CN220603869U - Primary air dynamic self-optimizing control system of thermal power plant - Google Patents
Primary air dynamic self-optimizing control system of thermal power plant Download PDFInfo
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- CN220603869U CN220603869U CN202322340074.7U CN202322340074U CN220603869U CN 220603869 U CN220603869 U CN 220603869U CN 202322340074 U CN202322340074 U CN 202322340074U CN 220603869 U CN220603869 U CN 220603869U
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- 239000003245 coal Substances 0.000 claims abstract description 68
- 230000001105 regulatory effect Effects 0.000 claims description 6
- 238000011217 control strategy Methods 0.000 abstract description 2
- 238000002485 combustion reaction Methods 0.000 description 7
- 238000012423 maintenance Methods 0.000 description 7
- 238000005259 measurement Methods 0.000 description 7
- 230000008859 change Effects 0.000 description 4
- 230000007774 longterm Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 239000002817 coal dust Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000010977 unit operation Methods 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
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Abstract
The utility model discloses a primary air dynamic self-optimizing control system of a thermal power plant, which comprises the following components: the primary wind pressure function generator generates a primary wind pressure set value calibration value according to the running number of the coal mill, and the primary wind pressure set value calibration value is overlapped with a primary wind pressure manual offset value and then is input into the PID controller; the maximum and minimum hot air baffle opening function generator generates a hot air baffle maximum opening value and a hot air baffle minimum opening value according to the coal feeding amount, the hot air baffle maximum opening value is added with a hot air baffle manual offset value and then is respectively input to a large value selection block with the output end of the PID controller, the output end of the large value selection block and the hot air baffle minimum opening value are jointly input to a small value selection block, and the small value selection block outputs a hot air baffle instruction. The utility model adopts a control strategy of primary air pressure control and hot air baffle regulation limitation, and solves the problem that primary air quantity at the inlet of the coal mill cannot be automatically controlled due to inaccuracy of the traditional air quantity measuring device.
Description
Technical Field
The utility model relates to the technical field of primary air control, in particular to a dynamic self-optimizing control system for primary air of a thermal power plant.
Background
The primary air quantity of the coal mill inlet is an important guarantee for safe and stable operation of the unit. The problem of too low air quantity or too high air quantity exists in the primary air quantity control process of the coal mill inlet. The air quantity is too low, so that the pulverized coal pipe or the coal mill can be blocked, even the coal pulverizing system is exploded, the concentration of the pulverized coal can be reduced due to the insufficient air quantity, and the unit is unstable in combustion under low load. The air quantity is too high, so that the concentration of coal dust is too low, the combustion stability is influenced, the expansion joint is possibly caused to bulge, the power consumption of a primary fan is increased, the reheat steam temperature is reduced, the ignition distance of the coal dust is too far under the high air quantity, and the coal mill can be caused to lose fire and detect under the condition of low coal quantity, so that the coal mill trips.
The primary air quantity of the coal mill is ensured to have important significance to the safe and stable operation of the unit in a certain safety range, and the primary air quantity measuring device of the inlet of the conventional coal mill at present mainly comprises: wing type wind measuring device, venturi wind measuring device, power bar measuring device and D-shaped pipe wind measuring device. Wherein: the wing type wind measuring device generates a pressure difference signal through the wing, so that the wind quantity is measured; because the structure of the wind measuring device is complex, the wind measuring device is easily influenced by dust and impurities, the measurement is inaccurate, cleaning and maintenance are required after long-term operation, and the difficulty and the cost of maintenance work are increased. The Venturi wind measuring device measures wind speed by utilizing the Venturi tube principle, is also influenced by dust and impurities, and is easy to cause measurement misalignment. And the venturi tube has a complex structure and requires regular calibration and maintenance. The power bar measuring device calculates wind speed and wind quantity by measuring dynamic pressure and static pressure of air flow in the pipeline. Because of the limitation of the layout space of the powder making system, the air duct often has not enough straight pipe sections, and the accuracy of measurement is affected. In addition, the wilba measuring device needs a long measuring section, otherwise the measuring result is unstable. Moreover, the power bus measuring device cannot solve the problem of measuring mixed air, namely, cannot accurately measure the air quantity under the condition of mixing cold air and hot air. The D-type pipe wind measuring device is a common differential pressure type wind measuring device, and wind speed and wind quantity are calculated by measuring the differential pressure in a pipeline. Because the air volume measuring device is usually positioned at the mixed air section, the flow field is unstable due to the mixing of cold air and hot air, and the air volume measurement is inaccurate. Especially when cold and hot air adjusting baffle, primary air output of a primary air fan or primary air volume of a coal mill change, the corresponding relation between differential pressure change and actual air volume change is unstable, so that measurement accuracy is low. Therefore, how to improve the primary air flow measuring device is necessary to ensure the safe and stable operation of the unit and reduce the labor intensity of maintenance personnel.
