A natural gas and hydrogen mixing heating device

Abstract

The present invention discloses a natural gas and hydrogen mixing and heating device, which relates to the technical field of natural gas hydrogen mixing; it includes a coarse mixing structure, which is arranged in an inlet pipe, and is used to achieve the first-stage mixing of natural gas and hydrogen; a fine mixing structure, which is arranged in a shell and is higher than the inlet pipe, and is used to achieve the second-stage mixing of natural gas and hydrogen; an electric heater, which is arranged on the top of the shell, and heats the mixed gas. This device integrates the two-stage mixing structure of coarse mixing and fine mixing, and is provided with a heater, forming an integrated and efficient system. This enables a single device to simultaneously complete the two-stage mixing and heating functions, and at the same time achieves sufficient mixing of natural gas and hydrogen, thereby improving the mixing efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of natural gas mixed with hydrogen, and in particular to a natural gas and hydrogen mixed heating device. Background Art

[0002] As the global demand for clean energy continues to grow, natural gas mixed with hydrogen fuel is gradually occupying an important position in the field of gas-fired power generation due to its excellent high calorific value characteristics and significant low carbon emission advantages. More and more gas-fired power plants choose to use this mixed fuel as an energy supply in order to ensure power generation efficiency while reducing the impact on the environment.

[0003] However, in the current application of natural gas mixed with hydrogen fuel, a commonly used method is to initially mix natural gas and hydrogen, then transport them to a special heater through a pipeline system for heating, and then transport the heated mixed gas to a gas turbine through another pipeline for combustion and power generation. Although this solution meets the operating needs of gas power plants to a certain extent, it hides several problems that need to be solved:

[0004] 1. As most systems are currently equipped with only one-stage blending device, this design limitation results in insufficient mixing of natural gas and hydrogen, and it is difficult to achieve ideal mixing uniformity. This not only affects the stability and efficiency of the subsequent combustion process, but may also have an adverse impact on the operation of key equipment such as gas turbines.

[0005] 2. The independent spatial arrangement of the mixing device and the heating device, as well as the design of connecting them through long-distance pipelines, not only increases the complexity and maintenance difficulty of the entire system, but also significantly increases the risk of leakage. Once a leak occurs at the pipeline connection, it will not only cause energy waste and environmental pollution, but may also pose a serious threat to production safety. In addition, long-distance pipeline transmission will also increase the pressure drop loss of the mixed gas and reduce the overall efficiency of the system. At the same time, this layout also occupies more land resources, which is not conducive to the intensive and sustainable development of power plants. Summary of the invention

[0006] The purpose of the present invention is to provide a natural gas and hydrogen mixing and heating device, which realizes two-stage mixing and heating functions, and makes the natural gas and hydrogen mixed more fully, can significantly reduce the occupied area, and reduce the risk of leakage.

[0007] To achieve the above purpose, the technical solution of the present application is: a natural gas and hydrogen mixing heating device, comprising:

[0008] A coarse blending structure is arranged in the inlet pipeline and is used to achieve the first-stage mixing of natural gas and hydrogen;

[0009] A fine blending structure, arranged in the shell and higher than the inlet pipe, is used to achieve a second-stage mixing of natural gas and hydrogen;

[0010] The electric heater is arranged on the top of the shell to heat the mixed gas.

[0011] In one embodiment, it also includes,

[0012] The guide tube is arranged on the upper part of the shell and is located between the fine mixing structure and the electric heater. The end thereof is in a bell-mouth shape and is used to guide the mixed gas into the electric heater to change the flow state.

[0013] In one of the embodiments, the coarse mixing structure includes swirl blades and a central tube, and the swirl blades are welded to the outer periphery of the central tube and to the inner wall of the inlet pipe.

[0014] In one embodiment, the fine mixing structure includes a distribution plate and distribution elements. The distribution plate is a cone structure with an opening that gradually increases from bottom to top, and the inner wall of the cone structure is formed with multiple steps, and each step has a number of distribution elements evenly arranged along the circumferential direction.

[0015] In one embodiment, the distribution element has an air inlet channel, which is connected to the side air outlet channel and the top air outlet channel.

[0016] In one of the embodiments, the side outlet channels are inclined downward and are evenly opened on the upper part of the side wall of the distribution element, and the top outlet channels are opened on the top of the distribution element.

[0017] In one embodiment, the mixed gas that has passed through the coarse mixing structure enters the air inlet channel from the bottom inlet of the distribution element and forms a vortex in the air inlet channel. Under the action of the vortex, the mixed gas molecules are accelerated to collide and fully mixed again, and then rotate and flow out through the side outlet channel and the top outlet channel.

