Voedingswater regelkleppen van HORA zijn één van de belangrijkste regelappendages van het water- stoomcircuit. De klep regelt de juiste hoeveelheid voedingswater naar de ketel en het eisenpakket voor een dergelijke appendage is groot. De drukval over de klep moet zo klein mogelijk worden gehouden maar tegelijkertijd moet de klep beschikken over een goede en betrouwbare regelkarakteristiek. De hoofd regelklep is ontworpen voor het maximale waterdebiet bij lage drukverschillen. Een opstartklep, geplaatst in het midden van de hoofdplug, daarentegen wordt ontworpen voor een klein waterdebiet bij hoge drukverschillen. De kleppen worden geëngineerd voor de feitelijke aplicatie. Door de opstartregeling en de hoofdregeling onder te brengen in één klep brengt dit een aanzienlijke kostenbesparing voor de klant met zich mee!

Configuratie

• Hoofddebiet voedingswaterregeling (30-100%)
• Opstartdebiet voedingswaterregeling (0-30%)
• Gecombineerde voedingwater regelklep (0-100%)

Eigenschappen

• Hoogwaardig smeed- of gietstaal
• Z-type, haaks of rechtdoorgaand model
• Las- of flensaansluiting volgens DIN of ANSI
• + klepontlasting / - klepontlasting / pilot plug
• Speciale klepkarakteristiek
• Enkel- of meertrapsconstructie
• Zitting: geklemd
• Plug: gaatjeskooi, gaatjesplug, kaskadeplug
• DIN
• ANSI
• Pneumatisch / elektrisch

Voordelen

• Meertraps anti-cavitatie binnenwerk
• Meertraps binnenwerk processpecifiek ontworpen
• Groot en nauwkeurig regelbereik
• Hoge lekkageklasse
• Onderhoudsvriendelijk
• Geen opstartklep noodzakelijk

Fabrikant

HORA is een Duitse leverancier van hoge druk water- en stoom regelappendages. Het hele programma regelkleppen voor een moderne centrale, zowel kolen gestookt als CCGT (gasturbine met afgassenketels en stoomturbines) centrales alsook stoomnetten kunnen compleet door ons worden geleverd. Samen met het uitstekende R&D team van HORA speuren wij naar verbeteringen voor de kleppen in de water stoom cycle. Flexibele en toegewijd bedrijf, producent van “engineerd” regelkleppen.

• Regelkleppen
• Stoom omvorm ventielen
• Inspuitwater regelkleppen
• Stoomkoelers
• Cooled desuperheaters
• Turbine bypass kleppen (PRDS)
• Turbine snel sluitkleppen
• Automatische recirculatie ventielen
• Kleppen voor ultra super kritische stoomketels

Compact Ball Valves

Ball Valves are one of the most commonly used valve types, and can be found in use in a wide variety of industries. A simple 90º operation and the possibility to have uninterrupted flow pass through the assembly make this valve a popular choice for flow control applications.
To fully understand the construction of a ball valve, it is key to analyze the different functions and components of the valve. The main components of any ball valve include a valve body, two seats, stem and handle, a bonnet, and of course the ball itself.
(download de paper hieronder)

Two shift operation power plants

Power stations that were originally designed for “base load” applications are now increasingly being asked to operate on a two shift, stop/start regime; this is more commonly known in the industry as dual shifting. The multiple start/stops that these stations are now experiencing is in some instances causing an increase of operational issues due to the to the constantly changing process parameters. For example dual shift stations will experience additional thermal stress in the headers, drums, high temperature piping, valves plus the auxiliary equipment leading to additional wear and tear of their systems and component parts. This is due to the more frequent use of the plant at severe service conditions. The consequences of the change in plant operation cannot be ignored. If the plant is not operated correctly or more importantly modified properly to handle these changes the lifetime of the components within the plant will decrease enormously. The changing operational requirements of the plant require that the steam coolers, desuperheater valves, drains, feed water control valves, main steam isolation valves and the turbine quick closing valves are reviewed. These critical pieces of equipment have to be specifically designed to take the new...
(download de paper in zijn geheel hieronder)

Two shift operation power plants

Power stations that were originally designed for base load applications are now increasingly
being asked to operate on a two shift, stop start regime; this is more commonly known in the
industry as dual shifting. The multiple start/stops that these stations are now experiencing is in
some instances causing an increase of operational issues due to the to the constantly changing
process parameters. For example dual shift stations will experience additional thermal stress in
the headers, drums, high temperature piping, valves plus the auxiliary equipment leading to
additional wear and tear of their systems and component parts. This is due to the more frequent
use of the plant at severe service conditions. The consequences of the change in plant operation
cannot be ignored. If the plant is not operated correctly or more importantly modified properly to
handle these changes the lifetime of the components within the plant will...
(download de paper in zijn geheel hieronder)

