A repairing process for rapid on-line leak detection of air preheater
An air preheater and leak detection technology, applied in the direction of detecting the appearance of fluid at the leak point, using liquid/vacuum degree for liquid tightness measurement, etc., can solve the problem of coal-fired boiler air preheater maintenance has not been effectively Solve the problems that consume a lot of maintenance time and maintenance costs, restrict the normal operation of coal-fired boilers, etc., and achieve the effect of reducing maintenance personnel, reducing maintenance time and saving maintenance costs
Active Publication Date: 2016-07-06
WUYANG IRON & STEEL
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Problems solved by technology
Therefore, in the current situation, it takes a lot of maintenance time and maintenance costs to overhaul the air preheater, which affects the continuity of production and reduces the economic benefits of the enterprise.
So far, the maintenance problem of the air preheater of the coal-fired boiler has not been effectively solved, and it has become a chronic problem restricting the normal operation of the coal-fired boiler, which needs to be solved urgently
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[0021] The maintenance method adopted in the present invention is: install the feeding device 4 on the air supply duct 3 of the air preheater 1, the white lime 6 enters the inner circulation of the air preheater 1 from the feeding device 4, and part of the white lime 6 enters with the high-temperature air supply In the combustion chamber of the boiler, part of the white lime 6 enters the damaged heat exchanger tube 5 in the air preheater 1, and white lime traces appear at both ends of the heat exchanger tube 5, and the heat exchanger with white lime traces at both ends Tube 5 is the damaged heat exchanger tube 5 .
[0022] As shown in the figure, the upper part of the air supply duct 3 of the air preheater 1 is close to 1-1.5 meters of the air preheater 1 to open a hole to install the feeding steel pipe 7, and the length of the feeding steel pipe 7 inside the air supply duct 3 reaches the air supply duct 2 / 3 of the height, the length of the feeding steel pipe 7 outside the air...
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The invention belongs to the technical field of maintenance methods for air pre-heaters and provides a maintenance process for online fast leakage detection for air pre-heater. The maintenance process is used for online fast leakage detection for the air pre-heater of a coal-fired boiler. According to the technical scheme, a charging device is installed on an air supply channel of the air pre-heater, white lime enters the air pre-heater from the charging device and circulates, a part of the white lime enters a boiler combustor along with high-temperature air supply, another part of the white lime enters a damaged heat exchanger tube in the pre-heater, traces of the white lime appear at the two ends of an opening of the heat exchanger tube, and the heat exchanger tube with the traces of the white lime at the two ends is the damaged heat exchanger tube. By the adoption of the maintenance process, off-line leakage point detection of the whole air pre-heater is avoided, or the phenomenon that lamplight is adopted for checking heat exchanger tubes one by one is avoided, the maintenance time is shortened, the number of maintenance personnel is reduced, the labor intensity is lowered, and the maintenance expense is saved; the maintenance process solves the air pre-heater maintenance problem which restricts smooth running of production for a long time, continuity of the production is ensured, and economic benefits are increased.
Description
technical field [0001] The invention relates to an online rapid leak detection repair process for an air preheater of a coal-fired boiler, belonging to the technical field of air preheater repair methods. Background technique [0002] The air preheater is one of the supporting equipment for coal-fired boilers. During use, because the air preheater of the coal-fired boiler is corroded by high-temperature sulfur-containing smoke and long-term scoured by the pressure air source, the heat exchanger tubes in the air preheater are often damaged, and when the heat exchanger tubes are seriously damaged, it will cause The coal-fired boiler cannot operate due to insufficient air pressure of the blower. When the air preheater is being maintained, it is necessary to use the entire air preheater offline to check for leaks or use lights to check the heat exchanger tubes one by one. Since each preheater has about 700-1000 heat exchanger tubes, the treatment It will take 20-30 days to com...
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IPC IPC(8): G01M3/20
Inventor常刘刚
OwnerWUYANG IRON & STEEL