CN111514739A - Novel composite biomass denitration powder for dry-process cement kiln, use method of composite biomass denitration powder and denitration system - Google Patents
Novel composite biomass denitration powder for dry-process cement kiln, use method of composite biomass denitration powder and denitration system Download PDFInfo
- Publication number
- CN111514739A CN111514739A CN201910107957.9A CN201910107957A CN111514739A CN 111514739 A CN111514739 A CN 111514739A CN 201910107957 A CN201910107957 A CN 201910107957A CN 111514739 A CN111514739 A CN 111514739A
- Authority
- CN
- China
- Prior art keywords
- powder
- denitration
- biomass
- decomposing furnace
- cement kiln
- 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.)
- Pending
Links
- 239000002028 Biomass Substances 0.000 title claims abstract description 118
- 239000000843 powder Substances 0.000 title claims abstract description 112
- 239000004568 cement Substances 0.000 title claims abstract description 52
- 238000000034 method Methods 0.000 title claims abstract description 33
- 238000001035 drying Methods 0.000 title claims description 8
- 239000002131 composite material Substances 0.000 title abstract description 8
- 238000005507 spraying Methods 0.000 claims abstract description 33
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 44
- 239000000463 material Substances 0.000 claims description 21
- 239000003245 coal Substances 0.000 claims description 20
- 229910052799 carbon Inorganic materials 0.000 claims description 18
- 229910002804 graphite Inorganic materials 0.000 claims description 13
- 239000010439 graphite Substances 0.000 claims description 13
- 239000002023 wood Substances 0.000 claims description 9
- 229940098458 powder spray Drugs 0.000 claims description 8
- 239000010902 straw Substances 0.000 claims description 8
- 239000002699 waste material Substances 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 claims description 6
- 238000012545 processing Methods 0.000 claims description 6
- 239000000126 substance Substances 0.000 claims description 6
- 230000001174 ascending effect Effects 0.000 claims description 5
- 239000006227 byproduct Substances 0.000 claims description 5
- 238000003860 storage Methods 0.000 claims description 5
- 241000196324 Embryophyta Species 0.000 claims description 4
- 240000007594 Oryza sativa Species 0.000 claims description 4
- 235000007164 Oryza sativa Nutrition 0.000 claims description 4
- 238000010000 carbonizing Methods 0.000 claims description 4
- -1 corncobs Substances 0.000 claims description 4
- 235000009566 rice Nutrition 0.000 claims description 4
- 238000012994 industrial processing Methods 0.000 claims description 3
- 239000010815 organic waste Substances 0.000 claims description 3
- 241000609240 Ambelania acida Species 0.000 claims description 2
- 244000025254 Cannabis sativa Species 0.000 claims description 2
- 239000010905 bagasse Substances 0.000 claims description 2
- 235000013399 edible fruits Nutrition 0.000 claims description 2
- 239000007787 solid Substances 0.000 claims description 2
- 239000002916 wood waste Substances 0.000 claims description 2
- 244000005700 microbiome Species 0.000 claims 1
- 239000003546 flue gas Substances 0.000 abstract description 36
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 abstract description 35
- 239000003795 chemical substances by application Substances 0.000 abstract description 24
- 230000007613 environmental effect Effects 0.000 abstract description 6
- 230000009467 reduction Effects 0.000 abstract description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 56
- 238000005516 engineering process Methods 0.000 description 18
- 238000004519 manufacturing process Methods 0.000 description 14
- 230000000694 effects Effects 0.000 description 12
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 10
- 239000000428 dust Substances 0.000 description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 10
- 238000006243 chemical reaction Methods 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 9
- 239000007789 gas Substances 0.000 description 9
- 230000008569 process Effects 0.000 description 8
- 239000002994 raw material Substances 0.000 description 7
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 6
- 235000011114 ammonium hydroxide Nutrition 0.000 description 6
- 238000012544 monitoring process Methods 0.000 description 6
- 239000007921 spray Substances 0.000 description 6
- 229910021529 ammonia Inorganic materials 0.000 description 4
- 238000003763 carbonization Methods 0.000 description 4
- 239000003610 charcoal Substances 0.000 description 4
- 239000003638 chemical reducing agent Substances 0.000 description 4
- 150000002430 hydrocarbons Chemical class 0.000 description 4
- 238000011160 research Methods 0.000 description 4
- 239000000779 smoke Substances 0.000 description 4
- 239000012265 solid product Substances 0.000 description 4
- 240000008042 Zea mays Species 0.000 description 3
- 235000005824 Zea mays ssp. parviglumis Nutrition 0.000 description 3
- 235000002017 Zea mays subsp mays Nutrition 0.000 description 3
- 239000003054 catalyst Substances 0.000 description 3
- 238000010531 catalytic reduction reaction Methods 0.000 description 3
- 235000005822 corn Nutrition 0.000 description 3
- 239000003344 environmental pollutant Substances 0.000 description 3
- 229910052739 hydrogen Inorganic materials 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 231100000719 pollutant Toxicity 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 239000004202 carbamide Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 229930195733 hydrocarbon Natural products 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 238000006722 reduction reaction Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 244000261422 Lysimachia clethroides Species 0.000 description 1
- 244000046052 Phaseolus vulgaris Species 0.000 description 1
- 235000010627 Phaseolus vulgaris Nutrition 0.000 description 1
- 240000000111 Saccharum officinarum Species 0.000 description 1
