CN2089367U

CN2089367U - Straight shaped tube group

Info

Publication number: CN2089367U
Application number: CN 91212479
Authority: CN
Inventors: 谢定中; 芦健; 严朝建; 李春阳
Original assignee: HUNAN PROV CHEMICAL FERTILIZER
Current assignee: HUNAN PROV CHEMICAL FERTILIZER
Priority date: 1991-04-08
Filing date: 1991-04-08
Publication date: 1991-11-27

Abstract

The utility model relates to a straight shaped cool pipe group used for a synthetic tower for producing synthetic ammonia and methanol, mainly comprising an upper and a lower ring pipes (9), (4) whose cross sections form elliptical shapes, straight shaped cool pipes (5), (6), (7), a gas guiding pipe (10), a hot gas rising pipe (2), and venting short pipes (8 a), (8 b), (13 a), (13 b). As the elliptical ring pipes and shaped cool pipes are used and the venting short pipes are arranged, the stress bending stress condition of the cool pipes are greatly improved; simultaneously, the ventilation resistance is reduced; accordingly, the heat exchanging effect is improved, the service lift of the cool pipe group can be extended, and the cool pipe group can be prevented from being damaged.

Description

Straight shaped tube group

A kind ofly relate to straight shape reducing cooler tube bundle, be used for the synthetic tower of synthetic ammonia and methanol production, belong to chemical industry equipment.

Now use the cooler tube bundle in the ammonia converter internals, its structure is an endless tube up and down, is attached thereto with cold pipe between two endless tubes, last endless tube is provided with wireway, following endless tube links to each other with two hot gas tedges, also is provided with thermometer boss between two endless tubes, so that measure the outer hot gas temperature of cooler tube bundle.Endless tube and being connected of cold pipe were that two ends with cold pipe curve certain radian and join with ring tube then in the past.There is following problem in this version, because two endless tubes are bigger, gas is detained the very big resistance of generation outside endless tube; Bend pipe is processed at cold pipe two ends, and bent place forms bigger bending stress at bend pipe, is in operation changed by high temperature and the generation thermal stress, and cold pipe ruptures easily; Be pipe or flat tube now, in catalytic bed, often cause channeling, influence heat exchange and synthetic reaction effect with cold pipe.

According to last, the purpose of this utility model is to provide a kind of bending stress little, and gas-flow resistance improves, good effect of heat exchange, and cold pipe is easy fracture not, the straight shape reducing cooler tube bundle of long service life.

Endless tube up and down of the present utility model, its cross section is designed to ellipse, and the cold Guan Ze that links to each other with endless tube up and down is designed to circle-flat-circle-flat-straight shape reduced pipe of circle, in cold pipe divides, in, outer three layers of endless tube with two ends are welded into whole and communication, interior, middle level and in, between the outer cold pipe, be interspersed with the ventilation short tube that connects endless tube.Cold air is entered by the wireway of last endless tube upper end, through the cold air after being heated after the cooler tube bundle heat exchange, is collected in down endless tube and enters in the reaction bed on the cooler tube bundle via the hot gas tedge, finishes a course of reaction, realizes above-mentioned purpose with this.

Below in conjunction with accompanying drawing and typical structure embodiment in detail, the course of work of the present utility model and architectural feature are described in detail.

Description of drawings

Fig. 1 is conventional cooler tube bundle sectional side elevation

Fig. 2 is that conventional cold tubular axis is to view

Fig. 3 is straight shape reducing cooler tube bundle longitudinal section

Fig. 4 is straight shape reduced pipe axial view

Referring to Fig. 1 and Fig. 2, its upper and lower endless tube (04) of existing cooler tube bundle and (01), its cross section is circular, outer cold pipe (02), the cold pipe in middle level (03), the cold pipe of internal layer (04) join with endless tube up and down, the cold pipe of ectonexine (04) and (04) two ends are processed into bend pipe in advance and are welded then, and cold pipe just is subjected to bending stress man-hour adding.Be subjected to temperatures involved when operation, produce thermal stress again, cold pipe force-bearing situation is comparatively abominable, the cold pipe fracture of therefore normal generation, and shorten its service life.Do not have the ventilation short tube in addition between the cold tube layer, between cold tube layer, produce the air-flow stagnant regions easily, and gas causes reactivity to reduce the heat exchange weak effect producing channeling along the attached laminar flow of tube wall is moving.For endless tube up and down because its cross section be circular, the branch of no major and minor axis, and on the bottom of endless tube and the top of last endless tube, all need hole and with the welding of cold pipe, the arc surface radius of curvature is less relatively, and boring and welding be difficulty relatively, and gas flow resistance outside pipe is bigger.

