CN108310960A - A kind of method of desulphurization in circulating fluidized bed boiler - Google Patents
A kind of method of desulphurization in circulating fluidized bed boiler Download PDFInfo
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- CN108310960A CN108310960A CN201810182343.2A CN201810182343A CN108310960A CN 108310960 A CN108310960 A CN 108310960A CN 201810182343 A CN201810182343 A CN 201810182343A CN 108310960 A CN108310960 A CN 108310960A
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- Prior art keywords
- desulphurization
- fluidized bed
- carbide slag
- circulating fluidized
- bed boiler
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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
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/003—Arrangements of devices for treating smoke or fumes for supplying chemicals to fumes, e.g. using injection devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J2215/00—Preventing emissions
- F23J2215/20—Sulfur; Compounds thereof
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Environmental & Geological Engineering (AREA)
- Analytical Chemistry (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Fluidized-Bed Combustion And Resonant Combustion (AREA)
Abstract
The invention discloses a kind of methods of desulphurization in circulating fluidized bed boiler, include the following steps：S1. quick lime is mixed with water, forms viscous paste；S2. viscous paste obtained is mixed with carbide slag, rice hull carbon, is stirred evenly, vacuum filter dehydration obtains solid desulfurating agent, and the moisture for controlling solid desulfurating agent is 5 ~ 10wt%；S3. solid desulfurating agent is pressurizeed by desulfurizing agent nozzle and is sprayed into the burner hearth of emulsion zone.Desulfuration efficiency can be improved through the invention, reduce production cost.
Description
Technical field
The present invention relates to coal-fired plant boiler equipment technical fields, and in particular to a kind of desulphurization in circulating fluidized bed boiler
Method.
Background technology
70% or more electricity of China comes from thermal power plant, wherein coal electricity accounting 92%, pneumoelectric accounting 4%.Coal-burning power plant is with coal
As the energy, it converts the chemical energy of coal to mechanical energy, then electric energy is converted mechanical energy by turbine generators.
In recent years, as the climate change problem that greenhouse gas emission is brought becomes global topic, the work of emerging economy
Industry process is opened and is accelerated, and global resource provision and environment carrying pressure become increasingly conspicuous, in the energy demand overall growth
Meanwhile the world starts to make the transition to low-carbon future, energy resource structure is changing, and the speedup of the low-carbon fuel of high-efficiency cleaning will surpass
Cross carbon intensity fuel.In particular with《It reaches an agreement in Paris》Coal is given a warning, the Coal Clean of various countries efficiently utilizes
It is extremely urgent.
Due to containing S elements in fire coal, sulfur dioxide is will produce after combustion, at present the method for country's desulfurization, according to sulphur
The form of compound absorbent and byproduct, is divided into three kinds of dry method, semidry method and wet method, and dry desulfurizing process mainly utilizes solid
Absorbent removes the SO in flue gas2, generally limestone fines are sprayed into burner hearth, it is made to be thermally decomposed into CaO, absorb cigarette
SO in gas2, the great advantage of dry desulfurization is no waste water, spent acid discharge, reduces secondary pollution, the disadvantage is that desulfuration efficiency is low,
Cost is higher.
Invention content
The present invention provides a kind of methods of desulphurization in circulating fluidized bed boiler, and desulfuration efficiency can be improved, and reduce production
Cost.
To achieve the above object, the technical scheme is that：
A kind of method of desulphurization in circulating fluidized bed boiler, includes the following steps：
S1. by quick lime and water according to weight ratio 1:0.7 ~ 0.9 mixing, stirs and fully reacts, and forms viscous paste；
S2. viscous paste obtained being mixed with carbide slag, rice hull carbon, the weight ratio of quick lime, carbide slag and rice hull carbon is 1 ~
5:1~3:0.05 ~ 0.2, it stirs evenly, vacuum filter dehydration obtains solid desulfurating agent, controls the moisture of solid desulfurating agent
For 5 ~ 10wt%；
S3. solid desulfurating agent is pressurizeed by desulfurizing agent nozzle and is sprayed into the burner hearth of emulsion zone.
