CN108916867A - A kind of ciculation fluidized burning boiler low nitrogen burning technique - Google Patents
A kind of ciculation fluidized burning boiler low nitrogen burning technique Download PDFInfo
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- CN108916867A CN108916867A CN201811036424.8A CN201811036424A CN108916867A CN 108916867 A CN108916867 A CN 108916867A CN 201811036424 A CN201811036424 A CN 201811036424A CN 108916867 A CN108916867 A CN 108916867A
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- Prior art keywords
- burner hearth
- burning
- combustion
- ciculation fluidized
- low nitrogen
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C10/00—Fluidised bed combustion apparatus
- F23C10/18—Details; Accessories
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C10/00—Fluidised bed combustion apparatus
- F23C10/18—Details; Accessories
- F23C10/24—Devices for removal of material from the bed
-
- 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
Abstract
The present invention relates to a kind of ciculation fluidized burning boiler low nitrogen burning techniques, water-coal-slurry is sent into the burner hearth of ciculation fluidized burning boiler as fuel, and fractional combustion is carried out to fuel, First air is sent by the bottom of the burner hearth, Secondary Air is sent by the side wall of the burner hearth, solid gas separation is carried out to the flue gas before the high-temperature flue gas in the burner hearth enters flue, and sends isolated solid particulate matter back in burner hearth circulating combustion.The present invention is comprehensive by the way of cool water mixture burning, fractional combustion and solid particulate matter circulating combustion, can not only improve boiler combustion efficiency, additionally it is possible to reduce nitrogen oxides caused by combustion process itself.
Description
Technical field
The present invention relates to technical field of boiler combustion, in particular to a kind of ciculation fluidized burning boiler low nitrogen burning technique.
Background technique
It is well known that boiler combustion nitrogen oxides generated has very big harm, it is to form acid rain and photochemistry
The main component of smog, and nitrogen oxides can also destroy ozone layer, and then ultraviolet light is caused excessively to cause to hurt to human body
Evil.
Therefore country has carried out stringent limitation for the discharge of nitrogen oxides, thereby produces and a variety of removes denitrification
Methods and techniques, most common selective catalytic reduction (the Selective Catalytic Reduction after being exactly furnace
SCR) denitration method, the technology denitration efficiency is higher, but its equipment cost and operating cost are also very high；Another common side
Formula is to realize that furnace interior divides denitrogenation and selective non-catalytic reduction (Selective Non- using low temperature in furnace and fractional combustion
Catalytic Reduction SNCR) method that combines of denitration, but be directly to burn to coal particle in this kind of method,
The shortcomings that this kind of method, is that in-furnace temperature is low, thus causes the efficiency of combustion of boiler lower, and the SNCR of exhanst gas outlet is set
It is standby also to still need to high cost.
Summary of the invention
The purpose of the present invention is to disclose a kind of ciculation fluidized burning boiler low nitrogen burning technique, so as to guaranteeing pot
While furnace efficiency of combustion, additionally it is possible to reduce nitrogen oxides caused by combustion process itself, while can will generate
Part nitrogen oxides is eliminated by the chemical reaction of itself in burner hearth, and the initial ejection value of nitrogen oxides is finally made to can reach state
The discharge standard of family, to save the equipment cost and operating cost of denitration device after furnace.
In order to achieve the above objectives, ciculation fluidized burning boiler low nitrogen burning technique provided by the invention is：To ciculation fluidized
Water-coal-slurry is sent into the burner hearth of burning boiler as fuel, and to fuel progress fractional combustion, First air by the burner hearth bottom
Portion is sent into, and Secondary Air is sent by the side wall of the burner hearth, to the cigarette before the high-temperature flue gas in the burner hearth enters flue
Gas carries out solid gas separation, and sends isolated solid particulate matter back in burner hearth circulating combustion.
Preferably, ash content accounts for 8%~15% in the water-coal-slurry.
Preferably, ash content accounts for 12% in the water-coal-slurry.
Preferably, the bed storage in the burner hearth is with a thickness of 200mm~300mm, and the flow velocity of flue gas is not low in the burner hearth
In 4.5m/s.
Preferably, the flue gas flow rate in the burner hearth is 4.5m/s~5m/s.
