Blending combustion system for blending combustion of biomass and gasification fine slag of pulverized coal boiler

Abstract

The invention relates to the technical field of blending combustion of pulverized coal boilers and solid waste disposal, in particular to a blending combustion system for blending combustion of biomass and gasification fine slag of a pulverized coal boiler. The blending combustion system comprises a boiler, a raw coal powder conveying system, a biomass gasification conveying system, a gasification fine slag conveying system, a mixing device, a booster fan and an atomization device. The boiler is provided with a combustor and a secondary air inlet; an inlet of the mixing device is connected with the raw coal powder conveying system and the biomass gasification conveying system, and an outlet of the mixing device is connected with a combustor of the boiler. An inlet of the atomization device is connected with the gasified fine slag conveying system and the booster fan, and an outlet of the atomization device is connected with a secondary air inlet of the boiler. Atomized gasified fine slag is sprayed in through the independent secondary air nozzle, under the condition that the mixing proportion of the gasified fine slag is regulated and controlled, the melting agglomeration phenomenon is effectively reduced, and the problem that after the gasified fine slag is added into a system provided in the prior art, a large number of melting areas appear in ash slag, combustible materials are wrapped, and combustion is hindered is solved.

Description

Technical Field

[0001] The invention relates to the technical field of pulverized coal boiler co-firing and solid waste disposal, and in particular to a pulverized coal boiler co-firing system for biomass and gasified fine slag. Background Art

[0002] The pulverized coal boiler blended combustion system or biomass technology is a cyclic blending of high-carbon gasification fine slag and biomass, which not only utilizes the carbon resources, but also converts high-carbon slag into low-carbon slag, which is conducive to the use of gasification fine slag and biomass as building materials. The use of pulverized coal boiler blending can realize the comprehensive resource utilization of gasification fine slag and biomass and reduce environmental pollution.

[0003] Prior art 1: CN 216481074 U discloses a system suitable for direct mixing of gasified fine slag with pulverized coal boilers, which mainly includes a gasified fine slag conveying system, a high-temperature and high-pressure atomization and drying system, and a new type of powder conveying system. The gasified fine slag conveying system includes a gasified fine slag storage bin, a positive pressure feeding device, a paste pump, and a conveying pipeline connected in sequence; the high-temperature and high-pressure atomization and drying system includes a hot primary air bypass and an atomization device, the atomizing air is drawn out from the hot primary air bypass, and the pressure head is increased by a booster fan and then led to the atomization device to achieve atomization and drying of the gasified fine slag; the gasified fine slag carrying flow conveying pipeline at the outlet of the atomization device is connected to the pulverized coal pipeline through a mixing device, forming a new type of powder conveying system, which achieves efficient mixing of the gasified fine slag carrying flow and the pulverized coal airflow.

[0004] However, in the system provided by the prior art 1, the pulverized coal feeding system and the gasification fine slag system enter the mixing device together, and then directly enter the boiler from the combustion chamber. As a result, after the gasification fine slag is added to the boiler, a large amount of molten area appears in the ash, which wraps the combustible material and thus hinders combustion. Summary of the invention

[0005] In order to solve the problem that after adding gasified fine slag, a large number of molten areas appear in the ash slag provided by the prior art, which wraps the combustibles and thus hinders combustion, the purpose of the present invention is to provide a pulverized coal boiler co-firing system for biomass and gasified fine slag.

[0006] To achieve the above objectives, the technical solution of the present invention is as follows.

[0007] The present invention provides a system for the co-firing of biomass and gasified fine slag in a pulverized coal boiler, comprising a boiler, a raw coal pulverizing system, a biomass gasification conveying system, a gasification fine slag conveying system, a mixing device, a booster fan and an atomizing device; the boiler has a burner and a secondary air inlet; the inlet of the mixing device is respectively connected to the raw coal pulverizing system and the biomass gasification conveying system, and the outlet of the mixing device is connected to the burner of the boiler; the inlet of the atomizing device is respectively connected to the gasification fine slag conveying system and the booster fan, and the outlet of the atomizing device is connected to the secondary air inlet of the boiler.

[0008] The present invention mainly sprays gasified fine slag through a separate secondary air inlet, thereby being able to regulate the blending ratio of the gasified fine slag, while effectively reducing the melting agglomeration phenomenon and improving the combustion efficiency, thereby solving the problem that in the system provided by the prior art, after the gasified fine slag is added, a large number of melting areas appear in the ash slag, which wraps the combustibles and thus hinders combustion.

