CN105779059B - A kind of fine coal high intensity forming method of binder free - Google Patents
A kind of fine coal high intensity forming method of binder free Download PDFInfo
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- CN105779059B CN105779059B CN201610201142.3A CN201610201142A CN105779059B CN 105779059 B CN105779059 B CN 105779059B CN 201610201142 A CN201610201142 A CN 201610201142A CN 105779059 B CN105779059 B CN 105779059B
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L5/00—Solid fuels
- C10L5/02—Solid fuels such as briquettes consisting mainly of carbonaceous materials of mineral or non-mineral origin
- C10L5/06—Methods of shaping, e.g. pelletizing or briquetting
- C10L5/08—Methods of shaping, e.g. pelletizing or briquetting without the aid of extraneous binders
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L2290/00—Fuel preparation or upgrading, processes or apparatus therefore, comprising specific process steps or apparatus units
- C10L2290/28—Cutting, disintegrating, shredding or grinding
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L2290/00—Fuel preparation or upgrading, processes or apparatus therefore, comprising specific process steps or apparatus units
- C10L2290/30—Pressing, compressing or compacting
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L2290/00—Fuel preparation or upgrading, processes or apparatus therefore, comprising specific process steps or apparatus units
- C10L2290/32—Molding or moulds
Abstract
The invention discloses a kind of fine coal high intensity forming method, the forming method includes：A, the average grain diameter of the step of crushing feed coal to obtain coal dust, the coal dust is not less than 20 μm, wherein coal dust content of the grain size no more than 80 μm is not less than 90wt%；The coal dust content that grain size is 40 μm~80 μm is not less than 10wt%；B, the coal dust for obtaining step a is sent into the feed hopper of compound stalk forming equipment, and the step of being de-gassed to the material in the feed hopper；C, make the regulating step that the temperature of material in the feed hopper is 50 DEG C~100 DEG C, moisture is 2wt%~8wt%；Former is sent into d, by the material in the feed hopper to be molded, the step of to obtain moulded coal.The forming method of the present invention is wide to coal adaptability and it is not necessary that feed coal to be crushed to too small grain size, even if to be molded the maximum no adhesion coal of difficulty as feed coal, equally intensity can be made in the case where that need not use any adhesive>89% briquette prod.
Description
Technical field
The invention belongs to fine coal machine-shaping field, more particularly to the fine coal high intensity forming method of a kind of binder free.
Background technology
Since the industrial revolution, the mankind use fossil energy on a large scale, are produced not to our ecological environment
Reversible huge harmful effect.Especially into the new century, greenhouse effects are increasingly severe, and extreme weather emerges one after another, and environment is dirty
The lasting aggravation of dye.In this background, countries in the world generally adjust energy policy, are dedicated to the energy profit of development environment friendly
Use approach.
The energy problem of China is more acute, although energy total amount is abundant, occupancy volume per person is relatively low.China Petroleum is per capita
Stock number is only about the 11% of world average level, and natural gas only has 5% or so, and coal resources per capita ownership also just corresponds to
50% or so of world average level.The energy resource structure of China is the few gas of the few oil of more coals, according to statistics, by the end of the year 2007, China
Conventional primary energy is verified in remaining mining resources amount (including coal, oil, natural gas and water energy), and coal accounts for 73.2%, stone
Oil accounts for 1.3%, and natural gas accounts for 1.3%, and water can account for 24.2%.Up to 25.36 hundred million t, total quantity consumed reaches Chinese coal yield in 2007
25.8 hundred million t are respectively 76.4% and 69.5% in the proportion of primary energy, and yield and the consumption of coal account for absolutely main force.China
Energy-consuming present situation determine focusing on to the cleaning of coal, efficient using for Chinese current energy policy adjustment.
As one kind of Filter Tuber For Clean Coal production technology, moulded coal production is with easy to operate, technology maturation, of low cost, energy efficiency is apparent,
The advantages that discharge amount of exhaust gas is reduced is worth us to greatly develop.
