Bottom air blowing device for biomass boiler grate

Abstract

The utility model discloses a biomass boiler grate bottom air blowing device which is characterized in that a rocker air regulator is arranged at the center line of an air collecting pipe, one end of a telescopic rod of the rocker air regulator is in threaded connection with a threaded sleeve installed on an outer side plate of an air duct, an air plate is installed at the other end of the telescopic rod, and the air plate located in the air duct is aligned with an air opening of the air collecting pipe; bottom air of the fire grate enters the air flue, enters the air collecting pipe from the two ends of the air collecting pipe and is strongly sprayed out from the blowing nozzle connected with the air collecting pipe, the air force is more concentrated, the penetrating power is higher, it is guaranteed that fuel is fully combusted, black smoke is avoided, the combustion effect of the boiler is better, and the heat efficiency is higher.

Description

Technical Field

[0001] The utility model relates to boiler combustion equipment, in particular to a biomass boiler grate bottom air supply device. Technical Background

[0002] Biomass boilers burn biomass fuel, which is a green, environmentally friendly, renewable energy source. It is a new type of fuel that the country is currently vigorously advocating and promoting. Biomass fuel is taken from various agricultural and forestry wastes such as crop straw, wood chips, sawdust, rice husks, etc. Generally, biomass raw materials such as straw and wood need to be cut or crushed to reduce their size and regularize their shape, so as to facilitate transportation and feeding. The biomass fuel after cutting and crushing has a loose texture and a small bulk density. In order to ensure its feed amount and meet the rated load of the biomass boiler, the material layer height on the grate of its combustion equipment is required to be relatively high, sometimes even as high as 500mm or more. The high material layer requires a strong high-pressure grate bottom wind to penetrate the material layer and fully assist the combustion of the fuel.

[0003] At present, conventional biomass boilers on the market have only increased the blower pressure on the basis of the grate bottom wind separation wind chamber to increase the grate bottom wind pressure and enhance its blowing force and penetration power in response to the objective existence of the high material layer height. This has also achieved certain results, but the air distribution area of ​​the entire boiler grate is large, and the air distribution area of ​​the wind chamber requiring high air pressure is still too large. The wind force is not concentrated enough, and even if the air pressure is increased, its penetration is still insufficient. It is very easy to have problems such as incomplete fuel combustion, black smoke, poor combustion effect and low boiler thermal efficiency, causing environmental pollution and energy waste. Summary of the invention

[0004] The utility model is proposed to solve the above problems and provides a biomass boiler grate bottom wind injection device with concentrated wind force, strong penetration, full fuel combustion, no black smoke, good combustion effect and high boiler thermal efficiency.

[0005] The technical solution adopted by the utility model to solve the above-mentioned problem is as follows: a biomass boiler grate bottom air blowing device includes an air collecting pipe and a blowing nozzle, the air collecting pipe is arranged on the inner side plate of the air duct, a rocker air regulator is arranged at the center line of the air collecting pipe, and the rocker air regulator is composed of at least a telescopic rod, a screw sleeve and an air plate, one end of the telescopic rod is threadedly connected to the screw sleeve installed on the outer side plate of the air duct, and the other end of the telescopic rod is installed with the air plate, and the air plate located in the air duct is aligned with the air outlet of the air collecting pipe.

[0006] Furthermore, the threaded sleeve fixedly mounts a flange, and the flange is mounted on an outer side plate of the air duct.

[0007] Furthermore, a shaking handle is fixedly mounted on the threaded end of the telescopic rod, and the shaking handle is located outside the outer side plate of the air duct.

[0008] After the implementation of the above technical scheme, the utility model has the following good effects compared with the existing conventional technology: in view of the objective factor that the high fuel material layer of the biomass boiler grate is unfavorable to combustion, the conventional technology only increases the air pressure of the blower to increase the grate bottom wind pressure and enhance its blowing force and penetration, but each wind partition chamber still maintains the bottom wind to cover the entire wind chamber, and the ventilation area is too large, resulting in insufficient wind concentration. Even if the wind pressure is increased, its penetration is still insufficient and the combustion effect is also poor; the biomass boiler grate bottom wind blowing device is to increase the bottom wind wind pressure Based on the original technology of pressure reduction, it replaces the original grate bottom air blasting mode, and improves it from decentralized blasting to centralized injection blasting. The grate bottom air pressurized by the blower enters the air duct and enters the air collecting pipe from both ends of the air collecting pipe, and is strongly ejected from the injection nozzle connected to the air collecting pipe. The wind force is more concentrated and the penetration is stronger, ensuring full combustion of the fuel without black smoke, better boiler combustion effect and higher thermal efficiency. The device is very convenient for air adjustment and ash cleaning. After using this device, the boiler thermal efficiency can be increased by more than 3% compared with conventional biomass boilers. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 This is a schematic diagram of the structure of the grate and air duct of the biomass boiler.

