CN103335422B - Stable heat-collection control method for light field of trough type light-focusing solar thermal power plant - Google Patents
Stable heat-collection control method for light field of trough type light-focusing solar thermal power plant Download PDFInfo
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Abstract
The invention discloses a stable heat-collection control method for a light field of a trough type light-focusing solar thermal power plant, and solves the problem of poor stable heat-collection control effect of an existing light field. The stable heat-collection control method for the light field of the trough type light-focusing solar thermal power plant is characterized by comprising the following steps: (1) a condenser main loop of the light field of the trough type light-focusing solar thermal power plant is evenly divided into at least two temperature detection areas, each temperature detection area corresponds to a condenser unit and a branch loop of the condenser unit, a reference temperature value of each temperature detection area is set, and the temperature detection area feeds back detected actual temperature of heat transfer oil to a condenser local controller; (2) the condenser local controllers compare the actual temperatures of the heat transfer oil, which are fed back by the temperature detection areas, with the reference temperature values of the temperature detection areas, and then at least one of the following operations is carried out: (A) the rotating speed of a heat transfer oil pump is adjusted; (B) the working attitude of the condenser is converted; and (C) the flows of the branch loops of the condensers are adjusted.
Description
Technical field
The invention belongs to trough type solar power generation technical field, specifically, relate to a kind of slot light collection solar thermal power generation station light field stable set heat control method.
Background technology
Solar heat power generation system utilizes solar concentrator, by assembling solar energy heating water, produces water vapour for promoting turbine power generation.In the area that solar energy resources is abundant, solar heat power generation system has the generating efficiency up to 24%, and it also can combinationally use with the combustion technology of routine, forms a kind of multi-energies hybrid power generating system.
In slot light collection solar thermal power generation station, the inlet temperature T1 of conduction oil and outlet temperature T2, output to steam turbine energy (namely light field collect energy Q
t) must keep stable.But the main feature that slot light collection solar thermal power generation stands in thermal-arrest aspect is exactly heat energy source instability.Heat energy source instability causes primarily of solar radiation variations, and as shown in Figure 1, the change of solar radiation is mainly divided into following double teacher again: one, directly radiation, from sunrise, to about 8 a.m., strengthens rapidly; Two, 8 a.m. is to about 11, and direct radiation amplification weakens gradually; Three, 11 to point in afternoon 15, and direct radiation remains on metastable peak value; Four, direct radiation in 15 o'clock to 19 o'clock afternoon slowly weakens; Five, after at 19 in afternoon, direct radiation weakens rapidly.Except morning and direct radiation at dusk rapidly changes phase, the other times section in a day, during direct radiation value change, to the energy Q of steam turbine
tall must keep a metastable value, when direct radiation variation, the heat energy collected by light field must keep relative stablizing.
In prior art, during direct solar radiation change, light field is by regulating the flow m of conduction oil in concentrator by Heat-transfer Oil Pump
tto guarantee to export the stable of gross energy to steam turbine and heat reservoir, and general of power station can be equipped with the conduction oil main pump that is positioned at conduction oil main line, be responsible for circulating heat conduction oil, therefore, when regulating conduction oil main pump, the conduction oil bypass flow at place, each concentrator loop has delayed significantly, and this hysteresis very easily causes conduction oil temperature overtemperature within a period of time.Conduction oil there will be signs of degradation when exceeding operating temperature, and the endothermic effect of conduction oil can be made to regulate, and greatly reduces power station performance, accelerates the replacement cycle of conduction oil.
Therefore, how to control light field and stablize thermal-arrest, avoid the work of conduction oil overtemperature just to become the emphasis research and development content of those skilled in the art.
Summary of the invention
The object of the invention is to overcome above-mentioned defect, provide a kind of control simple, cost is low, realize slot light collection solar thermal power generation station light field stable set heat control method easily.
To achieve these goals, the technical solution used in the present invention is as follows:
Slot light collection solar thermal power generation station light field stable set heat control method, comprises the following steps:
(1) the concentrator major loop of slot light collection solar thermal power generation station light field is evenly divided at least two temperature sensing area, the corresponding concentrator unit in each temperature sensing area and Zhi Huilu thereof, and the reference temperature value of set temperature surveyed area, the actual conduction oil temperature that detects is fed back to concentrator local controller in temperature sensing area;
(2) reference temperature value of the actual conduction oil temperature fed back temperature sensing area of concentrator local controller and this temperature sensing area compares, and carries out following at least one operation:
A, adjustment Heat-transfer Oil Pump rotating speed;
The operating attitude of B, conversion concentrator;
The flow of C, adjustment concentrator Zhi Huilu.
