CN112082142A - Boiler intelligent coordination system and method for coal-fired unit of power plant - Google Patents

Boiler intelligent coordination system and method for coal-fired unit of power plant Download PDF

Info

Publication number
CN112082142A
CN112082142A CN202010834476.0A CN202010834476A CN112082142A CN 112082142 A CN112082142 A CN 112082142A CN 202010834476 A CN202010834476 A CN 202010834476A CN 112082142 A CN112082142 A CN 112082142A
Authority
CN
China
Prior art keywords
pressure
boiler
value
coal
time point
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN202010834476.0A
Other languages
Chinese (zh)
Other versions
CN112082142B (en
Inventor
王凤雷
时春
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Jiangsu Future Wisdom Information Technology Co ltd
Original Assignee
Jiangsu Future Wisdom Information Technology Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Jiangsu Future Wisdom Information Technology Co ltd filed Critical Jiangsu Future Wisdom Information Technology Co ltd
Priority to CN202010834476.0A priority Critical patent/CN112082142B/en
Publication of CN112082142A publication Critical patent/CN112082142A/en
Application granted granted Critical
Publication of CN112082142B publication Critical patent/CN112082142B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B35/00—Control systems for steam boilers
    • F22B35/18—Applications of computers to steam boiler control

Abstract

A boiler intelligent coordination system and method for a coal-fired unit of a power plant comprises a pressure sensor for sampling the pressure value of the steam pressure at the outlet of a boiler and transmitting the pressure value of the steam pressure at the outlet of the boiler to a DCS controller, wherein the pressure value of the steam pressure at the outlet of the boiler sampled by the pressure sensor is { V }1,W1}、{V2,W2}、…、{Vr‑1,Wr‑1}、{Vr,WrBy means of equation (1) estimating the pressure sensor at point Vr+1Pressure value W of boiler outlet steam pressurer+1. The method effectively avoids the defects that the mean value estimation method of the previous pressure value of the main steam pressure of the boiler of the coal-fired power generating set in the prior art is constant, the correction performance is poor, and the estimation accuracy is poor in the main steam pressure detection of the boiler of the coal-fired power generating set.

