Environment-protection energy-saving gas for welding and cutting

An environmental protection, energy saving, welding and cutting technology, applied in the field of gas for welding and cutting, can solve the problems of long cutting preheating time, corrosion of steel cylinders, inability to weld carbon steel, etc. effect of temperature

Inactive Publication Date: 2008-03-12
周尧
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main problem is: the flame temperature of propane is lower than that of acetylene, which can only reach 2600 °C, and it cannot be welded to carbon steel, and the cutting preheating time is long
In the 1990s, some people added additives based on inorganic materials to propane to increase the flame temperature to 2800-2950 ° C, but failed to solve the problem of fusion welding of carbon steel; and the geographical distribution of gas sources is limited
There are several domestic companies that add additives to LPG, but because the temperature has no obvious advantage compared with the temperature of acetylene, none of them can rea

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  • Environment-protection energy-saving gas for welding and cutting
  • Environment-protection energy-saving gas for welding and cutting

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Embodiment Construction

[0035] Below in conjunction with embodiment, the present invention is described in detail. The present invention uses propane as an alternative acetylene cutting gas.

[0036] The safety of propane compared to acetylene is obvious. The explosion limit of acetylene in air is 2.55-80%, while that of propane is only 2.1-9.5%. The burning speed of acetylene is 7.5 m / s, while that of propane is only 0.51 m / s, so it will not burn back (backfire). Industrial acetylene (carbide gas) produces harmful gases such as sulfide and phosphide when burned, while propane has high purity and only produces carbon dioxide and water when burned.

[0037] Compared with liquefied petroleum gas (the main components are propane, isobutane, n-butane), the characteristics are as follows: (see Table 1)

[0038] Table 1

[0039] propane

liquefied petroleum gas

Purity (industrial product)

97～99％

propane, isobutane, n-butane

alkane mixture

Relative density ...

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PUM

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Abstract

The invention relates to a fuel gas for welding cut that is environmental friendly and energy saving, in particular to a fuel gas that can substitute acetylene gas. The fuel gas comprises a propane gas, which is characterized in that synergist is added in certain proportion in the propane gas; the content of the propane gas is 97-99%; the content of the synergist is 5 per mill-1%, the content of the liquefiable foreign matter of gas is less than 2.5% by weight; the synergist is a mixed solution comprising combustion catalyst, smoke-removing agent, polymer degrading agent, solvent, solution assistant, and combustion assistant, etc.; the fuel gas is used as combustion gas in place of acetylene gas to weld and cut metals. The flame of the fuel gas is of high temperature, is free from reverse (return) combustion; the fuel gas is of very low explosion limit and low toxicity, free from harm to human bodies, of low comprehensive cost, high efficiency, is safe, environmental friendly and energy saving.

Description

technical field [0001] The invention relates to an environment-friendly and energy-saving welding and cutting gas, in particular to a gas that can replace acetylene gas in the process of metal welding and cutting. Background technique [0002] In the machinery manufacturing industry, the technology of welding and cutting metals with oxy-acetylene flames has a long history; this oxy-acetylene welding and cutting technology has some shortcomings, which people have long wanted to solve ;, such as: use acetylene as gas, which is flammable, explosive, and pollutes the environment, and has high cost and high energy consumption. At the same time, acetylene gas contains toxic gases such as phosphine and arsine, which will bring harm to people. harm. With the development of productivity and social progress, people pay more and more attention to environmental protection, energy saving, safety, and efficiency. Acetylene gas has exposed various disadvantages: high energy consumption, l...

Claims

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Application Information

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IPC IPC(8): C10L3/00
Inventor 周尧
Owner 周尧
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