CN203829912U - Flue gas denitration system of CFB furnace - Google Patents
Flue gas denitration system of CFB furnace Download PDFInfo
- Publication number
- CN203829912U CN203829912U CN201420249706.7U CN201420249706U CN203829912U CN 203829912 U CN203829912 U CN 203829912U CN 201420249706 U CN201420249706 U CN 201420249706U CN 203829912 U CN203829912 U CN 203829912U
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- CN
- China
- Prior art keywords
- flue gas
- amino material
- air
- denitration system
- amino
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 48
- 239000003546 flue gas Substances 0.000 title claims abstract description 48
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 claims abstract description 78
- 239000000463 material Substances 0.000 claims abstract description 69
- 239000000446 fuel Substances 0.000 claims abstract description 53
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 7
- 239000006028 limestone Substances 0.000 claims description 14
- 235000019738 Limestone Nutrition 0.000 claims description 13
- 239000007787 solid Substances 0.000 claims description 10
- 238000005259 measurement Methods 0.000 claims description 9
- 239000000779 smoke Substances 0.000 claims description 6
- 230000008676 import Effects 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 3
- 239000003638 chemical reducing agent Substances 0.000 abstract description 16
- 238000001816 cooling Methods 0.000 abstract description 4
- 238000006243 chemical reaction Methods 0.000 abstract description 3
- 239000003245 coal Substances 0.000 abstract description 3
- 238000002485 combustion reaction Methods 0.000 abstract description 3
- 239000002737 fuel gas Substances 0.000 abstract 2
- 230000002035 prolonged effect Effects 0.000 abstract 1
- 230000000630 rising effect Effects 0.000 abstract 1
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 33
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 14
- 239000007921 spray Substances 0.000 description 8
- 229910021529 ammonia Inorganic materials 0.000 description 7
- 238000000034 method Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 4
- 241000273930 Brevoortia tyrannus Species 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- 238000006722 reduction reaction Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- ATRRKUHOCOJYRX-UHFFFAOYSA-N Ammonium bicarbonate Chemical compound [NH4+].OC([O-])=O ATRRKUHOCOJYRX-UHFFFAOYSA-N 0.000 description 1
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 1
- 239000001099 ammonium carbonate Substances 0.000 description 1
- 235000012501 ammonium carbonate Nutrition 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000004202 carbamide Substances 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
Landscapes
- Chimneys And Flues (AREA)
Abstract
The utility model discloses a flue gas denitration system of a CFB furnace. The flue gas denitration system comprises an amino material storage device arranged outside a hearth, a metering and feeding device connected with the amino material storage device, and an amino material ejector connected with the metering and feeding device through an amino material pneumatic conveying pipeline, wherein the amino material ejector is arranged in a fuel conveying pipeline outside the hearth. According to the flue gas denitration system of the CFB furnace, the amino material ejector is arranged on the fuel conveying pipeline, so that a reducing agent can be added into the furnace together with the fuel, thus the reducing agent is capable of being mixed with the fuel gas formed by combustion of coal in the hearth at any time and participating in reaction, and the fuel gas does not need to react with the reducing agent after rising to a certain position in the hearth; namely, the stay time of the reducing agent is prolonged, and the utilization rate of the amino material is higher; moreover, the problem that a screen is blasted when the reducing agent ejected by the hearth is ejected to a water cooling wall tube can be avoided.
Description
Technical field
The utility model relates to a kind of flue gas denitrification system, is specifically related to a kind of flue gas denitrification system of CFB boiler, belongs to denitration of boiler smoke technical field.
Background technology
Along with expanding economy, nitrogen oxide (NO
x) discharge capacity of pollutant increases sharply, severe contamination ecological environment, become one of key factor of restriction economic development, wherein coal-burning boiler is concentrated, is easily controlled compared with other spread sources greatly and relatively because of its discharge capacity, becomes and controls nitrogen oxide (NO
x) preferred object.
At present, denitrating flue gas nitrogen oxide (NOx), can be divided into wet method NO_x removal and dry removal NOx according to administering technique, wherein conventional dry removal NOx is also divided into selective catalytic reduction (SCR) and SNCR method (SNCR).CFBB (CFB) technology is the high-efficiency low-pollution clean burning branch art developing rapidly in recent ten years.This technology has obtained business application widely in the field such as station boiler, Industrial Boiler in the world, for CFB boiler, because temperature field is stable, original NOx concentration is low, and SNCR technology (SNCR) is processed NOx in its flue gas and is widely used.
