CN102051246A - Method for improving quality of brown coal - Google Patents
Method for improving quality of brown coal Download PDFInfo
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- CN102051246A CN102051246A CN2010106043799A CN201010604379A CN102051246A CN 102051246 A CN102051246 A CN 102051246A CN 2010106043799 A CN2010106043799 A CN 2010106043799A CN 201010604379 A CN201010604379 A CN 201010604379A CN 102051246 A CN102051246 A CN 102051246A
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Abstract
The invention relates to a method for improving quality of brown coal. The method comprises the following steps of: a, washing a brown coal particle raw material with hot water at the temperature of more than 30 DEG C and leaching to remove dust, a part of ash and a part of sulphur which are contained in the brown coal particle raw material and obtain brown coal particles of which the quality is improved preliminarily; b, feeding brown coal particles of which the quality is improved preliminarily into a boiling vessel, boiling the brown coal particles by steam under a pressurization condition for a certain time to obtain the brown coal particles of which the quality is improved further, and discharging liquid water obtained in the boiling process; and c, releasing pressure of the boiling vessel and discharging the brown coal particles of which the quality is improved further.
Description
Invention field
The present invention relates to the working method of brown coal, more specifically, relate to a kind of method of brown coal being carried out upgrading.
Background technology
Brown coal are the lower coals of degree of coalification, and its water content is very high, and weathering easily contains a certain amount of original humic acid in air, and volatile content is generally between 45-55%.Because brown coal moisture content height, calorific value is low, the easy-weathering spontaneous combustion, and the transportation cost height of unit energy is unfavorable for long distance conveying and storage.The direct combustion thermal efficiency of brown coal is also very low.Brown coal all need the moisture content in the coal is reduced to below 10% in liquefaction, destructive distillation and gasification as raw material.So brown coal upgrading processing is called the key of the efficient development and use of brown coal.So-called brown coal upgrading is meant brown coal in processes such as dehydration, moulding and thermolysis, and the The Nomenclature Composition and Structure of Complexes of coal changes, and changes into the upgraded coal with approximate bituminous coal character.Existing various brown coal upgrading technology has had than more comprehensively describing in " the brown coal upgrading state of the art and China's brown coal upgrading technology trends pre-test " (Shenhua science and technology second phase author: Shao person of outstanding talent-2009 year April) literary composition.
With maximally related D-K non-evaporating dehydrolysis technology and the K-fuel technology of mainly containing of the present invention.Japan power supply development company (D) and Kawasaki Heavy Industries company (K) began one's study from 1976 and have successfully developed D-K non-evaporating dehydrolysis technology.The D-K dewatering process can realize that brown coal moisture heats under non-evaporation conditions, moisture is deviate from from brown coal with liquid state, and its ature of coal changes similar natural incoalation.
The K-fuel technology, it is U.S. KFx company patent of invention " method and apparatus of thermally upgrading carbonaceous materials " (Chinese patent publication number: CN 1989227A), in this technical scheme, carbon raw material is carried out hot upgrading in the steam under pressure environment, to remove moisture and other byproduct.Can adopt multiple water/solid separating device in the process vessel, with as often as possible from being removed moisture the charging of upgrading.Heating medium inlet nozzle and the design of Processing Room ventage strategy are on the process vessel wall, to reduce the short circuit of heating medium as far as possible to the container venting port, and from charging and condensing vapour, remove hot water continuously, make the upgrading raw material of from process vessel, removing when discharging, not carry free water content.After the upgrading, can carry out charging rehydrated, to improve the stability in transportation and the storage process.
But above-mentioned technology all exists shortcoming.D-K non-evaporating dehydrolysis technology and K-fuel technology are not washed and are leached raw material before upgrading, and the finished product fine powder is many, transport in the especially loading and unloading operation at finished product, and easier generation dust not only influences operating environment, and causes product loss.Though the K-fuel technology has increased rehydrated operation after upgrading, do not change the many facts of fine powder in the finished product, can not fundamentally change dust to the influence of transporting and loading and unloading operation causes.And rehydrated process improved the moisture in the finished product, reduced the upgrading effect.
