You can create function using wp_trim_excerpt to grab the first paragraph of text and ignore images
function custom_excerpt($text, $raw_excerpt) {
if( ! $raw_excerpt ) {
$content = apply_filters( 'the_content', get_the_content() );
$text = substr( $content, 0, strpos( $content, '</p>' ) + 4 );
}
// strip any images on the code
$text = preg_replace("/<img[^>]+\>/i", "", $text);
return $text;
add_filter( 'wp_trim_excerpt', 'custom_excerpt', 10, 2 );