CN114181725A - Method for preparing semicoke from low-rank coal - Google Patents
Method for preparing semicoke from low-rank coal Download PDFInfo
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- CN114181725A CN114181725A CN202010958524.7A CN202010958524A CN114181725A CN 114181725 A CN114181725 A CN 114181725A CN 202010958524 A CN202010958524 A CN 202010958524A CN 114181725 A CN114181725 A CN 114181725A
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- 239000003245 coal Substances 0.000 title claims abstract description 107
- 238000000034 method Methods 0.000 title claims abstract description 39
- 238000003763 carbonization Methods 0.000 claims abstract description 40
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 24
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 24
- 238000001035 drying Methods 0.000 claims abstract description 16
- 239000007788 liquid Substances 0.000 claims abstract description 16
- 239000000571 coke Substances 0.000 claims abstract description 10
- 238000000926 separation method Methods 0.000 claims abstract description 5
- 239000002245 particle Substances 0.000 claims abstract description 4
- 239000007787 solid Substances 0.000 claims abstract description 4
- 238000006243 chemical reaction Methods 0.000 claims description 47
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 239000003077 lignite Substances 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 6
- 238000011068 loading method Methods 0.000 claims description 6
- 239000002802 bituminous coal Substances 0.000 claims description 5
- 239000003415 peat Substances 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims description 4
- 230000001276 controlling effect Effects 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 239000003610 charcoal Substances 0.000 claims 1
- 238000002347 injection Methods 0.000 abstract description 16
- 239000007924 injection Substances 0.000 abstract description 16
- 238000004519 manufacturing process Methods 0.000 abstract description 10
- 239000003344 environmental pollutant Substances 0.000 abstract description 3
- 231100000719 pollutant Toxicity 0.000 abstract description 3
- 238000000197 pyrolysis Methods 0.000 description 15
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 14
- 230000008569 process Effects 0.000 description 14
- 238000005516 engineering process Methods 0.000 description 10
- 239000002585 base Substances 0.000 description 8
- 238000005265 energy consumption Methods 0.000 description 8
- 229910000831 Steel Inorganic materials 0.000 description 7
- 239000000446 fuel Substances 0.000 description 7
- 229910052742 iron Inorganic materials 0.000 description 7
- 239000010959 steel Substances 0.000 description 7
- RHZUVFJBSILHOK-UHFFFAOYSA-N anthracen-1-ylmethanolate Chemical compound C1=CC=C2C=C3C(C[O-])=CC=CC3=CC2=C1 RHZUVFJBSILHOK-UHFFFAOYSA-N 0.000 description 6
- 239000003830 anthracite Substances 0.000 description 6
- 229910052783 alkali metal Inorganic materials 0.000 description 4
- 150000001340 alkali metals Chemical class 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 4
- 230000006872 improvement Effects 0.000 description 4
- 238000006068 polycondensation reaction Methods 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 230000002269 spontaneous effect Effects 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 238000007605 air drying Methods 0.000 description 2
- 238000007664 blowing Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000001027 hydrothermal synthesis Methods 0.000 description 2
- 230000009103 reabsorption Effects 0.000 description 2
- 230000035484 reaction time Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 239000000523 sample Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910001341 Crude steel Inorganic materials 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 239000011280 coal tar Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000010327 methods by industry Methods 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000004449 solid propellant Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000000844 transformation Methods 0.000 description 1
- -1 volatile matters Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B57/00—Other carbonising or coking processes; Features of destructive distillation processes in general
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B53/00—Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B57/00—Other carbonising or coking processes; Features of destructive distillation processes in general
- C10B57/08—Non-mechanical pretreatment of the charge, e.g. desulfurization
- C10B57/10—Drying
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Solid Fuels And Fuel-Associated Substances (AREA)
Abstract
The invention discloses a method for preparing semicoke by using low-rank coal, which mainly solves the technical problems that the existing semicoke prepared by using low-rank coal has poor grindability, high volatile component content, high moisture content, low fixed carbon content and calorific value and can not meet blast furnace injection. The technical scheme is that the method for preparing the semicoke by using the low-rank coal comprises the following steps: 1) pre-crushing low-rank coal, namely pre-crushing the low-rank coal to enable the coal with the particle size of less than 3mm to account for 75-80% of the total mass of the low-rank coal; 2) carrying out hydrothermal carbonization treatment on the low-rank coal to obtain hydrothermal carbonization liquid; 3) separating the hydrothermal carbonization liquid, and carrying out solid-liquid separation on the hydrothermal carbonization liquid to separate out solids, namely hydrothermal carbon; 4) and (4) performing hydrothermal carbon drying treatment, and drying the hydrothermal carbon to obtain the finished semi-coke. The method has the characteristics of low production cost, less pollutant emission in the production process, low moisture and ash content of the produced semicoke, fixed carbon, high calorific value and good grindability.
