6, the output end of each first blower 6 is connected to the input end of the corresponding first blower 6, for adjusting the output flow of the gasified gas delivered to the boiler unit.

[0066] In this embodiment, the adjustment amount of the gasification gas flow rate required by the boiler unit is calculated according to the load increase rate of the boiler unit, and the gasification gas allocation unit then adjusts the output of the gas storage tank 5 according to the adjustment amount of the gasification gas flow rate to achieve the load increase of the boiler unit.

[0067] A compressor is arranged at the outlet pipeline of the gas storage tank to increase the pressure of the gasified gas so that it can flow through the second heat exchanger 7 to the secondary air outlet of the circulating fluidized bed, and the gasified gas has a certain speed of entering the furnace to ensure its ignition and combustion. The gasified gas input temperature is 380℃-400℃, so that it can be easily ignited and burned after being put into the circulating fluidized bed boiler.

[0068] As a further optimization of this embodiment, the boiler unit includes: a second heat exchanger 7, a circulating fluidized bed boiler 9, a second air blower 8 and a coal feeder 10;

[0069] The second heat exchanger 7 comprises a second high temperature side and a second low temperature side, wherein the input end of the second high temperature side is connected to the exhaust end of the gasification gas preparation unit;

[0070] The circulating fluidized bed boiler 9 comprises a primary air inlet, a lower secondary air inlet and an upper secondary air inlet, wherein the lower secondary air inlet is connected to the output end of the second high temperature side, and the upper secondary air inlet is connected to the output end of the second low temperature side;

[0071] The second blower 8 is used to input secondary air and primary air into the circulating fluidized bed boiler 9, the first output end of the second blower 8 is connected to the primary air port, and the second output end of the second blower 8 is connected to the input end of the second low temperature side;

[0072] The coal feeder 10 is used to add fuel into the circulating fluidized bed boiler 9 .

[0073] In this embodiment, the gasified gas in the gas storage tank 5 is transported to the second heat exchanger 7 through the first blower 6. The second heat exchanger 7 reduces the temperature of the gasified gas to 380°C-400°C, and then feeds the gasified gas into the furnace through the lower secondary air inlet of the circulating fluidized bed boiler 9 for combustion.

[0074] Under the premise of ensuring stable fluidized combustion of the circulating fluidized bed boiler 9, an appropriate amount of bed material is added when necessary to ensure a reasonable bed inventory to maintain a normal bed pressure. The heat ratio of gasification gas to coal gradually increases within the range of 1:10-1:3, and the total air volume is adjusted accordingly so that the total excess air coefficient of the composite fuel is maintained at 1.2. Coal is still fed from the feed port, while gasification gas is fed from the lower secondary air port. A graded air distribution method is adopted accordingly, and the primary air flow rate is adjusted so that the ratio of primary and secondary air is 50:50. The primary air is fed from the primary air port at the bottom of the furnace, and uniform air distribution is achieved through the air distribution plate to maintain a good fluidized state. The excess air coefficient of the furnace space below the secondary air port is much less than 1, so that the composite fuel is ignited and burned in a reducing atmosphere, which is beneficial to suppressing the formation of NOx; secondary air is fed into the upper secondary air port to achieve further combustion of the gasification gas and volatiles released by the coal.

[0075] The secondary air required by the circulating fluidized bed boiler passes through the gasification gas low-temperature heat exchanger, and is heated to a certain extent under the condition that the gasification gas is cooled to 380℃-400℃, and then is fed into the fluidized bed to promote the combustion of the gasification gas.

[0076] As a further optimization of this embodiment, the system further includes: a steam turbine 11 and a generator 12;

[0077] The steam input end of the steam turbine 11 is connected to the exhaust end of the circulating fluidized bed boiler 9, and the driving steam generated by the circulating fluidized bed boiler 9 is input into the steam turbine 11 to drive the steam turbine 11 to do work; the generator 12 is coaxially connected to the steam turbine 11.

