A ptc electric heating device used on the ash hopper of the electric dust collector

Abstract

The present invention provides a PTC electric heating device used on an ash hopper of an electrostatic precipitator, comprising a plurality of PTC heating elements arranged on the outer wall of the ash hopper and a controller; the controller divides the plurality of PTC heating elements into Multiple heating units are turned on in sequence; after the controller turns on one heating unit, the controller detects the change of the power value of the turned on PTC heating element until the power value is lower than the preset value of the controller, and then the controller turns on the next heating unit. The invention uses the PTC material as the heating element, can automatically adjust the heating power according to the change of temperature, control the heating temperature near the target temperature by itself, does not need to install a control device, and reduces the failure rate caused by the control device; The operation mode of PTC heating elements makes full use of the ability of the cable to carry current; the damage of some PTC heating elements will not affect the operation of the whole device, avoiding the risk of system failure due to partial damage, and improving the reliability of system operation.

Description

technical field [0001] The invention relates to the field of electric heaters, in particular to a PTC electric heating device used on an ash hopper of an electric dust collector. Background technique [0002] In order to reduce the emission of air pollutants, coal-fired power plants must be equipped with a dust removal system to collect the soot particles in the exhaust. The ash hopper is an important ash storage device in the dust removal system. The ash hopper is equipped with a heating system to prevent it from being blocked during operation. The reliable operation of the ash hopper heating system is important for the normal ash storage and ash discharge of the ash hopper, as well as the safety and stability of the entire unit. Running is all that matters. [0003] The temperature of the ash hopper has an important impact on its safe and stable operation. When the temperature inside the ash hopper is low, it will lead to the occurrence of clogging of the ash hopper. Sul...

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Problems solved by technology

The steam heating method uses high-temperature steam as the heat source to heat the ash hopper, making full use of a large amount of low-pressure exhaust steam in the power plant, and the heating cost is low, but improper drainage of the heating pipe will lead to local over-temperature or heating failure, which will affect the stable operation of the system; The heating method uses electric heating elements to heat the outer wall of the ash hopper, but it needs to install an automatic temperature control device and a temperature measuring element to control its heating temperature. However, the operating environment of the ash hopper has high dust concentration, high humidity, mechanical and thermal shock strength. Under such environmental conditions, the failure rate of the automatic temperature control device is relatively high, which leads to quite serious accidents, which greatly reduces the safety and reliability of conventional ash hopper heaters.

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