CN110608433A - Venturi combustion nozzle for combusting biomass powder fuel - Google Patents
Venturi combustion nozzle for combusting biomass powder fuel Download PDFInfo
- Publication number
- CN110608433A CN110608433A CN201911015285.5A CN201911015285A CN110608433A CN 110608433 A CN110608433 A CN 110608433A CN 201911015285 A CN201911015285 A CN 201911015285A CN 110608433 A CN110608433 A CN 110608433A
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- Prior art keywords
- section
- flow
- air
- material mixture
- combustion
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- 238000002485 combustion reaction Methods 0.000 title claims abstract description 52
- 239000000446 fuel Substances 0.000 title claims abstract description 33
- 239000002028 Biomass Substances 0.000 title claims abstract description 19
- 239000000843 powder Substances 0.000 title claims abstract description 17
- 239000000203 mixture Substances 0.000 claims abstract description 31
- 230000008602 contraction Effects 0.000 claims abstract description 18
- 239000000463 material Substances 0.000 claims abstract description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 2
- 230000006978 adaptation Effects 0.000 claims description 2
- 239000010959 steel Substances 0.000 claims description 2
- 238000009792 diffusion process Methods 0.000 abstract description 14
- 238000010304 firing Methods 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 238000005496 tempering Methods 0.000 description 2
- 241000609240 Ambelania acida Species 0.000 description 1
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 239000010905 bagasse Substances 0.000 description 1
- 238000004939 coking Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- -1 sawdust Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000010902 straw Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D1/00—Burners for combustion of pulverulent fuel
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
Abstract
The invention belongs to the field of biomass combustion equipment, and particularly relates to a Venturi combustion nozzle for combusting biomass powder fuel, which comprises a contraction section, a direct-flow section, a diffusion section and a flow limiting section which are sequentially connected along the air-material conveying direction, wherein the contraction section and the diffusion section are hollow conical tubes, the direct-flow section and the flow limiting section are hollow cylindrical tubes, the length of the direct-flow section is not smaller than the inner diameter of the direct-flow section, the flow speed of air-material mixture in the direct-flow section is larger than the flame propagation speed of combustion of the air-material mixture in the combustion process, 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 conveying speed of the air-material mixture in the nozzle can be improved to exceed the flame propagation speed by using the contraction section of the Venturi combustion nozzle, and the high-speed W2 is kept in the direct-flow section, so that the flame of the fuel cannot reversely propagate to an inlet through, thereby achieving the purpose of preventing backfire.
Description
Technical Field
The invention belongs to the field of biomass combustion equipment, and particularly relates to a Venturi combustion nozzle for combusting biomass powder fuel.
Background
The biomass powder fuel is a novel clean fuel which is formed (such as granular powder) by crushing, mixing, extruding, drying and the like agricultural and forestry wastes (such as straws, sawdust, bagasse, rice chaff and the like) and can be directly combusted. The biomass fuel can be combusted in a grate firing mode and a chamber firing mode, and the grate firing mode is increasingly popularized in the chamber firing mode due to low combustion efficiency. During chamber combustion, biomass powder and air are sucked into a pipeline by an air blower to form an air-material mixture, the air-material mixture is sprayed into a combustor through a straight-barrel nozzle to be ignited, the biomass powder can be manufactured with high energy consumption only by using micron-sized ultrafine powder in the conventional chamber combustion mode, a special combustion chamber is required to be prepared for combustion, and only high-temperature hot air which does not basically emit visible light is sprayed into a boiler furnace, so that the radiation heat exchange capability is reduced, the radiation heat exchange capability is not high, tempering is easy to occur by using the straight-barrel nozzle, and the safety and reliability are not high.
Disclosure of Invention
The invention aims to provide a Venturi combustion nozzle for combusting biomass powder fuel, which overcomes the defects of the prior art.
The technical scheme for realizing the aim of the invention is as follows,
the utility model provides a burning biomass powder fuel's venturi combustion nozzle, venturi combustion nozzle includes contraction section, direct current section, diffuser, the current-limiting section that connects in order along wind material direction of delivery, contraction section, diffuser are the cavity taper pipe, direct current section, current-limiting section are cavity column pipe, the length of direct current section is not less than the internal diameter of direct current section, and in the combustion process, the velocity of flow of the wind material mixture in the direct current section is greater than the flame propagation speed that the wind material mixture burns, and the velocity of flow and the wind material mixture of the diffuser export stabilize the required speed looks adaptation of burning.
Further, the length of the direct current section is 2 times of the inner diameter of the direct current section.