The K-fuel technology does not also utilize the flash steam and the hot water that produce in the boiling that raw material is carried out abundant preheating, therefore, gives birth to steam (heat energy) and consumes high the 2-3 of the art of this patent (approximately be doubly).Though D-K non-evaporating dehydrolysis technology is utilized flash steam and hot water, only limits between the pulp digester.Because pulp digester is a high-tension apparatus, the cost height is restricted the hot water energy recovery.
In addition, K-fuel technology pulp digester is provided with upper and lower two lock hoppers, and continuously cooking is interrupted to advance (row) material, and the material that contains brown coal passes through locking-valve under differential pressure, and the solid matter in the material is big to the valve wearing and tearing; Following lock hopper is difficult to accomplish free-water is drained earlier before discharge, and upgrading efficient is had a negative impact.
Old friends wish further to develop brown coal upgrading technology to overcome above-mentioned shortcoming.
Summary of the invention
First aspect the invention provides a kind of method that brown coal are carried out upgrading, may further comprise the steps:
A. greater than 30 ℃ hot water the brown coal particulate material is washed and leach processing with temperature,, obtain brown coal particle simultaneously through preliminary upgrading to remove dust contained in the described brown coal particulate material and a part of ash and a part of sulphur; Then,
B. make the brown coal particle of the preliminary upgrading of described warp enter pulp digester, then under pressurized conditions with this brown coal particle certain hour of steam boiling, obtaining brown coal particle, and discharge resulting liquid water in digestion process through further upgrading; Then,
C. make described pulp digester release, therefrom discharge the brown coal particle of the further upgrading of described warp then.
Second aspect the invention provides and a kind of brown coal are carried out upgrading and improve the method for process thermo-efficiency, may further comprise the steps:
A. greater than 30 ℃ hot water the brown coal particulate material is washed and leach processing with temperature,, obtain brown coal particle simultaneously through preliminary upgrading to remove dust contained in the described brown coal particulate material and a part of ash and a part of sulphur; Then,
B. in a plurality of pulp digesters, under pressurized conditions, the brown coal particle of the preliminary upgrading of described warp is carried out boiling with steam, described a plurality of pulp digester flows to being connected in parallel with regard to described brown coal particulate, and each pulp digester all comprises primary steam inlet and secondary steam enters the mouth, wherein the operating process of each pulp digester be divided into following substep: i in chronological order, the brown coal particle of the preliminary upgrading of described warp of packing into; Ii, feed the steam of the other pulp digester that finishes from firm boiling, carry out pre-boiling, make this other pulp digester release simultaneously with brown coal particle to the preliminary upgrading of described warp via secondary steam inlet; Iii, the primary steam that feeds from vapour generator from the primary steam inlet continue described brown coal particle is carried out boiling, and certain hour is carried out in boiling, obtains the brown coal particle through further upgrading, and discharges resulting liquid water in digestion process; Iv, by with the discharge of steam in this pulp digester in some other or certain several pulp digester that to be ready carrying out substep ii so that this pulp digester is carried out release; Then;
C. discharge the brown coal particle of the further upgrading of described warp the pulp digester after release finishes.
The accompanying drawing summary
Fig. 1 is the schematic process flow diagram of the embodiment of a first aspect of the present invention.
Fig. 2 is the schematic process flow diagram of the preferred embodiment of a first aspect of the present invention.
Fig. 3 is the schematic process flow diagram of a plurality of pulp digesters of a second aspect of the present invention.
The experiment that Fig. 4 is in the embodiments of the invention to be adopted is with the synoptic diagram of pulp digester.
Accompanying drawing only is schematically, does not plan to limit by any way the present invention.