Specifically, in described step (1), the temperature of conduction oil is detected by being arranged on the temperature sensor realization in this temperature sensing area in temperature sensing area, and the actual conduction oil temperature detected by temperature sensor feedback is to concentrator local controller.
Further, in described step (1), the reference temperature value of each temperature sensing area comprises t1, t2, t3, t0; And t1 < t2 < t3, t0 < t3.
Wherein, regulate the concrete methods of realizing of Heat-transfer Oil Pump rotating speed as follows in described step (2): when the actual heat conduction oil temperature t > t1 detected is fed back in temperature sensing area, then to improve Heat-transfer Oil Pump rotating speed.
In described step (2), the concrete methods of realizing of the operating attitude of conversion concentrator is as follows: when the actual heat conduction oil temperature t > t2 detected is fed back in temperature sensing area, and the concentrator local controller concentrator unit controlled corresponding to this temperature sensing area is converted to by normal tracking and defocuses tracking.
Further, when the actual heat conduction oil temperature t > t3 detected is fed back in temperature sensing area, concentrator local controller controls concentrator cell translation corresponding to this temperature sensing area to original state.
Further, when after concentrator cell translation to original state, the actual heat conduction oil temperature t < t0 detected is fed back in the temperature sensing area corresponding with it, and concentrator local controller then controls this concentrator cell translation to normally following the tracks of or defocusing tracking.
Regulate the concrete methods of realizing of the flow of concentrator Zhi Huilu as follows in described step (2): the porch of each concentrator unit Zhi Huilu corresponding in described temperature sensing area arranges automatic flow control valve, is directly regulated the conduction oil flow of the concentrator unit Zhi Huilu corresponding with it by automatic flow control valve.
Described automatic flow control valve regulates the implementation method of the conduction oil flow of the concentrator unit Zhi Huilu corresponding with it to comprise automatic mode and manual mode.
The realization of described automatic mode is as follows: when the conduction oil temperature that concentrator unit props up circuit outlet is greater than conduction oil operation setup temperature, opens the valve of automatic flow control valve, increases the conduction oil flow of this concentrator unit Zhi Huilu; Otherwise, then the valve of automatic flow control valve is closed; Usually, the conduction oil temperature that concentrator unit props up circuit outlet is 87 DEG C to 398 DEG C, and conduction oil operation setup temperature is 310 DEG C to 393 DEG C, differs 1 DEG C therebetween and regulates at once.
The realization of described manual mode is as follows: when direct solar radiation is less than the working radiation value of concentrator setting, opens the valve of automatic flow control valve, increase the conduction oil flow of this concentrator unit Zhi Huilu; Or, when environment temperature is less than the operating ambient temperature of concentrator setting, opens the valve of automatic flow control valve, increase the conduction oil flow of this concentrator unit Zhi Huilu; Or, when automatic flow control valve power supply is less than setting power values, opens the valve of automatic flow control valve, increase the conduction oil flow of this concentrator unit Zhi Huilu.Usually, above-mentioned direct solar radiation is 0-1500W/M
2, the working radiation of concentrator setting is 350W/M2; Operating ambient temperature is 10 DEG C; Setting power values is 24V.
Design principle of the present invention: the control method of conduction oil temperature disperseed from existing single control conduction oil main pump, reaches steady heat conduction oil temperature rapidly in time by the conduction oil Zhi Huilu controlling separately each concentrator unit; Meanwhile, branch road porch is adopted to control the synergic adjustment mode of flow, Heat-transfer Oil Pump antedating response and concentrator conversion attitude, the problem solving the light field stable set thermal control of slot light collection solar thermal power generation station of low cost.
The present invention compared with prior art, has the following advantages and beneficial effect:
(1) major loop is divided into some (at least two) temperature sensing area by the present invention, the corresponding concentrator unit in each temperature sensing area, conduction oil temperature in temperature sensing area is monitored in time, realize controlling separately the Zhi Huilu of concentrator unit, regulating, reaction speed is fast, when efficiently avoid existing single control Heat-transfer Oil Pump rotating speed, concentrator Zhi Huilu is delayed, causes the problem of conduction oil temperature overtemperature within a period of time.
(2) the present invention adopts three kinds of regulative mode collaborative works, the i.e. operating attitude of Heat-transfer Oil Pump rotational speed regulation, conversion concentrator and flow three kinds of regulative modes of adjustment concentrator Zhi Huilu, it only needs to install a small amount of temperature sensor and automatic flow control valve, not only with low cost, and control simply, conveniently, the problem solving the light field stable set thermal control of slot light collection solar thermal power generation station of low cost.
