Proof of Principal Test to Feed and Meter Granular Coal into 450 psig Gas Pressure. Second Quarterly Technical Progress Report.

摘要

The objective of this project is to demonstrate proof of principal to feed and meter granular coal into 450 psig gas pressure for use with pressurized fluidized bed combustors. This report summarizes work undertaken in the second quarter of 1999 in support of that objective. Testing has been carried out on a small scale pump, but provided inconsistent data for correlation with performance predictions based on material properties. The problems were due to the inability of the test rig to maintain a steady state condition, compounded by a limitation of the available drive to overcome a gas pressure in excess of 50 psi. In order to obtain sufficient data to enable the requirements for the 450 psi pump to be adequately defined, another series of tests was required on an intermediate pump. This pump was installed and tested in the test rig that will be used for the final high pressure tests,and enabled data to be obtained under steady state conditions up to 175 psi gas pressure. This data has enabled the high pressure pump design to be finalized and implementation of the changes needed is underway. The extra testing carried out has resulted in considerable delays in the project timescale, so a 6 month nocost extension has been requested. The final high pressure testing is now scheduled to commence in late September 1999.