CN211302509U - Sintering flue gas SCR denitration and de-whitening system - Google Patents
Sintering flue gas SCR denitration and de-whitening system Download PDFInfo
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- CN211302509U CN211302509U CN201921810115.1U CN201921810115U CN211302509U CN 211302509 U CN211302509 U CN 211302509U CN 201921810115 U CN201921810115 U CN 201921810115U CN 211302509 U CN211302509 U CN 211302509U
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Abstract
The utility model relates to a sintering flue gas SCR denitration whitening system, including flue gas condensation whitening defogging gas wash tower, heat transfer device, the hot-blast furnace, the ammonia evaporator, dilution fan, the ammonia injection grid, SCR denitration reaction device and fume extractor, heat transfer device sets up and takes off between whitening defogging gas wash tower and SCR denitration reaction device in flue gas condensation, heat transfer device is used for carrying out the heat transfer to the flue gas temperature who is used for around the denitration, be connected through the second flue between heat transfer device's the former export of flue gas and SCR denitration reaction device's the air inlet, the flow direction of flue gas is arranged in the second flue is followed to hot-blast furnace and ammonia injection grid in proper order, ammonia evaporator and dilution fan set up between ammonia injection grid and SCR denitration reaction device's gas outlet. The utility model discloses can carry out the SCR denitration to the sintering flue gas after the desulfurization and carry out the whiting simultaneously and handle, improve purifying effect, the reduction environmental pollution to sintering flue gas after the wet flue gas desulfurization.
Description
Technical Field
The utility model belongs to sintering flue gas pollutant and flue gas take off white control field, concretely relates to sintering flue gas SCR denitration takes off white system.
Background
At present, the steel smelting industry is an industry with high energy consumption and heavy pollution. Sintering flue gas generated in the high-temperature sintering process of steel contains gases of various pollution components, wherein the pollution components comprise particulate matters, NOx, SO2 and other acid gases, and the pollution gases are one of the main causes of atmospheric pollution. The current emission standard of atmospheric pollutants for the steel sintering and pelletizing industry (GB 28662-2012) stipulates that the emission limits of particulate matters, NOx and SO2 in sintering flue gas are respectively 50mg/m3、200mg/m3、300mg/m3. However, the treatment of sintering flue gas at the present stage mainly remains in the aspects of desulfurization and dust removal, and the treatment of pollutants such as denitration is not fully developed. Along with the development of economy, the degree of attention of people to the environment is increasing day by day, the requirements of the environment standards in all parts of the country are becoming stricter and stricter, and in order to further improve the quality of the atmospheric environment in China, the ecological environment department publishes a 'letter about the proposal of the ultralow emission modification (quotation of comments) > of iron and steel enterprises' in 2018: the method proposes that all newly-built (including moving) steel projects reach an ultra-low emission level, and the hourly average emission standard of main pollutants of sintering machine heads and pellet roasting flue gas is as follows under the condition that the reference oxygen content is 16 percent: NOx emission concentration < 50mg/Nm3SO2 emission concentration is less than 35mg/Nm3And the smoke emission concentration is less than 10mg/Nm3. Meanwhile, the saturated flue gas after wet desulphurization has a low temperature, and if the saturated flue gas is directly discharged from a chimney and is mixed with outside cold air, water vapor in the flue gas is condensed to form white smoke plume, so that the atmospheric pollution is not only visual pollution, but also substantial pollution. And traditional flue gas denitration treatment process is difficult to adapt to, also can not satisfy new environmental standard moreover, consequently is essential to steel industry sintering section denitration transformation. Under the background, it is necessary to research an SCR denitration and whitening system and process for sintering flue gas after wet desulfurization.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a sintering flue gas SCR denitration takes off white system is provided to above-mentioned prior art, carries out the SCR denitration to the sintering flue gas after the desulfurization and takes off white processing simultaneously, improves purifying effect, the reduction environmental pollution of sintering flue gas after to wet flue gas desulfurization.
