CN106861412A - A kind of high-calcium fly ass of multi-unit plant is shared and resource utilization system and method - Google Patents
A kind of high-calcium fly ass of multi-unit plant is shared and resource utilization system and method Download PDFInfo
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- CN106861412A CN106861412A CN201710220980.XA CN201710220980A CN106861412A CN 106861412 A CN106861412 A CN 106861412A CN 201710220980 A CN201710220980 A CN 201710220980A CN 106861412 A CN106861412 A CN 106861412A
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- Prior art keywords
- fly ass
- calcium fly
- calcium
- fluidized bed
- unit
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-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
- B01D53/508—Sulfur oxides by treating the gases with solids
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/006—Layout of treatment plant
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
Abstract
Shared and resource utilization system and method the invention belongs to fume treatment field, more particularly to a kind of high-calcium fly ass of multi-unit plant.Every unit of the system includes：CFBB, preposition deduster, circulating fluidized bed dry desulfuration absorbing tower, rearmounted deduster and air-introduced machine；All units share a set of high-calcium fly ass distribution system, are arranged in or beyond the flyash feeding circulating fluidized bed dry desulfuration absorbing tower that high-calcium fly ass distribution system can trap preposition deduster according to the calcium oxide content of flyash.The present invention using high-calcium fly ass as circulating fluidized bed dry sulfur removal technology desulfurizing agent, and the high-calcium fly ass amount entered in many circulating fluidized bed dry desulfuration absorbing towers of generating sets and the Class F fly ash amount for draining into flyash storehouse outward are selected and regulated and controled according to the desulfurization demand of many generating sets and the calcium oxide content of flyash using high-calcium fly ass distribution system, realize the high-efficiency resource recycling on the spot of high-calcium fly ass.
Description
Technical field
Shared and resource the invention belongs to fume treatment field, more particularly to a kind of high-calcium fly ass of multi-unit plant
Using system and method.
Background technology
CFBB has that fuel tolerance is wide, Load Regulation ability is strong and Pollutant emission concentration is low excellent
Point.And in coal resources in China 25% be sulphur coal of the sulfur content more than 2%, while the gangue for accumulating reaches 1,500,000,000
Ton, CFBB possesses huge application market in China.Since being introduced from foreign countries, the CFBB of China
Technology is continued to develop, and current China possesses 300MW grades of most in the world CFBBs, has scale the biggest in the world
600MW grades of CFBB.
Because CFBB is compared with pulverized-coal fired boiler, ignition temperature is lower, about 850-950 DEG C, therefore, burning life
Into thermal NO x amounts it is less；Meanwhile, the optimum response area of 850-950 DEG C of combustion reference temperature exactly furnace sorbent injection desulfurization
Between, by desulfuration in furnace, CFBB SO2Discharge can be controlled in relatively low level.As China is to coal-burning power plant
The increasingly raising of flue gas pollutant emission request, the application of CFBB is more and more extensive.
Desulphurization in circulating fluidized bed boiler is, by the use of agstone as desulfurizing agent, agstone to be put into boiler,
Be sintered into quick lime under the high temperature action of coal burning, then with flue gas in SO2The process of reaction generation calcium sulfate.In circulation
During fluidized-bed combustion boiler desulfuration in furnace, can produce and contain CaSO4With the flyash of CaO；Desulfuration in furnace calcium sulfur ratio is different, powder
Calcium oxide content is different in coal ash.When CaO content is less than 10% in flyash, referred to as Class F fly ash；When desulfuration in furnace calcium
When sulphur is higher, CaO content is higher than 10%, even as high as 20%~40% in flyash, is also called high-calcium fly ass.Research table
Bright, CaO content is significantly higher than the national standard on brickmaking and concrete in high-calcium fly ass, and even above brick and coagulation is autochthonal
Produce the requirement higher limit of producer, it is difficult to comprehensively utilize, be typically only capable to be processed by the way of grey field storage, cause substantial amounts of
CaO not using and waste.
The content of the invention
In view of this, it is shared sharp with resource it is an object of the invention to provide a kind of high-calcium fly ass of multi-unit plant
With system and method, the system and method that the present invention is provided can realize the efficient resource of the high-calcium fly ass of multicomputer coal fired power plant
Change and utilize.
Shared the invention provides a kind of high-calcium fly ass of multi-unit plant and resource utilization system, every unit bag
Include：
CFBB；
The preposition deduster that smoke inlet is connected with the exhanst gas outlet of CFBB；
The circulating fluidized bed dry desulfuration absorbing tower that smoke inlet is connected with the exhanst gas outlet of preposition deduster；
The rearmounted deduster that smoke inlet is connected with the exhanst gas outlet of circulating fluidized bed dry desulfuration absorbing tower；
The air-introduced machine being connected with the exhanst gas outlet of rearmounted deduster with smoke inlet；
All units share a set of high-calcium fly ass distribution system, the entrance of high-calcium fly ass distribution system and every unit
The ash hole of preposition deduster be connected, high-calcium fly ass distribution system can be according to the calcium oxide content of flyash by preposition dedusting
Row in or beyond the flyash feeding circulating fluidized bed dry desulfuration absorbing tower of device trapping.
Preferably, the high-calcium fly ass distribution system includes high-calcium fly ass distribution terminal and multiple high-calcium fly asses
Storehouse；The ash inlet of high-calcium fly ass distribution terminal is connected with the ash hole of every preposition deduster of unit, high-calcium fly ass
The ash hole for distributing terminal is connected with the ash inlet in every high-calcium fly ass storehouse of unit, every high-calcium fly ass storehouse of unit
High-calcium fly ass import of the ash hole respectively with the circulating fluidized bed dry desulfuration absorbing tower of the unit be connected；High-calcium fly ass
One-level distribution is provided with ash inlet and the every connecting line of the ash hole of the preposition deduster of unit for distributing terminal defeated
Send device and middle storage delivery adjustment device；The ash hole of high-calcium fly ass distribution terminal and every high-calcium fly ass storehouse of unit
Ash inlet connecting line on be provided with secondary distribution conveying device.
Preferably, the high-calcium fly ass distribution system also includes flyash storehouse, the ash inlet in flyash storehouse and every machine
The ash hole of the preposition deduster of group is connected；The ash inlet in flyash storehouse and every company of the ash hole of the preposition deduster of unit
One-level distribution conveying device and outer row's delivery adjustment device are provided with adapter road.
