A biomass ash stalk furnace yellow stalk feeding system

Abstract

The present invention provides a biomass ash stalk furnace yellow stalk feeding system, which mainly relates to the field of feeding systems. A biomass ash stalk furnace yellow stalk feeding system comprises a main conveying line, a mounting frame is arranged above the downstream of the main conveying line, at least two compression boxes are arranged on the mounting frame, the top of the compression box has a compression chamber, the bottom of the compression chamber is arranged with a conical chamber, compression components are arranged on both sides of the compression chamber, the compression components are circular arc surfaces facing each other, a compression power unit is arranged between the compression component and the compression chamber, a power frame is arranged above the compression box, a spiral feeding shaft is rotatably arranged on the power frame, a conical feeding piece adapted to the conical chamber is arranged at the bottom of the spiral feeding shaft, a linear feeding mechanism is arranged on the adjusting frame, a secondary conveying line is arranged above the feeding conveyor belt, a receiving bin is arranged below the mounting frame, and a lead-out conveyor belt is arranged at the bottom of the receiving bin. The beneficial effects of the present invention are: the present invention realizes the uniform proportioning and uniform speed transportation of yellow stalk fuel and ash stalk fuel, and ensures the temperature uniformity of the fuel boiler.

Description

Technical Field

[0001] The invention mainly relates to the field of feeding systems, in particular to a biomass ash stalk furnace yellow stalk feeding system. Background Art

[0002] In recent years, biomass power plants have begun adjusting their fuel mix, focusing on the storage of local straw and other yellow stalk fuels. This has led to a significant increase in the proportion of straw used as fuel. To adapt to this new fuel mix, further increase the use of yellow stalk in boilers, reduce reliance on bark and wood, and lower production costs, optimizing and improving the use of yellow stalk fuel in boilers is imperative.

[0003] Currently, the method of feeding gray stalk fuel and yellow stalk fuel alternately is used. Since the density of straw is smaller than that of other fuels such as bark, the calorific value of the two is also different, and the conveying capacity of the conveyor belt cannot be consistent. At the same time, the feeding amount of the furnace feeder is also inconsistent, making it difficult to control the connection between the gray stalk and yellow stalk feeding. If the size of the furnace feeder is increased, it is easy for the gray stalk fuel to not be fully loaded and cause a conveying gap and uneven feeding. If the size of the furnace feeder is not increased, the yellow stalk fuel is prone to blockage. At the same time, the intermittent feeding of gray stalk fuel and yellow stalk fuel is prone to cause feeding interruptions, which ultimately makes it difficult to control the heat regulation of the boiler, which is very passive to increase the use of yellow stalk in the boiler. Summary of the Invention

[0004] In order to solve the deficiencies of the prior art, the present invention provides a biomass ash stalk furnace yellow stalk feeding system, which can realize the combustion of yellow stalk fuel filled in the ash stalk furnace at the same time, making the overall feeding continuous and providing convenience for the heat regulation of the boiler.

[0005] To achieve the above-mentioned purpose, the present invention is implemented through the following technical solutions:

[0006] A biomass ash stalk furnace yellow stalk feeding system comprises a main conveying line, which is inclined, a mounting frame is arranged above the downstream of the main conveying line, at least two compression boxes are arranged on the mounting frame, a compression chamber is provided on the top of the compression box, a conical chamber is provided at the bottom of the compression chamber, a discharge port is provided at the bottom of the conical chamber, a pneumatic shear is provided below the discharge port, a partition is provided between the compression chamber and the conical chamber, a connecting hole is provided on the partition, compression components are provided on both sides of the compression chamber, the compression components are circular arc surfaces on one side facing each other, a compression power unit is provided between the compression component and the compression chamber, and when the compression components on both sides are docked, a compression channel is formed between the two compression components, a power frame is provided above the compression box, and a spiral conveyor is provided on the power frame for rotation. The material shaft, the power frame is provided with a rotating power mechanism for driving the spiral feeding shaft to rotate, the top of the spiral feeding shaft is provided with a sizing spiral feeding piece adapted to the compression channel, the bottom of the spiral feeding shaft is provided with a conical feeding piece adapted to the conical cavity, an adjusting frame is provided above the mounting frame, a conveying frame is slidably provided on the adjusting frame, a feeding conveyor belt is provided on the conveying frame, a linear feeding mechanism for driving the conveying frame to slide back and forth along the adjusting frame is provided on the adjusting frame, a secondary conveyor line is provided above the feeding conveyor belt, the secondary conveyor line is inclined, a material receiving bin is provided below the mounting frame, a lead-out conveyor belt is provided at the bottom of the material receiving bin, the downstream of the lead-out conveyor belt is located above the main conveyor line, a limit plate is provided in the material receiving bin, and the limit plate is adapted to the lead-out conveyor belt.

