A measuring device and system for the composition of blast furnace gas

Abstract

The application provides a kind of measuring device and system of blast furnace gas composition, belongs to blast furnace ironmaking technical field, measuring device is installed at the manhole maintenance platform of blast furnace top, measuring device includes: gas analysis unit, and the gas sampling unit, gas treatment unit connected with gas analysis unit respectively;Gas sampling unit is used to collect the first gas discharged by the top exhaust duct of blast furnace at regular intervals, and the first gas is pretreated to obtain the second gas, and the second gas is output to the gas analysis unit;Gas analysis unit is used to analyze the concentration value of target gas in the second gas, and the concentration value of target gas is output to the data processing platform for processing, and the second gas after analysis is discharged to the gas treatment unit;Gas treatment unit is used for combustion treatment of the second gas discharged by gas analysis unit. Through the measuring device provided by the application, the problem of discontinuous detection caused by manual sampling can be overcome.

Description

Technical Field

[0001] This invention belongs to the field of blast furnace ironmaking technology, specifically relating to a measuring device and system for blast furnace gas composition. Background Technology

[0002] Blast furnace burden reduction is a special operation performed before a blast furnace shutdown for major overhaul or long-term stagnation. The lower part continues to be blasted while no burden is added to the upper part, allowing the burden level to gradually decrease towards the tuyeres. To prevent high-temperature gas from burning the furnace top equipment, water is typically pumped into the furnace top and the blast volume is adjusted to control the temperature. However, pumping water at high temperatures can trigger a water decomposition reaction, producing hydrogen and oxygen. When these gases reach a certain concentration, there is a risk of explosion; therefore, the composition of the gas must be monitored.

[0003] The current detection method involves connecting a flexible hose to the gas intake point on the furnace top riser pipe, leading the gas to the tuyere platform, and manually sampling every 30-60 minutes using an airbag before sending it to the laboratory for analysis. This method has the following drawbacks: discontinuous detection, inability to reflect real-time changes in gas composition, and a significant explosion hazard; long-distance gas intake pipelines are prone to blockage by moisture and dust, and leaks can lead to personnel poisoning; inconsistent manual sampling techniques result in large measurement errors, and there is also a risk of poisoning during sampling and transportation. Summary of the Invention

[0004] In view of the above problems, embodiments of this application provide a device and system for measuring the composition of blast furnace gas, so as to overcome the above problems or at least partially solve the above problems.

[0005] In a first aspect of this application, a device for measuring the composition of blast furnace gas is provided. The device is installed at the maintenance platform of the manhole on the top of the blast furnace. The device includes a gas analysis unit, a gas sampling unit, and a gas processing unit, which are respectively connected to the gas analysis unit. The gas sampling unit is used to periodically collect the first gas discharged from the blast furnace top exhaust pipe, pre-treat the first gas to obtain the second gas, and output the second gas to the gas analysis unit; wherein, the pre-treatment includes at least removing moisture and dust from the first gas; the gas analysis unit is used to analyze and obtain the concentration value of the target gas in the second gas, output the concentration value of the target gas to the data processing platform for processing, and discharge the analyzed second gas to the gas processing unit; wherein, the target gas includes at least H2 and O2; the gas processing unit is used to perform combustion treatment on the second gas discharged from the gas analysis unit.

[0006] In some embodiments, the gas sampling unit includes: a refrigerated dryer, a first electric ball valve, a first sampling tube, and a second sampling tube. A first end of the first sampling tube is connected to the refrigerated dryer, a second end of the first sampling tube is connected to the furnace top exhaust pipe, a first end of the second sampling tube is connected to the refrigerated dryer, and a second end of the second sampling tube is connected to the gas analysis unit. The first electric ball valve is disposed on the first sampling tube and is used to control the opening and closing of the first sampling pipe and the flow rate of the first gas entering the refrigerated dryer.

[0007] In some embodiments, the gas sampling unit further includes a second electric ball valve and a silica gel moisture absorbent disposed on the second sampling tube, wherein the silica gel moisture absorbent is disposed between the second electric ball valve and the gas analysis unit; wherein the second electric ball valve is used to control the flow rate of the second gas entering the gas analysis unit; and the silica gel moisture absorbent is used to absorb moisture and dust in the second gas.

[0008] In some embodiments, the gas sampling unit further includes an automatic drain valve connected to the condensate outlet of the refrigerated dryer, the automatic drain valve being used to discharge the mixture of moisture and dust condensed in the first gas.

