CN107990310A - A kind of low temperature revert system of fluidized-bed combustion boiler - Google Patents
A kind of low temperature revert system of fluidized-bed combustion boiler Download PDFInfo
- Publication number
- CN107990310A CN107990310A CN201711472404.0A CN201711472404A CN107990310A CN 107990310 A CN107990310 A CN 107990310A CN 201711472404 A CN201711472404 A CN 201711472404A CN 107990310 A CN107990310 A CN 107990310A
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- CN
- China
- Prior art keywords
- fluidized
- flue gas
- low temperature
- bed combustion
- returning device
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C10/00—Fluidised bed combustion apparatus
- F23C10/18—Details; Accessories
- F23C10/24—Devices for removal of material from the bed
- F23C10/26—Devices for removal of material from the bed combined with devices for partial reintroduction of material into the bed, e.g. after separation of agglomerated parts
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Abstract
The present invention discloses a kind of low temperature revert system of fluidized-bed combustion boiler, is related to technical field of thermoelectricity.The low temperature revert system of fluidized-bed combustion boiler includes separator, the material returning device connected with the separator bottom, and the desulfurizer with being connected at the top of the separator, and the exhanst gas outlet side of the desulfurizer is equipped with the first flue gas branch connected with the material returning device.The present invention is by regarding the flue gas after boiler desulfurization as returning charge wind and fluidized wind wind regime, substitute the existing mode for using air as material returning device returning charge wind and fluidized wind wind regime, the characteristics of making full use of flue gas hypoxemia low temperature after desulfurization, material returning device enable on the premise of smooth returning charge is ensured, suppress material burning, temperature of charge and the main bed tempertaure of boiler in material returning device are reduced, so as to fulfill boiler NOXInitial ejection amount is greatly lowered and fundamentally prevents coking of material returner.
Description
Technical field
The present invention relates to the low temperature revert system of technical field of thermoelectricity, more particularly to a kind of fluidized-bed combustion boiler.
Background technology
Substantial amounts of material needs to reenter by outer circulation (separating revert system) in fluidized-bed combustion boiler combustion system
Hearth combustion.In general, Small and Medium Circulating Fluidized Bed Boiler does not configure external bed heat generally, such boiler use volatile matter compared with
When fire retardant cinder coal, coal particle burns away low anthracite in separation revert system, causes temperature of charge in material returning device
It is very high, or even cause material returning device overtemperature coking to cause boiler shutdown.
At present, the fluidized-bed combustion boiler on no external bed heat realizes that the method for low temperature returning charge is less, mainly passes through
Increase cooling heat transferring pipe inside the vertical feed back pipe and material returning device of cyclone separator, the working medium in metallic heat exchanging tube, which is flowed through in pipe, inhales
Receive the heat of uncombusted material release in the vertical feed back pipe or material returning device of cyclone separator, the working medium of heating be used for boiler to
Water or other with water, and the uncombusted thermal material that separator separates is released exothermic heat and is absorbed, reduce temperature it
Material afterwards returns to burner hearth by material returning device and burns away.The core of such a method for realizing fluidized-bed combustion boiler low temperature returning charge is logical
Supercooling heat exchange mode reduces temperature of charge, but is washed away acutely in this region arrangement heat-transfer surface material, and heat-transfer surface is easy to wear, because
This heat-transfer surface service life is short must often to change pipe maintenance, have impact on boiler safety stable operation to a certain extent.This area at the same time
Domain space is narrow and small, arranges that excessive heat-transfer surface can influence Flow of Goods and Materials, especially material returning device returning charge side, it is difficult to ensure the suitable of returning charge
Smooth property.
Therefore, how ensure that returning charge is smooth and long-time steady operation on the premise of, realize the reduction of material air-teturning temperature, be
The circulating fluidized bed boiler of fire retardant coal to the greatest extent one of technical barrier urgently to be resolved hurrily is used at present.
The content of the invention
It is an object of the invention to provide a kind of low temperature revert system of fluidized-bed combustion boiler, is changed with solving existing no external bed
The problem of hot device fluidized-bed combustion boiler is difficult to effectively reduce temperature of charge in material returning device.
