CN111544971A - Gas low-nitrogen low-dust combustion purification method and system - Google Patents
Gas low-nitrogen low-dust combustion purification method and system Download PDFInfo
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- CN111544971A CN111544971A CN202010368110.9A CN202010368110A CN111544971A CN 111544971 A CN111544971 A CN 111544971A CN 202010368110 A CN202010368110 A CN 202010368110A CN 111544971 A CN111544971 A CN 111544971A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/02—Particle separators, e.g. dust precipitators, having hollow filters made of flexible material
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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
- B01D53/78—Liquid phase processes with gas-liquid contact
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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
- B01D53/86—Catalytic processes
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
- B01D53/8628—Processes characterised by a specific catalyst
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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
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
- F23J15/022—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material for removing solid particulate material from the gasflow
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/20—Reductants
- B01D2251/206—Ammonium compounds
- B01D2251/2062—Ammonia
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- 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
Abstract
The invention provides a fuel gas low-nitrogen low-dust combustion purification scheme, which comprises a fuel gas low-nitrogen low-dust combustion purification method and a fuel gas low-nitrogen low-dust combustion purification system, wherein the scheme is integrated by adopting a low-nitrogen combustion technology and a cloth bag dust removal and denitration integrated technology, namely, the fuel gas is firstly combusted by adopting the low-nitrogen combustion technology to preliminarily reduce the content of nitrogen oxides in flue gas, then the flue gas is subjected to denitration treatment by adopting the cloth bag dust removal and denitration integrated technology after heat exchange and desulfurization treatment, and dust in the flue gas is removed at the same time, so that the fuel gas low-nitrogen low-dust combustion purification effect is realized. Because the gas is combusted by adopting a low-nitrogen combustion technology, the content of nitrogen oxides in the discharged flue gas is greatly reduced, the subsequent denitration load is reduced, then the bag-type dust removal and denitration integrated device is used for removing dust and denitration, the dust and denitration can be simultaneously carried out in one set of device, the required devices and equipment are reduced, the equipment investment is reduced, and the flue gas purification cost is effectively reduced.
Description
Technical Field
The invention belongs to the field of gas combustion purification, and relates to a gas low-nitrogen low-dust combustion purification method and system for removing nitrogen oxides and multiple pollutants in a gas combustion-mineral roasting system.
Background
In the mineral roasting industry such as cement, metallurgy, dolomite, magnesite and the like, a large amount of blast furnace gas, gasification gas, coke oven gas and natural gas are consumed as fuels, when the fuels are combusted, the flue gas after combustion contains a large amount of nitrogen oxides due to the conversion of nitrogen-containing elements in the fuels or thermal conversion, and simultaneously, the generated high-temperature flue gas can carry a large amount of mineral dust during heat exchange with minerals, and the dust can cause particulate pollution.
Therefore, the research on how to effectively carry out low-nitrogen low-dust combustion of fuel gas at low cost has very important practical significance for the mineral roasting industry.
Disclosure of Invention
The invention aims to provide a gas low-nitrogen low-dust combustion purification method and a gas low-nitrogen low-dust combustion purification system for removing nitrogen oxides and multiple pollutants in a gas combustion-mineral roasting system.
In order to achieve the purpose, the invention adopts the following technical scheme:
on one hand, the invention provides a low-nitrogen low-dust combustion purification method for fuel gas, which is integrated with a cloth bag dust removal and denitration integrated technology, namely, the fuel gas is firstly combusted by the low-nitrogen combustion technology to preliminarily reduce the content of nitrogen oxides in the flue gas, then the flue gas is subjected to denitration treatment by the cloth bag dust removal and denitration integrated technology after heat exchange and desulfurization treatment, and dust in the flue gas is removed at the same time, so that the low-nitrogen low-dust combustion purification effect of the fuel gas is realized. Because the gas is combusted by adopting a low-nitrogen combustion technology, the content of nitrogen oxides in the discharged flue gas is greatly reduced, the subsequent denitration load is reduced, then the bag-type dust removal and denitration integrated device is used for removing dust and denitration, the dust and denitration can be simultaneously carried out in one set of device, the required devices and equipment are reduced, the equipment investment is reduced, and the flue gas purification cost is effectively reduced. The method comprises the following steps:
s1, feeding fuel gas and air into low-nitrogen combustion equipment in a certain proportion for low-nitrogen combustion to generate high-temperature flue gas, and discharging the high-temperature flue gas from the low-nitrogen combustion equipment;
s2, high-temperature flue gas discharged from the low-nitrogen combustion equipment enters mineral heating and roasting equipment, heat contained in the high-temperature flue gas is used for roasting minerals, the roasted mineral products enter a mineral roasting product storage and utilization system after being discharged from the mineral heating and roasting equipment, and the high-temperature flue gas after heat is released is changed into medium-temperature flue gas and is discharged from the mineral heating and roasting equipment;
s3, allowing the medium-temperature flue gas discharged from the mineral heating and roasting equipment to enter flue gas heat exchange equipment, exchanging heat with low-temperature desulfurized flue gas to change the medium-temperature flue gas into low-temperature flue gas, heating the low-temperature desulfurized flue gas into the medium-temperature and low-temperature desulfurized flue gas, and discharging the medium-temperature and low-temperature desulfurized flue gas from the flue gas heat exchange equipment after exchanging heat;
s4, feeding the medium-low temperature flue gas discharged from the flue gas heat exchange equipment into dry desulfurization equipment, reacting with a desulfurizer to carry out desulfurization, changing the desulfurized medium-low temperature flue gas into low-temperature desulfurized flue gas, discharging the low-temperature desulfurized flue gas from the dry desulfurization equipment, feeding the low-temperature desulfurized flue gas into flue gas heat exchange equipment, and exchanging heat with medium-temperature flue gas to form medium-low temperature desulfurized flue gas;
s5, feeding the medium-low temperature desulfurized flue gas discharged from the flue gas heat exchange equipment into cloth bag dedusting and denitration integrated equipment, reacting with ammonia water for denitration, dedusting, removing dust and discharging, wherein the discharged dust meets the discharge standard after being treated and is directly discharged, or is recycled as raw materials such as building materials, and the medium-low temperature desulfurized flue gas is changed into low-temperature desulfurized and denitrated low-dust flue gas after being dedusted and denitrated and is discharged from the cloth bag dedusting and denitration integrated equipment;
s6, enabling the low-temperature desulfurization and denitrification low-dust flue gas discharged from the cloth bag dust removal and denitrification integrated equipment to enter smoke discharging equipment, and treating the low-temperature desulfurization and denitrification low-dust flue gas into standard clean flue gas to be discharged.
