CN207080981U - A kind of low-level (stack-gas) economizer of accumulatingdust - Google Patents
A kind of low-level (stack-gas) economizer of accumulatingdust Download PDFInfo
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- CN207080981U CN207080981U CN201720543340.8U CN201720543340U CN207080981U CN 207080981 U CN207080981 U CN 207080981U CN 201720543340 U CN201720543340 U CN 201720543340U CN 207080981 U CN207080981 U CN 207080981U
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Abstract
The utility model discloses a kind of low-level (stack-gas) economizer of accumulatingdust, there is set of heat exchange tubes in the low-level (stack-gas) economizer, the low-level (stack-gas) economizer is arranged on the upstream of thermal power plant smoke processing system electric cleaner；The low-level (stack-gas) economizer includes economizer cabin, the bottom in economizer cabin is provided with some ash discarding devices, the ash discarding device includes blade of louver window and rotary shaft, blade of louver window is installed on the rotary shaft, rotary shaft is connected with motor, and the width of blade of louver window is more than or equal to adjacent two with the distance between rotary shaft；The lower section of some ash discarding devices is provided with ash bucket, and the lower section of ash bucket is provided with ash mouth.Utility model adds the ash bucket mode of rotary discharge valve using the bottom flue of shutter pattern, flue gas had both been kept original heat exchange flow field and space, and and can smoothly excludes bottom dust stratification in the case where not influenceing flue vacuum.
Description
Technical field
Low-level (stack-gas) economizer is the utility model is related to, more particularly to a kind of low-level (stack-gas) economizer of accumulatingdust.
Background technology
In order to reach the purpose of coal-burning power plant's energy-saving and emission-reduction, low-level (stack-gas) economizer, flue gas and condensate are installed before electric cleaner additional
The countercurrent flow in low-level (stack-gas) economizer, heat medium water are heated up, and flue-gas temperature is reduced to acid dew-point temperature.Low-level (stack-gas) economizer is not
Only heat-setting water can be used for Mist heat recovering or heat the First air of air preheater, simultaneously as flue-gas temperature drops
Low, the flue gas volume flow into electric cleaner is reduced, and dust concentration increase, ratio resistance reduces, and lifts the dedusting of electric cleaner
Efficiency and reduction electric cleaner equipment investment, low-level (stack-gas) economizer are the crucial equipment of coal-burning power plant's energy-saving and emission-reduction transformation.Due to mesh
Preceding electric power production capacity surplus, many power plant are in underrun state, and the reduction of exhaust gas volumn causes cigarette speed smaller, so as to cause cigarette
Road and a large amount of dust stratifications of low-level (stack-gas) economizer, finally have a strong impact on low-level (stack-gas) economizer heat exchange property.
Utility model content
The purpose of this utility model is, there is provided a kind of low-level (stack-gas) economizer of accumulatingdust, using the bottom of shutter pattern
Flue adds the ash bucket mode of rotary discharge valve, makes flue gas both keep original heat exchange flow field and space, and can influenceing cigarette
Bottom dust stratification is smoothly excluded in the case of road vacuum.
The design of flue gas flow velocity is about 5m/s or so at full capacity for general power plant, is had in the flue gas before electric cleaner a large amount of
Flue dust, abrasion is also easy to produce to upstream equipment, is arranged in the low-level (stack-gas) economizer before electric cleaner and exchanges heat, between its design pipe of BMCR operating modes
Flow velocity is typically being controlled in 9~10m/s, and when cigarette speed is more than 10m/s, rate of wear exponentially rises, flue gas flow rate >=6m/s,
Flue dust can largely be taken away with flue gas, be removed through electric precipitation.Because most of current many heating agent power plant are underrun
(75% or 50%), flue gas flow velocity are then less than 5m/s, into low-level (stack-gas) economizer entrance concentric reducer after flue gas flow rate then become
It is lower, so cause current low-level (stack-gas) economizer gas approach and low-level (stack-gas) economizer bottom a large amount of fouling phenomenons to be present, at present low temperature
Though economizer system is furnished with soot blower system, the dust stratification that the soot blower system can only make to be attached on heat exchanger tube and fin becomes fluffy
Pine, if can be carried along under the high operating mode of flue gas flow rate by flue gas in electric cleaner, the low operating mode of flue gas flow rate, flue dust is still not
Can be pulled away, it is fluffy after flue dust fall into low-level (stack-gas) economizer bottom, long time integration can buried portion heat exchanger tube, cause heat exchanger
Heat exchange area is reduced, and design requirement can not be met by ultimately resulting in heat exchanger.
