CN211176769U

CN211176769U - Biomass low-temperature suspension combustion furnace

Info

Publication number: CN211176769U
Application number: CN201922150677.4U
Authority: CN
Inventors: 赵士坤; 王梦伟
Original assignee: Hebei Lanfeng Boiler And Pressure Vessel Manufacturing Co ltd
Current assignee: Hebei Lanfeng Boiler And Pressure Vessel Manufacturing Co ltd
Priority date: 2019-12-04
Filing date: 2019-12-04
Publication date: 2020-08-04
Anticipated expiration: 2029-12-04

Abstract

The utility model discloses a living beings low temperature suspension fires burning furnace belongs to biomass combustion furnace technical field. The biomass low-temperature suspension combustion furnace comprises a furnace body, wherein a combustion chamber, a settling chamber and an air outlet chamber which are communicated with each other are arranged in the furnace body. An air box is arranged below the combustion chamber, an air equalizing plate is arranged between the air box and the combustion chamber, one side of the air box is connected with a high-pressure fan through an air inlet pipe, the lower part of the combustion chamber is connected with a storage bin through a discharging pipe, the air inlet pipe is communicated with the top end of the discharging pipe through a secondary air pipe, and a valve is arranged on the secondary air pipe. The bottom of the furnace body is provided with an ash collecting bin which is positioned below the air box, and the ash collecting bin is connected with the combustion chamber through an ash falling pipe. The biomass low-temperature suspension combustion furnace adopting the structure can solve the problems of easy coking and caking of ash in the combustion furnace; has the advantages of high combustion efficiency and low discharge of nitrogen oxides.

Description

Biomass low-temperature suspension combustion furnace

Technical Field

The utility model belongs to the technical field of biomass combustion furnace technique and specifically relates to a living beings low temperature suspension fires burning furnace.

Background

Biomass energy has now gained increasing importance in boiler fuels due to the short term and environmental degradation problems caused by excessive use of fossil fuels by human beings in the early days. As a big agricultural country, the crop straw yield is about 7.8 hundred million tons every year, which is estimated to reach 10 hundred million tons in 2025 years, and the development amount can reach more than 7 hundred million tons. The waste of resources and serious environmental pollution are caused because the residual crop straws which cannot be treated are directly burnt in the field for more than 3 hundred million tons every year.

The existing biomass fuel boiler, especially agricultural wastes, contains higher chlorine content and alkali metal content than petrochemical fuels, so that the combustion temperature is too high and is difficult to control in the combustion process, and due to the inevitable ash content of the biomass, when the temperature exceeds the ash melting point, coking and caking in the boiler are easily caused, so that a burner cannot be normally used, and the waste of financial resources and material resources and the over-standard discharge are caused.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a living beings low temperature suspension fires burning furnace solves the easy coking of ash in the burning furnace, the problem of caking.

In order to realize the aim, the utility model provides a biomass low-temperature suspension combustion furnace, which comprises a furnace body, wherein two partition walls are arranged inside the furnace body, the partition walls divide the inside of the furnace body into a combustion chamber, a settling chamber and an air outlet chamber, a first ventilation opening for communicating the settling chamber with the combustion chamber is arranged at the top of the partition wall between the settling chamber and the combustion chamber, a second ventilation opening for communicating the settling chamber with the air outlet chamber is arranged at the bottom of the partition wall between the settling chamber and the air outlet chamber, and a hot air outlet is arranged above the air outlet chamber;

an air box is arranged below the combustion chamber, an air equalizing plate is arranged between the air box and the combustion chamber, one side of the air box is connected with a high-pressure fan through an air inlet pipe, the lower part of the combustion chamber is connected with a storage bin through a discharging pipe, the air inlet pipe is communicated with the top end of the discharging pipe through a secondary air pipe, and a valve is arranged on the secondary air pipe;

the bottom of the furnace body is provided with an ash collecting bin which is positioned below the air box, and the ash collecting bin is connected with the combustion chamber through an ash falling pipe.

