Method for providing oxidant with stable flow and purity for oxygen rich combustion supporting of kiln

Abstract

The invention belongs to the technical field of air separation, and in particular discloses a method for providing an oxidant with stable flow and purity for oxygen rich combustion supporting of kiln. A conventional membrane separation device is improved, wherein the conventional membrane separation device comprises a membrane separator, an air filter, boosting equipment and vacuum equipment; according to the improvement, a first heat exchanger is arranged between the air filter and the boosting equipment, and a second heat exchanger and a related adjusting valve are arranged in back of the vacuum equipment; the first heat exchanger is used for introducing low-grade heat energy and preheating raw air; the second heat exchanger is used for introducing low-grade heat energy and heating permeating gas, wherein the permeating gas serving as the oxidant is fed into the kiln for supporting combustion; and when the flow or the oxygen purity of the oxygen rich air is greatly changed due to the change of the environmental temperature, the change is eliminated or lightened to a range of meeting the oxygen rich combustion supporting requirement by certain operation. By fully using the heat energy of the waste gas, the construction and running costs can be reduced, meanwhile, the stability of the system can be enhanced, and the total efficiency of the system is improved.

Description

technical field [0001] The invention belongs to the technical field of air separation, and in particular relates to a method for providing an oxidant for oxygen-enriched combustion of furnaces and kilns by adopting a membrane method oxygen enrichment technology. Background technique [0002] Oxygen-enriched, widely used in various fuel oil, gas, coal-fired furnaces (glass, cement, ceramics), various boilers, heating furnaces, incinerators, heat medium furnaces, hot blast stoves, smelting furnaces, aero engines, ship engines, etc. Combustion, energy saving and environmental protection; catalytic cracking, desulfurization, wastewater treatment, engine efficiency enhancement, oxygen-enriched gas (coal) production, various oxidation reactions, fermentation and other fields have also achieved good economic benefits by applying oxygen-enriched technology; in addition, oxygen-enriched It is also widely used in medical care, large-scale oxygen-enriched ventilation, plateau oxygen en...

AI Technical Summary

Problems solved by technology

Aiming at an oxygen-enriched combustion-supporting system that may be applied under various ambient temperature conditions, the ambient temperature of different installations and applications is different, and even the same place has different ambient temperatures in spring, summer, autumn and winter. Membrane separation that provides oxygen for oxygen-enriched combustion in furnaces The temperature change of the separated air in different places and seasons in the system will lead to huge changes in the flow rate and oxygen purity of the separated oxygen-enriched air

Obviously, the stability of the flow and purity of the oxygen system that provides oxygen-enriched air through membrane separation directly determines the effect of the oxygen-enriched combustion-supporting process. In a sense, if the stable oxidant supply method cannot be solved, the separation method The application of oxygen-enriched combustion system will be severely restricted

Images