CN106322423A - Clean and environment-friendly coal combusting method - Google Patents

Clean and environment-friendly coal combusting method Download PDF

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Publication number
CN106322423A
CN106322423A CN201610777929.4A CN201610777929A CN106322423A CN 106322423 A CN106322423 A CN 106322423A CN 201610777929 A CN201610777929 A CN 201610777929A CN 106322423 A CN106322423 A CN 106322423A
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China
Prior art keywords
flue gas
mixture
mixed
polylactic acid
desulfurizing agent
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CN201610777929.4A
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Chinese (zh)
Inventor
林发绍
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温州乐享科技信息有限公司
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Priority to CN201610777929.4A priority Critical patent/CN106322423A/en
Publication of CN106322423A publication Critical patent/CN106322423A/en

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation 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
    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/46Removing components of defined structure
    • B01D53/48Sulfur compounds
    • B01D53/50Sulfur oxides
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation 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
    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/74General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/81Solid phase processes
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23JREMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00Arrangements of devices for treating smoke or fumes
    • F23J15/02Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23KFEEDING FUEL TO COMBUSTION APPARATUS
    • F23K1/00Preparation of lump or pulverulent fuel in readiness for delivery to combustion apparatus
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2258/00Sources of waste gases
    • B01D2258/02Other waste gases
    • B01D2258/0283Flue gases
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23JREMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J2215/00Preventing emissions
    • F23J2215/20Sulfur; Compounds thereof
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23KFEEDING FUEL TO COMBUSTION APPARATUS
    • F23K2201/00Pretreatment of solid fuel
    • F23K2201/50Blending
    • F23K2201/505Blending with additives

Abstract

The invention belongs to the field of energy, and relates to a clean and environment-friendly coal combusting method. The method comprises the steps that coal, sodium silicate and calcium oxide are mixed and combusted; gas containing oxygen is mixed with a desulfurizing agent to form a mixture; smoke generated through combustion makes contact with the mixture at the temperature ranging from 100 DEG C to 220 DEG C, and smoke is subject to dust removal. The desulfurizing agent preparing method comprises the steps that a soluble ferric salt solution and polylactic acid are mixed; a urea solution is added into the mixture, and a sodium bicarbonate solution is slowly added until the pH value ranges from 6.8 to 7.5; materials react for one hour to three hours under the condition that the temperature ranges from 130 DEG C to 160 DEG C, and the pressure ranges from 0.10 MPa to 0.20 MPa; sediment particles obtained through sedimentation, a bonding agent and a pore forming agent are mixed and dried, and roasting is carried out in the oxygen atmosphere; an obtained roasting object is placed in the polylactic acid at the temperature ranging from 160 DEG C to 200 DEG C to be subject to constant-temperature impregnation, and drying and cooling are carried out. The method is low in flue contamination degree, small in dust stratification amount, high in smoke desulfurizing efficiency and more clean and environment-friendly.

Description

The coal combustion process of clean environment firendly
Technical field
The invention belongs to energy field, be specifically related to the coal combustion process of a kind of clean environment firendly.
Background technology
Being often accompanied by flue surface in coal combustion process and stain serious, the problem of a large amount of dust stratification of flue, this fires to boiler etc. Cleaning and the maintenance work of burning equipment bring difficulty.Further, often containing sulfide in the flue gas that coal combustion produces.Sulfuration owner The sulfur material that coal to be derived from or the raw material of industry contain, sulfur material reacts in combustion process or industrial manufacturing process, Change into sulfide to discharge.Sulfide particularly hydrogen sulfide, sulfur dioxide etc. can frequently result in the catalysis produced in workshop section Agent poisoning and deactivation, and the waste gas of sulfur compound directly discharges, and easily pollutes environment, produces the air problem such as haze, serious shadow Ring the health of the mankind.
