CN103487218A - Condenser vacuum leakproofness detecting system and method - Google Patents
Condenser vacuum leakproofness detecting system and method Download PDFInfo
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Abstract
The invention provides a condenser vacuum leakproofness detecting system and method. The detecting system comprises a vacuum pump, an air outlet measuring device and a computing device. The vacuum pump is connected with a condenser, the air outlet measuring device is installed on an air outlet pipe of an air-water separator of the vacuum pump, and the computing device is connected with the air outlet measuring device. The vacuum pump is used for discharging air leaking into the condenser and part of steam in the condenser, the air outlet measuring device is used for measuring the air content in a steam-air mixture discharged out of the air outlet pipe of the air-water separator of the vacuum pump, and the computing device generates a detection result about the vacuum leakproofness of the condenser according to the air content and a set condenser leakproofness standard. According to the condenser vacuum leakproofness detecting system and method, the vacuum leakproofness of the condenser can be accurately judged, and therefore a basis is provided for operation and maintenance strategy formulation of a unit. In addition, due to the fact that measurement is conducted at the air outlet position, normal operation of the unit will not be affected, and the situation that test accuracy is ensured at the cost of influencing stable operation of a power grid is avoided.
Description
Technical field
The invention belongs to thermal power plant's suction side system detection field, relate in particular to a kind of Tightness Property of Condenser Vacuum System detection system and method.
Background technology
Thermal power plant's suction side system is the system of a huge and more complicated, and its relevant device mainly comprises the equipment such as the condenser that moves under negative pressure and condensate pump associated therewith, water circulating pump, vacuum pump.So-called negative pressure, just refer to that condenser condenses in order to guarantee turbine discharge in therrmodynamic system " cold junction ", and need to maintain, it is certain for atmospheric force value.The main operational factor of thermal power plant's suction side has vacuum, vacuum tightness test findings, condensate water dissolved oxygen amount, condensate undercooling, end poor etc.Some parameter is as cleanliness etc., although be not main operational factor, its variation also can exert an influence to condenser.
The suction side equipment that the condenser of take is representative is the important utility appliance of thermal power plant, its runnability has a great impact the Steam Turbine thermal efficiency of cycle, the deterioration of negative pressure equipment duty in service will directly cause that thermal loss of steam turbine, the steam consumption increase and the decline of exerting oneself, for example a 200MW unit condenser vacuum descends 1%, cause that hear rate increases by the 0.029% about 58kW that generates electricity less, and 600MW unit condenser vacuum descends 1%, hear rate increases by the 0.05% about 306kW that generates electricity less.And according to the rules, when the condenser vacuum value drops to a certain degree and can not recover in time, must emergency stop, so the quality of suction side equipment running status not only has considerable influence to unit economy, to the safe operation of whole unit, be also a kind of threat.
The vacuum tightness test is the important tests that power plant is used for checking the condenser system tightness.According to " DL932-2005 condenser and vacuum system operation maintenance guide rule ", test method is: adjusting steam turbine load is the 80%-100% ratings, keep stable operation, close the condenser outlet portal of bleeding, the stoppage in transit air-extractor, pay close attention to condenser vacuum and change, vacuum descends when too fast and stops test.When valve is closed fully, start to record the decline rate of condenser vacuum.Test duration 8 minutes, every the numerical value of a vacuum of half a minute record, get the mean value of vacuum dropping speed of latter 5 minutes as trial value.
When power is greater than the unit of 100MW, vacuum dropping speed is not more than 270Pa/min, and power is less than the unit of 100MW, when vacuum dropping speed is not more than 400Pa/min, can think that leak test is qualified.The speed that vacuum descends is greater than above-mentioned standard, and its leak test is defective, and there is leak source in vacuum system, need to be searched leak detection.For Air-cooled Unit, according to " DT/T1052-2007 Energy Conservation Technical Supervision guide rule ", 300MW and following unit vacuum dropping speed be higher than 130Pa/min, the unit that 300MW is above, vacuum dropping speed during not higher than 100Pa/min, can think that leak test is qualified.
