CN207928975U - A kind of alkali recovery boiler flue gas denitrification system - Google Patents
A kind of alkali recovery boiler flue gas denitrification system Download PDFInfo
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- CN207928975U CN207928975U CN201721911847.0U CN201721911847U CN207928975U CN 207928975 U CN207928975 U CN 207928975U CN 201721911847 U CN201721911847 U CN 201721911847U CN 207928975 U CN207928975 U CN 207928975U
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Abstract
A kind of alkali recovery boiler flue gas denitrification system, including low CO systems and the out of stock system of furnace injection, the out of stock system of furnace injection includes reducing agent conveying device and at least one injection apparatus, described injection apparatus one end is connected with reducing agent conveying device, and the other end is connected with reaction zone in the boiler of tertiary-air pipe upper end is located at；The low CO systems include low CO air hoses, and the air inlet of the low CO air hoses accesses low CO wind, and air outlet is connected with injection apparatus.Denitration technology used in effective solution typical coal-fired boiler cannot can guarantee that the NOx in flue gas being capable of qualified discharge the normal use on alkali recovery boiler the problem of.The heat caused by CO that burns in this denitration technology can spray the heat that the water evaporation that reducing agent is brought into absorbs with denitration and offset, furnace temperature is set to keep original operating mode or variation little, the unlikely thermal efficiency for reducing boiler, also unlikely furnace temperature raising cause superheater coking due to sode ash melts.
Description
Technical field
The utility model belongs to the out of stock field of boiler, more particularly, to a kind of alkali recovery boiler flue gas denitrification system.
Background technology
At this stage, domestic papermaking, the equal auxiliary construction of slurrying company have alkali recovery boiler, for recycle the alkali in black liquor and
The alkali of heat, the alkali collection in black liquor is recycled and reused for slurrying, and produced heat is for producing steam.As national environmental protection administers power
The increasing of degree, environmental protection administration require, and the discharge of alkali recovery furnace flue gas pollutant temporarily executes《Fossil-fuel power plant atmospheric pollutant emission standard》
（GB13223-2011）Middle circulating fluidized bed boiler discharge standard.NOx emission index in existing alkali recovery boiler flue gas cannot
Meet related environmental requirement, it is imperative to carry out denitrating system transformation to alkali recovery boiler.
There are following characteristics for alkali recovery boiler flue gas：1. inner flue gas of the stove temperature is high；2. smoke components are complicated, containing a large amount of
Sode ash；3. CO concentration in flue gas is high, up to 3000ppm or higher.Existing coal-burning boiler denitration technology cannot be in alkali recovery boiler
The CO of upper normal use, high concentration makes the denitration efficiency of conventional SNCR gas denitrifying technologies be greatly lowered, cigarette containing sode ash
Gas easily causes SNCR denitration system nozzle slagging blocking, and complicated smoke components cause in the catalyst of SCR gas denitrifying technologies
Poison and inactivation.Therefore, it develops a kind of new denitration technology and can guarantee that the flue gas of alkali recovery boiler after treatment can be normal up to standard
Discharge becomes a kind of urgent demand.
Invention content
System problem to be solved in the utility model is：Overcome the shortcomings of existing system, a kind of alkali recovery boiler cigarette is provided
Gas denitrating system can efficiently solve alkali recovery boiler flue gas NOx and discharge problem not up to standard.
System schema is used by the utility model solves its system problem：A kind of alkali recovery boiler denitrating flue gas system
System, including low CO systems and the out of stock system of furnace injection, the out of stock system of furnace injection include reducing agent conveying device and extremely
A few injection apparatus, described injection apparatus one end are connected with reducing agent conveying device, the other end and positioned at tertiary-air pipe upper end
Boiler in reaction zone be connected；The low CO systems include low CO air hoses, and the air inlet of the low CO air hoses accesses low CO wind,
Its air outlet is connected with injection apparatus.
In the above scheme, in injection apparatus into boiler reaction zone spray reducing agent while, by low CO air hoses to
It is passed through low CO wind in injection apparatus, and reaction zone sprays into boiler by injection apparatus, sprays into the low CO wind of reaction zone, it can be with
The complete CO that do not burn in the flue gas of promotion reaction zone burns away, while the heat for generation of burning can be offset because injection apparatus sprays
The heat that the water evaporation that reducing agent is brought into absorbs is penetrated, to put forward the out of stock effect of reducing agent.
Further, the reducing agent conveying device includes reducing agent supply module, dilution metering module, compressed air supply
Module and distribution module, the reducing agent supply module are connected by diluting metering module with distribution module, the compressed air
Supply module is connected with distribution module, and the distribution module is connected with each injection apparatus.
