A device and method for detecting mechanical water and total water content in metallurgical gas

Abstract

This invention provides a device and method for detecting the mechanical water and total water content in metallurgical coal gas. The detection device includes a gas pipeline, an exhaust pipeline, an equipment frame, and a controller. Multiple weighing scales are mounted on the equipment frame, each weighing scale suspending a drying tank. The gas pipeline, multiple drying tanks, and the exhaust pipeline are connected in series. A first flow sensor is installed on the gas pipeline, and a moisture indicator, a second temperature sensor, and a second flow sensor are installed on the exhaust pipeline. The moisture indicator is used to detect whether the coal gas in the exhaust pipeline contains mechanical water. The first flow sensor, the second temperature sensor, the second flow sensor, and all the weighing scales are connected to the controller. The controller receives data from the first flow sensor, the second temperature sensor, the second flow sensor, and all the weighing scales and automatically calculates the total water content of the coal gas to be tested. This invention employs fully automatic control and online measurement to detect the water content in coal gas.

Description

Technical Field

[0001] This invention relates to the field of coal gas moisture content detection technology, specifically to a device and method for detecting the mechanical water and total water content in metallurgical coal gas. Background Technology

[0002] In the iron and steel metallurgical industry, metallurgical gas serves as an important fuel supply for combustion in various downstream processes. Common types of metallurgical gas in large integrated steel enterprises include blast furnace gas, coke oven gas, and converter gas. Considering the different calorific values ​​required by heaters in different processes, enterprises use mixed gas for supply, effectively controlling the calorific value by adjusting the proportions of the three types of gas in the mixed gas. Rolling mill heating furnaces, as end-users, often use a mixture of blast furnace gas, coke oven gas, and converter gas as fuel. Different operating conditions and processes for different gases will cause variations in the water content of the gas. The water content in the gas affects the calorific value and enters the rolling mill heating furnace with the gas, significantly impacting the surface quality of some products (such as affecting the surface decarburization layer). Therefore, accurately measuring the mechanical water and total water content in metallurgical gas is crucial for controlling its overall water content.

[0003] Existing detection methods often employ one or more dehumidifiers to absorb moisture from the gas. After a certain amount of gas is introduced, the weight gain of the dehumidifier is measured to calculate the water content in the gas. This type of method often involves manual measurement, which introduces significant errors. Furthermore, gas is inherently dangerous, and repeated manual connection of pipelines can lead to gas leaks. Additionally, since only the gas (dry gas) after the dehumidifier is measured, the precipitation of saturated water due to changes in gas temperature is not considered, thus failing to accurately reflect the mechanical moisture content of the gas in the pipeline network.

[0004] Chinese utility model patent CN215866238U discloses a device for detecting the moisture content of converter gas, including a sampling tube, a buffer bottle, a first transparent hygroscopic tube, a second transparent hygroscopic tube, a transparent colorimetric tube, and a wet gas flow meter. One side of the sampling tube is connected to a nitrogen backflush tube, and the output end of the sampling tube is connected to the left side of the upper end of the buffer bottle, while the right side of the upper end of the buffer bottle is connected to a first conduit. The device calculates the total mechanical water content of the converter gas by weighing and adding the changes in weight of the buffer bottle, the first transparent hygroscopic tube, the second transparent hygroscopic tube, and the transparent colorimetric tube. Then, it calculates the saturated water content corresponding to the current gas temperature, and the sum of the two is the total moisture content of the converter gas. The gas flow rate is then read by the wet gas flow meter, and the moisture content per unit volume of converter gas is obtained by comparing the total moisture content with the flow rate. However, the desiccant in the first transparent absorbent tube, the second transparent absorbent tube, and the transparent color-changing tube of this device needs to be replaced after one use; otherwise, accurate testing cannot be completed. Furthermore, all weighing is done manually, which has a large error margin. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by providing a device and method for detecting the mechanical water and total water content in metallurgical coal gas. Employing fully automated control and online measurement, it can detect the water content in coal gas. It includes temperature and pressure measurement points before moisture absorption, allowing for the calculation of the in-situ water content of the coal gas. By incorporating a regeneration pipeline, the desiccant can be regenerated without disassembling the pipeline, enabling the detection device to be used repeatedly and reducing the risk of gas leakage. The detection device is equipped with a display and control module, which can directly display the final detection results without manual calculation, significantly saving manpower and material resources.

