WO2013173996A1

WO2013173996A1 - Integrated venturi air washing device

Info

Publication number: WO2013173996A1
Application number: PCT/CN2012/075987
Authority: WO
Inventors: 熊靓; 朱核光
Original assignee: 深圳市泓耀环境科技发展股份有限公司
Priority date: 2012-05-24
Filing date: 2012-05-24
Publication date: 2013-11-28

Abstract

An integrated Venturi air washing device, comprising two cylinder bodies communicated with each other. One cylinder body is a washing tower, and it can finish not only pre-washing processing, such as cooling and humidification of waste gas, but also injection of a washing liquid and intensive mixing of the washing liquid and flue gas. The other cylinder body is a separating tower, and it is mainly used for gas-liquid separation. The two cylinder bodies are connected through a communicating pipe to be structurally integrated. The waste gas is washed and separated by utilizing a Venturi effect and a cyclone separation principle after being pre-processed.

Description

Integrated venturi air washer

Technical Field

The invention relates to a venturi air washing device, which can be applied to purification of various exhaust gas and exhaust gas generated by power plant and incinerator flue gas, petrochemical plant catalytic cracking regeneration flue gas, industrial furnace kiln flue gas, chemical plant reaction device. The treatment can also be used for air purification in various workshops and by-product recovery in industrial exhaust gas, and belongs to the technical field of exhaust gas treatment equipment.

Background Art

In an exhaust gas treatment system, an air scrubber is an effective device for removing particulate matter and gas components. Common industrial waste gases such as power plants and incinerator flue gas, petrochemical plant catalytic cracking regenerative flue gas, various industrial furnace flue gas, various types of exhaust gas generated by chemical plant reaction devices, and various types of workshops produced in the process of pollution Air, etc., contain contaminants or recyclables including particulate and gaseous components. Particulate components generally refer to inclusions having a solid or liquid diameter in the submicron range and above. If the above-mentioned exhaust gas is not treated, its components will be harmful to the environment when it is discharged into the environment, and it may seriously threaten the health of the workers in contact with it; it is also a kind of non-recycling of components with recycling value. Big waste. The main purpose of waste gas treatment is to separate or remove these harmful substances or recoverable components contained in the exhaust gas from the exhaust gas. Air washing device Scrubber or air The basic principle of the cleaner is to spray a washing liquid (also called an absorbing liquid or a washing liquid) into the gas, so that the particles or gas components contained in the exhaust gas are transferred to the larger liquid to be separated from the air. .

The operation of the air scrubber is affected not only by the nature of the components removed and the nature of the scrubbing fluid used, but also by the specific surface area of the scrubbing liquid in contact with the air and the rate at which the removed components are close to the scrubbing liquid. The increased airflow velocity and velocity gradient cause the airflow to form a vortex, which increases the mass transfer between the particles and the gas component and the surface of the absorbing liquid as well as the chemical reaction speed, and also accelerates the wetting of the surface for solid dust. Temperature is also very important if the component being removed is a gas, or is volatile or condensed. If the temperature of the gas to be separated is higher than the temperature of the absorbing liquid, the gas is cooled by washing, and the condensation process occurs. However, when the temperature of the gas is too high and exceeds the boiling point of the washing liquid, the washing liquid is volatilized, thereby affecting the washing effect. Therefore, if the absorbing liquid used is an aqueous solution and the temperature of the gas to be treated is higher than the boiling point of water, the gas must first be cooled below the boiling point of the absorbing liquid. Cooling causes a decrease in fluid entropy, while solid particles present in the gas tend to become the core of condensation, accelerating condensation.

The separation process is accompanied by a certain energy consumption, which is mainly to form the energy required to promote the fluid turbulence necessary for the transfer of solid and gas components and the liquid between the absorbing liquids, and between the washing liquid and the peripheral wall of the washing liquid. The resulting frictional resistance, which is primarily provided by the kinetic energy of the intake airflow, is manifested by a decrease in pressure along the direction of gas flow. Under the condition that the exhaust gas and the absorption liquid have certain properties, the separation effect is proportional to the severity of the airflow turbulence and the resulting airflow energy loss.

