CN101324457A - Intelligent detection method of steam tiny flow quantity - Google Patents
Intelligent detection method of steam tiny flow quantity Download PDFInfo
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- CN101324457A CN101324457A CNA2007101123761A CN200710112376A CN101324457A CN 101324457 A CN101324457 A CN 101324457A CN A2007101123761 A CNA2007101123761 A CN A2007101123761A CN 200710112376 A CN200710112376 A CN 200710112376A CN 101324457 A CN101324457 A CN 101324457A
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Abstract
The invention discloses an intelligent steam micro-flow detection method, which comprises the following steps: firstly, carrying out calibration and calculation according to a time-temperature curve in a rear pipe or a separated cylinder of a total steam inlet valve according to the detection and the requirement of a control process when cutting off a steam source; determining the calibration scheme selection positions (0 represents no micro-flow detection, 1 represents the scheme 1, 2 represents the scheme 2, and 3 represents the scheme 3), a temperature reduction value t, a set temperature reduction time m and the set smallest temperature value C not considering the micro-flow set in an instrument; detecting the micro-flow accordingly, and determining that no micro-flow is present when the actually measured temperature reduction value is larger than the set temperature reduction value t; a micro-flow is present when the actually measured temperature reduction value is smaller than the set temperature reduction value; and outputting and displaying the comparison result, carrying out flow rate control, alarming, etc. When an instantaneous flow rate F is larger than 0, the instrument can display the integration through the normal function of a flow meter. The method is implemented in a flow meter consisting of a single chip computer, thus improving the economic benefit and hot net management level in enterprises, solving the social problem of energy waste and achieving remarkably wide application prospect.
Description
One, technical field
The present invention relates to a kind of detection method that superheated vapor and saturated vapour tiny flow quantity exist that detects, be applied to real-time, onlinely judge whether steam valve is closed fully and had or not the run, drip, leak phenomenon.
Two, background technology
What be commonly used to measure steam has various ways flowmeters such as differential pressure, vortex street.But the flow measurement of steam device of don't work any advanced technology, dependable performance, the present situation of current flux meter can guarantee measuring accuracy in the range width range of instrument, but at the range lower limit, error is still bigger.When flow is very little, the small-signal excision function that will overcome the drift influence of interference, transmitter or sensor or be provided with for the normal operation of dependable flow meter systems because of flowmeter.Instrument is handled by null value when being lower than the particular flow rate value, and instrument is normally moved when being higher than this value.JJG 1003-2005 " flow integrator rules " regulation: supporting sensor is the standard restriction device, and the excision point should be not more than 8% of maximum flow under the design conditions; Supporting sensor is other type, and sensor excision point should be not more than 5% of maximum flow under the design conditions.So when the flowmeter indicating value of null value processing was zero, not representing did not just have flow.
We actually have steam circulation to this this moment, are tiny flow quantity but the instrument instantaneous delivery is shown as zero.This is the tiny flow quantity of medium with steam, has not only caused certain potential safety hazard to the heat supply network safe operation with the production of hot enterprise, life, and has caused bigger error in dipping, brings the energy and economic loss significantly.The fast development of particularly current cogeneration of heat and power enterprise and heat supply situation is difficult to control tiny flow quantity because of technical, has caused a series of problem of management.
1. there is tiny flow quantity in its pipe network internal cause, within a certain period of time, still has higher pressure, temperature, and the ponding that gets off because of condensation simultaneously reuses steam and has in various degree water attack, brings the potential safety hazard of personnel and equipment.
2. in the heat supply network, the special-purpose consciously tiny flow quantity method of user is with heat, causes gratuitously not measure with heat.
3. in the heat supply network, user's valve fits badly or is not related to, the steam that the normal heat radiation of run, drip, leak that cause and a pipe network self will replenish, and its waste is seriously refused again to improve.
4. caliber is big more, can not form differential pressure or pulse more during tiny flow quantity, and its tiny flow quantity is big more, loses also big more.
Influence the factor of tiny flow quantity size, relate to a lot of aspects.It follows design, the installation of instrument, the diameter of pipeline, and the sensitivity of sensor, the pipe networks in the character of fluid media (medium) and instrument downstream etc. are all multifactor relevant.This is a complexity and be difficult to metering, and loss is very big, has proposed very thorny technical barrier to heating enterprise.
