A sulfur determination instrument

Abstract

The present invention discloses a sulfur determination instrument, comprising a heating furnace, an electrolytic cell and a flow meter, wherein two or more main drying boxes are arranged between the electrolytic cell and the flow meter, each main drying box is connected between the electrolytic cell and the flow meter through a drying pipeline control component, so as to make the two or more main drying boxes alternately perform a separate drying operation on the gas input from the electrolytic cell and then directly transmit it to the flow meter; a self-drying mechanism is also provided, which is connected to each main drying box through a ventilation pipeline control component and is used to self-dry the inside of the main drying box where no drying operation is performed. The present invention has the advantages of simple and compact structure, convenient and flexible operation, high degree of automation, greatly reduced labor intensity, greatly improved work efficiency, and effective guarantee of the accuracy of test results.

Description

Technical Field

[0001] The invention mainly relates to the field of material sample collection and analysis equipment, and in particular to a sulfur determination instrument. Background Art

[0002] Each country has mandatory standards for the sampling and analysis of materials (such as ores and coal), and the sampling and analysis must be carried out in accordance with the standards. In addition to some mineral impurities and water, the rest of the combustible material is organic matter. Taking coal analysis as an example, the organic matter in coal is mainly composed of carbon, hydrogen, oxygen, nitrogen, sulfur and other elements. They are one of the indicators of scientific classification of coal, and can also be used to calculate the calorific value of coal, estimate and predict the low-temperature dry distillation products of coal, and are the basic basis for evaluating the quality of combustibles. All measuring instruments for analyzing the element content in combustible materials are collectively called element analyzers.

[0003] Sulfur is the most important harmful component in coal samples, and it mainly exists in coal in the form of elemental sulfur, sulfide and sulfate. After combustion, the sulfide contained in coal will generate harmful SO2 and SO3 gases and fly ash, etc., which are discharged into the atmosphere with flue gas, causing air and environmental pollution. Therefore, the detection of sulfur content in coal samples is a very important task for coal production, sales, use and environmental protection departments. In the prior art, in order to accurately and quickly measure the sulfur content in combustible materials, a sulfur meter is generally used as a common measuring device, and the coulometric sulfur measurement method is used.

[0004] In the coulometric sulfur determination method, after the coal sample is burned in the heating furnace, sulfur dioxide and a small amount of sulfur trioxide gas are generated, which enter the electrolytic cell through the pipeline connected to the inner cavity of the heating furnace for titration. The sulfur content in the sample is determined according to the amount of electricity consumed by the electrogenerated iodine and electrogenerated bromine. During the measurement process, water vapor and mist will be continuously generated due to the high-temperature airflow flowing through the constantly stirred electrolytic cell. Under the pumping force of the pump, they will enter the pipeline with the airflow. A flow sensor (flow meter) for detecting the flow is connected after the electrolytic cell. In order to ensure that the flow sensor can always be in a dry working environment and the airflow passing through it does not contain moisture, a drying device for absorbing water will be connected in series before the airflow enters the flow sensor (the desiccant currently used in the industry is color-changing silica gel). However, in the existing coulometric sulfur determination instrument, the pump adopts a continuous working mode. Whether during the experiment or during the experiment, the pump is always turned on, and water vapor and mist are continuously extracted from the electrolytic cell. Some water vapor is even condensed into water droplets when it is cooled and adsorbed on the wall of the pipeline. After a large amount of water vapor and water droplets enter the drying device, the service life of the desiccant is greatly shortened. The desiccant needs to be replaced almost every day. Otherwise, once the water vapor enters the flow sensor, the flow of the entire instrument will become inaccurate, and the test results will naturally be greatly affected. Therefore, the operator must observe the use of the desiccant with the naked eye at any time and replace it in time. This greatly increases the labor intensity of the operator and may cause gas poisoning when frequently replaced; second, frequent replacement leads to interrupted instrument operation, low work efficiency, and low degree of automation; third, frequent manual replacement causes the instrument to be easily damaged. Fourth, due to the suction of the pump, the water droplets adsorbed on the pipe wall will not flow back, and continue to accumulate, making the cross-sectional area of ​​the pipe smaller and the airflow not smooth, which directly affects the size of the air flow and ultimately leads to inaccurate test results. Summary of the invention

[0005] The technical problem solved by the present invention is: in view of the problems existing in the prior art, a sulfur determination instrument is provided which has a simple and compact structure, is convenient and flexible to operate, has a high degree of automation, greatly reduces labor intensity, greatly improves work efficiency, and effectively ensures the accuracy of test results.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] A sulfur determination instrument comprises a heating furnace, an electrolytic cell and a flow meter, wherein two or more main drying boxes are arranged between the electrolytic cell and the flow meter, each of the main drying boxes is connected between the electrolytic cell and the flow meter through a drying pipeline control component, so that the two or more main drying boxes alternately perform separate drying operations on the gas input from the electrolytic cell and then directly transmit it to the flow meter; a self-drying mechanism is also provided, and the self-drying mechanism is connected to each main drying box through a ventilation pipeline control component, so as to perform self-drying on the inside of the main drying box where no drying operation is performed.

