A hydrogen-doped natural gas pipeline regulation test device

Abstract

The present invention is applicable to the field of gas testing, and provides a hydrogen-doped natural gas pipeline regulation testing device, which includes a gas mixing kettle. A sealing mechanism is arranged between the gas mixing kettle and the end cover. At the front end, a natural gas inlet is arranged on the end cover, and a natural gas injection device is arranged at the inner end of the natural gas inlet. At the rear end, a gas mixing outlet is arranged on the end cover, and an air flow testing mechanism is arranged inside the gas mixing outlet. When the present invention is in use, natural gas is input into the interior of the gas mixing kettle from the natural gas inlet, and then hydrogen is input into the interior of the gas mixing kettle from the hydrogen inlet above. The natural gas is ejected under high pressure through the natural gas silencing nozzle. While the natural gas is under high pressure, its temperature will be increased. Hydrogen is ejected downward from the hydrogen silencing nozzle. The jet directions of the natural gas and hydrogen are perpendicular to each other. Then, after the natural gas and hydrogen collide, they are initially mixed. When the mixed gas enters the middle position of the gas mixing kettle, two gas mixing rotors rotate in opposite directions for secondary full mixing.

Description

Technical Field

[0001] The present invention belongs to the field of gas testing, and particularly relates to a device for regulating and testing a hydrogen-doped natural gas pipeline. Background Art

[0002] With the development of industrial technology, modern gas testing technology has become increasingly perfect. In the range of combustible gases, hydrogen has a relatively high calorific value. Mixing hydrogen and natural gas together can form a more burn-resistant mixed gas. The gas mixing equipment is the core component in the gas hydrogen-doping mixing device. Its main task is to uniformly mix natural gas and hydrogen in a predetermined ratio to form hydrogen-doped natural gas. This mixed gas not only has a higher calorific value but also can achieve cleaner combustion, so it is widely used in various gas equipment.

[0003] However, this device still has defects in use. Firstly, the mixing and agitation of the device are not thorough enough, so the two gases are unevenly mixed during the mixing process, which leads to inconsistent densities of each part in the mixed gas, and the formed flame will be of varying sizes. Secondly, in order to better mix the gases, the device pre-heats the mixed gas, but after the natural gas and hydrogen are heated, they will have an expansion effect. After the volume of the natural gas and hydrogen mixed gas changes, it will affect the subsequent flow rate detection and density detection. Summary of the Invention

[0004] The purpose of the present invention is to provide a device for regulating and testing a hydrogen-doped natural gas pipeline in view of the deficiencies of the prior art. When this device is in use, the natural gas to be processed is input into the inside of the gas mixing kettle from the natural gas inlet, and then hydrogen is input into the inside of the gas mixing kettle from the upper hydrogen inlet. The natural gas is ejected under high pressure through the natural gas silencing nozzle. While bearing high pressure, the natural gas will be heated, so the molecules of the natural gas after entering the inside of the gas mixing kettle will be more active. The hydrogen is ejected downward from the hydrogen silencing nozzle, and the jet directions of the natural gas and hydrogen are perpendicular to each other. Then, after the natural gas and hydrogen collide, they are initially fused. When the mixed gas enters the middle position of the gas mixing kettle, at this time, the two gas mixing rotors rotate in opposite directions for secondary mixing, achieving an efficient mixing effect, so as to solve the problems mentioned in the background art.

[0005] To solve the above problems, the present invention provides the following technical solutions: A hydrogen-doped natural gas pipeline regulation and testing device, including a gas mixing kettle. A fixing device is arranged at the bottom of the gas mixing kettle. End caps are arranged at both ends of the gas mixing kettle. A sealing mechanism is arranged between the gas mixing kettle and the end caps. A natural gas inlet is arranged on the front end cap. A natural gas injection device is arranged at the inner end of the natural gas inlet. A mixed gas outlet is arranged on the rear end cap. An air flow testing mechanism is arranged inside the mixed gas outlet. A hydrogen inlet and a pressure relief port are arranged at the top of the gas mixing kettle. A hydrogen injection device is arranged at the inner end of the hydrogen inlet. A gas mixing component is arranged on the front side inside the gas mixing kettle. A gas mixing and cooling mechanism is arranged on the rear side inside the gas mixing kettle. The natural gas injection device includes a natural gas pressurizing box at the inner end of the natural gas inlet. Three natural gas silencing nozzles are arranged on the side wall of the natural gas pressurizing box facing away from the natural gas inlet. An air resistance tongue is arranged at the air outlet of the natural gas silencing nozzle. The gas mixing and cooling mechanism includes a support frame on the side wall of the gas mixing kettle. A spiral fan is arranged on one side of the support frame. A horizontal shaft is arranged on the axis of the fan blades of the spiral fan. A vertical bevel gear is arranged at the end of the horizontal shaft. Horizontal bevel gears are arranged on both the upper and lower sides of the vertical bevel gear. The two horizontal bevel gears are respectively meshed with the vertical bevel gear. The two horizontal bevel gears are respectively fixed at the ends of two vertical shafts. An extension pipe is arranged outside the spiral fan. Cooling coils are fixedly arranged at both ends of the extension pipe. The cooling coils pass through the side wall of the gas mixing kettle and extend above the gas mixing kettle. A liquid nitrogen joint is arranged at the port of the cooling coil. The liquid nitrogen joint is connected to circulating liquid nitrogen.

