Low-carbon fuel blending coupling combustion test equipment and method

Abstract

The invention provides low-carbon fuel blending coupling combustion test equipment and method, and the equipment comprises a blending fuel feeding system which is used for blending solid-phase, liquid-phase and gas-phase low-carbon fuels with fossil solid fuels or other solid fuels in proportion; the one-dimensional combustion furnace is used for coupling combustion of the blended fuel; the flue gas treatment system is used for carrying out cooling, dust removal, desulfurization, denitration and carbon dioxide adsorption and trapping treatment on flue gas generated by coupling combustion; the control cabinet is used for controlling the stable and safe operation of the whole experiment platform; the low-carbon coupling combustion test system and method and the coupling combustion low-carbon technology have the beneficial effects that the coupling combustion condition that the actual boiler is internally mixed with low-carbon fuel is simulated by adopting a feeding and conveying mode of accurately controlling the blending combustion proportion, and the low-carbon coupling combustion test system and method and the coupling combustion low-carbon technology are formed; the device has multiple innovative functions of controlling the blending combustion ratio, efficiently coupling combustion, comprehensively purifying flue gas, adsorbing and trapping carbon dioxide, saving energy, reducing carbon and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of fuel blending and coupled combustion, and in particular to a low-carbon fuel blending and coupled combustion test device and method. Background Art

[0002] At present, the pyrolysis and combustion characteristic experimental equipment for many single types of fuels cannot meet the development needs of coupled combustion technology. Most of the existing experimental equipment can only conduct combustion experiments on single fuels and lack a treatment system for flue gas carbon dioxide and the like after combustion, and cannot simulate the coupled combustion characteristics and emission characteristics of low-carbon fuels under different blending ratios.

[0003] For example, the invention patent with the authorization publication number CN106885234A discloses a combustion test furnace, including: a one-dimensional combustion test furnace system and a sealing system, which can accurately simulate the real atmospheric environment under different altitudes in the laboratory, facilitating the development of pulverized coal combustion characteristic tests under different atmospheric environments; its remarkable feature is to simulate the pulverized coal combustion characteristics under the corresponding air pressure environment at different altitudes in the furnace. Also, the utility model patent with the authorization publication number CN213456807U discloses a test platform for co-firing solid waste and pulverized coal, including a one-dimensional flame furnace system, a solid waste carbonization and pyrolysis system, and a measurement system; its remarkable feature is to conduct a co-firing test of the pyrolysis gas obtained by carbonizing and pyrolyzing solid waste and pulverized coal, which can only conduct co-firing of gas phase and solid phase pulverized coal, and does not mention how to control the blending ratio. Again, the invention patent with the authorization publication number CN114264155A discloses a multi-functional one-dimensional furnace device, including a gas source and a gas station. One end of the gas station is connected to the gas source, and the other end is connected to a gas heater. The gas heater is sequentially connected with a solid fuel bin, a burner, and a furnace body in the gas source flow direction. A control cabinet is also provided at the rear end of the furnace body as an integrated control device for all equipment, etc.; its remarkable feature is to pyrolyze and gasify different solid fuels to realize the testing and experiments that can meet the combustion characteristics of multiple fuels. In fact, it is the combustion of a single type of fuel, without the coupled combustion after the blending of different solid, liquid, or gas phase fuels. Summary of the Invention

[0004] To overcome the above problems existing in the prior art, the present invention provides a low-carbon fuel blending and coupled combustion test device and method, which is used to carry out experimental studies on the coupled combustion characteristics, removal of coupled combustion pollutants, coupled combustion under oxygen enrichment, carbon dioxide capture and adsorption in the coupled combustion flue gas recirculation, etc. of solid-phase, liquid-phase, and gas-phase low-carbon fuels and solid fuels with different blending ratios, and can also carry out the test research on the coupled combustion efficiency.

