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Method for preparing active carbon based adsorbent for adsorbing SO2 in smoke gas

A technology of base materials and adsorbents, which is applied in the field of preparation of flue gas SO2 adsorbents, can solve the problems of high cost, small semi-coke particle size, limited modification of chemical properties, etc., and achieve high desulfurization performance and low price.

Inactive Publication Date: 2005-01-26
OCEAN UNIV OF CHINA
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Problems solved by technology

[0004] Removal of SO in flue gas by using activated semi-coke and other carbon-containing materials 2 The research on the research has been very active both at home and abroad. Li Wenhua of the Coal Chemical Institute of the General Academy of Coal Research in China, Liu Changjian of the Chemical Metallurgy Institute of the Chinese Academy of Sciences, etc., and Kenichi Gomi and Takeyong Komuro of Hitachi, Japan have done a lot of research work. Some results have been achieved, but they all use traditional activated carbon production methods (water or oxygen activation at high temperature) to modify semi-coke, resulting in limited modification of chemical properties, while large carbon loss (40%), high cost, and the selected The particle size of semi-coke is too small to be directly used in industrial flue gas desulfurization

Method used

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Effect test

Embodiment 1

[0011] The preparation process of the present invention is as follows: bulk density is 0.5~0.7g / ml, specific surface area is 10~200m 2 / g, carbon content 70-85%, hydrogen content 0.5-2.5%, oxygen content 10-30%, nitrogen content 0.3-1.2%, moisture content 2-9%, ash content 3-1 5 %, lignite semi-coke with a volatile content of 6-18% is screened to obtain 4-10 mesh particles, the semi-coke particles and water are mixed at a volume ratio of 1:0.6-1.2 and then put into a high-pressure reactor. , React at 5-100atm for 2-8 hours, take it out after natural cooling, and then dry the semi-coke at 100-150°C for 2 hours, then in the ozone activation device at a temperature of 30-80°C and a space velocity of 500-5000h -1 Activation treatment with ozone for 6 hours, then impregnating KI with equal volume, so that the amount of KI accounts for 2-5% of the total weight of the modified semi-coke, and standing for 24 hours, followed by 4 hours of treatment in a nitrogen atmosphere at 300-500 °...

Embodiment 2～6

[0014] The raw material is 5 parts of the same semi-coke, prepared according to the same method as in Example 1. They are in the ozone activation device at a temperature of 80°C and a space velocity of 500h -1 The activation time with ozone was 0, 0.5, 1, 2, and 3 hours respectively, and the adsorbent was prepared. The activation time and sulfur capacity data are shown in Table 1. The results show that the sulfur capacity is the highest when the activation time is 2 hours.

[0015] Table 1 Sulfur capacity of activated carbon-based material flue gas SO2 adsorbents with different activation times

[0016] Sorbent No. 1 2 3 4 5

[0017] Activation time (h) 0 0.5 1 2 3

[0018] Sulfur capacity (%) 1.64 2.27 2.64 2.77 2.71

Embodiment 7～9

[0020] The raw material is 3 parts of the same semi-coke, prepared according to the same method as in Example 1. They are in the ozone activation device at a temperature of 80°C and 300, 500, 700h -1 The adsorbent was prepared by activating with ozone for 2 hours at three different space velocities. The data of activation space velocity and sulfur capacity are shown in Table 2. The result shows that the activation space velocity is 500h -1 best time.

[0021] Table 2 Sulfur capacity of activated carbon-based material flue gas SO2 adsorbents with different activation space velocities

[0022] Sorbent No. 1 2 3

[0023] Activation space velocity (h-1) 300 500 700

[0024] Sulfur capacity (%) 2.32 2.64 2.39

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Abstract

The invention discloses a manufacturing method for smoke SO2 sorbent with active carbon base. The feature is it uses lignite or anthracite, soft coal semicoke as material, and it is modified with pressing water thermochemical method, being activated by ozone, immersing KI with the same volume, then it is activated in air or N2. The product has an excellent desulphurizing performance, the price is low, and it can be used for industrial smoke desulphurization.

Description

technical field [0001] The invention relates to flue gas SO used in coal-fired power plants, coal-fired boilers and coal-fired kilns and other flue gas desulfurization purification and environmental protection industries. 2 The preparation method of adsorbent, more specifically an activated carbon-based material flue gas SO 2 Sorbent preparation method. Background technique [0002] Coal accounts for about 69% of my country's energy consumption structure. A large amount of coal combustion has caused the country's air to be polluted by soot. Especially since the 1980s, with the rapid development of my country's economy, coal consumption has increased day by day, SO 2 Emissions continue to grow, resulting in serious air pollution. According to statistics, in 1985 my country's SO 2 The emissions were 15.3 million tons, 17.52 million tons in 1990, and increased to 23.7 million tons in 1995. In 2000, SO 2 Emissions are about 25.9 million tons. Since S0 2 A large amount of d...

Claims

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Application Information

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IPC IPC(8): B01D53/02B01J20/20B01J20/30
Inventor 李春虎
Owner OCEAN UNIV OF CHINA
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