- 235000007201 Saccharum officinarum Nutrition 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 238000003916 acid precipitation Methods 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000012159 carrier gas Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000003337 fertilizer Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- XLYOFNOQVPJJNP-ZSJDYOACSA-N heavy water Substances [2H]O[2H] XLYOFNOQVPJJNP-ZSJDYOACSA-N 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 235000012054 meals Nutrition 0.000 description 1
- 230000000813 microbial effect Effects 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- JTJMJGYZQZDUJJ-UHFFFAOYSA-N phencyclidine Chemical class C1CCCCN1C1(C=2C=CC=CC=2)CCCCC1 JTJMJGYZQZDUJJ-UHFFFAOYSA-N 0.000 description 1
- 231100000572 poisoning Toxicity 0.000 description 1
- 230000000607 poisoning effect Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 239000011802 pulverized particle Substances 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 238000004227 thermal cracking Methods 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/54—Nitrogen compounds
- B01D53/56—Nitrogen oxides
- B01D53/565—Nitrogen oxides by treating the gases with solids
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
- Y02C20/00—Capture or disposal of greenhouse gases
- Y02C20/10—Capture or disposal of greenhouse gases of nitrous oxide (N2O)
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Environmental & Geological Engineering (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention relates to composite biomass denitration powder for a cement kiln, a using method thereof and a denitration system. The invention utilizes the atmosphere characteristics of the decomposing furnace, realizes economic, efficient and environment-friendly flue gas denitration by spraying the biomass denitration powder in the most suitable atmosphere and position, has the characteristics of less equipment investment, simple and convenient use, green and renewable denitration agent and the like, can powerfully promote the emission reduction and environmental protection of NOx in the cement industry, and has important environmental, social and economic significance.
Description
Technical Field
The invention belongs to the field of flue gas denitration in cement industry, and particularly relates to a novel biomass denitration powder for a dry-method cement kiln, a use method of the novel biomass denitration powder and a denitration system.
Background
With the expansion of the production scale of cement in China, the discharge amount of nitrogen oxides (NOx) in the cement industry becomes the third largest pollution source second to thermal power generation and automobile exhaust, and the increasingly fragile ecological environment is seriously influenced. In addition, in recent years, smoke denitration in the cement industry is urgent in large and medium-sized cities across the country due to natural disasters such as haze and acid rain. In 2013, the environmental protection department of 12 months and the national quality supervision, inspection and quarantine bureau jointly release the discharge standard of pollutants in atmosphere in cement industry
GB4915-2013 replaces original standard GB4915-2004, and existing and newly-built cement plant NOx (according to NO)2Meter) emission concentration not exceeding 400mg/m3The critical area implementation special emission limit is 150mg/m3。
Currently, the most widely used flue gas denitration technology in the cement industry is the selective non-catalytic reduction NOx technology (SNCR). The SNCR method may use ammonia, ammonia gas, or urea as a reducing agent. The denitration efficiency of the technology is low (generally<60%), which results in higher flue gas denitration costs for cement enterprises and also fails to meet increasingly stringent NOx emission standards (NOx emission concentration cannot be reduced to 150mg/m 3). Titanium-based vanadium-based catalyst (V) is commonly used in Selective Catalytic Reduction (SCR) technology2O5-WO3/TiO2). The SCR method may also use ammonia, ammonia gas, or urea as a reducing agent. The SCR method has a high active temperature window (320-420 ℃), and an SCR device needs to be arranged in front of a kiln tail dust collector. However, there is dust and SO in the flue gas2The concentration is high, which easily causes catalyst poisoning and reduces the service life of the catalyst. The ammonia water use efficiency in SCR and SNCR denitration technologies is 60-80%, when the temperature is too high, ammonia and oxygen react to generate NOx, and when the temperature is too low, the reduction rate of the NOx is too low, and ammonia in flue gas escapes seriously. In addition, the ammonia water is also a high-energy-consumption and high-pollution product, and ammonia water is used for removingNitrate only transfers pollution from the cement industry to the fertilizer industry, and the technology does not have any significance for emission reduction at the national level. Therefore, the development of a low-cost and high-efficiency flue gas denitration technology suitable for the cement industry is urgently needed.
In addition, the prior technical specification GB 51045-. Based on the particularity of the denitration reaction principle of the denitration technology, the source of target pollutants, the denitration reaction conditions (such as the denitration reaction temperature), the reaction environment, the selection of the denitration agent and the like, the skilled person in the field generally considers that the denitration technology is obviously different from other environmental protection technologies such as the desulfurization technology and the like, and then the technology in other fields cannot be directly used for solving the problems in the denitration technology.
Generally, the denitration process in the prior art has low efficiency and poor denitration effect, and the denitration agent has the problems of high cost and serious pollution; moreover, the technical field is easy to limit when a person skilled in the art develops the denitration technology, so that a satisfactory economical, environment-friendly and efficient denitration technology for the dry-process cement kiln still does not appear at present.
