CN211060090U - Boiler capable of burning biomass fuel based on transformation of existing chamber-fired boiler - Google Patents
Boiler capable of burning biomass fuel based on transformation of existing chamber-fired boiler Download PDFInfo
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- CN211060090U CN211060090U CN201921793241.0U CN201921793241U CN211060090U CN 211060090 U CN211060090 U CN 211060090U CN 201921793241 U CN201921793241 U CN 201921793241U CN 211060090 U CN211060090 U CN 211060090U
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Abstract
The utility model discloses a combustible biomass fuel's boiler based on present room combustion boiler reforms transform, including boiler furnace, be equipped with the inside and outside venturi burner nozzle who link up the furnace wall on the furnace wall, the furnace bottom is equipped with the ash falling pipe with furnace intercommunication, and the exit that venturi burner nozzle is located furnace is equipped with the ignition nozzle, and the ignition nozzle passes through the pipeline intercommunication with the ignition gas source that sets up outside furnace, is equipped with the electrode of striking sparks on the ignition nozzle, venturi burner nozzle includes shrink section, direct current section, diffusion zone and the current-limiting section of connection in proper order. The boiler is transformed by utilizing the existing chamber combustion boiler, the cost is saved, and the heating surfaces of the original boiler body and the tail part of the boiler are not changed, so that the safety of the transformed boiler is not influenced, the Venturi combustion nozzle is arranged at the positions of the original pulverized coal nozzle and the secondary air inlet, the space of a hearth can be fully utilized, and the radiation heat exchange area is increased.
Description
Technical Field
The utility model relates to a room fires the transformation technique of boiler, specifically is a boiler of combustible biomass fuel based on current room fires boiler transformation.
Background
With the increasing national environmental protection requirements and the increasing exhaustion of fossil energy, the efficient utilization of biomass fuel is more and more paid attention by people. However, there are a large number of coal-fired industrial boilers and heating boilers in China, as shown in fig. 4 and 5.
The biomass fuel is used as a renewable green fuel, has wide material sources and low price, and successively invents a biomass fuel forming particle combustion technology and a biomass fuel dust cloud combustion technology besides original and low-efficiency direct combustion.
The biomass fuel forming granule combustion technology is a method of drying and roughly grinding biomass fuel in a special independent factory, then pressing and forming the biomass fuel into granules, and then carrying out stratified combustion, which not only increases the fuel cost, but also does not overcome the low efficiency of the stratified combustion.
The biomass fuel dust cloud combustion technology is characterized in that biomass fuel bulk is crushed, dried and then ground into superfine powder, the fineness of the superfine powder needs to reach micron level, and then the superfine powder is combusted in a special heat-insulating combustion chamber to reach a high temperature of more than 1400 ℃, so that the chemical incomplete combustion loss q3 and the mechanical incomplete combustion loss q4 are reduced to zero, the fuel use efficiency is greatly improved, but the technology still has five defects:
firstly, a large amount of electric energy is consumed for preparing micron-sized ultrafine powder in an independent factory, and a large amount of heat energy is consumed for drying coarse and wet fuels, so that the fuel cost is increased;
secondly, the biomass fuel micron-sized superfine powder can generate high-concentration nitric oxide when being burnt at ultrahigh temperature in an insulated combustion chamber, and a large amount of denitration substances are consumed to reach the national specified nitric oxide emission standard, so that the running economy is reduced, and the serious high-temperature corrosion is generated on steel components of a boiler;
thirdly, the flame of the combustion mode only exists in the heat-insulating combustion chamber, and only high-temperature hot air which does not basically emit visible light is sprayed into the hearth of the boiler, so that the radiation heat exchange capability is reduced, and the flame can only be used on a special boiler but not on the existing boiler;
fourthly, the interface for feeding the biomass fuel powder into the combustor is arranged on an air outlet pipe of the air blower, and air and materials are mixed unevenly and are easy to break fire;
fifthly, when the existing biomass fuel is used in a boiler, only the problem of combustion is concerned, but the utilization of waste heat of exhaust gas is generally ignored, so that the exhaust gas temperature of the boiler is still higher, and a certain distance is reserved from the requirement of reaching the emission level of the boiler.