Specifically, all kinds of reducing agents and diluent are delivered to dilution metering module by reducing agent supply module；Dilution
Metering module is diluted after allotment reducing agent and softening agent and obtains dilution reducing agent, and the liquid after dilution is delivered to distribution
Module；Under the action of the compressed air that compressed air supply module is supplied, distribution module is delivered to reducing agent is diluted respectively
Injection apparatus will be diluted the reaction zone of reducing agent penetrating boiler by injection apparatus.
Further, the reducing agent conveying device further includes control module, the control module and distribution module, reducing agent
Supply module and dilution metering module electrical connection.Controlling the supply of reducing agent supply module by control module, same amount is not various also
Former agent is controlled after dilution metering module carries out the allotments of various dilution ratios and conveys distribution module to diluting metering module, point
The control instruction for receiving control module with module conveys quantitative dilution reducing agent to each injection apparatus.
Further, the distribution module includes the gas being connected respectively with compressed air supply module and reducing agent supply module
Body distributor and liquid distributor, and be both electrically connected with control module.
In the above scheme, control signal is sent out to gas distributor and liquid distributor respectively by control module, is
The two can think that each injection apparatus conveys different amounts of compressed air and dilution reducing agent.
Further, the reducing agent supply module includes reducing agent storage tank and softening agent storage tank, the two be separately installed with
The reducing agent circulator and softening agent circulator of controller module electrical connection, and reducing agent storage tank and softening agent storage tank difference
It is connected with dilution metering module by reducing agent circulator and softening agent circulator.
In the above scheme, the reducing agent storage tank and reducing agent in softening agent storage tank and softening agent pass through cycle respectively
After device pressurization, it is delivered to dilution metering module and carries out allotment dilution；Cycle on reducing agent storage tank and softening agent storage tank simultaneously
Device both can be such that the reducing agent and softening agent stored holding circulates, and prevent deposition denaturation, and pass through control
Device processed control reducing agent circulator and softening agent circulator, both can adjust to dilution metering module conveying reducing agent with
And the amount of softening agent.
Specifically, circulator include be separately positioned on reducing agent storage tank and circulation line on softening agent storage tank, with
And the cycle force (forcing) pump being arranged in cycle, the cycle for realizing reducing agent and softening agent is pumped by cycle extrusion, and can will pressurize
Reducing agent and softening agent afterwards is delivered to dilution metering module.
Further, the injection apparatus includes spray gun, casing and low CO air hoses, and described sleeve one end is spout, and spout
Be connected to reaction zone in boiler, other end side is connected to low CO air hoses, described spray gun one end be equipped with compressed air joint and
Reducing agent connector, other end plug-in-sleeve simultaneously extend to sleeve spout and go out.
In the above scheme, spray gun access reducing agent and compressed air, and after being atomized reducing agent by compressed air
It sprays, meanwhile, casing accesses low CO wind, and low CO wind goes out ejection from casing spout and accesses the boiler reaction zone that comes, and low CO wind is not
It can only promote unburned complete flue gas in stove to burn away, the CO concentration of regional area be reduced, to improve denitration efficiency；Together
When, low CO wind can prevent ash-laden gas in the nozzle and stove of spray gun to be in direct contact, and avoid the nozzle slagging of spray gun.
Preferably, spray gun is double atomizers, can preferably ensure to spurt into reaction zone in boiler by being atomized twice
Reducing agent, have good atomizing effect.
Further, further include low CO wind turbines that CO air hoses low with each injection apparatus are connected, the low CO wind turbines and control
Module is electrically connected.
In the above scheme, control module sends control signal to low CO wind turbines, you can controls low CO wind turbines and is filled to injection
Set the air quantity and wind pressure for conveying low CO wind.
Specifically, the source of low CO wind is tertiary-air pipe or low CO wind turbines, according to the specific reality of alkali recovery boiler
Situation reasonably selects the source of low CO wind.
Further, the low CO air hoses include the low CO air hoses of tertiary air and the low CO air hoses of wind turbine, the low CO wind of the tertiary air
Pipe is connected with tertiary-air pipe, and the low CO air hoses of the wind turbine are connected with low CO wind turbines.
