Biomass direct combustion-gasification synergistic combustion control system and method under oxygen-enriched condition

Abstract

The invention relates to the technical field of negative carbon emission, and discloses a biomass direct combustion-gasification collaborative combustion control system and method.The system comprises an intelligent fuel management and decision-making platform, a fuel distribution and conveying system, a fuel gasification system, a boiler combustion system, a purification system and a bed pressure and backflow flue gas distribution control system; biomass is distributed to the fuel gasification system and the boiler combustion system through the fuel distribution and conveying system, and the operation bed pressure and backflow smoke distribution control system is used for conducting distribution control over backflow primary / secondary air and conducting intelligent control and adjustment on operation bed pressure. Through three innovations of oxygen-enriched intensified combustion, direct combustion-gasification cooperation and intelligent prediction control, the core pain point of biomass direct combustion is systematically solved, multiple advantages of high efficiency, stability, low carbon and intelligence are achieved, a feasible path is provided for deep fusion of biomass energy and a carbon capture technology, and the method is suitable for popularization and application. The method is expected to become an important component of a future zero-carbon power system.

Description

Technical Field

[0001] The present invention relates to the field of negative carbon emission technology, and in particular to a biomass direct combustion-gasification coordinated combustion control system and method under oxygen-rich conditions. Background Art

[0002] Oxygen-enriched combustion is considered a highly effective, negative carbon emission technology. By enriching CO2 in flue gas, improving downstream capture efficiency and reducing capture costs, it has become one of the most promising new combustion technologies. Its basic principle is to extract a portion of the flue gas from the existing power plant boiler system and inject pure oxygen. The mixed gas acts as a combustion-supporting gas, replacing air, and is fed into the furnace to assist combustion. After combustion, the CO2 concentration in the flue gas can reach >80% on a dry basis, enabling low-cost CO2 capture and resource utilization.

[0003] So far, the research on oxygen-enriched combustion technology in the power sector has mainly focused on coal-fired boilers and has built a domestic 40MW th Demonstration projects have been conducted, but research on oxygen-enriched combustion and operational regulation mechanisms for biomass-fired boilers is relatively limited. In particular, for biomass boilers, due to the poor stability of biomass fuel, the operational control methods for direct-fired boilers are crude, and there is a lack of predictive and timely feedback regulation measures for changes in operating conditions. The direct consequences are poor boiler combustion stability, large fluctuations in operating parameters, and unstable steam parameters, which adversely affect turbine operation. The concentration of CO2 components in the flue gas fluctuates greatly, and this also leads to high energy consumption for fans (primary and secondary fans). Therefore, it is of great significance in the industry to develop a system and method that can achieve clean utilization of biomass, meet the requirements of stable boiler combustion, adaptive load regulation, improve operational efficiency and parameter stability, and reduce operational energy consumption. Summary of the Invention

[0004] The present invention aims to provide a biomass direct combustion-gasification coordinated combustion control system and method under oxygen-rich conditions to solve the problems of unstable boiler combustion, large parameter fluctuations, and high operating energy consumption caused by extensive regulation under direct biomass combustion.

[0005] To achieve the above-mentioned purpose, the present invention adopts the following technical solutions: a biomass direct combustion-gasification coordinated combustion control system under oxygen-rich conditions, including a fuel intelligent management and decision-making platform, a fuel distribution and delivery system, a fuel gasification system, a boiler combustion system, a purification system, and an operating bed pressure and return flue gas distribution control system. The fuel distribution and delivery system distributes biomass to the fuel gasification system and the boiler combustion system, and the operating bed pressure and return flue gas distribution control systems are used to control the return primary / secondary air distribution and intelligently control and adjust the operating bed pressure. Preferably, as an improvement, a biomass direct combustion-gasification coordinated combustion control method under oxygen-rich conditions is completed using a biomass direct combustion-gasification coordinated combustion control system, comprising the following steps: Step 1: preprocessing; Step 2: Construction of intelligent fuel management and decision-making platform; Step 3: Biomass Distribution: Biomass fuel is divided into two routes through the fuel distribution and delivery system, entering the fuel gasification system and boiler combustion system respectively. The fuel gasification system uses oxygen-enriched gasification. The boiler combustion system establishes an intelligent boiler balance system solution model with flue gas recirculation based on the principle of oxygen-enriched combustion, using the fuel intelligent management and decision-making platform and real-time fuel quantity data and gasification gas data. This model intelligently predicts combustion heat, oxygen demand, flue gas volume, and air supply. Step 4: The fuel after entering the fuel gasification system and the boiler combustion system enters the fluidized combustion boiler device for fluidization and circulating combustion; the flue gas after combustion is desulfurized, denitrified, dust-removed, and cooled by the flue gas purification / cooling system. Part of the flue gas is led back into the furnace to assist combustion. Pure oxygen needs to be injected into the reflux flue gas to create oxygen-rich conditions. Step 5. Intelligent control adjustment: Based on the historical data of the boiler SIS, the boiler operating bed pressure and the corresponding primary air volume are optimized and judged to determine the optimal operating bed pressure and primary air volume control target values under the direct-fired fuel load, taking into account the amount of fuel entering the furnace in real time; the bed pressure is precisely controlled by adjusting the operating frequency of the slag cooler through the intelligent module.

