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CN-122010048-A - Integrated method and system for cyclic hydrogen production and condensation heat storage based on multifunctional catalysis-adsorbent sodium zirconate

CN122010048ACN 122010048 ACN122010048 ACN 122010048ACN-122010048-A

Abstract

The invention discloses a circulating hydrogen production and condensation heat storage integrated method and system based on multifunctional catalytic-adsorbent sodium zirconate, and relates to the technical field of biological carbon gasification circulating hydrogen production and condensation heat storage; the method comprises the steps of introducing a zirconia-sodium carbonate compound into a thermal storage reactor, utilizing concentrated solar energy to provide energy in a carrier gas atmosphere, simultaneously realizing separation of CO 2 and regeneration of Na 2 ZrO 3 through a carrier gas separation device, introducing regenerated Na 2 ZrO 3 into a hydrogen production reactor in a circulating way, and repeating the steps to complete continuous hydrogen production and thermal storage circulation. The invention skillfully couples the catalytic-adsorption hydrogen production performance and the heat storage performance of Na 2 ZrO 3 , constructs a high-efficiency circulation system, realizes the high-value utilization of biochar resources and the high-efficiency conversion and storage of concentrating solar energy, and has remarkable resource utilization value and environmental protection significance.

Inventors

  • ZHAO PENGFEI
  • GAN RUIFENG
  • LI JUN
  • WANG KE

Assignees

  • 江西水利电力大学

Dates

Publication Date
20260512
Application Date
20260210

Claims (10)

  1. 1. The integrated method for circularly producing hydrogen and condensing and storing heat based on the multifunctional catalytic-adsorbent sodium zirconate is characterized by comprising the following steps of: S1, introducing sodium zirconate, biochar and steam into a hydrogen production reactor for reaction to generate a zirconia-sodium carbonate compound, maintaining the self-heating operation of the hydrogen production reactor, condensing and dehydrating gas generated by the reaction, and recycling hydrogen; S2, introducing the zirconia-sodium carbonate compound obtained in the step S1 into a thermal storage reactor, performing high-temperature reaction by utilizing energy provided by concentrating solar energy in a carrier gas atmosphere, and simultaneously realizing separation and enrichment of carbon dioxide and obtaining regenerated sodium zirconate by a carrier gas separation device; And S3, circularly introducing the regenerated sodium zirconate obtained in the step S2 into a hydrogen production reactor, and repeating the reaction process of the step S1 to realize the recycling of the sodium zirconate and continuous hydrogen production.
  2. 2. The integrated method for circulating hydrogen production and condensation heat storage based on the multifunctional catalytic-adsorbent sodium zirconate according to claim 1, wherein in the step S1, the sodium zirconate comprises any one or more of sodium zirconate with purity of >99%, sodium zirconate containing specific impurities and sodium zirconate with different crystal forms, and the biochar is selected from one or two of bamboo charcoal and coconut charcoal.
  3. 3. The integrated method for cyclic hydrogen production and condensation and heat storage based on the multifunctional catalytic-adsorbent sodium zirconate according to claim 1, wherein in the step S1, the molar ratio of sodium zirconate to carbon element in biochar is 0.25:1-1:1.
  4. 4. The integrated method for cyclic hydrogen production and condensation and heat storage based on the multifunctional catalytic-adsorbent sodium zirconate according to claim 1, wherein in step S1, the reaction temperature of the hydrogen production reactor is controlled to be 600-700 ℃.
  5. 5. The integrated method for cyclic hydrogen production and condensation and heat storage based on multifunctional catalytic-adsorbent sodium zirconate according to claim 1, wherein in step S1, the purity of the hydrogen is not less than 85%, and no CH 4 by-product exists.
  6. 6. The integrated method for cyclic hydrogen production and condensation and heat storage based on multifunctional catalytic-adsorbent sodium zirconate according to claim 1, wherein in step S2, the temperature of the high-temperature reaction is controlled to be 750-1000 ℃.
  7. 7. The integrated method for cyclic hydrogen production and condensation and heat storage based on sodium zirconate as a multifunctional catalyst-adsorbent according to claim 1, wherein the carrier gas atmosphere used in step S1 and step S2 is any one of an inert atmosphere without carbon dioxide or an atmosphere containing carbon dioxide.
  8. 8. The integrated method for circulating hydrogen production and condensation heat storage based on multifunctional catalytic-adsorbent sodium zirconate according to claim 1, wherein the circulating attenuation rate of sodium zirconate is lower than 10% after 10 hydrogen production-heat storage cycles.
  9. 9. A circulating hydrogen production and condensation heat storage system based on multifunctional catalytic-adsorbent sodium zirconate, which is applied to the method as set forth in any one of claims 1-8, and is characterized by comprising a hydrogen production reactor in which sodium zirconate and biochar are placed; The condensation separation device is communicated with the outlet of the hydrogen production reactor to condense and remove water to obtain hydrogen; The heat storage reactor is communicated with the hydrogen production reactor and is provided with a carrier gas channel; and a carrier gas separation device which is communicated with the outlet of the thermal storage reactor to separate CO 2 gas with the enrichment concentration of >99 percent, and simultaneously obtain regenerated sodium zirconate.
  10. 10. The system of claim 9, wherein the thermal storage reactor has concentrated solar energy components disposed thereon.

