CN210544236U

CN210544236U - Acceleration type downstream rotation spraying type gas washing tower

Info

Publication number: CN210544236U
Application number: CN201921150948.XU
Authority: CN
Inventors: 刘毅; 孟晓东; 汪琴; 吕文才; 沈华军; 贺嘉东
Original assignee: Jiangsu Longye Energy Saving Technology Co ltd
Current assignee: Jiangsu Longye Energy Saving Technology Co ltd
Priority date: 2019-07-22
Filing date: 2019-07-22
Publication date: 2020-05-19
Anticipated expiration: 2029-07-22

Abstract

The utility model discloses a rotatory fountain gas washing tower of acceleration type following current belongs to scrubbing tower technical field. The utility model discloses a fountain gas washing tower, air inlet wind channel and draught fan including vertical setting, the draught fan blows from top to bottom to the gas of introducing in the air inlet wind channel, is equipped with rotatory spraying mechanism in the air inlet wind channel, and the lower part in air inlet wind channel is equipped with rotatory mechanism that spin-dries, and the rotatory bottom of the section of thick bamboo that spin-dries of rotatory mechanism is equipped with gas-liquid separation passageway, and gas-liquid separation passageway is linked together with the air-out wind channel, and gas-liquid separation passageway's bottom is equipped with and sprays the. The utility model discloses a gaseous and the design of liquid following current that sprays have reduced gas flow resistance to the rotatory mode that sprays of cooperation atomizing has increased the effective contact that sprays liquid and gas, utilizes the rotatory mode that spin-dries to realize quick gas-liquid separation, and fundamentally has solved a series of problems such as current scrubbing tower reaction is insufficient, the gas velocity of flow is low, gas emission contains the moisture content height and tower body structure is huge.

Description

Acceleration type downstream rotation spraying type gas washing tower

Technical Field

The utility model relates to a gas washing tower, more specifically say, relate to a rotatory fountain gas washing tower of acceleration type following current.

Background

The existing reaction processes involving gas reaction and liquid phase shift in chemical industry and environmental engineering use so-called gas scrubbing reaction towers (scrub towers) in large quantities. The washing tower is a gas purification treatment device and is widely applied to pretreatment in the aspects of industrial waste gas purification, dust removal and the like. For coal gasification processes, gas scrubbing is unavoidable and this unit operation is used in whatever coal gasification technology is used. The working principle of the washing tower is similar to that of a washing process, so the washing tower is named.

The gas washing reaction tower is used for absorbing and reacting certain substances in a gas phase state by a liquid phase medium, and then performing gas-liquid separation again, so that the aims of purifying gas components, transferring, absorbing and purifying certain gas phase substances, purifying air and extracting specific substances are finally fulfilled. The scrubbing tower has multiple purposes, the scrubbing tower structures of different purposes are different, taking an environment-friendly common desulfurizing tower as an example, the desulfurizing tower belongs to the category of an acid mist scrubbing tower, and the scrubbing tower for removing dust also has the same structural characteristics and is a typical application of a spray scrubbing tower. The acid mist washing tower utilizes the contact between gas and liquid to transfer the pollutant in the gas into the liquid and separate the clean gas from the polluted liquid to clean air. The waste gas is treated by gas-liquid reverse absorption through the packed acid mist washing tower, i.e. the liquid is sprayed downwards from the top of the tower in the form of mist (or small droplets), and the waste gas is contacted with the gas-liquid from the bottom of the tower (reverse flow). The waste gas can be cooled, the gas can be conditioned and the particles can be removed by the treatment method, and the waste gas is discharged into the atmosphere after being treated by the demisting section.

In summary, the working process of the existing gas scrubber is mainly divided into several processes: gas introducing process, liquid atomizing and spraying process, gas reaction accelerating process in the packing layer and gas-liquid separating and discharging process. The working principle is as follows: gas is introduced from the lower part of the tower to move upwards, liquid is atomized and sprayed downwards, the gas and the liquid in the packing layer move reversely and relatively to strengthen the contact reaction between two-phase flows, and finally the gas is separated from the liquid and discharged through a louver demister at the top of the tower. The above conventional gas scrubber mainly has the following problems:

1) in the gas introduction process, in order to overcome the resistance in the washing process, the gas introduction usually uses a centrifugal fan with higher wind pressure and smaller wind volume, so that the gas wind volume is small and the washing efficiency is lower;

