CN112646627A - Granular briquette and preparation method thereof - Google Patents
Granular briquette and preparation method thereof Download PDFInfo
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- CN112646627A CN112646627A CN202011517561.0A CN202011517561A CN112646627A CN 112646627 A CN112646627 A CN 112646627A CN 202011517561 A CN202011517561 A CN 202011517561A CN 112646627 A CN112646627 A CN 112646627A
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- anthracite
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- 239000004484 Briquette Substances 0.000 title claims abstract description 47
- 238000002360 preparation method Methods 0.000 title claims abstract description 27
- 239000003245 coal Substances 0.000 claims abstract description 239
- 239000000843 powder Substances 0.000 claims abstract description 193
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 133
- RHZUVFJBSILHOK-UHFFFAOYSA-N anthracen-1-ylmethanolate Chemical compound C1=CC=C2C=C3C(C[O-])=CC=CC3=CC2=C1 RHZUVFJBSILHOK-UHFFFAOYSA-N 0.000 claims abstract description 111
- 239000003830 anthracite Substances 0.000 claims abstract description 111
- 239000011230 binding agent Substances 0.000 claims abstract description 81
- 238000003756 stirring Methods 0.000 claims abstract description 58
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 55
- 239000011593 sulfur Substances 0.000 claims abstract description 55
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 55
- 238000001035 drying Methods 0.000 claims abstract description 44
- 239000007864 aqueous solution Substances 0.000 claims abstract description 36
- 239000011268 mixed slurry Substances 0.000 claims abstract description 29
- 238000004519 manufacturing process Methods 0.000 claims abstract description 23
- 238000002309 gasification Methods 0.000 claims abstract description 21
- 239000002245 particle Substances 0.000 claims abstract description 19
- 239000002002 slurry Substances 0.000 claims abstract description 15
- 238000005303 weighing Methods 0.000 claims abstract description 14
- 238000003825 pressing Methods 0.000 claims description 39
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 27
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 claims description 27
- 239000011591 potassium Substances 0.000 claims description 27
- 229910052700 potassium Inorganic materials 0.000 claims description 27
- 239000011734 sodium Substances 0.000 claims description 27
- 229910052708 sodium Inorganic materials 0.000 claims description 27
- 238000000034 method Methods 0.000 claims description 14
- 238000000227 grinding Methods 0.000 claims description 13
- 239000003250 coal slurry Substances 0.000 claims description 7
- 238000000465 moulding Methods 0.000 claims description 7
- 230000008901 benefit Effects 0.000 abstract description 9
- 239000002994 raw material Substances 0.000 abstract description 9
- 239000002910 solid waste Substances 0.000 abstract description 5
- 239000002699 waste material Substances 0.000 abstract description 5
- 230000007613 environmental effect Effects 0.000 abstract description 4
- 239000002956 ash Substances 0.000 abstract 1
- 230000001502 supplementing effect Effects 0.000 abstract 1
- -1 moisture Substances 0.000 description 22
- 230000000052 comparative effect Effects 0.000 description 21
- 238000002156 mixing Methods 0.000 description 7
- 239000000853 adhesive Substances 0.000 description 4
- 230000001070 adhesive effect Effects 0.000 description 4
- 239000002802 bituminous coal Substances 0.000 description 3
- 239000000571 coke Substances 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000002817 coal dust Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000003570 air Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000000748 compression moulding Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
Classifications
-
- 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
- C10L5/10—Methods of shaping, e.g. pelletizing or briquetting with the aid of binders, e.g. pretreated binders
- C10L5/14—Methods of shaping, e.g. pelletizing or briquetting with the aid of binders, e.g. pretreated binders with organic 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
- C10L5/00—Solid fuels
- C10L5/02—Solid fuels such as briquettes consisting mainly of carbonaceous materials of mineral or non-mineral origin
- C10L5/26—After-treatment of the shaped fuels, e.g. briquettes
- C10L5/28—Heating the shaped fuels, e.g. briquettes; Coking the 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
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Chemistry (AREA)
- Solid Fuels And Fuel-Associated Substances (AREA)
Abstract
The invention discloses a particle type coal and a preparation method thereof, wherein the preparation method comprises the following steps: the granular briquette is made of coal mud powder, anthracite powder, binder and water; the preparation method comprises the following specific steps: weighing coal mud powder, anthracite powder, a binder and water, and dissolving the binder to prepare an aqueous solution; feeding the coal slime powder and the anthracite powder into a stirring device, adding a binder aqueous solution for primary stirring, and supplementing the rest water for secondary stirring until the slurry is uniform; and carrying out secondary drying after the mixed slurry is pressed and molded to obtain the granular coal. The invention adopts the coal slime produced by the coal gasification production device as the main raw material to prepare the granular coal, not only can solve a series of environmental protection problems caused by stacking the coal slime, but also can save land resources, realize the resource utilization of solid wastes, change wastes into valuables and bring considerable economic benefits for enterprises. In addition, the granular coal of the present invention has the advantages of high strength, high heat value, low total sulfur, water, ash and volatile components, etc.
