CN102517117B - Method for preparing alternative fuel for cement kiln by using waste paint slag - Google Patents
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Abstract
A method for preparing alternative fuel for cement kiln by using waste paint slag. The method comprises the following steps: a) blending paint slag with water content greater than 55% into a paint slag suspending liquid; b) depriving solid impurities in the paint slag suspending liquid; c) stirring and mixing the paint slag suspending liquid with solid impurity deprived and modifier to prepare modified paint slag; d) dehydrating the modified paint slag to obtain solid paint slag; e) fragmenting dehydrated solid paint slag; and f) stirring and mixing the fragmented paint slag and impregnating agent to obtain the alternative fuel. For paint slag with water content less than 55%, step (e) is the start point. The invention fully utilizes calorific value of organic substances in the waste paint slag to prepare the alternative fuel with single property and stable calorific value for cement kiln, so as to solve a problem of direct burning disposal of waste paint slag as well as a fuel problem caused by high energy consumption in the cement industry.
Description
Technical field
The present invention relates to a kind of method of utilizing the semi-solid state industrial waste to prepare alternative fuel, relate to particularly a kind of method of utilizing waste paint slag to prepare the cement alternative fuel.
Background technology
Definition: waste paint slag involved in the present invention is that automobile (or workpiece) adds flocculation agent at a large amount of over-sprayed paint fogs that produce in spraying process and organic solvent gas after recirculated water absorbs, after making waste gas and over-sprayed paint fog and recirculated water fully contacting, then add slag former to form.In 08 edition " national Hazardous Waste List ", waste paint slag belongs to HW12 class dyestuff coating waste.
The main chemical compositions of waste paint slag is close with the paint composition used, and according to the parts of spraying are unusual, by being coated with membrane substance, pigment, solvent and a small amount of scum silica frost medicament, forms.Wherein be coated with membrane substance and be generally synthetic resinoid, mainly contain Synolac, acrylic resin, epoxy resin, vibrin and aminoresin etc.; Pigment and scum silica frost medicament kind are various, and each producer selectes according to actual Production requirement, are difficult to define; Solvent is generally boiling point at the aliphatic hydrocarbon below 250 ℃, aromatic hydrocarbon (benzene class), pure ethers, ester class, ketone etc. and water (water-miscible paint); In addition auxiliary agent (additive) be widely used the complicacy that has increased the waste paint slag composition, the disposal difficulty of waste paint slag is increased.
Waste paint slag is due to the production technique difference of each producer, its water ratio is also different, generally between 70%-85%, some paint slag water ratio even reach more than 90%, in addition due to the carelessness on waste management, causing people in waste paint slag is that the impurity that adds is also more, such as gloves, tatter, screw and nut etc. are arranged, has strengthened the disposal difficulty of waste paint slag.
Traditional waste paint slag is disposed the same with other trade waste, the mode of all utilizing landfill and directly burning, but utilize these two kinds of methods all can cause secondary pollution to environment: landfill can cause the pollution of underground water and soil, directly burn and can cause topsoil owing to producing a large amount of black smokes.In the legislations of environmental protection of country, having stipulated can not landfill, and direct burning elementary disposal options as a comparison, also being substituted gradually.
The treatment technology of waste paint slag mainly contains paint slag regeneration techniques, paint slag pyrolytic incineration technology etc. at present.
(1) paint slag regeneration techniques
The patent of invention that the patent No. is 200710146302.X discloses a kind of method of regeneration waste painting slag of industry, the method is that the paint slag is after the method for physics dehydration is removed the moisture more than 90%, add again a certain proportion of chemical water-removal agent, remove remaining moisture, paint slag after aforesaid method is processed is as the raw material of regeneration, then add after a certain amount of pigment powder fully mixing and stirring, and be ground to fineness and reach 20 μ m, finally, with Amino Polyester resin levelling gloss, obtain raw lacquer again.The paint slag that this patented technology adopts or be the pollution-free fresh paint slag (not adding flocculation agent and slag former) produced in 3 days or be the fresh paint slag of the interpolation flocculation agent that produces in 24 hours.
The patent of invention that the patent No. is 200710049873.1 discloses a kind of recovery method of thermoplasticity coating material waste paint slag, the method is at first to utilize the moisture of the method for oven dry except coating removal slag surface, then remove after filtration impurity, with organic solvent will paint slag dissolve to disperse, with dewatering agent will paint pulp water decompose, with oil-repellent except degreasing, with flow agent, carry out the levelling processing, with Ricinate, will paint colo(u)rant dispersion in slag, will paint pigment in slag with the arrangement auxiliary agent and rearrange flatly, obtain the coating that can reuse.
