A biomass fuel blending mechanism for a pulverized coal boiler

Abstract

The utility model relates to the field of fuel blending combustion mechanism, concretely is a kind of biomass fuel blending combustion mechanism for pulverized coal boiler, including base, the top one end of base is fixedly connected with motor one, the output of motor one is provided with air pump, the top of base is provided with injection feeding mechanism;Beneficial effect is: by starting motor one drives air pump operation to generate airflow, enter compression nozzle to increase pressure, again by injection port is discharged into gas material mixing chamber inside, high pressure airflow is generated at injection port and forms low pressure zone, at this moment, coal powder and biomass are put into feeding bin, by feeding screw rod even send into gas material mixing chamber, fuel and air will be well mixed in low pressure zone, mixed gas and fuel again through diffuser pipe restore part pressure, finally through diffusion port injection is discharged into boiler, improve fuel combustion effect, improve the uniformity and stability of feeding simultaneously.

Description

Technical Field

[0001] This utility model relates to the field of fuel blending mechanisms, specifically a biomass fuel blending mechanism for pulverized coal boilers. Background Technology

[0002] Biomass, as an important renewable energy source, has a wide range of sources and varieties, such as agricultural and forestry solid waste, domestic garbage, and livestock manure. Compared with traditional fossil fuels, biomass has advantages such as low cost, wide availability, large reserves, and renewability, giving it a significant advantage in energy conversion and utilization. Therefore, the rational and efficient utilization of biomass energy has attracted much attention from researchers both domestically and internationally in recent years. The co-combustion of biomass and coal has significant economic and environmental benefits in terms of energy utilization and pollutant emissions. Research reports indicate that during the co-combustion of pulverized coal and biomass, the volatile matter produced by biomass can reduce some of the nitrogen oxides and sulfides produced by pulverized coal combustion, inhibiting the formation of some pollutants to a certain extent and effectively improving the emission characteristics of pollutants in flue gas. Furthermore, the addition of biomass improves the combustion reactivity of the blended fuel, such as increasing the combustion rate, shortening the burnout time, and enhancing combustion stability within the furnace. Co-combustion of biomass and coal in a fluidized bed is an effective way to utilize biomass energy. This not only helps reduce the consumption of non-renewable coal but also contributes to reducing emissions of greenhouse gases CO2, SO2, NOx, and harmful substances such as heavy metals. Therefore, research on adding biomass pellets mixed with coal to fluidized bed combustion boilers has significant practical implications.

[0003] Traditional feeding methods are mechanical, using belt conveyors to directly add pulverized coal or biomass fuel into fluidized bed boilers. Biomass and pulverized coal co-firing technology has long been widely used in power plant boilers and has become quite mature in recent years. However, the existing methods of co-firing biomass in pulverized coal boilers mainly involve directly feeding or injecting biomass into the pulverized coal boiler for co-firing. The former results in poor combustion, while the latter leads to high energy consumption and unstable feeding efficiency. Utility Model Content

[0004] The purpose of this invention is to provide a biomass fuel blending mechanism for pulverized coal boilers to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a biomass fuel blending mechanism for a pulverized coal boiler, comprising a base, a motor fixedly connected to one end of the top of the base, an air pump provided at the output end of the motor, a jet feeding mechanism provided at the top of the base, and a feeding anti-blocking mechanism provided at the top of the jet feeding mechanism. The jet feeding mechanism includes an air-material mixing chamber. One end of the air-material mixing chamber is fixedly connected to an air pump. A compression nozzle is provided at the end of the air-material mixing chamber that is fixedly connected to the air pump. An air intake is provided at one end of the compression nozzle, and the air intake is connected to the output end of the air pump.

[0006] Preferably, the end of the compression nozzle away from the air pump has a spray nozzle, and the diameter of the spray nozzle is smaller than the diameter of the air intake.

[0007] Preferably, a stabilizing support block is fixedly connected to the bottom of the compression nozzle, the bottom of the stabilizing support block is fixedly connected to the gas-material mixing chamber, and both ends of the stabilizing support block are smooth arc-shaped.

[0008] Preferably, a diffuser is fixedly connected to the end of the gas-material mixing chamber away from the gas pump, and a diffuser port is fixedly connected to the end of the diffuser away from the gas-material mixing chamber. The bottom of the diffuser and the diffuser port are fixedly connected to the base through a support frame.

[0009] Preferably, the feeding anti-blocking mechanism includes four support columns, the bottom of the four support columns is fixedly connected to the base, the top of the four support columns is fixedly connected to a feeding bin, and the bottom of the feeding bin is connected to the feeding docking pipe.

