基于强化传质的节能型吸收稳定系统工艺流程分析

ANALYSIS OF ENERGY SAVING ABSORPTION-STABILIZATION SYSTEM BASED ON INTENSIFIED MASS TRANSFER

提出了一种设置解吸塔进料预热器、二级中间冷凝器、中间再沸器的强化传质与节能型吸收稳定系统的工艺流程,通过建立基准流程和节能流程的模拟模型,对工艺流程进行分析与评价。结果表明:通过设置进料预热器,可提高一级冷凝液相进入解吸塔的温位;通过将解吸气与一级冷凝气直接混合,可避免解吸气与吸收塔塔底油及压缩富气的混合,降低一级冷凝器负荷;节能流程可强化解吸塔的传质效率,合理降低吸收稳定系统的总公用工程负荷;相对于基准流程,节能流程的能耗可降低22.02%,解吸塔内的气相和液相负荷均有所降低,具有强化传质、优化节能、缓解塔内气液相负荷的优点。

This paper introduced a simulated process consisting of mass transfer intensified and energy-saving absorption-stabilization system, which involves a feed preheater for desorption tower, twostage condenser,and intermediate reboiler. The comparison of the simulated process with a basic process which only consists of a two stage-condenser and intermediate reboiler was conducted. It is found that the temperature of the first-stage condensed liquid phase entering the desorption tower is increased by feed preheater, and the duty of the first-stage condenser is decreased due to the direct mixing of desorbed gas with the gas from the first stage condenser instead of mixing of the desorbed gas with the bottom oil of the absorption tower and the compressed rich gas. Moreover, the mass transfer efficiency of desorption tower is improved and the overall utility consumption is reduced. Compared with the reference process, the energy consumption of the new process is reduced by 22.02 %. Gas and liquid loads in the desorption tower are both reduced. The new process has advantages of mass transfer intensification, energy saving and low-loads of gas-liquid phase in the desorption tower.