CN107866150A - 钒钛磁铁矿烧结烟气催化氧化脱硝的方法 - Google Patents
钒钛磁铁矿烧结烟气催化氧化脱硝的方法 Download PDFInfo
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- CN107866150A CN107866150A CN201711123276.9A CN201711123276A CN107866150A CN 107866150 A CN107866150 A CN 107866150A CN 201711123276 A CN201711123276 A CN 201711123276A CN 107866150 A CN107866150 A CN 107866150A
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- flue gas
- vanadic
- sintering flue
- titanomagnetite
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N carbon monoxide Chemical compound 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[O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 61
- 239000003546 flue gas Substances 0.000 title claims abstract description 55
- 238000005245 sintering Methods 0.000 title claims abstract description 48
- 238000007254 oxidation reaction Methods 0.000 title claims abstract description 28
- 230000003647 oxidation Effects 0.000 title claims abstract description 26
- 230000003197 catalytic Effects 0.000 title claims abstract description 24
- 239000003054 catalyst Substances 0.000 claims abstract description 28
- 238000000605 extraction Methods 0.000 claims abstract description 15
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 15
- 239000002893 slag Substances 0.000 claims abstract description 14
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 14
- 239000010936 titanium Substances 0.000 claims abstract description 14
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 12
- 239000001301 oxygen Substances 0.000 claims abstract description 12
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- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium(0) Chemical compound 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- 150000003839 salts Chemical class 0.000 claims abstract description 7
- 239000011780 sodium chloride Substances 0.000 claims abstract description 7
- 238000006243 chemical reaction Methods 0.000 claims description 8
- 230000000149 penetrating Effects 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 abstract description 5
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- 230000035484 reaction time Effects 0.000 description 6
- 238000000034 method Methods 0.000 description 4
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- 230000000694 effects Effects 0.000 description 3
- 238000007873 sieving Methods 0.000 description 3
