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Corrosion evaluation method and corrosion evaluation device in ozone environment

A corrosion evaluation and ozone technology, applied in measuring devices, weather resistance/light resistance/corrosion resistance, instruments, etc., can solve problems such as instability, high molecular energy of ozone, corrosion and leakage of pipelines, etc., to improve test efficiency and have good application prospects , the effect of inefficiency

Pending Publication Date: 2021-07-20
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, ozone molecules have high energy and are extremely unstable. They are prone to produce hydroxyl radicals in water, have strong oxidizing properties, and are corrosive to various metal materials.
Corrosion leaks often occur in the equipment and some pipelines of the ozone catalytic oxidation unit in the refinery. At present, there is no mature laboratory evaluation test device for the research on the corrosion characteristics of the ozone catalytic oxidation environment.

Method used

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  • Corrosion evaluation method and corrosion evaluation device in ozone environment

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Embodiment 1

[0054] This embodiment provides a corrosion evaluation method under an ozone environment, and its application figure 1 The device in the sieve plate is evaluated, and the specific parameters are as follows: the mesh number of the sieve plate 9 is 18 meshes, and the vertical distance between the sieve plate 9 and the first gas-liquid distributor 10 is 30mm; the active components of the catalyst on the sieve plate 9 are Fe, Ni, Co (mass ratio is 3:2:5), the carrier is γ-alumina, the mass ratio of the active component to the carrier is 7:43, the catalyst is cylindrical, and the length is 3mm; the first rack 7 and the second rack The material of the rack 8 is polytetrafluoroethylene, and four test pieces 15 are suspended respectively, and the materials are respectively 20G, 304L, 316 and 316L; the distance between the first rack 7 and the second ultraviolet light source 11 (ring UV lamp) is 30mm , UV lamp power is 50W.

[0055] The distance between the second gas-liquid distribut...

Embodiment 2

[0058] This embodiment provides a corrosion evaluation method under an ozone environment, and its application figure 1 The apparatus in is evaluated, and the only difference with embodiment 1 is: the concentration of the ozone that is passed into the reaction chamber 5 is controlled to be 100mg / L.

[0059] The results show that: the corrosion rates of 20G, 304L, 316 and 316L in the test piece 15 of the top layer are 0.15mm / a, 0.11mm / a, 0.08mm / a and 0.08mm / a, and the corrosion rates of 20G, 304L, 316 and 316L in the bottom test piece 15 The corrosion rates of 304L, 316 and 316L are 0.18mm / a, 0.14mm / a, 0.09mm / a and 0.08mm / a, and the ozone content in the exhaust gas is 7ppm.

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Abstract

The invention discloses a corrosion evaluation method and a corrosion evaluation device in an ozone environment, and relates to the technical field of corrosion evaluation. The corrosion evaluation method in the ozone environment comprises the following steps: placing a to-be-tested piece in a reaction chamber for corrosion reaction, taking out the to-be-tested piece after the reaction is finished, and calculating the corrosion rate, wherein the reaction chamber is internally provided with an ozone and organic wastewater catalytic oxidation environment. A catalytic oxidation reaction of ozone and organic wastewater is carried out in a reaction chamber, the specific catalytic oxidation environment is simulated, a to-be-tested piece is placed in the reaction chamber for a corrosion reaction, and the to-be-tested piece is taken out after the reaction is finished to calculate the corrosion rate. The corrosion rate can be tested in a laboratory, the test efficiency of the corrosion rate is remarkably improved, and the method has a good application prospect.

Description

technical field [0001] The invention relates to the technical field of corrosion evaluation, in particular to a corrosion evaluation method and a corrosion evaluation device in an ozone environment. Background technique [0002] The composition of refinery sewage is complex, and there are many refractory organic substances. In order to improve the biodegradability of sewage, advanced oxidation technology is often introduced to decompose the refractory macromolecular organic substances into small molecular organic substances to improve the biodegradability of sewage. Import biochemical processing unit. The ozone catalytic oxidation technology is widely used in the field of sewage treatment due to its advantages such as fast reaction speed, no secondary pollution, small footprint, no additional transportation costs and management safety issues. [0003] However, ozone molecules have high energy and are extremely unstable. They are prone to produce hydroxyl radicals in water, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N17/00G01N31/10
CPCG01N17/00G01N17/006G01N31/10
Inventor 杜延年王雪峰张小建张宏飞段永锋王宁包振宇于凤昌
Owner CHINA PETROLEUM & CHEM CORP