CN208320483U - A kind of grate kiln denitrating system - Google Patents
A kind of grate kiln denitrating system Download PDFInfo
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- CN208320483U CN208320483U CN201820690462.4U CN201820690462U CN208320483U CN 208320483 U CN208320483 U CN 208320483U CN 201820690462 U CN201820690462 U CN 201820690462U CN 208320483 U CN208320483 U CN 208320483U
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- grate
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- denitrating system
- preheating section
- exhanst gas
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Abstract
The utility model provides a kind of grate kiln denitrating system, grate kiln denitrating system includes sequentially connected drying grate, rotary kiln and ring cold machine, drying grate includes sequentially connected blasting drying period, down-draft drying zone, first preheating section and the second preheating section, denitrating system further includes the Benitration reactor outside drying grate, second preheating section has exhanst gas outlet, down-draft drying zone has smoke inlet, Benitration reactor is connected between the exhanst gas outlet of the second preheating section and the smoke inlet of down-draft drying zone, reducing agent injection apparatus is also connected between Benitration reactor and the exhanst gas outlet of the second preheating section.The utility model is not necessarily to carry out heat temperature raising to flue gas, can be energy saving, improves denitration efficiency.
Description
Technical field
The utility model relates to grate kiln technical field, especially a kind of grate kiln denitrating system.
Background technique
With the development of national economy and the increasingly raising of living standards of the people, it is more and more that environmental problem obtains people
Pay attention to, and nitrogen oxides is constantly subjected to paying close attention to for country as the pollutant closely related with air quality.According to China
Chinese Ministry of Environmental Protection's statistical data, whole nation industrial gas emission NOx is 1180.9 ten thousand tons total within 2015, wherein ferrous metal smelting and calendering
1,040,000 tons of processing discharge, is one of three big emission sources.The sintering of iron and steel enterprise's (ferrous metal smelting) and pelletizing process are emphasis
NOx emission source, the publication of in June, 2017 China's Environmental Protection Department " about soliciting, " arrange by steel sintering, pelletizing industrial air pollution object
Put standard " etc. 20 National Emission Standards modify the letter of single (exposure draft) opinion [ring do atmosphere letter [2017] 924
Number] ", it is desirable that will sintering and pelletizing nitrogen oxides in effluent discharge index from existing 300mg/Nm3It is revised as 100mg/Nm3；And
Many provinces and cities of China in 2018 are even more to require discharged nitrous oxides to be set in 50mg/Nm3。
Grate kiln is domestic most important large-scale pelletizing production technique, and nitrogen oxides in effluent concentration of emission is logical
Often in 200mg/Nm3~400mg/Nm3, smog discharge temperature is mostly 100 DEG C~180 DEG C, it is clear that discharged nitrous oxides concentration can not
Reach the index request in modification list, it is necessary to add denitration facility.
After the first prior art draws whole flue gases, by heat exchanger and heating device, smoke temperature is increased laggard
Row SCR (SCR technology) denitration.It has the disadvantage that the application temperature range due to SCR denitration usually exists
300 DEG C~420 DEG C, and the flue-gas temperature of grate-kiln pelletizing process technique is lower, it is therefore desirable to whole flue gases are heated up
To carry out SCR denitration, to consume many energy, operating cost is higher；In addition whole system is more complicated, and equipment is more, behaviour
Make and maintenance is complicated.
Second of prior art sprays into reducing agent to drying grate high temperature smoke-gas area, uses SNCR (selective non-catalytic
Reduction technique) denitration.Although it has the disadvantage that drying grate high temperature smoke-gas area is able to satisfy SNCR reaction required temperature,
But compared to regions such as the SNCR boiler furnaces routinely applied, drying grate high-temperature area space is very narrow, is not enough to make SNCR complete
At abundant reaction, therefore, it is difficult to effectively realize denitration；Even if on the other hand SNCR has suitable conversion zone and reaction time, take off
Nitre efficiency only 30~50%, according to usual pelletizing nitrogen oxides 200mg/Nm3~400mg/Nm3Concentration range, cannot achieve most
New discharge index.