Preferably, further include step S4：S4. after spraying into 30 ~ 40s of solid desulfurating agent, by vapor nozzle to close phase
The vapor of solid desulfurating agent weight 1 ~ 5% is sprayed into the burner hearth in area.
Preferably, the desulfurizing agent nozzle is internally provided with filter screen, and the pore diameter of filter screen is less than 1.5mm.
Preferably, in the step S2, the weight ratio of quick lime, carbide slag and rice hull carbon is 3:2:0.08.
Preferably, the vapor nozzle is uniformly arranged in the radial direction with 4 groups along burner hearth, and is located in furnace height direction and takes off
The lower section of sulphur agent nozzle.
Preferably, the vapor nozzle includes venturi pipe portion and head body portion, venturi pipe portion one end with
Vapor conveyance conduit is connected, and the other end is connected with head body portion, and the head body portion includes the outer round platform of coaxial arrangement
Type mechanism and inner conical mechanism, outer circular platform type mechanism are connected with venturi pipe portion, outer circular platform type mechanism and inner conical mechanism
Several equally distributed fumaroles are equipped in the interlayer surrounded.
Preferably, in the step S2, it is 240 ~ 300 mesh powders that carbide slag is ground into granularity in advance.
The method of above-described desulphurization in circulating fluidized bed boiler, by be added carbide slag can reduce desulfurizing agent at
This, but since carbide slag proportion is larger, is not easy to form eddy flow with fuel and circulating ash in emulsion zone, causes it to be easy to happen heavy
Phenomena such as drop, and then cause desulfuration efficiency low, and the present invention is also added into rice hull carbon, to improve carbide slag and lime mixture
Proportion, and rice hull carbon also has certain suction-operated to carbide slag and lime, and then enables carbide slag with lime with rice
Shell charcoal forms the SO in eddy flow, with boiler in emulsion zone together2It comes into full contact with, achievees the purpose that greatly improve desulfuration efficiency.
Through the invention, SO in capable of making into the flue gas of cyclone separator2Concentration is reduced to 80 ~ 15mg/m3, while can drop
The cost of low desulfurization realizes that the recycling of carbide slag the like waste, environmental protection and energy saving have preferable popularizing application prospect.
Description of the drawings
Fig. 1 is the structural schematic diagram of the present invention.
Fig. 2 is the structural schematic diagram of vapor nozzle.
Fig. 3 is the right side structural representation of Fig. 2.
Fig. 4 is the schematic cross-sectional view in head body portion.
In figure, viscous paste mixing pit 1, carbide slag and rice hull carbon storeroom 2, solid desulfurating agent mixing chamber 3, vacuum filter
Device 4, solid desulfurating agent retain storehouse 5, desulfurizing agent nozzle 6, vapor nozzle 7, venturi pipe portion 71, head body portion 72, jet
Hole 73.
Specific implementation mode
Below in conjunction with specific embodiment, the invention will be further described, but protection scope of the present invention be not limited to it is following
Embodiment.
Embodiment 1
A kind of method of desulphurization in circulating fluidized bed boiler, includes the following steps：
S1. by quick lime and water according to weight ratio 1:0.8 mixes in viscous paste mixing pit 1, stirs and fully reacts, and is formed
Viscous paste.
S2. it is 240 ~ 300 mesh powders that carbide slag is ground into granularity in advance, will be in carbide slag and rice hull carbon storeroom 2
Carbide slag and rice hull carbon import in solid desulfurating agent mixing chamber 3, and viscous paste obtained is also introduced into solid desulfurating agent mixing chamber 3
In, viscous paste is mixed with carbide slag, rice hull carbon, and the weight ratio of quick lime, carbide slag and rice hull carbon is 3:2:0.08, stirring is equal
It is even, so that rice hull carbon is formed certain absorption to lime and carbide slag, then passes through vacuum filter 4 and be dehydrated, obtain solid desulfurating agent,
The moisture for controlling solid desulfurating agent is 5 ~ 10wt%, and certain moisture is kept to be conducive to keep rice hull carbon to quick lime
With the suction-operated of carbide slag；To ensure that the effect of desulfurization, desulfurizing agent nozzle are internally provided with filter screen, the hole of filter screen
Diameter is less than 1.5mm.
