CN107909309A - The assay method of low-pressure coal saver energy-saving effect - Google Patents

The assay method of low-pressure coal saver energy-saving effect Download PDF

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CN107909309A
CN107909309A CN201711453443.6A CN201711453443A CN107909309A CN 107909309 A CN107909309 A CN 107909309A CN 201711453443 A CN201711453443 A CN 201711453443A CN 107909309 A CN107909309 A CN 107909309A
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enthalpy
low
steam
pressure
coal saver
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宋昂
刘传玲
柳明辉
康艳昌
路刚
朱同兵
张雷
王学栋
王学同
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Huadian Electric Power Research Institute Co Ltd
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Huadian Electric Power Research Institute Co Ltd
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    • Y02P90/82—Energy audits or management systems therefor

Abstract

The present invention relates to a kind of assay method of low-pressure coal saver energy-saving effect.Domestic at present to use " equivalent enthalpy drop " theoretical calculation mostly and evaluation puts into operation the energy-saving effect of low-pressure coal saver, still " equivalent enthalpy drop " is theoretical, it is impossible to the problem of more accurate evaluation station boiler low-pressure coal saver energy-saving effect.The present invention is using scene or replaces the related meter in scene, pass through thermal performance test, respectively test unit put into operation under different load operating mode and stoppage in transit low-pressure coal saver two states under performance parameter, and carry out calculating amendment, obtain putting into operation under low-pressure coal saver and stoppage in transit low-pressure coal saver two states, the change curve of unit main steam flow, electrical power and heat consumption rate, so as to evaluate the energy-saving effect of low-pressure coal saver under different electric load operating modes.Evaluation analysis method provided by the invention, can accurately, intuitively evaluation analysis unit puts into operation the energy-saving effect of low-pressure coal saver.

Description

The assay method of low-pressure coal saver energy-saving effect
Technical field
The present invention relates to a kind of assay method of low-pressure coal saver energy-saving effect, saved for the station boiler low pressure that puts into operation The assay of energy-saving effect after coal device.
Background technology
The problem of station boiler generally existing exhaust gas temperature is higher at present, some boiler annual exhaust gas temperatures reach 165 DEG C, even more than 175 DEG C during summer high load capacity, beyond 30-40 DEG C of design load, boiler thermal efficiency reduces about 2.5 percentage points.Row Smoke temperature degree becomes the important indicator for influencing coal consumption, and weighs the important symbol of boiler operation level.Add low pressure and save coal Device, can be greatly lowered exhaust gas temperature, and this method does not produce boiler combustion any adverse effect.By investigation, at present state Interior existing a large amount of units use this technology, and low-pressure coal saver can significantly reduce exhaust gas temperature and coal consumption for power generation.But each power plant User determines the energy-saving effect of Installing Low Pressure Economizer according to data unit operation, and energy-saving index difference is very big, energy-saving effect And opinions vary.
Since low-pressure coal saver is mounted in boiler back end ductwork, calculating beyond the boundary condition of boiler efficiency, Er Qieqi Energy-saving effect is influenced by low-pressure coal saver operating parameter and operating condition again, therefore the energy-saving effect of Installing Low Pressure Economizer is not It can be calculated with the raising of boiler efficiency.Low-pressure coal saver can reduce exhaust gas temperature and unit coa consumption rate, and influence steam turbine Low pressure therrmodynamic system, the last several sections of steam extractions of exclusion steam turbine, increases condenser duty, improves steam turbine operation back pressure, pass through vapour Turbine thermal performance test determines influence of the low-pressure coal saver to Unit Economic index, and the influence of steam turbine performance because It is plain very much, it is difficult to each influence factor be distinguished, to determine the energy-saving effect of low-pressure coal saver.
Current domestic use " equivalent enthalpy drop " theoretical calculation mostly and the energy-saving effect for evaluating the low-pressure coal saver that puts into operation, due to " equivalent enthalpy drop " is that pure theory calculates, it is impossible to intuitively reflects that unit puts into operation the energy-saving effect of low-pressure coal saver, such as Application No. 201410329223.2 Chinese patent, therefore pass through the performance of Steam Turbine after on-the-spot test Installing Low Pressure Economizer, analysis The energy-saving effect and influence factor of low-pressure coal saver, determine that the maximum energy-saving effect and low-pressure coal saver of low-pressure coal saver are energy saving The evaluation method of effect, and guides Power Plant to be run in the state of most economical.Surveyed by the performance of unit low-pressure coal saver Examination and the analysis and research of energy-saving effect, grasp the analysis calculation method of boiler back end ductwork Installing Low Pressure Economizer energy-saving effect.
