Flue gas waste heat secondary utilization process device

A process device and flue gas waste heat technology are applied in the field of flue gas waste heat recovery and utilization, which can solve the problems of poor waste heat recovery of industrial furnaces and kilns, poor insulation of bypass flue pipes, and high exhaust gas temperature, so as to reduce waste of coal resources and reduce Coal consumption and high utilization rate of waste heat

Pending Publication Date: 2022-02-01
NANTONG SHANJIAN GRAPHITE EQUIP
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The reasons for the poor waste heat recovery of industrial furnaces are that, apart from the high exhaust gas temperature and the small capacity of the heat exchanger, little attention has been paid to the fact that the sensible heat of the flue gas and hot air cannot be effectively preserved, and the flue gas emerges from the furnace and sucks in the cold air. Water leakage and air leakage from the underground flue, short circuit of the bypass flue and poor heat insulation of the pipeline make the heat loss of the flue gas in most furnaces before the recovery device as high as 30%~50%, and the sensible heat loss of the hot air returning to the furnace is 20%~33%

Method used

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  • Flue gas waste heat secondary utilization process device

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Embodiment Construction

[0023] like figure 1 The flue gas waste heat secondary utilization process device shown, according to the flue gas flow, has a coal-fired boiler, a dust collector, a flue gas cooler, a desulfurization tower, and a flue gas discharge tower in sequence. There is a secondary Preheater, the secondary preheater has a secondary air inlet at the bottom and a secondary hot air outlet at the top; it also has a primary hot flue gas inlet for the boiler flue gas to enter and a primary flue gas outlet for the flue gas to exit ; In the secondary preheater, the secondary air is directly mixed with the primary flue gas to form hot air, most of which enter the air inlet of the coal-fired boiler; a small amount flows out from the primary flue gas outlet.

[0024] There is also a primary preheater, which has a heat exchange coil for the first heat exchange between air and flue gas; the heat exchange coil has a primary cold air inlet and a primary hot air outlet, and the secondary hot smoke The...

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Abstract

The invention discloses a flue gas waste heat secondary utilization process device which is sequentially provided with a coal-fired (coal-fired or fuel-fired) boiler, a secondary preheater, a dust remover, a flue gas cooler, a desulfurizing tower and a flue gas emission tower according to a flue gas flow. And a heat exchange coil pipe is arranged in the primary preheater and is used for primary heat exchange of air and flue gas. The flue gas desulfurization device has the advantages of high waste heat utilization rate, reduction of fire coal consumption and good desulfurization effect.

Description

technical field [0001] The invention relates to a flue gas waste heat recovery and utilization technology. Background technique [0002] Waste heat is the energy that is not used in energy utilization equipment under certain economic and technical conditions, that is, redundant and waste energy. It includes seven kinds of high-temperature exhaust gas waste heat, cooling medium waste heat, waste steam and wastewater waste heat, high-temperature product and slag waste heat, chemical reaction waste heat, combustible waste gas waste liquid and waste heat, and high-pressure fluid waste pressure. According to the survey, the total waste heat resources of various industries account for about 17%-67% of their total fuel consumption, and the recyclable waste heat resources are about 60% of the total waste heat resources. [0003] Recovery and utilization of waste heat is an important way to improve economy and save fuel. Metallurgical enterprises commonly use waste heat utilization...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F27D17/00F23L15/04
CPCF27D17/004F27D17/008F23L15/04F27D2017/006Y02E20/34Y02P10/25
Inventor 姚松年肖杰朱燕
Owner NANTONG SHANJIAN GRAPHITE EQUIP
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