In the case of high washing requirements, the flow rate of the gas in the scrubber is tens or even hundreds of meters per second, and the pressure drop is also thousands or even tens of pascals. This wet scrubber is Differential pressure cleaning system Pressure cleaning Systems)". The most common differential pressure cleaning system is the venturi scrubbing system, which has many different designs. The main feature of the venturi scrubbing system is that it takes full advantage of the venturi effect of the fluid and is set in the air path. Narrow venturi or venturi throat (Venturi Tube or Venturi Throttle). When the exhaust gas enters the venturi or throat, it generates high acceleration and causes the static pressure to suddenly decrease. The resulting high shear force and huge pressure drop can greatly increase the turbulence of the airflow, causing the absorption liquid entering the throat to be broken. The formation of extremely fine particles, thereby generating a huge gas-liquid contact surface area, allows the components to be treated in the exhaust gas to be efficiently and quickly transferred to the liquid. After the gas leaves the throat, the pressure returns to a level that is close to or slightly lower before entering the throat, the gas flow slows, the droplets re-aggregate and become larger, and are separated and removed in the subsequent gas-liquid separation device. The absorbing liquid is usually injected into the narrowest section of the throat cross section by means of a spray device arranged in the axial or transverse direction. According to different separation requirements, the pressure drop usually through the throat is 2000-3000 Pascal. The Venturi scrubbing system is very effective in separating and removing particles with a particle size of 1-100 microns, and the removal efficiency can reach over 95%. The mass inertia-based treatment methods such as gravity sedimentation or cyclone separation are used to separate this size. The efficiency of the particles is relatively low.

The washing effect of the Venturi washing system is strongly influenced by changes in wind load, which is closely related to the speed of the airflow through the venturi throat and the shortening of the dwell time. This problem can be partially solved by changing the cross-sectional shape of the venturi throat, such as the throat cross-section being designed to be rectangular and the wall being designed to vary and be adjustable in the direction of air flow. Another way to solve the wind load fluctuation problem is to absorb some secondary air or air to reconcile the trough, but the above solution is more difficult in process design and equipment manufacturing.

Another differential pressure washing system that utilizes the Venturi effect is an annular gap scrubber (annular gap) Cleaner). In this washing system, a conical body is arranged on the central shaft, and an annular gap is formed between the conical body and the inner wall of the chamber, and the venturi annular cross-flow is realized by the axial displacement of the conical body. The change in section. Due to the narrow space of this gap, the air passes through the gap at a high speed, resulting in a high mixing effect. The shortcoming of this design is that the structure is relatively complicated and the manufacturing process is difficult, especially the processing of the cone and the axial center positioning of the cone and the chamber. A slight deviation will have a great impact on the operation of the device. . In addition, the annular gap scrubber is bulkier than other venturi scrubbers, and the treatment effect is not as good as the latter, especially when the scrubbing gas contains condensable or vaporizable components.

In summary, the current venturi air scrubbing system is superior to other washing devices in gas mixing, mass transfer efficiency, and washing efficiency. Some venturi scrubbing devices (such as rectangular venturi slots and wall shapes flow along the airflow) The direction changes and can be adjusted, or the venturi throat is designed as an annular slit and the position of the built-in cone is adjusted, etc.) also partially overcomes their shortcomings of poor resistance to disturbing wind loads, but their structure is complicated. There are relatively high requirements for manufacturing; moreover, the current design has a relatively small adjustment of the flow rate through the venturi throat or notch.

On the other hand, the choice of the subsequent gas-liquid separation system has a significant influence on the performance of the entire venturi washing system, especially when the venturi unit is designed as a rectangular notch, and the subsequent gas-liquid separation tower should be able to make full use of Wenqiu. The flow velocity of the outflow in the slot is high, and the airflow section is a narrow fluid characteristic, otherwise energy waste or structural irration may be caused. The droplets formed in the venturi throat are smaller than those formed in other air scrubbing systems, which may have a negative impact on subsequent gas-liquid separation. These factors must also be considered when designing a gas-liquid separation column.

In addition, in order to optimize the washing effect of the venturi washing system, it is also necessary to control and adjust the temperature and humidity of the exhaust gas. Since the gas stays in the venturi notch for a very short time, usually less than 0.01 seconds, when the humidity in the air is low (such as relative humidity below 80%), the surface of the solid particles contained in the exhaust gas is relatively dry. The liquid particles formed in the venturi notch of the washing liquid are too small, so that the larger solid particles are not sufficiently wetted in the venturi notch, and thus cannot be well removed.

