Heat supply system and method for hydrogen production by methanol reforming

Abstract

The invention discloses a heat supply system for hydrogen production by methanol reforming. The system comprises: a water vapor generation device for heating liquid water and separating out saturatedsteam; a methanol feeding device, wherein the methanol feeding device comprises a methanol tank and a methanol feeding pipeline which are connected in sequence, and an outlet of the methanol feeding pipeline is connected with a methanol inlet in the water vapor generation device; an oxygen inlet device, wherein the oxygen inlet device comprises an oxygen tank and an oxygen inlet pipeline, and an outlet of the oxygen inlet pipeline is connected with an air inlet in the water vapor generation device; a water inlet device, wherein the water inlet device comprises a water tank and a water inlet pipe with a water pump, and the water inlet pipe is connected with a fresh water inlet in the water vapor generation device; and a reforming reactor connected with a water vapor outlet in the water vapor generation device and circularly connected to the water vapor generation device through an evaporator. The invention further provides a heat supply method for hydrogen production by methanol reforming. The heat supply system and the heat supply method are uniform and constant in heat supply, and the reforming hydrogen production reaction efficiency can be improved.

Description

technical field [0001] The invention belongs to the technical field of heat supply and transmission, and relates to a heat supply system and method for methanol reforming to produce hydrogen. Background technique [0002] With the increasingly severe fossil energy crisis and environmental pollution, the development of efficient, clean and renewable new energy has become an urgent need for people. Hydrogen has a high combustion calorific value per unit mass, and the only product produced is water, which has no pollution to the environment. It is an ideal high-efficiency and environmentally friendly new energy source, and is recognized as a future energy source. [0003] At present, the main sources of hydrogen are hydrogen production by reforming fossil fuels and hydrogen production by electrolysis of water. Among them, the electrolysis of water to produce hydrogen requires a large amount of electricity and is expensive. The cost of hydrogen production by reforming fossil f...

AI Technical Summary

Problems solved by technology

One is to directly use (catalyzed) combustion flue gas to provide heat for the methanol-water reforming reaction, which is mostly suitable for small-scale methanol reforming hydrogen production units. Its advantages are compact structure and high volume utilization, and its disadvantage is that the reforming reactor is easy to be heated Uneven temperature control is difficult, and it is difficult to apply to large-scale methanol reforming hydrogen production units

The other, more common method is to use heat transfer oil as an intermediate heat transfer carrier. The advantage is that the reforming reactor is heated more uniformly and the temperature is controlled more accurately. The disadvantages include: cracking and deterioration of the heat transfer oil may occur after long-term operation , affect the use, and have potential safety hazards; the heat transfer oil system consists of many equipment, generally including high-temperature heat oil pumps, expansion tanks, heat transfer oil furnaces, etc. in, causing pollution

However, its heating system still uses a high-temperature circulation pump to maintain a closed cycle of water vapor, which increases the installation and operation and maintenance costs of the system

Moreover, this patented solution cannot guarantee that the water vapor used for heating is in a saturated state, and its heating and temperature control effect needs to be further improved

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