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as the name implies, gas boilers use gaseous fuels for combustion. the equipment is relatively simple and easy to operate. however, if an anoxic phenomenon occurs during combustion, carbon black may be thermally decomposed, resulting in incomplete combustion heat loss, and also explosive when mixed with a certain amount of air, and there must be reliable safety measures in operation and management.
in order to improve and strengthen the combustion of gas-fired boilers, in order to increase the volumetric heat load of gas-fired boilers and reduce the heat loss of incomplete combustion, the following technical measures can be taken:
1. improve the conditions for meeting the air flow:
improve the gas boiler gas and air flow conditions, the purpose is to increase their contact area. the larger the contact area, the larger the reaction area and the stronger combustion. specifically, gas and air can be divided into multiple trickles so that the two streams have a certain speed and meet each other; one gas flow (usually gas) passes through and is submerged in the other, and so on.
2. strengthen mixing and disturbance:
gas-fired boilers use single-phase reactions for the combustion of gaseous fuels. ignition and combustion are easier than solid fuels, but their combustion rate and combustion integrity are closely related to the mixing of gas and air. the better the mixing, the quicker and complete the burning and the shorter the flame. therefore, as long as the stability of the flame is not destroyed, the airflow velocity in the air outlet or the combustion chamber should be increased as much as possible, and even obstacles with large resistance such as baffles should be provided at the entrance to allow them to hit and rush and increase the disturbance of air flow. to strengthen the mix.
3. preheat gas and air:
raising the temperature of gas and air can intensify the combustion reaction. therefore, the waste heat of the exhaust should be used to preheat the gas and air temperature, thereby increasing the combustion temperature and the flame propagation speed, so that the combustion process can be strengthened.
4. rotating and circulating air flow:
rotating the airflow can enhance disturbance and mixing. at the same time, a recirculation zone will be formed in the center of the swirling airflow to guide the backflow and circulation of large quantities of flue gas, which will not only enhance the mixing, but also extend the flow path and residence time of the flue gas in the gas boiler and reduce the incomplete combustion loss.
5. flue gas recycling:
in order to increase the temperature of the combustion reaction zone of the gas boiler, a portion of the high-temperature flue gas may be directed to the combustion data to be mixed with the flammable or burning combustible mixture to increase the combustion intensity. however, it should be noted that the amount of recirculated flue gas should not be too large, otherwise the combustible mixing hook will be diluted due to too much inert material, which will slow down the combustion rate and even cause anoxic pyrolysis, resulting in incomplete combustion loss of the gas boiler.