How to reform the existing coal-fired chamber industrial boiler and heating boiler into a boiler capable of burning biomass fuel is a problem which needs to be solved urgently at present.
SUMMERY OF THE UTILITY MODEL
The utility model provides a solve exist among the prior art not enough, provide a boiler of combustible biomass fuel based on current room burning boiler is reformed transform. The boiler saves the cost, does not change the heating surface of the original boiler body and the tail part of the boiler, does not influence the safety of the reformed boiler, and can fully utilize the space of a hearth and increase the radiation heat exchange area by arranging the Venturi combustion nozzle at the positions of the original pulverized coal nozzle and the primary and secondary air inlet.
Realize the utility model discloses the technical scheme of purpose is:
a boiler capable of burning biomass fuel based on the transformation of the existing chamber combustion boiler comprises a boiler furnace, wherein a Venturi combustion nozzle penetrating through the inner side and the outer side of the furnace wall is arranged on the furnace wall, an ash falling pipe communicated with the furnace is arranged at the bottom of the furnace, an ignition nozzle is arranged at an outlet of the Venturi combustion nozzle in the furnace and communicated with an ignition gas source arranged outside the furnace through a pipeline, an ignition electrode is arranged on the ignition nozzle,
the venturi combustion nozzle comprises a contraction section, a direct-current section, a diffusion section and a flow limiting section which are sequentially connected, wherein the contraction section and the diffusion section are hollow conical tubes, and the direct-current section and the flow limiting section are hollow cylindrical tubes.
The length of the straight flow section of the Venturi combustion nozzle is larger than or equal to the inner diameter of the straight flow section, in the combustion process, the flow speed of the air-material mixture in the straight flow section is larger than the flame propagation speed of the air-material mixture, and the flow speed of the air-material mixture at the outlet of the diffusion section is matched with the speed required by stable combustion of the air-material mixture.
The length of the straight section of the Venturi combustion nozzle is 2 times of the inner diameter of the Venturi combustion nozzle, so that backfire is prevented.
The length of the diffusion section of the Venturi combustion nozzle is 3-15 times of the inner diameter of the outlet of the Venturi combustion nozzle, so that the air-material mixture can be diffused more uniformly, and the air-material mixture can be combusted more fully.
The venturi combustion nozzle is made of heat-resistant steel.
The ignition gas source is canned natural gas.
The biomass fuel boiler is characterized in that biomass fuel powder with the fineness below 2mm is used in the boiler, the biomass fuel powder and air are conveyed to a pipeline by an air blower to form a wind-material mixture, the wind-material mixture is input from an inlet of a contraction section of a Venturi combustion nozzle, is ignited at an outlet of a flow limiting section of the Venturi combustion nozzle and is sprayed into a hearth for combustion, the biomass fuel wind-material mixture is ignited to be ignited by inputting gas, an ignition electrode ignites inflammable gas in the ignition nozzle, and the gas input can be cut off after the combustible gas ignition wind-material mixture is stably combusted.
The boiler that this technical scheme reformed transform on the basis of current coal-fired room burning boiler, installs venturi combustion nozzle in the position of former buggy spout and a overgrate air import, and the furnace wall hole and the combustor space after unnecessary buggy spout is demolishd are sealed with refractory material, change into the ash falling pipe at original slagging-off mechanism, and the ignition nozzle after the transformation and strike sparks the electrode and all can insert original safety control system and carry out automatic control.
The boiler saves the cost, does not change the heating surface of the original boiler body and the tail part of the boiler, does not influence the safety of the reformed boiler, and can fully utilize the space of a hearth and increase the radiation heat exchange area by arranging the Venturi combustion nozzle at the positions of the original pulverized coal nozzle and the primary and secondary air inlet.
