CN208382222U - A kind of wind powder real-time leveling device - Google Patents
A kind of wind powder real-time leveling device Download PDFInfo
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- CN208382222U CN208382222U CN201820906529.3U CN201820906529U CN208382222U CN 208382222 U CN208382222 U CN 208382222U CN 201820906529 U CN201820906529 U CN 201820906529U CN 208382222 U CN208382222 U CN 208382222U
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- coal
- pulverized coal
- powder
- pipeline
- boiler
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- 239000000843 powder Substances 0.000 title claims abstract description 48
- 239000003245 coal Substances 0.000 claims abstract description 103
- 238000009434 installation Methods 0.000 claims abstract description 3
- 239000002817 coal dust Substances 0.000 abstract description 9
- 239000012530 fluid Substances 0.000 description 17
- 238000000034 method Methods 0.000 description 10
- 239000000203 mixture Substances 0.000 description 6
- 238000002485 combustion reaction Methods 0.000 description 5
- 230000005484 gravity Effects 0.000 description 4
- 230000003068 static effect Effects 0.000 description 4
- 238000004364 calculation method Methods 0.000 description 2
- 238000009795 derivation Methods 0.000 description 2
- 239000002609 medium Substances 0.000 description 2
- 238000005381 potential energy Methods 0.000 description 2
- 239000006163 transport media Substances 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
Abstract
The utility model discloses a kind of wind powder real-time leveling devices, comprising: separator for coal mill, boiler and multiple pulverized coal channels, separator for coal mill and boiler are connected by multiple pulverized coal channels；Multiple pulverized coal channels are inverted u-shaped, including two vertical sections and horizontal segment, each pulverized coal channel is mounted on pressure tap in the vertical section of separator for coal mill one end, and the position height of pressure tap installation is identical, and is respectively connected with pressure difference transmitter between every adjacent pressure tap；Dragulator is mounted on horizontal segment；It further include control module, control module is electrically connected with pressure difference transmitter and dragulator.Wind powder real-time leveling device provided by the utility model, be adjustable coal pulverizer between boiler in pulverized coal channel coal dust and pumped (conveying) medium flow velocity, reduce the deviation of the coal dust amount and pumped (conveying) medium that convey in each pulverized coal channel, form closed loop, it is automatic to carry out wind powder control, improve the combustibility of boiler.
Description
Technical Field
The utility model relates to a coal fired power plant boiler combustion technology field, more specifically the real-time levelling device of wind powder that says so relates to.
Background
At present, a positive-pressure direct-blowing powder preparation system is mostly adopted in a coal-fired power plant, and pulverized coal ground by a coal grinding machine is directly blown into a boiler for combustion, so that the concentration, the flow and the fineness of the pulverized coal in each pulverized coal pipeline are required to be kept as balanced as possible in order to ensure the combustion stability and the combustion rate of the boiler. The concentration of coal fines in the pulverizer separator is relatively uniform, but the coal fines duct from the pulverizer to the boiler is nearly 100 meters long and 20-30 meters short. The length difference between pipelines is quite large, and the trend of different pipelines is also greatly different, so that the on-way resistance loss and the local resistance loss of the pipelines are greatly different, the primary air speed in the pipeline with small total resistance is high, the amount of carried pulverized coal is also large, the primary air speed in the pipeline with large total resistance is low, the amount of carried pulverized coal is small, and the air and powder in the pulverized coal pipeline are uneven.
Wind powder, i.e. a mixture of pulverized coal and conveying medium wind; the main reason for the uneven wind powder is the unbalanced resistance loss in the coal powder pipeline, and the current wind powder leveling modes include the following two modes:
1. cold leveling method: under the condition of no coal powder, the resistance in the pipeline is adjusted by using a shrinkage cavity adjusting valve, whether the air volume is balanced or not is judged by measuring the air speed in the pipeline, and the air volume is generally adjusted to the range of deviation less than 5%;
2. balance valve thermal state regulation method: the method is characterized in that a balance valve with adjustable opening degree is installed in a pulverized coal pipeline, an inductor for measuring pulverized coal concentration and flow rate is installed at the same time, measured data of different pulverized coal pipelines are compared, the comparison result is used as a basis for adjusting the opening degree of the balance valve, and air and powder leveling is carried out through closed-loop control.
The above coal powder leveling method has the following problems:
①, the air quantity is leveled in cold state, but the air quantity and the powder quantity are not flat in hot state, ②, the adjusting means is backward, the real-time adjustment cannot be carried out, the actual requirement cannot be met, ③, the measuring means is not matched with the environment in the pipeline, the correct basis cannot be provided for adjusting the environment, ④, the measuring element has poor reliability, is easy to wear and has short service life.
