农药WG、WDG生产线工艺流程方案：

The technical process scheme of the pesticide WG and WDG production line：

造粒操作单元是整套工艺的核心。造粒机是确定农药造粒、干燥工艺流程配置的关键，依据农药的特性、实验数据及工程应用实例，选用双螺杆挤出造粒机（传动轴部分加冷却水系统）或旋转造粒机，其造粒所需的湿含量约为12-18%。根据产品特性及生产工艺情况，确定本工艺设计方案主要由：⑴混合、⑵造粒、⑶干燥、⑷筛分、⑸包装、⑹热风及除尘系统组成。

The core of the whole process is the granulation operating unit. And the granulator is the key to determine the pesticide granulation and the configuration of the drying process, and according to the features of the pesticide, the experimental data and the examples of project application, select a twin-screw extrusion granulator (the transmission shaft parts and the cooling water system) or a rotary granulator, whose moisture contend required for the granulation is about 12-18%. According to the product characteristics and the situation of the production technology, it is determined that the design scheme of the process is mainly composed of: (1) mixing, (2) granulating, (3) drying, (4) screening, (5) packaging, and (6) hot wind and the dust pelletizing system.

1、混合：将粉体农药和液体所需比例分别投入混合机；混合机将粉体农药和液体连续混合均匀，使物料达到适合造粒所需的物料状态，以利造粒。

    1. Mixing: put the powder pesticide and the liquid into the mixing machine respectively according to the required proportion; the mixing machine will mix the powder pesticide and the liquid uniformly and continuously to make the material meet the material state that is suitable for granulation so as to facilitate the granulation.

2、造粒：将来自混合机混合均匀的湿物料，连续输送入造粒机料仓，在特殊设计的螺旋和挤出元件的输送、挤压作用下，物料从开孔模板被强制挤出，并形成条状。在挤出过程中和在后续操作过程（如干燥、包装等）条状物料自然断裂，从而得到长度基本均匀的圆柱状颗粒，长度一般在3.0-6.0mm之间（视物料性质变化）。模板开孔孔径可根据需要调整、更换，以得到所需粒度的颗粒成品，一般调节范围是φ0.6-φ1.8mm。

    2. Granulating: continuously send the evenly mixed moist material from the mixing machine into the feed bin of the granulator, and under the effects of the transmission and extrusion of the specially designed screw and the extrusion element, the material will be squeezed out forcibly from the perforated template and formed a strip. In the extrusion process and the subsequent operations (such as drying and packaging), the strip material will fracture naturally so as to get the cylindrical particles with the basically uniform length that is between 3.0mm and 6.0mm generally (according to the changes in the material property). The hole diameter of the template can be adjusted and changed according to the needs in order to obtain the particles of finished products with the required particle size, and the general adjustment range is φ0.6-φ1.8mm.

3、干燥：干燥是将造粒后湿含量为12-18%的颗粒状农药产品干燥至1-2%，并形成成品。该过程由干燥机来完成操作。第 一段干燥为高温干燥，以蒸发大量水分，第二段干燥为低温干燥，使物料在降温过程中蒸发微量水分，以利产品质量便于直接包装。这样更利于生产的稳定与干燥系统节能。

3. Drying: drying is to make the granular pesticide products with the moisture content of 12-18% after the granulation drying to 1-2% and form the final finished products. The operation of this process is completed by a drying machine. The first period of drying is high temperature drying to evaporate great quantities of water, and the second period of drying is low temperature drying to evaporate trace water that can improve the product quality and is convenient for direct packing. In this way, it is more helpful to the stability of the production and the energy saving of the drying system.

4、筛分：颗粒与粉尘的分离，提高成品的质量。

4. Screening: make the separation of particles and dust to improve the quality of the finished products.

5、包装：将成品颗粒通过负压的方式输送至包装机完成包装。

5. Packaging: send the particles of products to a packing machine through the method of negative pressure for the completion of packaging.

6、生产线热风及除尘系统：保证在生产过程中物料水分的蒸发及粉尘的回收，达到洁净生产和废气排放的环保要求。

6. The hot wind of the production line and the dust pelletizing system: ensure the evaporation of the material moisture and the recovery of dust in the process of production so as to meet the environmental requirements of clean production and exhaust emission.