CN112325565A

CN112325565A - Post-plating aerial fog cooling device and method

Info

Publication number: CN112325565A
Application number: CN202011322551.1A
Authority: CN
Inventors: 丘全科; 王之琳; 杨柏松; 雍海泉; 德军
Original assignee: CISDI Technology Research Center Co Ltd; Chongqing CISDI Thermal and Environmental Engineering Co Ltd
Current assignee: CISDI Technology Research Center Co Ltd; Chongqing CISDI Thermal and Environmental Engineering Co Ltd
Priority date: 2020-11-23
Filing date: 2020-11-23
Publication date: 2021-02-05

Abstract

The invention relates to a post-plating aerial fog cooling device and a post-plating aerial fog cooling method, and belongs to the technical field of continuous annealing treatment. Comprises an aerosol adding section, an expansion section, a stable transition section, a ventilation pipe and a nozzle which are sequentially connected in a through way according to the aerosol flowing direction; the aerosol adding section is communicated with an outlet pipeline of the fan to introduce air, and atomizing nozzles are uniformly distributed in the aerosol adding section along the circumferential direction to spray mist drops; the inside of aerial fog interpolation section, expansion section and smooth changeover portion sets up the gauze respectively on the plane of perpendicular to aerial fog flow direction, and the atomizing nozzle that aerial fog interpolation section inside set up is preceding at its gauze. The design of multilayer gauze, even aerial fog, atomizing liquid drop to improve aerial fog cooling efficiency and homogeneity, and be favorable to device miniaturization, compactification.

Description

Post-plating aerial fog cooling device and method

Technical Field

The invention belongs to the technical field of continuous annealing treatment, and relates to a post-plating aerial fog cooling device and a post-plating aerial fog cooling method.

Background

With the gradual popularization of aluminum-zinc plated and zinc-aluminum magnesium plated products, the requirement on the cooling speed after plating is higher and higher. The cooling speed after plating is an important parameter, which has great influence on the product quality, and the cooling speed requirements of different products are different. Among three modes of gas mist cooling, gas jet cooling and water cooling, the gas mist cooling is popularized due to good cooling speed and cooling stability, and is particularly outside the field of steel. However, in the cooling field after the continuous annealing plating of the strip steel, the cooling after the continuous annealing plating of the strip steel has the characteristics of itself, the aerosol cooling device used in other fields is directly enlarged, and the good aerosol cooling effect in the cooling field after the continuous annealing plating of the strip steel is difficult to realize. Because the strip steel is wider and contains a high amount of heat, the gas fog cooling device needs to have enough spraying capacity and a large number of atomizing nozzles, the problems of nonuniform gas fog distribution and the like easily occur due to the influence of factors such as nozzle installation errors, flow distribution and the like, the device is relatively complex, the linkage degree between the devices is overhigh, and the safety and the reliability of the device are reduced.

In the prior art, the influence of a single atomizing nozzle on the overall device is reduced by adding mist drops into an air box or a header pipe based on a humidifying principle, but the conventional method has some inherent problems, such as low utilization rate of the atomized liquid drops, coalescence and growth of the atomized liquid drops and the like, which cause the reduction of the cooling efficiency and the reduction of the uniformity of the mist.

Disclosure of Invention

In view of the above, the present invention provides a post-plating aerosol cooling device and method, so as to solve the problems that the aerosol cooling efficiency is affected due to low utilization rate of the aerosol droplets, and the aerosol cooling uniformity is reduced due to the coalescence and growth of the aerosol droplets.

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

a spray cooling device after plating comprises a spray adding section, an expansion section, a stable transition section, a ventilation pipe and a nozzle which are sequentially connected in a through manner according to the flow direction of the spray; the aerosol adding section is communicated with an outlet pipeline of the fan to introduce air, and atomizing nozzles are uniformly distributed in the aerosol adding section along the circumferential direction to spray mist drops; the inside of aerial fog interpolation section, expansion section and smooth changeover portion sets up the gauze respectively on the plane of perpendicular to aerial fog flow direction, and the atomizing nozzle that aerial fog interpolation section inside set up is preceding at its gauze.

Furthermore, one of the gauze of the aerosol adding section is a first gauze and is arranged at the middle and rear position of the aerosol adding section in the aerosol flowing direction, and the mesh number of the gauze is 120-200 meshes.