Preferably, the system also include auxiliary absorbent feeding mechanism, the discharging opening of auxiliary absorbent feeding mechanism with
The auxiliary absorbent import of circulating fluidized bed dry desulfuration absorbing tower is connected.
Preferably, the system also includes desulfurizing byproduct circulation and outer arranging device；Desulfurizing byproduct is circulated and outer row dress
The ash inlet put is connected with the ash hole of rearmounted deduster, and desulfurizing byproduct circulation and outer arranging device can be removed rearmounted as needed
The desulfurizing byproduct of dirt device trapping loops back row in or beyond circulating fluidized bed dry desulfuration absorbing tower.
Preferably, the high-calcium fly ass import of the ash hole in the high-calcium fly ass storehouse and circulating fluidized bed dry desulfurizing tower
It is connected；Gone back on the ash hole in high-calcium fly ass storehouse and the connecting line of the high-calcium fly ass import of circulating fluidized bed dry desulfurizing tower
High-calcium fly ass metering device, high-calcium fly ass feed adjusting means and high-calcium fly ass are provided with to material conveying device.
It is common the invention provides a kind of high-calcium fly ass that multi-unit plant is carried out in system described in above-mentioned technical proposal
The method with recycling is enjoyed, is comprised the following steps：
A), many desulfuration in furnace flue gases of the desulphurization in circulating fluidized bed boiler generation of generating set are through preposition deduster
Treatment, obtains flyash and preceding dedusting flue gas；
B), flyash passes through flue gas desulfurization of the high-calcium fly ass distribution system according to calcium oxide content and Duo Tai generating sets
Demand sends into row in or beyond many circulating fluidized bed dry desulfuration absorbing towers of generating set；
C), preceding dedusting flue gas is entered as desulfurization absorbent using high-calcium fly ass in circulating fluidized bed dry desulfuration absorbing tower
Row desulfurization, obtains the flue gas containing desulfurizing byproduct；
D), the flue gas containing desulfurizing byproduct is processed through rearmounted deduster, obtains desulfurizing byproduct and rear dedusting flue gas.
Preferably, the calcium oxide content of the high-calcium fly ass in feeding circulating fluidized bed dry desulfuration absorbing tower exists
More than 10wt%.
Preferably, SO in the desulfuration in furnace flue gas2Concentration is higher than 500mg/Nm3When, auxiliary absorbent is sent into recycle stream
Changing in bed dry desulfurization absorbing tower carries out auxiliary desulfurization.
Preferably, in step c), the calcium sulfur ratio of the desulfurization is not higher than 3.0.
Compared with prior art, shared and recycling the invention provides a kind of high-calcium fly ass of multi-unit plant
System and method.Every unit of the system includes：CFBB；The flue gas of smoke inlet and CFBB
The connected preposition deduster of outlet；The circulating fluidized bed dry desulfurization that smoke inlet is connected with the exhanst gas outlet of preposition deduster is inhaled
Receive tower；The rearmounted deduster that smoke inlet is connected with the exhanst gas outlet of circulating fluidized bed dry desulfuration absorbing tower；And smoke inlet
The air-introduced machine being connected with the exhanst gas outlet of rearmounted deduster；All units share a set of high-calcium fly ass distribution system, high-calcium powder
The entrance of coal ash distribution system is connected with the ash hole of every preposition deduster of unit, and high-calcium fly ass distribution system can basis
In or beyond the flyash feeding circulating fluidized bed dry desulfuration absorbing tower that the calcium oxide content of flyash traps preposition deduster
Row.In the present invention, the desulfuration in furnace flue gas of many desulphurization in circulating fluidized bed boiler generations of generating set is removed through preposition
The treatment of dirt device, obtains flyash and preceding dedusting flue gas；The high-calcium fly ass of high oxidation calcium content is by high-calcium fly ass point afterwards
Match system is sent into many circulating fluidized bed dry desulfuration absorbing towers of generating set, preceding dedusting flue gas using high-calcium fly ass as
Desulfurization absorbent carries out desulfurization in circulating fluidized bed dry desulfuration absorbing tower, obtains the flue gas containing desulfurizing byproduct；Finally contain
The flue gas of desulfurizing byproduct is processed through rearmounted deduster, obtains desulfurizing byproduct and rear dedusting flue gas.The present invention is by high calcium fine coal
The grey desulfurizing agent as circulating fluidized bed dry sulfur removal technology, and using high-calcium fly ass distribution system according to many generating sets
Desulfurization demand and flyash calcium oxide content in the circulating fluidized bed dry desulfuration absorbing towers for entering many generating sets
High-calcium fly ass amount and drain into the Class F fly ash amount in flyash storehouse outward and selected and regulated and controled, make the low of suboxides calcium content
Utilization is sold outside calcium fly ash, high-calcium fly ass is carried out to sulfur dioxide in flue gas in circulating fluidized bed dry desulfuration absorbing tower
Efficient removal, so that whole many units of coal fired power plant obtain the clean flue gas of ultralow content of sulfur dioxide, realizes high calcium
The high-efficiency resource recycling on the spot of flyash, improves the comprehensive benefit of fired power generating unit.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
The accompanying drawing to be used needed for having technology description is briefly described, it should be apparent that, drawings in the following description are only this
Inventive embodiment, for those of ordinary skill in the art, on the premise of not paying creative work, can also basis
The accompanying drawing of offer obtains other accompanying drawings.
Fig. 1 is that the high-calcium fly ass of multi-unit plant provided in an embodiment of the present invention is shared and resource utilization system flow
Figure；
Fig. 2 is high-calcium fly ass distribution system workflow diagram provided in an embodiment of the present invention.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of protection of the invention.
