CN107355768B - The analysis method and device that spray desuperheating influences boiler steam temperature - Google Patents
The analysis method and device that spray desuperheating influences boiler steam temperature Download PDFInfo
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- CN107355768B CN107355768B CN201710621948.2A CN201710621948A CN107355768B CN 107355768 B CN107355768 B CN 107355768B CN 201710621948 A CN201710621948 A CN 201710621948A CN 107355768 B CN107355768 B CN 107355768B
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- 239000007921 spray Substances 0.000 title claims abstract description 33
- 238000004458 analytical method Methods 0.000 title claims abstract description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 47
- 238000013461 design Methods 0.000 claims abstract description 12
- 239000003517 fume Substances 0.000 abstract description 8
- 238000000034 method Methods 0.000 abstract description 7
- 238000011002 quantification Methods 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 6
- 238000011156 evaluation Methods 0.000 description 4
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- 239000003546 flue gas Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 235000019504 cigarettes Nutrition 0.000 description 1
- 238000005206 flow analysis Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000003643 water by type Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B35/00—Control systems for steam boilers
- F22B35/18—Applications of computers to steam boiler control
Abstract
The present invention provides the analysis method and device that a kind of spray desuperheating influences boiler steam temperature.This method comprises: creation temperature deviation model and total deviation model；Vapor (steam) temperature after vapor (steam) temperature, every level-one desuperheating water desuperheat and each heater outlet vapor (steam) temperature conversion factor before inputting every level-one desuperheating water desuperheat obtain the departure of heater outlet vapor (steam) temperature into temperature deviation model；The departure of top heater outlet steam temperature, top heater outlet steam temperature design value and every grade of heater outlet vapor (steam) temperature is inputted into total deviation model, obtains the total deviation amount of top heater outlet steam temperature.The deviation that the present invention realizes vapor (steam) temperature calculates, and has rated fume side steam temperature with a unified index quantification and adjusts influence of the operation to unit performance driving economy.
Description
Technical field
The present invention relates to boiler steam temperature fields, and in particular, to a kind of spray desuperheating influences boiler steam temperature
Analysis method and device.
Background technique
Fig. 1 is the schematic diagram of spray desuperheating system in the embodiment of the present invention.As shown in Figure 1, spray desuperheating system has knot
Structure is simple, operates convenient reliable advantage, controls vapor (steam) temperature (steam temperature) by spray desuperheating system, is universal in steam boiler
The steam temperature control method of use.It, can be certain since the mixed process of desuperheating water and high-temperature steam increases the entropy of therrmodynamic system
The efficiency of thermodynamic cycle is reduced in degree, it is therefore desirable to the usage amount of desuperheating water in strict control steam boiler.It is steamed by outlet
The temperature change of vapour can learn the increase and decrease of desuperheating water usage amount indirectly, and when carrying out the adjusting operation of fume side steam temperature, need
Consider the variation of outlet steam temperature, but current boiler operatiopn is limited to the action sensitivity of the flow control valve of desuperheating water,
The temperature and preset value of outlet vapor will be a certain deviation (- 10~+5 DEG C), this makes evaluation of flue gas side steam temperature adjust operation pair
There are certain difficulties for the influence of outlet steam temperature.
Summary of the invention
The main purpose of the embodiment of the present invention is that the main purpose for providing a kind of embodiment of the present invention is to provide one kind
The analysis method and device that spray desuperheating influences boiler steam temperature are united with realizing that the deviation of vapor (steam) temperature is calculated with one
One index quantification evaluation of flue gas side steam temperature adjusts influence of the operation to unit performance driving economy.
To achieve the goals above, the embodiment of the present invention provides a kind of analysis that spray desuperheating influences boiler steam temperature
Method, comprising:
Create temperature deviation model and total deviation model；
Vapor (steam) temperature after vapor (steam) temperature, every level-one desuperheating water desuperheat before inputting every level-one desuperheating water desuperheat and it is each plus
Hot device outlet steam temperature conversion factor obtains the departure of heater outlet vapor (steam) temperature into temperature deviation model；
Input top heater outlet steam temperature, top heater outlet steam temperature design value and every grade of heater go out
The departure of mouth vapor (steam) temperature obtains the total deviation amount of top heater outlet steam temperature into total deviation model.