In order to solve the above technical problems, the utility model adopts the following technical scheme that：
A kind of low-level (stack-gas) economizer of accumulatingdust, the low-level (stack-gas) economizer is interior to have set of heat exchange tubes, the low-level (stack-gas) economizer peace
Mounted in the upstream of thermal power plant smoke processing system electric cleaner；The low-level (stack-gas) economizer includes economizer cabin, economizer
The bottom in cabin is provided with some ash discarding devices, and the ash discarding device includes blade of louver window and rotary shaft, blade of louver window peace
On the rotary shaft, rotary shaft is connected with motor to dress, and the width of blade of louver window is more than or equal to adjacent two with rotation
The distance between axle；The lower section of some ash discarding devices is provided with ash bucket, and the lower section of ash bucket is provided with ash mouth.Ash bucket and ash mouth
Between be provided with valve body.The valve body can select the similar SLD such as rotary discharge valve or plate (blind plate)
Ash bucket is additionally arranged at the bottom in shutter, when shutter is in open mode, dust stratification can fall into ash bucket, due to this section of cigarette
Road is negative pressure state, if hopper bottom is open type, when shutter closes, due to poorly sealed, can produce and divulge a secret；Shutter is beaten
Begin to rehearse ash when outside air can largely be inhaled into flue, destroy flue vacuum, influence the stability of whole system, unloaded to ensure
Grey process flue internal pressure, which is tried hard to keep, holds constant, the similar SLD of outlet installation rotary discharge valve or plate (blind plate) etc. under ash bucket,
It can so prevent from leaking out and destroying flue vacuum.
As one of which embodiment, preferably, in a kind of low-level (stack-gas) economizer of foregoing accumulatingdust, the blinds
The distance of window blade A ends and rotary shaft is more than the distance of its B end and rotary shaft.When rotated, A ends are downward for blade of louver window, B ends
Upwards, complete it is basic while turning over ash effect, additionally it is possible to reduce resistance of the blade of louver window to flue gas as far as possible, reduce and pair set
The influence of received shipment row.Specifically, one end of the blade of louver window has seal groove, the other end has sealing block.Work as shutter
Under horizontality, on the one hand adjacent two blade of louver window make economizer cabin by the form of seal groove and sealing block
Room can thoroughly be sealed, and on the other hand make the bottom in economizer cabin smooth, reduce the resistance of flue gas circulation.
In a kind of low-level (stack-gas) economizer of foregoing accumulatingdust, the blade of louver window, which is provided with, to be used to gather dust pressure
Pressure sensor, pressure sensor are connected with the motor.When deposition dust reaches certain thickness or quality, pressure sensing
Device can control rotary shaft to rotate, automatic ash-removing.
As one of which embodiment, in a kind of low-level (stack-gas) economizer of foregoing accumulatingdust, the low-level (stack-gas) economizer
Including import concentric reducer, economizer cabin and the outlet concentric reducer being sequentially communicated, import expansion joint is installed on import concentric reducer,
Outlet expansion joint is installed on outlet concentric reducer.
In a kind of low-level (stack-gas) economizer of foregoing accumulatingdust, the making material of blade of louver window is resistant material, specifically
, the resistant material is resin, alloy, fiberglass or polytetrafluoroethylene (PTFE).
