Method and system for measuring solid circulation flow rate of thermal-state circulating fluidized bed

Abstract

The invention provides a method and a system for measuring the solid circulation flow rate of a thermal-state circulating fluidized bed. The measuring method comprises the following steps that: a target pressure difference between a first pressure measuring point and a second pressure measuring point is acquired, wherein the first pressure measuring point and the second pressure measuring point are arranged in a lifting pipe or a hearth lean-phase region of a circulating fluidized bed, and the distance between the first pressure measuring point and the second pressure measuring point is delta h; a pre-established fitting curve of the pressure difference and the solid circulation flow rate is determined; and the solid circulation flow rate corresponding to the target pressure difference is predicted based on the fitting curve of the pressure difference and the solid circulation flow rate. The solid circulation flow rate of the thermal-state circulating fluidized bed can be reliably measured, measurement facilities are simple, a material measurement section does not need to be additionally arranged, the cost is low, the solid circulation flow rate is represented by directly utilizing the pressure difference, and the normal operation state of the circulating fluidized bed is not interfered.

Description

technical field [0001] The present application relates to the technical field of circulating fluidized beds, in particular to a method and system for measuring the circulating flow rate of solids in a hot circulating fluidized bed. Background technique [0002] Circulating fluidized bed is an efficient reaction device for heat and mass transfer, which is widely used in energy, electricity, chemical and metallurgical industries. Moreover, the circulating fluidized bed combustion technology has many advantages such as wide adaptability to coal types, strong load adjustment capability, and low pollutant emissions, and is internationally recognized as one of the best commercialized clean coal combustion technologies. [0003] The solid circulating flow rate is an important technical parameter of the circulating fluidized bed, and its size is an important index to judge the gas-solid flow state in the riser or furnace. Only when the circulating flow rate reaches the saturation ca...

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Problems solved by technology

However, the current method for measuring the circulating fluidized flow rate of solids is limited to cold circulating fluidized bed systems, and cannot adapt to the high temperature environment of hot circulating fluidized bed reactors and circulating fluidized bed boilers.

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