In order to achieve the above object, the present invention uses following technical scheme：
A kind of low temperature revert system of fluidized-bed combustion boiler, including separator, the material returning device connected with separator bottom, and
With the desulfurizer connected at the top of separator, the exhanst gas outlet side of desulfurizer is equipped with the first flue gas branch connected with material returning device
Road.
Between separator and desulfurizer air preheater and deduster, air preheater have been sequentially communicated along flue gas flow direction
Smoke inlet side be equipped with the second flue gas branch for being connected with material returning device.
Preferably, the first flue gas branch and the second flue gas branch, which converge, is formed as flue gas main line.
Preferably, the first flue gas branch is equipped with first circulation wind turbine, the first valve, the first airflow meter and the first thermoelectricity
It is even；Second flue gas branch is equipped with second circulation wind turbine, the second valve, the second airflow meter and the second thermocouple.
Preferably, flue gas main line is equipped with three-circulation wind machine, the 3rd airflow meter and three thermocouple.
Preferably, material returning device includes returning charge wind air compartment and fluidized wind air compartment, flue gas main line respectively with returning charge wind air compartment and
Fluidized wind air compartment connects.
Preferably, the pipeline that flue gas main line is connected with returning charge wind air compartment is equipped with returning charge air valve, flue gas main line and stream
The pipeline for changing the connection of wind air compartment is equipped with fluidisation air valve.
Preferably, be formed as U-shaped material returning device equipped with ligulate baffle among material returning device, and the outlet of material returning device and returning charge are oblique
Leg connects.
Preferably, material returning device is equipped with positioned at the returning charge side of ligulate baffle both sides and fluidisation side, wherein returning charge side is with returning
Expect the connection of wind air compartment, fluidisation side is connected with fluidized wind air compartment.
Preferably, vertical feed back pipe is communicated between material returning device and separator.
Beneficial effects of the present invention：
The present invention is substituted existing using empty by regarding the flue gas after boiler desulfurization as returning charge wind and fluidized wind wind regime
Mode of the gas as material returning device returning charge wind and fluidized wind wind regime, the characteristics of making full use of flue gas hypoxemia low temperature after desulfurization so that
Material returning device can suppress material burning, reduce temperature of charge and boiler master in material returning device on the premise of smooth returning charge is ensured
Bed tempertaure, so as to fulfill boiler NOXInitial ejection amount is greatly lowered and fundamentally prevents coking of material returner；Further
Ground, also, so as to suppress material burning, can reduce returning charge using the flue gas before air preheater as returning charge wind and fluidized wind wind regime
Temperature of charge in device.
Brief description of the drawings
Now embodiments of the present invention will be described with reference to appended attached drawing only by way of example, wherein
Fig. 1 is the structure diagram of the low temperature revert system for the fluidized-bed combustion boiler that embodiment of the present invention provides.
In figure：
1st, separator；11st, vertical feed back pipe；12nd, returning charge battered leg；
2nd, material returning device；21st, returning charge wind air compartment；22nd, fluidized wind air compartment；23rd, ligulate baffle；211st, returning charge air valve；212、
Fluidize air valve；221st, returning charge side；222nd, side is fluidized；
3rd, desulfurizer；31st, first circulation wind turbine；32nd, the first airflow meter；33rd, the first thermocouple；34th, the first valve；
4th, air preheater；41st, second circulation wind turbine；42nd, the second airflow meter；43rd, the second thermocouple；44th, the second valve
Door；
5th, deduster；51st, three-circulation wind machine；52nd, the 3rd airflow meter；53rd, three thermocouple；
6th, chimney.
Embodiment
Further illustrate technical scheme below with reference to the accompanying drawings and specific embodiments.
As shown in Figure 1, present embodiments provide for a kind of fluidized-bed combustion boiler, the low temperature revert system of fluidized-bed combustion boiler, bag
Include sequentially connected separator 1, vertical feed back pipe 11, material returning device 2 and returning charge battered leg 12.It is most in the fire coal of fluidized-bed combustion boiler
Uncombusted material is separated by separator 1 (being usually cyclone separator), and will by the material returning device 2 of 1 lower part of separator
Material sends boiler (not shown) back to by returning charge battered leg 12 and burns away, flue gas carried in cyclone separator material do from
The heart moves, and oxygen content of smoke gas is few, and material seldom burns in cyclone separator, and most of material cools down in separation process
Fall into vertical feed back pipe 11, and enter the material returning device 2 of 11 lower part of vertical feed back pipe.
