CN110487065A - Grate preheats two sections of warm-air supply systems and temperature control method - Google Patents
Grate preheats two sections of warm-air supply systems and temperature control method Download PDFInfo
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- CN110487065A CN110487065A CN201910916240.9A CN201910916240A CN110487065A CN 110487065 A CN110487065 A CN 110487065A CN 201910916240 A CN201910916240 A CN 201910916240A CN 110487065 A CN110487065 A CN 110487065A
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- sections
- grate
- hot
- rotary kiln
- temperature
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- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000002485 combustion reaction Methods 0.000 claims abstract description 47
- 239000007789 gas Substances 0.000 claims abstract description 33
- 239000000446 fuel Substances 0.000 claims abstract description 14
- 238000010438 heat treatment Methods 0.000 claims abstract description 13
- 230000000694 effects Effects 0.000 claims abstract description 10
- 239000002737 fuel gas Substances 0.000 claims abstract description 8
- 238000003795 desorption Methods 0.000 claims abstract description 5
- 238000005192 partition Methods 0.000 claims abstract description 4
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 11
- 238000005453 pelletization Methods 0.000 description 17
- 238000001035 drying Methods 0.000 description 10
- 238000004519 manufacturing process Methods 0.000 description 8
- 238000001816 cooling Methods 0.000 description 4
- 239000008188 pellet Substances 0.000 description 4
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 3
- 238000005422 blasting Methods 0.000 description 3
- 239000003546 flue gas Substances 0.000 description 3
- 239000003517 fume Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000007605 air drying Methods 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- 239000000567 combustion gas Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000007363 ring formation reaction Methods 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/14—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects using gases or vapours other than air or steam, e.g. inert gases
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/001—Extraction of waste gases, collection of fumes and hoods used therefor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/004—Systems for reclaiming waste heat
Abstract
The present invention relates to a kind of grates to preheat two sections of warm-air supply systems and temperature control method, grate including being connected to rotary kiln hood preheats two sections of upper covers, it is characterized by also including hot-blast pipe lines and heat patching device that grate preheating two sections of upper cover tops and two sides are arranged in, setting desorption tube and valve at the top of rotary kiln hood preheat two sections of upper cover ends and rotary kiln hood junction in grate and partition wall are arranged；Heat patching device is made of combustion chamber, fuel burner nozzle, fuel gas supply pipeline, combustion air feeding pipe and gas control valve and air shut-off valve, and the multiple combustion chambers for being symmetrical arranged on the outside of two sections of upper covers two and being connected to two sections of upper covers of preheating are preheated in grate.Its temperature control method is: warm-air supply, and concurrent heating and grate preheat temperature field control in two sections of upper covers.Advantage be into grate preheat two sections of bed of materials air flow method it is uniform, pre-heat effect is good；Gas flow temperature gradient is adjustable, and hot blast temperature is made to reach desired value.
Description
Technical field
The invention belongs to ferrous metallurgical industry pellet production technical fields, and in particular to a kind of two sections of heat of grate preheating
Wind feed system and temperature control method.
Background technique
Currently, grate-rotary kiln-ring cold machine technique is one of the main production of iron ore pellets production, commonly
Hot wind process is that grate is divided into four sections of three rooms (three groups), and will be in grate across the mode of the bed of material according to hot stream temperature
Cover is divided into blasting drying period upper cover, down-draft drying zone upper cover, preheated one-section upper cover, totally four sections of two sections of upper covers of preheating；According to hot gas
It flows away to the corresponding blasting drying period of three groups: first group bellows will be divided into four sections of grate upper cover corresponding grate bellows, connects
By the cooling exhaust gas from three cold sections of upper covers of ring cold machine, the medium as forced air drying；Second group of bellows corresponds to down-draft drying zone
And preheated one-section is discharged into atmosphere after all being handled by discharging system after the flue gas of down-draft drying zone and preheated one-section collects；Third
Corresponding two sections of the preheating of group bellows after the hot fume of two sections of preheating is collected, returns on down-draft drying zone after being handled by backheat wind system
Cover, as the medium that exhausting is dry.
