CN102585944B - Industrial welding and cutting gas prepared by refining biogas - Google Patents

Abstract

The invention relates to refining industrial welding and cutting gas with biogas. It uses biogas as the main fuel, and adds a multifunctional catalyst to the biogas according to the volume ratio of 15:100000 to synthesize industrial welding and cutting gas; the multifunctional catalyst is mainly composed of the following components in volume fraction ratio : 20-25 parts of 200# solvent gasoline, 15-20 parts of methylcyclohexane, 10-15 parts of butyl acetate, 8-10 parts of ethylene glycol dimethyl ether, 6-12 parts of methyl ethyl ketone, 5-18 parts of butylcyclohexane, 5-15 parts of butyl acetate, 6-12 parts of p-tert-butylphenol and 4-6 parts of organoboride. The present invention adopts the multifunctional catalyst and the biogas to be used together, which improves the solubility and dispersion of various fuels, better dissolves and absorbs with methane gas, improves the quality of the fuel, and increases the flame temperature of methane burning in oxygen. Reach the combustion temperature of acetylene gas and realize the purpose of replacing acetylene gas.

Description

Biogas refined industrial welding and cutting gas

technical field

The invention belongs to the technical field of gas fuel, and in particular relates to industrial welding and cutting gas refined from biogas.

Background technique

With the development of the economy and the improvement of people's living consumption level, the amount of domestic waste generated in cities is increasing day by day. At present, there are no engineering measures for the harmless treatment of garbage in the city. Basically, all the garbage is simply piled up without harmless treatment, and its hygienic requirements are far from meeting the hygiene standards of environmental regulations.

These simple garbage dumps have caused a series of environmental pollution problems. It is manifested in: 1. Garbage is piled up in the open air, emitting bursts of stench, polluting the atmospheric environment, which can be smelled in several square kilometers around, seriously affecting the landscape. 2. There are no isolation measures for garbage, and the leachate produced by it pollutes groundwater and surrounding surface water, which greatly threatens the health of residents. 3. Pollution of the surrounding soil, causing the soil to lose its proper function.

The city's economy continues to grow, the population is increasing, and consumer goods are also increasing. If the garbage is not treated harmlessly, it will cause a major disaster. Municipal solid waste has a complex composition and a huge amount, and is one of the main sources of environmental pollution. The biogas produced by landfill degradation is a kind of greenhouse gas, and about 3%-4% of annual anthropogenic greenhouse gas emissions are from the methane in the biodegradation biogas.

The biogas produced by landfill degradation is one of the degradation products of sanitary landfills. Except for the main components CH ₄ and CO ₂ , more than 140 substances have been detected. The uncontrolled migration and accumulation of these biodegradable biogases will produce secondary pollution and cause combustion and explosion accidents; biodegradable biogases are another type of greenhouse gas, which has a destructive effect on the atmospheric ozone layer. The data show that the greenhouse effect produced by CH ₄ is larger than that of The equivalent volume of _CO2 is more than 20 times higher.

According to the data, each ton of garbage can produce about 100~200m ³ of biodegradable biogas during the life of the landfill, and its calorific value is generally 7450~22350KJ/m ³ , and the calorific value can be increased by 10% after dehydration, removing CO ₂ , After H ₂ S and other impurity components, the calorific value can be increased to 22360~26000KJ/m ³ (the calorific value of natural gas is 37260KJ/m ³ ), so it is a potential clean energy.

At present, the biogas produced by the degradation of urban waste landfills in my country is mainly used for power generation, civilian supply or direct combustion, and its added value is not high, and its operating profit is low. The payback period of the biogas generated by waste degradation is generally 3-5 years. If a multifunctional catalyst is added to the biogas to improve the combustion environment and thermal efficiency of the biogas, it can completely replace acetylene for metal flame welding and cutting. Its economic value It is far greater than power generation and supply for civilian use. At present, the landfill gas refined industrial welding and cutting gas is blank in the application field of landfill gas recovery in my country. Therefore, the development of landfill gas refined industrial welding and cutting gas is of pioneering significance in my country.

