Standard gas calibration device

Abstract

The invention discloses a standard gas calibration device which comprises a plurality of standard gas cylinders, branch pipes and calibration pipes, any two standard gas cylinders are different in measuring range, each standard gas cylinder is provided with a first switch valve, the branch pipes are in one-to-one correspondence with the standard gas cylinders, the first ends of the branch pipes are communicated with the corresponding standard gas cylinders, and the second ends of the branch pipes are communicated with the calibration pipes. The first end of the calibration pipe is communicated with the second ends of all the branch pipes, the second end of the calibration pipe is used for being communicated with a flue gas analyzer, and a pressure reducing valve is installed on the calibration pipe. The standard gas calibration device has the advantages of high calibration efficiency on the flue gas analyzer and low calibration cost.

Description

Technical Field

[0001] The present invention relates to the technical field of calibration equipment, and in particular to a calibration gas calibration device. Background Art

[0002] The Continuous Emission Monitoring System (CEMS) is a flue gas detection device installed in many power plants that emit pollutants. To ensure accurate CEMS measurements, the flue gas analyzer in the CEMS is generally calibrated regularly using standard gas cylinders with standard components. One calibration requires 4-5 bottles of standard gas cylinders to calibrate the different concentrations of a certain component. Calibration of the flue gas analyzer is a regular task, generally once every two weeks. Standard gas cylinders are usually scattered in the CEMS room. A standard gas cylinder weighs about 15kg and is slender and not easy to move. A CEMS room is usually equipped with only one pressure reducing valve. When calibrating the flue gas analyzer, the pressure reducing valve needs to be frequently disassembled to connect the flue gas analyzer to different standard gas cylinders through it, resulting in low calibration efficiency. Summary of the Invention

[0003] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0004] To this end, an embodiment of the present invention provides a calibration device for a standard gas, which has the advantages of high calibration efficiency and low calibration cost for a flue gas analyzer.

[0005] The calibration device of the calibration gas of the embodiment of the present invention includes a calibration gas cylinder, a branch pipe and a calibration tube. There are multiple calibration gas cylinders, and the measuring ranges of any two calibration gas cylinders are different. Each calibration gas cylinder is equipped with a first switch valve; the branch pipes correspond to the calibration gas cylinders one-to-one, and the first ends of the branch pipes are connected to the corresponding calibration gas cylinders; the first ends of the calibration tubes are connected to the second ends of all the branch pipes, and the second ends of the calibration tubes are used to connect to the flue gas analyzer. The calibration tubes are equipped with a pressure reducing valve.

[0006] According to the calibration device of the standard gas of the embodiment of the present invention, by setting up multiple branch pipes all connected to the calibration pipe, it is only necessary to open the first switch valve on any standard gas cylinder and close the first switch valves on the other standard gas cylinders, so that the standard gas in the corresponding standard gas cylinder can be passed into the calibration pipe through the corresponding branch pipe, and then transported to the flue gas analyzer through the calibration pipe to achieve calibration of the standard gas in the standard gas cylinder. Among them, only one pressure reducing valve needs to be set and set on the calibration pipe, so that the outlet pressure of the calibration pipe can always be kept consistent to ensure the accuracy of the standard gas detection, and the pressure reducing valve does not need to be disassembled to ensure that the flue gas analyzer can achieve calibration of the standard gas in each standard gas cylinder. The calibration efficiency of the flue gas analyzer is high and the calibration cost is low.

[0007] In some embodiments, the number of the calibration gas cylinders is four and includes a first calibration gas cylinder of zero gas, a second calibration gas cylinder of low-range calibration gas, a third calibration gas cylinder of mid-range calibration gas, and a fourth calibration gas cylinder of high-range calibration gas.

[0008] In some embodiments, the calibration gas calibration device further includes a five-way valve, and the five interfaces of the five-way valve are respectively connected to the first end of the calibration tube and the first ends of the four branch tubes.

[0009] In some embodiments, the five-way valve comprises an electronic five-way valve.

[0010] In some embodiments, the calibration gas calibration device further includes a one-way valve or a stop valve, which corresponds one-to-one to the branch pipe and is installed at the second end of the corresponding branch pipe.

