CN106521144A - Method and system for reducing content of CO and nitric oxide in sintering waste gas - Google Patents
Method and system for reducing content of CO and nitric oxide in sintering waste gas Download PDFInfo
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- CN106521144A CN106521144A CN201610982181.1A CN201610982181A CN106521144A CN 106521144 A CN106521144 A CN 106521144A CN 201610982181 A CN201610982181 A CN 201610982181A CN 106521144 A CN106521144 A CN 106521144A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/16—Sintering; Agglomerating
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Abstract
The invention provides a method and system for reducing the content of CO and nitric oxide in sintering waste gas. The method includes the steps that materials for sintering are prepared; the materials are primarily mixed, wherein the primary mixing time ranges from 2 min to 4 min; the materials are secondarily mixed, wherein the secondary mixing time ranges from 2 min to 4 min, and the water distribution amount of the secondarily-mixed materials ranges from 6.0% to 8.0%; the secondarily-mixed materials are laid on a sintering machine, wherein the laying thickness ranges from 400 mm to 1,000 mm; the ignition temperature of the sintering machine is controlled to range from 1,000 DEG C to 1,200 DEG C; and in a preset sintering region, remaining water is sprayed on the sintering material face of the sintering machine in a steam form through a humidifying device. Thus, the remaining water is added into the sintering materials in the manner that steam is sprayed to the sintering material face, the breathability of the sintering material face can be improved, complete combustion of sintering fuel is promoted, and therefore the content of CO in the sintering waste gas is reduced; and meanwhile, the steam is sprayed, so that generation of fuel type and thermal type nitric oxide in the sintering process is restrained, and the content of nitric oxide in the sintering waste gas can be reduced.
Description
Technical field
The invention belongs to material sintering technology field is smelted iron, more particularly to CO and nitrogen oxides contain in a kind of reduction sintered discharge gas
The method and system of amount.
Background technology
The heat mainly produced by fuel combustion into ore deposit of sintering deposit providing, works of the C in fuel in blower fan exhausting
Burnt successively with from top to bottom and transmit heat, so that sintering feed is bonded to ore deposit.
It is in the production process of sintering deposit, as the burning of C has burning and two kinds of forms of imperfect combustion completely and complete
The discharged heat of full burning is as many as unburnt three times；Therefore improve sintering fuel efficiency of combustion be to increase it is sintered
Journey heat, the important means for reducing fuel consumption；Fuel consumption reduces reducing the pollutant in sintered discharge gas again simultaneously.But
Use CO2/ (CO+CO2) is had found to sintered discharge gas composition test, CO in waste gas evaluating during the efficiency of combustion of sintering process fuel
Content up to 3%, and CO2/ (CO+CO2) then 75% or so, during this represents 4 parts in sintering fuel of C, have 3 parts to be to generate
CO2, and have 1 part then to generate CO, illustrate that sintering fuel utilization rate is relatively low.And if CO can be improved2/(CO+CO2), increase
C changes into CO2Ratio, then equal firing rate needed for caloric value will reduce, be more conducive to realize energy-saving and emission-reduction.Meanwhile,
In the combustion process of C, spray plus steam are advantageous for reducing the bed of material highest temperature, with reference to the raising of sintering combustion efficiency, then have
Beneficial to the generation for suppressing sintering process fuel type and thermal NO, so as to be conducive to the reduction of discharging of nitrogen oxides of exhaust gas.
Based on this, the present invention provides a kind of method and system for reducing CO and nitrogen oxides in sintered discharge gas content, to solve
The problems referred to above certainly of the prior art.
The content of the invention
For the problem that prior art is present, CO and nitrogen oxidation in a kind of reduction sintered discharge gas is embodiments provided
The method and system of thing content, to solve in prior art, in the production process of sintering deposit, sintering fuel utilization rate is low, combustion
Burning not exclusively causes the technical problem that the pollutant in sintered discharge gas increases.
The present invention provides a kind of method for reducing CO and amount of nitrogen oxides in sintered discharge gas, and methods described includes：
It is equipped with sintering material used；
Mixed once is carried out to the material；
The material is carried out after secondary mixing, the water distribution quantity of the material is 6.0-8.0%；
The secondary mixed material is laid on sintering machine, laying thickness is 400～1000mm；
The firing temperature for controlling the sintering machine is 1000～1200 DEG C；
In default sintering region, it is sprayed on the sintering machine in vapour form using the remaining water yield of damping device
Sintering charge level on.
