CN1307387C - Method for removing ink from waste paper by firing - Google Patents
Method for removing ink from waste paper by firing Download PDFInfo
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- CN1307387C CN1307387C CNB2004100967887A CN200410096788A CN1307387C CN 1307387 C CN1307387 C CN 1307387C CN B2004100967887 A CNB2004100967887 A CN B2004100967887A CN 200410096788 A CN200410096788 A CN 200410096788A CN 1307387 C CN1307387 C CN 1307387C
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- Treatment Of Sludge (AREA)
Abstract
The present invention discloses a method for burning wet waste paper deinking sludge, which is used for treating wastes-the deinking sludge generated by paper making industry. The burning method causes the wet waste paper deinking sludge to be modified into fuels which are easy to burn, and the burning is carried out in a burning boiler with a general layer. The method comprises the following steps: dewatering: the wet waste paper deinking sludge with the dryness of less than 42% is dewatered to cause the dryness to reach 42 to 75%; adding a burning accelerator: the burning accelerator which at least has one of the functions for burning substances with low burning point in the sludge, accelerating the burning, eliminating smoke, turning and loosing, and removing ash; molding: the deinking sludge is molded in an extrusion mode to cause the deinking sludge to become molding sludge satisfying the requirement of the burning; burning: the molded deinking sludge is continuously burned in the burning boiler with the general layer. Compared with the prior art, the treating method of the deinking sludge has the advantages of environmental protection, high efficiency, energy saving, simplicity and economy. The method is widely generalized and applied to the paper making industry, and the method can generate great economical efficiency and profound social efficiency.
Description
Technical field
The present invention relates to the method for a kind of method of burning sludge, particularly a kind of removing ink from waste paper by firing, be used for discarded object---the processing of deinked sludge that paper industry produces, also can be used for the processing of municipal sludge.
Background technology
Deinked sludge is that the paper mill is when using waste paper as paper making raw material, at the discarded object that the deinking step produces, quantity is very huge, such as, for deinked newsprint, one ton of newsprint of every production will produce 80-150 kilogram dewatered sludge or the wet mud of 150-500 kilogram.Most factories use filter press or band filter that mud is pressed dry the wet basis mass dryness fraction of 20-30%, send the soot landfill then.In recent years some technical schemes that occurred the comprehensive utilization deinked sludge successively: do the filler of plastic products, with clay manufacturing bricks by mixing, pressboard, cook soil conditioner, make compost or the like, these technical schemes all have certain effect of integrated pest management, but because multifactorial restrictions such as economy, scale, quality and purposes, these schemes are not extensively adopted by the paper mill, most deinked sludges remain landfill disposal, are wasting valuable land resource.In addition, contain heavy metal elements such as Cu, Pb, Cr in the deinked sludge, though content is less, they can accumulate in soil and pollute.Therefore, deinked sludge landfill disposal and as soil conditioner or make compost the The Long-term Effect of environment is still waiting further checking.
Aspect the deinked sludge energy, more general way has two kinds at present.The one, mix with other high heating value discarded objects such as waste plastics, damaged tire etc. after deinked sludge being pressed dry the mass dryness fraction of 30-50%, burn with fluidized-bed combustion boiler; The 2nd, mud is dried mass dryness fraction more than 85%, then separately or with the coal mixed burning.
Burn with fluidized-bed combustion boiler, its sand grains is heated to 650-750 ℃ with the light oil burning, add mud and the high heating value rubbish of mass dryness fraction more than 30% then and carry out mixed combustion, burn the back ash and account for the 25-50% that enters the burning sludge oven-dry weight, the ash that burns the back generation can use to the cement plant or as plastic additive, to reach the purpose that turns waste into wealth.There are the following problems for this processing method: 1, other high heating value rubbish of Hun Heing often can produce serious secondary pollution, especially waste plastics and damaged tire in burning process, and the investment of special environment protection abatement equipment and operating cost are all very high; 2, can not burn with common chain-grate boiler and spreader stoker boliler, need to adopt fluidized-bed combustion boiler, its investment and operating cost are all high a lot of than conventional chains boiler.And the mud that will wet is dried the mass dryness fraction more than 85%, need to consume a large amount of heat energy and power, energy-conservation and all be very non-remunerative economically.
