Advanced heating system for ammonia synthesis catalyst and heating method

Abstract

The invention discloses an advanced heating system for an ammonia synthesis catalyst. The advanced heating system comprises an ammonia synthesis unit (2), wherein the ammonia synthesis unit (2) is connected with a pretreatment unit (1) and a non-shift gas washing tower (3) respectively; the pretreatment unit (1) comprises a CO conversion device (4); the CO conversion device (4) is connected with a molecular sieve (6) through a shift gas washing tower (5); the molecular sieve (6) is connected with a liquid nitrogen washing device (7); the ammonia synthesis unit (2) comprises an ammonia synthesis compressor (8); the ammonia synthesis compressor (8) is connected with an ammonia synthesis device (10) through a start-up heating furnace (9); the ammonia synthesis device (10) is provided with an ammonia synthesis catalyst bed (11). The advanced heating system greatly improves the production efficiency of synthesis ammonia, avoids the waste of process gas, reduces the production cost of synthesis ammonia, and effectively increases the utilization rate of the process gas.

Description

technical field [0001] The invention relates to a heating system and a heating method, in particular to an ammonia synthesis catalyst heating system and a heating method in advance. Background technique [0002] When the ammonia synthesis unit is started up, the ammonia synthesis catalyst requires the use of a start-up heating furnace to raise the bed temperature of the ammonia synthesis catalyst to above the catalyst activation temperature, and ammonia synthesis gas (nitrogen and H 2 The mixed gas) is used as a heat carrier to raise the temperature, and the heated fuel gas comes from ammonia synthesis gas. Before the temperature of the catalyst bed reaches the activation temperature, the ammonia synthesis gas is only a heat source carrier. Since the catalyst temperature does not reach the activation temperature, no ammonia synthesis reaction will occur. During the heating up of the ammonia synthesis catalyst, the ammonia synthesis gas at the gas refining outlet can only be...

AI Technical Summary

Problems solved by technology

At present, the heating method of ammonia synthesis catalyst bed mainly has the following disadvantages: 1) The start-up process period of ammonia synthesis is long, and the synthesis efficiency of ammonia synthesis is low; A large amount of process gas is vented and burned, which causes waste of process gas and increases the production cost of synthetic ammonia; 3) The fuel gas for starting the heating furnace comes from the process gas prepared in the gas refining section, and the generation of this part of the process gas requires a series of process operations , which delays the ignition time of the starting heating furnace, thereby prolonging the time from ammonia synthesis start-up to product production, increasing production costs, and reducing the utilization rate of process gas

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