In such scheme, the component of the material includes：
Iron Ore Powder, its mass percent are 50～80%；
Return mine, its mass percent is 10～30%；
Quick lime, its mass percent are 0～10%；
Dolomite, its mass percent are 0～10%；
Lime stone, its mass percent are 0～10%；
Fuel, its mass percent are 3～8%.
In such scheme, the firing temperature of the sintering machine is controlled for, after 1000～1200 DEG C, methods described also includes：
It is 7000～20000Pa to control to sinter negative pressure；
Control to light a fire negative pressure for 3000～15000Pa.
In such scheme, the temperature of the steam is not less than 130 DEG C.
The present invention also provides a kind of system for reducing CO and amount of nitrogen oxides in sintered discharge gas, and the system includes：
Unit is equipped with, the outfit unit is used to be equipped with sintering material used；
First mixed cell, first mixed cell is for carrying out mixed once to the material；
Second mixed cell, second mixed cell for secondary mixing is carried out to the material, institute after secondary mixing
The water distribution quantity for stating material is 6.0-8.0%；
Unit is laid, the laying unit is laid thick for the secondary mixed material is laid in sintering machine
Spend for 400～1000mm；
First control unit, the firing temperature for controlling the sintering machine are 1000～1200 DEG C；
The remaining water yield is sprayed at the sintering machine for controlling damping device by the second control unit in vapour form
Sintering charge level on.
In such scheme, the damping device includes：
Main pipeline, the main pipeline are arranged on the side of sintering machine；
Arm, one end of the arm are connected with the main pipeline；
Injection device, the injection device are connected with the other end of each arm, and positioned at the upper of the sintering charge level
Side.
In such scheme, the injection device is 5～30cm with described the distance between the charge level that sinters.
In such scheme, the injection device on adjacent arm is arranged for staggered form.
In such scheme, the temperature of the steam is not less than 130 DEG C.
In such scheme, the distance between every arm is 1～8m.
The invention provides a kind of method and system for reducing CO and amount of nitrogen oxides in sintered discharge gas, methods described bag
Include：It is equipped with sintering material used；Mixed once is carried out to the material；Secondary mixing, secondary mixing are carried out to the material
The water distribution quantity of the material is 6.0-8.0% afterwards；The secondary mixed material is laid on sintering machine, laying thickness is
400～1000mm；The firing temperature for controlling the sintering machine is 1000～1200 DEG C；In default sintering region, utilize and add
On the sintering charge level that wet device is sprayed at the remaining water yield on the sintering machine in vapour form；Thus, by the remaining water yield
Added into sintered material by way of steam being sprayed to sintering charge level, can improve the gas permeability of sintering charge level, promote to burn
The burning completely of knot fuel, and then reduce the content of CO and nitrogen oxides in sintered discharge gas.
Description of the drawings
Fig. 1 is that the method flow for reducing CO and amount of nitrogen oxides in sintered discharge gas that the embodiment of the present invention one is provided is illustrated
Figure；
Fig. 2 is the overall structure diagram of the damping device that the embodiment of the present invention one is provided.
Fig. 3 shows for the system architecture for reducing CO and amount of nitrogen oxides in sintered discharge gas that the embodiment of the present invention three is provided
It is intended to.
Specific embodiment
In the production process of sintering deposit, for the burning completely of acceleration of sintering fuel, and then reduce CO in sintered discharge gas
With the content of nitrogen oxides, the invention provides it is a kind of reduce sintered discharge gas in CO and amount of nitrogen oxides method and system,
Methods described includes：It is equipped with sintering material used；Mixed once is carried out to the material；The material is carried out secondary mixed
Close, after secondary mixing, the water distribution quantity of the material is 6.0-8.0%；The secondary mixed material is laid in into sintering machine
On, laying thickness is 400～1000mm；The firing temperature for controlling the sintering machine is 1000～1200 DEG C；In default sintering
In region, using on the sintering charge level that damping device is sprayed at the remaining water yield on the sintering machine in vapour form.
Technical scheme is described in further detail below by drawings and the specific embodiments.
Embodiment one
The present embodiment provides a kind of method for reducing sintered discharge gas content, as shown in figure 1, methods described includes following step
Suddenly：
Step 110, is equipped with sintering material used.
