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農藥WG、WDG生產線工藝流程方案：

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

造粒操作單元是整套工藝的核心。造粒機是確定農藥造粒、干燥工藝流程配置的關鍵，依據農藥的特性、實驗數據及工程應用實例，選用雙螺桿擠出造粒機（傳動軸部分加冷卻水系統(tǒng)）或旋轉造粒機，其造粒所需的濕含量約為12-18%。根據產品特性及生產工藝情況，確定本工藝設計方案主要由：⑴混合、⑵造粒、⑶干燥、⑷篩分、⑸包裝、⑹熱風及除塵系統(tǒng)組成。

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：將粉體農藥和液體所需比例分別投入混合機；混合機將粉體農藥和液體連續(xù)混合均勻，使物料達到適合造粒所需的物料狀態(tài)，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：將來自混合機混合均勻的濕物料，連續(xù)輸送入造粒機料倉，在特殊設計的螺旋和擠出元件的輸送、擠壓作用下，物料從開孔模板被強制擠出，并形成條狀。在擠出過程中和在后續(xù)操作過程（如干燥、包裝等）條狀物料自然斷裂，從而得到長度基本均勻的圓柱狀顆粒，長度一般在3.0-6.0mm之間（視物料性質變化）。模板開孔孔徑可根據需要調整、更換，以得到所需粒度的顆粒成品，一般調節(jié)范圍是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：干燥是將造粒后濕含量為12-18%的顆粒狀農藥產品干燥至1-2%，并形成成品。該過程由干燥機來完成操作。第 一段干燥為高溫干燥，以蒸發(fā)大量水分，第二段干燥為低溫干燥，使物料在降溫過程中蒸發(fā)微量水分，以利產品質量便于直接包裝。這樣更利于生產的穩(wěn)定與干燥系統(tǒng)節(jié)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、篩分：顆粒與粉塵的分離，提高成品的質量。

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

5、包裝：將成品顆粒通過負壓的方式輸送至包裝機完成包裝。

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

6、生產線熱風及除塵系統(tǒng)：保證在生產過程中物料水分的蒸發(fā)及粉塵的回收，達到潔凈生產和廢氣排放的環(huán)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.