The utility model also provides a kind of method out of stock using above-mentioned out of stock system progress alkali recovery boiler, specific steps
It is as follows：
（1）Low CO systems access low CO wind by low CO air hoses, and convey each injection apparatus, and boiler is sprayed by injection apparatus
Reaction zone；
（2）Reducing agent conveying device is injected reductant into, after being diluted allotment by reducing agent conveying device, is delivered to each
Injection apparatus sprays into boiler reaction zone after being atomized by injection apparatus；
（3）In step（1）And step（2）It can be carried out at the same time, or first carry out step（1）Keeping step（1）Operation
It is carried out at the same time step（2）.
Further, the reducing agent is urea, ammonium hydroxide or liquefied ammonia.
Preferably, using urea as reducing agent, since in the present system, the CO concentration of reaction zone is low, therefore does not need
Expensive and easy in inactivation catalyst, thus investment and operating cost are all relatively low, and alkali metal is not influenced in by cigarette ash, reducing agent
The urea that can be easy to get with safety also overcomes and needs the security risk brought as reducing agent with liquefied ammonia in traditional denitration process and answer
Miscellaneous safe examination and approval procedures.
The beneficial effects of the utility model are as follows：A kind of alkali recovery boiler flue gas denitrification system provided by the utility model
And its out of stock method, denitration technology used in effective solution typical coal-fired boiler cannot on alkali recovery boiler normal use
The problem of, it can guarantee that the NOx in flue gas being capable of qualified discharge.The heat caused by CO that burns in this denitration technology can be sprayed with denitration
It penetrates the heat that the water evaporation that reducing agent brought into absorbs to offset, makes furnace temperature keep original operating mode or variation little, unlikely drop
The thermal efficiency of low boiler, also unlikely furnace temperature raising cause superheater coking due to sode ash melts.
Description of the drawings
A kind of structural schematic diagram of alkali recovery boiler flue gas denitrification system of Fig. 1-embodiment 1；
The structural schematic diagram of injection apparatus in Fig. 2-Fig. 1；
A kind of structural schematic diagram of alkali recovery boiler flue gas denitrification system of Fig. 3-embodiment 2.
In figure：1-softening water storage tank, 2-reducing agent storage tanks, 3-softening water circle devices, 4-reducing agent circulator,
5-dilution metering modules, 6-compressed air reservoirs, 7-distribution modules, 8-control modules, 9-injection apparatus, 10-three times
Air hose, 11-boilers, 12-low CO wind turbines；91-casings, 92-spouts, 93-spray guns, 94-pneumatic fittings, 95-reducing agents
Connector, 96-low CO air hoses.
Specific implementation mode
The utility model is described in further detail with reference to the accompanying drawings and embodiments.
Embodiment 1：
With reference to attached drawing 1 ~ 2：A kind of 11 flue gas denitrification system of alkali recovery boiler, including low CO systems and the out of stock system of furnace injection
System, the out of stock system of furnace injection includes reducing agent conveying device and at least one injection apparatus 9, the injection apparatus 9 one
End is connected with reducing agent conveying device, and the other end is connected with reaction zone in the boiler 11 of 10 upper end of tertiary-air pipe is located at；It is described
Low CO systems include low CO air hoses 96, and the air inlet of the low CO air hoses 96 accesses low CO wind, air outlet and 9 phase of injection apparatus
Even.
In the above scheme, while reaction zone sprays reducing agent into boiler 11 in injection apparatus 9, pass through low CO air hoses
96 are passed through low CO wind into injection apparatus 9, and by injection apparatus 9, into boiler 11, reaction zone sprays, and sprays into the low of reaction zone
CO wind, the complete CO that can promote not burn in the flue gas of reaction zone burn away, at the same the heat for generation of burning can offset because
Injection apparatus 9 sprays the heat that the water evaporation that reducing agent is brought into absorbs, to put forward the out of stock effect of reducing agent.
The reducing agent conveying device include reducing agent supply module, dilution metering module 5, compressed air supply module and
Distribution module 7, the reducing agent supply module are connected by diluting metering module 5 with distribution module 7, the compressed air supply
Module is connected with distribution module 7, and the distribution module 7 is connected with each injection apparatus 9.
Specifically, all kinds of reducing agents and diluent are delivered to dilution metering module 5 by reducing agent supply module；Dilution
Metering module 5 is diluted after allotment reducing agent and softening agent and obtains dilution reducing agent, and the liquid after dilution is delivered to point
With module 7；Under the action of the compressed air that compressed air supply module is supplied, distribution module 7 will dilute reducing agent conveying
To each injection apparatus 9, the reaction zone of reducing agent penetrating boiler 11 will be diluted by injection apparatus 9.
