阅读说明：本技术 一种文丘里旋风除尘器的文氏管 (Venturi tube of venturi cyclone dust collector ) 是由 陈洪一 龚佰勋 黎莉 邓旺明 邓晨 于 2019-11-14 设计创作，主要内容包括：本发明公开一种文丘里旋风除尘器的文氏管,其特征在于：气体依次经过包含相互连接的收缩管前段、收缩管、喉口、扩张管、扩张管后段；所述文氏管后连接旋风除尘器,旋风除尘器后连接引风机；所述的收缩管前段设有法兰,还设有喷淋液进口；所述喷淋液进口为法兰口,喷淋管道从法兰口中心穿过,喷淋管与法兰口之间通过法兰连接,喷嘴通过喷淋管延伸至收缩段正中心位置,喷淋方向与气体流动方向一致；所述扩张管后端设有法兰。本实用型专利中,由于所述喷嘴位于收缩管的正中心处,喷淋方向正对着喉口,喷水均匀,气液混合效果好,有效提高除尘效率；另外,喷淋液进口采用法兰连接的方式,如喷嘴发生故障,方便喷嘴的检修与更换。(The invention discloses a venturi of a venturi cyclone dust collector, which is characterized in that: the gas sequentially passes through a front section of a contraction pipe, the contraction pipe, a throat, an expansion pipe and a rear section of the expansion pipe which are connected with each other; the rear part of the venturi is connected with a cyclone dust collector, and the rear part of the cyclone dust collector is connected with a draught fan; the front section of the contraction pipe is provided with a flange and a spraying liquid inlet; the spraying liquid inlet is a flange opening, the spraying pipeline penetrates through the center of the flange opening, the spraying pipe is connected with the flange opening through the flange, the nozzle extends to the position of the center of the contraction section through the spraying pipe, and the spraying direction is consistent with the gas flowing direction; and a flange is arranged at the rear end of the expansion pipe. In the utility model, the spray nozzle is positioned at the center of the contraction pipe, the spray direction is right opposite to the throat, the water is uniformly sprayed, the gas-liquid mixing effect is good, and the dust removal efficiency is effectively improved; in addition, the spraying liquid inlet adopts a flange connection mode, and if the nozzle breaks down, the nozzle is convenient to overhaul and replace.)

1. A venturi of a venturi cyclone dust collector is characterized in that: the gas sequentially passes through a front section of a contraction pipe, the contraction pipe, a throat pipe, an expansion pipe and a rear section of the expansion pipe which are connected with each other; the rear part of the venturi is connected with a cyclone dust collector, and the rear part of the cyclone dust collector is connected with a draught fan; the front section of the contraction pipe is provided with a flange and a spraying liquid inlet; the spraying liquid inlet is a flange opening, the spraying pipeline penetrates through the center of the flange opening, the spraying pipe is connected with the flange opening through the flange, the nozzle extends to the position of the center of the contraction section through the spraying pipe, and the spraying direction is consistent with the gas flowing direction; and a flange is arranged at the rear end of the expansion pipe.

2. The venturi of a venturi cyclone according to claim 1, wherein a pipe diameter of a junction of the front section of the convergent pipe and the convergent pipe is equal to a pipe diameter of a junction of the diffuser pipe and the rear section of the diffuser pipe.

3. A venturi of a venturi cyclone according to claim 1, wherein a diameter of a pipe where said contraction pipe is connected with said throat pipe is equal to a diameter of a pipe where said throat pipe is connected with said diffuser pipe.

4. The venturi of a venturi cyclone according to claim 1, wherein the diameter of the throat is set according to a desired process operation condition, the diameter of the throat is calculated by a gas flow rate and a velocity of the gas at the throat, and the velocity of the gas at the throat ranges from 40 to 120 m/s.

5. The venturi tube of a venturi cyclone according to claim 1, wherein a contraction angle of the contraction tube is set to 26 °, and a divergence angle of the expansion tube is set to 6 °.

6. The venturi of a venturi cyclone according to claim 1, wherein the length of the front section of the convergent tube is at least 5 times the inner diameter of the front section of the convergent tube, the length of the rear section of the divergent tube is at least 2 times the inner diameter of the rear section of the divergent tube, and the length of the throat tube is 0.3 times the diameter of the throat tube.

7. The venturi of a venturi-type cyclone dust collector as claimed in claim 1, wherein the rear end of the expansion pipe is connected to an air outlet, and the air outlet is connected to a bent pipe to change the direction of the air outlet.

Technical Field

The invention relates to a venturi of a venturi cyclone dust collector, belonging to the field of dust removal devices.

Background

The venturi tube is widely used for gas dust removal and temperature reduction, and generally comprises a contraction tube, a throat tube, a diffusion tube and the like. After the dust-containing gas enters the contraction pipe from the gas inlet pipe, the flow velocity is gradually increased, the pressure energy of the gas flow is gradually converted into kinetic energy, and the gas velocity reaches the maximum at the inlet of the throat pipe. The spraying liquid is uniformly sprayed along the periphery of the throat pipe, and the liquid drops are atomized and accelerated by the high-speed airflow. Sufficient atomization is a basic condition for achieving efficient dust removal.

