Sodium bicarbonate is among the alkali chemicals used for dry scrubbing in incineration flue gas treatment. It is generally pulverized into fine particles of ~ 20 µm to increase the specific surface area for higher reaction efficiency with acid gases. However, problems such as bridging or blocking in the storage and supply system can easily occur with pulverized sodium bicarbonate (PSB). Pulverization with the addition of a dispersing agent is performed as a measure that leads to an increase in chemical cost. In this paper, vacuum thermal treatment was examined to produce porous sodium carbonate from coarse sodium bicarbonate (CSB). Pressure, temperature, and heating time were tested to produce sodium carbonate with a specific surface area that is equal to or higher than that of the sodium carbonate (REF) obtained from PSB by spraying it into a fabric filter at 180 °C. Sodium carbonate (P30) with a higher specific surface area than REF was obtained by treating CSB at 180 °C under 30 kPa for 1 h. P30 was proven to have 1.8 times higher HCl removal efficiency than REF. This novel method is expected to resolve the existing issues through both spraying PSB and reducing the air resistance at the fabric filters.

碳酸氢钠是用于焚烧烟气处理中的干法洗涤的碱性化学品之一。通常将其粉碎成〜20 µm的细颗粒，以增加比表面积，从而提高与酸性气体的反应效率。但是，粉状的碳酸氢钠（PSB）会很容易出现诸如在存储和供应系统中桥接或阻塞的问题。添加分散剂的粉化作为导致化学成本增加的措施来进行。本文研究了真空热处理从粗碳酸氢钠（CSB）生产多孔碳酸钠的方法。压力，温度 通过在180°C下将其喷洒到织物过滤器中，测试了碳酸钠和加热时间，以生产比表面积等于或高于从PSB获得的碳酸钠（REF）的碳酸钠。通过在180°C下在30 kPa下将CSB处理1 h，可以得到比表面积比REF高的碳酸钠（P30）。事实证明，P30的HCl去除效率是REF的1.8倍。有望通过喷涂PSB和减少织物过滤器的空气阻力来解决现有问题。