CN206549320U - A kind of adjustable tube bank rotational flow dust-removing demister - Google Patents
A kind of adjustable tube bank rotational flow dust-removing demister Download PDFInfo
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- CN206549320U CN206549320U CN201621452709.6U CN201621452709U CN206549320U CN 206549320 U CN206549320 U CN 206549320U CN 201621452709 U CN201621452709 U CN 201621452709U CN 206549320 U CN206549320 U CN 206549320U
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Abstract
The utility model discloses the adjustable tube bank rotational flow dust-removing demister of one kind, belong to exhaust-gas treatment field.The device is located at the top of spraying layer in absorption tower, and described device includes the n rotational flow dust-removing demisting units being disposed vertically, n >=1.Adjustable tube bank rotational flow dust-removing demister described in the utility model overcomes prior art in load change the problem of inefficiency, have the advantages that meet emission request in the range of boiler full load, and flexible adjustment, it is easy to operate, simple and easy to apply, reliability is high.
Description
Technical field
The utility model belongs to exhaust-gas treatment field, and in particular to a kind of adjustable tube bank rotational flow dust-removing demister.
Background technology
At present, the existing coal unit of China generally uses lime stone --- gypsum wet flue gas desulfurizing technique, from absorption
In the wet flue gas of tower discharge in addition to the dust not eliminated containing part front end deduster, also containing substantial amounts of in fine mist shape
State lime stone, gypsum slurries etc., with the raising increasingly of state environmental emissioning standard, need to carry out depth to the neat stress after desulfurization
Dedusting.According to newest promulgation《Fossil-fuel power plant atmospheric pollutant emission standard》, the dust concentration to smoke stack emission proposes 5mg/
m3Requirement.
The dedusting demisting of flue gas is most commonly seen technique in fume purifying processes, and type is varied, but for containing
For the processing of the saturation wet flue gas of a large amount of droplets, the intractability with reality.In order to solve fine dust, particulate
Deng the small miscellaneous dirt separation of particle diameter, part of generating units is handled using deflection plate demister+WESP (wet type electrostatic precipitator), but for
Retrofit work amount is huge for built desulfurization unit, generally existing absorption tower body need to be increased, strengthening of foundation, transforms the cycle
It is long, and it contains substantial amounts of high voltage electric equipment, operation and operation difficulty are larger.
Bundled tube dedusting demister as WESP a kind of substitute technology, because its simple in construction, reliable, energy consumption is low
And be used widely.Bundled tube dedusting demister is a kind of gas-liquid separator based on centrifugal force separate, utilizes rotary pneumatic
The centrifugal action of stream, the drop carried secretly in air-flow is got rid of to wall peripheral, fine drop, fine solid particle particle in flue gas, gas
The reunion that collides with each other of the finely ground particles such as colloidal sol is condensed into big drop, and big drop is captured by cyclone cylinder surface liquid film again, so that real
Now separate and remove with gas phase, with pressure drop it is small, except fog effect preferably, it is simple in construction, transformation implement it is simple the advantages of, especially fit
For the waste gas demisting in acid mist after wet desulphurization with solid or with salinity.However, for such demister, void tower
Velocity in pipes influences notable to flow velocity on the separative efficiency of demister in other words, typically, within the specific limits, with velocity in pipes
Increase, the removal efficiency of demister improves, because air-flow is through making rotational flow behind spiral-plate leaf gap, with
The increase of empty tower gas velocity, the tangential velocity of air-flow becomes big, and the centrifugal force suffered by the drop carried secretly in air-flow also can accordingly increase
Greatly, so as to be conducive to drop to get rid of the purpose for reaching separation to wall；At the same time, with the increase in pipe, the turbulence journey of air-flow
Degree increase, drop reentrainment phenomenon is increasingly severe, and reentrainment is acted on mainly due to both sides：One is that drop is being touched
Atomization when hitting, two be high velocity air shearing force on the Free Surface of liquid film, when reentrainment amount exceed certain value after,
The separative efficiency of demister also declines therewith.
