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      Lignite-to-coke technology

      With economic growth, environmental protection is receiving more and more attention, particularly in coal-rich, water-short, environmentally fragile Inner Mongolia and northwestern China where environmental requirements are stricter. Given that the traditional wet desulfurization process is restricted by its large land occupation and high dependence on water resource, the dry flue gas purification technology featuring small land occupation, water efficiency and environmental protection becomes more promising. Countries are actively involved in research of dry desulfurization technology and moving it toward equipment scale-up, system simplification and control automation. SPC has developed the lignite-to-AC technology in order to promote the application of the dry flue gas desulfurization and integrated purification technology, cut its operating cost, create specialist, large-scale production advantage and sharpen SPC's competitive edge in the area of dry flue gas desulfurization and integrated purification.

      I. Advantages of lignite-to-coke process

      (1) With high volatile components, lignite is favorable to creation of porous adsorbent.

      (2) With high oxygen content and low hydrogen content, lignite is favorable to formation of pore structure and increase in alkaline content.

      (3) With low degree of coalification and high reactivity, lignite is helpful to formation of pore structure for catalyst sedimentation.

      (4) Lignite is inexpensive as raw material for preparing AC.

      (5) Lignite is readily available at low costs.

      II. Lignite-to-AC process flow

      Lignite upgrading: high-moisture lignite with moderate ash content is subjected to thermal drying or low temperature carbonization to remove the majority of moisture and some volatile components from the lignite, obtaining upgraded coal for later use.

      Pulverization: pulverize the upgraded coal to certain fineness for later use.
      Kneading and shaping: mix pulverized coal with hot coal tar, water and a small amount of additive, knead the mixture into suitable coal paste, and shape the paste by machine into column-shaped carbon bar.
      Seasoning and drying: season and dry the shaped carbon bar as needed, gradually hardening its surface and remove moisture.
      Carbonization: carbonize the dried or seasoned carbon bars, making them carbonized particles with suitable lengths and certain characteristics.
      Activation: using a mixture of superheated steam and activated tail gas activate the carbonized particles at high temperatures to make activated material; cool and screen the activated material to obtain eligible AC for FGD.
      III. Technical features of SPC lignite-to-coke technology
      1. SPC lignite-to-AC technology cuts AC production cost by at least 20% relative to similar commercially available AC products, by using low-cost lignite from Inner Mongolia (rather than costly anthracite and bituminous coal) as main raw material and hot coal tar as bonder.
      2. The technology offers a complete formula and process of making large AC grains for desulfurization out of lignite using hot coal tar as bonder without adding coal. The AC prepared by this technology has ideal average performance indicators, including good adsorption, high abrasive resistance, high resistance to oxidation, high ignition point and high

      3. After nearly three years of independent development of lignite-to-coke formula and process, SPC has made technical achievements in this respect. SPC has applied for national patents for invention for its lignite-to-coke technology.

      Relevant patent applications are listed below:

      Patent name
      Patent application number
      Patent type
      Coal-based activated coke for desulfurization and its preparation method
      nventive patent
      Lignite-based activated coke for FGD and its preparation method
      nventive patent
      Lignite-based small-grained activated coke and its preparation method
      nventive patent

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