Description
Technical Field
The invention relates to the fields of clean coal production technology and solid waste resource utilization, in particular to a granular coal and a preparation method thereof.
Background
Coal gasification units produce large quantities of coal slurry during production. The coal slime is a paste mixture with high water content (about 50%), fine coal slime particles (more than 90% of the particles have the particle size of less than 0.5mm), most of unburned carbon and certain viscosity, and is difficult to transport remotely. At present, an effective treatment mode for huge amount of coal slime is not available, and many enterprises simply stack the coal slime, so that not only is a large amount of land resources wasted, but also local soil, water and air environments are seriously harmed. Therefore, the method has important practical significance for resource utilization of the coal slime.
The briquette is made of coal product with certain shape and strength and is made up by using one or several kinds of coal powder and a certain proportion of adhesive or sulfur-fixing agent through a certain pressure treatment. Compared with natural coal, the briquette has the characteristics of uniform particles, large porosity, high combustion efficiency, small environmental pollution and the like. The data show that the combustion efficiency of the coal can be increased by 15 percent when the briquette is combusted, the coal consumption is saved by about 20 percent, the dust can be reduced by more than 80 percent, and the SO in the waste gas is reduced2And NOXThe reduction is more than 50 percent. The coal slime contains a large amount of unburned carbon, has the characteristics of high ash, low volatile component, low sulfur, heat production by combustion and the like, and can be used as a raw material source for preparing the molded coal. At present, raw material coal used for producing molded coal in the industry is mainly one or a combination of bituminous coal, anthracite and semi-coke, and compared with coal slime, the cost is higher.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a granular briquette and a preparation method thereof. The granular coal briquette takes the coal slime produced by a coal gasification production device as a main raw material, can effectively solve a series of environmental protection problems and land resource waste problems caused by stacking of the coal slime, realizes the resource utilization of solid wastes, changes waste into valuables, and brings considerable economic benefits for enterprises. In addition, compared with the briquette which takes one or the combination of bituminous coal, anthracite and semi-coke as the main raw material in the industry, the granular briquette has greater cost advantage. The granular coal briquette prepared by the preparation method provided by the invention has the advantages of high strength, high heat value, low total sulfur, moisture, ash content and volatile components and the like, and each performance index is far higher than the standard requirement.
The purpose of the invention can be realized by the following technical scheme.
The granular briquette of the present invention is made of coal mud powder, anthracite powder, adhesive and water.
The coal mud powder, the anthracite powder, the binder and the water account for the following mass percent: 67-73 wt% of coal mud powder, 18-22 wt% of anthracite powder, 2-4 wt% of binder and 7-11 wt% of water; the sum of the mass percentages of the coal mud powder, the anthracite powder, the binder and the water is 100 wt%.
The coal slime powder is obtained by drying coal slime produced by a coal gasification production device; the coal slime powder comprises 4-6% of total water, 0.3-0.4% of total sulfur, 3-7% of volatile components, 25-28% of ash and 5200-5400 kcal/kg of calorific value.
The anthracite powder has less than 6 percent of total water, less than 0.5 percent of total sulfur, less than 10 percent of volatile matter, less than 12 percent of ash content and more than 6500kcal/kg of heat productivity.
The binder is one or two of sodium humate and potassium humate.
The granular briquette has less than 4% of total water, less than 0.5% of total sulfur, less than 8% of volatile components, less than 20% of ash, more than 5900kcal/kg of heat productivity, more than 650N/cold pressing strength and more than 88% of falling strength.
The purpose of the invention can be realized by the following technical scheme.
The preparation method of the granular coal briquette comprises the following steps:
(1) drying coal slime produced by a coal gasification production device to obtain coal slime powder, and crushing and grinding anthracite into anthracite powder;
(2) weighing coal mud powder, anthracite powder, a binder and water according to a certain mass percentage, and dissolving a part of weighed water into the binder to prepare a binder aqueous solution;
(3) feeding the weighed coal mud powder and anthracite powder into a stirring device, adding the prepared binder aqueous solution for primary stirring, and then adding the rest part of water for secondary stirring until the slurry is uniform;
(4) and pressing and molding the mixed slurry, and then carrying out secondary drying to obtain the granular coal.
The pulverized and ground anthracite powder in the step (1) has the particle size less than or equal to 3 mm.
In the step (2), the coal mud powder, the anthracite powder, the binder and the water are weighed according to the following mass percentages: 67-73 wt% of coal mud powder, 18-22 wt% of anthracite powder, 2-4 wt% of binder and 7-11 wt% of water; the sum of the mass percentages of the coal mud powder, the anthracite powder, the binder and the water is 100 wt%;
in the step (2), the binder is one or two of sodium humate and potassium humate, and the mass fraction of the binder contained in the prepared binder aqueous solution is 25-35 wt%.