- RAHZWNYVWXNFOC-UHFFFAOYSA-N sulphur dioxide Chemical compound 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- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitrogen oxide Substances 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O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 235000019504 cigarettes Nutrition 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive Effects 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N carbon Chemical compound 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[C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000003009 desulfurizing Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- KRHYYFGTRYWZRS-UHFFFAOYSA-M fluoride anion Chemical compound data:image/svg+xml;base64,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 data:image/svg+xml;base64,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 [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 229910052813 nitrogen oxide Inorganic materials 0.000 description 1
- 230000001590 oxidative Effects 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
- B01D53/8628—Processes characterised by a specific catalyst
-
- B—PERFORMING OPERATIONS; TRANSPORTING
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Abstract
本发明属于烟气脱硝技术领域，具体涉及一种钒钛磁铁矿烧结烟气催化氧化脱硝的方法。针对现有的脱硝方法都不适合用于钒钛磁铁矿烧结烟气脱硝，并且脱硝复杂，成本高等问题，本发明提供了一种钒钛磁铁矿烧结烟气催化氧化脱硝的方法，包括以下步骤：向钒钛磁铁矿烧结烟气中喷入催化剂，于140～160℃下反应15～20s。所述的钒钛磁铁矿烧结烟气中氧气含量≥5％，催化剂为烧结烟气除尘灰、提钒尾渣、提钛尾渣、钢渣或熔盐氯化渣中的至少一种。本发明充分利用烧结烟气中残留的氧气，加入适宜的催化剂进行脱硝，脱硝效率高，脱硝成本低，适宜推广使用。
Description
钒钛磁铁矿烧结烟气催化氧化脱硝的方法
技术领域
[0001]本发明属于烟气脱硝技术领域，具体涉及一种钒钛磁铁矿烧结烟气催化还原脱硝 的方法。
背景技术
[0002]近年来，我国许多地区特别是京津冀地区频发大范围的雾霾重污染事件。为改善 区域空气质量，国家相继出台了一系列环保政策，特别是针对钢铁行业出台了更加严格的 总量控制与浓度控制的政策及标准，在新颁布的排放标准在粉尘、二氧化硫的基础上，增加 了氮氧化物、二噁英及氟化物等。随着环保要求的提高和更加严格的排放标准的出台，钢铁 行业正面临着加强控制N0X排放的挑战。
[0003] 在烟气脱硝方面，目前工业应用较多的选择性催化还原脱硝技术(SCR)及选择性 非催化还原脱硝技术(SNCR)。上述方法因所需的反应温度较高(300°C〜1000°C)不适合钒 钛磁铁矿烧结烟气(烟气温度150°C〜16(TC)的脱硝处理。活性炭吸附法由于投资及运行费 用较高也不适于烧结烟气的脱硝处理。湿法烟气脱硝目前多数处于试验研宄阶段，技术成 熟度不高，同时存在投资及运行费用高的问题，也不适于烧结烟气的脱硝处理。
发明内容
[0004] 本发明要解决的技术问题为:现有的脱硝方法都不适合用于钒钛磁铁矿烧结烟气 脱硝，并且脱硝复杂，成本高的问题。
[0005] 本发明解决上述技术问题的技术方案为:提供一种钒钛磁铁矿烧结烟气催化氧化 脱硝的方法。该方法包括以下步骤：
[0006] 向钒钛磁铁矿烧结烟气中喷入催化剂，于140〜160°C下反应15〜20s。
[0007] 其中，上述钒鈦磁铁矿烧结烟气催化氧化脱硝的方法中，所述的钒钛磁铁矿烧结 烟气中氧气含量的体积分数>5%。
[0008] 其中，上述钒钛磁铁矿烧结烟气催化氧化脱硝的方法中，所述的催化剂为烧结烟 气除尘灰、提钒尾渣、提钛尾渣、钢渣或熔盐氯化渣中的至少一种。
[0009] 其中，上述钒钛磁铁矿烧结烟气催化氧化脱硝的方法中，所述催化剂粒度为:400 目筛下物彡80%。
