System for decomposing ammonia to prepare hydrogen on the basis of after heat of heat engine gas exhaust

Abstract

The invention discloses a system for decomposing ammonia to prepare hydrogen on the basis of after heat of heat engine gas exhaust, which comprises a liquid ammonia bottle, an electronic control valve, a vaporization chamber, a heat exchanger, a cooler, a high-pressure air pump and a high-pressure hydrogen storage pump. The system is characterized by also comprising a heating cracker. The system utilizes hot gas exhausted by a heat engine such as an internal-combustion engine after doing work as a heat source for decomposing the ammonia to prepare the hydrogen, and the hot gas can meet the hydrogen consumption of the heat engine. The system adopts low-power electric heating when the internal-combustion engine is started or operated at a low speed with insufficient exhaust gas after heat, wherein generated hydrogen is used as energy to participate in combustion, and the hydrogen has about three times the high heat value of the petrol. Water is generated after the combustion, and nitrogen is directly exhausted into the atmosphere. The system adopts a catalysis and exhaust device for eliminating trace nitrogen oxides, thereby having zero pollution to environment. Moreover, through heat exchange, the exhaust temperature is low so as to reduce the heating effect of the combustion of the internal-combustion engine on the atmosphere environment.

Description

technical field [0001] The invention belongs to the field of automobile energy and power, and relates to an internal combustion engine exhaust waste heat recycling system, in particular to an ammonia decomposition hydrogen production system based on heat engine exhaust waste heat. Background technique [0002] Energy and the environment are the basis for human survival and development. However, the world today is facing many problems such as energy shortage, environmental pollution and greenhouse effect. Human beings must complete the development of alternative energy and related technologies before the depletion of fossil energy and the collapse of the living environment , in order to solve these problems, the development of clean and renewable new energy is imminent, which has attracted widespread attention from the international community. [0003] Hydrogen is recognized as a clean energy source, it has a wide range of sources and is rich in resources. Using hydrogen as a...

AI Technical Summary

Problems solved by technology

Therefore, the large amount of cheap production of hydrogen has been basically solved. Now the bottleneck restricting the application technology of hydrogen energy is the storage and transportation of hydrogen. At present, a variety of hydrogen storage and transportation technologies have been developed, which are either expensive, complicated to operate, or inefficient.

For example, the high-pressure compression method is a relatively cheap method, but a high-pressure hydrogen storage cylinder with a maximum capacity of 20MP can only store 1.6% of its weight hydrogen, and consumes a lot of compression work, and the volume is also very large

The cryogenic liquefaction method is to store the liquid hydrogen in a heat-insulating and pressure-resistant material container when the hydrogen is cooled to below -253°C. It is very expensive and complicated, and it needs to consume about 30% of the stored hydrogen energy, and it is very dangerous. In reality, only Space rockets use this technology regardless of cost

There are other technologies such as hydrogen storage of alloy materials. Those that can reach the practical stage are either high cost of materials or complicated operation. In addition, there are problems of hydrogen refueling and transportation, which are also very expensive and dangerous, and cannot be as popular as gas stations.

[0007] At present, it seems that the physical storage and transportation method of hydrogen has reached a dead end, but people undoubtedly ignore the chemical storage method of hydrogen. Usually, the common compounds of hydrogen: water, methane, ammonia, etc. are the raw materials for industrial hydrogen production. However, people have neglected to conduct in-depth research on these compounds as raw materials for hydrogen storage. Among them, ammonia gas has the most advantages: 1. It has a wide range of sources and is cheap. Nitrogen comes from air, and hydrogen comes from water. Ammonia commodity prices are low, domestic about 2700 yuan per ton, international about 400 dollars per ton, gasoline price is now about 7000 yuan at the wholesale price of No. 93 ton, liquid ammonia is lower than half of gasoline price

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