Three-way valve external circulation heating regenerative gas dryer

Abstract

The invention relates to a gas drying device, and particularly discloses an external circulation heating regeneration gas dryer with three-way valves. The dryer comprises a first adsorption / regeneration tower, a second adsorption / regeneration tower, a pre-filter and a post-filter, wherein inlets of the first adsorption / regeneration tower and the second adsorption / regeneration tower are communicated with two ports of the three-way valve A by inlet pipes; a third port of the three-way valve A is communicated with an outlet of the pre-filter by a pipeline; outlets of the first adsorption / regeneration tower and the second adsorption / regeneration tower are communicated with two ports of the three-way valve B by outlet pipes; a third port of the three-way valve B is communicated with an inlet of the post-filter by a pipeline; the three-way valve C is connected with the three-way valve B in parallel between the two outlet pipes; the post-filter is connected with a third port of the three-way valve C via a circulation fan and a heater in sequence; and the three-way valve D is connected with the three-way valve A in parallel between the two inlet pipes, and connected with the pre-filter via a cooler and a separator in sequence. According to the gas dryer, the continuous dehydration stability of the two towers is ensured.

Description

technical field [0001] The invention relates to a gas drying device, in particular to a three-way valve external circulation heating regeneration gas dryer. Background technique [0002] In various fields of compressed gas production and application, it is usually necessary to adopt different degrees of dehydration and purification measures for compressed gas to meet different application requirements. The existing adsorption dehydration drying device is used for dehydration and purification of compressed gas. [0003] The current heating and regenerative adsorption gas drying devices are equipped with two adsorption towers, and each adsorption tower is filled with adsorbents, such as molecular sieves, silica gel, etc. During operation, one of the adsorption towers is used to absorb and dehydrate the compressed gas, and the other One adsorption tower will desorb and regenerate the adsorbent, and the two adsorption towers will switch alternately to achieve continuous dehydrat...

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Problems solved by technology

The device simplifies the switching pipelines of the two adsorption towers, and is easy to operate and control. The desorption of the adsorbent adopts the regeneration gas closed cycle heating and cooling method, and the regeneration gas is no longer vented, and the isobaric regeneration is realized. However, due to the three The regenerated gas is only separated and filtered through valve closed cycle heating, and contains a lot of water. After the regenerative adsorption tower is heated and regenerated, it needs to cool down the adsorption tower. At this time, the heater stops working, and the circulating compressor is always During non-stop operation, the regeneration gas is still circulating, so that part of the adsorbent at the inlet of the regeneration gas in the regeneration adsorption tower will absorb the residual moisture in the regeneration gas and the cooler and separator, thereby losing part of the adsorption capacity. Due to the need for dehydration and purification The flow direction of the compressed gas is opposite to the flow direction of the regeneration gas, which causes it to be polluted by this part of the adsorbent when it flows out of the adsorption tower after it is put into use again, so that the dew point temperature of the compressed gas at the outlet rises instead, and it takes 1 to 2 hours. , the performance index can return to the normal level, if the drying continues during this period, the drying result usually does not meet the specified requirements

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