Preferably, the low-nitrogen combustion mode in step S1 is that the amount of the primary introduced air is less than the theoretical air amount required for complete combustion of the gas, so that the injected gas is combusted in an oxygen-deficient state, the gas after oxygen-deficient combustion moves upwards along the furnace and is mixed with the air for reburning at the air inlet for reburning, and simultaneously, the incompletely combusted components in the gas are completely combusted.
Preferably, the low-nitrogen combustion mode in step S1 includes circulating a portion of the discharged high-temperature flue gas back into the furnace through the flue gas inlet circulation port.
In another aspect, the present invention provides a low-nitrogen low-dust combustion purification system for fuel gas, comprising: low-nitrogen combustion equipment, mineral heating and roasting equipment, flue gas heat exchange equipment, dry desulfurization equipment, cloth bag dust removal and denitration integrated equipment and smoke exhaust equipment;
the low-nitrogen combustion equipment is mainly used for gas low-nitrogen combustion and is provided with a gas inlet, an air inlet and a first smoke outlet, wherein the gas inlet is connected with a gas supply system, the air inlet is connected with the air supply system, and the first smoke outlet is connected with a second smoke inlet of the mineral heating and roasting equipment;
the mineral heating roasting equipment is mainly used for releasing the heat of flue gas for roasting minerals and is provided with a second flue gas inlet, a mineral roasted product outlet and a second flue gas outlet, wherein the second flue gas inlet is connected with the first flue gas outlet of the low-nitrogen combustion equipment, the mineral roasted product outlet is connected with a mineral roasted product storage and utilization system, and the second flue gas outlet is connected with a high-temperature flue gas inlet of the flue gas heat exchange equipment;
the flue gas heat exchange equipment is mainly used for further exchanging heat for medium-temperature flue gas generated after heat is released so as to recover heat of the medium-temperature flue gas, heating the low-temperature desulfurized flue gas after being desulfurized into medium-temperature and low-temperature desulfurized flue gas so as to enable the medium-temperature and low-temperature desulfurized flue gas to reach the temperature required by denitration, and is provided with a high-temperature flue gas inlet, a low-temperature flue gas inlet, a high-temperature flue gas outlet and a low-temperature flue gas outlet, wherein the high-temperature flue gas inlet is connected with a second flue gas outlet of the mineral heating and roasting equipment, the low-temperature flue gas inlet is connected with a third flue gas outlet of the dry-method desulfurization equipment, the high-temperature flue gas outlet is connected with a third flue gas inlet of the dry;
the dry desulfurization equipment is mainly used for removing sulfides in the flue gas so as to enable the content of the sulfides in the flue gas to reach the emission standard and eliminate the influence of the sulfides on flue gas denitration, and is provided with a third flue gas inlet, a desulfurizer inlet and a third flue gas outlet, wherein the third flue gas inlet is connected with a high-temperature flue gas outlet of flue gas heat exchange equipment, the desulfurizer inlet is connected with a desulfurizer supply system, and the third flue gas outlet is connected with a low-temperature flue gas inlet of the flue gas heat exchange equipment;
the cloth bag dust removal and denitration integrated equipment is mainly used for removing dust and denitration of flue gas to enable the content of dust and the content of nitrogen oxides in the flue gas to reach the emission standard, and is provided with a fourth flue gas inlet, an ammonia inlet, a fourth flue gas outlet and a dust outlet, wherein the fourth flue gas inlet is connected with a low-temperature flue gas outlet of flue gas heat exchange equipment, the ammonia inlet is connected with an ammonia water supply system, the fourth flue gas outlet is connected with a fifth flue gas inlet of smoke exhaust equipment, and the dust outlet is connected with a dust collection and treatment system;
the fume extractor is mainly used for discharging and processing clean fume reaching the standard, and is provided with a fifth fume inlet and a fifth fume outlet, wherein the fifth fume inlet is connected with a fourth fume outlet of the cloth bag dedusting and denitration integrated equipment, and the fifth fume outlet is connected with the atmospheric environment.
Preferably, the low-nitrogen combustion device is provided with an air inlet and reburning port.
Preferably, the low-nitrogen combustion device is provided with a smoke inlet circulating air port for partially circulating the high-temperature smoke back to the hearth.