In this step, before sintering, need to be equipped with the material needed for sintering；Before material is equipped with, will using digester
Lime is configured to calcium hydroxide, powder of the calcium hydroxide for stable components with water.When being equipped with material, by fuel gross mass
40-80% adds into the material in proportioning room.
Wherein, the component of the material includes：Iron Ore Powder, its mass percent are 50～80%；Preferably 60～
70%；Return mine, its mass percent is 10～30%, it is therefore preferable to 15～25%；Quick lime, its mass percent be 0～
10%, it is preferable that for 4～8%；Dolomite, its mass percent are 0～10%, preferably 5～9%；Lime stone, its quality
Percentage is 0～10%, preferably 4～7%；Fuel, its mass percent are 3～8%；Wherein, the fuel is generally Jiao
Powder.
Step 111, carries out mixed once to the material, and the mixed once time is 2～4min.
In this step, when material is with after getting ready, needs carry out mixed once, and the time of mixed once to the material
For 2～4min, it is therefore preferable to 2.5～3.5min.
Step 112, carries out secondary mixing to the material, and secondary incorporation time is 2～4min.
In this step, material is carried out after mixed once, also needs to carry out the material secondary mixing with by material pelletization,
Secondary incorporation time is 2～4min；And the water distribution quantity of the material is the 6.0-8.0% of total water distribution quantity after secondary mixing.Its
In, the 20-60% of the fuel gross mass is added into the material in the last 1min of secondary mixing.
Step 113, the secondary mixed material is laid on sintering machine, and laying thickness is 400～1000mm.
In this step, after material is mixed, the secondary mixed material is uniformly laid on sintering machine, cloth
If thickness is 400～1000mm, it is preferable that for 600～900mm.
Step 114, in default sintering region, the remaining water yield is sprayed on the sintering machine in vapour form
On sintering charge level.
In this step, after the material is uniformly laid on sintering machine, the firing temperature for controlling the sintering machine is
1000～1200 DEG C；Control to light a fire negative pressure for 3000～15000Pa；It is 7000～20000Pa to control to sinter negative pressure.
After firing temperature, igniting negative pressure and sintering negative pressure when sintering machine all sets, in default sintering region,
Using on the sintering charge level that damping device is sprayed at the remaining water yield on the sintering machine in vapour form.Wherein, it is default
Sintering region can include：20～40m at ignition of sintering process position, or 30 at ignition of sintering process position～
70m。
Specifically, referring to Fig. 2, damping device includes：Main pipeline 1, arm 2, injection device 3；Wherein,
The main pipeline 1 is arranged on the side of sintering machine, for providing water source or vapor source to arm 2.Wherein, described
There is a default distance between 4 at pipe 2 and the ignition of sintering process；The distance can not be too small, to prevent newly formed sintering
Height temperate zone is extinguished by water or steam；Can not be excessive, spray effect is not otherwise had, therefore can be by apart from the sintering machine
At arm 2 nearest at igniting and the ignition of sintering process, the distance between 4 are set to 10～15m.Preferably 12m.
One end of each arm 2 is connected with the main pipeline 1 respectively, and the arm 2 includes multiple, is specifically as follows：8～40
Root；And the distance between each arm 2 is 1～8m.
Each injection device 3 is connected with the other end of each arm 2 respectively, and the injection device 3 is located at the burning
The top in ramming material face, for sintering charge level spray water or steam；Wherein, 4～10 sprays are laid with every arm 2 respectively
Emitter part 3；The injection device 3 is specifically as follows shower nozzle or nozzle.Here, in order to ensure spray effect, on adjacent arm 2
Injection device 3 is arranged for staggered form.
Further, in sintering machine running, sintering fabric can shrink, and its height on sintering machine gradually can subtract
Little, in order to ensure spray effect, the injection device 3 remains at 5～30cm with described the distance between the fabric that sinters；It is excellent
Selection of land, is 20cm.Also, during sprinkling, the temperature of the sprinkling steam is not less than 130 DEG C.
In sintering process, the spray water or steam total amount can be 1-6t/h, and sinter before corresponding reduction igniting
Water distribution quantity in compound, to ensure that total Water is certain.