[0007] A material baffle is provided downstream of the main conveying line, the bottom of the material baffle is an arc surface, and an acute angle is formed between the material baffle and the main conveying line.

[0008] Both sides of the compression assembly are chamfered, and both sides of the compression assembly are in contact with the inner wall of the compression box. When the two compression assemblies are docked, the joint between the two compression assemblies is a notch.

[0009] The inner wall of the conical cavity is fitted with the conical feeding piece, and the contact edge between the conical feeding piece and the inner wall of the conical cavity is welded with hard alloy.

[0010] The linear feeding mechanism is a transmission chain mechanism, which is arranged along the adjustment frame, and the chain of the transmission chain mechanism is fixedly connected to the conveying frame.

[0011] The conveyor belt covers the bottom surface of the material receiving bin, and the downstream of the conveyor belt extends to the outside of the material receiving bin.

[0012] The compression power unit adopts a hydraulic cylinder, and the rotation power mechanism adopts a high-torque hydraulic motor.

[0013] After the main conveyor line passes through the material blocking plate, the gray rod material on the main conveyor line becomes concave, and the lead-out conveyor belt continuously releases the compressed yellow rod material onto the concave gray rod.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] The present invention achieves volume compression of the yellow-stem fuel through a compression unit, simultaneously delivering the yellow-stem fuel continuously. The yellow-stem fuel is laid on top of the gray-stem fuel, allowing for simultaneous delivery of the gray and yellow-stem fuels, thereby achieving mixed combustion of the gray and yellow-stem fuels. In this delivery mode, the gray and yellow-stem fuels are evenly delivered, resulting in more uniform combustion of the delivered fuels, more stable heat control, and more convenient heat regulation during filtration.

[0016] By alternately compressing multiple units, the volume of yellow stem fuel can be compressed, thereby increasing its calorific value per unit volume. This allows the blending of yellow stem fuel without modifying the boiler, providing the possibility of blending large quantities of yellow stem fuel in the boiler. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Attachment Figure 1 It is a schematic diagram of the three-dimensional viewing angle structure of the present invention;

[0018] Attachment Figure 2 This is a schematic diagram of the main viewing angle structure of the present invention;

[0019] Attachment Figure 3 This is a schematic diagram of the structure of the present invention from a top view;

[0020] Attachment Figure 4 This is a structural diagram of the compression box of the present invention in non-compression / compression states;

[0021] Attachment Figure 5 This is a schematic diagram of a cross-sectional view of a compression box of the present invention;

[0022] Attachment Figure 6 This is a partial enlarged structural diagram of part A of the present invention;

[0023] The numbers shown in the accompanying drawings are: 1. Main conveyor line; 2. Compression box; 3. Power frame; 4. Adjustment frame; 5. Auxiliary conveyor line; 6. Receiving bin; 7. Mounting frame; 8. Pneumatic shears; 11. Material baffle; 21. Compression chamber; 22. Conical chamber; 23. Partition; 24. Connecting hole; 25. Compression assembly; 26. Compression power unit; 27. Compression channel; 31. Screw feed shaft; 32. Rotating power mechanism; 33. Sizing screw feed piece; 34. Conical feed piece; 35. Guide plate; 41. Conveyor frame; 42. Feed conveyor belt; 43. Linear feed mechanism; 61. Delivering conveyor belt; 62. Limiting plate. DETAILED DESCRIPTION

[0024] The present invention will be further described with reference to the accompanying drawings and specific embodiments. It should be understood that these embodiments are intended only to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the contents of the present invention, those skilled in the art may make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the present application.

[0025] like Figure 1-6 As shown, the present invention describes a biomass ash stalk furnace yellow stalk feeding system, comprising a main conveyor line 1, which is arranged at an angle. The main conveyor line 1 is used to feed materials to the furnace feeder of the biomass boiler. In the prior art, materials are alternately released from the ash stalk silo and the yellow stalk silo to transport fuel into the boiler to complete the mixed combustion of ash stalk fuel and yellow stalk fuel.

