CN107907005B - A kind of monitoring method of direct air cooled condenser fin heat-transfer surface clean conditions - Google Patents
A kind of monitoring method of direct air cooled condenser fin heat-transfer surface clean conditions Download PDFInfo
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- CN107907005B CN107907005B CN201710949899.5A CN201710949899A CN107907005B CN 107907005 B CN107907005 B CN 107907005B CN 201710949899 A CN201710949899 A CN 201710949899A CN 107907005 B CN107907005 B CN 107907005B
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
- F28G15/00—Details
- F28G15/003—Control arrangements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28B—STEAM OR VAPOUR CONDENSERS
- F28B11/00—Controlling arrangements with features specially adapted for condensers
Abstract
The invention discloses a kind of monitoring methods of direct air cooled condenser fin heat-transfer surface clean conditions, carry out the test and calculating of direct air cooled condenser fin heat-transfer surface ventilation quantity under two states, i.e. cleaning normal condition and normal operating condition；Compare the ventilation quantity data operated normally under calculated ventilation quantity and air cooling tubes condenser clean conditions, exceeds 10% as ventilation quantity reduction is relatively low, then direct air cooled condenser fin heat-transfer surface is dirty more serious, is cleaned.Direct air cooled condenser fin heat-transfer surface ventilation quantity is calculated using the formula of this method offer, the monitoring problem of direct air cooled condenser fin clean conditions can be solved by the continuous monitoring of ventilation quantity, is run for power plant and maintenance provides accurate quantitative data；Using the monitoring method of direct air cooled condenser fin heat-transfer surface clean conditions, the dirty abnormality real-time perfoming of direct air cooled condenser can be monitored, meet the needs of economy of power plant analysis.
Description
Technical field
The present invention relates to a kind of monitoring methods of direct air cooled condenser fin heat-transfer surface clean conditions.
Background technique
Direct air cooled condenser carries as the most important heat exchange equipment of power plant's Direct Air-cooled Unit by unit steam discharge
Heat spreader to environment critical function.As electric power unit develops to high capacity high parameter, direct air cooled condenser in power plant
Working performance it is increasing to the economic influence of power plant.It is air-cooled solidifying by taking a certain 600MW Direct Air-cooled Unit steam turbine as an example
Vapour device pressure 1 kPa of every raising, will directly increase power plants generating electricity coal consumption about 1g/kWh.But Direct Air-Cooled condensing is influenced at present
The dirty state parameter of the heat exchanger surface of device performance does not still carry out Quantitative Monitoring and assessment effective in section, therefore for power plant
The Evaluation on Energy Saving of air cooling unit there is a problem of one it is larger.
The condenser type of cooling: the wet type type of cooling wet type type of cooling divides direct cooling and 2 kinds of cooling tower.Wet type direct current
Cooling is usually to collect the water that must be measured as cooling water in the natural waters such as the Congjiang, river, lake, sea, and cooling technique centrifuge is drawn
It takes waste heat to increase water temperature, then is discharged into river, river, lake, sea.When not having direct cooling condition, then need with cooling tower come cold
But.The effect of cooling tower is will to carry under one's arms the cooling water of waste heat in Ta Nei and air progress heat exchange, and waste heat is made to be transferred to air simultaneously
Spill into atmosphere.
Dry calibration mode is augmented in water-deficient area because damaging big water very problem in cooling procedure, cold using air
But mode can handle this problem well.In Air-cooling Process, the heat exchange of air and water (or steam discharge), be by by
The spreader surface heat transfer of metal tube composition, by the heat transmission of the water (or steam discharge) in pipe to air movable outside radiator.
Currently, the air cooling system for power plant mainly has 3 kinds, i.e., direct air cooling system, belt surface formula condenser indirect air cooling system
System (Harmon dry-cooling system) and the indirect air cooling system (Hai Leshi air cooling system) with injecting type (obscuring formula) condenser.Directly
Air-cooled is the exhaust directly condensed using air from steam turbine, and air carries out heat interchange by radiator with exhaust.Hai Leshi
Indirect air cooling system is mainly formed by injection type condenser with the air cooling tower equipped with good fortune brother's type radiator, in the high-purity in system
Property water enter condenser and directly mix merger with condenser steam discharge and send the condensed water Jue great department after heating to air cooling heat radiator, top
Cooling water after the heat exchange of end, which is sent again to injection type condenser, carries out next circulation.Few a part of neutral water is punished via essence disposition
Send the water circulation system of boiler and steam turbine after penalizing back to.Harmon formula indirect air cooling system is also known as the indirect air cooling of belt surface formula condenser
System, cooling water is to leave with boiler feed water within the system, so ensures that boiler feedwater quality.Harmon dry-cooling system
It is made of surface condenser and air cooling tower, system and the humid-cool system of general rule are incomparably similar.Mesh place is air-cooled in the world according to statistics
In the installed capacity of system, direct air cooling system accounts for about 43%, and Indirect Dry Cooling System with Surface Condenser accounts for about 24%, mixes desk-top
Condenser indirect air cooling system accounts for about 33%.
