Sampling system and sampling method for measuring content of hydrogen sulfide in coke oven gas

Abstract

The invention discloses a sampling system and method for measuring hydrogen sulfide content in coke oven gas, the sampling system comprises an extraction assembly, a collection assembly, a processing assembly, a flowmeter and a backflow assembly, the extraction assembly comprises a sampling pipe, the sampling pipe is inserted in a gas pipeline, the collection assembly comprises a collection bottle, the collection bottle is connected with the sampling pipe through a pipeline, and the processing assembly is connected with the flowmeter. The treatment assembly is connected with the collection bottle, an absorption medium is arranged in the treatment assembly, the flowmeter is connected with the treatment assembly, the backflow assembly comprises an extraction pump and a backflow pipe, the extraction pump is connected with the flowmeter and the backflow pipe, and the backflow pipe is connected with the gas pipeline. The tail gas after gas taking is discharged into the gas pipeline again, it is guaranteed that the tail gas after gas taking is not directly discharged into the atmosphere, and pollution to the environment is avoided. The absorption medium in the processing assembly is used for removing interference components influencing the flowmeter in the coal gas, 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 sampling and detection, and in particular to a sampling system and a sampling method for measuring the content of hydrogen sulfide in coke oven gas. Background Art

[0002] Production practice shows that 30% to 40% of the sulfur in the raw coal for high-temperature coking enters the coke oven gas in the form of gaseous sulfides during the coking process. Sulfides in the gas can be divided into two categories according to their chemical state: one is inorganic sulfur compounds, mainly hydrogen sulfide (H2S); the other is organic sulfur compounds, such as carbon disulfide (CS2), carbon oxysulfide (COS), thiophene (C4H4S), etc. The content of organic sulfides is relatively small, at 0.3g / m 3 When the conversion reaction is carried out at a higher temperature, almost all of it is converted into hydrogen sulfide.

[0003] Hydrogen sulfide in coke oven gas is a harmful substance. It will corrode chemical product recovery equipment and gas storage and transportation equipment, resulting in increased equipment maintenance costs and endangering production safety. Secondly, hydrogen sulfide in coke oven gas will affect its quality of use. It will reduce the quality of steel when used in steelmaking, poison catalysts and corrode equipment when used in synthetic ammonia production, and when used as city gas, the sulfur dioxide produced by the combustion of hydrogen sulfide is toxic, which will damage environmental hygiene and affect human health. Finally, the desulfurization of coke oven gas can also recover sulfur, which is a valuable by-product that can be used in other production fields.

[0004] In summary, removing hydrogen sulfide from coke oven gas can not only reduce equipment corrosion and lower operating costs, but also improve the quality of coke oven gas, protect the environment, and recycle resources, which has important economic, environmental and social significance.

[0005] The desulfurization effect of coke oven gas is tested by measuring the hydrogen sulfide content of the gas entering and leaving the desulfurization tower. The hydrogen sulfide content in coke oven gas is measured by absorbing the hydrogen sulfide in the gas with zinc ammonia complex solution and then sending it to the laboratory for content measurement.

[0006] However, in the related art, the sampling process of coke oven gas is carried out under non-closed conditions. The exhaust gas after sampling contains harmful components, which pollutes the surrounding environment and harms human health. Non-closed sampling may cause gas leakage, resulting in waste of resources, increased production costs, and reduced energy utilization efficiency; it increases the risk and hidden dangers of fire and explosion, and poses a serious threat to the safety of operators and equipment. Summary of the invention

[0007] The present invention is based on the inventor's discovery and understanding of the following facts and problems:

[0008] In the related art, the technical disadvantages and problems of the gas sampling device used to determine the hydrogen sulfide content in coke oven gas are that the design of the sampling device does not meet the requirements of airtightness, and the exhaust gas after coke oven gas sampling is usually directly discharged, causing harm and pollution to the health of the sampling personnel and the environment.