[0005] The present invention discloses a low-carbon fuel blending and coupling combustion test device, including a blended fuel feeding system for blending solid-phase, liquid-phase, and gas-phase low-carbon fuels with fossil solid fuels or other solid fuels in proportion; a one-dimensional combustion furnace for the coupling combustion of the blended fuel; a flue gas treatment system for cooling, dust removal, desulfurization, denitrification, and carbon dioxide adsorption and capture of the flue gas generated by the coupling combustion; and a measurement and control system for real-time collection of system operation data and automatic regulation and safety protection.

[0006] On this basis, the blended fuel feeding system includes an air supply system, a fuel blending and conveying system, and a coupling combustion system. The air supply system is divided into a primary air system and a secondary air system. The primary air system includes a high-pressure blower, an air volume control valve, an air volume measuring instrument, a pipeline heater, a pulverized coal-air mixer, and a coupling burner. The secondary air system includes a high-pressure blower, an air volume control valve, an air volume measuring instrument, a pipeline heater, and a coupling burner. The fuel blending and conveying system includes a pulverized coal feeder, a low-carbon fuel feeder, and a fuel flow control valve. The coupling combustion system uses a coupling burner, and the coupling burner is connected to the one-dimensional combustion furnace.

[0007] On this basis, the coupling burner is a dual-purpose burner capable of burning gas-phase and solid-phase (liquid-phase) low-carbon fuels. The coupling burner consists of two concentric tubes from the inside to the outside, which are the primary air passage and the secondary air passage in sequence. The primary air passage is vertically connected to the gas fuel passage, and the gas fuel passage is connected to the gas fuel connection port. A swirler is installed at the outlet of the secondary air passage.

[0008] On this basis, the one-dimensional combustion furnace includes a main combustion zone, a burnout zone, and a slag discharge section. A fuel inlet is provided at the middle position above the main combustion zone. An ultraviolet flame detector is provided on the side of the main combustion zone. The ultraviolet flame detector is equipped with a purging device. The purging device includes an air compressor and a gas storage tank connected in sequence. Inductive heaters and flame observation windows are provided in the main combustion zone and the burnout zone. A multi-functional interface is provided in the burnout zone. A water seal funnel is provided below the slag discharge section.

[0009] On this basis, the measurement and control system includes: a control cabinet for operators to control the switches of various devices and monitor various parameters in the system; a real-time data acquisition system for collecting parameters such as furnace body temperature, pressure, air volume, gas flow rate, and flue gas temperature, and storing them in the form of trend charts and historical data; a safety protection system for monitoring the safe operation of the system through the master fuel trip system (MFT). When situations such as fan trip, excessive furnace negative pressure, or flameout occur, the main fuel is automatically cut off and an alarm is given; an automatic regulation system for automatically regulating the furnace negative pressure and the powder feeding amount to ensure the stable operation of the system during the experiment.

[0010] On this basis, the flue gas treatment system includes a tail flue gas diversion and ash collection furnace body, a flue gas cooler, a bag filter, a desulfurization and denitrification device, a carbon dioxide adsorption device and a induced draft fan connected in sequence, and flue gas sampling ports are arranged on the desulfurization and denitrification device and the carbon dioxide adsorption device.

[0011] On this basis, the flue gas treatment system further includes a flue gas water washing tank, and the flue gas water washing tank is arranged below the slag discharge section.

[0012] On this basis, thermocouples are arranged at both the inlet and outlet of the water circulation loop inside the flue gas cooler for monitoring the water temperature at the inlet and outlet, and two ash cleaning ports for discharging ash and slag are arranged at the bottom of the flue gas cooler.

[0013] On this basis, the control cabinet includes a flow measurement device, a pressure measurement device, a temperature measurement device, an oxygen content measurement device and a distributed control system for real-time controlling the operating parameters of the system.

