CN110260348A - Hot-blast stove bypass preheating flue gas heat-exchange unit prevents low-temperature corrosion process system and method - Google Patents
Hot-blast stove bypass preheating flue gas heat-exchange unit prevents low-temperature corrosion process system and method Download PDFInfo
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- CN110260348A CN110260348A CN201910608734.0A CN201910608734A CN110260348A CN 110260348 A CN110260348 A CN 110260348A CN 201910608734 A CN201910608734 A CN 201910608734A CN 110260348 A CN110260348 A CN 110260348A
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- hot
- blast stove
- exchange unit
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 87
- 239000003546 flue gas Substances 0.000 title claims abstract description 87
- 238000000034 method Methods 0.000 title claims abstract description 32
- 238000005260 corrosion Methods 0.000 title claims abstract description 26
- 230000007797 corrosion Effects 0.000 title claims abstract description 25
- 230000008569 process Effects 0.000 title claims abstract description 21
- 239000000779 smoke Substances 0.000 claims abstract description 60
- 238000007599 discharging Methods 0.000 claims abstract description 22
- 238000005245 sintering 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
- 239000000446 fuel Substances 0.000 claims description 14
- 229910021529 ammonia Inorganic materials 0.000 claims description 12
- 238000002485 combustion reaction Methods 0.000 claims description 11
- 239000007789 gas Substances 0.000 claims description 9
- 238000010438 heat treatment Methods 0.000 claims description 9
- 230000008676 import Effects 0.000 claims description 9
- 238000002156 mixing Methods 0.000 claims description 7
- 235000019504 cigarettes Nutrition 0.000 claims description 6
- 239000012717 electrostatic precipitator Substances 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
- 239000007921 spray Substances 0.000 claims 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 10
- 229910000831 Steel Inorganic materials 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 238000009833 condensation Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 238000009770 conventional sintering Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000003009 desulfurizing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- 230000009466 transformation Effects 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
Bypassing preheating flue gas heat-exchange unit the present invention relates to a kind of hot-blast stove prevents low-temperature corrosion process system and method, the system comprises hot blast stove systems and flue gas heat-exchange unit, the flue gas heat-exchange unit includes the first smoke inlet, first smoke outlet, second smoke inlet and the second smoke outlet, the first smoke-intake pipe road is connected at first smoke inlet, first smoke-intake pipe road entrance connects sintering plant flue gas, the first smoke discharging pipe is connected between first smoke outlet and hot blast stove system, the second smoke-intake pipe road is connected between the hot blast stove system and the second smoke inlet, second smoke outlet is connected with the second smoke discharging pipe, bypass flue is connected between second smoke-intake pipe road and the first smoke-intake pipe road.The present invention can significantly improve the service life of the key equipment of flue gas, there is no need to increase additional investment, while also may be implemented to make full use of the purpose of thermal energy caused by hot-blast stove.
Description
Technical field
Bypassing preheating flue gas heat-exchange unit (GGH) the present invention relates to a kind of hot-blast stove prevents low-temperature corrosion process system and side
Method belongs to sintering flue gas processing technology field.
Background technique
Sintering machine is the maximum SO of steel plant2And NOXEmission source has quite a few air (40%~50%) not lead to
The oversintering bed of material greatly increases sintering flue gas amount, every to generate 1 ton of 4000~6000m of sinter generation3(operating condition) flue gas.Together
When humidity of flue gas it is big, dew-point temperature is higher.In order to improve the gas permeability of sinter mixture, mixture must add suitable before sintering
Bead is made in the water of amount, so the water capacity of ash-laden gas is larger, calculates by volume, moisture content is generally 8%~12%
Between, even as high as 15%；Dew-point temperature is between 65 DEG C~80 DEG C.
The problem of generally existing low-temperature corrosion of the flue gas heat-exchange unit of steel plant at present, this is because the dew-point temperature of sulfuric acid is logical
Often at 100 DEG C or so, the temperature of flue gas is substantially less than the dew-point temperature of sulfuric acid after desulfurizing tower or the processing of de- White Tower, thus cigarette
Entrained sulfuric acid vapor is condensed in gas, and being deposited on flue gas heat-exchange unit surface leads to low-temperature corrosion.
