CN104949717B - A kind of coal pulverizer inlet primary air measuring system - Google Patents
A kind of coal pulverizer inlet primary air measuring system Download PDFInfo
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- CN104949717B CN104949717B CN201510369193.2A CN201510369193A CN104949717B CN 104949717 B CN104949717 B CN 104949717B CN 201510369193 A CN201510369193 A CN 201510369193A CN 104949717 B CN104949717 B CN 104949717B
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Abstract
The invention discloses a kind of coal pulverizer inlet primary air measuring systems, including a cold air duct, a cold bellows, heat primary air road, mixed-rectification device and apparatus for measuring air quantity；A cold bellows are the divergent structure that upper end opening is small, lower ending opening is big, the upper end opening of a cold bellows is docked with a cold air duct, the lower ending opening of a cold bellows is connect with the outside wall surface in heat primary air road, and the part enclosed by cold First air luggage on heat primary air pipeline outer wall face is equipped with plus air port；Mixed-rectification device is located in heat primary air road, mixed-rectification device includes the more than one mixed-rectification component of spaced set, mixed-rectification component is in thin wall cavity structure, it is docked with air port is added one end of mixed-rectification component, the mixed-rectification component other end extends to plus the inner wall in the heat primary air road on air port opposite, and the wall surface of mixed-rectification component is equipped with exhaust vent；Apparatus for measuring air quantity is located at the downstream of mixed-rectification device in heat primary air road.The accuracy of coal pulverizer inlet primary air measuring of the present invention is significantly improved.
Description
Technical field
The present invention relates to a kind of coal pulverizer inlet primary air measuring systems, belong to thermal power plant's coal pulverizer field.
Background technology
Large-scale power station generally uses unit pulverized-coal system, that is, uses First air drying coal dust and carry to burner hearth, wherein
Mainly there are two sets of automatic loops to the control of First air, a set of is cold First air adjusting control circuit, primary by adjusting mixing
The ratio of cold blast rate achievees the effect that adjust a wind-warm syndrome in wind, meets the dry of coal dust and requires；Another set of is heat primary air tune
Control loop is saved, primary air flow is mainly adjusted, keeps suitable coal-air ratio, meet the band powder ability of First air.Above-mentioned control is returned
The accuracy of Lu Zhong, wind-warm syndrome and air measuring value is particularly important, is directly related to the quality automatically controlled.
With the progress of control technology, the load of station boiler, fuel quantity and with air quantity have been realized in on-line monitoring and
Coordinate control, but still have suitable multicomputer because apparatus for measuring air quantity type selecting or air duct arrange the reasons such as unreasonable at present, causes
It is accurate that coal pulverizer inlet ventilation quantity is difficult to measure, and boiler load, air quantity, fuel quantity can not be thrown automatically, in turn result in unstable combustion,
Boiler efficiency decline and coal pulverizer ventilation quantity it is insufficient and the problems such as block.
Power boiler air capacity measuring apparatus has air duct type venturi, wing, flute type pipe, Verabar, more larynx diameter venturi etc.,
Measuring condition required by all kinds of devices has differences, but there are one common ground, are required to residing flow field and stablize as possible.
Theory and practice proves, when apparatus for measuring air quantity is in steady flow condition, passes through the flow of sectional area where it
In a linear relationship with the square root of its pressure difference provided, apparatus for measuring air quantity is exactly to converse reality according to the pressure difference of its offer
Air quantity.Measuring cell used in boiler draft measurement is nonstandard element, and the calibration by standardization is needed before use, is determined
Its discharge coefficient.
Air measuring is carried out using above-mentioned principle, apparatus for measuring air quantity is required to and is in metastable flow field, and is flowed
The stabilization of field has inseparable relationship, conventional technique scheme with the arrangement in air duct to be stayed in the upstream of apparatus for measuring air quantity
Enough straight pipes, flow field tends to opposite stabilization to wind by straight pipe.
