DE102014106300A1 - Steam delivery device and method of providing steam - Google Patents

Abstract

In order to provide a steam supply device by means of which flexible and efficient steam, in particular saturated steam, can be provided, it is proposed that the steam supply device comprises: a heat storage device; several pressurized water storage tanks; a water supply for supplying water to the pressurized water storage tanks; a heat transfer device by means of which optionally one or more pressurized water storage tanks heat from the heat storage device can be fed.

Description

The present invention relates to a steam delivery device for providing steam, in particular saturated steam.

Such a steam supply device may for example comprise a pressurized water storage tank in which hot water can be stored under high pressure. By opening a drain valve, the water can be removed if necessary. Due to the high temperature and the high pressure, the water can be removed in particular in the form of saturated steam. Due to the removal of water from the pressurized water storage tank, the high temperature and / or the high pressure in the pressurized water storage tank can usually be maintained only for a short time. Consequently, such a pressurized water storage tank usually has a low storage capacity.

The present invention has for its object to provide a steam supply device by means of which flexible and efficient steam, in particular saturated steam, can be provided.

This object is achieved according to the invention by a steam supply device for providing steam, in particular saturated steam, the steam supply device comprising:
a heat storage device;
several pressurized water storage tanks;
a water supply for supplying water to the pressurized water storage tanks;
a heat transfer device by means of which optionally one or more pressurized water storage tanks heat from the heat storage device can be fed.

By providing a heat storage device and a plurality of pressurized water storage tanks according to the present invention, it is preferable to achieve separation between the steam supply performance of the steam supply device on the one hand and the steam capacity of the steam supply device on the other hand. In particular, this flexible and efficient, a large amount of steam, in particular saturated steam, can be provided.

The heat storage device and the pressurized water storage containers are preferably devices different from each other.

It may be beneficial if the pressurized water storage tank Ruthsspeicher.

The heat storage device preferably comprises one or more solid heat storage.

It may be favorable if the heat transfer device comprises a transfer fluid guide, by means of which a heat transfer fluid from the heat storage device to the pressurized water storage containers can be fed.

The heat transfer fluid is in particular a gas, for example air, or a liquid.

Preferably, a pressure of the heat transfer fluid in the transfer fluid conduit is less than about 5 bar, preferably less than about 2 bar. For example, the pressure of the heat transfer fluid in the transfer fluid guide is approximately equal to the atmospheric pressure.

The pressure of the heat transfer fluid is preferably substantially independent of the pressure of the water in the pressurized water storage tanks.

The transfer of heat from the heat transfer fluid to the water in the pressurized water storage containers is preferably carried out by means of a liquid-liquid heat exchanger or by means of a gaseous-liquid heat exchanger.

It may be advantageous if at least one storage container of the heat storage device can be flowed through by the heat transfer fluid.

In particular, it can be provided that at least one storage container of the heat storage device can be flowed through by the heat transfer fluid, that heat can be transferred from the storage medium to the heat transfer fluid by direct contact between the heat transfer fluid and a storage medium of the heat storage device.

The storage medium is preferably a solid, for example a bed.

As a storage medium may be provided, for example, a ceramic material and / or a stone material.

The heat transfer fluid is preferably feasible by means of a fan and / or fan in a cycle.

In particular, it can be provided that the heat transfer fluid can be guided in a closed transfer fluid guide.

It may be advantageous if the transfer fluid in the closed transfer fluid guide optionally and / or repeatedly successively the heat storage device, one or more pressurized water storage tanks and / or a heat source can be fed.

The heat transfer fluid and the water of the pressurized water storage tanks are preferably fluids different from each other.

Furthermore, it can be provided that the heat transfer fluid and the water of the pressurized water storage tank are spatially separated from each other.

The pressurized water storage tanks by means of the water supply preferably liquid water can be fed.

In particular, it can be provided that the pressurized water storage containers by means of the water supply substantially pressureless water is supplied.

In one embodiment of the invention it can be provided that the steam supply device comprises a heating device for heating the water to be supplied to the pressurized water storage tanks.

In particular, in this case, a heat exchanger may be provided which, for example, allows heating of water in a reservoir device of the water supply.

The water in the water feed is preferably not evaporated and preferably not pressurized.

It may be favorable if the heating device is a device which is different from the heat storage device and / or uses heat from a heat source different from the heat source for the heat storage device.

Alternatively, however, it can also be provided that the heating device uses heat from the heat storage device and / or from a heat source for the heat storage device.