Accompanying drawing explanation
Fig. 1 is the one day solar energy output exemplary plot in slot light collection solar thermal power generation station.
Fig. 2 is the fundamental diagram of automatic flow control valve in the present invention.
Detailed description of the invention
Below in conjunction with drawings and Examples, the invention will be further described, and embodiments of the present invention include but not limited to the following example.
Embodiment
The station installed capacity of slot light collection solar thermal power generation, generally all more than more than 50MW, about light field scale reaches 150 concentrator loops, has the thermal conductive oil pipeline huge more than 2 square kilometres.At present, in order to economy, slot light collection solar thermal power generation station is only equipped with the conduction oil main pump that is positioned at conduction oil main line, is responsible for circulating heat conduction oil.Therefore, when regulating conduction oil main pump, the conduction oil bypass flow at place, each concentrator loop has delayed significantly.
When direct radiation changes suddenly (as broken sky, sunlight frequently passes in and out cloud layer), the conduction oil temperature of concentrator branch road also can sharply change, if concentrator branch road port of export conduction oil temperature overtemperature now detected or by overtemperature, carry out corresponding control again, can because aforesaid hysteresis effect causes conduction oil temperature overtemperature within a period of time.Conduction oil there will be signs of degradation when exceeding operating temperature, and then the endothermic effect of conduction oil is changed, and greatly reduces power station performance, and accelerates the replacement cycle of conduction oil.
In order to solve the problem, present embodiments provide a kind of slot light collection solar thermal power generation station light field stable set heat control method, the control method of conduction oil temperature is disperseed by the method from existing single control conduction oil main pump, reaches steady heat conduction oil temperature rapidly in time by the conduction oil Zhi Huilu controlling separately each concentrator unit; Meanwhile, branch road porch is adopted to control the synergic adjustment mode of flow, Heat-transfer Oil Pump antedating response and concentrator conversion attitude.Specifically, this slot light collection solar thermal power generation station light field stable set heat control method comprises the following steps:
(1) the concentrator major loop of slot light collection solar thermal power generation station light field is evenly divided at least two temperature sensing area, the corresponding concentrator unit in each temperature sensing area and Zhi Huilu thereof, and the reference temperature value of set temperature surveyed area, the actual conduction oil temperature that detects is fed back to concentrator local controller in temperature sensing area;
(2) reference temperature value of the actual conduction oil temperature fed back temperature sensing area of concentrator local controller and this temperature sensing area compares, and carries out following at least one operation: regulate Heat-transfer Oil Pump rotating speed; The operating attitude of conversion concentrator; Regulate the flow of concentrator Zhi Huilu.
In one embodiment, slot light collection solar thermal power generation station 600 meters of concentrator major loop is divided into the concentrator unit that 4 sections 150 meters long arranged side by side between two: a, b, c, d, the corresponding temperature sensing area of each unit, mounting temperature sensor in it, the temperature of conduction oil is detected by being arranged on temperature sensor feedback in this temperature sensing area to concentrator local controller in temperature sensing area, this concentrator local controller primary responsibility controls concentrator and follows the tracks of solar motion, and it is prior art; Each concentrator unit corresponding concentrator unit Zhi Huilu: a ', b ', c ', d ', in the porch of a ', b ', c ', d ', automatic flow control valve is installed respectively; Meanwhile, each temperature sensing area arranges t1, t2, t3, t0 tetra-reference values, and above-mentioned four reference values are the power station debug phase, and light field is repeatedly tried out and drawn, and t1, t2, t3, t0 difference in each temperature sensing area.Conduction oil in a concentrator Zhi Huilu heats up gradually from the inlet to the outlet, and therefore, above-mentioned reference value meets relation: t1 < t2 < t3, t0 < t3.
The present invention controls square, and to stablize the implementation procedure of thermal-arrest as follows:
When the actual heat conduction oil temperature t > t1 detected is fed back in temperature sensing area, then improve Heat-transfer Oil Pump rotating speed, make this lead can offset the hysteresis effect of pipeline, this is the process regulating Heat-transfer Oil Pump rotating speed.
Further, if after a period of time, said temperature t continues to raise, when the actual heat conduction oil temperature t > t2 detected is fed back in temperature sensing area, the concentrator local controller concentrator unit (150 meters of concentrator unit) controlled corresponding to this temperature sensing area is converted to by normal tracking and defocuses tracking, normal tracking and the normal duty of concentrator, the speculum on concentrator is just to solar radiation; Technical term defocuses tracking, namely follows the tracks of the sun under the incomplete focus state of concentrator.This is the conversion of concentrator operating attitude.