On the other hand, biomass resources on earth are very large in quantity and can be continuously regenerated, and the main component element C, H, O is also the three elements which are most frequently converted or used in modern chemical industry. Biomass resources play a more important role in the human resource structure, if they can be efficiently converted into starting materials that can be utilized by the chemical industry. Therefore, the preparation of various chemicals from biomass has become an important means for the efficient utilization of biomass resources, and the development of biomass chemical technology is taken as an important strategic deployment and a great deal of manpower and material resources are invested in research and development in all countries in the world. From the redox point of view of reaction, C, H element contained in biomass has reducibility, and how to apply the C, H element in the cement industry as a nitrogen oxide reducing agent to replace the currently used high-energy reducing agent ammonia water is an important research target with wide prospect and great economic and social benefits.
However, the applicant found that by carefully selecting the kind and the addition position of the denitration agent, the efficiency of the denitration process can be significantly improved, the denitration effect can be improved, and the denitration cost can be reduced.
Disclosure of Invention
In order to reduce the emission of NOx in the flue gas of a cement kiln (particularly a novel dry-process cement kiln), the applicant of the invention provides biomass denitration powder for the cement kiln, a use method thereof and a denitration system thereof according to the characteristics of a cement production process (particularly the characteristics of a decomposing furnace structure and atmosphere). Particularly, this application is through spouting adding living beings denitration powder in the most suitable atmosphere and position, realizes the flue gas denitration of economy, high efficiency, environmental protection.
The novel dry cement production method is a modern cement production method taking suspension preheating and kiln outside decomposition technologies as the core, and is a cement production method generally adopted in China. The apparatus used in the new dry cement production process typically includes at least rotary kiln, decomposing furnace and cyclone.
In one aspect, the invention adopts the technical scheme that: and (3) spraying biomass denitration powder at a position (preferably, the part from the outlet of the decomposing furnace to the upgoing part of the connection air pipe of the lowest-stage cyclone cylinder, and more preferably, the outlet part of the decomposing furnace) (position 2) between the inlets of the rear section and the lowest-stage cyclone cylinder (the five-stage preheater is a C5 cyclone cylinder, the six-stage preheater is a C6 cyclone cylinder, and the like).
It is believed that at the location, the biomass in the biomass denitration powder reacts with water to form a product containing CO, CH4、H2And hydrocarbon compounds such as HCN. The mixture can rapidly and efficiently reduce most of NOx into N2。
The spraying in this application refers independently at each occurrence thereof to the addition of the denitrifier to the desired location by pressure in the presence or absence of a carrier (e.g., water or a carrier gas such as air). Other means known to those skilled in the art may also be used to add the denitrifier to the desired location, as long as the other means can add the denitrifier to the desired location. In the present application, "add on", "drop on", "inject on" and "add on" may be used interchangeably.
According to the denitration method and device, the spraying position, especially the denitration water agent and the spraying position are combined, so that the efficiency of the denitration process can be obviously improved, the denitration effect is improved, and the denitration cost is reduced. The applicant has found that by using a water agent for denitration of biomass at the location, an excellent denitration effect can be obtained, and the denitration efficiency achieved is significantly higher than in the prior art.
In addition, the invention also relates to a biomass denitration system for the cement kiln, which comprises biomass denitration powder and a powder spraying device, wherein the biomass denitration powder is as described herein; the powder spraying device comprises a powder storage bin, a fan and a powder spray gun, wherein the powder spray gun is arranged between the rear section of the decomposing furnace and the inlet of the lowest stage of cyclone.
In a preferred embodiment, the powder spraying device comprises a metering feeder, a pneumatic conveying pump, a roots blower, a powder pipeline, a compressed air pipeline and a valve in addition to the powder storage bin, the blower and the powder spray gun.
The reactions that may be involved in the denitration process are as follows:
(1) the biomass denitration water agent is decomposed or reacts with carbon to release hydrocarbon:
2C+O2→2CO
C+H2O→CO+H2
CxHyOz→(x-z)C+z CO+y/2H2
(2) hydrocarbons reduce NOx to nitrogen:
2NOx+(x+1)H2→2NH+x H2O
NH+NH→N2+H2
2H2+2NO→N2+2H2O
2NOx+x C→N2+x CO2
2NOx+2x C→N2+2x CO
2NOx+2x CO→N2+2x CO2
the reaction principle of the denitration process is complex, various reaction processes are staggered, and the reaction generated under different conditions and environments can change at any time, so that it is not easy to obtain the denitration agent which can obtain excellent denitration effect under various working conditions.
Through years of theoretical and practical research, the technical scheme of the biomass denitration powder is innovatively provided. The biomass denitration powder comprises: 50-90 wt% of coal gangue powder; 10-40 wt% of graphite ore powder; and 5-30 wt% of biomass carbon powder. In one embodiment, the gangue powder comprises 50, 55, 60, 65, 70, 75, 80, 85, 90% by weight of the biomass denitration powder. In one embodiment, the graphite ore powder comprises 10, 15, 20, 25, 30, 35, 40% by weight of the biomass denitration dust. In one embodiment, the biomass charcoal powder comprises 5, 8, 10, 12, 15, 18, 20, 25, 28, 30 wt% of the biomass denitration dust. In a preferred technical scheme, the biomass denitration powder is prepared from 50-90 wt% of coal gangue powder; 10-40 wt% of graphite ore powder; and 5-30 wt% of biomass carbon powder, wherein the sum of the components is 100%.
