Large, Flexible, Efficient, 750°C Closed Gas Cycle Coal-Fired or Nuclear Cogeneration Plants

Abstract

A now unavoidable concern is the best possible use of a given energy source in order to meet the demand of power and heat. The most efficient, rational, thermodynamically satisfactory way of producing heat is to cogenerate it with power and to handle it as a by-product. Another basic condition is to supply heat without disturbing the operation of main turbogenerators. Closed helium cycle, non-intercooled, gas turbine coal-fired and nuclear power plants which meet these requirements are presented in this paper. Low-pressure steam and hot water are recovered from the precooler; medium, high pressure steam and steam superheating are generated by means of a bypass arrangement of the recuperator. The concept offers attractive overall energy conversion coefficients, very flexible heat production conditions and significant potentialities of reducing oil consumption. Results are given for the conservative 750 C gas turbine inlet temperature.

Power Generation From a 770°C Heat Source by Means of a Main Steam Cycle, a Topping Closed Gas Cycle and an Ammonia Bottoming Cycle

“…The relatively small topping gas turbine cycle would play a prominent part in this field for the following reasons : -its waste heat is easily available on an extended range of temperature ; -it is a closed cycle,and its load can be changed quite easily, without conversion efficiency penalty, by varying the working gas inventory, i.e. the mean pressure of the circuit ; a further improvement in increasing process heat conditions, performances and operational flexibility can be offered by a recuperator by-pass arrangement as described in (12), (13), (14), and summarily shown in Fig. 8.…”

“…main cycle bypasses, can be used ; the recovery of the waste heat is effected over a significant temperature variation range and without a phase change of fluids ; -another attractive possibility which would be very useful in the case of a change in the heat sink temperature involving a modification of the compressor inlet temperature, consists in using the so-called bypass arrangement on the LP side of the recuperator. Details about this adjustment of recuperative gas cycles can be found in (12), (13), (14), (16). A limited LP gas flow by-pass, effected from an intermediate temperature of the recuperator LP side, as shown in Fig.…”

Efficient Power Generation From Large 750°C Heat Sources: Application to Coal-Fired and Nuclear Power Stations

“…For the same studied cases, a companion paper (1) deals with the combined generation of power and process or domestic heat.…”