The mixed slurry in the step (4) is pressed and formed under the pressure of 10 MPa-14 MPa; and (4) after the mixed slurry is pressed and formed, the first drying temperature is 70-90 ℃, the drying time is 2-3 h, the second drying temperature is 100-110 ℃, and the drying time is 1-2 h.
Compared with the prior art, the technical scheme of the invention has the following beneficial effects:
the granular coal briquette provided by the invention takes the coal slime produced by a coal gasification production device as a main raw material, can effectively solve a series of environmental protection problems and land resource waste problems caused by stacking of the coal slime, realizes the resource utilization of solid wastes, changes wastes into valuables, reduces the environmental protection pressure of enterprises, and can bring considerable economic benefits for the enterprises. The coal slurry belongs to solid waste generated in the production process of a coal gasification device, is low in price and can be used even freely, although anthracite powder is added into the granular coal raw material provided by the invention, the addition amount is small, the coal slurry mainly aims to improve the heat productivity of the final coal product and reduce the ash content of the final coal product, and has a larger cost advantage compared with the coal which takes one or the combination of bituminous coal, anthracite and semi-coke as the main raw material in the industry.
The granular briquette provided by the invention has the advantages of high strength, high heat value, low total sulfur, moisture, ash content and volatile components, and the like, wherein the total water content is less than 4%, the total sulfur content is less than 0.5%, the volatile components are less than 8%, the ash content is less than 20%, the heat productivity is more than 5900kcal/kg, the cold pressing strength is more than 650N/briquette, the falling strength is more than 88%, and each performance index is far higher than the standard requirement.
In the preparation method of the granular coal briquette, the binder is added into the coal dust in a water solution mode, the water is added twice, one part of the binder is used as a solvent for preparing the binder solution and is added into the coal dust along with the binder, and the other part of the binder is added after one-time stirring. Compared with the traditional preparation method of simultaneously adding coal powder, solid binder and water into a stirring device for mixing and stirring at one time, the preparation method provided by the invention can promote the contact between the binder and the coal powder, enhance the adhesive force between the coal powders, further reduce the molding pressure, save the energy consumption and obviously improve the strength of the prepared granular coal; on the other hand, the water consumption can be reduced, so that the difficulty in demoulding caused by large water quantity is avoided, and the binder loss caused by slurry overflow in pressing is reduced.
The preparation method of the granular coal briquette provided by the invention adopts a two-step drying mode, and can effectively avoid the problems of crack generation, strength reduction and the like in the coal briquette caused by rapid evaporation of water in a high-temperature one-step drying method.
Detailed Description
The process provided by the present invention is described in detail below with reference to examples, but the present invention is not limited thereto in any way.
The granular briquette of the present invention is made of coal mud powder, anthracite powder, adhesive and water. The mass percentage of each raw material is as follows: 67-73 wt% of coal mud powder, 18-22 wt% of anthracite powder, 2-4 wt% of binder and 7-11 wt% of water; the sum of the mass percentages of the coal mud powder, the anthracite powder, the binder and the water is 100 wt%.
The coal slurry powder is obtained by drying coal slurry generated by a coal gasification production device. The coal slime powder comprises 4-6% of total water, 0.3-0.4% of total sulfur, 3-7% of volatile components, 25-28% of ash and 5200-5400 kcal/kg of calorific value.
Wherein, the anthracite powder has less than 6 percent of total water, less than 0.5 percent of total sulfur, less than 10 percent of volatile components, less than 12 percent of ash content and more than 6500kcal/kg of heat productivity.
Wherein the binder is one or two of sodium humate and potassium humate.
The reference value of each performance index of the granular coal briquette of the invention refers to DB13/2122-2014 clean granular coal briquette. The total water content of the granular briquette is less than 4%, the total sulfur content is less than 0.5%, the volatile component is less than 8%, the ash content is less than 20%, the heat productivity is more than 5900kcal/kg, the cold pressing strength is more than 650N/briquette, and the falling strength is more than 88%.
The preparation method of the granular coal briquette comprises the following steps:
(1) drying coal slime produced by a coal gasification production device to obtain coal slime powder, and crushing and grinding anthracite into anthracite powder; wherein the particle size of the pulverized and ground anthracite powder is less than or equal to 3 mm;
(2) weighing coal mud powder, anthracite powder, a binder and water according to a certain mass percentage, and dissolving a part of weighed water into the binder to prepare a binder aqueous solution;
wherein the coal slime powder, the anthracite powder, the binder and the water are weighed according to the following mass percentages: 67-73 wt% of coal mud powder, 18-22 wt% of anthracite powder, 2-4 wt% of binder and 7-11 wt% of water; the sum of the mass percentages of the coal mud powder, the anthracite powder, the binder and the water is 100 wt%;
wherein, the binder is one or two of sodium humate and potassium humate, and the mass fraction of the binder contained in the prepared binder aqueous solution is 25-35 wt%;
(3) feeding the weighed coal mud powder and anthracite powder into a stirring device, adding the prepared binder aqueous solution for primary stirring, and then adding the rest part of water for secondary stirring until the slurry is uniform;
(4) and pressing and molding the mixed slurry, and then carrying out secondary drying to obtain the granular coal.