2) in the liquid atomization spraying process, in order to prevent atomized liquid drops from being taken away and escaping along with reverse airflow, the diameter of a washing tower is often enlarged by a spraying tower so as to reduce the wind speed, and the volume of a gas washing reaction tower is increased;

3) in the process of accelerating reaction of gas in the packing layer, the purpose of adding the packing into the spray tower is to slow down the downward flow speed of the spray liquid, increase the gas-liquid contact surface area and improve the reaction sufficiency, but the static packing increases the wind resistance, so that the reaction speed and the flow speed of the gas washing tower are slow;

4) in the gas-liquid separation and discharge process, liquid components in the air are intercepted through the louver type fog dispersal device, but the static louver type demister only can intercept large-particle water drops, the escape rate of the small liquid drops is high, and the gas-liquid separation is insufficient. Although the density of the louvers may be increased to increase separation efficiency, at the expense of increased wind resistance.

Disclosure of Invention

1. Technical problem to be solved by the utility model

The utility model aims to overcome the above-mentioned not enough that current scrubbing tower exists, provide a rotational spray formula gas scrubbing tower of acceleration type following current, adopt the technical scheme of the utility model, through gaseous and the design of liquid following current that sprays, the resistance of gas flow has been reduced, the gas flow speed has been improved to the rotatory mode that sprays of cooperation atomizing has increased the effective contact of liquid and gas that sprays, has improved reaction efficiency, utilizes the rotatory mode that spin-dries simultaneously to discharge water smoke fast, realizes quick gas-liquid separation, has effectively avoided spraying the liquid smoke and has dripped the escape, fundamentally has solved current scrubbing tower reaction inadequately, the gas velocity is low, gas emission contains a series of problems such as wet gauge height and tower body structure size are huge.

2. Technical scheme

In order to achieve the above purpose, the utility model provides a technical scheme does:

the utility model discloses a rotatory fountain gas washing tower of acceleration type following current, including the air inlet wind channel of vertical setting, can be to the draught fan of induced air in the air inlet wind channel, the draught fan blow to the gas of introducing in the air inlet wind channel from top to bottom, the air inlet wind channel in be equipped with the rotatory mechanism that sprays that is used for atomizing rotatory spraying, the lower part in air inlet wind channel be equipped with the rotatory mechanism that spin-dries that is used for gas-liquid separation, the rotatory bottom of the section of thick bamboo that spin-dries of mechanism be equipped with gas-liquid separation passageway, gas-liquid separation passageway be linked together with the air-out wind channel, and gas-liquid separation passageway's bottom is equipped with and sprays the.

As the utility model discloses further improve, rotatory mechanism that sprays including spray liquid center tube and with spray liquid center tube be linked together, along a plurality of shower nozzle groups of the vertical direction of height setting in air inlet duct, the axial circumference that all follows the shower nozzle rotation axis in every group shower nozzle group distributes and has a plurality of atomizing nozzle, every atomizing nozzle's spray direction all is on a parallel with rotatory tangential direction to become certain slant below angle with rotatory tangential direction, shower nozzle group high-speed rotation under atomizing nozzle's injection reaction force effect.

As the utility model discloses further improve, equal coaxial arrangement has the rotatory screw along with the shower nozzle group that corresponds on every group shower nozzle group, the rotation angle of attack of screw downwards.

As the utility model discloses further improve, the same high position of liquid center tube that sprays on evenly be equipped with two sets of and above shower nozzle group along the circumferencial direction, and the shower nozzle group on the adjacent high position has the angle of staggering certainly.

As the utility model discloses the further improvement, the draught fan adopt axial fan, and the draught fan is installed in the upper portion air intake department in air inlet duct.

As a further improvement, the air inlet direction of the air inlet duct and the axis direction of the air inlet duct form 90 degrees.

As the utility model discloses further improve, rotatory spin-dry a section of thick bamboo that spin-dries the mechanism drive rotatoryly by rotary drive mechanism.

As a further improvement, the air outlet duct is extended upwards by the gas-liquid separation channel and has an air outlet on the upper part of the air outlet duct.

