System for recovering variable gas heat energy in hydrogen production device

Abstract

The invention relates to a system for recovering variable gas heat energy in a hydrogen production device. The system comprises a medium-temperature shift reactor, a medium-shift gas first water distribution tank, a medium-shift gas second water distribution tank and a medium-shift gas third water distribution tank which are sequentially connected through pipelines, a second boiler feed water preheater and a first boiler feed water preheater are sequentially arranged on a pipeline between the medium-temperature shift reactor and the first medium-shift gas water distribution tank; a desalted water preheater is arranged on the pipeline between the medium-change gas first water distribution tank and the medium-change gas second water distribution tank; a medium-change gas air cooler is arranged on the pipeline between the medium-change gas second water distribution tank and the medium-change gas third water distribution tank; the system is further provided with a fourth medium-shift gas water distribution tank, a medium-shift gas water cooler is arranged on the pipeline between the third medium-shift gas water distribution tank and the fourth medium-shift gas water distribution tank,and the output end of the fourth medium-shift gas water distribution tank is connected to a PSA hydrogen purification system. The system has the beneficial effects that the heat energy of the medium-temperature shift gas is fully recycled, and the energy consumption and the cost of the hydrogen production device are reduced.

Description

technical field [0001] The invention relates to a system for recovering heat from medium-transition gas, in particular to a system for recovering heat energy from medium-transition gas in a hydrogen production device, and belongs to the technical field of petrochemical equipment. Background technique [0002] With the development of oil refining process, especially the wide application of hydrogenation process, it not only increases the demand for hydrogen, but also promotes the development of hydrogen production process. High-quality, stable and high-purity hydrogen has become an indispensable basic raw material for oil refineries in the new century to increase light oil yield and improve product quality. Various hydrogen production process routes include dry gas hydrogen production, electrolysis hydrogen production, water gas hydrogen production, methanol production Cracking hydrogen production, light oil hydrogen production, heavy oil hydrogen production, etc., the hydrog...

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Problems solved by technology

[0004] The present invention mainly aims at the problem that the low-temperature heat of shifted gas is not fully utilized in the existing hydrogen production system, and provides a system for recovering the heat energy of shifted gas in a hydrogen production device. , Boiler feed water second preheater, boiler feed water first preheater, steam generator and demineralized water preheater, recover most of the waste heat of the medium-transformation gas, and then pass through the medium-transformation gas air cooler and the medium-transformation gas-water cooler After cooling to 40°C, it enters the PSA hydrogen purification system, which can fully recover the heat energy of the medium-change gas and reduce the energy consumption and cost of the hydrogen production unit

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