OCR Text |
Show The weight of pulverized coal in the pulverized-coal feeder hopper can be used to measure coal feed rate. The use of solenoid valves for fuel control will permit rapid shutdown from the control panel as a safety measure and thereby eliminate the need for variable flow control. A small torch igniter with flame-safety controls will be included in the burner design as a safety measure. Ignition will be initiated from the master control panel by starting the torch igniter, and then turning on the coal feeder after the secondary airflow has been adjusted and the air temperature has been established. The control of the temperature of superheater metal specimens is critical and should be handled by a self-contained automatic system that can modulate compressed airflow through the tubular specimens to maintain a constant temperature. This control will be located near the exposure tunnel. During test runs, additional thermocouples on the test specimens will be connected to a temperature recorder at the control panel. ECONOMIC EVALUATION Study-grade estimates of capital costs for a pilot-scale 5 million-Btu/h coal combustion test facility (base case and alternate case) were prepared based on the facility design prepared by Battelle. The total capital investment required for the design, procurement, and construction of the base-case facility is estimated at $5,256,000 in end-of-1982 dollars ($4,651,000 in mid-1981 dollars). The alternate case total capital investment is $4,037,000 in end-of-1982 dollars ($3,572,000 in mid-1981 dollars). Breakdowns of these costs are shown in Tables 1 and 2. These estimates were prepared with study-grade accuracy (+40 percent, -20 percent). The estimated operation and maintenance cost for both the base and alternate case is $407,000 per year. The basis of the estimates and some major assumptions made in their preparation are summarized in Tables 3, 4-10 |