CN101773796A - Method for emulsifying tri-component emulsion containing diesel, methanol and water - Google Patents

Abstract

The invention discloses a three-component emulsion emulsification method of diesel oil, methanol and water. The diesel oil to be emulsified is introduced into the Venturi tube from the inlet section of the Venturi tube. The pressure of the diesel oil before entering the Venturi tube is greater than 0.48MPa, and It flows through the constriction section of the Venturi tube to the throat, and then flows to the diffusion section; methanol and water are mixed in a ratio of 1:1 to 1:2 and the total mass content is controlled between 1% and 3%. Aqueous solution, the pressure of the aqueous methanol solution before entering the Venturi tube is greater than 0.18MPa, introduced into the Venturi tube from the throat of the Venturi tube, and mixed with the diesel oil flowing through the place, the mass flow ratio of diesel oil and methanol aqueous solution is 9:1～ 1:1 mixing to form an emulsion, and finally flow out through the diffusion section. The invention can quickly and evenly disperse the methanol aqueous solution into the diesel oil in a short time, avoiding the uneven phenomenon of local emulsification, thereby reducing the unfavorable factors of demulsification. Extend the shelf life of the emulsion.

Description

A kind of emulsification method of three-component emulsion of diesel oil, methanol and water

technical field

The invention relates to an emulsification method, in particular to an emulsification method using a Venturi tube to form a three-component emulsion of diesel oil, methanol and water.

Background technique

The problem of liquid emulsification is not only closely related to life, but also widely used in industrial and agricultural production, such as the preparation of pesticides, crude oil extraction, medicine, energy and other fields. As an alternative fuel technology, emulsion has the advantages of energy saving, high combustion efficiency, and obvious reduction of exhaust pollution.

When the methanol/water content is low, it is a water-in-oil-O/W emulsion, the dispersed phase is the "water" phase (water or a mixture of alcohol and water), and the continuous phase is "oil" . Compared with oil/water emulsions, diesel oil, methanol and water emulsions have higher energy densities. In addition to the advantages of low flash point temperatures, they can also eliminate icing when used at low temperatures. Since alcohol is an oxygen-containing fuel, diesel engines fueled with methanol, water and diesel emulsion can significantly reduce smoke, and the maximum smoke reduction value can reach about 50%.

At present, the commonly used high-speed stirring and emulsifying equipment has a high mechanical speed, consumes a lot of power, and works intermittently. The amount of emulsification at one time is small. Due to the limitation of the emulsification method, the emulsification work needs to be completed in a special emulsification station, and then the emulsified fuel is provided to the fuel oil equipment. . Moreover, the emulsification device has defects such as complex structure, high maintenance cost and unsatisfactory emulsification effect. The emulsification equipment involved in the invention has the advantages of simple structure, convenient operation and maintenance, large processing capacity, good emulsification effect and the like.

Contents of the invention

According to the defects of the current emulsification device, the present invention proposes a novel emulsification device. The device utilizes the Venturi tube principle to emulsify diesel, methanol and water. Described Venturi tube comprises inlet section, constriction section, throat, diffusion section and outlet section, and inlet section is connected with diesel oil inlet pipeline, and diffusion section is connected with outlet section, and methyl alcohol and water ( Methanol solution) inlet;

The diesel oil to be emulsified is introduced into the Venturi tube from the inlet section of the Venturi tube, the pressure of the diesel oil before entering the Venturi tube is greater than 0.48MPa, and flows through the constriction section of the Venturi tube to the throat, and then flows to the diffusion section; the methanol The methanol aqueous solution formed by mixing the emulsifier with water in a ratio of 1:1 to 1:2 and the total mass content controlled between 1% and 3%. The pressure of the methanol aqueous solution before entering the Venturi tube is greater than 0.18Mpa. The throat of the inner tube is introduced into the Venturi tube and mixed with the diesel oil flowing through it. The diesel oil and methanol aqueous solution are mixed at a mass flow ratio of 9:1 to 1:1 to form an emulsion, and finally flow out through the diffusion section.

Emulsifier refers to the mixture of Span and Tween.

