Explosion proof chemical high-temperature extraction zirconia analyzer

Explosion proof chemical high-temperature extraction zirconia analyzer

1. Background of the case

The ethylene cracking unit of a large petrochemical enterprise needs to monitor the oxygen content in high-temperature cracking gas in real time to prevent safety accidents caused by peroxide combustion and optimize combustion efficiency. The cracking gas temperature is as high as 800 ℃, containing tar, sulfide and dust, and the site belongs to the * * Ex d IIC T6 explosion-proof area (chemical plant environment). Traditional electrochemical oxygen analyzers cannot withstand high temperatures and corrosion, so an explosion-proof high-temperature extraction zirconia analyzer * * is selected, combined with a heat tracing sampling system, to achieve accurate and stable online monitoring.

2. Technical solution

(1) Equipment selection

Analyzer model: (explosion-proof type, range 0-25% O ₂, accuracy ± 1% FS).

Explosion proof certification: Ex d IIC T6 (compliant with GB 3836.1-2010).

Sampling system:

High temperature vacuum pump: capable of withstanding temperatures up to 1600 ℃, with an exhaust flow rate of 1.5L/min.

Heat tracing pipeline: electric heat tracing (200 ℃ constant temperature) to prevent the condensation of acidic gases.

Multi stage filtration: ceramic filter (sulfur resistant)+cyclone dust removal.

(2) Installation and Debugging

Sampling point: cracking furnace outlet pipeline.

Explosion proof wiring: Explosion proof junction boxes are used, and signals are transmitted to DCS through safety barriers.

Calibration method: Automatically introduce 5% O ₂ standard gas for calibration every week to reduce drift errors.

(3) Fault handling

Problem 1: Dust clogging the filter leads to delayed response.

Solution: Add a blowback system that automatically cleans the filter element every 2 hours.

Problem 2: High temperature causes abnormal diffusion of reference gas.

Solution: Use dynamic reference gas technology to stabilize the potential output.

High temperature extraction zirconia analyzer

LCD display, wall mounted, 0.00-25.00%, output 4-20mA, supports HART protocol, Chinese English switching, RS485 communication full function, microcontroller integrated circuit, flange installation, outer diameter 155mm, hole spacing 130mm (customizable), protective tube material: 316L, accuracy: 1%,

The diameter of the recrystallized silicon carbide protective tube is 35mm/25mm, and the temperature resistance of the flue gas is 0-1600 degrees. It is equipped with accessories such as a jet pump, pressure gauge, and high-temperature flange tee. The negative pressure environment is filled with compressed air at about 0.4MPA.