[0026] In the present invention, in order to reduce the impact of the low density of yellow stalk fuel on material transportation, the present invention adds a compression system upstream of the main conveying line 1 to compress the yellow stalk fuel to increase its density, thereby reducing the density difference between the yellow stalk fuel and the gray stalk fuel, so that the feeding amount during the feeding process is kept as consistent as possible, reducing the feeding difference of the feeder in front of the furnace, and ensuring the uniformity of feeding and the temperature balance of the boiler. Furthermore, after the yellow stalk is compressed by the compression system, the blocking mechanism can be used to evenly mix the yellow stalk and gray stalk fuels, so that the yellow stalk and gray stalk fuels are fed synchronously according to a certain ratio, thereby ensuring the uniform and continuous transportation of biomass fuel, making the fuel ratio relatively consistent when feeding the boiler, and better ensuring the temperature uniformity of the boiler.

[0027] Specifically, a mounting bracket 7 is provided above the downstream of the main conveyor line 1, and at least two compression boxes 2 are provided on the mounting bracket 7. The compression boxes 2 are arranged longitudinally above the main conveyor line 1. A compression chamber 21 is provided at the top of the compression box 2, and a conical chamber 22 is provided at the bottom of the compression chamber 21. A discharge port is provided at the bottom of the conical chamber 22, and the discharge port serves as the outlet for the compressed yellow-stem fuel. A pneumatic shear 8 is provided below the discharge port, and the pneumatic shear 8 acts alternately to cut off the compressed and extruded yellow-stem fuel. A partition 23 is provided between the compression chamber 21 and the conical chamber 22, and a connecting hole 24 is provided on the partition 23. The connecting hole 24 serves as a connecting hole between the compression chamber 21 and the yellow-stem compressed fuel in the conical chamber 22.

[0028] Compression assemblies 25 are provided on both sides of the compression chamber 21. The compression assemblies 25 have arc surfaces on the sides facing each other. A compression power unit 26 is provided between the compression assembly 25 and the compression chamber 21. When the compression assemblies 25 on both sides are docked, a compression channel 27 is formed between the two compression assemblies 25. The compression channel 27 is a cylindrical channel as a whole. The compression power unit 26 is preferably a hydraulic cylinder, which is driven by the hydraulic cylinder to perform preliminary and rapid extrusion of the yellow-rod fuel introduced therein. More specifically, the compression assembly 25 has chamfers on both sides, so that the two side edges of the compression assembly 25 are blade-shaped, and the two sides of the compression assembly 25 fit the inner wall of the compression box 2. When the two compression assemblies 25 are docked, the yellow-rod fuel can be prevented from being clamped between the two side walls of the two compression assemblies 25, making the formation of the compression channel 27 more stable. The joint between the two compression assemblies 25 after docking is a notch, which is triangular in shape. It can squeeze the yellow-rod fuel toward the compression channel 27, thereby achieving stable docking of the two compression assemblies 25.

[0029] A power frame 3 is provided above the compression box 2. The power frame 3 is fixedly connected to the mounting frame 7. A spiral feed shaft 31 is rotatably mounted on the power frame 3. A rotating power mechanism 32 for driving the spiral feed shaft 31 to rotate is installed on the power frame 3. In the present embodiment, the rotating power mechanism 32 adopts a high-torque hydraulic motor. The hydraulic motor has a low rotation speed, but can burst out a higher torque, thereby more effectively transporting the compressed yellow rod fuel. A sizing spiral feed piece 33 adapted to the compression channel 27 is provided at the top of the spiral feed shaft 31. The diameter of the sizing spiral feed piece 33 is slightly smaller than the inner diameter of the compression channel 27. A conical feed piece 34 that cooperates with the conical cavity 22 is provided at the bottom of the spiral feed shaft 31. In the present embodiment, the conical feed piece 34 fits the inner wall of the conical cavity 22, and the conical cavity 22 is used to limit the conical feed piece 34, thereby ensuring the stable rotation of the spiral feed shaft 31. More specifically, the contact edge of the conical feed piece 34 and the inner wall of the conical cavity 22 is welded with hard alloy. The setting of the hard alloy makes the conical feed piece 34 more wear-resistant, while achieving the far end limit of the spiral feed shaft 31, and improving the service life of the conical feed piece 34.

