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Device and method for preparing methanol from synthesis gas by coupling with Kalina cycle

A Karina cycle and synthesis gas technology, applied in chemical instruments and methods, preparation of organic compounds, refrigeration and liquefaction, etc., can solve the problems of not considering the generation and utilization of heat, low energy utilization rate, and less waste heat, etc. , to achieve the effect of improving waste heat recovery and energy utilization efficiency

Inactive Publication Date: 2020-12-01
DALIAN UNIV OF TECH
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Problems solved by technology

[0006] At present, when the waste heat recovery from syngas to methanol is carried out in the literature, the low-grade waste heat is mainly recovered through the thermal cycle, and the generation and utilization of heat in the process are not considered. few

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  • Device and method for preparing methanol from synthesis gas by coupling with Kalina cycle

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Embodiment

[0026] The flow rate of the synthesis gas inlet stream is 11450 kmol / h, the temperature is 50°C, and the pressure is 51.2 bar. The feed contains 67.45% hydrogen, 22.97% carbon monoxide, 6.86% carbon dioxide, 0.23% water, and 2.48% nitrogen. The temperature of the second separator SE2 was 38°C. The reaction pressure, medium temperature and reactor inlet temperature of syngas to methanol are 74.6bar, 173.2°C and 123.7°C, respectively. The evaporation temperature, evaporation pressure, ammonia mass fraction and working fluid flow rate of the Karina cycle are 144.3℃, 68.5bar, 0.894 and 110.0kg / s, respectively.

[0027] By adopting the device and method of the present invention, the energy of producing methanol from synthesis gas can be utilized and recovered to the greatest extent. The net power production of the entire coupling design unit is 15206.3kW, which includes the power consumption of syngas to methanol and the power production of the Karina cycle.

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Abstract

The invention belongs to the field of waste heat recovery in the chemical industry, and relates to a device and method for preparing methanol from synthetic gas by coupling with Kalina cycle. On the premise of not reducing the total conversion rate of the methanol prepared from the synthesis gas, the waste heat in the methanol prepared from the synthesis gas is recycled by adopting the Kalina cycle, so that the waste heat recycling amount and the energy utilization efficiency of the coupled Kalina cycle system for preparing the methanol from the synthesis gas are improved to the greatest extent.

Description

technical field [0001] The invention belongs to the field of waste heat recovery in the chemical industry, and relates to a device and method for producing methanol from synthesis gas coupled with a Karina cycle. Background technique [0002] Methanol is one of the main organic chemical raw materials, which can be used as an excellent organic solvent and a necessary raw material for the production of various organic chemical products. Furthermore, methanol is one of the most traded (top five) industrial compounds in the world and an alternative to fossil fuels. With the development of science and technology, the application of methanol is more and more extensive, and the market demand for methanol has a bright prospect. Syngas to methanol process is an energy-intensive chemical production process, effective use of waste heat can improve energy utilization and economic benefits. [0003] The literature (A novel pinch-based method for process integration and optimization of ...

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Application Information

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IPC IPC(8): C07C29/152C07C31/04F25B30/02
CPCC07C29/152F25B30/02C07C31/04Y02P20/10Y02P20/50
Inventor 庄钰都健周聪聪董亚超
Owner DALIAN UNIV OF TECH