EKI HRSG, 190 psig sat steam, 10MBtu/Hr duct firing

Waste Heat Recovery

HRSG with evaporator, steam drum and superheater

Duct fired HRSG with evaporator, steam drum, economizer and duct burners.

When you're considering waste heat recovery steam generation, you need to be talking to the experts.  At EnviroKinetics our experience base goes back many years.   Cogeneration is an energy production process combining the simultaneous generation of process steam and electric energy by using a single primary heat source.  Cogeneration, or combined cycle generation, can be employed whenever there is a need for the two energy forms and whenever on-site electric power generation is justified, or when steam users are in close proximity to an electric power generation-site.   Fuel savings is the major incentive for the use of cogeneration.  Since all turbine based electric power systems reject heat to the environment, the rejected heat can frequently be used to meet all or part of the local steam needs, or the steam can be sold to local users.  Use of rejected heat for steam generation has no effect on the amount of primary fuel used, yet it leads to a savings for the fuel that would otherwise be used for steam generation.   Cogeneration systems can be designed from at least two perspectives: They can be sized to meet the process steam needs of industrial or institutional users, so that the electric power produced is treated as a by product which must either be used on site or sold to the local utility; or cogeneration systems can be sized to meet electric power demand, and the rejected heat is then used to supply process steam needs at or near the site.  Duct firing to augment steam production is used to balance out steam requirements with electric power requirements.   Natural gas fired turbines can greatly increase their power output with nominal duct firing.  A well designed HRSG can achieve up to 95% thermal efficiency making the best use of the fuel available.  Steam pressures range from 600 psig to 3,200 psig with up to 500 degrees of superheat.  The most efficient cogeneration systems use multiple steam pressures whereby lower pressure steam is introduced into the steam turbines mid-stage.   Typical waste heat recovery systems can use horizontal tubes with vertical tubesheets, or vertical tubes with horizontal tubesheets.  Boilers can be configured with the tubes welded directly into the steam drum, or they can be configured in modules with vertical risers up to the steam drum.

Waste heat boiler and superheater for a thermal oxidizer.  Very efficient construction technique of rolling and welding boiler tubes directly into steam drum and mud drum eliminating upper and lower headers.  Small units can be shipped in one piece, larger units may be assembled on site.   Waste heat can be recovered from a thermal oxidizer to provide a return on an environmental process. Usually some amount of supplemental stabilizing fuel is required in the thermal oxidizer burner. The thermal oxidizer barrel is never equipped with tubes to absorb radiant heat. This allows the combustion to occur at a specific adiabatic temperature for a known residence time to achieve the desired destruction efficiency.  If soot producing liquids are to be combusted in the thermal oxidizer, the waste heat recovery coils are often equipped with soot blowers. For processes producing NOx, SCR systems can also be employed.

WHRU fabrication in Dallas shop.  Unit is built to ASME section 1 code and will be shop hydrotested.  Unit will ship completely assembled with flanged connections only in the field.