Purging method for signal reception optical window of online laser analyzer

Abstract

The invention discloses a purging method for a signal reception optical window of an online laser analyzer. Purging gas is used for purging the signal reception optical window of the online laser analyzer. The method is characterized in that the purging gas contains alkyne gas, N2, O2 and CO, wherein the content of O2 is lower than 0.10%, and the content of CH4 is lower than 4%. By means of the purging method, it is ensured that the transmittance of the laser analyzer is maintained above 90%, the optical window is cleaned, and it is guaranteed that carbon black dust in process media and water drops cannot be settled on the signal reception optical window of the laser analyzer. By selecting purging gas sources, stable operation of the laser analyzer is ensured, besides, the situation that external gas is brought into the process media and consequently affects product quality is avoided.

Description

technical field [0001] The invention relates to a process for producing acetylene by partial oxidation of natural gas, in particular to a purging method for a signal receiving optical window of a load-line laser analyzer in a load-line detection method for an oxygen content analyzer in the process for producing acetylene by partial oxidation of natural gas. Background technique [0002] Partial oxidation of natural gas to acetylene process, the raw natural gas and oxygen undergo partial oxidation reaction in the acetylene furnace, the core equipment of the cracking device, to generate cracked gas after preheating, the cracked gas leaves the acetylene furnace after dust removal, and the compression device downstream of the acetylene furnace will The cracked gas is compressed to 1.1MPa, and the compressed cracked gas enters the enrichment device, where the cracked gas is separated into three gas mixtures through the selective absorption of solvent (NMP): acetylene, tail gas and...

AI Technical Summary

Problems solved by technology

Because the cracked gas produced by the partial oxidation of natural gas to acetylene cracker contains a large amount of dust and polymers, the conventional oxygen content analyzer used in the past needs a pretreatment system to process the sample gas and then analyze it, resulting in pretreatment The system often has the problem of blockage of sampling pipes, and it is necessary for the instrumentation personnel to clear each sampling pipe at least once a day, resulting in a very heavy workload for the instrumentation personnel, resulting in the probability of human error operation, equipment operation and maintenance costs and failure rates are higher

More importantly, the process gas circulation time of the sampling pretreatment system is long, which causes a serious delay in the response time of the entire load-line analysis system, so that the measurement results cannot reflect the real oxygen content in the measured medium in real time, and the guidance for actual production is not strong. There are potential safety hazards

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