Double-channel fluid fixed flow ratio device

Abstract

The utility model relates to a double-channel fluid fixed flow ratio device which comprises two unpowered rotary displacement pumps, one of the two rotary displacement pumps takes first fluid as pushing power, and the other rotary displacement pump takes second fluid as pushing power. The output shafts of the two rotary displacement pumps are connected through a common shaft, so that the two rotary displacement pumps operate at a determined rotation speed ratio, and two fluids are conveyed at a determined flow ratio; the rotary positive displacement pump is provided with two sets of rotating parts, each set of rotating part comprises a waist wheel, a waist wheel shaft and a synchronous gear, and the waist wheel shaft and the synchronous gear are coaxially arranged. The two mutually-connected rotary displacement pumps run at a fixed rotating speed ratio and fixed inlet and outlet pressure, the constant flow ratio of the two fluids is guaranteed, additional power input is not needed, pure mechanical cooperation is adopted in the whole process, a complex automatic control system is not needed, the rotary displacement pumps further have the function of measuring the volume of flowing gas, and therefore the flow rate of the two fluids can be measured. And the economical efficiency of the system is enhanced.

Description

Technical Field

[0001] The utility model relates to a dual-channel fluid fixed flow ratio device, belonging to the technical field of gas pipelines. Background Art

[0002] Existing hydrogen blending devices all adopt follow-up control technology. According to the consumption of natural gas, a hydrogen regulating valve is used to control the flow rate of hydrogen added to natural gas, and then a static mixer is used for mixing to make it meet the requirement that the hydrogen blending ratio does not exceed the set value (generally, the volume ratio does not exceed 20%), ensuring the safe and normal operation of the downstream pipe network and gas stoves. The flow rates of both natural gas and hydrogen are measured by gas flow meters. Therefore, the entire hydrogen blending device mainly includes a natural gas flow meter, a hydrogen flow meter, a static mixer, a hydrogen regulating valve, and a station control system, etc.

[0003] The problems of the existing technology are that the system composition is relatively complex, there are many components and leakage points, and the control process chain is relatively long. It requires a combination of multiple devices to complete from data acquisition to final mixing and adjustment control, and the reliability is not high. If there is a problem with a certain collected data during the process, such as a stuck meter fault of the natural gas flow meter or a power outage of the station control system, it will cause the system to fail to operate normally. To solve these problems, some devices such as safety cut-off or UPS must be installed. At the same time, due to the complex system composition, the cost of the station control system with high reliability is also high, and the total system cost will be relatively high, which is not conducive to the popularization of the emission reduction technology of hydrogen blending in pipeline gas. Summary of the Invention

[0004] Considering the relative fixity of the hydrogen blending ratio in pipeline gas, in order to reduce the cost of hydrogen blending equipment, the present invention adopts a device with a fixed flow ratio to simplify the system composition, integrates natural gas metering, hydrogen metering, and a fixed flow ratio device to form a dual-channel fluid fixed flow ratio device, and transports hydrogen to the natural gas pipeline network at a fixed ratio to ensure that the proportion of hydrogen in the mixed gas does not exceed the hydrogen blending ratio value.

[0005] The present invention adopts the following technical solutions:

[0006] A dual-channel fluid fixed flow ratio device includes two non-powered rotary positive displacement pumps. One of the two rotary positive displacement pumps is driven by a first fluid, and the other is driven by a second fluid; the output shafts of the two rotary positive displacement pumps are connected by a common shaft 4, so that the two rotary positive displacement pumps operate at a determined speed ratio, thereby realizing the transportation of the two fluids at a determined flow ratio.

[0007] Optionally, the first fluid is natural gas and the second fluid is hydrogen.

[0008] Optionally, a heat exchanger for heat exchange of two fluids with fixed flow rates is used for flow distribution.

