CN111841275A - Ultra-clean discharge method suitable for boiler - Google Patents
Ultra-clean discharge method suitable for boiler Download PDFInfo
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- CN111841275A CN111841275A CN201910950909.6A CN201910950909A CN111841275A CN 111841275 A CN111841275 A CN 111841275A CN 201910950909 A CN201910950909 A CN 201910950909A CN 111841275 A CN111841275 A CN 111841275A
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- boiler
- outlet
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- hearth
- inlet
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- 238000000034 method Methods 0.000 title claims abstract description 23
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 17
- 238000002485 combustion reaction Methods 0.000 claims abstract description 17
- 239000003546 flue gas Substances 0.000 claims abstract description 17
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims abstract description 16
- 235000011114 ammonium hydroxide Nutrition 0.000 claims abstract description 16
- 238000004088 simulation Methods 0.000 claims abstract description 16
- 239000007921 spray Substances 0.000 claims abstract description 15
- 239000000446 fuel Substances 0.000 claims abstract description 12
- 238000005507 spraying Methods 0.000 claims abstract description 8
- 238000007599 discharging Methods 0.000 claims description 7
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 7
- 238000006243 chemical reaction Methods 0.000 description 6
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 2
- 229910021529 ammonia Inorganic materials 0.000 description 2
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- BIGPRXCJEDHCLP-UHFFFAOYSA-N ammonium bisulfate Chemical compound [NH4+].OS([O-])(=O)=O BIGPRXCJEDHCLP-UHFFFAOYSA-N 0.000 description 1
- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 description 1
- 229910052921 ammonium sulfate Inorganic materials 0.000 description 1
- 235000011130 ammonium sulphate Nutrition 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000010835 comparative analysis Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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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
- B01D53/54—Nitrogen compounds
- B01D53/56—Nitrogen oxides
-
- 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
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/20—Reductants
- B01D2251/206—Ammonium compounds
- B01D2251/2062—Ammonia
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Fluidized-Bed Combustion And Resonant Combustion (AREA)
Abstract
The embodiment of the invention discloses an ultra-clean emission method suitable for a boiler, which is used for solving the technical problem that NOx discharged during combustion of the existing boiler cannot be fully treated, so that the atmosphere is polluted. The embodiment of the invention comprises the following steps: building a physical model of a hearth of the boiler by using Gambit software, and carrying out grid division on the physical model of the hearth; importing the physical model subjected to grid division into Fluent software, and setting boundary conditions of an inlet and an outlet of a boiler; setting fuel components of a boiler combustion process by using a prePDF software, introducing the fuel components into the Fluent software, and calculating by the Fluent software to obtain a simulation result; comparing and analyzing the speed field and the turbulence intensity distribution condition of the hearth with the speed field and the turbulence intensity distribution condition of the outlet of the horizontal flue of the boiler according to the simulation result; and respectively adding spray guns for spraying ammonia water on the inner sides of the inlet section of the left cyclone separator and the inlet section of the right cyclone separator which have the fastest flue gas flow speed at the outlet of the horizontal flue of the boiler according to the analysis result.
Description
Technical Field
The invention relates to the technical field of boiler waste gas emission treatment, in particular to an ultra-clean emission method suitable for a boiler.
Background
The circulating fluidized bed boiler adopts SNCR denitration, the original SNCR denitration spray guns are arranged in the inlet section and the downstream area of the separator, 4 spray guns are arranged in the inlet section of each separator, 2 spray guns are arranged in the downstream area, the whole boiler is totally provided with 12 spray guns, and the current average value of the NOx emission hours is 70-90mg/Nm3(hourly mean discharge Standard: < 100mg/Nm3) At present, the NOx is occasionally caused to exceed the standard instantaneously when the adjustment load and the sludge mixed combustion amount are changed.
