Comprehensive utilization system for ring cooling machine waste gas and sintering large flue exhaust gas waste heat

Abstract

The invention discloses a comprehensive utilization system for ring cooling machine waste gas and sintering large flue exhaust gas waste heat. The system comprises a ring cooling machine front area waste heat recycling device, a low pressure steam drum and a high pressure steam drum. The ring cooling machine front area waste recycling device comprises a heat exchange device. The heat exchange device comprises a box body, and a high pressure superheater, a high pressure evaporator, a low pressure superheater, a high pressure coal economizer, a low pressure evaporator and a low pressure coal economizer which are sequentially arranged in the box body in the exhaust gas flowing direction. High-temperature exhaust gas waste heat in a sintering large flue and sintering ore cooled waste gas waste heat of a ring cooling machine are recycled, low-temperature waste gas waste heat of the III area of the ring cooling machine is utilized, the system is reasonably arranged in the heated face of the sintering large flue and the ring cooling machine waste heat recycling device according to the second law of thermodynamics, flue gas waste heat in the flue is recycled stepwise, two kinds of high-grade steam are produced, the power generation efficiency is improved, one steam drum is adopted for recycling waste heat in the sintering large flue and the ring cooling machine, the equipment number is reduced, and the investment cost is reduced.

Description

technical field [0001] The invention relates to a system for comprehensive utilization of sintering waste heat. Background technique [0002] The waste heat resources in the sintering production process mainly include two parts: the waste heat of high-temperature waste flue gas from sintering machine and the waste heat of sinter cooling waste gas on the ring cooler. In the total energy consumption of the sintering process, the waste heat of these two parts of waste gas is close to 50%. heat. At present, sintering waste heat recovery is mainly used for power generation to meet the electricity demand of iron and steel process or to generate electricity on the grid to reduce the operating cost of iron and steel plants. At present, most domestic iron and steel plants only recycle the 250-450°C medium-temperature waste gas from the first and second stages of the ring cooler for the sintering cooling waste gas on the ring cooler, and do not recycle the 100-150°C low-temperature w...

AI Technical Summary

Problems solved by technology

At present, most domestic iron and steel plants only recycle the 250-450°C medium-temperature waste gas from the first and second stages of the ring cooler for the sintering cooling waste gas on the ring cooler, and do not recycle the 100-150°C low-temperature waste gas from the third stage. Only a small number of iron and steel plants recover the waste heat of high-temperature flue gas sintered by sintering machines, and the waste heat recovery of sintering cooling on the ring cooler and the waste heat of high-temperature waste flue gas sintered by sintering machines are two independent recovery systems. There are many equipments and investment Big

Images