Sampling system and method for measuring tar and dust in coking coal gas

Abstract

The invention discloses a sampling system and method for measuring tar and dust in coking coal gas, the sampling system comprises a sampling assembly, a gas washing assembly, a gas flowmeter and a gas return assembly, the sampling assembly comprises a sampling pipe and a sampler, the sampling pipe is inserted on a coal gas main pipe, the sampling pipe is connected with the sampler, and the sampler is connected with the sampling assembly. The sampler is used for absorbing tar and dust in coal gas, the gas washing assembly is connected with the sampler, an absorption medium is arranged in the gas washing assembly, the gas flow meter is connected with the gas washing assembly, the gas return assembly comprises an anti-explosion pump and a gas return pipe, and the gas flow meter is connected with a main coal gas pipe sequentially through the anti-explosion pump and the gas return pipe. According to the invention, the tail gas after gas taking is discharged into the coal gas main pipe again, so that the pollution to the environment is avoided. And moreover, interference components which influence the gas flowmeter in the coal gas are removed by utilizing an absorption medium in the gas washing assembly, so that the purpose of protecting the flowmeter is achieved, and the service life of the flowmeter is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of chemical gas collection, and in particular to a sampling system and method for measuring tar and dust in coking coal gas. Background Art

[0002] The raw gas produced during the coking process of coal in the coke oven contains tar and dust. Tar is in gaseous state at high temperature and completely mixed with the combustible gas, but exists in liquid state below 200°C, which makes separation and treatment more difficult. This not only reduces the gasification efficiency and increases the sensible heat loss, but more seriously, it can adhere to the inner wall of the gas pipeline and the wall of the gas storage equipment, and interact with fly ash, carbon and other particulate matter in the gas, blocking the gas pipeline and affecting the operation and safety of the system. In addition, tar enters the gas purification equipment with the gas, seriously endangering the operation and service life of the equipment.

[0003] In order to reduce the impact of tar and dust in coke oven gas on production, the gas quality needs to be improved. In the process of removing tar and dust from coke oven gas, the gas is sampled and tested to determine the removal effect of tar and dust.

[0004] However, in the related art, the sampling process of coke oven gas is carried out at outdoor ambient temperature and under non-closed conditions. The exhaust gas after sampling contains harmful components, which pollutes the surrounding environment and harms human health. Non-closed sampling can cause gas leakage, resulting in waste of resources, increased production costs, reduced energy utilization, increased risks and hidden dangers of fire and explosion, and poses a serious threat to the safety of operators and equipment. Summary of the invention

[0005] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0006] To this end, an embodiment of the present invention provides a sampling system for measuring tar and dust in coking coal gas, which has the characteristics of high safety, high environmental protection and high sampling accuracy.

[0007] The sampling system for measuring tar and dust in coking coal gas according to the embodiment of the present invention comprises:

[0008] A sampling assembly, the sampling assembly comprising a sampling tube and a sampler, a portion of the sampling tube is inserted into the gas main, an outlet of the sampling tube is connected to the sampler via a pipeline, and a filter is provided in the sampler, the filter is used to absorb tar and dust in the gas;

[0009] A gas washing component, the gas washing component is connected to the sampler through a pipeline, and an absorption medium is arranged in the gas washing component, so that the gas flowing from the sampler to the gas washing component can be removed from the interfering components by the absorption medium;

[0010] A gas flow meter, the gas flow meter is connected to the gas washing component via a pipeline so that the gas flow passing through the gas washing component flows to the gas flow meter;

[0011] The gas return component includes an explosion-proof pump and a gas return pipe. The gas flow meter is connected to the gas main through a pipeline and in turn through the explosion-proof pump and the gas return pipe, so that the exhaust gas after sampling can flow back to the gas main.

[0012] The sampling system for measuring tar and dust in coking coal gas of the embodiment of the present invention discharges the exhaust gas after gas sampling back into the gas main, ensuring that the exhaust gas after gas sampling is not directly discharged into the atmosphere, avoiding pollution to the environment, and at the same time, eliminating the possibility of sampling personnel inhaling volatile toxic and harmful substances in the sample, reducing the occurrence of occupational diseases, and protecting the life safety and physical health of sampling personnel.