Utility model content
The purpose of the utility model is to provide a kind of grate kiln denitrating systems, to solve of the existing technology disappear
Consume the problem that the energy is high, denitration efficiency is low.
In order to achieve the above objectives, the utility model proposes a kind of grate kiln denitrating system, the drying grate revolutions
Kiln denitrating system includes sequentially connected drying grate, rotary kiln and ring cold machine, and the drying grate includes that sequentially connected air blast is dry
Dry section, down-draft drying zone, the first preheating section and the second preheating section, second preheating section are connect with the rotary kiln；The chain
Comb machine rotary kiln denitrating system further includes the Benitration reactor outside the drying grate, and second preheating section has flue gas
Outlet, the down-draft drying zone have smoke inlet, and the Benitration reactor is connected to the exhanst gas outlet of second preheating section
Between the smoke inlet of the down-draft drying zone, between the Benitration reactor and the exhanst gas outlet of second preheating section also
It is connected with reducing agent injection apparatus.
Grate kiln denitrating system as described above, wherein the Benitration reactor and second preheating section
Heat resisting exhauster is also connected between exhanst gas outlet.
Grate kiln denitrating system as described above, wherein between the heat resisting exhauster and the Benitration reactor
It is also connected with booster fan.
Grate kiln denitrating system as described above, wherein the down-draft drying zone and first preheating section are equal
With exhanst gas outlet, the exhanst gas outlet of the exhanst gas outlet of the down-draft drying zone and first preheating section with a main exhauster
Connection, the main exhauster connect a chimney.
Grate kiln denitrating system as described above, wherein the Benitration reactor is SCR reactor.
Grate kiln denitrating system as described above, wherein be filled with middle temperature catalyst in the Benitration reactor
Layer.
Grate kiln denitrating system as described above, wherein the middle temperature catalyst layer be honeycombed catalyst or
Board-like catalyst.
Grate kiln denitrating system as described above, wherein the ring cold machine has sequentially connected first cooling
Section, the second cooling section and third cooling section, first cooling section are located at the discharging close to the rotary kiln of the ring cold machine
One end of mouth；First cooling section has exhanst gas outlet, and first preheating section has smoke inlet, first cooling section
Exhanst gas outlet and first preheating section smoke inlet between be connected with first pipe；Second cooling section and described
Three cooling sections all have exhanst gas outlet, and the blasting drying period has a smoke inlet, the exhanst gas outlet of second cooling section and
Second pipe is connected between the exhanst gas outlet of the third cooling section and the smoke inlet of the blasting drying period.
Grate kiln denitrating system as described above, wherein be connected with air blower on the second pipe.
Grate kiln denitrating system as described above, wherein the blasting drying period has for discharging flue gas
Exhanst gas outlet.
The characteristics of grate kiln denitrating system of the utility model and advantage are:
1, the grate kiln denitrating system of the utility model chooses the high-temperature flue gas in the second preheating section as denitration
Process object, the high-temperature flue gas in the second preheating section is led to outside drying grate, carries out denitration using Benitration reactor, due to
The flue-gas temperature drawn out of second preheating section is higher, without to flue gas carry out heat temperature raising, it is energy saving, reduce operation at
This；In addition, carrying out denitration process to flue gas by the way that Benitration reactor is arranged outside drying grate, reaction compartment is big, denitration reaction
More sufficiently, denitration efficiency is higher, is able to satisfy discharged nitrous oxides concentration requirement, denitrating system structure is simple, operation and maintenance side
Just；
2, the grate kiln denitrating system of the utility model, the high flue gas of selective selection NOx concentration are taken off
Nitre processing, rather than denitration process is carried out to whole flue gases, which drops significantly less than the half of final discharge exhaust gas volumn
Low denitrating system investment and operating cost.
