Ash removal device for heat exchange pipe of tail flue of boiler

Abstract

The invention relates to an ash removal device for a heat exchange pipe of a tail flue of a boiler, which comprises a helical spring and a pull rod. The axial direction of the pull rod is parallel to the extension and retraction direction of the helical spring; one end of the pull rod is connected with one end of the helical spring; the helical spring is wound outside the cleaned heat exchange pipe; the pull rod passes through the flue wall of the boiler; a first stop sealing plate is arranged on a rod section of the pull rod, which is positioned outside the flue wall; and a second stop sealing plate is arranged on a rod section of the pull rod, which is positioned inside the flue wall. According to the device disclosed by the invention, the accumulated dust attached onto the outer surface of the heat exchange pipe is removed by utilizing the relative motion of the helical spring along the axial direction of the outer wall of the heat exchange pipe, which is generated by the retracting and extending motion of the helical spring wound on the outer wall of the heat exchange pipe.

Description

technical field [0001] The invention belongs to the field of industrial applications, and in particular relates to a device for removing dust from boiler tail flue heat exchange tubes and a using method based on the device. Background technique [0002] In coal-fired boilers, heat exchangers such as economizers and air preheaters are arranged in the tail flue. When the ash-laden flue gas passes through each heating surface, some ash particles will be deposited on the heating surface to form ash. Timely and effective cleaning will eventually lead to an increase in boiler exhaust gas temperature, a decrease in thermal efficiency, corrosion of the heating surface, and an impact on the economy and safety of boiler equipment. Especially in garbage incinerators, the corrosion phenomenon of the heating surface at the tail is more serious after dust accumulation. How to effectively deal with the ash deposits in the heat exchange tubes in the tail flue is very important to the stabl...

AI Technical Summary

Problems solved by technology

Although the effects of these methods are obvious, the equipment investment and operating costs are high, and they are not suitable for small boiler equipment. Moreover, these soot blowing methods have troubles such as shutdown and cleaning, and long operating cycles, which cause huge economic losses to power plants and factories; The method of mechanical vibration (beating) makes the heating surface vibrate, and the ash deposits are separated from the wall and taken away by the flue gas. The method is simple and can be cleaned without stopping the furnace, but it consumes a lot of energy and is not efficient, and the equipment is heavy.

Images