CN108644803B - Real-time leveling device and method for wind powder - Google Patents
Real-time leveling device and method for wind powder Download PDFInfo
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- CN108644803B CN108644803B CN201810603142.5A CN201810603142A CN108644803B CN 108644803 B CN108644803 B CN 108644803B CN 201810603142 A CN201810603142 A CN 201810603142A CN 108644803 B CN108644803 B CN 108644803B
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- 239000000843 powder Substances 0.000 title claims abstract description 66
- 238000000034 method Methods 0.000 title claims abstract description 21
- 239000003245 coal Substances 0.000 claims abstract description 111
- 239000002817 coal dust Substances 0.000 claims abstract description 10
- 238000009434 installation Methods 0.000 claims abstract 2
- 238000002485 combustion reaction Methods 0.000 abstract description 6
- 239000012530 fluid Substances 0.000 description 16
- 239000000203 mixture Substances 0.000 description 6
- 230000005484 gravity Effects 0.000 description 4
- 230000003068 static effect Effects 0.000 description 4
- 230000001105 regulatory effect Effects 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 238000005381 potential energy Methods 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 238000009530 blood pressure measurement Methods 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000009795 derivation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N1/00—Regulating fuel supply
- F23N1/02—Regulating fuel supply conjointly with air supply
- F23N1/022—Regulating fuel supply conjointly with air supply using electronic means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2225/00—Measuring
- F23N2225/04—Measuring pressure
- F23N2225/06—Measuring pressure for determining flow
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2239/00—Fuels
- F23N2239/02—Solid fuels
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
Abstract
The invention discloses a real-time leveling device and a leveling method for wind powder, comprising the following steps: the coal mill separator is connected with the boiler through a plurality of coal powder pipelines; the coal dust pipelines are inverted U-shaped and comprise two vertical sections and a horizontal section, pressure measuring points are arranged on the vertical sections, close to one end of the coal mill separator, of each coal dust pipeline, and the installation positions of the pressure measuring points are the same in height; a differential pressure transmitter is connected between every two adjacent pressure measuring points; the horizontal sections are provided with resistance regulators; the control module is electrically connected with the differential pressure transmitter and the resistance regulator. The wind-powder real-time leveling device provided by the invention can adjust the flow of coal dust and wind in the coal dust pipeline between the coal mill and the boiler, reduce the deviation of the amount of the coal dust and the wind conveyed in each coal dust pipeline, form a closed loop, automatically perform wind-powder leveling control and improve the combustion performance of the boiler.
Description
Technical Field
The invention relates to the technical field of boiler combustion in coal-fired power plants, in particular to a real-time leveling device and a leveling method for wind powder.
Background
At present, a positive pressure direct blowing powder system is mostly adopted in a coal-fired power plant, and as pulverized coal ground by a coal mill is directly blown into a boiler for combustion, in order to ensure the stability and the combustion rate of the boiler for combustion, the concentration, the flow and the fineness of the pulverized coal in each pulverized coal pipeline are required to be kept balanced as much as possible. The concentration of coal fines in the mill separator is relatively uniform, but the coal fines piping from the mill to the boiler is nearly 100 meters long and 20-30 meters short. The length difference between the pipelines is quite large, and the trend of different pipelines is quite different, so that the difference between the on-way resistance loss and the local resistance loss of the pipelines is quite large, the primary air speed in the pipeline with small total resistance is high, the carried pulverized coal amount is also large, the primary air speed in the pipeline with large total resistance is low, the carried pulverized coal amount is small, and the wind and the powder in the pulverized coal pipeline are uneven.
Wind powder, i.e. a mixture of coal powder and conveying medium wind; the main reasons for the non-uniformity of the wind powder are unbalanced resistance loss in the pulverized coal pipeline, and the current wind powder leveling mode has the following two modes:
1. cold leveling method: under the condition of no pulverized coal, the resistance in the pipeline is regulated by using a shrinkage cavity regulating valve, and whether the air quantity is balanced or not is judged by measuring the air speed in the pipeline, and the air quantity is regulated to be within a range of less than 5% in general;
2. the thermal state adjustment method of the balance valve comprises the following steps: and a balance valve with adjustable opening is arranged in the pulverized coal pipeline, meanwhile, an inductor for measuring the concentration and the flow rate of pulverized coal is arranged, the measured data of different pulverized coal pipelines are compared, the result of comparison is used as the basis for adjusting the opening of the balance valve, and the pulverized coal leveling is performed through closed loop control.