It is directly cooled down in air cooling tubes condenser by air by the working principle turbine discharge of air cooling system and condenses into water, arranged
Heat between vapour and air, which exchanges, to be completed in surface-type air cooling tubes condenser.In Direct Air-Cooled heat exchange course, using heat dissipation
The thermal medium squeezed in condenser from the steam turbine under vacuum condition is saturated and steams by the cold air flowed through on the outside of device finned tube
Vapour condensation, condensed consolidation water sends boiler back to after processing finally.
The growth of the effect Direct Air-Cooling Technology of direct air cooled condenser mainly curl up direct air cooled condenser restrain into
Capable.Air cooling tubes condenser is the cold major part really of air cooling unit, and turbine discharge narrowly all will be condensed into condenser
Condensed water.The steam of steam turbine discharge flows in condenser finned-tube bundle, and air is flowed outside condenser finned tube for steaming
Vapour is directly cooling.It leaves, carry out forced ventilation equipped with electric fan unit generally below control or incites somebody to action from cooling efficiency angle is improved
Tube bank is built in natural ventilative tower, and in the unit of existing operation, forced ventilation mode is preferably waited due to its controllable function
Place and throughout application.Direct air cooled condenser carries out technology in countries, the world gradually and studies intensively and gradually since characteristic is prominent
It promotes and applies.Directly, cost height, maintenance more by air condenser system stud link chain are paid since indirect air cooling condenser system is opposite
Amount is big, operation difficulty is big and reliability is poor, be it will only water-cooled condenser system and direct air cooled condenser system it
Between a transition, direct air cooled condenser will be nervous direction that later electric power plant cooling system develops.
The hair of direct air cooled condenser shows the history of shape Electric Factory Air-Cooling condenser technology opened up using existing decades.
Germany just built up to use air cooled generating set early in nineteen thirty-nine.Nineteen fifty, Hungarian Hai Le taught first proposition
Power station indirect air cooling technical ability, the development of power station air cooling technology by now resume by can not the ripe development process to maturation.It is empty
The finned tubular radiator of cooling system is had by material point: 3 kinds of aluminum pipe aluminium wing, steel pipe aluminium wing and steel pipe steel wing.By cloth score of the game, now
What air cooling system was widely used has 4 kinds: round aluminum pipe inlays aluminum fin-stock, galvanizing oval steel pipe sleeve rectangular fin, major diameter hot dipping
Zinc oval steel pipe sleeve rectangular fin, major diameter flat tube weld snake type aluminum fin-stock.The important development of Direct Air-Cooling Technology is to encircle directly
Connect what air cooling tubes condenser supervisor carried out, finned tube used in air cooling tubes condenser is substantially that the zinc-plated oval steel pipe in surface adds at present
Steel fin or circular steel pipe add aluminum fin-stock.In the 1960s, direct air cooled condenser technology development early stage, due to by
The internal diameter of the restriction of processing technology, finned tube is smaller, and single tube length is short, and tube bank number of rows is more.Due to the tube bank air of multiple rows of composition
(steam) stream can die area, and heat exchange area is unable to not as good as being used plentifully, and gas-flow resistance is big；The dead area in restraining
Sign easily rise winter operation when be easy freeze.Therefore, Direct Air-Cooling Technology is fundamentally all compared in single-machine capacity small at that time
It is utilized in hair electrical equipment unit.80 days of 20th century, finned tube design and manufacturing technology are all greatly improved, and caliber and length are all
It has been increased that, finned tube base tube diameter has spread over 50mm or more in this, and therefore, pipe row also correspondingly eliminates, and presents single
Pipe.Single row of tubes include heat exchange area using enrich, atmosphere effluent dynamic resistance is small, be not easy to freeze, manufacture easy and low cost isometric
Place is conducive to that air cooling unit is facilitated to develop to the deviation of large-sized unit.And then air cooling tubes condenser technology does not stop paying out exhibition and its technology
And the advantages of economic aspect, the utilization for being direct air cooling system on large sized unit have been laid a foundation firm bottom, air cooling technique is
Approval is suffered from more and more countries and is used.