Description

Boiler intelligent coordination system and method for coal-fired unit of power plant
Technical Field
The invention belongs to the technical field of boiler control of power plant coal-fired units, and particularly relates to an intelligent boiler coordination system and method for a power plant coal-fired unit.
Background
A thermal power plant, referred to as a power plant, is a plant that produces electric energy using combustible materials (e.g., coal) as fuel. The basic production process is as follows: when the fuel is burnt, water is heated to generate steam, chemical energy of the fuel is converted into heat energy, the steam pressure pushes a steam turbine to rotate, the heat energy is converted into mechanical energy, and then the steam turbine drives a generator to rotate, so that the mechanical energy is converted into electric energy. The coal-fired power generating unit in the power plant mainly comprises a combustion system (taking a boiler as a core), a steam-water system (mainly comprising various pumps, a feed water heater, a condenser, a pipeline, a water wall and the like), an electric system (mainly comprising a turbine generator, a main transformer and the like), a control system and the like. The former two generate high-temperature high-pressure steam; the electrical system realizes the conversion from heat energy, mechanical energy to electric energy; the control system ensures that each system is operated safely, reasonably and economically.
In the boiler main control loop of the coal-fired power generating set, the change of future main steam pressure is estimated by utilizing an estimation technology according to the previous pressure value of the current main steam pressure, the estimated value of the future main steam pressure is introduced into the current main steam pressure regulation, the output of a reasonable coal supply requirement value is realized, and the main steam pressure is not overshot when the load of the power generating set is lifted; the coal supply system of the boiler is controlled to supply the amount of coal required by the boiler to the boiler. Existing estimation methods include the commonly used mean value estimation method of previous pressure values of the current main steam pressure. However, the estimation methods are accompanied by the defects of poor self-correction performance in a constant manner, and the estimation methods are invariable and cannot perform correction accompanied by the fluctuation performance of the previous pressure value of the main steam pressure; therefore, the current mean value estimation method of the previous pressure value of the main steam pressure has the defect of poor estimation accuracy in the main steam pressure detection of the boiler of the coal-fired power generating unit.
Disclosure of Invention
In order to solve the problems, the invention provides an intelligent coordination system and method for a boiler of a coal-fired power plant unit, which effectively overcome the defects that in the prior art, an average value estimation method of the previous pressure values of the main steam pressure of the boiler of the coal-fired power plant unit is constant, the correction performance of the boiler is poor, and the estimation accuracy is poor in the main steam pressure detection of the boiler of the coal-fired power plant unit.
In order to overcome the defects in the prior art, the invention provides a solution for an intelligent boiler coordination system and method of a coal-fired unit of a power plant, which comprises the following specific steps:
a boiler wisdom coordination system to coal fired unit of power plant, it includes: the system comprises a pressure sensor, a data processing unit and a data processing unit, wherein the pressure sensor is arranged at a boiler steam outlet of a boiler of a coal-fired unit of a power plant and is used for detecting the steam pressure at the boiler outlet, the output end of the pressure sensor is electrically connected with the input end of a DCS (distributed control system) controller, and a port of the DCS controller is connected with an upper computer;
the DCS controller is connected with the coal feeding system of the boiler in a control mode and is used for enabling the coal feeding system of the boiler to control the coal feeding amount of the boiler of the coal-fired unit of the power plant.
Furthermore, P pressure sensors are arranged at a boiler steam outlet of a boiler of the coal-fired unit of the power plant in a vertical direction.
A method for a boiler intelligent coordination system of a coal-fired unit of a power plant comprises the following steps:
s1-1: the pressure sensor samples the pressure value of the boiler outlet steam pressure and transmits the pressure value of the boiler outlet steam pressure to the DCS controller, and the pressure value of the boiler outlet steam pressure sampled by the pressure sensor is { V }1,W1}、{V2,W2}、…、{Vr-1,Wr-1}、{Vr,Wr}；
VsAnd WsEach refers to the sampling time point and the pressure number of the pressure value of the steam pressure at the outlet of the boiler at the s-th time of the pressure sensor; s is an integer value from 1 to r, r being a positive integer; v1,、V2、…、Vr-1、VrSequentially arranging according to the sequence from small to large;
furthermore, the interval between the random adjacent time points of the pressure value of the sampling boiler outlet steam pressure of the pressure sensor can be randomly set.
S1-2: estimating the pressure sensor at point V by means of equation (1)r+1Pressure value W of boiler outlet steam pressurer+1；
Wr+1＝d1o1Wr-2+d2o2Wr-1+d3o3Wr (1)
Here, o1、o2And o3Respectively for the time point Vr-2、Vr-1And VrAt the time point V of the improved polynomial basis functionr+1Numerical value of (d)1、d2And d3Is a correction parameter, where, further, said o1、o2And o3As shown in equations (2), (3) and (4), respectively:
