KR102490730B1 - Chemical Cleaning Deodorizer - Google Patents

Abstract

The present invention relates to a chemical cleaning and deodorizing device. The chemical cleaning and deodorizing device, according to the present invention, comprises: a blowing fan (10); a replaceable rapid mixing line device (20); a first vortex-type specific gravity difference gas-liquid separation device (30); and a second vortex-type specific gravity difference gas-liquid separation device (40). According to the present invention, the efficiency of removing malodor can be increased.

Description

Chemical cleaning deodorizer {Chemical Cleaning Deodorizer}

The present invention relates to a chemical cleaning and deodorizing device capable of realizing miniaturization by applying a replaceable rapid mixing line, increasing the efficiency of odor deodorization and actively responding to changes in the richness of odor.

In general, odors are mostly caused by a mixture of various acidic, basic, or neutral odor-causing substances such as ammonia, hydrogen sulfide, and aldehydes, rather than simply generated by one odorous substance.

Conventional chemical cleaning and deodorizing devices spray two or more chemical or biological liquids in a direction opposite to the inflow direction of the odor using a spray nozzle to induce contact with a substance that causes odor, thereby neutralizing the odor or removing it through an oxidative decomposition reaction. When using different chemical liquids, separate contact reaction space is provided according to the type of chemical liquid so that chemical liquids with different properties are not mixed and recovered, and each recovered chemical is recirculated and sprayed again for operation, and the chemical is circulated. It is a general method to operate the chemical cleaning and deodorizing device by replacing the odor deodorization performance with deodorizing performance during reuse or by replacing a new chemical after reusing for a certain period of time.

Therefore, it is a method of separately installing and operating chemical cleaning and deodorizing devices as many as the number of drugs in order to collect and reuse each drug separately without mixing different chemical solutions, but this increases the space for installing the chemical cleaning and deodorizing devices and consumes There is a problem of high power and maintenance costs, and a technology is applied to prevent the number of times that chemicals are mixed by configuring one chemical liquid cleaning and deodorizing device in multiple stages. Mixed recovery and replacement frequently occur.

In addition, if the chemical cleaning and deodorizing device is configured in multiple stages, the installation height of the chemical cleaning and deodorizing device increases in order to secure contact time with chemicals, which causes economic or visual burdens.

Above all, there is a problem in that odor substances that do not react with chemicals are released outside without permission, although there are odor substances that are removed by reacting various mixed odor substances with chemicals. In addition, the odor is not constantly generated from the odor source, but the concentration varies depending on environmental factors such as temperature, humidity, and seasonal changes. Therefore, when a high concentration of odor is introduced in preparation for the deodorizing capacity and performance of the previously designed chemical cleaning and deodorizing device, the already installed chemical cleaning and deodorizing device does not flexibly respond to the intensification change of the odor, and the odor from the chemical cleaning and deodorizing device remains intact. There was a problem that was released and caused civil complaints.

Republic of Korea Patent Registration No. 10-2093121 (Announced on March 26, 2020) Republic of Korea Patent Registration No. 10-0989563 (Announced on October 25, 2010)

The present invention is to solve the above problem, and an object of the present invention is to increase the efficiency of odor deodorization and actively respond to changes in odor by miniaturizing a chemical cleaning and deodorizing device by applying a replaceable rapid mixing line.

In addition, another object of the present invention is to react two or more chemicals in separate spaces to remove mixed odorous substances that cause odor, and to separately recover the used chemicals without mixing.

In order to achieve the above object, the present invention includes a blowing fan for blowing odorous substances; a replacement type rapid mixing line device for rapidly mixing the odorous substances blown from the blowing fan by pumping and spraying the first chemical stored in the first chemical tank; a first vortex-type specific gravity difference gas-liquid separator for separating gas-liquid by pumping and spraying the second chemical stored in the second chemical tank from the chemical liquid droplets that have passed through the replaceable rapid mixing line device; a second vortex-type specific gravity difference gas-liquid separator for separating gas-liquid by pumping and spraying the time-constant water stored in the time-constant water tank from the chemical liquid droplets that have passed through the first vortex-type specific gravity difference gas-liquid separator; wherein the chemical solution supplied from the first motor pump of the first chemical tank is recovered to the first chemical tank through the first discharge pipe, and the chemical solution supplied from the second motor pump of the second chemical tank is returned to the second chemical tank. It is characterized by providing a chemical cleaning and deodorizing device for recovering the chemical liquid to the second chemical tank through the discharge pipe and recovering the time constant supplied from the third motor pump of the time constant tank to the time constant tank through the third discharge pipe.

