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Introduction to Quicksteam boiler Quicksteam Boiler Description

Plant economics and steam plant operation today

Changes in steam properties such as pressure and temperature have a detrimental impact on unit operations affecting product quality, increasing equipment wear and generating higher energy costs. Energy efficiency is usually sacrificed for the sake of stable process operation since the priority of most plants is to ensure a reliable supply of steam.

Steam Plant Constraints, Boiler Operation and Plant Energy Efficiency for a Typical Plant

Water-tube type boilers are used in most manufacturing processes. Their advantage lies in the fact that they have a large warm water pot called the steam drum that minimizes the impact of steam flow variations on steam header pressure.

There are four main disadvantages to water-tube boilers:

  • Rise time from low steaming rate to high steaming rate is slow
  • Lengthy amount of time required to heat the boiler from normal temperature to a low steaming rate (from 30 minutes to hours)
  • As with all boilers, water-tube boilers may stop operating altogether (trip). Because of this, backup boilers are always used: if one boiler trips, another one (or two) take over to ensure a constant header pressure
  • Boilers have a limited minimum steaming rate based on their maximum steaming rate – typically 20%. For instance, a boiler with a 100,000 pph steaming rate will typically not be able to reduce its load below 20,000 pph. This means that the minimum fuel consumption of a boiler is 20% of its maximum rated capacity

Examples of Steam Plant Operating Conditions >>