Method for in-furnace leakage detection and non-disturbance leakage stoppage in operation state of boiler economizer

Abstract

The invention belongs to the technical field of circulating fluidized bed boilers, and particularly relates to an in-furnace leakage detection and non-disturbance leakage stoppage method under the operation state of a boiler economizer. The method comprises the following steps: leakage detection: acquiring the temperature of the economizer through an acquisition unit, transmitting the temperature to a data processing unit, judging whether the temperature is different from an initially set temperature or not, and if the temperature of a certain area is different, preliminarily determining that leakage occurs in the area; dismantling upper tubes of a tube panel header tube seat at a leakage area for heat preservation, and numbering the upper tubes of the economizer header tube seat in the area; measuring the outer surface temperatures of the tubes one by one and recording; and if the temperature of the outer surface of a certain tube is higher than that of other tubes, accurately judging the leakage of a tube panel; and leaking stoppage: carrying out under-pressure leakage stoppage on the leaked tube panel in the boiler operation state. In-furnace leakage of the economizer can occur in the normal operation state of a boiler, the boiler is not stopped, the leakage position is accurately detected, leakage stoppage of the tube panel of the economizer is implemented, and loss is reduced.

Description

Technical field [0001] The present invention belongs to the technical field of circulating fluidized bed boiler, particularly relates to furnace A boiler leak the operating state and the economizer non-disturbance plugging method. Background technique [0002] Circulating fluidized bed boiler economizer, superheater boiler important four members, a single stage economizer screen pair, and the tube panel pitch by the above general design for the 30--40mm pipe group 100, the general design of the tube panel height is greater than 1200mm, the economizer operating temperature of about 400 ℃, economizer tube panel once leakage occurs during operation of the boiler, must be shutdown for maintenance, repair only the minimum time required for the leakage site 96 hours a direct result of the shutdown economic losses of 100 million yuan. [0003] Maintenance shutdown procedures: [0004] 1, i.e., 48 hours after the shutdown in the rear of the boiler economizer parts by the temperature drop...

AI Technical Summary

Problems solved by technology

[0002] The economizer and superheater of circulating fluidized bed boilers are important four-tube parts of the boiler. The single-stage economizer is composed of more than 100 sets of tube panels. The tube panel pitch is generally designed to be 30--40mm, and the tube panel height is generally designed If it is larger than 1200mm, the operating temperature of the economizer is about 400°C. Once the economizer tube panel leaks during the operation of the boiler, the boiler must be shut down for inspection. The shortest time required to repair the leak point is 96 hours, which is directly caused by the shutdown of the boiler once. Economic loss of more than 1 million yuan

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