In addition, in the present invention, in the replacement type rapid mixing line device, the odor inlet pipe and the first supply pipe connected to the first motor pump may be coupled with flanges, respectively.

In addition, in the present invention, the first vortex-type specific gravity difference gas-liquid separator includes a first inclined plate having a certain angle of inclination, fixedly installed on the first inclined plate, and odor substances introduced through the replaceable rapid mixing line device A first spiral structure that separates gas and liquid by vortex rotation, and an agent installed on the first spiral structure to spread odorous substances widely and to block chemical liquid falling from the top from flowing into the first spiral structure It may include a first flow guide plate, a polling installed on top of the first spiral structure, and a second spray nozzle spraying the second medicine stored in the second medicine tank at the top of the polling.

In addition, in the present invention, the second vortex-type specific gravity difference gas-liquid separator is introduced through a second swash plate having a certain angle of inclination and fixedly installed on the second swash plate and passing through the first vortex-type specific gravity difference gas-liquid separator A second spiral structure that separates gas and liquid by vortex-rotating the odorous substances, and is installed on the second spiral structure to spread the odorous substances widely and prevent the liquid falling from the top from flowing into the second spiral structure It may include a second flow guide plate for blocking and a third spray nozzle installed on the upper portion of the second spiral structure to spray the time constant water stored in the time constant tank.

In addition, in the present invention, a demister or an eliminator may be installed on the upper part of the second vortex type specific gravity difference gas-liquid separator.

Further, in the present invention, a deodorizing liquid spraying device for spraying and capturing the deodorizing liquid on the odorous substances separated in the second vortex-type specific gravity difference gas-liquid separator may be further included.

In addition, in the present invention, a backflow prevention member may be installed in the deodorizing liquid spraying device to prevent gaseous substances from entering.

According to the present invention, two or more chemicals are reacted in a separate space to remove various mixed odor substances that cause odor, and the input chemicals can be separately recovered without being mixed, and through a replaceable rapid mixing line It has the advantage of reducing costs by increasing the efficiency of removing odors by accelerating reactions with odorous substances and responding to changes in load due to the inflow of odorous substances, and reducing the size of the chemical cleaning and deodorizing device.

1 is a configuration diagram showing a chemical cleaning and deodorizing device according to an embodiment of the present invention.
2 is a configuration diagram showing a replacement type rapid mixing line device in the liquid chemical cleaning and deodorizing device according to the present invention.
3 is a configuration diagram showing a spiral structure of a vortex-type specific gravity difference gas-liquid separator in the chemical cleaning and deodorizing device according to the present invention.
4 is a configuration diagram showing a deodorizing liquid spraying device in a chemical cleaning deodorizing device according to the present invention.
5 is a flow chart showing the operation of the liquid chemical cleaning and deodorizing device according to the present invention.

Hereinafter, an embodiment of a liquid chemical cleaning and deodorizing device according to the present invention will be described in detail with reference to the accompanying drawings.

In FIG. 1, the blowing fan 10 blows odorous substances, and blows air into the deodorization tower 1 for cleaning odorous substances, which are objects to be deodorized. The blowing fan 10 is installed outside the deodorization tower 1.

In the lower part of the deodorizing tower 1, a first chemical tank 2 and a second chemical tank 4 are installed to store the corresponding chemicals, and a time constant tank 6 to store the time constant is installed. The first chemical tank 2, the second chemical tank 4, and the time constant tank 6 are separately installed. A first motor pump (3) is installed in the first chemical tank (2) to supply the first chemical through a first supply pipe (21), and a first discharge pipe (23) connected to a replaceable rapid mixing line device (20) Through this, the first drug deodorizing the odorous substance is recovered. A second motor pump (5) is installed in the second chemical tank (4) to supply the second chemical through a second supply pipe (34), and a second discharge pipe connected to the first vortex type specific gravity difference gas-liquid separator (30). Through (36), the second drug deodorizing the odorous substance is recovered. In addition, a third motor pump 7 is installed in the time constant tank 6 to supply time constant through a third supply pipe 44, and a third discharge pipe 46 connected to the second vortex type specific gravity difference gas-liquid separator 40 Recovers the time constant deodorized by odorous substances.

