CN110433717B

CN110433717B - Preparation device, method and application of hedging mixed nano hydrogen bubble/diesel oil mixed fuel

Info

Publication number: CN110433717B
Application number: CN201910579114.9A
Authority: CN
Inventors: 吕刚; 马宇乾; 宋崇林; 张伟
Original assignee: Tianjin University
Current assignee: Tianjin University
Priority date: 2019-06-28
Filing date: 2019-06-28
Publication date: 2022-02-08
Anticipated expiration: 2039-06-28
Also published as: CN110433717A

Abstract

The invention discloses a preparation method of an opposite-impact mixed nano hydrogen bubble/diesel mixed fuel, wherein hydrogen is respectively supplied to a multistage mixer at the same preset constant pressure within the range of 0.1-3 MPa by a hydrogen cylinder after pressure reduction and pressure regulation; adding diesel oil into the first mixer at constant speed, mixing into a mixture of hydrogen and hydrogen/diesel oil solution under the action of the corrugated pipe wall of the first mixer, sequentially entering a subsequent mixer for further mixing, entering a buffer, releasing the pressure of the mixture of hydrogen and hydrogen/diesel oil solution stabilized by the buffer, and then entering an oil/gas separator for separation to obtain the nano hydrogen bubble/diesel oil mixed fuel. When the nano hydrogen bubble/diesel oil mixed fuel is combusted, the diesel engine only needs one set of oil supply system and does not need to adjust the hardware of the oil supply system; can improve the economy and the discharge performance of the diesel engine, can improve the preparation efficiency of the mixed fuel, and is more suitable for the industrialized production of the nano hydrogen bubble/diesel mixed fuel.

Description

Preparation device, method and application of hedging mixed nano hydrogen bubble/diesel oil mixed fuel

Technical Field

The invention belongs to the technology of replacing fuel by an internal combustion engine, and particularly relates to a continuous preparation method of a nano hydrogen bubble/diesel oil mixed fuel capable of being used as diesel engine fuel.

Background

The diesel engine has high thermal efficiency, strong power, firmness and durability, and occupies an absolutely dominating position in the field of heavy-duty transportation power sources in China, but the petroleum refining level in China is not high, and the quality and the supply quantity of diesel oil have a certain distance compared with the domestic requirements at the present stage. At present, experts in automobile and internal combustion engine industries at home and abroad have recognized that modification or replacement aiming at traditional diesel fuel is one of the most effective technical measures for meeting the development strategy of energy conservation and emission reduction of diesel engines.

Hydrogen (H)₂) The diesel engine is high-efficiency and clean energy, and pure hydrogen (including a hydrogen/diesel dual-fuel mode) is combusted on the diesel engine or the hydrogen and the diesel are simultaneously combusted in a mixing combustion mode, so that the heat efficiency of the diesel engine can be improved, and the pollutant emission can be reduced. The existing hydrogen and diesel oil mixing combustion mode comprises hydrogen/diesel oilThe fuel injection system comprises two working modes of in-cylinder injection, hydrogen gas inlet channel injection, in-cylinder injection of diesel oil and the like. However, the two mixed combustion modes require 2 sets of independent fuel injection systems, which not only results in high hardware cost and difficult arrangement of the fuel injection systems, but also ensures that the hydrogen and the diesel which are respectively injected can achieve the best matching effect, and the air intake optimization and the combustion organization of the dual-injection system internal combustion engine, even the matching calibration, are much more complicated than those of the single-injection system internal combustion engine.

To achieve hydrogen/diesel blended combustion on a single fuel supply system diesel engine, it is necessary to uniformly disperse the hydrogen in the diesel to form a homogeneous mixture. However, at normal temperature and pressure, the solubility of hydrogen in diesel is low, and it is not practical to realize efficient and clean combustion of diesel engines by burning hydrogen/diesel solution. Therefore, an innovative hydrogen/diesel mixing technical approach must be developed to prepare the hydrogen/diesel mixed fuel with practical application value.

It is often seen in life that bubbles are easily generated in water containing a surfactant, and the smaller the diameter of the bubbles, the longer the bubbles exist. Based on the above principle, from the end of the last century, research institutes in japan, europe, america and other countries have developed a novel heterogeneous homogeneous mixture preparation technology, i.e., a water/air (or other gas having hydrophobicity such as hydrogen) microbubble mixture preparation technology, and the technology has been commercially applied in large scale in the fields of oil exploitation, medical imaging and the like. Because the dispersed phase of hydrophobic gas is difficult to dissolve in the water continuous phase with strong polarity and the stability of bubbles in water is poor, the core of the water-based microbubble mixing technology is a surfactant, and a protective film is formed on a gas/water interface to stabilize a bubble structure by adding the surfactant with proper type and concentration into the continuous phase, so that the gas which is insoluble in water is dispersed into nano-scale and submicron-scale micro-stable bubbles in water to realize the preparation of a metastable gas/liquid uniform mixture. However, hydrogen and diesel oil both have hydrophobicity, the principle of hydrophilic/hydrophobic action of the surfactant is not suitable for the hydrogen and diesel oil microbubble mixing process, and most of the surfactants have adverse effects on in-cylinder combustion of the diesel engine, so that a brand-new preparation method of the hydrogen/diesel oil microbubble mixed fuel needs to be developed.