[0006] Further, the fixing device includes two bases. The bases are fixedly connected to the concrete floor through expansion screws. A layer of rubber pad is laid in the arc-shaped groove at the top of the base.

[0007] Further, the sealing mechanism includes an annular groove at the edge of the end cap port. Arc-shaped strips are arranged at the front and rear port edges of the gas mixing kettle and are inserted into the annular groove. The outer side walls of the gas mixing kettle and the end caps are fixedly connected through an annular array of bolt assembly blocks.

[0008] Further, the hydrogen injection device includes a hydrogen pressurizing box at the inner end of the hydrogen inlet. Two hydrogen silencing nozzles are arranged at the bottom of the hydrogen pressurizing box. The injection directions of the natural gas silencing nozzle and the hydrogen silencing nozzle are perpendicular to each other.

[0009] Further, the air flow testing mechanism includes a cylindrical plug block inside the mixed gas outlet. A number of annularly arranged pinhole air channels are arranged on the plug block. Gas detectors are arranged in the pinhole air channels.

[0010] Further, the gas mixing component includes two vertical shafts rotatably arranged on the inner side wall of the gas mixing kettle. Gas mixing wheels are arranged on the vertical shafts. The two gas mixing wheels rotate in opposite directions.

[0011] Compared with the prior art, the embodiments of the present application mainly have the following beneficial effects:

[0012] First, when the device is in use, the natural gas to be processed is input into the mixing kettle from the natural gas inlet, and then hydrogen is input into the mixing kettle from the upper hydrogen inlet. The natural gas is ejected from the natural gas silencing nozzle under high pressure. While the natural gas is under high pressure, its temperature will be increased. Therefore, the molecules of the natural gas will be more active after entering the mixing kettle. Hydrogen is ejected downward from the hydrogen silencing nozzle, and the jet directions of the natural gas and hydrogen are perpendicular to each other. Then, after the natural gas and hydrogen collide, they are initially fused. When the mixed gas enters the middle position of the mixing kettle, the two mixing rotors rotate in opposite directions for secondary mixing, achieving the effect of efficient mixing.

[0013] Second, during the rotation of the fan, the mixed gas is agitated to rotate in the mixing kettle to form a vortex. Then, the rotating turbine will pass through the cooling coil. The two liquid nitrogen connectors are docked to the circulating liquid nitrogen pump. After liquid nitrogen is introduced into the cooling coil, an extremely low temperature will be formed. The vortex mixed gas will quickly transfer heat to the liquid nitrogen and take it out. Then, when it is discharged from the mixing outlet, it will reach the normal temperature state. The density of the mixed gas in the normal temperature state will stabilize. During the operation of the spiral fan, the horizontal axis of the spiral fan axis will rotate synchronously. The vertical bevel gear at the end of the horizontal axis drives the rotation of the two vertical axes through two horizontal bevel gears at the same time. Then, the two mixing rotors will rotate in opposite directions along with the vertical axes.

[0014] Third, the cooled mixed gas passes through the pinhole air ducts on the blocking block. The blocking block can not only prevent air from leaking out of the mixing outlet instantaneously, but also the gas detector in the pinhole air ducts will detect the proportion of natural gas components in each pinhole air duct. The deviation of the proportion of natural gas components in each pinhole air duct can be used as a reference for the air uniformity. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a front view schematic diagram of the present invention.

[0016] Figure 2 It is a sectional view schematic diagram of the present invention.

[0017] Figure 3 It is a schematic diagram of the natural gas inlet of the present invention.

[0018] Figure 4 It is a schematic diagram of the hydrogen inlet of the present invention.

[0019] Figure 5 It is a schematic diagram of the cooling coil of the present invention.

[0020] Figure 6Schematic diagram of the spiral fan of the present invention.

[0021] Figure 7 Schematic diagram of the extension pipe of the present invention.