Description
Technical Field
The invention relates to a preparation method of semicoke, in particular to a method for preparing semicoke from low-rank coal, and belongs to the technical fields of low-rank coal quality improvement utilization technology, semicoke preparation technology and coal chemical industry.
Background
In 2019, the yield of Chinese crude steel is more than 9.8 hundred million tons, which accounts for over 53 percent of the world yield. Meanwhile, the steel industry is also a large consumer of energy and resource consumption, the energy consumption of the steel industry in China accounts for 12% -20% of the total energy consumption of the Chinese industry, the energy consumption is always at the head of each industry, the energy consumption of the pre-iron process accounts for about 70% of the total consumption of the steel industry, and the process is the link with the largest energy consumption and carbon dioxide emission, so the energy conservation and emission reduction of the steel industry is mainly performed in the iron making process.
The blast furnace coal powder injection technology is a main technical means for saving energy and reducing emission and reducing the production cost of iron making, and is widely applied to iron and steel enterprises at home and abroad at present. The blast furnace injection pulverized coal mainly comprises high-quality anthracite, but the high-quality anthracite is expensive due to the limited yield and storage of resources. The search for new cheap fuel resources for blast furnace iron making is one of the inevitable choices of reducing the dependence of iron and steel smelting on high-quality resources, reducing the damage of iron and steel production on the environment and simultaneously reducing the iron-making production cost.
The blast furnace blowing of the anthracite to replace the coke with scarce resources is an effective means for reasonably using resources and reducing cost for enterprises, and the same way of mixed blowing of the bituminous coal (including peat and lignite) and the anthracite is an effective means for improving the burning rate of the anthracite and saving the scarce resources of the anthracite.
The low-rank coal resources (peat, lignite and bituminous coal) are rich, and if the low-rank coal resources can be efficiently applied to blast furnace injection, the low-rank coal resources play an important role in cost reduction and efficiency improvement of iron-making production and enterprise competitiveness improvement.
The low-rank coal has the problems of high moisture and volatile component contents, low fixed carbon and calorific value, poor grindability and easy spontaneous combustion, so that the low-rank coal is difficult to be efficiently applied to a blast furnace fuel injection technology. In order to enable the low-rank coal to meet the requirements of the blast furnace fuel injection technology, the quality of the low-rank coal needs to be improved.
The low-rank coal such as peat, lignite, bituminous coal and the like has low heat value and high explosiveness, and has limitation in use. Many enterprises use the semicoke formed after the low-temperature dry distillation to blow, so that the heat value and the safety of the pyrolysis semicoke are improved, but the grindability of the pyrolysis semicoke is poor, the powder making capability is influenced, and the abrasion to equipment is greatly increased.
The Chinese patent application with application publication number CN102994122A discloses a method and equipment for upgrading low-rank coal, which adopts a process of passivating semicoke and slowly cooling semicoke in situ by pyrolysis coal tar, improves the strength of the semicoke, reduces the apparent chemical property of the semicoke, and ensures that the produced low-rank coal semicoke has the characteristics of low ignition point, high heat value, stable combustion and high strength.