Three, summary of the invention
Can not distinguish after null value is handled the actual deficiency whether tiny flow quantity is arranged in order to overcome existing flowmeter.The invention provides a kind of intelligent detection method of steam tiny flow quantity.At first at instantaneous delivery F=0 and when cutting off the vapour source fully, according to time-temperature curve and the CONTROL PROCESS requirement in pipeline or the gas-distributing cylinder behind the total inlet valve that detects and draw, demarcate and calculate, (0-does not have small amount of flow measuring to determine to be set in demarcation Scheme Choice position in the instrument; 1--scheme one; 2--scheme two; 3--scheme three), cooling value t, set temperature fall time m and set and do not consider the minimum temperature value C of tiny flow quantity, and detect tiny flow quantity according to this; When instantaneous delivery F＞0, instrument normally shows integrating with the function of flowmeter.Concrete grammar is:
(1) in pipeline after desire is measured total inlet valve of tiny flow quantity or the gas-distributing cylinder point for measuring temperature is installed,
(2) when the tiny flow quantity point for measuring temperature reaches with hot maximum temperature, close total inlet valve fully, detect and make the point for measuring temperature time-temperature curve figure of place.
(3) time-temperature curve of step (2) is selected the demarcation scheme, and temperature fall time m and cooling value t and minimum temperature C value between definite straight slope and per 2.
(4) with demarcation Scheme Choice position and temperature fall time m and the cooling value t and the minimum temperature C data input instrument of step (3), store stand-by.
(5) the current measurement temperature data of instrument deposits storer A in, and with minimum temperature C value relatively, when A＜C value, flowmeter normally shows integrating, otherwise measures the zone at temperature place according to this moment, temperature fall time m and cooling value t that selection has been stored, detect tiny flow quantity, and in temperature fall time m monitoring instantaneous delivery F, when F＞0, stop tiny flow quantity and detect, flowmeter normally shows integrating in accordance with regulations.
(6) the result output that will detect tiny flow quantity show, flow control, warning etc.
Technical scheme:
The demarcation of cooling curve: when the tiny flow quantity point for measuring temperature reaches with hot maximum temperature, close the vapour source fully, demarcate the time-temperature variation curve of point for measuring temperature on pipeline behind total inlet valve or the gas-distributing cylinder.Get 2 specific points on the inherent curve in certain hour zone, connect the slope of 2 straight lines, be the linear scale factor k of cooling value Δ t and temperature fall time Δ m:
Δ t=k Δ m formula 1
According to the needed time Δ m of the formula 1 Theoretical Calculation unit of obtaining cooling value (general Δ t=1 ℃), i.e. Δ m=l/k or the temperature value Δ t that fallen according to the 1 Theoretical Calculation unit interval of formula (general Δ m=1 minute), i.e. Δ t=k.The cooling value unit of getting 1 still is the temperature fall time unit of getting 1, determines according to actual detected technology.The influence of changing factors such as the coefficient of heat transfer of consideration pipeline or gas-distributing cylinder, environment temperature, for guarantee to stablize, reliability, in instrument temperature fall time or the setting of cooling value parameter, multiply by a factor of assurance, below is that Theoretical Calculation temperature fall time Δ m, cooling value Δ t and instrument are set temperature fall time m, set the relation between the cooling value t.When setting t=1 ℃ of cooling value, set temperature fall time so:
m＝(1.0～2.0)*Δm
=(1.0～2.0) * l/k formula 2
Or set temperature fall time m=1 minute, set the cooling value so:
t＝(1.0～1/2)*b
=(1.0～1/2) * k formula 3
Determining of minimum temperature C value: on time-temperature variation curve, in the point that the certain hour zone is got, any of horizontal ordinate minimum is as the reference point of minimum temperature value C.Measurement temperature below reference point, meaningless to the detection of tiny flow quantity.
From above analysis as can be known, actual (time, temperature) coordinate that records on the curve of demarcating or curve below, that does not have tiny flow quantity certainly.
According to time-temperature curve and CONTROL PROCESS, set cooling value t, set temperature fall time m and set determining of minimum temperature value C:
1 demarcation of scheme is as Fig. 3
Get at 2 and ask slope k on time-temperature curve: the horizontal ordinate of any is this maximum temperature value that can reach with vapour point, after another horizontal ordinate is decrease temperature and pressure (to 0.15MPa), and about 110 ± 5 ℃ of the minimum temperature points under the saturated-vapor state.The tiny flow quantity of promptly main consideration parameter under steam condition, the aquosity part no longer considers to have or not tiny flow quantity.
The judgement of tiny flow quantity: the curve of 2 demarcation, instrument have three to treat artificial setting value: temperature fall time m, cooling value t and minimum temperature value C.Instrument when in a single day detection instantaneous delivery F is zero, requires to measure temperature drop value and reaches regulation cooling value t in this linearity region in cumulative time m, if detect the cooling value more than or equal to setting cooling value t, no tiny flow quantity is described; If detect the cooling value less than regulation cooling value t, illustrating has tiny flow quantity to exist this moment.In time m, whether detect instantaneous delivery simultaneously greater than zero, if instantaneous delivery is greater than zero at this moment, then instrument stops the judgement to steam tiny flow quantity, presses normal discharge and shows integrating.
When measuring temperature, can not consider that this moment, steam had or not tiny flow quantity less than 110 ± 5 ℃ of left and right sides of setting minimum temperature C value.
Two or three demarcation of scheme are as Fig. 4
Temperature lowering curve is resolved into two sections, i.e. steam dome and hydrothermal area, first horizontal ordinate is got this maximum temperature that can reach with vapour point; Second horizontal ordinate is got about 110 ± 5 ℃ of minimum points under the saturated-vapor state of steam cooling step-down (to 0.15MPa) back; Horizontal ordinate is thirdly taken the high ambient temperature of focus+about 10 ℃.The straight line of determining according to two zones is given different temperature fall time m and cooling value t then.Which district is instrument elder generation detected temperatures judge in, judges flow process according to scheme one tiny flow quantity then, detects to have or not tiny flow quantity.The setting minimum temperature value C of this moment be about (environment temperature+10) ℃, when the temperature that detects is worth near this, stops the tiny flow quantity detection.
Three or four demarcation of scheme are as Fig. 5
Temperature lowering curve is resolved into three sections, i.e. overheated zone, saturation region and hydrothermal area, first horizontal ordinate is got the maximum temperature that this can reach with vapour point in the overheated zone; Saturation temperature under second the horizontal ordinate heat-obtaining net top pressure; After horizontal ordinate is thirdly got saturation region decrease temperature and pressure (to 0.15MPa), about 110 ± 5 ℃ of the minimum points under the saturated-vapor state; The 4th horizontal ordinate is taken the high ambient temperature of focus+about 10 ℃.The straight line of determining according to each zone is given different temperature fall time m and cooling value t then.Instrument elder generation detected temperatures judges that in which district, according to the flow process of scheme one tiny flow quantity judgement, detection has or not tiny flow quantity then.The setting minimum temperature value C of this moment be about (environment temperature+10) ℃, when the temperature that detects is worth near this, stops the tiny flow quantity detection.
Software section: (0--does not have small amount of flow measuring will to demarcate the Scheme Choice position; 1--scheme one; 2--scheme two; 3--scheme three), setting cooling value t, setting temperature fall time m and setting minimum temperature value C assignment are set in the computer storage unit.
Hardware components: after requiring point for measuring temperature must be installed in total inlet valve.Flow sensor, pressure, temperature signal are inserted the flowmeter that one-chip computer constitutes.
The invention has the beneficial effects as follows, can detect with having or not tiny flow quantity in the hot system, can guarantee to use hot safety, can reach energy saving purposes by the means of management again, technological transformation is convenient, implements simple.
Four, description of drawings
Fig. 1 is an instrumentation mounting structure synoptic diagram of the present invention
Fig. 2 is the instrumentation mounting structure synoptic diagram that the present invention has gas-distributing cylinder
Fig. 3 is an instrument system structural representation of the present invention
Fig. 4 is the intelligent flow table block scheme with tiny flow quantity measuring ability
Fig. 5 is 2 calibration maps of field case steam time-temperature curve
Fig. 6 is 3 calibration maps of field case steam time-temperature curve
Fig. 7 is 4 calibration maps of field case steam time-temperature curve
Fig. 8 is 2 calibration software design flow diagram of computing machine
Fig. 9 is 3 calibration software design flow diagram of computing machine
Figure 10 is 4 calibration software design flow diagram of computing machine
Among the figure: 1. live steam piping, 2. branch trachea road, 3. total inlet valve, 4. flow sensor, 5. pressure tap, 6. tiny flow quantity point for measuring temperature, 7. manifold valve 1, and 8. manifold valve 2,9. gas-distributing cylinder, 10. drain valve, 11. gas-distributing cylinder supports, 12. isolation valves, 13. flow-compensated points for measuring temperature.
Five, embodiment
The present invention is further described below in conjunction with drawings and Examples.
In Fig. 1, detect tiny flow quantity and be installed on the pipeline with point for measuring temperature (6), flow sensor (4) and pressure tap (5) are pressed code requirement and are installed, and flowmeter compensation temperature measurement signal can be shared with the tiny flow quantity temperature measurement signal.For the reliability that guarantees to detect, this mounting means the nominal time-during temperature curve, preferably manifold valve 7 and manifold valve 8 are closed.
In Fig. 2, detect tiny flow quantity point for measuring temperature (6) and be installed on the gas-distributing cylinder, flow sensor (4) and pressure tap (5), flow-compensated point for measuring temperature (13) are installed on the pipeline by code requirement.For the reliability that guarantees to detect, this mounting means the nominal time-during temperature curve, preferably manifold valve 7 and manifold valve 8 are closed.
Fig. 3 is an instrument system structural representation of the present invention, the electric signal of above detection tiny flow quantity point for measuring temperature (6), flow sensor (4), pressure tap (5) and flow-compensated point for measuring temperature (13) conversion is sent into the instrument with computer function, and (0--does not have small amount of flow measuring to set demarcation Scheme Choice position J3; 1--scheme one; 2--scheme two; 3--scheme three), definite 2 of will set demarcate still multi-point calibration value, select the computer software design flow process.If design and installation equipment does not have gas-distributing cylinder, then there is not tiny flow quantity point for measuring temperature (6), tiny flow quantity signal point for measuring temperature is directly used flow-compensated point for measuring temperature (13) signal among Fig. 1 so.
Scheme Selection requires:
Scheme one: to being in the pipe network end, the user that steam parameter is in the saturation region all the time and tiny flow quantity is generally controlled, can select the time-temperature curve of 2 demarcation, the maximum temperature of taking focus is as 1 a (h1, c1), after getting decrease temperature and pressure (to 0.15MPa), about 110 ± 5 ℃ of minimum points under the saturated-vapor state as second d (h2, c2).And demarcate a position J3=1, cooling value t, temperature fall time m and minimum temperature value C with 2 and be set in the instrument;
Scheme two: the user that steam parameter is changed through be everlasting overheated zone and saturation region and to the user of the general control of tiny flow quantity, can select the time-temperature curve of 3 demarcation, the maximum temperature of taking vapour point is as first horizontal ordinate, promptly a (h1, c1); After getting saturation region decrease temperature and pressure (to 0.15MPa), 110 ± 5 ℃ of left and right sides c2 of the minimum point under the saturated-vapor state are as second horizontal ordinate, promptly b (h2, c2); The high ambient temperature d4 that takes focus is as horizontal ordinate thirdly, promptly d (h3, c3).And with 3 demarcate position J3=2, steam lower limit temperature c2, high ambient temperature c3, steam dome temperature fall time m2, hydrothermal area's temperature fall time m3, steam dome cooling value t2, hydrothermal area's cooling value t3 is set in the instrument;
Scheme three: to the user that the user that is in the overheated zone and tiny flow quantity require the comparison strictness, can select the time-temperature curve of 4 demarcation, the maximum temperature of taking focus is as first horizontal ordinate, promptly a (h1, c1); Saturation temperature c2 under the heat-obtaining net top pressure is as second horizontal ordinate, promptly b (h2, c2); Get thirdly horizontal ordinate of 110 ± 5 ℃ of left and right sides c3 conducts of saturation region decrease temperature and pressure (to 0.15MPa) back saturated-vapor state minimum point down, promptly c (h3, c3); The high ambient temperature d4 that takes focus is as the 4th horizontal ordinate, promptly d (h4, c4).And with 4 demarcate saturation temperature c2, saturation region lower limit temperature c3 under position J3=3, the heat supply network top pressure, high ambient temperature c4, overheated zone temperature fall time m1, saturation region temperature fall time m2, hydrothermal area's temperature fall time m3, overheated zone cooling value t1, saturation region cooling value t2, hydrothermal area's cooling value t3 is set in the instrument.
Instrument is worked automatically according to the corresponding software of software flow pattern design, and judgement is had or not result's output of tiny flow quantity.
Fig. 4 is the intelligent flow table block scheme with tiny flow quantity measuring ability, when instantaneous delivery F＞0, known flow accumulation function and other development functions is arranged, temperature signal use traffic compensation point for measuring temperature signal; When instantaneous delivery F=0, carry out tiny flow quantity and detect, its temperature signal is: the tiny flow quantity point for measuring temperature is on pipeline, and by one-chip computer control, tiny flow quantity temperature measurement signal and flow-compensated temperature signal use the same signal of same passage; The tiny flow quantity point for measuring temperature is on gas-distributing cylinder, and by one-chip computer control, the temperature signal of this moment is the tiny flow quantity point for measuring temperature signal on the gas-distributing cylinder.
Fig. 5 is 2 calibration maps of field case steam time-temperature curve: after closing total inlet valve fully, the maximum temperature of taking focus on time-temperature variation curve is as 1 a (h1, c1), after getting decrease temperature and pressure (to 0.15MPa), about 110 ± 5 ℃ of minimum points under the saturated-vapor state are as second d (h2, c2), connect 2 straight slope:
K=| (c1-c2)/(h1-h2) | formula 4
According to the requirement of CONTROL PROCESS, can have two groups of temperature fall times and cooling setting value to provide:
Know by formula 2, formula 4,, set temperature fall time so when setting t=1 ℃ of cooling value:
m＝(1.0～2.0)*l/k
=(1.0～2.0) * | (h1-h2)/(c1-c2) | (unit: minute)
Know by formula 3, formula 4,, set the cooling value so when setting temperature fall time m=1 minute:
t＝(1.0～1/2)*k
=(1.0～1/2) * | (c1-c2)/(h1-h2) | (unit: ℃)
Lowest set temperature value C=110 ± about 5 ℃.
Fig. 6 is 3 calibration maps of field case steam time-temperature curve: after closing total inlet valve fully, on time-temperature variation curve, the maximum temperature of taking vapour point is as first horizontal ordinate, promptly a (h1, c1); After getting saturation region decrease temperature and pressure (to 0.15MPa), 110 ± 5 ℃ of left and right sides c2 of the minimum point under the saturated-vapor state are as second horizontal ordinate, promptly b (h2, c2); The high ambient temperature d4 that takes focus is as horizontal ordinate thirdly, promptly d (h3, c3).
The slope of steam dome straight line ab is: k1=| (c1-c2)/(h1-h2) |, according to the requirement of CONTROL PROCESS, can have two groups of temperature fall times and cooling value to provide:
Know by formula 2, formula 4,, set temperature fall time so when setting t1=1 ℃ of cooling value:
m1＝(1.0～2.0)*l/k1
=(1.0～2.0) * | (h1-h2)/(c1-c2) | (unit: minute)
Know by formula 3, formula 4,, set the cooling value so when setting temperature fall time m1=1 minute:
t1＝(1.0～1/2)*k1
=(1.0～1/2) * (c1-c2)/(h1-h2) | (unit: ℃)
The slope of hydrothermal area's straight line bd is: k2=| (c2-c3)/(h2-h3) |, according to the requirement of CONTROL PROCESS, can have two groups of temperature fall times and cooling setting value to provide:
Know by formula 2, formula 4,, set temperature fall time so when setting t2=1 ℃ of cooling value:
m2＝(1.0～2.0)*1/k2
=(1.0～2.0) * | (h2-h3)/(c2-c3) | (unit: minute)
Know by formula 3, formula 4,, set the cooling value so when setting temperature fall time m2=1 minute:
t2＝(1.0～1/2)*k2
=(1.0～1/2) * | (c2-c3)/(h2-h3) | (unit: ℃)
About lowest set temperature C=environment temperature+10 ℃.
Fig. 7 is 3 calibration maps of field case steam time-temperature curve: after closing total inlet valve fully, on time-temperature variation curve, the maximum temperature of taking focus is as first horizontal ordinate, promptly a (h1, c1); Saturation temperature c2 under the heat-obtaining net top pressure is as second horizontal ordinate, promptly b (h2, c2); Get thirdly horizontal ordinate of 110 ± 5 ℃ of left and right sides c3 conducts of saturation region decrease temperature and pressure (to 0.15MPa) back saturated-vapor state minimum point down, promptly c (h3, c3); The high ambient temperature d4 that takes focus is as the 4th horizontal ordinate, promptly d (h4, c4).
The slope of overheated zone straight line ab is: k1=| (c1-c2)/(h1-h2) |, according to the requirement of CONTROL PROCESS, can have two groups of temperature fall times and cooling setting value to provide:
Know by formula 2, formula 4,, set temperature fall time so when setting t1=1 ℃ of cooling value:
m1＝(1.0～2.0)*l/k1
=(1.0～2.0) * | (h1-h2)/(c1-c2) | (unit: minute)
Know by formula 3, formula 4,, set the cooling value so when setting temperature fall time m1=1 minute:
t1＝(1.0～1/2)*k1
=(1.0～1/2) * | (c1-c2)/(h1-h2) | (unit: ℃)
The slope of saturation region straight line bc is: k2=(c2-c3)/(h2-h3) |, according to the requirement of technology controlling and process, can have two groups of temperature fall times and cooling setting value to provide:
Know by formula 2, formula 4,, set temperature fall time so when setting t2=1 ℃ of cooling value:
m2＝(1.0～2.0)*l/k2
=(1.0～2.0) * | (h2-h3)/(c2-c3) | (unit: minute)
Know by formula 3, formula 4,, set the cooling value so when setting temperature fall time m2=1 minute:
t2＝(1.0～1/2)*k2
=(1.0～1/2) * | (c2-c3)/(h2-h3) | (unit: ℃)
The slope of hydrothermal area's straight line cd is: k3=| (c3-c4)/(h3-h4) |, according to the requirement of technology controlling and process, can have two groups of temperature fall times and cooling setting value to provide:
Know by formula 2, formula 4,, set temperature fall time so when setting t3=1 ℃ of cooling value:
m3＝(1.0～2.0)*1/k3
=(1.0～2.0) * | (h3-h4)/(c3-c4) | (unit: minute)
Know by formula 3, formula 4,, set the cooling value so when setting temperature fall time m3=1 minute:
t3＝(1.0～1/2)*k3
=(1.0～1/2) * | (c3-c4)/(h3-h4) | (unit: ℃)
About lowest set temperature C=environment temperature+10 ℃.
Fig. 8 is 2 calibration software design flow diagram of computing machine, and demarcation scheme that beginning will choose earlier and the good data assignment of calculating are set to instrument: demarcate a position J3=1, cooling value t, temperature fall time m and minimum temperature value C at 2.Detect tiny flow quantity point for measuring temperature (6) temperature then, deposit among the storer A stand-by as initial temperature C0.Judge that whether instantaneous delivery F is greater than zero, if F＞0, then flowmeter shows integrating in accordance with regulations, if instantaneous delivery F=0 then compares thermometric value among the storer A and minimum temperature value C, if A＜C, then this moment, flowmeter was not considered tiny flow quantity, and instrument shows integrating by null value, if A 〉=C, timer T picks up counting so, in case timer T equals temperature fall time m, and flowmeter is in time m, and instantaneous delivery F shows zero (instantaneous delivery F＞0 always, press normal discharge and show integrating), then detect the temperature C1 value of tiny flow quantity point for measuring temperature (6), judge A-C1 〉=cooling value t, if, then there is not tiny flow quantity, instrument shows integrating in accordance with regulations, if A-C1＜cooling value t has illustrated tiny flow quantity, then instrument is when showing integrating in accordance with regulations, and the output tiny flow quantity shows, control, alerting signal.
Fig. 9 is 3 calibration software design flow diagram of computing machine, the beginning demarcation scheme that will choose earlier and calculate good data assignment and set to instrument: demarcate a position J3=2, high ambient temperature c3, steam lower limit temperature c2, steam dome temperature fall time m2, steam dome cooling value t2, hydrothermal area's temperature fall time m3, hydrothermal area's cooling value t3 at 3.Detect tiny flow quantity point for measuring temperature (6) temperature then, deposit among the storer A stand-by as initial temperature C0.Whether judge instantaneous delivery F greater than zero, if F＞0, then flowmeter shows integrating in accordance with regulations, if instantaneous delivery F=0 then compares thermometric value among the storer A and minimum ambient temperature value C3, if A＜C3, then this moment, flowmeter was not considered tiny flow quantity, instrument shows integrating by null value, if A 〉=C3 then compares storer A and steam lower-limit temperature value C2, if A＞C2, then Ci Shi steam parameter is inserted storer D with m2 earlier in the steam dome, and t2 is inserted storer E; If A≤C2 then inserts m3 storer D, t3 is inserted storer E the hydrothermal area this moment.Timer T picks up counting then, in case timer T equals the temperature fall time parameter among the storer D, and flowmeter at this moment between in, instantaneous delivery F shows zero (instantaneous delivery F＞0 always, press normal discharge and show integrating), then detect the temperature C1 value of tiny flow quantity point for measuring temperature (6), judge A-C1 〉=E, if, then there is not tiny flow quantity, instrument shows integrating in accordance with regulations, if A-C1＜E, tiny flow quantity has been described, then instrument is exported tiny flow quantity demonstration, control, alerting signal when showing integrating in accordance with regulations.
Figure 10 is 4 calibration software design flow diagram of computing machine, the beginning demarcation scheme that will choose earlier and calculate good data assignment and set to instrument: 4 saturation temperature c2, saturation region lower limit temperature c3, overheated zone temperature fall time m1, overheated zone cooling value t1, saturation region temperature fall time m2, saturation region cooling value t2, hydrothermal area's temperature fall time m3, hydrothermal area's cooling value t3 that demarcate under J3=3, high ambient temperature c4, the heat supply network top pressure.Detect tiny flow quantity point for measuring temperature (6) temperature then, deposit among the storer A stand-by as initial temperature C0.Whether judge instantaneous delivery F greater than zero, if F＞0, then flowmeter shows integrating in accordance with regulations, if instantaneous delivery F=0 then compares thermometric value among the storer A and minimum ambient temperature value C4, if A＜C4, then this moment, flowmeter was not considered tiny flow quantity, instrument shows integrating by null value, if A 〉=C4 then compares storer A and steam lower-limit temperature value C2, if A＞C2, then Ci Shi steam parameter is inserted storer D with m1 earlier in the overheated zone, and t1 is inserted storer E; Otherwise A≤C2, A and saturation region lower limit temperature c3 compare so, if A＞C3, then Ci Shi steam parameter is inserted storer D with m2 earlier in the saturation region, and t2 is inserted storer E; If A≤C3 then inserts m3 storer D, t3 is inserted storer E the hydrothermal area this moment.Timer T picks up counting then, in case timer T equals the temperature fall time parameter among the storer D, and flowmeter at this moment between in, instantaneous delivery F shows zero (instantaneous delivery F＞0 always, press normal discharge and show integrating), then detect the temperature C1 value of tiny flow quantity point for measuring temperature (6), judge A-C1 〉=E, if, then there is not tiny flow quantity, instrument shows integrating in accordance with regulations, if A-C1＜E, tiny flow quantity has been described, instrument is exported tiny flow quantity demonstration, control, alerting signal when showing integrating in accordance with regulations.
Claims (8)
1. intelligent detection method of steam tiny flow quantity, it is characterized in that: at first when cutting off the vapour source, according to time-temperature curve and the CONTROL PROCESS requirement in pipeline or the gas-distributing cylinder behind the total inlet valve that detects and draw, demarcate and calculate, (0--does not have small amount of flow measuring to determine to be set in demarcation Scheme Choice position in the instrument; 1--scheme one; 2--scheme two; 3--scheme three), cooling value t, set temperature fall time m and set and do not consider the minimum temperature value C of tiny flow quantity, and detect tiny flow quantity according to this, when instantaneous delivery F＞0, instrument normally shows integrating with the function of flowmeter.Concrete grammar is:
(1) in pipeline after desire is measured total inlet valve of tiny flow quantity or the gas-distributing cylinder point for measuring temperature is installed,
(2) when the tiny flow quantity point for measuring temperature reaches with hot maximum temperature, close total inlet valve fully, detect and make the point for measuring temperature temperature-time curve figure of place.
(3) temperature-time curve of step (2) is selected the demarcation scheme, and temperature fall time m and cooling value t and minimum temperature C value between definite straight slope and per 2.
(4) with demarcation Scheme Choice position and temperature fall time m and the cooling value t and the minimum temperature C data input instrument of step (3), store stand-by.
(5) the current measurement temperature data of instrument deposits storer A in, and with minimum temperature C value relatively, when A＜C value, flowmeter normally shows integrating, otherwise measures the zone at temperature place according to this moment, temperature fall time m and cooling value t that selection has been stored, detect tiny flow quantity, and in temperature fall time m monitoring instantaneous delivery F, when F＞0, stop tiny flow quantity and detect, flowmeter normally shows integrating in accordance with regulations.