As can be seen here, there is contradiction in velocity in pipes and efficiency of dust collection, maintain higher efficiency of dust collection then to improve pipe
Interior flow velocity, and flow velocity is too high, and the ratio of reentrainment greatly improved, so as to cause the decline of efficiency of dust collection；On the other hand,
The load of boiler is often fluctuated, and is changed generally between 30~110%, is so also just caused the change width of velocity in pipes
Degree is huge.In order to balance above-mentioned contradiction, prior art is generally using the processing method of compromise, namely with a specific load point
(such as 100% load or 70% load) is designed as design point, when actual motion load is significantly higher than the design point
When, reentrainment effectively causes removal efficiency lowly, and when actual load is significantly less than the design point, centrifugal force is not enough and leads
Cause separating effect not high, the requirement of discharge index can not be met when serious.
Utility model content
The defect that the utility model exists for existing above-mentioned technology provides a kind of adjustable tube bank rotational flow dust-removing demisting
Device.
The purpose of this utility model can be achieved through the following technical solutions：
A kind of adjustable tube bank rotational flow dust-removing demister, the device is located at the top of spraying layer in absorption tower, including n
The rotational flow dust-removing demisting unit being disposed vertically, n >=1, the rotational flow dust-removing demisting unit includes cylindrical outer barrel, m eddy flow
Component, z can open and close type component, m >=1,0≤z≤1；
The eddy flow component includes several swirl vanes and a central tube, and swirl vane is uniform at an oblique angle
It is centrally located in the annular section between drum outer wall and cylindrical outer barrel inwall；
It is described can open and close type component include the first power transmission shaft and can be overturn with the first power transmission shaft upper and lower displacement
Blade may be reversed in several, and Leaf positional distribution may be reversed in the annular section between power transmission shaft and cylindrical outer barrel inwall, adjacent
The orthographic projection that blade may be reversed coincides or partly overlapped.
In some technical schemes：Described turnable blade is connected by wheel hub with the first power transmission shaft, and blade may be reversed
Tail end is connected provided with lower hinge seat, the first power transmission shaft provided with upper hinge seat, one end of connecting rod with upper hinge seat, the other end and
Lower hinge seat connection, the inwall of the cylindrical outer barrel is provided with limited block, and described limited block is located at the lower section of blade；
When the first described power transmission shaft is moved upwards, blade may be reversed and is lifted upwards by the traction of connecting rod, realizes and may be reversed
The unlatching of blade；The first described power transmission shaft is moved downward, and turnable blade is pushed by connecting rod is moved downwardly to limited block, real
The closure of blade now may be reversed.
In some technical schemes：The device is provided with some second driving shafts, described second driving shaft and rotational flow dust-removing
The first power transmission shaft in demisting unit is connected, and second driving shaft can control the up and down motion of the first power transmission shaft.
In some technical schemes：Between rotational flow dust-removing demisting unit and rotational flow dust-removing demisting unit with absorb inner wall of tower it
Between the upper and lower end face of rotational flow dust-removing demisting unit is provided with sealing plate.
In some technical schemes：It is described can open and close type component be located at rotational flow dust-removing demisting unit inward eddy component before,
Afterwards or between two eddy flow components.
In some technical schemes：Described eddy flow component is connected by way of welding with the inwall of cylindrical outer barrel.
In some technical schemes：Described central tube is the cylinder that end face is provided with blind plate.
In technical solutions of the utility model：The number n of the rotational flow dust-removing demisting unit is most according to boiler peak load
Greatly may the selection of void tower flow velocity.
In technical solutions of the utility model：It is described can open and close type component number z it is negative no less than boiler minimum load/maximum
The sum (n) of lotus × rotational flow dust-removing demisting unit.Will be set in i.e. each rotational flow dust-removing demisting unit can open and close type component,
Can part not set, can also set entirely, but the total amount set be no less than (it is expected that boiler peak load-estimated minimal negative
Lotus)/estimated boiler peak load × rotational flow dust-removing demisting unit sum (n), that is to say, that if in estimated minimal negative
In the case of lotus, can by it is all can open and close type component close, reach in the same pipe of estimated boiler busy hour
Flow velocity.
The beneficial effects of the utility model：
Adjustable tube bank rotational flow dust-removing demister described in the utility model overcomes prior art in load change
The problem of inefficiency, have the advantages that meet emission request in the range of boiler full load, and flexible adjustment, operation side
Just, simple and easy to apply, reliability is high.