Blasting drying period is the first procedure handled in grate pelletizing, and the heat source for forced air drying is
Cooling exhaust gas from three cold sections of upper covers of ring cold machine, thermal current from bottom to top are expected by pelletizing (wet bulb, hereinafter referred to as " green-ball ")
Layer, it is preliminary to remove green-ball moisture.
Down-draft drying zone is the second operation work handled in grate pelletizing, and the heat source dry for exhausting is
Hot fume (hereinafter referred to as " backheat wind ") from grate backheat blower, top-down thermal current are expected by pelletizing (green-ball)
Layer continues to remove green-ball moisture, and the gas flow temperature as exhausting drying source is determined according to Pelletizing Study.
Preheated one-section is the transitional link in grate, and preheated one-section heat source is that the heat from ring cold machine secondary cooling zone upper cover is useless
Green-ball residual moisture is totally removed by the pelletizing bed of material for gas (hereinafter referred to as " secondary cooling zone exhaust gas "), top-down thermal current,
And it is set to heat up as needed pelletizing (dry bulb) heating.
Two sections of preheating is last procedure handled in grate pelletizing, preheats two sections of upper cover ends and kiln
Hood is directly connected to, and the hot fume from rotary kiln enters two sections of upper covers of preheating through kiln hood, then is passed through pelletizing from top to bottom and (done
Ball) bed of material, dry bulb is preheated into the regular hour under preference temperature, so that dry bulb intensity is met the requirement into kiln, across the bed of material
Flue gas is sent to down-draft drying zone upper cover as heat source by backheat blower as " backheat wind ".
Under the influence of the various factors such as material condition, production operation, the flue-gas temperature from rotary kiln may be relatively low, with
The temperature for preheating two sections of needs has a certain distance.In actual production process, if two sections of the preheating air-flow temperature across the bed of material
It spends relatively low, will affect the pelletizing pre-heat effect in grate, gently then influence yield, can make pre- hot-bulb index relatively low when serious, make
At consequences such as Dust Capacity increasing, ring formation of rotary kiln, production stabilization and pellet quality are influenced.
In order to meet the needs of preheating two sections of pelletizings heat exchange, guarantees pelletizing pre-heat effect, generally pass through assisted combustion device
Additional heat, it is common practice to assisted combustion device setting on preheating two sections of upper cover side walls or in kiln hood, both
Mode can play the role of concurrent heating, but all there is drawback:
1) assisted combustion device is arranged on preheating two sections of upper cover side walls, high temperature gas flow from assisted combustion device with come from
The thermal current of rotary kiln has little time to mix, and is segregated the gas flow temperature into the bed of material, the Temperature Distribution in grate width direction
Unevenly, pre-heat effect is influenced, local air flow high temperature can also reduce service life of equipment, and even resulting in equipment deformation influences life
It produces；
2) assisted combustion device is arranged in kiln hood, air-flow can be made to be heated before entering two sections of upper covers of preheating, with side
Assisted combustion device on wall is compared, and air-flow mixed phase is to gas flow temperature trend one that is abundant, but entering two sections of upper covers of preheating
It causes, keeps production chains poor, the gas flow temperature gradient in two sections of upper covers of preheating can not be established.
Therefore, optimization preheats two sections of warm-air supply mode, and it is very necessary for improving the heat transfer effect of two sections of preheating.
Summary of the invention
The object of the present invention is to provide a kind of grates to preheat two sections of warm-air supply systems and temperature control method, makes to enter
The air-flow of grate two sections of bed of materials of preheating uniformity of temperature profile in grate width direction, preheats grate in two sections of upper covers
Gas flow temperature gradient it is adjustable, can according to need control pelletizing in two sections of temperature-rise period of preheating, guarantee the quality of pre- hot-bulb.
