CN109595550A - A kind of energy-saving and emission-reducing burner and combustion method - Google Patents
A kind of energy-saving and emission-reducing burner and combustion method Download PDFInfo
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- CN109595550A CN109595550A CN201710918154.2A CN201710918154A CN109595550A CN 109595550 A CN109595550 A CN 109595550A CN 201710918154 A CN201710918154 A CN 201710918154A CN 109595550 A CN109595550 A CN 109595550A
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- Prior art keywords
- gas
- burner
- combustion
- synergist
- energy
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/02—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/46—Details, e.g. noise reduction means
- F23D14/62—Mixing devices; Mixing tubes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K5/00—Feeding or distributing other fuel to combustion apparatus
- F23K5/002—Gaseous fuel
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N1/00—Regulating fuel supply
- F23N1/005—Regulating fuel supply using electrical or electromechanical means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K2201/00—Pretreatment of solid fuel
- F23K2201/50—Blending
- F23K2201/505—Blending with additives
Abstract
The invention discloses a kind of energy-saving and emission-reducing burners, its principle is to realize energy-saving and emission-reduction by improving flame temperature, including fuel conveying mechanism, synergist addition mechanism, burner and intelligent controller, synergist addition mechanism accesses the fuel conveying mechanism, the fuel conveying mechanism connects burner, the burner internal forms the mixture of combustion gas, combustion-supporting gas and synergist, the combustion-supporting gas is oxygen or air, and the fuel conveying mechanism, synergist addition mechanism connect intelligent controller.For traditional burner, the flame temperature that burner of the invention generates is significantly raised, improves the transmission efficiency of heat, reduces the use of fuel, saved production cost.
Description
Technical field
The present invention relates to thermal energy environmental technology fields, and in particular to a kind of energy-saving and emission-reducing burner and combustion method.
Background technique
After 2000, great change is had occurred in the fuel structure in China, is based on coal, now gradually in the past
It is changed to based on natural gas, propane, i.e., coal changes gas policy.It is advantageous to environmental protection that coal changes gas policy, is especially the reduction of powder
The discharge of dirt, but the content of carbon dioxide in flue gas is not decreased obviously but, some increases instead.For example, the cutting of steel,
Welding, heating etc., present 80% or more did not used acetylene and used propane all using acetylene as fuel the past, but due to propane
Flame temperature is low, inefficient, and the workload of one ton of acetylene needs 2-2.5 tons of propane that could replace, although saving using second
Electric power consumed by alkynes, but the consumption of propane is increased, waste the discharge amount that the energy increases carbon dioxide again.
In combustion, the calorific value of the consumed energy is greater than the required heat of main body production, generates in combustion furnace
Waste heat carries out the heat recovery of tail gas again, is lowered into the exhaust temperature of chimney, reaches energy-efficient purpose, but can not
Emission reduction.In addition, waste heat is irretrievable in some combustion processes, such as steel cutting and deformation school in ferrous metal processing
Just, the process of the processing of glassware, vacuum cup production, crystal hanging.Therefore really effective energy conservation, emission reduction must be from
It works hard on source, while meeting heat required for main body production, reduces the quantity of energy of consumption, greatly reduce tail gas,
It achieves energy-saving and emission reduction purposes.
Summary of the invention
Technical problem to be solved by the invention is to provide a kind of energy-saving and emission-reducing burners, it can solve existing skill
Energy consumption and the big problem of exhaust emissions amount during fuel combustion in art.In addition, the present invention also provides a kind of energy conservation
Emission reduction type combustion method realizes energy conservation and emission reduction by improving flame temperature.
To solve the above-mentioned problems, the invention adopts the following technical scheme:
The first aspect of the present invention provides a kind of energy-saving and emission-reducing burner, including fuel conveying mechanism, synergist add machine
Structure, burner and intelligent controller, synergist addition mechanism access the fuel conveying mechanism, the fuel conveying mechanism
Connect burner, the burner internal forms the mixture of combustion gas, combustion-supporting gas and synergist, the combustion-supporting gas be oxygen or
Air, the fuel conveying mechanism, synergist addition mechanism connect intelligent controller.