Brief description of the drawings
Fig. 1 is the adjustable top view for restraining rotational flow dust-removing demister；
Fig. 2 is the adjustable front view for restraining rotational flow dust-removing demister；
Fig. 3 is the front view of bundled tube demister；
Fig. 4 is the top view of bundled tube demister；
Fig. 5 is the installation drawing of high-effective dust-removing deentrainment tower；
Fig. 6 (a) and Fig. 6 (b) for can open and close type component opening；
Fig. 7 (a) and Fig. 7 (b) for can open and close type component closure state.
1- is that blade may be reversed, and 2 be connecting rod, and 3 be the first power transmission shaft, and 4 be swirl vane, and 5 be limited block, and 6 be lower hinge
Seat, 7 be upper hinge seat, and 8 be cylindrical outer barrel, and 9 be cylinder centered on second driving shaft, 10, and 11 be sealing plate, and 12 be spraying layer,
13 be rotational flow dust-removing demisting unit for adjustable tube bank rotational flow dust-removing demister, 14.
Embodiment
The utility model is described further with reference to embodiment, but protection domain of the present utility model is not limited to
This：
Such as Fig. 1~5 and Fig. 6 (a), 6 (b), 7 (a) and 7 (b), a kind of adjustable tube bank rotational flow dust-removing demister should
Device is located at the top of spraying layer (12) in absorption tower, including the rotational flow dust-removing demisting units (14) that n is disposed vertically, n >=1,
The rotational flow dust-removing demisting unit (14) includes cylindrical outer barrel (8), m eddy flow component, z can open and close type component, m >=1,
0≤z≤1；
The eddy flow component includes several swirl vanes (4) and a central tube (10), and swirl vane (4) is with inclination
Even angle be centrally located in the annular section between cylinder (10) outer wall and cylindrical outer barrel (8) inwall；
It is described can open and close type component include the first power transmission shaft (3) and can be carried out with the first power transmission shaft (3) upper and lower displacement
Blade (1) may be reversed in several of upset, and blade (1) may be reversed and is distributed between power transmission shaft (3) and cylindrical outer barrel (8) inwall
Annular section in, the orthographic projection of adjacent turnable blade (1) coincides or partly overlapped.
Described turnable blade (1) is connected by wheel hub with the first power transmission shaft (3), be may be reversed and is set on blade (1) tail end
There is lower hinge seat (6), the first power transmission shaft (3) is connected provided with upper hinge seat (7), one end of connecting rod (2) with upper hinge seat (7),
The other end is connected with lower hinge seat (6), and the inwall of the cylindrical outer barrel (8) is provided with limited block (5), described limited block
(5) it is located at the lower section that blade (1) may be reversed；
When described the first power transmission shaft (3) is moved upwards, blade (1) may be reversed and is lifted upwards by the traction of connecting rod (2), it is real
The unlatching of blade (1) now may be reversed；Described the first power transmission shaft (3) is moved downward, and blade (1) may be reversed by under connecting rod (2)
Pressure is moved downwardly to limited block (5), realizes the closure that blade (1) may be reversed.
The device is provided with some second driving shafts (9), described second driving shaft (9) and rotational flow dust-removing demisting unit (14)
Interior the first power transmission shaft (3) is connected, and second driving shaft (9) can control the up and down motion of the first power transmission shaft (3).
Revolved between rotational flow dust-removing demisting unit (14) and between rotational flow dust-removing demisting unit (14) and absorption inner wall of tower
The upper and lower end face of stream dedusting demisting unit (14) is provided with sealing plate (11).
It is described can open and close type component be located at rotational flow dust-removing demisting unit (14) inward eddy component before, afterwards or two eddy flows
Between component.
Inwall of the described eddy flow component (4) with cylindrical outer barrel (8) by way of welding is connected.
Described central tube (10) is the cylinder that end face is provided with blind plate.
