Natural gas hydrogen-doped proportioning variable device

Abstract

The utility model relates to a natural gas hydrogen-doped ratio variable device which comprises a pressure balance unit, a gas mixing unit and an equipment skid body, the pressure balancing unit comprises a natural gas inlet valve, a hydrogen inlet valve, a pressure balancer, a first pressure gauge and a second pressure gauge; the gas mixing unit comprises a turbulent flow type proportional control valve, a third pressure gauge and a mixer outlet ball valve; the two units are integrally mounted on an equipment prying body; the interior of the pressure balancer is divided into two gas cavities through an elastic balance diaphragm, and the natural gas inlet valve and the hydrogen inlet valve are connected with the gas inlet ends of the two gas cavities through a front-end natural gas conveying pipeline and a front-end hydrogen conveying pipeline respectively. The gas outlet ends of the two gas cavities are connected with the two gas inlet ends of the turbulent flow type proportional control valve through a rear-end natural gas conveying pipeline and a rear-end hydrogen conveying pipeline respectively, and the gas outlet end of a mixer of the turbulent flow type proportional control valve is connected with a mixed gas conveying pipeline. According to the device, the mixing precision and the mixing uniformity are ensured.

Description

Technical Field

[0001] The utility model relates to the field of natural gas hydrogen blending, in particular to a natural gas hydrogen blending variable ratio device. Background Art

[0002] Hydrogen directly produces water during the combustion process and does not emit pollutants into the air. It is currently recognized as a clean energy source. However, high-concentration hydrogen is at risk of explosion during the combustion process. Therefore, current technology cannot meet the large-scale use requirements of high-concentration hydrogen. The calorific value of low-concentration hydrogen is relatively low and has no better utilization value. In view of the current low utilization rate, which causes the problem of hydrogen energy waste, if hydrogen and natural gas are mixed in a certain proportion and then burned and utilized, it can solve the environmental and energy utilization problems well. Therefore, it is urgent to design a gas supply system that mixes hydrogen and natural gas to improve the utilization rate of hydrogen. Among them, the device for mixing the two gases is the key structure of the gas supply system, which has a decisive influence on the mixing uniformity and accuracy. Utility Model Content

[0003] The utility model aims to overcome the deficiencies of the prior art and provide a safe and reliable natural gas hydrogen blending variable ratio device which is small in size and can ensure the blending accuracy and blending uniformity of the equipment.

[0004] The utility model solves the technical problem through the following technical solutions:

[0005] A variable ratio device for natural gas hydrogen blending, comprising a pressure balancing unit, a gas mixing unit and a skid body; the pressure balancing unit comprises a natural gas inlet valve, a hydrogen inlet valve, a pressure balancer, a first pressure gauge and a second pressure gauge; the gas mixing unit comprises a turbulent proportional control valve, a third pressure gauge and a mixer outlet ball valve; the pressure balancing unit and the gas mixing unit are integrally mounted on the skid body; all components of the pressure balancing unit and the gas mixing unit are explosion-proof components;

[0006] The pressure balancer is composed of two valve covers that are buckled and fixedly connected at both ends, forming an air cavity inside, and an elastic balance diaphragm is arranged in the air cavity. The two ends of the elastic balance diaphragm are clamped and fixed between the two ends of the two valve covers, so that the air cavity is divided into a first air cavity and a second air cavity; a first air inlet end and a first air outlet end are arranged on the valve cover wall corresponding to the first air cavity, and the first air inlet end is connected to the front-end natural gas transmission pipeline, and the natural gas inlet valve is installed on the front-end natural gas transmission pipeline; a second air inlet end and a second air outlet end are arranged on the valve cover wall corresponding to the second air cavity The second air inlet end is connected to the front-end hydrogen delivery pipeline, and the hydrogen inlet valve is installed on the front-end hydrogen delivery pipeline; the first air outlet end is connected to the natural gas inlet interface end arranged on the turbulent proportional control valve through the rear-end natural gas delivery pipeline, and the second air outlet end is connected to the hydrogen inlet interface end arranged on the turbulent proportional control valve through the rear-end hydrogen delivery pipeline: the mixer air outlet end arranged on the turbulent proportional control valve is connected to the mixed gas delivery pipeline, and the third pressure gauge and the mixer outlet ball valve are installed on the mixed gas delivery pipeline front and back.

[0007] Moreover, the turbulent proportional control valve includes a valve body, a gas flow channel is arranged inside, and a natural gas inlet end, a hydrogen inlet end and a mixer outlet end are arranged on the valve body; the natural gas inlet end and the hydrogen inlet end are connected with the mixer outlet end through their respective gas flow channels; a proportional adjustment rotor and a turbulent net are installed in the valve body, and the turbulent net is arranged in the valve body near the mixer outlet position; the proportional adjustment rotor is a manual adjustment rotor, which is inserted into a rotor mounting hole arranged on the upper part of the valve body in a manner that can be adjusted up and down and can be fixed, and the rotor mounting hole is connected with the gas flow channel of natural gas or the gas flow channel of hydrogen.

