CN113587141A - Automatic regulation and control system of thermal power generating unit combustor pivot angle - Google Patents
Automatic regulation and control system of thermal power generating unit combustor pivot angle Download PDFInfo
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- 230000033228 biological regulation Effects 0.000 title claims abstract description 17
- 239000003245 coal Substances 0.000 claims abstract description 112
- 230000008859 change Effects 0.000 claims abstract description 62
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 50
- 239000004071 soot Substances 0.000 claims abstract description 41
- 238000007664 blowing Methods 0.000 claims abstract description 40
- 238000010438 heat treatment Methods 0.000 claims abstract description 16
- 230000001105 regulatory effect Effects 0.000 claims abstract description 12
- 238000000746 purification Methods 0.000 claims abstract description 7
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 5
- 230000009467 reduction Effects 0.000 claims description 15
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- 238000004519 manufacturing process Methods 0.000 description 5
- 239000000843 powder Substances 0.000 description 5
- 238000004939 coking Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000000875 corresponding effect Effects 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N5/00—Systems for controlling combustion
- F23N5/26—Details
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B11/00—Automatic controllers
- G05B11/01—Automatic controllers electric
- G05B11/36—Automatic controllers electric with provision for obtaining particular characteristics, e.g. proportional, integral, differential
- G05B11/42—Automatic controllers electric with provision for obtaining particular characteristics, e.g. proportional, integral, differential for obtaining a characteristic which is both proportional and time-dependent, e.g. P.I., P.I.D.
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Abstract
The invention discloses an automatic regulating and controlling system for a thermal power generating unit combustor pivot angle, which comprises an organic group load and coal quantity change signal, a primary air pressure change vector signal, a desuperheating water signal, a soot blowing working condition signal, a coal mill working condition signal and a pivot angle automatic PID; the unit load and coal amount change signals can regulate and control the swing angle of the combustor in advance according to the initial change conditions of AGC load and coal amount; the primary wind pressure change vector signal can regulate and control the swing angle of the burner in advance according to the early steam temperature change in the furnace of the burner; the temperature-reducing water signal can adjust and control the swing angle of the combustor according to the front-back temperature difference of the temperature reducer; the soot blowing working condition signal regulates and controls the swing angle of the combustor according to the degree of dirt purification when soot blowing is carried out on each heating surface under the soot blowing working condition; the automatic swinging angle of the burner is beneficial to improving the economy and the safety of the unit, and simultaneously, the labor intensity of personnel in front of the plate can be reduced; the regulation and control of the swing angle of the burner are necessary parts and difficulties for the combustion regulation of the boiler, so the swing angle of the burner is automatically suitable for wide popularization.
Description
Technical Field
The invention relates to the technical field of burners, in particular to an automatic regulating and controlling system for a swing angle of a burner of a thermal power generating unit.
Background
The boiler combustion adjustment process is an operation process with high integration level, a person needs to master high professional technology and concept before the boiler is started, meanwhile, the person who needs to monitor the boiler cannot release the concept at high concentration all the time, especially, the adjustment of the swing angle of the combustor is often careless when the unit is under working conditions such as variable load and the like, accurate regulation and control cannot be realized, and the steam temperature and the steam pressure often fluctuate greatly. The use of the swing angle of the burner is of great importance to the combustion stability of the boiler, the operation habit of operators and the change of unit parameters can generate different adjustment of the swing angle of the burner, and the swing angle of the burner is controlled to be in a tired situation when the operation of soot blowing, starting and stopping a coal pulverizer and the like is met. If can realize combustor pivot angle automatic tracking and realize man-machine perfect interaction, can furthest's liberation before the dish personnel's energy undoubtedly, can avoid the unstable fluctuation of boiler combustion operating mode simultaneously. In the actual production of thermal power generating units, the steam temperature is used as a regulation signal for swing angle automatic operation, but as a result, the swing angle continuously acts along with the change of the steam temperature, the central position of the flame of a boiler is unstable, the combustion of the boiler is always in a large fluctuation state, finally, the swing angle automatic attempt is not successful, and the swing angle automatic attempt is always an industry problem and is not reached by people.
Disclosure of Invention
The invention aims to provide an automatic regulating and controlling system for a thermal power generating unit combustor pivot angle, which solves more than one problem in the background technology.