Specifically, flue gas passes through air preheater 4, deduster 5 and desulfurizer 3 respectively after separator 1, finally enters
Chimney 6 drains into air.For flue gas after 3 desulfurization of desulfurizer, its temperature is down to 80 DEG C or so, oxygen content 2.5%~
6.0%, for this reason, set the first flue gas branch from the exhanst gas outlet side of desulfurizer 3, returning charge wind as material returning device 2 and
Fluidized wind wind regime, by replace it is existing use air as returning charge wind and fluidized wind wind regime in a manner of, after making full use of desulfurization
The characteristics of flue gas hypoxemia low temperature so that material returning device 2 can suppress material burning, reduce on the premise of smooth returning charge is ensured
Temperature of charge and the main bed tempertaure of boiler in material returning device 2, so as to fulfill boiler NOXInitial ejection amount is greatly lowered and from basic
On prevent 2 coking of material returning device.
Specifically, the flue gas by deduster 5 and desulfurizer 3 is selected, sulfoxide concentration, dust concentration in flue gas
It is very low with flue-gas temperature, it can prevent the corrosion of circulating fan and be stained with ash.First flue gas branch is equipped with first circulation wind turbine
31, the smoke inlet side of first circulation wind turbine 31 is equipped with the first airflow meter 32, the first thermocouple 33 and the first valve 34.It can pass through
Adjust the frequency conversion aperture of the first valve 34 and first circulation wind turbine 31 and be recycled to the exhaust gas volumn of material returning device 2 to adjust, the first air quantity
Table 32 flows through the exhaust gas volumn of first circulation wind turbine 31 to record, and the first thermocouple 33 measures 3 exhanst gas outlet side of desulfurizer
Temperature.
Specifically, it also can be selected the inlet flue gas in air preheater 4, its temperature range is at 300~320 DEG C, oxygen content
2.5%~6.0%, the smoke inlet side of air preheater 4 is equipped with the second flue gas branch connected with material returning device 2.Second cigarette
Gas branch is equipped with second circulation wind turbine 41, and the smoke inlet side of second circulation wind turbine 41 is equipped with second the 42, second heat of airflow meter
43 and second valve 44 of galvanic couple.Circulation can be adjusted by adjusting the frequency conversion aperture of the second valve 44 and second circulation wind turbine 41
To the exhaust gas volumn of material returning device 2, the second airflow meter 42 flows through the exhaust gas volumn of second circulation wind turbine 41, the second thermocouple 43 to record
To measure the temperature of the smoke inlet side of air preheater 4.
Specifically, the first flue gas branch converges to be formed with the second flue gas branch and is done for supplying the flue gas of 2 wind regime of material returning device
Road.Flue gas main line is equipped with three-circulation wind machine 51, and the exhanst gas outlet side of three-circulation wind machine 51 is equipped with 52 He of the 3rd airflow meter
Three thermocouple 53, and the exhanst gas outlet side on flue gas main line is connected with material returning device 2.Wherein, three-circulation wind machine 51 is preferably sieve
Thatch wind turbine, roots blower are suitable for the gas conveying pressurization of low-pressure occasion, and wide with pressure range of choice, force gas transmission
Feature, it is negative pressure to take full advantage of roots blower entrance in present embodiment, so as to reach the electricity for reducing flue gas recirculation blower fan
Consumption.The outlet air quantity of roots blower is the maximum no more than roots blower type selecting air quantity, to ensure the safe for operation of system.It is logical
Cross the 3rd airflow meter 52 record and flow through the exhaust gas volumn of three-circulation wind machine 51, three thermocouple 53 measures the entrance of material returning device 2
The temperature of flue gas.
