CN109442770A - A kind of control method improving collecting system collecting efficiency - Google Patents
A kind of control method improving collecting system collecting efficiency Download PDFInfo
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- CN109442770A CN109442770A CN201710771906.7A CN201710771906A CN109442770A CN 109442770 A CN109442770 A CN 109442770A CN 201710771906 A CN201710771906 A CN 201710771906A CN 109442770 A CN109442770 A CN 109442770A
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- temperature
- heat collector
- molten salt
- control method
- collecting
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/40—Solar thermal energy, e.g. solar towers
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Abstract
The invention discloses a kind of control methods for improving collecting system collecting efficiency, when the heat that heat collector absorbs is excessively high, this method enters the flow rate of molten salt of heat collector by adjusting cold salt cellar, the temperature of molten salt control in least significant end heat collector exit in collecting system is on the verge of in the temperature range of system maximum temperature value close, so that entire collecting system is carried out thermal-arrest work in a manner of close to maximum efficiency, avoids least significant end heat collector and be forced to mistake caused by defocusing and the problem of wasting manpower and material resources；When flow rate of molten salt, which reaches maximum, still can not absorb whole solar heats, angle between reflecting mirror and the sun of this method by adjusting heat collector, heat collector is set to generate solar tracking deviation, although wasting the heat of a part of sun, but entire collecting system is made to carry out the collection of heat with peak efficiency, and the problems such as therefore not causing the mistake high load of system or heat collector delay machine to damage.
Description
Technical field
The invention belongs to solar energy heating power field more particularly to a kind of controlling parties for improving collecting system collecting efficiency
Method.
Background technique
Collecting system herein refers to that the system that can be carried out the power generation of photo-thermal thermal-arrest using the sun, whole system include collection
Thermal, the fused salt circulatory system, heat-exchange system and power generator etc., the heat collector i.e. the part Jing Chang are by 8 groups of thermal-arrests
Device (SCA) composition, every group of heat collector (SCA) overall length 100m, heat collector are made of heat collection unit (SCE) and its associated component,
In, heat collection unit (SCE) is by thermal-collecting tube, reflecting plate, support construction and four part of tracking and driving system composition.Heat collector (SCA)
The solar focusing on its surface will be radiated to thermal-collecting tube by reflecting plate, to realize that solar energy and heat-carrying squeeze the energy between thermal energy
Measure conversion process.Thermal-collecting tube is arranged at the focal line of parabolic shape reflecting plate.It is circulated in thermal-collecting tube for absorbing heat and conducting heat
Fused salt, the purpose of entire collecting system be that these fused salts are heated into high-temperature molten salt using solar energy, and in heat-exchange system
By exchanging heat with water, superheated steam is generated, superheated steam generates steam after pressure and temperature reducing and enters steam turbine acting, final logical
Cross pushing generator acting power generation.
8 groups of heat collectors are sequentially connected, and are connected between every two groups of heat collectors by hose, and fused salt is flowed out from cold salt cellar again from 1
Number thermal-collecting tube successively passes through 2,3,4...7 thermal-collecting tube flow to No. 8 thermal-collecting tubes, be respectively provided in the inlet and outlet of each thermal-collecting tube
There is temperature measuring device, monitors the temperature of fused salt.
During actually carrying out the power generation of photo-thermal thermal-arrest, there are such problems: when detecting No. 8 thermal-collecting tube exits
Temperature of molten salt (be on the verge of system maximum temperature) when reaching 550 degrees Celsius, No. 8 heat collectors can be forced to defocus, and when detecting No. 8
When the temperature of molten salt in thermal-collecting tube exit reaches 560 degrees Celsius (system maximum temperature), 8 groups of all heat collectors can all execute scattered
Coke operates so that temperature of molten salt no longer persistently increases, and forces caused by defocusing the result is that entire collecting system cannot carry out for a long time
The collecting efficiency of solar tracking, system is greatly reduced, and in order to overcome the problems, such as this, needs a set of entire collecting system thermal-arrest to can be improved
The control method of efficiency.
Summary of the invention
The present invention overcomes the disadvantages of the prior art, provides a kind of controlling party for improving collecting system collecting efficiency
Method.