[0078] Embodiment 2

[0079] Figure 2 is a flow chart of a method for increasing the load of a circulating fluidized bed coal-fired boiler provided in one embodiment of the present invention, such as Figure 2 As shown, this embodiment provides a circulating fluidized bed coal-fired boiler load increasing method, which is implemented based on the circulating fluidized bed coal-fired boiler load increasing system of embodiment 1, and the method includes:

[0080] Step S101: obtaining the load increase rate of the boiler unit;

[0081] Step S102: determining the adjustment amount of the gasification gas flow rate required by the boiler unit according to the load increase rate, wherein the adjustment amount is the increase in the gasification gas flow rate per unit time;

[0082] Step S103: Generate a control instruction according to the adjustment amount of the gasification gas flow rate, and send the control instruction to the gasification gas allocation unit. When the gasification gas allocation unit executes the control instruction, the output flow rate of the gasification gas of the gasification gas allocation unit is increased, that is, the output flow rate of the gasification gas of the gasification gas allocation unit is increased according to the increase in the gasification gas flow rate per unit time, so as to increase the load of the boiler unit.

[0083] In this embodiment, for the load reduction of the boiler unit, the load reduction rate of the boiler unit is also obtained, and the adjustment amount of the gasification gas flow rate required for the boiler unit is determined according to the load reduction rate. At this time, the adjustment amount is the reduction in the gasification gas flow rate per unit time. When the gasification gas adjustment unit executes the control instruction, the output of the gasification gas of the gasification gas adjustment unit is reduced, that is, the output of the gasification gas of the gasification gas adjustment unit is reduced according to the reduction in the gasification gas flow rate per unit time, thereby realizing the load reduction of the boiler unit.

[0084] As a further optimization of this embodiment, the gasification gas allocation unit includes: at least two gas storage tanks 5, each of which stores gasification. Since the gas storage tank 5 will have heat loss, the longer the gasification gas in the gas storage tank 5 is stored, the higher the heat loss of the gasification gas will be, and the tar gas in the gasification gas will be liquefied, which will increase the tar emission of the gas storage tank 5. When the tar increases to a certain amount, the gas storage tank 5 needs to be cleaned. The lower the temperature, the higher the maintenance frequency of the gas storage tank 5, which increases the maintenance work intensity and maintenance cost.

[0085] In order to avoid excessive heat loss of the gasified gas in the gas storage tank 5, the method further includes:

[0086] Step a01: obtaining the gasification gas temperature value in each gas storage tank 5 in real time;

[0087] Step a02: when the gasification gas temperature value is less than a preset temperature value, calculating the reduction amplitude of the gasification gas temperature. In this embodiment, the preset temperature value is 440° C.;

[0088] Step a03: Calculate the temperature reduction ratio of each gas storage tank 5 according to the reduction amplitude of the gasified gas temperature;

[0089] Specifically, the reduction amplitudes of the gasification gas temperature of all gas storage tanks 5 are summed to obtain a total reduction amplitude, and then the reduction amplitude of the gasification gas temperature of each gas storage tank 5 is divided by the total reduction amplitude to obtain a temperature reduction ratio of each gas storage tank 5;

[0090] Step a04: Allocate the gasification gas output flow rate of each gas storage tank 5 according to the temperature reduction ratio and the gasification gas flow rate required by the current load of the boiler unit.

[0091] In this embodiment, the lower the temperature of the gas storage tank 5, the greater the output flow rate of the gasified gas thereof, and the greater the output flow rate of the gasified gas of all the gas storage tanks 5, so as to avoid the gasified gas in the gas storage tank 5 being stored for too long and causing the tar to be liquefied.

[0092] As a further optimization of this embodiment, when the temperature of the gasified gas in a certain gas storage tank 5 drops to 410°C, the gasified gas output flow rate of the gas storage tank 5 is equal to the gasified gas flow rate required under the current load of the boiler unit, and the other gas storage tanks 5 stop outputting the gasified gas. At the same time, the gasifier 1 transports the gasified gas in a high-temperature state to the gas storage tank 5 to increase the temperature of the gasified gas in the gas storage tank 5; when the temperature of the gasified gas in the gas storage tank 5 rises to 420°C, the output flow rate of the gasified gas of each gas storage tank 5 is distributed according to the method of steps a01 to a04.

