SU118832A1 - Installation for the preparation of protective atmosphere non-oxidative heating - Google Patents

Description

The invention relates to the field of plant structures for the preparation of a protective atmosphere of the type CO-H2-N2, used in the heat treatment of steel products.

Applied installations for obtaining a protective atmosphere of this type do not provide a sufficiently high coefficient and, using fuel and insufficiently clean the protective atmosphere from gases, oxidizing agents, require a large amount of working endothermic gas generators, and the regeneration of large amounts of silica gel in the desiccant desiccant is associated with unjustified overheating of the lower adsorbent layers and time consuming.

The described installation for the preparation of protective atmospheric oxygen (: non-oxidative heating fumes, consisting of the combustion chamber of the source gas, the endothermic electrically heated gas generator and the adsorber filled with silica gel, is free from these disadvantages. This is achieved by using a heat exchanger in front of the endgenerator, which makes it possible to use the heat of the hot gases from the combustion chamber, independent regulation of the degree of heating of the various zones of the gas generator due to two independently included elements in resistance (heater) and a uniform distribution of hot air adjustment desorbed bed of silica gel.

The protective atmosphere is prepared in the installation described by incomplete combustion of urban mixed gas (excess coefficient is 0.7), after which the gases are passed through a layer of wood coal heated to 1050 ° in an endothermic generator to reduce carbon dioxide and, in part, water vapor carbon monoxide and hydrogen. The gases recovered in the gas generator dry out of water vapor in the adsorber filled with silica gel. Periodic regeneration of silica gel from water is carried out by hot air flowing through its layer.

No. 118832

In the combustion chamber for the intensification of combustion, two lattices of porous ceramics, saturated with nickel nitrate salts, are placed. In front of the burner, a grid with a living cross section of 60–80% sheathed, its surface, and at the exit from the combustion chamber to improve the fit and ejector of a booster, is installed to better mix gas and air.

The endothermic gas generator is equipped with two surface electric heaters made of resistance wire, each of which is switched on independently, which makes it possible to rationally control the heating and ensures a better utilization of the working volume of the apparatus.

To accelerate the process of regenerating silica gel and eliminate overheating and drying of the lower layers of silica gel, which take place in the usual way of passing hot air from the bottom up through the entire layer of adsorbent, the adsorber is equipped with a distributor, which is a vertical pipe with holes inserted into the layer of silica gel along the central axis adsorber. Such a device ensures a uniform distribution of hot air throughout the entire layer of silica gel, which intensifies the desorption process (drying) and eliminates local overheating.

In the complex, all design changes will intensify the process of preparing the protective atmosphere and increase its efficiency.

Subject invention

An installation for preparing a protective atmosphere without oxidation heating, consisting of a combustion chamber, an endothermic gas generator with electric heating, refrigerators and an adsorber filled with silica gel, characterized in that, in order to intensify the process of obtaining a protective atmosphere, improve the composition of the latter and increase the use of heat, the installation equipped with a heat exchanger, which is at the same time a sieve for cleaning gases from soot, the gas generator is equipped with a second independently operating electrical system skim resistance heater and an adsorber has a vertical pipe with apertures disposed therein along the central axis, adapted to uniformly distribute the hot air adjustment desorbed bed of silica gel.