o1＝{{Vr+1-Vr-1}*{Vr+1-Vr}}/{{Vr-2-Vr-1}*{Vr-2-Vr}} (2)
o2＝{{Vr+1-Vr-2}*{Vr+1-Vr}}/{{Vr-1-Vr-2}*{Vr-1-Vr}} (3)
o3＝{{Vr+1-Vr-2}*{Vr+1-Vr-1}}/{{Vr-Vr-2}*{Vr-Vr-1}} (4)
d is1、d2And d3As shown in equation (5):
Figure BDA0002639185850000031
o11、o12and o13Each for a time point Vi-3,Vi-2And Vi-1At the time point V of the improved polynomial basis functioniFunction value of o21、o22And o23Each for a time point Vi-4,Vi-3And Vi-2At the time point V of the improved polynomial basis functioni-1The function value of (a); o31、o32And o33Are each directed against Vi-5,Vi-4And Vi-3At the time point V of the improved polynomial basis functioni-2The function value of (1).
From equation (1), Wr+1The derivation method does not directly use the existing polynomial basis function to perform extrapolation estimation Vi+1The pressure values of the boiler outlet steam pressure at the time points are each for the time point Vr-2、Vr-1And VrAt the time point V of the improved polynomial basis functionr+1Value o of1、o2And o3Are corrected in time.
A method for a boiler intelligent coordination system of a coal-fired unit of a power plant comprises the following steps:
s2-1: the pressure sensor samples the pressure value of the boiler outlet steam pressure and transmits the pressure value of the boiler outlet steam pressure to the DCS controller, and the pressure value of the boiler outlet steam pressure sampled by the pressure sensor is { V }1,W1}、{V2,W2}、…、{Vr-1,Wr-1}、{Vr,Wr}；
VsAnd WsEach refers to the sampling time point and the pressure number of the pressure value of the steam pressure at the outlet of the boiler at the s-th time of the pressure sensor; s is an integer value from 1 to r, r being a positive integer; v1,、V2、…、Vr-1、VrSequentially arranging according to the sequence from small to large;
furthermore, the interval between the random adjacent time points of the pressure value of the sampling boiler outlet steam pressure of the pressure sensor can be randomly set.
S2-2: the pressure sensor is estimated at point V by equation (6)r+1Pressure value W of boiler outlet steam pressurer+1；
Wr+1＝d1o1Wr-3+d2o2Wr-2+d3o3Wr-1+d3o3Wr (6)
Here, o1、o2、o3And o4Respectively for the time point Vr-3、Vr-2、Vr-1And VrAt the time point V of the improved polynomial basis functionr+1Numerical value of (d)1、d2、d3And d4Is a correction parameter, where, further, said o1、o2、o3And o4Respectively as equation (7), equation (8) and squareEquation (9) and equation (10) show:
o1＝{{Vr+1-Vr-2}*{Vr+1-Vr-1}*{Vr+1-Vr}}/{{Vr-3-Vr-2}*{Vr-23-Vr-1}*{Vr-3-Vr}}(7)
o2＝{{Vr+1-Vr-3}*{Vr+1-Vr-1}*{Vr+1-Vr}}/{{Vr-2-Vr-3}*{Vr-23-Vr-1}*{Vr-2-Vr}}(8)
o3＝{{Vr+1-Vr-3}*{Vr+1-Vr-2}*{Vr+1-Vr}}/{{Vr-1-Vr-3}*{Vr-13-Vr-1}*{Vr-1-Vr}}(9)
o4＝{{Vr+1-Vr-3}*{Vr+1-Vr-2}*{Vr+1-Vr-1}}/{{Vr-Vr-3}*{Vr-Vr-2}*{Vr-Vr-1}}(10)
d is1、d2、d3And d4As shown in equation (11):
Figure BDA0002639185850000041
o11、o12、o13and o14Each for a time point Vi-4、Vi-3、Vi-2And Vi-1At the time point V of the improved polynomial basis functioniFunction value of o21、o22、o23And o24Each for a time point Vi-5,Vi-4,Vi-3And Vi-2At the time point V of the improved polynomial basis functioni-1The function value of (a); o31、o32、o33And o34Are each directed against Vi-6,Vi-5,Vi-4And Vi-3At the time point V of the improved polynomial basis functioni-3The function value of (a); o41、o42、o43And o44Are each directed against Vi-7,Vi-6,Vi-5And Vi-4At the time point V of the improved polynomial basis functioni-4The function value of (1).
Aiming at different M existing time points V1,V2,V3,…,VLIntermediate value S corresponding to the time point1,S2,S3,…,SLThe improved polynomial basis function can be constructed to calculate the corresponding intermediate value S (V) of the random time point V, and the equation is the following equation (12):
Figure BDA0002639185850000051
where j is an integer value from 1 to L, U in equation (12)j(V) as the improved polynomial basis function corresponding to the jth time point, is shown in equation (13):
Figure BDA0002639185850000052
for two pairs of timepoints V1,V2,V3And V4Two corresponding pairs of modified polynomial basis functions can be constructed as shown in equations (14) -17, respectively:
Figure BDA0002639185850000053
Figure BDA0002639185850000054
Figure BDA0002639185850000055
Figure BDA0002639185850000061
and said o11、o12、o13And o14Each for a time point Vi-4、Vi-3、Vi-2And Vi-1At the time point V of the improved polynomial basis functioniFunction value of (a) must let V＝Vj、Y1＝Vj-4、Y2＝Vj-3、Y3＝＝Vj-2、Y4＝＝Vj-1It can be deduced as shown in equations (18) -21:
Figure BDA0002639185850000062
Figure BDA0002639185850000063
Figure BDA0002639185850000064
Figure BDA0002639185850000065
furthermore, under the condition that P pressure sensors are vertically arranged at the boiler steam outlet of the boiler of the coal-fired unit of the power plant, the pressure value of the boiler outlet steam pressure sampled by the pressure sensors is determined to be VrThe highest data Z1 and the lowest data Z2 of pressure values of the boiler outlet steam pressure sampled by the P pressure sensors at the time point, and the interval size A1 between the pressure sensors sampling the pressure values of the highest data Z1 and the lowest data Z2; the method for estimating the point V at the time by applying the boiler intelligent coordination system aiming at the coal-fired unit of the power plantr+1Pressure value W of boiler outlet steam pressurer+1Also identified is a pressure value W of the estimated boiler outlet steam pressurer+1Highest data Q1 and lowest dataAccording to Q2, and the pressure value W of the estimated boiler outlet steam pressurer+1The pressure value of the highest data Q1 and the lowest data Q2 corresponds to the interval size a2 between the pressure sensors, and is then determined by the following equation (22):
