CN101793398B - Method for heating, cutting and welding metal by using ethylene as fuel - Google Patents
Method for heating, cutting and welding metal by using ethylene as fuel Download PDFInfo
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- CN101793398B CN101793398B CN 201010104522 CN201010104522A CN101793398B CN 101793398 B CN101793398 B CN 101793398B CN 201010104522 CN201010104522 CN 201010104522 CN 201010104522 A CN201010104522 A CN 201010104522A CN 101793398 B CN101793398 B CN 101793398B
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Abstract
The invention relates to a method for heating, cutting and welding a metal by using ethylene as fuel. The method comprises the following steps: A. increasing the pressure of liquid ethylene in an ethylene storage tank through a low-temperature liquid pump, then increasing the temperature to 0 DEG C through an air temperature type heater, and then carrying out steel bottle bottling through a filling line to obtain bottled ethylene; and B. respectively connecting an oxygen gas inlet and an ethylene gas inlet of a fuel gas handle with the outlets of an oxygen gas steel bottle and an ethylene steel bottle through pipelines. The invention saves more energy, reduces pollution, conforms to environmental requirements and improves the safety; the invention has easily realized technical scheme and lower production cost, generates a positive upgrading action for the prior art after being put on the market, relieves the problem of industrial gas resource shortage and conforms to the development trend of energy sources.
Description
Technical field
The present invention relates to the method that a kind of industrial combustion gas is used for METAL HEATING PROCESS, cutting and welding, especially relate to the method for carrying out METAL HEATING PROCESS, cutting and welding with ethylene as fuel.
Background technology
Fast development along with China's modernization industry, domestic pillar enterprises and private enterprise are flourish, industry cutting and welding spread all over city and country, the demand of industrial combustion gas increases day by day, weld, cut as a kind of general common technology, in manufacturing industry, by the processing technology of a considerable amount of enterprises as key, weld, cut the quality that quality is directly determining its product.
It is that fuel carries out METAL HEATING PROCESS, cutting and welding that prior art adopts acetylene more.In China, acetylene production mainly adopts carbide; Its major defect is complex manufacturing, and cost is high, energy consumption is large, seriously polluted, low, the explosive of safety coefficient in production and use procedure; The other awkward Compressed Gas of acetylene gas, can, store all very inconvenient.Be accompanied by the development of modernization industry, the consumption of industrial combustion gas increases sharply.The production of acetylene and use the harm that earth water resource and atmospheric environment and even human existence are caused increasingly severe is unfavorable for the sustainable development of national economy.For example, produce 1.5 tons in one ton of calcium carbide power consumption, 3500～3800 degree, coke, one ton of acetylene gas of every production will produce 3.5 tons of waste residues and 16 tons of waste water, and discharge a large amount of pernicious gases, be a large industrial pollution source.
Early 1970s, the state such as Japanese, American-European begins progressively to eliminate acetylene gas, the substitute is propane, propylene gas etc. and is the industrial combustion gas of main body.Doping and not additivated propane combustion gas the nineties also appearred in China successively, but because its flame temperature is low, preheating is slow, oxygen demand is large, can not realize the shortcoming such as steel to steel welding, and are mainly used in gas cutting, and mostly are used for machine cuts.Hand cut efficient is low, how not to adopt.Its instrument can not be general with the instrument that acetylene gas acts as a fuel, and namely can not use the acetylene cutting torch and use the propane cutting torch, and is very inconvenient in the practical operation.In addition, the propane cutting torch is porous, has increased gas consumption and oxygen consumption; Propane acts as a fuel usually to originate and differs, and purity can not guarantee, has raffinate during use in winter.
For high gas consumption, the high oxygen consumption of the high energy consumption, heavily contaminated, shortage security and the propane combustion gas that solve the acetylene combustion gas, use face is narrow and the problem such as raffinate is arranged, await inventing a kind of industrial gas and be used for the technique of METAL HEATING PROCESS, cutting and welding to overcome the existing defective of prior art.