In FIG. 2 , the replacement type rapid mixing line device 20 pumps and sprays the first chemical stored in the first chemical tank 2 to the odor substance blown from the blowing fan 10 to rapidly mix the odor substance first. is to remove The replacement type rapid mixing line device 20 is installed on one side of the outside of the deodorization tower 1 and is installed in the odor inlet pipe 11 connected to the blowing fan 10. In addition, the replacement type rapid mixing line device 20 is connected to the first motor pump 3 installed in the first chemical tank 2 and the first supply pipe 21. In the replacement type rapid mixing line device 20, the odor inlet pipe 11 and the first supply pipe 21 are coupled with flanges 12, respectively, to make it easy to attach and detach.

The first vortex-type specific gravity gas-liquid separator 30 is installed on the first chemical tank 2 of the deodorization tower 1. The first vortex type specific gravity difference gas-liquid separator 30 pumps and sprays the second chemical stored in the second chemical tank 4 from the chemical liquid droplets that have passed through the replaceable rapid mixing line device 20 to separate the gas-liquid and odorous substances is to remove the second. The first vortex type specific gravity difference gas-liquid separator 30 is installed on the first inclined plate 32 that divides the deodorization tower 1 approximately horizontally and seals it. The first swash plate 32 is inclined at a certain angle, and the second medicament that is sprayed and dropped and the odor substance separated from the gas-liquid are discharged from the outlet part inclined downward of the first swash plate 32 to the second discharge pipe 36. Through this, it is recovered to the second chemical tank (4). The first spiral structure 31 is fixedly installed on the first inclined plate 32, and separates gas and liquid by vortex-rotating the odorous substances introduced through the replaceable rapid mixing line device 20. In FIG. 3 , the first spiral structure 31 is spirally formed in a substantially conical shape. The chemical solution in the state of fine droplets included in the gaseous malodorous substance has a higher specific gravity than the gaseous substance. Therefore, when the odor substances introduced from the lower portion of the first spiral structure 31 flow into the spiral space forming the vortex, the odor substances are separated into gas and liquid while rotating and rising, so that the gas rises and the liquid descends. Therefore, it is prevented from mixing with other chemicals by preventing the rising of the liquid containing the odorous substances.

In addition, the first flow guiding plate 33 is installed on the first spiral structure 31 to spread odorous substances widely and blocks the chemical liquid falling from the top from flowing into the first spiral structure 31 . Moreover, when the malodorous substance is discharged in the form of a vortex at the spiral end of the first spiral structure 31, it is installed at a predetermined interval from the spiral end. The upper portion of the first flow guide plate 33 has a substantially flat hat shape and is larger than the diameter of the first spiral structure 31 . Odor substances passing through the first spiral structure 31 collide with the bottom surface of the first flow guide plate 33 to spread widely while maintaining the shape of the vortex, and to the edge of the first flow guide plate 33 at a certain angle. The bent part descends to the floor, which is the opposite direction of the flow of odorous substances, and then rises again to induce the odorous substances to spread evenly in the first vortex-type specific gravity difference gas-liquid separator 30, and the polling 37 installed on the upper part allow it to flow into. In addition, the first flow guide plate 33 increases the chance of contact with the chemical liquid sprayed from the second spray nozzle 35 to promote reactivity. In addition, the first flow guide plate 33 has a function of inducing a flow of odorous substances, and the chemical solution sprayed from the second spray nozzle 35 and falling is transferred to the first vortex type specific gravity difference gas-liquid separator 30. It also serves to prevent mixing with the chemical liquid stored in the first chemical tank 2 by blocking the inflow into the spiral structure 31 .

A Pall Ring (37) is installed on top of the first spiral structure (31). Polling 37 is a charging of a plurality of scrubbers. In the polling 37, the chemical liquid sprayed from the second injection nozzle 35 forms a film to form a thin double film on the contact surface of the chemical liquid, through which odorous substances are moved and absorbed into the chemical liquid. Therefore, the wider the contact area of the material moving through the dura mater, the better the poling 37 is. The second injection nozzle 35 is installed on top of the polling 37. The second injection nozzle 35 is connected to the second supply pipe 34, and the second chemical supplied from the second motor pump 5 of the second chemical tank 4 through the second supply pipe 34 is polled 37 ) spray upwards.