According to current vacuum tightness testing requirements, expect the vacuum tightness test figure of unit, just must carry out the vacuum tightness test.Each duration of test should keep the unit throttle flow constant, but in fact in the process of being tested, with regard to present circumstances, unit generally can't be tested special application for this reason and remove AGC and coordinate control, this just causes the unit throttle flow to change to some extent, and resulting leak test numerical value is inaccurate, Tightness Property of Condenser Vacuum System state that can not the complete reaction unit, if remove the controls such as AGC for the accuracy of testing, can have influence on again the safe and stable operation of electrical network.
Summary of the invention
Cause experimental result problem not exclusively accurately in order to solve current vacuum tightness test because air inflow changes, the embodiment of the present invention provides a kind of Tightness Property of Condenser Vacuum System detection method and system.
In order to achieve the above object, the embodiment of the present invention provides a kind of Tightness Property of Condenser Vacuum System detection system, and for detection of the tightness of condenser, described detection system comprises vacuum pump, exhausr port measurement mechanism and computing equipment; Described vacuum pump connects described condenser, and described exhausr port measurement mechanism is arranged on the gas outlet of moisture trap of described vacuum pump, and described computing equipment connects described exhausr port measurement mechanism; Described vacuum pump is discharged for the air of the described condenser that will bleed and the part steam of described condenser, the steam that described exhausr port measurement mechanism is discharged for the gas outlet of measuring the moisture trap that passes through described vacuum pump and the air content of air mixture; Described computing equipment, according to the condenser tightness standard of described air content and setting, generates the testing result to described Tightness Property of Condenser Vacuum System.
Further, in one embodiment, described exhausr port measurement mechanism comprises wind gage and temp .-humidity measuring apparatus; Described wind gage is for measuring the air mass flow at described gas outlet place, described temp .-humidity measuring apparatus is for measuring the humiture of air at described gas outlet place, described computing equipment, according to described air mass flow and humiture, calculates the air capacity that described vacuum pump is discharged.
Further, in one embodiment, the condenser tightness standard of described setting comprises: for water chiller and Air-cooled Unit, set respectively the corresponding relation of leaking-in air amount and opinion rating.
In order to achieve the above object, the embodiment of the present invention also provides a kind of Tightness Property of Condenser Vacuum System detection method, comprising: use vacuum pump that leaked-in air in described condenser is discharged; The steam that measurement is discharged by the gas outlet of the moisture trap of described vacuum pump and the air content in air mixture; According to the condenser tightness standard of described air content and setting, generate the testing result to described Tightness Property of Condenser Vacuum System.
Further, in one embodiment, the steam that described measurement is discharged by the gas outlet of the moisture trap of described vacuum pump and the air content in air mixture, comprising: the air mass flow of measuring described gas outlet place by wind gage; Measure the humiture of the air at described gas outlet place by temp .-humidity measuring apparatus; According to described air mass flow and humiture, calculate the air content that described vacuum pump is discharged.
Further, in one embodiment, the condenser tightness standard of described setting comprises: for water chiller and Air-cooled Unit, set respectively the corresponding relation of leaking-in air amount and opinion rating.
Tightness Property of Condenser Vacuum System detection system and the method for the embodiment of the present invention, solved current leak test because throttle flow changes the test findings problem not exclusively accurately that causes, can judge comparatively accurately the vacuum tightness of condenser, thereby formulate foundation is provided for the operation of unit and Strategies of Maintenance.And, owing to being measured in exhaust place, therefore can not affect the normal operation of unit, more can not affect for the accuracy of warranty test the stable operation of electrical network.
The accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, below will the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those skilled in the art, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
The structural representation of the Tightness Property of Condenser Vacuum System detection system that Fig. 1 is the embodiment of the present invention;
Fig. 2 is the method flow diagram that utilizes Tightness Property of Condenser Vacuum System detection system of the present invention to be detected.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Embodiment based in the present invention, those of ordinary skills, not making under the creative work prerequisite the every other embodiment obtained, belong to the scope of protection of the invention.
The technological means that the present invention adopts is mainly to adopt external measurement mechanism by the leaking-in air amount of the unit condenser of measurement, judge comparatively accurately the vacuum tightness state of condenser according to air leakage, solution causes the inaccurate problem of Tightness Property of Condenser Vacuum System test findings because unit throttle flow in existing process of the test changes, for the formulation of the method for operation of unit and turnaround plan provide according to and instruction, also can not affect the stable operation of unit and electrical network simultaneously.
The structural representation of the Tightness Property of Condenser Vacuum System detection system that Fig. 1 is the embodiment of the present invention.In the present embodiment, described detection system comprises vacuum pump 1, exhausr port measurement mechanism 2 and computing equipment 3; Described vacuum pump 1 connects described condenser, and described exhausr port measurement mechanism 2 is arranged on the gas outlet of moisture trap 1 ' of described vacuum pump 1, and described computing equipment 3 connects described exhausr port measurement mechanism 2.
Described vacuum pump 1 is discharged for the air of the described condenser that will bleed and the part steam of described condenser, the steam that described exhausr port measurement mechanism 2 is discharged for the gas outlet of measuring the moisture trap 1 ' that passes through described vacuum pump 1 and the air content of air mixture; Described computing equipment 3, according to the condenser tightness standard of described air content and setting, generates the testing result to described Tightness Property of Condenser Vacuum System.
In the present embodiment, as shown in Figure 2, described exhausr port measurement mechanism 2 comprises wind gage 21 and temp .-humidity measuring apparatus 22; Described wind gage 21 is for measuring the air mass flow at described gas outlet place, described temp .-humidity measuring apparatus 22 is for the humiture of the air of measuring described gas outlet place, described computing equipment 3, according to described air mass flow and humiture, calculates the air capacity that described vacuum pump is discharged.
The theory origin of in the present invention, carrying out the Tightness Property of Condenser Vacuum System detection is according to U.S.'s Heat Transfer Association recommended formula
g wherein
afor air leakage; V is the system equipment volume under vacuum state;
for rate of vacuum drop.Can find out, for the unit of different capabilities, under the level of identical vacuum tightness, air leakage is directly proportional to the volume of vacuum equipment.Therefore, in the present embodiment, for water chiller and Air-cooled Unit, set respectively the corresponding relation of leaking-in air amount and opinion rating.
By site test, can draw the leaking-in air amount of some form capacity unit of water chiller and Air-cooled Unit and the relation of vacuum tightness test, specifically in Table 1 and table 2.
Table 1 water chiller leaking-in air amount and leak test relation
Table 2 Air-cooled Unit leaking-in air amount and leak test relation
From test findings, be not difficult to find out, for the form described in top table 1, table 2 and the unit of capacity, the leak test result of unit and the substantially proportional relation of the data of leaking-in air amount, that is to say, Tightness Property of Condenser Vacuum System detection method and the system of the application of the invention, can carry out Measurement and analysis to the data of leaking-in air amount and replace vacuum tightness test and the relevant data analysis that current unit is daily carried out.
As can be seen from Table 1, for water chiller, if unit capacity is 125MW, the air capacity of the condenser that bleeds per hour is less than 3.1Kg, can judge that the vacuum tightness of condenser is as excellent; If bleed, the air capacity of condenser per hour is greater than 3.1Kg and is less than 5Kg, can judge that the vacuum tightness of condenser is as good; If bleed, the air capacity of condenser per hour is greater than 5Kg and is less than 10.5Kg, can judge that the vacuum tightness of condenser is as qualified; If bleed, the air capacity of condenser per hour is greater than 10.5Kg, can judge that the vacuum tightness of condenser is as defective.
