沸石轉(zhuǎn)輪吸附濃縮和活性炭吸附濃縮已成為VOC有機(jī)廢氣處理市場(chǎng)的兩大主流處理工藝。但活性炭吸附凈化效率迅速下降，易著火，沸石轉(zhuǎn)輪逐漸被國(guó)內(nèi)業(yè)主接受。
Zeolite wheel adsorption concentration and activated carbon adsorption concentration have become two mainstream treatment processes in the VOC organic waste gas treatment market. However, the efficiency of activated carbon adsorption and purification has rapidly decreased, making it prone to ignition. The zeolite runner has gradually been accepted by domestic owners.
我們發(fā)現(xiàn)，在沸石轉(zhuǎn)輪的技術(shù)交流中，業(yè)主廢氣的相對(duì)濕度通常會(huì)被調(diào)查，因?yàn)榉惺D(zhuǎn)輪公司在選擇沸石轉(zhuǎn)輪時(shí)通常需要客戶提供廢氣的相對(duì)濕度。由于相對(duì)濕度超過(guò)80%，沸石轉(zhuǎn)輪的凈化效率將大大降低。因此，如果廢氣的相對(duì)濕度超過(guò)80%RH，則需要增加濕度調(diào)節(jié)單元。
We found that in the technical exchange of zeolite wheels, the relative humidity of the owner's exhaust gas is usually investigated, because zeolite wheel companies usually require customers to provide the relative humidity of the exhaust gas when selecting zeolite wheels. Due to relative humidity exceeding 80%, the purification efficiency of the zeolite runner will be greatly reduced. Therefore, if the relative humidity of the exhaust gas exceeds 80% RH, it is necessary to add a humidity regulating unit.
那么，活性炭對(duì)廢氣的相對(duì)濕度有要求嗎有，而且相對(duì)濕度要求低于沸石轉(zhuǎn)輪，活性炭對(duì)廢氣的相對(duì)濕度要求為60%。目前，活性炭吸附脫附設(shè)備中幾乎沒(méi)有濕度調(diào)節(jié)單元。
So, does activated carbon have a requirement for the relative humidity of exhaust gas, and the requirement for relative humidity is lower than that of zeolite wheels. Activated carbon requires a relative humidity of 60% for exhaust gas. At present, there are almost no humidity adjustment units in activated carbon adsorption and desorption equipment.
常用的沸石分子篩是由Si/O和Al/O四面體結(jié)構(gòu)單元組成的合成不溶性鋁硅酸鹽。其中，硅原子或鋁原子構(gòu)成四面體的中心。所有硅氧四面體和鋁氧四面體通過(guò)共享頂點(diǎn)的氧原子連接成多個(gè)環(huán)，多個(gè)環(huán)相互連接形成立體骨架。這種鋁硅酸鹽中的硅氧比為1:2，符合簡(jiǎn)單的SiO2。由于網(wǎng)格框架中的Al3+離子取代了Si4+離子，網(wǎng)格框架具有負(fù)電荷。為了平衡Al/O四面體的負(fù)電荷，網(wǎng)格框架間隙中需要有補(bǔ)償電荷的陽(yáng)離子。
The commonly used zeolite molecular sieve is a synthetic insoluble aluminosilicate composed of Si/O and Al/O tetrahedral structural units. Among them, silicon or aluminum atoms form the center of the tetrahedron. All silicon oxygen tetrahedra and aluminum oxygen tetrahedra are connected into multiple rings through oxygen atoms sharing vertices, and the multiple rings are interconnected to form a three-dimensional skeleton. The silicon to oxygen ratio in this aluminum silicate is 1:2, which conforms to the simple SiO2. Due to the substitution of Si4+ions by Al3+ions in the grid framework, the grid framework has negative charges. In order to balance the negative charge of Al/O tetrahedra, cations with compensating charges are needed in the gap of the grid frame.
這些陽(yáng)離子成為極性點(diǎn)，使沸石分子篩具有親水性。合成沸石轉(zhuǎn)輪的吸濕能力強(qiáng)于硅膠，每升空氣中的水分可低于10-4mg。因此，為了提高沸石分子篩的疏水性，有必要消除極性離子，即降低結(jié)晶中的鋁含量，使沸石轉(zhuǎn)骨架中沒(méi)有硅和氧原子。硅和氧原子之間的鍵距為1.6，離子半徑為0.40和1.40，因此吸附微孔被氧原子包圍。Si-O-Si鍵中的氧原子既不堿性也不形成氫鍵。因此，微孔表面無(wú)極，疏水。
These cations become polar points, making the zeolite molecular sieve hydrophilic. The moisture absorption capacity of synthetic zeolite wheels is stronger than that of silica gel, and the moisture content in each liter of air can be less than 10-4mg. Therefore, in order to improve the hydrophobicity of zeolite molecular sieves, it is necessary to eliminate polar ions, that is, reduce the aluminum content in the crystallization, so that there are no silicon and oxygen atoms in the zeolite skeleton. The bond distance between silicon and oxygen atoms is 1.6, and the ion radii are 0.40 and 1.40, so the adsorption micropores are surrounded by oxygen atoms. The oxygen atoms in the Si O-Si bond are neither alkaline nor form hydrogen bonds. Therefore, the surface of micropores is polar and hydrophobic.
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