The Chinese patent application with application publication number CN103666508A discloses a low-rank coal low-temperature dry distillation pyrolysis process, which aims at the problems of resource waste, energy consumption and pollutant emission of low-rank coal such as brown coal at present, adopts a coupling method of a grading separation technology and a grading drying technology, solves the problems of low heat value, high ash content and high sulfur content of low-rank coal pyrolysis semicoke, improves the utilization rate of raw materials and reduces the cost of the raw materials.
The feasibility of the pyrolysis upgrading semicoke of low-rank coal applied to blast furnace injection production is systematically analyzed in the literature "analysis of blast furnace injection semicoke and performance thereof" (Yang Shuangping, Chuan \2815634, Zhenghuaan, Liangjie, Zhang Shengjun, Xuehi, proceedings of Process engineering, 14(5):897 one 899), and the result shows that the grindability of the pyrolysis semicoke is poor due to the plastic polycondensation reaction of the low-rank coal in the high-temperature pyrolysis process, and the requirement of the blast furnace injection pulverized coal technology is difficult to meet.
The research on the grindability action mechanism of the upgraded low-rank coal through the change of the physicochemical characteristics of the low-rank coal (Yangyi 28635Zhejiang university, 2019) is carried out on the change rule of the grindability of the upgraded low-rank coal through pyrolysis, but the problem of poor grindability of the upgraded low-rank coal and the semicoke is not fundamentally solved.
Hydrothermal carbonization is an organic combustible drying and quality-improving technology developed in recent years, and the important difference between the hydrothermal carbonization process and the pyrolysis carbonization process is that the reaction initiated by the hydrothermal carbonization process is carried out in the medium of high-temperature liquid-phase water, so that the treatment condition is mild, the secondary pollution risk is low, and the energy consumption and the cost are low.
In the literature, "experimental research on influence of hydrothermal upgrading on physicochemical properties of low-rank coal" (Zhao Bojun, Harbin Industrial university, 2016), lignite is taken as a research object, changes of moisture reabsorption and spontaneous combustion characteristics of the low-rank coal are focused, and results show that the moisture reabsorption and spontaneous combustion capabilities of the low-rank coal are reduced and the rank of the low-rank coal is improved after upgrading. But the heating temperature of the hydrothermal carbonization technology is lower than 374 ℃, and compared with the pyrolysis quality-improved semicoke, the obtained low-rank coal quality-improved semicoke has the characteristics of higher volatile content, lower fixed carbon content and lower calorific value, and is difficult to be used as high-quality blast furnace injection fuel.
The semicoke prepared from the low-rank coal disclosed in the prior art has poor grindability, high volatile component content, low fixed carbon content and low calorific value, and the semicoke prepared from the low-rank coal cannot meet the blast furnace injection requirement.
Disclosure of Invention
The invention aims to provide a method for preparing semicoke by using low-rank coal, which mainly solves the technical problems that the existing semicoke prepared by using low-rank coal has poor grindability, high moisture content, low fixed carbon content and calorific value and can not meet blast furnace injection.
The technical scheme adopted by the invention is that the method for preparing the semicoke by using the low-rank coal comprises the following steps:
1) pre-crushing low-rank coal, namely pre-crushing the low-rank coal to enable the coal with the particle size of less than 3mm to account for 75-80% of the total mass of the low-rank coal;
2) carrying out hydrothermal carbonization treatment on the low-rank coal, firstly loading the crushed low-rank coal into a high-pressure reaction kettle, and sealing the high-pressure reaction kettle after coal loading is finished; regulating and controlling the reaction temperature and pressure in the high-pressure reaction kettle; introducing high-pressure superheated steam into the high-pressure reaction kettle, heating the coal-water mixture in the high-pressure reaction kettle for 20-180 min, and carrying out hydrothermal carbonization reaction on low-rank coal to obtain hydrothermal carbonization liquid;
3) separating the hydrothermal carbonization liquid, and carrying out solid-liquid separation on the hydrothermal carbonization liquid to separate out solids, namely hydrothermal carbon;
4) and (4) performing hydrothermal carbon drying treatment, and drying the hydrothermal carbon to obtain the finished semi-coke.
