Sintering machine denitration flue gas heating system

Abstract

The invention discloses a sintering machine denitration flue gas heating system which comprises a flue gas-heat conduction oil heat exchanger and a heat conduction oil-flue gas heat exchanger, wherein waste heat flue gas in the steel production process is fed into a shell pass of the flue gas-heat conduction oil heat exchanger and exchanges heat with heat conduction oil flowing in a shell inner tube pass; the oil outlet end of the shell inner tube pass of the flue gas-heat conduction oil heat exchanger is connected with the oil inlet end of the shell inner tube pass of the heat conduction oil-flue gas heat exchanger, and the oil outlet end of the shell inner tube pass of the heat conduction oil-flue gas heat exchanger is connected with the oil inlet end of the shell inner tube pass of the flue gas-heat conduction oil heat exchanger; and flue gas of a sintering machine enters the shell pass of the heat conduction oil-flue gas heat exchanger, exchanges heat with heat conduction oil in the shell inner tube pass, and then is fed into a sintering machine flue gas denitration device. According to the heating system, waste heat flue gas in the steel production process is utilized, indirect heat transfer is achieved through the heat conduction oil, the denitration flue gas in the sintering machine flue gas denitration device is heated, that is, the waste heat flue gas is utilized for heating the heat conduction oil, the heat-holding heat conduction oil heats flue gas to be denitrated, and then the temperature of the denitration flue gas is increased.

Description

technical field [0001] The invention belongs to the technical field of sintering machine denitrification flue gas heating, and relates to a sintering machine denitrification flue gas heating system. Background technique [0002] In the sintering machine flue gas denitrification heat supplement system, the commonly used technical route is: the flue gas at the denitrification inlet and the flue gas at the denitrification outlet conduct GGH heat exchange, and the insufficient part uses gas to supplement heat, such as: authorized announcement number CN 104930533 B, patent right Man-made patent of Shanghai Baosteel Energy Conservation and Environmental Protection Technology Co., Ltd.: flue gas reheating device for sintering flue gas denitrification: flue gas reheating device for sintering flue gas denitrification, which is the denitrification flue gas after adding GGH. [0003] Application publication number CN 111306564 A, the applicant is the patent of Nanjing Jinhan Environmen...

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Problems solved by technology

[0007] The above data shows that the heating mode of the denitrification flue gas of the sintering machine is GGH+gas reheating (or called gas supplementary heating), which is mature and reliable in terms of technology, but it is not worth the candle in terms of thermal economy, especially in areas with high electricity prices , It is more economical to use high-quality gas to heat the denitrification flue gas. It is more economical and applicable to heat the denitrification flue gas without ring-cooled flue gas. There are many unfavorable factors in the flue gas denitrification technical transformation project of sintering machine, such as narrow site, limited space, etc., as well as the economic comparison between smoke pipe and heat transfer oil pipe, and the pressure problem of heat exchange between smoke water and smoke heat transfer oil

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