沸石转轮主要将大风量、低浓度的废气浓缩到高浓度、小风量的废气，从而减少设备的投入费用和运行成本，提高VOCs废气的处理效率。利用热氧化技术在处理大风量、低浓度的废气的时候，如果没有沸石转轮直接进行燃烧，废气处理设备不仅体积庞大，而且产生的运行费用也很高昂。那么沸石转轮在处理VOCs时有哪些注意事项呢？

The zeolite wheel mainly concentrates high air volume and low concentration waste gas to high concentration and low air volume waste gas, thereby reducing equipment investment and operating costs, and improving the treatment efficiency of VOCs waste gas. When using thermal oxidation technology to treat high air volume and low concentration waste gas, if there is no zeolite wheel for direct combustion, the waste gas treatment equipment not only has a large volume, but also incurs high operating costs. So what are the precautions for zeolite wheels when dealing with VOCs?

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，达到有效吸附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 effective adsorption of 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℃，印刷等典型工业行业普遍能够满足这一要求。但是，个别行业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。为解决这一问题，需要在前段增加降温措施。

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 typical industrial industries such as printing. However, the high exhaust gas temperature of some industry enterprises 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废气预处理

3. Waste gas pretreatment

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.

图1 沸石模块

Figure 1 Zeolite Module

一般在前段至少设置一级过滤，可以根据实际工况选择过滤等级，有必要的话可以多加几级过滤。如果前段有冷却系统的话，有必要增加一级除湿装置。常见的过滤形式组合有F5+F9两级过滤、DPA+F5+F7+F9四级过滤等方式。过滤器一般采用袋式过滤器，不同等级的过滤器为模块化设计，安装方便。

Generally, at least one level of filtration is set in the front section, and the filtration level can be selected according to the actual working conditions. If necessary, multiple levels of filtration can be added. If there is a cooling system in the front section, it is necessary to add a primary dehumidification device. The common combination of filtration forms includes F5+F9 two-stage filtration, DPA+F5+F7+F9 four stage filtration, and so on. Filters generally use bag filters, and filters of different grades are designed in a modular manner for easy installation.

控制系统中，在每层过滤器前后安装在线压差传感器，可以根据不同等级的过滤袋设置相应的压差报警值，当过滤系统的压差达到设定的报警值，控制系统发出报警信号，起到提示作用。这也是控制系统的一大特色。

In the control system, online pressure differential sensors are installed before and after each layer of filters, and corresponding pressure differential alarm values can be set according to different levels of filter bags. When the pressure differential of the filtering system reaches the set alarm value, the control system sends an alarm signal to provide a prompt. This is also a major feature of the control system.

通过除尘、除湿处理之后的废气更加“干净”，有助于延长沸石模块的寿命。过滤后的废气进入沸石转轮后，转轮以较低的速度连续转动，废气由吸附风机吹入转轮吸附区，处理后的洁净气排入大气，当转轮吸附后转到脱附区，少量洁净气与RTO燃烧室高温气进行热交换后加热为热气（180℃—200℃），使被吸附的VOCs脱附再生，而脱附下来的高浓度废气进入旋转式RTO进行中高温氧化。

After dust removal and dehumidification treatment, the exhaust gas becomes cleaner, which helps to extend the lifespan of the zeolite module. After the filtered exhaust gas enters the zeolite impeller, the impeller rotates continuously at a lower speed. The exhaust gas is blown into the impeller adsorption area by the adsorption fan, and the treated clean gas is discharged into the atmosphere. When the impeller adsorbs, it is transferred to the desorption area. A small amount of clean gas exchanges heat with the high-temperature gas in the RTO combustion chamber and is heated into hot gas (180 ℃ -200 ℃), allowing the adsorbed VOCs to desorb and regenerate, The high concentration waste gas desorbed enters the rotary RTO for medium to high temperature oxidation.

4废气脱附

4. Waste gas desorption

沸石模块在一定温度区间呈现脱附性能，一般将温度控制在180℃—200℃，温度高不要超过220℃，避免余热过多导致冷却不完全，影响吸附段的效果。此外，增加脱附再生风量、降低浓度倍数，也可以达到充分的脱附再生效果。

Zeolite modules exhibit desorption performance within a certain temperature range. Generally, the temperature is controlled between 180 ℃ and 200 ℃, and the temperature should not exceed 220 ℃ to avoid incomplete cooling caused by excessive waste heat and affecting the effectiveness of the adsorption section. In addition, increasing the desorption regeneration air volume and reducing the concentration multiple can also achieve sufficient desorption regeneration effect.

在脱附温度控制上，控制系统采用了一段式逐渐升温的办法。考虑沸石模块在脱附过程中可能存在脱附不彻底、有VOCs残留、故障停机后无法脱附的情况。因此，在脱附升温初期，沸石模块的升温一定要有梯度，防止脱附过快造成脱附浓度急剧升高和温度变化剧烈影响沸石模块寿命。

In terms of desorption temperature control, the control system adopts a step-by-step heating method. Consider the possibility of incomplete desorption, residual VOCs, and inability to desorb after shutdown of the zeolite module during the desorption process. Therefore, in the early stage of desorption heating, the heating of the zeolite module must have a gradient to prevent rapid desorption from causing a sharp increase in desorption concentration and drastic temperature changes that affect the lifespan of the zeolite module.

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