CN106237821A - A kind of limekiln denitrating system - Google Patents
A kind of limekiln denitrating system Download PDFInfo
- Publication number
- CN106237821A CN106237821A CN201610573463.6A CN201610573463A CN106237821A CN 106237821 A CN106237821 A CN 106237821A CN 201610573463 A CN201610573463 A CN 201610573463A CN 106237821 A CN106237821 A CN 106237821A
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- CN
- China
- Prior art keywords
- limekiln
- kiln
- spray gun
- denitrating system
- blender
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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
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2/00—Lime, magnesia or dolomite
- C04B2/10—Preheating, burning calcining or cooling
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2/00—Lime, magnesia or dolomite
- C04B2/10—Preheating, burning calcining or cooling
- C04B2/12—Preheating, burning calcining or cooling in shaft or vertical furnaces
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/008—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases cleaning gases
-
- 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
-
- 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
- B01D2251/2067—Urea
-
- 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
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Biomedical Technology (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Analytical Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Treating Waste Gases (AREA)
Abstract
The present invention relates to a kind of limekiln denitrating system, including limekiln and denitrating system.Limekiln is provided with preheating zone, burning zone and cooling zone, denitrating system includes denitrfying agent storage tank, liquid evaporator, surge tank, blender and blower fan, denitrfying agent storage tank passes sequentially through liquid evaporator and surge tank is connected to blender, and blower fan is connected to blender by air pipe line.Limekiln is provided with denitration spray gun, and denitration spray gun is separately mounted to the burning zone in limekiln, exhanst gas outlet and wind porch, and mixer outlet is connected to denitration spray gun.Limekiln is sleeve kiln, double thorax kiln or beam type kiln.The present invention by setting up out of stock system in limekiln; utilizing denitrfying agent to spray into kiln thorax and exhaust gases passes, effectively the oxynitride of flue gas during removing limestone calcination, reduces the amount of nitrogen oxides of limekiln discharge flue gas; be conducive to conservation of nature environment, there is significant social benefit.
Description
Technical field
The invention belongs to industrial smoke processing equipment technical field, relate to a kind of denitration device, be specifically related to a kind of Calx
Kiln denitrating system.
Background technology
Flue gas is the predominant emissions in limekiln, and combustible burns generation in kiln body.It is substantial amounts of owing to flue gas containing
Nitrogen oxides NOXSuch as NO, if these nitrogen oxides are directly discharged in air, meeting contaminated air, form photochemical fog
And acid rain, it is detrimental to health, therefore flue gas has to pass through denitrogenation (i.e. denitration) process before discharge.
Gas denitrifying technology mainly has two kinds at present: SCR (SCR) technology and selective non-catalytic are also
Former denitration (SNCR) technology.SNCR (SNCR) denitration is that the reducing agent containing amino is not being used catalysis
The region that boiler temperature scope is 850～1050 DEG C is uniformly sprayed into, optionally the NOx in flue gas also on the premise of agent
Originally it was N 2And H2O, to reach to reduce discharging the purpose of nitrogen oxides.SNCR denitration technique was applied on CFBB in the past
Denitration efficiency between 30%-50%.
The application for a patent for invention of Publication No. CN 103349898A discloses " a kind of SNCR denitrification apparatus and utilize should
Device carries out the method for denitration ", device includes that Benitration reactor, fuel injection control system, temperature control equipment, reducing agent spray
Injection device, Benitration reactor exhaust pass, Benitration reactor inlet flue duct, fuel system controller, fuel injection control system,
Temperature control equipment, reducing agent injection apparatus, Benitration reactor exhaust pass, Benitration reactor inlet flue duct are installed in denitration
On reactor.Fuel injection control system is connected with temperature control equipment by fuel system controller.But this patent can not
Meet the denitration requirement in limekiln.
Summary of the invention
It is an object of the invention to provide the double-hearth lime kiln of a kind of low-nitrogen oxide discharging, improve denitration effect, to reduce
The amount of nitrogen oxides of limekiln discharge flue gas, meets standard limit of smog release.
The technical scheme is that limekiln denitrating system, including limekiln and denitrating system.Limekiln is provided with preheating
Band, burning zone and cooling zone, denitrating system includes denitrfying agent storage tank, liquid evaporator, surge tank, blender and blower fan, denitration
Agent storage tank passes sequentially through liquid evaporator and surge tank is connected to blender, and blower fan is connected to blender by air pipe line.Calx
Kiln is provided with denitration spray gun, and denitration spray gun is separately mounted to the burning zone in limekiln, exhanst gas outlet and wind porch, mixer outlet
It is connected to denitration spray gun.
