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Absorbent and method for removing hydrogen sulfide in biogas

An absorbent and hydrogen sulfide technology, applied in chemical instruments and methods, separation methods, gas treatment, etc., can solve problems such as inapplicability and excessive energy consumption

Active Publication Date: 2021-09-21
BEIJING YINGHERUI ENVIRONMENTAL ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The temperature and pressure of the biogas are not high. If the above process is used, the biogas needs to be boosted, resulting in excessive energy consumption. Therefore, this process is not applicable in the field of biogas removal of hydrogen sulfide

Method used

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  • Absorbent and method for removing hydrogen sulfide in biogas
  • Absorbent and method for removing hydrogen sulfide in biogas
  • Absorbent and method for removing hydrogen sulfide in biogas

Examples

Experimental program
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Effect test

Embodiment 1

[0042] The configuration of embodiment 1 absorbent and the absorption performance of hydrogen sulfide

[0043] In a 5L reactor, add demineralized water, ferrous sulfate heptahydrate, polyferric sulfate, complex ligands, N,N-dihydroxyalkylpiperazine, sodium carbonate and sodium bicarbonate buffer system, non-ionic surface Active agents, ionic surfactants, antioxidants. Stir for 15 to 20 minutes to obtain a clear and transparent absorbent, which is used for the determination of the absorption performance. The measurement of the absorption performance is through the gas-liquid contact between the simulated biogas and the absorbent. The configuration conditions and measurement results are shown in the table below, and the hydrogen sulfide removal efficiency is the detection result after 24 hours of operation. Wherein, no dihydroxyethyl alkyl diamine diacetic acid was added in sample 10, the mole fraction of dihydroxy ethyl alkyl diamine diacetic acid in the complex ligands in sam...

Embodiment 2

[0046] Example 2 Biogas Removal of Hydrogen Sulfide Demonstration Project

[0047] Biogas flow rate 2000m 3 / h, the biogas temperature is 35°C, the biogas pressure is 2kPag, the gas distributor enters the spray tower with a tower diameter of 1.4m and a height of 11.5m from the bottom, which contains three spray layers, and sprays from the upper spray layer The poor absorbent liquid under the bottom contact with countercurrent, the contacted absorbent forms a rich liquid, which collects at the bottom of the absorption tower, and flows to the settling regeneration tank by gravity, and the hydrogen sulfide in the biogas after spraying and washing is removed, and the hydrogen sulfide is removed from the top of the tower. The tubing leaves the purification system. The hydrogen sulfide absorbed in the rich liquid is oxidized by ferric iron to form elemental sulfur, and ferric iron is reduced to ferrous iron. After the rich liquid enters the settling regeneration tank, the elementa...

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Abstract

The invention provides an absorbent for removing hydrogen sulfide in biogas. The absorbent is an aqueous solution, and the solute includes complexed iron and complexed ferrous iron, N,N-dihydroxyalkylpiperazine, sodium carbonate and bicarbonate Sodium buffer system, non-ionic surfactant, ionic surfactant and antioxidant; wherein, the concentration of iron element is 100-2000mg / L, and the molar ratio of complexed iron to complexed ferrous is 0.2-5. The buffer system of sodium carbonate and sodium bicarbonate controls the pH of the solution at 6.0-9.0, the concentration of non-ionic surfactant is 50-500mg / L, the concentration of ionic surfactant is 10-100mg / L, N,N-two The concentration of hydroxyethylpiperazine is 10-100 mg / L, and the concentration of antioxidant is 50-500 mg / L. The invention also provides a method for removing hydrogen sulfide by using the absorbent.

Description

technical field [0001] The invention relates to the technical field of gas purification, in particular to an absorbent and a method for removing hydrogen sulfide in biogas. Background technique [0002] Biogas is a mixed gas produced by microbial fermentation of organic substances such as crop straw, livestock and poultry manure, and kitchen waste under anaerobic conditions. The main components of biogas are methane and carbon dioxide, and also contain a small amount of nitrogen and oxygen. , hydrogen and hydrogen sulfide and other components. The use of biogas is mainly for power generation and purification of natural gas. As a renewable energy source, it has become an important part of my country's energy strategy. Hydrogen sulfide is corrosive and will be converted into sulfur dioxide during combustion and utilization. When discharged into the atmosphere, it will form acid gas pollution and seriously affect the environment. Therefore, before biogas power generation or p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/52B01D53/78B01D53/96
CPCB01D53/52B01D53/78B01D53/96B01D2258/05
Inventor 梅雪郑毅孟庆国李旭源
Owner BEIJING YINGHERUI ENVIRONMENTAL ENG