In addition, because wind channel structure and primary air speed measuring device defect lead to primary air to mark the K value unstable, make coal pulverizer primary air volume and primary air temperature automatic control unable input, the operation personnel can't confirm the coal pulverizer primary air volume accurately, lead to long-term running coal pulverizer under high air volume, probably cause the buggy to catch fire the distance too far, cause the coal pulverizer to lose the fire and examine, cause the coal pulverizer tripping operation.
In summary, there are many problems in primary air quantity control at the inlet of the coal mill, including safety and economical problems caused by too low or too high air quantity, insufficient measurement accuracy caused by unstable air measuring device, and incapability of realizing automatic control caused by inconstant primary air calibration K value. Solving these problems is important to ensure safe and stable operation of the unit and to reduce maintenance workload.
Disclosure of Invention
The utility model aims to: the utility model aims to overcome the defects of the prior art, provides a dynamic self-optimizing control system for primary air of a thermal power plant, adopts a control strategy of primary air pressure control and hot air baffle adjustment limitation, and solves the problem that primary air quantity at an inlet of a coal mill cannot be automatically controlled due to inaccuracy of a traditional air quantity measuring device.
The technical scheme is as follows: the utility model relates to a primary air dynamic self-optimizing control system of a thermal power plant, which comprises the following components: a primary air pressure control loop and a hot air baffle plate regulating loop; the primary wind pressure control loop is provided with a statistics unit, a primary wind pressure function generator and a PID controller, wherein the statistics unit is used for counting the running number of the coal mill, the primary wind pressure function generator generates a primary wind pressure set value calibration value according to the running number of the coal mill, and the primary wind pressure set value calibration value is input into the PID controller after being overlapped with a primary wind pressure manual offset value; the hot air baffle adjusting circuit is provided with a maximum hot air baffle opening function generator, a minimum hot air baffle opening function generator, a large value selecting block and a small value selecting block, wherein the input ends of the maximum hot air baffle opening function generator and the minimum hot air baffle opening function generator are used for receiving the input of the coal feeding amount, the maximum hot air baffle opening function generator generates a hot air baffle maximum opening value according to the coal feeding amount, the minimum hot air baffle opening function generator generates a hot air baffle minimum opening value according to the coal feeding amount, the hot air baffle maximum opening value is overlapped with the hot air baffle manual offset value and then is respectively input to the large value selecting block with the output end of the PID controller, the output end of the large value selecting block and the hot air baffle minimum opening value are jointly input to the small value selecting block, and the small value selecting block outputs a hot air baffle instruction.
The technical scheme is further perfected, and the primary wind pressure function generator is a function relation of primary wind and a hearth differential pressure set value to be matched with the number of running coal mills.
Further, the maximum hot air baffle opening function generator and the minimum hot air baffle opening function generator are respectively the minimum hot air adjusting baffle opening and the maximum hot air adjusting baffle opening corresponding to the coal feeding quantity.
