A pipe safe delivery method for a gas blending concentration measurement system

Abstract

The application discloses a pipeline safe conveying method for a gas mixing concentration measuring system, the gas mixing concentration measuring system comprising a mixing device, a heat accumulation oxidation device and a remote control platform, the mixing device being connected with a low-concentration gas conveying pipe, an air conveying pipe and a low-temperature flue gas recovery conveying pipe, the mixing device being connected with the heat accumulation oxidation device through a gas mixture conveying pipe, and a flow measuring instrument and a gas concentration monitoring device being arranged at the gas inlet end and the gas outlet end of the gas mixture conveying pipe respectively, and an induced draft fan and a quick shut-off valve being arranged at the gas inlet end and the gas outlet end of the gas mixture conveying pipe respectively; the pipeline safe conveying method comprises a pipeline economic length determination method and a safe operation control method, through reasonable selection of pipeline parameters of the gas mixture conveying pipe, the system safety design requirement can be met, and the pipeline investment cost can be reduced, through reasonable control of parameters of the gas mixture, the safe operation of the system is ensured, the low-temperature flue gas waste heat is fully recovered, energy resources are greatly saved, and the comprehensive benefits are remarkable.

Description

Technical Field

[0001] This invention belongs to the field of coal mine gas mixture concentration measurement technology, specifically relating to a pipeline safe transportation method for a gas mixture concentration measurement system. Background Technology

[0002] Coal mines in my country typically generate methane gas of varying concentrations during production. High-concentration methane gas can be used directly, while low-concentration methane gas cannot be directly utilized and is usually released directly into the atmosphere. For example, methane gas extraction mainly involves low-concentration methane gas with a concentration below 8%. Collecting and utilizing this low-concentration methane gas, which cannot be directly used during coal mine production, could effectively solve coal mine methane accidents, improve production and living conditions in mining areas, increase the supply of clean energy, and reduce greenhouse gas emissions (the greenhouse effect of methane gas is 21 times that of the same mass of carbon dioxide), achieving multiple goals of protecting life, conserving resources, and protecting the environment.

[0003] Currently, coal mines generally employ regenerative thermal oxidation (RTO) technology to recover and utilize low-concentration methane gas generated during coal mine production. This not only solves the greenhouse effect problem caused by the direct emission of low-concentration methane gas, but also outputs heat energy to meet various energy needs of the coal mine, thus saving energy consumption. However, the key equipment in this technology is the RTO unit, which has strict requirements on methane concentration. The methane gas extracted from the coal mine first enters a mixing device to mix with air, low-temperature flue gas, and other gases to form a methane mixture with the required concentration for the RTO unit. This mixture then enters the RTO unit for oxidation and heat generation to meet the energy needs of coal mine production and daily life. At this point, to ensure the safe operation of the RTO unit, it is necessary to quickly and accurately measure and monitor the methane concentration of the methane mixture output from the mixing device. This prevents the methane concentration of the methane mixture from exceeding the specified methane concentration limit of the RTO unit, which would affect its safe operation.

[0004] Currently, the main methods for measuring methane concentration in coal mine gas blending include laser-based and infrared-based methods. Both methods involve a response time, and the control system experiences a delay between acquiring an excessive methane concentration from the gas concentration monitoring device and issuing a feedback signal to close the inlet valve of the regenerative thermal oxidizer. Therefore, the selection of parameters for the pipeline between the blending device and the regenerative thermal oxidizer directly affects the safe operation of the entire system. For example, if the diameter and length of the pipeline are too small, the time the gas mixture output from the blending device spends in the pipeline will be less than the delay time of the control system. This results in the gas mixture exceeding the safety limit of the regenerative thermal oxidizer entering the device before the inlet valve is closed, severely impacting the safe operation of the entire system. Summary of the Invention

[0005] The purpose of this invention is to overcome the above-mentioned shortcomings in the prior art and to provide a pipeline safe transportation method that is reasonably designed, reliable in performance, and used in a gas mixing concentration measurement system.

[0006] The technical solution adopted by this invention to solve the above problems is: a pipeline safety transportation method for a gas mixing concentration measurement system, characterized in that the gas mixing concentration measurement system includes: a mixing device, a regenerative oxidation device, and a remote control information platform. The mixing device is provided with a low-concentration gas inlet, an air inlet, a low-temperature flue gas inlet, and a gas-mixed gas outlet. The low-concentration gas inlet, air inlet, and low-temperature flue gas inlet of the mixing device are respectively connected to a low-concentration gas delivery pipe, an air delivery pipe, and a low-temperature flue gas recovery delivery pipe. A first regulating valve, a first quick-shut-off valve, and a first gas flow meter are installed on the low-concentration gas delivery pipe; a second regulating valve and a second gas flow meter are installed on the air delivery pipe; and a third regulating valve and a third gas flow meter are installed on the low-temperature flue gas recovery delivery pipe. The outlet of the gas mixture is connected to the inlet port of the gas mixture conveying pipe, and a fourth gas flow meter and a gas mixture concentration monitoring device are installed at the inlet port of the gas mixture conveying pipe. The gas mixture inlet of the regenerative oxidation device is connected to the outlet port of the gas mixture conveying pipe, and a water seal venting device, an induced draft fan, and a second quick shut-off valve are installed at the outlet port of the gas mixture conveying pipe. The remote control information platform is wirelessly connected to the first regulating valve, the first quick shut-off valve, the first gas flow meter, the second regulating valve, the second gas flow meter, the third regulating valve, the third gas flow meter, the fourth gas flow meter, the gas mixture concentration monitoring device, the induced draft fan, and the second quick shut-off valve via the Internet. The remote control information platform can remotely obtain data transmitted by the connected devices and remotely issue operation commands to the connected devices through the network.

