CN116221767A - Pulverized coal distribution rate determining method and system - Google Patents
Pulverized coal distribution rate determining method and system Download PDFInfo
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- CN116221767A CN116221767A CN202310255299.4A CN202310255299A CN116221767A CN 116221767 A CN116221767 A CN 116221767A CN 202310255299 A CN202310255299 A CN 202310255299A CN 116221767 A CN116221767 A CN 116221767A
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- 239000003245 coal Substances 0.000 title claims abstract description 365
- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000009826 distribution Methods 0.000 title claims abstract description 27
- 239000000843 powder Substances 0.000 claims abstract description 154
- 238000012937 correction Methods 0.000 claims description 51
- 239000002245 particle Substances 0.000 claims description 47
- 239000011159 matrix material Substances 0.000 claims description 26
- 238000012544 monitoring process Methods 0.000 claims description 14
- 239000002817 coal dust Substances 0.000 claims description 7
- 238000012545 processing Methods 0.000 claims description 6
- 238000002485 combustion reaction Methods 0.000 abstract description 13
- 239000003344 environmental pollutant Substances 0.000 abstract description 6
- 231100000719 pollutant Toxicity 0.000 abstract description 6
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012806 monitoring device Methods 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
- 230000005514 two-phase flow Effects 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N1/00—Regulating fuel supply
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B35/00—Control systems for steam boilers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Abstract
The application relates to the technical field of combustion control of pulverized coal boilers of large coal-fired power plants, in particular to a method and a system for determining pulverized coal distribution rate. Comprising the following steps: setting the corresponding pulverized coal demand of the primary air pipe according to the working parameters of the burner, generating a pulverized coal concentration value, and setting the pulverized coal jet flow speed according to the pulverized coal concentration; acquiring the operation parameters of the burner, correcting the jet velocity of the pulverized coal according to the operation parameters of the burner, and setting the working parameters of the balance valve; and acquiring a real-time coal powder mass flow value, generating a real-time coal powder mass flow deviation value, and correcting working parameters of the balance valve according to the coal powder mass flow deviation value. According to the combustion data and state of the burner, the impact degree of the pulverized coal in the primary air pipe on the valve core is adjusted by controlling the balance valve to change the aerodynamic field, and the flow speed and the powder amount of the pulverized coal flow are balanced. The combustion efficiency is improved, and the coal consumption and the pollutant emission are reduced.
Description
Technical Field
The application relates to the technical field of combustion control of pulverized coal boilers of large coal-fired power plants, in particular to a method and a system for determining pulverized coal distribution rate.
Background
At present, coal is still used as a main fuel in power plants in China. In coal-fired power plants, a coal pulverizing system is an indispensable system, and a medium-speed coal mill powder feeding system is mostly adopted in domestic coal-fired power plants. In order to enable the coal powder to be fully combusted in the boiler, the air speed deviation of each powder feeding pipe of the same-layer burner of the powder feeding system is required to be lower than 8 percent, and the concentration deviation of the coal powder is required to be lower than 10 percent. However, in actual production, due to the existence of factors such as moisture, ash content, granularity of raw coal and the like of the raw coal, the wind speed and the pulverized coal distribution among the air channels are uneven.
At present, as the mass flow of the pulverized coal in the gas-solid two-phase flow of the pulverized coal cannot be measured on line, the pulverized coal distribution and leveling can only be carried out by replacing the pulverized coal with air under the cold working condition, and the lagging leveling method finally causes quite high pulverized coal flow distribution deviation which can reach +/-30 to +/-50 percent at most. This not only affects the safe operation of the boiler, but also is detrimental to reducing the coal consumption and the pollutant emissions.
Disclosure of Invention
The purpose of the present application is: in order to solve the technical problems, the application provides a method and a system for determining the pulverized coal distribution rate
In some embodiments of the present application, according to the combustion data and state of the burner, the impact degree of the pulverized coal on the valve core in the primary air pipe is adjusted by controlling the balance valve to change the aerodynamic field, so as to balance the flow speed and the powder amount of the pulverized coal flow. The combustion efficiency is improved, and the coal consumption and the pollutant emission are reduced.
In some embodiments of the application, when the deviation of the mass flow of the pulverized coal at the outlet of the powder feeding pipe is large, the jet speed of the pulverized coal is dynamically adjusted to match with different opening degrees of the balance valve, so that the deviation of the mass flow of the pulverized coal is reduced, the uniformity of the pulverized coal is improved, and the safe operation of the boiler is ensured.