[0010] Preferably, a fixing plate is fixedly connected to the inner wall of the feeding hopper, a second motor is fixedly connected to the top of the fixing plate, a feeding screw is fixedly connected to the output end of the second motor, the top diameter of the feeding screw is larger than the bottom diameter, and the bottom of the feeding screw is inserted into the feeding connector.

[0011] Compared with the prior art, the beneficial effects of this utility model are: This invention proposes a biomass fuel blending mechanism for pulverized coal boilers. The mechanism involves starting a motor to drive an air pump, generating airflow that enters a compression nozzle to increase pressure. The airflow is then discharged through an injection port into the gas-fuel mixing chamber, where a high-pressure airflow is generated, creating a low-pressure zone. Pulverized coal and biomass are then fed into the feeding hopper and evenly into the mixing chamber via a feeding screw. The fuel and air mix well in the low-pressure zone. The mixed gas and fuel then pass through a diffuser to restore some pressure before being injected into the boiler through a diffuser, improving fuel combustion efficiency and enhancing the uniformity and stability of the feeding process. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a cross-sectional structural diagram of the practical jet feeding mechanism; Figure 3 This is a schematic diagram of the gas-feed mixing chamber structure of this utility model; Figure 4 This is a cross-sectional schematic diagram of the feeding and anti-blocking mechanism of this utility model.

[0013] In the diagram: 1. Base; 2. Motor 1; 3. Air pump; 4. Spray feeding mechanism; 5. Feeding anti-blocking mechanism; 41. Air-material mixing chamber; 42. Feeding connecting pipe; 43. Stabilizing support block; 44. Compression nozzle; 45. Diffusion pipe; 46. Diffuser port; 47. Air intake port; 48. Spray nozzle; 51. Support column; 52. Feeding bin; 53. Fixing plate; 54. Motor 2; 55. Feeding screw. Detailed Implementation

[0014] To make the objectives, technical solutions, and advantages of this utility model clear and complete, the embodiments of this utility model will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only some, not all, embodiments of this utility model, and are merely used to explain the embodiments of this utility model. They are not intended to limit the embodiments of this utility model. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0015] Please see the appendix Figure 1-4 This application provides the following technical solutions.

[0016] A biomass fuel blending mechanism for a pulverized coal boiler includes a base 1, a motor 2 fixedly connected to one end of the top of the base 1, an air pump 3 installed at the output end of the motor 2, a jet feeding mechanism 4 installed at the top of the base 1, and a feeding anti-blocking mechanism 5 installed at the top of the jet feeding mechanism 4; the jet feeding mechanism 4 includes an air-fuel mixing chamber 41, one end of the air-fuel mixing chamber 41 fixedly connected to the air pump 3, a compression nozzle 44 installed at the end of the air-fuel mixing chamber 41 fixedly connected to the air pump 3, and an air intake 47 opened at one end of the compression nozzle 44, the air intake 47 being connected to the output of the air pump 3. The compressor nozzle 44 is connected to the air pump 3 at the outlet end. The nozzle 48 has a spray port 48 at the end away from the air pump 3. The diameter of the spray port 48 is smaller than the diameter of the air intake port 47. A stable support block 43 is fixedly connected to the bottom of the compressor nozzle 44. The bottom of the stable support block 43 is fixedly connected to the gas-material mixing chamber 41. The two ends of the stable support block 43 are smooth arc-shaped. A diffuser pipe 45 is fixedly connected to the end of the gas-material mixing chamber 41 away from the air pump 3. A diffuser port 46 is fixedly connected to the end of the diffuser pipe 45 away from the gas-material mixing chamber 41. The bottom of the diffuser pipe 45 and the diffuser port 46 are fixedly connected to the base 1 through a support frame.

[0017] It should be noted that during use, the operator starts motor 2 to drive air pump 3, which generates airflow that enters intake port 47. Since intake port 47 has a smaller diameter than injection port 48, a funnel-shaped space is formed inside compression nozzle 44, increasing the pressure of the airflow entering compression nozzle 44. The airflow is then discharged into gas-fuel mixing chamber 41 through injection port 48. The airflow passes through diffuser pipe 45 and diffuser port 46 and is discharged into boiler. At the same time, high-pressure airflow is generated at injection port 48, forming a low-pressure zone. The pulverized coal and biomass fuel and air entering gas-fuel mixing chamber 41 will be well mixed in the low-pressure zone. The mixed gas and fuel then regain some pressure through diffuser pipe 45 and are finally injected into boiler for combustion through diffuser port 46, improving fuel combustion efficiency.

