Cracking furnace exit temperature hybrid control method

Abstract

The invention relates to a cracking furnace exit temperature hybrid control method which aims at solving the problems that the existing method has poor control effect and can not meet the requirements for energy conservation, emission reduction and environment protection. The method provided by the invention comprises the following steps: firstly, designing a proportional integral controller of a cracking furnace exit temperature process by using a typical response curve method; then, establishing a process model required by a non-minimum model prediction function controller based on cracking furnace exit temperature real-time process data; and finally, designing a proportional integral controller of a non-minimum model prediction function, and obtaining current control parameter values in accordance with an objective function. In the method provided by the invention, the error between cracking furnace exit temperature process parameters and practical cracking furnace exit temperature process parameters can be effectively reduced, the defects of the traditional controller is further made up and the control device is ensured to be in the optimal operation state, thereby strictly controlling the cracking furnace exit temperature process parameters in the production process.

Description

technical field [0001] The invention belongs to the technical field of automation and relates to a non-minimization model prediction function (NMSSPFC) and proportional integral (PI) mixed control method for the outlet temperature of a cracking furnace. Background technique [0002] The cracking furnace is the core equipment of the ethylene production plant. Its stable operation plays a vital role in the smooth operation of the entire plant and the improvement of production efficiency. The temperature of the furnace tube is one of the important control parameters, and its control effect is good. There is a direct and important relationship between the degradation and the depth of cracking and the yield of ethylene. In the whole device, the outlet temperature control of the cracking furnace is strictly required and complicated in the whole device, and it is usually difficult to achieve effective control with ordinary conventional control. In the pyrolysis furnace, a large am...

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Problems solved by technology

These unfavorable factors lead to low precision of traditional control methods, which further lead to instability of subsequent production control parameters, low product qualification rate, and low boiler efficiency

At present, in the actual industry, the outlet temperature control of the cracking furnace basically adopts traditional or simple control methods, and the control parameters depend on the experience of technicians, which increases the production cost and the control effect is not ideal.

my country's pyrolysis furnace outlet temperature control and optimization technology is relatively backward, energy consumption remains high, control performance is poor, and the degree of automation is low. It is difficult to meet the needs of energy saving, emission reduction and indirect environmental protection. One of the direct influencing factors is cracking Problems with the Control Scheme of the Furnace Outlet Temperature System

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