Preferably, the flow state in the burner hearth is full burner hearth fast bed.
Preferably, the high-temperature flue gas carries out solid gas separation by separator, and the solid particle of the separator captures
Rate is not less than 95%.
Preferably, the fuel is anoxycausis in primary combustion, is oxygen-excess combustion when second-time burning.
Preferably, coal accounts for 55%~65% in the water-coal-slurry, weight percent shared by moisture
Than being 34%~44%.
Preferably, the temperature in the burner hearth is 830 DEG C~890 DEG C.
Compared to directly for the mode that coal solid particle burns, water-coal-slurry has combustion even and furnace at present
The lower advantage of thorax flame kernel temperature, and flame kernel temperature reduces the generation that can reduce nitrogen oxides；And in high temperature cigarette
Gas has also carried out solid gas separation before entering flue, and isolated solid particulate matter is sent back to circulating combustion in burner hearth, this
Increase fuel recycle multiplying power, fuel economy improves, so that the volumetric concentration of fixed carbon increases in fuel
Greatly, this can make the nitric oxide generated and carbon reacts and generates nitrogen and carbon monoxide, to make to give birth in burner hearth
At nitrogen oxides further decrease, in addition to this, in ciculation fluidized burning boiler low nitrogen burning technique disclosed in this case, also
By the way of fractional combustion, the mode of fractional combustion not only reduces the significant effect of nitrogen oxides, but also fuel is through excessive
After grade burning, the effect of completely burned can achieve, to effectively promote the efficiency of combustion of fuel.
It can be seen that disclosed in this invention ciculation fluidized burning boiler low nitrogen burning technique, it is comprehensive to use water coal
The mode for starching burning, fractional combustion and solid particulate matter circulating combustion, so that nitrogen oxides caused by furnace chamber inner combustion is big
Amplitude reduction enters in the flue gas in flue from burner hearth, and the concentration of nitrogen oxides has just had reached wanting for national emission standard
It asks, without carrying out denitration process, this just eliminates denitration device after furnace, greatly reduces equipment cost and ciculation fluidized burning pot
The operating cost of furnace；Simultaneously as the mode of fractional combustion and solid particulate matter circulating combustion can effectively improve the combustion of fuel
Burn efficiency, when this just compensates for cool water mixture burning due to flame kernel temperature is lower the lower problem of bring efficiency of combustion, it is whole
Combustion process sheet can be effectively reduced while improving boiler combustion efficiency in a ciculation fluidized burning boiler low nitrogen burning technique
Nitrogen oxides caused by body.
Detailed description of the invention
Fig. 1 is the principle signal of the ciculation fluidized burning boiler low nitrogen burning technique disclosed in an embodiment of the present invention
Figure；
Fig. 2 is the process signal of the ciculation fluidized burning boiler low nitrogen burning technique disclosed in an embodiment of the present invention
Figure.
Specific embodiment
Core of the invention is to provide a kind of ciculation fluidized burning boiler low nitrogen burning technique, so as to guaranteeing pot
While furnace efficiency of combustion, additionally it is possible to reduce nitrogen oxides caused by combustion process itself, while can will generate
Part nitrogen oxides is eliminated by the chemical reaction of itself in burner hearth, and the initial ejection value of nitrogen oxides is finally made to reach country
Discharge standard saves the equipment cost and operating cost of denitration device after furnace.
In order to enable those skilled in the art to better understand the solution of the present invention, with reference to the accompanying drawings and detailed description
The present invention is described in further detail.
As shown in Figure 2, ciculation fluidized burning boiler low nitrogen burning technique disclosed in this invention, specially：To circulation
It is sent into water-coal-slurry in the burner hearth of fluidized bed combustion boiler as fuel, fractional combustion is carried out into the fuel in burner hearth, in this implementation
Fuel is specifically divided into two-stage combustion in example, and First air needed for single-stage combustion is sent by the bottom of burner hearth, needed for secondary firing
Secondary Air by burner hearth side wall be sent into, complete secondary firing after burner hearth in high-temperature flue gas enter flue before to flue gas into
Row solid gas separates (solid and gas), and the gas after separating enters flue, and isolated solid particulate matter passes through ash circulation
System sends circulating combustion in burner hearth back to again.