[0008] As a further improvement of the present invention, the drying pipe control assembly includes a first reversing valve and more than two first pipes, the first reversing valve is connected to the gas outlet end of the electrolytic cell through the pipe, the head end of each of the first pipes is respectively connected to the gas inlet end of a main drying box, and the tail end of each of the first pipes is simultaneously connected to the first reversing valve, so as to enable the electrolytic cell to alternately supply gas to different main drying boxes under the control of the first reversing valve.

[0009] As a further improvement of the present invention, the drying pipe control component also includes a second reversing valve and more than two second pipes, the second reversing valve is connected to the air inlet end of the flow meter through the pipe, the head end of each of the second pipes is respectively connected to the air outlet end of a main drying box, and the tail end of each of the second pipes is simultaneously connected to the second reversing valve, so as to connect only the main drying box in drying operation with the flow meter under the control of the second reversing valve.

[0010] As a further improvement of the present invention, the drying pipe control component includes more than two third pipes, and the air inlet end of each of the main drying boxes is connected to the air outlet end of the electrolytic cell through a third pipe. Each of the third pipes is provided with a first valve for alternately supplying air to different main drying boxes through the coordinated control of multiple first valves.

[0011] As a further improvement of the present invention, the drying pipe control component includes more than two fourth pipes, and the air outlet end of each of the main drying boxes is connected to the air inlet end of the flow meter through a fourth pipe. Each of the fourth pipes is provided with a second valve for connecting only the main drying box in drying operation with the flow meter through the coordinated control of multiple second valves.

[0012] As a further improvement of the present invention, the self-drying mechanism includes an air blowing assembly for self-drying the inside of the main drying box, and the ventilation duct control assembly includes a third reversing valve and two or more fifth ducts. The third reversing valve is connected to the air outlet end of the air blowing assembly through a duct, and the head end of each of the fifth ducts is respectively connected to the air inlet end of a main drying box, and the tail end of each of the fifth ducts is simultaneously connected to the third reversing valve, so that under the control of the third reversing valve, the air blowing assembly only blows air into the main drying box where no drying operation is being carried out to dry the desiccant in the main drying box.

[0013] As a further improvement of the present invention, the ventilation duct control component also includes a fourth reversing valve and two or more sixth ducts, the fourth reversing valve is connected to the outside through the duct, the head end of each of the sixth ducts is respectively connected to the air outlet end of a main drying box, and the tail end of each of the sixth ducts is simultaneously connected to the fourth reversing valve, so as to discharge only the air in the main drying box that is self-drying to the outside under the control of the fourth reversing valve.

[0014] As a further improvement of the present invention, the self-drying mechanism includes an air blowing assembly for self-drying the inside of the main drying box, and the ventilation duct control assembly includes more than two seventh ducts. The air inlet end of each of the main drying boxes is connected to the air outlet end of the air blowing assembly through a seventh duct, and each of the seventh ducts is provided with a third valve for controlling the air blowing assembly through the cooperation of multiple third valves to blow air only into the main drying box where no drying operation is being carried out to dry the desiccant in the main drying box.

[0015] As a further improvement of the present invention, the ventilation duct control component also includes more than two eighth ducts, and the air outlet end of each of the main drying boxes is connected to the outside through an eighth duct, and each of the eighth ducts is provided with a fourth valve for controlling through the coordination of multiple fourth valves to discharge only the air in the main drying box that is self-drying to the outside.

[0016] As a further improvement of the present invention, the self-drying mechanism also includes a heater, which is connected between the third reversing valve and the blowing assembly through a pipeline, and is used to heat the gas blown out of the blowing assembly and then pass it into a main drying box where no drying operation is carried out for self-drying.

[0017] As a further improvement of the present invention, the self-drying mechanism also includes more than two heating modules, and a heating module is provided on the outer wall of each main drying box, which is used to heat only the desiccant in the main drying box where no drying operation is carried out and to discharge the gas in the main drying box through a blowing component.

[0018] As a further improvement of the present invention, a secondary drying box is provided on the drying pipe control assembly between the flow meter and more than two main drying boxes, so as to transmit the test gas transmitted from the main drying boxes to the flow meter after drying again in the secondary drying box.

[0019] As a further improvement of the present invention, a humidity detector is also provided on the drying duct control component near the air inlet end of the secondary drying box. When the humidity detector detects that the humidity of the transmitted test gas exceeds a preset value, an alarm is issued to enable more than two main drying boxes to perform alternating drying operations.