It may be advantageous if the steam supply device comprises a heat buffer device, by means of which heat from one or more pressurized water storage tanks is temporarily stored.

In particular, it may be provided that, for supplying water to one or more pressurized water storage tanks, these one pressurized water storage tanks or these multiple pressurized water storage tanks are cooled by transfer of heat to the intermediate heat storage device. The supplied water can thus be supplied in particular at low pressure.

Preferably, after the water has been supplied to the one pressurized water storage tank or to the plurality of pressurized water storage tanks, the heat stored in the heat buffer storage device may be again supplied to the one pressurized water storage tank or the plurality of pressurized water storage tanks to heat the water contained therein.

The intermediate heat storage device preferably comprises a plurality of storage elements or storage sections for storing heat at different temperature levels. In particular, efficient heat buffering can be made possible in this way.

The present invention further relates to a method for providing steam, in particular saturated steam.

The invention is in this respect the task of creating a method by means of which steam, in particular saturated steam, flexible and efficient to provide.

This object is achieved according to the invention by a method for providing steam, in particular saturated steam, comprising:
Storing heat by means of a heat storage device; Supplying water to pressurized water storage tanks by means of a water
supplying;
Transferring heat from the heat storage device to one or more pressurized water storage tanks;
Removing steam, in particular saturated steam, from at least one pressurized water storage tank.

The method according to the invention preferably has one or more of the features and / or advantages described in connection with the steam delivery device according to the invention.

Furthermore, the steam delivery device according to the invention preferably has one or more of the features and / or advantages described in connection with the method for providing steam.

It may be beneficial if the heat is transferred by means of a heat transfer fluid from the heat storage device to the one or more pressurized water storage tank.

In particular, it can be provided that at least one storage container of the heat storage device is flowed through with the heat transfer fluid, so that preferably by direct contact between the heat transfer fluid and a storage medium of the heat storage device heat is transferred from the storage medium to the heat transfer fluid.

In one embodiment of the invention can be provided that water is supplied to one or more pressurized water storage tanks, while water is heated in one or more other pressurized water storage tanks and / or steam, in particular saturated steam, is removed from one or more further pressurized water storage tanks.

Furthermore, it can be provided that water vapor, in particular saturated steam, is withdrawn from one or more pressurized water storage containers while water is supplied to one or more further pressurized water storage containers and / or is heated in one or more further pressurized water storage containers.

In a discharged state of the pressurized water storage tank, a temperature of the water contained therein is preferably at least about 150 ° C at a pressure of preferably at least about 5 bar.

In a loaded condition of the pressurized water storage tanks, the water in the pressurized water storage tanks preferably has a temperature of at least about 250 ° C, for example about 300 ° C, and / or a pressure of at least about 30 bar, for example about 40 bar to about 100 bar.

Furthermore, the steam supply device according to the invention and / or the method according to the invention for providing steam may have one or more of the features and / or advantages described below.

By means of the heat storage device, preferably, heat can be stored at a temperature level of at least about 400 ° C to, for example, about 1000 ° C.

The heat storage device is preferably designed as a directly through-flow heat storage, in particular as a so-called regenerator.

Preferably, the steam delivery device comprises a combination of a regenerator and a plurality of ruth stores.

Preferably, high-temperature heat by means of gaseous heat carriers, for example air or flue gas, can be stored in a heat accumulator with high capacity, in particular if there is a low heat requirement and / or electrical energy requirement.

At high heat demand and / or electrical energy demand can be provided with high discharge capacity preferably via a plurality of alternately interconnected pressurized water storage tank, in particular Ruthsspeicher, saturated steam.

In particular, this heat can be transferred from the heat storage device by means of heat exchangers to the pressurized water in the pressurized water storage tanks to ultimately provide saturated steam by relaxing the pressurized water storage tank.

Preferably, a highly flexible provision of saturated steam with high temperatures and power with simultaneously large storage capacities can be made possible in a variety of applications.

In particular, this can improve the dynamic behavior of conventional power plant types, in particular lignite or hard coal-fired power plants, as part of the increased expansion of renewable energies with the associated high power fluctuations.

The steam delivery device is preferably suitable for use in the chemical industry for the flexible provision of process steam, in power plants with water (steam) as a heat carrier or energy carrier and in the large-scale storage of electrical energy. The electrical energy is generated in particular by the use of saturated steam for driving a saturated steam turbine and a generator device coupled thereto.

Preferably, the steam is removed as saturated steam from at least one pressurized water storage tank.

