CN102393306B - Method for judging cool end loss and diagnosing energy saving potential of steam turbine - Google Patents
Method for judging cool end loss and diagnosing energy saving potential of steam turbine Download PDFInfo
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Abstract
The invention provides a method for judging the cool end loss and diagnosing the energy saving potential of a steam turbine. The method is realized through the following steps: the steam exhaust volume flow and the actual efficiency of a low-pressure cylinder of the steam turbine can be calculated as per the operation statistical data of two parameters including machine set load and condenser pressure; and quantitative judgment of the cool end loss of the steam turbine can be carried out through the difference comparison of the steam exhaust volume flow and the actual efficiency with the highest efficiency point of the low-pressure cylinder. The method can be further used for evaluating the energy saving potential of the output increasing caused by the cold end operational parameter regulation of the steam turbine, so that the optimal regulation direction of the cool end parameter of the steam turbine can be confirmed.
Description
Technical field
The present invention relates to the thermal power generating technology field, in particular, relate to a kind of Turbine Cold Junction loss and differentiate the method for diagnosing with energy-saving potential.
Background technology
In the thermal power generation unit, the acting amount of large-size steam turbine low pressure (LP) cylinder accounts for about 40% of whole steam turbine power, and the height of its operational efficiency has directly determined the economy level of Steam Turbine.Difference according to turbine low pressure cylinder steam discharge volume flow demand, steam turbine manufacturing plant generally can be equipped with the discrepant exhaust stage blade of some length and corresponding low pressure (LP) cylinder module for the unit of a certain capacitance grade, wherein long exhaust stage blade is corresponding to bigger volume flow, and short exhaust stage blade is corresponding to less volume flow.Normally, when low pressure (LP) cylinder steam discharge volume flow increases (or minimizing) 20%, should consider to change exhaust stage blade and be the low pressure (LP) cylinder module of longer (or shorter), be complementary with flow area and the steam discharge volume flow that guarantees the low pressure (LP) cylinder exhaust stage blade, realize the efficient operation of turbine low pressure cylinder.
In the design and bid stage of fired power generating unit equipment, according to conditions of work such as the unit load of generating plant user expection, condenser pressures, the low pressure (LP) cylinder module of a certain final blade length type generally can be recommended to select for use by steam turbine manufacturing plant.Yet, after fired power generating unit drops into actual motion, because unit load, condenser pressure off-design desired value, cause the corresponding change of turbine low pressure cylinder steam discharge volume flow, the real work point that may cause low pressure (LP) cylinder to draw according to the whole year operation parametric statistics can not be in the efficient region of design, form the Turbine Cold Junction loss therefrom, yet can't directly whether rationally differentiate low pressure (LP) cylinder and exhaust stage blade type selecting in the actual production, and shortage is to the guidance of optimizing and revising of cold junction operational factor.
Summary of the invention
In view of this, the invention provides the loss of a kind of Turbine Cold Junction and differentiate method with the energy-saving potential diagnosis, can't be directly whether low pressure (LP) cylinder and exhaust stage blade type selecting are rationally differentiated and lacked problems of optimizing and revising such as guidance to the cold junction operational factor to solve in the prior art.
For achieving the above object, the invention provides following technical scheme:
The method with the energy-saving potential diagnosis is differentiated in a kind of Turbine Cold Junction loss, it is characterized in that, comprising:
Obtain second relation curve and little the 3rd relation curve of exerting oneself that increases of unit load, condenser pressure and unit of first relation curve, low pressure (LP) cylinder steam discharge volume flow and the low pressure (LP) cylinder efficient of unit load, condenser pressure and low pressure (LP) cylinder steam discharge volume flow;
Obtain unit load mean value and the condenser pressure mean value of unit predetermined period, calculate the unit load modified value according to the difference of described condenser pressure and design basis value;
According to mean value and first relation curve of described unit load modified value, described condenser pressure, obtain the actual row steam space flow of low pressure (LP) cylinder; According to actual row steam space flow and second relation curve of described low pressure (LP) cylinder, obtain the actual efficiency of low pressure (LP) cylinder; Calculate the actual efficiency of described low pressure (LP) cylinder and the difference of top efficiency, the exhaust stage blade acting amount that multiply by described low pressure (LP) cylinder according to described difference accounts for the ratio of steam turbine power, obtain the fall of unit efficiency, the fall of described unit efficiency is lost numerical representation method with Turbine Cold Junction;
According to described unit load, described condenser pressure numerical value and the 3rd relation curve, actual little the increasing that obtains unit exerted oneself; Increase according to described unit actual little and to exert oneself and expect that little increasing exert oneself, obtain the energy-saving potential of Turbine Cold Junction.