A kind of control method of the low-level (stack-gas) economizer of above-described accumulatingdust, including following methods：Low-level (stack-gas) economizer is transported
Dust deposit is had during row on blade of louver window, collection by the pressure of deposition dust, works as pressure to pressure sensor in real time
When the pressure value that force snesor collects is more than predetermined value, the control motor driving rotation of pressure sensor output control signal
Axle rotates, and the deposition dust on blade of louver window is slid into ash bucket；Deposition dust slides moves motor driving rotation into ash bucket rear-guard
Rotating shaft rotates, and two adjacent blade of louver window is mutually contradicted, by economizer cabin sealed bottom.
In order to reduce resistance of the blade of louver window to flue gas, a kind of control of the low-level (stack-gas) economizer of foregoing accumulatingdust as far as possible
In method, when the pressure value that pressure sensor collects is more than predetermined value, the control driving of pressure sensor output control signal
Motor driving rotary shaft rotation, moves down blade of louver window A ends, blade of louver window B ends move up.
Compared with prior art, the utility model blade of louver window uses the pattern with otch so that upper table after closure
Face is even surface, will not cause former flue that alteration of form occurs, and improved flue maintains the flow fields environment of original flue.When
During performing low-load running of machine set, flue gas flow rate is too low, and the dust in flue gas can not enter electric precipitation with flue gas, and largely fall to low
Warm economizer bottom, longtime running, dust stratification will bury part heat exchanger tube, influence the exchange capability of heat of low-level (stack-gas) economizer, and use
Scheme of the present utility model can remove low-level (stack-gas) economizer bottom dust stratification in the case where not influenceing production, recover its heat exchange effect
Fruit, ensure that design is economized on coal index.Simultaneously because dust stratification can remove in time, acid ingredient exchange heat pipe in dust stratification can be reduced and changed
The corrosion of hot device housing and the pressure drop of low-level (stack-gas) economizer, in the extension device life-span, reduce operation cost.
Brief description of the drawings
Fig. 1 is a kind of structural representation of embodiment of the present utility model.
Reference：1- import expansion joints, 2- import concentric reducers, 3- economizers cabin, 4- outlets concentric reducer, 5- outlets are swollen
Swollen section, 6-B ends, 7- rotary shafts, 8- blade of louver window, 9-A ends, 10- ash buckets, 11- valve bodies, 12- ash mouths.
The utility model is further described with reference to the accompanying drawings and detailed description.
Embodiment
Embodiment 1 of the present utility model：As shown in figure 1, a kind of low-level (stack-gas) economizer of accumulatingdust, in the low-level (stack-gas) economizer
With set of heat exchange tubes, the low-level (stack-gas) economizer is arranged on the upstream of thermal power plant smoke processing system electric cleaner；It is described low
Warm economizer includes economizer cabin 3, and the bottom in economizer cabin 3 is provided with some ash discarding devices, and the ash discarding device includes
Blade of louver window 8 and rotary shaft 7, blade of louver window 8 are arranged in rotary shaft 7, and rotary shaft 7 is connected with motor, shutter
The width of blade 8 is more than or equal to adjacent two with the distance between rotary shaft 7；The lower section of some ash discarding devices is provided with
Ash bucket 10, the lower section of ash bucket 10 are provided with ash mouth 12.
The blade of louver window 8A ends 9 and the distance of rotary shaft 7 are more than its B end 6 and the distance of rotary shaft 7.The blinds
One end of window blade 8 has seal groove, and the other end has sealing block.The blade of louver window 8, which is provided with, to be used to gather dust pressure
The pressure sensor of power, pressure sensor are connected with the motor.
