Quick start-up palladium membrane components transferring heat by small-scale passage

Abstract

The invention discloses a fast starting Pd alloy membrane component which transfers heats through small passage, comprising a membrane-supporting frame, a porous metal-supporting body and a Pd alloy membrane; two porous metal-supporting bodies and the Pd alloy membrane are respectively arranged at the two sides of the membrane supporting frame where a purified hydrogen passage and a small passage are arranged; the small passage is an airflow passage for heating passing through the interior of the membrane supporting frame, with the section of rectangle and the section dimension of 0.2-1.0mm multiplied by 0.2-1.0mm; a passage inlet and a passage outlet connected with the small passage are arranged on the membrane supporting frame; the hydrogen flow passage on the supporting body is in rectangle tooth shape; an air guide outlet is arranged on the upper end of the supporting frame. The component can quickly lead the temperature of the Pd alloy membrane component to rise to requirement working temperatures by using the flowing heat conduction of the heat fluid in the small passage, thus reducing the metal content of the Pd alloy membrane component and further reducing the temperature increment time.

Description

technical field [0001] The invention relates to a technology for purifying and producing high-purity hydrogen from synthesis gas, in particular to a quick-start palladium membrane module utilizing small-scale channels for heat transfer. Background technique [0002] At present, 90% of the hydrogen in the world comes from chemical processes such as reforming, gasification or cracking of hydrocarbons (natural gas, coal, biomass, etc.), and the purification of synthesis gas is one of the key processes. Available purification techniques include: pressure swing adsorption, polymer membrane separation, palladium (alloy) membrane separation, low temperature separation, etc. Compared with other separation technologies, the operating temperature of palladium alloy membrane separation is higher (450-600°C), which can be coupled with the synthesis gas production process, thereby breaking the reaction equilibrium conversion rate, increasing the hydrogen production rate, shortening the p...

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Problems solved by technology

However, due to the poor pressure resistance and vibration resistance of ceramics, and the thermal expansion coefficient of the palladium alloy film is quite different from that of ceramic materials, the palladium alloy film is easily damaged during actual use.

On the other hand, if ordinary stainless steel supports (without small-scale channels for heat transfer) are used, the time required for the palladium alloy membrane module to heat up from room temperature to working temperature is too long (more than 3 hours), which is not conducive to frequent Start-up application of small-scale distributed hydrogen production

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