Furthermore, for large-scale exhaust gas treatment projects, especially for large power plants and boilers, the single-channel venturi throat design will result in the same resistance loss due to the excessive cross-section of the throat and insufficient local velocity gradient. Under the local shear force is too small, which affects the overall airflow turbulence and removal effect. When the amount of flue gas is too large, the height of the single venturi notch will also become large, so that the venturi washing device takes up a large space.

Technical Problem

The application of the present invention aims to provide an integrated and integrated venturi air washing device, and maximize the mixing efficiency of the venturi notch, and flexibly and conveniently adjust the venturi notch to improve the stability of the system operation and Adaptability to fluctuating wind loads reduces drag loss and also accommodates the processing requirements of large flow flue gases.

Technical Solution

The Venturi effect, also known as the Venturi effect, is one of the foundations of the dynamics of the application of the present invention. It is the discoverer of the Italian physicist Giovanni Battista. Venturi) to name it. This effect means that a low pressure is generated in the vicinity of a gas flowing at a high speed. This effect can be used to create venturi tubes for different purposes. When a gas or liquid flows in a venturi, the velocity of the gas or liquid changes as a function of the cross-sectional area of the flow. At the narrowest point of the pipe, the dynamic pressure reaches a maximum and the static pressure reaches a minimum. According to the Venturi effect principle, when the wind blows over the barrier, a low air pressure can be formed near the leeward side of the barrier, thereby absorbing the surrounding air and causing turbulence of the air.

The integrated venturi air washing device according to the application of the present invention comprises two cylinders communicating with each other, wherein one of the cylinders is a washing tower, which can complete pre-washing treatment such as cooling and humidification of exhaust gas, and can complete washing. The injection of the liquid and its full mixing with the flue gas, the other cylinder is a separation tower, which mainly completes the gas-liquid separation, and the two cylinders are connected by the communication tube, so that they are integrated into the structure, and the structure of each part is as follows Said:

1, The top of the washing tower is connected with the flue gas discharge pipe of the factory or the workshop. The washing tower is divided into a pretreatment zone, a washing liquid spray zone, a venturi notch and a turbulent reaction zone from top to bottom, and the turbulent reaction zone is connected. The tube is connected to the middle of the separation tower, and the airflow entering the separation tower through the communication tube enters the separation tower along the tangential direction of the cross section of the separation tower;

2, The bottom of the separation tower is provided with a collecting tank, and the middle part of the separation tower is a separation zone where the exhaust gas and the liquid are separated, and the uppermost end of the separation tower is an outlet zone, which is connected to the exhaust fan or the chimney, so that the treated exhaust gas can be discharged;

3, The pretreatment zone of the washing tower is provided with a pretreatment nozzle, the spray range covers the entire flow cross section, and the washing liquid spray area is below the pretreatment zone, and a washing liquid nozzle is provided, and the washing liquid nozzle is arranged at the venturi notch. Above

4, The venturi notch is composed of two sets of columnar bodies which are parallel to each other and function differently, and are respectively a plurality of large-diameter divided columnar bodies located above and a plurality of smaller diameter blocking columnar bodies located below, and the divided columnar bodies and The self-aligning column and the alignment direction are perpendicular to the airflow direction, and the positions of the divided columnar bodies are fixed, and each of the divided columnar bodies penetrates the cross section of the washing tower, and the sum of the cross-sectional diameters of the divided columnar bodies is substantially the same as the cross-sectional diameter of the washing tower body. Equally, a blocking column is placed directly below the space between each two adjacent divided columns, and the windward side and the leeward side of the divided column are provided as needed to prevent the airflow from appearing before entering the venturi notch. a deflector of the partial vortex, the leeward side of the blocking column is fixed on an adjustable spiral connecting rod, and the rotating spiral connecting rod can arbitrarily adjust the position of the blocking column along the airflow direction;

5, The space behind the venturi notch is a turbulent reaction zone. In the turbulent reaction zone, the average flow velocity returns to a level close to the venturi throat. The static pressure is increased and the shear force of the airflow is suddenly reduced. The droplets are no longer separated after contact with each other, and the accumulation of particles becomes large.

Further, the washing tower and the separation tower may be placed in parallel with each other or at an angle to each other. When placed at an angle of 90°, the separation tower can be placed vertically, the washing tower can be placed horizontally, or the washing tower can be placed vertically to place the separation tower horizontally.

Further, a wind deflector for preventing the airflow entering the separation tower from blowing the liquid level of the collecting pool is further disposed above the collecting pool in the separation tower.