[0007] The pipeline safe transportation method includes a pipeline length selection method and a safety control method;

[0008] The method for selecting the pipeline length refers to the following steps: First, based on the range of economic specific friction of the mixed gas delivery pipe and the maximum inlet flow rate under rated operating conditions of the regenerative thermal oxidation unit, the range of pipe diameter values ​​for the mixed gas delivery pipe is calculated. Second, based on the response time of the fourth gas flow meter, the response time of the mixed gas concentration monitoring device, the delay time of network data transmission, the response time of the remote control information platform, and the response time of the No. 2 quick shut-off valve adjustment, the total system delay time from measuring the flow rate and gas concentration of the gas mixture to closing the No. 2 quick shut-off valve is calculated. Then, based on the maximum inlet flow rate under rated operating conditions of the regenerative thermal oxidation unit, the range of pipe diameter values ​​for the mixed gas delivery pipe, and the total system delay time, the range of pipe length values ​​for the mixed gas delivery pipe is determined. Finally, based on the pipe material price and the range of pipe length values ​​for the mixed gas delivery pipe, the economic length value and its corresponding pipe diameter value for the mixed gas delivery pipe are calculated.

[0009] The safety control method refers to the following steps: First, based on the economical pipe length value and corresponding pipe diameter value obtained from the pipe length selection method, the pipe length and pipe diameter of the mixed gas delivery pipe of the gas mixing concentration measurement system are selected. Then, when the gas mixing concentration measurement system is first started, the No. 1 and No. 2 quick-shut-off valves are opened, and the openings of the No. 1, No. 2, and No. 3 regulating valves are opened and adjusted. This adjusts the flow rate and gas concentration parameters of the gas mixture output by the mixing device, ensuring that the flow rate monitored and measured by the fourth gas flow meter does not exceed the maximum inlet flow of the regenerative oxidation device. The gas concentration monitored and measured by the gas mixing gas concentration monitoring device is kept within the allowable gas concentration range of the regenerative thermal oxidation device. When the gas mixing concentration measurement system is running stably, the opening of regulating valves No. 1, No. 2 and No. 3 is adjusted synchronously according to the gas mixing gas flow rate and gas concentration value required by the operating conditions of the regenerative thermal oxidation device, so that the flow rate parameters and gas concentration parameters of the gas mixing gas output by the mixing device meet the requirements of the operating conditions of the regenerative thermal oxidation device, and it must be ensured that the gas mixing gas output by the mixing device is transported in the gas mixing gas delivery pipe for a time not less than the total system delay time.

[0010] Furthermore, the method for selecting the pipe length includes the following steps:

[0011] S1: The economical range of the specific friction resistance of the mixed gas delivery pipe is selected as [κ]. min , κ max The maximum inlet air flow rate of the regenerative thermal oxidation unit under rated operating conditions is G. max The diameter of the gas mixture delivery pipe is calculated according to formula (1):

[0012]

[0013] In the formula: κ is the specific frictional resistance of the gas mixture delivery pipe; ρ is the density of the gas mixture; G is the flow rate of the gas mixture; D is the diameter of the gas mixture delivery pipe; λ is a coefficient;

[0014] Therefore, by utilizing the range of economic specific friction of the gas-mixed transport pipe, the range of pipe diameter values ​​can be obtained [D]. min D max ]for

[0015] S2: Let a be the response time required for the fourth gas flow meter to measure flow data, b be the response time required for the mixed gas gas concentration monitoring device to measure gas concentration data, c be the response time required for the remote control information platform software program to process data signals and generate operation command signals, d be the total network transmission delay required for the fourth gas flow meter and the mixed gas gas concentration monitoring device to wirelessly transmit data signals to the remote control information platform and for the remote control information platform to wirelessly transmit operation command signals to the No. 2 quick shut-off valve, and e be the response time required for the No. 2 quick shut-off valve to execute the operation command signal. Then, the calculation method for the total system delay time τ from measuring the flow rate and gas concentration of the gas mixture to closing the No. 2 quick shut-off valve is as follows:

[0016] f = a + b + c + d + e (2)

[0017] S3: Based on the maximum inlet air flow rate G under rated operating conditions of the regenerative oxidation device max The range of values ​​for the diameter of the mixed gas delivery pipe [D] min D max ] and the total system delay time f, determine the range of values ​​for the length of the gas mixture delivery pipe [L] min L ma ] x for Where γ is a coefficient;

[0018] S4: Calculate the total cost of the pipe material for the mixed gas delivery pipe using formula (2):

[0019] A = ζ × ((D + 2α) 2 -D 2 )×L×σ×ψ(3)

[0020] In the formula: ζ is a coefficient, ψ is the unit weight price of the pipe material corresponding to the mixed gas transmission pipe, σ is the density of the pipe material corresponding to the mixed gas transmission pipe, and α is the wall thickness of the mixed gas transmission pipe, which is obtained by searching publicly available pipeline production standard data using the actual pipe diameter value D.

[0021] Based on multiple searches of publicly available pipeline production standards, the pipe inner diameter and wall thickness values ​​corresponding to different nominal pipe diameters were obtained, ensuring that the pipe inner diameter value falls within the range of values ​​for the mixed gas delivery pipe diameter [D].min D max Within ], then use the pipe inner diameter value to calculate the economic length value of the mixed gas conveying pipe, and finally use the pipe inner diameter value and economic length value to iterate multiple times through formula (3) to obtain the actual economically optimal total cost of pipe material. At this time, the iterative calculation stops, and the pipe inner diameter value and pipe length corresponding to the economically optimal total cost of pipe material are the final pipe diameter value D0 and the final economic length value L0 of the mixed gas conveying pipe.