The reducing agent conveying device further includes control module 8, and the control module 8 is supplied with distribution module 7, reducing agent
Module and dilution metering module 5 are electrically connected.Reducing agent supply module, which is controlled, by control module 8 supplies the not various reduction of same amount
Agent controls after dilution metering module 5 carries out the allotments of various dilution ratios to dilution metering module 5 and conveys distribution module 7, point
The control instruction for receiving control module 8 with module 7 conveys quantitative dilution reducing agent to each injection apparatus 9.
The distribution module 7 includes the gas distribution being connected respectively with compressed air supply module and reducing agent supply module
Device and liquid distributor, and be both electrically connected with control module 8.
In the above scheme, control signal is sent out to gas distributor and liquid distributor respectively by control module 8, is
The two can think that each injection apparatus 9 conveys different amounts of compressed air and dilution reducing agent.
The reducing agent supply module includes reducing agent storage tank 2 and softening agent storage tank, and the two is separately installed with and controller
The reducing agent circulator 4 and softening agent circulator of module electrical connection, and reducing agent storage tank 2 and softening agent storage tank pass through respectively
Reducing agent circulator 4 and softening agent circulator are connected with dilution metering module 5.
In the above scheme, the reducing agent storage tank 2 and reducing agent in softening agent storage tank and softening agent are respectively by following
After loop device pressurization, it is delivered to dilution metering module 5 and carries out allotment dilution；Simultaneously on reducing agent storage tank 2 and softening agent storage tank
Circulator both can be such that the reducing agent and softening agent stored holding circulates, and prevent deposition denaturation, and lead to
Controller control reducing agent circulator 4 and softening agent circulator are crossed, the two can be adjusted and gone back to the dilution conveying of metering module 5
The amount of former agent and softening agent.
Specifically, circulator include be separately positioned on reducing agent storage tank 2 and circulation line on softening agent storage tank, with
And the cycle force (forcing) pump being arranged in cycle, the cycle for realizing reducing agent and softening agent is pumped by cycle extrusion, and can will pressurize
Reducing agent and softening agent afterwards is delivered to dilution metering module 5.
The injection apparatus 9 includes spray gun 93, casing 91 and low CO air hoses 96, and described sleeve one end is spout 92, and is sprayed
Mouth 92 is connected to reaction zone in boiler 11, and other end side is connected to low CO air hoses 96, and 93 one end of the spray gun is equipped with compression
Pneumatic fitting 94 and reducing agent connector 95, other end plug-in-sleeve 91 simultaneously extend to sleeve spout 92 and go out.
In the above scheme, spray gun 93 accesses reducing agent and compressed air, and will be atomized reducing agent by compressed air
After spray, meanwhile, casing 91 accesses low CO wind, and low CO wind, which goes out ejection from 91 spout 92 of casing and accesses the boiler 11 that comes, to react
Area, low CO wind can not only promote unburned complete flue gas in stove to burn away, reduce the CO concentration of regional area, to improve
Denitration efficiency；Meanwhile low CO wind can prevent ash-laden gas in the nozzle and stove of spray gun 93 to be in direct contact, and avoid the spray of spray gun 93
Mouth slagging.
Preferably, spray gun 93 is double atomizers, can preferably be ensured to spurt into boiler 11 instead by being atomized twice
The reducing agent in area is answered, there is good atomizing effect.
The utility model also provides a kind of method out of stock using above-mentioned out of stock system progress alkali recovery boiler 11, specific to walk
It is rapid as follows：
（1）Low CO systems access low CO wind by low CO air hoses 96, and convey each injection apparatus 9, are sprayed by injection apparatus 9
11 reaction zone of boiler；
（2）Reducing agent conveying device is injected reductant into, after being diluted allotment by reducing agent conveying device, is delivered to each
Injection apparatus 9 sprays into 11 reaction zone of boiler after being atomized by injection apparatus 9；
（3）In step（1）And step（2）It can be carried out at the same time, or first carry out step（1）Keeping step（1）Operation
It is carried out at the same time step（2）.
In the above scheme, the reducing agent is urea, ammonium hydroxide or liquefied ammonia.Preferably, using urea as reducing agent,
Also overcome the security risk for needing to be brought as reducing agent in traditional denitration process with liquefied ammonia and complicated safe examination and approval procedures.
Embodiment 2：
With reference to attached drawing 3：The present embodiment difference from example 1 is that：
Further include the low CO wind turbines 12 that CO air hoses low with each injection apparatus 9 96 are connected, the low CO wind turbines 12 and control
Module 8 is electrically connected.
In the above scheme, control module 8 sends control signal to low CO wind turbines 12, you can controls low CO wind turbines 12 to spray
Injection device 9 conveys the air quantity and wind pressure of low CO wind.