It is most direct to influence to be to make condenser when the dirty situation of air cooling tubes condenser heat exchanger surface deteriorates in normal operation
Heat-transfer surface fin clearance reduces, and causes ventilation section reduction and blower cooling air quantity to reduce, finally directly affects air cooling tubes condenser
Pressure.In actual motion, the difficulty of the dirty state parameter of heat exchanger surface is calculated in section using the direct gauging surface coefficient of heat transfer
Very big, the measurement difficulty of relevant parameter is spent, therefore it is infeasible for directly acquiring the dirty state parameter of heat exchanger surface.
Therefore there is an urgent need to a kind of monitoring methods of direct air cooled condenser fin heat-transfer surface clean conditions to solve at present
The problem of.
Summary of the invention
The object of the present invention is to provide a kind of monitoring methods of direct air cooled condenser fin heat-transfer surface clean conditions, are used for
Direct air cooled condenser fin heat-transfer surface clean conditions are monitored, is the performance diagnogtics of Turbine Cold Junction system, power plant is instructed to run
Important reference data is provided.
To achieve the goals above, the technical solution adopted by the present invention is as follows:
A kind of monitoring method of direct air cooled condenser fin heat-transfer surface clean conditions, comprising the following steps:
Step 1, in the case where direct air cooled condenser cleans normal condition, stoppage in transit direct air cooled condenser fin cleaning system,
And direct air cooled condenser fan operation frequency is made to be maintained at rated value 50Hz, measurement obtains the operation number of cleaning normal condition
According to；
Step 2, under direct air cooled condenser normal operating condition, stoppage in transit direct air cooled condenser fin cleaning system,
And direct air cooled condenser fan operation frequency is made to be maintained at rated value 50Hz, measurement obtains the operation number of normal operating condition
According to；
Step 3 measures gained operation data according to step 1 and calculates the logical of direct air cooled condenser under cleaning normal condition
Air quantity q1；
Step 4 measures gained operation data according to step 2 and calculates the logical of direct air cooled condenser under normal operating condition
Air quantity qt；
Step 5, the ventilation quantity q of direct air cooled condenser under cleaning normal condition obtained by comparison step three1With step 4 institute
Obtain the ventilation quantity q of direct air cooled condenser under normal operating condition2, operating status ventilation quantity q if normal2Lower than cleaning benchmark shape
Ventilation quantity q under state1And it is relatively low exceed a certain percentage, then direct air cooled condenser fin heat-transfer surface is dirty more serious, need into
Row cleaning.
Further, it includes: cleaning normal condition ring that above-mentioned steps one, which obtain the operation data of the cleaning normal condition,
Border atmospheric pressure p1, cleaning normal condition direct air cooled condenser import environment temperature t1It is solidifying with cleaning normal condition Direct Air-Cooled
Vapour device blower becomes import power P1。
Further, it includes: normal operating condition ring that above-mentioned steps two, which obtain the operation data of the normal operating condition,
Border atmospheric pressure p2, normal operating condition direct air cooled condenser import environment temperature t2It is solidifying with normal operating condition Direct Air-Cooled
Vapour device blower becomes import power P2。
Further, the ventilation quantity q of direct air cooled condenser under normal condition is cleaned in above-mentioned steps three1Calculating process
Are as follows: according to cleaning normal condition environment atmospheric pressure p1, cleaning normal condition direct air cooled condenser import environment temperature t1With it is clear
Clean normal condition direct air cooled condenser blower becomes import power P1, calculate and obtain direct air cooled condenser under cleaning normal condition
Ventilation quantity q1, calculating formula is as follows:
According to atmospheric density characteristic, there are following relationships:
It can be obtained by formula (2) and formula (3):
In formula, P is that air cooling tubes condenser blower becomes import power, unit kW；ρ is fan inlet atmospheric density, and unit is
kg/m3；P is environment atmospheric pressure, unit kPa；T is directly to press air cooling tubes condenser import environment temperature, and unit is DEG C；Q is straight
By the ventilation quantity of air cooling tubes condenser, unit m3/h；Footmark " g " is that air cooling tubes condenser guarantees design point parameter；Footmark " 1 " is
Air cooling tubes condenser cleans the surveyed parameter of normal condition, and n is coefficient, takes 0.33；
Air cooling tubes condenser guarantees the parameters under design point, such as environment atmospheric pressure pg, condenser import environment temperature
Spend tg, blower change import power PgIt is known quantity, can be checked in by the technical data sheet that producer provides.