[0006] To address the aforementioned technical problems, in a first aspect, the present invention provides a device for detecting the mechanical water and total water content in metallurgical gas, comprising a gas pipeline, an exhaust pipeline, an equipment frame, and a controller. Multiple weighing scales are mounted on the equipment frame, and each weighing scale is equipped with a drying tank. A desiccant is placed in each drying tank, and the multiple drying tanks are used to completely absorb the mechanical water in the gas to be tested. Each drying tank is equipped with an inlet pipe and an outlet pipe, one end of which extends to the bottom of the drying tank. The gas pipeline, the multiple drying tanks, and the exhaust pipeline are connected in series. Valves are installed on both the gas pipeline and the exhaust pipeline. A first flow sensor is installed on the gas pipeline, and a moisture indicator, a second temperature sensor, and a second flow sensor are installed on the exhaust pipeline. The moisture indicator is used to detect whether the gas in the exhaust pipeline contains mechanical water. The first flow sensor, the second temperature sensor, the second flow sensor, and all the weighing scales are connected to the controller. The controller is used to receive data from the first flow sensor, the second temperature sensor, the second flow sensor, and all the weighing scales and automatically calculate the total water content of the gas to be tested.

[0007] Furthermore, a first pressure sensor and a first temperature sensor are installed on the gas pipeline, and a second pressure sensor is installed on the exhaust pipeline. The first pressure sensor, the first temperature sensor, and the second pressure sensor are all connected to a controller. The controller is used to receive data from the first flow sensor, the first pressure sensor, the first temperature sensor, the second temperature sensor, the second flow sensor, the second pressure sensor, and all the weighing gauges, and automatically calculate the in-situ mechanical water content of the gas to be tested.

[0008] Furthermore, a fan is installed on the exhaust pipe, and the fan is connected to the controller. The fan is used for airtightness detection and for increasing the gas flow rate when the gas pressure is low.

[0009] Furthermore, it includes a regeneration pipeline connected to a drying tank, a valve and a gas heater installed on the regeneration pipeline, and a fan used for regenerating the desiccant.

[0010] Furthermore, the desiccant is a water-absorbing molecular sieve.

[0011] Furthermore, the drying tank includes a tank body and a sealing cap, the sealing cap is sealed on the top of the tank body, and a lifting ring is provided on the sealing cap, the weight is connected to the drying tank through the lifting ring.

[0012] Furthermore, the moisture indicator is filled with color-changing silica gel particles.

[0013] Secondly, the present invention provides a method for detecting the mechanical water and total water content in metallurgical gas, comprising:

[0014] S1. Connect the gas pipeline to the gas pipeline network;

[0015] S2. Check the airtightness;

[0016] S3. Open the valve of the gas pipeline and test the mechanical water and total water content of the gas.

[0017] Further, step S1 includes: connecting the gas pipeline to the gas network, insulating the joint between the gas pipeline and the gas network, and detecting whether there is a gas leak using a gas detection device.

[0018] Further, step S2 includes: turning on the fan to evacuate the pipeline at a flow rate of 20L / min; the controller receiving data from the first pressure sensor and / or the second pressure sensor in real time; if the vacuum in the pipeline reaches -80kPa within 1 minute, the airtightness test is passed.

[0019] Further, step S3 includes:

[0020] The controller acquires the initial weight of all weighing scales, opens the valve of the gas pipeline, and acquires data in real time from the first flow sensor, the first pressure sensor, the first temperature sensor, the second temperature sensor, the second flow sensor, the second pressure sensor, and all weighing scales.

[0021] If the flow rate of the first flow sensor is less than the preset flow rate, the controller controls the fan to start, increasing the gas flow rate so that the flow rate of the first flow sensor is not less than the preset flow rate.

[0022] After the sampling time is reached, close the valve on the gas pipeline;

[0023] The controller automatically calculates the mechanical water and total water content of the gas:

[0024] The total water content of the coal gas is:

[0025] Among them, M q The total water content of the coal gas, in g / m³ 3 Mn The weight gain of the nth drying jar, in g; M T2 The saturated water content in the gas at temperature T2, in g / m³ 3 T2 is the temperature of the gas in the exhaust pipe, K; Q1 is the cumulative flow rate of the gas pipe, L; Q2 is the cumulative flow rate of the exhaust pipe, L;

[0026] The in-situ mechanical water content of the gas is:

[0027]

[0028] Where, η q The percentage of mechanical water in in-situ coal gas, %; M t1 The saturated water content in the gas at temperature T1, in g / m³ 3 T1 is the temperature of the gas in the gas pipeline, in K; P2 is the pressure of the gas in the exhaust pipeline, in Pa; P r The pressure is atmospheric pressure, in Pa.