If not considering flow field stabilization measuring device also to be required to accurately reflect the variation of air quantity to be unpractical.Here it is
The problems of station boiler air measuring root at present is often limited by site layout project space, can not arrange long enough
Straight pipe, cause at apparatus for measuring air quantity flow field disorderly.
Theory and practice is also shown that hot and cold wind blending unevenness is to cause most thermal power plant's coal pulverizer inlet air quantity not
Even there is apparatus for measuring air quantity and shows that flow and baffle opening variation are special sometimes in accurate and poor dynamic another major reason
The opposite phenomenon of property.
It is accurate to measure coal pulverizer inlet primary air flow, it both needs to ensure that the taken dynamic pressure of apparatus for measuring air quantity is accurate, it is also necessary to
Accurate wind-warm syndrome value corrects airflow value.
The apparatus for measuring air quantity of coal pulverizer is typically located at the downstream of hot and cold First air mixing, and cold First air and heat one
Secondary wind vertically crosses, and the flow field uniformity and temperature uniformity at apparatus for measuring air quantity are relatively difficult to guarantee.In not enough straight pipes
In the case of, the accurate difficulty for measuring coal pulverizer inlet air quantity is very big.
In order to obtain steady flow condition and temperature field on straight pipe short as possible, cowling panel or rectification are often set in air duct
Grid, this is a kind of effective means, but needs to pay the cost for increasing duct resistance, increases equipment operating cost.
Just because of above-mentioned various reasons, thermal power plant's coal pulverizer inlet primary air measuring system reliability is relatively low at present, no
The requirement that boiler automatic control system can be met influences safety and the economy of generating set operation.
Invention content
The present invention provides a kind of coal pulverizer inlet primary air measuring system, and hot and cold First air can be made to be uniformly mixed, stream
Field and Uniformity of Temperature Field greatly improve, and the stability and accuracy to make coal pulverizer inlet air measuring greatly improve, and
Duct resistance is not will increase, equipment operating cost is low.
In order to solve the above technical problems, the technical solution adopted in the present invention is as follows：
A kind of coal pulverizer inlet primary air measuring system, including a cold air duct, a cold bellows, heat primary air road,
Mixed-rectification device and apparatus for measuring air quantity；
A cold bellows are upper end opening is small, lower ending opening is big divergent structure, the upper end opening of a cold bellows with it is cold
Air duct docking, the lower ending opening of a cold bellows is connect with the outside wall surface in heat primary air road, on heat primary air pipeline outer wall face
The part enclosed by cold First air luggage is equipped with plus air port；
Mixed-rectification device is located in heat primary air road, and mixed-rectification device includes that the more than one mixing of spaced set is whole
Component is flowed, mixed-rectification component is in thin wall cavity structure, and one end of mixed-rectification component is docked with air port is added, mixed-rectification component
The other end extends to plus the inner wall in the heat primary air road on air port opposite, and the wall surface of mixed-rectification component is equipped with exhaust vent；
Apparatus for measuring air quantity is located at the downstream of mixed-rectification device in heat primary air road；
Cold First air enters from a cold air duct, successively through supercooling First air case, mixed-rectification component cavity after, from mixed
The exhaust vent for closing rectifier stack enters heat primary air road.
For above-mentioned mixed-rectification component with a cold bellows by adding air port to be connected to, one end of connection is mixed-rectification component
Air inlet.It is multiple to be uniformly distributed in heat primary air road, you can to regard each mixing as when mixed-rectification component is multiple
Rectifier stack is inserted in the center of passage aisle respectively.
On above-mentioned heat primary air pipeline outer wall face plus air port quantity is equal with mixed-rectification component count, and one is a pair of
It answers.
The smaller one end (upper end opening) of an above-mentioned cold bellows flow area is air intake vent, connects a cold air duct；It is logical
Larger one end of flow area (lower ending opening) is air outlet, is connected to the air inlet of mixed-rectification component, realizes a cold air duct
Transition between heat primary air road is connect.
