CN207197279U - Circulating flue gas emission-reducing system in sintering machine - Google Patents
Circulating flue gas emission-reducing system in sintering machine Download PDFInfo
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- CN207197279U CN207197279U CN201720928749.1U CN201720928749U CN207197279U CN 207197279 U CN207197279 U CN 207197279U CN 201720928749 U CN201720928749 U CN 201720928749U CN 207197279 U CN207197279 U CN 207197279U
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Abstract
The utility model provides circulating flue gas emission-reducing system in a kind of sintering machine,The system includes sintering machine,Gas mixer and central cooler,Sintering machine includes flue collector,Cycle flue,Head,Middle part and afterbody bellows,Flue collector connects with chimney bottom and middle part bellows,Cycle flue connects with head bellows and afterbody bellows,Oxygen-containing gas is inputted to gas mixer by oxygen-containing gas feed end,Gas mixer connects with cycle flue,Gas outlet connects with sintering device flue gas cover,The high temperature section air outlet of central cooler connects with flue collector,Flue gas in the high-temperature flue gas and flue collector of the discharge of high temperature section exhanst gas outlet carries out heat exchange,Its temperature is set to be higher than dew-point temperature,Middle-temperature section air outlet connects with gas mixer,After the medium temperature flue gas discharged in middle-temperature section exhanst gas outlet mixes in gas mixer with the flue gas in oxygen-containing gas and cycle flue,Sintering machine is returned to recycle.The system can realize the double effect of upgrading volume increase and energy-saving and emission-reduction to greatest extent.
Description
Technical field
Technical field of ferrous metallurgy is the utility model is related to, specifically, is related to a kind of part caused into sintering machine
Oxygen-containing gas is supplemented in flue gas and is delivered to again in sintering machine and is used as recyclegas, and causes caused height in central cooler work
Hot gas is added in sintering machine in caused remaining gas, dew-point temperature is made it higher than, to realize the sintering machine of energy-saving and emission-reduction
Interior circulating flue gas emission-reducing system.
Background technology
The sintering of steel industry is a kind of processing method that " fine fodder " is provided for blast furnace process, and it is will be ready various
Raw material (concentrate, miberal powder, fuel, flux, return mine and iron content production waste material etc.), by a certain percentage by dispensing, mixing and granulation,
Satisfactory sintering feed is obtained, sintering feed produces high temperature by the burning of carbon and the oxidation of iron mineral through lighting a fire, makes sintering
Part composition softening and fusing in material, chemical reaction occurs and generates a number of liquid phase, be mutually bonded to block during cooling, most
The finished product obtained afterwards is referred to as sintering deposit.
Nowadays, country improves constantly to the standard of steel and iron industry disposal of pollutants, along with the place of industry itself, equipment,
The limitation of many aspects such as investment and operation, in traditional sintering process, the mode that tail gas directly discharges is strictly limited.With
The improvement of technique and the innovation of technology, the processing to tail gas also from original direct discharge, recycles to flue gas recirculation
Angle develops.
Flue gas recirculation recycles, and is mainly recycled caused part heat smoke in sintering machine, and again
Sintering machine is discharged into, is utilized as sintering gas circulation.Other flue gases caused by sintering process also obtain respective handling, for example,
Dust in flue gas is by partial adsorbates in the bed of material, and NOx compounds are by Partial digestion , bioxin by high temperature pyrolysis, CO and CH etc.
Second-time burning occurs for compound.So, caused various pollutants in sintering process are effectively controlled, while to caused low temperature
Waste heat is reclaimed, and realizes the purpose of energy-saving and emission-reduction.Found by long-term practice, when circulating flue gas temperature control is 200
DEG C or so and meanwhile its Control for Oxygen Content more than 18% when, flue gas recirculation sintering technology can realize to greatest extent upgrading increase production
With the double effect of energy-saving and emission-reduction.
Position according to the sintering flue gas of selection is different, and existing cycle sintering technique can be divided into interior circulation and outer circulation
Two kinds.Wherein, outer circulation sintering process is that flue gas is shunted after air exhauster, and it, which not only has, transforms the advantages of simple and easy, together
When, flue gas recirculation rate can reach 50%, but the temperature of circulating flue gas is relatively low, and oxygen content does not reach 18% much yet, most
Cause the sintering effect after circulation bad eventually, have impact on the quality of product；For the deficiency of outer circulation sintering process, interior circulation is burnt
Knot technique directly takes wind from the bellows of sintering machine, and it easily can supplement oxygen-containing gas into the wind of taking-up as needed,
Its temperature is kept simultaneously, the oxygen content of circulating flue gas and temperature is reached requirement, but such mode flue gas recirculation rate is low,
It is inadequate to the utilization rate of flue gas, otherwise pipeline can be caused to condense again.
For above-mentioned technical problem, prior art, which is made that, to be correspondingly improved.It is for example, relatively low for circulating flue gas temperature
The problem of, in the prior art, using sintering machine afterbody box temperature it is higher the characteristics of, draw sintering machine wind box tail temperature it is higher
Flue gas, but after long-term use, because the temperature step-down of main bellows, easily make winner's bellows smokejack condensation.In another example
It is another in the prior art, to flue gas cover improve so that its cover sintering machine 50%, by the head of sintering machine wind box and afterbody cigarette
Gas is mixed, but unrecovered complete, and flue gas recirculation rate is still relatively low.A variety of trials of the prior art, all can not be simultaneously
Meet that flue gas requires at two aspects of cycling rate and oxygen content, and it is excessive flue gas cover overlay area to be also present, causes sintering cigarette
The repetitive cycling of gas.