Preferably, the obtaining step of described first relation curve, second relation curve and the 3rd relation curve is specially:
By changing steam turbine thermal test and the calculating of condenser pressure under the different unit load conditions, determine the little Changing Pattern of exerting oneself that increases of low pressure (LP) cylinder steam discharge volume flow, low pressure (LP) cylinder efficient and unit.
Preferably, predetermined period is the unit operation cycle described in the mean value of the described unit load that obtains the unit predetermined period and condenser pressure, is cycle unit with " year ".
Via above-mentioned technical scheme as can be known, compared with prior art, the invention provides a kind of Turbine Cold Junction loss and differentiate the method for diagnosing with energy-saving potential, whole year operation statistics according to unit load, these two parameters of condenser pressure, reckoning draws turbine low pressure cylinder steam discharge volume flow and actual efficiency, and by with the diversity ratio of low pressure (LP) cylinder best efficiency point, quantitative identification is made in loss to Turbine Cold Junction; This method can also cause that little energy-saving potential that increases of exerting oneself makes assessment to the adjustment of Turbine Cold Junction operational factor, determines that the Turbine Cold Junction Parameter Optimization adjusts direction, thereby brings bigger economic benefit for fired power generating unit.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, to do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, accompanying drawing in describing below only is embodiments of the invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to the accompanying drawing that provides.
The method flow diagram with the energy-saving potential diagnosis is differentiated in a kind of Turbine Cold Junction loss that Fig. 1 provides for the embodiment of the invention;
Fig. 2 is first graph of relation that embodiment of the invention mesolow cylinder steam discharge volume flow random groups load, condenser pressure change;
Fig. 3 is that the invention process mesolow cylinder efficient is with second graph of relation of low pressure (LP) cylinder steam discharge variation of volumetric flow;
Fig. 4 increases the 3rd graph of relation of exerting oneself and changing with load, condenser pressure for unit in the embodiment of the invention is little.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that obtains under the creative work prerequisite.
The invention provides a kind of Turbine Cold Junction loss and differentiate the method for diagnosing with energy-saving potential, comprise step:
S101: " first relation curve ", the low pressure (LP) cylinder efficient of obtaining low pressure (LP) cylinder steam discharge volume flow random groups load, condenser pressure variation are exerted oneself with " the 3rd relation curve " of loading, condenser pressure changes with " second relation curve " and little the increasing of unit of low pressure (LP) cylinder steam discharge variation of volumetric flow;
S102: obtain unit load mean value and the condenser pressure operation mean value of unit in a cycle of operation;
S103A: according to the mean value of described unit load modified value, condenser pressure, look into and get " first relation curve ", obtain the actual row steam space flow of low pressure (LP) cylinder;
S104A: look into again and get " second relation curve ", obtain the actual efficiency of low pressure (LP) cylinder;
S105A: calculate the actual efficiency of described low pressure (LP) cylinder and the difference of top efficiency, multiply by the ratio that described low pressure (LP) cylinder acting amount accounts for steam turbine power according to described difference, obtain the fall of unit efficiency, be Turbine Cold Junction loss numerical value.
S103B: according to described unit load, condenser pressure numerical value, look into and get " the 3rd relation curve ", obtain actual little the increasing of unit and exert oneself;
S104B: if unit load, condenser pressure parameter are adjusted, little the increasing that then obtains expection from " the 3rd relation curve " exerted oneself;
S105B: little desired value and the actual value that increases power of unit compared, obtain its improvement amplitude, be the energy-saving potential of taking the adjustment of cold junction operational factor to obtain.
On the basis of the embodiment that the invention described above provides, now enumerate an instantiation as an illustration.
Obtain unit load and the condenser pressure operation mean value of unit in a cycle of operation, the described cycle of operation can also can decide according to actual demand for being unit with " year ", and present embodiment was to give an example in the cycle with 1 year, and detail parameters is referring to table 1.
Table 1
According to the actual operating data in each month of table 1, calculate the average of the whole year value of condenser pressure and unit operation load, understand for convenience, operational factor collection and modification method are provided below, show as table 2:
Table 2
| Sequence number | The measuring point title | Variable name | Unit | Preparation method |
| ? | The condenser design pressure | Pd | kPa | The designs fix value |
| ? | The condenser operating pressure | Pc | kPa | The operation statistical value |
| ? | The unit operation load | Power | MW | The operation statistical value |
| ? | Unit correction afterload | Power_c | MW | Power_c=Power×（1＋Pc-Pd）/100） |
Steam turbine according to 50%, 100% load condition becomes the back pressure experimental result again, and is as shown in table 3, draws first relation curve of low pressure (LP) cylinder steam discharge volume flow random groups load, condenser pressure variation, as Fig. 2; Low pressure (LP) cylinder efficient is with second relation curve of low pressure (LP) cylinder steam discharge variation of volumetric flow, as Fig. 3; Little the 3rd relation curve of exerting oneself and changing with load, condenser pressure that increases of unit is as Fig. 4.