Using above-mentioned technical proposal, hot and cold First air is uniformly mixed, and Flow and heat flux uniformity greatly improves, to
The stability and accuracy for making coal pulverizer inlet air measuring greatly improve, boiler milling system, combustion system economy with
Stability is improved therewith, and not will increase duct resistance, and equipment operating cost is low.
Apparatus for measuring air quantity includes the calculating of the multipoint mode apparatus for measuring air quantity, pressure difference transmitter, DCS system of sequence connection
Machine and electric thermo-couple temperature measuring point, wherein the end of multipoint mode apparatus for measuring air quantity and the end of electric thermo-couple temperature measuring point are stretched into
In heat primary air road, and electric thermo-couple temperature measuring point is located at the downstream of multipoint mode apparatus for measuring air quantity.
It is to be connected by the tracheae of two different pressures between multipoint mode apparatus for measuring air quantity and pressure difference transmitter, specifically
It can refer to the prior art.
Above-mentioned multipoint mode apparatus for measuring air quantity is designed based on backing tube principle, and there are multiple pressure tappings in windward side, is obtained dynamic
Flatten mean value；Leeward has multiple pressure tappings, static pressure average value is obtained, according to the pressure difference between dynamic pressure and static pressure, in conjunction with scene
Rating test can converse the accurate air quantity of coal pulverizer inlet, and specific conversion is with reference to the prior art.
The space layout principle of multipoint mode apparatus for measuring air quantity is ensuring that one group of pressure tappings is corresponding with a passage aisle, phase
When the dynamic pressure in each passage aisle of independent measurement is averaged again, to obtain accurate air quantity.
The location matches relationship of above-mentioned multipoint mode apparatus for measuring air quantity and mixed-rectification device reduces convection current field stability
It is required that the occasion especially suitable for site layout project limited space.Using above-mentioned arrangement, multipoint mode apparatus for measuring air quantity is mixed
It closes at about one meter of rectifier downstream, flow field tends to be relatively stable, can get stable dynamic pressure value, to accurately measure coal-grinding
Machine entrance primary air flow.
Due to carrying flying dust in heat primary air, multipoint mode apparatus for measuring air quantity, which blocks up ash, in order to prevent causes measured value inaccurate,
Deashing needle is inserted into from above-mentioned windward side pressure tappings, deashing needle plays pendulum under airflow function, can clear up in real time
The dust stratification of apparatus for measuring air quantity inner wall.
Since the mixing First air Temperature Distribution after mixed-rectification device tends to be uniform, single thermocouple measurements have
Representativeness, and the stability of wind-warm syndrome measured value greatly improves, therefore the amendment precision of air measuring value can be improved, ensure airflow value
Accuracy.
In order to easy to make, and ensure sufficiently long service life, above-mentioned multipoint mode apparatus for measuring air quantity stainless steel square
Pipe makes, and windward side pressure tappings are bezel designs.
The end of above-mentioned multipoint mode apparatus for measuring air quantity and the end of electric thermo-couple temperature measuring point are stretched into heat primary air road.
The differential pressure signal of multipoint mode apparatus for measuring air quantity is changed into current signal by above-mentioned differential pressure transmitter, accesses computer；Temperature is surveyed
Point is arranged in the downstream of multipoint mode apparatus for measuring air quantity, and the current signal for representing wind-warm syndrome also accesses computer；Computer is according to upper
The air volume coefficient for stating two current signals and air flow calibration experiment calculates coal pulverizer inlet primary air flow, circular
For the prior art.
Mixed-rectification component includes two wall surfaces being oppositely arranged, and wall surface is arranged in parallel with heat primary air flow direction.This
Sample arrangement will not cause heat primary air flow resistance to increase.
Mixed-rectification component includes two rectangle wall surfaces being oppositely arranged, and two rectangular wall interplanar distances are 50~200mm；Outlet air
Hole is there are two more than and is uniformly located on rectangle wall surface.It further ensure that the mixing of heat primary air and cold First air in this way
Uniformity.
Shim is equipped between two wall surfaces of mixed-rectification component, the cavity of mixed-rectification component is divided into two by shim
A above independent aerated area, each aerated area have independent air inlet and exhaust vent, the air inlet of each aerated area
Mouth is all individually connected to a cold bellows, and the air inlet of all aerated areas is in the same plane.
