CN1039130C - Process for preparing concentrated coal dispersions in water, and trasporting them through pipelines - Google Patents
Process for preparing concentrated coal dispersions in water, and trasporting them through pipelines Download PDFInfo
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- CN1039130C CN1039130C CN 93102059 CN93102059A CN1039130C CN 1039130 C CN1039130 C CN 1039130C CN 93102059 CN93102059 CN 93102059 CN 93102059 A CN93102059 A CN 93102059A CN 1039130 C CN1039130 C CN 1039130C
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- viscosity
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Abstract
A process for preparing and transporting concentrated dispersions of coal in water vibn a pipes through a particular manner of adding the dispersant additive is described. This process also makes it possible to improve the stability of the suspension during storage.
Description
The method that the present invention relates to prepare the condensed water coal suspension liquid and pass through the described suspension of pipe-line transportation.
Fine broken coal concentrated suspension liquid in the water (maximum diameter 300≤μ m) (claiming CWM), it need not primary dewatering can directly supply with boiler, it is disclosed for example to resemble No. 2099451, English Patent, constituted one in order it to be converted contain to the significant selection of coal fuel, therefore the fuel oil work of described boiler can not use solid fuel.
When coal is grown Distance Transmission from the digging place to the field of employment, be provided with the suspension preparation device in the digging place, be especially favourable from using this suspension with environment economically.
In total system, change in order to compensate the cycle of producing and using, be provided with the hold tank of water coal suspension liquid in the initial sum terminal station of coal transport pipe, its period of storage can period of greater than two months.
The most important technical feature of CWM is combustionproperty and pumping and package stability.Therefore, an optimum formula should be considered these performances, and, in order to keep limited cost, should make additional additive capacity minimum simultaneously.
The high coal concentration (〉=60%, best 〉=70% weight ratio) that suspension can be acted as a fuel only can be by using dispersion agent and selecting suitable size distribution to obtain.
What can be used as dispersion agent has, negatively charged ion and cats product, polymer nonionic thing (for example from alkylphenol or aklylene glycol or Alkylenediamine deutero-alkylene oxide copolymer) and polyelectrolyte especially comprise the aromatic hydrocarbons part that the multinuclear alkyl replaces and the sulfonated surfactants that surpasses 300 higher molecular weight are arranged.Wherein, the present invention enumerated with the alkyl naphthalene sulfonic acid salts of monovalent of formaldehyde condensation and wherein trade name be the known compound of Daxad15 (W, R, Grace) and Fluidix05 (Bozzetto).
Under other conditions were identical prerequisite, the viscosity of suspension depended on the addition of dispersion agent.Originally, viscosity reduces with the increase of addition.Because dispersion agent is represented out significant cost (cost of about 30% suspension product), add the restriction that additive should be suitable, up to obtaining minimum viscosity number.
In the time of on additive capacity is increased to optimum value, no longer can obtain mobile improvement; Otherwise can observe viscosity increase in a small amount in many cases, and the cost of product has increased.Under the situation of unfavorable prescription, suspension viscosity time to time change in the well-known long pumping operation, because pumping causes the consumption of additive, cause free additive concentration minimizing in the aqueous solution, additive can be separated from suspension by centrifugal or filtering suspension liquid (consults Britain, Stratford upon Avon, the international proceedings of " waterpower transmits solid in pipeline " 1988 o. 11ths).
If not under the Be Controlled situation, because the increase of the described viscosity that depletion of additive causes, the viscosity of suspension can reach so high degree in pumping, so that suspension becomes and is difficult to pumping.
Up to the present knownly added excessive dispersion agent for the method (seeing German Patent 3,621,319) of improving pumping stability is included in shredding stage, this amount surpasses the top optimum quantity that defines for the acquisition minimal viscosity.Owing to carry required excessive additive to depend on many factors, especially the physics of coal and chemical property (for example, chemical constitution, the surface a hydrophilic lipophilic balance (HLB), water-absorbent, mechanical endurance, size distribution, particle shape, porosity), mixture character (as solids concentration, rheological, gathering or degree of flocculation) and in course of conveying the hydrokinetics situation, comprise passage by pump, obviously thisly excessively only can be determined by approximate.