In order to ensure the standard emission, 20% concentration ammonia water is used as a denitration reducing agent, NOx can be converted into nitrogen and water which are naturally contained in the air by adding ammonia, and because the flue gas flow rate of a horizontal flue of the circulating fluidized bed boiler is high and the retention time of the ammonia water is limited, the existing treatment mode cannot fully perform chemical reaction, so that some NOx is still discharged into the atmosphere, and the pollution to the atmospheric environment is caused.
Therefore, in order to solve the above technical problems, it is an important subject of research by those skilled in the art to find an ultra-clean discharge method suitable for a boiler.
Disclosure of Invention
The embodiment of the invention discloses an ultra-clean emission method suitable for a boiler, which is used for solving the technical problem that NOx discharged during combustion of the existing boiler cannot be fully treated, so that the atmosphere is polluted.
The embodiment of the invention provides an ultra-clean discharge method suitable for a boiler, which comprises the following steps:
s100, constructing a physical model of a hearth of the boiler by using Gambit software, and performing grid division on the physical model of the hearth;
step 200, importing the physical model subjected to grid division into Fluent software, and setting boundary conditions of an inlet and an outlet of a boiler;
step S300, setting fuel components of a boiler combustion process by using prePDF software, introducing the fuel components into the Fluent software, and calculating by the Fluent software to obtain a simulation result;
s400, comparing and analyzing a hearth speed field and turbulence intensity distribution condition with a boiler horizontal flue outlet speed field and turbulence intensity distribution condition according to a simulation result;
and S500, selecting spray guns for spraying ammonia water respectively additionally on the inner sides of the inlet section of the left cyclone separator and the inlet section of the right cyclone separator which have the fastest flue gas flow speed at the outlet of the horizontal flue of the boiler according to the analysis result.
Optionally, the inlet boundary conditions of the boiler are inlet velocity, inlet pressure, inlet temperature;
and outlet boundary conditions of the boiler comprise outlet speed, outlet pressure and outlet temperature.
Optionally, the step S100 specifically includes:
And constructing a physical model of a hearth of the boiler by using Gambit software, and performing grid division on a combustion system and a return system of the hearth.
Optionally, the step S500 specifically includes:
and 3 spray guns for spraying 20% concentration ammonia water are respectively added to the inner sides of the inlet section of the left cyclone separator and the inlet section of the right cyclone separator which have the fastest flue gas flow speed at the outlet of the horizontal flue of the boiler according to the analysis result.
Optionally, the boiler is a circulating fluidized bed boiler.
According to the technical scheme, the embodiment of the invention has the following advantages:
the embodiment of the invention provides an ultra-clean emission method suitable for a boiler, which comprises the following steps of S100, constructing a physical model of a hearth of the boiler by using Gambit software, and carrying out grid division on the physical model of the hearth; step 200, importing the physical model subjected to grid division into Fluent software, and setting boundary conditions of an inlet and an outlet of a boiler; step S300, setting fuel components of a boiler combustion process by using prePDF software, introducing the fuel components into the Fluent software, and calculating by the Fluent software to obtain a simulation result; s400, comparing and analyzing a hearth speed field and turbulence intensity distribution condition with a boiler horizontal flue outlet speed field and turbulence intensity distribution condition according to a simulation result; and S500, selecting spray guns for spraying ammonia water respectively additionally on the inner sides of the inlet section of the left cyclone separator and the inlet section of the right cyclone separator which have the fastest flue gas flow speed at the outlet of the horizontal flue of the boiler according to the analysis result. In this embodiment, through the boiler as the research object, use numerical simulation software Fluent, carried out numerical simulation to the combustion process of boiler to select to increase to arrange 3 spray guns at the fastest left and right handed wind separator inlet section inboard of boiler horizontal flue outlet flue gas velocity, increase the contact reaction area of aqueous ammonia and flue gas, reach super clean emission requirement.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
FIG. 1 is a schematic flow chart illustrating an ultra-clean discharge method for a boiler according to an embodiment of the present invention.
Detailed Description
The embodiment of the invention discloses an ultra-clean emission method suitable for a boiler, which is used for solving the technical problem that NOx discharged during combustion of the existing boiler cannot be fully treated, so that the atmosphere is polluted.
In order that those skilled in the art will better understand the disclosure, the invention will be described in further detail with reference to the accompanying drawings and specific embodiments. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, an ultra-clean discharging method for a boiler according to an embodiment of the present invention includes:
s100, constructing a physical model of a hearth of the boiler by using Gambit software, and performing grid division on the physical model of the hearth;
gambit software automatically constructs a physical model of the furnace and performs grid division on the model according to actual specific size parameters of the furnace of the boiler, such as specific parameters of the length, width, height, volume, surface area and the like of the furnace;
step 200, importing the physical model subjected to grid division into Fluent software, and setting boundary conditions of an inlet and an outlet of a boiler;
step S300, setting fuel components of a boiler combustion process by using prePDF software, introducing the fuel components into the Fluent software, and calculating by the Fluent software to obtain a simulation result;
s400, comparing and analyzing a hearth speed field and turbulence intensity distribution condition with a boiler horizontal flue outlet speed field and turbulence intensity distribution condition according to a simulation result;
and S500, selecting spray guns for spraying ammonia water respectively additionally on the inner sides of the inlet section of the left cyclone separator and the inlet section of the right cyclone separator which have the fastest flue gas flow speed at the outlet of the horizontal flue of the boiler according to the analysis result.
In this embodiment, through the boiler as the research object, use numerical simulation software Fluent, carried out numerical simulation to the combustion process of boiler to select to increase to arrange 3 spray guns at the fastest left and right handed wind separator inlet section inboard of boiler horizontal flue outlet flue gas velocity, increase the contact reaction area of aqueous ammonia and flue gas, reach super clean emission requirement.
After the treatment by the method, the average hourly emission amount of NOx of the existing boiler is less than 50mg/Nm3。
Further, the inlet boundary conditions of the boiler are inlet speed, inlet pressure and inlet temperature;
and outlet boundary conditions of the boiler comprise outlet speed, outlet pressure and outlet temperature.
Further, the step S100 specifically includes:
and constructing a physical model of a hearth of the boiler by using Gambit software, and performing grid division on a combustion system and a return system of the hearth.
Further, the step S500 specifically includes:
and 3 spray guns for spraying 20% concentration ammonia water are respectively added to the inner sides of the inlet section of the left cyclone separator and the inlet section of the right cyclone separator which have the fastest flue gas flow speed at the outlet of the horizontal flue of the boiler according to the analysis result.
Further, the boiler is a circulating fluidized bed boiler.
The above is a detailed description of a specific process of the ultra-clean discharging method for a boiler according to an embodiment of the present invention, and the method will be further described with an application example, and the application example of the ultra-clean discharging method for a boiler according to the present invention includes:
aiming at the following problems, 1, the denitration reducing agent is ammonia water with the concentration of 20%; 2. the ideal temperature range of ammonia water and NOx is 850-1100 deg.c, and the actual temperature of horizontal flue of circulating fluidized bed boiler is lower than the ideal reaction temperature window (800-830 deg.c); 3. the flue gas flow rate of a horizontal flue of the circulating fluidized bed boiler is high, and the chemical reaction is often not sufficiently performed due to the limitation of the retention time of ammonia water; 4. the local ash deposition at the inlet of the horizontal flue of the circulating fluidized bed boiler is hardened, and the sectional area of the inlet is reduced to accelerate the flow rate of flue gas; 5. ammonia escape can be caused by the increase of ammonia gas, and ammonium bisulfate and ammonium sulfate can be generated when sulfur dioxide is encountered, so that the air preheater is easy to be blocked and has corrosion danger; carrying out numerical simulation of a flow field in a boiler, selecting a 320t/h circulating fluidized bed boiler as a research object, using numerical simulation software FLUENT to carry out numerical simulation on the combustion process, firstly using Gambit software as pretreatment software to construct a physical model of a boiler furnace, carrying out grid division on a combustion and return system of the whole furnace, then defining boundary conditions of a boiler operation inlet and an outlet in the FLUENT software, using prePDF to define fuel components in the combustion process and leading the fuel components into the FLUENT, obtaining a corresponding simulation result through FLUENT calculation, carrying out comparative analysis on a furnace speed field and turbulence intensity distribution condition and a boiler horizontal flue outlet speed field and turbulence intensity distribution condition through the simulation result, selecting 3 spray guns to be additionally arranged on the inner sides of inlet sections of left and right cyclone separators with the highest flue gas flow rate at a boiler horizontal flue outlet according to the analysis result, the contact reaction area of the ammonia water and the flue gas is increased, and the ultra-clean emission requirement is met.