Preferred technical solution, the burner are pre-mixing type combustion apapratus, and the fuel conveying mechanism includes fuel gas transmission
Pipe and the gas phase homo-mixer on gas supply pipe, synergist addition mechanism include synergist storage tank, micro pump,
The micro pump connection synergist storage tank and gas supply pipe.
Preferred technical solution, the fuel gas transportation pipeline connect first flowmeter, the gas phase homo-mixer connection
Heater, the first flowmeter, micro pump connect intelligent controller.
Preferred technical solution, the burner are diffusion flame burner, and the fuel conveying mechanism includes fuel gas transmission
Pipeline helps fuel gas transportation pipeline, blender, and the fuel gas transportation pipeline helps fuel gas transportation pipeline to be separately connected the blender,
The blender connects the diffusion flame burner, and the synergist addition mechanism includes synergist storage tank, micro pump, described micro-
Amount pump connection synergist storage tank and gas supply pipe, the fuel gas transportation pipeline are equipped with gas phase homo-mixer.
Preferred technical solution, the fuel gas transportation pipeline connection first flowmeter and first flow valve, the combustion-supporting gas
Conveyance conduit connects second flowmeter and second flow valve, and the gas phase homo-mixer connects heater, the first flow
Meter, first flow valve, second flowmeter, second flow valve and micro pump connect intelligent controller.
The second aspect of the present invention provides a kind of energy-saving and emission-reducing combustion method, is burnt and is filled using above-mentioned energy-saving and emission-reducing
It sets, comprising the following steps: after mixing combustion gas, combustion-supporting gas, synergist in proportion, in burning in burner, burn gained
Heat is used for hot work operation.
Preferred technical solution, the synergist be pure and mild hydrocarbon mixture, the alcohol be selected from selected from methanol, ethyl alcohol,
One of 9 higher alcohols of isopropanol or 4~C of C or more than one any mixture, the hydrocarbon are selected from hexane, toluene, two
One of 11 hydrocarbon of toluene, trimethylbenzene or 9~C of C or more than one any mixture.
The weight ratio of preferred technical solution, the synergist and combustion gas is (1.0~3.0): 100.
Preferred technical solution, the combustion-supporting gas are oxygen, and the volume ratio of the oxygen and combustion gas is (75~200): 100
。
Preferred technical solution, the combustion-supporting gas are air, and the volume ratio of the air and combustion gas is (400~1000):
100。
The burning of hydro carbons is a kind of free radical chain reactions, and burned flame temperature is related with the speed of burning, and burns
The speed of speed depends on the original state of free radical chain reactions, that is, releases the speed of first free radical.Hydrocarbon fuel speed
It spends as shown in table 1 with the relationship of flame temperature.It is well known that alkynes be it is most active, it is finally alkane that base, which time is alkene, because
And acetylene, propylene, propane, natural gas (methane) weight calorific value very close in the case where, due to the difference of burning velocity, fire
The temperature of flame is also different.
The relationship of table 1 hydrocarbon fuel speed and flame temperature
For methane flame, important initial phase are as follows:
CH4+OH=CH3+H20 and CH4+H=CH3+H2
Two reactions after are as follows:
CH3+O2=CH2O+OH and CH3+0=CH20+H
The stage also includes CH0, HO afterwards2With the further reaction of CO, it should be noted that this kind of reaction chain needs starting
OH free radical cause.In order to improve burned flame temperature, first main points of this patent: synergist accelerated combustion is utilized
Free radical chain reactions, improve flame temperature.
In order to improve burned flame temperature, it is necessary to it is sufficiently mixed oxygen with combustion gas, makes intermolecular close contact, because
Combustion process is the oxidation reaction of hydro carbons, if oxygen molecule and combustion gas molecule are unable to close contact, synergist can not just be acted as
With cannot also improve flame temperature.In the field of flame, premixed flames and Diffusion flame are divided into combustion flame
Two kinds, premixed flames second main points of this patent: must be used.
