Pure stem generator

Pure Steam, also known as Clean Steam, is evaporator purified water that is utilized throughout the clean manufacturing process. Common uses include equipment sanitization, component sterilization and clean room humidification. Typically, Pure Steam is generated by pumping a purified feedwater through a shell and tube evaporator, which when heated by plant steam, evaporates and migrates to a centrifugal separator. The centrifugal separator, which contains a controlled level of condensed, concentrated water, functions to force all remaining moisture from the steam, produced a dry, high purified stream of Pure Steam. Click below to learn more about Aqua-Chem’s standard line of Pure Steam Generators (PSG’s).

Our Pure Steam Generators Design Incorporates A Vertical Shell And Tube Evaporator Coupled At The Top And Bottom To A Reservoir Of Feed Water. Utility Steam Is Applied To The Outer Surface Of The Evaporator Tubes With The Inner Surface Of The Tube In Contact With Feed Water. As The Feed Water Is Heated, Boiling Occurs Producing A Vapor/Liquid Mixture With Steam Occupying The Center Of The Tube And Forming A Liquid Layer At The Tube Surface. The Difference In Density Between The Liquid/Vapor Mixture In The Tube And The Liquid In The Reservoir Induces A Flow Of Feed Water From The Reservoir To The Bottom Of The Evaporator Thus Supplying Additional Feed Water To The Evaporator.

This Process Of Evaporation And Feed Water Replenishment To The Evaporator Occurs Continually And Results In A Circulating Action With Steam And Liquid Entrainment Being Discharged From The Top Of The Evaporator Tubes And Additional Feed Water Supplied From The Reservoir. An Entrainment Separation Mechanism Returns The Entrainment To The Liquid Reservoir For Reuse And Allows The Steam To Be Discharged As Product.

The Rising Film Evaporator Is Also Referred To As Natural Circulation Evaporator. This Evaporation Method Ensures Constant Wetting Of Tube Surfaces Thus Minimizing The Potential For Scale Formation And Corrosion Of The Tube Surface. The Only Mechanism Necessary To Induce The Rising Film Action And Circulation Through The Evaporator Tubes Is The Application Of Utility Steam To The Evaporator.

Standard Features

• PID level controllers for optimal feed water level control in the evaporator columns.
• Condenser is double tube sheet and tube heat exchangers to condense and cool the pure steam as WFI.
• Feedwater preheaters are double tube sheet, shell and tube heat exchangers for long term reliability.
• New evaporator gasket design for optimal seal.
• Extended 5 year warranty on the titanium U-tube bundle. The U-tube design addresses the issue of thermal cycling by allowing the tubes to expand and contract freely.
• Shell-Side Evaporation Design
• Ensures heat transfer surface will shed potential scale formation
• Submerged-tube rising-film design eliminates dry tube “hot spots”
• The plant is completely made with AISI 316 L stainless steel with active surfaces electro polished.
• Double tube sheet for heat exchanger and pre-heater.
• Unique in-built degasifying (NCGR) system in the column for removal of non-condensable gases from feed water.
• Expanded tube for tube-to-tube sheet joints.
• All contact parts to Pure Steam are electro polished with state-of-the-art technology.
• PLC based operation along with all interlocks and validated logic with skid mounted AISI 304 stainless steel control panel.
• Complete documentation to serve international audit requirements.
• Compact design ensures less foot print and shorter column height reduces ceiling height requirement.
• Unique column design requires No additional height for tube bundle removal from top.
• Reduced rouging effect by reduction of pure steam contact surface area within the column.
• Increased life cycle of equipment.
• Ease of maintenance due to reduced working height for pure steam piping and shorter column height.
• Pure steam sampling arrangement with heat exchanger for easy draw of sample in aseptic and safe temperature condition.
• The piping system is manufactured with electro polished pipes with orbital welding, sanitary fittings, and pharma grade gaskets.
• The insulation is made of Rockwool covered by AISI 304 stainless steel sheet.
• The frame is made of AISI 304 stainless steel. OUTSTANDING FEATURES
• Fully automatic proportionate control for boiler steam supply and feed water flow rate.
• All pipes and tubes as per ASME BPE stamping with less than 0.4 Ra.
• PLC system with SCADA duly validated as per 21 CFR part 11.

Specifications

• Plant Steam should be dry and saturated and 15% over Pure Steam Capacity.
• Plant Steam required is at 6 / 8 Kg/Cm² (g) pressure for Standard Operation of plant (Depends on operation at 6 / 8 Kg/Cm² (g))
• Plant Steam required is at 7 / 9 Kg/Cm² (g) pressure for Auto Operation of plant (Depends on operation at 6 / 8 Kg/Cm² (g))
• Feed water should be supplied at 25-30°C and 15% over Pure Steam Capacity.
• There is possible variation of ± 50 mm in dimensions.
• In case of Auto operation only depth will increase by 150-200 mm.
• Weight given is approximate weight considering standard equipment. Weight will change as per selection of accessories