Biomass blending combustion power generation system

Abstract

The invention relates to the field of biomass utilization, and discloses a biomass blending combustion power generation system which sequentially comprises a biomass unloading unit, a combustion unit, a combustion unit and a combustion unit in the flowing direction of fuel, and the biomass unloading unit is used for receiving the fuel and preliminarily distributing the fuel; the inlet end of the biomass stacking and taking unit is connected with the outlet end of the biomass discharging unit, and the biomass stacking and taking unit is used for stacking fuel in a partitioned mode and taking the fuel according to needs; the inlet end of the biomass blending combustion unit is connected with the outlet end of the biomass stacking and taking unit, and the biomass blending combustion unit is used for metering and detecting taken fuel and is used for accurate feeding; through full-automatic unloading, material piling and taking, accurate metering and closed-loop control, unmanned operation of the whole biomass blending combustion power generation process is achieved, the problems that a traditional mode depends on manpower, efficiency is low and safety is poor are effectively solved, and blending combustion efficiency and boiler operation stability are remarkably improved.

Description

Technical Field

[0001] This invention relates to the field of biomass utilization, and in particular to a biomass co-firing power generation system. Background Technology

[0002] Biomass energy, as an important component of renewable energy, plays a vital role in optimizing the energy structure and improving the ecological environment through its efficient utilization. Currently, there are three main technical routes for achieving biomass co-firing in coal-fired power units: direct co-combustion technology in coal-fired boilers, gasification-coupled combustion technology, and parallel combustion technology. However, these existing technologies all have limitations to varying degrees: for example, gasification-coupled combustion technology suffers from high investment, system complexity, and limited processing capacity; parallel combustion technology has disadvantages such as high investment and operating costs, the need for additional operators, and inflexible system switching; while the relatively widely used direct co-combustion technology in coal-fired boilers, although with lower initial investment, in actual projects, the newly added co-firing system usually still relies on manual feeding and process control of biomass fuel, resulting in low automation and difficulty in meeting the requirements for precise, efficient, and safe large-scale co-firing. Summary of the Invention

[0003] Therefore, the technical problem to be solved by the present invention is that existing biomass co-firing technologies, especially direct co-firing methods, generally suffer from low levels of automation, reliance on manual operation, insufficient control precision, and difficulty in balancing system safety and economy.

[0004] The above-mentioned technical problems are solved by the following technical solution: This invention proposes a biomass co-firing power generation system, which includes, sequentially along the fuel flow direction, A biomass unloading unit, which is used to receive fuel and initially distribute the fuel; A biomass stack-reclaimer unit, the inlet end of which is connected to the outlet end of the biomass unloading unit, is used to store fuel in sections and to take fuel as needed; A biomass co-firing unit, the inlet of which is connected to the outlet of the biomass stack-reclaim unit, the biomass co-firing unit metering and detecting the fuel used for precise feeding; A backflow prevention feeding unit is provided, the inlet end of which is connected to the outlet end of the biomass co-firing unit. The backflow prevention feeding unit is used to safely feed fuel into the boiler. It also includes an automatic co-firing management platform, which is communicatively connected to the biomass unloading unit, the biomass stacking and reclaiming unit, the biomass co-firing unit, and the flue gas backflow prevention feeding unit, and is used to control the entire system; The automatic co-firing management platform is used to receive the boiler load signal and the real-time fuel characteristic data of the biomass co-firing unit, and to send control commands to the biomass co-firing unit according to the load signal and the real-time fuel characteristic data to adjust the feed rate. Specifically, biomass fuel is first received and initially allocated by the biomass unloading unit, and then transferred to the biomass stack-reclaim unit for storage. When co-firing is required, the biomass stack-reclaim unit retrieves fuel as needed and sends it to the biomass co-firing unit for precise metering, detection, and feeding. Finally, it is safely fed into the boiler for combustion through the anti-backflow feeding unit. Furthermore, the automatic co-firing management platform dynamically calculates and adjusts the feed rate by receiving real-time load signals from the boiler and fuel characteristic data fed back from the biomass co-firing unit, achieving a closed-loop control between the biomass fuel co-firing process and the boiler's operating conditions. This method effectively solves the problem of relying on manual feeding in traditional co-firing processes, achieving full automation from fuel arrival to combustion in the furnace, thereby significantly improving co-firing efficiency and boiler operational stability.