[0006] Preferably, as an improvement, in step one, the pretreatment includes drying, screening, and crushing the biomass raw material.

[0007] Preferably, as an improvement, in step 2, when the platform is constructed, the large image model of artificial intelligence technology is used to realize automatic identification and judgment of the biomass entering the furnace; a "standard fuel" library is established and key technical indicators are obtained, and the key technical indicators of the working fuel are compared with those of the "standard fuel".

[0008] Preferably, as an improvement, the key technical indicators include chemical analysis indicators, industrial analysis indicators, calorific value, unit theoretical oxygen demand, unit flue gas generation, and generation of each component.

[0009] Preferably, as an improvement, in step three, the fuel entering the fuel gasification system and the boiler combustion system is completed by using a conveying system, and an online weighing device is provided on the conveying system.

[0010] Preferably, as an improvement, in step three, the gasification medium of the fuel gasification system is pure oxygen or a mixture of flue gas and pure oxygen.

[0011] Preferably, as an improvement, in step three, the raw coal gas generated by the fuel gasification system is cooled, and the dust and tar in the raw coal gas are treated by a purification system, the purified raw coal gas is tested online, and the treated raw coal gas is sent to the boiler combustion system for coordinated combustion.

[0012] Preferably, as an improvement, in step 4, the amount of pure oxygen injected is completed by real-time flow metering feedback and valve meter opening adjustment instructions.

[0013] Preferably, as an improvement, in step 4, the introduction ratio of the reflux flue gas is 55-75%.

[0014] The principles and advantages of this solution are as follows: In practical application, this technical solution addresses the challenges of existing technologies by utilizing an oxygen-enriched combustion and gasification system. By injecting pure oxygen or oxygen-enriched flue gas (recirculated flue gas + pure oxygen), the oxygen concentration in the furnace is increased (above 21%), accelerating the combustion reaction rate and raising the combustion temperature while minimizing nitrogen dilution and reducing the total flue gas volume. The biomass is divided into two paths through the fuel distribution and delivery system: one portion enters the boiler directly for combustion (direct combustion), while the other portion undergoes oxygen-enriched gasification to generate raw coal gas (containing combustible gases such as CO, H2, and CH4). This is then co-combusted with the direct combustion fuel, creating a "solid fuel + gas fuel" composite combustion mode. This method combines the stable base heat provided by the direct combustion fuel with the high calorific value and rapid combustion rate of the gasified gas, enabling rapid response to load changes and achieving energy complementarity.

[0015] Furthermore, this technical solution innovatively incorporates intelligent control, leveraging data-driven decision-making. The intelligent fuel management platform uses a large AI image model to identify biomass types and match them against a library of "standard fuels" (including industrial analysis, calorific value, oxygen demand, and other indicators). This platform then calculates fuel property differences in real time to predict combustion requirements. Based on historical boiler data (from the SIS system), an intelligent "flue gas recirculation-bed pressure-air volume" solution model is established to dynamically predict parameters such as combustion heat, oxygen demand, and flue gas volume, guiding the adjustment of equipment such as fans, valves, and slag coolers. Furthermore, closed-loop control logic utilizes the following: ① Bed pressure control: Bed material load is adjusted by adjusting the slag cooler operating frequency, combined with optimization of primary air volume to maintain optimal bed pressure (which influences fluidization quality and combustion efficiency); ② Flue gas recirculation: 55%-75% of the purified flue gas is recirculated to the furnace, mixing with pure oxygen to create an oxygen-enriched environment. The recirculation ratio is then adjusted to control furnace temperature and CO2 concentration, providing a stable air source for carbon capture. Utilizing a multi-objective optimization algorithm, the system simultaneously optimizes combustion stability (bed pressure and temperature fluctuations ≤ 5%), energy efficiency (boiler efficiency increased by 1-2%), pollutant emissions (NOx and SO2 meeting standards), and carbon capture suitability (CO2 concentration stability). When the load changes, the system compensates for the combustion lag of direct-fired fuels by adjusting gasification gas production (response within seconds). Combined with fan variable frequency control (power consumption reduction of 15-35%), the "large lag and large overshoot" problems of traditional combustion systems are avoided.

