CN103439084B - Groove type solar condensing thermal power generation station condenser collecting efficiency method for testing and analyzing - Google Patents

Abstract

The invention discloses a kind of groove type solar condensing thermal power generation station condenser collecting efficiency method for testing and analyzing, this method for testing and analyzing is according to test data, by least square fitting curve, draw the collecting efficiency of condenser and the relational expression of condenser import and export oil temperature, such that it is able to draw condenser collecting efficiency and curve chart in whole service temperature range. Method for testing and analyzing provided by the present invention is simple, science, has filled up both at home and abroad in the blank of the art, and for collector designs and improvement, improving collecting efficiency has important facilitation. Therefore, it is suitable for popularization and application.

Description

Groove type solar condensing thermal power generation station condenser collecting efficiency method for testing and analyzing

Technical field

The invention belongs to trough type solar power generation technical field, specifically, relate to a kind of groove type solar condensing thermal power generation station condenser collecting efficiency method for testing and analyzing.

Background technology

Groove type solar condensing thermal power generation technology, mainly by groove type paraboloid mirror (condenser) by solar light focusing on one wire, tubulose heat absorption device (thermal-collecting tube) by installing on this focal line absorbs the solar radiant energy after focusing on. The fluid working substance (conduction oil) for absorbing solar radiant energy it is filled with in thermal-arrest organ pipe, then pass through pipeline and heated conduction oil is delivered to steam generator (solar boiler), produce superheated steam and send into steam turbine generator system generating, thus completing the conversion of solar energy to electrical. 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 use with conventional combustion technology combination, constitutes a kind of multi-energies hybrid power generating system.

Condenser is one of the key equipment at groove type solar condensing thermal power generation station, at present, there is no reliable simple and direct method of testing both at home and abroad to detect the collecting efficiency of condenser. In prior art, conventional detection is that whole light field condenser is detected, and needed for the detection system of application, heat conduction oil mass is very big, and system equipment is very huge, requires also to be greatly improved to the technology of equipment.

Therefore, design is a kind of effective, and test science, accurately method of testing, so that condenser detection system compact, detects convenient, quick, just becomes the important topic of those skilled in the art.

Summary of the invention

It is an object of the invention to overcome drawbacks described above, it is provided that a kind of effective, and test science, accurately groove type solar condensing thermal power generation station condenser collecting efficiency method for testing and analyzing.

To achieve these goals, the technical solution used in the present invention is as follows:

Groove type solar condensing thermal power generation station condenser collecting efficiency method for testing and analyzing, whole condenser light field is divided into some unit and using one of them unit as test cell, usually, choosing 150 meters of light fields as test cell, this method for testing and analyzing is based on groove type solar condensing thermal power generation station optical field characteristics and proposes;

E is condenser actual acquisition heat, unit K J, and its mathematic(al) representation is:

E=m_t[h(T_out)-h(T_in)](1)

m_tThe accumulated quality flow of conduction oil, units/kg in the t time; T_outCondenser outlet guide hot oil temperature, unit DEG C; T_inCondenser import conduction oil temperature, unit DEG C; H (T_in) at T_inTime conduction oil enthalpy, unit kJ/kg; H (T_out) at T_outTime conduction oil enthalpy, unit kJ/kg;

E₀Obtaining heat, unit K J for condenser theory, its mathematic(al) representation is:

E₀=0.001 (DNI) S t ��_mirror����_HCE(2)

DNI direct solar radiation intensity, unit w/m²; S condenser aperture area, unit m²; The t test run time, unit s; ��_mirrorReflectance of reflector, unit %; ��_HCEThermal-collecting tube is at mean flow temperature T_fTime design thermal efficiency, wherein:

T_f=(T_out+T_in)/2(3)

According to ��=E/E₀, formula (1) and (2) obtain the mathematic(al) representation of ��:

$\mathrm{\η}=\frac{m_t\[h\left(T_{out}\right)-h\left(T_{in}\right)\]}{0.001\·\left(DNI\right)\·S\·t\·{\mathrm{\ϵ}}_{mirror}\·{\mathrm{\η}}_{HCE}}---\left(4\right)$

