Multitube large power cracking reactor

Abstract

The invention discloses a multitube large power cracking reactor, a reactor array tube is arranged in a case (1), the reactor array tube is composed of several layers of lateral array tube units, each layer of array tube unit comprises several U-shaped nickel tubes(2), several U-shaped nickel tubes(2) are mutually connected in series to form the array tube unit, an air inlet (3) and an air outlet (4) are respectively arranged at a head part and a tail part of each layer of the array tube unit, the air inlet (3) of each layer of the array tube unit is stretched out of the case (1) through an air inlet pipe (12) and is communicated to an air inlet / outlet main pipe(5) placed outside the case (1), the air outlet of each layer of the array tube unit is stretched out of the case (1) through an air outlet pipe (14) and is communicated to the air inlet / outlet main pipe(5) placed outside the case (1), a ceramic heating ring (6) sleeved on the U-shaped nickel tubes(2) is connected to an electrical control apparatus, and a top temperature measurement thermal resistance (7) and a side surface temperature measurement thermal resistance (13) are respectively arranged at top and side surface of the case.

Description

technical field [0001] The invention relates to a multi-tube high-power cracking reactor. Background technique [0002] The domestic production of hexafluoropropylene and vinylidene fluoride mainly adopts empty tube cracking technology. The manufacturers all use tubular reactors. The preheated gas nickel tube is heated and reacted. The reaction nickel tube is covered with a high-temperature alloy tube for short-circuit heating. The heating power of the heating element is controlled by voltage and high current, which is generally controlled by a magnetic voltage regulator. Generally, the capacity of a single cracking furnace is about 500 tons. In order to increase the scale of a single cracking furnace, various manufacturers mainly increase the diameter of the reaction tube or increase the length of the reaction nickel tube, supplemented by matching short-circuit heating of the casing. . Devices above the scale generally use nickel tubes above DN40, and the length of the re...

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Problems solved by technology

Defects in the prior art 1.: Because the reaction nickel tubes are long, the entire reactor needs to be vertically arranged, and the workshop is relatively high; because the nickel tubes stand for a long time, the weight of the entire tubes is supported by the bottom of the tubes. The strength of the nickel tube becomes lower at high temperature, and the nickel tube is easily damaged due to thermal expansion and contraction; the length of a single reaction nickel tube is limited, which restricts the improvement of the capacity of a single reactor; due to the diameter of the reaction nickel tube Larger, the heat transfer effect is not good, the temperature difference in the reaction nickel tube is relatively large, that is, the difference between the wall temperature and the central temperature is relatively large, and the reaction temperature is increased, which will make the wall temperature higher and the probability of carbon deposition reaction will increase greatly; the existing technology exists Defect 2: Although the magnetic voltage regulator used in short-circuit heating has excellent stepless voltage regulation characteristics and is widely used in various electric heating systems, the magnetic voltage regulator itself is a large heating body with more heat dissipation. The copper chuck on the heating sleeve also needs to pass through cooling water, which makes the thermal efficiency of the electric heating system significantly lower; the magnetic voltage regulator also occupies a certain equipment layout space. According to the current safety regulations for equipment layout, the magnetic voltage regulator and The main device must have a certain safety distance, which increases the cost of device construction

This utility model improves the structure of the existing single-tube pyrolysis reactor, but the structure is relatively complicated, and the arrangement of internal parts in the small furnace tube is of little significance relative to the shorter residence time of the empty tube pyrolysis, and does not solve the problem of the pyrolysis reactor. The defects of low production capacity and high energy consumption

With the increasing scale of domestic vinylidene fluoride and hexafluoropropylene plants, the current various cracking reactors cannot expand the production capacity arbitrarily according to the needs. The reaction part of the large-scale plant often occupies more land, which is very It is huge and requires many operators and control personnel, which increases the construction and operation costs. The development of new reactors with large capacity, energy saving and compact layout has become an inevitable demand for domestic fluorine-containing monomer production technology progress.

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