[0009] In some embodiments, the gas analysis unit includes an infrared analyzer and a thermal conductivity gas analyzer. The infrared analyzer is used to determine the concentration values ​​of CO, CO2, O2 and CH4 in the second coal gas. The thermal conductivity gas analysis unit is used to analyze the concentration value of H2 in the second coal gas.

[0010] In some embodiments, the gas treatment unit includes an exhaust pipe and an ignition device. The exhaust pipe is connected to the gas analysis unit and the ignition device, respectively. The ignition device is used to perform combustion treatment on the gas discharged from the gas analysis unit through the exhaust pipe.

[0011] A second aspect of this application provides a blast furnace gas composition measurement system. The measurement system includes the measuring device described in the first aspect of this application, and a data processing platform communicatively connected to the measuring device. The data processing platform receives the concentration value of a target gas output by the measuring device and compares the concentration value of the target gas with a preset concentration threshold of the target gas. If the concentration value of the target gas exceeds the preset concentration threshold, the platform reduces the concentration value of the target gas through a control strategy. The control strategy executes at least one of the following strategies: reducing or stopping water injection in the blast furnace, reducing the blast furnace blast volume, or increasing the nitrogen injection volume in the blast furnace.

[0012] In some embodiments, if the concentration of the target gas exceeds the preset concentration threshold, the concentration of the target gas is reduced by a control strategy, including: reducing or stopping the water injection in the blast furnace, and re-measuring the concentration of the target gas after a first preset time period; if the concentration of the target gas still exceeds the preset concentration threshold, reducing the blast furnace blast rate, and re-measuring the concentration of the target gas after a second preset time period; if the concentration of the target gas still exceeds the preset concentration threshold, increasing the nitrogen injection rate into the blast furnace.

[0013] In some embodiments, the H2 concentration value is 8% and the O2 concentration value is 0.8% in the preset concentration threshold.

[0014] In some embodiments, the measurement system further includes: a display interface and an alarm unit, the display interface and the alarm unit being respectively connected to the data processing unit; wherein, the display interface is used to display a concentration value curve of each gas component in the gas analysis unit changing over time; the alarm unit is used to issue an alarm signal when the concentration value of the target gas exceeds the preset concentration threshold.

[0015] This embodiment provides a blast furnace gas composition measuring device. The device is installed at the blast furnace top manhole maintenance platform, eliminating the need for a hose from the furnace top to the tuyeres platform. This completely eliminates the risk of blockage due to moisture and dust in long-distance gas pipelines, and also prevents gas leaks along the pipeline that could lead to personnel poisoning. The gas sampling unit periodically collects the first gas discharged from the blast furnace top exhaust pipe, pre-treats it to obtain a second gas, and then outputs the second gas to the gas analysis unit. The pre-treatment includes at least removing moisture and dust from the first gas. The gas analysis unit analyzes the concentration of target gases in the second gas, which include at least H2 and O2. This overcomes the problem of discontinuous detection caused by manual sampling every 30-60 minutes in existing technologies, enabling timely detection and early warning of excessive gas composition, effectively preventing hydrogen-oxygen mixture explosions. The gas analysis unit also outputs the concentration values ​​of the target gas to the data processing platform for processing. This eliminates the need for manual contact with the gas, avoiding measurement errors caused by inconsistent manual sampling methods and eliminating the risk of carbon monoxide poisoning during sampling and transportation. Simultaneously, the analyzed second gas is discharged to the gas treatment unit. The gas treatment unit is used to combust the second gas discharged from the gas analysis unit, preventing environmental pollution caused by the direct emission of untreated exhaust gas. Attached Figure Description To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the installation position of a blast furnace gas composition measuring device provided in an embodiment of this application; Figure 2 This is a schematic diagram of a blast furnace gas composition measuring device provided in an embodiment of this application. Detailed Implementation

[0017] Exemplary embodiments of this application will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of this application are shown in the drawings, it should be understood that this application may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of this application and to fully convey the scope of this application to those skilled in the art.

