CN111676078A - Coal powder and preparation process thereof - Google Patents
Coal powder and preparation process thereof Download PDFInfo
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- CN111676078A CN111676078A CN202010571806.1A CN202010571806A CN111676078A CN 111676078 A CN111676078 A CN 111676078A CN 202010571806 A CN202010571806 A CN 202010571806A CN 111676078 A CN111676078 A CN 111676078A
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- coal
- coal powder
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- hydrophobic layer
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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
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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
- C10L5/34—Other details of the shaped fuels, e.g. briquettes
- C10L5/36—Shape
- C10L5/363—Pellets or granulates
Abstract
The invention discloses coal powder, the surface of which is provided with a hydrophobic layer made of hydrophobic materials, and the coal powder is characterized in that: the hydrophobic material comprises one or two of organic silicon sodium alkoxide or organic silicon resin. The invention also discloses two preparation processes of the coal powder. The coal powder prepared by the coal powder and the preparation process thereof has the advantages of good hydrophobicity, easy storage and transportation and high combustion heat efficiency.
Description
Technical Field
The invention belongs to the field of pulverized coal, and particularly relates to pulverized coal and a preparation process thereof.
Background
Pulverized coal is an important fuel and is widely used in heat energy supply of thermal power plants and industrial boilers. However, the coal storage capacity of thermal power plants and industrial boilers is limited, so that conventional open-air coal storage yards (stacking yards) are still used for storing coal on a large scale at present.
However, the traditional coal storage yard construction has the disadvantages of large investment, large occupied area, high coal storage cost and large coal storage loss. Furthermore, the coal storage lasts for 60 days, not only the coal storage cost per ton per day is 0.4 yuan, but also the coal storage loss is caused. The storage loss factor was 3% calculated only on 30 days of storage. Wherein the heat productivity is lost by 2 percent, and the lignite is higher by more than 10 percent. Therefore, the longer the coal storage time is, the greater the loss is.
In addition, due to the hydrophilicity of the coal powder, the existing fine coal powder is easy to absorb moisture and cannot be waterproof in the storage and transportation processes (freight car land transportation), so that the storage time of the coal powder capable of keeping the property is shortened, and the coal powder can be stored for only about 1 day generally. Meanwhile, the pulverized coal is easy to volatilize volatile components in the pulverized coal in the storage and transportation processes, and the separation of the volatile components can cause the pulverized coal to be self-ignited. The above disadvantages of pulverized coal make pulverized coal be greatly limited in storage time, transportation mode and application field. Therefore, the effective storage, transportation and utilization of coal have been a technical problem which plagues the related technicians.
At present, the technical problems of storage, transportation and utilization of coal are solved by adopting a ' coal water slurry ' technology (for example, the technical content disclosed by the patent number CN201610925779.7, namely a method for preparing high-concentration coal water slurry by high-concentration coal water slurry and high-efficiency classification particle control) '. The "coal water slurry" technology is a technology that coal briquettes are made into coal powder, the coal powder, water and additives are mixed together to make the "coal water slurry" and the "coal water slurry" is mainly conveyed by a pipeline. However, the "coal water slurry" technology has the following defects:
due to the water absorption and moisture absorption characteristics of the coal powder, when the coal powder is in an aqueous solution, the coal powder can absorb water in the solution (reduce heat energy and heat efficiency during subsequent combustion use), so that the coal powder concentration in the coal water slurry is reduced (lower) in the coal water slurry manufacturing process, the utilization efficiency is reduced, the conveying cost is increased, and the popularization and the use of the coal water slurry are influenced.
Through years of research and development, the applicant team provides a plurality of research and development results about 'effective storage, transportation and utilization of coal', and successively applies patents to the various research and development results, specifically:
application date: 7 month and 11 days 2014; the publication number CN104073319B is named as a technical scheme of a lignite additive and a lignite dehydration treatment method, which can remarkably increase the hydrophobicity and permeability of 'internal water' and 'combined water' of lignite and greatly improve the industrial utilization value of lignite.
Application date: 31/8/2015; the notice number is: CN105062603B, entitled waterproof coal powder and its preparation method, which can convert coal powder from hydrophilic material to hydrophobic material, greatly reduce the hydrophilic property of coal powder, and prevent volatile in coal powder from volatilizing, thereby effectively avoiding the spontaneous combustion of coal powder in storage, prolonging storage time, increasing safety during storage and transportation, and having good application prospect.
Application date: 6 months and 28 days 2018; the notice number is: CN108753388A, entitled "a preparation method of coal water slurry" -the technical scheme is suitable for various coal types, the prepared coal water slurry does not precipitate in the pipeline conveying process, and is not easily affected by low temperature, thereby avoiding the problem of pipeline blockage, and after the coal water slurry is conveyed to the destination, the coal powder is easily separated from the liquid phase carrier, and the separated coal powder is basically in a dry state.