Wherein the mixed slurry is pressed and formed under the pressure of 10-14 MPa. After the mixed slurry is pressed and formed, the first drying temperature is 70-90 ℃, the drying time is 2-3 h, the second drying temperature is 100-110 ℃, and the drying time is 1-2 h.
Example 1
A granular briquette is prepared from coal mud powder 67 wt%, anthracite powder 22 wt%, sodium humate 2 wt% and water 9 wt%. Wherein the coal slime powder contains 4% of total water, 0.4% of total sulfur, 7% of volatile components, 25% of ash and 5300kcal/kg of heat productivity; the anthracite powder contains 5.8% of total water, 0.49% of total sulfur, 8.5% of volatile matter, 11.4% of ash and 7043kcal/kg of heat productivity.
A preparation method of granular coal comprises the following steps:
(1) drying coal slime produced by a coal gasification production device to obtain coal slime powder, and crushing and grinding anthracite into anthracite powder with the particle size of 1 mm;
(2) weighing 67 wt% of coal mud powder, 22 wt% of anthracite powder, 2 wt% of sodium humate and 9 wt% of water, and preparing the weighed sodium humate into a 25 wt% aqueous solution;
(3) feeding the weighed coal mud powder and anthracite powder into a stirring device, adding the prepared binder aqueous solution for primary stirring, and then adding the rest part of water for secondary stirring until the slurry is uniform;
(4) and pressing the mixed slurry into a shape under 14MPa, and then drying at 90 ℃ for 2h and at 110 ℃ for 1h to obtain the granular coal.
The produced granulated coal was subjected to full water, full sulfur, volatile matter, ash content, calorific value, cold pressing strength and falling strength tests, and the results are shown in table 1.
Example 2
A granular briquette is prepared from coal mud powder (73 wt.%), anthracite powder (18), sodium humate (2) and water (7). Wherein the coal slime powder contains 5% of total water, 0.3% of total sulfur, 3% of volatile components, 28% of ash and 5400kcal/kg of heat productivity; the anthracite powder comprises 5.5% of total water, 0.4% of total sulfur, 9.1% of volatile components, 11.8% of ash and 6580kcal/kg of heat productivity.
A preparation method of granular coal comprises the following steps:
(1) drying coal slime produced by a coal gasification production device to obtain coal slime powder, and crushing and grinding anthracite into anthracite powder with the particle size of 2 mm;
(2) weighing 73 wt% of coal mud powder, 18 wt% of anthracite powder, 2 wt% of sodium humate and 7 wt% of water, and preparing the weighed sodium humate into 35 wt% of aqueous solution;
(3) feeding the weighed coal slime powder and anthracite powder into a stirring device, adding the prepared binder aqueous solution for primary stirring, and then adding the rest water for secondary stirring until the slurry is uniform;
(4) and pressing the mixed slurry into a shape under 12MPa, and then drying at 80 ℃ for 2.5h and at 105 ℃ for 1.5h to obtain the granular coal.
The produced granulated coal was subjected to full water, full sulfur, volatile matter, ash content, calorific value, cold pressing strength and falling strength tests, and the results are shown in table 1.
Example 3
A granular briquette is prepared from coal mud powder 67 wt%, anthracite powder 20 wt%, sodium humate 2 wt% and water 11 wt%. Wherein the coal slime powder contains 6% of total water, 0.3% of total sulfur, 5% of volatile components, 26.5% of ash and 5200kcal/kg of calorific value; the anthracite powder contains 5.3% of total water, 0.48% of total sulfur, 7.5% of volatile components, 11.2% of ash and 6917kcal/kg of heat productivity.
A preparation method of granular coal comprises the following steps:
(1) drying coal slime produced by a coal gasification production device to obtain coal slime powder, and crushing and grinding anthracite into anthracite powder with the particle size of 3 mm;
(2) weighing 67 wt% of coal slime powder, 20 wt% of anthracite powder, 2 wt% of sodium humate and 11 wt% of water, and preparing the weighed sodium humate into 25 wt% of aqueous solution;
(3) feeding the weighed coal slime powder and anthracite powder into a stirring device, adding the prepared binder aqueous solution for primary stirring, and then adding the rest water for secondary stirring until the slurry is uniform;
(4) and pressing and molding the mixed slurry under 10MPa, and then drying at 70 ℃ for 3h and at 100 ℃ for 2h to obtain the granular coal.