Summary of the invention
The object of the present invention is to provide a kind of method of carrying out METAL HEATING PROCESS, cutting and welding with ethylene as fuel, the method is take ethene as main fuel, assistant improves security, the minimizing of operation and pollutes, reduces energy consumption with gas synergist when realizing METAL HEATING PROCESS, cutting and welding; Act as a fuel in METAL HEATING PROCESS, cutting and welding replaced acetylene combustion gas to solve the problems that exist in acetylene gas production, transportation, use and the subsequent treatment with ethene.
The objective of the invention is to be achieved through the following technical solutions: a kind of method of carrying out METAL HEATING PROCESS, cutting and welding with ethylene as fuel comprises the steps:
A, first with the liquid ethylene in the ethene storage tank through the cryogenic liquid pump pressure-raising, be warming up to 0 ℃ through the air temperature type heater again and undertaken by filling line that steel cylinder is canned to obtain bottled ethene;
B, with combustion gas the oxygen inlet of tool with ethylene gas import be connected and be connected outlet with the ethene steel cylinder with oxygen bottle and be connected with pipeline.
Described method of carrying out METAL HEATING PROCESS, cutting and welding with ethylene as fuel also comprises the steps:
C, in combustion gas the pipeline between tool and the ethene steel cylinder is installed a control valve, a gas synergist bottle is in parallel with pipeline with described control valve, and the filling weight of the gas synergist that described gas synergist bottle is interior is 40～60%;
D, enter combustion gas with control valve control and the gas synergist content in the ethylene gas of tool is regulated flame temperature carry out METAL HEATING PROCESS, cutting and welding operation.
The described line that fills is when filling the ethene steel cylinder, detect the empty bottle weight of ethene steel cylinder and filled the both quantitative full bottle of an ethene weight by filling sensor on the line, the sensor instrument shows and closes the by-pass valve control that fills that fills on the line when reaching the both quantitative full bottle of ethene weight.
The present invention compared with prior art has the following advantages:
1, compare with acetylene, the present invention is more energy-conservation, reduces and pollutes, and meets environmental requirement, improves security; Compare with propane, the present invention can reduce combustion gas, oxygen consumption, eliminates raffinate and enlarged the scope of application in winter.
2, the Work tool that uses in the operation of the present invention can be general with the Work tool of acetylene combustion gas, easy to utilize; Technical solution of the present invention realizes that easily production cost is lower, will produce to prior art the effect of positive update after putting goods on the market.
3, the present invention has improved in the past industrial combustion gas the problem of industrial combustion gas resource anxiety has been alleviated in the requirement of the energy, meets energy development trend.
4, ethylene gaseous fuel is widely used in the fields such as machinery, metallurgy, smelting, shipbuilding, building, five metals, electromechanics.
5, in the prior art, secondly 45% ethene be with ethylene production dichloroethanes and vinyl chloride for the production of polyethylene, and ethylene is prepared oxirane, ethylene glycol and acetaldehyde; In addition, the ethene hydrocarbonylation prepares styrene, and the ethene synthetic alcohol prepares higher alcohol etc. with ethene.Ethene can be avoided the problem of electric power resource deficiency as the appearance of New-type fuel, is the direction of industrial combustion gas future development.The present invention is pioneering both at home and abroad, has broken through the bottleneck of conventional art, and it is blank to have filled up industry, has remedied the deficiency in industrial combustion gas field, and wide market prospects are arranged, and has preferably Social benefit and economic benefit after the popularization.
Description of drawings
Fig. 1 is ethene bottling process chart;
Fig. 2 is the process chart of the embodiment of the invention one;
Fig. 3 is the process chart of the embodiment of the invention two.
The specific embodiment
Below in conjunction with embodiment the present invention is made a detailed description.
Embodiment 1: a kind of method of carrying out METAL HEATING PROCESS, cutting and welding with ethylene as fuel comprises the steps:
A, first with the liquid ethylene in the ethene storage tank through the cryogenic liquid pump pressure-raising, be warming up to 0 ℃ through the air temperature type heater again and undertaken by filling line that steel cylinder is canned to obtain bottled ethene; The cryogenic liquid pump that adopts in the present embodiment is cryogenic liquid reciprocating pump (model is BP0100-600/165), and the air temperature type heater is air temperature type high-pressure heater (model is YQK50/150).