[0022] Explanation of reference numerals:

[0023] Gas mixing kettle 1, base 101, end cover 102, bolt assembly block 103, natural gas inlet 2, natural gas pressurizing box 201, natural gas silencing nozzle 202, gas mixing outlet 3, hydrogen inlet 4, hydrogen pressurizing box 401, hydrogen silencing nozzle 402, pressure relief port 5, cooling coil 6, extension pipe 601, liquid nitrogen joint 602, support frame 7, spiral fan 701, horizontal axis 8, vertical bevel gear 801, gas mixing runner 802. Detailed implementation manners

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this application belongs; the terms used in the description of this application in the specification are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above drawings are intended to cover non-exclusive inclusion. The terms "first", "second", etc. in the specification and claims of this application or the above drawings are used to distinguish different objects and not to describe a specific order.

[0025] Reference to "embodiment" herein means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of this application. The phrase does not necessarily refer to the same embodiment at various places in the specification, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0026] The present invention provides a hydrogen-doped natural gas pipeline regulation and testing device, as Figures 1-7 shown, including a gas mixing kettle 1, a fixing device is provided at the bottom of the gas mixing kettle 1, end covers 102 are provided at both ends of the gas mixing kettle 1, and a sealing mechanism is provided between the gas mixing kettle 1 and the end covers 102; a natural gas inlet 2 is provided on the front end cover 102, a natural gas injection device is provided at the inner end of the natural gas inlet 2, a gas mixing outlet 3 is provided on the rear end cover 102, an air flow testing mechanism is provided inside the gas mixing outlet 3, a hydrogen inlet 4 and a pressure relief port 5 are provided at the top of the gas mixing kettle 1, and a hydrogen injection device is provided at the inner end of the hydrogen inlet 4; a gas mixing component is provided on the front side inside the gas mixing kettle 1, and a gas mixing and cooling mechanism is provided on the rear side inside the gas mixing kettle 1.

[0027] In this embodiment, the natural gas to be processed is input into the inside of the gas mixing kettle 1 from the natural gas inlet 2, and then hydrogen is input into the inside of the gas mixing kettle 1 from the upper hydrogen inlet 4. While under high pressure, the temperature of the natural gas will be increased. Therefore, the molecules of the natural gas after being introduced into the inside of the gas mixing kettle 1 will be more active. The input jet directions of the natural gas and hydrogen are perpendicular to each other. Then, after the natural gas and hydrogen collide, they will be initially fused. Compared with the prior art natural gas preheating method, the previous natural gas would be heated by a water bath method. However, the water bath heating would incorporate steam water molecules into the natural gas, which would affect the subsequent testing work. The present invention directly heats the natural gas under high pressure without incorporating impurities.

[0028] In a further embodiment of the present invention, as Figures 1-4 shown, the natural gas injection device includes a natural gas pressurizing box 201 at the inner end of the natural gas inlet 2. Three natural gas silencing nozzles 202 are provided on the side wall of the natural gas pressurizing box 201 facing away from the natural gas inlet 2. An air resistance tongue is provided at the air outlet of the natural gas silencing nozzle 202.

[0029] In this embodiment, the air resistance tongue can provide a corresponding pressure resistance to the air outlet of the natural gas silencing nozzle 202. Then, when the external weather heat input pump injects hydrogen, a high pressure can be formed inside the natural gas pressurizing box 201. The high-pressure natural gas can raise the temperature. The internal energy of the natural gas comes from the natural gas pump. Therefore, the molecules of the natural gas after being introduced into the inside of the gas mixing kettle 1 will be more active.

[0030] In a further embodiment of the present invention, as Figures 5-7 shown, the gas mixing and cooling mechanism includes a support frame 7 on the side wall of the gas mixing kettle 1. A spiral fan 701 is provided on one side of the support frame 7. A horizontal shaft 8 is provided on the axis of the fan blades of the spiral fan 701. A vertical bevel gear 801 is provided at the end of the horizontal shaft 8. Horizontal bevel gears are provided on both the upper and lower sides of the vertical bevel gear 801. The two horizontal bevel gears are respectively meshed with the vertical bevel gear 801. The two horizontal bevel gears are respectively fixed at the ends of two vertical shafts. An extension pipe 601 is provided outside the spiral fan 701. Cooling coils 6 are fixedly provided at both ends of the extension pipe 601. The cooling coils 6 pass through the side wall of the gas mixing kettle 1 and extend above the gas mixing kettle 1. A liquid nitrogen joint 602 is provided at the port of the cooling coil 6. The liquid nitrogen joint 602 is connected to circulating liquid nitrogen.

