CN218821739U - Tower top shell-and-tube condenser of ammonia still - Google Patents

Abstract

The utility model discloses an ammonia still top of tower shell and tube type condenser, including front end tube case, front end tube sheet, buffer cylinder, shell side barrel, rear end tube sheet and rear end tube box, one side and the front end tube box of front end tube sheet are connected, and the opposite side is connected with the one end of buffer cylinder, and in the one end clearance of shell side barrel inserted the other end of buffer cylinder, one side of rear end tube sheet was connected with the other end of shell side barrel, and the opposite side is connected with the rear end tube box, is provided with the branch journey baffle in the front end tube box. The utility model discloses a set up shell side barrel clearance male buffer cylinder to ammonia steam gets into the annular space between buffer cylinder and the shell side barrel by the ammonia steam import, has solved the problem that the heat exchange tube can not be covered with, has stopped the production in top heat transfer blind spot, prevents the steam flow short circuit, has improved the efficiency of condensation.

Description

Tower top shell-and-tube condenser of ammonia still

Technical Field

The utility model relates to an ammonia distillation retrieves technical field, concretely relates to ammonia still tower top of tower shell and tube condenser.

Background

In the production process of industrial enterprises such as nonferrous metallurgy, new energy anode materials and the like, the ammonia nitrogen is removed from the generated high-concentration ammonia nitrogen wastewater by adopting a steam stripping ammonia evaporation method. After the high-concentration ammonia nitrogen wastewater is stripped in the ammonia still, the mixture of ammonia steam and water steam is discharged from a steam outlet at the top of the ammonia still and enters a shell-and-tube condenser at the top of the ammonia still to be condensed to recycle the ammonia water, and the produced ammonia water is reused for production. The ammonia water has volatility, the solubility of the ammonia in the water is rapidly reduced along with the temperature rise, the traditional shell-and-tube condenser at the top of the ammonia still can only condense part of mixed vapor of the ammonia water, condensed liquid ammonia water and uncondensed ammonia-containing gas respectively flow out through different outlets, and different treatments are respectively carried out in the subsequent process.

Chinese patent CN203772049U relates to an ammonia still tower top of tower shell and tube condenser, and this utility model is equipped with the baffling board in the well casing, the baffling board is perpendicular with the casing axis, and staggered arrangement from top to bottom, heat exchange efficiency is higher, and the condensation effect is better, and liquid ammonia that is condensed and the ammonia-containing gas that is not condensed flow through different exports respectively, carry out different processing in follow-up technology respectively.

The utility model has the following disadvantages:

firstly, most ammonia steam is condensed into high-temperature ammonia water after the ammonia steam enters the shell-and-tube condenser from the air inlet, the high-temperature ammonia water is not further cooled, the ammonia water has stronger volatility, and the solubility of ammonia in water is rapidly reduced along with the temperature rise, so a large amount of ammonia-containing gas which is not condensed is still output from the air outlet and needs to enter a subsequent process flow for secondary condensation or absorption, and meanwhile, the condensed high-temperature liquid ammonia water also needs to be further cooled and stored through subsequent equipment such as a plate heat exchanger from the liquid outlet, so that a plurality of process equipment are caused, and the project investment and the operation cost are high.

Second, because of the ammonia vapor tolerance is big, the air inlet diameter is big, and this utility model top can not the cloth area under control (see fig. 1) in order to guarantee that steam can get into equipment smoothly, so can cloth the heat exchange tube region less, and heat transfer area reduces, and because of shell and tube condenser upper portion space does not arrange the heat exchange tube, forms the heat transfer blind spot, and a large amount of ammonia vapor do not carry out baffling heat transfer and directly lead to the gas outlet from the top circulation clearance and discharge, reduce this shell and tube condenser heat exchange efficiency.

Third, with the second, because of the big air inlet diameter of ammonia vapor volume is big (generally reaches equipment diameter 40%), so the shown first baffling board of this utility model is far away from the import side tube sheet, and ammonia vapor gets into first baffling board breach department fast promptly after the shell and tube condenser, is close to the tube sheet side and easily forms the heat transfer blind spot, reduces heat exchange efficiency.

Fourth, after ammonia steam got into shell and tube condenser, along with gaseous state steam condensation becomes liquid aqueous ammonia, the volume progressively reduces, and this utility model well baffling board equidistance is arranged, and baffling board quantity is less, and the steam runner is shorter, and the gas velocity of flow is unstable, appears the heat transfer blind spot easily, reduces heat exchange efficiency.