Summary of the invention
Technical problem to be solved by this invention is: overcome the defective that prior art exists, a kind of method of removing ink from waste paper by firing is provided, can uses common grate firing boiler---chain-grate boiler and spreader stoker boliler directly or with other fuel mix not wet mud of deinking of drying that burns.
The present invention addresses the above problem the technical scheme that is adopted: the method for this removing ink from waste paper by firing, be characterized in: with the wet sludge modification of deinking is easy burnt fuel, adopt common grate firing boiler to burn, described incinerating method may further comprise the steps:
A, dehydration, the wet sludge dewatering of deinking with mass dryness fraction＜42% makes its mass dryness fraction reach 42～75%;
B, moulding, the back deinked sludge that will dewater carries out extrusion modling, makes it become the moulding mud that satisfies combustion requirements;
C, burning are burnt the deinked sludge of extrusion modling in common grate firing boiler continuously.
The wet mud of deinking is modified as easy burnt fuel by dehydration, forming step, mixes with any ratio separately or with other fuel, carry out burning disposal at common grate firing boilers such as chain-grate boiler, spreader stoker bolilers.
Apply the combustion adjuvant step between dehydration of the present invention and the forming step in addition, in the dehydration deinked sludge, add have at least the low ignition point material that can make in the mud in high humidity environment, light, combustion-supporting, and the combustion adjuvant of one of smoke elimination, scarifying, deashing function.When independent use sludge incineration, and the calorific capacity of deinked sludge promptly burn before wet basis when being lower than 2.5MJ/Kg, then in deinked sludge, need add chemical combustion adjuvant; Then can be when the calorific capacity with burning of other fuel mix or mud is higher than 2.5MJ/Kg with combustion adjuvant, also can be not with combustion adjuvant straight forming, burning.
Combustion adjuvant of the present invention adopts the multistage composite combustion adjuvant, its composition contains low melting point combustion adjuvant and high-melting-point combustion adjuvant and scarifying agent at least, the mode that applies of described combustion adjuvant adopts liquid spraying to apply or pressed powder stirs the mode that applies, it is that combustion adjuvant with liquid state sprays in the deinked sludge before type is pressed equably that described liquid spraying applies, and described pressed powder stirs and applies is to press preceding deinked sludge evenly to mix with type the pressed powder state combustion adjuvant that applies by mixer.The low melting point combustion adjuvant is low melting point goods and materials such as potassium permanganate, sodium chlorate, and the high-melting-point combustion adjuvant is one or more mixtures in potassium chlorate, sodium nitrate, the potassium nitrate, and the scarifying agent is a sodium chloride.
Dehydration of the present invention adopts the secondary dewatering process, at first deinked sludge is pressed dry the mass dryness fraction of 25-30% with belt filter press, with spiral dewater or roll-type press drier deinked sludge is continued to extract the mass dryness fraction of 42-75% then, the waste water that second level dehydration produces is sent the first order back to and is filtered again.
Extrusion modling step of the present invention is used the make-up machine moulding, and the briquetting pressure scope of make-up machine is 100-5000N/cm
2, moulding be shaped as a kind of in incendive mosaic type, spheroid shape, ovum type, pillow type, circle honeycomb type, square honeycomb type, the water chestnut cylindricality.
Dehydration of the present invention and forming step lump together and carry out, the dewaterer that adopts band moulding function is with the dehydration earlier of the wet mud of deinking, and reshaping is a kind of shape in incendive mosaic type, spheroid shape, ovum type, pillow type, circle honeycomb type, square honeycomb type, the water chestnut cylindricality.
Mixing fire coal after the dehydration of the present invention or in the mud behind the forming step and carry out moulding or burning again, is the SO that produces when reducing fired coal combustion in its combustion step
2Pollute, the spray that incineration tail gas reduces pollution is handled with the deinked sludge residue aqueous emulsion after the burning that contains a large amount of CaO.
