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author： 2020-05-17
China is rich in natural gas and coal-to-gas (coal as raw material) resources.And belong to clean energy, gu has good social and economic benefits.The gas gas burner conforms to the industrial policy of our country, the market prospect is very good, has the development prospect greatly.However, in the development and design of gas burner, the characteristics of gas: inflammable, explosive and toxic, the primary problem of safety control.The following describes the safety control requirements of gas burner:
According to the combustion characteristics of gas in the furnace, the safety control requirements mainly include pre-blast, automatic ignition, combustion state monitoring, protection from ignition, protection from flameout, protection from high and low pressure of gas, insufficient air pressure protection, power failure protection, and measures to prevent gas leakage as an accident.
1. Pre-blast: before ignition, the burner must have a period of pre-blast to blow away or dilute the remaining air in the furnace and flue.Because the combustion machine working inside the chamber inevitably has the remaining gas, if does not carry on the pre-blast ignition, has the explosion danger.The residual gas must be blown away or diluted to ensure that the gas concentration is not within the explosion limit.
The preblow time is generally set to 15-60 seconds depending on the furnace structure and the blow time.
Two, self-ignition: gas combustion machine should be used electric spark ignition, easy to achieve automatic control.The high-voltage ignition transformer can be used to produce arc ignition, and its output energy is required to be: voltage ≥ 35kv, current > 15mA. The ignition time is generally 2~5 seconds.
Iii. Combustion state monitoring: the combustion state must be dynamically monitored. Once the flame detector senses the flameout signal, it must be fed back to the burner within a very short time.
If the flame detector can sense the flame normally, it should be neither sensitive nor insensitive.Because of its sensitivity, it is easy to produce false movement and slow if there is fluctuation in the combustion state, and the feedback flame signal lags, which is not conducive to safe operation.
Generally, the response time from flameout to flameout signal from the flame detector should not exceed 0.2 seconds.
Four, point not fire protection: combustion engine ignition, into the gas, gas combustion.The ignition action is required to take place before the gas enters, and the ignition temperature field is formed to facilitate ignition and combustion.If the flame detector cannot detect the fire, the burner will enter the protective state.
The time from ignition to protection should be appropriate, neither too short nor too long.If too short, too late to form a stable flame;Too long, when the ignition does not cause a large amount of gas into the furnace.In general, it is required that the burner judge the flame signal detected by the flame detector within 2-3 seconds after the gas is injected. If it is not on fire, it will enter the protection state, and if it is on fire, it will keep burning.
Ok, so that's the top part of the safety control requirements for gas burners/gas burners. We'll talk about that next time. Keep an eye on us.