Domestic natural gas and coal gas (coal) resources are rich, and belong to clean power, care has excellent social and economic benefits. Gas igniter in line with domestic industrial policy, shopping malls have a good prospect, poor development prospects. However, in the development and design of gas igniter, the characteristics of gas are flammable, explosive and toxic, and the emergency of safe operation is abnormal.
The safety control condition of the gas burner is first carried out under the following conditions: the ignition characteristic of the left-license gas in the hearth is first, the main body of the safe operating condition is provided with the pre-blowing, automatic ignition, the ignition form monitoring, the guarantee of the ignition, the safety of the flame-out, the guarantee of the concave-convex limit of the gas pressure, The atmosphere pressure is not as high as the guarantee, the power-off protection, the action to guard against the gas leakage, etc.
Before igniting, the igniter forces an hour of pre-blowing to blow or release the remaining air in the furnace and flue. Because of the inevitable excess gas in the igniter employment furnace, if the pre-blowing is not carried out and ignited, there is a danger of explosion. Force the remaining gas to be cleaned or released, guaranteeing that the gas concentration is not within the explosion limit.
The gas igniter should be ignited by electric spark, which is easy to kill and control automatically. Arc ignition can occur in high voltage ignition transformer, and the transmission energy is as follows: voltage ≥ 3. 5 kV, current ≥ 15mA, ignition time is usually 2 ≤ 5 seconds.
The ignition form is forced to be monitored dynamically. Once the flame detector senses the flameout flag and forces the igniter to react to the igniter in a very short time, the igniter immediately enters the guaranteed form and cuts off the gas supply at the same time.
The flame detector is to be able to sense the flame flag normally, not only to be sensitive, but also to be blunted. Because of the sensitivity, the ignition form can be blunted, the reaction flame flag is delayed, and it is not conducive to safe operation. The normal condition is no more than 0.2 seconds from the time when the flame detector is turned off to the flame detector to discharge the flame-out flag.
