tailieunhanh - STEAM POWER by Mike Brown_10

Tham khảo tài liệu 'steam power by mike brown_10', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Simpo PDF Merge and Split Unregistered Version - http MIL-HDBK-1003 7 Section 8. AUXILIARY EQUIPMENT Condensate Storage and Transfer. About percent of the steam flow to the turbine is lost from the cycle. These losses occur at points such as the deaerator continuous noncondensibles and steam vent pump glands valve packing leaks continuous boiler blowdown and continuous water and steam samples. Demineralized water is also required for filling the boiler turbine generator unit system initially prior to startup and during times of boiler or cycle maintenance and chemical cleaning. The condensate storage and transfer equipment is illustrated in Figure 32. Condensate Storage Tank. For normal operation the excess or deficiency of cycle water caused by load changes is usually handled by providing a condensate storage tank which can accept and hold excess condensate or provide condensate makeup for cycle water deficiency. A tank sized for twice the cycle water swell volume will usually provide sufficient capacity for normal condensate makeup and dump requirements. Condenser vacuum is normally used as the motive force to draw condensate from the storage tank to the condenser through makeup control valves. Condensate dump from the cycle to the storage tank usually is made from the condensate pump discharge through dump control valves. For cogeneration plants the function of condensate return from heating and other processes is usually combined with the function of condensate storage using a single tank. Deionized or Demineralized Water Storage Tank. Water required for filling the cycle or boiler either initially for maintenance or for chemical cleaning is usually stored in separate tanks which contain deionized or demineralized water. The amount of storage required is about 1 000 gallons per MW of installed electric generating capacity which is usually divided into not less than two tanks. Provide two pumps for transfer of water as needed