In view of this, existing interior cycle sintering technique should be further improved, to solve above-mentioned technical problem.
Utility model content
In order to solve the above-mentioned technical problem the utility model is made, the purpose is to provide one kind to disclosure satisfy that flue gas
In requirement of both cycling rate and oxygen content so that sintering process realizes upgrading volume increase and energy-saving and emission-reduction simultaneously to greatest extent
Effect.
To achieve these goals, the utility model provides circulating flue gas emission-reducing system in a kind of sintering machine, the system
Including sintering machine, the sintering machine includes flue collector, cycle flue, head bellows, middle part bellows and afterbody bellows, the master
Flue connects with chimney bottom, and the flue collector also connects with the middle part bellows of the sintering machine, the cycle flue with
The head bellows of the sintering machine connect with afterbody bellows, and the system also includes：Gas mixer, pass through oxygen-containing gas
Feed end inputs oxygen-containing gas to the gas mixer, and the gas mixer connect in the cycle flue, gas outlet and
Sintering machine connects；Central cooler, the central cooler are connected with the flue collector and the gas mixer respectively, and its top is provided with
High temperature section exhanst gas outlet and middle-temperature section exhanst gas outlet, the high temperature section exhanst gas outlet connect with the flue collector, the high temperature section
The high-temperature flue gas of exhanst gas outlet discharge carries out heat exchange with the flue gas in the flue collector, its temperature is higher than dew-point temperature, institute
State middle-temperature section exhanst gas outlet to connect with the gas mixer, the medium temperature flue gas discharged in the middle-temperature section exhanst gas outlet is in institute
State after being mixed in gas mixer with the flue gas in the oxygen-containing gas and cycle flue, return to the sintering machine and follow
Ring utilizes.
Preferably, volume adjusting apparatus, the device include the first signal monitoring feedback device, secondary signal monitoring feedback dress
Put and the first triple valve, the second triple valve, the first signal monitoring feedback device be arranged at the gas mixer with
On the pipeline of the sintering machine connection, the secondary signal monitoring feedback device is arranged at the flue collector and connected with the chimney
Pipeline on, first triple valve is arranged between the high temperature section exhanst gas outlet of the central cooler and the flue collector, described
Second triple valve is arranged between the middle-temperature section exhanst gas outlet of the central cooler and the gas mixer, the secondary signal
Monitor the break-make that feedback device controls first triple valve and second triple valve.
Preferably, the head bellows account for the 10% to 20% of the sintering machine entirety bellows length, the middle part bellows,
The 45% to 55% of the sintering machine entirety bellows length is accounted for, the afterbody bellows, accounts for the sintering machine entirety bellows length
30% to 40%, the middle part bellows top is provided with flue gas cover, and the flue gas cover completely covers the middle part bellows.
Preferably, be disposed between the flue collector and the chimney the first deduster, desulfuring and denitrifying apparatus and
Air exhauster, first circulation blower fan and the second dedusting are also disposed between the gas mixer and the cycle flue
Device, motor-driven valve and oxygenating blower fan are disposed between the oxygen-containing gas feed end and the gas mixer.
Preferably, the secondary signal monitoring feedback device monitors the temperature of the flue gas in the flue collector, and according to this
First triple valve described in temperature control, changes the benefit air quantity of the high temperature section exhanst gas outlet of the central cooler, and monitors the circulation
The temperature of flue gas in flue, and the second triple valve according to the temperature control, change the middle-temperature section flue gas of the central cooler
The benefit air quantity of outlet.
Preferably, in the system, the benefit air quantity coincidence formula of the high temperature section smoke outlet on the central cooler：(1-
a)·T1+b·T2≥(1-a+b)·T3, wherein, a is flue gas recirculation rate, and b is the high temperature section smoke outlet on the central cooler
The ratio for mending air quantity and the total exhaust gas volumn of sintering machine, T1For the mean temperature of flue gas in flue collector described in sintering machine, T2For the height
The mean temperature of flue gas at temperature section air outlet, T3To sinter the dew-point temperature of flue gas, i.e. the high temperature section cigarette in the central cooler
Gas outlet, meet that the flue gas in flue collector is more than or equal to dew-point temperature plus the mixing temperature of the flue gas filled into.
Further preferably, in the system, the benefit air quantity of the middle-temperature section smoke outlet on the central cooler meets
Formula：a·x+c1·0.21+c2Y >=(1-a) 0.21, the content of oxygen-containing gas meets public affairs in the gas mixer
Formula：(a·x+c1·0.21+c2·y)≥(a+c1+c2) 0.18, wherein c1For middle-temperature section exhanst gas outlet in the central cooler with
The ratio of the total exhaust gas volumn of sintering machine, c2For oxygen-containing gas in the gas mixer and the ratio of the total exhaust gas volumn of sintering machine, x is
Oxygen content in circulating flue gas, y are the oxygen content in the oxygen-containing gas, and 0.21 is the oxygen content in air, i.e., in the ring
The middle-temperature section smoke outlet of cold, meet that the oxygen flux of circulating flue gas adds the middle-temperature section smoke outlet from the central cooler
The oxygen flux of the gas filled into, along with the oxygen flux of the oxygen-containing gas filled into is more than or equal to discharging gas in the flue collector
The oxygen flux of the air of equivalent, and meet that circulating flue gas adds the middle-temperature section from the central cooler in the gas mixer
The gas that smoke outlet fills into, along with the oxygen-containing gas filled into, the oxygen content in its mixed gas is more than or equal to 0.18.
