Combustion device suitable for blending combustion of biomass particle fuel in coal-fired boiler

Abstract

The utility model relates to the technical field of combustion equipment, and discloses a combustion device suitable for blending combustion of biomass particle fuel of a coal-fired boiler, which comprises a boiler body, one side of the boiler body is communicated with a premixing component, and a fire grate bed body is fixedly connected in the boiler body. A first combustion movable piece and a second combustion movable piece are arranged on the inner wall of the fire grate bed body in a sliding mode, a reciprocating driving assembly is arranged on the fire grate bed body, and a secondary mixing assembly is further arranged in the fire grate bed body. By arranging the reciprocating driving assembly, the first combustion movable piece and the second combustion movable piece can do reciprocating motion in opposite directions so as to push and mix pulverized coal and biomass particles which are preliminarily mixed through the pre-mixing assembly, the secondary mixing assembly is arranged between the pre-combustion area and the main combustion area, and the secondary mixing assembly is arranged between the pre-combustion area and the main combustion area. The pulverized coal and the biomass particles which do not enter the main combustion area can be finally mixed, the blending combustion effect of the pulverized coal and the biomass particles is further improved, and then the combustion efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of combustion equipment, in particular to a combustion device suitable for burning biomass particle fuel in coal-fired boilers. Background Art

[0002] Biomass pellet fuel refers to the burning of biomass materials as fuel, generally mainly agricultural and forestry waste. Since biofuel is a clean and cheap fuel, many companies try to add some biomass pellets to the coal entering the boiler for mixed combustion.

[0003] In coal-fired power plants, biomass pellets can be mixed with pulverized coal and burned to generate electricity. This approach not only improves energy efficiency but also reduces fossil fuel consumption and carbon emissions.

[0004] However, during the co-firing process, the particle shape and size of coal are more complex and diverse, while biomass particles usually have a more regular shape and uniform size, and a smooth surface, which increases the difficulty of mixing the two. This makes it easy for biomass particles to separate during the mixing process with coal powder, affecting the co-firing effect and reducing the combustion efficiency. In order to solve the above problems, we propose a combustion device suitable for the co-firing of biomass pellet fuel in coal-fired boilers. Utility Model Content

[0005] The purpose of the utility model is to provide a combustion device suitable for burning biomass pellet fuel in a coal-fired boiler, so as to solve the problem of reduced combustion efficiency.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a combustion device suitable for burning biomass pellet fuel in a coal-fired boiler, comprising a boiler body, one side of the boiler body is connected to a pre-mixing assembly, a grate bed is fixedly connected to the boiler body, the inner wall of the grate bed is slidingly provided with a first combustion movable piece and a second combustion movable piece, the first combustion movable piece and the second combustion movable piece are staggered, and the grate bed is also provided with a reciprocating drive assembly for driving the first combustion movable piece and the second combustion movable piece to reciprocate in opposite directions, and the grate bed is also provided with a secondary mixing assembly to prevent coal powder from separating from biomass particles, wherein the secondary mixing assembly is connected to the reciprocating drive assembly via a cam assembly.

[0007] According to the above technical solution, the secondary mixing assembly includes mixing and stirring rollers rotating in opposite directions, a mixing trough is provided on the top of the grate bed, the mixing and stirring rollers are arranged in the mixing trough, a combustion fixing plate is provided on the top of the grate bed, the combustion fixing plate is arranged on both sides of the mixing trough, and the mixing and stirring rollers are rotatably connected to the inner wall of the grate bed.

[0008] According to the above technical solution, the reciprocating drive assembly includes a forward thrust member and a reverse thrust member, and the forward thrust member and the reverse thrust member are respectively connected to the two mixing rollers through a cam assembly.

[0009] According to the above technical solution, the cam assembly includes a cam rotatably connected to the side wall of the grate bed, the shaft of the mixing and stirring roller is fixed to the center of the cam side wall, and the side wall of the cam is rotated away from the center of the circle and is provided with a hinged rod, and the hinged rod is connected to the reciprocating drive assembly.