[0018] Blast furnace charge reduction is a technical term referring to a special operation performed before blast furnace shutdown for wall painting, long-term furnace closure, or major overhaul. Strictly speaking, it involves lowering the furnace charge; that is, the lower part continues blasting while no charge is added to the upper part, allowing the charge to gradually melt and the charge level to slowly decrease to the tuyeres. During blast furnace charge reduction, since no more charge is added, the gas from the lower part rises directly to the top of the blast furnace without cooling the charge. Therefore, the temperature at the top will gradually increase as the charge level decreases. If not controlled, this could burn out the gas-tight box and other top equipment. Therefore, water injection at the top and adjustment of the blast volume are often used to control the top temperature. However, injecting water at high temperatures can cause a water decomposition reaction, producing hydrogen and oxygen. When the concentration of hydrogen and oxygen reaches a certain level, there is a risk of explosion. Therefore, the composition of the gas must be monitored during charge reduction to ensure safe production. During the blast furnace charge reduction process, gas monitoring is necessary for three reasons: first, to prevent explosions caused by excessively high hydrogen and oxygen concentrations; second, to guide the charge reduction operation by determining the charge reduction position based on gas component concentration values; and third, to monitor gas quality and recover as much gas as possible while ensuring gas quality and safety. The current standard procedure involves connecting a gas hose from the gas riser at the furnace top, lowering it 20-40 meters to the tuyeres platform, where a gas valve is installed. Every 30 minutes or 1 hour, a gas sample is manually taken using a gas bag or similar device, and then sent to a designated location for gas composition analysis using chemical methods or gas chromatography. However, current gas detection methods have the following problems: First, gas detection is not continuous, with one sample taken every 30 minutes, making it impossible to characterize the gas composition inside the furnace in real time, which poses a significant risk of explosion; second, the gas pipeline is led to the vent platform, which does not comply with safety regulations, and the pipeline is easily blocked by water vapor and dust, posing a risk of gas leaks and poisoning to personnel; third, manual gas collection has issues with collection methods and operating habits, making it difficult to guarantee gas purity and resulting in large measurement errors. At the same time, personnel collecting gas are also at risk of gas poisoning during collection and transportation.

[0019] In view of this, the blast furnace gas composition measuring device provided in this embodiment is installed directly at the blast furnace top manhole maintenance platform. The gas sampling unit collects and pre-processes the gas at regular intervals (at least removing moisture and dust), and the gas analysis unit analyzes the concentration values ​​of target gases such as H2 and O2 in the gas in real time and sends them to the data processing platform. At the same time, the gas processing unit performs combustion processing on the analyzed gas, thereby realizing unattended operation and continuous online monitoring at the furnace top, so as to solve the problems of discontinuous detection, easy blockage and leakage of long-distance gas induced flow, and the danger and large error of manual sampling in the prior art.

[0020] The following will describe in detail the blast furnace gas composition measuring device provided in this embodiment using specific examples. Figure 1This is a schematic diagram of the installation position of a blast furnace gas composition measuring device provided in an embodiment of this application. Figure 1 It can be seen that the measuring device is installed at the maintenance platform of the manhole on the top of the blast furnace. Figure 2 This is a schematic diagram of a blast furnace gas composition measuring device provided in an embodiment of this application. Figure 2 It is known that the measuring device includes: a gas analysis unit, and a gas sampling unit and a gas processing unit respectively connected to the gas analysis unit; the gas sampling unit is used to periodically collect the first gas discharged from the blast furnace top exhaust pipe, pre-treat the first gas to obtain the second gas, and output the second gas to the gas analysis unit; wherein, the pre-treatment includes at least removing moisture and dust from the first gas; the gas analysis unit is used to analyze and obtain the concentration value of the target gas in the second gas, output the concentration value of the target gas to the data processing platform for processing, and discharge the analyzed second gas to the gas processing unit; wherein, the target gas includes at least H2 and O2; the gas processing unit is used to perform combustion treatment on the second gas discharged from the gas analysis unit.

[0021] In this embodiment, the gas sampling unit is used to collect the first gas from the gas exhaust pipe at regular intervals (e.g., once every 0.5 to 1 minute). Specifically, a sampling point can be set in the gas exhaust pipe. This sampling point can be connected to the gas sampling unit through the sampling pipe of the gas sampling unit. The gas sampling unit can pre-treat the first gas, which is the gas discharged from the gas exhaust pipe in the top of the blast furnace. The first gas contains a large amount of dust and moisture. In order to ensure the accuracy of the concentration value of the target gas output by the gas analysis unit, the first gas needs to be pre-treated to ensure that the gas entering the gas analysis unit is dry and clean. At the same time, it can also avoid water vapor and dust interfering with the detection accuracy or clogging the pipeline.

