CN108176221A - Sintering flue gas heating and denitration equipment and sintering flue gas heating and denitration method - Google Patents
Sintering flue gas heating and denitration equipment and sintering flue gas heating and denitration method Download PDFInfo
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- CN108176221A CN108176221A CN201711460887.2A CN201711460887A CN108176221A CN 108176221 A CN108176221 A CN 108176221A CN 201711460887 A CN201711460887 A CN 201711460887A CN 108176221 A CN108176221 A CN 108176221A
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- Prior art keywords
- flue gas
- denitration
- sintering flue
- sintering
- ammonia
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Links
- 239000003546 flue gas Substances 0.000 title claims abstract description 118
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 110
- 238000005245 sintering Methods 0.000 title claims abstract description 99
- 238000010438 heat treatment Methods 0.000 title claims abstract description 48
- 238000000034 method Methods 0.000 title claims abstract description 34
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 89
- 229910021529 ammonia Inorganic materials 0.000 claims abstract description 45
- 238000006477 desulfuration reaction Methods 0.000 claims abstract description 30
- 239000007789 gas Substances 0.000 claims abstract description 30
- 230000023556 desulfurization Effects 0.000 claims abstract description 26
- 239000000428 dust Substances 0.000 claims abstract description 14
- 238000006555 catalytic reaction Methods 0.000 claims abstract description 12
- 238000002156 mixing Methods 0.000 claims abstract description 8
- 230000003009 desulfurizing effect Effects 0.000 claims description 21
- 239000003054 catalyst Substances 0.000 claims description 19
- 238000002485 combustion reaction Methods 0.000 claims description 16
- 238000006243 chemical reaction Methods 0.000 claims description 9
- 235000019504 cigarettes Nutrition 0.000 claims description 8
- 239000012716 precipitator Substances 0.000 claims description 6
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 5
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims description 4
- 238000010790 dilution Methods 0.000 claims description 4
- 239000012895 dilution Substances 0.000 claims description 4
- 239000002918 waste heat Substances 0.000 abstract description 18
- 238000004064 recycling Methods 0.000 abstract description 4
- 239000002440 industrial waste Substances 0.000 abstract description 2
- 238000001816 cooling Methods 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 12
- 238000005516 engineering process Methods 0.000 description 7
- 238000011084 recovery Methods 0.000 description 7
- 239000000779 smoke Substances 0.000 description 7
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 239000007921 spray Substances 0.000 description 6
- 239000002351 wastewater Substances 0.000 description 6
- 238000005265 energy consumption Methods 0.000 description 5
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 description 5
- 238000005507 spraying Methods 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000003197 catalytic effect Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000005864 Sulphur Substances 0.000 description 1
- 239000000908 ammonium hydroxide Substances 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 210000000481 breast Anatomy 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000006385 ozonation reaction Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000002407 reforming Methods 0.000 description 1
- 230000001172 regenerating effect Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
Classifications
-
- 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
- B01D53/86—Catalytic processes
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D47/00—Separating dispersed particles from gases, air or vapours by liquid as separating agent
-
- 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
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
- B01D53/507—Sulfur oxides by treating the gases with other liquids
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L15/00—Heating of air supplied for combustion
- F23L15/04—Arrangements of recuperators
-
- 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
- F27D17/004—Systems for reclaiming waste heat
-
- 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
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Analytical Chemistry (AREA)
- Biomedical Technology (AREA)
- Health & Medical Sciences (AREA)
- Combustion & Propulsion (AREA)
- Treating Waste Gases (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
A sintering flue gas heating and denitration device and a sintering flue gas heating and denitration method belong to the field of industrial waste gas treatment. The sintering flue gas heating and denitration equipment comprises a denitration tower, and an air inlet flue and an exhaust flue which are connected with the denitration tower, wherein the air inlet flue is connected with an ammonia conveying pipe and a flue combustor, a flue gas-flue gas reheater for heat exchange is connected between the air inlet flue and the exhaust flue, the exhaust flue is connected with a desulfurization tower, and the top of the desulfurization tower is provided with a wet electric dust remover. The device can effectively recycle the waste heat by adopting an energy two-stage recycling method. The sintering flue gas heating denitration method comprises the following steps: heating the sintering flue gas to 300-320 ℃, mixing the sintering flue gas with ammonia gas, and carrying out catalytic reaction to obtain denitrated clean flue gas; and exchanging heat between the denitrated clean flue gas and the sintering flue gas before heating, cooling to 150-160 ℃, and then performing desulfurization and dust removal treatment. The method can adopt an energy two-stage recycling method to recycle the waste heat so as to save energy.