Limekiln is sleeve kiln, double thorax kiln or beam type kiln, however not excluded that other type of limekiln.Double thorax kilns, including two
Kiln body, two kiln body bottoms are provided with exhaust gases passes, and exhaust gases passes is provided with gas mixing device, and the top of kiln body is provided with combustion air pipeline,
The bottom of kiln body is provided with cooling duct road.Denitration spray gun is arranged on the burning zone of two kiln body, gas mixing device, combustion air pipeline and cold
But air pipe line.Sleeve kiln is provided with upper combustion chamber, lower combustion chamber, upper inner core and lower inner core, denitration spray gun be arranged on upper combustion chamber, under
Combustor and upper inner core bottom.Surge tank is provided with pressure regulator valve, is provided with valve between blender and each denitration spray gun.
The ammonia that denitrfying agent is mass concentration 20%～25% or mass concentration that denitrfying agent storage tank is total are the carbamide of 30% ~ 50%
Solution.The ammonia density of blender denitrfying agent is 5 ± 1%.
One road ammonia gaseous mixture sprays in kiln thorax by the pipeline of combustion air, and another road ammonia gaseous mixture is by cooling wind
Pipeline sprays in kiln thorax, and ammonia arbitrarily regulates with the ratio of combustion air.Through preheating zone, combustion zone, ammonia with burning after cigarette
Nitrogen oxides generation chemical reaction in gas, generates nitrogen, removes denitrification, thus reach denitration purpose.
The denitration efficiency of SNCR method is 30%～70%, the denitration efficiency 80%～90% less than selective catalytic reduction SCR,
The expense (including cost of equipment and operating cost) of SNCR method is about the 1/5 of SCR method.Liquefied ammonia can by mass concentration 20%～
The urea liquid of 25% ammonia or mass concentration 30% ~ 50% is replaced.
The present invention, by setting up out of stock system in limekiln, utilizes denitrfying agent to spray into kiln thorax and exhaust gases passes, effectively removes
The oxynitride of flue gas during limestone calcination, reduces the amount of nitrogen oxides of limekiln discharge flue gas, and NOx discharge is dense
Degree is reduced to 200mg/Nm3 Below, it is achieved that emission of smoke tallies discharging standards, alleviate atmospheric pollution, be conducive to protecting
Protect natural environment, there is significant social benefit.
Accompanying drawing explanation
Fig. 1 is double-hearth lime kiln denitrating system schematic flow sheet；
Fig. 2 is sleeve-type lime kiln denitrating system schematic flow sheet；
Wherein: 1 valve, 2 denitration spray gun, 3 blenders, 4 surge tanks, 5 liquid evaporators, 6 denitrfying agent storage tanks,
7 air pipe lines, 8 blower fans, 9 gas mixing devices, the 10 pairs of thorax kilns, 11 preheating zones, 12 burning zones, 13 cooling zones,
14 combustion air pipelines, 15 cooling duct roads, 16 denitration pipelines, 17 upper combustion chamber, inner core bottom on 18,19 times
Combustor, 20 sleeve kilns.
Detailed description of the invention
Below in conjunction with embodiment and accompanying drawing, the present invention is described in detail.Scope is not limited to embodiment,
Those skilled in the art make any change in the range of claim limits and fall within the scope of protection of the invention.
Embodiment 1
Limekiln of the present invention denitrating system is as it is shown in figure 1, include double thorax kilns 10 and out of stock system.Double thorax kilns are provided with two kiln body,
Being provided with preheating zone 11, burning zone 12 and cooling zone 13 in kiln body, the bottom of two kiln body is provided with exhaust gases passes, and exhaust gases passes is provided with
Gas mixing device 9.The top of kiln body is provided with combustion air pipeline 14, and the bottom of kiln body is provided with cooling duct road 15.Denitrating system includes
Denitrfying agent storage tank 6, liquid evaporator 5, surge tank 4, blender 3, blower fan 8 and denitration spray gun 2.Denitration spray gun is separately mounted to help
At combustion air pipe line, the kiln body porch of bottom of kiln body, two kiln body burning zones and gas mixing device.Denitrfying agent storage tank passes sequentially through
Liquid evaporator and surge tank are connected to blender, and blower fan is connected to blender by air pipe line 7, and blender is connected to each road and takes off
Nitre spray gun.Denitrfying agent in denitrfying agent storage tank is the liquefied ammonia of mass concentration 23%.Surge tank is provided with pressure regulator valve, blender and denitration
Valve 1 it is provided with between spray gun.In blender 3, the ammonia density of denitrfying agent is 5.5%.