In order to achieve the purpose, the invention adopts the following scheme: an automatic regulating and controlling system for a thermal power generating unit combustor swing angle comprises an organic unit load and coal quantity change signal, a primary air pressure change vector signal, a desuperheating water signal, a soot blowing working condition signal, a coal mill working condition signal and a swing angle automatic PID;
the unit load and coal amount change signal can regulate and control the swing angle of the combustor in advance according to the initial change condition of AGC load and coal amount;
the primary wind pressure change vector signal can regulate and control the swing angle of the combustor in advance according to the early steam temperature change in the combustor;
the temperature-reducing water signal can adjust and control the swing angle of the combustor in front according to the front-back temperature difference of the temperature reducer;
the soot blowing working condition signal can regulate and control the swing angle of the combustor according to the degree of dirt purification when soot blowing is carried out on each heating surface under the soot blowing working condition;
the coal mill is started under the working condition, the different influences of wind and coal on the steam temperature are considered, and the change lead of the wind and the coal is fully considered to regulate and control the swing angle of the combustor;
and the automatic PID of the swing angle is in communication connection with a unit load and coal quantity change signal, a primary air pressure change vector signal, a desuperheating water signal, a soot blowing working condition signal and a coal mill working condition signal.
Further, the unit load and coal amount change signals comprise a load reduction adjusting signal, wherein the step of executing the load reduction adjusting signal comprises the following steps of,
a 1: whether the AGC command is smaller than the actual load of 5MW or not, if not, the swing angle of the combustor does not need to be adjusted, and if yes, the step b1 is executed;
b 1: if the accumulated coal reduction amount is smaller than the threshold value, returning to the step a1 if the accumulated coal reduction amount is not smaller than the threshold value, and executing the step c1 if the accumulated coal reduction amount is smaller than the threshold value;
c 1: if the sum of the flow rate of the reduced temperature water at the side of the reheater A, B is smaller than the threshold value, if not, returning to the step a1, and if so, executing the step d 1;
d 1: whether the swinging position of the burner is smaller than minus 6 degrees or not, if not, the swinging angle of the load-reducing coal amount is upward 5 percent, and if so, the swinging angle of the load-reducing coal amount is upward 10 percent;
e 1: and (4) after the swing angle is regulated and controlled, delaying for 20 seconds, and returning to the step (a).
Further, the primary wind pressure variation vector signal comprises a loading manual primary wind pressure adjusting signal, wherein the execution of the loading manual primary wind pressure adjusting signal comprises the following steps,
a 2: whether the rise per minute of primary wind pressure is larger than a threshold value or not, if not, the swing angle of the burner does not need to be adjusted, and if so, the step b2 is executed;
b 2: whether the temperature of the steam at the outlets of the superheater A side and the superheater B side rises every minute is larger than a threshold value, if not, returning to the step a2, and if so, executing the step c 2;
c 2: whether the total outlet temperature of the reheater is larger than a threshold value or not, if not, returning to the step a2, and if so, executing the step d 2;
d 2: the primary wind increases the yaw angle by 5%, and then returns to step a 2.
Further, the temperature-reduced water signal comprises a temperature-reduced water flow small adjusting signal, wherein executing the temperature-reduced water flow small adjusting signal comprises the following steps,
a 3: whether the sum of the flow rates of the attemperation water on the A side and the B side of the reheater is smaller than a threshold value or not is judged, if not, the swing angle of the burner does not need to be adjusted, and if yes, the time is delayed for 3 minutes;
b 3: delaying for 3 minutes, judging whether the temperature of the main steam is less than a threshold value 1, if not, returning to the step a3, and if so, executing a step c3 a; whether the temperature of the reheater is smaller than the threshold value 2, if not, returning to the step a3, and if so, executing the step c3 b;
c3 a: delaying for 3 minutes again, judging whether the temperature of the reheater is smaller than a threshold value 1, if not, returning to the step a3, if so, delaying for 3 minutes and then executing the step d 3;
c3 b: after delaying for another 2 minutes, executing step d 3;
d 3: delaying for 15 minutes after the flow of the temperature-reducing water is less than 5 percent of the open swing angle, and returning to the step a 3.
