DE102011083067B4 - Heat transfer fluid transport line for a solar power plant, solar power plant with the heat transfer transport line and method for operating the solar power plant - Google Patents

Abstract

A heat transfer fluid transport line for a solar power plant for guiding a heat transfer fluid flow of the heat transfer fluid away from at least one equalizing tank to at least one steam generator unit is specified. The heat transfer fluid transport line has the following elements: at least one pump arranged downstream of the expansion tank, at least one valve arranged downstream after the pump, at least one additional boiler arranged downstream after the valve for generating an additionally heated auxiliary boiler heat transfer fluid total flow and at least one downstream of the additional boiler, additional boiler distributor device for supplying part of the additionally heated auxiliary boiler heat transfer fluid total flow to the evaporator unit and for supplying a further part of the additionally heated auxiliary boiler heat transfer fluid flow to the expansion tank. There are preferably several heat transfer fluid sub-lines. The heat transfer fluid sub-lines are designed so that both the supply of heat transfer fluid to the solar field and also a supply to additional boilers is possible with a pump and a valve. This means that further pumps and valves for controlling and regulating the respective heat transfer fluid partial flows can be dispensed with.

Description

The invention relates to a heat transfer fluid transport line for a solar power plant, a solar power plant with the heat transfer fluid transport line and a method for operating the solar power plant.

In a solar power plant based on the CSP (Concentrated Solar Power) technology, solar energy is converted into thermal energy. The thermal energy is used to generate electrical power.

The solar power plant is, for example, a parabolic trough solar power plant, as is DE 20 2008 002 599 U1 is known. In such a parabolic trough solar power plant, a heat transfer fluid, for example a molten salt or a thermal oil, is passed through absorber tubes in a solar field for receiving the solar energy. The absorber tubes are arranged in focal lines of parabolic mirrors. The parabolic mirrors concentrate the sunlight towards the focal lines. There, the sunlight is absorbed by the absorber tubes and transmitted in the form of thermal energy to the heat transfer fluid, which is located in the absorber tubes. The heat transfer fluid is heated.

The heated heat transfer fluid is passed via heat transfer fluid transport lines directly to a steam generator unit. In addition, an expansion tank (expansion tank) is present in the heat transfer fluid circuit. The surge tank is used, inter alia, to take after passing through the steam generator unit cooled heat transfer fluid and provide heat transfer fluid for supply to the solar panel for receiving solar energy. In addition, a portion of the cooled heat transfer fluid of the same container after heating by means of additional boiler can be returned to the steam generator unit.

In the steam generator unit, steam is generated with the aid of the heated heat transfer fluid, which is used to generate electricity by means of a steam turbine and generator.

The heat transfer fluid transport line used to transport the heat transfer fluid consists of a plurality of different sections. In these different sections sometimes very different pressure conditions prevail. For example, the pressure in the region in which the heat transfer fluid is passed through the absorber tubes, relatively high. In contrast, the pressure that occurs in heat exchangers of the steam generator unit, comparatively low.

In order to ensure a transport of the heat transfer fluid taking into account different pressure conditions of the different areas of the heat transfer fluid transport line, a variety of pumps and valves is necessary. This is very expensive and expensive.

The object of the present invention is to show how a heat transfer fluid transport line of a solar power plant is to be equipped in order to ensure transport of the heat carrier fluid and to keep a necessary effort as low as possible.

To achieve the object, a heat transfer fluid transport line for a solar power plant for directing a heat transfer fluid flow of the heat transfer fluid from at least one surge tank is given away towards at least one steam generator unit. The heat transfer fluid transport line comprises the following elements: at least one downstream of the surge tank arranged pump, at least one valve downstream of the pump, at least one downstream of the valve arranged additional boiler for generating an additional heated auxiliary boiler heat transfer fluid total flow and at least one downstream of the auxiliary boiler arranged additional boiler distributor device for supplying a portion of the additionally heated auxiliary boiler heat transfer fluid total flow to the evaporator unit and for supplying a further portion of the additionally heated auxiliary boiler heat transfer fluid flow to the surge tank.

