CN1895742A - Coal-fired boiler smoke devulcanization - Google Patents
Coal-fired boiler smoke devulcanization Download PDFInfo
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- CN1895742A CN1895742A CN 200610090638 CN200610090638A CN1895742A CN 1895742 A CN1895742 A CN 1895742A CN 200610090638 CN200610090638 CN 200610090638 CN 200610090638 A CN200610090638 A CN 200610090638A CN 1895742 A CN1895742 A CN 1895742A
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Abstract
A process for desulfurizing the fume generated by the boiler burning coal features that the desulfurizing agent and coal are simultaneously burning in the boiler. Said desulfurizing agent is one or more of lignin, paper-making black liquid, straw and/or stalk, wheat bran, rice husk, etc.
Description
Technical field
The present invention relates to a kind of coal-fired boiler smoke devulcanization, belong to the sulfide separation technology field.
Background technology
The oxysulfide that is produced for coal-burning boiler combustion of sulfur coal uses physical method to be difficult to remove, and generally adopts chemical method to make it become precipitation or other not volatile stable materials, pollutes thereby reduce.
The general method that adopts of boiler flue gas desulfurization has at present:
1. desulfurization before the burning: before coal enters the stove internal combustion, wash sulphur or solid sulphur, lower the content of sulphur in the coal.
2. desulfurization in the burning: when the coal stove internal combustion, add chemical sulphur-fixing agent, make sulphur become not volatile material.
3. flue gas desulfurization: the flue gas that produces behind the coal combustion is being discharged into before the atmosphere, reduces SO through the whole bag of tricks
2Discharging.
With present technology, the above two all do not reach the desulfurization standard that country allows, so generally all adopt flue gas desulfurization now.
The main method of flue gas desulfurization has dry flue gas desulphurization, semi-dry process flue gas desulphurization and wet process of FGD.Flue gas is gas, the mix dust body that coal burning produces, generally with m
3/ h (the per hour cubic meter number of discharging) weighs.The generating capacity of flue gas is relevant with factors such as coal, device type, combustion positions.The exhaust smoke level of the general unit capacity 1KW of thermal power plant unit (sending out one kilowatt) approximately is 3-5m
3/ h; And medium small boiler calculates by rated capacity of boiler, and wherein t/h per hour represents the tonnage of producing steam, also cries and steams ton.
The basic principle of flue gas desulfurization is acid, the alkali neutralization reaction of chemical reaction.SO in the flue gas
2Be acidic materials,, generate sulphite or sulfate by reacting with alkaline matter, thereby with the SO in the flue gas
2Remove.The most frequently used alkaline matter is lime stone (calcium carbonate, CaCO
3), quick lime (calcium oxide, CaO) and white lime (calcium hydroxide, Ca (OH)
2), also can use other alkaline matters such as ammonia and seawater.
SO
2And being reflected between alkaline matter is called the wet process of FGD technology in the alkaline solution, is called dry method or semi-dry process flue gas desulphurization technology at the wetted surface of solid alkaline material.
Limestone/gypsum method flue gas desulfurization technique in the wet process of FGD technology is present the most ripe in the world flue gas desulfurization technique, and desulfuration efficiency is greater than 95%, import flue gas SO
2Concentration 10010mg/Nm
3Suitable coal scope is wide, desulfuration efficiency is high, absorbent utilization rate height; The operation rate height; The functional reliability height; The lime stone source is abundant and cheap.But the method one-time investment expense height; The operating cost height; Floor space is bigger; The system management operation complexity; The erosion corrosion phenomenon is comparatively serious; The by-produced gypsum intractable; Desulfurization wastewater is more difficult.
Simple, the system's availability height of seawater desulfurizing process, but this method only is applicable to beach power plant, and can only be applicable to coal-fired sulfur content less than in 1.5%, low-sulfur coal.
Ammonia process of desulfurization reaction speed is than lime stone and SO
2Reaction fast, equipment does not have fouling and clogging, no waste water, waste sludge discharge.But this method absorbent-ammoniacal liquor price height.