Consult Fig. 3 and Fig. 4, the utility model is by sleeve pipe (1A) about the thermometer and (1B), hot gas tedge (2), under locate gusset (3), on locate gusset (11), down endless tube (4), outer cold pipe (5), the cold pipe in middle level (6), the cold pipe of internal layer (7), last ventilation short tube (8A) reaches (8B), goes up endless tube (9), wireway (10), central tube (12), and following ventilation short tube (13A) and (13B) form.Endless tube (9) and (4) are annulus up and down, its cross section is oval, locate gusset (11) and (3) up and down for circular dull and stereotyped, the plate center is processed with through hole, outward,, the cold pipe of internal layer (5), (6), (7) be straight shape reduced pipe, its axial shape is circle-flat-circle-flat-circle, and round section, flat section appearance and size is inequality.

Endless tube (9) and (4) are positioned at the two ends of cooler tube bundle up and down, and gusset (11) is located at its interior ring place respectively and up and down and (3) weldering is one, and central tube (12) passes from the central through hole of two gussets, to guarantee the vertical and axiality of central tube (12).The top of last endless tube (9) and wireway (10) welding are also linked up, and cold air enters endless tube (9) by wireway (10).The top of the bottom of last endless tube (9) and following endless tube (4), by outward, in, the cold pipe of internal layer (5), (6), (7) be welded into one with it and link up.Between outer and middle level and middle level and the cold pipe of internal layer, be interspersed with and connect up and down that ventilation short tube (8A), (8B) of endless tube (9) and (4) reach (13A), (13B), make between two endless tubes and unobstructed, the flow resistance minimizing of air-flow between the cold tube layer, avoid and reduce cold interstitial gas flow hysteresis phenomenon, owing to cold Guan Weizhi shape reduced pipe, air-flow changes along the tube wall flowing velocity, turbulization simultaneously, the channeling of gas is overcome, and the heat exchange effect improves.Weld mutually with hot gas tedge (2) and be communicated with in the following right upper portion of endless tube (4), enter the cold air of endless tube (9) from wireway (10), synthetic hot gas outside cooler tube bundle and cold pipe in the catalytic bed carries out heat exchange, flow to and be collected in down endless tube (4), the cold air after being heated enters by hot gas tedge (2) in the catalytic bed on cooler tube bundle top and carries out catalytic reaction.For measuring the temperature of the synthesis gas in the catalytic bed, sleeve pipe (1B) reaches (1A) about the right side of endless tube (9) and (4) is provided with the thermometer that connects endless tube up and down, and thermometer inserts from sleeve pipe, is used for measuring the temperature of the synthesis gas in the catalytic bed.

The utility model is through test, and can prolong more than the twice service life of cooler tube bundle, and good effect of heat exchange.

Claims

1, a kind ofly relate to straight shape reducing cooler tube bundle, the synthetic tower that is used for synthetic ammonia and methanol production, mainly utilize cold pipe of straight shape reducing and oval transversal ring tube, improve the force-bearing situation of cooler tube bundle and endless tube, improve the heat exchange effect, reduce flow resistance, it is characterized in that, cooler tube bundle is by last endless tube [9], following endless tube [4], wireway [10], last ventilation short tube [8A], [8B], following ventilation short tube [13A], [13B], on the thermometer, setting of casing [18] and [1A], the cold pipe of internal layer [7], the cold pipe in middle level [6], outer cold pipe [5], on, under locate gusset [11] and [3], hot gas tedge [2], central tube [12] is formed, endless tube [9] and [4] are ring tube up and down, its cross section is oval, two endless tubes place cooler tube bundle two ends up and down respectively, by the cold pipe of skin [5], the cold pipe in middle level [6], the two ends of the cold pipe of internal layer [7] are with endless tube [9] and [4] are welded into whole and link up up and down, wireway [10] is connected with the top of last endless tube [9] and links up, cold air enters endless tube [9] by wireway [10], the top of following endless tube [4] is connected with hot gas tedge [2] and links up, the cold air of heating back pipe thus enters in the catalytic bed, locate gusset [3] and [11] up and down and be circular slab, be one with endless tube [9] up and down and [4] weldering respectively, the center of every block of plate is processed with a through hole, central tube [12] runs through the central through hole of locating gusset [11] and [3] up and down, thermometer up and down sleeve pipe [1B] and [1A] from the right side break-through of cooler tube bundle endless tube [9] and [4] up and down.

2, straight shape reducing cooler tube bundle according to claim 1, it is characterized in that, the lower end of last endless tube (9), the following upper end of endless tube (4), the two ends by the cold pipe of skin (5), the cold pipe in middle level (6), the cold pipe of internal layer (7) are welded into a whole mutually, and cold pipe and endless tube are linked up.

3, straight shape reducing cooler tube bundle according to claim 1, the axial shape that it is characterized in that cold pipe is circle-flat-circle-flat-circle, round section, flat section appearance and size is inequality.

4, straight shape reducing cooler tube bundle according to claim 1, it is characterized in that between the cold pipe of skin (5), the cold pipe in middle level (6), between the cold pipe in middle level (6) and the cold pipe of internal layer (7), be interspersed with and connect the ventilation short tube (8A) of going up endless tube (9) and (8B) and connect ventilation short tube (13A) and (13B) of endless tube (4) down.