[0020] Compared with the prior art, the advantages of the present invention are:

[0021] First, the sulfur determination instrument of the present invention is provided with more than two independent main drying boxes, which can alternately perform separate drying operations on the gas input from the electrolytic cell under the control of the drying pipeline control component; at the same time, a matching self-drying mechanism and a ventilation pipeline control component are provided, so that when the alternating separate drying operations are performed, the main drying box being dried can always enter the operation in a dry state, and the main drying box without drying operation can also be self-dried in time through the self-drying mechanism so as to enter the operation in a dry state next time. This greatly reduces the labor intensity of the operator and avoids the risk of gas poisoning that may occur when manual frequent replacement occurs; second, due to the ability to achieve cyclic drying and self-drying, it is no longer necessary to stop the machine and frequently replace the drying box, thereby making the sulfur determination instrument work without interruption, greatly improving the work efficiency and having a high degree of automation; third, due to the elimination of frequent manual replacement, the instrument is not easily damaged. Fourth, due to the ability to achieve cyclic drying and self-drying, the main drying box being dried can always enter the operation in a dry state, which not only greatly improves the gas drying effect, but also reduces the condensation of water vapor in the pipeline, effectively ensures smooth airflow, and ultimately effectively ensures the accuracy of the test results.

[0022] Second, the sulfur determination instrument of the present invention, multiple main drying boxes, drying pipe control components, self-drying mechanisms, ventilation pipe control components, secondary drying boxes, and humidity detectors cooperate and support each other in terms of function. The humidity detector can detect and start multiple main drying boxes, drying pipe control components, self-drying mechanisms, and ventilation pipe control components to perform alternating drying operations and self-drying, ensuring that most of the test gas is dried. The secondary drying box can perform secondary drying on a small part of the humidity gas that is detected and started by the humidity detector, ultimately ensuring that the drying effect of all gases entering the flow meter is excellent, and ultimately effectively ensuring the accuracy of the test results. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the structural principle of the sulfur determination instrument of the present invention.

[0024] Figure 2 It is a schematic diagram of the structural principle of the sulfur determination instrument of the present invention in specific application embodiment 1.

[0025] Figure 3 It is a schematic diagram of the structural principle of the sulfur determination instrument of the present invention in specific application embodiment 2.

[0026] Figure 4 It is a schematic diagram of the structural principle of the sulfur determination instrument of the present invention in specific application embodiment 5.

[0027] Figure 5 It is a schematic diagram of the structural principle of the sulfur determination instrument of the present invention in specific application embodiment 7.

[0028] Legend:

[0029] 1. Heating furnace; 2. Electrolytic cell; 3. Flow meter; 4. Main drying box; 5. Drying pipe control assembly; 51. First reversing valve; 52. First pipe; 53. Second reversing valve; 54. Second pipe; 55. Third pipe; 56. First valve; 57. Fourth pipe; 58. Second valve; 6. Self-drying mechanism; 61. Blowing assembly; 62. Heater; 63. Heating module; 7. Ventilation pipe control assembly; 71. Third reversing valve; 72. Fifth pipe; 73. Fourth reversing valve; 74. Sixth pipe; 75. Seventh pipe; 76. Third valve; 77. Eighth pipe; 78. Fourth valve; 8. Secondary drying box; 9. Humidity detector. DETAILED DESCRIPTION

[0030] The present invention is further described in detail below in conjunction with specific embodiments and drawings.

[0031] The present invention provides a sulfur determination instrument, such as Figure 1 As shown: it includes a heating furnace 1, an electrolytic cell 2 and a flow meter 3, and more than two main drying boxes 4 are arranged between the electrolytic cell 2 and the flow meter 3, and each main drying box 4 is connected between the electrolytic cell 2 and the flow meter 3 through a drying pipeline control component 5, so that the two or more main drying boxes 4 alternately dry the gas input from the electrolytic cell 2 separately and then directly transmit it to the flow meter 3; a self-drying mechanism 6 is also arranged, and the self-drying mechanism 6 is connected to each main drying box 4 through a ventilation pipeline control component 7, and is used to self-dry the inside of the main drying box 4 where no drying operation is carried out. The specific implementation principle is as follows:

[0032] Assume that there are two main drying boxes 4, A and B, which are both connected between the electrolytic cell 2 and the flow meter 3 through the drying duct control component 5, and the self-drying mechanism 6 is simultaneously connected to the two main drying boxes 4, A and B, through the ventilation duct control component 7. Under the control of the drying duct control component 5, the A main drying box 4 performs a separate drying operation on the gas input from the electrolytic cell 2, and directly transmits the dried gas to the flow meter 3. At this time, the B main drying box 4 does not carry out the drying operation. At this time, under the control of the ventilation duct control component 7, the self-drying mechanism 6 will self-dry the inside of the B main drying box 4 through the ventilation duct control component 7, so that the drying medium inside the B main drying box 4 remains dry.

