Study On Industrial Demonstration Of Coal Gasification Based Methanol-Power Co-Production System

Energy is the base of the national economy and society development. Lack of resource and environment pollution are two issues in our national energy management. At the prolonged condition that the coal will be the main energy resource. It is meaningful for China to research and develop high efficient, clean coal utilization key technology, and build a sustainable integrative energy system of resource, energy and environment.The coal based co-production system uses coal syngas as the main feedstock for power, fuel and other chemicals production. In this coproduction system, many technologies, such as acid gas removal, gas to liquid, gasturbine and chemical reaction, are integrated for heat efficiently utilization, carbon and hydrogen streams economical utilization. So coal can be utilized cleanly, efficiently, and economically. The coal based co-production system is of strategic importance of coal chemistry and power generation development, and environment improvement. So the research, development and demonstration of coal coproction system are being promoted worldwide.This paper depends on the research and development, industrial demonstration of the new typical coal gasification technology, and the coal based methanol-power co-production system and its key technologies. The study on the coal based co-production system focus on the following contents:1. High efficient, clean coal based methanol-power co-production system creation and technologies screening of Yankuang pilot plantEnergy and exergy evaluation, contrast and analysis of different typical system which identified by combination of different unit technology with a same syngas resource and utility are performed in this section. It can conclude that the series-parallel system is the optimum option for commercial demonstration presently. In order to integrate power and heat generation with chemical process, some available chemical unit technologies are evaluated and matched by its advantage and economics.2. The simulation and emulation research of the coal based co-production systemA simulation platform of the IGCC (Integrated Gasification Combined Cycle) and methanol combined generation system based on module modeling is first researched and developed in China. On the platform, comprehensive correlations between the IGCC subsystem and the methanol generation subsystem are emulated, especially for the startup correlation between the power boiler and the air compressor of the air separation unit, and the gas feed correlation between the gasifier and the gas turbine. This provides valuable theoretical support and practical guidance for the commissioning and operation of the coal based co-production system.3. Industrialization and demonstration of the key technologies in Yankuang coal based co-production systemCoal gasification and gasturbine are two key techniques of the coal based co-production system. In the pilot plant, the opposed mult-burner(OMB) gasifier and the modified gasturbine suitable for medium-low HLV fuel are first introduced. By research of industrial design and commissioning of the two techniques, and troubleshooting of big issues in commissioning, the industrial feasibility of the two techniques can be verified.4. Operation status analysis of the Yankuang coal based co-production systemStatistics analysis of failure and operation data of the pilot plant indicates that most operation issues are general failure of normal equipments and instruments, after modification of these weak points the rate of availability and reliability can reach 90.15 percent and 98.22 percent. The estimation and analysis of power supply efficiency and total energy using efficiency on different operation conditions denote that the highest efficient condition is full capacity and series-parallel style, and the optimization goal of the coal based co-production system is verified.5. Environment impact analysis of the coal based co-production systemWaste gas, solid wastes, waste water and noise were handled separately according to its original source, density and characteristics. Environment detection of pollutant in normal operation condition indicates that the emmitions of pollutant are below the standard. The pollutant was handled in process, and the additional cost of pollutant treatment is limited. So the coal based co-production system is clean in operation.