Experimental and model research on chloride ion gas-solid distribution in the process of desulfurization wastewater evaporation.

In this paper, research on chloride ion gas-solid distribution in the process of desulfurization wastewater evaporation was carried out. The factor analysis of temperature, pH, and concentrations of Cl- Na+, Ca2+ and Mg2+ was explored by orthogonal experiments. Results show that the distribution coefficient increases with increasing temperature and Mg2+ concentration and decreasing pH, but decreases with increasing concentrations of Cl-, Ca2+ and Na+; The interaction and significance of each factor were compared and analyzed, and the order of influence significance on the chloride ion gas-solid distribution coefficient is listed as: temperature (0.781) > pH (0.611) > Cl- concentration (0.366 ) > Mg2+ concentration (0.211) > Ca2+ concentration (0.079) > Na+ concentration (0.03). A chloride ion gas-solid phase distribution coefficient model ranging from 180 °C to 380 °C was built based on phase equilibrium theory and state equations. The study clarifies the gas phase transformation mechanism of chloride ions, and achieves the quantification and prediction of chloride ion volatilization under different environmental and water quality parameters; an important theoretical and practical reference for the application of high temperature flue gas evaporation technology is provided through the research.

Clinical study on laparoscopic radical operation for rectal cancer after short-time preoperative radiotherapy / 中国普通外科杂志

Objective To explore the application and efficacy of laparoscopic radical operation for rectal cancer after preoperative short-time radiotherapy.Methods The clinical data of 108 patients with Dukes B and C rectal cancer were analyzed retrospectively.Thirty-five patients underwent laparoscopic radical operation after preoperative short-time radiotherapy,meanwhile 30 patients underwent laparoscopic radical operation,and 43 patients underwent open operation,both later groups without preoperative radiotherapy.Results There were not significant differences in preoperative general condition,tumor size and stage,pathological type,site of operation,and mode of operation between the 3 groups.But there was a higher rate of radical resection and sphincter preservation in the laparoscopic operation plus radiotherapy group than in the other groups(P