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Chapter 2 Evaluation of Combined Heat and Power Technologies for Wastewater Treatment Facilities excess of 15 psig, requires full-time “24/7” staffing of the HRSG by a certified onsite boiler operator. Third, usable heat that otherwise would have been available for digester heating or other uses is reduced due to the conversion of the turbine exhaust heat into electrical or mechanical power. For these reasons, combined cycle systems are not given further consideration in this document. Figure 2-3. Combustion Gas Turbine at the Village Creek Wastewater Treatment Plant, Fort Worth, TX 2.2.2 Heat Recovery Heat energy is recoverable from combustion gas turbines equipped with a HRSG. In contrast to reciprocating internal combustion engines, which have multiple sources of potential heat recovery, heat recovery from combustion gas turbines is available only from the exhaust. Recovered combustion gas turbines heat can be used in the form of hot water, low-pressure steam, or high-pressure steam. Some of the newer combustion gas turbines include optional recuperators which preheat combustion air. A recuperator is a type of gas-to-gas or gas-to-air heat exchanger that utilizes heat from hot turbine exhaust gases to preheat the combustion air before it enters the combustion chamber. After passing through the recuperator, the turbine exhaust gases enter the atmosphere. The use of a recuperator has some advantages and disadvantages, depending on the objectives of the POTW. Use of a recuperator enables a combustion gas turbine based CHP system to operate at a higher electrical efficiency. All combustion gas turbine systems report lower emissions with the use of a recuperator. The drawbacks to recuperator use are that they can be expensive and tend to be more susceptible to damage caused by siloxanes in the digester gas. However, this can be mitigated by treating digester gas fuel more thoroughly than for non-recuperated combustion gas turbines. The POTW’s power and heat generation objectives as well as cost, digester gas treatment, and emissions require careful evaluation when considering a recuperator as part of a combustion gas turbine based CHP system. 2-7PDF Image | Combined Heat and Power Technologies for Wastewater Facilities
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