Intermediate medium heat exchanger used for supercritical water oxidation system

Abstract

The invention discloses an intermediate medium heat exchanger used for a supercritical water oxidation system and belongs to the technical field of environmental protection and chemical industry. The intermediate medium heat exchanger comprises a material major loop and an intermediate medium loop. The material major loop is composed of a material pump, a preheater, a water spray desuperheater, a reactor and a regenerator which are connected in sequence. The intermediate medium loop is composed of a buffer tank, a circulating pump, the regenerator, the preheater and a water cooler which are connected in sequence. The top of the buffer tank is provided with a back pressure valve. The intermediate medium heat exchanger further comprises a water supplement branch path. A desuperheating water pump is arranged on the water supplement branch path. The path of an outlet of the desuperheating water pump is divided into two branch paths, one branch path is connected with the water spray desuperheater, and the other branch path is connected with the buffer tank. The intermediate medium heat exchanger used for the supercritical water oxidation system is reasonable in structural design, the investment cost of the system can be reduced maximally, and stable operation of the system is ensured.

Description

technical field [0001] The invention belongs to the technical field of environmental protection and chemical industry, and in particular relates to an intermediate medium heat exchange device used in a supercritical water oxidation system. Background technique [0002] Supercritical Water Oxidation (SCWO) technology utilizes the special properties of supercritical water (T>374.15°C, P>22.1MPa) between liquid and gaseous states, that is, the dielectric constant is similar to that of non-polar organic solvents, and has high The diffusion coefficient and low viscosity can be completely miscible with most organic substances, oxygen, carbon dioxide and other non-polar molecules, so that refractory organic substances can undergo rapid and thorough homogeneous oxidation reactions in supercritical water. One of the six areas listed in "Energy and Environment" is defined as the most promising wastewater treatment technology. [0003] The supercritical water oxidation reaction ...

AI Technical Summary

Problems solved by technology

However, since the materials before and after the reaction are generally highly corrosive, the heat exchanger for direct heat exchange needs to use expensive corrosion-resistant materials and design a thicker corrosion allowance, resulting in extremely high investment in the heat exchanger. In addition, Problems such as fluctuations in reaction heat release and heat exchanger efficiency will lead to insufficient preheating or overheating of materials. Therefore, it is necessary to build a supercritical water oxidation system that can reduce operating costs and investment costs and operate reliably. intermediate medium heat exchange device

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