[0009] Preferably, it further comprises a primary air duct, wherein the first outlet of the primary air duct is connected to the inlet of the raw coal powder conveying system, and the second outlet of the primary air duct is connected to the inlet of the booster fan. The system of the present invention uses the booster fan to provide the atomizing device with high-temperature and high-pressure primary air for atomization, and does not require additional pre-drying of gasified fine slag, thereby reducing the investment cost and steam cost of the drying device.

[0010] Preferably, the co-firing system includes an air preheater, the flue gas outlet of the boiler is connected to the flue gas duct, and the outlet of the flue gas duct is connected to the inlet of the air preheater; a portion of the primary air duct is coiled in the air preheater, and is configured to perform heat exchange and temperature raising on the primary air in the primary air duct. The air preheater is used to perform heat exchange and temperature raising on the primary air in the primary air duct. The primary air is heated by heat exchange and temperature raising using the air preheater, and the primary air after heat exchange and temperature raising enters the raw coal powder conveying system and the booster fan through the primary air duct, respectively, to dry the coal powder and atomize the gasified fine slag.

[0011] Preferably, the raw coal pulverizing system includes a coal mill, the first outlet of the primary air duct is connected to the inlet of the coal mill, and the outlet of the coal mill is connected to the mixing device.

[0012] Preferably, the raw coal powder conveying system comprises a raw coal bunker, a coal feeder and a powder conveying pipeline, the outlet of the raw coal bunker is connected to the inlet of the coal feeder, the outlet of the coal feeder is connected to the inlet end of the powder conveying pipeline, the outlet end of the powder conveying pipeline is connected to the inlet of the coal mill, and the outlet of the coal mill is connected to the first inlet of the mixing device. In the present invention, the coal in the raw coal bunker enters the powder conveying pipeline through the coal feeder, and enters the coal mill through the powder conveying pipeline to grind the coal in the raw coal bunker, and the ground coal powder enters the mixing device.

[0013] Preferably, the blending system includes a first control system, an inlet of the first control system is connected to the raw coal bin, and an outlet of the first control system is connected to the coal feeder.

[0014] Preferably, the biomass gasification and transportation system includes a biomass gasification device and a purification device, the outlet of the biomass gasification device is connected to the inlet of the purification device, and the outlet of the purification device is connected to the second inlet of the mixing device. The biomass gasification device of the present invention is used to heat and gasify the input biomass to form fuel gas. The purification device is used to purify the fuel gas. The biomass enters the biomass gasification device, heats and gasifies the biomass to form fuel gas, and then the fuel gas is purified by the purification device to remove impurities such as solid particles and water in the fuel gas, thereby effectively alleviating the ash and slagging on the heating surface of the rear of the boiler. The purified fuel gas is sent to the mixing device so that the purified fuel gas is mixed with the ground coal powder in the mixing device. Then the mixed mixture is driven by the primary wind into the burner of the boiler for mixed combustion.

[0015] Preferably, the co-firing system comprises a second control system, an inlet of the second control system is connected to the biomass gasification device, and an outlet of the second control system is connected to the purification device.

[0016] Preferably, the gasified fine slag conveying system includes a gasified fine slag storage bin, a positive pressure feeding device and a paste pump; the outlet of the gasified fine slag storage bin is connected to the inlet of the positive pressure feeding device, the outlet of the positive pressure feeding device is connected to the inlet of the paste pump; the outlet of the paste pump is connected to the inlet of the atomizing device. The gasified fine slag storage bin of the present invention is used to provide gasified fine slag, and the gasified fine slag enters the atomizing device through the positive pressure feeding device and the paste pump, and the gasified fine slag in the atomizing device is atomized by the high-temperature and high-pressure primary air used for atomization, and then sent to the secondary air nozzle of the boiler. The present invention connects the primary air duct through the gasified fine slag conveying system, and then enters the boiler after atomization, and burns after forming combustion particles in the boiler. Since the atomized gasified fine slag is sprayed into the atomized gasified fine slag through a separate secondary air nozzle, the mixing ratio of the gasified fine slag can be reduced, thereby effectively reducing the melting agglomeration phenomenon.

