CN112807982A - Chain boiler SNCR (selective non-catalytic reduction) denitration method, polymerization-dispersion type flue gas mixed reaction furnace arch and chain boiler SNCR denitration system - Google Patents
Chain boiler SNCR (selective non-catalytic reduction) denitration method, polymerization-dispersion type flue gas mixed reaction furnace arch and chain boiler SNCR denitration system Download PDFInfo
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- 239000003546 flue gas Substances 0.000 title claims abstract description 78
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 71
- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000006243 chemical reaction Methods 0.000 title claims abstract description 21
- 239000006185 dispersion Substances 0.000 title claims abstract description 17
- 238000010531 catalytic reduction reaction Methods 0.000 title abstract description 8
- 238000002485 combustion reaction Methods 0.000 claims abstract description 64
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 24
- 239000007921 spray Substances 0.000 claims abstract description 23
- 238000009792 diffusion process Methods 0.000 claims abstract description 21
- 239000003595 mist Substances 0.000 claims abstract description 20
- 238000006722 reduction reaction Methods 0.000 claims abstract description 8
- 238000006116 polymerization reaction Methods 0.000 claims description 20
- 230000005855 radiation Effects 0.000 claims description 13
- 238000003756 stirring Methods 0.000 claims description 8
- 239000004449 solid propellant Substances 0.000 claims description 7
- 238000005336 cracking Methods 0.000 claims description 6
- 239000007789 gas Substances 0.000 claims description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 5
- 239000001301 oxygen Substances 0.000 claims description 5
- 229910052760 oxygen Inorganic materials 0.000 claims description 5
- 239000000779 smoke Substances 0.000 claims description 4
- 230000002776 aggregation Effects 0.000 claims description 2
- 238000004220 aggregation Methods 0.000 claims description 2
- 239000011819 refractory material Substances 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 7
- 239000010881 fly ash Substances 0.000 description 4
- 230000003197 catalytic effect Effects 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 230000002708 enhancing effect Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000009423 ventilation Methods 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
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/77—Liquid phase processes
- B01D53/79—Injecting reactants
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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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23B—METHODS OR APPARATUS FOR COMBUSTION USING ONLY SOLID FUEL
- F23B30/00—Combustion apparatus with driven means for agitating the burning fuel; Combustion apparatus with driven means for advancing the burning fuel through the combustion chamber
- F23B30/02—Combustion apparatus with driven means for agitating the burning fuel; Combustion apparatus with driven means for advancing the burning fuel through the combustion chamber with movable, e.g. vibratable, fuel-supporting surfaces; with fuel-supporting surfaces that have movable parts
- F23B30/06—Combustion apparatus with driven means for agitating the burning fuel; Combustion apparatus with driven means for advancing the burning fuel through the combustion chamber with movable, e.g. vibratable, fuel-supporting surfaces; with fuel-supporting surfaces that have movable parts with fuel supporting surfaces that are specially adapted for advancing fuel through the combustion zone
- F23B30/08—Combustion apparatus with driven means for agitating the burning fuel; Combustion apparatus with driven means for advancing the burning fuel through the combustion chamber with movable, e.g. vibratable, fuel-supporting surfaces; with fuel-supporting surfaces that have movable parts with fuel supporting surfaces that are specially adapted for advancing fuel through the combustion zone with fuel-supporting surfaces that move through the combustion zone, e.g. with chain grates
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J7/00—Arrangement of devices for supplying chemicals to fire
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23M—CASINGS, LININGS, WALLS OR DOORS SPECIALLY ADAPTED FOR COMBUSTION CHAMBERS, e.g. FIREBRIDGES; DEVICES FOR DEFLECTING AIR, FLAMES OR COMBUSTION PRODUCTS IN COMBUSTION CHAMBERS; SAFETY ARRANGEMENTS SPECIALLY ADAPTED FOR COMBUSTION APPARATUS; DETAILS OF COMBUSTION CHAMBERS, NOT OTHERWISE PROVIDED FOR
- F23M5/00—Casings; Linings; Walls
- F23M5/06—Crowns or roofs for combustion chambers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
-
- 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
- F23J2215/10—Nitrogen; Compounds thereof
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Abstract
The invention discloses an SNCR (selective non-catalytic reduction) denitration method for a chain boiler, a polymerization-dispersion type flue gas mixed reaction furnace arch and an SNCR denitration system for the chain boiler, wherein the denitration method comprises the following steps: arranging a denitration spray gun in a high-temperature area at the center of flame of a combustion chamber of a boiler hearth, and reversely contacting and mixing a mist denitration agent sprayed by a nozzle of the denitration spray gun with hot flue gas; then, the mist denitration agent is distributed to a combustion chamber of a boiler hearth at a diffusion opening of a furnace arch, so that NO and NO in the mist denitration agent and the flue gas2Contact-generated thermochemical reductionReaction to produce N2And H2O; its reaction effect is good, and is efficient, can realize the intensive mixing of denitrifier and hot flue gas, and the burning is abundant, can also improve the temperature distribution homogeneity in the boiler furnace simultaneously, improves the thermal efficiency of boiler.