In actual production, after ignition of sintering process 5 minutes or so, the valve controlled on each arm 2 is opened, each injection device
3 start uniformly to be sprayed to sintering fabric, and before the discarded temperature of sintering is raised stop sprinkling.
After the completion of sintering, the temperature of sintering deposit is down to into no more than 200 DEG C using central cooler.Sieve aperture is adopted for 5.0mm
Vibratory sieve the sintering deposit particle after cooling treatment is sieved, screenings is sinter return fine, and oversize is finished product sintering deposit.
And the conventional index of sintering deposit is detected using detecting instrument, sintered discharge gas are detected using flue gas analyzer.Its
In, the conventional index includes：Tumbler index, particle diameter be the yield rate of 5～10mm, particle diameter less than 5mm yield rate, solid combustion
The content of consumption and nitrogen oxide NOx.
The method of the reduction sintered discharge gas that the present embodiment is provided, after ignition of sintering process, using injection device to sintered surface
Material sprinkling steam, due to H2The appearance of O so that the effect of sintering fuel burning more preferably, improves bed permeability, promotes fuel
Burning completely, more generate CO2, generate CO and reduce, and be conducive to suppressing sintering process fuel type and heating power type nitrogen oxidation
The generation of thing, and then the content of CO and nitrogen oxides in sintered discharge gas is reduced, and realize energy-saving.
Embodiment two
Corresponding to embodiment one, the present embodiment also provides a kind of system for reducing sintered discharge gas content, as shown in figure 3, institute
The system of stating includes：It is equipped with unit 31, the first mixed cell 32, the second mixed cell 33, laying unit 34, the first control unit 35
And second control unit 36；Wherein,
The unit 31 that is equipped with is used to be equipped with sintering material used；Specifically, before sintering, the outfit unit 31 is needed
The material being equipped with needed for sintering；Before material is equipped with, lime is configured to water by the outfit unit 31 using digester
Calcium hydroxide, powder of the calcium hydroxide for stable components.When being equipped with material, the outfit unit 31 is by fuel gross mass
40-80% adds into the material in proportioning room.
The component of the material includes：Iron Ore Powder, its mass percent are 50～80%；Preferably 60～70%；Return
Ore deposit, its mass percent are 10～30%, it is therefore preferable to 15～25%；Quick lime, its mass percent are 0～10%, preferably
Ground, is 4～8%；Dolomite, its mass percent are 0～10%, preferably 5～9%；Lime stone, its mass percent are 0
～10%, preferably 4～7%；Fuel, its mass percent are 3～8%；Wherein, the fuel is generally coke powder.
When being equipped with unit 31 by material with after getting ready, first mixed cell 32 is for carrying out once to the material
Mixing, mixed once time are 2～4min；Preferably 2.5～3.5min.
After first mixed cell 32 carries out mixed once to material, second mixed cell 33 is for described
Material carries out secondary mixing and is pelletized, and secondary incorporation time is 2～4min, and after secondary mixing, the water distribution quantity of the material is total
The 6.0-8.0% of water distribution quantity；Wherein, in the last 1min of secondary mixing, second mixed cell 33 is additionally operable to will be described
The 20-60% of fuel gross mass is added into the material.
After material is mixed, the unit 34 of laying is for being laid in sintering machine by the secondary mixed material
On, laying thickness is 400～1000mm；Preferably, it is 600～900mm.
After material has been laid, it is 1000 that the first control unit 35 is used to control the firing temperature of the sintering machine
～1200 DEG C；Control to light a fire negative pressure for 3000～15000Pa；It is 7000～20000Pa to control to sinter negative pressure.
After firing temperature, igniting negative pressure and sintering negative pressure when sintering machine all sets, use in the second control unit 36
Default burning on the sintering charge level that the remaining water yield is sprayed on the sintering machine by control damping device in vapour form
In tie region, wherein, default sintering region can include：20～40m at ignition of sintering process position, or distance burning
30～70m at knot machine ignition location.
Specifically, referring to Fig. 2, damping device includes：Main pipeline 1, arm 2, injection device 3；Wherein,
The main pipeline 1 is arranged on the side of sintering machine, for providing water source or vapor source to arm 2.Wherein, described
There is a default distance between 4 at pipe 2 and the ignition of sintering process；The distance can not be too small, to prevent newly formed sintering
Height temperate zone is extinguished by water or steam；Can not be excessive, spray effect is not otherwise had, therefore can be by apart from the sintering machine
At arm 2 nearest at igniting and the ignition of sintering process, the distance between 4 are set to 10～15m.Preferably 12m.
