CN109101460A - A kind of thermal power generation unit operational safety performance evaluation method based on safety allowance - Google Patents
A kind of thermal power generation unit operational safety performance evaluation method based on safety allowance Download PDFInfo
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- CN109101460A CN109101460A CN201810644676.2A CN201810644676A CN109101460A CN 109101460 A CN109101460 A CN 109101460A CN 201810644676 A CN201810644676 A CN 201810644676A CN 109101460 A CN109101460 A CN 109101460A
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Abstract
The thermal power generation unit operational safety performance evaluation method based on safety allowance that the invention discloses a kind of.Present invention determination first can reflect the parameter of unit operational safety performance；Then the calculation method of its safety allowance is determined according to the characteristic of each parameter；The safety allowance of each parameter is calculated further according to setting formula；Finally calculate total safety allowance of unit.The comprehensive objective appraisal that may be implemented to thermal power generation unit operational safety performance is ranked up to unit with this.
Description
Technical field
The present invention relates to thermal power generating technology field, specifically a kind of thermal power generation unit based on safety allowance runs peace
Full method of evaluating performance.
Background technique
With the needs of China's power industry and national economy sustainable development, extra-high voltage grid is gradually built up, wind
The clean energy resourcies such as electricity, solar energy, nuclear power access on a large scale, and thermoelectricity installed capacity is seriously superfluous, peak load regulation network scarce capacity, thermoelectricity
Unit, which participates in the depth of peak regulation and length, will all greatly increase.Prolonged underrun, quickly frequent high underload is cut
It changes, all brings difficulty to the safe operation of unit.Therefore how the operational safety performance of unit is monitored, assessed and arranged
Sequence needs a set of scientific and rational method.
The evaluation of usual thermal power unit operation safety, is based purely on the degree of closeness of each parameter and alarming value, closer to report
Alert value is then more dangerous.This method is only applicable to the safety evaluatio of single parameter, for multiple parameters, then cannot measure comprehensively
Change the security situation of reaction unit.For example, a unit has multiple parameters distance alarm value, all there are also very big allowances, but have one
Parameter is very close to alarming value, and all parameters of another unit are all very close to alarming value, conventional method in this case
It is difficult to make the safety of the two and objectively evaluates.
Summary of the invention
In view of the above-mentioned problems, each key parameter can correspond to one present invention introduces the concept of safety allowance dimension
Safety allowance value can also further obtain the total allowance value of unit, and being ranked up with this to unit, which may be implemented, sends out firepower
Comprehensive objective appraisal of motor group operational safety performance.
The technical scheme is that a kind of thermal power generation unit operational safety performance evaluation side based on safety allowance
Method, characterized in that the following steps are included:
1) determination can reflect the parameter of unit operational safety performance；
2) calculation method of its safety allowance is determined according to the characteristic of each parameter；
3) safety allowance of each parameter is calculated according to setting formula；
4) total safety allowance of unit is calculated.
Preferably, the parameter that can reflect unit operational safety performance that step 1) determines are as follows: choose overheating steam temperature, again hot vapour
Temperature, superheated steam pressure, reheated steam pressure, SCR inlet smoke temperature and combustion chamber draft totally 6 parameters as security performance evaluation
6 dimensions.
Wherein step 2) determines the calculation method of its safety allowance according to the characteristic of each parameter are as follows:
2-1) overheating steam temperature
When (- 10 DEG C of alarming value)≤overheating steam temperature≤alarming value, this dimension safety allowance A1:
When overheating steam temperature < (- 10 DEG C of alarming value), A1=1；
When overheating steam temperature > alarming value, A1=0；
2-2) reheat steam temperature: calculation method is identical as overheating steam temperature；
2-3) superheated steam pressure
When (alarming value -0.5MPa)≤superheated steam pressure≤alarming value, this dimension safety allowance A3:
When superheated steam pressure < (alarming value -0.5MPa), A3=1；
When superheated steam pressure > alarming value, A3=0.
2-4) reheated steam pressure
When (alarming value -0.2MPa)≤reheated steam pressure≤alarming value, this dimension safety allowance A4:
When reheated steam pressure < (alarming value -0.2MPa), A4=1；
When reheated steam pressure > alarming value, A4=0；
2-5) SCR inlet smoke temperature
When (- 5 DEG C of high temperature alarm value)≤flue-gas temperature≤high temperature alarm value, this dimension safety allowance A5:
Low-temperature warning value≤flue-gas temperature≤(at+5 DEG C of low-temperature warning value),
When (+5 DEG C of low-temperature warning value) < flue-gas temperature < (- 5 DEG C of high temperature alarm value), A5=1；
When flue-gas temperature < low-temperature warning value, A5=0；
When flue-gas temperature > high temperature alarm value, A5=0；
2-6) combustion chamber draft
With the standard deviation sigma of negative pressure fluctuation in 2 minutesjFor judgment basis,
Work as σjWhen < 100, this dimension safety allowance A6:
Work as σjWhen >=100, A6=0.