Further, executing the soot blowing condition signal includes the steps of,
a 4: whether soot blowing is carried out or not, if not, the swinging angle of the burner does not need to be adjusted, and if so, the step b4 is executed;
b 4: whether the temperature difference between the steam on the A side or the steam on the B side of the reheater is larger than a threshold value or not, if not, returning to the step a4, and if so, executing the step c 4;
c 4: whether the sum of the flow rates of the desuperheating water at the A side and the B side of the reheater is larger than a threshold value or not is judged, if not, the step a4 is returned, and if yes, the step d4 is executed;
d 4: and (4) whether the swing angle position of the burner is larger than minus 6 degrees, if not, closing the swing angle of the temperature-reducing water flow by 5 percent, delaying for 5 minutes, then returning to the step a4, and if so, closing the swing angle of the temperature-reducing water flow by 10 percent, delaying for 5 minutes, and then returning to the step a 4.
Further, the coal mill working condition signal comprises an E mill adjusting signal, wherein the step of executing the E mill adjusting signal comprises the following steps of,
a 5: closing a coal mill E;
b 5: e, grinding a swing angle of a switch by 10%;
c 5: within 10 minutes of starting the mill, if the opening degrees of the hot and cold primary air regulating valves of the coal mill E are larger than threshold values, executing step d5a, if the coal quantity of the coal mill E reaches 30% of the total output, executing step d5b, and if the coal quantity of the coal mill E reaches 60% of the total output, executing step d5 c;
d5 a: e, grinding a swing angle of a switch to be turned on and off by 5 percent;
d5 b: e, grinding a swing angle of a switch by 10%;
d5 c: e, grinding the starting swing angle by 12 percent.
In conclusion, the invention has the beneficial effects that: in actual production, the application of the invention is relatively basic, and some PID control and acquisition points in common thermal engineering aspects are adopted, but the automatic application of the swing angle of the combustor obtains better effect through innovative thinking and perfect combination of thermal control and operation; in the production practice, the automatic tracking of the swing angle of the burner is to greatly increase the temperature of the reheated steam by more than 6 ℃, meanwhile, the times, the amplitude and the time for overtemperature of the steam temperature are less, and the overtemperature is avoided by continuously pressing the steam temperature when the swing angle is manually controlled; tests show that the automatic swinging angle of the burner is beneficial to improving the economy and the safety of the unit, and simultaneously, the labor intensity of personnel in front of the plate can be reduced; the regulation and control of the swing angle of the burner are necessary parts and difficulties for the combustion regulation of the boiler, so the swing angle of the burner is automatically suitable for wide popularization.
Drawings
FIG. 1 is a schematic flow chart of the load-shedding adjustment signal of the present invention.
Fig. 2 is a schematic flow chart of the primary wind pressure adjusting signal of the present invention by loading hand.
FIG. 3 is a schematic flow chart of the small adjustment signal for desuperheating water flow according to the present invention.
FIG. 4 is a schematic flow chart of the signal of the soot blowing condition of the present invention.
FIG. 5 is a schematic flow chart of the E-mill adjustment signal of the present invention.
FIG. 6 is a schematic flow chart of burner oscillation according to the present invention.
Fig. 7 is a flow chart of the burner oscillation automatic tracking control program according to the present invention.
Detailed Description
The following detailed description provides many different embodiments or examples for implementing the invention. Of course, these are merely embodiments or examples and are not intended to be limiting. In addition, repeated reference numbers, such as repeated numbers and/or letters, may be used in various embodiments. These iterations are for simplicity and clarity of describing the present invention and are not intended to represent a particular relationship between the various embodiments and/or configurations discussed.
Furthermore, spatially relative terms, such as "below" … "," below "," inside-out "," above "," upper "and the like, may be used herein to facilitate describing one element or feature's relationship to another element or feature during use or operation of the device, and may include different orientations of the device during use or operation of the device as illustrated in the figures. The devices may be rotated 90 degrees or other orientations from different orientations and the spatially relative descriptors used therein should be interpreted as such and are not to be construed as limiting the invention, and the terms "first" and "second" are used for descriptive purposes only and are not intended to indicate or imply relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.