Further, if said temperature t continues to raise, when the actual heat conduction oil temperature t > t3 detected is fed back in temperature sensing area, concentrator local controller controls concentrator cell translation corresponding to this temperature sensing area to original state.Original state is STOW state, and now the sun cannot shine directly into the speculum of concentrator.When after concentrator cell translation to original state, the actual heat conduction oil temperature t < t0 detected is fed back in the temperature sensing area corresponding with it, and concentrator local controller then controls this concentrator cell translation to normally following the tracks of or defocusing tracking.
Meanwhile, the automatic flow control valve of each concentrator unit Zhi Huilu is according to actual condition, and the flow of adjustment Zhi Huilu, its shaping modes is divided into: automatic mode and manual mode two kinds.The operation principle of automatic flow control valve as shown in Figure 2.
Wherein, the realization of automatic mode is as follows: when the conduction oil temperature that concentrator unit props up circuit outlet is greater than conduction oil operation setup temperature, opens the valve of automatic flow control valve, increases the conduction oil flow of this concentrator unit Zhi Huilu; Otherwise, then the valve of automatic flow control valve is closed.In automatic mode, the valve opening of automatic flow control valve is determined according to actual condition; Usually, the conduction oil temperature that concentrator unit props up circuit outlet is 87 DEG C to 398 DEG C, and conduction oil operation setup temperature is 310 DEG C to 393 DEG C, differs 1 DEG C therebetween and regulates at once.
The realization of manual mode is as follows: when direct solar radiation is less than the working radiation value of concentrator setting, opens the valve of automatic flow control valve, increase the conduction oil flow of this concentrator unit Zhi Huilu; Or, when environment temperature is less than the operating ambient temperature of concentrator setting, opens the valve of automatic flow control valve, increase the conduction oil flow of this concentrator unit Zhi Huilu; Or, when automatic flow control valve power supply is less than setting power values, opens the valve of automatic flow control valve, increase the conduction oil flow of this concentrator unit Zhi Huilu.In manual mode, the valve opening of automatic flow control valve is 100%; Above-mentioned three kinds of operating modes, meet any one, and automatic flow control valve at once manual mode regulates.Usually, above-mentioned direct solar radiation is 0-1500W/M
2, the working radiation of concentrator setting is 350W/M2; Operating ambient temperature is 10 DEG C; Setting power values is 24V.
When direct solar radiation frequently changes by a small margin, the flow that conduction oil main pump regulates conduction oil can not be controlled, and adopt other the two kinds of regulative modes in three kinds of regulative modes provided by the present invention, and reach the effect that light field stablizes thermal-arrest.Technical scheme provided by the present invention controls separately the concentrator unit marked off, not only governing response is quick, and only need to increase the temperature sensor and automatic flow control valve that have lacked, thus make the invention process cost very low, greatly promote the development of solar energy thermal-power-generating technology.
According to above-described embodiment, just the present invention can be realized well.What deserves to be explained is; under prerequisite based on said structure design, for solving same technical problem, even if some making on the invention are without substantial change or polishing; the essence of the technical scheme adopted is still the same with the present invention, therefore it also should in protection scope of the present invention.
Claims (4)
1. slot light collection solar thermal power generation station light field stable set heat control method, is characterized in that, comprise the following steps:
(1) the concentrator major loop of slot light collection solar thermal power generation station light field is evenly divided at least two temperature sensing area, the corresponding concentrator unit in each temperature sensing area and Zhi Huilu thereof, and the reference temperature value of set temperature surveyed area, the actual conduction oil temperature that detects is fed back to concentrator local controller in temperature sensing area;
(2) reference temperature value of the actual conduction oil temperature fed back temperature sensing area of concentrator local controller and this temperature sensing area compares, and carries out following at least one operation:
A, adjustment Heat-transfer Oil Pump rotating speed;
The operating attitude of B, conversion concentrator;
The flow of C, adjustment concentrator Zhi Huilu;
In described step (1), the reference temperature value of each temperature sensing area comprises t1, t2, t3, t0; And t1 < t2 < t3, t0 < t3;
Regulate the concrete methods of realizing of Heat-transfer Oil Pump rotating speed as follows in described step (2): when the actual heat conduction oil temperature t > t1 detected is fed back in temperature sensing area, then to improve Heat-transfer Oil Pump rotating speed;
In described step (2), the concrete methods of realizing of the operating attitude of conversion concentrator is as follows: when the actual heat conduction oil temperature t > t2 detected is fed back in temperature sensing area, and the concentrator local controller concentrator unit controlled corresponding to this temperature sensing area is converted to by normal tracking and defocuses tracking;
When the actual heat conduction oil temperature t > t3 detected is fed back in temperature sensing area, concentrator local controller controls concentrator cell translation corresponding to this temperature sensing area to original state;
When after concentrator cell translation to original state, the actual heat conduction oil temperature t < t0 detected is fed back in the temperature sensing area corresponding with it, and concentrator local controller then controls this concentrator cell translation to normally following the tracks of or defocusing tracking;
Regulate the concrete methods of realizing of the flow of concentrator Zhi Huilu as follows in described step (2): the porch of each concentrator unit Zhi Huilu corresponding in described temperature sensing area arranges automatic flow control valve, is directly regulated the conduction oil flow of the concentrator unit Zhi Huilu corresponding with it by automatic flow control valve.
