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Chemical chain reaction system and method driven by high-nitrogen-content biomass

A biomass and high nitrogen content technology, applied in chemical instruments and methods, biofuels, inorganic chemistry, etc., can solve the problems of lack of energy coupling in the chemical chain ammonia synthesis system, high energy consumption in the air separation process, wear and tear of nitrogen carrier, etc. Achieve the effects of improving mechanical strength and wear resistance, realizing energy recovery and increasing service life

Pending Publication Date: 2022-04-08
XI AN JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the above-mentioned shortcoming of the prior art, the object of the present invention is to provide a kind of chemical chain reaction system and method driven by biomass with high nitrogen content, to solve the problem of separating N in the air in the process of synthesizing ammonia. 2 As a nitrogen source, the nitrogen source is single, the energy consumption of the air separation process is too large, the wear of the nitrogen carrier in the fluidized bed reactor is serious, and the chemical chain ammonia synthesis system lacks energy coupling.

Method used

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Embodiment 1

[0038] Such as figure 1 As shown, the present invention provides a kind of chemical chain reaction driven by high nitrogen content biomass to prepare H 2 and NH 3 method, including the following steps:

[0039] Step 1: Pass the biomass with high nitrogen content into the pyrolysis reactor 3, and perform pyrolysis at 600-900°C to produce components of CO, CO 2 , H 2 , N 2 The pyrolysis gas and the biochar whose component is C.

[0040] Step 2: The pyrolysis gas obtained in step 1 is transported into the first reduction reactor 5, and the metal oxygen carrier is reduced to a simple metal or a low-valent metal oxide at 600-1000 ° C to obtain CO 2 , H 2 O and N 2 mixed gas; if the metal oxygen carrier is Fe 2 o 3 , the reaction occurs: CO+Fe 2 o 3 →Fe+CO 2 , H 2 +Fe 2 o 3 →Fe+H 2 O, CO + Fe 2 o 3 →FeO+CO 2 , H 2 +Fe 2 o 3 →FeO+H 2 O.

[0041] Step 3: Pass the metal element or low-valent metal oxide obtained in step 2 into the hydrolysis reactor 6, and mix i...

Embodiment 2

[0047] Such as figure 2 As shown, a chemical chain reaction driven by high nitrogen content biomass to produce biochar and NH 3 method, including the following steps:

[0048] Step 1: Pass the biomass with high nitrogen content into the pyrolysis reactor 3, and perform pyrolysis at 600-900°C to produce components of CO, CO 2 , H 2 , N 2 The pyrolysis gas and the biochar whose component is C.

[0049] Step 2: The pyrolysis gas obtained in step 1 is transported into the first reduction reactor 5, and the metal oxygen carrier is reduced to a simple metal or a low-valent metal oxide at 600-1000 ° C to obtain CO 2 , H 2 O and N 2 mixed gas; if the metal oxygen carrier is Fe 2 o 3 , the reaction occurs: CO+Fe 2 o 3 →Fe+CO 2 , H 2 +Fe 2 o 3 →Fe+H 2 O, CO + Fe 2 o 3 →FeO+CO 2 , H 2 +Fe 2 o 3 →FeO+H 2 O.

[0050] Step 3: Pass the metal element or low-valent metal oxide obtained in step 2 into the hydrolysis reactor 6, and mix it with the incoming H 2 O reacts t...

Embodiment 1 and 2

[0056] Biomass with high nitrogen content is one of algae and municipal sludge or a mixture of both.

[0057] Biomass, as a kind of renewable green and clean energy, has received extensive attention from the international community and is an important chemical raw material. However, some special biomasses have high nitrogen content, such as nitrogen-containing algae and municipal sludge, which provide a new direction for the source of nitrogen in the process of ammonia synthesis. As a kind of aquatic biomass, algae has the advantages of fast growth, short cycle, high yield per unit area, strong environmental adaptability, and does not occupy arable land. It has the potential to become a high-quality chemical raw material. The elemental analysis results of some algae show that the nitrogen content can reach about 10%, which makes it a good choice to use algae as a nitrogen source to synthesize ammonia. As a common waste, municipal sludge will not only consume manpower and mate...

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Abstract

The invention belongs to the field of biomass energy utilization, and particularly discloses a high-nitrogen-content biomass-driven chemical chain reaction system and method, which comprises a process for preparing H2 and NH3 through high-nitrogen-content biomass-driven chemical chain reaction and a process for preparing biochar and NH3 through high-nitrogen-content biomass-driven chemical chain reaction. The high-nitrogen-content biomass is quickly pyrolyzed through the pyrolysis reactor to obtain biological coke and pyrolysis gas. The pyrolysis gas and a metal oxygen carrier produce hydrogen through a first reduction reactor and a hydrolysis reactor, and N2 in the pyrolysis gas is separated out. N2 from the high-nitrogen-content biomass reacts with H2O or H2 in an ammonia synthesis reactor through a nitrogen carrier or a hydrogen carrier packaged by a molecular sieve to produce NH3. Carbon dioxide generated in the process can be used for culturing nitrogen-containing algae after being recycled, so that the whole ammonia synthesis process has the characteristic of carbon negativity. And internal energy coupling of the system is carried out, energy recovery and gradient utilization are realized, and energy consumption in the synthesis ammonia process is further reduced.

Description

technical field [0001] The invention belongs to the field of biomass energy utilization, and in particular relates to a chemical chain reaction system and method driven by biomass with high nitrogen content. Background technique [0002] Ammonia is a very important part of chemical products. Not only many high value-added chemical products or materials require ammonia as a raw material or the participation of ammonia, ammonia is also an important part of chemical fertilizer synthesis, which is the basis of modern agriculture and plays an important role in human development. significance. It has also received much attention as a promising hydrogen storage material in recent years due to its high energy density and carbon-free nature upon liquefaction. [0003] The ammonia synthesis method used in modern industrial production is the Haber-Bosch (H-B) process, that is, under the conditions of high temperature (350-550°C) and high pressure (10-30MPa), N 2 and H 2 Ammonia is s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B3/08C01B3/06C10B53/02C01C1/02C01C1/04C01B32/50C01B21/072
CPCY02E50/10Y02E60/36Y02P20/50
Inventor 吴志强伍松杨伯伦张榕江李运昌刘格
Owner XI AN JIAOTONG UNIV
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