[0014] A method for low-carbon coupled combustion test includes the following steps:

[0015] Step 1: Fuel preparation, grinding coal and biomass into powders, and respectively putting them into a pulverized coal feeder and a biomass feeder, and setting the feeding amount to control the blending ratio;

[0016] Step 2: Fuel blending, mixing primary air and secondary air with the fuel through a high-pressure blower, a pipeline heater and a pulverized coal-air mixer, and then sending them into the coupled burner;

[0017] Step 3: Coupled combustion, the fuel undergoes a combustion reaction in the furnace body, and the generated flue gas and furnace slag respectively enter the flue gas treatment system and the slag discharge section;

[0018] Step 4: Flue gas treatment, after the flue gas is cooled, dust-removed, desulfurized, denitrified and carbon dioxide is adsorbed, it is discharged into the atmosphere through an induced draft fan.

[0019] Compared with the prior art, the beneficial effects of the present invention are: the present invention adopts a feeding and transportation method for precisely controlling the blending ratio, simulates the coupled combustion situation of mixing low-carbon fuels inside an actual boiler, and forms a low-carbon coupled combustion test system, method and coupled combustion low-carbon technology, which has multiple innovative functions such as controlling the blending ratio, high-efficiency coupled combustion, comprehensive flue gas purification, carbon dioxide adsorption and capture, energy conservation and carbon reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic structural diagram of the low-carbon fuel blending coupled combustion test equipment of the present invention;

[0021] Figure 2 is a schematic structural diagram of the one-dimensional combustion furnace of the present invention;

[0022] Figure 3 It is a schematic structural diagram of the coupling burner of the present invention;

[0023] In the figure: 1. High-pressure blower, 2. Air volume control valve, 3. Air volume measuring instrument, 4. Pipeline heater, 5. Pulverized coal feeder, 6. Low-carbon fuel feeder, 7. Fuel flow control valve, 8. Air-powder mixer, 9. Gas fuel connection port, 10. Coupling burner, 11. One-dimensional combustion furnace, 12. Tail gas turning and ash collection furnace body, 13. Water seal funnel, 14. Flue gas water washing tank, 15. Flue gas cooler, 16. Bag filter, 17. Flue gas sampling port, 18. Desulfurization and denitrification device, 19. Carbon dioxide adsorption device, 20. Induced draft fan, 21. Control cabinet, 10-1. Primary air passage, 10-2. Secondary air passage, 10-3. Gas fuel passage, 10-4. Swirl vane, 11-1. Main combustion zone, 11-2. Burnout zone, 11-3. Slag discharge section, 11-4. Fuel inlet, 11-5. Inductive heater, 11-6. Flame observation window, 11-7. Ultraviolet flame detector, 11-8. Air compressor, 11-9. Air storage tank, 11-10. Multi-functional interface. Specific embodiments

[0024] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0025] The present invention discloses a low-carbon fuel blending coupling combustion test device. Referring to Figure 1 , it includes a blended fuel feeding system for blending solid-phase, liquid-phase, and gas-phase low-carbon fuels with fossil solid fuels or other solid fuels in proportion; a one-dimensional combustion furnace 11 for the coupling combustion of the blended fuel; a flue gas treatment system for cooling, dust removal, desulfurization, denitrification, and carbon dioxide adsorption and capture of the flue gas generated by the coupling combustion; and a measurement and control system for real-time collection of system operation data and automatic regulation and safety protection.

[0026] The blended fuel feeding system includes an air supply system, a fuel blending and conveying system, and a coupling combustion system. The air supply system is divided into a primary air system and a secondary air system. The primary air system includes a high-pressure blower 1, an air volume control valve 2, an air volume measuring instrument 3, a pipeline heater 4, an air-powder mixer 8, and a coupling burner 10. The secondary air system includes a high-pressure blower 1, an air volume control valve 2, an air volume measuring instrument 3, a pipeline heater 4, and a coupling burner 10; during operation, the power of the pipeline heater 4 and the opening and closing of the air volume control valve 2 can be adjusted according to the combustion situation to adjust the temperature and flow rate of the primary air and the secondary air.