A portion of the additionally heated auxiliary boiler heat transfer fluid total flow can be passed to the evaporator unit and is thus directly available for steam generation. The further part of the additionally heated auxiliary boiler heat transfer fluid total flow can be directed to the expansion tank.

According to a particular embodiment, the heat transfer fluid transport line at least one downstream of the surge tank and arranged in front of the pump, the first distributor device for dividing the heat transfer fluid transport line in a heat transfer fluid transport line and in at least one further heat transfer fluid transport line in which the heat transfer fluid transport sub-line for generating a set heat transfer fluid sub-stream in the heat transfer fluid transport sub-line comprises the pump and the valve, the further heat transfer fluid transport sub-line for generating a further set heat transfer fluid sub-stream in the further heat transfer fluid Transport sub-line another pump and another Valve, downstream of the heat transfer fluid transport sub-lines at least a first collector device for merging the set heat transfer fluid substreams to a set total heat transfer fluid flow is arranged downstream of the first collector device at least one second distribution device for dividing the set heat transfer fluid total flow to an auxiliary boiler -Wärmeträgerfluid-Teilstrom and is arranged on at least one other auxiliary boiler heat transfer fluid partial flow, the auxiliary boiler heat transfer fluid partial flow can be supplied to the auxiliary boiler for generating an additional heated auxiliary boiler heat transfer fluid partial flow, the additional auxiliary boiler heat transfer fluid partial flow at least one additional additional boiler for generating a further additionally heated auxiliary boiler heat transfer fluid partial flow can be supplied, downstream of the boilers at least one Zusatzke An accumulator assembly for combining the additionally heated auxiliary boiler heat transfer fluid substreams to the additionally heated auxiliary boiler heat transfer fluid total stream is disposed and downstream of the auxiliary boiler accumulator device, the auxiliary boiler distribution device is arranged.

To solve the problem, a solar power plant for converting solar energy into electrical energy is specified with at least one described heat transfer transport line, wherein the heat transfer fluid can be passed through the heat transfer transport line.

• a) Zuleiten eines Wärmeträgerfluid-Stroms des Wärmeträgerfluids von mindestens einem Ausgleichsbehälter weg hin zu mindestens einer Dampferzeuger-Einheit,
• b) Erzeugen von Wasserdampf in der Dampferzeuger-Einheit mit Hilfe des Wärmeträgerfluid-Stroms und
• c) Erzeugen von elektrischem Strom mit Hilfe des Wasserdampfs.

In addition, to solve the problem, a method for operating the solar power plant is specified with the following process steps:

• a) supplying a heat carrier fluid flow of the heat transfer fluid from at least one expansion tank towards at least one steam generator unit,
• b) generating water vapor in the steam generator unit by means of the heat transfer fluid flow and
• c) generating electrical current with the aid of water vapor.

According to a particular embodiment, during a start-up phase of the solar power plant, the further part of the additionally heated auxiliary boiler heat transfer fluid total flow is directed to the surge tank and directed in a Regelbetriebsphase the solar power plant, the part of the additional heated auxiliary boiler heat transfer fluid total flow to the steam generator unit.

If there are several heat transfer fluid transport sub-lines, these are connected in parallel. Likewise, if necessary, several, additionally heated auxiliary boiler heat transfer fluid partial flows are connected in parallel. Preferably, a plurality of parallel-connected heat transfer fluid transport sub-lines and a plurality of parallel, additionally heated auxiliary boiler heat transfer fluid sub-streams are present.

The valves used are, for example, throttle valves. For each heat carrier fluid transport subline, several valves and a plurality of pumps may be provided. Basically, however, due to the interconnection of the various elements of the heat transfer fluid transport line per heat transfer fluid transport subline in each case one pump and one valve is sufficient.

Additional pumps and valves may be provided to control the additionally heated auxiliary boiler heat transfer fluid substreams. However, this is not necessary due to the structure of the heat transfer fluid transport line.