Referring to Fig. 1 and Fig. 2, in the present embodiment, the liquid ethylene in the ethene storage tank, pressure is about 0.2Mpa, and temperature is about-90 ℃; Through cryogenic liquid reciprocating pump pressure-raising, be warming up to about 0 ℃ through the air temperature type high-pressure heater again, carry out through filling line that steel cylinder is canned to obtain bottled ethene again.When filling the ethene steel cylinder, by the sensor (weighting error 0.3% that fills on the line, the bottled error of 10Kg is 0.03Kg) detect the empty bottle weight of ethene steel cylinder and filled the both full bottle weight of quantitative ethene, the sensor instrument shows when reaching the full bottle of set ethene weight, then closes the by-pass valve control that fills that fills on the line.As shown in Figure 1, A line, B line, C line are ethene cylinder filling line, and A1, A2, A3 are the by-pass valve control that fills on the A line, and B1, B2, B3 are the by-pass valve control that fills on the B line, and C1, C2, C3 are the by-pass valve control that fills on the C line.
B, with combustion gas the oxygen inlet of tool with ethylene gas import be connected and be connected outlet with the ethene steel cylinder with oxygen bottle and be connected with pipeline.
Embodiment 2: a kind of method of carrying out METAL HEATING PROCESS, cutting and welding with ethylene as fuel comprises the steps:
A, first with the liquid ethylene in the ethene storage tank through the cryogenic liquid pump pressure-raising, be warming up to 0 ℃ through the air temperature type heater again and undertaken by filling line that steel cylinder is canned to obtain bottled ethene; The cryogenic liquid pump that adopts in the present embodiment is cryogenic liquid reciprocating pump (model is BP0100-600/165), and the air temperature type heater is air temperature type high-pressure heater (model is YQK50/150).
In the present embodiment, the liquid ethylene in the ethene storage tank, pressure is about 0.2Mpa, and temperature is about-90 ℃; Through cryogenic liquid reciprocating pump pressure-raising, be warming up to about 0 ℃ through the air temperature type high-pressure heater again, carry out through filling line that steel cylinder is canned to obtain bottled ethene again.When filling the ethene steel cylinder, by the sensor (weighting error 0.3% that fills on the line, the bottled error of 10Kg is 0.03Kg) detect the empty bottle weight of ethene steel cylinder and filled the both full bottle weight of quantitative ethene, the sensor instrument shows when reaching the full bottle of set ethene weight, then closes the by-pass valve control that fills that fills on the line.As shown in Figure 1, A line, B line, C line are ethene cylinder filling line, and A1, A2, A3 are the by-pass valve control that fills on the A line, and B1, B2, B3 are the by-pass valve control that fills on the B line, and C1, C2, C3 are the by-pass valve control that fills on the C line.
B, with combustion gas the oxygen inlet of tool with ethylene gas import be connected and be connected outlet with the ethene steel cylinder with oxygen bottle and be connected with pipeline;
C, in combustion gas the pipeline between tool and the ethene steel cylinder is installed a control valve, a gas synergist bottle is in parallel with pipeline with described control valve, and the filling weight of the gas synergist that described gas synergist bottle is interior is 40～60%;
D, enter combustion gas with control valve control and the gas synergist content in the ethylene gas of tool is regulated flame temperature carry out METAL HEATING PROCESS, cutting and welding operation.
Referring to Fig. 1 and Fig. 3, in the present embodiment, gas synergist is the IH-7 industrial gas synergist, and it is a kind of nontoxic, non-corrosive orange colour liquid.The volume that can select the gas synergist bottle is 1 liter, and is withstand voltage greater than 2Kg/cm
2, the gas synergist bottle can adopt transparent or opaque material is made; For ethylene gas is fully contacted with gas synergist, dividing plate or thread filler are set to avoid channel in the gas synergist bottle.For fear of gas synergist liquid with ethylene gas in the gas synergist bottle out, 40～60% volume space is reserved on gas synergist bottle top, namely volume is that the filling weight of gas synergist is 400ml～600ml in 1 liter the gas synergist bottle.
