沸石转轮浓缩VOCs净化技术是利用沸石分子筛吸附剂对排放废气中的VOCs进行吸附净化的技术。沸石分子筛是结晶硅铝酸盐，以其规整的晶体结构、均匀一致的孔分布和可调变的表面性质在VOCs废气治理领域得到广泛应用。沸石转轮是大多数涂装企业在治理VOCs过程中必不可少的系统部件，主要用于大风量低浓度的VOCs废气富集。

The zeolite rotary wheel concentration VOCs purification technology is a technology that uses zeolite molecular sieve adsorbents to adsorb and purify VOCs in exhaust gas emissions. Zeolite molecular sieve is a crystalline aluminosilicate, widely used in the field of VOCs waste gas treatment due to its regular crystal structure, uniform pore distribution, and adjustable surface properties. Zeolite wheel is an essential system component in the treatment of VOCs in most coating enterprises, mainly used for the enrichment of high air volume and low concentration VOCs waste gas.

一、沸石转轮的工作原理

1、 The working principle of zeolite wheel

众所周知，沸石转轮面在物理区间被分为吸附区、脱附区、冷却区域，各区域比例为10:1:1，分区图下图所示：

As is well known, the zeolite wheel surface is divided into adsorption zone, desorption zone, and cooling zone in the physical range, with a ratio of 10:1:1 for each zone. The zoning diagram is shown in the following figure:

大风量低浓度的VOCs经过沸石转轮后，由于分子之间的范德华力，VOCs被沸石微孔所吸附，净化后的气体可直接排至排气筒。被吸附在沸石转轮上的有机物再通过一小股180℃～200℃的温度的气体进行脱附。脱附出来的高浓度废气再送入其他设备进行处理，从而降低了末端处理设备的负荷，降低了运行能耗，被广泛使用在喷涂行业、包装行业、电子半导体行业。

After the high air volume and low concentration VOCs pass through the zeolite impeller, due to the van der Waals forces between molecules, VOCs are adsorbed by the zeolite micropores, and the purified gas can be directly discharged into the exhaust pipe. The organic matter adsorbed on the zeolite wheel is then desorbed through a small stream of gas at a temperature of 180 ℃ to 200 ℃. The high concentration waste gas desorbed is sent to other equipment for treatment, thereby reducing the load of the end treatment equipment and reducing operational energy consumption. It is widely used in the spray coating industry, packaging industry, and electronic semiconductor industry.

二、吸附脱附性能及改善措施

2、 Adsorption and desorption performance and improvement measures

转轮按设定的速度转动，实现了废气的循环吸附脱附。然而对于废气成分复杂，含有高沸点的有机物，往往180℃-200℃的温度不足以将有机物脱附出来，这些高沸点有机物残留在沸石的孔隙中，随着时间的推移，残留的累积量越来越多，可用于吸脱附的孔隙越来越少，终导致转轮出口有机物浓度偏高，排放不达标现象。因此，必须采取一定的措施，将高沸点组分从沸石中脱附出来，恢复转轮的吸附容量。

The wheel rotates at the set speed to achieve the cyclic adsorption and desorption of waste gas. However, for exhaust gases with complex components and high boiling point organic compounds, temperatures between 180 ℃ and 200 ℃ are often insufficient to desorb the organic compounds. These high boiling point organic compounds remain in the pores of zeolites, and over time, the accumulated amount of residues increases. The number of pores available for adsorption and desorption decreases, ultimately leading to a high concentration of organic compounds at the outlet of the impeller and substandard emissions. Therefore, certain measures must be taken to desorb high boiling components from the zeolite and restore the adsorption capacity of the impeller.

无论是哪种沸石转轮，厂商一般会建议周期性对转轮进行高温再生。如：将脱附温度设定为300℃，进行高温再生。然而，高温再生时转轮处在一个高温、高浓度的环境中，安全风险级别也非常高。常规做法是配备专业技术人员至现场操作、监控高温再生过程，并根据转轮及系统相关实际运行数据以及实践经验，实时手动调整运行参数或采取应急措施。显然，这样的操作，效率低下，对专业技术人员的依赖程度较高。因此，将沸石浓缩转轮手动高温再生操作，转换成自动程序控制，显得尤为迫切。

Regardless of the type of zeolite impeller, manufacturers generally recommend periodic high-temperature regeneration of the impeller. For example, set the desorption temperature to 300 ℃ for high-temperature regeneration. However, during high-temperature regeneration, the impeller is in a high-temperature, high concentration environment, and the safety risk level is also very high. The conventional approach is to equip professional technical personnel to operate and monitor the high-temperature regeneration process on site, and manually adjust operating parameters or take emergency measures in real time based on the actual operating data and practical experience of the impeller and system. Obviously, such operations are inefficient and rely heavily on professional technicians. Therefore, it is particularly urgent to convert the manual high-temperature regeneration operation of the zeolite concentration wheel into automatic program control.

三、高温热脱附控制逻辑设计

3、 Design of High Temperature Thermal Desorption Control Logic

转轮高温热脱附分两种模式，分别为“在线式”和“离线式”。

There are two modes for high-temperature desorption of the impeller, namely "online" and "offline".

“离线式”：高温再生时，转轮停止转动，脱附入口温度从200℃按一定的梯度逐步升温至300℃。高温脱附结束后，将转轮再生干净的区域转至冷却区，同时将含有高沸点的待脱附区域转入脱附区。根据以上原则，并结合转轮分区10:1:1的特点，可计算出转轮待高温再生区域送入转轮再生区域所要的运转时间。如：假设转轮50HZ运行，转1圈需要15min,因此从吸附区转至脱附区，转轮转动1次理论所需要的时间为：15min/(10+1+1)×60s/min=75s。但为保证各区域均能完全高温再生，转轮相邻两次高温再生面足够的搭接长度，同时兼顾转轮脱附区隔板保温厚度的影响，选取转轮每次连续转动时间为60s，此处称为步长为60s。

Offline mode: During high-temperature regeneration, the rotor stops rotating and the desorption inlet temperature gradually increases from 200 ℃ to 300 ℃ in a certain gradient. After the high-temperature desorption is completed, transfer the clean area regenerated by the impeller to the cooling zone, and at the same time, transfer the area containing high boiling points to the desorption zone. Based on the above principles and combined with the characteristics of the 10:1:1 partition of the impeller, the operating time required for the impeller to be sent into the high-temperature regeneration area can be calculated. For example, assuming the wheel runs at 50HZ and takes 15 minutes to complete one revolution, the theoretical time required for the wheel to rotate once from the adsorption zone to the desorption zone is: 15 minutes/(10+1+1) × 60s/min=75s. However, in order to ensure complete high-temperature regeneration in all areas, there is sufficient overlap length between the two adjacent high-temperature regeneration surfaces of the impeller, while taking into account the influence of the insulation thickness of the separator in the detachment zone of the impeller, a continuous rotation time of 60 seconds is selected for each rotation of the impeller, which is referred to as a step length of 60 seconds.