The content of the invention
It is an object of the invention to overcome above-mentioned deficiency existing in the prior art, and provide a kind of rational low pressure of design The assay method of economizer energy-saving effect, by thermal performance test, tests unit under different load respectively, put into operation, Performance parameter under stoppage in transit low-pressure coal saver two states, and carry out calculating amendment, obtain unit put into operation, stoppage in transit low-pressure coal saver Under performance indicator, so as to evaluate the energy-saving effect of low-pressure coal saver under different electric load operating modes.
Technical solution is used by the present invention solves the above problems：A kind of assay of low-pressure coal saver energy-saving effect Method, it is characterised in that step is as follows：
The first step, arranges several pressure, temperature, flow and electric work in Steam Turbine therrmodynamic system and low-pressure economizer system The measuring point of rate；
Second step, isolates the Steam Turbine therrmodynamic system in the first step and low-pressure economizer system, it is met heating power The insulation request of performance test；
3rd step, closes the valve that condensate system is connected with low-pressure economizer system, stoppage in transit low-pressure coal saver；In this case Carry out the thermal performance test of different load operating mode；
4th step, opens the valve of connection condensate system and low-pressure economizer system, put into operation low-pressure coal saver；In this case Carry out the thermal performance test under different load operating mode；
5th step, calculates the heat consumption rate of unit under different operating modes in two kinds of operating statuses of the 3rd step and the 4th step respectively, and carries out Parameters revision；The relation curve of heat consumption rate after drawing unit main steam flow respectively according to calculating correction result and correct, according to Two relation curves, are evaluated under same main steam flow, the energy-saving effect for the low-pressure coal saver that puts into operation.
More specifically, in the 3rd step and the 4th step, generator load, main vapour pressure and pitch aperture etc. are homogeneous Together.
More specifically, in the thermal performance test of the 3rd step and the 4th step, including measurement main steam enthalpy, reheating are steamed Vapour enthalpy, finally feed water enthalpy, cold reheated steam enthalpy, desuperheating water of superheater enthalpy, reheater desuperheating water enthalpy, #1 high plus steam admission enthalpy, #1 high Hydrophobic enthalpy, #2 high plus steam admission enthalpy, #2 HP heater drainages enthalpy, #3 high plus steam admission enthalpy, #3 HP heater drainages enthalpy, #1 high is added to add water enthalpy, #1 Height plus water outlet enthalpy, #2 high add water enthalpy, #2 high plus water outlet enthalpy, #3 high adds water enthalpy, #3 high adds water outlet enthalpy and generator output work Rate.
More specifically, in the thermal performance test of the 3rd step and the 4th step, including measurement feedwater flow, boiler vapour Equivalent flow, desuperheating water of superheater flow and the reheater attemperation water flow of bag SEA LEVEL VARIATION.
More specifically, the 5th step includes step is calculated as below：
（1）#3 high adds steam flow amount, #2 high adds steam flow amount and #1 high adds steam flow amount for calculating, and #3 high adds steam flow amount by formula Ge1=Gfw×（i32- i31）/（in3- is3）It is calculated, #2 high adds steam flow amount by formula Ge2=[Gfw×（i22- i21）- Ge1 （is3- is2）]/（in2- is2）It is calculated, #1 high adds steam flow amount by formula Ge3=[Gfw×（i12- i11）- （Ge1+Ge2）× （is2- is1）]/（in1- is1）It is calculated；
（2）Utilize formula Gms=Gfw+Gbl+GssCalculate main steam flow；
（3）The sum of high pressure cylinder door rod and front and rear gland steam leakage rate are calculated according to the thermodynamic property of manufactory；According to public affairs Formula Gch=Gms-Ggl-Ge1-Ge2-Ge3Calculate cold reheated steam flow；
（4）According to formula Grh=Gch+GrsCalculate reheated steam flow；
（5）According to formula ((Gms-Gss)×(ims-ifw)+Gch×(irh-ich)+Gss×(ims-iss)+Grs×(irh-irs))/Pe Calculate unit heat consumption rate；
（6）The fair curve provided according to manufactory, by main steam pressure, main steam temperature, reheat steam temperature, reheating Pressure drop and condenser exhaust steam pressure are modified to obtain the revised heat consumption rate of unit；
（7）The relation curve of main steam flow and revised heat consumption rate under the 3rd step and the 4th step two states is drawn, by closing It is that curve can be checked in and put into operation under different main steam flows and the difference of the heat consumption rate of stoppage in transit low-pressure coal saver；
（8）According to（7）In relation curve, check under the main steam flow for the low-pressure coal saver that puts into operation, corresponding stoppage in transit low pressure Heat consumption rate value during economizer, will put into operation and stop transport under low-pressure coal saver amendment to same main steam flow, obtain each experiment Heat consumption rate difference under operating mode, is calculated gross coal consumption rate difference, while considers the power generation coal that the power consumption of desulfurization booster pump influences Consumption rate, draws the gross coal consumption rate that unit is actually saved under different main steam flows；
In above-mentioned formula：imsTo measure main steam enthalpy；irhFor reheated steam enthalpy；ifwFor final feedwater enthalpy；ichSteamed for cold reheating Vapour enthalpy；issFor desuperheating water of superheater enthalpy；irsFor reheater desuperheating water enthalpy；in1For #1 high plus steam admission enthalpy；is1For #1 HP heater drainages Enthalpy；in2For #2 high plus steam admission enthalpy；is2For #2 HP heater drainage enthalpys；in3For #3 high plus steam admission enthalpy；is3For #3 HP heater drainage enthalpys；i11 Water enthalpy is added for #1 high；i12For #1 high plus water outlet enthalpy；i21Water enthalpy is added for #2 high；i22For #2 high plus water outlet enthalpy；i31Add for #3 high Water inlet enthalpy；i32For #3 high plus water outlet enthalpy；Pe is generated output power；GfwTo measure feedwater flow；GblFor boiler drum level The equivalent flow of change；GssFor desuperheating water of superheater flow；GrsFor reheater attemperation water flow；Ge1Steam flow amount is added for #3 high； Ge2Steam flow amount is added for #2 high；Ge3Steam flow amount is added for #1 high；GmsFor main steam flow；GglFor high pressure cylinder door rod and front and rear axle envelope The sum of steam leakage；GchFor cold reheated steam flow；GrhFor reheated steam flow；Ht is unit heat consumption rate.
