The boss of the biological desulfurization manufacturer tells you what is chemical desulfurization

在这种方法中，化学物质（有机溶液或无机溶液）渗入煤基材的硫发生化学变化，产生可溶性硫化合物，从而达到脱硫的目的。根据所用药物特性的不同，这种方法不仅可以去除有机硫，还可以去除无机硫。如果控制条件得当，脱硫效率会更高。化学脱硫法可以去除物理脱硫法无法去除的硫，因此化学脱硫法特别适用于有机硫含量高的煤的脱硫。

In this method, chemical substances (organic solution or inorganic solution) infiltrate into the sulfur of the coal substrate to produce soluble sulfur compounds, so as to achieve the purpose of desulfurization. According to the different characteristics of the drugs used, this method can not only remove organic sulfur, but also remove inorganic sulfur. If the control conditions are appropriate, the desulfurization efficiency will be higher. The chemical desulfurization method can remove the sulfur that cannot be removed by the physical desulfurization method, so the chemical desulfurization method is especially suitable for the desulfurization of coal with high organic sulfur content.

但需要注意的是，脱硫药物在发生脱硫反应的同时，破坏了精煤的有机结构，甚至药物支付与无硫结构部分发生反应，导致精煤属性发生变化。对于炼焦煤来说，这种煤的结构变化会导致附着力和结焦性下降。大多数无机脱硫药物都含有Na，K脱硫后，离子的碱溶液不可避免地会附着在煤的一些孔隙中。煤炼成焦炭后，离子在高炉中对碳溶性反应(CCO2=2CO-Q)催化反应明显。因此，炼铁煤脱硫不宜轻易选用化学脱硫。

However, it should be noted that the desulfurization drug destroys the organic structure of the cleaned coal while the desulfurization reaction occurs, and even the drug payment reacts with the sulfur-free structure, resulting in changes in the properties of the cleaned coal. For coking coal, the structural change of such coal will lead to the decrease of adhesion and coking. Most inorganic desulfurizing drugs contain Na and K. After desulfurizing, the alkali solution of ions will inevitably adhere to some pores of coal. After coal is converted into coke, the ion catalyzes the carbon solubility reaction (CCO2=2CO-Q) in the blast furnace. Therefore, chemical desulfurization should not be easily selected for ironmaking coal desulfurization.

近年来，氢脱硫等方法得到了研究和开发。煤受热时，其不稳定的含硫结构部分自行分解产生硫化氢。同时，煤活性自由基获得氢，可提高煤的附着力。该方法的脱硫效率可达95%。因此，氢脱硫法特别适用于有机含硫量高的炼铁煤脱硫。

In recent years, hydrogen desulfurization and other methods have been studied and developed. When coal is heated, its unstable sulfur-containing structure partially decomposes to produce hydrogen sulfide. At the same time, the active free radical of coal can obtain hydrogen, which can improve the adhesion of coal. The desulfurization efficiency of this method can reach 95%. Therefore, hydrogen desulfurization method is particularly suitable for desulfurization of ironmaking coal with high organic sulfur content.

化学粉碎方法是选择药物（氨）渗入煤，可剥离黄铁矿与有机质的界面，然后通过物理方法分离部分黄铁矿，显然脱硫效率远高于一般物理脱硫方法，几乎不改变精煤的特点，低于加氢脱硫成本，也适用于炼铁煤脱硫的发展潜力。

The chemical crushing method is to select drugs (ammonia) to penetrate into the coal, which can peel off the interface between pyrite and organic matter, and then separate part of pyrite through physical methods. Obviously, the desulfurization efficiency is much higher than the general physical desulfurization method, which hardly changes the characteristics of clean coal and is lower than the cost of hydrodesulfurization. It is also applicable to the development potential of ironmaking coal desulfurization.

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