[0027] To reduce the loss of solid fuel during transportation, the outlet of the air-powder mixer 8 in the primary air system is connected to the coupling burner 10 through a metal bellows. The fuel blending and transportation system includes a pulverized coal feeder 5, a low-carbon fuel feeder 6, and a fuel flow control valve 7. The coupling combustion system uses the coupling burner 10, and the coupling burner 10 is connected to a one-dimensional combustion furnace 11.

[0028] Reference Figure 3 , the coupling burner 10 is a dual-purpose burner that can burn gaseous and solid (liquid) low-carbon fuels. The coupling burner 10 consists of two concentric tubes from the inside to the outside, namely the primary air passage 10-1 and the secondary air passage 10-2 in sequence. The primary air passage 10-1 is vertically connected to the gas fuel passage 10-3, and the gas fuel passage 10-3 is connected to the gas fuel connection port 9. A swirler 10-4 is installed at the outlet of the secondary air passage 10-2. The purpose is to make the primary air and the secondary air form a swirl in the outlet area of the coupling burner 10, enhance the backmixing effect of the flue gas, improve the heating effect of the fuel at the outlet of the coupling burner 10, and at the same time achieve the rapid mixing of the fuel and the high-temperature combustion-supporting air.

[0029] Reference Figure 2 , the one-dimensional combustion furnace 11 includes a main combustion zone 11-1, a burnout zone 11-2, and a slag discharge section 11-3. The design adopts a segmented design. Through a special upper and lower sleeve design inside the furnace body, the inner furnace tube can expand up and down bidirectionally in each section. The main part of each section of the furnace body consists of a recrystallized silicon carbide furnace tube at the innermost side, a refractory castable in the middle, a calcium silicate insulation board, a steel furnace shell, and an airtight structure. The steel furnace shell is wrapped with heat-insulating cotton, and the outermost side is aluminum skin to ensure that the temperature on the outermost side of the furnace body will not be too high. The rated combustion power of the one-dimensional combustion furnace 11 is 20 kw, the total height of the furnace body is 2.2 m, the inner diameter of the upper furnace section is 200 mm, the inner diameter of the lower furnace section is 150 mm, and the outer diameter of the shell is 600 mm; the maximum operating temperature reaches 1600 °C, which can meet the tests of most fuels. A fuel inlet 11-4 is arranged at the middle position above the main combustion zone 11-1, and an ultraviolet flame detector 11-7 is arranged on the side of the main combustion zone 11-1. The ultraviolet flame detector 11-7 is equipped with a purging device. The purging device includes an air compressor 11-8 and a gas storage tank 11-9 connected in sequence. The probe of the ultraviolet flame detector 11-7 is purged regularly to prevent blockage and slagging from affecting the normal operation of the ultraviolet detector. An inductive heater 11-5 and a flame observation window 11-6 are arranged in the main combustion zone 11-1 and the burnout zone 11-2. The flame observation window 11-6 is strip-shaped with quartz glass. A multi-functional interface 11-10 is arranged in the burnout zone 11-2, which can be used as a temperature measurement port, a gas sampling port, and a high-temperature dust sampling port. All the openings are sealed with flanges. There are openings on both sides of the furnace body tube. One side is a temperature measurement port where a thermocouple is installed, and the other side is a gas sampling port.

[0030] A water seal hopper 13 and a flue gas water scrubbing tank 14 are arranged below the slag discharge section 11-3. The water seal hopper 13 is used to maintain good sealing performance inside the furnace. After the excessive high-temperature ashes in the slag discharge section 11-3 fall, they can be cooled in the flue gas water scrubbing tank 14 without damaging the ground. The function of the flue gas water scrubbing tank 14 is to seal the internal space of the combustion chamber, preliminarily reduce the flue gas temperature, cool down and collect the ash. Some of its functions belong to the flue gas treatment system, so it can also be regarded as a part of the flue gas treatment system.

