• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Low rank coal is dewatered and upgraded by heating a coal/water mixture at 150 DEG to 300 DEG C. at a pressure preventing water vaporization, mechanically separating the water, then heating the coal at 300 DEG to 400 DEG C. at a pressure allowing water vaporization.
    公开号:SU1099848A3
    申请号:SU792860254
    申请日:1979-12-17
    公开日:1984-06-23
    发明作者:Ван Раам Лепольд；Петрус Руйтер Герман；Вильгельмус Ван Бройгель Йозефус
    申请人:Шелл Интернэшнл Рисерч Маатсхаппий Б.В. (Фирма)；
    IPC主号:
    专利说明:

    Electricity relates to the coal and coke industry, in particular to dewatering methods of low-grade coals. A known method of dewatering low-grade coal involves heating the coal in the presence of water to 150-ZOO C at a pressure equal to the pressure of water vapor at a given temperature, separating part of the liquid aqueous phase from the coal and then heating the coal with hydrogen to 300-340 C and a pressure equal to the pressure water vapor at a given temperature l. The disadvantage of this method is the low calorific value of the treated coal. The aim of the invention is to increase the calorific value of coal. The goal is achieved by the method of dewatering low-grade coal, which includes heating the coal in the presence of water to 150-ZOO C at a pressure equal to the pressure of water vapor at a given temperature, separating part of the liquid aqueous phase from the coal and subsequent heating with coal water vapor to 300340 ° C , heating to 300-340 ° C is carried out with steam at a pressure not higher than 50 atm. Low-grade coal may contain up to 90% water, but usually has a water content of 40-70%. Water may be present in vapor form, for example, chemically bound in the form of a gel or absorbed water. To keep the calorific value of low-grade coal, it is necessary to remove most of the moisture from the coal. Moisture can be removed from the carbon through thermal drying. During thermal drying, there is practically no structural change in coal, so that the resulting dried product remains hydrophilic and, in the presence of moisture, can re-absorb it from the environment. During thermal drying, the calorific value of coal increases slightly. The proposed method relates to methods for the dehydration of low-grade hard coal, in which decarboxylation of coal occurs (removal of oxygen-containing groups). Decarboxylation occurs at terapatipax above 300 ° C and leads to a structural change in coal. Coal becomes hydrophobic by removing oxygen-rich polar groups, which affect the hydrophilic properties of coal. When water is separated from the coal, there is no tendency for secondary moisture absorption. The drawing shows an installation diagram for carrying out the proposed method. The installation comprises an apparatus 1.at 1 of the first heating zone, an apparatus 2 of the second heating zone, an apparatus 3 for evacuating the treated coal, a conduit 4 for supplying coal to the apparatus 1, a conduit 5 for supplying superheated steam from the apparatus 2 to the apparatus 1, a conduit 6 for draining water from apparatus 1, pipeline 7 for supplying water to pipeline 4 for preparing a suspension, pipeline 8 for draining excess water from the installation, pipeline 9 for draining gases from apparatus 1, pipeline 10. connecting apparatus 1 with apparatus 2, pipeline 11 for supplying superheated couple in apparatus 2, pipeline 12 for supplying coal from apparatus 2 to apparatus for evacuating, pipeline 13 for evacuating gases from apparatus 3 for evacuating, pipeline 14 for withdrawing treated coal, Low-grade coal has a low thermal conductivity. In order to increase heat transfer to coal, the treatment of coal is carried out in the presence of water. Suspension containing low-grade coal with a particle size of about 5 mm in 40-50% water, pipeline 4 serves B apparatus 1 of the first heating zone, where it is heated to 200-250 C at a pressure of 30-45 atm by supplying superheated steam through the pipeline 5 from the apparatus 2 of the second heating zone. Under such conditions, the pressure exceeds the pressure of the water resulting from this, the water remains in the liquid phase and its latent heat of evaporation is not used. After heating and the necessary time for maintenance, which depends on the characteristics and age of the coal, as well as on the temperature used. coal from the apparatus 1 from the first heating zone through the pipeline 10 is fed into the apparatus 2 - the second heating zone. In the first stage, the coal loses about 3/4 of the initial water content and partially increases its calorific value. From apparatus 1, pipeline 6 discharges water in such an amount that the ratio of coal to water in the suspension supplied to the second zone is in the order of 1 hour, water to 1 hour of coal. A portion of the water having a temperature of 200-250 s is circulated through conduit 7 to prepare a coal-water slurry supplied for heating to the first zone. Excess water after cooling and separation of pollutants, which may include mineral substances, dissolved sulfur compounds, is discharged through line 8. In apparatus 2, the mixture is heated to 320-350 ° C and pressure not higher than 50 atm by supplying superheated