A method for cleaning ash and slag on convection section fins of steam injection boiler

Abstract

The invention provides a method for cleaning accumulated ash of convection section fins of a steam-injection boiler. The method comprises the steps that a convection section side plate is opened, ash in the air is removed, and floating ash in a convection section is removed; the convection section side plate is shielded by a waterproof cloth, a waterproof cloth is laid beneath the fin at the lowest layer of the convection section, and a water receiving groove is placed; a boiler door is opened, a waterproof cloth is laid on a transition section, and secondary protection is conducted; a cleaning agent is sprayed, spraying and moistening are conducted until scales are loosened, and a water gun with pressure is used for cleaning up the scales; the step of spraying the cleaning agent and cleaning up the scales by the water gun with pressure is executed again until the scales are cleaned up. When the cleaning agent and the cleaning method are adopted, the scales of the fins can be effectively cleaned up, the slag and scale removing rate is larger than 95%, corrosion and damage to pipes, heat insulation materials and the like on equipment are avoided, and the thermal efficiency of the boiler can be improved.

Description

technical field [0001] The invention relates to a method for cleaning ash deposits on fins of a convection section of a steam injection boiler, and belongs to the technical field of steam injection boilers in oil fields. Background technique [0002] After long-term oil-burning operation, the steam injection boiler in the oil field has a variety of conditions such as incomplete combustion and operation below the dew point, which will cause serious ash accumulation over time, especially in the convection section of the steam injection boiler in the oil field (coal-saving The dust accumulation on the fins of the device) is quite serious, and the dust accumulation on the fins becomes very hard due to attachments such as sulfuric acid oxides, rust, ash, coke, etc., and is difficult to deal with. Dust accumulation will cause blockage of the flue, poor heat transfer effect, and corrosion of the furnace tube, which will seriously affect the operation economy and safety. [0003] T...

AI Technical Summary

Problems solved by technology

[0002] After long-term oil-burning operation, oil field steam injection boilers have many situations such as incomplete combustion and operation below the dew point, which will cause serious ash accumulation over time, especially in the convection section of oil field steam injection boilers (coal-saving The dust accumulation on the fins is quite serious, and the dust accumulation on the fins becomes very hard due to attachments such as sulfuric acid oxides, rust, ash, coke, etc., and it is difficult to handle

Dust accumulation will cause flue blockage, poor heat transfer effect, corrosion of furnace tubes, and seriously affect operation economy and safety

[0003] Therefore, it is necessary to clean the soot deposits on the fins of the convection section (economizer) of the steam injection boiler in the oil field. The conventional soot cleaning method is mainly to clean the floating ash on the surface of the fins, and cannot remove the hard slag

And how to remove the hard slag and improve the heat absorption capacity of the boiler, there is no good method at present

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