2. slot light collection solar thermal power generation station according to claim 1 light field stable set heat control method, it is characterized in that, in described step (1), the temperature of conduction oil is detected by being arranged on the temperature sensor realization in this temperature sensing area in temperature sensing area, and the actual conduction oil temperature detected by temperature sensor feedback is to concentrator local controller.
3. slot light collection solar thermal power generation station according to claim 2 light field stable set heat control method, it is characterized in that, described automatic flow control valve regulates the implementation method of the conduction oil flow of the concentrator unit Zhi Huilu corresponding with it to comprise automatic mode and manual mode.
4. slot light collection solar thermal power generation station according to claim 3 light field stable set heat control method, it is characterized in that, the realization of described automatic mode is as follows: when the conduction oil temperature that concentrator unit props up circuit outlet is greater than conduction oil operation setup temperature, open the valve of automatic flow control valve, increase the conduction oil flow of this concentrator unit Zhi Huilu; Otherwise, then the valve of automatic flow control valve is closed;
The realization of described manual mode is as follows: when direct solar radiation is less than the working radiation value of concentrator setting, opens the valve of automatic flow control valve, increase the conduction oil flow of this concentrator unit Zhi Huilu; Or, when environment temperature is less than the operating ambient temperature of concentrator setting, opens the valve of automatic flow control valve, increase the conduction oil flow of this concentrator unit Zhi Huilu; Or, when automatic flow control valve power supply is less than setting power values, opens the valve of automatic flow control valve, increase the conduction oil flow of this concentrator unit Zhi Huilu.
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| CN105241092B (en) * | 2015-10-30 | 2018-03-13 | 东方电气集团东方锅炉股份有限公司 | The optically focused station control system and its implementation in a kind of photo-thermal power station |
| CN105371509B (en) * | 2015-11-23 | 2017-05-31 | 中国东方电气集团有限公司 | The hot tank control device of slot type solar-thermal generating system combination weather forecasting data |
| CN105444437B (en) * | 2015-11-23 | 2017-05-31 | 中国东方电气集团有限公司 | The light field flow rate of molten salt of slot type light thermo-power station with defocus regulation cooperative control device |
| CN108518879A (en) * | 2018-04-09 | 2018-09-11 | 山西炅奇新能源科技有限公司 | A kind of focusing solar tracking control system, method and hot water preparation system |
| CN109520159A (en) * | 2018-10-16 | 2019-03-26 | 北京拉夫堡太阳能技术有限公司 | A kind of temprature control method and system of solar energy heat collection pipe |
| CN110108049B (en) * | 2019-06-06 | 2023-11-21 | 中国能源建设集团陕西省电力设计院有限公司 | Device and method for measuring spot energy and heat flux density of solar concentrator |
| CN111207525B (en) * | 2020-02-10 | 2021-05-28 | 南京南瑞继保电气有限公司 | Intermittent driving method and device for heat collecting groove of groove type photo-thermal solar system |
| CN114111060B (en) * | 2021-11-25 | 2022-11-22 | 斯玛特储能技术有限公司 | Oil injection adjusting system and oil temperature adjusting method for trough type heat collecting field |
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| US6442937B1 (en) * | 2001-08-21 | 2002-09-03 | The Boeing Company | Solar receiver adaptive tracking control |
| CN102242699A (en) * | 2010-05-12 | 2011-11-16 | 中国科学院工程热物理研究所 | Double-stage heat storage trough type solar thermal power generation system |
| CN102692088B (en) * | 2011-03-24 | 2013-11-27 | 益科博能源科技（上海）有限公司 | Flow control method for solar heat collector system |
| CN102425865B (en) * | 2011-11-07 | 2013-06-05 | 深圳市联讯创新工场科技开发有限公司 | Solar heat collecting device |
| CN103075822B (en) * | 2012-12-26 | 2015-01-28 | 首航节能光热技术股份有限公司 | System and method for controlling trough type concentrators in trough type concentrating solar power station |
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