[0009] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0010] To this end, an embodiment of the present invention provides a sampling system for measuring the hydrogen sulfide content in coke oven gas. The sampling system has the characteristics of high safety, high environmental protection and high sampling accuracy.

[0011] The sampling system for measuring the hydrogen sulfide content in coke oven gas according to the embodiment of the present invention comprises:

[0012] A sampling assembly, the sampling assembly comprising a sampling tube, a portion of which is inserted into the gas pipeline;

[0013] A collecting assembly, the collecting assembly comprising a collecting bottle, the inlet of the collecting bottle being connected to the sampling tube via a pipeline, the collecting bottle being filled with an absorption liquid, the absorption liquid being used to collect hydrogen sulfide in the coal gas flowing into the collecting bottle through the sampling tube;

[0014] A processing component, the processing component is connected to the outlet of the collecting bottle via a pipeline, and an absorption medium is arranged in the processing component, so that the coal gas flowing from the collecting bottle to the processing component is removed from the interfering components by the absorption medium;

[0015] A flow meter, the flow meter is connected to the processing component via a pipeline so that the coal gas flowing through the processing component flows to the flow meter;

[0016] A reflux component, the reflux component includes an extraction pump and a reflux pipe, the extraction pump is connected to the flow meter and the reflux pipe via a pipeline, and the reflux pipe is connected to the gas pipeline, so that the gas passing through the flow meter flows back to the gas pipeline through the extraction pump and the reflux pipe in sequence.

[0017] The sampling system for determining the hydrogen sulfide content in coke oven gas of the embodiment of the present invention discharges the exhaust gas after gas sampling back into the gas pipeline, ensuring that the exhaust gas after gas sampling is not directly discharged into the atmosphere, thus avoiding environmental pollution. At the same time, it eliminates the possibility of sampling personnel inhaling volatile toxic and harmful substances in the sample, reduces the occurrence of occupational diseases, and protects the life safety and physical health of sampling personnel.

[0018] Furthermore, the absorption medium in the treatment component is used to remove interfering components in the coal gas that affect the flow meter, thereby protecting the flow meter and increasing the service life of the flow meter.

[0019] In some embodiments, the extraction assembly also includes a first pair of clamp ball valves and a sampling valve. The first pair of clamp ball valves are arranged on the outer wall of the gas pipeline. The center hole of the first pair of clamp ball valves is connected to the extraction hole of the gas pipeline. The sampling tube passes through the center hole of the first pair of clamp ball valves and the extraction hole of the gas pipeline in sequence. The sampling tube is detachably connected to the first pair of clamp ball valves. The sampling valve is arranged on the sampling tube and is located downstream of the first pair of clamp ball valves.

[0020] In some embodiments, the collection component also includes a replacement tube, a replacement valve, a front valve and a rear valve, the two ends of the replacement tube are respectively connected to the sampling tube and the processing component, so that the replacement tube and the collection bottle are arranged in parallel, the replacement valve is arranged on the replacement tube, the front valve is arranged on the pipeline between the sampling tube and the collection bottle, and the rear valve is arranged on the pipeline between the collection bottle and the processing component.

[0021] In some embodiments, the processing component includes a dilute sulfuric acid absorption bottle, a sodium hydroxide absorption bottle, a copper sulfate absorption bottle, a buffer bottle and a drying bottle connected in sequence via pipelines, the collecting bottle and the replacement tube are respectively connected to the dilute sulfuric acid absorption bottle via pipelines, and the drying bottle is connected to the flowmeter via a pipeline.

[0022] In some embodiments, a pressure relief pipe is provided on the pipeline between the drying bottle and the flow meter, and a pressure relief valve is provided on the pressure relief pipe.

[0023] In some embodiments, the flow meter has a temperature measuring element and a pressure measuring element.