Further, a water collector is selectively disposed under the separation tower near the outlet region, and the water collector may be a honeycomb or a folding plate or a filter type water collector.

Further, the washing liquid in the bottom collecting tank of the separation tower is pumped by the water pump to the pretreatment nozzle and the washing liquid nozzle of the washing tower.

Further, the pretreatment nozzle and the washing liquid nozzle respectively supply the washing liquid from the special pool containing the washing liquid through the water pump.

Further, the water pump comprises a submerged water pump placed in a sump or a sump or a centrifugal water pump disposed outside the sump or the sump.

Further, the number of the pretreatment nozzles is one or more.

Further, the pretreatment nozzle may be fixed on the inner wall of the washing tower or may be fixed on the flow cross section.

Further, the direction in which the washing liquid in the pretreatment nozzle is sprayed may be at any angle to the direction of air flow.

Further, the residence time of the exhaust gas in the pretreatment zone is not more than 0.5 seconds.

Further, the washing liquid may be factory process water or any kind of water or ordinary washing liquid or chemical solution. In the pretreatment zone, the exhaust gas and other high temperature exhaust gas are cooled to below the boiling point of the washing liquid used, if used. The washing liquid is water or an aqueous solution, then cooled to 100 Below °C, the relative humidity of the exhaust gas in the pretreatment zone increases to nearly 100%.

Further, the number of the washing liquid nozzles is one or more.

Further, the arrangement of the washing liquid nozzles is evenly arranged along the length direction of the venturi notch, and the washing liquid nozzle spraying covers the entire venturi notch, and the washing liquid spray direction can be at any angle with the air flow direction.

Further, the material of the venturi scrubber and the separation tower is made of stainless steel or ordinary steel lining anticorrosive material (such as Teflon), or may be high strength and high temperature resistant plastic or resin. Or reinforced concrete material (the inner wall is coated with anti-corrosion layer).

Further, the cross section of the main body of the washing tower may be designed in the shape of a circle, a square or a rectangle, and the cross section of the main body of the separation tower is generally circular, and may be designed into other shapes.

Further, the cross-sectional shape of the connecting pipe is generally square or rectangular, and the manufacturing material and the washing tower are made of the same material.

Further, the manufacturing material of the segmentation and blocking columnar body is generally made of a material such as metal or high-strength temperature-resistant plastic.

Further, the cross-section of the segmented columnar body may be circular, elliptical, rhombic, drop-shaped, or any geometric shape that facilitates the formation of the Venturi effect.

Further, the cross section of the blocking column may be circular, elliptical or any geometry that facilitates the formation of the Venturi effect and is in close contact with the surface of the large column.

Further, the screwed connecting rod can be manually or electrically adjusted, and can be automatically adjusted by electric flow or by pressure change of the venturi notch during electric adjustment.

In this way, a special bifurcated and automatically adjustable venturi notch is formed between each of the two large divided columns and a small blocking column, and the position of the blocking column is fully adjusted to allow the entire venturi groove. The port is closed, so that the venturi notch also has a valve function. When needed (such as equipment failure needs to be repaired), all the slots can be closed, so that the exhaust gas entering the washing tower changes the flow direction, and the exhaust gas is introduced into the overrunning pipeline. When the number of slots is more than one, the opening sizes of the different slots are respectively adjusted, and the distribution of the air volume in the different slots can be changed, thereby changing the distribution of the air volume on the flow cross section, and in some cases, closing the partial slots. Such a design can make the venturi more adjustable and easy to match with subsequent separation devices. The number of slots is selected according to the flow rate of the exhaust gas to be treated. Generally, fewer slots are used when the flow rate is low, and more slots are used when the flow rate is large.

Advantageous Effects

The integrated venturi air washing device described in the present application has the following features and advantages:

1, A new integrated venturi scrubbing system and unit can be provided for exhaust gas treatment, and the Venturi notch design allows for automatic adjustment based on changes in air volume or venturi pressure differential;

2, Since the venturi slots can be arranged in multiple channels, the flow through the different slots can be controlled separately, so that the distribution of the airflow in the cross section can also be adjusted, which increases the adjustability of the venturi washing system, so that the washing tower The outflow can be better matched to the gas inlet requirements of the subsequent separation column, which can greatly reduce the resistance and energy consumption of the entire washing system during large flow flue gas treatment;

3, The multi-notch design at high flow rates reduces the height of the notch compared to the design of a single venturi notch, resulting in a lower height of the scrubber, pre-washing and subsequent cyclonic separation specifically for the characteristics of the chute notch The setting makes the whole system an efficient and organic one.