Therefore, how to provide a wind-powder real-time leveling device is a problem that needs to be solved urgently by the technical personnel in the field.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model provides a real-time levelling device of wind powder can adjust buggy and transport medium in the coal pulverizer pipeline to the boiler between, reduces the buggy volume of carrying in each coal pulverizer pipeline and the deviation of transport medium, improves the combustion performance of boiler.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a wind powder real-time leveling device comprises: the coal pulverizer comprises a coal pulverizer separator, a boiler and a plurality of pulverized coal pipelines, wherein the coal pulverizer separator and the boiler are connected through the plurality of pulverized coal pipelines; the coal powder pipelines are all in an 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 powder pipeline, the installation positions of the pressure measuring points are the same in height, and a pressure difference transmitter is connected between every two adjacent pressure measuring points; the horizontal sections are provided with resistance regulators; the resistance regulator is electrically connected with the pressure difference transmitter and the resistance regulator.
Preferably, a plurality of the resistance adjusters are installed at the same position.
Preferably, a pressure difference set value capable of balancing the primary air flow in the pulverized coal pipeline is preset in the control module.
According to the technical scheme, compared with the prior art, the utility model discloses a wind powder real-time leveling device, the pressure measuring point is in the vertical section of coal dust pipeline above the coal pulverizer separator and in the same high position, uses the pressure difference transmitter to measure the pressure difference between adjacent coal dust pipelines, not only eliminates the measuring system error, and the measurement accuracy is high, but also the pressure difference transmitter is used as a measuring element and is not inserted into the coal dust pipeline, can not interfere with the fluid in the coal dust pipeline, and can not cause the abrasion of the measuring element; meanwhile, the resistance regulator is arranged on the horizontal coal powder pipeline behind the pressure measuring point, so that the kinetic energy loss of the fluid is reduced, and the accuracy of resistance regulation is improved; the control module compares the measured pressure difference value with a pressure difference set value, and when the pressure difference value is larger than the pressure difference set value, an adjusting instruction is sent to the resistance adjuster to adjust the resistance in the pulverized coal pipeline until the pressure difference value is smaller than the pressure difference set value, so that the air-powder dynamic balance is ensured, and the 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 required to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic structural diagram of the wind powder real-time leveling device provided by the present invention.
Fig. 2 is a flow chart of the working process of the wind powder real-time leveling device provided by the present invention.
Figure 3 the attached drawing is the utility model provides an in the course of the work each refer to the sectional parameter sketch map.
Wherein the reference numerals are: the system comprises a coal mill separator 1, a pressure measuring point 2, a pressure transmitter 3, a pulverized coal pipeline 4, a resistance regulator 5, a boiler 6 and a control module 7.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to the attached drawing 1, the embodiment of the utility model discloses a wind powder real-time leveling device, a plurality of pulverized coal pipelines 4 are arranged between a coal mill separator 1 and a boiler 6, a pressure measuring point 2 is installed at the vertical section of the pulverized coal pipeline above the coal mill separator 1, the heights of the pressure measuring points 2 on the plurality of pulverized coal pipelines 4 are the same, the pressure loss from the coal mill separator 1 to the pressure measuring points 2 is ensured to be consistent, and a pressure difference transmitter 3 is installed between two adjacent pressure measuring points 2 and is used for measuring the pressure difference at the pressure measuring points 2 of the two adjacent pulverized coal pipelines 4; the horizontal sections of the pulverized coal pipelines 4 are provided with resistance regulators 5.
Fluid air-powder, i.e. the mixture of coal powder and conveying medium air, generates energy loss when passing through the resistance regulator, and the energy loss comprises kinetic energy loss along the coal powder pipeline and kinetic energy loss caused by gravity in the vertical direction: when the device is arranged at the horizontal section, the diameter of the pulverized coal pipeline is small (generally about 0.4 m), the vertical loss caused by gravity is small, the front and back kinetic energy loss of the fluid through the resistance regulator is small in the horizontal forward movement process, and the influence on the movement speed of the fluid is small; when the device is arranged at a vertical section, in the process that fluid rises in the vertical direction, as the pulverized coal pipeline in the vertical direction is longer (generally more than 3 m), the energy loss caused by gravity is very large, 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.
The utility model discloses a real-time levelling device of wind powder's working process does:
s1, setting the opening degree of the resistance regulator 5 to be 80% of the maximum opening degree; a pressure difference set value for primary air flow balance 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 the two corresponding adjacent pressure measuring points 2 by using the pressure difference transmitter 3;
s3, the control module 7 sends an adjusting instruction to the resistance regulator according to the pressure difference measured in the step S2, and the opening degree is adjusted until the pressure difference is smaller than the pressure difference set value.
And when the load of the coal mill separator 1 changes, the air powder flow velocity and flow 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 air powder in the coal powder pipelines 4 is balanced.
The utility model discloses in the fluid equation derivation that uses as follows:
firstly, in order to facilitate formula derivation and calculation, under the premise of not affecting the calculation result, the following two assumptions are made:
1. neglecting the influence of the coal powder on primary air, and regarding the air-powder mixture as a single viscous fluid;
the coal powder has a true density of about 1000kg/m3And the mass ratio of wind to coal in the pulverized coal pipeline 4 is 2: 1 or so, calculating that the volume of the coal powder in the air-powder mixture is 0.05 percent, and neglecting the influence of the coal powder due to the small volume proportion.
