CN201172020Y - Internal mixing pneumatic atomizing nozzle with extended diverging section - Google Patents

Abstract

The utility model provides an internal mixing type pneumatic atomizing nozzle with an outstretched extension section, which is an improvement on a liquid atomizing nozzle taking gas (steam) as atomizing medium. The internal mixing type pneumatic atomizing nozzle mainly comprises a sleeve, cross flow multiple-point gas injecting jet tubes, an oil gas mixing chamber, an atomizing spray head and the outstretched extension section which are connected in series in sequence; inlets of raw oil are designed in the cavities of the cross flow multiple-point gas injecting jet tubes and the sleeve. By adopting the crisscross mixing and the drawing down twice of the cross flow multiple-point gas injecting jet tubes, the energy of the atomizing medium is fully utilized, the grain size of the liquid spray is thinner, and the distribution of the grain size is narrower, at the same time, the section shape of the spray distance is the same as or similar to the shape needed for reaction, drops after being atomized carries out heat change and evaporation of the high temperature of the surrounding reaction environment through the outstretched extension section, the atomizing grain size is shrunk again, thereby being capable of more fully reacting, and improving the reacting speed and the selectivity.

Description

Internal mixing pneumatic atomizing nozzle with extended diverging section

1. Technical field

The utility model relates to an internal mixing pneumatic atomizing nozzle with an extended expansion section, which belongs to the improvement of the liquid atomizing nozzle with gas (steam) body as the atomizing medium.

2. Background technology

In reactions such as catalytic cracking, the atomization of raw oil is a key issue. It plays an important role in improving reaction speed and reaction selectivity, reducing coke and dry gas; in combustion, fuel atomization plays an important role in improving combustion efficiency and reducing pollution. Especially for heavy and inferior raw material oil, the impact of raw material atomization is more obvious, and good raw material atomization requires excellent atomizing nozzles. At present, the commonly used atomizing nozzles are internal mixing pneumatic atomizing nozzles, such as the KH-3 catalytic atomizing nozzle of the Chinese Academy of Sciences, the LPC catalytic atomizing nozzle of the Luoyang Project of Sinopec Corporation, the target atomizing nozzle of the American Shiwei Company, Beijing Shenhuo atomizing nozzle, etc., this type of nozzle makes full use of the energy of steam (gas), and the fineness of atomized oil is finer (general water-air cold model experiment, the mass average particle size is about 60 μm). Some nozzles also consider the shape of the fog rectangle required for reaction or combustion, but none of them consider the influence of the high temperature of the surrounding reaction environment on the physicochemical properties. In recent years, catalytic cracking or combustion of heavy oil and residual oil has become a trend, and the requirements for product selectivity, energy saving and environmental protection are getting higher and higher. The original liquid atomizing nozzle can no longer meet this new requirement. In response to new requirements, using the new heavy oil atomization theory, design a high-efficiency liquid that can make full use of the energy of the atomization medium and the high-temperature conditions of the surrounding reaction environment, fine atomization particle size, narrow particle size distribution range, and rectangular shape of the fog suitable for the reaction requirements Atomizing nozzles have always been a subject of research by relevant scientific and technological workers.

3. Contents of the invention

The purpose of the utility model is to avoid the deficiencies of the prior art, and provide an internal mixing pneumatic atomizing nozzle with an extended expansion section.

The purpose of this utility model is realized in this way, mainly by sleeve pipe, cross-flow type multi-point steam injection nozzle, oil-gas mixing chamber, atomizing spray nozzle, lengthened expansion section successively coaxially connected in series to form. The casing inlet section is designed with the inlet of raw material oil, and the cross-flow multi-point steam injection nozzle is designed with 3 to 8 rows of staggered steam injection holes, which are coaxially connected with the casing through the boss and close the inlet end. The platform is designed with the same number of small steam injection holes as the first row of small steam injection holes, which are staggered and vertically collided with each other. The cross-flow multi-point steam injection nozzle is installed before the oil-gas mixing chamber, and the atomizing nozzle is connected after the oil-gas mixing chamber. , the atomizing nozzle is composed of a constriction section, a throat and an expansion section, and the expansion section of the atomization nozzle is connected with an expansion extension section, and the cross-sectional shape of the atomization nozzle and the expansion extension section can be circular, circular, or flat.

