Use of flue gas analyzers in improving combustion efficiency

    As awareness of environmental protection and energy conservation progresses, a number of large and medium-sized enterprises, such as steel metallurgy, petrochemicals and power plants, have made progress efficient, reduced energy consumption, reduced pollutant emissions, and environmental conservation important ways to improve the quality of production and enhance the competitiveness of products. The iron and steel industry is responsible for the energy consumption of the industries with regard to slinging machines, boilers, etc. in the electricity industry, and heating equipment. It is therefore a matter of great concern to measure and improve the efficiency of the extinguisher and to determine the optimal point of extinguishment.

    It is certain that the best dosage efficiency point for heating equipment such as heating stoves, boilers and so on is not all applied. For example, the effective heat is necessary to heat or condensate the material (and to suspend the process) in the case of a rolling steel heater or boiler. Based on the heat balance of the stove, in formula, Q - the heat to be supplied to the stove; Q1 - Physical heat taken from excess air in stove flue gas (e.g. exhaust gas); Q2 - The physical heat of the CO gas that is generated from or removed from the stove flue gas (discretion gas) because the fuel is not fully extinguished; Q3 - Thermal loss of stove equipment (including furnace heat, air escape, cooling water removal, heat radiation, etc.); Q4 - Other heat losses.

    As can be seen from the above pattern, the physical heat taken from the stove gas is the main part of the heat loss. Figure 1 shows the pattern of the heat efficiency and the heat loss as the emptiness of the flame increases or decreases compared to the alpha.

    While fuel can be fully extinguished when the amount of wind is too high (i.e., the air flame is larger than the alpha), the excess air in the flue gas is too high, as evidenced by the high O2 content in the flue gas, the higher Q1 value of the heat loss from the excess air and the low heat efficiency. At the same time, excess oxygen can resonate with the N2 in the fuel and in the flue gas to produce hazardous substances such as SO2 and NOX. In the case of rolling steel heating furnaces, excessive oxygen levels in the flue gas can also lead to a thickening of iron and steel oxides and increased burn damage.

    When the volume of the drum is low (i.e., the level of the empty flame is lower than the level of alpha), it is manifested in low O2 and high CO content in the flue gas, low losses in the discharge heat, but fuel is not out, heat loss Q2 is higher, and heat efficiency is reduced. In addition, the chimneys are black smoked to pollute the environment.