The low-rank coal is one or a mixture of lignite, bituminous coal and peat.
Further, carrying out hydrothermal carbonization treatment on the low-rank coal, wherein the reaction temperature in the high-pressure reaction kettle is 220-370 ℃, and the reaction pressure is 2-8 MPa;
further, carrying out hydrothermal carbonization treatment on the low-rank coal, wherein the pressure of high-pressure superheated steam is 3-10 MPa, and the temperature of the high-pressure superheated steam is 380-550 ℃.
Further, carrying out hydrothermal carbonization treatment on the low-rank coal, wherein the hydrothermal carbonization reaction time is 20-180 min.
Further, drying the hydrothermal carbon, wherein the drying medium is superheated steam discharged from the high-pressure reaction kettle.
The high-pressure reaction kettle is used as a hydrothermal carbonization container, has a sealing function, has the heat resistance temperature of 300-550 ℃ and the high pressure resistance of 3-10 MPa, is provided with a temperature probe and a water level probe, and can control the temperature and the water amount in the reaction container in the reaction process.
The low-rank coal semicoke produced by the method has the advantages that the moisture content of an air drying base is 3-10%, the volatile matter of the drying base is 15-26%, the ash content of the drying base is 5-11%, the Haugh Grindability Index (HGI) is 60-90, and the high-order calorific value of the air drying base is 23-31 MJ/kg; compared with raw coal or raw mixed coal, the moisture content of the prepared semicoke is reduced; the ash content is reduced, and the alkali metal content in the ash is reduced; the fixed carbon content is increased, and the high calorific value is increased; the grindability is improved.
The low-rank coal semicoke prepared by the method disclosed by the invention is used as a high-quality blast furnace injection fuel, meets the requirement of blast furnace injection, expands the application range of low-rank coal, and improves the application value of the low-rank coal.
The key process parameters of the method are selected for the following reasons:
1. setting of reaction temperature and reaction pressure in high-pressure reactor
The reaction temperature in the high-pressure reaction kettle is set to be 220-370 ℃ so as to accelerate the precipitation and removal of water, volatile matters, ash and alkali metals in the low-rank coal, improve the hydrothermal carbonization efficiency, inhibit the occurrence of plastic polycondensation reaction in the quality improvement process of the low-rank coal and improve the grindability of the low-rank coal semicoke; the reaction pressure is 2.0-8.0 MPa, so that the safety of the hydrothermal reaction kettle in the carbonization reaction process is ensured, when the saturated steam pressure of water in the reaction kettle reaches the set pressure of equipment, the pressure reducing valve is automatically opened, the superheated high-pressure steam is discharged, and the pressure in the kettle is reduced to ensure the safe production.
2. Setting of pressure and temperature of high pressure superheated steam
The heat of the low-rank coal hydrothermal carbonization reaction comes from high-pressure superheated steam, and according to the hydrothermal carbonization temperature and pressure set by the reaction kettle, superheated steam with higher pressure (3-10 MPa) and higher temperature (380-550 ℃) is needed to continuously provide a heat source for the reaction kettle, so that the hydrothermal carbonization reaction is continuously performed. Meanwhile, the superheated steam with higher temperature (380-550 ℃) can further remove volatile components in the low-rank coal, and the fixed carbon content and the calorific value of the prepared semicoke are improved.
3. Setting of coal heating time in high-pressure reaction kettle
The heating time of coal in the high-pressure reaction kettle, namely the hydrothermal carbonization reaction time, is controlled to be 20-180 min, so that the hydrothermal carbonization reaction of the low-rank coal is completely carried out, and the quality of the prepared semicoke is kept stable.
The technical scheme of the invention is based on the following research of an applicant, and the applicant finds that the superheated steam can heat the low-rank coal to a higher temperature through years of research and experiments, so that a large amount of moisture and volatile components in the low-rank coal are removed, and the fixed carbon content and calorific value of the upgraded semicoke are improved; the hydrothermal process is adopted to inhibit the occurrence of plastic polycondensation reaction in the quality-improving process of the low-rank coal, improve the grindability of the quality-improving semicoke of the low-rank coal and meet the requirement of blast furnace injection fuel.
