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1 SURVEY OF CHEMICAL EMISSIONS Table 38. Energy Performance Levels (Btu/lb) for the Production of Maleic Anhydride Base Heat Integration Process Theoretical Process Improvements Redesign Energy Level 0 Level 1 Level 2 Level 3 Level 4 Electricity 1421 1421 1421 1271 Hot utility 2857 1312 901 1487 Auxiliary fuel for incineration 3227 3227 3227 252 Hot utility credit -6698 -6698 -6698 -10263 Net Power & Hot Utility 807 -738 -1149 -7253 Fuel for electricity 4581 4581 4581 4097 Fuel for steam/heat transfer fluid 5036 2249 1574 2711 Auxiliary fuel for incineration 3227 3227 3227 252 Total fuel energy 12844 10057 9382 7060 Fuel energy credit -12077 -12077 -12077 -19487 Net fuel energy consumed 767 -2020 -2695 -12423 -5522 Raw material energy 15025 15025 15025 19812 5522 Total energy for process 15792 13005 12330 7389 0 Table 38 provides an example of using emissions from a chemical process for energy recovery. There is a 53% reduction in total energy used once the Levels 1-3 redesign is implemented. Use of a fluidized bed reactor in the Level 3 design lowers the yield to 46% (from 59% for baseline). The waste gas stream, which has a high butane concentration, is not incinerated, but is used as fuel to generate steam. Glass Industry The annual glass production is 20 MTons/year in the United States.21 The emissions estimate for glass and glass fiber manufacture was determined using the approach described in the emission estimation technique manual prepared by the Queensland Department of Environment (Australia) [11]. Tables 39 and 40 give the gas emission factor (kg/ton) for glass manufacture. Table 39 provides glass production levels from various processes. Table 40 provides the emission factor and emission levels for glass fiber production, with the production level being 2.72 MTons/year. Production level for wool and textile are assumed to be 50:50. 21 http://www.eia.doe.gov/emeu/mecs/iab/glass/page6.html. 34PDF Image | Analysis for Recovering Energy from Industrial Waste Heat
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