Preferably, the filter bag of the cloth bag dust removal and denitration integrated equipment is coated with a denitration catalyst, and has the functions of dust removal and denitration.
Compared with the prior art, the invention has the following beneficial results:
(1) the invention adopts the low-nitrogen combustion technology, greatly reduces the initial content of nitrogen oxides in the flue gas generated by gas combustion, reduces the subsequent denitration load, and ensures that the subsequent denitration treatment can adopt the denitration technologies with simpler technologies, lower equipment investment cost and lower operation cost, such as cloth bag dust removal and denitration integrated equipment, and the like;
(2) adopt cheap sack dust removal denitration integration equipment as dust removal denitration equipment to make the two integration of dust removal denitration in an equipment, avoided adopting expensive SCR denitration equipment, and need not provide a set of special dust collecting equipment again, equipment quantity reduces, and equipment investment reduces, has effectively reduced flue gas denitration cost.
Drawings
FIG. 1 is a process flow diagram of a low-nitrogen low-dust combustion purification method of fuel gas of the invention;
FIG. 2 is a schematic view of a low-nitrogen low-dust combustion purification system for fuel gas of the present invention;
FIG. 3 is a schematic view of a low-nitrogen combustion apparatus according to embodiment 1 of the present invention;
FIG. 4 is a schematic view of a cloth bag dust removal and denitration integrated device in embodiment 1 and embodiment 2 of the invention;
FIG. 5 is a schematic view of a low-nitrogen combustion apparatus according to embodiment 2 of the present invention.
Reference numerals:
1: a low-nitrogen combustion device; 1-1: an air inlet; 1-2: an air inlet; 1-3: a first smoke outlet; 1-4: a burner; 1-5: an air inlet and reburning port; 1-6: a low-nitrogen combustion equipment hearth; 1-7: an inlet circulation flue gas port; 2: mineral heating and roasting equipment; 2-1: a second flue gas inlet; 2-2: a product outlet for ore removal and roasting; 2-3: a second smoke outlet; 3: flue gas heat exchange equipment; 3-1: a high temperature flue gas inlet; 3-2: a low temperature flue gas inlet; 3-3: a high-temperature smoke outlet; 3-4: a low-temperature smoke outlet; 4: a dry desulfurization unit; 4-1: a third inlet for flue gas; 4-2: desulfurizer inlet, 4-3: a third smoke outlet; 5: cloth bag dust removal and denitration integrated equipment; 5-1: a fourth flue gas inlet; 5-2: ammonia inlet, 5-3: fourth outlet flue gas port, 5-4: a dust outlet; 5-5: a filter bag coated with a denitration catalyst; 6: fume extractor, 6-1: fifth flue gas inlet, 6-2: a fifth smoke outlet.
Detailed Description
The technical solutions of the present invention are further described below by referring to the drawings and the following examples, which are only used to more clearly illustrate the technical solutions of the present invention and should not be taken as limiting the scope of the present invention. .
Example 1
The present example describes the patent in detail with a low-nitrogen combustion apparatus using blast furnace gas as fuel gas and staged combustion as a specific example.
The technical scheme of the embodiment is shown in fig. 1, 2, 3 and 4, and the seed gas low-nitrogen low-dust combustion purification system used in the embodiment mainly comprises low-nitrogen combustion equipment 1, mineral heating and roasting equipment 2, flue gas heat exchange equipment 3, dry desulfurization equipment 4, cloth bag dust removal and denitration integrated equipment 5, smoke exhaust equipment 6 and the like.
The low-nitrogen combustion equipment 1 is mainly used for gas low-nitrogen combustion, a gas inlet 1-1 and a re-combustion air inlet 1-5 of the low-nitrogen combustion equipment are connected with a gas supply system, an air inlet 1-2 of the low-nitrogen combustion equipment is connected with the air supply system, and a first smoke outlet 1-3 of the low-nitrogen combustion equipment is connected with a second smoke inlet 2-1 of mineral heating and roasting equipment 2.
The mineral heating roasting equipment 2 is mainly used for releasing heat of flue gas so as to utilize heat generated by gas combustion for roasting minerals, a second flue gas inlet 2-1 is connected with a first flue gas outlet 1-3 of the low-nitrogen combustion equipment 1, a mineral roasting product outlet 2-2 is connected with a mineral roasting product storage and utilization system, and a second flue gas outlet 2-3 is connected with a high-temperature flue gas inlet 3-1 of the flue gas heat exchange equipment 3.
The flue gas heat exchange equipment 3 mainly exchanges heat with medium-temperature flue gas generated after heat is released so as to recover heat of the medium-temperature flue gas, heats the low-temperature desulfurized flue gas after being desulfurized into medium-temperature and low-temperature desulfurized flue gas to enable the medium-temperature and low-temperature desulfurized flue gas to reach the temperature required by denitration, a high-temperature flue gas inlet 3-1 of the flue gas heat exchange equipment is connected with a second flue gas outlet 2-3 of the mineral heating and roasting equipment 2, a low-temperature flue gas inlet 3-2 of the flue gas heat exchange equipment is connected with a third flue gas outlet 4-3 of the dry-method desulfurization equipment 4, a high-temperature flue gas outlet 3-3 of the flue gas heat exchange equipment is connected with a third flue gas inlet 4-1 of the dry-method desulfurization equipment 4, and a low-.