Second main points of the invention are realized by following scheme:
If what furnace, kiln were equipped with is pre-mixing type combustion apapratus, it is only necessary to increase synergist on fuel gas transportation pipeline and add mechanism, make
Combustion gas is sufficiently mixed with synergist, that is, can reach the purpose for improving flame temperature.
If what furnace, kiln were equipped with is diffusion flame burner, must be transformed.Reforming mode has two kinds:
1, diffusion flame burner is changed to pre-mixing type combustion apapratus.
2, it is changed without original diffusion flame burner, is transformed on air inlet pipeline: by original combustion-supporting letter shoot
Road and fuel gas transportation pipeline access blender, enter back into original diffusion flame burner after being in proportion sufficiently mixed two kinds of gases.
The invention has the benefit that for (1) is compared to traditional burner, what burner of the invention generated
Flame temperature is significantly raised, improves the transmission efficiency of heat, reduces the use of fuel, saved production cost.
(2) yield for reducing carbon dioxide and waste heat, is more energy-saving and environmentally friendly.
(3) applied widely, it need to be only transformed on original burner, improvement cost is low, easy to spread.
Detailed description of the invention
Invention is further described in detail with specific embodiment with reference to the accompanying drawing.
Fig. 1 is the structural schematic diagram of 1 energy-saving and emission-reducing burner of the embodiment of the present invention；
Fig. 2 is the structural schematic diagram of 2 energy-saving and emission-reducing burner of the embodiment of the present invention.
Wherein, appended drawing reference is described as follows: fuel gas transportation pipeline 1, gas phase homo-mixer 2, pre-mixing type combustion apapratus
3, intelligent controller 4, micro pump 5, synergist storage tank 6, first flowmeter 7, heater 8, first flow valve 9, help fuel gas transmission
Pipeline 10, second flowmeter 11, second flow valve 12, blender 13, diffusion flame burner 14.
Specific embodiment
Embodiment 1
As shown in Figure 1, the energy-saving and emission-reducing burner of the present embodiment is transformed on the basis of diffusion flame burner 14,
Including fuel gas transportation pipeline 1, help fuel gas transportation pipeline 10, blender 13 and diffusion flame burner 14, fuel gas transportation pipeline 1 with help
Fuel gas transportation pipeline 10 each leads into blender 13, and diffusion flame burner 14 is sent into after blender 13 is sufficiently mixed and is fired
It burns.Fuel gas transportation pipeline 1 connects synergist and adds mechanism, and it includes synergist storage tank 6, micro pump 5, synergy that synergist, which adds mechanism,
Agent storage tank 6 connects micro pump 5, and micro pump 5 connects fuel gas transportation pipeline 1, and fuel gas transportation pipeline 1 is equipped with gas phase homo-mixer
2, gas phase homo-mixer 2 connects heater 8, and synergist uniformly mixes after micro pump 5 is passed through fuel gas transportation pipeline 1 through gas phase
Device 2 is sufficiently mixed with combustion gas.Fuel gas transportation pipeline 1 connects first flowmeter 7 and first flow valve 9, helps fuel gas transportation pipeline 10
Connect second flowmeter 11 and second flow valve 12, gas phase homo-mixer 2 connects heater 8, first flowmeter 7, first-class
It measures valve 9, second flowmeter 11, second flow valve 12 and micro pump 5 and connects intelligent controller 4.
