Anti-corrosion and anti-blocking self-cleaning vertical tubular air preheater

Abstract

The invention provides an anti-corrosion and anti-blocking self-cleaning vertical tubular air preheater which is simple and reasonable in structure, high in dust removal proactivity and long in service life. The anti-corrosion and anti-blocking self-cleaning vertical tubular air preheater comprises an air preheater box body and multiple preheating modules. The multiple preheating modules are arranged in the air preheater box body side by side, air preheater partitions are arranged between the adjacent preheating modules, multiple air partitioning devices are arranged on the portions, at the positions of air channel inlets, of the air preheater box body, and each air partitioning device corresponds to one preheating module. A flue gas recovery device is arranged on the portion, at the position of a high-temperature flue gas channel outlet, of the air preheater box body and communicates with the position of a high-temperature flue gas channel inlet through a circulating pipeline. The initial investment is small, large-scale use and popularization are convenient, dust stratification adhesion of preheating module pipelines is avoided through the internal structure of the air preheater,anti-corrosion and anti-blocking treatment on the pipelines is achieved, the resistance of the air preheater is reduced, and the operation and maintenance cost of a coal-fired unit is reduced.

Description

technical field [0001] The invention relates to an air preheater, in particular to a vertical tube air preheater. Background technique [0002] The air preheater is a device that uses the waste heat of the flue gas at the tail of the boiler to heat the fuel to prepare and burn the air required. The air preheater is used in the boiler system, which not only improves the thermal efficiency of the boiler, but also improves the combustion conditions, reduces the incomplete combustion heat loss of the fuel, and strengthens the radiation heat transfer in the furnace, and saves the evaporation heating surface. [0003] Under normal circumstances, the air preheater located at the tail of the boiler is usually arranged in the low-temperature flue gas area containing water vapor and sulfuric acid vapor. The working conditions are relatively harsh, and low-temperature corrosion and ash blocking are prone to occur. The air preheater located in the low-temperature area of ​​the boiler, ...

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Problems solved by technology

Moreover, with the implementation of ultra-low emission standards for coal-fired units, NO X Emission indicators are strictly controlled at 50mg / nm 3 As a result, the problem of dust blocking in the air preheater will become more and more serious

Technicians have adopted a variety of methods, such as adopting enamel heat storage elements, strengthening the steam soot blowing management of air preheaters, burning coal with relatively low sulfur content, and limiting the escape of ammonia from SCR depletion, etc., but they still cannot effectively solve the problem. Air preheater clogging problem

This problem is common in the industry. According to the current design, installation and key parameter monitoring level of the desulfurization system, it is difficult to achieve its performance design value by using the general air preheater ash blocking treatment technology.

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