機(jī)械設(shè)計(jì)外文翻譯--新型板式換熱器的優(yōu)化選型-其他專業(yè)-資料下載頁
2025-01-19 06:04本頁面
【導(dǎo)讀】力）選擇板片形狀、板式換熱器的類型和結(jié)構(gòu)。面積的平均值，就能出換熱器的傳熱量。平均溫差是一個(gè)較為直觀的概念，也是評(píng)。價(jià)板式換熱器性能的一項(xiàng)重要指標(biāo)。容量，它表示單位時(shí)間通過單位面積交換的熱量，即dQ＝KdA＝K△tdA，0積分至A＝A0時(shí)，A0＝[1／k]·㏑[／]，t1＝thi－tco，△t2＝tho－tci，則Q＝KA0[／㏑]＝KA0△。順流△tm＝[－]／㏑[／]. △t2為3時(shí)，則誤差約為10%。對(duì)于板式換熱器來說，KA／MC＝△t／△tm，式中△t／△tm稱為溫差比，上。式中的右邊的工藝過程用NTUp表示，左邊的換熱設(shè)備的條件用NTUE表示。變化的值，當(dāng)△tm大時(shí)，NTUp則?。划?dāng)△tm小時(shí)，它有變大的傾向。當(dāng)NTUE是總數(shù)時(shí)，若每1流程數(shù)。程，故設(shè)計(jì)時(shí)應(yīng)先預(yù)定n。積，為了使傳熱面積不至過大，唯一的是增大傳熱系數(shù)K。在區(qū)域供冷中時(shí)，檢測(cè)的△tm約為。在作為冰蓄冷的乙二醇和冷凍水的換熱器。應(yīng)于熱泵機(jī)組的新型換熱器。與管殼式蒸發(fā)器、冷凝器相比，它具有如下優(yōu)點(diǎn)：單
【正文】 s, evaporator plate, the plate condenser in the heat transfer coefficient △ tm about ~ 3 ℃ , in 1500 ~ 2021 W / ㎡ ? K between the resistance and small, satisfying the heat pump units Requirements. ⑵ small NTU (∽ ~ 2), the △ tm (∽ 40 ~ 90 ℃ ) of the plate heat exchanger to meet the heat recovery process and the process heating and cooling requirements. When the process in the △ tm conducted under conditions of heat transfer, that driving force, the heat and the smaller, the heat transfer coefficient demand is not high, but that this process or highpressure work, or work High temperature, or process heating and cooling process in the liquid containing fiber diameter or larger particles, the plate heat exchanger, the pressure, temperature and ability to request, the heat exchanger to the plate spacing requirements. ① Pai (breathing) gas water shell heat exchanger (Province can), Pai (breathing) gas shellair heat exchangers (air preheater) is a heat exchanger in Beijing Beijingequipment manufacturers limited liability Portland petrochemical panies and codeveloped a new type of plate heat exchanger, all welded plate heat exchanger in the heat transfer through the medium to achieve the control board, posed of board control by the plate for forming mold suppression, allwelded Beam installed in the pressure shell. Corrugated plate with static mixing, in a very low Reynolds number formed under the turbulence, and low coefficient of dirt, the heat transfer coefficient is the shell and tube heat exchanger of the two or three times. In order to adapt to the heat transfer, fluid pressure on the request, board space, equivalent diameter of about 28 mm. In order to meet the demands of work pressure plate beam (Antipressure) P ≤ Mpa, the pressure plate beam (pressure) with the pressure shell, unrestricted。 temperature t ≤ 550 ℃ . Urumqi Petrochemical Company 400,000 tons / year for a restructuring of the feed (cold medium) and discharging (medium heat) of the plate heat exchanger, feed flow 50 t / h, import and export temperature crossing 88 ℃ , 470 ℃ . Expected to flow 50 t / h, import and export temperature 100 ℃ , 500 ℃ , the average temperature of about 38 ℃ , the heat transfer coefficient of about 380 kcal / ㎡ ? h ? ℃ , thermal negative Heda 23 106kcal / h, feed Pressure Drop 20 Kpa, the expected pressure drop 50 Kpa. ② multieffect evaporation plate heater (heat exchanger), which is a heat exchanger of heating device, it is important to heat recovery unit. As previously plate heat exchanger, the flow of small ( to pitch), not in the gas gas and steam condensing heat exchanger, and easy to plug, it is not appropriate for the suspension of containing the fluid. In order to maximize plate heat exchanger to play the strengths to overe the existing problems and adapt to the demands of BeijingBeijing heat transfer equipment manufacturers limited liability pany developed a new type of multieffect evaporation plate heat exchanger, this plate heat exchanger A wideflow, the board spacing of mm, suitable for steam condensate, suitable for containing the suspension of fluid, and difficult to plug, the largest handling capacity of 1200 m3
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