1废气成分

1. Composition of exhaust gas

沸石是一种混合物，其成分不同，能够吸附的VOCs组分也有所差异。因此，在选择转轮时，需明确废气的主要成分、含量、浓度、风量等参数，以便选择更加合适的沸石材料，达到处理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.

废气成分比较单一或者成分特性比较接近时，选用一级转轮就能够达到目的。但是，如果废气成分比较复杂，一级转轮不能一次性处理的话，可以考虑使用两级转轮来处理，两级转轮可针对不同组分进行处理，能有效提高处理效率。

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.

当废气中含有沸点高的VOCs时，如果脱附热量不足，吸附剂没有完全脱附，会使吸附剂在吸附区堆积。随着时间的推移，会发生聚合反应，进而堵塞沸石的吸附位置，导致这一区域的吸附效率降低。

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.

为了使吸附在沸石中的高沸点VOCs完全脱附，避免造成高沸点VOCs的解吸困难，在进入吸附轮前要用滤布或活性炭对废气进行过滤，添加除雾器或冷凝器，先将高沸点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废气冷却

2. Exhaust gas cooling

沸石的特性是在温度较低时具有很强的吸附性能，温度较高时呈现脱附性能。因此，为了使废气通过转轮的沸石模块时能被大量快速吸附，一般要求废气的温度低于40℃，印刷等行业普遍能够满足这一要求。

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，个别企业的废气温度较高，会导致沸石模块的吸附处理效率不高。为了解决这一问题，需要在前段增加降温措施。

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.

降温装置设有冷却塔、表冷器、循环水泵、阀门组件、阀组过滤器、管路、仪器仪表及温控系统。在废气温度高于35℃时，系统自动启动循环冷却系统。

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.

实际应用中会在过滤装置后端增加循环冷却水对废气进行间接式降温，使进入沸石转轮的废气温度保持在35℃，沸石转轮的吸附效率达到稳定。

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废气的前处理

3. Pre treatment of exhaust gas

沸石转轮的模块被制成多层结构，具有一定尺寸的孔道，废气通过时进行吸附，如果孔道堵塞，则无法吸附。为了保护沸石转轮的吸附性能，废气进入沸石转轮之前需进行预处理，使进入转轮浓缩系统的尘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.