The venturi air washing device of the invention has the advantages of small volume, flexible arrangement, simple manufacture, flexible regulation, and can be adapted to various applications from large flue gas treatment to small workshop air purification.

Description of Drawings

1 is a schematic cross-sectional structural view of an integrated venturi air washing device according to an embodiment of the present invention;

Figure 2 is a schematic cross-sectional view taken along line A-A of Figure 1;

Figure 3 is a cross-sectional, cross-sectional view taken along line B-B of Figure 1;

4 to 7 are schematic diagrams showing the design of different venturi slots according to the present invention;

Among them, 1 is the pretreatment zone, 2 is the washing liquid spray zone, 3 is the venturi notch, 4 is the turbulent reaction zone, 5 is the communication pipe, 6 is the separation zone, 7 is the exit zone, 8 is the pretreatment nozzle 9 is a washing tower wall, 10 is a baffle, 11 is a washing liquid nozzle, 12 is a divided column, 13 is a blocking column, 14 is a connecting rod, 15 is a windshield, 16 is a collecting tank, 17 is The separation tower wall and 18 are connected to the pipe wall.

Mode for Invention

The device will be described below in conjunction with the accompanying drawings and specific embodiments for the purpose of better understanding of the technical contents of the public, and not limiting the techniques; the same or similar principles, The improvements made by the apparatus, including its shape, size, materials used, and equivalent replacement of the corresponding parts, for the purpose of achieving substantially the same effect, are all within the technical solutions claimed in the present application.

In addition, in the present application, the description of "up, down" or "left and right" between different components merely indicates the mutual positional relationship between the different components, rather than the definition of the spatial position thereof.

Example 1

In the venturi washing apparatus shown in Figures 1-3, the washing tower is placed side by side with the separation tower. The flue gas to be treated is firstly taken from the flue gas discharge pipe of the factory or the workshop into the pretreatment zone 1 at the top of the scrubbing tower, the residence time of the flue gas in the pretreatment zone 1 is generally less than 0.5 seconds, and the plurality of pretreatment nozzles 8 are fixed in the washing. The tower wall 9 is sprayed into the pretreatment zone 1 at an angle of 60 to the direction of the gas flow. The pre-washing liquid acts as a washing liquid, and is sent by a water pump from the sump 16 provided at the lower portion of the separation tower 6 to the pretreatment nozzle 8, and the temperature of the flue gas is lowered to 80 after pre-washing treatment. °C, relative humidity is 100%.

After the flue gas leaves the pretreatment zone 1, it enters the washing liquid spray zone 2 and receives the spray of the spray liquid. The washing liquid nozzles 11 in the spray zone are disposed directly above the venturi notch 3 and are evenly arranged along the longitudinal direction of the venturi notch 3, and the spray liquid is sprayed in the same direction as the air flow direction. The choice of the washing liquid is determined according to the composition of the flue gas to be removed, and a caustic solution is used in this embodiment.

The flue gas passes through the washing liquid spray zone 2 and enters the venturi notch 3, and the venturi notch 3 is composed of a slit formed between the divided columnar body 12 and the blocking columnar body 13 placed perpendicularly to the airflow direction. The columns are parallel to each other, and a group of the divided columns 12 are placed side by side in front of the wind direction, and the sum of their cross-sectional diameters (or widths) and the cross-sectional diameter (or width in one direction) of the main tower of the scrubber are They are roughly equal (within 10% difference). A baffle 10 is provided on the side facing the air inlet side and the side facing the air inlet of the divided columnar body 12, for preventing the local vortex from appearing before the airflow enters the venturi slot and from the venturi slot, thereby causing unnecessary Energy loss. A blocking column 13 having a small cross section is placed directly below the space between the two adjacent divided columns 12 (gas outflow end), and the portion of the leeward blocking the column 13 is fixed to an adjustable spiral connection. On the rod 14, the helically-connected rod 14 functions to effect the lifting and lowering of the columnar body 13, the structure of which is well known to those skilled in the art and will not be described herein; the rotating link 14 may cause the blocking column 13 to follow along The flow direction of the air flow is arbitrarily adjusted. Thus, a combination of the two large split columns 12 and a small barrier column 13 forms a special bifurcation and can be automatically adjusted to the venturi notch 3, adjusting the position of the damped column and even the entire venturi slot The mouth is closed.