Desulfurizing agent is a kind of medicament for removing sulfide in flue gas.Be conducive to industry raw owing to reducing sulfide content Producing and environmental conservation, therefore researcher gives more concern for the research and development of desulfurizing agent.Current desulfurizing agent kind includes Solid base/liquid base desulfurizing agent, activated carbon desulphurization agent, molecular sieve carried metal desulfurization agent, Fe-series desulfurizing agent, manganese systems desulfurizing agent, Many composite oxide of metal desulfurizing agent etc..Studying through for many years, although desulfurizing agent kind is more and more abundanter, desulfurization performance there has also been Be greatly improved, but the Sulfur capacity of existing desulfurizing agent and desulfurization precision be the most relatively low, it is difficult to meet flue gas desulfurization to efficiency and The requirement of economy.
One of still needing at present coal combustion process economic, efficient, to solve in coal-fired process, flue stains, a large amount of dust stratification is asked Topic, and disclosure satisfy that industry, the civil area urgent needs to flue gas desulfurization.
Summary of the invention
The inventors found that the coal combustion process of a kind of clean environment firendly, the method is by coal and waterglass, calcium oxide Burn after mixing, reduce flue and stain and dust stratification degree;The method of the present invention uses high sulfur capacity, high desulfurization precision, height Crushing strength and the desulfurizing agent of bigger serface, carry out desulfurization to flue gas, substantially increase desulfuration efficiency.The fire coal of the present invention Method clean environment firendly and economical and practical.Further, the mixture of oxygen-containing gas and desulfurizing agent at high temperature carries out desulfurization to flue gas Desulfuration efficiency is higher.
The present invention relates to the coal combustion process of a kind of clean environment firendly, comprise the steps,
1) coal, waterglass and calcium oxide are mixed, and burn;
2) by oxygen-containing gas and desulphurizer mixing, mixture is obtained;
3) by step 1) flue gas that produces of burning and step 2) mixture contact at 100-220 DEG C, then flue gas is entered Row dedusting;Preferably, described flue gas and mixture 100-150 DEG C, 130-180 DEG C, 160-200 DEG C, 100 DEG C, 120 DEG C, 130 DEG C, 150 DEG C, 170 DEG C, contact at 180 DEG C or 200 DEG C;
Wherein, the preparation method of described desulfurizing agent comprises the steps:
(1) soluble iron saline solution and polylactic acid are mixed;In mixture, add urea liquid, be slow added into carbonic acid Hydrogen sodium solution also mixes, until pH value reaches 6.8-7.5 (preferable ph is 7-7.5,7 or 7.5);Preferably, it is slowly added to Mode is for dropwise to instill;
(2) material that step (1) is obtained 130-160 DEG C, react 1-3 hour under the conditions of 0.10-0.20MPa, sedimentation It is precipitated granule;Preferably, 140-150 DEG C, react 3 hours under 0.10-0.12MPa;Preferably, subsidence style is for standing Sedimentation;
(3) described precipitation granule is mixed with binding agent, pore creating material, dries, then roasting in oxygen-containing atmosphere;
(4) calcining matter that step (3) obtains is put into constant temperature dipping in the polylactic acid of 160-200 DEG C, then dries, cool down i.e. Can;Preferably calcining matter is put into 160-180 DEG C, 160 DEG C, 165 DEG C, 170 DEG C, 175 DEG C, 180 DEG C, 185 DEG C, 190 DEG C, 195 DEG C Or constant temperature dipping in the polylactic acid of 200 DEG C.
In the course of reaction of step (2), polylactic acid is fused into precipitation granule with the FeOOH granule of generation.Step (4), in, dipping makes polylactic acid and FeOOH granule carry out depth integration.
In the embodiment of any one of the present invention, step 1) in, the weight ratio of coal, waterglass and calcium oxide is (80- 100): (2-9): (1-5);It is preferably 80:2:9,100:9:5,90:3:1 or (90-100): (2-6): (1-3).
In the embodiment of any one of the present invention, step 1) in ignition temperature≤1500 DEG C, it is preferable that≤1200 DEG C ,≤ 1000 DEG C or≤800 DEG C, more preferably 500 DEG C, 700 DEG C, 800 DEG C, 900 DEG C, 1000 DEG C, 1100 DEG C, 1200 DEG C or 1500 DEG C.
