Application of electric heating cable for ash hopper in waste incineration plant dust collector

Published on:

2023-03-02 11:26

After the dusty gas enters through the air intake, the dust is affected by the windshield, the air flow is increased and the flow rate is reduced, some of the large dust particles are transferred to the ash hopper by gravity, and the fine particles are filtered and cleaned by the bag filter, And the dust remains in the air. After cleaning the surface of the bag filter, the flue gas enters the upper box through the mouth of the bag filter and is discharged from the chimney. When the amount of dust accumulated on the filter bag reaches its nominal value, the pulse valve releases compressed air and the dust falls from the filter bag surface into the ash bin. The dustbin collects and throws dust into the ash hopper.

However, due to the fact that the ash hopper and the reactor are in a low-temperature state for a long time, a large amount of fly ash is condensed, and the dust is corroded to a certain extent. Therefore, it is necessary to heat the ash hopper, the bottom of the reactor and related equipment, and pipes and valves from the screw conveyor, the chain conveyor to the bucket elevator to solve the problem of fly ash condensation. On the surface of the equipment after burning.

The ash temperature after combustion is about 250 °C, and the fly ash condenses on the walls of the equipment at a temperature of about 120 °C. Therefore, mineral insulated heating cables with mineral insulation can be considered. The mineral insulated MI heating cable consists of a metal core (heater body), the core is tightly surrounded by mineral magnesium oxide (insulation layer) and a metal tube (usually made of copper, steel or stainless steel, 316L alloy, 825, etc. E.). If desired, the layer of the anticorrosive outer shell of polyperfluoroethylene-propylene can be squeezed out of the metal shell.

Heating cables with mineral insulation are suitable for anti-freezing in industry or construction, as well as for heat preservation and heating of process environments. Especially for pipelines that require high power output or must withstand high temperature steam blowing, and operate at high temperature for a long time, in environments that require corrosion and explosion protection.

When the boiler has just started, preheat the side of the bottom third of the area or half the height of the ash hopper for a period of time, usually 8-10 hours. Preheating prevents dust condensation in the ash bin and at the same time significantly reduces operating costs. It should be noted that in conventional production, the electric heating cable does not work. Only when the ash hopper is not working is the electric heating system turned on to ensure normal operation of the equipment next time.

The electric heating system we developed for dust removal and ash bins is mainly designed for heating, heat preservation and anti-freeze protection of ash bunkers in environmental protection industries such as incinerators and thermal power plants that can guarantee. that dust and moisture condensation, Dust accumulation and blockage can be prevented at a long set temperature smooth flow. Its installation is very simple, as a rule, it is installed between the ribs of the hardness of the ash hopper by winding the outer wall. In use, the heat cycle will be performed according to this temperature, and the wall temperature of the ash hopper will be increased to a given maintenance temperature. When the maintenance temperature is reached, the heating cycle duration of the ash hopper heating system is 40% to 60% of the total heating time depending on different ambient temperatures.

At present, our mineral insulated heating cables are used in the bag filter at the domestic waste incineration plant in Lanzhou Zhongpuzi, the waste incineration plant in Tianjin in Wuqing and the waste incineration power plant in Jiangxi Xinfeng.

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