[0022] The gas analysis unit can be a gas analyzer, a device used to detect the concentration of multiple gas components in coal gas in real time. The gas analyzer analyzes the concentration of gases in the pre-treated second coal gas to obtain the target gas concentration value. The target gas includes at least H2 and O2, and may also include CO, CO2, CH4, etc., depending on the actual operating conditions. The gas analysis unit can work in conjunction with the sampling frequency of the coal gas sampling unit to continuously and accurately output the concentration data of the target gas in the second coal gas. The gas analysis unit can also transmit the target gas concentration data to a remote data processing platform via a wireless network (such as a mobile network). This enables remote data transmission, allowing operators to view the coal gas composition in real time from the foreman's control room, eliminating the need for on-site manual recording or sample transportation.

[0023] The gas treatment unit processes the second gas discharged from the gas analysis unit. Specifically, it receives the second gas discharged after the gas analysis unit has completed its testing and then performs combustion treatment. This combustion treatment in the gas treatment unit prevents the direct emission of untreated combustible exhaust gases, thus avoiding environmental pollution.

[0024] Using the measuring device provided in this embodiment, the gas sampling unit periodically collects and purifies the gas, the gas analysis unit continuously analyzes the concentration values ​​of H2, O2, etc., and sends them to a remote platform, and the gas treatment unit combusts the tail gas. The entire process operates automatically on the furnace top, without the need for personnel to operate from the furnace top. Operators can view the gas concentration curve in real time through the data processing platform. When the H2 or O2 concentration exceeds the preset safety threshold (e.g., H2 ≥ 8%, O2 ≥ 0.8%), the platform issues an alarm, guiding operators to take measures such as reducing water injection, reducing blast volume, or increasing nitrogen injection, thereby effectively avoiding detonation accidents, ensuring the safety of the material lowering operation, and improving gas recovery efficiency.

[0025] Figure 2 This is a schematic diagram of a blast furnace gas composition measuring device provided in an embodiment of this application. Figure 2 It is known that the gas sampling unit includes: a refrigerated dryer, a first electric ball valve, a first sampling tube, and a second sampling tube. The first end of the first sampling tube is connected to the refrigerated dryer, the second end of the first sampling tube is connected to the furnace top exhaust pipe, the first end of the second sampling tube is connected to the refrigerated dryer, and the second end of the second sampling tube is connected to the gas analysis unit. The first electric ball valve is installed on the first sampling tube and is used to control the opening and closing of the first sampling pipe and the flow rate of the first gas entering the refrigerated dryer.

[0026] In this embodiment, one end of the first sampling tube is connected to the furnace top exhaust pipe, and the other end is connected to the refrigerated dryer, forming the main passage for the first gas collection. A first electric ball valve is installed on the first sampling tube and can be used to remotely control the opening and closing degree of the first electric ball valve, control the on / off state of the first sampling tube, and regulate the gas flow rate entering the refrigerated dryer. Operators can remotely control the opening and closing of the first electric ball valve through a data processing platform to ensure that the gas flow rate remains stable within the reasonable range required by the gas analysis unit (e.g., 5-20 L / min).

[0027] The refrigerated dryer receives the first gas entering through the first sampling tube and cools it to 5-20°C, causing most of the water vapor in the gas to condense into liquid water. Simultaneously, some dust is released along with the condensate, thus achieving preliminary dehydration and dust removal. The gas processed by the refrigerated dryer is then transported through the second sampling tube to the gas analysis unit for further analysis.

[0028] One end of the second sampling tube is connected to a refrigerated dryer, and the other end is connected to a gas analysis unit. As a transport channel for pre-treated coal gas, the coal gas sampling unit can collect coal gas from the furnace top exhaust pipe at regular intervals and in quantitative quantities, and complete efficient dehydration and dust removal, providing dry and clean sample gas for the gas analysis unit, thereby ensuring the accuracy of the test results and the long-term stable operation of the equipment.

[0029] Continue to refer to Figure 2 The gas sampling unit also includes a second electric ball valve and a silica gel moisture absorbent installed on the second sampling tube. The silica gel moisture absorbent is installed between the second electric ball valve and the gas analysis unit. The second electric ball valve is used to control the flow rate of the second gas entering the gas analysis unit. The silica gel moisture absorbent is used to absorb moisture and dust in the second gas.