Description
Technical field
The present invention relates to industrial waste gases to administer FIELD OF THE INVENTIONThe, in particular to a kind of sintering flue gas heating denitration device
And sintering flue gas heating method of denitration.
Background technology
The sintering machine of steel plant has very big exhaust smoke level, has very big pollution, the flue gas of sintering machine discharge to environment
In major pollutants be NOX、SO2And dust.Therefore, sintering plant flue gas must carry out flue gas desulfurization and denitrification processing to reduce dirt
Dye.
Since the temperature of sintering flue gas is relatively low, country's sintering machine is not provided with denitrification apparatus generally using wet desulphurization at present,
Easily there is white cigarette in chimney breast, and for environmental requirement, domestic most of sintering plant need to carry out denitration reforming processing.It is domestic at present
Sintering flue gas denitration technology be broadly divided into three kinds：Activated carbon method, SCR denitration and Ozonation denitration.Wherein, activated carbon method
It is desulfurization and denitrification integral technology, is suitble to newly-built sintering device flue gas purification.Oxidizing and denitrating ozone technology is suitable for NOXConcentration is relatively low
Flue gas, higher concentration NOXFlue gas denitration efficiency is difficult to ensure that using oxidizing and denitrating ozone, and operating cost is excessively high.SCR denitration
Technique utilizes catalyst by NO using ammonia as reducing agent in 280~420 DEG C of temperature rangesXIt is reduced to N2, denitration technology is ripe, de-
Nitre is efficient.Since the temperature of sintering flue gas is relatively low, to ensure the normal operation of denitration effect and system, need to sintering flue gas
Heat temperature raising is carried out, the SCR denitration process waste utilization rate of tradition heating is low, and operating cost is also higher, it is impossible to meet existing steel
The demand of factory's energy-saving and emission-reduction.
Therefore, it is necessary to a kind of utilization rate of waste heat that can improve with the sintering flue gas method of denitration and equipment of energy-saving and emission-reduction.
Invention content
The purpose of the present invention is to provide a kind of sintering flue gas heating denitration devices, effectively waste heat can be utilized to carry out
Preheating, and recycle to play energy-efficient and reducing discharge of waste gases effect by the two-stage to waste heat.
Another object of the present invention is to provide a kind of sintering flue gas heating method of denitration, two can be carried out using waste heat
Grade recycles the effect to realize energy-saving and emission-reduction.
What the embodiment of the present invention was realized in：
A kind of sintering flue gas heating method of denitration, includes the following steps：
Sintering flue gas is heated to mix and be passed into denitrating catalyst surface, catalysis reaction after 300~320 DEG C with ammonia
Obtain denitration neat stress；
By denitration neat stress with heating before sintering flue gas heat exchange be cooled to 150~160 DEG C after by desulfurization, dedusting at
Reason obtains discharge flue gas.
It is above-mentioned that denitration neat stress and the sintering flue gas before heating exchange heat in preferred embodiments of the present invention, make burning
Knot flue gas to 250~260 DEG C and makes denitration neat stress be cooled to 160~170 DEG C.
It is above-mentioned to change combustion air with being cooled to 160~170 DEG C of denitration neat stress in preferred embodiments of the present invention
Heat makes combustion air be used to heat sintering flue gas, and denitration neat stress is made to be cooled to 150 after being heated to 130~140 DEG C
~160 DEG C.
