CN115231912A - 一种丙烷脱氢反应器衬里用低铁气硬性火泥 - Google Patents
一种丙烷脱氢反应器衬里用低铁气硬性火泥 Download PDFInfo
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- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 title claims abstract description 56
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 33
- 238000006356 dehydrogenation reaction Methods 0.000 title claims abstract description 30
- 239000001294 propane Substances 0.000 title claims abstract description 28
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 22
- 239000000843 powder Substances 0.000 claims abstract description 49
- 235000019353 potassium silicate Nutrition 0.000 claims abstract description 24
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims abstract description 24
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 claims abstract description 22
- 229910052863 mullite Inorganic materials 0.000 claims abstract description 22
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 18
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 18
- 229910021538 borax Inorganic materials 0.000 claims abstract description 16
- 235000010339 sodium tetraborate Nutrition 0.000 claims abstract description 16
- BSVBQGMMJUBVOD-UHFFFAOYSA-N trisodium borate Chemical compound [Na+].[Na+].[Na+].[O-]B([O-])[O-] BSVBQGMMJUBVOD-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000007767 bonding agent Substances 0.000 claims abstract description 4
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- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 2
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- 238000000034 method Methods 0.000 abstract description 10
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- 239000011449 brick Substances 0.000 description 8
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- 238000010276 construction Methods 0.000 description 4
- 238000007580 dry-mixing Methods 0.000 description 4
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 238000002360 preparation method Methods 0.000 description 4
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 description 4
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- 238000005303 weighing Methods 0.000 description 4
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