�� condenser collecting efficiency;

S1, choose a test cell import conduction oil temperature T_in, this T_inIt should be relatively low temperature, interval delta T_inTest, obtains the import conduction oil temperature that this test cell n+1 group is different: T_in0��T_in1��T_in2��T_in3��T_inn, and the outlet guide hot oil temperature that this test cell n+1 group is different: T_out0��T_out1��T_out2�� T_out3��T_outn;

S2, test record above-mentioned T_in0��T_in1��T_in2��T_in3��T_inn; T_out0��T_out1��T_out2��T_out3��T_outn; Corresponding DNI value X₀��X₁��X₂��X₃��X_n; Corresponding test run time t₀��t₁��t₂��t₃��t_n; Corresponding conduction oil accumulated quality flow m_t0��m_t1��m_t2��m_t3��m_tn;

S3, data test recorded substitute into formula (3), draw the average conduction oil temperature T of correspondence_fi: T_f0,T_f1,T_f2,T_f3��T_fn; The data of test record are substituted into formula (4), calculates condenser collecting efficiency ��_i: ��₀,��₁,��₂,��₃����_n, thus drawing average conduction oil temperature T_fi: T_f0,T_f1,T_f2,T_f3��T_fnThe collecting efficiency �� of lower test cell_i: ��₀,��₁,��₂,��₃����_n;

S4, with T_fiFor transverse axis, ��_iCoordinate axes is set up, by above-mentioned T for vertical pivot_f0,T_f1,T_f2,T_f3��T_fnAnd ��₀,��₁,��₂,��₃����_nWith point (T_f0,��₀)��(T_f1,��₁)��(T_f2,��₂)��(T_f3,��₃)��(T_fn,��_n) represent on this coordinate axes;

S5, basis (T_f0,��₀)��(T_f1,��₁)��(T_f2,��₂)��(T_f3,��₃)��(T_fn,��_n), adopt least square fitting curve, draw �� and T_fMathematic(al) representation:

$\mathrm{\η}={\mathrm{aT}}_f^2+{\mathrm{bT}}_f+c---\left(5\right)$

A, b, c are constant;

S6, ask and makeIn M (a, b, c) value of a, b, c during place's acquirement minima;

S7, obtain according to formula (3):

��=0.25a (T_out+T_in)²+0.5b(T_out+T_in)+c��(6)

According to formula (6), it is possible to calculate and obtain when certain DNI, the higher interval condenser collecting efficiency �� of condenser entrance conduction oil temperature, thus obtaining the condenser collecting efficiency �� curve of whole service temperature range.

In one embodiment, a, b, c value is solved by the method for minimizing.

Specifically, the method for minimizing is seek the solution of below equation group:

$\left\{\begin{array}{c}{M}_a(a,b,c)=0\\ M_b(a,b,c)=0\\ M_c(a,b,c)=0\end{array}\right\}---\left(7\right)$

I.e. solving equation group:

$\left\{\begin{array}{c}a\underset{i=0}{\overset{n}{\mathrm{\Σ}}}{T}_{fi}^4+b\underset{i=0}{\overset{n}{\mathrm{\Σ}}}{T}_{fi}^3+c\underset{i=0}{\overset{n}{\mathrm{\Σ}}}{T}_{fi}^2=\underset{i=0}{\overset{n}{\mathrm{\Σ}}}{T}_{fi}^2{\mathrm{\η}}_i\\ a\underset{i=0}{\overset{n}{\mathrm{\Σ}}}{T}_{fi}^3+b\underset{i=0}{\overset{n}{\mathrm{\Σ}}}{T}_{fi}^2+c\underset{i=0}{\overset{n}{\mathrm{\Σ}}}{T}_{fi}=\underset{i=0}{\overset{n}{\mathrm{\Σ}}}{T}_{fi}{\mathrm{\η}}_i\\ a\underset{i=0}{\overset{n}{\mathrm{\Σ}}}{T}_{fi}^2+b\underset{i=0}{\overset{n}{\mathrm{\Σ}}}{T}_{fi}+nc=\underset{i=0}{\overset{n}{\mathrm{\Σ}}}{\mathrm{\η}}_i\end{array}\right\}---\left(8\right)$

After solving equation group (8), solve a, b, c value.

