CN205450588U - Boiler control parameter dynamic state adjusting device based on calorific capacity - Google Patents
Boiler control parameter dynamic state adjusting device based on calorific capacity Download PDFInfo
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- CN205450588U CN205450588U CN201620108224.9U CN201620108224U CN205450588U CN 205450588 U CN205450588 U CN 205450588U CN 201620108224 U CN201620108224 U CN 201620108224U CN 205450588 U CN205450588 U CN 205450588U
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- 239000003245 coal Substances 0.000 claims abstract description 35
- 230000010354 integration Effects 0.000 claims description 10
- 238000006243 chemical reaction Methods 0.000 claims description 6
- 230000033228 biological regulation Effects 0.000 description 4
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 239000003546 flue gas Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 238000005338 heat storage Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
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Abstract
The utility model discloses a boiler control parameter dynamic state adjusting device based on calorific capacity, including a plurality of analog quantity generators, analog quantity switch and PID controller, the Z1 end of first analog quantity switch and the Z1 end of second analog quantity switch are connected through a function generator, the 2nd function generator respectively to first analog quantity generator, and the proportion end and the total mark end of PID controller are connected respectively to the output of first analog quantity switch and second analog quantity switch, the Z2 end of first analog quantity switch is connected to second analog quantity generator, the Z2 end of second analog quantity switch is connected to third analog quantity generator. The utility model discloses can go into proportion and total mark parameter in how many automatic adjustment boiler control wares of stove calorific value of coal according to the unit, realize the quick accurate response of unit owner air pressure control, guarantee the holistic harmonious steady operation of unit on the one hand, the on the other hand volume of ensureing the coal is unlikely to too much or the not enough boiler efficiency that influences.
Description
Technical field
This utility model relates to thermal power unit boiler control field, particularly relates to a kind of boiler control parameters dynamic adjusting device based on caloric value.
Background technology
Along with the continuous increase of new-energy grid-connected, load growth and electrical network scale, at extra-high voltage grid and interconnection power system under the new situation, grid contacts at different levels are day by day tight, and between electrical network and unit, the requirement of cooperation is more and more higher.Fired power generating unit requires day by day to improve as the Main Means of peak-frequency regulation, the control to load.As generating set primary frequency regulation function mainly regulates door by the vapour that enters of regulation DEH system, utilize boiler heat storage, in the case of electrical network occurs extremely, the requirement of quick responsive electricity grid, electric power grid frequency stabilization；According to network load, Automation generation control requires that varying loading controls target, to make up network load gap, maintain the safety of electrical network.Net capacity is increasing, the quality of electric energy is also required that more and more higher, safe and stable operation for electrical network, each Large-scale fire-electricity unit is desirable that input AGC function, require that AGC controls the load range of unit greatly (typically requiring 50%--100% rated load), and require that unit possesses quick, accurate, stable response load variations demand.Along with increase and the increase of electricity consumption side load peak-valley difference of China's power industry installed capacity, Large-scale fire-electricity unit is often in wide load section operation, and scope is typically in 50%～100% rated load.
The caloric value of coal is one of important indicator of coal analysis, and caloric value is the highest, and the heat energy power of conversion is the most, and economic worth is the biggest.The caloric value of coal is with the theoretical air requirement of boiler, theoretical dry flue gas amount and wet flue gas amount, and theoretical temperature combustion is relevant.Therefore, the caloric value of coal is significant data during design boiler.
Unit is when putting into AGC, it is however generally that coordinated control mode is that steamer pusher side carries out spatial load forecasting, for single-loop system, fairly simple；Boiler side controls pressure, relates to many factors, for ensureing that the parameter such as pressure, temperature is suitable, wind, coal, water need to be coordinated action.As a example by conventional subcritical drum boiler, its change exported by boiler master, band wind symptom, coal are with suitable proportioning common action, thus ensure stablizing of main steam pressure, and conventional subcritical dum boiler controls device as shown in Figure 1.I.e. by signal picker, main vapour pressure measured value and main vapour pressure setting value are delivered to respectively PV and the SP end of boiler controller, follow pressure set points fast and accurately by PI (proportional, integral) control realization pressure measuring value to change, wherein, ratio K and integration Ti are generally set as a fixed value according to change magnitude relation during test, keep constant.
This control system is when unit ature of coal is stablized, it is preferable that the major parameters such as pressure control effect, it is able to ensure that the examinations such as AGC reach scheduling requirement, but change in caloric value, when especially changing greatly, the major parameter fluctuations such as pressure are relatively big, affect response speed and the control accuracy of load, thus cause AGC examination quality the most up to standard.Main reason is that the logic parameter that traditional thermal power unit boiler is arranged in controlling is changeless, but due to coal and the change of ature of coal, the namely change of caloric value, the energy consumption characteristics and the control characteristic that cause unit under varying load condition there occurs notable change, too much or the not enough build-up of pressure fluctuation of furnace coal weight acutely, has influence on the coordinated operation that unit is overall.
