1. System overview
The Coal Cartridge System (CCS) collectively imports and blends imported coal on behalf of medium-/small-lot consumers who use several thousand tons of coal per year, but for whom it is difficult to directly import. Through CCS, the imported coal is blended into suitable qualities and supplied to consumers as pulverized coal. This system was subjected, under a 3-year program starting in 1985, to demonstration tests at manufacture/supply and combustion bases, in an attempt to establish the reliability of CCS in regards to coal blending and meeting the consumers’ quality requirements. As a result, the first Japanese CCS center, with a capacity to produce 200 thousand tons per year, was built in 1991 and operation of two CCS coal- dedicated boilers commenced.
2. Features
In a typical pulverized coal-fired system, before the coal is combusted, it is stored in a stockyard. Next, it is pulverized in a mill prior to being fed to a boiler. In CCS, however, the coal is pulverized at a production/supply facility, and all processes are completed within a sealed environment, from loading the coal onto tank lorries to delivery and unloading into consumers’ coal silos after which it is then supplied to boilers. This environment-friendly process not only eliminates the problem of the dispersion of coal dust, but also enables smoother operation through easier control of powder flows and, therefore, fluctuations in boiler loads. CCS provides several benefits to consumers, like negating the need for a mill or a coal yard since the coal can now be stored in a silo. It also reduces capital investments because of the compact equipment configuration, thus leading to labor savings, as well as a better environment. CCS is, as mentioned above, a pulverized coal utilization system featuring improved coal handling and a sealed-carriage system.
3. Technical data
General attributes of CCS coal are shown in Table 1.
4. Process flow
Figure 1 shows a process flow diagram and system overview of a CCS coal production/supply facility.
Source: New Energy and Industrial Technology Development Organization (NEDO), Japan Coal Energy Center (JCOAL)
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