One end of each arm 2 is connected with the main pipeline 1 respectively, and the arm 2 includes multiple, is specifically as follows：8～40
Root；And the distance between each arm 2 is 1～8m.
Each injection device 3 is connected with the other end of each arm 2 respectively, and the injection device 3 is located at the burning
The top in ramming material face, for sintering charge level sprinkling steam；Wherein, 4～10 injectors are laid with every arm 2 respectively
Part 3；The injection device 3 is specifically as follows shower nozzle or nozzle.Here, in order to ensure spray effect, the injection on adjacent arm 2
Device 3 is arranged for staggered form.
Further, in sintering machine running, sintering fabric can shrink, and its height on sintering machine gradually can subtract
Little, in order to ensure spray effect, the injection device 3 remains at 5～30cm with described the distance between the fabric that sinters；It is excellent
Selection of land, is 20cm.Also, during sprinkling, the temperature of the sprinkling steam is not less than 130 DEG C.
In sintering process, the spray water or steam total amount can be 1-6t/h, and sinter before corresponding reduction igniting
Water distribution quantity in compound, to ensure that total Water is certain.
In actual production, after ignition of sintering process 5 minutes or so, the second control unit control is default to be sintered in region
Each arm 2 on valve open, each injection device 3 starts uniformly to be sprayed to sintering fabric, and in the discarded temperature of sintering
Stop sprinkling before raising.
After the completion of sintering, the temperature of sintering deposit is down to into no more than 200 DEG C using central cooler.Sieve aperture is adopted for 5.0mm
Vibratory sieve the sintering deposit particle after cooling treatment is sieved, screenings is sinter return fine, and oversize is finished product sintering deposit.
And the conventional index of sintering deposit is detected using detecting instrument, sintered discharge gas are detected using flue gas analyzer.Its
In, the conventional index includes：Tumbler index, particle diameter be the yield rate of 5～10mm, particle diameter less than 5mm yield rate, solid combustion
The content of consumption and nitrogen oxide NOx.
In practical application, the outfit unit 31, the first mixed cell 32, the second mixed cell 33, lay unit 34, the
One control unit 35 and the second control unit 36 can be by (CPU, the Central Processing of the central processing unit in the device
Unit), digital signal processor (DSP, Digtal Signal Processor), programmable logic array (FPGA, Field
Programmable Gate Array), micro-control unit (MCU, Micro Controller Unit) realize.
The system of the reduction sintered discharge gas content that the present embodiment is provided, after ignition of sintering process, control injection device is to pre-
If the sintering fabric sprinkling steam in region, due to H2The appearance of O so that the effect of sintering fuel burning more preferably, improves the bed of material
Gas permeability, promotes the burning completely of fuel, more generates CO2, generate CO and reduce, and be conducive to suppressing sintering process fuel
The generation of type and thermal NO, and then the content of CO and nitrogen oxides in sintered discharge gas is reduced, and realize energy-saving.
Embodiment three
In practical application, when the reduction that the method and embodiment two of the reduction waste gas content provided using embodiment one are provided
It is during the system production sintering deposit of waste gas content, specific as follows：
Before sintering, need to be equipped with the material needed for sintering；Before material is equipped with, lime is matched somebody with somebody with water using digester
Make calcium hydroxide, powder of the calcium hydroxide for stable components.When being equipped with material, the fuel that mass percent is 2% is existed
Proportioning room is added into the material.
Wherein, the component of the material includes：Iron Ore Powder, its mass percent are 64%；Return mine, its mass percent is
24%；Quick lime, its mass percent are 4%；Lime stone, its mass percent are 5%；Fuel, its mass percent is
3%；Wherein, the fuel is generally coke powder.
When material is with after getting ready, needs carry out mixed once to the material, and the time of mixed once is 2min.
Material is carried out after mixed once, also need to carry out the material secondary mixing, secondary incorporation time is 3min；And
And the water distribution quantity of the material is the 6.5-7.0% of total water distribution quantity after secondary mixing.Wherein, by combustion that mass percent is 1%
Material is added into the material in the last 1min of secondary mixing.
