热泵错流多效蒸发系统的模型与模拟

Modeling and Simulation of Cross Flow Multi- effect Evaporation System with Heat Pump

为了降低错流多效蒸发过程的能耗,将蒸汽喷射式热泵技术运用到错流多效蒸发系统中,并将系统中的物料衡算、热量衡算方程组用矩阵方程的形式描述,使所建立的热泵错流多效蒸发模型具有较强的通用性。用收敛速度快、稳定性好的迭代法结合矩阵法模拟求解热泵错流四效蒸发模型,结果表明。蒸汽喷射式热泵技术具有较明显的节能效果,热泵的喷射系数越大,或热泵的抽汽位置越往后效,节省的生蒸汽消耗量越大,节能效果越好,但同时蒸发器的传热面积也越大,存在最佳的热泵喷射系数和最佳的热泵抽汽位置。

In order to reduce the energy consumption of crossflow multi - effect evaporation process, steam jet heat pump technology is applied to the cross flow multi - effect evaporation system. Equations of material balance and energy balance of the system are expressed in the form of matrix equation so that the model of cross flow multi - effect evaporation with heat pump has strong versatility. Iteration method combined with matrix method is used to simulate and solve the quadruple effect cross -flow evaporation sys- tem. This algorithm has some advantages of good stability and quick convergence speed. The result indicates that steam jet heat pump technology has obvious energy saving effect. The larger injection coefficient or more backward extraction location of heat pump is set, the more fresh steam consumption is saved and the better energy saving effect is obtained. At the same time, the heat transfer area of evaporator is larger. So, there exist optimal injection coefficient and extraction location of heat pump.