CN110260348B - Low-temperature corrosion prevention process system and method for bypass preheating flue gas heat exchanger of hot blast stove - Google Patents
Low-temperature corrosion prevention process system and method for bypass preheating flue gas heat exchanger of hot blast stove Download PDFInfo
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- CN110260348B CN110260348B CN201910608734.0A CN201910608734A CN110260348B CN 110260348 B CN110260348 B CN 110260348B CN 201910608734 A CN201910608734 A CN 201910608734A CN 110260348 B CN110260348 B CN 110260348B
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 125
- 239000003546 flue gas Substances 0.000 title claims abstract description 125
- 238000000034 method Methods 0.000 title claims abstract description 28
- 230000008569 process Effects 0.000 title claims abstract description 21
- 238000005536 corrosion prevention Methods 0.000 title claims abstract description 13
- 238000010438 heat treatment Methods 0.000 claims abstract description 13
- 238000012544 monitoring process Methods 0.000 claims description 25
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 24
- 239000000779 smoke Substances 0.000 claims description 22
- 238000009826 distribution Methods 0.000 claims description 21
- 230000002087 whitening effect Effects 0.000 claims description 21
- 238000005245 sintering Methods 0.000 claims description 17
- 238000005260 corrosion Methods 0.000 claims description 14
- 230000007797 corrosion Effects 0.000 claims description 14
- 239000000446 fuel Substances 0.000 claims description 14
- 229910021529 ammonia Inorganic materials 0.000 claims description 12
- 238000006477 desulfuration reaction Methods 0.000 claims description 10
- 230000023556 desulfurization Effects 0.000 claims description 10
- 239000007789 gas Substances 0.000 claims description 9
- 238000002156 mixing Methods 0.000 claims description 7
- 239000012717 electrostatic precipitator Substances 0.000 claims description 6
- 230000001105 regulatory effect Effects 0.000 claims description 6
- 239000003915 liquefied petroleum gas Substances 0.000 claims description 4
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims description 3
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 3
- 235000019504 cigarettes Nutrition 0.000 claims description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 10
- 241000196324 Embryophyta Species 0.000 description 7
- 238000009833 condensation Methods 0.000 description 5
- 230000005494 condensation Effects 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 3
- 230000008676 import Effects 0.000 description 3
- 241000208125 Nicotiana Species 0.000 description 2
- 235000002637 Nicotiana tabacum Nutrition 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- 238000009530 blood pressure measurement Methods 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000003009 desulfurizing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000013022 venting Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
-
- 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
-
- 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
- F23J15/08—Arrangements of devices for treating smoke or fumes of heaters
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chimneys And Flues (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention relates to a low-temperature corrosion prevention process system and a low-temperature corrosion prevention method for a hot blast stove bypass preheating flue gas heat exchanger. The invention can obviously prolong the service life of key equipment for heating the flue gas, thus the invention does not need to increase extra investment, and can also realize the purpose of fully utilizing the heat energy generated by the hot blast stove.
Description
Technical Field
The invention relates to a low-temperature corrosion prevention process system and a low-temperature corrosion prevention process method for a bypass preheating flue gas heat exchanger (GGH) of a hot blast stove, and belongs to the technical field of sintering flue gas treatment.
Background
The sintering machine is the largest SO in steel works 2 And NO X The discharge source has a considerable part of air (40% -50%) which does not pass through the sintering material layer, so that the sintering smoke quantity is greatly increased, and every 1 ton of sintering ore is produced to 4000-6000 m 3 (operating mode) flue gas. Meanwhile, the flue gas has high moisture content and high dew point temperature. In order to improve the air permeability of the sintering mixture, a proper amount of water is added into the mixture to prepare pellets before sintering, so the moisture content of dust-containing flue gas is larger, and the moisture content is generally between 8% and 12%, even up to 15% by volume ratio; the dew point temperature is 65-80 ℃.
At present, a flue gas heat exchanger of a steel plant generally has the problem of low-temperature corrosion, because the dew point temperature of sulfuric acid is usually about 100 ℃, the temperature of flue gas after being treated by a desulfurizing tower or a whitening tower is obviously lower than the dew point temperature of sulfuric acid, and sulfuric acid steam carried in the flue gas is condensed and deposited on the surface of the flue gas heat exchanger to cause low-temperature corrosion.
