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
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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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