In a kind of wherein embodiment, further includes:
Create temperature conversion factor model；
The pressure of every grade of calorifier inlets steam, the vapor (steam) temperature after every grade of desuperheating water desuperheat are inputted, top heater goes out
The pressure of mouth steam, top heater outlet steam temperature obtain each heater outlet and steam into temperature conversion factor model
Stripping temperature conversion factor.
In a kind of wherein embodiment, temperature deviation model is as follows:
Δtx=kx·(tx-t'x),
(x=1,2 ..., n)
Wherein, Δ txFor the departure of heater outlet vapor (steam) temperature, kxIt is converted for each heater outlet vapor (steam) temperature and is
Number；txFor the vapor (steam) temperature before x grades of desuperheating water desuperheats, t'xFor the vapor (steam) temperature after x grades of desuperheating water desuperheats, n is the grade of desuperheating water
Number.
In a kind of wherein embodiment, temperature conversion factor model is as follows:
Wherein, cp(px,t'x) be x grades of calorifier inlets steam specific heat at constant pressure, cp(pn+1,tn+1) it is top heater
The specific heat at constant pressure of outlet vapor；pxFor the pressure of x grades of calorifier inlets steam, pn+1For the pressure of top heater outlet vapor
Power, tn+1For the temperature of top heater outlet vapor.
In a kind of wherein embodiment, total deviation model is as follows:
Wherein, ∑ Δ tn+1For the total deviation amount of top heater outlet steam temperature, Δ txFor heater outlet steam temperature
The departure of degree, tn+1For top heater outlet steam temperature,For top heater outlet steam temperature design value.
The embodiment of the present invention also provides a kind of analytical equipment that spray desuperheating influences boiler steam temperature, comprising:
Buggy model creating unit, for creating temperature deviation model and total deviation model；
Departure unit, after inputting the vapor (steam) temperature before every level-one desuperheating water desuperheat, every level-one desuperheating water desuperheat
Vapor (steam) temperature and each heater outlet vapor (steam) temperature conversion factor obtain heater outlet steam temperature into temperature deviation model
The departure of degree；
Total deviation amount unit, for inputting top heater outlet steam temperature, top heater outlet steam temperature is set
The departure of evaluation and every grade of heater outlet vapor (steam) temperature obtains top heater outlet steam temperature into total deviation model
Total deviation amount.
In a kind of wherein embodiment, further includes conversion factor model creating unit, is used for:
Create temperature conversion factor model；
The pressure of every grade of calorifier inlets steam, the vapor (steam) temperature after every grade of desuperheating water desuperheat are inputted, top heater goes out
The pressure of mouth steam, top heater outlet steam temperature obtain each heater outlet and steam into temperature conversion factor model
Stripping temperature conversion factor.
In a kind of wherein embodiment, temperature deviation model is as follows:
Δtx=kx·(tx-t'x),
(x=1,2 ..., n)
Wherein, Δ txFor the departure of heater outlet vapor (steam) temperature, kxIt is converted for each heater outlet vapor (steam) temperature and is
Number；txFor the vapor (steam) temperature before x grades of desuperheating water desuperheats, t'xFor the vapor (steam) temperature after x grades of desuperheating water desuperheats, n is the grade of desuperheating water
Number.
In a kind of wherein embodiment, temperature conversion factor model is as follows:
Wherein, cp(px,t'x) be x grades of calorifier inlets steam specific heat at constant pressure, cp(pn+1,tn+1) it is top heater
The specific heat at constant pressure of outlet vapor；pxFor the pressure of x grades of calorifier inlets steam, pn+1For the pressure of top heater outlet vapor
Power, tn+1For the temperature of top heater outlet vapor.
