• 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:

    公开号:SE1051093A1
    申请号:SE1051093
    申请日:2010-10-21
    公开日:2011-04-27
    发明作者:Jorma Kautto
    申请人:Vapo Oy；
    IPC主号:
    专利说明:

    the air for drying biomass is usually lower than 115 ° C, usually about 90-110 ° C. At higher temperatures, wood chips begin to emit significant amounts of volatile compounds, such as terpenes, commonly known as VOCs (volatile organic compounds).
    A number of different techniques are known in the art for drying biomass, the most established of them being the use of a wire dryer. Typically, the wire of a wire dryer has a maximum width of 6 m and a length of 60 m. The biomass is placed on the wire in the form of an even layer. The thickness of the layer can amount to, for example, 150 mm. The wire consists of a cloth which is permeable to air and which is usually made of plastic or metal material. In the drying process, a fan is arranged under the wire to generate a negative pressure to suck hot drying air through the bed of biomass. As it passes through the bed, the air becomes moist, thus reducing the water content of the biomass.
    In addition to the techniques described above, embodiments are known in the art whose bed of biomass is divided at the end of the wire into two flows. In one embodiment, the biomass dried in the first passage is screened and the fine particles, which dry faster, are separated from the coarse fraction. The coarse fraction is recycled to the top of the upper surface of the biomass bed, after which it is further dried. The coarse fraction is removed from the surface of the bed at the delivery end of the wire.
    As mentioned above, the drying of a wire dryer is usually effected by means of cold ambient air which is sucked by negative pressure through a heat exchanger. A disadvantage of this known embodiment is that if the water circulation ceases during the winter, and the ambient temperature is below the freezing point of water, the water present in the heat exchanger will freeze. Freezing can result in damage and leakage of the heat exchangers. This problem has also occurred in practice in plants where biomass is dried.
    The method according to the invention now offers a new arrangement which makes it possible to avoid the problems with the prior art. The important features of the invention are crucial elements of the method and its use as defined in the claims.
    This results in the arrangement according to the invention offering improved efficiency with respect to the heating of the drying air used in the dryer for biomass, such as a wire dryer. More particularly, the invention is characterized by what is stated in the claims. The invention is particularly characterized by the use of a water-glycol mixture or other non-freezing medium in an intermediate circuit. In accordance with the above description, the invention relates to a new method for heating the drying air to a biomass dryer by means of an intermediate circuit and the use of a circulating medium used therein, in such a way that the plant which produces biofuels, is integrated with another industrial plant. This type of industrial plant consists, for example, of a pulp or paper mill. The plant that produces biofuels are, for example, plants that produce biodiesel or alcohols that are used as vehicle fuels.
    The invention is described in more detail below by means of a preferred embodiment in the form of an example with reference to the attached Fig. 1, wherein Fig. 1 illustrates an embodiment for implementing the method.
    The invention relates to a method for heating the drying air to a dryer for biomass, such as the heating air used in a wire dryer. According to Fig. 1, the invention is characterized by the use of a water-glycol mixture or other non-freezing medium, such as non-freezing alcohols, in an intermediate circuit.
    An important feature of the invention is that it now allows heating of the drying air under very unfavorable conditions without the risk of freezing. In this regard, the process heats the air to the dryer by means of heat exchangers heated with water-glycol mixtures, in which the ratio of water to glycol is about 50/50 or 60/40.
    Another important feature is that the water-glycol circuit in the process is heated in a priority order. Preferably, this is done in such a way that in the first step, water with a lower heat content is utilized, such as those available from the integrated plant at a temperature of approx. + 45 ° C or equivalent cooling water from the BtL process. In the second step, hot water available from the integrated paper mill is used, such as the cooling water from a flue gas scrubber, eg 65 ° C. Thereafter, the circulating mixture of water and glycol can be heated by means of other available (pressurized) waters at a temperature of 65-150 ° C. Finally, the temperature of the circulating mixture of water and glycol is peaked by means of steam obtained from the plant's own process or a boiler, whereby the condensation energy of the steam is recovered. The number of heat exchangers connected in a series can thus vary depending on the type of available energy sources, a typical number of heat exchangers is 4 to 6.