Below by taking certain 135MW unit as an example, design air flow is 1000000m during 100% load3/ h, prior art is generally pressed
Peak load takes optimal flow rate (being usually 6~7m/s), for ease of description, takes velocity in pipes 6m/s, rotational flow dust-removing need to be arranged altogether
Demisting unit 368, i.e. n=368, when load is higher, demisting efficiency of dust collection is higher；When load reduction to 85% or so
When, air quantity now is also reduced to 850000m3/ h, velocity in pipes is down to 5.1m/s, and the centrifugal force that swirl vane is produced declines,
Demisting efficiency of dust collection is reduced；When load is further reduced to 60% or so, air quantity now is also reduced to 600000m3/ h, pipe
Interior flow velocity is down to 3.6m/s, and the centrifugal force that swirl vane is produced further declines, and demisting dust removing effects drastically deteriorate；This just occurs
Part of generating units operational excellence when at full capacity, and to effect extreme difference when underload, or even occur in that large area
Gypsum rain phenomenon.
Also there have part of generating units to be above-mentioned to avoid the occurrence of, and optimal flow rate is taken with less load, such as by 80%
Velocity in pipes is 6m/s when load, and in this case when load rises to 100%, velocity in pipes is 7.5m/s, and demisting is removed
Dirt efficiency is higher, but reentrainment is also very serious, causes overall efficiency relatively low；When load is down to 60%, velocity in pipes is
4.5m/s, the centrifugal force that swirl vane is produced declines, the reduction of demisting efficiency of dust collection；In this case only near designed load point
Efficiency preferably, deviates after load because reentrainment or centrifugal force decline can all cause the reduction of dedusting demisting efficiency.
The utility model still takes optimal flow rate by peak load, for ease of contrast, takes velocity in pipes 6m/s, rotation need to be arranged altogether
Flow dedusting demisting unit 368, i.e. n=368, while there is provided z open and close type component, it is assumed that the minimum of the target unit may
Load is 50%, then z=0.5 × n=184, that is to say, that have and open and close type is provided with 50% rotational flow dust-removing demisting unit
Component.
When load is 100%, design air flow is 1000000m3/ h, open and close type component standard-sized sheet, velocity in pipes is 6m/s；
When load reduction is to 85% or so, air quantity now is also reduced to 850000m3/ h, can now close (100%-85%) × n
=55 (55.2, it is 55) individual open and close type component after rounding, such flue gas is only from the remaining 313 rotational flow dust-removing demistings being not turned off
Pass through in unit, velocity in pipes is 6.0038m/s, and velocity in pipes is basically identical during 100% load, demisting efficiency of dust collection is kept
It is stable；When load is further reduced to 60% or so, air quantity now is also reduced to 600000m3/ h, can now be closed
(100%-60%) × n=147 (147.2, be 147) individual open and close type component after rounding, such flue gas only from remaining 221 not
Pass through in the rotational flow dust-removing demisting unit of closing, velocity in pipes is 6.0054m/s, and velocity in pipes basic one during 100% load
Cause, demisting efficiency of dust collection keeps stable.It is so real by adjusting the folding quantity of open and close type component under different loading condictions
The stabilization of existing velocity in pipes, so as to ensure the centrifugal force of swirl vane, reaches the effect that efficiency keeps stable.Certainly, it is above-mentioned to be
Optimal implementation, i.e., each rotational flow dust-removing demisting unit provided with open and close type component is individually controlled, and this just needs each
Unit is provided with single actuator, and cost is higher.For reduce cost also can zonal control, such as 184 in above-described embodiment
Open and close type component is divided into 8 area's controls, and each area connects 23 open and close type components, i.e., distinguished by 8 second driving shafts respectively
It is connected with 23 the first power transmission shafts, sets actuator to control folding on every second axle.When load is 100%, 8 areas are complete
Open, velocity in pipes is 6m/s；When load reduction is to 85% or so, it is 46 open and close type components to close wherein 2 areas, is flowed in pipe
Speed is 6.17m/s；When load is further reduced to 60% or so, it is 138 open and close type components to close wherein 6 areas, in pipe
Flow velocity is 6.25m/s；Flow velocity and optimum flow rate deviation are smaller, can preferably meet and be actually needed.Certainly, if the target unit
Minimum may load be 30% or other numerical value, also can be designed and be adjusted by equal way.
