Rapid online analysis method and system for raw material benzene hydrogenation process

Abstract

The invention discloses a rapid online analysis method and system for a raw material benzene hydrogenation process, and the method comprises the following steps: S1, measuring a density value through a DAS system, judging whether unloading operation is started or not, if yes, entering S2, and if not, starting non-unloading flow path measurement; s2, the DAS system reads license plate information, a circulating pump is started at the same time, and then chromatography and total nitrogen flow path measurement are started; s3, judging whether each group of measured values exceeds the standard or not through a DAS system, if yes, stopping operation and giving an alarm, and if not, entering step S4; s4, the DAS system starts chromatography and a total nitrogen flow path for continuous measurement, and information is recorded; s5, the density value is measured through a DAS system to judge whether unloading operation is finished or not, if yes, the step S6 is executed, and if not, judgment continues; and S6, starting chromatography and other analysis flow path measurement by the DAS system. According to the invention, data of a plurality of online analyzers are combined, and automatic quality judgment, raw material unloading control and the like are realized.

Description

Technical Field

[0001] The invention relates to a detection technology for a benzene hydrogenation process, and more specifically to a rapid online analysis method and system for a raw material benzene hydrogenation process. Background Art

[0002] At present, steel enterprises use manual sampling and offline analysis for incoming raw materials, intermediates and products of benzene hydrogenation units. The sampling and analysis time of crude (light) benzene tank trucks is about 4 hours, so each tank truck has to wait for about 4 hours. Since manual sampling and offline analysis are time-consuming and labor-intensive, there are problems of long analysis time and information lag. At the same time, since manual sampling and analysis are inevitably affected by the external environment, logistics risks increase accordingly.

[0003] With the deepening of smart manufacturing, the requirements for equipment automation and informatization are gradually increasing, and it is necessary to know the concentration of components in logistics more quickly. Therefore, it is necessary to establish an online analysis system for the quality control of benzene hydrogenation raw materials.

[0004] In existing patent applications, such as the Chinese utility model patent (application number: 201720157041.0), an efficient online monitoring system for volatile organic compounds is disclosed, including a sampling probe system, a backflush system, a pretreatment system, an online chromatograph, a PLC control system, a hydrogen generator, an air generator, a high-purity nitrogen generator, a data processing system and a data acquisition instrument. The online chromatograph is communicatively connected to the data processing system, and the data processing system is communicatively connected to the data acquisition instrument and the PLC control system respectively, and the PLC control system is communicatively connected to the sampling probe system, the backflush system, the pretreatment system, the hydrogen generator, the air generator, the high-purity nitrogen generator and the DCS respectively.

[0005] A Chinese utility model patent (application number: 201720088504.2) discloses an online air VOCs monitoring system, including a pre-treatment system, an analysis system and a transmission system connected in sequence, wherein the pre-treatment system includes a sampling module, and a transmission module and a storage device connected to the sampling module, and a backflush module is also connected between the sampling module and the transmission module; the transmission system includes an online chromatograph, an industrial computer, a host computer, a data acquisition device and a terminal receiving system connected in sequence.

[0006] In addition, "Application of Online Total Sulfur Analyzer in Catalytic Gasoline Hydrogenation Unit" (author: Jiang Meiling) points out that an online total sulfur analyzer is installed in the catalytic gasoline hydrogenation unit to introduce the total sulfur content into the control of light gasoline products, ensure the quality of gasoline products, and realize process control automation to the greatest extent.

[0007] The above patented technology and non-patented technology only use one online analyzer for online analysis, and do not perform product quality grading, control unloading and other operations. Summary of the invention

[0008] In view of the defects existing in the prior art, the purpose of the present invention is to provide a rapid online analysis method and system for the raw material benzene hydrogenation process, which combines the data of multiple online analyzers to realize automatic quality grading, control raw material unloading and other operations, thereby shortening the analysis time.

[0009] To achieve the above object, the present invention adopts the following technical solution:

[0010] The first aspect of the present invention provides a rapid online analysis method for a raw benzene hydrogenation process, comprising the following steps:

[0011] S1, measure the density value through the DAS system to determine whether the unloading operation has started, if so, proceed to step S2, if not, start the non-unloading flow path measurement;

[0012] S2, the DAS system reads the license plate information, starts the circulation pump, restarts the chromatography and total nitrogen flow measurement;

[0013] S3, judging whether each group of measured values ​​exceeds the standard through the DAS system, if so, stopping the operation and giving an alarm, if not, proceeding to step S4;

[0014] S4, the DAS system starts the chromatography and total nitrogen flow path to continue measuring, and records the information;

[0015] S5, determining whether the unloading operation is completed by measuring the density value through the DAS system, if so, proceeding to step S6, if not, continuing to determine;

[0016] S6. The DAS system starts chromatography and other analytical flow path measurements.