S3. solid desulfurating agent is pressurizeed by desulfurizing agent nozzle and is sprayed into the burner hearth of emulsion zone.
In above-mentioned steps, since solid desulfurating agent adds carbide slag, the cost of desulfurizing agent can be reduced, is in addition also added into
Rice hull carbon can improve the proportion of carbide slag and lime mixture, and rice hull carbon also has certain suction to carbide slag and lime
Attached effect, and then carbide slag is enable to form the SO in eddy flow, with boiler in emulsion zone with together with rice hull carbon with lime2Fully connect
It touches, achievees the purpose that greatly improve desulfuration efficiency.
Through this embodiment, SO in capable of making into the flue gas of cyclone separator2Concentration is reduced to 80 ~ 60mg/m3。
Embodiment 2
A kind of method of desulphurization in circulating fluidized bed boiler, includes the following steps：
S1. by quick lime and water according to weight ratio 1:0.8 mixes in viscous paste mixing pit 1, stirs and fully reacts, and is formed
Viscous paste.
S2. it is 240 ~ 300 mesh powders that carbide slag is ground into granularity in advance, will be in carbide slag and rice hull carbon storeroom 2
Carbide slag and rice hull carbon import in solid desulfurating agent mixing chamber 3, and viscous paste obtained is also introduced into solid desulfurating agent mixing chamber 3
In, viscous paste is mixed with carbide slag, rice hull carbon, and the weight ratio of quick lime, carbide slag and rice hull carbon is 3:2:0.08, stirring is equal
It is even, so that rice hull carbon is formed certain absorption to lime and carbide slag, then passes through vacuum filter 4 and be dehydrated, obtain solid desulfurating agent,
The moisture for controlling solid desulfurating agent is 5 ~ 10wt%, and certain moisture is kept to be conducive to keep rice hull carbon to quick lime
With the suction-operated of carbide slag；To ensure that the effect of desulfurization, desulfurizing agent nozzle are internally provided with filter screen, the hole of filter screen
Diameter is less than 1.5mm.
S3. solid desulfurating agent is pressurizeed by desulfurizing agent nozzle and is sprayed into the burner hearth of emulsion zone.
S4. after spraying into 30 ~ 40s of solid desulfurating agent, solid is sprayed into the burner hearth of emulsion zone by vapor nozzle and is taken off
The vapor of sulphur agent weight 1 ~ 5% can improve the water content in boiler, accelerate SO by the way that vapor is added2The dissolving of molecule is expanded
Big SO2Range of scatter, increase SO2With the probability of desulfurization agent, the utilization rate of lime is improved, desulfurization is further increased
Efficiency.
To enable vapor preferably and SO2Contact, vapor nozzle 7 are uniformly arranged in the radial direction with 4 groups along burner hearth, and in stove
Thorax short transverse is located at the lower section of desulfurizing agent nozzle 6.Vapor nozzle 7 includes venturi pipe portion 71 and head body portion 72, text
71 one end of venturi portion is connected with vapor conveyance conduit, and the other end is connected with head body portion 72, and head body portion 72 includes
The outer circular platform type mechanism and inner conical mechanism, outer circular platform type mechanism of coaxial arrangement are connected with venturi pipe portion 71, outer circular platform type
Several equally distributed fumaroles 73 are equipped in the interlayer that mechanism is surrounded with inner conical mechanism, pass through venturi pipe portion 71
Can compress vapor, compressed vapor due to pressure difference effect evenly, farther be sprayed onto in burner hearth.