For the influence for the component stream field for farthest reducing closing passage, the method that can be closed using interruption packet,
I.e. every one or two, the passage closed is chosen every a row or two rows, is reached as far as possible uniformly, these are all this technology necks
Technology known to the personnel in domain.
Claims (7)
1. a kind of adjustable tube bank rotational flow dust-removing demister, it is characterised in that：The device is located at spraying layer in absorption tower（12）
Top, including rotational flow dust-removing demisting units that n is disposed vertically（14）, n >=1, the rotational flow dust-removing demisting unit（14）Bag
Contain cylindrical outer barrel（8）, m eddy flow component, z can open and close type component, m >=1,0≤z≤1；
The eddy flow component includes several swirl vanes（4）With a central tube（10）, swirl vane（4）With inclined angle
Degree is evenly distributed on central tube（10）Outer wall and cylindrical outer barrel（8）In annular section between inwall；
It is described can open and close type component include the first power transmission shaft（3）And can be with the first power transmission shaft（3）Upper and lower displacement is overturn
Several may be reversed blades（1）, blade may be reversed（1）It is distributed in power transmission shaft（3）With cylindrical outer barrel（8）Ring between inwall
In shape region, adjacent turnable blade（1）Orthographic projection coincide or partly overlap.
2. adjustable tube bank rotational flow dust-removing demister according to claim 1, it is characterised in that：Described turnable leaf
Piece（1）Pass through wheel hub and the first power transmission shaft（3）It is connected, blade may be reversed（1）Tail end is provided with lower hinge seat（6）, the first transmission
Axle（3）Provided with upper hinge seat（7）, connecting rod（2）One end and upper hinge seat（7）Connection, the other end and lower hinge seat（6）Even
Connect, the cylindrical outer barrel（8）Inwall be provided with limited block（5）, described limited block（5）Positioned at turnable blade（1）'s
Lower section；
The first described power transmission shaft（3）Upwards during motion, blade may be reversed（1）By connecting rod（2）Traction lift upwards, realization can
Overturn blade（1）Unlatching；The first described power transmission shaft（3）Move downward, blade（1）By connecting rod（2）Push and move downward
To limited block（5）, realize blade（1）Closure.
3. adjustable tube bank rotational flow dust-removing demister according to claim 1, it is characterised in that：The device is provided with some
Second driving shaft（9）, described second driving shaft（9）With rotational flow dust-removing demisting unit（14）The first interior power transmission shaft（3）It is connected,
Second driving shaft（9）Controllable first power transmission shaft（3）Up and down motion.
4. adjustable tube bank rotational flow dust-removing demister according to claim 1, it is characterised in that：Rotational flow dust-removing demisting list
Member（14）Between and rotational flow dust-removing demisting unit（14）In rotational flow dust-removing demisting unit between absorption inner wall of tower（14）It is upper
Lower surface is provided with sealing plate（11）.
5. adjustable tube bank rotational flow dust-removing demister according to claim 1, it is characterised in that：It is described can open and close type group
Part is located at rotational flow dust-removing demisting unit（14）Before inward eddy component, afterwards or between two eddy flow components.
6. adjustable tube bank rotational flow dust-removing demister according to claim 1, it is characterised in that：Described swirl vane
（4）By way of welding and cylindrical outer barrel（8）Inwall be connected.
7. adjustable tube bank rotational flow dust-removing demister according to claim 1, it is characterised in that：Described central tube
（10）The cylinder of blind plate is provided with for end face.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201621452709.6U CN206549320U (en) | 2016-12-28 | 2016-12-28 | A kind of adjustable tube bank rotational flow dust-removing demister |
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| CN201621452709.6U CN206549320U (en) | 2016-12-28 | 2016-12-28 | A kind of adjustable tube bank rotational flow dust-removing demister |
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| CN206549320U true CN206549320U (en) | 2017-10-13 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106731254A (en) * | 2016-12-28 | 2017-05-31 | 南京宇行环保科技有限公司 | A kind of adjustable tube bank rotational flow dust-removing demister |
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- 2016-12-28 CN CN201621452709.6U patent/CN206549320U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106731254A (en) * | 2016-12-28 | 2017-05-31 | 南京宇行环保科技有限公司 | A kind of adjustable tube bank rotational flow dust-removing demister |
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