[0017] Preferably, in step S1, the non-unloading flow path measurement specifically includes the following steps:

[0018] S11, the DAS system starts the chromatogram and total nitrogen flow path valves, and simultaneously starts the chromatographic analyzer to measure the chromatogram and total nitrogen flow path;

[0019] S12. The DAS system records the chromatographic results and the average value of the total nitrogen chromatographic period.

[0020] Preferably, in step S2, the circulation pump is started for 3 minutes before starting the chromatography and total nitrogen flow measurement.

[0021] Preferably, in step S3, stopping the operation and giving an alarm specifically includes the following steps:

[0022] S31, the red light on the cabinet is on;

[0023] S32, the DAS system closes the electric control valve;

[0024] S33, the DAS system shuts down the circulation pump and instrument flow path;

[0025] S34, the DAS system transmits the alarm information to the MES data management platform, and the cabinet activates the sound and light alarm.

[0026] Preferably, in step S4, the DAS system records the chromatographic results and the average value of the total nitrogen within the chromatographic period.

[0027] The second aspect of the present invention provides a rapid online analysis system for a raw benzene hydrogenation process, comprising:

[0028] DAS system (data acquisition and processing), located in the central control room;

[0029] Online density meter, installed on the unloading pipeline;

[0030] An online moisture meter is arranged on the unloading pipeline;

[0031] A cabinet, which contains an online chromatograph, an online total sulfur analyzer, and a total nitrogen analyzer;

[0032] A sampling pipeline, connected to the unloading pipeline, used for the measurement of the online chromatograph, the online total sulfur analyzer, and the total nitrogen analyzer;

[0033] The online density meter and the online moisture meter transmit signals to the DAS system through a signal distributor;

[0034] The online chromatograph, the online total sulfur analyzer, and the total nitrogen analyzer transmit signals to the DAS system;

[0035] The DAS system transmits the data to the MES (manufacturing execution system) data management platform;

[0036] The rapid online analysis system implements the rapid online analysis method.

[0037] Preferably, the DAS system transmits data to the MES data management platform via OPC / RS485 acquisition method.

[0038] The invention provides a rapid online analysis method and system for a raw material benzene hydrogenation process, which realizes online analysis of raw material crude (light) benzene and automatic data transmission by combining data from an online analysis instrument with signals from an automatic license plate recognition system and manually input data, thereby improving efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a schematic diagram of the process of the rapid online analysis method of the present invention;

[0040] Figure 2 It is a schematic diagram of the on-site arrangement of the rapid online analysis system of the present invention. DETAILED DESCRIPTION

[0041] In order to better understand the above technical solution of the present invention, the technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0042] Combination Figure 1 As shown, the present invention provides a rapid online analysis method for a raw material benzene hydrogenation process, comprising the following steps:

[0043] S1. After the unloading personnel connect the unloading hose, they open the tanker valve. At this time, the measured value of the online density meter will rise rapidly. The DAS system will make a judgment. When the measured value of the online density meter exceeds the set threshold (such as greater than 0.8), it is judged that the unloading operation has started. The DAS system stops measuring other flow paths of the online chromatograph and measures the flow rate of purchased crude benzene.

[0044] S2. At this time, the DAS system reads the license plate information and records it in the data repository. At the same time, the circulation pump of the pre-treated sample is started. After a certain period of circulation (such as 3 minutes), the flow path measurement of the corresponding online chromatograph, online total sulfur analyzer, and total nitrogen analyzer is started, and the chromatographic measurement results are waited for;

[0045] S3. Compare the measured values ​​of moisture, density, total sulfur, total nitrogen and components (triphenyl content, C4-C7 content) of each online analyzer through the DAS system to see whether they meet the quality index requirements of qualified raw materials specified in Table 1 below; if the requirements are met, the green light of the indicator light on the cabinet lights up, and the electric-controlled pneumatic unloading valve is opened at the same time, and each online analyzer continues to measure during the unloading process; if the requirements are not met, the red light of the indicator light on the cabinet lights up, an audible and visual alarm is generated, and an alarm signal is sent to the MES data management platform, and the circulation and measurement of the chromatogram and the total sulfur and total nitrogen samples in the sampling pipeline are stopped at the same time, the electric-controlled pneumatic valve is closed, and subsequent unqualified raw material disposal is carried out;

[0046] S4, the DAS system starts the chromatography and total nitrogen flow path to continue measuring and record the information;

[0047] S5, determine whether the unloading operation is completed by measuring the density value through the DAS system, if so, proceed to step S6, if not, continue to determine;

[0048] S6. The DAS system starts chromatography and other analytical flow path measurements.

[0049] Disposal of unqualified raw materials mainly includes: relevant personnel dispose of unqualified raw materials. If unloading is required, higher-level management personnel need to enter the corresponding level password in the DAS system to start the unloading process. The sample large loop and chromatographic waste liquid outlet, and the total nitrogen analyzer waste liquid outlet all flow into the underground storage tank.