Utility model content
This utility model is in order to solve the problems referred to above, propose a kind of boiler control parameters dynamic adjusting device based on caloric value, this utility model device can be according to the ratio in how many automatic adjustment boiler controllers of unit as-fired coal caloric value and integral parameter, realize the quick and precisely response that unit main vapour pressure controls, and then ensure the stable coordination operation that unit is overall.
To achieve these goals, this utility model adopts the following technical scheme that
A kind of boiler control parameters dynamic adjusting device based on caloric value, including multiple analog generators, analog quantity switch and PID controller, wherein, analog generator includes the first analog generator, second analog generator and the 3rd analog generator, described first analog generator is respectively by the first functional generator, second functional generator connects Z1 end and the Z1 end of the second analog quantity switch of the first analog quantity switch, the outfan of the first analog quantity switch and the second analog quantity switch connects ratio end and the integration end of PID controller respectively；
Described second analog generator connects the Z2 end of the first analog quantity switch, and described 3rd analog generator connects the Z2 end of the second analog quantity switch.
The analog quantity of described first analog generator output is unit as-fired coal caloric value.
The analog quantity of described second analog generator output is former boiler controller PID ratio value.
The analog quantity of described 3rd analog generator output is former boiler controller PID integrated value.
PV, SP end of described PID controller is connected to a signal picker, and the signal picker being connected with SP end gathers main vapour pressure measured value, and the signal picker being connected with PV end gathers main vapour pressure setting value.
The S end of described first analog quantity switch and the second analog quantity switch is respectively connected with and is manually entered device.
Further, when switching to dynamic state of parameters adjustment modes, described in be manually entered the switching value of device be 1, now, the set end of the first analog quantity switch and the second analog quantity switch is 1, and its output is the input value of Z1 end.
When switching to dynamic state of parameters adjustment modes, the ratio end input value of PID controller is the value that as-fired coal caloric value generates after the first functional generator conversion, and the input value of integration end is the value that as-fired coal caloric value generates after the second functional generator conversion.
Operation principle of the present utility model is: unit as-fired coal caloric value is the highest, and the ratio value K of boiler PID controller and integrated value Ti are the least；Otherwise, unit as-fired coal caloric value is the lowest, and the ratio value K of boiler PID controller and integrated value Ti are the biggest.
The beneficial effects of the utility model are:
(1) can be according to the ratio in how many automatic adjustment boiler controllers of unit as-fired coal caloric value and integral parameter, realize the quick and precisely response that unit main vapour pressure controls, on the one hand ensure the stable coordination operation that unit is overall, on the other hand guarantee that coal amount is unlikely to too much or not enough and affects boiler efficiency；
(2) the main vapour pressure quality of grid-connected unit directly influences the quality that unit load controls; and then have influence on unit to the response speed of mains frequency demand and precision; boiler controller parameter can be dynamically adjusted by this utility model; effectively guarantee that unit main vapour pressure is controlled; guarantee pressure regulation quality; ensure unit load regulating power, and then guarantee stablizing of mains frequency.
Accompanying drawing explanation
Fig. 1 is conventional thermal power unit boiler control system schematic diagram；
Fig. 2 is this utility model boiler control parameters based on caloric value dynamic adjusting device schematic diagram.
Detailed description of the invention:
The utility model is described in further detail with embodiment below in conjunction with the accompanying drawings.
As in figure 2 it is shown, a kind of boiler control parameters dynamic adjusting device based on caloric value, including: signal picker S, analog generator A, functional generator F (x), analog quantity switch AXSEL, it is manually entered device D/MA and boiler controller PID；
Analog generator A1 is after functional generator F1 (x), F2 (x) conversion, deliver to analog quantity switch AXSEL1 and the Z1 end of analog quantity switch AXSEL2 respectively, deliver to the ratio end K and integration end Ti of boiler controller PID the most respectively.
The value of analog generator A1 is particularly as follows: unit as-fired coal caloric value.
The value of analog generator A2 is particularly as follows: former boiler controller PID ratio value K.
The value of analog generator A3 is particularly as follows: former boiler controller PID integrated value Ti.
Analog generator A2, A3 connection mode analog quantity switch AXSEL1 and the Z2 end of analog quantity switch AXSEL2 respectively.
PV, SP end of boiler controller PID receives the collection value of two signal picker S respectively.
It is manually entered device D/MA and is respectively connected to analog quantity switch AXSEL1 and the set end of analog quantity switch AXSEL2, when switching to dynamic state of parameters adjustment modes, manually put switching value " 1 ", now, the set end of analog quantity switch AXSEL1 and analog quantity switch AXSEL2 is " 1 ", and its output is Z1 end input value.Now, the ratio end K input value of boiler controller PID is the value that as-fired coal caloric value generates after functional generator F1 (x) is changed, and integration end Ti input value is the value that as-fired coal caloric value generates after functional generator F2 (x) is changed.
Operation principle of the present utility model: unit as-fired coal caloric value is the highest, the ratio value K of boiler controller PID and integrated value Ti are the least；Otherwise, unit as-fired coal caloric value is the lowest, and the ratio value K of boiler controller PID and integrated value Ti are the biggest.