{ Q1-Q2}/a2> { Z1-Z2}/a1> -I (22), which is the normal value of the pressure value of the set boiler outlet steam pressure.
If the condition of equation (22) is satisfied, the DCS controller determines that the pressure of the steam at the outlet of the boiler is too high as the main steam pressure, and if the condition of equation (22) is not satisfied, the DCS controller determines that the pressure of the steam at the outlet of the boiler is proper as the main steam pressure, and the coal supply system of the boiler continues to supply the coal to the boiler of the coal-fired unit of the power plant.
The invention has the beneficial effects that:
the estimation method according to the time sequence given by the method for the intelligent boiler coordination system of the power plant coal-fired unit is suitable for estimation in the time interval of the time sequence at different time intervals and in the range of random time; the pressure value estimation of the boiler outlet steam pressure can be achieved only by using few pressure values of the former boiler outlet steam pressure beside the estimation point, the method is not complex and tedious in operation, corresponding software is not difficult to develop, and the estimation operation amount of each time is not large, so that the estimation performance and speed can be greatly improved; the method for the intelligent boiler coordination system of the power plant coal-fired unit has the advantages of correction, along with the fluctuation of the pressure value of the steam pressure at the outlet of the boiler, and the parameter dxAnd refreshing in time, wherein the subscript z is a positive integer, and all parameters of the current algorithm for estimating the pressure value of the boiler outlet steam pressure are generally constant values, so that compared with the prior art, the method for the intelligent boiler coordination system of the power plant coal-fired unit is closer to the actually detected value, and is suitable for performing efficient control on the pressure value of the boiler outlet steam pressure so as to reduce the pressure value error of the boiler outlet steam pressure. For pressure determination, the pressure of the steam at the outlet of the boiler is usedWhen the pressure value drop of the boiler outlet steam pressure corresponding to the pressure value of the boiler outlet steam pressure of a plurality of pressure sensors at a certain measuring point at the last time is higher than a set normal value T, and the pressure value of the boiler outlet steam pressure estimated at the later time is also heightened, the boiler outlet steam pressure serving as the main steam pressure is considered to be too high, and the DCS controller enables a coal feeding system of the boiler to stop supplying coal to the boiler of the coal-fired unit of the power plant; by applying the secondary determination, the pressure value of the steam pressure at the outlet of the boiler can meet the requirement, the fall of the pressure value of the steam pressure at the outlet of the boiler is reduced, and the cost of pressure coordination of the steam pressure at the outlet of the boiler can be synchronously reduced.
Drawings
FIG. 1 is an overall schematic diagram of an intelligent boiler coordination system for a coal-fired unit of a power plant according to the present invention.
FIG. 2 is a partial flow chart of the method of the invention for the boiler intelligent coordination system of the coal-fired unit of the power plant.
Detailed Description
The invention will be further described with reference to the following figures and examples.
As shown in fig. 1-2, an intelligent coordination system for a boiler of a coal-fired unit of a power plant includes: the system comprises a pressure sensor, a data processing unit and a data processing unit, wherein the pressure sensor is arranged at a boiler steam outlet of a boiler of a coal-fired unit of a power plant and is used for detecting the steam pressure at the boiler outlet, the output end of the pressure sensor is electrically connected with the input end of a DCS (distributed control system) controller, and a port of the DCS controller is connected with an upper computer;
the DCS controller is connected with the coal feeding system of the boiler in a control mode and is used for enabling the coal feeding system of the boiler to control the coal feeding amount of the boiler of the coal-fired unit of the power plant.
P pressure sensors are arranged at a boiler steam outlet of a boiler of the coal-fired unit of the power plant in a vertical direction.
A method for a boiler intelligent coordination system of a coal-fired unit of a power plant comprises the following steps:
s1-1: the pressure sensor samples a pressure value of boiler outlet steam pressure, and transmits the pressure value of boiler outlet steam pressure to the DCS controller, wherein the pressure value of boiler outlet steam pressure sampled by one pressure sensor is { V }1,W1}、{V2,W2}、…、{Vr-1,Wr-1}、{Vr,Wr}；
VsAnd WsEach refers to the sampling time point and the pressure number of the pressure value of the steam pressure at the outlet of the boiler at the s-th time of the pressure sensor; s is an integer value from 1 to r, r being a positive integer; v1,、V2、…、Vr-1、VrSequentially arranging according to the sequence from small to large;
the pressure sensor is arranged in a boiler main control loop of the coal-fired power generating set, the pressure sensor is arranged, the future change of main steam pressure can be estimated by utilizing an estimation technology according to the current previous pressure value of the boiler outlet steam pressure serving as the main steam pressure, the future estimated value of the main steam pressure is introduced into the current main steam pressure regulation, the reasonable coal supply quantity required value output is realized, and the main steam pressure is not overshot when the power generating set is subjected to load lifting.