Specifically, the source of low CO wind is tertiary-air pipe 10 or low CO wind turbines 12, according to the tool of alkali recovery boiler 11
Body actual conditions reasonably select the source of low CO wind.
It should be pointed out that low CO air hoses 96 can be set to the low CO air hoses 96 of tertiary air CO air hoses 96 low with wind turbine,
The low CO air hoses 96 of the tertiary air are connected with tertiary-air pipe 10, and the low CO air hoses of the wind turbine 96 are connected with low CO wind turbines 12, and can
The connected control valve of controller is installed in the two, to control the source of tertiary air and the wind in each source by controller
Amount.
Obviously, the system personnel of this field can carry out the utility model various modification and variations without departing from this practicality
Novel spirit and scope.If in this way, these modifications and variations of the present invention belong to the utility model claims and
Within the scope of its peer system, then the utility model is also intended to include these modifications and variations.
Claims (8)
1. a kind of alkali recovery boiler flue gas denitrification system, it is characterised in that：Including low CO systems and the out of stock system of furnace injection, institute
It includes reducing agent conveying device and at least one injection apparatus to state the out of stock system of furnace injection, described injection apparatus one end and reduction
Agent conveying device is connected, and the other end is connected with reaction zone in the boiler of tertiary-air pipe upper end is located at；The low CO systems include
The air inlet of low CO air hoses, the low CO air hoses accesses low CO wind, and air outlet is connected with injection apparatus.
2. alkali recovery boiler flue gas denitrification system according to claim 1, it is characterised in that：The reducing agent conveying device
Including reducing agent supply module, dilution metering module, compressed air supply module and distribution module, the reducing agent supply module
It is connected with distribution module by diluting metering module, the compressed air supply module is connected with distribution module, the distribution mould
Block is connected with each injection apparatus.
3. alkali recovery boiler flue gas denitrification system according to claim 2, it is characterised in that：The reducing agent conveying device
Further include control module, the control module is electrically connected with distribution module, reducing agent supply module and dilution metering module.
4. alkali recovery boiler flue gas denitrification system according to claim 2, it is characterised in that：The distribution module includes point
The gas distributor and liquid distributor not being connected with compressed air supply module and reducing agent supply module, and both with control
Molding block is electrically connected.
5. alkali recovery boiler flue gas denitrification system according to claim 3 or 4, it is characterised in that：The reducing agent supply
Module includes reducing agent storage tank and softening agent storage tank, and the two is separately installed with the reducing agent cycle dress being electrically connected with controller module
Set with softening agent circulator, and reducing agent storage tank and softening agent storage tank respectively pass through reducing agent circulator and softening agent cycle
Device is connected with dilution metering module.
6. the alkali recovery boiler flue gas denitrification system according to claim 1 ~ 4 any one, it is characterised in that：The injection
Device includes spray gun, casing and low CO air hoses, and described sleeve pipe one end is spout, and spout is connected to reaction zone in boiler, another
One end side is connected to low CO air hoses, and described spray gun one end is equipped with compressed air joint and reducing agent connector, and the other end is inserted into set
It manages and extends to casing spout.
7. alkali recovery boiler flue gas denitrification system according to claim 6, it is characterised in that：Further include and each injection apparatus
The connected low CO wind turbines of low CO air hoses, the low CO wind turbines are electrically connected with control module.
8. alkali recovery boiler flue gas denitrification system according to claim 7, it is characterised in that：The low CO air hoses include three
The low CO air hoses of secondary wind and the low CO air hoses of wind turbine, the low CO air hoses of the tertiary air are connected with tertiary-air pipe, the low CO air hoses of the wind turbine
It is connected with low CO wind turbines.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201721911847.0U CN207928975U (en) | 2017-12-30 | 2017-12-30 | A kind of alkali recovery boiler flue gas denitrification system |
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| CN201721911847.0U CN207928975U (en) | 2017-12-30 | 2017-12-30 | A kind of alkali recovery boiler flue gas denitrification system |
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| CN207928975U true CN207928975U (en) | 2018-10-02 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107930358A (en) * | 2017-12-30 | 2018-04-20 | 湖南安普诺环保科技有限公司 | A kind of alkali recovery boiler flue gas denitrification system and its out of stock method |
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2017
- 2017-12-30 CN CN201721911847.0U patent/CN207928975U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107930358A (en) * | 2017-12-30 | 2018-04-20 | 湖南安普诺环保科技有限公司 | A kind of alkali recovery boiler flue gas denitrification system and its out of stock method |
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