The setting of above-mentioned shim, primarily to the air quantity of exhaust vent is evenly distributed, the outlet air of certain amount (one group)
Hole corresponds to the air inlet of certain area, evenly distributes, and just can guarantee that the air quantity of every group of exhaust vent is roughly equal, to ensure cold one
Secondary wind is more uniformly mixed into heat primary air；Above-mentioned shim also acts as the work for positioning above-mentioned mixed-rectification component walls interplanar distance
With to ensure structural stability.
It it is from top to bottom one group when above-mentioned exhaust vent is arranged vertically；It it is from left to right one group when horizontally disposed；It is aforementioned to hang down
Straight arrangement, which refers to, from top to bottom arranges multiple exhaust vents along a vertical line, it is horizontally disposed refer to by multiple exhaust vents along a horizontal line by
Left-to-right is arranged.
Two groups of exhaust vents are set on each mixed-rectification component, two groups of exhaust vents are gone to upper and lower along heat primary air flow direction
Trip arrangement.It can further ensure the mixing uniformity of cold First air and heat primary air in this way.Above-mentioned exhaust vent can be circle
Hole or strip hole.
It is preferred that two groups of exhaust vents are strip, exhaust vent and heat primary air flow direction are perpendicular or parallel.
In order to reduce the drag losses of heat primary air flowing to the greatest extent, length direction and the heat primary air of above-mentioned strip hole flow
Direction (mainstream flow direction) is consistent.Since mixed-rectification component wall surface and mainstream flow direction are in be arranged substantially in parallel relationship,
So being vertical incision heat primary air by the cold First air sprayed in strip hole.
It is preferred that the width of exhaust vent is 15~30mm；The gross area of all exhaust vents of each mixed-rectification component is more than
The gross area of air inlet.
The length and distribution density of exhaust vent are depending on air inlet flow area.Above-mentioned each mixed-rectification component
The gross area of all exhaust vents is more than the gross area of air inlet, can reduce the flowing of heat primary air and cold First air to greatest extent
Drag losses.
In order to enhance the uniformity of hot and cold wind mixing, it is located at length direction and the heat primary air flowing side of upstream exhaust vent
To vertical, the length direction for being located at downstream exhaust vent is consistent with heat primary air flow direction.
When above-mentioned strip hole length direction is arranged as vertical with mainstream flow direction, in order to reduce heat primary air stream to the greatest extent
Dynamic drag losses, strip hole are processed as shutter nozzle arrangements, and the angle of the cold First air and main flow direction that make ejection is sharp
Angle.The acute angle is smaller, and the drag losses of heat primary air flowing are smaller.
In order to better ensure that the uniformity of hot and cold wind mixing, mixed-rectification component have 3 or 4.
Total flow area of above-mentioned air inlet is preferably greater than the sectional area in a cold air duct, is hindered with reducing a cold wind flow
Power is lost.
Above-mentioned mixed-rectification component and a cold bellows can be made by general steel plate, and easy to make.
The unmentioned technology of the present invention is with reference to the prior art.
A kind of coal pulverizer inlet primary air measuring system of the present invention, makes hot and cold First air be uniformly mixed, flow field and temperature
Field uniformity greatly improves, and the stability and accuracy to make coal pulverizer inlet air measuring greatly improve, boiler powder system
System, the economy of combustion system and stability are improved therewith, and not will increase duct resistance, and equipment operating cost is low.
Description of the drawings
Fig. 1 is air duct layout drawing of coal pulverizer inlet in the prior art.
Fig. 2 is a kind of schematic diagram of 1 coal pulverizer inlet First air measuring system of the embodiment of the present invention.
Fig. 3 is the feature schematic diagram of Section A-A in Fig. 2.
Fig. 4 is the sectional view of section B-B in Fig. 2.
Fig. 5 is that the embodiment of the present invention 1 sees layout drawing of the mixed-rectification device in heat primary air road from cold First air flow direction.