The dry desulfurization equipment 4 mainly removes sulfides in the flue gas so as to enable the content of the sulfides in the flue gas to reach the emission standard and eliminate the influence of the sulfides on the flue gas denitration, a third flue gas inlet 4-1 is connected with a high-temperature flue gas outlet 3-3 of the flue gas heat exchange equipment 3, a desulfurizer inlet 4-2 is connected with a desulfurizer supply system, and a third flue gas outlet 4-3 is connected with a low-temperature flue gas inlet 3-2 of the flue gas heat exchange equipment 3.
The cloth bag dust removal and denitration integrated equipment 5 is mainly used for removing dust and denitration of flue gas to enable the content of dust and the content of nitrogen oxides in the flue gas to reach the emission standard, a fourth flue gas inlet 5-1 of the cloth bag dust removal and denitration integrated equipment is connected with a low-temperature flue gas outlet 3-4 of flue gas heat exchange equipment 3, an ammonia water inlet 5-2 of the cloth bag dust removal and denitration integrated equipment is connected with an ammonia water supply system, a fourth flue gas outlet 5-3 of the cloth bag dust removal and denitration integrated equipment is connected with a fifth flue gas inlet 6-1 of smoke exhaust equipment 6, and a dust outlet 5-4 of the.
The smoke exhausting equipment 6 is mainly used for exhausting clean smoke which reaches the standard, a fifth smoke inlet 6-1 is connected with a fourth smoke outlet 5-3 of the cloth bag dust removal and denitration integrated equipment 5, and a fifth smoke outlet 6-2 is connected with the atmospheric environment.
（1）1000 Nm3Gas and 2500 Nm3The air is fed into the low-nitrogen combustion plant 1 in a proportion of 2000 Nm3The air/h enters the burners 1-4 and reaches 1000 Nm3The gas is mixed, the amount of the introduced air is about 95 percent of the theoretical air amount required by the complete combustion of the gas, the sprayed gas is combusted in an oxygen-deficient state, high-temperature flue gas at about 1000 ℃ is generated, the fuel is almost completely combusted due to the combustion in the oxygen-deficient state, simultaneously, the fuel is lean in oxygen and contains a small amount of CO components and hydrogen components in unreacted gas, the reduction effect can be realized, the thermal nitrogen oxides and the fuel nitrogen oxides are difficult to generate, the gas after the oxygen-deficient combustion moves upwards along a hearth, and the gas is 1-5 at an air inlet and a reburning air outlet and 500 Nm for reburning3Mixing with air at a temperature of about 800 deg.C, and burning the incompletely burnt components to generate nitrogen oxides at 300mg/Nm3The dust content was 10g/Nm3The sulfur dioxide content is 250 mg/Nm3And is discharged from the low-nitrogen combustion device 1.
(2) The temperature of the exhaust gas from the low-nitrogen combustion apparatus 1 was 800 ℃ and the nitrogen oxide content was 300mg/Nm3The dust content was 10g/Nm3The sulfur dioxide content is 250 mg/Nm3High temperature ofThe flue gas enters the mineral heating and roasting equipment 2 to supply the heat contained in the flue gas for mineral roasting, and the roasted mineral is discharged from the mineral heating and roasting equipment 2 and then enters a mineral roasting product storage and utilization system; the high-temperature flue gas with the released heat is changed into the flue gas with the temperature of 500 ℃ and the content of nitrogen oxide of 300mg/Nm3The dust content was 10g/Nm3The sulfur dioxide content is 250 mg/Nm3The medium-temperature flue gas is discharged from the mineral heating and roasting equipment 2.
(3) The temperature of the discharged gas from the mineral heating and roasting equipment 2 is 500 ℃, and the content of nitrogen oxides is 300mg/Nm3The dust content was 10g/Nm3The sulfur dioxide content is 250 mg/Nm3The medium-temperature flue gas enters a flue gas heat exchange device 3, the temperature of the medium-temperature flue gas is 80 ℃, and the content of nitrogen oxides is 300mg/Nm3The dust content was 10g/Nm3The sulfur dioxide content is 50 mu g/Nm3The low-temperature desulfurized flue gas is changed into the desulfurized flue gas with the temperature of 350 ℃ and the content of nitrogen oxides of 300 mu g/Nm3The dust content was 10g/Nm3The sulfur dioxide content is 250 mg/Nm3The medium-low temperature flue gas has the temperature of 80 ℃ and the content of nitrogen oxides of 300mg/Nm3The dust content was 10g/Nm3The sulfur dioxide content is 50 mu g/Nm3The low-temperature desulfurized flue gas is heated to the temperature of 250 ℃ and the content of nitrogen oxides is 300mg/Nm3The dust content was 10g/Nm3The sulfur dioxide content is 50 mu g/Nm3The medium-low temperature desulfurized flue gas has the temperature of 350 ℃ and the content of nitrogen oxides of 300mg/Nm3The dust content was 10g/Nm3The sulfur dioxide content is 250 mg/Nm3The medium-low temperature flue gas, the temperature of 250 ℃ and the content of nitrogen oxides are 300mg/Nm3The dust content was 10g/Nm3The sulfur dioxide content is 50 mu g/Nm3The medium and low temperature desulfurized flue gas is discharged from the flue gas heat exchange equipment 3 after heat exchange.