After material is mixed, the secondary mixed material is uniformly laid on sintering machine, laying thickness is
800mm。
After the material is uniformly laid on sintering machine, the firing temperature for controlling the sintering machine is 1050 DEG C；Igniting
Time is 3min, controls to light a fire negative pressure for 9000Pa；When the coke powder in material starts burning, controlling sintering negative pressure is
150000Pa。
In sintering process, in the sintering region of 20～40m at ignition of sintering process position, will using damping device
The remaining water yield is sprayed on the sintering charge level on the sintering machine in vapour form.Specifically, referring to Fig. 2, damping device bag
Include：Main pipeline 1, arm 2, injection device 3；Wherein,
The main pipeline 1 is arranged on the side of sintering machine, for providing water source or vapor source to arm 2.Wherein, described
There is a default distance between 4 at pipe 2 and the ignition of sintering process；The distance can not be too small, to prevent newly formed sintering
Height temperate zone is extinguished by water or steam；Can not be excessive, spray effect is not otherwise had, therefore can be by apart from the sintering machine
At arm 2 nearest at igniting and the ignition of sintering process, the distance between 4 are set to 10～15m.Preferably 10m.
One end of each arm 2 is connected with the main pipeline 1 respectively, and the arm 2 includes multiple, is specifically as follows：8～40
Root, the present embodiment open 6；And the distance between each arm 2 is 4m.
Each injection device 3 is connected with the other end of each arm 2 respectively, and the injection device 3 is located at the burning
The top in ramming material face, for sintering charge level spray water or steam；Wherein, 4～10 sprays are laid with every arm 2 respectively
Emitter part 3；The injection device 3 is specifically as follows shower nozzle or nozzle.Here, in order to ensure spray effect, on adjacent arm 2
Injection device 3 is arranged for staggered form.
Further, in sintering machine running, sintering fabric can shrink, and its height on sintering machine gradually can subtract
Little, in order to ensure spray effect, the injection device 3 remains at 5～30cm with described the distance between the fabric that sinters；It is excellent
Selection of land, is 20cm.Also, during sprinkling, the temperature of the sprinkling steam is not less than 130 DEG C.
In sintering process, the spray water or steam total amount can be 2t/h, and sintering is mixed before corresponding reduction igniting
The water distribution quantity in material is closed, to ensure that total Water is certain.
In actual production, after ignition of sintering process 5 minutes or so, the valve controlled on corresponding arm 2 is opened, each injector
Part 3 starts uniformly to be sprayed to sintering fabric, and before the discarded temperature of sintering is raised stops sprinkling.
After the completion of sintering, the temperature of sintering deposit is down to into no more than 200 DEG C using central cooler.Sieve aperture is adopted for 5.0mm
Vibratory sieve the sintering deposit particle after cooling treatment is sieved, screenings is sinter return fine, and oversize is finished product sintering deposit.
And the conventional index of sintering deposit is detected using detecting instrument, sintered discharge gas are detected using flue gas analyzer.Its
In, conventional index is generally：Tumbler index, solid burnup, the rate of return mine, ore particle diameter (include 5-10mm and<5mm)；Sintering is useless
Gas mainly includes nitrogen oxide NOx；And contrasted with sintering process in prior art, its comparing result is as shown in table 1：
Table 1
As can be seen from Table 1, in the present embodiment, in sintered discharge gas, the content of nitrogen oxides is substantially reduced.
The method for reducing CO and amount of nitrogen oxides in sintered discharge gas that the present embodiment is provided using embodiment one, in sintering
After machine igniting, the sintering fabric sprinkling in the sintering region of the 20～40m adjusted the distance using injection device at ignition of sintering process position
Steam, due to H2The appearance of O so that the effect of sintering fuel burning more preferably, improves bed permeability, promotes the complete of fuel
Burning, more generates CO2, generate CO and reduce, and then reduce the content of CO and nitrogen oxides in sintered discharge gas, and realize energy-conservation
Consumption reduction.
Example IV
Corresponding to embodiment three, when the method and embodiment that reduce waste gas content that the present embodiment is provided using embodiment one
It is during the system production sintering deposit of the two reduction waste gas contents for providing, specific as follows：
Before sintering, need to be equipped with the material needed for sintering；Before material is equipped with, lime is matched somebody with somebody with water using digester
Make calcium hydroxide, powder of the calcium hydroxide for stable components.When being equipped with material, the fuel that mass percent is 2% is existed
Proportioning room is added into the material.