The interval between the random adjacent time points of the pressure value of the sampling boiler outlet steam pressure of the pressure sensor in the invention can be randomly set without making the time duration of the interval period the same, so that the problem of being not beneficial to estimation still can not occur under the condition that the pressure value of the boiler outlet steam pressure at a time point is omitted due to the interference of the pressure value transmission of the boiler outlet steam pressure.
S1-2: estimating the pressure sensor at point V by means of equation (1)r+1Pressure value W of boiler outlet steam pressurer+1；
Wr+1＝d1o1Wr-2+d2o2Wr-1+d3o3Wr (1)
Here, o1、o2And o3Respectively for the time point Vr-2、Vr-1And VrAt the time point V of the improved polynomial basis functionr+1Numerical value of (d)1、d2And d3Is a correction parameter, here, o1、o2And o3As shown in equations (2), (3) and (4), respectively:
o1＝{{Vr+1-Vr-1}*{Vr+1-Vr}}/{{Vr-2-Vr-1}*{Vr-2-Vr}} (2)
o2＝{{Vr+1-Vr-2}*{Vr+1-Vr}}/{{Vr-1-Vr-2}*{Vr-1-Vr}} (3)
o3＝{{Vr+1-Vr-2}*{Vr+1-Vr-1}}/{{Vr-Vr-2}*{Vr-Vr-1}} (4)
d is1、d2And d3As shown in equation (5):
Figure BDA0002639185850000101
o11、o12and o13Each for a time point Vi-3,Vi-2And Vi-1At the time point V of the improved polynomial basis functioniFunction value of o21、o22And o23Each for a time point Vi-4,Vi-3And Vi-2At the time point V of the improved polynomial basis functioni-1The function value of (a); o31、o32And o33Are each directed against Vi-5,Vi-4And Vi-3At the time point V of the improved polynomial basis functioni-2The function value of (1).
From equation (1), Wr+1The derivation method does not directly use the existing polynomial basis function to perform extrapolation estimation Vi+1The pressure values of the boiler outlet steam pressure at the time points are each for the time point Vr-2、Vr-1And VrAt the time point V of the improved polynomial basis functionr+1Value o of1、o2And o3Are corrected in time.
This has the following advantages:
the estimation method according to the time sequence given by the method aiming at the boiler intelligent coordination system of the power plant coal-fired unit is suitable for estimation in the time interval of the time sequence with different time intervals and can also perform estimation in the scope of random time intervals;
secondly, the pressure value of the steam pressure at the outlet of the boiler can be estimated by only using few pressure values of the steam pressure at the outlet of the boiler at the previous time beside the estimation point, the method is not complex and tedious to operate, corresponding software is not difficult to develop, and the estimation operation amount of each time is not large, so that the estimation performance and speed can be greatly improved;
thirdly, the method for the boiler intelligent coordination system of the coal-fired unit of the power plant corrects the advantages of the method, and specifically detects the fluctuation of the pressure value of the steam pressure at the outlet of the boiler and the parameter dxAnd refreshing in time, wherein the subscript z is a positive integer, and all parameters of the current algorithm for estimating the pressure value of the boiler outlet steam pressure are generally constant values, so that compared with the prior art, the method for the intelligent boiler coordination system of the power plant coal-fired unit is closer to the actually detected value, and is suitable for performing efficient control on the pressure value of the boiler outlet steam pressure so as to reduce the pressure value error of the boiler outlet steam pressure.
A method for a boiler intelligent coordination system of a coal-fired unit of a power plant comprises the following steps:
s2-1: the pressure sensor samples a pressure value of boiler outlet steam pressure, and transmits the pressure value of boiler outlet steam pressure to the DCS controller, wherein the pressure value of boiler outlet steam pressure sampled by one pressure sensor is { V }1,W1}、{V2,W2}、…、{Vr-1,Wr-1}、{Vr,Wr}；
VsAnd WsEach refer to the s-th of the pressure sensorSampling time points and pressure numbers of the pressure value of the steam pressure at the outlet of the secondary boiler; s is an integer value from 1 to r, r being a positive integer; v1,、V2、…、Vr-1、VrSequentially arranging according to the sequence from small to large;
the pressure sensor is arranged in a boiler main control loop of the coal-fired power generating set, the pressure sensor is arranged, the future change of main steam pressure can be estimated by utilizing an estimation technology according to the current previous pressure value of the boiler outlet steam pressure serving as the main steam pressure, the future estimated value of the main steam pressure is introduced into the current main steam pressure regulation, the reasonable coal supply quantity required value output is realized, and the main steam pressure is not overshot when the power generating set is subjected to load lifting.
The interval between the random adjacent time points of the pressure value of the sampling boiler outlet steam pressure of the pressure sensor in the invention can be randomly set without making the time duration of the interval period the same, so that the problem of being not beneficial to estimation still can not occur under the condition that the pressure value of the boiler outlet steam pressure at a time point is omitted due to the interference of the pressure value transmission of the boiler outlet steam pressure.