Most of steel plant or power plant do not have very good solution method for the low-temperature corrosion of flue gas heat-exchange unit at this stage, lead
Cause the universal service life of flue gas heat-exchange unit shorter, failure rate is higher.In order to solve this problem, some steel plant's selections use corrosion-resistant
Material production flue gas heat-exchange unit although improving anti-corrosion effect will lead to increased costs, air leakage coefficient becomes larger.Some steel
Additive is added in ironworks selection in flue gas, neutralizes SO with this3, from avoiding low-temperature corrosion, but it will lead to the increase of operating cost,
The removal of consideration neutralized reaction product is also needed simultaneously.
It is therefore proposed that a kind of avoided Low investment, the efficient technological means for preventing flue gas heat-exchange unit low-temperature corrosion
It is extremely urgent.
Summary of the invention
The technical problem to be solved by the present invention is to provide a kind of hot-blast stove bypass pre- hot fume for the above-mentioned prior art
Heat exchanger (GGH) prevents low-temperature corrosion process system and method, takes off white process system phase with the desulphurization denitration after conventional sintering machine
Than the key equipment of flue gas, the i.e. service life of flue gas heat-exchange unit (GGH) can be significantly improved, simultaneously because hot-blast stove
It is to carry out desulphurization denitration after sintering machine to take off necessary equipment in white process flow, there is no need to increase additional investment, while
It may be implemented to make full use of the purpose of thermal energy caused by hot-blast stove.
The present invention solves the above problems used technical solution are as follows: a kind of hot-blast stove bypass preheating flue gas heat-exchange unit prevents
Low-temperature corrosion process system, it includes hot blast stove system and flue gas heat-exchange unit, and the flue gas heat-exchange unit includes the first smoke inlet, the
One smoke outlet, the second smoke inlet and the second smoke outlet, are connected with the first smoke-intake pipe road at first smoke inlet, and described
One smoke-intake pipe road entrance connects sintering plant flue gas, be disposed on first smoke-intake pipe road electrostatic precipitator, main exhauster,
Desulphurization system and Tuo Bai condenser system are connected with the first smoke discharging pipe between first smoke outlet and hot blast stove system,
The second smoke-intake pipe road is connected between the hot blast stove system and the second smoke inlet, second smoke-intake pipe is provided on road
Benitration reactor, second smoke outlet are connected with the second smoke discharging pipe, and second smoke discharging pipe outer end is connected to cigarette
Chimney is provided with denitration air-introduced machine on second smoke discharging pipe, connects between second smoke-intake pipe road and the first smoke-intake pipe road
It is provided with bypass flue, described bypass flue one end is connected between hot blast stove system and Benitration reactor, and the other end is connected to
It takes off between white condenser system and flue gas heat-exchange unit.
Further, ammonia is connected on the second smoke-intake pipe road between the hot blast stove system and Benitration reactor
Feed channel, ammonia pipeline outer end connect ammonia area, are provided with ammonia water evaporator on the ammonia pipeline.
Further, the hot blast stove system includes hot-blast stove and burner, is provided with flue above the hot-blast stove
Mixing chamber, the flue mixing chamber include two imports and one outlet, and one of import is connected with the first smoke discharging pipe,
Another import is connected with hot-blast stove smoke outlet, and outlet is connected with the second smoke-intake pipe road, and second smoke-intake pipe is set on road
It is equipped with bypass flue.