[0008] The advantages and positive effects of the utility model are:

[0009] 1. The utility model centrally installs the pressure balance unit and the gas mixing unit on a device skid, forming a modular design, which has the advantages of small size and convenience for on-site construction, and all components are explosion-proof components, ensuring the safety and reliability of the equipment.

[0010] 2. The utility model sets a pressure balancing unit before the gas mixing unit, so that natural gas and hydrogen with different pressures are input into the rear-end turbulent proportional control valve with the same pressure after the pressure is adjusted by the pressure balancer, so as to realize ratio adjustment and ensure the mixing accuracy and mixing uniformity of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a system diagram of a variable ratio device for blending hydrogen with natural gas according to the utility model;

[0012] Figure 2It is a cross-sectional view of the utility model of the turbulent proportional control valve;

[0013] In the figure: 1-valve cover; 2-second pressure gauge; 3-elastic balance diaphragm; 4-turbine proportional control valve; 4.1-valve body 4.1.1-natural gas inlet end; 4.1.2-hydrogen inlet end; 4.1.3-mixer outlet end; 4-2, proportional adjustment rotor; 4.3-turbine net; 4.4-means knob; 5-third pressure gauge; 6-mixer outlet ball valve; 7-first pressure gauge; 8-second air cavity; 9-first air cavity; 10, equipment skid; 11-natural gas inlet valve; 12-hydrogen inlet valve. DETAILED DESCRIPTION

[0014] The present invention will be further described in detail below through specific embodiments. The following embodiments are only descriptive and not restrictive, and the protection scope of the present invention cannot be limited by them.

[0015] A variable ratio device for natural gas hydrogen blending, see Figure 1-Figure 2 The invention point is: it includes a pressure balancing unit, a gas mixing unit and a skid body 10. The pressure balancing unit includes a natural gas inlet valve 11, a hydrogen inlet valve 12, a pressure balancer, a first pressure gauge 7, and a second pressure gauge 2; the gas mixing unit includes a turbulent proportional control valve 4, a third pressure gauge 5, and a mixer outlet ball valve 6. The pressure balancing unit and the gas mixing unit are integrated and installed on the skid body of the equipment; all components of the pressure balancing unit and the gas mixing unit are explosion-proof parts.

[0016] The pressure balancer is composed of two valve covers 1 that are buckled and fixedly connected at both ends by bolts, and an air cavity is formed inside. An elastic balance diaphragm 3 is arranged in the air cavity, and the two ends of the elastic balance diaphragm are clamped and fixed between the two ends of the two valve covers, so that the air cavity is divided into a first air cavity 9 and a second air cavity 8. A first air inlet end and a first air outlet end are arranged on the valve cover wall corresponding to the first air cavity, and the first air inlet end is connected to the front-end natural gas transmission pipeline. The natural gas inlet valve is installed on the front-end natural gas transmission pipeline to realize the input control of natural gas. A second air inlet end and a second air outlet end are arranged on the valve cover wall corresponding to the second air cavity, and the second air inlet end is connected to the front-end hydrogen transmission pipeline. The hydrogen inlet valve is installed on the front-end hydrogen transmission pipeline to realize the input control of hydrogen. The first air outlet end is connected to the natural gas inlet interface end arranged on the turbulent proportional control valve through the rear-end natural gas transmission pipeline, and the second air outlet end is connected to the hydrogen inlet interface end arranged on the turbulent proportional control valve through the rear-end hydrogen transmission pipeline. The gas outlet end of the mixer arranged on the turbulent proportional control valve is connected with a mixed gas delivery pipeline, and the third pressure gauge and the mixer outlet ball valve are installed front and back on the mixed gas delivery pipeline.

[0017] The elastic balance diaphragm adopts a flexible rubber diaphragm, and the purpose of balancing the pressure in the two air cavities is achieved through the deformation of the elastic balance diaphragm. The elastic balance diaphragm can stabilize the pressure of the equipment to maintain a specific balance pressure.