When the gas viscosity is higher or the dust content is higher, the nozzle can be blocked or abraded in the operation process, and the venturi tube needs to be designed in consideration of the condition of facilitating the nozzle to be overhauled or replaced.

Disclosure of Invention

The invention provides a venturi tube of a venturi cyclone dust collector, which has good dust removal effect.

The venturi of the venturi cyclone dust collector of the invention is characterized in that: the gas sequentially passes through a front section of a contraction pipe, the contraction pipe, a throat pipe, an expansion pipe and a rear section of the expansion pipe which are connected with each other; the rear part of the venturi is connected with a cyclone dust collector, and the rear part of the cyclone dust collector is connected with a draught fan; the front section of the contraction pipe is provided with a flange and a spraying liquid inlet; the spraying liquid inlet is a flange opening, the spraying pipeline penetrates through the center of the flange opening, the spraying pipe is connected with the flange opening through the flange, the nozzle extends to the position of the center of the contraction pipe through the spraying pipe, and the spraying direction is consistent with the gas flowing direction; and a flange is arranged at the rear end of the expansion pipe.

Further, the pipe diameter of the joint of the front section of the shrinkage pipe and the shrinkage pipe is equal to the pipe diameter of the joint of the rear section of the diffusion pipe and the diffusion pipe.

Further, the pipe diameter of the joint of the contraction pipe and the throat pipe is equal to that of the joint of the throat pipe and the diffusion pipe.

Furthermore, the diameter of the throat is set according to the required process operation conditions, the diameter of the throat is calculated according to the gas flow and the speed of the gas at the throat, and the gas speed range at the throat is 40-120 m/s.

Further, the contraction angle of the contraction tube is 26 degrees, and the expansion angle of the expansion tube is 6 degrees.

Further, the length of the front section of the contraction pipe is at least 5 times of the inner diameter of the front section of the contraction pipe, the length of the rear section of the expansion pipe is at least 2 times of the inner diameter of the rear section of the expansion pipe, and the length of the throat pipe is 0.3 times of the diameter of the throat pipe.

Furthermore, the rear section of the expansion pipe is connected with an air outlet, and the air outlet direction of the air outlet can be changed through the connection of the bent pipe.

Furthermore, the venturi tube is made of 304 stainless steel, and the nozzle is made of 316 SS.

Further, the venturi adopts the mode of welding processing.

Further, the venturi operating temperature is not higher than 450 ℃.

The invention has the following effects: because the nozzle is positioned at the center of the contraction pipe, the spraying direction is right opposite to the throat, the water is uniformly sprayed, the gas-liquid mixing effect is good, and the dust removal efficiency is effectively improved; in addition, the spraying liquid inlet adopts a flange connection mode, and if the nozzle breaks down, the nozzle is convenient to overhaul and replace.

Drawings

FIG. 1 is a schematic structural diagram of a venturi cyclone dust collector of the present invention.

The labels in the figure are: 1-front section of a contraction pipe, 2-contraction pipe, 3-throat, 4-diffusion pipe, 5-rear section of the diffusion pipe, 6-elbow, 7-air outlet, 8-inlet of spray liquid, 9-spray pipe and 10-nozzle.

Detailed Description

The technical solution in an embodiment of the present invention will be described below with reference to the drawings in the embodiment of the present invention.

As shown in fig. 1, the present embodiment provides a venturi tube of a venturi cyclone dust collector, which is applied to gas dust removal and temperature reduction, and comprises a front section 1 of a contraction tube, a contraction tube 2, a throat 3, a diffusion tube 4, a rear section 5 of the diffusion tube, and an air outlet 7; the front section 1 of the contraction pipe is provided with a flange, so that equipment is convenient to install and maintain, and the contraction pipe is also provided with a spraying liquid inlet 8, wherein the spraying liquid inlet 8 adopts a flange opening form, so that the maintenance and the replacement of the nozzle 10 are convenient; a flange is arranged at the rear end of the diffusion pipe 4, so that the installation and transportation of equipment are facilitated; the air outlet 7 changes the air outlet direction through a 90-degree elbow 6.

The pipe diameters of the front section 1 and the rear section 5 of the contraction pipe are DN150, the pipe diameter of the throat pipe is DN65, the contraction angle of the contraction section is 26 degrees, and the expansion angle is 6 degrees.

The spray nozzle 10 extends to the right center of the shrinkage pipe 2 through a spray pipeline 9, and the spray direction is consistent with the gas inlet direction; the other end of the spraying pipeline 9 is connected with a pollution-resistant centrifugal pump.

The rear end of the air outlet 7 is connected with a cyclone dust collector, and the rear end of the cyclone dust collector is connected with a draught fan.

And a silica gel gasket is arranged between the spraying pipeline 9 and the spraying liquid inlet 8 flange for sealing treatment.

The venturi is generally made of 304 stainless steel and the nozzle 10 is made of 316SS stainless steel.

The processing mode of the venturi is welding processing.

The operating temperature of the venturi is not higher than 450 ℃.

The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent structures, equivalent processes, or indirect applications of the present invention in other related fields, which are made by using the contents of the present invention and the accompanying drawings, are also included in the scope of the present invention.