[0010] According to the above technical solution, the reciprocating drive assembly includes a forward thrust member and a reverse thrust member, the forward thrust member includes a first movable frame, the reverse thrust member includes a second movable frame, the first movable frame and the second movable frame are both slidingly connected to the inner wall of the grate bed, the first combustion movable piece is arranged on the first movable frame, the second combustion movable piece is arranged on the second movable frame, and a reverse member is provided between the first movable frame and the second movable frame.

[0011] According to the above technical solution, the reversing member includes a first rack and a second rack, the first rack is fixedly connected to the first movable frame, the second rack is fixedly connected to the second movable frame, and the side wall of the grate bed is rotated to be provided with a gear connected to the external drive, the gear is arranged between the first rack and the second rack, and the gear is respectively engaged with the first rack and the second rack.

[0012] According to the above technical solution, the premixing assembly includes a coal powder conveyor belt and a biomass particle conveyor belt, and a mixing conveyor belt is provided below the outlets of the coal powder conveyor belt and the biomass particle conveyor belt.

[0013] According to the above technical solution, a water spray head is provided above the biomass particle conveyor belt.

[0014] According to the above technical solution, the biomass particle conveyor belt is a skirt baffle conveyor belt, and the side wall of the baffle of the skirt baffle conveyor belt is provided with drainage holes.

[0015] According to the above technical solution, a sedimentation box is provided on the other side of the boiler body, and the sedimentation box is connected to the smoke exhaust pipe of the boiler body. The bottom of the sedimentation box is connected to a return pipe, and the return pipe passes through the side wall of the boiler body and extends to the upper part of the grate bed.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] The utility model is provided with a reciprocating drive component, which can make the first combustion movable piece and the second combustion movable piece staggered with each other reciprocate in opposite directions, so as to promote the mixing of the coal powder and the biomass particles that are preliminarily mixed by the premixing component, thereby improving the mixing efficiency and the co-combustion effect of the coal powder and the biomass particles, and thus improving the combustion efficiency. The secondary mixing component is arranged between the pre-combustion zone and the main combustion zone, and can perform the final mixing, i.e., the secondary mixing, of the coal powder and the biomass particles that have not entered the main combustion zone, further making the coal powder and the biomass particles mixed evenly, improving the mixing efficiency and the co-combustion effect of the coal powder and the biomass particles, and thus improving the combustion efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the boiler body of the utility model;

[0019] Figure 2 It is a schematic diagram of the combustion device of the coal-fired boiler of the utility model;

[0020] Figure 3 It is a schematic diagram of the reciprocating drive assembly and the secondary mixing assembly of the utility model;

[0021] Figure 4 It is a schematic diagram of the cam of the utility model;

[0022] Figure 5 It is a schematic diagram of the pre-mixing component of the utility model.

[0023] In the picture:

[0024] 1. Boiler body; 2. Pre-mixing assembly; 21. Pulverized coal conveyor belt; 22. Biomass pellet conveyor belt; 23. Mixing conveyor belt; 24. Water spray head; 3. Grate bed; 4. First combustion movable plate; 5. Second combustion movable plate; 6. Reciprocating drive assembly; 61. Forward thrust member; 611. First movable frame; 62. Reverse thrust member; 621. Second movable frame; 63. Reverse member; 631. First rack; 632. Second rack; 633. Gear; 7. Secondary mixing assembly; 71. Mixing and stirring roller; 72. Combustion fixed plate; 8. Cam assembly; 81. Cam; 82. Articulated rod; 9. Settling box; 10. Return pipe. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0026] See also Figure 1-5 The utility model provides a technical solution of a combustion device suitable for burning biomass pellet fuel in a coal-fired boiler: it includes a boiler body 1, one side of the boiler body 1 is connected to a pre-mixing component 2 for uniformly mixing coal powder and biomass particles to improve combustion efficiency, the inner bottom wall of the boiler body 1 is fixedly connected to a grate bed 3, the inner wall of the grate bed 3 is slidingly provided with a first combustion movable piece 4 and a second combustion movable piece 5, the first combustion movable piece 4 and the second combustion movable piece 5 are staggered, and adjacent first combustion movable pieces 4 and second combustion movable pieces 5 are movably connected, and a reciprocating drive component 6 for driving the first combustion movable piece 4 and the second combustion movable piece 5 to reciprocate in opposite directions is further provided on the grate bed 3, so that the first combustion movable piece 4 and the second combustion movable piece 5 can transmit the fuel thereon and ensure the continuity of the movement of the first combustion movable piece 4 and the second combustion movable piece 5.