3. Advantageous effects

Adopt the technical scheme provided by the utility model, compare with existing well-known technique, have following apparent effect:

(1) the utility model discloses a speed-increasing type following current rotation spray formula gas scrubbing tower, the gas that its draught fan introduced in to the air inlet duct blows from top to bottom, form the design of following current fluid, gas flow resistance has been reduced, gas flow velocity has been improved, and be equipped with the rotatory spray mechanism who is used for the rotatory spraying of atomizing in the air inlet duct, utilize the mode of the rotatory spraying of atomizing to replace traditional static filler, because the following current design, spray liquid can atomize more meticulous, the effective contact of spray liquid and gas has been increased, reach the reinforcing reaction dynamics, shorten reaction time, reduce the purpose in reaction space; the lower part of the air inlet duct replaces a traditional static louver demister through a rotary drying mechanism, the gas flow velocity is reduced without enlarging the volume, the gas dehumidification effect is better, water mist can be discharged quickly, quick gas-liquid separation is realized, the escape of spraying liquid mist drops is effectively avoided, and a series of problems of insufficient reaction, low gas flow velocity, high gas emission moisture content, huge tower body structure size and the like of the existing washing tower are fundamentally solved;

(2) the utility model discloses a speed-up downstream rotation spray-type gas washing tower, its rotatory spray mechanism include spray liquid center tube and with spray liquid center tube be linked together, along the vertical direction of height of air inlet duct set up a plurality of shower nozzle groups, the shower nozzle group is high-speed rotatory under the jet reaction force effect of atomizing nozzle, need not extra rotary power, simple structure is compact; besides, each group of spray head groups are coaxially provided with propellers which rotate along with the corresponding spray head groups and rotate with downward attack angles, so that the atomization degree and the coverage range of atomized jet flow are increased, the turbulence degree is enhanced, the dynamic reaction surface area is increased, the resistance in the treatment process is reduced, and the air flow speed is increased;

(3) the utility model discloses a speed-increasing downstream rotation spray-type gas washing tower, its spray liquid center tube is evenly equipped with two sets of shower nozzle groups and more than two along the circumferencial direction on same high position, and the shower nozzle group on the adjacent high position has certain stagger angle, makes the spray liquid disperse more evenly after atomizing in the air inlet duct, has further improved the effective contact reaction surface area of gas and spray liquid, improves reaction efficiency;

(4) the utility model discloses a speed-increasing type following current rotation fountain gas washing tower, owing to adopt the following current design to reduce the gas flow resistance, so the draught fan can adopt axial fan, has the advantage of big amount of wind low wind pressure, under equal flow, power consumption descends by a wide margin, energy-conserving effect is obvious;

(5) the utility model discloses a rotatory fountain gas washing tower of acceleration type following current, the velocity of flow that contains dirty air current in every working process of induced air, mixture and separation constantly by the acceleration rate, also is strengthening the function of each in-process simultaneously, finally reaches the purpose of high-speed, high quality air-purifying flow.

Drawings

Fig. 1 is a schematic structural view of a speed-increasing downstream rotary spray-type gas scrubber of the present invention.

The reference numerals in the schematic drawings illustrate:

1. an air inlet duct; 1-1, an air inlet; 2. an induced draft fan; 3. a rotary spraying mechanism; 3-1, spraying a liquid central pipe; 3-2, atomizing nozzles; 3-3, a propeller; 4. a rotary spin-drying mechanism; 5. a gas-liquid separation channel; 5-1, collecting and discharging a spraying liquid; 6. an air outlet duct.

Detailed Description

Compared with all the existing air purification technologies, almost all the air purification technologies achieve the purpose of improving the treatment quality by sacrificing the flow rate and the treatment air volume. For example, filtration techniques, can only improve the quality of treatment by increasing the density of the filter media at the expense of passively increasing the wind resistance, sacrificing wind speed; for example, electrostatic adsorption purification technology can improve the treatment quality only at low wind speed, and the cost is actively increasing the volume, expanding the sectional area and prolonging the action distance, so as to reduce the wind flow speed, and increase the action area and the treatment time. And the utility model discloses a rotatory fountain gas washing tower of acceleration type following current has the characteristic that flows with higher speed, utilizes the high wind speed to reach the purpose that improves the purification air current quality, also must produce comprehensive effects such as the flow and the quality of complete different air purification.

For a further understanding of the present invention, reference will be made to the following detailed description taken in conjunction with the accompanying drawings and examples.