Detailed description of the invention
Following drawings are only intended to schematically illustrate and explain the present invention, does not limit the model of the utility model
It encloses.Wherein:
Fig. 1 is the structural schematic diagram of the grate kiln denitrating system of the utility model.
Main element label declaration:
1 drying grate
11 blasting drying period, 12 down-draft drying zone
13 first preheating section, 14 second preheating section
2 rotary kilns
3 ring cold machines
31 first cooling section, 32 second cooling section
33 third cooling sections
4 Benitration reactors
5 reducing agent injection apparatus
6 heat resisting exhausters
7 main exhausters
8 chimneys
9 air blowers
101 first pipes
102 second pipes
Specific embodiment
For a clearer understanding of the technical features, objectives and effects of the utility model, now compareing Detailed description of the invention
Specific embodiment of the present utility model.
As shown in Figure 1, the utility model provides a kind of grate kiln denitrating system, or selected for grate kiln
Selecting property denitrating system comprising sequentially connected drying grate 1, rotary kiln 2 and ring cold machine 3, drying grate 1 is for drying, preheating life
Pelletizing, rotary kiln 2 are used to roast the pelletizing after the preheating of drying grate 1, and ring cold machine is for the cooling ball roasted by rotary kiln 2
Group；
Drying grate 1 includes sequentially connected blasting drying period 11, down-draft drying zone 12, the first preheating section 13 and the second preheating
Section 14, the second preheating section 14 is connect with rotary kiln 2, and the temperature of the second preheating section 14 is higher than blasting drying period 11, down-draft drying zone
12 and first any one in preheating section 13 temperature, therefore the first preheating section 13 is alternatively referred to as medium temperature preheating section, the second preheating section
14 are alternatively referred to as high temperature preheating section, are the main places for generating NOx, and NOx concentration is higher；
Grate kiln denitrating system further includes 4 second preheating section 14 of the Benitration reactor tool outside drying grate 1
Have an exhanst gas outlet, down-draft drying zone 12 has a smoke inlet, Benitration reactor 4 be connected to the exhanst gas outlet of the second preheating section 14 with
Between the smoke inlet of down-draft drying zone 12, use is also connected between Benitration reactor 4 and the exhanst gas outlet of the second preheating section 14
In the reducing agent injection apparatus 5 to flue gas injection reducing agent, the inlet of Benitration reactor 4 is arranged in reducing agent injection apparatus 5,
Wherein the structure and working principle of Benitration reactor 4 and reducing agent injection apparatus 5 can be found in the prior art.
The grate kiln denitrating system of the utility model selects the flue gas in the second preheating section 14 as denitration process
The higher flue gas of temperature in second preheating section 14 is led to outside drying grate 1, is taken off using Benitration reactor 4 by object
Nitre, since the flue-gas temperature drawn out of second preheating section 14 is higher, without carrying out heat temperature raising to flue gas, energy saving, drop
Low operating cost, and by sending the flue gas after denitration process in drying grate 1 back to, the heat of this partial fume can also be recycled
Amount, it is energy saving；
In addition, by the way that Benitration reactor 4 is arranged outside drying grate 1, to the high-temperature flue gas drawn from the second preheating section 14
Denitration process is carried out, reaction compartment is big, and denitration reaction is more abundant, and denitration efficiency is higher, and since the NOx of the partial fume is dense
Degree is higher, and the denitration efficiency of high concentrate NOx flue gas is up to 80%~90%；
In addition, the denitrating system structure of the utility model is simple, operation and maintenance is convenient.
