Comprehensive Utilization System of Exhaust Gas Waste Heat of Ring Cooler

Abstract

The invention discloses a system for comprehensive utilization of exhaust gas and waste heat of an annular cooler, which includes a flue gas circulation system; the flue gas circulation system includes a smoke collection hood, a high-temperature chimney and a waste heat boiler; The air duct is connected; the flue of the waste heat boiler is equipped with a high-pressure section superheater, a high-pressure section evaporator, a low-pressure section superheater, a high-pressure section economizer, a low-pressure section evaporator, a low-pressure section economizer, and a condensate heater. A high-pressure section drum and a low-pressure section drum are arranged outside the flue; the water inlet of the low-pressure section economizer is connected with the water outlet of the waste heat utilization unit, and the steam outlet of the low-pressure section superheater and the high-pressure section superheater steam outlet are connected with the waste heat utilization unit steam inlet. The water inlet of the condensate heater is connected with the water inlet of the low-pressure heater of the thermal system of the generator set, and the water outlet of the condensate heater is connected with the water outlet of the low-pressure heater of the thermal system. The invention can improve the comprehensive utilization efficiency of the waste heat of the annular cooler.

Description

technical field [0001] The invention relates to the technical field of energy saving in the iron and steel industry, in particular to a comprehensive utilization system for exhaust gas and waste heat of an annular 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 annula...

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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 for annular coolers 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, and the higher return air temperature will have an adverse effect on the operation of the ring cooler: the higher cooling air temperature of the ring cooler will lead to the failure of the ring cooler. 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

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