By putting into operation to unit, stoppage in transit low-pressure coal saver virtual condition test, calculating analysis is carried out to result of the test, The result drawn more can intuitively analyze the energy-saving effect of low-pressure coal saver relative to " equivalent enthalpy drop " theoretical calculation.
More specifically, the measurement meter that identical measuring point uses under different operating modes is identical.Thermal performance test use or more Change site pressure, temperature, flow transmitter to carry out, no matter use or replace in-site measurement meter, keep calculating parameter to be used Measure the influence that meter is consistent under all operating modes, i.e., elimination measurement error is brought.
More specifically, unit puts into operation, stoppage in transit low-pressure coal saver working condition measuring system is consistent.
More specifically, unit put into operation, stoppage in transit low-pressure coal saver operating mode, except the low-pressure coal saver that puts into operation brings system, parameter Change it is outside the pale of civilization, other systems, the operating status of equipment should be consistent.Put into operation under different electric load operating modes, stoppage in transit low pressure saves coal The result of the test of device is as follows：
Title Unit 220MW- puts into operation 220MW- stops transport 200MW- puts into operation 200MW- stops transport 180MW- puts into operation 180MW- stops transport 160MW- puts into operation 160MW- stops transport
Generator active power MW 219.517 219.756 199.791 199.729 179.836 179.835 159.838 159.880
Main steam pressure MPa 13.054 13.003 13.126 13.047 13.115 13.036 11.648 11.646
Main steam temperature ℃ 533.71 536.31 535.09 533.65 531.72 536.38 535.55 535.87
Main steam enthalpy kJ/kg 3426.2 3433.6 3429.0 3426.1 3420.3 3433.4 3446.4 3447.2
Main steam flow t/h 665.599 672.367 599.439 606.021 536.780 541.356 476.586 485.463
Reheated steam pressure MPa 2.249 2.284 2.033 2.063 1.824 1.839 1.634 1.659
Reheat steam temperature ℃ 533.41 538.35 533.37 533.74 532.67 536.38 530.90 531.90
Reheated steam enthalpy kJ/kg 3538.4 3549.0 3540.5 3541.0 3541.0 3549.0 3539.0 3541.0
Reheated steam flow t/h 569.790 577.538 513.974 520.819 460.369 463.347 410.330 416.512
Height row's steam pressure MPa 2.557 2.595 2.311 2.344 2.076 2.094 1.859 1.889
Height row's vapor (steam) temperature ℃ 307.62 310.80 301.04 301.53 290.93 294.97 296.63 297.01
Height row's steam enthalpy kJ/kg 3027.4 3034.0 3018.5 3018.8 3001.4 3010.5 3021.2 3021.3
Cold steam flow again t/h 569.790 574.977 513.974 518.320 460.361 463.342 410.330 416.512
Exhaust steam pressure kPa 8.856 9.378 8.250 8.081 7.797 7.919 7.527 8.179
Feed pressure MPa 15.280 15.279 14.965 14.940 14.649 14.608 13.050 13.081
Feed temperature ℃ 244.82 245.89 240.22 240.81 234.73 235.55 230.17 231.38
Feed water enthalpy kJ/kg 1061.8 1066.8 1040.3 1043.0 1014.8 1018.5 993.3 998.9
Feedwater flow t/h 659.444 660.906 592.013 602.305 535.131 539.671 465.526 476.058
Desuperheating water of superheater flow t/h 6.155 11.461 7.426 3.716 1.649 1.685 11.060 9.406
Reheater attemperation water flow t/h 0 2.561 0 2.499 0 0 0 0
Low-pressure coal saver flow of inlet water t/h 326.499 / 268.407 / 249.993 / 188.429 /
Low-pressure coal saver inflow temperature ℃ 69.36 / 69.88 / 69.04 / 69.72 /
Low-pressure coal saver return water temperature ℃ 119.09 / 122.54 / 124.36 / 127.12 /
Test heat consumption rate kJ/kW·h 8505.2 8640.3 8522.3 8628.3 8564.6 8660.3 8665.8 8807.4
Electrical power after parameters revision MW 220.702 221.660 198.872 199.719 178.750 179.425 163.330 164.002
Heat consumption rate after parameters revision kJ/kW·h 8301.5 8418.4 8359.8 8467.1 8416.7 8517.9 8521.1 8624.7