[0018] In one embodiment, the diameter of the side outlet channel is greater than the diameter of the top outlet channel.

[0019] In one of the embodiments, the distribution element has a clamping platform in the middle, the lower part of the clamping platform is threadedly connected to the distribution disk, and the clamping platform is located on a step.

[0020] In one embodiment, the shell is provided with an upper manhole and a lower manhole, wherein the upper manhole is used for maintenance personnel to enter the shell to check whether the distribution element is damaged or blocked; the lower manhole is used for maintenance personnel to enter the shell to check whether the swirl blades are damaged or deformed.

[0021] Due to the adoption of the above technical solution, the present invention can achieve the following technical effects: the device integrates a two-stage blending structure of coarse blending and fine blending, and is provided with a heater to form an integrated high-efficiency system, so that a single device can simultaneously complete the two-stage blending and heating functions, and at the same time achieve full mixing of natural gas and hydrogen, thereby improving the blending efficiency. In addition, the high degree of functional integration not only reduces the floor space, but also effectively reduces potential leakage risk points, ensuring the safety and economy of equipment operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 This is a schematic diagram of the overall structure of a natural gas and hydrogen mixing heating device;

[0024] Figure 2 It is a schematic diagram of the rough blending structure;

[0025] Figure 3 It is a schematic diagram of the distributed component structure;

[0026] Figure 4 Schematic diagram of the distribution plate structure;

[0027] Figure 5 Schematic diagram of the connection between the distribution element and the distribution plate.

[0028] Explanation of the serial numbers in the figure: 1. Support; 2. Shell; 3. Conical shell; 4. Shell flange; 5. Electric heater; 6. Inlet flange; 7. Conical inlet; 8. Inlet pipe; 9. Swirl blade; 10. Outlet pipe; 11. Outlet flange; 12. Upper manhole; 13. Lower manhole; 14. Dust removal pipe; 15. Distribution plate; 16. Distribution element; 161. Top air outlet channel; 162. Side air outlet channel; 163. Card table; 164. Air inlet channel; 17. Guide tube; 18. Center tube. DETAILED DESCRIPTION

[0029] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0030] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0031] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, "multiple" means two or more, unless otherwise clearly and specifically defined. "Several" means one or more, unless otherwise clearly and specifically defined.

[0032] In the description of the present application, it should be understood that the terms "center", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply 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 a limitation on the present application.

[0033] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0034] See also Figure 1 This embodiment provides a natural gas and hydrogen mixed heating device, comprising:

[0035] The main body structure includes a shell 2 arranged on a support 1, the top of the shell 2 has a cone shell 3, the cone shell 3 is connected to a shell flange 4, and the shell 2 is provided with an upper manhole 12 and a lower manhole 13; preferably, the bottom of the shell 2 is connected to a concave sealing plate, and the concave sealing plate is connected to a dust removal duct 14;

[0036] An inlet structure, arranged at the lower part of the housing 2, comprises an inlet flange 6, a cone inlet 7 and an inlet pipe 8 connected in sequence;

[0037] The outlet structure is arranged on the cone shell 3 and has an outlet pipe 10 and an outlet flange 11 connected in sequence;

[0038] Coarse blending structure, such as Figure 2 As shown, it is welded in the inlet pipe 8 to achieve the first-stage mixing of natural gas and hydrogen; the structure includes swirl blades 9 and a central tube 18, the swirl blades 9 are welded to the outer periphery of the central tube 18 and welded to the inner wall of the inlet pipe 8, and the two ends of the central tube 18 are blocked;

[0039] The fine blending structure is arranged in the shell 2 and higher than the inlet pipe 8, and is used to achieve the second-stage mixing of natural gas and hydrogen; Figures 3 to 5 As shown, the structure includes a distribution plate 15 and a distribution element 16 welded in the shell 2. The distribution plate 15 is a cone structure with an opening gradually increasing from bottom to top, which is conducive to uniform distribution of gas, and the inner wall of the cone structure is formed with multiple steps, and each step is evenly provided with a number of distribution elements 16 along the circumferential direction. The distribution element 16 has a clamping platform 163 in the middle, and the lower part of the clamping platform 163 is threadedly connected to the distribution plate 15, and the clamping platform 163 is located on the step;

[0040] The electric heater 5 is connected to the housing flange 4 by bolts to heat the mixed gas;

[0041] The guide tube 17 is welded inside the conical shell 3 and extends into the top of the shell body 2. The end thereof is in a trumpet shape, which can fully guide the mixed gas into the heating area of ​​the electric heater 5. At the same time, it can change the flow state of the mixed gas, increase the flow velocity in the area of ​​the electric heater 5, and enhance the heat transfer effect. The guide tube 17 is welded to the outlet pipe 10.

