The working principle and application advantages of air heater
1. Through the continuous circulation of working fluid, the flue gas is cooled, and the air heating effect is good, without the consumption of steam. The power consumption of the circulating pump of the electric air heater is only 10kW, which is very small compared with the heat recovery power in the flue gas.
2. The air heater system is operating at low pressure, the medium is hot water, and the temperature is low.
3. Increase wall temperature, reduce flue gas corrosion, and prevent dust clogging. No need to set soot blower.
4. Compared with the air heater heat pipe type, only a circulating pump is installed. Although it consumes a certain amount of electric energy, it is easy to run, safe and reliable.
5. The air heater is convenient to set up and arrange, no need to modify the flue duct. Due to the thermal power requirements of the heat pipe of the electric air heater, it is generally required that the position of the air duct of the heater is higher than the flue duct. The forced circulation system of the electric air heater can be arranged according to the site conditions. The difference in pipe resistance caused by the matching of different positions can be solved by choosing a reasonable pressure head of the circulation pump of the electric air heater.
6. The power of the circulating pump of the air electric heater is 10kW, which is equivalent to 4kg/h of standard coal, and its heat is equivalent to the enthalpy of 30kg steam.
Application:
The power of the air heater is determined based on the calculation of air volume and temperature rise. On the premise that the air volume and temperature rise have met the needs, it is not advisable to use excessive air volume and excessive temperature rise. The excessive air volume and temperature rise directly lead to The power of the heater is too large, which increases energy consumption. Excessive air volume and temperature rise are not necessary. It is necessary to comprehensively consider, rationally design, and determine appropriate parameters. When using an air heater, only the pipe at the outlet of the electric heater is kept warm, and no heat preservation treatment is done on the surface of the heater itself. Comparative data shows that adding an insulation layer on the surface of the air heater can reduce energy consumption by 5% to 10%. Long-term operation can save energy. Install insulation layer.