[0013] Furthermore, the absorption medium in the gas washing assembly is used to remove interfering components in the coal gas that affect the gas flow meter, thereby protecting the flow meter and increasing the service life of the flow meter.

[0014] In some embodiments, the sampling assembly also includes a three-way ball valve, a check valve and a ventilation pipe, the a inlet of the three-way ball valve is connected to the outlet of the sampling tube, the c outlet of the three-way ball valve is connected to the inlet of the sampler, the b outlet of the three-way ball valve is connected to the gas washing assembly via the ventilation pipe, and the check valve is arranged on the pipeline between the sampler and the gas washing assembly.

[0015] In some embodiments, the gas washing assembly includes a first buffer bottle, a dilute sulfuric acid solution bottle, a sodium hydroxide solution bottle, a copper sulfate solution bottle, a second buffer bottle and a drying tower which are connected in sequence via pipelines, the inlet of the first buffer bottle is connected to the outlet of the sampler via a pipeline and is connected to the b outlet of the three-way ball valve via the ventilation pipe, and the outlet of the drying tower is connected to the gas flow meter via a pipeline.

[0016] In some embodiments, a pressure relief pipe is provided on the pipeline between the drying tower and the gas flow meter, and a pressure relief valve is provided on the pressure relief pipe.

[0017] In some embodiments, the length of the portion of the sampling tube located inside the gas main is one-third of the inner diameter of the gas main, the end face of the inlet end of the sampling tube is a slope, and the top of the slope is located downstream of the bottom of the slope in the flow direction of the gas.

[0018] In some embodiments, the sampling assembly also includes a first short-section flange and a first pair of clamp ball valves, the first short-section flange is arranged on the outer peripheral wall of the gas main, the first pair of clamp ball valves are detachably connected to the first short-section flange, the center hole of the first pair of clamp ball valves, the center hole of the first short-section flange and the exhaust hole of the gas main are connected in sequence, the sampling tube passes through the center hole of the first pair of clamp ball valves, the center hole of the first short-section flange and the exhaust hole of the gas main in sequence, and the sampling tube is detachably connected to the first pair of clamp ball valves.

[0019] In some embodiments, the return air assembly also includes a second short-section flange, a second pair of clamp ball valve and a return air valve, the second short-section flange is arranged on the outer peripheral wall of the gas main, the second pair of clamp ball valve is detachably connected to the second short-section flange, the center hole of the second pair of clamp ball valve, the center hole of the second short-section flange and the return air hole of the gas main are connected in sequence, the end of the return air pipe is detachably connected to the second pair of clamp ball valve, and the return air valve is arranged on the return air pipe and is located upstream of the second pair of clamp ball valve.

[0020] In some embodiments, the air return assembly further includes a flow regulating valve, which is disposed on the air return pipe and located upstream of the air return valve.

[0021] In some embodiments, the gas flow meter has a temperature measuring element and a pressure measuring element.

[0022] The embodiment of the present invention also provides a sampling method for measuring tar and dust in coking coal gas.

[0023] The sampling method of the embodiment of the present invention is used in the sampling system for measuring tar and dust in coking coal gas described in any of the above embodiments, and the sampling method comprises:

[0024] Adjust the three-way ball valve to connect the sampling tube with the ventilation tube, open the return valve, start the explosion-proof pump, adjust the flow control valve, control the gas flow in the sampling system within the range of (3.5-4.0) L / min, replace the gas in the sampling system for more than 2 minutes, and after exhausting the residual gas and moisture in the sampling system, close the return valve, explosion-proof pump and three-way ball valve in turn;

[0025] After the sampling system completes gas replacement, adjust the three-way ball valve to connect the sampling tube with the sampler, open the return valve, start the explosion-proof pump, adjust the flow control valve, and control the gas flow in the sampling system within the range of (3.5~4.0)L / min. When the amount of tar and dust captured in the sampler is not less than 2mg, stop taking gas, close the return valve, explosion-proof pump and three-way ball valve in turn, remove the sampler and send it to the laboratory for measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 The figure is a schematic diagram of a sampling system for measuring tar and dust in coking coal gas according to an embodiment of the present invention.