Consideration is estimated the suitable damage that causes from supporting, and in fact adopts conservative standard, so that addition is often above the accurate necessary amounts that is considered to be used to carry.
In fact, be required (German Patent 3621319AL) amount up to 800% dispersion agent for the amount (minimal viscosity amount) that may obtain minimal viscosity.When we may do like this, or even in the presence of stabilization additives, will cause producing tangible negative interaction aspect the suspension static stability.
We have found the method for the shortcoming that overcomes the prior art existence now.In fact according to the inventive method, coal-water mixture need not use excessive dispersion agent to get final product pumping and stable storage.
Therefore, the present invention relates to prepare and pass through the method for the spissated water coal mixtures of pipe-line transportation, it comprises:
---by the step of wet-milling slurrying in the presence of one or more dispersion agents;
---by the supplying step of one or more pumping plants through pipeline; It is characterized in that:
---in the slurrying step, add in order to obtain the minimum addition of the necessary dispersion agent of minimal viscosity, minimal viscosity is 10 seconds in mobile shearing rate
-1Under be 0.8 to 1.5 the pool (Pas).
---in the pumping step, a or many parts of more dispersion agents of ground interpolation are lower than 30% of original coal slurry viscosity value with the increase that limits viscosity with some amount.
In preferred embodiment, the additive that adds in the pumping step will make the increase of viscosity of coal slurry can be restricted to less than 20% of original coal slurry viscosity value.
The available viscometer control that is installed on the pipeline of the interpolation of additive in coal slurry pumping step, viscometer starts the additive measuring apparatus when viscosity surpasses in advance limit value, and preferably viscometer and the additive measuring apparatus on the pipeline is positioned in pumping plant: the turbulent flow that causes by pump channel makes the dispersion agent that adds in the suspension flow obtain good dispersion.
Term " coal water enriched mixture " refers to the liquid suspension of fine crushed solid fuel, and wherein said solid fuel is the compound of brown coal, sub-bituminous coal, low rank bituminous coal, hard coal, coking coal and the thermal treatment by coal other products, petroleum products coke, graphite and other high-carbon contents that obtain.
Coal also can especially obtain (referring to United States Patent (USP) 4,776,859) through the selectivity agglomeration process from demineralize and/or sweetening process.Suspension of the present invention can comprise, and for example from 40% to 85%, best from 55% to 80% solid fuel, it has mean diameter≤200 μ m, the size distribution of best≤50 μ m.Especially preferably the particle by two groups of different mean sizess constitutes two peak size distribution, and wherein first group mean sizes is in the scope of 200 to 50 μ, and the mean sizes of second groups of grains is in 1 to 40 mu m range.
Yet specific purposes of the present invention are forms of the interpolation of dispersion agent, in the slurrying step, only add a part of additive in view of the above, promptly, this part is corresponding to the minimal viscosity value of being determined by solid composition type in suspension and concentration, the remainder of additive adds in the pumping step and as more part subsequently, and only just adds when viscosity has surpassed 5% to 50% predetermined amount of mobile pumping viscosity.
Amount at the added dispersion agent of pumping process is to change according to parameter above-mentioned.
As dispersion agent, can use anionic, cationic, non-ionic and the amphoteric compound, or they are as independent compound, perhaps as mixture.Better be the anionic sulfonated dispersion agent that can be used as basic metal or ammonium salt use, be more preferably and the naphthene sulfonic acid ammonium salt of formaldehyde condensation or the alkali metal salts or ammonium salt of sulfonated alkyl naphathalene.
In the CWM preparation process, be many parameters for the highest mobile necessary minimum is arranged, the especially type of coal, its concentration in coal slurry, the function of additive types.