The utility model provides a technical scheme that above-mentioned problem adopted does: a sintering flue gas SCR denitration and de-whitening system comprises a flue gas condensation de-whitening and de-whitening dust removal tower, a heat exchange device, a hot blast stove, an ammonia water evaporator, a dilution fan, an ammonia spraying grid, an SCR denitration reaction device and a smoke exhaust device, wherein a slurry area, a spraying area, a de-fogging and de-dusting area and a heating area are sequentially arranged in the flue gas condensation de-whitening and de-dusting tower from bottom to top, a first main flue is connected between a raw flue gas inlet of the heat exchange device and a gas outlet of the flue gas condensation de-whitening and de-dusting tower, a second main flue is connected between a raw flue gas outlet of the heat exchange device and a gas inlet of the SCR denitration reaction device, a third main flue is connected between a clean flue of the heat exchange device and the gas outlet of the SCR de-whitening and de-dusting tower, the ammonia injection grid is arranged on the second main flue, the ammonia evaporator and the dilution fan are arranged between the ammonia injection grid and the third main flue, the ammonia evaporator is used for evaporating and vaporizing concentrated ammonia water into ammonia gas, the dilution fan is used for introducing part of high-temperature clean flue gas subjected to denitration by the SCR denitration reaction device into the ammonia evaporator to mix with the ammonia gas, and the ammonia injection grid is used for spraying the mixed ammonia gas into the second main flue.
Preferably, the flue gas condensation takes off white defogging gas wash tower includes the tower body, the top of tower body is provided with the chimney, the inside of tower body is supreme from bottom to be provided with thick liquid district, spray zone, defogging dust removal district and the zone of heating in proper order, be provided with a plurality of spray set from bottom to top interval arrangement in the spray zone, be provided with tube bundle formula defogging dust remover in the defogging dust removal district, be provided with heating device in the zone of heating, spray set is used for condensing the flue gas, tube bundle formula defogging dust remover is used for carrying out the defogging dust removal to the flue gas after the condensation, heating device is used for heating the flue gas after the defogging dust removal.
Preferably, the spraying device comprises a plurality of spraying layers, each spraying layer comprises a plurality of atomizing nozzles arranged side by side, a circulating pipeline is arranged between each atomizing nozzle and the slurry area at the bottom of the tower body, and a circulating pump is arranged on each circulating pipeline;
the tube bundle type demisting and dedusting device comprises a plurality of guide tubes which are vertically arranged, two guide vanes which are vertically arranged are arranged in each guide tube, a rotational flow assembly is arranged between the two guide vanes, each rotational flow assembly comprises a straight cylinder and two conical cylinders which are relatively reduced and arranged in the straight cylinder, and the two conical cylinders are vertically symmetrically arranged and are communicated with each other.
Preferably, the heat exchange device is a rotary GGH heat exchanger.
Preferably, the heat source of the hot blast stove is blast furnace gas.
Preferably, one end of the hot blast stove is connected with a blower.
Preferably, the ammonia injection grid comprises a plurality of thin steel pipes which are parallel to each other up and down, a plurality of injection holes which are arranged at intervals along the length direction of the thin steel pipes are formed in the thin steel pipes, and the opening direction of the injection holes is the same as the flowing direction of the flue gas in the second main flue.
Preferably, the SCR denitration reactor is a medium-low temperature SCR denitration reactor, and two catalyst reaction layers and a catalyst reservation layer are disposed in the SCR denitration reactor.
Preferably, an induced draft fan is arranged on the fourth main flue.