Application date: 15/4/2019; the notice number is: CN109971526A, entitled "an energy storage method and energy utilization method" -the technical scheme has the advantages of easy realization, industrial large-scale energy storage, convenient use and better benefit.
The technical scheme provides a good solution for 'effective storage, transportation and utilization of coal'.
However, how to design a coal powder with good hydrophobicity, easy storage and transportation and high combustion thermal efficiency is still a technical problem to be considered and solved by the technical personnel in the field.
Disclosure of Invention
Aiming at the defects of the prior art, the technical problems to be solved by the invention are as follows: how to provide a coal powder with good hydrophobicity, easy storage and transportation and high combustion thermal efficiency. The technical problem to be further solved is that: how to provide a preparation process capable of reliably preparing the coal dust.
In order to solve the technical problems, the invention adopts the following technical scheme:
the coal powder is characterized in that the surface of the coal powder is provided with a hydrophobic layer, and the hydrophobic layer is made of hydrophobic materials: the hydrophobic material comprises one or two of organic silicon sodium alkoxide or organic silicon resin.
Compared with the prior art, the coal powder has the advantages that:
1. so that the pulverized coal has high-efficiency water resistance (the hydrophobicity is higher than 99.7 percent, no penetration exists for 30 days under the static pressure of 700mm water column)
The main component of the sodium organosiliconate is sodium methylsiliconate, which is easy to generate methylsiliconate under the action of water and carbon dioxide; the silanol group generated by the reaction has active property, and not only can be further reacted to generate a macromolecular compound, namely a reticular organic silicon resin film (with hydrophobicity). On the other hand, the surface of the silicate building material contains a plurality of silanol groups, and the silanol groups can react with the silanol groups of the waterproof agent for dehydration and crosslinking to bond the surface with alkyl groups, so that the structure of the silicate building material is completely the same as that of organic silicon resin, the surface tension can be reduced, the contact angle of water is increased to about 105 ℃, the reverse capillary effect is realized, namely, a so-called hydrophobic layer is formed, and the silicate building material has a high-efficiency waterproof effect.
2. The hydrophobic layer on the surface of the coal powder has hydrophobicity and air permeability
The air permeability and the hydrophobicity are originally contradictory properties, but after the hydrophobic layer on the surface of the coal powder is prepared by additionally containing sodium organosiliconate, the hydrophobic layer can form a porous structure, the aperture of each hole in the porous structure is smaller than 0.4 nanometer (observed by a Scanning Electron Microscope (SEM), the diameter of a water molecule is smaller than 0.4 nanometer), and each hole is easy for oxygen molecules to enter (the diameter of an oxygen molecule is 0.346 nanometer), so that the combustion heat energy and the combustion efficiency of the coal powder with the hydrophobic layer can be improved by about 5-10% (compared with the waterproof coal powder in the technical scheme of the publication No. CN 105062603B).
The specific mechanism is as follows: the organosilicon has physical or chemical adsorption on the surface of the coal dust particles, and is combined with the self reaction and crosslinking of the organosilicon, so that a net-shaped wrapped hydrophobic layer (as shown in figure 1, the number 1 is coal powder particles, the number 2 is a hydrophobic layer structure) is formed on the surface of the coal dust particles, the hydrophobic layer is a polysiloxane network (a porous material, the pore diameter can be regulated and controlled according to the size of the needed adsorbed molecules, and the hydrophilic and hydrophobic properties in the pore diameter can also be regulated by changing the structure of the organosiloxane).)
3. Further improve the hydrophobicity
The hydrophobic layer made of the material comprising the organic silicon sodium alkoxide or the organic silicon resin not only has the characteristics of hydrophobicity and air permeability, but also can increase the roughness of the surface of the pulverized coal particles, and the roughness can further increase the wetting angle of the hydrophobic layer, so that the hydrophobicity is further improved.
A preparation process of coal powder is characterized by comprising the following steps: mixing coal powder, water and hydrophobic material to form slurry, and removing water.
The preparation process is simple, convenient to operate and easy to implement, and the hydrophobic coal powder can be reliably prepared.
When the hydrophobic material does not contain calcium carbonate, the carbon dioxide can directly come from air. During preparation, air is aerated in a tank containing the mixture through an aerator. Therefore, the organic silicon sodium alkoxide can be reacted by utilizing the carbon dioxide in the air, a more sufficient stirring and mixing effect can be formed by utilizing aeration, the hydrophobic layer on the surface of the pulverized coal is more uniform, and the processing reliability of the hydrophobic layer is ensured.