Shared the invention provides a kind of high-calcium fly ass of multi-unit plant and resource utilization system, every unit bag
Include：
CFBB；
The preposition deduster that smoke inlet is connected with the exhanst gas outlet of CFBB；
The circulating fluidized bed dry desulfuration absorbing tower that smoke inlet is connected with the exhanst gas outlet of preposition deduster；
The rearmounted deduster that smoke inlet is connected with the exhanst gas outlet of circulating fluidized bed dry desulfuration absorbing tower；
The air-introduced machine being connected with the exhanst gas outlet of rearmounted deduster with smoke inlet；
All units share a set of high-calcium fly ass distribution system, the entrance of high-calcium fly ass distribution system and every unit
The ash hole of preposition deduster be connected, high-calcium fly ass distribution system can be according to the calcium oxide content of flyash by preposition dedusting
Row in or beyond the flyash feeding circulating fluidized bed dry desulfuration absorbing tower of device trapping.
Referring to Fig. 1, Fig. 1 is that the high-calcium fly ass of multi-unit plant provided in an embodiment of the present invention is shared and recycling
System flow chart.In Fig. 1,1 is preposition deduster, and 2 is high-calcium fly ass distribution system, and 31 inhale for circulating fluidized bed dry desulfurization
Tower is received, 32 is rearmounted deduster, and 3 is circulating fluidized bed dry desulfation dust-extraction device, and 4 is air-introduced machine, and 33 supply for auxiliary absorbent
Device is answered, 34 is desulfurizing byproduct circulation and outer arranging device；F1 is desulfuration in furnace flue gas, F2 is preceding dedusting flue gas, F3 is removed after being
Cloud of dust gas, L1 are atomization process water.
The high-calcium fly ass of the multi-unit plant that the present invention is provided is shared and resource utilization system includes recirculating fluidized bed
Boiler, preposition deduster 1, high-calcium fly ass distribution system 2, circulating fluidized bed dry desulfuration absorbing tower 31, rearmounted deduster 32,
Auxiliary absorbent feeding mechanism 33, desulfurizing byproduct is circulated and outer arranging device 34 and air-introduced machine 4.
Wherein, the smoke inlet of preposition deduster 1 is connected with the exhanst gas outlet of CFBB, is circulated for trapping
Flyash in the desulfuration in furnace flue gas of fluidized-bed combustion boiler.In the present invention, preposition deduster 1 is dry collector, specifically may be used
To select electric cleaner, sack cleaner or electrostatic fabric filter, preferably electric cleaner.
In the present invention, circulating fluidized bed dry desulfuration absorbing tower 31 is used to further take off preceding dedusting flue gas F1
Sulphur, the smoke inlet of circulating fluidized bed dry desulfuration absorbing tower 31 is connected with the exhanst gas outlet of preposition deduster 1.In the present invention
In, high-calcium fly ass import, the high oxidation calcium of the trapping of preposition deduster 1 are provided with circulating fluidized bed dry desulfuration absorbing tower 31
The high-calcium fly ass of content is delivered to the high calcium of circulating fluidized bed dry desulfuration absorbing tower 31 by high-calcium fly ass distribution system 2
Flyash import, using high-calcium fly ass as desulfurization absorbent.In the present invention, on circulating fluidized bed dry desulfuration absorbing tower 31
Auxiliary absorbent import is additionally provided with, when exclusive use high-calcium fly ass is difficult to meet desulfurization requirement as absorbent, is passed through
Auxiliary absorbent import supplements auxiliary absorbent to circulating fluidized bed dry desulfuration absorbing tower 31.In the present invention, it is provided with auxiliary
Absorbefacient feeding mechanism 33, auxiliary absorbent import and the auxiliary absorbent of circulating fluidized bed dry desulfuration absorbing tower 31 are supplied
The discharging opening of device 33 is connected.In the present invention, it is additionally provided with atomization process water on circulating fluidized bed dry desulfuration absorbing tower 31
Import, is passages of the atomization process water L1 into the inner chamber of circulating fluidized bed dry desulfuration absorbing tower 31.
In the present invention, rearmounted deduster 32 is used to take off desulfurization generation in circulating fluidized bed dry desulfuration absorbing tower 31
Sulphur accessory substance is trapped, the smoke inlet of rearmounted deduster 32 and the exhanst gas outlet of circulating fluidized bed dry desulfuration absorbing tower 31
It is connected.In the present invention, rearmounted deduster 32 is dry collector, can specifically select electric cleaner, sack cleaner or electricity
Bag dust collector, preferably sack cleaner.In the present invention, the system preferably also includes desulfurizing byproduct circulation and outer row dress
34 are put, the ash hole of rearmounted deduster 32 is circulated with desulfurizing byproduct and the ash inlet of outer arranging device 34 is connected.In the present invention,
Flue gas enters rearmounted deduster 32, and the desulfurizing byproduct that flue gas is carried is captured down into desulfurizing byproduct circulation and outer row dress
34 are put, a part returns to desulfurization again in circulating fluidized bed dry desulfuration absorbing tower 31, improve desulfuration efficiency and unreacted CaO
Utilization rate；Arranged outside another part desulfurizing byproduct, then ash disposal area or comprehensive utilization point are delivered to by grey tank car.
In the present invention, the exhanst gas outlet of rearmounted deduster 32 is provided with air-introduced machine 4, the exhanst gas outlet and cigarette of air-introduced machine 4
The smoke inlet of chimney is connected, and the flue gas after the treatment of rearmounted deduster 32 is delivered to chimney via air-introduced machine 4, and by smoke stack emission
To air.
In the present invention, the ash discharge that the entrance of high-calcium fly ass distribution system 2 is trapped with many preposition dedusters 1 of unit
Mouth is connected, and the flyash that preposition deduster 1 is trapped can be sent into many recycle streams of unit according to the calcium oxide content of flyash
Change row in or beyond bed dry desulfurization absorbing tower 31.
Referring to Fig. 2, Fig. 2 is high-calcium fly ass distribution system workflow diagram provided in an embodiment of the present invention.In Fig. 2,1#,
2#, 3# ..., the 1# that n# is same coal fired power plant, 2#, 3# ..., n# generating sets；1 is preposition deduster, and 31 is ciculation fluidized
Bed dry desulfurization absorbing tower；A1 is that one-level distributes conveying device, and A21 is outer row's delivery adjustment device, and A22 is middle storage feed adjustment
Device, A23 sells adjusting means for outer, and A24 teases and ridicule regulating device for promptly outer, and A31 is flyash storehouse, and A32 is high-calcium fly ass point
With terminal, A2 is secondary distribution conveying device, and A33 is high-calcium fly ass storehouse, and A3 is high-calcium fly ass metering device, and A26 is
High-calcium fly ass is fed adjusting means, and A4 is high-calcium fly ass to material conveying device.