The present invention compared with prior art has the following advantages and beneficial effect: the method for this removing ink from waste paper by firing, through mechanical dehydration, to mix combustion adjuvant, extrusion modling step be the fuel of the type coal shape of burning easily with wet paper-making deinking sludge modification, can be at common grate firing boiler---in common chain-grate boiler and the spreader stoker boliler independent or with other fuel mix sustained combustions.The processing method of this deinked sludge is mixed the back dries more environmental protection of prior art, more effective, more energy-conservation, simpler, more economical such as mass dryness fraction burning more than 85% than landfill disposal, with other high heating value discarded objects with fluidized-bed combustion boiler burning and with mud, the method must produce huge business efficiency and far-reaching social efficiency in the wide popularization and application of paper industry.
Description of drawings
Fig. 1 is application example 1 a deinking wet sludge incineration schematic flow sheet of the present invention.
Fig. 2 is application example 2 deinking wet sludge incineration schematic flow sheets of the present invention.
The specific embodiment
The method of this kind removing ink from waste paper by firing, be with the wet mud of deinking by mechanical dehydration, apply combustion adjuvant, extrusion modling is modified as easy burnt fuel, adopts common grate firing boiler to burn.The incinerating method of embodiment may further comprise the steps:
1, dehydration.
The wet mud mechanical system of deinking with mass dryness fraction＜42% adopts single-stage or multistage dewatering process, and the wet mud of deinking is pressed dry the dehydration deinked sludge that dewaters to mass dryness fraction＞42%.Embodiment adopts the secondary dewatering process, at first deinked sludge is pressed dry 25-30% from the mass dryness fraction of 5-10% with belt filter press, continue deinked sludge is extracted the mass dryness fraction of 42-75% then with spiral dewater or roll-type press drier, the waste water that second level dehydration produces is sent the first order back to and is filtered again, like this, both guarantee the deinked sludge mass dryness fraction, avoided the loss of mud again.
2, apply combustion adjuvant.
When the calorific capacity of deinked sludge is lower than 2.5MJ/Kg, burn separately, need in the dehydration deinked sludge, to add the low ignition point material premature ignition that can make in the mud, the combustion adjuvant of combustion-supporting, smoke elimination, scarifying, scale removal effect is arranged, further improve the combustibility of mud.Then can be when the burning of deinked sludge and other fuel mix or its calorific capacity are higher than 2.5MJ/Kg with combustion adjuvant, also can be not with combustion adjuvant.Embodiment adopts the multistage composite combustion adjuvant, and it is formed, and to contain fusing point at least be high-melting-point combustion adjuvant and the scarifying agent sodium chloride that one or more mixtures in 240 ℃ low melting point combustion adjuvant such as potassium permanganate, sodium chlorate and potassium chlorate, sodium nitrate, the potassium nitrate are formed.The mode that the employing liquid spraying applies or the pressed powder stirring applies applies combustion adjuvant.Liquid spraying applies and uses liquid combustion adjuvant, and its type that sprays is equably pressed in the preceding deinked sludge; Pressed powder stirs to apply and uses pressed powder state combustion adjuvant, is to press preceding deinked sludge evenly to mix on combustion adjuvant and type by mixer.
Low melting point combustion adjuvant in the combustion adjuvant decomposes during the ignition temperature of low ignition point composition in mud and emits oxygen, the accelerate sludge oxidation, and the low ignition point component burning of catalysis mud is even also can be lighted the low ignition point material in the mud when not drying fully as yet; The high-melting-point combustion adjuvant decomposes successively under 350 ℃～600 ℃ different temperatures and emits oxygen, produces strong combustion-supporting effect; The scarifying agent makes mud outwards bulk internally, produces oxygen in the inside of dewatered sludge, promotes inner sludge incineration, makes the abundant after-flame of mud.Some auxiliary agents in the combustion adjuvant have deashing effects such as the crock of preventing deposits, the catalysis crock burns, impel that crock comes off simultaneously.The sodium that decomposites after the burnings such as the sodium chlorate in the combustion adjuvant, sodium nitrate, potassium chlorate, potassium nitrate, potassium cationic are attached to the boiler tube wall surface, can prevent the crock deposition, thereby and can make and accumulate the abundant oxidation completing combustion of crock, make the hard crock crack, become loose, the nitrogen oxide, the sulfur dioxide gas that produce in sodium nitrate, potassium nitrate combustion back very easily come off under impacting.Crock generation chemical reaction on combustion adjuvant and the heating surface in addition, even make the volatile component that decomposes also can catching fire under the environment of high humility, make the carbon in the crock and carbide becomes carbon monoxide and carbon dioxide vapors away, reduced the content of carbon and carbon compound in the flue gas.The multistage composite combustion adjuvant has guaranteed that the burning initial stage do not have black smoke, does not almost have remaining black carbon in the combustion residue, has improved the burn-off rate of mud.