[0050] Online analytical instruments are unable to provide information such as appearance, visual moisture, and total chlorine, as well as manufacturer, crude benzene (light benzene) category, etc. The DAS system has the function of manually recording information such as sample appearance, visual moisture, total chlorine, manufacturer, crude benzene (light benzene) category, as well as other functions and interfaces for manual input of information required by users, and automatically saves and generates data reports, which are then transmitted to the MES data management platform.

[0051] Table 1 Technical indicators of crude (light) benzene

[0052]

[0053] Combination Figure 2 As shown, the present invention also provides a rapid online analysis system for a raw material benzene hydrogenation process, comprising:

[0054] The DAS system is placed in the central control room.

[0055] The online density meter 1 is installed on the unloading pipeline 2.

[0056] The online moisture meter 3 is installed on the unloading pipeline 2.

[0057] The cabinet 4 is provided with an online chromatograph, an online total sulfur analyzer and a total nitrogen analyzer.

[0058] The sampling pipeline 5 is connected to the unloading pipeline 2 and is used for the measurement of the online chromatograph, the online total sulfur analyzer and the total nitrogen analyzer.

[0059] The online density meter 1 and the online moisture meter 2 transmit signals to the DAS system through a signal distributor.

[0060] The online chromatograph, online total sulfur analyzer, and total nitrogen analyzer transmit signals to the DAS system, which manages and summarizes the data and generates reports in a fixed format.

[0061] The DAS system transmits data to the MES data management platform through OPC / RS485 collection method;

[0062] The rapid online analysis system of the present invention can automatically identify the license plate number of the crude benzene raw material, perform online analysis on various indicators, automatically judge the level in combination with manually input data, and combine various data into reports and output them to the MES data management platform, thereby realizing the rapid online analysis method of the present invention.

[0063] Those skilled in the art should recognize that the above embodiments are only used to illustrate the present invention, and are not intended to limit the present invention. As long as they are within the spirit of the present invention, any changes or modifications to the above embodiments will fall within the scope of the claims of the present invention.

Claims

1. A rapid online analysis method for a raw material benzene hydrogenation process, characterized in that: The following steps are involved: S1, measure the density value through the DAS system to determine whether the unloading operation has started, if so, proceed to step S2, if not, start the non-unloading flow path measurement; S2, the DAS system reads the license plate information, starts the circulation pump, restarts the chromatography and total nitrogen flow measurement; S3, judging whether each group of measured values ​​exceeds the standard through the DAS system, if so, stopping the operation and giving an alarm, if not, proceeding to step S4; S4, the DAS system starts the chromatography and total nitrogen flow path to continue measuring, and records the information; S5, determining whether the unloading operation is completed by measuring the density value through the DAS system, if so, proceeding to step S6, if not, continuing to determine; S6. The DAS system starts chromatography and other analytical flow path measurements.

2. The rapid on-line analysis method for the raw material benzene hydrogenation process according to claim 1, characterized in that: In step S1, the non-unloading flow path measurement specifically includes the following steps: S11, the DAS system starts the chromatogram and total nitrogen flow path valves, and simultaneously starts the chromatographic analyzer to measure the chromatogram and total nitrogen flow path; S12. The DAS system records the chromatographic results and the average value of the total nitrogen chromatographic period.

3. The rapid on-line analysis method for the raw material benzene hydrogenation process according to claim 1, characterized in that: In the step S2, the circulation pump is started for 3 minutes, and then the chromatography and total nitrogen flow path measurement are started.

4. The rapid on-line analysis method for the raw material benzene hydrogenation process according to claim 1, characterized in that: In step S3, stopping the operation and issuing an alarm specifically includes the following steps: S31, the red light on the cabinet is on; S32, the DAS system closes the electric control valve; S33, the DAS system shuts down the circulation pump and instrument flow path; S34, the DAS system transmits the alarm information to the MES data management platform, and the cabinet activates the sound and light alarm.

5. The rapid on-line analysis method for the raw material benzene hydrogenation process according to claim 1, characterized in that: In step S4, the DAS system records the chromatographic results and the average value of the total nitrogen in the chromatographic period.

6. A rapid online analysis system for a raw material benzene hydrogenation process, characterized in that: include: DAS system, located in the central control room; Online density meter, installed on the unloading pipeline; An online moisture meter is arranged on the unloading pipeline; A cabinet, which contains an online chromatograph, an online total sulfur analyzer, and a total nitrogen analyzer; A sampling pipeline, connected to the unloading pipeline, used for the measurement of the online chromatograph, the online total sulfur analyzer, and the total nitrogen analyzer; The online density meter and the online moisture meter transmit signals to the DAS system through a signal distributor; The online chromatograph, the online total sulfur analyzer, and the total nitrogen analyzer transmit signals to the DAS system; The DAS system transmits the data to the MES data management platform; The rapid online analysis system implements the rapid online analysis method as claimed in any one of claims 1 to 5.

7. The rapid online analysis system for the raw benzene hydrogenation process according to claim 6, characterized in that: The DAS system transmits data to the MES data management platform through OPC / RS485 acquisition mode.

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