SNAR： 一种新型非氨基还原除酸脱硝工艺技术

doi:10.16085/j.issn.1000-6613.2022-0239

摘要/Abstract

摘要：

为了解决当前脱硝技术存在的氨逃逸及安全隐患等问题，本文采用了一种新型选择性非氨基还原除酸脱硝工艺技术（SNAR）。首先，详细地阐述了SNAR工艺的技术原理和流程；然后基于天津石化热电部7^#煤粉炉工业试验，验证了该工艺技术的脱硝效果和是否存在氨逃逸；最后，通过对标分析选择性催化还原（SCR）和选择性非催化还原（SNCR）工艺技术，总结了SNAR工艺技术的优点及应用前景。研究结果表明：SNAR工艺技术的NO _x 脱除率为50%~90%，不会产生氨逃逸。该技术能够有效地避免氨逃逸带来的二次污染，解决腐蚀、结垢及安全等问题，给锅炉运行带来了极大的经济和环境效益。

关键词: 选择性非氨基还原, 选择性催化还原, 脱硝, 氨逃逸, 锅炉运行

Abstract:

In order to solve the problems of ammonia escape and safety hazards in the current denitrification technology, a new selective non-amino reduction(SNAR) acid denitrification process technology was proposed. Firstly, the technical principle and process of the SNAR were explained in detail. Then, based on the industrial test of the 7^# pulverized coal furnace of the Tianjin petrochemical thermal power department, the denitrification effect of the process technology and whether there was ammonia escape were verified. Finally, through the benchmark analysis of SCR and SCNR process technology, the advantages and application prospects of SNAR process technology were summarized. The research results showed that the NO _x removal rate of SNAR process technology was 50%—60%, and no ammonia escape will occur. When combined with SCR technology, the denitrification efficiency can reach 80%—90%, and it can effectively reduce ammonia escapes of SCR technology. SNAR technology can effectively avoid the secondary pollution caused by ammonia escape, solve the problems of corrosion, fouling and safety, and bring great economic and environmental benefits.

Key words: selective non-amino reduction(SNAR), selective catalytic reduction(SCR), denitrification, ammonia escape, boiler operation

中图分类号:

X773

宋玉昆, 王国刚, 张新功, 刘大阔, 张金庆, 林瀚. SNAR：一种新型非氨基还原除酸脱硝工艺技术[J]. 化工进展, 2022, 41(S1): 606-612.

SONG Yukun, WANG Guogang, ZHANG Xingong, LIU Dakuo, ZHANG Jinqing, LIN Han. SNAR: a new non-amino reduction technology for acid and denitration[J]. Chemical Industry and Engineering Progress, 2022, 41(S1): 606-612.

图/表 11

参考文献 13

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采样点	加剂前 /mg·m^-3	加剂后 /mg·m^-3	采样点	加剂前 /mg·m^-3	加剂后 /mg·m^-3
1	368	153	17	339	152
2	373	162	18	303	151
3	347	161	19	308	130
4	356	165	20	326	160
5	364	154	21	345	211
6	370	152	22	339	138
7	348	170	23	312	155
8	365	149	24	286	132
9	278	138	25	184	87
10	398	160	26	287	134
11	331	151	27	262	126
12	342	169	28	281	123
13	374	168	29	323	138
14	285	139	30	282	75
15	342	212	31	306	150
16	341	137	32	256	122

采样点	加剂前 /mg·m^-3	加剂后 /mg·m^-3	采样点	加剂前 /mg·m^-3	加剂后 /mg·m^-3
1	368	153	17	339	152
2	373	162	18	303	151
3	347	161	19	308	130
4	356	165	20	326	160
5	364	154	21	345	211
6	370	152	22	339	138
7	348	170	23	312	155
8	365	149	24	286	132
9	278	138	25	184	87
10	398	160	26	287	134
11	331	151	27	262	126
12	342	169	28	281	123
13	374	168	29	323	138
14	285	139	30	282	75
15	342	212	31	306	150
16	341	137	32	256	122

负荷 /t·h^-1	NO _x 浓度/mg·m^-3					NO _x 脱除率/%
负荷 /t·h^-1	加剂前	加剂0.5h	加剂1h	加剂1.5h	加剂2h	NO _x 脱除率/%
310	335.60	163.20	157.40	142.66	140.01	58.28
360	343.25	170.25	163.50	158.75	150.10	56.10
380	359.50	188.60	176.00	170.40	161.92	54.96

负荷 /t·h^-1	NO _x 浓度/mg·m^-3					NO _x 脱除率/%
负荷 /t·h^-1	加剂前	加剂0.5h	加剂1h	加剂1.5h	加剂2h	NO _x 脱除率/%
310	335.60	163.20	157.40	142.66	140.01	58.28
360	343.25	170.25	163.50	158.75	150.10	56.10
380	359.50	188.60	176.00	170.40	161.92	54.96

加剂频率	还原剂量/kg·h^-1	初始NO _x 浓度/mg·m^-3	加剂后NO _x 浓度/mg·m^-3	NO _x 脱除率/%
30Hz	100	276.2	126.1	54.34
40Hz	140	276.2	120.3	56.44
50Hz	200	276.2	114.6	58.50