The sintering flue gas SCR denitration and whitening process adopts the sintering flue gas SCR denitration and whitening system to carry out denitration and whitening treatment on sintering flue gas subjected to wet desulphurization, and comprises the following specific steps:
step one, a flue gas de-whitening condensation and flue gas demisting and dedusting stage
The sintering flue gas after wet desulphurization enters a flue gas condensation, whitening, demisting and dedusting tower, and passes through a spraying zone, a demisting and dedusting zone and a heating zone in sequence to change saturated flue gas into unsaturated flue gas, so that the purposes of whitening, condensing and demisting and dedusting the flue gas are realized;
step two, a flue gas temperature rising stage
a. Flue gas heat exchange before denitration
The flue gas after being subjected to whitening condensation, demisting and dedusting is subjected to primary temperature rise to about 245 ℃ through a heat exchange device;
b. second heating
Secondarily heating the flue gas subjected to heat exchange to about 280 ℃ through a hot blast stove;
step three, ammonia spraying treatment stage
The concentrated ammonia water is vaporized into ammonia gas in the ammonia water evaporator, part of high-temperature clean flue gas denitrated by the SCR denitration reaction device is introduced into the ammonia water evaporator by the dilution fan to be mixed with the ammonia gas, the mixed ammonia gas is sprayed into the second main flue through the ammonia spraying grid, and the mixed ammonia gas is further mixed with the flue gas which is secondarily heated in the second main flue;
step four, SCR denitration treatment stage
Mixing the secondarily heated flue gas with ammonia gas, then feeding the mixture into an SCR denitration reaction device, mixing the mixture with the flue gas in the SCR denitration reaction device again, fully mixing the ammonia gas with nitrogen oxide in the flue gas, carrying out chemical reaction under the action of a catalyst, and removing the nitrogen oxide;
step five, a smoke cooling stage
Cooling the denitrated high-temperature clean flue gas to 85-90 ℃ through a heat exchange device;
step six, smoke discharging stage
And discharging the denitrated and whitened smoke through the smoke exhaust device after the cooled clean smoke.
Compared with the prior art, the utility model has the advantages of:
1. the utility model provides a flue gas condensation takes off and has set gradually spray set, tube bundle formula defogging dust remover and heating device in the white defogging gas wash tower from bottom to supreme, compact structure in the tower, practice thrift the place, when operation easy operation, running cost low, safe and reliable, dust collection efficiency height, flue gas heating range are lower, can realize better dust removal and take off white effect.
2. Because the tube bundle type demisting and dedusting device is arranged in the flue gas condensation and whitening demisting and dedusting tower, the field is saved, meanwhile, small particles in the flue gas can be removed, the denitration of a follow-up SCR catalyst is not influenced, and the dust in the flue gas is up to standard.
3. The utility model provides a chimney is installed at the top of flue gas condensation white defogging gas wash tower that takes off, practices thrift the place, reduces the cost, and the white flue gas of taking off after the condensation reheating can directly discharge after removing dust up to standard.
4. The utility model provides a heat transfer device has realized the flue gas heat transfer around the denitration, and the low temperature flue gas temperature before the denitration is once heaied up by the heat exchanger, carries out the secondary heating to the flue gas through the hot-blast furnace, heaies up the flue gas temperature to the operating temperature of SCR catalyst, and the clean flue gas temperature of high temperature after the denitration is through the heat transfer device heat transfer, with flue gas temperature drop to smoke exhaust temperature, utilizes the poor transmission of heat to carry out the heat transfer, has practiced thrift the energy greatly.
5. The utility model provides a flue gas condensation takes off white defogging gas wash tower and heat transfer device collaborative work, makes the earlier condensation cooling of the wet flue gas of saturation after the desulfurization, gets rid of the moisture content in the flue gas, and the clean flue gas after the denitration is again through heat transfer device with the temperature drop to 85 ℃ -90 ℃, is equivalent to the condensation reheat method and takes off white reheat section, discharges after heaies up to the flue gas promptly, finally eliminates "white plume" phenomenon, accomplishes the flue gas and takes off white.
6. The utility model discloses a dilute the fan and introduce the ammonia water evaporimeter with clean flue gas behind the denitration in, both can dilute the ammonia concentration, also can reduce nitrogen oxide concentration in the flue gas, make the effectual cyclic utilization of heat energy in SCR denitration reaction unit simultaneously, practiced thrift the energy.
Drawings
FIG. 1 is the utility model relates to a sintering flue gas SCR denitration and de-whitening system's schematic diagram.