The design principle of the present invention: by testing condenser within the t time, the parameters such as import and export conduction oil temperature gap, flow calculate conduction oil and obtain heat in condenser thermal-collecting tube, simultaneously, the contrast desirable thermal-arrest value that under solar radiation value, collector designs efficiency calculation goes out within the t time, draws the collecting efficiency of condenser.

The present invention compared with prior art, has the following advantages and beneficial effect:

(1) whole light field is divided into some unit by the present invention, and using one of them unit as test cell, the condenser collecting efficiency �� curve of whole service temperature range is drawn further according to analysis method, test science, accurately, quick, and application the method carries out light field collecting efficiency test, equipment needed thereby miniaturization, required heat conduction oil mass also greatly reduces.

(2) present invention is according to test data, adopt least square fitting curve, draw the collecting efficiency of condenser and the relational expression of condenser import and export oil temperature, such that it is able to draw condenser collecting efficiency and curve chart in whole service temperature range, method is simple, science, having filled up both at home and abroad in the blank of the art, for collector designs and improvement, improving collecting efficiency has important facilitation.

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

Present embodiments provide a kind of groove type solar condensing thermal power generation station condenser collecting efficiency method for testing and analyzing, this analysis method is based on groove type solar condensing thermal power generation station optical field characteristics and proposes, whole condenser light field is divided into some unit and using one of them unit as test cell by it, usually, choose 150 meters of light fields as test cell, its design principle is: by testing condenser within the t time, import and export conduction oil temperature gap, the parameters such as flow calculate conduction oil and obtain heat in condenser thermal-collecting tube, simultaneously, the contrast desirable thermal-arrest value that under solar radiation value, collector designs efficiency calculation goes out within the t time, draw the collecting efficiency of condenser.

Condenser collecting efficiency ��=E/E₀, wherein:

E is condenser actual acquisition heat, unit K J, and its mathematic(al) representation is:

E=m_t[h(T_out)-h(T_in)](1)

m_tThe accumulated quality flow of conduction oil, units/kg in the t time; T_outCondenser outlet guide hot oil temperature, unit DEG C; T_inCondenser import conduction oil temperature, unit DEG C; H (T_in) at T_inTime conduction oil enthalpy, unit kJ/kg; H (T_out) at T_outTime conduction oil enthalpy, unit kJ/kg;

E₀Obtaining heat, unit K J for condenser theory, its mathematic(al) representation is:

E₀=0.001 (DNI) S t ��_mirror����_HCE(2)

DNI direct solar radiation intensity, unit w/m²; S condenser aperture area, unit m²; The t test run time, unit s; ��_mirrorReflectance of reflector, unit %; ��_HCEThermal-collecting tube is at mean flow temperature T_fTime design thermal efficiency, wherein:

T_f=(T_out+T_in)/2(3)

According to ��=E/E₀, formula (1) and (2) obtain the mathematic(al) representation of ��:

$\mathrm{\η}=\frac{m_t\[h\left(T_{out}\right)-h\left(T_{in}\right)\]}{0.001\·\left(DNI\right)\·S\·t\·{\mathrm{\ϵ}}_{mirror}\·{\mathrm{\η}}_{HCE}}---\left(4\right)$

S1, choose a test cell import conduction oil temperature T_in, this T_inIt should be relatively low temperature, interval delta T_inTest, obtains the import conduction oil temperature that this test cell n group is different: T_in0��T_in1��T_in2��T_in3��T_inn, and the outlet guide hot oil temperature that this test cell n group is different: T_out0��T_out1��T_out2��T_out3��T_outn;

S2, test record above-mentioned T_in0��T_in1��T_in2��T_in3��T_inn; T_out0��T_out1��T_out2��T_out3��T_outn; Corresponding DNI value X₀��X₁��X₂��X₃��X_n; Corresponding test run time t₀��t₁��t₂��t₃��t_n; Corresponding conduction oil accumulated quality flow m_t0��m_t1��m_t2��m_t3��m_tn;