In addition, in Activated Carbon Production, it has been widely used in the method that coal prepares active carbon from coal as raw material, in order to make
Obtained activated carbon has higher-strength when in use, it usually needs forming processes are carried out before coal carries out carbonization-activation, therefore,
The molding of coal high intensity is also to prepare the basis of high intensity activated carbon.
Although pulverized coal forming technology has been widely used in the field of deep of raw coal, and most of pulverized coal forming technologies are still
It needs to add the various binders such as coal tar pitch, not only increases cost, but also manufactured moulded coal carries out drying or heated baking,
Reduce production efficiency；Additionally due to the binders such as common coal tar pitch, coal tar can melt and volatilize after the heating so that final
The intensity of product is not also high, and in Activated Carbon Production, and the residue of coal tar pitch etc. can also block the hole of activated carbon, unfavorable
In the quality of raising activated carbon, therefore also limit application of the no adhesion coal in active carbon from coal preparation.
Currently, the pulverized coal forming research of binder free also increasingly becomes the hot spot of people's research.CN101402454A is public
A kind of preparation method of pressed active carbon is opened, wherein coal dust is pressed before carrying out carbonization-activation processing, however is
Not outer adding additives, must not be added without a large amount of weak caking coal and the stronger rich coal of caking property in coal dust raw material, and by
In the addition of a large amount of binding coals, need slowly to heat to prevent particle from foaming in carbonization process in carbonization process, and
And the soak time grown is needed very much so that obtained activated carbon has sufficiently large surface area.
CN101722669A discloses a kind of fine coal (namely coal dust) binder free forming method and pair of applicable this method
Roller molding machine, in that patent, grain size is not more than 6mm and water content is sent directly into special pair in the coal dust of 2~15wt%
Roller molding machine is molded.On the one hand, which needs to use special roller briquetting machine, on the other hand, when with without viscous
When knot property coal is main, the intensity after pulverized coal forming is also difficult to satisfactory.
CN1033262A discloses a kind of method preparing activated carbon, including no adhesion coal dust is broken to 10 μm or less so
After be pressed.The patent points out that the grain size after raw coal crushes is smaller, is more conducive to increase Unit Weight between particle
The number of contact point, to increase the bonding force in particle between submicron.However, coal dust powder particle diameter is smaller, reuniting may
Property it is bigger, it is contemplated that follow-up compression moulding needs moisture, therefore moisture control difficulty is big, and it is also big to crush difficulty, to equipment
It is required that high, it is difficult to utilization and extention.Meanwhile the study found that coal particle size is too thin, it is easy to cause its internal void mistake after compound stalk forming
Carefully, the effusion of follow-up charing fugitive constituent and the diffusion of activation gas internally hole are influenced when preparing activated carbon.
For this reason, it is necessary to propose a kind of new binder free coal powder formation method.
Invention content
The purpose of the present invention is to provide a kind of fine coal high intensity forming methods, are bonded with solving not using in the prior art
Problem stringent, that adaptability is poor is required to coal dust when agent is molded.
To achieve the above object, the present invention uses following technical scheme：
A kind of fine coal high intensity forming method, the forming method include：
A, the average grain diameter of the step of crushing feed coal to obtain coal dust, the coal dust is not less than 20 μm, wherein
Coal dust content of the grain size no more than 80 μm is not less than 90wt%；The coal dust content that grain size is 40 μm~80 μm is not less than 10wt%；
B, the coal dust for obtaining step a is sent into the feed hopper of compound stalk forming equipment, and to the material in the feed hopper
The step of being de-gassed；
C, make the adjusting that the temperature of material in the feed hopper is 50 DEG C~100 DEG C, moisture is 2wt%~8wt%
Step；With
D, the material in the feed hopper is sent into former to be molded, the step of to obtain moulded coal.