Further, the hot air baffle manual switching loop is provided with a maximum valve position limiting block and a minimum valve position limiting block, one input end of the maximum valve position limiting block and one input end of the minimum valve position limiting block are used for receiving the input of a hot air baffle opening instruction, the other input end of the maximum valve position limiting block is connected with the output end of the minimum hot air baffle opening function generator, the other input end of the minimum valve position limiting block is connected with the output end of the maximum hot air baffle opening function generator, and the output ends of the maximum valve position limiting block and the minimum valve position limiting block output the manual switching instruction through a selector.
Further, the system also comprises a primary wind pressure alarm loop, wherein the primary wind pressure alarm loop is provided with a maximum primary wind pressure function generator and a minimum primary wind pressure function generator, the input ends of the maximum primary wind pressure function generator and the minimum primary wind pressure function generator are used for receiving the input of the coal feeding quantity instruction, the maximum primary wind pressure function generator generates maximum primary wind pressure according to the coal feeding quantity, the minimum primary wind pressure function generator generates minimum primary wind pressure value according to the coal feeding quantity, and the maximum primary wind pressure value and the minimum primary wind pressure value are respectively used as a high value and a low value of the alarm.
The beneficial effects are that: compared with the prior art, the utility model has the advantages that: the utility model can generate the primary air pressure set value calibration value according to the running number of the coal mill by using the statistical unit, the primary air pressure function generator and the PID controller, and accurately control the primary air pressure by using the PID controller, so that the primary air quantity can be ensured to be in a safe and stable range, and the problems possibly caused by too low or too high air quantity, such as coal blockage of a coal powder pipe, coal blockage of the coal mill, coal powder concentration reduction and the like, are avoided.
The maximum hot air baffle opening function generator and the minimum hot air baffle opening function generator can generate the maximum hot air baffle opening value and the minimum hot air baffle opening value according to the coal feeding amount, so that the hot air baffle can be automatically adjusted according to the change of the coal feeding amount, and the stability and the high efficiency of the combustion system are maintained. Such optimization can improve pulverized coal combustion efficiency and reduce combustion instability risks.
The manual switching loop of the hot air baffle is provided with a maximum valve position limiting block and a minimum valve position limiting block, so that the opening degree of the hot air baffle can be manually switched. In this way, operators can manually control the opening of the hot air baffle under special conditions or during maintenance, and the flexibility and controllability of the system are increased.
The primary air pressure alarm loop passes through a maximum primary air pressure function generator and a minimum primary air pressure function generator, and the maximum and minimum primary air pressure values are set according to the coal feeding amount. Once the primary wind pressure exceeds the safety range, the alarm can give out a warning in time, so that operators can take measures in time, and possible dangerous situations are avoided.
In summary, the safety, stability and economy of the operation of the coal mill can be improved through accurate primary air pressure control, optimized hot air baffle adjustment, flexible manual switching and primary air pressure alarm protection, and by utilizing the advantages, the unit operation risk can be effectively reduced, the combustion efficiency is improved, the maintenance workload is reduced, and therefore the operation stability and long-term reliability of the coal mill unit of the power plant are better ensured. The air quantity control, the hot air regulating baffle and the primary air pressure limit are adopted, so that the effect of effectively breaking through the problem that the primary air quantity cannot be automatically put into operation due to inaccurate air quantity measurement is achieved, the significance of the method is that the primary air quantity automatic control is enriched, the problem that the primary air quantity automatic control cannot be achieved through transformation of an air quantity measuring device is solved on the basis of the prior art, and precious experience is provided.
Drawings
FIG. 1 is a schematic block diagram of a primary air dynamic self-optimizing control system of a thermal power plant according to the present utility model;
fig. 2 is a schematic block diagram of a primary wind pressure alarm circuit in the present utility model.
Detailed Description
The technical scheme of the utility model is described in detail below through the drawings, but the protection scope of the utility model is not limited to the embodiments.
Example 1: the primary air dynamic self-optimizing control system of the thermal power plant shown in fig. 1 comprises a primary air pressure control loop, a hot air baffle adjusting loop and a hot air baffle manual switching loop.