[0010]其中，上述钒钛磁铁矿烧结烟气催化氧化脱硝的方法中，所述的催化剂组成包括： 按重量百分比计，Fe含量20〜25%，Ti含量10%〜15%，V含量0_5〜1.0%，Mn含量0.3〜 0.5%〇
[0011] 其中，上述钒钛磁铁矿烧结烟气催化氧化脱硝的方法中，所述喷入的催化剂质量 与烟气量的比值为〇. 02〜〇. 〇5g/Nm3。
[0012] 其中，上述钒钛磁铁矿烧结烟气催化氧化脱硝的方法中，所述反应温度为l5〇°C。
[0013] 本发明的有益效果为：
[0014] 本发明充分利用钒钛磁铁矿烧结烟气中残留的氧气，通过加入催化剂对N0X进行 氧化，使其转化为N〇2、N2〇3、N2〇4等易于吸收的气体，并在后续的脱硫装置中与S〇2—起被脱 除，从而完成钒钛磁铁矿烧结烟气的脱硝处理。本发明选用烧结烟气除尘灰、提钒尾渣、提 钛尾渣、钢渣或熔盐氯化渣等副产物为催化剂，节约脱硝成本，也能达到较高的脱硝效率。 本发明方法操作简单，易于实施，适合工业化应用，值得推广。
具体实施方式
[0015] 本发明提供了一种钒钛磁铁矿烧结烟气催化氧化脱硝的方法，包括以下步骤：
[0016] 向钒钛磁铁矿烧结烟气中喷入催化剂，于140〜160°C下反应I5〜20s。
[0017] 其中，上述钒钛磁铁矿烧结烟气催化氧化脱硝的方法中，所述的钒钛磁铁矿烧结 烟气中氧气含量多5%。优选的氧气含量为多15%，氧气含量越充足，脱硝效率越高，本发明 钒钛磁铁矿烧结烟气中本身即含有15〜16%的氧气，充分利用残留氧气，可以不喷入氧气， 简化操作，节约成本。
[0018]其中，上述钒钛磁铁矿烧结烟气催化氧化脱硝的方法中，所述的催化剂为烧结烟 气除尘灰、提钒尾渣、提钛尾渣、钢渣或熔盐氯化渣中的至少一种。本发明所用的烧结烟气 除尘灰、提钒尾渣、提钛尾渣、钢渣和熔盐氯化渣都是炼钢产业常见的副产物，利用这些副 产物，进一步的降低成本。
[0019] 其中，上述钒钛磁铁矿烧结烟气催化氧化脱硝的方法中，所述催化剂粒度为:400 目筛下物彡80 %。
[0020] 其中，上述钒钛磁铁矿烧结烟气催化氧化脱硝的方法中，所述的催化剂组成包括： 按重量百分比计，Fe含量20〜25%，Ti含量10%〜15%，v含量0_5〜l_0%，Mn含量0.3〜 0_5%。
[0021]其中，上述钒钛磁铁矿烧结烟气催化氧化脱硝的方法中，所述喷入的催化剂质量 与烟气量的比值为0.02〜0.05g/Nm3。
[0022]下面将结合实施例对本发明的具体实施方式做进一步的解释说明，但不表示将本 发明的保护范围限制在实施例所述范围内。
[0023] 实施例1用本发明方法进行烟气脱硝处理
[0024]将除尘灰、提钒尾渣按1:2的比例混合，调质后控制粒度4〇〇目的过筛率为85%、Fe 的含量为20%、Ti含量为10%、V含量为1 %、Mn含量为0• 5%，烟气与催化剂的反应温度为 14(TC，反应时间为15S，喷入的催化剂质量与烟气量的比值为〇_〇2g/Nm3时，NOx的氧化脱除 效率为40〜45 %。
[0025] 实施例2用本发明方法进行烟气脱硝处理
[0026]将提钛尾渣、钢渣、熔盐氯化渣按4:1:1的比例混合，调质后控制粒度4〇〇目的过筛 率为90%、Fe的含量为23%、Ti含量为12%、V含量为〇.8%、Mn含量为〇_4%，烟气与催化剂 的反应温度为16(TC，反应时间为20S，喷入的催化剂质量与烟气量的比值为〇.〇4g/Nm3时， NOx的氧化脱除效率为60〜65 %。
[0027]实施例3用本发明方法进行烟气脱硝处理 味
[0028]将除尘灰、提钒尾渣、提钛尾渣按1:2:2的比例混合，调质后控制粒度4〇〇目的过筛 率为9〇%、Fe的含量为25%、Ti含量为15%、V含量为1 %、Mn含量为〇 • 5%，烟气与催化剂的 反应温度为15(TC，反应时间为20S，喷入的催化剂质量与烟气量的比值为0.〇5g/Nm3时，NOx 的氧化脱除效率为80〜85 %。 ~
[0029]由实施例可知:本发明中的反应时间、反应温度、催化剂加入量都与N〇x的催化氧 化脱除效率息息相关，当反应温度为最佳温度15(TC，或延长反应时间，或增大催化剂添加 量时，都可以使N〇x的催化氧化脱除效率升高。因此，本发明方法适用于各种环保排放标准 的烟气脱硝，使用时可根据实际需要选择适宜的反应时间、温度和添加剂使用量。
Claims (7)
1.钒钛磁铁矿烧结烟气催化氧化脱硝的方法，其特征在于，包括以下步骤： 向钒钛磁铁矿烧结烟气中喷入催化剂，于140〜160 °C下反应15〜20s。
2. 根据权利要求1所述的钒钛磁铁矿烧结烟气催化氧化脱硝的方法，其特征在于:所述 的钒钛磁铁矿烧结烟气中氧气的体积分数> 5 %。
3. 根据权利要求1所述的钒钛磁铁矿烧结烟气催化氧化脱硝的方法，其特征在于:所述 的催化剂为烧结烟气除尘灰、提钒尾渣、提钛尾渣、钢渣或熔盐氯化渣中的至少一种。
4. 根据权利要求1所述的钒钛磁铁矿烧结烟气催化氧化脱硝的方法，其特征在于:所述 催化剂粒度为:400目筛下物多8〇 %。
5. 根据权利要求1所述的钒钛磁铁矿烧结烟气催化氧化脱硝的方法，其特征在于:所述 的催化剂组成包括：按重量百分比计，Fe含量20〜25%，Ti含量10%〜15%，V含量0.5〜 1.0%，Mn 含量 0.3 〜〇_5%。
6. 根据权利要求1所述的钒钛磁铁矿烧结烟气催化氧化脱硝的方法，其特征在于:所述 喷入的催化剂质量与烟气量的比值为〇 • 〇2〜0.05g/Nm3。
7. 根据权利要求1所述的钥*钛磁铁矿烧结烟气催化氧化脱硝的方法，其特征在于:所述 反应温度为150°C。
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