Detailed Description Of The Invention
In the step a of a first aspect of the present invention, greater than 30 ℃ hot water brown coal particle raw material is washed and leaches processing with temperature, to remove dust contained in the described brown coal particle raw material and a part of ash and a part of sulphur, obtain simultaneously the brown coal particle through preliminary upgrading. Wherein said washing and leaching are carried out in washer, and described dust is removed by the washing effect of water, and described a part of ash and a part of sulphur are removed by the leaching effect of water. The granularity of wherein said brown coal particle raw material is 3-100mm, preferred 5-50mm, and water content is 〉=20%. This raw material can obtain with screening by the brown coal raw coal being carried out fragmentation. Wherein said hot water can be the hot water in any source, as long as its temperature is greater than 30 ℃. In the simplest embodiment at the step a of a first aspect of the present invention, described hot water is the hot water that is produced by independent water heater. In the preferred embodiment of the step a of first aspect, in order to realize the maximization of the thermal efficiency, described hot water is that the steam of using the stress-relief process from hereinafter described boiling vessel to discharge carries out the condensed water that produces after the pre-boiling to described brown coal particle, or the steam that produces with described vacuum flashing carries out the condensed water that produces after the pre-boiling or resulting liquid water in the described boiling process to described brown coal particle. Certainly, also can use the combination of above various hot water. With described hot water described brown coal particle raw material is washed and leaches, can remove dust contained in the brown coal particle raw material and a part of ash and a part of sulphur. For example, in one embodiment, the most tiny dust in the brown coal particle raw material, about 30% ash and a part of sulfur scrubber can be removed. This washing can also be played with hot water brown coal particle raw material is carried out pre-warmed effect. Obtain the brown coal particle through preliminary upgrading after the washing. This washing process carries out in washer, and it also can be a plurality of that washer can be one. In the simplest embodiment of the present invention, only adopt a washer to carry out described washing process, then this moment, this process was batch process, its detailed process is as follows: in the washer of earlier first brown coal particle raw material being packed into, pass into hot water then in washer, behind the washing certain hour, discharge earlier hot water, and then discharge brown coal particle through preliminary upgrading, and then the second batch brown coal particle raw material of packing into carries out the operation of next batch, so goes round and begins again. In the preferred embodiment of the step a of first aspect, adopt a plurality of washers to carry out described washing process, each washer operates basically independently of one another, but control the residing operational phase of each washer so that each constantly always has at least one washer in the charging of carrying out brown coal particle raw material, at least one washer is also always arranged at the brown coal particle that discharges through preliminary upgrading, remaining washer then washs. So can be implemented in the on the whole washing operation of basic continous. Described washer can or add at normal pressure to depress and carries out.
In the step b of a first aspect of the present invention, make the brown coal particle of the preliminary upgrading of described warp enter boiling vessel, then under pressurized conditions with this brown coal particle certain hour of vapour cooking, obtaining the brown coal particle through further upgrading, and discharge resulting liquid water in the boiling process. Described boiling vessel is pressure resistant vessel, and it comprises tank body, coal charging aperture, Hot Water Feeding mouth, steam charging aperture, coal discharging opening, water discharging opening, steam discharging opening at least. The brown coal particle of the preliminary upgrading of described warp enters the tank body from the coal charging aperture, introduces steam by the steam charging aperture then, and this steam has certain pressure. Described steam is the steam in any source, preferred saturated vapor, more preferably superheated steam. In preferred embodiments, described steaming is the primary steam from steam generator, is called again living steam, and it also can be saturated vapor or superheated steam. Under pressurized conditions with described vapour cooking brown coal particle certain hour. Described pressurized conditions refers to that the absolute pressure of steam is 1-9MPa, and described certain hour is 5-120 minute. Brown coal particle through preliminary upgrading is dehydrated under the effect of steam under pressure, obtains the brown coal particle through further upgrading. The liquid water that removes then collects in the boiling vessel bottom, and discharges from the water discharging opening continuously or off and in the boiling process, optionally is used as the hot water among the step a of the present invention after this liquid water is discharged. In the boiling process, optionally discharge a part of on-condensible gas from the steam discharging opening of boiling vessel, to keep described pressurized conditions. Described on-condensible gas mainly is the air that enters with the ribbing and some fugitive constituents in the coal, and a part of steam also can be discharged boiling vessel with on-condensible gas. Carry out the step c of the following stated after boiling is complete.