In the forming method of the present invention, the adaptability of the feed coal is extensive, can be no adhesion coal, weak caking property
One or more mixtures in coal, medium binding coal on the weak side, medium inclined heavy caking coal or heavy caking coal.The nothing
Binding coal, weak caking coal, medium binding coal on the weak side, medium inclined heavy caking coal or heavy caking coal are ripe for this field
Know, that is, classify by adhesive index, 0~5 is no adhesion coal, and 5~20 be weak caking coal, and 20~50 be medium bonding on the weak side
Property coal, 50~65 be medium inclined heavy caking coal, be more than 65 be heavy caking coal.
It will be appreciated by those skilled in the art that the caking index of feed coal is higher, is more conducive to molding and prepares the higher type of intensity
Coal, and the caking index of feed coal is lower, then the difficulty for being molded the preparation higher moulded coal of intensity is bigger.The forming method of the present invention
It is adjusted by the various aspects to feed coal so that whether the higher feed coal of caking index or caking index are lower
Feed coal can successfully prepare high intensity moulded coal, be therefore particularly suitable for no adhesion coal or based on no adhesion coal
Feed coal molding, for example, no adhesion coal contains in all no adhesion coals of the feed coal or the feed coal
Amount is more than 50wt%, for example is 60wt%, 70wt%, 80wt% or 90wt%, and rest part can be weak caking coal etc..
In the present invention, it is preferable that the feed coal is no adhesion coal；It is further preferred that the caking index of the no adhesion coal
It is≤2, for example, 0,1 or 2.
In the forming method of the present invention, step a is to crush to be distributed to obtain having specified particle size to feed coal
Coal dust.The study found that when there is the coal dust above-mentioned dynamics to be distributed, different-grain diameter coal dust may be implemented in forming process
Rational gradation composition improves shaping strength.Preferably, in the coal dust obtained by step a, coal dust content of the grain size no more than 80 μm is not less than
95wt%；Coal dust content of the grain size no more than 40 μm is not less than 70wt%；It is further preferred that the average grain diameter of the coal dust is
20 μm~40 μm, such as 30 μm；It is highly preferred that the grain size of the coal dust is not more than 200 μm, such as no more than 150 μm, or not
More than 100 μm.It will be appreciated by those skilled in the art that can be by selecting corresponding standard screen to sieve the feed coal after crushing
Point, to obtain that there is the coal dust of above-mentioned size distribution.Certainly, those skilled in the art understand that feed coal of the invention is before use
Preferably by the processing such as removing spoil and/or reduction ash content, such as content of ashes is made to be not more than 6wt%, such as 3wt%.
In the forming method of the present invention, step b is to be sent into the coal dust in the feed hopper of compound stalk forming equipment, and right
Material in the feed hopper is de-gassed, to reduce between pulverized coal particle and the air of adsorption, to be conducive to carry
High shaping strength.Skilled in the art realises that can be by being evacuated (or vacuumizing) to the feed hopper to reach de-
The purpose of gas, for example, can be arranged on the top of the feed hopper and/or side wall filter plate (ensure gas can escape and coal dust not
Can escape), vaccum-pumping equipment is connected at the filter plate back side, so that the gas adsorbed in coal dust is arranged by filter plate and vacuum system
Go out.Preferably, in step b, the pressure in the feed hopper is negative pressure, and negative pressure is that (those skilled in the art manage 0~3kPa
Solution, due to being negative pressure, wherein 0 this endpoint value can not be included), such as 0.6kPa, 1kPa or 2kPa are further preferably
The negative pressure for adjusting the feed hopper is 2.5kPa~3kPa.
