Fluidized bed furnace

Abstract

The utility model discloses a fluidized bed furnace which comprises a furnace body, wherein the furnace body is positioned on a vertical wall on the left side in a main hearth and is provided with a coal sliding pipe which inclines downwards; a sieve plate is obliquely and fixedly arranged on one side of the coal slipping pipe, a plurality of protruding teeth are fixed to one end of the sieve plate, a round roller is rotationally arranged in the coal slipping pipe, a plurality of gears are fixed to the round roller, the gears and the protruding teeth are arranged in a crossed and spaced mode, a baffle is obliquely and fixedly arranged in the coal slipping pipe, and a motor is fixedly installed on the outer wall of the furnace body. An output shaft of the motor is fixedly connected with one end of the round roller; the sieve plate is used for screening fire coal with the particle size larger than 10 mm, the fire coal with the particle size larger than 10 mm directly slides downwards into gaps along the inclined face of the sieve plate to be extruded and crushed to achieve fire coal with the particle size smaller than 10 mm, it is guaranteed that the particle size of the fire coal entering the coal sliding pipe meets the normal specification, and therefore the fire coal can be evenly dispersed under the action of the air bellow in the furnace; and the phenomena of deposition and cold ash (sediment) in the furnace are avoided, and accidents are reduced.

Description

Technical field:

[0001] The utility model relates to the technical field of fluidized bed furnaces, in particular to a fluidized bed furnace. Background technology:

[0002] A fluidized bed furnace is a type of coke preparation equipment that uses fluidization technology to heat pulverized coal. It is also called a fluidized bed heating furnace. The equipment can also be used to dry distill high-volatile non-sticky or weakly sticky pulverized coal to prepare hot charcoal powder as a raw material and solid heat carrier for hot-pressed coke technology. There are two types of fluidized bed furnaces: external combustion and internal heating type and internal combustion and internal heating type. The fluidized bed furnace uses external hot exhaust gas or hot exhaust gas generated by the combustion of part of the pulverized coal in the furnace as a fluidizing medium. The fluidizing medium passes through the pulverized coal layer, causing the coal particles to be in a suspended motion state and undergoing gas-solid heat exchange. In the gas-solid fluidized bed, the movement of the solid particles is like a boiling liquid. Due to the small size of the coal particles and the large surface area, the gas and solid phases move violently relative to each other, resulting in a fast heat transfer rate, which can quickly heat the pulverized coal to the required temperature.

[0003] The furnace wall of the fluidized bed furnace is provided with a coal chute, through which coal is supplied to the furnace cavity. The coal particle size refers to the size and distribution of fuel particles under air distribution, usually expressed in particle size. Generally speaking, the particle size of fluidized bed furnace coal ranges from 1 to 10 mm, of which 5 to 10 mm is the main particle size.

[0004] The current problem is: during operation, if the particle size is larger than 10mm, the wind speed of the bellows will be lower than the wind speed required by the average particle size in the furnace, and the large particles of coal cannot be evenly dispersed to other areas in the furnace, making it easy for the large particles of coal to settle at the feed point in the furnace, forming cold ash (slag), affecting the deterioration of the boiling conditions in the furnace and making accidents prone to occur. Utility model content:

[0005] The purpose of the utility model is to provide a boiling furnace to solve the problems raised in the above background technology.

[0006] The utility model is implemented by the following technical solutions:

[0007] A boiling furnace comprises a furnace body, wherein an air distribution plate and an air hood are arranged at the bottom of the main furnace of the furnace body, and the air hood is arranged on the air distribution plate; a coal chute inclined downward is arranged on the vertical wall on the left side of the furnace body in the main furnace; a sieve plate is obliquely fixedly arranged on the inner surface of the coal chute close to the vertical wall, and a plurality of convex teeth are evenly fixed on the surface of the downward inclined end of the sieve plate; a round roller is rotatably arranged on the inner surface of the side of the coal chute away from the vertical wall, and a plurality of gears for crushing are evenly fixed on the round roller, and the plurality of gears and the plurality of convex teeth are arranged crosswise and at intervals with each other; a baffle is obliquely fixedly arranged on the inner surface of the side of the coal chute away from the vertical wall, and the downward inclined end of the baffle is located above the gear; a motor is fixedly installed on the outer wall of the furnace body, and the output shaft of the motor is fixedly connected to one end of the round roller.

