DE1933471A1 - Gas with predetermined moisture content for - biological experiments - Google Patents

Abstract

Liquid is separated from moist gas or vapour by passing a stream of the gas vertically through the first of two coolant-contg. tubular cooling chambers connected in series. It is deflected laterally at least 10 mm above the chamber bottom and passed to the bottom end of the second chamber at a distance is not 10 mm from the latter. Thus the stream flows downwards and is then deflected upwards to enter the chamber. It is finally withdrawn from the top of the latter. Separated liquid is withdrawn from both chamber bottoms. Spec. the device is also claimed.

Description

Method and device for the excretion of liquid from moist Gases or vapors In biological examinations there is often the desire to have one To produce a gas flow at a precisely defined temperature, for example in order to which are arranged in gas chambers, with an air flow of a predetermined temperature and to supply the specified moisture content. In such investigations It is now desirable to remove the water vapor content that is interfering with the measurement during gas exchange measurements set to low constant values.

Various devices are already known for this purpose. at In a known embodiment, the gas flow is passed through a metal block which is cooled to a certain dew point using the Peltier effect. The good constancy of the Dew point achieved. Such devices are very expensive to purchase and therefore not available for many examinations due to cost reasons.

A gas cooler is known from German utility model 6 751 238 become, in which in the interior of the cold room, which contains the gas flow to be cooled, arranged a metal tube containing the flow of cooling liquid and the cooling space is surrounded on the outside by a chamber which also contains a flow of cooling liquid. In this known arrangement, the inlet opening of the chamber and the inlet opening are the metal pipe near one end of the gas cooler and the drain hole of the cooling pipe arranged near the other end of the gas cooler.

The present invention relates to an improved modification thereof known cooling method and the gas cooler used for this purpose. It becomes excretion of liquid from moist gases or vapors and for the production of a gas with a predetermined moisture content according to the invention the gas stream to be cooled in the first of at least two series-connected and by a coolant cooled tubular cooling chambers in a vertical direction from top to bottom, ~ Discharged sideways at least 10 mm above the lower end of this cooling chamber and the second tubular cooling chamber near but at least the lower end thereof 10 mm away from this, fed in such a way that it is directed downwards first is. The gas flow to be cooled is then deflected in the upward direction and out the second cooling chamber near its upper end is discharged sideways and in both Cooling chambers, the excreted liquid discharged below.

This ensures that the air is already in the first cooling chamber initially from existing aerosols and most of those to be condensed out Liquid is freed because in addition to the effect of cooling there is still the effect of the Inertia of the liquid particles and the force of gravity favoring the Separation of gas flow and liquid particles acts. In the second cooling chamber When the gas flow to be cooled enters, the effect of inertia is repeated the liquid particles are exploited and then the already largely liquid freed gas flow by gravity acting opposite to the direction of flow freed from the remaining droplets that are precipitated by cooling.

When carrying out the method, it is expedient to use the second cooling chamber to be cooled by a coolant, which at least on a wall the cooling chamber in the direction from top to bottom and then the first cooling chamber is supplied for cooling.

Advantageously, the coolant is through one inside the second Cooling chamber running pipe guided in the area of the upper end of the cooling chamber is provided with a number of fine grooves running from top to bottom. Here it is favorable if the grooves are at an acute angle to the vertical surface lines of the pipe.

In a preferred embodiment, the protrudes to discharge the gas The tube serving from the second cooling chamber into this cooling chamber has a sloping one to the pipe axis running end face and is on the outside near this end face provided with a circumferential, preferably very narrow, groove.

In the following the invention is based on the in the drawings illustrated embodiments described, everything for understanding the Invention unnecessary is omitted. Corresponding parts are denoted by the same numerals in the figures.

It shows: FIG. 1 a gas cooler according to the invention in FIG partially sectioned, FIG. 2 shows a construction detail in a perspective illustration.

The gas cooler shown in Fig. 1 consists of two cooling units A and B. Each cooling unit has an inner tube 1 made of a material that conducts heat well, through which the coolant flows in the direction of arrows 2. This inner tube 1 wearing corrugated on its outside for the purpose of increasing surface area Sheet metal strips 3. There are many such highly thermally conductive sheet metal strips one behind the other arranged that the waves of the individual sheet metal strips are offset from one another. The corrugated sheet metal strips 3 are thermally conductive with the inner tube 1 and the outer tube 5 connected. The ribbed cooling chamber 4a is to be cooled and dried by the Gas in the direction of arrows 6 from top to bottom and the cooling chamber 4b is of Flows through from the bottom to the top.