Wherein, above-mentioned standard deviation calculation method are as follows: calculate combustion chamber draft when safety allowance when, calculate the moment forward
Take 2 minutes combustion chamber draft values, every 1 second numerical value, totally 120 numbers, then standard deviation formula is as follows.
In formula:
Pi--- (120-i) before the second unit combustion chamber draft value；
PIt is average--- the average value of the unit combustion chamber draft in 2 minutes.
The step 3) calculates total safety allowance of unit are as follows: squared to the quadratic sum of the safety allowance of each dimension
Root, obtains the total safety allowance of unit and sequence, and total safety allowance A is each dimension allowance quadratic sum AiSquare root.
Wherein, overheating steam temperature: boiler finishing superheater outlet steam temperature (Stream temperature).
Wherein, superheated steam pressure: boiler finishing superheater outlet vapor pressure.
Wherein, reheat steam temperature: boiler final reheater outlet steam temperature (reheat steam temperature).
Wherein, reheated steam pressure: boiler final reheater outlet vapor pressure.
Wherein, SCR inlet smoke temperature: boiler SCR denitration device entrance flue gas temperature.
The principle of the present invention is as shown in Fig. 2, by taking three overheating steam temperature, SCR inlet smoke temperature and reheat steam temperature dimensions as an example, and three
The safety allowance of a dimension is coordinate of total safety allowance in three dimensions, the value of total safety allowance be the point to origin away from
From square root sum square of that is, three dimension safety allowances.Origin is that each safety index is in alarming value (critical shape
State) operating states of the units coordinate description.Safety allowance index is the measurement of the distance of virtual condition and critical state.
The beneficial effects of the present invention are: the present invention selects the parameter of reflection unit operational safety performance, each key first
Parameter corresponds to a safety allowance value, and further obtains the total allowance value of unit, and being ranked up with this to unit may be implemented
Comprehensive objective appraisal to thermal power generation unit operational safety performance has thermal power generation unit safety in operation important
Meaning.
Detailed description of the invention
Fig. 1 is the flow chart of evaluation method of the invention；
Fig. 2 is total safety allowance physical significance schematic diagram.
Specific embodiment
Below with reference to application example, specific embodiments of the present invention will be described in further detail.
By taking tri- units of A, B, C as an example, using method of the invention, three unit operational safety performances of a certain moment are obtained
Sequence, process is as shown in Figure 1, shown in specific step is as follows:
1, it is negative that overheating steam temperature, reheat steam temperature, superheated steam pressure, reheated steam pressure, SCR inlet smoke temperature and burner hearth are chosen
Press 6 dimensions of totally 6 parameters as security performance evaluation；Then the alarm of the above-mentioned each dimension of tri- units of A, B, C is recorded
Value and real value, the moment, each supplemental characteristic was as shown in table 1；
2, the calculation method of the safety allowance determined according to the characteristic of each parameter, parameter enter proximal to the danger area of alarming value
Start to calculate safety allowance behind domain, safety allowance is 1 except danger zone, and the calculation formula of specific each dimension is as follows:
(1) overheating steam temperature
When (- 10 DEG C of alarming value)≤overheating steam temperature≤alarming value, this dimension safety allowance A1:
When overheating steam temperature < (- 10 DEG C of alarming value), A1=1；
When overheating steam temperature > alarming value, A1=0.
(2) reheat steam temperature: calculation method is identical as overheating steam temperature；
(3) superheated steam pressure
When (alarming value -0.5MPa)≤superheated steam pressure≤alarming value, this dimension safety allowance A3:
When superheated steam pressure < (alarming value -0.5MPa), A3=1；
When superheated steam pressure > alarming value, A3=0.
(4) reheated steam pressure
When (alarming value -0.2MPa)≤reheated steam pressure≤alarming value, this dimension safety allowance A4:
When reheated steam pressure < (alarming value -0.2MPa), A4=1；
When reheated steam pressure > alarming value, A4=0.
(5) SCR inlet smoke temperature
When (- 5 DEG C of high temperature alarm value)≤flue-gas temperature≤high temperature alarm value, this dimension safety allowance A5:
When low-temperature warning value≤flue-gas temperature≤+ 5 DEG C of low-temperature warning value,
When+5 DEG C of low-temperature warning value < flue-gas temperature < -5 DEG C of high temperature alarm value, A5=1；
When flue-gas temperature < low-temperature warning value, A5=0；
When flue-gas temperature > high temperature alarm value, A5=0；
(6) combustion chamber draft
With the standard deviation sigma of negative pressure fluctuation in 2 minutesjFor judgment basis,
Work as σjWhen < 100, this dimension safety allowance A6:
Work as σjWhen >=100, A6=0.