Further, in above-mentioned steps two under normal operating condition direct air cooled condenser ventilation quantity qtCalculating process
Are as follows: according to normal operating condition environment atmospheric pressure p2, normal operating condition direct air cooled condenser import environment temperature t2Just
Normal operating status direct air cooled condenser blower becomes import power P2, calculate and obtain direct air cooled condenser under normal operating condition
Ventilation quantity q2, calculating formula is as follows:
According to atmospheric density characteristic, there are following relationships:
It can be obtained by formula (6) and formula (7):
In formula, P is that air cooling tubes condenser blower becomes import power, unit kW；ρ is fan inlet atmospheric density, and unit is
kg/m3；P is environment atmospheric pressure, unit kPa；T is direct air cooled condenser import environment temperature, and unit is DEG C；Q is straight
Meet the ventilation quantity of air cooling tubes condenser, unit m3/h；Footmark " g " is that air cooling tubes condenser guarantees design point parameter；Footmark " 2 " is
The surveyed parameter of air cooling tubes condenser normal operating condition, n are coefficient, take 0.33；
Air cooling tubes condenser guarantees the parameters under design point, such as environment atmospheric pressure pg, condenser import environment temperature
Tg is spent, it is known quantity that blower, which becomes import power P g, can be checked in by the technical data sheet that producer provides.
Further, the direct air cooled condenser cleaning normal condition operation data measurement selection is in Direct Air-Cooled condensing
When device major overhaul, and to the fin heat-transfer surface of air cooling tubes condenser carried out thorough high pressure water rinse and mechanical chipping it is laggard
Row.
Further, the direct air cooled condenser normal operating condition operation data measurement selection is in Direct Air-Cooled condensing
It is carried out when device unit operates normally and direct air cooled condenser unit operating load stablizes.
Further, normal operating condition ventilation quantity q2 is lower than cleaning base in the dirty judgement of condenser fin heat-transfer surface
The percentage of ventilation quantity q1 is 10% under quasi- state.
Further, in the characteristic derivation of equation of the ventilation quantity of blower consumption power and direct air cooled condenser, it is based on wind
Fan static efficiency, gear efficiency, the vacation that blower becomes efficiency, fan frequency converter efficiency remains unchanged when machine ventilation quantity changes
It is fixed.
Compared with prior art, obtained by the present invention to have the beneficial effect that:
The invention patent mainly passes through measurement atmospheric pressure, air cooling tubes condenser by the way of indirect measurement and calculating
Import environment temperature, air cooling tubes condenser blower become import power parameter, and it is solidifying to calculate Direct Air-Cooled using the formula that this method provides
Direct air cooled condenser fin can be solved by the continuous monitoring of ventilation quantity in operating normally in vapour device fin heat-transfer surface ventilation quantity
The monitoring problem of clean conditions, runs for power plant and maintenance provides accurate quantitative data；Using direct air cooled condenser wing
The monitoring method of piece heat-transfer surface clean conditions can monitor the dirty abnormality real-time perfoming of direct air cooled condenser, meet
The needs of economy of power plant analysis.
Specific embodiment
Further details of narration is carried out to the present invention below.