The other preparation process of the coal powder is characterized in that: stirring and mixing the coal powder and the hydrophobic material at the temperature of 100-150 ℃ for a preset time, and cooling to normal temperature.
The preparation process does not need water, can better meet the requirement of water shortage and is also used by users in coal-rich areas. And a hydrophobic layer can be formed on the surface of the coal particles.
Drawings
Fig. 1 is a schematic structural view of pulverized coal produced by the pulverized coal production process of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
TABLE 1 coal dust Properties for various examples
Therefore, the coal powder has the advantages that:
1. so that the pulverized coal has high-efficiency water resistance (the hydrophobicity is higher than 99.7 percent, no penetration exists for 30 days under the static pressure of 700mm water column)
The main component of the sodium organosiliconate is sodium methylsiliconate, which is easy to generate methylsiliconate under the action of water and carbon dioxide; the silanol group generated by the reaction has active property, and not only can be further reacted to generate a macromolecular compound, namely a reticular organic silicon resin film (with hydrophobicity). On the other hand, the surface of the silicate building material contains a plurality of silanol groups, and the silanol groups can react with the silanol groups of the waterproof agent for dehydration and crosslinking to bond the surface with alkyl groups, so that the structure of the silicate building material is completely the same as that of organic silicon resin, the surface tension can be reduced, the contact angle of water is increased to about 105 ℃, the reverse capillary effect is realized, namely, a so-called hydrophobic layer is formed, and the silicate building material has a high-efficiency waterproof effect.
2. The hydrophobic layer on the surface of the coal powder has hydrophobicity and air permeability
The air permeability and the hydrophobicity are originally contradictory properties, but after the hydrophobic layer on the surface of the coal powder is prepared by additionally containing sodium organosiliconate, the hydrophobic layer can form a porous structure, the aperture of each hole in the porous structure is smaller than 0.4 nanometer (observed by a Scanning Electron Microscope (SEM), the diameter of a water molecule is smaller than 0.4 nanometer), and each hole is easy for oxygen molecules to enter (the diameter of an oxygen molecule is 0.346 nanometer), so that the combustion heat energy and the combustion efficiency of the coal powder with the hydrophobic layer can be improved by about 5-10% (compared with the waterproof coal powder in the technical scheme of the publication No. CN 105062603B).
The specific mechanism is as follows: the organosilicon has physical or chemical adsorption on the surface of the coal dust particles, and is combined with the self reaction and crosslinking of the organosilicon, so that a net-shaped wrapped hydrophobic layer (as shown in figure 1, the number 1 is coal powder particles, the number 2 is a hydrophobic layer structure) is formed on the surface of the coal dust particles, the hydrophobic layer is a polysiloxane network (a porous material, the pore diameter can be regulated and controlled according to the size of the needed adsorbed molecules, and the hydrophilic and hydrophobic properties in the pore diameter can also be regulated by changing the structure of the organosiloxane).)
3. Further improve the hydrophobicity
The hydrophobic layer made of the material comprising the organic silicon sodium alkoxide or the organic silicon resin not only has the characteristics of hydrophobicity and air permeability, but also can increase the roughness of the surface of the pulverized coal particles, and the roughness can further increase the wetting angle of the hydrophobic layer, so that the hydrophobicity is further improved.
In the implementation, whether the hydrophobic layer of the coal dust is air-permeable or not can be observed through a Scanning Electron Microscope (SEM), and when the hydrophobic layer is seen to be in a net-shaped porous structure under the microscope, the hydrophobic layer is considered to be air-permeable.
The first example of the coal dust preparation process:
the preparation process of coal powder is characterized by that the coal powder, water and hydrophobic material are stirred and mixed into slurry material, and then the dry water content is removed.
The preparation process is simple, convenient to operate and easy to implement, and the hydrophobic coal powder can be reliably prepared.
When the hydrophobic material does not contain calcium carbonate, the carbon dioxide can directly come from air. During preparation, air is aerated in a tank containing the mixture through an aerator. Therefore, the organic silicon sodium alkoxide can be reacted by utilizing the carbon dioxide in the air, a more sufficient stirring and mixing effect can be formed by utilizing aeration, the hydrophobic layer on the surface of the pulverized coal is more uniform, and the processing reliability of the hydrophobic layer is ensured.
Wherein, the procedure of removing water adopts drying or airing treatment.
When the method is implemented, the drying treatment is carried out by adopting a drying and heating roller.
The drying treatment has the advantages of good controllability, strong treatment capacity and high drying efficiency (one end is used for feeding and the other end is used for discharging, and continuous processing is realized).
