Kaltsiy fosfat shkalasini oldini olish uchun 90 daraja haroratda 5% natriy tripolifosfat eritmasidagi 7-darajali titan qoplamali isitgich uchun ruxsat etilgan maksimal suv qattiqligi (Ppm CaCO₃) qancha?
Xabar QOLDIRISH
In 5% sodium tripolyphosphate (STPP) at 90°C, calcium ions precipitate as calcium phosphate (Ca₃(PO₄)₂) scale. This scale has low thermal conductivity (0.3–0.6 W/m·K). The maximum allowable water hardness (as CaCO₃) to prevent overheating is 100 ppm. Above 100 ppm, scale thickness exceeds 0.2 mm within 500 hours, causing >30% issiqlik uzatishni kamaytirish.
Miqdoriy shkala shakllanishi va suvning qattiqligi
5% STPP da 90 gradusda 500 soat davomida:
| Qattiqlik (ppm CaCO₃) | Masshtab qalinligi (µm) | Masshtab tarkibi | Issiqlik uzatishni kamaytirish (%) |
|---|---|---|---|
| 0 | 0 | Yo'q | 0 |
| 50 | 10–30 | Kaltsiy fosfat | 5–15 |
| 100 | 30–70 | Kaltsiy fosfat | 15–30 |
| 150 | 60–120 | Zich kaltsiy fosfat | 25–45 |
| 250 | 100–200 | Og'ir shkala | 40–60 |
| 500 | 200–400 | Qattiq o'lchov | 60–80 |
STPP kontsentratsiyasi va haroratining ta'siri
| STPP (%) | Harorat (daraja) | uchun maksimal qattiqlik<0.1 mm Scale (ppm) |
|---|---|---|
| 3 | 90 | 150 |
| 5 | 80 | 150 |
| 5 | 90 | 100 |
| 5 | 100 | 60 |
| 10 | 90 | 50 |
Suvning qattiqligini nazorat qilish bo'yicha qo'llanma
| Qattiqlik (ppm CaCO₃) | Tavsiya etilgan harakat | Kutilayotgan shkala qalinligi (mkm/yil) |
|---|---|---|
| <50 | Yo'q | <30 |
| 50–100 | Oylik monitoring | 30–70 |
| 100–150 | Yumshoq suvdan foydalaning | 70–120 |
| >150 | Suv yumshatgich kerak | >120 |
Muhandislik bo'yicha tavsiya
STPP xizmatini 90 gradusda ishlatish uchun suv yumshatgich yordamida suvning qattiqligini 50 ppm dan past darajada saqlang. Kaltsiy kontsentratsiyasini nazorat qilish orqali muhandis kaltsiy fosfat shkalasi shakllanishi va qizib ketishining oldini oladi.