CDM projects can be applied for the recovery and utilization of methane gas produced by domestic waste through landfill. According to UNFCCC statistics, as of May 25, 2010, there were 2,213 CDM projects registered with the United Nations Executive Council (EB), of which 469 were waste treatment projects, accounting for about 17% of the total. There are a total of 23 recycling projects, 6 of which have successfully obtained the certified emission reduction (CER) issued by EB, with a total emission reduction of about 420,000 tons of carbon dioxide equivalent; landfills can generally operate continuously for 10 to 15 years . Continuous operation for 10 years can save 230,000 tons of standard coal; reduce SO ₂ emissions by 410 tons; at the same time, based on the amount of CO ₂ emission reductions that can be generated by conservative installed capacity, 4.2 million tons of CO ₂ can be reduced in 10 years of operation. According to the international transfer transaction of 9 euros per ton, the income of 37.8 million euros can be obtained. The resulting economic and social benefits are considerable.

To produce 1 ton of acetylene gas consumes 10,800 degrees of electricity, uses 4.5 tons of coke, uses 16 tons of water, and produces 3.5 tons of waste residue and 16 tons of waste water. At the same time, every 1m3 of acetylene gas is used, 1500mg of hydrogen sulfide (H ₂ S) and 1200mg of phosphine (PH3) are discharged. Compared with acetylene, the refined industrial welding and cutting gas of biogas can be compared with acetylene. Reduce the 10,800 kWh of electricity consumed in the production of acetylene, 4.5 tons of coke, 16 tons of water, 3.5 tons of waste residue and 16 tons of waste water. At the same time, it can reduce 1500g of hydrogen sulfide (H ₂ S) and 1200g of phosphine (PH3), and reduce the environmental pollution caused by CH ₄ gas which is 20 times the equivalent greenhouse gas produced by landfill gas. Therefore, biogas refining industrial welding and cutting gas has obvious advantages in economy, environmental protection and CDM projects.

Contents of the invention

The purpose of the present invention is to overcome the deficiencies in the prior art and provide a kind of biogas refining industrial welding and cutting gas.

According to the technical scheme provided by the present invention: biogas refining industrial welding and cutting gas, it is characterized in that it uses biogas as the main fuel, and multifunctional catalysts are added to biogas according to the volume ratio of 15:100000 to synthesize industrial gas Welding and cutting gas; the multifunctional catalyst is mainly composed of the following components by volume and fraction ratio: 20-25 parts of 200# solvent gasoline, 15-20 parts of methylcyclohexane, 10-15 parts of butyl acetate, ethylene glycol 8-10 parts of alcohol dimethyl ether, 6-12 parts of methyl ethyl ketone, 5-18 parts of n-butylcyclohexane, 5-15 parts of butyl acetate, 6-12 parts of p-tert-butylphenol and 4 organic borides -6 servings.

As a further improvement of the present invention, the organoboride is pentaborane.

As a further improvement of the present invention, the biogas is derived from combustible landfill gas produced by anaerobic decomposition of organic matter in factory sewage or landfill gas. The main components of landfill gas are methane and carbon dioxide, and its methane content is generally about 45-65%, carbon dioxide about 35-45%, trace components about 1%; landfill gas is collected and purified to produce biogas, the volume percentage of methane in biogas is not less than 95%, and the rest is carbon dioxide , water and other impurity gases.

Compared with the prior art, the present invention has the advantages of:

(1) The present invention uses a multifunctional catalyst in conjunction with biogas whose main component is methane gas, which improves the solubility and dispersion of various fuels, better dissolves and adsorbs with methane gas, improves the quality of fuel, and improves the The flame temperature of methane burning in oxygen, so as to reach the burning temperature of acetylene gas, realize the purpose of replacing acetylene gas.

