CN110713856A - Flame cutting gas using natural gas as raw material - Google Patents
Flame cutting gas using natural gas as raw material Download PDFInfo
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- CN110713856A CN110713856A CN201911026207.5A CN201911026207A CN110713856A CN 110713856 A CN110713856 A CN 110713856A CN 201911026207 A CN201911026207 A CN 201911026207A CN 110713856 A CN110713856 A CN 110713856A
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- natural gas
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L3/00—Gaseous fuels; Natural gas; Synthetic natural gas obtained by processes not covered by subclass C10G, C10K; Liquefied petroleum gas
- C10L3/003—Additives for gaseous fuels
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L3/00—Gaseous fuels; Natural gas; Synthetic natural gas obtained by processes not covered by subclass C10G, C10K; Liquefied petroleum gas
- C10L3/06—Natural gas; Synthetic natural gas obtained by processes not covered by C10G, C10K3/02 or C10K3/04
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- Oil, Petroleum & Natural Gas (AREA)
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- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Liquid Carbonaceous Fuels (AREA)
Abstract
The invention relates to the technical field of metal flame cutting, in particular to flame cutting gas taking natural gas as a raw material. The flame cutting gas is prepared from liquefied natural gas and an additive, wherein the additive comprises the following components in parts by weight: 35-60 parts of ethyl acetate, 16-30 parts of pentene, 15-20 parts of n-pentane, 10-20 parts of cyclohexane and 2-6 parts of sorbitan oleate. The flame cutting gas taking the natural gas as the raw material provided by the invention has the advantages that the additive is low in price and easy to purchase, and enough intermediate chemical bodies can be provided for the combustion of the natural gas, so that the combustion speed of the natural gas in oxygen is increased, and the combustion temperature is further increased; the cutting gas has the characteristics of simple production process, safe use, no tempering during cutting use and the like, has lower specific gravity than air, and can be used for indoor operation.
Description
Technical Field
The invention relates to the technical field of metal flame cutting, in particular to flame cutting gas taking natural gas as a raw material.
Background
At present, the industrial cutting is mainly performed by acetylene gas and propane, however, the raw material of acetylene, namely calcium carbide, is obtained by six times of energy conversion, the average power consumption of 1 ton of calcium carbide produced reaches 3300-3500 kWh and 1 ton of coke, and the serious pollution of the waste slag to the ecological environment becomes a social problem which is widely concerned. Acetylene gas has high energy consumption and high cost, is flammable and explosive, seriously damages resources and pollutes the environment; the cutting speed and quality of the propane cutting are affected due to the fact that the cutting gas is low in combustion temperature, the cutting gas is heavier than air and is easy to gather, the risk of accidents is high, the fatal risk that the propane cutting cannot be operated in a limited space exists, and therefore the propane cutting method is not widely popularized in China; natural gas flame cutting has been used in many areas, but has not been widely popularized due to the adverse factors of high price, complex production process and unstable product quality. Patent number 2015 of Wangmai inventor's flame cutting gas using natural gas as raw material: ZL.201510227209.6 solves the key problem of natural gas cutting flame temperature, but has the problems of high production cost, difficulty in purchasing additive raw materials and the like.
Natural gas is widely applied to the industrial field as a green and environment-friendly energy source, and natural gas cutting is to preheat metal at a workpiece cutting position to a certain temperature by using heat energy of natural gas combustion flame and then spray high-speed cutting oxygen flow to burn the metal at the preheating position and release heat to carry out cutting. Natural gas flame cutting is a process combining the chemical process of burning Fe in steel in high purity oxygen with the physical process of slag removal by means of a cutting oxygen stream, the metal cut being mostly low carbon steel. The essence of natural gas flame cutting is that the material being cut is burned in pure oxygen, not a melting process.
The whole gas flame cutting process can be divided into 4 mutually related stages: (1) heating the metal surface at the starting point to an ignition point by using preheating flame, and starting combustion reaction in cutting oxygen; (2) the combustion reaction progresses towards the lower metal layer; (3) removing slag generated by the combustion reaction, and cutting off metal along the thickness direction; (4) the metal upper layer at the front edge of the notch is heated to an ignition point by using the heat of the slag and the preheating flame, so that the metal upper layer is continuously subjected to combustion reaction with oxygen. The above four processes are repeated, and the metal cutting is continuously performed.