Two shift operation power plants

Power stations that were originally designed for base load applications are now increasingly
being asked to operate on a two shift, stop start regime; this is more commonly known in the
industry as dual shifting. The multiple start/stops that these stations are now experiencing is in
some instances causing an increase of operational issues due to the to the constantly changing
process parameters. For example dual shift stations will experience additional thermal stress in
the headers, drums, high temperature piping, valves plus the auxiliary equipment leading to
additional wear and tear of their systems and component parts. This is due to the more frequent
use of the plant at severe service conditions. The consequences of the change in plant operation
cannot be ignored. If the plant is not operated correctly or more importantly modified properly to
handle these changes the lifetime of the components within the plant will decrease enormously.
The changing operational requirements of the plant require that the steam coolers, desuperheater
valves, drains, feed water control valves, main steam isolation valves and the turbine
quick closing valves are reviewed. These critical pieces of equipment...
(download de paper in zijn geheel hieronder)

Power stations that were originally designed for base load applications are now increasingly being
asked to operate on a two shift, stop/start regime; this is more commonly known in the industry as
dual shifting. The multiple start/stops that these stations are now experiencing is in some instances
causing an increase of operational issues due to the to the constantly changing process
parameters. For example dual shift stations will experience additional thermal stress in the
headers, drums, high temperature piping, valves plus the auxiliary equipment leading to additional
wear and tear of their systems and component parts. This is due to the more frequent use of the
plant at severe service conditions. The consequences of the change in plant operation...
This paper highlights the issue of attemporators in dual shifting power stations.

In many applications the use of a combination of a stop valve and a check valve is used. This results in two pressure containing parts, two potential leak paths and the added issues of space and especially weight.

Based on globe valves, stop-check valves have been developed in the past. By mounting a loose disk on the spindle, the disk can function as a check valve. The main disadvantage is that these valves in most cases have not been designed as stop check valves. A second disadvantage is the fact that the pressure drop over this type of valves is high, due to...

(download de paper hier onder)

Once through boiler

De technische vakterm voor een Benson flashklep is Water separator Drain Control Valve (WDCV).
Een “once-through boiler” is een ketel gebaseerd op een waterpijpcontstructie, waarvan de doorstroming
van het water en stoom door middel van een voedingswaterpomp wordt geregeld. Dit keteltype is als Sulzer- en Bensonketel rond 1920 voor het eerst geïntroduceerd.
Bij deze Sulzer- en Bensonketels wordt het voedingswater via de voedingswaterpomp de ketel ingepompt. In de ketel wordt het water respectievelijk door de voedingswatervoorwarmer, verdamper en de oververhitter geleid. Het verwarmen, verdampen en oververhitten van het water gebeurd als een continu proces. Omdat het hier een continue doorstroming betreft, is het toepassen van...
(download de paper in zijn geheel hieronder)

Project: BASF SE TDI EUROPE - Ludwigshafen

Contractor: FLUOR B.V. Haarlem

Advanced Valve Solutions levering:

• PERSTA Gate & Check Valves.

BASF SE – Ludwigshafen (DE) will build a single-train 300,000 metric tons per year production plant for TDI (toluene diisocyanate) and expand additional plants for its precursors at its site in Ludwigshafen. These include the construction of a new hydrogen chloride recycling plant as well as the expansion of plants for nitric acid, chlorine and synthesis gas. June 2013, Advanced Valve Solutions has been awarded the order for the supply of over more than 100 items - PERSTA Gate & Check Valves. Planned delivery of the valves: January 2014.

Advanced Valve Solutions is pleased to work together with Fluor BV and look forward to a successful project.

Project: De Nieuwe WarmteWeg (DNWW) - Rotterdam

Contractor: Visser & Smit Hanab Installatie BV

Advanced Valve Solutions levering:

• ZWICK TRI-CHECK, Metal Seated, Stop-Check-Valves.

For this project, 26 kilometer long piping will be installed for transporting heated water. The Nieuwe WarmteWeg will transport waste heat originating from waste incineration plant AVR Rozenburg. In the coming years 50,000 houses and companies will use this sustainable heat. The AVR Rozenburg heated water will circulate in a closed system. To keep the system pressurized, 3 booster stations will be built. Oct. 2012, AVS has been awarded the order for the supply of 19 pcs. ZWICK Stop-Check-Valves for these three booster stations. Delivery of the valves took place in April 2013. AVS is pleased to support the Rotterdam climate initiative with their CO2 (reduction) emission program.