tormorten

Gives you the option to disable comments for individual post types.

Disable Comments for Post Types

Adds the option to disable comments for specific post types.

themifyme

Themify Portfolio Posts is a simple plugin that allows you to showcase your projects info in a clean layout. Minimal and sleek, you can click on each image of your gallery portfolio and opt to show further details such as the project type, client name, and commission date – or edit each heading and name your own.
Themify Portfolio Post plugin is compatible with any theme and users can install it on their WordPress admin dashboard like all other plugins.

Themify Portfolio Post

Add a simple Portfolio post type to your site.

Disable Comments for Post Types vs Themify Portfolio Post