A kind of monitoring method of direct air cooled condenser fin heat-transfer surface clean conditions, comprising the following steps:
Step 1, in the case where direct air cooled condenser cleans normal condition, stoppage in transit direct air cooled condenser fin cleaning system,
And direct air cooled condenser fan operation frequency is made to be maintained at rated value 50Hz, measurement obtains the operation number of cleaning normal condition
According to data include: cleaning normal condition environment atmospheric pressure p1, cleaning normal condition direct air cooled condenser import environment temperature
T1 and cleaning normal condition direct air cooled condenser blower become import power P 1；
Step 2, under direct air cooled condenser normal operating condition, stoppage in transit direct air cooled condenser fin cleaning system,
And direct air cooled condenser fan operation frequency is made to be maintained at rated value 50Hz, measurement obtains the operation number of normal operating condition
According to data include: normal operating condition environment atmospheric pressure p2, normal operating condition direct air cooled condenser import environment temperature
T2 and normal operating condition direct air cooled condenser blower become import power P 2；
Step 2 measures gained operation data according to step 1 and calculates the logical of direct air cooled condenser under cleaning normal condition
Air quantity q1；
According to cleaning normal condition environment atmospheric pressure p1, cleaning normal condition direct air cooled condenser import environment temperature
T1 and cleaning normal condition direct air cooled condenser blower become import power P 1, calculate and obtain Direct Air-Cooled under cleaning normal condition
The ventilation quantity q1 of condenser, calculating formula are as follows:
According to atmospheric density characteristic, there are following relationships:
It can be obtained by formula (2) and formula (3):
In formula, P is that air cooling tubes condenser blower becomes import power, unit kW；ρ is fan inlet atmospheric density, and unit is
kg/m3；P is environment atmospheric pressure, unit kPa；T is direct air cooled condenser import environment temperature, and unit is DEG C；Q is straight
Meet the ventilation quantity of air cooling tubes condenser, unit m3/h；Footmark " g " is that air cooling tubes condenser guarantees design point parameter；Footmark " 1 " is
Air cooling tubes condenser cleans the surveyed parameter of normal condition, and n is coefficient, takes 0.33；
Air cooling tubes condenser guarantees the parameters under design point, such as environment atmospheric pressure pg, condenser import environment temperature
Spend tg, blower change import power PgIt is known quantity, can be checked in by the technical data sheet that producer provides.
Step 4 measures gained operation data according to step 2 and calculates the logical of direct air cooled condenser under normal operating condition
Air quantity qt；
According to normal operating condition environment atmospheric pressure p2, normal operating condition direct air cooled condenser import environment temperature
t2Become import power P with normal operating condition direct air cooled condenser blower2, calculate and obtain Direct Air-Cooled under normal operating condition
The ventilation quantity q of condenser2, calculating formula is as follows:
According to atmospheric density characteristic, there are following relationships:
It can be obtained by formula (6) and formula (7):
In formula, P is that air cooling tubes condenser blower becomes import power, unit kW；ρ is fan inlet atmospheric density, and unit is
kg/m3；P is environment atmospheric pressure, unit kPa；T is direct air cooled condenser import environment temperature, and unit is DEG C；Q is straight
Meet the ventilation quantity of air cooling tubes condenser, unit m3/h；Footmark " g " is that air cooling tubes condenser guarantees design point parameter；Footmark " 2 " is
The surveyed parameter of air cooling tubes condenser normal operating condition, n are coefficient, take 0.33；Air cooling tubes condenser guarantees the items under design point
Parameter, such as environment atmospheric pressure pg, condenser import environment temperature tg, blower change import power PgIt is known quantity, it can be by producer
The technical data sheet of offer checks in.
Step 5, the ventilation quantity q of direct air cooled condenser under cleaning normal condition obtained by comparison step two1With step 4 institute
Obtain the ventilation quantity q of direct air cooled condenser under normal operating condition2, operating status ventilation quantity q if normal2Lower than cleaning benchmark shape
Ventilation quantity q under state1And it is relatively low exceed a certain percentage, then direct air cooled condenser fin heat-transfer surface is dirty more serious, need into
Row cleaning.
The direct air cooled condenser cleaning normal condition operation data measurement selection is big in direct air cooled condenser unit
When repairing, and the fin heat-transfer surface of air cooling tubes condenser carry out after thorough high pressure water flushing and mechanical chipping.It is described
Direct air cooled condenser normal operating condition operation data measures selection straight by air cooling tubes condenser unit normal operation and direct
Air cooling tubes condenser unit operating load carries out when stablizing.Normal operating condition is logical in the dirty judgement of condenser fin heat-transfer surface
Air quantity q2Lower than ventilation quantity q under cleaning normal condition1Percentage be 10%.Blower consumes power and direct air cooled condenser
In the characteristic derivation of equation of ventilation quantity, fan static efficiency, gear efficiency, blower become effect when based on the variation of blower ventilation amount
The hypothesis that rate, fan frequency converter efficiency remain unchanged.
This test method data collected are easy measurement, and judgment method is succinct, convenient to carry out, can be for directly by air-cooled solidifying
The performance state monitoring of vapour device provides a kind of reliable method.
