Breaking down of the bottleneck problem of "stuck neck"——Record of tapping the potential and increasing efficiency of the ethylene plant of Daqing Petrochemical No. 1 Plant

"As the ethylene production base with the best resource conditions and the best product output in Northeast China, after more than 30 years of unremitting efforts, the production capacity of the first chemical plant has grown from 300,000 tons/year to 1.

One of the "stuck necks":

Hydrogenation catalyst relies on imports

It has been more than 30 years since the cracking device of Daqing Petrochemical No.

Due to the process complexity and raw material characteristics of the C2 pre-hydrogenation unit, there are strict requirements on the activity, selectivity and stability of the catalyst

"In daily operation, we dynamically adjust the reactor inlet temperature according to the load of each bed reactor, so that the catalyst in each bed can exert the best performance.

The second of "stuck neck":

High energy consumption of cracking unit

In order to solve the problem of high energy consumption of an ethylene cracking unit, the technical staff of the plant started a 16W cracking furnace to process propane separately from the source of the feed

The project team determined the feasibility and operating conditions of furnace cracking propane through analysis and research on raw materials and process flow

　　"Just through such a small technological transformation, the purpose of reducing cost

　　The third "stuck neck":

　　Low automation level of cracking furnace

　　The cracking furnace is the lifeblood of the ethylene plant, and its operation plays a key role in the energy consumption of the plant and the smooth operation of the subsequent units

　　To this end, the plant fully integrated the idea of ​​human-like intelligent control, explored and explored the combination of pole configuration control technology and feedforward control technology, and then continuously debugged in the workshop, designed and developed an advanced control system for the cracking furnace, which significantly improved the automation of the device.

　　They also combined the actual situation of the pH value automatic control technology of the rapid cooling system of the three pyrolysis devices, connected the pH value control system to the original DCS, and used advanced algorithms to enhance the stability of the control pH value measurement