DE2018585A1 - Method and device for defogging and / or drying gases - Google Patents

Description

LINDE SHARES E LLSCHAFT

• 20185a5

(H 588) H 70/29

Sorhn / Kp April 17, 1970

Process and device for defogging and / or drying gases ___

The invention relates to a method and an apparatus for defogging and / or drying gases by cooling and subsequent heating, preferably air for circulating air drying.

The known methods for defogging and / or drying of gases by cooling and subsequent heating, whereby the moisture contained in the gases condenses or freezes out, require a very high energy consumption, especially then when defogging very large amounts of gas and / or too

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^{1 are} drying,

,; ' For example, in a known device for defogging the air in closed factory rooms, the , Air constantly passed through a water cooler and thereby . cooled to the temperature of the cooling water and dehumidified. ■! Then the air is in a heating device with Warmed up by steam. The operation of this known device is continuous except for a large amount running cooling water also requires a high level of power required to generate water vapor. Also is , this known device due to the use of water,! as a coolant to the drying of atmospheric air limited.

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I The ongoing high energy demand is also a disadvantage if

if the air dried in this way is to be used for circulating air drying, either for cold air drying or for hot air drying, since these processes have to be particularly economical.

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The invention is based on the object of a method for

Defogging and / or drying of gases, in particular of i | To develop air for the circulating air drying, in which the

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ongoing energy requirements in a particularly simple way. can be covered.

This object is achieved in that the gas by a Refrigerant evaporator in which moisture contained in the gas is excreted, and then through a refrigerant ^ condenser, in which · the gas above its inlet temperature at the inlet of the refrigerant evaporator heated and thereby transferred into an undersaturated state is passed through, with refrigerant evaporator and Refrigerant condenser parts of a common refrigeration ■ are medium-circulatory.

In the method according to the invention, the refrigerant evaporator continuously kept at such a temperature that the mist or moisture in the form of water .aus condenses or freezes out of the gas and is simultaneously deposited in the refrigerant evaporator. The closed one The refrigerant circuit is with regard to the ■

Refrigerant, the performance of the refrigerant compressor, the cooling capacity of the refrigerant evaporator and the heating capacity of the refrigerant condenser as well as the condition and the amount of gas passing through the refrigerant evaporator so operate.

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The gas leaves the refrigerant evaporator in a dry, saturated state and enters the refrigerant condenser an «This is where the heat of condensation and the performance of the refrigerant compressor are concerned its temperature is warmed up at the inlet of the refrigerant evaporator, whereby the temperature level of the refrigerant condenser given 1st.

According to the inventive method üie temperature of the refrigerant evaporator always is below the temperature of the incoming gas in this and the temperature of the refrigerant VerflUssigers above the temperature of the entering into the refrigerant evaporator gas. In addition, the temperatures of the refrigerant evaporator and the refrigerant condenser and the bridges in them are variable. They adjust themselves depending on the change in state of the incoming gas.

When using the method according to the invention for the Defog, for example from atmospheric air, is no heat is dissipated from the overall system. The gas leaves the refrigerant condenser in the undersaturated state. ' Ee can now be mixed with an additional amount of mist-containing air from the environment, which causes it

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: additional amount of ambient air is defogged.

J When using the method according to the invention for drying Ii of circulating air must be about the work performance of the refrigerant

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Compressor off appropriate amount of heat from the system;: leads are, if recirculation before entering a dry ^r> space should not be additionally heated. This advantageous modification of the method according to the invention is particularly suitable for supplying cold air drying systems with · J i: dry air.

.; ■ Appropriately used in cases where the moisture

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i 'freezes out, two refrigerant evaporators alternating from the;: gas to be defogged and / or to be dried flows through. '■ \ When using this procedure, the momentarily cannot;' refrigerant evaporators through which gas flows are freed of accumulated ice *

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i Further details of the invention are based on the in the * j FIGS. 1 and 2 schematically illustrated exemplary embodiments.

two devices for performing the invention 'Procedure shown.

iiIt shows:

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Fig. T shows a device according to the invention for defogging of atmospheric air,

2 shows a device according to the invention for drying of air for cold air drying.

In Fig. 1, a pipe 7 is shown in which the refrigerant evaporator 1, the refrigerant condenser 2 and a fan 5 for moving the air are arranged. Of the one end of the refrigerant evaporator 1 leads a pipe to the refrigerant compressor 3 arranged outside the pipe 7 and from this a further line to the refrigerant condenser 2. The other end of the refrigerant evaporator 1 is connected to the refrigerant * via the regulating valve 4 Condenser 2 connected.

The low-atmosphere air to be defogged flows through the pipe 7 in the direction of the arrow and has a water content of 0.5 g / n », which corresponds to dense fog. Normal butane gas is used as the refrigerant. At a temperature of the refrigerant evaporator 1 of ⁰ ° C and a temperature of the refrigerant Verflüsßigers 2 of 1O ⁰ C, the mist-containing air of 5 ⁰ C is cooled to 2 ⁰ C and then warmed again at 8 ^P C.