The above pulverized coal leveling method has the following problems:
(1) the air quantity is leveled in the cold state, but the air quantity and the powder quantity are uneven in the hot state; (2) the adjustment means is behind, so that the adjustment cannot be performed in real time, and the actual requirements cannot be met; (3) the measuring means is not matched with the environment in the pipeline, so that a correct basis can not be provided for adjusting the environment; (4) the reliability of the measuring element is poor, the abrasion is easy, and the service life is short.
Therefore, how to provide a real-time leveling device and leveling method for wind powder is a problem that needs to be solved by those skilled in the art.
Disclosure of Invention
In view of the above, the invention provides a real-time leveling device and a leveling method for wind powder, which can adjust the flow of coal powder and conveying media in coal powder pipelines from a coal mill to a boiler, reduce the deviation of the quantity of the coal powder and the conveying media conveyed in each coal powder pipeline, and improve the combustion performance of the boiler.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
a real-time wind-powder leveling device, comprising: the coal mill separator is connected with the boiler through a plurality of coal powder pipelines; the coal dust pipelines are of inverted U shape and comprise two vertical sections and horizontal sections, pressure measuring points are arranged on the vertical sections, close to one end of the coal mill separator, of each coal dust pipeline, the mounting positions of the pressure measuring points are the same in height, and a differential pressure transmitter is connected between every two adjacent pressure measuring points; the horizontal sections are provided with resistance regulators; the control module is electrically connected with the differential pressure transmitter and the resistance regulator.
Preferably, a plurality of the resistance regulators are installed at the same position.
Preferably, a differential pressure set value capable of balancing the primary air flow in the pulverized coal pipeline is preset in the control module.
The invention also discloses a real-time leveling method for the wind powder, which comprises the following steps:
s1, setting the opening of a resistance regulator to 80% of the maximum opening; presetting a differential pressure set value for equalizing the primary air flow in a pulverized coal pipeline in a control module;
s2, starting a separator of the coal mill, and measuring pressure differences at two adjacent pressure measuring points by using a pressure difference transmitter;
and S3, the control module sends an adjusting instruction to the resistance regulator according to the pressure difference measured in the step S2, and adjusts the opening degree until the pressure difference is smaller than the pressure difference set value.
Preferably, when the load of the separator of the coal mill changes, the flow velocity and the flow rate of wind and powder in the coal powder pipeline are unbalanced, and when the measured value of the differential pressure transmitter exceeds the set value of the differential pressure, the control module sends an adjusting instruction to the resistance regulator until the wind and powder in a plurality of coal powder pipelines reach balance.
Compared with the prior art, the invention discloses a wind-powder real-time leveling device and a leveling method, wherein the pressure measuring point is arranged on the vertical section of the coal powder pipeline above the coal mill separator and at the same high position, and the pressure difference between the adjacent coal powder pipelines is measured by using the pressure difference transmitter, so that the measuring system error is eliminated, the measuring precision is high, and the pressure difference transmitter is used as a measuring element and is not inserted into the coal powder pipeline, so that the interference to the fluid in the coal powder pipeline is avoided, and the abrasion of the measuring element is avoided.
Meanwhile, the resistance regulator is arranged on the horizontal section coal powder pipeline behind the pressure measuring point, so that the kinetic energy loss before and after the resistance regulator can be reduced, and the accuracy of resistance regulation can be improved; and the control module compares the measured differential pressure value with a differential pressure set value, and when the differential pressure value is larger than the differential pressure set value, sends an adjusting instruction to the resistance regulator to adjust the internal resistance of the pulverized coal pipeline until the differential pressure value is smaller than the differential pressure set value, so that the wind powder is ensured to achieve dynamic balance, and real-time control is realized.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic structural view of a real-time wind powder leveling device provided by the invention.
Fig. 2 is a schematic flow chart of the real-time leveling method for wind powder provided by the invention.
FIG. 3 is a schematic view of various reference cross-sectional parameters provided by the present invention.
The reference numerals are: the coal mill separator is 1, 2 is the pressure measurement point, 3 is the pressure transmitter, 4 is the pulverized coal pipeline, 5 is the resistance regulator, 6 is the boiler, and 7 is the control module.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, the embodiment of the invention discloses a wind powder real-time leveling device, wherein pressure measuring points 2 are arranged on vertical sections of coal powder pipelines above a coal mill separator 1, the positions of the pressure measuring points 2 on a plurality of coal powder pipelines 4 are the same in height, the consistency of pressure loss from the coal mill separator 1 to the pressure measuring points 2 is ensured, and a pressure difference transmitter 3 is arranged between two adjacent pressure measuring points 2 and used for measuring the pressure difference between the two adjacent coal powder pipelines 4; and a resistance regulator 5 is arranged on the horizontal section of the pulverized coal pipeline 4.
Fluid wind powder, i.e. a mixture of coal powder and conveying medium wind, can generate energy loss through a resistance regulator, including kinetic energy loss along the direction of a coal powder pipeline and kinetic energy loss caused by gravity in the vertical direction: when the device is arranged on a horizontal section, the diameter of a pulverized coal pipeline is smaller (generally about 0.4 m), the loss in the vertical direction caused by gravity is smaller, the loss of the kinetic energy of the fluid in the front and back directions through a resistance regulator is smaller in the horizontal forward movement process, and the influence on the movement speed of the fluid is not great; when the device is arranged on a vertical section, in the process that the fluid rises in the vertical direction, the energy loss caused by gravity is large because the pulverized coal pipeline in the vertical direction is long (generally more than 3 m), the kinetic energy loss before and after passing through the resistance regulator is large, and the influence on the rising speed of the fluid is large. Therefore, the resistance regulator is arranged on the horizontal section, so that the kinetic energy loss of the fluid can be reduced, and the resistance regulation is more accurate.
Referring to fig. 2, the invention also discloses a real-time leveling method for wind powder, which comprises the following steps:
s1, setting the opening of the resistance regulator 5 to 80% of the maximum opening; the differential pressure set value for equalizing the primary air flow in the pulverized coal pipeline 4 is preset in the control module 7;
s2, starting the coal mill separator 1, and measuring the pressure difference at two adjacent pressure measuring points 2 through the pressure difference transmitter 3;
and S3, the control module 7 sends an adjusting instruction to the resistance regulator according to the pressure difference measured in the step S2, and adjusts the opening degree until the pressure difference is smaller than the pressure difference set value.
When the load of the coal mill separator 1 changes, the flow speed and the flow rate of wind and powder in the coal powder pipelines 4 are unbalanced, and when the measured value of the differential pressure transmitter 3 exceeds the set value of the differential pressure, the control module 7 sends an adjusting instruction to the resistance adjuster 5 until the wind and powder in the coal powder pipelines 4 reach balance.
The fluid equation applied in the present invention is derived as follows:
firstly, in order to facilitate formula derivation and calculation, on the premise of not influencing calculation results, the following two assumptions are made:
1. ignoring the influence of coal powder on primary air, and regarding the air-powder mixture as a single viscous fluid;
the true density of the pulverized coal is about 1000kg/m 3 The mass ratio of the wind coal in the coal powder pipeline 4 is 2: about 1, the air-powder mixture is calculated according to the method, wherein the pulverized coal occupies 0.05% of the volume, and the influence of the pulverized coal is ignored because the occupied volume proportion is very small.
2. The wind-powder mixture is an incompressible fluid;
the air is compressible gas, but the pressure change value of the pressure measuring point 2 relative to the primary air in the coal mill separator 1 is only 300-400 pa and is only 0.3-0.4% of the absolute pressure of the primary air, so the volume change is ignored, and the air-powder mixture is considered to be incompressible fluid.
Referring to fig. 3, the embodiment is provided with two pulverized coal pipes 4, a pulverized coal pipe a and a pulverized coal pipe B, and correspondingly, a pulverized coal pipe a resistance regulator 5 and a pulverized coal pipe B resistance regulator 5 are respectively arranged on the horizontal section of the pulverized coal pipe a; the contact surface of the coal mill separator 1 and the pulverized coal pipeline 4 is set as a reference section 0, the plane where the pressure measuring point 2 is positioned is set as a reference section 1, and the contact surface of the pulverized coal pipeline 4 and the boiler 6 is set as a reference section 2;
wherein,,
the meaning of each parameter symbol is as follows:
z is potential energy, V is fluid flow velocity, P is static strength at a reference section, deltaP is resistance loss from the reference section to the cross section of a separator of the coal mill, ρ is fluid density, and g is gravity acceleration;
subscript symbol meaning:
a is a coal powder pipeline A, B is a coal powder pipeline B, M is a section of a separator of a coal mill, 0 is a section 0, and 1 is a section 1;
combinations of parameter symbols with subscript symbols, e.g. P A0 Is the static pressure at the reference section 0 in the pulverized coal pipeline A, Z m Potential energy at separator of coal mill, P M Static strength of section of separator of coal mill, V m For fluid flow velocity, V, at the cross-section of the separator of the coal mill A Is the flow velocity of the fluid in the pulverized coal pipeline A, delta P A0 For the resistance loss from the reference section 0 in the pulverized coal pipe A to the section of the separator of the coal mill, deltaP A1 Resistance loss from the reference section 1 in the pulverized coal pipeline A to the section of the separator of the coal mill; similarly, when the lower corner is marked as B, the corresponding value in the pulverized coal pipeline B is represented.
The following equation holds for the pulverized coal pipes a and B according to the viscous fluid bernoulli equation:
the pulverized coal pipes are uniformly and symmetrically arranged on the separator, and the pulverized coal pipes have the same size, so the resistance loss delta P at the section 0 A0 ＝△P B0 The same reason is that the duct size and arrangement between section 0 and section 1 are the same, the drag loss ΔP at section 1 A1 ＝△P B1 . It can be derived from the formulas 1 and 2
As can be seen from equation 3, as long as the static pressure value P at section 1 is referenced A1 ＝P B1 I.e. to prove the flow velocity V in the pulverized coal pipe A and the pulverized coal pipe B A ＝V B The method comprises the steps of carrying out a first treatment on the surface of the Because the diameter of the pulverized coal pipelines 4 is the same, the primary air flow in each pulverized coal pipeline 4 is equal; the concentration of the pulverized coal in the separator 1 of the coal mill is uniform, so that the amount of pulverized coal entering the pulverized coal pipe 4 at this time is also uniform.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (5)
1. The utility model provides a wind powder real-time levelling device which characterized in that includes: the coal mill separator (1), the boiler (6) and a plurality of coal dust pipelines (4), wherein the coal mill separator (1) and the boiler (6) are connected through the plurality of coal dust pipelines (4);
a plurality of buggy pipeline (4) all are the type of falling U, include: the coal pulverizer comprises two vertical sections and a horizontal section, wherein pressure measuring points (2) are arranged on the vertical sections, which are close to one end of a coal pulverizer separator (1), of each coal pulverizer pipeline (4), and the installation positions of the pressure measuring points (2) are the same in height; a differential pressure transmitter (3) is connected between each two adjacent pressure measuring points (2); a resistance regulator (5) is arranged on each horizontal section;
the differential pressure transmitter further comprises a control module (7), wherein the control module (7) is electrically connected with the differential pressure transmitter (3) and the resistance regulator (5).
2. A real-time wind-powder leveling device according to claim 1, characterized in that a plurality of said resistance adjusters (5) are installed in the same position.
3. The wind and powder real-time leveling device according to claim 1, wherein a differential pressure set value capable of balancing the primary wind flow in the pulverized coal pipeline (4) is preset in the control module (7).
4. A real-time leveling method for wind powder, characterized in that the wind powder real-time leveling device according to any one of claims 1-3 is utilized, comprising the following steps:
s1, setting the opening of a resistance regulator (5) at 80% of the maximum opening; presetting a differential pressure set value for equalizing the primary air flow in a pulverized coal pipeline (4) in a control module (7);
s2, starting a coal mill separator (1), and measuring pressure differences at two adjacent pressure measuring points (2) by using a pressure difference transmitter (3);
and S3, the control module (7) sends an adjusting instruction to the resistance regulator (5) according to the pressure difference measured in the step S2, and adjusts the opening degree until the pressure difference is smaller than the pressure difference set value.
5. The real-time wind and powder leveling method according to claim 4, wherein when the load of the coal mill separator (1) changes, the wind and powder flow rate and flow rate in the coal powder pipeline (4) are unbalanced, and when the measured value of the differential pressure transmitter (3) exceeds the set value of the differential pressure, the control module (7) sends an adjusting instruction to the resistance regulator (5) until the wind and powder in a plurality of coal powder pipelines (4) reach balance.
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| CN201810603142.5A CN108644803B (en) | 2018-06-12 | 2018-06-12 | Real-time leveling device and method for wind powder |
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| CN201810603142.5A CN108644803B (en) | 2018-06-12 | 2018-06-12 | Real-time leveling device and method for wind powder |
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| CN109399217B (en) * | 2018-12-06 | 2024-06-14 | 上海意丰机电科技开发有限公司 | Pulverized coal pipeline resistance adjusting device |
| CN113686723B (en) * | 2021-08-24 | 2023-08-15 | 西安热工研究院有限公司 | Wear weight-reduction type pulverized coal pipeline wind-powder deviation measuring device and method |
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Denomination of invention: A real-time leveling device and leveling method for wind powder Granted publication date: 20230912 Pledgee: Minhang Branch of Shanghai Rural Commercial Bank Co.,Ltd. Pledgor: SHANGHAI YIFENG ELECTRICAL AND MECHANICAL TECHNOLOGY DEVELOPMENT CO.,LTD. Registration number: Y2024310000396 |