The biomass denitration powder is prepared by drying, processing, uniformly mixing and the like by using various raw materials according to the expected amount.
In the biomass denitration powder, the coal gangue refers to solid waste discharged in a coal mining process and a coal washing process, and is a black and gray rock which has lower carbon content and is harder than coal and is associated with a coal bed in a coal forming process. The gangue powder in this patent may be one sold in the market or obtained in other known ways. In one embodiment, the coal gangue powder used in the present application is produced in Wuping county, Fujian province, and ground to a fineness of 200 mesh with a carbon content of about 25%. The coal gangue powder in the scheme only needs to be coal gangue powder with common mass, and has no over-high requirement on indexes such as carbon content and the like.
The graphite ore powder used in the biomass denitration powder is commercially available graphite ore powder or graphite ore powder obtained by other known methods, and is obtained by crushing and grinding graphite ore. In one embodiment, the graphite ore powder used in the present application is produced in Chenzhou city, Hunan province, and ground to a fineness of 200 mesh with a carbon content of about 70%. It is clear to those skilled in the art that other suitable fineness or particle size, as well as other carbon content graphite ore fines, are also suitable for use in the denitration powder of this patent.
The biomass carbon powder used in the biomass denitration powder is ground powder of biomass carbon. The biomass charcoal is a charcoal-containing solid substance obtained by carbonizing a biomass material under an anoxic and heating condition (preferably 400-800 ℃). The biomass material comprises any non-petrochemical plant material, animal material or microbial material (preferably plant material), wherein the biomass material used for preparing the biomass denitration powder and the biomass material used for preparing the biomass denitration aqueous solution are optionally the same or different. The biomass material comprises agriculture and forestry byproducts and/or industrial processing organic waste; preferably, wherein the agroforestry byproduct preferably comprises: branches, leaves, bark, wood, grass, corncobs, straw, rice hulls, fruit shells, shrubs, and vines, wherein the industrial organic processing waste comprises: bagasse, wood waste (such as wood chips, wood processing waste, and woodlands), and straw waste. Specifically, the biomass carbon powder used in the test of the invention is a carbon-containing solid product obtained by heating and carbonizing straw and rice hull under an anoxic condition, and is ground to 200 meshes of fineness. It is clear to those skilled in the art that other suitable biomass materials such as various agriculture and forestry byproducts (including straw, rice hull, corn cob, bean hull, tree branch, wood, etc.), industrial processing organic waste materials (such as sugar cane waste residue in sugar industry, wood dust in wood processing, leftover materials, etc.) can obtain the biomass carbon powder in the case under similar conditions, and other suitable fineness is also suitable for the denitration powder of the patent.
The pulverized particle size of the biomass denitration powder is not particularly limited as long as it can be injected into the system through an air injection gun at a predetermined rate.
Regarding the spraying position of the biomass denitration powder:
the (dry method) cement kiln production line is very large in volume, nitrogen-containing pollutants are generated in a plurality of devices or production links, and therefore, the positions for adding the denitration agent are particularly selected and combined in a plurality of modes. However, the inventors have found through research that the addition position of the denitrifier has a significant influence on the final effect, and the denitration effect cannot achieve the expected technical effect when the denitrifier is added at the addition position known in the prior art or in a device other than the device of the present invention. The inventor creatively proposes the following combination of addition positions through research:
in the present application, the biomass denitration powder (as shown in the attached figure 2 of the specification) can be used in the following way:
and spraying the biomass denitration powder at the position from the rear section of the decomposing furnace to the inlet of the lowest stage cyclone (preferably from the outlet of the decomposing furnace to the upstream part of the lowest stage cyclone connected with the air pipe, and most preferably from the outlet of the decomposing furnace). The rear section of the decomposing furnace is a section between one third of the height of the decomposing furnace and the outlet of the decomposing furnace, and the direction between one third of the height of the decomposing furnace and the outlet of the decomposing furnace is from bottom to top. The lowest stage of cyclone is the lowest stage of cyclone from bottom to top in the first stage or the multi-stage cyclones. For example, the lowest stage cyclone of the five-stage cyclone is a C5 cyclone, the lowest stage cyclone of the six-stage cyclone is a C6 cyclone, and so on. And the outlet of the decomposing furnace is connected with the lowest stage cyclone cylinder through a connecting air pipe. The connecting air pipe can be in any shape determined according to actual conditions. Typically, the connecting duct comprises an ascending portion and a descending portion. And the ascending part of the connecting air pipe is connected with the outlet of the decomposing furnace and used for leading out gas. The downstream part of the connecting air pipe is connected with the upstream part and the inlet of the lowest stage of cyclone and is used for guiding gas into the cyclone. The ascending portion and the descending portion are intended to indicate that gas flows first through the ascending portion and then through the descending portion, and are not intended to define the gas flow direction in other meanings.
