Online analysis system applied to coke oven gas production line

Abstract

The invention relates to an online analysis system applied to a coke oven gas production line. The online analysis system comprises a sampling module, a pretreatment module, a chromatographic analysis module and an oxygen analysis module. The sampling module is used for continuously collecting sample gas; the pretreatment module comprises a steady flow filtering unit and a rapid loop unit; the steady flow filtering unit is used for depressurizing and filtering the sample gas; the chromatographic analysis module comprises a chromatographic analyzer and a first flow meter; the chromatographic analyzer is connected with the steady flow filtering unit; the first flow meter is connected between the chromatographic analyzer and the steady flow filtering unit; the oxygen analysis module comprises an oxygen analyzer and a second flow meter; the oxygen analyzer is connected with the steady flow filtering unit; the second flow meter is connected between the oxygen analyzer and the steady flow filtering unit; and residual sample gas which is not output to the chromatographic analyzer and the oxygen analyzer in the steady flow filtering unit is returned to the coke oven gas production line through the rapid loop unit. The stability and the result accuracy of the online analysis system can be improved, and the maintenance cost of the system is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of coke oven gas analysis, and in particular to an online analysis system applied to a coke oven gas production line. Background Art

[0002] Coke oven gas (COG) is a byproduct produced during the coking process. Its main components include hydrogen, methane, carbon monoxide, carbon dioxide, nitrogen, and small amounts of hydrogen sulfide and ammonia. Currently, COG analysis systems rely primarily on traditional offline analysis methods. This method requires collecting COG samples and sending them to a laboratory for analysis. This is not only time-consuming but also lacks real-time analysis results. Furthermore, offline analysis methods typically require the use of large amounts of chemical reagents, which can pollute the environment. Furthermore, the process is cumbersome and requires high operator expertise.

[0003] With the increasing demand for automation and intelligent manufacturing in industrial production, traditional offline analysis methods are no longer able to meet the demands of modern coke oven gas production lines. This has necessitated the emergence of online analysis systems. Online analysis systems collect, analyze, and provide real-time data from coke oven gas production lines. However, existing online analysis systems still face numerous challenges in terms of real-time performance, safety, and stability. Dust, tar, naphthalene, and other substances contained in coke oven gas can easily clog the sampling pipeline, directly impacting the operational stability and safety of the online analysis system. To address this issue, existing techniques typically employ multiple sets of pretreatment equipment after sampling to perform cleaning and adsorption on the sample gas. However, these multiple pretreatment steps before the sample gas enters the analyzer cause lags in gas detection data, hindering the real-time performance of the online analysis system. This also prolongs gas residence time and increases gas condensation. Furthermore, the numerous pretreatment steps complicate the system, increasing maintenance costs and the likelihood of failure, impacting system stability and safety.

[0004] Therefore, developing an online analysis system with high safety, high stability and low maintenance cost has become a technical problem that needs to be solved urgently in the field of coke oven gas analysis. Summary of the Invention

[0005] In order to improve the stability of an online analysis system and the accuracy of analysis results and reduce system maintenance costs, the present application provides an online analysis system for use in a coke oven gas production line.

[0006] The present application provides an online analysis system for use in a coke oven gas production line, which adopts the following technical solutions: An online analysis system applied to a coke oven gas production line comprises: Sampling module, used to connect to the coke oven gas production line and collect sample gas; A pretreatment module, comprising a steady-flow filter unit and a fast-loop unit; the steady-flow filter unit is connected to the sampling module and is used to reduce the pressure of the sample gas and filter water and particulate matter in the sample gas before output; the fast-loop unit is used to connect the steady-flow filter unit and the coke oven gas production line; A chromatographic analysis module, comprising a chromatographic analyzer and a first flow meter; the chromatographic analyzer is connected to the steady flow filter unit via the first flow meter; the first flow meter is used to limit the flow rate of sample gas output from the steady flow filter unit to the chromatographic analyzer; An oxygen analysis module includes an oxygen analyzer and a second flow meter; the oxygen analyzer is connected to the steady flow filter unit via the second flow meter; the second flow meter is used to limit the flow rate of sample gas output from the steady flow filter unit to the oxygen analyzer; the remaining sample gas in the steady flow filter unit that is not output to the chromatograph and the oxygen analyzer is returned to the coke oven gas production line through the fast loop unit.

[0007] By adopting the above technical solution, when online analysis of coke oven gas is required, the sampling module continuously collects a large flow of sample gas from the coke oven gas production line and outputs it to the pretreatment module. The pretreatment module's steady-flow filtration unit briefly filters water and particulate matter from the sample gas before feeding it into the fast-loop unit, the chromatographic analysis module, and the oxygen analysis module. The chromatographic analysis module analyzes the composition of elements such as H2, N2, CH4, and CnHm in the sample gas, while the oxygen analysis module analyzes the oxygen content in the sample gas. The presence of the first and second flowmeters limits the flow of sample gas entering the chromatographic analysis module and the oxygen analysis module. Excess sample gas output from the steady-flow filtration unit is fed back to the coke oven gas production line via the fast-loop unit. This ensures that the sample gas flow rate and velocity remain high while meeting the input requirements of the chromatographic analysis module and the oxygen analysis module. This significantly reduces the residence time of the sample gas in the transmission pipeline, reduces the amount of sample gas condensation, and reduces the probability of pipeline blockage. This improves the stability and safety of the entire system and reduces maintenance costs. Moreover, the entire pre-processing steps of the system are simple, which reduces the retention of sample gas in the transmission pipeline and ensures the real-time and accuracy of the analysis results.

