Possible Waste Heat Recovery in the Condenser of a Regenerative Steam Cycle

Abstract

The present work is concerned with a new steam cycle proposed as a modification to the normal regenerative steam cycle. A steam ejector and an extra feed water heater are incorporated into the latter cycle. The motive steam of the ejector is bled from the steam turbine. The ejector entrains a portion of the saturated steam exiting the turbine and entering the condenser. Both amounts of motive and entrained steam are raised in pressure and used as heating steam in the first feed water heater. The saturated water getting out of this feed water heater is further heated in the second feed water heater and the cycle is then completed. Thermodynamic analyses of the proposed cycle are developed and used for predicting the characteristic performance of the proposed cycle. The results of the current work show clearly that the thermal efficiency of the proposed cycle is always greater than that of the normal regenerative steam cycle.

Numerical Estimation of Heat Recovery within a Distributed Incinerator Using Water and Hydrocarbons as Working Fluids

“…(1) and (5), where the unknown values T wg , T wf , and z j (j = 1) are given by Eqs. (2) through (6). Based on the calculated values, the thermal properties of working fluid are then the recalculated and all unknown values are calculated to derive a final solution.…”

“…Previous studies regarding heat recovery can be classified into three major categories: those focused on heat exchangers [4][5][6][7][8], working fluids [9], and system performance [10][11]. The qualitative classification of waste heat is performed based on temperature levels of approximately 373 K and 523 K as reference values.…”

“…The heat recovery systems are recently investigated with focusing on waste heat below 373 K. For example, evaluation of the heat transfer performance of a spiral capillary tube is performed by Yamashita and Utaka [5], analyzed heat recovery in the heat exchanger of a regenerative steam cycle [6][7][8][9][10]. And the investigation in order to obtain the optimal working fluids are performed by the comparisons of Rankin cycle on the equilibrium-state diagrams [11].…”

Application of Steam Jet Injector for Latent Heat Recovery of Marine Steam Turbine Propulsion Plant

“…In the first step, it is necessary to assume the value of losses occurring in the individual construction elements of the injector. The values of these coefficients, presented in Table 4, were assumed based on the literature (Bukurov M. and Bikic S. and Prica M 2012;Goliński A. and Troskolański T.1979;Drożyński Z., and Konorski A.1980;Gryboś R. 1956;Hegazy A. 2007;Trela M. and Kwidzinski R. and Gluch J.…”

Air Cooling in Steam Plant Condenser Using Refrigeration System for Improving Vacuum Pump Performance

“…The heat of condensation absorbed by the ammonia is rejected in an air cooled condenser of a refrigeration machine into the surrounding atmosphere. This concept was tested and well documented [11][12][13][14][15][16][17], with the participation of several major equipment vendors (Baltimore Air Coil, the Trane Company, Curtiss-Wright, CB&I, and Union Carbide). In addition, the concept of using vapor compression refrigeration system (VCRS) combined with steam plant condenser was studied in detail in [14][15][16][17][18][19].…”