[0029] Furthermore, the moisture indicator is used to determine whether the gas in the exhaust pipe contains mechanical water. If it does not contain mechanical water, the test result is valid. If it does contain mechanical water, the valve of the gas pipe is closed, the valve of the regeneration pipe is opened, and the gas heater and blower are turned on. The blower controls the flow rate according to the set parameters until the color change of the colored silica gel particles in the moisture indicator is completely restored, thus completing the regeneration of the desiccant.

[0030] The beneficial effects of this invention are as follows:

[0031] 1. This invention uses multiple drying tanks to completely absorb the mechanical water in the gas being tested. The total water content of the gas can be calculated by monitoring the weight changes in each drying tank, the gas flow rate, and the gas temperature in the exhaust pipe. Furthermore, the use of a moisture indicator to detect the presence of mechanical water in the exhaust pipe ensures the accuracy of the calculation. Compared to existing technologies, the moisture indicator in this invention is not used to absorb mechanical water in the gas, allowing for multiple tests with multiple drying tanks, eliminating the need for frequent replacement of drying tanks and moisture indicators. In addition, by setting up a controller to receive data from various sensors and weighing scales, the total water content of the gas being tested can be automatically calculated, resulting in more accurate results than manual measurement.

[0032] 2. This invention installs temperature sensors, pressure sensors, and flow sensors on both the gas pipeline and the exhaust pipeline, and connects them to a controller. This allows the controller to automatically calculate the in-situ mechanical water content of the gas under test based on the data from the temperature sensors, pressure sensors, flow sensors, and the weight gauge, resulting in accurate calculations.

[0033] 3. By incorporating a fan, this invention can, on the one hand, detect the airtightness of the entire detection device through the fan and pressure sensor, and on the other hand, increase the gas flow rate when the gas pressure in the gas pipeline is low. Furthermore, by connecting the controller to the fan, the controller can automatically control the fan to perform airtightness detection and control the fan speed based on the data from the pressure sensor to ensure the gas flow rate.

[0034] 4. This invention, by setting up a regeneration pipeline and a gas heater, allows outside air to be drawn into the regeneration pipeline by a fan. The outside air is heated by the gas heater and then passes through each drying tank and moisture indicator in sequence, carrying away the moisture from the desiccant in the drying tank and the color-changing silica gel particles in the moisture indicator, thereby completing the regeneration of the desiccant. There is no need to disassemble the pipeline, enabling the device to be used repeatedly and reducing the risk of gas leakage. Although there is moisture in the air, only most of the moisture in the desiccant needs to be carried away so that the desiccant can regain its ability to absorb mechanical water from the gas; it is not necessary to completely dry the desiccant. Alternatively, an inert gas (such as nitrogen) can be introduced into the regeneration pipeline, but this is more expensive.

[0035] 5. Before testing, the joint between the gas pipeline and the gas network is insulated to ensure that the inlet parameter test value can accurately reflect the state of the gas in the network.

[0036] 6. Before testing, the airtightness of the entire device is tested by a fan, ensuring the accuracy of the test results.

[0037] 7. During the detection process, the speed of the blower can be controlled by the controller to avoid low gas pressure in the gas pipeline network.

[0038] 8. This invention uses a moisture indicator to determine whether the gas in the exhaust pipe contains mechanical water, thereby ensuring the accuracy of the controller's calculations and determining whether desiccant regeneration is necessary. Attached Figure Description

[0039] Figure 1 This is a schematic diagram of the structure of the present invention.

[0040] Figure 2 This is a flowchart of the detection method of the present invention.

[0041] Reference numerals: Controller 1; First pressure sensor 21; Second pressure sensor 22; First flow sensor 31; Second flow sensor 32; First temperature sensor 41; Second temperature sensor 42; Gas heater 5; Drying tank 6; Desiccant 7; Sealing cap 8; Lifting ring 9; Weight gauge 10; Equipment frame 11; Display 12; Fan 13; Moisture indicator 14; Gas vent 15. Detailed Implementation

[0042] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0043] Example 1

[0044] like Figure 1 As shown, this embodiment provides a device for detecting the mechanical water and total water content in metallurgical gas, including a gas pipeline, an exhaust pipeline, a regeneration pipeline, an equipment frame 11, and a controller 1.

