Theoretical analysis and numerical verification of simplified mass transport model for multi-component gas

doi:10.16265/j.cnki.issn1003-3033.2024.10.0125

Abstract

Abstract:

In order to explicit the distribution characteristics of polluted gases in factory buildings and realize efficient control of industrial building environments, the study analyzed the differences and simplification conditions between the distribution characteristics of multiple gaseous pollutants and single gaseous pollutants, clarified the transportation characteristics of multi-component mixed gases emitted simultaneously from the same source, revealed the feasibility range and principles to be followed for mass transfer simplification of multi-component mixed gases in full scale, and verified the validity of the conclusion through numerical simulation. The results show that the applicable range of the multi-component gas mass transfer simplification model is as follows: when the mixed gas emitted from the same source has no phase change and chemical reaction, and its flow parameter Reynolds number Re is above 10³ and Mach number Ma < 0.3, and the physical property parameters are within the range of Knudsen number Kn < 0.01 and temperature between 0.3 Characteristic vibrational temperature θ_v and T', the components can be simplified for studying the distribution characteristics of pollutants. The simplified deviation stems from the difference in volume force per unit mass of the mixed gas before and after simplification (ΔF). When simplifying, it is necessary to ensure that the ratio of ΔF to the main driving force is less than 0.01. The theoretical model's application range and simplification principle agree with the simulation results. It is proved that a variety of gaseous pollutants can be simplified into a single type under the condition that the simplification principle is met within the applicable scope to explore the distribution characteristics of pollutants.

Key words: gaseous pollutants, multi-component gas, mass transfer simplification model, simplification principle, numerical simulation

CLC Number:

X962工业通风

CAO Yingxue, WANG Jinxiao, WANG Yi, HUANG Yanqiu, LI Haodong, MENG Xiaojing. Theoretical analysis and numerical verification of simplified mass transport model for multi-component gas[J]. China Safety Science Journal, 2024, 34(10): 124-133.

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序号	气体组分/%			温度/K	初速度/(m·s^-1)	R₁	R₂
1	HF:50	CO₂:5	He:5	300	10	0.000 6	0.118
2	HF:5	CO₂:20	He:2	300	5	0.002 19	0.313
3	HF:55	CO₂:35	He:5	800	1	1.12	0.26
4	HF:5	CO₂:40	He:50	800	0.1	290	0.47
5	SO₂:20	CO₂:5	He:70	800	0.5	643	0.897
6	HF:1	CO₂:1	He:95	300	0.5	0.612	0.093
7	SO₂:80	CO₂:5	He:5	800	0.5	0.117 8	0.008 94
8	SO₂:20	CO₂:30	He:45	800	0.5	16.79	1.031
9	SO₂:20	CO₂:30	He:45	300	0.5	6.295	75.15
10	SO₂:25	CO_2:22	He:48	300	0.5	6.934	411.12