The difference between natural gas stoves and gas stoves
1. First, understand the difference between natural gas and gas.
Natural gas is generally dry gas, the composition is mainly methane, basically contains no impurities, high calorific value, slow flame propagation speed and high conveying pressure.
Gas is a mixture of various gases, containing water, oil and dust, ammonia, hydrogen sulfide and other impurities, and the delivery pressure is low.
Natural gas has been widely used as an efficient, clean and high quality fuel. The calorific value of natural gas is about 2.3 times that of artificial gas . Its main component is methane, the content is as high as 90% or more, and the rest is ethane. Natural gas, like artificial gas, is flammable and explosive. It must be oxygen-supported during combustion. At the same time, it will produce a large amount of carbon dioxide gas. If it stays in a confined space where gas is used for a long time, it will cause people to suffocate and die. When the gas content in the air exceeds 5% , a flash explosion may occur in the event of an open flame.
Usually, the pressure of the gas is large, the gas nozzle has a small pore size, and the natural gas pressure is small and the pore diameter is large, so they cannot be mixed. In addition, when designing the cooker, it is usually concerned with the amount of oxygen (20.9%) in the air, that is, the mixing ratio. The liquefied petroleum gas requires more air, and the other two are less.
　　 2 , the working principle and shape of natural gas stoves and gas stoves are similar, the difference is that the pores of the gas nozzle are different, we all know that the main reason is that the combustion heat value of natural gas and gas is different, and their pressure is different. Everyone has to choose according to the needs of their own home.
The pressure of natural gas is 2,800 Pa and the pressure of pipeline gas is 2,000 Pa. The pipeline gas stove can be changed to a natural gas stove. This process requires changing the nozzle and the fire cover of the cooker. Everything else is solved by the gas company. The difference between a gas stove and a gas stove is not dangerous once it has been changed, but it is very dangerous if you use a gas stove that has not been changed to burn natural gas.
　　 3. From the characteristics of combustion , natural gas and gas are not interchangeable. Therefore, when the gas is converted to natural gas, the original gas cooker, appliance, meter, and distribution pipe network must be replaced or modified. The artificial gas burning appliances should be modified or renewed into natural gas burning appliances, and the household cooking appliances are converted into natural gas cooking appliances by replacing nozzles and fire hole covers. The domestic water heater is converted into a natural gas water heater by replacing the nozzle ( main fire, long open flame, etc. ) burner.
When the artificial gas is changed to natural gas, the household cooker can be changed into a natural gas cooker by replacing the nozzle and the fire hole cover. The difference between natural gas stoves and gas stoves The domestic water heater is changed into a natural gas water heater by replacing the nozzle ( main fire, long open flame, etc. ) and the burner.
The difference: the nozzle has a larger outlet and a smaller outlet.
The signs of natural gas stoves produced by regular manufacturers are marked with “T†; the liquefied gas stoves are indicated by “Y†, and the artificial gas stoves are indicated by “R†.
It can also be seen from the gas outlet of the stove that the liquefied gas has the highest calorific value ( 12,000 kcal / m3), so its outlet is the finest, about 0.5~1 mm, and the natural gas calorific value is centered ( 8000 kcal / m3). Its outlet is 2 mm; the artificial gas has the lowest calorific value (GB: not less than 3,400 kcal / cubic meter), so its outlet is about 2.5 to 3 mm.
The main component of natural gas is methane. It requires less natural gas for combustion and requires more air. Therefore, its gas outlet is smaller and the air inlet is larger. The main components of liquefied gas are hydrocarbons and alkenes with more carbon, and methane when burning. On the contrary, it has a large outlet.
The calorific value of natural gas is different from that of liquefied gas. Specifically, the nozzles, dampers and panel heat loads of natural gas cookers are different from those of liquefied gas cookers. The use of natural gas in liquefied gas cookers generally results in little fire.
The difference between the liquefier and the natural gas is that the pressure is different for the cooker, the pressure of the liquefied gas is high, and the pressure of the natural gas is low, which is reflected in the stove, that is, the diameter of the nozzle on the liquefier stove is smaller than the diameter of the nozzle of the natural gas stove, so the two furnaces It can't be used directly, but it's OK to change one nozzle, and the other parts are universal. If the liquefier stove wants to use natural gas, just expand the nozzle a little.
First, the flame separation phenomenon of gas cookers
Technical requirements for gas cookers: ( 1 ) Burner head and cooker panel should be parallel ( 2 ) Combustion gas pipe nozzle should be concentric ( 3 ) Tee and nozzle should be perpendicular to each other ( 4 ) After assembly, the pressure must be tested. 280 - 300 mm Hg, no fire, no tempering, no yellow flame.
Second, the tempering phenomenon of gas cookers
The flame retracts into the fire hole and burns in the burning chamber, causing noise, and the result is burning the burning appliance or other equipment. It often causes the flame to go out. In order to cause poisoning and explosion accidents.
Third, the flame separation phenomenon of gas cookers
The phenomenon that the flame has just left the fire hole, if the flame is completely out of the fire hole, it is called fire. Similarly, the flame and the fire will cause the flame to go out and cause an accident.
Fourth, the fire phenomenon of gas cookers
When the airflow velocity at the exit of the fire hole increases to a certain value, the airflow velocity component in the normal direction of the fire surface is greater than the burning speed. At this time, the flame rises remarkably, and the root volume draws in excess secondary air to make the concentration Dilution, the temperature is lowered, the flame is emitted, and as the outlet airflow continues to increase, a fire will occur.
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