Sintering Ring Refrigerator Exhaust Gas Waste Heat Recovery and Utilization System

Abstract

The invention discloses a waste heat recovery and utilization system of a sintering ring cooler exhaust gas, which includes a conventional flue gas circulation system; the flue gas circulation system includes a conventional waste heat recovery section of the ring cooler, a smoke collection hood, a high-temperature chimney and a waste heat boiler; a high-temperature chimney and a waste heat boiler The flue gas inlet is connected, and the flue gas outlet of the waste heat boiler is connected with the return air pipe of the conventional waste heat recovery section of the annular cooler; the flue gas-condensed water heat exchanger is installed on the exhaust pipe of the waste heat boiler; the supplementary combustion furnace is installed on the conventional air intake pipe , the air inlet of the supplementary combustion furnace is connected with the low-temperature air intake pipe, the low-temperature air intake pipe is connected with the low-temperature chimney, the low-temperature chimney is connected with the gas collection hood, and the gas collection hood is set on the low-temperature section of the ring cooler; the water inlet of the waste heat boiler is connected with the waste heat utilization unit The water outlet is connected, the steam outlet of the waste heat boiler is connected with the steam inlet of the waste heat utilization unit; the flue gas-condensed water heat exchanger is connected in parallel with the heater group of the thermal system of the generating unit. The invention can improve the comprehensive utilization rate of the waste heat recovery of the annular cooler.

Description

technical field [0001] The invention relates to a system for recovering and utilizing waste heat of exhaust gas of a sintering ring cooler. Background technique [0002] Among the various processes of iron and steel production, the sintering process is a major energy consumer, and its energy consumption is second only to the iron-making process. The sintering ring cooler is the post-processing equipment of the sintering process, which is used to cool the temperature of the sintered ore to below 150°C. The high-temperature exhaust gas of the annular cooler is a valuable waste heat resource. Taking the annular cooler equipped with a conventional 198m2 sintering machine as an example, the flow rate of the high-temperature exhaust gas (temperature about 350-450°C) in the annular cooler section is as high as 200,000 Nm3 / h, if you can make full use of the waste heat of the exhaust gas of the annular cooler, you will be able to reap very considerable economic benefits. [0003] ...

AI Technical Summary

Problems solved by technology

This scheme can produce considerable economic benefits, and because the exhaust gas realizes a closed cycle, which effectively avoids the environmental pollution caused by the emission of particulate matter in the exhaust gas, it has become the most mainstream waste heat recovery method of the annular cooler at present, but the scheme There are still major deficiencies: First, the exhaust gas temperature at the outlet of the waste heat boiler is still as high as about 150°C. The deterioration of the operating environment will lead to easy damage to the dynamic and static seals, accelerate the deformation of the frame of the annular cooler, and cracks in the joints of the annular cooler; secondly, because the cooling air volume of the annular cooler is very large, the exhaust gas at the outlet of the waste heat boiler at about 150 °C contains Huge sensible heat resource, the sensible heat resource still has great usable value. If it is directly returned to the ring cooler in the conventional way, although the flue gas temperature in the high temperature section of the ring cooler can be increased to increase the output of the waste heat boiler to a certain extent , but there is still a large energy waste

[0004] In addition, when the fume collecting hood on the ring cooler collects high-temperature gas, the collection process of high-temperature gas is an unstable process due to the operation of the trolley, and the instability of high-temperature gas leads to instability in the process of waste heat utilization The situation is not conducive to the utilization of waste heat

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