[0045] Two weighing gauges 10 are mounted on the equipment frame 11, each with a drying tank 6 suspended from it. These are designated as the first and second drying tanks. Each drying tank 6 includes a tank body and a sealing cap 8. The sealing cap 8 is sealed at the top of the tank body, and a lifting ring 9 is attached to the sealing cap 8. The weighing gauge 10 is connected to the drying tank 6 via the lifting ring 9. A desiccant 7 is placed inside the tank body. Multiple drying tanks 6 are used to completely absorb the mechanical water in the gas being tested. Each drying tank 6 has an inlet pipe and an outlet pipe, with one end of the inlet pipe extending to the bottom of the drying tank 6. Two drying tanks 6 are connected via the inlet and outlet pipes. In this embodiment, the desiccant 7 is a water-absorbing molecular sieve. The weighing gauge 10 is an electronic balance whose range should cover the entire weight of the drying tank 6 filled with desiccant 7, with a certain margin. The testing accuracy of the weighing gauge 10 should be ≥0.01g. The weighing gauge 10 has signal input and output functions, connected to the controller 1, recording the increase in total weight during the test and displaying it on the display 12.

[0046] Valves S02 and S04, as well as a first pressure sensor 21, a first flow sensor 31, and a first temperature sensor 41, are installed on the gas pipeline. One end of the gas pipeline is connected to the gas pipeline network, and the other end is connected to the inlet pipe of the first drying tank 6. The first pressure sensor 21, the first flow sensor 31, and the first temperature sensor 41 are used to detect the pressure, flow rate, and temperature of the gas entering the gas pipeline from the gas pipeline network, respectively.

[0047] A moisture indicator 14, a second pressure sensor 22, a second flow sensor 32, and a second temperature sensor 42 are installed on the exhaust pipe. One end of the exhaust pipe is connected to the outlet pipe of the second drying tank 6, and the other end is a gas vent 15. The moisture indicator 14 is filled with color-changing silica gel particles and is used to detect whether the gas in the exhaust pipe contains mechanical water. When the color of the silica gel particles changes, it indicates that the gas in the exhaust pipe contains mechanical water. The second pressure sensor 22, the second flow sensor 32, and the second temperature sensor 42 are used to detect the pressure, flow rate, and temperature of the gas discharged from the exhaust pipe, respectively.

[0048] In this embodiment, both the first pressure sensor 21 and the second pressure sensor 22 are digital pressure sensors with a range of (-0.1 to 100 kPa), a minimum response signal of 1 Pa, and a response time of ≤10 ms. The pressure signal is directly transmitted to the controller 1, which can monitor and display the changes in gas pressure in real time.

[0049] Both the first flow sensor 31 and the second flow sensor 32 are electromagnetic flow meters, which have the functions of recording total flow under working conditions and outputting signals. The signals are directly transmitted to the controller 1, which can monitor and display the flow changes and cumulative values ​​in real time during the test process.

[0050] Both the first temperature sensor 41 and the second temperature sensor 42 are K-type armored thermocouples with a range of (0~500℃) and a minimum response signal of 0.1℃. The thermocouple signal is directly transmitted to the controller 1, which can monitor and display the changes in gas temperature in real time.

[0051] The regeneration pipeline is equipped with valve S01, valve S03 and gas heater 5. Gas heater 5 is used to heat the gas entering the regeneration pipeline, thereby removing moisture from the desiccant 7 and the color-changing silica gel particles. One end of the regeneration pipeline is connected to the outside, and the other end of the regeneration pipeline is connected to the air inlet pipe of the first drying tank 6.

[0052] A blower 13 is also installed on the gas pipeline, which controls the flow rate of the fluid in the entire device. It can be understood that: First, by closing all valves and turning on blower 13, the pressure in the pipeline can be detected by a pressure sensor to check the airtightness of the testing device; Second, when valves S01 and S03 are closed and valves S02 and S04 are opened to detect the moisture content of the gas, blower 13 can control the gas flow rate to prevent low gas pressure in the gas pipeline network from affecting the detection; Third, when valves S02 and S04 are closed and valves S01, S03, and the gas heater 5 are opened, hot air can be used by blower 13 to remove moisture from the desiccant 7 and the color-changing silica gel particles, thus regenerating the desiccant 7.