[0008] Optionally, the steady flow filtration unit includes a first filter, a first pressure reducing valve and a second filter; the input end of the first filter is connected to the sampling module, the output end of the first filter is connected to the input end of the first pressure reducing valve, and the first filter is used to filter particulate matter in the sample gas; the output end of the first pressure reducing valve is connected to the input end of the second filter, and the second filter is used to filter water and particulate matter in the sample gas, and the main output end of the second filter is connected to the first flow meter and the second flow meter; the fast loop unit includes a return pipe and a one-way valve; the return pipe is used to connect the bypass output end of the second filter and the coke oven gas production line, and the one-way valve is arranged on the return pipe to enable the second filter to output unidirectionally to the coke oven gas production line.

[0009] By adopting the above technical solution, the first filter initially filters particulate matter from the sample gas, preventing it from entering subsequent components and causing damage to components or pipe blockage. The first pressure reducing valve reduces the pressure of the collected sample gas, ensuring that subsequent components operate at the appropriate pressure and ensuring system safety. The second filter filters water and particulate matter from the sample gas, further purifying the sample gas and preventing water and particulate matter in the sample gas from damaging the chromatograph and oxygen analyzer, thereby improving the accuracy of subsequent analysis. The return pipe of the fast loop unit can return the remaining sample gas to the low-pressure area of ​​the coke oven gas production line, avoiding waste and forming a loop in the system. The setting of the one-way valve prevents the coke oven gas production line from accidentally inputting sample gas back into the steady flow filter unit through the return pipe, causing system failure or equipment damage.

[0010] Optionally, the chromatography analysis module also includes a third filter, a carrier gas input pipe, a first calibration unit and a first purge unit; the third filter is connected between the first flowmeter and the chromatograph, and is used to filter particulate matter in the sample gas; the carrier gas input pipe is used to connect to the first carrier gas input end of the chromatograph; the first calibration unit is connected to the chromatograph for calibrating the chromatograph; and the first purge unit is used to purge the inside of the shell of the chromatograph.

[0011] By adopting the above technical solution, the third filter further filters the tiny particles in the sample gas, preventing the particles from damaging or clogging the chromatograph, thereby improving the service life and analysis accuracy of the chromatograph. The carrier gas input tube connects the external carrier gas bottle and the first carrier gas input end of the chromatograph, which can provide carrier gas to the chromatograph to ensure the normal operation of the chromatographic analysis. The first calibration unit can provide calibration for the chromatograph when the chromatograph has been used for a long time and has deviations, ensuring the accuracy and reliability of the chromatographic analysis results. The first purge unit purges the interior of the chromatograph shell to ensure that the inside of the chromatograph is always at a positive pressure, preventing flammable gas from entering the shell of the chromatograph, and improving the safety of the system.

[0012] Optionally, the first calibration unit includes a first three-way control valve and a chromatographic standard gas input pipe; the three ports of the first three-way control valve are respectively connected to the main output end of the second filter, the input end of the first flow meter and the chromatographic standard gas input pipe; the first purge unit includes an instrument air input pipe and a fourth filter, the instrument air input pipe is connected to the purge gas input end and the second carrier gas input end of the chromatographic analyzer; the fourth filter is arranged on the instrument air input pipe.

[0013] By adopting the above technical solution, when the chromatograph produces a deviation, the first three-way control valve is switched to inject a standard gas with a known component content into the chromatograph for calibration analysis, so as to ensure the accuracy and reliability of the analysis results of the chromatograph. The instrument air inlet pipe in the first purge unit can not only input air into the chromatograph, so that the chromatograph is always under positive pressure, and prevent the flammable gas from entering the chromatograph and coming into contact with the electrical components to cause an explosion; it also acts as a combustion-supporting gas, using the oxygen contained in the air to assist the combustion of the hydrogen output from the carrier gas inlet pipe, and ensure that the chromatographic analysis is carried out normally. The fourth filter filters the air input from the instrument air inlet pipe, improves the cleanliness of the air, and prevents impurities in the air from entering the chromatograph and damaging components, thereby improving the stability and safety of the system operation.

[0014] Optionally, the oxygen analysis module also includes a second pressure reducing valve, a fifth filter, a second calibration unit and a second purge unit; the second pressure reducing valve is connected between the second filter and the second flow meter, and is used to limit the pressure of the sample gas output by the second filter to the second flow meter; the fifth filter is connected between the second flow meter and the oxygen analyzer, and is used to filter particulate matter in the sample gas; the second calibration unit is connected to the oxygen analyzer for calibrating the oxygen analyzer and inputting carrier gas into the oxygen analyzer; the second purge unit is used to purge the inside of the housing of the oxygen analyzer.

[0015] By adopting the above technical solution, the second pressure reducing valve can further reduce the pressure of the sample gas input into the oxygen analyzer and improve the stability of the sample gas pressure. The fifth filter further filters the tiny particles in the sample gas to prevent the particles from damaging or clogging the oxygen analyzer, thereby improving the service life and analysis accuracy of the oxygen analyzer. The carrier gas input pipe connects the external carrier gas bottle and the first carrier gas input end of the chromatograph analyzer, and can provide carrier gas for the chromatograph analyzer to ensure the normal operation of the chromatographic analysis. The second calibration unit can provide calibration for the oxygen analyzer when the oxygen analyzer has been used for a long time and has deviations, thereby ensuring the accuracy and reliability of the oxygen analysis results. The second purge unit purges the inside of the oxygen analyzer shell, so that the oxygen analyzer is always under positive pressure, preventing combustible gas from entering the shell of the oxygen analyzer, and improving the safety of the system.