[0011] In some embodiments, the calibration gas calibration device also includes a three-way valve, an exhaust pipe and a second switch valve, the first interface of the three-way valve is connected to the second end of the calibration pipe, the second interface of the three-way valve is used to connect with the flue gas analyzer, the third interface of the three-way valve is connected to the first end of the exhaust pipe, and the second switch valve is installed on the exhaust pipe.

[0012] In some embodiments, the calibration gas device further includes a rack, the rack is provided with positioning grooves, the positioning grooves correspond one-to-one to the calibration gas bottles, and the calibration gas bottles are arranged in the positioning grooves.

[0013] In some embodiments, running wheels are installed at the bottom of the rack.

[0014] In some embodiments, the plurality of calibration gas cylinders are placed upright, the plurality of calibration gas cylinders are arranged at intervals along a straight line direction, or the plurality of calibration gas cylinders are arranged at intervals along a circumferential direction.

[0015] In some embodiments, the branch pipe and the calibration pipe are both hoses, and the branch pipe and the calibration pipe have the same size and shape. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 2 is a schematic diagram of a calibration gas device according to an embodiment of the present invention.

[0017] Figure 2 FIG. 4 is a schematic diagram of a storage rack in a calibration gas calibration device according to an embodiment of the present invention.

[0018] Reference numerals:

[0019] 1. First calibration gas cylinder; 11. First on-off valve; 2. Second calibration gas cylinder; 3. Third calibration gas cylinder; 4. Fourth calibration gas cylinder; 5. Branch pipe; 6. Calibration pipe; 7. Five-way valve; 8. One-way valve; 9. Storage rack; 91. Positioning slot; 10. Pressure reducing valve. DETAILED DESCRIPTION

[0020] The 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.

[0021] The following combination Figure 1 and Figure 2 A calibration device for calibration with calibration gas according to an embodiment of the present invention is described.

[0022] The calibration device for calibration gas according to an embodiment of the present invention includes multiple calibration gas cylinders, branch pipes 5, and calibration tubes 6. There are multiple calibration gas cylinders, and any two of these cylinders have different measuring ranges. Each calibration gas cylinder is equipped with a first on / off valve 11. Each branch pipe 5 corresponds to a calibration gas cylinder, and the first end of each branch pipe 5 is connected to the corresponding calibration gas cylinder. The first end of each calibration tube 6 is connected to the second end of all branch pipes 5, and the second end of each calibration tube 6 is used to connect to the flue gas analyzer. A pressure reducing valve 10 is installed on each calibration tube 6.

[0023] According to the calibration device for calibration of the standard gas of the embodiment of the present invention, a plurality of branch pipes 5 are connected to the calibration tube 6. By opening the first switch valve 11 on any standard gas cylinder and closing the first switch valves 11 on the remaining standard gas cylinders, the standard gas in the corresponding standard gas cylinder can be passed into the calibration tube 6 through the corresponding branch pipe 5, and then transported to the flue gas analyzer through the calibration tube 6 to achieve calibration of the standard gas in the standard gas cylinder. Among them, only one pressure reducing valve 10 needs to be set and set on the calibration tube 6, so that the outlet pressure of the calibration tube 6 can always be kept consistent to ensure the accuracy of the standard gas detection, and the pressure reducing valve 10 does not need to be disassembled to ensure that the flue gas analyzer can achieve calibration of the standard gas in each standard gas cylinder. The calibration efficiency of the flue gas analyzer is high and the calibration cost is low.

[0024] It should be noted that the first switch valve 11 is integrated on the calibration gas cylinder. When the calibration gas in the calibration gas cylinder needs to be calibrated, it is only necessary to manually open the corresponding first switch valve 11 and close the remaining first switch valves 11.

[0025] In some embodiments, as Figure 1 As shown, there are four standard gas cylinders, including a first standard gas cylinder 1 for zero gas, a second standard gas cylinder 2 for low-range standard gas, a third standard gas cylinder 3 for mid-range standard gas, and a fourth standard gas cylinder 4 for high-range standard gas.

[0026] The flue gas analyzer can complete the calibration of the flue gas analyzer by calibrating the standard gases in the first standard gas cylinder 1, the second standard gas cylinder 2, the third standard gas cylinder 3 and the fourth standard gas cylinder 4 respectively. At this time, the number of branch pipes 5 is also arranged less, the structure of the standard gas calibration device is simpler, and the cost is lower.