(2) The production cost of the present invention is low, and one kilogram of biogas refined industrial welding and cutting gas can be used instead of the same amount of acetylene gas, which expands the application range of biogas and effectively increases the added value of biogas application.

(3) The invention is safe to use, and the industrial welding and cutting gas for refining biogas has a high ignition point, light gas, is not easy to temper during use, and is safe and reliable to use.

(4) The present invention is energy-saving and environment-friendly, the industrial welding and cutting gas of biogas refining is completely burned, the pollution to the environment is small, the fertilizer carbon dioxide is recovered, and the emission of carbon dioxide is reduced.

(5) The biogas refining industrial welding and cutting gas of the present invention belongs to the blank field at home and abroad, is innovative, and has obvious advantages in applying for CDM projects compared with other application methods.

Detailed ways

The present invention will be further described below in conjunction with specific examples.

Example 1

The first step: Synthesis of multifunctional catalyst: take 20L of 200# solvent gasoline, 15L of methylcyclohexane, 10L of butyl acetate, 10L of ethylene glycol dimethyl ether, 12L of methyl ethyl ketone, 8L of n-butylcyclohexane, Mix 15L of butyl acetate, 10L of p-tert-butylphenol and 5L of pentaborane to obtain a multifunctional catalyst.

Step 2: Add the synthesized multifunctional catalyst to the biogas at a volume ratio of 15:100,000 (that is, add 1.5L multifunctional catalyst to 100 cubic meters of biogas) to synthesize industrial welding and cutting gas.

Example 2

Step 1: Synthesis of multifunctional catalyst: Take 22L of 200# solvent gasoline, 18L of methylcyclohexane, 15L of butyl acetate, 8L of ethylene glycol dimethyl ether, 7L of methyl ethyl ketone, 10L of n-butylcyclohexane, Mix 5L of butyl acetate, 9L of p-tert-butylphenol and 6L of pentaborane to obtain a multifunctional catalyst.

Step 2: Add the synthesized multifunctional catalyst to the biogas at a volume ratio of 15:100,000 (that is, add 1.5L multifunctional catalyst to 100 cubic meters of biogas) to synthesize industrial welding and cutting gas.

Example 3

Step 1: Synthesis of multifunctional catalyst: Take 21L of 200# solvent gasoline, 16L of methylcyclohexane, 12L of butyl acetate, 9L of ethylene glycol dimethyl ether, 6L of methyl ethyl ketone, 15L of n-butylcyclohexane, Mix 10L of butyl acetate, 7L of p-tert-butylphenol and 4L of pentaborane to obtain a multifunctional catalyst.

Step 2: Add the synthesized multifunctional catalyst to the biogas at a volume ratio of 15:100,000 (that is, add 1.5L multifunctional catalyst to 100 cubic meters of biogas) to synthesize industrial welding and cutting gas.

Claims (1)

1. biogas highly industry cutting-welding gas, is characterized in that: it is to take biogas as main fuel, and polyfunctional catalyst is added in biogas according to the volume proportion of 15:100000, synthesizes industrial cutting-welding gas; Described polyfunctional catalyst mainly consists of the component of following volume parts ratio: 200# industrial naptha 20-25 part, methylcyclohexane 15-20 part, butylacetate 10-15 part, glycol dimethyl ether 8-10 part, methyl ethyl ketone 6-12 part, n-butyl cyclohexane 5-18 part, N-BUTYL ACETATE 5-15 part, p-tert-butylphenol 6-12 part and organic boride 4-6 part;

Described organic boride is pentaborane;

Described biogas derives from the flammable landfill gas that the organism in plant effuent or refuse embedded gas produces through anaerobic digestion, the major ingredient of landfill gas is methane and carbon dioxide, landfill gas makes biogas after collection, purifying treatment, methane volumn concentration in biogas is not less than 95%, and all the other are carbonic acid gas, water and other foreign gas.