Description

Integrated method and system for cyclic hydrogen production and condensation heat storage based on multifunctional catalysis-adsorbent sodium zirconate Technical Field The invention relates to the technical field of biochar gasification hydrogen production and heat storage, in particular to a multifunctional catalysis-adsorbent sodium zirconate-based integrated method and system for circulating hydrogen production and condensation heat storage. Background The hydrogen energy becomes the key of clean transformation of energy sources due to the advantages of zero carbon and high energy density, but the main stream hydrogen production technology has the bottleneck that the carbon emission of the fossil fuel reforming hydrogen production is high, the cost of water electrolysis hydrogen production is high, the power grid is relied on for peak shaving, and the large-scale application is limited. The biomass resource is clean and renewable, has wide sources and sufficient reserves (accounting for 38 percent of primary energy consumption in developing countries), is neutral in carbon and low in nitrogen and sulfur, and is an ideal raw material for preparing green hydrogen. The annual biomass energy resource of China reaches 69.8 hundred million tons, and the annual near 6 hundred million tons of agriculture and forestry waste materials are directly combusted, so that the resources are wasted, the environment is polluted, and the problem can be solved by hydrogen production by non-combustion utilization. The gasification technology is a biomass hydrogen production core path, but the prior art has low gasification activity, low H 2 concentration and high energy consumption of the reactor. Although the enhanced gasification hydrogen production integrates multiple processes, improves the efficiency and has flexible raw materials, the established demonstration device of the Meihou is trapped by CO 2 trapping and system energy consumption, the calcium-based trapping agent needs to run at low temperature (800 ℃), the catalytic weak and difficult yield sufficient CO 2, the activity after 20 times of circulation is less than initial 30%, and the cost is high. Meanwhile, the solar photo-thermal and other clean energy reserves are large, but the utilization rate is low and unstable, and in the existing hydrogen production and heat storage coupling technology, the conventional catalysis/adsorbent has single function, complex system, large energy consumption and poor circulation stability. Therefore, the research and development of multifunctional materials with catalysis, CO 2 trapping and heat storage functions is important to construct an integrated system. Sodium zirconate (Na 2ZrO3) has excellent circulation stability, can synchronously realize high-efficiency catalysis at the hydrogen production end and CO 2 adsorption, and high-efficiency heat storage and heat release at the heat storage end, is expected to solve the problems in the prior art, and provides a new path for the collaborative development of biomass hydrogen production and clean energy storage. Disclosure of Invention The invention aims to at least solve one of the technical problems in the prior art and provides a circulating hydrogen production and condensation heat storage integrated method and system based on multifunctional catalytic-adsorbent sodium zirconate. The technical scheme of the invention is as follows: An integrated method for cyclic hydrogen production and condensation heat storage based on multifunctional catalysis-adsorbent sodium zirconate comprises the following steps: s1, introducing sodium zirconate, biochar and steam into a hydrogen production reactor for reaction to generate a zirconia-sodium carbonate compound, condensing and dehydrating gas generated by the reaction, and recycling hydrogen; S2, introducing the zirconia-sodium carbonate compound obtained in the step S1 into a thermal storage reactor, performing high-temperature reaction by utilizing energy provided by concentrating solar energy in a carrier gas atmosphere, and simultaneously realizing separation and enrichment of carbon dioxide and obtaining regenerated sodium zirconate by a carrier gas separation device; and S3, circularly introducing the regenerated sodium zirconate obtained in the step S2 into a hydrogen production reactor, repeating the reaction process in the step S1, releasing the heat of the heat storage reactor in the hydrogen production reaction by taking the sodium zirconate as an intermediate heat storage body, maintaining the self-heating operation of the hydrogen production reaction, and realizing the recycling of the sodium zirconate and continuous hydrogen production. Preferably, in step S1, the sodium zirconate includes any one or more combination of high purity sodium zirconate (purity > 99%), sodium zirconate containing specific impurities, sodium zirconate of different crystal forms. Preferably, in step S1, the biochar is selected from one or a com