Description
Technical Field
The invention belongs to the technical field of environmental protection of environmental management, and particularly relates to an SNCR (selective non-catalytic reduction) denitration method for a chain boiler, a polymerization-dispersion type flue gas mixed reaction furnace arch and an SNCR denitration system for the chain boiler.
Background
Because the temperature fluctuation of the hearth of the chain boiler is large and the operation load is unstable, the existing denitration process can not be adopted to remove NOx. Specially for treating diabetesIn addition, the biomass-fired chain boiler which is popularized and used at present has low temperature of a boiler furnace outlet and high content of flue gas fly ash, and even if the denitration is performed by a Selective Catalytic Reduction (SCR) Catalytic Reduction method, the emission control effect can be achieved at the initial stage of the installation, but after the biomass-fired chain boiler runs for a period of time, the fly ash causes the Catalytic reactor to be blocked and poisoned, so that the reaction effect is poor or even ineffective.
The boiler arch is used for enhancing the mixing of air flow in the boiler and reasonably organizing the heat radiation and hot smoke flowing in the boiler so as to achieve the purposes of timely ignition, vigorous combustion and full combustion. However, in the prior art, the furnace arches of the chain boilers are all of a structure with a low front part and a high back part, and the ventilation cross sections of the furnace arches are of a square structure, so that the furnace arches have the function of organizing radiation in the furnace, but the furnace arches are difficult to achieve the full mixing of hot flue gas in the furnace, so that in the combustion process, on one hand, the flame fullness of a boiler furnace is poor, the combustion of the hot flue gas is insufficient, on the other hand, the temperature distribution in the boiler furnace is uneven, and the thermal efficiency.
Disclosure of Invention
The invention provides a chain boiler SNCR (Selective Non-Catalytic Reduction) denitration method, a polymerization-dispersion type flue gas mixed reaction furnace arch and a chain boiler SNCR denitration system, aiming at solving the problems that the prior art can not adopt the prior denitration technology to remove NOx, or after SCR denitration is adopted for a period of time, a Catalytic reactor is blocked and poisoned by fly ash, so that the reaction effect is poor, even invalid; and the problems that the chain boiler arch in the prior art hardly achieves the sufficient mixing of hot flue gas in the boiler, the flame fullness of a boiler furnace is poor in the combustion process, the combustion of the hot flue gas is insufficient, the temperature distribution in the boiler furnace is uneven, the thermal efficiency of the boiler is low and the like are solved.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention firstly provides an SNCR denitration method of a chain boiler, which comprises the following steps,
arranging a denitration spray gun in a high-temperature area at the center of flame of a combustion chamber of a boiler hearth, and reversely contacting and mixing a mist denitration agent sprayed by a nozzle of the denitration spray gun with hot flue gas;
then, the mist denitration agent is distributed to a combustion chamber of a boiler hearth at a diffusion opening of a furnace arch, so that NO and NO in the mist denitration agent and the flue gas2Contact to generate N through thermochemical reduction reaction2And H2O。
The SNCR denitration method of the chain boiler further comprises the step of dividing the combustion chamber of the boiler furnace into an upper combustion chamber and a lower combustion chamber when a denitration spray gun is arranged in a high-temperature region at the flame center of the combustion chamber of the boiler furnace, wherein the lower combustion chamber supplies heat and radiation ignition for cracking solid fuel on a chain grate by means of radiation heat of a polymerization opening of a furnace arch.
