[특허]Bayonet tube heat exchanger

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Bayonet tube heat exchanger

특허상세정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	F28B-009/10 F28B-009/08
미국특허분류(USC)	165/001; 165/113; 165/142; 165/158
출원번호	US-0617760 (1984-06-06)
발명자 / 주소	Williamson, William R.
대리인 / 주소	Bode, George A.
인용정보	피인용 횟수 : 19 인용 특허 : 1

초록
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A bayonet tube heat exchanger and the method of use of the exchanger, the exchanger having a bayonet tube positioned within a sheath, the bayonet tube is used to create an annulus with the sheath for condensing vapors inside the sheath and to remove condensate and non-condensible gases under vacuum through the bayonet tube. An alternate embodiment uses an insulated plastic bayonet tube positioned within a sheath, the plastic bayonet tube used as an inlet for fluids into a small annular passage between the bayonet tube and its sheath with high turbulence ...

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1. A method for operating a bayonet tube heat exchanger comprising: (a) forming a first fluid flow zone between the inner surface of a shell having a closed end and the outer surface of a tubular thin gauge sheath having a closed end, the closed end of the sheath being spaced from the closed end of the shell; (b) forming a second fluid flow zone between the inner surface of the sheath and the outer surface of a bayonet tube concentrically inserted into said sheath, the inner end of said bayonet tube being open and spaced from the closed end of said sheath, and the outer end of said bayonet tube extending outside said second fluid flow zone; (c) causing a first fluid to flow through said first fluid flow zone; (d) causing a second fluid to flow through said second fluid flow zone wherein said second fluid is condensed in heat exchange relation with said first fluid flow zone, said second fluid flow zone including the annulus formed between said bayonet tube and the inner surface of said sheath; (e) directing said second fluid into said annulus in the direction of said open end of said bayonet tube; applying a vacuum source to the outer end of said bayonet tube for directing fluid flow in said bayonet tube in the direction opposite that of said second fluid flow in said annulus for removing condensate and non-condensible gases entrained in said second fluid from said annulus to said vacuum source; and (g) removing condensate from said second fluid flow zone. 2. The method of claim 1 further comprising applying a vapor compressor to said first fluid flow zone thereby compressing said vapor and passing said compressed vapor to said second fluid flow zone wherein said vapor is condensed. 3. The method of claim 1, wherein the cross-sectional area of said bayonet tube is approximately 1/16 of the cross-sectional area of its concentric sheath. 4. A bayonet tube heat exchanger comprising: (a) a substantially horizontal outer shell having an elongated center section, an inner end having a first tube sheet closure and a closed distal end; (b) at least one thin gauge tubular sheath having a closed end adjacent but spaced from said closed distal end of said shell and an open end facing said first tube sheet closure of said shell; (c) means for forming a first fluid flow zone between the outer surface of said sheath and said shell; (d) a bayonet tube concentrically positioned in at least one of said sheaths, said bayonet tube piercing said first tube sheet closure, and having an outer portion extending at least through said first tube sheet closure and an inner portion terminating in an open end spaced from said closed end of said sheath; (e) means for forming a second fluid flow zone wherein a second fluid is condensed in heat exchange relation with said first fluid flow zone, said second fluid flow zone including the annulus formed between said bayonet tube and the inner surface of said sheath; (f) means for directing said second fluid into said annulus in the direction of said open end of said bayonet tube; (g) means for removing condensate from said second fluid flow zone; and (h) means for applying a vacuum source to the outer end of said bayonet tube for directing fluid flow in said bayonet tube in the direction opposite that of said second fluid flow in said annulus whereby condensate and non-condensible gases entrained in said second fluid are removed from said annulus to said vacuum source. 5. The bayonet tube heat exchanger according to claim 4 wherein said means for applying said vacuum source is a pipe for fluid communication to said vacuum source. 6. The bayonet tube heat exchanger according to claim 4, wherein said means for applying a vacuum source to said outer end of said bayonet tube comprises a vacuum chamber adjacent said first tube sheet closure and in fluid communication with a vacuum source, said outer end of said bayonet tube opening into said vacuum chamber. 7. The bayonet tube heat exchanger of claim 6, wherein the closed distal end of said shell includes a sight window. 8. The bayonet tube heat exchanger of claim 6, wherein the side of said vacuum chamber opposite the first tube sheet includes a sight window. 9. The bayonet tube heat exchanger according to claim 4, including a plurality of tubular sheaths each with its concentric bayonet tube and wherein said means for forming said first fluid flow zone includes a second tube sheet closure joining the outer surfaces of the open ends of said sheaths and the inner surface of said shell, and wherein said means for forming said second fluid flow zone includes a plenum between said second tube sheet closure, said first tube sheet closure and said shell. 10. The bayonet tube heat exchanger of either of claims 4 or 9, having a circular plate for positioning bayonet tubes in sheaths, said plate having a diameter substantially equal to the inner diameter of said shell and having a plurality of holes, said holes corresponding to the sheaths in number and located in said plate in corresponding relationship to said sheaths, said holes having a diameter slightly larger than and engageable for sliding relationship with said bayonet tubes when the open ends of said bayonet tubes are inserted in said holes, and means for positioning said plate in the heat exchanger at a fixed distance from said first tube sheet closure. 