Specifically, the outlet air quantity of roots blower can reduce degree and boiler bed tender feeling condition according to 2 temperature of charge of material returning device
It is adjusted flexibly, when material air-teturning temperature is high and boiler bed temperature is high, increases the outlet air quantity of roots blower；When boiler bed temperature is relatively low,
Reduce the outlet air quantity of roots blower.Preferably, present embodiment preferentially selects the flue gas by deduster 5 and desulfurizer 3,
This is because by the flue gas of deduster 5 and desulfurizer 3 compared to the advantages of 4 inlet flue gas of air preheater be temperature more
It is low, and pass through dedusting and desulfurization, do not corrode or be stained with the influence of ash to pipeline, valve and wind turbine.
Specifically, material returning device 2 includes returning charge wind air compartment 21 and fluidized wind air compartment 22, flue gas main line respectively with returning charge wind air compartment
21 connect with fluidized wind air compartment 22, and the pipeline that flue gas main line is connected with returning charge wind air compartment 21 is equipped with returning charge air valve 211, flue gas
The pipeline that main line is connected with fluidized wind air compartment 22 is equipped with fluidisation air valve 212.23 shape of ligulate baffle is equipped among material returning device 2
As U-shaped material returning device, and the outlet of material returning device 2 is connected with returning charge battered leg 12.Material returning device 2, which is equipped with, is located at 23 both sides of ligulate baffle
Returning charge side 221 and fluidisation side 222, wherein returning charge side 221 is corresponding with returning charge wind air compartment 21, fluidizes side 222 and fluidized wind air compartment
22 correspond to.Vertical feed back pipe 11 is communicated between material returning device 2 and separator 1, fluidisation side 222 is located at the bottom of vertical feed back pipe 11, and
It is conllinear with vertical feed back pipe 11.
During concrete application, the flue gas from flue gas main line is sent to 21 He of returning charge wind air compartment respectively after being pressurizeed by roots blower
Fluidized wind air compartment 22.Returning charge air valve 211 and fluidisation air valve can be adjusted according to the combustion position of circulating fluidized bed boiler
212 aperture, control enters the exhaust gas volumn of returning charge wind air compartment 21 and fluidized wind air compartment 22, and then controls the returning charge side of material returning device 2
221 and fluidisation side 222 in exhaust gas volumn, to reach reasonable distribution hypoxemia low-temperature flue gas, so as to fulfill smooth returning charge, shorten material
Passage time in material returning device 2, reduces temperature of charge, pre- anti-coking, ensures boiler safety, stabilization, economical operation.
Obviously, the above embodiment of the present invention is just for the sake of clear explanation example of the present invention, and it is pair to be not
The restriction of embodiments of the present invention.For those of ordinary skill in the field, may be used also on the basis of the above description
To make other variations or changes in different ways.There is no necessity and possibility to exhaust all the enbodiments.It is all this
All any modification, equivalent and improvement made within the spirit and principle of invention etc., should be included in the claims in the present invention
Protection domain within.
Claims (10)
1. a kind of low temperature revert system of fluidized-bed combustion boiler, including separator (1), are returned with what the separator (1) bottom connected
Glassware (2), and the desulfurizer (3) with being connected at the top of the separator (1), it is characterised in that the desulfurizer (3)
Exhanst gas outlet side is equipped with the first flue gas branch connected with the material returning device (2).
2. the low temperature revert system of fluidized-bed combustion boiler according to claim 1, it is characterised in that the separator (1) with
Between the desulfurizer (3) air preheater (4) and deduster (5), the air preheat have been sequentially communicated along flue gas flow direction
The smoke inlet side of device (4) is equipped with the second flue gas branch connected with the material returning device (2).
3. the low temperature revert system of fluidized-bed combustion boiler according to claim 2, it is characterised in that the first flue gas branch
Converge with the second flue gas branch and be formed as flue gas main line.
4. the low temperature revert system of fluidized-bed combustion boiler according to claim 2, it is characterised in that the first flue gas branch
It is equipped with first circulation wind turbine (31), the first airflow meter (32), the first thermocouple (33) and the first valve (34)；Second cigarette
Gas branch is equipped with second circulation wind turbine (41), the second airflow meter (42), the second thermocouple (43) and the second valve (44).
