CN101173765B - Method for preparing high concentration water-coal-slurry by low-rank coal - Google Patents

Method for preparing high concentration water-coal-slurry by low-rank coal Download PDF

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CN101173765B
CN101173765B CN2007101883967A CN200710188396A CN101173765B CN 101173765 B CN101173765 B CN 101173765B CN 2007101883967 A CN2007101883967 A CN 2007101883967A CN 200710188396 A CN200710188396 A CN 200710188396A CN 101173765 B CN101173765 B CN 101173765B
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coal
slurry
wet type
water
lapping
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CN101173765A (en
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何国锋
段清兵
王国房
贾传凯
梁兴
纪磊
刘解
王秀月
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Beijing Tiandi Sunac Technology Co.,Ltd.
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BEIJING HAIDIAN HUAMEI COAL SLURRY TECHNOLOGY DEVELOPMENT CENTER
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Abstract

The invention relates to a method of utilizing low-rank coal to prepare high concentration coal water slurry, which comprises the following steps: step one, super-fine smashup is operated to the low-rank coal; step two, coal particles after being smashed up are mixed with water according to the mass proportion of 6 to 8: 4 to 2; step three, the wet rough grinding is operated to mixture; step fourth, (1), 10 to 30 percent of total weight of the coal water slurry after being roughly ground is mixed with the water according to the mass proportion of 5:1 to 2, and then the wet fine grinding is operated to the mixture; (2), except the coal water slurry after being finely ground in a wet type, the coal water slurry after being roughly ground in a wet type is delivered into a filtering device; step five, the coal water slurry after being finely ground in the step four (1) is treated according to the following way: (1), all coal water slurry is returned to step three to be circularly and roughly ground or (2) the partial coal water slurry is returned to step three to be circularly and roughly ground, and the other part coal water slurry after being finely ground is directly delivered intothe filtering device; or (3) all coal water slurry is directly delivered into the filtering device; six step, the coal water slurry delivered into the filtering device is filtered by a filtering net with 18 to 20 meshes, the coal water slurry is stirred in high gear and then stewed, or the coal water slurry is stirred in low speed to obtain the high concentration coal water slurry product.