The patent of invention that the patent No. is 200610068764.X discloses a kind of paint slag regenerating process, the method comprises following operation: organic solvent mixes with paint slag, homogenous disperse, underpressure distillation, pulverizing filter, adjust viscosity, the packing of product, makes paint slag be regenerated as qualified paint.
Paint slag regeneration techniques has higher purity and active requirement to original waste paint slag, need to after generation, process in the short period of time and can be used in coating material, therefore regeneration techniques generally all requires with fresh waste paint slag, and existing waste paint slag impurity is many, often be mingled with as impurity such as gloves, cloth, nuts, the overwhelming majority paints slags and has deposited for some time, is difficult to reach the requirement of regeneration techniques; Paint slag regeneration techniques need to add a large amount of chemical reagent as organic solvent, degreaser, water-removal agent, pigment etc., and the partial regeneration technology also needs the complicated operations such as rectifying, and complex process, need extra additive types more; The paint slag of the equal corresponding particular type of each paint slag regeneration techniques, and existing waste paint slag kind is numerous and diverse, existing any paint slag regeneration techniques can't be realized the paint slag of all types is regenerated; Paint in addition regenerated paint that the slag regeneration techniques obtains general be oil paint, and be meet the requirement of environmental protection in automobile (or workpiece) spraying process, now advocate to use energetically water-borne coatings, so the popularization of regenerated paint and use and will be subject to larger limitation.
(2) paint slag pyrolytic incineration technology
Tsing-Hua University's science of heat and key lab of the power engineering the Ministry of Education have built electric furnace Pyrolysis Experiment platform in batches and have obtained characteristics of sludge pyrolysis products.At pyrolysis gas outlet, processing is lighted at place, and during flame stabilization, at the under meter afterbody, 8 places gather pyrolysis gas, carry out gas chromatographic analysis.Rear pyrolysis residue and condensed tar are carried out to sampling analysis Deng stove is cooling.
Experimental result shows works as pyrolysis temperature at 750 ℃, and when pyrolysis time surpasses 120min, pyrolysis is carried out thoroughly.The combustion gas quality that pyrolysis produces accounts for 40% of slag quality, the about 30MJ/m3 of calorific value; The residual residue quality accounts for 20%, and the about 18MJ/kg of calorific value also has part tar in addition.
According to experimental result, paint slag, after high temperature pyrolysis, produces gas heating value high, is small molecules substantially, burns relatively clean.There is not the problem of cohering in pyrolysis residue simultaneously, can send into burner hearth with coal.Therefore, it is rational processing paint slag by the mode of pyrolytic incineration.Pyrolytic process adopts discontinuous charging, by electrothermal oven, provides the pyrolysis energy, the pyrolysis that hockets of two electric furnaces.The pyrolysis combustion gas is directly passed in burner hearth, enters burner hearth by opening for feed together with after pyrolysis residue and coal mix to be burned, the flue gas that burning produces by flue-gas purification treatment device after by smoke stack emission.
Above report can be consulted: Qian Yuanji, Wu Zhansong. the pyrolysis characteristics of paint slag and pyrolytic process. and Tsing-Hua University's journal (natural science edition), 2008,48 (2): 236-239.
Paint slag pyrolytic incineration technology is applicable to the waste paint slag of water ratio 30% below, and existing waste paint slag water ratio all very high (between 70%-85%, the highest can up to 90%) is not suitable for adopting this technology disposal; This technology also rests on laboratory stage at present in addition, has not met corresponding technical scale example report.
(3) utilize the direct incineration technology of cement kiln
Utilize cement kiln disposal of commercial waste, domestic refuse, poisonous and harmful solid waste that its unique advantage is arranged.Because the dry-process cement rotary kiln volume is large, high temperature, Heat stability is good, as offal treatment, neither increase land seizure, the investment less, alternative part of fuel, be the solid waste processing mode that current innoxious degree is the highest, effects of energy saving and emission reduction is the most remarkable, comprehensive utilization of resources is best, economy is optimum again.In the developed country such as American-European, Japanese, be widely used, Technology is very ripe.In China, the ground such as Beijing, Shanghai, Guangzhou have also progressively started to utilize this Technology.
