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Method for promoting bunsen reaction in thermochemical sulfur-iodide cycle hydrogen production

A thermochemical and reaction technology, applied in the direction of hydrogen production, etc., can solve the problems of low HI concentration in HIx phase and slow reaction kinetic rate, and achieve the effect of improving kinetic rate and omitting the HI concentration step.

Active Publication Date: 2015-09-09
ZHEJIANG UNIV
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Problems solved by technology

[0009] The technical problem to be solved in the present invention is to overcome the shortcomings of the traditional gas-liquid-solid three-phase Bunsen reaction kinetic rate and the low HI concentration in the HIx phase, and provide a method for promoting the Bunsen reaction in the thermochemical sulfur-iodine cycle hydrogen production

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  • Method for promoting bunsen reaction in thermochemical sulfur-iodide cycle hydrogen production

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specific Embodiment 1

[0022] 0.78mol I 2 and 4.2mol H 2 O was added to the reactor, and the reaction solution was heated to a set temperature of 30°C while stirring the reaction solution at a constant speed; SO 2 Pass the above reaction solution at a flow rate of 60NmL / min, at this time, the Bunsen reaction will proceed spontaneously to generate H 2 SO 4 and HI; in the presence of excess iodine, the resulting mixed solution undergoes liquid-liquid phase separation at a certain moment, forming a layered H 2 SO 4 phase (upper layer) and HIx phase (lower layer), the reaction reaches a liquid-liquid equilibrium state after a period of time.

specific Embodiment 2

[0023] 0.78mol I 2 , 0.117mol HI and 4.2mol H 2 O is added to the reactor, the reaction solution is heated to a set temperature of 30°C, and the reaction solution is stirred at a constant speed to ensure that I 2 Fully dissolved; SO 2 Pass the above reaction solution at a flow rate of 60NmL / min, at this time, the Bunsen reaction will proceed spontaneously to generate H 2 SO 4 and HI; in the presence of excess iodine, the resulting mixed solution undergoes liquid-liquid phase separation at a certain moment, forming a layered H 2 SO 4 phase (upper layer) and HIx phase (lower layer), the reaction reaches a liquid-liquid equilibrium state after a period of time.

specific Embodiment 3

[0024] 0.78mol I 2 , 0.233mol HI and 4.2mol H 2 O is added to the reactor, the reaction solution is heated to a set temperature of 30°C, and the reaction solution is stirred at a constant speed to ensure that I 2 Fully dissolved; SO 2 Pass the above reaction solution at a flow rate of 60NmL / min, at this time, the Bunsen reaction will proceed spontaneously to generate H 2 SO 4 and HI; in the presence of excess iodine, the resulting mixed solution undergoes liquid-liquid phase separation at a certain moment, forming a layered H 2 SO 4 phase (upper layer) and HIx phase (lower layer), the reaction reaches a liquid-liquid equilibrium state after a period of time.

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Abstract

The invention relates to a technique of iodine cycles for hydrogen manufacturing, and aims to provide a method for promoting a Bunsen reaction in a thermochemical iodine-sulfur cycle for hydrogen manufacturing. The method comprises the following steps: adding I2 and H2O in a reactor, and heating a reaction solution to 30-72 DEG C; adding hydroiodic acid under the condition that the mass ratio of HI / H2O is 1 / 36-1 / 18: 1, and mixing the reaction solution at a uniform speed so as to ensure I2 is completely dissolved; feeding SO2 at a constant flow rate, and spontaneously carrying out the Bunsen reaction so as to obtain H2SO4 and HI; and in the presence of excessive iodine, carrying out the separation of liquid-liquid phases, so that the reaction achieves a liquid-liquid equilibrium state finally. According to the invention, the original gas-liquid-solid three-phase reaction is transferred into a gas-liquid reaction, and then the kinetic velocity of the Bunsen reaction is improved; and added HI has certain contribution to the improvement of the concentration of HI in a HIx phase in a thermodynamic equilibrium state, and HI achieves a super azeotropic concentration, so that the situation that pure HI steam is obtained through subsequent distillation is facilitated, and a HI concentration step can be cancelled, therefore, the method is extremely advantageous to the simplification of a whole SI circulation system and the improvement of the thermal efficiency of the system.

Description

technical field [0001] The invention relates to the iodine cycle hydrogen production technology, in particular to a new method for promoting the Bunsen reaction in the thermochemical sulfur iodine cycle hydrogen production. Background technique [0002] Hydrogen has a wide range of sources, can be stored, transported, renewable, high calorific value, combustion only produces water and no CO 2 , NOx and SOx emissions are considered to be an ideal energy carrier. The efficient, large-scale, low-cost and pollution-free production of hydrogen is the basis for the development of hydrogen economy. Hydrogen is a secondary energy that needs to be produced from primary energy. There are many ways to produce hydrogen, which can be mainly divided into hydrogen production from fossil energy, hydrogen production from biomass and hydrogen production from water according to raw materials. Among various hydrogen production methods, thermochemical sulfur-iodine circulating water splitting...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B3/04
CPCY02E60/364Y02E60/36
Inventor 张彦威周俊虎岑可法王智化刘建忠周志军杨卫娟程军黄镇宇
Owner ZHEJIANG UNIV
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