[0093] This embodiment also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the above-mentioned circulating fluidized bed coal-fired boiler load increase method when executing the computer program.

[0094] This embodiment also provides a computer-readable storage medium on which a computer program is stored. When the program is executed by a processor, the above-mentioned circulating fluidized bed coal-fired boiler load increasing method is implemented.

[0095] Embodiment 3

[0096] In this embodiment, a typical self-provided power plant 20MW circulating fluidized bed boiler 9 unit is selected, and the peak load operation scenario of the unit is from 30% peak load depth to 100% load at a load increase rate of 1.5% / min. In this process, the input gasification gas accounts for 40% of the calorific value of the composite fuel. The design capacity of the gas storage tank 5 is estimated to be 2000 cubic meters, and a 2000 cubic meter gas storage tank 5 can be used. Assuming that the unit adopts a weekly peak load mode, the gas storage capacity is filled according to the continuous operation of the gasifier 1 for 7 days, and the biomass feed rate of the gasifier 1 is 5t / h.

[0097] Operation scenario of rapid load increase during peak load regulation:

[0098] 1. Daily Deep Peak Shaving

[0099] In view of the hot weather in summer and autumn, photovoltaic power stations among new energy sources generate electricity during the day, wind power stations are highly random and the average power load accounts for a certain proportion, and the power load of residents' air conditioners is high at night, and it is necessary to start peak-shaving power stations to supplement the power load. Under the daily deep peak-shaving mode, when the new energy power generation is sufficient, the circulating fluidized bed boiler unit 9 is in a deep peak-shaving state of 30%-40% of the rated load. When the new energy power generation is insufficient, the circulating fluidized bed boiler unit 9 uses gasification gas to achieve rapid load increase to provide supplementary electricity.

[0100] 2. Daily routine peak load regulation

[0101] In view of the cold weather in winter and spring in northern regions, the daytime light intensity and power generation of photovoltaic power stations among new energy sources decrease, and the average power load of wind power stations increases in the winter and spring seasons with abundant wind energy. In general, the daily power generation is lower than that in summer. Under the daily conventional peak-shaving mode, when the power generation of new energy is sufficient during the day, the circulating fluidized bed boiler unit 9 is in a conventional peak-shaving state of 45% to 55% of the rated load. The operating load ratio of the heating units during the heating period is even higher. When the power generation of new energy is insufficient, the circulating fluidized bed boiler unit 9 uses gasification gas to achieve rapid load increase to provide supplementary electricity.

[0102] 3. Multi-day peak load regulation

[0103] In response to random climate phenomena such as continuous rainy or windless weather encountered throughout the year, the daily power generation load of photovoltaic power stations in the new energy sector has been greatly reduced, and the power generation load of wind power stations has also been reduced. Under the multi-day peak-shaving mode, the circulating fluidized bed boiler unit 9 uses gasification gas to achieve rapid load increase, providing supplementary electricity for several days when the new energy power generation has decreased.

[0104] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0105] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0106] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0107] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0108] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0109] The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory in the form of read-only memory (ROM) or flash RAM. The memory is an example of a computer-readable medium.

[0110] Computer readable media include permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology to store information. Information can be computer readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disk read-only memory (CD-ROM), digital versatile disk (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer readable media does not include temporary computer readable media (transitory media), such as modulated data signals and carrier waves.

[0111] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0112] The above are only embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included within the scope of the claims of the present application.

Claims

1. A circulating fluidized bed coal-fired boiler load raising system, characterized in that: The system comprises: A gasification gas unit, used for generating and outputting gasification gas; A boiler unit for burning the gasification gas and outputting the generated driving steam; A gasification gas preparation unit, wherein the gasification gas preparation unit has an air inlet connected to the gasification gas unit's exhaust end, and the gasification gas preparation unit's exhaust end is connected to the gas inlet of the boiler unit; The gasification gas allocation unit is used to store the gasification gas output by the gasification gas unit, and to allocate the output flow of the gasification gas to the boiler unit according to the load increase rate of the boiler unit.