[0016] Optionally, the second calibration unit includes a reference gas input pipe, a range gas input pipe, a pneumatic valve, a second three-way control valve and a third three-way control valve; the reference gas input end of the oxygen analyzer is connected to the reference gas input pipe, the pneumatic valve is connected between the fifth filter and the oxygen analyzer, and is used to control the on and off of the sample gas input into the oxygen analyzer, and the pneumatic control end of the pneumatic valve is connected to the reference gas input pipe; the first port and the second port of the second three-way control valve are respectively connected to the main output end of the second filter and the input end of the second pressure reducing valve, the first port and the second port of the third three-way control valve are respectively connected to the reference gas input pipe and the range gas input pipe, and the third port of the second three-way control valve is connected to the third port of the third three-way control valve.

[0017] By adopting the above technical solution, the pneumatic valve can only be opened and sample gas can enter the oxygen analyzer when reference gas is output. This prevents the sample gas from being input alone, which may cause distortion of the oxygen analyzer's measurement results and sensor poisoning and damage. It also avoids explosions caused by the high concentration of combustible components in coke oven gas coming into contact with the components within the oxygen analyzer, thereby improving the stability and safety of system operation. At the same time, if the oxygen analyzer deviates from its use over time, the second and third three-way control valves are switched to input reference gas with zero oxygen content and span gas with a predicted oxygen content into the oxygen analyzer. This calibrates the oxygen analyzer's maximum and minimum oxygen content detection values, ensuring the accuracy and reliability of the oxygen analyzer's analysis results.

[0018] Optionally, the second purge unit includes a purge, an inert gas input pipe and a third pressure reducing valve; the input end of the purge is connected to the inert gas input pipe, the output end of the purge is connected to the purge gas input end of the oxygen analyzer, the purge gas output end of the oxygen analyzer is connected to the exhaust gas input end of the purge, and the purge can detect the combustible gas content in the gas output by the oxygen analyzer; the third pressure reducing valve is arranged on the inert gas input pipe to limit the gas pressure output from the inert gas input pipe to the purge.

[0019] By adopting the above technical solution, the purger uses the inert gas output from the inert gas inlet pipe to purge the interior of the oxygen analyzer housing, maintaining a constant positive pressure inside the oxygen analyzer and preventing flammable gas from entering the oxygen analyzer and coming into contact with electrical components, potentially causing an explosion. The purger also detects the combustible gas content in the purged exhaust gas output by the oxygen analyzer, providing a timely warning when abnormal combustible gas levels are detected, further enhancing system safety. Furthermore, a third pressure reducing valve, located on the inert gas inlet pipe, limits the gas pressure output from the inert gas inlet pipe to the purger, ensuring a stable inert gas pressure entering the purger. This makes the purge process more stable and reliable, thereby ensuring the stable operation of the oxygen analyzer.

[0020] Optionally, it also includes an emission module, which includes a discharge pipe, a flame arrester and a first control valve; the discharge pipe is provided with an atmospheric discharge port and a condensate discharge port, and the exhaust gas output end of the chromatograph and the exhaust gas output end of the oxygen analyzer are both connected to the discharge pipe; the flame arrester is arranged at the atmospheric discharge port; the first control valve is arranged at the condensate discharge port; the bypass output end of the second filter is connected to a liquid storage tank, the output end of the liquid storage tank is connected to a second control valve, and the end of the second control valve facing away from the liquid storage tank is connected to the discharge pipe.

[0021] By adopting this technical solution, the exhaust gases generated by the chromatograph and oxygen analyzer after analyzing the sample gas are output to the exhaust pipe and discharged through the atmospheric exhaust port. Condensate generated by the condensation of these exhaust gases is collected in the exhaust pipe and discharged through the condensate discharge port. The flame arrester prevents safety incidents such as flashback during the exhaust gas discharge process, thereby improving system safety. The first control valve facilitates the control of condensate discharge. The liquid storage tank collects the waste liquid discharged from the bypass output of the second filter. The second control valve controls the flow of liquid from the liquid storage tank into the exhaust pipe, facilitating the collection of waste liquid for centralized discharge. This makes the discharge process of the entire online analysis system more orderly and efficient, reduces the impact of emission issues on system stability and safety, and reduces system maintenance costs.

[0022] Optionally, a cabinet is further included, in which the pretreatment module, chromatography analysis module, oxygen analysis module and exhaust module are all installed; and a heater is provided in the cabinet.

[0023] By adopting the above technical solution, the pretreatment module, chromatography analysis module, oxygen analysis module and emission module are installed in the cabinet, which is conducive to integrated layout and easy to manage and maintain; a heater is installed in the cabinet to prevent moisture condensation in the gas in the system, ensuring that the system operates stably in a suitable temperature environment, further improving the stability and safety of the system.

[0024] Optionally, the sampling module includes a sampling probe, a gate valve and a heating pipe; one end of the sampling probe is connected to the coke oven gas output pipe of the coke oven gas production line, and the other end is connected to the gate valve; one end of the heating pipe is connected to the end of the gate valve away from the sampling probe, and the other end is connected to the steady flow filter unit.

[0025] By adopting the above technical solution, the sampling probe can collect sample gas from the coke oven gas output pipe; the gate valve can control the flow of sample gas, so as to cut off the sample gas input during system maintenance; the heating pipe can prevent the sample gas from condensing due to temperature changes during transmission, ensuring that the sample gas is stably delivered to the steady flow filtration unit, further improving the stability and safety of the system.