The second vortex-type specific gravity difference gas-liquid separator 40 is installed on the first vortex-type specific gravity difference gas-liquid separator 30 . The second vortex-type specific gravity difference gas-liquid separator 40 pumps and sprays the time constant stored in the time-constant water tank 6 from the chemical liquid droplets that have passed through the first vortex-type specific gravity difference gas-liquid separator 30 to separate gas-liquid and remove odorous substances. to be removed in three steps. The second vortex type specific gravity difference gas-liquid separator 40 is installed on the second inclined plate 42 that divides the deodorization tower 1 approximately horizontally and seals it. The second inclined plate 42 is inclined at a certain angle, and the odorous substances from which the sprayed and fallen time constant and the gas-liquid are separated are passed through the third discharge pipe 46 from the downwardly inclined outlet part of the second inclined plate 42. It is returned to the time constant tank (6). The second spiral structure 41 is fixedly installed on the second inclined plate 42, and separates gas and liquid by vortex-rotating the odorous substances introduced through the first vortex-type specific gravity difference gas-liquid separator 30. The second spiral structure 41 is spirally formed in a substantially conical shape. When the malodorous substances introduced from the lower portion of the second spiral structure 41 flow into the spiral space forming the vortex, the malodorous substances are separated into gas and liquid while rotating and rising, so that the gas rises and the liquid descends. Therefore, it is prevented from mixing with other chemicals by preventing the rising of the liquid containing the odorous substances.

In addition, the second flow guiding plate 43 is installed on the second spiral structure 41 to spread odorous substances widely, and blocks the chemical solution falling from the top from flowing into the second spiral structure 41 . Moreover, when the odorous substance is discharged in the form of a vortex at the spiral end of the second spiral structure 41, it is installed at a predetermined interval from the spiral end. The upper part of the second flow guide plate 43 has a substantially flat hat shape and is larger than the diameter of the second spiral structure 41 . The odorous substances passing through the second spiral structure 41 hit the bottom surface of the second flow guide plate 43 to spread widely while maintaining the shape of the vortex, and to the edge of the second flow guide plate 43 at a certain angle. The bent part descends to the floor, which is the opposite direction of the flow of odorous substances, and then rises again to induce the odorous substances to spread evenly in the second vortex-type specific gravity difference gas-liquid separator 40, so that the demister or eliminator installed at the top Allow it to flow into the minator. In addition, the second flow guide plate 43 increases the chance of contact with the time constant sprayed from the third spray nozzle 45 so that the reactivity is promoted. In addition, the second flow guide plate 43 has a function of inducing a flow of odorous substances, and the time constant of spraying from the third spray nozzle 45 and falling is the second vortex type specific gravity difference gas-liquid separator 40. It also serves to prevent mixing with the chemical liquid stored in the second chemical tank (4) by blocking the inflow into the spiral structure (41).

A demister (47) is installed on the upper part of the second vortex type specific gravity difference gas-liquid separator (40). The demister 47 is accumulated according to the density of each style after corrugating at regular intervals woven with a session whose surface is lubricated, causing a complex inertial collision. That is, when the gas generated from the liquid changes into bubbles and rises, the surface is ruptured to generate fine particles of the liquid, and when the gas is accompanied and passes through the demister 47, the fine particles before passing through the pad surface Since this increases, particles containing foreign substances naturally fall due to their own weight, and the gas or gas containing liquid components passing through the demister 47 allows pure gas from which impurities are completely removed to go out to the top of the demister 47. Therefore, when the demister 47 is destroyed by gas bubbles on the surface of the liquid and the generated mist is reached by the flow of gas, the fine particles of the mist cause inertial collision at the wire part of the pad, and the colliding particles aggregate with each other to reduce the volume. It is to be recovered at the same time as the increase.

In addition, an eliminator may be installed instead of the demister. The eliminator is a zigzag-shaped obstruction plate that arranges zigzag-folded plates side by side at narrow intervals and removes water droplets when air or gas passes through the gap. It can be manufactured and applied in various forms.