In the embodiment of any one of the present invention, step 1) burning carry out in the boiler.
In the embodiment of any one of the present invention, step 2) in, the consumption of described oxygen-containing gas is 1-3m3/ (kg desulfurization Agent);It is preferably 1-2m3/ (kg desulfurizing agent), 1m3/ (kg desulfurizing agent), 1.5m3/ (kg desulfurizing agent), 2m3/ (kg desulfurizing agent) or 3m3/ (kg desulfurizing agent).
In the embodiment of any one of the present invention, step 2) oxygen-containing gas selected from nitrogen and the gaseous mixture of oxygen, oxygen With air;Preferably in gaseous mixture, the volume ratio of nitrogen and oxygen is (1-10): 1, more preferably 1:1,4:1,6:1,8:1 or 10: 1。
In the embodiment of any one of the present invention, step 3) in, described flue gas (in terms of sulfur dioxide in flue gas) is with described In mixture, the weight ratio of desulfurizing agent is 1:(1-20);Be preferably 1:(2-10), 1:(5-15), 1:1,1:8,1:10,1:15,1: 17 or 1:20.
In the embodiment of any one of the present invention, step 3) in, the water content of described flue gas is 5%-20% (w/w);Excellent Elect 8%-15% (w/w), 5% (w/w), 7% (w/w), 10% (w/w), 14% (w/w), 17% (w/w) or 20% (w/w) as.
In the embodiment of any one of the present invention, step 3) in, the time of contact is 20 minutes-1.5 hours;It is preferably 20-30 minute, 30 minutes, 40 minutes, 60 minutes or 90 minutes.
In the embodiment of any one of the present invention, step 3) in, described flue gas and mixture in desulfurizing tower along phase negative side To flowing and contacting.
In the embodiment of any one of the present invention, step 3) in, the flue gas that burning is produced by air-introduced machine introduces in desulfurizing tower Carry out desulfurization.
In the embodiment of any one of the present invention, step 3) in, flue gas is introduced cleaner unit and carries out dedusting.
In the embodiment of any one of the present invention, in step (4), the temperature of constant temperature dipping is the temperature of polylactic acid in step (4) Degree.
In the embodiment of any one of the present invention, described soluble iron saline solution is soluble iron saline solution.
In the embodiment of any one of the present invention, the addition of described soluble iron saline solution is that 100-200 weight portion is (excellent Elect 100,140,160,200 weight portions as), the addition of polylactic acid described in step (1) be 7-15 weight portion (preferably 7,9, 13,15 weight portion).
In the embodiment of any one of the present invention, the weight percentage of soluble ferric iron salt in described soluble iron saline solution For 40-60% (preferably 40%, 50% or 60%);Preferably, any in ferric nitrate and iron chloride of soluble ferric iron salt One or more.
In the embodiment of any one of the present invention, described in step (1), the particle diameter of polylactic acid is 200-800 μm, is preferably 200-500 μm, 200 μm, 300 μm, 400 μm, 500 μm, 700 μm or 800 μm.The polylactic acid of this particle size range is more easy to and generates FeOOH granule merges.
In the embodiment of any one of the present invention, described urea liquid is aqueous solution of urea.
In the embodiment of any one of the present invention, the molar concentration of described urea liquid is 0.01-1mol/L, is preferably 0.01-0.2mol/L, 0.1mol/L, 0.2mol/L, 0.4mol/L, 0.7mol/L, 0.8mol/L or 1mol/L.
In the embodiment of any one of the present invention, described sodium bicarbonate solution is sodium bicarbonate aqueous solution.
In the embodiment of any one of the present invention, the molar concentration of described sodium bicarbonate solution is 0.1-0.5mol/L, excellent Elect 0.1-0.3mol/L, 0.1mol/L, 0.2mol/L, 0.3mol/L, 0.4mol/L or 0.5mol/L as.