[0010] Figure 2 for Figure 1 Side view of the grate in the.

[0011] Figure 3 It is a structural schematic diagram of the grate bottom air blowing device.

[0012] Figure 4 It is a three-dimensional diagram of the grate bottom air blowing device.

[0013] Figure 5 It is a stereoscopic view of another embodiment of the grate bottom air blowing device. DETAILED DESCRIPTION

[0014] like Figure 1 and 2 As shown, the biomass boiler grate bottom wind blowing device is mainly composed of a blowing nozzle 1, an air collecting pipe 2 and an air regulator 3. The entire grate bottom wind blowing device is installed at the bottom of the biomass boiler grate 5. Multiple blowing devices can be arranged as needed to replace the original grate bottom wind blowing method. Each device includes a large number of blowing nozzles 1, an air collecting pipe 2 and two air regulators 3. A large number of blowing nozzles 1 are welded on the air collecting pipe 2, and the nozzles are vertically upward. The air outlets at both ends of the air collecting pipe 2 are adjacent to an air regulator 3, and the center lines of the air collecting pipe 2 and the air regulator 3 are aligned. The air collecting pipe 2 is fixed on the inner plate of the air duct 6, and the air regulator 3 is fixed on the outer plate 6.1 of the air duct. The air outlet of the air collecting pipe is connected to the air duct.

[0015] The nozzle 1 is a square structure, made of heat-resistant stainless steel square tube, the size of the square tube (i.e. nozzle) is 30×30~70×70mm, this size can ensure that the nozzle is large enough, not blocked by falling dust, and at the same time not too large, to ensure wind concentration, its height above the air collecting pipe 2 is 50~80mm, and the wall thickness is 4mm. The spacing between each nozzle 1 is 80~120mm, and the material of heat-resistant stainless steel makes it resistant to high temperature and has a long service life.

[0016] The air collecting pipe 2 is a circular steel pipe with an outer diameter of D=Φ159~426mm (D is the diameter of the air collecting pipe). A large number of square holes are opened on the top of the air collecting pipe 2, and the nozzle 1 is inserted into the square holes and welded and fixed. A circular hole is opened at the contact point between the inner plate of the air duct and the air collecting pipe 2. The air collecting pipe 2 extends from the opening to a height of about 5m and is spot welded and fixed to the inner plate of the air duct.

[0017] like Figure 3 and Figure 4 As shown, the rocker air regulator 3 is an independent integral component. The air regulator 3 is composed of five parts, namely, an air plate 31, a telescopic rod 32, a screw sleeve 33, a flange 35 and a shaking handle 34, which are connected to form an integral body. All parts are made of steel. The front end of the telescopic rod fixes the air plate, and the rear end fixes the shaking handle. The screw sleeve is fixed on the flange. The flange is fixed on the outer plate of the air duct with fixing screws to support the weight of the entire air regulator. The telescopic rod has an external thread, and the screw sleeve has an internal thread. The telescopic rod is sleeved in the screw sleeve. During operation, the shaking handle can be rotated according to actual conditions, and the telescopic rod can be extended and retracted in the fixed screw sleeve to drive the air plate forward or backward, and the distance between the air plate and the port of the air collecting pipe, i.e., the air inlet, is adjusted, thereby adjusting the air volume and wind force of the blowing pipe.