According to a particular embodiment, between the pump and the valve is a branch for supplying a branched part of the heat transfer fluid partial flow to a solar field of the solar power plant and / or between the further pump and the further valve another branch for supplying a further branched part of the further heat transfer fluid Partial current arranged to the solar field of the solar power plant. This also preferably applies to several or all heat transfer fluid transport sub-lines. According to a particular embodiment, therefore, at least two of the heat transfer fluid transport sub-lines have branches between the respective pump and the respective valve. In addition, a branch collector device for merging the branched parts of the heat transfer fluid flow is present. The merged (branched) parts of the heat transfer fluid partial streams are returned to the solar field for receiving thermal energy.

According to a further embodiment, at least one valve for adjusting the respectively branched off part of the respective heat transfer fluid partial flow is present in at least one of the heat transfer fluid transport partial lines between the respective branch and the branch collecting device. This makes it possible to control the partial flows of the heat transfer fluid in the direction of the solar field.

Use finds the heat transfer fluid transport line in a heat transfer fluid circuit of a solar power plant. According to a particular embodiment of the solar power plant is a feed device for feeding the part of the additional heated auxiliary boiler Heat transfer fluid total flow in a solar field heat transfer fluid stream coming directly from the solar field. Heat transfer fluid coming from the solar field and heat transfer fluid heated by the auxiliary boilers are mixed and passed to the steam generator unit to produce the water vapor.

• – Durch den Aufbau der Wärmeträgerfluid-Transport-Leitung ist dafür gesorgt, dass ein geregelter Transport des Wärmeträgerfluids durch die Wärmeträgerfluid-Transport-Leitung trotz der sehr unterschiedlichen Druckverhältnisse möglich ist.
• – Der geregelte Transport ist durch den Einsatz einfacher Mittel gewährleistet.
• – Die Anzahl der eingesetzten Ventile ist minimal, sodass ein durch den Transport hervorgerufener Verlust minimiert ist.
• – Auch die Anzahl der eingesetzten Pumpen ist begrenzt. Dadurch reduzieren sich die mit dem Einsatz der Wärmeträgerfluid-Transport-Leitung einhergehenden Kosten.

In summary, the following advantages are associated with the invention:

• - Due to the structure of the heat transfer fluid transport line is ensured that a controlled transport of the heat transfer fluid through the heat transfer fluid transport line despite the very different pressure conditions is possible.
• - The regulated transport is ensured by the use of simple means.
• - The number of valves used is minimal, so that a loss caused by the transport is minimized.
• - The number of pumps used is limited. This reduces the costs associated with the use of the heat transfer fluid transport line.

Reference to an embodiment and the accompanying figure, the invention will be described in more detail below. The figure is schematic.

The figure shows the construction of a solar power plant with a heat transfer fluid transport line.

Given is a heat transfer fluid transport line 11 for a solar power plant 1 for conducting a heat transfer fluid stream 21 the heat transfer fluid 2 from an expansion tank 10 away to a steam generator unit 3 , The steam generator unit has a heat exchanger for generating steam (water vapor). The heat transfer fluid is a thermal oil. In an alternative embodiment, the heat transfer fluid is a molten salt.

The heat transfer fluid transport line 11 has a downstream to the surge tank 10 arranged, first distributor device 113 for dividing the heat transfer fluid transport line 11 in several, parallel interconnected heat transfer fluid transport sub-lines 111 . 112 on.

The heat transfer fluid transport subline 111 has for generating a set heat transfer fluid partial flow 1113 a pump 1111 and a valve 1112 on.

The further heat transfer fluid transport sub-line 112 has for generating a further set heat transfer fluid partial flow 1123 another pump 1121 and another valve 1122 on.

For each of the heat transfer fluid transport sub-lines 111 and 112 is the respective valve 1112 and 1122 downstream to the respective pump 1111 and 1121 arranged.

In the heat transfer fluid transport sub-lines 111 and 112 is in each case between the respective pump 1111 and 1121 and the respective valve 1112 and 1122 a turnoff 1113 respectively. 1123 for supplying a branched part 1114 and 1124 of the heat transfer fluid stream to the solar field 4 of the solar power plant 1 available.

