A method for anti-clogging of heat storage elements at cold end of air preheater by separating rings

Abstract

The invention discloses a ring dividing anti-blocking method for a cold end heat storage element of a rotary air preheater. Partition plates are arranged on the end surface of the cold end of a rotorof the rotary air preheater, so that the end surface of the cold end is divided into more than two independent air inlet channels, and anti-dust-blocking hot air is used for blowing the air inlet channels to perform the anti-blocking purpose. According to the method, by reducing the section of the anti-dust-blocking hot air flow in the same time period and reducing non-organized air leakage of ananti-dust-blocking dividing bin, the purpose of reducing the use amount of the anti-dust-blocking hot air is achieved on the premise that the anti-dust-blocking effect of the rotary air preheater is guaranteed, and the method has the outstanding advantages that the investment is saved, the operation cost is low, and the anti-blocking effect is remarkable.

Description

technical field [0001] The invention relates to a method for preventing clogging by ring separation of a heat storage element at the cold end of an air preheater, and belongs to the technical field of ash clogging prevention of an air preheater. Background technique [0002] Rotary air preheater (referred to as "air preheater") is a heat exchange equipment used in large power station boilers. It uses the heat of boiler flue gas to heat the air required for combustion to improve the efficiency of the boiler . [0003] The focus problems of air preheaters mainly include ash blocking, high air leakage rate, low heat transfer efficiency, serious low temperature corrosion, etc. These problems have long affected the safe and economical operation of air preheaters and the entire boiler system. [0004] The above problems have been around for a long time, and they are mutually reinforcing and influencing each other. In recent years, with the general operation of the denitration sy...

AI Technical Summary

Problems solved by technology

At present, the air preheater adopts the hot air counterflow anti-blocking scheme that has been applied, but due to the limited anti-blocking hot air flow rate, the anti-blocking hot air flow rate is low when the flow cross-section is large, and the heat is mainly transferred to the cold end. Although the sulfuric acid-type sticky ash of the heat storage element can be removed, the ammonium bisulfate-type sticky ash that penetrates into the middle and upper part of the heat storage element is not effective.

The reason is that when the flow rate of the anti-blocking ash hot air is low, the temperature drop of the hot air flowing through the ammonium bisulfate deposition zone is relatively large, which is not enough to gasify ammonium bisulfate, and is not enough to carry the ammonium bisulfate type after the flow rate is reduced. Sticky ash; in addition, the flow channel of the cold-end thermal storage element cannot be guaranteed to be completely closed. After the local high-velocity anti-blocking ash hot air blows into the thermal storage element, it diffuses inside the cold-end thermal storage element, and cannot penetrate to maintain a high flow rate throughout the process.

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