[0024] In some embodiments, the reflux assembly also includes a second pair of clamped ball valves and a reflux valve, wherein the second pair of clamped ball valves are arranged on the outer peripheral wall of the gas pipeline, the center hole of the second pair of clamped ball valves is connected to the reflux hole of the gas pipeline, the reflux pipe is detachably connected to the second pair of clamped ball valves, and the reflux valve is arranged on the reflux pipe and located upstream of the second pair of clamped ball valves.

[0025] In some embodiments, the reflux component further includes a flow regulating valve, which is disposed on the reflux pipe and located upstream of the reflux valve.

[0026] The embodiment of the present invention also provides a sampling method for measuring the hydrogen sulfide content in coke oven gas.

[0027] The sampling method of the embodiment of the present invention is used in the sampling system for measuring the hydrogen sulfide content in coke oven gas described in any of the above embodiments, and the sampling method comprises:

[0028] Open the sampling valve, reflux valve and replacement valve in sequence, start the extraction pump, adjust the flow control valve, control the gas flow in the sampling system at (0.25-1.0) L / min through the flow meter, 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 reflux valve, extraction pump, sampling valve and replacement valve in sequence;

[0029] After the sampling system completes gas replacement, first open the front valve and the rear valve in sequence, then open the sampling valve and the reflux valve in sequence, start the extraction pump, fine-tune the flow regulating valve, control the gas flow in the sampling system within the preset range, and stop sampling when the amount of hydrogen sulfide absorbed in the collection bottle reaches the preset value. Close the reflux valve, extraction pump and sampling valve in sequence, and close the front valve and the rear valve at the same time. Remove the collection bottle and send it to the laboratory to determine the hydrogen sulfide content.

[0030] In some embodiments, the gas flow rate of the sampling system during the sampling process and the amount of hydrogen sulfide absorbed by the collection bottle when the sampling is completed are adjusted according to the hydrogen sulfide content in the coal gas to be tested;

[0031] If the hydrogen sulfide content in the gas is (1-30) mg / m 3 When the sampling system is in the process of sampling, the gas flow rate is (0.25-0.5) L / min, and the amount of hydrogen sulfide absorbed by the collection bottle is (0.005-0.03) mg when the sampling is completed;

[0032] If the hydrogen sulfide content in the gas is 10 mg / m 3 When the above conditions are met, the gas flow rate of the sampling system during the sampling process is (0.5-1.0) L / min, and the amount of hydrogen sulfide absorbed by the collecting bottle when the sampling is completed is (0.85-35) mg. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 Schematic diagram of a sampling system for measuring the content of hydrogen sulfide in coke oven gas according to an embodiment of the present invention.

[0034] Reference numerals:

[0035] 1-gas pipeline; 2-sampling tube; 3-first pair of clamped ball valves; 4-sampling valve; 5-tee pipe; 6-displacement valve, 7-front valve; 8-rear valve; 9-collecting bottle; 10-connecting pipe; 11-dilute sulfuric acid absorption bottle; 12-sodium hydroxide absorption bottle; 13-copper sulfate absorption bottle; 14-buffer bottle; 15-drying bottle; 16-pressure relief valve; 17-flow meter; 171-temperature measuring element; 172-pressure measuring element; 18-extraction pump; 19-flow regulating valve; 20-reflux valve. DETAILED DESCRIPTION

[0036] 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.

[0037] It should be noted that before installing the sampling system for measuring the hydrogen sulfide content in coke oven gas according to the embodiment of the present invention, an extraction hole and a reflux hole are opened in advance on the gas pipeline 1 so that samples in the gas pipeline 1 can be extracted through the extraction hole later, and the exhaust gas after gas extraction can be discharged back into the gas pipeline 1 through the reflux hole.

[0038] 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 edge of the hole-drilling is not less than 50 mm from the weld on the gas pipeline 1, and the hole is not drilled in the longitudinal or circumferential weld of the main pipe of the gas pipeline 1, and no square hole is drilled at any position on the pipeline, and no hole is drilled on the short joint or pipe fitting.