[0033] After the A main drying box 4 has been in operation for a period of time, the drying capacity of the A main drying box 4 will decrease (because the drying medium inside contains a certain amount of moisture). At this time, under the control of the drying duct control component 5, the A main drying box 4 stops drying the gas input from the electrolytic cell 2, and the dry B main drying box 4 is used to dry the gas input from the electrolytic cell 2, and the dried gas is directly transmitted to the flow meter 3. At the same time, under the control of the ventilation duct control component 7, the self-drying mechanism 6 stops self-drying the inside of the B main drying box 4, and switches to self-drying the inside of the A main drying box 4 that has not been dried, so that the drying medium inside the A main drying box 4 becomes dry.

[0034] After the B main drying box 4 has been operating for a period of time, the drying capacity of the B main drying box 4 will decrease (because the drying medium inside contains a certain amount of moisture). At this time, under the control of the drying pipeline control component 5, the B main drying box 4 stops drying the gas input from the electrolytic cell 2, and the A main drying box 4 that is drying is used to dry the gas input from the electrolytic cell 2, and the dried gas is directly transmitted to the flow meter 3. At the same time, under the control of the ventilation pipeline control component 7, the self-drying mechanism 6 stops self-drying the inside of the A main drying box 4, and switches to self-drying the inside of the B main drying box 4 that has not been drying, so that the drying medium inside the B main drying box 4 becomes dry. In this cycle, when the A and B main drying boxes 4 are alternately performing separate drying operations, the drying main drying box 4 can always enter the operation in a dry state, and the main drying box 4 that has not been drying can also be self-dried in time so as to enter the operation in a dry state next time.

[0035] It should be particularly noted that, regarding the specific structural form of the self-drying mechanism 6, it can be an independent fan mechanism (or hot air blower mechanism), which is connected to the two main drying boxes A and B 4 through the ventilation duct control component 7, and is used to blow air in the main drying box 4 for self-drying. Or in other embodiments, it can also be two independent fan mechanisms (or hot air blower mechanisms), which are connected to the two main drying boxes A and B 4 through the ventilation duct control component 7, that is, each main drying box 4 corresponds to a fan mechanism (or hot air blower mechanism). Or in other embodiments, as described in the specific application embodiment 3 below, the self-drying mechanism 6 can also be not an air blowing component, but an exhaust component, which causes air flow in the self-drying main drying box 4 by exhausting air, thereby achieving drying. Inspired by the above-mentioned disclosed embodiments and technical features, this simple transformation form belongs to the protection scope of the present invention.

[0036] Through the above special scientific design, it has the following technical advantages:

[0037] The sulfur determination instrument of the present invention is provided with more than two independent main drying boxes 4, which can alternately perform a separate drying operation on the gas input from the electrolytic cell 2 under the control of the drying pipeline control component 5; at the same time, a matching self-drying mechanism 6 and a ventilation pipeline control component 7 are provided, so that when the alternating separate drying operation is performed, the main drying box 4 that is drying can always enter the operation in a dry state, and the main drying box 4 that is not drying can also be self-dried in time through the self-drying mechanism 6, so as to enter the operation in a dry state next time. This greatly reduces the labor intensity of the operator and avoids the risk of gas poisoning that may occur when manual frequent replacement; secondly, because it can realize cyclic drying and self-drying, it is no longer necessary to stop the machine and frequently replace the drying box, thereby making the sulfur determination instrument work without interruption, greatly improving the work efficiency and having a high degree of automation; thirdly, because frequent manual replacement is eliminated, the instrument is not easily damaged. Fourthly, because it can realize cyclic drying and self-drying, the main drying box 4 that is drying can always enter the operation in a dry state, which not only greatly improves the gas drying effect, but also reduces the condensation of water vapor in the pipeline, effectively ensures smooth airflow, and finally effectively ensures the accuracy of the test results.

[0038] The present invention further provides several specific application embodiments for illustration:

[0039] Specific application example 1, such as Figure 2 As shown:

[0040] In this embodiment, two main drying boxes 4, A and B, are provided, such as 4 (A) and 4 (B) shown in the figure, and the drying pipe control component 5 includes a first reversing valve 51 and two first pipes 52. The first reversing valve 51 is connected to the gas outlet end of the electrolytic cell 2 through a pipe (the pipe is shown as C in the figure), and the head end of each first pipe 52 is connected to the gas inlet end of a main drying box 4 respectively, and the tail end of each first pipe 52 is simultaneously connected to the first reversing valve 51, so as to enable the electrolytic cell 2 to alternately supply gas to different main drying boxes 4 under the control of the first reversing valve 51. The drying pipe control assembly 5 also includes a second reversing valve 53 and two second pipes 54. The second reversing valve 53 is connected to the air inlet end of the flow meter 3 through a pipe (the pipe is shown as D in the figure). The head end of each second pipe 54 is connected to the air outlet end of a main drying box 4 respectively, and the tail end of each second pipe 54 is simultaneously connected to the second reversing valve 53, so as to connect only the main drying box 4 in the drying operation with the flow meter 3 under the control of the second reversing valve 53.

