Nhanganyaya

Munyika ine mapombi akawanda, uko tembiricha yakakwira nenzvimbo dzinopisa, kusarudzwa kwezvinhu ndiko kunonyanya kukosha. Pakati pesimbi dzakasiyana-siyana dze chromium-molybdenum (Cr-Mo) alloy, P9 inoonekwa sechinhu chakavimbika uye chakagadzirirwa kushanda pakupisa kwakanyanya. Alloy Steel Pipe P9 ibwe guru mukushandiswa kubva pakugadzira magetsi kusvika pakuchenesa peturu, inokosheswa nekusanganiswa kwayo kwakasiyana kwesimba, kuramba oxidation, uye kugadzikana kwe microstructure.

ChiiChiwanikwa cheSimbi Pombi P9?

P9 pipe ipfungwa inobva kuASTM (American Society for Testing and Materials)Muyero weA335, iyo inofukidza pombi yesimbi isina musono yeferritic alloy-steel inoshandiswa pakupisa kwakanyanya. "P" inomiririra pombi, uye "9" inoreva kuumbwa kwayo kwemakemikoro, ayo ari pakati pe9% chromium uye 1% molybdenum. Kemikari iyi ndiyo kiyi yekushanda kwayo.

Hunhu Hunokosha uye Kuumbwa

Hunhu hwePombi yesimbi yeP9zvinobva muzvinhu zvayo zvakanyatsogadzirwa:

•Chromium (Cr ~9%): Ichi ndicho chinhu chikuru chinopa simba rakawedzerwa rekudzivirira kuoxidation (scaling) uye ngura, kunyanya munzvimbo dzine sarufa. Chinoumba jira rakasimba, rinodzivirira rechromium oxide pamusoro pesimbi.

•Molybdenum (Mo ~1%): Molybdenum inowedzera simba resimbi zvakanyanya pakupisa kwakanyanya. Inobatsira kudzivirira kukambaira, kushanduka kunonoka uye kunoramba kuripo kwezvinhu pasi pekumanikidzwa nguva dzose pakupisa kwakakwira.

Kuumbwa uku kunopa mapombi eP9 mabhenefiti akawanda akakosha:

•Simba Rakanaka Pakupisa Kwakakwirira: P9 inochengetedza kunaka kwayo kwemuchina uye kugona kwayo kutakura mutoro pakupisa kunowanzo kusvika ku1100°F (593)°C), zvichiita kuti zvikodzere kushandiswa kwemhepo ine simba guru uye nzira dzekugadzira zvinhu.

•Kuramba Kuoxidation Zvakanaka: 9% chromium inovandudzika zvikuru mukudzivirira oxidation zvichienzaniswa nesimbi dzakaderera dzealloy dzakadai seP11 kana P22.

•Simba Rakawedzerwa reKuputika kweNyeredzi: Kukwanisa kwayo kutsungirira kushushikana kwakanyanya uye tembiricha kwenguva refu pasina kukundikana ndicho chikonzero chikuru chekushandiswa kwayo mukushandiswa kwakakosha.

•Kugadzikana Kwezvinhu Zvidiki: Chiumbwa ichi chakagadzirwa kuti chisaite kuti simbi isanyanya kusimba izvo zvinogona kukanganisa simbi nekufamba kwenguva panguva yekupisa kwakanyanya.

Maitiro Akajairika

Mapaipi esimbi yeAlloy P9 anonyanya kushandiswa mumaindasitiri umo tembiricha yakakwira inogara iripo:

•Kugadzira Simba: Machubhu eSuperheater nereheater, main steam lines, uye mamwe mapombi anodziya zvakanyanya muzviteshi zvemagetsi zvefossil-fuel.

•Kugadzira nePetrokemikari: Kutamisa mitsetse muzvicheneswa, machubhu ekudziisa, uye mapaipi ekuita mabasa ane mahydrocarbon anodziya zvakanyanya.

•Kugadzira Makemikoro: Kutakura matsime emvura pakupisa kwakakwirira uko kunodiwawo kuti ngura isashande.

Mabhenefiti Pamusoro Pemamwe MaAlloys

Kunyange zvazvo paine akawanda maCr-Mo alloys, P9 ine nzvimbo yayo chaiyo. Inopa simba rakawanda rekudzivirira oxidation uye ine simba rakawanda kupfuura 2.25% Cr (P22) alloy, isina mutengo wakakwira uye kuomarara kwewelding kwemhuri ye9-12% Cr (P91). Izvi zvinoita kuti P9 ive sarudzo inodhura uye yakanaka kune akawanda mashandisirwo epakati nepakati ekupisa.

Mhedziso

Pipe yesimbi yeAlloy P9 chinhu chakayerwa uye chakakosha kune mainjiniya vanogadzira masisitimu emapaipi anodziya zvakanyanya. Musanganiswa wayo wakaenzana we9% chromium uye 1% molybdenum unopa musanganiswa wakakodzera wesimba, kuramba oxidation, uye kugara kwenguva refu. Kune mashandisirwo ayo kuvimbika pasi pekumanikidzwa kwekupisa kusingakurukurwe, P9 inoramba iri mhinduro yakavimbika uye inoshanda zvakanaka.