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Desuperheaters

产品名称

Desuperheaters

TheDSCV-SA(DirectSteamConvertingValve-SteamAtomisation)isaleading,worldclassproductthatembracesthedemandsofoperationalexcellence,highrangeability,eliminatesthermalshocks,sizeandconnectionflexibilityan
Product description
Product video

The DSCV-SA (Direct Steam Converting Valve - Steam Atomisation) is a leading, world class product that embraces the demands of operational excellence, high rangeability, eliminates thermal shocks, size and connection flexibility and is easy to maintain.

Can be equally employed as a turbine bypass valve or steam letdown station

• Cast & fabricated design.
• Wide size configuration
• All connections flanged or butt weld or a combination of any
• High water capacity for large cooling duties
• Low required coolant pressure
• High coolant turndown ratio
• Pressure seal or bolted bonnet; ‘Quick Change’ design trim
• Class V shut off
• Noise attenuating trim options 
Single stage hush
Multi-stage hush
RAVEN
• ANSI 150 - 2500 or higher on application
Normally split rated design

Design
Standard body-to-bonnet joint, up to ANSI 900#, is bolted and incorporates a fully
enclosed spiral wound gasket made from 300 stainless steel with graphite filler. For pressure ratings above ANSI 900# a pressure seal bonnet closure is employed, which utilises a graphite-sealing ring.

Sizes
The DSCV-SA is available in an almost infinite range of sizes, materials and pressure ratings as each valve is tailored to suit a particular customers requests
and requirements.

Pressure Ratings
The DSCV-SA valve can be fully or split rated design and available in standard,
special or intermediate class. Standard classes are available up to and including
ANSI 4500#, intermediate and special class designs can be accommodated were
required. Because the DSCV-SA is normally supplied as a split rated design this
provides the customer with a convenient point for pipe transition for size, rating
and material. The DSCV-SA is of a two part construction and therefore virtually any configuration can be met to satisfy client requirements.

Maintenance
The DSCV-SA is not a high maintenance valve. However, the complete trim is a ‘Quick-Change’ style with no welded in components or large internal threaded parts. The whole trim assembly is held in compression by either a compression ring or the bonnet. By simply removing the compression ring or bonnet the whole trim merely slides out of the top of the valve. Therefore, in-situ maintenance should it be required, is both expeditious and uncomplicated with no need for any specialized tooling or training.

Actuation
Steam turbine bypass systems must be able to react and modulate very quickly under emergency conditions such as a turbine trip. Stroking speeds of less than one second may be required. The DSCV-SA can be supplied with either pneumatic or hydraulic actuation to meet this critical requirement.

 

 

DSCV-SA Direct Steam Converting Valve - Steam Atomization 

 
 

MA  Mechanical Atomizing Desuperheater

 

The MA is a mechanical atomizing desuperheater that is generally used for applications which feature steady loads. It is particularly designed for rugged service and can maintain final temperature to within 20°F (11°C) of saturation. In addition to steady load service, it is often used for attemporating applications, and performs equally well for both. Maximum cooling liquid capacity is 25,860 lbs/hr (11,700 kg/hr) at a nozzle differential pressure of 160 psi (1100 kPa) when using 100°F (38°C) water. Multiple units or other models can be installed in a header for higher capacities.

Features
The MA-I / MA-IU can be installed in pipe headers, elbows, tees and similar fittings. The main line suffers no appreciable pressure loss due to its restriction. No special supports are required for installation. The higher the main fluid velocity the better the desuperheating, since, with higher velocity, a shorter distance is required to achieve mixing. The temperature sensing element should be located approximately 40' (12m) downstream from the desuperheater.
 

The Multiple Nozzle Spray Desuperheater offers optimum performance and rangeability in a variable spray tube design. The Model MNSD-V fills the performance gap between the limited capability of a simple mechanical spray type desuperheater and the virtually unlimited capability of Copes-Vulcan’s Variable Orifice Desuperheater (Model VO). And, the MNSD-V offers high temperature capabilities and low class V leakage rating.

Features
• Temperature control to within 15°F (8°C) of saturation with the ability to hold set point within a tolerance of 10°F (6°C)
• Standard maximum available Cv of 10.5 (Kv of 8.9)
• Water flow turndown of 150:1 or higher
• User friendly design — nozzles and trim assembly can be removed without disconnecting actuator
• No need for separate cooling water control valve
• Designed for applications with temperatures up to 1150°F (620°C)
• Available in standard classes 600, 900, 1500 and 2500 per ANSI B16.5
• Cooling water inlet pressures up to 3500 psig (24 MPag) allowable standard (higher pressures allowable per application)
• ANSI Class V FCI 70-2 tight shutoff capability
• Suitable for vertical or horizontal installation
• Standard ANSI connections: 3" (80mm) raised face flange (steam) 1.5" (40mm) raised face flange (water)
• Designed for high thermal fatigue life

 