In preferred embodiments of the present invention, desulfurization Wet chimney is disappeared into white gas successively with being cooled to 160~170 DEG C of denitration
Neat stress, catalysis denitration neat stress obtained by the reaction heat exchange, make desulfurization Wet chimney disappear white gas be heated to 200~210 DEG C after with it is wet
Formula electric precipitation processing denitration neat stress mixing, and make catalysis denitration neat stress obtained by the reaction be cooled to 290~300 DEG C after with
Sintering flue gas heat exchange before heating.
In preferred embodiments of the present invention, it is above-mentioned ammonia is mixed with other sintering flue gas after be heated to 300~
320 DEG C of sintering flue gas mixes and is passed into catalyst surface.
In preferred embodiments of the present invention, NO in above-mentioned discharge flue gasXContent is in 100mg/Nm3Hereinafter, denitration efficiency exists
More than 90%, SO2Content is in 30mg/Nm3Hereinafter, dust concentration is in 10mg/Nm3Below.
A kind of sintering flue gas heating denitration device, the inlet air stack being connect including denitrating tower and with denitrating tower and exhaust cigarette
Road, inlet air stack are connected with ammonia delivery pipe and for the flue combustor to flowing through flue gas in inlet air stack, air inlet cigarettes
Flue gas-smoke re-heater for heat exchange is connected between road and exhaust uptake, exhaust uptake is connected with desulfurizing tower, desulfurizing tower
Top be equipped with wet electrical dust precipitator.
In preferred embodiments of the present invention, above-mentioned exhaust uptake is equipped with main air preheater, main air preheater
The first air inlet and first row gas port be connected separately with combustion fan and flue combustor.
In preferred embodiments of the present invention, above-mentioned exhaust uptake is additionally provided with secondary air preheater, main air preheating
The second air inlet and second exhaust port of device are connected separately with desulfuration chimney and disappear the air inlet of white gas wind turbine and secondary air preheater
Mouthful, the exhaust outlet of secondary air preheater is connected with the top of desulfurizing tower.
In preferred embodiments of the present invention, above-mentioned ammonia delivery pipe is connected with mixer, and it is dilute that mixer is connected with high temperature
Wind turbine and ammonia evaporator are released, the inlet and outlet of ammonia evaporator is connected separately with ammonia water tank and desulfurizing tower.
The advantageous effect of the embodiment of the present invention is：Sintering flue gas heating denitration device provided in an embodiment of the present invention includes de-
Nitre tower and the inlet air stack and exhaust uptake being connect with denitrating tower, inlet air stack are connected with ammonia delivery pipe and for air inlet cigarettes
The flue combustor of flue gas is flowed through in road, flue gas-flue gas for heat exchange is connected between inlet air stack and exhaust uptake
Reheater, exhaust uptake are connected with desulfurizing tower, and the top of desulfurizing tower is equipped with wet electrical dust precipitator.Sintering flue gas heating denitration is set
It is standby effectively to be preheated using waste heat, and multiple different temperatures area carries out waste heat using two-stage waste-heat recovery device
Between heat exchange, so as to carry out recycling repeatedly stage by stage to the energy that contains in the high temperature denitration flue gas of discharge and efficiently utilize,
So as to play the effect of energy-saving and emission-reduction.Sintering flue gas heating method of denitration includes the following steps：Sintering flue gas is heated to 300~
It is mixed after 320 DEG C with ammonia and is passed into denitrating catalyst surface, denitration neat stress is obtained by the reaction in catalysis；By denitration neat stress with
Sintering flue gas heat exchange before heating obtains discharging flue gas by desulfurization, dust removal process after being cooled to 150~160 DEG C.The sintering
Flue gas heating method of denitration can use two-stage energy recovery repeatedly to recycle the energy in denitration flue gas stage by stage, so as to effective
The recovery utilization rate of waste heat is improved, to realize the effect of energy-saving and emission-reduction.
Description of the drawings
It in order to illustrate the technical solution of the embodiments of the present invention more clearly, below will be to needed in the embodiment attached
Figure is briefly described, it should be understood that the following drawings illustrates only certain embodiments of the present invention, therefore is not construed as pair
The restriction of range, for those of ordinary skill in the art, without creative efforts, can also be according to this
A little attached drawings obtain other relevant attached drawings.
