CN102980195B - Method for treating coal chemical gasified slag - Google Patents
Method for treating coal chemical gasified slag Download PDFInfo
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- CN102980195B CN102980195B CN201210511610.9A CN201210511610A CN102980195B CN 102980195 B CN102980195 B CN 102980195B CN 201210511610 A CN201210511610 A CN 201210511610A CN 102980195 B CN102980195 B CN 102980195B
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Abstract
The invention relates to a method for treating coal chemical gasified slag. The method utilizes the rheological characteristic and combustion clotting characteristic of coal slime, the coal slime and the gasified slag are uniformly mixed and then are added with coated slurry, a high-pressure pump pipe delivery technology is adopted to delivery a mixture into a fluidized bed boiler which is hundreds of meters away, and a fluidized bed boiler combustion technology is utilized to realize the comprehensive utilization of the gasified slag. By the method, a phenomenon that the gasified slag is greatly elutriated during the combustion process can be avoided, and a good combustion effect is obtained. According to the method, the delivery speed of a high-pressure pump can be regulated, so that the combustion is very stable, and the automatic combustion control of the fluidized bed boiler is realized; and moreover compared with a belt conveying method, the method is low in cost and is environmental-friendly and stability in combustion can be realized.
Description
Technical field
The invention belongs to chemical industrial waste thing processing technology field, relate to the processing method of waste residue and the useless ash produced in a kind of Chemical Industry coal gasification course, refer more particularly to a kind of coal slime and gasification lime-ash are uniformly mixed to form high underflow body after, add clay wash and then by high-pressure plunger pump and conveyance conduit, high underflow body be transported to the technology of mixed combustion in fluidized-bed combustion boiler.
Background technology
Texaco coal-water slurry gasification (Texact) technology at home chemical enterprise is used widely, its gasifier slag residual carbon content standard≤20%, and slag residual carbon content is about 30% in actual motion, corresponding gasification slag butt caloric value is 3000 kilocalorie about every kilogram.There is very high energy recovery be worth.The slag that gasifies in real process contains more moisture, causes it in storage and transportation inconvenience.
Gasification slag is made up of gasification furnace furnace bottom lime-ash and furnace roof flying dust two parts, furnace bottom lime-ash structure is relatively fine and close, surface does not almost observe the existence of pore structure, and its surface attachment has a large amount of finely ground particle substances, and wherein part finely ground particle substance there occurs obvious melting agglomeration.The structure of furnace roof flying dust is then very lax, subregion is even in cotton-shaped, be entrained with caused by gasification furnace after experienced by violent devolatilization by raw coal in gasification furnace, also reuniting in its surface has a large amount of finely ground particle substances, and wherein part granule also there occurs obvious melting agglomeration.Although at high temperature easily there is grey melt polymerization in the mineral matter of gasification slag, and wherein carbon residue prevents this polymerization to a certain extent, thus defining a grain mineral matter spherula, carbon residue wherein exists with cotton-shaped unformed form all the time, and does not form spherula together with mineral matter.So gasification solid impurity particle degree is little, seepage of water is strong.
The process of gasification slag is a major issue of puzzlement Chemical Industry always, and due to containing more moisture, be not easy to transport, stacking can cause the pollution of environment.Directly gasification slag is carried out burning disposal not only can well dispose these discarded objects, but also can reclaim heat wherein, turns waste into wealth.But directly burning disposal exists several large problem, one is that the moisture of gasification slag is relatively high, is a kind of semisolid state, and gasification slag is sent into quickly and easily burner hearth and burn not too convenient, and traditional Belt Conveying investment and occupation of land are polluted all greatly, easily.The second, coal gasification lime-ash major part material quality is more loose, and direct burning can cause a large amount of composition elutriations to fall, thus causes new pollution, and incomplete combustion.
Summary of the invention
The object of the invention is, according to the feature of front Coal Chemical Industry production process gasification slag, to provide a kind of gasification Slag treatment method newly.Homogeneous phase mixing after coal slime and gasification slag add water by the method, then adds clay wash, by high-pressure plunger pump Cemented filling to the process of fluidized-bed combustion boiler combustion.