5. the low temperature revert system of fluidized-bed combustion boiler according to claim 3, it is characterised in that set on the flue gas main line
There are three-circulation wind machine (51), the 3rd airflow meter (52) and three thermocouple (53).
6. the low temperature revert system of fluidized-bed combustion boiler according to claim 5, it is characterised in that material returning device (2) bag
Include returning charge wind air compartment (21) and fluidized wind air compartment (22), the flue gas main line respectively with the returning charge wind air compartment (21) and the stream
Change wind air compartment (22) connection.
7. the low temperature revert system of fluidized-bed combustion boiler according to claim 6, it is characterised in that the flue gas main line and institute
The pipeline for stating returning charge wind air compartment (21) connection is equipped with returning charge air valve (211), the flue gas main line and the fluidized wind air compartment
(22) pipeline of connection is equipped with fluidisation air valve (212).
8. the low temperature revert system of fluidized-bed combustion boiler according to claim 6, it is characterised in that in the material returning device (2)
Between equipped with ligulate baffle (23) be formed as U-shaped material returning device, and the outlet of the material returning device (2) is connected with returning charge battered leg (12).
9. the low temperature revert system of fluidized-bed combustion boiler according to claim 8, it is characterised in that on the material returning device (2)
Equipped with positioned at the returning charge side (221) of ligulate baffle (23) both sides and fluidisation side (222), wherein the returning charge side (221) with
Returning charge wind air compartment (21) connection, fluidisation side (222) connect with the fluidized wind air compartment (22).
10. the low temperature revert system of fluidized-bed combustion boiler according to claim 9, it is characterised in that the material returning device (2) with
Vertical feed back pipe (11) is communicated between the separator (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711472404.0A CN107990310B (en) | 2017-12-29 | 2017-12-29 | Low-temperature material returning system of fluidized bed boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711472404.0A CN107990310B (en) | 2017-12-29 | 2017-12-29 | Low-temperature material returning system of fluidized bed boiler |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107990310A true CN107990310A (en) | 2018-05-04 |
| CN107990310B CN107990310B (en) | 2023-07-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711472404.0A Active CN107990310B (en) | 2017-12-29 | 2017-12-29 | Low-temperature material returning system of fluidized bed boiler |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108592072A (en) * | 2018-05-09 | 2018-09-28 | 武汉烽火兴业节能环保科技有限公司 | A kind of gas fired-boiler flue gas waste heat recovery apparatus |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201599791U (en) * | 2010-02-10 | 2010-10-06 | 无锡华光工业锅炉有限公司 | Device for eliminating coking of material returner of fluidized-bed boiler |
| CN102417831A (en) * | 2011-09-28 | 2012-04-18 | 合肥德博生物能源科技有限公司 | Biomass gasification generation system |
| CN203478232U (en) * | 2013-09-12 | 2014-03-12 | 无锡华光工业锅炉有限公司 | U type material returning device for circulating fluidized bed boilers |
| CN207688118U (en) * | 2017-12-29 | 2018-08-03 | 烟台龙源电力技术股份有限公司 | A kind of low temperature revert system of fluidized-bed combustion boiler |
-
2017
- 2017-12-29 CN CN201711472404.0A patent/CN107990310B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201599791U (en) * | 2010-02-10 | 2010-10-06 | 无锡华光工业锅炉有限公司 | Device for eliminating coking of material returner of fluidized-bed boiler |
| CN102417831A (en) * | 2011-09-28 | 2012-04-18 | 合肥德博生物能源科技有限公司 | Biomass gasification generation system |
| CN203478232U (en) * | 2013-09-12 | 2014-03-12 | 无锡华光工业锅炉有限公司 | U type material returning device for circulating fluidized bed boilers |
| CN207688118U (en) * | 2017-12-29 | 2018-08-03 | 烟台龙源电力技术股份有限公司 | A kind of low temperature revert system of fluidized-bed combustion boiler |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108592072A (en) * | 2018-05-09 | 2018-09-28 | 武汉烽火兴业节能环保科技有限公司 | A kind of gas fired-boiler flue gas waste heat recovery apparatus |
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| Publication number | Publication date |
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| CN107990310B (en) | 2023-07-18 |
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