Further, it is separately connected on the burner and is provided with fuel channel and main air duct, the fuel channel
Entrance connects blast furnace gas, is disposed with orifice flowmeter, hand off valve, pressure gauge, gas pressure on the fuel channel
The high and low switch of power, fuel pressure transmitter, the first pneumatic cut-off valve, the second pneumatic cut-off valve and electric control valve, described first
Exhausting pipeline is provided between pneumatic cut-off valve and the second pneumatic cut-off valve, be provided on the exhausting pipeline manual vent valve and
Pneumatic emptying valve is provided with combustion air pressure switch and combustion fan on the main air duct；
Further, it is provided with air distribution outlet on the hot-blast stove, is arranged between first smoke discharging pipe and air distribution outlet
Air distribution pipeline is provided with air distribution blower on the air distribution pipeline.
Further, ignition system is provided in the heating furnace, the ignition system includes igniting general pipeline, the point
Fiery manifold entrance connects liquefied petroleum gas, and the first igniting hand valve and igniting pneumatic operated valve, institute are disposed on the igniting general pipeline
It states the outlet igniting general pipeline and is divided into multiple igniting branch pipes, be disposed with the second igniting hand valve and burning torch on each igniting branch pipe.
Further, the heating furnace body side is provided with the first temperature monitoring point, heating furnace smoke outlet position
The place of setting is provided with second temperature monitoring point, is provided with third temperature monitoring point on first smoke discharging pipe, and described second into cigarette
The 4th temperature monitoring point is provided on pipeline.
Further, the air distribution blower is connected by route with second temperature monitoring point and third temperature monitoring point
It connects；The 4th temperature monitoring point is connected with combustion fan and electric control valve respectively by route.
A kind of hot-blast stove bypass preheating flue gas heat-exchange unit prevents low-temperature corrosion process, and the method includes following steps
It is rapid:
Step 1: the flue gas of sintering plant discharge successively passes through electrostatic precipitator, main exhauster, desulphurization system and Tuo Bai condensation
System is at this time 45 DEG C from the flue-gas temperature that white condenser system comes out is taken off；
Step 2: the flue gas of hot-blast stove is guided in the flue after taking off white condenser system by bypass flue, it will be white from taking off
Cooling system comes out flue gas to 100 DEG C；
Step 3: take off the flue gas that white condenser system comes out enters flue gas heat-exchange unit for flue gas temperature after bypass flue heats
Degree is promoted to 250 DEG C, is promoted flue-gas temperature to 280 DEG C using hot-blast stove and is entered Benitration reactor, then again passes by
Flue-gas temperature is dropped to 130 DEG C by flue gas heat-exchange unit, is discharged using denitration air-introduced machine from chimney.
Compared with the prior art, the advantages of the present invention are as follows:
A kind of hot-blast stove bypass preheating flue gas heat-exchange unit (GGH) of the present invention prevents low-temperature corrosion process system and method, with
Desulphurization denitration after conventional sintering machine takes off white process system and compares, and can significantly improve key equipment (the i.e. flue gas of flue gas
Heat exchanger) service life, simultaneously because hot-blast stove is to carry out desulphurization denitration after sintering machine to take off necessary in white process flow set
It is standby, there is no need to increase additional investment, while it also may be implemented to make full use of the purpose of thermal energy caused by hot-blast stove.
Detailed description of the invention
Fig. 1 is the schematic diagram that a kind of hot-blast stove bypass preheating flue gas heat-exchange unit of the present invention prevents low-temperature corrosion process system.
Fig. 2 is the detailed design schematic diagram of hot blast stove system in Fig. 1.
Wherein:
Hot-blast stove 1
Burner 2
Flue mixing chamber 3
Fuel channel 4
Main air duct 5
Orifice flowmeter 6
Hand off valve 7
Pressure gauge 8
The high and low switch 9 of gaseous-pressure
Fuel pressure transmitter 10
First pneumatic cut-off valve 11
Second pneumatic cut-off valve 12
Electric control valve 13
Exhausting pipeline 14
Manual vent valve 15
Pneumatic emptying valve 16
Combustion air pressure switch 17
Combustion fan 18
Air distribution outlet 19
Air distribution pipeline 20
Air distribution blower 21
Light a fire general pipeline 22
Liquefied petroleum gas 23
First igniting hand valve 24
Igniting pneumatic operated valve 25
Igniting branch pipe 26
Second igniting hand valve 27
Burning torch 28
First temperature monitoring point 29
Second temperature monitoring point 30
Third temperature monitoring point 31
4th temperature monitoring point 32
Furnace pressure measuring point 33
Flame detector 34
Blast furnace gas 35.