[0031] 40%-70% of the total air volume is taken from the outlet of the high-pressure blower 1 as the primary air. After being heated by the pipeline heater 4, it passes through the outlets of the pulverized coal feeder 5 and the low-carbon fuel feeder 6, and is fully mixed through the air-powder mixer 8, and then is connected to the primary air passage 10-1 of the coupling burner 10 at the upper end of the one-dimensional combustion furnace 11 through a metal bellows. 30%-60% of the total air volume is taken from the outlet of the high-pressure blower 1 as the secondary air. After being heated by the pipeline heater 4, it is directly introduced into the secondary air passage 10-2 of the coupling burner 10. At the same time, 0%-40% of the reheated air is introduced into the multi-functional interface 11-10 at the lower half of the one-dimensional combustion furnace 11.

[0032] The measurement and control system includes a control cabinet 21. The control cabinet 21 includes a flow measurement device, a pressure measurement device, a temperature measurement device, an oxygen content measurement device and a distributed control system, which are used to control the operating parameters of the system in real time; a real-time data acquisition system, which is used to collect parameters such as the temperature, pressure, air volume, gas flow rate, and flue gas temperature of the furnace body, and save them in the form of trend charts and historical data; the safety protection system monitors the safe operation status of the system in real time. It mainly ensures the safe and reliable operation of the whole system through the Main Fuel Trip (MFT). When situations such as fan trip, excessive furnace negative pressure, and fire extinguishing occur, the main fuel is automatically cut off and an alarm is given. At the same time, there are protection mechanisms such as a flue gas temperature monitoring circuit at the inlet of the bag filter 16 to prevent the bag temperature from being too high, an air volume monitoring circuit to prevent blockage of the primary air and secondary air pipelines, and an electric heater monitoring circuit to prevent the temperature from being too high. The automatic regulation system can automatically adjust several main operating parameters and automatically eliminate various disturbances, so as to ensure that the whole multi-functional one-dimensional combustion furnace 11 system is in a steady-state operation. The automatic regulation loop has a furnace negative pressure regulation loop and a coal feeder control loop. The negative pressure balance point of the furnace negative pressure regulation loop is set at the outlet of the turning flue of the one-dimensional furnace. The furnace negative pressure is controlled by adjusting the opening of the inlet valve of the induced draft fan 20; the coal feeder control loop automatically adjusts the mixing fuel coal feeder ratio and the total coal feeder amount after mixing to be stable according to the set load, ensuring that the mixing ratio, total coal feeder amount and combustion load of the one-dimensional furnace coupling combustion system are kept within the stable value range during the experiment.

[0033] The flue gas treatment system includes all the equipment and detection instruments from the bottom outlet of the one-dimensional combustion furnace 11 to the flue gas discharge outlet to the atmosphere. The flue gas treatment system includes a tail flue gas diversion and ash collection furnace body 12, a flue gas cooler 15, a bag filter 16, a desulfurization and denitrification device 18, a carbon dioxide adsorption device 19, a induced draft fan 20 connected in sequence, and pipelines connecting each equipment. There are flue gas sampling ports 17 provided on the desulfurization and denitrification device 18 and the carbon dioxide adsorption device 19.

[0034] The base of the one-dimensional combustion furnace 11 serves as the furnace flue gas outlet. After the flue gas turns, it enters the flue gas cooler 15. After cooling, the temperature drops to 200°C. The re-crystallized silicon carbide is also used in the diversion flue, and the flue shell is insulated with aluminum silicate fiber felt. The tail flue gas diversion and ash collection furnace body 12 at the bottom of the one-dimensional combustion furnace 11 is connected to the flue gas cooler 15. Thermocouples are provided at both the inlet and outlet of the water circulation loop inside the flue gas cooler 15 to monitor the water temperature at the inlet and outlet. Two ash cleaning ports for discharging ash slag are arranged at the bottom of the flue gas cooler 15. The flue gas cooler 15 can cool the flue gas temperature below 200°C, and the cooling water is taken from tap water; the cooling water consumption is about 0.6t / h.