[0022] Furthermore, the security control method includes:

[0023] Based on the economical pipe length value and its corresponding pipe diameter value obtained from the pipe length selection method, the pipe length and pipe diameter of the mixed gas delivery pipe of the gas mixing concentration measurement system are selected.

[0024] When the gas mixing concentration measurement system is first started, open the No. 1 and No. 2 quick shut-off valves, and open and adjust the openings of the No. 1, No. 2 and No. 3 regulating valves to ensure that the flow parameters of the gas mixture output by the mixing device meet the lower limit of the flow rate required for stable operation of the regenerative thermal oxidation device, and that the gas concentration parameters of the gas mixture meet the lower limit of the gas concentration required for stable operation of the regenerative thermal oxidation device. After the regenerative thermal oxidation device enters a stable operating state, adjust the openings of the No. 1, No. 2 and No. 3 regulating valves to increase the flow rate and gas concentration of the gas mixture output by the mixing device. At the same time, monitor that the actual flow rate measured by the fourth gas flow meter does not exceed the maximum inlet flow rate of the regenerative thermal oxidation device and that the actual gas concentration measured by the gas mixture concentration monitoring device remains within the allowable gas concentration range of the regenerative thermal oxidation device.

[0025] When the gas mixing concentration measurement system is running stably, the opening of regulating valves No. 1, No. 2 and No. 3 is adjusted synchronously according to the flow rate and gas concentration value of the gas mixture required by the actual operating conditions of the regenerative oxidation device. This ensures that the flow rate and gas concentration parameters of the gas mixture output by the mixing device meet the requirements of the actual operating conditions of the regenerative oxidation device. It is also necessary to ensure that the gas mixture output by the mixing device is transported in the gas mixture delivery pipe for a time not less than the total system delay time.

[0026] At this time, when it is necessary to keep the flow rate of the gas mixture output by the mixing device constant but the gas concentration of the gas mixture needs to be changed, the opening of the No. 1 regulating valve is increased (or decreased) and the opening of the No. 2 and No. 3 regulating valves is decreased (or increased) simultaneously, so that the flow change value measured by the first gas flow meter is equal to the sum of the flow change values ​​measured by the second and third gas flow meters.

[0027] At this time, when it is necessary to change the flow rate of the gas mixture to keep the gas concentration of the gas mixture output by the mixing device constant, the opening of regulating valve No. 1, regulating valve No. 2 and regulating valve No. 3 are increased (or decreased) simultaneously, so that the flow rate change value measured by the first gas flow meter is increased (or decreased) proportionally to the sum of the flow rate change values ​​measured by the second gas flow meter and the third gas flow meter.

[0028] Furthermore, when the gas concentration measured by the gas concentration monitoring device exceeds the upper limit of the gas concentration specified by the regenerative oxidation device, the No. 2 quick shut-off valve is quickly shut off and the induced draft fan is stopped. At this time, the water seal venting device is used to purge the mixing device and the gas mixture delivery pipe to remove the gas mixture exceeding the upper limit of the gas concentration.

[0029] Furthermore, in accordance with the requirement that the oxygen concentration of the gas mixture output by the mixing device meets the lower limit of the oxygen concentration specified by the regenerative oxidation device, the opening of the No. 3 regulating valve is increased and the opening of the No. 2 regulating valve is decreased simultaneously, so that the increase in the low-temperature flue gas flow rate output by the low-temperature flue gas recovery and conveying pipe is equal to the decrease in the air flow rate output by the air conveying pipe, thereby maximizing the recovery and utilization of the waste heat of the low-temperature flue gas.

[0030] Furthermore, the remote control information platform is wired to the No. 1 regulating valve, the No. 1 quick shut-off valve, the first gas flow meter, the No. 2 regulating valve, the second gas flow meter, the No. 3 regulating valve, the third gas flow meter, the fourth gas flow meter, the mixed gas concentration monitoring device, the induced draft fan, and the No. 2 quick shut-off valve via a signal transmission line. The remote control information platform can remotely acquire data transmitted by the connected devices and remotely issue operation commands to the connected devices through the signal transmission line.

[0031] At this point, d in step S2 of the pipeline length selection method is the total wired transmission delay required for the fourth gas flow meter and the mixed gas concentration monitoring device to transmit data signals to the remote control information platform and for the remote control information platform to transmit operation command signals to the second fast shut-off valve.

[0032] Compared with the prior art, the present invention has the following advantages and effects: (1) By rationally selecting the pipeline parameters of the mixed gas conveying pipe and controlling the output parameters of the gas mixed gas from the mixing device, the present invention effectively avoids the phenomenon of gas mixed gas exceeding the safety limit value of gas concentration entering the regenerative oxidation device due to the operation delay time of the control system, thereby improving the safety and reliability of the gas mixing concentration measurement system; (2) When selecting the pipeline parameters of the mixed gas conveying pipe, the present invention also considers the price of pipe materials, so that the determined pipe diameter and length meet the safety design requirements while the facility investment cost of the entire mixed gas conveying pipe is the lowest, greatly improving the overall economic efficiency of the project construction; (3) When controlling the output parameters of the gas mixed gas from the mixing device, the present invention also considers the full utilization of the waste heat of low-temperature flue gas, so that the flow parameters and gas concentration parameters of the gas mixed gas meet the safety operation requirements of the regenerative oxidation device, while maximizing the recovery and utilization of the waste heat of low-temperature flue gas, saving energy resources, and generating significant economic and social benefits.