[0016] During the technology research and development stage, the coordinated establishment of the heat-mass balance system of the boiler combustion system under oxygen-rich conditions; the control of oxygen injection into the circulating flue gas; and the establishment of an intelligent control algorithm model are the key points of this technology research and development. Through the exploration of the combustion mode, the R&D team first provides a stable basic heat through direct combustion of fuel, and then combines the advantage of gasification gas that can quickly respond to load changes to achieve energy complementarity and ensure the long-term, stable and efficient operation of the system.

[0017] The advantages of this technical solution are: 1. Process innovation: direct combustion, gasification and oxygen enrichment ternary synergy Breaking through the limitations of a single combustion model: Traditional biomass direct combustion relies on extensive fan air regulation, resulting in unstable combustion during load fluctuations. Pure gasification processes require high investment and complex gas purification. This solution achieves both stability and flexibility through a synergistic approach: direct combustion stabilizes baseload, gasification modulates peak load, and oxygen enrichment improves efficiency.

[0018] Coupling of oxygen enrichment and flue gas recirculation: Utilize the recirculated flue gas to recover sensible heat (reducing exhaust loss by 0.5-1.5%), while precisely controlling the oxygen concentration through pure oxygen injection to avoid thermal efficiency loss and NOx generation caused by nitrogen in traditional air combustion.

[0019] 2. Intelligent upgrade: from "passive adjustment" to "active prediction" Real-time perception of fuel characteristics: AI image large models replace manual testing, identifying biomass types (such as straw, wood chips, and rice husks) in seconds, matching with the "standard fuel" library, and correcting combustion control parameters in advance to resolve the regulation lag caused by fuel variability.

[0020] Multivariable intelligent solution: Establish a multivariable model including fuel quantity, gasification gas composition, bed pressure, air volume, and flue gas recirculation ratio. Through historical data training, realize "load-parameter" mapping, with a prediction error of ≤3%, reducing the frequency of manual intervention by more than 80%.

[0021] In summary, this technical solution systematically addresses the core pain points of biomass direct combustion through its triple innovations of "oxygen-enriched combustion, direct combustion-gasification synergy, and intelligent predictive control," combining the advantages of high efficiency, stability, low carbon emissions, and intelligence. Its core value lies not only in improving the operating performance of individual boilers but also in providing a viable path for the deep integration of biomass energy and carbon capture technologies, potentially becoming a key component of future zero-carbon power systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Picture 1 This is a flow chart of the biomass direct combustion-gasification coordinated combustion control system under oxygen-rich conditions in an embodiment of the present invention.

[0023] The figure marks in the drawings of the specification include: biomass silo 1, fuel intelligent management and decision-making platform 2, fuel distribution and transportation system 3, fuel gasification system 4, boiler combustion system 5, biomass fuel gasification furnace 6, raw coal gas waste heat recovery device 7, purification device 8, component and metering detection device 9, fluidized combustion boiler device 10, flue gas purification / cooling system 11, intelligent optimization unit 12, bed pressure intelligent adjustment unit 13, distribution control unit 14, and reflux flue gas buffer device 15. DETAILED DESCRIPTION

[0024] The following is further described in detail through specific embodiments, but the embodiments of the present invention are not limited thereto. Unless otherwise specified, the technical means used in the following embodiments are conventional means well known to those skilled in the art; the experimental methods used are all conventional methods; and the materials, reagents, etc. used are all commercially available.

[0025] Example The embodiment is basically as shown in the attached Picture 1As shown: A biomass direct combustion-gasification coordinated combustion control system under oxygen-rich conditions, including a pretreatment unit, a fuel intelligent management and decision-making platform 2, a fuel distribution and transportation system 3, a fuel gasification system 4, a boiler combustion system 5 and a purification system, wherein the purification system includes a raw gas purification device 8 and a flue gas purification / cooling system 11; in addition, it also includes an operating bed pressure and return flue gas distribution control system, which is used to control the return primary / secondary air distribution and intelligently control and adjust the operating bed pressure.

