tailieunhanh - Process Engineering Equipment Handbook Episode 1 Part 9

Tham khảo tài liệu 'process engineering equipment handbook episode 1 part 9', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | C-244 Condensers FIG. C-272 Schematic representation of the CB condenser-type series up to the CM series. Source Alstom. For condenser calculation the OEM uses standard fouling coefficient hv for every tube material based on experience. Layout philosophy Due to the routing of the steam flow CB condensers achieve better heat transfer values k-values than some other designs. In order to obtain the required condenser pressure up to 20 percent less surface area is required in comparison with some older designs. Cold end optimization This manufacturer establishes the optimum combination condenser turbine in each case using the following parameters Cooling water temperature Cooling water flow rate Power consumption of the cooling water pump Space conditions Type Series see Figs. C-272 and C-273 In the interests of standardization a type series has been developed for the CB condenser that covers the entire power range of industrial turbines and small steam and cogeneration plants. This series provides an appropriate link to the large-scale condensers made by this OEM type series CM . Together with the option of varying the tube length it is possible to provide the optimum condenser for every requirement and plant size. Selection of Material In most cases the condenser is manufactured from material according to DIN standards. If required by the customer materials can also be used in compliance with other standards such as ASTM. Tube material The tube material on the steam side must satisfy the requirements of the water steam circuit. On the water side it must meet the cooling water requirements. Condensers C-245 FIG. C-273 Type series of CB condenser. Source Alstom. Due to the manifold requirements the selection of the tube material is of great importance. The basis of every selection is a sample of the cooling water which is analyzed by specialists. In cooperation with the end user the appropriate material is then selected. The most important criteria are Corrosion .