S2-2: the pressure sensor is estimated at point V by equation (6)r+1Pressure value W of boiler outlet steam pressurer+1；
Wr+1＝d1o1Wr-3+d2o2Wr-2+d3o3Wr-1+d3o3Wr (6)
Here, o1、o2、o3And o4Respectively for the time point Vr-3、Vr-2、Vr-1And VrAt the time point V of the improved polynomial basis functionr+1Numerical value of (d)1、d2、d3And d4Is a correction parameter, here, o1、o2、o3And o4As shown in equations (7), (8), (9) and (10), respectively:
o1＝{{Vr+1-Vr-2}*{Vr+1-Vr-1}*{Vr+1-Vr}}/{{Vr-3-Vr-2}*{Vr-23-Vr-1}*{Vr-3-Vr}} (7)
o2＝{{Vr+1-Vr-3}*{Vr+1-Vr-1}*{Vr+1-Vr}}/{{Vr-2-Vr-3}*{Vr-23-Vr-1}*{Vr-2-Vr}} (8)
o3＝{{Vr+1-Vr-3}*{Vr+1-Vr-2}*{Vr+1-Vr}}/{{Vr-1-Vr-3}*{Vr-13-Vr-1}*{Vr-1-Vr}} (9)
o4＝{{Vr+1-Vr-3}*{Vr+1-Vr-2}*{Vr+1-Vr-1}}/{{Vr-Vr-3}*{Vr-Vr-2}*{Vr-Vr-1}} (10)
d is1、d2、d3And d4As shown in equation (11):
Figure BDA0002639185850000121
o11、o12、o13and o14Each for a time point Vi-4、Vi-3、Vi-2And Vi-1At the time point V of the improved polynomial basis functioniFunction value of o21、o22、o23And o24Each for a time point Vi-5,Vi-4,Vi-3And Vi-2At the time point V of the improved polynomial basis functioni-1The function value of (a); o31、o32、o33And o34Are each directed against Vi-6,Vi-5,Vi-4And Vi-3At the time point V of the improved polynomial basis functioni-3The function value of (a); o41、o42、o43And o44Are each directed against Vi-7,Vi-6,Vi-5And Vi-4At the time point V of the improved polynomial basis functioni-4The function value of (1).
Aiming at different M existing time points V1,V2,V3,…,VLIntermediate value S corresponding to the time point1,S2,S3,…,SLThe improved polynomial basis function can be constructed to calculate the corresponding intermediate value S (V) of the random time point V, and the equation is the following equation (12):
Figure BDA0002639185850000122
where j is an integer value from 1 to L, U in equation (12)j(V) as the improved polynomial basis function corresponding to the jth time point, is shown in equation (13):
Figure BDA0002639185850000131
for two pairs of timepoints V1,V2,V3And V4Two corresponding pairs of modified polynomial basis functions can be constructed as shown in equations (14) -17, respectively:
Figure BDA0002639185850000132
Figure BDA0002639185850000133
Figure BDA0002639185850000134
Figure BDA0002639185850000135
and said o11、o12、o13And o14Each for a time point Vi-4、Vi-3、Vi-2And Vi-1At the time point V of the improved polynomial basis functioniFunction value of (a) must let V＝Vj、Y1＝Vj-4、Y2＝Vj-3、Y3＝＝Vj-2、Y4＝＝Vj-1It can be deduced as shown in equations (18) -21:
Figure BDA0002639185850000136
Figure BDA0002639185850000137
Figure BDA0002639185850000138
Figure BDA0002639185850000139
。
under the condition that P pressure sensors are vertically arranged at the boiler steam outlet of the boiler of the coal-fired unit of the power plant, the pressure value of the boiler outlet steam pressure sampled by the pressure sensors is determined to be VrThe highest data Z1 and the lowest data Z2 of pressure values of the boiler outlet steam pressure sampled by the P pressure sensors at the time point, and the interval size A1 between the pressure sensors sampling the pressure values of the highest data Z1 and the lowest data Z2; the method for estimating the point V at the time by applying the boiler intelligent coordination system aiming at the coal-fired unit of the power plantr+1Pressure value W of boiler outlet steam pressurer+1Also identified is a pressure value W of the estimated boiler outlet steam pressurer+1The highest data Q1 and the lowest data Q2, and the pressure value W of the estimated boiler outlet steam pressurer+1Is the most important ofThe pressure sensor spacing A2 between the pressure values of the high data Q1 and the lowest data Q2 is then determined by the following equation (22):
{ Q1-Q2}/a2> { Z1-Z2}/a1> -I (22), which is the normal value for the pressure value of the boiler outlet steam pressure, as can be chosen as 20 MPA.
If the condition of equation (22) is satisfied, the DCS controller determines that the pressure of the steam at the outlet of the boiler is too high as the main steam pressure, and if the condition of equation (22) is not satisfied, the DCS controller determines that the pressure of the steam at the outlet of the boiler is proper as the main steam pressure, and the coal supply system of the boiler continues to supply the coal to the boiler of the coal-fired unit of the power plant.
When the pressure value drop of the boiler outlet steam pressure corresponding to the pressure value of the boiler outlet steam pressure of a plurality of pressure sensors at a certain measuring point is higher than a set normal value T and the pressure value of the boiler outlet steam pressure corresponding to the pressure value of the boiler outlet steam pressure at the latest time is also increased at the later time, the boiler outlet steam pressure serving as the main steam pressure is considered to be too high, and the DCS controller enables a coal feeding system of the boiler to stop supplying coal to the boiler of the coal-fired unit of the power plant; by applying the secondary determination, the pressure value of the steam pressure at the outlet of the boiler can meet the requirement, the fall of the pressure value of the steam pressure at the outlet of the boiler is reduced, and the cost of pressure coordination of the steam pressure at the outlet of the boiler can be synchronously reduced.
The present invention has been described in an illustrative manner by the embodiments, and it should be understood by those skilled in the art that the present disclosure is not limited to the embodiments described above, but is capable of various changes, modifications and substitutions without departing from the scope of the present invention.