[0027] Figure 2 Schematic diagram of a three-way ball valve according to an embodiment of the present invention.

[0028] Reference numerals:

[0029] 1-gas main; 2-sampling tube; 3-first short section flange; 4-first clamp ball valve; 5-three-way ball valve; 501-a inlet; 502-b outlet; 503-c outlet; 6-sampler; 7-check valve; 8-three-way pipe; 9-connecting pipe; 10-first buffer bottle; 11-dilute sulfuric acid solution bottle; 12-sodium hydroxide solution bottle; 13-copper sulfate solution bottle; 14-drying tower; 15-pressure relief valve; 16-gas flowmeter; 161-temperature measuring element; 162-pressure measuring element; 17-explosion-proof pump; 18-flow regulating valve; 19-return valve. DETAILED DESCRIPTION

[0030] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0031] It should be noted that before installing the sampling system for measuring tar and dust in coking coal gas according to an embodiment of the present invention, an exhaust hole and an air return hole are opened in advance on the gas main 1 so that samples in the gas main 1 can be extracted through the exhaust hole and the exhaust gas after extraction can be discharged back into the gas main 1 through the air return hole.

[0032] The hole-drilling process includes continuous pressure-drilling for delivering artificial gas, pressure-relieving purging, and cleaning of debris generated by the hole-drilling. The hole-drilling edge is not less than 50 mm from the weld on the gas main 1, and holes are not drilled in the longitudinal and circumferential welds of the main pipe of the gas main 1, square holes are not drilled at any position on the pipeline, and holes are not drilled on short joints or pipe fittings.

[0033] The following describes a sampling system for measuring tar and dust in coking coal gas according to an embodiment of the present invention in conjunction with the accompanying drawings.

[0034] like Figure 1 As shown, the sampling system for measuring tar and dust in coking coal gas according to the embodiment of the present invention comprises: a sampling component, a gas washing component, a gas flow meter 16 and a gas return component.

[0035] The sampling assembly includes a sampling tube 2 and a sampler 6. A portion of the sampling tube 2 is inserted into the gas main 1 along the radial direction of the gas main 1 through the gas extraction hole of the gas main 1. One end of the sampling tube 2 located inside the gas main 1 is a gas inlet, and one end of the sampling tube 2 located outside the gas main 1 is a gas outlet.

[0036] Alternatively, if Figure 1 As shown, the length of the portion of the sampling tube 2 located inside the gas main 1 accounts for one third of the inner diameter of the gas main 1, so as to ensure that the sampling tube 2 can accurately and effectively extract the gas sample. If the sampling tube 2 is not inserted deep enough or too deep, it will lead to inaccurate sampling or even failure to obtain the sample. In addition, the insertion of the sampling tube 2 to one third of the position also ensures that the pressure in the gas pipe will not be greatly affected during the sampling process.

[0037] Furthermore, the end face of the inlet end of the sampling tube 2 is an inclined surface, and the top end of the inclined surface is located downstream of the bottom end of the inclined surface in the flow direction of the coal gas. In other words, the end of the inlet of the sampling tube 2 is cut with a 45° groove, and the opening direction is aligned with the flow direction of the coal gas, so that the coal gas can flow into the sampling tube 2, thereby improving the effectiveness of sampling.

[0038] The outlet of the sampling tube 2 is connected to the sampler 6 through a pipeline. The sampler 6 has a filter inside. The filter is used to absorb tar and dust in the coal gas. For example, in the laboratory, the glass fiber filter membrane and the polyethylene film gasket are placed in a dryer for 2 hours, and their mass is weighed to an accuracy of 0.1 mg. After drying for 30 minutes, the weight is weighed until the difference between the two weighings does not exceed 0.3 mg. The mass is recorded and stacked in the order of rubber gasket-polyethylene film gasket-glass fiber filter membrane-polyethylene film gasket-rubber gasket. The glass fiber filter membrane has a rough surface on one side and a smooth surface on the other side. The rough surface is aligned with the airflow direction. The gasket and filter membrane are placed in the sampler 6.