In some embodiments of the present application, a method for determining a pulverized coal distribution rate is provided, including:
setting the corresponding pulverized coal demand of the primary air pipe according to the working parameters of the burner, generating a pulverized coal concentration value, and setting the pulverized coal jet flow speed according to the pulverized coal concentration;
acquiring a burner operation parameter, correcting the pulverized coal jet flow speed according to the burner operation parameter, and setting the working parameter of a balance valve;
and acquiring a real-time pulverized coal mass flow value, generating a real-time pulverized coal mass flow deviation value, and correcting working parameters of the balance valve according to the pulverized coal mass flow deviation value.
In some embodiments of the present application, when setting the pulverized coal jet velocity according to the pulverized coal concentration, the method includes:
presetting a coal powder concentration value matrix A, and setting A (A1, A2, A3 and A4), wherein A1 is a preset first coal powder concentration value, A2 is a preset second coal powder concentration value, A3 is a preset third coal powder concentration value, A4 is a preset fourth coal powder concentration value, and A1 is more than A2 and less than A3 and less than A4;
presetting a coal powder jet velocity matrix B, and setting B (B1, B2, B3 and B4), wherein B1 is a preset first coal powder jet velocity, B2 is a preset second coal powder jet velocity, B3 is a preset third coal powder jet velocity, B4 is a preset fourth coal powder jet velocity, and B1 is more than 2 and less than B3 and less than B4;
acquiring a coal powder concentration value a, and setting a real-time coal powder jet speed b according to the coal powder concentration value a;
when A1 is less than a and less than A2, setting the real-time pulverized coal jet velocity B as a preset first pulverized coal jet velocity B1, namely b=B1;
when A2 is less than a < A3, setting the real-time pulverized coal jet velocity B as a preset second pulverized coal jet velocity B2, namely b=B2;
when A3 is less than a < A4, setting the real-time pulverized coal jet velocity B as a preset third pulverized coal jet velocity B3, namely b=B3;
when a > A4, the real-time pulverized coal jet velocity B is set to a preset fourth pulverized coal jet velocity B4, i.e., b=b4.
In some embodiments of the present application, the correcting the pulverized coal jet velocity according to the burner operation parameters includes;
presetting an unburnt coal powder particle content matrix C, and setting C (C1, C2, C3 and C4), wherein C1 is the content of the first unburnt coal powder particles, C2 is the content of the second unburnt coal powder particles, C3 is the content of the third unburnt coal powder particles, C4 is the content of the fourth unburnt coal powder particles, and C1 is more than C2 and less than C3 and less than C4;
presetting a pulverized coal jet velocity correction coefficient matrix N, and setting N (N1, N2, N3 and N4), wherein N1 is a preset first pulverized coal jet velocity correction coefficient, N2 is a preset second pulverized coal jet velocity correction coefficient, N3 is a preset third pulverized coal jet velocity correction coefficient, and N4 is a preset fourth pulverized coal jet velocity correction coefficient, N1 is more than 0.7 and less than N2 and N3 is more than N4 and less than 1;
obtaining the particle content c of unburned coal powder, and setting a coal powder jet speed correction coefficient n according to the particle content of the unburned coal powder;
when C is less than C1, the corrected real-time pulverized coal jet velocity b3=b;
when C1 is less than C2, setting n=n4, and correcting the real-time pulverized coal jet velocity b3=n4;
when C2 is less than C3, setting n=n3, and correcting the real-time pulverized coal jet velocity b3=n3;
when C3 is less than C4, setting n=n2, and correcting the real-time pulverized coal jet velocity b3=n2;
when C > C4, n=n1 is set, and the corrected real-time pulverized coal jet velocity b3=n1×bi.
In some embodiments of the present application, when the burner operation parameter modifies the operation parameter of the balance valve, the method includes:
and obtaining the content c of unburned coal powder particles, and setting the opening d of a balance valve according to the unburned coal powder particles c.
In some embodiments of the present application, when the balance valve opening d is set according to the unburnt pulverized coal particles c, the method includes:
presetting a balance valve opening matrix D, and setting D (D1, D2, D3 and D4), wherein D1 is a preset first balance valve opening, D2 is a preset second balance valve opening, D3 is a preset third balance valve opening, D4 is a preset fourth balance valve opening, and D1 is more than D2 and less than D3 and less than D4;
when C1 < C2, setting the balance valve opening D to a preset fourth balance valve opening D4, i.e., d=d4;
when C2 < C3, setting the balance valve opening D to be a preset third balance valve opening D3, i.e., d=d3;
when C3 < C4, setting the balance valve opening D to be a preset second fourth balance valve opening D2, i.e., d=d2;
when C > C4, the balance valve opening D is set to the preset first balance valve opening D1, i.e., d=d1.