3, extrusion modling.
To dewater, deinked sludge is pressed or formed by extrusion and tension, it is become satisfy combustion requirements, and have type pressure mud thermal mechanical strength, that definite geometry is arranged that does not disintegrate, do not cave in cold mechanical strength not damaged in handling process and the burning process.
The moulding of deinked sludge can be used the make-up machine extrusion modling again after going out dewaterer; Also dehydration and moulding can be united two into one, the dewaterer that adopts band moulding function is finished dehydration and moulding with the dehydration of the wet mud of deinking elder generation, reshaping on same machine.Embodiment uses make-up machine to carry out extrusion modling.
Type presses mud to have epigranular, shape is regular, size is consistent, porosity can strict control, reactivity without the sludge bulking of type pressure by force, can make things convenient for advantage such as upgrading optimization in the type pressure process.The thin and thick of type pressure mud bed coal charge in combustion furnace, gap, resistance etc. are all more even, help evenly separating out of volatile matter, for burning provides good condition.Type presses the too small meeting of porosity of mud to make burning difficulty or incomplete combustion, excessively then causes the sludge incineration time too short and have to " eat soon soon tell " is unfavorable for stablizing the siege temperature, and the heat loss that slag is taken away also increases.Adopt the machine type to press, the control appropriate porosity of science as required accomplishes not only to guarantee that burning fully but also metastable firing duration can be arranged.Type presses the reactivity of mud to be significantly improved, and is beneficial to burning.When the sludge incineration performance is not good, such as mass dryness fraction below 30%, and the content of organics in the while solid is lower than at 40% o'clock, can in type pressure process, adopt forming techniques such as coal blending, outer doping, Fast Heating, hot pressing, mud is produced tangible viscosity reduction, hinders upgrading optimization functions such as melting, improve heat endurance, raising mechanical strength, it can be grilled thoroughly, do not produce flying dust again, ash content carbon obviously reduces, to satisfy the requirement of burning.
Through the deinked sludge after the type pressure enough cold and hot state mechanical strengths should be arranged.It is the cold conditions mechanical strength that type is pressed mud mechanical strength at normal temperatures, and the mechanical strength under the furnace temperature is hot mechanical strength.Because the deinking type presses mud a handling process to be arranged going into the stokehold, can stand repeatedly to collide, rub, therefore, type presses mud that enough cold mechanical strengths need be arranged.Consider the employing bed furnace, its bed of material height, wind or quantity of steam is big, the bed of material such as can move down at characteristics to temperature gradually up to 1000--1300 ℃ and during burning, therefore, the mechanical forces that the requirement type produces when pressing mud can at high temperature stand the friction of washing away, producing when the bed of material moves down, the ash discharge of pressure, the high velocity air of the bed of material etc., type presses mud that enough thermal mechanical strengths should be arranged.
According to different mud and purposes, type presses mud shape, size also inequality, and the shape of moulding can be mosaic type or spheroid shape or ovum type or pillow type or circle honeycomb type or square honeycomb type or water chestnut cylindricality or the like.
Influencing type presses the technological factor of sludge quality a lot.As: the composition of the granularity of mud, water content, ash content and composition, fiber content, printing ink content, briquetting pressure or the like.And reciprocation is arranged between each factor, we can say that type is pressed and is polynary compound function relation between sludge quality and factors.Therefore, should take all factors into consideration the influence of factors, just can produce the type that share and press sludge fuel moulding process.During the deinked sludge moulding, owing to particle bonds together under the effect of residual ink easily, and press closely, its required briquetting pressure is all not too big.When increasing briquetting pressure, the compactness extent of particle increases, and type presses sludge intensity to improve thereupon; But when moulding pressure increased to a certain degree, type pressed sludge intensity then to change not quite.The briquetting pressure scope of general make-up machine is controlled at 100-5000N/cm
2
4, burning.
