Title:
METHOD FOR REGENERATING THALLIUM POISONING SCR DENITRATION CATALYST OF CEMENT KILN
Document Type and Number:
WIPO Patent Application WO/2022/007450
Kind Code:
A1
Abstract:
Disclosed is a method for regenerating a thallium poisoning SCR denitration catalyst of a cement kiln, comprising the following steps: (1) dust removal; (2) soaking by using a cleaning liquid; (3) rinsing; (4) drying; (5) titanium vanadium tungsten soluble active substance implantation; and (6) calcination, wherein the cleaning liquid in step (2) comprises EDTA, dilute sulfuric acid and water. In the method for regenerating the thallium poisoning SCR denitration catalyst of the cement kiln of the present invention, the cleaning liquid is weakly acidic, which may effectively remove thallium metal that adheres to the surface and pores of the catalyst, and restore the active sites of the catalyst without reducing original active components of the catalyst. The ETDA in the cleaning liquid highly effectively removes the thallium metal. The titanium vanadium tungsten soluble active substance is implanted on the catalyst, which effectively replenishes lost vanadium and tungsten active components, and effectively restores the catalyst activity and low SO2 conversion rate.
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Inventors:
ZHANG TAO (CN)
LIU ANYANG (CN)
DENG LIFENG (CN)
LUO CHUNYUN (CN)
REN YINGJIE (CN)
LIU ANYANG (CN)
DENG LIFENG (CN)
LUO CHUNYUN (CN)
REN YINGJIE (CN)
Application Number:
PCT/CN2021/085754
Publication Date:
January 13, 2022
Filing Date:
April 07, 2021
Export Citation:
Assignee:
JIANGSU LONGKINGCOTECH CO LTD (CN)
International Classes:
B01D53/56; B01D53/86; B01J23/30; B01J35/10; B01J38/00; B01J38/02
Foreign References:
| CN111715210A | 2020-09-29 | |||
| CN102764675A | 2012-11-07 | |||
| CN103736527A | 2014-04-23 | |||
| CN105797789A | 2016-07-27 | |||
| CN105709861A | 2016-06-29 | |||
| CN106807401A | 2017-06-09 | |||
| US20070221250A1 | 2007-09-27 |
Other References:
XU HUANG ET AL.: "Severe deactivation and artificial enrichment of thallium on commercial SCR catalysts installed in cement kiln", APPLIED CATALYSIS B: ENVIRONMENTAL, vol. 277, 31 May 2020 (2020-05-31), XP086222747, ISSN: 0926-3373, DOI: 10.1016/j.apcatb.2020.119194
Attorney, Agent or Firm:
BEIJING CROWN & RIGHTS LAW FIRM (CN)
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