[0026] In summary, this application has the following beneficial technical effects: 1. When online analysis of coke oven gas is required, the sampling module continuously collects a large flow of sample gas from the coke oven gas production line and outputs it to the pretreatment module. The pretreatment module's steady-flow filtration unit briefly filters water and particulate matter from the sample gas before feeding it into the fast-loop unit, chromatographic analysis module, and oxygen analysis module. The chromatographic analysis module analyzes the composition of elements such as H2, N2, CH4, and CnHm in the sample gas, while the oxygen analysis module analyzes the oxygen content in the sample gas. The presence of the first and second flowmeters limits the flow of sample gas entering the chromatographic analysis and oxygen analysis modules. Excess sample gas output from the steady-flow filtration unit is fed back to the coke oven gas production line via the fast-loop unit. This ensures that the sample gas flow rate and velocity remain high while meeting the input requirements of the chromatographic analysis and oxygen analysis modules. This significantly reduces the residence time of the sample gas in the transmission pipeline, minimizes sample gas condensation, and reduces the probability of pipeline blockage. This improves the stability and safety of the entire system and reduces maintenance costs. The system also has simple pre-processing steps, which reduces the retention of sample gas in the transmission pipeline and ensures the real-time and accuracy of the analysis results. 2. The first filter preliminarily filters particulate matter in the sample gas to prevent it from entering subsequent components and causing damage to components or clogging of pipelines; the first pressure reducing valve reduces the pressure of the collected sample gas to ensure that subsequent components operate at the appropriate pressure and guarantee system safety; the second filter filters water and particulate matter in the sample gas to further purify the sample gas and prevent water and particulate matter in the sample gas from damaging the chromatograph and oxygen analyzer, thereby improving the accuracy of subsequent analysis. The return pipe of the fast loop unit can return the remaining sample gas to the low-pressure area of ​​the coke oven gas production line to avoid waste and form a cycle in the system; the setting of the one-way valve can prevent the coke oven gas production line from accidentally inputting sample gas into the steady flow filter unit through the return pipe, causing system failure or equipment damage; 3. The pneumatic valve can only be opened and sample gas can enter the oxygen analyzer when reference gas is output. This prevents distortion of the oxygen analyzer's measurement results and sensor poisoning and damage caused by the sample gas being input alone. It also avoids explosions caused by contact between the high concentration of combustible components in coke oven gas and the components within the oxygen analyzer, thereby improving the stability and safety of system operation. Furthermore, if the oxygen analyzer deviates from its use over time, the second and third three-way control valves can be switched to input reference gas with zero oxygen content and span gas with a predicted oxygen content into the oxygen analyzer. This calibrates the maximum and minimum oxygen content detection values ​​of the oxygen analyzer, ensuring the accuracy and reliability of the oxygen analyzer's analysis results. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of an embodiment of the present application.

[0028] Figure 2 This is a schematic diagram of the interior of the cabinet according to an embodiment of the present application.

[0029] Figure 3 It mainly displays the internal structure of the cabinet.

[0030] Explanation of reference numerals: 100, coke oven gas production line; 1, sampling module; 11, sampling probe; 12, gate valve; 13, heating pipe; 2, pretreatment module; 21, steady flow filtration unit; 211, first filter; 212, first pressure reducing valve; 213, second filter; 22, fast loop unit; 221, return pipe; 222, one-way valve; 223, safety valve; 3, chromatography analysis module; 31, chromatographic analyzer; 32, first flow meter; 33, third filter; 34, carrier gas inlet pipe; 35, first calibration unit; 351, first three-way control valve; 352, chromatography standard gas inlet pipe; 36, first purge unit; 361, instrument air inlet pipe; 36 2. Fourth filter; 4. Oxygen analysis module; 41. Oxygen analyzer; 42. Second flowmeter; 43. Second pressure reducing valve; 44. Fifth filter; 45. Second calibration unit; 451. Reference gas inlet pipe; 452. Span gas inlet pipe; 453. Pneumatic valve; 454. Second three-way control valve; 455. Third three-way control valve; 46. Second purge unit; 461. Purge device; 462. Inert gas inlet pipe; 463. Third pressure reducing valve; 5. Discharge module; 51. Discharge pipe; 511. Atmospheric discharge port; 512. Condensate discharge port; 52. Flame arrester; 53. First control valve; 54. Liquid storage tank; 55. Second control valve; 6. Cabinet; 7. Heater. DETAILED DESCRIPTION

[0031] The following combination Figure 1-Figure 3 This application is described in further detail.

[0032] The embodiment of the present application discloses an online analysis system applied to a coke oven gas production line.

[0033] Reference Figure 1 and Figure 2 In this embodiment, the online analysis system includes a sampling module 1, a pretreatment module 2, a chromatographic analysis module 3, an oxygen analysis module 4, an emission module 5, and a cabinet 6. The sampling module 1 is used to connect to the coke oven gas production line 100 and collect sample gas.

[0034] The pretreatment module 2 includes a steady flow filter unit 21 and a fast loop unit 22; the steady flow filter unit 21 is connected to the sampling module 1, used to reduce the pressure of the sample gas and filter water and particulate matter in the sample gas before outputting it; the fast loop unit 22 is used to connect the steady flow filter unit 21 and the coke oven gas production line 100.

[0035] The chromatographic analysis module 3 includes a chromatographic analyzer 31 and a first flowmeter 32 ; the chromatographic analyzer 31 is connected to the steady flow filter unit 21 via the first flowmeter 32 ; the first flowmeter 32 is used to limit the sample gas flow output from the steady flow filter unit 21 to the chromatographic analyzer 31 .

[0036] Oxygen analysis module 4 includes an oxygen analyzer 41 and a second flowmeter 42. Oxygen analyzer 41 is connected to steady-flow filter unit 21 via second flowmeter 42. Second flowmeter 42 is used to limit the flow of sample gas output from steady-flow filter unit 21 to oxygen analyzer 41. Remaining sample gas from steady-flow filter unit 21 that is not output to chromatograph 31 and oxygen analyzer 41 is returned to coke oven gas production line 100 via fast loop unit 22.