Specific embodiment
The present invention will be described in further detail below with reference to the embodiments of the drawings.
As shown in Figure 1 and Figure 2, one of the present embodiment hot-blast stove bypass preheating flue gas heat-exchange unit prevents low-temperature corrosion work
Process system, it includes hot blast stove system and flue gas heat-exchange unit, the flue gas heat-exchange unit include the first smoke inlet, the first smoke outlet,
Second smoke inlet and the second smoke outlet are connected with the first smoke-intake pipe road, first smoke-intake pipe at first smoke inlet
Road entrance connects sintering plant flue gas, and first smoke-intake pipe is disposed with electrostatic precipitator, main exhauster, desulphurization system on road
With take off white condenser system, the first smoke discharging pipe, the hot wind are connected between first smoke outlet and hot blast stove system
The second smoke-intake pipe road is connected between furnace system and the second smoke inlet, second smoke-intake pipe is provided with denitration reaction on road
Device, second smoke outlet are connected with the second smoke discharging pipe, and second smoke discharging pipe outer end is connected to chimney, and described
Bypass flue is connected between two smoke-intake pipe roads and the first smoke-intake pipe road, described bypass flue one end is connected to hot-blast stove system
Between system and Benitration reactor, the other end, which is connected to, to be taken off between white condenser system and flue gas heat-exchange unit；
It is connected with ammonia pipeline on the second smoke-intake pipe road between the hot blast stove system and Benitration reactor, it is described
Ammonia pipeline outer end connects ammonia area, is provided with ammonia water evaporator on the ammonia pipeline；
Denitration air-introduced machine is provided on second smoke discharging pipe；
The hot blast stove system includes hot-blast stove 1 and burner 2, is provided with flue mixing chamber 3 above the hot-blast stove 1,
The flue mixing chamber 3 includes two imports and one outlet, and one of import is connected with the first smoke discharging pipe, another
Import is connected with 1 smoke outlet of hot-blast stove, and outlet is connected with the second smoke-intake pipe road, and second smoke-intake pipe is provided with side on road
Road flue；
It is separately connected on the burner 2 and is provided with fuel channel 4 and main air duct 5,4 entrance of the fuel channel connection
Blast furnace gas 35 is disposed with orifice flowmeter 6, hand off valve 7, pressure gauge 8, gaseous-pressure on the fuel channel 4
High and low switch 9, fuel pressure transmitter 10, the first pneumatic cut-off valve 11, the second pneumatic cut-off valve 12 and electric control valve 13,
It is provided with exhausting pipeline 14 between first pneumatic cut-off valve 11 and the second pneumatic cut-off valve 12, is set on the exhausting pipeline 14
It is equipped with manual vent valve 15 and Pneumatic emptying valve 16, is provided with combustion air pressure switch 17 and combustion air on the main air duct 5
Machine 18；
It is provided with air distribution outlet 19 on the hot-blast stove 1, aid distributing pipe is set between first smoke discharging pipe and air distribution outlet 19
Road 20 is provided with air distribution blower 21 on the air distribution pipeline 20；
Ignition system is provided in the heating furnace 1, the ignition system includes igniting general pipeline 22, the igniting general pipeline 22
Entrance connects liquefied petroleum gas 23, and the first igniting hand valve 24 and igniting pneumatic operated valve 25 are disposed on the igniting general pipeline 22,
The outlet igniting general pipeline 22 is divided into multiple igniting branch pipes 26, and the second igniting hand valve 27 is disposed on each igniting branch pipe 26
With burning torch 28；
The 1 furnace body side of heating furnace is provided with the first temperature monitoring point 29, for measuring fire box temperature；
It is provided with second temperature monitoring point 30 at 1 smoke vent position of heating furnace, for measuring hot blast temperature；
Third temperature monitoring point 31 is provided on first smoke discharging pipe, for measuring the low temperature of flue gas heat-exchange unit discharge
Flue-gas temperature；
The 4th temperature monitoring point 32 is provided on second smoke-intake pipe road, for measuring mixed flue-gas temperature；
The air distribution blower 21 is connected by route with second temperature monitoring point 30 and third temperature monitoring point 31；
The 4th temperature monitoring point 32 is connected with combustion fan 18 and electric control valve 13 respectively by route；
1 side of hot-blast stove is additionally provided with furnace pressure measuring point 33；
Flame detector 34 is provided on the burner 2.
