Method for measuring mass flow rate of solid particle in circulating fluidized bed lifting pipe

Abstract

The invention relates to a method for measuring mass flow rate of solid particles in a circulating fluidized bed lifting pipe and belongs to the petrochemical field. The method not only does not need to change the structure of a circulating fluidized bed, but also does not need to add any part, only pressure sensors are arranged at proper positions of a horizontal pipe I of a T-shaped elbow at the outlet of a catalytic cracking device lifting pipe and the lifting pipe G to obtain two measuring point pressure drop delta p, and then the particle mass flow rate G<s> of the lifting pipe is obtained through calculation by using lifting pipe gas speed U<g>. The method for measuring mass flow rate of solid particles in the circulating fluidized bed lifting pipe has higher anti-interference performance and time following performance, has the advantages that the measurement is convenient and quick to conduct, the feed of the lifting pipe and the materials in a circulating loop are not interrupted, the method is easy to realize in the existing traditional circulating fluidized bed system and the like, and is particularly applicable to real-time detection and control of the mass flow rate of the solid particles in the lifting pipe with a T-shaped outlet structure in a catalytic cracking device.

Description

technical field [0001] The invention relates to petrochemical gas-solid riser reactors, circulating fluidized beds, and the field of pneumatic transport of particles, in particular to a method for measuring the mass flow rate of solid particles. Background technique [0002] The riser reactor is an important gas-solid two-phase upward reaction device in a circulating fluidized bed. Especially in petroleum refining and coal gasification units, it is a key reactor. In the riser reactor, the mass flow rate of solid particles G s , also known as the circulation rate, is an important parameter that determines the gas-solid reaction process in industrial production. [0003] In industrial production, the particle mass flow rate G in the riser s Difficult to measure directly and accurately. Conventional measurement methods for the mass flow rate of solid particles include: direct observation method, butterfly valve measurement method, companion bed method, etc. However, due to...

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Problems solved by technology

For example, Chinese patent 200810117401.X, titled "Measurement Method and Device for Circulating Fluidized Bed Material Circulation Flow Rate", the method adopts a flap valve, timer linkage switch, timer, material metering section, butterfly valve and Buffer tanks and other components are used to measure the mass flow rate of solid particles on the return riser. This method is only suitable for occasions where the material flow is allowed to be temporarily interrupted, and it affects the system pressure balance, so it is greatly limited

Chinese patent 200820200445.4, entitled "A device for measuring circulating flow rate applied to circulating fluidized bed" and Chinese patent 200810198396.X, entitled "A device and method for measuring circulating flow rate applied to circulating fluidized bed" , the method adopts the method of setting a partition in the upper section of the downcomer, and the particles flow to different metering storage tanks through the direction change of the partition, forming a set of switchable circulating fluidized bed particle circulation flow rate measurement device and method, but due to the increase of internal components, it is also necessary to temporarily interrupt the material flow, which will have a certain impact on the particle circulation in the circulating fluidized bed

In fact, according to "Principles of Fluidization Engineering" by Jin Yong et al., during the upward movement of solid phase particles carried by the gas phase in the riser of the circulating fluidized bed, the velocities of the gas phase and the solid phase are always inconsistent, and there is slippage , so the error caused by such an assumption is relatively large

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