It may be favorable if the steam, in particular the saturated steam, is overheated after removal from the at least one pressurized water storage tank.

For example, the overheating by supplying heat from the heat storage device on the extracted steam, in particular the saturated steam occur.

By overheating the saturated steam in particular superheated steam can be provided.

The transfer of heat from the heat storage device to the extracted steam to produce superheated steam can be done in particular by means of a heat exchanger.

The heat storage device is preferably a solid storage or liquid storage.

For example, a liquid reservoir may be provided, which comprises a thermal oil, a mineral oil or a liquid salt storage medium. Preferably, the storage medium is a storage medium with high heat capacity and low cost. The storage medium makes it possible, in particular, to produce a cost-effective capacity store.

The heat transfer fluid may be, for example, liquid or gaseous. The temperature of the storage medium is preferably between about 300 ° C and about 400 ° C, especially in the case of thermal oil or mineral oil.

When using liquid salt as a storage medium, in particular a temperature of 450 ° C to about 500 ° C may be provided.

For example, when using a solid as a storage medium, the temperature is up to about 1000 ° C.

It may be favorable if fresh steam from a boiler of a coal-fired power plant or a turbine device, in particular from turbine branches, is supplied to the heat storage device in order to load the heat storage device with heat.

In particular, can be used for loading the heat storage device with heat coupling with a water-steam cycle of a coal power plant, which in particular a desired flexibility of the power plant by improving the minimum load capacity and load change speed can be achieved.

In principle, the heat for loading the heat storage device can also originate from the combustion air from the boiler and / or from combined cycle power plants (gas and steam combined cycle power plant) from the waste heat of the gas turbine.

Further preferred features and / or advantages of the invention are the subject of the following description and the drawings of an embodiment.

In the drawings show:

1 a schematic representation of an embodiment of a steam supply device, wherein a first pressurized water storage tank heat is supplied, wherein a second pressurized water storage tank water is supplied and wherein from a third pressurized water storage tank steam is removed;

2 one of the 1 corresponding schematic representation of the steam supply device, wherein from the first pressurized water storage tank steam is removed, wherein the second pressurized water storage tank heat is supplied and wherein the third pressurized water storage tank water is supplied; and

3 one of the 1 corresponding schematic representation of the steam supply device, wherein the first pressurized water storage tank water is supplied, wherein from the second pressurized water storage tank steam is removed and wherein the third pressurized water storage tank heat is supplied.

Identical or functionally equivalent elements are provided with the same reference numerals in all figures.

One in the 1 to 3 illustrated embodiment of a whole with 100 Specifically, the designated steam supply device serves to provide process steam, for example for driving a steam turbine device (not shown).

The steam delivery device 100 includes several pressurized water storage tanks 102 , which in particular as Ruthsspeicher 104 are formed.

Furthermore, the steam delivery device comprises 100 a heat storage device 106 by means of which heat from a heat source 108 is storable.

The heat source 108 For example, it may be a gas turbine apparatus (not shown) which, in use, generates an excess and thus possibly not fully usable amount of heat.

By means of the heat storage device 106 For example, the excess heat may be stored for later use.

The steam delivery device 100 further comprises a heat transfer device 110 for transferring heat from the heat storage device 106 on the pressurized water storage tank 102 ,

The heat transfer device 110 includes in particular a transfer fluid guide 112 by which a heat transfer fluid optionally one or more pressurized water storage tanks 102 , the heat storage device 106 and / or the heat source 108 can be fed.

By means of the transfer fluid guide 112 In particular, a closed circuit for the heat transfer fluid is formed.

The heat transfer fluid is in particular a gas, for example air.

For driving the heat transfer fluid in the transfer fluid guide 112 includes the heat transfer device 110 preferably one or more fans 114 ,

In particular, for coupling the heat transfer device 110 with the pressurized water storage tanks 102 are several heat exchangers 116 the steam delivery device 100 , in particular the heat transfer device 110 , intended.

The heat storage device 106 is for example as a solid heat storage 118 educated.

The heat storage device 106 in particular comprises one or more storage containers 120 , which with a storage medium 122 are filled.

The storage tank 120 is traversed by the heat transfer fluid. The heat transfer fluid preferably comes directly to the storage medium 122 in contact. This can heat very efficiently from the heat transfer medium to the storage medium 122 and / or from the storage medium 122 be transferred to the heat transfer medium.

The heat transfer in the heat storage device 106 is thus a direct contact heat transfer.