The deinked sludge of compression moulding is burnt in common grate firing boiler continuously.When deinked sludge and other fuel, such as with fire coal during with certain proportion mixed combustion, fire coal can be after dehydration, sneak into before the forming step, also can be behind forming step, sneak into when dropping into combustion furnace.Since in the deinked sludge S constituent content seldom, so SO during burning
2It is much smaller to pollute common relatively fire coal, when being mixed with fire coal in the deinked sludge, is that the SO when reducing fired coal combustion pollutes in the burning, and the residue aqueous emulsion after burning with deinked sludge sprays to handle to incineration tail gas and prevents secondary pollution.This is very high because of Ca element in the deinked sludge ash and O constituent content, and respectively up to 9.18% and 18.30%, having of CaO is beneficial to desulfurization, with its aqueous emulsion incineration tail gas sprayed processing and can receive the good antifouling effect.
Deinked sludge complicated component, particularly moisture height, the deinked sludge water content of process one-level press filtration reaches 45-80%.Filer content is very high in the deinked sludge, wherein based on powdered whiting and china clay.Butt deinked sludge mineral the ash content of coal is up to 20-60%, and remaining is an organic matter, mainly is fiber 25-40% and a spot of lignin 1-5% and printing ink 1-5%.Know from relevant constituent analysis, except that C, H, three kinds of essential elements of O, also contain elements such as N, Ca, Al in the over dry deinked sludge.Wherein Ca and Al constituent content are respectively up to 6.2% and 0.97%, and both all derive from papermaking filler; C element and H element are mainly derived from the fiber in the mud.
The content of ashes of deinked sludge and the scope of high grey carbon are more identical, about 45%; The volatile matter of deinked sludge is very high, reaches 43%, and this has determined the characteristic that it is lighted easily.The caloric value of deinked sludge is very low, and it is very big influenced by moisture, moisture is that the calorific value of 5% dried deinked sludge is 1850Kcal/Kg, when moisture is 74%, it is zero that the Regong of mud is offered, the moisture oven dry that the heat that produces when the deinked sludge of moisture content 74% burns in other words can only carry it at most, the deinked sludge that is higher than this moisture content then needs to consume external thermal source could dry it.The lime-ash softening temperature ST of deinked sludge is more moderate, is 1350 ℃, can satisfy the requirement of boiler slag removal.
The These characteristics of deinked sludge composition has determined the following burning feature of deinked sludge, and its burning is divided into following four-stage:
Phase I, water evaporates stage:
Send into mud in the stove and be subjected to the convection current radiation heat release of high-temperature flue gas and heat up with the transmission of heat by contact of red-hot coke, lime-ash, the moisture in the fuel is start vaporizer just, until oven dry fully.
Moisture is the non-combustible impurity in the deinked sludge, and its content is very big, from 30% to 80%.Moisture increases in the mud, has reduced the content of combustible component relatively, has reduced the caloric value of mud.In addition, the existence of moisture brings many adverse effects also for the economy and the security of boiler operatiopn, as causes catch fire postponements, fire box temperature of mud to reduce, strengthened the possibility of heated surface at the end of boiler gas-side corrosion and stifled ash, thermal loss that the increase flue gas is taken away and air-introduced machine power consumption etc.Therefore, moisture also is the harmful components during deinked sludge burns.But sometimes in order to prevent that dust from flying upward, reducing slagging scorification, improve to ventilate, fuel savings, it is still beneficial to keep suitable moisture.
The moisture of deinked sludge is divided into free water and in conjunction with water.Free water is mechanically to adsorb or attached on the mud, it can be removed with machinery or the mode that is heated to more than 100 ℃; And be the water that combines with mineral matter in the form of chemical combination and the mud and fiber in conjunction with water, i.e. the crystallization water, this part water is to remove with the method for machinery, if take to heat dehydration, then needs to reach the temperature more than 200 ℃.In the sludge incineration operation, the more important thing is how to remove free water as much as possible, result of experiment shows that deinked sludge is at 300kg/cm
2Mass dryness fraction can reach 75% under the pressure, for practical operation, if the mass dryness fraction of deinked sludge can be remained on more than 50%, so just the adverse effect of moisture can be reduced to very low level.