[0039] The sampling system for measuring the hydrogen sulfide content in coke oven gas according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

[0040] like Figure 1 As shown, the sampling system for measuring the hydrogen sulfide content in coke oven gas according to the embodiment of the present invention comprises: an extraction component, a collection component, a processing component, a flow meter 17 and a reflux component.

[0041] The extraction component includes a sampling tube 2, a portion of which is radially along the gas pipeline 1 and inserted into the gas pipeline 1 through the extraction hole of the gas pipeline 1. One end of the sampling tube 2 located inside the gas pipeline 1 is an inlet, and one end of the sampling tube 2 located outside the gas pipeline 1 is an outlet.

[0042] The collecting assembly includes a collecting bottle 9 , the inlet of which is connected to the outlet of the sampling tube 2 via a pipeline. The collecting bottle 9 is filled with an absorption liquid, which is used to collect hydrogen sulfide in the coal gas flowing into the collecting bottle 9 through the sampling tube 2 .

[0043] The processing assembly is connected to the outlet of the collecting bottle 9 via a pipeline, and an absorption medium is arranged in the processing assembly so that the coal gas flowing through the collecting bottle 9 to the processing assembly can be freed of interfering components in the coal gas through the absorption medium.

[0044] The flow meter 17 is connected to the processing assembly via a pipeline so that the gas passing through the processing assembly flows to the flow meter 17. The flow meter 17 is used to measure the flow rate, temperature and pressure of the extracted gas. For example, the flow meter 17 has a temperature measuring element 171 and a pressure measuring element 172.

[0045] The reflux component includes an extraction pump 18 and a reflux pipe. The extraction pump 18 is connected to the flow meter 17 and the reflux pipe via a pipeline. The reflux pipe is connected to the gas pipeline 1 so that the gas passing through the flow meter 17 flows back to the gas pipeline 1 through the extraction pump 18 and the reflux pipe in turn.

[0046] During the sampling process, the extraction pump 18 is started to extract the gas in the gas pipeline 1 through the extraction pipe 2, and pass through the collecting bottle 9, the processing component and the flow meter 17 in sequence. The hydrogen sulfide in the gas is collected by the collecting bottle 9 and then sent to the laboratory to determine the hydrogen sulfide content. The exhaust gas after gas extraction is discharged back into the gas pipeline 1 through the reflux pipe to achieve the purpose of closed sampling.

[0047] Therefore, the sampling system for determining the hydrogen sulfide content in coke oven gas according to the embodiment of the present invention discharges the exhaust gas after gas sampling back into the gas pipeline 1, ensuring that the exhaust gas after gas sampling is not directly discharged into the atmosphere, thus avoiding environmental pollution. At the same time, it eliminates the possibility of sampling personnel inhaling volatile toxic and harmful substances in the sample, reduces the occurrence of occupational diseases, and protects the life safety and physical health of sampling personnel.

[0048] Furthermore, the interfering components in the coal gas that affect the flow meter 17 are removed by utilizing the absorption medium in the processing assembly, thereby achieving the purpose of protecting the flow meter 17 and increasing the service life of the flow meter 17 .

[0049] In some embodiments, Figure 1 As shown, the extraction assembly also includes a first pair of clamped ball valves 3 and a sampling valve 4.

[0050] The first pair of clamp ball valves 3 are arranged on the outer peripheral wall of the gas pipeline 1, and the center hole of the first pair of clamp ball valves 3 is connected to the extraction hole of the gas pipeline 1. The sampling tube 2 passes through the center hole of the first pair of clamp ball valves 3 and the extraction hole of the gas pipeline 1 in sequence, and the sampling tube 2 is detachably connected to the first pair of clamp ball valves 3. For example, a flange is mounted on the sampling tube 2, and a sealing gasket and a bolt are used to realize that the flange of the sampling tube 2 and the flange of the first pair of clamp ball valves 3 are detachably sealed and connected, so as to facilitate the replacement of the sampling tube 2 that has been inserted in the gas pipeline 1 for a long time and corroded by gas, thereby improving the convenience of operation. The sampling valve 4 is arranged on the sampling tube 2 and is located downstream of the first pair of clamp ball valves 3. The sampling valve 4 is used to control the on and off of the sampling tube 2.

