Sealed material returning valve with two-way material returning control function

Abstract

The invention discloses a sealed material returning valve with a two-way material returning control function for a circulating fluidized bed. Ascending sections (2) which are positioned on the upper part of the sealed material returning valve are respectively arranged on two sides of a descending section (1); every two sections are separated through a separation plate; at least one overflow port (21) is formed in the top side wall of each ascending section (2); each overflow port (21) is connected with a material returning section (3); an air chamber (4) of an air distribution device is formed in the lower part of the sealed material returning valve and is provided with an air-cap-type air distribution plate (45); the lower part of the air distribution plate is partitioned into n independent air chambers (42) through separation plates; each independent air chamber (42) is connected with an air pipe (43) capable of independently controlling opening / closing and air quantity. By virtue of the sealed material returning valve, two-way material returning can be realized, and the material returning quantity of two sides is controlled in a certain range. The sealed material returning valve can be applied to double-fluidized-bed device systems, chemical chain combustion device systems and the like.

Description

technical field [0001] The invention relates to a sealed material return valve capable of bidirectionally controlling material return, which belongs to the intersection field of energy technology and mechanical engineering technology. Background technique [0002] The combustion chamber, separation device and solid material return device are the main components of the circulating fluidized bed boiler that are different from other types of boilers. The basic task of the return device is to stably send the high-temperature solid particles separated by the separator back to the combustion chamber with higher pressure , and prevent the gas from entering the separator. [0003] General flow control devices can be divided into two categories: mechanical valves and non-mechanical valves. The non-mechanical valve does not need any external mechanical force, and only uses gas to push the solid particles to move, so as to realize simple and reliable conveying of solid materials under...

AI Technical Summary

Problems solved by technology

However, when there are two parallel fluidized bed reactors in the system, such as in the chemical looping combustion process or the gasification-combustion polygeneration process, it is necessary to distribute the circulating materials between the two reactors. It is required that the return valve can return materials in both directions at the same time, and the proportion of each direction is controllable within a certain range. Conventional sealed return valves cannot meet this requirement

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