For example, the temperature of blasting drying period 11, down-draft drying zone 12 and the first preheating section 13 is below 400 DEG C, air blast is dry
Dry section 11, NOx concentration is lower than 50mg/Nm in the flue gas of down-draft drying zone 12 and the first preheating section 133, NOx, nothing are not generated substantially
It need to carry out denitration process；The temperature of second preheating section 14 is 900 DEG C~1100 DEG C, and the flue-gas temperature of the second preheating section 14 outlet is
300 DEG C~380 DEG C, NOx concentration is 100mg/Nm in the flue gas in the second preheating section 143~400mg/Nm3, it is the master for generating NOx
Place is wanted, which mixes after denitration process, then with other sections of flue gas, and NOx concentration is low in mixed flue gas
In 50mg/Nm3, comply fully with discharged nitrous oxides concentration requirement.
Further, Benitration reactor 4 is SCR reactor.
Further, middle temperature catalyst layer is filled in Benitration reactor 4, middle temperature catalyst is such as, but not limited to conventional
Vanadium Ti-base catalyst, the ingredient of vanadium Ti-base catalyst are as follows: V2O5Account for 1%~5%, WO3Account for 5%~10%, TiO2It is big absolutely to account for remaining
Fraction.Middle temperature catalyst can be honeycomb middle temperature catalyst or board-like catalyst.By using cheap, technology at
Ripe middle temperature catalyst can further decrease the investment and operating cost of system.
Further, it is also connected with heat resisting exhauster 6 between reducing agent injection apparatus 5 and the exhanst gas outlet of the second preheating section 14,
Heat resisting exhauster 6 pumps the flue gas in the second preheating section 14 to Benitration reactor 4, and the height of flue gas can be born using heat resisting exhauster 6
Temperature.
Further, booster fan (not shown go out) can also be connected between heat resisting exhauster 6 and Benitration reactor 4, with
Overcome denitrating system resistance.But the utility model is not limited to this, and can also be not provided with booster fan, but to original resistance to hot wind
Machine 6 carries out boost in pressure transformation, can extract required exhaust gas volumn.
Further, down-draft drying zone 12 and the first preheating section 13 all have exhanst gas outlet, and the flue gas of down-draft drying zone 12 goes out
The exhanst gas outlet of mouth and the first preheating section 13 is connect with a main exhauster 7, and main exhauster 7 connects a chimney 8, down-draft drying zone
After flue gas in 12 is mixed with the flue gas after denitration, extracted out together with the flue gas in the first preheating section 13 by main exhauster 7, then lead to
The discharge of chimney 8 is crossed, NOx concentration is lower than 50mg/Nm in the flue gas that chimney 8 discharges3, meet discharged nitrous oxides concentration requirement.
Further, the desulfurizer for desulfurization is also connected between main exhauster 7 and chimney 8, desulfurizer is for example
For wet desulphurization device or semidry process desulfurizer.
In the embodiment shown in fig. 1, ring cold machine 3 has sequentially connected first cooling section 31, the second cooling section 32
With third cooling section 33, the first cooling section 31 is located at one end of 2 discharge port of close rotary kiln of ring cold machine 3, third cooling section 33
It is then successively the second cooling section 32 and third cooling section 33 positioned at one end of the separate rotary kiln 2 of ring cold machine 3, pelletizing is from returning
After the discharge port of rotary kiln 2 comes out, successively it is discharged after the first cooling section 31, the second cooling section 32 and third cooling section 33；
First cooling section 31 has exhanst gas outlet, and the first preheating section 13 has smoke inlet, the flue gas of the first cooling section 31
First pipe 101, the hot fume warp of the first cooling section 31 discharge are connected between outlet and the smoke inlet of the first preheating section 13
Entered in the first preheating section 13 by first pipe 101, for carrying out first order preheating to pelletizing；
Second cooling section 32 and third cooling section 33 all have exhanst gas outlet, and blasting drying period 11 has smoke inlet, the
It is connected between the exhanst gas outlet of two cooling sections 32 and the exhanst gas outlet of third cooling section 33 and the smoke inlet of blasting drying period 11
There is second pipe 102, the flue gas that the second cooling section 32 and third cooling section 33 are discharged enters forced air drying via second pipe 102
In section 11, for pelletizing to be dried.