[0017] Preferably, the blending system includes a third control system, the inlet of the third control system is connected to the gasified fine slag storage bin, and the outlet of the third control system is connected to the positive pressure feeding device. The present invention can adjust the blending ratio of coal, biomass and gasified fine slag according to the required blending ratio of the fuel through the first control system, the second control system and the third control system to meet the fuel required for boiler combustion.

[0018] Beneficial effects of the present invention:

[0019] 1. The present invention sprays atomized gasified fine slag through a separate secondary air inlet, thereby being able to regulate the blending ratio of the gasified fine slag, while effectively reducing the melting agglomeration phenomenon and improving the combustion efficiency, thereby solving the problem that after the gasified fine slag is added to the system provided by the prior art, a large number of molten areas appear in the ash slag, which wraps the combustibles and thus hinders combustion.

[0020] 2. The system of the present invention uses a booster fan to provide high-temperature and high-pressure primary air used for atomization to the atomization device, and does not require additional pre-drying of gasified fine slag, thereby reducing the investment cost and steam cost of the drying device. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A system layout diagram of a pulverized coal boiler co-firing biomass and gasified fine slag provided in one embodiment of the present invention.

[0022] Description of reference numerals:

[0023] 1. Boiler; 2. Primary fan; 3. Air preheater; 4. Raw coal bunker; 5. First control system; 6. Coal feeder; 7. Coal pulverizer; 8. Biomass gasification device; 9. Second control system; 10. Purification device; 11. Mixing device; 12. Gasification fine slag storage bin; 13. Third control system; 14. Positive pressure feeding device; 15. Paste pump; 16 Booster fan; 17 Atomization device. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the 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] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of the present invention.

[0026] Prior art 1: CN 216481074 U discloses a system suitable for direct mixing of gasified fine slag with pulverized coal boilers, which mainly includes a gasified fine slag conveying system, a high-temperature and high-pressure atomization and drying system, and a new type of powder conveying system. The gasified fine slag conveying system includes a gasified fine slag storage bin, a positive pressure feeding device, a paste pump, and a conveying pipeline connected in sequence; the high-temperature and high-pressure atomization and drying system includes a hot primary air bypass and an atomization device, the atomizing air is drawn out from the hot primary air bypass, and the pressure head is increased by a booster fan and then led to the atomization device to achieve atomization and drying of the gasified fine slag; the gasified fine slag carrying flow conveying pipeline at the outlet of the atomization device is connected to the pulverized coal pipeline through a mixing device, forming a new type of powder conveying system, which achieves efficient mixing of the gasified fine slag carrying flow and the pulverized coal airflow.

[0027] However, in the system provided by the prior art 1, the pulverized coal feeding system and the gasification fine slag system enter the mixing device together, and then directly enter the boiler from the combustion chamber. As a result, after the gasification fine slag is added to the boiler, a large amount of molten area appears in the ash, which wraps the combustible material and thus hinders combustion.

[0028] Based on this, the present invention provides a system for mixing biomass and gasified fine slag in a pulverized coal boiler. The present invention mainly sprays the gasified fine slag into the boiler through a separate secondary air inlet, thereby regulating the mixing ratio of the gasified fine slag, effectively reducing the melting agglomeration phenomenon, and improving the combustion efficiency. It solves the problem that after adding the gasified fine slag, a large number of melting areas appear in the ash slag, which wraps the combustibles and hinders the combustion. The booster fan is used to provide the atomizing device with high-temperature and high-pressure primary air for atomization, and no additional pre-drying of the gasified fine slag is required, which reduces the investment cost and steam cost of the drying device.

[0029] The technical solution of the present invention is further described below by means of specific examples. In the following examples, the methods described are conventional methods unless otherwise specified; the reagents and materials described are commercially available unless otherwise specified.

[0030] like Figure 1 A pulverized coal boiler co-firing biomass and gasified fine slag system comprises a boiler 1, a raw coal pulverizing system, a biomass gasification conveying system, a gasified fine slag conveying system, a mixing device 11, a booster fan 16 and an atomizing device 17.

[0031] The inlet of the raw coal powder conveying system is connected to the first outlet of the primary air duct, and the outlet of the raw coal powder conveying system is connected to the first inlet of the mixing device 11; the outlet of the biomass gasification conveying system is connected to the second inlet of the mixing device 11, and the outlet of the mixing device 11 is connected to the burner on the boiler 1.