[0018] The wind plate 31 is located inside the air duct 6. The wind plate 31 is a circular steel plate with a thickness of 4 to 6 mm and a diameter of D+20 mm. The center of the wind plate 31 is aligned with the telescopic rod 32 and is welded and fixed to the front end of the telescopic rod 32. The telescopic rod 32 extends into the air duct 6. The telescopic rod 32 is made of round steel with a diameter of φ24 to 36 mm. The tail of the telescopic rod 32 is sleeved in the screw sleeve 33 and the M24 to 36 mm external thread is opened. The screw sleeve 33 is made of round steel with a diameter of φ45 to 60 mm. The center of the screw sleeve 33 is aligned with the wind plate 31 and the flange 35. The rear end is fully welded and fixed at the junction with the flange 35.

[0019] The sealing gasket 4 is a circular rubber asbestos gasket, the inner diameter of which is the same as the outer diameter of the screw sleeve 33, and the outer diameter of which is the same as the outer circle of the flange 35. The sealing gasket 4 is sandwiched between the outer plate of the air duct and the flange 35, and plays a role of being airtight after being clamped. The flange 35 is a circular steel plate with a thickness of 12 to 16 mm and a diameter of D+100 mm. A circular hole is opened in the center to allow the telescopic rod 32 to pass through and freely extend and retract without hindrance. A plurality of through holes for fixing screws 36 are opened near the outer circle and are evenly distributed on the ring. A circular through hole with a diameter of D+40 mm is opened at the contact point between the outer plate of the air duct and the flange 35, and a through hole is also opened at the corresponding position of the fixing screw 36.

[0020] Each air register 3 has a plurality of sets of fixing screws 36, each set of fixing screws 36 is composed of bolts, nuts and washers, and the plurality of sets of fixing screws 36 clamp the flange 35, the sealing gasket 4 and the outer side plate 6.1 of the air duct 6 together, and support the weight of the entire air register 3 and ensure that it is airtight.

[0021] The shaking handle 31 is located outside the air duct 6. The shaking handle 34 consists of a rotating plate 341 and a handle rod 342. The rotating plate 341 is made of a steel plate with a thickness of 12 to 16 mm, with a circle on the top and a rectangle on the bottom. The center of the upper circle is aligned with the center of the telescopic rod 32, and is welded and fixed at the connection with the rear end of the telescopic rod 32. The handle rod 342 is a φ12 mm round steel, which is welded and fixed to the tail end of the rotating plate 341.

[0022] When using the air regulator 3, by holding the handle rod 342 and rotating it clockwise or counterclockwise, the telescopic rod 32 can be moved forward or backward to adjust the distance between the wind plate 31 and the port (i.e., the air inlet) of the air collecting pipe 2, thereby playing a role in adjusting the air volume and wind force.

[0023] like Figure 5 As shown, a conical valve body 37 is additionally provided on the wind plate 31 of the air regulator 3. The maximum outer diameter of the conical valve body 37 is equal to the inner diameter of the air collecting pipe 2. The conical valve body is conducive to guiding the wind into the air collecting pipe. When the conical valve body 37 extends toward the air collecting pipe 2, as the diameter of the conical surface of the valve body continues to increase, the input air volume of the air collecting pipe decreases linearly, and the air volume blown out of the nozzle also gradually decreases until the air is shut off, and the situation of sudden air shutoff will not occur, thereby achieving the purpose of adjusting the air supply volume of the grate.

[0024] The present invention is described above in conjunction with the best embodiments, but the present invention is not limited to the embodiments disclosed above, but should cover various modifications and equivalent combinations based on the essence of the present invention.

Claims

1. A biomass boiler grate bottom air blowing device, comprising an air collecting pipe and a blowing nozzle, wherein the air collecting pipe is arranged on the inner side plate of the air duct, and is characterized in that: A rocker air regulator is arranged at the center line of the air collecting pipe. The rocker air regulator is composed of at least a telescopic rod, a screw sleeve and an air plate. One end of the telescopic rod is threadedly connected to the screw sleeve installed on the outer plate of the air duct, and the other end of the telescopic rod is installed with the air plate. The air plate located in the air duct is aligned with the air outlet of the air collecting pipe.

2. The biomass boiler grate bottom air injection device according to claim 1 is characterized in that: The threaded sleeve is fixedly mounted on a flange, and the flange is mounted on an outer side plate of the air duct.

3. The biomass boiler grate bottom air injection device according to claim 1 is characterized in that: A shaking handle is fixedly mounted on the threaded end of the telescopic rod, and the shaking handle is located outside the outer side plate of the air duct.

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