The specific method is as follows:
Step 1: the flue gas of sintering plant discharge successively passes through electrostatic precipitator, main exhauster, desulphurization system and Tuo Bai condensation
System is 45 DEG C or so taking off the flue-gas temperature that white condenser system comes out；For temperature needed for reaching denitrating catalyst, need
Reheating is carried out to flue gas by flue gas heat-exchange unit；But it is lower due to taking off the flue-gas temperature that white condenser system comes out, it is lower than sulfuric acid
Dew-point temperature, be directly entered flue gas heat-exchange unit and will lead to heat exchanger and low-temperature corrosion phenomenon occur；
Step 2: the flue gas of hot-blast stove is guided in the flue after taking off white condenser system by bypass flue, will take off white cold
The flue gas that system comes out is to 100 DEG C or so (more than the dew-point temperature of sulfuric acid), to avoid the occurrence of flue gas heat-exchange unit flue
Corrosion phenomenon；
Step 3: take off the flue gas that white condenser system comes out enters flue gas heat-exchange unit for flue gas temperature after bypass flue heats
Degree is promoted to 250 DEG C or so, is promoted flue-gas temperature to 280 DEG C or so using hot-blast stove and is entered Benitration reactor, then
It again passes by flue gas heat-exchange unit and flue-gas temperature is dropped to 130 DEG C or so, be discharged by denitration air-introduced machine from chimney.
In addition to the implementation, all to use equivalent transformation or equivalent replacement the invention also includes there is an other embodiments
The technical solution that mode is formed should all be fallen within the scope of the hereto appended claims.
Claims (9)
1. a kind of hot-blast stove bypass preheating flue gas heat-exchange unit prevents low-temperature corrosion process system, it is characterised in that: it includes hot wind
Furnace system and flue gas heat-exchange unit, the flue gas heat-exchange unit include the first smoke inlet, the first smoke outlet, the second smoke inlet and second row
Mouth, the first smoke-intake pipe road is connected at first smoke inlet, and first smoke-intake pipe road entrance connects sintering plant cigarette
Gas is disposed with electrostatic precipitator, main exhauster, desulphurization system and Tuo Bai condenser system, institute on first smoke-intake pipe road
It states and is connected with the first smoke discharging pipe between the first smoke outlet and hot blast stove system, the hot blast stove system and the second smoke inlet
Between be connected with the second smoke-intake pipe road, Benitration reactor, second smoke outlet are provided on second smoke-intake pipe road
It is connected with the second smoke discharging pipe, second smoke discharging pipe outer end is connected to chimney, is arranged on second smoke discharging pipe
There is denitration air-introduced machine, bypass flue, the bypass cigarette are connected between second smoke-intake pipe road and the first smoke-intake pipe road
Road one end is connected between hot blast stove system and Benitration reactor, the other end be connected to take off white condenser system and flue gas heat-exchange unit it
Between.
2. a kind of hot-blast stove bypass preheating flue gas heat-exchange unit according to claim 1 prevents low-temperature corrosion process system,
It is characterized in that: being connected with ammonia pipeline, institute on the second smoke-intake pipe road between the hot blast stove system and Benitration reactor
Ammonia pipeline outer end connection ammonia area is stated, is provided with ammonia water evaporator on the ammonia pipeline.