Utilize the direct incineration technology of cement kiln because the water ratio of original waste paint slag is higher, when directly carrying out incineration disposal, the ununiformity of high-moisture percentage and charging can have a strong impact on the stability of cement kiln operating mode, especially along with the increase of disposal amount, this impact is also more serious, unstable due to the kiln condition, cause the burning disposal amount not high in addition.
The report of fuel has as an alternative:
The patent of invention that the patent No. is 200710014844.1 discloses a kind of method of utilizing the clay standby bituminous coal alternative fuel in paper waste pond, it is main raw material that the method be take the pond mud that paper mill effluent process to produce, by pond mud dehydrated, NaOH solution soaking, pulverizing, baking make a kind of fuel that can replace bituminous coal, add coal slime and make tamanori and can prepare shaped fuel.
The patent of invention that the patent No. is 92103704.X discloses a kind of method of utilizing the briquettes with sludge of biochemical sludge making, the method be by the excess sludge of municipal sewage plant after drying bed dehydration, making its water ratio is 40%-50%, then with raw coal, loess, mix in proportion, add again carbide slag, the agent that eliminates the unusual smell, after fully mixing, make moulded coal by the method for existing production of shaped coal.
But relate to utilize waste paint slag for the preparation of the relevant report of the alternative fuel of cement kiln so far there are no report.
Summary of the invention
The object of the present invention is to provide a kind of method of waste paint slag for the preparation of the alternative fuel of cement kiln of utilizing, take full advantage of the calorific value of organic substance in waste paint slag, prepare single property, the stable cement kiln alternative fuel of calorific value, to solve the difficult problem of the direct incineration disposal of waste paint slag, solve Cement industry because of the high fuel problem produced that consumes energy simultaneously.
For achieving the above object, method provided by the invention can be divided into two kinds for the water ratio of raw material paint slag:
When the water ratio of raw material paint slag is less than 55%, water ratio is less than to 55% paint slag and is crushed to the granularity that is less than 5mm, paint slag and soaker after fragmentation are uniformly mixed, and obtain alternative fuel; Described soaker is loose and has the material of bigger serface, as one or more of sawdust, wood chip, cavings; The 7%-15% that the addition of soaker is broken rear paint slag amount; The granularity of soaker is less than 8mm.
When the water ratio of raw material paint slag is greater than 55%, carry out in the steps below:
A) water ratio is greater than to 55% paint slag allotment lacquering slag suspension liquid;
B) except the solid impurity in coating removal slag suspension liquid;
C) remove the paint slag suspension liquid of solid impurity and properties-correcting agent and stir and be mixed, make the modified paint slag; Described properties-correcting agent is for containing calcareous or siliceous material;
D) the modified paint slag is dewatered, obtained the paint slag of solid;
E) the solid paint slag fragmentation after dewatering;
F) paint slag and the soaker after fragmentation is uniformly mixed, and obtains alternative fuel; Described soaker is loose and has the material of bigger serface.
In described method, the suspension liquid water ratio of step a is 85%-90%.
In described method, the waste water that adds fresh water (for difference waste water described later, normal water being defined as to fresh water) or steps d to deviate from during step a allotment suspension liquid.
In described method, the solid impurity of step b is the impurity of particle diameter more than 1cm.
In described method, the properties-correcting agent of step c is for containing calcareous and siliceous pulverulent material, for example garbage flying ash, cement slurry or the two mixture, and the granularity of pulverulent material is less than 150 orders; The addition of properties-correcting agent is the 3%-8% that removes paint slag suspension quality after impurity.
In described method, the paint slag water ratio of the solid that steps d obtains is less than 55%.
In described method, the paint slag is crushed to the granularity that is less than 5mm.
In described method, soaker is loose and has the material of bigger serface, as one or more of sawdust, wood chip, cavings; The 7%-15% that the addition of soaker is broken rear paint slag amount; The granularity of soaker is less than 8mm.
The effect of invention is:
1) the present invention takes full advantage of the high heating value of waste paint slag, has prepared alternative fuel.
2) through the modification to the paint slag, the mechanical dehydration effect of paint slag has had obvious improvement, and after dehydration, paint slag water ratio can be reduced to 50% left and right by 85% original left and right, for the preparation alternative fuel provides safeguard.
3) the paint slag fully mixes with soaker after fragmentation, has realized paint solid impurity particle dispersion effect preferably, makes its loose, homogeneous that becomes when further reducing the alternative fuel water ratio, is convenient to storage, transportation and incineration disposal.
The accompanying drawing explanation
Fig. 1 is process flow diagram of the present invention.
