Industrial Steam Bath Heaters
Industrial Steam Bath Heater Operation
The process coils and the fire tubes are installed inside of a pressure vessel with two distinctive sections. The fire tube is immersed in water in the lower section of the vessel, while the process coil is located in the upper section of the vessel above the water level. During operation, heat is transferred to the water in the lower zone and causes the water to vaporize. This creates a steam zone in the upper section of the vessel which surrounds the process coils. This steam surrounding the process coil will condense on the process coil and fall back into the liquid zone below. This condensing phase change creates an exponential and uniform transfer of heat to the process without any potential for exceeding the temperature limitations of the process fluid. This indirect method of heating, combined with the high heat transfer rate, provides safe, uniform, and regulated heating of the process fluid.
The heater vessel operates at the required pressure to maintain the desired steam temperature, while the process coils are designed to handle working pressures up to 10,000 psi.
Fast response in heat output from the fire tube meets the heating requirement of the process fluid without any baffling that to restrict heat flow. Typical process outlet temperatures range from cryogenic up to 400 F.
The forced draft burner firing rate is controlled by a PID loop control signal. This signal manipulates the burner firing rate based on the temperature feedback signal from at temperature element installed in the heater bath. See also our water bath heaters available.
Applications that require high heat transfer rates with limited process tube surface areas are ideal for Exotherm forced draft steam condensing heaters. Exotherm offers a safer and more compact heater with our unique forced draft design that incorporating smaller fire tubes.
Steam Bath Heater Design Features
- Compact Design – Utilizing Forced Draft Burner Technology (Smaller Fire Tubes)
- Safe Operation – NFPA Compliant Burner Management System. FM, UL, CSA, SIL Compliance
- Custom Features – Exotherm has the experience and expertise to meet unique customer specifications
- Designed Per API-12K, ASME Section VIII or ANSI B31.1 Code
- Process Temperature up to 400 F.
- Much Less Process Coil Surface Area
- No Potential for Scorching Process Fluid
- Process Fluid Pressures up to 10,000 PSI.
- Removable Fire Tube and Process Coils
Additional Steam Bath Heater Specifications
- The process coil is fabricated from standard pipe with wall thickness and material selection compatible with the design pressure, design temperature and corrosion allowance.
- The burner is a gas-fired, forced-draft, firetube type burner. The burner shall be a low emissions burner.
- The burner has a turndown capability of 3:1 or better.
- The system comes safety controls per NFPA 85.
- Electrical controls to pre-purge the combustion chamber and heat exchanger portion with eight air changes prior to any flame ignition attempt
- Carbon steel SA516-70 vessell shell. Thickness to be determined by ASME Boiler and Pressure Vessel Code. In areas in which the vessel shell is subjected to extremely low temperatures, 304 Stainless Steel shall be used.
- The process coil is made from 304 stainless steel. The pipe is an ASTM certified pipe.
- The coil supports are 304 stainless steel