S3, data test recorded substitute into formula (3), draw the average conduction oil temperature T of correspondence_fi: T_f0,T_f1,T_f2,T_f3��T_fn; The data of test record are substituted into formula (4), calculates condenser collecting efficiency ��_i: ��₀,��₁,��₂,��₃����_n, thus drawing average conduction oil temperature T_fi: T_f0,T_f1,T_f2,T_f3��T_fnThe collecting efficiency �� of lower test cell_i: ��₀,��₁,��₂,��₃����_n;

S4, with T_fiFor transverse axis, ��_iCoordinate axes is set up, by above-mentioned T for vertical pivot_f0,T_f1,T_f2,T_f3��T_fnAnd ��₀,��₁,��₂,��₃����_nWith point (T_f0,��₀)��(T_f1,��₁)��(T_f2,��₂)��(T_f3,��₃)��(T_fn,��_n) represent on this coordinate axes;

S5, basis (T_f0,��₀)��(T_f1,��₁)��(T_f2,��₂)��(T_f3,��₃)��(T_fn,��_n), adopt least square fitting curve, draw �� and T_fMathematic(al) representation:

$\mathrm{\η}={\mathrm{aT}}_f^2+{\mathrm{bT}}_f+c---\left(5\right)$

A, b, c are constant;

S6, ask and makeIn M (a, b, c) value of a, b, c during place's acquirement minima;

S7, obtain according to formula (3):

��=0.25a (T_out+T_in)²+0.5b(T_out+T_in)+c��(6)

According to formula (6), it is possible to calculate and obtain when certain DNI, the higher interval condenser collecting efficiency �� of condenser entrance conduction oil temperature, thus obtaining the condenser collecting efficiency �� curve of whole service temperature range.

In one embodiment, a, b, c value is solved by the method for minimizing.

Specifically, the method for minimizing is seek the solution of below equation group:

$\left\{\begin{array}{c}{M}_a(a,b,c)=0\\ M_b(a,b,c)=0\\ M_c(a,b,c)=0\end{array}\right\}---\left(7\right)$

I.e. solving equation group:

$\left\{\begin{array}{c}a\underset{i=0}{\overset{n}{\mathrm{\Σ}}}{T}_{fi}^4+b\underset{i=0}{\overset{n}{\mathrm{\Σ}}}{T}_{fi}^3+c\underset{i=0}{\overset{n}{\mathrm{\Σ}}}{T}_{fi}^2=\underset{i=0}{\overset{n}{\mathrm{\Σ}}}{T}_{fi}^2{\mathrm{\η}}_i\\ a\underset{i=0}{\overset{n}{\mathrm{\Σ}}}{T}_{fi}^3+b\underset{i=0}{\overset{n}{\mathrm{\Σ}}}{T}_{fi}^2+c\underset{i=0}{\overset{n}{\mathrm{\Σ}}}{T}_{fi}=\underset{i=0}{\overset{n}{\mathrm{\Σ}}}{T}_{fi}{\mathrm{\η}}_i\\ a\underset{i=0}{\overset{n}{\mathrm{\Σ}}}{T}_{fi}^2+b\underset{i=0}{\overset{n}{\mathrm{\Σ}}}{T}_{fi}+nc=\underset{i=0}{\overset{n}{\mathrm{\Σ}}}{\mathrm{\η}}_i\end{array}\right\}---\left(8\right)$

After solving equation group (8), solve a, b, c value.

According to above-described embodiment, the present invention just can be realized well. What deserves to be explained is; under premise based on said structure design, for solving same technical problem, even if some making in the present invention are without substantial change or polishing; the essence of the technical scheme adopted is still the same with the present invention, therefore it should also be as in protection scope of the present invention.