The research results at home and abroad show that the solubility of hydrogen in diesel oil can be obviously improved by increasing the pressure of hydrogen, for example, the solubility of hydrogen in diesel oil at normal temperature and normal pressure is 0.0110 (mole fraction), and the solubility of hydrogen in diesel oil is improved to 0.0369 (mole fraction) after the pressure of hydrogen is increased to 2 MPa. On the other hand, when the hydrogen pressure is reduced, the dissolved hydrogen in the continuous phase (diesel oil) is in a supersaturated state and further converted into microbubbles with nanometer-level diameters (as shown in figure 2), and because the diameter is small, the stability of the microbubbles is high, and the microbubbles are generally sealed and stored for 6 months at normal temperature and normal pressure, and the nano hydrogen bubbles are not significantly agglomerated and destroyed.

Disclosure of Invention

The invention provides a continuous preparation method of a nano hydrogen bubble/diesel oil mixed fuel based on the principle that dissolved hydrogen is supersaturated to generate nano-diameter bubbles, an impinging fluid mixing technology and a corrugated pipe intensified mixing technology, and the prepared nano hydrogen bubble/diesel oil mixed fuel can be directly used as diesel oil fuel.

In order to solve the technical problem, the invention provides a preparation device of a hedging mixed nano hydrogen bubble/diesel mixed fuel, which comprises a hydrogen cylinder, a mixer, a buffer, an oil/gas separator and a hydrogen processor, wherein the hydrogen cylinder is connected with the mixer; the mixer comprises a mixer main body, wherein an oil inlet pipe is arranged at the front end of the mixer main body, an oil outlet pipe is arranged at the rear end of the mixer main body, and the inner diameters of the oil inlet pipe and the oil outlet pipe are d; the mixer main body comprises 3-5 stages of mixers which are sequentially connected end to end along the oil inlet pipe and the oil outlet pipe, and each stage of mixer comprises a transition pipe and a mixer which are mutually connected in series; the inner diameter of the transition pipe is D, and the length of the transition pipe is L; the mixer is a stainless steel corrugated pipe with the inner diameter D and the length within the range of 100-400 mm; an air inlet nozzle is arranged at the position of an axis in the transition pipe, and the direction of the air inlet nozzle faces to the oil inlet pipe; a hydrogen pressure reducing valve and a secondary pressure regulator are arranged on a pipeline at the outlet of the hydrogen cylinder, and the maximum output pressure of the hydrogen pressure reducing valve is greater than 3 MPa; the pressure adjusting range of the secondary pressure adjuster is 0-3 MPa; the outlet of the secondary pressure regulator is respectively connected to an air inlet nozzle in the multistage mixer through a plurality of parallel pipelines; the outlet of the oil outlet pipe is connected with the inlet of the buffer through a pipeline, the volume of the buffer is (3-5) x s, and s is the volume of diesel entering the mixer main body from the oil inlet pipe per minute; the volume of the oil/gas separator is 2-5 times of the volume of the buffer; the outlet of the buffer is connected with the inlet of the oil/gas separator, a liquid pressure reducing valve is arranged on a connecting pipeline between the buffer and the oil/gas separator, the oil/gas separator is provided with an oil discharge port and an air outlet, and the air outlet of the oil/gas separator is connected to the hydrogen processor; the hydrogen treatment efficiency of the hydrogen processor was 100%.

Further, in the invention, the mixer main body is a 3-stage mixer, and comprises a first transition pipe, a first mixer, a second transition pipe, a second mixer, a third transition pipe and a third mixer which are sequentially connected end to end; the inner diameters of the first transition pipe, the second transition pipe and the third transition pipe are D, and the lengths of the first transition pipe, the second transition pipe and the third transition pipe are L; the first mixer, the second mixer and the third mixer are all stainless steel corrugated pipes with the inner diameter of D, and the length of the stainless steel corrugated pipes is within the range of 100-400 mm.

The air inlet nozzle is provided with 1-7 air nozzles, and the diameter of each air nozzle is not more than 0.1 mm.

A front flow guide pipe is connected between the oil inlet pipe and the mixer main body, the cone angle is 30-75 degrees, the inner diameter of a small end is D, and the inner diameter of a large end is D.