In above-mentioned steps, since solid desulfurating agent adds carbide slag, the cost of desulfurizing agent can be reduced, is in addition also added into
Rice hull carbon can improve the proportion of carbide slag and lime mixture, and rice hull carbon also has certain suction to carbide slag and lime
Attached effect, and then carbide slag is enable to form the SO in eddy flow, with boiler in emulsion zone with together with rice hull carbon with lime2Fully connect
It touches, achievees the purpose that greatly improve desulfuration efficiency.
Through this embodiment, SO in capable of making into the flue gas of cyclone separator2Concentration is reduced to 40 ~ 15mg/m3。
Embodiment 3
Embodiment 2
A kind of method of desulphurization in circulating fluidized bed boiler, includes the following steps：
S1. by quick lime and water according to weight ratio 1:0.8 mixes in viscous paste mixing pit 1, stirs and fully reacts, and is formed
Viscous paste.
S2. it is 240 ~ 300 mesh powders that carbide slag is ground into granularity in advance, will be in carbide slag and rice hull carbon storeroom 2
Carbide slag and rice hull carbon import in solid desulfurating agent mixing chamber 3, and viscous paste obtained is also introduced into solid desulfurating agent mixing chamber 3
In, viscous paste is mixed with carbide slag, rice hull carbon, and the weight ratio of quick lime, carbide slag and rice hull carbon is 1:1:0.05, stirring is equal
It is even, so that rice hull carbon is formed certain absorption to lime and carbide slag, then passes through vacuum filter 4 and be dehydrated, obtain solid desulfurating agent,
The moisture for controlling solid desulfurating agent is 5 ~ 10wt%, and certain moisture is kept to be conducive to keep rice hull carbon to quick lime
With the suction-operated of carbide slag；To ensure that the effect of desulfurization, desulfurizing agent nozzle are internally provided with filter screen, the hole of filter screen
Diameter is less than 1.5mm.
S3. solid desulfurating agent is pressurizeed by desulfurizing agent nozzle and is sprayed into the burner hearth of emulsion zone.
S4. after spraying into 30 ~ 40s of solid desulfurating agent, solid is sprayed into the burner hearth of emulsion zone by vapor nozzle and is taken off
The vapor of sulphur agent weight 1 ~ 5% can improve the water content in boiler, accelerate SO by the way that vapor is added2The dissolving of molecule is expanded
Big SO2Range of scatter, increase SO2With the probability of desulfurization agent, the utilization rate of lime is improved, desulfurization is further increased
Efficiency.
To enable vapor preferably and SO2Contact, vapor nozzle 7 are uniformly arranged in the radial direction with 4 groups along burner hearth, and in stove
Thorax short transverse is located at the lower section of desulfurizing agent nozzle 6.Vapor nozzle 7 includes venturi pipe portion 71 and head body portion 72, text
71 one end of venturi portion is connected with vapor conveyance conduit, and the other end is connected with head body portion 72, and head body portion 72 includes
The outer circular platform type mechanism and inner conical mechanism, outer circular platform type mechanism of coaxial arrangement are connected with venturi pipe portion 71, outer circular platform type
Several equally distributed fumaroles 73 are equipped in the interlayer that mechanism is surrounded with inner conical mechanism, pass through venturi pipe portion 71
Can compress vapor, compressed vapor due to pressure difference effect evenly, farther be sprayed onto in burner hearth.
In above-mentioned steps, since solid desulfurating agent adds carbide slag, the cost of desulfurizing agent can be reduced, is in addition also added into
Rice hull carbon can improve the proportion of carbide slag and lime mixture, and rice hull carbon also has certain suction to carbide slag and lime
Attached effect, and then carbide slag is enable to form the SO in eddy flow, with boiler in emulsion zone with together with rice hull carbon with lime2Fully connect
It touches, achievees the purpose that greatly improve desulfuration efficiency.