[0051] Similarly, the connection method of the return pipe is the same as that of the sampling pipe 2, except that the return pipe does not need to be inserted into the gas pipeline 1. Figure 1As shown, the reflux assembly also includes a second pair of wafer ball valves and a reflux valve 20. The second pair of wafer ball valves are arranged on the outer peripheral wall of the gas pipeline 1. The central hole of the second pair of wafer ball valves is connected to the reflux hole of the gas pipeline 1. The end of the reflux pipe is fitted with a flange so that the reflux pipe and the second pair of wafer ball valve are detachably connected to facilitate the replacement of the reflux pipe. The reflux valve 20 is arranged on the reflux pipe and is located upstream of the second pair of wafer ball valve. The reflux valve 20 is used to control the on and off of the reflux pipe.

[0052] In some embodiments, Figure 1 As shown, the collection assembly further includes a replacement tube, a replacement valve 6 , a front valve 7 and a rear valve 8 .

[0053] The two ends of the displacement tube are connected to the sampling tube 2 and the processing assembly, respectively, so that the displacement tube and the collection bottle 9 are arranged in parallel. Specifically, a three-way tube 5 is arranged at the outlet of the sampling tube 2, and the other two ports of the three-way tube 5 connected to the sampling tube 2, one of which is connected to the inlet of the displacement tube, and the other port is connected to the inlet of the collection bottle 9 through a pipeline. Similarly, a three-way tube 5 is arranged on the pipeline leading out of the processing assembly, one of which is connected to the outlet of the displacement tube, and the other port is connected to the outlet of the collection bottle 9 through a pipeline.

[0054] The replacement valve 6 is arranged on the replacement pipe, the front valve 7 is arranged on the pipeline between the three-way pipe 5 connected to the sampling pipe 2 and the inlet of the collecting bottle 9, and the rear valve 8 is arranged on the pipeline between the three-way pipe 5 connected to the outlet of the collecting bottle 9 and the pipeline leading out of the processing component.

[0055] It can be understood that, before the sampling operation is performed, the sampling system for determining the hydrogen sulfide content in coke oven gas in the embodiment of the present invention first performs a gas replacement operation on the sampling system 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.

[0056] In some embodiments, Figure 1 As shown, the treatment assembly includes a dilute sulfuric acid absorption bottle 11, a sodium hydroxide absorption bottle 12, a copper sulfate absorption bottle 13, a buffer bottle 14 and a drying bottle 15 which are sequentially connected via pipelines. The collecting bottle 9 and the displacement tube are respectively connected to the dilute sulfuric acid absorption bottle 11 via pipelines, and the drying bottle 15 is connected to the flow meter 17 via pipelines.

[0057] Among them, the pipelines used to connect the dilute sulfuric acid absorption bottle 11, the sodium hydroxide absorption bottle 12, the copper sulfate absorption bottle 13, the buffer bottle 14 and the drying bottle 15 are collectively referred to as the connecting pipe 10. The dilute sulfuric acid absorption 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 absorption 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 absorption bottle 13 is filled with copper sulfate solution to further absorb the hydrogen sulfide component in the coal gas. The buffer bottle 14 is an empty bottle for smooth gas flow. The drying bottle 15 is filled with desiccant to remove moisture from the coal gas.

[0058] That is, the absorption medium in the above-mentioned treatment component is 10% dilute sulfuric acid solution, 10% sodium hydroxide solution, copper sulfate solution and desiccant. The above-mentioned interference components affecting the flow meter 17 are alkaline components, acidic components and moisture in the coal gas.