The gas flowing in the direction of the arrows 6 hits the front edge of the corrugated sheet metal strip 3, is swirled there and thus in particularly effective Brought into contact with the cooling metal surfaces. The following sheet metal strips are as can be seen from Figure 2, arranged such that the waves of the individual sheet metal strips are offset from one another. As a result, the gas stream hits again and again the front edges of the following sheet metal strips and is swirled again in the process.

The gas to be cooled is first supplied to the first cooling unit A via the Connection piece 7 supplied, flows through the ribbed cooling chamber from top to bottom 4a, is sharply deflected at the connection piece 8, thereby giving entrained water droplets due to inertia in the direction of arrow 9 downwards and leaves the first Cooling unit. The condensate obtained during the cooling # of the gas 6 is through the connecting piece 10 discharged.

The gas pre-cooled and pre-dried in the first cooling unit A is now via the connecting line 11 and the connecting piece 12 to the second cooling unit B forwarded. The gas is used for the purpose of further separation of entrained water droplets at the Connection piece 12 sharply deflected, wote any entrained water droplets in Go in the direction of arrow 13 to the bottom of the cooling chamber. The gas flows through the ribbed cooling chamber 4b upwards and leaves it via the connecting piece 14. The condensate accumulating in the cooling unit B is discharged through the connecting piece 15.

The drainage nozzles 10 and 15 are wide enough to prevent blockages in the condensate drain to avoid through meniscus formation. If necessary, pressure equalization can also be used by a connection between line 11 and a condensate collecting tank, not shown here getting produced.

The connection piece 14 for the exiting dried gas is after lengthened on the inside, cut off at an angle and with a surrounding one located near the edge Groove 15 provided so that the condensate that forms in the upper part of the cooling unit does not flow into the outlet connection, but to the inner wall of the ribbed space is discharged. For the same reason, the upper part of the inner tube 1 is with steep grooves 16 provided, due to the capillary action of the formation of larger Counteract water droplets in the vicinity of the opening of the connecting piece 14.

The two cooling units A and B are including the connecting pieces and connecting lines are surrounded by a heat-insulating jacket 17.

In the case of increased requirements, it may be useful to use the one to be cooled moist gas flow or steam through further cooling units of the type A and B lead. It may be advantageous to use a so-called coolant as the coolant Peltier cooler to be provided.

With a device shown in the figures and in connection thus described embodiment, which has an overall height of 175 mm, can 200 liters of steam-saturated air cooled from + 800C to + 0.6 ° G in one hour will. In the temperature range +1000 to + 800G, measured at the cooler inlet, is at a throughput of 200 liters of water vapor-saturated air, the fluctuation of the Water vapor concentration of the air flow at the cooler outlet + 2.2% of the mean value.

With a device of the known, described in utility model No. 6 751 23d Bauart could be built in an hour with the same inner and outer diameter and the same total length of the rest section with the same coolant quantity and coolant temperature 200 liters of water-vapor-saturated air can only be cooled from * 3200 to + 0.6 ° C.

Claims (5)

Claims. / process for separating liquid from moist gases or Steaming and producing a gas with a given moisture content, thereby characterized in that the gas stream to be cooled is in the first of at least two in succession connected and cooled by a coolant tubular cooling chambers (4a, 4b) guided in the vertical direction from top to bottom, at least 10 mm above the lower end of this cooling chamber discharged sideways and the second tubular Cooling chamber near its lower end, but at least 10 mm away from it, is fed in such a way that it is directed first downwards, then in the direction is deflected upwards and sideways from the second cooling chamber near its upper end is discharged, and in both cooling chambers the separated liquid is discharged at the bottom will. 2. Apparatus for performing the method according to claim 1, characterized characterized in that the second cooling chamber (4b) is cooled by a coolant, which at least on one wall of the cooling chamber in the direction from top to bottom and then fed to the first cooling chamber (4a). 3. Apparatus according to claim 2, characterized in that the coolant is passed through a pipe (1) running inside the second cooling chamber, which in the area of the upper end of the cooling chamber with a number from top to bottom running fine grooves (16) is provided. 4. Apparatus according to claim 2 and 3, characterized in that the grooves at an acute angle to the vertical surface lines of the pipe get lost. 5. Apparatus according to claim 2, characterized in that the for Discharge of the gas from the second cooling chamber (4b) serving pipe into this cooling chamber protrudes, has an end face extending obliquely to the pipe axis and on the outside is provided near this end face with a circumferential groove (15). L e r s e i t e