In the present embodiment, by the way that ring cold machine 3 to be connect with drying grate 1, the hot fume of the discharge of ring cold machine 3 can be recycled,
Pelletizing is dried in drying grate 1, is preheated, energy loss is avoided；
In addition, the hot fume in rotary kiln 2 can also enter in drying grate 1, to ball in the second preheating section 14 of drying grate 1
Group carries out second level preheating.
Further, it is connected with air blower 9 on second pipe 102, be used for 33 row of the second cooling section 32 and third cooling section
Flue gas out blasts in blasting drying period 11.
Further, blasting drying period 11 has the exhanst gas outlet for discharging flue gas, and the flue gas NOx of blasting drying period 11 is dense
Degree is lower than 50mg/Nm3, this partial fume can be directly discharged into atmosphere by exhanst gas outlet.
It is the application example of the grate kiln denitrating system of the utility model below:
Example one: certain grate-kiln pelletizing process factory, the extraction of main exhauster 7 and the exhaust gas volumn discharged from chimney 8 are at full capacity
When be 120 ten thousand steres/hour, to connection the second preheating section 14 (high temperature preheating section) heat resisting exhauster 6 carry out boost in pressure change
It makes, increases pressure 1000Pa, air quantity is constant, and basis and the facilities such as platform are constant, and improved heat resisting exhauster 6 is from the second preheating section
14 extract about 50 ten thousand steres/hour flue gas, which is 350 DEG C, NOx concentration 400mg/Nm3, spray into gasification simultaneously
After diluted liquefied ammonia reducing agent, flue gas is sent into conventional Medium temperature SCR reactor and carries out denitration, the exiting flue gas temperature of Benitration reactor
Degree is 340 DEG C, NOx concentration 50mg/Nm3, the flue gas after denitration sends the down-draft drying zone 12 of drying grate 1 back to, then and other
Flue gas together, is sent to chimney 8 by the extraction of main exhauster 7 and discharges, and flue-gas temperature is 130 DEG C at discharge, NOx concentration 45mg/
Nm3, meet discharged nitrous oxides concentration requirement.
Example two: certain grate-kiln pelletizing process factory, the extraction of main exhauster 7 and the exhaust gas volumn discharged from chimney 8 are at full capacity
When be 75 ten thousand steres/hour, using connection booster fan heat resisting exhauster 6 from the second preheating section 14 extract 30 ten thousand steres/
The flue gas of hour, the flue-gas temperature are 330 DEG C, NOx concentration 300mg/Nm3, after spraying into gasification and diluted liquefied ammonia reducing agent,
Flue gas is sent into conventional Medium temperature SCR reactor and carries out denitration, the exit gas temperature of Benitration reactor is 320 DEG C, and NOx concentration is
40mg/Nm3, the flue gas after denitration sends the down-draft drying zone 12 of drying grate 1 back to, then and other flue gases together, by main exhauster 7
Extraction is sent to existing wet desulphurization equipment and carries out desulfurization, is then sent to the discharge of chimney 8, flue-gas temperature is 50 DEG C at discharge, and NOx is dense
Degree is 40mg/Nm3, meet discharged nitrous oxides concentration requirement.
The above descriptions are merely exemplary embodiments of the present utility model, the model being not intended to limit the utility model
It encloses.Any those skilled in the art, made equivalent variations under the premise of not departing from the conceptions and principles of the utility model
With modification, the range of the utility model protection should belong to.And it should be noted that each component part of the utility model simultaneously
It is not limited only to above-mentioned overall applicability, each technical characteristic described in the specification of the utility model can select according to actual needs
One individually uses or selects the multinomial use that combines, and therefore, the utility model covers in the nature of things to be invented with this case
The related other combinations of point and concrete application.