Furthermore, the two gauze screens of the expansion section are a second gauze screen and a third gauze screen which are respectively arranged at the middle front position of the expansion section in the flow direction of the aerial fog and the connection position of the expansion section and the stable transition section, and the mesh number of the two gauze screens is 80-180 meshes.

Furthermore, one of the gauzes of the stable transition section is a fourth gauze and is arranged at the joint position of the stable transition section and the ventilation pipe, and the mesh number of the gauzes is 80-180 meshes.

Further, the gauze is a super-hydrophobic gauze.

Furthermore, the smooth transition section, the vent pipe and the nozzle are in a smooth transition step contraction shape in at least one linear direction perpendicular to the aerosol flow direction, and the contraction ratio is 0.7-0.9.

Further, the speed of an aerial fog inlet of the aerial fog adding section is 5-30 m/s; the flow speed of the aerosol before each gauze is not lower than 1.5 m/s.

Further, the divergence angle of the divergent section is 60-75 deg.

Furthermore, there are a plurality of ventilation pipes and nozzles, each ventilation pipe is connected with the stable transition section in a penetrating way side by side, and each ventilation pipe is connected with a plurality of nozzles in a penetrating way.

A post-plating aerosol cooling method comprises the following steps:

aerial fog addition: the air fog adding section of the air fog cooling device after plating is connected with an outlet pipeline of the fan, air is introduced into the air fog adding section through the fan, and meanwhile fog drops are sprayed to the air fog adding section through an atomizing nozzle in the air fog adding section; under the combined action of the fan and the atomizing nozzle, the air and the fog drops are primarily mixed into the fog;

secondary atomization: the aerial fog reaches the gauze arranged in the aerial fog adding section, and the aerial fog is uniform and the fog drops are atomized for the second time under the action of the gauze;

and (3) atomizing again: the aerial fog sequentially enters the expansion section and the smooth transition section, sequentially passes through the gauze arranged in the expansion section and the gauze arranged in the smooth transition section, is subjected to aerial fog homogenization under the action of the gauze, and further atomizes the large fog drops again;

spraying gas mist: the gas mist sequentially enters the ventilation pipe and the nozzle and is sprayed out through the nozzle to cool the strip steel.

The invention has the beneficial effects that:

(1) according to the invention, the multiple layers of gauze are arranged along the aerosol flow path, so that air inflow is uniform, the distribution uniformity of the aerosol is improved, the aerosol is atomized for multiple times, the proportion of the large-particle-size aerosol is reduced, and the efficiency and uniformity of aerosol cooling are finally improved.

(2) The design of the multilayer gauze provides conditions for realizing the increase of the expansion angle of the expansion section, lays a foundation for the overall miniaturization design of the aerial fog cooling device, enables the aerial fog cooling device to be more compact as a whole, and reduces the cost of the device at the same time.

(3) According to the invention, the gas fog cooling device is designed into an expansion-contraction shape, and particularly, the smooth transition section, the ventilation pipe and the nozzle are designed into a smooth transition step contraction shape in the linear direction perpendicular to the gas fog flowing direction, so that the influence of the side wall effect is reduced, and the improvement of the dispersion uniformity of the fog drops is facilitated.

Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.

Drawings

For the purposes of promoting a better understanding of the objects, aspects and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:

FIG. 1 is a side view of a post-plating aerosol cooling device of the present invention;

fig. 2 is a top view of fig. 1.

Reference numerals: the device comprises an aerosol adding section 1, a first gauze 2, a second gauze 3, a third gauze 4, a fourth gauze 5, a ventilating pipe 6, a nozzle 7, an expansion section 8 and a stable transition section 9.

Detailed Description

The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the features in the following embodiments and examples may be combined with each other without conflict.

Wherein the showings are for the purpose of illustrating the invention only and not for the purpose of limiting the same, and in which there is shown by way of illustration only and not in the drawings in which there is no intention to limit the invention thereto; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.

The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", etc., based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not an indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes, and are not to be construed as limiting the present invention, and the specific meaning of the terms may be understood by those skilled in the art according to specific situations.