In a kind of wherein embodiment, total deviation model is as follows:
Wherein, ∑ Δ tn+1For the total deviation amount of top heater outlet steam temperature, Δ txFor heater outlet steam temperature
The departure of degree, tn+1For top heater outlet steam temperature,For top heater outlet steam temperature design value.
The analysis method and the available heating of device that the spray desuperheating of the embodiment of the present invention influences boiler steam temperature
The total deviation amount of device outlet steam temperature, the deviation for realizing vapor (steam) temperature are calculated, are had rated with a unified index quantification
Fume side steam temperature adjusts influence of the operation to unit performance driving economy.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, embodiment will be described below
Needed in attached drawing be briefly described, it should be apparent that, the accompanying drawings in the following description is only of the invention some
Embodiment for those of ordinary skill in the art without creative efforts, can also be attached according to these
Figure obtains other attached drawings.
Fig. 1 is the schematic diagram of spray desuperheating system in the embodiment of the present invention；
Fig. 2 is the flow chart for the analysis method that spray desuperheating influences boiler steam temperature in the embodiment of the present invention；
Fig. 3 is the schematic diagram that spray desuperheating influences boiler steam temperature in the embodiment of the present invention；
Fig. 4 is the structural block diagram for the analytical equipment that spray desuperheating influences boiler steam temperature in the embodiment of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
For temperature and preset value in view of current outlet vapor there are deviation, the embodiment of the present invention provides a kind of spray desuperheating pair
The analysis method that boiler steam temperature influences is evaluated with realizing that the deviation of vapor (steam) temperature is calculated with a unified index quantification
Fume side steam temperature adjusts influence of the operation to unit performance driving economy.Below in conjunction with attached drawing, the present invention is described in detail.
Fig. 2 is the flow chart for the analysis method that spray desuperheating influences boiler steam temperature in the embodiment of the present invention.Such as Fig. 2
Shown, attemperation water flow analysis method may include:
Step 101: creation temperature deviation model and total deviation model.
Step 102: the vapor (steam) temperature after vapor (steam) temperature, every level-one desuperheating water desuperheat before inputting every level-one desuperheating water desuperheat
With each heater outlet vapor (steam) temperature conversion factor into temperature deviation model, the deviation of heater outlet vapor (steam) temperature is obtained
Amount；
Step 103: input top heater outlet steam temperature, top heater outlet steam temperature design value and every grade
The departure of heater outlet vapor (steam) temperature obtains the total deviation of top heater outlet steam temperature into total deviation model
Amount.
In embodiment, temperature deviation model is as follows:
Δtx=kx·(tx-t'x), (x=1,2 ..., n),
Wherein, Δ txFor the departure of heater outlet vapor (steam) temperature, unit is DEG C；kxFor each heater outlet steam
Temperature conversion factor；txFor the vapor (steam) temperature before x grades of desuperheating water desuperheats, unit is DEG C；t'xFor the steam after x grades of desuperheating water desuperheats
Temperature, unit are DEG C；N is the series of desuperheating water.
When it is implemented, each heater outlet vapor (steam) temperature conversion factor can be obtained as follows: creation temperature
Spend conversion factor model；The pressure of every grade of calorifier inlets steam, the vapor (steam) temperature after every grade of desuperheating water desuperheat are inputted, final stage adds
The pressure of hot device outlet vapor, top heater outlet steam temperature obtain each heater into temperature conversion factor model
Outlet steam temperature conversion factor.