Claims (8)

1. The utility model provides a boiler wisdom coordinated system to coal-fired unit of power plant which characterized in that includes: the system comprises a pressure sensor, a data processing unit and a data processing unit, wherein the pressure sensor is arranged at a boiler steam outlet of a boiler of a coal-fired unit of a power plant and is used for detecting the steam pressure at the boiler outlet, the output end of the pressure sensor is electrically connected with the input end of a DCS (distributed control system) controller, and a port of the DCS controller is connected with an upper computer;
the DCS controller is connected with the coal feeding system of the boiler in a control mode and is used for enabling the coal feeding system of the boiler to control the coal feeding amount of the boiler of the coal-fired unit of the power plant.
2. The system of claim 1, comprising: p pressure sensors are arranged at a boiler steam outlet of a boiler of the coal-fired unit of the power plant in a vertical direction.
3. A method for a boiler intelligent coordination system of a coal-fired unit of a power plant is characterized by comprising the following steps:
s1-1: the pressure sensor samples the pressure value of the boiler outlet steam pressure and transmits the pressure value of the boiler outlet steam pressure to the DCS controller, and the pressure value of the boiler outlet steam pressure sampled by the pressure sensor is { V }1,W1}、{V2,W2}、…、{Vr-1,Wr-1}、{Vr,Wr}；
VsAnd WsEach refers to the sampling time point and the pressure number of the pressure value of the steam pressure at the outlet of the boiler at the s-th time of the pressure sensor; s is an integer value from 1 to r, r being a positive integer; v1,、V2、…、Vr-1、VrSequentially arranging according to the sequence from small to large;
s1-2: estimating the pressure sensor at point V by means of equation (1)r+1Pressure value W of boiler outlet steam pressurer+1；
Wr+1＝d1o1Wr-2+d2o2Wr-1+d3o3Wr (1)
Here, o1、o2And o3Respectively for the time point Vr-2、Vr-1And VrAt the time point V of the improved polynomial basis functionr+1Numerical value of (d)1、d2And d3Is a correction parameter, where, further, said o1、o2And o3As shown in equations (2), (3) and (4), respectively:
o1＝{{Vr+1-Vr-1}*{Vr+1-Vr}}/{{Vr-2-Vr-1}*{Vr-2-Vr}} (2)
o2＝{{Vr+1-Vr-2}*{Vr+1-Vr}}/{{Vr-1-Vr-2}*{Vr-1-Vr}} (3)
o3＝{{Vr+1-Vr-2}*{Vr+1-Vr-1}}/{{Vr-Vr-2}*{Vr-Vr-1}} (4)
d is1、d2And d3As shown in equation (5):
Figure FDA0002639185840000021
o11、o12and o13Each for a time point Vi-3,Vi-2And Vi-1At the time point V of the improved polynomial basis functioniFunction value of o21、o22And o23Each for a time point Vi-4,Vi-3And Vi-2At the time point V of the improved polynomial basis functioni-1The function value of (a); o31、o32And o33Are each directed against Vi-5,Vi-4And Vi-3At the time point V of the improved polynomial basis functioni-2The function value of (1).
4. The method for the intelligent boiler coordination system of a coal-fired unit of a power plant as claimed in claim 3, wherein the interval between the random adjacent time points of the pressure value of the sampled boiler outlet steam pressure of one of said pressure sensors is set randomly.
5. A method for a boiler intelligent coordination system of a coal-fired unit of a power plant is characterized by comprising the following steps:
s2-1: the pressure sensor samples the pressure value of the boiler outlet steam pressure and transmits the pressure value of the boiler outlet steam pressure to the DCS controller, and the pressure value of the boiler outlet steam pressure sampled by the pressure sensor is { V }1,W1}、{V2,W2}、…、{Vr-1,Wr-1}、{Vr,Wr}；
VsAnd WsEach refers to the sampling time point and the pressure number of the pressure value of the steam pressure at the outlet of the boiler at the s-th time of the pressure sensor; s is an integer value from 1 to r, r being a positive integer; v1,、V2、…、Vr-1、VrSequentially arranging according to the sequence from small to large;
s2-2: the pressure sensor is estimated at point V by equation (6)r+1Pressure value W of boiler outlet steam pressurer+1；
Wr+1＝d1o1Wr-3+d2o2Wr-2+d3o3Wr-1+d3o3Wr (6)
Here, o1、o2、o3And o4Respectively for the time point Vr-3、Vr-2、Vr-1And VrAt the time point V of the improved polynomial basis functionr+1Numerical value of (d)1、d2、d3And d4Is a correction parameter, where, further, said o1、o2、o3And o4As shown in equations (7), (8), (9) and (10), respectively:
o1＝{{Vr+1-Vr-2}*{Vr+1-Vr-1}*{Vr+1-Vr}}/{{Vr-3-Vr-2}*{Vr-23-Vr-1}*{Vr-3-Vr}} (7)
o2＝{{Vr+1-Vr-3}*{Vr+1-Vr-1}*{Vr+1-Vr}}/{{Vr-2-Vr-3}*{Vr-23-Vr-1}*{Vr-2-Vr}} (8)
o3＝{{Vr+1-Vr-3}*{Vr+1-Vr-2}*{Vr+1-Vr}}/{{Vr-1-Vr-3}*{Vr-13-Vr-1}*{Vr-1-Vr}} (9)
o4＝{{Vr+1-Vr-3}*{Vr+1-Vr-2}*{Vr+1-Vr-1}}/{{Vr-Vr-3}*{Vr-Vr-2}*{Vr-Vr-1}} (10)
d is1、d2、d3And d4As shown in equation (11):
Figure FDA0002639185840000031
o11、o12、o13and o14Each for a time point Vi-4、Vi-3、Vi-2And Vi-1At the time point V of the improved polynomial basis functioniFunction value of o21、o22、o23And o24Each for a time point Vi-5,Vi-4,Vi-3And Vi-2At the time point V of the improved polynomial basis functioni-1The function value of (a); o31、o32、o33And o34Are each directed against Vi-6,Vi-5,Vi-4And Vi-3At the time point V of the improved polynomial basis functioni-3The function value of (a); o41、o42、o43And o44Are each directed against Vi-7,Vi-6,Vi-5And Vi-4At the time point V of the improved polynomial basis functioni-4The function value of (1).
6. The method for the intelligent boiler coordination system of a coal-fired unit of power plant as claimed in claim 5, wherein said method is applied to different M existing time points V1,V2,V3,…,VLIntermediate value S corresponding to the time point1,S2,S3,…,SLThe improved polynomial basis function can be constructed to calculate the corresponding intermediate value S (V) of the random time point V, and the equation is the following equation (12):
Figure FDA0002639185840000041
where j is an integer value from 1 to L, U in equation (12)j(V) as the improved polynomial basis function corresponding to the jth time point, is shown in equation (13):
Figure FDA0002639185840000042
for two pairs of timepoints V1,V2,V3And V4Two corresponding pairs of modified polynomial basis functions can be constructed as shown in equations (14) -17, respectively:
Figure FDA0002639185840000043
Figure FDA0002639185840000044
Figure FDA0002639185840000045
Figure FDA0002639185840000046
and said o11、o12、o13And o14Each for a time point Vi-4、Vi-3、Vi-2And Vi-1At the time point V of the improved polynomial basis functioniThe function value of (A) must be such that V is equal to Vj、Y1＝Vj-4、Y2＝Vj-3、Y3＝＝Vj-2、Y4＝＝Vj-1It can be deduced as shown in equations (18) -21:
Figure FDA0002639185840000047
Figure FDA0002639185840000051
Figure FDA0002639185840000052
Figure FDA0002639185840000053
7. the method for the intelligent boiler coordination system of the coal-fired unit of the power plant as claimed in claim 3 or claim 5, wherein the interval between the random adjacent time points of the pressure value of the sampled boiler outlet steam pressure of the pressure sensor can be set randomly.
8. The method for the intelligent boiler coordination system of a power plant coal-fired unit as claimed in claim 5, wherein said power plant coal-fired unitUnder the condition that P pressure sensors are vertically arranged at the boiler steam outlet of the boiler, the pressure value of the boiler outlet steam pressure sampled by the pressure sensors is determined to be VrThe highest data Z1 and the lowest data Z2 of pressure values of the boiler outlet steam pressure sampled by the P pressure sensors at the time point, and the interval size A1 between the pressure sensors sampling the pressure values of the highest data Z1 and the lowest data Z2; the method for estimating the point V at the time by applying the boiler intelligent coordination system aiming at the coal-fired unit of the power plantr+1Pressure value W of boiler outlet steam pressurer+1Also identified is a pressure value W of the estimated boiler outlet steam pressurer+1The highest data Q1 and the lowest data Q2, and the pressure value W of the estimated boiler outlet steam pressurer+1The pressure value of the highest data Q1 and the lowest data Q2 corresponds to the interval size a2 between the pressure sensors, and is then determined by the following equation (22):
{ Q1-Q2}/a2> { Z1-Z2}/a1> -I (22), which is the normal value of the pressure value of the set boiler outlet steam pressure.
If the condition of equation (22) is satisfied, the DCS controller determines that the pressure of the steam at the outlet of the boiler is too high as the main steam pressure, and if the condition of equation (22) is not satisfied, the DCS controller determines that the pressure of the steam at the outlet of the boiler is proper as the main steam pressure, and the coal supply system of the boiler continues to supply the coal to the boiler of the coal-fired unit of the power plant.
CN202010834476.0A 2020-08-19 2020-08-19 Boiler intelligent coordination system and method for coal-fired unit of power plant Active CN112082142B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010834476.0A CN112082142B (en) 2020-08-19 2020-08-19 Boiler intelligent coordination system and method for coal-fired unit of power plant