[0037] In this way, when online analysis of coke oven gas is required, the sampling module 1 continuously collects a large flow of sample gas from the coke oven gas production line 100 and then outputs it to the pretreatment module 2. After a simple filtration of water and particulate matter in the sample gas using the steady flow filter unit 21 in the pretreatment module 2, the sample gas is input into the fast loop unit 22, the chromatographic analysis module 3, and the oxygen analysis module 4. The chromatographic analysis module 3 analyzes the components of elements such as H2, N2, CH4, and CnHm in the sample gas, and the oxygen analysis module 4 analyzes the oxygen content in the sample gas. Due to the presence of the first flowmeter 32 and the second flowmeter 42, the flow of sample gas entering the chromatographic analysis module 3 and the oxygen analysis module 4 is limited, and the excess sample gas output from the steady flow filter unit 21 is returned to the coke oven gas production line 100 through the fast loop unit 22. This ensures that the sample gas flow rate and velocity remain high while meeting the input requirements of the chromatographic analysis module 3 and the oxygen analysis module 4. This significantly shortens the sample gas's residence time in the transmission pipeline, reduces sample gas condensation, and reduces the probability of pipeline blockage. This improves the stability and safety of the entire system and reduces maintenance costs. Furthermore, the system's simplified pretreatment steps minimize sample gas retention in the transmission pipeline, ensuring real-time and accurate analysis results.

[0038] Reference Figure 1 and Figure 2 In this embodiment, the module includes a sampling probe 11, a gate valve 12, and a heat tracing pipe 13. The sampling probe 11 is typically made of a high-temperature, corrosion-resistant metal material, such as stainless steel. One end of the sampling probe 11 is connected to the coke oven gas output pipe of the coke oven gas production line 100 and is inserted into the coke oven gas pipeline to collect sample gas. The other end is connected to the gate valve 12. The gate valve 12 controls the on / off function of the sampling process, making it convenient to cut off the sample gas input during system maintenance and overhaul.

[0039] One end of the heating pipe 13 is connected to the end of the gate valve 12 facing away from the sampling probe 11, and the other end is connected to the flow-stabilizing filter unit 21. The heating pipe 13 can be heated electrically or steam-heated to prevent moisture in the sample gas from condensing during transmission, ensuring stable delivery of the sample gas to the flow-stabilizing filter unit 21. The heating pipe 13 can also be replaced by other pipes with insulation functions, such as ordinary pipes wrapped in insulation material.

[0040] Reference Figure 2 and Figure 3In this embodiment, the steady-flow filtration unit 21 includes a first filter 211, a first pressure-reducing valve 212, and a second filter 213. The first filter 211 is typically a mesh filter, with its input end connected to the end of the heat tracing pipe 13 facing away from the gate valve 12, and its output end connected to the input end of the first pressure-reducing valve 212. The mesh of the first filter 211 can be selected from various pore sizes as needed to filter larger particles, such as dust, from the sample gas, preventing them from entering subsequent components and causing damage or pipeline blockage.

[0041] The output of first pressure-reducing valve 212 is connected to the input of second filter 213. First pressure-reducing valve 212 can reduce the pressure of the sample gas to an appropriate range, ensuring the safe operation of subsequent equipment. The main output of second filter 213 is connected to the input of first flowmeter 32 and the input of second flowmeter 42. Second filter 213 can be a composite filter that can filter both water and remaining particulate matter from the sample gas, further purifying the sample gas, preventing damage to chromatograph analyzer 31 and oxygen analyzer 41 caused by water and particulate matter in the sample gas, and improving the accuracy of subsequent analysis.

[0042] The fast loop unit 22 includes a return pipe 221, a one-way valve 222 and a safety valve 223. The return pipe 221 connects the bypass output end of the second filter 213 and the low-pressure area on the coke oven gas production line 100 to return the remaining sample gas that has not yet been output to the chromatograph 31 and the oxygen analyzer 41 to the low-pressure area of ​​the coke oven gas production line 100, thereby avoiding waste and forming a cycle in the system. The one-way valve 222 is provided on the return pipe 221. The one-way valve 222 generally adopts a spring-loaded one-way valve, which is used to allow the second filter 213 to output sample gas to the coke oven gas production line 100 in a one-way manner, thereby preventing the coke oven gas production line 100 from reversely inputting sample gas into the steady flow filter unit 21 through the return pipe 221 in an unexpected situation, thereby causing system failure or equipment damage. The input end of the safety valve 223 is connected to the output end of the first pressure reducing valve 212, and the input end of the safety valve 223 is connected to the return pipe 221. It should be noted that the main output end of the second filter 213 outputs the sample gas further filtered by the second filter 213 , and the bypass output end of the second filter 213 outputs the sample gas not filtered by the second filter 213 and the waste liquid generated by the second filter 213 .

[0043] Reference Figure 2 and Figure 3 In this embodiment, the chromatographic analysis module 3 further includes a third filter 33 , a carrier gas input pipe 34 , a first calibration unit 35 and a first purge unit 36 ​​.

[0044] The third filter 33, typically a high-precision mesh filter, is connected between the first flowmeter 32 and the chromatograph 31. Its input is connected to the output of the first flowmeter 32, while its output is connected to the sample gas output of the chromatograph 31. The third filter 33 further filters out tiny particles from the sample gas, preventing them from entering the chromatograph 31 and damaging internal components, thereby improving the lifespan and analytical accuracy of the chromatograph 31. A carrier gas inlet pipe 34 connects an external carrier gas bottle to the first carrier gas input of the chromatograph 31, providing carrier gas to the chromatograph 31 and ensuring proper chromatographic analysis.

[0045] The first calibration unit 35 includes a first three-way control valve 351 and a chromatographic standard gas input tube 352. The three ports of the first three-way control valve 351 are connected to the main output of the second filter 213, the input of the first flowmeter 32, and the chromatographic standard gas input tube 352, respectively. By controlling the first three-way control valve 351, the gas input to the chromatograph 31 can be switched between sample gas and chromatographic standard gas. This ensures that the chromatographic analysis can proceed normally when the chromatograph 31 is operating normally, ensuring the carrier gas input. If the chromatograph 31 loses accuracy after long-term use, a standard gas with a known component content is injected into the chromatograph 31 for calibration analysis to ensure the accuracy and reliability of the analysis results of the chromatograph 31.