For described purpose, in order to obtain the highest flowability at the preparatory phase that concentrates coal slurry, the minimum concentration of the sulfonation additive of the naphthalenesulfonate type of necessary and formaldehyde condensation is 0.4% to 1.5% for whole coal slurry weight.
Purpose for example is that the minimum concentration of the necessary Daxad15 of minimal viscosity of 62% suspension is 1.0% (weight) (based on a suspensoid weight) in order to obtain weight content in coal, and described coal is just like the described feature of table 1.
Except water, outside solid fuel and the dispersion agent, suspension of the present invention can comprise that the water-soluble machine material that is mixed with is (as, such C such as weevil alcohol, ethanol
1-C
6Fatty alcohol), foam preventer, stabilization additives (as the disclosed wilkinite of italian patent 20456A/85, polysaccharide, yellow source glue and polyacrylamide), biocides and other fluids or semi-fluid fuel (as fuel oil, petroleum residue, petroleum naphtha, gas oil or the like).
The production method of suspension of the present invention can be undertaken by different step, seems English Patent 2,099 most, No. 451 disclosed employing two step wet-milling steps.
With compare by once adding the solution that dispersion agent constitutes at the coal slurry preparatory phase, the advantage that the invention provides method is that coal slurry has higher static stability under identical pump-conveying property condition, can be in originating station and terminal station long storage.
Following Example is used for better illustrating the present invention.
Embodiment
The various aq suspensions of Colombia's bituminous coal (its character sees Table 1) prepare (as English Patent 2 with two step wet milling processs, 099,451 is disclosed)---use Daxad15 as dispersing additive (hereinafter to be referred as " D15 "), and under kindred circumstances wilkinite as stabilization additives.Milling time is so controlled so that reached for all suspension has same size distribution, it is characterized in that having the mean diameter and the sieve top that surpasses 200 μ m with 7.0 ± 0.5% of 20 ± 1 μ m.
The viscosity of suspension was in order to 10 seconds
-1For long distance is carried the rotary viscosity measuring of the standard operation of shearing rate.
(derive from AICHE magazine nineteen fifty-seven rolls up the method that 3 No. 1 page 3 Metzner and Otto provide and described in the past suspension pumping performance by laboratory test simulation, i.e. the 11st the international proceedings of " at Guan Zhongyong waterpower transmission solid "), suspension is handled with the constant speed of rotation in this test, and suitable like this shearing rate is 10 seconds
-1, and the continuously measured moment of torsion.By suitably calibrating with known viscosity fluid, torque signal is converted into viscosity.
Experimental result is with for required time of the viscosity number of twice that reaches the initial viscosity value or be used in after the predetermined churning time, summarizes with respect to the percentage that the viscosity of initial viscosity value increases indicatively.
Simulate above pump-conveying property resembles under the low shear rate value, but be 1 second being equivalent to shearing rate
-1Speed of rotation under turn round.Sediment height when the end of stirring test penetrates described sediment by the rigidity perspex bar with 15 grammes per square metres and is estimated (" excellent penetration test "), and this highly is used to estimate the stability (rolling up the 175th page in 1985 31 as Britain's chemical industry magazine) of coal suspension liquid.
Test-results is summarized by the height of the heavy sediment of supporting rod.
Estimate static stability by the settling test in Glass tubing (internal diameter 40mm uses height 450mm) under 20 ℃ of constant temperature.When 60 days period of storage of fixed finished, thing was subdivided into three parts in the pipe: head, centre and bottom, and for each part, the concentration of solid matter is determined with gravity method.This test-results is indicated with parameter " sedimentation percentage " %S, following calculating:
%S=(C
F-C
On average) * 100/ (C
Maximum-C
On average)
C
On average=(C
T+ C
M+ C
F)/3 are C wherein
T, C
M, C
FBe respectively the concentration of solids in head, centre and bottom; C
MaximumThe maximum that is solids is heaped concentration, (being equivalent to 49.000 times universal gravity constant) that it obtains at the bottom section of testing tube by leave heart separate out suspended liquid 20 minutes with per minute 20.000.