Table 3
According to the mean value of described unit load modified value, condenser pressure, look into and get " first relation curve ", obtain the actual row steam space flow of low pressure (LP) cylinder, look into again and get " second relation curve ", obtain the actual efficiency of low pressure (LP) cylinder; Calculate the actual efficiency of described low pressure (LP) cylinder and the difference of top efficiency, multiply by the ratio that described low pressure (LP) cylinder acting amount accounts for steam turbine power according to described difference, obtain the fall of unit efficiency, be Turbine Cold Junction loss numerical value; According to described unit load, condenser pressure numerical value, look into and get " the 3rd relation curve ", obtain actual little the increasing of unit and exert oneself; If unit load, condenser pressure parameter are adjusted, little the increasing that then obtains expection from " the 3rd relation curve " exerted oneself; Little desired value and the actual value that increases power of unit compared, obtain its improvement amplitude, be the energy-saving potential of taking the adjustment of cold junction operational factor to obtain.
In sum: compared with prior art, the invention provides a kind of Turbine Cold Junction loss and differentiate the method for diagnosing with energy-saving potential, whole year operation statistics according to unit load, these two parameters of condenser pressure, reckoning draws turbine low pressure cylinder steam discharge volume flow and actual efficiency, and by with the diversity ratio of low pressure (LP) cylinder best efficiency point, quantitative identification is made in loss to Turbine Cold Junction; This method can also cause that little energy-saving potential that increases of exerting oneself makes assessment to the adjustment of Turbine Cold Junction operational factor, determines that the Turbine Cold Junction Parameter Optimization adjusts direction, thereby brings bigger economic benefit for fired power generating unit.
Above-mentioned explanation to the embodiment that provides makes this area professional and technical personnel can realize or use the present invention.Multiple modification to these embodiment will be apparent concerning those skilled in the art, and defined General Principle can realize under the situation that does not break away from the spirit or scope of the present invention in other embodiments herein.Therefore, the present invention will can not be restricted to these embodiment shown in this article, but principle and the features of novelty the wideest consistent scope that provides with this paper will be provided.
Claims (3)
1. the method for diagnosing with energy-saving potential is differentiated in a Turbine Cold Junction loss, it is characterized in that, comprising:
Obtain second relation curve and little the 3rd relation curve of exerting oneself that increases of unit load, condenser pressure and unit of first relation curve, low pressure (LP) cylinder steam discharge volume flow and the low pressure (LP) cylinder efficient of unit load, condenser pressure and low pressure (LP) cylinder steam discharge volume flow;
Obtain unit load mean value and the condenser pressure mean value of unit predetermined period, calculate the unit load modified value according to the difference of described condenser pressure and design basis value;
According to mean value and first relation curve of described unit load modified value, described condenser pressure, obtain the actual row steam space flow of low pressure (LP) cylinder; According to actual row steam space flow and second relation curve of described low pressure (LP) cylinder, obtain the actual efficiency of low pressure (LP) cylinder; Calculate the actual efficiency of described low pressure (LP) cylinder and the difference of top efficiency, the exhaust stage blade acting amount that multiply by described low pressure (LP) cylinder according to described difference accounts for the ratio of steam turbine power, obtain the fall of unit efficiency, the fall of described unit efficiency is lost numerical representation method with Turbine Cold Junction;
According to described unit load, described condenser pressure numerical value and the 3rd relation curve, actual little the increasing that obtains unit exerted oneself; Increase according to described unit actual little and to exert oneself and expect that little increasing exert oneself, obtain the energy-saving potential of Turbine Cold Junction.
2. method according to claim 1 is characterized in that, the obtaining step of described first relation curve, second relation curve and the 3rd relation curve is specially:
By changing steam turbine thermal test and the calculating of condenser pressure under the different unit load conditions, determine the little Changing Pattern of exerting oneself that increases of low pressure (LP) cylinder steam discharge volume flow, low pressure (LP) cylinder efficient and unit.
3. according to the described method of claim 1, it is characterized in that predetermined period is the unit operation cycle described in the mean value of the described unit load that obtains the unit predetermined period and condenser pressure, is cycle unit with " year ".
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| CN106096869B (en) * | 2016-07-20 | 2019-08-23 | 浙江浙能技术研究院有限公司 | A kind of evaluation method of low pressure (LP) cylinder Tong Liao area energy-saving effect |
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