Opposed type solid particle spraying distributor online coke cleaning device

A solid particle, opposing technology, used in the cleaning of heat transfer devices, non-rotating equipment cleaning, lighting and heating equipment, etc., can solve problems such as deterioration of reaction system operating conditions, reduction of catalyst reaction performance, and increase of reactor operating pressure, etc. Achieve the effect of strengthening the gas-solid mixing effect, stabilizing the reaction performance, and maintaining the consumption level

Active Publication Date: 2019-04-30
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is that in the cooler of the ammoxidation production acrylonitrile reaction system existing in the prior art, the existing single-nozzle solid particle spray distributor has uneven particle distribution and sticky particles in some of the cooler tubes. It is difficult to remove the accumulated coke, which leads to an increase in channel resistance, an increase in the operating pressure of the reactor, a deterioration in the operating condition of the reaction system, a decrease in the catalyst reaction performance, an increase in device consumption, a shortened operation period, and an increase in operating costs due to non-recovery of solid particles To solve the problem, provide a new online coke cleaning device with opposed solid particle jet distributor

Method used

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  • Opposed type solid particle spraying distributor online coke cleaning device
  • Opposed type solid particle spraying distributor online coke cleaning device
  • Opposed type solid particle spraying distributor online coke cleaning device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Adopt the on-line decoking device of solid particle recycling of the present invention, arrange jet distributor in the cooler upper head, jet distributor is made up of opposite type 4 nozzles, the pressure drop of reaction gas cooler at the initial stage of starting up is 4kPa, with inertness The gas nitrogen is used as the driving force, and the spherical iron ball particles with an average diameter of 5mm are transported to the opposed solid particle spray distributor through the solid particle feeder. After being sprayed by the distributor, the solid particles are distributed to the In each tube of the ammoxidation reaction gas cooler, the coke in the tubes was removed. When the acrylonitrile unit operated continuously for 24 months, the pressure drop of the cooler was 4.2kPa, which stabilized the resistance of the cooler tubes and pipes. The operating pressure of the reaction system and the acrylonitrile yield of the catalyst remain unchanged, which maintains the con...

Embodiment 2～9

[0034] Operate according to each condition and step of embodiment 1, just change the kind of inert gas, the average diameter of solid particles, the kind of solid particles, the shape of solid particles, the ejection speed of solid particles, the type of distributor, the number of placements, The type and number of gas-solid separators, the ratio of the opening diameter of the protective plate to the inner diameter of the tube, etc., the specific process operating conditions and the pressure drop of the reaction gas cooler after the operation of the device, the change of the acrylonitrile single-recovery of the catalyst, and the operation of the device See Table 1 and Table 2 for the results of cycle, cooler tube sheet and tube erosion and wear.

[0035] Table 1 comparative example and embodiment process condition contrast

[0036]

[0037]

[0038] Table 2 comparative example and embodiment device operation result contrast

[0039]

[0040] Note: The sign "-" in the...

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Abstract

The invention relates to an opposed type solid particle spraying distributor online coke cleaning device. The device main solves the problem in the prior art of the hard removing of coke accumulated in gas cooler tubes. The device includes a solid particle storage tank, an ammonia oxidation reaction gas cooler, a solid particle unloading device, a solid particle spraying distributor and gas-solidseparators; the ammonia oxidation reaction gas cooler includes a hollow upper head and a heat exchange section distributed with the tubes; the upper part of the heat exchange section is provided witha protection plate; the solid particle spraying distributor is placed in the upper head along an axial direction; a solid particle distributor is arranged in an opposed manner at least by more than two nozzles which are in opposed arrangement or inclined at a certain angle; the inlet of inert gas communicates with the solid particle spraying distributor after being parallel with the outlet of thesolid particle storage tank; and the outlet of the cooler is provided with at least one gas-solid separator to recycle solid particles. Thus, the problem can be well solved, so that the device can beused for online coke removing industrial devices.

Description

technical field [0001] The invention relates to an online decoking device of an opposed solid particle jet distributor. technical background [0002] In the field of propylene ammoxidation to produce acrylonitrile, because the high-temperature reaction gas generated by the reaction contains easily polymerizable compounds such as acrylonitrile, hydrocyanic acid, and acrolein, the polymerization reaction is likely to occur during the cooling process of the reaction gas, and the resulting polymer and The catalyst dust brought out by the fluidized bed reactor adheres and accumulates in the tubes of the reaction gas cooler. With the prolongation of the operation time, the scale layer on the inner wall of the tubes gradually increases, and the channels in the tubes gradually decrease, resulting in the blockage of the tubes. , Increase pipeline resistance, when the scale layer reaches a certain thickness, the operating pressure of the reaction system will increase significantly, de...

Claims

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Application Information

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IPC IPC(8): F28G1/12
CPCF28G1/12
Inventor 王清立顾军民张斌
Owner CHINA PETROLEUM & CHEM CORP
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