In the forming method of the present invention, step c is to be adjusted to the temperature and moisture of the coal dust, so that described give
The temperature of material is 50 DEG C~100 DEG C in feed bin, moisture is 2wt%~8wt%；Preferably, make object in the feed hopper
The temperature of material is 70 DEG C~85 DEG C, moisture is 2wt%~6wt%, such as 3wt% or 4wt%.Wherein, rational moisture
Content can play the role of materials from bonding agent during subsequent compression moulding, but excessively high moisture can influence pulverized coal particle it
Between combination, and follow-up degassing process can be caused difficult；In addition, above-mentioned temperature range is conducive to the softening of pulverized coal particle, in turn
Be conducive to be molded, but the excessively high moisture that can cause in coal dust of temperature is precipitated.Therefore, above-mentioned degassing process and temperature and moisture
Adjusting this three between it is closely bound up, be divided into the other molding to coal dust and have an important influence on, found by numerous studies, work as institute
State the material in feed hopper temperature and moisture keep within the above range when, be conducive to the molding bonded of coal dust.Ability
Field technique personnel understand, can be carried out in the feed hopper to the process that temperature and moisture are adjusted, can also be at it
It is carried out in his processing procedure and/or coal dust transmission process, such as water content is adjusted so that the feed hopper when feed coal crushes
The moisture of interior material meets the requirements, and is heated to coal dust in coal dust transmission process so that material in the feed hopper
Temperature meets the requirements, and is well known in the art, and which is not described herein again.
In the forming method of the present invention, step d is that the material in the feed hopper is sent into former to be molded.
A preferred embodiment according to the present invention, the material in the feed hopper pass through spiral forced feeding machine and are sent into the molding
Equipment so that coal dust reduces volume when feeding in former, by the pressure of forced feeding spiral, the gas quilt of absorption
It squeezes out, to be conducive to further degassing.In the present invention, the forming method of material can be a variety of, such as extrusion forming, pressure
Shorten type or roll forming molding etc. into, the former accordingly can also there are many, to be known in the art, it is preferable that described
Former is two pairs of rollers briquetting forming machine；It is further preferred that when molding, line pressure between the two pairs of rollers of the two pairs of rollers briquetting forming machine
For 7t/cm~15t/cm, preferably 10t/cm~15t/cm, to improve molding effect.
Forming method according to the present invention, it is preferred that the forming method further includes e, part moulded coal is crushed to grain size
To be not more than 3mm, preferably 0.5~2.5mm, such as the coal particle of 1mm or 2mm, and the quality of pc in the feed hopper will be accounted for
The coal particle of 10wt%~40wt%, preferably 25wt%~30wt% are sent into the step of feed hopper.Research has been surprisingly found that, on
Coal particle is stated when with coal dust mixing aftershaping, the core of moulded coal skeleton can be become in pressing process, to effectively improve
The intensity of moulded coal.
Forming method according to the present invention, it is preferred that the forming method further includes f, matched before feed coal crushing
Coal, so that the coefficient that grinds of the feed coal is not less than 55%, preferably 60%~80%, for example, 65% or 75% step
Suddenly.Hardness and brittleness that coefficient has reacted feed coal can be ground, the study found that feed coal is ground coefficient adjustment extremely by coal blending
When in above range, be conducive to further increase subsequent forming effect.
Forming method according to the present invention, it is preferred that the forming method further includes g, enters feed hopper in the coal dust
Before, the step of coal dust feeding mixing chamber is stirred, is deaerated in advance, so that the density of the coal dust after pre- degassing is 0.6kg/
L~0.8kg/L.For example, being stirred to coal dust using Hermetical stirring storehouse, it is evacuated while stirring, in order to which the later stage is pressed into
Type.A preferred embodiment according to the present invention, using twin-screw batcher or Starlike valve by the coal dust in the mixing chamber
It is sent into the feed hopper.The twin-screw batcher and two class equipment of Starlike valve have extruding to make coal dust during pulverized coal conveying
With, advantageously reduce coal dust in transport process again absorption and entrained gas, realize the steady conveying of coal dust.