The invention is further described in the following figures and detailed description: as shown in fig. 1 to 7, the system for automatically regulating and controlling the swing angle of the combustor of the thermal power generating unit comprises an organic group load and coal quantity change signal, a primary air pressure change vector signal, a desuperheating water signal, a soot blowing working condition signal, a coal mill working condition signal and a swing angle automatic PID;
the unit load and coal amount change signal can regulate and control the swing angle of the combustor in advance according to the initial change condition of AGC load and coal amount;
the primary wind pressure change vector signal can regulate and control the swing angle of the combustor in advance according to the early steam temperature change in the combustor;
the temperature-reducing water signal can adjust and control the swing angle of the combustor in front according to the front-back temperature difference of the temperature reducer;
the soot blowing working condition signal can regulate and control the swing angle of the combustor according to the degree of dirt purification when soot blowing is carried out on each heating surface under the soot blowing working condition;
the coal mill is started under the working condition, the different influences of wind and coal on the steam temperature are considered, and the change lead of the wind and the coal is fully considered to regulate and control the swing angle of the combustor;
and the automatic PID of the swing angle is in communication connection with a unit load and coal quantity change signal, a primary air pressure change vector signal, a desuperheating water signal, a soot blowing working condition signal and a coal mill working condition signal.
Aiming at the characteristics of producing the actual swing angle of the combustor, the boiler combustion is divided into 5 modes in the automatic logic of the swing angle of the combustor, namely: the method comprises a normal load energy-saving mode, a variable load mode, a soot blowing mode, a coal mill starting and stopping mode and an accident handling mode, wherein programs are written in a dispersing mode through automatic and different logics of swing angles corresponding to different combustion modes, finally, weighting relation coefficients are carried out on the different modes to distribute the influence of each working condition on the swing angles, and finally, a control logic concept of dispersing firstly and then concentrating is formed.
In consideration of safety and economy, an operation mode mainly adjusting the swing angle of the burner and secondarily adjusting the temperature-reducing water is required to be gradually realized through automatic coordinated control of the swing angle of the burner and the temperature-reducing water; therefore, the action of the swing angle needs to be ahead of the action of the desuperheating water most of the time, and the action signal of the desuperheating water regulating valve is derived from the change of the steam temperature, so the swing angle must be introduced as an advance control signal in preference to the reference quantity of the steam temperature change to achieve the aim.
When the AGC load instruction of the unit is changed, under the action of unit coordination control, the coal amount on the furnace side can track the load change, the main and reheated steam temperatures are not changed at the initial stage of the change of the load and the coal amount, and then the change of the combustion heat in the furnace can cause the change of the steam temperature only through the increase and decrease of the coal amount entering the furnace, namely, the steam temperature has obvious delay when the unit is subjected to load increase and decrease, if the swing angle of a burner is used for tracking the steam temperature simply, the superposition effect of steam temperature delay and swing angle delay can be generated, so that the swing angle adjustment cannot follow the rhythm of the steam temperature change, and the steam temperature fluctuates greatly due to the fact that reverse adjustment is generated at intervals.
In summary, in order to solve the problems of lag and steam temperature fluctuation when the swing angle is adjusted along with the reheat steam temperature, through analysis and experiments, a unit load and coal quantity change signal is introduced as a feedforward signal for automatic swing angle adjustment.
The unit load and coal quantity change signals comprise load reduction adjusting signals, wherein the step of executing the load reduction adjusting signals comprises the following steps of,
a 1: whether the AGC command is smaller than the actual load of 5MW or not, if not, the swing angle of the combustor does not need to be adjusted, and if yes, the step b1 is executed;
b 1: if the accumulated coal reduction amount is smaller than the threshold value, returning to the step a1 if the accumulated coal reduction amount is not smaller than the threshold value, and executing the step c1 if the accumulated coal reduction amount is smaller than the threshold value;
c 1: if the sum of the flow rate of the reduced temperature water at the side of the reheater A, B is smaller than the threshold value, if not, returning to the step a1, and if so, executing the step d 1;
d 1: whether the swinging position of the burner is smaller than minus 6 degrees or not, if not, the swinging angle of the load-reducing coal amount is upward 5 percent, and if so, the swinging angle of the load-reducing coal amount is upward 10 percent;
e 1: and (4) after the swing angle is regulated and controlled, delaying for 20 seconds, and returning to the step (a).
