First, the new flowmeter starts in the cement profession to
apply
In the chemical industry, petrifies profession each kind
of flowmeter application and so on the steel and iron, electric power,
heating and water treatment is extremely common, uses in to survey
each kind of liquid and the gas current capacity. Unceasingly
enhances along with the industry domain convection 量测 quantity
request, appeared each kind of new flowmeter in the market, they
according to differently survey the mechanism crown by to decorate the
terminology, like cauri Ollie, the ultrasonic wave, the
electromagnetism, 涡街 the flowmeter and so on, compares traditional
the volume type, the venturi tube, the mechanical hole beat flowmeter
comes, the new flowmeter has a more novel characteristic, in the
precision, the reliability, the duplication, the maintainable aspect
and the old style flowmeter compares has the remarkable difference, in
these equipment, is easy the active part which wears to be very few or
basic does not have; In flowmeter majority of all rights and
wrongs invasion type part, has a smaller pressure drop and a better
security; West very many measuring appliances the oneself has
the microprocessor, can carry out from the diagnosis and other
functions, thus can provide the real-time feedback and the history
data acquisition for the user.
Relative other professions, each kind of flowmeter in cement
industry application less, this is because in the production
technological process the main medium is the material flows with the
air current, flows in the material by is powdery and the pellet
primarily, the liquid material flows in the host technical process
nearly does not have, but the air current also has the certain dust,
and is passes in the big pipeline, it gives the flow measurement to
bring the very great difficulty. Although in certain craft
spots, if refrigerator various rooms amount of wind, because
determines is the compressed air current capacity, the pipeline
caliber is not big, generally with the traditional venturi tube, may
survey through the difference pressure, but because measuring accuracy
low, the flow rate only can take the reference, moreover adjusts the
air throttle with it to open, the constant amount of wind is also more
difficult, at present some daily production 5,000 ton production lines
have not surveyed the compressed air the current capacity, but is the
electric power which outputs through the determination high pressure
Luo tribulus air blower estimates the current capacity.
Therefore the flow measurement in the past in the cement
profession nearly was a blank, the automation technical personnel
often only knows the temperature, the pressure, measurement sensor and
so on position. Increases, the technological process along with
the cement production scale unceasingly renews, the flow measurement
and the new flowmeter also start in the cement profession application.
1. big pipelines gas flow amount survey.
Early introduction some violate the law the cement production
line, the overseas company proposed examines the gas flow amount and
the corresponding adjustment related valve in kiln tail 出口?and
in the waste gas processing big pipeline, once has selected the hole
beat flowmeter, the flute shape fast pipe flow gauge and so on, but in
the use process the difficulty too is big, because the flow
measurement certainly does not affect the cement the production,
latter has not always used. Along with the cement craft and the
scale unceasing renewal, large-scale stands rubs obtained the
universal application, in sets up in the technical process which rubs,
the request determination grinding machine import and export amount of
wind and the maintenance circulation amount of wind is constant, if
our country exports Aman the daily production 3,300 tons cement
production line, used the extraordinary company to stand rubs, had
this request in the measuring point data sheet, the daily production
3,000 tons levels cement production line crude material rubs the rumor
tube caliber generally about 800 millimeters. In the flow
measurement standard, the pipeline caliber is bigger than 200
millimeters to belong to the heavy-caliber flow measurement, like with
traditional hole beat flowmeter, in movement, because the orifice
throttle 锐边 attrition, the pan tarnish, the pipeline agglomeration
congeals the ash, needs to carry on the replacement after the
attrition; The orifice well tester also has the measuring range
slightly, the precision is lower than, cannot restore the pressure to
damage and so on the shortcoming in a big way; Needs the big
flange regarding the heavy-caliber pipeline, its price, installs the
cost and the maintenance also is worth the matter of concern.
Moreover the gas flow measurement the temperature, the pressure
change is changed, it can have the serious influence to the gas flow
measurement, mainly displays in the precision and the duplicated
aspect; In the cement profession was measured the process gas
mostly includes the dust, surveys in the sensor generally to have the
eyelet, the dust can be easy to create surveys the sensor stopping up,
therefore is big in the cement profession big pipeline gas flow amount
survey difficulty, some many questions wait for the solution.