[0039] Bring the sampler 6 to the coke oven gas sampling site and install it at the outlet of the sampling tube 2. It should be noted that the portion of the sampling tube 2 located outside the gas main 1 does not exceed 200 mm, thereby reducing the gas flow from the gas main 1 to the sampler 6, reducing the adhesion of tar and dust components in the sampling tube 2 and the components used to connect the sampling tube 2 and the gas main 1, and improving the accuracy of content determination.

[0040] The scrubbing assembly is connected to the sampler 6 via a pipeline. An absorption medium is arranged in the scrubbing assembly so that the coal gas flowing through the sampler 6 to the scrubbing assembly can be freed of interfering components in the coal gas through the absorption medium.

[0041] The gas flow meter 16 is connected to the scrubber assembly via a pipeline, so that the gas passing through the scrubber assembly flows to the gas flow meter 16 to measure the gas flow, temperature and pressure, etc. For example, the gas flow meter 16 has a temperature measuring element 161 and a pressure measuring element 162 .

[0042] The gas return assembly includes an explosion-proof pump 17 and a gas return pipe, and the gas flow meter 16 is connected to the gas main 1 through the pipeline and sequentially through the explosion-proof pump 17 and the gas return pipe, so that the sampled exhaust gas flows back to the gas main 1. The explosion-proof pump 17 meets the safety requirements of artificial gas sampling and measurement and improves the safety of the system.

[0043] During the sampling process, the explosion-proof pump 17 is started, and the gas in the gas main 1 is extracted through the sampling tube 2, and passes through the sampler 6, the gas washing component and the gas flow meter 16 in sequence. The tar and dust components in the gas are collected by the sampler 6 and subsequently sent to the laboratory for content determination. The exhaust gas after gas extraction is discharged back into the gas main 1 through the return pipe to achieve the purpose of closed sampling.

[0044] Therefore, the sampling system for measuring tar and dust in coking coal gas of the embodiment of the present invention discharges the exhaust gas after gas sampling back into the gas main 1, ensuring that the exhaust gas after gas sampling is not directly discharged into the atmosphere, avoiding pollution to the environment, and at the same time, eliminating the possibility of sampling personnel inhaling volatile toxic and harmful substances in the sample, reducing the occurrence of occupational diseases, and protecting the life safety and physical health of sampling personnel.

[0045] Furthermore, the absorption medium in the gas washing assembly is used to remove interfering components in the coal gas that affect the gas flow meter 16, thereby protecting the flow meter and increasing the service life of the flow meter.

[0046] In some embodiments, Figure 1 and Figure 2 As shown, the sampling assembly also includes a three-way ball valve 5, a check valve 7 and a ventilation pipe. The a inlet 501 of the three-way ball valve 5 is connected to the outlet of the sampling pipe 2, the c outlet 503 of the three-way ball valve 5 is connected to the inlet of the sampler 6, the b outlet 502 of the three-way ball valve 5 is connected to the gas washing assembly through the ventilation pipe, and the check valve 7 is arranged on the pipeline between the sampler 6 and the gas washing assembly.

[0047] Specifically, Figure 1 As shown, a three-way pipe 8 is arranged on the pipeline upstream of the scrubbing assembly, and the three-way pipe 8 is used to arrange the ventilation pipe and the sampler 6 in parallel.

[0048] It can be understood that the sampling system for measuring tar and dust in coking coal gas in the embodiment of the present invention first performs a gas replacement operation on the sampling system before performing the sampling operation to exhaust the residual gas and moisture in the sampling system, thereby improving the reliability of subsequent sampling operations and avoiding the residual gas and moisture from affecting the sampling and measurement results.

[0049] During the gas replacement process, the three-way ball valve 5 is placed in the ab position to connect the sampling tube 2 with the ventilation tube. During the sampling process, the three-way ball valve 5 is placed in the ac position to connect the sampling tube 2 with the sampler 6. The check valve 7 is provided to prevent the gas from contaminating the filter membrane in the sampler 6 during the gas replacement process, which may cause inaccurate sampling and measurement results in the subsequent sampling process.