[0032] Specifically, the raw coal powder conveying system is used to provide fine coal powder, the primary air duct is used to provide primary air, and the biomass gasification conveying system is used to provide gasified biomass. The primary air conveys the coal powder into the mixing device 11, and the gasified biomass is mixed with the coal powder airflow in the mixing device 11.

[0033] The first inlet of the atomizing device 17 is connected to the gasification fine slag conveying system, the second inlet of the atomizing device 17 is connected to the outlet of the booster fan 16, the inlet of the booster fan 16 is connected to the second outlet of the primary air duct, and the outlet of the atomizing device 17 is connected to the secondary air inlet on the boiler 1.

[0034] Specifically, the gasified fine slag conveying system is used to provide gasified fine slag; the atomizing device 17 is used to atomize the gasified fine slag to form atomized gasified fine slag. The booster fan 16 is used to provide the atomizing device 17 with high-temperature and high-pressure primary air for atomization. After the high-temperature and high-pressure primary air enters the atomizing device 17, the gasified fine slag in the atomizing device 17 is atomized to form atomized gasified fine slag. The atomized gasified fine slag is sent into the boiler 1 through the secondary air inlet at the upper part of the furnace of the boiler 1. The embodiment of the present invention forms combustion particles in the boiler 1 by sending the atomized gasified fine slag into the boiler 1, and then burns. Since the atomized gasified fine slag is sprayed into the atomized gasified fine slag through the separately established secondary air nozzle, not only the mixing ratio of the gasified fine slag can be reduced, but also the melting and agglomeration phenomenon of the gasified fine slag can be effectively reduced, thereby improving the combustion efficiency. In addition, the gasified fine slag in the embodiment of the present invention does not require additional pre-drying, which reduces the investment cost and steam cost of the drying device.

[0035] On the basis of the above embodiment, as a more preferred embodiment, the blending system includes a primary air fan 2 and an air preheater 3; the flue gas outlet of the boiler 1 is connected to the flue gas duct, the outlet of the flue gas duct is connected to the inlet of the air preheater 3, and the outlet of the air preheater 3 is connected to the flue gas treatment system. The inlet of the primary air duct is connected to the primary air fan 2, a part of the primary air duct is coiled in the air preheater 3, the first outlet of the primary air duct is connected to the inlet of the raw coal powder conveying system; the second outlet of the primary air duct is connected to the inlet of the booster fan 16.

[0036] Specifically, the air preheater 3 is used to heat the primary air in the primary air duct. The primary air is heated by the air preheater 3, and the primary air after heat exchange and heating enters the raw coal conveying system and the booster fan 16 through the primary air duct to dry the coal powder and atomize the gasified fine slag.

[0037] On the basis of the above-mentioned embodiment, as a more preferred embodiment, the raw coal powder conveying system includes a raw coal bin 4, a coal feeder 6, a powder conveying pipeline and a coal mill 7, the outlet of the raw coal bin 4 is connected to the inlet of the coal feeder 6, the outlet of the coal feeder 6 is connected to the inlet end of the powder conveying pipeline, the outlet end of the powder conveying pipeline is connected to the inlet of the coal mill 7, and the outlet of the coal mill 7 is connected to the first inlet of the mixing device 11.

[0038] Specifically, the coal in the raw coal bin 4 enters the powder conveying pipeline through the coal feeder 6 and enters the coal mill 7 through the powder conveying pipeline to grind the coal in the raw coal bin 4 , and the ground coal powder enters the mixing device 11 .

[0039] Based on the above embodiment, as a more preferred embodiment, the biomass gasification and transportation system includes a biomass gasification device 8 and a purification device 10, the outlet of the biomass gasification device 8 is connected to the inlet of the purification device 10, and the outlet of the purification device 10 is connected to the second inlet of the mixing device 11.

[0040] Specifically, the biomass gasification device 8 is used to heat and gasify the input biomass to form fuel gas. The purification device 10 is used to purify the fuel gas. The biomass enters the biomass gasification device 8, where the biomass is heated and gasified to form fuel gas, and then the fuel gas is purified by the purification device 10 to remove impurities such as solid particles and water in the fuel gas, thereby effectively alleviating the ash and slagging on the heating surface at the rear of the boiler. The purified fuel gas is sent to the mixing device 11 so that the purified fuel gas is mixed with the ground coal powder in the mixing device. The mixed mixture is then driven by the primary wind into the burner of the boiler 1 for mixed combustion.

