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Nanoparticle surface modified active semi-coke compound desulfurization denitrification agent and preparation method thereof

A technology for desulfurization, denitrification, and active semi-coke, which is applied in the coal chemical industry, can solve the problems of high operating cost, short service life, and no recovery economic value of desulfurized gypsum, and achieves simple comprehensive utilization, less desulfurization agent consumption, and good market prospects. Effect

Active Publication Date: 2010-01-20
PEKING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Wet desulfurization technology has the advantages of mature technology and high desulfurization efficiency. However, the treatment of desulfurized wastewater has problems such as huge equipment, high energy consumption, and high cost.
At present, my country mainly adopts wet desulfurization technology, among which lime / gypsum method is mainly used. Although the desulfurization efficiency is high and the technology is mature, there are a lot of problems: first, a large amount of CO needs to be discharged when preparing CaO 2 , the product of its desulfurization agent is gypsum. Due to its loose texture, desulfurization gypsum has no economic value for recycling and is discarded. The waste desulfurization gypsum stacked and stored occupies a large amount of land, and at the same time it is easy to release toxic substances, causing secondary pollution; China is a country with a large sulfur deficiency, and the sulfur in the flue gas is wasted with the formation of gypsum
However, these desulfurizers have their own advantages and disadvantages, such as short service life and high operating costs (activated carbon containing iodine or nitrogen), expensive (activated carbon fiber), or low desulfurization efficiency, etc.

Method used

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  • Nanoparticle surface modified active semi-coke compound desulfurization denitrification agent and preparation method thereof
  • Nanoparticle surface modified active semi-coke compound desulfurization denitrification agent and preparation method thereof
  • Nanoparticle surface modified active semi-coke compound desulfurization denitrification agent and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Example 1 Preparation of CeO by dipping composite method 2 Nanoparticle-modified active semi-coke composite desulfurization and denitrification agent.

[0031] use figure 1 In the process shown, CeO is compounded on the surface of the active semi-coke using the dipping compound method. 2Nanoparticles.

[0032] The activated semi-coke produced by the steam activation method is a carbon-based material for desulfurization agent (purchased from Yankuang Group), and the activated semi-coke particles with a diameter of 5-15mm are selected and dried under an argon atmosphere at 150 ° C for 60 minutes to remove ash.

[0033] At the same time, CeO with a concentration of 0.4 mol / L was prepared by the sol-gel method 2 Nano sol precursor solution, wherein the dispersant is polyethylene glycol, and the pH is controlled between 4-5.

[0034] Immerse the purified activated semi-coke in CeO 2 Nanosol precursor solution for 360min.. After leaching, it was dried in a drying oven a...

Embodiment 2

[0043] Example 2 Preparation of Fe by hydrothermal growth method 2 O 3 and MnO 2 Activated semi-coke composite desulfurization and denitration agent modified on the surface of composite nanoparticles.

[0044] according to figure 2 The shown process, using the hydrothermal growth method to modify Fe on the surface of the active semi-char 2 O 3 and MnO 2 composite nanoparticles.

[0045] Purchase the active semi-coke particles produced by the water vapor activation method with a diameter of 5-15mm, and then immerse the active semi-coke in the MnSO containing the volume ratio of the active semi-coke and the nano-sol precursor liquid at a ratio of 1:3. 4 , KMnO 4 and FeCl 3 In the hydrothermal kettle of the mixed solution, the concentrations of the three are respectively: 0.006mol / L, 0.004mol / L, 0.005mol / L, and polyethylene glycol is used as a dispersant. The pH of the solution was adjusted to 8, the growth temperature was controlled to 140 °C, and the temperature was m...

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Abstract

The invention provides a nanoparticle surface modified active semi-coke compound desulfurization denitrification agent, which is compounded by active semi-coke and nanoparticle. The invention improves desulfurization efficiency by the high specific surface area, the catalysis characteristic and the oxidizzation characteristic of nano materials, and can catalytically oxidize nitric oxide in smoke, thereby achieving the aim of denitrification.

Description

technical field [0001] The invention belongs to the technical field of coal chemical industry, and in particular relates to a nanoparticle surface modified active semi-coke composite desulfurization and denitration agent and a preparation process thereof. Background technique [0002] At home and abroad, many methods have been developed for the treatment of sulfur pollution from coal combustion. According to the process, there are three types: dry method, semi-dry method and wet method. [0003] Wet desulfurizer is currently the world's most controlled SO 2 The main desulfurization methods for pollution and acid rain prevention and control mainly include: lime / gypsum method, ammonia water method, sodium sulfite recycling method, magnesium oxide-magnesium sulfite method, seawater method, etc. Wet desulfurization technology has the advantages of mature technology and high desulfurization efficiency. However, the treatment of wastewater after desulfurization has problems such ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/86B01D53/60B01J23/889B01J23/10B01J23/34B01J23/745B01J37/02B01J20/20B01J20/32
Inventor 王习东烟征张作泰刘丽丽
Owner PEKING UNIV
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