Polyaluminum Chloride to reduce the moisture content of the sludge method Poly aluminum chloride to implement the standard urban processing plant produces a large number of sludge every day, due to the high water content (up to 80%), bulky, easily rotten stink Its difficult to handle.With the municipal sludge and industrial sludge production increased year by year, many EU countries have formulated and implemented the relevant environmental laws and regulations, prohibited the biodegradable organic matter containing sludge for landfill, to encourage their incineration. Guidelines for the Best and Possible Technical Guidance for Prevention and Control of Sludge Disposal in Municipal Sewage Treatment Plants (Trial) (2010) and Guidelines for the Best Available Techniques for Sludge Treatment and Disposal of Sewage Treatment Plants (Draft for Comment) 2008) clarified sludge incineration as one of the best feasible technologies for sludge treatment and disposal in China. This method is a sludge disposal technology with the advantages of reduction, harmlessness, resource recovery and energy recovery, etc. However, At present, all kinds of mechanical dewatering sludge moisture content is relatively high, resulting in sludge mixing difficult to implement.Polymeric aluminum chloride solution in order to effectively dewater the sludge, often used Sludge pretreatment and chemical conditioning method for chemical conditioning method because of simple, low cost, the effect has become the most commonly used method, of which commonly used chemical agents include inorganic coagulants (such as FeCl3, CaO, AlCl3, etc., added in an amount of 5% to 20% of the volume of the sludge dry solids), organic polymer coagulants (PAM, etc., added in an amount of 0.1% to 0.3% of the sludge dry solids), and microbial coagulation Etc. Since single chemical conditioner is often difficult to dehydration sludge to achieve the desired effect, in recent years, domestic and foreign scholars try to use a combination of conditioning agents or a variety of conditioning agents used to improve the sludge dewatering performance, which, The most common is CaO and iron salt, aluminum salt mating use shows that the application of conditioning agent can effectively reduce the moisture content of sludge, which means that the future of sludge treatment for the most of the dewatered sludge.Polychlorination Aluminum phosphorus removal China's "12th Five-Year Plan" requires that the sludge water content of urban sewage treatment plants must be less than 60% for the purpose of outward transportation, which will inevitably lead to the addition of a large amount of conditioners to meet this requirement. However, the addition of conditioners to varying degrees influences Sludge thermochemical properties Xu et al. Found that the addition of CaO in sludge can fix CO2 and increase the yield of H2. Vriginie et al. Added ferric salt to sludge pyrolysis and found it has catalysis. Folgueras et al. It shows that the different conditioning agents will change the content of mineral elements and their existing forms to some extent.However, there are few reports about the thermo-chemical conversion behavior of the conditioning agent during the incineration of sludge after deep dehydration.However, Composition, concentration and aggregation state (gas phase g and solid phase s) .Chemical thermodynamics in the chemical equilibrium complex system commonly used is the equilibrium constant method and Gibbs minimum free energy method. Gibbs free energy minimum method is the oldest chemical Balance and balance the same time solving the calculation method, the biggest drawback of this method is that convergence is not high, the initial value of strict requirements.So there is no common complexity of the calculation of the system, the preparation of a system for the calculation of the program, very Difficult to apply to the calculation of another system.Currently, the commercial thermodynamic software package used to simulate the migration and transformation of trace elements in coal combustion process are: NASA-CEA FACT, MTDATA, MINGT-SYS, SOLGASM IX, STANJAN, ALEXE, GEMINI etc. Frandsen et al (2002) compared 4 different thermodynamic software packages of MINGYS, NASA-CET89, FACT and SOLGASMIX, The differences in the outputs of the four software packages for Cd, Cr, Ni and Pb may be due to different data processing techniques used by different thermodynamic software packages, different convergence criteria or thermodynamic data .Yan et al. Evaluated the features and ranges of SOLGASMIX, ALEX and GEMINI software packages that are effective in computing simple thermodynamic systems, whereas for complex systems with multiple elements (eg, more than 20 elements), Need to enter the database manually, difficult to converge at low temperature, leading to difficulties in solving; ALEX data on the major and minor elements is very full, the lack of trace elements on the data.Frandsen introduced the GFEDBASE (Gibbs FreeEnergy DataBASE) database, in which Contains 33 kinds of trace elements, about 800 kinds of chemical forms of thermodynamic data. ALEX own database includes 30 times the amount of Elemental and trace elements of 600 kinds of pure condensed phase, liquid phase, gas phase and solid phase thermodynamic data.FACT system comes with 6000 kinds of inorganic material components of the thermodynamic properties of the database FACTBASE, complete data, powerful.