The present invention comprises following steps and content:
Step one: gasification slag is transported to fluid bed power plant by loading machine, then puts into gasification slag canopy.
Step 2: gasification slag is carried out sieving, the large granular impurity in removing gasification slag.Consider that gasification slag will carry out Cemented filling, the impurity that grain diameter is greater than more than 0.5cm all will be picked out.
Step 3: the test gasification butt caloric value of slag and the butt caloric value of coal slime, method of testing is conventional method.
Step 4: add water to coal slime sample and carry out rheological experiments, obtains that coal slime in water content is within the scope of 25-40%, shear rate is at 20-50s
-1apparent viscosity in scope, then determines coal slime Cemented filling water content.Be 20-50s in shear rate
-1between, draw apparent viscosity along with coal slime change of moisture content relation curve.On this curve, if along with coal slime water content reduces, it is X that apparent viscosity increases suddenly corresponding percent moisture fast, so when piping feeding distance is less than or equal to 100 meters, during coal slime conveying, percent moisture should be (X+2) ± 1, when piping feeding distance is greater than 100 meters, often increase by 50 meters, coal slime conveying percent moisture increases by 0.5.Coal slime Cemented filling percent moisture is expressed as MX.
Step 5: after determining coal slime conveying water content, carries out rheological experiments to determine the conveying water content of gasification slag to gasification slag.If the apparent viscosity of gasification slag in the situation that do not add water is the apparent viscosity of the coal slime of MX lower than water content, then the slag that gasifies does not need to add water.Otherwise gasification slag adds moisture, after adding certain moisture, its apparent viscosity and water content be the difference of the apparent viscosity of the coal slime of MX when positive and negative 0.2Pas, the slag water content of at this moment gasifying is designated as QX.
Step 6: to calculate water content be the coal slime of MX and water content is the gasification slag As-received caloric value of QX, and computational methods are:
Q
gr,ar＝Q
gr,ad×(100-M
ar)/(100-M
ad) (1)
Q
net,ar＝Q
gr,ar-0.206H
ar-0.023M
ar (2)
Q
gr, adrepresent Dry basis perch caloric value, Q
gr, arrepresent As-received high calorific power, Q
net, arrepresent net calorific value as received basis, M
arrepresent As-received water content, M
adrepresent dry basis moisture content, H
arfor As-received hydrogen content.Water content is that the net calorific value as received basis of the coal slime of MX is designated as Q
net, ar1, water content is that the net calorific value as received basis of the gasification slag of QX is designated as Q
net, ar2.
Step 7: after adding water, the coal slime of water content to be the gasification slag of QX and water content be MX sends into coal slime refiner by scrapper conveyor, by forming high mucilage body after refiner uniform stirring, then enters middle warehouse below.By stirring, mixer in middle warehouse guarantees that the material entered has certain mobility.Gasification slag and coal slime mass mixing ratio are (0.5-2.5): 1; And meet gasification slag to mix afterwards total net calorific value as received basis with coal slime and be greater than 2500 kilocalories.
Step 8: added water by paper white sludge and be modulated into clay wash, clay wash, between 55-58%, is then squeezed into middle warehouse by screw machine by the water content of clay wash, forms comprehensive mixture slurry by stirring.The molar content that the addition of clay wash is divided according to the calcium molar content in white clay and sulfur in coal slurry is determined, keeps calcium sulfur ratio at (1-2): between 1.
Step 9: mixture slurry in middle warehouse is carried out Cemented filling by high-pressure plunger pump, is transported to the fluidized-bed combustion boiler material inlet of tens of rice to hundreds of meters.High-pressure plunger pump discharge pressure at more than 4Mpa, pipe diameter between 50-120mm, each pipeline run 5-15 ton/hour.Mixture is in fluidized-bed combustion boiler combustion, and fluidized-bed combustion boiler bed temperature controls between 880-930 degree.