High-calcium fly ass distribution system 2 preferably includes high-calcium fly ass distribution terminal A32, for storing many units
The high-calcium fly ass of the trapping of preposition deduster 1, and many high-calcium fly ass storehouse A33 of unit；High-calcium fly ass distributes terminal
The ash inlet of A32 is connected with the ash hole of every preposition deduster 1 of unit, the ash discharge of high-calcium fly ass distribution terminal A32
Mouth is connected with the ash inlet of every high-calcium fly ass storehouse A33 of unit, every ash hole of the high-calcium fly ass storehouse A33 of unit point
High-calcium fly ass import not with the circulating fluidized bed dry desulfuration absorbing tower 31 of the unit is connected.In the present invention, high-calcium powder
It is preferably provided with ash inlet of the ash content of coal with terminal A32 and every connecting line of the ash hole of the preposition deduster 1 of unit
There is one-level to distribute conveying device A1 and middle storage delivery adjustment device A22, the high calcium fine coal of condition is met for adjusting every unit
Grey Storing and conveying amount.In the present invention, the ash hole and every high-calcium fly ass of unit of high-calcium fly ass distribution terminal A32
Secondary distribution conveying device A2 preferably is additionally provided with the connecting line of the ash inlet of storehouse A33, for according to every need of unit
Convey high-calcium fly ass.In the present invention, the recycle stream of every ash hole of the high-calcium fly ass storehouse A33 of unit and the unit
High-calcium fly ass metering dress is preferably additionally provided with the connecting line of the high-calcium fly ass import for changing bed dry desulfurization absorbing tower 31
Put A3, high-calcium fly ass feed adjusting means A26 and high-calcium fly ass and give material conveying device A4, for the flue gas according to each unit
Desulfurization needs accurate metering and regulation high-calcium fly ass feeding coal.In the present invention, high-calcium fly ass distribution terminal A32 is preferably also
It is provided with and mouth is arranged outside urgent, urgent outer row's mouth is connected with outside promptly teases and ridicule regulating device A24, in the urgent feelings such as unit trouble hunting
Outer row's high-calcium fly ass under condition.
In the present invention, high-calcium fly ass distribution system 2 preferably also includes flyash storehouse A31, for storing many units
The trapping of preposition deduster 1 suboxides calcium content Class F fly ash, before the ash inlet of flyash storehouse A31 and every unit
The ash hole for putting deduster 1 is connected.In the present invention, the ash inlet of flyash storehouse A31 and every preposition deduster 1 of unit
One-level distribution conveying device A1 and outer row's delivery adjustment device A21 is preferably provided with the connected pipeline of ash hole, for regulating and controlling
The outer row conveying of Class F fly ash.In the present invention, one-level distribution conveying device A1 be preferably arranged in flyash storehouse A31,
On the public pipeline that high-calcium fly ass distribution terminal A32 is connected with the preposition deduster 1 of every unit, i.e., the every powder of unit
The middle storage conveying and outer row conveying of coal ash share same set of one-level distribution conveying device.
It can be seen that, in the present invention, flyash takes off according to calcium oxide content, every unit flue gas in every flyash of unit
There can be multiple difference whereabouts the need for sulphur.In one embodiment that the present invention is provided, can in such a way regulate and control fine coal
Grey whereabouts：
When calcium oxide content detected value is less than required value in the flyash that the preposition deduster 1 of certain unit is trapped
When, 10% is such as less than, outer row delivery adjustment device A21 is opened, delivery adjustment device A22 is stored up in closing, Class F fly ash is drained into
Flyash storehouse A31, then sold by the transport of grey tank car is outer；When calcium oxide content detected value meets the requirements in flyash, such as it is higher than
10%, outer row delivery adjustment device A21 is closed, delivery adjustment device A22 is stored up in unlatching, high-calcium fly ass is delivered to high calcium fine coal
Ash content is stored with terminal A32.The flyash of other units trapping realizes selectively storage or outer by identical control mode
Row.In actual motion, can by testing and analyzing different boiler loads and desulfuration in furnace operating mode in advance under the calcium oxide of flyash contain
Amount, draws the homologous thread of unit operating condition-flyash calcium oxide content, and set up flyash storage or the control of outer row with this
Logic processed.
When high-calcium fly ass storage capacity is not enough in certain the high-calcium fly ass storehouse of unit, two fractions of this unit are opened
With conveying device A2, the high-calcium fly ass of high-calcium fly ass distribution terminal A32 storages is delivered to the high-calcium powder of this unit
Coal ash storehouse A33.Meanwhile, the flue gas desulfurization needs according to this unit adjust the high-calcium fly ass feed regulation dress of this unit
A26 is put, by a certain amount of high-calcium fly ass via high-calcium fly ass metering device A3, high-calcium fly ass feed adjusting means A26
With high-calcium fly ass to material conveying device A4 after, send into the circulating fluidized bed dry desulfuration absorbing tower 31 of this unit.At this
In invention, every preferred storage of the high-calcium fly ass storehouse A33 of unit meets the 3 days high calcium fine coal of consumption of this units gas desulfurization
Ash.When the high-calcium fly ass storehouse A33 of this unit need not feed, the secondary distribution conveying device A2 of the unit is closed, while
According to other unit high-calcium fly ass storehouse material position situations, the secondary distribution conveying device A2 of other units is opened, meet many machines
The flue gas desulfurization of group needs.The shared of many high-calcium fly asses of unit of same coal fired power plant is realized by above procedure and is divided
Match somebody with somebody, improve the resource utilization rate of high-calcium fly ass.
