Stratum granulosum filter of double-pass moving bed

Abstract

A dual-stroke moving-bed filter with particle layer for removing dust from high-temp and -pressure gas or fume is composed of a vertical cylindrical casing composed of top and bottom end covers and cylindrical body and with gas inlet and outlet tubes and filter inlet and outlet tubes, a gas collecting cylinder at upper area in casing and communicated with said filter inlet tube, a region dividing cylinder in said gas collecting cylinder, and a conic hopper of filter at lower area in casing. The dust contained gas and the filtering particles flow downward at first and then upward for higher effect to remove dust.

Description

Technical field [0001] The content of the invention belongs to the technical field of filtration and separation devices, and relates to a moving bed granular layer filter used for dedusting coal gas and flue gas under high temperature and high pressure. Background technique [0002] Integrated gasification combined cycle (IGCC) and pressurized fluidized bed combined cycle (PFBC-CC) are currently recognized clean coal power generation technologies that can better solve the two major problems of energy saving and environmental protection in coal-fired power generation systems. Filtration dust removal is considered to be one of the most promising and most promising high-temperature dust removal technologies for IGCC and PFBC-CC. The particle layer filter is a device that uses solid particles with very stable physical and chemical properties to form a filter layer to filter gas. It has the advantages of high temperature resistance and good durability. Through design improvements...

AI Technical Summary

Problems solved by technology

The form of cross flow is that the air flow direction is perpendicular to the moving direction of the particle layer, because it is not easy to form a stable dust particle deposition layer, so the filtration efficiency is low

The downstream form means that the air flow direction is the same as the moving direction of the particle layer, and it is easy to form a sedimentation layer of dust particles. The trapped dust particles are entrained and the dust particles are mixed back, which reduces the collection efficiency, and the bed form is also difficult to arrange

The countercurrent form is that the flow direction of the airflow is opposite to the movement direction of the particle layer. Generally, the dust-laden airflow flows from bottom to top, and the particle layer moves from top to bottom. The movement of the particle layer has little effect on the void ratio of the particle layer in the vertical airflow direction. The layer-deposited dust gradually decreases in the direction of the filtered gas flow. Before the gas leaves the particle layer, it always encounters a clean particle layer, so it is better to prevent the back-mixing and entrainment of the deposited dust. The flow form and co-current form are superior, but the prerequisite for gas / particle countercurrent operation is that the gas superficial filtration velocity is less than the fluidization velocity of the adjacent boundary, which limits the equipment output of the counterflow moving bed particle layer filter to a certain extent

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