The denitrification process of the double-hearth lime kiln of low-nitrogen oxide discharging is: (1) liquefied ammonia is transported to denitrfying agent storage tank by tank car,
The liquefied ammonia of denitrfying agent storage tank output is evaporated to ammonia in liquid evaporator, and after ammonia is heated to room temperature, delivers to surge tank 4
Standby.(2) the ammonia in surge tank is after pressure regulator valve reduces pressure, and is mixed by blender, in blender with the dilution wind of dilution air
The concentration of ammonia is far below LEL, and general control is about 5%.(3) the mixed denitrfying agent of blender is through denitration pipeline 16 He
Each connecting line is to denitration spray gun 2.Denitrfying agent i.e. ammonia gas mixture sprays in the flue gas of double thorax kiln by denitration spray gun, with flue gas
In nitrogen oxides generation chemical reaction, generate nitrogen and water, remove denitrification, thus reach denitration purpose.According to technique
Requirement, can select four tunnel denitration spray gun to spray into denitrfying agent denitration, i.e. combustion air pipeline 14, cooling duct road 15, burning zone
Spray gun cooling duct road and four tunnel denitration spray gun of exhaust gases passes, it is possible to select wherein a road, two-way or three tunnel denitration spray gun sprays
Enter denitrfying agent and carry out denitration, realize controlling by regulating the valve 1 on each connecting line.
Embodiment 2
Another embodiment of the present invention is as in figure 2 it is shown, include sleeve kiln 20 and out of stock system.Sleeve kiln set by upper combustion chamber 17,
Lower combustion chamber 19, upper inner core and lower inner core, denitration spray gun is arranged on upper combustion chamber, lower combustion chamber and upper inner core bottom 18.Denitration
System includes denitrfying agent storage tank 6, liquid evaporator 5, surge tank 4, blender 3, blower fan 8 and denitration spray gun 2.Denitrfying agent storage tank depends on
Secondary being connected to blender by liquid evaporator and surge tank, blower fan is connected to blender by air pipe line 7, and blender is connected to
Each road denitration spray gun.Denitrfying agent in denitrfying agent storage tank is the liquefied ammonia of mass concentration 22%.Surge tank is provided with pressure regulator valve, blender
And it is provided with valve 1 between denitration spray gun.In blender 3, the ammonia density of denitrfying agent is 4.8%.
According to technological requirement, three tunnel denitration spray gun can be selected to spray into denitrfying agent out of stock, i.e. upper combustion chamber 17, lower combustion chamber
19 and the out of stock spray gun in upper inner core bottom 18 3 tunnel, it is possible to select that wherein a road or the out of stock spray gun of two-way spray into denitrfying agent and take off
Nitre, realizes controlling by regulating the valve 1 on each connecting line.
Claims (7)
1. a limekiln denitrating system, including limekiln and denitrating system, described limekiln is provided with preheating zone (11), burning zone
(12) and cooling zone (13), described denitrating system includes denitrfying agent storage tank (6), liquid evaporator (5), surge tank (4), blender
And blower fan (8) (3), described denitrfying agent storage tank passes sequentially through liquid evaporator and surge tank is connected to blender, and described blower fan leads to
Crossing air pipe line and be connected to blender, it is characterized in that: described limekiln is provided with denitration spray gun (2), described denitration spray gun is respectively mounted
Burning zone, exhanst gas outlet and wind porch in limekiln, described mixer outlet is connected to denitration spray gun.
Limekiln the most according to claim 1 denitrating system, is characterized in that: described limekiln is sleeve kiln (20), double thorax
Kiln (10) or beam type kiln.
Limekiln the most according to claim 2 denitrating system, is characterized in that: described pair of thorax kiln (10), including two kiln body,
Two kiln body bottoms are provided with exhaust gases passes, and described exhaust gases passes is provided with gas mixing device (9), and the top of described kiln body is provided with combustion air
Pipeline (14), the bottom of kiln body is provided with cooling duct road (15)；Described denitration spray gun (2) is arranged on the burning zone of two kiln body
(12), gas mixing device, combustion air pipeline and cooling duct road.
Limekiln the most according to claim 2 denitrating system, is characterized in that: described sleeve kiln be provided with upper combustion chamber (17),
Lower combustion chamber (19), upper inner core and lower inner core, described denitration spray gun is arranged on upper combustion chamber, lower combustion chamber and upper inner core bottom
(18).
Limekiln the most according to claim 1 denitrating system, is characterized in that: described surge tank (4) is provided with pressure regulator valve, described
Valve (1) it is provided with between blender (3) and each denitration spray gun (2).
Limekiln the most according to claim 1 denitrating system, is characterized in that: the total denitrfying agent of described denitrfying agent storage tank is matter
Ammonia or the mass concentration of amount concentration 20%～25% are the urea liquid of 30% ~ 50%.
Limekiln the most according to claim 1 denitrating system, is characterized in that: the ammonia density of described blender (3) denitrfying agent
It is 5 ± 1%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610573463.6A CN106237821A (en) | 2016-07-21 | 2016-07-21 | A kind of limekiln denitrating system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610573463.6A CN106237821A (en) | 2016-07-21 | 2016-07-21 | A kind of limekiln denitrating system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106237821A true CN106237821A (en) | 2016-12-21 |
Family
ID=57613817
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610573463.6A Pending CN106237821A (en) | 2016-07-21 | 2016-07-21 | A kind of limekiln denitrating system |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108201778A (en) * | 2018-02-09 | 2018-06-26 | 石家庄新华能源环保科技股份有限公司 | A kind of limekiln combined denitration system |
| CN109020267A (en) * | 2018-10-17 | 2018-12-18 | 中冶长天国际工程有限责任公司 | A kind of pulverized coal gun device, low NOx lime generation equipment and its control method |
| CN109111132A (en) * | 2018-10-17 | 2019-01-01 | 中冶长天国际工程有限责任公司 | Low NOx cleaning burning type lime production method, apparatus and its control method |
| CN109354420A (en) * | 2018-10-17 | 2019-02-19 | 中冶长天国际工程有限责任公司 | A kind of low NOx cleaning burning type lime production method, apparatus and its control method |
| CN109592915A (en) * | 2017-09-30 | 2019-04-09 | 山东博研粉体技术装备有限公司 | A kind of double thorax kiln ash discharge systems |
| CN110903042A (en) * | 2019-12-17 | 2020-03-24 | 石家庄新华能源环保科技股份有限公司 | Double-hearth lime kiln with denitration equipment |
| CN112791571A (en) * | 2021-01-04 | 2021-05-14 | 河北用邦环保设备科技有限公司 | Online denitration method for double-hearth kiln |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109592915A (en) * | 2017-09-30 | 2019-04-09 | 山东博研粉体技术装备有限公司 | A kind of double thorax kiln ash discharge systems |
| CN109592915B (en) * | 2017-09-30 | 2024-03-01 | 山东博研粉体技术装备有限公司 | Ash discharging system of double-chamber kiln |
| CN108201778A (en) * | 2018-02-09 | 2018-06-26 | 石家庄新华能源环保科技股份有限公司 | A kind of limekiln combined denitration system |
| CN109020267A (en) * | 2018-10-17 | 2018-12-18 | 中冶长天国际工程有限责任公司 | A kind of pulverized coal gun device, low NOx lime generation equipment and its control method |
| CN109111132A (en) * | 2018-10-17 | 2019-01-01 | 中冶长天国际工程有限责任公司 | Low NOx cleaning burning type lime production method, apparatus and its control method |
| CN109354420A (en) * | 2018-10-17 | 2019-02-19 | 中冶长天国际工程有限责任公司 | A kind of low NOx cleaning burning type lime production method, apparatus and its control method |
| CN109020267B (en) * | 2018-10-17 | 2021-10-26 | 中冶长天国际工程有限责任公司 | Pulverized coal spray gun device, low NOx lime production equipment and control method thereof |
| CN110903042A (en) * | 2019-12-17 | 2020-03-24 | 石家庄新华能源环保科技股份有限公司 | Double-hearth lime kiln with denitration equipment |
| CN112791571A (en) * | 2021-01-04 | 2021-05-14 | 河北用邦环保设备科技有限公司 | Online denitration method for double-hearth kiln |
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Application publication date: 20161221 |