Second stage, volatile matter are separated out and dried mud forms the stage:
Mud after the oven dry continue in stove heat temperature raising, when reach volatile matter separate out temperature the time, the volatile matter in the fuel is just separated out in a large number.Different fuel has the different temperature of separating out, and generally is about 130-400 ℃.When separating out, volatile matter just formed the dewatered sludge of porous.
More than two stage mud all be in the heat absorption state, for volatile matter and dewatered sludge fire burns create conditions, thereby also can be generically and collectively referred to as preparatory stage before the sludge incineration.Because deinked sludge contains moisture and volatile matter is all very high, often appearance produces a large amount of water vapours and volatile matter simultaneously, forms black smoke.The present invention has adopted the multistage composite combustion adjuvant to eliminate smoke, even thereby make the volatile component that decomposes also can eliminate black smoke by catching fire in the environment of high humility.
The combustion phases that catches fire of phase III, volatile matter and mud:
Along with the further rising of mud temperature, reach certain density gaseous state volatile matter, mainly be hydrogen, carbon monoxide and the various hydrocarbon fire burns that when running into oxygen, just taking the lead in, emit heat, make combustible granules continue heat temperature raising.When the fast after-flame of volatile matter, mud has reached red-hot rubescent state, about 600-700 ℃, has then just entered the stage of fierce burning.
For combustion process can successfully be carried out, will guarantee that at first fuel can in time stably catch fire, that is fuel to be heated to ignition temperature.But mud is a kind of mixture that comprises various different complex compounds, can not be as some chemical pure combustible, definite ignition temperature is just arranged in certain medium, and its ignition temperature is not to be a certain fixed value in other words, but change within the specific limits.The technology that deinked sludge produces is different with the kind of paper making raw material, and its ignition temperature is also inequality, and changes with the content of various compositions.The ignition temperature of deinked sludge is decided by how many compositions of volatile matter reaches, the many ignition temperatures of volatile matter are just low, and its dried mud to contain porosity also high, thereby expanded the surface area of dried deinked sludge burning greatly, relatively accelerate burning velocity, improved the completeness of burning.The volatile matter content of deinked sludge is at 30-45%, be equivalent to jet coal and brown coal, exceed much than the volatile matter content of marking coal, this is the good condition of having created of lighting of moisture deinked sludge, because the fuel that volatile matter is high not only catches fire rapidly, and is easy to after-flame.
Fuel is heated to the needed heat Q of ignition temperature
ShBe Q
Sh=Q
Rl+ Q
Kq+ Q
FjQ wherein
Rl: before arriving ignition temperature, the caloric receptivity of fuel, kcal/kg; Q
Kq: before arriving ignition temperature, the caloric receptivity of air, kcal/kg; Q
Fj: the decomposition heat of volatile matter, kcal/kg.
This shows that the caloric receptivity that catches fire of mud is inversely proportional to the air themperature that enters burner hearth, promptly air themperature is low more, and the caloric receptivity that catches fire is many more; Then be directly proportional with mud ash content, moisture and volatile matter content, promptly the mud content of ashes is high more, wet more, volatile matter is many more, and the caloric receptivity that catches fire is just many more.This part heat is considerable, can reach more than 1/3 of mud caloric value sometimes, and this is very disadvantageous to sludge incineration.
The deinked sludge volatile ingredient separate out relation such as following table with temperature:
| |
1 | 2 | 3 | 4 | 5 |
| Temperature | 500℃ | 600℃ | 700℃ | 800℃ | 900℃ |
| Volatile matter (% butt) | 29.0％ | 34.0％ | 36.7％ | 38.6％ | 43.4％ |
| Volatile matter separate out ratio | 66.8 | 78.3％ | 84.6％ | 88.9％ | 100％ |
As seen mud has just been separated out 66.8% of volatile matter in the time of 500 ℃, and this is the reason that deinked sludge can catch fire when lower temperature.Experiment shows that deinked sludge just can catch fire at 300 ℃.