And a rear guide pipe is connected between the oil outlet pipe and the mixer main body, the taper angle is 30-75 degrees, the inner diameter of the small end is D, and the inner diameter of the large end is D.

d＝10～20mm，D＝20～100mm，L＝20～50mm。

The device for preparing the counter-impact mixed nano hydrogen bubble/diesel mixed fuel comprises a mixer main body of a 3-level mixer, and the preparation method comprises the following steps:

step one, supplying hydrogen to diesel oil flowing through a mixer main body by a hydrogen cylinder through a hydrogen pressure reducing valve, a secondary pressure regulator, an air inlet nozzle in a first transition pipe, an air inlet nozzle in a second transition pipe and an air inlet nozzle in a third transition pipe in sequence at the same preset constant pressure within the range of 0.1-3 MPa; continuously adding diesel oil into the mixer main body from the oil inlet pipe through the front guide pipe and the first transition pipe, wherein the oiling speed is s, and s is (0.1-1) multiplied by the volume/min of the first mixer;

step two, the diesel oil flowing to the first transition pipe pushes the hydrogen provided by the air inlet nozzle in the first transition pipe to enter the first mixer together, and the hydrogen/diesel oil solution are converted into a mixture by intensified mixing under the action of the corrugated pipe wall of the first mixer;

the mixture of the hydrogen and the hydrogen/diesel solution enters a second transition pipe after passing through the first mixer, and pushes the hydrogen provided by an air inlet nozzle in the second transition pipe to enter the second mixer together; under the action of the corrugated pipe wall of the second mixer, the hydrogen and the hydrogen/diesel solution are further mixed intensively;

then, the formed mixture of hydrogen and hydrogen/diesel solution enters a third transition pipe after passing through a second mixer, and pushes hydrogen provided by a third air inlet nozzle to enter a third mixer together; under the action of the corrugated pipe wall of the third mixer, the hydrogen and the hydrogen/diesel solution are further mixed intensively;

the finally formed mixture of the hydrogen and the hydrogen/diesel solution flows to the buffer from the outlet of the third mixer through the rear guide pipe and the oil outlet pipe in sequence;

and step three, the mixture of the hydrogen and the hydrogen/diesel solution which is stabilized in the buffer enters the oil/gas separator for separation after pressure relief through a liquid pressure reducing valve, hydrogen and the nano hydrogen bubble/diesel mixed fuel are obtained, the separated hydrogen is subjected to harmless treatment in a hydrogen processor, and the separated nano hydrogen bubble/diesel mixed fuel is discharged through the oil discharge port.

The nano hydrogen bubble/diesel oil mixed fuel prepared by the method is used as diesel engine fuel.

Compared with the prior art, the invention has the beneficial effects that:

when the nano hydrogen bubble/diesel oil mixed fuel is applied, the diesel engine only needs one set of oil supply system, and the hardware of the oil supply system is not required to be changed; the nano hydrogen bubble/diesel oil mixed fuel for the combustion of the diesel engine can greatly improve the thermal efficiency of the diesel engine, improve the fuel economy and reduce the pollutant emission of the diesel engine; the renewable energy hydrogen is adopted to partially replace fossil fuel diesel, which is beneficial to alleviating the increasingly severe petroleum supply situation of China and ensuring the energy safety of China. In addition, the hydrogen bubbles with nanometer-level diameters can be generated by adopting a supersaturated solution phase separation bubble generation method, so that the combustion performance of the mixed fuel on a diesel engine is improved, and the hydrogen bubbles can stably exist for a long time; the hydrogen/diesel oil mixing and dissolving method based on the counter-impact mixing can strengthen the turbulent mixing of gas/liquid phases, and is beneficial to the full dissolution of hydrogen in diesel oil; the corrugated pipe wall structure of the mixer can further enhance the turbulent mixing of the gas/liquid phases; the three-stage hedging mixing can form a concentration gradient in a hydrogen/diesel solution in a mixing system, so that the dissolution of hydrogen in diesel is further enhanced; the continuous preparation method of the nano hydrogen bubble/diesel mixed fuel can improve the preparation efficiency of the mixed fuel and is more suitable for the industrial production of the nano hydrogen bubble/diesel mixed fuel.

Drawings

FIG. 1 is a schematic diagram of a device for preparing a counter-impact mixed nano hydrogen bubble/diesel oil mixed fuel.

Wherein: 1-hydrogen gas cylinder; 2-a hydrogen pressure reducing valve; 3-a secondary pressure regulator; 4-oil inlet pipe; 5-a front flow guide pipe; 6-a first transition duct; 7-a first air inlet nozzle; 8-a first mixer; 9-a second transition duct; 10-a second air inlet nozzle; 11-a second mixer; 12-a third transition duct; 13-a third air inlet nozzle; 14-a third mixer; 15-rear flow guide pipe; 16-an oil outlet pipe; 17-a buffer; 18-liquid relief valves; 19-oil/gas separator; 20-a hydrogen processor; 21-oil discharge port.

Fig. 2 shows the diameter distribution rule of nano hydrogen bubbles in the nano hydrogen bubble/diesel oil mixed fuel obtained by using the preparation apparatus and the preparation steps described in example 2.