[0041] The self-drying mechanism 6 includes an air blowing component 61 for self-drying the inside of the main drying box 4. The ventilation pipe control component 7 includes a third reversing valve 71 and two fifth pipes 72. The third reversing valve 71 is connected to the air outlet end of the air blowing component 61 through a pipe (the pipe is shown as E in the figure), and the head end of each fifth pipe 72 is respectively connected to the air inlet end of a main drying box 4, and the tail end of each fifth pipe 72 is simultaneously connected to the third reversing valve 71, so that under the control of the third reversing valve 71, the air blowing component 61 only blows air into the main drying box 4 where no drying operation is carried out to dry the desiccant in the main drying box 4. The ventilation duct control assembly 7 also includes a fourth reversing valve 73 and two sixth ducts 74. The fourth reversing valve 73 is connected to the outside through a duct (the duct is shown as F in the figure). The head end of each sixth duct 74 is connected to the air outlet end of a main drying box 4 respectively, and the tail end of each sixth duct 74 is simultaneously connected to the fourth reversing valve 73, so as to discharge only the air in the main drying box 4 that is being self-dried to the outside under the control of the fourth reversing valve 73.

[0042] The implementation principle is as follows:

[0043] Under the control of the first reversing valve 51, the test gas transmitted from the pipeline C can only enter the A main drying box 4 through the first pipeline 52 on the right side of the figure, and be discharged from the gas outlet after being dried by the A main drying box 4; at this time, under the control of the second reversing valve 53, the dried gas discharged from the A main drying box 4 can only flow directly to the pipeline D through the second pipeline 54 on the right side of the figure, and finally flow to the flow meter 3. At this time, only the A main drying box 4 can perform the drying operation, while the B main drying box 4 is controlled by the first reversing valve 51 and the second reversing valve 53, and no drying operation is carried out.

[0044] However, at the same time, the blowing assembly 61 blows air into the pipe E. Under the control of the third reversing valve 71, the gas transmitted from the pipe E can only enter the B main drying box 4 through the fifth pipe 72 on the left in the figure. The gas entering the B main drying box 4 (the gas can be a normal temperature gas or a hot gas specially heated as described below) will self-dry the inside of the B main drying box 4, so that the drying medium inside the B main drying box 4 becomes dry. The self-dried gas will contain water vapor and be discharged from the gas outlet of the B main drying box 4; at this time, under the control of the fourth reversing valve 73, the gas containing water vapor can only be discharged into the pipe F from the sixth pipe 74 on the left in the figure, and finally discharged to the outside.

[0045] After the A main drying box 4 has been in operation for a period of time, the drying capacity of the A main drying box 4 will decrease. At this time, in order to ensure the best gas drying effect and the accuracy of the test results, under the control of the first reversing valve 51, the test gas transmitted from the pipeline C no longer enters the A main drying box 4, but can only enter the B main drying box 4 through the first pipeline 52 on the left in the figure, and is discharged from the gas outlet after being dried by the B main drying box 4; at this time, under the control of the second reversing valve 53, the dried gas discharged from the B main drying box 4 can only flow directly to the pipeline D through the second pipeline 54 on the left in the figure, and finally flow to the flowmeter 3. At this time, only the B main drying box 4 can perform the drying operation, while the A main drying box 4 is controlled by the first reversing valve 51 and the second reversing valve 53, and no drying operation is carried out (because the drying capacity of the A main drying box 4 has decreased).

[0046] However, at the same time, under the control of the third reversing valve 71, the gas transmitted from the pipeline E no longer enters the B main drying box 4, but can only enter the A main drying box 4 through the fifth pipeline 72 on the right side of the figure, and the gas entering the A main drying box 4 (the gas can be a normal temperature gas or a hot gas specially heated as described below) will self-dry the inside of the A main drying box 4, so that the drying medium inside the A main drying box 4 becomes dry. The self-dried gas will contain water vapor and be discharged from the gas outlet of the A main drying box 4; at this time, under the control of the fourth reversing valve 73, the gas containing water vapor can only be discharged into the pipeline F from the sixth pipeline 74 on the right side of the figure, and finally discharged to the outside.

[0047] After the B main drying box 4 has been in operation for a period of time, the drying capacity of the B main drying box 4 will decrease. At this time, in order to ensure the best gas drying effect and the accuracy of the test results, the A main drying box 4, which is already in a dry state, will be switched to perform the drying operation, and the B main drying box 4 will be self-dried, and this cycle will be repeated. The structural setting of this reversing valve shortens the layout of the pipeline and saves the equipment manufacturing and maintenance costs. At the same time, the reversing is faster and more accurate, resulting in very rapid drying operations and self-drying, which effectively ensures the best gas drying effect and the accuracy of the test results.