Preferably, in the system, can be set between the high temperature section exhanst gas outlet and the flue collector of the central cooler
There is central cooler device for generating power by waste heat, the air inlet of the central cooler device for generating power by waste heat is connected with the high temperature section exhanst gas outlet,
Its gas outlet connects with the air inlet of first triple valve, and the first gas outlet and the flue collector of first triple valve connect
Logical, the second gas outlet is connected by second circulation blower fan with the central cooler.
Preferably, it is provided with the three or three on one or more pipelines of the afterbody bellows adjacent with the middle part bellows end
Port valve, described 3rd triple valve one end connect with the flue collector, and the other end connects with the cycle flue.
Preferably, it is provided with the four or three on one or more pipelines of the head bellows adjacent with the middle part bellows head end
Port valve, described 4th triple valve one end connect with the flue collector, and the other end connects with the cycle flue.
Understood as described above with practice, circulation emission-reducing system, will be sintered in sintering machine described in the utility model
Machine bellows are divided into head bellows, middle part bellows and afterbody bellows, because the oxygen content of smoke gas on sintering machine head and afterbody is higher, therefore
The flue gas of head bellows and afterbody bellows is reclaimed, and only needs to be discharged into sintering machine again after filling into a small amount of oxygen-containing gas
Interior to be utilized as sintering gas circulation, on the other hand, because the temperature of bellows is relatively low in the middle part of sintering machine, directly discharge is easily in master
Flue, deduster etc. are internally formed condensation, so the high-temperature flue gas of central cooler front end is imported in flue collector, make in flue collector
Flue-gas temperature rises above its dew-point temperature, so that the temperature of circulating flue gas is higher than 200 DEG C, while ensures its oxygen content
More than 18% and flue gas recirculation rate is improved, solves in the prior art that flue gas recirculation rate is low, circulating flue gas temperature is low, easy condensation
The problem of, to enable the system to realize the double effect of upgrading volume increase and energy-saving and emission-reduction to greatest extent.
Brief description of the drawings
Fig. 1 is schematic diagram, shows circulating flue gas emission-reducing system in the sintering machine described in the utility model embodiment 1
Structure；
Fig. 2 is schematic diagram, shows circulating flue gas emission-reducing system in the sintering machine described in the utility model embodiment 3
Structure；
Fig. 3 is schematic diagram, shows the structure of the interior circulating flue gas emission-reducing system described in the utility model embodiment 4.
Embodiment
The embodiment of circulating flue gas emission-reducing system in sintering machine described in the utility model described below with reference to the accompanying drawings.
One of ordinary skill in the art will recognize, in the case of without departing from spirit and scope of the present utility model, Ke Yiyong
A variety of modes are modified to described embodiment.Therefore, accompanying drawing and description are inherently illustrative, without
It is to be used to limit scope of the claims.In addition, in this manual, accompanying drawing is drawn not in scale, and identical is attached
Icon note represents identical part.
Embodiment 1
Fig. 1 is schematic diagram, shows circulating flue gas emission-reducing system in the sintering machine described in the utility model embodiment 1
Structure.As shown in figure 1, in the embodiment of the present utility model, circulating flue gas emission-reducing system includes burning in described sintering machine
Knot machine 1, central cooler 2, gas mixer 3, volume adjusting apparatus, desulfuring and denitrifying apparatus 4 and chimney 5.Sintering machine 1 includes master
Flue 11 and cycle flue 12, its bellows are divided into head bellows 13, middle part bellows 14 and afterbody bellows 15, and head bellows 13 account for
The 10% to 20% of sintering machine entirety bellows length, middle part bellows 14 account for the 45% to 55% of the overall bellows length of sintering machine 1, tail
Portion's bellows 15 account for the 30% to 40% of the overall bellows length of sintering machine 1, and the top of middle part bellows 14 is provided with flue gas cover 16, flue gas cover
16 complete covering middle part bellows 14.In the embodiment of the present utility model, head bellows 13 account for the 15% of entire length, middle part
Bellows 14 account for the 50% of entire length, and afterbody bellows 15 account for the 35% of entire length.Head bellows 13 and afterbody bellows 15 are with following
Annular smoke flue 12 connects, and middle part bellows 14 connect with flue collector 11.The air outlet of flue collector 11 leads to the bottom of chimney 5, flue collector
11 discharge for flue gas caused by middle part bellows 14 to be led to after chimney 5 from chimney, and cycle flue 12 is used for head bellows 13
With afterbody bellows 15 caused by off-gas recovery utilize, volume adjusting apparatus regulation flue collector 11 and cycle flue 12 air quantity.