[0031] In this embodiment, during the rotation of the fan, the mixed gas is agitated to form a vortex in the gas mixing kettle 1. At this time, the rotating turbine will pass through the cooling coil 6, and the two liquid nitrogen connectors 602 are docked to the circulating liquid nitrogen pump. After liquid nitrogen is introduced into the cooling coil 6, an extremely low temperature will be formed. The mixed gas of the vortex will quickly transfer heat to the liquid nitrogen and carry it out. When it is discharged from the gas mixing outlet 3, it will reach the normal temperature state. The density of the mixed gas in the normal temperature state will stabilize. During the operation of the screw fan 701, the horizontal axis 8 at the axis of the screw fan 701 will rotate synchronously. The vertical bevel gear 801 at the end of the horizontal axis 8 drives the rotation of the two vertical axes through two horizontal bevel gears at the same time. Then, the two gas mixing runners 802 will rotate in opposite directions along with the vertical axes, achieving the effect of linkage.

[0032] In a further embodiment of the present invention, as Figure 1 shown, the fixing device includes two bases 101. The bases 101 are fixedly connected to the concrete floor through expansion screws, and a layer of rubber pad is laid in the arc-shaped groove at the top of the bases 101.

[0033] In this embodiment, the gas mixing kettle 1 is fixed on the ground through two bases 101. The rubber pad can reduce the rigid collision with the gas mixing kettle 1, and thus can avoid the deformation of the gas mixing kettle 1.

[0034] In a further embodiment of the present invention, as Figures 1-2 shown, the sealing mechanism includes an annular groove at the edge of the port of the end cover 102. The front and rear port edges of the gas mixing kettle 1 are provided with arc-shaped strips inserted into the annular groove. The gas mixing kettle 1 and the outer side walls of the end covers 102 are fixedly connected through a bolt assembly block 103 in an annular array.

[0035] In this embodiment, when the gas mixing device inside the gas mixing kettle 1 is maintained, the bolt assembly block 103 is disassembled. Then, the two end covers 102 can be separated from the front and rear ports of the gas mixing kettle 1, and the staff can perform maintenance operations from the front and rear ports of the gas mixing kettle 1. Compared with the existing gas mixing kettle body, the previous gas mixing kettle body was relatively dense and could not be completely opened, which led to the inability to quickly maintain the core parts when they were damaged.

[0036] In a further embodiment of the present invention, as Figures 1-4 shown, the hydrogen injection device includes a hydrogen pressurization box 401 at the inner end of the hydrogen inlet 4. Two hydrogen silencing nozzles 402 are provided at the bottom of the hydrogen pressurization box 401. The jet directions of the natural gas silencing nozzle 202 and the hydrogen silencing nozzle 402 are perpendicular to each other.

[0037] In this embodiment, hydrogen is sprayed downward from the hydrogen silencing nozzle 402, and the jet directions of natural gas and hydrogen are perpendicular to each other. Then, natural gas and hydrogen are initially fused after passing through the device.

[0038] In a further embodiment of the present invention, as Figures 1-2 shown, the air flow testing mechanism includes a cylindrical plug inside the gas mixing outlet 3. A number of needle eye air channels arranged in an annular array are provided on the plug, and gas detectors are arranged in the needle eye air channels.

[0039] In this embodiment, the cooled mixed gas passes through the needle eye air channels on the plug. The plug can not only prevent air from leaking out of the gas mixing outlet instantaneously, but also the gas detectors in the needle eye air channels will detect the proportion of natural gas components inside each needle eye air channel. The deviation of the proportion of natural gas components inside each needle eye air channel can be used as a reference for air uniformity.

[0040] In a further embodiment of the present invention, as Figures 5-6 shown, the gas mixing assembly includes two vertical shafts rotatably arranged on the inner side wall of the gas mixing kettle 1. Gas mixing wheels 802 are arranged on the vertical shafts, and the two gas mixing wheels 802 rotate in opposite directions.

[0041] In this embodiment, when the mixed gas enters the middle position of the gas mixing kettle 1, the two gas mixing wheels 802 rotate in opposite directions at this time for secondary mixing, achieving the effect of efficient mixing.

[0042] It should be noted that for the foregoing embodiments, for the sake of simple description, they are all expressed as a series of action combinations. However, those skilled in the art should know that the present invention is not limited by the described action sequence, because according to the present invention, certain steps may be adopted in other sequences or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily essential to the present invention.

[0043] In several embodiments provided by the present application, it should be understood that the disclosed device can be implemented in other ways. For example, the device embodiments described above are only illustrative. For example, the above-mentioned unit division can have other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point, the shown or discussed coupling or communication connection between each other can be through some interfaces. The indirect coupling or communication connection between devices or units can be in the form of telecommunications or other forms.