[0048] Specific application example 2, such as Figure 3 As shown:

[0049] The present embodiment is different from the specific application embodiment 1 in that a reversing valve is no longer provided, but a plurality of valves are provided, specifically as follows: the drying pipeline control assembly 5 includes two third pipelines 55, the air inlet end of each main drying box 4 is connected to the air outlet end of the electrolytic cell 2 through a third pipeline 55, and each third pipeline 55 is provided with a first valve 56, which is used to control the electrolytic cell 2 to alternately supply air to different main drying boxes 4 through the coordinated control of a plurality of first valves 56. The drying pipeline control assembly 5 also includes two fourth pipelines 57, the air outlet end of each main drying box 4 is connected to the air inlet end of the flow meter 3 through a fourth pipeline 57, and each fourth pipeline 57 is provided with a second valve 58, which is used to control the coordinated control of a plurality of second valves 58 to only connect the main drying box 4 in the drying operation with the flow meter 3.

[0050] In this embodiment, the self-drying mechanism 6 includes a blowing assembly 61 for self-drying the inside of the main drying box 4, and the ventilation duct control assembly 7 includes two seventh ducts 75. The air inlet end of each main drying box 4 is connected to the air outlet end of the blowing assembly 61 through a seventh duct 75. Each seventh duct 75 is provided with a third valve 76, which is used to control the blowing assembly 61 to blow air only into the main drying box 4 where no drying operation is carried out through the cooperation of multiple third valves 76 to dry the desiccant in the main drying box 4. The ventilation duct control assembly 7 also includes two eighth ducts 77. The air outlet end of each main drying box 4 is connected to the outside through an eighth duct 77. Each eighth duct 77 is provided with a fourth valve 78, which is used to control the cooperation of multiple fourth valves 78 to discharge only the air in the main drying box 4 that is being self-dried to the outside.

[0051] That is, in this embodiment, multiple valves cooperate with each other, and the implementation principle is as follows:

[0052] When the A main drying box 4 is to perform drying operation, the first valve 56 on the third pipe 55 connecting the A main drying box 4 and the electrolytic cell 2 is opened, while the first valve 56 on the third pipe 55 connecting the B main drying box 4 and the electrolytic cell 2 is closed. In addition, the second valve 58 on the fourth pipe 57 connecting the A main drying box 4 and the flow meter 3 is opened, while the second valve 58 on the fourth pipe 57 connecting the B main drying box 4 and the flow meter 3 is closed. At this time, only the A main drying box performs drying operation.

[0053] At the same time, the third valve 76 on the seventh pipe 75 connecting the air blowing assembly 61 to the B main drying box 4 is opened, and the fourth valve 78 on the eighth pipe 77 connecting the B main drying box 4 to the outside is also opened. In addition, the third valve 76 on the seventh pipe 75 connecting the air blowing assembly 61 to the A main drying box 4 is closed, and the fourth valve 78 on the eighth pipe 77 connecting the A main drying box 4 to the outside is also closed. This allows the air blowing assembly 61 to only self-dry the inside of the B main drying box 4, and the dried gas containing water vapor is discharged to the outside from the eighth pipe 77.

[0054] After the A main drying box 4 has been in operation for a period of time, the drying capacity of the A main drying box 4 will decrease. At this time, in order to ensure the best gas drying effect and the accuracy of the test results, multiple valves are coordinated to make the electrolytic cell 2 stop supplying gas to the A main drying box 4 and instead supply gas to the B main drying box 4 for drying. At the same time, the air blowing component 61 stops blowing air to the B main drying box 4 for self-drying and instead blows air to the A main drying box 4 for self-drying. This cycle is repeated.

[0055] Specific application example 3:

[0056] The present embodiment is different from the specific application embodiment 1 in that the self-drying mechanism 6 is not an air blowing component but an air exhausting component, which causes air flow in the main drying box 4 of the self-drying device through air exhaust, thereby achieving drying.

[0057] Specific application example 4:

[0058] The present embodiment is different from the specific application embodiment 2 in that the self-drying mechanism 6 is not an air blowing component but an air exhausting component, which causes air flow in the main drying box 4 of the self-drying device through air exhaust, thereby achieving drying.

[0059] Specific application example 5, such as Figure 4 As shown:

[0060] The present embodiment is different from the specific application embodiment 1 in that, based on the specific application embodiment 1, the self-drying mechanism 6 further includes a heater 62, which is connected between the third reversing valve 71 and the air blowing assembly 61 through a pipeline and is used to heat the gas blown out of the air blowing assembly 61 and then pass it into the main drying box 4 where no drying operation is performed for self-drying. This makes the hot air drying more efficient and the drying effect better.

[0061] Specific application example 6:

[0062] This embodiment is different from specific application embodiment 2 in that, based on specific application embodiment 2, the self-drying mechanism 6 also includes a heater 62, and the heater 62 and the blowing component 61 are integrated together, so that the gas blown out from the air outlet of the blowing component 61 is hot air, which makes the hot air drying efficiency higher and the drying effect better.

