On-line corrosion monitoring system of propane dehydrogenation reactor

Abstract

The invention discloses an on-line corrosion monitoring system of a propane dehydrogenation reactor. The monitoring system comprises the following steps of according to the basic principle of mechanics, the relationship among the section circumferential stress sigma, the circumferential strain epsilon, internal pressure p, radius R, elastic modulus EP and wall thickness t, and according to the known pressure in a cylinder, monitoring the circumferential strain change condition of the cylinder for a long time to obtain the wall thickness change of the cylinder, and adopting a stainless steel capillary tube as a main packaging material to protect and sensitize a fiber bragg grating; adopting a sensitization type FBG sensor to capture the circumferential strain change of the outer wall of thereactor cylinder so as to monitor the corrosion condition of the reactor cylinder body, so that the normal operation of the reactor cylinder is not influenced, the structure of the reactor cylinder is not damaged, the corrosion condition of the reactor cylinder can be monitored only by arranging the circumferential strain sensors on the outer wall of the reactor cylinder. The sensors adopt a special packaging means, so that the problems of durability, acid and alkali corrosion resistance, electromagnetic interference resistance and the like during long-term operation are solved.

Description

technical field [0001] The invention belongs to the field of petrochemical equipment safety monitoring, and in particular relates to an online corrosion monitoring system of a propane dehydrogenation reactor. Background technique [0002] The reactor is the main equipment of the propane dehydrogenation unit. After the raw material propylene is gasified and heated to 540-590°C, it enters the reactor, and dehydrogenation reaction is carried out in the reactor under the action of the catalyst. In the reactor, the reaction material must be kept at an absolute pressure of 0.05MPa and a reaction temperature of 650°C. The cylinder of the reactor is generally made of carbon steel and lined with refractory bricks. Due to the alternating occurrence of oxidizing and reducing atmospheres in the reactor, the metal will be corroded rapidly. The current method is to inject a small amount of dimethyl Disulfide is used to "passivate" the exposed metal surface in the reactor, but this method...

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Problems solved by technology

[0003] The object of the present invention is to provide a kind of corrosion on-line monitoring system of propane dehydrogenation reactor, to solve the means that adopts at present that proposes in the above-mentioned background technology is to inject a small amount of dimethyl disulfide before the inlet and outlet heat exchanger, with " Passivation” The exposed metal surface in the reactor, but this method is a passive protection type, the corrosion degree of the reactor cannot be controlled in real time, and there are hidden dangers in safe production

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