(4) The medium-low temperature flue gas discharged from the flue gas heat exchange device 3 enters a dry desulfurization device 4 and reacts with an added desulfurizer to carry out desulfurization, the temperature after desulfurization is 350 ℃, and the content of nitrogen oxide is 300mg/Nm3The dust content was 10g/Nm3The sulfur dioxide content is 250 mg/Nm3The medium-low temperature flue gas is changed into the flue gas with the temperature of 80 ℃ and the content of nitrogen oxides of 300mg/Nm3The dust content was 10g/Nm3The sulfur dioxide content is 50 mu g/Nm3The low-temperature desulfurized flue gas is discharged from the dry desulfurization equipment 4 and then enters the flue gas heat exchange equipment 3, the temperature is 500 ℃, and the content of nitrogen oxides is 300mg/Nm3The dust content was 10g/Nm3The sulfur dioxide content is 250 mg/Nm3The medium temperature flue gas heat exchange.
(5) The temperature discharged from the flue gas heat exchange device 3 is 250 ℃, and the content of nitrogen oxides is 300mg/Nm3The dust content was 10g/Nm3The sulfur dioxide content is 50 mu g/Nm3The medium-low temperature desulfurization flue gas enters the cloth bag dedusting and denitration integrated equipment 5, reacts with the added ammonia water to denitrate, simultaneously removes dust, removes and discharges dust, the discharged dust reaches the discharge standard after being treated and is directly discharged or recycled, the temperature is 250 ℃, and the content of nitrogen oxide is 300mg/Nm3The dust content was 10g/Nm3The sulfur dioxide content is 50 mu g/Nm3The medium-low temperature desulfurized flue gas is changed into the desulfurized flue gas with the temperature of 200 ℃ and the content of nitrogen oxides of 80 mu g/Nm after being dedusted and denitrated3The dust content was 75. mu.g/Nm3The sulfur dioxide content is 50 mu g/Nm3The low-temperature desulfurization and denitrification low-dust flue gas is discharged from the cloth bag dust removal and denitrification integrated equipment 6.
(6) The temperature of the gas discharged from the cloth bag dust removal and denitration integrated equipment 5 is 200 ℃, and the content of nitrogen oxide is 80 mug/Nm3The dust content was 75. mu.g/Nm3The sulfur dioxide content is 50 mu g/Nm3The low-temperature desulfurization, denitrification and low-dust flue gas enters the smoke discharging equipment 6 and is treated to reach the standard, the temperature is 150 ℃, and the content of nitrogen oxide is 80 mu g/Nm3The dust content was 75. mu.g/Nm3The sulfur dioxide content is 50 mu g/Nm3The clean flue gas is discharged.
Through the embodiment, the content of nitrogen oxides in flue gas generated by low-nitrogen combustion of blast furnace gas is basically 300-3Compared with the nitrogen oxide of the flue gas produced by the conventional combustion technology, the nitrogen oxide is generally 600 mg/Nm3Above or even above 1000 mg/Nm3The dust and nitrogen oxides in the flue gas can be removed by adopting a cloth bag dust removal and denitration integrated device; adopt sack dust removal denitration integration equipment to carry out dust removal denitration treatment to the flue gas that blast furnace gas burning produced, accomplish two kinds of process processes of dust removal and denitration in one set of equipment, and dust and nitrogen oxide content reach emission standard in the flue gas after the dust removal denitration, required equipment volume has been reduced, the equipment investment has been reduced, sack denitration technique is for SCR denitration technique, the degree of difficulty is less, the cost is lower, dust removal denitration cost has been reduced by a wide margin, the whole expense of carrying out flue gas dust removal denitration than two procedures of the SCR denitration technique and the dust removal technique of conventional adoption can reduce about 20%.
Example 2
The technical scheme of the patent is explained in detail by taking low-nitrogen combustion equipment which adopts coke oven gas as fuel gas and part of flue gas to circulate internally as a specific embodiment.
The technical scheme of the embodiment is shown in fig. 1, 2, 4 and 5, and the seed gas low-nitrogen low-dust combustion purification system used in the embodiment mainly comprises low-nitrogen combustion equipment 1, mineral heating and roasting equipment 2, flue gas heat exchange equipment 3, dry desulfurization equipment 4, cloth bag dust removal and denitration integrated equipment 5, smoke exhaust equipment 6 and the like.
The low-nitrogen combustion equipment 1 is mainly used for low-nitrogen combustion of fuel gas, a fuel gas inlet 1-1 of the low-nitrogen combustion equipment is connected with a fuel gas supply system, an air inlet 1-2 of the low-nitrogen combustion equipment is connected with an air supply system, a first smoke outlet 1-3 of the low-nitrogen combustion equipment is connected with a second smoke inlet 2-1 of mineral heating and roasting equipment 2, and a smoke inlet circulating air port 1-7 for enabling high-temperature smoke to partially circulate back to a hearth is arranged at the first smoke outlet 1-3.
The mineral heating roasting equipment 2 is mainly used for releasing heat of flue gas so as to utilize heat generated by gas combustion for roasting minerals, a second flue gas inlet 2-1 is connected with a first flue gas outlet 1-3 of the low-nitrogen combustion equipment 1, a mineral roasting product outlet 2-2 is connected with a mineral roasting product storage and utilization system, and a second flue gas outlet 2-3 is connected with a high-temperature flue gas inlet 3-1 of the flue gas heat exchange equipment 3.
