The Revise Of PVC Process And Control Method In 30Stere Volume Kettle

Suspension method is widely used in producing PVC with its unique predominance. There are ten â…¡ type kettles in JINLU RESIN CO., LTD and the PVC output is up to 60 thousand ton annually. With the rapid development of PVC process technology, the resin is required higher quality. However, the volume of 30stere kettle is on the low side and the product is lower quality, repeatability and steadily. The kettle is demanded larger volume gradually in order to producing higher quality product with lower cost. To reduce the gap with industry, a series of reform is revised in process technology and control method.The main revise in process field as follows:(1) Feed stream by airtight(2) Feed water at the post of chloroethylene reaction(3) Revise monomer recycle processThe key point of the process is temperature control in the kettle which make the distribution of temperature of vapor and liquid ladderlike. For the nonlinearity, delay lag, and multi-variation of the polymerization, the mechanism model is difficultly built and applied to real-time control. The traditional control modes are mostly applied in current process so that the control is inaccurate and the effect of control is not answer for the optimum control requirement. On the condition, the research of control system is demanded urgently in PVC process used by intelligent control technique.The method is discussed in the paper that the real-time expert intelligent control system is introduced in the polymerization control. On the basis of difficulties and characteristic of polymerization in process control, the effective control method is put forward that is expert intelligent control. Real time expert system and intelligent control theory are explained facingpolymerization. The tactic of artifical intelligent expert control of polymerization is put forward. The process condition and characteristic of polymerization are analyzed and intelligent expert control system designed. This system is successfully applied to engineering project and great economic benefit is gained.