In some embodiments of the present application, when acquiring the real-time pulverized coal mass flow value and generating the real-time pulverized coal mass flow deviation value, the method includes:
acquiring a coal powder concentration value a1 at an air inlet, a coal powder flow velocity value b1 and a primary air pipe cross-sectional area s1, and generating real-time coal powder mass flow Q1 at the air inlet, wherein Q1=a1×b1×s1;
acquiring a coal powder concentration value a2 at an air outlet, a coal powder flow velocity value b2 and a balance valve opening area s2, and generating real-time coal powder mass flow Q2 at the air outlet, wherein Q2 = a2 x b2 x s2;
and generating a real-time pulverized coal mass flow deviation value e according to the real-time pulverized coal mass flow Q1 at the air inlet and the real-time pulverized coal mass flow Q2 at the air inlet.
In some embodiments of the present application, when correcting the working parameter of the primary air duct according to the mass flow difference value, the method includes:
presetting a coal powder mass flow deviation value matrix E, and setting E (E1, E2, E3 and E4), wherein E1 is a preset first coal powder mass flow deviation value, E2 is a preset second coal powder mass flow deviation value, E3 is a preset third coal powder mass flow deviation value, E4 is a preset fourth coal powder mass flow deviation value, and E1 is less than E2 and less than E3 and less than E4;
presetting a balance valve opening correction parameter matrix M, and setting M (M1, M2, M3 and M4), wherein M1 is a preset first balance valve opening correction parameter, M2 is a preset second balance valve opening correction parameter, M3 is a preset third balance valve opening correction parameter, M4 is a preset fourth balance valve opening correction parameter, and M1 is more than 0.7 and less than M2 and M3 is more than M4 and less than 1;
setting a balance valve opening correction parameter m according to a real-time pulverized coal mass flow deviation value e, and correcting a real-time balance valve opening d;
when E1 < E2, setting m=m1, and correcting the corrected balance valve opening d=m1×di;
when E2 < E3, setting m=m2, and correcting the corrected balance valve opening d=m2×di;
when E3 < E4, setting m=m3, and correcting the corrected balance valve opening d=m3×di;
when E > E4, m=m4 is set, and the corrected balance valve opening d=m4×di.
In some embodiments of the present application, further comprising;
setting a pulverized coal jet velocity compensation coefficient g according to the real-time pulverized coal mass flow deviation value e, and correcting the real-time pulverized coal jet velocity b;
presetting a pulverized coal jet velocity compensation coefficient matrix G, and setting G (G1, G2), wherein G1 is a preset first pulverized coal jet velocity compensation coefficient, G2 is a preset second pulverized coal jet velocity compensation coefficient, and G1 is more than 0.8 and less than G2 and less than 1;
when E3 is less than E and less than E4, g=g1 is set, and the corrected real-time pulverized coal jet velocity b4=g1×b3;
when E > E4, g=g2 is set, and the corrected real-time pulverized coal jet velocity b4=g2×b3.
In some embodiments of the present application, a pulverized coal distribution rate determining system is provided, including:
the first monitoring module is arranged at the air inlet and the air outlet of the primary air pipe and is used for collecting coal dust concentration data and coal dust flow rate data;
the first control module is used for controlling the opening degree of the balance valve;
the second control module is used for setting the jet flow speed of the pulverized coal;
the second monitoring module is used for collecting the content data of unburned pulverized coal particles;
the central control unit is connected with the first monitoring module and the second monitoring module, and the first control module and the second control module are connected through wireless signals;
the central control unit is used for setting working parameters of the first control module and the second control module.
In some embodiments of the present application, the central control unit further includes:
the first processing module is used for obtaining a coal powder concentration value and setting the real-time coal powder jet speed according to the coal powder concentration value;
the first correction module is used for obtaining the particle content of unburned coal powder and setting a coal powder jet speed correction coefficient according to the particle content of the unburned coal powder;
the second processing module is used for obtaining the content of unburned coal powder particles and setting the opening of a balance valve according to the unburned coal powder particles;
the second correction module is used for acquiring a real-time pulverized coal mass flow deviation value and setting a balance valve opening correction parameter according to the real-time pulverized coal mass flow deviation value;
and the third correction module is used for acquiring the real-time pulverized coal mass flow deviation value and setting a pulverized coal jet flow velocity compensation coefficient according to the real-time pulverized coal mass flow deviation value.
