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<br /> <br />.... <br />CJ:) <br />-l <br />tu <br /> <br />and vapor pressure drop. The efficiency of the process is increased by <br /> <br />using multiple effects in series; however, this also increases the <br /> <br /> <br />pressure ratio across the compressor and the required power, so that <br /> <br />most units are limited to 2-4 effects. The plant described in this <br />report is based on data reported in Reference 29 and has 4 effects with <br />.a total temperature differential of 290F across the VTE section. Other <br />important process variables are given in Table 12. The flowsheet for <br />the process is shown in Fig. 10 and the energy and material balance is <br />given in Table 13. <br /> <br />Estimated Capital and Operating Costs <br /> <br />On the basis of the operating conditions described above and the <br />general ground rules (Table 3), a plant investment estimate was prepared <br />for an 8-mgd VC-VTE-MSF plant. The plant investment is shown in Table 14A. <br />The operating costs for the 8-mgd plant are given in Table 14B. Capital <br /> <br />and operating costs and the resulting water costs are summarized in Table 15. <br /> <br />Analysis of the VC-VTE-MSF Process <br /> <br />A generalized analysis of the VC-VTE-MSF process is difficult because <br />of the diversity of available equipment, the number of fuels that can be <br /> <br />used, and the variety of possible configurations of the process. For <br /> <br />example, the auxiliary heat can be added to the VTE section or can be <br />added between the VTE and MSF section. In the former case, the VTE <br />section might produce 90 percent of the product water, while in the <br />latter case only 50 percent might be produced in the VTE section, The <br /> <br />energy for the vapor compression process can be developed from oil, gas, <br /> <br />electric power, or even steam from burning coal. As a result, the dis- <br />cussion will be restricted to the reference 8-mgd plant selected for <br /> <br />analysis in this report, <br /> <br />44 <br />