steam supplied through line 11 At this temperature and pressure, water passes into the vapor phase and during treatment in the second zone, any water remaining on the surface of the coal evaporates quickly, and the bound water is released and evaporated, and the polar oxygen containing groups are converted. zovyvayuts in SB. From the apparatus 2 through the pipeline 12, the treated coal is fed to the apparatus 3, where it is evacuated. Gases and the remaining steam are removed through line 13. Typically, gases contain water vapor, some H and traces of other gases, such as light hydrocarbons and a significant portion of CO, produced in the second zone due to decarboxylation, which occurs in the second stage. A certain amount of gas is also removed from the first zone through line 9. Gases contain a large amount of hydrocarbons, they are used for heating necessary for the process. Example 1. 654.5 g of brown coal, containing 256.2 g of organic matter, 394.7 g of water (60.3%) and 3.6 ashes, having a calorific value of 6370 kcal / kg and a mass density of 0.21 kg Organic matter per 1 liter and 65.5 g of water is treated in a 2-liter autoclave. The mixture is heated for 80 minutes to a temperature of 250 ° C and at a pressure of 45 bar. After heating, water is removed. Then it is heated for 35 minutes to a temperature of 340 ° C at a pressure of 50 bar. The contents of the autoclave are then cooled to ambient temperature and the pressure is released. The resulting product contains 227 g of organic matter, 3.7 g of ash and 33.3 g of water (12.6%). Mass density is 0.46 kg of organic matter in 1 liter and calorific value is 6880 kcal / kg. During the second treatment stage, 9.9 L (19.6%) of CO2 and 3.4 g of resin are obtained. Example 2 150 g of Australian brown coal (particles in the order of 10 mm) are treated in a 350 cm autoclave in the presence of 90 cm of water. The temperature is increased gradually at 80 C / min. Experiment 1: coal is heated at about 250 C at a pressure of 45 bar. Experiment 2: coal is heated at about 340 ° C at a pressure of 200 bar. Experiment 3: The coal is heated at a pressure of 45 bar. Water is removed at a temperature of 50 ° C and the coal is heated at a pressure of 50 bar with steam to a temperature. The calorific value of the moisture content is measured. The results are tabulated. Download The best results are obtained in experiment 3.
    5 1099848
    PRI me R 3. Coal Example 4. (known). Canagretiya to when the pressure coal is heated to 250 C at
    45 bar, drain water at 250 ° C and a pressure of 45 bar, drain water at
    The coal is heated with water vapor 250 C and the coal is heated
    to prn pressure of 50 bars. Obra-5 hydrogen up to 340 ° C under pressure
    Coal contains 9 wt.% Ate-50 bar. Treated coal contains
    Its thermal conductivity and its 9% moisture and thermal conductivity is 7786 kcal / kg. It is 7286 kcal / kg.
    权利要求:
    Claims (1)
    [1]
    METHOD FOR DEHUMIDING LOW-SORT COAL, including heating coal in the presence of water to 150300 ° C at a pressure equal to the pressure of water vapor at a given temperature, separating part of the liquid aqueous phase from coal and subsequent heating of coal to 300-340 ° C, characterized in that, in order to increase the calorific value of coal, heating to 300-340 C is carried out with water vapor at a pressure of no higher than 50 atm.
    类似技术:
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    同族专利:
    公开号 | 公开日
    YU40585B|1986-02-28|
    GR73670B|1984-03-28|
    AU5391879A|1980-06-26|
    US4285140A|1981-08-25|
    RO78345A|1982-03-24|
    CS217974B2|1983-02-25|
    DE2950807A1|1980-07-03|
    TR21073A|1983-06-23|
    NL7812248A|1980-06-20|
    PL128548B1|1984-02-29|
    HU182594B|1984-02-28|
    PL220476A1|1980-09-08|
    NZ192419A|1982-08-17|
    ATA792279A|1983-12-15|
    YU304779A|1983-01-21|
    CA1145699A|1983-05-03|
    AT375386B|1984-07-25|
    AU529062B2|1983-05-26|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
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    GB1471949A|1974-06-19|1977-04-27|Shell Int Research|Process for the upgrading of coal or the like|AT366405B|1980-01-21|1981-04-13|Voest Alpine Ag|METHOD FOR DRYING AND CONVERTING ORGANIC SOLIDS, ESPECIALLY BROWN COALS WITH STEAM|
    JPH0240951B2|1985-05-02|1990-09-13|Dengen Kaihatsu Kk|
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    US5071447A|1989-10-31|1991-12-10|K-Fuel Partnership|Apparatus and process for steam treating carbonaceous material|
    US5290523A|1992-03-13|1994-03-01|Edward Koppelman|Method and apparatus for upgrading carbonaceous fuel|
    CN1078607C|1995-08-09|2002-01-30|Kfx公司|Method and apparatus for reducing by-products content in carbonaceous materials|
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    US20080000215A1|2000-03-02|2008-01-03|Duncan Ronnie J|Engine systems and methods|
    AU2001293486B2|2000-09-26|2006-11-09|Evergreen Energy Inc.|Upgrading solid material|
    US7383766B2|2001-08-29|2008-06-10|Mte Research Pty Ltd|Coal dewatering system and method|
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    NL7812248A|NL7812248A|1978-12-18|1978-12-18|THERMAL TREATMENT OF CABBAGE.|
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