Compared with prior art, the present invention haing the following advantages and effect：It is theoretical not that the present invention solves utilization " equivalent enthalpy drop " Can more accurate evaluation station boiler low-pressure coal saver energy-saving effect the problem of, using scene or replace the related meter in scene, pass through Thermal performance test, respectively test unit put into operation under different load operating mode and stoppage in transit low-pressure coal saver two states under performance Parameter, and calculating amendment is carried out, obtain putting into operation under low-pressure coal saver and stoppage in transit low-pressure coal saver two states, unit main steam flow The change curve of amount, electrical power and heat consumption rate, so as to evaluate the energy-saving effect of low-pressure coal saver under different electric load operating modes.This hair The evaluation analysis method of bright offer can accurately, intuitively evaluation analysis unit puts into operation the energy-saving effect of low-pressure coal saver, passes through The change of true measuring unit operating status, the more accurate unit that must evaluate put into operation the energy-saving effect of low-pressure coal saver, solve The problem of can only being analyzed and evaluated at present by " equivalent enthalpy drop " theory.
Brief description of the drawings
Fig. 1 is the Steam Turbine therrmodynamic system schematic diagram of the embodiment of the present invention.
Fig. 2 is the low-pressure economizer system structure diagram of the embodiment of the present invention.
Fig. 3 is putting into operation and stoppage in transit low-pressure coal saver main steam flow and heat consumption rate graph of relation for the embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawings and the present invention is described in further detail by embodiment, and following embodiments are to this hair Bright explanation and the invention is not limited in following embodiments.
Embodiment.
The step of assay method of low-pressure coal saver energy-saving effect in the present embodiment, is as follows：
The first step, several pressure, temperature, flow, electrical power are arranged in Steam Turbine therrmodynamic system, low-pressure economizer system Measuring point；Referring to Fig. 1, Fig. 2；
Second step, isolates system, is allowed to the insulation request for meeting thermal performance test；
3rd step, is put into operation, the contrast test for low-pressure coal saver of stopping transport, by open, close unit condensate system with it is low The valve between economizer system is pressed to realize, the other specification such as all same such as generator load, main vapour pressure, pitch aperture；
4th step, measurement main steam enthalpy, reheated steam enthalpy, the enthalpy that finally feeds water, cold reheated steam enthalpy, desuperheating water of superheater enthalpy, again Hot device desuperheating water enthalpy, #1 high plus steam admission enthalpy, #1 HP heater drainages enthalpy, #2 high plus steam admission enthalpy, #2 HP heater drainages enthalpy, #3 high add vapour Enthalpy, #3 HP heater drainages enthalpy, #1 high add water enthalpy, #1 high plus water outlet enthalpy, #2 high adds water enthalpy, #2 high plus water outlet enthalpy, #3 high are added Water enthalpy, #3 high plus water outlet enthalpy and generated output power；
5th step, measurement feedwater flow, the equivalent flow of boiler drum level change, desuperheating water of superheater flow, reheater subtract Warm water flow；
6th step, calculates that #3 high adds steam flow amount, #2 high adds steam flow amount and #1 high adds steam flow amount, #3 high add steam flow amount by Formula Ge1=Gfw×（i32- i31）/（in3- is3）It is calculated, #2 high adds steam flow amount by formula Ge2=[Gfw×（i22- i21）- Ge1（is3- is2）]/（in2- is2）It is calculated, #1 high adds steam flow amount by formula Ge3=[Gfw×（i12- i11）- （Ge1+ Ge2）×（is2- is1）]/（in1- is1）It is calculated；
7th step, utilizes formula Gms=Gfw+Gbl+GssCalculate main steam flow；
8th step, the sum of high pressure cylinder door rod and front and rear gland steam leakage rate are calculated according to the thermodynamic property of manufactory；
9th step, according to formula Gch=Gms-Ggl-Ge1-Ge2-Ge3Calculate cold reheated steam flow；
Tenth step, according to formula Grh=Gch+GrsCalculate reheated steam flow；
11st step, according to formula ((Gms-Gss)×(ims-ifw)+Gch×(irh-ich)+Gss×(ims-iss)+Grs×(irh- irs))/Pe calculating unit heat consumption rates；
12nd step, passes through to main steam pressure, main steam temperature, reheated steam temperature according to the fair curve that manufactory provides Degree, reheating pressure drop, condenser exhaust steam pressure are modified to obtain heat consumption rate after unit is corrected.
