Abstract: By-product gaseous hydrocarbons from petroleum refineries. Mainly from crude oil distillation, catalytic cracking, thermal cracking, petroleum coking, hydrocracking, catalytic reforming, hydrofinishing and other processes.
The instrument is equipped with 4 valves and 5 columns, and dual thermal conductivity detectors for gas analysis or natural gas composition analysis in refineries. One sample can complete the complete analysis of the refinery gas composition. Components include H2, O2, N2, CO, CO2, H2S, C1-C5, C6 (hydrocarbons above C6). The detection range is 0.01% -100% (volume fraction).
Channel I contains a gas sampling 10-port valve with backflushing function, and channel II contains a gas sampling 10-port valve and two six-way valves with isolation function, in which the 10-port valve has the functions of sequence reversal and backflushing.
The analysis system can complete the analysis of various components of refinery gas with one sample injection. Data processing and quantification are completed by the special workstation of refinery gas, and the calorific value of each component (molar calorific value, mass calorific value, Parameters such as volume calorific value and Wobbe index), the valve switching is done by the chromatograph host.
Chromatogram of four-valve and five-column analysis of refinery gas
Refinery gas four-valve five-column system flow chart
working principle:
The measurement of the system is carried out on two channels. After the sample is injected through the valve, the valve 4 introduces the sample into the channel I. After H2 flows out, the valve 4 is turned back to blow back the remaining components to empty. At the same time, the sample on channel II enters the separation system, after pre-column 1 separation, the column flow direction is changed, C5H10, C6 hydrocarbons are blown back to the TCD detector, and valve 2 and valve 3 respectively collect CO2, ethylene, ethane, N2 , O2, CH4 and CO, thereafter acetylene, H2S and C3-C5 hydrocarbons flow through the TCD detector to detect, when n-pentane flows out, turn back to valve 2 and valve 3 in order to make CO2, ethylene, ethane, N2, O2, CH4 and CO flow into the TCD detector.
Features:
1. The instrument system is a multi-packed chromatographic analysis method with fully packed columns and full TCD, which has a large column load and a high degree of automation.
2. A single injection can get the content of each component of refinery gas, and the four C4 olefin isomers are well separated.
3. It is not affected by the injection volume within the linear range, and is not harsh on the injection requirements.
4. The two channels are independent of each other. If it is not necessary to detect the H2 content, only channel â…¡ can be used.
5. N2 and O2 are detected separately, C5H10 and C6 hydrocarbons are used as a backflush peak detection
6. The analysis system is a full-component analysis of refinery gas. The quantification is simple, and it is convenient to use the internal normalization method with correction factors to quantify.
7. The system flow is suitable for all applications that require separation of N2, O2, CO2, CH4, CO and C2-C5 hydrocarbons.
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