At present, most steel plants or power plants have no good solution to the low-temperature corrosion of the flue gas heat exchanger, so that the common service life of the flue gas heat exchanger is short, and the failure rate is high.In order to solve the problem, some steel plants choose to use corrosion-resistant materials to manufacture the flue gas heat exchanger, and although the corrosion-resistant effect is improved, the cost is increased and the air leakage coefficient is increased. Some steelworks choose to add additives to the flue gas to neutralize SO 3 Low temperature corrosion is avoided, but this leads to increased operating costs, and also allows for the removal of neutralised products.
Therefore, it has been urgent to provide a technical means for preventing low-temperature corrosion of the flue gas heat exchanger with low investment and high efficiency.
Disclosure of Invention
Compared with the traditional desulfurization, denitrification and whitening process system behind a sintering machine, the key equipment for heating the flue gas, namely the service life of the flue gas heat exchanger (GGH), can be remarkably improved, and meanwhile, the hot blast furnace is necessary equipment in the desulfurization, denitrification and whitening process flow behind the sintering machine, so that additional investment is not required, and the purpose of fully utilizing the heat energy generated by the hot blast furnace can be realized.
The invention solves the problems by adopting the following technical scheme: the utility model provides a hot-blast furnace bypass preheats flue gas heat exchanger and prevents low temperature corrosion process system, it includes hot-blast furnace system and flue gas heat exchanger, the flue gas heat exchanger includes first inlet, first exhaust port, second inlet and second exhaust port, first inlet department connects and is provided with first inlet flue, first inlet flue entry connection sintering plant flue gas, set gradually electrostatic precipitator, main air exhauster, desulfurization system and the white condensation system that takes off on the first inlet flue, be connected between first exhaust port and the hot-blast furnace system and be provided with first exhaust flue, be connected between hot-blast furnace system and the second inlet and be provided with the second and advance the flue gas pipeline, be provided with denitration reactor on the second inlet flue gas pipeline, second inlet connection is provided with the second exhaust flue, second exhaust flue outer end is connected to the chimney, be provided with the draught fan on the second exhaust flue gas pipeline, the second is advanced between flue gas pipeline and the first inlet and is connected and is provided with the bypass flue, bypass one end is connected to between denitration reactor and the white condensation system that takes off between the flue gas to the white condensation system.
Furthermore, an ammonia pipeline is connected and arranged on a second smoke inlet pipeline between the hot blast stove system and the denitration reactor, the outer end of the ammonia pipeline is connected with an ammonia area, and an ammonia water evaporator is arranged on the ammonia pipeline.
Still further, hot-blast furnace system includes hot-blast furnace and combustor, the hot-blast furnace top is provided with the flue mixing chamber, the flue mixing chamber includes two import and an export, and one of them import is connected with first exhaust flue, and another import is connected with the hot-blast furnace exhaust port, and the export is connected with the second and advances the tobacco pipe way, be provided with the bypass flue on the second advances the tobacco pipe way.
Further, a fuel pipeline and a main air pipeline are respectively connected to the burner, an inlet of the fuel pipeline is connected with blast furnace gas, a pore plate flowmeter, a manual cut-off valve, a pressure gauge, a gas pressure high-low switch, a fuel pressure transmitter, a first pneumatic cut-off valve, a second pneumatic cut-off valve and an electric regulating valve are sequentially arranged on the fuel pipeline, an emptying pipeline is arranged between the first pneumatic cut-off valve and the second pneumatic cut-off valve, a manual emptying valve and a pneumatic emptying valve are arranged on the emptying pipeline, and a combustion-supporting air pressure switch and a combustion-supporting fan are arranged on the main air pipeline;
further, an air distribution port is formed in the hot blast stove, an air distribution pipeline is arranged between the first smoke exhaust pipeline and the air distribution port, and an air distribution fan is arranged on the air distribution pipeline.
