Comprehensive utilization apparatus for flue gas exhaust heat

Abstract

The invention provides a comprehensive utilization device for smoke gas exhaust heat, comprising a steam dome, a flue-type furnace and a flue-type exhaust heat boiler which is arranged in the flue-type furnace and formed by a heating surface of vapouring water and a heating surface of heating water; at least two smoke gas take-away devices are additionally arranged in the furnace, one is arranged between the heating surface of vapouring water and the heating surface of heating water to form a low-temperature smoke gas take-away device and the other is inserted in the middle of the heating surface of vapouring water to form a high-temperature smoke gas take-away device; the delivery outlets of the two smoke gas take-away devices are combined to a smoke gas delivery outlet by a smoke gas adjusting device and the smoke gas delivery outlet is connected with a draught fan and delivers hot smoke gas outwards. The comprehensive utilization device for smoke gas exhaust heat can not only heat water to generate steam by the heating surface of vapouring water and the heating surface of heating water, but also deliver hot smoke gas with controllable flow and temperature by the low-temperature smoke gas take-away device and the high-temperature smoke gas take-away device for manufacturing technique, thereby remarkably improving the utilization ratio of the smoke gas exhaust heat.

Description

technical field [0001] The invention belongs to the field of industrial waste heat recovery equipment, and in particular relates to the improvement of waste heat boiler technology. Background technique [0002] Industrial waste heat often appears in the form of hot flue gas, which is usually used to generate steam. In the waste heat boiler, the exothermic process of the flue gas and the heat-absorbing vaporization process of the water are carried out, and the heat is transferred from the flue gas to the water. The transfer of heat is accompanied by an increase in entropy, resulting in a decrease in the quality of thermal energy. An ideal waste heat boiler should make the entropy increase as small as possible. The exothermic process of the flue gas is a cooling process of the gas, and its exothermic temperature curve is a monotonically decreasing curve. The process of water absorbing heat to generate steam is a process involving phase change, and its temperature curve is a...

AI Technical Summary

Problems solved by technology

Therefore, this waste heat utilization method that simply generates steam has the characteristics of high entropy increase, that is, a large drop in heat grade

In addition, due to the mismatch between the heat release temperature curve of the flue gas and the heat absorption and vaporization temperature curve of water, the waste heat recovery rate is low

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