[0063] Specific application example 7, such as Figure 5 As shown:

[0064] The present embodiment is different from the specific application embodiment 1 in that, on the basis of the specific application embodiment 1, the self-drying mechanism 6 further includes more than two heating modules 63, and a heating module 63 is provided on the outer wall of each main drying box 4, which is used to heat only the desiccant in the main drying box 4 where no drying operation is performed and to discharge the gas in the main drying box 4 through the blowing component 61. When the heating module 63 is heated, the desiccant containing moisture in the main drying box 4 is bound to volatilize water vapor, and then the gas in the main drying box 4 is discharged in time through the cooperation of the blowing component 61, forming an excellent drying effect.

[0065] Inspired by the above disclosed technical features, the present invention further improves that a secondary drying box 8 is provided on the drying duct control assembly 5 between the flow meter 3 and the two or more main drying boxes 4, so as to transmit the test gas transmitted from the main drying box 4 to the flow meter 3 after drying again in the secondary drying box 8. In this embodiment, a humidity detector 9 is provided on the drying duct control assembly 5 near the air inlet end of the secondary drying box 8. When the humidity detector 9 detects that the humidity of the transmitted test gas exceeds a preset value, an alarm is issued to enable the two or more main drying boxes 4 to perform alternate drying operations.

[0066] like Figure 2 , Figure 4 , Figure 5As shown in the example, by setting a humidity detector 9, when a main drying box 4 in drying operation has a low drying level and a poor drying effect, the humidity detector 9 will immediately detect it, and the main drying box 4 with poor drying effect and the main drying box 4 that has been kept dry will be alternately exchanged, and the main drying box 4 with poor drying effect will be immediately self-dried. This ensures the continuity of drying very well, and the drying effect is excellent, which effectively guarantees the accuracy of the test results. By setting a secondary drying box 8, a secondary insurance function is formed. Since the humidity detector 9 needs to detect that the humidity of the gas is too high and an alarm is issued, it means that a part of the gas with high humidity will still pass through the humidity detector 9. By setting a secondary drying box 8 behind the humidity detector 9, this part of the gas with high humidity will still be dried twice before being transmitted to the flow meter 3. That is, the multiple main drying boxes 4, drying duct control components 5, self-drying mechanism 6, ventilation duct control components 7, secondary drying boxes 8, and humidity detectors 9 cooperate and support each other in terms of function. The humidity detector 9 can detect and start the multiple main drying boxes 4, drying duct control components 5, self-drying mechanism 6, and ventilation duct control components 7 to perform alternating drying operations and self-drying, ensuring that most of the test gas is dried. The secondary drying box 8 can also perform secondary drying on a small portion of the humidity gas that is detected and started by the humidity detector 9, ultimately ensuring that the drying effect of all gases entering the flow meter 3 is excellent, and ultimately effectively ensuring the accuracy of the test results.

[0067] The above are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should be regarded as the protection scope of the present invention.

Claims

1. A sulfur determination instrument, comprising a heating furnace (1), an electrolytic cell (2) and a flow meter (3), characterized in that: Two or more main drying boxes (4) are provided between the electrolytic cell (2) and the flow meter (3), and each of the main drying boxes (4) is connected to the electrolytic cell (2) and the flow meter (3) via a drying pipe control component (5), so that the two or more main drying boxes (4) alternately perform a separate drying operation on the gas input from the electrolytic cell (2) and then directly transmit the gas to the flow meter (3); a self-drying mechanism (6) is also provided, and the self-drying mechanism (6) is connected to each main drying box (4) via a ventilation pipe control component (7), and is used to self-dry the interior of the main drying box (4) that is not undergoing a drying operation; the drying pipe control component (5) includes a plurality of reversing valves and a plurality of pipes connected to the main drying box (4). The connecting pipes matched with the reversing valves are used to control the connectivity of the various air paths, or the drying pipe control component (5) includes a plurality of one-way valves and a plurality of connecting pipes matched with the one-way valves to control the connectivity of the various air paths; the self-drying mechanism (6) includes an exhaust component or an air blowing component; the ventilation pipe control component (7) includes a plurality of reversing valves and a plurality of connecting pipes matched with the reversing valves to control the connectivity of the various air paths, or the ventilation pipe control component (7) includes a plurality of one-way valves and a plurality of connecting pipes matched with the one-way valves to control the connectivity of the various air paths; and also includes a pump, which is connected to the air outlet end of the flow meter (3) through a pipe.

2. The sulfur analyzer according to claim 1, characterized in that: The drying pipe control assembly (5) comprises a first reversing valve (51) and two or more first pipes (52), wherein the first reversing valve (51) is connected to the gas outlet of the electrolytic cell (2) through the pipe, the head end of each of the first pipes (52) is connected to the gas inlet end of a corresponding main drying box (4), and the tail end of each of the first pipes (52) is simultaneously connected to the first reversing valve (51), so as to enable the electrolytic cell (2) to alternately supply gas to different main drying boxes (4) under the control of the first reversing valve (51).