Temperature conversion factor model is as follows:
Wherein, cp(px,t'x) be x grades of calorifier inlets steam specific heat at constant pressure, unit kJkg-1·℃；cp
(pn+1,tn+1) be top heater outlet vapor specific heat at constant pressure, unit kJkg-1·℃；pxFor x grades of calorifier inlets
The pressure of steam, pn+1For the pressure of top heater outlet vapor, tn+1For the temperature of top heater outlet vapor.It can root
According to the pressure p of x grades of calorifier inlets steamxWith the vapor (steam) temperature t' after x grades of desuperheating water desuperheatsx, look into vapor thermodynamic properties chart
Obtain cp(px,t'x), it can also be according to the pressure p of top heater outlet vaporn+1With the temperature of top heater outlet vapor
tn+1, look into vapor thermodynamic properties chart and obtain cp(pn+1,tn+1)。
By above-mentioned model obtain top heater outlet steam temperature, top heater outlet steam temperature design value and
The departure of every grade of heater outlet vapor (steam) temperature, then they are inputted in total deviation model, it obtains top heater outlet and steams
The total deviation amount of stripping temperature；Total deviation model is as follows:
Wherein, ∑ Δ tn+1For the total deviation amount of top heater outlet steam temperature, Δ txFor heater outlet steam temperature
The departure of degree, tn+1For top heater outlet steam temperature,For top heater outlet steam temperature design value.
Fig. 3 is the schematic diagram that spray desuperheating influences boiler steam temperature in the embodiment of the present invention.As shown in figure 3, setting altogether
There are n grades of desuperheating waters and n grades of heaters, as n=2, temperature deviation model is as follows:
Δt1=k1·(t1-t1'), Δ t2=k2·(t2-t'2),
Wherein, Δ t1For the departure of primary heater outlet steam temperature；k1For primary heater outlet vapor temperature
Spend conversion factor；t1For the vapor (steam) temperature before first order desuperheating water desuperheat；t1' for the vapor (steam) temperature after first order desuperheating water desuperheat；
Δt2For the departure of second level heater outlet vapor (steam) temperature；k2For second level heater outlet vapor (steam) temperature conversion factor；t2
For the vapor (steam) temperature before the desuperheating water desuperheat of the second level；t'2For the vapor (steam) temperature after the desuperheating water desuperheat of the second level.
At this point, temperature conversion factor model is as follows:
Wherein, cp(p1,t1') be primary heater entrance (after first order desuperheating water desuperheat) steam specific heat at constant pressure,
cp(p3,t3) be final stage (second level) heater outlet steam specific heat at constant pressure；p1For the pressure of primary heater inlet steam
Power, p3For the pressure of top heater outlet vapor, t3For the temperature of top heater outlet vapor；cp(p2,t'2) it is the second level
The specific heat at constant pressure of calorifier inlets (after the desuperheating water desuperheat of the second level) steam, p2For the pressure of second level calorifier inlets steam
Power.
At this point, the total deviation amount of top heater outlet steam temperature are as follows:
Wherein, ∑ Δ t3For the total deviation amount of top heater outlet steam temperature,For top heater outlet vapor
Temperature design value.
It is adjusted by comparing fume side steam temperature and operates forward and backward total deviation amount ∑ Δ tn+1, can be with quantitative assessment fume side vapour
Temperature adjusts influence of the operation to unit performance driving economy.The absolute value of total deviation amount is less than cigarette after fume side steam temperature, which is adjusted, to be operated
When gas side steam temperature adjusts the absolute value for operating preceding total deviation amount, show that this adjusts operation and unit performance driving economy can be improved,
It is on the contrary then be unfavorable for unit performance driving economy.
Based on the same inventive concept, a kind of spray desuperheating is additionally provided in the embodiment of the present invention influences boiler steam temperature
Analytical equipment, the analysis method phase that boiler steam temperature is influenced with spray desuperheating due to the principle that the device solves the problems, such as
Seemingly, therefore the implementation of the device may refer to the implementation of method, and overlaps will not be repeated.
