Two-section high-temperature fluidized bed roasting furnace for waste casting sand

Abstract

The invention relates to a two-section high-temperature fluidized bed roasting furnace for waste casting sand. The fluidized bed roasting furnace is characterized by comprising a first-section fluidization chamber, a first-section high-pressure combustion chamber, a second-section fluidization chamber, a second-section air preheating chamber and a second-section air collection chamber, wherein a sand inlet channel and a first-section fluidization nozzle are formed in the first-section fluidization chamber, and the first-section fluidization chamber is communicated with the second-section fluidization chamber through a first-section sand discharging pipe; the lower end of an air inlet pipe in the second-section air preheating chamber is communicated with the second-section air collection chamber, the upper end of the air inlet pipe is arranged at the lower part of the second-section fluidization chamber, a fluidization nozzle is formed in the upper end of the air inlet pipe, and a fluidized air inlet is formed in the second-section air collection chamber; a second-section sand discharging pipe is arranged in the second-section air collection chamber, the upper end of the second-section sand discharging pipe is communicated with the second-section air preheating chamber, a sand discharging valve is mounted at the lower end of the second-section air collection chamber, an outlet in the lower end of the sand discharging valve is connected with a sand collecting hopper, and a sand outlet is formed in the lower end of the sand collecting hopper. According to the fluidized bed roasting furnace, the occupied area is small, the residual heat of flue gas can be recovered, and the heat efficiency is improved.

Description

technical field [0001] The invention relates to a roasting furnace, in particular to a two-stage high-temperature fluidized bed roasting furnace for waste sand. Background technique [0002] With the continuous development of casting technology, a large amount of mixed waste mold (core) sand is produced in the casting process, which has caused great pollution and harm to the environment and a great waste of social resources, which does not conform to the circular economy requirements. In order to recycle the mixed waste mold (core) sand, the development of low energy consumption, large capacity and high temperature fluidized bed roasting furnace is an urgent task in my country's foundry industry. The recycling of waste mold (core) sand is related to casting cost, resource conservation, energy consumption and environmental protection. [0003] With the development of casting technology in our country, the use of chemical binder sand has been widely used, which makes the was...

AI Technical Summary

Problems solved by technology

In the past, the thermal regeneration furnace that processed 1 to 2 tons of resin sand per hour can no longer meet the thermal regeneration needs of mixed waste mold (core) sand.

Images