Natural gas combustion synergist, natural gas mixture containing same, and preparation method of natural gas mixture

Abstract

The invention provides a natural gas combustion synergist, comprising the following components in percentage by mass: 20 to 30% of solvent, 10 to 15% of combustion catalyst, 40 to 60% of combustion improver and 10 to 20% of polymerization inhibitor. The combustion synergist provided by the invention is mainly used for carrying out modification synergism to natural gas to improve the combustion speed and the combustion efficiency of the gas, improve the total effective energy, increase flame temperature and improve components of a combustion product, therefore, the natural gas can become a core product of high-energy industrial gas, and consequently, the technical effects of reducing the energy consumption, reducing the pollution, reducing production cost of a using department, improving the production efficiency and the like can be realized.

Description

technical field [0001] The invention belongs to the technical field of industrial gas synergists, in particular to the composition and application of natural gas combustion synergists for metal cutting and welding. Background technique [0002] Currently common industrial cutting gases mainly include: dissolved acetylene, propane and liquefied petroleum gas. Among them, dissolved acetylene is the most used, accounting for about 50%. The cutting gas in foreign developed countries is mainly mixed gas. Such as "Wilkert Gas" (70% Acetylene + 30% Propylene), "Hai Ah Sai M Gas" (85% Acetylene + 15% Propylene and Ethylene), "Hai Ah Sai C Gas" (80% Ethylene + acetylene 20%), "Spajet gas" (propylene 40-50% + butadiene 20-25% + propyne 25-30%). The above-mentioned industrial cutting gases all have certain defects, such as: dissolved acetylene has defects such as high production cost, high energy consumption, serious pollution, low safety factor, more slag hanging on the incision, a...

AI Technical Summary

Problems solved by technology

[0003] 1. Acetylene and propane are flammable, explosive and toxic gases with low safety factor, easy to deposit carbon, black smoke and dust when ignited, pollute the working environment, and are harmful to human health

[0004] 2. The explosion limit of natural gas is 5-15%, the explosion limit of acetylene gas is 2-80%, the ignition point of natural gas is 650 degrees Celsius, that of acetylene is 335 degrees Celsius, and that of propane is 450 degrees Celsius. It can be seen that the explosion limit range of acetylene and propane is large and the ignition point is low poor security

[0005] 3. The price of acetylene and propane is high, the use efficiency is low, and the waste of resources is large

[0006] 4. The unit volume of natural gas storage tanks is much larger than that of acetylene and propane (the gas-liquid ratio of natural gas is 625 / 1), and the volume of bottles and tanks filled with propane and acetylene is not easy to store and transport

However, the continuous use time of acetylene and propane is short, the tank needs to be changed frequently, the labor efficiency is low, and the cutting gap is large, which wastes raw materials

During the cutting process, the cutting surface is more likely to be deformed too much, the upper edge is burned and collapsed, and the lower edge is slag-hanging

[0007] 5. When cutting acetylene and propane, the warm-up time is long, the cutting speed is slow, the cutting surface is easy to hang slag, undercut, and it is difficult to clean

[0008] 6. There are hydrogen sulfide and phosphine in acetylene and propane. If the desulfurization and deacidification are not handled well, it may corrode steel and affect weldability, which will induce hydrogen cracks

[0009] 7. Acetylene is explosive, toxic, and has a low safety factor. Calcium carbide consumes a lot of energy and pollutes the environment. However, the market demand is large, so my country consumes about 1 million tons of calcium carbide every year.

However, when natural gas is used in industrial cutting or welding, it has disadvantages such as low combustion temperature, slow combustion speed, and low calorific value, which is not conducive to industrial production.

In order to make natural gas overcome the above-mentioned shortcomings so that it can be used in industrial cutting and welding processes, it is generally necessary to add a combustion synergist to the gas at present, but after the existing combustion synergist is added, the total calorific value of combustion is still not high , The combustion temperature is not high enough to replace acetylene, the combustion speed is slow, the combustion efficiency is low, the flame is not concentrated, the gas supply is not smooth and continuous, and the flame is large and sometimes small.

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