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| Technical Monograph |
Tangshan Kewei Industrial Control Technology Co.,Ltd. |
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| Dry gas desulfurization |
| Author：admin Date：2015-05-12
Views：561 |
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Powdered ferric oxide sorbent
With a larger hole segment structure, flow capacity adsorption performance and good regeneration ability, high desulfurization efficiency, compared with other ways to save about 50% of funds is coking plant and gas plant the ideal desulfurization boutique.
The active constituents of powdered iron oxide are: Fe (OH) 3 - XH2O
Product index
Color
Brown red
Sulfur capacity
100%
Water
30%
Heap density
0.5-0.6/L
A review of continuous process regeneration of Biogas Dry Process
Urban sewage treatment plant sludge by anaerobic digestion produces large amounts of methane, the main component is CH4 and CO2, also contains trace amounts of H2S gas, H2S solution hydrogen sulfate in water vapor will for gas transmission pipeline, gas storage and gas equipment and cause serious corrosion. Therefore, biogas produced by anaerobic digestion of sludge in the storage and use of before must after the desulfurization treatment, Zibo City sewage treatment using dry desulfurization continuous regeneration process for the removal of H2S in the biogas, the device has the advantages of simple structure, simple operation, H2S removal rate is high, low operating cost advantages below of Biogas Dry Desulfurization continuous regeneration process are introduced: ribution
The principle of the continuous process of the dry gas desulfurization of the biogas:
Dry desulfurization is in cylindrical desulfurization tower filling a high degree of desulfurization agent, biogas from the top to the bottom through the desulfurization agent, H2S removal, desulfurization process, sewage treatment plant desulfurization agent for iron oxide, the granular is cylindrical, the principle of iron oxide desulfurization are as follows:
Fe2O3 - H2O+3H2S=Fe2S3 - H2O+3H2O "
By the above reaction equation, we can see that Fe2O3 absorption of H2S into was fe2s3 found to be, with biogas continue to produce, iron oxide absorption of H2S, when absorption H2S reaches a certain amount, the H2S removal rate will be greatly reduced until failure.
Fe2S3 is a reduction of regeneration, and H2O and O2 chemical reactions can be reduced to Fe2O3, the principle is as follows:
The
2Fe2O3 H2O+3O2 = 2Fe2O3 H2O+6S *
Synthesis of the above 2 two reaction, methane desulfurization reaction as follows:
The
H2S+1/2O2 = S+H2O (the reaction condition is Fe2O3, H2O)
By the above equation of chemical reaction can be seen, Fe2O3 absorption of H2S into was fe2s3 found to be was fe2s3 found to be to restore Fe2O3, O2 and H2O, the air compressor before the desulfurization tower to biogas CIC and air can meet the desulfurization agent which the O2 requirement from biogas digesters contain full and water can be fully meet the desulfurization agent of water reduction.
The
Therefore, in the methane into the desulfurization tower by desulfurization agent, while adding to the air, desulfurization agent absorbs H2S failure, O2 and methane in air saturated water will failure of desulfurizer by reduction and Fe2O3 is formed, the process is the continuous regeneration technology of dry desulfurization of biogas.
In
Two. Determination of continuous regeneration air dosage of dry gas desulfurization by dry gas desulfurization:
By reactive H2S+1/2O2 = S+H2O (reaction conditions is Fe2O3 - H2O) and knowable, 1 volume of H2S reacted completely off, to consume 0.5 volume of O 2. According to test of desulfurization, desulfurization agent absorption efficiency of oxygen 50-67%, if calculated by the absorption rate of 60%, then removing 1 volume of H2S need 0.83 volume (that is, the air volume 4) O2, thereby determining continuous desulfurization regeneration air craft investment plus the amount of the calculation procedure is complicated, poor operation, and it is difficult to realize automatic control. Zibo municipal sewage treatment company to introduce the German dry FGD equipment, the air dosing chart given in the manual is as follows (chart 1):
The
From the chart, we can see that the air and quantity and biogas H2S concentration and gas flow, biogas H2S concentration higher, methane flux is high, air dosage is bigger, whereas smaller air cast addition by the automatic control system of automatic quantitative dosing. In
Three, realize the air automatic dosing way: "
According to the above analysis, we can see that in order to realize the continuous regeneration of desulfurizing agent, the key is to according to the gas flow and H 2S concentration, how to realize the adding air to the biogas automatic quantitative, Zibo City sewage treatment German company to introduce dry desulfurization device, continuous regeneration automatic control system principle diagram below (Figure 2): the
From the principle chart shows, biogas flow by the installation of gas pipes in the orifice plate flow meter to detect automatically, and output 4-20mA analog, H2S content in the biogas by the laboratory periodically (general each week a) detection, unchanged in the digester operating parameters, biogas H2S content changes little. According to the manual control valve to regulate the opening of V1 H2S concentration in biogas (according to the concentration of H2S detected in the laboratory adjusted weekly), an orifice plate flowmeter output 4-20mA analog opening through the isolation amplifier automatic regulating electromagnetic proportional valve V3, the amount of air can be controlled by adding to biogas, float the flow meter is installed on the air pipe display of air flow, and according to the opening of the biogas instantaneous flow and a calibration curve of V1 manual control valve, when simulating the amount of methane flow reached a certain flow orifice plate flowmeter output is greater than 4mA, the electric magnetic valve V2 is opened, otherwise the solenoid valve V2 open, in order to prevent in the case of very small gas flow to the biogas adding excess air. Through the above automatic control system, through the above automatic control system, realize the automatic adding of air, so as to realize the continuous regeneration of the agent.. In
Four, dry desulfurization continuous attention to continuous regeneration:
1 in order to prevent the excessive air from the methane investment, should be regularly through the laboratory desulfurization tower of O2 concentration of methane, oxygen content should be controlled at 1%. The
2. Not only to regularly used in desulfurization of biogas H2S content, also used in desulfurization of H2S content, but also used in desulfurization of H2S content, when the desulfurization efficiency is lower than 90%, indicating that desulfurizer is nearing saturation sulfur capacity of sorbent |
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