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The invention belongs to the technical field of biomass charcoal materials, and particularly relates to a lignin porous carbon nanosheet as well as a preparation method thereof and an application in asupercapacitor electrode material. The preparation method comprises the following steps: self-assembling lignosulfonate and oxalate in a selective solvent layer by layer to obtain layer-by-layer self-assembled lignin / oxalate compound, and carbonizing and acid pickling the compound to obtain the lignin porous carbon nanosheet. The specific surface area range of the lignin porous carbon nanosheet prepared by virtue of the method provided in the invention is 200 to 1500 m2 / g, the microporous specific surface area range is 100 to 500 m2 / g, the mesoporous specific surface area range is 100 to 1000m2 / g, the aperture is 0.5 to 30 micrometers, and the pore volume is 0.5 to 1.5 cm3 / g; and the lignin porous carbon nanosheet can be applied to the supercapacitor electrode material, has higher specific capacity and excellent multiplying power performance (the specific capacity maintaining rate is 76.6 percent), and has good potential application value.

The invention relates to a biomass sawdust fuel burning furnace, comprising a chassis frame, an incinerator, a spitfire mechanism, a fuel supply mechanism, a fuel supply box, a power transmission mechanism and an oxygen supply mechanism, wherein the chassis frame is arranged on floor; the incinerator is fixed at one end of the chassis frame, the outer wall of the incinerator constitutes a jacket and is provided with a feeding hole and a combustion-supporting air introduction mechanism, and a cover is arranged on the top of the incinerator in a matching manner; the spitfire mechanism is connected with the upper side part of the incinerator in a matching manner; the fuel supply mechanism is arranged on the other end of the chassis frame, and comprises a pair of guide rails, a moving frame, a screw rod cylinder and an extrusion screw rod; the fuel supply box is arranged on the fuel supply mechanism; the power transmission mechanism is arranged on the other end of the chassis frame; and the oxygen supply mechanism is arranged on the other end of a stand. The biomass sawdust fuel burning furnace disclosed by the invention has the advantages of high combustion efficiency, large heating quantity, low ignition point and high heating property, is friendly to the environment, good for protecting non-renewable natural resources such as petroleum and coal to embody the circular sustainable development of economy, concise in structure and convenient and safe to use; and a combustion effect can be guaranteed by introducing dense biomass sawdust into a hearth.

The invention discloses a modified wood fibre phase change energy storage material and a preparation method thereof. According to the modified wood fibre phase change energy storage material and the preparation method thereof, the pore diameters of wood fibres can be adjusted and controlled effectively, besides, porous structures of the wood fibres are improved, and the compatibility of the wood fibres and a phase change material is improved. The modified wood fibres are taken as a loading matrix of the phase change energy storage material; more phase change materials can be remained through the actions of hydrogen bonds, capillary force, intermolecular force and the like of the modified wood fibres, so that the enthalpy of phase change is improved; the modified wood fibres are combined with a fatty acid eutectic mixture, so that the requirement on low-temperature energy storage can be met; moreover, the phase change material prepared by the preparation method is degraded without heatin a phase change temperature range, which shows that the thermal stability of the modified wood fibre phase change energy storage material is high; and after 100 times of thermal cycle, the phase change material does not leak, which shows that the thermal reliability is high, and the thermal energy storage efficiency is high. The preparation method disclosed by the invention is simple in process;the wood fibres serving as the raw material are wide in source and low in cost; the raw materials do not need to be subjected to chemical treatment, and are environment-friendly and energy-saving, and the modified wood fibre phase change energy storage material has a wide application prospect in the field of solar energy utilization, building energy conservation and the like.

The invention discloses a preparation method and applications of a biochar composite photocatalytic material, and belongs to the field of environmental functional materials. In the prior art, BiVO4 isa good photocatalytic material, and the affinity of BiVO4 to organic pollutants is not strong, such that the efficient degradation of organic pollutants is not easily achieved. According to the present invention, biochar is doped during the preparation of BiVO4, the biochar-BiVO4 composite material is prepared in the high pressure reaction kettle under the alkaline condition, rhodamine B is addedto the customized visible light reactor, and mass transfer is performed under the deuterium lamp light source by using the composite material as the catalyst; the results show that the composite photocatalytic material has the improved visible light absorption and can enhance the adsorption on organic pollutants by the catalytic material after the biochar is doped; and the composite material canimprove the adsorption on organic pollutants by the photocatalytic material and increase the utilization on visible light by the photocatalytic material so as to improve the photocatalytic degradationefficiency of the BiVO4 material on organic pollutants.

The invention relates to a building foundation type sandy soil heat storage self-heating system which comprises a building foundation, an enclosing wall and a foundation type sandy soil heat storage self-heating system. The foundation type sandy soil heat storage self-heating system comprises a foundation type sandy soil heat storage device, a hot air duct, a cold air duct, a hot air louver and a cold air louver; the foundation type sandy soil heat storage device comprises a heat storage body, a heat exchange pipe buried in the heat storage body and air diffusers at both ends of the heat exchange pipe. The building foundation type sandy soil heat storage self-heating system has the characteristics of low heat storage cost, large heat storage capacity, high heat exchange efficiency, no energy consumption in the heating process, good performance of regulating and controlling heating power and the like. The system has the advantages of simple structure, safety, reliability, high stability, wide adaptability and the like and is a very ideal sandy soil heat storage self-heating system which is used for a single-layer or multilayer building in the northern area to utilize new energy, such as wind energy, solar energy and the like, to carry out heating.

The invention provides a method for preparing a continuous alumina-based ceramic fiber, which relates to an alumina-based ceramic fiber, in particular to a method for preparing a continuous alumina-based ceramic fiber which takes alumina as a main component and adds a second component as a crystalling phase inhibitor. The invention provides a method for preparing the continuous alumina-based ceramic fiber, which is simple in technique and low in cost. The method comprises the steps: preparing alumina sol; preparing silicon dioxide sol; mixing the alumina sol and the silicon dioxide sol to obtain biphase sol, and adding a spinning addition agent into the biphase sol; condensing the biphase sol added with the addition agent and spinning by a dry method to obtain the gel fiber; pyrolyzing the gel fiber to obtain the ceramic fiber; and sintering the ceramic fiber to obtain the continuous alumina-based ceramic fiber.