Compared with the prior art, the method and the system for determining the pulverized coal distribution rate have the beneficial effects that:
according to the combustion data and state of the burner, the impact degree of the pulverized coal in the primary air pipe on the valve core is adjusted by controlling the balance valve to change the aerodynamic field, and the flow speed and the powder amount of the pulverized coal flow are balanced. The combustion efficiency is improved, and the coal consumption and the pollutant emission are reduced.
When the deviation of the mass flow of the pulverized coal at the outlet of the powder feeding pipe is large, the pulverized coal jet speed is dynamically adjusted, and different balance valve openings are matched, so that the deviation of the mass flow of the pulverized coal is reduced, the uniformity of the pulverized coal is improved, and the safe operation of the boiler is ensured.
Drawings
FIG. 1 is a schematic flow chart of a method for determining a pulverized coal distribution rate in a preferred embodiment of the present application;
fig. 2 is a schematic diagram of a pulverized coal distribution rate determining system according to a preferred embodiment of the present application.
Detailed Description
The detailed description of the present application is further described in detail below with reference to the drawings and examples. The following examples are illustrative of the present application, but are not intended to limit the scope of the present application.
In the description of the present application, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate description of the present application and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.
The terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art in a specific context.
As shown in fig. 1, a method for determining a pulverized coal distribution rate according to a preferred embodiment of the present application includes:
s101: setting the corresponding pulverized coal demand of the primary air pipe according to the working parameters of the burner, generating a pulverized coal concentration value, and setting the pulverized coal jet flow speed according to the pulverized coal concentration;
s102: acquiring the operation parameters of the burner, correcting the jet velocity of the pulverized coal according to the operation parameters of the burner, and setting the working parameters of the balance valve;
s103: and acquiring a real-time coal powder mass flow value, generating a real-time coal powder mass flow deviation value, and correcting working parameters of the balance valve according to the coal powder mass flow deviation value.
Specifically, when the pulverized coal jet velocity is set according to the pulverized coal concentration, the method includes:
presetting a coal powder concentration value matrix A, and setting A (A1, A2, A3 and A4), wherein A1 is a preset first coal powder concentration value, A2 is a preset second coal powder concentration value, A3 is a preset third coal powder concentration value, A4 is a preset fourth coal powder concentration value, and A1 is more than A2 and less than A3 and less than A4;
presetting a coal powder jet velocity matrix B, and setting B (B1, B2, B3 and B4), wherein B1 is a preset first coal powder jet velocity, B2 is a preset second coal powder jet velocity, B3 is a preset third coal powder jet velocity, B4 is a preset fourth coal powder jet velocity, and B1 is more than 2 and less than B3 and less than B4;
acquiring a coal powder concentration value a, and setting a real-time coal powder jet speed b according to the coal powder concentration value a;
when A1 is less than a and less than A2, setting the real-time pulverized coal jet velocity B as a preset first pulverized coal jet velocity B1, namely b=B1;
when A2 is less than a < A3, setting the real-time pulverized coal jet velocity B as a preset second pulverized coal jet velocity B2, namely b=B2;
when A3 is less than a < A4, setting the real-time pulverized coal jet velocity B as a preset third pulverized coal jet velocity B3, namely b=B3;
when a > A4, the real-time pulverized coal jet velocity B is set to a preset fourth pulverized coal jet velocity B4, i.e., b=b4.
Specifically, when the pulverized coal jet velocity is corrected according to the burner operation parameters, the method comprises the following steps of;
presetting an unburnt coal powder particle content matrix C, and setting C (C1, C2, C3 and C4), wherein C1 is the content of the first unburnt coal powder particles, C2 is the content of the second unburnt coal powder particles, C3 is the content of the third unburnt coal powder particles, C4 is the content of the fourth unburnt coal powder particles, and C1 is more than C2 and less than C3 and less than C4;
presetting a pulverized coal jet velocity correction coefficient matrix N, and setting N (N1, N2, N3 and N4), wherein N1 is a preset first pulverized coal jet velocity correction coefficient, N2 is a preset second pulverized coal jet velocity correction coefficient, N3 is a preset third pulverized coal jet velocity correction coefficient, and N4 is a preset fourth pulverized coal jet velocity correction coefficient, N1 is more than 0.7 and less than N2 and N3 is more than N4 and less than 1;
obtaining the particle content c of unburned coal powder, and setting a coal powder jet speed correction coefficient n according to the particle content of the unburned coal powder;
when C is less than C1, the corrected real-time pulverized coal jet velocity b3=b;
when C1 is less than C2, setting n=n4, and correcting the real-time pulverized coal jet velocity b3=n4;
when C2 is less than C3, setting n=n3, and correcting the real-time pulverized coal jet velocity b3=n3;
when C3 is less than C4, setting n=n2, and correcting the real-time pulverized coal jet velocity b3=n2;
when C > C4, n=n1 is set, and the corrected real-time pulverized coal jet velocity b3=n1×bi.