[0059] In some embodiments, Figure 1 As shown, a pressure relief pipe is provided on the pipeline between the drying bottle 15 and the flow meter 17, and a pressure relief valve 16 is provided on the pressure relief pipe. Specifically, a three-way pipe 5 is provided on the pipeline between the drying bottle 15 and the flow meter 17, and the remaining one end of the three-way pipe 5 is connected to the pressure relief pipe.

[0060] It is understandable that the sampling system for measuring the hydrogen sulfide content in coke oven gas according to the embodiment of the present invention balances the system pressure by opening the pressure relief valve 16 after the gas replacement operation and the sampling operation are completed to prevent the solution from being sucked back, thereby improving the reliability of the system operation.

[0061] In some embodiments, Figure 1 As shown, the reflux assembly further includes a flow regulating valve 19, which is disposed on the reflux pipe and upstream of the reflux valve 20. The flow regulating valve 19 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.

[0062] The following describes a sampling method for measuring the hydrogen sulfide content in coke oven gas according to an embodiment of the present invention.

[0063] The sampling method of the embodiment of the present invention is used in the sampling system for measuring the hydrogen sulfide content in coke oven gas in any of the above embodiments, and the sampling method comprises:

[0064] Open the sampling valve 4, the reflux valve 20 and the replacement valve 6 in sequence, start the extraction pump 18, adjust the flow regulating valve 19, control the gas flow in the sampling system at (0.25~1.0)L / min through the flow meter 17, replace the gas in the sampling system for more than 2 minutes, and after the residual gas and moisture in the sampling system are completely discharged, close the reflux valve 20, the extraction pump 18, the sampling valve 4 and the replacement valve 6 in sequence.

[0065] After the sampling system completes gas replacement, first open the front valve 7 and the rear valve 8 in sequence, then open the sampling valve 4 and the reflux valve 20 in sequence, start the extraction pump 18, fine-tune the flow regulating valve 19, control the gas flow in the sampling system within a preset range, and stop sampling when the amount of hydrogen sulfide absorbed in the collecting bottle 9 reaches a preset value, close the reflux valve 20, the extraction pump 18 and the sampling valve 4 in sequence, and close the front valve 7 and the rear valve 8 at the same time, remove the collecting bottle 9 and send it to the laboratory to determine the hydrogen sulfide content.

[0066] The gas flow rate of the sampling system during the sampling process and the amount of hydrogen sulfide absorbed by the collecting bottle 9 when the sampling is completed are adjusted according to the hydrogen sulfide content in the coal gas to be tested, so as to ensure the rationality and effectiveness of the sampling.

[0067] If the hydrogen sulfide content in the gas is (1-30) mg / m 3 When the sampling is completed, the gas flow rate of the sampling system during the sampling process is (0.25-0.5) L / min, and the amount of hydrogen sulfide absorbed by the collecting bottle 9 is (0.005-0.03) mg.

[0068] If the hydrogen sulfide content in the gas is 10 mg / m 3 In the above case, the gas flow rate of the sampling system during the sampling process is (0.5-1.0) L / min, and the amount of hydrogen sulfide absorbed by the collecting bottle 9 when the sampling is completed is (0.85-35) mg.

[0069] Specifically, during the gas replacement process, the sampling valve 4, the reflux valve 20 and the replacement valve 6 are opened to a small degree in sequence to check the air tightness of the sampling system. After the pressure in the sampling system is balanced with the pressure in the gas pipeline 1, there is no bubbling in the solution bottle. If there is bubbling, the air tightness of the sampling system still needs to be checked on site.

[0070] After the system air tightness check is completed, fully open the sampling valve 4, reflux valve 20 and replacement valve 6, start the extraction pump 18, adjust the flow control valve 19, control the gas flow rate at (0.25~1.0)L / min through the flow meter 17, and use the inlet and outlet pressure difference of the pump head of the extraction pump 18 to replace the gas for more than 2 minutes until the residual gas and moisture in the system are exhausted.

