China has abundant natural gas and coal to gas resources, which belong to clean energy and have good social and economic benefits. Gas burners comply with China's industrial policies, have a promising market and great development prospects. However, in the development and design of gas combustion engines, gas characteristics - flammability, explosiveness, and toxicity - are the primary issues for safety control. Below is an introduction to the safety control requirements for gas burners: Based on the combustion characteristics of gas in the furnace, the safety control requirements mainly include pre blowing, automatic ignition, combustion status monitoring, protection against ignition failure, protection against extinguishing, protection against high and low gas pressure limits, protection against insufficient air pressure, power outage protection, and measures to prevent gas leakage accidents.

1. Before ignition, the pre blowing burner must have a period of pre blowing air to blow or dilute the residual gas in the furnace and flue. Because there is inevitably residual gas in the working furnace of the burner, there is a risk of explosion if ignition is not carried out without pre blowing. The residual gas must be blown clean or diluted to ensure that the gas concentration does not fall within the explosion limit. The pre blowing time is generally set at 15-60 seconds depending on the furnace structure and blowing volume.

2. Automatic ignition gas burners should use electric spark ignition to facilitate automatic control. A high-voltage ignition transformer can be used to generate arc ignition, and its output energy is required to be voltage ≥ 3 5K V, current ≥ 15mA, ignition time generally 2-5 seconds.

3. Combustion status monitoring: The combustion status must be dynamically monitored. Once the flame detector detects a shutdown signal, it must provide feedback to the combustion engine in a very short period of time. The combustion engine will immediately enter a protective state and cut off the gas supply. The flame detector should be able to sense flame signals normally, neither sensitive nor sluggish. Due to sensitivity, fluctuations in the combustion state can easily lead to misoperation and sluggishness, resulting in delayed feedback flame signals, which is not conducive to safe operation. The general requirement is that the response time from extinguishing to the flame detector emitting the extinguishing signal should not exceed 0.2 seconds.

4. Protection against ignition: When the combustion engine is ignited, gas is introduced and ignited. The ignition action requires the formation of an ignition temperature field before the gas is introduced, in order to facilitate ignition and combustion. If there is no ignition, the flame detector cannot sense the flame signal, and the combustion engine enters a protective state. The time from ignition to entering the protective state should be appropriate, neither too short nor too long. If it is too short, there is no time to form a stable flame; If it is too long and cannot be ignited, it will cause a large amount of gas to enter the furnace. It is generally required that within 2-3 seconds of introducing gas, the combustion engine judges the flame signal sensed by the flame detector. If it does not ignite, it enters a protective state, and if it catches fire, it maintains combustion.

5. Flame out protection: If the combustion engine accidentally stalls during the combustion process, it will enter a protective state. Due to the blazing heat of the furnace. Gas entering is prone to detonation, so it is necessary to enter a protective state in a very short period of time and cut off the gas supply. The response time for the process from stalling to entering the protection state of the combustion engine should not exceed 1 second. Japanese Zhengying Burner

6. Gas pressure high and low limit protection: The gas burner has a certain range of stable combustion, and only allows gas pressure to fluctuate within a certain range. The purpose of limiting the high and low pressure of gas is to ensure flame stability: not