ʻO ka Tube Palekana Thermocouple Silicon Carbide i hoʻopaʻa ʻia me Silicon Nitride: ʻO ka pale hope loa no ke ana ʻana o ka mahana ʻoihana

ʻO nā Thermocouples ke kumu o ka nānā ʻana i ka mahana ma nā kaʻina hana ʻoihana he nui ʻole—mai ka hoʻoheheʻe ʻana i ka metala a hiki i ka synthesis kemika. Eia naʻe, hilinaʻi nui kā lākou hana a me ke ola ma luna o hoʻokahi ʻāpana koʻikoʻi: ka paipu pale. I nā ʻano ʻoihana ʻino, ʻaʻole hiki i nā paipu pale thermocouple kuʻuna (i hana ʻia me ka metala, alumina, a i ʻole silicon carbide maʻemaʻe) ke kū i ka wela nui, nā mea ʻino, a i ʻole nā ​​​​​​mea abrasive. Ke alakaʻi nei kēia i nā hoʻololi pinepine ʻana o ka thermocouple, ka ʻikepili mahana pololei ʻole, a me ka manawa hana pipiʻi.

Inā luhi ʻoe i ka hoʻopilikia ʻana i ka hilinaʻi o ka thermocouple,Nā Paipu Hoʻomalu Thermocouple Silicon Carbide i hoʻopaʻa ʻia me Silicon Nitride (NSiC)ʻo ia ka hopena hoʻololi pāʻani āu e pono ai. Hana ʻia e pale i nā thermocouples i nā kūlana koi loa, hōʻoia nā paipu NSiC i ka ʻike mahana kūlike a pololei me ka hoʻonui ʻana i ke ola lawelawe o kāu mau lako ana koʻikoʻi.

No ke aha i kū ai ka Silicon Nitride Bonded Silicon Carbide no ka pale ʻana i ka Thermocouple

Pono nā paipu pale Thermocouple i kahi kaulike kūikawā o nā waiwai: ke kūpaʻa wela, ke kūpaʻa i ka pala, ka ikaika mechanical, a me ka conductivity thermal. ʻOi aku ka maikaʻi o NSiC ma kēia mau wahi āpau, e ʻoi aku ana ma mua o nā mea kuʻuna ma kēlā me kēia metric koʻikoʻi:

1. Ke kū'ē ʻana i ka mahana koʻikoʻi no ka ʻike ʻana me ka hoʻōki ʻole

Hana nā Thermocouples i nā ʻoihana e like me ka hana aniani a i ʻole ka hoʻolei metala i nā mahana i ʻoi aku ma mua o 1,500°C. Hoʻoponopono maʻalahi nā paipu pale thermocouple NSiC i kēia—me ka haʻaheo ʻana i kahi mahana hana mau a hiki i ka 1,600°C (2,912°F) a me ke kū'ē pōkole i 1,700°C (3,092°F). ʻAʻole e like me nā paipu metala e oxidize a hoʻoheheʻe paha, a i ʻole nā ​​​​paipu alumina e haki ma lalo o ka haʻalulu wela, mālama ʻo NSiC i ka pono o ke kūkulu ʻana ʻoiai i ka wā wikiwiki o ka loli o ka mahana. ʻO ke ʻano kēia e palekana mau ana kāu thermocouple, a pololei mau kāu ʻikepili mahana—ʻaʻohe mea pehea ka ikaika o ka wela.

2. Ke kūpaʻa kiʻekiʻe loa i ka palaho e pale aku i nā pāpaho hoʻouka kaua

Hoʻopuka pinepine nā kaʻina hana ʻoihana i nā thermocouples i nā metala hoʻoheheʻe ʻia (alumini, zinc, keleawe), nā hopena waikawa/alkaline, a i ʻole nā ​​​​kinoea corrosive (sulfur dioxide, chlorine). ʻO ke ʻano paʻa o NSiC, nitride-bonded e hana i kahi pale hiki ʻole ke komo i kēia mau mea. ʻAʻole e like me nā paipu silicon carbide maʻemaʻe, kahi i maʻalahi i ka oxidation i nā wahi mahana kiʻekiʻe, hoʻonui ka hoʻohui kūikawā o NSiC i ke kū'ē ʻana i ka oxidation—e hōʻoia ana i ka pale ʻia o kāu thermocouple mai ka corrosion no nā makahiki. He mea koʻikoʻi kēia no nā noi e like me ka hana kemika, ka puhi ʻana i nā ʻōpala, a me ka synthesis mea pākahiko.

3. Ikaika Mekanika Kūikawā e Kūpaʻa i ka ʻAʻahu a me ka Hopena

ʻO nā Thermocouples i loko o nā hale hana sima, nā kikowaena mana, a i ʻole nā ​​​​​​hale hana mineral e kū nei i nā hoʻoweliweli mau: ka lepo abrasive, nā ʻāpana lele, a me ka hopena mechanical. Kūkulu ʻia nā paipu pale thermocouple NSiC e kūʻē i kēia mau pilikia, me ka ikaika flexural ma luna o 300 MPa a me ka paʻakikī Vickers (HV10) o ≥ 1,800. ʻOi aku ka paʻa o kēia mau paipu ma mua o 3-5 mau manawa ma mua o nā paipu kuʻuna, e hōʻemi ana i ka pono no nā hoʻololi pinepine. No kāu mau hana, unuhi kēia i ka emi ʻana o ka downtime, nā kumukūʻai mālama haʻahaʻa, a me ka hana thermocouple hilinaʻi.

4. Ka Hoʻokele Wela Kūpono Loa no nā Heluhelu Wikiwiki a Pololei

Aia ka waiwai o ka thermocouple i kona hiki ke pane koke i nā loli o ka mahana. ʻOi aku ka kiʻekiʻe o ka conductivity thermal o NSiC (60-80 W/(m·K)) ma mua o nā alumina a i ʻole nā ​​​​paipu metala, e hiki ai ke hoʻoili wikiwiki i ka wela mai ke kaʻina hana a i ka hui thermocouple. Hōʻoia kēia i kāu thermocouple e hāʻawi i ka ʻikepili pololei a manawa maoli—koʻikoʻi no ka mālama ʻana i ka kaohi kaʻina hana a me ka maikaʻi o ka huahana. Eia kekahi, ʻo ka coefficient hoʻonui wela haʻahaʻa o NSiC (3.5-4.5 × 10⁻⁶/°C) e hoʻemi i ke kaumaha wela, e pale ana i nā māwae e hiki ke hoʻopilikia i ka pololei o ke ana.

5. Ka lōʻihi o ke kumukūʻai no nā kumukūʻai nona ka huina haʻahaʻa

ʻOiai ʻoi aku ka nui o ka hoʻopukapuka mua ʻana o nā paipu pale thermocouple NSiC ma mua o nā koho kuʻuna, ʻo ko lākou ola lawelawe lōʻihi (2-5 mau makahiki i nā kūlana ʻino) a me nā pono mālama liʻiliʻi e hāʻawi i nā mālama kālā lōʻihi. Ma ka hōʻemi ʻana i ka pinepine o ka hoʻololi thermocouple a me ka manawa hana ʻole, hoʻohaʻahaʻa ʻo NSiC i kāu kumukūʻai āpau o ka loaʻa ʻana (TCO) a hoʻonui i kāu hoʻihoʻi ma ka hoʻopukapuka kālā (ROI). No nā hale hana ʻoihana e ʻimi nei e hoʻonui i ka pono, he koho akamai kēia, no ka wā e hiki mai ana.