When so being limited, throw out percentage % can be in 0 to 100 range, and 0 expression has uniform concentration distribution (C
T=C
M=C
F) completely stable suspension, 100 the expression completely unstable suspension, C
F=C
MaximumUnder latter event, the performance of sediment resembles solid, but obviously no longer pumping.
Table 1
The characteristic of coal
Moisture content 6.1%-W
Volatile matter 36.4%-W
Ash 6.6%-W
Fixed carbon (different) 50.9%-W
Carbon 69.9%-W
Hydrogen 5.4%-W
Nitrogen 1.5%-W
Sulphur 0.6-W
Oxygen (different) 16.0%-W
Total heating value 28,800 kilojoule per kilogram
* %-W=weight percent
Example 1;
Preparation comprises five kinds of aq suspensions of the D15 of inferior coal of 62.0% taxi driver brother's rival and variable, and this coal has the feature of table 1 expression.For the optimum quantity that obtains minimal viscosity value D15 is 1.0% (seeing Table 2).
Table 2 suspension numbering D15 concentration was at 10 seconds
-1
The viscosity (pool) of (based on suspension and weight %)
1 0.5 10
2 0.7 2.8
3 1.0 1.20
4 1.2 1.21
5 1.5 1.29
Example 2
Suspension numbering 2,3,4 and 5 is carried out the stability and the settling test of pump.Increase with the increase of D15 amount under identical agitation condition with the pumping stability that viscosity number is reached double initial viscosity value required time to be represented.On the contrary, static stability reduces (seeing Table 3) with the increase of D15
Table 3 suspension numbering pumping stability sediment
(hour) (%)
2 31 12
3 270 18
4 430 75
5 673 89
Example 3
Suspension No. 3 (seeing Table 2) corresponding to the minimal viscosity value is tested through the simulation pumping, wherein, in case viscosity increases at 5% o'clock with respect to the initial viscosity value, adds other a dispersion agent by drop-burette in suspension.This test was carried out in predetermined 270 hours, was equal to the test period of the same suspension No. 3 (tables 3) that does not add dispersion agent of embodiment 2.The total amount of D15 (that is, the addition of preparatory phase D15 adds the addition of duration of test D15) counts 1.2% with the weight of suspension.
Result with identical churning time reports in table 4, comprising those results that obtained by example 2 (wherein all additives add machine in preparation process).Explained stirring percentile increase of viscosity after 270 hours in the third column of table 4.In the total amount of D15 is under the identical prerequisite (1.2% weight), obtains the stirring stability of equivalence.
Table 4
The increasing amount of total concn (weight percent) viscosity of suspension numbering D15
3 1.0 100％
3+ annexation 1.2 5%
4 1.2 5％
5 1.5 0％
Example 4:
To carrying out the static stability test through the sample of testing as simulation pumpings in 270 hours of example 3, its expression of results is in table 5.
The D15 total amount is identical, obtains the steady stability value of equivalence.
We remind, and before the pumping step, compare for No. 4 with suspension, and suspension demonstrates higher sedimentation stability (seeing Table 3) for No. 3.
Table 5
After suspension D15 total concn (weight percent) stirring test
The sedimentation percentage
3+ annexation 1.2 16%
4 1.2 18％
5 1.5 85％
Have No. 5 phase inverse ratios of the suspension suspension 3 of a large amount of D15 and obtain much smaller stability No. 4.
Example 5 (comparative example)
To No. 3,4 and 5, suspension, the simulation test of carrying out the low shear rate pumping of 270 hour scheduled time, the gained expression of results is in table 6.
Have No. 5, the suspension of big excessive D15, show the sedimentation sign.