In the embodiment of any one of the present invention, the addition of described urea liquid is 6-13 weight portion, preferably 6-10 Weight portion, 6-8 weight portion, 6 weight portions, 7 weight portions, 8 weight portions, 9 weight portions, 10 weight portions, 10.5 weight portions, 11 weight Part, 12 weight portions or 13 weight portions.
In the embodiment of any one of the present invention, the drying temperature in step (3) and/or step (4) is 160-180 DEG C, Preferably, the drying temperature in step (3) and/or step (4) is 160 DEG C, 165 DEG C, 170 DEG C, 175 DEG C, 180 DEG C or 185 DEG C.
The purpose dried in step (3) and/or step (4) is to reduce water content, and moisture mostlys come from raw material.
In the embodiment of any one of the present invention, the sintering temperature in step (3) is 200-250 DEG C;Preferably 200 DEG C, 210 DEG C, 220 DEG C, 225 DEG C, 230 DEG C, 240 DEG C or 250 DEG C.
In the embodiment of any one of the present invention, roasting time is 0.5-2 hour, preferably 0.5,1,1.5 or 2 hours.
In the embodiment of any one of the present invention, the addition of the described polylactic acid in step (4) is 20-50 weight portion; It is preferably 30-45 weight portion, 20 weight portions, 30 weight portions, 40 weight portions, 45 weight portions or 50 weight portions.
In the embodiment of any one of the present invention, dip time is 8-12 hour;It is preferably 8 hours, 10 hours or 12 little Time.
In the embodiment of any one of the present invention, the addition of described binding agent is 5-10 weight portion, preferably 5-8 weight Part, 5 weight portions, 6 weight portions, 7 weight portions, 8 weight portions, 9 weight portions or 10 weight portions;The addition of described pore creating material is 1-3 Weight portion, preferably 1 weight portion, 2 weight portions or 3 weight portions.
In the embodiment of any one of the present invention, it is any that described binding agent is selected from bentonite, kieselguhr and Kaolin One or more.
In the embodiment of any one of the present invention, described pore creating material in wood dust and graphite powder any one or many Kind.
In the embodiment of any one of the present invention, oxygen-containing atmosphere is oxygen and the gaseous mixture of nitrogen or air;Preferably, mixed Closing in gas, oxygen is (1-9) with the volume ratio of nitrogen: (9-1), more preferably (2-8): (8-2), 2:8,3:7,4:6 or 5:5.
In the embodiment of any one of the present invention, the number-average molecular weight of polylactic acid described in step (1) and/or step (4) Mn is 1 × 105~2 × 105;Preferably, number-average molecular weight Mn of polylactic acid described in step (1) and/or step (4) be 1 × 105、1.5×105Or 2 × 105
In the present invention,
Waterglass refers to water-soluble metasilicate salt, and its chemical formula is Na2SiO3·9H2O。
The beneficial effect that the present invention obtains:
1, the coal combustion process of the present invention, burns after being mixed with waterglass, calcium oxide by coal, reduces the contamination of flue Degree, decreases dust deposit in flue, more clean environment firendly.
2, in the coal combustion process of the present invention, the mixture of oxygen-containing gas and desulfurizing agent at high temperature carries out desulfurization to flue gas Desulfuration efficiency is higher.
3, the coal combustion process of the present invention, uses the Sulfur capacity height of desulfurizing agent, desulfurization precision height, crushing strength height, specific surface Long-pending big, thus improve efficiency and the economy of flue gas desulfurization.
4, the coal combustion process of the present invention, the desulfurizing agent of use, using polylactic acid as preparing one of raw material, improves desulfurizing agent Performance.
Detailed description of the invention
In order to make present disclosure be more likely to be clearly understood, below in conjunction with the specific embodiment of the present invention to this Bright it is described in further detail, but specific embodiment itself does not cause limiting the scope of the invention.