Those skilled in the art are known, water-coal-slurry be 65% or so by weight proportion coal, weight proportion be 34% left side
Right water and 1% or so a kind of additive low pollution as Physical Processing obtained from, can the coal base fluid body of pipeline fire
Material, compared to directly for the mode that coal solid particle burns, can making water-coal-slurry as boiler oil at present
It burns more uniform, and since for traditional coal-fired mode, the moisture in water-coal-slurry increases, furnace flame center
Temperature is lower, and flame kernel temperature reduces the generation that can effectively reduce nitrogen oxides；Ciculation fluidized burning boiler is further
, solid gas separation is also carried out before high-temperature flue gas enters flue, isolated solid particulate matter is sent back in burner hearth
Circulating combustion, this increases fuel recycle multiplying power, and fire box temperature reduces, and fuel economy improves, so that
The volumetric concentration of fixed carbon increases in fuel, this can make the nitric oxide generated and carbon reacts and generates nitrogen and one
Carbonoxide, so that nitrogen oxides generated in burner hearth be made to further decrease；In addition to this, ciculation fluidized combustion disclosed in this case
In burning boiler low nitrogen burning technique, the mode of fractional combustion is additionally used, the mode of fractional combustion not only reduces nitrogen oxides
Significant effect, and fuel passes through after multistage combustion, can achieve the effect of completely burned, to effectively promote the combustion of fuel
Burn efficiency.
Fig. 1 can clearly reflect cool water mixture burning, fractional combustion and solid particulate matter circulating combustion to nitrogen oxides and
The influence of efficiency of combustion, the framework content that the arrow in straight line with the arrow is directed toward represent the effect reached, straight line two sides text generation
The reason of table tells on.Disclosed in this invention ciculation fluidized burning boiler low nitrogen burning technique, it is comprehensive to use water coal
The mode for starching burning, fractional combustion and solid particulate matter circulating combustion, so that nitrogen oxides caused by furnace chamber inner combustion is big
Amplitude reduction enters in the flue gas in flue from burner hearth, and the concentration of nitrogen oxides has just had reached wanting for national emission standard
It asks, without carrying out denitration process, this just eliminates denitration device after furnace, greatly reduces equipment cost and ciculation fluidized burning pot
The operating cost of furnace；Simultaneously as the mode of fractional combustion and solid particulate matter circulating combustion can effectively improve the combustion of fuel
Burn efficiency, when this just compensates for cool water mixture burning due to flame kernel temperature is lower the lower problem of bring efficiency of combustion, it is whole
Combustion process sheet can be effectively reduced while improving boiler combustion efficiency in a ciculation fluidized burning boiler low nitrogen burning technique
Nitrogen oxides caused by body.
In water-coal-slurry employed in the present invention, coal point accounts for 55%~65%, shared by moisture
Weight percent is 34%~44%, the weight percent of the weight percent of coal point and moisture can appropriate adjustment, such as coal
The weight percent divided can be 58%, 60% or 65%, and the weight percent of moisture can be 38%, 40% or 44%；Water
Contain ash content in coal point in coal slurry, in order to further decrease the generation of nitrogen oxides in combustion process, is adopted in the present embodiment
Overall weight percentage shared by ash content is 8%~15% in water-coal-slurry, and ash content proportion amount percentage can carry out
Appropriate adjustment, such as ash content account for the 10% or 13% of water-coal-slurry overall weight, and preferably 12%, compared to GB/
For the ash content of the water-coal-slurry of defined is 8% or so in T18855-2014, the ash in water-coal-slurry employed in the present embodiment
Proportion is divided to improve, the solid particulate matter after solid gas separates increases, and the temperature that this allows for flame kernel is further appropriate
It reduces, thus the significantly more efficient generation for inhibiting nitrogen oxides.
It is undeniable to be, although the increase of ash content inhibits the generation of nitrogen oxides, the drop of flame kernel temperature
Low the problem of efficiency of combustion being brought to reduce, for this purpose, efficient separator is used in the present embodiment when carrying out solid gas separation, it should
The solid particulate matter catch rate of separator is not less than 95%, and the solid particulate matter of the overwhelming majority can be returned to again furnace by this
Circulating combustion is carried out in thorax, it is ensured that fuel combustion is complete, and this aspect can increase the carbon content in burner hearth, promotes in burner hearth
Nitric oxide forms flammable carbon monoxide and stable nitrogen after reacting with carbon, reduce in burner hearth containing for nitrogen oxides in flue gas
Amount；On the other hand the efficiency of combustion of fuel can also be effectively improved.
