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Method for measuring flow parameter distribution in particle flow two-phase flow reactor

A technology for flow parameters and reactors, which is applied in fluid dynamics experiments, measuring devices, instruments, etc., can solve the problems of infeasibility of industrial reactors, difficult selection of sample space, and failure to consider the influence of cross-scale correlation on mesoscopic structure.

Inactive Publication Date: 2007-06-13
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This static, empirical estimation method is inherently unable to extrapolate from the original experimental conditions to industrial reactors
[0008] Existing works have only paid attention to the influence of substructure microscale on mesostructure (see reference 3: Agrawal, K., Loezos, P.N., Syamlal, M., Sundaresan, S.Journal of Fluid Mechanics.Vol.445, P .151.(2001)), trying to directly correlate the effect of complex mesoscopic structure on drag force from the calculation results of the sample micro-element space, without considering the influence of cross-scale correlation on mesoscopic structure
The sample space of the actual process is difficult to choose, and it is not feasible in the application of industrial reactors

Method used

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  • Method for measuring flow parameter distribution in particle flow two-phase flow reactor
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  • Method for measuring flow parameter distribution in particle flow two-phase flow reactor

Examples

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Effect test

Embodiment 1

[0108] Example 1 The method of the present invention is applied to the flow prediction in a rapid fluidized calciner of coal series kaolin with an annual output of 1000 tons. Raw material kaolin average particle size 0.002mm, particle density 800kg / m 3 , The inner diameter of the calcination furnace is 0.45m, and the height of the furnace is 10.5m. The furnace temperature is controlled at around 900°C. The main reactions that take place are: C+O 2 →CO 2 , Al 2 o 3 2SiO2 2 ·H 2 O→Al 2 o 3 2SiO2 2 . During the calculation, on the general platform provided by commercial CFD software, the drag coefficient calculated by the method of the present invention according to the calculation block diagram is compiled into an interface program to replace the internal method of the software. First, the geometric structure of the reaction device is 1:1, and the calculation method is the two-fluid model under the double Euler coordinates; secondly, the temperature is set and the pro...

Embodiment 2

[0109] Example 2 The method of the present invention is applied to the flow prediction in the circulating fluidized bed boiler of Wuhan Petrochemical Plant, which produces 75 tons of steam per hour, to assist in the detection of faults. As shown in Figure 3, the main section of the boiler furnace is 5.4×3.99m, the height of the furnace is about 22.5m, the average particle size of circulating ash particles in the furnace is 0.21mm, and the particle density is 2000kg / m 3 , the furnace temperature is controlled at about 900°C, and the designed primary air volume is 49701Nm 3 / h, secondary air volume 33134Nm 3 / h. The combustion reaction mainly occurs in the furnace: C+O 2 →CO 2 . On the general platform provided by commercial CFD software, the drag coefficient calculated by the method of the present invention is written as an external interface program in a user-defined form to replace the internal method of the software. During the calculation, firstly, the geometric struct...

Embodiment 3

[0110] Example 3 The method of the present invention is applied to the prediction of the flow field distribution in the new refinery multi-stage reactor of Sinopec to assist in the optimization design. The diameter of the main section of the reactor is 3.4m, the inlet gas velocity is 15m / s, the inlet solid volume is 1500t / h, the average particle size of the particles used is 0.075mm, and the particle density is 1300kg / m 3 , The operating temperature of the furnace is about 400°C. The drag coefficient calculated by the method of the present invention is written as an external interface program to replace the internal method of the commercialized software. In the calculation, firstly, the geometric structure of the reactor is 1:1, and the calculation method is the two-fluid model under the double Euler coordinates; secondly, the temperature is set, and the properties of particles and gases are set according to the actual physical property system; the apparent gas at the bottom i...

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Abstract

The invention discloses a method to testing flow parameters distribution in particle fluid two-phase flow reactor. It includes the following steps: according to the structure size and physical property, operation condition of reactor to gain speed and thickness distribution; gaining medium structure parameter; solving all the combination of variation root to seek the optimal root; calculating interlacing drag force and replacing drag force relationship of two-phase flow module to take iterative computation to gain the thickness, in random infinitesimal of reactor, and the space distribution and time evolution of speed flow field. The invention could gain drag coefficient reflecting actual situation and accurately calculate the flow, reacting, heat transferring and mass transferring process in reactor.

Description

technical field [0001] The invention relates to a particle fluid two-phase flow reactor, in particular to a method for measuring flow parameter distribution in the particle fluid two-phase flow reactor. Background technique [0002] Particulate-fluid two-phase flow exists widely in process industrial systems. With the change of physical and operating parameters, the two-phase flow presents complex structure and parameter distribution changes, which have direct, sometimes even orders of magnitude, pressure drop distribution, mass transfer, heat transfer efficiency and reaction conversion rate in industrial reactors. Impact. Therefore, how to accurately describe the flow structure and parameter distribution in the particle fluid two-phase flow reactor is an important task for the design, operation, control and scale-up of the process industry. The prediction method of interphase drag force of two-phase flow is one of the core contents to realize the goal of this work. [00...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M10/00
Inventor 王维葛蔚杨宁李静海
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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