Embodiment 2
As shown in Fig. 2, the energy-saving and emission-reducing burner of the present embodiment is transformed on the basis of pre-mixing type combustion apapratus 3,
Mechanism, fuel gas transportation pipeline 1 are added including pre-mixing type combustion apapratus 3, fuel gas transportation pipeline 1, gas phase homo-mixer 2 and synergist
Pre-mixing type combustion apapratus 3 is connected, synergist addition mechanism includes synergist storage tank 6, micro pump 5, and synergist storage tank 6 connects micro pump
5, micro pump 5 connects fuel gas transportation pipeline 1, and fuel gas transportation pipeline 1 is equipped with gas phase homo-mixer 2, gas phase homo-mixer 2
Heater 8 is connected, synergist is sufficiently mixed through gas phase homo-mixer 2 and combustion gas after micro pump 5 is passed through fuel gas transportation pipeline 1
It closes, mixed combustion gas is sent into pre-mixing type combustion apapratus 3 and burns.Wherein, fuel gas transportation pipeline 1 is equipped with first flowmeter 7,
First flowmeter 7 connect intelligent controller 4 with micro pump 5.
Embodiment 3
The present embodiment carries out combustion test using the energy-saving and emission-reducing burner of embodiment 1, and wherein combustion gas uses natural gas, helps
Combustion gas uses air, and synergist is configured by methanol 20%, ethyl alcohol 20%, toluene 30% and dimethylbenzene 30%, the addition of synergist
Amount is the 1% of natural gas weight, and the volume ratio of air and natural gas is 700:100.
In order to verify the present embodiment effect, under conditions of other factors are all the same, comparative example is using the expansion before not being transformed
Formula burner is dissipated, test result is shown in Table 2.
Table 2
As seen from the above table, the necessary condition for improving flame temperature is synergist to be added into combustion gas, and combustion-supporting gas is filled with synergist
The mixing divided.
Embodiment 4
The present embodiment carries out combustion test using the energy-saving and emission-reducing burner of embodiment 1, and wherein combustion gas uses natural gas, helps
Combustion gas uses oxygen, and synergist is configured by methanol 20%, ethyl alcohol 20%, toluene 30% and dimethylbenzene 30%, the addition of synergist
Amount is the 1% of natural gas weight, and the volume ratio of oxygen and natural gas is 170:100.
In order to verify the present embodiment effect, under conditions of other factors are all the same, comparative example is using the expansion before not being transformed
Formula burner is dissipated, test result is shown in Table 3.
Table 3
It is found that for compared to air, using oxygen as combustion-supporting gas, flame temperature is higher, and is being added for contrast table 2 and table 3
After synergist, the promotion amplitude of flame temperature is bigger.
Embodiment 5
The present embodiment carries out cutting test using the energy-saving and emission-reducing burner of embodiment 2.
Cutting material: AH32 steel plate, material thickness: 20mm.
Cutting gas: station-service propane and the natural gas for adding synergist.
Synergist: methanol 20%, higher alcohols 40%, hexane 30% and dimethylbenzene 10% configure.
Combustion-supporting gas: oxygen.Test result is shown in Table 4.
Table 4
As seen from the above table, when cutting, for embodiment 5 is compared to station-service propane, energy conservation 54.8%.
Embodiment 6
The present embodiment carries out cutting test using the energy-saving and emission-reducing burner of embodiment 2.
Cutting material: AH32 steel plate, material thickness: 20mm.
Cutting gas: station-service natural gas and the natural gas for adding synergist.
Synergist: methanol 20%, ethyl alcohol 20%, toluene 30% and dimethylbenzene 30% configure.
Combustion-supporting gas: oxygen.Test result is shown in Table 5.
Table 5
As seen from the above table, when cutting, for embodiment 6 is compared to station-service natural gas, energy conservation 56.52%.
Embodiment 7
The present embodiment carries out test of warming oneself by a fire using the energy-saving and emission-reducing burner of embodiment 1.
It warms oneself by a fire gas: station-service propane and the natural gas for adding synergist.
Synergist: hexane 85%, ethyl alcohol 5%, isopropanol 5% and C9~C11 hydrocarbon 5% configure.
Combustion-supporting gas: oxygen.Test result is shown in Table 6.
As seen from the above table, when warming oneself by a fire, for embodiment 7 is compared to station-service propane, energy conservation 42.2%.
Embodiment 8
The present embodiment carries out soldering test using the energy-saving and emission-reducing burner of embodiment 1.