[0030] Above the mounting frame 7, an adjustment frame 4 is positioned. The adjustment frame 4 can be fixedly connected to the mounting frame 7 or mounted on the ceiling. A conveyor frame 41 is slidably mounted on the adjustment frame 4. Specifically, the adjustment frame 4 has an adjustment rail, and the conveyor frame 41 has a sliding pair that slidably engages the adjustment rail. A feed conveyor belt 42 is mounted on the conveyor frame 41, and a linear feed mechanism 43 is provided on the adjustment frame 4 to drive the conveyor frame 41 back and forth along the adjustment frame 4. Specifically, the linear feed mechanism 43 is a transmission chain mechanism, positioned along the adjustment frame 4, with the chain of the transmission chain mechanism 43 fixedly connected to the conveyor frame 41. The transmission chain mechanism 43 is driven by a servo motor. Driven by the servo motor, the transmission chain mechanism 43 can move the conveyor frame 41 to any position on the adjustment frame 4, thereby transporting the yellow-rod fuel to the various compression tanks 2 below. More specifically, the conveyor frame 41 has drive rollers at both ends, one of which is a motor-driven active roller. The feed conveyor belt 42 is tensioned between the two drive rollers. An auxiliary conveyor line 5 is set above the feed conveyor belt 42. The auxiliary conveyor line 5 is set at an angle. The auxiliary conveyor line 5 is used to convey yellow rod fuel to the feed conveyor belt 42. Through the adjustment of the linear feeding mechanism 43, the feed conveyor belt 42 is driven to convey the yellow rod fuel to any compression box 2.

[0031] More specifically, in order to prevent the feed conveyor belt 42 from interfering with the rotating power mechanism 32 during the transportation of the yellow rod material, the present invention provides a conical guide plate 35 on the top of the power frame 3. The guide plate can protect the rotating power mechanism 32 and at the same time guide the yellow rod material so that it can be smoothly and evenly distributed in the compression box 2.

[0032] In this embodiment, the auxiliary conveyor line 5 and the main conveyor line 1 both use belt feeders. The auxiliary conveyor line 5 is used to convey the yellow stalk fuel such as straw that has been preliminarily crushed.

[0033] A receiving bin 6 is provided below the mounting frame 7. The receiving bin 6 receives the compressed material in each compression box 2, so that the receiving bin 6 serves as a buffer bin for the compressed yellow rod fuel. A lead-out conveyor belt 61 is provided at the bottom of the receiving bin 6. The downstream of the lead-out conveyor belt 61 is located above the main conveyor line 1. A limit plate 62 is provided in the receiving bin 6. The limit plate 62 is slightly higher than the lead-out conveyor belt 61. Specifically, the conveyor belt 61 covers the bottom surface of the receiving bin 6, and the downstream of the conveyor belt 61 extends to the outside of the receiving bin 6. The lead-out conveyor belt 61 is used to transport the compressed yellow rod fuel received in the receiving bin 6 and transport it to the main conveyor line 1 for uniform drop. The limit plate 62 is used to regulate the lead-out flow of the lead-out conveyor belt 61, so that the yellow rod fuel can be evenly led to the gray rod fuel transported on the main conveyor line 1, thereby ensuring a uniform ratio of yellow rod and gray rod fuel.

[0034] Furthermore, a baffle plate 11 is provided downstream of the main conveyor line 1. The bottom of the baffle plate 11 is an arc surface, and there is an acute angle between the baffle plate 11 and the main conveyor line 1. The function of the baffle plate 11 is similar to that of the limit plate 62, both of which limit the material on the conveyor belt. However, the gray rod material particles conveyed on the main conveyor line 1 are relatively large. In this embodiment, the bottom of the baffle plate 11 is designed as an arc surface structure, which cooperates with the shape of the conveyor belt of the main conveyor line 1, so that after passing through the baffle plate 11, the gray rod fuel on the main conveyor line 1 presents an inward concave state with a low middle and high sides, and the outlet conveyor belt 61 continuously releases the compressed yellow rod material onto the concave gray rod. The gray rod fuel with a concave arc surface can better receive the yellow rod compressed fuel discharged by the outlet conveyor belt 61, so that the compressed yellow rod fuel can be stably laid on the gray rod fuel, thereby ensuring the uniform configuration of the gray rod fuel and the yellow rod fuel.

[0035] Specifically, when the gray stalk fuel boiler is mixed with yellow stalk fuel for power generation, the feeding system is used to feed the fuel, which mainly includes the following steps:

[0036] First, the main conveyor line 1 stably conveys the gray-stem fuel, while the auxiliary conveyor line 5 conveys the pre-crushed yellow-stem fuel. The yellow-stem fuel is alternately conveyed to multiple compression boxes 2 via the feed conveyor belt 42. The multiple compression boxes 2 alternately operate, completing the initial compression of the yellow-stem fuel through the compression assembly 25. Subsequently, the spiral feed shaft 31 rotates, and the diameter of the compression channel 27 changes toward the inner diameter of the conical cavity 22, completing the secondary compression of the yellow-stem fuel. The fuel is finally discharged through the discharge port, and the extruded fuel is cut off by the pneumatic shear 8. The compressed and sheared yellow-stem fuel is conveyed by the discharge conveyor belt 61. After the flow rate is controlled by the limit plate 62, it falls evenly onto the main conveyor line 1, achieving the synchronous mixing and feeding of the gray-stem fuel and the yellow-stem fuel, so that the ratio of gray-stem fuel to yellow-stem fuel is constant. The feed flow rate of the boiler's front furnace feeder is uniform, which can ensure the constant calorific value of the boiler fuel, the continuous transportation of the fuel, and the constant temperature of the boiler.