The present invention is directed to the gasification slag produced in Coal Chemical Industry production process, propose a kind of new processing method, utilize the feature of the agglomeration combustion of coal slime, rheological behavior and fluidized-bed combustion boiler incendivity low calorie fuels, achieve the recycling of gasification lime-ash.Beneficial effect of the present invention is: 1) directly burn with gasification slag or mix with coal compared with the methods such as burning, this method utilizes the agglomeration combustion characteristic of coal slime, and can avoid a large amount of elutriation phenomenons of lime-ash in combustion process that gasify, combustion efficiency is good.2) owing to adopting applied pipeline transportation method, and conveying capacity can pass through adjusting high-pressure pump transporting velocity, burn highly stable, be beneficial to the burns the fuzzy control realizing fluidized-bed combustion boiler, and compared with Belt Conveying mode, cost is low, more environmental protection, burn more stable.3) add paper white sludge and mix with the coal slime lime-ash etc. that gasifies, the utilization of resources can be realized, there is good desulfurized effect.
Detailed description of the invention
The invention will be further described below.
Step one: gasification slag is transported to fluid bed power plant by loading machine, then puts into gasification slag canopy.
Step 2: gasification slag is carried out sieving, the large granular impurity in removing gasification slag.Consider that gasification slag will carry out Cemented filling, the impurity that grain diameter is greater than more than 0.5cm all will be picked out.
Step 3: the test gasification butt caloric value of slag and the butt caloric value of coal slime, method of testing is conventional method.
Step 4: add water to coal slime sample and carry out rheological experiments, obtains that coal slime in water content is within the scope of 25-40%, shear rate is at 20-50s
-1apparent viscosity in scope, then determines coal slime Cemented filling water content.Be 20-50s in shear rate
-1between, draw apparent viscosity along with coal slime change of moisture content relation curve.On this curve, if along with coal slime water content reduces, it is X that apparent viscosity increases suddenly corresponding percent moisture fast, so when piping feeding distance is less than or equal to 100 meters, during coal slime conveying, percent moisture should be (X+2) ± 1, when piping feeding distance is greater than 100 meters, often increase by 50 meters, coal slime conveying percent moisture increases by 0.5.Coal slime Cemented filling percent moisture is expressed as MX.
Step 5: after determining coal slime conveying water content, carries out rheological experiments to determine the conveying water content of gasification slag to gasification slag.If the apparent viscosity of gasification slag in the situation that do not add water is the apparent viscosity of the coal slime of MX lower than water content, then the slag that gasifies does not need to add water.Otherwise gasification slag adds moisture, after adding certain moisture, its apparent viscosity and water content be the difference of the apparent viscosity of the coal slime of MX when positive and negative 0.2Pas, the slag water content of at this moment gasifying is designated as QX.
Step 6: to calculate water content be the coal slime of MX and water content is the gasification slag As-received caloric value of QX, and computational methods are:
Q
gr,ar＝Q
gr,ad×(100-M
ar)/(100-M
ad) (1)
Q
net,ar＝Q
gr,ar-0.206H
ar-0.023M
ar (2)
Q
gr, adrepresent Dry basis perch caloric value, Q
gr, arrepresent As-received high calorific power, Q
net, arrepresent net calorific value as received basis, M
arrepresent As-received water content, M
adrepresent dry basis moisture content, H
arfor As-received hydrogen content.Water content is that the net calorific value as received basis of the coal slime of MX is designated as Q
net, ar1, water content is that the net calorific value as received basis of the gasification slag of QX is designated as Q
net, ar2.
Step 7: after adding water, the coal slime of water content to be the gasification slag of QX and water content be MX sends into coal slime refiner by scrapper conveyor, by forming high mucilage body after refiner uniform stirring, then enters middle warehouse below.By stirring, mixer in middle warehouse guarantees that the material entered has certain mobility.Gasification slag and coal slime mass mixing ratio are (0.5-2.5): 1; And meet gasification slag to mix afterwards total net calorific value as received basis with coal slime and be greater than 2500 kilocalories.
Step 8: added water by paper white sludge and be modulated into clay wash, clay wash, between 55-58%, is then squeezed into middle warehouse by screw machine by the water content of clay wash, forms comprehensive mixture slurry by stirring.The molar content that the addition of clay wash is divided according to the calcium molar content in white clay and sulfur in coal slurry is determined, keeps calcium sulfur ratio at (1-2): between 1.