[0008] Preferably, the structure of the vertical wall is divided into high-aluminum refractory bricks, lightweight thermal insulation castables and red bricks in sequence from inside the furnace to outside the furnace, a ring beam is embedded between the high-aluminum refractory bricks and the lightweight thermal insulation castable, the ring beam is filled with high-strength corrosion-resistant and wear-resistant castable, and a heat-resistant steel grid is also fixedly arranged in the ring beam. The heat-resistant steel grid is fixedly connected to the high-aluminum refractory bricks, lightweight thermal insulation castables, red bricks and coal chute by heat-resistant steel anchor reinforcement.

[0009] Preferably, the diameter of the sieve holes of the sieve plate is 10 mm.

[0010] Preferably, there are gaps between the multiple convex teeth and the multiple gears that are arranged crosswise and spaced apart from each other, and the distance of the gaps is 10 mm.

[0011] The utility model has the advantages that: the coal with a particle size larger than 10 mm is first screened by the sieve plate, and the coal directly falls to the bottom of the coal chute into the furnace body; the coal with a particle size larger than 10 mm directly slides down the inclined surface of the sieve plate into the gap, so that the coal with a particle size larger than 10 mm is squeezed and crushed by the interaction between the gear and the convex teeth, and the coal with a particle size smaller than 10 mm is obtained again, and directly falls to the bottom of the coal chute into the furnace body along the gap, so that the coal can be evenly dispersed in the furnace under the action of the bellows, avoiding the occurrence of deposition and cold ash (slag) in the furnace, and reducing the occurrence of accidents. Description of the drawings:

[0012] Figure 1 It is a partial structural cross-sectional view of the utility model in the top view direction;

[0013] Figure 2 for Figure 1 A cross-sectional view of the A direction;

[0014] Figure 3 for Figure 2 The enlarged view of point B in the middle;

[0015] Figure 4 It is a partial structural schematic diagram of the utility model.

[0016] In the figure: 1. furnace body, 2. air distribution plate, 3. hood, 4. vertical wall, 4.1. high-alumina refractory brick, 4.2. lightweight thermal insulation castable, 4.3. red brick, 4.4. ring beam, 4.5. high-strength anti-corrosion and wear-resistant castable, 4.6. heat-resistant steel grid, 4.7. heat-resistant steel anchor reinforcement, 5. coal chute, 6. sieve plate, 6.1. convex teeth, 7. round roller, 8. gear, 9. baffle, 10. motor. Specific implementation method:

[0017] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0018] See also Figure 1-4 , the utility model provides a boiling furnace technical solution:

[0019] A fluidized bed furnace comprises a furnace body 1, wherein an air distribution plate 2 and an air hood 3 are arranged at the bottom of the main furnace of the furnace body 1, and the air hood 3 is arranged on the air distribution plate 2. A coal chute 5 inclined downward is arranged on the vertical wall 4 on the left side of the furnace body 1 in the main furnace; a sieve plate 6 is obliquely fixedly arranged on the inner surface of the coal chute 5 close to the vertical wall 4, and a plurality of convex teeth 6.1 are evenly fixed on the surface of one end of the sieve plate 6 inclined downward. The diameter of the sieve hole of the sieve plate 6 is 10 mm, and the input coal powder can be screened, and the coal with a particle size less than 10 mm can be screened by the sieve plate 6 and directly fall to the bottom of the coal chute 5 and enter the furnace body 1; and the coal with a particle size greater than 10 mm can directly slide down along the inclined surface of the sieve plate 6.

[0020] A round roller 7 is rotatably provided on the inner surface of the side of the chute 5 away from the vertical wall 4, and a baffle 9 is obliquely fixedly provided on the inner surface of the side of the chute 5 away from the vertical wall 4. The end of the baffle 9 obliquely downward is located above the gear 8 to prevent the burning coal from impacting the gear 8 and to protect it. A motor 10 is fixedly installed on the outer wall of the furnace body 1, and the output shaft of the motor 10 is fixedly connected to one end of the round roller 7. A plurality of gears 8 for crushing are evenly fixed on the round roller 7, and the plurality of gears 8 and the plurality of convex teeth 6.1 are arranged crosswise and at intervals, and there are gaps between the plurality of convex teeth 6.1 and the plurality of gears 8 arranged crosswise and at intervals, and the distance of the gaps is 10 mm; coal particles with a diameter greater than 10 mm will slide into the gaps between the plurality of convex teeth 6.1 and the plurality of gears 8, and as the gears 8 on the round roller 7 rotate downward clockwise relative to the convex teeth 6.1, the coal particles with a diameter greater than 10 mm are squeezed and crushed by the interaction between the gears 8 and the convex teeth 6.1, and the coal particles with a diameter less than 10 mm are again obtained, and they directly fall through the gaps to the bottom of the coal chute 5 and enter the furnace body 1, so that the coal can be evenly dispersed in the furnace under the action of the bellows, thereby avoiding the phenomenon of deposition and formation of cold ash (slag) in the furnace.