[0033] This invention creates a pipeline safety transportation method for a gas mixing concentration measurement system. Firstly, by utilizing a pipeline length selection method, the pipeline parameters of the mixed gas transportation pipe are rationally chosen, ensuring that the pipe diameter and length meet the system's safety design requirements while reducing pipeline investment costs and improving overall economic efficiency. Secondly, by utilizing a safety control method, the flow rate and gas concentration parameters of the gas mixture output by the mixing device are rationally controlled, ensuring that both parameters meet the operating requirements of the regenerative thermal oxidation device, and guaranteeing that the transportation time of the gas mixture output by the mixing device within the transportation pipe is not less than the total system delay time. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of a pipeline safe transport method for a gas mixing concentration measurement system according to an embodiment of the present invention.

[0035] In the diagram: 01-Blending device, 02-Regenerative oxidation device, 03-Remote control information platform, 11-Regulating valve No. 1, 12-Quick shut-off valve No. 1, 13-First gas flow meter, 14-Low concentration gas delivery pipe, 21-Regulating valve No. 2, 22-Second gas flow meter, 24-Air delivery pipe, 31-Regulating valve No. 3, 32-Third gas flow meter, 33-Low temperature flue gas recovery delivery pipe, 41-Fourth gas flow meter, 42-Mixed gas gas concentration monitoring device, 43-Water seal venting device, 44-Induced draft fan, 45-Quick shut-off valve No. 2, 46-Mixed gas delivery pipe. Detailed Implementation

[0036] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. The following embodiments are explanations of the present invention, but the present invention is not limited to the following embodiments.

[0037] See Figure 1 This embodiment relates to a pipeline safety transportation method for a gas mixing concentration measurement system. The gas mixing concentration measurement system includes: a mixing device 01, a regenerative oxidation device 02, and a remote control information platform 03. The mixing device 01 is equipped with a low-concentration gas inlet, an air inlet, a low-temperature flue gas inlet, and a gas-mixed gas outlet. The low-concentration gas inlet, air inlet, and low-temperature flue gas inlet of the mixing device 01 are respectively connected to a low-concentration gas delivery pipe 14, an air delivery pipe 23, and a low-temperature flue gas recovery delivery pipe 33. A first regulating valve 11, a first quick-shut-off valve 12, and a first gas flow meter 13 are installed on the low-concentration gas delivery pipe 14. A second regulating valve 21 and a second gas flow meter 22 are installed on the air delivery pipe 23. A third regulating valve 31 and a third gas flow meter 32 are installed on the low-temperature flue gas recovery delivery pipe 33. The gas-mixed gas outlet of the mixing device 01 is connected to the gas-mixed gas delivery pipe. The gas inlet of the gas delivery pipe 46 is connected to the gas outlet of the gas delivery pipe 46. A fourth gas flow meter 41 and a gas concentration monitoring device 42 are installed at the gas inlet of the gas delivery pipe 46. The gas mixture inlet of the regenerative oxidation device 02 is connected to the gas outlet of the gas delivery pipe 46. A water seal venting device 43, an induced draft fan 44 and a second quick shut-off valve 45 are installed at the gas outlet of the gas delivery pipe 46. The remote control information platform 03 is wirelessly connected to the first regulating valve 11, the first quick shut-off valve 12, the first gas flow meter 13, the second regulating valve 21, the second gas flow meter 22, the third regulating valve 31, the third gas flow meter 32, the fourth gas flow meter 41, the gas concentration monitoring device 42, the induced draft fan 44 and the second quick shut-off valve 45 via the Internet. The remote control information platform 03 can remotely obtain the data transmitted by the connected devices and remotely issue operation commands to the connected devices through the network.

[0038] The pipeline safety transportation method includes a pipeline length selection method and a safety control method. Specifically, the pipeline length selection method involves: first, calculating and determining the range of pipe diameter values ​​for the mixed gas delivery pipe 46 based on the economic specific friction range and the maximum inlet flow rate under rated operating conditions of the regenerative oxidation device 02; second, calculating the total system delay time from measuring the flow rate and gas concentration of the gas mixture to closing the second quick-shutdown valve 45 based on the response time of the fourth gas flow meter 41, the response time of the mixed gas gas concentration monitoring device 42, the network transmission data delay time, the response time of the remote control information platform 03, and the adjustment response time of the second quick-shutdown valve 45; then, determining the range of pipe length values ​​for the mixed gas delivery pipe 46 based on the maximum inlet flow rate under rated operating conditions of the regenerative oxidation device 02, the range of pipe diameter values ​​for the mixed gas delivery pipe 46, and the total system delay time; and finally, calculating and determining the economic length value and corresponding pipe diameter value of the mixed gas delivery pipe 46 based on the pipe material price and the length range. The safety control method refers to the following steps: First, based on the economical pipe length value and corresponding pipe diameter value obtained from the pipe length selection method, the pipe length and pipe diameter of the mixed gas delivery pipe 46 of the gas mixing concentration measurement system are selected. Then, when the gas mixing concentration measurement system is first started, the No. 1 quick shut-off valve 12 and the No. 2 quick shut-off valve 45 are opened, and the openings of the No. 1 regulating valve 11, the No. 2 regulating valve 21, and the No. 3 regulating valve 31 are opened and adjusted. This adjusts the flow rate parameters and gas concentration parameters of the gas mixture output by the mixing device 01, ensuring that the flow rate monitored and measured by the fourth gas flow meter 41 does not exceed the maximum inlet flow rate of the regenerative oxidation device 02. The gas concentration monitored by the gas concentration monitoring device 42 is kept within the allowable gas concentration range of the regenerative oxidation device 02. When the gas mixing concentration measurement system is running stably, the opening of regulating valve 11, regulating valve 21 and regulating valve 31 are adjusted synchronously according to the gas mixing gas flow rate and gas concentration value required for the operation of the regenerative oxidation device 02. This ensures that the gas mixing gas output by the mixing device 01 meets the requirements of the operation of the regenerative oxidation device 02, and the gas mixing gas output by the mixing device 01 must be transported in the gas mixing gas delivery pipe 46 for a time not less than the total system delay time.