[0035] A method for low-carbon coupled combustion test includes the following steps:

[0036] Step 4: Flue gas treatment. After the flue gas is cooled, dust removed, desulfurized, denitrified and carbon dioxide adsorbed, it is discharged into the atmosphere through the induced draft fan 20.

[0037] Preparation of biomass fuel and pulverized coal: Grind the prepared low-carbon fuels such as coal and biomass into powders, and put them into the pulverized coal feeder 5 and the biomass and other low-carbon fuel feeders 6 respectively. Set the feeding amounts of the pulverized coal feeder 5 and the biomass low-carbon fuel feeder 6 to control the blending ratio.

[0038] Blending of biomass and pulverized coal: According to the experimental requirements, set the flow rates and temperatures of the primary air and the secondary air. Take a part of the air from the outlet of the high-pressure blower 1 as the primary air. After being heated by the pipeline heater 4, it passes through the outlets of the pulverized coal feeder 5 and the biomass and other low-carbon fuel feeders 6, and is fully mixed through the air-powder mixer 8 and then connected to the primary air interface of the coupled burner 10 at the upper end of the one-dimensional combustion furnace 11 through a metal bellows. Take another part of the air from the outlet of the high-pressure blower 1 as the secondary air. After being heated by the pipeline heater 4, it is directly introduced into the secondary air inlet of the coupled burner. At the same time, a part of the heated air can also be diverted and introduced into the inlet of the multi-functional interface 11-10 in the lower half of the one-dimensional combustion furnace 11.

[0039] Coupled combustion of biomass and pulverized coal: After the blended fuel in the primary air passes through the coupled burner 10 of the one-dimensional combustion furnace 11, it enters the furnace tube inside the one-dimensional combustion furnace 11 for the main combustion reaction, flow, and heat transfer. The blended fuel generates flue gas and slag after coupled combustion. The flue gas and slag reach the tail flue gas diversion and ash collection furnace body 12. After the flue gas is purified by the flue gas treatment system, the clean tail gas is discharged into the atmosphere; the slag falls into the sampling port at the tail flue gas diversion and ash collection furnace body 12, where the slag can be sampled for analysis. Among them, the high-pressure blower 1, the pipeline heater 4, the pulverized coal feeder 5, the low-carbon fuel feeder 6, and the gas fuel inlet 9 are the basic control centers of the entire experiment. By changing the primary air flow rate, secondary air flow rate, the feeding amount of low-carbon fuels such as biomass, the feeding amount of solid fuels such as pulverized coal, and the gas fuel flow rate, etc., the coupled combustion characteristics of various fuels in the boiler are simulated; the pipeline heater 4 can simulate the functions of the air preheater and the waste heat recovery and utilization function; the experimental environment and combustion conditions of this experiment can be close to the actual situation of multi-fuel coupled combustion in large boilers.

[0040] Coupled combustion control and data acquisition: The one-dimensional combustion furnace 11 is the pyrolysis and coupled combustion device for the blended fuel in the entire experiment. It adopts a segmented design and is divided into upper and lower furnace bodies. Its functional areas are divided into the main combustion zone 11-1, the burnout zone 11-2, and the slag discharge section 11-3. The outside of the furnace tube combustion area is coated with thermal insulation materials to ensure that the outer shell of the one-dimensional combustion furnace 11 basically does not conduct heat and radiate heat externally. There are openings on the side of the furnace body where the flame observation window 11-6, the multi-functional interface 11-10 can be used as a temperature measurement port, a flue gas sampling port, a particulate matter sampling port, etc., to ensure obtaining data for analyzing the coupled combustion characteristics. The slag discharge section 11-3 can obtain the ash and slag samples after combustion to determine the ash and slag composition and analysis. The base of the one-dimensional combustion furnace 11 has three functions. One is to support the entire furnace body, the second is to collect ash and slag and remove slag, and the third is to serve as the flue gas outlet of the furnace body. After the flue gas duct turns, it is connected to the flue gas cooler 15. The flue gas water wash tank 14, the flue gas cooler 15, the bag filter 16, the desulfurization and denitration device 18, the carbon dioxide adsorption device 19, and the induced draft fan 20 are the flue gas treatment systems at the tail of the one-dimensional furnace.