The purpose of the present invention is what is be achieved through the following technical solutions:
A kind of grate of the invention preheats two sections of warm-air supply systems, including the grate preheating being connected to rotary kiln hood
Two sections of upper covers, it is characterised in that: further include that grate is arranged in preheat the hot-blast pipe line on two sections of upper cover top and be arranged in chain grate
Machine preheats the heat patching device of two sections of upper cover two sides, and desorption tube is arranged at the top of the rotary kiln hood, sets in bleeder top
Valve preheats two sections of upper cover ends and the rotary kiln hood junction in the grate and partition wall is arranged；
The heat patching device is being fired by combustion chamber, fuel burner nozzle, fuel gas supply pipeline, combustion air feeding pipe and setting
Gas feeding pipe and gas control valve and air shut-off valve composition on combustion air feeding pipe, preheat in the grate
The multiple combustion chambers being connected to two sections of upper covers of preheating are symmetrical arranged on the outside of two sections of upper covers two, the outlet side of the fuel burner nozzle is inserted
Enter combustion chamber end, the inlet end of fuel burner nozzle is connected with fuel gas supply pipeline and combustion air feeding pipe respectively, described
Gas control valve and air shut-off valve be regulating valve；
The hot-blast pipe line is made of time hot-blast main being connected to rotary kiln hood and multiple times hot blast manifolds, multiple
Hot blast manifold one end is gone back to be connected to time hot-blast main, the other end respectively with multiple combustion chambers.
A kind of grate of the invention preheats two sections of hot blast temperature adjusting methods, which is characterized in that includes the following steps:
S1 warm-air supply
The release tube valve being first shut off at the top of rotary kiln hood, the hot wind from rotary kiln is through rotary kiln hood, backheat
Wind general pipeline and time hot blast manifold enter combustion chamber, enter grate by combustion chamber and preheat in two sections of upper covers；
S2 concurrent heating
The effect of heat patching device is to improve the hot blast temperature from rotary kiln, and the hot blast temperature from rotary kiln is lower than set temperature
When, the gas control valve and air shut-off valve of heat patching device are opened, the fuel burner nozzle work of heat patching device is supplied into combustion chamber
Heat, hot wind heats up after being heated in the combustion chamber, after reaching set temperature, preheats in two sections of upper covers into grate；
S3 grate preheats temperature field control in two sections of upper covers
The heat capacity of heat patching device is adjustable, preheats two sections of requirements to hot blast temperature, setting grate preheating according to grate
Two sections of upper cover different parts burn indoor target temperature values, are opened by gas control valve to heat patching device and air shut-off valve
The adjusting of degree adjusts the heating load of heat patching device, makes to enter two sections of indoor gases of upper cover different parts burning of grate preheating
It is heated to the temperature of setting, grate is entered back into and preheats in two sections of upper covers, realizes and two sections of upper case temperatures is preheated to grate
The adjusting of field.
Compared with prior art, advantages of the present invention:
1) present invention is intended to the combustion chamber by heat patching device, In from the hot wind that rotary kiln enters in grate two sections of upper covers of preheating
In the case where needing concurrent heating, air-flow is entered back into after being heated in the combustion chamber in two sections of upper covers of preheating, avoids enter into the gas of the bed of material
Stream temperature segregation, makes the gas flow temperature in grate width direction be evenly distributed, and obtains uniformly in advance for pelletizing at two sections of preheating
Thermal effect creates favorable conditions；
2) the present invention provides the adjusting method in temperature field in two sections of upper covers of preheating, each heat patching device is respectively provided with adjustable combustion
Gas burner can adjust the concurrent heating amount of different parts as needed along grate length direction, make to enter two sections of upper covers of preheating
Hot blast temperature reaches desired value, and the temperature field on grate length direction is made to meet production needs.