Description

A kind of method of utilizing low-order coal to prepare high-concentration coal-water slurry
Technical field
The present invention relates to a kind of method for preparing water-coal-slurry, particularly about a kind of method of utilizing low-order coal to prepare high-concentration coal-water slurry.
Background technology
At present, international oil price is high, and fuel resource shortage day by day, and water-coal-slurry is the ideal substitute of fuel oil.The concentration of water-coal-slurry and granularity directly influence the effect that water-coal-slurry substitutes fuel oil.In the preparation process of water-coal-slurry, pulping process has important effect, and the quality of pulping process directly has influence on the final preparation concentration of water-coal-slurry and the energy consumption and the expense of slurrying.Utilize conventional pulping process to prepare high-concentration coal-water slurry, often will select the coal (water content is low) of easy pulping, and account for the low-order coal of coal in China reserves proportion maximum, be in the state that does not utilize because the water content height is listed in the coal that is difficult for pulping.
The method of utilizing low-order coal (water content height) to prepare high-concentration coal-water slurry mainly is to reduce the water content of coal.The utilization that proposes as Chinese patent CN1081201A is being lower than the critical-temperature of water (523～647.3K) and carbon monoxide and water when existing, the high low-order coal of water content is carried out hydrothermal treatment consists (after 0.2～6h), hole wall has hydrophobicity in the coal, coal body becomes fine and close simultaneously, the water content of coal is reduced, contain the high water-coal-slurry of coal amount thereby prepare.This method can improve and decrease the water content of low-order coal effectively, but this method adopts high processing temperature and long processing time, with the lower temperature of industrial requirement and short time be contrary, thereby limited the water-coal-slurry that low-order coal is widely used in the preparation high concentration.
Summary of the invention
At the problems referred to above, the purpose of this invention is to provide a kind ofly under room temperature and short period condition, utilize low-order coal to prepare the method for high-concentration coal-water slurry.
For achieving the above object, the present invention takes following technical scheme: a kind of method of utilizing low-order coal to prepare high-concentration coal-water slurry, and it may further comprise the steps: (1) carries out super fine crushing to the low order raw coal, until coal particle size≤3mm; (2) with the coal grain after the fragmentation and water by 6～8: 4～2 mass ratio mixes; (3) mixture to step (2) carries out the wet type rough lapping, makes the coal particle size≤1000 μ m in the coal slurry that forms after the rough lapping, and the coal grain less than 75 μ m accounts for more than 50% of dry coal gross mass in the coal slurry; (4) will adopt following dual mode processing through the coal oar of wet type rough lapping: 1. 10%～30% of the coal slurry total amount after the wet type rough lapping is mixed by 5: 1～2 mass ratio with water, then this mixture is carried out the wet type fine lapping, make the coal particle size≤30 μ m in the coal slurry after the wet type fine lapping; The coal oar that 2. will mix with water after the wet type rough lapping of carrying out beyond the wet type fine lapping is directly sent into filter; (5) will through step (4) 1. the coal oar that carries out after the wet type fine lapping of kind mode adopt following three kinds of modes to handle: 1. the coal oar after the wet type fine lapping is all returned step (3) rough lapping that circulates; Perhaps, 2. the coal oar after a part of wet type fine lapping is returned step (3) rough lapping that circulates, the coal oar after the fine lapping of another part wet type is directly sent into filter; Perhaps, 3. the coal oar after the wet type fine lapping is all directly sent into filter; (6) coal slurry that will send into filter filters through 18～20 purpose screen packs, carries out high-speed stirred again in agitating device, leaves standstill, and perhaps obtains the high-concentration coal-water slurry product after the stirring at low speed.
One or many adds additive in described step (2), and the addition of described additive accounts for 0.2%～2% of dry coal quality in the described water-coal-slurry.
Described additive comprises dispersant and stabilizing agent; Described dispersant is selected from one or more of naphthalene sulfonate, lignosulfonates, humic acid and olefines, and described stabilizing agent is selected from one or more of carboxymethyl cellulose, attapulgite clay and inorganic salts.
The present invention is owing to take above technical scheme, it has the following advantages: 1, the inventive method can be at ambient temperature, by the classified grinding mode of wet type rough lapping and wet type fine lapping, improve the size distribution of coal grain in the water-coal-slurry, prepare the high-concentration coal-water slurry that can carry out industrial applications.2, the inventive method has realized the technological requirement of " many broken few mills " by super fine crushing, has reduced the preparation energy consumption of water-coal-slurry significantly.3, the inventive method is the continous way production technology, makes to utilize low-order coal to prepare water-coal-slurry on a large scale to become possibility.
Description of drawings
Fig. 1 is the flow chart of technology of the present invention
The specific embodiment
Below in conjunction with drawings and Examples, the inventive method is described in detail.
As shown in Figure 1, the inventive method may further comprise the steps:
(1) the low order raw coal is carried out super fine crushing, until coal particle size≤3mm;
(2) with the coal grain after the fragmentation and water by 6～8: 4～2 mass ratio mixes;
(3) mixture to step (2) carries out the wet type rough lapping, makes the coal particle size≤1000 μ m in the coal slurry that forms after the rough lapping, and the coal grain less than 75 μ m accounts for more than 50% of dry coal gross mass in the coal slurry;
(4) will adopt following dual mode to handle through the coal oar of wet type rough lapping:
1. 10%～30% of the coal slurry total amount after the wet type rough lapping is mixed by 5: 1～2 mass ratio with water, then this mixture is carried out the wet type fine lapping, make the coal particle size≤30 μ m in the coal slurry after the wet type fine lapping;
The coal oar that 2. will mix with water after the wet type rough lapping of carrying out beyond the wet type fine lapping is directly sent into filter;
(5) will through step (4) 1. the coal oar that carries out after the wet type fine lapping of kind mode adopt following three kinds of modes to handle:
1. the coal oar after the wet type fine lapping is all returned step (3) rough lapping that circulates; Perhaps,
2. the coal oar after a part of wet type fine lapping is returned step (3) rough lapping that circulates, the coal oar after the fine lapping of another part wet type is directly sent into filter; Perhaps,
3. the coal oar after the wet type fine lapping is all directly sent into filter;
