Mitsui Aluminium Co., Ltd. was established in 1968 with the objects to support the coal industry whose economic base was being weakened due to the drastic change in structure of the fuel source supply and to materialize the project of embarkment into the field of Aluminum smelting which had been planned by Mitsui Group for many years.
Although the coal produced by Miike Mining Station (so-called “Miike coal” ) is the best in quality in Japan, it has two unfavorable characteristics, first, easy to cause clinker trouble and second, high sulfur content. At the time of commencing the project of the power plant (1967-1968), therefore, our interest in boiler design was “how to avoid clinker trouble”. Fortunately, the result was found successful.
But the rapid progress of Japanese economy has made it necessary to strengthen the pollution control quickly, then the power companies and others have been obliged to change their fuel source. The combination use of low-sulfur oil and high stacks was one of the most prevailing counter-measures at that time. Because of the objects of establishing the company, however, Mitsui Aluminium Company determined not to give up to use coal as fuel source but to solve the problem through the combination in operation of coal fired boilers and SO
2 control plant.
In March, 1972, the SO
2 control plant was completed, and since then the power plant has been operated smoothly without trouble satisfying not only the governmental control code but also the agreements with the municipal administration.
In spite of the first large-sized commercial plant in the world, it has shown an excellent result beyond our expectation with the great satisfaction. Moreover, to our surprise, so many people concerned not only in Japan but also in the Unitesd States and many overseas countries are much interested in our success. It is our intention that we will further try to pursue higher performance and more economical operation of the plant. I believe that our strong intention to maintain coal firing power station brought us the great success in the wet calcium base SO
2 control plant.
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