Detailed description of the invention
Fig. 1 is schematic diagram of the invention.
Fig. 2 is the A-A diagrammatic cross-section of Fig. 1.
Fig. 3 be 2(of the embodiment of the present invention return hot-blast mains 7 be two) A-A diagrammatic cross-section.
Specific embodiment
Present invention will be further explained below with reference to the attached drawings and examples.
Embodiment 1 and embodiment 2 are different only in that back that hot-blast main 7 is set as the difference of one or two, below into
Row illustrates to introduce together.
As depicted in figs. 1 and 2, a kind of grate of the invention preheats two sections of warm-air supply systems, including with rotary kiln
The grate that hood 1 is connected to preheats two sections of upper covers 5, it is characterised in that: further includes setting on two sections of 5 tops of upper cover of grate preheating
Hot-blast pipe line and the heat patching device that grate preheats two sections of 5 two sides of upper cover is set, set at the top of the rotary kiln hood 1
Separate tube 13 is put, valve 14 is set at the top of desorption tube 13, preheats two sections of 5 ends of upper cover and the revolution in the grate
Partition wall 2 is arranged in 1 junction of kiln kiln hood；
The heat patching device is by combustion chamber 3, fuel burner nozzle 4, fuel gas supply pipeline 9, combustion air feeding pipe 11 and sets
The gas control valve 8 and air shut-off valve 10 set on fuel gas supply pipeline 9 and combustion air feeding pipe 11 form, in chain grate
Machine preheats two sections of upper covers, 5 liang of outsides and is symmetrically arranged with the multiple combustion chambers 3 being connected to two sections of upper covers 5 of preheating, the fuel burner nozzle 4
Outlet side be inserted into 3 end of combustion chamber, the inlet end of fuel burner nozzle 4 respectively with fuel gas supply pipeline 9 and combustion air supply pipe
Road 11 is connected, and the gas control valve 8 and air shut-off valve 10 are regulating valve；
The hot-blast pipe line by with rotary kiln hood 1 be connected to return 6 groups of hot-blast main 7 and multiple times hot blast manifolds
At multiple times 6 one end of hot blast manifold are connected to hot-blast main 7 is returned, and the other end is connected to multiple combustion chambers 3 respectively.
A kind of grate of the invention preheats two sections of hot blast temperature adjusting methods, which is characterized in that includes the following steps:
S1 warm-air supply
The valve 14 being first shut off on the desorption tube 13 at 1 top of rotary kiln hood, the hot wind from rotary kiln 2 is through rotary kiln
Hood 1 returns hot-blast main 7 and returns hot blast manifold 6 into combustion chamber 3, enters grate by combustion chamber 3 and preheats two sections of upper covers 5
It is interior；
S2 concurrent heating
The effect of heat patching device is to improve the hot blast temperature from rotary kiln, and the hot blast temperature from rotary kiln is lower than set temperature
When, the gas control valve 8 and air shut-off valve 11 of heat patching device are opened, the fuel burner nozzle 4 of heat patching device works, to combustion chamber 3
Interior heat supply, hot wind heats up after being heated in combustion chamber 3, after reaching set temperature, preheats in two sections of upper covers 5 into grate；
S3 grate preheats temperature field control in two sections of upper covers
The heat capacity of heat patching device is adjustable, preheats two sections of requirements to hot blast temperature, setting grate preheating according to grate
Target temperature value in two sections of 5 different parts combustion chambers 3 of upper cover is controlled by gas control valve 8 to heat patching device and air
The adjusting of 11 aperture of valve, adjusts the heating load of heat patching device, makes to enter the combustion chamber that grate preheats two sections of 5 different parts of upper cover
Gas in 3 is heated to set temperature, enters back into grate and preheats in two sections of upper covers 5, realizes and preheat on two sections to grate
The adjusting in temperature field in cover 5.