In order to solve the above-mentioned technical problem, the present invention is achieved by the following technical solutions:
A kind of control method improving collecting system collecting efficiency, this method are divided into two parts:
A kind of control method improving collecting system collecting efficiency, it is characterised in that: this method is divided into two parts:
First part: enter the flow rate of molten salt of heat collector by adjusting cold salt cellar, by least significant end heat collector in collecting system
The temperature of molten salt in exit controls the temperature range in early warning temperature T0 and super early warning temperature T2, and the system maximum temperature value of being on the verge of is
Least significant end heat collector is forced to execute the temperature value defocused in collecting system, and collecting system is allow to carry out lasting solar tracking thermal-arrest；
Second part: reach system maximum stream flow in the flow rate of molten salt that cold salt cellar enters heat collector, least significant end heat collector goes out
Temperature of molten salt at mouthful is more than to be on the verge of system maximum temperature value, and still when continuing to increase, pass through the reflecting mirror of adjusting heat collector
Angle between the sun, makes heat collector generate solar tracking deviation, which is -10 ° to+10 °.
Moreover, the super early warning temperature T2 is to be on the verge of system maximum temperature value to subtract 10 DEG C, early warning temperature T0 be on the verge of be
System maximum temperature value subtracts 30 DEG C.
Moreover, in the control method of first part, when detecting the molten of least significant end heat collector exit in collecting system
When salt temperature reaches intermediate early warning temperature T1, increases the flow rate of molten salt that cold salt cellar enters heat collector, increase the 5%- of existing flow
After 10%, the temperature of molten salt for persistently recording least significant end heat collector exit maintains existing stream if temperature of molten salt no longer increases
Amount, if temperature of molten salt persistently rises, continue growing the 5%-10% of existing flow, until temperature of molten salt early warning temperature T0 extremely
It is no longer increased in the temperature range of super early warning temperature T2.
The intermediate early warning temperature T1 is to be on the verge of system maximum temperature value to subtract 20 DEG C.
Moreover, in the control method of first part, when detecting the molten of least significant end heat collector exit in collecting system
When salt temperature reaches super early warning temperature T2, increases the flow rate of molten salt that cold salt cellar enters heat collector, increase the 10%- of existing flow
After 20%, the temperature of molten salt in least significant end heat collector exit is persistently recorded, if temperature of molten salt revert to early warning temperature T0 to super pre-
The temperature range of alert temperature T2, then maintain existing flow, if temperature of molten salt persistently rises, continue growing existing flow
10%-20%, until temperature of molten salt maintains the temperature range of T0-T2；
Moreover, in the control method of second part, when adjusting the reflecting mirror of the heat collector, according to the collection from end
Hot device starts the mode being successively adjusted.
Moreover, the solar tracking deviation is -5 ° to+5 ° in the control method of second part.
Compared with prior art, the beneficial effects of the present invention are:
First part, when the heat that heat collector absorbs is excessively high, this method enters melting for heat collector by adjusting cold salt cellar
The temperature of molten salt control in least significant end heat collector exit in collecting system is on the verge of system maximum temperature value close by salt flow
In temperature range, so that entire collecting system is carried out thermal-arrest work in a manner of close to maximum efficiency, avoid least significant end
Heat collector is forced to mistake caused by defocusing and the problem of wasting manpower and material resources；
Second part, when flow rate of molten salt reach it is maximum still can not absorb whole solar heats when, this method passes through adjusting
Angle between the reflecting mirror and the sun of heat collector makes heat collector generate solar tracking deviation, although wasting the heat of a part of sun
Amount, but so that entire collecting system is carried out the collection of heat with peak efficiency, and therefore do not cause the mistake high load of system, or
The problems such as heat collector delay machine is damaged.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of collecting system in the present invention.
Wherein, 1 is No. 1 heat collector, and 2 be No. 8 heat collectors, and 3 be cold salt cellar pipeline, and 4 be hot salt cellar by-pass valve, and 5 be cold
Salt cellar return valve, 6 be heat-exchanger rig, and 7 be cold salt cellar, and 8 be hot salt cellar, and 9 be the first leakage salt device, and 10 be the second leakage salt dress
It sets, 11 leak salt device for third, and 12 be the 4th leakage salt device.