The flue gas heat exchange equipment 3 mainly exchanges heat with medium-temperature flue gas generated after heat is released so as to recover heat of the medium-temperature flue gas, heats the low-temperature desulfurized flue gas after being desulfurized into medium-temperature and low-temperature desulfurized flue gas to enable the medium-temperature and low-temperature desulfurized flue gas to reach the temperature required by denitration, a high-temperature flue gas inlet 3-1 of the flue gas heat exchange equipment is connected with a second flue gas outlet 2-3 of the mineral heating and roasting equipment 2, a low-temperature flue gas inlet 3-2 of the flue gas heat exchange equipment is connected with a third flue gas outlet 4-3 of the dry-method desulfurization equipment 4, a high-temperature flue gas outlet 3-3 of the flue gas heat exchange equipment is connected with a third flue gas inlet 4-1 of the dry-method desulfurization equipment 4, and a low-.
The dry desulfurization equipment 4 mainly removes sulfides in the flue gas so as to enable the content of the sulfides in the flue gas to reach the emission standard and eliminate the influence of the sulfides on the denitration of the flue gas, a third flue gas inlet 4-1 is connected with a high-temperature flue gas outlet 3-3 of the flue gas heat exchange equipment 3, a desulfurizer inlet 4-2 is connected with a desulfurizer supply system, and a flue gas outlet 4-3 is connected with a low-temperature flue gas inlet 3-2 of the flue gas heat exchange equipment 3.
The cloth bag dust removal and denitration integrated equipment 5 is mainly used for removing dust and denitration of flue gas to enable the content of dust and the content of nitrogen oxides in the flue gas to reach the emission standard, a fourth flue gas inlet 5-1 of the cloth bag dust removal and denitration integrated equipment is connected with a low-temperature flue gas outlet 3-4 of flue gas heat exchange equipment 3, an ammonia water inlet 5-2 of the cloth bag dust removal and denitration integrated equipment is connected with an ammonia water supply system, a fourth flue gas outlet 5-3 of the cloth bag dust removal and denitration integrated equipment is connected with a fifth flue gas inlet 6-1 of smoke exhaust equipment 6, and a dust outlet 5-4 of the.
The smoke exhausting equipment 6 is mainly used for exhausting clean smoke reaching the standard, a fifth smoke inlet 6-1 of the smoke exhausting equipment is connected with a fourth smoke outlet 5-3 of the cloth bag dust removal and denitration integrated equipment 5, and a fifth smoke outlet 6-2 of the smoke exhausting equipment is connected with the atmospheric environment.
（1）1000 Nm3Gas and 4000 Nm3The air enters the low-nitrogen combustion equipment 1 according to a certain proportion, and simultaneously, 20 percent of the total amount of the high-temperature flue gas discharged from the first flue gas outlet 1-3 is circulated and returned to the hearth of the low-nitrogen combustion equipment 1-6 through the flue gas inlet circulating air port 1-7, wherein the temperature of the low-nitrogen combustion equipment is reduced to about 500 ℃ in the conveying process of a conveying pipeline, the concentration of oxygen carried by the air is diluted, and the temperature of the hearth is reduced to about 850 ℃, so that the generation of nitrogen oxides is reduced during the combustion of the gasThe content of nitrogen oxides generated after combustion of fuel gas is 400mg/Nm3The dust content was 15g/Nm3The sulfur dioxide content is 450 mg/Nm3And is discharged from the low-nitrogen combustion device 1.
(2) The temperature of the exhaust gas from the low-nitrogen combustion apparatus 1 was 850 ℃ and the nitrogen oxide content was 400mg/Nm3The dust content was 15g/Nm3The sulfur dioxide content is 450 mg/Nm320 percent of the high-temperature flue gas enters the hearth through a pipeline through a flue gas inlet 1-7 of the low-nitrogen combustion device 1 again in a circulating manner, the rest 80 percent of the high-temperature flue gas enters the mineral heating and roasting device 2 to use the heat contained in the high-temperature flue gas for roasting the minerals, the temperature of the high-temperature flue gas after heat release is 500 ℃, and the content of nitrogen oxides is 340 mg/Nm3The dust content was 15g/Nm3The sulfur dioxide content is 450 mg/Nm3The medium-temperature flue gas is discharged from the mineral heating and roasting equipment 2.
(3) The temperature of the discharged gas from the mineral heating and roasting equipment 2 is 500 ℃, and the content of nitrogen oxides is 400mg/Nm3The dust content was 15g/Nm3The sulfur dioxide content is 450 mg/Nm3The medium-temperature flue gas enters a flue gas heat exchange device 3, the temperature of the medium-temperature flue gas is 80 ℃, and the content of nitrogen oxides is 400mg/Nm3The dust content was 15g/Nm3The sulfur dioxide content was 55. mu.g/Nm3The low-temperature desulfurized flue gas is changed into the desulfurized flue gas with the temperature of 350 ℃ and the content of nitrogen oxides of 400 mu g/Nm3The dust content was 15g/Nm3The sulfur dioxide content is 450 mg/Nm3The medium-low temperature flue gas has the temperature of 80 ℃ and the content of nitrogen oxides of 400mg/Nm3The dust content was 15g/Nm3The sulfur dioxide content was 55. mu.g/Nm3The low-temperature desulfurized flue gas is heated to 250 ℃ and the content of nitrogen oxides is 400mg/Nm3The dust content was 15g/Nm3The sulfur dioxide content was 55. mu.g/Nm3The medium-low temperature desulfurized flue gas has the temperature of 350 ℃ and the content of nitrogen oxides of 400mg/Nm3The dust content was 15g/Nm3The sulfur dioxide content is 450 mg/Nm3The medium-low temperature flue gas, the temperature of 250 ℃ and the content of nitrogen oxides are 400mg/Nm3The dust content was 15g/Nm3The sulfur dioxide content was 55. mu.g/Nm3The medium and low temperature desulfurized flue gas is discharged from the flue gas heat exchange equipment 3 after heat exchange.