Specifically, the top of sintering machine 1 is provided with mixing container 17 and ignition furnace 18, and institute will be sintered from mixing container 17
Need compound import sintering machine 1 in, after by ignition furnace 18 igniting start to sinter.The air outlet of cycle flue 12 leads to gas
Mixing arrangement 3, gas mixer 3 inputs oxygen-containing gas by oxygen-containing gas feed end 31 to the gas mixer 3, oxygen-containing
Motor-driven valve 32 and oxygenating blower fan 33, and gas mixer 3 are disposed between gas feed end 31 and gas mixer 3
Air outlet connected by three and the gas outlet of the above with the flue gas cover 16 on sintering machine 1, cycle flue 12 and gas mixing
The second deduster 6 and circulation air exhauster 7 are disposed with the pipeline that device 3 connects, circulation air exhauster 7 works so that from following
The flue gas of the air outlet discharge of annular smoke flue 12 is discharged into gas mixer 3, by oxygen-containing after the dedusting of the second deduster 6
Gas feed end 31 fills into oxygen-containing gas into gas mixer 3, and circulating flue gas is with oxygen-containing gas in gas mixer 3
After mixing, connected by the exhanst gas outlet of three and the above with the air inlet of the flue gas cover 16 of sintering machine, be passed through in sintering machine 1 and make
Used for sintering gas.In the embodiment of the present utility model, oxygen-containing gas can be air, or industrial pure oxygen.
Flue collector 11 leads on the pipeline of the bottom of chimney 5, along flow of flue gas direction, is disposed with the first deduster 8, master
Air exhauster 9 and desulfuring and denitrifying apparatus 4.The flue gas discharged from middle part bellows 14 is drained into flue collector 11, then, main exhauster
9 work, make the flue gas in flue collector 11 after the dedusting of the first deduster 8, are carried out into desulfuring and denitrifying apparatus 4 at desulphurization denitration
Reason, finally enter from the bottom of chimney 5 in chimney 5, finally discharge.
Central cooler 2 connects with flue collector 11 and gas mixer 3 respectively, specifically, to sintering deposit inside central cooler 2
Cooled down, gas temperature caused by its interior forward end is higher, and gas temperature caused by middle part and afterbody is relatively low, then in central cooler
2 tops are correspondingly arranged on high temperature section exhanst gas outlet 21 and middle-temperature section exhanst gas outlet 22, and it is cold that high temperature section exhanst gas outlet 21 is arranged at ring
The front end of machine 2, middle-temperature section exhanst gas outlet 22 are arranged at the middle part of central cooler 2.High temperature section exhanst gas outlet 21 connects with flue collector 11,
The high-temperature flue gas of discharge carries out heat exchange with the flue gas in flue collector 11 in high temperature section exhanst gas outlet 21 so that in flue collector 11
Flue-gas temperature rises, and is higher than its dew-point temperature, and the dew condensation phenomenon that can be effectively prevented from flue collector and chimney breast occurs.
Middle-temperature section exhanst gas outlet 22 connects with gas mixer 3, and the gas discharged from middle-temperature section exhanst gas outlet 22 enters gas and mixed
Attach together and put in 3, mixed with circulating flue gas therein and oxygen-containing gas.In the embodiment of the present utility model, on central cooler 2
The pipeline that is connected with gas mixer 3 of middle-temperature section exhanst gas outlet 22 on can also be provided with auxiliary air exhauster 23.
Volume adjusting apparatus adjusts the air quantity of flue collector 11 and cycle flue 12.Specifically, volume adjusting apparatus includes
First signal monitoring feedback device 100 and secondary signal monitoring feedback device 200, and the first triple valve 300 and the second threeway
Valve 400.First signal monitoring feedback device 100 is arranged on the pipeline that gas mixer 3 connects with sintering machine 1, for supervising
Control and the air quantity of the regulation air outlet of gas mixer 3.Secondary signal monitoring feedback device 200 is arranged at flue collector 11 and chimney
On the pipeline of 5 connections, first triple valve 300 is arranged between high temperature section exhanst gas outlet 21 and flue collector 11, the first threeway
The air inlet of valve 300 is connected with high temperature section exhanst gas outlet 21, and the first gas outlet is connected with flue collector 11, the second gas outlet and outside
Environment or waste-heat recovery device connection, the second triple valve 400 be arranged at middle-temperature section exhanst gas outlet 22 and gas mixer 3 it
Between, the air inlet of the second triple valve 400 is connected with middle-temperature section exhanst gas outlet 22, and the first gas outlet is by aiding in air exhauster 23 and gas
Body mixing arrangement 3 connects, and the second gas outlet connects with external environment condition or waste-heat recovery device.Secondary signal monitors feedback device
200 break-make for monitoring and adjusting the first triple valve 300 and the second triple valve 400, to control the air quantity in flue collector 11.