Embodiment 1 prepares desulfurizing agent 1
1000g, the ferric chloride solution of 60% (w/w) and 70g polylactic acid being mixed, the particle diameter of polylactic acid is 200-400 μm, Number-average molecular weight Mn is 1 × 105~1.2 × 105.The urea liquid of addition 60g, 0.8mol/L in mixture, more dropwise Instill 0.1mol/L sodium bicarbonate solution and stir, until solution ph reaches 6.8.The material obtained is put in reactor, 140-150 DEG C, react 3 hours under the conditions of 0.10-0.12MPa, standing sedimentation is precipitated granule.By isolated precipitation Grain is mixed homogeneously with 50g bentonite, 10g wood dust, dries at 170-180 DEG C, then in 200-210 DEG C of roasting in air atmosphere Burn 2 hours, obtain calcining matter.The calcining matter obtained is put into constant temperature in the liquid polylactic acid of 160-170 DEG C impregnate 8 hours, then Drying at 175-185 DEG C, cooling obtains desulfurizing agent 1.
Embodiment 2 prepares desulfurizing agent 2
1600g, the iron nitrate solution of 50% (w/w) and 130g polylactic acid being mixed, the particle diameter of polylactic acid is 500-700 μ M, number-average molecular weight Mn is 1.5 × 105~2 × 105.The urea liquid of addition 100g, 0.2mol/L in mixture, more slowly Dropwise instill 0.4mol/L sodium bicarbonate solution and stir, until solution ph reaches 7.The material obtained is put into reactor In, 140-150 DEG C, react 3 hours under the conditions of 0.10-0.12MPa, standing sedimentation is precipitated granule.By isolated heavy Shallow lake granule is mixed homogeneously with 70g kieselguhr, 20g wood dust, dries at 170-180 DEG C, then in 230-240 in air atmosphere DEG C roasting 2 hours, obtains calcining matter.The calcining matter obtained is put into constant temperature in the liquid polylactic acid of 160-165 DEG C, and to impregnate 12 little Time, then dry at 175-185 DEG C, cooling obtains desulfurizing agent 2.
Embodiment 3 prepares desulfurizing agent 3
2000g, the ferric chloride solution of 40% (w/w) and 150g polylactic acid being mixed, the particle diameter of polylactic acid is 700-800 μ M, number-average molecular weight Mn is 1.5 × 105~2 × 105.The urea liquid of addition 130g, 0.05mol/L in mixture, more slowly Dropwise instill 0.5mol/L sodium bicarbonate solution and stir, until solution ph reaches 7.5.The material obtained is put into reactor In, 140-150 DEG C, react 3 hours under 0.10-0.12MPa, standing sedimentation is precipitated granule.By isolated precipitation Grain is mixed homogeneously with 100g kieselguhr, 30g wood dust, dries at 170-180 DEG C, then in 240-250 DEG C in air atmosphere Roasting 2 hours, obtains calcining matter.The calcining matter obtained is put into constant temperature in the liquid polylactic acid of 160-170 DEG C impregnate 8 hours, Drying at 175-185 DEG C, cooling obtains desulfurizing agent 3 again.
The coal combustion process I of embodiment 4 present invention
10kg coal dust, 0.25kg waterglass and 1.125kg calcium oxide mix homogeneously are sent into boiler, and at 800-1100 DEG C Lower burning 48 hours.The flue gas producing burning carries out damping, and then determining the content of sulfur dioxide in flue gas is 2000mg/ L, water content 5% (w/w).200g desulfurizing agent 1 is mixed mutually with 600L air, forms mixture.By mixture by desulfurizing tower The feeding mouth in portion sprays in desulfurizing tower, is passed through in the air inlet bottom desulfurizing tower by the 10L flue gas after damping, the temperature in desulfurizing tower Degree is maintained at 100-130 DEG C, and flue gas flows in opposite direction in desulfurizing tower with mixture and keeps contacting 30 minutes, by tower top After gas outlet is drawn flue gas and sent into cleaner unit dedusting, collect to obtain gas 1.