Welding gas: station-service propane and the natural gas for adding synergist.
Synergist: methanol 20%, ethyl alcohol 20%, toluene 30% and dimethylbenzene 30% configure.
Combustion-supporting gas: oxygen.Test result is shown in Table 7.
Table 7
As seen from the above table, when welding, for embodiment 8 is compared to station-service propane, energy conservation 54.75%.
Embodiment 9
The present embodiment carries out glass manufacture energy consumption test using the energy-saving and emission-reducing burner of embodiment 2.
Combustion gas: civil liquefied gas and the natural gas for adding synergist.
Synergist: methanol 20%, ethyl alcohol 20%, toluene 30% and dimethylbenzene 30% configure.
Combustion-supporting gas: oxygen.Test result is shown in Table 8.
Table 8
As seen from the above table, in glass manufacturing, for embodiment 8 is compared to civil liquefied gas, energy conservation 32%.
Embodiment 10
The present embodiment is tested on family's assistor for domestic gas stove using the energy-saving and emission-reducing burner of embodiment 1.
Combustion gas: civil natural gas and the natural gas for adding synergist.
Synergist: methanol 40%, ethyl alcohol 20%, dimethylbenzene 30%, 4~C of C, 9 hydrocarbon 10% configure.
Combustion-supporting gas: air.Experimental result is shown in Table 9.
Table 9
As seen from the above table, on assistor for domestic gas stove, for embodiment 10 is compared to civil natural gas, energy conservation 15.2%.
The row that all make using natural gas or propane fuel the present disclosure additionally applies for communications and transportation, fuel gas generation, stove etc.
Industry field reaches energy-saving and emission-reduction.
Use above specific case is illustrated the present invention, is merely used to help understand the present invention, not to limit
The system present invention.For those skilled in the art, according to the thought of the present invention, can also make several simple
It deduces, deform or replaces.
Claims (10)
1. a kind of energy-saving and emission-reducing burner, which is characterized in that realize energy-saving and emission-reduction, including fuel by improving flame temperature
Conveying mechanism, synergist addition mechanism, burner and intelligent controller, synergist addition mechanism access the fuel conveying
Mechanism, the fuel conveying mechanism connect burner, and the burner internal forms combustion gas, the mixing of combustion-supporting gas and synergist
Object, the combustion-supporting gas are oxygen or air, and the fuel conveying mechanism, synergist addition mechanism connect intelligent controller.
2. a kind of energy-saving and emission-reducing burner as described in claim 1, it is characterised in that: the burner is premixed combustion
Burner, the fuel conveying mechanism include gas supply pipe and the gas phase homo-mixer on gas supply pipe, the increasing
Effect agent addition mechanism includes synergist storage tank, micro pump, and the micro pump is connected to synergist storage tank and gas supply pipe.
3. a kind of energy-saving and emission-reducing burner as claimed in claim 2, it is characterised in that: the fuel gas transportation pipeline connection
First flowmeter, the gas phase homo-mixer connect heater, and the first flowmeter, micro pump connect intelligent controller.
4. a kind of energy-saving and emission-reducing burner as described in claim 1, it is characterised in that: the burner is diffusion type combustion
Burner, the fuel conveying mechanism include fuel gas transportation pipeline, help fuel gas transportation pipeline, blender, the fuel gas transportation pipeline,
Fuel gas transportation pipeline is helped to be separately connected the blender, the blender connects the diffusion flame burner, and the synergist adds
Adding mechanism includes synergist storage tank, micro pump, and the micro pump is connected to synergist storage tank and gas supply pipe, the fuel gas transmission
Pipeline is equipped with gas phase homo-mixer.
5. a kind of energy-saving and emission-reducing burner as claimed in claim 4, it is characterised in that: the fuel gas transportation pipeline connection
First flowmeter and first flow valve, it is described to help fuel gas transportation pipeline connection second flowmeter and second flow valve, the gas phase
Homo-mixer connects heater, the first flowmeter, first flow valve, second flowmeter, second flow valve and micro pump
Connect intelligent controller.