Still further, be provided with ignition system in the hot-blast furnace, ignition system includes ignition house steward, ignition house steward entry connection liquefied petroleum gas, the last first ignition hand valve and the ignition pneumatic valve of having set gradually of ignition house steward, the export of ignition house steward is divided into a plurality of ignition branch pipes, has set gradually second ignition hand valve and ignition rifle on every ignition branch pipe.
Still further, hot-blast furnace body one side is provided with first temperature monitoring point, hot-blast furnace exhaust port position department is provided with the second temperature monitoring point, be provided with the third temperature monitoring point on the first exhaust pipe, be provided with the fourth temperature monitoring point on the second advances the cigarette pipeline.
Further, the air distribution fan is connected with the second temperature monitoring point and the third temperature monitoring point through a circuit; and the fourth temperature monitoring point is respectively connected with the combustion-supporting fan and the electric regulating valve through circuits.
A process method for preventing low-temperature corrosion of a bypass preheating flue gas heat exchanger of a hot blast stove, comprising the following steps:
step one, flue gas exhausted by a sintering plant sequentially passes through an electrostatic precipitator, a main exhaust fan, a desulfurization system and a whitening condensing system, and the temperature of the flue gas from the whitening condensing system is 45 ℃;
step two, introducing the flue gas of the hot blast stove into a flue after the whitening condensing system through a bypass flue, and heating the flue gas coming out of the whitening condensing system to 100 ℃;
and thirdly, heating the flue gas from the whitening condensing system through a bypass flue, then, heating the flue gas to the temperature of 250 ℃ through a flue gas heat exchanger, then, heating the flue gas to the temperature of 280 ℃ through a hot blast stove, entering a denitration reactor, then, cooling the flue gas to the temperature of 130 ℃ through the flue gas heat exchanger again, and then, discharging the flue gas from a chimney through a draught fan.
Compared with the prior art, the invention has the advantages that:
compared with the traditional desulfurization, denitrification and whitening process system behind the sintering machine, the process system and the method for preventing low-temperature corrosion of the bypass preheating flue gas heat exchanger (GGH) of the hot blast stove can obviously prolong the service life of key equipment (namely the flue gas heat exchanger) for heating flue gas, and meanwhile, because the hot blast stove is necessary equipment in the desulfurization, denitrification and whitening process flow behind the sintering machine, the invention does not need to increase additional investment, and can also realize the purpose of fully utilizing the heat energy generated by the hot blast stove.
Drawings
FIG. 1 is a schematic diagram of a low temperature corrosion prevention process system for a bypass preheating flue gas heat exchanger of a hot blast stove.
FIG. 2 is a detailed schematic design of the hot blast stove system of FIG. 1.
Wherein:
hot-blast stove 1
Burner 2
Flue mixing chamber 3
Fuel pipe 4
Main air duct 5
Orifice plate flowmeter 6
Manual shut-off valve 7
Pressure gauge 8
High and low switch 9 for gas pressure
Fuel pressure transmitter 10
First pneumatic shut-off valve 11
Second pneumatic shut-off valve 12
Electric control valve 13
Venting pipe 14
Manual vent valve 15
Pneumatic blow-down valve 16
Combustion-supporting air pressure switch 17
Combustion fan 18
Air distribution port 19
Air distribution pipeline 20
Air distribution fan 21
Ignition manifold 22
Liquefied petroleum gas 23
First ignition hand valve 24
Ignition pneumatic valve 25
Ignition branch 26
Second ignition hand valve 27
Ignition gun 28
First temperature monitoring point 29
Second temperature monitoring point 30
Third temperature monitoring point 31
Fourth temperature monitoring Point 32
Hearth pressure measurement point 33
Flame detector 34
Blast furnace gas 35.
Description of the embodiments
The invention is described in further detail below with reference to the embodiments of the drawings.