[0009] Preferably, the rotary positive-displacement pump has two sets of rotating components. Each set of rotating components includes a lobe 1, a lobe shaft 2, and a synchronous gear 3. The lobe shaft 2 and the synchronous gear 3 are coaxially arranged.

[0010] Further, the lobe shaft 2 is connected to the shaft 4.

[0011] Furthermore, the shaft 4 is a shaft connecting the lobes of two rotary positive-displacement pumps.

[0012] Further, the determined ratio ensures that the proportion of hydrogen is one of 5%, 10%, 15%, and 20%.

[0013] Preferably, the two rotary positive-displacement pumps operate at their respective fixed inlet and outlet pressures.

[0014] The beneficial effects of the present invention are as follows:

[0015] 1) Two interconnected rotary positive-displacement pumps operate at a fixed rotational speed ratio and fixed inlet and outlet pressures, ensuring a constant flow rate ratio of two fluids (such as hydrogen and natural gas). This design requires no additional power input and uses pure mechanical cooperation throughout, eliminating the need for a complex automatic control system, greatly simplifying the operation process and reducing costs.

[0016] 2) The rotary positive-displacement pump also has the function of measuring the volume of the flowing gas, further enhancing the practicality and economy of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic diagram of the present invention's dual-channel fluid fixed flow rate ratio device during use.

[0018] Figure 2 is a structural schematic diagram of the present invention's dual-channel fluid fixed flow rate ratio device.

[0019] Figure 3 is Figure 2 the enlarged view on the left side in

[0020] Figure 4 is Figure 2 the enlarged view on the right side in

[0021] In the figure, 1. lobe, 2. lobe shaft, 3. synchronous gear, 4. shaft. DETAILED DESCRIPTION OF THE INVENTION

[0022] The present invention will be further described below in conjunction with the drawings and specific embodiments.

[0023] Embodiment 1:

[0024] In the energy field, with the global pursuit of carbon reduction goals, innovative technologies are emerging continuously to achieve more efficient and cleaner energy use. In recent years, the development trend of hydrogen blending in natural gas has been particularly remarkable. By blending hydrogen into natural gas in a certain proportion, it aims to improve energy efficiency and reduce environmental pollution. This embodiment details a dual-channel fluid fixed flow ratio device for blending hydrogen into natural gas in a certain proportion.

[0025] The core of the newly designed natural gas hydrogen blending device lies in two interconnected rotary positive displacement pumps - one for delivering hydrogen and the other for delivering natural gas. These two pumps operate at a fixed rotational speed ratio and fixed inlet and outlet pressures, ensuring a constant flow ratio of hydrogen to natural gas. This design requires no additional power input and uses pure mechanical coordination throughout, eliminating the need for a complex automatic control system, greatly simplifying the operation process and reducing costs.

[0026] Principle introduction:

[0027] The device uses two rotary positive displacement pumps, one for handling hydrogen and the other for handling natural gas.

[0028] The sizes and ratios of the two rotary positive displacement pumps are fixed, and the inlet and outlet pressures are fixed.

[0029] The rotations of the two rotary positive displacement pumps are connected by a fixed shaft or a transmission, and a fixed mixing ratio is set, such as 5%, 10%, 15%, 20%, etc.

[0030] Finally, the flow rates of hydrogen and natural gas remain in a fixed ratio.

[0031] The rotary positive displacement pump also serves as a volumetric flowmeter for the gas, and it is planned to retain its mechanical counter to count the cumulative flow rates of the natural gas and hydrogen passing through.

[0032] Main components:

[0033] Hydrogen-side rotary positive displacement pump head: Responsible for handling and delivering hydrogen.

[0034] Natural gas-side rotary positive displacement pump head: Responsible for handling and delivering natural gas.

[0035] Shaft 4: Connects the rotating shafts of the two rotary positive displacement pumps to ensure synchronous operation.