Claims

1. A biomass ash stalk furnace yellow stalk feeding system, comprising a main conveying line (1), wherein the main conveying line (1) is arranged in an inclined manner, and is characterized in that: A mounting frame (7) is provided above the downstream of the main conveying line (1), and at least two compression boxes (2) are provided on the mounting frame (7). The top of the compression box (2) has a compression chamber (21), and a conical chamber (22) is provided at the bottom of the compression chamber (21). The bottom of the conical chamber (22) has a discharge port, and a pneumatic shear (8) is provided below the discharge port. A partition (23) is provided between the compression chamber (21) and the conical chamber (22), and a connecting hole (24) is provided on the partition (23). The compression chamber (21) is provided with a plurality of connecting holes (24). ) are provided on both sides thereof, the compression components (25) are formed into arc surfaces on the sides facing each other, a compression power unit (26) is provided between the compression component (25) and the compression chamber (21), and when the compression components (25) on both sides are docked, a compression channel (27) is formed between the two compression components (25), a power frame (3) is provided above the compression box (2), a screw feeding shaft (31) is rotatably provided on the power frame (3), and a screw feeding shaft for driving the screw feeding shaft is provided on the power frame (3). (31) is provided with a rotating power mechanism (32) for rotating, a sizing spiral feeding piece (33) adapted to the compression channel (27) is provided on the top of the spiral feeding shaft (31), a conical feeding piece (34) adapted to the conical cavity (22) is provided on the bottom of the spiral feeding shaft (31), an adjusting frame (4) is provided above the mounting frame (7), a conveying frame (41) is slidably provided on the adjusting frame (4), a feeding conveyor belt (42) is provided on the conveying frame (41), and a driving conveyor is provided on the adjusting frame (4). A linear feeding mechanism (43) is provided for sliding back and forth along the adjusting frame (4) along the frame (41); an auxiliary conveyor line (5) is provided above the feeding conveyor belt (42); the auxiliary conveyor line (5) is provided at an angle; a receiving bin (6) is provided below the mounting frame (7); a lead-out conveyor belt (61) is provided at the bottom of the receiving bin (6); the downstream of the lead-out conveyor belt (61) is located above the main conveyor line (1); a limit plate (62) is provided in the receiving bin (6); the limit plate (62) is adapted to the lead-out conveyor belt (61).

2. A biomass ash stalk furnace yellow stalk feeding system according to claim 1, characterized in that: A material baffle (11) is provided downstream of the main conveying line (1), the bottom of the material baffle (11) is an arc surface, and an acute angle is formed between the material baffle (11) and the main conveying line (1).

3. The biomass ash stalk furnace yellow stalk feeding system according to claim 1, characterized in that: Both sides of the compression component (25) have chamfers, and both sides of the compression component (25) fit with the inner wall of the compression box (2). When the two compression components (25) are docked, the joint between the two compression components (25) is a notch.

4. The biomass ash stalk furnace yellow stalk feeding system according to claim 1, characterized in that: The inner wall of the conical cavity (22) is fitted with the conical feeding piece (34), and the contact edge between the conical feeding piece (34) and the inner wall of the conical cavity (22) is welded with hard alloy.

5. The biomass ash stalk furnace yellow stalk feeding system according to claim 1, characterized in that: The linear feeding mechanism (43) is a transmission chain mechanism, the transmission chain mechanism (43) is arranged along the adjustment frame (4), and the chain of the transmission chain mechanism (43) is fixedly connected to the conveying frame (41).

6. The biomass ash stalk furnace yellow stalk feeding system according to claim 1, characterized in that: The conveyor belt (61) covers the bottom surface of the material receiving bin (6), and the downstream of the conveyor belt (61) extends to the outside of the material receiving bin (6).

7. The biomass ash stalk furnace yellow stalk feeding system according to claim 1, characterized in that: The compression power unit (26) adopts a hydraulic cylinder, and the rotation power mechanism (32) adopts a high-torque hydraulic motor.

8. The biomass ash stalk furnace yellow stalk feeding system according to claim 2, characterized in that: After the main conveyor line (1) passes through the material blocking plate (11), the gray rod material on the main conveyor line (1) presents a concave state, and the lead-out conveyor belt (61) continuously releases the compressed yellow rod material onto the concave gray rod.

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