Wherein：imsTo measure main steam enthalpy；irhFor reheated steam enthalpy；ifwFor final feedwater enthalpy；ichFor cold reheated steam Enthalpy；issFor desuperheating water of superheater enthalpy；irsFor reheater desuperheating water enthalpy；in1For #1 high plus steam admission enthalpy；is1For #1 HP heater drainage enthalpys； in2For #2 high plus steam admission enthalpy；is2For #2 HP heater drainage enthalpys；in3For #3 high plus steam admission enthalpy；is3For #3 HP heater drainage enthalpys；i11For #1 Height adds water enthalpy；i12For #1 high plus water outlet enthalpy；i21Water enthalpy is added for #2 high；i22For #2 high plus water outlet enthalpy；i31Water is added for #3 high Enthalpy；i32For #3 high plus water outlet enthalpy；Pe is generated output power；GfwTo measure feedwater flow；GblChange for boiler drum level Equivalent flow；GssFor desuperheating water of superheater flow；GrsFor reheater attemperation water flow；Ge1Steam flow amount is added for #3 high；Ge2 Steam flow amount is added for #2 high；Ge3Steam flow amount is added for #1 high；GmsFor main steam flow；GglSteamed for high pressure cylinder door rod and front and rear axle envelope The sum of vapour leakage rate；GchFor cold reheated steam flow；GrhFor reheated steam flow；Ht is unit heat consumption rate.
List under unit difference electric load operating mode, put into operation, the result of the test of stoppage in transit low-pressure coal saver in table 1.
Put into operation under the different electric load operating modes of table 1, the result of the test of stoppage in transit low-pressure coal saver
Title Unit 220MW- puts into operation 220MW- stops transport 200MW- puts into operation 200MW- stops transport 180MW- puts into operation 180MW- stops transport 160MW- puts into operation 160MW- stops transport
Generator active power MW 219.517 219.756 199.791 199.729 179.836 179.835 159.838 159.880
Main steam pressure MPa 13.054 13.003 13.126 13.047 13.115 13.036 11.648 11.646
Main steam temperature ℃ 533.71 536.31 535.09 533.65 531.72 536.38 535.55 535.87
Main steam enthalpy kJ/kg 3426.2 3433.6 3429.0 3426.1 3420.3 3433.4 3446.4 3447.2
Main steam flow t/h 665.599 672.367 599.439 606.021 536.780 541.356 476.586 485.463
Reheated steam pressure MPa 2.249 2.284 2.033 2.063 1.824 1.839 1.634 1.659
Reheat steam temperature ℃ 533.41 538.35 533.37 533.74 532.67 536.38 530.90 531.90
Reheated steam enthalpy kJ/kg 3538.4 3549.0 3540.5 3541.0 3541.0 3549.0 3539.0 3541.0
Reheated steam flow t/h 569.790 577.538 513.974 520.819 460.369 463.347 410.330 416.512
Height row's steam pressure MPa 2.557 2.595 2.311 2.344 2.076 2.094 1.859 1.889
Height row's vapor (steam) temperature ℃ 307.62 310.80 301.04 301.53 290.93 294.97 296.63 297.01
Height row's steam enthalpy kJ/kg 3027.4 3034.0 3018.5 3018.8 3001.4 3010.5 3021.2 3021.3
Cold steam flow again t/h 569.790 574.977 513.974 518.320 460.361 463.342 410.330 416.512
Exhaust steam pressure kPa 8.856 9.378 8.250 8.081 7.797 7.919 7.527 8.179
Feed pressure MPa 15.280 15.279 14.965 14.940 14.649 14.608 13.050 13.081
Feed temperature ℃ 244.82 245.89 240.22 240.81 234.73 235.55 230.17 231.38
Feed water enthalpy kJ/kg 1061.8 1066.8 1040.3 1043.0 1014.8 1018.5 993.3 998.9
Feedwater flow t/h 659.444 660.906 592.013 602.305 535.131 539.671 465.526 476.058
Desuperheating water of superheater flow t/h 6.155 11.461 7.426 3.716 1.649 1.685 11.060 9.406
Reheater attemperation water flow t/h 0 2.561 0 2.499 0 0 0 0
Low-pressure coal saver flow of inlet water t/h 326.499 / 268.407 / 249.993 / 188.429 /
Low-pressure coal saver inflow temperature ℃ 69.36 / 69.88 / 69.04 / 69.72 /
Low-pressure coal saver return water temperature ℃ 119.09 / 122.54 / 124.36 / 127.12 /
Test heat consumption rate kJ/kW·h 8505.2 8640.3 8522.3 8628.3 8564.6 8660.3 8665.8 8807.4
Electrical power after parameters revision MW 220.702 221.660 198.872 199.719 178.750 179.425 163.330 164.002
Heat consumption rate after parameters revision kJ/kW·h 8301.5 8418.4 8359.8 8467.1 8416.7 8517.9 8521.1 8624.7
