Method of avoiding low temperature corrosion of boiler air preheater

An air preheater and low-temperature corrosion technology, applied in furnaces, waste heat treatment, furnace components, etc., can solve problems such as low-temperature corrosion on the flue gas side, prevent low-temperature corrosion and ash plugging, reduce operating costs, avoid low-temperature corrosion and The effect of clogging

Active Publication Date: 2005-05-25
DP CLEANTECH HONG KONG LTD
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Problems solved by technology

[0005] In order to overcome the low-temperature corrosion on the flue gas side that is prone to occur on the heating surface of the air preheater of the power generation boiler in the prior art, a method for avoiding low-temperature corrosion of the boiler air preheater is provided, thereby increasing the service life of the air preheater and improving the transmission efficiency. Thermal efficiency, reduce boiler use and maintenance costs, reduce energy consumption, and fundamentally prevent low-temperature corrosion and ash plugging on the heating surface of the air preheater

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  • Method of avoiding low temperature corrosion of boiler air preheater

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Embodiment Construction

[0022] figure 1 Among them, a method to avoid low-temperature corrosion of the boiler air preheater, an air preheater 1 is arranged in the air duct 9 supplying air to the boiler burner, and the inside of the air preheater is composed of finned tubes and bare tubes The heating surface of the tube bundle or other structural forms, the heated working medium in the air preheater 1 is air; available hot water in other parts. After the air in the air duct 9 passes through the air preheater, it absorbs part of the heat in the hot water, and the heated hot air is directly used as boiler air distribution, and the water cooled by the air preheater 1 leaves the air preheater 1 Finally, it enters the water supply control valve 5, and is divided into two paths by the water supply control valve 5 outlet. All the way into the flue gas cooler 2, the flue gas cooler 2 is a tube bundle composed of finned tubes, light tubes or other structural forms of the heating surface, set in the boiler fl...

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Abstract

The present invention relates to a method for preventing air preheater from producing low-temperature corrosion. Said method includes the following measures: placing the air preheater into an air duct for providing distributed air for boiler, making the interior heating working fluid boiler feedwater of the air preheater be flowed out from the air preheater and divided into two portions, making one portion be fed into the flue gas cooler set in the flue to cool hot flue gas in flue, and another portion can be directly fed into the coal-saving device placed in the fuel, so that it can prevent the heated surface of air preheater from producing low-temperature corrosion and ash plug.

Description

technical field [0001] The invention relates to a method for effectively utilizing waste heat in boiler flue gas of a power plant and avoiding low-temperature corrosion of an air preheater of the boiler, and is especially applied to boilers of power plants utilizing biomass for power generation. Among them, the biomass is crop straw, sawdust, branches and so on. Background technique [0002] The air preheater of the boiler in the prior art is mostly arranged in the flue of the boiler. CN2573978Y discloses an adjustable air supply device for heat exchange in the flue of the heating furnace. The heat exchange section of the flue of the heating furnace is connected with the air preheater, and the air induction pipe at the outlet of the air preheater is connected to the induced draft fan. The inlet is connected to the burner blown into the heating furnace through the outlet pipe of the induced draft fan. A regulating duct is added at the entrance of the induced draft fan. Whe...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F27D17/00
CPCY02E20/34Y02P10/25
Inventor 蒋大龙
Owner DP CLEANTECH HONG KONG LTD
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