[0018] The spoiler type proportional control valve can set the blending ratio at will according to the hydrogen blending requirements. The spoiler type proportional control valve includes a valve body 4.1, which is provided with a gas flow channel. The gas flow channel includes a gas flow channel for natural gas and a gas flow channel for hydrogen, which meet at the end. Two air inlet ends and a mixer outlet end 4.1.3 are provided on the valve body, and a proportional adjustment rotor 4.2 and a spoiler net 4.3 are installed on the valve body. The spoiler net adopts an SV type spoiler net. The two air inlet ends are the natural gas inlet end 4.1.1 and the hydrogen inlet end 4.1.2, respectively. The natural gas inlet end and the hydrogen inlet end are connected to the mixer outlet end through their respective gas flow channels. The spoiler net is arranged in the valve body near the mixer outlet position. The spoiler net can be a cylindrical net formed by tightly winding a fine pore mesh with an aperture of 80-120μm in a vortex shape, and the adjacent layers of pores are staggered after winding. The proportional adjustment rotor is a manually adjustable rotor, which is inserted into the rotor mounting hole provided on the upper part of the valve body in an adjustable and fixed manner through threaded engagement. The rotor mounting hole is connected to the gas flow channel of natural gas or the gas flow channel of hydrogen. A convenient adjustment knob 4.4 is fixed at the upper end of the proportional adjustment rotor. The flow area of ​​the gas flow channel of natural gas or the gas flow channel of hydrogen is adjusted by rotating the proportional adjustment rotor, thereby achieving the adjustment of the mixing ratio of the two gases. The turbulent proportional control valve is a purely mechanical structure, which does not require an external power supply or instrument gas source.

[0019] Working principle of this natural gas hydrogen-blended emergency gas supply device:

[0020] A variable ratio device for blending natural gas with hydrogen is adopted. Natural gas and hydrogen of different pressures are respectively transported to the two air chambers of the pressure balancer through the front natural gas transmission pipeline and the front hydrogen transmission pipeline. The pressure balance of the two gases is adjusted by the deformation of the elastic balance diaphragm. The pressure-regulated natural gas is respectively transported to the two gas flow channels of the turbulent proportional control valve through the rear natural gas transmission pipeline and the pressure-regulated hydrogen is respectively transported through the rear natural gas transmission pipeline. After the ratio is adjusted, the gas flows around and is evenly blended at the ends of the two gas flow channels, and finally the final output is realized through the gas outlet end of the mixer and the mixed gas transmission pipeline, thereby achieving pressure balance and mixing.

[0021] The variable ratio device for blending natural gas with hydrogen is not only suitable for mixing natural gas and hydrogen, but also suitable for mixing two other gases, and has good applicability.

[0022] Although the embodiments and drawings of the present invention are disclosed for illustrative purposes, those skilled in the art will appreciate that various substitutions, changes and modifications are possible without departing from the spirit of the present invention and the appended claims. Therefore, the scope of the present invention is not limited to the contents disclosed in the embodiments and drawings.

Claims

1. A variable ratio device for natural gas hydrogen blending, characterized in that: It includes a pressure balancing unit, a gas mixing unit and a skid body; the pressure balancing unit includes a natural gas inlet valve, a hydrogen inlet valve, a pressure balancer, a first pressure gauge and a second pressure gauge; the gas mixing unit includes a turbulent proportional control valve, a third pressure gauge and a mixer outlet ball valve; the pressure balancing unit and the gas mixing unit are integrated and installed on the skid body, and all components of the pressure balancing unit and the gas mixing unit are explosion-proof components; The pressure balancer is composed of two valve covers that are buckled and fixedly connected at both ends, forming an air cavity inside, and an elastic balance diaphragm is arranged in the air cavity. The two ends of the elastic balance diaphragm are clamped and fixed between the two ends of the two valve covers, so that the air cavity is divided into a first air cavity and a second air cavity; a first air inlet end and a first air outlet end are arranged on the valve cover wall corresponding to the first air cavity, and the first air inlet end is connected to the front-end natural gas transmission pipeline, and the natural gas inlet valve is installed on the front-end natural gas transmission pipeline; a second air inlet end and a second air outlet end are arranged on the valve cover wall corresponding to the second air cavity The second air inlet end is connected to the front-end hydrogen delivery pipeline, and the hydrogen inlet valve is installed on the front-end hydrogen delivery pipeline; the first air outlet end is connected to the natural gas inlet interface end arranged on the turbulent proportional control valve through the rear-end natural gas delivery pipeline, and the second air outlet end is connected to the hydrogen inlet interface end arranged on the turbulent proportional control valve through the rear-end hydrogen delivery pipeline: the mixer air outlet end arranged on the turbulent proportional control valve is connected to the mixed gas delivery pipeline, and the third pressure gauge and the mixer outlet ball valve are installed on the mixed gas delivery pipeline front and back.

2. The variable ratio device for blending hydrogen into natural gas according to claim 1 is characterized in that: The turbulent proportional control valve comprises a valve body, a gas flow passage is arranged inside, a natural gas inlet end, a hydrogen inlet end and a mixer outlet end are arranged on the valve body; the natural gas inlet end and the hydrogen inlet end are connected with the mixer outlet end through their respective gas flow passages; a proportional adjustment rotor and a turbulent net are installed in the valve body, and the turbulent net is arranged in the valve body near the mixer outlet position; the proportional adjustment rotor is a manual adjustment rotor, which is inserted into a rotor mounting hole arranged on the upper part of the valve body in a manner that it can be adjusted up and down and can be fixed, and the rotor mounting hole is connected with the gas flow passage of natural gas or the gas flow passage of hydrogen.

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