In one embodiment, the connecting duct is curved, having a shape with a middle portion higher than one or both of the two ends, such as an inverted U-shape or an n-shape (also known as a gooseneck). In this case, the upward flow portion also means a portion where the gas travels upward, and the downward flow portion also means a portion where the gas travels downward. The furnace outlet is also referred to herein as the burnout zone.
The "position" described herein refers to a position at which the biomass denitration dust is sprayed, and may be used interchangeably with the "spraying position".
In one embodiment of the present invention, the biomass denitration dust is sprayed from the position by using compressed air (e.g., high-pressure air).
In one embodiment, the present application may employ multiple/multiple layer lances at the injection location. According to the invention, through the arrangement of the multiple layers of spray guns (preferably, the spray guns of all layers are staggered by a certain angle), full coverage and uniform spraying are formed, and the utilization efficiency of the biomass flue gas denitration agent is improved.
The amount of the biomass denitration powder is 0.01 to 1.0 wt% (e.g., 0.01, 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, 0.08, 0.09, 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95 wt%) of the amount of the raw cement feed. The flue gas denitration efficiency realized by the method can reach more than 90%, such as 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99% and 99.5%.
In the present invention, the denitration efficiency is (pre-denitration background concentration-post-denitration emission concentration)/pre-denitration background concentration 100%.
In addition, the invention can realize real-time adjustment of the spraying amount of the biomass denitration powder according to the NOx content of the flue gas by selecting the type and the adding position of the denitration agent and using a metering feeder, a flow control device and the like in a biomass denitration system, thereby achieving continuous and accurate control of the emission index. If dust and water agents are added at other locations, such as the front end of the rotary kiln, accurate control of emissions in real time is often not possible.
In conclusion, the spraying position of the biomass denitration powder is extremely exquisite (the optimal spraying position is determined based on thousands of hours of industrial online tests), the spraying amount of the biomass denitration powder can be automatically controlled and adjusted according to the NOx content of the flue gas, and economic, environment-friendly and efficient flue gas denitration is realized. The invention is a technical innovation on the basis of the existing denitration technology, introduces more hydrocarbon compounds through biomass powder, and performs multiple mixing with the material to be treated under the environment with proper temperature and atmosphere, thereby obviously improving the removal rate and efficiency of NOx. More importantly, the invention innovatively takes the powder from the biomass as the main component of the denitrifier, and introduces a comprehensive treatment concept of waste utilization in the environmental protection industry of cement. The main component biomass denitration powder of the used denitration agent is prepared by biomass carbonization and thermal cracking with wide sources, the raw materials are easily obtained, green, environment-friendly and renewable, meanwhile, the equipment investment is small, the process is simple and reliable, the clinker quality is not influenced, the denitration efficiency is high, the cost is low, compared with SCR and SNCR, the denitration agent has incomparable technical, economic and environment-friendly advantages, and has huge application prospect and potential in the field of flue gas denitration in the cement industry.
Unless otherwise specified, percentages, ratios, contents or parts described herein are by weight. Concentrations described herein are weight concentrations.
The temperature units "degrees" referred to herein are degrees celsius.
The application the denitrifier is a denitrifier for removing flue gas. Therefore, the term "biomass denitration agent" in the present application may also be referred to as "biomass flue gas denitration agent", and the two may be used interchangeably. Similarly, the term "biomass denitration dust" in the present application may also be referred to as "biomass flue gas denitration dust", and the two may be used interchangeably as well. The term "aqueous biomass denitration agent" in the application may also be referred to as "aqueous biomass flue gas denitration agent", and the two may be used interchangeably as well. Herein, the denitration agent refers to a denitration water agent and/or denitration powder.
Drawings
FIG. 1: one embodiment of position 1, position 2 and position 3 is shown, where the relative positions of air, clinker, cooler and fuel are also shown.
FIG. 2: one embodiment of spraying the denitrifier from position 2.
FIG. 3: an exemplary spray gun arrangement.
FIG. 4: an exemplary powder application device.
Description of the reference numerals
1. Position 1
2. Position 2
3. Position 3
4. Rotary kiln
5. Kiln tail smoke chamber
6. Front section of decomposing furnace
7. Middle section of decomposing furnace
8. Rear section of decomposing furnace
9. Connecting the up-going part of the wind pipe
10. Connecting the downstream part of the wind pipe
C5 cyclone
12. Cyclone connecting air pipe
C4 cyclone
C3 cyclone
C2 cyclone
16.C1 cyclone
17. Tertiary air pipe
21. Living beings denitration powder storage bin
22. Metering feeder
23. Powder conveying pipeline
24. Air compressor
25. Gas flowmeter
26. Gas valve
27. Gas delivery pipeline
201. Biomass denitration powder storage equipment
202. Valve device
203. Metering device
204. Metering device
205. Pump delivery device
206. Compressed air device
207. Atomizing spray gun equipment
Detailed Description
In order to better understand the present invention, the following examples are further provided to illustrate the present invention, but the present invention is not limited to the following examples. The experimental operations described in the following examples are all routine operations unless otherwise specified; the reagents and materials are commercially available, unless otherwise specified. The cement line used in the examples and comparative examples was a five stage preheater and thus the C5 cyclone was the lowest stage cyclone.
Example 1:
the biomass denitration powder comprises the following components in percentage by mass: 60% of coal gangue powder, 20% of graphite powder and 20% of biomass carbon powder.
The embodiment is used on a 5000t/d novel dry method cement production line in Guangdong, and the actual concentration monitoring of NOx in flue gas is 880mg/m3. The spraying system in the prior art (biomass composite denitration) is used for spraying biomass denitration powder at the outlet part (position 2) of the decomposing furnace through a pneumatic pump and a powder spray gun. The spraying amount of the biomass denitration powder is 2t/h (about 0.5 percent of the feeding amount of the cement raw material), and the concentration of NOx in the flue gas can be stabilized at 340mg/m after 10 minutes3About, cement kiln flue gas denitration efficiency is 61%.
Example 2:
the biomass denitration powder comprises the following components in percentage by mass: 70% of coal gangue powder, 20% of graphite powder and 10% of biomass carbon powder.
The embodiment is used on a 5000t/d novel dry method cement production line in Guangdong, and the actual concentration monitoring of NOx in flue gas is 800mg/m3. The spraying system in the prior art (biomass composite denitration) is used for spraying biomass denitration powder at the outlet part (position 2) of the decomposing furnace through a pneumatic pump and a powder spray gun. The spraying amount of the biomass denitration powder is 2.5t/h (about 0.7 percent of the feeding amount of the cement raw material), and the concentration of NOx in the flue gas can be stabilized at 320mg/m after 10 minutes3About, cement kiln flue gas denitration efficiency is 60%.
Example 3:
the biomass denitration powder comprises the following components in percentage by mass: 70% of coal gangue powder, 25% of graphite powder and 5% of biomass carbon powder.
The embodiment is used on a 5000t/d novel dry method cement production line in Guangdong, and the concentration of NOx in flue gas is actualThe monitoring was 820mg/m3. The spraying system in the prior art (biomass composite denitration) is used for spraying biomass denitration powder at the outlet part (position 2) of the decomposing furnace through a pneumatic pump and a powder spray gun. The spraying amount of the biomass denitration powder is 3t/h (about 0.8 percent of the feeding amount of the cement raw material), and the concentration of NOx in the flue gas can be stabilized at 300mg/m after 10 minutes3About, cement kiln flue gas denitration efficiency is 63%.
Example 4: preparation of Biomass denitration powder
About 10 tons of corn straws are collected, air is isolated in a carbonization furnace, the corn straws are heated to about 600 ℃, carbonization is carried out to obtain about 4 tons of carbon-containing solid products (namely biomass carbon), the carbon-containing solid products are ground to the fineness of 200 meshes, and the carbon-containing solid products are uniformly mixed with 4 tons of graphite ore powder and 12 tons of coal gangue powder to obtain 20 tons of biomass denitration powder which is used in example 1. The biomass denitration powders used in example 3 were prepared using different amounts of the aforementioned biomass carbon powder, gangue powder, and graphite ore powder.
Example 5: preparation of Biomass denitration powder
Collecting about 5 tons of aired shells, isolating air in a carbonization furnace, heating to about 700 ℃, carbonizing to obtain about 2 tons of biomass charcoal, grinding to the fineness of 200 meshes, and uniformly mixing with 4 tons of graphite ore powder and 14 tons of coal gangue powder to obtain 20 tons of biomass denitration powder for example 2 and comparative example 3.
Comparative example 1:
the comparative example is used on a 5000t/d novel dry method cement production line in Guangdong, and the actual concentration monitoring of NOx in flue gas is 800mg/m3. By using the prior art (SNCR selective non-catalytic reduction) spraying system, 900L/h (about 0.25 percent of raw material feeding amount) of ammonia water with the concentration of 20 percent is sprayed at the outlet of the decomposing furnace through a water agent spray gun, 8 spray guns are arranged at an interval of 45 degrees on the same plane, and the denitration water agent is atomized into denitration water agent by utilizing high-pressure air<Droplets of 10 μm or less. After 10 minutes, the concentration of NOx in the smoke can be stabilized at 350mg/m3About, flue gas denitration efficiency is only 56%.
Comparative example 2:
the comparative example is used on a 5000t/d novel dry-process cement production line in Anhui province, and the actual monitoring of the concentration of NOx in flue gas is 800mg/m3. Spraying 3-5t/h (1-1.5% of raw material feeding amount) of coal powder at the outlet of the decomposing furnace by using an air pump, wherein the concentration of NOx in the flue gas can be stabilized at 800mg/m and 750-3About, flue gas denitration efficiency is below 10%, hardly has the denitration effect.
Comparative example 3:
the comparative example is used on a 5000t/d novel dry method cement production line in Guangdong, and the actual monitoring of the concentration of NOx in flue gas is 800mg/m3Left and right. The biomass denitration powder (the mass percentage of each component in the biomass denitration powder is 70 percent of coal gangue powder, 20 percent of graphite powder and 10 percent of biomass carbon powder) is sprayed at a kiln tail smoke chamber (position 1). The spraying amount of the biomass denitration powder is 2t/h (about 0.5 percent of the feeding amount of the cement raw meal), and the concentration of NOx in the flue gas can be stabilized at 720mg/m after 10 minutes3About, cement kiln flue gas denitration efficiency is 10%, and the effect is showing inadequately.
Table 1: denitration efficiency summary table
According to the embodiment and the comparative example, firstly, compared with the traditional coal powder and ammonia water denitration agent, the biomass denitration powder used in the invention has higher denitration efficiency; in addition, the denitration position selected by the patent has more excellent denitration effect compared with other positions. If the two are combined, an economic, environment-friendly and efficient denitration technical scheme can be further obtained, and the technical effect of the scheme cannot be achieved by all the prior art at present.
Although the present invention has been described with reference to the preferred embodiments, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (11)
1. The utility model provides a novel dry process is living beings denitration powder for cement kiln, living beings denitration powder includes: 50-90 wt% of coal gangue powder; 10-40 wt% of graphite ore powder; and 5-30 wt% of biomass carbon powder;
the biomass carbon powder in the biomass denitration powder is ground powder of biomass carbon, and the biomass carbon is a carbon-containing solid substance obtained by carbonizing a biomass material under an anoxic and heating condition.
2. The novel biomass denitration powder for dry process cement kiln as claimed in claim 1, wherein the biomass material comprises any non-petrochemical plant material, animal material or microorganism material.
3. The biomass denitration powder for cement kilns as claimed in claim 1 or 2, wherein the biomass material comprises agriculture and forestry byproducts and/or industrial processing organic waste; the agroforestry by-products preferably include: branches, leaves, bark, wood, grass, corncobs, straw, rice hulls, fruit shells, shrubs and vines, or the industrial organic processing waste preferably comprises: bagasse, wood waste (such as wood chips, wood processing waste, and woodlands), and straw waste.
4. The novel biomass denitration powder for the dry method cement kiln as claimed in any one of claims 1 to 3, wherein the heating conditions include conditions of heating to 400-800 ℃.
5. The use method of the novel biomass denitration powder for the dry method cement kiln as set forth in any one of claims 1 to 4, characterized in that the biomass denitration powder is used in the manner as follows:
and spraying biomass denitration powder between the rear section of the decomposing furnace and the inlet of the lowest stage of cyclone.
6. The method according to claim 5, wherein the position between the rear section of the decomposing furnace and the inlet of the lowest stage cyclone is the part of the decomposing furnace from the outlet to the lowest stage cyclone, which is connected with the air pipe and goes upward.
7. The method according to claim 5 or 6, wherein the position between the rear section of the decomposing furnace and the inlet of the lowest stage cyclone is the outlet part of the decomposing furnace.
8. A novel biomass denitration system for a dry-method cement kiln comprises biomass denitration powder and a powder spraying device, wherein the biomass denitration powder is as defined in any one of claims 1 to 4; the powder spraying device comprises a powder storage bin, a fan and a powder spray gun, wherein the powder spray gun is arranged between the rear section of the decomposing furnace and the inlet of the lowest stage of cyclone.
9. The biomass denitration system for the novel dry method cement kiln as claimed in claim 8, wherein the powder spraying device further comprises a metering feeder, a pneumatic conveying pump, a roots blower, a powder pipeline, a compressed air pipeline and a valve.
10. The system according to claim 8 or 9, wherein the position between the rear section of the decomposing furnace and the inlet of the lowest stage cyclone is the ascending part of the connecting air pipe between the outlet of the decomposing furnace and the lowest stage cyclone.
11. The system according to any one of claims 8 to 10, wherein the position from the rear section to the inlet of the lowest stage cyclone in the decomposing furnace is the outlet portion of the decomposing furnace.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910107957.9A CN111514739A (en) | 2019-02-02 | 2019-02-02 | Novel composite biomass denitration powder for dry-process cement kiln, use method of composite biomass denitration powder and denitration system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910107957.9A CN111514739A (en) | 2019-02-02 | 2019-02-02 | Novel composite biomass denitration powder for dry-process cement kiln, use method of composite biomass denitration powder and denitration system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111514739A true CN111514739A (en) | 2020-08-11 |
Family
ID=71910247
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910107957.9A Pending CN111514739A (en) | 2019-02-02 | 2019-02-02 | Novel composite biomass denitration powder for dry-process cement kiln, use method of composite biomass denitration powder and denitration system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111514739A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113499770A (en) * | 2021-08-18 | 2021-10-15 | 天津水泥工业设计研究院有限公司 | Denitration agent prepared by using waste denitration catalyst and cement kiln denitration method |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102101013A (en) * | 2010-12-10 | 2011-06-22 | 华北电力大学 | Method for preparing desulfurization denitration agent, methanol and acetone by biomass pyrolysis |
