Protection method of pulverized-coal boiler heated tube
A technology for pulverized coal boilers and heating tubes, which is applied in metal material coating process, melting spray plating, coating and other directions, can solve the problems of troublesome maintenance work, scouring wear, corrosion of heating tubes, etc., and achieves good effect and compact appearance. Effect
Inactive Publication Date: 2014-12-03
无锡柯马机械有限公司
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Problems solved by technology
[0003] In order to solve the problem of erosion, wear and corrosion, the heat-resistant and high-temperature-resistant coating is currently used with poor effect, and its service life is less than one year, so its later maintenance work is more troublesome. If the maintenance is not timely, the heating pipe will be damaged due to long-term erosion. corrosion
Method used
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Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0009] The corroded parts of pulverized coal boilers are usually water wall tubes, superheater tubes, reheater tubes and gas saving tubes, the so-called "four tubes". These parts are in direct contact with the flame and combustion products during the combustion of pulverized coal, and are subject to the combined effects of high temperature, corrosion, wear and stress and fail.
[0010] Boiler tube burst not only seriously affects the normal operation of the generator, but also causes significant economic losses to the power plant.
[0011] The protection method of the heating tube of the pulverized coal boiler adopts the arc spraying method for protection. The spraying material is zinc wire, aluminum wire, aluminum alloy wire or copper wire. Evenly and continuously feed them into the conductive nozzles in the arc spray gun respectively, the conductive nozzles are respectively connected to the positive and negative poles of the power supply, and ensure reliable insulation betwe...
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The invention provides a protection method of a pulverized-coal boiler heated tube. An arc spraying process is used for protection, and the spraying material is zinc wires, aluminum wires, aluminum alloy wires or copper wires. In the spraying process, the two spraying metal wires are uniformly, continuously and respectively fed into contact tubes of an arc spraying gun through wire feed rolls by using a wire feeder, wherein the contact tubes are respectively connected with positive and negative poles of the power source and ensure reliable insulation before the two wires contact each other. When the ends of the two metal wires contact each other, a short circuit is formed between the ends, and arcs are generated, so that the ends of the wires are molten instantaneously, and compressed air atomizes the molten metal into micro molten drops and injects the micro molten drops onto the surface of the tube wall. The method has the advantages of favorable effect, long service life (more than five years) and compact appearance.
Description
technical field [0001] The invention relates to a protection method for a heat receiving pipe of a pulverized coal boiler, which belongs to the technical field of machinery. Background technique [0002] Due to the long-term scour of high-temperature dust-laden airflow, the heating tubes of pulverized coal boilers have serious surface corrosion and wear, and tube burst accidents may also occur. The furnace tube is in the flame of 1200°C in the furnace, the metal elements (mainly Fe) that make up the furnace tube react with oxygen to form oxides, which are incompatible with the original materials in terms of phase composition and structure. Stress is generated, and eventually delamination and thinning of the furnace tube. The S in the coal is oxidized to generate SO2 or SO3, which is converted into H2S when the air ratio is low or the flue gas content increases, and the latter forms FeS with the Fe element of the furnace tube, causing the delamination of the furnace tube. ...
Claims
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IPC IPC(8): C23C4/16C23C4/08C23C4/131
Inventor 孙建新
Owner 无锡柯马机械有限公司