[0005] In a preferred embodiment of the biomass co-firing power generation system of the present invention: the biomass unloading unit includes an unloading platform, a uniform unloading auger disposed below the unloading platform, and a first conveyor belt disposed at the discharge end of the uniform unloading auger; an automatic sampling device is disposed on the outside of the first conveyor belt, and the automatic sampling device is used to collect the fuel conveyed by the first conveyor belt. Specifically, fuel is received through the unloading platform, and the fuel is initially homogenized by the uniform unloading auger to avoid fuel accumulation and blockage. Then it is transported by the first conveyor belt. The automatic sampling device set outside the first conveyor belt can automatically and randomly collect fuel samples during the transportation process to provide samples for subsequent testing.

[0006] In a preferred embodiment of the biomass co-firing power generation system of the present invention: a plow-type unloader controlled by an automatic unloading control module is provided at the end of the first conveyor belt; the automatic unloading control module controls the plow-type unloader to operate and automatically unload different types or batches of fuel conveyed by the first conveyor belt into different predetermined areas of the partitioned biomass shed.

[0007] In a preferred embodiment of the biomass co-firing power generation system of the present invention: the biomass stacking and reclaiming unit includes partitioned biomass sheds and a fully automatic grab bucket bridge crane erected above the partitioned biomass sheds; the partitioned biomass sheds can physically isolate and store fuels with different characteristics, while the fully automatic grab bucket bridge crane can automatically complete the stacking and reclaiming operations according to the specifications of the automatic co-firing management platform.

[0008] In a preferred embodiment of the biomass co-firing power generation system of the present invention: the biomass stacking and reclaiming unit further includes an automatic fire-fighting device, which is installed in the partitioned biomass shed; the automatic fire-fighting device can monitor the temperature and smoke parameters of the partitioned biomass shed, thereby preventing fires.

[0009] In a preferred embodiment of the biomass co-firing power generation system of the present invention: the biomass co-firing unit includes a receiving port constituting the inlet end of the biomass co-firing unit, a uniform feeding device disposed below the receiving port, a second conveyor belt disposed below the outlet end of the uniform feeding device, and a material distribution device disposed at the end of the second conveyor belt; the drive motor of the uniform feeding device is electrically connected to the automatic co-firing management platform; an iron remover, a weighing and metering device, and an online calorific value monitoring device are sequentially installed on the outer side of the second conveyor belt along the conveying direction of the second conveyor belt. Specifically, fuel enters through the receiving port and is controlled stably and evenly by the uniform feeding device, and finally transported by the second conveyor belt. During the process of fuel being transported by the second conveyor belt, the iron remover can remove iron impurities from the fuel to protect downstream equipment. The weighing and metering device measures the feed amount in real time to ensure the accuracy of the blending ratio. The online calorific value monitoring device analyzes the calorific value of the fuel in real time and provides feedback signals for the control of the automatic blending management platform.

[0010] In a preferred embodiment of the biomass co-firing power generation system of the present invention: the anti-backflow feeding unit includes an anti-backflow feeder constituting the inlet end of the anti-backflow feeding unit and a quick-closing valve disposed at the outlet end of the anti-backflow feeder, the output end of the quick-closing valve being used to connect to the boiler; the anti-backflow feeder is connected to a high-pressure blower through an air duct, the high-pressure blower providing sealing air pressure to the anti-backflow feeder and forming a negative pressure at the inlet end of the anti-backflow feeder; Specifically, the high-pressure blower provides sealing air pressure, creating and maintaining a stable negative pressure zone at the feed inlet of the anti-backflow feeder, thereby effectively preventing boiler flue gas from backflowing to the front end; and the quick-closing valve can quickly disconnect the anti-backflow feeder from the boiler as needed.

[0011] In a preferred embodiment of the biomass co-firing power generation system of the present invention: the automatic co-firing management platform issues instructions to the biomass stacking and reclaiming unit based on the inventory information and fuel analysis data of the partitioned biomass sheds, recommending and controlling the fully automatic grab bucket bridge crane to grab specific types of fuel; In addition to real-time control of the overall system, the automatic blending management platform can also integrate the inventory information and fuel analysis data of the biomass sheds in each zone to proactively recommend the optimal blending fuel type and directly issue instructions to the fully automatic grab bucket crane to control it to grab specific types of fuel.

[0012] The beneficial effects of this invention are as follows: through fully automatic unloading, stacking and reclaiming, precise metering and closed-loop control, the whole process of biomass co-firing power generation is unmanned, which effectively solves the problems of reliance on manual labor, low efficiency and poor safety in traditional methods, and significantly improves co-firing efficiency, boiler operation stability and the level of refined fuel management. Attached Figure Description

[0013] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings of the embodiments of the present invention will be briefly described below. Obviously, the drawings described below only relate to some embodiments of the present invention and are not intended to limit the present invention.