Appeared along with the new differential pressure type fast pipe
flow gauge in the market, has solved the big pipeline gas flow amount
survey difficult problem, it has the measuring range in a big way, the
precision is higher than, cannot restore the pressure to damage the
young characteristic, also the passable each kind of measure has
guarded against in the gas the dust to stop up surveys the sensor.
This article key introduction new differential pressure type
fast pipe flow gauge principle of work, basic structure, performance
characteristic and application and so on.
2. new flow measurements mechanism uses in the cement
technological process material survey.
In the cement technological process the raw material, the middle
end product and the final product all are a solid, moreover by
granulated and powdery material primarily, these materials flow
measurements in the cement factory are, they which realizes by the
electronic skin belt weight meter and each kind of solid flowmeter not
only are the process unit also are the automatic equipment, but does
not belong to the current capacity measuring appliance. In the
last few years the overseas some companies the new current capacity
measuring appliance survey mechanism, like cauri Ollie, the ultrasonic
wave use in to measure to state that, the most typical example is the
German 申克 company cauri Ollie which develops with the cauri Ollie
strength survey mass flow mechanism stated, surveys the powdered coal
with it to compare other powdered coal measurements to state, has the
structure simple, the control precision is high, characteristic and so
on measurement and transportation integration, already widely applied
in our country cement profession, domestic some enterprises also
useful cauri Ollie developed the measurement stated, but various
aspects target was inferior to much 申克 product.
3. uses the new flowmeter in the assistance flow.
Mainly uses in the cement industry auxiliary flow to enhance the
equipment revolution rate and the protection device, if in the waste
gas processing flow humidifies the spraying of water is for increase
the dust the resistivity, thus enables the electricity dust catcher
the efficiency to enhance. In new violates the law the cement
plant all to be equipped with the spraying of water automatic control
return route, various factories has established the electromagnetic
flowmeter in the water volume control, some also disposed has tied up
the type 超声?gauge, played the very good monitoring role, also
enabled the spraying of water automatic control return route the
normal operation.
2. new differential pressure types fast pipe flows gauge
The differential pressure type fast pipe flow gauge is
published in on century the end of 60's, it is based on the primary
vertical stroke advantage conservation of energy principle and the
pitot pickup measured the fast principle develops, the so-called pitot
pickup measured fast actually is in the measuring channel in the
circular pipe diameter or the rectangle (diamond) in the tube length
and the width several speeds of flow calculated through the
conservation of energy principle the current capacity one kind of
jack-in type current capacity measuring appliance, this circular pipe
or the diamond tube usually also name examines the measuring bar, we
often mention "the Arab League cow Pakistan flowmeter" (Annubar)
actually are the differential pressure type fast pipe flow gauge, is a
name also is a registered trademark. It because its structure
simple, installs, opens conveniently, the price is inexpensive and
merit and so on energy conservation, in is bigger than the caliber is
200 millimeters pipelines, often takes the operating mode monitoring
in some professions as the flow measurement first choice measuring
appliance, if in our country transport the natural gas from the west
to the east century project, in the skeleton line inside diameter is
on a meter pipeline, approximately 50% above flowmeter has used
Emerson Corporation the fast pipe flow gauge. But regarding the
cement profession special gas condition, we like must select the
differential pressure type fast pipe flow gauge, must have to consider
following several aspects:
1. provides the correct current capacity and the pipeline data.
The differential pressure type fast pipe flow gauge mechanical
size is according to the pipeline size quantity body which must
install has custom-made, its survey scope is the current capacity data
which provides according to the craft calculates and demarcates.
When we like must select, certainly must correctly provide to
the manufacturer current capacity data and the pipeline size, the
pipeline size including the outer diameter and wall thickness.
2. correct choices examines the measuring bar.