Secondary signal monitoring feedback device 200 monitors the temperature at high temperature section exhanst gas outlet 21 and at middle-temperature section exhanst gas outlet 22
Degree, and the benefit air quantity of high temperature section exhanst gas outlet 21 should comply with formula：(1-a)·T1+b·T2≥(1-a+b)·T3, wherein, a
For flue gas recirculation rate, b is the benefit air quantity and the ratio of the total exhaust gas volumn of sintering machine of the high temperature section smoke outlet on the central cooler,
T1For the mean temperature of flue gas in Main Gas Flue of Sintering Machine 11, T2For the mean temperature of the flue gas at high temperature section exhanst gas outlet 21, T3For
The dew-point temperature of flue gas is sintered, i.e., at the high temperature section exhanst gas outlet 21 of central cooler 2, meets the flue gas in flue collector 11 plus benefit
The mixing temperature of the flue gas entered is more than or equal to the dew-point temperature of flue gas.Meanwhile at the middle-temperature section exhanst gas outlet 22 on central cooler 2
Mend air quantity coincidence formula：a·x+c1·0.21+c2Y >=(1-a) 0.21, the content of oxygen-containing gas in gas mixer 3
Coincidence formula：(a·x+c1·0.21+c2·y)≥(a+c1+c2) 0.18, wherein c1For middle-temperature section exhanst gas outlet in central cooler 2
22 with the ratio of 1 total exhaust gas volumn of sintering machine, c2For the ratio of oxygen-containing gas in gas mixer 3 and 1 total exhaust gas volumn of sintering machine,
X is the oxygen content in circulating flue gas, and y is the oxygen content in oxygen-containing gas, and 0.21 is the oxygen content in air, i.e., in middle-temperature section cigarette
Gas outlet, meet that the oxygen flux of circulating flue gas adds the oxygen flux of the gas filled at middle-temperature section exhanst gas outlet 22, then add
On the oxygen flux of oxygen-containing gas that fills into be more than or equal to the oxygen flux of the air with discharging gas equivalent in flue collector 11, and in gas
It is oxygenous plus filling into meet that circulating flue gas adds the gas filled at middle-temperature section exhanst gas outlet 22 in body mixing arrangement 3
Body, the oxygen content in its mixed gas are more than or equal to 0.18.Secondary signal monitoring feedback device 200 monitors the temperature in respective line
Degree, and control the break-make of the first triple valve 300 and the second triple valve 400.
In actual production, exemplified by being produced by taking the interior circulating flue gas emission-reducing system according to 460 ㎡ as an example, sintering machine 1
The flue gas averaged Oxygen content of portion's bellows 13 is about 16%, and mean temperature is about 80 DEG C, and the flue gas averaged oxygen in afterbody bellows 15 contains
Amount about 18%, mean temperature is about 300 DEG C, and after the flue gas mixing of head bellows 13 and afterbody bellows 15, mean temperature is higher than
200 DEG C, but oxygen content is significantly lower than 18%.Flue gas mean temperature in middle part bellows 14 is about 70 DEG C, and table 1 is in this practicality
In new embodiment 1, the supplement gas of flue gas in circulating flue gas and flue collector is used as using normal temperature air or industrial pure oxygen respectively
Related data during body, wherein assume that oxygen-containing gas temperature is 30 DEG C, the flue gas temperature at the high temperature section exhanst gas outlet 21 of central cooler 2
Spend for 400 DEG C, the flue-gas temperature at middle-temperature section exhanst gas outlet 22 is 300 DEG C.
The circulating flue gas of table 1 and discharged gas fume mend wind parameter
As it can be seen from table 1 during using air or central cooler medium temperature flue gas as the benefit wind of circulating flue gas, air quantity is mended
(8.57%) industrial pure oxygen (1.8%) is much larger than, mixed oxygen content of smoke gas (18.13%) is then less than industrial pure oxygen
(20.27%) about 2%；Using central cooler medium temperature flue gas as circulating flue gas mend wind when mixed flue gas temperature highest, with industry
Take second place during pure oxygen；After carrying out benefit wind to circulating flue gas with different benefit wind regimes, the benefit air quantity of discharged gas fume is close to 10%, wherein only
It is lower slightly during using industrial pure oxygen, that is to say, that when flue gas recirculation rate of the present utility model reaches 50%, actual discharged gas fume subtracts
It is about 40% that row, which leads,.
Table 2 is influence data of the flue-gas temperature of central cooler high temperature section exhanst gas outlet 21 to flue collector discharged gas fume emission reduction rate.
Influence of the central cooler high-temperature flue-gas of table 2 to discharged gas fume emission reduction rate
Draw with reference to Tables 1 and 2, when the flue-gas temperature at the middle-temperature section exhanst gas outlet 22 of central cooler 2 is higher than 350 DEG C, follow
Mixing temperature after ring flue gas benefit wind reaches 250 DEG C, and secondary signal monitoring feedback device 200 is monitored at middle-temperature section exhanst gas outlet 22
Flue-gas temperature, and control the second triple valve 400 break-make.In addition, the mixing temperature of circulating flue gas mends wind with normal temperature air
The increase of ratio and reduce, change between 243.66 DEG C to 204.15 DEG C；The benefit air quantity of circulating flue gas is mended with industrial pure oxygen
The increase of wind ratio and reduce, fluctuated in the range of 1.8% to 8.57%.Circulating flue gas is carried out with different benefit wind sources
When mending wind, the high temperature section exhanst gas outlet of central cooler 2 it is temperature-resistant in the case of, the benefit air quantity of the discharged gas fume of flue collector 11 with
The temperature of the high temperature section exhanst gas outlet 21 of central cooler 2 is raised and reduced, and the emission reduction rate of the discharged gas fume of flue collector is then with central cooler 2