11. The plate of claim 10, wherein the means for positioning the plate a fixed distance from the first tube sheet includes a plurality of spacer rods fixed at one end to the plate. 12. The bayonet tube heat exchanger according to claim 9, wherein said means for forming said first and second fluid flow zones include at least one inlet and one outlet for each said zone, the inlet and outlet for said second zone opening into said plenum, and wherein said means for removing condensate from said second fluid flow zone includes said outlet for said second fluid flow zone. 13. The bayonet tube heat exchanger according to claim 4, 9 or 12, wherein the cross-sectional area of each bayonet tube is approximately 1/16 the cross-sectional area of its concentric sheath. 14. The bayonet tube heat exchanger according to claim 14, 9 or 12, wherein each tubular sheath is inclined downwardly toward said first tube sheet closure of said shell. 15. The bayonet tube heat exchanger according to claim 9, wherein said means for forming a first fluid flow zone includes at least one inlet and one outlet through said shell, and wherein said means for forming a second fluid flow zone includes an inlet through said outer portion of at least one of said bayonet tubes and an outlet through at least one other of said bayonet tubes. 16. The bayonet tube heat exchanger according to claim 9 wherein said means for forming a first fluid flow zone includes at least one inlet and one outlet through said shell, and wherein said means for forming a second fluid flow zone includes an inlet through said outer portion of each said bayonet tube and at least one outlet through said shell. 17. The bayonet tube heat exchanger of claim 16 including an inlet feed chamber into which said outer portions of said bayonet tubes open. 18. The bayonet tube heat exchanger according to claim 4 wherein said means for forming a first fluid flow zone includes at least one inlet and one outlet through said shell, and wherein said means for forming a second fluid flow zone includes an inlet through said outer portion of each said bayonet tube and at least one outlet through said shell. 19. The bayonet tube heat exchanger according to any one of claims 4, 9, 18 and 16, wherein each of said sheaths is formed of corrosion resistant metal. 20. The bayonet tube heat exchanger of claim 19 wherein said corrosion resistant metal is titanium. 21. The bayonet tube heat exchanger of claim 18 including an inlet feed chamber into which said outer portions of said bayonet tubes open. 22. The bayonet tube heat exchanger according to any one of claims 21, 17 and 15, wherein said open end of said bayonet tube is bevelled around its exterior circumference. 23. The bayonet tube heat exchanger of any one of claims 18, 16, 21, 17 and 15, wherein the bayonet tubes and the sheaths are dimensioned to provide an annular passage between the sheath and the bayonet tube having a cross-sectional area which is less than twenty-five (25%) percent of the inner cross-sectional area of the sheath. 24. The bayonet tube heat exchanger according to claim 18, wherein each of said bayonet tubes is formed of insulating material for preventing reheating of fluid flowing in said second fluid flow zone. 25. The bayonet tube heat exchanger of claim 24, wherein the bayonet tube has positioning means for maintaining said tube uniformly cncentric within said sheath. 26. The bayonet tube heat exchanger of claim 25, wherein said positioning means includes three spacers each projecting radially from said bayonet tube at 120° apart from each other around the circumference of said bayonet tube. 27. The bayonet tube heat exchanger according to claim 24, wherein said insulating material is plastic. 28. The bayonet tube heat exchanger according to claim 27, wherein said plastic bayonet tube is spirally grooved on its external surface whereby turbulent flow is imparted to said second fluid. 29. The bayonet tube heat exchanger according to claim 27, wherein each of said sheaths are provided with means for imparting turbulent flow to said second fluid. 30. The bayonet tube heat exchanger according to claim 29, wherein said means for imparting turbulent flow to said second fluid comprises spirally grooved external surfaces of said sheaths. 31. A freon heat pump comprising: (a) a freon compressor; and (b) a freon chiller comprising: i. a substantially horizontal outer shell having an elongated center section, and inner end having a first tube sheet closure and a closed distal end; ii. at least one externally finned tubular sheath having a closed end adjacent but spaced from said closed distal end of said shell and an open end facing said first tube sheet closure of said shell; iii. means for forming a first fluid flow zone between the outer surfaces of said finned sheath and said shell; iv. an insulating plastic bayonet tube concentrically positioned in at least one of said sheaths, said bayonet tube piercing said first tube sheet closure and an inner portion terminating in an open end spaced from the closed end of said sheath; and v. means for forming a second fluid flow zone wherein a second fluid is condensed in heat exchange relation with said first fluid flow zone, said second fluid zone including the annulus formed between said bayonet tube and the inner end of said sheath; vi. means for directing said second fluid into said annulus in the direction of said open end of said bayonet tube; vii. means for removing condensate from said second fluid flow zone; and viii. means for applying a vacuum source to the outer end of said bayonet tube for directing fluid flow in said bayonet tube in the direction opposite that of said second fluid flow and said annulus whereby condensate and non-condensible gases entrained in said second fluid are removed from said annulus to said vacuum source.

이 특허에 인용된 특허 (1)

Bailey Clyde E. (Beatrice NE). Bayonet heat exchanger having means for positioning bayonet tube in sheath tube. USP1979034142580.

이 특허를 인용한 특허 피인용횟수: 19

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Bayonet tube heat exchanger

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Bayonet tube heat exchanger

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