[0014] Figure 1 The ZZZ diagram of the present invention is shown. Detailed Implementation

[0015] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0016] The terminology used in this invention is that which is currently widely used in the art in consideration of the function of the invention; however, these terms may vary according to the intent of those skilled in the art, precedent, or new technology in the art. Furthermore, specific terms may be chosen by the applicant, and in such cases, their detailed meanings will be described in the detailed description of the invention. Therefore, the terms used in this specification should not be construed as simple names, but rather based on their meanings and the overall description of the invention.

[0017] Reference Figure 1 This embodiment provides a biomass co-firing power generation system, which includes, in sequence along the fuel flow direction, Biomass unloading unit 1 is used to receive fuel and initially distribute the fuel. Biomass stack-reclaimer unit 2, the inlet end of which is connected to the outlet end of biomass unloading unit 1, is used to store fuel in sections and to take fuel as needed. Biomass co-firing unit 3, the inlet end of biomass co-firing unit 3 is connected to the outlet end of biomass stack reclaiming unit 2, biomass co-firing unit 3 measures and detects the fuel taken, for precise feeding. The inlet end of the anti-backflow feeding unit 4 is connected to the outlet end of the biomass co-firing unit 3. The anti-backflow feeding unit 4 is used to safely feed fuel into the boiler 100. It also includes an automatic co-firing management platform 5, which is connected to the biomass unloading unit 1, the biomass stacking and reclaiming unit 2, the biomass co-firing unit 3, and the anti-smoke backflow feeding unit 4 to control the entire system. The automatic co-firing management platform 5 is used to receive the load signal of the boiler 100 and the real-time fuel characteristic data of the biomass co-firing unit 3, and to send control commands to the biomass co-firing unit 3 according to the load signal and the real-time fuel characteristic data to adjust the feed rate. Specifically, biomass fuel is first received and initially allocated by biomass unloading unit 1, and then transferred to biomass stack-reclaim unit 2 for storage. When co-firing is required, biomass stack-reclaim unit 2 will take materials as needed and send them to biomass co-firing unit 3 for precise metering, detection and feeding. Finally, it is safely fed into boiler 100 for combustion through anti-backflow feeding unit 4. Moreover, the automatic co-firing management platform 5 will dynamically calculate and adjust the feeding amount by receiving real-time load signals from boiler 100 and fuel characteristic data fed back from biomass co-firing unit 3, realizing the linkage closed-loop control between biomass fuel co-firing process and boiler 100 operating conditions. This method can effectively solve the problem of traditional co-firing process relying on manual feeding, realize full-process automation from fuel entry to combustion in the furnace, and thus significantly improve co-firing efficiency and boiler 100 operating stability.

[0018] Based on the inventory information and fuel analysis data of the zoned biomass shed 21, the automatic co-firing management platform 5 sends instructions to the biomass stacking and reclaiming unit 2 to recommend and control the fully automatic grab bucket bridge crane 22 to grab specific types of fuel. Based on real-time control of the overall system, the automatic blending management platform 5 can also integrate the inventory information and fuel analysis data of the biomass sheds 21 in different zones, actively recommend the optimal blending fuel type, and directly send instructions to the fully automatic grab bucket bridge crane 22 to control it to grab specific types of fuel.

[0019] As one embodiment provided, such as Figure 1 The biomass unloading unit 1 includes an unloading platform 11, a uniform unloading auger 12 disposed below the unloading platform 11, and a first conveyor belt 13 disposed at the discharge end of the uniform unloading auger 12; an automatic sampling device 14 is disposed on the outside of the first conveyor belt 13, and the automatic sampling device 14 is used to collect the fuel conveyed by the first conveyor belt 13. Specifically, fuel is received by the unloading platform 11, and initially homogenized by the uniform unloading auger 12 to prevent fuel accumulation and blockage. It is then transported by the first conveyor belt 13. An automatic sampling device 14, located outside the first conveyor belt 13, automatically and randomly collects fuel samples during transport to provide samples for subsequent testing. At the end of the first conveyor belt 13 is a plow-type unloader 15 controlled by an automatic unloading control module 200. The plow-type unloader 15 is controlled by the automatic unloading control module 200 to automatically unload different types or batches of fuel conveyed by the first conveyor belt 13 into different predetermined areas of the partitioned biomass shed 21.

