Efficient energy-saving anti-freezing air heater system and method

Abstract

The invention discloses an efficient energy-saving anti-freezing air heater system and a method. The system comprises a heat pipe air heater, wherein the heat pipe air heater communicates with a fan, of a boiler, and a condenser of a steam turbine, and the steam turbine is further provided with a low-pressure cylinder; and an outlet of the fan communicates with a cold air duct, the heat pipe air heater is divided into two portions of a water section and a steam section, a liquid working medium k is contained in the water section, the water section is arranged below the cold air duct, and the steam section is arranged in the cold air duct. According to the efficient energy-saving anti-freezing air heater system and the method, high-temperature cold water at an outlet of the condenser of the steam turbine is used for heating cold air at the outlet of the fan of the boiler, heat of the high-temperature cooling water (high-temperature cold water) belongs to complete waste heat, and is lost in the coal-fired power plant boiler, and the economical efficiency of a whole plant can be greatly improved by using the part of heat, so that the efficient energy-saving anti-freezing air heater system and the method have a huge energy-saving effect; and meanwhile, the heat pipe air heater is used, and a substance with a low freezing point is adopted as a heat transfer medium, so that the risk of frost cracking of the air heater under cold working conditions such as winter is avoided, and the safety and the stability of equipment are greatly improved.

Description

technical field [0001] The invention relates to an air heater system and method, in particular to an air heater system and method with high efficiency, energy saving and antifreeze. Background technique [0002] Nowadays, the control of pollutants from power plant boilers and industrial boilers is becoming more and more stringent, and basically all large coal-fired power plant boilers have undergone SCR transformation. Although SCR transformation can reduce NOx emissions, it is also easy to cause the problem of ammonium bisulfate blockage in the air preheater. In order to solve this problem, it is necessary to control the comprehensive problem of the cold end of the air preheater, so that the inlet cold air temperature and exhaust gas temperature of the air preheater are above a certain value. Among these two temperatures, the cold air temperature at the inlet of the air preheater is relatively easier to increase. [0003] In order to increase the temperature of the cold a...

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Problems solved by technology

[0004] Although the above-mentioned air heaters can meet the requirements of increasing the wind temperature, they all face the same problem: when the ambient temperature is relatively low in winter, the air heater is prone to the risk of freezing cracks, especially in northern my country

Even if a steam heater is used, when the ambient temperature is very low, the above problems are also prone to occur when the unit is started

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