The NASH condenser exhauster saves energy when air leakage increases SEE HOW MUCH MONEY IS INVOLVED INVOLVED Steam cost per million These dollar figures are computed on the pages that follow for a typical utility power generating unit. The same calculations can be applied to actual generating units now in service or projected. The analysis reveals the impressive energy savings of the NASH condenser exhauster. You lose Or this much this much with a NASH NASH with steam condenser jet ejectors exhauster Btu So you save this much with NASH NASH Dollars per 24-hour day $1 $550.80 $194.40 $356.40 $2 $1,101.60 $338.80 $712.80 $4 $2,203.20 $777.60 $1,425.60 $8 $4,406.40 $1,555.20 $2,851.20

System design assumes air leakage Venting equipment is installed on a steam condenser to prevent non-condensable gases from accumulating in the vapor space. Small amounts of non-condensables inhibit heat transfer. Large amounts can virtually block the condensation process. Some of these gases are released from solution in the liquid condensate. Some arrive with the exhaust steam, having been dissolved in the boiler water. The major non-condensable component in a fossil fueled system, though, is air in leakage that finds its way into the sub-atmospheric condenser system. A NASH AT-2006E condenser...

VENTING EQUIPMENT CAPACITIES Note: These tables are based o air leakage only and the air vapor mixture at 1 inch HgA and 71.5°F. Controlling leakage HEI venting equipment capacities When leakage increases, condenser pressure no longer depends on circulating water temperature. It rises to a higher suction pressure that enables air-removal equipment to handle all the During equipment installation and initial start-up, enough manpower and facilities must be brought in to assure compliance with all performance standards. This broad generalization applies, of course, to condenser air leakage. The...

Spray nozzle Total volume from condenser Partial vapor volume NASH vacuum pump Total volume to pump Partial air volume A NASH condenser exhauster and a steam jet ejector system sized for the same condenser air-removal duty will both meet new-system leakage requirements at the conventional 1.0"Hg absolute rating point. When air leakage increases, condenser pressure will rise above 1.0"Hg. Although the smaller differential between condenser pressure and atmospheric pressure enables either system to handle the additional leakage, their responses to pressure changes the slopes of their rising capacity...

Rising condenser pressure imposes an energy loss If the pressure rise occurs because of a rise in circulating water temperature, the resulting energy loss-at that site and under those weather conditions-is unavoidable. It becomes part of the cost of using steam to generate electric power at that time and place. From l.p. turbine Enthalpy 1100 But if the pressure rise occurs because air in leakage into the condenser system cannot be removed at full vacuum, this energy loss justifies some concern. Here are the enthalpy figures for a rise from 1.0"Hg to 3.0"Hg absolute: 1.5 "H gA bs 1.0 . "H gA...

Costs on which to base your evaluation Because management decisions are usually based on dollars, an evaluation of condenser venting performance will be most meaningful in those terms. Enthalpy penalties at the exhaust end of the low-pressure turbine can, of course, be translated into a variety of reference units. We show typical dollar figures with respect to costs per million Btu at the steam segment of the power generation cycle. They afford a quick look at the magnitudes involved. More exact numbers can be calculated using the efficiencies and fuel costs that apply in individual cases. Thus,...

Some other benefits that support the choice Only one aspect of condenser exhauster performance has been emphasized in the foregoing discussion. But a NASH condenser exhauster’s ability to cope with excess air leakage is not the only reason for its preference by consulting engineers and by the owners and operators of steam power plants. Its durability has been thoroughly demonstrated. Any initial concern about a motor-driven vacuum pump with one moving part in place of ejectors without any major moving parts has been dispelled by experience. The NASH pump is widely recognized as a rugged machine,...

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