Fig. 1 is the structure diagram of sintering flue gas heating denitration device that the embodiment of the present invention 1 provides；
Fig. 2 is the structure diagram of ammonia-spraying grid in the present invention；
Fig. 3 is the structure diagram of the first pressure reductor in the present invention；
Fig. 4 is the structure diagram of sintering flue gas heating denitrating system that the embodiment of the present invention 2 provides.
In figure：001- sintering flue gases heating denitration device；100- denitrating towers；101- denitrating catalysts；110- inlet air stacks；
120- exhaust uptakes；130- ammonia delivery pipes；140- flue combustors；150- flue gases-smoke re-heater；160- desulfurizing towers；
170- wet electrical dust precipitators；180- main air preheaters；190- combustion fans；200- secondary air preheaters；210- desulfurization
Chimney disappears white gas wind turbine；220- mixers；230- high temperature dilution wind turbines；240- ammonia evaporators；250- ammonia water tanks；260- sprays ammonia
Grid；261- sprays ammonia pipe；262- spray ammonia hole；270- waste water tanks；The first pressure reductors of 280-；The second pressure reductors of 290-；300- thirds
Pressure reductor.
Specific embodiment
Purpose, technical scheme and advantage to make the embodiment of the present invention are clearer, below in conjunction with the embodiment of the present invention
In attached drawing, the technical solution in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is
Part of the embodiment of the present invention, instead of all the embodiments.The present invention being usually described and illustrated herein in the accompanying drawings is implemented
The component of example can be configured to arrange and design with a variety of different.
Therefore, below the detailed description of the embodiment of the present invention to providing in the accompanying drawings be not intended to limit it is claimed
The scope of the present invention, but be merely representative of the present invention selected embodiment.Based on the embodiments of the present invention, this field is common
Technical staff's all other embodiments obtained without creative efforts belong to the model that the present invention protects
It encloses.
It should be noted that：Similar label and letter represents similar terms in following attached drawing, therefore, once a certain Xiang Yi
It is defined in a attached drawing, does not then need to that it is further defined and explained in subsequent attached drawing.
In the description of the present invention, it should be noted that term " " center ", " on ", " under ", "left", "right", " vertical ",
The orientation or position relationship of the instructions such as " level ", " interior ", " outer " are based on orientation shown in the drawings or position relationship or are somebody's turn to do
Invention product using when the orientation usually put or position relationship, be for only for ease of the description present invention and simplify description, without
It is instruction or implies that signified device or element there must be specific orientation, with specific azimuth configuration and operation, therefore not
It is understood that as limitation of the present invention.In addition, term " first ", " second ", " third " etc. are only used for distinguishing description, and cannot manage
It solves to indicate or implying relative importance.
In addition, the terms such as term " level ", " vertical ", " pendency " are not offered as requiring component abswolute level or pendency, and
It is that can be slightly tilted.It is not to represent the structure if " level " only refers to that its direction is more horizontal with respect to for " vertical "
It has to fully horizontally, but can be slightly tilted.
In the description of the present invention, it is also necessary to which explanation is unless specifically defined or limited otherwise, term " setting ",
" installation ", " connected ", " connection " should be interpreted broadly, for example, it may be being fixedly connected or being detachably connected or one
Connect to body；Can be mechanical connection or electrical connection；It can be directly connected, it can also be indirect by intermediary
It is connected, can is the connection inside two elements.For the ordinary skill in the art, on being understood with concrete condition
State the concrete meaning of term in the present invention.
In the present invention unless specifically defined or limited otherwise, fisrt feature second feature it " on " or it " under "
It can be in direct contact including the first and second features, it is not to be in direct contact but pass through it that can also include the first and second features
Between other characterisation contact.Moreover, fisrt feature second feature " on ", " top " and " above " including first spy
Sign is right over second feature and oblique upper or is merely representative of fisrt feature level height higher than second feature.Fisrt feature exists
Second feature " under ", " lower section " and " following " immediately below second feature and obliquely downward or be merely representative of including fisrt feature
Fisrt feature level height is less than second feature.