The coal combustion process II of embodiment 5 present invention
10kg coal dust, 0.9kg waterglass and 0.5kg calcium oxide mix homogeneously are sent into boiler, and fires at 700-900 DEG C Burn 48 hours.The flue gas producing burning carries out damping, then determines the content of sulfur dioxide in flue gas and is 2500mg/L, contains The water yield 6% (w/w).The gaseous mixture (nitrogen, volume ratio 4:1 of oxygen) of 200g desulfurizing agent 2 with 400L nitrogen and oxygen is mixed mutually Close, form mixture.Mixing logistics is sprayed in desulfurizing tower by the feeding mouth on desulfurizing tower top, the 10L flue gas after damping is led to Entering in the air inlet bottom desulfurizing tower, the temperature in desulfurizing tower is maintained at 150-170 DEG C, flue gas and mixture edge in desulfurizing tower Rightabout flows and keeps contacting 40 minutes, tower top gas outlet draw flue gas and send in cleaner unit after dedusting, collecting Gas 2.
The coal combustion process III of embodiment 6 present invention
10kg coal dust, 0.34kg waterglass and 0.12kg calcium oxide mix homogeneously are sent into boiler, and at 1200-1500 DEG C Lower burning 48 hours.The flue gas producing burning carries out damping, and then determining the content of sulfur dioxide in flue gas is 1500mg/ L, water content 8% (w/w).300g desulfurizing agent 3 is mixed mutually with 300L air, forms mixture.By mixture by desulfurizing tower The feeding mouth in portion sprays in desulfurizing tower, is passed through in the air inlet bottom desulfurizing tower by the 10L flue gas after damping, the temperature in desulfurizing tower Degree is maintained at 190-220 DEG C, and flue gas flows in opposite direction in desulfurizing tower with mixing logistics and keeps contacting 60 minutes, by tower Eject QI KOU to draw flue gas and send in cleaner unit after dedusting, collect to obtain gas 3.
Comparative example 1 prepares desulfurizing agent A
To 1000g, 60% (w/w) ferric chloride solution in add the urea liquid of 60g, 0.8mol/L and mix mutually, then delay Slow dropwise instillation 0.1mol/L sodium bicarbonate solution also stirs, until solution ph reaches 6.8.The material obtained is put into reaction In still, 140-150 DEG C, react 3 hours under the conditions of 0.10-0.12MPa, standing sedimentation is precipitated granule.By isolated Precipitation granule is mixed homogeneously with 50g bentonite, 10g wood dust, dries at 170-180 DEG C, then in 200-in air atmosphere 210 DEG C of roastings 2 hours, cooling obtains desulfurizing agent A.
Comparative example 2
10kg coal dust, 0.25kg waterglass and 1.125kg calcium oxide mix homogeneously are sent into boiler, and at 800-1100 DEG C Lower burning 48 hours.The flue gas producing burning carries out damping, and then determining the content of sulfur dioxide in flue gas is 2000mg/ L, water content 5% (w/w).200g desulfurizing agent A and 600L air is mixed mutually, forms mixture.By mixture by desulfurizing tower The feeding mouth in portion sprays in desulfurizing tower, is passed through in the air inlet bottom desulfurizing tower by the 10L flue gas after damping, the temperature in desulfurizing tower Degree is maintained at 100-130 DEG C, and flue gas flows in opposite direction in desulfurizing tower with mixture and keeps contacting 30 minutes, by tower top After gas outlet is drawn flue gas and sent into cleaner unit dedusting, collect to obtain gas A.
Comparative example 3
10kg coal dust, 0.25kg waterglass and 1.125kg calcium oxide mix homogeneously are sent into boiler, and at 800-1100 DEG C Lower burning 48 hours.The flue gas producing burning carries out damping, and then determining the content of sulfur dioxide in flue gas is 2000mg/ L, water content 5% (w/w).10L flue gas is passed through in the air inlet bottom desulfurizing tower, the desulfurizing agent 1 of embodiment 1 is sent into simultaneously In the desulfurizing agent entrance on desulfurizing tower top, the temperature in desulfurizing tower is maintained at 25-28 DEG C, and flue gas and desulfurizing agent are inverse in desulfurizing tower Carry out mixing and keep to contact 30 minutes to flowing, tower top gas outlet after drawing dedusting, collect to obtain gas B.