The primary air pressure is firstly used for conveying and drying coal powder in the coal mill, and simultaneously enters the furnace to promote the combustion of the boiler due to the matching of a large amount of oxygen carried by the primary air pressure and secondary air, so that when the primary air pressure changes, on one hand, the concentration changes of the coal powder in the coal mill and the coal powder pipe can be caused to establish a new balance relation, on the other hand, the changes of the coal quantity and the air quantity (oxygen quantity) entering a hearth can be directly caused, the combustion heat of the hearth and the combustion point of the coal powder in the furnace are changed, the combustion intensity is directly influenced, and the change of the central position of flame is caused. Therefore, the change of the primary air pressure is ahead of the change of the steam temperature, and the combustion regulation and control function of the swing angle is further optimized automatically by introducing the primary air pressure change vector into the swing angle of the combustor.
The primary air pressure is not only the increase and decrease change of the air pressure, but also the time point of the air pressure change and the time length after the boiler load change are considered, human factors are considered fully, the primary air pressure is adjusted by manually setting a numerical value at present, the load change has a certain advance amount under normal conditions, if the adjustment is delayed, the concentration of pulverized coal in a powder pipe is increased, even the pulverized coal is accumulated, the coal amount actually entering the boiler after the primary air pressure is adjusted is larger than the coal amount reflected on the boiler surface, and therefore the primary air pressure is selected to be suitable for the initial time period of the actual load change after the load instruction changes in principle.
The primary wind pressure change vector signal comprises a loading manual primary wind pressure adjusting signal, wherein the step of executing the loading manual primary wind pressure adjusting signal comprises the following steps of,
a 2: whether the rise per minute of primary wind pressure is larger than a threshold value or not, if not, the swing angle of the burner does not need to be adjusted, and if so, the step b2 is executed;
b 2: whether the temperature of the steam at the outlets of the superheater A side and the superheater B side rises every minute is larger than a threshold value, if not, returning to the step a2, and if so, executing the step c 2;
c 2: whether the total outlet temperature of the reheater is larger than a threshold value or not, if not, returning to the step a2, and if so, executing the step d 2;
d 2: the primary wind increases the yaw angle by 5%, and then returns to step a 2.
Regular soot blowing is adopted to relieve coking on each heating surface in the combustion process of coal during the operation of a unit, the coking degree of the boiler heating surface in actual operation is usually expressed by the dirt purification degree of each heating surface, and when the dirt purification degree is increased, the temperature of main reheating steam is increased or even an overtemperature phenomenon is caused due to serious hearth coking; how to reasonably adjust the swing angle of the burner to control the steam temperature according to the change of the net pollution degree of each heating surface of the boiler is a difficult point, because the net pollution degree of each heating surface has no direct quantitative value, the net pollution degree of each heating surface and the increase of the desuperheating water volume are positively correlated through on-site actual regulation and test analysis, and the quantity of the desuperheating water can reflect the net pollution degree of each heating surface of the boiler, so that the change of the desuperheating water volume is used for representing the net pollution degree of each heating surface of the boiler, and a good effect is achieved.
The dirty degree of the metal pipe wall of the boiler has great influence on the steam temperature, which is mainly reflected in the temperature and the temperature difference before and after the primary desuperheater, so the change of the parameter is considered in the selection of signals.
The reheater desuperheating water volume limit is mainly used as a long criterion, the comparison relation between the steam temperature and the desuperheating water volume is fully considered, and the long-term existence of the working condition that the desuperheating water volume is too large or the steam temperature is too low is avoided; when the temperature-reducing water quantity signal and the swing angle are matched and adjusted, the temperature difference between the front and the rear of the temperature reducer needs to be fully considered, so that the adjustment is fine adjustment, and the swing angle action needs to be performed in a small range at the stage.