The produced granulated coal was subjected to full water, full sulfur, volatile matter, ash content, calorific value, cold pressing strength and falling strength tests, and the results are shown in table 1.
Example 4
A granular briquette is prepared from coal mud powder 67 wt%, anthracite powder 18 wt%, potassium humate 4 wt% and water 11 wt%. Wherein the coal slime powder contains 6% of total water, 0.35% of total sulfur, 5% of volatile components, 25% of ash and 5300kcal/kg of heat productivity; the anthracite powder comprises 5.2% of total water, 0.44% of total sulfur, 7.2% of volatile components, 10.9% of ash and 6774kcal/kg of heat productivity.
A preparation method of granular coal comprises the following steps:
(1) drying coal slime produced by a coal gasification production device to obtain coal slime powder, and crushing and grinding anthracite into anthracite powder with the particle size of 3 mm;
(2) weighing 67 wt% of coal mud powder, 18 wt% of anthracite powder, 4 wt% of potassium humate and 11 wt% of water, and preparing the weighed potassium humate into a 30 wt% aqueous solution;
(3) feeding the weighed coal slime powder and anthracite powder into a stirring device, adding the prepared binder aqueous solution for primary stirring, and then adding the rest water for secondary stirring until the slurry is uniform;
(4) and pressing the mixed slurry into a shape under 12MPa, and then drying at 80 ℃ for 2.5h and at 110 ℃ for 1h to obtain the granular coal.
The produced granulated coal was subjected to full water, full sulfur, volatile matter, ash content, calorific value, cold pressing strength and falling strength tests, and the results are shown in table 1.
Example 5
A granular briquette is prepared from coal mud powder (70 wt.%), anthracite powder (18), potassium humate (3) and water (9). Wherein the coal slime powder contains 5% of total water, 0.3% of total sulfur, 7% of volatile components, 26.5% of ash and 5200kcal/kg of calorific value; the anthracite powder comprises 5.7% of total water, 0.41% of total sulfur, 6.3% of volatile matters, 11% of ash and 6885kcal/kg of heat productivity.
A preparation method of granular coal comprises the following steps:
(1) drying coal slime produced by a coal gasification production device to obtain coal slime powder, and crushing and grinding anthracite into anthracite powder with the particle size of 2 mm;
(2) weighing 70 wt% of coal mud powder, 18 wt% of anthracite powder, 3 wt% of potassium humate and 9 wt% of water, and preparing the weighed potassium humate into 30 wt% of aqueous solution;
(3) feeding the weighed coal slime powder and anthracite powder into a stirring device, adding the prepared binder aqueous solution for primary stirring, and then adding the rest water for secondary stirring until the slurry is uniform;
(4) and pressing the mixed slurry into a shape under 14MPa, and then drying at 90 ℃ for 2h and at 100 ℃ for 2h to obtain the granular coal.
The produced granulated coal was subjected to full water, full sulfur, volatile matter, ash content, calorific value, cold pressing strength and falling strength tests, and the results are shown in table 1.
Example 6
A granular briquette is prepared from coal mud powder (70 wt.%), anthracite powder (20), potassium humate (3) and water (7). Wherein the coal slime powder contains 4% of total water, 0.4% of total sulfur, 3% of volatile components, 28% of ash and 5400kcal/kg of heat productivity; the anthracite powder contains 5% of total water, 0.32% of total sulfur, 9.3% of volatile matters, 10.4% of ash and 7098kcal/kg of heat productivity.
A preparation method of granular coal comprises the following steps:
(1) drying coal slime produced by a coal gasification production device to obtain coal slime powder, and crushing and grinding anthracite into anthracite powder with the particle size of 1 mm;
(2) weighing 70 wt% of coal mud powder, 20 wt% of anthracite powder, 3 wt% of potassium humate and 7 wt% of water, and preparing the weighed potassium humate into 35 wt% of water solution;
(3) feeding the weighed coal slime powder and anthracite powder into a stirring device, adding the prepared binder aqueous solution for primary stirring, and then adding the rest water for secondary stirring until the slurry is uniform;
(4) and pressing and molding the mixed slurry under 10MPa, and then drying at 70 ℃ for 3h and 105 ℃ for 1.5h to obtain the granular coal.
The produced granulated coal was subjected to full water, full sulfur, volatile matter, ash content, calorific value, cold pressing strength and falling strength tests, and the results are shown in table 1.
Example 7
A granular briquette is prepared from coal mud powder 73 wt%, anthracite powder 18 wt%, sodium humate 1 wt%, potassium humate 1 wt% and water 7 wt%. Wherein the coal slime powder contains 4% of total water, 0.3% of total sulfur, 5% of volatile components, 28% of ash and 5200kcal/kg of calorific value; the anthracite powder comprises 4.9% of total water, 0.36% of total sulfur, 8.8% of volatile matters, 11.1% of ash and 7150kcal/kg of heat productivity.
