{"responseHeader":{"status":0,"QTime":5,"params":{"q":"{!q.op=AND}id:\"2180\"","hl":"true","hl.simple.post":"","hl.fragsize":"5000","fq":"!embargo_tdt:[NOW TO *]","hl.fl":"ocr_t","hl.method":"unified","wt":"json","hl.simple.pre":""}},"response":{"numFound":1,"start":0,"docs":[{"modified_tdt":"2012-04-11T00:00:00Z","thumb_s":"/b5/3d/b53d3880608a3d6c52d643833bd61b7829b7d917.jpg","oldid_t":"AFRC 2179","setname_s":"uu_afrc","file_s":"/54/0f/540f1ed82d020de0f7c3f195a000037e9f0c4b80.pdf","title_t":"Page 10","ocr_t":"is complete in the bed. Char oxidation is the principle mass loss mechanism in the freeboard. The effective char oxidation rate is a function of the intrinsic kinetic rate and the diffusion rate of the oxidizer to the particle [11]. For the fluidized bed freeboard chars from Pittsburgh No. 8 coal, the intrinsic rate from Sergeant and Smith [12] has been used. The rate is defined as: Ki \" *E Ai V\"^ <18) Other rate constants for this expression are available from Goetz [13]. Time integration of the particle momentum and energy equations are made with the average particle mass over the timestep. Analytical expressions for the time integration give the new particle position and temperature at the end of a timestep. COMO computes the changes in particle mass, momentum and energy as a particle stream traverses a control volume. The changes are used to calculate source terras for the gas phase control volume conservation equations. The particle and gas phase energy equations require G defined by Eq. 17 from the radiation module. In the axisymmetric version of COMO [4] the discrete-ordinates method was used. For 3-D calculations, the discrete transfer (DT) method [14] has been applied. This was accomplished by inserting a DT radiation module from B&W's FURMO furnace modeling program into COMO. The DT method uses the radiative transport equation with isotropic scattering: -10-","restricted_i":0,"id":2180,"created_tdt":"2012-04-11T00:00:00Z","format_t":"application/pdf","parent_i":2215,"_version_":1642982463820005376}]},"highlighting":{"2180":{"ocr_t":[]}}}