Detailed Description

The technical solution of the present invention is further described below by specific examples in conjunction with the accompanying drawings. It should be noted that the present embodiments are illustrative and not restrictive, and the present invention is not limited to the following embodiments.

Example 1:

the structure of the device for preparing the counter-mixing nano hydrogen bubble/diesel oil mixed fuel is described by taking a mixer as a three-stage mixer and combining with the figure 1.

As shown in fig. 1, the preparation apparatus includes a hydrogen cylinder 1, an oil feed pipe 4, a first mixer 8, a second mixer 11, a third mixer 14, an oil discharge pipe 16, a buffer 17, an oil/gas separator 19, and a hydrogen processor 20.

The pipeline of the outlet of the hydrogen cylinder 1 is provided with a hydrogen pressure reducing valve 2 and a second-stage pressure regulator 3, the outlet of the second-stage pressure regulator 3 is respectively connected to an air inlet nozzle (namely, a first air inlet nozzle 7) in the first transition pipe 6, an air inlet nozzle (namely, a second air inlet nozzle 10) in the second transition pipe 9 and an air inlet nozzle (namely, a third air inlet nozzle 13) in the third transition pipe 12 through three parallel pipelines, the first air inlet nozzle 7, the second air inlet nozzle 10 and the third air inlet nozzle 13 are respectively installed at the axial line positions of the first transition pipe 6, the second transition pipe 9 and the third transition pipe 12, and the installation directions are opposite to the diesel oil flowing direction.

The inner diameter of the oil inlet pipe 4 is 10-20 mm, and the oil inlet pipe is connected with the first transition pipe 6 through a front flow guide pipe 5; the inner diameter of the first transition pipe 6 is 20-100 mm, and the length of the first transition pipe is 20-50 mm; the taper angle of the front flow guide pipe 5 is 30-75 degrees, the inner diameter of a small end is the same as that of the oil inlet pipe 4, the inner diameter of a large end is the same as that of the first transition pipe 6, and the large end is connected with the first transition pipe 6 through welding.

First blender 8 with the exit linkage of first transition pipe 6, first blender 8 is the same stainless steel bellows of internal diameter and the internal diameter of first transition pipe 6, length 100 ~ 400mm, and its exit linkage second transition pipe 9, the internal diameter of second transition pipe 9, length all are the same with the internal diameter of first transition pipe 6, length.

The second mixer 11 with the exit linkage of second transition pipe 9, second mixer 11 is the same stainless steel bellows of internal diameter and the internal diameter of first transition pipe 6, and length 100 ~ 400mm, its exit linkage third transition pipe 12, the internal diameter of third transition pipe 12, length all are the same with the internal diameter of first transition pipe 6, length.

The third mixer 14 is connected with an outlet of the third transition pipe 12, the third mixer 14 is a stainless steel corrugated pipe with the inner diameter being the same as that of the first transition pipe 6, and the length of the third mixer is 100-400 mm.

The inner diameter of the oil outlet pipe 16 is the same as that of the oil inlet pipe 4, the inlet of the oil outlet pipe is connected with the third mixer 14 through the rear guide pipe 15, the taper angle of the rear guide pipe 15 is 30-75 degrees, the inner diameter of the small end is the same as that of the oil outlet pipe 16, and the inner diameter of the large end is the same as that of the third mixer 14; the outlet of the oil outlet pipe 16 is connected to a buffer 17 through a pipeline, the volume of the buffer 17 is (3-5) x s, and s is the volume of diesel oil entering the preparation device from the oil inlet pipe per minute; the outlet of the buffer 17 is connected to the inlet of the oil/gas separator 19, a liquid pressure reducing valve 18 is arranged on a connecting pipeline between the buffer 17 and the oil/gas separator 19, the oil/gas separator 19 is provided with an oil discharge port 21 and an air outlet, and the air outlet of the oil/gas separator 19 is connected to the hydrogen processor 20.

In the embodiment of the invention, the first air inlet nozzle 7 is provided with 1-7 air injection ports, the diameter of each nozzle is the same and not more than 0.1mm, and the number and the diameter of the second air inlet nozzle 10 and the third air inlet nozzle 13 are the same as those of the first air inlet nozzle; the maximum output pressure of the hydrogen pressure reducing valve 2 is greater than 3 MPa; the pressure adjusting range of the secondary pressure adjuster 3 is 0-3 MPa; the hydrogen treatment efficiency of the hydrogen processor 20 is 100%; the volume of the oil/gas separator 19 is 2-5 times of the volume of the buffer 17.