Step 9: mixture slurry in middle warehouse is carried out Cemented filling by high-pressure plunger pump, is transported to the fluidized-bed combustion boiler material inlet of tens of rice to hundreds of meters.High-pressure plunger pump discharge pressure at more than 4Mpa, pipe diameter between 50-120mm, each pipeline run 5-15 ton/hour.Mixture is in fluidized-bed combustion boiler combustion, and fluidized-bed combustion boiler bed temperature controls between 880-930 degree.
The present invention determines that the Main Basis of gasification slag and coal slime water content is following aspect.1) coal slime is too high with gasification slag water content, and calorific value just reduces greatly; Water content is too low, and the paste-forming properties of mixture is too poor, and high-pressure pump discharge pressure and energy consumption are all too high.Coal slime water content defining method is determined according to rheological experiment and theory calculate, can guarantee that discharge pressure and boiler efficiency are comprehensively optimum like this.2) experiment shows under identical apparent viscosity, and gasification slag and the mixed apparent viscosity change of coal slime not quite, therefore can determine gasification slag water content according to the apparent viscosity of coal slime.Gasification slag mixes with coal slime and proportioning is 0.5-2.5:1, and after meeting mixing net calorific value as received basis be greater than 2500 kilocalories according to being: 1) when after mixing, net calorific value as received basis is lower than 2500 kilocalorie time, when adding desulfurizing agent, the calorific value of fuel is just too low, is unfavorable for the burning of fluidized-bed combustion boiler.2) gasify slag ground relative loose, and calorific value is relatively low, cannot directly in fluidized-bed combustion boiler combustion.And coal slime has agglomeration combustion characteristic in fluid bed, cohesive is good, so can keep higher calorific value after coal slime and the mixing of gasification slag, can have again good agglomeration combustion characteristic, be not easy elutriation in combustion process.3) after gasification slag and coal slime ratio are higher than 2.5:1, the bonding defective tightness of mixture, agglomeration combustion effect is bad, easily produces elutriation, and therefore gasification slag and coal slime mixed proportion should not higher than 2.5.When gasify slag and coal slime ratio lower than 0.5 time, the treating capacity of gasification slag is relative too little, has little significance.
Adopt paper white sludge to add water after pulping in addition to mix with the mixture of coal slime and the slag that gasify again, and the foundation of Cemented filling is: 1) paper white sludge is the refuse produced in alkali collection replacement process.In paper white sludge, moisture is at about 40-50%, and in solid matter, calcium carbonate powder generally accounts for more than 80%, can be used for desulfurization.Small amounts calcium, magnesia, Ca (OH) is also comprised in paper white sludge
2, and NaOH and Na
2cO
3deng.These materials all can react with sulfur dioxide, reach desulfurization object.2) experiment shows, when paper white sludge adds water and reaches 55-58% water content, to have good slurry, and apparent viscosity and water content are that the coal slime of MX is more or less the same, and is applicable to Cemented filling.And paper white sludge burns after mixing with coal slime, the slag that gasifies again and has better desulfurized effect, than direct spray calcium or directly paper white sludge to be sent into the desulfurized effect of burner hearth high by more than 10%.
