Double-way controllable material returning valve for circulating fluidized bed boiler

Abstract

The invention discloses a double-way controllable material returning valve for a circulating fluidized bed boiler, belongs to a material returning device of a circulating fluidized bed boiler and in particular relates to a flow rate regulating device. According to the double-way controllable material returning valve, a partition plate is arranged in a material charging pipe of the material returning valve, the lower part of the material charging pipe is partitioned into two parts, each of the two parts is connected with a moving filling bed, the moving filling beds are respectively connected with two material returning beds, material returning pipes are connected behind the material returning beds, and air distribution systems are respectively arranged on the lower parts of the moving filling beds and the material returning beds. The material returning valve has two loops, so that materials are charged at a single point and returned at a plurality of points; and according to a flow rate controlling principle of the material returning valve, pressure of the material charging pipe on two sides of the partition plate is changed by regulating the volume of flexible air on the lower parts of the two moving filling beds, so that a material charging ratio in which materials on the upper part of the material charging pipe are charged into two sides of the lower part of the partition plate is regulated, and the material flow rates at two material returning points are regulated. By the material returning valve, the materials can be uniformly charged into a hearth, so that the material returning uniformity of hot materials in cross sections of the beds of the large-scale circulating fluidized bed boiler is greatly increased.

Description

technical field [0001] The invention relates to a controllable device for a return valve of a circulating fluidized bed boiler, which belongs to the return device of a circulating fluidized bed boiler. Background technique [0002] Circulating fluidized bed boiler technology is a high-efficiency, low-pollution and clean combustion technology that has developed rapidly in the past ten years. Internationally, this technology has been widely used commercially in the fields of power station boilers, industrial boilers and waste treatment and utilization, and is developing towards large-scale circulating fluidized bed boilers with a scale of hundreds of thousands of kilowatts; domestic research and development in this area And applications are also gradually emerging, and hundreds of circulating fluidized bed boilers have been put into operation or are being manufactured. Therefore, it is of great significance to improve the efficiency of circulating fluidized bed boilers. [0...

AI Technical Summary

Problems solved by technology

[0006] In view of the above situation, the present invention provides a dual-channel controllable return valve device for circulating fluidized bed boilers, which can control the flow rate of materials between each return point while realizing single-point feeding and multi-point return. distribution, so as to optimize the material distribution performance and better solve the problem of uneven material distribution in the furnace

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