Comparative example 4
10kg coal dust is sent into boiler, and burns 48 hours at 800-1100 DEG C.
Experimental example 1 desulfurization precision
Arranging unstripped gas is the nitrogen containing 5000ppmH2S, each 3g of desulfurizing agent 1-3, A of Example 1-3 and comparative example, At normal pressure (usually 1 atmospheric pressure), carrying out repeatedly desulfurization test between 10-45 DEG C respectively, gas air speed is 2000h-1
Finally recording: under each temperature conditions, unstripped gas is after desulfurizing agent 1-3 processes, and outlet total sulfur is below 0.01ppm;Unstripped gas is after desulfurizing agent A processes, and outlet total sulfur is about 0.08ppm.Therefore, the desulfurizing agent 1-3's of the present invention is de- Sulfur precision is higher than desulfurizing agent A.
Experimental example 2 Sulfur capacity
Desulfurizing agent 1-3, A of Example 1-3 and comparative example make sample, measure Sulfur capacity respectively.Take sample 100g, 10 DEG C-45 DEG C, under normal pressure (usually 1 atmospheric pressure), evaluate and test with containing the Standard Gases that H2S is 40000ppm.Qualitative detection, can be certainly Join silver nitrate solution outlet sulfur is detected;Detection by quantitative, can use domestic WK-2C comprehensive Microcoulomb instrument (Jiangsu electroanalysis Instrument plant) detect, the detection limit of this instrument is 0.2ppm, and result is as shown in table 1.
Table 1
Test event Desulfurizing agent 1 Desulfurizing agent 2 Desulfurizing agent 3 Desulfurizing agent A
Sulfur capacity 79.1% 78.3% 80.7% 47.8%
Visible, the Sulfur capacity of the desulfurizing agent 1-3 that the inventive method obtains is far longer than desulfurizing agent A.
Experimental example 3 physical property
After measured, the crushing strength of inventive desulfurization agent 1-3 is more than 110N/cm, and specific surface area is 91-138m2/g;De- The crushing strength of sulfur agent A is 57N/cm, and specific surface area is 52-76m2/g.The desulfurizing agent 1-3's that the inventive method obtains is anti-broken Broken intensity and specific surface area are above desulfurizing agent A.
Experimental example 4 desulfuration efficiency
Dioxy in gas 1-3, the cumulative volume of gas A-B and each gas that mensuration embodiment 4-6 and comparative example 2-3 are collected Change the content of sulfur, and calculate desulfuration efficiency according to the following formula, the results are shown in Table 2.
Desulfuration efficiency=100% × (V0×C0-V×C)/(V0×C0×t)
Wherein:
V is the cumulative volume (L) collecting the gas obtained;
C is to collect content of sulfur dioxide (mg/L) in the gas obtained;
V0Cumulative volume (L) for flue gas;
C0For sulfur dioxide in flue gas content (mg/L);
T is desulfurization time (h).
Table 2
As shown in Table 2, compared with the method that comparative example 2 uses desulfurizing agent A, the present invention uses the method for desulfurizing agent 1-3 to take off Sulphur efficiency is higher.Further, compared with comparative example 3, at high temperature flue gas is taken off with the mixture of oxygen-containing gas and desulfurizing agent During sulfur, desulfuration efficiency is higher.
Inventor's test records, and compared with other Contact Temperature, flue gas connects at 100-220 DEG C with spraying into mixture Touching, the desulfuration efficiency of flue gas is higher.
Experimental example 5 contamination and dust stratification amount
Embodiment 4-6 and comparative example 4 use same model boiler.
Observe being stained with of boiler flue (radial dimension of flue being identical with length) after embodiment 4-6 is burnt with comparative example 4 Dirty situation and dust stratification amount, the results are shown in Table 3.
Table 3
As shown in Table 3, compared to comparative example 4, the coal combustion process that the present invention adds waterglass and calcium oxide together burns is stained with Dirty degree is lower, and dust stratification amount is less.
