Novel transpiring wall reactor for supercritical sewage treatment

Abstract

The invention relates to a novel transpiring wall reactor for supercritical sewage treatment. The reactor mainly comprises an upper end flange, a cylinder, a lower end flange, a top connector, a burner assembly and transpiring walls, wherein the upper end flange, the cylinder and the lower end flange are fixedly installed, and a sealed space is formed; the top connector is connected with the burner assembly, then is fixedly installed in the center of the upper end flange and is provided with a fuel inlet; a liquid outlet is formed in the lower end flange. The novel transpiring wall reactor is characterized in that the cylinder is provided with multiple layers, the multi-layer cylinder comprises an upper cylinder body and multiple middle cylinder bodies, the upper cylinder body and the upper end flange are fixedly installed, the multiple middle cylinder bodies are fixedly installed through middle rings, the transpiring walls are fixedly installed on the insides of the middle cylinder bodies, a sealed narrow gap is formed between the outer surface of each transpiring wall and the inner surface of each middle cylinder body and a transpiring wall water inlet communicated with each sealed narrow gap is formed in the corresponding middle cylinder body. The novel transpiring wall reactor is scientific and reasonable in structural design, can effectively avoid a pyrolytic reaction in a sewage pre-heating tube, settlement of salt and the like, and has the advantages of simple structure, convenience for disassembly and assembly and easiness of overhaul and maintenance.

Description

technical field [0001] The invention relates to a supercritical water oxidation reactor in the field of environmental protection technology, in particular to a novel evaporation wall reactor for supercritical sewage treatment. 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 oxidants and various organic substances form a homogeneous phase in the water system, eliminating m...

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Problems solved by technology

[0004] However, due to the harsh conditions of the supercritical water oxidation reaction at 374.15°C and 22.12Mpa, many processes are difficult to maintain stable operation, so in many processes, the wastewater and oxidant fluid are preheated to supercritical conditions and enter the reactor, so that in the preheating stage The occurrence of salt precipitation, coke and tar caused by reactions such as pyrolysis and cracking, the problem of pipeline blockage, material corrosion and nozzle vulnerability have greatly restricted the development of this technology.

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