[0026] The pre-processing unit is used to perform pre-processing operations such as drying, screening and crushing on the biomass fuel, and after the processing is completed, it is put into the biomass silo 1 for standby use.

[0027] The intelligent fuel management and decision-making platform 2 establishes a "standard fuel" library with different fuel characteristics based on the large image model of artificial intelligence technology, and compares and calculates the basic indicators of the working condition fuel with the basic indicators of the "standard fuel", thereby realizing the prediction of combustion parameters (oxygen demand, flue gas volume).

[0028] The fuel distribution and delivery system 3 includes a screw machine and a belt conveyor. The belt conveyor is equipped with an online weighing device (existing technology) to accurately control the amount of direct combustion and gasification fuel.

[0029] The fuel gasification system 4 can generate raw coal gas from biomass under oxygen-rich conditions and purify it. The fuel gasification system 4 includes a biomass fuel gasifier 6, a raw coal gas waste heat recovery device 7, a purification device 8, and a component and metering detection device 9.

[0030] The boiler combustion system 5 includes a fluidized combustion boiler device 10 and a flue gas purification / cooling system 11. The fluidized combustion boiler device 10 integrates a flue gas reflux inlet and a pure oxygen injection device to achieve direct combustion and coordinated combustion of gasified gas.

[0031] The operating bed pressure and return gas distribution control system optimizes bed pressure control (slag cooler frequency) and primary / secondary air distribution (fan power optimization) based on historical data. It includes an intelligent optimization unit 12, an intelligent bed pressure adjustment unit 13, a distribution control unit 14, and a return gas buffer device 15.

[0032] A biomass direct combustion-gasification coordinated combustion control method under oxygen-rich conditions comprises the following steps: Step 1: Pretreatment: The biomass is dried, screened, and crushed in the pretreatment unit and then enters the biomass silo 1; Step 2. Build an intelligent management and decision-making platform for biomass fuel 2: Based on the large-scale image model of artificial intelligence technology, realize the automatic identification and judgment of biomass entering the furnace; establish a fuel management database, classify and count the types of operating fuels and detection indicators that have been adopted by power plants in recent years, and mark the amount of fuel data as much as possible; select one or more main fuels in the statistical fuel library, configure them to form a "standard fuel", obtain the key technical indicators of the "standard fuel" (chemical analysis indicators, industrial analysis indicators, calorific value, unit theoretical oxygen demand, unit flue gas generation, each component generation, etc.) to establish a fuel basic data set; compare and calculate the basic indicators of the operating fuel with the basic indicators of the "standard fuel", use the coefficient method to assign the corresponding correction coefficient to each operating fuel and preset it in the intelligent platform. The preset value can also be manually fine-tuned in combination with the operating conditions, such as the theoretical oxygen demand per unit mass of the operating fuel is ki·V 0 O2 The theoretical flue gas generation is ni·V 0 exh , ki, ni is the coefficient; among them, ki The value range is 0.95-1.8, ni The value range is 0.9-1.7.

[0033] Step 3: Direct combustion-gasification fuel distribution: The biomass fuel in the biomass silo 1 is divided into two paths through the fuel distribution and transportation system 3, entering the fuel gasification system 4 (gasification) and the boiler combustion system 5 (direct combustion) respectively. The fuel must be transported by means of screw conveyors, belts, etc. The transportation system is equipped with a fuel online weighing device, and real-time weighing data is generated when the fuel passes through the weighing point.

[0034] It should be noted that working fuel usually contains a certain amount of mud and other debris, and the actual weight should be deducted from the weighing weight by a coefficient. The selection of this coefficient is based on a comprehensive determination of two factors: one is the test data of fuel in the same period in history; the other is the judgment of the current fuel status with manual assistance. The value range of this coefficient is 1-30%.

[0035] Step 4: The biomass entering the fuel gasification system 4 is distributed and controlled based on the maximum design load of the gasifier. The time interval from the fuel weighing point to the gasifier furnace is set to t time1 The biomass combustion gasification furnace adopts oxygen-enriched gasification. The gasification medium can be pure oxygen or flue gas + pure oxygen. After gasification, the biomass solid fuel is converted into gaseous fuel, and the gaseous components are mainly CO, H2, and CH4.

[0036] Step 5: Treatment of raw gas: The raw gas coming out of the biomass combustion gasification furnace is at a high temperature and needs to be cooled. A waste heat recovery device is set up to recover the waste heat. The cooling medium is boiler feed water and combustion-supporting gas entering the furnace.