The temperature-reduced water signal comprises a temperature-reduced water flow small adjusting signal, wherein the step of executing the temperature-reduced water flow small adjusting signal comprises the following steps of,
a 3: whether the sum of the flow rates of the attemperation water on the A side and the B side of the reheater is smaller than a threshold value or not is judged, if not, the swing angle of the burner does not need to be adjusted, and if yes, the time is delayed for 3 minutes;
b 3: delaying for 3 minutes, judging whether the temperature of the main steam is less than a threshold value 1, if not, returning to the step a3, and if so, executing a step c3 a; whether the temperature of the reheater is smaller than the threshold value 2, if not, returning to the step a3, and if so, executing the step c3 b;
c3 a: delaying for 3 minutes again, judging whether the temperature of the reheater is smaller than a threshold value 1, if not, returning to the step a3, if so, delaying for 3 minutes and then executing the step d 3;
c3 b: after delaying for another 2 minutes, executing step d 3;
d 3: delaying for 15 minutes after the flow of the temperature-reducing water is less than 5 percent of the open swing angle, and returning to the step a 3.
The regular soot blowing of the boiler is a necessary means for maintaining the stable operation of the boiler, the main reheat steam temperature of the boiler greatly fluctuates along with the programmed action of a soot blowing gun when each heating surface of the boiler blows soot, and the change of the steam temperature is affected when the soot blowing gun blows to different positions. The difference between the length of the boiler and the length of the boiler before and after short blowing and the soot blowing of the tail flue is large, especially when the working condition that the coking is relatively heavy is met, the adjustment range of the swing angle is greatly different from that in normal times, and the influence of the development of the soot blowing is gradually reduced along with the time after the soot blowing is finished. The adjusting of the swing angle of the burner is relatively difficult to increase when the boiler blows soot, and the adjustment of the swing angle of the burner is difficult to hold by a person before the cleanliness of each heating surface is different; in production practice, soot blowing working conditions are set in the swing angle automatic logic through continuous research and adjustment to deal with the particularity of soot blowing of each heating surface, and the swing angle action amplitude is determined according to the influence on the swing angle during soot blowing and the weighting relation coefficient; the establishment of the soot blowing working condition further perfects the automatic control logic of the swing angle, and the effect is good in actual operation.
Executing the soot blowing condition signal includes the steps of,
a 4: whether soot blowing is carried out or not, if not, the swinging angle of the burner does not need to be adjusted, and if so, the step b4 is executed;
b 4: whether the temperature difference between the steam on the A side or the steam on the B side of the reheater is larger than a threshold value or not, if not, returning to the step a4, and if so, executing the step c 4;
c 4: whether the sum of the flow rates of the desuperheating water at the A side and the B side of the reheater is larger than a threshold value or not is judged, if not, the step a4 is returned, and if yes, the step d4 is executed;
d 4: and (4) whether the swing angle position of the burner is larger than minus 6 degrees, if not, closing the swing angle of the temperature-reducing water flow by 5 percent, delaying for 5 minutes, then returning to the step a4, and if so, closing the swing angle of the temperature-reducing water flow by 10 percent, delaying for 5 minutes, and then returning to the step a 4.
When the coal mill is started, larger disturbance of air volume and coal volume can be formed, the weighting ratio of the reheat steam temperature and the dirt purification degree of each heating surface in the swing angle automatic control logic signal is larger when the unit normally operates, and the regulation and control requirements cannot be met if the swing angle of the combustor is controlled according to the conventional signal when the coal mill is started; in the actual production, the disturbances formed by starting the coal mills in different layers are different, wherein part of the coal amount is not counted into the total coal amount when the coal feeder distributes the coal, and statistical data show that the percentage of over-temperature caused by starting the coal mills is up to more than 80%, so that corresponding swing angle automatic logic needs to be customized according to different coal mill starting working conditions, and the combustion stability from the coal feeder before starting to the coal mill after starting is regarded as the range of the coal mill starting working conditions.
The input of the calorific value of the newly started coal mill is accurate, the different influences of wind and coal on the steam temperature are considered in the starting process, the change lead of the wind and the coal are fully considered, and the influence ratio of the selection signal on the swing angle logic is defined according to different coal mills and the current load working condition, because the coal mill is started, short-term severe disturbance is formed, and the corresponding swing angle can play an effective role in the process of starting the coal mill only by accurate and quick action each time; through continuous exploration and research, the swing angle automatic logic caused by the starting working condition of each coal mill is accurately defined, the fluctuation range of the steam temperature and the steam pressure in the process of starting the coal mills is very small, and meanwhile, the overtemperature condition is avoided.