Dry method, semi-dry process flue gas desulphurization mainly contain the once wet activation method of rotary spraying and drying method, in-furnace calcium spraying afterbody, recirculating fluidized bed method, electron beam irradiation method etc.Wherein rotary spraying and drying method system is simple relatively, invests lowly, and operating cost is not high, and desulfurizing byproduct is easy to handle.But it is low that shortcoming is a desulfuration efficiency.Circulating fluidized bed desulfur technical pattern is simple, and cost is low, but is applicable to sulphur coal.Electron beam irradiation method desulfurization degree height, system is simple, and is easy to operate, and process is easy to control, the cost height but equipment has high input.
During the once wet activation method of in-furnace calcium spraying afterbody relatively is fit to, low-sulfur coal, and because the installation of this method activator is little to the unit operation influence, in being fit to, the transformation of low capacity unit and old power plant.But technology desulfuration efficiency is lower than wet method desulfuration efficiency in this, and desulfuration efficiency is 50%-85%.
Go up the experience and lessons of desulfurizing item power plant from recent years some, existed comparatively serious unsustainable property in the desulfurization work, caused partial desulfurization facility operation cost too high, hard to carry on.In the desulfurizer actual motion owing to substantially exceed design condition, as ature of coal change, reasons such as boiler leaks out, flue-gas temperature variation, occur that efficient is low, fouling, burn into wearing and tearing, sealing water are leaked, problems such as fan noise is big, wastewater treatment.
Summary of the invention
The object of the present invention is to provide a kind of coal-fired boiler smoke devulcanization.
Above-mentioned coal-fired boiler smoke devulcanization is to add desulfurizing agent in the boiler in coal combustion, itself and coal are burnt simultaneously realize, described desulfurizing agent can be one or more the mixing in lignin, alkaline pulping black liquor and goods thereof, crop stalk, rice chaff, wheat bran and farming, the woods crop different parts.
Above-mentioned generated by paper alkali pulping black liquor goods are meant black liquor are dehydrated solid after the processing.Because black liquor is bulky, be not easy to transportation, therefore, when considering transportation problem, should handle by first drying and dehydrating, be beneficial to save cost.
Preferred rice chaff of above-mentioned desulfurizing agent and/or wheat bran.Chaff is skin or the shell that takes off on the paddy and wheat reality.When using rice chaff and/or wheat bran, the removal effect of flue gas sulphur oxide is best, and it significantly shows, under the certain prerequisite of desulfurized effect, and the consumption minimum of desulfurizing agent.
In the inventive method, crop stalk also is a kind of good desulfurizing agent.Straw are the later stem of crops harvesting, and it uses as desulfurizing agent, when satisfying boiler flue gas desulfurization, has also solved the stacking problem of farmland discarded object, and preferred crop stalk is wheat straw, beanstalk, sorghum stalks or corn stalk.
In the inventive method, the principle of selecting for use of desulfurizing agent is an agriculture and industry waste, in line with the principle of twice laid, carries out the experiment and the research of desulfurization, and its sharpest edges are that the cost of desulfurizing agent can reduce to very low.Therefore, under such principle, described farming, woods crop different parts can have very big intension, that is, under the prerequisite that can satisfy the desulfurization purpose, any farming, woods crop different parts all may be used on the inventive method.Researcher of the present invention is by a large amount of experiment screenings, and the different parts that has proposed following farming, woods crop especially is used for the inventive method: Mai Ye, straw, straw leaf, cotton stalk, cotton leaf, square, maize leaves, corncob, maize peel, reed, reed leaf, giantreed, Folium Arundinis donacis, ring, the leaf of bamboo, beans leaf, jowar leaf, jowar fringe, wood chip, trunk, branch or leaf; In the middle of these, especially with the best results of wheat leaf, straw or straw leaf.
In further research of the present invention, the researcher has proposed desulfurizing agent in the described method and the amount ratio of coal is 1 ton of consumption of coal 0.5-2m
3Desulfurizing agent, 1 ton of coal combustion of just every input, the consumption of corresponding desulfurizing agent should be controlled at the 0.5-2 cubic meter.This wherein not only be decided by the heterogeneity of desulfurizing agent with magnitude relation, also be decided by the character of institute's coal combustion, the most outstanding is and the sulfur content of coal has relation.Basic relation is, the addition of desulfurizing agent is big more, and the sulfur content of coal is low more, and desulfurized effect is good more.