In the step c of a first aspect of the present invention, make described boiling vessel release, therefrom discharge then the brown coal particle of the further upgrading of described warp. Wherein said release is undertaken by discharge steam outside boiling vessel, perhaps described release is carried out vacuum flashing by the material after complete to boiling and is carried out, this vacuum flashing is by vacuumizing to carry out from the steam discharging opening or from the water discharging opening, by vacuumizing the boiling vessel internal pressure is reduced, so that the water that a part still is present in the brown coal particle of further upgrading under reduced pressure is evaporated again, play the effect of further from brown coal, dewatering. Outwards discharge steam by described steam discharging opening, to carry out release. This stress-relief process continues to carry out always until the pressure in the described boiling vessel is normal pressure. Discharge then the brown coal particle of the further upgrading of described warp from the coal discharging opening of boiling vessel. Because this moment, the pressure in the boiling vessel be normal pressure, so solid matter is minimized the wearing and tearing of discharge valve in the process of discharge brown coal particle.
More than be the detailed description of each step of a first aspect of the present invention, schematically illustrated the flow process relation between each step among Fig. 1.
In the preferred embodiment of a first aspect of the present invention, between step a and step b, also comprise the step that steam that the stress-relief process with described boiling vessel produces carries out pre-boiling to described brown coal particle, perhaps between step a and step b, also comprise the step that the steam that produces with described vacuum flashing carries out pre-boiling to described brown coal particle, as shown in Figure 2. The effect of pre-boiling is the preheating before the coal to the preliminary upgrading of described warp carries out formal boiling, and this can shorten the needed time of formal boiling, can also realize the taking full advantage of of heat energy in the steam that steam that stress-relief process produces and vacuum flashing produce. In the preferred embodiment of a first aspect of the present invention, can comprise that also the brown coal particle to the further upgrading of described warp carries out step dry and cooling. These dryings and cooling step are well known to a person skilled in the art, for example drying can dry to carry out by hot blast, and cooling can be undertaken by pass into cold wind in the brown coal of drying, and concrete details dry and cooling step does not repeat them here.
More than be the detailed introduction of a first aspect of the present invention, but the present invention can also otherwise implement, see the technical scheme of a second aspect of the present invention.
In the step a of a second aspect of the present invention, greater than 30 ℃ hot water brown coal particle raw material is washed and leaches processing with temperature, to remove dust contained in the described brown coal particle raw material and a part of ash and a part of sulphur, obtain simultaneously the brown coal particle through preliminary upgrading. The granularity of wherein said brown coal particle raw material is 3-100mm, preferred 5-50mm, and water content is 〉=20%. This raw material can obtain with screening by the brown coal raw coal being carried out fragmentation. Wherein said hot water can be the hot water in any source, as long as its temperature is greater than 30 ℃. In the simplest embodiment of the step a of a second aspect of the present invention, described hot water is the hot water that is produced by independent water heater. In the preferred embodiment of the step a of second aspect, in order to realize the maximization of the thermal efficiency, described hot water is to use steam from the stress-relief process of hereinafter described boiling vessel described brown coal particle to be carried out the condensed water that produces after the pre-boiling, or the steam that produces with described vacuum flashing carries out the condensed water that produces after the pre-boiling or the liquid water of discharging to described brown coal particle from described boiling vessel in described boiling process. Certainly, also can use the combination of above various hot water. With described hot water described brown coal particle raw material is washed, can remove dust contained in the brown coal particle raw material and a part of ash and a part of sulphur. For example, in one embodiment, the most tiny dust in the brown coal particle raw material, about 30% ash and a part of sulfur scrubber can be removed. This washing can also be played with hot water brown coal particle raw material is carried out pre-warmed effect. Obtain the brown coal particle through preliminary upgrading after the washing. This washing process carries out in washer, and it also can be a plurality of that washer can be one. In the simplest embodiment of the step a of second aspect, only adopt a washer to carry out described washing process, then this moment, this step a was batch process, its detailed process is as follows: in the washer of earlier first brown coal particle raw material being packed into, pass into hot water then in washer, behind the washing certain hour, discharge earlier hot water, and then discharge brown coal particle through preliminary upgrading, and then the second batch brown coal particle raw material of packing into carries out the operation of next batch, so goes round and begins again. In the preferred embodiment of the step a of second aspect, described step a carries out in a plurality of washers, described a plurality of washer is connected in parallel for being with