[0030] In this embodiment, after the gas sampling unit completes preliminary dehydration and dust removal in the refrigerated dryer, it can undergo secondary pretreatment using a silica gel moisture adsorbent. A second electric ball valve is installed on the second sampling tube, located between the refrigerated dryer and the silica gel moisture adsorbent. The operator can remotely adjust the opening of the second electric ball valve through the data processing platform according to the detection requirements of the gas analysis unit, stabilizing the gas flow rate within the optimal range required by the analyzer (e.g., 5-20 L / min) to ensure detection accuracy.

[0031] The silica gel moisture absorbent is placed between the second electric ball valve and the gas analysis unit to adsorb residual moisture and dust in the second coal gas. After condensation treatment in a refrigerated dryer, the coal gas may still contain a small amount of water vapor and fine dust. The silica gel moisture absorbent can further remove these impurities, making the second coal gas entering the gas analysis unit more clean. This avoids interference from water vapor and dust on the analytical instruments, extends the service life of the equipment, and improves the reliability of the test results.

[0032] Through the coordinated control of the first and second electric ball valves, the gas sampling unit can precisely adjust the sampling flow rate; through two-stage dehydration and dust removal using a refrigerated dryer and silica gel moisture adsorbent, the second gas entering the gas analysis unit is ensured to be dry and clean.

[0033] Continue to refer to Figure 2 The gas sampling unit also includes an automatic drain valve connected to the condensate outlet of the refrigerated dryer, which is used to discharge the mixture of moisture and dust condensed in the first gas.

[0034] In this embodiment, an automatic drain valve is connected to the condensate outlet of the refrigerated dryer to automatically discharge the mixture of moisture and dust generated during the condensation of the first gas in the refrigerated dryer. When the refrigerated dryer cools the first gas to 5-20°C, the water vapor in the gas condenses into liquid water, while some dust precipitates out with the condensate and deposits at the bottom of the refrigerated dryer. The automatic drain valve opens automatically at regular intervals or when the liquid level reaches a set value, discharging these condensates into the furnace top water tank or other collection devices, preventing water and dust accumulation from affecting the heat exchange efficiency and normal operation of the refrigerated dryer. By setting an automatic drain valve, automatic discharge of condensates is achieved, eliminating the need for regular manual cleaning, further reducing manual maintenance costs, and ensuring long-term stable unattended operation of the equipment.

[0035] In some embodiments, the gas analysis unit includes an infrared analyzer and a thermal conductivity gas analyzer. The infrared analyzer is used to determine the respective concentration values ​​of CO, CO2, O2 and CH4 in the second gas; the thermal conductivity gas analysis unit is used to analyze the concentration value of H2 in the second gas.

[0036] In this embodiment, the gas analysis unit can employ a combined detection scheme, including an infrared analyzer and a thermal conductivity gas analyzer. The infrared analyzer utilizes the absorption characteristics of different gases to infrared spectra to determine the real-time concentrations of CO, CO2, O2, and CH4 in the second coal gas. The thermal conductivity gas analyzer analyzes the concentration of H2 in the second coal gas based on the differences in the thermal conductivity of different gases. The combined use of these two analyzers enables rapid and continuous output of multi-component gas concentration data, meeting the need for real-time monitoring of coal gas composition during the material level reduction process. Simultaneously, the infrared analyzer offers high accuracy in detecting O2, while the thermal conductivity analyzer provides sensitive response to H2; their combination accurately detects the risk of H2 and O2 exceeding limits, providing a reliable basis for safety control.

[0037] In some embodiments, the gas treatment unit includes an exhaust pipe and an ignition device. The exhaust pipe is connected to the gas analysis unit and the ignition device, respectively. The ignition device is used to perform combustion treatment on the gas discharged from the gas analysis unit through the exhaust pipe.

[0038] In this embodiment, the ignition device can be any one of an electric heating wire igniter, a spark plug igniter, a high-voltage arc igniter, or a continuous lamp ignition device. Combined with... Figure 1 and Figure 2 It is known that the ignition device can be installed at the furnace top maintenance platform. The height difference between the furnace top maintenance platform and the manhole maintenance platform is between 10 and 15 meters. When the ignition device ignites the second gas discharged from the gas analysis unit, the flame can be kept away from the manhole platform and the operators to ensure that the combustion process is safe and controllable. At the same time, the high-level emission reduces the baking impact on the furnace top equipment.

