Fluidized bed low-temperature destructive distillation system and low-temperature destructive distillation method of low-rank coal

Abstract

The invention provides a fluidized bed low-temperature destructive distillation system and a low-temperature destructive distillation method of low-rank coal. According to the method, a mixed gas of hot coal gas produced by a gasification furnace and circulation cold coal gas is adopted as a hot carrier and a fluidizing gas of a destructive distillation reaction. A hydrogen atmosphere of coal gas can provide a partial hydrogenation effect, such that obtained tar has the advantages of high light component content, good quality, high thermal efficiency, and high yield. Also, with the method, a two-stage low-temperature destructive distillation reactor is adopted, such that the retention time of solid particles in the reactor is increased, destructive distillation effect is improved, high solid content in the bed can be maintained, and operation stability can be maintained. The invention also provides a low-temperature destructive distillation reactor. The low-temperature destructive distillation reactor is the two-stage low-temperature destructive distillation reactor, such that the retention time of solid particles in the reactor is increased, and destructive distillation effect is improved. With the two-stage low-temperature destructive distillation reactor, high solid content in the bed can be maintained, and operation stability can be maintained.

Description

technical field

[0001] The invention relates to the technical field of energy and chemical industry, more specifically, to a fluidized bed low-temperature dry distillation system and a low-rank coal low-temperature dry distillation method. Background technique

[0002] The characteristics of my country's resource structure rich in coal and low in oil determine the dominant position of coal in energy consumption. Realizing the efficient and clean utilization of coal is of great importance to solve my country's coal-burning pollution, oil shortage, and realize the overall optimization and sustainable development of resources, energy and the environment. significance. Coal is a complex substance composed of C, H, O and other elements. Its main structure is a polymerized macromolecular aromatic ring, and a certain amount of small molecular hydrocarbon compounds and heterocyclic compounds are dispersed in the main structure. During the low-temperature dry distillation process, lo...

Images