1廢氣成分

1. Composition of exhaust gas

沸石是一種混合物，其成分不同，能夠吸附的VOCs組分也有所差異。因此，在選擇轉(zhuǎn)輪時(shí)，需明確廢氣的主要成分、含量、濃度、風(fēng)量等參數(shù)，以便選擇更加合適的沸石材料，達(dá)到處理VOCs的目的。

Zeolite is a mixture with different components, and the components of VOCs that can be adsorbed also vary. Therefore, when selecting the impeller, it is necessary to clarify the main components, content, concentration, air volume and other parameters of the exhaust gas in order to select more suitable zeolite materials and achieve the goal of treating VOCs.

廢氣成分比較單一或者成分特性比較接近時(shí)，選用一級(jí)轉(zhuǎn)輪就能夠達(dá)到目的。但是，如果廢氣成分比較復(fù)雜，一級(jí)轉(zhuǎn)輪不能一次性處理的話，可以考慮使用兩級(jí)轉(zhuǎn)輪來(lái)處理，兩級(jí)轉(zhuǎn)輪可針對(duì)不同組分進(jìn)行處理，能有效提高處理效率。

When the composition of exhaust gas is relatively single or the composition characteristics are similar, selecting a first stage impeller can achieve the goal. However, if the composition of the exhaust gas is complex and the first stage impeller cannot be used for one-time treatment, it can be considered to use a two-stage impeller for treatment. The two-stage impeller can be used to treat different components, which can effectively improve treatment efficiency.

當(dāng)廢氣中含有沸點(diǎn)高的VOCs時(shí)，如果脫附熱量不足，吸附劑沒有完全脫附，會(huì)使吸附劑在吸附區(qū)堆積。隨著時(shí)間的推移，會(huì)發(fā)生聚合反應(yīng)，進(jìn)而堵塞沸石的吸附位置，導(dǎo)致這一區(qū)域的吸附效率降低。

When the exhaust gas contains VOCs with high boiling points, if the desorption heat is insufficient and the adsorbent is not completely desorbed, it will cause the adsorbent to accumulate in the adsorption zone. Over time, polymerization reactions will occur, leading to blockage of the adsorption site of zeolite and a decrease in adsorption efficiency in this area.

為了使吸附在沸石中的高沸點(diǎn)VOCs完全脫附，避免造成高沸點(diǎn)VOCs的解吸困難，在進(jìn)入吸附輪前要用濾布或活性炭對(duì)廢氣進(jìn)行過(guò)濾，添加除霧器或冷凝器，先將高沸點(diǎn)VOCs去除。

In order to completely desorb high boiling VOCs adsorbed in zeolite and avoid difficulties in desorbing high boiling VOCs, filter the exhaust gas with filter cloth or activated carbon before entering the adsorption wheel, add a defogger or condenser, and first remove the high boiling VOCs.

2廢氣冷卻

2. Exhaust gas cooling

沸石的特性是在溫度較低時(shí)具有良好的吸附性能，溫度較高時(shí)呈現(xiàn)脫附性能。因此，為了使廢氣通過(guò)轉(zhuǎn)輪的沸石模塊時(shí)能被大量快速吸附，一般要求廢氣的溫度低于40℃，印刷等行業(yè)普遍能夠滿足這一要求。

The characteristic of zeolite is that it has strong adsorption performance at low temperatures and exhibits desorption performance at high temperatures. Therefore, in order to allow the exhaust gas to be quickly adsorbed in large quantities through the zeolite module of the impeller, it is generally required that the temperature of the exhaust gas be below 40 ℃, which is generally met by industries such as printing.

但是，個(gè)別企業(yè)的廢氣溫度較高，會(huì)導(dǎo)致沸石模塊的吸附處理效率不高。為了解決這一問(wèn)題，需要在前段增加降溫措施。

However, some companies have high exhaust gas temperatures, which can lead to low adsorption efficiency of zeolite modules. To address this issue, it is necessary to add cooling measures in the early stages.

降溫裝置設(shè)有冷卻塔、表冷器、循環(huán)水泵、閥門組件、閥組過(guò)濾器、管路、儀器儀表及溫控系統(tǒng)。在廢氣溫度高于35℃時(shí)，系統(tǒng)自動(dòng)啟動(dòng)循環(huán)冷卻系統(tǒng)。

The cooling device is equipped with a cooling tower, surface cooler, circulating water pump, valve components, valve group filters, pipelines, instruments and temperature control system. When the exhaust gas temperature exceeds 35 ℃, the system automatically starts the circulating cooling system.

實(shí)際應(yīng)用中會(huì)在過(guò)濾裝置后端增加循環(huán)冷卻水對(duì)廢氣進(jìn)行間接式降溫，使進(jìn)入沸石轉(zhuǎn)輪的廢氣溫度保持在35℃，沸石轉(zhuǎn)輪的吸附效率達(dá)到穩(wěn)定。

In practical applications, circulating cooling water will be added at the back end of the filtration device to indirectly cool the exhaust gas, keeping the temperature of the exhaust gas entering the zeolite wheel at 35 ℃, and achieving stable adsorption efficiency of the zeolite wheel.

3廢氣的前處理

3. Pre treatment of exhaust gas

沸石轉(zhuǎn)輪的模塊被制成多層結(jié)構(gòu)，具有一定尺寸的孔道，廢氣通過(guò)時(shí)進(jìn)行吸附，如果孔道堵塞，則無(wú)法吸附。為了保護(hù)沸石轉(zhuǎn)輪的吸附性能，廢氣進(jìn)入沸石轉(zhuǎn)輪之前需進(jìn)行預(yù)處理，使進(jìn)入轉(zhuǎn)輪濃縮系統(tǒng)的塵埃粒子得到有效去除。

The module of the zeolite wheel is made into a multi-layer structure (as shown in the figure below), with a certain size of pores. When the exhaust gas passes through, it is adsorbed. If the pores are blocked, it cannot be adsorbed. In order to protect the adsorption performance of the zeolite wheel, pre-treatment is required before the exhaust gas enters the zeolite wheel to effectively remove the dust particles entering the wheel concentration system.