PTC electric heating device used on dust hopper of electric dust remover

Abstract

The invention provides a PTC electric heating device used on a dust hopper of an electric dust remover. The PTC electric heating device comprises a plurality of PTC heating elements and a controller,wherein the PTC heating elements are distributed on the outer wall of the dust hopper; the controller divides the plurality of PTC heating elements into a plurality of heating units to be sequentiallyswitched on; after the controller switches on one heating unit, the controller detects the power value change of the switched-on PTC heating element until the power value is lower than a preset valueof the controller; and then, the controller switches on the next heating unit. The PTC material is used as a heating element; the heating power can be automatically regulated according to the temperature change; the heating temperature is automatically controlled in a position near the target temperature; the additional arrangement of a control device is not needed; the fault occurrence rate dueto the control device is reduced; the operation mode of feeding the PTC heating elements in batches is used; the current bearing capability of a cable is sufficiently used; the work of the whole device cannot be influenced due to the damage of partial PTC heating elements; the risk of system operation incapability due to local damage is avoided; and the system operation reliability is improved.

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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