[0039] A second aspect of this application provides a blast furnace gas composition measurement system. The measurement system includes a measurement device according to the first aspect of this application, and a data processing platform communicatively connected to the measurement device. The data processing platform is used to receive the concentration value of the target gas output by the measurement device and compare the concentration value of the target gas with a preset concentration threshold of the target gas. If the concentration value of the target gas exceeds the preset concentration threshold, the concentration value of the target gas is reduced by a control strategy. The control strategy executes at least one of the following strategies: reducing or stopping water injection in the blast furnace, reducing the blast furnace blast volume, and increasing the nitrogen injection volume in the blast furnace.

[0040] In this embodiment, the measurement system is composed of the aforementioned measuring device and data processing platform. The measuring device is installed on the blast furnace top manhole maintenance platform and is responsible for periodically collecting, preprocessing, analyzing the gas, and transmitting the concentration data of various gases in the second gas. The data processing platform (e.g., a multi-client data receiving platform) is located at a remote location (e.g., the foreman's operating room) and can communicate with the measuring device via a wireless network (e.g., a mobile network).

[0041] During operation, the data processing platform receives real-time concentration values ​​of target gases (at least H2 and O2) from the measuring device and compares these values ​​with preset concentration thresholds (e.g., H2 ≥ 8%, O2 ≥ 0.8%). When the concentration of any target gas exceeds the corresponding preset concentration threshold, the data processing platform triggers a control strategy, automatically or prompting the operator to perform at least one of the following operations: reduce or stop water injection into the blast furnace, reduce the blast furnace blast rate, or increase the nitrogen injection rate into the blast furnace. These operations can suppress the generation of H2 and O2 at the source (reducing water injection reduces water decomposition reaction, reducing blast rate reduces oxygen entry and lowers furnace temperature, and increasing nitrogen injection rate dilutes combustible gas concentration), thereby rapidly reducing the H2 and O2 concentrations in the gas to within safe limits.

[0042] Through the collaborative work of the measuring device and the data processing platform, real-time monitoring, alarm for exceeding the standard, and closed-loop safety control of the gas composition during the blast furnace charge reduction period were achieved, effectively avoiding detonation accidents, ensuring the safety of personnel and equipment, and improving the gas recovery efficiency.

[0043] In some embodiments, if the concentration of the target gas exceeds a preset concentration threshold, the concentration of the target gas is reduced by a control strategy, including: reducing or stopping the water injection in the blast furnace, and re-measuring the concentration of the target gas after a first preset time; if the concentration of the target gas still exceeds the preset concentration threshold, reducing the blast furnace blast rate, and re-measuring the concentration of the target gas after a second preset time; if the concentration of the target gas still exceeds the preset concentration threshold, increasing the nitrogen injection rate into the blast furnace.

[0044] In this embodiment, when the data processing platform detects that the concentration of the target gas exceeds a preset concentration threshold, since water decomposition at high temperatures is the main source of H2 production, measures such as reducing or completely stopping water injection at the furnace top can be prioritized. After this operation, the system waits for a first preset time (e.g., 1-2 minutes, which can be set according to the furnace top temperature change and gas response time), and then the measuring device remeasures the concentration of the target gas and reports it to the data processing platform. If the concentration still exceeds the standard, the blast volume is reduced. If the H2 or O2 concentration still does not drop to a safe range after reducing or stopping water, it indicates that the combustion intensity and oxygen supply in the furnace need to be further reduced. At this time, the blast volume is reduced (e.g., reduced by 10% from the current volume). After this, the system waits for a second preset time and remeasures the concentration of the target gas. If the concentration still exceeds the standard, the nitrogen injection rate is increased. If the target gas concentration still exceeds the preset concentration threshold after the first two steps, it indicates that the material level may have dropped to the furnace belly area, and the water decomposition reaction is intense and difficult to suppress. At this point, the nitrogen injection rate through the static pressure orifice in the furnace body is increased, specifically through... Figure 1 Nitrogen gas is introduced into the static pressure orifice to reduce the relative concentrations of H2 and O2 through the inert dilution effect of nitrogen. This control strategy prioritizes measures with minimal impact on production (water reduction / shutdown), gradually escalating to reducing air volume and increasing nitrogen. This avoids excessive operation that could interfere with the material level reduction process while effectively controlling the H2 and O2 concentrations below the safe threshold. If the concentrations continue to exceed the standard after implementing the above control strategy, it indicates that gas recovery is no longer safe. In this case, the gas supply should be cut off and the furnace top vent valve should be opened, transitioning to the atmospheric pressure material level reduction stage. The first and second preset durations in this embodiment can be set according to actual needs and are not limited in this embodiment.