Specific embodiment
Present invention is further described in detail with specific embodiment with reference to the accompanying drawing:
A kind of control method improving collecting system collecting efficiency, this method are divided into two parts:
First part: enter the flow rate of molten salt of heat collector by adjusting cold salt cellar, by least significant end heat collector in collecting system
The temperature of molten salt in exit controls the temperature range in T0-T2, and the T2=is on the verge of -10 DEG C of system maximum temperature value, and T0=is on the point of
Face -30 DEG C of system maximum temperature value, be on the verge of system maximum temperature value be collecting system in least significant end heat collector be forced execute defocus
Temperature value, so that collecting system is carried out lasting solar tracking thermal-arrest；Specifically:
When the temperature of molten salt for detecting least significant end heat collector exit in collecting system reaches T1, the temperature value of the T1
=it is on the verge of -20 DEG C of system maximum temperature value, increase the flow rate of molten salt that cold salt cellar enters heat collector, increases the 5%- of existing flow
After 10%, the temperature of molten salt for persistently recording least significant end heat collector exit maintains existing stream if temperature of molten salt no longer increases
Amount, if temperature of molten salt persistently rises, continues growing the 5%-10% of existing flow, until temperature of the temperature of molten salt in T0-T2
It is no longer increased in section；
When the temperature of molten salt for detecting least significant end heat collector exit in collecting system reaches T2, the T2=be on the verge of be
- 10 DEG C of maximum temperature value of system, increases the flow rate of molten salt that cold salt cellar enters heat collector, after the 10%-20% for increasing existing flow, holds
The temperature of molten salt in continuous record least significant end heat collector exit remains existing if temperature of molten salt revert to the temperature range of T0-T2
Flow continues growing the 10%-20% of existing flow if temperature of molten salt persistently rises, until temperature of molten salt maintains T0-T2
Temperature range；
Second part: reach system maximum stream flow in the flow rate of molten salt that cold salt cellar enters heat collector, least significant end heat collector goes out
Temperature of molten salt at mouthful is more than to be on the verge of system maximum temperature value, and still when continuing to increase, pass through the reflecting mirror of adjusting heat collector
Angle between the sun makes heat collector generate solar tracking deviation, i.e. heat collector is collected in a manner of being less than maximum collecting efficiency
Thermal technology makees, which is -10 ° to+10 °.
It in the above-mentioned technical solutions, is preferably -5 ° to+5 ° in second part solar tracking deviation.
Embodiment 1:
For the present embodiment by taking the collecting system of thermal-arrest light field where applicant as an example, which includes heat collector, fused salt
The circulatory system, heat-exchange system and power generator etc., the heat collector are made of 8 groups of heat collectors (SCA), every group of heat collector
(SCA) overall length 100m, heat collector are made of heat collection unit (SCE) and its associated component, wherein heat collection unit (SCE) is by thermal-arrest
Pipe, reflecting plate, support construction and four part of tracking and driving system composition.
Entire collecting system includes: No. 1 to No. 8 heat collector, hot salt cellar by-pass valve, the reflux of cold salt cellar as described in Fig. 1
Valve, heat-exchanger rig, cold salt cellar, hot salt cellar and leakage salt device etc., whole system can produce 560 DEG C of high-temperature molten salt, by with
Water heat exchange (heat transfer process occurs in the heat-exchanger rig), generates the superheated steam of 535 DEG C, 7.2MPa, and superheated steam passes through
Parameter is generated after pressure and temperature reducing and enters steam turbine acting for the qualified steam of 340 DEG C, 0.8MPa, is then done by pushing generator
Function power generation.
