Tin-iron composite steel pipe

Abstract

The invention discloses a tin-iron composite pipe according to the current condition of flue gas dew point corrosion of an oil refining and heating furnace and a power boiler. Compared with an existing heat exchange steep pipe for an air preheater of the oil refining and heating furnace or a coal economizer of the power plant boiler, the flue gas dew point corrosion of a steel pipe is avoided. A layer of tin metal is compounded outside the tin-iron composite pipe, and the thickness of a tin layer is 0.8-1.5 mm. The tin-iron composite pipe has the benefits that the tin-iron composite pipe not only has the strength of the steel pipe, but also has the thermal conductivity of the steel pipe and is used in a flue gas area with a temperature lower than 250 DEG C, the corrosion of the air pre-heater or the coal economizer is effectively avoided, and the service life of equipment is prolonged.

Description

technical field [0001] The invention relates to the field of industrial furnaces in oil refining, chemical and electric power industries, in particular to heat exchange steel pipes inside air preheaters or economizers of equipment subjected to flue gas dew point corrosion. Background technique [0002] Air preheaters and boiler economizers, as important accessories of petrochemical power system heating furnaces and boilers, mainly play the role of energy recovery and utilization, and are the main equipment for energy saving and consumption reduction. In the past 20 years, in order to improve the service life of the air preheater or economizer and avoid the dew point corrosion of the flue gas, a lot of scientific research work has been done on the heat exchange steel pipes of the equipment at home and abroad, trying to find a long-term operation of the heat exchange Steel pipes, currently popular steel pipes mainly include the following types: [0003] 1 Ordinary steel pipe:...

AI Technical Summary

Problems solved by technology

At present, there are no less than a hundred kinds of enhanced heat transfer tube technologies. Through enhanced heat transfer, the heat transfer efficiency can be increased by more than 50%, but the dew point corrosion resistance is poor, the metal temperature of the cold air end tube wall is low, and there is typical triangular area corrosion. The service life is less than 2 years;

But the disadvantage is that the investment is too large, the enamel is fragile, and it is prone to damage during installation

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