固定流化床反应器内气体分布方式的优化

Optimization of gas distribution in a fixed fluidized bed reactor

传统小型固定流化床反应器采用烧结板作为气体分布装置,利用中控螺栓将分布器压紧固定在流化床反应器底部。在较高的操作温度条件下,由于密封垫与反应器材质的不同而产生不同程度的膨胀,导致密封部分或者环隙出现气流短路的问题,造成流化状态的不稳定,导致部分催化剂未参与实际反应,影响了催化剂评价数据结果的准确性。为了解决这一难题,文中采用堆砌的不锈钢珠作为分散介质,利用规则不锈钢珠气阻小、易于安装和拆卸的特点,降低了密封要求。文中通过流化床冷模实验比较了烧结板气体分布器和规则填料气体分布器的阻力大小和流化状态,通过流化床热模比较了烧结板气体分布器和规则填料气体分布器的温度分布。实验表明本文的方法大大改善了流化床流化状态,获得了良好的固定流化床评价结果。

Traditional small-scale fixed fluidized bed reactor used sintered plate as a gas distribution device. The control bolt distributor was pressed and fixed at the bottom of the fluidized bed reactor. Under the condition of high operation temperature, due to the different sealing pad and reactor materials varying degrees of expansion, leaded to seal or part of ring gap appearing the problem of short circuit of the air flow, the fluidized state being unstable, a portion of the catalyst being not participate in the actual reaction, and the data of the catalyst the accuracy evaluation being affected. In order to solve this problem, a pile of stainless steel beads were adopted as the dispersion medium, because rules stainless steel beads gas resistance was small, easy mounting and dismounting, and reduced the sealing requirements. The sintering plate gas distributor and regular packing gas distributor were compared with the size of the resistance and flow state by fluidized bed cold model experiment, and the temperature distribution by the fluidized bed heat model. The results show that this method greatly improves the fluidized bed fluidized state, the good fixed fluidized bed evaluation results are obtained.