Further, the length of the diffusion section is 3-15 times of the inner diameter of the outlet of the diffusion section.
Further, the venturi combustion nozzle is made of heat-resistant steel.
During chamber combustion, the Venturi combustion nozzle is adopted to replace the existing straight-tube nozzle, the speed of an air-fuel mixture at the inlet of a contraction section is set to be W1, the speed of the outlet of the contraction section, namely the inlet of a straight-flow section, is set to be W2, the speed of the outlet of a diffusion section, namely the inlet of a flow limiting section is set to be W3, the air-fuel mixture of biomass fuel powder and air is accelerated in the contraction section, the W1 is the flow speed of the air-fuel mixture in an air-fuel conveying pipeline, mainly depends on the power of a blower and other related economic considerations, the W1 is also called the economic flow speed of fluid conveying, the thermal engineering handbooks are provided with empirical range values, the normal flow speed W1 of a dynamic air-fuel mixture is generally set to be 5-15m/s, and the relation exists between the inner diameter D of the air-fuel mixture
The formula I is as follows:
wherein D is the diameter in m; q is the air quantity in unitS; w is the flow velocity, and the unit is m/s;
obtaining the inner diameter of the inlet of the contraction section according to a formula I; the flame propagation speed range of the millimeter-scale biomass fuel is 15-25m/s, the speed W2 of the air-material mixture at the outlet of the contraction section is greater than the maximum flame propagation speed, and the inner diameter of the outlet of the contraction section can be obtained by a formula I; the required velocity of the air-fuel mixture for stable combustion depends on the application of the combustion nozzle, the required velocity of the air-fuel mixture for stable combustion is lower than the maximum velocity of flame propagation, and when the Venturi combustion nozzle is used as a normal nozzle, the outlet flow velocity W3 of the diffusion section is not more than 15 m/s; when used as a firing nozzle, W3 is not more than 10m/s, and the corresponding diffuser exit inner diameter can be designed according to equation one.
Aiming at the defect that the straight-tube nozzle in the prior art is easy to be tempered, the contraction section of the Venturi combustion nozzle can improve the conveying speed of the air-material mixture in the nozzle to exceed the propagation speed of flame, and the high speed W2 is kept in the straight-flow section, so that the flame of the fuel cannot reversely propagate to an inlet through the straight-flow section, and the purpose of preventing tempering is achieved; the air-fuel mixture undergoes the processes of acceleration, uniform speed, deceleration and combustion in the Venturi combustion nozzle, the speed of the air-fuel mixture is reduced to the flow speed W3 required by stable combustion of flame by the aid of the function of the diffusion section, the large-range diffusion of the combustion torch is limited by the function of the flow limiting section, the length of the flow limiting section is based on the condition that fuel particles are completely combusted before contacting with a water cooling wall of a boiler, so that the fuel is prevented from being scattered on the water cooling wall of the boiler to combust to cause coking, and by means of the Venturi combustion nozzle, an existing special combustion chamber can be omitted, and the Venturi combustion nozzle can be directly applied to the existing boiler combustion chamber to burn water, so that.
Drawings
FIG. 1 is a schematic structural view of a venturi combustion nozzle in accordance with an embodiment of the present invention.
In the figure, 1. contraction section; 2. a direct current section; 3. a diffuser section; 4. a flow restriction section.
The black arrows indicate the conveying direction of the air-fuel mixture, W1 indicates the flow velocity at the inlet of the contraction section, W2 indicates the flow velocity of the direct flow section, and W3 indicates the flow velocity at the outlet of the diffusion section.
Detailed Description
The present invention will be described in detail with reference to examples.
Referring to fig. 1, a venturi combustion nozzle for combusting biomass powder fuel, the venturi combustion nozzle includes a contraction section 1, a straight flow section 2, a diffusion section 3, and a flow-limiting section 4, which are connected in sequence along a conveying direction of a wind-material mixture, the contraction section 1 and the diffusion section 3 are hollow conical tubes, the straight flow section 2 and the flow-limiting section 4 are hollow cylindrical tubes, a length of the straight flow section 2 is 2 times an inner diameter of the straight flow section, the straight flow section is selected to have a suitable length to ensure that a combustion flame at an outlet of the venturi combustion nozzle cannot pass through the straight flow section and be tempered to an inlet, a length of the diffusion section 3 is 10 times an inner diameter of an outlet thereof, the diffusion section 3 is selected to have a suitable length to facilitate more uniform mixing of the wind-material, a flow velocity W2 of the wind-material mixture in the straight flow section 2 is greater than a propagation velocity of the flame generated by combustion of the wind-material mixture during combustion, in this embodiment, the flow speed W3 of the air-fuel mixture at the outlet of the diffuser section 3 is matched with the speed required by the stable combustion of the air-fuel mixture, in the embodiment, when the Venturi combustion nozzle is used as a normal nozzle, the W3 is 15 m/s; when used as an ignition nozzle, W3 is 10 m/s;
the venturi combustion nozzle is made of 310S stainless steel to ensure continuous use in a high temperature environment of 1100 ℃.