In the present invention, many desulfuration in furnace flue gases of the desulphurization in circulating fluidized bed boiler generation of unit are through every machine
The preposition deduster treatment of group, obtains flyash and preceding dedusting flue gas；The high-calcium fly ass of high oxidation calcium content is by height afterwards
Calcium fly ash distribution system is sent into each circulating fluidized bed dry desulfuration absorbing tower of unit, and preceding dedusting flue gas is with high calcium fine coal
Ash carries out desulfurization as desulfurization absorbent in circulating fluidized bed dry desulfuration absorbing tower, obtains the flue gas containing desulfurizing byproduct；
Finally the flue gas containing desulfurizing byproduct is processed through rearmounted deduster, obtains desulfurizing byproduct and rear dedusting flue gas.The present invention is by height
Calcium fly ash as circulating fluidized bed dry sulfur removal technology desulfurizing agent, and using high-calcium fly ass distribution system to enter many
High-calcium fly ass amount in the circulating fluidized bed dry desulfuration absorbing tower of unit is regulated and controled, and makes high-calcium fly ass ciculation fluidized
To sulfur dioxide in flue gas efficient removal in bed dry desulfurization absorbing tower, so as to obtain the clean cigarette of ultralow content of sulfur dioxide
Gas, realizes the high-efficiency resource recycling on the spot of high-calcium fly ass, improves the comprehensive benefit of fired power generating unit.
It is common the invention provides a kind of high-calcium fly ass that multi-unit plant is carried out in system described in above-mentioned technical proposal
The method with recycling is enjoyed, is comprised the following steps：
A), many desulfuration in furnace flue gases of the desulphurization in circulating fluidized bed boiler generation of generating set are through preposition deduster
Treatment, obtains flyash and preceding dedusting flue gas；
B), flyash passes through flue gas desulfurization of the high-calcium fly ass distribution system according to calcium oxide content and Duo Tai generating sets
Demand sends into row in or beyond many circulating fluidized bed dry desulfuration absorbing towers of generating set；
C), preceding dedusting flue gas is entered as desulfurization absorbent using high-calcium fly ass in circulating fluidized bed dry desulfuration absorbing tower
Row desulfurization, obtains the flue gas containing desulfurizing byproduct；
D), the flue gas containing desulfurizing byproduct is processed through rearmounted deduster, obtains desulfurizing byproduct and rear dedusting flue gas.
In the method that the present invention is provided, the desulfuration in furnace flue gas that desulphurization in circulating fluidized bed boiler is produced is premenstrual first
Put deduster treatment.Wherein, SO in the desulfuration in furnace flue gas2Concentration is preferably shorter than 2000mg/Nm3, more preferably less than 500mg/
Nm3；The temperature of the desulfuration in furnace flue gas is preferably 100~150 DEG C, more preferably 120~140 DEG C.There is provided in the present invention
In embodiment, the exhaust gas volumn of the desulfuration in furnace flue gas is 500000~2000000m3/ h, concretely 1750000 He
810000m3/h.After flue gas is processed through preposition deduster, flyash and preceding dedusting flue gas are obtained.
After obtaining flyash and preceding dedusting flue gas, the high-calcium fly ass of high oxidation calcium content is distributed by high-calcium fly ass and is
In system feeding circulating fluidized bed dry desulfuration absorbing tower；Preceding dedusting flue gas is using high-calcium fly ass as desulfurization absorbent in recycle stream
Changing in bed dry desulfurization absorbing tower carries out desulfurization.In the present invention, the high-calcium fly ass distribution system preferably contains calcium oxide
Measure in the high-calcium fly ass feeding circulating fluidized bed dry desulfuration absorbing tower of more than 10wt%, more preferably convey calcium oxide content
It is the high-calcium fly ass of 20~40wt%.In the present invention, the desulfurization calcium sulphur using high-calcium fly ass as desulfurization absorbent
Than being preferably no greater than 3.0,2.5 are more elected as.In the present invention, when only cannot meeting de- as desulfurization absorbent using high-calcium fly ass
When sulphur needs, preferably to adding auxiliary absorbent in circulating fluidized bed dry desulfuration absorbing tower, the auxiliary absorbent include but
It is not limited to calcium hydroxide.In the embodiment that the present invention is provided, the SO preferably in the desulfuration in furnace flue gas2Concentration is higher than 500mg/
Nm3When, auxiliary absorbent is sent into circulating fluidized bed dry desulfuration absorbing tower carries out auxiliary desulfurization.In the reality that the present invention is provided
Apply in example, in sweetening process, the atomization process water consumption of separate unit circulating fluidized bed dry desulfuration absorbing tower is 12~30t/h；Follow
The running temperature of ring fluid bed dry desulfurization absorbing tower is preferably 70~90 DEG C, concretely 80 DEG C or 85 DEG C；Recirculating fluidized bed
The bed pressure drop of dry desulfurization absorbing tower is preferably 0.6~1.4kPa, concretely 1.1kPa.Preceding dedusting flue gas is through ciculation fluidized
After bed dry desulfurization absorbing tower treatment, the flue gas containing desulfurizing byproduct is obtained.
After obtaining the flue gas containing desulfurizing byproduct, the flue gas process through rearmounted deduster, obtains desulfurizing byproduct with after
Dedusting flue gas.Dedusting flue gas is through smoke stack emission to outside atmosphere afterwards.In one embodiment that the present invention is provided, the rear dedusting
The SO of flue gas2Concentration is less than 35mg/Nm3。
The method that the present invention is provided and utilizes high-calcium fly ass as the desulfurizing agent of circulating fluidized bed dry sulfur removal technology
High-calcium fly ass distribution system selective oxidation calcium content meets the high-calcium fly ass of condition, according to many of the same power station cigarette of unit
Desulfurization needs, and qualified high-calcium fly ass is shared and distributed, and is done to entering every recirculating fluidized bed of unit
High-calcium fly ass amount in method desulfuration absorbing tower is regulated and controled, and be delivered to for high-calcium fly ass by the ruuning situation according to every unit
To sulfur dioxide in flue gas efficient removal in the circulating fluidized bed dry desulfuration absorbing tower of each unit, so as to obtain ultralow titanium dioxide
The clean flue gas of sulfur content, realize the high-efficiency resource recycling on the spot of high-calcium fly ass, improve the comprehensive effect of fired power generating unit
Benefit.