It preferably, is anoxycausis (oxygen debt burning) when primary combustion, oxygen concentration is not during fuel-staged combustion
Can be effectively to inhibit the generation of nitrogen oxides in burner hearth, and second-time burning is oxygen-excess combustion, and Secondary Air is restored in burner hearth
More than area (downstream) is sent into burner hearth, and the nitrogen in burner hearth has formd stable dinitrogen at this time, it is not easy to oxygen shape
At nitrogen oxides, the generation of nitrogen oxides in burner hearth is further suppressed.
By the discovery that studies for a long period of time, flue gas is longer in the highest region residence time of flame temperature, easier in burner hearth
Nitrogen oxides is generated, for this purpose, the fluidised form inside burner hearth is further had changed in the present embodiment on the basis of the above embodiments, with
Shorten residence time of the flue gas in flame temperature highest zone, specifically, the bed storage thickness in burner hearth is changed to 200mm
~300mm, the flow velocity of flue gas is not less than 4.5m/s in the burner hearth, more preferably, the flow velocity of flue gas be adjusted to 4.5m/s~
5m/s, the fluidised form balance in entire burner hearth re-establish, and are 400mm~500mm, flue gas stream compared to bed storage in current burner hearth
For speed is the scheme of 2.5m/s~3m/s, the flue gas flow rate in low nitrogen burning technique disclosed in the present embodiment is significantly mentioned
It rising, the flow state in burner hearth is in turbulence state, and flue gas is obviously shortened in the residence time of flame temperature highest zone, thus
The concentration of nitrogen oxides reduces；Simultaneously as the flow disturbance in burner hearth enhances, this is it is also possible that fuel more adequately fires
It burns, therefore further improves the efficiency of combustion of fuel.
Certainly, in order to advanced optimize scheme, the flue gas flow rate in burner hearth can also be made to reach 8m/s or more, makes full burner hearth
Interior fluidised form forms fast bed, to further decrease flue gas in the residence time of flame temperature highest zone, reduces nitrogen oxides
Concentration.
To sum up, the present invention effectively reduces nitrogen in burner hearth while improving efficiency of combustion by the combination of many kinds of measures
The production quantity of oxide, while the part nitrogen oxides generated can also be eliminated by way of chemical reaction, it is a variety of
So that the temperature control in burner hearth is in the range of 830 DEG C~890 DEG C, this finally to make initial out of burner hearth for measure combination
Amount of nitrogen oxides in the flue gas of discharge can be met the requirements, and save denitration device and operating cost after furnace.
Ciculation fluidized burning boiler low nitrogen burning technique provided by the present invention is described in detail above.Herein
Apply that a specific example illustrates the principle and implementation of the invention, the explanation of above example is only intended to help
Understand method and its core concept of the invention.It should be pointed out that for those skilled in the art, not taking off
, can be with several improvements and modifications are made to the present invention under the premise of from the principle of the invention, these improvement and modification also fall into this
In invention scope of protection of the claims.
Claims (10)
1. a kind of ciculation fluidized burning boiler low nitrogen burning technique, which is characterized in that into the burner hearth of ciculation fluidized burning boiler
Water-coal-slurry is sent into as fuel, and fractional combustion is carried out to fuel, First air is sent by the bottom of the burner hearth, and Secondary Air is by institute
The side wall for stating burner hearth is sent into, and carries out solid gas separation to the flue gas before the high-temperature flue gas in the burner hearth enters flue, and
Send isolated solid particulate matter back in burner hearth circulating combustion.
2. ciculation fluidized burning boiler low nitrogen burning technique according to claim 1, which is characterized in that in the water-coal-slurry
Ash content accounts for 8%~15%.
3. ciculation fluidized burning boiler low nitrogen burning technique according to claim 2, which is characterized in that in the water-coal-slurry
Ash content accounts for 12%.