Embodiment
1) selection of waste paint slag
The material that the present invention adopts is that automobile (workpiece) adds flocculation agent at a large amount of over-sprayed paint fogs that produce in spraying process and organic solvent gas after recirculated water absorbs, after making waste gas and over-sprayed paint fog and recirculated water fully contacting, then the paint slag that adds slag former to form.Such waste paint slag is due to the difference that produces producer, character, viscosity differ greatly, the dehydration difficulty is also different, while being dewatered, water ratio is generally between 70%-90%, the a small amount of waste paint slag of part (waste paint slag of viscosity little Yi dehydration) is after simple directly filter-press dehydration, and water ratio can reach in 55%.The butt calorific value of these waste paint slags is generally all more than 5000kcal/kg.
2) processing step is described
A) at first waste paint slag is poured in stirred pot, it is deployed into to the suspension liquid that water ratio is 85%-90% and fully stirs.Purpose is to make to paint slag can utilize natural gravity to flow smoothly.
If need add liquid diluting during allotment, the liquid added can be fresh water, can be also the waste water of deviating from steps d mechanical dehydration process.
B) deployed waste paint slag suspension liquid is carried out to removal of impurities, remove the impurity that the blob of viscose of particle diameter more than 1cm, cloth, gloves, nut etc. may contain.
C) the paint slag suspension liquid after removal of impurities utilizes handling equipment to be delivered to be mixed and is mixed with properties-correcting agent in tank and fully stirs.The purpose that properties-correcting agent adds is in order to reduce cohesiveness mutual between the waste paint slag particle, improves its mechanical dehydration effect.Properties-correcting agent is the pulverulent material following containing calcareous, siliceous more and 150 order granularities, preferentially chooses the combination of garbage flying ash, cement slurry or two kinds.The adding proportion of properties-correcting agent generally accounts for the 3%-8% of paint slag suspension quality after removal of impurities.
D) the modified paint slag be mixed is carried out at normal temperatures to mechanical dehydration (as press filtration, the solid-liquid separation known technology such as filter), remove the approximately water more than 90%, obtain the paint slag solid of water ratio between 40%-55%.This solid is circle (side) shape or irregular type pie, has certain hardness.
E) the paint blob of slag after dehydration is delivered to crusher and carries out fragmentation procedure, the paint slag that will dewater is crushed to below 5mm.
F) the paint slag after fragmentation and soaker are carried out to abundant mix and blend, the material obtained after stirring is alternative fuel.The purpose that adds of soaker is to play dissemination, makes alternative fuel be convenient to store and transportation.The material that soaker is generally is loose, specific surface area is large, dry, preferentially choose the combination of sawdust, wood chip, cavings and above three kinds of materials.The granularity of soaker is generally below 8mm, and the adding proportion of soaker is generally the 7%-15% of broken rear paint slag amount.
G) waste paint slag can obtain alternative fuel through above-mentioned steps, and this fuel is the discrete particle shape, is convenient to carry, and contacts fully with warm air in burning process, and efficiency of combustion is high.
When the present invention adopts the original waste paint slag of water ratio between 70%-90% to prepare alternative fuel, processing step is a-f, and water ratio prepares alternative fuel 55% with interior original waste paint slag, only needs e, f two steps to get final product.
Embodiment
A) choose waste paint slag, be poured in the stirred pot with stirrer and stir evenly, water ratio is 87.7% after testing, without external adding water, allocates.
B) utilize the effect of self gravitation to enter in impurity removing equipment through a blanking groove paint slag suspension liquid after stirring, the impurity removing equipment of selecting in this example is vibratory screening apparatus, and mesh size is 1.5cm, and the impurity level of removing accounts for approximately 3% of paint slag original weight.
C) the paint slag suspension liquid after removal of impurities enters a buffer tank, then utilizes handling equipment that it is delivered to the tank that is mixed; Properties-correcting agent joins in the tank that is mixed simultaneously.In this example, handling equipment is selected spiral pump, and properties-correcting agent is selected garbage flying ash; The addition of properties-correcting agent is paint slag suspension liquid quality 4.5%.
D) the modified paint slag be mixed is carried out to dehydration operation.The dewatering type adopted in this example is filter press technique.After filter-press dehydration, paint slag water ratio is 44.21%.
E) the paint slag after dehydration is delivered to crusher and carries out fragmentation procedure.Paint slag discharging particle diameter after fragmentation is between 1mm-5mm, and the paint slag that wherein is less than the 3mm particle diameter accounts for more than 70%.
