Power plant system having a thermochemical accumulator

Abstract

A power plant system has a heat-generating unit for providing thermal energy; a water-steam circuit, which is connected to the heat-generating unit for heat transfer; an electricity-generating device, which can be energised by the thermal energy conducted in the water-steam circuit to generate electricity; and a thermochemical accumulator, which is connected to the water-steam circuit. The thermochemical accumulator is connected to an exhaust gas line of the heat-generating unit for heat transfer, and the thermochemical accumulator has two tanks, which are connected to each other for fluid flow. A thermochemical storage material is arranged in a first tank, and the first tank is supplied with heat by thermally conditioned exhaust gas of the heat-generating unit, and the second tank is connected for heat flow to a heat exchanger, by which the second tank is supplied with low-temperature heat at a temperature level of at most 150° C.

1 .- 12 . (canceled) 
     
     
         13 . A power plant system, comprising
 a heat generating unit for providing thermal energy,   a water-steam circuit, which is interconnected with regard to heat transfer with the heat generating unit,   a power generating unit, adapted to be energized for power generation by the thermal energy guided in the water-steam circuit, and   a thermochemical accumulator, which is also interconnected with regard to heat transfer with the water-steam circuit, wherein the thermochemical accumulator is interconnected with regard to heat transfer with an exhaust gas line of the heat generating unit, wherein the thermochemical accumulator has two containers, which are fluidically interconnected with one another,   a thermochemical storage material arranged in a first container, wherein the first container is adapted to be supplied with heat by thermally conditioned exhaust gas of the heat generating unit, and wherein the second container is interconnected with regard to heat transfer with a heat exchanger, via which the second container is adapted to be supplied with low-temperature heat at a temperature level of at most 150° C., and   a second thermochemical storage material arranged in the second container.   
     
     
         14 . The power plant system as claimed in  claim 13 , further comprising
 a flow generator between the containers, and   an inert gas in the containers, adapted to be moved by the flow generator.   
     
     
         15 . The power plant system as claimed in  claim 13 ,
 wherein the thermochemical storage material arranged in the first container comprises a metal oxide and/or a metal hydroxide.   
     
     
         16 . The power plant system as claimed in  claim 13 , further comprising
 a cold sink in the second container, the refrigerating capacity of which during operation of the thermochemical accumulator enables vaporized water to be condensed.   
     
     
         17 . The power plant system as claimed  claim 13 ,
 wherein the thermochemical accumulator is interconnected with the water-steam circuit with regard to heat transfer and fluidically.   
     
     
         18 . The power plant system as claimed in  claim 13 ,
 wherein the thermochemical accumulator comprises an air supply and an air exhaust,   wherein the thermochemical accumulator is adapted to be supplied with air via the air supply, and   wherein thermally conditioned air is adapted to be emitted from the thermochemical accumulator via the air exhaust.   
     
     
         19 . The power plant system as claimed in  claim 13 ,
 wherein the thermochemical accumulator is connected between the water-steam circuit and the heat generating unit.   
     
     
         20 . The power plant system as claimed in  claim 13 ,
 wherein the power plant system comprises a positioner designed to supply a heat stream originating from the heat generating unit to the thermochemical accumulator, or to supply the heat stream to the water-steam circuit while bypassing the thermochemical accumulator.   
     
     
         21 . The power plant system as claimed in  claim 13 ,
 wherein the power plant system is adapted such that a heat stream originating from the heat generating unit is adapted to be supplied to the thermochemical accumulator, wherein after heat-transfer interaction, the residual heat stream or accordingly the exhaust gas stream is supplied to the water-steam circuit.   
     
     
         22 . A method for operating a power plant system as claimed in  claim 13 , comprising:
 charging the thermochemical accumulator by supplying heat at a first temperature level (T 1 ) to the thermochemical accumulator;   temporarily storing at least a part of this heat in the thermochemical accumulator in chemical form;   discharging the thermochemical accumulator at a second temperature level (T 2 ) and dissipating heat therefrom with transfer of heat to the water-steam circuit, wherein the discharge of the thermochemical accumulator is performed with supply of low-temperature heat at a temperature level of at most 150° C.   
     
     
         23 . The method as claimed in  claim 22 ,
 wherein, during the thermal discharge of the thermochemical accumulator at a second temperature level (T 2 ), no generation of electrical energy is performed by the power generating unit.   
     
     
         24 . The power plant system as claimed in  claim 13 ,
 wherein the second thermochemical storage material arranged in the second container is not identical to the thermochemical storage material arranged in the first container.   
     
     
         25 . The power plant system as claimed in  claim 20 ,
 wherein the heat stream originating from the heat generating unit comprises an exhaust gas stream of the heat generating unit.   
     
     
         26 . The power plant system as claimed in  claim 21 ,
 wherein the heat stream originating from the heat generating unit comprises an exhaust gas stream of the heat generating unit.