When the sulfur content of coal is 3% when following, can carry out the control and the adjustment of final desulfurized effect by the addition of control desulfurizing agent, under the situation of existing boiler, have more satisfactory adjusting relation.
Except that black liquor of pulp making, desulfurizing agent should dryly be handled before use, and making its water content is below 20%, helps the rapid burning of desulfurizing agent like this.
In view of the desulfurizing agent among the present invention mostly from the field-crop discarded object, wherein contain a lot of sandstone impurity, so desulfurizing agent should carry out removal of impurities before use to be handled, and rejects sandstone impurity wherein, is beneficial to completing combustion, does not increase the burden of equipment.
In order to make the desulfurizing agent sufficient combustion, desulfurizing agent of the present invention should carry out pulverization process before use, makes its grain diameter less than 5cm, and preferred particle diameter should be less than 5mm; In such cases, the mode that this desulfurizing agent adds boiler is that air-flow is carried, and makes it be the combustion chamber that the state of spurting enters boiler.
In order to make desulfurizing agent satisfy in moment the requirement of burning rapidly, described desulfurizing agent adds the temperature of boiler position should be at 800-1200 ℃, and in this scope, desulfurizing agent can fully combine with the sulphur in the flue gas, sulphur is adhered to and solidifies the purpose of realization desulfurization.
Coal-burning boiler in the inventive method can be CFBB or coal-powder boiler, and state and desulphurization mechanism in view of desulfurizing agent preferably use CFBB.
With the wheat bran is example, and method of the present invention is directly adding it boiler combustion when indoor, and wheat bran and coal be simultaneously in the stove internal combustion, the SO that potassium wherein can be emitted with coal combustion
2Reaction has reduced the sulfur content in the flue gas, and when realizing the desulfurization purpose, a large amount of heat is also emitted in the wheat bran burning, has increased the temperature in the stove, helps the operation of boiler.After tested, coal 1m per ton
3The consumption of wheat bran can make amount of sulfur contenting in smoke by 3300mg/Nm
3Drop to 340mg/Nm
3, effect is extremely obvious, well below the discharge standard 1200mg/Nm of national requirements
3According to the fluctuation of factors such as water content, the quality of every cube of wheat bran is approximately about 200Kg, and therefore, in the middle of practical application, the consumption of coal and wheat bran can be controlled at about 5: 1.
Because the desulfurizing agent that the present invention uses is generally agriculture and industry waste, wheat bran for example, it only is a kind of reluctant cereal waste material, thereby when consuming a large amount of discarded objects, realized the purpose of boiler flue gas desulfurization, the desulfurization degree of coal-burning boiler is reached more than 80%, flue gas contains amount of sulfur dioxide and has compared tangible reduction with conventional method, and do not need equipment is carried out big transformation, processing ease, small investment, operating cost is low, machinery is not had wearing and tearing, and solved the situation of a large amount of waste pollutions thus.