6. a kind of energy-saving and emission-reducing combustion method, using the described in any item energy-saving and emission-reducing burners of Claims 1 to 5,
Characterized by comprising the following steps: after combustion gas, combustion-supporting gas, synergist are mixed in proportion, in burning in burner,
Burning gained heat is used for hot work operation.
7. a kind of energy-saving and emission-reducing combustion method as claimed in claim 6, it is characterised in that: the synergist is pure and mild hydrocarbon
Mixture, the alcohol be selected from selected from one of methanol, 9 higher alcohols of ethyl alcohol, isopropanol or 4~C of C or more than one
Any mixture, the hydrocarbon be selected from one of hexane, toluene, 11 hydrocarbon of dimethylbenzene, trimethylbenzene or 9~C of C or it is a kind of with
On any mixture.
8. a kind of energy-saving and emission-reducing combustion method as claimed in claim 6, it is characterised in that: the weight of the synergist and combustion gas
Amount is than being (1.0~3.0): 100.
9. a kind of energy-saving and emission-reducing combustion method as claimed in claim 6, it is characterised in that: the combustion-supporting gas is oxygen, institute
The volume ratio for stating oxygen and combustion gas is (75~200): 100.
10. a kind of energy-saving and emission-reducing combustion method as claimed in claim 6, it is characterised in that: the combustion-supporting gas is air, institute
The volume ratio for stating air and combustion gas is (400~1000): 100.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710918154.2A CN109595550A (en) | 2017-09-30 | 2017-09-30 | A kind of energy-saving and emission-reducing burner and combustion method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710918154.2A CN109595550A (en) | 2017-09-30 | 2017-09-30 | A kind of energy-saving and emission-reducing burner and combustion method |
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| CN109595550A true CN109595550A (en) | 2019-04-09 |
Family
ID=65956290
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|---|---|---|---|
| CN201710918154.2A Pending CN109595550A (en) | 2017-09-30 | 2017-09-30 | A kind of energy-saving and emission-reducing burner and combustion method |
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| CN1439696A (en) * | 2003-03-18 | 2003-09-03 | 徐连蕴 | Alcohol based mixed gas and its preparation |
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| CN201059599Y (en) * | 2007-06-11 | 2008-05-14 | 温小繁 | Gun welder igniter |
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| WO2012148441A1 (en) * | 2011-04-25 | 2012-11-01 | Aether Dbs | System and method for blending biogas |
| CN202684279U (en) * | 2012-08-10 | 2013-01-23 | 天津滨海新区金火焰科技有限公司 | Novel gas-fired cutting device |
| CN104302432A (en) * | 2012-05-14 | 2015-01-21 | 依赛彼集团公司 | Universal head-mix swirl injector for gas torch |
| CN204689964U (en) * | 2015-06-01 | 2015-10-07 | 沈阳荣林科技发展有限公司 | Additive for welding-cutting gas of metal mixing device |
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Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1439696A (en) * | 2003-03-18 | 2003-09-03 | 徐连蕴 | Alcohol based mixed gas and its preparation |
| CN1537925A (en) * | 2003-10-22 | 2004-10-20 | 贵州七星科技发展有限公司 | Safety environmental protection industrial welding cutting gas using matural gas as main raw material |
| CN201059599Y (en) * | 2007-06-11 | 2008-05-14 | 温小繁 | Gun welder igniter |
| CN201897579U (en) * | 2010-11-24 | 2011-07-13 | 广州市建筑材料工业研究所有限公司 | Flow control device for simulated fire brand |
| WO2012148441A1 (en) * | 2011-04-25 | 2012-11-01 | Aether Dbs | System and method for blending biogas |
| CN104302432A (en) * | 2012-05-14 | 2015-01-21 | 依赛彼集团公司 | Universal head-mix swirl injector for gas torch |
| CN202684279U (en) * | 2012-08-10 | 2013-01-23 | 天津滨海新区金火焰科技有限公司 | Novel gas-fired cutting device |
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