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010834476.0A CN112082142B (en) 2020-08-19 2020-08-19 Boiler intelligent coordination system and method for coal-fired unit of power plant

Publications (2)

Publication Number Publication Date
CN112082142A true CN112082142A (en) 2020-12-15
CN112082142B CN112082142B (en) 2022-04-29

Family

ID=73729455

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202010834476.0A Active CN112082142B (en) 2020-08-19 2020-08-19 Boiler intelligent coordination system and method for coal-fired unit of power plant

Country Status (1)

Country Link
CN (1) CN112082142B (en)

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08338602A (en) * 1995-06-14 1996-12-24 Babcock Hitachi Kk Boiler controller
CN101216164A (en) * 2007-12-29 2008-07-09 西安交通大学 Water-cooled wall on-line safe evaluation method
JP2009109077A (en) * 2007-10-30 2009-05-21 Takuma Co Ltd Refuse specific gravity detecting device and refuse supply controller
CN202032549U (en) * 2011-04-02 2011-11-09 中国石油化工股份有限公司 Header pressure coordination control system for thermal power plant boiler
CN202546717U (en) * 2011-12-19 2012-11-21 郑州智慧通测控技术有限公司 Chain-grate boiler computer control system
CN103925614A (en) * 2014-04-16 2014-07-16 贵州电力试验研究院 Fuel control method for thermal power unit fast cut back
CN206130949U (en) * 2016-11-07 2017-04-26 重庆交通大学 Is boiler water level assisted to oil carrier steam automatic control system
CN209431384U (en) * 2018-09-13 2019-09-24 大唐陕西发电有限公司 A kind of main vapour overpressure protection apparatus of power plant boiler

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08338602A (en) * 1995-06-14 1996-12-24 Babcock Hitachi Kk Boiler controller
JP2009109077A (en) * 2007-10-30 2009-05-21 Takuma Co Ltd Refuse specific gravity detecting device and refuse supply controller
CN101216164A (en) * 2007-12-29 2008-07-09 西安交通大学 Water-cooled wall on-line safe evaluation method
CN202032549U (en) * 2011-04-02 2011-11-09 中国石油化工股份有限公司 Header pressure coordination control system for thermal power plant boiler
CN202546717U (en) * 2011-12-19 2012-11-21 郑州智慧通测控技术有限公司 Chain-grate boiler computer control system
CN103925614A (en) * 2014-04-16 2014-07-16 贵州电力试验研究院 Fuel control method for thermal power unit fast cut back
CN206130949U (en) * 2016-11-07 2017-04-26 重庆交通大学 Is boiler water level assisted to oil carrier steam automatic control system
CN209431384U (en) * 2018-09-13 2019-09-24 大唐陕西发电有限公司 A kind of main vapour overpressure protection apparatus of power plant boiler

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
易智伟: ""磨煤机功率信号在给煤调节系统中的应用"", 《华北电力》 *

Also Published As

Publication number Publication date
CN112082142B (en) 2022-04-29

Similar Documents

Publication Publication Date Title
CN107023825A (en) Fluidized-bed combustion boiler is controlled and combustion optimizing system
US8141367B2 (en) System and methods for pre-heating fuel in a power plant
CN108679592B (en) A kind of the boiler load control system and control method of biomass boiler
WO2020181679A1 (en) Control method for transient varying load coal supply quantity considering exergy storage modification of coal-fired boiler
CN105485715B (en) The device and method of at least one operating parameter for controlling devices
CN102901081A (en) Double-flue double-reheat DC (Direct Current) boiler with overall horizontal arrangement on heating surface in boiler
CN110472274A (en) A kind of boiler flow field thermal deviation model real-time predicting method
CN113489024B (en) Multi-mode steam extraction auxiliary peak regulation and frequency modulation control system and method for cogeneration unit
CN109654517B (en) Boiler soot blowing optimization method based on heating surface health state prediction
CN110005488B (en) Energy-saving optimization method for high-back-pressure heat supply system
CN109625980B (en) Pneumatic ash removal system and ash conveying time optimization method
CN112082142B (en) Boiler intelligent coordination system and method for coal-fired unit of power plant
CN110298502A (en) Based on the boiler optimum oxygen calculation method that efficiency is optimal
CN203549787U (en) Single-pressure saturated vapor superheated boiler
CN109812800B (en) Reheating steam temperature control method with participation of steam extraction throttling of high-pressure heater of coal-fired unit
CN116243740A (en) Intelligent ORC evaporator temperature adjusting method and device based on ceramic industry
CN203771372U (en) Device for detecting generation rate of oxide skin on heating surface of high-temperature steam side of thermodynamic system
CN111855953A (en) Method and system for quickly feeding back calorific value of coal as fired in coal-fired power plant
CN202141070U (en) Combustion control device for gas injection boilers in oil fields
CN111830831B (en) Control optimization method and control optimization system applying multi-term self-adaptive dynamic feedforward
CN111428906B (en) Industrial boiler steam volume prediction method based on image transformation
CN108149001A (en) A kind of jet heating system and its control method
CN201662321U (en) Novel special gas-burning roller kiln temperature computerized monitoring system for casting rolling cast stone plates
CN115095848B (en) Steam temperature control method considering dynamic characteristics and variable load rate of secondary reheating unit
CN205782843U (en) A kind of steel-making afterheat steam is utilized to carry out the system that generates electricity

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant