CN102506575A - Treatment process for lignite upgrading waste water and lignite upgrading system - Google Patents
Treatment process for lignite upgrading waste water and lignite upgrading system Download PDFInfo
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- CN102506575A CN102506575A CN2011102819343A CN201110281934A CN102506575A CN 102506575 A CN102506575 A CN 102506575A CN 2011102819343 A CN2011102819343 A CN 2011102819343A CN 201110281934 A CN201110281934 A CN 201110281934A CN 102506575 A CN102506575 A CN 102506575A
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10F—DRYING OR WORKING-UP OF PEAT
- C10F5/00—Drying or de-watering peat
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B47/00—Destructive distillation of solid carbonaceous materials with indirect heating, e.g. by external combustion
- C10B47/02—Destructive distillation of solid carbonaceous materials with indirect heating, e.g. by external combustion with stationary charge
- C10B47/04—Destructive distillation of solid carbonaceous materials with indirect heating, e.g. by external combustion with stationary charge in shaft furnaces
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B49/00—Destructive distillation of solid carbonaceous materials by direct heating with heat-carrying agents including the partial combustion of the solid material to be treated
- C10B49/02—Destructive distillation of solid carbonaceous materials by direct heating with heat-carrying agents including the partial combustion of the solid material to be treated with hot gases or vapours, e.g. hot gases obtained by partial combustion of the charge
- C10B49/04—Destructive distillation of solid carbonaceous materials by direct heating with heat-carrying agents including the partial combustion of the solid material to be treated with hot gases or vapours, e.g. hot gases obtained by partial combustion of the charge while moving the solid material to be treated
- C10B49/06—Destructive distillation of solid carbonaceous materials by direct heating with heat-carrying agents including the partial combustion of the solid material to be treated with hot gases or vapours, e.g. hot gases obtained by partial combustion of the charge while moving the solid material to be treated according to the moving bed type
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L5/00—Solid fuels
- C10L5/40—Solid fuels essentially based on materials of non-mineral origin
- C10L5/44—Solid fuels essentially based on materials of non-mineral origin on vegetable substances
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
- F23G5/44—Details; Accessories
- F23G5/46—Recuperation of heat
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
- F23G7/001—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals for sludges or waste products from water treatment installations
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
- F23G7/04—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste liquors, e.g. sulfite liquors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K1/00—Preparation of lump or pulverulent fuel in readiness for delivery to combustion apparatus
- F23K1/04—Heating fuel prior to delivery to combustion apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2206/00—Waste heat recuperation
- F23G2206/10—Waste heat recuperation reintroducing the heat in the same process, e.g. for predrying
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2206/00—Waste heat recuperation
- F23G2206/20—Waste heat recuperation using the heat in association with another installation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K2201/00—Pretreatment of solid fuel
- F23K2201/20—Drying
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- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/10—Biofuels, e.g. bio-diesel
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- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel
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- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
- Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines
Abstract
The invention discloses treatment process for lignite upgrading waste water. The treatment process includes delivering exhaust gas with high content of steam, which is generated in a lignite upgrading process, to a combustor to be incinerated, and then delivering heat-conducting media into a heat-conducting medium inlet of a lignite upgrading device. A traditional idea that lignite upgrading waste water is treated after being generated is changed, pollutant is in harmless treatment by means of high-temperature incineration before the waste water is generated, and accordingly circulating water capable of being recycled for production can be obtained. The exhaust gas with high content of steam, which is generated due to lignite upgrading, is delivered into the combustor to be incinerated, accordingly, only a connecting pipeline needs to be arranged between the lignite upgrading device and the combustor, a treatment process is simple, involved equipment is few, and treatment cost is low. The invention further discloses a lignite upgrading system.
Description
Technical field
The present invention relates to the waste material that brown coal upgrading process produces is carried out the Treatment Technology field, is the treatment process of the brown coal upgrading waste water that a kind of cost is lower, processing procedure is easy, treatment effect is good specifically, and brown coal upgrading system.
Background technology
Brown coal are claimed the bavin coal again, are the minimum coals of degree of coalification, account for 40% of global coal reserves; Account for 13% of Chinese coal reserves; Reserves are very huge, but because brown coal moisture high (about 20%～40%), calorific value are low, easy-weathering and spontaneous combustion, the cost of transportation of unit energy is high; Be unfavorable for long distances and storage, this has just restricted application, the development of brown coal.Therefore, people begin brown coal are studied in recent years, develop suitable upgrading treatment process.
Brown coal are reaction and variation below main the generation in the upgrading pyrolytic process:
1, the dry degassing stage (normal temperature～about 300 ℃)
Contain wet moisture in the brown coal and receive thermal evaporation, coal obtains drying, has the gas that is adsorbed in the coal hole to deviate from simultaneously.About the decarboxylation reaction takes place more than 200 ℃, a large amount of CO are arranged in the gas of separating out greatly
2This stage can be accomplished the drying and the part deoxidation of brown coal.The brown coal that have burst apart owing to dehydration causes in dry run, and coal particle distribution small grain size increases, even produces more trickle coal dust.What this stage produced mainly is water, also has number of C O
2, CH
4Deng gas.
2, the first thermal decomposition stage (about 300～about 600 ℃)
This stage is active catabolic phase, and with the macromolecular depolymerization of brown coal be decomposed into key reaction, a large amount of volatile substances generate and overflow.Tar generated in this stage; Combustible component (CH in the coal
4, H
2, CO, C
2～C
3) increase with the temperature rising; Solid particle might further diminish.The big molecule end oxygenatedchemicals of this stage coal begins to decompose, and generates CO
2, water and phenols (mainly being higher phenols); During 500 ℃ of left and right sides, the big molecule aromatic fused ring compounds in side chain fracture and the decomposition of coal generate aliphatic hydrocarbon, discharge H simultaneously
2This stage is a major product with the semicoke that obtains tar and caloric value and significantly improve.
3, the second thermal decomposition stage (about 600～about 900 ℃)
Little molecular side chain (CH with polymerisation and aromatic hydrocarbon edge joint
3) or hydrogen come off the reaction be main.Gas yield has significantly raising.H in the coal gas
2Content increases very fast, and other component volume contents reduce relatively.Under the isothermal pyrolytical condition, because tar steam secondary pyrolysis at high temperature, oily productive rate improves with temperature and reduces.The semicoke volatile matter improves gradually with temperature and reduces, and fixed carbon content increases.The semicoke of this stage with the coal gas that obtains high yield and low volatile, high fixed carbon content is major product.
Also contain oligo-element nitrogen and sulphur in the coal.They also can carry out following reaction:
S+O
2→SO
2
SO
2+3H
2→H
2S+2H
2O
N
2+3H
2→2NH
3
N
2+H
2O+2CO→2HCN+1.5O
2
NH
3+C→HCN+H
2
CH
4+NH
3→HCN+3H
2
Therefore, the product after the brown coal pyrolysis has lignite semi-coke, coal gas, water, carbon dioxide, phenols (mainly being higher phenols), aliphatic hydrocarbon, ammonia, hydrogen cyanide, pyridines, quinolines, hydrogen sulfide, sulfur dioxide and thiophene etc.So in the upgrading processing procedure of brown coal, inevitably run into the problem of wastewater treatment, but because the brown coal process for upgrading worldwide is novel process, the processing of the waste water of this technology discharging or reuse method also belong to up to now blank.Research shows that brown coal process for upgrading and coking process are close, and the water quality of brown coal upgrading waste water is with close through the coking chemical waste water water quality after ammonia still process and the dephenolize processing.Coking chemical waste water is that coking, coal gas are in high-temperature retorting, purification and byproduct removal process; Generation contains the industrial organic waste water of a kind of high CODcr, high phenol value, high ammonia nitrogen and the intractable of heterocyclic compounds such as volatile phenol, polycyclic aromatic hydrocarbon and oxygen, sulphur, nitrogen, and wherein contained pollutant can be divided into inorganic pollution and organic pollution two big classes.Wherein, inorganic pollution generally exists with the form of ammonium salt, and organic matter also comprises aliphatic compound, heterocycle compound and polycyclic aromatic hydrocarbon etc. except that phenolic compound.Heterocycle compound comprises diazine, azepine biphenyl, azepine acenaphthene, naphthazine, pyridine, quinoline, carbazole, indoles etc.; Polycyclic compound comprises naphthalene, anthracene, phenanthrene etc.Organic matter in the coking chemical waste water (in COD) content is high, and since in the waste water contained organic matter be mostly heterocyclic compounds such as aromatic compound and fused ring compound and pyridine, quinoline, indoles, its BOD
5/ COD value is low, and biodegradability is poor.Wherein cyanide, aromatic ring, condensed ring, heterocyclic compound are all to the toxic effect of microorganism, and some even the concentration in waste water have surpassed the limit that microorganism can tolerate.
At present, the improvement of coking chemical waste water mainly contains following three kinds of technologies:
(1) two sections aerobe dephenolizing process of time-delay
This technology is made up of facilities such as grease removal tank, regulating reservoir, floation tank, aeration tank, secondary sedimentation tank, coagulative precipitation tank and air blasts basically.Common biochemical treatment facility can be with effective removal such as the phenols in the coking chemical waste water, cyanide but owing to this technological limitation, the CODcr in the waste water, BOD
5, pollutant such as ammonia nitrogen all is difficult to up to standard.
(2) biological denitrification process
Although A/O and A2/O biological denitrification process obtain the application of certain limit on Treatment of Coking Effluent; Proved that its technology is more advanced reliable; But still exist many problems; As processing structures is big, investment is high, operating cost is high, the more common biochemical treatment of capital expenditure of biological denitrification process design increases about 30%.
(3) catalysis wet-type oxidation technology
This PROCESS FOR TREATMENT operating cost is suitable with (1) said technology, just needs high temperature resistant, high-tension apparatus, applies to it and causes certain difficulty.
Therefore; Even people adopt the treatment process of above-mentioned coking chemical waste water during to brown coal upgrading wastewater treatment; Also can produce the problem that above-mentioned various technology is brought; Moreover the waste water that the brown coal process for upgrading produces is a kind of industrial organic waste water that contains high CODcr, high phenol value, high ammonia nitrogen and the intractable of heterocyclic compounds such as volatile phenol, polycyclic aromatic hydrocarbon and oxygen, sulphur, nitrogen, and the waste water that is produced is more.
The application inventor once developed such brown coal upgrading waste water treatment process; Promptly adopt flocculation sediment; The upgrading brown coal that then produce with the brown coal upgrading again are as adsorbents adsorb; Adsorb with activated carbon at last, though the more aforesaid treatment process of this technology is more excellent, can produce handling process length, handle the problem that device therefor is many, need big pond.
Summary of the invention
In view of this, the purpose of this invention is to provide a kind of treatment process of brown coal upgrading waste water, simplify processing procedure, reduce processing cost.Based on this, the present invention also provides a kind of brown coal upgrading system.
For solving the problems of the technologies described above, technical scheme of the present invention is:
A kind of treatment process of brown coal upgrading waste water comprises: the high water vapor content waste gas that produces in the brown coal upgrading process is delivered in the burner burned, then send into the heat-conducting medium inlet of brown coal device for improving quality in company with heat-conducting medium.
Preferably, also comprise the steps: the high-temperature flue gas that the heat-conducting medium outlet of brown coal device for improving quality is discharged is comprised the processing of condensation, the water that obtains is recycled.
Preferably, said burner is to be arranged on the burner that is used for providing to the brown coal device for improving quality heat-conducting medium feeding mechanism of heat-conducting medium.
The high-temperature flue gas of preferably, the heat-conducting medium outlet of brown coal device for improving quality being discharged carries out carrying out condensation again or in waste heat recovery, carrying out condensation after the waste heat recovery.
Preferably, the waste gas that obtains after the condensation is comprised again the harmless treatment of desulfurization, denitration.
Preferably, deliver in the burner at high water vapor content waste gas and carry out dust removal process earlier before burning.
Preferably, the air distribution amount during burning is combustible 50%～300% of the oxygen demand of fully burning.
Preferably, the air distribution amount during burning is combustible 120% of the oxygen demand of fully burning.
Preferably, the ignition temperature during burning is controlled at 800 ℃～1600 ℃.
Preferably, the ignition temperature during burning is controlled at 900 ℃～1200 ℃.
A kind of brown coal upgrading of the present invention system comprises:
The brown coal device for improving quality is provided with the heat-conducting medium import;
The heat-conducting medium feeding mechanism is connected with said heat-conducting medium import, carries heat-conducting medium to said brown coal device for improving quality;
The exhaust end of said brown coal device for improving quality is communicated with said heat-conducting medium feeding mechanism, and the burner that the high water vapor content waste gas that exhaust end is discharged is fed through in the heat-conducting medium feeding mechanism burns.
Preferably, also comprise a recycling and processing device, with the heat-conducting medium outlet conducting of brown coal device for improving quality, the high-temperature flue gas that outlet is discharged to heat-conducting medium comprises the processing of condensation.
Preferably, said recycling and processing device carries out carrying out condensation process again or in waste heat recovery, carrying out condensation process after the waste heat recovery to the high-temperature flue gas of the heat-conducting medium outlet discharge of brown coal device for improving quality.
Preferably, the waste gas that obtains after to condensation of recycling and processing device comprises the harmless treatment of desulfurization, denitration again.
Preferably, said recycling and processing device comprises waste heat boiler device and the flue gas desulfur device that connects successively, and said waste heat boiler device carries out condensation to high-temperature flue gas, and said flue gas desulfur device carries out gas pollutant to condensed flue gas to be handled.
Preferably, also comprise a dust arrester, the import of said dust arrester is connected with the exhaust end of said brown coal device for improving quality, and the outlet of said dust arrester is communicated with burner, carries out dust removal process earlier before high water vapor content waste gas is burned in delivering to burner.
Preferably, said dust arrester is a cyclone dust collector.
Preferably, said burner comprises burner, wind mixed chamber, the combustion chamber that is communicated with successively.
Preferably, the volume of said burner is less than wind mixed chamber, and the volume of said wind mixed chamber is less than the combustion chamber.
Preferably, said burner comprises main fuel inlet, main fuel combustion air inlet, high water vapor content exhaust gas entrance, waste gas combustion air inlet, and wherein, said high water vapor content exhaust gas entrance is communicated with the exhaust end of said brown coal device for improving quality.
Preferably; Said burner comprises burner, wind mixed chamber, the combustion chamber that is communicated with successively; Said burner comprises main fuel inlet, main fuel combustion air inlet, high water vapor content exhaust gas entrance; Waste gas combustion air inlet, wherein, said high water vapor content exhaust gas entrance is connected with the outlet of dust arrester.
Preferably, said brown coal device for improving quality comprises shell, is separately positioned on feed end, the discharge end at shell two ends, is provided with two-stage exhaust passage at least from inside to outside from the shell center, said exhaust passage be arranged on the exhaust end conducting on the shell; In the cavity of said shell between feed end and discharge end, be provided with heat-conducting mechanism; Said heat-conducting mechanism is being provided with the heat-conducting medium import near the discharge end place, is being provided with the heat-conducting medium outlet near the feed end place, and said heat-conducting mechanism comprises many groups heat-conducting unit spaced apart; Said heat-conducting unit comprises a plurality of heat pipes; Said heat pipe and heat-conducting medium import and heat-conducting medium outlet conducting longitudinally are provided with a plurality of fins downward-sloping with vertical direction, the fin that is provided with between the heat pipe on side, exhaust passage between the adjacent heat pipe; The bottom tilts to the direction away from the exhaust passage, shelters from the exhaust outlet of offering on the wall of exhaust passage.
Compared with prior art; The treatment process of brown coal upgrading waste water of the present invention; Owing to all being sent in the burner, burns the high water vapor content waste gas of brown coal upgrading generation, thereby, simplify handling process greatly; Equipment used in the processing procedure is less, only need between brown coal device for improving quality and burner, connecting line be set; Thereby with respect to the sort of flocculation earlier, the treatment process of absorption, second adsorption again; Burning method of the present invention is handled waste water, is before " waste water " forms, and just it is carried out burning disposal; Not only possibly bring the various organic pollution deep oxidations of pollution is free of contamination gas; The condensable subsequently reuse of steam is also managed conveying between the device, carrying with a large amount of aqueous waters because as other sewage treatment process, high-temperature vapor is not condensed into aqueous water, therefore then throughout; Treatment process of the present invention is practiced thrift power, consumptive material, medicament, manual work, and these operating costs are very considerable.
Brown coal upgrading of the present invention system; Adopt technology as above to carry out the structure setting, make the steam that is contained in the high water vapor content waste gas be further heated in the gas of back entering as the used heat-conducting medium of brown coal upgrading, because the high specific heat capacity of steam; And then increased the heat that the unit heat-conducting medium is contained; Simultaneously because sneaking into of steam makes that the heat transfer efficiency between heat-conducting medium and the brown coal increases, so; Both increased total amount of heat; Strengthened the transmission of heat again, made the treatment effect of brown coal upgrading of the present invention system be greatly improved, these liftings can be embodied in decline or the increase of single device treating capacity or the lifting of the quality of product own of energy consumption of unit product.
Description of drawings
Fig. 1 is the flow chart of the treatment process of brown coal upgrading waste water of the present invention;
Fig. 2 is the sketch map of treatment process one preferred embodiment of brown coal upgrading waste water of the present invention;
Fig. 3 is the structural representation of brown coal upgrading of the present invention system one preferred embodiment;
Fig. 4 is a structure of nozzle sketch map among Fig. 3;
Fig. 5 is the perspective view of the brown coal device for improving quality in the brown coal upgrading system among Fig. 3.
The specific embodiment
Of the present inventionly be contemplated that basically:
The application inventor considers when utilization brown coal upgrading system carries out brown coal upgrading production; The general facilities such as gas generator, burner that are equipped with; Therefore; Utilize the well flammable high water vapor content waste gas that system is produced of organic matter to send into burner, harmful substance is wherein burned down at high temperature (greater than 800 ℃), finally generate free of contamination oxide and steam and realize wastewater treatment; Promptly before waste water produces with regard to the time waste gas that contains hazardous substance handle; Treatment process is more simplified, and combustion process produces a large amount of heat and except that being used for system itself, also can generate electricity, and finally the steam of generation can carry out second use or condensing and recycling can be used for industry and domestic water.
In order to make those skilled in the art understand technical scheme of the present invention better, the present invention is done further detailed description below in conjunction with accompanying drawing and specific embodiment.
Referring to Fig. 1, the treatment process of brown coal upgrading waste water comprises:
High water vapor content waste gas is sent into burner; In burner, carry out high temperature incineration; Then send into the heat-conducting medium inlet of brown coal device for improving quality in company with heat-conducting medium, the high-temperature flue gas that outlet is discharged to brown coal device for improving quality heat-conducting medium comprises the processing of condensation, and the water that obtains is recycled.
Below through concrete embodiment the treatment process of brown coal upgrading waste water of the present invention is described.
Referring to Fig. 2, be the flow chart of treatment process one preferred embodiment of brown coal upgrading waste water of the present invention:
Treatment process in the present embodiment comprises:
The high water vapor content waste gas that brown coal device for improving quality exhaust end is produced is delivered to burner after via the cyclone dust collector dust removal process; In burner, carry out high temperature incineration; And, after the pending brown coal in the brown coal device for improving quality are handled, from the heat-conducting medium outlet of brown coal device for improving quality, discharge in company with in the heat-conducting medium entering brown coal device for improving quality; The high-temperature flue gas of discharging carries out waste heat recovery through the waste heat boiler device; Get into flue gas desulfur device again and make waste gas condensation, gas-liquid separation through spray, the water that obtains after the separation can be recycled, and gas can satisfy qualified discharge.