[0039] In this embodiment, the pipe length selection method further includes the following steps:

[0040] S1: The economical specific friction range for the mixed gas delivery pipe 46 is selected as [κ]. min κ max The maximum inlet air flow rate of the regenerative thermal oxidation device 02 under rated operating conditions is G. max The diameter of the gas-mixing pipe 46 is calculated according to formula (1):

[0041]

[0042] In the formula: κ is the specific frictional resistance of the gas-mixing pipe 46; ρ is the gas-mixing density; G is the gas-mixing flow rate; D is the pipe diameter of the gas-mixing pipe 46; λ is a coefficient;

[0043] Therefore, by utilizing the range of economic specific friction resistance of the gas-mixing pipe 46, the range of pipe diameter values ​​for the gas-mixing pipe 46 can be obtained [D]. min D max ]for

[0044] S2: Let a be the response time required for the fourth gas flow meter 41 to measure flow data, b be the response time required for the mixed gas gas concentration monitoring device 42 to measure gas concentration data, c be the response time required for the remote control information platform 03 software program to process data signals and generate operation command signals, d be the total network transmission delay required for the fourth gas flow meter 41 and the mixed gas gas concentration monitoring device 42 to wirelessly transmit data signals to the remote control information platform 03 and for the remote control information platform 03 to wirelessly transmit operation command signals to the second quick shut-off valve 45, and e be the response time required for the second quick shut-off valve 45 to execute the operation command signal. Then, the calculation method for the total system delay time τ from measuring the flow rate and gas concentration of the gas mixture to closing the second quick shut-off valve 45 is as follows:

[0045] f = a + b + c + d + e (2)

[0046] S3: Based on the maximum inlet air flow rate G of the regenerative oxidation device under rated operating conditions 02 max The range of values ​​for the diameter of the 46mm diameter pipe for the mixed gas delivery pipe [D] min D max ] and the total system delay time f, determine the range of values ​​for the length of the gas-mixed delivery pipe 46 [L] min L max ]for Where γ is a coefficient;

[0047] S4: Calculate the total cost of the pipe material for the mixed gas delivery pipe 46 using formula (2):

[0048] A = ζ × ((D + 2α) 2 -D 2 )×L×σ×ψ (3)

[0049] In the formula: ζ is a coefficient, ψ is the unit weight price of the pipe material corresponding to the mixed gas conveying pipe 46, σ is the density of the pipe material corresponding to the mixed gas conveying pipe 46, and α is the wall thickness of the mixed gas conveying pipe 46, which is obtained by searching publicly available pipeline production standard data using the actual pipe diameter value D.

[0050] Based on multiple searches of publicly available pipeline production standards, the pipe inner diameter and wall thickness values ​​corresponding to different nominal pipe diameters were obtained, ensuring that the pipe inner diameter values ​​fall within the range of 46mm diameter for mixed gas delivery pipes [D]. min D max Within ], then the economic length value of the mixed gas conveying pipe 46 is calculated using the pipe inner diameter value. Finally, the pipe inner diameter value and the economic length value are used to iterate multiple times using formula (3) to obtain the actual economically optimal total cost of pipe material. At this time, the iterative calculation stops. The pipe inner diameter value and pipe length corresponding to the economically optimal total cost of pipe material are the final pipe diameter value D0 and the final economic length value L0 of the mixed gas conveying pipe 46.

[0051] In this embodiment, the security control method further includes:

[0052] Based on the economical pipe length value and its corresponding pipe diameter value obtained from the pipe length selection method, the pipe length and pipe diameter of the mixed gas delivery pipe 46 of the gas mixing concentration measurement system are selected.

[0053] When the gas mixing concentration measurement system is first started, open the No. 1 quick shut-off valve 12 and the No. 2 quick shut-off valve 45, and open and adjust the opening of the No. 1 regulating valve 11, the No. 2 regulating valve 21 and the No. 3 regulating valve 31 so that the flow parameters of the gas mixture output by the mixing device 01 meet the lower limit of the flow rate required for stable operation of the regenerative oxidizer 02, and the gas concentration parameters of the gas mixture meet the lower limit of the gas concentration required for stable operation of the regenerative oxidizer 02. After the regenerative oxidizer 02 enters a stable operating state, adjust the opening of the No. 1 regulating valve 11, the No. 2 regulating valve 21 and the No. 3 regulating valve 31 to increase the flow rate and gas concentration of the gas mixture output by the mixing device 01. At the same time, monitor that the actual flow rate measured by the fourth gas flow meter 41 does not exceed the maximum inlet flow rate of the regenerative oxidizer 02 and that the actual gas concentration measured by the gas mixture concentration monitoring device 42 remains within the allowable gas concentration range of the regenerative oxidizer 02.

