Boiler waste heat recycling and steam temperature control system

Abstract

The invention relates to a boiler waste heat recycling and steam temperature control system. By means of the boiler waste heat recycling and steam temperature control system, the temperature of air entering an air preheater can be raised, and cold air is prevented from corroding an air inlet pipe of the air preheater; meanwhile, condensed water of an evacuated steam source of a deaerator can be recycled effectively, waste of energy and resources is avoided, and environmental pollution is avoided; in addition, a heat exchange device is mounted in front of an air feeder, and the effect of suppressing noise of a draught fan is achieved; and meanwhile, the pressure difference between saturated steam and superheated steam of a steam pocket is utilized, the saturated steam is adopted for substituting desuperheating water to lower the temperature of a boiler, thus the service life of the boiler can be greatly prolonged, and the problems that pipes of a superheater burst and a desuperheater is damaged due to the fact that the temperature difference of the desuperheater is large are effectively solved.

Description

technical field [0001] The invention relates to a waste heat recycling system and a steam temperature control 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, whic...

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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.

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