Chinese patent literature CN103638805A discloses a kind of CFB boiler SNCR denitration method for flue gas of dual reducting agents, comprise, when cyclone inlet flue gas temperature is more than 850 DEG C, or, CFB boiler load is in the time that 70%BMCR is above, select to spray into conventional ammonia reducing agent from cyclone inlet flue, when cyclone inlet flue gas temperature is lower than 850 DEG C, or, CFB boiler load is during lower than 70%BMCR, select from upper furnace, a place or many places in cyclone inlet flue and separator outlet flue spray into the reducing agent can produce active ammonia component.While adopting above-mentioned spray regime injection reduction agent, make its fire resistance rating to injector have relatively high expectations because fire box temperature is high, thereby injection apparatus cost is improved, in addition, because the inner space of burner hearth is limited, after spray when liquid reducing agent, may causing the boiler interior conduit contact liquid droplets such as water-cooling wall after reducing agent sprays into, easily cause corrosion, even produce explosion.
Utility model content
For solving in prior art in the time that upper furnace, cyclone inlet flue or separator outlet flue spray into liquid reducing agent, easily cause the problem of the boiler interior conduit corrosion such as water-cooling wall or explosion, and then a kind of CFB boiler flue gas denitration system is provided.
For this reason, the scheme that the utility model is taked is,
A kind of CFB boiler flue gas denitration system, comprise, be arranged at the measurement charging device that the amino material storage device outside burner hearth is connected with described amino material storage device, and the amino material injector being connected with described measurement charging device by amino material Pneumatic conveying pipeline, wherein, described amino material injector is arranged in the fuel tube of described burner hearth outside.
In above-mentioned CFB boiler flue gas denitration system, one end of described fuel tube is connected with the fuel inlet of described burner hearth bottom, its other end is connected with Bunker, is arranged at described amino material injector in described fuel tube near described fuel inlet.
In above-mentioned CFB boiler flue gas denitration system, the described fuel inlet 500-3000mm of described amino material injector distance.
In above-mentioned CFB boiler flue gas denitration system, described amino material injector is obliquely installed towards fuel flow direction, and has angle with the axial shape of described fuel tube, and described angle is 15-30 degree.
In above-mentioned CFB boiler flue gas denitration system, described amino material injector is the amino surge device of solid, it comprises the amino matter inlet of the solid being connected with described amino material Pneumatic conveying pipeline, with described solid amino the matter inlet trunnion being connected and the anemostat being connected with described trunnion, be also included as amino material and carry the compressed-air atomizer that strength is provided.
In above-mentioned CFB boiler flue gas denitration system, described amino material injector is connected by flange with described fuel tube through the sealed air device that prevents fuel and leak outside.
In above-mentioned CFB boiler flue gas denitration system, be provided with multiple described amino material injectors in fuel tube, multiple described amino material injectors are arranged on the sidewall of described fuel tube along the axially parallel of described fuel tube.
In above-mentioned CFB boiler flue gas denitration system, lime stone conveyance conduit, one end of described lime stone conveyance conduit is connected with the lime stone import of burner hearth bottom, and its other end is connected with lime stone storehouse;
The cyclone separator being connected with described upper furnace, described cyclone separator is delivered to boiler tail device by the flue gas after separating by separator outlet pipeline, and described cyclone separator is transported to the fuel particle after separating in described burner hearth and rekindles via the returning charge pipeline being connected with its underpart.
In above-mentioned CFB boiler flue gas denitration system, along the flow direction of boiler smoke, described boiler tail device comprises superheater, reheater, economizer and air preheater successively.
In above-mentioned CFB boiler flue gas denitration system, also comprise air-supply arrangement, described air-supply arrangement comprises air-supply arrangement and secondary blast device, a described air-supply arrangement comprises primary air fan, the first air channels and the second air channels, the one end in described the first air channels is connected with primary air fan, its other end is connected with described air preheater, and described the second one end, air channel are connected with described air preheater, and its other end is connected with the water cooled wind chamber that is arranged at burner hearth bottom; Described secondary blast device comprises overfire air fan, the first secondary air duct and the second secondary air duct, one end of described the first secondary air duct is connected with overfire air fan, its other end is connected with described air preheater, described second secondary air duct one end is connected with described air preheater, and its other end is connected with described burner hearth.
