Adjustable double-bed anti-corrosion external high-temperature superheater ash return device and method

Abstract

The invention discloses an adjustable double-bed anti-corrosion external high-temperature superheater ash return device and method. A heat exchange chamber and a material return chamber of the high-temperature superheater ash return device are partitioned through a partition plate, the height of the partition plate is adjustable, a channel is formed between the lower portion of a partition wall and a wind distribution plate, and thus the two chambers communicate with each other. A heat exchange wind chamber and a material return wind chamber are arranged on the bottom of the heat exchange chamber and the bottom of the material return chamber and communicate with the heat exchange chamber and the material return chamber. According to the device, by adjusting the partition plate to differentheights, circulation flow of the ash return device can be effectively adjusted, the bed temperature is adjusted beneficially and flexibly, and the situation that garbage fuel containing components like glass is molten at a high temperature, adheres to a heat exchange pipe or blocks a slag discharging opening, and safety operation of an incinerator is jeopardized can be avoided. The situation thata superheater pipe bundle is corroded by high-temperature acid gas containing HCI, and corrosion is caused can be avoided. Ash in the device moves in a bubbling fluidized bed state, the heat exchangecoefficient is higher than that of the heating surface of a superheater arranged in a boiler flue, the metal consumption of the superheater can be greatly reduced, and the device is suitable for thecirculating fluidized bed garbage incinerator.

Description

Technical field[0001]The invention belongs to the design field of a circulating fluidized bed external high-temperature superheater, and in particular relates to an adjustable double bed anti-corrosion external high-temperature superheater ash returning device and method.Background technique[0002]In recent years, circulating fluidized bed incineration of garbage has become an efficient and environmentally friendly treatment method. Due to the wide range of sources of garbage, the chlorine content is higher than that of coal, and high temperature flue gas containing corrosive gases such as HCI is generated during incineration, which is very easy to corrode tail smoke. The heating surface such as the superheater in the duct reduces the heat exchange efficiency and endangers the safe operation of the unit for a long time. Therefore, the current circulating fluidized bed adopts the form of partially arranging the heating surface of the superheater outside the flue. The cyclone separator...

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Problems solved by technology

[0006] The main purpose of the present invention is to overcome the deficiencies of the prior art, and provide an adjustable double-bed anti-corrosion external high-temperature superheater ash return device and its method to solve the problems existing in the existing waste incinerator external heat exchanger device. Susceptible to the problem of high-temperature acid gas corrosion, the height of the partition wall is adjustable, so as to realize the function of flexibly adjusting the flow rate of circulating ash and the temperature of the furnace

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