As shown in fig. 1 and fig. 2, a low-temperature corrosion prevention process system for a preheating flue gas heat exchanger of a hot blast stove bypass in the embodiment comprises a hot blast stove system and a flue gas heat exchanger, wherein the flue gas heat exchanger comprises a first flue gas inlet, a first flue gas outlet, a second flue gas inlet and a second flue gas outlet, the first flue gas inlet is connected with a first flue gas inlet pipeline, the inlet of the first flue gas inlet pipeline is connected with sintering plant flue gas, an electrostatic precipitator, a main exhaust fan, a desulfurization system and a white-removing condensation system are sequentially arranged on the first flue gas inlet pipeline, a first flue gas outlet pipeline is connected between the first flue gas outlet and the hot blast stove system, a second flue gas inlet pipeline is connected between the hot blast stove system and the second flue gas inlet pipeline, a denitration reactor is arranged on the second flue gas inlet pipeline, the second flue gas outlet pipeline is connected with a second flue gas outlet pipeline, the outer end of the second flue gas inlet pipeline is connected to a chimney, a bypass flue is connected between the second flue gas inlet pipeline and the first flue gas inlet pipeline, one end of the bypass is connected to the denitration reactor, and the other end of the bypass flue gas inlet pipeline is connected between the denitration reactor and the white-removing condensation system;
an ammonia pipeline is connected and arranged on a second smoke inlet pipeline between the hot blast stove system and the denitration reactor, the outer end of the ammonia pipeline is connected with an ammonia area, and an ammonia water evaporator is arranged on the ammonia pipeline;
an induced draft fan is arranged on the second smoke exhaust pipeline;
the hot blast stove system comprises a hot blast stove 1 and a combustor 2, a flue mixing chamber 3 is arranged above the hot blast stove 1, the flue mixing chamber 3 comprises two inlets and an outlet, one inlet is connected with a first smoke exhaust pipeline, the other inlet is connected with a smoke outlet of the hot blast stove 1, the outlet is connected with a second smoke inlet pipeline, and a bypass flue is arranged on the second smoke inlet pipeline;
the burner 2 is respectively connected with a fuel pipeline 4 and a main air pipeline 5, an inlet of the fuel pipeline 4 is connected with blast furnace gas 35, an orifice plate flowmeter 6, a manual cut-off valve 7, a pressure gauge 8, a gas pressure high-low switch 9, a fuel pressure transmitter 10, a first pneumatic cut-off valve 11, a second pneumatic cut-off valve 12 and an electric regulating valve 13 are sequentially arranged on the fuel pipeline 4, a vent pipeline 14 is arranged between the first pneumatic cut-off valve 11 and the second pneumatic cut-off valve 12, a manual vent valve 15 and a pneumatic vent valve 16 are arranged on the vent pipeline 14, and a combustion air pressure switch 17 and a combustion fan 18 are arranged on the main air pipeline 5;
an air distribution port 19 is arranged on the hot blast stove 1, an air distribution pipeline 20 is arranged between the first smoke exhaust pipeline and the air distribution port 19, and an air distribution fan 21 is arranged on the air distribution pipeline 20;
an ignition system is arranged in the hot blast stove 1 and comprises an ignition main pipe 22, an inlet of the ignition main pipe 22 is connected with liquefied petroleum gas 23, a first ignition hand valve 24 and an ignition pneumatic valve 25 are sequentially arranged on the ignition main pipe 22, an outlet of the ignition main pipe 22 is divided into a plurality of ignition branch pipes 26, and a second ignition hand valve 27 and an ignition gun 28 are sequentially arranged on each ignition branch pipe 26;
a first temperature monitoring point 29 is arranged on one side of the furnace body of the hot blast stove 1 and used for measuring the temperature of a hearth;
a second temperature monitoring point 30 is arranged at the position of the smoke outlet of the hot blast stove 1 and is used for measuring the temperature of hot blast;
a third temperature monitoring point 31 is arranged on the first smoke exhaust pipeline and is used for measuring the temperature of low-temperature smoke exhausted by the smoke heat exchanger;
a fourth temperature monitoring point 32 is arranged on the second smoke inlet pipeline and is used for measuring the temperature of the mixed smoke;
the air distribution fan 21 is connected with a second temperature monitoring point 30 and a third temperature monitoring point 31 through lines;
the fourth temperature monitoring point 32 is respectively connected with the combustion-supporting fan 18 and the electric regulating valve 13 through lines;
one side of the hot blast stove 1 is also provided with a hearth pressure measuring point 33;
the burner 2 is provided with a flame detector 34.