[0045] In some embodiments, the preset concentration threshold for H2 is 8%, and the preset concentration threshold for O2 is 0.8%.

[0046] In this embodiment, when the H2 concentration in the gas exceeds 8% or the O2 concentration exceeds 0.8%, the mixed gas is in a high explosion risk range, requiring an alarm to be triggered and corresponding control strategies to be implemented. This avoids delayed warnings due to excessively high thresholds or frequent false alarms due to excessively low thresholds, thus ensuring both safety and the continuity of the material level reduction operation.

[0047] In some embodiments, the measurement system further includes: a display interface and an alarm unit, the display interface and the alarm unit being connected to the data processing unit respectively; wherein, the display interface is used to display the concentration value curve of each gas component in the gas analysis unit changing over time; the alarm unit is used to issue an alarm signal when the concentration value of the target gas exceeds a preset concentration threshold.

[0048] In this embodiment, the measurement system also includes a display interface and an alarm unit, which are connected to the data processing unit. The display interface is used to display the real-time curves of the concentration values ​​of various gas components (such as CO, CO2, H2, O2, CH4) output by the gas analysis unit over time, enabling operators to intuitively monitor the dynamic changes in gas composition during the lowering process and quickly identify abnormal fluctuations. The alarm unit is used to automatically issue audible and visual alarm signals when the concentration value of the target gas (H2 or O2) exceeds a preset concentration threshold (H2≥8%, O2≥0.8%), reminding operators to take appropriate control strategies (such as reducing water, reducing airflow, increasing nitrogen, etc.). Through the coordinated operation of the display interface and the alarm unit, the system achieves real-time visual monitoring and immediate early warning of exceeding the standard for gas composition, significantly improving the safety and response efficiency of the lowering operation.

[0049] For example, the measurement system provided in this embodiment will be described in detail below through a specific example: Step 1: Before lowering the blast furnace charge, transport the measuring equipment to the top of the furnace, connect the power supply to each piece of equipment, connect the gas sampling point, and complete the connection of the remaining pipeline sections. Test the solenoid valve switch and gas analyzer to ensure they are functioning correctly. In the foreman's control room, open the data processing platform and test the data sending and receiving functions to ensure they are working properly. After completing all testing, close the solenoid valve switch and wait for the blast furnace charge lowering operation. Figure 1 As shown; Step 2: Set the preset concentration thresholds for H2 and O2 respectively. The preset concentration threshold for H2 is 8%, and the preset concentration threshold for O2 is 0.8%.

[0050] Step 3: After the blast furnace feed level reduction operation begins, the gas detection system is remotely activated through the data processing platform. The measuring device starts sending data, the data processing platform starts receiving data, and displays the content curves of gases such as CO, CO2, H2, O2, and CH4 over time on the client's display interface.

[0051] Step 4: During the reduction of the charge level, if the H2 content exceeds 8%, an alarm will be triggered by the receiving platform. The blast furnace operator will then reduce or stop water injection, and simultaneously reduce the blast volume by 10%. Once the H2 content has decreased to a safe level below 8%, the blast volume will be gradually increased, and the water injection rate will be gradually restored.

[0052] Step 5: After the material level drops to the furnace belly area, the H2 content frequently exceeds 8% and cannot be reduced to below 8% by reducing the air volume. Cut off the gas supply to the gas pipeline network and open the furnace top vent to enter the atmospheric pressure material level reduction stage. At this time, the gas detection work is completed. Close the solenoid valve, gas analyzer and other devices, save the data and complete the online gas detection work.

[0053] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0054] Embodiments of the present invention are described with reference to flowchart illustrations and / or block diagrams of methods and apparatus according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing terminal device to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing terminal device, generate instructions for implementing the flowchart illustrations. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0055] Although preferred embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the embodiments of the present invention.

[0056] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or terminal device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or terminal device. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or terminal device that includes said element.