The system provided by the utility model is realized by adopting the existing industrial control configuration tool ForceControl of Beijing three-dimensional force control science and technology company, the configuration tool can provide a good user development interface and a simple using method in flexible and various configuration modes (instead of programming modes), various preset software modules can very easily realize and complete various functions of a monitoring layer, can simultaneously support computers and I/0 equipment of various hardware manufacturers, is combined with a highly reliable industrial control computer and a network system, can provide all interfaces of software and hardware for a control layer and a management layer, and can perform system integration.
The primary wind pressure control loop is provided with a statistics unit, a primary wind pressure function generator F1 (X) and a PID controller, wherein the statistics unit is used for counting the running number of the coal mill, the primary wind pressure function generator F1 (X) generates a primary wind pressure set value calibration value according to the running number of the coal mill, and the primary wind pressure set value calibration value is input into the PID controller after being overlapped with the primary wind pressure manual offset value.
And through combustion adjustment tests on different numbers of coal mills and different load sections, the primary air and hearth differential pressure set value is fitted into a function of the running number of the coal mills, so that the calibration of the primary air quantity set value is realized.
The hot air baffle adjusting loop is provided with a maximum hot air baffle opening function generator, a minimum hot air baffle opening function generator, a large value selecting block and a small value selecting block, wherein the input ends of the maximum hot air baffle opening function generator and the minimum hot air baffle opening function generator are used for receiving the input of coal feeding quantity, the maximum hot air baffle opening function generator generates a hot air baffle maximum opening value according to the coal feeding quantity, the minimum hot air baffle opening function generator generates a hot air baffle minimum opening value according to the coal feeding quantity, the hot air baffle maximum opening value is overlapped with a hot air baffle manual offset value and then is respectively input to the large value selecting block with the output end of the PID controller, the output end of the large value selecting block and the hot air baffle minimum opening value are jointly input to the small value selecting block, and the small value selecting block outputs a hot air baffle instruction.
Logic is added at the output of the PID regulator, and the minimum hot air baffle opening function generator F2 (X) and the maximum hot air baffle opening function generator F3 (X) are introduced for calibrating the regulating output of the hot air baffle through the minimum and maximum hot air regulating baffle opening corresponding to the coal feeding amount obtained by refining the operation data in a period.
The manual switching loop of the hot air baffle is provided with a maximum valve position limiting block and a minimum valve position limiting block, one input end of the maximum valve position limiting block and one input end of the minimum valve position limiting block are used for receiving the input of the opening instruction of the hot air baffle, the other input end of the maximum valve position limiting block is connected with the output end of the opening function generator of the minimum hot air baffle, the other input end of the minimum valve position limiting block is connected with the output end of the opening function generator of the maximum hot air baffle, and the output ends of the maximum valve position limiting block and the minimum valve position limiting block output the manual switching instruction through a selector.
The valve position limiting loop is placed between the PID regulator and the manual/automatic mode to ensure that the valve position is controlled within the allowable range to avoid valve position disturbances.
Example 2: in order to facilitate operators to timely know the condition of primary air quantity of the coal mill, primary air pressure is introduced to assist in judging the condition of primary air quantity. Determining the maximum and minimum primary air pressure values allowed under different coal amounts, and introducing a primary air pressure alarm loop to enable the primary air quantity of the coal mill to run under the reference air pressure, thereby assisting in judging the primary air quantity condition
As shown in fig. 2, the primary air pressure alarm loop has a maximum primary air pressure function generator F5 (X) and a minimum primary air pressure function generator F4 (X), wherein the input ends of the maximum primary air pressure function generator F5 (X) and the minimum primary air pressure function generator F4 (X) are used for receiving the input of the coal feeding amount instruction, the maximum primary air pressure function generator F5 (X) generates the maximum primary air pressure according to the coal feeding amount, and the minimum primary air pressure function generator F4 (X) generates the minimum primary air pressure value according to the coal feeding amount, and the maximum primary air pressure value and the minimum primary air pressure value are respectively used as the high value and the low value of the alarm.
