Comprehensive optimized smoke discharge waste heat deep recycle system of smoke in thermal power plant

Abstract

The invention relates to a comprehensive optimized smoke discharge waste heat deep recycle system of smoke in a thermal power plant. The system comprises a smoke cooler is arranged at the back of a dust remover and in front of a desulfurizing tower in a smoke channel. A preferable scheme further comprises a smoke discharge waste heat utilizing device used for enabling absorbed heat to heat condensation water or enabling a steam air heater to heat air to improve air supply temperature. Compared with the prior art, the system greatly reduces smoke discharge temperature, simultaneously completely utilizes recycled heat and improves unit efficiency.

Description

technical field [0001] The invention relates to a thermal power plant boiler system, in particular to a thermal power plant flue gas comprehensive optimization smoke exhaust waste heat deep recovery system. Background technique [0002] Thermal power plants consume 50% of my country's total coal output, and its exhaust heat loss is the largest among all heat losses of power plant boilers, generally 5% to 8%, accounting for 80% or more of the total heat loss of boilers. The main influencing factor of exhaust heat loss is boiler exhaust temperature. Generally, for every 10°C increase in exhaust temperature, exhaust heat loss increases by 0.6% to 1.0%, and coal consumption for power generation increases by about 2g / kWh. In my country's active thermal power units, the exhaust gas temperature of boilers is generally maintained at around 125-150 °C, and that of lignite boilers is around 170 °C. High exhaust gas temperature is a common phenomenon, resulting in huge energy losses. ...

AI Technical Summary

Problems solved by technology

The main influencing factor of exhaust heat loss is boiler exhaust temperature. Generally, for every 10°C increase in exhaust temperature, exhaust heat loss increases by 0.6% to 1.0%, and coal consumption for power generation increases by about 2g / kWh

In my country's active thermal power units, the exhaust gas temperature of boilers is generally maintained at about 125-150 °C, and that of lignite boilers is about 170 °C. High exhaust gas temperature is a common phenomenon, which causes huge energy losses

[0003] For the boilers that have been put into operation, the range of reducing the exhaust gas temperature through combustion optimization is very limited. The transformation of the economizer and air preheater is limited by the space, and the range of reducing the exhaust gas temperature is also very small. At the same time, the rear heating surface The low temperature corrosion also limits the substantial reduction of the exhaust gas temperature

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