저밀도 폴리에틸렌 관형 반응기의 총괄 열전달 계수 추정

김재연; 이희석

HWAHAK KONGHAK, Vol.37, No.3, 494-498, June, 1999

Export Citation

저밀도 폴리에틸렌 관형 반응기의 총괄 열전달 계수 추정

Prediction of Overall Heat Transfer Coefficient for Low Density Polyethylene Tubular Reactors

김재연, 이희석

초록

저밀도 폴리에틸렌 관형 반응기의 총괄 열전달 계수를 최적화 기법을 이용하여 도출하였다. 최적화 기법으로는 quasi-Newton 방법을 사용하였으며 도출된 열전달 관계식으로부터 관형 반응기의 조업 조건의 변화에 따른 열전달량 변화를 예측할 수 있었다. 문헌에 보고된 여러 가지 열전달 계수 구하는 방법을 사용하여 실제 반응기 온도와 비교 검토하여 본 결과 실제 온도를 잘 예측하지 못하였다. 그러나, 본 고에서 제안한 상관 관계식을 이용한 온도 분포 계산 결과와 실제 조업 온도 분포가 매우 일치하는 것을 알 수 있었다.

The overall heat transfer coefficient(OHTC) for low density polyethylene tubular reactors was predicted by using a nonlinear optimization method. Quasi-Newton method was applied and the amount of heat transfer was predicted for variations of operating conditions by using the correlation equation. The simulation data using the previous OHTC correlations did not agree with plant operation data. On the contrary, it was shown that it agreed well with plant data when our proposed correlation was used.

Keywords:LDPE;Tubular Reactor;Heat Transfer;Dynamics;Optimization

[References]

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[4] Kiparissides C, Mavridis H, in Chemical Reactor Design and Technology (NATO ASI Series E: Applied Sciences, No. 110), H. de Lasa, Ed., 1983 (1983)

[5] Han CD, Liu TJ, HWAHAK KONGHAK, 15(4), 249 (1977)

[6] Goto S, Yamamoto K, Furui S, Suginoto M, J. Appl. Polym. Sci., 36, 21 (1981)

[7] Goto S, Yamamoto K, Furui S, Suginoto M, Appl. Polym. Symp., 36, 21 (1981)

[8] Shirodkar PP, Tsien GO, Chem. Eng. Sci., 41(4), 1031 (1986)

[9] Agrawal S, Han CD, AIChE J., 21(3), 449 (1975)

[10] Chen CH, Vermeychuk JG, Howell JA, Ehrlich P, AIChE J., 22(3), 463 (1976)

[11] Sieder EN, Tate GE, Ind. Eng. Chem., 28(12), 1429 (1936)

[12] Mavridis M, Kiparissides C, Polym. Proc. Eng., 3(3), 263 (1985)

[13] Donati G, Marini L, Marziano G, Mazzaferri C, Spampinato M, Langianni E, Am. Chem. Soc. Symp. Ser., 196, 579 (1981)

[14] Gupta SK, Kumar A, Krishnamurthy MVG, Polym. Eng. Sci., 25(1), 37 (1985)

[15] Brandolin A, Capiati NJ, Farber JN, Valles EM, Ind. Eng. Chem. Res., 27(5), 784 (1988)

[16] Kiparissides C, Verros G, Kalfas G, Koutoudi M, Kantzia C, Chem. Eng. Commun., 121, 193 (1993)

[17] Zabisky RCM, Chan WM, Gloor PE, Hamielec AE, Polymer, 33(11), 2243 (1992)

[18] Brandolin A, Lacunza MH, Ugrin PE, Capiati NJ, Polym. React. Eng., 4(4), 193 (1996)

[19] Benzler H, Koch A, Chem. Ing. Tech., 2, 71 (1955)

[20] Reid RC, Prausnitz JM, Sherwood TK, "The Properties of Gases and Liquids," McGraw-Hill, N.Y. (1977)

[21] Maloney DP, Prausnitz JM, J. Appl. Polym. Sci., 18, 2703 (1974)

[22] Eiermann K, Koll. Z., 201, 3 (1964)

[23] Ehrlich P, Woodbrey JC, J. Appl. Polym. Sci., 13, 117 (1969)

[24] Kim JY, Yi HS, Polym. Sci. Technol., in press (1999)