Primary and secondary air heat distribution and adjusting system and method

Abstract

The invention discloses a primary and secondary air heat distribution and adjusting system. The primary and secondary air heat distribution and adjusting system comprises a water circulation system, aprimary air cooler, an air preheater and a secondary air heater. The water circulation system is connected between the primary air cooler and the secondary air heater. The air preheater comprises a primary air bin and a secondary air bin. An air outlet of the primary air bin is connected with an air inlet of the primary air cooler, and an air inlet of the secondary air bin is connected with an air outlet of the secondary air heater. The invention further provides an adjusting method. The primary and secondary air heat distribution and adjusting system and the adjusting method have the beneficial effects that redistribution of primary and secondary air heat is achieved, and the large exergy loss caused by the fact that the smoke exhaust temperature is decreased by heating condensation water is avoided; the heat exchange effect of the air preheater is improved, the smoke exhaust temperature is decreased, blockage of the air preheater can be relieved, and the safety of the air preheatercan be improved while operating economy of a boiler is improved; and the low-temperature corrosion phenomenon existing in heat exchange of air and smoke in a traditional method is relieved effectively.

Description

technical field [0001] The invention relates to a system and method for regulating wind temperature of power generation, in particular to a system and method for heat distribution and regulation of primary and secondary air. Background technique [0002] The primary air is used to transport and heat the pulverized coal, so that the pulverized coal is sent into the furnace through the primary air pipe, and at the same time, it is suitable for the ignition and combustion of the volatile components. The secondary air is high-temperature air, which is mixed with the primary air to mix the pulverized coal to provide the air required for pulverized coal combustion. [0003] The traditional air preheater rotates slowly during operation, the flue gas will enter the flue gas side of the air preheater and then be discharged, and the heat carried in the flue gas will be absorbed by the cooling fins in the air preheater, and then The air preheater rotates slowly, and the cooling fins m...

AI Technical Summary

Problems solved by technology

However, in the traditional technology, the reduction of exhaust gas temperature often means lower cold-end metal wall temperature, which is close to or even lower than the acid dew point temperature, resulting in serious air preheater blockage and low-temperature corrosion

[0005] Some power plants use heaters or air recirculation to increase the air inlet temperature in order to alleviate air preheater clogging and low-temperature corrosion, but such means reduce the heat exchange efficiency of the air preheater at the expense of economy ensure safety

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