Fig. 6 is the enlarged drawing of single passage aisle in Fig. 5.
Fig. 7 is a kind of schematic diagram of 2 coal pulverizer inlet First air measuring system of the embodiment of the present invention.
Fig. 8 is that the embodiment of the present invention 2 sees layout drawing of the mixed-rectification device in heat primary air road from cold First air flow direction.
Fig. 9 is the enlarged drawing of single passage aisle in Fig. 8.
Figure 10 is that certain power plant's hot wind main pipe resistance between being grinding into mouth is grinding into the relational graph that mouth shows air quantity with dial plate.
In figure, 1 is a cold air duct, and 2 be heat primary air road, and 3 be cold First air (flow direction), and 4 be heat primary air (flow direction),
5 be former apparatus for measuring air quantity, and 6 be mixing First air (flow direction), and 7 be coal pulverizer inlet, and 8 be coal pulverizer, and 9 survey for multipoint mode air quantity
Device is measured, 10 be a cold bellows, and 11 be mixed-rectification device, and 12 be horizontal subdivision piece, and 13 be vertical shim, and 14 be outlet air
Hole, 15 be the wall surface of mixed-rectification component, and 16 be the passage aisle divided equally, and 17 be first group of exhaust vent (upstream), and 18 be second group
Exhaust vent (downstream), 19 be the strip hole arranged vertically, and 20 strip holes being arranged horizontally, 21 be to be sprayed from first group of exhaust vent
The cold First air air-flow gone out, 22 be the cold First air air-flow ejected from second group of exhaust vent, and 23 be pressure tappings, and 24 be deashing
Needle, 25 be one group of pressure tappings corresponding with passage aisle, and 26 be temperature point (thermocouple), and 27 be differential pressure transmitter, and 28 be calculating
Machine (DCS system).
Specific implementation mode
For a better understanding of the present invention, with reference to the embodiment content that the present invention is furture elucidated, but the present invention
Content is not limited solely to the following examples.
Embodiment 1
Coal pulverizer inlet primary air measuring system as figures 2-6, including a cold air duct, cold bellows, a heat
Air duct, mixed-rectification device and apparatus for measuring air quantity；
Heat primary air road is rectangular duct, horizontally disposed, and sectional dimension is 1.5m × 1.2m (horizontal directions, that is, width direction
It is 1.2m for 1.5m, vertical direction, that is, depth direction)；A cold air duct is also rectangle, vertical to arrange, sectional dimension 0.6 ×
0.6m；
A cold bellows are upper end opening is small, lower ending opening is big divergent structure, the upper end opening of a cold bellows with it is cold
Air duct docking, the lower ending opening of a cold bellows is connect with the outside wall surface in heat primary air road, on heat primary air pipeline outer wall face
The part enclosed by cold First air luggage is equipped with plus air port；A cold bellows are made of 5mm general steel plates；
Mixed-rectification device is located in heat primary air road, and mixed-rectification device includes 3 mixed-rectification components of spaced set,
Mixed-rectification component is in thin wall cavity structure, and one end of mixed-rectification component is docked with air port is added, the mixed-rectification component other end
It extends to plus the inner wall in the heat primary air road on air port opposite, the wall surface of mixed-rectification component is equipped with exhaust vent；Adjacent two mixing is whole
The spacing for flowing component is 500mm, above-mentioned heat primary air road is divided into the passage aisle of 3 0.5m × 1.2m in the width direction, then
Each mixed-rectification component is exactly in the middle position of passage aisle；
Each mixed-rectification component includes two rectangle wall surfaces being oppositely arranged, and wall surface is parallel with heat primary air flow direction
Arrangement, two rectangular wall interplanar distances are 100mm, form cavity structure；Exhaust vent is there are two more than and is uniformly located at rectangle wall surface
On；Two rectangle wall surfaces are arranged in parallel, and rectangle wall surface is sheet metal with holes, planar dimension 2m × 1.2m, thickness 5mm, thin steel with holes
It is substantially in parallel relation that the wall surface of plate is flowed to heat primary air；Exhaust vent is offered on sheet metal, exhaust vent is arranged horizontally
Long lumbar hole, long lumbar hole size be 16mm × 300mm, adjacent long lumbar hole spacing be 80mm, totally two groups, every group 15, two groups of edges
Heat primary air flow direction goes to upper and lower trip arrangement.