In addition, a branch collector device 1130 for merging the branched parts 1114 and 1124 the heat transfer fluid stream present. The merged part can be the solar field 4 be supplied.

Between the respective branch 1113 respectively. 1123 and the branch collector device 1130 one valve each 1115 respectively. 1125 arranged for adjusting the respective branched off part of the heat transfer fluid partial flow.

The additional, parallel to the two described heat transfer fluid transport sub-lines heat transfer fluid transport sub-lines are constructed accordingly.

Downstream of the heat transfer fluid transport sub-lines 111 and 112 is a first collector device 114 for merging the set heat transfer fluid partial flows 1113 and 1123 to a set heat transfer fluid total flow 120 available.

Downstream of the first collector device 114 is a second distribution device 115 for splitting the set heat transfer fluid total flow 120 to several auxiliary boiler heat transfer fluid partial flows 121 and 122 available.

Each of the auxiliary boiler heat transfer fluid substreams 121 and 122 can each have an additional boiler 1201 and 1211 for generating a respective additionally heated auxiliary boiler heat transfer fluid substream 1202 and 1212 be supplied.

After the additional boilers 1201 and 1211 downstream is an auxiliary boiler collector device 117 for merging the additionally heated auxiliary boiler heat transfer fluid substreams 1202 and 1212 to an additionally heated auxiliary boiler heat transfer fluid total flow 130 available.

Downstream of the auxiliary boiler collector device 117 is an auxiliary boiler distributor device 118 for supplying a part 1301 the additionally heated auxiliary boiler heat transfer fluid total flow 130 to the steam generator unit 3 and for supplying another part 1302 the additionally heated auxiliary boiler heat transfer fluid total flow 130 to the expansion tank 10 available.

The heat transfer fluid transport line 11 is in a solar power plant 1 used. In addition, there is a feed device 141 for feeding the part 1301 the additionally heated auxiliary boiler heat transfer fluid total flow 130 in the regular operation phase of the solar power plant in one directly from the solar field 4 upcoming solar field heat transfer fluid stream 140 available. Both become a steam generator unit 3 forwarded and is the steam generation available. In the start-up phase of the solar power plant is the other part 1302 the additionally heated auxiliary boiler heat transfer fluid total flow 130 to the expansion tank 10 directed.

Claims (9)