The emulsification method involved in the present invention is different from the traditional emulsification method. In the present invention, the methanol aqueous solution is continuously and uniformly added to the continuously flowing diesel oil to obtain an emulsion. This process is a dynamic process of quantitatively emulsifying the diesel oil and the methanol aqueous solution in proportion, and the methanol aqueous solution can be quickly and uniformly dispersed in a short period of time. In diesel oil, avoid partial emulsification unevenness, thereby reducing the unfavorable factors of demulsification and prolonging the shelf life of the emulsion.

Description of drawings

Fig. 1 is the working principle schematic diagram of the present invention

Fig. 2 is the technological process schematic diagram that utilizes the present invention to produce emulsion

The labels in the figure respectively represent: 1, 3 material pump; 2, diesel pipeline; 4, regulating valve; 5, methanol aqueous solution inlet; 6, Venturi tube; 7, pipeline; 8, material cylinder (diesel); 9 , material cylinder (methanol aqueous solution); 10, finished product cylinder

Detailed ways

Referring to the accompanying drawings, the Venturi tube shown in Figure 1 is a classic Venturi tube, including an inlet section A, a constriction section B, a throat C, a diffusion section D and an outlet section E, and the inlet section A and the diesel pipe The road 2 is connected, the diffusion section D is connected with the outlet section E, and the throat C is connected with the pipeline 7. A material pump 1 is provided in the diesel pipeline 2 , and a material pump 3 and a regulating valve 4 are provided in the pipeline 7 . Fig. 2 is a schematic diagram of the technological process for producing the emulsion, including material pumps 1 and 3, regulating valve 4, Venturi tube 6, material cylinder (diesel) 8, material cylinder (methanol aqueous solution) 9, finished product cylinder 10 and connecting parts The pipeline, wherein the material cylinder (diesel) 8, the material pump 1 and the inlet section A of the Venturi tube 6 are connected sequentially through the pipeline, and the material cylinder (methanol water solution) 9, the material pump 3, the regulating valve 4 and the Venturi tube 6 The throat C is connected in sequence through pipelines, and the finished cylinder 10 is connected with the outlet section E of the Venturi tube 6 through pipelines.

The invention provides an emulsification method, which is a dynamic emulsification method for obtaining emulsified fuel by adding methanol aqueous solution quantitatively, uniformly and continuously to continuously flowing diesel oil, wherein a Venturi tube 6-way diesel oil is mainly used Add methanol aqueous solution to form emulsified fuel. The Venturi tube shown in Figure 1 is a classic Venturi tube, including an inlet section A, a constriction section B, a throat C, a diffusion section D, and an outlet section E. The inlet section A is connected to the diesel pipeline 2, and the diffusion section D is connected to exit section E. An inlet 5 for aqueous methanol is provided at the throat of the Venturi tube, and the inlet for aqueous methanol is connected to a pipeline 7 . The operation steps of the emulsification method of the present invention are as follows: methanol and water are mixed according to the ratio required for preparation and then injected into the material cylinder 9, and the valve 4 is in a closed state at this time. Then the diesel oil is introduced into the Venturi tube from the inlet section A of the Venturi tube by the material pump 1, and flows through the constriction section B of the Venturi tube to reach the throat C, and then flows to the diffusion section D; when the diesel oil flows out of the Venturi tube, and After forming a high-speed and negative pressure zone at the throat, turn on the material pump 3, and introduce methanol aqueous solution from the throat of the Venturi tube into the Venturi tube, contact with the high-speed diesel oil flowing to the diffusion section, and form rapid impact and mixing according to the Venturi principle , to emulsify diesel oil, methanol and water, and flow through the diffusion section D, and finally enter the outlet section E to obtain a three-component emulsion of diesel oil, methanol and water.

According to the method of the present invention, the pressure of diesel oil before entering the Venturi tube should be controlled to be greater than 0.48MPa, preferably 0.48Mpa～0.58Mpa, and the pressure of methanol aqueous solution before entering the Venturi tube should be controlled to be greater than 0.18Mpa, preferably 0.18Mpa～0.6 Mpa, within the range of the above parameters, the rapid and uniform mixing of diesel oil and methanol aqueous solution can be effectively realized.