Embodiment 1
It please referring to shown in Fig. 1, Fig. 2 and Fig. 3, the embodiment of the present invention provides a kind of sintering flue gas heating denitration device 001,
Including the interior denitrating tower 100 for being equipped with three layers of denitrating catalyst 101 and the inlet air stack 110 being connect with denitrating tower 100 and exhaust cigarette
Road 120, inlet air stack 110 are connected with ammonia delivery pipe 130 and for being fired to the flue that flue gas is flowed through in inlet air stack 110
Burner 140 is connected with flue gas-smoke re-heater 150 for heat exchange between inlet air stack 110 and exhaust uptake 120, exhaust
Flue 120 is connected with desulfurizing tower 160, and the top of desulfurizing tower 160 is equipped with wet electrical dust precipitator 170.
Sintering flue gas heating denitration device 001 provided in an embodiment of the present invention can be effectively utilized except the discharge of nitre processing
The waste heat of flue gas, thus it is effective energy saving, play the effect of energy-saving and emission-reduction.The sintering flue gas of sintering plant discharge passes through air inlet
Flue 110 enter denitrating tower 100 after, suitable temperature is heated to by flue combustor 140 first, then with ammonia delivery pipe
101 surface of denitrating catalyst is passed into after the ammonia mixing of 130 conveyings and carries out catalysis reaction removing nitrogen oxides, subsequent high temperature
When denitration neat stress is discharged by exhaust uptake 120, pass through the flue gas-cigarette being connect with inlet air stack 110 and exhaust uptake 120
Gas reheater 150 (i.e. GGH heat exchangers) is by the denitration neat stress for the high temperature discharged by exhaust uptake 120 and passes through inlet air stack
110 sintering flue gases being passed through carry out the heat exchange processing of first stage, tentatively recycle the heat of denitration neat stress to heat into de-
The sintering flue gas of the low temperature of nitre tower 100 so as to reduce the energy consumption of flue combustor 140, and effectively recycles the net cigarette of denitration
The heat contained in gas plays energy saving effect, then cools down heat exchange to save the energy of the consumption of flue combustor 140
Denitration neat stress afterwards is passed through in desulfurizing tower 160 wet electrical dust precipitator 170 set after desulfurization process by 160 tower top of desulfurizing tower
It is discharged after being dusted processing by the chimney at 160 top of desulfurizing tower, obtains the discharge flue gas for meeting discharge standard, reduce to ring
The pollution in border simultaneously reduces processing energy consumption.
Exhaust uptake 120 is equipped with main air preheater 180, the first air inlet of main air preheater 180 and first
Exhaust outlet is connected separately with combustion fan 190 and flue combustor 140.The main air preheater set on exhaust uptake 120
180 can use the denitration neat stress of the high temperature of discharge and the combustion air that combustion fan 190 is passed through to carry out heat exchange processing, make to add
Combustion air after heat is passed into flue combustor 140 and is heated, so as to reduce the heating energy consumption of flue combustor 140.
Exhaust uptake 120 is additionally provided with secondary air preheater 200, the second air inlet of main air preheater 180 and
Two exhaust outlets are connected separately with desulfuration chimney and disappear the air inlet of white gas wind turbine 210 and secondary air preheater 200, and secondary air is pre-
The exhaust outlet of hot device 200 is connected with the top of desulfurizing tower 160.The main air preheater 180 and two set on exhaust uptake 120
Grade air preheater 200 can be passed through using the denitration neat stress of the high temperature of discharge and the desulfuration chimney white gas wind turbine 210 that disappears successively
Cold air carry out heat exchange processing, disappeared using the denitration neat stress of two sections of different temperatures of the discharge desulfurization Wet chimney low to temperature
White gas is heated to obtain the high desulfurization Wet chimney of temperature and is disappeared white gas, and by the desulfurization Wet chimney after heating disappear white gas be passed into it is de-
In the top chimney of sulphur tower 160, the temperature for improving discharge flue gas disappear white, while reduces denitration neat stress and enters desulfurizing tower
160 temperature in order to carry out desulfurization process and and recovery waste heat, realize the effects of energy-saving and emission-reduction.