Heat transfer fluid transport line ( 11 ) for a solar power plant ( 1 ) for conducting a heat transfer fluid flow of the heat transfer fluid ( 2 ) of at least one expansion tank ( 10 ) away to at least one steam generator unit ( 3 ), comprising - at least one downstream of the surge tank ( 10 ) arranged pump ( 1111 ), - at least one downstream of the pump ( 1111 ) arranged valve ( 1112 ), - at least one downstream of the valve ( 1112 ) arranged additional boiler ( 1201 ) for generating an additionally heated auxiliary boiler heat transfer fluid total flow ( 130 ) and - at least one downstream to the auxiliary boiler ( 1201 ) arranged auxiliary boiler distributor device ( 118 ) for supplying a part ( 1301 ) of the additionally heated auxiliary boiler heat transfer fluid total flow ( 130 ) to the evaporator unit ( 3 ) and for the delivery of another part ( 1302 ) of the additionally heated auxiliary boiler heat transfer fluid stream ( 130 ) to the expansion tank ( 10 ). Heat transfer fluid transport line according to claim 1, comprising at least - one downstream of the surge tank ( 10 ) and in front of the pump ( 111 ), the first distributor device ( 113 ) for dividing the heat transfer fluid transport line ( 11 ) in a heat transfer fluid transport line ( 111 ) and in at least one further heat transfer fluid transport sub-line ( 112 ), wherein - the heat transfer fluid transport sub-line ( 111 ) for generating a set heat transfer fluid partial flow ( 1131 ) in the heat transfer fluid transport line ( 111 ) the pump ( 1111 ) and the valve ( 1112 ), - the further heat transfer fluid transport sub-line ( 112 ) for generating a further set heat transfer fluid partial flow ( 1132 ) in the further heat transfer fluid transport sub-line ( 112 ) another pump ( 1121 ) and another valve ( 1122 ), downstream of the heat transfer fluid transport sub-lines ( 111 . 112 ) at least one first collector device ( 114 ) for merging the set heat transfer fluid partial flows ( 1131 . 1132 ) to a set heat transfer fluid total flow ( 120 ) is arranged downstream of the first collecting device ( 114 ) at least one second distributor device ( 115 ) for splitting the set heat transfer fluid total flow ( 120 ) to an auxiliary boiler heat transfer fluid substream ( 121 ) and at least one additional auxiliary boiler heat transfer fluid partial flow ( 122 ), - the auxiliary boiler heat transfer fluid partial flow ( 121 ) the additional boiler ( 1201 ) for producing an additionally heated auxiliary boiler heat transfer fluid substream ( 1202 ) can be supplied, - the additional auxiliary boiler heat transfer fluid partial flow ( 122 ) at least one additional auxiliary boiler ( 1211 ) for producing a further additionally heated auxiliary boiler heat transfer fluid substream ( 1202 ), - downstream to the auxiliary boilers ( 1201 . 1211 ) at least one auxiliary boiler collector device ( 117 ) for merging the additionally heated auxiliary boiler heat transfer fluid substreams ( 1202 . 1212 ) to the additionally heated auxiliary boiler heat transfer fluid total flow ( 130 ) and - downstream of the auxiliary boiler collector device ( 117 ) the auxiliary boiler distributor device ( 118 ) is arranged. Heat transfer transport line according to claim 1 or 2, wherein between the pump ( 1111 ) and the valve ( 1112 ) a branch ( 1113 ) for supplying a branched part ( 1114 ) of the heat transfer fluid substream to a solar field ( 4 ) of the solar power plant ( 1 ) and / or between the further pump ( 1121 ) and the further valve ( 1122 ) another branch ( 1123 ) for supplying another branched part ( 1124 ) of the further heat transfer fluid substream to the solar field ( 4 ) of the solar power plant ( 1 ) is arranged. Heat transfer transport line according to claim 3, wherein at least two of the heat transfer fluid transport sub-lines ( 111 . 112 ) Branches ( 1113 . 1114 ) between the respective pump ( 1111 . 1121 ) and the respective valve ( 1112 . 1122 ) and a branch collector device ( 1130 ) for merging the respective branched parts ( 1114 . 1124 ) of the respective heat transfer fluid partial flow is present. Heat transfer transport line according to claim 3 or 4, wherein at least one of the heat transfer fluid transport sub-lines between the respective branch ( 1113 . 1123 ) and the branch collector device ( 1130 ) at least one valve ( 1115 . 1125 ) is present for adjusting the respective branched part of the respective heat transfer fluid partial flow. Solar power plant for converting solar energy into electrical energy with at least one heat carrier transport line according to one of claims 1 to 5, wherein the heat transfer fluid can be passed through the heat transfer medium transport line. Solar power plant according to claim 6, wherein a feeding device ( 141 ) for feeding the part ( 1301 ) of the additionally heated auxiliary boiler heat transfer fluid total flow ( 130 ) in one directly from the solar field ( 4 ) coming solar field heat transfer fluid stream ( 140 ) is available. Method for operating the solar power plant according to claim 6 or 7 with the following method steps: a) supplying a heat transfer fluid stream of the heat transfer fluid from at least one compensation tank ( 10 ) away to at least one steam generator unit ( 3 ), b) generating water vapor in the steam generator unit ( 3 ) with the aid of the heat transfer fluid stream and c) generating electrical current with the aid of the steam. Method according to claim 8, wherein during a start-up phase of the solar power plant the further part ( 1302 ) of the additionally heated auxiliary boiler heat transfer fluid total flow ( 130 ) to the expansion tank ( 10 ) and, in a regular operation phase of the solar power plant, the 1301 ) of the additionally heated auxiliary boiler heat transfer fluid total flow ( 130 ) is passed to the steam generator unit.

Images