[0046] The first purge unit 36 ​​includes an instrument air inlet pipe 361 and a fourth filter 362. The input end of the instrument air inlet pipe 361 is connected to an external air compressor for air input, while the output end of the instrument air inlet pipe 361 is connected to the purge gas inlet and the second carrier gas inlet of the chromatograph 31. By supplying air to the purge gas inlet of the chromatograph 31, a positive pressure is maintained within the housing of the chromatograph 31, preventing flammable gases from entering the chromatograph 31 and coming into contact with electrical components, potentially causing explosions. By supplying air to the second carrier gas inlet of the chromatograph 31 as a combustion-supporting gas, the oxygen contained in the air assists the combustion of the hydrogen output from the carrier gas inlet pipe 34, ensuring proper chromatographic analysis.

[0047] The fourth filter 362 is provided on the instrument air inlet pipe 361 and is used to filter the air input from the instrument air inlet pipe 361 to improve the cleanliness of the air and prevent impurities in the air from entering the chromatograph 31 and damaging components, thereby improving the stability and safety of the system operation.

[0048] Reference Figure 2 and Figure 3In this embodiment, the oxygen analysis module 4 further includes a second pressure reducing valve 43, a fifth filter 44, a second calibration unit 45, and a second purge unit 46. The second pressure reducing valve 43 is connected between the second filter 213 and the second flowmeter 42 to further limit the pressure of the sample gas output from the second filter 213 to the second flowmeter 42, thereby improving the stability of the sample gas pressure and ensuring the safe operation of the oxygen analyzer 41.

[0049] The fifth filter 44 is generally a high-precision mesh filter. The fifth filter 44 is connected between the second flow meter 42 and the oxygen analyzer 41 to further filter tiny particles in the sample gas, prevent particles from entering the oxygen analyzer 41 and damaging internal components, and improve the service life and analysis accuracy of the oxygen analyzer 41.

[0050] The second calibration unit 45 is connected to the oxygen analyzer 41 for calibrating the oxygen analyzer 41 and inputting carrier gas into the oxygen analyzer 41. The second calibration unit 45 includes a reference gas input pipe 451, a range gas input pipe 452, a pneumatic valve 453, a second three-way control valve 454 and a third three-way control valve 455.

[0051] The input end of the reference gas input tube 451 is connected to an external reference gas cylinder, and the output end of the reference gas input tube 451 is connected to the reference gas input end of the oxygen analyzer 41. A pneumatic valve 453 is connected between the fifth filter 44 and the oxygen analyzer 41 to control the on / off flow of the sample gas into the oxygen analyzer 41. The input end of the fifth filter 44 is connected to the output end of the second flowmeter 42, and the output end of the fifth filter 44 is connected to the input end of the pneumatic valve 453. The output end of the pneumatic valve 453 is connected to the sample gas input end of the oxygen analyzer 41. The pneumatic control end of the pneumatic valve 453 is connected to the output end of the reference gas input tube 451, and the input end of the reference gas input tube 451 is connected to the external reference gas cylinder.

[0052] The first port and the second port of the second three-way control valve 454 are respectively connected to the main output end of the second filter 213 and the input end of the second pressure reducing valve 43, the first port and the second port of the third three-way control valve 455 are respectively connected to the output ends of the reference gas input pipe 451 and the range gas input pipe 452, the input end of the range gas input pipe 452 is connected to the external range gas cylinder, and the third port of the second three-way control valve 454 is connected to the third port of the third three-way control valve 455.

[0053] In this way, the pneumatic valve 453 can only be opened when the reference gas is output, and the sample gas can enter the oxygen analyzer 41 from the sample gas input port of the oxygen analyzer 41. This prevents the sample gas from being input alone into the oxygen analyzer 41, which may cause distortion of the measurement results of the oxygen analyzer 41 and damage to the sensor, thereby improving the stability and safety of the system operation. At the same time, when the oxygen analyzer 41 has been used for a long time and has developed deviations, the second three-way control valve 454 and the third three-way control valve 455 are switched to input the reference gas with zero oxygen content and the span gas with a predicted oxygen content into the oxygen analyzer 41, calibrating the maximum and minimum oxygen content detection values ​​of the oxygen analyzer 41, thereby ensuring the accuracy and reliability of the analysis results of the oxygen analyzer 41.

[0054] The second purge unit 46 is used to purge the inside of the shell of the oxygen analyzer 41. The second purge unit 46 includes a purge 461, an inert gas input pipe 462 and a third pressure reducing valve 463. The input end of the inert gas input pipe 462 is connected to an external inert gas cylinder, the input end of the purge 461 is connected to the output end of the inert gas input pipe 462, the output end of the purge 461 is connected to the purge gas input end of the oxygen analyzer 41, and the purge gas output end of the oxygen analyzer 41 is connected to the exhaust gas input end of the purge 461. The purge 461 can detect the combustible gas content in the gas output by the oxygen analyzer 41. The third pressure reducing valve 463 is provided on the inert gas input pipe 462 to limit the gas pressure output from the inert gas input pipe 462 to the purge 461 to ensure the stability of the inert gas pressure entering the purge 461.

[0055] In this way, purge device 461 uses inert gas output from inert gas inlet pipe 462 to purge the interior of the oxygen analyzer 41, maintaining a constant positive pressure inside the oxygen analyzer 41 and preventing combustible gas from entering the oxygen analyzer 41 and coming into contact with electrical components, potentially causing an explosion. Furthermore, if purge device 461 detects an abnormal level of combustible gas in the purged exhaust gas output by the oxygen analyzer 41, it can provide a timely warning, further enhancing system safety.