regard to the flow direction of brown coal particle and the flow direction of described hot water, and the brown coal particle of the preliminary upgrading of warp that obtains after the washing enters and carries out boiling among the step b of second aspect and process. Perhaps, in another preferred embodiment of the step a of second aspect, described a plurality of washer with regard to the flow direction of brown coal particle for being connected in parallel, and each washer all comprises first hot water inlet and second hot water inlet at least, wherein the operating process of each washer be divided in chronological order following substep: i, the described brown coal particle raw material of packing into; Ii, pass into the hot water of from the complete other washer of firm washing, discharging via first hot water inlet, described brown coal particle raw material is carried out the washing first time; Iii, pass into the hot water that is produced by independent water heater, perhaps pass into the steam of using from the stress-relief process of described boiling vessel and described brown coal particle through preliminary upgrading is carried out the condensed water that produces after the pre-boiling, perhaps pass into the steam that produces with described vacuum flashing and described brown coal particle through preliminary upgrading is carried out the condensed water that produces after the pre-boiling, to carry out the washing second time, until wash completely, obtain the brown coal particle of the preliminary upgrading of described warp; Iv, with the hot water emission in this washer to some other or certain severally to be ready carrying out in the washer of substep ii, the brown coal particle of the preliminary upgrading of described warp is then discharged washer to wait that being sent to described step b carries out boiling. More than each washer basically operate independently of one another, but control the residing operational phase of each washer so that each constantly always has at least one washer in the charging of carrying out brown coal particle raw material, at least one washer is also always arranged at the brown coal particle that discharges through preliminary upgrading, remaining washer then washs. So can be implemented in the on the whole washing operation of basic continous. Described washer is at normal pressure or add to depress and carry out. In a preferred embodiment, described first hot water inlet and second hot water inlet can be same hot water inlets, and it passes into the hot water of separate sources in the different time periods.
In the step b of a second aspect of the present invention, in a plurality of boiling vessels, under pressurized conditions, with steam the brown coal particle of the preliminary upgrading of described warp is carried out boiling, described a plurality of boiling vessel with regard to the flow direction of described brown coal particle for being connected in parallel, and the structure of each boiling vessel and aforementioned structure are basic identical, and just the steam inlet changes into and comprises primary steam entrance and indirect steam entrance. Each boiling vessel operates basically independently, wherein the operating process of each boiling vessel be divided in chronological order following substep: i, the brown coal particle of the preliminary upgrading of described warp of packing into; Ii, pass into steam from the complete other boiling vessel of firm boiling via the indirect steam entrance, carry out pre-boiling with the brown coal particle to the preliminary upgrading of described warp, make simultaneously this other boiling vessel release; Iii, the primary steam that passes into from steam generator from the primary steam entrance continue described brown coal particle is carried out boiling, and certain hour is carried out in boiling, obtains the brown coal particle through further upgrading, and discharges resulting liquid water in the boiling process; Iv, by the steam in this boiling vessel being discharged in some other or certain several boiling vessel that to be ready carrying out substep ii so that this boiling vessel is carried out release. Wherein said pressurized conditions refers to that the absolute pressure of steam is 1-9MPa, and described certain hour is 5-120 minute. The pressure that described release proceeds in the boiling vessel is normal pressure. Number and the residing substep of each boiling vessel to a plurality of boiling vessels are regulated, to realize that each constantly always has at least one boiling vessel carrying out step I, also always have at least one boiling vessel carrying out step I v, remaining boiling vessel is then carrying out step I i or iii. And the steam pipework between each boiling vessel and valve arranged and regulate, so that the steam that certain boiling vessel stress-relief process is discharged can enter another or several boiling vessel that to be ready carrying out substep ii. Such pipeline and the layout of valve and adjusting are well known to a person skilled in the art, do not repeat them here. So can be implemented in the on the whole boiling operation of basic continous. In a preferred embodiment, described primary steam entrance and indirect steam entrance can be same steam inlets, and it passes into the steam of separate sources in the different time periods. After the step b, carry out then the step c of a second aspect of the present invention. Fig. 3 schematically show that a plurality of boiling vessels are connected in parallel and each boiling vessel between pipeline and the exemplary figure of valve arrangement, wherein these pipelines and valve arrangement mode are arranged as requirement can realize purpose of the present invention, those skilled in the art can realize this layout, and arrangement is not limited to the concrete mode shown in the figure.
