CN210425080U - Low-temperature corrosion prevention process system for bypass preheating flue gas heat exchanger of hot blast stove - Google Patents
Low-temperature corrosion prevention process system for bypass preheating flue gas heat exchanger of hot blast stove Download PDFInfo
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- CN210425080U CN210425080U CN201921052256.1U CN201921052256U CN210425080U CN 210425080 U CN210425080 U CN 210425080U CN 201921052256 U CN201921052256 U CN 201921052256U CN 210425080 U CN210425080 U CN 210425080U
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Abstract
The utility model relates to a hot-blast furnace bypass preheats gas heater and prevents low temperature corrosion process systems, it includes hot-blast furnace system and gas heater, gas heater includes that first inlet flue, first exhaust port, second inlet flue and second exhaust port, first inlet flue department connects and is provided with first smoke pipe way, first smoke pipe way entry linkage sintering plant's flue gas of advancing, it is provided with first exhaust pipe way to be connected between first exhaust port and the hot-blast furnace system, hot-blast furnace system and second are advanced to be connected between the flue and are provided with the second and advance the smoke pipe way, the second exhaust port is connected and is provided with the second exhaust pipe way, the second advances to be connected between smoke pipe way and the first smoke pipe way and be provided with the bypass flue. The utility model discloses can show the life who improves the key equipment of flue gas heating, consequently need not to increase extra investment, also can realize the purpose of the produced heat energy of make full use of hot-blast furnace simultaneously.
Description
Technical Field
The utility model relates to a hot-blast furnace bypass preheats gas heater (GGH) and prevents low temperature corrosion process systems belongs to sintering flue gas processing technology field.
Background
Sintering machine is the largest SO of iron and steel plant2And NOXThe emission source is that a considerable part of air (40-50%) does not pass through the sinter bed, so that the amount of sintering flue gas is greatly increased, and 4000-6000 m is produced for every 1 ton of sintering ore3(working condition) flue gas. Meanwhile, the flue gas has large moisture content and higher dew point temperature. In order to improve the air permeability of the sintering mixture, a proper amount of water must be added into the mixture to prepare pellets before sintering, so the moisture content of the dust-containing flue gas is large, and the moisture content is generally between 8 and 12 percent and even up to 15 percent in terms of volume ratio; the dew point temperature is between 65 and 80 ℃.
The problem of low-temperature corrosion commonly exists in the flue gas heat exchanger of the existing steel plant, which is because the dew point temperature of sulfuric acid is usually about 100 ℃, and the temperature of the flue gas treated by a desulfurizing tower or a de-whitening tower is obviously lower than the dew point temperature of the sulfuric acid, so that sulfuric acid vapor carried in the flue gas is condensed and deposited on the surface of the flue gas heat exchanger to cause low-temperature corrosion.
Most steel plants or power plants at the present stage do not have good solutions to 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 select to use corrosion-resistant materials to manufacture the flue gas heat exchanger, so that the corrosion-resistant effect is improved, the cost is increased, and the air leakage coefficient is increased. Some iron and steel plants choose to add additives into the flue gas to neutralize SO3In order to avoid low temperature corrosion, but this leads to increased operating costs, while also allowing for removal of the neutralized product.
Therefore, it is urgent to provide a technical means for preventing low-temperature corrosion of the flue gas heat exchanger with low investment and high efficiency.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a hot-blast furnace bypass preheats gas heater (GGH) and prevents low temperature corrosion process systems is provided to above-mentioned prior art, SOx/NOx control after traditional sintering machine takes off white process systems and compares, can show the key equipment that improves the flue gas heating, gas heater (GGH)'s life promptly, simultaneously because the hot-blast furnace carries out SOx/NOx control behind the sintering machine and takes off essential equipment in the white process flow, consequently need not to increase extra investment, also can realize the purpose of the produced heat energy of make full use of hot-blast furnace simultaneously.