The invention patent uses direct air cooled condenser fin heat-transfer surface ventilation quantity, as monitoring direct air cooled condenser wing
The judge index of piece clean conditions.The direct air cooled condenser fin heat-transfer surface ventilation quantity being calculated using this patent method,
Caused ventilation quantity variation when comprehensive consideration direct air cooled condenser running environment condition variation.The invention patent measures
As follows with the principle of calculating: in normal operation, when the dirty situation of air cooling tubes condenser heat exchanger surface deteriorates, most direct influence is
Reduce condenser heat-transfer surface fin clearance, causes ventilation section reduction and blower cooling air quantity to reduce, finally directly affect sky
Cold condenser pressure.In actual motion, it is dirty that heat exchanger surface is calculated and then directly measuring air cooling tubes condenser relevant parameter
State parameter it is difficult, therefore this patent use using direct air cooled condenser fin heat-transfer surface ventilation quantity be used as between by anti-
Reflect the judge index of air cooling tubes condenser fin clean conditions.And the variation of ventilation quantity is most directly reflected in air cooling tubes condenser blower
In the variation of total power consumption, therefore it can be supervised by the measurement air cooling tubes condenser blower change other environmental parameters of import power knot platform
The variation of air cooling tubes condenser fin heat-transfer surface ventilation quantity is surveyed, and then monitors air cooling tubes condenser fin heat-transfer surface clean conditions.
The beneficial effects of adopting the technical scheme are that the invention patent is using the side for measuring and calculating indirectly
Formula mainly becomes import power ginseng by measurement atmospheric pressure, air cooling tubes condenser import environment temperature, air cooling tubes condenser blower
Number calculates direct air cooled condenser fin heat-transfer surface ventilation quantity using the formula that this method provides, by divulging information in operating normally
The monitoring problem of direct air cooled condenser fin clean conditions can be solved in the continuous monitoring of amount, runs for power plant and maintenance provides
Accurate quantitative data；It, can be to Direct Air-Cooled using the monitoring method of direct air cooled condenser fin heat-transfer surface clean conditions
The dirty abnormality real-time perfoming of condenser monitors, and meets the needs of economy of power plant analysis.
Embodiment described above is merely a preferred embodiment of the present invention, and the simultaneously exhaustion of the feasible implementation of non-present invention.It is right
For persons skilled in the art, any aobvious to made by it under the premise of without departing substantially from the principle of the invention and spirit and
The change being clear to should be all contemplated as falling within the scope of claim conservation of the invention.
Claims (7)
1. a kind of monitoring method of direct air cooled condenser fin heat-transfer surface clean conditions, it is characterised in that the following steps are included:
Step 1, in the case where direct air cooled condenser cleans normal condition, stoppage in transit direct air cooled condenser fin cleaning system, and make
Direct air cooled condenser fan operation frequency is maintained at rated value 50Hz, and measurement obtains the operation data of cleaning normal condition；
Step 2, under direct air cooled condenser normal operating condition, stoppage in transit direct air cooled condenser fin cleaning system, and make
Direct air cooled condenser fan operation frequency is maintained at rated value 50Hz, and measurement obtains the operation data of normal operating condition；
Step 3 measures the ventilation quantity that gained operation data calculates direct air cooled condenser under cleaning normal condition according to step 1
q1；
Step 4 measures the ventilation quantity that gained operation data calculates direct air cooled condenser under normal operating condition according to step 2
q2；
Step 5, the ventilation quantity q of direct air cooled condenser under cleaning normal condition obtained by comparison step three1Just with step 4 gained
The ventilation quantity q of direct air cooled condenser under normal operating status2, if normal under operating status direct air cooled condenser ventilation quantity q2
Lower than the ventilation quantity q of direct air cooled condenser under cleaning normal condition1And relatively low exceed a certain percentage, then Direct Air-Cooled condensing
Device fin heat-transfer surface is dirty more serious, is cleaned；
The ventilation quantity q of direct air cooled condenser under normal condition is cleaned in step 31Calculating process are as follows: according to cleaning normal condition
Environment atmospheric pressure p1, cleaning normal condition direct air cooled condenser import environment temperature t1With cleaning normal condition Direct Air-Cooled
Condenser blower becomes import power P1, calculate the ventilation quantity q for obtaining direct air cooled condenser under cleaning normal condition1, calculating formula is such as