The step c of a second aspect of the present invention is identical with the step c of a first aspect of the present invention.
In the preferred embodiment of a second aspect of the present invention, between step a and step b, also comprise the step that the steam that stress-relief process produced with described pulp digester carries out pre-boiling to described brown coal particle, perhaps between step a and step b, also comprise the step that the steam that produces with described vacuum flashing carries out pre-boiling to described brown coal particle.The effect of pre-boiling is the preheating before the coal to the preliminary upgrading of described warp carries out formal boiling, and this can shorten the needed time of formal boiling, can also realize the making full use of of heat energy in the steam of stress-relief process and the steam that vacuum flashing is produced.In the preferred embodiment of a second aspect of the present invention, can comprise that also the brown coal particle to the further upgrading of described warp carries out drying and refrigerative step.These dryings and cooling step are well known to a person skilled in the art, for example drying can be undertaken by hot-air seasoning, and cooling can be undertaken by feed cold wind in the brown coal of drying, and concrete details dry and cooling step does not repeat them here.
Embodiment
In conjunction with the accompanying drawings, specify embodiment of the present invention by following examples, these embodiment only provide for illustrational purpose, for example, for narrate clear and complete for the purpose of, mentioned a lot of concrete processing steps and equipment among the embodiment, these processing steps and equipment are not all to be that enforcement method of the present invention is necessary.Embodiment does not plan to limit the scope of the invention by any way yet, and true scope of the present invention is only determined by claim.
On laboratory scale, carried out each embodiment.Wherein the present invention tests the pulp digester structure as shown in Figure 4: top is flange and covering plate structure, is furnished with pressure, thermometric instrument and blow-off valve on the cover plate, and outlet valve is arranged at the bottom, and there is admission valve the side.About 4 liters of cubic capacity, experiment is packed good with wire netting earlier with the sample coal cinder, puts into pulp digester from the upper flange mouth again; Cooking pressure is regulated by lateral admission valve; Boiling temperature keeps the interior steam of pulp digester to be in state of saturation by the outlet valve of bottom and the vent valve control on top.Each laboratory sample coal cinder weight in wet base 1000g, sample coal cinder particle diameter 6-20mm.
Washing step then is to heat on furnace for testing room with the liquid water that boiling produces, and the sample coal is washed, and wash temperature 80-90 ℃, the pressure in the washer is normal pressure.
Oven dry is carried out in baking oven in the experiment, and oven temperature is controlled at 100-105 ℃.
Wherein the testing method of each experimental index is as follows: total moisture determination foundation: GB/T211-2007 in the coal; The test foundation of the analysis moisture of coal, ash content, fugitive constituent, the technical analysis method GB/T212-2008 of coal; The heating-value determination foundation of coal: GB/T213-2008; Give money as a gift basic moisture content, the basic ash of giving money as a gift, the basic fugitive constituent of giving money as a gift is meant and calculates based on the weight of removing the butt coal behind the moisture content.
Comparative Examples
Sample is brown coal, through screening, gets the 6-20mm particle, does not make carrying out washing treatment, directly carries out boiling.The cooking pressure of three brown coal samples is respectively 1.0MPa, 2.5MPa, 4.0MPa, and cooking time is 30 minutes, and the cooking pressure of two brown coal samples is 4.0MPa, and cooking time was respectively 15 minutes, 45 minutes, totally 5 experiments.Concrete experiment condition and experimental result see Table 1.
Embodiment
Sample is brown coal, through screening, gets the 6-20mm particle, washs earlier, carries out boiling then.Wherein concrete washing time and conditions of cooking and experimental result see Table 2.