The specific embodiment
Embodiment 1
To pulverize behind the wheat bran dryness in the sun, making its grain diameter is 5mm, uses blower fan that wheat bran is blown into the feeder of coal-powder boiler, and spirt stove internal combustion, the sulfur content of coal are 3%, and addition is 1 ton of coal 2m
3Wheat bran, after tested, the sulfur dioxide in flue gas concentration of emission is 1180mg/m
3
Embodiment 2
To pulverize behind the wheat bran dryness in the sun, making its grain diameter is 3mm, uses blower fan that wheat bran is blown into the coal-powder boiler feeder, and spirt stove internal combustion, the sulfur content of coal are 1.5%, and addition is 1 ton of coal 1m
3Wheat bran, after tested, the sulfur dioxide in flue gas concentration of emission is 340.0mg/m
3
Embodiment 3
To pulverize behind the wheat straw dryness in the sun, make its grain diameter less than 1cm, use blower fan that wheat bran is blown into the burner hearth of CFBB, enter combustion chambers burn, the sulfur content of coal is 3%, and addition is 1 ton of coal 1.5m
3Wheat straw, after tested, the sulfur dioxide in flue gas concentration of emission is 890.5mg/m
3
Embodiment 4-34
With reference to the method for previous embodiment, use following different desulfurizing agents, carry out small scale experiments, the result is as follows:
| Embodiment | Desulfurizing agent | Doctor solution consumption (m 3/ ton coal) | The sulfur content % of coal | The boiler type | SO 2Concentration of emission mg/m 3 |
| 4 | Lignin | 0.5 | 3.0 | Coal-powder boiler | 700 |
| 5 | Paper-making pulping black liquor | 5 | 3.0 | Coal-powder boiler | 1190 |
| 6 | Rice chaff | 1 | 1.0 | Coal-powder boiler | 980 |
| 7 | Beanstalk | 1.2 | 2.5 | Coal-powder boiler | 898 |
| 8 | Sorghum stalks | 2 | 3.0 | Coal-powder boiler | 901 |
| 9 | Corn stalk | 2.5 | 4.5 | Coal-powder boiler | 1110 |
| 10 | Mai Ye | 1 | 2.5 | Coal-powder boiler | 833 |
| 11 | Straw | 1.2 | 0.5 | Coal-powder boiler | 923 |
| 12 | The straw leaf | 1 | 1.5 | Coal-powder boiler | 810 |
| 13 | Cotton stalk | 2 | 1.5 | Coal-powder boiler | 751 |
| 14 | Cotton leaf | 2 | 4.0 | Coal-powder boiler | 815 |
| 15 | Square | 2 | 3.0 | Coal-powder boiler | 550 |
| 16 | Maize leaves | 1 | 3.5 | Coal-powder boiler | 967 |
| 17 | Corncob | 2 | 3.0 | Coal-powder boiler | 797 |
| 18 | Maize peel | 2 | 2.5 | Coal-powder boiler | 870 |
| 19 | Reed | 1.3 | 4.5 | Coal-powder boiler | 934 |
| 20 | The reed leaf | 1.1 | 4.5 | Coal-powder boiler | 911 |
| 21 | Giantreed | 3 | 4.0 | Coal-powder boiler | 901 |
| 22 | Black liquor dehydrates the solid after the processing, is ground into the 3-5mm particle | 0.4 | 1.5 | CFBB | 887 |
| 23 | Folium Arundinis donacis | 2 | 3.5 | Coal-powder boiler | 864 |
| 24 | Ring | 1.4 | 2.0 | Coal-powder boiler | 900 |
| 25 | The leaf of bamboo | 3 | 1.5 | CFBB | 6505 |
| 26 | The beans leaf | 2 | 0.5 | CFBB | 1000 |
| 27 | The jowar leaf | 3 | 2.5 | CFBB | 783 |
| 28 | The jowar fringe | 2 | 1.0 | CFBB | 920 |
| 29 | Wood chip | 1.6 | 1.5 | CFBB | 839 |
| 30 | Trunk | 1.6 | 3.5 | CFBB | 1111 |
| 31 | Branch | 1.5 | 2.0 | CFBB | 1046 |
| 32 | Leaf | 1.0 | 2.5 | CFBB | 1068 |
| 33 | Maize leaves+maize peel+corncob (weight ratio 1: 1: 2) | 2 | 3.0 | CFBB | 957 |
| 34 | Jowar leaf+jowar fringe (weight ratio 1: 2) | 2 | 1.5 | Coal-powder boiler | 991 |
Claims (10)
1, a kind of coal-fired boiler smoke devulcanization, it is characterized in that, described method is to add desulfurizing agent in the boiler in coal combustion, itself and coal are burnt simultaneously, and described desulfurizing agent is one or more mixing in lignin, alkaline pulping black liquor and goods thereof, crop stalk, rice chaff, wheat bran and farming, the woods crop different parts.
2, method according to claim 1 is characterized in that, described desulfurizing agent is rice chaff and/or wheat bran.