A preparation method of granular coal comprises the following steps:
(1) drying coal slime produced by a coal gasification production device to obtain coal slime powder, and crushing and grinding anthracite into anthracite powder with the particle size of 3 mm;
(2) weighing 73 wt% of coal slime powder, 18 wt% of anthracite powder, 1 wt% of sodium humate, 1 wt% of potassium humate and 7 wt% of water, dissolving the weighed sodium humate and potassium humate in the water together, and preparing into an aqueous solution with the total mass fraction of 30 wt% of a binder;
(3) feeding the weighed coal slime powder and anthracite powder into a stirring device, adding the prepared binder aqueous solution for primary stirring, and then adding the rest water for secondary stirring until the slurry is uniform;
(4) and pressing the mixed slurry into a shape under 10MPa, and then drying at 90 ℃ for 2h and at 100 ℃ for 2h to obtain the granular coal.
The produced granulated coal was subjected to full water, full sulfur, volatile matter, ash content, calorific value, cold pressing strength and falling strength tests, and the results are shown in table 1.
Example 8
A granular briquette is prepared from coal mud powder (70 wt%), anthracite powder (20), sodium humate (2), potassium humate (1) and water (7). Wherein the coal slime powder contains 5% of total water, 0.35% of total sulfur, 3% of volatile components, 26.5% of ash and 5300kcal/kg of heat productivity; the anthracite powder comprises 4.6% of total water, 0.3% of total sulfur, 8.8% of volatile components, 11.1% of ash and 7223kcal/kg of heat productivity.
A preparation method of granular coal comprises the following steps:
(1) drying coal slime produced by a coal gasification production device to obtain coal slime powder, and crushing and grinding anthracite into anthracite powder with the particle size of 2 mm;
(2) weighing 70 wt% of coal slime powder, 20 wt% of anthracite powder, 2 wt% of sodium humate, 1 wt% of potassium humate and 7 wt% of water, dissolving the weighed sodium humate and potassium humate in the water together, and preparing into an aqueous solution with the total mass fraction of the binder being 35 wt%;
(3) feeding the weighed coal slime powder and anthracite powder into a stirring device, adding the prepared binder aqueous solution for primary stirring, and then adding the rest water for secondary stirring until the slurry is uniform;
(4) and pressing and molding the mixed slurry at 14MPa, and then drying at 70 ℃ for 3h and at 110 ℃ for 1h to obtain the granular coal.
The produced granulated coal was subjected to full water, full sulfur, volatile matter, ash content, calorific value, cold pressing strength and falling strength tests, and the results are shown in table 1.
Example 9
A granular briquette is prepared from coal mud powder 67 wt%, anthracite powder 22 wt%, sodium humate 1 wt%, potassium humate 1 wt% and water 9 wt%. Wherein the coal slime powder contains 6% of total water, 0.4% of total sulfur, 7% of volatile components, 25% of ash and 5400kcal/kg of heat productivity; the anthracite powder comprises 5.1% of total water, 0.47% of total sulfur, 7.4% of volatile components, 9.6% of ash and 6800kcal/kg of heat productivity.
A preparation method of granular coal comprises the following steps:
(1) drying coal slime produced by a coal gasification production device to obtain coal slime powder, and crushing and grinding anthracite into anthracite powder with the particle size of 1 mm;
(2) weighing 67 wt% of coal slime powder, 22 wt% of anthracite powder, 1 wt% of sodium humate, 1 wt% of potassium humate and 9 wt% of water, dissolving the weighed sodium humate and potassium humate in the water together, and preparing into an aqueous solution with the total mass fraction of 25 wt% of a binder;
(3) feeding the weighed coal slime powder and anthracite powder into a stirring device, adding the prepared binder aqueous solution for primary stirring, and then adding the rest water for secondary stirring until the slurry is uniform;
(4) and pressing the mixed slurry into a shape under 12MPa, and then drying at 80 ℃ for 2.5h and at 105 ℃ for 1.5h to obtain the granular coal.
The produced granulated coal was subjected to full water, full sulfur, volatile matter, ash content, calorific value, cold pressing strength and falling strength tests, and the results are shown in table 1.
Example 10
A granular briquette is prepared from coal mud powder 67 wt%, anthracite powder 18 wt%, sodium humate 2 wt%, potassium humate 2 wt% and water 11 wt%. Wherein the coal slime powder contains 5% of total water, 0.35% of total sulfur, 7% of volatile components, 26.5% of ash and 5400kcal/kg of heat productivity; the anthracite powder comprises 5.1% of total water, 0.47% of total sulfur, 7.4% of volatile components, 9.6% of ash and 6672kcal/kg of heat productivity.