It can be understood that in the above embodiment, by presetting the coal powder concentration value matrix and the coal powder jet velocity matrix, the real-time coal powder jet velocity is set according to different initial coal powder concentrations of the primary air pipe, so as to improve the uniformity of coal powder, solve the problem of uneven air speed and coal powder distribution between air channels, and dynamically adjust the coal powder jet velocity by acquiring the running state of the burner with real-time unburnt coal powder particle content, so as to improve the combustion efficiency of the boiler.
In a preferred embodiment of the present application, when the burner operation parameter corrects the operation parameter of the balance valve, the method includes:
and obtaining the unburnt pulverized coal particle content c, and setting the opening d of the balance valve according to the unburnt pulverized coal particles c.
Specifically, setting the balance valve opening d based on the unburned pulverized coal particles c includes:
presetting a balance valve opening matrix D, and setting D (D1, D2, D3 and D4), wherein D1 is a preset first balance valve opening, D2 is a preset second balance valve opening, D3 is a preset third balance valve opening, D4 is a preset fourth balance valve opening, and D1 is more than D2 and less than D3 and less than D4;
when C1 < C2, setting the balance valve opening D to a preset fourth balance valve opening D4, i.e., d=d4;
when C2 < C3, setting the balance valve opening D to be a preset third balance valve opening D3, i.e., d=d3;
when C3 < C4, setting the balance valve opening D to be a preset second fourth balance valve opening D2, i.e., d=d2;
when C > C4, the balance valve opening D is set to the preset first balance valve opening D1, i.e., d=d1.
It can be understood that in the above embodiment, according to the combustion data and the state of the burner, the impact degree of the pulverized coal in the primary air pipe on the valve core is adjusted by controlling the balance valve to change the aerodynamic field, so as to balance the flow speed and the powder amount of the pulverized coal flow. The combustion efficiency is improved, and the coal consumption and the pollutant emission are reduced.
In a preferred embodiment of the present application, when acquiring a real-time pulverized coal mass flow value and generating a real-time pulverized coal mass flow deviation value, the method includes:
acquiring a coal powder concentration value a1 at an air inlet, a coal powder flow velocity value b1 and a primary air pipe cross-sectional area s1, and generating real-time coal powder mass flow Q1 at the air inlet, wherein Q1=a1×b1×s1;
acquiring a coal powder concentration value a2 at an air outlet, a coal powder flow velocity value b2 and a balance valve opening area s2, and generating real-time coal powder mass flow Q2 at the air outlet, wherein Q2 = a2 x b2 x s2;
and generating a real-time pulverized coal mass flow deviation value e according to the real-time pulverized coal mass flow Q1 at the air inlet and the real-time pulverized coal mass flow Q2 at the air inlet.
Specifically, when the working parameters of the primary air pipe are corrected according to the mass flow difference value, the method comprises the following steps:
presetting a coal powder mass flow deviation value matrix E, and setting E (E1, E2, E3 and E4), wherein E1 is a preset first coal powder mass flow deviation value, E2 is a preset second coal powder mass flow deviation value, E3 is a preset third coal powder mass flow deviation value, E4 is a preset fourth coal powder mass flow deviation value, and E1 is less than E2 and less than E3 and less than E4;
presetting a balance valve opening correction parameter matrix M, and setting M (M1, M2, M3 and M4), wherein M1 is a preset first balance valve opening correction parameter, M2 is a preset second balance valve opening correction parameter, M3 is a preset third balance valve opening correction parameter, M4 is a preset fourth balance valve opening correction parameter, and M1 is more than 0.7 and less than M2 and M3 is more than M4 and less than 1;
setting a balance valve opening correction parameter m according to a real-time pulverized coal mass flow deviation value e, and correcting a real-time balance valve opening d;
when E1 < E2, setting m=m1, and correcting the corrected balance valve opening d=m1×di;
when E2 < E3, setting m=m2, and correcting the corrected balance valve opening d=m2×di;
when E3 < E4, setting m=m3, and correcting the corrected balance valve opening d=m3×di;
when E > E4, m=m4 is set, and the corrected balance valve opening d=m4×di.
