· Technical optimization of a two-pressure level heat recovery steam generator 211 The HRSG in the figure is composed of two sets of economizers, evaporators and superheaters, one for each pressure stage. Variations on the way in which the two steam outputs from the HRSG are used in the Rankine cycle can
· Other recognized boiler and pressure vessel codes and standards provide methods and rules that can be used to evaluate the fatigue life of HRSG’s. Annex I of the Pressure Equipment Directive 97/23/EC (PED)  requires that the design must take appropriate account of all foreseeable degradation mechanisms such as fatigue.
· Pressure range – 60-84 bar Critical needs – High quality makeup water External pre-treatment through distillation and mechanical deaeration – High purity steam to the turbine – No excess hydrate alkalinity – Precise control of total system water treatment High Pressure Boilers Steam cycle
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Why does steam pressure of HRSG at high pressure (HP) not exceed 200 bar even if HP feed pump is close to 200 bar? In combined cycle, HRSG are operated at tripple pressure, including HP, IP and LP
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Schematic of a triple-pressure, FFLP HRSG 1. High-purity water is a requirement for high-pressure steam generators. condensate polishing adds to upfront equipment costs and requires extra
The Only Heat Recovery Steam Generator in the World to Reach Full Steam from Startup in Less than 10 Minutes! This fully packaged heat recovery steam generator is selected from 124 pre-engineered standard models with output capabilities of 20 to 300 boiler hp and operating steam pressures from 3 …
Usually no big problem, especially if afterward you lie down to sleep, just be aware that getting up e.g. to pee can cause dizziness, if so you might need to see a doc, I personally would try to drink a cup of strong coffee first see the graph bel
Learn the basics of HRSG inspection. Stanley said that HRST often inspects high-pressure (HP) drums with water-level marks that are several inches too high, yet the operators say they are controlling to the OEM’s guidelines. The extra motion created by panel bowing often causes bellows to crack and tear. On fabric seals, bands pull
· If the level is too high, flooding of steam purification equipment can occur. If the level is too low, reduction in efficiency of the treatment and recirculation function. Pressure can also build to dangerous levels. A drum level control system tightly controls the level whatever the disturbances, level change, increase/
· design pressure for high pressure level of steam generator is 60 bar ,while low pressure level is found to be 6.0bar . Moreover ,table (2) and (3) give the design results for heat recovery steam generator for high and low
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· Heat Recovery Steam Generator (HRSG) plays an important role as a producer of steam-pressure that will be used to drive a steam turbine and generator. Damage of plain tube at High Pressure Secondary economizer in HRSG 3.2 causes of operational …
· Pressure tests are performed to ensure the safety, reliability, and leak tightness of pressure systems. A pressure test is required for a new pressure system before use or an existing pressure system after repair or alteration. There are two methods for pressure tests: hydrostatic and pneumatic. A hydrostatic test is performed by
Figure 1 also shows that as the pressure head increases due to high drum pressure (highest set pressure of pressure safety valve plus 3%), the system resistance line moves upward and cuts back on
Heat Recovery Steam Generator. The HRSG does not have any moving parts, but it has thermal inertia, and rapid heating may result in high thermal stresses, which would affect the operating life of the HRSG. In a HRSG, the high-pressure drum is most vulnerable …
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I suspect that every industry has its own criteria for steam systems, and I am only familiar with systems in an oil refinery. At the plant where I spent the first fifteen years of my career, we had the following steam systems (all expressed in PSI
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hrsg scr stack superheater fuel hp, ip & lp drains hrsg blowdown combustion turbine extractions steam turbine lp ip hp generator generator to cooling tower condenser hot well condensate pump lp pump ip pump hp pump makeup water turbine drains to superheaters to economizers surge tank deaerator high pressure feedwater heater main steam from
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· Single-Pressure, Non-Reheat Heat Recovery Feedwater Heating.This steam cycle, shown in Figure 3, has an unfired HRSG with finned tube superheater, evaporator, and economizer sections. Energy is recovered from the exhaust gas by convective heat transfer. The HRSG schematic diagram is shown in Figure 4. This is the simplest steam cycle that
This image shows the progression of corrosion-fatigue high-pressure economizer tube leaks in five units over time. Table 3. HRSG life consumption and tube panel replacement priorities (500-MW