Fig. 2 is a schematic structural diagram of a flue gas condensation, de-whitening, demisting and dedusting tower.
FIG. 3 is a schematic view of the internal structure of a flow guide tube in a tube bundle type mist and dust remover.
FIG. 4 is a top view of a tube bundle defogging dust collector.
Wherein:
the system comprises a flue gas condensation, whitening, demisting and dedusting tower 1, a tower body 101, a chimney 102, a spraying device 103, a spraying layer 103.1, an atomizing nozzle 103.2, a tube bundle type demisting and dedusting device 104, a guide tube 104.1, guide vanes 104.2, a straight cylinder 104.3, a conical cylinder 104.4 and a heating device 105
The heat exchange device 2, a raw flue gas inlet 21, a raw flue gas outlet 22, a purified flue gas inlet 23 and a purified flue gas outlet 24
A blower 3,
A hot blast furnace 4,
An ammonia water evaporator 5,
A dilution fan 6,
An ammonia injection grid 7,
An SCR denitration reaction device 8,
First main flue 11
Second main flue 12
Third main flue 13
Fourth main flue 14
A bypass flue 15.
Detailed Description
The present invention will be described in further detail with reference to the following embodiments.
Referring to fig. 1-4, the utility model relates to a sintering flue gas SCR denitration whitening system, which comprises a flue gas condensation whitening, demisting and dedusting tower 1, a heat exchange device 2, a hot-blast stove 4, an ammonia evaporator 5, a dilution fan 6, an ammonia injection grid 7, an SCR denitration reaction device 8 and a smoke exhaust device 10, wherein a first main flue 11 is connected between an original flue gas inlet 21 at the lower part of the heat exchange device 2 and an air outlet of the flue gas condensation whitening, demisting and dedusting tower 1, a second main flue 12 is connected between an original flue gas outlet 22 at the upper part of the heat exchange device 2 and an air inlet of the SCR denitration reaction device 8, a third main flue 13 is connected between a clean flue gas inlet 23 at the upper part of the heat exchange device 2 and an air outlet of the SCR denitration reaction device 8, and a fourth main flue 14 is connected between a clean flue gas outlet 24 at the lower part of the heat, the hot blast stove 4 and the ammonia injection grid 7 are sequentially arranged along the flow direction of flue gas in the second main flue 12, a branch flue 15 is connected between the hot blast stove 4 and the second main flue 12, the ammonia injection grid 7 is arranged on the second main flue 12, the ammonia evaporator 5 and the dilution fan 6 are arranged between the ammonia injection grid 7 and the third main flue 13, the ammonia evaporator 5 is used for evaporating and vaporizing concentrated ammonia water into ammonia gas, the dilution fan 6 is used for introducing part of high-temperature clean flue gas denitrated by the SCR denitration reaction device 8 into the ammonia evaporator 5 so as to mix the high-temperature clean flue gas with the ammonia gas and dilute the concentration of the ammonia gas, and the ammonia injection grid 7 is used for injecting the mixed ammonia gas into the second main flue 12;
the flue gas condensation, de-whitening, demisting and dedusting tower 1 comprises a tower body 101, a chimney 102 is arranged at the top of the tower body 101, a slurry area, a spraying area, a demisting and dedusting area and a heating area are sequentially arranged in the tower body 101 from bottom to top, a plurality of spraying devices 103 are arranged in the spraying area at intervals from bottom to top, a tube bundle type demisting and dedusting device 104 is arranged in the demisting and dedusting area, a heating device 105 is arranged in the heating area, the spraying devices 103 are used for condensing flue gas, the tube bundle type demisting and dedusting device 104 is used for demisting and dedusting condensed flue gas, and the heating device 105 is used for heating the flue gas after demisting and dedusting, so that saturated flue gas is changed into unsaturated flue gas, thereby realizing demisting and dedusting of flue gas and de-whitening of flue gas, and achieving;