[0054] When the gas mixing concentration measurement system is running stably, the opening of regulating valve 11, regulating valve 21 and regulating valve 31 are adjusted synchronously according to the flow rate and gas concentration value of the gas mixture required by the actual operating conditions of the regenerative oxidation device 02. This ensures that the flow rate and gas concentration parameters of the gas mixture output by the mixing device 01 meet the requirements of the actual operating conditions of the regenerative oxidation device 02. It is also necessary to ensure that the gas mixture output by the mixing device 01 is transported in the gas mixture delivery pipe 46 for a time not less than the total system delay time.

[0055] At this time, when it is necessary to keep the flow rate of the gas mixture output by the mixing device 01 constant but change the gas concentration of the gas mixture, the opening of the first regulating valve 11 is increased (or decreased) and the opening of the second regulating valve 21 and the third regulating valve 31 are decreased (or increased) simultaneously, so that the flow change value measured by the first gas flow meter 13 is equal to the sum of the flow change values ​​measured by the second gas flow meter 22 and the third gas flow meter 32.

[0056] At this time, when it is necessary to change the flow rate of the gas mixture to keep the gas concentration of the gas mixture output by the mixing device 01 constant, the opening of the first regulating valve 11, the second regulating valve 21 and the third regulating valve 31 are increased (or decreased) simultaneously, so that the flow rate change value measured by the first gas flow meter 13 increases (or decreases) proportionally to the sum of the flow rate change values ​​measured by the second gas flow meter 22 and the third gas flow meter 32.

[0057] In this embodiment, when the gas concentration measured by the gas concentration monitoring device 42 exceeds the upper limit of the gas concentration specified by the regenerative oxidation device 02, the second quick shut-off valve 45 is quickly shut off and the induced draft fan 44 is stopped. At this time, the water seal venting device 43 is used to purge the mixing device 01 and the gas mixture conveying pipe 46 to remove the gas mixture exceeding the upper limit of the gas concentration.

[0058] In this embodiment, in accordance with the requirement that the oxygen concentration of the gas mixture output by the mixing device 01 meets the lower limit of the oxygen concentration specified by the regenerative oxidation device 02, the opening of the third regulating valve 31 is increased and the opening of the second regulating valve 21 is decreased simultaneously, so that the increase in the low-temperature flue gas flow rate output by the low-temperature flue gas recovery and conveying pipe is equal to the decrease in the air flow rate output by the air conveying pipe 23, thereby maximizing the recovery and utilization of the waste heat of the low-temperature flue gas.

[0059] In this embodiment, the remote control information platform 03 can also be wired to the first regulating valve 11, the first quick shut-off valve 12, the first gas flow meter 13, the second regulating valve 21, the second gas flow meter 22, the third regulating valve 31, the third gas flow meter 32, the fourth gas flow meter 41, the mixed gas concentration monitoring device 42, the induced draft fan 44, and the second quick shut-off valve 45 via signal transmission lines. The remote control information platform 03 can also remotely acquire data transmitted by the connected devices and remotely issue operation commands to the connected devices via signal transmission lines.

[0060] At this time, d in step S2 of the pipeline length selection method is the total wired transmission delay time required for the fourth gas flow meter 41 and the mixed gas concentration monitoring device 42 to transmit data signals to the remote control information platform 03 and for the remote control information platform 03 to transmit operation command signals to the second fast shut-off valve 45.

[0061] Any content not described in detail in this specification is prior art known to those skilled in the art.

[0062] Although the present invention has been disclosed above with reference to embodiments, it is not intended to limit the scope of protection of the present invention. Any modifications and refinements made by those skilled in the art without departing from the concept and scope of the present invention shall fall within the scope of protection of the present invention.