[0071] Close the reflux valve 20 and the extraction pump 18 in sequence, close the sampling valve 4, open the pressure relief valve 16, and close the displacement valve 6. 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 16 and record the flow meter 17 reading as V1.

[0072] During the sampling process, open the front valve 7 and the rear valve 8, and then open the sampling valve 4 and the reflux valve 20 to a small degree, and check the air tightness of the sampling system. When there is no bubbling in the collection bottle 9 and the solution bottle, that is, when the system pressure is balanced, start the extraction pump 18.

[0073] Fine-tune the flow control valve 19. If the hydrogen sulfide content in the measured gas is between (1 and 30) mg / m 3 When the gas flow rate in the control system is (0.25-0.5) L / min, the gas extraction is stopped when the amount of hydrogen sulfide to be absorbed is (0.005-0.03) mg. If the hydrogen sulfide content in the measured coal gas is 10 mg / m 3 When the above value is reached, the gas flow rate in the control system is (0.5~1.0) L / min, and gas extraction is stopped when the amount of hydrogen sulfide to be absorbed is (0.85~35) mg.

[0074] After the gas extraction is completed, the reflux valve 20 and the extraction pump 18 are closed in sequence, the sampling valve 4 is closed and the pressure relief valve 16 is opened. The average temperature of the gas, the atmospheric pressure, the gas pressure and the reading V2 of the flow meter 17 during the sampling are recorded, and (V2-V1) is the value of the gas sampling volume under the sampling environment.

[0075] Close the front valve 7 and the rear valve 8, remove the two 250mL cylindrical gas washing bottles (collecting bottles 9), and use soft polyethylene tubes to short-circuit the inlet and outlet of the two washing bottles. After the sampling operation is completed, send the washing bottles to the laboratory to determine the hydrogen sulfide content.

[0076] 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.

[0077] 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.

[0078] 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.

[0079] 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.

[0080] 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.

[0081] 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.

[0082] 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.

[0083] 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.

[0084] 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 the content of hydrogen sulfide in coke oven gas, characterized in that: include: A sampling assembly, the sampling assembly comprising a sampling tube, a portion of which is inserted into the gas pipeline; A collecting assembly, the collecting assembly comprising a collecting bottle, the inlet of the collecting bottle being connected to the sampling tube via a pipeline, the collecting bottle being filled with an absorption liquid, the absorption liquid being used to collect hydrogen sulfide in the coal gas flowing into the collecting bottle through the sampling tube; A processing component, the processing component is connected to the outlet of the collecting bottle via a pipeline, and an absorption medium is arranged in the processing component, so that the coal gas flowing from the collecting bottle to the processing component is removed from the interfering components by the absorption medium; A flow meter, the flow meter is connected to the processing component via a pipeline so that the coal gas flowing through the processing component flows to the flow meter; A reflux component, the reflux component includes an extraction pump and a reflux pipe, the extraction pump is connected to the flow meter and the reflux pipe via a pipeline, and the reflux pipe is connected to the gas pipeline, so that the gas passing through the flow meter flows back to the gas pipeline through the extraction pump and the reflux pipe in sequence.

2. The sampling system for measuring the hydrogen sulfide content in coke oven gas according to claim 1, characterized in that: The extraction component also includes a first pair of clamp ball valves and a sampling valve. The first pair of clamp ball valves are arranged on the outer peripheral wall of the gas pipeline. The center hole of the first pair of clamp ball valves is connected to the extraction hole of the gas pipeline. The sampling tube passes through the center hole of the first pair of clamp ball valves and the extraction hole of the gas pipeline in sequence. The sampling tube is detachably connected to the first pair of clamp ball valves. The sampling valve is arranged on the sampling tube and is located downstream of the first pair of clamp ball valves.