Preferably, the feed bin is fixed on the mounting bracket, and the bottom of feed bin is provided with the auger, and the feed bin passes through the auger and is connected with the unloading pipe.

Preferably, a layer of clay refractory bricks is arranged inside the furnace body, a rock wool board is arranged outside the furnace body, and a layer of refractory fiber felt is arranged between the rock wool board and the clay refractory bricks.

Preferably, a first check door is arranged on the side wall of the combustion chamber, a second check door is arranged at the second ventilation opening, and a temperature sensor and a pressure sensor are arranged in the combustion chamber.

Preferably, the wind equalizing plate comprises a mounting plate and a wind cap, the wind cap is uniformly arranged on the mounting plate and communicated with a wind box below the wind equalizing plate, and 7-8 wind outlets are uniformly arranged on the side wall of the upper part of the wind cap.

Preferably, the mounting plate is made of refractory concrete and is fixedly connected with the side wall of the combustion chamber.

Preferably, the air speed at the air outlet end of the air inlet pipe is 15-60 m/s, and the air speed in the combustion chamber is 0.3-1.6 m/s.

A living beings low temperature suspension fires burning furnace, the wind speed of air-out end of air-supply line reaches 15-60 meters per second, can hold up the biomass fuel in the stove, the motion of rolling from top to bottom in certain altitude range, the burning is more abundant. The secondary air in the secondary air pipe enables the combustion chamber to generate oxygen-enriched combustion, and then the height of the hearth is increased by controlling the feeding amount, so that the temperature in the hearth is reduced, the fuel in the combustion chamber is subjected to low-temperature suspension combustion, and the purpose of full combustion and no coking is achieved.

The technical solution of the present invention is further described in detail by the accompanying drawings and examples.

Drawings

FIG. 1 is a schematic structural diagram of an embodiment of a biomass low-temperature suspension combustion furnace of the present invention;

FIG. 2 is a schematic longitudinal sectional view of an embodiment of a biomass low-temperature suspension combustion furnace according to the present invention;

FIG. 3 is a schematic cross-sectional view of an embodiment of a biomass low-temperature suspension combustion furnace according to the present invention;

fig. 4 is a schematic structural view of an air equalizing plate of an embodiment of the biomass low-temperature suspension combustion furnace of the present invention.

Reference numerals

1. A furnace body; 2. a combustion chamber; 3. a settling chamber; 4. an air outlet chamber; 5. a storage bin; 6. a packing auger; 7. a discharging pipe; 8. a high pressure fan; 9. an air inlet pipe; 10. an air box; 11. a secondary air duct; 12. a dust falling pipe; 13. an ash collecting bin; 14. a mounting frame; 15. a first inspection door; 16. a second inspection door; 17. a temperature sensor; 18. a pressure sensor; 19. reinforcing the beam; 20. a hot air outlet; 21. a first ventilation opening; 22. a second air vent; 23. rock wool boards; 24. clay refractory bricks; 25. a refractory fiber mat; 26. a wind equalizing plate; 27. mounting a plate; 28. a hood; 29. and (7) air outlet.

