JPS58122378A - Drain disposal device - Google Patents

Abstract

PURPOSE:To prevent the malfunction of a drain disposal device, by exchanging heat between drain produced from a cooler and discharge gas from a compressor, and as well by providing a drain evaporator for heating and evaporating the drain. CONSTITUTION:High temperature gas discharged from a compressor 1 is cooled down through a gas passage in a after cooler 3. Drain is separated from this compressed gas through a drain separator 4, is introduced from a drain outlet port 4B into a drain evaporator 5, and is heated and evaporated by compressed gas discharged from the compressor 1 while it flows through the passage 6 of the drain evaporator 5, thereby the drain is converted into vapor which is discharged to the atmosphere through an orifice 7. Accordingly, the malfunction of a drain disposal device may be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a drain treatment device in a compression device equipped with a cooler.

In an apparatus equipped with a compressor that pressurizes gas and a cooler that cools the pressurized gas, when the gas is cooled by the cooler, moisture in the gas condenses to generate drain.

Conventionally, a float type drain trap has been provided as a device for treating this drain.

In a drain trap, when a certain amount of condensate accumulates in the trap, a float floats and opens the valve body connected to the float to discharge the condensate inside the trap to the outside. Close the valve body to stop drainage.

In such a drain wrap, since it is in constant contact with the drain, rust occurs, and the rust causes the valve body to become clogged, resulting in a serious accident in which the drain cannot be discharged.

Further, a drain separator is generally provided between the drain wrap and the cooler 2, and rust occurs on the drain separator as well, so this rust causes earlier malfunction of the drain trap.

An object of the present invention is to provide a drain processing device that can maintain a good drain discharge operation.

High pressure ratio screw compressors, especially oil-free screw compressors, generate considerable heat of compression. Therefore,
The compressed gas discharged from the compressor has a high temperature of 200 to 350C. This invention is characterized in that the condensate is heated and vaporized by the heat of the high-temperature compressed gas, and the condensate is released in a vapor state.

2 In this way, when condensate is released in a vapor state,
The generation of rust is suppressed, and as a result, there is no need to drain the drain.

An embodiment of the present invention will be explained below with reference to the drawings.

An aftercooler 3 is connected to the discharge side of the oil-free screw compressor 1 via a discharge gas pipe 2. The aftercooler 3 includes three channels through which compressed gas passes and a channel 3B through which a cooling liquid flows, and cools the compressed gas with the cooling liquid.

A drain separator 4 is connected to the compressed gas passage outlet of the aftercooler 23 . The drain separator 4 has four outlets for compressed gas and a drain outlet 4B, and drains contained in the compressed gas (moisture in the gas is condensed as a result of being cooled by the aftercooler 23). Separate from compressed gas.

A drain evaporator 5 is connected to the drain outlet 4B of the drain separator 4. This drain evaporator 5 is installed at the discharge part of the oil-free screw compressor 1, and the outer wall 5
Person is in direct contact with compressed gas. The drain evaporator 5 may be installed in the middle of the discharge gas pipe 2 away from the main body of the oil-free screw compressor 1. Drain evaporator 5
has a passage 6 inside, the lower end of the passage 6 is connected to the drain outlet 4B, and the upper end 6B is provided with an orifice 7. The orifice 7 maintains the pressure inside the passage 6 of the drain flow rate 5 at a level slightly lower than the pressure inside the drain separator during drain processing, thereby balancing the drain flow rate to the drain evaporator.

Note that a valve may be provided between the drain separator 4 and the drain evaporator 5 to adjust the amount of drain passing through.

Next, the operation of this embodiment will be explained.

The high temperature compressed gas discharged from the oil-free screw compressor 1 passes through the discharge gas pipe 2 to the aftercooler 23.
The gas passes through the gas flow path. While passing through the gas flow path, the compressed gas is cooled to an appropriate temperature by a cooling liquid passing through a cooling liquid passage.

The cooled compressed gas enters the drain separator 4, where the drain condensed when cooled by the aftercooler 3 is separated and sent to the point of use from the compressed gas outlet 4A.

On the other hand, the drain separated by the drain separator 4 enters the drain evaporator 5 from the drain outlet 4B, and is heated by the compressed gas discharged from the screw compressor 1 while flowing through the passage 6 of the drain evaporator 5. It is vaporized and released into the atmosphere from the orifice 7 in the form of steam.

Next, the effects of this embodiment will be explained.

(1) According to this embodiment, there is no need for a valve mechanism for discharging condensate according to the accumulated amount of condensate, so malfunctions due to rust can be prevented and condensate can be discharged reliably. .

This makes it possible to eliminate hedren from being mixed into the compressed gas sent to the point of use.

(2) Since the heat of the compressed gas is used to heat the drain, the temperature from the compressed gas side becomes K when it is cooled by the latent heat of vaporization of the drain. Therefore, the temperature of the compressed gas flowing into the aftercooler can be lowered, and the heat exchange area (thickness) of the aftercooler can be reduced.

To explain an example, if air (atmospheric pressure) at a humidity of 80% and a temperature of 40 C is compressed to 71'4/crr1" G using an oil-free screw compressor with an intake air volume of 7 m", the drain The amount of heat exchanged in the evaporator is approximately 11
As a result, the heat exchange area of the aftercooler can be reduced by about 30%.

(3) Drain treatment becomes easier.

As described above, according to the present invention, it is possible to provide a drain treatment device that can maintain a smooth drain discharge operation.

BRIEF DESCRIPTION OF THE DRAWINGS The figure is a system diagram of an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1...Oil-free screw compressor, 2...Discharge gas pipe line, 3\...Aftercooler, 4...Drain sensor filter, 5...Drain evaporator, 6...Passway, 7
...orifice.

Claims (1)

[Claims] A compressor that has a cooler that cools the gas pressurized by the compressor exchanges heat between the condensate generated in the cooler and the gas discharged from the compressor, heating the condensate with the heat of the gas. A drain processing device characterized by being provided with a drain evaporator for vaporizing the drain.