[0027] When the staggered first combustion movable pieces 4 and the second combustion movable pieces 5 move in opposite directions, the pulverized coal and the biomass particles can be pushed and mixed, thereby improving the mixing efficiency and the blending effect of the pulverized coal and the biomass particles, and thus improving the combustion efficiency.

[0028] The grate bed 3 is divided into a pre-combustion zone, a main combustion zone and a burnout zone. A secondary mixing component 7 is also provided in the grate bed 3 to prevent the separation of coal powder and biomass particles. The secondary mixing component 7 is arranged between the pre-combustion zone and the main combustion zone. Through the setting of the secondary mixing component 7, the coal powder and biomass particles that have not entered the main combustion zone can be finally mixed, that is, secondary mixing, to further make the coal powder and biomass particles mixed evenly, improve the mixing efficiency and blending effect of coal powder and biomass particles, and thus improve the combustion efficiency.

[0029] The secondary mixing assembly 7 is connected to the reciprocating drive assembly 6 through the cam assembly 8. The reciprocating drive assembly 6 can drive the mixing output end of the secondary mixing assembly 7 to rotate through the cam assembly 8 to mix the coal powder that has not entered the main combustion zone with the biomass particles.

[0030] Specifically, the secondary mixing assembly 7 includes mixing and stirring rollers 71 rotating in opposite directions. A mixing tank is provided on the top of the grate bed 3. The mixing and stirring rollers 71 are arranged in the mixing tank. The two mixing and stirring rollers 71 rotating in opposite directions rotate in the mixing tank, and the pulverized coal and biomass particles that have not entered the main combustion zone can be finally mixed.

[0031] A combustion fixing plate 72 is provided on the top of the grate bed 3, and the combustion fixing plate 72 is arranged on both sides of the mixing tank. The front combustion fixing plate 72 can receive the coal powder and biomass particles pushed out by the front first combustion movable plate 4, and the rear combustion fixing plate 72 can receive the coal powder and biomass particles mixed and stirred by the mixing and stirring roller 71. The mixing and stirring roller 71 is rotatably connected to the inner wall of the grate bed 3.

[0032] Specifically, the reciprocating drive assembly 6 includes a forward thrust member 61 and a reverse thrust member 62. The forward thrust member 61 and the reverse thrust member 62 move in opposite directions. The forward thrust member 61 and the reverse thrust member 62 are respectively connected to the two mixing and stirring rollers 71 through the cam assembly 8, so that the two mixing and stirring rollers 71 rotate in opposite directions to each other.

[0033] Specifically, the cam assembly 8 includes a cam 81 rotatably connected to the side wall of the grate bed 3, and the shaft of the mixing and stirring roller 71 is fixedly connected to the center of the side wall of the cam 81, so that the cam 81 and the mixing and stirring roller 71 rotate synchronously. The side wall of the cam 81 rotates away from the center of the circle and is provided with a hinged rod 82. The hinged rod 82 is connected to the reciprocating drive assembly 6. The reciprocating drive assembly 6 can drive the hinged rod 82 to move back and forth linearly away from one end of the cam 81, thereby driving the rotation of the cam 81.

[0034] Specifically, the reciprocating drive assembly 6 includes a forward push member 61 and a reverse push member 62. The forward push member 61 includes a first movable frame 611, and the reverse push member 62 includes a second movable frame 621. The first movable frame 611 and the second movable frame 621 are both slidably connected to the inner wall of the grate bed 3. The first combustion movable piece 4 is arranged on the first movable frame 611, and the second combustion movable piece 5 is arranged on the second movable frame 621. The first movable frame 611 and the second movable frame 621 can respectively drive the first combustion movable piece 4 and the second combustion movable piece 5 thereon to perform reciprocating linear motion. A reverse member 63 is provided between the first movable frame 611 and the second movable frame 621. Through the provided reverse member 63, the movement directions of the first movable frame 611 and the second movable frame 621 can be made opposite, thereby making the first combustion movable piece 4 and the second combustion movable piece 5 perform reciprocating motion in opposite directions, so as to transmit the fuel thereon and ensure the continuity of the movement of the first combustion movable piece 4 and the second combustion movable piece 5.

