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Introduction
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        The 75t/h combined grate fired high-temperature and high-pressure steam boiler applies advanced biomass combustion technology with our own intellectual property rights. The boiler is of natural circulation, single drum, single furnace, balance draft, outdoor arrangement, solid deslagging, overall steel structure; bottom supported and top hanging structure.
        The boiler designs for firing the all kinds of corps straw, specially blended with wood chips, sticks etc. Such biomass fuel contains various saline matters including chloride, and the flue gas has very corrosive characteristics. In addition, the ash fusion point of the combustion products is low, and the ash is easy to stick on the heating surface tubes and form the slag, thus the transfer coefficient of heating surface is reduced. Therefore, special material, structure, and efficient ash cleaning measures are applied for the tubes in high temperature section to avoid corrosion and slagging.

         The boiler applies the combined grate combustion system. Steam and water of the boiler system applied the natural circulation, and downcomers are arranged outside the furnace. The boiler is “M” type, the furnace and superheater pass apply overall membrane wall, which guarantee the sealing of the boiler. The superheated steam is heated in four stages, and desuperheated by three stages of the spray water, thus the superheated steam has enough control allowance to guarantee the boiler steam parameters. Three stages of economizers, primary and secondary of air preheater are aggranged in the back of superheater. The boiler can be ignited by handy firewood. The interface of the strarup burner is prepared in advance on the side furnace wall to guarantee to improve the reliability of the ignition. The boiler is of outdoor arrangement, the operation level is EL8.0m, the structure over the operation level is steel and the boiler designed as per 7 degrees of earthquake intensity.

        According to steam pressure, it has three types of 9.8MPa, 5.29Mpa and 3.82Mpa.

 

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