Referring to fig. 1 to 2, a post-plating aerosol cooling device is used for aerosol cooling of a strip steel, where the top-bottom direction in fig. 1 is a width direction, and the top-bottom direction in fig. 2 is a length direction. The device includes aerial fog according to aerial fog flow direction through connection's aerial fog interpolation section 1 in proper order, expansion section 8, steady changeover portion 9, ventilation pipe 6 and nozzle 7.

Aerial fog adds section 1 and the outlet duct intercommunication of fan in order to let in the air, and the inside of aerial fog adds section 1 has atomizing nozzle along the circumference equipartition in order to spray the fog droplet.

The inside of aerial fog interpolation section 1 sets up first gauze 2 on the plane of perpendicular to aerial fog flow direction, and the inside atomizing nozzle that sets up of aerial fog interpolation section 1 is preceding at first gauze 2, and first gauze 2 is located aerial fog interpolation section 1 position after the well on aerial fog flow direction.

The second gauze 3 and the third gauze 4 are sequentially arranged in the expansion section 8 on a plane vertical to the flow direction of the aerial fog and are respectively positioned at the middle front position of the expansion section 8 in the flow direction of the aerial fog and the connection position with the stable transition section 9.

The fourth gauze 5 is arranged in the stable transition section 9 on a plane perpendicular to the flow direction of the aerosol, and the fourth gauze 5 is positioned at the joint position of the stable transition section 9 and the vent pipe 6.

The first, second, third and

fourth screens

2, 3, 4 and 5 are superhydrophobic by being superhydrophobic. The installation position of each layer of gauze on this aerial fog cooling device is equipped with the trompil in one side, and inside sets up corresponding slot, and each layer of gauze arranges into the picture peg form, inserts the picture peg slot through the trompil, then through apron, clamp and the sealed trompil of sealing washer combination, guarantees this aerial fog cooling device's gas tightness.

The first gauze 2, the second gauze 3, the third gauze 4 and the fourth gauze 5 all play a role in uniform air flow and increase the uniformity of fog drop dispersion, so that each layer of gauze needs to have certain resistance, namely a certain mesh number. Meanwhile, considering that the first gauze 2 plays a role in secondarily atomizing the fog drops from the atomizing nozzle, the mesh number of the first gauze 2 is selected to be 120-200 meshes; the second gauze 3, the third gauze 4 and the fourth gauze 5 play a role in atomizing the coalesced large fog drops again, and the mesh number of the second gauze, the third gauze and the fourth gauze is selected to be 80-180 meshes.

The stable transition section 9 is in through connection with three identical ventilation pipes 6 which are arranged side by side and at equal intervals, and each ventilation pipe 6 is in through connection with two identical nozzles 7. The three ventilation pipes 6 can divide the gas fog from the stable transition section 9 and then spray out from the nozzles 7 connected with the ventilation pipes 6.

In order to reduce the influence of the side wall effect and improve the dispersion uniformity of the fog drops, the smooth transition section 9, the ventilation pipe 6 and the nozzle 7 are in a smooth transition step contraction shape in the width direction, and the contraction ratio is 0.7-0.9. In calculating the contraction ratio, the calculation reference in the width direction of the draft tube 6 and the nozzle 7 is the distance from the upper end surface of the uppermost draft tube 6 and nozzle 7 to the lower end surface of the lowermost draft tube 6 and nozzle 7 in fig. 1.

In order to avoid the fog drop sedimentation caused by too low flow velocity in the aerial fog cooling device and the atomization and fog drop crushing capabilities of each layer of gauze, the aerial fog inlet speed of the aerial fog adding section 1 is 5-30 m/s; the flow speed of the aerosol before each gauze is not lower than 1.5 m/s.

In order to miniaturize and compact the whole device, the expansion angle of the expansion section 8 is 60-75 degrees. And the existence of second gauze 3 and third gauze 4 effectively avoids appearing big air current swirl in the expansion section 8, guarantees that the air current is steady in the same direction as straight.

