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Study on Separation Efficiency of Dehydration Equipment with Corrugated Plates

The complex problem on two-phase flow field in the dehydration equipment with corrugated plates is presented in the paper. The influence factors on dehydration effect were found by the numerical analysis on the gas-liquid two-phase flow field and droplets’ mechanical behavior in the dehydration equipment with corrugated plates while changing the structure parameters and operating conditions. Experiment on the separation efficiency and limit gas speed of dehydration equipment was carried out by changing the plate spacing, droplets diameter and spraying water flow. The results show that the dehydration equipment has the highest dehydration efficiency and minimum resistance loss when the distance between the plate is 15 mm, the droplets’ average diameter is 160 μm, and the spraying water flow is 0.89 m 3 /h. While the limit gas speed is affected by the plate spacing, droplets diameter and spraying water flow. The optimal limit gas speed is 3.7 m/s considering the correlative factors of dehydration efficiency and resistance loss comprehensively. The numerical simulation results agree well with the experimental results. It provides a guide for the industrial design of the dehydration equipment with corrugated plates. Introduction Natural gas, coal gas and other gas fuels are used more and more widely in industry. However, moisture in gas fuels will directly affect its combustion efficiency[1-3]. Gas dehydration technology plays an important part in the utilization of gas fuels[4-6]. Moisture in natural gas not only reduces the calorific value of the gas, but also dissolves acidic gases such as H2S which causes serious corrosion of the gas service equipment[7]. Therefore, natural gas must be dehydrated before it can be transported and utilized. Blast furnace, converter and coke oven gas are important energy in the iron and steel enterprises. Many enterprises use combined cycle power plant (CCPP) generation technology to make use of them. However, water in the gas will have many problems in CCPP. Firstly, acidic substances are easily dissolved in the gas containing mechanical water. They will make the coating of gas turbine blades corroded and cause the blades to crack and break[8]. It will seriously affect the service life of gas turbine. Secondly, the mechanical water will vaporize while the gas is burning. It will consume a part of calorific value of the gas and reduce its thermal efficiency. Finally, the mechanical water in the gas contains phenol, tar and other components, which will condensate and discharge during the transportation process and cause environmental pollution. Therefore, the mechanical water content in the gas entering the CCPP must be less than 5mg/m 3 . At present, there are many dehydration technologies used for gas fuel, such as wire mesh and cyclone dehydration device. They can’t meet the requirements of industrial application the operation because the dehydration efficiency is very low and the energy consumption is very high. The corrugated plates dehydration device can efficiently remove the mechanical water in the gas and has little resistance loss[9-11]. However, its dehydration efficiency and resistance are greatly affected by the operation conditions[12,13]. The optimum structure parameter and limit gas speed are found from the experiment which can give a guidance for the industrial application.