(6) coal slurry that will send into filter filters through 18～20 purpose screen packs, carries out high-speed stirred again in agitating device, leaves standstill, and perhaps obtains the high-concentration coal-water slurry product after the stirring at low speed.
Adopt in the high-concentration coal-water slurry of the inventive method preparation, the quality of coal grain accounts for more than 55% of water-coal-slurry gross mass.
Among the above-mentioned preparation method, can add additive in step (2), the amount that additive adds accounts for 0.2%～2% of dry coal quality in the water-coal-slurry, and additive can once add, and also can repeatedly add.
Among the above-mentioned preparation method, the 2. described part in the step (5) is according to the paste-forming properties of various coals and the decision of required coal-water fluid concentration.
Described additive is dispersant and stabilizing agent; Described dispersant can adopt one or more of naphthalene sulfonate, lignosulfonates, humic acid and olefines etc., and described stabilizing agent is selected from one or more of carboxymethyl cellulose, attapulgite clay and inorganic salts etc.
In the above-mentioned steps (6), the mesh of filter is 18～20 orders.
Embodiment 1:
The low order raw coal that present embodiment is used is a last gulf coal, and its water content is 7.5%.It is as follows to utilize this coal to prepare the process of high-concentration coal-water slurry:
(1) will go up the gulf coal and carry out super fine crushing, reach 1mm until coal particle size;
(2) the last gulf coal grain after the fragmentation is mixed with the mass ratio of water by 7: 3, then mixture is sent into kibbling mill and carried out the wet type rough lapping, make kibbling mill go out coal particle size≤800 μ m in the coal slurry of interruption-forming, coal particle size accounts for more than 60% of dry coal gross mass less than the particle of 75 μ m in the coal slurry;
(3) 20% of kibbling mill exit coal slurry flow is mixed with the mass ratio of water by 10: 3, then mixture is sent into atomizer mill and carried out the wet type fine lapping, make the coal particle size≤20 μ m in the coal slurry of atomizer mill outlet;
(4) send 50% of the coal slurry amount after the wet type fine lapping back to the rough lapping that circulates in the kibbling mill;
(5) after the wet type fine lapping, part is not sent the coal slurry that coal slurry and kibbling mill in the kibbling mill export after the circulation rough lapping back to and is mixed, and enters next step then;
(6) coal slurry that step 5 is obtained, successively by 20 order rotary screens filter, holding vessel by belt stirrer carries out high-speed stirred, stirring at low speed, then obtains the water-coal-slurry product of high concentration.
In the water-coal-slurry product of present embodiment preparation, the quality of coal particle accounts for more than 60% of water-coal-slurry gross mass.
Be performances such as the flowability of further improving water-coal-slurry, stability, can add additive at the inlet of kibbling mill, additive is dispersant and stabilizing agent, and the addition of additive accounts for 0.5% of dry coal quality in the water-coal-slurry.The dispersant that present embodiment adds is a naphthalene sulfonate, and the stabilizing agent of adding is an attapulgite clay.
Embodiment 2:
The low order raw coal that present embodiment is used is Chifeng's coal, and its water content is 14%.It is as follows to utilize this coal to prepare the process of high-concentration coal-water slurry:
(1) Chifeng's coal is carried out super fine crushing, reach 1mm until coal particle size;
(2) the Chifeng's coal grain after the fragmentation is mixed with the mass ratio of water by 6: 4, then mixture is sent into kibbling mill and carried out the wet type rough lapping, make kibbling mill go out coal particle size≤1000 μ m in the coal slurry of interruption-forming, coal particle size accounts for more than 50% of dry coal gross mass less than the particle of 75 μ m in the coal slurry;
(3) 10% of kibbling mill exit coal slurry flow is mixed with the mass ratio of water by 5: 1, then mixture is sent into atomizer mill and carried out the wet type fine lapping, make the coal particle size≤20 μ m in the coal slurry of atomizer mill outlet;
(4) the coal oar after the wet type fine lapping mixes with the coal slurry of kibbling mill outlet, enters next step then;
(5) coal slurry that step (4) is obtained, successively by 20 order rotary screens filter, holding vessel by belt stirrer carries out high-speed stirred, stirring at low speed, then obtains the water-coal-slurry product of high concentration.
In the water-coal-slurry product of present embodiment preparation, the quality of coal particle accounts for more than 55% of water-coal-slurry gross mass.
For performances such as the flowability of further improving water-coal-slurry, stability, can add additive at twice at the inlet of kibbling mill and the inlet of atomizer mill, each amount that adds accounts for 50% of additive total demand.Additive is dispersant and stabilizing agent, and the addition of additive accounts for 0.2% of dry coal quality in the water-coal-slurry.The dispersant that present embodiment adds is a naphthalene sulfonate, and the stabilizing agent of adding is a carboxymethyl cellulose.
Embodiment 3:
The low order raw coal that present embodiment is used is a Harrar ditch coal, and its water content is 5%.It is as follows to utilize this coal to prepare the process of high-concentration coal-water slurry:
(1) Harrar ditch coal is carried out super fine crushing, reach 1mm until coal particle size;
(2) the Harrar ditch grain after the fragmentation is mixed with the mass ratio of water by 8: 2, then mixture is sent into kibbling mill and carried out the wet type rough lapping, make kibbling mill go out coal particle size≤800 μ m in the coal slurry of interruption-forming, coal particle size accounts for more than 60% of dry coal gross mass less than the particle of 75 μ m in the coal slurry;
(3) 30% of kibbling mill exit coal slurry flow is mixed with the mass ratio of water by 5: 2, then mixture is sent into atomizer mill and carried out the wet type fine lapping, make the coal particle size≤15 μ m in the coal slurry of atomizer mill outlet;
(4) the coal oar after the wet type fine lapping is all returned step (3) rough lapping that circulates;
(5) the coal oar that will mix with water after the wet type rough lapping of carrying out beyond the wet type fine lapping is directly sent into filter;
(6) will send into the coal slurry of filter, successively by 18 order rotary screens filter, holding vessel by belt stirrer carries out high-speed stirred, stirring at low speed, then obtains the water-coal-slurry product of high concentration.
In the water-coal-slurry product of present embodiment preparation, the quality of coal particle accounts for more than 65% of water-coal-slurry gross mass.
Be performances such as the flowability of further improving water-coal-slurry, stability, can add additive at the inlet of kibbling mill, additive is dispersant and stabilizing agent, and the addition of additive accounts for 2% of dry coal quality in the water-coal-slurry.The dispersant that present embodiment adds is lignosulfonates, and the stabilizing agent of adding is an attapulgite clay.