[0020] As one embodiment provided, such as 1, the biomass stacking and reclaiming unit 2 includes a partitioned biomass shed 21 and a fully automatic grab bucket bridge crane 22 erected above the partitioned biomass shed 21; the partitioned biomass shed 21 can physically isolate and store fuels with different characteristics, while the fully automatic grab bucket bridge crane 22 can automatically complete the stacking and reclaiming operations according to the specifications of the automatic blending management platform 5.

[0021] The biomass stacking and reclaiming unit 2 also includes an automatic fire-fighting device 23, which is installed in the partitioned biomass shed 21. The automatic fire-fighting device 23 can monitor the temperature and smoke parameters of the partitioned biomass shed 21 to prevent fires.

[0022] As one embodiment provided, such as Figure 1 The biomass co-firing unit 3 includes a receiving port 31 at the inlet end of the biomass co-firing unit 3, a uniform feeding device 32 disposed below the receiving port 31, a second conveyor belt 33 disposed below the discharge end of the uniform feeding device 32, and a material distribution device 34 disposed at the end of the second conveyor belt 33; the drive motor of the uniform feeding device 32 is electrically connected to the automatic co-firing management platform 5; an iron remover 35, a weighing and metering device 36, and an online calorific value monitoring device 37 are installed sequentially on the outside of the second conveyor belt 33 along the conveying direction of the second conveyor belt 33. Specifically, fuel enters through the receiving port 31 and is controlled stably and evenly by the uniform feeding device 32, and finally transported by the second conveyor belt 33. During the process of the fuel being transported by the second conveyor belt 33, the iron remover 35 can remove iron impurities from the fuel to protect downstream equipment. The weighing and metering device 36 measures the feed amount in real time to ensure the accuracy of the blending ratio. The online calorific value monitoring device 37 analyzes the calorific value of the fuel in real time and provides feedback signals for the control of the automatic blending management platform 5.

[0023] As one embodiment provided, such as Figure 1The anti-backflow feeding unit 4 includes an anti-backflow feeder 41 constituting the inlet end of the anti-backflow feeding unit 4, and a quick-closing valve 42 installed at the outlet end of the anti-backflow feeder 41. The output end of the quick-closing valve 42 is used to connect to the boiler 100. The anti-backflow feeder 41 is connected to a high-pressure blower 43 through an air duct. The high-pressure blower 43 provides sealing air pressure to the anti-backflow feeder 41 and forms a negative pressure at the inlet end of the anti-backflow feeder 41. Specifically, the high-pressure blower 43 provides sealing air pressure, which creates and maintains a stable negative pressure zone at the feed inlet of the anti-backflow feeder 41, thereby effectively preventing boiler flue gas from backflowing to the front end; while the quick-closing valve 42 can quickly disconnect the anti-backflow feeder 41 from the boiler 100 as needed.

[0024] In summary, after the biomass fuel is transported to the plant, it is first unloaded through the unloading platform 11. After initial homogenization by the uniform unloading auger 12, it falls onto the first conveyor belt 13. An automatic sampling device 14 collects samples for analysis. Under the control of the automatic unloading control module 200, the plow-type unloader 15 distributes the fuel to designated areas of the zoned biomass sheds 21 for classified stacking. The fully automatic grab bucket bridge crane 22, according to the instructions of the automatic blending management platform 5, picks up material from the zoned biomass sheds 21 and feeds it into the receiving port 31 of the biomass blending unit 3. After being stably fed by the uniform feeding device 32, the fuel falls onto the second conveyor belt 33, where it is sequentially removed by the iron separator 35, weighed in real-time by the weighing and metering device 36, and monitored by the online calorific value monitoring device 3. 7. After the calorific value is detected, the feed is distributed by the distribution device 34 to the anti-backflow feeder 41. Under the sealing air pressure provided by the high-pressure blower 43, the anti-backflow feeder 41 forms a negative pressure at the feed inlet, which, together with the quick-closing valve 42, prevents the flue gas from backflowing into the boiler 100, ensuring the safe delivery of fuel into the boiler 100. The automatic co-firing management platform 5 receives the load signal of the boiler 100 and the fuel characteristic data fed back by the online calorific value monitoring device 37 in real time, and dynamically adjusts the feeding amount of the uniform feeding device 32 to realize closed-loop control of the co-firing process and the boiler load. At the same time, based on the inventory and fuel data of the zoned biomass shed 21, it intelligently recommends and controls the fully automatic grab bucket bridge crane 22 to grab specific types of fuel, realizing fully automated, precise and intelligent operation. This effectively solves the problems of traditional co-firing processes that rely on manual labor, have extensive control and poor safety, and significantly improves co-firing efficiency, boiler operation stability and the level of refined fuel management.