F) the paint slag after fragmentation is fully mixed with soaker, reach loose, the finely dispersed effect of paint solid impurity particle.The soaker of selecting in example is sawdust, and mean particle size is in the 5mm left and right, and water ratio is 10.58%, and calorific value is 4290.75kcal/kg, and addition is 10% of paint slag weight.
Through above-mentioned a series of pretreatment operation, the alternative fuel data that obtain are as shown in table 1 below:
| Title | Water ratio (%) | Calorific value (kcal/kg) | Ash content (%) |
| Alternative fuel | 36.95 | 2339.58 | 23.17 |
The alternative fuel physical aspect obtained is stable, homogeneous, loose, not agglomerating, easily stores and carries, and is particularly suitable for utilizing cement kiln to burn.
As can be seen from the above description, though two patented technologies of briquettes with sludge that the clay standby bituminous coal alternative fuel in known paper waste pond and biochemical sludge are made are comparatively approaching with technology of the present invention, but these two technology for material be biochemical sludge, fully different from paint slag character used in the present invention; Find to have added in addition raw coal or coal slime in preparing the technique of fuel from the technical information of these two inventions, all admixture the calorific value fuel higher than mud improve the performance of product, although and the present invention's admixture soaker (can be considered biomass fuel), but admixture its objective is in order to change the waste paint slag physical condition, make to paint that solid impurity particle is loose, homogeneous and not agglomerating, and be not the performance that improves the alternative fuel product (because the calorific value of waste paint slag will higher than the calorific value of soaker).
Claims (6)
1. a method of utilizing the paint slag to prepare the cement alternative fuel, comprise the steps:
A) water ratio is greater than to 55% paint slag allotment lacquering slag suspension liquid;
B) except the solid impurity in coating removal slag suspension liquid;
C) remove the paint slag suspension liquid of solid impurity and properties-correcting agent and stir and be mixed, make the modified paint slag; The combination that described properties-correcting agent is garbage flying ash, cement slurry or two kinds; The granularity of properties-correcting agent is less than 150 orders, and the addition of properties-correcting agent is the 3%-8% that removes paint slag suspension quality after impurity;
D) the modified paint slag is dewatered, obtained the paint slag of solid;
E) the solid paint slag fragmentation after dewatering;
F) paint slag and the soaker after fragmentation is uniformly mixed, and obtains alternative fuel; Described soaker is one or both of wood chip, cavings; The 7%-15% that the addition of soaker is broken rear paint slag amount; The granularity of soaker is less than 8mm.
2. method according to claim 1, wherein, the suspension liquid water ratio of step a is 85%-90%.
3. method according to claim 1, wherein, the waste water that adds water or steps d to deviate from during step a allotment suspension liquid.
4. method according to claim 1, wherein, the solid impurity of step b is the impurity of particle diameter more than 1cm.
5. method according to claim 1, wherein, the solid paint slag water ratio that steps d obtains is less than 55%.
6. method according to claim 1, wherein, paint slag and be crushed to the granularity that is less than 5mm.
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| CN105880261B (en) * | 2016-05-18 | 2017-11-14 | 湖南省小尹无忌环境能源科技开发有限公司 | A kind of resource utilization method for painting slag |
| CN107903980A (en) * | 2017-11-22 | 2018-04-13 | 云南大地绿坤环保科技有限公司 | A kind of method that tar slag is modified |
| CN109681881B (en) * | 2018-12-26 | 2020-07-14 | 天津水泥工业设计研究院有限公司 | High-viscosity hazardous waste pretreatment process |
| CN112608756B (en) * | 2020-12-15 | 2022-07-15 | 深圳市环保科技集团股份有限公司 | Anaerobic dry distillation treatment method for waste paint slag |
| CN115261096A (en) * | 2022-08-11 | 2022-11-01 | 浙江红狮环保股份有限公司 | Method for preparing alternative fuel by utilizing various solid wastes such as industrial leftover materials, domestic sludge, stale garbage and the like |
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| US6248140B1 (en) * | 1992-08-04 | 2001-06-19 | Scaltech Inc. | Fuel composition recycled from waste streams |
| CN1887762A (en) * | 2006-07-14 | 2007-01-03 | 北京金隅红树林环保技术有限责任公司 | Solid waste treating process |
| CN101173196B (en) * | 2007-11-13 | 2011-08-03 | 北京金隅红树林环保技术有限责任公司 | Method for substituting cement kiln fuel with garbage derived overtails |
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