3. The sampling system for measuring the hydrogen sulfide content in coke oven gas according to claim 2, characterized in that: The collection component also includes a replacement tube, a replacement valve, a front valve and a rear valve. The two ends of the replacement tube are respectively connected to the sampling tube and the processing component so that the replacement tube and the collection bottle are arranged in parallel. The replacement valve is arranged on the replacement tube, the front valve is arranged on the pipeline between the sampling tube and the collection bottle, and the rear valve is arranged on the pipeline between the collection bottle and the processing component.

4. The sampling system for measuring the hydrogen sulfide content in coke oven gas according to claim 3, characterized in that: The processing assembly includes a dilute sulfuric acid absorption bottle, a sodium hydroxide absorption bottle, a copper sulfate absorption bottle, a buffer bottle and a drying bottle which are sequentially connected via pipelines; the collecting bottle and the displacement tube are respectively connected to the dilute sulfuric acid absorption bottle via pipelines; and the drying bottle is connected to the flow meter via a pipeline.

5. The sampling system for measuring the hydrogen sulfide content in coke oven gas according to claim 4, characterized in that: A pressure relief pipe is provided on the pipeline between the drying bottle and the flow meter, and a pressure relief valve is provided on the pressure relief pipe.

6. The sampling system for measuring the hydrogen sulfide content in coke oven gas according to claim 1, characterized in that: The flow meter is provided with a temperature measuring element and a pressure measuring element.

7. The sampling system for measuring the hydrogen sulfide content in coke oven gas according to claim 5, characterized in that: The reflux assembly also includes a second pair of clamped ball valves and a reflux valve. The second pair of clamped ball valves are arranged on the outer peripheral wall of the gas pipeline. The center hole of the second pair of clamped ball valves is connected to the reflux hole of the gas pipeline. The reflux pipe is detachably connected to the second pair of clamped ball valves. The reflux valve is arranged on the reflux pipe and is located upstream of the second pair of clamped ball valve.

8. The sampling system for measuring the hydrogen sulfide content in coke oven gas according to claim 7, characterized in that: The reflux component further comprises a flow regulating valve, which is arranged on the reflux pipe and located upstream of the reflux valve.

9. A sampling method for determining the content of hydrogen sulfide in coke oven gas, characterized in that: The sampling method is used in the sampling system for measuring the hydrogen sulfide content in coke oven gas as claimed in claim 8, and the sampling method comprises: Open the sampling valve, reflux valve and replacement valve in sequence, start the extraction pump, adjust the flow control valve, control the gas flow in the sampling system at (0.25-1.0) L / min through the flow meter, 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 reflux valve, extraction pump, sampling valve and replacement valve in sequence; After the sampling system completes gas replacement, first open the front valve and the rear valve in sequence, then open the sampling valve and the reflux valve in sequence, start the extraction pump, fine-tune the flow regulating valve, control the gas flow in the sampling system within the preset range, and stop sampling when the amount of hydrogen sulfide absorbed in the collection bottle reaches the preset value. Close the reflux valve, extraction pump and sampling valve in sequence, and close the front valve and the rear valve at the same time. Remove the collection bottle and send it to the laboratory to determine the hydrogen sulfide content.

10. The sampling method for measuring the hydrogen sulfide content in coke oven gas according to claim 9, characterized in that: According to the hydrogen sulfide content in the coal gas to be tested, the gas flow rate of the sampling system during the sampling process and the amount of hydrogen sulfide absorbed by the collecting bottle when the sampling is completed are adjusted; If the hydrogen sulfide content in the gas is (1-30) mg / m 3 When the sampling system is in the process of sampling, the gas flow rate is (0.25-0.5) L / min, and the amount of hydrogen sulfide absorbed by the collection bottle is (0.005-0.03) mg when the sampling is completed; If the hydrogen sulfide content in the gas is 10 mg / m 3 When the above conditions are met, the gas flow rate of the sampling system during the sampling process is (0.5-1.0) L / min, and the amount of hydrogen sulfide absorbed by the collecting bottle when the sampling is completed is (0.85-35) mg.

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