[0050] In some embodiments, Figure 1 As shown, the gas washing assembly includes a first buffer bottle 10, a dilute sulfuric acid solution bottle 11, a sodium hydroxide solution bottle 12, a copper sulfate solution bottle 13, a second buffer bottle and a drying tower 14 which are connected in sequence via pipelines. The inlet of the first buffer bottle 10 is connected to the outlet of the sampler 6 via a pipeline and is connected to the b outlet 502 of the three-way ball valve 5 via a ventilation pipe. The outlet of the drying tower 14 is connected to the gas flow meter 16 via a pipeline.

[0051] Among them, the pipelines used to connect the first buffer bottle 10, the dilute sulfuric acid solution bottle 11, the sodium hydroxide solution bottle 12, the copper sulfate solution bottle 13, the second buffer bottle and the drying tower 14 are collectively referred to as the connecting pipe 9. The dilute sulfuric acid solution bottle 11 is filled with 10% dilute sulfuric acid solution, which is used to absorb alkaline components such as ammonia in the coal gas. The sodium hydroxide solution bottle 12 is filled with 10% sodium hydroxide solution, which is used to absorb acidic components such as hydrogen sulfide and hydrogen cyanide in the coal gas. The copper sulfate solution bottle 13 is filled with copper sulfate solution, which further absorbs the hydrogen sulfide component in the coal gas. The first buffer bottle 10 and the second buffer bottle are both empty bottles and are the same buffer bottles, which are used to stabilize the gas flow. The drying tower 14 is filled with a desiccant, which is used to remove moisture from the coal gas.

[0052] That is, the absorption medium in the above-mentioned scrubbing assembly is 10% dilute sulfuric acid solution, 10% sodium hydroxide solution, copper sulfate solution and desiccant. The above-mentioned interfering components affecting the gas flow meter 16 are alkaline components, acidic components and moisture in the coal gas.

[0053] In some embodiments, Figure 1 As shown, a pressure relief pipe is provided on the pipeline between the drying tower 14 and the gas flow meter 16, and a pressure relief valve 15 is provided on the pressure relief pipe. Specifically, a three-way pipe 8 is also provided on the pipeline between the drying tower 14 and the gas flow meter 16 to connect the pressure relief pipe.

[0054] It can be understood that the sampling system for measuring tar and dust in coking coal gas in the embodiment of the present invention balances the system pressure by opening the pressure relief valve 15 after the gas replacement operation and the sampling operation are completed to prevent the solution from being sucked back, so as to improve the reliability of the system operation.

[0055] In some embodiments, Figure 1 As shown, the sampling assembly also includes a first short-section flange 3 and a first pair of clamped ball valves 4. The first short-section flange 3 is arranged on the outer peripheral wall of the gas main 1. The first pair of clamped ball valves 4 are detachably connected to the first short-section flange 3. The center holes of the first pair of clamped ball valves 4 and the center holes of the first short-section flange 3 are connected to the exhaust holes of the gas main 1 in sequence. The sampling tube 2 passes through the center holes of the first pair of clamped ball valves 4, the center holes of the first short-section flange 3 and the exhaust holes of the gas main 1 in sequence. The sampling tube 2 is detachably connected to the first pair of clamped ball valves 4.

[0056] Optionally, the first short section flange 3 is composed of a reinforcing ring, a different diameter straight-through and flange welding. The reinforcing ring of the first short section flange 3 is welded and fixed to the outer cylindrical surface of the gas main 1. The reinforcing ring is laser cut from a stainless steel plate with an arc, and the arc facilitates better fitting and welding with the outer cylindrical surface of the gas main 1. The reinforcing ring can increase the pipe wall thickness at the opening of the gas main 1, improve the impact of the opening of the gas main 1 on the quality of the pipeline, and improve the strength of the pipeline. In addition, the reinforcing ring and the outer cylindrical surface of the gas main 1 are fully welded after being fitted, and the weld is treated for corrosion.

