Waste heat boiler with reheating dry quenching function

Abstract

The invention relates to an ultra-high temperature and ultra-high pressure belt reheating dry quenching waste heat boiler system which comprises a boiler barrel, a deaerator, a steel structure, a water cooling wall hanging device, a hanging pipe, a high-temperature superheater, a high-temperature reheater, a water cooling wall, a low-temperature superheater, a low-temperature reheater, a finned tube evaporator, a high-pressure economizer, an outlet flue, an inlet flue, a filtering flue, an economizer wall plate and a platform escalator. A piping system; the ultra-high-temperature and ultra-high-pressure zone reheating generator set generates power by about 40% more than medium-temperature and medium-pressure power and generates power by about 15% more than high-temperature and high-pressure power. According to the invention, the main steam pressure is adjusted to 13.9 MPa, the main steam temperature is 571 DEG C, and the heat / reheat outlet temperature is 571 DEG C, which are ultrahigh temperature and ultrahigh pressure parameters. The high-temperature reheater and the low-temperature reheater are additionally arranged on the structure, in order to optimize flue gas heat exchange, a light tube evaporator is not arranged, and meanwhile the boiler has unique advantages in structural design.

Description

Technical field [0001] The invention relate to that field of power generation of waste heat pow stations, in particular to a dry quenching waste heat boiler with reheat. technical background [0002] The energy consumption per ton of steel in China's large steel enterprises is 10% higher than that in developed countries, and that in small and medium-sized enterprises is 20% higher than that in developed countries, which greatly affects the competitiveness and sustainable development of China's steel industry. Among them, more than 90% of coking coke in China is used in blast furnace ironmaking and metallurgical industries, so it is of great significance to improve the efficiency of waste heat utilization in coke quenching process to improve the competitiveness of enterprises, recycle energy, increase electricity and reduce pollution. Coke quenching processes are divided into dry quenching and wet quenching, and dry quenching is widely used because it is superior to wet quenching ...

AI Technical Summary

Problems solved by technology

[0004] The invention provides a CDQ waste heat boiler system with reheating, which is the first dual-superior waste heat boiler with reheating CDQ in China, aiming to solve the problem of low power generation efficiency of waste heat power plants in the The total power generation efficiency of the high-pressure belt reheating system is about 35%. This system generates about 40% more power than the medium-temperature and medium-pressure system, and about 15% more power than the high-temperature and high-pressure system.

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