Compared with prior art, the utlity model has following advantage,
1, the flue gas denitrification system of the application CFB boiler, because amino material injector is arranged on fuel tube, make reducing agent and fuel together enter boiler, reducing agent can mix at any time and participate in reaction in burner hearth with the Gas phase Smoke of coal combustion formation like this, instead of flue gas rises to certain position and react with reducing agent in burner hearth, be equivalent to the reducing agent time of staying extend; Adopt in addition the application's mode that more even that injector makes that reducing agent mixes with flue gas is set, amino material utilization is higher, and nitrogen oxidation oxygen removal rate is larger; And reducing agent sprays into and is a little located at convey coal pipe place, stop the agent of burner hearth injection reduction and be sprayed onto water screen tube and cause the problem of sudden and violent screen.
2, the flue gas denitrification system of the application CFB boiler, because amino material injector is arranged on fuel tube, thereby reduce the heatproof requirement to injector material, do not need high temperature resistant material, thereby reduce capital expenditure, and cooling air or the cooling water of injector can be set in system, so just simplify system flow, reduced system gross investment and reduced operating cost.
3, the flue gas denitrification system of the application CFB boiler, compared with traditional CFB boiler SNCR, amino material enters burner hearth with solid form with fuel, has saved amino substance dissolves and solution storing step, there is no water consumption, saves the energy.
Brief description of the drawings
For content of the present utility model is more likely to be clearly understood, according to specific embodiment of the utility model also by reference to the accompanying drawings, the utility model is described in further detail, wherein below
Fig. 1 is a kind of CFB boiler flue gas denitration system.
Wherein, Reference numeral is expressed as,
The amino material storage device of 1-; 2 – measurement charging devices; The amino material Pneumatic conveying pipeline of 3-; 4 – water cooled wind chambers; The amino material injector of 5-; 7 – lime stone storehouses; 8 – Bunkers; 9-burner hearth; 11-cyclone separator; 12-superheater; 13-reheater; 14-economizer; 15-air preheater; 16-overfire air fan; 17-primary air fan; 18-fuel tube; 19-lime stone conveyance conduit, 20-fuel inlet.
Detailed description of the invention
A kind of CFB boiler flue gas denitration system as shown in Figure 1, comprise, be arranged at the measurement charging device 2 that the amino material storage device 1 outside burner hearth 9 is connected with described amino material storage device 1, and the amino material injector 5 being connected with described measurement charging device 2 by amino material Pneumatic conveying pipeline 3, it is characterized in that, described amino material injector 5 is arranged in the fuel tube 18 of described burner hearth 9 outsides.
On the basis of above-mentioned embodiment, one end of described fuel tube 18 is connected with the fuel inlet 20 of described burner hearth 9 bottoms, its other end is connected with Bunker 8, is arranged at described amino material injector 5 in described fuel tube 18 near described fuel inlet 20.Preferably, the described fuel inlet 20 of described amino material injector 5 distance is 500-3000mm.
On the basis of above-mentioned embodiment, described amino material injector (5) is obliquely installed towards fuel flow direction, and has angle with the axial shape of described fuel tube (18), and described angle is 15-30 degree.
On the basis of above-mentioned embodiment, described amino material injector 5 is the amino surge device of solid, it comprises the amino matter inlet of the solid being connected with described amino material Pneumatic conveying pipeline 3, with described solid amino the matter inlet trunnion being connected and the anemostat being connected with described trunnion, be also included as amino material and carry the compressed-air atomizer that strength is provided.
On the basis of above-mentioned embodiment, described amino material injector 5 is connected by flange with described fuel tube 18 through the sealed air device that prevents fuel and leak outside.
On the basis of above-mentioned embodiment, in fuel tube 18, be provided with multiple described amino material injectors 5, multiple described amino material injectors 5 are arranged on the sidewall of described fuel tube 18 along the axially parallel of described fuel tube 18.