Fused salt is flowed out from cold salt cellar enters heat collector through supercooling salt pipeline, and the working flow of schedule maintains 1100-1300
Kg/hr, minimum discharge is 780 kgs/hr, when the temperature-detecting device being located at heat collector detects the upper of heat collector
When the fused salt in downstream generates temperature difference, illustrate that heat collector heats fused salt in the heat for collecting solar energy, when No. 8 heat collectors
When the temperature-detecting device of end detects that the temperature of fused salt reaches 400 DEG C or more, then hot salt cellar by-pass valve is opened, closed cold
Salt cellar return valve makes fused salt enter hot salt cellar, executes subsequent heat exchange and generation steps；
The i.e. urgent temperature value defocused that executes of system maximum temperature value that is on the verge of of No. 8 heat collectors in this embodiment is taken the photograph for 550
Family name's degree, therefore when No. 8 heat collector outlet temperatures are at 530 DEG C, the flow of cold salt pump to heat collecting field is controlled to adjust, is adjusted every time
Double centner/hour is saved, the temperature of molten salt of No. 8 heat collectors of monitoring outlet is then proceeded to, until temperature is controlled in 520 DEG C and 540 DEG C
Between.
Embodiment 2:
Device in the embodiment is identical as collecting system described in embodiment 1.
The i.e. urgent temperature value defocused that executes of system maximum temperature value that is on the verge of of No. 8 heat collectors in this embodiment is taken the photograph for 550
Family name's degree controls to adjust the flow of cold salt pump to heat collecting field when No. 8 heat collector outlet temperatures are at 540 DEG C, adjusts every time
200 kgs/hr, then proceed to monitoring No. 8 heat collectors outlet temperature of molten salt, until temperature control 520 DEG C with 540 DEG C it
Between.
Embodiment 3:
Device in the embodiment is identical as collecting system described in embodiment 1.
The i.e. urgent temperature value defocused that executes of system maximum temperature value that is on the verge of of No. 8 heat collectors in this embodiment is taken the photograph for 550
Family name's degree when No. 8 heat collector outlet temperatures are more than 550 DEG C, and controls to adjust the flow of cold salt pump to heat collecting field, every time
500 kgs/hr are adjusted, after adjusting repeatedly, flow has reached 2500 kgs/hr, and 2500 kgs/hr have been this system
The maximum value of middle flow rate of molten salt monitors the temperature of molten salt of No. 8 heat collectors outlet, and the temperature is always more than 540 DEG C, and in 540-
It is maintained in 550 DEG C of sections, No. 8 heat collectors will execute to be defocused automatically, controls upper " instruction of SCA solar tracking deviation " in heat collector at this time
The angle value of one+10 ° of input.If (for mirror towards east, 1-4 SCA inputs a deviation negative value, and 5-8 SCA inputs one
Deviation positive value, the angular range of deviation is at -10 °~+10 °), the temperature of molten salt of No. 8 heat collectors outlet at this time is by 540-550 DEG C
Temperature range gradually decreases down the temperature range of 520 DEG C with 540 DEG C, and entire collecting system maintains high efficiency to carry out collection thermal process, and 8
Number heat collector avoids execution and defocuses automatically.
It describes the invention in detail, but content is only the preferred embodiment of the present invention, cannot be recognized above
For for limiting practical range of the invention.Any changes and modifications in accordance with the scope of the present application should all still return
Belong within patent covering scope of the invention.
Claims (7)
1. a kind of control method for improving collecting system collecting efficiency, it is characterised in that: this method is divided into two parts:
First part: enter the flow rate of molten salt of heat collector by adjusting cold salt cellar, least significant end heat collector in collecting system is exported
In the temperature range of early warning temperature T0 and super early warning temperature T2, being on the verge of system maximum temperature value is thermal-arrest for the temperature of molten salt control at place
Least significant end heat collector is forced to execute the temperature value defocused in system, and collecting system is allow to carry out lasting solar tracking thermal-arrest；
Second part: reach system maximum stream flow, least significant end heat collector exit in the flow rate of molten salt that cold salt cellar enters heat collector
Temperature of molten salt be more than to be on the verge of system maximum temperature value, and still when continuing to increase, by adjust the reflecting mirror of heat collector with too
Angle between sun, makes heat collector generate solar tracking deviation, which is -10 ° to+10 °.
