CN103527526A - Efficient adjustable nozzle ejector - Google Patents

Abstract

The invention discloses an efficient adjustable nozzle ejector which comprises a guiding-ejecting gas cavity and a power steam pipe. The guiding-ejecting gas cavity is provided with a guiding-ejecting gas inlet. The power steam pipe is provided with a power steam inlet. A rotating type nozzle is formed in the front portion of the power steam pipe. A suction chamber is arranged behind the rotating type nozzle. A mixing section which is communicated with the suction chamber and the guiding-ejecting gas cavity is arranged behind the suction chamber. A throat tube is arranged behind the mixing section. A dispersing section is arranged behind the throat tube. A mixed gas outlet is formed in the tail end of the dispersing section. The rotating type nozzle comprises a front hole plate layer and a back hole plate layer which can rotate relatively. The area of an air passing hole is adjusted by relative rotating. The efficient adjustable nozzle ejector is reasonable in structure, the throat-face ratio is adjusted manually by rotating the nozzle or automatically, under the condition that working fluid pressure is changed, the working efficiency of the ejector can be effectively improved, and the average ejecting coefficient is improved by about 30 times compared with a common nozzle.

Description

Efficient adjustable nozzle sparger

Technical field

The present invention relates to a kind of nozzle injector, be widely used in the technical fields such as petrochemical industry.

Background technique

Steam jet ejector is that a kind of turbulent diffusion of jet that utilizes mixes 2 fluid streams of different pressures mutually, and causes the fluid machinery of energy interchange.Its working principle is that high-pressure liquid (also claiming working fluid) changes its pressure energy into kinetic force by nozzle, the interruption-forming low pressure area that goes out at nozzle is entrainmented after low-pressure fluid (also citing approvingly jet body) enters people's mixing chamber and is formed single uniform fluid-mixing, and this fluid-mixing is discharged from outside pump after the reduction of speed supercharging of diffusing tube.Because emitter construction is simple, maintenance expenses is few, and to by being taken out medium without strict demand, rate of air sucked in required is large in addition, and range of working pressure is wide, and therefore at home and abroad the field such as petrochemical industry, metallurgy and refrigeration is widely applied.But because the parameters such as factory steam and working flow are unstable, cause a lot of steam jet ejectors cannot reach best service behaviour.Thereby device cannot go into operation or production capacity cannot reach designing requirement, causes a large amount of wastes of the energy and investment.

Steam jet ejector generally consists of nozzle, suction people chamber and diffusing tube 3 parts, and wherein diffusing tube is comprised of mixing section, trunnion and diffuser 3 parts.The factor that affects steam jet ejector service behaviour is mainly decided by emitter construction parameter and operation operating mode.The former mainly comprises that nozzle arrangements, nozzle and diffusing tube Area Ratio, jet expansion are to parameters such as the distance of mixing chamber inlet and diffuser length.

The research of carry out～serial experiment of the people such as Nahdi shows, the ratio of jet coefficient U and mixed-fluid pressure and citation jet body pressure (abbreviation compression ratio) changes with the variation of nozzle and diffusing tube Area Ratio, has the coupling of an optimal area ratio and maximum jet coefficient in all these conditions.The people such as Mastsuo and Nahdi has studied the impact of comparing jet pump operating characteristics of mixing chamber sectional area and the cross-section area of nozzle, and its result of study shows, corresponding to certain Area Ratio, exists the coupling of a maximum jet coefficient and pressure maximum ratio.

Summary of the invention

The object of the present invention is to provide a kind of rational in infrastructure, the efficient adjustable nozzle sparger of favorable working performance.

Technical solution of the present invention is:

A kind of efficient adjustable nozzle sparger, it is characterized in that: comprise be provided with ejection gas entrance ejection gas chamber, be provided with the power steam pipe of power steam entrance, power steam pipe front portion is provided with rotating nozzle, suction chamber is set after rotating nozzle, the mixing section that after suction chamber, setting communicates with suction chamber and ejection gas chamber, trunnion is set after mixing section, diffuser is set after trunnion, diffuser end arranges mixed gas outlet; Two-layer relatively turnable orifice plate before and after described rotating nozzle comprises, by relatively rotating adjustments of gas by the area in hole.

Mixing section flare, and be from front to back gradually thin form; Diffuser flare, and be from front to back gradually thick form.

Gas by nozzle bore meets following relationship:

In formula, w is for solving variable,

F is without sticky variable,

G is viscosity variable,

H is energy source item,

The vector representation form of w, F, G is as follows:

$W=\left\{\begin{array}{c}\mathrm{\ρ}\\ \mathrm{\ρu}\\ \mathrm{\ρv}\\ \mathrm{\ρw}\\ \mathrm{\ρE}\end{array}\right\},F=\left\{\begin{array}{c}\mathrm{\ρv}\\ \mathrm{\ρvu}+p\stackrel{\→}{i}\\ \mathrm{\ρvv}+p\stackrel{\→}{j}\\ \mathrm{\ρvw}+p\stackrel{\text{\→}}{k}\\ \mathrm{\ρvE}+\mathrm{pv}\end{array}\right\},G=\left\{\begin{array}{c}0\\ {\mathrm{\τ}}_{\mathrm{xi}}\\ {\mathrm{\τ}}_{\mathrm{yi}}\\ {\mathrm{\τ}}_{\mathrm{zi}}\\ {\mathrm{\τ}}_{\mathrm{ij}}{v}_j+q\end{array}\right\}$

In formula, | D is fluid density, kg/m ³;

U, v, w are respectively the speed of x, y, z direction, m/s;

E is the total energy of unit fluid, J/kg;

to be the unit vector along x, y, z coordinate axes;

P is pressure, Pa;

for viscous stress tensor;

Q is heat flux, J/ (m ²s).