A preparation method of granular coal comprises the following steps:
(1) drying coal slime produced by a coal gasification production device to obtain coal slime powder, and crushing and grinding anthracite into anthracite powder with the particle size of 2 mm;
(2) weighing 67 wt% of coal slime powder, 18 wt% of anthracite powder, 2 wt% of sodium humate, 2 wt% of potassium humate and 11 wt% of water, dissolving the weighed sodium humate and potassium humate in the water together, and preparing into an aqueous solution with the total mass fraction of 35 wt% of a binder;
(3) feeding the weighed coal slime powder and anthracite powder into a stirring device, adding the prepared binder aqueous solution for primary stirring, and then adding the rest water for secondary stirring until the slurry is uniform;
(4) and pressing the mixed slurry into a shape under 12MPa, and then drying at 90 ℃ for 2h and at 100 ℃ for 2h to obtain the granular coal.
The produced granulated coal was subjected to full water, full sulfur, volatile matter, ash content, calorific value, cold pressing strength and falling strength tests, and the results are shown in table 1.
Comparative example 1
The difference between the comparative example and the example 1 is that the binder is not added in the form of aqueous solution, but the weighed coal mud powder, anthracite powder, binder and water are added into the stirring device at the same time for mixing and stirring, and other process conditions are consistent with those of the example 1, so that the granular coal briquette is obtained.
The produced granulated coal was subjected to full water, full sulfur, volatile matter, ash content, calorific value, cold pressing strength and falling strength tests, and the results are shown in table 1.
Comparative example 2
The difference between the comparative example and the example 1 is that after the mixed slurry is pressed and formed, the mixed slurry is directly dried for 2 hours at 120 ℃ in the next step, and other process conditions are consistent with those of the example 1, so that the granular coal is obtained.
The produced granulated coal was subjected to full water, full sulfur, volatile matter, ash content, calorific value, cold pressing strength and falling strength tests, and the results are shown in table 1.
Comparative example 3
The difference between the comparative example and the example 1 is that the binder is not added in the form of aqueous solution, but the weighed coal mud powder, anthracite powder, binder and water are simultaneously added into a stirring device for mixing and stirring at one time, the mixed slurry is directly dried for 2 hours at 120 ℃ after being pressed and formed, and other process conditions are consistent with those of the example 1, so that the granular coal briquette is obtained.
The produced granulated coal was subjected to full water, full sulfur, volatile matter, ash content, calorific value, cold pressing strength and falling strength tests, and the results are shown in table 1.
Comparative example 4
The difference between the comparative example and the example 4 is that the binder is not added in the form of aqueous solution, but the weighed coal mud powder, anthracite powder, binder and water are added into the stirring device at the same time for mixing and stirring, and other process conditions are consistent with those of the example 4, so that the granular coal briquette is obtained.
The produced granulated coal was subjected to full water, full sulfur, volatile matter, ash content, calorific value, cold pressing strength and falling strength tests, and the results are shown in table 1.
Comparative example 5
The difference between the comparative example and the example 4 is that after the mixed slurry is pressed and formed, the mixed slurry is directly dried for 2 hours at 120 ℃ in the next step, and other process conditions are consistent with those of the example 4, so that the granular coal is obtained.
The produced granulated coal was subjected to full water, full sulfur, volatile matter, ash content, calorific value, cold pressing strength and falling strength tests, and the results are shown in table 1.
Comparative example 6
The difference between the comparative example and the example 4 is that the binder is not added in the form of aqueous solution, but the weighed coal mud powder, anthracite powder, binder and water are simultaneously added into a stirring device for mixing and stirring at one time, the mixed slurry is directly dried for 2 hours at 120 ℃ after being pressed and formed, and other process conditions are consistent with those of the example 4, so that the granular coal briquette is obtained.
The produced granulated coal was subjected to full water, full sulfur, volatile matter, ash content, calorific value, cold pressing strength and falling strength tests, and the results are shown in table 1.
Comparative example 7
The difference between the comparative example and the example 10 is that the binder is not added in the form of aqueous solution, but the weighed coal mud powder, anthracite powder, binder and water are simultaneously added into the stirring device for mixing and stirring at one time, and other process conditions are consistent with those of the example 10, so that the granular coal briquette is obtained.
The produced granulated coal was subjected to full water, full sulfur, volatile matter, ash content, calorific value, cold pressing strength and falling strength tests, and the results are shown in table 1.
Comparative example 8
The difference between the comparative example and the example 10 is that after the mixed slurry is pressed and formed, the mixed slurry is directly dried for 2 hours at 120 ℃ in the next step, and other process conditions are consistent with those of the example 10, so that the granular coal is obtained.
The produced granulated coal was subjected to full water, full sulfur, volatile matter, ash content, calorific value, cold pressing strength and falling strength tests, and the results are shown in table 1.
Comparative example 9
The difference between the comparative example and the example 10 is that the binder is not added in the form of aqueous solution, but the weighed coal mud powder, anthracite powder, binder and water are simultaneously added into a stirring device for mixing and stirring at one time, the mixed slurry is directly dried for 2 hours at 120 ℃ after being pressed and formed, and other process conditions are consistent with those of the example 10, so that the granular coal briquette is obtained.