[0036] The specific solution is as follows:

[0037] See Figures 1 - 3, A dual-channel fluid fixed flow ratio device includes two non-powered rotary positive displacement pumps. One of the two rotary positive displacement pumps is driven by a first fluid (natural gas), and the other is driven by a second fluid (hydrogen). The output shafts of the two rotary positive displacement pumps are connected by a common shaft 4, so that the two rotary positive displacement pumps operate at a determined speed ratio, thereby realizing the transportation of the two fluids at a determined flow ratio. The two rotary positive displacement pumps operate at their respective fixed inlet and outlet pressures.

[0038] In this embodiment, refer to Figure 1 , The rotary positive displacement pump has two sets of rotating components. Each set of rotating components includes a lobe 1, a lobe shaft 2, and a synchronizing gear 3. The lobe shaft 2 and the synchronizing gear 3 are coaxially arranged.

[0039] In this embodiment, refer to Figure 1 , The lobe shaft 2 is connected to the shaft 4.

[0040] In this embodiment, refer to Figure 1 , The shaft 4 is the shaft connecting the lobes of the two rotary positive displacement pumps.

[0041] The main components of this device include a hydrogen-side rotary positive displacement pump head, a natural gas-side rotary positive displacement pump head, and a speed-changing device. The rotations of the two pump heads are connected, and can be fixedly connected by a shaft or connected by a transmission to ensure their synchronous operation, ultimately enabling hydrogen and natural gas to be transported in a predetermined ratio (such as 5% or 10%). The rotary positive displacement pump also has the function of measuring the volume of the flowing gas, further enhancing the practicability and economy of the system.

[0042] The two interconnected rotary positive displacement pumps of the present invention operate at a fixed speed ratio and fixed inlet and outlet pressures, ensuring a constant transportation ratio of the two fluids (such as hydrogen and natural gas). This design requires no additional power input, adopts pure mechanical cooperation throughout, relies only on the thrust of the fluid itself, and does not require a complex automatic control system, greatly simplifying the operation process and reducing costs. The rotary positive displacement pump also has the function of measuring the volume of the flowing gas, further enhancing the practicability and economy of the system.

[0043] Embodiment 2:

[0044] The difference from Embodiment 1 is that the dual-channel fluid fixed flow ratio device of the present application can also be used for: flow distribution of a heat exchanger that exchanges heat between two fluids with a fixed flow rate.

[0045] The above are the preferred embodiments of the present invention. Those of ordinary skill in the art can also make various transformations or improvements based on this. Without departing from the overall concept of the present invention, these transformations or improvements should all fall within the scope of protection required by the present invention.

Claims

1. A dual-channel fluid fixed flow ratio device, characterized in that: It includes two non-powered rotary positive displacement pumps, one of the two rotary positive displacement pumps is driven by the first fluid, and the other is driven by the second fluid; The output shafts of the two rotary positive displacement pumps are connected by a common shaft (4), so that the two rotary positive displacement pumps operate at a determined speed ratio, thereby realizing the transportation of the two fluids at a determined flow ratio; The rotary positive displacement pump has two sets of rotating components, and each set of rotating components includes a lobe (1), a lobe shaft (2), and a synchronous gear (3), and the lobe shaft (2) is coaxially arranged with the synchronous gear (3).

2. The dual-channel fluid fixed flow ratio device according to claim 1, characterized in that: The first fluid is natural gas, and the second fluid is hydrogen.

3. The dual-channel fluid fixed flow ratio device according to claim 1, wherein: A heat exchanger for heat exchange of two fluids with a fixed flow rate is used for flow distribution.

4. The dual-channel fluid fixed flow ratio device according to claim 1, wherein: The lobe shaft (2) is connected to the shaft (4).

5. The dual-channel fluid fixed flow ratio device according to claim 2, wherein: The determined ratio ensures that the proportion of hydrogen is one of 5%, 10%, 15%, and 20%.

6. The dual-channel fluid fixed flow ratio device according to claim 1, wherein: The two rotary positive displacement pumps operate at their respective fixed inlet and outlet pressures.

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