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Synthesis of ammonia with internal cooling circuit

An ammonia synthesis and circulating cooling technology, which is applied in ammonia compound, refrigeration and liquefaction, solidification and other directions, can solve the problems of limited cooling capacity of the internal cooling circuit, insufficient to meet the refrigeration needs of ammonia synthesis, and achieve the effect of improving cooling performance

Pending Publication Date: 2019-07-16
LINDE AG
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the cooling capacity of the internal cooling circuit is limited by the amount of ammonia that can be evaporated, which depends on the pressure, temperature and also the limited amount of fresh gas, so that in some cases the amount of ammonia is not sufficient for the refrigeration of the ammonia synthesis need

Method used

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  • Synthesis of ammonia with internal cooling circuit
  • Synthesis of ammonia with internal cooling circuit

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Embodiment Construction

[0022] The fresh gas 1, which is present at a pressure between 20 and 30 bar(a) and mainly consists of hydrogen and nitrogen, is precooled in the precooler E1 by means of a coolant stream 2 composed of precooled fresh gas The first part 3 of 1 and liquid ammonia 4 are formed. In order to be able to fully utilize the cooling potential of the precooled fresh gas fraction 3, the amount of liquid ammonia 4 is determined in such a way that liquid ammonia is also present in the heated coolant stream 29 in the precooler E1, which is then separated off at low pressure. In device D1, the gas phase saturated with ammonia is separated.

[0023] In order to further reduce the temperature, the second part 5 of the precooled fresh gas 1 is also mixed with liquid ammonia 6 which, due to the pressure, temperature and quantity of the fresh gas 5, initially evaporates only a small part. In order to reduce the partial pressure of ammonia and to be able to evaporate larger quantities of ammonia,...

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Abstract

The invention relates to a method for the synthesis of ammonia, in which a fresh gas (5) consisting largely of hydrogen and nitrogen is compressed via a compressor (C) (fresh-gas compressor) and subsequently fed to an ammonia converter (K) for conversion into a converter product (26) containing ammonia and comprising hydrogen and nitrogen, wherein, upstream of the fresh-gas compressor (C), ammonia(6) is evaporated into the fresh gas (5) in order to cool the fresh gas and to produce a cold substance mixture (9) comprising ammonia and the fresh gas, said substance mixture being heated in a heatexchanger (circuit cooler) (E2) against at least one process stream (10) to be cooled of the ammonia synthesis process, and subsequently compressed via the fresh-gas compressor (C), in order to obtain a compressed substance mixture (18) comprising ammonia and the fresh gas. A characterizing feature here is that, upstream of the circuit cooler (E2), a gas mixture (8) consisting largely of hydrogenand nitrogen is fed to a substance stream (7) comprising the fresh gas, the constituents of which gas mixture are separated from the converter product (26) and / or from the compressed substance mixture (18) comprising ammonia and the fresh gas.

Description

technical field [0001] The invention relates to a process for the synthesis of ammonia, in which fresh gas consisting essentially of hydrogen and nitrogen is compressed by a compressor (fresh gas compressor) and fed to an ammonia converter for conversion into ammonia-containing gas comprising hydrogen and Nitrogen converter product where ammonia upstream of the fresh gas compressor is evaporated into the fresh gas to cool the fresh gas and produce cold ammonia and a mixture including the fresh gas in a heat exchanger (recirculation cooler) Heated by at least one ammonia synthesis process stream to be cooled and then compressed by a fresh gas compressor to obtain a compressed mixed feed comprising ammonia and fresh gas. Background technique [0002] According to the prior art, ammonia is produced on an industrial scale from carbon-containing energy carriers such as natural gas, oil, coal or biomass, which are converted in this case into raw synthesis gas in a first process st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F25J3/06
CPCF25J3/0685C01C1/047C01C1/0447F25J3/0276
Inventor A·海因策尔T·哈塞尔施泰纳F·埃特内
Owner LINDE AG
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