The utility model provides a technical scheme that above-mentioned problem adopted does: a hot blast stove bypass preheating flue gas heat exchanger low-temperature corrosion prevention process system comprises a hot blast stove system and a flue gas heat exchanger, wherein the flue gas heat exchanger comprises a first smoke inlet, a first smoke exhaust port, a second smoke inlet and a second smoke exhaust port, the first smoke inlet is provided with a first smoke inlet pipeline in a connected mode, the first smoke inlet pipeline is connected with flue gas of a sintering plant, an electrostatic dust collector, a main exhaust fan, a desulfurization system and a whitening condensation system are sequentially arranged on the first smoke inlet pipeline, a first smoke exhaust pipeline is arranged between the first smoke exhaust port and the hot blast stove system in a connected mode, a second smoke inlet pipeline is arranged between the hot blast stove system and the second smoke inlet in a connected mode, a denitration reactor is arranged on the second smoke inlet pipeline, a second smoke exhaust pipeline is arranged at the second smoke exhaust port in a connected mode, the outer end of the second smoke exhaust pipeline is connected to a chimney, and a denitration induced draft fan is arranged on the second smoke exhaust pipeline, and a bypass flue is connected between the second smoke inlet pipeline and the first smoke inlet pipeline, one end of the bypass flue is connected between the hot blast stove system and the denitration reactor, and the other end of the bypass flue is connected between the whiting condensation system and the smoke heat exchanger.
Furthermore, an ammonia gas 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 gas pipeline is connected with an ammonia area, and an ammonia water evaporator is arranged on the ammonia gas pipeline.
Furthermore, 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 the first smoke exhaust pipeline, the other inlet is connected with a smoke outlet of the hot blast stove, the outlet is connected with the second smoke intake pipeline, and the second smoke intake pipeline is provided with a bypass flue.
Furthermore, a fuel pipeline and a main air pipeline are respectively connected and arranged on the combustor, the inlet of the fuel pipeline is connected with blast furnace gas, a pore plate flowmeter, a manual cut-off valve, a pressure gauge, a high and low gas pressure 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;
furthermore, 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.
Furthermore, be provided with ignition system in the heating furnace, ignition system includes the ignition house steward, ignition house steward entry linkage 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 falls into a plurality of ignition branch pipes, has set gradually second ignition hand valve and ignition gun on every ignition branch pipe.
Furthermore, a first temperature monitoring point is arranged on one side of the heating furnace body, a second temperature monitoring point is arranged at the position of the smoke outlet of the heating furnace, a third temperature monitoring point is arranged on the first smoke exhaust pipeline, and a fourth temperature monitoring point is arranged on the second smoke inlet pipeline.
Furthermore, the air distribution fan is connected with a second temperature monitoring point and a third temperature monitoring point through a line; and the fourth temperature monitoring point is respectively connected with a combustion fan and an electric regulating valve through lines.
Compared with the prior art, the utility model has the advantages of:
the utility model relates to a flue gas heat exchanger (GGH) is preheated to hot-blast furnace bypass prevents low temperature corrosion process systems, and SOx/NOx control after traditional sintering machine takes off white process systems and compares, can show the life who improves the key equipment of flue gas heating (flue gas heat exchanger promptly), simultaneously because the hot-blast furnace carries out SOx/NOx control behind the sintering machine and takes off necessary equipment in the white process flow, consequently need not to increase extra investment, also can realize the purpose of the produced heat energy of make full use of hot-blast furnace simultaneously.
Drawings
Fig. 1 is the schematic diagram of the low-temperature corrosion preventing process system of the preheating flue gas heat exchanger of the hot blast stove bypass.
Fig. 2 is a detailed design diagram of the hot blast stove system of fig. 1.
Wherein:
hot-blast stove 1
Burner 2
Orifice flowmeter 6
Manual shut-off valve 7
Pressure gauge 8
Gas pressure high and low switch 9
First pneumatic shut-off valve 11
Second pneumatic shut-off valve 12
Emptying pipe 14
Manual air release valve 15
Pneumatic blow-off valve 16
Combustion-supporting air pressure switch 17
First ignition hand valve 24
Ignition pneumatic valve 25
Second ignition hand valve 27
First temperature monitoring point 29
Second temperature monitoring Point 30
Third temperature monitoring point 31
Fourth temperature monitoring Point 32
Furnace pressure measuring point 33
Flame detector 34
Detailed Description
The present invention will be described in further detail with reference to the following embodiments.