Quadravalence section, lime-ash form the stage:
Along with the burning of volatile matter and dried mud, lime-ash also progressively forms.Because initial required heat and the air of burning always derives from the outside; that is the burning of dried mud particle is always from outward appearance to inner essence carried out; thereby behind the burning certain hour; dried mud outside is just wrapped up by one deck " grey clothing " and is more and more thicker; and the fusing back formation one deck duricrust under the high temperature action of being everlasting; stop dried mud core to contact, make burning carry out slowly unusually with the further of air.Like this, when unburnt dried mud falls into ashcan, just caused unburned carbon loss, because the deinked sludge dust burdening is very high, this situation is particularly serious.Thereby in order to reduce this loss as far as possible, the present invention has applied combustion adjuvant, produces oxygen in the inside of dewatered sludge, improves the burn-off rate of fuel.
The flow process of the wet deinking sludge incineration application example of embodiment is referring to accompanying drawing.
Application example 1:
Referring to Fig. 1, this application example is to adopt the liquid spraying mode to apply the combustion adjuvant burning.
Its handling process is: mass dryness fraction is that the deinked sludge of 5-10% is sent into spiral via conveyer belt 1 and extracted machine 2, enter double shaft mixer 3 then and carry out mechanical dehydration, mix with the combustion adjuvant of combustion adjuvant spray thrower 4 ejections the dehydration back, enter make-up machine 5 compression mouldings again, transport boiler 7 to by means of transport 6 and burn.Process conditions are: going out spiral, to extract the mud mass dryness fraction of machine be 50%, the combustion adjuvant consumption be over dry mud 2%, spray combustion adjuvant strength of fluid is 20%, to press pressure be 2000N/cm to type
2This example uses deinked sludge burning separately, and sludge calorific value is 7.75MJ/Kg, and mud catches fire 1 minute 35 seconds the time after entering burner hearth, and the intensity of a fire becomes prosperous in the time of 2 minutes 00 second, is popular in the time of 6 minutes, and the residue color is a canescence.
Application example 2:
This application example is deinked sludge and coal mixed combustion, without combustion adjuvant.
The handling process of this example is referring to Fig. 2, and 8 for mixing coal-fired operation among the figure.With example 1 fewer combustion adjuvant apply step, increased and coal-fired mixed processes.Coal-fired mixing can be before the mud moulding, also can be before the moulding after-combustion.Before this example was placed on moulding, deinked sludge and coal mixed proportion are that calorific value is the over dry deinked sludge 50% of 7.75MJ/Kg: calorific value was the over dry coal 50% of 30.10MJ/Kg.Other handling process and the process conditions of this example are same as example 1.Mud catches fire 1 minute 40 seconds the time after entering burner hearth, and the intensity of a fire becomes prosperous in the time of 2 minutes 15 seconds, be popular in the time of 6 minutes, and the phenomenon basically identical when burning separately with deinked sludge, the residue color is a grey, color is dark during than the independent burning of mud.
Claims (6)
1, a kind of method of removing ink from waste paper by firing is characterized in that: with the wet sludge modification of deinking is easy burnt fuel, adopts common grate firing boiler to burn, and described incinerating method may further comprise the steps:
A, dehydration, the wet sludge dewatering of deinking with mass dryness fraction＜42% makes its mass dryness fraction reach 42～75%;
B, apply combustion adjuvant, in the dehydration deinked sludge, add have at least the low ignition point material that can make in the mud in high humidity environment, light, combustion-supporting, and the combustion adjuvant of one of smoke elimination, scarifying, deashing function;
C, moulding, the back deinked sludge that will dewater carries out extrusion modling, makes it become the moulding mud that satisfies combustion requirements;
D, burning are burnt the deinked sludge of extrusion modling in common grate firing boiler continuously.
2, the method of a kind of removing ink from waste paper by firing according to claim 1, it is characterized in that: described combustion adjuvant adopts the multistage composite combustion adjuvant, its composition contains low melting point combustion adjuvant and high-melting-point combustion adjuvant at least, and scarifying agent, the mode that applies of described combustion adjuvant adopts liquid spraying to apply or pressed powder stirs the mode that applies, it is that combustion adjuvant with liquid state sprays in the deinked sludge before type is pressed equably that described liquid spraying applies, and described pressed powder stirs and applies is to press preceding deinked sludge evenly to mix with type the pressed powder state combustion adjuvant that applies by mixer.