[0057] The foregoing has provided a detailed description of the blast furnace gas composition measuring device and system provided by the present invention. Specific examples have been used to illustrate the principle and implementation of the present invention. The description of the above embodiments is only for the purpose of helping to understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the idea of ​​the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A device for measuring the composition of blast furnace gas, characterized in that, The measuring device is installed at the manhole maintenance platform on the top of the blast furnace. The measuring device includes a gas analysis unit, and a gas sampling unit and a gas processing unit respectively connected to the gas analysis unit. The gas sampling unit is used to periodically collect the first gas discharged from the top exhaust pipe of the blast furnace, pre-treat the first gas to obtain the second gas, and output the second gas to the gas analysis unit; wherein, the pre-treatment includes at least removing moisture and dust from the first gas; The gas analysis unit is used to analyze and obtain the concentration value of the target gas in the second coal gas, output the concentration value of the target gas to the data processing platform for processing, and discharge the analyzed second coal gas to the coal gas processing unit; wherein, the target gas includes at least H2 and O2; The gas processing unit is used to combust the second gas discharged from the gas analysis unit.

2. The measuring device according to claim 1, characterized in that, The gas sampling unit includes: a refrigerated dryer, a first electric ball valve, a first sampling tube, and a second sampling tube. The first end of the first sampling tube is connected to the refrigerated dryer, the second end of the first sampling tube is connected to the furnace top exhaust pipe, the first end of the second sampling tube is connected to the refrigerated dryer, and the second end of the second sampling tube is connected to the gas analysis unit. The first electric ball valve is installed on the first sampling pipe and is used to control the opening and closing of the first sampling pipe and the flow rate of the first gas entering the refrigerated dryer.

3. The measuring device according to claim 2, wherein the gas sampling unit further comprises a second electric ball valve and a silica gel moisture absorbent disposed on the second sampling tube, the silica gel moisture absorbent being disposed between the second electric ball valve and the gas analysis unit; wherein, The second electric ball valve is used to control the flow rate of the second gas entering the gas analysis unit; The silica gel moisture absorbent is used to absorb moisture and dust in the second gas.

4. The measuring device according to claim 2, characterized in that, The gas sampling unit further includes an automatic drain valve connected to the condensate outlet of the refrigerated dryer, the automatic drain valve being used to discharge the mixture of moisture and dust condensed in the first gas.

5. The measuring device according to claim 1, characterized in that, The gas analysis unit includes an infrared analyzer and a thermal conductivity gas analyzer. The infrared analyzer is used to determine the concentration values ​​of CO, CO2, O2 and CH4 in the second coal gas. The thermal conductivity gas analysis unit is used to analyze the concentration value of H2 in the second coal gas.

6. The measuring device according to claim 1, characterized in that, The gas treatment unit includes an exhaust pipe and an ignition device. The exhaust pipe is connected to the gas analysis unit and the ignition device, respectively. The ignition device is used to combust the gas discharged from the gas analysis unit through the exhaust pipe.

7. A system for measuring the composition of blast furnace gas, characterized in that, The measurement system includes the measuring device according to any one of claims 1-6, and a data processing platform communicatively connected to the measuring device; The data processing platform is used to receive the concentration value of the target gas output by the measuring device and compare the concentration value of the target gas with a preset concentration threshold of the target gas; wherein the target gas includes at least H2 and O2; If the concentration of the target gas exceeds the preset concentration threshold, the concentration of the target gas is reduced by a control strategy. The control strategy executes at least one of the following strategies: reducing or stopping the water injection of the blast furnace, reducing the blast furnace blast volume, or increasing the nitrogen injection of the blast furnace.

8. The measurement system according to claim 7, characterized in that, If the concentration of the target gas exceeds the preset concentration threshold, a control strategy is employed to reduce the concentration of the target gas, including: Reduce or stop water supply to the blast furnace, and after a first preset time, remeasure the concentration of the target gas. If the concentration of the target gas still exceeds the preset concentration threshold, the blast furnace air volume is reduced, and the concentration of the target gas is remeasured after a second preset time. If the concentration of the target gas still exceeds the preset concentration threshold, the nitrogen injection rate into the blast furnace is increased.

9. The measurement system according to claim 7, characterized in that, The concentration threshold for H2 is 8%, and the concentration threshold for O2 is 0.8%.

10. The measurement system according to claim 7, characterized in that, The measurement system further includes: a display interface and an alarm unit, wherein the display interface and the alarm unit are respectively connected to the data processing unit; wherein... The display interface is used to display the concentration curves of each gas component in the gas analysis unit over time. The alarm unit is used to issue an alarm signal when the concentration of the target gas exceeds the preset concentration threshold.

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