[0037] The dust and tar in the raw gas are processed by the raw gas purification device 8 in the purification system, and the component and metering detection device 9 is set to realize online measurement of the purified raw gas. The processed raw gas is sent to the direct-fired boiler through the fan power equipment for coordinated combustion.

[0038] Step 6: The time interval for transporting the biomass fuel from the weighing point to the fluidized combustion boiler device 10 into the boiler combustion system 5 is t time2 (Note that under normal circumstances, the operating frequency of the conveying system is constant), the combustion load change of the fluidized combustion boiler device 10 and the related control process, equipment adjustment time and fuel weighing point have t time2 Based on the time interval, the trend relationship between the corresponding parameters is established, such as air supply volume~supply fan frequency, flue gas volume~induced draft fan frequency, fuel volume~oxygen injection volume, etc., which provides a basis for intelligent adjustment of system operation.

[0039] Step 7. Based on the intelligent fuel management and decision-making platform 2 and real-time fuel quantity data and gasification gas data, and on the principle of oxygen-enriched combustion, an intelligent solution model of the boiler balance system with flue gas recirculation is established (a solution model established based on the material and thermodynamic balance relationship for the boiler combustion and flue gas process system under the coupling of gasification and oxygen-enriched conditions). This model enables intelligent prediction of various parameters of the boiler system under oxygen-enriched combustion conditions. The main prediction data include combustion heat, oxygen demand, flue gas volume, and air supply volume.

[0040] Step 8. After entering the fuel gasification system 4 and the boiler combustion system 5, the fuel enters the fluidized combustion boiler device 10 for fluidization and circulating combustion. The flue gas after combustion is desulfurized, denitrified, dust-removed and cooled by the flue gas purification / cooling system. Part of the flue gas is drawn out and refluxed into the furnace to assist combustion. Pure oxygen needs to be injected into the reflux flue gas to form oxygen-rich conditions, and the pure oxygen is provided by the pure oxygen supply system.

[0041] Both the flue gas reflow distribution and flue gas oxygen injection are controlled by the intelligent decision-making module of the fuel intelligent management and decision-making platform 2. The relevant control instructions are completed by the corresponding execution equipment. For example, the oxygen injection amount is controlled by real-time flow metering feedback and valve meter opening adjustment instructions. The reflow flue gas is completed by intelligently adjusting the fan frequency, valve opening and baffle. During this process, the reflow flue gas extraction ratio is between 55-75%.

[0042] Step 9. Intelligent control adjustment: Based on the historical data of the boiler SIS, the boiler operating bed pressure and the corresponding primary air volume are optimized and judged, and the optimal operating bed pressure and primary air volume control target values under the direct-fired fuel load are determined, taking into account the amount of fuel entering the furnace in real time. Based on these two factors, the operating frequency of the slag cooler is adjusted through the intelligent module to accurately control the bed pressure to ensure that the bed pressure and fluidization are in the optimal state.

[0043] Step 10: The gasification gas enters the boiler and co-combusts with the direct-fired fuel, reducing the boiler's fluidizing air volume requirements and control difficulty, while improving combustion stability within the furnace. The specific process is as follows: The gasification gas, a medium-to-high calorific value combustible gas, is directly fed into the furnace. The oxygen-rich atmosphere, combustion-supporting gas, blows the direct-fired fuel from the bottom of the wind chamber, fluidizing and pre-combusting it. All fuels are then fully and completely combusted by the secondary air.

[0044] Step 11: The recirculating flue gas buffer device 15 regulates the primary / secondary air distribution control through an intelligent module. It intelligently matches the primary air supply based on the optimized bed pressure. When the total air supply is met, the remaining flue gas is allocated as secondary air. Primary air primarily serves to lift the fuel, fluidize it, and pre-combust it, while secondary air enhances combustion and ensures complete burnout.

[0045] By adopting the biomass direct combustion-gasification coordinated combustion control system and method under oxygen-rich conditions of this embodiment, the overall fuel utilization rate is improved, the boiler exhaust loss can be reduced by 0.5-1.5%, the mechanical incomplete loss is zero, the boiler efficiency is increased by 1-2%, and the total power consumption of the fan is reduced by 15-35%.