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- 238000005516 engineering process Methods 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
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- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
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- 238000002485 combustion reaction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000000265 homogenisation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 1
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 1
- 238000006479 redox reaction Methods 0.000 description 1
- 230000001172 regenerating effect Effects 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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Abstract
本发明属于耐火材料技术领域，涉及一种丙烷脱氢反应器衬里用低铁气硬性火泥。涉及的一种丙烷脱氢反应器衬里用低铁气硬性火泥的组成为：低铝莫来石粉、低铝莫来石粉、广西白泥粉、烧结氧化铝粉、外加CMC、外加硼酸钠、外加水玻璃；所述的CMC和硼酸钠作为火泥的增强剂和促凝剂；所述的水玻璃为火泥的结合剂。本发明原料的均一性和稳定性好，吸水率稳定，减少了火泥材料在反应器运行过程中周而复始的氧化气氛‑还原气氛对火泥胶结结构的负面影响。
Description
技术领域
本发明属于耐火材料技术领域，涉及一种用于砌筑耐火砖用的耐火泥浆，具体来讲涉及一种丙烷脱氢反应器衬里用低铁气硬性火泥。
背景技术
美国Lummus公司的丙烷脱氢技术CATOFIN工艺是一种最具有代表性的丙烷脱氢制备丙烯的工艺，近几年来在国内推广的速度快，成为国内丙烷脱氢的主流技术。丙烷脱氢反应器是一个水平卧式的炉子，长度17米左右，直径8米左右。为了满足催化脱氢工艺的要求，反应器下部设计为多个并排的拱，拱与拱之间采用耐火砖搭接，上方放置支撑透气砖，透气砖上放置供催化反应的几百吨催化剂。 拱的结构稳定性是反应器正常运行的关键。
拱的砌筑完成后，火泥必须在很短时间硬化产生强度，以满足拱的支撑作用，防止在砌筑拱上方的衬里材料时，出现下沉现象，影响结构的稳定。同时反应器在运行时，由于丙烷脱氢过程中有脱氢环节的强还原气氛，也有通过空气让催化剂再生的氧化气氛阶段，其对耐火泥中氧化铁的含量也有要求，以防止火泥中的氧化铁的氧化还原反应发生，影响拱结构稳定。
发明内容
本发明的目的是提供一种丙烷脱氢反应器衬里用低铁气硬性火泥，使其能够满足丙烷脱氢反应器衬里的砌筑以及运行过程中对氧化铁的需求。
为了实现上述目的，本发明采取如下技术方案：
一种丙烷脱氢反应器衬里用低铁气硬性火泥，低铁气硬性火泥的组成及质量百分比为：
低铝莫来石粉 0.5～0.088mm 45～55%，
低铝莫来石粉 <0.088mm 15～25%，
广西白泥粉 <0.047mm 10～20%，
烧结氧化铝粉 <0.047mm 10～20%，
外加CMC 0.8～1.5%，
外加硼酸钠 0.15～0.25%，
外加水玻璃 25～35%；
所述的CMC和硼酸钠作为火泥的增强剂和促凝剂；所述的水玻璃为火泥的结合剂；水玻璃的氧化硅和碱金属氧化物的分子比为2.3～2.8，密度为1.2～1.3g/cm3。
所述的低铝莫来石粉，Al2O3的含量47～60%，Fe2O3的含量小于1.2%。
所述的广西白泥粉，Al2O3的含量38%，Fe2O3的含量小于0.5%。
所述的烧结氧化铝粉，Al2O3的含量大于99%，Fe2O3的含量小于0.1%。
本发明提出的一种丙烷脱氢反应器衬里用低铁气硬性火泥，由于采用上述技术方案，具有如下的有益效果：
第一，以低铝莫来石粉为主要原料，低铝莫来石是经过原生矿进行均化烧结，原料的均一性和稳定性好，吸水率稳定，不会引起火泥用水量的忽高忽低；
第二，本方案中所选择的原料，低铝莫来石粉中的Fe2O3含量小于1.2%，广西白泥粉Fe2O3的含量小于0.5%，烧结氧化铝粉Fe2O3的含量小于0.1%，可以保证制备的耐火泥中的Fe2O3含量小于1.0%。较低的含量，能够减少火泥材料在反应器运行过程中周而复始的氧化气氛-还原气氛对火泥胶结结构的负面影响；
第三，水玻璃作为结合剂的火泥，在砌筑完成后，水玻璃吸收空气中的二氧化碳，形成无定形硅酸并逐渐干燥固化。这个固化硬化的速度较慢。本发明中利用CMC吸附在硅酸胶粒的表面上，阻碍后者增大，胶料小，硅酸凝胶单位体积内粘结点增加，强度提高；同时CMC有很强的吸水性，能够使水玻璃在固化过程中快速脱水，硬化速度提快；同时利用硼酸钠作为辅助促凝剂的作用，加快水玻璃的硬化速度，尽快使得火泥产生粘结强度。