The natural gas has low boiling point (-161 deg.C), no influence of ambient temperature, no gasification problem, and low heat value (35.32 MJ/m)3) The flame temperature in oxygen is only 2538 ℃, which cannot meet the requirements of gas cutting. In the prior art, a combustion-supporting additive is usually added, the additive is mixed with natural gas according to a certain proportion, an original cutting torch is not changed, and a special cutting nozzle is matched, so that the flame temperature of the natural gas is improved. However, the existing combustion-supporting additives are various in types and unstable in performance, and therefore, development of the combustion-supporting additives is urgently neededA novel flame cutting gas which can be used for metal cutting and takes natural gas as a raw material is provided to meet the requirements of people.
Disclosure of Invention
Aiming at the problems, the invention provides the flame cutting gas which is safe to use and takes natural gas as a raw material and is added with the additive, the additive and the natural gas jointly participate in the combustion reaction in oxygen, and an intermediate chemical body is provided for the combustion of the natural gas, so that the combustion speed of the natural gas in the oxygen is improved, and further the combustion temperature is improved. In order to achieve the above object, the present invention provides a flame cutting gas using natural gas as a raw material, which is composed of liquefied natural gas and an additive; the additive consists of ethyl acetate, pentene, n-pentane, cyclohexane and sorbitan oleate.
The flame cutting gas is prepared from liquefied natural gas and an additive, wherein the additive comprises the following components in parts by weight:
the sum of the above components is 100 parts by weight.
Preferably, the cutting gas consists of liquefied natural gas and an additive, wherein the additive consists of the following components in parts by weight:
the sum of the above components is 100 parts by weight.
Further, the flame cutting gas taking natural gas as a raw material is composed of the following components in parts by weight: 99.4 to 99.7 portions of liquefied natural gas and 0.3 to 0.6 portion of additive, wherein the sum of the components is 100 portions by weight. .
The invention also aims to provide the preparation method of the flame cutting gas by using the natural gas as the raw material.
A method for preparing flame cutting gas by taking natural gas as raw material comprises the following steps:
step 1, adding ethyl acetate, amylene, n-pentane, cyclohexane and sorbitan oleate serving as raw material components of the additive into a container, mixing, filtering to obtain the additive,
the additive comprises the following components in parts by weight:
2-6 parts of sorbitan oleate, wherein the sum of the components is 100 parts by weight.
Step 2, adding the additive into the liquefied natural gas according to the formula proportion, uniformly mixing the additive and the liquefied natural gas to obtain liquid-phase flame cutting gas with the natural gas as a raw material,
the flame cutting gas taking natural gas as a raw material comprises the following components in parts by weight: 99.4 to 99.7 portions of liquefied natural gas and 0.3 to 0.6 portion of additive, wherein the sum of the components is 100 portions by weight.
Preferably, in the step 2, the additive is added into the liquefied natural gas according to the formula ratio, and the mixture is mixed for 40 minutes to obtain the flame cutting gas with the natural gas as the raw material in the liquid phase.
The use method of the flame cutting gas taking natural gas as the raw material comprises the following steps: when the natural gas cutting gas is used, the natural gas cutting gas can be compressed into a CNG steel cylinder by using an LNG low-temperature bottle or gasifying the natural gas cutting gas, and then the CNG steel cylinder is sent to a station for use, and can also be used in a pipeline gas supply mode.
Compared with the prior art, the invention has the beneficial effects that:
the flame cutting gas taking natural gas as the raw material provided by the invention is safe to use, is not tempered during cutting use, has lower specific gravity than air, and can be used for indoor operation. The method has the following specific advantages: (1) the cutting temperature is high: the temperature of the cutting gas burning in oxygen can reach 3380 ℃. (2) The cutting speed is high: in a cutting comparison experiment, the cutting gas disclosed by the invention is found to completely meet the high-temperature heating requirements of metal cutting and the like when the cutting speed is higher than 10% of acetylene. (3) The cutting quality is good: the cutting gas does not collapse and hang a pool during cutting, the section of the cut is smooth as a mirror, the cutting seam is thin, and the process precision is high. (4) The safety performance is good: because the explosion limit of natural gas is 5.3-14%, the explosion limit of acetylene is 2.5-80%, and the natural gas is not 1/7 of acetylene; natural gas is also lighter than acetylene and diffuses faster after leakage than acetylene. (5) The social and economic benefits are high: the natural gas belongs to clean energy, and has low price and convenient purchase; all raw materials of additives such as ethyl acetate, amylene, n-pentane, cyclohexane, sorbitan oleate and the like belong to common chemical products; patent number "a flame cutting gas using natural gas as raw material" invented by Wangmai: zl.2015102272096, required additive ingredients: the diphenyl carbinol and the n-propyl cyclohexanol belong to fine chemical products, and have complex production process, high price and difficult purchase. According to the patent number of 'a flame cutting gas using natural gas as raw material' invented by Wangmai: ZL.201510227209.6, required additive components and additive dosage, the cost of the additive of the invention is less than 30%, and the cost can be greatly reduced.