The waste water that produces in the brown coal upgrading process is by the high water vapor content waste gas that contains heterocyclic compounds such as volatile phenol, polycyclic aromatic hydrocarbon and oxygen, sulphur, nitrogen, a kind of industrial organic waste water of high CODcr, high phenol value, high ammonia nitrogen and the intractable that forms after the process condensation.It is to exist with a kind of high water vapor content waste gas form that contains fuel gas and organic impurities before that these waste water become liquid in condensation; Thereby; In the present embodiment; Utilize the good combustibility of self produced gas and organic impurities that this high water vapor content waste gas is together fed the combustion chamber together with producer gas, the harmful substance in the high water vapor content waste gas is burned down at high temperature (greater than 800 ℃), finally generate water-fast gas and steam; Condensation subsequently and gas-liquid separation can realize the harmless treatment of upgrading waste water.Combustion process produces a large amount of heat and except that being used for system itself, also can generate electricity, and the final steam that generates reclaims and can be used for industry and domestic water.
Use the burning method processing brown coal upgrading waste water of present embodiment to have following advantage:
1, greatly practices thrift the construction investment and the equipment investment of construction waste water processing aspect; With respect to carry out flocculation sediment earlier, once adsorb again, the long flow path that this treatment process produced of second adsorption, equipment are many, the problem in the big pond of needs, the burning method of present embodiment only need increase the burner of brown coal device for improving quality and change some connecting lines;
2, burning method is handled brown coal upgrading waste water; Be before " waste water " forms; Just it is carried out burning disposal; Not only possibly bring the various organic pollution deep oxidations of pollution is free of contamination gas; Steam condensation reuse is subsequently also managed conveying between the device, carrying with a large amount of aqueous waters because as other waste water treatment process, high-temperature vapor is not condensed into aqueous water then throughout, and operating costs such as the power of practicing thrift thus, consumptive material, medicament, manual work are equally very considerable.
Wherein, Air distribution amount when in burner, burning should decide according to oxygen content; Preferably should meet the following conditions: combustible 50%～300% of the oxygen demand of fully burning; In implementation process, can calculate this air distribution amount according to fully burn amount of oxygen and the airborne oxygen content of needs of combustible.Then the air distribution amount is moderate if join air, and then the air distribution amount is little to join pure oxygen, joins then air distribution amount increasing of waste gas.
Below choose demonstration test for the air distribution amount
1, taking by weighing the place of production that 320kg is crushed to suitable particle size is the brown coal raw coal of Huo Linhe, sends into the brown coal device for improving quality, and design temperature is 650 ℃, begins to heat;
2, the high water vapor content waste gas outlet that the brown coal device for improving quality is produced is connected to the self-produced exhaust gas entrance of burner, opens air distribution;
3, when test temperature reaches 650 ℃, send into coal gas to burner producer gas inlet, put coal gas subsequently, and adjustment air distribution amount, observe burner tail gas and go out lip reflex, and record experimental phenomena such as following table:
The experimental phenomena of the different air distribution amounts of table 1
| The air distribution amount | Fire box temperature | The tail gas taste | Tail gas goes out lip reflex |
| Greatly | Low | Smell is dense | Flue gas is navy blue |
| In | Lower | Smell is heavier | It is light blue that flue gas is |
| Little | High | Smell is than hydroxyl | It is colourless that flue gas is |
Can draw as drawing a conclusion from above phenomenon:
Fullest is with stable the most rationally the time in fuel and combustion adjuvant proportioning in burning, and entire test has also embodied this point.When the air distribution amount was big, flue gas was navy blue, explained that burning is insufficient; Organic pollution is discharged with tail gas, and this is because under the constant situation of exhaust gas channel area, the increase of total blast volume makes the tail gas wind speed increase; Therefore tail gas can not get the adequate time burning, under imperfect combustion situation, discharges, and this has also caused the tail gas taste dense; This also can cause the shortage of heat of release simultaneously and the heat taken away increases, and low fire box temperature has also been proved this point.
Then situation is opposite for little air distribution amount; Rational fuel, combustion adjuvant proportioning; Slower air motion speed provides sufficient burning time, thereby makes these organic pollutions inner by fully oxidation at burner, thereby the colourless while taste of tail gas of discharging is lighter.
In the air distribution amount linking link and the evidence of these a series of variations then are provided.
Brown coal upgrading of the present invention system one preferred embodiment
Referring to Fig. 3, Fig. 4, Fig. 5, the brown coal upgrading system of present embodiment comprise 8 brown coal device for improving quality A and with the burner B of the corresponding setting of brown coal device for improving quality.
Wherein, burner B comprises:
Burner B1 with main fuel, high water vapor content waste gas, main fuel combustion air, waste gas combustion air mixing, forms burning condition;
The B2 of wind mixed chamber; Promptly lighting a fire in front end and combustor nozzle joint, but because the gas that burner comes out has certain speed, therefore probably flame occurs in the wind mixed chamber stage casing; Second half section also belongs to burning zone, and aphlogistic leading portion makes 4 kinds of gases of burner ejection as much as possible fully mix basically;
Combustion chamber B3; Because burning produces high temperature; Therefore the inevitable expanded by heating of gas is provided with bigger combustion chamber, space at the wind mixed chamber rear portion, makes burning become more abundant; The a part of high-temperature tail gas (400 ℃) that simultaneously outlet of the heat-conducting medium of brown coal device for improving quality is produced is sneaked into burning back gas (1300 ℃) and is blended together the heat-conducting medium about 700 degree, sends into the brown coal device for improving quality then.Such mixing has following benefit:
1, the waste heat of 400 ℃ of tail gas is able to utilize; 2, the resistance to elevated temperatures of consideration brown coal device for improving quality self is limited, therefore needs to reduce the heat-conducting medium temperature.
