GB569441A - Improvements in or relating to combustion plant - Google Patents

Abstract

569,441. Turbine plant. MASCHINENFABRIK OERLIKON. Sept. 10, 1943, No. 14913. Convention date, Sept. 10, 1942. [Class 110 (iii)] A steam turbine circuit is combined with an air or gas turbine circuit, and a "heat pump " which takes a medium such as air at atmospheric temperature, compresses it to raise its temperature and passes the heated air through a heat exchanger to supply heat for an outside consumer such as a drying or heating plant. The waste heats from the turbine circuits are also used by the outside consumer. The air or gas for the turbine circuit is heated by the combustion chamber for the steam generator. In the plant shown in Fig. 2 fuel is burnt on a grate C heating a boiler D, superheater E, an air pre-heater L2 and economiser B in the steam system, before passing on to an outside consumer or a chimney. Steam from the boiler D passes through the superheater E, turbine F (driving a generator G) to an outside consumer H and is returned via the economiser B to the boiler. Air passes from a compressor 9 through a heat exchanger L, to L2 and is led to a turbine M (drivmg a generator N) and passes through L1 to the grate C. A second compressor J, driven by an electric motor, also suplies the grate. A by-pass may lead some air to the furnace flue. The heat pump is represented by an evaporator P, vapour compressor Q, condenser R and an expansion engine S, which may be omitted. The engine, which is shown as a turbine S, may have a pressure relief valve T. Heat from an outside source is supplied to P, increased by the compressor Q and given up in R to a medium such as air or water flowing from f to g which gives up its heat to the consumer H. The turbine M may be divided into separate turbines each driving the units Q, K, N. The loading of the air turbine plant could then be controlled by varying the speed of the compressor. Fig. 3 shows another arrangement in which the feed water for the boiler passes through economiser B1, B2, B,. In the air circuit the compressor K is cooled, supplying heat H4 for the outside consumer H. Exhaust air from the turbine M is divided, part passing as combustion air for the grate C, ar.d part to the air pre-heater L1, economiser B1 to the consumer H. Some exhaust air from M after passing through B, may be led to L2, then passing on to L1, B2 and the chimney at 99. Gases from the grate C may bypass the boiler D passing to a mixer 80, and L2 may be tapped at 81 leading to the flue 652 and the upper part of L, at 82. Instead of a steam "heat pump" circuit, an air gas circuit may be used. In this case Q would be a rotary compressor, R and P heat exchangers, and S an air or gas turbine. P may be omitted if air is used, and the compressors K and Q combined. The turbines M and S could also be combined. Liquid or gaseous fuel could be used for the furnace, or an internal-combustion chamber. The " heat pump circuit may be disconnected by shutting off the compressor Q. The air supply to K may be throttled.