The safety of gas production characteristics

Gas as fuel gas, with transportation convenience, simple operation, homogeneous combustion, temperature, dosage is easy to control and other advantages, industrial production is the major energy source. In the metallurgical enterprise, blast furnace, coke oven gas, converter steelmaking by-product, it is metallurgy furnace heating body hot material.

The safety of gas production technology

The gas contains large amounts of carbon monoxide, circulate in the workplace, easy to make the personnel poisoning.

( 1) gas properties. Gas is the main component of carbon monoxide, hydrogen, methane and other combustible gases, including carbon monoxide toxic. The gas also contains a small amount of combustible gas, such as nitrogen, carbon dioxide. Therefore, the gas accidents are divided into three categories: poisoning, fire and explosion.

( 2) the gas poisoning causes and Countermeasures

Gas poisoning:

Gas leakage. Presence of gas leakage parts of a blast furnace tuyere of blast furnace, gas valve, gas valve of blast furnace cooling frame, drive shaft, gas pipeline flange parts, gas blower belt etc., workers in these areas work most prone to gas poisoning accident.

Safety countermeasures:

Gas facilities must be designed in line with national standards and specifications; making gas equipment repair system, timely inspection, found timely processing of gas leakage; graded management. According to the content of carbon monoxide, the operating region is divided into one or two, three types of gas hazard area. A kind of gas in hazardous areas, personnel must wear oxygen ventilator or ventilation mask, and should be someone in custody at the scene; two kinds of gas hazardous areas, should be ready for the oxygen breathing apparatus or someone care; in three types of gas hazardous areas, although without the use of oxygen breathing apparatus but also should strengthen detection.

( 3) the causes of the gas explosion and preventive measures. Explosion of gas gas and air mixing a certain proportion, in case of fire, the electric spark ignition temperature, more than can be produced. Gas explosion must have three conditions, one is the gas concentration in the explosion limit range; two is a confined space; three is the presence of an ignition source. Only these 3 conditions have at the same time, the gas can explode.

The cause of the accident:

Industrial furnace internal temperature has not yet reached the ignition temperature is input to the furnace gas, the formation of explosive mixture gas, the ignition explosion accident; forced draught kiln open fan, gas from the valve from entering into the wind pipe, ignition, explosion; industrial furnace delivery gas ignition, gas operator error plug opening for closing the gas into furnace, industrial furnace explosion, ignition; the first ignition, gas feeding is not lit, untreated residual gas on the second ignition, explosion; industrial furnace blower sudden blackouts, gas can not be completely burning gas burner, part from fleeing into the air conduit, explosion; gas equipment production, the gas processing clean, without explosion, fire explosion; gas furnace blower sudden blackouts, gas flows into the air pipe down, explosion; ready for production of gas pipeline, gas pipeline and has no blind board partition, gas the valve leakage into the new pipeline, without air analysis of inspection, fire explosion; gas equipment production maintenance, equipment in the gas has been removed, inspection and Lattice, allowing the fire, after the steam pipe and the gas device is disconnected, the other a normal production of gas equipment gas along a steam conduit and valve fleeing into the maintenance of the equipment, the second fire without laboratory examination, explosion; gas equipment in case of fire, an all-steam or nitrogen gas charge pressure, not cut off the gas source, backfire explosion.

Safety countermeasures:

The staff in the extensive foreseen danger activity, where direct contact, operation, maintenance of gas equipment and workers, should be familiar with the structure and performance of gas equipment, gas risk awareness, control of gas equipment safety standardization operation essentials, and upon passing the examination, obtain the certificate, before posting operation.

Gas equipment maintenance shutdown, gas processing must be clean, and the normal production of gas equipment with blind or valve and seal off, turn the gas device on a steam pipe, the pipe is disconnected.

In gas equipment hot furnace ignition gas feeding before, must first be gas analysis. General production maintenance of gas equipment in the air in the oxygen content should be in 20.5% above, furnace ignition gas feeding, the oxygen content in coal gas should not be greater than 1%.

( 4) the gas fire. Gas combustion must have two conditions : one is to have enough air, there are two open fires or reach the gas ignition.

The cause of the accident:

In the basement of coke furnace or in open hearth furnace with gas under a layer of blind plate, a large amount of gas emission, contact with fire, the fire accident; with gas operations using iron tools, impact sparks, fire accidents; with gas when operating, near a fire or naked steam pipe, fire accident caused by gas pipeline; pipeline maintenance shutdown, such as naphthalene stored or iron sulfide spontaneous combustion; gas equipment fire when the gas leakage fire; gas equipment maintenance shutdown, the gas is not clean, and is not ready to fire facilities and fire, fire accident; lightning or coke oven gas diffusion opening up vulcanization the iron, causing a fire accident.

Safety countermeasures:

With gas when operating, less than 40 m banned all fire, do not take special safety measures, is strictly prohibited in the basement of coke furnace with gas operation.

With gas operation should use copper or aluminum bronze alloy tool, prohibition of the use of iron tools.

In the bare high temperature steam pipeline equipment should be near, adiabatic process.

In gas equipment shall be equipped with a fire, fire fire facilities. Stop gas fire equipment must be cleaned.

Gas production safety prevention measures and technology

1) explosion accident rescue

Gas equipment or furnace once a gas explosion, not only damage to the device, but also caused casualties or poisoning. After the explosion, should first save, cut simultaneously has gas explosion equipment gas source, , prevent the two explosion. Gas equipment is not damaged, should identify the cause of the explosion to send gas.

2) the fire accident rescue

Gas fires often raging fire, gas pipeline fire is often black smoke. According to the gas fire, should local stop using gas, managed to close the gate to reduce gas pressure, and to fire equipment through a large number of steam or nitrogen. Gas pipeline diameter below 150mm, can be directly closed valve flameout. In case of explosion, the maximum explosion pressure of about 0.7 MPa ( 7kg / cm2 ), small diameter pipe gas explosion pressure enough to bear. Diameter above 150mm, close the valve to reduce gas pressure minimum of not less than 49 ~ 98 h, forbidden suddenly completely closed valve or water seal, to prevent backfire explosion. Gas fire rescue work should pay special attention to the following points:

( 1) gas equipment burned red, not sudden cooling water, to prevent gas leakage gas equipment deformation, more.

( 2) the gas valve, pressure gauge, the steam or nitrogen pipe head, well control operation.

( 3) the vapor sources have difficulty, can call the steam engine or steam crane.

( 4) such as a gas pipeline sediment ignition, sealed manhole isolation from the air so that the extinguishing.