Shim, including horizontal subdivision piece and vertical shim are also set up in the cavity of above-mentioned mixed-rectification component, complete
Whole cavity is divided into multiple aerated areas, and each aerated area has independent air inlet and exhaust vent, each aerated area
Air inlet be all individually connected to a cold bellows, the air inlet of all aerated areas in the same plane, mixed-rectification component
All exhaust vents the gross area be more than air inlet the gross area；This design ensures that every 5 exhaust vents correspond on depth direction
The air inlet of certain area, and air-admitting surface is evenly dividing according to total flow area, using the above scheme, ensures depth
Cold First air distribution is generally uniform on direction.
Above-mentioned shim also uses steel plate to make, and thickness 5mm is welded on the inside of mixed-rectification component, to opposite two
Block sheet metal with holes is positioned and is reinforced, and ensures integrally-built stability；
Cold First air enters from a cold air duct, successively through supercooling First air case, mixed-rectification component cavity after, from mixed
The exhaust vent for closing rectifier stack enters heat primary air road；
Apparatus for measuring air quantity is located at the downstream about 1m of mixed-rectification device in heat primary air road；
Apparatus for measuring air quantity includes the calculating of the multipoint mode apparatus for measuring air quantity, pressure difference transmitter, DCS system that are linked in sequence
Machine and electric thermo-couple temperature measuring point, wherein the end of multipoint mode apparatus for measuring air quantity and the end of electric thermo-couple temperature measuring point are stretched into
In heat primary air road, and electric thermo-couple temperature measuring point is located at the downstream of multipoint mode apparatus for measuring air quantity；Multipoint mode apparatus for measuring air quantity,
Every 5 windward pressure tappings be one group, be arranged 3 groups, amount to 15 pressure tappings windward；Above-mentioned every group of pressure tappings correspond to one small logical
Road, using the dynamic pressure in the grid survey channel, the average dynamic pressure in 3 channels is pooled to a bit again；Above-mentioned multipoint mode air quantity is surveyed
Amount device measures the average dynamic pressure of entire flow section, connects differential pressure transmitter, current signal is re-fed into computer (DCS system)；
It is sent into the current signal of the temperature point (thermocouple) for also having apparatus for measuring air quantity downstream of computer (DCS system), root simultaneously
It is primary that coal pulverizer inlet may be implemented in conjunction with the air volume coefficient that air flow calibration test result determines according to above-mentioned two current signal
The accurate measurement of air quantity；
Above-mentioned multipoint mode apparatus for measuring air quantity is made of stainless steel square pipe, and sectional dimension is 30mm × 30mm × 2mm, is met
The bezel designs angle of wind face pressure tappings is 60 °；It is inserted into stainless steel deashing needle, deashing needle diameter 4mm from pressure tappings.
Comparative example 1
The primary air piping deployment scenarios of coal pulverizer inlet in the prior art as shown in Figure 1, a cold air duct directly with heat one
Secondary air duct is connected, and causes cold First air that cannot be uniformly mixed with heat primary air (laminar flow), flow velocity is inclined on same flow section
Difference, temperature deviation are larger, lead to that coal pulverizer inlet air measuring is inaccurate, poor reliability, so influence boiler milling system,
The economy and stability of combustion system.