The introduction of the working condition control logic of the swing angle automatic coal mill starting completely breaks through the swing angle automatic logic in the traditional sense, so that the swing angle of the combustor is not simply followed by steam temperature, the problem of frequent action during the swing angle automatic feeding of the combustor is solved, and the unstable combustion of the boiler caused by the starting of the coal mill is avoided. The working condition control logic of the swing angle automatic coal mill starting creates a new idea and an adjusting mode for the combustion adjusting process of the boiler, and the method has high practical value and popularization.
The coal mill working condition signal comprises an E mill adjusting signal, wherein the step of executing the E mill adjusting signal comprises the following steps of,
a 5: closing a coal mill E;
b 5: e, grinding a swing angle of a switch by 10%;
c 5: within 10 minutes of starting the mill, if the opening degrees of the hot and cold primary air regulating valves of the coal mill E are larger than threshold values, executing step d5a, if the coal quantity of the coal mill E reaches 30% of the total output, executing step d5b, and if the coal quantity of the coal mill E reaches 60% of the total output, executing step d5 c;
d5 a: e, grinding a swing angle of a switch to be turned on and off by 5 percent;
d5 b: e, grinding a swing angle of a switch by 10%;
d5 c: e, grinding the starting swing angle by 12 percent.
The logics of the 5 combustion modes of the boiler are connected into the feedforward of the automatic PID of the swing angle, and are quick response to external disturbance; with the 5 modes of rapid adjustment, the PID only plays a role in adjustment under a stable working condition, and the outlet steam temperature of the reheater is taken as a control object; the PID parameter setting is not suitable for too fast response, and the action dead zone set by the field execution mechanism is also properly amplified, so that the swing angle does not swing frequently, the failure rate of equipment is reduced, and the unit parameter is not greatly fluctuated.
The following table is a method for selecting and calculating the burner tilt angle automatic advance control signal:
while there have been shown and described the fundamental principles and principal features of the invention and advantages thereof with reference to the drawings, it will be understood by those skilled in the art that the invention is not limited to the embodiments described above, which are given by way of illustration of the principles of the invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (6)
1. The utility model provides an automatic regulation and control system of thermal power generating unit combustor pivot angle which characterized in that: the method comprises the steps of providing a group load and coal quantity change signal, a primary air pressure change vector signal, a desuperheating water signal, a soot blowing working condition signal, a coal mill working condition signal and a swing angle automatic PID;
the unit load and coal amount change signal can regulate and control the swing angle of the combustor in advance according to the initial change condition of AGC load and coal amount;
the primary wind pressure change vector signal can regulate and control the swing angle of the combustor in advance according to the early steam temperature change in the combustor;
the temperature-reducing water signal can adjust and control the swing angle of the combustor in front according to the front-back temperature difference of the temperature reducer;
the soot blowing working condition signal can regulate and control the swing angle of the combustor according to the degree of dirt purification when soot blowing is carried out on each heating surface under the soot blowing working condition;
the coal mill is started under the working condition, the different influences of wind and coal on the steam temperature are considered, and the change lead of the wind and the coal is fully considered to regulate and control the swing angle of the combustor;
and the automatic PID of the swing angle is in communication connection with a unit load and coal quantity change signal, a primary air pressure change vector signal, a desuperheating water signal, a soot blowing working condition signal and a coal mill working condition signal.
2. The thermal power generating unit combustor pivot angle automatic regulation and control system of claim 1 characterized in that: the unit load and coal quantity change signals comprise load reduction adjusting signals, wherein the step of executing the load reduction adjusting signals comprises the following steps of,
a 1: whether the AGC command is smaller than the actual load of 5MW or not, if not, the swing angle of the combustor does not need to be adjusted, and if yes, the step b1 is executed;
b 1: if the accumulated coal reduction amount is smaller than the threshold value, returning to the step a1 if the accumulated coal reduction amount is not smaller than the threshold value, and executing the step c1 if the accumulated coal reduction amount is smaller than the threshold value;
c 1: if the sum of the flow rate of the reduced temperature water at the side of the reheater A, B is smaller than the threshold value, if not, returning to the step a1, and if so, executing the step d 1;
d 1: whether the swinging position of the burner is smaller than minus 6 degrees or not, if not, the swinging angle of the load-reducing coal amount is upward 5 percent, and if so, the swinging angle of the load-reducing coal amount is upward 10 percent;
e 1: and (4) after the swing angle is regulated and controlled, delaying for 20 seconds, and returning to the step (a).
