阅读说明：本技术 一种消除旋风分离器灰斗中粉尘返混的装置与方法 (Device and method for eliminating dust back mixing in ash bucket of cyclone separator ) 是由 张攀 陈光辉 王伟文 李建隆 于 2019-09-30 设计创作，主要内容包括：本发明公开了一种消除旋风分离器灰斗中粉尘返混的装置与方法,属于非均相分离和环保领域。将导流管设置在分离器中心并插入灰仓中,灰仓中的气体被直接引出分离器或重新引入分离器入口,不仅彻底消除了灰斗中粉尘颗粒的返混的问题,还可以有效地减低分离器中气体旋进涡核的进动幅值,减轻了气流对分离器壁面上颗粒的扰动。本发明中,含尘气体进入分离器后,粉尘颗粒依靠离心力与气流分离,粉尘被推向壁面,并跟随气流一起进入圆锥筒体；绝大部分净化后的气流反向从排气管排出分离器,部分气流继续携带粉尘颗粒进入灰斗；大部分粉尘颗粒沉积在灰斗底部,少部分粉尘颗粒跟随进入灰斗中的气体进入中心引流管；中心引流管中的气体重新引入分离器入口重新分离。分离器系统的切割粒径达到0.8μm,总分离效率达到99.1％。本发明提出的转置和方法可以彻底避免了灰仓中粉尘颗粒的返混,同时降低了中心气体旋进涡的进动幅值,大幅提高了分离器的分离效率,降低了切割粒径,同时没有二次污染问题。(The invention discloses a device and a method for eliminating dust back mixing in an ash bucket of a cyclone separator, belonging to the field of heterogeneous separation and environmental protection. The guide pipe is arranged in the center of the separator and inserted into the ash bin, and the gas in the ash bin is directly led out of the separator or is led into the inlet of the separator again, so that the problem of back mixing of dust particles in the ash bucket is thoroughly solved, the precession amplitude of the gas in the separator which swirls into a vortex core can be effectively reduced, and the disturbance of the gas flow to the particles on the wall surface of the separator is reduced. In the invention, after dust-containing gas enters a separator, dust particles are separated from gas flow by virtue of centrifugal force, and dust is pushed to a wall surface and enters a conical cylinder along with the gas flow; most of the purified air flow is reversely discharged out of the separator from the exhaust pipe, and part of the air flow continuously carries dust particles into the ash bucket; most of dust particles are deposited at the bottom of the ash bucket, and a small part of dust particles enter the central drainage tube along with the gas entering the ash bucket; the gas in the central draft tube is reintroduced into the inlet of the separator for re-separation. The cutting particle size of the separator system reaches 0.8 mu m, and the total separation efficiency reaches 99.1 percent. The transposition and the method provided by the invention can thoroughly avoid the back mixing of dust particles in the ash bin, simultaneously reduce the precession amplitude of the central gas precession vortex, greatly improve the separation efficiency of the separator, reduce the cutting particle size and simultaneously have no secondary pollution problem.)

1. The utility model provides a device that dust backmixing in elimination cyclone ash bucket, includes separator main part, central drainage tube and back flow, central drainage tube is followed the blast pipe of separator main part stretches into in the ash bin of separator, central drainage tube is in one end in the ash bin of separator is provided with gas inlet and fine dust entry, the other end setting of central drainage tube is in the blast pipe export of separator, the export of central drainage tube is connected to through the back flow the intake pipe of separator main part.

2. An arrangement for eliminating dust back-mixing in a cyclone dust hopper according to claim 1, characterized in that the central draft tube 4 is installed centrally from the separator body.

3. An arrangement for eliminating dust back-mixing in a cyclone dust hopper according to claim 1, characterized in that the central draft tube 4 is connected to the separator dust bin and the separator exhaust duct by supports evenly distributed in the circumferential direction.

4. The apparatus as claimed in claim 1, wherein the diameter of the central draft tube 4 is 5-20% of the diameter of the exhaust duct 5 of the cyclone.

5. The apparatus as claimed in claim 1, wherein the height of the central draft tube 4 is 110-150% of the height of the main body of the cyclone separator.

6. The device for eliminating the back mixing of dust in the ash bucket of the cyclone separator as claimed in claim 1, wherein the length of the central draft tube 4 inserted into the ash bin 3 of the cyclone separator is 5-50% of the height of the ash bin 3 of the cyclone separator.

7. The device for eliminating the dust back mixing in the ash bucket of the cyclone separator as claimed in claim 1, wherein the central draft tube 4 is welded with the exhaust tube 5 through a bracket; the central draft tube 4 is connected with the separator ash bin 3 through a support in a welding mode.

8. A method for eliminating dust back mixing in an ash bucket of a cyclone separator is characterized by comprising the following steps: dust particles in the dust-containing gas are separated from the gas flow by virtue of centrifugal force and then carried with part of the gas flow to enter a dust hopper of the separator, most of the dust particles are deposited at the bottom of the dust hopper, and a small part of the dust particles enter the central drainage tube along with the gas entering the dust hopper; the gas flow and dust entering the central draft tube is reintroduced into the separator inlet through the return tube.

Technical Field

The invention discloses a device and a method for eliminating dust back mixing in an ash bucket of a cyclone separator, belonging to the field of heterogeneous separation and environmental protection.