After the flue gas comes out of the venturi trough 3, it enters the turbulent reaction zone 4. In the turbulent reaction zone 4, the average flow velocity of the gas flows back to the level before entering the venturi throat, and the static pressure is also recovered. The shear force is drastically reduced, the droplets are no longer separated after contact with each other, and the particle accumulation becomes large.

The flue gas exits the turbulent reaction zone 4 and enters the separation zone 6 of the separation column through the communication pipe 5, and the communicating pipe wall 18 is seen in the figure. Since the flow velocity of the gas flow from the turbulent reaction zone 4 is relatively large, its kinetic energy The cyclone separation operation is used to drive the separation zone 6 in the separation column, so that the gas flow inlet entering the separation zone 6 is designed such that the gas flow enters in the tangential direction of the cross section of the separation tower wall 17.

The cross section of the separation zone 6 of the separation column is designed to be circular, so that the kinetic energy of the outflow of the scrubber can be utilized to cause the gas to form a vortex in the separation column to achieve cyclone separation. A sump 16 is provided at the bottom of the tower for collecting the separated washing liquid, and functions as a sump pool and a washing liquid mixing tank of the washing liquid circulation pump. The absorbing liquid in the sump 16 is sent to the absorbing liquid nozzle or the pretreatment nozzle of the absorption tower by a submerged water pump installed in the sump or a centrifugal water pump disposed outside the pool. A wind deflector 15 is provided at the upper portion of the sump 16 for preventing the airflow entering the cyclone from blowing up the liquid level of the absorbing liquid.

The flue gas is separated by a cyclone in the separation column, and the larger droplets contained therein are separated and removed. The remaining fine droplets can be further separated by the water trap 19. The water collector can be a honeycomb or a flap or a filter trap. The finally treated flue gas passes through the exit zone 7 and is sent to an exhaust fan and a chimney for discharge.

Example 2

The venturi scrubber and the cyclone separation tower may be placed parallel to each other as described in the above embodiments, or may be placed at an angle to each other. When placed at an angle of 90°, the separation tower can be placed vertically, the washing tower can be placed horizontally, or the washing tower can be placed vertically to place the separation tower horizontally. When the separation tower is placed horizontally, it is still necessary to have a slope greater than one thousandth in the horizontal direction, so that the separated washing liquid can flow into the sump along the wall surface. At this time, the sump can be disposed beside the main separation tower. And connected to the bottom of the main separation tower by pipes.

Example 3-6

The design of the Venturi notch can be arranged according to the actual situation. As shown in FIG. 4 to FIG. 7, the cross section of the divided columnar body 12 may take various shapes such as a circular shape, an elliptical shape, a rhombus shape, and a water drop type; and the cross section of the blocking columnar body 13 is generally circular or Oval.

Claims

The utility model relates to an integrated venturi air washing device, which comprises two cylinders connected to each other, wherein one cylinder body can complete pre-washing treatment such as cooling and humidification of exhaust gas, and can complete injection of washing liquid and smoke with the same. The fully mixed washing tower, the other cylinder is a separation tower that completes the gas-liquid separation, and the two cylinders are connected by the connecting pipe as a whole, and are characterized by:

1) The top of the washing tower is connected with the flue gas discharge pipe of the factory or the workshop. The washing tower is divided into a pretreatment zone, a washing liquid spray zone, a venturi notch and a turbulent reaction zone from top to bottom, and the turbulent reaction zone is connected. The tube is connected to the middle of the separation tower, and the airflow entering the separation tower through the communication tube enters the separation tower along the tangential direction of the cross section of the separation tower;

2) The bottom of the separation tower is provided with a collecting tank, and the middle part of the separation tower is a separation zone where the exhaust gas and the liquid are separated, and the uppermost end of the separation tower is an outlet zone, which is connected to the exhaust fan or the chimney, so that the treated exhaust gas can be discharged;

3) The pretreatment zone of the washing tower is provided with a pretreatment nozzle, the spray range covers the entire flow cross section, and the washing liquid spray area is below the pretreatment zone, and a washing liquid nozzle is provided, and the washing liquid nozzle is arranged at the venturi notch. Above