3. a kind of hot-blast stove bypass preheating flue gas heat-exchange unit according to claim 1 prevents low-temperature corrosion process system,
Be characterized in that: the hot blast stove system includes hot-blast stove and burner, is provided with flue mixing chamber above the hot-blast stove, described
Flue mixing chamber includes two imports and one outlet, and one of import is connected with the first smoke discharging pipe, another import
It is connected with hot-blast stove smoke outlet, outlet is connected with the second smoke-intake pipe road, and second smoke-intake pipe is provided with bypass cigarette on road
Road.
4. a kind of hot-blast stove bypass preheating flue gas heat-exchange unit according to claim 3 prevents low-temperature corrosion process system,
It is characterized in that: being separately connected on the burner and be provided with fuel channel and main air duct, the fuel channel entrance connection is high
Producer gas, is disposed with that orifice flowmeter, hand off valve, pressure gauge, gaseous-pressure is high and low opens on the fuel channel
Pass, fuel pressure transmitter, the first pneumatic cut-off valve, the second pneumatic cut-off valve and electric control valve, the described first pneumatic cutting
It is provided with exhausting pipeline between valve and the second pneumatic cut-off valve, manual vent valve and pneumatic emptying are provided on the exhausting pipeline
Valve is provided with combustion air pressure switch and combustion fan on the main air duct；
5. a kind of hot-blast stove bypass preheating flue gas heat-exchange unit according to claim 3 prevents low-temperature corrosion process system,
It is characterized in that: being provided with air distribution outlet on the hot-blast stove, air distribution pipeline, institute are set between first smoke discharging pipe and air distribution outlet
It states and is provided with air distribution blower on air distribution pipeline.
6. a kind of hot-blast stove bypass preheating flue gas heat-exchange unit according to claim 3 prevents low-temperature corrosion process system,
It is characterized in that: being provided with ignition system in the heating furnace, the ignition system includes igniting general pipeline, the igniting manifold entrance
Liquefied petroleum gas is connected, the first igniting hand valve and igniting pneumatic operated valve, the igniting general pipeline are disposed on the igniting general pipeline
Outlet is divided into multiple igniting branch pipes, is disposed with the second igniting hand valve and burning torch on each igniting branch pipe.
7. a kind of flue gas spray according to claim 5 takes off white system, it is characterised in that: the heating furnace body side is set
It is equipped with the first temperature monitoring point, second temperature monitoring point, first smoke exhaust pipe are provided at the heating furnace smoke vent position
It is provided with third temperature monitoring point on road, is provided with the 4th temperature monitoring point on second smoke-intake pipe road.
8. a kind of flue gas spray according to claim 7 takes off white system, it is characterised in that: the air distribution blower passes through route
It is connected with second temperature monitoring point and third temperature monitoring point；The 4th temperature monitoring point by route respectively with combustion air
Machine is connected with electric control valve.
9. a kind of hot-blast stove bypass preheating flue gas heat-exchange unit prevents low-temperature corrosion process, it is characterised in that the method includes
Following steps:
Step 1: the flue gas of sintering plant discharge successively passes through electrostatic precipitator, main exhauster, desulphurization system and Tuo Bai condensed system
System is at this time 45 DEG C from the flue-gas temperature that white condenser system comes out is taken off；
It, will be from taking off white cold system Step 2: the flue gas of hot-blast stove is guided in the flue after taking off white condenser system by bypass flue
System comes out flue gas to 100 DEG C；
Flue-gas temperature is mentioned Step 3: taking off the flue gas that white condenser system comes out and entering flue gas heat-exchange unit after bypass flue heats
250 DEG C are raised to, flue-gas temperature is promoted to 280 DEG C using hot-blast stove and enters Benitration reactor, then again passes by flue gas
Flue-gas temperature is dropped to 130 DEG C by heat exchanger, is discharged using denitration air-introduced machine from chimney.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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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| CN110260348A true CN110260348A (en) | 2019-09-20 |
| CN110260348B CN110260348B (en) | 2024-04-16 |
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