Transvac - Heat Transfer

Heat Transfer

Instantaneous Jet Heaters

Transvac's range of Instantaneous Jet Heaters provide a simple, low cost, silent and reliable method of heating liquids in-line.

By bringing the steam into direct contact with the cold liquid both the sensible and latent heat of the steam is fully dissipated within the liquid, making the Heaters very efficient.

Transvac Heaters are designed to perform this operation silently to prevent undue noise and wear normally associated with steam 'collapse'

Instantaneous Jet Heater

Instantaneous Jet Heater
with steam control valve

Advantages

Custom designed
Simple to install
Silent in operation
Compact
Rapid response to automatic control
No residence time
No flameproofing necessary
Materials selected to suit process

Operation

Pressurised cold liquid is introduced to the Heater and is immediately accelerated through the combining nozzle, resulting in a local pressure drop. Pressurised steam enters the unit and is discharged into the liquid at high velocity, via a number of jets around the combining tube. This method of combining steam and liquor prevents 'backing up' should the steam be under a much higher pressure than the liquid.

The two streams combine and mix intimately fully condensing the steam silently and instantaneously.

Construction

Construction is tailored to suit each application with either single units or complete systems available. Typical materials of construction include carbon steel, stainless steel, hastelloy, PTFE etc. Connections are screwed, flanged or sanitary. Proprietary and recognised codes of practice are used including ASME, BS 5500, Stoomwezen, etc.

See Application Sheet IJH010
See Application Sheet CIP010
See our Frequently Asked Questions on Instantaneous Jet heaters.
Send us your requirements using our Instantaneous Jet Heater Enquiry Form.

Desuperheaters

Transvac direct contact Desuperheaters reduce the temperature of superheated steam to produce steam temperatures approaching saturation temperature (typically to within 3 deg.C of the saturation temperature). To cool the superheated steam a medium; usually water, is entrained and flashed into vapour by absorbing heat from the steam.

Typical applications :-

To reduce the temperature of steam discharged from turbine by-pass systems on Power Plants for Heat Exchangers, Dump stations etc.
To improve heat transfer of indirect contact Heat Exchangers - Shell & Tube , Plate type, Reactor Heating Jackets etc.
To reduce the temperature of steam on direct contact applications - Food Cooking Kettles, In-line Steam Heaters, Tobacco Drying Plant and Paper Mills.

Send us your requirements using our Desuperheater Enquiry Form.

Advantages

Low cost Simple, robust design
No moving parts to wear
Minimal steam pressure drop
Flexible design options

Construction

Transvac Desuperheaters are available built to our own proprietary codes of practice or to ASME VIII div 1, PD5500, Stoomwezen and other recognized design codes. Units can be marked CE on request. Connections are sized to suit the process conditions. Standard materials of construction include carbon steel, stainless steel, chrome molybdenum steel etc., however we can also manufacture in other metals or alloys requested.

Simple Spray Nozzle
Type Desuperheater

Spray type Desuperheaters

A simple type of in-line Desuperheater with cooling water injected into the centre of the unit via an atomizing nozzle sprayed in the direction of the steam flow. Transvac Spray Type Desuperheaters are available in two options :-

Simple Spray Type Nozzle Desuperheater (SND)

The assembly is designed for mounting on a suitable flanged branch on the steam pipework. A thermal sleeve installed down stream of the unit is recommended.

Complete Spray Type Desuperheater (STD)

A complete Desuperheater ready for installation including spray nozzle, nozzle housing, thermal sleeve and flanged shell.

Applications

Relatively constant load handling duties
Turndowns up to 3:1 depending upon conditions

Venturi Type Desuperheaters

The venturi principle is used to create regions of high velocity and turbulence which produces intimate contact between the steam and cooling water.

Applications

Suitable for most general plant applications, except where high turndowns on cooling water are required

Steam Atomizing Type Desuperheaters

A high pressure auxiliary steam supply is used to atomize the incoming water within the diffuser of the unit.

The auxiliary steam pressure needs to be at least 1.5 times the Desuperheater inlet pressure with a minimum pressure of 3 bar g.

Applications

Variable load handling
duties up to 20:1

Desuperheating & Pressure Reducing Stations

Transvac can provide complete Desuperheating & Pressure reducing Stations including Control Valves, Temperature Sensors, Pressure Transmitters, instrumentation and pipework, all mounted on a support skid.

Send us your requirements using our Desuperheater Enquiry Form.
See our Frequently Asked Questions on Desuperheaters

Hot Water Generation Units

For process or service water heating requirements incorporating shell & tube, plate or steam jet units for indirect or direct contact heating technology.

Transvac offer single units or skid mounted systems.

Hot water generation system incorporating
a Transvac Instantaneous Jet heater

Shell & Tube Heat Exchangers

The most common designs of heat exchangers available are the 'U' tube, fixed plate, floating head and concentric tube type. All offer different operational features to meet most applications. Transvac manufactures to recognised codes of practice such as TEMA, ASME, BS5500, STOOMWEZEN, A.D. MERKBLATTER etc. and in a wide range of materials of construction.

Shell and Tube Heat Exchanger: U-tube Type

Direct Injection Heaters

Transvac's range of Direct Injection Heaters are used to silently heat fluids in tanks. Maximum efficiency is maintained by bringing the process fluid and steam into direct contact, the sensible and latent heat being fully utilised. Control valves, pumps, instrumentation and pipework can be supplied to provide a complete system.

Stainless Steel Direct injection Heater