Wherein, referring to Fig. 4, burner comprises high water vapor content exhaust gas entrance B11, main fuel inlet B12, main fuel combustion air (be generally air, but also can be oxygen, oxygen depleted exhaust air etc.) inlet B13, waste gas combustion air inlet B14.Wherein, High water vapor content exhaust gas entrance B11 is communicated with exhaust end 53 through jet chimney C; The waste gas that exhaust end is discharged carries out dedusting through cyclone dust collector D earlier, then gets into the high water vapor content exhaust gas entrance B11 of burner, and combustion-supporting air blast E provides combustion air to burner.Because high water vapor content waste gas comes from brown coal; Can take some tiny dust granules unavoidably out of; So before burning, remove these fine dusts particles through cyclone dust collector; This brings benefit can for burner, heat-conducting medium circulating line, otherwise can cause the duct wall dust stratification, reduces the thermal efficiency.Cyclone dust collector receive tiny coal particle can directly send into the pressure ball operation, process production marketing.
High water vapor content waste gas gets in the burner and burns together in company with heat-conducting medium; The final entering in the brown coal device for improving quality; Discharge as high-temperature flue gas from the heat-conducting medium outlet of brown coal device for improving quality to the end, get into flue F, be provided with smoke induced draught fan G in the flue.Flue is communicated with a recycling and processing device, carries out condensation process through recycling and processing device.Wherein, recycling and processing device comprises waste heat boiler device and the flue gas desulfur device that connects successively, and the waste heat boiler device carries out waste heat recovery to high-temperature flue gas, and flue gas desulfur device carries out further condensation to condensed flue gas, realizes gas-liquid separation.
Wherein, the structure of brown coal device for improving quality is referring to Fig. 5, and it comprises: shell 1, be provided with shell 1 top feed hopper 2, be arranged on the discharge bucket 3 of shell 1 below, the heat-conducting mechanism 4 in the shell is set, be arranged on shell 1 exhaust gear 5 at middle part substantially.
Wherein, Heat-conducting mechanism 4 comprise be arranged on derivation house steward feed hopper 2 places, that be used to derive heat-conducting medium, with a plurality of heat-conducting medium importing portion 42 of deriving a plurality of heat-conducting medium leading-out portions 41 that house steward is connected, the importing house steward who is used to import heat-conducting medium who is arranged on discharge bucket 3 places, being connected with the importing house steward; Be connected a plurality of heat pipes 43 between importing portion and the leading-out portion; The heat-conducting medium leading-out portion 41 of heat-conducting medium importing portion 42 and corresponding setting with it and a plurality of heat pipes 43 that are arranged between the two its conducting constitute a heat-conducting unit, and a plurality of heat pipes 43 in each heat-conducting unit are along parallel direction, arrange evenly and at intervals; Form the mobile space of material between the heat pipe.Wherein, longitudinally be provided with a plurality of fins 44 between the heat pipe 43, the vertically downward-sloping certain angle setting of fin 44.Fin in the present embodiment is divided into one-level fin 44a and secondary fin 44b.Wherein, one-level fin 44a longitudinally laterally arranges, and its integral body is arranged in the space between two adjacent heat pipes; Two whole with adjacent heat pipes are connected; Its bottom is arranged on to tilting away from the direction of exhaust passage, blocking on the exhaust passage near the exhaust outlet on the wall of heat pipe 54, makes gas under the effect of internal negative pressure, discharge from exhaust outlet 54; And solid material is retained in the shell under the stopping of fin; Thereby the one-level fin 44a that is provided with, it mainly acts on is to be beneficial to exhaust, also can play certain stirring effect certainly.The set-up mode of one-level fin in the present embodiment, the feasible one-level fin that is in sustained height, per four form the up big and down small infundibulate blanking spaces of a bore; When material falls, concentrate earlier, then diffusion; Spread again and come during again to the fin of next height, thereby nationality realizes dynamic stirring by fin, made heat to transmit equably; Make in the shell material everywhere all can under suitable temperature, be processed, can make the fat coal product.As shown in Figure 5; In the present embodiment; The upper end of secondary fin 44b is connected with adjacent a pair of heat pipe, and the bottom extend out to this to outside the space between the adjacent heat pipe, promptly stretches into this in the blanking space between heat pipe and contiguous these four heat pipes of a pair of heat pipe; Also be provided with secondary fin 44b between the contiguous a pair of heat pipe, the lower end of this secondary fin 44b is also departed from vertical direction and is stretched in this blanking space.The main effect of secondary fin 44b is to strengthen stirring and heat conduction; The heat that makes heat pipe send can be delivered between the heat pipe the blanking space everywhere; The blanking space temperature of charge everywhere that is between the heat pipe is tending towards identical, and the gas that in being heated process, produces of material can be discharged quickly everywhere.
Wherein, also be provided with a plurality of fins between the heat-conducting medium importing portion, make material also can stirred, conduct heat when arriving the space between the heat-conducting medium importing portion, the gas that this place is produced can in time be discharged, and keeps the heat transmission even simultaneously.