Fig. 4 is the structural block diagram for the analytical equipment that spray desuperheating influences boiler steam temperature in the embodiment of the present invention.Such as
Shown in Fig. 4, the analytical equipment that spray desuperheating influences boiler steam temperature may include:
Buggy model creating unit, for creating temperature deviation model and total deviation model；
Departure unit, after inputting the vapor (steam) temperature before every level-one desuperheating water desuperheat, every level-one desuperheating water desuperheat
Vapor (steam) temperature and each heater outlet vapor (steam) temperature conversion factor obtain heater outlet steam temperature into temperature deviation model
The departure of degree；
Total deviation amount unit, for inputting top heater outlet steam temperature, top heater outlet steam temperature is set
The departure of evaluation and every grade of heater outlet vapor (steam) temperature obtains top heater outlet steam temperature into total deviation model
Total deviation amount.
In a kind of wherein embodiment, further includes conversion factor model creating unit, is used for:
Create temperature conversion factor model；
The pressure of every grade of calorifier inlets steam, the vapor (steam) temperature after every grade of desuperheating water desuperheat are inputted, top heater goes out
The pressure of mouth steam, top heater outlet steam temperature obtain each heater outlet and steam into temperature conversion factor model
Stripping temperature conversion factor.
To sum up, the analysis method and device that the spray desuperheating of the embodiment of the present invention influences boiler steam temperature, can obtain
To the total deviation amount of heater outlet vapor (steam) temperature, the deviation for realizing vapor (steam) temperature is calculated, with a unified index quantification
It has rated fume side steam temperature and adjusts influence of the operation to unit performance driving economy.
Particular embodiments described above has carried out further in detail the purpose of the present invention, technical scheme and beneficial effects
Describe in detail it is bright, it should be understood that the above is only a specific embodiment of the present invention, the guarantor being not intended to limit the present invention
Range is protected, all within the spirits and principles of the present invention, any modification, equivalent substitution, improvement and etc. done should be included in this
Within the protection scope of invention.
Claims (10)
1. the analysis method that a kind of spray desuperheating influences boiler steam temperature characterized by comprising
Create temperature deviation model and total deviation model；
Vapor (steam) temperature after vapor (steam) temperature, every level-one desuperheating water desuperheat and each heater before inputting every level-one desuperheating water desuperheat
Outlet steam temperature conversion factor obtains the departure of heater outlet vapor (steam) temperature into the temperature deviation model；
Top heater outlet steam temperature, top heater outlet steam temperature design value and every grade of heater outlet is inputted to steam
The departure of stripping temperature obtains the total deviation amount of top heater outlet steam temperature into the total deviation model.
2. the analysis method that spray desuperheating according to claim 1 influences boiler steam temperature, which is characterized in that also wrap
It includes:
Create temperature conversion factor model；
The pressure of every grade of calorifier inlets steam, the vapor (steam) temperature after every grade of desuperheating water desuperheat are inputted, top heater outlet is steamed
The pressure of vapour, top heater outlet steam temperature obtain each heater outlet and steam into the temperature conversion factor model
Stripping temperature conversion factor.
3. the analysis method that spray desuperheating according to claim 2 influences boiler steam temperature, which is characterized in that described
Temperature deviation model is as follows:
Δtx=kx·(tx-t'x),
(x=1,2 ..., n)
Wherein, Δ txFor the departure of heater outlet vapor (steam) temperature, kxFor each heater outlet vapor (steam) temperature conversion factor；
txFor the vapor (steam) temperature before x grades of desuperheating water desuperheats, t'xFor the vapor (steam) temperature after x grades of desuperheating water desuperheats, n is the series of desuperheating water.
4. the analysis method that spray desuperheating according to claim 3 influences boiler steam temperature, which is characterized in that described
Temperature conversion factor model is as follows:
Wherein, cp(px,t'x) be x grades of calorifier inlets steam specific heat at constant pressure, cp(pn+1,tn+1) it is that top heater exports
The specific heat at constant pressure of steam；pxFor the pressure of x grades of calorifier inlets steam, pn+1For the pressure of top heater outlet vapor,
tn+1For the temperature of top heater outlet vapor.
5. the analysis method that spray desuperheating according to claim 1 influences boiler steam temperature, which is characterized in that described
Total deviation model is as follows:
Wherein, ∑ Δ tn+1For the total deviation amount of top heater outlet steam temperature, Δ txFor heater outlet vapor (steam) temperature
Departure, tn+1For top heater outlet steam temperature,For top heater outlet steam temperature design value.