[0057] The first wafer ball valve 4 is a flange-type wafer ball valve, which has two flanges. The flanges are mounted on the sampling tube 2. The two flanges of the first wafer ball valve 4 are respectively fastened to the flange of the sampling tube 2 and the flange of the first short section flange 3 through sealing gaskets and bolts.

[0058] Thus, the sampling tube 2 is detachably connected to the gas main 1 by using the first clamp ball valve 4 and the first short flange 3, so as to facilitate the replacement of the sampling tube 2 that has been inserted into the gas main 1 for a long time and is corroded by gas. During the replacement process, the bolts connecting the flange of the sampling tube 2 and the flange of the first clamp ball valve 4 are removed, and the sampling tube 2 is pulled out of the gas main 1, and the first clamp ball valve 4 is closed at the same time.

[0059] In addition, the first wafer ball valve 4 is an ultra-thin wafer ball valve. Since the thickness of the first wafer ball valve 4 affects the installation length of the sampling tube 2, the ultra-thin wafer ball valve is used to further shorten the gas flow during sampling.

[0060] Similarly, if Figure 1As shown, the air return assembly also includes a second short-joint flange, a second pair of clamped ball valves and an air return valve 19. The second short-joint flange is arranged on the outer peripheral wall of the gas main 1, and the second pair of clamped ball valves are detachably connected to the second short-joint flange. The center hole of the second pair of clamped ball valves and the center hole of the second short-joint flange are connected to the air return hole of the gas main 1 in sequence. A flange is mounted on the end of the air return pipe so that the air return pipe is detachably connected to the second pair of clamped ball valves. The air return valve 19 is arranged on the air return pipe and is located upstream of the second pair of clamped ball valves.

[0061] It can be understood that the second short-section flange and the second pair of clamped ball valve are respectively the same as the above-mentioned first short-section flange 3 and the first pair of clamped ball valve 4 in structure, connection process and effect. Please refer to the above explanation and no further elaboration will be made here. The only difference is that the return air pipe does not need to be inserted in the gas main 1.

[0062] In some embodiments, Figure 1 As shown, the return gas assembly further includes a flow regulating valve 18, which is disposed on the return gas pipe and upstream of the return gas valve 19. The flow regulating valve 18 is used to control the gas flow in the entire system so that the gas flow meets the sampling and measurement standards, thereby ensuring the effectiveness of the sampling and measurement.

[0063] The following describes a sampling method for measuring tar and dust in coking coal gas according to an embodiment of the present invention.

[0064] The sampling method of the embodiment of the present invention is used in the sampling system for measuring tar and dust in coking coal gas in any of the above embodiments, and the sampling method comprises:

[0065] Adjust the three-way ball valve 5 to connect the sampling tube 2 with the ventilation tube, open the return valve 19, start the explosion-proof pump 17, adjust the flow regulating valve 18, control the gas flow in the sampling system within the range of (3.5-4.0) L / min, replace the gas in the sampling system for more than 2 minutes, and after the residual gas and moisture in the sampling system are exhausted, close the return valve 19, the explosion-proof pump 17 and the three-way ball valve 5 in turn.

[0066] After the sampling system completes gas replacement, adjust the three-way ball valve 5 to connect the sampling tube 2 with the sampler 6, open the return valve 19, start the explosion-proof pump 17, adjust the flow control valve 18, and control the gas flow in the sampling system within the range of (3.5~4.0)L / min. When the amount of tar and dust captured in the sampler 6 is not less than 2mg, stop taking gas, close the return valve 19, explosion-proof pump 17 and three-way ball valve 5 in turn, remove the sampler 6 and send it to the laboratory for measurement.

[0067] Specifically, during the gas replacement process, adjust the three-way ball valve 5 to the ab position to connect the sampling tube 2 with the gas exchange tube, open the three-way ball valve 5 and the return valve 19 to a small opening, and check the air tightness of the sampling system. After the pressure in the sampling system is balanced with the pressure of the gas main 1, there will be no bubbling in the solution bottle. If there is bubbling, the air tightness of the sampling system still needs to be checked on site.