Under:
According to atmospheric density characteristic, there are following relationships:
It can be obtained by formula (2) and formula (3):
In formula, P is that direct air cooled condenser blower becomes import power, unit kW；ρ is fan inlet atmospheric density, and unit is
kg/m3；P is environment atmospheric pressure, unit kPa；T is direct air cooled condenser import environment temperature, and unit is DEG C；Q is straight
Meet the ventilation quantity of air cooling tubes condenser, unit m3/h；Footmark g is that direct air cooled condenser guarantees design point parameter；Footmark 1 is
Direct air cooled condenser cleans the surveyed parameter of normal condition, and n is coefficient, takes 0.33；
The direct air cooled condenser guarantees design point parameter: environment atmospheric pressure pg, direct air cooled condenser import environment temperature
Spend tg, direct air cooled condenser blower change import power PgIt is known quantity, can be checked in by the technical data sheet that producer provides；
In step 4 under normal operating condition direct air cooled condenser ventilation quantity q2Calculating process are as follows: according to normal operating condition
Environment atmospheric pressure p2, normal operating condition direct air cooled condenser import environment temperature t2With normal operating condition Direct Air-Cooled
Condenser blower becomes import power P2, calculate the ventilation quantity q for obtaining direct air cooled condenser under normal operating condition2, calculating formula is such as
Under:
According to atmospheric density characteristic, there are following relationships:
It can be obtained by formula (6) and formula (7):
In formula, P is that direct air cooled condenser blower becomes import power, unit kW；ρ is fan inlet atmospheric density, and unit is
kg/m3；P is environment atmospheric pressure, unit kPa；T is direct air cooled condenser import environment temperature, and unit is DEG C；Q is straight
Meet the ventilation quantity of air cooling tubes condenser, unit m3/h；Footmark g is that direct air cooled condenser guarantees design point parameter；Footmark 2 is
The surveyed parameter of direct air cooled condenser normal operating condition, n are coefficient, take 0.33；
The direct air cooled condenser guarantees design point parameter: environment atmospheric pressure pg, direct air cooled condenser import environment temperature
Spend tg, direct air cooled condenser blower change import power PgIt is known quantity, can be checked in by the technical data sheet that producer provides.
2. a kind of monitoring method of direct air cooled condenser fin heat-transfer surface clean conditions according to claim 1, special
Sign is: the operation data that step 1 obtains the cleaning normal condition includes: cleaning normal condition environment atmospheric pressure p1, it is clear
Clean normal condition direct air cooled condenser import environment temperature t1Become import with cleaning normal condition direct air cooled condenser blower
Power P1。
3. a kind of monitoring method of direct air cooled condenser fin heat-transfer surface clean conditions according to claim 1, special
Sign is: the operation data that step 2 obtains the normal operating condition includes: normal operating condition environment atmospheric pressure p2, just
Normal operating status direct air cooled condenser import environment temperature t2Become import with normal operating condition direct air cooled condenser blower
Power P2。
4. a kind of monitoring method of direct air cooled condenser fin heat-transfer surface clean conditions according to claim 1, special
Sign is: the direct air cooled condenser cleaning normal condition operation data measurement selection is in direct air cooled condenser major overhaul
When, and the fin heat-transfer surface of direct air cooled condenser carry out after thorough high pressure water flushing and mechanical chipping.
5. a kind of monitoring method of direct air cooled condenser fin heat-transfer surface clean conditions according to claim 1, special
Sign is: the direct air cooled condenser normal operating condition operation data measurement selection is normal in direct air cooled condenser unit
It is carried out when operation and stable direct air cooled condenser unit operating load.
6. a kind of monitoring method of direct air cooled condenser fin heat-transfer surface clean conditions according to claim 1, special
Sign is: in the dirty judgement of condenser fin heat-transfer surface under normal operating condition direct air cooled condenser ventilation quantity q2It is low
In the ventilation quantity q for cleaning direct air cooled condenser under normal condition1Percentage be 10%.
7. a kind of monitoring method of direct air cooled condenser fin heat-transfer surface clean conditions according to claim 1, special
Sign is: direct air cooled condenser blower becomes import power and the ventilation quantity of direct air cooled condenser is passing through formula calculating process
In, fan static efficiency, gear efficiency, blower become efficiency when based on the variation of blower ventilation amount, fan frequency converter efficiency is protected
Hold constant hypothesis.
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