    Topping in this respect means that, after the basic energy for drying has been obtained from hot water, the extra energy can be obtained from steam generated in such an amount that the total heat demand is satisfied. This means that the energy consumption for drying is topped up by steam that supplies the marginal heat demand. This terminology is traditionally used in energy technology.
    The efficiency of the process is further improved by collecting energy from several sources, whereby the water-glycol circuit is mounted close to the heat sources. This arrangement makes it possible to dry a biomass using hot water with a smaller heat content at a temperature of about 40-100 ° C, which is thereby compatible with the requirements for the air temperature when drying biomass.
    When operating a water-glycol circuit, it is important to keep the pressure of the hot water circuits above that of the water-glycol circuit. In the event of damage to the heat exchangers, leakage takes place from the hot water circuit into the water glycol circuit. This results in that the return flow to, for example, the boiler circuits can be kept free of substances that are harmful to their operation. Alternatively, the water-glycol circuit may contain trace elements, the presence of which in the return water is monitored. In the event of a leak, the location of the fault can be identified and repaired at as early a stage as possible or the leaking heat exchanger can be switched off.
    It will be apparent to one skilled in the art that the invention is not limited to the exemplary embodiments described above but may instead be varied within the scope of the invention as defined in the appended claims.
    权利要求:
    Claims (10)
    [1]
    Method for heating the drying air to a biomass dryer, such as the drying air used in a wire dryer, characterized in that the drying air is heated by means of a water-glycol mixture or some other equivalent non-freezing medium flowing in an intermediate circuit, wherein the medium is heated by means of thermal energy obtained from another industrial plant integrated with a plant for the production of liquid biofuels.
    [2]
    Process according to Claim 1, characterized in that the heating of the air to the dryer is effected by means of heat exchangers heated with water-glycol mixtures, in which the ratio of water to glycol is about 50/50 or 60/40.
    [3]
    Method according to claim 1 or 2, characterized in that the thermal energy in the intermediate circuit is collected from a plurality of different sources and, when necessary, the circulating circuit of water-glycol is arranged in the vicinity of the thermal energy sources.
    [4]
    Method according to one of Claims 1 to 3, characterized in that the water-glycol circuit in the process is heated in a special priority order in such a way that, in the first step, water with a lower heat content, such as those available from the integrated the plant at a temperature of approx. 45 ° C or equivalent cooling water from the BtL process, whereupon, in the second step, hot water available from the integrated pulp mill is used, such as the cooling water from eg a flue gas scrubber.
    [5]
    Process according to one of Claims 1 to 4, characterized in that the temperature of the circulating mixture of water and glycol is topped up by means of steam or an equivalent process heat source, in particular if there is a shortage of hot water, for example winter time. .
    [6]
    Method according to one of Claims 1 to 5, characterized in that the water-glycol circuit is cooled by means of, for example, seawater if the drying plant cannot receive all the hot water.
    [7]
    Use of a water-glycol mixture or other equivalent non-freezing medium in an intermediate circuit for heating the drying air to a biomass dryer, such as a wire dryer.
    [8]
    Use according to claim 7 for heating the inlet air to a dryer for biomass by means of an intermediate circuit, whereby the heating of the inlet air to the dryer is effected by means of heat exchangers using water-glycol mixtures, in which the ratio between water and glycol is about 50 / 50 or 60/40.
    [9]
    Use according to claims 7 and 8 for heating the inlet air to a biomass dryer by means of an intermediate circuit and the use of liquid circulated therein in such a way that the plant in which biofuels are produced is integrated with another industrial plant.
    [10]
    Use according to any one of claims 7-9 for heating the inlet air to a biomass dryer, whereby the plant with which biofuels are produced consists, for example, of a plant for the production of biofuels or alcohols used as vehicle fuels, and the industrial plant, which is integrated with it, consists of, for example, a pulp or paper mill.
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    同族专利:
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    法律状态:
    2016-05-31| NUG| Patent has lapsed|
    优先权:
    申请号 | 申请日 | 专利标题
    FI20096097A|FI124016B|2009-10-26|2009-10-26|Process for heating drying air used in a biomass dryer by means of an intermediate circuit and using a water-glycol mixture or similar frost-free intermediate circuit liquid to heat drying air used in a biomass dryer|
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