As described above, although the present utility model has been shown and described with reference to certain preferred embodiments, it is not to be construed as limiting the utility model itself. Various changes in form and details may be made therein without departing from the spirit and scope of the utility model as defined by the appended claims.
Claims (5)
1. Primary air dynamic self-optimizing control system of thermal power plant, its characterized in that includes: a primary air pressure control loop and a hot air baffle plate regulating loop;
the primary wind pressure control loop is provided with a statistics unit, a primary wind pressure function generator and a PID controller, wherein the statistics unit is used for counting the running number of the coal mill, the primary wind pressure function generator generates a primary wind pressure set value calibration value according to the running number of the coal mill, and the primary wind pressure set value calibration value is input into the PID controller after being overlapped with a primary wind pressure manual offset value;
the hot air baffle adjusting circuit is provided with a maximum hot air baffle opening function generator, a minimum hot air baffle opening function generator, a large value selecting block and a small value selecting block, wherein the input ends of the maximum hot air baffle opening function generator and the minimum hot air baffle opening function generator are used for receiving the input of the coal feeding amount, the maximum hot air baffle opening function generator generates a hot air baffle maximum opening value according to the coal feeding amount, the minimum hot air baffle opening function generator generates a hot air baffle minimum opening value according to the coal feeding amount, the hot air baffle maximum opening value is overlapped with the hot air baffle manual offset value and then is respectively input to the large value selecting block with the output end of the PID controller, the output end of the large value selecting block and the hot air baffle minimum opening value are jointly input to the small value selecting block, and the small value selecting block outputs a hot air baffle instruction.
2. The primary air dynamic self-optimizing control system of a thermal power plant according to claim 1, wherein: the primary wind pressure function generator is a function relation of primary wind and a hearth differential pressure set value to be fit into the running number of the coal mill.
3. The primary air dynamic self-optimizing control system of a thermal power plant according to claim 1, wherein: the maximum hot air baffle opening function generator and the minimum hot air baffle opening function generator are respectively the minimum and maximum hot air regulating baffle opening corresponding to the coal feeding amount.
4. The primary air dynamic self-optimizing control system of a thermal power plant according to claim 1, wherein: the hot air baffle manual switching circuit is provided with a maximum valve position limiting block and a minimum valve position limiting block, one input end of the maximum valve position limiting block and one input end of the minimum valve position limiting block are used for receiving the input of a hot air baffle opening instruction, the other input end of the maximum valve position limiting block is connected with the output end of the minimum hot air baffle opening function generator, the other input end of the minimum valve position limiting block is connected with the output end of the maximum hot air baffle opening function generator, and the output ends of the maximum valve position limiting block and the minimum valve position limiting block output the manual switching instruction through a selector.
5. The primary air dynamic self-optimizing control system of a thermal power plant according to claim 1, wherein: the system also comprises a primary wind pressure alarm loop, wherein the primary wind pressure alarm loop is provided with a maximum primary wind pressure function generator and a minimum primary wind pressure function generator, the input ends of the maximum primary wind pressure function generator and the minimum primary wind pressure function generator are used for receiving the input of the coal feeding quantity instruction, the maximum primary wind pressure function generator generates maximum primary wind pressure according to the coal feeding amount, and the minimum primary wind pressure function generator generates minimum primary wind pressure value according to the coal feeding amount, wherein the maximum primary wind pressure value and the minimum primary wind pressure value are respectively used as a high value and a low value of the alarm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322340074.7U CN220603869U (en) | 2023-08-30 | 2023-08-30 | Primary air dynamic self-optimizing control system of thermal power plant |
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| CN202322340074.7U CN220603869U (en) | 2023-08-30 | 2023-08-30 | Primary air dynamic self-optimizing control system of thermal power plant |
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- 2023-08-30 CN CN202322340074.7U patent/CN220603869U/en active Active
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