Application of gas analyzer

Gas online monitoring system
1 Introduction A large amount of gas is produced in the coking process, which is also called coke oven gas. Because the gas contains a large amount of naphthalene and tar, a large amount of naphthalene crystallizes out in the gas in winter and the tar is coked, causing blockage of the gas pipeline and affecting gas transportation. In order to solve this problem, an electric trap is added between the outlet of the coke oven and the gas pipeline to trap naphthalene and tar in the gas. Because the gas is flammable and explosive, if the oxygen content in the gas exceeds the standard, an unsafe accident will occur in the electric trap. Therefore, an on-line oxygen analyzer is installed on the gas pipeline. When the oxygen content in the gas reaches the upper limit set value, the interlocking system acts to cut off the power supply of the electric trap to ensure safety. According to the characteristics of coke oven gas, TR-9200 Oxygen Analyzer of Xi'an Joneng Instrument Co., Ltd. was selected to measure the oxygen content in the gas. For detailed technical information and plans, you can directly consult 15091580679 18789429993 Zhang Bin.
2 working principle
TR-9200 Gas Oxygen Analyzer is based on the principle of electrochemical measurement. The use of a completely sealed fuel cell oxygen sensor is one of the most advanced oxygen measurement methods in the world. The fuel cell oxygen sensor is composed of a highly active oxygen electrode and a lead electrode, and is immersed in the KOH solution. Oxygen is reduced to hydroxide ions at the cathode, and lead is oxidized at the anode. So as to achieve the purpose of measuring the content of component 02.
Xi'an Juneng Instrument Co., Ltd. mainly produces: oxygen analyzer, dew point analyzer, hydrogen analyzer, infrared analyzer, alarm, coke oven gas oxygen analyzer, cement kiln gas analyzer, calcium carbide furnace exhaust gas analyzer, blast furnace coal injection system , Semi-water gas analyzer. Zhang Bin 15091580679
3 Structure and characteristics The instrument is divided according to functions, mainly composed of 3 parts: sampling system, pretreatment system and analysis control interlock system.
3.1 Sampling system Complete the on-site collection, transportation and filtration of sample gas, and then send it to the pretreatment unit in the analysis cabinet. The sampling method adopts dry sampling, and the length of the sample delivery pipeline is not more than 25m.
3.2 Pretreatment system It is composed of patented sampling probe, mist filter assembly, stainless steel structure large-volume filter assembly, dehumidifier, special anti-corrosion suction pump, peristaltic drainage pump, fine filter flow controller, etc. Its function: complete the purification, dust removal, dehumidification, voltage stabilization and steady flow of the sample gas, and its filtration accuracy can reach 0.11-1. The measured sample gas that meets the requirements is sent to the analytical instrument to ensure the accuracy and long-term reliability of the analytical instrument. See Figure 1.
3.3 Analysis control interlocking system TR-9200 analysis system adopts JNYQ-O-11 oxygen analyzer of Xi'an Joneng Instrument Co., Ltd. to complete the online continuous analysis of oxygen content of sample gas, and continuously output 4 ～ 20mA.DC signal. The oxygen analyzer has an alarm output contact, which can set the alarm and interlock value within the range. When the O: content concentration exceeds the limit, the alarm and interlock will be performed.
(1) Practical working conditions Flue gas dust content: ≤50g / Nm3;
Medium temperature: 20 ～ 200 ℃;
Medium pressure: -lOkPa ～ + lOkPa;
)-
Tar content: ≤500mg / m3;
Benzene content: ≤5 0rrig / m3;
H2S content: ≤ lOmg / m3;
Water content: saturated water vapor.
(2) Main technical parameters Measuring range: 02: 0 ~ 2%;
Linearity error: <± 1% FS;
Zero drift: ≤ ± 1% FS;
Range drift: ≤ ± 1% FS;
System response time: <30s;
Output signal: analog signal: 4 ～ 20mA.DC, passive contact of alarm signal;
Power supply: 220VAC 50Hz power 3 ～ 5kVA.
4. On-site use of the instrument This set of oxygen analyzers has been put into operation on gas naphthalene removal devices in many domestic coking industries. The analysis sampling point is at the outlet of the electric trap. Since commissioning, the operation has been relatively stable and the maintenance workload has been greatly reduced. In particular, the pretreatment system has a good processing effect, which ensures the accurate analysis of the analyzer, and also ensures the safe and stable operation of the electric trap.
5 Existing problems and countermeasures (1) Whether the analyzer can run stably, the pretreatment system is the key.
(2) Because the sampling device adopts dry sampling, once the power is cut off, the entire measurement system will be shut down. Therefore, it is best to use UPS to supply power in conditional locations.
Detailed technical information and plans can be directly consulted 15091580679 18789429993 Zhang Bin metallurgical industry online monitoring and analysis system overview:
The smelting of iron and steel and other metals will produce a large amount of gas. The analysis and measurement of these gases have a very important role in the production optimization, energy gas recovery, environmental protection, energy conservation and safety control of iron and steel metallurgical enterprises. The TR-9200 on-line analysis system produced by Joneng Company is free from background gas cross-interference, excludes the influence of dust and window pollution, and has a fast response speed. It is the best choice for gas analysis in the iron and steel metallurgical industry.
TR-9200 analysis system adopts micro positive pressure dustproof instrument cabinet structure. The system is composed of sampling unit, pretreatment unit, analysis unit, calibration unit, PLC interlock control central unit. Therefore, it is the most complete dustproof analysis system in China.

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Adapted items Analysis components Selection range Instrument selection blast furnace coal injection Room temperature O2 0 ～ 10% JNYQ—O－11C
CO 0 ～ 3000PPM JNYQ—I－ 41
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Adaptation items Analysis components Selection range Instrument selection Converter gas Normal temperature CO 0 ～ 80% JNYQ—I－ 41
O2 0 ～ 2% JNYQ—O－ 11C
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Adapted items Analysis components Selection range Instrument selection blast furnace gas Normal temperature O2 0 ～ 2% JNYQ—O－11C
CO 0 ～ 70% JNYQ—I－ 41
H2 0 ～ 50% JNYQ—I －41
CH4 0 ～ 50% JNYQ—I－41

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