Claims (3)

1. groove type solar condensing thermal power generation station condenser collecting efficiency method for testing and analyzing, it is characterised in that whole condenser light field is divided into some unit and using one of them unit as test cell;

Condenser collecting efficiency ��=E/E₀, wherein:

E is condenser actual acquisition heat, and its mathematic(al) representation is:

E=m_t[h(T_out)-h(T_in)](1)

m_tThe accumulated quality flow of conduction oil in the t time; T_outCondenser outlet guide hot oil temperature; T_inCondenser import conduction oil temperature; H (T_in) at T_inTime conduction oil enthalpy; H (T_out) at T_outTime conduction oil enthalpy;

E₀Obtaining heat for condenser theory, its mathematic(al) representation is:

E₀=0.001 (DNI) S t ��_mirror����_HCE(2)

DNI direct solar radiation intensity; S condenser aperture area; The t test run time; ��_mirrorReflectance of reflector; ��_HCEThermal-collecting tube is at mean flow temperature T_fTime design thermal efficiency, wherein:

T_f=(T_out+T_in)/2(3)

According to ��=E/E₀, formula (1) and (2) obtain the mathematic(al) representation of ��:

$\mathrm{\η}=\frac{m_t\[h\left(T_{out}\right)-h\left(T_{in}\right)\]}{0.001\·\left(DNI\right)\·S\·t\·{\mathrm{\ϵ}}_{mirror}\·{\mathrm{\η}}_{HCE}}---\left(4\right)$

S1, choose a test cell import conduction oil temperature T_in, interval delta T_inTest, obtains the import conduction oil temperature that this test cell n+1 group is different: T_in0��T_in1��T_in2��T_in3��T_inn, and the outlet guide hot oil temperature that this test cell n+1 group is different: T_out0��T_out1��T_out2��T_out3��T_outn;

S2, test record above-mentioned T_in0��T_in1��T_in2��T_in3��T_inn; T_out0��T_out1��T_out2��T_out3��T_outn; Corresponding DNI value X₀��X₁��X₂��X₃��X_n; Corresponding test run time t₀��t₁��t₂��t₃��t_n; Corresponding conduction oil accumulated quality flow m_t0��m_t1��m_t2��m_t3��m_tn;

S3, data test recorded substitute into formula (3), draw the average conduction oil temperature T of correspondence_fi: T_f0,T_f1,T_f2,T_f3��T_fn; The data of test record are substituted into formula (4), calculates condenser collecting efficiency ��_i: ��₀,��₁,��₂,��₃����_n, thus drawing at average conduction oil temperature T_fi: T_f0,T_f1,T_f2,T_f3��T_fnThe collecting efficiency �� that lower test cell is corresponding_i: ��₀,��₁,��₂,��₃����_n;

S4, with T_fiFor transverse axis, ��_iCoordinate axes is set up, by above-mentioned T for vertical pivot_f0,T_f1,T_f2,T_f3��T_fnAnd ��₀,��₁,��₂,��₃����_nWith point (T_f0,��₀)��(T_f1,��₁)��(T_f2,��₂)��(T_f3,��₃)��(T_fn,��_n) represent on this coordinate axes;

S5, basis (T_f0,��₀)��(T_f1,��₁)��(T_f2,��₂)��(T_f3,��₃)��(T_fn,��_n), adopt least square fitting curve, draw �� and T_fMathematic(al) representation:

$\mathrm{\η}={\mathrm{aT}}_f^2+{\mathrm{bT}}_f+c---\left(5\right)$

A, b, c are constant;

S6, ask and makeM (a, b, c) place obtain minima time, a, b, the value of c;

S7, obtain according to formula (3):

��=0.25a (T_out+T_in)²+0.5b(T_out+T_in)+c(6)

Condenser collecting efficiency curve can be obtained according to formula (6).

2. groove type solar condensing thermal power generation station according to claim 1 condenser collecting efficiency method for testing and analyzing, it is characterised in that a, b, c value is solved by the method for minimizing.

3. groove type solar condensing thermal power generation station according to claim 2 condenser collecting efficiency method for testing and analyzing, it is characterised in that the method for minimizing is seek the solution of below equation group:

$\left\{\begin{array}{c}{M}_a(a,b,c)=0\\ M_b(a,b,c)=0\\ M_c(a,b,c)=0\end{array}\right\}---\left(7\right)$

I.e. solving equation group:

After solving equation group (8), solve a, b, c value.