[0042] During operation, natural gas and hydrogen are first mixed in the first stage through the coarse mixing structure, which can achieve a mixing accuracy of about 85%. After the mixed gas passes through the coarse mixing structure, the speed of the mixed gas decreases after entering the shell 2 and passes through the distribution element 16 in the fine mixing structure at a uniform speed. A plurality of side outlet channels 162 inclined downward are opened on the side wall of the distribution element 16, and a top outlet channel 161 is opened on the top. When the mixed gas passes through the bottom inlet of the distribution element 16, the mixed gas forms a gas vortex in the air inlet channel 164 of the distribution element 16 under the action of the high flow rate at the inlet, so that the mixed gas molecules are accelerated to collide and fully mixed again, and then rotate and flow out through the side outlet channel 162 and the top outlet channel 161. Since the diameter of the side gas outlet channel 162 is larger than that of the top gas outlet channel 161, most of the mixed gas is preferentially swirled out through the side gas outlet channel 162, and a small part of the mixed gas is swirled out through the top gas outlet channel 161. This can not only ensure that the mixed gas is fully mixed in the distribution element 16 to improve the mixing effect, but also reduce the pressure drop loss of the mixed gas after passing through the distribution element 16. The fine mixing structure can achieve 100% mixing accuracy, and then the 100% mixed mixed gas is evenly heated through the guide tube 17 and the electric heater 5. The high-temperature mixed gas enters the downstream device through the outlet structure, and the impurities in the mixed gas passing through the fine mixing structure are removed through the dust removal pipe 14.

[0043] During maintenance, remove the connecting bolts between the electric heater 5 and the shell flange 4, pull out the electric heater 5, enter the shell 2 through the upper manhole 12, and check whether the distribution element 16 is damaged or blocked; enter the shell 2 through the lower manhole 13 to check whether the swirl blades 9 are damaged or deformed.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A natural gas and hydrogen mixed heating device, characterized in that: include: A coarse blending structure is arranged in the inlet pipeline and is used to achieve the first-stage mixing of natural gas and hydrogen; A fine mixing structure is arranged in the shell and higher than the inlet pipe, and is used to achieve the second-stage mixing of natural gas and hydrogen; the fine mixing structure includes a distribution plate and a distribution element, the distribution plate is a cone structure with an opening gradually increasing from bottom to top, and the inner wall of the cone structure is formed with multiple steps, and each step is evenly provided with a number of distribution elements along the circumferential direction; the distribution element has an air inlet channel, and the air inlet channel is connected with the side outlet channel and the top outlet channel; The side outlet channels are inclined downward and are evenly arranged on the upper part of the side wall of the distribution element, and the top outlet channels are arranged on the top of the distribution element; the diameter of the side outlet channels is greater than that of the top outlet channels; The electric heater is arranged on the top of the shell to heat the mixed gas.

2. A natural gas and hydrogen mixed heating device according to claim 1, characterized in that: Also includes, The guide tube is arranged on the upper part of the shell and is located between the fine mixing structure and the electric heater. The end thereof is in a trumpet shape and is used for guiding the mixed gas into the electric heater.

3. A natural gas and hydrogen mixed heating device according to claim 1, characterized in that: The coarse mixing structure comprises swirl blades and a central tube. The swirl blades are welded to the outer periphery of the central tube and to the inner wall of the inlet pipe.

4. A natural gas and hydrogen mixed heating device according to claim 1, characterized in that: The mixed gas that has passed the coarse mixing structure enters the air inlet channel from the bottom inlet of the distribution element and forms a vortex in the air inlet channel. Under the action of the vortex, the mixed gas molecules accelerate and collide and mix fully again, and then rotate and flow out through the side outlet channel and the top outlet channel.

5. A natural gas and hydrogen mixed heating device according to claim 1, characterized in that: The distribution element has a clamping platform in the middle, the lower part of the clamping platform is threadedly connected with the distribution disc, and the clamping platform is located on the step.

6. A natural gas and hydrogen mixed heating device according to claim 1, characterized in that: The shell is provided with an upper manhole and a lower manhole, wherein the upper manhole is used for maintenance personnel to enter the shell to check whether the distribution element is damaged or blocked; the lower manhole is used for maintenance personnel to enter the shell to check whether the swirl blades are damaged or deformed.

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