Ammonia refrigeration system and anti-surge method

Abstract

The invention discloses an ammonia refrigeration system and an anti-surge method, and belongs to the technical field of ammonia synthesis. Comprising an ammonia compressor, an ammonia condenser, an ammonia receiving tank, an ammonia cooler and an ammonia separator, the ammonia separators comprise a first ammonia separator, a second ammonia separator and a third ammonia separator; the ammonia coolers comprise a low-temperature methanol washing ammonia cooler group, a synthesis primary ammonia cooler and a synthesis secondary ammonia cooler; an ammonia receiving tank is connected with inlets of a low-temperature methanol washing ammonia cooler set, a synthesis primary ammonia cooler and a synthesis secondary ammonia cooler, an outlet of the low-temperature methanol washing ammonia cooler set, a first separator and a primary inlet of an ammonia compressor are sequentially connected, and an outlet of the synthesis primary ammonia cooler, a second ammonia separator and a secondary inlet of the ammonia compressor are sequentially connected. An outlet of the synthesis second-stage ammonia cooler, a third ammonia separator and a third-stage inlet of the ammonia compressor are sequentially connected; a first-stage outlet of the ammonia compressor is divided into two paths of output, one path is connected with an inlet of the first ammonia separator through a first anti-surge line, and the other path is connected with a second-stage inlet of the ammonia compressor.

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