Examples

Referring to fig. 1, the speed-increasing downstream rotary spraying type gas washing tower of the present embodiment includes a vertically disposed air inlet duct 1, and an induced draft fan 2 capable of inducing air into the air inlet duct 1, different from the existing gas washing tower, the induced draft fan 2 blows air introduced into the air inlet duct 1 from top to bottom, a rotary spraying mechanism 3 for atomizing rotary spraying is disposed in the air inlet duct 1, the blowing direction of the contaminated gas is the same as the water flow direction of the rotary spraying mechanism 3, thereby reducing gas flow resistance, increasing gas flow speed, creating conditions for improving the collision and contact of atomized liquid particles and gas fluid by introducing other means without increasing wind resistance, atomizing and spraying by using the rotary spraying mechanism 3, increasing turbulence degree, strengthening collision and mixing effect, and not increasing the sectional area of the air inlet duct 1, the purposes of enhancing the reaction force, shortening the reaction time and reducing the reaction space are achieved; and the atomized liquid particles of the rotary spraying mechanism 3 are equivalent to dynamic packing, so that the collision probability of gas and liquid phases is increased, and the gas-liquid mixing effect is obviously higher than that of the traditional static packing. The lower part of the air inlet duct 1 is provided with a rotary drying mechanism 4 for gas-liquid separation, the specific gravity difference between liquid drop particles and gas can be increased and amplified by using a rotary drying barrel of the rotary drying mechanism 4, liquid components can be rapidly separated from the gas under the comprehensive action of centrifugal force and gravity, gas drying is realized, the moisture content of the gas is reduced, and the escape of spray liquid mist drops is effectively avoided. The bottom of a rotary spin-drying cylinder of the rotary spin-drying mechanism 4 is provided with a gas-liquid separation channel 5, the gas-liquid separation channel 5 is communicated with an air outlet channel 6, the bottom of the gas-liquid separation channel 5 is provided with a spray liquid collecting and discharging port 5-1, liquid separated by the rotary spin-drying mechanism 4 enters the gas-liquid separation channel 5, the liquid is sent into a discharging system from the spray liquid collecting and discharging port 5-1, and separated clean gas enters the air outlet channel 6 through the gas-liquid separation channel 5 and then is discharged. The gas washing tower adopting the structure fundamentally solves a series of problems of insufficient reaction, low gas flow rate, high gas emission moisture content, huge tower body structure size and the like of the existing washing tower.

As shown in fig. 1, in this embodiment, the above-mentioned rotary spraying mechanism 3 includes a central spraying liquid pipe 3-1 and a plurality of nozzle groups communicated with the central spraying liquid pipe 3-1 and arranged along the vertical height direction of the air intake duct 1, the central spraying liquid pipe 3-1 extends into the air intake duct 1 for providing high-pressure spraying liquid to the nozzle groups, a plurality of atomizing nozzles 3-2 are distributed on each nozzle group along the axial circumference of the nozzle rotation shaft, the spraying direction of each atomizing nozzle 3-2 is parallel to the rotation tangential direction and forms a certain downward angle with the rotation tangential direction, that is, the spraying direction is downward along the rotation tangential direction, the nozzle groups rotate at high speed under the action of the spraying reaction force of the atomizing nozzles 3-2, no additional rotational power is needed, and the structure is simple and compact. And each group of spray head groups are coaxially provided with propellers 3-3 rotating along with the corresponding spray head group, the rotating attack angle of the propellers 3-3 is downward, and the propellers 3-3 are driven by the spray head groups to rotate at high speed by utilizing the design of the propellers 3-3, so that the atomization degree and the coverage range of atomized jet flow are increased, the turbulence degree is strengthened, the dynamic reaction surface area is increased, the resistance in the treatment process is reduced, and the air flow speed is increased. As a preferred embodiment, two or more groups of spray heads are uniformly arranged at the same height position of the central spray liquid pipe 3-1 along the circumferential direction, and the spray heads at adjacent height positions have a certain staggered angle, for example, four groups of spray heads are arranged at each layer, and the spray heads at adjacent layer high positions are staggered at an included angle of 45 degrees, so that the spray liquid is dispersed more uniformly after being atomized in the air inlet duct 1, the effective contact reaction surface area of gas and the spray liquid is further improved, and the reaction efficiency is improved.