Concrete example 1:
As a example by conventional 300MW Subcritical Units, boiler is single burner hearth balanced draft, resuperheat, Natural Circulation single-drum boiler, and maximum continuous evaporation amount 1025t/h, design coal caloric value is 4500 kilocalories.
First carry out functional generator, the conversion factor of F2 (x) calculates, boiler master PID former scale parameter K is 2.4, and the time of integration, Ti was 260s, adds up this unit as-fired coal caloric value scope between 3500-6000 kilocalorie, therefore, function F1 (x) expression formula may be configured as
When unit is provided without boiler master pid parameter dynamic adjustment modes, it is manually entered device D/MA and is output as switching value " 0 ", the set end of analog quantity switch AXSEL1 and analog quantity switch AXSEL2 is " 0 ", its output is Z2 end input value, the most now boiler controller PID scale parameter K and for the time of integration Ti keep original numerical value, respectively 2.4 and 260.
When unit uses boiler master pid parameter dynamic adjustment modes, run controllers manually loader D/MA and manually put switching value " 1 ", the set end of analog quantity switch AXSEL1 and analog quantity switch AXSEL2 is " 1 ", and its output is Z1 end input value；If now, unit as-fired coal caloric value is 5000 kilocalories, then operations staff inserts numerical value 5000 at analog generator A1, the ratio end K input value of boiler controller PID is the value 2.25 that as-fired coal caloric value generates after functional generator F1 (x) is changed, and integration end Ti input value is the value 240 that as-fired coal caloric value generates after functional generator F2 (x) is changed.I.e. when unit as-fired coal caloric value raises, ratio and integral action all die down, to avoid furnace coal weight excessive build-up of pressure Control platform to be deteriorated.
Although detailed description of the invention of the present utility model is described by the above-mentioned accompanying drawing that combines; but the not restriction to this utility model protection domain; one of ordinary skill in the art should be understood that; on the basis of the technical solution of the utility model, those skilled in the art need not to pay various amendments or deformation that creative work can make still within protection domain of the present utility model.
Claims (8)
1. a boiler control parameters dynamic adjusting device based on caloric value, it is characterized in that: include multiple analog generator, analog quantity switch and PID controller, wherein, analog generator includes the first analog generator, second analog generator and the 3rd analog generator, described first analog generator is respectively by the first functional generator, second functional generator connects Z1 end and the Z1 end of the second analog quantity switch of the first analog quantity switch, the outfan of the first analog quantity switch and the second analog quantity switch connects ratio end and the integration end of PID controller respectively；
Described second analog generator connects the Z2 end of the first analog quantity switch, and described 3rd analog generator connects the Z2 end of the second analog quantity switch.
A kind of boiler control parameters dynamic adjusting device based on caloric value, is characterized in that: the analog quantity of described first analog generator output is unit as-fired coal caloric value.
A kind of boiler control parameters dynamic adjusting device based on caloric value, is characterized in that: the analog quantity of described second analog generator output is former boiler controller PID ratio value.
A kind of boiler control parameters dynamic adjusting device based on caloric value, is characterized in that: the analog quantity of described 3rd analog generator output is former boiler controller PID integrated value.
A kind of boiler control parameters dynamic adjusting device based on caloric value, it is characterized in that: PV, SP end of described PID controller is connected to a signal picker, the signal picker being connected with SP end gathers main vapour pressure measured value, and the signal picker being connected with PV end gathers main vapour pressure setting value.
A kind of boiler control parameters dynamic adjusting device based on caloric value, is characterized in that: the S end of described first analog quantity switch and the second analog quantity switch is respectively connected with and is manually entered device.
A kind of boiler control parameters dynamic adjusting device based on caloric value, it is characterized in that: when switching to dynamic state of parameters adjustment modes, the described switching value being manually entered device is 1, now, the set end of the first analog quantity switch and the second analog quantity switch is 1, and its output is the input value of Z1 end.
A kind of boiler control parameters dynamic adjusting device based on caloric value, it is characterized in that: when switching to dynamic state of parameters adjustment modes, the ratio end input value of PID controller is the value that as-fired coal caloric value generates after the first functional generator conversion, and the input value of integration end is the value that as-fired coal caloric value generates after the second functional generator conversion.
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| CN201620108224.9U CN205450588U (en) | 2016-02-03 | 2016-02-03 | Boiler control parameter dynamic state adjusting device based on calorific capacity |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107728464A (en) * | 2017-09-25 | 2018-02-23 | 国网山东省电力公司电力科学研究院 | Boiler optimization control system and method based on integral parameter dynamic adjustment |
| CN109114548A (en) * | 2018-09-10 | 2019-01-01 | 国家能源投资集团有限责任公司 | Coal control method is given in the burning of supercritical circulating fluidized bed boiler |
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2016
- 2016-02-03 CN CN201620108224.9U patent/CN205450588U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107728464A (en) * | 2017-09-25 | 2018-02-23 | 国网山东省电力公司电力科学研究院 | Boiler optimization control system and method based on integral parameter dynamic adjustment |
| CN109114548A (en) * | 2018-09-10 | 2019-01-01 | 国家能源投资集团有限责任公司 | Coal control method is given in the burning of supercritical circulating fluidized bed boiler |
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