The temperature of high temperature section exhanst gas outlet 21 is raised and raised.Specifically：
(1) when the flue-gas temperature fluctuation of the middle-temperature section smoke outlet of central cooler 2, to the benefit air quantity of circulating flue gas without shadow
Ring, the mixing oxygen content after mending wind to circulating flue gas is also without influence, and the mixing temperature after circulating flue gas benefit wind is with central cooler 2
The reduction of the flue-gas temperature of middle-temperature section smoke outlet and reduce；When the flue-gas temperature of the middle-temperature section smoke outlet of central cooler 2 surpasses
When crossing 350 DEG C, circulating flue gas mends the mixing temperature after wind and reaches 250 DEG C, i.e. the flue gas of the middle-temperature section smoke outlet of central cooler 2
Peak temperature is advisable with 350 DEG C；
(2) wind source is mended as circulating flue gas according to normal temperature air and the middle-temperature section flue gas of central cooler 2, when both mend wind ratio
During example fluctuation, on the benefit air quantity of circulating flue gas without influence, the mixing oxygen content after mending wind to circulating flue gas circulates also without influence
Mixing temperature after flue gas benefit wind fluctuates between 204.15 DEG C~243.66 DEG C, and as normal temperature air mends the increase of wind ratio
And reduce；
(3) wind source is mended as circulating flue gas according to normal temperature air and industrial pure oxygen, when both mend wind rate fluctuations,
The benefit air quantity of circulating flue gas fluctuates between 1.8%~8.57%, and is reduced as industrial pure oxygen mends the increase of wind ratio；Follow
Mixing oxygen content and temperature after ring flue gas benefit wind are respectively between 18.13%~20.27% and 204.15 DEG C~226.91 DEG C
Fluctuation, and increase as industrial pure oxygen mends the increase of wind ratio；
(4) wind source is mended as circulating flue gas according to industrial pure oxygen and central cooler medium temperature flue gas, when both mend wind ratio
During fluctuation, the benefit air quantity of circulating flue gas fluctuates between 1.8%~8.57%, and with industrial pure oxygen mend wind ratio increase and
Reduce；Mixing oxygen content after circulating flue gas benefit wind fluctuates between 18.13%~20.27%, and as industrial pure oxygen mends wind
The increase of ratio and increase；Mixing temperature after circulating flue gas benefit wind fluctuates between 226.91 DEG C~243.66 DEG C, and with
Industrial pure oxygen is mended the increase of wind ratio and reduced；
(5) wind source is mended as circulating flue gas according to normal temperature air, industrial pure oxygen and central cooler medium temperature flue gas, works as three
When mending wind rate fluctuations, the benefit air quantity of circulating flue gas fluctuates between 1.8%~8.57%, and as industrial pure oxygen mends wind ratio
Increase and reduce, it is unrelated with the relative complement wind ratio of normal temperature air and central cooler medium temperature flue gas；It is mixed after circulating flue gas benefit wind
Close oxygen content to fluctuate between 18.13%~20.27%, and increase as industrial pure oxygen mends the increase of wind ratio, with normal temperature
The relative complement wind ratio of air and central cooler medium temperature flue gas is unrelated；Circulating flue gas mend wind after mixing temperature 204.15 DEG C~
Fluctuate between 243.66 DEG C, and reduced as normal temperature air mends the increase of wind ratio.
Embodiment 2
Referring to Fig. 1, in embodiment 1, head bellows 13 account for the 15% of entire length, and middle part bellows 14 account for entire length
50%, afterbody bellows 15 account for the 35% of entire length.In example 2, middle part bellows 14 can be kept constant, head bellows 13
Length account for the ratio of entire length and be not less than 10%, accordingly, the ratio that the length of afterbody bellows 15 accounts for entire length is not high
In 40%, now, reduced with the length of head bellows 14, the temperature of the circulating flue gas of sintering machine 1 gradually rises, and oxygen content is slightly
Reduce, when now being produced using the system condition described in embodiment 1, the benefit air quantity of the middle-temperature section exhanst gas outlet 22 of central cooler 2
Reduce, and the increase of the benefit air quantity of the oxygen-containing gas of oxygen-containing gas feed end 31.
Embodiment 3
In order to realize making full use of for residual heat resources, the pipe that can also be connected in high temperature section exhanst gas outlet 21 with flue collector 11
Central cooler device for generating power by waste heat 24 is set on road.Fig. 2 is schematic diagram, shows the sintering described in the utility model embodiment 2
The structure of circulating flue gas emission-reducing system in machine.Specifically, as shown in Fig. 2 the air inlet of central cooler device for generating power by waste heat 24 with
High temperature section exhanst gas outlet 21 is connected, and its gas outlet connects with the air inlet of the first triple valve 300, and the first of the first triple valve 300
Gas outlet is connected with flue collector 11, and the second gas outlet is connected by circulating fan 301 with central cooler 2.High temperature section exhanst gas outlet 21
Locate the high-temperature gas of discharge, be introduced into central cooler device for generating power by waste heat 24 and carry out heat exchange, the cryogenic gas part after exchange
Central cooler 2 is expelled back into by the second gas outlet of the first triple valve 300 it is used as cooling gas and recycle, another part passes through
First gas outlet of one triple valve 300 is discharged into flue collector 11 and mixed with the flue gas in flue collector 11.In embodiment 2 with embodiment 1
Identical part will not be repeated here.
Embodiment 4
Fig. 3 is schematic diagram, shows the structure of the interior circulating flue gas emission-reducing system described in the utility model embodiment 3.
