Single-gas-phase fluidized bed reactor discharging openings applicable to multiregion polyreaction

Abstract

The invention relates to single-gas-phase fluidized bed reactor discharging openings applicable to a multiregion polyreaction. The discharging openings are formed in a single-gas-phase fluidized bed reactor (1) and characterized in that the discharging opening are divided into three layers, including an upper-layer discharging opening (12), a middle discharging opening (13) and a lower-layer discharging opening (14), all the discharging openings are provided with plunger valves (16) for partition, all the plunger valves (16) are each connected with an electric rotating valve (17), and the rotating speed and rotating mode of the electric rotating valve (17) are controlled by setting the material level, so that the discharging amount is controlled. Compared with the prior art, the single-gas-phase fluidized bed reactor discharging openings have the advantages of being high in discharging ability, flexible and adjustable in discharging mode, high in raw material utilization rate and the like.

Description

technical field [0001] The invention relates to a single-gas-phase fluidized-bed reactor discharge port, in particular to a single-gas-phase fluidized-bed reactor discharge port suitable for multi-zone polymerization reactions. Background technique [0002] With the continuous development of the polyethylene industry, gas-phase fluidized bed polyethylene technology and production lines are widely used (more than 70% in the world), and generally present the characteristics of large-scale and deep condensation. Among them, the most widely used U.S. Univation gas-phase fluidized bed polyethylene process (more than 50% in the world, about 200 sets) and ST gas-phase fluidized bed polyethylene process of Sinopec (about 6 sets), are constantly improving under the existing equipment conditions Production capacity has become an effective measure for major petrochemical enterprises to pursue efficiency. The emergence of modern condensation technology, especially deep condensation, ha...

AI Technical Summary

Problems solved by technology

In this case, the original discharge system that only designed one or several discharge ports on the same level can no longer fully meet the discharge requirements.

In addition, near the traditionally designed discharge outlet close to the top of the gas distribution plate, the condensing agent (inert long-chain alkanes: such as pentane, isopentane, n-hexane, etc.) and comonomers (such as butene) that have just entered the reactor -1, hexene-1, etc.) have not completely changed from the liquid phase to the gas phase, and are taken out together with the resin powder discharge, which not only destroys the gas-liquid-solid three-item balance in the lower part of the fluidized bed but also It affects the realization of the lower target product, and causes the fresh material added into the fluidized bed to be discharged without participating in the polymerization reaction and is wasted. It also makes the resin powder sticky due to the high liquid content and a large amount of waste of the condensing agent, which is also easy to cause The blockage of the discharge pipeline prevents discharge and increases the burden on the downstream degassing, dehydrocarbonation and recovery systems, which ultimately leads to reduction or waste of materials, energy and production efficiency

Images