(4) The medium-low temperature flue gas discharged from the flue gas heat exchange device 3 enters a dry desulfurization device 4 and reacts with an added desulfurizer to carry out desulfurization, the temperature after desulfurization is 350 ℃, and the content of nitrogen oxide is 400mg/Nm3The dust content was 15g/Nm3The sulfur dioxide content is 450 mg/Nm3The medium-low temperature flue gas is changed into the flue gas with the temperature of 80 ℃ and the content of nitrogen oxides of 400mg/Nm3The dust content was 15g/Nm3The sulfur dioxide content was 55. mu.g/Nm3The low-temperature desulfurized flue gas is discharged from the dry desulfurization equipment 4 and then enters the flue gas heat exchange equipment 3, the temperature is 500 ℃, and the content of nitrogen oxides is 400mg/Nm3The dust content was 10g/Nm3The sulfur dioxide content is 450 mg/Nm3The medium temperature flue gas heat exchange.
(5) The temperature discharged from the flue gas heat exchange device 3 is 250 ℃, and the content of nitrogen oxides is 400mg/Nm3The dust content was 15g/Nm3The sulfur dioxide content was 55. mu.g/Nm3The medium-low temperature desulfurization flue gas enters a cloth bag dedusting and denitration integrated device 5, reacts with added ammonia water to denitrate, simultaneously removes dust, removes and discharges dust, the discharged dust reaches the discharge standard after being treated and is directly discharged or recycled, the temperature is 250 ℃, and the content of nitrogen oxide is 400mg/Nm3The dust content was 15g/Nm3The sulfur dioxide content was 55. mu.g/Nm3The medium-low temperature desulfurized flue gas is changed into the desulfurized flue gas with the temperature of 200 ℃ and the content of nitric oxide of 70 mu g/Nm after being dedusted and denitrated3The dust content was 65. mu.g/Nm3The sulfur dioxide content was 55. mu.g/Nm3The low-temperature desulfurization and denitrification low-dust flue gas is discharged from the cloth bag dust removal and denitrification integrated equipment 5.
(6) The temperature of the gas discharged from the cloth bag dust removal and denitration integrated equipment 5 is 200 ℃, and the content of nitrogen oxide is 70 mu g/Nm3The dust content was 65. mu.g/Nm3The sulfur dioxide content was 55. mu.g/Nm3Low-temperature desulfurization and denitrification low-dust flue gas inletThe nitrogen oxide content reaches 70 mu g/Nm at a temperature of 150 ℃ after being treated in the smoke exhaust equipment 63The dust content was 65. mu.g/Nm3The sulfur dioxide content was 55. mu.g/Nm3The clean flue gas is discharged.
Similar to the example 1, the content of nitrogen oxides in the flue gas generated by the low-nitrogen combustion of the coke oven gas can also be 300-400mg/Nm3And the dust and the nitrogen oxides in the flue gas can be removed by adopting the cloth bag dust removal and denitration integrated equipment, so that the advantages of the technology in the aspects of economy, technology and the like in the embodiment 1 are realized.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (7)
1. A low-nitrogen low-dust combustion purification method for fuel gas is characterized by comprising the following steps:
s1, feeding fuel gas and air into low-nitrogen combustion equipment in a certain proportion for low-nitrogen combustion to generate high-temperature flue gas, and discharging the high-temperature flue gas from the low-nitrogen combustion equipment;
s2, high-temperature flue gas discharged from the low-nitrogen combustion equipment enters mineral heating and roasting equipment, heat contained in the high-temperature flue gas is used for roasting minerals, the roasted mineral products enter a mineral roasting product storage and utilization system after being discharged from the mineral heating and roasting equipment, and the high-temperature flue gas after heat is released is changed into medium-temperature flue gas and is discharged from the mineral heating and roasting equipment;
s3, allowing the medium-temperature flue gas discharged from the mineral heating and roasting equipment to enter flue gas heat exchange equipment, exchanging heat with low-temperature desulfurized flue gas to change the medium-temperature flue gas into low-temperature flue gas, heating the low-temperature desulfurized flue gas into the medium-temperature and low-temperature desulfurized flue gas, and discharging the medium-temperature and low-temperature desulfurized flue gas from the flue gas heat exchange equipment after exchanging heat;
s4, feeding the medium-low temperature flue gas discharged from the flue gas heat exchange equipment into dry desulfurization equipment, reacting with a desulfurizer to carry out desulfurization, changing the desulfurized medium-low temperature flue gas into low-temperature desulfurized flue gas, discharging the low-temperature desulfurized flue gas from the dry desulfurization equipment, feeding the low-temperature desulfurized flue gas into flue gas heat exchange equipment, and exchanging heat with medium-temperature flue gas to form medium-low temperature desulfurized flue gas;
s5, feeding the medium-low temperature desulfurized flue gas discharged from the flue gas heat exchange equipment into cloth bag dedusting and denitration integrated equipment, reacting with ammonia water for denitration, dedusting, removing dust and discharging, wherein the discharged dust meets the discharge standard after being treated and is directly discharged, or is recycled as raw materials such as building materials, and the medium-low temperature desulfurized flue gas is changed into low-temperature desulfurized and denitrated low-dust flue gas after being dedusted and denitrated and is discharged from the cloth bag dedusting and denitration integrated equipment;
s6, enabling the low-temperature desulfurization and denitrification low-dust flue gas discharged from the cloth bag dust removal and denitrification integrated equipment to enter smoke discharging equipment, and treating the low-temperature desulfurization and denitrification low-dust flue gas into standard clean flue gas to be discharged.
