生物质气化风机套管采暖系统非稳态模拟

Unsteady Simulation on Biomass Gasification Heating System with Fan & Double-Tube

针对装设防火墙导致我国北方生物质气化站存在湿式净化装置冬季防冻的问题,提出了一种基于风机套管的余热回收系统.采用商用CFD软件Fluent以及k-ε模型对采暖效果进行非稳态数值模拟,结果表明,当进气口空气流速分别为9 m/s(供暖90 min后),13 m/s(供暖40 min后)满足防冻要求,证明了技术的可行性;同时模拟了进气口空气流速分别为5,9,13 m/s在不同时刻的采暖效果,得出增大风机风量可提高采暖效果、缩短达到防冻要求所需时间以及使得净化间内温度分布更加均匀,但风机风量不可无限增加,需要考虑规范对风速的限制以及能耗的增加.

Aimed at solving the antifreezing problem of the wet purification device of biomass gasification station due to the installation of the firewall in winter time of north China,a waste- heat recovery system based on fan ＆ double-tube is proposed. The Fluent and k-s model is used to simulate the unsteady state of heating. The results indicate that the antifreezing requirement can be met in 90 or 40 min when the inlet air velocity is 9 or 13 m/s, respectively. Then the feasibility of the technique can be proved. The heating effects of different inlet air velocities of 5 , 9,13 m/s at different times are also simulated. It shows that the heating effect can be raised and the time needed to reach the antifreezing requirement can be shortened and the temperature distributed in purification room can be more even by increasing the fan air volume. But the air speed should be restricted according to the corresponding standard and the energy consumption considerations.