4) The venturi notch is composed of two sets of columnar bodies which are parallel to each other and function differently, and are respectively a plurality of large-diameter divided columnar bodies located above and a plurality of smaller diameter blocking columnar bodies located below, and the divided columnar bodies and The self-aligning column and the alignment direction are perpendicular to the airflow direction, and the positions of the divided columnar bodies are fixed, and each of the divided columnar bodies penetrates the cross section of the washing tower, and the sum of the cross-sectional diameters of the divided columnar bodies is substantially the same as the cross-sectional diameter of the washing tower body. Equally, a blocking column is placed directly below the space between each two adjacent divided columns, and the windward side and the leeward side of the divided column are provided as needed to prevent the airflow from appearing before entering the venturi notch. a deflector of the partial vortex, the leeward side of the blocking column is fixed on an adjustable spiral connecting rod, and the rotating spiral connecting rod can arbitrarily adjust the position of the blocking column along the airflow direction;

5) The space behind the venturi notch is a turbulent reaction zone. In the turbulent reaction zone, the average flow velocity returns to a level close to the venturi throat. The static pressure is increased and the shear force of the airflow is suddenly reduced. The droplets are no longer separated after contact with each other, and the accumulation of particles becomes large.
The apparatus according to claim 1, wherein said washing tower and said separation tower are placed in parallel with each other or at an angle to each other.
The apparatus according to claim 1, wherein a wind deflector for preventing the airflow entering the separation tower from blowing the liquid level of the collecting pool is further disposed above the collecting basin in the separation tower.
The apparatus according to claim 1, wherein said separator is further provided with a water collector below the outlet region.
The apparatus according to claim 1, wherein the washing liquid in the collecting tank at the bottom of the separating tower is pumped by a water pump to a pretreatment nozzle and a washing liquid nozzle of the washing tower.
The apparatus according to claim 1, wherein said pretreatment nozzle and said washing liquid nozzle respectively supply washing liquid from a dedicated sputum pool containing washing liquid through a water pump.
The apparatus according to claim 5 or 6, wherein said water pump comprises a submerged water pump placed in a pool or a sump or a centrifugal water pump disposed outside the sump or the sump.
Apparatus according to any one of claims 1 to 6, wherein the number of said pretreatment nozzles is one or more.
Apparatus according to any one of claims 1 to 6, wherein the pretreatment nozzle is fixed to the inner wall of the washing tower or to the flow cross section.
The apparatus according to any one of claims 1 to 6, characterized in that the direction in which the washing liquid in the pretreatment nozzle is injected is at any angle to the direction of air flow.
Apparatus according to any one of claims 1 to 6, wherein the residence time of the exhaust gas in the pretreatment zone is no more than 0.5 seconds.
The apparatus according to any one of claims 1 to 6, wherein the washing liquid comprises factory process water, any kind of water, ordinary washing liquid or chemical solution, in the pretreatment zone, exhaust gas and Other high temperature exhaust gases are cooled below the boiling point of the wash liquor used.
Apparatus according to any one of claims 1 to 6, wherein the number of said washing liquid nozzles is one or more.
The apparatus according to claim 13, wherein said washing liquid nozzles are arranged uniformly along the longitudinal direction of the venturi notch, and the washing liquid nozzle sprays over the entire venturi notch.
The apparatus according to any one of claims 1 to 6, wherein the material of the venturi scrubber and the separation tower comprises stainless steel or ordinary steel lining anticorrosive material, high strength and high temperature resistant plastic. Or resin, or apply anti-corrosion layer to the inner wall of reinforced concrete material.
Apparatus according to any one of claims 1 to 6, wherein the cross section of the scrubber body can be designed in a circular, square or rectangular shape.
Apparatus according to any one of claims 1 to 6, wherein the separation tower body is generally circular in cross section and may be designed in other shapes.
The apparatus according to any one of claims 1 to 6, wherein the communication tube has a square or rectangular cross section.
The apparatus according to any one of claims 1 to 6, wherein the material for dividing and blocking the columnar body comprises metal or high-strength temperature-resistant plastic or the like.
The apparatus according to any one of claims 1 to 6, wherein the divided columnar body has a circular, elliptical, diamond-shaped, water-drop type, or any geometric shape favorable for the Venturi effect. .
Apparatus according to any one of claims 1 to 6, wherein the blocking column has a circular, elliptical or any cross-section that facilitates the formation of the Venturi effect and is in close contact with the surface of the large columnar body. Geometry.
A device according to any one of claims 1 to 6, wherein the helically connected link is manually or electrically adjusted.