Water vapor generation method and device with control of flow quantity

Abstract

The invention discloses a water vapor generation method and device with control of flow quantity; water vapor is generated by carrying out a reaction of hydrogen with metal oxide particles under a condition of high temperature, wherein the oxidizability of metal cations in the metal oxide particles is stronger than that of hydrogen ions. Because the reaction rate of the hydrogen with the metal oxide particles under the condition of high temperature is quite fast and the reaction belongs to an irreversible reaction, the hydrogen can be completely oxidized, and high-pure water vapor with the concentration of close to 100% can be continuously produced; the flow quantity of the water vapor is completely controlled by the flow quantity of the hydrogen. Because the control precision of the flow quantity of the hydrogen is quite high, compared with a traditional generation method of generating water vapor from liquid water, the method has the control precision of the flow quantity of the water vapor greatly improved; in addition, the molar ratio of the reaction hydrogen to the generated water vapor is 1:1, the gas volume flow quantity is not changed in the reaction process, and the stability of the pressure of the water vapor can be ensured. Therefore, the method and the device have the advantages of stable water vapor output pressure and flow quantity, and high flow quantity control precision.

Description

technical field [0001] The invention belongs to the technical field of steam generation, and more specifically relates to a method and device for controlling flow of steam. Background technique [0002] Water vapor is a common raw material gas in chemical reaction process. To carry out experiments on the reaction of water vapor in the laboratory (such as coal char and steam gasification reaction, ethanol and steam reforming reaction, methane and steam reforming reaction, etc.), it is often necessary to achieve the stability of continuous trace water vapor supply to ensure the precision and accuracy of the experimental results. At present, the traditional water vapor generation method uses water as raw material, which is continuously injected into the heater through a peristaltic pump (or other constant flow water pump such as a syringe pump), and uses the principle of water absorption and evaporation to generate a small amount of water vapor. [0003] But the main problems...

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Problems solved by technology

[0004] Aiming at the above defects or improvement needs of the prior art, the object of the present invention is to provide a water vapor generation method with flow control, wherein through the process steps, especially the oxidation-reduction reaction mechanism of water vapor and its key process parameters, etc. Research and design, compared with the existing technology, can effectively solve the problems of low water vapor flow control accuracy and unstable water vapor generation in the existing water vapor generation method, and can meet the requirements for high-precision continuous trace water vapor generation (such as experimental room-level applications, etc.), and the steam generation method can conveniently supply raw materials, and can achieve the technical effect of continuous steam generation. The output pressure and flow of steam generated are stable, high-precision, and the precision can reach 4.464×10 -6 mol / min (at 1.013×10 5 Pa, about 0.137mL / min at 100°C), and it is simple to implement and easy to operate

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