[0046] The above is only an embodiment of the present invention, and the common knowledge such as the specific technical solutions and / or characteristics in the solution are not described in detail here. It should be pointed out that for those skilled in the art, without departing from the technical solution of the present invention, several variations and improvements can be made, which should also be regarded as the scope of protection of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the description can be used to interpret the content of the claims.

Claims

1. A biomass direct combustion-gasification coordinated combustion control system under oxygen-rich conditions, characterized by: It includes a fuel intelligent management and decision-making platform, a fuel distribution and delivery system, a fuel gasification system, a boiler combustion system, a purification system, a bed pressure and return flue gas distribution control system. The fuel distribution and delivery system distributes biomass to the fuel gasification system and the boiler combustion system respectively. The operating bed pressure and return flue gas distribution control system is used to control the return primary / secondary air distribution and intelligently control and adjust the operating bed pressure.

2. The biomass direct combustion-gasification coordinated combustion control method under oxygen-rich conditions according to claim 1 is characterized in that: The biomass direct combustion-gasification coordinated combustion control system is used, which includes the following steps: Step 1: preprocessing; Step 2: Construction of intelligent fuel management and decision-making platform; Step 3: Biomass Distribution: Biomass fuel is divided into two routes through the fuel distribution and delivery system, entering the fuel gasification system and boiler combustion system respectively. The fuel gasification system uses oxygen-enriched gasification. The boiler combustion system establishes an intelligent boiler balance system solution model with flue gas recirculation based on the principle of oxygen-enriched combustion, using the fuel intelligent management and decision-making platform and real-time fuel quantity data and gasification gas data. This model intelligently predicts combustion heat, oxygen demand, flue gas volume, and air supply. Step 4: The fuel after entering the fuel gasification system and the boiler combustion system enters the fluidized combustion boiler device for fluidization and circulating combustion; the flue gas after combustion is desulfurized, denitrified, dust-removed, and cooled by the flue gas purification / cooling system. Part of the flue gas is led back into the furnace to assist combustion. Pure oxygen needs to be injected into the reflux flue gas to create oxygen-rich conditions. Step 5. Intelligent control adjustment: Based on the historical data of the boiler SIS, the boiler operating bed pressure and the corresponding primary air volume are optimized and judged to determine the optimal operating bed pressure and primary air volume control target values under the direct-fired fuel load, taking into account the amount of fuel entering the furnace in real time; the bed pressure is precisely controlled by adjusting the operating frequency of the slag cooler through the intelligent module.

3. The biomass direct combustion-gasification coordinated combustion control method under oxygen-rich conditions according to claim 2, characterized in that: In step one, pretreatment includes drying, screening, and crushing of the biomass raw materials.

4. The biomass direct combustion-gasification coordinated combustion control method under oxygen-rich conditions according to claim 3, characterized in that: In step 2, when the platform is built, the large-scale image model of artificial intelligence technology is used to realize the automatic identification and judgment of the biomass entering the furnace; a "standard fuel" library is established and key technical indicators are obtained, and the key technical indicators of the working fuel are compared with those of the "standard fuel".

5. The biomass direct combustion-gasification coordinated combustion control method under oxygen-rich conditions according to claim 4, characterized in that: The key technical indicators include chemical analysis indicators, industrial analysis indicators, calorific value, unit theoretical oxygen demand, unit flue gas generation, and generation of each component.

6. The biomass direct combustion-gasification coordinated combustion control method under oxygen-rich conditions according to claim 5, characterized in that: In step three, the fuel entering the fuel gasification system and the boiler combustion system is completed using a conveying system, and an online weighing device is provided on the conveying system.

7. The biomass direct combustion-gasification coordinated combustion control system and method under oxygen-rich conditions according to claim 6 is characterized in that: In step three, the gasification medium of the fuel gasification system is pure oxygen or a mixture of flue gas and pure oxygen.

8. The biomass direct combustion-gasification coordinated combustion control method under oxygen-rich conditions according to claim 7, characterized in that: In step three, the raw gas generated by the fuel gasification system is cooled, and the dust and tar in the raw gas are treated by a purification system. The purified raw gas is tested online and sent to the boiler combustion system for coordinated combustion.

9. The biomass direct combustion-gasification coordinated combustion control method under oxygen-rich conditions according to claim 8, characterized in that: In step 4, the amount of pure oxygen injected is completed through real-time flow metering feedback and valve meter opening adjustment instructions.

10. The biomass direct combustion-gasification coordinated combustion control method under oxygen-rich conditions according to claim 9, characterized in that: In step 4, the ratio of introduction of reflux flue gas is 55-75%.

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