Flue gas low-temperature adsorption denitration system and process

A flue gas adsorption denitration system, comprising a booster fan (1), a cold energy recoverer (2), a flue gas cooling system (3), a flue gas switching valve (4), a first denitration adsorption tower (5), and a second denitration adsorption tower (6),

• wherein the flue gas cooling system (3) cools flue gas to a temperature below 25° C., an inlet of the booster fan (1) is in communication with an inlet flue gas pipeline, an outlet of the booster fan (1) is in communication with a hot-side inlet of the cold energy recoverer (2), a hot-side outlet of the cold energy recoverer (2) is in communication with an inlet of the flue gas cooling system (3), a flue gas outlet of the flue gas cooling system (3) is in communication with an inlet of the flue gas switching valve (4), an outlet of the flue gas switching valve (4) is respectively in communication with a flue gas inlet of the first denitration adsorption tower (5) and a flue gas inlet of the second denitration adsorption tower (6), a flue gas manifold (7) is provided on a flue gas pipeline leading to the cold energy recoverer (2), a flue gas outlet of the first denitration adsorption tower (5) and a flue gas outlet of the second denitration adsorption tower (6) are in communication with an inlet of the flue gas manifold (7), and an outlet of the flue gas manifold (7) is in communication with a cold-side inlet of the cold energy recoverer (2),
• wherein the flue gas cooling system (3) comprises a primary cooling system and a secondary cooling system;
• the primary cooling system is an air cooling system, a heat exchanger cooling system, or a water cooling system;
• the secondary cooling system is a compression refrigeration system or an absorption refrigeration system;
• and the flue gas cooling system (3) is provided with a flue gas condensate water outlet, and the flue gas condensate water outlet is in communication with a water inlet of a water treatment system.