the spraying device 103 comprises a plurality of spraying layers 103.1, the spraying layers 103.1 comprise a plurality of atomizing nozzles 103.2 which are arranged side by side, a circulating pipeline is arranged between the atomizing nozzles 103.2 and a slurry area at the bottom of the tower body 101, and a circulating pump is arranged on the circulating pipeline;
the spraying layer 103.1 is provided with at least three layers;
the tube bundle type demisting and dedusting device 104 comprises a plurality of guide tubes 104.1 which are vertically arranged, two guide vanes 104.2 which are vertically arranged are arranged in the guide tube 104.1, a rotational flow component is arranged between the two guide vanes 104.2, the rotational flow component comprises a straight cylinder 104.3 and two relatively reduced conical cylinders 104.4 which are arranged in the straight cylinder 104.3, the two conical cylinders 104.4 are vertically and symmetrically arranged and are communicated with each other, the large caliber of the conical cylinder 104.4 is the same as the inner diameter of the straight cylinder 104.3, and the flow velocity of flue gas can be accelerated by the matching use of the guide vanes 104.2 and the rotational flow component, so that mist and micro-dust particles in the flue gas can be fully separated and purified;
the heat source of the heating device 105 heats the demisted and dedusted flue gas by adopting flue gas heating or electric heating, and the flue gas is discharged through the chimney 102 when the temperature of the flue gas is heated to the temperature set by the local environment;
the spraying area and the demisting and dedusting area are respectively provided with a spraying flushing device and a demister flushing device which are respectively used for periodically flushing the spraying device 103 and the tube bundle type demisting and dedusting device 104 so as to avoid blockage caused by accumulation of smoke dust;
the heat exchange device 2 is a rotary GGH heat exchanger, and has the advantages of mature technology, corrosion resistance, uneasiness for ash blocking and the like, the heat exchange device 2 is used for carrying out heat exchange treatment on low-temperature raw flue gas treated by the flue gas condensation, whitening, demisting and dedusting tower 1 and high-temperature clean flue gas after being denitrated by the SCR denitration reaction device 8, namely, carrying out primary heating treatment on the low-temperature raw flue gas and cooling treatment on the high-temperature clean flue gas, the heat exchange device 2 realizes flue gas heat exchange before and after denitration, and effectively saves energy;
the heat source of the hot blast stove 4 adopts blast furnace gas to carry out secondary heating treatment on the flue gas, so that the temperature of the flue gas is heated to the temperature range required by the SCR denitration reaction device 8;
one end of the hot blast stove 4 is connected with a blower 3, and the combustion temperature of the hot blast stove 4 is adjusted through the air doping amount of the blower 3;
the ammonia water evaporator 5 is a high temperature and high pressure resistant container, concentrated ammonia water and compressed air are atomized under the action of a spray gun arranged in the ammonia water evaporator 5, and are heated under the action of high temperature clean flue gas after denitration introduced by a dilution fan 6, so that the concentrated ammonia water is vaporized into ammonia gas and is mixed with the flue gas, and the mixed ammonia gas is sprayed into the second main flue 12 through an ammonia spraying grid 7 and is further mixed with the original flue gas in the second main flue 12;
the ammonia injection grid 7 comprises a plurality of thin steel pipes which are parallel to each other up and down, a plurality of injection holes which are arranged at intervals along the length direction of the thin steel pipes are formed in the thin steel pipes, and the opening direction of the injection holes is the same as the flowing direction of the flue gas in the second main flue 12;
the SCR denitration reactor 8 is a medium-low temperature SCR denitration reactor, and two catalyst reaction layers and a catalyst reservation layer are arranged in the SCR denitration reactor;
and an induced draft fan 9 is arranged on the fourth main flue 14.