The flue gas exhausted by the sintering plant sequentially passes through an electrostatic precipitator, a main exhaust fan, a desulfurization system and a whitening condensing system, and the temperature of the flue gas discharged by the whitening condensing system is about 45 ℃; in order to reach the temperature required by the denitration catalyst, the flue gas needs to be reheated by a flue gas heat exchanger; however, as the temperature of the flue gas from the whitening condensing system is lower than the dew point temperature of sulfuric acid, the flue gas directly enters the flue gas heat exchanger to cause the low-temperature corrosion phenomenon of the heat exchanger;
step two, introducing the flue gas of the hot blast stove into a flue after the whitening condensing system through a bypass flue, and heating the flue gas discharged from the whitening condensing system to about 100 ℃ (the dew point temperature of sulfuric acid is higher), thereby avoiding the corrosion phenomenon of the flue gas of a flue gas heat exchanger;
and thirdly, heating the flue gas from the whitening condensing system through a bypass flue, then, enabling the flue gas to enter a flue gas heat exchanger to raise the temperature of the flue gas to about 250 ℃, then, raising the temperature of the flue gas to about 280 ℃ through a hot blast stove, entering a denitration reactor, then, cooling the temperature of the flue gas to about 130 ℃ through the flue gas heat exchanger again, and discharging the flue gas from a chimney through a draught fan.
In addition to the above embodiments, the present invention also includes other embodiments, and all technical solutions that are formed by equivalent transformation or equivalent substitution should fall within the protection scope of the claims of the present invention.
Claims (7)
1. A hot blast stove bypass preheats flue gas heat exchanger and prevents low temperature corrosion process system, its characterized in that: the flue gas heat exchanger comprises a first flue gas inlet, a first flue gas outlet, a second flue gas inlet and a second flue gas outlet, wherein the first flue gas inlet is connected with a first flue gas inlet pipeline, the inlet of the first flue gas inlet pipeline is connected with sintering plant flue gas, an electrostatic precipitator, a main exhaust fan, a desulfurization system and a white-removal condensing system are sequentially arranged on the first flue gas inlet pipeline, a first flue gas outlet pipeline is connected between the first flue gas outlet pipeline and the hot blast furnace system, a second flue gas inlet pipeline is connected between the hot blast furnace system and the second flue gas inlet pipeline, a denitration reactor is arranged on the second flue gas inlet pipeline, a second flue gas outlet pipeline is connected, the outer end of the second flue gas outlet pipeline is connected to a chimney, a draught fan is arranged on the second flue gas inlet pipeline, a bypass is connected between the second flue gas inlet pipeline and the first flue, one end of the bypass is connected between the hot blast furnace system and the denitration reactor, and the other end of the bypass flue is connected between the white-removal condensing system and the flue gas heat exchanger;
an ammonia pipeline is connected and arranged on a second smoke inlet pipeline between the hot blast stove system and the denitration reactor, the outer end of the ammonia pipeline is connected with an ammonia area, and an ammonia water evaporator is arranged on the ammonia pipeline;
the hot-blast stove system comprises a hot-blast stove and a burner, a flue mixing chamber is arranged above the hot-blast stove, the flue mixing chamber comprises two inlets and an outlet, one inlet is connected with a first smoke exhaust pipeline, the other inlet is connected with a hot-blast stove smoke outlet, the outlet is connected with a second smoke inlet pipeline, and a bypass flue is arranged on the second smoke inlet pipeline.
2. A hot blast stove bypass preheating flue gas heat exchanger low temperature corrosion prevention process system according to claim 1, wherein: the burner is characterized in that a fuel pipeline and a main air pipeline are respectively connected to the burner, an inlet of the fuel pipeline is connected with blast furnace gas, an orifice flowmeter, a manual cut-off valve, a pressure gauge, a gas pressure high switch, a gas pressure low switch, a fuel pressure transmitter, a first pneumatic cut-off valve, a second pneumatic cut-off valve and an electric regulating valve are sequentially arranged on the fuel pipeline, an emptying pipeline is arranged between the first pneumatic cut-off valve and the second pneumatic cut-off valve, a manual emptying valve and a pneumatic emptying valve are arranged on the emptying pipeline, and a combustion-supporting air pressure switch and a combustion-supporting fan are arranged on the main air pipeline.