In METAL HEATING PROCESS, cutting and the welding operation of present embodiment, when valve wide open, enter combustion gas not containing gas synergist in the ethylene gas of tool, along with turning down gradually of valve, import in the ethylene gas pipeline behind the part ethylene gas process gas synergist bottle, at this moment enter combustion gas containing gas synergist in the ethylene gas of tool; Can come controlling opening of valve according to the different demands of METAL HEATING PROCESS, cutting, welding, and realize regulating flame temperature by the size of regulating the flame inner cone, satisfy action need.
In METAL HEATING PROCESS, cutting and welding operation, METAL HEATING PROCESS, cutting and welding be embodied in again more: baking correction, machine cuts and hand cut, welding etc.The flame temperature that the baking of sheet metal (thickness is less than a centimetre) weldment is proofreaied and correct can slightly be hanged down a bit, the flame temperature that the baking of steel plate (thickness is greater than two centimetres) weldment is proofreaied and correct requires height a bit, and the baking correct flame of Plate Welding spare is neutral flame; The steel plate that machine cuts is cut is grown (one to ten meter) usually, and this situation flame temperature is a little slightly low, does not substantially affect operating efficiency preheating time in long several seconds.During hand cut, it is less to be cut part, constantly changes and is cut part, and this situation flame temperature is slightly low, if preheating time, long meeting affect operating efficiency, flame temperature then requires relatively higher, and cutting flame is oxidizing flame; During welding operation, be necessary for neutral flame for guaranteeing welding quality flame, and the flame temperature that requires is higher.In order to improve combustion characteristics, accelerate burning velocity, to promote flame temperature, valve can be turned down gradually, import in the ethylene gas pipeline after making the part ethylene gas through the gas synergist bottle, at this moment enter combustion gas containing gas synergist in the ethylene gas in the tool; In practical operation, can reach the purpose of adjusting flame temperature according to the content of gas synergist in the different needs adjustment ethylene gas; When gas synergist content was 0.5% (mass percent) in the ethylene gas, flame temperature can improve about 500 degree.
Table one is for toasting corrections, entering combustion gas when welding the comparison that has or not the gas synergist experimental result in the ethylene gas of tool: table one
| Valve opening | In the ethylene gas | The flame temperature of ethylene gaseous fuel | Flame inner cone (neutral flame) | Baking is proofreaied and correct | Welding |
| Standard-sized sheet | Do not contain gas synergist | Slightly low | Bigger | The roasting red area of baking correcting member is smaller, shallow, and roasting red speed is slightly slow. | The width of welded part steel juice fusing is slightly narrow, shallow, and the speed of welding is slightly slow. |
| Turn down gradually | Contain gas synergist | High | Smaller | The roasting red area of baking correcting member is large, dark, roasting red speed. | The width of welded part steel juice fusing is slightly wide, dark, and the speed of welding is faster. |
In operation, the relation between flame status and the flame temperature can be judged by following description:
1, adjust flame status, the ratio of combustible (such as ethene) and oxidizer (oxygen) can be divided into three kinds to flame status: reducing flame, oxidizing flame and neutral flame during according to burning.Excessive when combustible (ethene), when oxidizer (oxygen) was not enough, it showed as over-emitting black exhaust, and this moment, flame status was reducing flame.Increase along with oxidizer (oxygen), be oxidizer (oxygen) by foot channel in right amount again to inexcessive, its macro manifestations is that black smoke reduces to gradually fully and eliminates, and flame is very large when disperseing is oxidizing flame very much, the process that flame status is adjusted to oxidizing flame by reducing flame is very fast, is referred to as coarse adjustment.Usually flame status is adjusted into neutral flame, all is to be adjusted into neutral flame by oxidizing flame, rather than is adjusted into neutral flame by reducing flame.The process that flame status is adjusted to neutral flame by oxidizing flame is slower, so be referred to as fine setting.The structure of flame can be divided into two parts: flame envelope (orange-yellow) and inner cone (blueness).Flame was very large when flame was oxidizing flame disperses very much, and flame envelope (orange-yellow) and inner cone (blueness) all disperse very much.Along with the gradually minimizing of oxidizer (oxygen), flame dwindles gradually, and flame envelope (orange-yellow) and inner cone (blueness) all dwindle gradually, until inner cone is constant, this moment, flame was neutral flame.