A sintering flue gas SCR denitration and de-whitening process adopts a sintering flue gas SCR denitration and de-whitening system to perform denitration and de-whitening treatment on sintering flue gas subjected to wet desulphurization, and comprises the following specific steps:
step one, a flue gas de-whitening condensation and flue gas demisting and dedusting stage
The sintering flue gas after wet desulphurization enters a flue gas condensation, whitening, demisting and dedusting tower, and passes through a spraying zone, a demisting and dedusting zone and a heating zone in sequence to change saturated flue gas into unsaturated flue gas, so that the purposes of whitening, condensing and demisting and dedusting the flue gas are realized;
the flue gas is subjected to whitening condensation by a spraying device, partial pollutants and particulate matters in the flue gas are removed, the temperature of the flue gas is further reduced by a tube bundle type demisting dust remover, the moisture content in saturated wet flue gas is removed, particulate matters, liquid drops and the like in the flue gas can be removed, and finally the temperature of the flue gas is heated to the temperature set by the local environment (over 75 ℃ in summer and over 80 ℃ in winter) by a heating zone and then is discharged into a first main flue through a chimney;
step two, a flue gas temperature rising stage
a. Flue gas heat exchange before denitration
The flue gas after being subjected to whitening condensation, demisting and dedusting is subjected to primary temperature rise to about 245 ℃ through a heat exchange device;
b. second heating
Secondarily heating the flue gas subjected to heat exchange to about 280 ℃ through a hot blast stove;
step three, ammonia spraying treatment stage
The concentrated ammonia water is vaporized into ammonia gas in the ammonia water evaporator, part of high-temperature clean flue gas denitrated by the SCR denitration reaction device is introduced into the ammonia water evaporator by the dilution fan to be mixed with the ammonia gas, the mixed ammonia gas is sprayed into the second main flue through the ammonia spraying grid, and the mixed ammonia gas is further mixed with the flue gas which is secondarily heated in the second main flue;
step four, SCR denitration treatment stage
The flue gas after secondary heating and ammonia gas are mixed and then enter an SCR denitration reaction device, and are mixed with the flue gas in the SCR denitration reaction device again, the ammonia gas (NH3) is fully mixed with nitrogen oxide (NOx) in the flue gas, a chemical reaction is carried out under the action of a catalyst, the NOx is removed, and the reaction equation is as follows:
step five, a smoke cooling stage
Cooling the denitrated high-temperature clean flue gas to 85-90 ℃ through a heat exchange device;
step six, smoke discharging stage
And discharging the denitrated and whitened smoke through the smoke exhaust device after the cooled clean smoke.
After the process flow, the content concentration of nitrogen oxide in the sintering flue gas after wet desulphurization can reach the standard of ultra-clean emission, namely NOx is less than or equal to 50mg/m3In addition, after the desulfurized sintering flue gas is treated by a condensation reheating method, the emission temperature of the desulfurized sintering flue gas is about 85-90 ℃, and the aims of flue gas denitration and flue gas whitening are successfully realized.
In addition to the above embodiments, the present invention also includes other embodiments, and all technical solutions formed by equivalent transformation or equivalent replacement should fall within the protection scope of the claims of the present invention.
Claims (9)
1. The utility model provides a sintering flue gas SCR denitration and white-removing system which characterized in that: comprises a flue gas condensation de-whitening demisting and dedusting tower (1), a heat exchange device (2), a hot blast stove (4), an ammonia evaporator (5), a dilution fan (6), an ammonia spraying grid (7), an SCR denitration reaction device (8) and a smoke exhaust device (10), wherein a slurry area, a spraying area, a demisting and dedusting area and a heating area are sequentially arranged in the flue gas condensation de-whitening and demisting and dedusting tower (1) from bottom to top, a first main flue (11) is connected between an original flue gas inlet (21) of the heat exchange device (2) and a gas outlet of the flue gas condensation de-whitening and demisting and dedusting tower (1), a second main flue (12) is connected between an original flue gas outlet (22) of the heat exchange device (2) and a gas inlet of the SCR denitration reaction device (8), and a third main flue (13) is connected between a clean flue gas inlet (23) of the heat exchange device (2) and a gas outlet of the SCR denitration reaction device (8, a fourth main flue (14) is connected between the clean flue gas outlet (24) of the heat exchange device (2) and the gas inlet of the smoke exhaust device (10), the hot blast stove (4) and the ammonia injection grid (7) are sequentially arranged along the flow direction of the flue gas in the second main flue (12), a branch flue (15) is connected between the hot blast stove (4) and the second main flue (12), the ammonia injection grid (7) is arranged on the second main flue (12), the ammonia water evaporator (5) and the dilution fan (6) are arranged between the ammonia injection grid (7) and the third main flue (13), the ammonia water evaporator (5) is used for evaporating and vaporizing concentrated ammonia water into ammonia gas, the dilution fan (6) is used for introducing part of high-temperature clean flue gas denitrated by the SCR denitration reaction device (8) into the ammonia water evaporator (5) to be mixed with the ammonia gas, the ammonia injection grid (7) is used for injecting the mixed ammonia gas into the second main flue (12).