[0027] For example, the first to fourth standard gas cylinders 1 to 4 have the same size and shape, wherein the outer surface of each of the first to fourth standard gas cylinders 1 to 4 can be printed or pasted with a mark representing its range, so as to make it easier for the flue gas analyzer to calibrate the standard gas therein.

[0028] It should be noted that the number of standard gas cylinders may also be five.

[0029] In some embodiments, as Figure 1 As shown, the calibration gas calibration device further includes a five-way valve 7 , and five interfaces of the five-way valve 7 are respectively connected to the first end of the calibration pipe 6 and the first ends of the four branch pipes 5 .

[0030] The five-way valve 7 is provided to facilitate the parallel connection of the four branch pipes 5 and the series connection with the calibration pipe 6. The calibration gas calibration device has a simple structure and is easy and reliable to assemble.

[0031] For example, the second end of the branch pipe 5 and the first end of the calibration pipe 6 are both provided with a first quick connector, and the five interfaces of the five-way valve 7 are all provided with a second quick connector. The branch pipe 5 and the calibration pipe 6 are both connected to the five-way valve 7 through the docking of the first quick connector and the second quick connector.

[0032] In some embodiments, the five-way valve 7 includes an electronic five-way valve 7 .

[0033] At this time, after the flue gas analyzer is connected to the calibration tube 6, all the first switch valves 11 can be opened at one time, and then the on and off of the corresponding interfaces in the electronic five-way valve 7 can be controlled to realize the calibration of the flue gas analyzer to the standard gas in different standard gas bottles, so that the calibration efficiency of the flue gas analyzer is higher.

[0034] In some embodiments, the calibration gas calibration device further includes a one-way valve 8 or a stop valve, which corresponds one-to-one to the branch pipe 5 and is installed at the second end of the corresponding branch pipe 5 .

[0035] By installing a one-way valve 8 and a stop valve at the second end of the branch pipe 5, the standard gas in the standard gas bottle is effectively prevented from entering other branch pipes 5 or even filling other standard gas bottles when it is transported to the calibration tube 6 through the corresponding branch pipe 5, thereby effectively ensuring the accuracy of the component content of the standard gas in each standard gas bottle.

[0036] For example, Figure 1 As shown, a one-way valve 8 is provided at the second end of each branch pipe 5 .

[0037] In some embodiments, the calibration gas calibration device also includes a three-way valve, an exhaust pipe and a second switch valve, the first interface of the three-way valve is connected to the second end of the calibration tube 6, the second interface of the three-way valve is used to connect with the flue gas analyzer, the third interface of the three-way valve is connected to the first end of the exhaust pipe, and the second switch valve is installed on the exhaust pipe.

[0038] After the calibration of the standard gas in the calibration gas cylinder is completed, the second on-off valve is closed. When calibrating the standard gas in the next calibration gas cylinder, the second on-off valve is first opened to ensure that the standard gas from the previous calibration gas cylinder remaining in the calibration tube 6 is completely discharged to the outside when the next calibration gas cylinder is supplied. The second on-off valve is then closed, allowing the flue gas analyzer to calibrate the standard gas in the calibration gas cylinder, thereby achieving high calibration reliability.

[0039] In some embodiments, the calibration gas device further includes a rack 9 , which is provided with positioning grooves 91 . The positioning grooves 91 correspond one-to-one to the calibration gas bottles, and the calibration gas bottles are arranged in the positioning grooves 91 .

[0040] The positioning slots 91 on the rack 9 ensure that all calibration gas cylinders are fixed in their corresponding slots 91, preventing cylindrical calibration gas cylinders from rolling around in the CEMS room and affecting the connection reliability between the calibration gas cylinders, branch pipes 5, and calibration pipes 6. This also ensures that the calibration gas cylinders are arranged in a fixed position, preventing duplicate calibration or missing calibration gases in the calibration gas cylinders.

[0041] For example, Figure 2 As shown, the positioning groove 91 is a circular groove, and the bottom of the calibration gas cylinder is inserted into the positioning groove 91 .

[0042] In some embodiments, running wheels are installed at the bottom of the rack 9.

[0043] Therefore, the gas replenishment operation of the standard gas cylinder can be achieved without frequently moving the standard gas cylinder, and the movement of the standard gas cylinder saves time and effort.

[0044] In some embodiments, the plurality of calibration gas cylinders are placed upright, and the plurality of calibration gas cylinders are arranged at intervals along a straight line direction, or the plurality of calibration gas cylinders are arranged at intervals along a circumferential direction.

