The following snippet shows the WMS layer custom projection in LEAFLET for Albers equal area and UTM zone 13.
Step 1.
First of all include -
leaflet.js
proj4.js
proj4leaflet.js in following order.
<link rel="stylesheet" href="http://cdn.leafletjs.com/leaflet-0.7/leaflet.css" />
<script src="http://cdn.leafletjs.com/leaflet-0.7/leaflet-src.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/proj4js/2.0.0/proj4.js"></script>
<script src="http://mapserv.utah.gov/cdn/examples/proj4leaflet.js"></script>
Step 2: Create new Proj4Leaflet CRS
Find your desired custom projection type in http://spatialreference.org/ and punch the the projection variable in the following code snippet.