[0056] Reference Figure 2 and Figure 3 In this embodiment, the discharge module 5 includes a discharge pipe 51, a flame arrester 52, and a first control valve 53. The discharge pipe 51 is specifically a vertically arranged stainless steel pipe. The top and bottom ends of the discharge pipe 51 are respectively provided with an atmospheric discharge port 511 and a condensate discharge port 512. The exhaust gas output end of the chromatograph 31, the exhaust gas output end of the oxygen analyzer 41, and the exhaust gas output end of the purge 461 are all connected to the discharge pipe 51. The exhaust gas generated after the chromatograph 31 and the oxygen analyzer 41 analyze the sample gas, as well as the exhaust gas output from the purge 461, are output into the discharge pipe 51 and discharged through the atmospheric discharge port 511. At the same time, the condensate generated by the condensation of these exhaust gases is collected by the discharge pipe 51 and discharged through the condensate discharge port 512.

[0057] A flame arrester 52 is provided at the atmospheric discharge port 511 of the discharge pipe 51 to prevent backfire of the discharged exhaust gas and improve system safety. A first control valve 53 is provided at the condensate discharge port 512 of the discharge pipe 51 to control the discharge of condensate, thereby achieving regular discharge of accumulated condensate in the discharge pipe 51.

[0058] The bypass output of second filter 213 is also connected to a liquid storage tank 54, which is used to collect the waste liquid separated by second filter 213. The output of liquid storage tank 54 is connected to drain pipe 51. A second control valve 55 is provided between the output of liquid storage tank 54 and drain pipe 51 to facilitate control of liquid discharge. Liquid storage tank 54 can be a visual storage tank 54 to facilitate monitoring of the amount of waste liquid in tank 54.

[0059] Reference Figure 2 and Figure 3 In this embodiment, pretreatment module 2, chromatographic analysis module 3, oxygen analysis module 4, and exhaust module 5 are all installed in a cabinet 6. Cabinet 6 protects and integrates the modules, facilitating management and maintenance. A heater 7, which can be an electric heater, is installed within cabinet 6 to ensure stable system operation at a suitable temperature, prevent moisture condensation in the sample gas from affecting normal system operation, and further improve system stability and safety.

[0060] The implementation principle of an online analysis system for use in a coke oven gas production line according to an embodiment of the present application is as follows: When online analysis of coke oven gas is required, the sampling module 1 continuously collects a large flow of sample gas from the coke oven gas production line 100 and then outputs it to the pretreatment module 2. The steady-flow filter unit 21 in the pretreatment module 2 briefly filters water and particulate matter from the sample gas before inputting the sample gas into the fast loop unit 22, the chromatographic analysis module 3, and the oxygen analysis module 4. The chromatographic analysis module 3 analyzes the components of elements such as H2, N2, CH4, and CnHm in the sample gas, while the oxygen analysis module 4 analyzes the oxygen content in the sample gas. Due to the presence of the first flowmeter 32 and the second flowmeter 42, the flow rate of the sample gas entering the chromatographic analysis module 3 and the oxygen analysis module 4 is limited. Excess sample gas output from the steady-flow filter unit 21 is returned to the coke oven gas production line 100 via the fast loop unit 22. This ensures that the sample gas flow rate and velocity remain high while meeting the input requirements of the chromatographic analysis module 3 and the oxygen analysis module 4. This significantly shortens the sample gas's residence time in the transmission pipeline, reduces sample gas condensation, and reduces the probability of pipeline blockage. This improves the stability and safety of the entire system and reduces maintenance costs. Furthermore, the system's simplified pretreatment steps minimize sample gas retention in the transmission pipeline, ensuring real-time and accurate analysis results.

[0061] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. An online analysis system used in a coke oven gas production line, characterized in that: include: A sampling module (1) is used to connect to the coke oven gas production line (100) and collect sample gas; A pretreatment module (2), the pretreatment module (2) comprising a steady flow filter unit (21) and a fast loop unit (22); the steady flow filter unit (21) is connected to the sampling module (1) and is used to reduce the pressure of the sample gas and filter water and particulate matter in the sample gas before outputting it; the fast loop unit (22) is used to connect the steady flow filter unit (21) and the coke oven gas production line (100); A chromatographic analysis module (3), the chromatographic analysis module (3) comprising a chromatographic analyzer (31) and a first flow meter (32); the chromatographic analyzer (31) is connected to the steady flow filter unit (21) via the first flow meter (32); the first flow meter (32) is used to limit the flow rate of the sample gas output from the steady flow filter unit (21) to the chromatographic analyzer (31); An oxygen analysis module (4), the oxygen analysis module (4) comprising an oxygen analyzer (41) and a second flow meter (42); the oxygen analyzer (41) is connected to the steady flow filter unit (21) via the second flow meter (42); the second flow meter (42) is used to limit the flow of sample gas output from the steady flow filter unit (21) to the oxygen analyzer (41); the remaining sample gas in the steady flow filter unit (21) that is not output to the chromatographic analyzer (31) and the oxygen analyzer (41) is returned to the coke oven gas production line (100) through the fast loop unit (22).

2. The online analysis system for use in a coke oven gas production line according to claim 1, characterized in that: The steady flow filtering unit (21) comprises a first filter (211), a first pressure reducing valve (212) and a second filter (213); the input end of the first filter (211) is connected to the sampling module (1), the output end of the first filter (211) is connected to the input end of the first pressure reducing valve (212), and the first filter (211) is used to filter particulate matter in the sample gas; the output end of the first pressure reducing valve (212) is connected to the input end of the second filter (213), and the second filter (213) is used to filter the sample gas. The invention relates to a method for filtering water and particulate matter in the gas, wherein the main output end of the second filter (213) is connected to the first flow meter (32) and the second flow meter (42); the fast loop unit (22) comprises a return pipe (221) and a one-way valve (222); the return pipe (221) is used to connect the bypass output end of the second filter (213) and the coke oven gas production line (100); the one-way valve (222) is provided on the return pipe (221) to enable the second filter (213) to output one-way to the coke oven gas production line (100).