Claims (10)
1. a kind of grate kiln denitrating system, which is characterized in that the grate kiln denitrating system includes successively connecting
Drying grate, rotary kiln and the ring cold machine connect, the drying grate include sequentially connected blasting drying period, down-draft drying zone, first
Preheating section and the second preheating section, second preheating section are connect with the rotary kiln；
The grate kiln denitrating system further includes the Benitration reactor outside the drying grate, second preheating
Section has exhanst gas outlet, and the down-draft drying zone has smoke inlet, and the Benitration reactor is connected to second preheating section
Exhanst gas outlet and the down-draft drying zone smoke inlet between, the flue gas of the Benitration reactor and second preheating section
Reducing agent injection apparatus is also connected between outlet.
2. grate kiln denitrating system as described in claim 1, which is characterized in that the Benitration reactor and described the
Heat resisting exhauster is also connected between the exhanst gas outlet of two preheating sections.
3. grate kiln denitrating system as claimed in claim 2, which is characterized in that the heat resisting exhauster and the denitration
Booster fan is also connected between reactor.
4. grate kiln denitrating system as described in claim 1, which is characterized in that the down-draft drying zone and described
One preheating section all has exhanst gas outlet, the exhanst gas outlet of the exhanst gas outlet of the down-draft drying zone and first preheating section with
The connection of one main exhauster, the main exhauster connect a chimney.
5. grate kiln denitrating system as described in claim 1, which is characterized in that the Benitration reactor is that SCR is anti-
Answer device.
6. grate kiln denitrating system as claimed in claim 5, which is characterized in that be filled in the Benitration reactor
Middle temperature catalyst layer.
7. grate kiln denitrating system as claimed in claim 6, which is characterized in that the middle temperature catalyst layer is honeycomb
Shape catalyst or board-like catalyst.
8. grate kiln denitrating system as described in any one of claim 1 to 7, which is characterized in that the ring cold machine tool
There are sequentially connected first cooling section, the second cooling section and third cooling section, first cooling section is located at the ring cold machine
Close to one end of the discharge port of the rotary kiln；
First cooling section has exhanst gas outlet, and first preheating section has smoke inlet, the cigarette of first cooling section
First pipe is connected between gas outlet and the smoke inlet of first preheating section；
Second cooling section and the third cooling section all have exhanst gas outlet, and the blasting drying period has smoke inlet,
The smoke inlet of the exhanst gas outlet of the exhanst gas outlet of second cooling section and the third cooling section and the blasting drying period
Between be connected with second pipe.
9. grate kiln denitrating system as claimed in claim 8, which is characterized in that be connected with drum on the second pipe
Blower.
10. grate kiln denitrating system as described in any one of claim 1 to 7, which is characterized in that the forced air drying
Section has the exhanst gas outlet for discharging flue gas.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201820690462.4U CN208320483U (en) | 2018-05-10 | 2018-05-10 | A kind of grate kiln denitrating system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201820690462.4U CN208320483U (en) | 2018-05-10 | 2018-05-10 | A kind of grate kiln denitrating system |
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| CN208320483U true CN208320483U (en) | 2019-01-04 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108392984A (en) * | 2018-05-10 | 2018-08-14 | 中冶京诚工程技术有限公司 | A kind of grate kiln denitrating system and method for denitration |
| CN110180349A (en) * | 2019-07-05 | 2019-08-30 | 江苏盐环实业有限公司 | A kind of grate-kiln pelletizing flue gas minimum discharge system |
-
2018
- 2018-05-10 CN CN201820690462.4U patent/CN208320483U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108392984A (en) * | 2018-05-10 | 2018-08-14 | 中冶京诚工程技术有限公司 | A kind of grate kiln denitrating system and method for denitration |
| CN110180349A (en) * | 2019-07-05 | 2019-08-30 | 江苏盐环实业有限公司 | A kind of grate-kiln pelletizing flue gas minimum discharge system |
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