第四，利用硼酸钠的促烧作用，可以满足气硬性的火泥在反应器的工作温度（704℃）下也能保持较高的粘结强度，确保反应器拱形结构的安全稳定。
具体实施方式
结合具体实施例对本发明加以详细说明：
实施例1：
一种丙烷脱氢反应器衬里用低铁气硬性火泥，由0.5～0.088mm的低铝莫来石粉（Al2O3的含量47%）45%，<0.088mm的低铝莫来石粉（Al2O3的含量60%）25%，<0.047mm的广西白泥粉15%，<0.047mm的烧结氧化铝粉15%，CMC外加比例0.8%，硼酸钠的外加比例为0.15%。
一种丙烷脱氢反应器衬里用低铁气硬性火泥制备方法为：
1）按照所述的各组分比例，分别称取低铝莫来石粉、广西白泥粉、烧结氧化铝粉，外加添加剂CMC，硼酸钠，在混炼机内进行充分混合，装袋。
2）按照水玻璃的模数为2.3，配制好水玻璃浓度为1.2g/cm3，装桶；
3）现场施工时将火泥干混进行混合2min，加入25%的水玻璃，进行充分混合，制备成火泥浆体，即可用来砌筑耐火砖。
实施例2：
一种丙烷脱氢反应器衬里用低铁气硬性火泥，由0.5～0.088mm的低铝莫来石粉（Al2O3的含量47%）50%，<0.088mm的低铝莫来石粉（Al2O3的含量47%）20%，<0.047mm的广西白泥粉20%，<0.047mm的烧结氧化铝粉10%，CMC外加比例1.0%，硼酸钠的外加比例为0.12%。
一种丙烷脱氢反应器衬里用低铁气硬性火泥制备方法为：
1）按照所述的各组分比例，分别称取低铝莫来石粉、广西白泥粉、烧结氧化铝粉，外加添加剂CMC，硼酸钠，在混炼机内进行充分混合，装袋。
2）水玻璃的模数为2.5，配制好水玻璃浓度为1.25g/cm3，装桶；
3）现场施工时将火泥干混进行混合2min，加入28%的水玻璃，进行充分混合，制备成火泥浆体，即可用来砌筑耐火砖。
实施例3：
一种丙烷脱氢反应器衬里用低铁气硬性火泥，由0.5～0.088mm的低铝莫来石粉（Al2O3的含量60%）55%，<0.088mm的低铝莫来石粉（Al2O3的含量47%）15%，<0.047mm的广西白泥粉10%，<0.047mm的烧结氧化铝粉20%，CMC外加比例1.3%，硼酸钠的外加比例为0.08%。
一种丙烷脱氢反应器衬里用低铁气硬性火泥制备方法为：
1）按照所述的各组分比例，分别称取低铝莫来石粉、广西白泥粉、烧结氧化铝粉，外加添加剂CMC，硼酸钠，在混炼机内进行充分混合，装袋。
2）水玻璃的模数为2.6，配制好水玻璃浓度为1.28g/cm3，装桶；
3）现场施工时将火泥干混进行混合2min，加入32%的水玻璃，进行充分混合，制备成火泥浆体，即可用来砌筑耐火砖。
实施例4：
一种丙烷脱氢反应器衬里用低铁气硬性火泥，由0.5～0.088mm的低铝莫来石粉（Al2O3的含量47%）50%，<0.088mm的低铝莫来石粉（Al2O3的含量47%）15%，<0.047mm的广西白泥粉20%，<0.047mm的烧结氧化铝粉15%，CMC外加比例1.5%，硼酸钠的外加比例为0.05%。
一种丙烷脱氢反应器衬里用低铁气硬性火泥制备方法为：
1）按照所述的各组分比例，分别称取低铝莫来石粉、广西白泥粉、烧结氧化铝粉，外加添加剂CMC，硼酸钠，在混炼机内进行充分混合，装袋。
2）水玻璃的模数为2.8，配制好水玻璃浓度为1.3g/cm3，装桶；
3）现场施工时将火泥干混进行混合2min，加入35%的水玻璃，进行充分混合，制备成火泥浆体，即可用来砌筑耐火砖。
按照上述方法制备的气硬性水泥按照国家标准或行业标准，进行化学成分Al2O3的含量，Fe2O3的含量，室温24h自然放置后的抗折粘结强度，110℃×24h干燥后的抗折粘结强度，704℃×5h热处理后的抗折粘结强度指标进行检测，结果如下表1所示：
表
性能指标表
表1显示，本发明的一种丙烷脱氢反应器衬里用低铁气硬性火泥具有Fe2O3含量低、室温条件下固化快强度高的特点，能够满足丙烷脱氢反应器衬里在砌筑过程中对火泥快速气硬性和较高强度的要求，也满足了运行过程中氧化气氛和还原气氛交替对火泥中低Fe2O3含量的要求。同时在704℃的反应器运行温度进行处理后的火泥抗折粘结强度依然很高，确保反应器运行中结构安全稳定。
Claims (4)
1.一种丙烷脱氢反应器衬里用低铁气硬性火泥，其特征在于：低铁气硬性火泥的组成及质量百分比为：
低铝莫来石粉 0.5～0.088mm 45～55%，
低铝莫来石粉 <0.088mm 15～25%，
广西白泥粉 <0.047mm 10～20%，
烧结氧化铝粉 <0.047mm 10～20%，
外加CMC 0.8～1.5%，
外加硼酸钠 0.15～0.25%，
外加水玻璃 25～35%；
所述的CMC和硼酸钠作为火泥的增强剂和促凝剂；所述的水玻璃为火泥的结合剂；水玻璃的氧化硅和碱金属氧化物的分子比为2.3～2.8，密度为1.2～1.3g/cm3。
2.如权利要求1所述的一种丙烷脱氢反应器衬里用低铁气硬性火泥，其特征在于：所述的低铝莫来石粉，Al2O3的含量47～60%，Fe2O3的含量小于1.2%。
3.如权利要求1所述的一种丙烷脱氢反应器衬里用低铁气硬性火泥，其特征在于：所述的广西白泥粉，Al2O3的含量38%，Fe2O3的含量小于0.5%。
4.如权利要求1所述的一种丙烷脱氢反应器衬里用低铁气硬性火泥，其特征在于：所述的烧结氧化铝粉，Al2O3的含量大于99%，Fe2O3的含量小于0.1%。
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