In like manner, for the unit capacity of 300MW, if the air capacity of the condenser that bleeds per hour is less than 8Kg, can judge that the vacuum tightness of condenser is as excellent; If bleed, the air capacity of condenser per hour is greater than 8Kg and is less than 13Kg, can judge that the vacuum tightness of condenser is as good; If bleed, the air capacity of condenser per hour is greater than 13Kg and is less than 27Kg, can judge that the vacuum tightness of condenser is as qualified; If bleed, the air capacity of condenser per hour is greater than 27Kg, can judge that the vacuum tightness of condenser is as defective.
In like manner, for the unit capacity of 600MW, if the air capacity of the condenser that bleeds per hour is less than 40Kg, can judge that the vacuum tightness of condenser is as excellent; If bleed, the air capacity of condenser per hour is greater than 40Kg and is less than 55Kg, can judge that the vacuum tightness of condenser is as good; If bleed, the air capacity of condenser per hour is greater than 55Kg and is less than 75Kg, can judge that the vacuum tightness of condenser is as qualified; If bleed, the air capacity of condenser per hour is greater than 75Kg, can judge that the vacuum tightness of condenser is as defective.
As can be seen from Table 2, for Air-cooled Unit, if unit capacity is 300MW, the air capacity of the condenser that bleeds per hour is less than 11Kg, can judge that the vacuum tightness of condenser is as excellent; If bleed, the air capacity of condenser per hour is greater than 11Kg and is less than 17Kg, can judge that the vacuum tightness of condenser is as good; If bleed, the air capacity of condenser per hour is greater than 17Kg and is less than 33Kg, can judge that the vacuum tightness of condenser is as qualified; If bleed, the air capacity of condenser per hour is greater than 33Kg, can judge that the vacuum tightness of condenser is as defective.
In like manner, for the unit capacity of 600MW, if the air capacity of the condenser that bleeds per hour is less than 45Kg, can judge that the vacuum tightness of condenser is as excellent; If bleed, the air capacity of condenser per hour is greater than 45Kg and is less than 61Kg, can judge that the vacuum tightness of condenser is as good; If bleed, the air capacity of condenser per hour is greater than 61Kg and is less than 82Kg, can judge that the vacuum tightness of condenser is as qualified; If bleed, the air capacity of condenser per hour is greater than 82Kg, can judge that the vacuum tightness of condenser is as defective.
Utilize the air content that wind gage and temp .-humidity measuring apparatus record can calculate the leaking-in air amount hourly that is converted to, and contrasted with table 1 and table 2, generating testing result is " excellent ", " good ", " qualified " or " defective ".
Fig. 2 is the method flow diagram that utilizes Tightness Property of Condenser Vacuum System detection system of the present invention to be detected.As shown in the figure, the Tightness Property of Condenser Vacuum System detection method of the present embodiment comprises: step S101, used vacuum pump that leaked-in air in described condenser is discharged; Step S102, the steam that measurement is discharged by the gas outlet of the moisture trap of described vacuum pump and the air content in air mixture; Step S103, according to the condenser tightness standard of described air content and setting, generate the testing result to described Tightness Property of Condenser Vacuum System.
In the step S102 of the present embodiment, the steam that described measurement is discharged by the gas outlet of the moisture trap of described vacuum pump and the air content in air mixture, comprising: the air mass flow of measuring described gas outlet place by wind gage; Measure the humiture of the air at described gas outlet place by temp .-humidity measuring apparatus; According to described air mass flow and humiture, calculate the air content that described vacuum pump is discharged.
This method is added on surveying instrument on the gas outlet of vacuum pump moisture trap, because air and the sub-fraction steam of all condensers that bleed are all extracted out by vacuum pump, thereby, at the air content that the vacuum pump outlet vent pipe is measured in drawing steam and air mixture, be in operational process the air capacity of the condenser that bleeds.And can obtain corresponding with it leak test situation by this air capacity.