Drawings
FIG. 1 is a schematic structural diagram of a boiler based on modification of a pulverized coal-fired boiler in an embodiment;
FIG. 2 is a schematic structural diagram of a boiler based on the modification of a circulating fluidized bed boiler in the embodiment;
FIG. 3 is a schematic structural diagram of a Venturi combustion nozzle in the embodiment;
FIG. 4 is a schematic structural diagram of a conventional pulverized coal-fired boiler;
fig. 5 is a schematic structural view of a conventional circulating fluidized bed boiler.
In the figure, 1, a hearth 2, a Venturi combustion nozzle 21, a contraction section 22, a direct-current section 23, a diffusion section 24, a flow limiting section 3, an ash falling pipe 4, an ignition nozzle 5 and an ignition air source are arranged.
Detailed Description
The contents of the present invention will be further described with reference to the accompanying drawings and examples, but the present invention is not limited thereto.
Example 1:
the present example is further illustrated by taking the modification of a coal-fired powder boiler as an example.
Referring to fig. 1, a boiler capable of burning biomass fuel based on the transformation of the existing chamber combustion boiler comprises a boiler hearth 1, a venturi combustion nozzle 2 penetrating the inside and outside of the wall of the hearth 1 is arranged on the wall of the hearth 1, an ash falling pipe 3 communicated with the hearth 2 is arranged at the bottom of the hearth 2, an ignition nozzle 4 is arranged at an outlet of the venturi combustion nozzle 2 in the hearth 2, the ignition nozzle 4 is communicated with an ignition air source 5 arranged outside the hearth 1 through a pipeline, a sparking electrode is arranged on the ignition nozzle 4,
as shown in fig. 3, the venturi combustion nozzle 2 includes a convergent section 21, a straight flow section 22, a divergent section 23 and a flow restriction section 24 connected in sequence, the convergent section 21 and the divergent section 23 are hollow tapered tubes, and the straight flow section 22 and the flow restriction section 24 are hollow cylindrical tubes.
The length of the straight section 22 of the venturi combustion nozzle 2 is greater than or equal to the inner diameter of the straight section 22, and during the combustion process, the flow velocity of the air-material mixture in the straight-flow section 22 is greater than the flame propagation velocity of combustion of the air-material mixture, if the flame propagation velocity of the millimeter-scale biomass fuel is in the range of 15-25m/s, the flow velocity of the air-material mixture in the straight-flow section 22 in this embodiment is 30m/s, so as to ensure that the combustion flame at the outlet of the Venturi combustion nozzle 2 cannot cross the direct-current section and be tempered to the inlet, thereby achieving the effects of preventing tempering and improving safety, the flow speed of the air-material mixture at the outlet of the diffusion section 23 is matched with the speed required by the stable combustion of the air-material mixture, therefore, the flow speed of the air-material mixture at the outlet of the diffusion section 23 in this embodiment is 15m/s, so as to ensure that the air-material mixture is not scattered to the inner container of the boiler to burn and cause coking after being diffused by the diffusion section 23 and sprayed out by the flow-limiting section 24.
The straight section 22 of the venturi combustion nozzle 2 has a length 2 times its inner diameter to prevent backfiring.
The length of the diffusion section 23 of the venturi combustion nozzle 2 is 10 times of the inner diameter of the outlet of the venturi combustion nozzle, so that the diffusion of the air-fuel mixture is more uniform, and the combustion of the air-fuel mixture is more sufficient.
The venturi combustion nozzle 2 is made of 310S stainless steel to ensure continuous use in a high temperature environment.
The ignition gas source 5 is canned natural gas.
The boiler uses biomass fuel powder with the fineness below 2mm, the biomass fuel powder and air are conveyed to a pipeline by an air blower to form a wind-material mixture, the wind-material mixture is input from the inlet of the contraction section 21 of the Venturi combustion nozzle 2, is ignited at the outlet of the flow limiting section 24 of the Venturi combustion nozzle 2 and is sprayed into the hearth 1 for combustion, the biomass fuel wind-material mixture is ignited to be ignited by inputting gas, the ignition electrode ignites the inflammable gas in the ignition nozzle 4, the gas input can be cut off after the combustion of the combusted gas ignition wind-material mixture is stabilized, then the biomass fuel wind-material mixture in the hearth 1 is fully combusted, as the biomass fuel wind-material mixture is fully combusted in the hearth 1, the thermal efficiency of the boiler is improved to 90 percent from the original 65 percent, the direct economic benefit is improved by more than 25 percent, the discharge of harmful substances is reduced by 60 percent compared with the biomass fuel wind-material mixture generated during the combustion of the, the concentration of smoke discharging dust is reduced from the original 80mg/m through thin film tube fruit cultivation to 30 mg/m through thin film fruit cultivation.