[0035] Specifically, the reversing member 63 includes a first rack 631 and a second rack 632. The first rack 631 is fixedly connected to the first movable frame 611, and the second rack 632 is fixedly connected to the second movable frame 621. The side wall of the grate bed 3 is rotatably provided with a gear 633 connected to an external drive. The gear 633 is arranged between the first rack 631 and the second rack 632, and the gear 633 is respectively engaged with the first rack 631 and the second rack 632. The external drive can be a motor. The external drive can rotate the gear 633, thereby causing the first rack 631 and the second rack 632 located on both sides of the gear 633 to move in opposite directions, thereby driving the first movable frame 611 and the second movable frame 621 to move in opposite directions, so as to realize the first combustion movable piece 4 and the second combustion movable piece 5 to reciprocate in opposite directions;

[0036] Specifically, the premixing assembly 2 includes a coal powder conveyor belt 21 and a biomass particle conveyor belt 22. The coal powder conveyor belt 21 and the biomass particle conveyor belt 2 are respectively used to transport the coal powder and the biomass particles. A mixing conveyor belt 23 is provided below the outlets of the coal powder conveyor belt 21 and the biomass particle conveyor belt 22. The transported coal powder and biomass particles will fall together on the mixing conveyor belt 23 to achieve preliminary mixing of the coal powder and the biomass particles.

[0037] Specifically, a water spray head 24 is provided above the biomass particle conveyor belt 22, which can humidify the biomass particles on the biomass particle conveyor belt 22, thereby increasing the adhesion of the surface of the biomass particles for subsequent uniform mixing, and preventing the difficulty in mixing the two, resulting in the separation of coal powder and biomass particles, which affects the effect of co-combustion.

[0038] Specifically, the biomass pellet conveyor belt 22 is a skirt baffle conveyor belt, which facilitates the transportation of biomass pellets. Drain holes are provided on the side plates of the skirt baffle conveyor belt to prevent excessive water from accumulating on the biomass pellet conveyor belt 22, causing the biomass pellets to be over-wet and affecting the combustion efficiency.

[0039] Specifically, a sedimentation box 9 is provided on the other side of the boiler body 1, and the sedimentation box 9 is connected to the smoke exhaust pipe of the boiler body 1. The flue gas entering the sedimentation box 9 through the smoke exhaust pipe of the boiler body 1 can be settled in the sedimentation box 9. The large particles of incomplete combustion will fall to the bottom of the sedimentation box 9, and the small particles will be discharged upward from the sedimentation box 9. The bottom of the sedimentation box 9 is connected to a return pipe 10. The return pipe 10 passes through the side wall of the boiler body 1 and extends to the upper part of the grate bed 3. The large particles of incomplete combustion that settle to the bottom of the sedimentation box 9 can be sent back to the grate bed 3 (main combustion area) through the return pipe 10 to participate in combustion, thereby improving energy utilization.

[0040] In the description of the present invention, it should be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inside", "front", "center", "two ends", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0041] In addition, the terms "first", "second", "third" and "fourth" are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second", "third" and "fourth" may explicitly or implicitly include at least one such feature.

[0042] In the present invention, unless otherwise clearly stipulated and limited, the terms "install", "set", "connect", "fix", "screw" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the present invention according to the specific circumstances.

[0043] Although the 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 variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A combustion device suitable for burning biomass pellet fuel in a coal-fired boiler, comprising a boiler body (1), characterized in that: One side of the boiler body (1) is connected to a pre-mixing assembly (2), a grate bed (3) is fixedly connected to the boiler body (1), a first combustion movable piece (4) and a second combustion movable piece (5) are slidably provided on the inner wall of the grate bed (3), the first combustion movable piece (4) and the second combustion movable piece (5) are arranged alternately, a reciprocating drive assembly (6) for driving the first combustion movable piece (4) and the second combustion movable piece (5) to reciprocate in opposite directions is further provided on the grate bed (3), a secondary mixing assembly (7) for preventing coal powder from separating from biomass particles is further provided in the grate bed (3), wherein the secondary mixing assembly (7) is connected to the reciprocating drive assembly (6) via a cam assembly (8).

