Oil washing and energy saving technology and device for condensing and recycling destructive distillation oil and gas of oil shale

Abstract

The invention discloses an oil washing and energy saving technology and a device for condensing and recycling destructive distillation oil and gas of oil shale. The technology is characterized in that high-temperature raw coal gas from a destructive distillation workshop directly enters an oil washing fractionation tower without cooling to separate and recycle heavy oil, shale oil and naphtha; the coal gas and light oil go out of a tower top and then enter a water washing tower; middle section circulation is set at the upper part of the tower for recycling heat; the light oil is cooled with recycled water in the water washing tower; and a part of the light oil circularly enters the oil washing fractionation tower to be used as cooling washing oil. By using the destructive distillation oil and gas of the condensed oil shale, the yield and the quality of shale oil are enhanced; and meanwhile, most of high-temperature heat is recycled and the wastewater quantity is reduced.

Description

technical field [0001] The invention relates to an oil washing energy-saving process and device for oil shale retort oil gas condensation recovery. Background technique [0002] Oil shale retort oil and gas are mainly in the vapor phase, which needs to be condensed to recover shale oil and other products. Due to the different oil shale carbonization process, the composition of the oil gas at the outlet of the carbonization furnace is different. [0003] Fushun Furnace Condensation Recovery System The temperature of the oil gas at the furnace outlet is about 90-110°C, and the oil gas contains dust. The oil-gas dust is removed by rinsing with circulating water in the collecting pipe, and the temperature drops to 80-90°C. The dedusted gas enters the scrubbing and saturation tower (the scrubbing tower is placed above the main air saturation tower) and is cooled to about 76°C, and the shale oil taken out by the cooling of the washing water accounts for about 60% of the total oil...

AI Technical Summary

Problems solved by technology

[0008] At present, the condensate recovery system in the oil shale retort process operating in Fushun in China adopts a water washing process, which is mature, but has the disadvantages of large energy consumption, large circulating water volume, and large amount of wastewater generated; the condensate recovery of foreign oil shale retort processes Some systems also use the oil washing process, but the comprehensive utilization of energy is not optimal

At present, the domestic oil shale retort oil washing technology is not yet mature. Therefore, it is necessary to research and develop oil shale retort oil gas oil washing energy-saving technology and equipment.

Images