[0068] After the system air tightness check is completed, fully open the three-way ball valve 5 and the return air valve 19, start the explosion-proof pump 17, adjust the flow control valve 18, and control the gas flow rate at (3.5~4.0) L / min through the gas flow meter 16. Use the inlet and outlet pressure difference of the pump head of the explosion-proof pump 17 to replace the gas for more than 2 minutes until the residual gas and moisture in the system are exhausted.

[0069] Close the return valve 19 and explosion-proof pump 17 in sequence, close the three-way ball valve 5 and open the pressure relief valve 15. Observe the solution bottle, and when there is no bubbling phenomenon and the pressure in the sampling system is balanced, close the pressure relief valve 15 and record the reading V1 of the gas flow meter 16.

[0070] During the sampling process, adjust the three-way ball valve 5 to the ac position to connect the sampling tube 2 with the sampler 6, open the three-way ball valve 5 and the return air valve 19 to a small degree, and check the air tightness of the sampling system. Start the explosion-proof pump 17 after there is no bubbling in the solution bottle, that is, the system pressure is balanced.

[0071] Adjust the flow control valve 18 to control the gas flow rate within the range of (3.5-4.0) L / min, and stop taking gas when the tar and dust capture amount is not less than 2 mg. After the gas is taken, close the return valve 19 and the explosion-proof pump 17 in sequence, close the three-way ball valve 5 and open the pressure relief valve 15 at the same time. Record the average gas temperature, atmospheric pressure, gas pressure and the gas flow meter 16 reading V2 during sampling. (V2-V1) is the value of the gas sampling volume under the sampling environment.

[0072] After the sampling operation is completed, the sampler 6 is removed and sent to the laboratory to determine the tar and dust content.

[0073] In summary, the sampling system adopts structures and materials that meet the requirements of safety, environmental protection, fire prevention, explosion prevention and other specifications during the design, manufacturing and installation process, so that it has good sealing and explosion-proof properties, which can effectively prevent gas leakage and safety accidents, and ensure the safety of operators and equipment.

[0074] The closed sampling method is adopted in the sampling process to ensure that the exhaust gas after gas sampling is not directly discharged into the atmosphere, avoiding pollution to the environment. At the same time, it eliminates the possibility of samplers inhaling volatile toxic and harmful substances in the samples, reduces the occurrence of occupational diseases, and protects the life safety and physical health of samplers.

[0075] Coke oven gas adopts a simple and easy-to-use closed sampling method, and the sampling personnel can complete the sampling process through simple operation steps. It does not require complex equipment and operation techniques, reduces the difficulty of operation and the error rate, and improves the sampling efficiency.

[0076] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0077] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0078] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0079] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0080] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0081] Although the above embodiments have been shown and described, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations on the present invention. Changes, modifications, substitutions and variations of the above embodiments by those of ordinary skill in the art are all within the scope of protection of the present invention.

Claims

1. A sampling system for measuring tar and dust in coking coal gas, characterized in that: include: A sampling assembly, the sampling assembly comprising a sampling tube and a sampler, a portion of the sampling tube is inserted into the gas main, an outlet of the sampling tube is connected to the sampler via a pipeline, and a filter is provided in the sampler, the filter is used to absorb tar and dust in the gas; A gas washing component, the gas washing component is connected to the sampler through a pipeline, and an absorption medium is arranged in the gas washing component, so that the gas flowing from the sampler to the gas washing component can be removed from the interfering components by the absorption medium; A gas flow meter, the gas flow meter is connected to the gas washing component via a pipeline so that the gas flow passing through the gas washing component flows to the gas flow meter; The gas return component includes an explosion-proof pump and a gas return pipe. The gas flow meter is connected to the gas main through a pipeline and in turn through the explosion-proof pump and the gas return pipe, so that the exhaust gas after sampling can flow back to the gas main.

