【摘要】：研究了P-RC APMP廢水的沸騰傳熱系數(shù),實(shí)驗(yàn)在強(qiáng)制循環(huán)蒸發(fā)器上進(jìn)行,考察了熱通量、流體流速、流體濃度對(duì)P-RC APMP廢水沸騰傳熱系數(shù)的影響。 實(shí)驗(yàn)結(jié)果表明,在一定的熱通量下,隨著流體流速的增加,P-RC APMP廢水沸騰傳熱系數(shù)增加。濃度不同,流速對(duì)傳熱系數(shù)的影響不同,隨著濃度的增大,流速對(duì)傳熱系數(shù)的影響越大。 采用不同的多效蒸發(fā)流程,根據(jù)測(cè)得的沸騰傳熱系數(shù)對(duì)其蒸發(fā)能耗進(jìn)行了核算,并與熱泵蒸發(fā)的能耗進(jìn)行了對(duì)比,結(jié)果表明,五效順流蒸發(fā)每蒸出一噸水需要18.52kg標(biāo)煤,三效順流蒸發(fā)每蒸出一噸水需要26.17kg標(biāo)煤,而太陽(yáng)紙業(yè)的熱泵蒸發(fā)生產(chǎn)數(shù)據(jù)是每蒸出一噸水需要6.81kg標(biāo)煤,從以上結(jié)果可以看出,P-RC APMP廢水在2.22～12.40%這個(gè)范圍內(nèi),熱泵蒸發(fā)具有比較大的優(yōu)勢(shì)。 研究了廢水的各項(xiàng)物化性質(zhì),包括波美度,相對(duì)密度,粘度,表面張力,比熱容,沸點(diǎn)升高值和固形物的元素分析,為廢水處理提供理論依據(jù)。 實(shí)驗(yàn)結(jié)果表明, P-RC APMP廢水和BCTMP廢水的相對(duì)密度、波美度與濃度都呈很好的正比線性關(guān)系,與溫度都呈反比線性關(guān)系。 粘度隨著濃度的增大而增大,溫度的升高而減小,P-RC APMP廢水濃度超過(guò)約40%時(shí),粘度急劇增大；BCTMP廢水濃度超過(guò)約30%時(shí),粘度急劇增大 P-RC APMP廢水的表面張力隨著濃度的增大,開(kāi)始變化不大,當(dāng)濃度超過(guò)約35%時(shí),表面張力隨著濃度的增大而增大,隨著溫度的升高而逐漸減��；BCTMP廢水的表面張力隨著濃度的增大,先略有減小,當(dāng)濃度超過(guò)約15%時(shí),表面張力又隨著濃度的增大而增大,隨著溫度的增大而逐漸減小 P-RC APMP廢水和BCTMP廢水的比熱容與其固形物含量有關(guān),都是隨著固形物含量的增大而減小,與固形物含量呈很好的線性關(guān)系。 P-RC APMP廢水的沸點(diǎn)于升高值與濃度成正比,當(dāng)濃度超過(guò)30%時(shí),隨著濃度的增大,沸點(diǎn)升高值增大的越來(lái)越快。 C元素在P-RC APMP廢水固形物中所占的比例為31.18%,N元素為0.46%,H元素為3.93%,S元素為0.008%。 P-RC APMP廢水固形物的無(wú)機(jī)物含量為30.26%,有機(jī)物含量為69.74%,燃燒熱為12457kJ/kg; BCTMP廢水固形物的無(wú)機(jī)物含量為25.66%,有機(jī)物含量為74.34%,燃燒熱為16380kJ/kg。
[Abstract]:The boiling heat transfer coefficient of P-RC APMP wastewater was studied. The effects of heat flux, fluid flow rate and fluid concentration on boiling heat transfer coefficient of P-RC APMP wastewater were investigated. The experimental results show that the boiling heat transfer coefficient of P-RC APMP wastewater increases with the increase of flow rate under certain heat flux. The effect of flow velocity on heat transfer coefficient is different with the increase of concentration, and the effect of flow rate on heat transfer coefficient is greater with the increase of concentration. According to the measured boiling heat transfer coefficient, the evaporation energy consumption is calculated by using different multi-effect evaporation processes, and compared with the energy consumption of heat pump evaporation. The results show that 18.52kg standard coal is required for every ton of water evaporated by five-effect downstream evaporation. The 26.17kg standard coal is required for every ton of water evaporated by the three-effect downstream flow, while the heat pump evaporation production data for the Sun Paper industry is that each ton of water needs the 6.81kg standard coal for each ton of water evaporated. As can be seen from the above results, In the range of 2.22 ~ 12.40% for P-RC APMP wastewater, heat pump evaporation has a great advantage. The physicochemical properties of wastewater were studied, including wave beauty, relative density, viscosity, surface tension, specific heat capacity, boiling point elevation value and elemental analysis of solid, which provided theoretical basis for wastewater treatment. The experimental results show that the relative density of P-RC APMP wastewater and BCTMP wastewater are both proportional to the concentration and inversely proportional to the temperature. The viscosity increases with the increase of concentration and decreases with the increase of temperature. When the concentration of P-RC APMP wastewater exceeds about 40%, the viscosity increases sharply. When the concentration of BCTMP wastewater exceeded about 30%, the viscosity of P-RC APMP wastewater increased sharply, and the surface tension of P-RC APMP wastewater began to change little with the increase of concentration. When the concentration exceeded about 35%, the surface tension of P-RC APMP wastewater increased with the increase of concentration. With the increase of temperature, the temperature decreases gradually. The surface tension of BCTMP wastewater decreases slightly with the increase of concentration. When the concentration exceeds 15, the surface tension increases with the increase of concentration. With the increase of temperature, the specific heat capacity of P-RC APMP wastewater and BCTMP wastewater is related to the content of solids, both of which decrease with the increase of solid content, and there is a good linear relationship between the specific heat capacity of P-RC APMP wastewater and BCTMP wastewater. The boiling point of P-RC APMP wastewater is directly proportional to the concentration. When the concentration exceeds 30%, the boiling point increases faster and faster with the increase of the concentration. The proportion of C element in the solid form of P-RC APMP wastewater is 31.18% and N element is 0.46% and H element is 3.93% and S element is 0.008%. The inorganic content of P-RC APMP waste water is 30.26, the content of organic matter is 69.74, the combustion heat is 12457 KJ / kg, the inorganic content of BCTMP waste water is 25.66g, the content of organic matter is 74.34 and the combustion heat is 16380kJ / kg.
【學(xué)位授予單位】：天津科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2011
【分類(lèi)號(hào)】：X793

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