Detailed Description
The following non-limiting examples are presented to enable those of ordinary skill in the art to more fully understand the present invention and are not intended to limit the invention in any way.
The test methods described in the following examples are all conventional methods unless otherwise specified; the reagents and materials are commercially available, unless otherwise specified.
Example 1
The embodiment provides flame cutting gas taking natural gas as a raw material, which is composed of the following components in parts by weight: 99.7 parts of liquefied natural gas and 0.3 part of additive; the additive is composed of the following components in parts by weight: ethyl acetate (46 parts), pentene (18 parts), n-pentane (18 parts), cyclohexane (15 parts), and sorbitan oleate (3 parts).
The preparation method of the flame cutting gas with natural gas as the raw material comprises the following steps:
step 1, adding raw material components of ethyl acetate (46 parts), pentene (18 parts), n-pentane (18 parts), cyclohexane (15 parts) and sorbitan oleate (3 parts) of the additive into a container, mixing and filtering to obtain the additive.
And 2, adding 0.3 part of additive into 99.7 parts of liquefied natural gas in the LNG tank, and mixing for 40 minutes to obtain the liquid-phase flame cutting gas taking the natural gas as the raw material.
The use method of the flame cutting gas taking natural gas as the raw material comprises the following steps: when in use, the natural gas is supplied to the LNG low-temperature steel cylinder (liquefied natural gas low-temperature steel cylinder) for flame cutting gas by using the natural gas as the raw material, and the LNG low-temperature steel cylinder is delivered to a station for use.
The performance test of the flame cutting gas using natural gas as the raw material provided in this embodiment:
the use properties of the flame cutting gas using natural gas as the raw material in this example were examined by the cutting test of the steel sheet, and the results are shown in table 1.
Table 1: and (5) steel plate cutting test results.
Example 2
The embodiment provides flame cutting gas taking natural gas as a raw material, which is composed of the following components in parts by weight: 99.6 parts of liquefied natural gas and 0.4 part of additive; the additive is composed of the following components in parts by weight: ethyl acetate (52 parts), pentene (16 parts), n-pentane (16 parts), cyclohexane (13 parts), sorbitan oleate (3 parts). The preparation method is the same as example 1.
Example 3
The embodiment provides flame cutting gas taking natural gas as a raw material, which is composed of the following components in parts by weight: 99.5 parts of liquefied natural gas and 0.5 part of additive; the additive is composed of the following components in parts by weight: ethyl acetate (50 parts), pentene (17 parts), n-pentane (15 parts), cyclohexane (15 parts), and sorbitan oleate (3 parts). The preparation method is the same as example 1.
Example 4
The embodiment provides flame cutting gas taking natural gas as a raw material, which is composed of the following components in parts by weight: 99.4 parts of liquefied natural gas and 0.6 part of additive; the additive is composed of the following components in parts by weight: ethyl acetate (55 parts), pentene (16 parts), n-pentane (16 parts), cyclohexane (11 parts), sorbitan oleate (2 parts). The preparation method is the same as example 1.
Claims (5)
1. A flame cutting gas using natural gas as raw material is characterized in that: the cutting gas consists of liquefied natural gas and additives,
the additive comprises the following components in parts by weight:
the sum of the above components is 100 parts by weight.
2. The cutting gas as set forth in claim 1, wherein: the additive comprises the following components in parts by weight:
the sum of the above components is 100 parts by weight.
3. The cutting gas as set forth in claim 1, wherein: the flame cutting gas taking natural gas as a raw material comprises the following components in parts by weight: 99.4 to 99.7 portions of liquefied natural gas and 0.3 to 0.6 portion of additive, wherein the sum of the components is 100 portions by weight.
