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Composite adsorbent for biogas desulfurization and decarburization as well as preparation method and application of the composite adsorbent

A biogas desulfurization and composite technology, which is applied in chemical instruments and methods, gas fuels, and other chemical processes, can solve the problems of natural gas purification reaching the pipeline transmission standard, adding traditional treatment technologies, and poor membrane performance stability, etc., to achieve extended Lifespan, full use of resources, and reduced reunion effects

Inactive Publication Date: 2020-08-25
CHINA HUANENG GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The main reason is that the complex membrane making process makes the production cost high, and the performance stability of the membrane is poor due to the limitation of the current industrial production level.
At present, membrane separation technology cannot guarantee that the purification degree of natural gas can reach the pipeline transmission standard under any circumstances, so it is necessary to add traditional treatment technology as the final purification step

Method used

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  • Composite adsorbent for biogas desulfurization and decarburization as well as preparation method and application of the composite adsorbent
  • Composite adsorbent for biogas desulfurization and decarburization as well as preparation method and application of the composite adsorbent
  • Composite adsorbent for biogas desulfurization and decarburization as well as preparation method and application of the composite adsorbent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The simulated biogas containing 40% carbon dioxide volume fraction, 3% hydrogen sulfide volume fraction, and the rest is methane is used for desulfurization and decarbonization reaction. Fly ash, calcium carbide slag, steel slag and waste cement with particle diameters ranging from 90 to 300 microns are selected. Irregular particles are used as the carrier of the composite adsorbent, iron oxide is selected as the auxiliary agent, and the mass ratio of iron oxide to the solid waste carrier of different types of alkaline oxides is 15:100. The iron oxide is dissolved in nitric acid to prepare a ferric nitrate solution , Then mix the ferric nitrate solution into a 10wt% salt solution, place the salt solution and the carrier in a closed device, with a valve between the two to control the flow rate of the salt solution; use a vacuum pump to reduce the pressure of the salt solution and carrier mixed system to 2kPa , Keep for 5h for negative pressure degassing. Open the valve un...

Embodiment 2

[0040] Fly ash is used as a composite adsorbent carrier, and potassium oxide, sodium oxide, iron oxide, calcium oxide, copper oxide, zinc oxide, and cerium oxide are respectively used as auxiliary components. Other conditions are the same as in Example 1. From the experimental results in Table 2, it can be seen that iron oxide and cerium oxide have the best effect. The removal rate of carbon dioxide is 88% and hydrogen sulfide is 89%. This is because potassium oxide and sodium oxide are more alkaline. , The removal rate of carbon dioxide is high, but the desulfurization activity is low; iron oxide and cerium oxide are moderately alkaline, and the desulfurization activity is high. Considering the cost of catalyst preparation, iron oxide is preferred.

[0041] Table 2 Desulfurization and decarbonization effects of composite adsorbents with different oxide additives

[0042]

Embodiment 3

[0044] Fly ash is used as the carrier of the composite adsorbent, iron oxide is used as the auxiliary agent, and the mass ratio of the auxiliary agent to the carrier is (1 to 5): 20 for preparation. Other conditions are the same as in Example 1. From the experimental results in Table 4, it can be seen that the composite adsorbent prepared when the mass ratio of auxiliary agent to carrier is 3:20 has the best effect. The carbon dioxide removal rate is 88%, and the hydrogen sulfide is 89%. In the system, the carrier mainly plays the role of removing carbon dioxide, and the auxiliary agent mainly plays the role of removing hydrogen sulfide. The desulfurization and decarbonization reaction can achieve high efficiency under the condition of the relatively moderate mass ratio of the auxiliary agent to the carrier.

[0045] Table 3 Desulfurization and decarbonization effects of composite adsorbents prepared by mass ratios of different additives and carriers

[0046] The mass ratio of...

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Abstract

The invention discloses a composite adsorbent for biogas desulfurization and decarburization as well as a preparation method and application of the composite adsorbent, and belongs to the technical field of biogas impurity removal and purification. A metal oxide additive is loaded in the multi-layered pore structure of an alkaline oxide solid waste carrier subjected to negative pressure degassing,and metal oxide and alkaline oxide solid waste can synergistically play the roles of desulfurization and decarburization, so that the removal rate of CO2 and H2S can be effectively improved, and theconcentration of a prepared biomass natural gas product is improved. With the composite adsorbent as well as the preparation method and the application of the composite adsorbent adopted, the utilization rate of the basic oxide solid waste can be improved; the activity and capacity of the composite desulfurization and decarburization adsorbent can be improved; the service life of the composite desulfurization and decarburization adsorbent can be prolonged; the reaction rate can be accelerated; carbon dioxide and hydrogen sulfide in biogas can be simultaneously removed; and an efficient and low-cost biogas purification technology is provided.

Description

Technical field [0001] The invention belongs to the technical field of biogas impurity removal and purification, and specifically relates to a composite adsorbent for biogas desulfurization and decarbonization, and a preparation method and application thereof. Background technique [0002] Biogas is a combustible mixed gas produced by the fermentation of microorganisms under anaerobic conditions. Its main components are methane and carbon dioxide. In addition, there are a small amount of hydrogen, nitrogen, carbon monoxide, hydrogen sulfide and ammonia. The volume content of carbon dioxide At 25%-40%. The concentration of hydrogen sulfide in biogas is affected by fermentation raw materials or fermentation processes, and its content varies greatly, generally 1%-3%. This value has exceeded the national standard. Therefore, before using biogas, you must first Removal and purification treatment. The purification and purification of biogas can not only realize energy recovery and re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/08B01J20/30C10L3/10
CPCB01J20/041B01J20/06B01J20/08C10L3/103C10L3/104
Inventor 刘蓉王晓龙肖天存刘练波郜时旺
Owner CHINA HUANENG GRP CO LTD
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