Background

The cyclone separator is important process equipment for gas-solid separation in the fields of new energy, chemical industry, environmental protection and the like, and can effectively recover particle materials and reduce particle emission. The separation efficiency of the separator has an important influence on the safe and smooth operation of various processes and the control of environmental quality. The cyclone separator generates rotary motion by tangentially entering the separator through dust-containing gas, the centrifugal force is used for throwing the dust of the dispersed phase to the wall surface, the gas which moves downwards near the wall surface brings the separated dust particles to the separator cone body, and the dust enters the dust bin to be collected. However, the gas entering the ash bin carries a part of dust, especially fine dust, back into the separator body, so that dust back mixing is formed, and the separation efficiency is reduced. Therefore, the search for effective means and methods to suppress dust back-mixing is crucial to improving separation efficiency.

Patent application No. CN201720391322.2 discloses a water bath formula prevents dust fall and mixes multitube whirlwind ultra-purification dust collector backward, and this dust remover body comprises that the multitube whirlwind is parallelly connected, is connected with public ash storehouse water bath entrapment room in dust remover body below, and the granule gets into behind the ash storehouse by the water bath entrapment, can prevent effectively that the dust fall from mixing backward, but forms the mortar in the dust gets into the water bath and will lead to secondary pollution, bring secondary purification scheduling problem.

Patent application No. CN10427014A discloses a straight-tube type cyclone separator designed for high inlet particle concentration, which mainly consists of a rectangular inlet tube, an outlet tube and a discharge tube. After the airflow containing high-concentration particles enters the cyclone separation area, after the separated particles are subjected to free settling, part of the particles form a particle pile with a certain gradient in the stacking section, and the rest of the particles are discharged from the discharge port. The straight cylinder type cyclone separator can prevent air flow from entering the dust exhaust port through controlling the size of the discharge port, avoids the back mixing of partial particles near the discharge port, but the unstable rotary air flow can generate strong sweeping effect on an open particle material pile, and the back mixing of the particles is more difficult to control.

Patent application numbers CN102039226A and CN201120094524.4 both disclose a cyclone with prevent back mixing awl, prevent back mixing awl in cyclone ash bucket entrance installation, it changes the ascending flow pattern of traditional cyclone ash bucket air current center into the ascending flow pattern of peripheral ring row around preventing back mixing awl, thereby can increase the separating power of granule or liquid droplet in preventing back mixing awl peripheral annular space, reduce the back mixing of granule or liquid droplet in the ash bucket and smuggle secretly, reach the purpose that improves separation efficiency. Although this approach reduces particle backmixing by reducing the axial velocity of the air flow in the ash silo, it is difficult to avoid particle backmixing entrainment at all.

Patent application No. CN101391239 discloses a multi-effect cyclone separator. The separator consists of a primary pre-separation spiral pipe, a secondary pre-separation spiral pipe and a main body consisting of an upper cylinder, a spiral top cover plate and a lower inverted cone cylinder. The dust-containing gas enters the upper cylinder of the separator through the pre-separation spiral pipe and moves downwards in a spiral manner, most of the fluid on the inner side returns upwards to form an inner spiral flow under the action of the throttling flow-stabilizing cone, and the inner spiral flow is discharged through an exhaust port; a small amount of outside gas carries particles separated to the vicinity of the wall surface to enter the ash bin through an annular gap between the throttling flow-stabilizing cone and the cylinder body and through the lower inverted cone cylinder body. The patent envisages: in the ash bin, gas which dispersedly flows towards the edge is separated from dust particles which are downward due to inertia, enters the outer side of the top cover plate, is converged to the central suction pipe through four backflow branch pipes, and returns to the lower inverted cone cylinder again to eliminate ash ring entrainment. However, the airflow velocity in the ash bin is low, it is very difficult to separate the gas from the dust, and the dust is liable to re-enter the inner vortex through the suction/return pipe, resulting in a reduction in separation efficiency.

Therefore, the research on the method for inhibiting the dust back mixing and improving the separation efficiency of the separator still remains the problem to be solved by those skilled in the art at the present stage.

Disclosure of Invention

The invention aims to provide a device and a method for eliminating dust back mixing in an ash hopper of a cyclone separator.

In order to achieve the purpose, the invention provides the following technical scheme:

in a first aspect, the present invention provides a device for eliminating dust back-mixing in an ash hopper of a cyclone separator, comprising: at least one cylindrical barrel 1; at least one inverted cone cylinder 2; at least one ash bin 3; at least one exhaust pipe 5; at least one return pipe 6; at least one air inlet pipe 7; the cylindrical cylinder 1, the inverted conical cylinder 2, the exhaust pipe 5 and the air inlet pipe 7 form a separator main body; the cylindrical barrel 1, the inverted conical barrel 2 and the ash bin 3 are sequentially connected; the air inlet pipe 7 is arranged above the side edge of the cylindrical barrel 1; the exhaust pipe 5 is inserted from the right above the cylindrical barrel 1; at least one central flow-guide tube 4; one end of the central draft tube 4 is arranged below the inlet of the ash bucket, and the other end of the central draft tube is arranged at the outlet of the exhaust pipe.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a schematic view of a cyclone separator apparatus for eliminating dust back mixing in an ash hopper according to the present invention;

FIG. 2 is a schematic view of a cyclone separator apparatus without a central draft tube and return tube for dust back mixing elimination;

wherein: 1- -cylindrical barrel; 2- -inverted cone cylinder; 3- -ash bin; 4- -central drainage tube; 5- -exhaust pipe; 6-a return pipe; 7- -air inlet pipe.

Detailed Description

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

The present invention is described in further detail below with reference to the following examples of the drawings, but it should be understood that the scope of the present invention is not limited to the specific embodiments.

The technical details of the present invention are explained in detail by the following examples.

The separation efficiency is the mass of dust particles captured by the ash bin/mass of dust particles flowing into the separator x 100%.