2. The sampling system for measuring tar and dust in coking coal gas according to claim 1, characterized in that: The sampling assembly also includes a three-way ball valve, a check valve and a ventilation pipe. The a inlet of the three-way ball valve is connected to the outlet of the sampling pipe, the c outlet of the three-way ball valve is connected to the inlet of the sampler, the b outlet of the three-way ball valve is connected to the gas washing assembly via the ventilation pipe, and the check valve is arranged on the pipeline between the sampler and the gas washing assembly.

3. The sampling system for measuring tar and dust in coking coal gas according to claim 2, characterized in that: The gas washing component includes a first buffer bottle, a dilute sulfuric acid solution bottle, a sodium hydroxide solution bottle, a copper sulfate solution bottle, a second buffer bottle and a drying tower which are connected in sequence via pipelines. The inlet of the first buffer bottle is connected to the outlet of the sampler via a pipeline and is connected to the b outlet of the three-way ball valve via the ventilation pipe. The outlet of the drying tower is connected to the gas flow meter via a pipeline.

4. The sampling system for measuring tar and dust in coking coal gas according to claim 3, characterized in that: A pressure relief pipe is provided on the pipeline between the drying tower and the gas flow meter, and a pressure relief valve is provided on the pressure relief pipe.

5. The sampling system for measuring tar and dust in coking coal gas according to claim 1, characterized in that: The length of the portion of the sampling tube located inside the gas main is one third of the inner diameter of the gas main. The end face of the inlet end of the sampling tube is a slope, and the top of the slope is located downstream of the bottom of the slope in the flow direction of the gas.

6. According to claim 1, the sampling system for measuring tar and dust in coking coal gas, the sampling assembly also includes a first short-section flange and a first pair of clamp ball valves, the first short-section flange is arranged on the outer peripheral wall of the gas main, the first pair of clamp ball valves are detachably connected to the first short-section flange, the center hole of the first pair of clamp ball valves, the center hole of the first short-section flange and the exhaust hole of the gas main are connected in sequence, the sampling tube passes through the center hole of the first pair of clamp ball valves, the center hole of the first short-section flange and the exhaust hole of the gas main in sequence, and the sampling tube is detachably connected to the first pair of clamp ball valves.

7. The sampling system for measuring tar and dust in coking coal gas according to claim 4, characterized in that: The air return assembly also includes a second short-section flange, a second pair of clamp ball valves and an air return valve. The second short-section flange is arranged on the outer peripheral wall of the gas main. The second pair of clamp ball valves are detachably connected to the second short-section flange. The center hole of the second pair of clamp ball valve and the center hole of the second short-section flange are connected to the air return hole of the gas main in sequence. The end of the air return pipe is detachably connected to the second pair of clamp ball valves. The air return valve is arranged on the air return pipe and is located upstream of the second pair of clamp ball valves.

8. The sampling system for measuring tar and dust in coking coal gas according to claim 7, characterized in that: The air return assembly further includes a flow regulating valve, which is arranged on the air return pipe and located upstream of the air return valve.

9. The sampling system for measuring tar and dust in coking coal gas according to any one of claims 1 to 8, characterized in that: The gas flow meter is provided with a temperature measuring element and a pressure measuring element.

10. A sampling method for measuring tar and dust in coking coal gas, characterized in that: The sampling method is used in the sampling system for measuring tar and dust in coking coal gas as claimed in claim 8, and the sampling method comprises: Adjust the three-way ball valve to connect the sampling tube with the ventilation tube, open the return valve, start the explosion-proof pump, adjust the flow control valve, control the gas flow in the sampling system within the range of (3.5-4.0) L / min, replace the gas in the sampling system for more than 2 minutes, and after exhausting the residual gas and moisture in the sampling system, close the return valve, explosion-proof pump and three-way ball valve in turn; After the sampling system completes gas replacement, adjust the three-way ball valve to connect the sampling tube with the sampler, open the return valve, start the explosion-proof pump, adjust the flow control valve, and control the gas flow in the sampling system within the range of (3.5~4.0)L / min. When the amount of tar and dust captured in the sampler is not less than 2mg, stop taking gas, close the return valve, explosion-proof pump and three-way ball valve in turn, remove the sampler and send it to the laboratory for measurement.

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