Brown coal device for improving quality in the present embodiment also comprises temperature control device, is arranged on the feed hopper place, and it comprises:
The temperature sensor (not shown) is obtained the temperature signal at each heat-conducting medium leading-out portion place;
Controller compares temperature signal and preset temperature value, sends temperature control instruction according to comparative result;
Be arranged on the control valve 7 in the leading-out portion of each heat-conducting unit, regulate aperture according to temperature control instruction.
This temperature control device is set, can in time regulates and control temperature everywhere in each shell, make it to reach unanimity, all consistent with the temperature of setting, thus assurance finally obtains the product of expecting.
Wherein, heat-conducting medium leading-out portion 41 integral body are directly tabular, and its top has certain gradient, are the pinnacle shape, and this kind set-up mode can be so that blanking be more smooth and easy.
Wherein, the integral body of heat-conducting medium importing portion 42 is directly tabular, and its top also has certain gradient, for the pinnacle shape, makes things convenient for blanking.
In the present embodiment; Only be provided with this two-stage exhaust passage of exhaust passage, center and peripheral exhaust passage, in actual implementation process, according to what of the heat pipe that is provided with; Outside by the shell center; More multistage exhaust passage can be set, make the gas that produces in the heating process in time to discharge, not influence the upgrading effect.
In the present embodiment; Each parts are all towards helping blanking, helping exhaust Target Setting smoothly; Thereby make in the process of handling coal, can make the material temperature everywhere that is in the blanking space by control effectively flexibly, with the treatment effect of realizing.In the present embodiment, heat-conducting medium adopts hot gas.
Brown coal device for improving quality in the brown coal upgrading of the present invention system is not limited to aforementioned structure, in other embodiments, can select for use any employing heat-conducting medium to carry out the brown coal device for improving quality of upgrading.
Content waste gas steams owing to utilized high temperature incineration to handle high water in brown coal upgrading system in the present embodiment, and the high water vapor content waste gas that is about to produce in the upgrading process is sent in the combustion chamber and burned; These steam that are contained in the high water vapor content waste gas are further heated in the gas of back entering as heat-conducting medium (650 ℃); Since the high specific heat capacity of steam, and then increased the heat that the unit heat-conducting medium is contained, and the while is owing to steam sneaking into; Make the heat transfer efficiency between heat-conducting medium and the brown coal increase; So, both increase total amount of heat, strengthened the transmission of heat again; Make the effect of brown coal upgrading system of present embodiment itself be greatly improved, these liftings can be embodied in decline or the increase of single device treating capacity or the lifting of the quality of product own of energy consumption of unit product.
More than the present invention has been carried out detailed introduction, use concrete example in the literary composition principle of the present invention and embodiment set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof.Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention, can also carry out some improvement and modification to the present invention, these improvement and modification also fall in the protection domain of claim of the present invention.
Claims (22)
1. the treatment process of a brown coal upgrading waste water is characterized in that, comprising: the high water vapor content waste gas that produces in the brown coal upgrading process is delivered in the burner burned, then send into the heat-conducting medium inlet of brown coal device for improving quality in company with heat-conducting medium.
2. the treatment process of brown coal upgrading waste water as claimed in claim 1 is characterized in that, also comprises the steps: the high-temperature flue gas that the heat-conducting medium outlet of brown coal device for improving quality is discharged is comprised the processing of condensation, and the water that obtains is recycled.
3. the treatment process of brown coal upgrading waste water as claimed in claim 1 is characterized in that, said burner is to be arranged on the burner that is used for providing to the brown coal device for improving quality heat-conducting medium feeding mechanism of heat-conducting medium.
4. the treatment process of brown coal upgrading waste water as claimed in claim 1 is characterized in that, the high-temperature flue gas that the heat-conducting medium outlet of brown coal device for improving quality is discharged carries out carrying out condensation again or in waste heat recovery, carrying out condensation after the waste heat recovery.
5. the treatment process of brown coal upgrading waste water as claimed in claim 4 is characterized in that, the waste gas that obtains after the condensation is comprised again the harmless treatment of desulfurization, denitration.
6. the treatment process of brown coal upgrading waste water as claimed in claim 1 is characterized in that, delivers in the burner at high water vapor content waste gas and carries out dust removal process earlier before the burning.
7. the treatment process of brown coal upgrading waste water as claimed in claim 1 is characterized in that, the air distribution amount during burning is combustible 50%～300% of the oxygen demand of fully burning.
8. the treatment process of brown coal upgrading waste water as claimed in claim 1 is characterized in that, the air distribution amount during burning is combustible 120% of the oxygen demand of fully burning.
9. the treatment process of brown coal upgrading waste water as claimed in claim 1 is characterized in that, the ignition temperature during burning is controlled at 800 ℃～1600 ℃.
10. the treatment process of brown coal upgrading waste water as claimed in claim 1 is characterized in that, the ignition temperature during burning is controlled at 900 ℃～1200 ℃.
