Wax shale vibration turn-back pre-heating dryer

Abstract

A device for preheating and drying oil shale by utilizing the flue gas exhausted by a heating furnace is characterized in that multi-layer vibration beds are distributed in a zigzag manner in a drying machine; and wet materials are dispersed into flat and pudgy material flows in a zigzag shape under the action of the multi-layer drying beds after entering the drying machine from the top thereof. Hot flue gas produced by the heating furnace is transmitted to the bottom of the drying machine after being pressurized by air distribution, so as to form a vertical airflow and a horizontal airflow which are in full and high-intensity contact with the materials. During the mixing flow process with hot wind, the material is evenly preheated and dried after the repeated process of mixing, separating, remixing and re-separating. The device can remove most of moisture in the oil shale and preheat the oil shale to about 80 DEG C without any loss of oleaginous materials in the oil shale. The device is energy-saving, can reduce the heat quantity required by an oil shale carbonization furnace by more than one third, and reduce the heat consumption by 60,000 to 80,000 kcal/ton of oil shale distillation.

Description

Technical field [0001] The invention is a device for preheating and drying oil shale by using waste flue gas, which is characterized in that it can remove more than 50% of the surface water of the oil shale without losing the oily substances in the oil shale. Background technique [0002] At present, domestic oil shale is not preheated and dried before entering the carbonization furnace. Oil shale contains a certain amount of water, generally about 10%, and some as high as 15%. A large part of the heat brought by the gas is used to evaporate water. Since the oil shale has not been preheated and dried, more than one-third of the heat supplied to the carbonization furnace is used to evaporate water. This not only results in a large amount of gas consumption, thickened gas pipelines, an increase in the volume of the drying section of the retort furnace, and increased equipment investment. At the same time, a large amount of water vapor enters the retort product, which increase...

AI Technical Summary

Problems solved by technology

This not only results in a large amount of gas consumption, thickened gas pipelines, increased volume of the drying section of the retort furnace, and increased equipment investment. At the same time, a large amount of water vapor enters the retort product, which increases the pressure on the recovery and oil-water separation systems. In addition, the heating furnace generates The temperature of the exhaust gas can reach above 400°C, and it is discharged without utilization, which also causes a great waste of heat energy

With the change of ambient temperature, the oil shale has a large temperature difference between winter and summer, resulting in unstable working conditions of the retort furnace, and the shale oil yield fluctuates accordingly. Some retort furnaces have an oil recovery rate of up to 65% in summer. In winter, sometimes the oil recovery rate drops below 40%, which greatly increases the cost and wastes a lot of resources

Images