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KR-102962599-B1 - Solid biomass fuel production process

KR102962599B1KR 102962599 B1KR102962599 B1KR 102962599B1KR-102962599-B1

Abstract

The present invention relates to a process for producing solid biomass fuel and solid biomass fuel produced by said process. Additionally, the present invention relates to a combustion process comprising the step of burning said solid biomass fuel to produce energy.

Inventors

  • 바이, 홍 메이

Dates

Publication Date
20260511
Application Date
20200513
Priority Date
20190513

Claims (20)

  1. As a production process for solid biomass fuel, The above process consists of the following steps: (i) a grinding step of grinding one or more biomass sources to provide biomass powder having an average particle size (D50) of 1000 μm to 6000 μm; (ii) a molding step of molding the biomass powder to provide a molded biomass product; and (iii) a heating step comprising heating the molded biomass product at a temperature of 160°C to 420°C for a period of 0.25 to 5 hours to provide solid biomass fuel, and A process for producing solid biomass fuel, wherein one or more of the above biomass sources comprise (i) Calliandra calothyrsus, or (ii) a mixture of straw, chaff and coconut shells.
  2. In claim 1, One or more of the above biomass sources comprise the species Calliandra calothyrsus, optionally further comprising Acacia mangium, Albazia chinensis, Hivir brasiliensis, straw, chaff, or coconut shells; optionally, one or more of the above biomass sources comprise Calliandra calothyrsus, straw, chaff, and coconut shells, or are essentially composed of, or are composed of, a process for producing solid biomass fuel.
  3. In claim 1, A process for producing solid biomass fuel, wherein the step of heating the molded biomass product is performed for a period of 0.5 to 3 hours, and/or the step of heating the molded biomass product comprises heating the molded biomass product to a temperature of 180 ℃ to 350 ℃, optionally 210 ℃ to 280 ℃.
  4. In claim 1, A process for producing solid biomass fuel, wherein the step (ii) of molding the biomass powder includes a step of adapting the molding step so that the density of the molded biomass product is controlled, and optionally the step of adapting the molding step so that the density of the molded biomass product is controlled includes a step of controlling the compression ratio of the mold used in the molding step.
  5. In claim 1, A process for producing solid biomass fuel, wherein the step (iii) of heating the molded biomass product is configured to control the uniformity of the solid biomass fuel, and optionally the step (iii) of controlling the uniformity of the solid biomass product is performed in a device that rotates while the molded biomass product is being heated, and optionally the step (iii) of controlling the uniformity of the solid biomass product is configured to control the direction or speed of rotation of the solid biomass product, and optionally the molded biomass product is rotated in both counterclockwise and clockwise directions in the device.
  6. In claim 1, A process for producing solid biomass fuel, wherein the bulk density of the solid biomass fuel determined according to DIN EN 15103 is 0.6 kg/l to 0.8 kg/l and/or the mechanical durability of the solid biomass fuel determined according to DIN EN 15210-1 is 95% or more.
  7. In claim 1, (i) One or more of the above biomass sources comprise Caliandra callosyrsus, the bulk density of the solid biomass fuel is 0.64 kg/l to 0.66 kg/l, and the mechanical durability is 96% or more; (ii) One or more of the above biomass sources comprise a mixture of Callianthra callosyrsus, Acacia mangium, Albazia chinensis, and Hivir brasiliensis, and the bulk density of the solid biomass fuel is 0.67 kg/l to 0.69 kg/l, and the mechanical durability is 98% or more; (iii) One or more of the above biomass sources comprise a mixture of Caliandra callosyrsus, straw, rice husks, and coconut shells, wherein the bulk density of the solid biomass fuel is 0.61 kg/l to 0.63 kg/l and the mechanical durability is 95% or more; or (iv) One or more of the above biomass sources comprise a mixture of straw, rice husks and coconut shells, and the bulk density of the solid biomass fuel is 0.60 kg/l to 0.62 kg/l, and the mechanical durability is 95% or more; A process for producing solid biomass fuel, wherein the bulk density is determined according to DIN EN 15103 and the mechanical durability is determined according to DIN EN 15210-1.
  8. In claim 1, A process for producing solid biomass fuel, wherein (i) the total dry sulfur content of the biomass solid fuel is 0.05 wt% or less, and the total dry sulfur content is determined according to DIN EN 15289; (ii) the total dry hydrogen content of the biomass solid fuel is 5 wt% or more, and the total dry hydrogen content is determined according to DIN EN 15104; (iii) the total dry oxygen content of the biomass solid fuel is 34 wt% or more, and the total dry oxygen content is determined according to DIN EN 15296; (iv) the total dry carbon content of the biomass solid fuel is 50 wt% or more, and the total dry carbon content is determined according to DIN EN 15104; and/or (v) the total dry nitrogen content of the biomass solid fuel is less than 0.3 wt%, and the total dry nitrogen content is determined according to DIN EN 15104.
  9. In claim 1, The above solid biomass fuel is a solid biomass fuel production process that is waterproof for up to 20 days.
  10. In claim 1, A process for producing solid biomass fuel, wherein (i) when immersed in water, the chemical oxygen demand (COD) of the solid biomass fuel is 5000 ppm or less, and the chemical oxygen demand is determined according to GB/11914-89; (ii) the fixed carbon content of the solid biomass fuel is 25 wt% or more; (iii) the ash content of the solid biomass fuel is less than 5 wt%; and/or (iv) the volatile matter content of the solid biomass fuel is 60 wt% to 80 wt%.
  11. In claim 1, A production process for solid biomass fuel, wherein the moisture content of the solid biomass fuel is less than 5 wt%, and/or the calorific value of the solid biomass fuel is 5000 kcal/kg dry weight to 7000 kcal/kg dry weight.
  12. Solid biomass fuel obtained or obtainable according to the process of claim 1.
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  15. A combustion process comprising the step of burning a solid biomass fuel according to claim 12 to produce energy.
  16. In claim 15, The above solid biomass fuel is co-calcined and burned together with fossil fuel, wherein the PM1.0 emissions of the process are less than 175 mg/kg, a combustion process.
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Description