3, the method for a kind of removing ink from waste paper by firing according to claim 1 and 2, it is characterized in that: described dehydration adopts the secondary dewatering process, at first deinked sludge is pressed dry the mass dryness fraction of 25-30% with belt filter press, with spiral dewater or roll-type press drier deinked sludge is continued to extract the mass dryness fraction of 42-75% then, the waste water that second level dehydration produces is sent the first order back to and is filtered again.
4, the method for a kind of removing ink from waste paper by firing according to claim 3 is characterized in that: described extrusion modling step is used the make-up machine moulding, and the briquetting pressure scope of make-up machine is 100-5000N/cm
2, moulding be shaped as a kind of in incendive mosaic type, spheroid shape, ovum type, pillow type, circle honeycomb type, square honeycomb type, the water chestnut cylindricality.
5, the method for a kind of removing ink from waste paper by firing according to claim 1, it is characterized in that: described dehydration and forming step lump together and carry out, the dewaterer that adopts band moulding function is with the dehydration earlier of the wet mud of deinking, and reshaping is a kind of shape in incendive mosaic type, spheroid shape, ovum type, pillow type, circle honeycomb type, square honeycomb type, the water chestnut cylindricality.
6, the method for a kind of removing ink from waste paper by firing according to claim 1 is characterized in that: mixing fire coal after the described dehydration or in the mud behind the forming step and carry out moulding or burning again, is the SO that produces when reducing fired coal combustion in its combustion step
2Pollute, the spray that incineration tail gas reduces pollution is handled with the deinked sludge residue aqueous emulsion after the burning that contains a large amount of CaO.
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Cited By (1)
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| CN102269418A (en) * | 2011-05-18 | 2011-12-07 | 桑洪忠 | Method for utilizing papermaking sludge to realize desulfuration, denitrification and coal conservation of circulating fluid bed |
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| CN103160295A (en) * | 2011-12-14 | 2013-06-19 | 葛永昌 | Method of sludge destructive distillation energy conversion treatment |
| CN104359111B (en) * | 2014-11-28 | 2016-09-14 | 合肥工业大学 | One way of life drying garbage incinerator |
| CN105972610A (en) * | 2016-05-30 | 2016-09-28 | 戴道国 | Collaborative mixed burning method for large-scale treatment |
| CN107619169A (en) * | 2017-09-04 | 2018-01-23 | 江苏理文造纸有限公司 | A kind of method of slurrying deinked sludge recycling |
| CN109336352A (en) * | 2018-11-05 | 2019-02-15 | 李舒馨 | A kind of method for sludge treatment |
| CN111457394B (en) * | 2020-03-26 | 2022-09-16 | 杭州蓝禾新能源工程技术有限公司 | Boiler sludge blending combustion device |
| CN114478050A (en) * | 2021-12-23 | 2022-05-13 | 王梓远 | Sludge ceramsite and preparation method thereof |
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| US5705073A (en) * | 1992-12-24 | 1998-01-06 | Austrian Energy & Environment Sgp/Waagner-Biro Gmbh | Method for the disposal of excess sludge |
| CN1285392A (en) * | 1999-08-24 | 2001-02-28 | 秦泰君 | Solid fuel and process for preparing the same |
| CN1302973A (en) * | 2001-02-01 | 2001-07-11 | 昆明理工大学 | Top blowing of oxygen, direct fusion and gasification, and combustion for life garbage and its technology for electric generation |
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| US5705073A (en) * | 1992-12-24 | 1998-01-06 | Austrian Energy & Environment Sgp/Waagner-Biro Gmbh | Method for the disposal of excess sludge |
| CN1285392A (en) * | 1999-08-24 | 2001-02-28 | 秦泰君 | Solid fuel and process for preparing the same |
| CN1302973A (en) * | 2001-02-01 | 2001-07-11 | 昆明理工大学 | Top blowing of oxygen, direct fusion and gasification, and combustion for life garbage and its technology for electric generation |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102269418A (en) * | 2011-05-18 | 2011-12-07 | 桑洪忠 | Method for utilizing papermaking sludge to realize desulfuration, denitrification and coal conservation of circulating fluid bed |
| CN102269418B (en) * | 2011-05-18 | 2013-02-20 | 桑洪忠 | Method for utilizing papermaking sludge to realize desulfuration, denitrification and coal conservation of circulating fluid bed |
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