Compared with prior art, forming method of the invention has the following advantages：
1, forming method of the invention is wide to coal adaptability, even if to be molded the maximum no adhesion coal of difficulty as original
Expect coal, equally intensity can be made in the case where any adhesive need not be used>89% briquette prod；
2, binder is not added, cost is reduced, while also avoiding subsequently drying and drying course, promotes production effect
Rate；
3, forming method of the invention is conducive to interior when preparing activated carbon it is not necessary that feed coal to be crushed to too small grain size
The formation of portion's hole.
Specific implementation mode
The present invention is described in detail with reference to embodiments, but the present invention is not limited to this.
In following embodiment/comparative example, the characterizing method of relevant parameter is described as follows：
Average particle size-GB/T 19077.1-2008 grain size analysis laser diffractometries
The grindability index assay method (breathing out Dege Luo Fufa) of coefficient-GB/T 2565-2014 coals can be ground
Roller intensity-be measured according to GB/T7702.3-2008.
Remaining parameter is all made of national standard or this field conventional characterization mode is characterized.
In following embodiment/comparative example, the feed coal is one or more in following coal：
Hami coal, comes from Xinjiang Poly coal mine, and index is：Moisture 5.17wt%, air-dried basis ash content are
1.31wt%, dry ash free basis volatile matter 35.54wt%, caking index 2 belong to no adhesion coal, characteristic of char residue 3, can grind and are
Number 55%；
The long bituminous coal in Black Hills mining area, comes from Fauna From Toksun, Xinjiang Black Hills coal mine, and index is：Moisture 3.43wt%, is air-dried
Base ash content 3.52wt%, dry ash free basis volatile matter 37.16wt%, caking index 0 belong to no adhesion coal, characteristic of char residue 3,
Coefficient 68% can be ground.
In following embodiment/comparative example, the former is two pairs of rollers briquetting forming machine, manufacturer：BEPEX companies；
Model：MS150.
Embodiment 1
(1), Hami coal dust is broken to the coal dust that average grain diameter is 29 μm, is sieved, wherein grain size is more than 80 μm
Coal dust content be 2.5wt%；Coal dust content of the grain size more than 40 μm is 28wt%；
(2), the coal dust for obtaining (1) is sent into the feed hopper of compound stalk forming equipment, and to the material in the feed hopper
It is de-gassed, the negative pressure in the feed hopper is made to be maintained at 2.5kPa~3kPa；
(3), make the temperature of material in the feed hopper be maintained at 50 DEG C~55 DEG C, moisture be adjusted to 7wt~
8wt%；
(4), the material in the feed hopper is sent into former by spiral forced feeding machine be molded, is molded
When two pairs of rollers between line pressure be about 11~12t/cm, to obtain Forming press material (moulded coal).
Detect briquette strength, roller intensity (GB/T 7702.3-2008) 89.2%.
Embodiment 2
Difference from example 1 is that feed coal is Hami coal and the long bituminous coal in Black Hills mining area in mass ratio 1:1
Mixture.
Detect briquette strength, roller intensity (GB/T 7702.3-2008) 91.4%.
Embodiment 3
(1), by the long bituminous coal of Hami coal and Black Hills mining area in mass ratio 1:1 is uniformly mixed, and is crushed to average grain diameter
It for 35 μm of coal dust, is sieved, wherein coal dust content of the grain size more than 80 μm is 8.2wt%；Grain size is more than 40 μm of coal dust
Content is 22wt%；
(2), the coal dust that (1) obtains is sent into mixing chamber and is stirred degassing, mixing chamber top is equipped with pumping pipeline, makes to stir
Coal dust density after mixing reaches 0.60~0.65kg/L, and the coal dust in the mixing chamber is then sent into compound stalk forming through Starlike valve
The feed hopper of equipment.