Claims (4)
1. The utility model provides a burning biomass powder fuel's venturi combustion nozzle, characterized in that, venturi combustion nozzle includes contraction section, direct current section, diffuser, the current-limiting section that connects in order along wind material direction of delivery, contraction section, diffuser are the cavity taper pipe, direct current section, current-limiting section are cavity column pipe, the length of direct current section is not less than the internal diameter of direct current section, and in the combustion process, the velocity of flow of the wind material mixture in the direct current section is greater than the flame propagation speed that the wind material mixture burns, and the velocity of flow of the wind material mixture of diffuser export and the required rate looks adaptation of the stable burning of wind material mixture.
2. The venturi combustion nozzle for combusting biomass powder fuel according to claim 1, wherein the length of the straight flow section is 2 times the inner diameter thereof.
3. The venturi combustion nozzle of burning biomass powder fuel according to claim 1, wherein the length of the diffuser section is 3-15 times of the inner diameter of the outlet thereof.
4. The venturi combustion nozzle of burning biomass powder fuel according to claim 1, wherein the venturi combustion nozzle is made of heat-resistant steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911015285.5A CN110608433A (en) | 2019-10-24 | 2019-10-24 | Venturi combustion nozzle for combusting biomass powder fuel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911015285.5A CN110608433A (en) | 2019-10-24 | 2019-10-24 | Venturi combustion nozzle for combusting biomass powder fuel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110608433A true CN110608433A (en) | 2019-12-24 |
Family
ID=68895092
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911015285.5A Pending CN110608433A (en) | 2019-10-24 | 2019-10-24 | Venturi combustion nozzle for combusting biomass powder fuel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110608433A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111911961A (en) * | 2020-09-02 | 2020-11-10 | 西安交通大学 | Natural gas high-proportion hydrogen-blending combustion burner |
| CN112984554A (en) * | 2021-03-03 | 2021-06-18 | 中国人民解放军国防科技大学 | High-speed premixing jet flow flame combustion enhancing device based on gas ejector |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB352516A (en) * | 1930-02-12 | 1931-07-13 | Arthur Docking | Improvements in or relating to powdered fuel burners |
| CN202379938U (en) * | 2011-12-23 | 2012-08-15 | 贵州桑立洁净能源科技开发有限公司 | Coal gas and tar oil recovering system for carbonization furnace |
| CN110345475A (en) * | 2019-07-23 | 2019-10-18 | 华中科技大学 | A kind of premixed anti-backfire Flameless burner |
| CN210717525U (en) * | 2019-10-24 | 2020-06-09 | 广西霄能绿色科技有限公司 | Venturi combustion nozzle for combusting biomass powder fuel |
-
2019
- 2019-10-24 CN CN201911015285.5A patent/CN110608433A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB352516A (en) * | 1930-02-12 | 1931-07-13 | Arthur Docking | Improvements in or relating to powdered fuel burners |
| CN202379938U (en) * | 2011-12-23 | 2012-08-15 | 贵州桑立洁净能源科技开发有限公司 | Coal gas and tar oil recovering system for carbonization furnace |
| CN110345475A (en) * | 2019-07-23 | 2019-10-18 | 华中科技大学 | A kind of premixed anti-backfire Flameless burner |
| CN210717525U (en) * | 2019-10-24 | 2020-06-09 | 广西霄能绿色科技有限公司 | Venturi combustion nozzle for combusting biomass powder fuel |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111911961A (en) * | 2020-09-02 | 2020-11-10 | 西安交通大学 | Natural gas high-proportion hydrogen-blending combustion burner |
| CN111911961B (en) * | 2020-09-02 | 2021-07-06 | 西安交通大学 | Natural gas high-proportion hydrogen-blending combustion burner |
| CN112984554A (en) * | 2021-03-03 | 2021-06-18 | 中国人民解放军国防科技大学 | High-speed premixing jet flow flame combustion enhancing device based on gas ejector |
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