11. a brown coal upgrading system comprises:
The brown coal device for improving quality is provided with the heat-conducting medium import;
The heat-conducting medium feeding mechanism is connected with said heat-conducting medium import, carries heat-conducting medium to said brown coal device for improving quality;
It is characterized in that the exhaust end of said brown coal device for improving quality is communicated with said heat-conducting medium feeding mechanism, the burner that the high water vapor content waste gas that exhaust end is discharged is fed through in the heat-conducting medium feeding mechanism burns.
12. brown coal upgrading as claimed in claim 11 system is characterized in that, also comprises a recycling and processing device, with the heat-conducting medium outlet conducting of brown coal device for improving quality, the high-temperature flue gas that outlet is discharged to heat-conducting medium comprises the processing of condensation.
13. brown coal upgrading as claimed in claim 12 system; It is characterized in that the high-temperature flue gas that said recycling and processing device is discharged the heat-conducting medium outlet of brown coal device for improving quality carries out carrying out condensation process again or in waste heat recovery, carrying out condensation process after the waste heat recovery.
14. brown coal upgrading as claimed in claim 13 system is characterized in that, the waste gas that recycling and processing device obtains after to condensation comprises the harmless treatment of desulfurization, denitration again.
15. brown coal upgrading as claimed in claim 12 system; It is characterized in that; Said recycling and processing device comprises waste heat boiler device and the flue gas desulfur device that connects successively; Said waste heat boiler device carries out condensation to high-temperature flue gas, and said flue gas desulfur device carries out gas pollutant to condensed flue gas to be handled.
16. brown coal upgrading as claimed in claim 11 system; It is characterized in that; Also comprise a dust arrester; The import of said dust arrester is connected with the exhaust end of said brown coal device for improving quality, and the outlet of said dust arrester is communicated with burner, carries out dust removal process earlier before high water vapor content waste gas is burned in delivering to burner.
17. brown coal upgrading as claimed in claim 16 system is characterized in that said dust arrester is a cyclone dust collector.
18. brown coal upgrading as claimed in claim 11 system is characterized in that, said burner comprises burner, wind mixed chamber, the combustion chamber that is communicated with successively.
19. brown coal upgrading as claimed in claim 18 system is characterized in that the volume of said burner is less than wind mixed chamber, the volume of said wind mixed chamber is less than the combustion chamber.
20. brown coal upgrading as claimed in claim 18 system; It is characterized in that; Said burner comprises main fuel inlet, main fuel combustion air inlet, high water vapor content exhaust gas entrance; Waste gas combustion air inlet, wherein, said high water vapor content exhaust gas entrance is communicated with the exhaust end of said brown coal device for improving quality.
21. brown coal upgrading as claimed in claim 16 system; It is characterized in that; Said burner comprises burner, wind mixed chamber, the combustion chamber that is communicated with successively, and said burner comprises main fuel inlet, main fuel combustion air inlet, high water vapor content exhaust gas entrance, waste gas combustion air inlet; Wherein, said high water vapor content exhaust gas entrance is connected with the outlet of dust arrester.
22. brown coal upgrading as claimed in claim 11 system; It is characterized in that; Said brown coal device for improving quality comprises shell, is separately positioned on feed end, the discharge end at shell two ends; Be provided with two-stage exhaust passage at least from inside to outside from the shell center, said exhaust passage be arranged on the exhaust end conducting on the shell; In the cavity of said shell between feed end and discharge end, be provided with heat-conducting mechanism; Said heat-conducting mechanism is being provided with the heat-conducting medium import near the discharge end place, is being provided with the heat-conducting medium outlet near the feed end place, and said heat-conducting mechanism comprises many groups heat-conducting unit spaced apart; Said heat-conducting unit comprises a plurality of heat pipes; Said heat pipe and heat-conducting medium import and heat-conducting medium outlet conducting longitudinally are provided with a plurality of fins downward-sloping with vertical direction, the fin that is provided with between the heat pipe on side, exhaust passage between the adjacent heat pipe; The bottom tilts to the direction away from the exhaust passage, shelters from the exhaust outlet of offering on the wall of exhaust passage.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
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| CN201110281934.3A CN102506575B (en) | 2011-09-21 | 2011-09-21 | Treatment process for lignite upgrading waste water and lignite upgrading system |
| PCT/CN2012/077184 WO2013040919A1 (en) | 2011-09-21 | 2012-06-20 | Treatment process for lignite upgrading waste water and lignite upgrading system |
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| CN201110281934.3A CN102506575B (en) | 2011-09-21 | 2011-09-21 | Treatment process for lignite upgrading waste water and lignite upgrading system |
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| CN102506575B CN102506575B (en) | 2014-06-18 |
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| WO (1) | WO2013040919A1 (en) |
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| CN103896444A (en) * | 2012-12-27 | 2014-07-02 | 南京海益环保工程有限公司 | Technology and system for processing wastewater generated during brown coal upgrading process |
| CN104178192A (en) * | 2014-08-18 | 2014-12-03 | 千秋能源（上海）有限公司 | Lignite upgrading treatment combination mechanism |
| CN113413740A (en) * | 2021-06-30 | 2021-09-21 | 福建省利邦环境工程有限公司 | Plastic regeneration waste gas purification treatment device and working method thereof |
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Also Published As
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| CN102506575B (en) | 2014-06-18 |
| WO2013040919A1 (en) | 2013-03-28 |
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