(6) the result output that will detect tiny flow quantity show, flow control, warning etc.
2. intelligent detection method of steam tiny flow quantity according to claim 1, it is characterized in that: temperature-time curve is demarcated scheme one: to being in the pipe network end, all the time the user who is in the saturation region and tiny flow quantity is generally controlled, select 2 demarcation, the maximum temperature of taking focus as 1 a (h1, c1), get decrease temperature and pressure (to 0.15MPa) after, about 110 ± 5 ℃ of minimum points under the saturated-vapor state as second d (h2, c2).
3. intelligent detection method of steam tiny flow quantity according to claim 1, it is characterized in that: temperature-time curve is demarcated scheme two: the user that steam parameter is changed through be everlasting overheated zone and saturation region and to the user of the general control of tiny flow quantity, select 3 demarcation to take the maximum temperature of vapour point as first horizontal ordinate, be a (h1, c1); After getting saturation region decrease temperature and pressure (to 0.15MPa), 110 ± 5 ℃ of left and right sides c2 of the minimum point under the saturated-vapor state are as second horizontal ordinate, promptly b (h2, c2); The high ambient temperature d4 that takes focus is as horizontal ordinate thirdly, promptly d (h3, c3).
4. intelligent detection method of steam tiny flow quantity according to claim 1, it is characterized in that: temperature-time curve is demarcated scheme three: to being in the relatively stricter user of overheated zone and tiny flow quantity requirement, select 4 demarcation to take the maximum temperature of focus as first horizontal ordinate, be a (h1, c1); Saturation temperature c2 under the heat-obtaining net top pressure is as second horizontal ordinate, promptly b (h2, c2); Get thirdly horizontal ordinate of 110 ± 5 ℃ of left and right sides c3 conducts of saturation region decrease temperature and pressure (to 0.15MPa) back saturated-vapor state minimum point down, promptly c (h3, c3); The high ambient temperature d4 that takes focus is as the 4th horizontal ordinate, promptly d (h4, c4).
5. intelligent detection method of steam tiny flow quantity according to claim 1 is characterized in that: temperature fall time m and cooling value t are calculated by following mathematical expression:
k＝|(c1-c2)/(h1-h2)|
m＝(1.0～2.0)*1/k
t＝(1.0～1/2)*k
And when determining to be set in t=1 ℃ of cooling value in the instrument with this needed at least setting temperature fall time m or set temperature fall time m=1 minute maximum setting cooling value t
6. intelligent detection method of steam tiny flow quantity according to claim 1, it is characterized in that: on time-temperature variation curve, in the calibration point that the certain hour zone is got, any of horizontal ordinate minimum is as the reference point of minimum temperature C value, and temperature is lower than the C value and does not consider tiny flow quantity.
7. intelligent detection method of steam tiny flow quantity according to claim 1 is characterized in that: after point for measuring temperature is installed in total inlet valve.
8. intelligent detection method of steam tiny flow quantity according to claim 1 is characterized in that: during instantaneous delivery F=0, carry out tiny flow quantity and detect, and carry out flow demonstration, control, warning.Instantaneous delivery F＞0 shows integrating by known normal discharge.
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| CNA2007101123761A CN101324457A (en) | 2007-06-12 | 2007-06-12 | Intelligent detection method of steam tiny flow quantity |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104501894A (en) * | 2014-12-19 | 2015-04-08 | 重庆拓展自动化仪表有限公司 | Accurate steam flow metering compensating method |
| CN107300397A (en) * | 2016-04-16 | 2017-10-27 | 上海华电闵行能源有限公司 | Intelligent flow calculus instrument |
| CN114046835A (en) * | 2021-09-29 | 2022-02-15 | 华能苏州热电有限责任公司 | Steam flow metering method and device based on flow integrating instrument |
-
2007
- 2007-06-12 CN CNA2007101123761A patent/CN101324457A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104501894A (en) * | 2014-12-19 | 2015-04-08 | 重庆拓展自动化仪表有限公司 | Accurate steam flow metering compensating method |
| CN107300397A (en) * | 2016-04-16 | 2017-10-27 | 上海华电闵行能源有限公司 | Intelligent flow calculus instrument |
| CN114046835A (en) * | 2021-09-29 | 2022-02-15 | 华能苏州热电有限责任公司 | Steam flow metering method and device based on flow integrating instrument |
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