[0018] The feeding anti-blocking mechanism 5 includes four support columns 51. The bottom of the four support columns 51 is fixedly connected to the base 1. The top of the four support columns 51 is fixedly connected to the feeding bin 52. The bottom of the feeding bin 52 is connected to the feeding connector 42. The inner wall of the feeding bin 52 is fixedly connected to the fixing plate 53. The top of the fixing plate 53 is fixedly connected to the motor 54. The output end of the motor 54 is fixedly connected to the feeding screw 55. The top diameter of the feeding screw 55 is larger than the bottom diameter. The bottom of the feeding screw 55 is inserted into the feeding connector 42.

[0019] It should be noted that the staff put the coal powder and biomass fuel into the feeding bin 52, and start the motor 54 to drive the feeding screw 55 to rotate. The feeding screw 55 stirs the coal powder and biomass fuel and then evenly feeds it into the gas-fuel mixing chamber 41. The rotation of the feeding screw 55 prevents the coal powder and biomass fuel from clogging the feeding pipe 42.

[0020] During operation, the operator starts motor 2, which drives air pump 3 to operate. Air pump 3 generates airflow, which enters air intake 47. Since the diameter of air intake 47 is smaller than that of injection port 48, a funnel-shaped space is formed inside the compression nozzle 44, increasing the pressure of the airflow entering the compression nozzle 44. The airflow is then discharged into the gas-fuel mixing chamber 41 through injection port 48. The airflow passes through diffuser pipe 45 and diffuser port 46 and is discharged into the boiler. At the same time, a high-pressure airflow is generated at injection port 48, forming a low-pressure zone. At this time, the operator puts pulverized coal and biomass fuel into the feeding bin. In step 52, the starting motor 54 drives the feeding screw 55 to rotate, which stirs the added pulverized coal and biomass fuel. The mixture is then evenly fed into the gas-fuel mixing chamber 41. The rotation of the feeding screw 55 prevents the pulverized coal and biomass fuel from clogging the feeding pipe 42. The pulverized coal and biomass fuel and air in the gas-fuel mixing chamber 41 will be well mixed in the low-pressure zone. The mixed gas and fuel will then be partially pressurized through the diffuser pipe 45 and finally injected into the boiler for combustion through the diffuser port 46, thereby improving the fuel combustion efficiency.

[0021] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A biomass fuel blending mechanism for a pulverized coal boiler, comprising a base (1), a motor (2) fixedly connected to one end of the top of the base (1), an air pump (3) provided at the output end of the motor (2), a jet feeding mechanism (4) provided at the top of the base (1), and a feeding anti-blocking mechanism (5) provided at the top of the jet feeding mechanism (4). Its features are: The blowing feeding mechanism (4) includes an air-material mixing chamber (41), one end of which is fixedly connected to an air pump (3). A compression nozzle (44) is provided at the end of the air-material mixing chamber (41) that is fixedly connected to the air pump (3). An air intake (47) is provided at one end of the compression nozzle (44), and the air intake (47) is connected to the output end of the air pump (3).

2. The biomass fuel blending mechanism for a pulverized coal boiler according to claim 1, characterized in that: The end of the compression nozzle (44) away from the air pump (3) is provided with a spray nozzle (48), the diameter of which is smaller than the diameter of the air intake (47).

3. A biomass fuel blending mechanism for a pulverized coal boiler according to claim 1, characterized in that: The bottom of the compression nozzle (44) is fixedly connected to a stabilizing support block (43), the bottom of the stabilizing support block (43) is fixedly connected to the gas-material mixing chamber (41), and the two ends of the stabilizing support block (43) are smooth arc-shaped.

4. A biomass fuel blending mechanism for a pulverized coal boiler according to claim 1, characterized in that: The gas-material mixing chamber (41) is fixedly connected to a diffuser pipe (45) at one end away from the gas pump (3), and a diffuser port (46) is fixedly connected to the other end of the diffuser pipe (45) away from the gas-material mixing chamber (41). The bottom of the diffuser pipe (45) and the diffuser port (46) are fixedly connected to the base (1) through a support frame.

5. A biomass fuel blending mechanism for a pulverized coal boiler according to claim 1, characterized in that: The feeding anti-blocking mechanism (5) includes four support columns (51), the bottom of the four support columns (51) is fixedly connected to the base (1), the top of the four support columns (51) is fixedly connected to the feeding bin (52), and the bottom of the feeding bin (52) is connected to the feeding docking pipe (42).

6. A biomass fuel blending mechanism for a pulverized coal boiler according to claim 5, characterized in that: The inner wall of the feeding bin (52) is fixedly connected to a fixing plate (53), the top of the fixing plate (53) is fixedly connected to a motor (54), the output end of the motor (54) is fixedly connected to a feeding screw (55), the top diameter of the feeding screw (55) is larger than the bottom diameter, and the bottom of the feeding screw (55) is inserted into the feeding connector (42).

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