Specifically, as shown in figure 3, on one or more branch pipe adjacent with the end of bellows 14 in the middle part of sintering machine on afterbody bellows 15
3rd triple valve 500 and the 4th triple valve 600 are set, and the 3rd triple valve one end and the entrance side of sintering machine cycle flue 12 connect
The inlet side communication of the logical, other end and the flue collector 11 of sintering machine 1, the one end of the 4th triple valve 600 connect with flue collector 11, the other end
Connected with cycle flue 12.In addition, approx, in other embodiment of the present utility model, on head bellows 13 with sintering
3rd triple valve 500, its one end and sintering can also be set on one or more adjacent branch pipe of machine 1 middle part bellows, 14 head ends
The inlet side communication of the inlet side communication of machine cycle flue 12, the other end and the flue collector 11 of sintering machine 1.Height described in the present embodiment
Ratio sinters flue gas internal circulation system, and flue gas recirculation technique can be made to realize rationally control according to the fluctuation of production status.It is real
Part same as Example 3 in example 4 is applied to will not be repeated here.
Understood as described above with practice, circulation emission-reducing system, will be sintered in sintering machine described in the utility model
Machine bellows are divided into head bellows, middle part bellows and afterbody bellows, because the oxygen content of smoke gas on sintering machine head and afterbody is higher, therefore
The flue gas of head bellows and afterbody bellows is reclaimed, and only needs to be discharged into sintering machine again after filling into a small amount of oxygen-containing gas
Interior to be utilized as sintering gas circulation, on the other hand, because the temperature of bellows is relatively low in the middle part of sintering machine, directly discharge is easily in master
Flue, deduster, air exhauster etc. are internally formed condensation, so the high-temperature flue gas of central cooler front end is imported in flue collector, make master
Flue-gas temperature in flue rises above its dew-point temperature, so that the temperature of circulating flue gas is higher than 200 DEG C, ensures simultaneously
Its oxygen content, which is more than, 18% and improves flue gas recirculation rate, solve in the prior art flue gas recirculation rate is low, circulating flue gas temperature is low,
Easily the problem of condensation, to enable the system to realize the double effect of upgrading volume increase and energy-saving and emission-reduction to greatest extent.
Describe above with reference to accompanying drawing and subtracted according to circulating flue gas in sintering machine described in the utility model in an illustrative manner
Heat-extraction system.It will be understood by those skilled in the art, however, that circulating flue gas in the sintering machine proposed for above-mentioned the utility model
Emission-reducing system, various improvement can also be made on the basis of the utility model content is not departed from.Therefore, guarantor of the present utility model
Shield scope should be determined by the content of appended claims.
Claims (10)
1. circulating flue gas emission-reducing system in a kind of sintering machine, it is characterised in that the system includes sintering machine, and the sintering machine includes
Flue collector, cycle flue, head bellows, middle part bellows and afterbody bellows, the flue collector connect with chimney bottom, the master
Flue also connects with the middle part bellows of the sintering machine, the head bellows of the cycle flue and the sintering machine and
Afterbody bellows connect, and the system also includes：
Gas mixer, oxygen-containing gas, gas mixing dress are inputted to the gas mixer by oxygen-containing gas feed end
Put and connected with the cycle flue, gas outlet connects with sintering device flue gas cover；
Central cooler, the central cooler connect with the flue collector and the gas mixer respectively, and its top is provided with high temperature section
Exhanst gas outlet and middle-temperature section exhanst gas outlet, the high temperature section exhanst gas outlet connect with the flue collector, and the high temperature section flue gas goes out
The high-temperature flue gas of mouth discharge carries out heat exchange with the flue gas in the flue collector, its temperature is higher than dew-point temperature, the medium temperature
Section exhanst gas outlet connects with the gas mixer, and the medium temperature flue gas discharged in the middle-temperature section exhanst gas outlet is in the gas
After being mixed in mixing arrangement with the flue gas in the oxygen-containing gas and cycle flue, return to the sintering machine and recycle.
2. circulating flue gas emission-reducing system in sintering machine as claimed in claim 1, it is characterised in that the system also includes air quantity and adjusted
Regulating device, the volume adjusting apparatus include the first signal monitoring feedback device, secondary signal monitoring feedback device and the one or three
Port valve, the second triple valve, the first signal monitoring feedback device are arranged at the gas mixer and connected with the sintering machine
On logical pipeline, the secondary signal monitoring feedback device is arranged on the pipeline that the flue collector connects with the chimney, institute
State the first triple valve to be arranged between the high temperature section exhanst gas outlet and the flue collector, second triple valve is arranged at described
Between middle-temperature section exhanst gas outlet and the gas mixer, the secondary signal monitoring feedback device controls first threeway
The break-make of valve and second triple valve.
3. circulating flue gas emission-reducing system in sintering machine as claimed in claim 1, it is characterised in that the head bellows account for described
The 10% to 20% of sintering machine entirety bellows length, the middle part bellows account for the 45% of the sintering machine entirety bellows length to
55%, the afterbody bellows account for the 30% to 40% of the sintering machine entirety bellows length, are provided with above the middle part bellows
Flue gas cover, the flue gas cover completely cover the middle part bellows.
4. circulating flue gas emission-reducing system in sintering machine as claimed in claim 1, it is characterised in that the flue collector and the cigarette
The first deduster, desulfuring and denitrifying apparatus and air exhauster, the gas mixer and the circulation are disposed between chimney
First circulation blower fan and the second deduster, the oxygen-containing gas feed end and the gas mixing are also disposed between flue
Motor-driven valve and oxygenating blower fan are disposed between device.