The SNCR denitration method of the chain boiler further comprises the step of arranging the denitration spray gun at the convergence of the furnace arch when the denitration spray gun is arranged in the high-temperature area of the flame center of the combustion chamber of the boiler hearth.
According to the SNCR denitration method of the chain boiler, further, the combustion chamber at the lower part provides heat for cracking of solid fuel on the chain grate by means of radiant heat of a polymerization opening of a furnace arch, and after radiant ignition, the flue gas flowing in from the rear part of the chain grate forms collision, stirring and vortex at the polymerization opening, so that flue gas mixing is realized.
The SNCR denitration method of the chain grate boiler further comprises the steps of enabling flue gas flowing from the rear part of the chain grate to form collision, stirring and vortex at the polymerization port, enabling volatile components and combustible gas generated by preliminary mixed combustion with oxygen to pass through the furnace arch after mixing of the flue gas is achieved, enabling the flue gas to be mixed again at the convergence port of the furnace arch, enabling the mixed flue gas to enter the diffusion port of the furnace arch and be uniformly dispersed into the combustion chamber at the upper part to achieve combustion, mixing and distributing the mist denitration agent into the boiler hearth, and enabling the mist denitration agent and NO in the flue gas to be mixed2Contact to generate N through thermochemical reduction reaction2And H2O。
The invention provides a polymerization-dispersion type flue gas mixed reaction furnace arch for realizing the SNCR denitration method of the chain boiler, which comprises a furnace arch formed by a refractory material wall, wherein the furnace arch is provided with a polymerization port, a convergence port and a diffusion port which are sequentially distributed from bottom to top; the aggregation port is used for gathering and collecting the smoke; the convergence port is used for mixing the flue gas; and the diffusion port is used for diffusing the mixed flue gas to a combustion chamber of a boiler hearth.
The polymerization-dispersion type flue gas mixing reaction furnace arch of the invention is further characterized in that the polymerization opening is circular.
The invention also provides an SNCR (selective non-catalytic reduction) denitration system of the chain boiler, which is used for realizing the SNCR denitration method of the chain boiler and comprises a boiler furnace chamber, wherein a boiler chain grate is arranged at the bottom in the boiler furnace chamber, a polymerization-dispersion type flue gas mixed reaction furnace arch provided by the invention is arranged on the boiler chain grate, a denitration spray gun is arranged at the convergence port of the furnace arch, and a nozzle is arranged at the end part of the denitration spray gun.
The SNCR denitration system of the chain boiler is characterized in that the number of the furnace arches is more than two.
The invention has the beneficial effects that:
the chain boiler SNCR denitration method, the polymerization-dispersion type flue gas mixed reaction furnace arch and the chain boiler SNCR denitration system can solve the problems that the prior denitration technology can not be adopted to remove NOx, or after SCR denitration is adopted for operation for a period of time, a catalytic reactor is blocked and poisoned by fly ash, so that the reaction effect is poor or even invalid; the problems that the furnace arch of the chain boiler in the prior art is difficult to achieve the full mixing of hot flue gas in the furnace, the flame fullness of a boiler furnace is poor in the combustion process, the combustion of the hot flue gas is insufficient, the temperature distribution in the boiler furnace is uneven, the heat efficiency of the boiler is low and the like are solved; the denitration agent and hot flue gas full-mixing device has the advantages of good reaction effect, high efficiency, full mixing of the denitration agent and the hot flue gas, full combustion, improvement of the temperature distribution uniformity in a boiler furnace and improvement of the thermal efficiency of a boiler.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic view of the convergence, convergence and diffusion of the arch of the polymerization-dispersion type flue gas mixing reactor of the present invention.
FIG. 2 is a schematic view of the convergence of the arch of the polymerization-dispersion type flue gas mixing reaction furnace of the present invention.
FIG. 3 is a schematic structural diagram of an SNCR denitration system of a chain boiler.
In the figure, 1 is a boiler furnace, 2 is a denitration spray gun, 3 is a nozzle, 4 is a furnace arch, 5 is a diffusion port, 6 is a polymerization port, 7 is a chain grate, 8 is a convergence port, and 9 is a refractory wall.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the specific embodiments of the present invention and the accompanying drawings. 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.
The technical solutions provided by the embodiments of the present invention are described in detail below with reference to the accompanying drawings.
Example 1
The SNCR denitration method of the chain boiler comprises the following steps,
arranging a denitration spray gun 2 in a high-temperature area at the center of flame of a combustion chamber of a boiler hearth 1, and reversely contacting and mixing a mist denitration agent sprayed by a nozzle 3 of the denitration spray gun 2 with hot flue gas;
then, the mist denitration agent is distributed to a combustion chamber of a boiler hearth 1 at a diffusion opening 5 of a furnace arch 4, so that NO and NO in the mist denitration agent and the flue gas2Contact to generate N through thermochemical reduction reaction2And H2O。
Among them, it is preferable that the mist of the denitration agent is uniformly distributed to the combustion chamber of the boiler furnace 1 at the diffusion opening 5 of the arch 4.
Example 2
The SNCR denitration method of the chain boiler of example 1, further, when the denitration lance 2 is disposed in the high temperature region of the flame center of the combustion chamber of the boiler furnace 1, the combustion chamber of the boiler furnace 1 is divided into an upper combustion chamber and a lower combustion chamber, and the lower combustion chamber provides heat and radiation ignition for cracking the solid fuel on the chain grate 7 by means of the radiation heat of the polymerization opening 6 of the furnace arch 4.
Further, when the denitration spray gun 2 is arranged in the high-temperature area of the flame center of the combustion chamber of the boiler furnace 1, the denitration spray gun 2 is arranged at the convergence port 8 of the furnace arch 4.
Furthermore, the combustion chamber at the lower part provides heat for cracking solid fuel on the chain grate 7 and radiation ignition by means of radiation heat of the convergence port 6 of the furnace arch 4, so that the flue gas flowing in from the rear part of the chain grate 7 forms collision, stirring and vortex at the convergence port 6, and flue gas mixing is realized.
Further, the flue gas flowing in from the rear part of the traveling grate 7 forms collision, stirring and vortex at the polymerization port 6, after the flue gas is mixed, volatile components and combustible gas generated by preliminary mixed combustion with oxygen pass through the furnace arch 4, firstly, the flue gas is mixed again at the convergence port 8 of the furnace arch 4, then, the mixed flue gas enters the diffusion port 5 of the furnace arch 4 and is uniformly dispersed into the combustion chamber at the upper part to realize combustion, and then, the mist denitration agent is mixed and distributed to the boiler hearth 1, so that NO and NO in the mist denitration agent and the flue gas2Contact to generate N through thermochemical reduction reaction2And H2O。
Wherein, when the flue gas flowing in from the rear part of the chain grate 7 forms collision, stirring and vortex at the position of the polymerization opening 6, the forced mixing of the flue gas is realized. The forced mixing of the flue gas is again achieved at the convergence 8 of the furnace arch 4. Example 3
As shown in fig. 1 to 3, a polymerization-dispersion type flue gas mixed reaction furnace arch for implementing the SNCR denitration method of the chain boiler in embodiment 1 or embodiment 2 includes a furnace arch 4 formed by a refractory wall 9, wherein the furnace arch 4 is provided with a polymerization port 6, a convergence port 8 and a diffusion port 5 which are sequentially distributed from bottom to top; the polymerization port 6 is used for gathering and collecting the flue gas; the convergence port 8 is used for mixing flue gas; and the diffusion port 5 is used for diffusing the mixed flue gas to a combustion chamber of the boiler hearth 1.
Example 4
An SNCR denitration system of a chain boiler, as shown in fig. 1 to 3, for implementing the SNCR denitration method of the chain boiler in embodiment 1 or embodiment 2, includes a boiler furnace 1, a boiler chain grate 7 is installed at the bottom in the boiler furnace 1, a polymerization-dispersion type flue gas mixed reaction furnace arch in embodiment 3 is installed on the boiler chain grate 7, a denitration spray gun 2 is installed at the convergence port 8 of the furnace arch 4, and a nozzle 3 is installed at the end of the denitration spray gun 2.
Further, the number of the furnace arches 4 may be two or more. As shown in fig. 2, i.e. in the case of two furnace arches 4, the polymerization openings 6 and the convergence openings 8 shown in the figure are the polymerization openings 6 and the convergence openings 8 on one of the furnace arches 4, and the diffusion openings 5 shown in the figure are the diffusion openings 5 on the other furnace arch 4.
Aiming at the structural characteristics of a boiler hearth 1 of a chain boiler, the mixing and flowing characteristics of hot flue gas of the boiler hearth and the defects of an existing furnace arch 4; the chain boiler SNCR denitration method, the polymerization-dispersion type flue gas mixed reaction furnace arch and the chain boiler SNCR denitration system of the embodiment can improve the combustion efficiency and the thermal efficiency of the boiler and realize the purpose of adding NO in the flue gasxThe efficiency of emission removal is improved.
The furnace arch 4 is used for enhancing the mixing of hot flue gas flow in the boiler hearth 1 and reasonably organizing the heat radiation and the hot flue gas flow in the boiler hearth 1 so as to achieve the purposes of timely ignition, vigorous combustion and full combustion. The furnace arch 4 can divide the combustion chamber of the boiler hearth 1 into two combustion chambers, and the lower combustion chamber supplies heat to the solid fuel on the traveling grate 7 by means of the radiation heat of the polymerization port 6 of the furnace arch 4 and is ignited by radiation. The high-temperature flue gas flowing in from the rear part of the chain grate 7 is polymerized at the polymerization opening 6The flue gas is mixed in a collision, stirring and vortex mode, so that the retention time of the flue gas flow in the boiler hearth 1 is prolonged, a small part of combustible gas and suspended flying particles are easy to burn out, and the heat loss is reduced. When volatile and combustible gases generated by preliminary mixed combustion with a small amount of oxygen pass through the furnace arch 4, forced mixing is realized again at the position of the convergence port 8, and the mixed hot flue gas enters the diffusion port 5 and is uniformly dispersed to the combustion chamber of the upper hearth to realize combustion. The hot flue gas with the arch 4 structure is uniformly contacted and mixed with oxygen, the heat preservation and combustion promotion effect is good, and the combustion efficiency and the boiler thermal efficiency are improved while the excess air combustion coefficient is reduced. The denitration method comprises the steps of arranging a denitration spray gun 2 at the position of hot flue gas entering a convergence port 8 of a furnace arch 4 by utilizing the high-temperature area of the flame center of a combustion chamber, enabling mist denitration agent sprayed by a nozzle 3 of the denitration spray gun 2 to be in reverse contact with the hot flue gas for mixing, and then quickly distributing the denitration agent to a boiler hearth 1 at a diffusion port 5 of the furnace arch 4 and NO in the flue gas2Contact thermochemical reduction to N2And H2O。
The chain boiler SNCR denitration method, the polymerization-dispersion type flue gas mixed reaction furnace arch, and the chain boiler SNCR denitration system of the above embodiments may be further more specific, where the denitration lance 2 is located at the convergence port 8, and the number of the convergence ports 8 is one or more than two. The polymerization port 6 is a circular port. The center points of the polymerization openings 6, the convergence openings 8 and the diffusion openings 5 of each furnace arch 4 can be located on the same vertical straight line. In practical application, the convergence port 8 is arranged at the nozzle 3 of the denitration spray gun 2 of the SNCR denitration system of the chain boiler.
