External heat radiation regenerative oil shale dry distillation furnace

Abstract

The invention relates to an external heat radiation regenerative oil shale dry distillation furnace. The furnace is provided with a plurality rows of alternately arranged dry distillation chambers and combustion chambers; each row of combustion chambers is formed by a plurality layers of independent combustion channels; heat generated by combustion is transferred to oil shale in the dry distillation chambers with heat radiation and heat conduction manners with lattice-wall-structured heat conduction walls. With a gasification section, a cooling section, cooling water jackets and steam nozzle devices on the lower part of the dry distillation furnace, carbon residue in semicoke can be fully recycled, and semicoke and ash residual heat can be recycled. Water gas generated by the reaction of semicoke and steam is used as a medium for bringing out oil shale pyrolysis oil gas, such that outlet gas amount is low, dry distillation gas purity is high, and dry distillation gas heat value is high. The daily processing capacity of the dry distillation furnace can by higher tan 500t, and an oil yield can be higher than 90%. Water and electricity consumptions are low, and an auxiliary recovery system is small. With existing external heat dry distillation technologies, semicoke carbon residue cannot be utilized, thermal efficiency is low, maintenance is difficult, and yield is low. With the dry distillation furnace, the above problems are solved. The dry distillation furnace is especially suitable for water-deficient areas.

Description

technical field [0001] The invention relates to an external heat radiation regenerative oil shale retort furnace, specifically a retort furnace for retorting oil shale by using external heat radiation heating technology and regenerative combustion technology, which belongs to oil shale Dry distillation refining field. Background technique [0002] At present, there are mainly three oil shale dry distillation refining technologies widely used in China. The first is the Fushun oil shale retort furnace, the upper half is the retort section, and the lower half is the gasification section; the recirculating retort gas enters from the middle of the retort furnace, and burns with semi-coke in the gasification section to produce high-temperature flue gas The shale in the retort section is heated together, and the processing capacity of a single furnace is 100t / day, the processing particle size is 12-75mm, and the oil yield is about 75%. The second type is a full-circulation retort...

AI Technical Summary

Problems solved by technology

However, the difficulty of the external heating dry distillation process is that it is difficult to ensure the effective transfer of heat in the furnace.

From the 1920s to the 1960s, the external heating furnaces that were once popular in foreign countries were all shut down due to low thermal efficiency and difficulty in scaling up the furnace.

In recent years, there have been some patents on the external heating oil shale carbonization process proposed in China. Although the thermal efficiency and output of the carbonization furnace have been improved, they cannot recycle the latent heat of the semi-coke (that is, the residual carbon in the semi-coke, also known as fixed carbon dioxide). carbon) and semi-coke sensible heat, and the semi-coke is discharged directly after being released from the furnace, resulting in waste of resources and environmental pollution

Some retort furnaces also use a regenerator inside the furnace (near the flue of the combustion chamber), which will cause difficult maintenance problems and the hidden danger of gas leakage

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