2. The circulating fluidized bed coal-fired boiler load increasing system according to claim 1, characterized in that: The gasification gas unit comprises: A gasifier (1) for generating gasification gas; A first heat exchanger (3) comprises a first high-temperature side and a first low-temperature side, wherein an input end of the first high-temperature side receives gasification gas output by the gasifier (1), an output end of the first high-temperature side is connected to an air inlet end of a gasification gas preparation unit, and an output end of the first low-temperature side is connected to an input end of the gasifier (1); The gasifying agent conveying device (4) is connected to the input end of the first low-temperature side, and the gasifying agent output by the gasifying agent conveying device (4) is heated by the first heat exchanger (3) and then conveyed to the gasifier (1).

3. The circulating fluidized bed coal-fired boiler load increasing system according to claim 2, characterized in that: The gasification gas unit also includes: A cyclone separation and dust removal device (2) is arranged between the gasifier (1) and the first heat exchanger (3); the air inlet end of the cyclone separation and dust removal device (2) is connected to the output end of the gasifier (1), and the exhaust end of the cyclone separation and dust removal device (2) is connected to the input end of the first high-temperature side; the cyclone separation and dust removal device (2) is used to remove particulate matter in the gasification gas output by the gasifier (1).

4. The circulating fluidized bed coal-fired boiler load increasing system according to claim 1, characterized in that: The gasification gas preparation unit includes: at least one gas storage tank (5), the input end of each gas storage tank (5) being in communication with the exhaust end of the gasification gas unit and being used for storing the gasification gas output by the gasification gas unit; At least one first blower (6), the output end of each first blower (6) is connected to the input end of the corresponding first blower (6) for adjusting the output flow of the gasified gas delivered to the boiler unit.

5. The circulating fluidized bed coal-fired boiler load increasing system according to claim 1, characterized in that: The boiler unit comprises: A second heat exchanger (7), comprising a second high-temperature side and a second low-temperature side, wherein an input end of the second high-temperature side is connected to an exhaust end of the gasification gas preparation unit; A circulating fluidized bed boiler (9), comprising a primary air inlet, a lower secondary air inlet and an upper secondary air inlet, wherein the lower secondary air inlet is connected to an output end of a second high temperature side, and the upper secondary air inlet is connected to an output end of a second low temperature side; a second air blower (8) for supplying secondary air and primary air into the circulating fluidized bed boiler (9), wherein a first output end of the second air blower (8) is connected to the primary air port, and a second output end of the second air blower (8) is connected to an input end of the second low-temperature side; A coal feeder (10) is used to add fuel into a circulating fluidized bed boiler (9).

6. The circulating fluidized bed coal-fired boiler load increasing system according to claim 5, characterized in that: Also includes: A steam turbine (11), the steam input end of which is connected to the exhaust end of the circulating fluidized bed boiler (9); The generator (12) is coaxially connected to the steam turbine (11).

7. A method for increasing the load of a circulating fluidized bed coal-fired boiler, which is implemented based on the circulating fluidized bed coal-fired boiler load increasing system according to any one of claims 1 to 6, characterized in that: The method comprises: Get the load increase rate of the boiler unit; Determine the adjustment amount of the gasification gas flow rate required for the boiler unit according to the load increase rate; A control instruction is generated according to the adjustment amount of the gasification gas flow rate, and the control instruction is sent to the gasification gas allocation unit. When the gasification gas allocation unit executes the control instruction, the output flow rate of the gasification gas of the gasification gas allocation unit is increased.

8. The method according to claim 7, characterized in that The gasification gas preparation unit comprises: at least two gas storage tanks, each of which stores gasification gas; The method further comprises: Obtain the gasification gas temperature value in each gas storage tank in real time; When the gasification gas temperature value is less than the preset temperature value, calculating the reduction amplitude of the gasification gas temperature; Calculate the temperature reduction ratio of each gas storage tank according to the reduction amplitude of the gasified gas temperature; The gasification gas output flow of each gas storage tank is allocated according to the current load gasification gas flow and temperature reduction ratio of the boiler unit.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the circulating fluidized bed coal-fired boiler load increasing method according to claim 7 or 8 is implemented.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the circulating fluidized bed coal-fired boiler load increasing method according to claim 7 or 8 is implemented.

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