Below by a specific embodiment, the result of utilizing condenser leaked-in air amount to realize that vacuum tightness detects is verified and is estimated.
The assay object is 300MW unit water-cooled condenser of certain thermal power plant.The vacuum tightness test is identical with the two variation tendency of condenser air leakage, so consider that according to the difference of unit capacity, the index of its air leakage is not identical yet by wherein any is as parameter.Convenience in order to calculate, adopt vacuum to compare H in addition
actual/ H
designdo parameter.Therefore water chiller is selected to following representative index: the vacuum of condenser compares H
actual/ H
design, condensate undercooling δ
c, oxygen content of condensate C
a, condenser terminal difference δ
t, vacuum tightness X or leaking-in air amount.And, concerning Air-cooled Unit, because being carrys out cooling unit steam discharge with air, thereby select following representative index: the vacuum of condenser compares H
actual/ H
design, condensate undercooling δ
c, oxygen content of condensate C
a, vacuum tightness X or condenser air leakage.By having selected the index of these state evaluations, this sympotomatic set that is evaluated object of condenser has also just been established.
In the present embodiment, the operation conditions of this 300MW unit water-cooled condenser is: the vacuum actual value is 98% of vacuum design value, i.e. m=H
actual/ H
design=0.98, oxygen content of condensate C
a=25 μ g, condensate undercooling δ
cbe 1.8 ℃, leak test is X=300Pa/min as a result, and the leaking-in air amount is 31.6kg/h, condenser terminal difference δ
t=8 ℃.
The unified assay of employing based on fuzzy evaluation:
1. at first by the leak test result, as evaluation index, calculated:
Set up the fuzzy membership functions of each evaluation index of water chiller, after Fuzzy Calculation is processed, obtain the fuzzy relationship matrix r between symptom domain and state domain:
A=[0.5?0.1?0.1?0.1?0.2]
Bring in B=A ° of R and can be calculated: B=(0.5 0.4 0.2 0.2)
This result is carried out to normalized to be had: B'=(0.386 0.308 0.153 0.153)
From result of calculation, can find out, in the condenser running status, " excellent " accounts for 35.5%, " good " accounts for 53.8%,, " qualified " accounts for 10.7%, there is no " poor ", according to maximum membership grade principle, although unit vacuum tightness test findings is below qualified, because other parameter is all better, so all in all can think that current condenser running status is for " excellent ".
2. when by the leaking-in air amount during as the evaluation analysis index, fuzzy relation matrix is:
A=[0.5?0.1?0.1?0.1?0.2]
Bring in B=A ° of R and can be calculated: B=(0.5 0.4 0.2 0.2)
Result is identical when using before leak test as index, is also " excellent ".So find out, if had unit the leaking-in air amount concrete numerical value distribution situation and measure accurately, can replace vacuum tightness fully and test this index.
By above embodiment, can obtain, Tightness Property of Condenser Vacuum System detection system and the method for the embodiment of the present invention, solved current leak test because throttle flow changes the test findings problem not exclusively accurately that causes, can judge comparatively accurately the vacuum tightness of condenser, thereby formulate foundation is provided for the operation of unit and Strategies of Maintenance.And, owing to being measured in exhaust place, therefore can not affect the normal operation of unit, more can not affect for the accuracy of warranty test the stable operation of electrical network.
Those skilled in the art should understand, embodiments of the invention can be provided as method, system or computer program.Therefore, the present invention can adopt complete hardware implementation example, implement software example or in conjunction with the form of the embodiment of software and hardware aspect fully.And the present invention can adopt the form that wherein includes the upper computer program of implementing of computer-usable storage medium (including but not limited to magnetic disk memory, CD-ROM, optical memory etc.) of computer usable program code one or more.
Applied specific embodiment in the present invention principle of the present invention and embodiment are set forth, the explanation of above embodiment is just for helping to understand method of the present invention and core concept thereof; , for one of ordinary skill in the art, according to thought of the present invention, all will change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention simultaneously.