Specifically, it also includes;
setting a pulverized coal jet velocity compensation coefficient g according to a real-time pulverized coal mass flow deviation value e, and correcting a real-time pulverized coal jet velocity b;
presetting a pulverized coal jet velocity compensation coefficient matrix G, and setting G (G1, G2), wherein G1 is a preset first pulverized coal jet velocity compensation coefficient, G2 is a preset second pulverized coal jet velocity compensation coefficient, and G1 is more than 0.8 and less than G2 and less than 1;
when E3 is less than E and less than E4, g=g1 is set, and the corrected real-time pulverized coal jet velocity b4=g1×b3;
when E > E4, g=g2 is set, and the corrected real-time pulverized coal jet velocity b4=g2×b3.
It can be understood that in the above embodiment, when the deviation of the pulverized coal mass flow at the outlet of the powder feeding pipe is large, the pulverized coal jet speed is dynamically adjusted to match with different opening degrees of the balance valve, so that the deviation of the pulverized coal mass flow is reduced, the uniformity of the pulverized coal is improved, and the safe operation of the boiler is ensured.
In still another preferred embodiment of the method for determining a coal powder distribution rate according to the above preferred embodiment, as shown in fig. 2, the present embodiment provides a system for determining a coal powder distribution rate, including:
the first monitoring module is arranged at the air inlet and the air outlet of the primary air pipe, and the detection module is used for collecting coal dust concentration data and coal dust flow rate data;
the first control module is used for controlling the opening degree of the balance valve;
the second control module is used for setting the jet flow speed of the pulverized coal;
the second monitoring module is used for collecting the content data of unburned pulverized coal particles;
the central control unit is connected with the first monitoring module and the second monitoring module, and the first control module and the second control module are connected through wireless signals;
the central control unit is used for setting working parameters of the first control module and the second control module.
Specifically, the second monitoring module is preferably a iFS spectrum monitoring device arranged on the burnout wind layer, and can monitor the particle content of unburned coal dust after the burnout wind;
in particular, the first monitoring module is preferably
Specifically, the central control unit further includes:
the first processing module is used for obtaining a coal powder concentration value and setting a real-time coal powder jet speed according to the coal powder concentration value;
the first correction module is used for obtaining the particle content of the unburned coal powder and setting a coal powder jet speed correction coefficient according to the particle content of the unburned coal powder;
the second processing module is used for obtaining the content of unburned coal powder particles and setting the opening of the balance valve according to the unburned coal powder particles;
the second correction module is used for acquiring a real-time pulverized coal mass flow deviation value and setting a balance valve opening correction parameter according to the real-time pulverized coal mass flow deviation value;
and the third correction module is used for acquiring the real-time pulverized coal mass flow deviation value and setting a pulverized coal jet flow velocity compensation coefficient according to the real-time pulverized coal mass flow deviation value.
According to the first conception of the application, according to the combustion data and state of the burner, the impact degree of the pulverized coal on the valve core in the primary air pipe is adjusted by controlling the balance valve to change the aerodynamic field, and the flow speed and the powder amount of the pulverized coal flow are balanced. The combustion efficiency is improved, and the coal consumption and the pollutant emission are reduced.
According to the second conception of the application, when the deviation of the mass flow of the pulverized coal at the outlet of the powder feeding pipe is large, the pulverized coal jet speed is dynamically adjusted, different opening degrees of the balance valves are matched, the deviation of the mass flow of the pulverized coal is reduced, the uniformity of the pulverized coal is improved, and the safe operation of the boiler is ensured.
The foregoing is merely a preferred embodiment of the present application, and it should be noted that modifications and substitutions can be made by those skilled in the art without departing from the technical principles of the present application, and these modifications and substitutions should also be considered as being within the scope of the present application.
Claims (10)
1. A method for determining a pulverized coal distribution rate, comprising:
setting the corresponding pulverized coal demand of the primary air pipe according to the working parameters of the burner, generating a pulverized coal concentration value, and setting the pulverized coal jet flow speed according to the pulverized coal concentration;
acquiring a burner operation parameter, correcting the pulverized coal jet flow speed according to the burner operation parameter, and setting the working parameter of a balance valve;
and acquiring a real-time pulverized coal mass flow value, generating a real-time pulverized coal mass flow deviation value, and correcting working parameters of the balance valve according to the pulverized coal mass flow deviation value.