Pass through low-pressure coal saver and the two kinds of methods of operation of stoppage in transit low-pressure coal saver of under multiple operating modes to different tests load, putting into operation Tested, respectively draw the relation curve of a main steam flow and heat consumption rate, different main steamings can intuitively be checked in by relation curve Put into operation under steam flow amount and the difference of the heat consumption rate of stoppage in transit low-pressure coal saver, that is, the energy-saving effect for the low-pressure coal saver that puts into operation, wherein not wrapping The power consumption of the booster pump containing desulfurization.It is corresponding to stop under the main steam flow that the low-pressure coal saver that puts into operation is checked in further according to the relation curve Heat consumption rate value during low-pressure coal saver is transported, will put into operation and stop transport under low-pressure coal saver amendment to same main steam flow, obtain Heat consumption rate difference under each operating condition of test, is calculated gross coal consumption rate difference, while considers what the power consumption of desulfurization booster pump influenced Gross coal consumption rate, draws the gross coal consumption rate that unit is actually saved under different main steam flows.
Result of the test：
Tested by putting into operation with the heat consumption rate of each operating point of stoppage in transit low-pressure coal saver, draw put into operation and stoppage in transit low pressure province coal respectively The main steam flow of two kinds of methods of operation of device and heat consumption rate relation curve, as shown in Figure 3.
It will put into operation with stoppage in transit low-pressure coal saver amendment to same main steam flow, while considering desulfurization booster pump power consumption shadow Loud gross coal consumption rate, draws the gross coal consumption rate that unit is actually saved under different main steam flows, as shown in table 2.
Low-pressure coal saver energy-saving effect under the different operating modes of table 2
Title Unit 220MW- puts into operation 200MW- puts into operation 180MW- puts into operation 160MW- puts into operation
Main steam flow t/h 665.599 599.439 536.780 476.586
Put into operation low-pressure coal saver heat consumption rate kJ/kW·h 8301.5 8359.8 8416.7 8521.1
Stoppage in transit low-pressure coal saver heat consumption rate kJ/kW·h 8418.3 8456.5 8524.9 8620.2
Heat consumption rate difference kJ/kW·h 116.8 96.7 108.2 99.1
Convert gross coal consumption rate g/kW·h 4.42 3.65 4.09 3.74
Desulfurization booster pump power consumption kW 35.015 34.054 32.409 29.875
It is total to reduce gross coal consumption rate g/kW·h 4.36 3.59 4.02 3.67
Learnt by upper table result of calculation, unit main steam flow be respectively 665.599t/h, 599.439t/h, Under 536.780t/h, 476.586t/h operating mode, the low-pressure coal saver that puts into operation is relative to stoppage in transit low-pressure coal saver, unit heat consumption rate difference Decline 116.8kJ/kWh, 96.7kJ/kWh, 108.2kJ/kWh and 99.1kJ/kWh, consider the consumption of desulfurization booster pump Electricity, put into operation low-pressure coal saver when, unit generation coa consumption rate reduces 4.36g/kWh, 3.59g/kWh, 4.02g/kWh respectively And 3.67g/kWh.
Although the present invention is disclosed as above with embodiment, it is not limited to protection scope of the present invention, any to be familiar with The technical staff of this technology, changes and retouches what is made without departing from the spirit and scope of the invention, should all belong to this hair Bright protection domain.

Claims (7)

  1. A kind of 1. assay method of low-pressure coal saver energy-saving effect, it is characterised in that step is as follows：
    The first step, arranges several pressure, temperature, flow and electric work in Steam Turbine therrmodynamic system and low-pressure economizer system The measuring point of rate；
    Second step, isolates the Steam Turbine therrmodynamic system in the first step and low-pressure economizer system, it is met heating power The insulation request of performance test；
    3rd step, closes the valve that condensate system is connected with low-pressure economizer system, stoppage in transit low-pressure coal saver；In this case Carry out the thermal performance test of different load operating mode；
    4th step, opens the valve of connection condensate system and low-pressure economizer system, put into operation low-pressure coal saver；In this case Carry out the thermal performance test under different load operating mode；
    5th step, calculates the heat consumption rate of unit under different operating modes in two kinds of operating statuses of the 3rd step and the 4th step respectively, and carries out Parameters revision；The relation curve of heat consumption rate after drawing unit main steam flow respectively according to calculating correction result and correct, according to Two relation curves, are evaluated under same main steam flow, the energy-saving effect for the low-pressure coal saver that puts into operation.