3. The sulfur analyzer according to claim 2, characterized in that: The drying pipe control assembly (5) further comprises a second reversing valve (53) and two or more second pipes (54); the second reversing valve (53) is connected to the air inlet of the flow meter (3) via the pipe; the head end of each of the second pipes (54) is connected to the air outlet of a corresponding main drying box (4); the tail end of each of the second pipes (54) is simultaneously connected to the second reversing valve (53) so as to connect only the main drying box (4) in drying operation with the flow meter (3) under the control of the second reversing valve (53).

4. The sulfur analyzer according to claim 1, characterized in that: The drying pipe control assembly (5) comprises more than two third pipes (55), the air inlet end of each main drying box (4) is connected to the air outlet end of the electrolytic cell (2) via a third pipe (55), and each third pipe (55) is provided with a first valve (56) for controlling the electrolytic cell (2) to alternately supply air to different main drying boxes (4) through the coordinated control of the plurality of first valves (56).

5. The sulfur analyzer according to claim 4, characterized in that: The drying pipe control assembly (5) comprises more than two fourth pipes (57), the air outlet of each main drying box (4) is connected to the air inlet of the flow meter (3) via a fourth pipe (57), and each fourth pipe (57) is provided with a second valve (58) for controlling the coordination of the plurality of second valves (58) so that only the main drying box (4) in drying operation is connected to the flow meter (3).

6. The sulfur analyzer according to claim 1, characterized in that: The self-drying mechanism (6) comprises an air blowing assembly (61) for self-drying the interior of the main drying box (4); the ventilation duct control assembly (7) comprises a third reversing valve (71) and two or more fifth ducts (72); the third reversing valve (71) is connected to an air outlet of the air blowing assembly (61) through a duct; the head end of each of the fifth ducts (72) is respectively connected to an air inlet end of a main drying box (4); the tail end of each of the fifth ducts (72) is simultaneously connected to the third reversing valve (71) so as to enable the air blowing assembly (61) to blow air only into the main drying box (4) where no drying operation is being carried out, so as to dry the desiccant in the main drying box (4).

7. The sulfur analyzer according to claim 6, characterized in that: The ventilation duct control assembly (7) further comprises a fourth reversing valve (73) and two or more sixth ducts (74); the fourth reversing valve (73) is connected to the outside through the ducts; the head end of each of the sixth ducts (74) is connected to the air outlet end of a corresponding main drying box (4); the tail end of each of the sixth ducts (74) is simultaneously connected to the fourth reversing valve (73) so as to allow only the air in the main drying box (4) being self-dried to be discharged to the outside under the control of the fourth reversing valve (73).

8. The sulfur analyzer according to claim 1, characterized in that: The self-drying mechanism (6) comprises an air blowing assembly (61) for self-drying the interior of the main drying box (4); the ventilation duct control assembly (7) comprises two or more seventh ducts (75); the air inlet end of each main drying box (4) is connected to the air outlet end of the air blowing assembly (61) via a seventh duct (75); each of the seventh ducts (75) is provided with a third valve (76) for controlling the air blowing assembly (61) to blow air only into the main drying box (4) where no drying operation is being carried out, so as to dry the desiccant in the main drying box (4).

9. The sulfur analyzer according to claim 8, characterized in that: The ventilation duct control assembly (7) further comprises two or more eighth ducts (77), the air outlet end of each main drying box (4) being connected to the outside through an eighth duct (77), and each of the eighth ducts (77) is provided with a fourth valve (78) for controlling the coordinated operation of the plurality of fourth valves (78) to discharge only the air in the main drying box (4) being self-dried to the outside.

10. The sulfur analyzer according to any one of claims 6 or 7, characterized in that: The self-drying mechanism (6) further comprises a heater (62), the heater (62) being connected between the third reversing valve (71) and the air blowing assembly (61) through a pipeline, and being used for heating the gas blown out of the air blowing assembly (61) and then passing the gas into a main drying box (4) where no drying operation is being carried out, so as to perform self-drying.

11. The sulfur analyzer according to any one of claims 8 or 9, characterized in that: The self-drying mechanism (6) further comprises two or more heating modules (63), each of the main drying boxes (4) being provided with a heating module (63) on the outer wall thereof, for heating only the desiccant in the main drying box (4) where no drying operation is being carried out, and for exhausting the gas in the main drying box (4) through the blowing assembly (61).

12. The sulfur analyzer according to any one of claims 1 to 9, characterized in that: A secondary drying box (8) is also provided on the drying pipeline control component (5) between the flow meter (3) and the two or more main drying boxes (4) for re-drying the test gas transmitted from the main drying box (4) through the secondary drying box (8) and then transmitting it to the flow meter (3).

13. The sulfur analyzer according to claim 12, characterized in that: A humidity detector (9) is also provided on the drying duct control component (5) near the air inlet end of the secondary drying box (8). When the humidity detector (9) detects that the humidity of the transmitted test gas exceeds a preset value, an alarm is triggered, so that the two or more main drying boxes (4) perform drying operations alternately.

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