Embodiment 2：As shown in figure 1, a kind of low-level (stack-gas) economizer of accumulatingdust, the low-level (stack-gas) economizer is interior to have heat exchanger tube
Group, the low-level (stack-gas) economizer are arranged on the upstream of thermal power plant smoke processing system electric cleaner；The low-level (stack-gas) economizer bag
Economizer cabin 3 is included, the bottom in economizer cabin 3 is provided with some ash discarding devices, and the ash discarding device includes blade of louver window 8
With rotary shaft 7, blade of louver window 8 is arranged in rotary shaft 7, and rotary shaft 7 is connected with motor, the width of blade of louver window 8
More than or equal to adjacent two with the distance between rotary shaft 7；The lower section of some ash discarding devices is provided with ash bucket 10, ash bucket
10 lower section is provided with ash mouth 12.The blade of louver window 8A ends 9 and the distance of rotary shaft 7 are more than its B end 6 and rotary shaft 7
Distance.One end of the blade of louver window 8 has seal groove, and the other end has sealing block.
The blade of louver window 8 is provided with the pressure sensor for being used for gathering dust pressure, pressure sensor and the drive
Dynamic motor is connected.The low-level (stack-gas) economizer includes import concentric reducer 2, economizer cabin 3 and the outlet concentric reducer 4 being sequentially communicated,
Import expansion joint 1 is installed on import concentric reducer 2, exports and outlet expansion joint 5 is installed on concentric reducer 4.The system of blade of louver window 8
It is polytetrafluoroethylene (PTFE) as material.Rotary discharge valve is provided between ash bucket 10 and ash mouth 12.
Low-level (stack-gas) economizer is the key equipment of the flue gas waste heat recovery of coal-burning power plant, because current many heating agent power plant are most
Number is underrun (75% or 50%), and flue gas flow velocity is less than 5m/s, can expanded into low-level (stack-gas) economizer entrance
Footpath, such flue gas flow rate then become lower, so cause low-level (stack-gas) economizer gas approach and low-level (stack-gas) economizer bottom to exist largely
Fouling phenomenon, the reduction of low-level (stack-gas) economizer heat exchange efficiency is caused, influence to design effect of coal saving, while increase low-level (stack-gas) economizer equipment pressure
Drop, increase blower fan power consumption.The utility model is that low-level (stack-gas) economizer bottom flue is changed into shutter form, meanwhile, in shutter
It is additionally arranged at the bottom ash bucket 10 and valve body 11.When there is dust stratification low-level (stack-gas) economizer bottom and accumulates to a certain extent, shutter is furnished with pressure
Sensor, wait dust stratification highly up to a certain degree when, transmit a signal to motor, motor driving rotary shaft 7, which rotates, to be opened
Blade of louver window 8 is opened, blade of louver window 8 is rotated by 90 ° from horizontal closed state is changed into vertical state, and dust stratification above can be fallen into
Bottom ash bucket 10, if part dust stratification is stained with blade of louver window 8 to be fallen, blade of louver window 8 can be waved repeatedly to produce shake
Dynamic or installation soot blower completely falls off dust stratification, and this operating time is short, and low-level (stack-gas) economizer system flow field will not be had an impact.
Dust stratification closes shutter after falling into ash bucket 10, it is recovered closure state, treats that dust stratification reaches to a certain degree in ash bucket 10, passes through
Level-sensing device sensing is to control room in ash bucket 10, automatically turns on rotary discharge valve, and the dust stratification in ash bucket 10 is with rotary valve
Rotation is carried over ash bucket, falls into outside ash equipment, treats that dust stratification is completely exhausted out in ash bucket 10, and rotary unloading is closed by automatic feedback
Expect valve.