In the present invention, the ratio and flow of methanol to water can be appropriately adjusted. The present invention optimizes the mass ratio of methanol to water and the mass ratio of diesel oil to methanol aqueous solution: that is, the mass ratio of diesel oil to methanol aqueous solution is controlled to mix within the range of 9:1 to 1:1; the mass ratio of methanol to water should be controlled at 1 : between 1 and 1:2. At the same time, the content of emulsifier should be controlled between 1% and 3%.

Embodiment 1: produce diesel oil, methyl alcohol and water three-component emulsion

This example is to utilize the emulsion preparation method of the present invention to produce a kind of three-phase emulsion fuel of diesel oil, methanol and water. The preparation scheme of this emulsified fuel is as follows:

The mass fraction of diesel oil is about 70%, and the mass fraction of methanol aqueous solution is about 29%. The velocity of the diesel oil at the inlet section of the Venturi tube is 10m/s, the throat velocity is 40m/s, and the mass flow rate is 10.048kg/s (36.17t/h); the methanol aqueous solution inlet velocity is 34.88m/s, and the mass flow rate is 4.29 kg/s (15.4t/h). The content of emulsifier is about 1%.

The specific process flow is shown in FIG. 2 .

Preparation:

Introduce diesel oil into material tank 8; prepare methanol aqueous solution (1:1), then add an appropriate amount of emulsifier, stir until uniform, introduce into material tank 9, and set aside.

Production Process:

Turn on the material pump 1. When the pressure of the emulsified diesel oil entering the Venturi tube is about 0.5Mpa, introduce the diesel oil into the Venturi tube 6. When the diesel oil flows out of the Venturi outlet tube, and after the high-speed and negative pressure zone is formed in the throat , open the material pump 3, the methanol aqueous solution is introduced into the throat 5 of the Venturi tube, the pressure of the methanol aqueous solution before entering the Venturi tube is about 0.5Mpa, and the flow regulating valve 4 is utilized to regulate the flow rate of the methanol aqueous solution to contain methanol, In terms of the total weight percentage of the emulsion of water and diesel oil, the mass fraction when the methanol aqueous solution passes through the throat is about 30%. Into the finished product cylinder 10. In this process, the flow ratio of diesel oil and methanol aqueous solution should be controlled, and after the diesel oil forms a flow in the venturi tube and an accelerated airflow is formed in the throat, the material pump 3 is turned on, and the methanol aqueous solution is introduced into the throat 5 of the venturi tube. The high-speed diesel oil flowing to the diffusion section contacts, forms rapid impact and mixing according to the Venturi principle, emulsifies diesel oil, methanol and water, flows through the diffusion section D, and finally enters the outlet section E to obtain a three-component emulsion of diesel oil, methanol and water . As a result of the emulsification method, the emulsified fuel can be mixed and emulsified uniformly, the particle size distribution is uniform, and the stability is good.

Claims (2)

1. a diesel oil, first alcohol and water method for emulsifying tri-component emulsion containing, it is characterized in that, the diesel oil for the treatment of emulsification is introduced this Venturi tube from the entrance of Venturi tube, diesel oil enters the preceding pressure of Venturi tube greater than 0.48MPa, and the contraction section of the Venturi tube of flowing through arrival throat, flow to diffuser again; The first alcohol and water is controlled at the methanol aqueous solution that forms after the emulsifier between 1%～3% with 1: 1～1: 2 ratio and gross mass content, the pressure of this methanol aqueous solution before entering Venturi tube is greater than 0.18Mpa, introduce in the Venturi tube from Venturi tube throat, and mix with the diesel oil at this place that flows through, diesel oil mixes with 9: 1～1: 1 ratio of mass flow ratio with methanol aqueous solution, form emulsion, after the diffuser outflow.

2. diesel oil according to claim 1, first alcohol and water method for emulsifying tri-component emulsion containing is characterized in that, emulsifying agent is meant the mixed liquor of Span of class of department and tween Tween.

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