Air-carrying tritium-containing wastewater system with condensation dehumidification function

Abstract

The invention relates to an air-carrying tritium-containing wastewater system with a condensation dehumidification function, and belongs to the technical field of spent fuel post-treatment. The air-carrying tritium-containing wastewater system comprises an absorption type refrigeration condensation dehumidification device and an efficient micro-fog humidification device. The absorption type refrigeration condensation dehumidification device comprises a fan, a dust removal chamber, a condensation dehumidifier, an air duct heater, a heat source, a generator, a condenser, an evaporator, an absorber, an intermediate heat exchanger, a first throttling valve, a first circulating pump and a second throttling valve. By additionally arranging the dehumidification device, the air carrying capacity is improved, and a traditional one-step method is changed into a two-step method, so that the operation performance of the air-carrying tritium-containing wastewater system in severe environments such as low temperature and high humidity is improved. An absorption refrigeration mechanism ensures that the dehumidifier operates at a lower temperature through chilled water of the evaporator, so that the dehumidification effect is ensured; and according to the efficient micro-fog humidification, graded humidification and micro-fog humidification are combined, wet air containing low-radioactivity waste liquid is formed through a multi-stage humidifier, and efficient carrying of the low-radioactivity waste liquid is achieved.

Description

technical field [0001] The invention belongs to the technical field of spent fuel reprocessing, and specifically relates to absorption refrigeration technology, condensation dehumidification technology, air-carrying low-radioactive waste liquid post-processing technology and air-carrying technology. Background technique [0002] A typical process for spent fuel reprocessing adopts the traditional Purex process. When the spent fuel core is dissolved by nitric acid, a large amount of tritium is converted into tritiated water (HTO) or tritiated acid (TNO 3 ) form into the solution. For every ton of spent fuel processed, about 5-10 m 3 High level solution. The high-level solution is evaporated and concentrated, and more than 90% of the tritium is released into the condensate of the secondary steam, eventually forming a large amount of 10 7 ~10 9 Bq / L low-concentration tritium-containing wastewater. Tritium in tritiated wastewater exists in the form of HTO, which is diffic...

AI Technical Summary

Problems solved by technology

[0005] Whether it is a hanging cloth scheme or a high-pressure micro-mist scheme, the current process of carrying tritium-containing wastewater in the air has the following shortcomings: In the low-temperature environment in winter, the outdoor ambient temperature is far lower than the dew point temperature of the discharged air, which cannot be effectively discharged Tritium-containing wastewater; in a high-humidity environment, the moisture absorption capacity of the carrier air is limited by the ambient humidity, resulting in low discharge efficiency in a high-humidity environment, and cannot effectively cope with the increasing amount of tritium-containing wastewater; the existing discharge The strategy is to discharge 1°C lower than the ambient air temperature, which lacks environmental adaptability and cannot adjust the emission according to changes in the ambient temperature. When the ambient temperature rises, the carrying capacity of the air is not fully utilized, resulting in low emission efficiency. When the ambient temperature drops, the constant discharge temperature will cause precipitation; the system needs to consume a lot of external energy, and the energy utilization efficiency is low

Therefore, the energy utilization efficiency of the existing post-treatment system is low, the humidification efficiency is low, and the ambient temperature and humidity have a great impact on the discharge of tritium-containing wastewater. The humidification effect becomes worse or even impossible to humidify, and the tritium-containing wastewater discharge facilities are difficult to operate, which seriously limits the operation cycle of the reprocessing plant

Images