Claims (8)
1. a kind of low-level (stack-gas) economizer of accumulatingdust, the low-level (stack-gas) economizer is interior to have set of heat exchange tubes, it is characterised in that the low temperature
Economizer is arranged on the upstream of thermal power plant smoke processing system electric cleaner；
The low-level (stack-gas) economizer includes economizer cabin (3), and the bottom of economizer cabin (3) is provided with some ash discarding devices, institute
Stating ash discarding device includes blade of louver window (8) and rotary shaft (7), and blade of louver window (8) is arranged in rotary shaft (7), rotary shaft
(7) be connected with motor, the width of blade of louver window (8) be more than or equal to adjacent two between rotary shaft (7) away from
From；
The lower section of some ash discarding devices is provided with ash bucket (10), and the lower section of ash bucket (10) is provided with ash mouth (12).
A kind of 2. low-level (stack-gas) economizer of accumulatingdust according to claim 1, it is characterised in that blade of louver window (8) A
(9) and the distance of rotary shaft (7) is held to be more than its B end (6) and the distance of rotary shaft (7).
A kind of 3. low-level (stack-gas) economizer of accumulatingdust according to claim 2, it is characterised in that the blade of louver window (8)
One end there is seal groove, the other end has sealing block.
A kind of 4. low-level (stack-gas) economizer of accumulatingdust according to claim 3, it is characterised in that the blade of louver window (8)
The pressure sensor for being used for gathering dust pressure is provided with, pressure sensor is connected with the motor.
5. the low-level (stack-gas) economizer of a kind of accumulatingdust according to claim 4, it is characterised in that the low-level (stack-gas) economizer includes
The import concentric reducer (2) that is sequentially communicated, economizer cabin (3) and outlet concentric reducer (4), be provided with import concentric reducer (2) into
Mouth expansion joint (1), export and outlet expansion joint (5) is installed on concentric reducer (4).
A kind of 6. low-level (stack-gas) economizer of accumulatingdust according to claim 5, it is characterised in that the system of blade of louver window (8)
It is resistant material as material.
7. the low-level (stack-gas) economizer of a kind of accumulatingdust according to claim 6, it is characterised in that the resistant material is tree
Fat, alloy, fiberglass or polytetrafluoroethylene (PTFE).
8. the low-level (stack-gas) economizer of a kind of accumulatingdust according to claim 7, it is characterised in that ash bucket (10) and ash mouth
(12) valve body (11) is provided between.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720543340.8U CN207080981U (en) | 2017-05-16 | 2017-05-16 | A kind of low-level (stack-gas) economizer of accumulatingdust |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201720543340.8U CN207080981U (en) | 2017-05-16 | 2017-05-16 | A kind of low-level (stack-gas) economizer of accumulatingdust |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106958809A (en) * | 2017-05-16 | 2017-07-18 | 中国华电科工集团有限公司 | The low-level (stack-gas) economizer and its control method of a kind of accumulatingdust |
| CN108613163A (en) * | 2018-06-14 | 2018-10-02 | 华能国际电力股份有限公司 | A kind of low low-level (stack-gas) economizer system and its working method for preventing from blocking up ash |
| CN110195858A (en) * | 2019-05-29 | 2019-09-03 | 华侨大学 | Recirculating fluidized bed absorption tower flue |
-
2017
- 2017-05-16 CN CN201720543340.8U patent/CN207080981U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106958809A (en) * | 2017-05-16 | 2017-07-18 | 中国华电科工集团有限公司 | The low-level (stack-gas) economizer and its control method of a kind of accumulatingdust |
| CN106958809B (en) * | 2017-05-16 | 2023-05-05 | 中国华电科工集团有限公司 | Low-temperature economizer capable of preventing dust deposit and control method thereof |
| CN108613163A (en) * | 2018-06-14 | 2018-10-02 | 华能国际电力股份有限公司 | A kind of low low-level (stack-gas) economizer system and its working method for preventing from blocking up ash |
| CN108613163B (en) * | 2018-06-14 | 2023-05-30 | 华能国际电力股份有限公司 | Low-low-temperature economizer system capable of preventing ash blocking and working method thereof |
| CN110195858A (en) * | 2019-05-29 | 2019-09-03 | 华侨大学 | Recirculating fluidized bed absorption tower flue |
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