5. circulating flue gas emission-reducing system in sintering machine as claimed in claim 2, it is characterised in that the secondary signal monitoring is anti-
The temperature of the flue gas described in assembly monitor in flue collector, and the first triple valve according to the temperature control are presented, changes the height
The benefit air quantity of temperature section exhanst gas outlet, and the temperature of the flue gas in the cycle flue is monitored, and according to the temperature control
Two triple valves, change the benefit air quantity of the middle-temperature section exhanst gas outlet.
6. circulating flue gas emission-reducing system in sintering machine as claimed in claim 5, it is characterised in that in the system, the ring
The benefit air quantity coincidence formula of high temperature section smoke outlet in cold：(1-a)·T1+b·T2≥(1-a+b)·T3, wherein, a is
Flue gas recirculation rate, b mend air quantity and the ratio of the total exhaust gas volumn of sintering machine, T for the high temperature section smoke outlet on the central cooler1
For the mean temperature of flue gas in flue collector described in sintering machine, T2For the mean temperature of the flue gas of the high temperature section smoke outlet, T3
To sinter the dew-point temperature of flue gas, i.e. the high temperature section smoke outlet in the central cooler, meet that the flue gas in flue collector adds
The mixing temperature of the flue gas filled into is more than or equal to dew-point temperature.
7. circulating flue gas emission-reducing system in sintering machine as claimed in claim 5, it is characterised in that in the system, the ring
The benefit air quantity coincidence formula of middle-temperature section smoke outlet in cold：a·x+c1·0.21+c2Y >=(1-a) 0.21, it is described
The content coincidence formula of oxygen-containing gas in gas mixer：(a·x+c1·0.21+c2·y)≥(a+c1+c2) 0.18, its
Middle c1For middle-temperature section exhanst gas outlet in the central cooler and the ratio of the total exhaust gas volumn of sintering machine, c2For in the gas mixer
Oxygen-containing gas and the ratio of the total exhaust gas volumn of sintering machine, x are the oxygen content in circulating flue gas, and y is that the oxygen in the oxygen-containing gas contains
Amount, 0.21 is the oxygen content in air, i.e. the middle-temperature section smoke outlet in the central cooler, meets the oxygen flux of circulating flue gas
Plus the oxygen flux of the gas filled into from the central cooler middle-temperature section smoke outlet, along with the oxygen of the oxygen-containing gas filled into leads to
Amount is more than or equal to the oxygen flux of the air with discharging gas equivalent in the flue collector, and meets in the gas mixer
Circulating flue gas adds the gas filled into from the central cooler middle-temperature section smoke outlet, and along with the oxygen-containing gas filled into, it is mixed
The oxygen content closed in gas is more than or equal to 0.18.
8. circulating flue gas emission-reducing system in sintering machine as claimed in claim 1, it is characterised in that in the system, the height
Central cooler device for generating power by waste heat is provided between temperature section exhanst gas outlet and the flue collector, the central cooler device for generating power by waste heat enters
Gas port is connected with high temperature section exhanst gas outlet, and its gas outlet connects with the air inlet of the first triple valve, and the first of the first triple valve goes out
Gas port is connected with flue collector, and the second gas outlet is connected by second circulation blower fan with central cooler.
9. circulating flue gas emission-reducing system in sintering machine as claimed in claim 1, it is characterised in that with the middle part bellows end
The 3rd triple valve, described 3rd triple valve one end and the main cigarette are provided with one or more pipelines of adjacent afterbody bellows
Road connects, and the other end connects with the cycle flue.
10. circulating flue gas emission-reducing system in sintering machine as claimed in claim 1, it is characterised in that first with the middle part bellows
Hold and the 4th triple valve is provided with one or more pipelines of adjacent head bellows, described 4th triple valve one end and the master
Flue connects, and the other end connects with the cycle flue.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720928749.1U CN207197279U (en) | 2017-07-28 | 2017-07-28 | Circulating flue gas emission-reducing system in sintering machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720928749.1U CN207197279U (en) | 2017-07-28 | 2017-07-28 | Circulating flue gas emission-reducing system in sintering machine |
Publications (1)
| Publication Number | Publication Date |
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| CN207197279U true CN207197279U (en) | 2018-04-06 |
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ID=61799043
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|---|---|---|---|
| CN201720928749.1U Active CN207197279U (en) | 2017-07-28 | 2017-07-28 | Circulating flue gas emission-reducing system in sintering machine |
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| Country | Link |
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| CN (1) | CN207197279U (en) |
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2017
- 2017-07-28 CN CN201720928749.1U patent/CN207197279U/en active Active
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Effective date of registration: 20220608 Address after: 243000 Fu Chang Industrial Park, 259 HSI Nan Road, Ma'anshan economic and Technological Development Zone, Anhui Patentee after: HUATIAN ENGINEERING & TECHNOLOGY CORPORATION, MCC Patentee after: HUATIAN NANJING ENGINEERING & TECHNOLOGY CORPORATION, MCC Address before: 243000 Fu Chang Industrial Park, 259 HSI Nan Road, Ma'anshan economic and Technological Development Zone, Anhui Patentee before: HUATIAN ENGINEERING & TECHNOLOGY CORPORATION, MCC Patentee before: HUATIAN NANJING ENGINEERING & TECHNOLOGY CORPORATION, MCC Patentee before: MCC HUATIAN (ANHUI) ENERGY SAVING ENVIRONMENTAL PROTECTION RESEARCH INSTITUTE Co.,Ltd. |
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