2. The pulverized coal distribution rate determining method according to claim 1, wherein when the pulverized coal jet velocity is set according to the pulverized coal concentration, comprising:
presetting a coal powder concentration value matrix A, and setting A (A1, A2, A3 and A4), wherein A1 is a preset first coal powder concentration value, A2 is a preset second coal powder concentration value, A3 is a preset third coal powder concentration value, A4 is a preset fourth coal powder concentration value, and A1 is more than A2 and less than A3 and less than A4;
presetting a coal powder jet velocity matrix B, and setting B (B1, B2, B3 and B4), wherein B1 is a preset first coal powder jet velocity, B2 is a preset second coal powder jet velocity, B3 is a preset third coal powder jet velocity, B4 is a preset fourth coal powder jet velocity, and B1 is more than 2 and less than B3 and less than B4;
acquiring a coal powder concentration value a, and setting a real-time coal powder jet speed b according to the coal powder concentration value a;
when A1 is less than a and less than A2, setting the real-time pulverized coal jet velocity B as a preset first pulverized coal jet velocity B1, namely b=B1;
when A2 is less than a < A3, setting the real-time pulverized coal jet velocity B as a preset second pulverized coal jet velocity B2, namely b=B2;
when A3 is less than a < A4, setting the real-time pulverized coal jet velocity B as a preset third pulverized coal jet velocity B3, namely b=B3;
when a > A4, the real-time pulverized coal jet velocity B is set to a preset fourth pulverized coal jet velocity B4, i.e., b=b4.
3. The method of determining a pulverized coal distribution rate according to claim 2, wherein said correcting the pulverized coal jet velocity according to said burner operation parameter comprises;
presetting an unburnt coal powder particle content matrix C, and setting C (C1, C2, C3 and C4), wherein C1 is the content of the first unburnt coal powder particles, C2 is the content of the second unburnt coal powder particles, C3 is the content of the third unburnt coal powder particles, C4 is the content of the fourth unburnt coal powder particles, and C1 is more than C2 and less than C3 and less than C4;
presetting a pulverized coal jet velocity correction coefficient matrix N, and setting N (N1, N2, N3 and N4), wherein N1 is a preset first pulverized coal jet velocity correction coefficient, N2 is a preset second pulverized coal jet velocity correction coefficient, N3 is a preset third pulverized coal jet velocity correction coefficient, and N4 is a preset fourth pulverized coal jet velocity correction coefficient, N1 is more than 0.7 and less than N2 and N3 is more than N4 and less than 1;
obtaining the particle content c of unburned coal powder, and setting a coal powder jet speed correction coefficient n according to the particle content of the unburned coal powder;
when C is less than C1, the corrected real-time pulverized coal jet velocity b3=b;
when C1 is less than C2, setting n=n4, and correcting the real-time pulverized coal jet velocity b3=n4;
when C2 is less than C3, setting n=n3, and correcting the real-time pulverized coal jet velocity b3=n3;
when C3 is less than C4, setting n=n2, and correcting the real-time pulverized coal jet velocity b3=n2;
when C > C4, n=n1 is set, and the corrected real-time pulverized coal jet velocity b3=n1×bi.
4. A method for determining a pulverized coal distribution rate as claimed in claim 3, wherein when the burner operation parameter is corrected to the operation parameter of the balance valve, comprising:
and obtaining the content c of unburned coal powder particles, and setting the opening d of a balance valve according to the unburned coal powder particles c.
5. The method of determining a pulverized coal distribution ratio according to claim 4, wherein the setting of the balance valve opening d according to the unburnt pulverized coal particles c comprises:
presetting a balance valve opening matrix D, and setting D (D1, D2, D3 and D4), wherein D1 is a preset first balance valve opening, D2 is a preset second balance valve opening, D3 is a preset third balance valve opening, D4 is a preset fourth balance valve opening, and D1 is more than D2 and less than D3 and less than D4;
when C1 < C2, setting the balance valve opening D to a preset fourth balance valve opening D4, i.e., d=d4;
when C2 < C3, setting the balance valve opening D to be a preset third balance valve opening D3, i.e., d=d3;
when C3 < C4, setting the balance valve opening D to be a preset second fourth balance valve opening D2, i.e., d=d2;
when C > C4, the balance valve opening D is set to the preset first balance valve opening D1, i.e., d=d1.
6. The method of determining a pulverized coal distribution rate according to claim 5, wherein the step of obtaining the real-time pulverized coal mass flow value and generating the real-time pulverized coal mass flow deviation value includes:
acquiring a coal powder concentration value a1 at an air inlet, a coal powder flow velocity value b1 and a primary air pipe cross-sectional area s1, and generating real-time coal powder mass flow Q1 at the air inlet, wherein Q1=a1×b1×s1;
acquiring a coal powder concentration value a2 at an air outlet, a coal powder flow velocity value b2 and a balance valve opening area s2, and generating real-time coal powder mass flow Q2 at the air outlet, wherein Q2 = a2 x b2 x s2;
and generating a real-time pulverized coal mass flow deviation value e according to the real-time pulverized coal mass flow Q1 at the air inlet and the real-time pulverized coal mass flow Q2 at the air inlet.
7. The method of determining a pulverized coal distribution rate according to claim 6, wherein when the operating parameters of the primary air duct are corrected according to the mass flow difference, the method comprises:
presetting a coal powder mass flow deviation value matrix E, and setting E (E1, E2, E3 and E4), wherein E1 is a preset first coal powder mass flow deviation value, E2 is a preset second coal powder mass flow deviation value, E3 is a preset third coal powder mass flow deviation value, E4 is a preset fourth coal powder mass flow deviation value, and E1 is less than E2 and less than E3 and less than E4;
presetting a balance valve opening correction parameter matrix M, and setting M (M1, M2, M3 and M4), wherein M1 is a preset first balance valve opening correction parameter, M2 is a preset second balance valve opening correction parameter, M3 is a preset third balance valve opening correction parameter, M4 is a preset fourth balance valve opening correction parameter, and M1 is more than 0.7 and less than M2 and M3 is more than M4 and less than 1;
setting a balance valve opening correction parameter m according to a real-time pulverized coal mass flow deviation value e, and correcting a real-time balance valve opening d;
when E1 < E2, setting m=m1, and correcting the corrected balance valve opening d=m1×di;
when E2 < E3, setting m=m2, and correcting the corrected balance valve opening d=m2×di;
when E3 < E4, setting m=m3, and correcting the corrected balance valve opening d=m3×di;
when E > E4, m=m4 is set, and the corrected balance valve opening d=m4×di.
8. The pulverized coal distribution rate determining method as set forth in claim 6, further comprising;
setting a pulverized coal jet velocity compensation coefficient g according to the real-time pulverized coal mass flow deviation value e, and correcting the real-time pulverized coal jet velocity b;
presetting a pulverized coal jet velocity compensation coefficient matrix G, and setting G (G1, G2), wherein G1 is a preset first pulverized coal jet velocity compensation coefficient, G2 is a preset second pulverized coal jet velocity compensation coefficient, and G1 is more than 0.8 and less than G2 and less than 1;
when E3 is less than E and less than E4, g=g1 is set, and the corrected real-time pulverized coal jet velocity b4=g1×b3;
when E > E4, g=g2 is set, and the corrected real-time pulverized coal jet velocity b4=g2×b3.
9. A pulverized coal distribution rate determining system, comprising:
the first monitoring module is arranged at the air inlet and the air outlet of the primary air pipe and is used for collecting coal dust concentration data and coal dust flow rate data;
the first control module is used for controlling the opening degree of the balance valve;
the second control module is used for setting the jet flow speed of the pulverized coal;
the second monitoring module is used for collecting the content data of unburned pulverized coal particles;
the central control unit is connected with the first monitoring module and the second monitoring module, and the first control module and the second control module are connected through wireless signals;
the central control unit is used for setting working parameters of the first control module and the second control module.
10. The pulverized coal distribution rate determining system according to claim 9, wherein the central control unit further includes:
the first processing module is used for obtaining a coal powder concentration value and setting the real-time coal powder jet speed according to the coal powder concentration value;
the first correction module is used for obtaining the particle content of unburned coal powder and setting a coal powder jet speed correction coefficient according to the particle content of the unburned coal powder;
the second processing module is used for obtaining the content of unburned coal powder particles and setting the opening of a balance valve according to the unburned coal powder particles;
the second correction module is used for acquiring a real-time pulverized coal mass flow deviation value and setting a balance valve opening correction parameter according to the real-time pulverized coal mass flow deviation value;
and the third correction module is used for acquiring the real-time pulverized coal mass flow deviation value and setting a pulverized coal jet flow velocity compensation coefficient according to the real-time pulverized coal mass flow deviation value.
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