Ammonia delivery pipe 130 is connected with mixer 220, and mixer 220 is connected with high temperature dilution wind turbine 230 and ammonia evaporation
Device 240, the import of ammonia evaporator 240 are connected with ammonia water tank 250, and the outlet of ammonia evaporator 240 is connected with waste water tank 270,
Waste water tank 270 is connected with desulfurizing tower 160 by pipeline.The sintering flue gas for being passed through high temperature dilution wind turbine 230 using mixer 220
It is passed through in inlet air stack 110 after being mixed with ammonia prepared by ammonia evaporator 240 and mixes laggard one with the sintering flue gas after heating
Step carries out catalytic denitration processing, can effectively improve ammonia and the mixing uniformity of sintering flue gas, improves denitration effect, ammonia
240 evaporation of gas evaporator, which prepares the waste water after ammonia and is passed into waste water tank 270, to be stored, and pass through pipeline and be passed into desulfurization
The ammonia process of desulfurization is carried out in tower 160, so as to adequately using ammonium hydroxide waste liquid, realize the zero-emission of waste water, realize energy-saving and emission-reduction.
Ammonia delivery pipe 130 extend into inlet air stack 110 and is connected with ammonia-spraying grid 260, and ammonia-spraying grid 260 is by more
The hollow connection composition of spray ammonia pipe 261, every spray ammonia pipe 261 offer multiple spray ammonia holes 262.By being set to inlet air stack
Ammonia can be uniformly ejected into inlet air stack 110, and with sintering flue gas after mixing by the ammonia-spraying grid 260 in 110
The surface-catalyzed reactions for being passed through denitrating catalyst 101 handled except nitre, so as to remove the nitrogen in sintering flue gas to the greatest extent
Oxide.
It is also equipped with offering the first pressure reductor 280 of eight vents, first pressure reductor 280 in denitrating tower 100
Between denitrating catalyst 101 and inlet air stack 110.It is equipped in denitrating tower 100 and is located at denitrating catalyst 101 and inlet air stack
The first pressure reductor 280 between 110 can reduce by inlet air stack 110 and pass through the sintering flue gas of denitrating catalyst 101
Flow velocity, the sintering flue gas for being mixed with ammonia is made adequately to contact denitrating catalyst 101 and is reacted to remove denitrification.
It is also equipped with offering the second pressure reductor 290 of eight vents, the second pressure reductor 290 in inlet air stack 110
Between flue combustor 140 and ammonia delivery pipe 130.Second between flue combustor 140 and ammonia delivery pipe 130
Pressure reductor 290 can reduce the flow velocity of the sintering flue gas by inlet air stack 110, and sintering flue gas is made adequately to be heated.
Inlet air stack 110, denitrating tower 100 and the connection of exhaust uptake 120 form shape of chinese word Ji.Inlet air stack 110, denitrating tower
100 and exhaust uptake 120 be arranged to shape of chinese word Ji can facilitate installation inlet air stack 110 and exhaust uptake 120 between connect it is useful
Heat exchange operation is carried out in flue gas-smoke re-heater 150 of heat exchange, and is reduced remaining during the heat exchange of the two-stage energy recycles
Heat loss improves utilization rate of waste heat with energy saving.
Embodiment 2
It please referring to shown in Fig. 2, Fig. 3 and Fig. 4, the embodiment of the present invention additionally provides a kind of sintering flue gas heating denitrating system,
It includes above-mentioned sintering flue gas heating denitration device 001, is equipped between adjacent denitrating catalyst 101 and offers eight and subtract
The third pressure reductor 300 in hole is pressed, third pressure reductor 300 can reduce the flow velocity of the sintering flue gas by denitrating catalyst 101, make
The sintering flue gas for being mixed with ammonia adequately contacts denitrating catalyst 101 and is reacted to remove denitrification.
First pressure reductor 280, the second pressure reductor 290 are similar with the structure of third pressure reductor 300, and only size differs.
