Mode of work of gas-steam power unit with the closed contour of circulation of gas

Abstract

This invention relates to gas-steam power plants with the closed contour of circulation of gas and can be used at nuclear power plants. They heat up gas in a heater ( 1 ), then direct heated gas into gas turbine ( 2 ) where transform a part of heat of this gas into mechanical work, then transfer part of heat of this gas to liquid in steam heater ( 3 ), vaporizer ( 4 ) and heater of a liquid ( 5 ) connected in series on a way of a liquid and direct the steam received on an outlet of steam heater ( 3 ) into steam turbine ( 12 ). They compress the cooled in heat exchangers ( 3 ), ( 4 ) and ( 5 ) gas by multistage compressor ( 6 ) and return gas into heater ( 1 ) for repeated heating. In additional heat exchangers ( 7 ) in parallel with vaporizer ( 4 ) on a way of a liquid they additionally vaporize a liquid by heat of gas, heated at stages of the multistage compressor ( 6 ). After vaporizing of a liquid they additionally heat up received steam in the steam heater ( 3 ), installed by the first on a way of the gas after gas turbine ( 2 ). They direct steam after steam heater ( 3 ) into steam turbine ( 12 ) for transformation of steam energy into mechanical work. The division of process of vaporizing of a liquid by heat of gas into steps located in series on a way of the gas through stages of the compressor ( 6 ) at parallel submission of the vaporizing liquid to these steps allows to reduce the change of temperature difference between gas and a liquid in vaporizers ( 4 ) and ( 7 ) in the number of times corresponding to number of these steps, i.e. to raise temperature of vaporizing a liquid without changing parameters of gas turbines. Due to it the increase in thermal efficiency of gas-steam power unit with the closed contour of circulation of gas is reached.

1 . Mode of work of gas-steam power unit with the closed contour of circulation of the gas, mode in that they heat up gas in a heater and direct the heated gas into the gas turbine where transform a part of heat of this gas into mechanical work, then transfer the part of heat of this gas to liquid in heat exchangers connected in series on a way of a liquid that transfers into steam in these heat exchangers, after that they compress by the compressor the gas that was cooled in heat exchangers, they return gas into a heater for repeated heating and direct the steam received from a liquid into steam turbines for transformation of steam energy into mechanical work, CHARACTERIZED IN THAT they compress gas in the multistage compressor, install between stages of the compressor additional heat exchangers vaporizing a liquid by heat of this gas, and after evaporating of a liquid they heat up received steam in the steam heat exchanger installed by the first on a way of the gas after gas turbine, moreover in the second heat exchanger on a way of the gas after gas turbine they vaporize a liquid, in the third heat exchanger on a way of the gas after gas turbine they warm up a liquid up to the temperature close to temperature of boiling, withal simultaneously vaporize a liquid in the additional heat exchangers connected in parallel on a way of a liquid with heat exchanger vaporizing a liquid and in series among themselves on a way of the gas through stages of the compressor. 
   
   
       2 . Mode according to  claim 1 , CHARACTERIZED IN THAT by a choice of a degree of compression of gas at stages of the compressor and by regulation of the flow of a liquid through heat exchangers they provide identical temperature of gas in outlets of heat exchangers vaporizing a liquid. 
   
   
       3 . Mode according to  claim 1 , CHARACTERIZED IN THAT they heat up gas in a heater, at least, in two stages, and after an outlet from the first stage they direct the heated gas into connected in parallel among themselves after the first stage of the heater additional gas turbines for transformation into mechanical work the part of heat of gas heated in the first stage. 
   
   
       4 . Mode according to  claim 1 , CHARACTERIZED IN THAT they heat up steam in steam heat exchanger in series in two sections, moreover transform a part of heat of steam into mechanical work in additional steam turbines installed on a way of this steam between these sections and direct gas into these sections by parallel streams.