3, method according to claim 1 is characterized in that, described crop stalk is wheat straw, beanstalk, sorghum stalks or corn stalk.
4, method according to claim 1, it is characterized in that described farming, woods crop different parts are wheat leaf, straw, straw leaf, cotton stalk, cotton leaf, square, maize leaves, corncob, maize peel, reed, reed leaf, giantreed, Folium Arundinis donacis, ring, the leaf of bamboo, beans leaf, jowar leaf, jowar fringe, wood chip, trunk, branch or leaf; Preferred wheat leaf, straw or straw leaf.
According to each described method of claim 1-4, it is characterized in that 5, the desulfurizing agent in the described method and the amount ratio of coal are 1 ton of consumption of coal 0.5-2m
3Desulfurizing agent.
6, method according to claim 5 is characterized in that, the sulfur content of described coal is below 3%.
According to each described method of claim 1-4, it is characterized in that 7, described desulfurizing agent should dryly be handled before use, making its water content is below 20%.
According to each described method of claim 1-4, it is characterized in that 8, described desulfurizing agent should carry out removal of impurities before use to be handled, and rejects sandstone impurity wherein.
According to each described method of claim 1-4, it is characterized in that 9, described desulfurizing agent should carry out pulverization process before use, make its grain diameter less than 5cm; Preferred particle diameter should be less than 5mm.
10, method according to claim 1 is characterized in that, described coal-burning boiler is CFBB or coal-powder boiler; The preferred CFBB that uses; The temperature of described desulfurizing agent adding boiler position should be at 800-1200 ℃.
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|---|---|---|---|
| CNB2006100906384A CN100425323C (en) | 2006-06-30 | 2006-06-30 | Coal-fired boiler smoke devulcanization |
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|---|---|---|---|
| CNB2006100906384A CN100425323C (en) | 2006-06-30 | 2006-06-30 | Coal-fired boiler smoke devulcanization |
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| CN100425323C CN100425323C (en) | 2008-10-15 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101760974B (en) * | 2008-10-17 | 2012-10-03 | 山东福荫造纸环保科技有限公司 | Process for performing ammonium sulfite pulping by using sulfur-containing flue gas absorber |
| CN102787000A (en) * | 2012-08-08 | 2012-11-21 | 新汶矿业集团有限责任公司泰山盐化工分公司 | Coal firing boiler smoke gas dry process desulfurizing agent with calorific value |
| CN105903325A (en) * | 2016-05-25 | 2016-08-31 | 常州市东南热电有限公司 | Method for desulfurizing flue gas of boiler |
| CN106622137A (en) * | 2017-01-03 | 2017-05-10 | 南京林业大学 | Production method of adsorbent for removing mercury from flue gas |
| CN112174371A (en) * | 2020-09-21 | 2021-01-05 | 张家港市杨舍丝印工艺厂 | Recycling treatment process for papermaking black liquor |
-
2006
- 2006-06-30 CN CNB2006100906384A patent/CN100425323C/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101760974B (en) * | 2008-10-17 | 2012-10-03 | 山东福荫造纸环保科技有限公司 | Process for performing ammonium sulfite pulping by using sulfur-containing flue gas absorber |
| CN102787000A (en) * | 2012-08-08 | 2012-11-21 | 新汶矿业集团有限责任公司泰山盐化工分公司 | Coal firing boiler smoke gas dry process desulfurizing agent with calorific value |
| CN105903325A (en) * | 2016-05-25 | 2016-08-31 | 常州市东南热电有限公司 | Method for desulfurizing flue gas of boiler |
| CN106622137A (en) * | 2017-01-03 | 2017-05-10 | 南京林业大学 | Production method of adsorbent for removing mercury from flue gas |
| CN112174371A (en) * | 2020-09-21 | 2021-01-05 | 张家港市杨舍丝印工艺厂 | Recycling treatment process for papermaking black liquor |
| CN112174371B (en) * | 2020-09-21 | 2024-06-07 | 河北普鑫纸业有限公司 | Recycling treatment process for papermaking black liquor |
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|---|---|
| CN100425323C (en) | 2008-10-15 |
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