The present invention is rational in infrastructure, by swivel nozzle, regulates manually or automatically larynx face ratio, is changing under the condition of working fluid pressure, can effectively improve the working efficiency of sparger, and its average jet coefficient improves doubly left and right of 3O than plain nozzle.

Accompanying drawing explanation

Below in conjunction with drawings and Examples, the invention will be further described.

Fig. 1 is the structural representation of one embodiment of the invention.

Fig. 2 is the structural representation (being A portion enlarged view in Fig. 1) of rotating nozzle.

Embodiment

A kind of efficient adjustable nozzle sparger, comprise be provided with ejection gas entrance 1 ejection gas chamber 2, be provided with the power steam pipe 4 of power steam entrance 3, power steam pipe front portion is provided with rotating nozzle 5, suction chamber 6 is set after rotating nozzle, the mixing section 7 that after suction chamber, setting communicates with suction chamber and ejection gas chamber, trunnion 8 is set after mixing section, diffuser 9 is set after trunnion, diffuser end arranges mixed gas outlet 10; Two-layer relatively turnable orifice plate 11,12 before and after described rotating nozzle comprises, by relatively rotating adjustments of gas by the area in hole.

Mixing section flare, and be from front to back gradually thin form; Diffuser flare, and be from front to back gradually thick form.

Gas by nozzle bore meets following relationship:

In formula, w is for solving variable,

F is without sticky variable,

G is viscosity variable,

H is energy source item,

The vector representation form of w, F, G is as follows:

$W=\left\{\begin{array}{c}\mathrm{\ρ}\\ \mathrm{\ρu}\\ \mathrm{\ρv}\\ \mathrm{\ρw}\\ \mathrm{\ρE}\end{array}\right\},F=\left\{\begin{array}{c}\mathrm{\ρv}\\ \mathrm{\ρvu}+p\stackrel{\→}{i}\\ \mathrm{\ρvv}+p\stackrel{\→}{j}\\ \mathrm{\ρvw}+p\stackrel{\text{\→}}{k}\\ \mathrm{\ρvE}+\mathrm{pv}\end{array}\right\},G=\left\{\begin{array}{c}0\\ {\mathrm{\τ}}_{\mathrm{xi}}\\ {\mathrm{\τ}}_{\mathrm{yi}}\\ {\mathrm{\τ}}_{\mathrm{zi}}\\ {\mathrm{\τ}}_{\mathrm{ij}}{v}_j+q\end{array}\right\}$

In formula, | D is fluid density, kg/m ³;

U, v, w are respectively the speed of x, y, z direction, m/s;

E is the total energy of unit fluid, J/kg;

to be the unit vector along x, y, z coordinate axes; P is pressure, Pa;

for viscous stress tensor;

Q is heat flux, J/ (m ²s).

Claims (3)

1. an efficient adjustable nozzle sparger, it is characterized in that: comprise be provided with ejection gas entrance ejection gas chamber, be provided with the power steam pipe of power steam entrance, power steam pipe front portion is provided with rotating nozzle, suction chamber is set after rotating nozzle, the mixing section that after suction chamber, setting communicates with suction chamber and ejection gas chamber, trunnion is set after mixing section, diffuser is set after trunnion, diffuser end arranges mixed gas outlet; Two-layer relatively turnable orifice plate before and after described rotating nozzle comprises, by relatively rotating adjustments of gas by the area in hole.

2. efficient adjustable nozzle sparger according to claim 1, is characterized in that: mixing section flare, and be from front to back gradually thin form; Diffuser flare, and be from front to back gradually thick form.

3. efficient adjustable nozzle sparger according to claim 1 and 2, is characterized in that: the gas by nozzle bore meets following relationship:

In formula, w is for solving variable,

F is without sticky variable,

G is viscosity variable,

H is energy source item,

The vector representation form of w, F, G is as follows:

$W=\left\{\begin{array}{c}\mathrm{\ρ}\\ \mathrm{\ρu}\\ \mathrm{\ρv}\\ \mathrm{\ρw}\\ \mathrm{\ρE}\end{array}\right\},F=\left\{\begin{array}{c}\mathrm{\ρv}\\ \mathrm{\ρvu}+p\stackrel{\→}{i}\\ \mathrm{\ρvv}+p\stackrel{\→}{j}\\ \mathrm{\ρvw}+p\stackrel{\text{\→}}{k}\\ \mathrm{\ρvE}+\mathrm{pv}\end{array}\right\},G=\left\{\begin{array}{c}0\\ {\mathrm{\τ}}_{\mathrm{xi}}\\ {\mathrm{\τ}}_{\mathrm{yi}}\\ {\mathrm{\τ}}_{\mathrm{zi}}\\ {\mathrm{\τ}}_{\mathrm{ij}}{v}_j+q\end{array}\right\}$ In formula, | D is fluid density, kg/m ³;

U, v, w are respectively the speed of x, y, z direction, m/s;

E is the total energy of unit fluid, J/kg;

to be the unit vector along x, y, z coordinate axes;

P is pressure, Pa;

for viscous stress tensor;

Q is heat flux, J/ (m ²s).

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