2. The low-nitrogen and low-dust combustion purification method for the fuel gas as claimed in claim 1, wherein the low-nitrogen combustion mode in the step S1 is that the amount of the primary introduced air is less than the theoretical air amount required for complete combustion of the fuel gas, so that the injected fuel gas is combusted in an oxygen-deficient state, the oxygen-deficient combusted gas moves up along the furnace and is mixed with air for reburning at the air inlet for reburning, and simultaneously, the incompletely combusted components in the fuel gas are completely combusted.
3. The low-nitrogen and low-dust combustion purification method for the fuel gas as claimed in claim 1, wherein the low-nitrogen combustion mode in the step S1 includes that the part of the high-temperature flue gas discharged is circulated back to the hearth through the flue gas inlet circulation port.
4. A gas low-nitrogen low-dust combustion purification system comprises: low-nitrogen combustion equipment, mineral heating and roasting equipment, flue gas heat exchange equipment, dry desulfurization equipment, cloth bag dust removal and denitration integrated equipment and smoke exhaust equipment; the method is characterized in that:
the low-nitrogen combustion equipment is mainly used for gas low-nitrogen combustion and is provided with a gas inlet, an air inlet and a first smoke outlet, wherein the gas inlet is connected with a gas supply system, the air inlet is connected with the air supply system, and the first smoke outlet is connected with a second smoke inlet of the mineral heating and roasting equipment;
the mineral heating roasting equipment is mainly used for releasing the heat of flue gas for roasting minerals and is provided with a second flue gas inlet, a mineral roasted product outlet and a second flue gas outlet, wherein the second flue gas inlet is connected with the first flue gas outlet of the low-nitrogen combustion equipment, the mineral roasted product outlet is connected with a mineral roasted product storage and utilization system, and the second flue gas outlet is connected with a high-temperature flue gas inlet of the flue gas heat exchange equipment;
the flue gas heat exchange equipment is mainly used for further exchanging heat for medium-temperature flue gas generated after heat is released so as to recover heat of the medium-temperature flue gas, heating the low-temperature desulfurized flue gas after being desulfurized into medium-temperature and low-temperature desulfurized flue gas so as to enable the medium-temperature and low-temperature desulfurized flue gas to reach the temperature required by denitration, and is provided with a high-temperature flue gas inlet, a low-temperature flue gas inlet, a high-temperature flue gas outlet and a low-temperature flue gas outlet, wherein the high-temperature flue gas inlet is connected with a second flue gas outlet of the mineral heating and roasting equipment, the low-temperature flue gas inlet is connected with a third flue gas outlet of the dry-method desulfurization equipment, the high-temperature flue gas outlet is connected with a third flue gas inlet of the dry;
the dry desulfurization equipment is mainly used for removing sulfides in the flue gas so as to enable the content of the sulfides in the flue gas to reach the emission standard and eliminate the influence of the sulfides on flue gas denitration, and is provided with a third flue gas inlet, a desulfurizer inlet and a third flue gas outlet, wherein the third flue gas inlet is connected with a high-temperature flue gas outlet of flue gas heat exchange equipment, the desulfurizer inlet is connected with a desulfurizer supply system, and the third flue gas outlet is connected with a low-temperature flue gas inlet of the flue gas heat exchange equipment;
the cloth bag dust removal and denitration integrated equipment is mainly used for removing dust and denitration of flue gas to enable the content of dust and the content of nitrogen oxides in the flue gas to reach the emission standard, and is provided with a fourth flue gas inlet, an ammonia inlet, a fourth flue gas outlet and a dust outlet, wherein the fourth flue gas inlet is connected with a low-temperature flue gas outlet of flue gas heat exchange equipment, the ammonia inlet is connected with an ammonia water supply system, the fourth flue gas outlet is connected with a fifth flue gas inlet of smoke exhaust equipment, and the dust outlet is connected with a dust collection and treatment system;
the fume extractor is mainly used for discharging and processing clean fume reaching the standard, and is provided with a fifth fume inlet and a fifth fume outlet, wherein the fifth fume inlet is connected with a fourth fume outlet of the cloth bag dedusting and denitration integrated equipment, and the fifth fume outlet is connected with the atmospheric environment.
5. The low-nitrogen low-dust combustion purification system for the fuel gas as claimed in claim 4, wherein the low-nitrogen combustion device is provided with an air inlet and a reburning port.
6. The low-nitrogen low-dust combustion purification system for the fuel gas as claimed in claim 4, wherein the low-nitrogen combustion equipment is provided with a flue gas inlet circulation port for partially circulating the high-temperature flue gas back into the hearth.
7. The gas low-nitrogen low-dust combustion purification system as claimed in claims 4 to 7, wherein a denitration catalyst is coated on the filter bag of the cloth bag dust removal and denitration integrated equipment.
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