Boiler waste heat recycling and pipe anti-abrasion system

Abstract

The invention relates to a boiler waste heat recycling and pipe anti-abrasion system. According to the boiler waste heat recycling and pipe anti-abrasion system, an air preheater pipe can be prevented from being corroded, the service life of an air preheater is prolonged, energy can be saved, and environment pollution is avoided at the same time. Meanwhile, the differential pressure of saturated steam and superheated steam is utilized, the saturated steam is used for replacing attemperation water for decreasing temperature, the service life of a boiler is greatly prolonged, and the problems of superheater pipe burst and desuperheater damage due to large temperature difference of a desuperheater are effectively solved; and in addition, pipe bends and pipe corners can be prevented from being abraded, and the service life of pipes is prolonged.

Description

technical field [0001] The invention relates to a waste heat recycling system and a pipeline anti-wear system, belonging to the technical field of energy saving and environmental protection. Background technique [0002] Power plant boilers, industrial boilers, and industrial furnaces need to pass cold air into the air preheater through a fan. The air preheater heats the cold air and sends it to the boiler for use. Exposure to cold air causes dew condensation corrosion, which will be corroded in less than 2-3 years, resulting in air leakage from the air preheater, resulting in frequent replacement of the air preheater and high maintenance costs. The device, and the installation position is high, it is inconvenient to disassemble and repair, and the maintenance time is long. [0003] At the same time, power plant boilers, industrial boilers, and industrial furnaces will produce waste gas, waste water, waste steam, waste residue, etc. during industrial production, which conta...

AI Technical Summary

Problems solved by technology

[0006] 1. Water spray desuperheating method is used to control the boiler steam temperature. Boilers using water spray desuperheating method are likely to cause weld cracks in the desuperheater header and cracks on the inner wall of the pipe.

The reason is that the temperature difference between the feed water temperature (104°C) used for boiler steam desuperheating and the steam temperature after desuperheating (540°C) is too large, and the excessive temperature difference can also cause problems such as superheater tube burst

[0007] 2. The surface desuperheating method uses all the desuperheating water to control the temperature of the main steam through the surface desuperheater. The surface desuperheating is generally used in small boilers. The main disadvantage is that the temperature adjustment of the main steam of the boiler is not sensitive

[0008] 3. The self-made condensing water spray desuperheating method also has problems such as insensitive adjustment, large temperature difference, and superheater tube burst.

[0009] During the operation of the boiler, pulverized coal is fed into the burner through the pipeline for combustion. During use, the pulverized coal pipeline is often worn and perforated, especially at the elbow of the pulverized pipeline, which is most likely to wear through, causing coal leakage to pollute the environment. , and even cause pipeline coal dust explosion

In order to ensure the safe operation of the pipeline and prolong the service life of the elbow, it is generally used to thicken the material of the pipeline elbow or spray wear-resistant materials, but it is still easy to wear and tear, and its life can only be slightly extended.

[0010] During the operation of the boiler, there will be steam-water mixture passing through the steam-water pipeline in the boiler. The water in the steam-water mixture will drip on the inner wall of the corner when it passes through the corner of the pipe. The dripping water for a long time will cause the corner of the pipe to wear, especially the steam turbine. Severe abrasion and leakage often occur at the corners of the steam extraction pipeline. In order to ensure the safe operation of the pipeline and prolong the service life of the corners, the material of the corners of the pipelines is generally thickened or sprayed with wear-resistant materials, but it is still easy to wear and can only be slightly extended. its lifespan

Images