Norio Arashi

Evaluation of test results of 1000 m3N/h pilot plant for CO2 absorption using an amine-based solution

Abstract Pilot plant tests of the CO 2 chemical absorption process (capacity:1000m3N/h) were carried out under various operation conditions. In the tests, a newly developed absorption solution was used. Test results were evaluated by using the overall mass transfer coefficient Kog a of the absorption process. The collected data were applied to the evaluation program which calculates plant equipment specifications and design configurations. After the computer aided study the CO 2 absorption plant for 1000MW thermal power plant was designed in which CO 2 removal is 90%. The construction area for of the CO 2 absorption plant for the 1000MW power plant will be about 170m × 110m.

A study of gas composition profiles for low NOx pulverized coal combustion and burner scale-up

A turbulent diffusion flame of pulverized coal was investigated to clarify the relationship between flame structure and NOx emissions. NO was formed in the initial flame zone and was reduced in the fuel-rich, post-flame regions, where HCN and NH 3 were produced probably by the oxidation of coal by H 2 O and CO 2 . Burner scale-up also was examined by conducting parallel experiments in a small-scale combustor and a facility with a 25-fold larger coal feedrate. The performance and the profiles of gas species in the flame of the large-scale furnace were well simulated by the data obtained in a laboratory-scale burner where combustion air inlets were remotely located from the central fuel jet to surpress the transverse mixing of air and coal.

Hybrid Methanol-Production Process

The proposed process intends to transport the energy source of wall and neutral gas from abroad to Japan. This system makes better use of the heat and materials so the efficiency of the system is expected to reach 80% and this value is 10~15% higher than that of existing methanol production systems. An evaluation of this system, under the strict CO2 regulations imposed, was undertaken. The linear-programming model, MARKAL, was used for optimizing the energy usage of Japan. The methanol made by this system can be the fuel for automobiles instead of gasoline: this will also lead to a decrease in NOx emissions in urban areas.

Particle movements on louver supporting moving granular bed

Abstract Movement of particles on a louver element which supports particles in a moving bed was investigated using several types of louvers. For smooth movement of particles on the louver element, it was found effective to utilize a double-element type louver consisting of a main louver element and a sub-louver element. An optimal inclination angle of the sub-louver to the horizontal line existed, and this value could be predicted by applying the plane stress state to the packed bed of particles adjacent to the sub-louver element. The measured stresses on the sub-louver were in good agreement with those predicted by the same theory.