CN-122015522-A - System for recycling hydrogen reduction tail gas and application method

CN122015522ACN 122015522 ACN122015522 ACN 122015522ACN-122015522-A

Abstract

The invention relates to the technical field of uranium conversion, in particular to a system for recycling hydrogen reduction tail gas and a using method thereof. The device comprises a condensation module, a bubbling tank, a heat exchange module and a membrane pressure module. The recovery and utilization of the process tail gas are realized by condensing, dedusting, freezing and dewatering, pressurizing and the like the hydrogen reduction process tail gas, the direct waste of excessive hydrogen in the hydrogen reduction reaction is avoided, the production and operation cost is greatly saved, and the energy utilization efficiency is improved.

Inventors

XU HAO
HE NI
ZHOU SHAOQIANG
ZHANG PEIREN
HAO LEISHENG
QIN HAOCHEN
Zhi Hongqiang

Assignees

中核第七研究设计院有限公司

Dates

Publication Date: 20260512
Application Date: 20260331

Claims (8)

1. The system for recycling the hydrogen reduction tail gas is characterized by comprising a condensation module, a bubbling tank (2), a heat exchange module and a membrane pressure module; The condensation module is communicated with the condensate water storage tank and is used for condensing tail gas generated in the hydrogen reduction process and guiding condensate water generated in the condensation process into the condensate water storage tank; the bubbling tank (2) is communicated with the condensation module and is used for removing trace uranium-containing dust in tail gas of a hydrogen reduction process; The heat exchange module is communicated with the bubbling tank (2) and is used for freezing the gas discharged by the freezing bubbling tank (2) and removing the moisture in the gas; The membrane pressure module is communicated with the heat exchange module and is used for collecting gas exhausted by the heat exchange module and pressurizing the gas to 0.2MPa.
2. The system for recycling the hydrogen reduction tail gas according to claim 1, wherein the condensing module comprises a condenser (1), a first air guide pipeline, a second air guide pipeline and a cooling water circulating pipeline, wherein the first air guide pipeline is communicated with the condenser (1) and is used for guiding the hydrogen reduction tail gas into the condenser (1) to be condensed, the second air guide pipeline is communicated with a bubbling tank (2) and is used for guiding the hydrogen reduction tail gas subjected to condensation treatment into the bubbling tank (2), the cooling water circulating pipeline is used for guiding cooling water into the condenser (1), and a condensed water storage tank communicated with the first air guide pipeline is arranged below the condenser (1).
3. The system for recycling hydrogen reduction tail gas according to claim 1, further comprising an exhaust tail gas pipeline, wherein one end of the exhaust tail gas pipeline is communicated with the bubbling tank (2), the other end of the exhaust tail gas pipeline is communicated with the heat exchange module, a flowmeter and a pneumatic regulating valve are arranged on the exhaust tail gas pipeline, and 15% of total circulating gas flowing through the exhaust tail gas pipeline is exhausted through the flowmeter and the pneumatic regulating valve.
4. The system for recycling hydrogen reduction tail gas according to claim 1, wherein the heat exchange module comprises a heat exchanger (3), a U-shaped exhaust pipe, an ethylene glycol water inlet pipe and an ethylene glycol water return pipe, wherein the ethylene glycol water inlet pipe and the ethylene glycol water return pipe are communicated with the heat exchanger (3) and used for guiding a refrigerant of the heat exchanger (3) in from one side of the heat exchanger (3) and guiding the refrigerant out from the other side of the heat exchanger, the heat exchanger (3) is communicated with an exhaust tail gas pipeline and used for freezing inflow gas, the U-shaped exhaust pipe is used for guiding the frozen gas out, a U-shaped bend and a drain valve are arranged on the U-shaped exhaust pipe and used for guiding condensed water into a condensed water storage tank.
5. The system for recycling hydrogen reduction tail gas according to claim 4, wherein the membrane pressure module comprises two gas buffer tanks (4), a membrane press (5) and a communication pipeline, the two gas buffer tanks (4) are respectively positioned at two sides of the membrane press (5) and are respectively used for pressurizing inflow gas, the membrane press (5) is used for pressurizing inflow gas, and the communication pipeline is used for sequentially communicating the two gas buffer tanks (4) and the membrane press (5) and returning the gas to the hydrogen reduction reaction for reuse.
6. The system for recycling hydrogen reduction tail gas according to claim 2, wherein the condenser (1) is a water-cooled shell-and-tube heat exchanger, the cooling water passes through a shell side of the water-cooled shell-and-tube heat exchanger, and the hydrogen reduction tail gas passes through a tube side of the water-cooled shell-and-tube heat exchanger.
7. The system for recycling hydrogen reducing tail gas according to claim 4, wherein the refrigerant of the heat exchanger (3) is ethylene glycol at-5 ℃.
8. The method for using a hydrogen reducing off-gas recycling system according to any one of claims 1 to 7, comprising the steps of: S1, carrying out heat exchange and cooling on the tail gas of the hydrogen reduction process in a condenser (1), cooling to 60 ℃, and automatically flowing into a condensate water storage tank below after condensing water vapor in the tail gas of the process; S2, introducing process tail gas at an outlet of the condenser (1) into a bubbling tank (2) for bubbling dust removal to remove trace uranium-containing dust entrained in the process tail gas, wherein the process tail gas at the outlet of the bubbling tank (2) is emptied by 15% of total circulating gas in an emptying tail gas pipeline, and the rest tail gas enters a heat exchanger (4) for retreatment; S3, freezing and dewatering treatment is carried out on the process tail gas and ethylene glycol at the temperature of minus 5 ℃ in the heat exchanger (4), temperature detection is respectively arranged at an inlet and an outlet of the heat exchanger (4) to judge whether the tail gas is dewatered or not, and condensate water generated by the freezing and dewatering treatment flows into a condensate water storage tank at a U-shaped bend of the U-shaped exhaust pipe and a drain valve. S4, enabling process tail gas at an outlet of the heat exchanger (4) to enter a gas buffer tank (4) at one side of the film press (5) for pressure stabilization, then entering the film press (5) for pressurization, and entering the gas buffer tank at the other side of the film press (5) after the process tail gas is pressurized to 0.2 MPa; s5, after the process tail gas is stabilized in the gas buffer tank (4), replenishing fresh hydrogen, and conveying the replenishing fresh hydrogen back to the hydrogen reduction reactor through the communication pipeline for reuse.