The speed-increasing downstream rotation spray type gas washing tower of the embodiment reduces gas flow resistance by adopting a downstream design, so that the draught fan 2 can be a low-air-pressure fan, if in the embodiment, the draught fan 2 adopts an axial-flow fan, and the draught fan 2 is arranged at the upper air inlet 1-1 of the air inlet duct 1, so that the speed-increasing downstream rotation spray type gas washing tower has the advantages of large air volume and low air pressure, the power consumption is greatly reduced under the same flow, and the energy-saving effect is obvious. In addition, as shown in fig. 1, the direction of the air inlet 1-1 of the air inlet duct 1 and the axial direction of the air inlet duct 1 form 90 degrees, which is convenient for the installation and arrangement of the induced draft fan 2. In the embodiment, the rotary spin-drying barrel of the rotary spin-drying mechanism 4 is driven to rotate by the rotary driving mechanism, if the rotary spin-drying barrel is driven by a motor, the principle of the rotary spin-drying barrel is similar to that of a spin-drying barrel of a washing machine, heavy liquid in a gas-liquid mixture flows downwards by using the centrifugal force, gas-liquid quick separation is realized, and the drying level of purified gas is improved. The air outlet duct 6 extends upward from the gas-liquid separation channel 5, and an air outlet is arranged at the upper part of the air outlet duct 6, and the purified air flow is discharged upward through the air outlet of the air outlet duct 6.

In the speed-increasing downstream rotation spray-type gas washing tower of the embodiment, the gas flow purification process aims at increasing speed and enhancing the reaction degree continuously, so that the flow density is increased greatly, the volume of a washing tower system is reduced greatly, and the power consumption is reduced greatly. Due to the efficient dynamic spin-drying mechanism, high efficiency, high flow and high separation quality of gas-liquid separation of the purified air flow are guaranteed, so that the front-end spraying mechanism can be completely designed according to high flow, high atomization degree and high mixing efficiency, the occupied volume and flow resistance of gas-liquid separation do not need to be increased, and conditions are created for finally improving the treatment of large-flow air flow and obtaining high-quality purification effect. Referring to fig. 1, in operation, an induced draft fan 2 (such as an axial flow fan) induces air into a dirty air flow (such as acid mist and dust dissolved in water) to be treated to enter an air inlet duct 1, and the air flow flows from top to bottom; spraying water is pumped into the spraying liquid central pipe 3-1 by a water pump and is distributed to the atomizing nozzles 3-2 of each rotary nozzle, and when the atomizing nozzles 3-2 spray atomizing jet flows, reaction force is generated to form rotary torque to drive the rotary nozzles to rotate at high speed; the propeller 3-3 fixed on the rotating shaft of the rotary nozzle rotates at a high speed along with the rotating shaft, on one hand, the rotating propeller 3-3 increases the turbulence degree of the airflow and further strengthens the collision mixing reaction mechanism of the gas-liquid two-phase flow, on the other hand, the propeller 3-3 drives the airflow to flow downwards in an accelerated manner, so that the polluted airflow and the water mist are fully mixed. The liquid and gas mixed fluid is separated by a rotary spin-drying barrel of a rotary spin-drying mechanism 4 rotating at a high speed, the purified air flow is upwards exhausted out of the system through an air outlet duct 6, and the water flow and the adsorbed pollutants are exhausted out of the system through a spray liquid collecting and exhausting port 5-1 below the system. Thus, the air flow purification emission, the pollutant transfer and the pollutant collection are completed.

The utility model discloses a rotatory fountain gas washing tower of acceleration type following current, the velocity of flow that contains dirty air current in every working process of induced air, mixture and separation constantly by the acceleration rate, also is strengthening the function of each in-process simultaneously, finally reaches the purpose of high-speed, high quality air-purifying flow. Compared with the traditional gas washing tower, the method has the following advantages:

1) the designed spray atomization accelerating airflow direction is consistent with the direction of the dirty airflow, so that the turbulence degree is increased, the collision and mixing effect is enhanced, and the airflow flowing speed is increased, so that a large-flow low-wind-pressure fan can be selected, and the possibility of taking an axial flow fan as a draught fan is realized. Compared with other air purification technologies, the rotary drying system has the advantages that power consumption is greatly reduced under the same flow rate, and the energy-saving effect is obvious.