Solid biomass fuel production process The present invention relates to a process for producing solid biomass fuel and solid biomass fuel produced by said process. Additionally, the present invention relates to a combustion process comprising the step of burning said solid biomass fuel to produce energy. Coal-fired power generation is used in power plants and industrial processes worldwide. Coal and other fossil fuels are non-renewable energy resources. Over the past few decades, there have been calls to reduce coal consumption in coal-fired power plants and instead use renewable energy resources. Fuels derived from biomass are an example of a renewable energy source that can be used to replace, or at least partially replace, coal. Biomass-derived fuels can be burned in the presence of oxygen in a combustion process power plant to produce energy. Biomass-derived fuels can be burned in traditional power plants originally designed for coal combustion, or they can be burned in power plants specifically constructed for biomass combustion. Biomass in a certain form can be mixed with coal and burned in the same combustion process within a power plant. This process is known as coal co-firing of biomass. To be suitable for co-firing with coal, biomass-derived fuels typically possess homogeneity related to certain properties, such as a certain level of quality. For example, biomass fuels containing particles of homogeneous size, density, moisture content, etc., are particularly desirable in the co-firing process. Additionally, it is desirable for the biomass fuel to contain a low level of ash. The level of ash in biomass-derived fuels is typically higher than that found in coal. Various processes for producing solid biomass fuel from biomass sources are known. WO 2014/087949 discloses a process for producing solid biomass fuel in which a biomass source undergoes a steam explosion before being molded into a biomass block that is heated to form the biomass fuel. The objective of the process is to produce biomass fuel with reduced chemical oxygen demand (COD) in discharged water during storage and sufficient handling properties during storage. The biomass source used in the process is palm kernel shell. WO 2016/056608 is based on the teachings of WO 2014/087949 and discloses a process for producing solid biomass fuel that does not require a steam explosion step to produce the fuel. The process includes a molding step in which a biomass source is crushed before the biomass block is heated, molded into the biomass block, and compressed. The biomass source is wood such as Douglas fir, hemlock, cedar, cypress, red pine, almond tree, almond shell, acacia wood, acacia bark, walnut shell, sago palm, hollow fruit clusters, meranti, and gum. WO 2017/175733 discloses a similar process comprising a molding step in which a biomass source is crushed before being molded into and compressed into a biomass block, before the biomass block is heated. The process of WO 2017/175733 relates to providing a biomass fuel that achieves reduced COD in discharged water and exhibits low disintegration when exposed to rainwater. The biomass source used in the process is selected from rubber tree, acacia, meranti, eucalyptus, teak, and a mixture of larch, spruce, and birch. WO 2019/069849 aims to provide a biomass fuel that is resistant to spontaneous combustion during storage and is easy to transport and store. The biomass fuel is produced by a process comprising a molding step in which a biomass source is molded into a biomass block and crushed before being compressed, before the biomass block is heated. The biomass source for fuel production is selected from a mixture of rubber tree, acacia tree, radiator pine, larch, spruce, and birch; and spruce and fir. WO 2019/069860 describes an apparatus for producing biomass solid fuel. The apparatus comprises a carbonization furnace for carbonizing a molded biomass product to obtain biomass solid fuel. The apparatus further comprises a yield calculation unit, a temperature measurement unit, and a control unit. The control unit controls the heat applied to the carbonization furnace based on the natural combustion properties of the biomass fuel. The molded biomass product is formed by crushing a biomass source into pellets before molding the pellets into the molded biomass product. The biomass source is selected from a mixture of rubber tree, acacia, diphterocarp, radian pine, larch, spruce, and birch, or a mixture of spruce, pine, and fir. WO 2018/181919 describes a process different from the one described above for producing solid biomass fuel. The process includes a hydrothermal carbonization step of biomass in which a biomass source is pressurized in hot water to carbonize the biomass. The process is reported to provide biomass fuel with high pulverability with high yield and reduced manufacturing costs. The biomass source is selected from husks, coconut shells, coconut trees, bamboo, hollow fruit clust