While the above description describes in detail a method for ultra-clean discharge of a boiler, those skilled in the art will recognize that there are variations in the embodiments and applications of the method according to the teachings of the present invention, and accordingly, the disclosure should not be construed as limiting the invention.
Claims (5)
1. An ultra-clean discharge method suitable for a boiler, comprising:
s100, constructing a physical model of a hearth of the boiler by using Gambit software, and performing grid division on the physical model of the hearth;
step 200, importing the physical model subjected to grid division into Fluent software, and setting boundary conditions of an inlet and an outlet of a boiler;
step S300, setting fuel components of a boiler combustion process by using prePDF software, introducing the fuel components into the Fluent software, and calculating by the Fluent software to obtain a simulation result;
s400, comparing and analyzing a hearth speed field and turbulence intensity distribution condition with a boiler horizontal flue outlet speed field and turbulence intensity distribution condition according to a simulation result;
and S500, selecting spray guns for spraying ammonia water respectively additionally on the inner sides of the inlet section of the left cyclone separator and the inlet section of the right cyclone separator which have the fastest flue gas flow speed at the outlet of the horizontal flue of the boiler according to the analysis result.
2. The ultra-clean discharging method for the boiler as claimed in claim 1, wherein the boundary conditions of the inlet of the boiler are inlet speed, inlet pressure, inlet temperature;
and outlet boundary conditions of the boiler comprise outlet speed, outlet pressure and outlet temperature.
3. The ultra-clean discharging method suitable for the boiler according to the claim 1, wherein the step S100 specifically comprises:
and constructing a physical model of a hearth of the boiler by using Gambit software, and performing grid division on a combustion system and a return system of the hearth.
4. The ultra-clean discharging method for the boiler as recited in claim 1, wherein the step S500 specifically comprises:
and 3 spray guns for spraying 20% concentration ammonia water are respectively added to the inner sides of the inlet section of the left cyclone separator and the inlet section of the right cyclone separator which have the fastest flue gas flow speed at the outlet of the horizontal flue of the boiler according to the analysis result.
5. The ultra-clean discharging method for the boiler as claimed in claim 1, wherein the boiler is a circulating fluidized bed boiler.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910950909.6A CN111841275A (en) | 2019-10-08 | 2019-10-08 | Ultra-clean discharge method suitable for boiler |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910950909.6A CN111841275A (en) | 2019-10-08 | 2019-10-08 | Ultra-clean discharge method suitable for boiler |
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| CN111841275A true CN111841275A (en) | 2020-10-30 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116976162A (en) * | 2023-06-16 | 2023-10-31 | 武汉光谷蓝焰新能源股份有限公司 | Denitration design simulation method based on biomass boiler finite element analysis |
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2019
- 2019-10-08 CN CN201910950909.6A patent/CN111841275A/en active Pending
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116976162A (en) * | 2023-06-16 | 2023-10-31 | 武汉光谷蓝焰新能源股份有限公司 | Denitration design simulation method based on biomass boiler finite element analysis |
| CN116976162B (en) * | 2023-06-16 | 2024-01-30 | 武汉光谷蓝焰新能源股份有限公司 | Denitration design simulation method based on biomass boiler finite element analysis |
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