2, adjust flame temperature, for given combustible, the inner cone size is constant during neutral flame.For different combustibles, it is compacter that the inner cone that flame temperature is high during neutral flame shrinks, and inner cone is less.It is compact not that the inner cone that flame temperature is low during neutral flame shrinks, and inner cone just more greatly.In order to regulate the flame temperature of ethylene gaseous fuel, for the flame temperature of the ethylene gaseous fuel that raises, the way that we take is to add gas synergist in ethylene gas more precisely, is used for improving combustion characteristics, accelerates burning velocity, improves flame temperature.Along with the adding of gas synergist, what inner cone shrank when the flame status of ethylene gaseous fuel was neutral flame is compacter, and inner cone less (than not adding gas synergist) indicates that flame temperature is improved.
The technical problem underlying analysis of acetylene, ethylene gaseous fuel:
The acetylene combustion gas exists shortcomings and drawback in the practical operation, we have carried out ethene and acetylene combustion gas the comparative analysis of every key element in practical operation, through research experiment, we think that ethene is used for comparatively ideal of METAL HEATING PROCESS, cutting and welding as the substitute of acetylene.
Ethene, acetylene Comparison of experiment results be as shown in Table 2: table two
| Chemical formula | Molecular weight | Theoretical flame temperature | Burning velocity | Explosion limit (%) | Energy consumption | Environmental pollution | Safety hazard | |
| Acetylene | C 2H 2 | 26 | 3732℃ | Hurry up | 2.5-81 | High | Heavy | Greatly |
| Ethene | C 2H 4 | 28 | 3668℃ | Comparatively fast | 2.7-36.0 | Low | Gently | Little |
| Production cost | Cost of transportation | Use cost | Roasting | Cut tool | Cutting torch | Tip | ||
| Acetylene | High | High | High | Roasting of acetylene | Acetylene cuts tool | The acetylene cutting torch | The acetylene tip | |
| Ethene | Low | Low | Low | Roasting of acetylene | Acetylene cuts tool | The acetylene cutting torch | The acetylene tip | |
| Cutting speed | The cut surface roughness | The dross degree | Welding quality | Operational stability | Tempering phenomenon | Storage form |
| Acetylene | Normally | More flat | Dross is arranged | Very | Stable | Have | Steel cylinder solution filler | |
| Ethene | Normally | Smooth smooth | Substantially without dross | Very | Stable | Nothing | Steel cylinder |
Ethene, propane Comparison of experiment results be as shown in Table 3: table three
| Preheating time | Cutting torch | Flame temperature | Energy consumption | Range of application | ||
| Propane | Slowly | Propane cutting torch (porous) | Low | Gas consumption Duos 20% than the acetylene combustion gas, its oxygen consumption many 40% | Gas cutting | Low temperature has raffinate |
| Ethene | Comparatively fast | The acetylene cutting torch | Higher | Gas consumption, oxygen consumption are slightly more than the acetylene combustion gas, in 10% | METAL HEATING PROCESS, cutting, welding | All gasifications |
As above tabulation is analyzed, the major technique advantage of ethylene gaseous fuel have following some:
1, advanced person: cutting speed, effect surpass acetylene; Broken through the technical barrier of global function replaced acetylene, performance occupies first place in the world; The pioneering canned storing mode that has substituted existing acetylene combustion gas gas cylinder splendid attire of industrial combustion gas maintains the leading position.
2, economy: compare the cost decrease with acetylene; Its steel cylinder cost is 1/5 of acetylene; Bottle heavily is 1/3 of acetylene cylinder, can save freight charges 2/3; The switching rate of 15kg steel cylinder is 1/5 of acetylene.Avoid the shortcoming of traditional acetylene power consumption large and the high gas consumption of propane and high oxygen consumption, greatly saved cost.
3, high-quality: the welding Performance and quality meets or exceeds acetylene gas comprehensively, is better than similar welding gas performance.Cutting performance is good; Cutting section is smoothly bright and clean, and the limit of not collapsing is substantially without dross, not dry slag and very easily removing.
4, energy-conserving and environment-protective: the acetylene gas cost is high, large, seriously polluted, the explosive of energy consumption; Produce one ton of calcium carbide power consumption, 3500～3800 degree and 1.5 tons of coke, one ton of acetylene gas of every production produces 3.5 tons of waste residues and 16 tons of waste water, is a large industrial pollution source.The ethene of comparing is less expensive in producing, transport, using, and energy consumption is little, pollution is few.
