CN201172020Y

CN201172020Y - Inner mixing type pneumatic atomizing nozzle with lengthening enlargement segment

Info

Publication number: CN201172020Y
Application number: CNU2007203060156U
Authority: CN
Inventors: 田原宇; 乔英云; 梁鹏; 盖希坤
Original assignee: Shandong University of Science and Technology
Current assignee: Shandong University of Science and Technology
Priority date: 2007-11-23
Filing date: 2007-11-23
Publication date: 2008-12-31
Anticipated expiration: 2017-11-23

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

The internal-mixing pneumatic nozzle that has the expansion segment that extends

One, technical field

The utility model relates to a kind of internal-mixing pneumatic nozzle that has the expansion segment that extends, and belongs to being the improvement that liquid atomizing nozzle was carried out of atomizing medium with gas (vapour) body.

Two, background technology

In reactions such as catalytic cracking, the raw material oil atomization is a key issue.It plays an important role to improving reaction speed and reaction selectivity, minimizing green coke and dry gas; In burning, the atomizing of fuel oil plays an important role to improving efficiency of combustion, reduce to pollute.Especially to feedstock oil heaviness and poor qualityization, the influence of atomizing raw materials is more obvious, and good atomizing raw materials needs good atomizer.Atomizer commonly used at present is the internal-mixing pneumatic nozzle, KH-3 catalysis atomizer as the Chinese Academy of Sciences, the LPC catalysis atomizer of China Petroleum Chemicals Corporation's Luoyang engineering, U.S. Shi Wei company target formula atomizer, the refreshing fiery atomizer in Beijing etc., this class nozzle has made full use of the energy of steam (gas), atomizing oil plant fineness thin (the cold mould experiment of general water-air, quality particle mean size are about about 60 μ m).The nozzle that has has considered that also reaction or the needed mist that burns are rectangular-shaped, but around all considering reaction environment high temperature to the influence of materialization.In recent years, heavy oil, RFCC or burning had become trend, to the selectivity of product, energy-conservation and environmental protection requirement is more and more higher.Original liquid atomizing nozzle can not adapt to this new requirement.At new requirement, utilize new heavy oil atomizing theoretical, design and a kind ofly can make full use of the atomizing medium energy and the efficient liquid atomizer that hot conditions, atomized particle size are thin, particle size distribution is narrow, the rectangular-shaped suitable reaction of mist requires of reaction environment on every side, be the problem of relevant scientific worker's research always.

Three, summary of the invention

The purpose of this utility model just is to avoid the deficiencies in the prior art, and a kind of internal-mixing pneumatic nozzle that has the expansion segment that extends is provided.

The purpose of this utility model realizes like this, is mainly formed by sleeve pipe, cross-current type multiple spot notes vapour jet pipe, oil gas mixing chamber, atomizer, coaxial successively being connected in series of lengthening expansion segment.The design of sleeve pipe entrance has the inlet of feedstock oil, the cross-current type multiple spot is annotated the design of vapour jet pipe the staggered notes vapour aperture of 3～8 rows, it is connected and seals arrival end by boss and sleeve pipe are coaxial, design has identical with first row's notes vapour aperture hole count on the boss, the staggered oiling aperture that vertically collides, the cross-current type multiple spot is annotated the vapour jet pipe and is installed in before the oil gas mixing chamber, atomizer is connected after the oil gas mixing chamber, atomizer is by contraction section, throat and expansion segment constitute, the expansion segment of atomizer connects one section expansion lengthening section again, and the cross sectional shape of atomizer and expansion lengthening section can be circular, annular, pancake.

According to design of the present utility model, can utilize small amount of steam (gas) to annotate the vapour jet pipe and form good space mixing and atomizing from feedstock oil staggered mixing in the oil gas mixing chamber that boss injects at a high speed by the cross-current type multiple spot, at this moment, the contraction section that oil gas after the atomizing enters jet pipe conical head and atomizer forms annular throat and shower nozzle throat attenuates for twice, and through expansion lengthening section and the high temperature heat exchange of reaction environment on every side, the mist of oil temperature raises, can react more fully or burn, improve reaction speed and reaction selectivity, reduce dry gas and green coke, improve efficiency of combustion, reduce and pollute.

Four, description of drawings

Accompanying drawing is a structural representation of the present utility model.

The drawing of accompanying drawing is established bright as follows;

1. sleeve pipe 2. cross-current type multiple spots are annotated vapour jet pipe 3. oily vapour mixing chamber 4. atomizers 5. expansion lengthening sections 6. feedstock oils inlets

Describe in detail according to the concrete structure that has the internal-mixing pneumatic nozzle of the expansion segment that extends provided by the utility model below in conjunction with drawings and Examples.

Five, the specific embodiment

The internal-mixing pneumatic nozzle that has the expansion segment that extends that the utility model proposed is to be formed by sleeve pipe (1), cross-current type multiple spot notes vapour jet pipe (2), oil gas mixing chamber (3), atomizer (4), coaxial successively being connected in series of lengthening expansion segment (5).The design of sleeve pipe (1) entrance has the inlet (6) of feedstock oil, the cross-current type multiple spot is annotated vapour jet pipe (2) design the staggered notes vapour aperture of 3～8 rows, it is connected and seals arrival end by boss and sleeve pipe (1) are coaxial, design has identical with first row's notes vapour aperture hole count on the boss, the staggered oiling aperture that vertically collides, the cross-current type multiple spot is annotated vapour jet pipe (2) and is installed in oil gas mixing chamber (3) before, atomizer (4) is connected oil gas mixing chamber (5) afterwards, atomizer (4) is by contraction section, throat and expansion segment are in series, the expansion segment of atomizer (4) connects one section expansion lengthening section (5) again, and the cross sectional shape of atomizer and expansion lengthening section can be circular, annular, pancake.

Implement the utility model and can realize following advantage: (1) atomizing steam consumption is few, is generally the 2-5% of feedstock oil; (2) mist repeatedly Change, atomized particle size is thin, and narrow distribution range is compared with similar nozzle, and atomizing effect obviously improves; (3) utilize high velocity vapor (gas) to hang down Straight cross-flow atomizing so that the atomizing effect of heavy oil is good, also is applicable to various feedstock oils simultaneously; (4) increased the expansion lengthening section, taken full advantage of Around the hot conditions of reaction environment, improve the mist of oil temperature, be able to carburation by evaporation, granularity is attenuated; (5) optimized nozzle arrangements, Take full advantage of steam energy, mist of oil square cross section can be various shape, is applicable to the needs of differential responses or burning; (6) operating flexibility big, Simple in structure, make easy for installation.

Claims

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.