System for increasing the temperature of secondary air at inlet of air pre-heater

Abstract

The invention relates to a smoke discharge technology for a boiler, and in particular to a system for increasing the temperature of secondary air at an inlet of an air pre-heater. The system is characterized in that a mixer is arranged in the middle of a secondary air inlet pipeline of the air pre-heater; a hot air circulating pipeline is connected and arranged at an outlet of a primary air outlet pipeline of the air pre-heater; and the hot air circulating pipeline is communicated with the mixer to guide primary air to the mixer to regulate hot air. With the structure, the resistance loss of the system is low, the temperature of the secondary air at the inlet of the air pre-heater can be effectively increased, and low-temperature corrosion can be reduced; the goal of effectively reducing the design smoke discharge temperature of the boiler at the design phase of a power plant can be achieved; and through the arrangement of a smoke baffle, air temperature can be regulated according to the practical situation of the power plant, and the operation is convenient and simple.

Description

technical field [0001] The invention relates to boiler smoke exhaust technology, in particular to a system for increasing the temperature of secondary air at the inlet of an air preheater. Background technique [0002] Boiler exhaust gas temperature is the most important factor affecting boiler efficiency. The current boiler exhaust gas loss accounts for more than 4%, so the reduction of exhaust gas temperature is of great significance to the improvement of boiler efficiency. However, if the exhaust gas temperature is too low, it is easy to cause low-temperature corrosion of the air preheater. In terms of the causes of low-temperature corrosion, on the one hand, it is the sulfur content in coal, which cannot be changed for boilers with fixed coal types; on the other hand, it is the inlet air temperature of the air preheater and the exhaust gas temperature of the boiler. Therefore, to reduce the exhaust gas temperature of the boiler to a certain extent to improve the efficie...

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Problems solved by technology

[0009] In order to solve the problem of increasing the temperature of the secondary air at the inlet of the air preheater of the existing power plant boiler, the present invention provides a system for increasing the temperature of the secondary air at the inlet of the air preheater. The air temperature at the secondary air inlet can also inhibit the occurrence of low temperature corrosion

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