Novel supercritical water oxidation comprehensive treatment system and method

Abstract

The invention relates to a novel supercritical water oxidation comprehensive treatment system. The novel supercritical water oxidation comprehensive treatment system comprises the following units: an oxidant supplying unit (1), a raw material supplying unit (2), a supercritical water oxidation desalination unit (3), a pressure energy recovery unit (4), a waste heat recovery unit (5), a carbon dioxide generating unit (6) and an evaporative water generating unit (7). A novel supercritical water oxidation comprehensive treatment method comprises the following steps: (1) supplying the oxidant; (2) supplying the raw material; (3) carrying out supercritical water oxidation desalination; (4) recovering pressure energy; (5) recovering waste heat; (6) generating carbon dioxide; and (7) generating evaporative water. By the novel supercritical water oxidation comprehensive treatment system and method, the phenomenon of clogging of a pipeline due to the deposition of salts cannot be caused, the deposition of salt substances on the wall of the reactor is avoided and the corrosion is decreased; since the waste water and pressure are recycled and the oxygen-enriched tail gas is also reused, the running cost is decreased; and by selling byproducts, namely, food-grade carbon dioxide and saturated steam, profits can be enlarged.

Description

technical field [0001] The invention relates to a supercritical sewage treatment reactor in the field of environmental protection technology, in particular to a novel supercritical water oxidation comprehensive treatment system and treatment method. Background technique [0002] Supercritical water oxidation (SCWO) technology was first proposed by American scholar Modell in the mid-1980s as a deep oxidation technology that can completely and thoroughly destroy the structure of organic matter. In "Energy and Environment", one of the six major fields listed in the US National Key Technologies, it is pointed out that the most promising waste treatment technology is the SCWO method. [0003] Supercritical water (SCW) refers to water in a special state with a temperature exceeding 374.15°C and a pressure exceeding 22.12Mpa. Under this condition, the dielectric coefficient of water is greatly reduced, and oxygen and various organic substances form a homogeneous phase in the water ...

AI Technical Summary

Problems solved by technology

However, the salt deposition in the preheating stage and the reactor will cause serious pipeline blockage and material corrosion, and it is difficult for many equipment to maintain stable operation, which greatly restricts the development of this technology

In addition, the high operating costs brought about by oxygen, hydrogen peroxide, etc. as oxidants also need to be resolved urgently.

Images