[0041] The water circulation circuit of the flue gas cooling water system of the flue gas cooler 15 is provided with a thermal resistor to monitor the water temperature at the inlet and outlet. During actual operation, it is necessary to ensure that the highest temperature of the cooling water does not exceed 90 °C to prevent danger caused by vaporization. Two ash cleaning ports for discharging ash and slag are arranged at the bottom of the flue gas cooler 15. After the flue gas is cooled, it passes through the bag filter 16 for dust removal and then enters the desulfurization and denitration device 18. The flue gas after desulfurization and denitration enters the carbon dioxide adsorption device 19, and finally the tail gas is discharged into the atmosphere through the chimney by the induced draft fan 20.

[0042] The control cabinet 21 is the operating platform of the automatic control system for the entire experiment, including a flow measurement device, a pressure measurement device, a temperature measurement device, an oxygen content measurement device, a distributed control system, etc. It adopts a real-time control system. The functions of the entire system can be divided into a real-time data acquisition and processing system, a safety protection system, and an automatic regulation system, which can flexibly control the stable and safe operation of the entire experimental platform.

[0043] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inner", "front", "center", "both ends", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, so it cannot be understood as a limitation to the present invention.

[0044] In the present invention, unless otherwise clearly specified and defined, the terms "installed", "set", "connected", "fixed", "swivelly connected", "padded", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. It can be the internal communication of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, for those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0045] The above description shows and describes the preferred embodiments of the present invention. As mentioned above, it should be understood that the present invention is not limited to the form disclosed herein, should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications, and environments, and can be changed within the scope of the inventive concept described herein through the above teachings or the techniques or knowledge in related fields. And the changes and modifications made by those skilled in the art that do not depart from the spirit and scope of the present invention should all be within the protection scope of the appended claims of the present invention.

Claims

1. A low-carbon fuel blending and coupling combustion test device, characterized in that: including a blended fuel feeding system for proportionally blending solid-phase, liquid-phase and gas-phase low-carbon fuels with fossil solid fuels or other solid fuels; a one-dimensional combustion furnace (11) for the coupled combustion of the blended fuel; a flue gas treatment system for cooling, dedusting, desulfurizing, denitrifying and carbon dioxide adsorption and capture treatment of the flue gas generated by the coupled combustion; and a measurement and control system for real-time collection of system operation data and automatic regulation and safety protection.

2. The low-carbon fuel blending and coupling combustion test equipment according to claim 1, wherein: The blended fuel feeding system includes an air supply system, a fuel blending and conveying system and a coupled combustion system. The air supply system is divided into a primary air system and a secondary air system. The primary air system includes a high-pressure blower (1), an air volume control valve (2), an air volume measuring meter (3), a pipeline heater (4), a primary air and powder mixer (8) and a coupled burner (10). The secondary air system includes a high-pressure blower (1), an air volume control valve (2), an air volume measuring meter (3), a pipeline heater (4) and a coupled burner (10); The fuel blending and conveying system includes a pulverized coal feeder (5), a low-carbon fuel feeder (6) and a fuel flow control valve (7). The coupled combustion system uses a coupled burner (10), and the coupled burner (10) is connected to the one-dimensional combustion furnace (11).

3. The low-carbon fuel blending and coupling combustion test equipment according to claim 2, characterized in that: The coupled burner (10) is a dual-purpose burner that can burn gas-phase and solid-phase (liquid-phase) low-carbon fuels. The coupled burner (10) consists of two concentric circular tubes from the inside to the outside, which are a primary air passage (10-1) and a secondary air passage (10-2) in sequence. The primary air passage (10-1) is vertically connected to a gas fuel passage (10-3), and the gas fuel passage (10-3) is connected to a gas fuel connection port (9). A swirl vane (10-4) is installed at the outlet of the secondary air passage (10-2).

