Seismic Behavior And Design Method Of Coal Gasification Highrise Plant

There are much more coal than soil in China's energy structure and, the utilization rate of coal is not high, the conflicts between economy development and the short of energy become shaper. In order to raise the utilization rate of energy and alleviate the soil shortage, the plan of Coal Replacing Oil was put into practice in China in 2000. The Eleventh Five-Year Development Plan of Coal Industry was compiled by the State Development and Reform Commission in January, 2007. The advice to promote the orderly development of the coal conversion demonstration project was brought forward. The coal gasification highrise plant is the key plant of the coal gasification project and, its structure and equipment are very high. There is complicated connection between the equipment and structure. Under the seismic motion, there will be complicated dynamic interaction between the equipment and structure. There are few researches about the interaction. The plant designers have always not considered the interaction and, increase the risk of seismic disaster of the plant. A thorough study on the seismic behavior of the coal gasification highrise plant is very necessary, in order to carry out the Eleventh Five-Year Development Plan of Coal Industry in our country and, reduce the seismic risk of the plants.Seismic time-history analysis on a typical coal gasification highrise plant is done in the paper, by Finite Element Analysis Program ANSYS, under different parameters. Study of seismic interaction between the equipment and structure is done and, the influence of different parameters on the seismic behavior of the plant is discussed. For the plants are built everywhere in China, so different seismic ground motion parameters are selected and time-history analysis is done, in order to benefit the plant generalization in China. For there are many equipments in the plant and, there are different equipment working conditions, so different equipment parameters are selected and time-history analysis is done, in order to study the seismic behavior of the plant overally. In the end, improvements on the connection between the main equipment and the structure are done, in order to improve the seismic behavior of the main equipment. The research work about different seismic ground motion parameters: firstly, the most unfavorable seismic direction is found out; secondly, time-history analysis of the plant is done on different characteristic site period and peak ground motion acceleration. The research work about different equipment parameters: firstly, time-history analysis of the plant is done on different equipment working conditions (operation state, stop state, accident state); secondly, research is done on different primary-secondary equipments interaction conditions. The research work about the improvements on the connection between the main equipment and the structure: firstly, time-history analysis of the plant is done on different equipment-structure connection parameters; secondly, time-history analysis is done when energy dissipators are installed on the equipment.Based on the above work, the main analysis results are summarized as follows: 1, the equipment-structure interaction is strongest when the seismic direction is in the longitudinal direction of the plant. The seismic ground motion parameter plays an important role in affecting the equipment-structure interaction. When considering the interaction effect, the seismic effect of the plant structure decrease and, the seismic effect of the main equipment increase, under the same situation of ground motion parameters. 2, the equipment-structure interaction is affected by the working conditions of the equipment. The main equipment plays a main role in the interaction. 3, the seismic effect of the main equipment can be reduced to a minimum value, when the connection parameters are controlled within a certain range. Energy dissipators are very effective to reduce the seismic effect of the main equipment.Important conclusions of the paper are summarized as follows: 1, it's necessary to consider the interaction in the plant and, if the interaction is not included, then the seismic design of the plant structure is conservative and, the seismic design of the equipment is radical. 2,when the interaction is included, under different characteristic site period, the displacement of the top floor of the pant averagely decrease 10.8%(9.8%～12.8%), the base shear force of the plant averagely decrease 12.8% (8.2%～20.8%) , the displacement of the top point of the main equipment averagely increase 226.4% (187.3%～311.9%); under different peak ground motion acceleration, the displacement of the top floor of the pant averagely decrease 3.0% (-7.0%～6.5%), the base shear force of the plant averagely decrease 6.6%(3.1%～9.0%) , the displacement of the top point of the main equipment averagely increase 431.4% (223.5%～572.6%) . 3, the interaction increase the seismic displacement significantly(187.3%～572.6%), so it is necessary to do a checking calculation on the main equipment and, if it does not meet the requirement, it's necessary to retrofit the main equipment.The results of the paper can be referenced by counterparts. The achievements have guiding significance and reference value in reducing the seismic risk of the plants, in increasing the reliability of the plants, in generalization of the plants in China and, in establishing the correlated seismic code.