You Can do this by using is_system attribute for example:
$this->addColumn('column_name', array( 'header' => Mage::helper('warranty')->__('Batch Number'), 'align' => 'left', 'width' => '120px', 'index' => 'column_name', 'is_system' => true, ));
Now column with column_name will not be exported.
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