SU899454A1 - Process for producing hydrogen - Google Patents

Description

(54) METHOD FOR PRODUCING HYDROGEN

I

The invention relates to technological processes for the production of energetics, for example hydrogen, nanosecond hydride compounds of rare earth metals and intermetallic compounds, which are housed in special containers that can be widely used in metallurgy in the process of reducing iron ore, in mechanical engineering, in converting chemical energy into electrical energy, for supplying consumers with hydrogen.

A known method of producing hydrogen by thermal decomposition of intermetallic hydrides by heat transfer through the wall of the heat exchanger 1.

The disadvantage of this method is the lack of uniform heat supply, which leads to an uneven distribution of hydrogen.

Closest to the proposed technical essence and the achieved result is. A method of producing hydrogen by thermal decomposition of intermetallic hydrides by displacing hydrogen with another metal 2.

The disadvantage of this method is the uneven hydrogen evolution, since the conditions of heat transfer do not allow to uniformly heat the entire volume of the hydride allow a temperature difference of 30-50 ° C, which is unacceptable.

The purpose of the invention is to intensify the process by providing a more uniform release of hydrogen.

This goal is achieved by the method of producing hydrogen by thermal decomposition of nonmetallic hydrides in which the thermal decomposition of intermetallic compounds is carried out by introducing into their volume a hydrocarbon with a temperature of 50-270 C.

Claims (2)

In this case, saturated hydrocarbons Syu-Cis are used as hydrocarbons. This method allows the process of thermal decomposition of ingermetallic hydrides more intensively by ensuring more uniform heating of hydrides. In this case, the temperature difference does not exceed 5 ° С. 389 The adopted temperature range for the heating of 50-27 and C hydrogen sulfides is due to a decrease in the lower limit of the temperature, a sharp decrease in the activity of the desorption process, the hydrogen productivity is minimal, the pressure is less than 1 MPa, which does not meet the technological needs and the increase in the upper temperature limit is more than 270 C , which leads to the destruction of the intermetallic compound, as a result of which its multiple use is excluded, its use in adsorption and desorption processes. The use of saturated hydrocarbons CIQ-CIS due to their thermophysical properties, which are listed in the table. Example 1. LaNisH intermetallic acid hydride is thermally decomposed. Heating is carried out up to temperature IJU to obtain a hydrogen pressure of 5, mPa at the outlet of the reactor. To exclude, pentadecane () is introduced into the hydride volume (). The amount of heat required for the hydrogen generation process under a pressure of 5 MPa is determined from the equation, -M, -At, -fq 1025-M30 + 0.1510 C5.1310 J / kg, where d tj - is determined from the condition of the initial temperature of the hydride 20 ° C; C | - specific heat capacity of the hydride, j / kg hail; MI is the mass of the intermetallic hydride, kg; q is the heat of the endothermic reaction. In this case, at a temperature of 50, 60, 70, 80, 90, 100, 120, 150, 180 and 210 ° C, the heat capacity is 410, 420, 480, 680, 910, 970, lOOO, 1025, 1045 and 1060 .grad respectively. The technical and economic efficiency of the proposed method for producing hydrogen from intermetallic hydrides consists in intensifying the process of hydrogen production with predetermined operating parameters — capacity and pressure compared to existing methods by 50–80%, and hydrogen pressure control efficiency by ensuring high temperature uniformity. in the whole volume of the intermetallic hydride. Claim 1. Hydrogen production method by thermal decomposition of intermetallic hydrogen sulfides, characterized in that, in order to intensify the process by providing more uniform hydrogen generation, thermal decomposition of intermetallic hydrides is carried out by introducing into their volume a hydrocarbon with a temperature of 50-270 ° C. 2 . The method according to claim .1, about tl and h and w and w and the fact that as a hydrocarbon using saturated hydrocarbons. Sources of information taken into account in the examination 1. Andrievsky R. А. Atomna equipment abroad. 1976, K 12, p. 24 2. USSR author's certificate for application number 2818132 / 23-26, cl. From 01 to 3/00, 14.09.79.