Wherein, the component of the material includes：Iron Ore Powder, its mass percent are 64%；Return mine, its mass percent is
24%；Quick lime, its mass percent are 4%；Dolomite, its mass percent are 2%；Lime stone, its mass percent is
3%；Fuel, its mass percent are 3%；Wherein, the fuel is generally coke powder.
When material is with after getting ready, needs carry out mixed once to the material, and the time of mixed once is 3min.
Material is carried out after mixed once, also need to carry out the material secondary mixing and pelletize, secondary incorporation time
For 4min；And the water distribution quantity of the material is the 6.8-7.8% of total water distribution quantity after secondary mixing.Wherein, by mass percent
Fuel for 1% is added into the material in the last 1min of secondary mixing.
After material is mixed, the secondary mixed material is uniformly laid on sintering machine, laying thickness is
900mm。
After the material is uniformly laid on sintering machine, the firing temperature for controlling the sintering machine is 1150 DEG C；Igniting
Time is 4min, controls to light a fire negative pressure for 10000Pa；When the coke powder in material starts burning, controlling sintering negative pressure is
160000Pa。
In sintering process, in the sintering region of 30～70m at ignition of sintering process position, will using damping device
The remaining water yield is sprayed on the sintering charge level on the sintering machine in vapour form.Specifically, referring to Fig. 2, damping device bag
Include：Main pipeline 1, arm 2, injection device 3；Wherein,
The main pipeline 1 is arranged on the side of sintering machine, for providing water source or vapor source to arm 2.Wherein, described
There is a default distance between 4 at pipe 2 and the ignition of sintering process；The distance can not be too small, to prevent newly formed sintering
Height temperate zone is extinguished by water or steam；Can not be excessive, spray effect is not otherwise had, therefore can be by apart from the sintering machine
At arm 2 nearest at igniting and the ignition of sintering process, the distance between 4 are set to 10～15m.Preferably 10m.
One end of each arm 2 is connected with the main pipeline 1 respectively, and the arm 2 includes multiple, is specifically as follows：8～40
Root, the present embodiment open 9；And the distance between each arm 2 is 4.5m.
Each injection device 3 is connected with the other end of each arm 2 respectively, and the injection device 3 is located at the burning
The top in ramming material face, for sintering charge level spray water or steam；Wherein, 4～10 sprays are laid with every arm 2 respectively
Emitter part 3；The injection device 3 is specifically as follows shower nozzle or nozzle.Here, in order to ensure spray effect, on adjacent arm 2
Injection device 3 is arranged for staggered form.
Further, in sintering machine running, sintering fabric can shrink, and its height on sintering machine gradually can subtract
Little, in order to ensure spray effect, the injection device 3 remains at 5～30cm with described the distance between the fabric that sinters；It is excellent
Selection of land, is 15cm.Also, during sprinkling, the temperature of the sprinkling steam is 150 DEG C.
In sintering process, the spray water or steam total amount can be 2t/h, and sintering is mixed before corresponding reduction igniting
The water distribution quantity in material is closed, to ensure that total Water is certain.
In actual production, after ignition of sintering process 5 minutes or so, the valve controlled on corresponding arm 2 is opened, each injector
Part 3 starts uniformly to be sprayed to sintering fabric, and before the discarded temperature of sintering is raised stops sprinkling.
After the completion of sintering, the temperature of sintering deposit is down to into no more than 200 DEG C using central cooler.Sieve aperture is adopted for 5.0mm
Vibratory sieve the sintering deposit particle after cooling treatment is sieved, screenings is sinter return fine, and oversize is finished product sintering deposit.
And the conventional index of sintering deposit is detected using detecting instrument, sintered discharge gas are detected using flue gas analyzer.Its
In, conventional index is generally：Tumbler index, solid burnup, the rate of return mine, ore particle diameter (include 5-10mm and<5mm)；Sintering is useless
Gas mainly includes nitrogen oxide NOx；And contrasted with sintering process in prior art, its comparing result is as shown in table 2：
Table 2
As can be seen from Table 2, in the present embodiment, in sintered discharge gas, the content of nitrogen oxides is substantially reduced.