Differential pressure type fast pipe flow gauge its main
structure is an insertion examines the measuring bar, it has each kind
of form, its section shape one, does not have the circular pipe or the
diamond tube, recently has promoted the wing form, the warhead shape,
the T shape, the Delta shape, because each kind of shape examined the
measuring bar to correspond the different fluid theory, the cement
plant like determination used the fast pipe flow gauge, the author
suggested only provided the current capacity data and the pipeline
size, may the stream condition which determined by the manufacturer
basis determine examined the measuring bar the form and the
examination hole quantity and the position.
3. must select the high accuracy the elemental error pressure to
change delivering.
The differential pressure type fast pipe flow gauge is according
to the pitot pickup measured the fast principle, through measured the
total static pressure calculates the current capacity, commonly used
to heavy-caliber measured the gas flow amount, it has the difference
to press generally all quite young, is smallest possibly only has
20-30 handkerchief, must avoid for this using as far as possible
directs the pressure tube, selects the high accuracy the elemental
error pressure to change delivering, like 3,051 and so on, the best
plan is uses the fast tube, three valves group, the difference
pressure changes the delivering integration directly to install the
way, like this not only may reduce the use to direct divulging which
the pressure tube causes, Also may compensate the difference
which the temperature, the pressure change is changed to press
question and so on signal distortion. If selects the multi-
parameters to change the delivering integration fast pipe flow gauge
series ProBar and so on.
4. guarantees certain ascending pipes section length.
The differential pressure type fast pipe flow gauge front part
pipeline must guarantee has 7~9 to double a pipeline diameter
ascending pipe length (this data various materials not one, all has
from 3 times to 30 times), can cause in the big pipeline the gas
The speed of flow as far as possible symmetrically
distributes in the spool thread, only has this, only measured several
speeds of flow can calculate flows after the entire section current
capacity, otherwise in the big pipeline the gas speed of flow
distribution will be able very complex, the discharge coefficient K
undulation will be able to be very big, will not be able to guarantee
the survey the accuracy.
But the cement technological design is impossible to guarantee
the very long straight pipeline, this indeed is a contradiction.
The author believed, if determined selects some kind of form the
fast pipe flow gauge, may with supply goods business to discuss in
under the guarantee system duplicated premise, of reduces the straight
pipeline as far as possible, some reports stated, so long as measured
ratio of the tube diameter and the craft caliber is smaller than 1/10,
a front part pipeline ascending pipe length may fall to 3~4 doubles.
5. duplication and precision.
In the cement plant automated system, the differential pressure
type fast pipe flow gauge only is provides the information source in
some craft spot the examination link, its output reflected the gas
flow amount information, certainly does not request is some accurate
value, but should be correctly unmistakably reflects the current
capacity the change, if the determination grinding machine import and
export amount of wind certainly is not determines the amount of wind
the accurate value, mainly looked it in the technological process
change, maintains the amount of wind through the adjustment constant.
Here requests the fast tube work reliable, its output and the
current capacity existence monodrome function relations changes not at
will, namely the duplication was better may. Generally speaks
the straight length of pipe not to be able to achieve the request in
the situation, the duplication may achieve 0.5%, but the error
possibly surpasses 6%. In the automated system took the
adjustment and the monitoring, uses the structure simple differential
pressure type fast pipe flow gauge to have its superiority.
6. installs the essential dust filtrating equipment.
At present fast tube factory although declared surveys the
sensor anti- to stop up the question to be able to solve, but because
the cement craft peculiar circumstance, the author or the suggestion
installs the essential appurtenance, like the dust filtrating
equipment and so on, guarantees the measuring appliance normal work.
3. conclusions
1. increases, the technological process along with the
cement production scale unceasingly renews, the flow measurement and
the new flowmeter also start in the cement profession application,
moreover develops the tendency favors.
2. in cement factory automated system, if serves as the
adjustment and the monitoring, then big pipeline gas flow amount
survey, but first choice differential pressure type
Fast pipe flow gauge.
3. because in the cement craft the big pipeline gas contains the
dust, when selection with the differential pressure type fast tube
factory determined by all means must "the quantity body has
custom-made" and directly installs when each detail, some essential
appendices certainly must determine in the ordering. |