In FIG. 4 , the deodorizing liquid spraying device 50 sprays and captures the deodorizing liquid on the odorous substances separated in the second vortex-type specific gravity gas-liquid separator 40 to perform fourth deodorization. The deodorizing liquid spraying device 50 is responsible for load fluctuations caused by the inflow of odorous substances, such as deodorization efficiency being lowered due to high concentration of odorous substances introduced through the demister 47 or inflow of odorous substances that do not react with the chemical solution. It is a device for responding. Therefore, the deodorizing liquid spraying device 50 is a device that operates when a load fluctuation occurs due to the inflow of odorous substances. The deodorizing liquid spray device 50 has a deodorizing liquid storage tank 51 in which deodorizing liquid is stored, and the deodorizing liquid from the deodorizing liquid storage tank 51 passes through the fourth spray nozzle 53 installed in the spray pipe 52. It is sprayed into the deodorization tower (1). At this time, a deodorizing liquid serving to shield the odorous substance is used to capture the odorous substance and prevent it from being released to the outside. In addition, a backflow prevention member 54 is installed to prevent gaseous substances from flowing into the deodorizing liquid spraying device 50 from the deodorizing tower 1 when the deodorizing liquid spraying device 50 is not in operation.

In addition, a control panel 60 is installed to operate and control the liquid chemical cleaning and deodorizing device according to the present invention. The control panel 60 controls and monitors the overall operation of the chemical liquid cleaning and deodorizing device.

Next, the operation of the liquid chemical cleaning and deodorizing device according to the present invention will be described with reference to the flowchart of FIG. 5 .

In FIG. 5 , odor substances, which are objects to be deodorized, are supplied from the blowing fan 10 to the replaceable rapid mixing line device 20 through the odor inlet pipe 11 (S1). At this time, the first motor pump 3 of the first chemical tank 2 supplies the stored first chemical to the replaceable rapid mixing line device 20 through the first supply pipe 21 to supply the first spray nozzle 22 ) to be sprayed (S2). In the replacement type rapid mixing line device 20, after the first deodorization is performed with the first chemical, the malodorous substance is introduced into the first vortex-type specific gravity difference gas-liquid separator 30 through the first discharge pipe 23 (S3).

When the firstly deodorized odorous substances flow into the first vortex-type specific gravity difference gas-liquid separator 30, the second chemical is supplied from the second chemical tank 4 to the first vortex-type specific gravity difference gas-liquid separator 30 It is sprayed through the second spray nozzle 35 (S4). The first vortex type specific gravity difference gas-liquid separator 30 secondarily deodorizes odorous substances with a second chemical (S5). Further, the gas-liquid contact is increased by the polling 37 installed in the first vortex-type specific gravity difference gas-liquid separator 30 (S6).

When secondarily deodorized odor substances flow into the second vortex-type specific gravity difference gas-liquid separator 40, the time constant is supplied from the time constant tank 6 to the second vortex-type specific gravity difference gas-liquid separator 40, and the third spray nozzle It is sprayed through (45) (S7). The second vortex-type specific gravity gas-liquid separator 40 thirdly deodorizes odorous substances with a time constant (S8). And the gas-liquid is separated through the demister 47 or the eliminator installed on the second vortex-type specific gravity gas-liquid separator 40 (S9).

In addition, when the concentration of the odorous substance passing through the demister 47 is high or the odorous substance that does not react with the chemical liquid flows in, the deodorizing liquid is sprayed with the deodorizing liquid spraying device 50 so that the fourth deodorization is performed (S10). . When the cleaning and deodorization of the odorous substances is completed in the deodorization tower 1, it is exhausted to the outdoors (S11).

In addition, the chemical liquid cleaning and deodorizing device of the present invention recovers the chemical liquid supplied from the first motor pump 3 of the first chemical tank 2 to the first chemical tank 2 through the first discharge pipe 23, The chemical solution supplied from the second motor pump (5) of the second chemical tank (4) is recovered to the second chemical tank (4) through the second discharge pipe (36), and the third motor pump of the time constant tank (6) The time constant supplied in (7) is recovered to the time constant tank (6) through the third discharge pipe (46).

The embodiment described above in the present invention is an example, and the present invention is not limited thereto. Anything that has substantially the same configuration and achieves the same effect as the technical idea described in the claims of the present invention is included in the technical scope of the present invention.