[0025] Finally, it should be noted that the methods and devices described in detail above are merely embodiments, and those skilled in the art can modify these embodiments in different ways as long as they do not depart from the scope of the present invention.

Claims

1. A biomass co-firing power generation system, characterized in that: Along the fuel flow direction, it includes, Biomass unloading unit (1), the biomass unloading unit (1) is used to receive fuel and initially distribute the fuel; Biomass stacking and reclaiming unit (2), the inlet end of the biomass stacking and reclaiming unit (2) is connected to the outlet end of the biomass unloading unit (1), the biomass stacking and reclaiming unit (2) is used to stack fuel in sections and take fuel as needed; The biomass co-firing unit (3) is connected to the outlet end of the biomass stacking and reclaiming unit (2). The biomass co-firing unit (3) measures and detects the fuel taken for precise feeding. The inlet end of the anti-backflow feeding unit (4) is connected to the outlet end of the biomass co-firing unit (3). The anti-backflow feeding unit (4) is used to safely feed fuel into the boiler (100). It also includes an automatic co-firing management platform (5), which is connected to the biomass unloading unit (1), the biomass stacking and reclaiming unit (2), the biomass co-firing unit (3) and the anti-smoke backflow feeding unit (4) for controlling the entire system; The automatic co-firing management platform (5) is used to receive the load signal of the boiler (100) and the real-time fuel characteristic data of the biomass co-firing unit (3), and to issue control commands to the biomass co-firing unit (3) according to the load signal and the real-time fuel characteristic data to adjust the feed rate.

2. The biomass co-firing power generation system according to claim 1, characterized in that: The biomass unloading unit (1) includes an unloading platform (11), a uniform unloading auger (12) located below the unloading platform (11), and a first conveyor belt (13) located at the discharge end of the uniform unloading auger (12); an automatic sampling device (14) is provided on the outside of the first conveyor belt (13), and the automatic sampling device (14) is used to collect the fuel conveyed by the first conveyor belt (13).

3. The biomass co-firing power generation system according to claim 2, characterized in that: The end of the first conveyor belt (13) is provided with a plow-type unloader (15) controlled by an automatic unloading control module (200).

4. The biomass co-firing power generation system according to claim 3, characterized in that: The biomass stacking and reclaiming unit (2) includes a partitioned biomass shed (21) and a fully automatic grab bucket bridge crane (22) mounted on the partitioned biomass shed (21).

5. The biomass co-firing power generation system according to claim 4, characterized in that: The biomass stacking and reclaiming unit (2) also includes an automatic fire-fighting device (23), which is installed in the partitioned biomass shed (21).

6. The biomass co-firing power generation system according to claim 5, characterized in that: The biomass co-firing unit (3) includes a receiving port (31) forming the inlet end of the biomass co-firing unit (3), a uniform feeding device (32) disposed below the receiving port (31), a second conveyor belt (33) disposed below the discharge end of the uniform feeding device (32), and a material distribution device (34) disposed at the end of the second conveyor belt (33); the drive motor of the uniform feeding device (32) is electrically connected to the automatic co-firing management platform (5); along the conveying direction of the second conveyor belt (33), an iron remover (35), a weighing and metering device (36) and an online calorific value monitoring device (37) are installed sequentially on the outside of the second conveyor belt (33).

7. The biomass co-firing power generation system according to claim 6, characterized in that: The anti-backflow feeding unit (4) includes an anti-backflow feeder (41) constituting the inlet end of the anti-backflow feeding unit (4) and a quick-closing valve (42) provided at the outlet end of the anti-backflow feeder (41). The output end of the quick-closing valve (42) is used to connect to the boiler (100). The anti-backflow feeder (41) is connected to a high-pressure blower (43) through a duct. The high-pressure blower (43) provides sealing air pressure to the anti-backflow feeder (41) and forms a negative pressure at the inlet end of the anti-backflow feeder (41).

8. The biomass co-firing power generation system according to claim 7, characterized in that: The automatic blending management platform (5) sends instructions to the biomass stacking and reclaiming unit (2) based on the inventory information and fuel analysis data of the partitioned biomass shed (21), recommending and controlling the fully automatic grab bucket bridge crane (22) to grab specific types of fuel.

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