2. The wind-powder mixture is an incompressible fluid;
the air is compressible gas, but the pressure measuring point 2 has a pressure change value of only 300-400 pa relative to primary air pressure in the coal mill separator 1 and is only 0.3% -0.4% of the absolute pressure of the primary air, so the air-powder mixture is considered to be incompressible fluid by neglecting volume change.
Referring to fig. 3, the present embodiment is provided with two pulverized coal pipelines 4, a pulverized coal pipeline a and a pulverized coal pipeline B, and correspondingly, a pulverized coal pipeline a resistance regulator 5 and a pulverized coal pipeline B resistance regulator 5 are respectively provided on a horizontal section of the pulverized coal pipeline a; setting a contact surface of a coal mill separator 1 and a pulverized coal pipeline 4 as a reference section 0, setting a plane where a pressure measuring point 2 is located as the reference section 1, and setting a contact surface of the pulverized coal pipeline 4 and a boiler 6 as the reference section 2;
wherein,
the meaning of each parameter symbol is:
z is potential energy, V is fluid flow velocity, P is static strength at the reference section, △ P is resistance loss from the reference section to the cross section of the separator of the coal mill, rho is fluid density, and g is gravity acceleration;
subscript notation:
a is a pulverized coal pipeline A, B is a pulverized coal pipeline B, M is the section of a separator of the coal mill, 0 is a section of 0, and 1 is a section of 1;
the parameter symbols are applied in combination with subscript symbols, for example: pA0Is the static pressure, Z, at the reference section 0 in the pulverized coal pipeline AmPotential energy at the separator of the coal mill, PMIs static strength of the cross section of the separator of the coal mill, VmIs the fluid flow velocity V at the section of the separator of the coal millAIs the fluid flow velocity, delta P, in the pulverized coal pipeline AA0Is the loss of resistance, Δ P, from reference section 0 in the pulverized coal pipeline A to the cross section of the coal pulverizer separatorA1The resistance loss from a reference section 1 in the pulverized coal pipeline A to the section of a separator of the coal mill is obtained; similarly, the lower corner labeled B represents the corresponding value in the pulverized coal pipe B.
The Bernoulli equation for viscous fluids for pulverized coal pipelines A and B holds as follows:
the pulverized coal pipes are uniformly and symmetrically arranged on the separator, and the sizes of the pulverized coal pipes are the same, so that the resistance loss △ P at the section 0 isA0＝△PB0Similarly, the drag loss △ P at section 1 is the same due to the same size and arrangement of the conduits between section 0 and section 1A1＝△PB1. Therefore, the following equations 1 and 2 can be used to obtain
As can be seen from equation 3, as long as the static pressure value P at the cross section 1 is referred toA1＝PB1Proving the flow velocity V in the pulverized coal pipe A and the pulverized coal pipe BA＝VB(ii) a The primary air flow in each pulverized coal pipeline 4 is equal because the drift diameters of the pulverized coal pipelines 4 are the same; the coal dust concentration in the pulverizer separator 1 is uniform, so that the amount of coal dust entering the coal dust duct 4 is also uniform at this time.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
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 (3)
1. The utility model provides a real-time levelling device of wind powder which characterized in that includes: the coal mill separator (1) is connected with the boiler (6) through a plurality of pulverized coal pipelines (4);
a plurality of buggy pipeline (4) all are the type of falling U, include: the coal powder pipeline comprises two vertical sections and a horizontal section, wherein a pressure measuring point (2) is arranged on the vertical section of one end, close to the coal mill separator (1), of each coal powder 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 every two adjacent pressure measuring points (2); the horizontal sections are all provided with resistance regulators (5);
the device also 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 wind and powder real-time leveling device according to claim 1, wherein a plurality of said resistance regulators (5) are installed at the same position.
3. The wind-powder real-time leveling device according to claim 1, wherein a pressure difference set value capable of equalizing the primary wind flow in the pulverized coal pipeline (4) is preset in the control module (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820906529.3U CN208382222U (en) | 2018-06-12 | 2018-06-12 | A kind of wind powder real-time leveling device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820906529.3U CN208382222U (en) | 2018-06-12 | 2018-06-12 | A kind of wind powder real-time leveling device |
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| Publication Number | Publication Date |
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| CN208382222U true CN208382222U (en) | 2019-01-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201820906529.3U Withdrawn - After Issue CN208382222U (en) | 2018-06-12 | 2018-06-12 | A kind of wind powder real-time leveling device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108644803A (en) * | 2018-06-12 | 2018-10-12 | 上海意丰机电科技开发有限公司 | A kind of wind powder real-time leveling device and leveling method |
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2018
- 2018-06-12 CN CN201820906529.3U patent/CN208382222U/en not_active Withdrawn - After Issue
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108644803A (en) * | 2018-06-12 | 2018-10-12 | 上海意丰机电科技开发有限公司 | A kind of wind powder real-time leveling device and leveling method |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20190115 Effective date of abandoning: 20230912 |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20190115 Effective date of abandoning: 20230912 |