As shown in fig. 1 and fig. 2, the process system for preventing low temperature corrosion of a bypass preheating flue gas heat exchanger of a hot blast stove in the embodiment includes a hot blast stove system and a flue gas heat exchanger, the flue gas heat exchanger includes 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 pipe, an inlet of the first flue gas inlet pipe is connected with flue gas of a sintering plant, an electrostatic dust collector, a main exhaust fan, a desulfurization system and a whitening condensation system are sequentially arranged on the first flue gas inlet pipe, a first flue gas outlet is connected between the first flue gas outlet and the hot blast stove system, a second flue gas inlet pipe is connected between the hot blast stove system and the second flue gas inlet, a denitration reactor is arranged on the second flue gas inlet pipe, a second flue gas outlet is connected with a second flue gas discharge pipe, an outer end of the second flue gas discharge pipe is connected to a chimney, a bypass flue is connected between the second smoke inlet pipeline and the first smoke inlet pipeline, one end of the bypass flue is connected between the hot blast stove system and the denitration reactor, and the other end of the bypass flue is connected between the whiting condensation system and the smoke heat exchanger;
an ammonia gas 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 gas pipeline is connected with an ammonia area, and an ammonia water evaporator is arranged on the ammonia gas pipeline;
a denitration induced draft fan is arranged on the second smoke exhaust pipeline;
the hot blast stove system comprises a hot blast stove 1 and a burner 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 combustor 2 is respectively connected with a fuel pipeline 4 and a main air pipeline 5, the inlet of the fuel pipeline 4 is connected with blast furnace gas 35, the fuel pipeline 4 is sequentially provided with a pore plate flowmeter 6, a manual cut-off valve 7, a pressure gauge 8, a high and low gas pressure 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, an emptying pipeline 14 is arranged between the first pneumatic cut-off valve 11 and the second pneumatic cut-off valve 12, the emptying pipeline 14 is provided with a manual emptying valve 15 and a pneumatic emptying valve 16, and the main air pipeline 5 is provided with a combustion-supporting air pressure switch 17 and a combustion-supporting fan 18;
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 heating furnace 1, the ignition system comprises an ignition main pipe 22, the 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, the outlet of the ignition main pipe 22 is divided into a plurality of ignition branch pipes 26, and each ignition branch pipe 26 is sequentially provided with a second ignition hand valve 27 and an ignition gun 28;
a first temperature monitoring point 29 is arranged on one side of the furnace body of the heating furnace 1 and used for measuring the temperature of the hearth;
a second temperature monitoring point 30 is arranged at the position of the smoke outlet of the heating furnace 1 and is used for measuring the temperature of hot air;
the first smoke exhaust pipeline is provided with a third temperature monitoring point 31 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 a line;
the fourth temperature monitoring point 32 is respectively connected with the combustion fan 18 and the electric regulating valve 13 through lines;
a hearth pressure measuring point 33 is also arranged on one side of the hot blast stove 1;
a flame detector 34 is provided on the burner 2.
The specific method comprises the following steps:
firstly, smoke discharged from a sintering plant sequentially passes through an electrostatic dust collector, a main exhaust fan, a desulfurization system and a whitening condensation system, and the temperature of the smoke discharged from the whitening condensation 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, the temperature of the flue gas coming out of the de-whitening condensation system is lower than the dew point temperature of sulfuric acid, and the flue gas directly enters a flue gas heat exchanger to cause the low-temperature corrosion phenomenon of the heat exchanger;
secondly, the flue gas of the hot blast stove is introduced into a flue behind a de-whitening condensation system through a bypass flue, and the flue gas from the de-whitening condensation system is heated to about 100 ℃ (above the dew point temperature of sulfuric acid), so that the flue corrosion phenomenon of a flue gas heat exchanger is avoided;
and step three, heating the flue gas from the de-whitening condensation system through a bypass flue, then introducing the flue gas into a flue gas heat exchanger to raise the temperature of the flue gas to about 250 ℃, then introducing the flue gas into a denitration reactor after the temperature of the flue gas is raised to about 280 ℃ through a hot blast stove, then reducing 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 denitration induced draft fan.
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 (8)
1. The utility model provides a hot-blast furnace bypass preheats gas heater and prevents low temperature corrosion process systems which characterized in that: the system 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 smoke exhaust port, a second flue gas inlet and a second smoke exhaust port, the first flue gas inlet is connected with a first smoke inlet pipeline, the inlet of the first smoke inlet pipeline is connected with flue gas of a sintering plant, an electrostatic dust collector, a main exhaust fan, a desulfurization system and a whitening condensation system are sequentially arranged on the first smoke inlet pipeline, a first smoke exhaust pipeline is connected and arranged between the first smoke exhaust port and the hot blast stove system, a second smoke inlet pipeline is connected and arranged between the hot blast stove system and the second flue gas inlet, a denitration reactor is arranged on the second smoke inlet pipeline, a second smoke exhaust pipeline is connected and arranged at the second smoke exhaust port, the outer end of the second smoke exhaust pipeline is connected to a chimney, a denitration induced draft fan is arranged on the second smoke inlet pipeline, a bypass flue is connected and arranged between the second smoke inlet pipeline and the first smoke inlet pipeline, and one end of the bypass flue is connected between the hot blast furnace system and the denitration reactor, and the other end of the bypass flue is connected between the de-whitening condensation system and the flue gas heat exchanger.