The method for reducing CO and amount of nitrogen oxides in sintered discharge gas that the present embodiment is provided using embodiment one, in sintering
After machine igniting, the sintering fabric sprinkling in the sintering region of the 30～70m adjusted the distance using injection device at ignition of sintering process position
Steam, due to H2The appearance of O so that the effect of sintering fuel burning more preferably, improves bed permeability, promotes the complete of fuel
Burning, more generates CO2, generate CO and reduce, and be conducive to suppressing the life of sintering process fuel type and thermal NO
Into, and then the content of CO and nitrogen oxides in sintered discharge gas is reduced, and realize energy-saving.
The above, only presently preferred embodiments of the present invention is not intended to limit protection scope of the present invention, it is all
Any modification, equivalent and improvement for being made within the spirit and principles in the present invention etc., should be included in the protection of the present invention
Within the scope of.
Claims (10)
1. it is a kind of reduce sintered discharge gas in CO and amount of nitrogen oxides method, it is characterised in that methods described includes：
It is equipped with sintering material used；
Mixed once is carried out to the material；
The material is carried out after secondary mixing, the water distribution quantity of the material is 6.0-8.0%；
The secondary mixed material is laid on sintering machine, laying thickness is 400～1000mm；
The firing temperature for controlling the sintering machine is 1000～1200 DEG C；
In default sintering region, the burning on the sintering machine is sprayed in vapour form using the remaining water yield of damping device
On ramming material face.
2. the method for claim 1, it is characterised in that the component of the material includes：
Iron Ore Powder, its mass percent are 50～80%；
Return mine, its mass percent is 10～30%；
Quick lime, its mass percent are 0～10%；
Dolomite, its mass percent are 0～10%；
Lime stone, its mass percent are 0～10%；
Fuel, its mass percent are 3～8%.
3. the method for claim 1, it is characterised in that the firing temperature for controlling the sintering machine is 1000～1200 DEG C
Afterwards, methods described also includes：
It is 7000～20000Pa to control to sinter negative pressure；
Control to light a fire negative pressure for 3000～15000Pa.
4. the method for claim 1, it is characterised in that the temperature of the steam is not less than 130 DEG C.
5. it is a kind of reduce sintered discharge gas in CO and amount of nitrogen oxides system, it is characterised in that the system includes：
Unit is equipped with, the outfit unit is used to be equipped with sintering material used；
First mixed cell, first mixed cell is for carrying out mixed once to the material；
Second mixed cell, second mixed cell for secondary mixing is carried out to the material, the thing after secondary mixing
The water distribution quantity of material is 6.0-8.0%；
Unit is laid, for the secondary mixed material is laid in sintering machine, lay thickness is the laying unit
400～1000mm；
First control unit, the firing temperature for controlling the sintering machine are 1000～1200 DEG C；
The remaining water yield is sprayed at the burning on the sintering machine for controlling damping device by the second control unit in vapour form
On ramming material face.
6. system as claimed in claim 5, it is characterised in that the damping device includes：
Main pipeline, the main pipeline are arranged on the side of sintering machine；
Arm, one end of the arm are connected with the main pipeline；
Injection device, the injection device are connected with the other end of each arm, and positioned at the top of the sintering charge level.
7. system as claimed in claim 6, it is characterised in that the distance between the injection device and described sintering charge level are
5～30cm.
8. system as claimed in claim 6, it is characterised in that the injection device on adjacent arm is staggered form arrangement.
9. system as claimed in claim 6, it is characterised in that the temperature of the steam is not less than 130 DEG C.
10. system as claimed in claim 6, it is characterised in that the distance between described each arm is 1～8m.
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| CN110484716A (en) * | 2019-09-18 | 2019-11-22 | 四川省达州钢铁集团有限责任公司 | A kind of method and device enhancing heat exchange between air and sinter bed |
| CN111455167A (en) * | 2020-05-23 | 2020-07-28 | 山东泰山钢铁集团有限公司 | Sintering method for promoting combustion by water spraying for sintering machine |
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| CN112797796A (en) * | 2021-01-06 | 2021-05-14 | 中冶长天国际工程有限责任公司 | Device for spraying water vapor on sintering material surface and control method thereof |
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Address after: 100041 Shijingshan Road, Beijing, No. 68, No. Applicant after: Shougang Group Co. Ltd. Address before: 100041 Shijingshan Road, Beijing, No. 68, No. Applicant before: Capital Iron & Steel General Company |
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Application publication date: 20170322 |