Compared to prior art, the high-calcium fly ass of the multi-unit plant that the present invention is carried is shared and resource utilization system and
Method, and optimal technical scheme has following specific advantage：
1) high-calcium fly ass of the multi-unit plant that the present invention is provided is shared and resource utilization method, by many units
After the flyash that CFBB is produced is trapped with preposition deduster, selected by high-calcium fly ass distribution system,
Storage and distribution, the high-calcium fly ass of high oxidation calcium content send into the circulating fluidized bed dry desulfation dust-extraction device of each unit, profit
With bed fine and close in circulating fluidized bed dry desulfuration absorbing tower and the atomization moisture film for spraying into, with SO in flue gas2Deng sour gas
The quick ionic reaction of generation, realizes to SO in flue gas2Deng the efficient removal of pollutant.
2) high-calcium fly ass distribution system plays adjustment effect simultaneously with auxiliary absorbent feeding mechanism：On the one hand, according to
The flue gas desulfurizations of many units need, by controlling every desulfuration in furnace operating mode of unit with controlling every flyash of unit
Calcium oxide content, and then the Class F fly ash ratio and the high-calcium fly ass ratio of flue gas desulfurization of the outer row in whole power station are adjusted,
At utmost lift the comprehensive utilization benefit of high-calcium fly ass；On the other hand, it is de- according to every circulating fluidized bed dry of unit
Sulphur absorption tower inlet flue gas sulfur dioxide concentration and exiting flue gas sulfur dioxide concentration scope, control the conveying capacity of high-calcium fly ass
With the magnitude of recruitment of auxiliary absorbent, it is to avoid during SO 2 from fume excessive concentration, high-calcium fly ass removing scarce capacity is caused
Discharge excessive problem, and under can avoiding the low sulfur dioxide operating mode of entrance, put into the calcium oxide profit that excessive high-calcium fly ass is caused
With the low problem of rate.
3) when a coal fired power plant is built simultaneously there are many units, can be balanced respectively by high-calcium fly ass distribution system
The high-calcium fly ass demand of platform unit, farthest lifts high-calcium fly ass resource utilization rate.Importantly, this hair
The high-calcium fly ass of the multi-unit plant of bright offer is shared and resource utilization system is not by the shadow of unit air-introduced machine arrangement form
Ring, place strong adaptability.
4) using the coalescence granulating property of circulating fluidized bed dry desulfuration absorbing tower, rearmounted deduster is made to realize to fine
The efficient trapping of soot dust granule, it is ensured that the minimum discharge of flue dust.The desulfurizing byproduct of rearmounted deduster trapping passes through desulfurization pair
Product circulation and outer arranging device are sent back in absorption tower, and the calcium oxide not reacted completely is able to further participate in desulfurization in tower anti-
Should, the utilization rate of calcium oxide in the desulfuration efficiency of desulfuration absorbing tower and high-calcium fly ass has been effectively ensured.
For the sake of becoming apparent from, it is described in detail below by following examples.
Embodiment 1
The high-calcium fly ass of multi-unit plant is shared and resource utilization system
The high-calcium fly ass of the multi-unit plant a kind of as shown in Figure 1 that the present embodiment is provided is shared and recycling system
System, including CFBB, preposition deduster 1, the high-calcium fly ass distribution system set gradually along flow of flue gas direction
2nd, circulating fluidized bed dry desulfuration absorbing tower 31, rearmounted deduster 32, air-introduced machine 4 and chimney.
In the present embodiment, the ash hole of many preposition dedusters 1 of unit is connected with one-level distribution conveying device A1, often
The outlet of the one-level distribution conveying device A1 of platform unit is connected in parallel to outer row's delivery adjustment device A21 and middle storage feed adjustment dress
Put A22；Every outer row's delivery adjustment device A21 of unit is connected with public flyash storehouse A31；Every middle storage conveying of unit
Adjusting means A22 is connected with the ash inlet of public high-calcium fly ass distribution terminal A32, high-calcium fly ass distribution terminal
Secondary distribution conveying device A2 of the ash hole of A32 also with every unit is connected；Every secondary distribution conveying device A2 of unit
Ash inlet with the high-calcium fly ass storehouse A33 of the unit is connected, every ash hole of the high-calcium fly ass storehouse A33 of unit and the machine
The high-calcium fly ass import of the circulating fluidized bed dry desulfuration absorbing tower 31 of group is connected；Along high-calcium fly ass conveying direction, high calcium
On the connecting line of the ash hole of fine coal ash silo A33 and the high-calcium fly ass import of circulating fluidized bed dry desulfuration absorbing tower 31 according to
It is secondary to be provided with high-calcium fly ass metering device A3, high-calcium fly ass feed adjusting means A26 and high-calcium fly ass feed conveying dress
Put A4.In the present embodiment, above-mentioned each device constitutes the high-calcium fly ass distribution system 2 as shown in Figure 2 of the present embodiment.
In the present embodiment, circulating fluidized bed dry desulfuration absorbing tower 31, rearmounted deduster 32 and connect therebetween
Pipeline collectively constituted circulating fluidized bed dry desulfation dust-extraction device 3.Every circulating fluidized bed dry desulfurization of unit absorbs
Atomization process water L1 imports are provided with tower 31；In the present embodiment, also including auxiliary absorbent feeding mechanism 33 and desulfurization pair
Product circulation and discharging system 34.
Shared and resource utilization system the specific works mistake of the high-calcium fly ass of the multi-unit plant that the present embodiment is provided
Journey is as follows：
First, to agstone is put into CFBB, agstone calcines generation calcium oxide in stove, then joins
With desulfuration in furnace reaction, the flyash formed after coal burning and desulfuration in furnace is with desulfuration in furnace flue gas F1 into preposition deduster
1, most flyash are captured.Preceding dedusting flue gas F2 enters the circulating fluidized bed dry desulfation dust-extraction device 3 of afterbody, through de-
Rear dedusting flue gas F3 after sulphur udst separation discharges chimney under the effect of desulfurization air-introduced machine 4.
The flyash trapped through preposition deduster 1 enters high-calcium fly ass distribution system 2.In one-level distribution conveying dress
Put under A1 effects, flyash there can be multiple difference whereabouts.When calcium oxide content is less than 10wt% in flyash, outer row is opened defeated
Adjusting means A21 is sent, delivery adjustment device A22 is stored up in closing, Class F fly ash is drained into flyash storehouse A31, then by grey tank car
Transport is outer to sell；Such as it is higher than 10% when calcium oxide content meets the requirements in flyash, closes outer row delivery adjustment device A21, opens
Middle storage delivery adjustment device A22 is opened, high-calcium fly ass is delivered to high-calcium fly ass distribution terminal A32 storages.