[0041] Specifically, the purification device 10 includes a dust removal device, a washing tower and a dryer, which are connected in sequence. The dust removal device is used to remove dust from the fuel gas to remove solid particles in the fuel gas. The washing tower is used to further purify the fuel gas. The dryer is used to dry the fuel gas. The purification device 10 of the embodiment of the present invention can effectively remove impurities such as solid particles and water in the fuel gas, thereby effectively alleviating the ash and slagging situation on the heating surface of the rear of the boiler.

[0042] On the basis of the above embodiment, as a more preferred embodiment, the gasification fine slag conveying system includes a gasification fine slag storage bin 12, a positive pressure feeding device 14 and a paste pump 15. The outlet of the gasification fine slag storage bin 12 is connected to the inlet of the positive pressure feeding device 14, the outlet of the positive pressure feeding device 14 is connected to the inlet of the paste pump 15; the outlet of the paste pump 15 is connected to the inlet of the atomization device 17.

[0043] Specifically, the gasified fine slag storage bin 12 is used to provide gasified fine slag, and the gasified fine slag enters the atomizing device 17 through the positive pressure feeding device 14 and the paste pump 15. The gasified fine slag in the atomizing device 17 is atomized by the high-temperature and high-pressure primary air used for atomization, and then sent to the secondary air nozzle of the boiler 1. In the embodiment of the present invention, the gasified fine slag conveying system is connected to the primary air duct, and then enters the boiler after atomization, and then burns after forming combustion particles in the boiler. Since the atomized gasified fine slag is sprayed into the separate secondary air nozzle, the mixing ratio of the gasified fine slag can be reduced, thereby effectively reducing the melting agglomeration phenomenon.

[0044] On the basis of the above-mentioned embodiment, as a more preferred embodiment, the blending system includes a first control system 5, a second control system 9 and a third control system 13. The inlet of the first control system 5 is connected to the raw coal bin 4, and the outlet of the first control system 5 is connected to the coal feeder 6. The inlet of the second control system 9 is connected to the biomass gasification device 8, and the outlet of the second control system 9 is connected to the purification device 10. The inlet of the third control system 13 is connected to the gasified fine slag storage bin 12, and the outlet of the third control system 13 is connected to the positive pressure feeding device 14. The positive pressure feeding device 14 is specifically a positive pressure feeder, which cooperates with the paste pump 15 to feed the gasified fine slag in the gasified fine slag storage bin 12 into the atomization device 17.

[0045] Specifically, the first control system 5 is placed between the raw coal bin 4 and the coal feeder 6, the second control system 9 is placed between the biomass gasification device 8 and the purification device 10, and the third control system 13 is placed between the gasification fine slag storage bin 12 and the positive pressure feeding device 14. The first control system 5, the second control system 9, and the third control system 13 can adjust the blending ratio of coal, biomass, and gasification fine slag according to the required blending ratio of the fuel to meet the fuel required for boiler combustion. Specifically, the first control system 5 includes a first control valve; the second control system 9 includes a second control valve; and the third control system 13 includes a third control valve. The first control valve, the second control valve, and the third control valve are respectively connected to the control module to respectively adjust the flow of coal, biomass, and gasification fine slag, and then adjust the blending ratio of coal, biomass, and gasification fine slag.

[0046] The specific implementation of the system for burning biomass and gasified fine slag in a pulverized coal boiler is as follows:

[0047] The raw coal enters the coal mill 7 through the coal feeder 6, and enters the coal powder conveying pipeline after being ground and dried. The biomass gasification device 8 heats and gasifies the input biomass, and then sends it to the purification device 10. The gasified biomass is mixed with the coal powder airflow in the mixing device 11; and then sent to the burner of the boiler 1 under the action of the primary air.

[0048] The gasified fine slag in the gasified fine slag storage bin 12 enters the atomizing device 17 through the positive pressure feeding device 14 and the paste pump 15; the high temperature and high pressure primary air used for atomization enters the atomizing device 17 through the booster fan 16, and then the gasified fine slag is atomized and dried. The atomized gasified fine slag is sent into the boiler 1 from the secondary air inlet at the upper part of the furnace of the boiler 1. Under the action of high temperature, the surface loses water and hardens to form fuel particles, which then enter the combustion area of ​​the boiler 1 for combustion. Spraying the atomized gasified fine slag through a separate secondary air nozzle can reduce the mixing ratio of the gasified fine slag, thereby effectively reducing the melting agglomeration phenomenon.