2. The process system for preventing low-temperature corrosion of the bypass preheating flue gas heat exchanger of the hot blast stove according to claim 1, characterized in that: and an ammonia gas 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 gas pipeline is connected with an ammonia area, and an ammonia water evaporator is arranged on the ammonia gas pipeline.
3. The process system for preventing low-temperature corrosion of the bypass preheating flue gas heat exchanger of the hot blast stove according to claim 1, characterized in that: the hot blast stove system comprises a hot blast stove and a burner, a flue mixing chamber is arranged above the hot blast stove and comprises two inlets and an outlet, one of the inlets is connected with a first smoke exhaust pipeline, the other inlet is connected with a smoke exhaust port of the hot blast stove, the outlet is connected with a second smoke inlet pipeline, and the second smoke inlet pipeline is provided with a bypass flue.
4. The process system for preventing low-temperature corrosion of the bypass preheating flue gas heat exchanger of the hot blast stove according to claim 3, characterized in that: the combustor is provided with a fuel pipeline and a main air pipeline in a connected mode respectively, a fuel pipeline inlet is connected with blast furnace gas, a pore plate flowmeter, a manual cut-off valve, a pressure gauge, a gas pressure switch, a fuel pressure transmitter, a first pneumatic cut-off valve, a second pneumatic cut-off valve and an electric control 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.
5. The process system for preventing low-temperature corrosion of the bypass preheating flue gas heat exchanger of the hot blast stove according to claim 3, characterized in that: 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.
6. The process system for preventing low-temperature corrosion of the bypass preheating flue gas heat exchanger of the hot blast stove according to claim 3, characterized in that: be provided with ignition system in the hot-blast furnace, ignition system includes ignition house steward, ignition house steward entry linkage 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 falls into a plurality of ignition branch pipes, has set gradually second ignition hand valve and ignition gun on every ignition branch pipe.
7. The process system for preventing low-temperature corrosion of the bypass preheating flue gas heat exchanger of the hot blast stove according to claim 5, characterized in that: the hot blast stove is characterized in that a first temperature monitoring point is arranged on one side of the hot blast stove body, a second temperature monitoring point is arranged at the position of an exhaust port of the hot blast stove, a third temperature monitoring point is arranged on the first smoke exhaust pipeline, and a fourth temperature monitoring point is arranged on the second smoke inlet pipeline.
8. The process system for preventing low-temperature corrosion of the bypass preheating flue gas heat exchanger of the hot blast stove according to claim 7, characterized in that: the air distribution fan is connected with a second temperature monitoring point and a third temperature monitoring point through a line; and the fourth temperature monitoring point is respectively connected with a combustion fan and an electric regulating valve through lines.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921052256.1U CN210425080U (en) | 2019-07-08 | 2019-07-08 | Low-temperature corrosion prevention process system for bypass preheating flue gas heat exchanger of hot blast stove |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921052256.1U CN210425080U (en) | 2019-07-08 | 2019-07-08 | Low-temperature corrosion prevention process system for bypass preheating flue gas heat exchanger of hot blast stove |
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| CN210425080U true CN210425080U (en) | 2020-04-28 |
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| CN201921052256.1U Active CN210425080U (en) | 2019-07-08 | 2019-07-08 | Low-temperature corrosion prevention process system for bypass preheating flue gas heat exchanger of hot blast stove |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110260348A (en) * | 2019-07-08 | 2019-09-20 | 江苏朗润环保科技有限公司 | Hot-blast stove bypass preheating flue gas heat-exchange unit prevents low-temperature corrosion process system and method |
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2019
- 2019-07-08 CN CN201921052256.1U patent/CN210425080U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110260348A (en) * | 2019-07-08 | 2019-09-20 | 江苏朗润环保科技有限公司 | Hot-blast stove bypass preheating flue gas heat-exchange unit prevents low-temperature corrosion process system and method |
| CN110260348B (en) * | 2019-07-08 | 2024-04-16 | 江苏朗润环保科技有限公司 | Low-temperature corrosion prevention process system and method for bypass preheating flue gas heat exchanger of hot blast stove |
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