Claims

1. A pipeline safety transportation method for a gas mixing concentration measurement system, characterized in that, The gas mixing concentration measurement system includes: a mixing device (01), a regenerative oxidation device (02), and a remote control information platform (03). The mixing device (01) is equipped with a low-concentration gas inlet, an air inlet, a low-temperature flue gas inlet, and a gas-mixed gas outlet. The low-concentration gas inlet, air inlet, and low-temperature flue gas inlet of the mixing device (01) are respectively connected to a low-concentration gas conveying pipe (14), an air conveying pipe (23), and a low-temperature flue gas recovery conveying pipe (33). A first regulating valve (11), a first quick shut-off valve (12), and a first gas flow meter (13) are installed on the gas delivery pipe (14). A second regulating valve (21) and a second gas flow meter (22) are installed on the air delivery pipe (23). A third regulating valve (31) and a third gas flow meter (32) are installed on the low-temperature flue gas recovery delivery pipe (33). The gas mixture outlet of the mixing device (01) is connected to the air inlet of the mixed gas delivery pipe (46), and the mixed gas delivery... The inlet port of the pipe (46) is equipped with a fourth gas flow meter (41) and a mixed gas concentration monitoring device (42). The gas mixture inlet of the regenerative oxidation device (02) is connected to the outlet port of the mixed gas conveying pipe (46). A water seal venting device (43), an induced draft fan (44), and a second quick shut-off valve (45) are installed at the outlet port of the mixed gas conveying pipe (46). The remote control information platform (03) is connected to the first regulating valve (11) and the first quick shut-off valve (45) via the Internet. 12) The first gas flow meter (13), the second regulating valve (21), the second gas flow meter (22), the third regulating valve (31), the third gas flow meter (32), the fourth gas flow meter (41), the mixed gas concentration monitoring device (42), the induced draft fan (44) and the second quick shut-off valve (45) are wirelessly connected, and the remote control information platform (03) can remotely obtain the data transmitted by the connected devices and remotely issue operation commands to the connected devices through the network; The pipeline safe transportation method includes a pipeline length selection method and a safety control method; The method for selecting the pipe length refers to, firstly, calculating and determining the range of pipe diameter for the mixed gas conveying pipe (46) based on the range of economic specific friction resistance of the mixed gas conveying pipe (46) and the maximum inlet flow rate under rated operating conditions of the regenerative oxidation device (02); secondly, based on the response time of the data acquired by the fourth gas flow meter (41), the response time of the data acquired by the mixed gas concentration monitoring device (42), the delay time of network data transmission, the response time of the remote control information platform (03), and the adjustment of the second fast shut-off valve (45). The response time is used to calculate the total system delay time from measuring the flow rate and gas concentration of the gas mixture to closing the No. 2 quick shut-off valve (45); then, based on the maximum inlet flow rate of the regenerative oxidation device (02) under rated operating conditions, the range of values ​​for the diameter of the gas mixture delivery pipe (46) and the total system delay time, the range of values ​​for the length of the gas mixture delivery pipe (46) is determined; finally, based on the pipe material price and the range of values ​​for the length of the gas mixture delivery pipe (46), the economic length value of the gas mixture delivery pipe (46) and its corresponding pipe diameter value are calculated and determined. The safety control method refers to, firstly, selecting the pipe length and pipe diameter of the mixed gas delivery pipe (46) of the gas mixing concentration measurement system based on the economic pipe length value and its corresponding pipe diameter value obtained from the pipe length selection method; then, when the gas mixing concentration measurement system is just started, opening the No. 1 quick shut-off valve (12) and the No. 2 quick shut-off valve (45), opening and adjusting the opening of the No. 1 regulating valve (11), the No. 2 regulating valve (21), and the No. 3 regulating valve (31), thereby adjusting the flow rate parameters and gas concentration parameters of the gas mixture output by the mixing device (01), so that the flow rate monitored and measured by the fourth gas flow meter (41) does not exceed the maximum inlet flow rate of the regenerative oxidation device (02) and The gas concentration monitored by the gas concentration monitoring device (42) is kept within the gas concentration range allowed by the regenerative oxidation device (02). When the gas mixing concentration measurement system is running stably, the opening of the first regulating valve (11), the second regulating valve (21) and the third regulating valve (31) are adjusted synchronously according to the gas flow rate and gas concentration value required by the operating conditions of the regenerative oxidation device (02) so that the gas flow rate parameters and gas concentration parameters of the gas mixture output by the mixing device (01) meet the requirements of the operating conditions of the regenerative oxidation device (02), and it must be ensured that the gas mixture output by the mixing device (01) is transported in the gas mixture delivery pipe (46) for a time not less than the total system delay time.

2. The pipeline safe transportation method for a gas mixing concentration measurement system according to claim 1, characterized in that, The method for selecting the pipe length includes the following steps: S1: The economical specific friction range of the mixed gas delivery pipe (46) is selected as [κ]. min κ max The maximum inlet flow rate of the regenerative thermal oxidation device (02) under rated operating conditions is G. max The diameter of the gas-mixing pipe (46) is calculated according to formula (1): In the formula: κ is the specific frictional resistance of the gas-mixing pipe (46); ρ is the density of the gas-mixing mixture; G is the flow rate of the gas-mixing mixture; D is the diameter of the gas-mixing pipe (46); λ is a coefficient; Therefore, by utilizing the range of economic specific friction of the gas-mixing pipe (46), the range of pipe diameter values ​​for the gas-mixing pipe (46) can be obtained [D]. min D max ]for S2: The response time required for the fourth gas flow meter (41) to measure flow data is a, the response time required for the mixed gas gas concentration monitoring device (42) to measure gas concentration data is b, the response time required for the remote control information platform (03) software program to process data signals and form operation command signals is c, the total network transmission delay time required for the fourth gas flow meter (41) and the mixed gas gas concentration monitoring device (42) to wirelessly transmit data signals to the remote control information platform (03) and the remote control information platform (03) to wirelessly transmit operation command signals to the second fast shut-off valve (45) is d, and the response time required for the second fast shut-off valve (45) to execute operation command signals is e. Then, the calculation method for the total system delay time τ from measuring the flow rate and gas concentration of the gas mixture to closing the second fast shut-off valve (45) is as follows: f = a + b + c + d + e (2) S3: Based on the maximum air inlet flow rate G under the rated operating conditions of the regenerative oxidation device (02) max The range of values ​​for the diameter of the mixed gas delivery pipe (46) [D] min D max ] and the total system delay time f, determine the range of values ​​for the length of the gas-mixed delivery pipe (46) [L min L max ]for Where γ is a coefficient; S4: Calculate the total cost of the pipe material for the mixed gas delivery pipe (46) using formula (2): A=ζ×((D+2α) 2 -D 2 )×L×σ×ψ (3) In the formula: ζ is a coefficient, ψ is the unit weight price of the pipe material corresponding to the mixed gas conveying pipe (46), σ is the density of the pipe material corresponding to the mixed gas conveying pipe (46), and α is the wall thickness of the mixed gas conveying pipe (46), which is obtained by searching the publicly available pipeline production standard data using the actual pipe diameter value D. Based on multiple searches of publicly available pipeline production standards, the pipe inner diameter and wall thickness values ​​corresponding to different nominal pipe diameters were obtained, ensuring that the pipe inner diameter value falls within the range of the diameter of the mixed gas conveying pipe (46) [D]. min D max Within ], the economic length of the mixed gas conveying pipe (46) is calculated using the pipe inner diameter value. Finally, the pipe inner diameter value and the economic length value are used to iterate multiple times using formula (3) to obtain the actual economically optimal total cost of pipe material. At this time, the iterative calculation stops. The pipe inner diameter value and pipe length corresponding to the economically optimal total cost of pipe material are the final pipe diameter value D0 and the final economic length value L0 of the mixed gas conveying pipe (46).