2) The processing links such as gas introduction, gas-liquid mixing, gas-liquid separation and the like are all completed in high-speed movement, and the high-speed movement characteristic of the fluid creates a precondition for reducing the volume of equipment and increasing the flow of the processing gas.

3) The rotary atomizing nozzle and the synchronously rotating propeller are introduced as dynamic fillers, so that the mixing collision chance between the two-phase fluid and the two streams of fluid is increased, the gas-liquid mixing efficiency is improved, the gas flow resistance is not increased in the mixing process, and the gas flow is accelerated to a certain extent.

4) The gas-liquid separation adopts a centrifugal mechanism of a high-speed rotating spin-drying cylinder, the separation flow rate is higher than that of a static demister, the air flow purification quality is higher, and the moisture content of the discharged air flow is greatly reduced.

5) The whole process of airflow treatment is in a low-wind resistance or no-wind resistance state, so that on the premise of obtaining the same airflow purification quality, the flow velocity is faster, the flow density is improved, and the comprehensive effects of lower power consumption, smaller equipment volume and larger treatment air volume are obtained.

The present invention and its embodiments have been described above schematically, and the description is not intended to be limiting, and what is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, if the person skilled in the art receives the teaching of the present invention, without creatively designing the similar structural modes and embodiments to the technical solutions, they should belong to the protection scope of the present invention.

Claims

1. The utility model provides a rotatory fountain gas washing tower of acceleration type following current, includes air inlet duct (1) of vertical setting, draught fan (2) that can be to induced air in air inlet duct (1), its characterized in that: draught fan (2) blow by from top to bottom to the gas of introducing in air inlet duct (1), air inlet duct (1) in be equipped with the rotatory mechanism (3) that sprays that is used for atomizing, the lower part of air inlet duct (1) be equipped with the rotatory mechanism (4) that spin-dries that is used for gas-liquid separation, the rotatory bottom of spin-drying of mechanism (4) of spin-drying be equipped with gas-liquid separation passageway (5), gas-liquid separation passageway (5) be linked together with air outlet duct (6), and the bottom of gas-liquid separation passageway (5) is equipped with and sprays liquid and collect discharge port (5-1).

2. An accelerated co-current rotating spray gas scrubber as recited in claim 1, wherein: the rotary spraying mechanism (3) comprises a spraying liquid central pipe (3-1) and a plurality of spray head groups which are communicated with the spraying liquid central pipe (3-1) and are arranged along the vertical height direction of the air inlet duct (1), a plurality of atomizing nozzles (3-2) are distributed on each group of spray head groups along the axial circumference of a spray head rotating shaft, the spraying direction of each atomizing nozzle (3-2) is parallel to the direction of a rotary tangent and forms a certain oblique lower angle with the direction of the rotary tangent, and the spray head groups rotate at a high speed under the action of the spraying reaction force of the atomizing nozzles (3-2).

3. An accelerated co-current rotating spray gas scrubber as recited in claim 2, wherein: each group of spray head groups are coaxially provided with propellers (3-3) rotating along with the corresponding spray head group, and the rotating attack angle of the propellers (3-3) is downward.

4. An accelerated co-current rotating spray gas scrubber according to claim 2 or 3, wherein: two or more groups of spray head groups are uniformly arranged on the same height position of the spray liquid central pipe (3-1) along the circumferential direction, and the spray head groups on the adjacent height positions have a certain staggered angle.

5. An accelerated co-current rotating spray gas scrubber as recited in claim 1, wherein: the draught fan (2) adopts an axial flow fan, and the draught fan (2) is arranged at an air inlet (1-1) at the upper part of the air inlet duct (1).

6. An accelerated co-current rotating spray gas scrubber as recited in claim 5, wherein: the direction of the air inlet (1-1) of the air inlet duct (1) and the axial direction of the air inlet duct (1) form 90 degrees.

7. An accelerated co-current rotating spray gas scrubber as recited in claim 1, wherein: the rotary spin-drying barrel of the rotary spin-drying mechanism (4) is driven to rotate by the rotary driving mechanism.

8. An accelerated co-current rotating spray gas scrubber as recited in claim 1, wherein: the air outlet duct (6) extends upwards from the gas-liquid separation channel (5), and an air outlet is arranged at the upper part of the air outlet duct (6).