The heat transfer in the area of the pressurized water storage tank 102 on the other hand, there is an indirect heat transfer by means of the heat exchanger 116 ,

The steam delivery device 100 further comprises a water supply 124 , by means of which water to the pressurized water storage tanks 102 can be fed.

The water supply 124 includes a reservoir device 126 for receiving and providing the water and a pump device 128 for conveying the water to the pressurized water storage tanks 102 ,

That in the reservoir device 126 absorbed water is preferably by means of a heater 130 the steam delivery device 100 preheated. The heater 130 this can in particular heat from the heat storage device 106 and / or from the heat source 108 use.

For targeted supply of heat to each of the pressurized water storage tank 102 are several valves 132 intended.

Thus, individual pressurized water storage tanks 102 targeted heat supplied to generate steam.

This steam can be via a steam discharge 134 the steam delivery device 100 be dissipated.

The pressurized water storage tanks 102 are each with a balance valve 136 Mistake. In particular, the compensation valve 136 be used to remove water vapor from the pressurized water storage tank 102 let off when the pressurized water storage tank 102 filled with liquid water. An undesirable increase in pressure when filling the pressurized water storage tank 102 with water can be avoided.

The steam delivery device described above 100 works as follows:
By means of the heat source 108 First, the heat storage device 106 loaded with heat.

For this purpose, in particular, a heat transfer fluid alternately the heat source 108 and the heat storage device 106 fed, so that in the storage container 120 the heat storage device 106 arranged storage medium 122 is heated.

Especially when the heat source is switched off 108 can the heat storage device 106 be used for the production and supply of steam.

The valves 132 the heat transfer device 110 are switched so that a pressurized water storage tank 102 Heat from the heat storage device 106 can be fed.

At the in 1 shown circuit of the valves 132 is a first pressurized water storage tank 102 by heat from the heat storage device 106 heated.

The pressurized water storage tank 102 is during the heating of the water supply 124 and from the water vapor removal 134 decoupled. In addition, the compensation valve 136 of the first pressurized water storage tank 102 closed.

By heating the in the first pressurized water storage tank 102 arranged water can thus a high temperature and at the same time a high pressure in the pressurized water storage tank 102 be generated.

In particular 2 can be seen, is the first pressurized water storage tank 102 after being loaded with heat to provide steam.

The valve 132 will be closed. A (not shown) valve of the water vapor removal 134 will be opened.

About the steam removal 134 can the high pressure hot water from the first pressurized water storage tank 102 be dissipated and used in particular in the form of saturated steam.

For example, this saturated steam can be used to drive a steam turbine device (not shown).

By removing steam from the first pressurized water storage tank 102 decreases the water content of the pressurized water storage tank 102 as well as the temperature and pressure in the pressurized water storage tank 102 ,

After delivery of a certain amount of steam, the pressurized water storage tank 102 Consequently, again closed, in particular, a valve of the steam discharge 134 closed.

In particular 3 can be seen, is the first pressurized water storage tank 102 then by means of the water supply 124 again filled with water. In order to avoid an undesirable back pressure during filling, this is the compensation valve 136 open.

After filling the first pressurized water storage tank 102 with water can by re-supplying heat from the heat storage device 106 to the first pressurized water storage tank 102 again the in 1 shown initial state can be achieved.

In addition to the first pressurized water storage tank 102 are at the in the 1 to 3 illustrated embodiment of the steam delivery device 100 two further pressurized water storage tanks 102 namely, a second pressurized water storage tank 102b and a third pressurized water storage tank 102c , intended.

Like that 1 to 3 it can be seen, are the pressurized water storage tank 102 . 102b . 102c preferably always in mutually different operating conditions.

For example, while the first pressurized water storage tank 102 is heated, the second pressurized water storage tank 102b preferably filled with water. From the third pressurized water storage tank 102c In the meantime, steam, in particular saturated steam, is preferably removed (see 1 ).

As in particular from a comparison of 1 to 3 shows, the pressurized water storage tank 102 . 102b . 102c one after the other filled with water, heated and finally used for steam supply.

The pressurized water storage tanks 102 . 102b . 102c are in particular so sequentially in the different operating conditions, that in particular always at least one pressurized water storage tank 102 is prepared for the supply of steam. By means of the steam delivery device 100 Thus, in particular, a large amount of steam can be continuously provided over a long period of time.