[0021] The structure of the vertical wall 4 is divided into high-aluminum refractory bricks 4.1, lightweight thermal insulation castables 4.2 and red bricks 4.3 in sequence from the inside of the furnace to the outside of the furnace. A ring beam 4.4 is embedded between the high-aluminum refractory bricks 4.1 and the lightweight thermal insulation castables 4.2. The ring beam 4.4 is filled with high-strength anti-corrosion and wear-resistant castables 4.5. A heat-resistant steel grid 4.6 is also fixedly arranged in the ring beam 4.4. The heat-resistant steel grid 4.6 fixes the high-aluminum refractory bricks 4.1, the lightweight thermal insulation castables 4.2, the red bricks 4.3 and the coal chute 5 together through heat-resistant steel anchor bars 4.7.

[0022] The working principle is as follows: the sieve plate 6 is used to first screen the coal with a particle size greater than 10 mm, and the coal directly falls to the bottom of the coal chute 5 into the furnace body 1; the coal with a particle size greater than 10 mm directly slides down the inclined surface of the sieve plate 6 into the gap, so that the coal with a particle size greater than 10 mm is squeezed and crushed through the interaction between the gear 8 and the convex tooth 6.1, and the coal with a particle size less than 10 mm is again obtained, and directly falls to the bottom of the coal chute 5 into the furnace body 1 along the gap, so that the coal can be evenly dispersed in the furnace under the action of the bellows, avoiding the occurrence of deposition and cold ash (slag) in the furnace, and reducing the occurrence of accidents.

[0023] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A fluidized bed furnace, comprising a furnace body (1), wherein an air distribution plate (2) and an air cap (3) are arranged at the bottom of a main furnace of the furnace body (1), wherein the air cap (3) is arranged on the air distribution plate (2), and a coal chute (5) inclined downward is arranged on a vertical wall (4) on the left side of the main furnace of the furnace body (1); characterized in that: A sieve plate (6) is fixedly and obliquely arranged on the inner surface of the side close to the vertical wall (4) in the coal chute (5), and a plurality of convex teeth (6.1) are evenly fixedly arranged on the surface of one end of the sieve plate (6) that is inclined downward. A round roller (7) is rotatably arranged on the inner surface of the side away from the vertical wall (4) in the coal chute (5), and a plurality of gears (8) for crushing are evenly fixed on the round roller (7). The plurality of gears (8) and the plurality of convex teeth (6.1) are arranged in an intersecting manner. A baffle plate (9) is fixedly and obliquely arranged on the inner surface of the side away from the vertical wall (4) in the coal chute (5), and one end of the baffle plate (9) that is inclined downward is located above the gear (8). A motor (10) is fixedly installed on the outer wall of the furnace body (1), and the output shaft of the motor (10) is fixedly connected to one end of the round roller (7).

2. A boiling furnace according to claim 1, characterized in that: The structure of the vertical wall (4) is divided into high-aluminum refractory bricks (4.1), lightweight thermal insulation castables (4.2) and red bricks (4.3) in sequence from the inside of the furnace to the outside of the furnace. A ring beam (4.4) is embedded between the high-aluminum refractory bricks (4.1) and the lightweight thermal insulation castables (4.2). The ring beam (4.4) is filled with high-strength anti-corrosion and wear-resistant castables (4.5). A heat-resistant steel grid (4.6) is also fixedly arranged in the ring beam (4.4). The heat-resistant steel grid (4.6) fixes the high-aluminum refractory bricks (4.1), the lightweight thermal insulation castables (4.2), the red bricks (4.3) and the coal chute (5) together through heat-resistant steel anchor bars (4.7).

3. A boiling furnace according to claim 1, characterized in that: The diameter of the sieve holes of the sieve plate (6) is 10 mm.

4. A boiling furnace according to claim 1, characterized in that: There are gaps between the plurality of convex teeth (6.1) and the plurality of gears (8) which are arranged in a cross-like manner and at intervals, and the distance of the gaps is 10 mm.

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