| CN102512925A (en) * | 2011-12-07 | 2012-06-27 | 浙江天蓝环保技术股份有限公司 | Denitration process and denitration apparatus for cement kiln flue gas |
| CN103495434A (en) * | 2013-09-13 | 2014-01-08 | 北京矿迪科技有限公司 | Desulphurization and denitration agent based on waste biomass and preparation method thereof |
| CN103525502A (en) * | 2013-09-30 | 2014-01-22 | 南京师范大学 | Coal-fired power plant boiler biomass reburning denitration agent and preparation method thereof |
| CN104084035A (en) * | 2014-07-30 | 2014-10-08 | 淄博联创环保科技有限公司 | Dry-process denitration process of rotary cement kiln and equipment |
| CN106268279A (en) * | 2016-08-29 | 2017-01-04 | 北京工业大学 | A kind of method of denitration of dry-process cement rotary kiln flue gas |
| CN108404617A (en) * | 2018-03-12 | 2018-08-17 | 陈琪雯 | A kind of technique of Novel flue gas desulphurization denitration |
-
2019
- 2019-02-02 CN CN201910107957.9A patent/CN111514739A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102101013A (en) * | 2010-12-10 | 2011-06-22 | 华北电力大学 | Method for preparing desulfurization denitration agent, methanol and acetone by biomass pyrolysis |
| CN102512925A (en) * | 2011-12-07 | 2012-06-27 | 浙江天蓝环保技术股份有限公司 | Denitration process and denitration apparatus for cement kiln flue gas |
| CN103495434A (en) * | 2013-09-13 | 2014-01-08 | 北京矿迪科技有限公司 | Desulphurization and denitration agent based on waste biomass and preparation method thereof |
| CN103525502A (en) * | 2013-09-30 | 2014-01-22 | 南京师范大学 | Coal-fired power plant boiler biomass reburning denitration agent and preparation method thereof |
| CN104084035A (en) * | 2014-07-30 | 2014-10-08 | 淄博联创环保科技有限公司 | Dry-process denitration process of rotary cement kiln and equipment |
| CN106268279A (en) * | 2016-08-29 | 2017-01-04 | 北京工业大学 | A kind of method of denitration of dry-process cement rotary kiln flue gas |
| CN108404617A (en) * | 2018-03-12 | 2018-08-17 | 陈琪雯 | A kind of technique of Novel flue gas desulphurization denitration |
Non-Patent Citations (2)
| Title |
|---|
| 赵毅;韩钟国;韩颖慧;要杰;: "干法烟气同时脱硫脱硝技术的应用及进展", 电力环境保护, no. 04, pages 22 - 25 * |
| 金波等著: ""山东省城市酸沉降及控制研究"", 30 November 2005, 山东大学出版社, pages: 182 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113499770A (en) * | 2021-08-18 | 2021-10-15 | 天津水泥工业设计研究院有限公司 | Denitration agent prepared by using waste denitration catalyst and cement kiln denitration method |
| CN113499770B (en) * | 2021-08-18 | 2023-03-21 | 天津水泥工业设计研究院有限公司 | Denitration agent prepared by using waste denitration catalyst and cement kiln denitration method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111514726B (en) | Novel composite biomass denitration agent for dry-method cement kiln, application method of novel composite biomass denitration agent and denitration system | |
| CN107541224B (en) | A kind of biomass continuously carbonizing treatment process | |
| CN103816780B (en) | A kind of low-temperature flue gas desulphurization denitration is except ammonia integral process | |
| CN105543471B (en) | A kind of NOx control methods based on suppression Ore Sintering Process fuel bound nitrogen conversion | |
| CN106350084B (en) | A kind of the biochemical substances fuel processing system and its production method of high performance active carbon | |
| CN108870407A (en) | It is a kind of that the method for sludge is handled based on the chemical chain gasification that copper ashes is oxygen carrier and realizes the device of this method | |
| CN100400413C (en) | Method for preparing low-iror anhydrous sodium sulfide by one-step reduction of Glauber salt from coke oven gas | |
| CN110960967A (en) | Pre-combustion denitration system and method for kiln | |
| NL2034400B1 (en) | Biochar—based compound fertilizer | |
| CN109141028A (en) | The low NO of grate-kiln pelletizingxProcess units and Pellet production method | |
| CN104826489A (en) | Activated carbon and low temperature catalyst-based combined desulfurization denitration fluidized bed device | |
| CN104387159A (en) | Method for removing harmful gases in boiler exhaust gas | |
| CN207163232U (en) | The low NOx process units of grate-kiln pelletizing process | |
| CN111514738A (en) | Novel composite biomass denitration water agent for dry-process cement kiln, use method of composite biomass denitration water agent and denitration system | |
| CN103396186A (en) | Technology and device for producing ammonium phosphate sulfate product with sewage treatment slag | |
| CN211514054U (en) | Novel dry process is living beings deNOx systems for cement kiln | |
| CN111514739A (en) | Novel composite biomass denitration powder for dry-process cement kiln, use method of composite biomass denitration powder and denitration system | |
| CN209917627U (en) | Novel dry process is living beings deNOx systems for cement kiln | |
| CN204768221U (en) | Cement kiln flue gas SNCR deNOx systems | |
| CN201832542U (en) | Selective flue gas desulfuration and denitration apparatus for sintering machines | |
| CN112742205A (en) | Novel biomass denitration agent for dry-process cement kiln, use method of novel biomass denitration agent and denitration system | |
| CN201583138U (en) | Multi-stage rotary jet decomposing furnace | |
| CN203853017U (en) | Desulfurization and denitrification device for low-temperature waste gas of flue of coke oven | |
| CN113318729B (en) | Preparation method of high-airspeed and poisoning-resistant rare earth-based denitration catalyst powder | |
| CN112973415B (en) | Cement kiln device and SNCR denitration method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |