Ultrahigh-temperature gas cooled reactor hydrogen-electricity co-production system and method
A gas-cooled reactor and ultra-high temperature technology, which is applied to chemical instruments and methods, hydrogen production, and greenhouse gas reduction, and can solve problems such as systems without externally designed heat supply, scrapped evaporators, and large fluctuations in evaporator outlet pressure , to achieve the effect of avoiding the instability of two-phase flow flow, avoiding the conversion of dry and wet states, and ensuring the safety of working fluid
Active Publication Date: 2022-06-07
XIAN THERMAL POWER RES INST CO LTD
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Problems solved by technology
[0004]
(1) The outlet temperature of the high-temperature gas-cooled reactor is 750°C, which cannot provide the high-temperature heat source above 800°C required for sulfur-iodine cycle hydrogen production
[0005]
(2) No external heat supply system is designed;
[0006]
(3) The structure of the system is complex, especially the manufacture and operation of the once-through evaporator is difficult
[0007]
(4) In the high-temperature gas-cooled reactor nuclear power plant demonstration project currently under construction, the evaporator heat exchange tube contains 14MPa, 570°C steam, and the outside of the heat exchange tube contains 7MPa, 750°C helium gas with radioactive graphite dust. Very dangerous after leaking in operation
[0008]
(5) There is no way to change the tube after the heat exchange tube fails. The leakage of one heat exchange tube under heavy load will damage the adjacent heat exchange tube. The damage of a large number of heat exchange tubes will affect the output of the unit, and even make the evaporator scrapped
[0009]
(6) In the start-stop stage and the dry-wet state transition stage, the feedwater flow temperature and flow rate at the evaporator inlet are difficult to control, the evaporator outlet pressure fluctuates greatly, and the main steam temperature changes drastically, which affects the operation safety of the evaporator and steam turbine
[0010]
(7) The unit needs to be cooled for a long time after the accident shutdown to establish the water cycle start again, which affects the availability and economy of the unit
Method used
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Embodiment
[0054] The high temperature gas-cooled reactor demonstration project currently under construction, the reactor outlet helium temperature is 750 ℃. The secondary circuit adopts a steam turbine power generation system. The conventional island is equipped with a circulating water system, a condensate water system, a deaerator system, a main water supply system, a steam generator, a main steam system, a steam turbine generator system, and a demineralized water preparation system. The single reactor power of the working condition reactor is 250MW, the external power generation is 100MW, and the power generation efficiency is 40%.
[0055] Sulfur-iodine (SI) cyclic hydrogen production is a cyclic hydrogen production method that splits water into hydrogen and oxygen through a series of thermochemical processes. The whole cycle includes the following 3 reactions:
[0056] (1)I 2 +SO 2 +2H 2 O→2HI+H 2 SO 4 (20~100℃) (Bunsen reaction)
[0057] (2)H 2 SO 4 →SO 2 +H 2 +0.5O ...
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According to the system, the ultrahigh-temperature gas cooled reactor, sulfur-iodine circulating hydrogen production and supercritical carbon dioxide power generation are coupled for hydrogen-power co-production, and the system comprises an ultrahigh-temperature gas cooled reactor module, a first heat exchanger, a second heat exchanger, a third heat exchanger and the like; the method comprises the following steps: establishing helium loop pressure and helium circulation; establishing carbon dioxide loop pressure and carbon dioxide circulation; establishing carbon dioxide loop pressure and carbon dioxide circulation; establishing carbon dioxide loop pressure and carbon dioxide circulation; the supercritical carbon dioxide power generation cycle is more remarkable in efficiency advantage under the condition of high temperature parameters, and is more matched with the positioning of the high-temperature gas cooled reactor.
Description
technical field [0001] The invention belongs to the technical field of nuclear power and hydrogen production, and in particular relates to a system and method for co-generation of hydrogen and electricity for an ultra-high temperature gas-cooled reactor. Background technique [0002] At present, the high-temperature gas-cooled reactor demonstration power station uses the once-through evaporator to heat water with the heat generated by the reactor to generate steam, which drives the steam turbine to generate electricity. [0003] The system has the following problems: [0004] (1) The outlet temperature of the high temperature gas-cooled reactor is 750°C, which cannot provide a high-temperature heat source above 800°C required by the sulfur-iodine cycle for hydrogen production. [0005] (2) There is no external heating system designed; [0006] (3) The structure of the system is complicated, especially the manufacture and operation of the once-through evaporator are difficu...
Claims
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IPC IPC(8): C01B3/04G21C15/28F01D15/10F01K7/32F01K25/10
CPCC01B3/042F01K25/103F01K7/32F01D15/10G21C15/28Y02E30/30
Inventor马晓珑张一帆李长海张瑞祥
OwnerXIAN THERMAL POWER RES INST CO LTD