3. The thermal power generating unit combustor pivot angle automatic regulation and control system of claim 1 characterized in that: the primary wind pressure change vector signal comprises a loading manual primary wind pressure adjusting signal, wherein the step of executing the loading manual primary wind pressure adjusting signal comprises the following steps of,
a 2: whether the rise per minute of primary wind pressure is larger than a threshold value or not, if not, the swing angle of the burner does not need to be adjusted, and if so, the step b2 is executed;
b 2: whether the temperature of the steam at the outlets of the superheater A side and the superheater B side rises every minute is larger than a threshold value, if not, returning to the step a2, and if so, executing the step c 2;
c 2: whether the total outlet temperature of the reheater is larger than a threshold value or not, if not, returning to the step a2, and if so, executing the step d 2;
d 2: the primary wind increases the yaw angle by 5%, and then returns to step a 2.
4. The thermal power generating unit combustor pivot angle automatic regulation and control system of claim 1 characterized in that: the temperature-reduced water signal comprises a temperature-reduced water flow small adjusting signal, wherein the step of executing the temperature-reduced water flow small adjusting signal comprises the following steps of,
a 3: whether the sum of the flow rates of the attemperation water on the A side and the B side of the reheater is smaller than a threshold value or not is judged, if not, the swing angle of the burner does not need to be adjusted, and if yes, the time is delayed for 3 minutes;
b 3: delaying for 3 minutes, judging whether the temperature of the main steam is less than a threshold value 1, if not, returning to the step a3, and if so, executing a step c3 a; whether the temperature of the reheater is smaller than the threshold value 2, if not, returning to the step a3, and if so, executing the step c3 b;
c3 a: delaying for 3 minutes again, judging whether the temperature of the reheater is smaller than a threshold value 1, if not, returning to the step a3, if so, delaying for 3 minutes and then executing the step d 3;
c3 b: after delaying for another 2 minutes, executing step d 3;
d 3: delaying for 15 minutes after the flow of the temperature-reducing water is less than 5 percent of the open swing angle, and returning to the step a 3.
5. The thermal power generating unit combustor pivot angle automatic regulation and control system of claim 1 characterized in that: executing the soot blowing condition signal includes the steps of,
a 4: whether soot blowing is carried out or not, if not, the swinging angle of the burner does not need to be adjusted, and if so, the step b4 is executed;
b 4: whether the temperature difference between the steam on the A side or the steam on the B side of the reheater is larger than a threshold value or not, if not, returning to the step a4, and if so, executing the step c 4;
c 4: whether the sum of the flow rates of the desuperheating water at the A side and the B side of the reheater is larger than a threshold value or not is judged, if not, the step a4 is returned, and if yes, the step d4 is executed;
d 4: and (4) whether the swing angle position of the burner is larger than minus 6 degrees, if not, closing the swing angle of the temperature-reducing water flow by 5 percent, delaying for 5 minutes, then returning to the step a4, and if so, closing the swing angle of the temperature-reducing water flow by 10 percent, delaying for 5 minutes, and then returning to the step a 4.
6. The thermal power generating unit combustor pivot angle automatic regulation and control system of claim 1 characterized in that: the coal mill working condition signal comprises an E mill adjusting signal, wherein the step of executing the E mill adjusting signal comprises the following steps of,
a 5: closing a coal mill E;
b 5: e, grinding a swing angle of a switch by 10%;
c 5: within 10 minutes of starting the mill, if the opening degrees of the hot and cold primary air regulating valves of the coal mill E are larger than threshold values, executing step d5a, if the coal quantity of the coal mill E reaches 30% of the total output, executing step d5b, and if the coal quantity of the coal mill E reaches 60% of the total output, executing step d5 c;
d5 a: e, grinding a swing angle of a switch to be turned on and off by 5 percent;
d5 b: e, grinding a swing angle of a switch by 10%;
d5 c: e, grinding the starting swing angle by 12 percent.
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