The method for cooling the strip steel by using the gas fog cooling device comprises the following steps:

s1, aerial fog addition: the gas fog adding section 1 of the gas fog cooling device after plating is connected with an outlet pipeline of a fan, air is introduced into the gas fog adding section 1 through the fan, and meanwhile, fog drops are sprayed to the gas fog adding section 1 through an atomizing nozzle in the gas fog adding section 1; under the combined action of the fan and the atomizing nozzle, the air and the fog drops are primarily mixed into the fog;

s2, secondary atomization: the aerial fog reaches a first gauze 2 arranged in the aerial fog adding section 1, and the aerial fog is uniform and the fog drops are atomized for the second time under the action of the aerial fog;

s3, secondary atomization: the aerial fog sequentially enters the expansion section 8 and the smooth transition section, sequentially passes through the second gauze 3, the third gauze 4 and the fourth gauze 5 which are arranged inside the expansion section 8 and inside the smooth transition section, is evenly aerial fog under the action of the second gauze 3, the third gauze 4 and the fourth gauze 5, and is further atomized again to the large aggregated fog drops;

s4, spraying aerial fog: the aerial fog is divided into three ventilation pipes 6 and sprayed out through nozzles 7 connected with the three ventilation pipes 6 to cool the strip steel.

Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.

Claims

1. a post-plating aerosol cooling device is characterized in that: comprise the aerosol adding section, the expansion section, the smooth transition section, the ventilation pipe and the nozzle which are connected successively according to the flow direction of the aerosol; the described aerosol adding section and the fan The outlet pipe of the aerosol is connected to let in air, and the inside of the aerosol adding section is evenly distributed with atomizing nozzles along the circumferential direction to spray mist droplets; A gauze is arranged on the upper part, and the atomizing nozzle is arranged inside the aerosol adding section in front of the gauze.

2. The post-plating aerosol cooling device according to claim 1, characterized in that: there is one gauze in the aerosol adding section, which is the first gauze, and is arranged in the aerosol adding section in the flow direction of the aerosol In the middle and rear position, the mesh number is 120-200 mesh.

3. The post-plating aerosol cooling device according to claim 1, characterized in that: there are two gauze meshes in the expansion section, which are the second gauze mesh and the third gauze mesh, which are respectively arranged in the expansion section in the aerosol area. The middle and front position in the flow direction and the handover position with the smooth transition section are 80-180 meshes.

4. The post-plating aerosol cooling device according to claim 1 is characterized in that: the gauze of the smooth transition section has one, which is the fourth gauze, which is arranged at the handover position of the smooth transition section and the ventilation pipe, and its The mesh number is 80-180 mesh.

5 . The post-plating aerosol cooling device according to claim 1 , wherein the gauze is a super-hydrophobic gauze. 6 .

6. The post-plating aerosol cooling device according to claim 1 is characterized in that: the smooth transition section, the ventilation pipe and the nozzle are in a smooth transition step-contraction shape in at least one linear direction perpendicular to the flow direction of the aerosol, The shrinkage ratio is 0.7-0.9.

7. The post-plating aerosol cooling device according to claim 1 is characterized in that: the aerosol inlet velocity of the aerosol adding section is 5-30m/s; the aerosol flow velocity before each gauze is not low at 1.5m/s.

8 . The post-plating aerosol cooling device according to claim 1 , wherein the expansion angle of the expansion section is 60°-75°. 9 .

9. The post-plating aerosol cooling device according to claim 1, characterized in that: there are a plurality of said ventilation pipes and nozzles, each ventilation pipe is connected side by side with the smooth transition section, and each ventilation pipe is connected through a plurality of nozzle.

10. A post-plating aerosol cooling method, characterized in that: comprising the following steps:

Aerosol addition: The aerosol adding section of the post-plating aerosol cooling device is connected to the outlet pipe of the fan, and air is introduced into the aerosol adding section through the fan, and at the same time, the aerosol adding section is fed to the aerosol adding section through the atomizing nozzle inside the aerosol adding section. Spray droplets; under the combined action of fan and atomizing nozzle, air and droplets are initially mixed into aerosol;

Secondary atomization: The aerosol reaches the gauze set inside the aerosol adding section, and under its action, the aerosol is uniform and the droplets are atomized again;

Re-atomization: The aerosol then enters the expansion section and the smooth transition section in turn, and passes through the gauze set inside the expansion section and the smooth transition section in turn, and under the action of the gauze, the aerosol is uniformized, and the large mist droplets are further atomized again. ;

Aerosol spray: The aerosol then enters the ventilation pipe and the nozzle in turn, and is sprayed out through the nozzle to cool the strip.