Through this embodiment, SO in capable of making into the flue gas of cyclone separator2Concentration is reduced to 80 ~ 50mg/m3。
Claims (7)
1. a kind of method of desulphurization in circulating fluidized bed boiler, it is characterised in that include the following steps：
S1. by quick lime and water according to weight ratio 1:0.7 ~ 0.9 mixing, stirs and fully reacts, and forms viscous paste；
S2. viscous paste obtained being mixed with carbide slag, rice hull carbon, the weight ratio of quick lime, carbide slag and rice hull carbon is 1 ~
5:1~3:0.05 ~ 0.2, it stirs evenly, vacuum filter dehydration obtains solid desulfurating agent, controls the moisture of solid desulfurating agent
For 5 ~ 10wt%；
S3. solid desulfurating agent is pressurizeed by desulfurizing agent nozzle and is sprayed into the burner hearth of emulsion zone.
2. the method for desulphurization in circulating fluidized bed boiler according to claim 1, it is characterised in that：
Further include step S4：S4. it after spraying into 30 ~ 40s of solid desulfurating agent, is sprayed into the burner hearth of emulsion zone by vapor nozzle
Enter the vapor of solid desulfurating agent weight 1 ~ 5%.
3. the method for desulphurization in circulating fluidized bed boiler according to claim 1, it is characterised in that：
The desulfurizing agent nozzle is internally provided with filter screen, and the pore diameter of filter screen is less than 1.5mm.
4. the method for desulphurization in circulating fluidized bed boiler according to claim 1, it is characterised in that：
In the step S2, the weight ratio of quick lime, carbide slag and rice hull carbon is 3:2:0.08.
5. the method for desulphurization in circulating fluidized bed boiler according to claim 2, it is characterised in that：
The vapor nozzle is uniformly arranged in the radial direction with 4 groups along burner hearth, and in the case where furnace height direction is located at desulfurizing agent nozzle
Side.
6. the method for desulphurization in circulating fluidized bed boiler according to claim 5, it is characterised in that：
The vapor nozzle includes venturi pipe portion and head body portion, venturi pipe portion one end and vapor delivery pipe
Road is connected, and the other end is connected with head body portion, and the head body portion includes the outer circular platform type mechanism and inner circle of coaxial arrangement
Cone mechanism, outer circular platform type mechanism are connected with venturi pipe portion, in the interlayer that outer circular platform type mechanism is surrounded with inner conical mechanism
It is equipped with several equally distributed fumaroles.
7. the method for desulphurization in circulating fluidized bed boiler according to claim 5, it is characterised in that：
In the step S2, it is 240 ~ 300 mesh powders that carbide slag is ground into granularity in advance.
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| CN201810182343.2A CN108310960A (en) | 2018-03-06 | 2018-03-06 | A kind of method of desulphurization in circulating fluidized bed boiler |
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| CN201810182343.2A CN108310960A (en) | 2018-03-06 | 2018-03-06 | A kind of method of desulphurization in circulating fluidized bed boiler |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109126412A (en) * | 2018-08-20 | 2019-01-04 | 中国华能集团清洁能源技术研究院有限公司 | Strengthen the method for solid waste mineralization of carbon dioxide using brine waste |
| CN113058416A (en) * | 2021-03-18 | 2021-07-02 | 大唐环境产业集团股份有限公司 | Spraying device suitable for flue gas desulfurization of carbide slag and application thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109126412A (en) * | 2018-08-20 | 2019-01-04 | 中国华能集团清洁能源技术研究院有限公司 | Strengthen the method for solid waste mineralization of carbon dioxide using brine waste |
| CN109126412B (en) * | 2018-08-20 | 2022-01-14 | 中国华能集团清洁能源技术研究院有限公司 | Method for intensifying mineralization of carbon dioxide by using salt-containing wastewater |
| CN113058416A (en) * | 2021-03-18 | 2021-07-02 | 大唐环境产业集团股份有限公司 | Spraying device suitable for flue gas desulfurization of carbide slag and application thereof |
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