Hydrogen production by methanol cracking
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Help! I’m a newcomer and want to build a hydrogen station; I’m considering using methanol cracking to produce hydrogen (I’m not sure if this is cost-effective). The production capacity should be 30 M3/h, with the produced hydrogen being stored in 40L steel cylinders. May I ask what equipment is required, what are the prices of each piece of equipment, what are the production and maintenance costs, and what is the production cost per cubic meter of hydrogen? Thank you! ! ! My email address is: f93231@126.com
Methanol cracking for hydrogen production consists of two parts: methanol steam reforming and pressure swing adsorption for hydrogen production. Methanol and deionized water are mixed, heated to vaporize, and then superheated before entering the conversion furnace. There, under the action of a catalyst, methanol and water vapor undergo two chemical reactions: methanol cracking and carbon monoxide conversion to carbon dioxide. The reaction products are separated through heat exchange, cooling, condensation, and washing, resulting in a conversion gas that contains 73% hydrogen and 25% carbon dioxide. The one-way conversion efficiency of methanol is over 90%, with the unreacted portion being recycled. The conversion gas then enters a pressure swing adsorption process, which involves adsorption, desorption at gradually decreasing pressures, gradual pressure increase, and again adsorption, in a repeating cycle. The more adsorption towers there are, the higher the hydrogen recovery rate. This system also requires a heat transfer oil heating system, and different heating methods can be employed depending on the manufacturer. This system is an automatic control system that can be operated from the control room. Raw materials used by the system, as well as energy and consumption figures: (based on 1000 cubic meters of hydrogen) methanol (0.56 t), deionized water (0.32 t), diesel (for heating the heat transfer oil) (0.125 t), circulating water (40 t), instrument air (100 cubic meters), electricity (90 kwh), steam (0.02 t), specialized catalyst (0.2 kg), nitrogen for startup, hydrogen for startup. The main equipment includes: vaporization tower, superheater, converter, heat exchanger, cooler, water washing tower, circulating liquid storage tank, methanol intermediate tank, deionized water intermediate tank, conversion gas buffer tank, filter, adsorber, hydrogen buffer tank, blower, vacuum pump, feed pump, buffer air bag, and heat transfer oil heater.
Hydrogen of different concentrations can be produced by using various concentrations of water and methanol; the Shanxi Institute of Coal Chemistry, Chinese Academy of Sciences, possesses a facility for producing hydrogen through methanol cracking.
Thank you all. As our methanol production capacity has reached 1 million tons, we are considering installing an additional methanol cracking unit for hydrogen production and reduction. Operating costs are not a major concern; what’s important is whether the unit is easy to control, whether it’s simple to operate, as well as the investment required and the construction time. Please share your valuable advice
The method of producing hydrogen through methanol cracking may not be very effective these days. Firstly, the price of methanol has been rising steadily over the past two years, which directly increases the cost of hydrogen. In fact, the utilization of hydrogen as a by-product means that its price is much lower than that of hydrogen produced from methanol
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