SU944621A1 - Apparatus for purifying hydrogen - Google Patents

Description

This invention relates to the sorption purification of hydrogen from gaseous impurities.

A device for cleaning and compressing gas mixtures is known, which includes two pairs of adsorbers installed and a piping system for connecting them f1.

It is also known a device for hydrogen purification, comprising a housing, two layers of adsorbent separated by a septum, gas inlet and outlet connections t 2.

A disadvantage of the known devices is their low efficiency, due to the high heat consumption for the desorption process.

The aim of the invention is to increase the efficiency of the cleaning process by reducing the heat consumption for the desorption process.

This goal is achieved by the fact that in a hydrogen purification device, including a housing, two sorbent layers separated by a septum, gas inlet and outlet nozzles, the septum is closed, and the sorbent layers are placed on the outer and inner sides of the septum. ,

It is advisable that the partition was made zigzag.

The drawing schematically shows a device for hydrogen purification.

Claims (2)

The device is made in the form of alternately cooled and heated KciMep 1 and 2, filled with layers of solid sorbent, for example, an intermetallic compound LaNig-. Chambers have a common heat exchange surface. Chambers 1 and 2 are separated by a gas path by a gas-impermeable partition 3 and can be alternately connected via pipelines 4 and 5 to the outlets of a two-way valve 6, the inlet of which is connected to the source 7 of contaminated hydrogen. The outlet piping 8 and 9 of the chambers are connected to the inlets of a two-way valve 10, the outlet of which is connected to the collection 11 of purified hydrogen. The valve 10 can connect to the collection 11 of purified hydrogen either Pipeline 8 with the pipe 25 closed 9, or vice versa. In addition, the valve 10 can simultaneously close the piping 8 and 9, To the output piping 8 and 9 are connected valves 12 and 13, designed to discharge impurities. Chambers 1 and 2 have a heat-insulating screen 14. In one of the chambers there is a coil 15 for supplying heat transfer fluid. A device for hydrogen purification works as follows. Hydrogen containing gas impurities from source 7 enters the inlet of a two-way valve b, the outputs of which can be connected through pipelines 4 and 5 or to the inlet of chamber 1 or 2. It is known that the process of sorption is exothermic, and, consequently, hydrogen absorption by intermetallic hydrogen is released a certain amount of heat (for example, at absorption of 1 mol H, with LaNi intermetallic acid — 7 g 5 kcal). Accordingly, the desorption process is exothermic. Therefore, when absorbing hydrogen by the sorbent, it is necessary to divert significant amounts of heat from the hydride chambers, and to dissipate it when released. When the device is initially turned on to accelerate the process of absorbing contaminated hydrogen (the valve is turned on so that hydrogen flows from source 7 to chamber 2, valve 1 closes pipeline 9) chamber 2 is cooled by coolant (e.g. water) through the coil 15. Then, after absorption of hydrogen and impurities by the intermetallic compound of chamber 2, the supply of coolant to the coil 15 is stopped and the valve is switched so that the contaminated hydrogen from source 7 flows through conduit 4 to chamber 1, also filled with intermetallic. At this time, the valve 10 connects to the collection 11 of purified hydrogen pipe 9, and the output of the pipe 8 locks. In this position, the contaminated hydrogen is absorbed by the intermetallic in chamber 1, and at the same time it releases heat from the phase transition. This heat is transferred through the heat exchange wall 3 (playing the role of a gas-tight barrier) into the chamber 2 and stimulates the release of purified hydrogen from the intermetallic hydride through pipe 9, the valve 10 is opened into the cleaned hydrogen collection 11. Then release of impurities (which is determined experimentally) in chamber 2, valve 10 switches. and closes the outlets of pipes 8 and 9 and opens valve 12 through which impurities left in the hydride After removing pure hydrogen, and released from the at temperatures TtTd it, are reset either to atmosphere or to a special collector (not shown). After the end of the sorption process in chamber 1, valve 12 is closed, valve 6 is connected to source 7 through pipeline 5, chamber 2, valve 10 connects to collector 11 through pipeline 9, chamber 1 closes pipeline 8. Contaminated hydrogen 9 is absorbed in chamber 2, phase heat transition through the heat exchange wall 3 enters chamber 1 and purified hydrogen enters collector 11. When temperature TO reaches chamber 1, valve 10 closes pipelines 8 and 9, and valve 13 opens to discharge impurities from chamber 1. Thus, the cycle is repeated em with . After a certain number of cycles have been developed, a significant amount of difficult to remove impurities can accumulate in the hydride chambers of the system, which reduce the sorption capacity of the hydride. To restore the original properties of the hydride forming substance, heat transfer medium is periodically supplied to the chambers through the heat exchanger 15 (after a certain number of cycles has been developed). At that, valve 6 closes pipelines 4 and 5, valve 10 closes pipelines 8 and 9, and released impurities are discharged through valves 12 and 13. The economic efficiency of the invention is expressed in reducing the consumption of heat and coolant during hydrogen purification by the proposed device. Claim 1. Hydrogen purification device, comprising a housing, two sorbent layers separated by a partition, gas inlets and a gas outlet, characterized in that, in order to increase the efficiency of the cleaning process by reducing the heat cost of the desorption process, the partition is closed and the layers sorbent placed on the outer and inner sides of the partition. 2. A POP device 1, characterized in that the partition is zigzag-shaped. Sources of information taken into account in the examination 1. England patent 1537302, 01 D 53/26, 1978. 2. US patent number 3513631, cl. On 01 D 53/04, 1970. / /