The invention adopts a coupling method, and a method for using hydrothermal carbonization and superheated steam (drying and upgrading) together. The hydrothermal carbonization is coupled with the superheated steam to treat the high volatile coal, so that the volatile content in the semicoke is reduced; compared with a pyrolysis process (low-temperature dry distillation), the method further improves the heat value of the semicoke, reduces the moisture of the semicoke and greatly improves the grindability of the semicoke; thoroughly solve the poor and equipment wearing and tearing problem of powder process ability of semicoke.
Compared with the prior art, the invention has the following positive effects: 1. the method adopts the superheated steam assisted hydrothermal carbonization method to improve the quality of the low-rank coal to produce the semicoke, has the characteristics of wide raw material sources, simple equipment and device operation method, low energy consumption and production cost, and less pollutant emission in the production process, and is easy to popularize and use. 2. The semicoke produced by the method has low volatile content, high fixed carbon and calorific value and good grindability, and can be used as high-quality fuel for blast furnace ironmaking injection; the semicoke produced by the method has low ash content and alkali metal content.
Detailed Description
The present invention is further illustrated by the following examples, which are shown in tables 1 to 2.
A method for preparing semicoke from low-rank coal comprises the following steps:
1) pre-crushing low-rank coal, namely pre-crushing the low-rank coal to enable the coal with the particle size of less than 3mm to account for 75-80% of the total mass of the low-rank coal;
2) carrying out hydrothermal carbonization treatment on the low-rank coal, firstly loading the crushed low-rank coal into a high-pressure reaction kettle, and sealing the high-pressure reaction kettle after coal loading is finished; regulating and controlling the reaction temperature and pressure in the high-pressure reaction kettle; introducing high-pressure superheated steam into the high-pressure reaction kettle, heating the coal-water mixture in the high-pressure reaction kettle for 20-180 min, and carrying out hydrothermal carbonization reaction on low-rank coal to obtain hydrothermal carbonization liquid;
3) separating the hydrothermal carbonization liquid, and carrying out solid-liquid separation on the hydrothermal carbonization liquid to separate out solids, namely hydrothermal carbon;
4) and (4) performing hydrothermal carbon drying treatment, and drying the hydrothermal carbon to obtain the finished semi-coke.
The semi-coke raw coal performance parameters of the embodiment of the invention are shown in table 1, and the semi-coke performance parameters are shown in table 2.
TABLE 1 preparation of semi-coke raw coal Performance parameters for the inventive examples
TABLE 2 weight percentages and semi-coke performance parameters of semi-coke blended coal in the examples of the present invention
As shown in Table 2, the air-drying-base moisture content of the semicoke prepared from the low-rank coal in the schemes 1 to 9 is 3 to 10 percent, the drying-base volatile matter is 15 to 26 percent, the drying-base ash is 5 to 11 percent, the Hawski Grindability Index (HGI) is 60 to 90, and the air-drying-base high-grade calorific value is 23 to 31 MJ/kg. Compared with raw coal or raw mixed coal, the moisture content of the prepared semicoke is reduced; the ash content is reduced, and the alkali metal content in the ash is reduced; the fixed carbon content is increased, and the high calorific value is increased; the grindability is improved. The prepared semicoke meets the performance requirement of the solid fuel injected by the blast furnace.
In addition to the above embodiments, the present invention may have other embodiments. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention.
