Concentration distribution prediction model of water curtain diluted ammonia by considering water curtain liquid drop absorbing ammonia mass transfer

Abstract

The invention relates to a concentration distribution prediction model of water curtain diluted ammonia by considering water curtain liquid drop absorbing ammonia mass transfer. The mass transfer process between water curtain liquid drop and ammonia cloud cluster is researched based on a double-film mass transfer theory, a theoretical calculation equation of water curtain liquid drop absorbing ammonia is built, the liquid drop absorbing ammonia concentration R is built to represent the liquid drop absorbing effect, the square root of R is coupled into the smoke plume radius r on the basis thatthe parameter R is comprehensively assessed, and the concentration distribution prediction model of the water curtain diluted ammonia is built. The built concentration distribution prediction model is testified by adopting relevant experimental data, the model can accurately calculate the ground concentration of the ammonia leaked cloud cluster in the downwind direction at a natural spreading state and a forced spreading state respectively. The design method of water curtain diluted ammonia system projects is enriched, and the effect prediction errors of the water curtain diluted ammonia aredeclined. The result shows that the built prediction model can accurately predict the concentration of the water curtain diluted ammonia in the downwind direction, the deviation is within the range accepted by the project, and the prediction result is enabled to be reliable.

Description

Technical field [0001] The invention is used in chemical industry, fire protection and other industries, and relates to a water curtain dilution ammonia concentration distribution prediction model that considers the mass transfer of ammonia absorbed by water curtain droplets, and is mainly used in emergency plans and accident rescue guidance for liquid ammonia leakage accidents. Background technique [0002] As a commonly used industrial gas, ammonia is widely used in the chemical industry and food industry. It is often pressurized and stored in liquid form. These equipment (high-pressure vessels, storage tanks or pipelines, etc.) that store liquid ammonia may be damaged due to various reasons. Accidental rupture due to various reasons, such as corrosion, welding defects, poor sealing, valve damage or operating errors, can easily cause serious casualties and environmental hazards. As a measure to effectively dilute the leakage and spread of hazardous chemicals, water curtain...

AI Technical Summary

Problems solved by technology

Based on the semi-empirical formula to describe the interaction between the medium-water curtain-air, many models have been developed in recent decades, such as the widely used RED concentration distribution prediction model, which considers the momentum exchange and air entrainment effect, but does not consider the effect of droplet absorption on the dilution effect

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