On the basis of above-mentioned embodiment, also comprise lime stone conveyance conduit 19, one end of described lime stone conveyance conduit 19 is connected with the lime stone import of burner hearth 9 bottoms, and its other end is connected with lime stone storehouse 7;
The cyclone separator 11 being connected with described burner hearth 9 tops, described cyclone separator 1 is delivered to boiler tail device by the flue gas after separating by separator outlet pipeline, and described cyclone separator 1 is transported to the fuel particle after separating in described burner hearth and rekindles via the returning charge pipeline being connected with its underpart.
On the basis of above-mentioned embodiment, along the flow direction of boiler smoke, described boiler tail device comprises superheater 12, reheater 13, economizer 14 and air preheater 15 successively.
On the basis of above-mentioned embodiment, also comprise air-supply arrangement, described air-supply arrangement comprises air-supply arrangement and secondary blast device, a described air-supply arrangement comprises primary air fan 17, the first air channels and the second air channels, the one end in described the first air channels is connected with primary air fan, its other end is connected with described air preheater 15, described the second one end, air channel are connected with described air preheater 15, and its other end is connected with the water cooled wind chamber 4 that is arranged at burner hearth bottom; Described secondary blast device comprises overfire air fan 16, the first secondary air duct and the second secondary air duct, one end of described the first secondary air duct is connected with overfire air fan, its other end is connected with described air preheater 15, described second secondary air duct one end is connected with described air preheater 15, and its other end is connected with described burner hearth 9.
The out of stock system of above-mentioned CFB boiler smoke is carried out the out of stock technique basic step of flue gas and is comprised, amino material storage device 1 is delivered to amino material the measurement charging device 2 of amino material by pipeline, the ammonia requirement being needed according to SNCR by amino material measurement charging device 2 is converted to amino material and the flow needing is provided, by the connection of amino material Pneumatic conveying pipeline 3, amino material is delivered to amino material injector group 5 and spray.
The amino material of ejection enters boiler furnace with fuel, amino material generates ammonia and carbon dioxide in the interior decomposes of CFB boiler furnace 9 and with airborne steam reaction, fuel forms flue gas at stove chamber inner combustion, this flue gas fully mixes in burner hearth with ammonia, because being no more than ammonia, CFB boiler hearth temperature maximum is oxidized to the temperature of NOx, so the ammonia of amino substance decomposition can be in the temperature range of 850-1200 DEG C optionally with flue gas in NOx react, generate N2 and H
2o and remove the nitrogen oxide in flue gas, reaches discharge standard discharge through flue subsequently; The amino material spraying in above-mentioned technical process can be urea, carbonic hydroammonium or ammonium carbonate.
Obviously, above-described embodiment is only for example is clearly described, and the not restriction to embodiment.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here without also giving exhaustive to all embodiments.And the apparent variation of being extended out thus or variation are still among protection domain of the present utility model.
Claims (10)
1. a CFB boiler flue gas denitration system, comprise, be arranged at the measurement charging device (2) that the outer amino material storage device (1) of burner hearth (9) is connected with described amino material storage device (1), and the amino material injector (5) being connected with described measurement charging device (2) by amino material Pneumatic conveying pipeline (3), it is characterized in that, described amino material injector (5) is arranged in the outside fuel tube (18) of described burner hearth (9).
2. CFB boiler flue gas denitration system according to claim 1, it is characterized in that, one end of described fuel tube (18) is connected with the fuel inlet (20) of described burner hearth (9) bottom, its other end is connected with Bunker (8), is arranged at the close described fuel inlet (20) of described amino material injector (5) in described fuel tube (18).
3. CFB boiler flue gas denitration system according to claim 2, is characterized in that, described amino material injector (5) the described fuel inlet of distance (20) is 500-3000mm.
4. according to the arbitrary described CFB boiler flue gas denitration system of claim 1-3, it is characterized in that, described amino material injector (5) is obliquely installed towards fuel flow direction, and have angle with the axial shape of described fuel tube (18), described angle is 15-30 degree.
5. CFB boiler flue gas denitration system according to claim 4, it is characterized in that, described amino material injector (5) is the amino surge device of solid, it comprises the amino matter inlet of the solid being connected with described amino material Pneumatic conveying pipeline (3), with described solid amino the matter inlet trunnion being connected and the anemostat being connected with described trunnion, be also included as amino material and carry the compressed-air atomizer that strength is provided.
