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Online decoking device and decoking method

A technology for cleaning coke and solid particles, which is applied in the direction of cleaning heat transfer devices, non-rotating equipment cleaning, lighting and heating equipment, etc., and can solve problems such as the deterioration of the operating condition of the reaction system, the reduction of the catalyst reaction performance, and the increase in the operating pressure of the reactor. Achieve the effect of reducing operating costs, easy handling, and maintaining consumption levels

Inactive Publication Date: 2015-01-14
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] One of the technical problems to be solved by the present invention is that in the cooler of the ammoxidation production acrylonitrile reaction system existing in the prior art, no on-line coke cleaning device is involved, so that the coke that adheres and accumulates in the cooler tubes is difficult to Eliminate the problems that lead to increased tube resistance, increased reactor operating pressure, worsened operating conditions of the reaction system, reduced catalyst reaction performance, increased device consumption, and shortened operating cycle. A new online coke cleaning device is provided.

Method used

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  • Online decoking device and decoking method

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Embodiment 1

[0035] Adopting the online decoking device of the present invention, the upper head of the cooler connected to the connecting end of the heat exchange section is cylindrical, and 5 swirl jet distributors are arranged in the upper head of the cooler, and the number of distributor blades is 5. The blade angle is 70°, the outlet diameter is 60mm, the connection between the sparger and the solid particle inlet pipeline is threaded, the ratio of the vertical distance from the sparger outlet to the tubes of the heat exchange section to the diameter of the heat exchange section is 2, the heat exchange The ratio of the opening diameter of the protection plate above the section tubes to the inner diameter of the tubes is 1.2, and the inert gas nitrogen is used as the power to transport the spherical sulfate solid particles with an average diameter of 5mm into the swirling flow distribution distributor and spray them through the distributor. Finally, the solid particles are distributed t...

Embodiment 2-9

[0038] According to each condition and step operation of embodiment 1, just change the mean diameter of solid particle, the kind of solid particle, the shape of solid particle, the ejection speed of solid particle, the type of distributor, the number of placement, the solid particle recovery tower solvent Operating conditions such as type, weight ratio of solvent to reaction gas, solvent temperature, ratio of the opening diameter of the protective plate to the inner diameter of the tube, specific process operating conditions and the pressure drop of the reaction gas cooler after the operation of the device, and the change of the catalyst’s acrylonitrile yield See Table 1 and Table 2 for the results of conditions, device operating cycle, recovery rate of solid particle components, wear and corrosion of cooler tube sheets and tubes.

[0039]

Embodiment 10

[0041] Using the online coke cleaning device and coke cleaning method of the present invention, five swirl jet distributors are placed in the upper head of the cooler, and the inert gas nitrogen is used as the power to transport the spherical sulfate solid particles with an average diameter of 5mm. In the swirl distribution distributor, the solid particles are distributed to each tube of the ammoxidation reaction gas cooler at a spray speed of 90m / s after being sprayed by the distributor, and the coke in the tubes is removed, and the acrylonitrile When the device was operated continuously for 18 months, the pressure drop of the cooler was 4.2kPa, which stabilized the pipe resistance of the cooler and the operating pressure of the reaction system. According to the operation period of the device, two absorption towers are installed at the outlet of the cooler, and the solid particle components are recovered by absorption. The solvent used in the absorption tower is sulfuric acid ...

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Abstract

The invention relates to an online decoking device and a decoking method. The online decoking device and the decoking method mainly solve the problems that in the prior art, because accumulated coking materials in a tube nest of an ammoxidation gas cooler are hard to remove, the operating pressure of a reactor rises, the reaction performance of catalysts is reduced, device consumption is increased, and the cycle of operation is shortened. The online decoking device comprises an ammoxidation gas cooler, a solid particle storage tank and a solid particle recovery tower. The ammoxidation gas cooler comprises a hollow upper sealing head and a heat exchange segment, the tube nest is distributed all over the heat exchange segment, at least one solid particle ejection distributor is arranged in the upper sealing head, the outlet of the solid particle storage tank is communicated with the solid particle ejection distributor after being connected with an inlet for the inert gas generated in ammoxidation in parallel, and the solid particle recovery tower is arranged at the outlet of the cooler. According to the technical scheme, reaction gas makes contact with solvent so that solid particle components can be recovered in the recovery tower, the problems are well solved, and the online decoking device and the decoking method can be applied to industrial devices used for online decoking of the ammoxidation gas cooler.

Description

technical field [0001] The invention relates to an online coke cleaning device and a coke cleaning method. Background technique [0002] The blockage of reaction gas cooler tubes is the main bottleneck of the long-term operation of the acrylonitrile plant, which not only affects the overall operation cycle of the acrylonitrile plant, but also increases the cost of equipment cleaning and the loss and waste of raw materials and products during shutdown and start-up, affecting the acrylonitrile plant. Economic benefits of nitrile plants. Therefore, it is of great practical significance and economic benefit to invent an online coke cleaning device to timely remove the coke in the tubes of the reaction gas cooler of the acrylonitrile unit and to solve the problem of blockage of the tubes of the reaction gas cooler. [0003] In the acrylonitrile plant, the reaction gas cooler is a key equipment, and its structure is a large vertical shell and tube heat exchanger, the reaction gas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F28G1/12F28G15/00
Inventor 顾军民熊瑾张斌
Owner CHINA PETROLEUM & CHEM CORP
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