3. The pipeline safe transportation method for a gas mixing concentration measurement system according to claim 1, characterized in that, The security control method includes: Based on the economical pipe length value and its corresponding pipe diameter value obtained from the pipe length selection method, the pipe length and pipe diameter of the mixed gas delivery pipe (46) of the gas mixing concentration measurement system are selected. When the gas mixing concentration measurement system is first started, open the No. 1 quick shut-off valve (12) and the No. 2 quick shut-off valve (45), and open and adjust the opening of the No. 1 regulating valve (11), the No. 2 regulating valve (21), and the No. 3 regulating valve (31) so that the flow parameters of the gas mixture output by the mixing device (01) meet the lower limit of the flow rate required for stable operation of the regenerative oxidation device (02), and the gas concentration parameters of the gas mixture meet the lower limit of the gas concentration required for stable operation of the regenerative oxidation device (02); in the regenerative oxidation device (02) After entering a stable operating state, the flow rate and gas concentration of the gas mixture output by the mixing device (01) are increased by adjusting the opening of the first regulating valve (11), the second regulating valve (21) and the third regulating valve (31). At the same time, the actual flow rate measured by the fourth gas flow meter (41) is monitored to ensure that it does not exceed the maximum inlet flow rate of the regenerative oxidation device (02) and the actual gas concentration measured by the gas mixture gas concentration monitoring device (42) is kept within the gas concentration range allowed by the regenerative oxidation device (02). When the gas mixing concentration measurement system is running stably, the opening of the No. 1 regulating valve (11), the No. 2 regulating valve (21) and the No. 3 regulating valve (31) are adjusted synchronously according to the flow rate and gas concentration value of the gas mixture required by the actual operating conditions of the regenerative oxidation device (02) in real time, so that the flow rate parameters and gas concentration parameters of the gas mixture output by the mixing device (01) meet the requirements of the actual operating conditions of the regenerative oxidation device (02), and it must be ensured that the gas mixture output by the mixing device (01) is transported in the gas mixture conveying pipe (46) for a time not less than the total system delay time. At this time, when it is necessary to keep the flow rate of the gas mixture output by the mixing device (01) constant but the gas concentration of the gas mixture needs to be changed, the opening of the first regulating valve (11) is increased (or decreased) and the opening of the second regulating valve (21) and the third regulating valve (31) are decreased (or increased) simultaneously, so that the flow change value measured by the first gas flow meter (13) is equal to the sum of the flow change values ​​measured by the second gas flow meter (22) and the third gas flow meter (32); At this time, when it is necessary to change the flow rate of the gas mixture to keep the gas concentration of the gas mixture output by the mixing device (01) constant, the opening of the first regulating valve (11), the second regulating valve (21) and the third regulating valve (31) are increased (or decreased) simultaneously, so that the flow change value measured by the first gas flow meter (13) increases (or decreases) proportionally to the sum of the flow change values ​​measured by the second gas flow meter (22) and the third gas flow meter (32).

4. The pipeline safe transportation method for a gas mixing concentration measurement system according to claim 1, characterized in that, When the gas concentration measured by the gas concentration monitoring device (42) exceeds the upper limit of the gas concentration specified by the regenerative oxidation device (02), the No. 2 quick shut-off valve (45) is quickly shut off and the induced draft fan (44) is stopped. At this time, the water seal venting device (43) is used to purge the mixing device (01) and the gas mixture conveying pipe (46) to remove the gas mixture exceeding the upper limit of the gas concentration.

5. The pipeline safe transportation method for a gas mixing concentration measurement system according to claim 1, characterized in that, According to the requirement that the oxygen concentration of the gas mixture output by the mixing device (01) meets the lower limit of the oxygen concentration specified by the regenerative oxidation device (02), the opening of the third regulating valve (31) is increased and the opening of the second regulating valve (21) is decreased simultaneously, so that the increase in the low temperature flue gas flow rate output by the low temperature flue gas recovery and conveying pipe is equal to the decrease in the air flow rate output by the air conveying pipe (23), thereby maximizing the recovery and utilization of the waste heat of the low temperature flue gas.

6. The pipeline safe transportation method for a gas mixing concentration measurement system according to claim 1, characterized in that, The remote control information platform (03) is wired to the No. 1 regulating valve (11), the No. 1 quick shut-off valve (12), the first gas flow meter (13), the No. 2 regulating valve (21), the second gas flow meter (22), the No. 3 regulating valve (31), the third gas flow meter (32), the fourth gas flow meter (41), the mixed gas concentration monitoring device (42), the induced draft fan (44), and the No. 2 quick shut-off valve (45) via a signal transmission line. The remote control information platform (03) can remotely obtain the data transmitted by the connected devices and remotely issue operation commands to the connected devices through the signal transmission line. At this time, d in step S2 of the pipeline length selection method is the total wired transmission delay time required for the wired transmission of data signals from the fourth gas flow meter (41) and the mixed gas concentration monitoring device (42) to the remote control information platform (03) and for the wired transmission of operation command signals from the remote control information platform (03) to the second fast shut-off valve (45).

Images