The present invention makes the air-flow for entering grate two sections of bed of materials of preheating uniformity of temperature profile in grate width direction, is
Pelletizing obtains uniform pre-heat effect at two sections of preheating and creates favorable conditions；Different pellet feed conditions are to pelletizing warm
In heating require also different, by adjusting the heating load of combustion chamber end fuel burner nozzle, preheat grate in two sections of upper covers
Gas flow temperature gradient it is adjustable, can according to need control pelletizing in two sections of temperature-rise period of preheating.
Claims (3)
1. a kind of grate preheats two sections of warm-air supply systems, the grate including being connected to rotary kiln hood is preheated on two sections
Cover, it is characterised in that: further include that grate is arranged in preheat the hot-blast pipe line on two sections of upper cover top and be arranged in grate preheating
The heat patching device of two sections of upper cover two sides, the rotary kiln hood top are arranged desorption tube, set valve, In in bleeder top
The grate preheats two sections of upper cover ends and the rotary kiln hood junction and partition wall is arranged；
The heat patching device is being fired by combustion chamber, fuel burner nozzle, fuel gas supply pipeline, combustion air feeding pipe and setting
Gas feeding pipe and gas control valve and air shut-off valve composition on combustion air feeding pipe, preheat in the grate
The multiple combustion chambers being connected to two sections of upper covers of preheating are symmetrical arranged on the outside of two sections of upper covers two, the outlet side of the fuel burner nozzle is inserted
Enter combustion chamber end, the inlet end of fuel burner nozzle is connected with fuel gas supply pipeline and combustion air feeding pipe respectively, described
Gas control valve and air shut-off valve be regulating valve；
The hot-blast pipe line is made of time hot-blast main being connected to rotary kiln hood and multiple times hot blast manifolds, multiple
Hot blast manifold one end is gone back to be connected to time hot-blast main, the other end respectively with multiple combustion chambers.
2. a kind of grate according to claim 1 preheats two sections of warm-air supply systems, it is characterised in that: the backheat
Wind general pipeline is one and returns hot-blast main or twice hot-blast mains.
3. a kind of grate preheats two sections of hot blast temperature adjusting methods, which is characterized in that include the following steps:
S1 warm-air supply
The release tube valve being first shut off at the top of rotary kiln hood, the hot wind from rotary kiln is through rotary kiln hood, backheat
Wind general pipeline and time hot blast manifold enter combustion chamber, enter grate by combustion chamber and preheat in two sections of upper covers；
S2 concurrent heating
The effect of heat patching device is to improve the hot blast temperature from rotary kiln, and the hot blast temperature from rotary kiln is lower than set temperature
When, the gas control valve and air shut-off valve of heat patching device are opened, the fuel burner nozzle work of heat patching device is supplied into combustion chamber
Heat, hot wind heats up after being heated in the combustion chamber, after reaching set temperature, preheats in two sections of upper covers into grate；
S3 grate preheats temperature field control in two sections of upper covers
The heat capacity of heat patching device is adjustable, preheats two sections of requirements to hot blast temperature, setting grate preheating according to grate
Two sections of upper cover different parts burn indoor target temperature values, are opened by gas control valve to heat patching device and air shut-off valve
The adjusting of degree adjusts the heating load of heat patching device, makes to enter two sections of indoor gases of upper cover different parts burning of grate preheating