Detailed Description

Examples

Fig. 1 is the utility model relates to a structure schematic diagram of burning furnace embodiment is fired in living beings low temperature suspension, fig. 2 is the utility model relates to a living beings low temperature suspension fires the longitudinal section structure schematic diagram of burning furnace embodiment, fig. 3 is the utility model relates to a cross section structure schematic diagram of burning furnace embodiment is fired in living beings low temperature suspension, fig. 4 is the utility model relates to a living beings low temperature suspension fires equal aerofoil structure schematic diagram of burning furnace embodiment. As shown in the figure, the biomass low-temperature suspension combustion furnace comprises a furnace body 1, wherein two partition walls are arranged inside the furnace body 1, and the partition walls are built by clay refractory bricks 24. The interior of the furnace body 1 is divided into a combustion chamber 2, a settling chamber 3 and an air outlet chamber 4 by a partition wall. The top of the partition wall between the settling chamber 3 and the combustion chamber 2 is provided with a first ventilation opening 21 for communicating the settling chamber 3 and the combustion chamber 2, and the bottom of the partition wall between the settling chamber 3 and the air outlet chamber 4 is provided with a second ventilation opening 22 for communicating the settling chamber 3 and the air outlet chamber 4. The combustion chamber 2 is used for combusting biomass materials, high-temperature smoke in the combustion chamber 2 enters the settling chamber 3 through the first ventilation opening 21, and on one hand, the settling chamber 3 enables smoke dust mixed in the high-temperature smoke to settle at the high-temperature smoke dust; on the other hand, the flames in the combustion chamber 2 are effectively isolated, and the flames in the combustion chamber 2 are prevented from running out of the furnace body 1 from the hot air outlet 20. A hot air outlet 20 is arranged above the air outlet chamber 4.

An air box 10 is arranged below the combustion chamber 2, and an air equalizing plate 26 is arranged between the air box 10 and the combustion chamber 2. One side of the air box 10 is connected with a high pressure fan 8 through an air inlet pipe 9, the high pressure fan 8 sends high pressure air into the air box 10 from the air inlet pipe 9, and the bottom surface of the air box 10 is an inclined surface which inclines upwards, so that the high pressure air is favorably sent into the combustion chamber 2 through an air equalizing plate 26. The lower part of the combustion chamber 2 is connected with a bin 5 through a blanking pipe 7, the bin 5 is fixed on a mounting frame 14, and the mounting frame 14 is fixed on the ground. The auger 6 is arranged at the bottom of the bin 5, the bin 5 is connected with the blanking pipe 7 through the auger 6, the auger 6 sends the biomass fuel in the bin 5 into the blanking pipe 7 which is inclined downwards, and the biomass fuel is sent into the combustion chamber 2 through the blanking pipe 7 to be combusted.

The air inlet pipe 9 is communicated with the top end of the blanking pipe 7 through a secondary air pipe 11, and a valve is arranged on the secondary air pipe 11. High-pressure air generated by the high-pressure fan 8 is sent into the discharging pipe 7 through the secondary air pipe 11, on one hand, the secondary air can enable the combustion furnace to generate oxygen-enriched combustion, the temperature of the hearth is reduced to be lower than the ash melting point, and the ash is prevented from coking and caking in the furnace body 1.

The bottom of the furnace body 1 is provided with an ash collecting bin 13, the ash collecting bin 13 is positioned below the air box 10, the ash collecting bin 13 is connected with the combustion chamber 2 through an ash dropping pipe 12, and the ash dropping pipe 12 is fixed on an air equalizing plate 26. The ash generated by combustion in the combustion chamber 2 falls into an ash collecting bin 13 through an ash falling pipe 12 for collection and then is periodically cleaned. A first check door 15 is arranged on the side wall of the combustion chamber 2, a second check door 16 is arranged at the position of a second vent 22, and a temperature sensor 17 and a pressure sensor 18 are arranged in the combustion chamber 2.

A layer of clay refractory bricks 24 is arranged inside the furnace body 1, a rock wool board 23 is arranged outside the furnace body 1, and a layer of refractory fiber felt 25 is arranged between the rock wool board 23 and the clay refractory bricks 24. The refractory fiber felt 25 and the rock wool board 23 have good heat preservation effect. The reinforcing beam 19 is arranged outside the furnace body 1, so that the strength of the furnace body 1 is improved.

The wind equalizing plate 26 comprises a mounting plate 27 and a wind cap 28, the wind cap 28 is uniformly arranged on the mounting plate 27 and is communicated with the wind box 10 below the wind equalizing plate 26, 7-8 wind outlets 29 are uniformly arranged on the side wall of the upper part of the wind cap 28, and high-pressure wind in the wind box 10 enters the combustion chamber 2 through the wind outlets 29 on the wind cap 28 to provide oxygen for combustion. The mounting plate 27 is built of refractory concrete, and the mounting plate 27 is fixedly connected with the side wall of the combustion chamber 2.

