Two-channel fluid adjustable fixed flow ratio device

Abstract

The utility model relates to a double-channel fluid adjustable 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 speed change device, so that the two rotary displacement pumps operate at a determined rotation speed ratio, and the 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 positive displacement pumps run at a set rotating speed ratio and fixed inlet and outlet pressure, so that the constant flow ratio of two fluids is ensured, additional power input is not needed, pure mechanical matching is adopted in the whole process, a complex automatic control system is not needed, the operation process is simplified, and the cost is reduced.

Description

Technical Field

[0001] This utility model relates to a dual-channel fluid adjustable fixed flow ratio device, belonging to the field of gas pipeline technology. Background Technology

[0002] Existing hydrogen blending devices all employ servo control technology. Based on the natural gas consumption, a hydrogen regulating valve controls the flow rate of hydrogen added to the natural gas. A static mixer then mixes the gases to ensure the hydrogen blending ratio does not exceed a set value (generally no more than 20% by volume), guaranteeing the safe and normal operation of downstream pipelines and appliances. Both the natural gas and hydrogen flow rates are measured using 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.

[0003] The problem with existing technologies is that the system composition is relatively complex, with many components, multiple leakage points, and a long control process chain. From data acquisition to final mixing and regulation control, multiple devices need to be combined to complete the process, resulting in low reliability. If a problem occurs in any of the acquired data, such as a gas flow meter malfunction or a power outage in the station control system, the system will not be able to work properly. To solve these problems, devices such as safety shut-off or UPS must be installed. At the same time, due to the complexity of the system composition, the cost of a highly reliable station control system is also high, resulting in a relatively high overall system cost, which is not conducive to the promotion of hydrogen blending of pipeline gas as an emission reduction technology. Summary of the Invention

[0004] This invention takes into account the relatively fixed hydrogen blending ratio of pipeline gas. In order to reduce the cost of hydrogen blending equipment, a device for setting the flow ratio is used to simplify the system composition. The natural gas metering, hydrogen metering and adjustable flow ratio device are integrated to form a dual-channel fluid adjustable fixed flow ratio device, which delivers hydrogen to the natural gas pipeline according to the set ratio to ensure that the proportion of hydrogen in the mixture does not exceed the hydrogen blending ratio value.

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

[0006] A dual-channel fluid adjustable fixed flow ratio device includes two unpowered rotary volumetric pumps. One of the two rotary volumetric pumps is driven by a first fluid, and the other is driven by a second fluid. The output shafts of the two rotary volumetric pumps are connected by a common speed change device 4, so that the two rotary volumetric pumps operate at a certain speed ratio, thereby realizing the transportation of the two fluids at a certain flow ratio.

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

[0008] Preferably, the rotary volumetric pump has two sets of rotating components, each set of rotating components including a lap wheel 1, a lap wheel shaft 2, and a synchronizing gear 3, wherein the lap wheel shaft 2 and the synchronizing gear 3 are coaxially arranged.

[0009] Furthermore, the waist wheel shaft 2 is connected to the transmission device 4.

[0010] Furthermore, the determined ratio ensures that the proportion of hydrogen is one of 5%, 10%, 15%, or 20%.

[0011] Preferably, the two rotary positive displacement pumps operate at their respective fixed inlet and outlet pressures.

[0012] The beneficial effects of this invention are as follows:

[0013] 1) Two interconnected rotary positive displacement pumps operate at a set speed ratio and fixed inlet and outlet pressures, ensuring a constant flow ratio of two fluids (such as hydrogen and natural gas). This design requires no additional power input, uses pure mechanical coordination throughout the process, and does not require a complex automatic control system, which greatly simplifies the operation process and reduces costs.

[0014] 2) The rotary positive displacement pump also has the function of measuring the volume of gas flowing through it, which further enhances the practicality and economy of the system. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the dual-channel fluid adjustable fixed flow ratio device of the present invention during use.

[0016] Figure 2 This is a schematic diagram of the structural principle of the dual-channel fluid adjustable fixed flow ratio device of the present invention.

[0017] Figure 3 yes Figure 2 Enlarged view on the left side of the middle section.

[0018] Figure 4 yes Figure 2 Enlarged view on the right side of the middle section.

[0019] In the diagram, 1. Lobe wheel, 2. Lobe wheel shaft, 3. Synchronizing gear, 4. Transmission device. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0021] In the energy sector, with the global pursuit of carbon reduction goals, innovative technologies are constantly emerging to achieve more efficient and cleaner energy use. In recent years, the development trend of natural gas hydrogen blending technology has been particularly noteworthy. This technology aims to improve energy efficiency and reduce environmental pollution by blending hydrogen into natural gas in a specific ratio. This embodiment details a dual-channel fluid adjustable fixed flow ratio device for blending hydrogen into natural gas in a specific ratio.