The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (9)
1. The SNCR denitration method of the chain boiler is characterized by comprising the following steps,
arranging a denitration spray gun in a high-temperature area at the center of flame of a combustion chamber of a boiler hearth, and reversely contacting and mixing a mist denitration agent sprayed by a nozzle of the denitration spray gun with hot flue gas;
then, the mist denitration agent is distributed to a combustion chamber of a boiler hearth at a diffusion opening of a furnace arch, so that NO and NO in the mist denitration agent and the flue gas2Contact to generate N through thermochemical reduction reaction2And H2O。
2. The SNCR denitration method of a chain boiler, as recited in claim 1, characterized in that when a denitration lance is disposed in a high temperature region at the flame center of a combustion chamber of a boiler furnace, the combustion chamber of the boiler furnace is divided into an upper combustion chamber and a lower combustion chamber, and the lower combustion chamber provides heat and radiation ignition for cracking solid fuel on a chain grate by means of radiation heat of a polymerization opening of a furnace arch.
3. The SNCR denitration method of a chain boiler according to claim 1, characterized in that when a denitration lance is arranged in a high temperature region in the center of the flame of a combustion chamber of a boiler furnace, the denitration lance is arranged at a convergence of the crown.
4. The SNCR denitration method of the chain grate boiler in claim 1, wherein the lower combustion chamber relies on radiant heat of a convergent opening of a furnace arch to provide heat for cracking solid fuel on a chain grate, and after radiant ignition, flue gas flowing in from the rear part of the chain grate forms collision, stirring and vortex at the convergent opening to realize flue gas mixing.
5. The SNCR denitration method of a chain grate boiler as set forth in claim 4, characterized in that after the flue gas flowing in from the rear part of the chain grate is formed into collision, stirring and vortex at the convergent opening, and the flue gas is mixed, volatile components and combustible gas generated by preliminary mixed combustion with oxygen are passed through the furnace arch, and firstly, the flue gas is mixed again at the convergent opening of the furnace arch, and then the mixed flue gas enters into the diffusion opening of the furnace arch, and the mixed flue gas is mixed with the combustible gasUniformly dispersing the denitration agent into the combustion chamber at the upper part to realize combustion, and then mixing and distributing the mist denitration agent into a boiler hearth so that NO and NO in the mist denitration agent and smoke gas2Contact to generate N through thermochemical reduction reaction2And H2O。
6. A polymerization-dispersion type flue gas mixed reaction furnace arch for realizing the SNCR denitration method of the chain boiler according to any one of claims 1-5, which is characterized by comprising a furnace arch formed by refractory material walls, wherein the furnace arch is provided with a polymerization port, a convergence port and a diffusion port which are sequentially distributed from bottom to top; the aggregation port is used for gathering and collecting the smoke; the convergence port is used for mixing the flue gas; and the diffusion port is used for diffusing the mixed flue gas to a combustion chamber of a boiler hearth.
7. The arch of claim 6, wherein the mouth is circular.
8. The chain boiler SNCR denitration system is used for realizing the SNCR denitration method of the chain boiler according to any one of claims 1 to 5, and is characterized by comprising a boiler furnace, wherein a boiler chain grate is arranged at the bottom in the boiler furnace, a polymerization-dispersion type flue gas mixed reaction furnace arch according to claim 6 or 7 is arranged on the boiler chain grate, a denitration spray gun is arranged at the convergence port of the furnace arch, and a nozzle is arranged at the end part of the denitration spray gun.
9. The SNCR denitration system of a chain grate boiler according to claim 8, wherein the number of the arches is two or more.
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| CN202011569621.3A CN112807982A (en) | 2020-12-26 | 2020-12-26 | Chain boiler SNCR (selective non-catalytic reduction) denitration method, polymerization-dispersion type flue gas mixed reaction furnace arch and chain boiler SNCR denitration system |
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| CN202011569621.3A CN112807982A (en) | 2020-12-26 | 2020-12-26 | Chain boiler SNCR (selective non-catalytic reduction) denitration method, polymerization-dispersion type flue gas mixed reaction furnace arch and chain boiler SNCR denitration system |
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Application publication date: 20210518 |