[0053] In this embodiment, all valves are electrically controlled valves and equipped with a signal input / output system, which can be connected to controller 1 for control. The internal material of the valves is PTFE (to prevent corrosion from substances in the gas). A clear signal should be transmitted to controller 1 for each valve opening and closing, with a response time ≤0.5S.

[0054] Example 2

[0055] This embodiment provides a method for detecting the mechanical water and total water content in metallurgical gas, including:

[0056] S1. In the initial state, valves S01, S02, S03, and S04 are all closed. Connect the gas pipeline to the gas network, insulate the joint between the gas pipeline and the gas network, and detect gas leaks using a gas detection device. Add an appropriate amount of desiccant 7 to the drying tank 6, tighten the sealing cap 8, and connect the sealing cap 8 to the lifting ring 9.

[0057] S2. Turn on the fan 13 to evacuate the pipeline at a flow rate of 20L / min. The controller 1 receives data from the first pressure sensor 21 and / or the second pressure sensor 22 in real time. If the vacuum in the pipeline reaches -80kPa within 1 minute, the air tightness test is passed.

[0058] S3. Set parameters such as sampling time and flow rate. Controller 1 obtains the initial weight of all weighing scales 10 and opens valves S02 and S04 of the gas pipeline. Controller 1 obtains data from the first flow sensor 31, the first pressure sensor 21, the first temperature sensor 41, the second temperature sensor 42, the second flow sensor 32, the second pressure sensor 22, and all weighing scales 10 in real time.

[0059] If the flow rate of the first flow sensor 31 is less than the preset flow rate, the controller 1 controls the fan 13 to start, increasing the flow rate of the gas, so that the flow rate of the first flow sensor 31 is not less than the preset flow rate.

[0060] After the sampling time is reached, close valves S02 and S04;

[0061] Controller 1 automatically calculates the mechanical water and total water content of the gas and displays it on display 12:

[0062] The total water content of the coal gas is:

[0063] Among them, M q The total water content of the coal gas, in g / m³ 3 M n The weight gain of the nth drying jar 6, in g; M T2 The saturated water content in the gas at temperature T2, in g / m³3 T2 is the temperature of the gas in the exhaust pipe, K; Q1 is the cumulative flow rate of the gas pipe, L; Q2 is the cumulative flow rate of the exhaust pipe, L;

[0064] The in-situ mechanical water content of the gas is:

[0065]

[0066] Where, η q The percentage of mechanical water in in-situ coal gas, %; M t1 The saturated water content in the gas at temperature T1, in g / m³ 3 T1 is the temperature of the gas in the gas pipeline, in K; P2 is the pressure of the gas in the exhaust pipeline, in Pa; P r The pressure is atmospheric pressure, in Pa.

[0067] The moisture indicator 14 is used to determine whether the gas in the exhaust pipe contains mechanical water. If the color of the silica gel particles does not change, it indicates that there is no mechanical water, and the test result is valid. If the color of the silica gel particles changes, it indicates that there is mechanical water. In this case, the valve of the gas pipeline is closed, the valve of the regeneration pipeline is opened, and the gas heater 5 and the blower 13 are turned on. The blower 13 controls the flow rate according to the set parameters until the color change of the silica gel particles in the moisture indicator 14 is completely restored, thus completing the regeneration of the desiccant 7. The test is performed again after the desiccant 7 has been regenerated to avoid inaccurate test results.

[0068] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included within the protection scope of the present invention.

