| OCR Text |
Show 9 The gas analysis system installed on the SBS facility consists of analyzers that continuously monitor and record the stack concentrations of O2, S02' CO, and CO2. The system is equipped with calibration gases that can be injected into the stack or at the inlet of the analyzers. A separate gas sampling system was used to monitor the S02 and 02 concentrations at the exit of the dry scrubber and baghouse. Approach During the LIDS feasibility demonstration, an Ohio #6 coal with 3.0 Ibsulfur/1 06 Btu (3.73%sulfur and 12,500 Btullb on an as-fired basis) was burned in the SBS. The furnace convective pass, the dry scrubber, and the pulse-jet fabric filter were fully-integrated to achieve the S02 removal goal. The first day of operation was devoted to adjusting the LIDS operating conditions to cost-effectively achieve 97% S02 removal. The conditions selected for the demonstration were as follows: Injection Temperature Range Stoichiometric Ratio (CalS), Approach to Adiabatic Saturation Temperature Slurry Percent Solids 21000 to 2300°F 1.4 mole Calmole S 10-F These conditions were then held relatively constant for the remainder of the demonstration to obtain data at the 97% S02 removal goal over an extended period of time. Results The fully-integrated LIDS feasibility demonstration met the goal of 97% S02 removal as shown in Figure 6. The LIDS system removed 98% of the S02 based on an average of the data measured during the test series. Achieving the S02 emissions goal using the B&W LIDS process required optimal S02 removal performance of the entire integrated system. Average values from the individual unit operations included 230/0 removal in the furnace, 5SO/0 in the dry scrubber, and 95% removal in the baghouse. These values are based on the inlet and outlet S02 concentrations of each operation. Figure 7 shows the total S02 removal accomplished at the outlet of each piece of the LIDS process. The furnace injection process performed well as an integral part of the LIDS system. The expected furnace injection S02 removal was achieved based on past applications. The S02 removal in the furnace was not optimized during the feasibility demonstration. There are factors that may influence the amount of S02 capture that were not addressed in this phase of the project, including limestone injection temperature (injector placement) and limestone particle size distribution. These issues will be addressed in future phases of LIDS testing. |