When the high-calcium fly ass storehouse A33 high-calcium fly asses storage capacity of certain unit is not enough, open this unit two grades
Distribution conveying device A2, the high-calcium fly ass of high-calcium fly ass distribution terminal A32 storages is delivered to the high calcium of this unit
Fine coal ash silo A33.Meanwhile, the sulfur dioxide concentration of preceding dedusting flue gas F2 and rear dedusting flue gas F3 according to this unit, regulation
The high-calcium fly ass feed adjusting means A26 of this unit, a certain amount of high-calcium fly ass is measured via high-calcium fly ass and is filled
After A3, high-calcium fly ass feed adjusting means A26 and high-calcium fly ass are put to material conveying device A4, the circulation of this unit is sent into
In fluid bed dry desulfurization absorbing tower 31, atomization process water L1, high-calcium fly ass and SO in flue gas are sprayed into2Occur Deng sour gas
Quick ionic reaction, SO in removing flue gas2。
When the high-calcium fly ass storehouse A33 of this unit need not feed, the secondary distribution conveying device A2 of the unit is closed,
Simultaneously according to other unit high-calcium fly ass storehouse material position situations, the secondary distribution conveying device A2 of other units is opened, with simultaneously
Meet many flue gas desulfurization needs of unit.Realize that by above procedure many high-calcium fly asses of unit in same power station are total to
Enjoy and distribute.
As absorption tower entrance SO2Concentration is higher than 500mg/Nm3When, open auxiliary absorbent feeding mechanism 33, auxiliary absorbent
Via in the input circulating fluidized bed dry of auxiliary absorbent feeding mechanism 33 desulfuration absorbing tower 31, auxiliary desulfurization is participated in, it is ensured that cigarette
Chimney entrance SO2Concentration meets emission request.
Flue gas after desulfurization enters rearmounted deduster 32, and the desulfurizing byproduct that flue gas is carried is captured down, and a part is de-
Sulphur accessory substance sends desulfurization again in circulating fluidized bed dry desulfuration absorbing tower 31 back to through desulfurizing byproduct circulation and outer arranging device 34,
Improve the utilization rate of desulfuration efficiency and unreacted calcium oxide；A part of desulfurizing byproduct is filled through desulfurizing byproduct circulation and outer row
34 outer rows are put, then appointed place is transported to by grey tank car.
Embodiment 2
The high-calcium fly ass that multi-unit plant is carried out in the system that embodiment 1 is provided is shared and recycling, with certain
As a example by the separate unit 300MW grades of unit in one power station, specific implementation situation is as follows：
The CFBB of 300MW grading scales provides former flue gas, former flue gas SO during non-desulfurization in stove2Concentration is
2000mg/Nm3, the SO in former flue gas after desulfuration in furnace2Concentration is 480mg/Nm3, flue-gas temperature is 138 DEG C, and exhaust gas volumn is
1750000m3/h.CaO content is 15~23wt% in high-calcium fly ass after desulfuration in furnace.High-calcium fly ass is conveyed into absorption
It is 85 DEG C that absorption tower running temperature is kept in tower, during operation, and absorption tower bed pressure drop is 1.1kPa, high-calcium fly ass consumption
6.5t/h and atomization process water consumption 26t/h, auxiliary absorbent magnitude of recruitment is zero.After treatment, SO is obtained2Concentration is 34mg/Nm3
Neat stress, significant desulfurization effect.
Embodiment 3
The high-calcium fly ass that multi-unit plant is carried out in the system that embodiment 1 is provided is shared and recycling, with certain
One has as a example by the 6 × 100MW grades of private station of Circulating Fluidized Bed Boilers, and chimney entrance content of sulfur dioxide is less demanding
In 35mg/Nm3, situation is embodied as follows：
Every 100MW boiler working condition exhaust gas volumns 810000m3/ h, wet mark exhaust gas volumn 490000m3/ h, does mark exhaust gas volumn
450000m3/ h, SO in former flue gas during non-desulfurization in stove2Concentration is 4000mg/Nm3, flyash in former flue gas during non-desulfurization in stove
Concentration is 20000mg/Nm3。
According to desulfuration in furnace result of the test, when desulfuration in furnace calcium sulfur ratio is 1.0, desulfuration in furnace efficiency is 50%, flyash
Middle CaO content ＜ 3.0%, belongs to Class F fly ash category, can outward sell utilization, SO in flue gas after preposition deduster2Content is
2000mg/Nm3；Desulfuration in furnace calcium sulfur ratio be 2.0 when, desulfuration in furnace efficiency be 75%, CaO content ＞ 10.0% in flyash,
Belong to high-calcium fly ass category, it is impossible to sell utilization outward, SO in flue gas after preposition deduster2Content is 1000mg/Nm3；Desulfuration in furnace
When calcium sulfur ratio is 3.0, desulfuration in furnace efficiency is 90%, CaO content ＞ 20.0% in flyash, belongs to high-calcium fly ass category,
Utilization cannot be outward sold, SO in flue gas after preposition deduster2Content is 400mg/Nm3。
Shared and resource utilization system using the high-calcium fly ass of multi-unit plant of the invention, 6 × 100MW grades of circulation
The wherein 1 desulfuration in furnace efficiency of 100MW unit optimum selections 90% of fluidized-bed combustion boiler unit, what this unit desulfuration in furnace was produced
Flyash is high-calcium fly ass, and the recycle stream of all 6 100MW units is shared and distributed to by high-calcium fly ass distribution system
Change bed dry desulfurization absorbing tower；The desulfuration in furnace efficiency of remaining 5 100MW unit optimum selection 50%, SO in flue gas after desulfuration in furnace2
Concentration is high, high-calcium fly ass flue gas desulfurization scarce capacity, and desulfurization is aided in as auxiliary absorbent using outsourcing calcium hydroxide.This 5
The flyash of the preposition deduster trapping of 100MW units is Class F fly ash, and outer row is delivered to and utilization is sold outside flyash storehouse.