The preparation process of the device for preparing the hedging mixed nano hydrogen bubble/diesel oil mixed fuel mainly comprises the following steps: after pressure reduction and pressure regulation, the hydrogen cylinder supplies hydrogen to the multistage mixer at the same preset constant pressure within the range of 0.1-3 MPa; adding diesel oil into the first mixer at constant speed, mixing into a mixture of hydrogen and hydrogen/diesel oil solution under the action of the corrugated pipe wall of the first mixer, sequentially entering a subsequent mixer for further mixing, entering a buffer, releasing the pressure of the mixture of hydrogen and hydrogen/diesel oil solution stabilized by the buffer, and then entering an oil/gas separator for separation to obtain the nano hydrogen bubble/diesel oil mixed fuel. The method comprises the following specific steps:

firstly, supplying hydrogen to diesel oil flowing through a preparation device by a hydrogen cylinder 1 through a hydrogen pressure reducing valve 2, a secondary pressure regulator 3 and an air inlet nozzle 7 in a first transition pipe 6, an air inlet nozzle 10 in a second transition pipe 9 and an air inlet nozzle 13 in a third transition pipe 12 in sequence at the same preset constant pressure within the range of 0.1-3 MPa; continuously adding diesel oil into the mixer main body from the oil inlet pipe 4 through the front guide pipe 5 and the first transition pipe 6, wherein the oiling speed is s, and s is (0.1-1) multiplied by the volume/min of the first mixer 8;

step two, the diesel oil flowing to the first transition pipe 6 pushes the hydrogen gas provided by the first air inlet nozzle 7 to enter the first mixer 8 together, and the hydrogen gas and the hydrogen/diesel oil solution are converted into a mixture by intensified mixing under the action of the wall of the corrugated pipe; the mixture of hydrogen and hydrogen/diesel solution enters the second transition pipe 9 from the outlet of the first mixer 8 and pushes the hydrogen supplied by the second inlet nozzle 10 into the second mixer 11 together; under the action of the corrugated pipe wall of the second mixer 11, the hydrogen and the hydrogen/diesel solution are further intensively mixed, the formed mixture of the hydrogen and the hydrogen/diesel solution enters the third transition pipe 12 from the outlet of the second mixer 11, and the hydrogen provided by the third air inlet nozzle 13 is pushed to enter the third mixer 14 together; under the action of the corrugated pipe wall of the third mixer 14, the hydrogen and the hydrogen/diesel solution are further intensively mixed, and the formed mixture of the hydrogen and the hydrogen/diesel solution flows from the outlet of the third mixer 14 to the buffer 17 through the rear draft tube 15 and the oil outlet tube 16 in sequence.

And step three, the mixture of the hydrogen and the hydrogen/diesel solution stabilized in the buffer 17 is subjected to pressure relief through a liquid pressure reducing valve 18 and then enters the oil/gas separator 19 to be separated, hydrogen and the nano hydrogen bubble/diesel mixed fuel are obtained, the separated hydrogen is subjected to harmless treatment in a hydrogen processor 20, and the separated nano hydrogen bubble/diesel mixed fuel is discharged through the oil discharge port 21.

Example 2:

on the basis of example 1, D is 10mm, D is 20mm, and L is 20 mm; the first air intake nozzle 7, the second air intake nozzle 10 and the third air intake nozzle 13, which were all 3 holes and had a nozzle diameter of 0.08mm, were selected, and the 3 air intake nozzles were installed in the direction opposite to the diesel flow direction.

Hydrogen is supplied from a hydrogen cylinder 1 through a hydrogen pressure reducing valve 2, a secondary pressure regulator 3, a first air inlet nozzle 7, a second air inlet nozzle 10, and a third air inlet nozzle 13 to diesel oil injected into the mixer body through an oil inlet pipe 4 at a constant pressure of 2 MPa. The first mixer 8, the second mixer 11, and the third mixer 14 each having a length of 100mm were selected. Injecting diesel oil with the flow rate of 0.03L/min from an oil inlet pipe 4 connected to a front flow guide pipe 5 with a cone angle of 45 degrees, wherein the diesel oil injected through the oil inlet pipe 4 flows to a first transition pipe 6 and then pushes hydrogen supplied by a first air inlet nozzle 7 to enter a first mixer 8, and the hydrogen/diesel oil solution are converted into a mixture by intensive mixing under the action of the wall of a corrugated pipe; the mixture of hydrogen and hydrogen/diesel solution enters the second transition pipe 9 from the outlet of the first mixer 8 and pushes the hydrogen supplied by the second inlet nozzle 10 into the second mixer 11 together; under the action of the corrugated pipe wall of the second mixer 11, the hydrogen and the hydrogen/diesel solution are further intensively mixed, the formed mixture of the hydrogen and the hydrogen/diesel solution enters the third transition pipe 12 from the outlet of the second mixer 11, and the hydrogen provided by the third air inlet nozzle 13 is pushed to enter the third mixer 14 together; under the action of the corrugated pipe wall of the third mixer 14, the hydrogen and the hydrogen/diesel solution are further intensively mixed, and the formed mixture of the hydrogen and the hydrogen/diesel solution flows from the outlet of the third mixer 14 to the buffer 17 with the volume of 1.5L through the rear draft tube 15 and the oil outlet tube 16 with the cone angle of 60 degrees. The mixture of the hydrogen and the hydrogen/diesel solution stabilized in the buffer 17 is decompressed by a liquid pressure reducing valve 18 and then enters an oil/gas separator 19 with the volume of 3L for separation to obtain hydrogen and nano hydrogen bubble/diesel mixed fuel, the separated hydrogen is subjected to innocent treatment in a hydrogen processor 20, and the separated nano hydrogen bubble/diesel mixed fuel is discharged through an oil discharge port 21 with the inner diameter of 20 mm.