LIST OF REFERENCE NUMBERS

100

 Steam supply device

102

 Pressurized water storage tank

102

 first pressurized water storage tank

102b

 second pressurized water storage tank

102c

 third pressurized water storage tank

104

 Ruth memory

106

 Heat storage device

108

 heat source

110

 Heat transfer device

112

 Transmission fluid guide

114

 fan

116

 Heat exchanger

118

 Solid heat storage

120

 storage container

122

 storage medium

124

 water supply

126

 reservoir means

128

 pump device

130

 heater

132

 Valve

134

 Steam export

136

 equalization valve

Claims (16)

Steam delivery device ( 100 ) for providing steam, in particular saturated steam, comprising: - a heat storage device ( 106 ); - several pressurized water storage tanks ( 102 ); A water supply ( 124 ) for supplying water to the pressurized water storage tanks ( 102 ); A heat transfer device ( 110 ), by means of which optionally one or more pressurized water storage tanks ( 102 ) Heat from the heat storage device ( 106 ) can be fed. Steam delivery device ( 100 ) according to claim 1, characterized in that the pressurized water storage tank ( 102 ) Ruth memory ( 104 ) are. Steam delivery device ( 100 ) according to one of claims 1 or 2, characterized in that the heat storage device ( 106 ) one or more solid heat storage ( 118 ). Steam delivery device ( 100 ) according to one of claims 1 to 3, characterized in that the heat transfer device ( 110 ) a transfer fluid guide ( 112 ) by means of which a heat transfer fluid from the heat storage device ( 106 ) to the pressurized water storage tanks ( 102 ) can be fed. Steam delivery device ( 100 ) according to claim 4, characterized in that at least one storage container ( 120 ) of the heat storage device ( 106 ) can be flowed through by the heat transfer fluid, so that in particular by direct contact between the heat transfer fluid and a storage medium ( 122 ) of the heat storage device ( 106 ) Heat from the storage medium ( 122 ) is transferable to the heat transfer fluid. Steam delivery device ( 100 ) according to one of claims 4 or 5, characterized in that the heat transfer fluid and the water of the pressurized water storage tank ( 102 ) are mutually different fluids and / or are guided spatially separated from each other. Steam delivery device ( 100 ) according to one of claims 1 to 6, characterized in that the pressurized water storage tanks ( 102 ) by means of the water supply ( 124 ) liquid water can be supplied. Steam delivery device ( 100 ) according to any one of claims 1 to 7, characterized in that the steam delivery device ( 100 ) a heating device ( 130 ) for heating the pressurized water storage tanks ( 102 ) water to be supplied. Steam delivery device ( 100 ) according to one of claims 1 to 8, characterized in that the steam supply device ( 100 ) comprises a heat buffer device, by means of which heat from one or more pressurized water storage tanks ( 102 ) is cacheable. Steam delivery device ( 100 ) according to claim 9, characterized in that the heat buffering device comprises a plurality of storage elements or storage sections for storing heat at different temperature levels. Method for providing steam, in particular saturated steam, comprising: - storing heat by means of a heat storage device ( 106 ); Feeding water to pressurized water storage tanks ( 102 ) by means of a water supply ( 124 ); Transfer of heat from the heat storage device ( 106 ) to one or more pressurized water storage tanks ( 102 ); Removal of steam, in particular saturated steam, from at least one pressurized water storage tank ( 102 ). A method according to claim 11, characterized in that the heat by means of a heat transfer fluid from the heat storage device ( 106 ) to the one or more pressurized water storage tanks ( 102 ) is transmitted. Method according to claim 12, characterized in that at least one storage container ( 120 ) of the heat storage device ( 106 ) is flowed through by the heat transfer fluid, so that in particular by direct contact between the heat transfer fluid and a storage medium ( 122 ) of the heat storage device ( 106 ) Heat from the storage medium ( 122 ) is transferred to the heat transfer fluid. Method according to one of claims 11 to 13, characterized in that substantially simultaneously a) one or more pressurized water storage tanks ( 102 ) Water is supplied and / or b) water in one or more further pressurized water storage tanks ( 102 ) and / or c) steam, in particular saturated steam, from one or more further pressurized water storage tanks ( 102 ) is taken. Method according to one of claims 11 to 14, characterized in that the water in the pressurized water storage tanks ( 102 ) in a loaded state of the pressurized water storage tank ( 102 ) has a temperature of at least about 250 ° C and / or a pressure of at least about 30 bar. Method according to one of claims 11 to 15, characterized in that the steam, in particular the saturated steam, after removal from the at least one pressurized water storage tank ( 102 ) is overheated, in particular by supplying heat from the heat storage device ( 106 ) on the extracted steam.

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