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How Direct Steam Injection works - Hydroheater - JetCooker

Hydro-Thermal Jetcookers - The Industrial Inline Steam Heater

Industrial Jet Cooker Applications & Benefits

The Industrial Jetcooker is ideal for heating liquids and slurries over a wide range of viscosities and solid contents to precise temperatures. With the unique manual or automatic combining tube adjustor, you can easily control the process shear which makes this heater the perfect choice for achieving optimum starch conversion.


How Do Jetcookers Work?

The Jetcooker is an exclusively designed and patented direct contact inline steam injection heater that may look like any 3-way valve but instead is a unique engineered heating device that sets it apart from competitor's steam Jetcookers.

The internal parts precisely mix metered amounts of steam directly with a liquid or slurry, providing instantaneous transfer of heat from steam to the liquid. Steam immediately condenses, eliminating hammer and vibration and causes a turbulent mixing action that self-cleans the unit. Two distinct properties for effective and uniform heating of liquids or slurries are used. These properties are internal modulation and choked flow.

INTERNAL MODULATION assures precise steam control and produces predictable results based on the position of the stem plug. A variable-area steam nozzle meters steam flow at the point where steam and liquid first contact and mix. This technique eliminates the need for an external steam control valve. Only the cross sectional area of the steam nozzle changes which provides process stability through a much wider variation of your process conditions. 

CHOKED FLOW (propels, accelerates, launches) your process heating to the speed of sound. Precisely engineered nozzles generate a steam pressure differential that “chokes” the mass flow rate of steam and accelerates it to sonic velocity unique to Hydro-Thermal Hydroheaters. When the steam heater's flow is choked, the Jetcooker can internally modulate the steam flow by adjusting the flow area between the steam and process fluid giving you precise and rapid temperature control. Steam traveling over 1500 ft/sec creates a forceful jet preventing hard water scale and burn on from building up. The self cleaning feature frees you from frequent process interruptions and chemical baths resulting in total uptime!


Jetcooker Applications

The Industrial Hydroheater is used in a variety of applications including pulp and paper processing, starch cooking, biofuelsethanol and starch conversion, large volume water, anaerobic digestion, cooking, and more. In fact, the Industrial Hydroheater is Hydro-Thermal’s most commonly used heater. To learn more about applications for our inline steam heater categorized by industry, head over to our industries page.


Benefits of Direct Steam Injection Jetcookers

  • Hydroheaters reduce energy/steam consumption
  • 100% Thermal Efficiency; uses both latent and sensible heat of the steam
  • Eliminates energy losses through condensate return
  • Eliminates the heat transfer barrier of heat exchangers for improved efficiency
  • Reduces process heating time
  • Jetcookers have quicker startups (tankless water system)
  • Single pass in-line process heating
  • Faster tank heating (self-pumping recirculation loop)
  • Sonic velocity steam injection allows for instantaneous heating
  • No need to use an external steam valve
  • Precise temperature control to +/1ºF [0.50°C] over large liquid turndown ratio
  • Fast response to changes in temperature setpoint


Jetcooker Product Designs/Descriptions/Capabilities

  • Available in eleven sizes
  • Flow rates up to 6,700 gpm
  • Sizes from 1/4" to 12" outlet piping
  • Large temperature rise possible
  • Rugged ASME design/construction
  • Available in a variety of alloy materials
  • High solids capability
  • Can be designed for low shear (water heating) to high shear (starch conversion)


Custom Jetcooker Systems

There are many ways that you can customize your Jetcooker to your specific processing needs.

Custom Skids - ATTEC® skids are available utilizing the Jetcooker. ATTEC systems are designed, built, and installed to your individual process specs.

High Vibration Applications - Hydro-Thermal's heaters utilize a Fisher reverse-acting diaphragm actuator (“fail close”). Generally coupled with a filter/regulator and a Fisher DVC 2000 or a DVC 6200 positioner that converts a 4-20 mA DC input signal to pneumatic output signal to the actuator. For high vibration applications remote mount positioners are available. Alternative positioners are available depending on unique processing conditions or upon request. Please contact Hydro-Thermal for more details.

Abrasive Fluids - The Jetcooker is very robust and reliable, and can be further enhanced as needed for heating abrasive fluids. For many applications, a weld overlay and enriched material in key areas is sufficient. Some applications such as slurries with sand content require additional overlays outside the basic weld overlay. This technique has greatly increased the heater’s internal component lifespan. Other fluids have required more extensive modifications. In oil sands froth heating applications, for example, a combination of a weld overlay as well as the use of hard, abrasive resistant materials is recommended. For specific requirements for your application, please contact Hydro-Thermal directly.

High Temperature Rise - All Jetcookers include a combining tube. An extended combining tube may be recommended for a large ΔT (high temperature rise). Please contact Hydro-Thermal for more details.


3A Certified Jetcookers

For companies that require a 3A certified Jetcooker, the Sanitary Hydroheater is the perfect option to effectively cook food & beverages, starch & sweeteners, and more.


Jetcookers Designed for Specific Operating Conditions

The Industrial Hydroheater/Jetcooker is made for your specific operating conditions.  We need to know a little bit about your process and plant set-up in order to design the heater or skid that will work best for your conditions.  Please fill out this form or contact us here.

Looking for more information on our products? Head over to our products page. 

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Hydro-Thermal is the global leader in the development and manufacturing of Hydroheaters. Through our vast global channel partners, we support hydro heating in six continents and all industrialized areas. We create heating systems for a variety of industries including: pulp, paper, chemical, ethanol, food & beverage, metal, & more!

Hydro-Thermal Corporate 

400 Pilot Court
Waukesha, WI 53188 USA
Phone: (262) 548-8900
Fax: (262) 548- 8908