When safety allowance when calculating combustion chamber draft, 2 minutes combustion chamber draft values are taken forward calculating the moment, every 1 second
One numerical value, totally 120 numbers, then standard deviation formula is as follows.
In formula:
Pi--- (120-i) before the second unit combustion chamber draft value；
PIt is average--- the average value of the unit combustion chamber draft in 2 minutes.
3, to the quadratic sum extraction of square root of the safety allowance of each dimension, the total safety allowance of unit and sequence are obtained, always
Safety allowance A is each dimension allowance square root sum square,
It is calculated according to the moment each supplemental characteristic in above-mentioned calculation formula and table 1, obtains A unit, B unit and C
The safety allowance of three each dimensions of unit of unit, then calculates total safety allowance.The peace obtained according to safety allowance numerical value
Full performance is by being ordered as A, B, C to difference well.
Total safety allowance computational chart of 1 three units of table
Claims (5)
1. a kind of thermal power generation unit operational safety performance evaluation method based on safety allowance, characterized in that including following step
It is rapid:
1) determination can reflect the parameter of unit operational safety performance；
2) calculation method of its safety allowance is determined according to the characteristic of each parameter；
3) safety allowance of each parameter is calculated according to setting formula；
4) total safety allowance of unit is calculated.
2. a kind of thermal power generation unit operational safety performance evaluation method based on safety allowance as described in claim 1,
It is characterized in, the parameter that can reflect unit operational safety performance that the step 1) determines are as follows: overheating steam temperature, reheat steam temperature, overheat
Steam pressure, reheated steam pressure, SCR inlet smoke temperature and combustion chamber draft.
3. a kind of thermal power generation unit operational safety performance evaluation method based on safety allowance as claimed in claim 2,
It is characterized in,
The step 2) determines the calculation method of its safety allowance according to the characteristic of each parameter are as follows:
2-1) overheating steam temperature
When (- 10 DEG C of alarming value)≤overheating steam temperature≤alarming value, this dimension safety allowance A1:
When overheating steam temperature < (- 10 DEG C of alarming value), A1=1；
When overheating steam temperature > alarming value, A1=0；
2-2) reheat steam temperature: calculation method is identical as overheating steam temperature；
2-3) superheated steam pressure
When (alarming value -0.5MPa)≤superheated steam pressure≤alarming value, this dimension safety allowance A3:
When superheated steam pressure < (alarming value -0.5MPa), A3=1；
When superheated steam pressure > alarming value, A3=0；
2-4) reheated steam pressure
When (alarming value -0.2MPa)≤reheated steam pressure≤alarming value, this dimension safety allowance A4:
When reheated steam pressure < alarming value -0.2MPa, A4=1；
When reheated steam pressure > alarming value, A4=0；
2-5) SCR inlet smoke temperature
When (- 5 DEG C of high temperature alarm value)≤flue-gas temperature≤high temperature alarm value, this dimension safety allowance A5:
Low-temperature warning value≤flue-gas temperature≤(at+5 DEG C of low-temperature warning value), this dimension safety allowance A5:
When (+5 DEG C of low-temperature warning value) < flue-gas temperature < (- 5 DEG C of high temperature alarm value), A5=1；
When flue-gas temperature < low-temperature warning value, A5=0；
When flue-gas temperature > high temperature alarm value, A5=0；
2-6) combustion chamber draft
With the standard deviation sigma of negative pressure fluctuation in 2 minutesjFor judgment basis,
Work as σjWhen < 100, this dimension safety allowance A6:
Work as σjWhen >=100, A6=0.
4. a kind of thermal power generation unit operational safety performance evaluation method based on safety allowance as claimed in claim 3,
Be characterized in, the step 2-6) standard deviation calculation method are as follows: calculate combustion chamber draft when safety allowance when, calculate the moment it is past
Before take 2 minutes combustion chamber draft values, every 1 second numerical value, totally 120 numbers, then standard deviation formula is as follows:
In formula:
Pi--- (120-i) before the second unit combustion chamber draft value；
PIt is average--- the average value of the unit combustion chamber draft in 2 minutes.
5. a kind of thermal power generation unit operational safety performance based on safety allowance as described in any one of claim 1-4
Evaluation method, characterized in that the step 3) calculates total safety allowance of unit are as follows: total safety allowance A is that each dimension allowance is flat
Square root sum square,
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