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In this special device according to the invention can For example, 100,000 Nm / h of air can be defogged with a further mist-containing air volume of 300,000 NmVh are mixed, which are thereby additionally defogged. The total defogged air volume is thus 400,000 Nm / h.

There is an energy requirement for the refrigerant circuit

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;! of around 10 kW / h is required, for the operation of the fan one of 15 kW / h. The total energy requirement thus amounts to 22,000 Kcal / h at 400,000 -Nno / h of defogged air, which results in a specific energy requirement of 0.05 Kcal / Nm · ⁵ defogged air. A single-stage turbo compressor is required as a refrigerant compressor> for defogging atmospheric air.

The refrigerant evaporator 1 is advantageously as Corrugated iron heat exchanger. This type of heat exchanger also promotes the separation of the water.

2 shows a heat exchanger 6 arranged between the refrigerant compressor 3 and the refrigerant condenser 2 in front of the inlet of the refrigerant condenser 2. This heat exchanger is required for _{cold air drying; ,, v} to dissipate the work of the refrigerant compressor from the overall system, since in this special drying process the air enters a drying room

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; should not be additionally heated.

I! 7 claims

| i 1 sheet of drawings .-,

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Claims (1)

-8 ~ LINDE AKTIENGESELLSCHAFT (H 588) H 70/29 Schn / Kp. April 17, 1970 Claims 1. A process for steam extraction and / or drying of gases by cooling and subsequent warming, preferably of air for circulating air drying, characterized in that that the gas is excreted through a refrigerant evaporator (1) in which moisture contained in the gas and then through a refrigerant condenser (2), in which the gas is about its temperature at the entrance of the quay « ^! ! temittel evaporator (1) heated out and thereby in a .through it is passed through to the undersaturated state / with refrigerant | ^! Evaporator (1) and refrigerant condenser (2) are parts of a common refrigerant circuit. '2. The process of claim 1 for steam extraction of air, characterized characterized in that the undersaturated air flowing out of the refrigerant condenser (2) j never has an additional amount ij mist-containing air is mixed to defog it. 109845/1536 -9- LINDEAkTIENGESILLSCHAFT ■ * 3, method according to claim 1 for cold air drying, characterized marked * that an amount of heat corresponding approximately to the work output of the refrigerant compressor (3) the closed refrigerant circuit before the refrigerant enters the refrigerant condenser (2) will. y 4. The method according to one or more of claims 1 to 3 » i: characterized in that two refrigerant evaporators (2) ^! are alternately traversed by the gas. 5 · Device for carrying out the method according to a or more of claims 1, 2 or 4, characterized !; shows that the refrigerant evaporator (1), the Kaite- ! ^! medium condenser (2) and a fan (5) for movement i ^{1 of} the gas are arranged in a tube (7). ' ; ^: 6, device according to claim 5, characterized in that ~ 2 j in the closed refrigerant circuit between refrigeration ; medium compressor (}) and refrigerant condenser (2) ^i:. in front of the inlet of the refrigerant condenser (2) yy. ■ '. ·! Heat exchanger (6) is arranged. jl 7 · Device according to claim 5 or 6, characterized in that that the refrigerant evaporator (1) is designed as a corrugated sheet heat exchanger. 109845/1536 LINDE AKTIENGESELLSCHAFT Patent application P 20 18 585.7- ^ 3 ' H 70/29 Claims 1. Process for defogging and / or drying gas, preferably Air, in which the gas initially falls below the saturation point of water in this gas with the separation of water is cooled and then heated again, characterized in that the gas is passed through a refrigerant evaporator (1) and then through a refrigerant condenser (2), which are both parts of a common refrigerant circuit, passed through and when heated is overflowed into an undersaturated state, whereby The gas is heated above its temperature at the inlet of the refrigerant evaporator (1). 2. The method according to claim 1 for defogging air, characterized characterized in that the undersaturated air flowing out of the refrigerant condenser (2) with an additional amount mist-containing air is mixed. . Method according to claim 1 for circulating air drying, in particular for cold air drying, characterized in that an approximate amount of the work performed by the refrigerant compressor O) 109845/1536 LINDE AKTIENGESELLSCHAFT A significant amount of heat from the closed refrigerant "circuit" is dissipated before the refrigerant enters the refrigerant condenser (2). 4. The method according to one or more of claims 1 to 3, characterized in that the gas then »when the refrigerant evaporator (2) by the separated moisture is frozen, is passed through a second refrigerant evaporator, while the refrigerant evaporator (2) is freed from the accumulated ice and vice versa, that the Gas then when the second refrigerant evaporator through the separated moisture is frozen, is passed through the refrigerant evaporator (2), during the second refrigerant evaporator freed from the accumulated ice will. 109845/1536 tar ropes