MNSD Multiple Nozzle Spray Desuperheater

 
 

Copes-Vulcan’s VO Variable Orifice Desuperheater is recognized industry wide as the most versatile desuperheater available. It is easily capable of meeting the most demanding needs for desuperheating in both the power and process industries.
The VO offers extremely fine control and exceptional turndown that is limited only by the rangeability of the coolant control valve itself.
With excellent mixing of vapor and coolant, control is possible throughout the entire operating range to within2 ± 5° F (± 2.5° C) of the set point which can be as close as 10° F (5° C) above saturation.
The coolant pressure which is required at the inlet to the VO need only be 5 psi (35 kPa) above the pressure of the vapor being desuperheated.
Because virtually all of the desuperheating occurs within the VO body itself, the temperature sensing element can be as close as 14—20’ (4—6m) from the desuperheater outlet.

INSTALLATION
The desuperheater is designed for installation in a vertical run of pipe with flow upwards. There are no requirements for straight pipe upstream or downstream of the unit, however, if a bend is located immediately at the outlet, it should be a long radius elbow.

 

VO Variable Orifice Desuperheater

 
 

The VAD is a cost effective, line size desuperheater. Produced from stock materials it is readily available to satisfy general desuperheating and gas cooling applications. Essentially a dynamically contoured, stainless steel spray head concentrically located within a short section of pipe (body). The pipe acts as the desuperheater’s outer body and pressure boundary. It fits into the main vapor line via either line size flanged or butt weld end connections for easy installation.

Features
• Temperature control to within 10°F (5°C) of saturation
• Horizontal or vertical installation
• High rangeability 15:1
• Coolant pressure need only be 7 psi (48 kPa) superior to vapor
• Self-regulating 360° coolant annulus for uniform distribution
• No spray nozzles to introduce blockage concerns
• Full atomization over entire operating range
• Minimal vapor side pressure drop
• No thermal liners required
• Butt weld or flanged to ANSI 150, 300, 600 or DIN PN10, 16, 40, 64, 100

 

VAD  Variable Annulus Desuperheater

 
 

The Copes-Vulcan SA-35 was developed to obtain a more uniform spray pattern under varying load conditions where no pressure drop in the steam header can be tolerated. Steam atomizing allows for higher turndown (up to 25:1) with varying load conditions.
Operational Features
Cooling liquid is introduced into the steam header through a stainless steel nozzle assembly, which uniquely divides one large jet of liquid into many small jets. Just prior to entrance into the main header, each jet is bombarded by a higher pressure steam jet, creating a fine mist which enters the stream flow without the need of a thermal liner inside the main header.
The SA-35 Desuperheater thus reduces the size of the liquid particles so that the droplets can be quickly and efficiently evaporated. Downstream temperatures can be controlled to within 15°F (9°C) of saturation. The stainless steel nozzle is machined from one piece and shoulders into the nozzle head so that it becomes completely trapped after assembly of the nozzle clamp which is screwed and seal welded to the nozzle head. Hard faced overlay in the nozzle head minimizes erosion wear. The thermal sleeve around the liquid tube insures uniform expansion with the steam tube, thereby minimizing thermal stresses due to unequal elongation of the liquid and atomizing steam tubes.
Due to its narrow silhouette, the SA-35 Desuperheater causes no appreciable restriction in the header. This desuperheater is made in four sizes, in pressures classes up to and including class 1500.
The cooling liquid is introduced through a series of small orifices which are drilled circumferentially into the nozzle. Small rectangular slots are milled ninety (90) degrees to the drilled holes. Atomizing steam passes through each of the slots and blasts each of the cooling liquid jets. Liquid pressure of only 10-40 psi (70—280 kPa) above header pressure is all that is necessary to introduce the cooling medium.
Atomizing steam flow is constant as the flow in the header decreases from maximum rate, until only atomizing steam is flowing. This results in improved atomization at low flows to offset the decreasing benefit obtained from the mixing and transporting capacity of the steam in the header at a reduced rate of flow.
This characteristic is unique, and is the reverse of most other types of desuperheaters.

 

SA-35 Steam Atomizing Desuperheater

 
 
 

The spring assisted multiple nozzle desuperheater reduces steam or gas temperatures by introducing cooling liquids directly into the hot fluid.
Operational Features
• Rangeability as high as 9:1
• Temperature control to within 15°F (8°C) of saturation with the ability to hold set point within a tolerance of 10°F (6°C)
• Standard maximum available Cv of 2.50 (Ky of 2.16); higher capacity available
• Available in standard classes 150, 300, 600, 900, 1500 and 2500 per ANSI B16.5
• Cooling water pressure minimum of 225 psi (1550 kPa) to a maximum of 1000 psi (6900 kPa) above the steam header pressure at the inlet
• Mounting commonality with ‘U’-Series desuperheaters

 

 

SAMN-U Spring Assisted Multiple Nozzle Spray Desuperheater 

 
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