System and method for treating organic hazardous waste by combining supercritical water partial oxidation and catalytic gasification

Abstract

The invention discloses a system and method for treating organic hazardous waste by combining supercritical water partial oxidation and catalytic gasification. The system comprises a heater 3, a supercritical water gasification reactor 4, a gas-liquid separator 5 and a drain tank 7 which are sequentially connected, wherein organic hazardous waste is transferred to the supercritical water gasification reactor 4 through the heater 3 to produce a gas-liquid mixture, and the gas-liquid mixture is further transferred to the gas-liquid separator 5 for gas-liquid separation. According to the invention, a supercritical water partial oxidation process and a supercritical water catalytic gasification process are combined; and compared with the traditional process of treating hazardous waste through a supercritical water oxidation method, the system and method disclosed by the invention are operated by reference to the internal temperature of the reactor rather than the oxygen gas amount of a waste COD (chemical oxygen demand) concentration control and addition system, so that the controllability of the internal temperature of the reactor is increased, the oxygen gas consumption is effectively reduced, self heating inside the system is realized, and oxidation corrosion of equipment is reduced.

Description

technical field [0001] The invention belongs to the field of hazardous waste treatment, and in particular relates to a system and method for supercritical water partial oxidation combined with catalytic gasification to treat organic hazardous waste. Background technique [0002] With the rapid development of the global economy and the diversification of the industrial structure, the generation of hazardous waste is increasing rapidly, and there are various types, complex components, and harmful characteristics such as toxicity, explosion, flammability, corrosion, and chemical reactivity. Cause serious harm to human health and the environment, and this harm has long-term, latent and hysteresis. If not handled properly, it will pose a great threat to human survival and the environment. Due to the high stability of hazardous waste in nature, it is not easy to be degraded, and the treatment technology is difficult. The hazardous treatment industry in my country only started aro...

AI Technical Summary

Problems solved by technology

The disadvantages are: first, the composition of organic hazardous waste is complex, its shape and properties are changeable, the degradation efficiency of supercritical water gasification is low, and it is difficult to discharge the treated water up to the standard; Endothermic reaction requires external heat supply, high energy consumption, and low heating efficiency, which leads to tar and blockage in the reactor; third, due to the characteristics of organic hazardous waste itself, hydrogen and The amount of methane is small and difficult to use effectively, and direct emission causes energy waste

Compared with the supercritical water gasification method, the supercritical water oxidation method releases a large amount of heat during the oxidation reaction, realizes the self-heating of the reaction system, and has high heating efficiency and reaction temperature, thereby improving the degradation efficiency of organic hazardous waste , can completely degrade organic matter, but adding too much oxidant, on the one hand, consumes the combustible gas produced by the system, on the other hand, the reactor is prone to oxidation and corrosion, and the internal temperature of the reactor is difficult to control, thus reducing the service life of the equipment

Images