With the increasing population, there is more and more household garbage. Nowadays, the main way to deal with this huge amount of household garbage is incineration and landfill, especially incineration. Incineration is not a permanent solution, however. Many chlorine-containing PVC plastic and kitchen waste emit hydrogen chloride gas when burned. If these hydrogen chloride gases are discharged directly into the air without treatment, it will have a great impact on human health and the natural environment. To that end, scientists have devised ways to deal with hydrogen chloride, a gas produced in incinerator exhaust.

The purpose of this study was to investigate the feasibility of ammonia injection for removing hydrochloric acid gas from incineration exhaust gas. Ammonia injection is a dry air pollution control method, which can not only reduce the initial cost and operation cost, but also avoid the waste water treatment problem caused by wet method, and prevent the corrosion of incineration equipment caused by hydrogen chloride gas in low temperature condensation. In addition, because it is directly injected ammonia gas, no other acid gas removal device is required, thus saving space requirements. Direct injection of ammonia in the incineration system, can direct response generated ammonium chloride and hydrogen chloride gas in the incineration flue gas particles, thus to ammonia removal of hydrogen chloride gas injection method is feasible or not, depends on the removal efficiency of high and low, and whether the ammonium chloride generated by solid particle size can be set with incineration ash dust collection equipment. A mathematical model was first developed to investigate the removal efficiency of hydrochloric acid gas and the size of ammonium chloride particles under different incineration conditions by ammonia gas. A thermodynamic equilibrium model was used to estimate the relationship between the removal efficiency of hydrochloric acid gas with temperature and intake concentration. In addition, the Particle size of the product is simulated by using the gas-to-solid Particle Formation Model to simulate the Particle Formation process under various operating conditions. The removal rate of hydrogen chloride was studied by experiments. Model it is found that when the operating temperature is under 120 oc, and ammonia and hydrogen chloride injection ratio of 1:1, ammonia injection method can effectively remove HCL gas, to meet the discharge standard, and in the appropriate operating conditions, product particles can be condensation on the existing of fly ash, increase the average particle size of fly ash, this will be good for dust collection equipment. The effects of residence time, temperature, intake gas concentration and the ratio of Mmol concentration of NH3/HCl injection on the removal efficiency of hydrogen chloride were preliminarily completed. The experimental results show that the hydrogen chloride removal efficiency can be predicted by the model with the same variation trend.