The diameter distribution of hydrogen bubbles in the nano hydrogen bubble/diesel oil mixed fuel prepared in example 2 was measured using a ZS 90 type nano particle size meter manufactured by marvens corporation, and the results are shown in fig. 2.

Example 3:

on the basis of the embodiment 1, D is 20mm, D is 100mm, and L is 50 mm; the first air intake nozzle 7, the second air intake nozzle 10 and the third air intake nozzle 13, which are all 7 holes and have a nozzle diameter of 0.1mm, were selected, and the 3 air intake nozzles were installed in the direction opposite to the diesel flow direction.

Hydrogen is supplied from a hydrogen cylinder 1 through a hydrogen pressure reducing valve 2, a secondary pressure regulator 3, a first air inlet nozzle 7, a second air inlet nozzle 10, and a third air inlet nozzle 13 to diesel oil injected into the mixer body through an oil inlet pipe 4 at a constant pressure of 3 MPa. The first mixer 8, the second mixer 11 and the third mixer 14 were selected to have lengths of 300mm, 300mm and 400mm, respectively. Injecting diesel oil with the flow rate of 0.5L/min from an oil inlet pipe 4 connected to a front flow guide pipe 5 with a cone angle of 75 degrees, wherein the diesel oil injected through the oil inlet pipe 4 flows to a first transition pipe 6 and then pushes hydrogen supplied by a first air inlet nozzle 7 to enter a first mixer 8 together, and the hydrogen/diesel oil solution are converted into a mixture by intensive mixing under the action of the wall of a corrugated pipe; the mixture of hydrogen and hydrogen/diesel solution enters the second transition pipe 9 from the outlet of the first mixer 8 and pushes the hydrogen supplied by the second inlet nozzle 10 into the second mixer 11 together; under the action of the corrugated pipe wall of the second mixer 11, the hydrogen and the hydrogen/diesel solution are further intensively mixed, the formed mixture of the hydrogen and the hydrogen/diesel solution enters the third transition pipe 12 from the outlet of the second mixer 11, and the hydrogen provided by the third air inlet nozzle 13 is pushed to enter the third mixer 14 together; under the action of the corrugated pipe wall of the third mixer 14, the hydrogen and the hydrogen/diesel solution are further intensively mixed, and the formed mixture of the hydrogen and the hydrogen/diesel solution flows from the outlet of the third mixer 14 to the buffer 17 with the volume of 7.5L through the rear draft tube 15 and the oil outlet tube 16 with the cone angle of 75 degrees. The mixture of the hydrogen and the hydrogen/diesel solution stabilized in the buffer 17 is decompressed by a liquid pressure reducing valve 18 and then enters an oil/gas separator 19 with the volume of 15L for separation to obtain hydrogen and nano hydrogen bubble/diesel mixed fuel, the separated hydrogen is subjected to innocent treatment in a hydrogen processor 20, and the separated nano hydrogen bubble/diesel mixed fuel is discharged through an oil discharge port 21 with the inner diameter of 30 mm.

Example 4:

on the basis of example 1, D is 10mm, D is 20mm, and L is 20 mm; the first air intake nozzle 7, the second air intake nozzle 10 and the third air intake nozzle 13, which are all 1 hole and have a nozzle diameter of 0.1mm, were selected, and the 3 air intake nozzles were installed in the direction opposite to the diesel flow direction.

