MULTI-LAYER FILTER, GAS TURBINE INCLUDING A MULTI-LAYER FILTER, AND PROCESS OF FILTERING
A multi-layer filter, a gas turbine including a multi-layer filter, and a process of filtering are disclosed. The multi-layer filter includes a nano-fiber layer positioned to receive an airflow, a coalescing base medium layer, and a membrane layer. The coalescing base medium and the membrane layer are positioned for the airflow to travel through the nano-fiber layer and the coalescing base medium layer, then through the membrane layer. The gas turbine includes an inlet and the multi-layer filter in a filter portion. The process includes positioning the multi-layer filter and directing an airflow through the multi-layer filter
1 . A multi-layer filter, comprising:
a nano-fiber layer positioned to receive an airflow;
a coalescing base medium layer; and
a membrane layer;
wherein the coalescing base medium layer and the membrane layer are positioned for the airflow to travel through the nano-fiber layer and the coalescing base medium layer, then through the hydrophobic membrane layer.
2 . The filter of claim 1 , wherein the nano-fiber layer is arranged and disposed to promote surface loading.
3 . The filter of claim 1 , wherein the nano-fiber layer is arranged and disposed to permit moisture to pass through the nano-fiber layer.
4 . The filter of claim 1 , wherein the nano-fiber layer is bonded to the coalescing base medium layer.
5 . The filter of claim 1 , wherein the coalescing base medium layer is configured for depth loading and burst strength.
6 . The filter of claim 1 , wherein the coalescing base medium layer coalesces water and hydrocarbons.
7 . The filter of claim 1 , wherein the hydrophobic membrane layer includes polytetrafluoroethylene, expanded polytetrafluoroethylene, or polyethylene.
8 . The filter of claim 1 , wherein the membrane layer is hydrophobic.
9 . The filter of claim 1 , wherein the membrane layer provides filtration efficiency of at least 85% at the most penetrating particle size, an integral value of about 0.05% penetration, a local value of about 99.75% filtration efficiency, and a local value of about 0.25% penetration.
10 . The filter of claim 1 , further comprising a scrim layer, wherein the scrim layer is positioned for the airflow to travel through the scrim layer then the nano-fiber layer.
11 . The filter of claim 1 , further comprising a scrim layer, wherein the scrim layer is positioned for the airflow to travel through the membrane layer then the scrim layer.
12 . The filter of claim 1 , further comprising a first scrim layer and a second scrim layer, the first scrim layer being positioned proximal to the nano-fiber layer and the second scrim layer being positioned proximal to the membrane layer.
13 . The filter of claim 1 , wherein the airflow is within a gas turbine inlet system.
14 . A gas turbine inlet system, comprising:
a turbine section, comprising:
a compressor positioned to receive an airflow from an inlet portion;
a combustion system configured to receive the airflow from the compressor and to combust a fuel; and
a turbomachine configured to be powered by the combustion of the fuel by the combustion system;
an inlet portion positioned to provide the airflow to the compressor, the inlet portion comprising:
an air inlet;
a filter portion, the filter portion having a multi-layer filter, the multi-layer filter comprising;
a nano-fiber layer positioned to receive the airflow;
a coalescing base medium layer; and
a membrane layer;
wherein the coalescing base medium layer and the hydrophobic membrane layer are positioned for the airflow to travel through the nano-fiber layer and the coalescing base medium layer, then through the membrane layer to downstream components of the gas turbine.
15 . The turbine inlet system of claim 14 , wherein the membrane layer is hydrophobic.
16 . The turbine inlet system of claim 14 , wherein the membrane layer is oleophobic.
17 . The turbine inlet system of claim 14 , wherein the coalescing base medium layer coalesces one or more of moisture and hydrocarbons.
18 . The turbine inlet system of claim 14 , wherein the coalescing base medium layer is configured for depth loading and burst strength.
19 . The turbine inlet system of claim 14 , wherein the hydrophobic membrane layer includes polytetrafluoroethylene, expanded polytetrafluoroethylene, or polyethylene.
20 . A process of filtering an airflow, the process comprising:
positioning a multi-layer filter, the multi-layer filter comprising:
a nano-fiber layer positioned to receive an airflow;
a coalescing base medium layer; and
a membrane layer;
directing the airflow through the nano-fiber layer, through the coalescing base medium layer, then through the membrane layer;
permitting moisture to pass through the nano-fiber layer; and
coalescing one or more of the moisture and hydrocarbons with the coalescing base medium layer.