Under the action of the high-pressure fan 8, the air speed at the air outlet end of the air inlet pipe 9 reaches 15-60 m/s, the air speed in the combustion chamber 2 reaches 0.3-1.6 m/s, and biomass fuels with various weights can be used. The solid biomass fuel in the combustion chamber 2 is supported by the upward flowing air flow in the furnace and rolls up and down in a certain height range, so that the biomass fuel is suspended and combusted.

The height of the combustion chamber 2 is 4000mm, the height of the combustion chamber 2 is increased, so that fuel has sufficient combustion space, secondary air is matched, the temperature of a hearth of the combustion chamber 2 can be reduced, the fuel is subjected to low-temperature suspension combustion in the hearth, the purpose of sufficient combustion but no coking is achieved, the efficiency of the combustion furnace is greatly improved, the fuel is saved, the cost is reduced, and the emission of nitrogen oxides is obviously reduced.

The fuel consumption of the biomass low-temperature suspension combustion furnace is 1185KG/h, and the combustion efficiency is 94%.

Therefore, the biomass low-temperature suspension combustion furnace adopting the structure can solve the problems of easy coking and caking of ash in the combustion furnace; has the advantages of high combustion efficiency and low discharge of nitrogen oxides.

The above are specific embodiments of the present invention, but the scope of protection of the present invention should not be limited thereto. Any changes or substitutions which can be easily conceived by those skilled in the art within the technical scope of the present invention are covered by the protection scope of the present invention, and therefore, the protection scope of the present invention is subject to the protection scope defined by the claims.

Claims

1. A biomass low-temperature suspension combustion furnace is characterized in that: the furnace comprises a furnace body, wherein two partition walls are arranged inside the furnace body, the partition walls divide the inside of the furnace body into a combustion chamber, a settling chamber and an air outlet chamber, a first ventilation opening communicated with the settling chamber and the combustion chamber is formed in the top of the partition wall between the settling chamber and the combustion chamber, a second ventilation opening communicated with the settling chamber and the air outlet chamber is formed in the bottom of the partition wall between the settling chamber and the air outlet chamber, and a hot air outlet is formed above the air outlet chamber;

2. The biomass low-temperature suspension combustion furnace as claimed in claim 1, wherein: the feed bin is fixed on the mounting bracket, and the bottom of feed bin is provided with the auger, and the feed bin passes through the auger and is connected with the unloading pipe.

3. The biomass low-temperature suspension combustion furnace as claimed in claim 1, wherein: a layer of clay refractory bricks is arranged inside the furnace body, a rock wool board is arranged outside the furnace body, and a layer of refractory fiber felt is arranged between the rock wool board and the clay refractory bricks.

4. The biomass low-temperature suspension combustion furnace as claimed in claim 1, wherein: a first inspection door is arranged on the side wall of the combustion chamber, a second inspection door is arranged at the second ventilation opening, and a temperature sensor and a pressure sensor are arranged in the combustion chamber.

5. The biomass low-temperature suspension combustion furnace as claimed in claim 1, wherein: the wind-equalizing plate comprises a mounting plate and a wind cap, the wind cap is uniformly arranged on the mounting plate and communicated with a wind box below the wind-equalizing plate, and 7-8 wind outlets are uniformly arranged on the side wall of the upper part of the wind cap.

6. The biomass low-temperature suspension combustion furnace as claimed in claim 5, wherein: the mounting panel is fire-resistant concrete material, mounting panel and the lateral wall fixed connection of combustion chamber.

7. The biomass low-temperature suspension combustion furnace as claimed in claim 1, wherein: the air speed at the air outlet end of the air inlet pipe is 15-60 m/s, and the air speed in the combustion chamber is 0.3-1.6 m/s.