(3), the material in the feed hopper is de-gassed, the negative pressure in the feed hopper is made to be maintained at 2.5kPa
~3kPa；
(4), make the temperature of material in the feed hopper be maintained at 80 DEG C~85 DEG C, moisture be adjusted to 2wt~
3wt%；
(5), the material in the feed hopper is sent into former by spiral forced feeding machine be molded, is molded
When two pairs of rollers between line pressure be about 11~12t/cm, to obtain Forming press material.
Detect briquette strength, roller intensity (GB/T 7702.3-2008) 91.8%.
Embodiment 4
(1), Hami coal dust is broken to the coal dust that average grain diameter is 22 μm, is sieved, wherein grain size is more than 80 μm
Coal dust content be 2wt%；Coal dust content of the grain size more than 40 μm is 15wt%；
(2), the coal dust obtained (1) is sent into the feed hopper of compound stalk forming equipment, and by moulded coal made from embodiment 1
It is crushed to the coal particle that grain size is 1mm~3mm, and will be described in the quality of pc 25wt% coal particles that accounted in feed hopper feeding
Feed hopper；
(3) material in the feed hopper is de-gassed, make the negative pressure in the feed hopper be maintained at 2kPa~
2.5kPa；
(4), make the temperature of material in the feed hopper be maintained at 50 DEG C~55 DEG C, moisture be adjusted to 5wt~
6wt%；
(5), the material in the feed hopper is sent into former by spiral forced feeding machine be molded, is molded
When two pairs of rollers between line pressure be about 11~12t/cm, to obtain Forming press material.
Detect briquette strength, roller intensity (GB/T 7702.3-2008) 92.6%.
Embodiment 5
(1), the coal dust that embodiment 4 obtains to be sent into mixing chamber and is stirred degassing, mixing chamber top is equipped with pumping pipeline,
The coal dust density after stirring is set to reach 0.75~0.80kg/L；
(2) coal dust in the mixing chamber is sent into the feed hopper of compound stalk forming equipment through twin-screw batcher, and will
Moulded coal made from embodiment 3 is crushed to grain size and is the coal particle of 1mm~3mm, and will account for the quality of pc in the feed hopper
35wt% coal particles are sent into the feed hopper.
(3), the material in the feed hopper is de-gassed, the negative pressure in the feed hopper is made to be maintained at 2.5kPa
~3kPa；
(4), make the temperature of material in the feed hopper be maintained at 70 DEG C~75 DEG C, moisture be adjusted to 2wt~
3wt%；
(5), the material in the feed hopper is sent into former by spiral forced feeding machine be molded, is molded
When two pairs of rollers between line pressure be about 11~12t/cm, to obtain Forming press material.
Detect briquette strength, roller intensity (GB/T 7702.3-2008) 94.3%.
Comparative example 1
Into Hami coal, then Hami coal dust is broken to average by spray water with adjusting its water content to 12wt%
Granularity is 8.1 μm, to obtain coal dust.Gained coal dust feeding former is being molded, line pressure is about between two pairs of rollers when molding
For 11~12t/cm, to obtain Forming press material.
Detect Forming press material intensity, roller intensity (GB/T 7702.3-2008) 90.4%.
Comparative example 2
Hami coal is crushed to 10mm particles below, the coal tar pitch of 10wt% is added, pulverizes and sieves and prepares granulating
Coal dust of the diameter at 64 μm~80 μm.The coal dust of gained is sent into former to be molded, line pressure is about between two pairs of rollers when molding
For 11~12t/cm, to obtain Forming press material.
Detect Forming press material intensity, roller intensity (GB/T 7702.3-2008) 85%.
Comparative example 3
Hami coal is pulverized and sieved and is prepared into grain size in 64 μm~80 μm of coal dust, the coal tar of 30wt% is added.
After being stirred evenly in blender, into plodder, it is prepared into standard size moulded coal.Dry 48 hours at 20 DEG C, then in
It is dried 2 hours at 200 DEG C.
Detect Forming press material intensity, roller intensity (GB/T 7702.3-2008) 91.8%.