3. The online analysis system for use in a coke oven gas production line according to claim 2, characterized in that: The chromatographic analysis module (3) further comprises a third filter (33), a carrier gas input pipe (34), a first calibration unit (35) and a first purge unit (36); the third filter (33) is connected between the first flow meter (32) and the chromatographic analyzer (31) and is used to filter particulate matter in the sample gas; the carrier gas input pipe (34) is used to be connected to the first carrier gas input end of the chromatographic analyzer (31); the first calibration unit (35) is connected to the chromatographic analyzer (31) and is used to calibrate the chromatographic analyzer (31); and the first purge unit (36) is used to purge the interior of the housing of the chromatographic analyzer (31).

4. The online analysis system for use in a coke oven gas production line according to claim 3, characterized in that: The first calibration unit (35) includes a first three-way control valve (351) and a chromatographic calibration gas input pipe (352); the three ports of the first three-way control valve (351) are respectively connected to the main output end of the second filter (213), the input end of the first flow meter (32) and the chromatographic calibration gas input pipe (352); the first purge unit (36) includes an instrument air input pipe (361) and a fourth filter (362), the instrument air input pipe (361) is connected to the purge gas input end and the second carrier gas input end of the chromatographic analyzer (31); the fourth filter (362) is arranged on the instrument air input pipe (361).

5. The online analysis system for use in a coke oven gas production line according to claim 2, characterized in that: The oxygen analysis module (4) further comprises a second pressure reducing valve (43), a fifth filter (44), a second calibration unit (45) and a second purge unit (46); the second pressure reducing valve (43) is connected between the second filter (213) and the second flow meter (42) and is used to limit the pressure of the sample gas output from the second filter (213) to the second flow meter (42); The fifth filter (44) is connected between the second flow meter (42) and the oxygen analyzer (41) and is used to filter particulate matter in the sample gas; the second calibration unit (45) is connected to the oxygen analyzer (41) and is used to calibrate the oxygen analyzer (41) and input carrier gas into the oxygen analyzer (41); the second purge unit (46) is used to purge the interior of the housing of the oxygen analyzer (41).

6. The online analysis system for use in a coke oven gas production line according to claim 5, characterized in that: The second calibration unit (45) includes a reference gas input pipe (451), a range gas input pipe (452), a pneumatic valve (453), a second three-way control valve (454) and a third three-way control valve (455); the reference gas input end of the oxygen analyzer (41) is connected to the reference gas input pipe (451), the pneumatic valve (453) is connected between the fifth filter (44) and the oxygen analyzer (41), and is used to control the on-off of the sample gas input to the oxygen analyzer (41). The pneumatic valve (453) The pneumatic control end of the second three-way control valve (454) is connected to the reference gas input pipe (451); the first port and the second port of the second three-way control valve (454) are respectively connected to the main output end of the second filter (213) and the input end of the second pressure reducing valve (43); the first port and the second port of the third three-way control valve (455) are respectively connected to the reference gas input pipe (451) and the range gas input pipe (452); the third port of the second three-way control valve (454) is connected to the third port of the third three-way control valve (455).

7. The online analysis system for use in a coke oven gas production line according to claim 5, characterized in that: The second purge unit (46) includes a purge (461), an inert gas input pipe (462) and a third pressure reducing valve (463); the input end of the purge (461) is connected to the inert gas input pipe (462), the output end of the purge (461) is connected to the purge gas input end of the oxygen analyzer (41), the purge gas output end of the oxygen analyzer (41) is connected to the exhaust gas input end of the purge (461), and the purge (461) is capable of detecting the combustible gas content in the gas output by the oxygen analyzer (41); the third pressure reducing valve (463) is arranged on the inert gas input pipe (462) to limit the gas pressure output from the inert gas input pipe (462) to the purge (461).

8. The online analysis system for use in a coke oven gas production line according to claim 2, characterized in that: The invention also includes a discharge module (5), wherein the discharge module (5) includes a discharge pipe (51), a flame arrester (52) and a first control valve (53); the discharge pipe (51) is provided with an atmospheric discharge port (511) and a condensate discharge port (512); the exhaust gas output end of the chromatographic analyzer (31) and the exhaust gas output end of the oxygen analyzer (41) are both connected to the discharge pipe (51); the flame arrester (52) is arranged at the atmospheric discharge port (511); the first control valve (53) is arranged at the condensate discharge port (512); the bypass output end of the second filter (213) is connected to a liquid storage tank (54), the output end of the liquid storage tank (54) is connected to a second control valve (55), and the end of the second control valve (55) facing away from the liquid storage tank (54) is connected to the discharge pipe (51).

9. The online analysis system for use in a coke oven gas production line according to claim 8, characterized in that: It also includes a cabinet (6), wherein the pretreatment module (2), the chromatographic analysis module (3), the oxygen analysis module (4) and the exhaust module (5) are all installed in the cabinet (6); a heater is provided in the cabinet (6).

10. The online analysis system for use in a coke oven gas production line according to claim 1, characterized in that: The sampling module (1) comprises a sampling probe (11), a gate valve (12) and a heat tracing pipe (13); one end of the sampling probe (11) is connected to the coke oven gas output pipe of the coke oven gas production line (100), and the other end is connected to the gate valve (12); one end of the heat tracing pipe (13) is connected to the end of the gate valve (12) facing away from the sampling probe (11), and the other end is connected to the steady flow filter unit (21).

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