Hydrogen is supplied from a hydrogen cylinder 1 through a hydrogen pressure reducing valve 2, a secondary pressure regulator 3, a first gas inlet nozzle 7, a second gas inlet nozzle 10, and a third gas inlet nozzle 13 to diesel oil injected into the mixer body through an oil inlet pipe 4, respectively, at a constant pressure of 0.1 MPa. The first mixer 8, the second mixer 11 and the third mixer 14 were selected to have lengths of 400mm, 200mm and 400mm, respectively. Injecting diesel oil with the flow rate of 0.025L/min from an oil inlet pipe 4 connected with a front flow guide pipe 5 with a 30-degree cone angle, wherein the diesel oil injected through the oil inlet pipe 4 flows to a first transition pipe 6 and then pushes hydrogen supplied by a first air inlet nozzle 7 to enter a first mixer 8 together, and the hydrogen/diesel oil solution are converted into a mixture by intensive mixing under the action of the wall of a corrugated pipe; the mixture of hydrogen and hydrogen/diesel solution enters the second transition pipe 9 from the outlet of the first mixer 8 and pushes the hydrogen supplied by the second inlet nozzle 10 into the second mixer 11 together; under the action of the corrugated pipe wall of the second mixer 11, the hydrogen and the hydrogen/diesel solution are further intensively mixed, the formed mixture of the hydrogen and the hydrogen/diesel solution enters the third transition pipe 12 from the outlet of the second mixer 11, and the hydrogen provided by the third air inlet nozzle 13 is pushed to enter the third mixer 14 together; under the action of the corrugated pipe wall of the third mixer 14, the hydrogen and the hydrogen/diesel solution are further intensively mixed, and the formed mixture of the hydrogen and the hydrogen/diesel solution flows from the outlet of the third mixer 14 to the buffer 17 with the volume of 0.6L through the rear draft tube 15 and the oil outlet tube 16 with the cone angle of 45 degrees. The mixture of the hydrogen and the hydrogen/diesel solution stabilized in the buffer 17 is decompressed by a liquid pressure reducing valve 18 and then enters an oil/gas separator 19 with the volume of 3L for separation to obtain hydrogen and nano hydrogen bubble/diesel mixed fuel, the separated hydrogen is subjected to innocent treatment in a hydrogen processor 20, and the separated nano hydrogen bubble/diesel mixed fuel is discharged through an oil discharge port 21 with the inner diameter of 20 mm.

The preparation method can prepare the hydrogen bubble/diesel oil mixed fuel with the hydrogen bubble diameter at the nanometer level and the stable period of more than 6 months, and can be directly used as diesel fuel to replace pure diesel fuel. When the nano hydrogen bubble/diesel oil mixed fuel is combusted, only one set of oil supply system is needed for the diesel engine, and the hardware of the oil supply system is not needed to be adjusted; the nano hydrogen bubble/diesel oil mixed fuel for the diesel engine can greatly improve the economy and the emission performance of the diesel engine. In addition, hydrogen bubbles with nanometer-level diameters can be generated by adopting a supersaturated solution phase separation bubble generation method, so that the combustion performance of the mixed fuel on a diesel engine is improved, and the hydrogen bubbles can stably exist for a long time; the hydrogen/diesel oil mixing and dissolving method based on the counter-impact mixing can strengthen the turbulent mixing of gas/liquid phases, and is beneficial to the full dissolution of hydrogen in diesel oil; the corrugated pipe wall structure of the mixer can further enhance the turbulent mixing of the gas/liquid phases; the three-stage hedging mixing can form a concentration gradient in a hydrogen/diesel solution in a mixing system, so that the dissolution of hydrogen in diesel is further enhanced; the continuous preparation method of the nano hydrogen bubble/diesel mixed fuel can improve the preparation efficiency of the mixed fuel and is more suitable for the industrial production of the nano hydrogen bubble/diesel mixed fuel.

While the present invention has been described with reference to the accompanying drawings, the present invention is not limited to the above-described embodiments, which are illustrative only and not restrictive, and various modifications which do not depart from the spirit of the present invention and which are intended to be covered by the claims of the present invention may be made by those skilled in the art.

Claims

1. A preparation device of a hedging mixed nano hydrogen bubble/diesel oil mixed fuel, which comprises a hydrogen cylinder (1), a mixer, a buffer (17), an oil/gas separator (19) and a hydrogen processor (20); the method is characterized in that:

the mixer comprises a mixer main body, wherein an oil inlet pipe (4) is arranged at the front end of the mixer main body, an oil outlet pipe (16) is arranged at the rear end of the mixer main body, and the inner diameters of the oil inlet pipe (4) and the oil outlet pipe (16) are d; the mixer main body comprises 3-5 stages of mixers which are sequentially connected end to end along the oil inlet pipe (4) to the oil outlet pipe (16), and each stage of mixer comprises a transition pipe and a stainless steel corrugated pipe, wherein the transition pipe and the stainless steel corrugated pipe are mutually connected in series, the inner diameter of the transition pipe is D, and the length of the stainless steel corrugated pipe is within the range of 100-400 mm; the inner diameter of the transition pipe is D, and the length of the transition pipe is L; d = 10-20 mm, D = 20-100 mm, and L = 20-50 mm;

an air inlet nozzle is arranged at the position of an axis in the transition pipe, and the direction of the air inlet nozzle faces to the oil inlet pipe (4); the air inlet nozzle is provided with 1-7 air nozzles, and the diameter of each air nozzle is not more than 0.1 mm;

a hydrogen pressure reducing valve (2) and a secondary pressure regulator (3) are arranged on a pipeline at the outlet of the hydrogen cylinder (1), and the maximum output pressure of the hydrogen pressure reducing valve (2) is greater than 3 MPa; the pressure adjusting range of the secondary pressure adjuster (3) is 0-3 MPa; the outlet of the secondary pressure regulator (3) is respectively connected to an air inlet nozzle in the multistage mixer through a plurality of parallel pipelines;