Embodiment 3
It please refers to shown in Fig. 1, Fig. 2 and Fig. 3, the embodiment of the present invention provides a kind of sintering flue gas heating method of denitration, is
What the sintering flue gas heating denitration device 001 provided using above-described embodiment 1 was realized, it mainly includes the following steps that：
By sintering flue gas by inlet air stack 110 and passing sequentially through 150 heat exchange of flue gas-smoke re-heater to 250
~260 DEG C, using flue combustor 140 be heated to 300~320 DEG C, the sintering flue gas and ammonia being then passed through with mixer 220
Mixed gas mix and be passed into 101 surface of denitrating catalyst, catalysis denitration neat stress is obtained by the reaction；
Denitration neat stress is passed sequentially through to the heat exchange of secondary air preheater 200 set on exhaust uptake 120 and is cooled to 290
~300 DEG C, by the heat exchange of flue gas-smoke re-heater 150 be cooled to 160~170 DEG C, exchanged heat by main air preheater 180
Desulfurization is carried out by desulfurizing tower 160, dust removal process obtains discharge flue gas after being cooled to 150~160 DEG C.
Combustion air is passed through main air preheater 180 and 160~170 DEG C of denitration neat stress exchanges heat, makes combustion-supporting sky
Gas is passed into flue combustor 140 to heat sintering flue gas after being heated to 130~140 DEG C.
By desulfurization Wet chimney disappear white gas be passed into successively in main air preheater 180 and secondary air preheater 200 with
The denitration neat stress of different temperatures section, catalysis denitration neat stress heat exchange obtained by the reaction make the desulfurization Wet chimney white gas that disappears add successively
160 top chimney of desulfurizing tower and the denitration neat stress of wet-esp processing are passed through after heat to 120~130 DEG C and 200~210 DEG C
Mixing.The desulfurization Wet chimney disappears white gas as air.
By being set to inlet air stack after ammonia is mixed with the sintering flue gas of other higher temperature using mixer 220
In 110 ammonia-spraying grid 260 be heated to 300~320 DEG C of sintering flue gas mix and be passed into 101 surface of denitrating catalyst into
The processing of row catalytic denitration.
Sintering flue gas heating method of denitration provided in an embodiment of the present invention can be improved effectively to waste heat from tail gas in technique
Utilization, and maximumlly remove tail gas in amount of nitrogen oxides, so as to fulfill the effect of energy-saving and emission-reduction.During the present invention selects
Warm SCR denitration technique, first with the waste heat recovery profit of GGH heat exchangers treated to removing nitre denitration neat stress the carries out first order
With exchanging heat to former sintering flue gas, former sintering flue gas is made to be heated to 260 DEG C or so, then pass through combustion heating to 310
DEG C or so handled except nitre, since the heat of combustion heating consumption accounts for the total amount of heat consumption of direct combustion heating process
28%, therefore a large amount of energy consumption can be saved to reduce operating cost；Simultaneously using GGH heat exchangers and two-stage air preheater two
Neat stress waste heat carries out the heat recovery of the second level after grade recycling denitration, using denitration neat stress to combustion air and desulfurization
The Wet chimney white gas that disappears exchanges heat to carry out waste heat recovery, and the temperature of denitration neat stress can be reduced to 160 DEG C from 310 DEG C, remaining
Heat utilization efficiency is 83%, and will heat up SCR denitration technology and be combined with the desulfurization Wet chimney white technology that disappears, and effectively solves existing adopt
Disappeared white problem with the sintering flue gas denitration transformation of wet desulphurization and Wet chimney, by rationally designing system optimization using energy source, greatly
Big has saved energy consumption and has reduced cost.
It is practical using above-mentioned sintering flue gas heating method of denitration and sintering flue gas heating denitration device at sintering plant scene
After be detected it is found that sintering plant discharge flue gas in NOXContent in 100mg/Nm3Hereinafter, denitration efficiency is more than 90%, SO2
Content is in 30mg/Nm3Hereinafter, dust concentration is in 10mg/Nm3Hereinafter, fully meeting and greatly less than the sintering tail gas row of country
Put standard.
