An adjustable twin-bed anti-corrosion external high-temperature superheater dust return device and method

Abstract

The invention discloses an adjustable twin-bed anti-corrosion external high-temperature superheater dust return device and method. The heat exchange chamber and the material return chamber of the high-temperature superheater dust return device are separated by a partition, the height of the partition is adjustable, and the partition wall A channel is formed between the lower part and the air distribution plate, so that the two warehouses communicate with each other. The invention can effectively adjust the circulation flow of the ash return device by adjusting the partitions to different heights, which is beneficial to flexibly adjust the bed temperature, and avoids the melting of glass and other components contained in waste fuel at high temperature, sticking to the heat exchange tube or blocking the slag discharge port , which endangers the safe operation of the incinerator; avoids the corrosion of the superheater tube bundle caused by high-temperature acid gases such as HCI; and the movement of ash inside the device is in a bubbling fluidized bed state, and the heat transfer coefficient is higher than that arranged on the heating surface of the boiler flue superheater The heat transfer coefficient can greatly reduce the metal consumption of the superheater, and is suitable for circulating fluidized bed waste incinerators.

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 twin-bed anti-corrosion external high-temperature superheater dust return 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 garbage sources, 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 the tail smoke. The superheater and other heating surfaces in the duct will reduce the heat transfer efficiency and endanger the safe operation of the unit for a long time. Therefore, the current circulating fluidized bed adopts the form that part of the superheater heating surface is arranged outside the flue, and the cyclo...

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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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