A second example of a coal fines production process:
the preparation process of coal powder includes mixing coal powder and hydrophobic material at 100-150 deg.c for certain time and cooling to normal temperature.
The preparation process does not need water, can better meet the requirement of water shortage and is also used by users in coal-rich areas. And a hydrophobic layer can be formed on the surface of the coal particles.
In practice, the roller is preferably heated to prepare the composition.
Wherein the rotating speed of the stirring piece in the stirring and mixing process is more than 20 revolutions per minute.
In practice, the stirring member may be a stirring blade in the drum or the tank.
The stirring piece with the speed can ensure that the hydrophobic material is fully adhered to the surface of the coal particles.
Wherein the time for stirring and mixing is 4 to 20 minutes.
The formation of the hydrophobic layer on the surface of the coal particles can be effectively ensured by the time.
The above is only a preferred embodiment of the present invention, and it should be noted that several modifications and improvements made by those skilled in the art without departing from the technical solution should also be considered as falling within the scope of the claims.
Claims (8)
1. The coal powder is characterized in that the surface of the coal powder is provided with a hydrophobic layer, and the hydrophobic layer is made of hydrophobic materials: the hydrophobic material comprises one or two of organic silicon sodium alkoxide or organic silicon resin.
2. The coal fines according to claim 1, characterized in that: any unit weight of coal dust: the weight ratio of the hydrophobic material to the coal is (2-30): 100.
3. the coal fines according to claim 1, characterized in that: the hydrophobic material also comprises calcium carbonate; any unit weight of coal dust: the weight ratio of the calcium carbonate to the hydrophobic material to the coal is (4-20): (2-30): 100.
4. a process for the production of coal fines as claimed in any one of claims 1 to 3, characterized in that: mixing coal powder, water and hydrophobic material to form slurry, and removing water.
5. The process for preparing pulverized coal according to claim 4, wherein: the procedure of removing water adopts drying or airing treatment.
6. A process for the production of coal fines as claimed in any one of claims 1 to 3, characterized in that: stirring and mixing the coal powder and the hydrophobic material at the temperature of 100-150 ℃ for a preset time, and cooling to normal temperature.
7. The process for preparing pulverized coal according to claim 5, wherein: the rotating speed of the stirring piece in the stirring and mixing process is more than 20 revolutions per minute.
8. The process for preparing pulverized coal according to claim 6, wherein: the time for the stirring and mixing is 4 to 20 minutes.
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| CN202010571806.1A CN111676078A (en) | 2020-06-22 | 2020-06-22 | Coal powder and preparation process thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114456866A (en) * | 2022-01-17 | 2022-05-10 | 重庆四季金标科技有限公司 | Lignite modification dehydration method and production process thereof and application of modified dehydrated lignite |
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| EP0903389B1 (en) * | 1996-05-31 | 2009-09-16 | Toto Ltd. | Antifouling member and antifouling coating composition |
| CN104003668A (en) * | 2014-06-13 | 2014-08-27 | 田树 | Hydrophobic fiber-reinforced calcium silicate board and manufacturing method thereof |
| CN107699191A (en) * | 2017-10-25 | 2018-02-16 | 浙江星丰科技有限公司 | A kind of waterproof heat-resisting adhesive and preparation method thereof |
| CN108753388A (en) * | 2018-06-28 | 2018-11-06 | 郑翔书 | A kind of preparation method of water-coal-slurry |
-
2020
- 2020-06-22 CN CN202010571806.1A patent/CN111676078A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0903389B1 (en) * | 1996-05-31 | 2009-09-16 | Toto Ltd. | Antifouling member and antifouling coating composition |
| CN104003668A (en) * | 2014-06-13 | 2014-08-27 | 田树 | Hydrophobic fiber-reinforced calcium silicate board and manufacturing method thereof |
| CN107699191A (en) * | 2017-10-25 | 2018-02-16 | 浙江星丰科技有限公司 | A kind of waterproof heat-resisting adhesive and preparation method thereof |
| CN108753388A (en) * | 2018-06-28 | 2018-11-06 | 郑翔书 | A kind of preparation method of water-coal-slurry |
Non-Patent Citations (1)
| Title |
|---|
| 宋功业等: "《建筑防水材料与施工》", 30 September 2007, 中国建材工业出版社 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114456866A (en) * | 2022-01-17 | 2022-05-10 | 重庆四季金标科技有限公司 | Lignite modification dehydration method and production process thereof and application of modified dehydrated lignite |
| WO2023134612A1 (en) * | 2022-01-17 | 2023-07-20 | 重庆四季金标科技有限公司 | Lignite modification and dehydration method, production process thereof, and application of modified dehydrated lignite |
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