Sintering flue gas heating denitrification apparatus provided in an embodiment of the present invention and sintering flue gas heating method of denitration can will be arranged
The two-stage that the waste heat that the high temperature denitration flue gas gone out contains carries out the energy recycles, so as to effectively be contained using denitration flue gas
Energy, and these energy regeneratings are played into the effect of energy-saving and emission-reduction to improve energy utilization rate.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, that is made any repaiies
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (10)
- The method of denitration 1. a kind of sintering flue gas heats up, which is characterized in that it includes the following steps：Sintering flue gas is heated to mix and be passed into denitrating catalyst surface after 300~320 DEG C with ammonia, catalysis is obtained by the reaction Denitration neat stress；By the denitration neat stress with heating before sintering flue gas heat exchange be cooled to 150~160 DEG C after by desulfurization, dedusting at Reason obtains discharge flue gas.
- The method of denitration 2. sintering flue gas according to claim 1 heats up, which is characterized in that by the denitration neat stress with adding Sintering flue gas heat exchange before heat, makes the sintering flue gas be heated to 250~260 DEG C and is cooled to the denitration neat stress 160~170 DEG C.
- The method of denitration 3. sintering flue gas according to claim 2 heats up, which is characterized in that by combustion air with being cooled to 160~170 DEG C of denitration neat stress heat exchange makes the combustion air be used to carry out sintering flue gas after being heated to 130~140 DEG C Heating, and the denitration neat stress is made to be cooled to 150~160 DEG C.
- The method of denitration 4. sintering flue gas according to claim 2 heats up, which is characterized in that by desulfurization Wet chimney disappear white gas according to Secondary denitration neat stress, catalysis denitration neat stress obtained by the reaction with being cooled to 160~170 DEG C exchanges heat, and makes the wet cigarette of the desulfurization The chimney white gas that disappears is heated to mixing with the denitration neat stress that wet-esp is handled after 200~210 DEG C, and reacts the catalysis To denitration neat stress be cooled to after 290~300 DEG C and sintering flue gas before heating exchanges heat.
- The method of denitration 5. sintering flue gas according to claim 1 heats up, which is characterized in that by ammonia and other sintering cigarette It mixes with being heated to 300~320 DEG C of sintering flue gas after gas mixing and is passed into catalyst surface.
- The method of denitration 6. sintering flue gas according to claim 1 heats up, which is characterized in that NO in the discharge flue gasXContent In 100mg/Nm3Hereinafter, denitration efficiency is more than 90%, SO2Content is in 30mg/Nm3Hereinafter, dust concentration is in 10mg/Nm3With Under.
- The denitration device 7. a kind of sintering flue gas heats up, which is characterized in that it include denitrating tower and connect with the denitrating tower into Gas flue and exhaust uptake, the inlet air stack are connected with ammonia delivery pipe and for adding to flowing through flue gas in the inlet air stack The flue combustor of heat, is connected with flue gas-flue gas reheat for heat exchange between the inlet air stack and the exhaust uptake Device, the exhaust uptake are connected with desulfurizing tower, and the top of the desulfurizing tower is equipped with wet electrical dust precipitator.
- The denitration device 8. sintering flue gas according to claim 7 heats up, which is characterized in that the exhaust uptake is equipped with level-one Air preheater, the first air inlet and first row gas port of the main air preheater are connected separately with combustion fan and described Flue combustor.
- The denitration device 9. sintering flue gas according to claim 8 heats up, which is characterized in that the exhaust uptake is additionally provided with two Grade air preheater, the second air inlet and second exhaust port of the main air preheater be connected separately with desulfuration chimney disappear it is white The air inlet of gas wind turbine and the secondary air preheater, the exhaust outlet of the secondary air preheater and the top of the desulfurizing tower Portion connects.
- The denitration device 10. sintering flue gas according to claim 9 heats up, which is characterized in that the ammonia delivery pipe connection There is mixer, the mixer is connected with high temperature dilution wind turbine and ammonia evaporator, the inlet and outlet of the ammonia evaporator It is connected separately with ammonia water tank and the desulfurizing tower.
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