6. the analytical equipment that a kind of spray desuperheating influences boiler steam temperature characterized by comprising
Buggy model creating unit, for creating temperature deviation model and total deviation model；
Departure unit, for inputting the vapor (steam) temperature before every level-one desuperheating water desuperheat, the steam after every level-one desuperheating water desuperheat
Temperature and each heater outlet vapor (steam) temperature conversion factor obtain heater outlet steam temperature into the temperature deviation model
The departure of degree；
Total deviation amount unit, for inputting top heater outlet steam temperature, top heater outlet steam temperature design value
Departure with every grade of heater outlet vapor (steam) temperature obtains top heater outlet steam temperature into the total deviation model
Total deviation amount.
7. the analytical equipment that spray desuperheating according to claim 6 influences boiler steam temperature, which is characterized in that also wrap
Conversion factor model creating unit is included, is used for:
Create temperature conversion factor model；
The pressure of every grade of calorifier inlets steam, the vapor (steam) temperature after every grade of desuperheating water desuperheat are inputted, top heater outlet is steamed
The pressure of vapour, top heater outlet steam temperature obtain each heater outlet and steam into the temperature conversion factor model
Stripping temperature conversion factor.
8. the analytical equipment that spray desuperheating according to claim 7 influences boiler steam temperature, which is characterized in that described
Temperature deviation model is as follows:
Δtx=kx·(tx-t'x),
(x=1,2 ..., n)
Wherein, Δ txFor the departure of heater outlet vapor (steam) temperature, kxFor each heater outlet vapor (steam) temperature conversion factor；
txFor the vapor (steam) temperature before x grades of desuperheating water desuperheats, t'xFor the vapor (steam) temperature after x grades of desuperheating water desuperheats, n is the series of desuperheating water.
9. the analytical equipment that spray desuperheating according to claim 8 influences boiler steam temperature, which is characterized in that described
Temperature conversion factor model is as follows:
Wherein, cp(px,t'x) be x grades of calorifier inlets steam specific heat at constant pressure, cp(pn+1,tn+1) it is that top heater exports
The specific heat at constant pressure of steam；pxFor the pressure of x grades of calorifier inlets steam, pn+1For the pressure of top heater outlet vapor,
tn+1For the temperature of top heater outlet vapor.
10. the analytical equipment that spray desuperheating according to claim 6 influences boiler steam temperature, which is characterized in that institute
It is as follows to state total deviation model:
Wherein, ∑ Δ tn+1For the total deviation amount of top heater outlet steam temperature, Δ txFor heater outlet vapor (steam) temperature
Departure, tn+1For top heater outlet steam temperature,For top heater outlet steam temperature design value.
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| CN112432157B (en) * | 2020-11-18 | 2022-12-06 | 哈尔滨锅炉厂有限责任公司 | Method for monitoring vaporization degree of desuperheating water |
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| JP2006071166A (en) * | 2004-09-01 | 2006-03-16 | Babcock Hitachi Kk | Steam temperature control device for once-through boiler |
| US7174715B2 (en) * | 2005-02-02 | 2007-02-13 | Siemens Power Generation, Inc. | Hot to cold steam transformer for turbine systems |
| CN105020692A (en) * | 2014-04-29 | 2015-11-04 | 国网山西省电力公司电力科学研究院 | Boiler smoke baffle adjusting reheating steam temperature control system of thermal power generating unit |
| CN104913291B (en) * | 2015-06-02 | 2016-11-16 | 华北电力科学研究院有限责任公司 | The detection method of Boiler Steam wall temperature of heated surface |
| CN105180136A (en) * | 2015-10-08 | 2015-12-23 | 南京信息工程大学 | Thermal-power-plant boiler main steam temperature control method based on fractional order proportional-integral (PI) dynamic matrix |
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