[0022] The core of the newly designed dual-channel adjustable constant flow ratio device lies in two interconnected rotary positive displacement pumps—one for hydrogen and the other for natural gas. These two pumps operate at a set 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, employs purely mechanical operation throughout, and eliminates the need for complex automatic control systems, greatly simplifying the operation process and reducing costs.

[0023] Principle explanation:

[0024] The unit uses two rotary volumetric pumps, one for processing hydrogen and the other for processing natural gas.

[0025] The dimensions and proportions of the two rotary positive displacement pumps are fixed, as are their inlet and outlet pressures.

[0026] The rotation of the two rotary volumetric pumps is connected by a fixed shaft or a gearbox, and the mixing ratio is set, such as 5%, 10%, 15%, 20%, etc.

[0027] Ultimately, the hydrogen and natural gas flow rates remain at the set ratio.

[0028] The rotary volumetric pump also functions as a gas volumetric flow meter, and it is planned to retain its mechanical counter to count the cumulative flow of natural gas and hydrogen passing through.

[0029] Main components:

[0030] Hydrogen-side rotary volumetric pump head: responsible for handling and transporting hydrogen.

[0031] Natural gas side rotary volumetric pump head: responsible for processing and transporting natural gas.

[0032] The specific plan is as follows:

[0033] See Figures 1-3A dual-channel fluid adjustable fixed flow ratio device includes two unpowered rotary volumetric pumps. One of the pumps is driven by a first fluid (natural gas), and the other by a second fluid (hydrogen). The output shafts of the two pumps are connected by a common speed change device 4, allowing the pumps to operate at a defined speed ratio, thereby achieving the delivery of the two fluids at a defined flow ratio. The two rotary volumetric pumps operate at their respective fixed inlet and outlet pressures.

[0034] In this embodiment, see Figure 1 The rotary volumetric pump has two sets of rotating components. Each set of rotating components includes a rotary wheel 1, a rotary wheel shaft 2, and a synchronous gear 3. The rotary wheel shaft 2 and the synchronous gear 3 are coaxially arranged.

[0035] In this embodiment, see Figure 1 The waist wheel shaft 2 is connected to the transmission device 4.

[0036] The main components of this device include a hydrogen-side rotary volumetric pump head, a natural gas-side rotary volumetric pump head, and a speed control system. The rotation of the two pump heads is interconnected and can be linked by a speed control to ensure synchronized operation, ultimately enabling the delivery of hydrogen and natural gas in a predetermined ratio (e.g., 5% or 10%). The rotary volumetric pump also has the function of measuring the volume of gas flowing through it, further enhancing the system's practicality and economy.

[0037] This invention utilizes two interconnected rotary positive displacement pumps operating at a set rotational speed ratio and fixed inlet and outlet pressures to ensure a constant delivery ratio of two fluids (such as hydrogen and natural gas). This design requires no additional power input, employing purely mechanical operation throughout, eliminating the need for complex automatic control systems, thus greatly simplifying the operation process and reducing costs. The rotary positive displacement pumps also have the function of measuring the volume of gas flowing through them, further enhancing the system's practicality and economy.

[0038] The above are preferred embodiments of the present invention. Those skilled in the art can make their own modifications or improvements based on this, and such modifications or improvements should fall within the scope of protection claimed by the present invention without departing from the overall concept of the present invention.

Claims

1. A dual-channel fluid adjustable fixed flow ratio device, characterized in that: It includes two unpowered rotary positive displacement pumps, one of which is driven by a first fluid and the other by a second fluid; The output shafts of the two rotary volumetric pumps are connected by a common speed change device (4), so that the two rotary volumetric pumps operate at a certain speed ratio, thereby realizing the transportation of the two fluids at a certain flow ratio. The rotary volumetric pump has two sets of rotating components. Each set of rotating components includes a lap wheel (1), a lap wheel shaft (2), and a synchronizing gear (3). The lap wheel shaft (2) and the synchronizing gear (3) are coaxially arranged.

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

3. The dual-channel fluid adjustable fixed flow ratio device as described in claim 1, characterized in that: The waist wheel shaft (2) is connected to the transmission device (4).

4. The dual-channel fluid adjustable fixed flow ratio device as described in claim 2, characterized in that: The determined ratio ensures that the proportion of hydrogen is one of 5%, 10%, 15%, or 20%.

5. The dual-channel fluid adjustable fixed flow ratio device as described in claim 1, characterized in that: The two rotary positive displacement pumps operate at their respective fixed inlet and outlet pressures.

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