5, safety: the explosion limit scope is 20% of acetylene, and is safer, not tempering.Acetylene gas in use safety coefficient is not high; Its awkward Compressed Gas, canning and storage and carrying are very inconvenient, and ethene adopts the steel cylinder safe transportation.
This shows that ethylene gaseous fuel is the work of the replaced acetylene combustion gas overwhelming majority substantially, and energy-conservation, reduce and pollute, improved security, met energy saving policy, environmental protection policy and the strategy of sustainable development of country, spread has significant economic benefit and social benefit.
Claims (2)
1. a method of carrying out METAL HEATING PROCESS, cutting and welding with ethylene as fuel is characterized in that, comprises the steps:
A, first with the liquid ethylene in the ethene storage tank through the cryogenic liquid pump pressure-raising, be warming up to 0 ℃ through the air temperature type heater again and undertaken by filling line that steel cylinder is canned to obtain bottled ethene, namely obtain being equipped with the ethene steel cylinder of ethene;
B, with combustion gas the oxygen inlet of tool with ethylene gas import be connected and be connected outlet with the ethene steel cylinder with oxygen bottle and be connected with pipeline;
C, in combustion gas the pipeline between tool and ethene steel cylinder serial connection one control valve, one gas synergist bottle is in parallel with pipeline with described control valve, the filling weight of the gas synergist in the described gas synergist bottle is 40～60% volume contents, and thread filler is set in the gas synergist bottle; Described parallel connection refers to that the air inlet end of gas synergist bottle is communicated with on the pipeline of control valve front, and the gas outlet end of gas synergist bottle is communicated with on the pipeline of control valve back;
The control of D, controlling opening of valve enters combustion gas and the gas synergist content in the ethylene gas of tool is regulated flame temperature carries out METAL HEATING PROCESS, cutting and welding operation; When valve wide open, enter combustion gas not containing gas synergist in the ethylene gas of tool; Along with turning down gradually of controlling opening of valve, import in the ethylene gas pipeline behind the part ethylene gas process gas synergist bottle, enter combustion gas containing gas synergist in the ethylene gas of tool; Described gas synergist is the IH-7 industrial gas synergist.
2. method of carrying out METAL HEATING PROCESS, cutting and welding with ethylene as fuel according to claim 1 is characterized in that: among the described step D, when gas synergist content was 0.5% mass content in the ethylene gas, flame temperature improved 500 degree.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3805819A (en) * | 1972-10-05 | 1974-04-23 | B Etter | Method and means of applying additives to industrial gas |
| GB1417500A (en) * | 1973-05-07 | 1975-12-10 | Etter Berwyn E | Method and means for applying additives to industrial fuel gas |
| CN2296792Y (en) * | 1997-07-04 | 1998-11-11 | 赵世民 | Cutting welder |
| CN1763417A (en) * | 2005-10-19 | 2006-04-26 | 马磊 | Liquefied natural gas charging device with automatic pressure regulation and gasification functions |
| CN201310744Y (en) * | 2008-07-16 | 2009-09-16 | 新奥(廊坊)燃气技术研究发展有限公司 | Movable type liquefied natural gas (LNG) emergency air supplying device |
-
2010
- 2010-02-01 CN CN 201010104522 patent/CN101793398B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3805819A (en) * | 1972-10-05 | 1974-04-23 | B Etter | Method and means of applying additives to industrial gas |
| GB1417500A (en) * | 1973-05-07 | 1975-12-10 | Etter Berwyn E | Method and means for applying additives to industrial fuel gas |
| CN2296792Y (en) * | 1997-07-04 | 1998-11-11 | 赵世民 | Cutting welder |
| CN1763417A (en) * | 2005-10-19 | 2006-04-26 | 马磊 | Liquefied natural gas charging device with automatic pressure regulation and gasification functions |
| CN201310744Y (en) * | 2008-07-16 | 2009-09-16 | 新奥(廊坊)燃气技术研究发展有限公司 | Movable type liquefied natural gas (LNG) emergency air supplying device |
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