  2. 2. the assay method of low-pressure coal saver energy-saving effect according to claim 1, it is characterised in that the described 3rd In step and the 4th step, generator load, main vapour pressure and pitch aperture all same.
  3. 3. the assay method of low-pressure coal saver energy-saving effect according to claim 1, it is characterised in that the described 3rd In the thermal performance test of step and the 4th step, including measurement main steam enthalpy, finally reheated steam enthalpy, feedwater enthalpy, cold reheated steam Enthalpy, desuperheating water of superheater enthalpy, reheater desuperheating water enthalpy, #1 high plus steam admission enthalpy, #1 HP heater drainages enthalpy, #2 high plus steam admission enthalpy, #2 high Add hydrophobic enthalpy, #3 high plus steam admission enthalpy, #3 HP heater drainages enthalpy, #1 high adds water enthalpy, #1 high plus water outlet enthalpy, #2 high adds water enthalpy, #2 Height plus water outlet enthalpy, #3 high add water enthalpy, #3 high plus water outlet enthalpy and generated output power.
  4. 4. the assay method of low-pressure coal saver energy-saving effect according to claim 1, it is characterised in that the described 3rd In the thermal performance test of step and the 4th step, including measurement feedwater flow, the equivalent flow of boiler drum level change, superheater Attemperation water flow and reheater attemperation water flow.
  5. 5. the assay method of low-pressure coal saver energy-saving effect according to claim 3, it is characterised in that the described 5th Step includes step is calculated as below：
    （1）#3 high adds steam flow amount, #2 high adds steam flow amount and #1 high adds steam flow amount for calculating, and #3 high adds steam flow amount by formula Ge1=Gfw×（i32- i31）/（in3- is3）It is calculated, #2 high adds steam flow amount by formula Ge2=[Gfw×（i22- i21）- Ge1 （is3- is2）]/（in2- is2）It is calculated, #1 high adds steam flow amount by formula Ge3=[Gfw×（i12- i11）- （Ge1+Ge2）× （is2- is1）]/（in1- is1）It is calculated；
    （2）Utilize formula Gms=Gfw+Gbl+GssCalculate main steam flow；
    （3）The sum of high pressure cylinder door rod and front and rear gland steam leakage rate are calculated according to the thermodynamic property of manufactory；According to public affairs Formula Gch=Gms-Ggl-Ge1-Ge2-Ge3Calculate cold reheated steam flow；
    （4）According to formula Grh=Gch+GrsCalculate reheated steam flow；
    （5）According to formula ((Gms-Gss)×(ims-ifw)+Gch×(irh-ich)+Gss×(ims-iss)+Grs×(irh-irs))/Pe Calculate unit heat consumption rate；
    （6）The fair curve provided according to manufactory, by main steam pressure, main steam temperature, reheat steam temperature, reheating Pressure drop and condenser exhaust steam pressure are modified to obtain the revised heat consumption rate of unit；
    （7）The relation curve of main steam flow and revised heat consumption rate under the 3rd step and the 4th step two states is drawn, by closing It is that curve is checked in and put into operation under different main steam flows and the difference of the heat consumption rate of stoppage in transit low-pressure coal saver；
    （8）According to（7）In relation curve, check under the main steam flow for the low-pressure coal saver that puts into operation, corresponding stoppage in transit low pressure Heat consumption rate value during economizer, obtains the heat consumption rate difference under each operating condition of test, gross coal consumption rate difference is calculated, examines at the same time Consider the gross coal consumption rate that the power consumption of desulfurization booster pump influences, draw the coal consumption for power generation that unit is actually saved under different main steam flows Rate；
    In above-mentioned formula：imsTo measure main steam enthalpy；irhFor reheated steam enthalpy；ifwFor final feedwater enthalpy；ichFor cold reheated steam Enthalpy；issFor desuperheating water of superheater enthalpy；irsFor reheater desuperheating water enthalpy；in1For #1 high plus steam admission enthalpy；is1For #1 HP heater drainage enthalpys； in2For #2 high plus steam admission enthalpy；is2For #2 HP heater drainage enthalpys；in3For #3 high plus steam admission enthalpy；is3For #3 HP heater drainage enthalpys；i11For #1 Height adds water enthalpy；i12For #1 high plus water outlet enthalpy；i21Water enthalpy is added for #2 high；i22For #2 high plus water outlet enthalpy；i31Water is added for #3 high Enthalpy；i32For #3 high plus water outlet enthalpy；Pe is generated output power；GfwTo measure feedwater flow；GblChange for boiler drum level Equivalent flow；GssFor desuperheating water of superheater flow；GrsFor reheater attemperation water flow；Ge1Steam flow amount is added for #3 high；Ge2 Steam flow amount is added for #2 high；Ge3Steam flow amount is added for #1 high；GmsFor main steam flow；GglSteamed for high pressure cylinder door rod and front and rear axle envelope The sum of vapour leakage rate；GchFor cold reheated steam flow；GrhFor reheated steam flow；Ht is unit heat consumption rate.