[0044] The units described as separate components above may or may not be physically separated. The components shown as units may or may not be physical units, that is, they can be located in one place, or they can be distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0045] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the protection scope of the invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on these embodiments, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art can still, without conflict and without creative efforts, combine, add, delete or make other adjustments to the features in the embodiments of the present invention according to the circumstances, so as to obtain different technical solutions that do not essentially depart from the concept of the present invention, and these technical solutions also fall within the scope of protection of the present invention.

Claims

1. A hydrogen-doped natural gas pipeline regulation and testing device, characterized in that: It includes a gas mixing kettle (1), a fixing device is arranged at the bottom of the gas mixing kettle (1), end covers (102) are arranged at both ends of the gas mixing kettle (1), and a sealing mechanism is arranged between the gas mixing kettle (1) and the end covers (102); A natural gas inlet (2) is arranged on the front end cover (102), a natural gas injection device is arranged at the inner end of the natural gas inlet (2), a gas mixing outlet (3) is arranged on the rear end cover (102), an air flow testing mechanism is arranged inside the gas mixing outlet (3), a hydrogen inlet (4) and a pressure relief port (5) are arranged at the top end of the gas mixing kettle (1), and a hydrogen injection device is arranged at the inner end of the hydrogen inlet (4); A gas mixing component is arranged at the front side inside the gas mixing kettle (1), and a gas mixing cooling mechanism is arranged at the rear side inside the gas mixing kettle (1); The natural gas injection device includes a natural gas pressurizing box (201) at the inner end of the natural gas inlet (2), three natural gas silencing nozzles (202) are arranged on the side wall of the natural gas pressurizing box (201) facing away from the natural gas inlet (2), and a gas resistance tongue is arranged at the air outlet of the natural gas silencing nozzle (202); The gas mixing cooling mechanism includes a support frame (7) on the side wall of the gas mixing kettle (1), a spiral fan (701) is arranged on one side of the support frame (7), a horizontal shaft (8) is arranged on the axis of the fan blade of the spiral fan (701), an upright bevel gear (801) is arranged at the end of the horizontal shaft (8), horizontal bevel gears are arranged on both the upper and lower sides of the upright bevel gear (801), the two horizontal bevel gears are respectively meshed with the upright bevel gear (801), the two horizontal bevel gears are respectively fixed at the ends of two vertical shafts, an extension pipe (601) is arranged outside the spiral fan (701), a cooling coil pipe (6) is fixedly arranged at both ends of the extension pipe (601), the cooling coil pipe (6) passes through the side wall of the gas mixing kettle (1) and extends above the gas mixing kettle (1), a liquid nitrogen joint (602) is arranged at the port of the cooling coil pipe (6), and the liquid nitrogen joint (602) is connected to circulating liquid nitrogen.

2. The hydrogen-doped natural gas pipeline regulation and testing device according to claim 1, wherein: The fixing device includes two bases (101), the bases (101) are fixedly connected to the concrete floor through expansion screws, and a layer of rubber pad is laid in the arc-shaped groove at the top end of the bases (101).

3. The hydrogen-doped natural gas pipeline regulation and testing device according to claim 1, characterized in that: The sealing mechanism includes an annular groove at the edge of the port of the end cover (102), arc-shaped strips inserted into the annular groove are arranged at the front and rear port edges of the gas mixing kettle (1), and the outer side walls of the gas mixing kettle (1) and the end cover (102) are fixedly connected through bolt assembly blocks (103) arranged in an annular array.

4. The hydrogen-doped natural gas pipeline regulation and testing device according to claim 1, characterized in that: The hydrogen injection device includes a hydrogen pressurizing box (401) at the inner end of the hydrogen inlet (4), two hydrogen silencing nozzles (402) are arranged at the bottom end of the hydrogen pressurizing box (401), and the injection directions of the natural gas silencing nozzle (202) and the hydrogen silencing nozzle (402) are perpendicular to each other.

5. The hydrogen-doped natural gas pipeline regulation and testing device according to claim 1, wherein: The air flow testing mechanism includes a cylindrical plugging block inside the gas mixing outlet (3), a number of annularly arranged pinhole air channels are arranged on the plugging block, and gas detectors are arranged in the pinhole air channels.

6. The hydrogen-doped natural gas pipeline regulation and testing device according to claim 1, characterized in that: The gas mixing component includes two vertical shafts rotatably arranged on the inner side wall of the gas mixing kettle (1), and gas mixing runners (802) are arranged on the vertical shafts, and the two gas mixing runners (802) rotate in opposite directions.

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