Reference Numerals 1: deodorization tower 2: first chemical tank 3: first motor pump 4: second chemical tank 5: second motor pump 6: constant water tank 7: third motor pump
10: blowing fan 11: odor inflow pipe 12: flange
20: replacement type rapid mixing line device 21: first supply pipe 22: first injection nozzle 23: first discharge pipe
30: first vortex type specific gravity difference gas-liquid separator 31: first spiral structure 32: first inclined plate 33: first flow guide plate 34: second supply pipe 35: second injection nozzle 36: second discharge pipe 37: polling
40: 2nd vortex type specific gravity difference gas-liquid separator 41: 2nd spiral structure 42: 2nd inclined plate 43: 2nd flow guide plate 44: 3rd supply pipe 45: 3rd injection nozzle 46: 3rd discharge pipe 47: demister
50: deodorant injection device 51: deodorant storage tank 52: injection pipe 53: fourth injection nozzle 54: backflow prevention member
60: control panel

Claims (7)

a blowing fan (10) for blowing odorous substances;
a replacement type rapid mixing line device (20) for rapidly mixing the odorous substances blown from the blowing fan (10) by pumping and spraying the first chemical stored in the first chemical tank (2);
a first vortex-type specific gravity difference gas-liquid separator 30 for separating gas-liquid by pumping and spraying the second chemical stored in the second chemical tank 4 to the chemical liquid droplets that have passed through the replaceable rapid mixing line device 20;
A second vortex-type specific gravity difference gas-liquid separator 40 for separating gas-liquid by pumping and spraying the time constant stored in the time constant tank 6 to the chemical liquid droplets that have passed through the first vortex type specific gravity difference gas-liquid separator 30; including,
The chemical solution supplied from the first motor pump 3 of the first chemical tank 2 is recovered to the first chemical tank 2 through the first discharge pipe 23,
The chemical solution supplied from the second motor pump 5 of the second chemical tank 4 is recovered to the second chemical tank 4 through the second discharge pipe 36,
The chemical cleaning and deodorizing device is such that the time constant supplied from the third motor pump (7) of the time constant tank (6) is recovered to the time constant tank (6) through the third discharge pipe (46).
The method of claim 1, wherein the replacement type rapid mixing line device (20) combines the odor inlet pipe (11) and the first supply pipe (21) connected to the first motor pump (3) with a flange (12), respectively. Chemical liquid cleaning and deodorizing device.
The method of claim 1, wherein the first vortex type specific gravity difference gas-liquid separator 30,
A first inclined plate 32 formed with a certain angle of inclination;
A first spiral structure 31 that is fixed on the first inclined plate 32 and separates gas and liquid by vortex-rotating the odorous substances introduced through the replaceable rapid mixing line device 20;
a first flow guide plate (33) installed on the first spiral structure (31) to spread odorous substances widely and to block chemical liquid falling from the top from flowing into the first spiral structure (31);
A polling 37 installed on the upper part of the first spiral structure 31,
A chemical cleaning and deodorizing device comprising a second injection nozzle (35) for injecting the second chemical stored in the second chemical tank (4) at the top of the polling (37).
The method of claim 1, wherein the second vortex type specific gravity difference gas-liquid separator 40,
A second inclined plate 42 formed with a certain angle of inclination;
A second spiral structure (41) fixedly installed on the second inclined plate (42) and separating gas and liquid by vortex-rotating the odorous substances introduced through the first vortex-type specific gravity difference gas-liquid separator (30);
a second flow guide plate (43) installed on the second spiral structure (41) to spread odorous substances widely and to block chemical liquid falling from the top from flowing into the second spiral structure (41);
A chemical cleaning and deodorizing device comprising a third spray nozzle (45) installed on the second spiral structure (41) and spraying the time constant stored in the time constant tank (6).
The chemical liquid washing and deodorizing device according to claim 1, wherein a demister (47) or an eliminator is installed on the upper part of the second vortex type specific gravity difference gas-liquid separator (40).
The chemical cleaning and deodorizing device according to claim 1, further comprising a deodorizing liquid spraying device (50) for spraying and capturing the deodorizing liquid on the odorous substances separated in the second vortex-type specific gravity difference gas-liquid separator (40).
The chemical cleaning and deodorizing device according to claim 6, wherein the deodorant injection device (50) is provided with a backflow prevention member (54) to prevent gaseous substances from flowing in.

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