Do not use the high-calcium fly ass of multi-unit plant of the invention shared and resource utilization system, 6 × 100MW grades is followed
Circulation fluidized bed boiler unit can only use traditional desulfurization program, with the side that following three kinds of desulfuration in furnace efficiency are 50%~90%
As a example by case：
1) stove sodalime stone desulfurization 50%, flyash CaO content ＜ 3.0% sells, slaked lime desulfurizing after stove outside flyash；
2) stove sodalime stone desulfurization 75%, flyash CaO content ＞ 10.0%, flyash is stacked, slaked lime desulfurizing after stove；
3) stove sodalime stone desulfurization 90%, flyash CaO content ＞ 20.0%, flyash is stacked, slaked lime desulfurizing after stove；
150 yuan/ton of local lime stone price, 600 yuan/ton of calcium hydroxide price, 30 yuan/ton of flyash price.Every unit
Average annual hours of operation 7000h.
Shared and resource utilization system using the high-calcium fly ass of multi-unit plant of the invention, 6 × 100MW units
Private station consumes 3.8 ten thousand tons of auxiliary absorbent every year, consumes 180,000 tons of lime stone, can outward sell 410,000 tons of flyash, and does not adopt
Compared with three of the above scheme of the invention, whole private station year saves operating cost 440~54,000,000 yuan, economic benefit shows
Write.
The above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications also should
It is considered as protection scope of the present invention.
Claims (10)
1. a kind of high-calcium fly ass of multi-unit plant is shared and resource utilization system, and every unit includes：
CFBB；
The preposition deduster that smoke inlet is connected with the exhanst gas outlet of CFBB；
The circulating fluidized bed dry desulfuration absorbing tower that smoke inlet is connected with the exhanst gas outlet of preposition deduster；
The rearmounted deduster that smoke inlet is connected with the exhanst gas outlet of circulating fluidized bed dry desulfuration absorbing tower；
The air-introduced machine being connected with the exhanst gas outlet of rearmounted deduster with smoke inlet；
All units share a set of high-calcium fly ass distribution system, before the entrance of high-calcium fly ass distribution system and every unit
The ash hole for putting deduster is connected, and high-calcium fly ass distribution system can catch preposition deduster according to the calcium oxide content of flyash
Row in or beyond the flyash feeding circulating fluidized bed dry desulfuration absorbing tower of collection.
2. system according to claim 1, it is characterised in that the high-calcium fly ass distribution system includes high-calcium fly ass
Distribution terminal and multiple high-calcium fly ass storehouses；The ash inlet of high-calcium fly ass distribution terminal and every preposition dedusting of unit
The ash hole of device is connected, the ash hole and every ash inlet phase in the high-calcium fly ass storehouse of unit of high-calcium fly ass distribution terminal
Even, every ash hole in the high-calcium fly ass storehouse of unit respectively with the high calcium of the circulating fluidized bed dry desulfuration absorbing tower of the unit
Flyash import is connected；The ash inlet of high-calcium fly ass distribution terminal and every company of the ash hole of the preposition deduster of unit
One-level distribution conveying device and middle storage delivery adjustment device are provided with adapter road；High-calcium fly ass distributes the ash hole of terminal
Secondary distribution conveying device is provided with every connecting line of the ash inlet in the high-calcium fly ass storehouse of unit.
3. system according to claim 1, it is characterised in that the high-calcium fly ass distribution system also includes flyash
Storehouse, the ash inlet in flyash storehouse is connected with the ash hole of every preposition deduster of unit；The ash inlet in flyash storehouse with every
One-level distribution conveying device and outer row's delivery adjustment device are provided with the connecting line of the ash hole of the preposition deduster of unit.
4. system according to claim 1, it is characterised in that also including auxiliary absorbent feeding mechanism, auxiliary absorbent
The discharging opening of feeding mechanism is connected with the auxiliary absorbent import of circulating fluidized bed dry desulfuration absorbing tower.
5. system according to claim 1, it is characterised in that also including desulfurizing byproduct circulation and outer arranging device；Desulfurization
Accessory substance is circulated and the ash inlet of outer arranging device is connected with the ash hole of rearmounted deduster, and desulfurizing byproduct is circulated and outer arranging device
The desulfurizing byproduct that rearmounted deduster is trapped can be looped back as needed and arranged in or beyond circulating fluidized bed dry desulfuration absorbing tower.
6. high-calcium fly ass distribution system according to claim 2, it is characterised in that the ash discharge in the high-calcium fly ass storehouse
Mouth is connected with the high-calcium fly ass import of circulating fluidized bed dry desulfurizing tower；The ash hole and recirculating fluidized bed in high-calcium fly ass storehouse
Be additionally provided with the connecting line of the high-calcium fly ass import of dry desulfurizing tower high-calcium fly ass metering device, high-calcium fly ass to
Material adjusting means and high-calcium fly ass are to material conveying device.
7. a kind of high-calcium fly ass that multi-unit plant is carried out in system described in any one of claim 1~6 is shared and resource
The method that change is utilized, comprises the following steps：
A), the desulfuration in furnace flue gases that the desulphurization in circulating fluidized bed boiler of many generating sets is produced through preposition deduster at
Reason, obtains flyash and preceding dedusting flue gas；
B), flyash passes through high-calcium fly ass distribution system according to calcium oxide content and the flue gas desulfurization demand of Duo Tai generating sets
Row in or beyond many circulating fluidized bed dry desulfuration absorbing towers of generating set of feeding；
C), preceding dedusting flue gas is taken off as desulfurization absorbent using high-calcium fly ass in circulating fluidized bed dry desulfuration absorbing tower
Sulphur, obtains the flue gas containing desulfurizing byproduct；
D), the flue gas containing desulfurizing byproduct is processed through rearmounted deduster, obtains desulfurizing byproduct and rear dedusting flue gas.
8. method according to claim 7, it is characterised in that described in feeding circulating fluidized bed dry desulfuration absorbing tower
The calcium oxide content of high-calcium fly ass is in more than 10wt%.
9. method according to claim 7, it is characterised in that SO in the desulfuration in furnace flue gas2Concentration is higher than 500mg/
Nm3When, auxiliary absorbent is sent into circulating fluidized bed dry desulfuration absorbing tower carries out auxiliary desulfurization.
10. method according to claim 7, it is characterised in that in step c), the calcium sulfur ratio of the desulfurization is not higher than 3.0.
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