The modified boiler of this example is based on the existing coal-fired boiler in the coal-fired chamber, install Venturi combustion nozzle 2 in the position of original pulverized coal spout and a overgrate air import, the furnace wall hole and burner gap after the unnecessary pulverized coal spout is demolished are sealed with refractory material, change into ash falling pipe 3 in original deslagging organization, the ignition nozzle 4 after the modification and strike sparks the electrode and can insert original safety control system and carry on automatic control.
Example 2:
this example is further illustrated by way of example of a modification of a circulating fluidized bed boiler.
As shown in fig. 2, the modified parts of the circulating fluidized bed boiler are the same as those of the coal-fired powder boiler, and the parts of the remaining circulating fluidized bed boiler remain.
Claims (6)
1. A boiler capable of burning biomass fuel based on the transformation of the existing chamber combustion boiler comprises a boiler furnace and is characterized in that a Venturi combustion nozzle penetrating through the inside and the outside of the furnace wall is arranged on the furnace wall, an ash falling pipe communicated with the furnace is arranged at the bottom of the furnace, an ignition nozzle is arranged at an outlet of the Venturi combustion nozzle in the furnace and communicated with an ignition gas source arranged outside the furnace through a pipeline, a sparking electrode is arranged on the ignition nozzle,
the venturi combustion nozzle comprises a contraction section, a direct-current section, a diffusion section and a flow limiting section which are sequentially connected, wherein the contraction section and the diffusion section are hollow conical tubes, and the direct-current section and the flow limiting section are hollow cylindrical tubes.
2. The boiler capable of combusting the biomass fuel, which is modified based on the existing chamber-fired boiler, according to claim 1, wherein the length of the straight section of the venturi combustion nozzle is greater than or equal to the inner diameter of the straight section, the flow velocity of the air-fuel mixture in the straight section is greater than the flame propagation velocity of the combustion of the air-fuel mixture during the combustion process, and the flow velocity of the air-fuel mixture at the outlet of the diffuser section is matched with the required velocity for the stable combustion of the air-fuel mixture.
3. The retrofitted combustible biomass fuel boiler based on an existing chamber-fired boiler of claim 1, wherein the straight section of said venturi combustion nozzle has a length 2 times its inner diameter.
4. The retrofitted combustible biomass fuel boiler based on an existing chamber-fired boiler of claim 1, wherein the length of said venturi combustion nozzle's diffuser section is 3-15 times its inner diameter at the outlet.
5. The retrofitted combustible biomass fuel boiler based on an existing chamber-fired boiler of claim 1, wherein said venturi-fired nozzle is made of heat resistant steel.
6. The retrofitted combustible biomass fuel boiler based on an existing chamber-fired boiler according to claim 1, wherein said ignition gas source is canned natural gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921793241.0U CN211060090U (en) | 2019-10-24 | 2019-10-24 | Boiler capable of burning biomass fuel based on transformation of existing chamber-fired boiler |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921793241.0U CN211060090U (en) | 2019-10-24 | 2019-10-24 | Boiler capable of burning biomass fuel based on transformation of existing chamber-fired boiler |
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| Publication Number | Publication Date |
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| CN211060090U true CN211060090U (en) | 2020-07-21 |
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| CN201921793241.0U Active CN211060090U (en) | 2019-10-24 | 2019-10-24 | Boiler capable of burning biomass fuel based on transformation of existing chamber-fired boiler |
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| CN (1) | CN211060090U (en) |
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2019
- 2019-10-24 CN CN201921793241.0U patent/CN211060090U/en active Active
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