4. ciculation fluidized burning boiler low nitrogen burning technique according to claim 1, which is characterized in that in the burner hearth
Bed storage is with a thickness of 200mm~300mm, and the flow velocity of flue gas is not less than 4.5m/s in the burner hearth.
5. ciculation fluidized burning boiler low nitrogen burning technique according to claim 4, which is characterized in that in the burner hearth
Flue gas flow rate is 4.5m/s~5m/s.
6. ciculation fluidized burning boiler low nitrogen burning technique according to claim 4, which is characterized in that in the burner hearth
Flow state is full burner hearth fast bed.
7. ciculation fluidized burning boiler low nitrogen burning technique according to claim 1, which is characterized in that the high-temperature flue gas
Solid gas separation is carried out by separator, and the solid particle catch rate of the separator is not less than 95%.
8. ciculation fluidized burning boiler low nitrogen burning technique according to claim 1, which is characterized in that the fuel is one
It is anoxycausis when secondary burning, is oxygen-excess combustion when second-time burning.
9. ciculation fluidized burning boiler low nitrogen burning technique according to claim 2 or 3, which is characterized in that the water coal
Coal accounts for 55%~65% in slurry, and moisture accounts for 34%~44%.
10. ciculation fluidized burning boiler low nitrogen burning technique according to any one of claims 1 to 8, which is characterized in that
Temperature in the burner hearth is 830 DEG C~890 DEG C.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1459583A (en) * | 2002-05-23 | 2003-12-03 | 姜秀民 | Water coal pulp fluidized suspension high effect cleaning combustion technology |
| CN104197321A (en) * | 2014-07-24 | 2014-12-10 | 杭州福鼎节能科技服务有限公司 | Coal water slurry low-concentration oxygen enrichment fluidization suspension combustion method and boiler device thereof |
| CN204005963U (en) * | 2014-07-24 | 2014-12-10 | 杭州福鼎节能科技服务有限公司 | A kind of water-coal-slurry low concentration oxygen enrichment fluidisation suspension fired boiler device |
| CN105351919A (en) * | 2015-12-11 | 2016-02-24 | 北京热华能源科技有限公司 | Horizontal circulating fluidized bed boiler for burning coal-water slurry |
| CN205227298U (en) * | 2015-12-11 | 2016-05-11 | 北京热华能源科技有限公司 | Use horizontal circulating fluidized bed boiler of coal slurry |
| CN106765067A (en) * | 2016-12-14 | 2017-05-31 | 青岛特利尔环保股份有限公司 | A kind of water-coal-slurry minimum discharge combustion system |
-
2018
- 2018-09-06 CN CN201811036424.8A patent/CN108916867A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1459583A (en) * | 2002-05-23 | 2003-12-03 | 姜秀民 | Water coal pulp fluidized suspension high effect cleaning combustion technology |
| CN104197321A (en) * | 2014-07-24 | 2014-12-10 | 杭州福鼎节能科技服务有限公司 | Coal water slurry low-concentration oxygen enrichment fluidization suspension combustion method and boiler device thereof |
| CN204005963U (en) * | 2014-07-24 | 2014-12-10 | 杭州福鼎节能科技服务有限公司 | A kind of water-coal-slurry low concentration oxygen enrichment fluidisation suspension fired boiler device |
| CN105351919A (en) * | 2015-12-11 | 2016-02-24 | 北京热华能源科技有限公司 | Horizontal circulating fluidized bed boiler for burning coal-water slurry |
| CN205227298U (en) * | 2015-12-11 | 2016-05-11 | 北京热华能源科技有限公司 | Use horizontal circulating fluidized bed boiler of coal slurry |
| CN106765067A (en) * | 2016-12-14 | 2017-05-31 | 青岛特利尔环保股份有限公司 | A kind of water-coal-slurry minimum discharge combustion system |
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Address after: 266073 E402, 403, 67, 69 Yinchuan West Road, Shinan District, Qingdao City, Shandong Province Applicant after: Qingdao Tellier Environmental Protection Group Co., Ltd. Address before: Room 402 and 403, Block E, 67 and 69 Yinchuan West Road, Shinan District, Qingdao City, Shandong Province Applicant before: Qingdao Clear Environmental Protection Boiler Engineering Co., Ltd. |
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Application publication date: 20181130 |