Why deaerator pegging

Here, a vertical or horizontal doomed deaerator section is placed on top of a horizontal storage cylinder vessel. This deaerator contains a preheating section denoted by E, deaerator section denoted by F separated by a baffle denoted by C.

The low-pressure steam is passed into the system through the sparger present at the bottom of the vessel. To facilitate the stripping of out of the dissolved gases in the deaeration section, the water is preheated in the E section by the stream.

The water is then deaerated in section F. The released gases are liberated into the atmosphere through the vent. This water is then pumped into the steam-generating boilers using a pump at the bottom of the vessel. In this deaerator, a vertical doom deaeration section is mounted above a horizontal feedwater storage section. The deaeration section contains perforated trays. Water enters this section trough the spray valves present above these trays and move downwards.

The water passes from the trays into the storage vessel. Preheated steam is applied to the water from the perforated pipeline present at the bottom section. This steam heats up the water and the separated gases flow upwards. These are liberated trough the valve present on the deaerator section. There are many advantages and disadvantages associated with the different types of deaerators.

This deaerator also requires less Headroom. Its capacity ranges from to pounds per hour. The disadvantages of spray deaerator are its large amount of moving mechanical components which may require more mechanical maintenance. In this deaerator, aeration is done in two stages.

Here in the spray head area, about 90 percent of the aeration is done whereas the remaining 10 percent is done in the scrubbing or spring-loaded nozzle area. Critical miss alignments to the steam nozzle will affect the reliability of this type of deaerator. This also has limited High-pressure returns compared to other types.

The advantages of cascade type of deaerator are its high reliability, higher HP returns, high DA consistency, and High capacity. The disadvantages of this deaerator are its low Headroom, high weight and high price compared to the spray type deaerator. Deaerator is usually used with boilers in the chemical process industry or power generation industry. The use of deaerator before feeding water into the boiler highly increase the efficiency and reliability of the boilers.

The corrosion caused to the boiler can be highly reduced. The temperature of the preheated steam used in the deaerator should also be kept in check. For every 10 degrees rise in the temperature of the feedwater 1 percent rise in the gain can be observed. The amount of carbonic acid formed in the deaerator also depends on the number of bicarbonates present in the water.

What are the working temperature and pressure values for a deaerator? Water contains many corrosive dissolved gases. When this water is directly supplied to the boilers, it causes high corrosion and rusting of the boiler metal components. This damages the boilers thereby decreasing their reliability. Related questions. What is regenerative and pegging inventory in operations management? What are the venting requirements of a deaerator tank? What is the meaning of pegging? What is a function of deaerator?

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I want to know What it play an important role? The dearator not only dearates the feedwater, but it supplies liquid to the boiler feed pump BFP. Several startup events can cause the dearator pressure to drop , so to prevent that, there should be a backup supply of steam to peg the dearator. The logic for the pegging steam should be based on 2 limits: do not let the dearator pressure drop below 3 psig. Pardon the repetition with the previous, but I think I have something to add: You need to consider the HRSG deaerator like a regular boiler's deaerator.

It's an open cycle feedwater heater which brings the feedwater up to saturation before it goes through the feedwater pump. It needs a certain amount of heat to do so. During startup or other off-design operating conditions even heavy supplemental firing in some cases the LP drum will not pick up enough heat from the gases to maintain saturated steam.