4. The low-carbon fuel blending and coupling combustion test equipment according to claim 1, characterized in that: The one-dimensional combustion furnace (11) includes a main combustion zone (11-1), a burnout zone (11-2) and a slag discharging section (11-3). A fuel inlet (11-4) is arranged at the middle position above the main combustion zone (11-1). An ultraviolet flame detector (11-7) is arranged on the side of the main combustion zone (11-1). The ultraviolet flame detector (11-7) is equipped with a purging device. The purging device includes an air compressor (11-8) and a gas storage tank (11-9) connected in sequence. An inductive heater (11-5) and a flame observation window (11-6) are arranged in the main combustion zone (11-1) and the burnout zone (11-2). A multi-functional interface (11-10) is arranged in the burnout zone (11-2). A water seal funnel (13) is arranged below the slag discharging section (11-3).

5. The low-carbon fuel blending and coupling combustion test equipment according to claim 1, wherein The measurement and control system includes: a control cabinet (21) for an operator to control the switches of each device and monitor various parameters in the system; a real-time data acquisition system for collecting parameters such as the temperature, pressure, air volume, gas flow rate, and flue gas temperature of the furnace body and storing them in the form of trend charts and historical data; a safety protection system that monitors the safe operation of the system through a master fuel trip system (MFT). When situations such as a fan trip, too high a furnace negative pressure or a fire extinction occur, it automatically cuts off the main fuel and alarms. An automatic regulation system for automatically regulating the furnace negative pressure and the coal powder feeding amount to ensure the stable operation of the system during the experiment.

6. The low-carbon fuel blending and coupling combustion test equipment according to claim 4, characterized in that: The flue gas treatment system includes a tail flue gas diversion and ash collection furnace body (12), a flue gas cooler (15), a bag filter (16), a desulfurization and denitration device (18), a carbon dioxide adsorption device (19), and an induced draft fan (20) connected in sequence. A flue gas sampling port (17) is provided on the desulfurization and denitration device (18) and the carbon dioxide adsorption device (19).

7. The low-carbon fuel blending and coupling combustion test equipment according to claim 6, characterized in that: The flue gas treatment system further includes a flue gas water washing tank (14), and the flue gas water washing tank (14) is arranged below the slag discharging section (11-3).

8. The low-carbon fuel blending and coupling combustion test equipment according to claim 6, characterized in that, Thermocouples are arranged at both the inlet and outlet of the water circulation loop inside the flue gas cooler (15) for monitoring the water temperature at the inlet and outlet. Two ash cleaning ports for discharging ash and slag are arranged at the bottom of the flue gas cooler (15).

9. The low-carbon fuel blending and coupling combustion test equipment according to claim 5, characterized in that, The control cabinet (21) includes a flow measurement device, a pressure measurement device, a temperature measurement device, an oxygen content measurement device, and a distributed control system for real-time controlling the operation parameters of the system.

10. A method for low-carbon coupled combustion test, characterized in that, It includes the following steps: Step 1: Fuel preparation, grinding coal and biomass into powders and respectively putting them into a coal powder feeder (5) and a biomass feeder (6), and setting the coal powder feeding amount to control the blending ratio; Step 2: Fuel blending, through a high-pressure blower (1), a pipeline heater (4), and a pulverized coal-air mixer (8), mixing the primary air and the secondary air with the fuel and then sending them into the coupling burner (10); Step 3: Coupling combustion, the fuel undergoes a combustion reaction in the furnace body, and the generated flue gas and furnace slag respectively enter the flue gas treatment system and the slag discharging section; Step 4: Flue gas treatment, after the flue gas is cooled, dust-removed, desulfurized, denitrified, and carbon dioxide is adsorbed, it is discharged into the atmosphere through the induced draft fan (20).

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