(as described in above-mentioned comparative example 1) is not allowed in certain power plant coal entrance primary air measuring, using above-described embodiment 1
After technical solution implements transformation, the stability and accuracy of air measuring greatly improve.In order to examine correctional effect, carry out
Heat primary air tradition of a family flow characteristic is tested：Keep cold main air intake aperture and coal-supplying amount constant, heat primary air door takes 8 apertures, point
Not Wei 100/90/80/70/60/55/50/45 (%), and record heat primary air main pipe between coal pulverizer inlet resistance and
Dial plate is grinding into mouth and shows air quantity.Should be in linear pass strictly according to Hydrodynamics Theory, between above-mentioned resistance and actual air volume
System, due to can accurately measure above-mentioned resistance, (heat primary air main pipe static pressure and the difference for grinding input static pressure, static pressure measurement is not by flow field
Stability influence), therefore the linearity deviation between above-mentioned resistance and display air quantity can reflect air measuring system itself
Precision
According to above-mentioned principle, heat primary air door under 8 apertures (100%~45%) heat primary air main pipe to coal pulverizer
Resistance between entrance is grinding into mouth with dial plate and shows that the relationship between air quantity is as shown in Figure 10, is fitted by 8 operating points straight
Line is：Y=-0.0241x+108.37.Wherein, x is hot wind main pipe to being grinding into a mouthful crushing, unit Pa；Y is grinding into mouth for dial plate and shows
Air quantity, unit t/h.
| Heat primary air door aperture | % | 100 | 90 | 80 | 70 | 60 | 55 | 50 | 45 |
| Hot wind main pipe is to being grinding into a mouthful crushing | Pa | 399 | 412 | 427 | 489 | 629 | 737 | 869 | 1043 |
| Dial plate is grinding into mouth and shows air quantity | t/h | 98.86 | 98.67 | 98.06 | 96.85 | 92.89 | 90.30 | 87.11 | 83.78 |
| Dial plate is grinding into mouth fitting air quantity | t/h | 98.75 | 98.45 | 98.09 | 96.59 | 93.21 | 90.60 | 87.42 | 83.23 |
| Air measuring system precision | % | 0.11 | 0.23 | -0.03 | 0.28 | -0.35 | -0.32 | -0.36 | 0.65 |
By upper table analysis it is found that the present invention can improve the precision of coal pulverizer inlet primary air measuring system to deviation
Less than ± 1%.
Embodiment 2
As shown in figs. 7-9, embodiment 2 is similar with the technical solution of embodiment 1, except that first group of air outlet
Length direction is vertical with mainstream flow direction, and strip hole is processed as shutter nozzle arrangements, makes cold First air and the master of ejection
The angle for flowing direction is acute angle, is conducive to the uniformity for improving hot and cold First air mixing, every group of shutter nozzle is by 8 blinds
Composition, the angle with main flow direction is 30 ° or so；Two groups of exhaust vents are located at the length direction and heat primary air of upstream exhaust vent
Flow direction is vertical, and the length direction for being located at downstream exhaust vent is consistent with heat primary air flow direction.
Claims (6)
1. a kind of coal pulverizer inlet primary air measuring system, it is characterised in that：Including a cold air duct, cold bellows, a heat
Air duct, mixed-rectification device and apparatus for measuring air quantity；
A cold bellows are upper end opening is small, lower ending opening is big divergent structure, the upper end opening of a cold bellows with it is cold primary
Air duct is docked, and the lower ending opening of a cold bellows is connect with the outside wall surface in heat primary air road, cold on heat primary air pipeline outer wall face
The part that First air luggage encloses is equipped with plus air port；
Mixed-rectification device is located in heat primary air road, and mixed-rectification device includes the more than one mixed-rectification group of spaced set
Part, mixed-rectification component are in thin wall cavity structure, and one end of mixed-rectification component is docked with air port is added, and mixed-rectification component is another
End extends to plus the inner wall in the heat primary air road on air port opposite, and the wall surface of mixed-rectification component is equipped with exhaust vent；
Apparatus for measuring air quantity is located at the downstream of mixed-rectification device in heat primary air road；
Cold First air enters from a cold air duct, whole from mixing successively after the cavity of First air case, mixed-rectification component is subcooled
The exhaust vent of stream component enters heat primary air road；
Apparatus for measuring air quantity include sequence connection multipoint mode apparatus for measuring air quantity, pressure difference transmitter, DCS system computer and
Electric thermo-couple temperature measuring point, wherein heat one is stretched into the end of multipoint mode apparatus for measuring air quantity and the end of electric thermo-couple temperature measuring point
In secondary air duct, and electric thermo-couple temperature measuring point is located at the downstream of multipoint mode apparatus for measuring air quantity；
Mixed-rectification component includes two rectangle wall surfaces being oppositely arranged, and two rectangular wall interplanar distances are 50~200mm, rectangle wall surface
It is arranged in parallel with heat primary air flow direction；Exhaust vent is there are two more than and is uniformly located on rectangle wall surface；
Between two wall surfaces of mixed-rectification component be equipped with shim, shim the cavity of mixed-rectification component be divided into two with
Upper independent aerated area, each aerated area have independent air inlet and exhaust vent, the air inlet of each aerated area
It is individually connected to a cold bellows, the air inlet of all aerated areas is in the same plane.