Claims (3)

1. method of utilizing low-order coal to prepare high-concentration coal-water slurry, it may further comprise the steps:
(1) the low order raw coal is carried out super fine crushing, until coal particle size≤3mm;
(2) with the coal grain after the fragmentation and water by 6～8: 4～2 mass ratio mixes;
(3) mixture to step (2) carries out the wet type rough lapping, makes the coal particle size≤1000 μ m in the coal slurry that forms after the rough lapping, and the coal grain less than 75 μ m accounts for more than 50% of dry coal gross mass in the coal slurry;
(4) will adopt following dual mode to handle through the coal oar of wet type rough lapping:
1. 10%～30% of the coal slurry total amount after the wet type rough lapping is mixed by 5: 1～2 mass ratio with water, then this mixture is carried out the wet type fine lapping, make the coal particle size≤30 μ m in the coal slurry after the wet type fine lapping;
The coal oar that 2. will mix with water after the wet type rough lapping of carrying out beyond the wet type fine lapping is directly sent into filter;
(5) will through step (4) 1. the coal oar that carries out after the wet type fine lapping of kind mode adopt following three kinds of modes to handle:
1. the coal oar after the wet type fine lapping is all returned step (3) rough lapping that circulates; Perhaps,
2. the coal oar after a part of wet type fine lapping is returned step (3) rough lapping that circulates, the coal oar after the fine lapping of another part wet type is directly sent into filter; Perhaps,
3. the coal oar after the wet type fine lapping is all directly sent into filter;
(6) coal slurry that will send into filter filters through 18～20 purpose screen packs, carries out successively obtaining the high-concentration coal-water slurry product after high-speed stirred and the stirring at low speed in agitating device again.
2. a kind of method of utilizing low-order coal to prepare high-concentration coal-water slurry as claimed in claim 1 is characterized in that: one or many adds additive in described step (2), and the addition of described additive accounts for 0.2%～2% of dry coal quality in the described water-coal-slurry.
3. a kind of method of utilizing low-order coal to prepare high-concentration coal-water slurry as claimed in claim 2, it is characterized in that: described additive comprises dispersant and stabilizing agent; Described dispersant is selected from one or more of naphthalene sulfonate, lignosulfonates, humic acid and olefines, and described stabilizing agent is selected from one or more of carboxymethyl cellulose, attapulgite clay and inorganic salts.
CN2007101883967A 2007-01-17 2007-11-16 Method for preparing high concentration water-coal-slurry by low-rank coal Active CN101173765B (en)

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