Data in contrast table 1 and the table 2 are not difficult to find that for the brown coal that firm boiling finishes, at the basic thermal value of giving money as a gift, the aspects such as the basic ash and the basic fugitive constituent of giving money as a gift of giving money as a gift, embodiment all is better than Comparative Examples.For the process dried finished products, at the basic thermal value of giving money as a gift, the aspects such as the basic ash and the basic fugitive constituent of giving money as a gift of giving money as a gift, embodiment also obviously is better than Comparative Examples.Find also that through range estimation the dust that the finished product that obtains among the embodiment is produced will be less than the sample that obtains in the Comparative Examples far away in transportation in the experiment.Experimental procedure to embodiment and Comparative Examples compares and can find, these advantages obviously are to carry out washing step earlier to bring before boiling.The present invention earlier washed this step to it before brown coal are carried out boiling be that conventional thinking with those skilled in the art runs in the opposite direction.Because just contained a large amount of water in the natural brown coal originally, in routine is that the brown coal modification technology of purpose is for example in D-K non-evaporating dehydrolysis and the K-fuel technology with the dehydration, those skilled in the art wish that naturally the water-content in the processed brown coal is few more good more, at least do not wish on the water-content basis of natural brown coal, to remove to increase water-content again, so can not expect earlier brown coal being carried out carrying out washing treatment, because this obviously can introduce big water gaging again in this brown coal raw material not low with regard to water-content.The present invention then acts in a diametrically opposite way, and has introduced washing step before boiling, and has obtained many beat all useful technique effects.Another advantage of the present invention is, discharges solid materials because pulp digester unloads earlier again after being depressed into normal pressure, so solid materials compares the D-K non-evaporating dehydrolysis of discharging under high pressure to the wearing and tearing of discharge gate and wearing and tearing that the K-fuel technology is produced are much smaller.The present invention be advantageous in that in industrialized unit, can be as the heat energy of steam and hot water being utilized step by step as described in a second aspect of the present invention and improve the thermo-efficiency of overall process.
Claims (20)
1. method that brown coal are carried out upgrading may further comprise the steps:
A. greater than 30 ℃ hot water the brown coal particulate material is washed and leach processing with temperature,, obtain brown coal particle simultaneously through preliminary upgrading to remove dust contained in the described brown coal particulate material and a part of ash and a part of sulphur; Then,
B. make the brown coal particle of the preliminary upgrading of described warp enter pulp digester, then under pressurized conditions with this brown coal particle certain hour of steam boiling, obtaining brown coal particle, and discharge resulting liquid water in digestion process through further upgrading; Then,
C. make described pulp digester release, therefrom discharge the brown coal particle of the further upgrading of described warp then.
2. the process of claim 1 wherein that described steam is the primary steam from vapour generator, this primary steam is saturation steam or superheated vapour.
3. the process of claim 1 wherein that described release undertaken by discharge steam outside pulp digester.
4. the process of claim 1 wherein that described release carries out vacuum flashing by the material after boiling is finished and carry out.
5. the process of claim 1 wherein that carrying out the pressure of described release in described pulp digester is normal pressure.
6. the method for claim 3 wherein also comprises the step of using the steam that stress-relief process discharged from described pulp digester that described brown coal particle is carried out pre-boiling between step a and step b.
7. the method for claim 4 wherein also comprises the step that the steam that produces with described vacuum flashing carries out pre-boiling to described brown coal particle between step a and step b.
8. the process of claim 1 wherein that the granularity of the brown coal particulate material among the step a is 3-100mm, water content is 〉=20%.
9. the method for claim 1, wherein said hot water is by the independent hot water that water-heater produced, or use the steam that stress-relief process discharged from described pulp digester described brown coal particle to be carried out the water of condensation that is produced after the pre-boiling, or described brown coal particle is carried out the water of condensation that produced after the pre-boiling or resulting liquid water or their combination in the described digestion process with steam that described vacuum flashing produced.