6. CFB boiler flue gas denitration system according to claim 5, is characterized in that, described amino material injector (5) is connected by flange with described fuel tube (18) through the sealed air device that prevents fuel and leak outside.
7. according to the CFB boiler flue gas denitration system described in claim 5 or 6, it is characterized in that, in fuel tube (18), be provided with multiple described amino material injectors (5), multiple described amino material injectors (5) are arranged on the sidewall of described fuel tube (18) along the axially parallel of described fuel tube (18).
8. CFB boiler flue gas denitration system according to claim 7, is characterized in that, also comprise,
Lime stone conveyance conduit (19), one end of described lime stone conveyance conduit (19) is connected with the lime stone import of burner hearth (9) bottom, and its other end is connected with lime stone storehouse (7);
The cyclone separator (11) being connected with described burner hearth (9) top, described cyclone separator (1) is delivered to boiler tail device by the flue gas after separating by separator outlet pipeline, and described cyclone separator (1) is transported to the fuel particle after separating in described burner hearth and rekindles via the returning charge pipeline being connected with its underpart.
9. CFB boiler flue gas denitration system according to claim 8, is characterized in that,
Along the flow direction of boiler smoke, described boiler tail device comprises superheater (12), reheater (13), economizer (14) and air preheater (15) successively.
10. CFB boiler flue gas denitration system according to claim 9, it is characterized in that, also comprise air-supply arrangement, described air-supply arrangement comprises air-supply arrangement and secondary blast device, a described air-supply arrangement comprises primary air fan (17), the first air channels and the second air channels, the one end in described the first air channels is connected with primary air fan, its other end is connected with described air preheater (15), described the second one end, air channel are connected with described air preheater (15), its other end is connected with the water cooled wind chamber (4) that is arranged at burner hearth bottom, described secondary blast device comprises overfire air fan (16), the first secondary air duct and the second secondary air duct, one end of described the first secondary air duct is connected with overfire air fan, its other end is connected with described air preheater (15), described second secondary air duct one end is connected with described air preheater (15), and its other end is connected with described burner hearth (9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420249706.7U CN203829912U (en) | 2014-05-15 | 2014-05-15 | Flue gas denitration system of CFB furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420249706.7U CN203829912U (en) | 2014-05-15 | 2014-05-15 | Flue gas denitration system of CFB furnace |
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| Publication Number | Publication Date |
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| CN203829912U true CN203829912U (en) | 2014-09-17 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105498521A (en) * | 2016-01-13 | 2016-04-20 | 杭州锅炉集团股份有限公司 | SNCR denitrification device capable of directly feeding urea granules for CFB boiler |
| CN107477573A (en) * | 2017-09-21 | 2017-12-15 | 哈尔滨工业大学 | A kind of heart in the burner for industrial coal powder boiler sprays the burner of ammonia |
| CN113880468A (en) * | 2020-07-01 | 2022-01-04 | 中国科学院工程热物理研究所 | Multistage suspension preheater, control method and control method of cement clinker generation equipment |
-
2014
- 2014-05-15 CN CN201420249706.7U patent/CN203829912U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105498521A (en) * | 2016-01-13 | 2016-04-20 | 杭州锅炉集团股份有限公司 | SNCR denitrification device capable of directly feeding urea granules for CFB boiler |
| CN107477573A (en) * | 2017-09-21 | 2017-12-15 | 哈尔滨工业大学 | A kind of heart in the burner for industrial coal powder boiler sprays the burner of ammonia |
| CN107477573B (en) * | 2017-09-21 | 2019-04-16 | 哈尔滨工业大学 | A kind of burner of the spray ammonia of the heart in the burner for industrial coal powder boiler |
| CN113880468A (en) * | 2020-07-01 | 2022-01-04 | 中国科学院工程热物理研究所 | Multistage suspension preheater, control method and control method of cement clinker generation equipment |
| CN113880468B (en) * | 2020-07-01 | 2023-07-21 | 中国科学院工程热物理研究所 | Multistage suspension preheater, control method thereof and cement clinker generation equipment control method |
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| C14 | Grant of patent or utility model | ||
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Granted publication date: 20140917 |
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