Claims (6)
1. a Tightness Property of Condenser Vacuum System detection system, the tightness for detection of condenser, is characterized in that, described detection system comprises vacuum pump, exhausr port measurement mechanism and computing equipment;
Described vacuum pump connects described condenser, and described exhausr port measurement mechanism is arranged on the gas outlet of moisture trap of described vacuum pump, and described computing equipment connects described exhausr port measurement mechanism;
Described vacuum pump is discharged for the air of the described condenser that will bleed and the part steam of described condenser, the steam that described exhausr port measurement mechanism is discharged for the gas outlet of measuring the moisture trap that passes through described vacuum pump and the air content of air mixture;
Described computing equipment, according to the condenser tightness standard of described air content and setting, generates the testing result to described Tightness Property of Condenser Vacuum System.
2. Tightness Property of Condenser Vacuum System detection system according to claim 1, is characterized in that, described exhausr port measurement mechanism comprises wind gage and temp .-humidity measuring apparatus;
Described wind gage is for measuring the air mass flow at described gas outlet place, described temp .-humidity measuring apparatus is for measuring the humiture of air at described gas outlet place, described computing equipment, according to described air mass flow and humiture, calculates the air capacity that described vacuum pump is discharged.
3. Tightness Property of Condenser Vacuum System detection system according to claim 1, is characterized in that, the condenser tightness standard of described setting comprises:
For water chiller and Air-cooled Unit, set respectively the corresponding relation of leaking-in air amount and opinion rating.
4. a Tightness Property of Condenser Vacuum System detection method, is characterized in that, described detection method comprises:
Use vacuum pump that leaked-in air in described condenser is discharged;
The steam that measurement is discharged by the gas outlet of the moisture trap of described vacuum pump and the air content in air mixture;
According to the condenser tightness standard of described air content and setting, generate the testing result to described Tightness Property of Condenser Vacuum System.
5. Tightness Property of Condenser Vacuum System detection method according to claim 4, is characterized in that, the steam that described measurement is discharged by the gas outlet of the moisture trap of described vacuum pump and the air content in air mixture comprise:
Measure the air mass flow at described gas outlet place by wind gage;
Measure the humiture of the air at described gas outlet place by temp .-humidity measuring apparatus;
According to described air mass flow and humiture, calculate the air content that described vacuum pump is discharged.
6. Tightness Property of Condenser Vacuum System detection method according to claim 4, is characterized in that, the condenser tightness standard of described setting comprises:
For water chiller and Air-cooled Unit, set respectively the corresponding relation of leaking-in air amount and opinion rating.
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| CN110455460B (en) * | 2019-08-21 | 2020-12-11 | 辽宁科技大学 | Method for quickly checking leakage of cooler of air cooling system of gas turbine |
| CN110455460A (en) * | 2019-08-21 | 2019-11-15 | 辽宁科技大学 | The method of the quick leakage detection of gas turbine air cooling system cooler |
| CN110849553A (en) * | 2019-10-14 | 2020-02-28 | 四川神华天明发电有限责任公司 | Vacuum tightness test control method and device and electronic equipment |
| CN112504583A (en) * | 2020-10-28 | 2021-03-16 | 天津大唐国际盘山发电有限责任公司 | Method for on-line checking tightness of negative pressure region of full-vacuum condensate pump |
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| CN113639935B (en) * | 2021-06-22 | 2023-09-22 | 国家能源(山东)工程技术有限公司 | Vacuum tightness detection system and method for condensing steam turbine unit |
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| CN113465825B (en) * | 2021-06-29 | 2024-07-05 | 西安热工研究院有限公司 | Logic control method for tightness test of coaxial steam turbine valve of circulating unit |
| CN114739580A (en) * | 2022-04-21 | 2022-07-12 | 苏州西热节能环保技术有限公司 | System and method for monitoring air leakage of negative pressure system through drainage pipeline |
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