4. A process for producing a flame cutting gas from natural gas as claimed in claim 1, characterized in that: the method comprises the following steps:
step 1, adding ethyl acetate, pentene, n-pentane, cyclohexane and sorbitan oleate serving as raw material components of the additive into a container, mixing, and filtering to obtain the additive;
and 2, adding the additive into the liquefied natural gas according to the formula proportion, and uniformly mixing to obtain the liquid-phase flame cutting gas taking the natural gas as the raw material.
5. The method of claim 4, wherein: in the step 2, the additive is added into the liquefied natural gas according to the formula proportion, and the mixture is mixed for 40 minutes to obtain the flame cutting gas with the natural gas as the raw material in the liquid phase.
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| CN201911026207.5A CN110713856B (en) | 2019-10-25 | 2019-10-25 | Flame cutting gas using natural gas as raw material |
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| CN110713856B CN110713856B (en) | 2021-06-25 |
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Citations (11)
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| EP0524835A1 (en) * | 1991-07-26 | 1993-01-27 | Excellene Limited | Fortified hydrocarbon and process for making and using the same |
| CN1142844A (en) * | 1992-06-12 | 1997-02-12 | 艾塞灵有限公司 | Fortified hydrocarbon and process for making and using the same |
| CN1260382A (en) * | 1999-01-08 | 2000-07-19 | 上海金光工业气体有限公司 | High-energy light-weight mixed gas |
| CN101457167A (en) * | 2009-01-14 | 2009-06-17 | 邓学军 | Gas synergist |
| WO2011094943A1 (en) * | 2010-02-05 | 2011-08-11 | 秦皇岛远舟工业气体有限公司 | Natural gas additive used for cutting |
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| CN103320189A (en) * | 2012-03-23 | 2013-09-25 | 王发强 | Preparation method for novel energy-saving environmental protection professional metal welding-cutting gas |
| CN105176611A (en) * | 2015-10-28 | 2015-12-23 | 林州市绿能燃气设备材料有限公司 | Metal cutting gas and preparation method thereof |
| CA3023199A1 (en) * | 2016-05-24 | 2017-11-30 | Haldor Topsoe A/S | A process for the purifying of a raw gas stream containing mainly c1 -c5 hydrocarbons and carbon dioxide, and impurities of organic and inorganic sulfur compounds, halogenated and non-halogenated volatile organic compounds and oxygen |
| CN108067702A (en) * | 2017-12-13 | 2018-05-25 | 代纪东 | A kind of continuous casting steel billet Synergistic and energy-saving cutting method |
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2019
- 2019-10-25 CN CN201911026207.5A patent/CN110713856B/en active Active
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0524835A1 (en) * | 1991-07-26 | 1993-01-27 | Excellene Limited | Fortified hydrocarbon and process for making and using the same |
| CN1142844A (en) * | 1992-06-12 | 1997-02-12 | 艾塞灵有限公司 | Fortified hydrocarbon and process for making and using the same |
| CN1260382A (en) * | 1999-01-08 | 2000-07-19 | 上海金光工业气体有限公司 | High-energy light-weight mixed gas |
| CN101457167A (en) * | 2009-01-14 | 2009-06-17 | 邓学军 | Gas synergist |
| WO2011094943A1 (en) * | 2010-02-05 | 2011-08-11 | 秦皇岛远舟工业气体有限公司 | Natural gas additive used for cutting |
| CN102504897A (en) * | 2011-11-15 | 2012-06-20 | 沈阳创达技术交易市场有限公司 | Efficient and energy-saving liquefied petroleum gas additive |
| CN102585945A (en) * | 2012-03-06 | 2012-07-18 | 吕建业 | High-energy welding-cutting gas |
| CN103320189A (en) * | 2012-03-23 | 2013-09-25 | 王发强 | Preparation method for novel energy-saving environmental protection professional metal welding-cutting gas |
| CN105176611A (en) * | 2015-10-28 | 2015-12-23 | 林州市绿能燃气设备材料有限公司 | Metal cutting gas and preparation method thereof |
| CA3023199A1 (en) * | 2016-05-24 | 2017-11-30 | Haldor Topsoe A/S | A process for the purifying of a raw gas stream containing mainly c1 -c5 hydrocarbons and carbon dioxide, and impurities of organic and inorganic sulfur compounds, halogenated and non-halogenated volatile organic compounds and oxygen |
| CN108067702A (en) * | 2017-12-13 | 2018-05-25 | 代纪东 | A kind of continuous casting steel billet Synergistic and energy-saving cutting method |
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