  6. 6. the assay method of the low-pressure coal saver energy-saving effect according to claim 3 or 4, it is characterised in that different The measurement meter that identical measuring point uses under operating mode is identical.
  7. 7. the assay method of low-pressure coal saver energy-saving effect according to claim 5, it is characterised in that different electricity are negative Put into operation under lotus operating mode, the result of the test of stoppage in transit low-pressure coal saver it is as follows：
    Title Unit 220MW- is thrown Fortune 220MW- stops transport 200MW- puts into operation 200MW- stops transport 180MW- puts into operation 180MW- stops transport 160MW- puts into operation 160MW- Stop transport Generator active power MW 219.517 219.756 199.791 199.729 179.836 179.835 159.838 159.880 Main steam pressure MPa 13.054 13.003 13.126 13.047 13.115 13.036 11.648 11.646 Main steam temperature ℃ 533.71 536.31 535.09 533.65 531.72 536.38 535.55 535.87 Main steam enthalpy kJ/kg 3426.2 3433.6 3429.0 3426.1 3420.3 3433.4 3446.4 3447.2 Main steam flow t/h 665.599 672.367 599.439 606.021 536.780 541.356 476.586 485.463 Reheated steam pressure MPa 2.249 2.284 2.033 2.063 1.824 1.839 1.634 1.659 Reheat steam temperature ℃ 533.41 538.35 533.37 533.74 532.67 536.38 530.90 531.90 Reheated steam enthalpy kJ/kg 3538.4 3549.0 3540.5 3541.0 3541.0 3549.0 3539.0 3541.0 Reheated steam flow t/h 569.790 577.538 513.974 520.819 460.369 463.347 410.330 416.512 Height row's steam pressure MPa 2.557 2.595 2.311 2.344 2.076 2.094 1.859 1.889 Height row's vapor (steam) temperature ℃ 307.62 310.80 301.04 301.53 290.93 294.97 296.63 297.01 Height row's steam enthalpy kJ/kg 3027.4 3034.0 3018.5 3018.8 3001.4 3010.5 3021.2 3021.3 Cold steam flow again t/h 569.790 574.977 513.974 518.320 460.361 463.342 410.330 416.512 Exhaust steam pressure kPa 8.856 9.378 8.250 8.081 7.797 7.919 7.527 8.179 Feed pressure MPa 15.280 15.279 14.965 14.940 14.649 14.608 13.050 13.081 Feed temperature ℃ 244.82 245.89 240.22 240.81 234.73 235.55 230.17 231.38 Feed water enthalpy kJ/kg 1061.8 1066.8 1040.3 1043.0 1014.8 1018.5 993.3 998.9 Feedwater flow t/h 659.444 660.906 592.013 602.305 535.131 539.671 465.526 476.058 Desuperheating water of superheater flow t/h 6.155 11.461 7.426 3.716 1.649 1.685 11.060 9.406 Reheater attemperation water flow t/h 0 2.561 0 2.499 0 0 0 0 Low-pressure coal saver flow of inlet water t/h 326.499 / 268.407 / 249.993 / 188.429 / Low-pressure coal saver inflow temperature ℃ 69.36 / 69.88 / 69.04 / 69.72 / Low-pressure coal saver return water temperature ℃ 119.09 / 122.54 / 124.36 / 127.12 / Test heat consumption rate kJ/ kW·h 8505.2 8640.3 8522.3 8628.3 8564.6 8660.3 8665.8 8807.4 Electrical power after parameters revision MW 220.702 221.660 198.872 199.719 178.750 179.425 163.330 164.002 Heat consumption rate after parameters revision kJ/ kW·h 8301.5 8418.4 8359.8 8467.1 8416.7 8517.9 8521.1 8624.7
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CN110348164A (en) * 2019-07-18 2019-10-18 国网山东省电力公司电力科学研究院 A kind of thermoelectricity unit is designed for the modification method of thermal condition figure
CN111666675A (en) * 2020-06-02 2020-09-15 西安热工研究院有限公司 Method for correcting and calculating thermal performance examination test of steam turbine with low-temperature economizer
CN112184043A (en) * 2020-10-10 2021-01-05 河北冀研能源科学技术研究院有限公司 Method for improving low-temperature economizer of heat supply unit and evaluating operation effect
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CN112700350A (en) * 2020-12-28 2021-04-23 润电能源科学技术有限公司 Method and device for calculating coal consumption of heat supply influence power supply of cogeneration unit

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