[0045] By placing the calibration gas cylinders upright, the liquid inside can be prevented from accidentally entering the branch pipe 5 through the first on-off valve 11, causing blockage or measurement errors. By arranging multiple calibration gas cylinders in a straight line, the rack 9 above them is kept narrow, making it easier for the rack 9 to enter and exit the CEMS room for gas replenishment. Alternatively, by arranging the calibration gas cylinders in circumferential spacing, the space occupied by all calibration gas cylinders can be reduced, and the spacing between them can be shortened, making it easier to adjust the on / off operation of the first on-off valve 11 above them.

[0046] For example, Figure 2As shown, four standard gas cylinders are arranged at intervals along the circumference.

[0047] In some embodiments, the branch pipe 5 and the calibration pipe 6 are both flexible pipes, and the branch pipe 5 and the calibration pipe 6 have the same size and shape.

[0048] By configuring both branch pipe 5 and calibration pipe 6 as flexible pipes, the assembly efficiency of the calibration gas calibration device and the efficiency of its connection to the flue gas analyzer are effectively improved. By configuring branch pipe 5 and calibration pipe 6 to be the same size and shape, the number of parts in the calibration gas calibration device is reduced, thereby lowering procurement costs.

[0049] In the description of the present invention, it should 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" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0050] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0051] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0052] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0053] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" 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 expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0054] Although the above embodiments have been shown and described, it is understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. Changes, modifications, substitutions and variations of the above embodiments by those skilled in the art are all within the scope of protection of the present invention.

Claims

1. A calibration gas calibration device, characterized in that: include: There are multiple standard gas cylinders, and the measuring ranges of any two of the standard gas cylinders are different. Each of the standard gas cylinders is equipped with a first switch valve; A branch pipe, each of the branch pipes corresponds to the standard gas cylinder on a one-to-one basis, and a first end of the branch pipe is connected to the corresponding standard gas cylinder; A calibration tube, wherein the first end of the calibration tube is connected to the second ends of all the branch tubes, the second end of the calibration tube is used to be connected to the flue gas analyzer, and a pressure reducing valve is installed on the calibration tube.

2. The calibration gas calibration device according to claim 1, characterized in that: There are four standard gas cylinders, including a first standard gas cylinder for zero gas, a second standard gas cylinder for low-range standard gas, a third standard gas cylinder for mid-range standard gas, and a fourth standard gas cylinder for high-range standard gas.

3. The calibration gas calibration device according to claim 2, characterized in that: The calibration gas calibration device further comprises a five-way valve, the five interfaces of which are respectively connected to the first end of the calibration tube and the first ends of the four branch tubes.

4. The calibration gas calibration device according to claim 3, characterized in that: The five-way valve includes an electronic five-way valve.

5. The calibration gas calibration device according to claim 1, characterized in that: The calibration gas calibration device further includes a one-way valve or a stop valve, which corresponds to the branch pipes one-to-one and is installed at the second end of the corresponding branch pipe.

6. The calibration gas calibration device according to claim 1, characterized in that: The calibration gas calibration device also includes a three-way valve, an exhaust pipe and a second switch valve. The first interface of the three-way valve is connected to the second end of the calibration pipe, the second interface of the three-way valve is used to connect to the flue gas analyzer, the third interface of the three-way valve is connected to the first end of the exhaust pipe, and the second switch valve is installed on the exhaust pipe.

7. The calibration gas calibration device according to claim 1, characterized in that: The calibration gas calibration device further comprises a storage rack, the storage rack is provided with a positioning groove, the positioning groove corresponds to the calibration gas cylinder one-to-one, and the calibration gas cylinder is arranged in the positioning groove.

8. The calibration gas calibration device according to claim 7, characterized in that: Travel wheels are installed at the bottom of the rack.

9. The calibration gas calibration device according to any one of claims 1 to 8, characterized in that: The plurality of calibration gas cylinders are placed upright, and the plurality of calibration gas cylinders are arranged at intervals along a straight line direction, or the plurality of calibration gas cylinders are arranged at intervals along a circumferential direction.

10. The calibration gas calibration device according to claim 1, characterized in that: The branch pipe and the calibration pipe are both flexible pipes, and the branch pipe and the calibration pipe are the same in size and shape.

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