Claims (5)
1. A method for preparing semicoke from low-rank coal is characterized by comprising the following steps:
1) pre-crushing low-rank coal, namely pre-crushing the low-rank coal to enable the coal with the particle size of less than 3mm to account for 75-80% of the total mass of the low-rank coal;
2) carrying out hydrothermal carbonization treatment on the low-rank coal, firstly loading the crushed low-rank coal into a high-pressure reaction kettle, and sealing the high-pressure reaction kettle after coal loading is finished; regulating and controlling the reaction temperature and pressure in the high-pressure reaction kettle; introducing high-pressure superheated steam into the high-pressure reaction kettle, heating the coal-water mixture in the high-pressure reaction kettle for 20-180 min, and carrying out hydrothermal carbonization reaction on low-rank coal to obtain hydrothermal carbonization liquid;
3) separating the hydrothermal carbonization liquid, and carrying out solid-liquid separation on the hydrothermal carbonization liquid to separate out solids, namely hydrothermal carbon;
4) and (4) performing hydrothermal carbon drying treatment, and drying the hydrothermal carbon to obtain the finished semi-coke.
2. The method for preparing semicoke from low-rank coal according to claim 1, wherein the low-rank coal is one or more of lignite, bituminous coal and peat.
3. The method for preparing semicoke from low-rank coal as claimed in claim 1, wherein the low-rank coal is subjected to hydrothermal carbonization treatment, the reaction temperature in the high-pressure reaction kettle is controlled to be 220-370 ℃, and the reaction pressure is 2-8 MPa; the pressure of the high-pressure superheated steam is 3-10 MPa, and the temperature of the high-pressure superheated steam is 380-550 ℃.
4. The method for preparing semicoke from low-rank coal as claimed in claim 1, wherein the hydrothermal charcoal is dried, and the drying medium is superheated steam discharged from a high-pressure reaction kettle.
5. The method for preparing semicoke from low-rank coal as claimed in claim 1, wherein the semicoke has an air-drying-basis moisture content of 3 to 10%, a drying-basis volatile matter content of 15 to 26%, a drying-basis ash content of 5 to 11%, a Hawski grindability index of 60 to 90, and an air-drying-basis high calorific value of 23 to 31 MJ/kg.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115772432A (en) * | 2023-02-13 | 2023-03-10 | 山西潞安环保能源开发股份有限公司 | Low-rank coal modification method and coal injection and blending system |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20190225523A1 (en) * | 2018-01-23 | 2019-07-25 | Evac Oy | Method and System for Treatment of Organic Waste |
| CN110218826A (en) * | 2019-07-12 | 2019-09-10 | 北京科技大学 | A kind of method that biomass by hydro-thermal charcoal carries out blast furnace blowing |
| CN110982542A (en) * | 2019-11-12 | 2020-04-10 | 北京科技大学 | Method for preparing blast furnace blowing semicoke from low-rank coal based on hydrothermal reaction |
-
2020
- 2020-09-14 CN CN202010958524.7A patent/CN114181725A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20190225523A1 (en) * | 2018-01-23 | 2019-07-25 | Evac Oy | Method and System for Treatment of Organic Waste |
| CN110066666A (en) * | 2018-01-23 | 2019-07-30 | 埃瓦克有限公司 | For handling the method and system of organic waste |
| CN110218826A (en) * | 2019-07-12 | 2019-09-10 | 北京科技大学 | A kind of method that biomass by hydro-thermal charcoal carries out blast furnace blowing |
| CN110982542A (en) * | 2019-11-12 | 2020-04-10 | 北京科技大学 | Method for preparing blast furnace blowing semicoke from low-rank coal based on hydrothermal reaction |
Non-Patent Citations (3)
| Title |
|---|
| 周安宁等: "洁净煤技术", 28 February 2018, 中国矿业大学出版社, pages: 32 - 33 * |
| 无锡气动技术研究所: "气动元件产品样本", 30 September 2000, 机械工业出版社, pages: 131 * |
| 李燕;顾小玲;王智化;黄镇宇;周俊虎;岑可法;: "水热提质对低阶煤裂解特性的影响", 煤炭转化, no. 01, pages 12 - 16 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115772432A (en) * | 2023-02-13 | 2023-03-10 | 山西潞安环保能源开发股份有限公司 | Low-rank coal modification method and coal injection and blending system |
| CN115772432B (en) * | 2023-02-13 | 2023-04-28 | 山西潞安环保能源开发股份有限公司 | Low-rank coal modification method, injection coal and coal blending system |
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