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He C.,China University of Petroleum - Beijing | Feng X.,China University of Petroleum - Beijing | Chu K.H.,Honeychem | Li A.,Liaoning Datang International Fuxin Coal To SNG Co. | And 2 more authors.
Chinese Journal of Chemical Engineering | Year: 2014

We have developed a process model to simulate the behavior of an industrial-scale pressurized Lurgi fixed-bed coal gasifier using Aspen Plus and General Algebraic Modeling System (GAMS). Reaction characteristics in the fixed-bed gasifier comprising four sequential reaction zones - drying, pyrolysis, combustion and gasification are respectively modeled. A non-linear programming (NLP) model is developed for the pyrolysis zone to estimate the products composition which includes char, coal gases and distillable liquids. A four-stage model with restricted equilibrium temperature is used to study the thermodynamic equilibrium characteristics and calculate the composition of syngas in the combustion and gasification zones. The thermodynamic analysis shows that the exergetic efficiency of the fixed-bed gasifier is mainly determined by the oxygen/coal ratio. The exergetic efficiency of the process will reach an optimum value of 78.3% when the oxygen/coal and steam/coal mass ratios are 0.14 and 0.80, respectively. © 2014 Chemical Industry and Engineering Society of China (CIESC) and Chemical Industry Press (CIP).

Li A.-X.,Liaoning Datang International Fuxin Coal To SNG Co. | Jiang C.-X.,Liaoning Datang International Fuxin Coal To SNG Co. | Liu Y.-J.,Liaoning Datang International Fuxin Coal To SNG Co. | Shi F.-F.,SEDIN Engineering Co. | And 2 more authors.
Xiandai Huagong/Modern Chemical Industry | Year: 2012

The paper analyzes the characteristic of the supply chain, which involve "Coal Mine-To-SNG (synergy natural gas) Plant-To-Urban Users", and summarizes the two important contradictions of the supply chain, which contain the contradiction between the malconformation of gas consumption and the requirement of stable operation in coal chemical industry, the other contradiction between the unremittance of gas supply and the stable operation of equipment in coal chemical industry. In order to resolve the contradictions and ensure the safety and stability of the natural gas supply for the urban users, the problems which should be pay attention to are proposed when the Coal-To-SNG Plant is designed, which include the stable coal resource to ensure the plant's requirement, reliable technology to ensure the operation, serial equipments to reduce influence of suspend production, localizable equipment to ensure quick maintenance, the system with enough gas storage to deal with the failure of plant, matching the times to compliant law-abiding and keep advancements. Based on the study results, the author describes a design example of modern Coal-To-SNG plant for the city town users, which can produce 40×108 Nm3 SNG per year. The result of the study can be used in other Coal-To-SNG Plants under construction or proposed in china.

Li X.-Y.,Liaoning Datang International Fuxin Coal To SNG Co. | Wei D.-Q.,Liaoning Datang International Fuxin Coal To SNG Co.
Xiandai Huagong/Modern Chemical Industry | Year: 2015

The wastewater of coal gasification contains lots of phenolic compounds. The analysis and quantitative detection of phenolic compounds are of guiding significance to deal with this wastewater. A simple pretreatment method is employed to dispose the water samples, which use acetone to dissolve the water samples and pillar loaded of anhydrous sodium sulfate to remove the water in the liquid. Gas Chromatography-Mass Spectrometer (GC-MS) is then used to qualitatively analyze phenolic compounds in the water samples. The quantitative analysis method for 8 phenolic compounds is established as well. The linearity within the scope of 0.2-20 mg/L is good. The recoveries are between 72%-105% with the RSDs in the range of 1.4%-8.9%. This method is simple and reliable, which is suitable for the determination of phenolic compounds in wasterwater of coal gasification. ©, 2015, China National Chemical Information Center. All right reserved.

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