Description

System for recycling hydrogen reduction tail gas and application method Technical Field The invention relates to the technical field of uranium conversion, in particular to a system for recycling hydrogen reduction tail gas and a using method thereof. Background In the uranium conversion production process, hydrogen is needed to be used as a reducing agent to reduce uranium trioxide into uranium dioxide, and in order to ensure the conversion rate of hydrogen reduction reaction, the excess hydrogen is usually controlled to be more than 80%. The tail gas of the hydrogen reduction process comprises excessive hydrogen, nitrogen, steam generated by reaction and trace uranium-containing powder. At present, the hydrogen reduction reaction tail gas of the domestic uranium conversion plant is ignited, burned and emptied after simple treatment, and excessive hydrogen in the tail gas is directly burned, so that great waste of energy is caused. If the excessive hydrogen in the hydrogen reduction tail gas can be recycled, the production cost can be greatly saved. Therefore, a solution is urgently needed. Disclosure of Invention The invention aims to solve the technical problem of providing a system for recycling hydrogen reduction tail gas and a use method thereof, wherein the method realizes recycling of the process tail gas by condensing, dedusting, freezing and dewatering, pressurizing and the like the hydrogen reduction process tail gas, avoids direct waste of excessive hydrogen in the hydrogen reduction reaction, greatly saves production and operation costs and improves energy utilization efficiency. In order to achieve the purpose, the technical scheme of the invention is realized in such a way that the system for recycling the hydrogen reduction tail gas and the using method thereof comprise a condensation module, a bubbling tank, a heat exchange module and a membrane pressure module; The condensation module is communicated with the condensate water storage tank and is used for condensing tail gas generated in the hydrogen reduction process and guiding condensate water generated in the condensation process into the condensate water storage tank; The bubbling tank is communicated with the condensation module and is used for removing trace uranium-containing dust in tail gas of the hydrogen reduction process; the heat exchange module is communicated with the bubbling tank and is used for freezing the gas discharged by the freezing bubbling tank and removing the moisture in the gas; The membrane pressure module is communicated with the heat exchange module and is used for collecting gas exhausted by the heat exchange module and pressurizing the gas to 0.2MPa so as to meet the pressure requirement of hydrogen reduction reaction gas. The condensation module comprises a condenser, a first air guide pipeline, a second air guide pipeline and a cooling water circulation pipeline, wherein the first air guide pipeline is communicated with the condenser and guides hydrogen reduction process tail gas into the condenser for condensation, the second air guide pipeline is communicated with a bubbling tank and is used for guiding the hydrogen reduction process tail gas subjected to condensation treatment into the bubbling tank, the cooling water circulation pipeline is used for guiding cooling water into the condenser, and a condensed water storage tank communicated with the cooling water storage tank is arranged below the condenser. The system is characterized by further comprising an exhaust tail gas pipeline, wherein one end of the exhaust tail gas pipeline is communicated with the bubbling tank, the other end of the exhaust tail gas pipeline is communicated with the heat exchange module, a flowmeter and a pneumatic regulating valve are arranged on the exhaust tail gas pipeline, and 15% of total circulating gas flowing through the exhaust tail gas pipeline is exhausted through the flowmeter and the pneumatic regulating valve. The heat exchange module comprises a heat exchanger, a U-shaped exhaust pipe, an ethylene glycol water inlet pipe and an ethylene glycol water return pipe, wherein the ethylene glycol water inlet pipe and the ethylene glycol water return pipe are both communicated with the heat exchanger and used for guiding a refrigerant of the heat exchanger from one side of the heat exchanger and guiding the refrigerant out of the other side of the heat exchanger, the heat exchanger is communicated with an exhaust tail gas pipeline and used for freezing inflow gas, the U-shaped exhaust pipe is used for guiding out the frozen gas, and a U-shaped bend and a drain valve are arranged on the U-shaped exhaust pipe and used for guiding condensed water into a condensed water storage tank. Preferably, the membrane pressure module comprises two gas buffer tanks, a membrane press and a communication pipeline, wherein the two gas buffer tanks are respectively positioned at two sides of the membrane press and are respectively used