Steel works sintering cooling machine low-temperature flue gas residual heat utilization system

Abstract

The invention discloses a system for utilizing the low temperature fume waste heat of a sintering cooling machine in steel works. The system comprises a sintering forced draft cooling machine, a waste heat boiler and a blower. The sintering forced draft-cooling machine is communicated with the waste heat boiler through a flue, and pumps fume to the waste heat boiler through the blower. The waste heat boiler comprises a moderate temperature waste heat boiler and a low temperature waste heat boiler which are arranged independently. Therefore, after high temperature fume of the hot section of the sintering forced draft cooling machine is directly taken into the moderate temperature waste heat boiler for heat exchange and pumped by a recirculating blower, and fume is conveyed back to a bellows arranged on the lower part of the sintering forced draft cooling machine; after the lower temperature fume at the moderate temperature section of the sintering forced draft cooling machine is taken into the low temperature waste heat boiler for heat exchange and is pumped by an induced draft fan, fume is discharged into the environment. As the independent fume complete circulation moderate temperature waste heat boiler system is provided, the working parameters of the waste heat boiler can be improved; the generated output, the pressure and temperature of the waste heat boiler can be stabilized; in addition, the heat of the low temperature fume at the moderate temperature section of the sintering forced draft cooling machine is effectively reclaimed.

Description

technical field [0001] The invention relates to a flue gas waste heat recovery system, and more particularly to a low-temperature flue gas waste heat utilization system of a sintering blast cooler in a steel plant. Background technique [0002] In the process of sinter production in iron and steel plants, especially the cooling process of sinter by sinter blast cooler, a large amount of low-temperature flue gas with a temperature of 150-400°C will be discharged, thereby wasting a large amount of recyclable energy. The traditional waste heat utilization system is to install a simple waste heat boiler in the high temperature section of the sintering blast cooler to produce low-pressure steam for sintering production process, heating and domestic use. The efficiency of the waste heat utilization system is low, resulting in the ineffective and stable recycling of waste heat resources. Although the waste heat utilization system has been significantly improved in recent years, th...

AI Technical Summary

Problems solved by technology

But the flue gas in the high temperature section is not sent back to the sintering blast cooler, so the temperature of the flue gas in the high temperature section is unstable and does not increase. When the operation of the sintering blast cooler fluctuates, it is difficult to maintain stability and improve the operating parameters of the waste heat boiler , will lead to poor heat transfer effect, and it is difficult to reach the design value

[0013] To sum up, the existing low-temperature flue gas waste heat utilization systems of various sintering blast coolers are generally unstable in operation, the actual operating value cannot reach the design value, and the sintering blast cooler splashes materials, which is difficult to guarantee Does not affect the original production process and other shortcomings

Images