Obviously, above-described embodiment is only for clearly demonstrating example, and not restriction to embodiment.Right For those of ordinary skill in the field, can also make on the basis of the above description other multi-form change or Variation.Here without also cannot all of embodiment be given exhaustive.And the obvious change thus extended out or Change among still in the protection domain of the invention.

Claims (10)

1. a coal combustion process for clean environment firendly, comprises the steps,
1) coal, waterglass and calcium oxide are mixed, and burn;
2) by oxygen-containing gas and desulphurizer mixing, mixture is obtained;
3) by step 1) flue gas that produces of burning and step 2) mixture contact at 100-220 DEG C, then flue gas is removed Dirt;
Wherein, the preparation method of described desulfurizing agent comprises the steps:
(1) soluble iron saline solution and polylactic acid are mixed;In mixture, add urea liquid, be slow added into sodium bicarbonate Solution also mixes, until pH value reaches 6.8-7.5;
(2) material that step (1) is obtained 130-160 DEG C, react 1-3 hour under the conditions of 0.10-0.20MPa, sedimentation obtains Precipitation granule;
(3) described precipitation granule is mixed with binding agent, pore creating material, dries, then roasting in oxygen-containing atmosphere;
(4) calcining matter that step (3) obtains is put into constant temperature dipping in the polylactic acid of 160-200 DEG C, then dries, cool down.
Method the most according to claim 1, wherein, step 2) in, the consumption of described oxygen-containing gas is 1-3m3/ (kg desulfurization Agent).
Method the most according to claim 1, wherein, step 3) in, flue gas (in terms of sulfur dioxide in flue gas) is mixed with described The weight ratio of the desulfurizing agent in compound is 1:(1-20).
Method the most according to claim 1, wherein, step 3) in, the water content of described flue gas is 5%-20% (w/w).
Method the most according to claim 1, wherein, step 3) in, described flue gas is contrary with mixture edge in desulfurizing tower Flow and contact in direction.
Method the most according to claim 1, wherein, the addition of described soluble iron saline solution is 100-200 weight portion, The addition of the described polylactic acid in step (1) is 7-15 weight portion.
Method the most according to claim 1, wherein, the addition of described urea liquid is 6-13 weight portion.
Method the most according to claim 1, wherein, the drying temperature in step (3) and/or step (4) is 160-180 ℃。
Method the most according to claim 1, wherein, the sintering temperature in step (3) is 200-250 DEG C.
10. according to the method according to any one of claim 1-9, wherein, the addition of the described polylactic acid in step (4) is 20-50 weight portion.
CN201610777929.4A 2016-08-30 2016-08-30 Clean and environment-friendly coal combusting method CN106322423A (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101874968A (en) * 2009-12-31 2010-11-03 中北大学 Iron complex desulfurizer suitable for super-gravity desulfurization
CN103691299A (en) * 2013-12-23 2014-04-02 北京三聚环保新材料股份有限公司 Preparation method of high-sulfur-capacity normal-temperature composite desulfurizer
CN104031693A (en) * 2014-05-21 2014-09-10 梁鹏 Integrated device and process for carrying out desulfurization, dust removal and modification on coal-pyrolyzed gas
CN204865475U (en) * 2015-07-31 2015-12-16 辽宁中电投电站燃烧工程技术研究中心有限公司 Coal -fired power plant boiler flue gas desulphurization device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101874968A (en) * 2009-12-31 2010-11-03 中北大学 Iron complex desulfurizer suitable for super-gravity desulfurization
CN103691299A (en) * 2013-12-23 2014-04-02 北京三聚环保新材料股份有限公司 Preparation method of high-sulfur-capacity normal-temperature composite desulfurizer
CN104031693A (en) * 2014-05-21 2014-09-10 梁鹏 Integrated device and process for carrying out desulfurization, dust removal and modification on coal-pyrolyzed gas
CN204865475U (en) * 2015-07-31 2015-12-16 辽宁中电投电站燃烧工程技术研究中心有限公司 Coal -fired power plant boiler flue gas desulphurization device

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