2. coal pulverizer inlet primary air measuring system as described in claim 1, it is characterised in that：Each mixed-rectification component
Two groups of exhaust vents of upper setting, two groups of exhaust vents go to upper and lower trip arrangement relation along heat primary air flow direction.
3. coal pulverizer inlet primary air measuring system as claimed in claim 2, it is characterised in that：Two groups of exhaust vents are length
Bar shaped, exhaust vent and heat primary air flow direction are perpendicular or parallel.
4. coal pulverizer inlet primary air measuring system as claimed in claim 3, it is characterised in that：The width of exhaust vent is 15
~30mm；The gross area of all exhaust vents of each mixed-rectification component is more than the gross area of air inlet.
5. coal pulverizer inlet primary air measuring system as claimed in claim 2, it is characterised in that：Positioned at upstream exhaust vent
Length direction is vertical with heat primary air flow direction, is located at length direction and the heat primary air flow direction one of downstream exhaust vent
It causes；Exhaust vent positioned at upstream is processed as shutter nozzle arrangements.
6. coal pulverizer inlet primary air measuring system as described in claim 1, it is characterised in that：Multipoint mode air measuring fills
The space layout principle set is to ensure that one group of pressure tappings is corresponding with a mixed-rectification component.
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| CN201510369193.2A CN104949717B (en) | 2015-06-29 | 2015-06-29 | A kind of coal pulverizer inlet primary air measuring system |
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| CN201510369193.2A CN104949717B (en) | 2015-06-29 | 2015-06-29 | A kind of coal pulverizer inlet primary air measuring system |
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| CN105618244A (en) * | 2016-03-17 | 2016-06-01 | 苏州西热节能环保技术有限公司 | Primary air flow mixing and equilibrating device for round air duct of coal mill inlet |
| CN105953832B (en) * | 2016-04-27 | 2018-06-15 | 东南大学 | Air quantity wind-warm syndrome measuring method in a kind of coal pulverizer inlet primary air duct and pipeline |
| CN108855573B (en) * | 2018-07-11 | 2020-03-24 | 上海电气上重碾磨特装设备有限公司 | CFD technology-based coal mill inlet air duct flow field improvement method and structure |
| CN112050888A (en) * | 2020-07-15 | 2020-12-08 | 华电电力科学研究院有限公司 | System and method for measuring inlet air volume of coal mill of pulverizing system |
| CN112452521B (en) * | 2020-11-05 | 2022-09-13 | 西安热工研究院有限公司 | Method for calibrating air volume coefficient of medium-speed coal mill inlet |
| CN113218460A (en) * | 2021-05-21 | 2021-08-06 | 京仪股份有限公司 | Air volume measuring structure based on flow equalizing technology |
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| CN102853867A (en) * | 2012-09-18 | 2013-01-02 | 黑龙江省电力科学研究院 | Flow-equalizing self-stabilization air quantity measuring device |
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| CN102853867A (en) * | 2012-09-18 | 2013-01-02 | 黑龙江省电力科学研究院 | Flow-equalizing self-stabilization air quantity measuring device |
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