According to the design of the utility model, a small amount of steam (gas) can be used to pass through the cross-flow multi-point steam injection nozzle and the raw material oil injected at high speed from the boss in the oil-gas mixing chamber to form good spatial mixing and atomization. , the atomized oil and gas enter the conical head of the nozzle and the contraction section of the atomization nozzle to form an annular throat and the throat of the nozzle is thinned twice, and exchange heat with the high temperature of the surrounding reaction environment through the expansion and extension section, and the temperature of the oil mist rises High, can react or burn more fully, increase reaction speed and reaction selectivity, reduce dry gas and coke, improve combustion efficiency, and reduce pollution.

4. Description of drawings

Accompanying drawing is the structural representation of the utility model.

The drawings of the accompanying drawings are set as follows;

1. Sleeve 2. Cross-flow multi-point steam injection nozzle 3. Oil-vapor mixing chamber 4. Atomizing nozzle 5. Expansion and extension section 6. Raw oil inlet

The specific structure of the internal mixing pneumatic atomizing nozzle with extended expansion section provided by the utility model will be described in detail below with reference to the drawings and embodiments.

5. Specific implementation

The internal mixing pneumatic atomizing nozzle with extended expansion section proposed by the utility model is composed of a casing (1), a cross-flow multi-point steam injection nozzle (2), an oil-gas mixing chamber (3), and an atomizing nozzle. (4), lengthened expansion section (5) are connected in series coaxially successively and form. The inlet section of casing (1) is designed with feed oil inlet (6), and the cross-flow multi-point steam injection nozzle (2) is designed with 3 to 8 rows of staggered steam injection holes, which pass through the boss and the casing. (1) Coaxially connect and close the inlet end, the boss is designed with the same number of small steam injection holes as the first row of small steam injection holes, staggered and vertically collided with each other, and the cross-flow multi-point steam injection nozzle (2) is installed Before the oil-gas mixing chamber (3), the atomizing nozzle (4) is connected after the oil-gas mixing chamber (5). The expansion section connects a section of expansion extension section (5) again, and the cross-sectional shape of atomizing nozzle and expansion extension section can be circular, annular, flat shape.

Implementing the utility model can realize the following advantages: (1) the amount of atomized steam is less, usually 2-5% of the raw oil; The atomization effect is significantly improved; (3) The use of high-speed steam (gas) vertical cross-flow atomization makes the atomization effect of heavy oil better, and it is also suitable for various raw material oils; The high temperature conditions of the surrounding reaction environment are used to increase the temperature of the oil mist, so that it can be evaporated and vaporized, and the particle size is thinned again; (5) The nozzle structure is optimized, and the steam energy is fully utilized. The oil mist moment cross section can be in various shapes, suitable for Different reactions or combustion needs; (6) Large operating flexibility, simple structure, and convenient manufacturing and installation.

Claims (3)

1, the internal-mixing pneumatic nozzle that has the expansion segment that extends is characterized in that being annotated vapour jet pipe, oil gas mixing chamber, atomizer and coaxial successively being connected in series of expansion lengthening section and being formed by sleeve pipe, cross-current type multiple spot, and the inlet of feedstock oil is arranged in the design of sleeve pipe entrance.

2, atomizer according to claim 1 is characterized in that atomizer (3) is connected and constituted by contraction section, throat, expansion segment, and expansion lengthening section (4) is connected after the atomizer expansion segment smoothly.

3, atomizer according to claim 1 is characterized in that the cross sectional shape of atomizer (3) and expansion lengthening section (4) can circle, pancake, fan-shaped, annular.

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