2. a kind of control method for improving collecting system collecting efficiency according to claim 1, it is characterised in that: described super
Early warning temperature T2 is to be on the verge of system maximum temperature value to subtract 10 DEG C, and early warning temperature T0 is to be on the verge of system maximum temperature value to subtract 30
℃。
3. a kind of control method for improving collecting system collecting efficiency according to claim 1, it is characterised in that: first
In partial control method, when the temperature of molten salt for detecting least significant end heat collector exit in collecting system reaches intermediate early warning temperature
When spending T1, increase the flow rate of molten salt that cold salt cellar enters heat collector, after the 5%-10% for increasing existing flow, persistently records least significant end
The temperature of molten salt in heat collector exit maintains existing flow if temperature of molten salt no longer increases, if temperature of molten salt persistently rises,
The 5%-10% of existing flow is then continued growing, until temperature of molten salt is in early warning temperature T0 to the temperature range of super early warning temperature T2
Inside no longer increase.
4. a kind of control method for improving collecting system collecting efficiency according to claim 1, it is characterised in that: first
In partial control method, when the temperature of molten salt for detecting least significant end heat collector exit in collecting system reaches super early warning temperature
When T2, increase the flow rate of molten salt that cold salt cellar enters heat collector, after the 10%-20% for increasing existing flow, persistently records least significant end
The temperature of molten salt in heat collector exit, if temperature of molten salt revert to the temperature range of early warning temperature T0 to super early warning temperature T2,
Existing flow is maintained, if temperature of molten salt persistently rises, continues growing the 10%-20% of existing flow, until temperature of molten salt is tieed up
Hold the temperature range in T0-T2.
5. a kind of control method for improving collecting system collecting efficiency according to claim 1, it is characterised in that: second
In partial control method, when adjusting the reflecting mirror of the heat collector, successively adjusted according to since the heat collector of end
The mode of section.
6. a kind of control method for improving collecting system collecting efficiency according to claim 1, it is characterised in that: second
In partial control method, the solar tracking deviation is -5 ° to+5 °.
7. a kind of control method for improving collecting system collecting efficiency according to claim 3, it is characterised in that: in described
Between early warning temperature T1 be to be on the verge of system maximum temperature value and subtract 20 DEG C.
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| CN201710771906.7A CN109442770A (en) | 2017-08-31 | 2017-08-31 | A kind of control method improving collecting system collecting efficiency |
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| CN201710771906.7A CN109442770A (en) | 2017-08-31 | 2017-08-31 | A kind of control method improving collecting system collecting efficiency |
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| CN103727687A (en) * | 2013-12-30 | 2014-04-16 | 北京工业大学 | Double-fused-salt solar thermal power plant heat transferring and heat storing system |
| CN105444437A (en) * | 2015-11-23 | 2016-03-30 | 中国东方电气集团有限公司 | Coordinated control device for light field fused salt flow adjustment and defocusing adjustment of groove type photo-thermal power station |
| CN105756873A (en) * | 2016-03-21 | 2016-07-13 | 中国科学院工程热物理研究所 | Solar steam direct power generation system with heat storage function |
| CN106766271A (en) * | 2016-12-15 | 2017-05-31 | 常州龙腾光热科技股份有限公司 | A kind of thermal-arrest field lens outlet temperature control method generated electricity for solar energy heating |
-
2017
- 2017-08-31 CN CN201710771906.7A patent/CN109442770A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1892147A (en) * | 2005-07-05 | 2007-01-10 | 新疆新能源股份有限公司 | Direct-flow type solar water-heating system and its water-flow control method |
| DE102011007370A1 (en) * | 2011-04-14 | 2012-10-18 | Siemens Aktiengesellschaft | Solar thermal power plant with storage for a heat transfer medium and method for operating the solar thermal power plant in the unloading mode of the storage |
| CN103727687A (en) * | 2013-12-30 | 2014-04-16 | 北京工业大学 | Double-fused-salt solar thermal power plant heat transferring and heat storing system |
| CN105444437A (en) * | 2015-11-23 | 2016-03-30 | 中国东方电气集团有限公司 | Coordinated control device for light field fused salt flow adjustment and defocusing adjustment of groove type photo-thermal power station |
| CN105756873A (en) * | 2016-03-21 | 2016-07-13 | 中国科学院工程热物理研究所 | Solar steam direct power generation system with heat storage function |
| CN106766271A (en) * | 2016-12-15 | 2017-05-31 | 常州龙腾光热科技股份有限公司 | A kind of thermal-arrest field lens outlet temperature control method generated electricity for solar energy heating |
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Application publication date: 20190308 |