TAILIEUCHUNG - Process Engineering Equipment Handbook 2009 Part 14

Tham khảo tài liệu 'process engineering equipment handbook 2009 part 14', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | P-156 Power Transmission FIG. P-130 Energy-saving curve with optimized ratio. Example boiler feed pump drive. Source J. M. Voith GmbH. FIG. P-131 Pump characteristics and boiler resistance curve. Source J. M. Voith GmbH. changed. This has led to the development of two regulating methods that are now in general use a. By installing a throttle valve the boiler resistance curve is brought up to the required higher pressure level throttle regulation . b. By varying the pump speed the pump curve is changed speed regulation . Design of the boiler feed pump. The maximum continuous load of boiler must be the basis for determination of the design point of the feed pump see Fig. P-132 . 1 Boiler resistance curve in constant pressure operation 2 Boiler resistance curve in varying pressure operation 3 Pump curve of the half-load pump 4 Pump curve of the full-load pump 5 Maximum continuous rating of the boiler 6 Design point Pk Maximum permissible boiler pressure Power Transmission P-157 FIG. P-132 Curves required for boiler feed pump design. Source J. M. Voith GmbH. FIG. P-133 Optimizing pump performance. Source J. M. Voith GmbH. The pressure head of the feed pump must be so sized that the geodesic head can be overcome and the required pressure increase flow rate and pressure losses plus a 10 percent extra related to the maximum boiler operating pressure can be attained. For completeness Fig. P-132 also has the curves for constant and varying pressure operation. The fact that the position of these curves differs has no real effect on the subject under discussion. Furthermore this introductory section only deals with the basic outline of the considerations that affect the choice of a feed pump. Comparison between speed regulation and throttle regulation OPTIMUM USE OF PUMP. Figure P-133 shows that with throttle regulation the throttle valve has to raise the boiler resistance curve even during full-load operation. Each flow rate reduction required can only be achieved by .

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