3. A hot blast stove bypass preheating flue gas heat exchanger low temperature corrosion prevention process system according to claim 1, wherein: an air distribution port is arranged on the hot blast stove, an air distribution pipeline is arranged between the first smoke exhaust pipeline and the air distribution port, and an air distribution fan is arranged on the air distribution pipeline.
4. A hot blast stove bypass preheating flue gas heat exchanger low temperature corrosion prevention process system according to claim 1, wherein: the hot blast stove is internally provided with an ignition system, the ignition system comprises an ignition main pipe, an inlet of the ignition main pipe is connected with liquefied petroleum gas, a first ignition hand valve and an ignition pneumatic valve are sequentially arranged on the ignition main pipe, an outlet of the ignition main pipe is divided into a plurality of ignition branch pipes, and a second ignition hand valve and an ignition gun are sequentially arranged on each ignition branch pipe.
5. A hot blast stove bypass preheating flue gas heat exchanger low temperature corrosion prevention process system according to claim 3, wherein: the hot-blast stove furnace body one side is provided with first temperature monitoring point, hot-blast stove exhaust port position department is provided with the second temperature monitoring point, be provided with the third temperature monitoring point on the first exhaust pipe, be provided with the fourth temperature monitoring point on the second advances the cigarette pipeline.
6. The hot blast stove bypass preheating flue gas heat exchanger low temperature corrosion prevention process system according to claim 5, wherein: the air distribution fan is connected with the second temperature monitoring point and the third temperature monitoring point through lines; and the fourth temperature monitoring point is respectively connected with the combustion-supporting fan and the electric regulating valve through circuits.
7. The process method for preventing low-temperature corrosion of the bypass preheating flue gas heat exchanger of the hot blast stove is characterized by comprising the following steps of:
step one, flue gas exhausted by a sintering plant sequentially passes through an electrostatic precipitator, a main exhaust fan, a desulfurization system and a whitening condensing system, and the temperature of the flue gas from the whitening condensing system is 45 ℃;
step two, introducing the flue gas of the hot blast stove into a flue after the whitening condensing system through a bypass flue, and heating the flue gas coming out of the whitening condensing system to 100 ℃;
and thirdly, heating the flue gas from the whitening condensing system through a bypass flue, then, heating the flue gas to the temperature of 250 ℃ through a flue gas heat exchanger, then, heating the flue gas to the temperature of 280 ℃ through a hot blast stove, entering a denitration reactor, then, cooling the flue gas to the temperature of 130 ℃ through the flue gas heat exchanger again, and then, discharging the flue gas from a chimney through a draught fan.
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| CN201910608734.0A CN110260348B (en) | 2019-07-08 | 2019-07-08 | Low-temperature corrosion prevention process system and method for bypass preheating flue gas heat exchanger of hot blast stove |
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| CN201910608734.0A CN110260348B (en) | 2019-07-08 | 2019-07-08 | Low-temperature corrosion prevention process system and method for bypass preheating flue gas heat exchanger of hot blast stove |
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| CN110260348B true CN110260348B (en) | 2024-04-16 |
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2019
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| CN108479332A (en) * | 2018-04-16 | 2018-09-04 | 天津华赛尔传热设备有限公司 | A kind of low-temperature flue gas desulphurization denitration disappears white system |
| CN108706671A (en) * | 2018-08-02 | 2018-10-26 | 山东国舜建设集团有限公司 | A kind of desulfurization wastewater self-preheating type evaporation technology using sintering machine high-temperature flue gas |
| CN109432936A (en) * | 2018-12-04 | 2019-03-08 | 中冶南方都市环保工程技术股份有限公司 | Sintering flue gas processing method and processing system |
| CN109883211A (en) * | 2019-03-29 | 2019-06-14 | 中冶华天工程技术有限公司 | Sintering flue gas heating device |
| CN210425080U (en) * | 2019-07-08 | 2020-04-28 | 江苏朗润环保科技有限公司 | Low-temperature corrosion prevention process system for bypass preheating flue gas heat exchanger of hot blast stove |
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