an outlet of the oil outlet pipe (16) is connected with an inlet of the buffer (17) through a pipeline, the volume of the buffer (17) = (3-5) x s, and s is the volume of diesel entering the mixer main body from the oil inlet pipe (4) per minute; the volume of the oil/gas separator (19) is 2-5 times of that of the buffer (17);

an outlet of the buffer (17) is connected with an inlet of the oil/gas separator (19), a liquid pressure reducing valve (18) is arranged on a connecting pipeline of the buffer (17) and the oil/gas separator (19), the oil/gas separator (19) is provided with an oil discharge port (21) and an air outlet, and the air outlet of the oil/gas separator (19) is connected to the hydrogen processor (20); the hydrogen treatment efficiency of the hydrogen processor (20) is 100%.

2. The apparatus for preparing the convective mixing nano hydrogen bubble/diesel oil mixed fuel according to claim 1, wherein: the mixer main part is 3 grades of blenders, including first transition pipe (6), first blender (8), second transition pipe (9), second blender (11), third transition pipe (12) and third blender (14) of end to end connection in proper order.

3. The apparatus for preparing the convective mixing nano hydrogen bubble/diesel oil mixed fuel according to claim 1, wherein: a front draft tube (5) is connected between the oil inlet tube (4) and the mixer main body, the taper angle is 30-75 degrees, the inner diameter of a small end is D, and the inner diameter of a large end is D.

4. The apparatus for preparing the convective mixing nano hydrogen bubble/diesel oil mixed fuel according to claim 1, wherein: a rear guide pipe (15) is connected between the oil outlet pipe (16) and the mixer main body, the taper angle is 30-75 degrees, the inner diameter of the small end is D, and the inner diameter of the large end is D.

5. A preparation method of a hedging mixed nano hydrogen bubble/diesel mixed fuel is characterized by comprising the following steps: the device for preparing the counter-impact mixed nano hydrogen bubble/diesel mixed fuel according to claim 2 is adopted, and comprises the following steps:

firstly, supplying hydrogen to diesel oil flowing through a mixer main body by a hydrogen cylinder (1) through a hydrogen pressure reducing valve (2), a secondary pressure regulator (3) and an air inlet nozzle in a first transition pipe (6), an air inlet nozzle in a second transition pipe (9) and an air inlet nozzle in a third transition pipe (12) in sequence at the same preset constant pressure within the range of 0.1-3 MPa; continuously adding diesel oil into a cavity of the mixer main body from an oil inlet pipe (4) through a front flow guide pipe (5) and a first transition pipe (6), wherein the oiling speed is s, and s = (0.1-1). times the volume/min of a first mixer (8);

secondly, the diesel oil flowing to the first transition pipe (6) pushes the hydrogen provided by the air inlet nozzle in the first transition pipe (6) to enter the first mixer (8) together, and the hydrogen/diesel oil solution are converted into a mixture by intensified mixing under the action of the corrugated pipe wall of the first mixer (8);

the mixture of the hydrogen and the hydrogen/diesel solution enters a second transition pipe (9) after passing through a first mixer (8), and pushes the hydrogen provided by an air inlet nozzle in the second transition pipe (9) to enter a second mixer (11) together; under the action of the corrugated pipe wall of the second mixer (11), the hydrogen and the hydrogen/diesel solution are further mixed intensively;

then, the formed mixture of hydrogen and hydrogen/diesel solution enters a third transition pipe (12) after passing through a second mixer (11), and pushes hydrogen provided by an air inlet nozzle in the third transition pipe (12) to enter a third mixer (14) together; the hydrogen and the hydrogen/diesel solution are further intensively mixed under the action of the corrugated pipe wall of the third mixer (14);

the finally formed mixture of hydrogen and hydrogen/diesel oil solution flows from the outlet of the third mixer (14) to the buffer (17) through the rear guide pipe (15) and the oil outlet pipe (16) in sequence;

and step three, the mixture of the hydrogen and the hydrogen/diesel solution which is stabilized in the buffer (17) is decompressed by a liquid pressure reducing valve (18) and then enters the oil/gas separator (19) for separation to obtain hydrogen and the nano hydrogen bubble/diesel mixed fuel, the separated hydrogen is subjected to harmless treatment in a hydrogen processor (20), and the separated nano hydrogen bubble/diesel mixed fuel is discharged through the oil discharge port (21).

6. The application of the nano hydrogen bubble/diesel oil mixed fuel is characterized in that: the device for preparing the convective mixing nano hydrogen bubble/diesel oil mixed fuel according to any one of claims 1 to 4, and the nano hydrogen bubble/diesel oil mixed fuel prepared by the preparation method according to claim 5 is used as diesel fuel.