The produced granulated coal was subjected to full water, full sulfur, volatile matter, ash content, calorific value, cold pressing strength and falling strength tests, and the results are shown in table 1.
TABLE 1
As can be seen from the detection results of Table 1 (examples 1 to 10), the granular coal of the present invention has the advantages of high strength, high heat value, low total sulfur, moisture, ash and volatile components, etc., wherein the total water is less than 4%, the total sulfur is less than 0.5%, the volatile components are less than 8%, the ash content is less than 20%, the calorific value is greater than 5900kcal/kg, the cold pressing strength is greater than 650N/piece, the falling strength is greater than 88%, and the requirements of the standard (DB13/2122-2014 clean granular coal) on the corresponding indexes are much higher. Comparing the test data of example 1 with comparative example 1/2/3, example 4 with comparative example 4/5/6, and example 10 with comparative example 7/8/9, it can be seen that the granulated coal prepared by the preparation method of the present invention has higher cold pressing strength and falling strength compared with the granulated coal prepared by the conventional preparation method in which coal powder, solid binder and water are added into a stirring device at one time to be mixed and stirred, and then the granulated coal is dried at high temperature in one step after compression molding.
Although the present invention has been described in terms of its functions and operations with reference to the embodiments, the present invention is not limited to the specific functions and operations described above, which are exemplary rather than limiting, and those skilled in the art can make many variations within the spirit and scope of the present invention without departing from the spirit and scope of the appended claims.
Claims (10)
1. The granular briquette is characterized by being prepared from coal slime powder, anthracite powder, a binder and water.
2. The particle type coal according to claim 1, wherein the coal mud powder, the anthracite powder, the binder and the water account for the following mass percent: 67-73 wt% of coal mud powder, 18-22 wt% of anthracite powder, 2-4 wt% of binder and 7-11 wt% of water; the sum of the mass percentages of the coal mud powder, the anthracite powder, the binder and the water is 100 wt%.
3. The granulated coal as claimed in claim 1, wherein the coal slurry powder is obtained by drying coal slurry produced by a coal gasification production device; the coal slime powder comprises 4-6% of total water, 0.3-0.4% of total sulfur, 3-7% of volatile components, 25-28% of ash and 5200-5400 kcal/kg of calorific value.
4. The granulated coal according to claim 1, wherein the anthracite fines have less than 6% total water, less than 0.5% total sulfur, less than 10% volatile matter, less than 12% ash, and a calorific value of more than 6500 kcal/kg.
5. The granular coal as claimed in claim 1, wherein the binder is one or both of sodium humate and potassium humate.
6. The granulated coal according to claim 1, wherein the granulated coal has a total water content of less than 4%, a total sulfur content of less than 0.5%, a volatile component of less than 8%, an ash content of less than 20%, a calorific value of more than 5900kcal/kg, a cold pressing strength of more than 650N/briquette, and a falling strength of more than 88%.
7. A method for preparing a granulated coal as claimed in any of claims 1 to 6, comprising the steps of:
(1) drying coal slime produced by a coal gasification production device to obtain coal slime powder, and crushing and grinding anthracite into anthracite powder;
(2) weighing coal mud powder, anthracite powder, a binder and water according to a certain mass percentage, and dissolving a part of weighed water into the binder to prepare a binder aqueous solution;
(3) feeding the weighed coal mud powder and anthracite powder into a stirring device, adding the prepared binder aqueous solution for primary stirring, and then adding the rest part of water for secondary stirring until the slurry is uniform;
(4) and pressing and molding the mixed slurry, and then carrying out secondary drying to obtain the granular coal.
8. The method for preparing granular coal briquette according to claim 7, characterized in that the pulverized and ground anthracite powder in the step (1) has a particle size of less than or equal to 3 mm.
9. The preparation method of the granular coal briquette according to claim 7, wherein the coal slime powder, the anthracite powder, the binder and the water in the step (2) are weighed according to the following mass percentages: 67-73 wt% of coal mud powder, 18-22 wt% of anthracite powder, 2-4 wt% of binder and 7-11 wt% of water; the sum of the mass percentages of the coal mud powder, the anthracite powder, the binder and the water is 100 wt%;
in the step (2), the binder is one or two of sodium humate and potassium humate, and the mass fraction of the binder contained in the prepared binder aqueous solution is 25-35 wt%.
10. The method for preparing the granular coal briquette according to claim 7, wherein the mixed slurry in the step (4) is pressed and molded under the pressure of 10MPa to 14 MPa; and (4) after the mixed slurry is pressed and formed, the first drying temperature is 70-90 ℃, the drying time is 2-3 h, the second drying temperature is 100-110 ℃, and the drying time is 1-2 h.
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