It is heated to the temperature of setting, grate is entered back into and preheats in two sections of upper covers, realizes and two sections of upper case temperatures is preheated to grate
The adjusting of field.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910916240.9A CN110487065A (en) | 2019-09-26 | 2019-09-26 | Grate preheats two sections of warm-air supply systems and temperature control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910916240.9A CN110487065A (en) | 2019-09-26 | 2019-09-26 | Grate preheats two sections of warm-air supply systems and temperature control method |
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| Publication Number | Publication Date |
|---|---|
| CN110487065A true CN110487065A (en) | 2019-11-22 |
Family
ID=68544370
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910916240.9A Pending CN110487065A (en) | 2019-09-26 | 2019-09-26 | Grate preheats two sections of warm-air supply systems and temperature control method |
Country Status (1)
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Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03281736A (en) * | 1990-03-28 | 1991-12-12 | Kobe Steel Ltd | Combustion method in grate kiln for producing iron-ore pellet |
| CN101932738A (en) * | 2008-03-27 | 2010-12-29 | 株式会社神户制钢所 | The manufacture method of iron ore pellet |
| CN102121786A (en) * | 2011-03-08 | 2011-07-13 | 中冶北方工程技术有限公司 | Hot air system of grate-rotary kiln-circular cooler |
| CN102586592A (en) * | 2012-03-28 | 2012-07-18 | 柳州钢铁股份有限公司 | Method and system for optimizing drying grate-rotary kiln oxidate pellet thermal regulation |
| CN102853680A (en) * | 2012-08-14 | 2013-01-02 | 沈阳博联特熔融还原科技有限公司 | Secondary combustion equipment for directly reducing in grate kiln |
| CN108332562A (en) * | 2018-03-27 | 2018-07-27 | 中冶北方（大连）工程技术有限公司 | Grate preheating section concurrent heating system |
| CN207963507U (en) * | 2017-11-16 | 2018-10-12 | 武汉科思瑞迪科技有限公司 | A kind of coal base shaft furnace flue gas waste heat recovery system |
| CN109813129A (en) * | 2019-01-04 | 2019-05-28 | 北京科技大学 | One kind being based on circulation of tail gas O2-CO2Combustion-supporting pelletizing production technique and preparation system |
| CN110068225A (en) * | 2019-06-05 | 2019-07-30 | 中冶北方（大连）工程技术有限公司 | A kind of grate upper cover hot-air system and temperature control method |
| CN210486448U (en) * | 2019-09-26 | 2020-05-08 | 中冶北方（大连）工程技术有限公司 | Preheating two-stage hot air supply system of chain grate machine |
-
2019
- 2019-09-26 CN CN201910916240.9A patent/CN110487065A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03281736A (en) * | 1990-03-28 | 1991-12-12 | Kobe Steel Ltd | Combustion method in grate kiln for producing iron-ore pellet |
| CN101932738A (en) * | 2008-03-27 | 2010-12-29 | 株式会社神户制钢所 | The manufacture method of iron ore pellet |
| CN102121786A (en) * | 2011-03-08 | 2011-07-13 | 中冶北方工程技术有限公司 | Hot air system of grate-rotary kiln-circular cooler |
| CN102586592A (en) * | 2012-03-28 | 2012-07-18 | 柳州钢铁股份有限公司 | Method and system for optimizing drying grate-rotary kiln oxidate pellet thermal regulation |
| CN102853680A (en) * | 2012-08-14 | 2013-01-02 | 沈阳博联特熔融还原科技有限公司 | Secondary combustion equipment for directly reducing in grate kiln |
| CN207963507U (en) * | 2017-11-16 | 2018-10-12 | 武汉科思瑞迪科技有限公司 | A kind of coal base shaft furnace flue gas waste heat recovery system |
| CN108332562A (en) * | 2018-03-27 | 2018-07-27 | 中冶北方（大连）工程技术有限公司 | Grate preheating section concurrent heating system |
| CN109813129A (en) * | 2019-01-04 | 2019-05-28 | 北京科技大学 | One kind being based on circulation of tail gas O2-CO2Combustion-supporting pelletizing production technique and preparation system |
| CN110068225A (en) * | 2019-06-05 | 2019-07-30 | 中冶北方（大连）工程技术有限公司 | A kind of grate upper cover hot-air system and temperature control method |
| CN210486448U (en) * | 2019-09-26 | 2020-05-08 | 中冶北方（大连）工程技术有限公司 | Preheating two-stage hot air supply system of chain grate machine |
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