公开(公告)号：US09777431B1

公开(公告)日：2017-10-03

申请号：US15587077

申请日：2017-05-04

Applicant: GuangXi Bossco Environmental Protection Technology Co., LTD

Inventor： Shuangfei Wang ,  Shuangxi Nie ,  Chengrong Qin ,  Xueping Song ,  Haichuan Zhang ,  Kun Zhang

IPC: D21C9/14 ,  D21C9/16 ,  D21C11/06

CPC classification number: D21C9/14 ,  D21C9/1036 ,  D21C9/16 ,  D21C9/166 ,  D21C11/06 ,  Y02P70/24

Abstract: An excess heat recovery apparatus and process for high temperature chlorine dioxide bleaching of pulp is provided. The pulp of the high temperature chlorine dioxide bleaching stage enters a tube-side of a chlorine dioxide preheater through a pipeline. The low-temperature chlorine dioxide in the storage tank enters a shell-side pipeline of the chlorine dioxide preheater. 0.5 mol/L of a stabilizer may be added during preheating to prevent ClO2 from decomposing during the heating process. Preheated chlorine dioxide is then moved into a pulp mixer and the pH is adjusted to 3.2-3.8. The mixed pulp is then moved into a high temperature chlorine dioxide bleaching tower for bleaching. The cooling pulp, now out of the preheater, is washed in an alkaline extraction stage. The waste water from the washing flows directly into an effluent treatment system and is recycled after treatment.