System and process for condensing and recovering nitrogen tetroxide waste gas resource

Abstract

The invention provides a system and a process for condensing and recovering a nitrogen tetroxide waste gas resource, which belong to the field of waste gas treatment. The system comprises a condensingheat exchanger, a gas-liquid separator, an electric control valve, a condensate collecting tank, a low-temperature water chilling unit, and an ethylene glycol water solution buffer and expansion tank. A pipeline of waste gas containing nitrogen tetroxide steam enters the condensing heat exchanger; a gas-liquid mixture outlet pipeline of the condensing heat exchanger is connected with the gas-liquid separator; the gas-liquid separator is connected with the condensate collecting tank through a gas communicating pipe. In the system, the low-temperature water chilling unit provides a cooling capacity for cooling the temperature of an ethylene glycol water solution to the operating temperature, the ethylene glycol water solution cools the waste gas containing the nitrogen tetroxide steam through heat exchange so as to achieve a supersaturated state, and nitrogen tetroxide is recovered through gas-liquid separation. In the process, the ethylene glycol water solution is not only an intermediate heat transfer working medium but also a cold storage working medium, so that the system is ensured to operate stably.

Description

technical field [0001] The invention belongs to the field of exhaust gas treatment, and in particular relates to a process flow and key technology for rocket liquid propellant exhaust gas treatment. Background technique [0002] Dinitrogen tetroxide is one of the most widely used rocket propellants, and is widely used in the fields of space launch and weapon equipment scientific research and testing. A large amount of exhaust gas will be generated during the work process of transfer, filling, warehouse return, temperature adjustment, and various equipment adjustments. According to GB5044-85 "Classification of Hazard Degree of Occupational Exposure to Toxic Substances", it is a highly toxic substance. For a long time, waste gas has been treated by high-altitude emission, combustion, or solution absorption, which not only increases the cost, causes secondary pollution, but also causes a large waste of resources. [0003] When the mixed gas is cooled to a certain temperature,...

AI Technical Summary

Problems solved by technology

The difficulty of condensate recovery of dinitrogen tetroxide is that the technical indicators of recovered products must meet the requirements of national standards and regulations, otherwise new harmful substances that need to be processed will be produced, and condensate recovery will be meaningless

Images