[0049] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A pulverized coal boiler co-firing system for biomass and gasified fine slag, characterized in that: It comprises a boiler (1), a raw coal powder conveying system, a biomass gasification conveying system, a gasification fine slag conveying system, a mixing device (11), a booster fan (16) and an atomizing device (17); The boiler (1) has a burner and a secondary air inlet; The inlet of the mixing device (11) is connected to the raw coal powder conveying system and the biomass gasification conveying system respectively, and the outlet of the mixing device (11) is connected to the burner of the boiler (1); The inlet of the atomizing device (17) is connected to the gasification fine slag conveying system and the booster fan (16) respectively, and the outlet of the atomizing device (17) is connected to the secondary air inlet of the boiler (1).

2. The pulverized coal boiler co-firing system for biomass and gasified fine slag according to claim 1, characterized in that: It also includes a primary air duct, a first outlet of the primary air duct is connected to the inlet of the raw coal powder conveying system, and a second outlet of the primary air duct is connected to the inlet of the booster fan (16).

3. The pulverized coal boiler co-firing system for biomass and gasified fine slag according to claim 2, characterized in that: The co-firing system comprises an air preheater (3), the flue gas outlet of the boiler (1) is connected to a flue gas duct, and the outlet of the flue gas duct is connected to the inlet of the air preheater (3); A portion of the primary air duct is coiled inside the air preheater (3) and is configured to perform heat exchange and temperature raising on the primary air in the primary air duct.

4. The system for mixing biomass and gasified fine slag in a pulverized coal boiler according to claim 2, characterized in that: The raw coal pulverizing system comprises a coal mill (7), the first outlet of the primary air duct is connected to the inlet of the coal mill (7), and the outlet of the coal mill (7) is connected to the mixing device (11).

5. The system for mixing biomass and gasified fine slag in a pulverized coal boiler according to claim 4, characterized in that: The raw coal powder conveying system comprises a raw coal bin (4), a coal feeder (6) and a powder conveying pipeline, wherein the outlet of the raw coal bin (4) is connected to the inlet of the coal feeder (6), the outlet of the coal feeder (6) is connected to the inlet end of the powder conveying pipeline, the outlet end of the powder conveying pipeline is connected to the inlet of the coal mill (7), and the outlet of the coal mill (7) is connected to the first inlet of the mixing device (11).

6. The system for mixing biomass and gasified fine slag in a pulverized coal boiler according to claim 5, characterized in that: The blending system comprises a first control system (5), the inlet of the first control system (5) is connected to the raw coal bin (4), and the outlet of the first control system (5) is connected to the coal feeder (6).

7. The system for mixing biomass and gasified fine slag in a pulverized coal boiler according to claim 1, characterized in that: The biomass gasification and transportation system comprises a biomass gasification device (8) and a purification device (10), wherein the outlet of the biomass gasification device (8) is connected to the inlet of the purification device (10), and the outlet of the purification device (10) is connected to the second inlet of the mixing device (11).

8. The system for mixing biomass and gasified fine slag in a pulverized coal boiler according to claim 7, characterized in that: The co-firing system comprises a second control system (9), the inlet of the second control system (9) is connected to the biomass gasification device (8), and the outlet of the second control system (9) is connected to the purification device (10).

9. The system for mixing biomass and gasified fine slag in a pulverized coal boiler according to claim 1, characterized in that: The gasified fine slag conveying system comprises a gasified fine slag storage bin (12), a positive pressure feeding device (14) and a paste pump (15); the outlet of the gasified fine slag storage bin (12) is connected to the inlet of the positive pressure feeding device (14), the outlet of the positive pressure feeding device (14) is connected to the inlet of the paste pump (15); the outlet of the paste pump (15) is connected to the inlet of the atomizing device (17).

10. The system for mixing biomass and gasified fine slag in a pulverized coal boiler according to claim 9, characterized in that: The blending system comprises a third control system (13), the inlet of the third control system (13) is connected to the gasification fine slag storage bin (12), and the outlet of the third control system (13) is connected to the positive pressure feeding device (14).

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