Abstract: An inflatable active packer includes: an inner steel pile; and a sleeve coaxially disposed outside the inner steel pile. The inner diameter of the sleeve is larger than the outer diameter of the inner steel pile. The length of the sleeve is less than or equal to the length of the inner steel pile. The sleeve includes an inner wall, and one end of the inner wall is provided with a guide lug. A strengthened clamping layer is attached to the inner wall of the sleeve. A rubber capsule is fixedly disposed in the middle of the strengthened clamping layer; two ends of the strengthened clamping layer are fixedly connected to the sleeve through a compression member. A mounting hole is disposed in the middle of the strengthened clamping layer. The sleeve includes a through hole coaxially with the mounting hole.

Abstract: The present invention provides a refrigerating and freezing device, including a cabinet and a door body provided on the cabinet for opening or closing the cabinet, wherein the door body includes a first door body and a second door body spaced apart from each other. In a closed state, the first door body and the second door body are located on the same plane. The first door body is provided with a sound generating device on a side facing the second door body, and the direction of the sound emitted by the sound generating device faces the second door body. A gap serving as a sound mixing chamber is formed between the first door body and the second door body. Therefore, the sound emitted by the sound generating device can be reflected back and forth in the sound mixing chamber, thereby making the sound more pleasant and vigorous.

Abstract: Process for direct coal liquefaction of coal, including: (1) preparing a coal slurry from raw coal; (2) preheating the coal slurry, then feeding it into reaction system to undergo liquefaction reaction; (3) separating reaction products in a separator to form a liquid phase and a gas phase, wherein the liquid phase is fractionated in an atmospheric tower into a light oil fraction and a bottom product; (4) feeding the atmospheric tower bottom product to a vacuum tower to separate into distillate and vacuum residue; (5) mixing the light oil fraction and the distillate to form a mixture, then feeding the mixture to a suspended bed hydrotreating reactor with forced circulation for hydrogenation; (6) fractionating hydrogenation products into oil products and a hydrogen donor recycling solvent. The process can operate long periods, with higher reactor efficiency and utilization factor, increased liquid oil yield and can supply high-quality feedstock for further processing.

Abstract: Process for direct coal liquefaction of coal, including: (1) preparing a coal slurry from raw coal; (2) preheating the coal slurry, then feeding it into reaction system to undergo liquefaction reaction; (3) separating reaction products in a separator to form a liquid phase and a gas phase, wherein the liquid phase is fractionated in an atmospheric tower into a light oil fraction and a bottom product; (4) feeding the atmospheric tower bottom product to a vacuum tower to separate into distillate and vacuum residue; (5) mixing the light oil fraction and the distillate to form a mixture, then feeding the mixture to a suspended bed hydrotreating reactor with forced circulation for hydrogenation; (6) fractionating hydrogenation products into oil products and a hydrogen donor recycling solvent. The process can operate long periods, with higher reactor efficiency and utilization factor, increased liquid oil yield and can supply high-quality feedstock for further processing.

Abstract: Process for direct coal liquefaction of coal, including: (1) preparing a coal slurry from raw coal; (2) preheating the coal slurry, then feeding it into reaction system to undergo liquefaction reaction; (3) separating reaction products in a separator to form a liquid phase and a gas phase, wherein the liquid phase is fractionated in an atmospheric tower into a light oil fraction and a bottom product; (4) feeding the atmospheric tower bottom product to a vacuum tower to separate into distillate and vacuum residue; (5) mixing the light oil fraction and the distillate to form a mixture, then feeding the mixture to a suspended bed hydrotreating reactor with forced circulation for hydrogenation; (6) fractionating hydrogenation products into oil products and a hydrogen donor recycling solvent. The process can operate long periods, with higher reactor efficiency and utilization factor, increased liquid oil yield and can supply high-quality feedstock for further processing.