2. A combustion device suitable for burning biomass pellet fuel in a coal-fired boiler according to claim 1, characterized in that: The secondary mixing assembly (7) includes mixing and stirring rollers (71) rotating in opposite directions, a mixing trough is provided on the top of the grate bed (3), the mixing and stirring rollers (71) are arranged in the mixing trough, a combustion fixing plate (72) is provided on the top of the grate bed (3), the combustion fixing plates (72) are arranged on both sides of the mixing trough, and the mixing and stirring rollers (71) are rotatably connected to the inner wall of the grate bed (3).

3. The combustion device for coal-fired boilers mixed with biomass pellet fuel according to claim 2, characterized in that: The reciprocating drive assembly (6) comprises a forward thrust member (61) and a reverse thrust member (62), and the forward thrust member (61) and the reverse thrust member (62) are respectively connected to two mixing and stirring rollers (71) via a cam assembly (8).

4. The combustion device for coal-fired boilers mixed with biomass pellet fuel according to claim 2, characterized in that: The cam assembly (8) includes a cam (81) rotatably connected to the side wall of the grate bed (3); the shaft of the mixing roller (71) is fixedly connected to the center of the side wall of the cam (81); the side wall of the cam (81) is rotatably provided with a hinged rod (82) away from the center of the circle; and the hinged rod (82) is connected to the reciprocating drive assembly (6).

5. The combustion device for coal-fired boilers mixed with biomass pellet fuel according to claim 1, characterized in that: The reciprocating drive assembly (6) includes a forward push member (61) and a reverse push member (62), the forward push member (61) includes a first movable frame (611), the reverse push member (62) includes a second movable frame (621), the first movable frame (611) and the second movable frame (621) are both slidably connected to the inner wall of the grate bed (3), the first combustion movable piece (4) is arranged on the first movable frame (611), the second combustion movable piece (5) is arranged on the second movable frame (621), and a reverse member (63) is provided between the first movable frame (611) and the second movable frame (621).

6. The combustion device for coal-fired boilers mixed with biomass pellet fuel according to claim 5, characterized in that: The reverse member (63) includes a first rack (631) and a second rack (632), wherein the first rack (631) is fixedly connected to the first movable frame (611), and the second rack (632) is fixedly connected to the second movable frame (621). The side wall of the grate bed (3) is rotatably provided with a gear (633) connected to an external drive, wherein the gear (633) is arranged between the first rack (631) and the second rack (632), and the gear (633) is respectively engaged with the first rack (631) and the second rack (632).

7. The combustion device for coal-fired boilers mixed with biomass pellet fuel according to claim 1, characterized in that: The premixing assembly (2) comprises a coal powder conveyor belt (21) and a biomass particle conveyor belt (22), and a mixing conveyor belt (23) is provided below the outlets of the coal powder conveyor belt (21) and the biomass particle conveyor belt (22).

8. The combustion device for coal-fired boilers mixed with biomass pellet fuel according to claim 7, characterized in that: A water spray head (24) is provided above the biomass particle conveyor belt (22).

9. The combustion device for coal-fired boilers mixed with biomass pellet fuel according to claim 8, characterized in that: The biomass particle conveyor belt (22) is a skirt baffle conveyor belt, and drainage holes are provided on the baffle plates of the skirt baffle conveyor belt.

10. The combustion device for coal-fired boilers mixed with biomass pellet fuel according to claim 1, characterized in that: A sedimentation box (9) is provided on the other side of the boiler body (1), and the sedimentation box (9) is connected to the smoke exhaust pipe of the boiler body (1). The bottom of the sedimentation box (9) is connected to a return pipe (10), and the return pipe (10) passes through the side wall of the boiler body (1) and extends to the upper part of the grate bed (3).

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