Claims (15)
1. a kind of fine coal high intensity forming method of binder free, which is characterized in that the forming method includes：
A, the average grain diameter of the step of crushing feed coal to obtain coal dust, the coal dust is not less than 20 μm, wherein grain size
Coal dust content no more than 80 μm is not less than 90wt%；The coal dust content that grain size is 40 μm~80 μm is not less than 10wt%；
B, the coal dust for obtaining step a is sent into the feed hopper of compound stalk forming equipment, and is carried out to the material in the feed hopper
The step of degassing process；
C, make the regulating step that the temperature of material in the feed hopper is 50 DEG C~100 DEG C, moisture is 2wt%~8wt%；
With
D, the material in the feed hopper is sent into former to be molded, the step of to obtain moulded coal.
2. forming method according to claim 1, which is characterized in that the forming method further includes e, breaks part moulded coal
It is coal particle no more than 3mm to be broken to grain size, and by the coal of the quality of pc 10wt%~40wt% accounted in the feed hopper
Grain is sent into the step of feed hopper.
3. forming method according to claim 2, which is characterized in that in step e, part moulded coal, which is crushed to grain size, is
The coal particle of 0.5~2.5mm.
4. forming method according to claim 1 or 2, which is characterized in that in step d, the material in the feed hopper is logical
It crosses spiral forced feeding machine and is sent into the former.
5. forming method according to claim 4, which is characterized in that the former is two pairs of rollers briquetting forming machine.
6. forming method according to claim 5, which is characterized in that when molding, the two pairs of rollers of the two pairs of rollers briquetting forming machine
Between line pressure be 7t/cm~15t/cm.
7. forming method according to claim 6, which is characterized in that when molding, the two pairs of rollers of the two pairs of rollers briquetting forming machine
Between line pressure be 10t/cm~15t/cm.
8. forming method described in any one of claim 1 to 3, which is characterized in that the forming method further include f,
Coal blending is carried out before feed coal crushes, so that the coefficient that grinds of the feed coal is not less than 50% step.
9. forming method according to claim 8, which is characterized in that in step f, coal blending is carried out before feed coal crushes,
So that the coefficient that grinds of the feed coal is 60%~80%.
10. forming method according to claim 8, which is characterized in that the forming method further includes g, in the coal dust
Into before feed hopper, the step of coal dust feeding mixing chamber is stirred, is deaerated in advance, so that coal dust after pre- degassing is close
Degree is 0.6kg/L~0.8kg/L.
11. forming method according to claim 10, which is characterized in that will be described using twin-screw batcher or Starlike valve
Coal dust in mixing chamber is sent into the feed hopper.
12. forming method described in any one of claim 1 to 3, which is characterized in that in the coal dust obtained by step a, grain
Coal dust content of the diameter no more than 80 μm is not less than 95wt%；Coal dust content of the grain size no more than 40 μm is not less than 70wt%.
13. forming method described in any one of claim 1 to 3, which is characterized in that in step b, in the feed hopper
Negative pressure be 0~3kPa.
14. forming method according to claim 13, which is characterized in that in step b, the negative pressure in the feed hopper is
2.5kPa~3kPa.
15. forming method described in any one of claim 1 to 3, which is characterized in that in step c, make the feed hopper
The temperature of interior material is 70 DEG C~85 DEG C, moisture is 2wt%~6wt%.
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| CN109628188A (en) * | 2019-01-07 | 2019-04-16 | 武汉钢铁有限公司 | The forming method of the dry coking coal of bindless |
| CN110358601A (en) * | 2019-07-25 | 2019-10-22 | 内蒙古万众炜业科技环保股份公司 | A kind of production technology of small particle mechanism semi-coke charcoal for roasting |
| CN112920869A (en) * | 2021-01-25 | 2021-06-08 | 湖北省煤炭投资开发有限公司 | Briquette coal preparation method and preparation system |
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