Claims

1. A device for detecting the mechanical water and total water content in metallurgical gas, characterized in that: The system includes a gas pipeline, an exhaust pipeline, an equipment frame (11), and a controller (1). Multiple weights (10) are mounted on the equipment frame (11), and each weight (10) is equipped with a drying tank (6). A desiccant (7) is placed in each drying tank (6). The multiple drying tanks (6) are used to completely absorb the mechanical water in the gas being tested. Each drying tank (6) has an inlet pipe and an outlet pipe, with one end of the inlet pipe extending to the bottom of the drying tank (6). The gas pipeline, the multiple drying tanks (6), and the exhaust pipeline are connected in series. Valves are installed on both the gas pipeline and the exhaust pipeline. A first flow sensor is installed on the gas pipeline. The device (31) is equipped with a moisture indicator (14), a second temperature sensor (42) and a second flow sensor (32) on the exhaust pipe. The moisture indicator (14) is used to detect whether the gas in the exhaust pipe contains mechanical water. The first flow sensor (31), the second temperature sensor (42), the second flow sensor (32) and all the weights (10) are connected to the controller (1). The controller (1) is used to receive the data from the first flow sensor (31), the second temperature sensor (42), the second flow sensor (32) and all the weights (10) and automatically calculate the total water content of the gas to be tested. A first pressure sensor (21) and a first temperature sensor (41) are installed on the gas pipeline, and a second pressure sensor (22) is installed on the exhaust pipeline. The first pressure sensor (21), the first temperature sensor (41), and the second pressure sensor (22) are all connected to the controller (1). The controller (1) is used to receive data from the first flow sensor (31), the first pressure sensor (21), the first temperature sensor (41), the second temperature sensor (42), the second flow sensor (32), the second pressure sensor (22), and all the weights (10) and automatically calculate the in-situ mechanical water content of the gas to be tested. A fan (13) is installed on the exhaust pipe. The fan (13) is connected to the controller (1). The fan (13) is used for airtightness detection and to increase the gas flow when the gas pressure is low. It also includes a regeneration pipeline connected to a drying tank (6), a valve and a gas heater (5) installed on the regeneration pipeline, and a fan (13) used for the regeneration of the desiccant (7); The moisture indicator (14) is filled with color-changing silica gel particles.

2. A detection method for the detection device for mechanical water and total water content in metallurgical gas according to claim 1, characterized in that: include: S1. Connect the gas pipeline to the gas pipeline network; S2. Check the airtightness; S3. Open the valve of the gas pipeline and test the mechanical water and total water content of the gas.

3. The detection method according to claim 2, characterized in that: Step S1 includes: connecting the gas pipeline to the gas network, insulating the joint between the gas pipeline and the gas network, and detecting whether there is a gas leak using a gas detection device.

4. The detection method according to claim 2, characterized in that: Step S2 includes: turning on the blower (13) to evacuate the pipeline at a flow rate of 20L / min. The controller (1) receives data from the first pressure sensor (21) and / or the second pressure sensor (22) in real time. If the vacuum in the pipeline reaches -80kPa within 1 minute, the air tightness test is passed.

5. The detection method according to claim 2, characterized in that: Step S3 includes: The controller (1) acquires the initial weight of all weighing scales (10), opens the valve of the gas pipeline, and the controller (1) acquires the data of the first flow sensor (31), the first pressure sensor (21), the first temperature sensor (41), the second temperature sensor (42), the second flow sensor (32), the second pressure sensor (22), and all weighing scales (10) in real time. If the flow rate of the first flow sensor (31) is less than the preset flow rate, the controller (1) controls the fan (13) to start, increasing the flow rate of the gas, so that the flow rate of the first flow sensor (31) is not less than the preset flow rate. After the sampling time is reached, close the valve on the gas pipeline; The controller (1) automatically calculates the mechanical water and total water content of the gas: The total water content of the coal gas is: Among them, M q The total water content of the coal gas, in g / m³ 3 M n The weight gain of the nth drying jar (6), in g; M T2 The saturated water content in the gas at temperature T2, in g / m³ 3 T2 is the temperature of the gas in the exhaust pipe, K; Q1 is the cumulative flow rate of the gas pipe, L; Q2 is the cumulative flow rate of the exhaust pipe, L; The in-situ mechanical water content of the gas is: Where, η q The percentage of mechanical water in in-situ coal gas, %; M T1 The saturated water content in the gas at temperature T1, in g / m³ 3 T1 is the temperature of the gas in the gas pipeline, in K; P2 is the pressure of the gas in the exhaust pipeline, in Pa; P r The pressure is atmospheric pressure, in Pa.

6. The detection method according to claim 5, characterized in that: Step S3 includes: judging whether the gas in the exhaust pipe contains mechanical water according to the moisture indicator (14). If it does not contain mechanical water, the test result is valid. If it contains mechanical water, the valve of the gas pipe is closed, the valve of the regeneration pipe is opened, the gas heater (5) and the blower (13) are turned on, and the blower (13) controls the flow rate according to the set parameters until the color change of the colored silica gel particles in the moisture indicator (14) is completely restored, and the regeneration of the desiccant (7) is completed.

Images