CN108654352A - A kind of denitrating system of suitable biomass boiler - Google Patents
A kind of denitrating system of suitable biomass boiler Download PDFInfo
- Publication number
- CN108654352A CN108654352A CN201810700816.3A CN201810700816A CN108654352A CN 108654352 A CN108654352 A CN 108654352A CN 201810700816 A CN201810700816 A CN 201810700816A CN 108654352 A CN108654352 A CN 108654352A
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- CN
- China
- Prior art keywords
- biomass
- spray gun
- air
- burner hearth
- denitration
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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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
- B01D53/79—Injecting reactants
Abstract
A kind of denitrating system of suitable biomass boiler, the present invention includes biomass denitration spray gun and mating reducing agent prepares and transport system, distribution system, atomizing air system, cooling air system, reducing agent is injected directly into burner hearth central area by the way that the denitration spray gun goed deep into burner hearth is arranged, denitration reaction region can be expanded, simultaneously because of the presence of cooling wind, burner hearth center anaerobic condition can be alleviated, boiler combustion efficiency is improved, the present invention has many advantages, such as to be transformed and arrange that convenient, denitration efficiency is high, helps to improve boiler combustion efficiency.
Description
Technical field
The present invention relates to environmental technology field, more particularly to a kind of denitrating system of suitable biomass boiler.
Background technology
Biomass boiler is the boiler for making fuel with biomass energy.Waste in agricultural production process, such as crops
Stalk (corn stalk, sorghum stalks, wheat straw, straw, beanstalk and cotton stalk etc.), agricultural machining industry waste (rice husk) etc. all can be used as
The fuel of biomass boiler, biomass boiler discharge sulfur dioxide in flue gas, amount of nitrogen oxides are relatively low, therefore and coal-burning boiler
It compares, biomass energy feature is recyclability, low stain, widely distributed property, total amount very abundant.But as country is to pot
Kiln gas discharges the raising of environmental protection standard, and biomass boiler has been not suitable with new environmental requirement.Existing various regions have required biomass
The discharge standard of boiler smoke presses GB 13223-2011《Fossil-fuel power plant atmospheric pollutant emission standard》It executes, i.e. dirt, titanium dioxide
Sulphur, nitrogen oxides emission limit be 30,200,200mg/m3, wherein key area presses 20,50,100mg/m3It executes.Through to life
The investigation of substance boiler smoke, test, analysis, biomass boiler flue gas have following features：1. fire box temperature difference is big, biomass pot
Stove mainly has grate furnace and Circulation fluidized-bed furnace, each type of furnace is divided into as medium temperature and medium pressure stove, secondary high temperature sub-high pressure stove, high temperature and pressure
Stove, fire box temperature are respectively 700~760 DEG C, 880~950 DEG C, 850~1100 DEG C；2. sulfur dioxide, nitrous oxides concentration be low,
Fluctuation is big, and sulfur dioxide, nitrogen oxide mass concentration are in 100~250mg/m when pure biomass of burning3Fluctuation, as mixed in fuel
Parasitic mode plate, timber, bark, sulfur dioxide in flue gas, nitrogen oxide mass concentration are in 250~600mg/m3Fluctuation, instantaneously also may be used
Up to 1g/m3More than.
SNCR belongs to selective non-catalytic reduction technology, and SNCR technologies are suitable for furnace outlet gas temperature and meet 800~1100
DEG C boiler, denitration efficiency is relatively low when being less than this temperature, and ammonia and flue gas mix effect and have a significant impact denitration efficiency (as revolved
It is relatively good that wind inlet region mixes effect).It such as mixes that insufficient, the reaction time is inadequate, to reach identical denitration efficiency, can increase
Operating cost, while there is also excessive problems for tail gas the escaping of ammonia.SO in another biomass boiler flue gas3Content is often higher, 280
The problems such as DEG C low-temperature space equipment below, there are sulfate to block, corrosion.SNCR denitration efficiency also with cigarette in nitrogen oxides
Initial concentration is related, and biomass boiler SNCR denitration efficiency is 20%~50%.
Currently, biomass boiler denitration is generally carried out using SNCR+SCR technologies, however, as CFB boiler capacity increases,
Section of burner hearth increases therewith, and distance of the SNCR denitrification spray gun that surrounding side wall is arranged apart from burner hearth center is up to several meters to more than ten
Rice, it is difficult to reach burner hearth central area by spraying and spreading to make reducing agent, so that conversion zone is reduced, is dropped so as to cause denitration efficiency
It is low.
Invention content
In order to overcome the above-mentioned deficiencies of the prior art, the purpose of the present invention is to provide a kind of the de- of suitable biomass boiler
Nitre system has many advantages, such as to be transformed and arrange that convenient, denitration efficiency is high, helps to improve boiler combustion efficiency.
To achieve the goals above, the technical solution adopted by the present invention is：
A kind of denitrating system of suitable biomass boiler, including biomass burner hearth 3 and the life that is arranged in biomass burner hearth 3
Substance denitration spray gun 4 and the preparation of mating reducing agent and transport system, distribution system, atomizing air system, cooling air system
System；3 lower layer of biomass burner hearth is provided with fluidization hood 2, and 3 bottom of biomass burner hearth is provided with air compartment 1, the biology
In in burner hearth 3, the other end of biomass denitration spray gun 4 is placed in inside the air compartment 1 of 3 lower section of burner hearth 4 arrangement of nozzles of matter denitration spray gun
Or it is external；
Reducing agent prepares and transport system, for providing reducing agent for biomass denitration spray gun 4；
Atomizing air system, for providing atomizing air air source for biomass denitration spray gun 4；
Cooling air system, for providing cooling air wind regime for biomass denitration spray gun 4；
Distribution system, for being allocated to the gas inside biomass denitration spray gun 4.
The biomass denitration spray gun 4 is made of atomizing air casing 5, spray gun core pipe 6, cooling air casing 7, spray gun
Atomizing air casing 5 and cooling air casing 7 are socketed in core pipe 6.
4 nozzle of biomass denitration spray gun is 0 meter to 10 meters away from 2 height of fluidization hood, and multiple trepannings are arranged at 4 top of spray gun
Surrounding is arranged, realizes surrounding atomization.
The cooling air wind regime of 4 cooling air system of biomass denitration spray gun is First air or Secondary Air.
The atomizing air air source of 4 atomizing air system of biomass denitration spray gun can be carried by roots blower or air compressor machine
For.
One or more sets are arranged in each Boiler Furnace in the biomass denitration spray gun 4, when more sets are set, each spray gun
It is highly equal or unequal, it is distributed and is arranged according to in-furnace temperature.
7 side towards the fire of cooling air casing is laid with abrasion-proof and refractory pouring material.
Prepared by the reducing agent and transport system includes reducing agent device 10, and the reducing agent device 10 passes through pump 10
It is connected with flowmeter 8 with biomass denitration spray gun 4.
Beneficial effects of the present invention：
The present invention directly send reducing agent to center and NO through the inventionxIt is reacted, conversion zone is wider, denitration effect
Rate is higher；System can first install cooling collar, and spray gun is conveniently replaced, and the system reform and arrangement are convenient；Spray gun cooling wind is simultaneously
Burning oxygen amount is provided for burner hearth center, boiler combustion efficiency is higher.
Description of the drawings
Fig. 1 is arrangement schematic diagram in burner hearth of the present invention.
Fig. 2 is present system schematic diagram.
Fig. 3 is spray gun schematic diagram.
Fig. 4 is atomizing air sleeve A to schematic diagram.
Specific implementation mode
Invention is further described in detail below in conjunction with the accompanying drawings.
Referring to Fig. 1, a kind of denitrating system of suitable biomass boiler provided by the invention, including：It is arranged in biomass stove
Biomass denitration spray gun 4 in thorax 3 and mating reducing agent prepares and transport system, distribution system, atomizing air system, cold
But air system；Biomass denitration spray gun 4 is made of atomizing air casing 5, spray gun core pipe 6, cooling air casing 7；
Further, 4 arrangement of nozzles of biomass denitration spray gun is in burner hearth 3, away from 2 height of fluidization hood be 0 meter extremely
10 meters, 4 top of spray gun has multiple trepanning surroundings to arrange, realizes surrounding atomization；
Further, the other end of the biomass denitration spray gun 4 is placed in air compartment 1 inside or outer of 3 lower section of burner hearth
Portion；
Further, the 4 cooling air wind regime of biomass denitration spray gun is First air or Secondary Air；
Further, the 4 atomizing air air source of biomass denitration spray gun can be provided by roots blower or air compressor machine；
Further, one or more sets are arranged in each Boiler Furnace in biomass denitration spray gun 4, each to spray when more sets are arranged
The height of rifle is equal or unequal, is distributed and is arranged according to in-furnace temperature；
Further, 7 side towards the fire of cooling air casing is laid with abrasion-proof and refractory pouring material.
As shown in Figure 2：Prepared by the reducing agent and transport system includes reducing agent device 10, the reducing agent device
10 are connected by pump 10 with flowmeter 8 with biomass denitration spray gun 4.
As shown in Fig. 3 Fig. 4：The biomass denitration spray gun 4 is by atomizing air casing 5, spray gun core pipe 6, cooling air
Casing 7 forms, and atomizing air casing 5 and cooling air casing 7 are socketed in spray gun core pipe 6.
The present invention operation principle be：
Denitrification reducing agent is directly sent through the invention to center and NOxIt is reacted, conversion zone is wider, denitration efficiency
It is higher；System can first install cooling collar, and spray gun is conveniently replaced, and the system reform and arrangement are convenient；Spray gun cooling wind is simultaneously
Burner hearth center provides burning oxygen amount, and boiler combustion efficiency is higher.The present invention has transformation and arranges that convenient, denitration efficiency is high, helps
In improve boiler combustion efficiency the advantages that.
Claims (8)
1. a kind of denitrating system of suitable biomass boiler, which is characterized in that including biomass burner hearth (3) and be arranged in biomass
Biomass denitration spray gun (4) and mating reducing agent in burner hearth (3) prepare and transport system, distribution system, atomizing air
System, cooling air system；Described biomass burner hearth (3) lower layer is provided with fluidization hood (2), biomass burner hearth (3) bottom
It is provided with air compartment (1), biomass denitration spray gun (4) arrangement of nozzles is interior in burner hearth (3), biomass denitration spray gun (4)
It is internal or external that the other end is placed in the air compartment (1) below burner hearth (3)；
Reducing agent prepares and transport system, for providing reducing agent for biomass denitration spray gun (4)；
Atomizing air system, for providing atomizing air air source for biomass denitration spray gun (4)；
Cooling air system, for providing cooling air wind regime for biomass denitration spray gun (4)；
Distribution system is allocated for the gas internal to biomass denitration spray gun (4).
2. a kind of denitrating system of suitable biomass boiler according to claim 1, which is characterized in that the biomass
Denitration spray gun (4) is made of atomizing air casing (5), spray gun core pipe (6), cooling air casing (7), and spray gun core pipe covers on (6)
It is connected to atomizing air casing (5) and cooling air casing (7).
3. a kind of denitrating system of suitable biomass boiler according to claim 1, which is characterized in that the biomass is de-
Nitre spray gun (4) nozzle is highly 0 meter to 10 meters away from fluidization hood (2), has multiple trepanning surroundings to arrange at the top of spray gun (4).
4. a kind of denitrating system of suitable biomass boiler according to claim 1, which is characterized in that the biomass
The cooling air wind regime of denitration spray gun (4) cooling air system is First air or Secondary Air.
5. a kind of denitrating system of suitable biomass boiler according to claim 1, which is characterized in that the biomass is de-
The atomizing air air source of nitre spray gun (4) atomizing air system can be provided by roots blower or air compressor machine.
6. a kind of denitrating system of suitable biomass boiler according to claim 1, which is characterized in that the biomass
One or more sets are arranged in each Boiler Furnace in denitration spray gun (4), and when more sets are arranged, the height of each spray gun is equal or unequal.
7. a kind of denitrating system of suitable biomass boiler according to claim 1, which is characterized in that described is cooling empty
Gas bushing (7) side towards the fire is laid with abrasion-proof and refractory pouring material.
8. a kind of denitrating system of suitable biomass boiler according to claim 1, which is characterized in that the reducing agent
Prepare and transport system include reducing agent device (10), the reducing agent device (10) by pump (10) and flowmeter (8) with
Biomass denitration spray gun (4) is connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810700816.3A CN108654352A (en) | 2018-06-29 | 2018-06-29 | A kind of denitrating system of suitable biomass boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810700816.3A CN108654352A (en) | 2018-06-29 | 2018-06-29 | A kind of denitrating system of suitable biomass boiler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108654352A true CN108654352A (en) | 2018-10-16 |
Family
ID=63773242
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810700816.3A Withdrawn CN108654352A (en) | 2018-06-29 | 2018-06-29 | A kind of denitrating system of suitable biomass boiler |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108654352A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111359414A (en) * | 2020-03-16 | 2020-07-03 | 中国华能集团清洁能源技术研究院有限公司 | CFB boiler deep peak regulation composite type adjustable SNCR denitration system and method |
-
2018
- 2018-06-29 CN CN201810700816.3A patent/CN108654352A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111359414A (en) * | 2020-03-16 | 2020-07-03 | 中国华能集团清洁能源技术研究院有限公司 | CFB boiler deep peak regulation composite type adjustable SNCR denitration system and method |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20181016 |
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| WW01 | Invention patent application withdrawn after publication |