均相电渗析膜堆淡化性能测试与分析

Homogeneous electrodialysis desalination performance test and analysis

为了进行均相电渗析测试分析以及设计选型需要,采用国产均相电渗析TRHE-JACM-5W-12060/100膜堆,通过装配自控式中试实验机,测试不同盐、不同电流及电压、不同流速状态下的单程脱盐率,计算出相应的电流效率及吨水能耗,并得出了膜堆的脱盐基本规律.低浓度淡化均相电渗析膜堆的单程脱盐率随着进水盐含量的降低而升高;随着电流密度的增加而升高;随着膜表面流速的降低而升高;与进水盐种类也有关,基本的脱盐率大小规律为:NaCl>Na_2SO_4>(NH_4)_2SO_4>NaCl+Na_2SO_4>NaCl+MgSO_4>NH_4Cl>NaHCO_3>MgSO_4.以3 000 mg/L的NaCl为原料液,膜表面流速为4 cm/s,平均每对跨膜电压为0.5 V时,电流密度可以达到0.5 A/m^2,单程脱盐率可以达到32%,本体直流能耗为0.23 kW·h/m^3;当平均每对跨膜电压为0.8 V时,单程脱盐率可以达到55%,本体直流能耗为0.7 kW·h/m^3.

Through self-control type pilot testing machine, test different salt, current, voltage, one-way desalination rate under different velocity state of homogeneous electrodialysis membrane-TRPE-JACM-5W-12060/100, calculate the corresponding tons of water current efficiency and energy consumption and obtain the desalting basic law of the film. The single stage desalination rate of low concentration desalination homogeneous electrodialysis membrane heap increases with the decrease of the influent salt content, and increases with the increase of the current density;with the decrease of flow rate of membrane surface, the basic desalination rate is NaCl>Na2SO4>(NH4)2SO4>NaCl+Na2SO4>NaCl+MgSO4>NH4Cl>NaHCO3>MgSO4. In the NaCl of 3 000 mg/L, the flow rate of the membrane surface is 4 cm/s, and the average voltage of each pair of transmembrane is 0.5 V, the current density can reach 0.5 A/m2, the single pass desalination rate can reach 32%, the energy consumption of the noumenon DC is 0.23 kW·h/m3;and when the average cross membrane voltage is 0.8 V, the single path desalination rate can reach 55%, and the energy consumption of the noumenon DC is 0.7 kW·h/m3.