10. the process of claim 1 wherein that described pressurized conditions is meant that the absolute pressure of steam is 1-9MPa, described certain hour is 5-120 minute.
11. each method in the aforementioned claim comprises that also the brown coal particle to the further upgrading of described warp carries out drying and refrigerative step.
12. the method for brown coal being carried out upgrading and improving process thermo-efficiency may further comprise the steps:
A. greater than 30 ℃ hot water the brown coal particulate material is washed and leach processing with temperature,, obtain brown coal particle simultaneously through preliminary upgrading to remove dust contained in the described brown coal particulate material and a part of ash and a part of sulphur; Then,
B. in a plurality of pulp digesters, under pressurized conditions, the brown coal particle of the preliminary upgrading of described warp is carried out boiling with steam, described a plurality of pulp digester flows to being connected in parallel with regard to described brown coal particulate, and each pulp digester all comprises primary steam inlet and secondary steam enters the mouth, wherein the operating process of each pulp digester be divided into following substep: i in chronological order, the brown coal particle of the preliminary upgrading of described warp of packing into; Ii, feed the steam of the other pulp digester that finishes from firm boiling, carry out pre-boiling, make this other pulp digester release simultaneously with brown coal particle to the preliminary upgrading of described warp via secondary steam inlet; Iii, the primary steam that feeds from vapour generator from the primary steam inlet continue described brown coal particle is carried out boiling, and certain hour is carried out in boiling, obtains the brown coal particle through further upgrading, and discharges resulting liquid water in digestion process; Iv, by with the discharge of steam in this pulp digester in some other or certain several pulp digester that to be ready carrying out substep ii so that this pulp digester is carried out release; Then;
C. discharge the brown coal particle of the further upgrading of described warp the pulp digester after release finishes.
13. the method for claim 12, wherein carrying out the pressure of release in pulp digester is normal pressure.
14. the method for claim 12, wherein said hot water is by the independent hot water that water-heater produced, or use the steam that is discharged from the stress-relief process of described pulp digester described brown coal particle through preliminary upgrading to be carried out the water of condensation that is produced after the pre-boiling, or described brown coal particle through preliminary upgrading is carried out the water of condensation that produced after the pre-boiling or resulting liquid water or their combination in the described digestion process with steam that described vacuum flashing produced.
15. the method for claim 12, wherein said step a carries out in a plurality of washers, and described a plurality of washers flow to regard to the brown coal particulate and the flow direction of described hot water is connected in parallel for being.
16. the method for claim 12, wherein said step a carries out in a plurality of washers, described a plurality of washer flows to being connected in parallel with regard to the brown coal particulate, and each washer all comprises first hot water inlet and second hot water inlet at least, wherein the operating process of each washer be divided into following substep: i in chronological order, the described brown coal particulate material of packing into; Ii, feed the hot water from the other washer that firm washing finishes, discharge, wash described brown coal particulate material is carried out first time via first hot water inlet; Iii, feeding are by the independent hot water that water-heater produced, perhaps feed the steam use from the stress-relief process of described pulp digester and described brown coal particle through preliminary upgrading is carried out the water of condensation that produced after the pre-boiling, perhaps feed with the steam that described vacuum flashing produced and described brown coal particle through preliminary upgrading is carried out the water of condensation that produced after the pre-boiling, perhaps feed the described liquid water of from described digestion process, discharging, to carry out the washing second time, finish until washing, obtain the brown coal particle of the preliminary upgrading of described warp; Iv, with the hot water emission in this washer to some other or certain severally to be ready carrying out in the washer of substep ii, the brown coal particle of the preliminary upgrading of described warp is then discharged washer to wait that being sent to described step b carries out boiling.
17. the method for claim 12, wherein said pressurized conditions are meant that the absolute pressure of steam is 1-9MPa, described certain hour is 5-120 minute.
18. each method among the claim 12-17 comprises that also the brown coal particle to the further upgrading of described warp carries out drying and refrigerative step.
19. the method for claim 12, wherein said primary steam inlet and secondary steam inlet are same steam-in.
20. the method for claim 12, wherein said first hot water inlet and described second hot water inlet are same hot water inlet.
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