Claims (1)
1. a processing method for Coal Chemical Industry gasification slag, is characterized in that the concrete steps of the method are:
Step one: gasification slag is transported to fluid bed power plant by loading machine, then puts into gasification slag canopy;
Step 2: gasification slag is carried out sieving, the grain diameter in removing gasification slag is greater than the impurity of more than 0.5cm;
Step 3: the test gasification butt caloric value of slag and the butt caloric value of coal slime;
Step 4: add water to coal slime sample and carry out rheological experiments, obtains that coal slime in water content is within the scope of 25-40%, shear rate is at 20-50s
-1apparent viscosity in scope, then determines coal slime Cemented filling water content; Be 20-50s in shear rate
-1between, draw apparent viscosity along with coal slime change of moisture content relation curve; On this curve, if along with coal slime water content reduces, it is X that apparent viscosity increases suddenly corresponding percent moisture fast, so when piping feeding distance is less than or equal to 100 meters, during coal slime conveying, percent moisture should be (X+2) ± 1, when piping feeding distance is greater than 100 meters, often increase by 50 meters, coal slime conveying percent moisture increases by 0.5; Coal slime Cemented filling percent moisture is expressed as MX;
Step 5: after determining coal slime conveying water content, carries out rheological experiments to determine the conveying water content of gasification slag to gasification slag; If the apparent viscosity of gasification slag in the situation that do not add water is the apparent viscosity of the coal slime of MX lower than water content, then the slag that gasifies does not need to add water, otherwise gasification slag adds moisture; After adding certain moisture, its apparent viscosity and water content be the difference of the apparent viscosity of the coal slime of MX when positive and negative 0.2Pas, the slag water content of at this moment gasifying is designated as QX;
Step 6: to calculate water content be the coal slime of MX and water content is the gasification slag As-received caloric value of QX, and computational methods are:
Q
gr,ar＝Q
gr,ad×(100-M
ar)/(100-M
ad) (1)
Q
net,ar＝Q
gr,ar-0.206H
ar-0.023M
ar (2)
Q
gr, adrepresent Dry basis perch caloric value, Q
gr, arrepresent As-received high calorific power, Q
net, arrepresent net calorific value as received basis, M
arrepresent As-received water content, M
adrepresent dry basis moisture content, H
arfor As-received hydrogen content; Water content is that the net calorific value as received basis of the coal slime of MX is designated as Q
net, ar1, water content is that the net calorific value as received basis of the gasification slag of QX is designated as Q
net, ar2;
Step 7: after adding water, the coal slime of water content to be the gasification slag of QX and water content be MX sends into coal slime refiner by scrapper conveyor, by forming high mucilage body after refiner uniform stirring, then enters middle warehouse below; By stirring, mixer in middle warehouse guarantees that the material entered has certain mobility; Gasification slag and coal slime mass mixing ratio are (0.5-2.5): 1; And meet gasification slag to mix afterwards total net calorific value as received basis with coal slime and be greater than 2500 kilocalories;
Step 8: paper white sludge is added water and is modulated into clay wash, clay wash, between 55-58%, is then squeezed into middle warehouse by screw machine by the water content of clay wash, forms comprehensive mixture slurry by stirring; The molar content that the addition of clay wash is divided according to the calcium molar content in white clay and sulfur in coal slurry is determined, keeps calcium sulfur ratio at (1-2): between 1;
Step 9: mixture slurry in middle warehouse is carried out Cemented filling by high-pressure plunger pump, is transported to the fluidized-bed combustion boiler material inlet of tens of rice to hundreds of meters; High-pressure plunger pump discharge pressure at more than 4Mpa, pipe diameter between 50-120mm, each pipeline run 5-15 ton/hour; Mixture is in fluidized-bed combustion boiler combustion, and fluidized-bed combustion boiler bed temperature controls between 880-930 degree.
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| CN103486597A (en) * | 2013-09-27 | 2014-01-01 | 苏州展阳新能源科技有限公司 | Process and device for burning tanning sludge by adopting fluidized bed suspended boiler |
| CN103695066B (en) * | 2013-12-18 | 2016-03-16 | 贵州赤天化集团有限责任公司 | Hard coal coal slurry gasifier discharges reuse method and the structure thereof of thin slag |
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| JP4132212B2 (en) * | 1998-04-20 | 2008-08-13 | 新日本製鐵株式会社 | Zirconia-graphite refractory with excellent corrosion resistance and nozzle for continuous casting using the same |
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| US4045092A (en) * | 1975-09-22 | 1977-08-30 | The Keller Corporation | Fuel composition and method of manufacture |
| CN1958756A (en) * | 2005-11-05 | 2007-05-09 | 陈福才 | Pressure gasified, water-repellent, drying free agent for bonding coal in gasified industry type |
| CN101260321A (en) * | 2007-03-07 | 2008-09-10 | 中国科学院工程热物理研究所 | Gasification island method |
| CN101456689A (en) * | 2009-01-08 | 2009-06-17 | 长安大学 | Comprehensive utilization method of coal water slurry gasified waste residue on Texaco gasifier |
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