Table 6
Suspension numbering D15 concentration (weight percent) settling height (millimeter)
3 1.0 0
4 1.2 0
5 1.5 8
Example 6 (comparative example)
Four kinds of identical viscosities are (at 10 seconds
-1The time 1.20 pools) and the suspension of the D15 (1.2 weight) of same content prepare with the coal of different amounts and the wilkinite of a stabilizer function.Use bentonite content based on suspension about 1.5%, but with coal content descend in a large number (being reduced to 57% from 62 by weight) be that cost just can obtain No. 3, suspension, promptly possess the identical static stability of the suspension of minimal viscosity value (referring to table 2).For the suspension of the coal that 57% weight is only arranged, because its low heat value will be difficult to produce burning.
Its result is illustrated in the table 7.Table 7 suspension numbering coal concentration (weight percent) wilkinite concentration precipitation (%)
(weight percent)
3* 62.0 does not have 18
6 60.5 0.5 50
7 58.9 1.0 25
8 57.2 1.5 15
9 55.5 2.0 9
* D15=1.0 (weight) is a benchmark with suspension
(with 1.2% (other suspension of weight are compared for 6,7,8 and No. 9)
Claims (3)
1. preparation method who is suitable for the concentrated coal-water mixture of pipe-line transportation, it comprises:
-slurrying step by wet-milling in the presence of one or more dispersion agents;
-by one or more pumping plants, by the step of pipe-line transportation;
It is characterized in that:
-in the slurrying step, adding for obtaining minimal viscosity is essential minimum dispersion agent, this minimal viscosity is 10 seconds in shearing rate
-1Situation under be 0.8 to 1.5 the pool;
-in the pumping step, a part or many parts ground add the interpolation dispersion agent, and the increase that its quantity will limit viscosity is lower than 30% of initial viscosity of coal slurry;
Wherein dispersion agent is and the naphthene sulfonic acid of formaldehyde condensation or the alkali metal salts or ammonium salt of alkyl naphthalene sulfonic acid.
2. according to the process of claim 1 wherein in the pumping stage, the additive that adds with respect to initial viscosity of coal slurry makes the increase of viscosity of coal slurry be limited to be lower than 20%.
3. according to the method for claim 1 or 2, wherein, the interpolation of dispersion agent is by the viscometer control that is installed on the pipeline in coal slurry pumping step, and when predetermined viscosity number was exceeded, viscometer started the additive measuring apparatus.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT92A000159 | 1992-01-29 | ||
| ITMI92A000159 | 1992-01-29 | ||
| ITMI920159A IT1260465B (en) | 1992-01-29 | 1992-01-29 | Process for the preparation and transport of concentrated dispersions of coal in water via pipes |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1075743A CN1075743A (en) | 1993-09-01 |
| CN1039130C true CN1039130C (en) | 1998-07-15 |
Family
ID=11361707
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 93102059 Expired - Fee Related CN1039130C (en) | 1992-01-29 | 1993-01-29 | Process for preparing concentrated coal dispersions in water, and trasporting them through pipelines |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN1039130C (en) |
| IT (1) | IT1260465B (en) |
| RU (1) | RU2100267C1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| PL2365993T3 (en) * | 2008-03-26 | 2017-12-29 | Ecopuro, Llc | Structurally enhanced plastics with filler reinforcements |
| CN109809192A (en) * | 2018-12-10 | 2019-05-28 | 北京矿冶科技集团有限公司 | A kind of tailings paste pipe-line transportation system and method |
| CN111575060B (en) * | 2020-05-29 | 2021-06-22 | 新奥科技发展有限公司 | Coal water slurry gasification system and coal water slurry additive recovery method |
-
1992
- 1992-01-29 IT ITMI920159A patent/IT1260465B/en active IP Right Grant
-
1993
- 1993-01-28 RU RU93004505A patent/RU2100267C1/en active
- 1993-01-29 CN CN 93102059 patent/CN1039130C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1075743A (en) | 1993-09-01 |
| IT1260465B (en) | 1996-04-09 |
| RU2100267C1 (en) | 1997-12-27 |
| ITMI920159A1 (en) | 1993-07-30 |
| ITMI920159A0 (en) | 1992-01-29 |
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