2. The sintering flue gas SCR denitration and de-whitening system of claim 1, characterized in that: flue gas condensation takes off white defogging gas wash tower (1) and includes tower body (101), the top of tower body (101) is provided with chimney (102), the inside of tower body (101) has set gradually thick liquids district, spray zone, defogging dust removal district and the zone of heating from bottom to top, be provided with a plurality of spray set (103) of supreme interval arrangement from bottom to top in the spray zone, be provided with tube bank formula defogging dust remover (104) in the defogging dust removal district, be provided with heating device (105) in the zone of heating, spray set (103) are used for condensing the flue gas, tube bank formula defogging dust remover (104) are used for carrying out the defogging to the flue gas after the condensation and remove dust, heating device (105) are used for heating the flue gas after the defogging removes dust.
3. The sintering flue gas SCR denitration and de-whitening system of claim 2, characterized in that: the spraying device (103) comprises a plurality of spraying layers (103.1), the spraying layers (103.1) comprise a plurality of atomizing nozzles (103.2) which are arranged side by side, a circulating pipeline is arranged between the atomizing nozzles (103.2) and a slurry area at the bottom of the tower body (101), and a circulating pump is arranged on the circulating pipeline;
the tube bundle type demisting and dedusting device (104) comprises a plurality of guide tubes (104.1) which are vertically arranged, two guide vanes (104.2) which are vertically arranged are arranged in the guide tubes (104.1), a rotational flow component is arranged between the two guide vanes (104.2), the rotational flow component comprises a straight cylinder (104.3) and two conical cylinders (104.4) which are relatively reduced and arranged in the straight cylinder (104.3), and the two conical cylinders (104.4) are vertically symmetrically arranged and are communicated with each other.
4. The sintering flue gas SCR denitration and de-whitening system of claim 1, characterized in that: the heat exchange device (2) is a rotary GGH heat exchanger.
5. The sintering flue gas SCR denitration and de-whitening system of claim 1, characterized in that: the heat source of the hot blast stove (4) adopts blast furnace gas.
6. The sintering flue gas SCR denitration and de-whitening system of claim 5, characterized in that: one end of the hot blast stove (4) is connected with a blower (3).
7. The sintering flue gas SCR denitration and de-whitening system of claim 1, characterized in that: the ammonia injection grid (7) comprises a plurality of thin steel pipes which are parallel to each other up and down, a plurality of injection holes which are arranged at intervals along the length direction of the thin steel pipes are formed in the thin steel pipes, and the opening direction of the injection holes is the same as the flowing direction of smoke in the second main flue (12).
8. The sintering flue gas SCR denitration and de-whitening system of claim 1, characterized in that: the SCR denitration reactor (8) is a medium-low temperature SCR denitration reactor, and two catalyst reaction layers and a catalyst reservation layer are arranged in the SCR denitration reactor.
9. The sintering flue gas SCR denitration and de-whitening system of claim 1, characterized in that: and an induced draft fan (9) is arranged on the fourth main flue (14).
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| CN110772915A (en) * | 2019-10-25 | 2020-02-11 | 江苏朗润环保科技有限公司 | Sintering flue gas SCR denitration and whitening system and process |
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| CN110772915A (en) * | 2019-10-25 | 2020-02-11 | 江苏朗润环保科技有限公司 | Sintering flue gas SCR denitration and whitening system and process |
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