Fifthly, the baffle plates arranged up and down are easy to cause liquid level control during condensation, and the liquid level at the local position of the bottom is too high to cause vapor-water flushing, so that the heat exchange tube is broken or damaged, and safety accidents are caused; in addition, the steam baffled up and down influences the descending of condensate on the wall of the heat exchange tube.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is to overcome the not enough that prior art exists, provide an ammonia still top of the tower shell and tube condenser.

For solving the technical problem, the utility model discloses an ammonia still top of tower shell and tube formula condenser, including front end pipe case, front end tube sheet, buffer tube, shell side barrel, rear end tube sheet and rear end tube case, one side and the front end tube case of front end tube sheet are connected, and the opposite side is connected with the one end of buffer tube, the one end clearance of shell side barrel inserts in the other end of buffer tube, one side and the other end of shell side barrel of rear end tube sheet are connected, the opposite side with the rear end tube case is connected, be provided with the branch journey baffle in the front end tube case, the last downside of branch journey baffle is equipped with cooling water outlet and cooling water import, be provided with the ammonia steam import on the buffer tube, the top of the other end of shell side barrel is provided with the non-condensing export, and the bottom is equipped with the aqueous ammonia export, be provided with the both ends in the shell side barrel and connect respectively the heat exchange tube on front end tube sheet and the rear end tube sheet.

Further, one end of the shell-side cylinder extends towards the front-end tube plate, and the ammonia vapor inlet is positioned above the end part of the shell-side cylinder.

Furthermore, the front end tube box and the front end tube plate are detachably connected through a flange, and the rear end tube plate and the rear end tube box are detachably connected through a flange.

Furthermore, a plurality of baffle plates are distributed in the axial direction in the shell pass cylinder, and the heat exchange tubes penetrate through the baffle plates.

Further, the distance between adjacent baffles is gradually reduced along the flow direction of the ammonia vapor.

Furthermore, a baffle plate is arranged at the end part of the shell pass cylinder body, and the baffle plate is arranged close to the front end tube plate.

Furthermore, the baffle plates are provided with baffling gaps on the left side or the right side along the flowing direction of the ammonia steam, and the baffling gaps of the adjacent baffle plates are alternately arranged on the left side and the right side along the flowing direction of the ammonia steam.

Further, a liquid emptying port is arranged at the bottom of the rear end pipe box, and a gas emptying port is arranged at the top of the rear end pipe box.

Furthermore, a liquid drain port is formed in the bottom of the buffer cylinder.

Furthermore, saddle-type supports are arranged at the bottom of the buffer cylinder and the bottom of the shell pass cylinder.

Compared with the prior art, the utility model has the advantages of:

the utility model discloses a set up shell side barrel clearance male buffer cylinder to ammonia steam gets into the annular space between buffer cylinder and the shell side barrel by ammonia steam import, the problem that the heat exchange tube can not be covered with has been solved, the production in top heat transfer blind spot has been stopped, prevent the steam flow short circuit, therefore special construction simultaneously, but the baffling board of shell side barrel tip antedisplacement, but a baffling board is arranged more under the same space, the steam flow way has been increased, and the heat transfer blind spot that the front end probably appears has been eliminated, the efficiency of condensation has been improved.

Drawings

The accompanying drawings, which form a part of the specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:

FIG. 1 is a schematic diagram of a prior art condenser tube layout;

FIG. 2 is a schematic structural diagram of a shell-and-tube condenser at the top of an ammonia still tower disclosed by an embodiment of the utility model;

FIG. 3 is a schematic piping diagram of a shell-and-tube condenser at the top of an ammonia still according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of adjacent baffles according to an embodiment of the present invention.

Illustration of the drawings:

1. a front end channel box; 2. a split-range partition plate; 3. a cooling water inlet; 4. a cooling water outlet; 5. a buffer cylinder; 6. an ammonia vapor inlet; 7. a liquid drain port; 8. a baffling gap; 9. a shell-side cylinder; 10. a heat exchange pipe; 11. a baffle plate; 12. an outlet which is not condensed; 13. an ammonia water outlet; 14. a saddle support; 15. a front end tube sheet; 16. a rear tube sheet; 17. a gas exhaust port; 18. a rear end manifold box; 19. and (4) draining the liquid.

Detailed Description

In order to facilitate understanding of the present invention, the present invention will be described more fully and specifically with reference to the accompanying drawings and preferred embodiments, but the scope of the present invention is not limited to the following specific embodiments.

As shown in fig. 2-4, the embodiment of the utility model discloses ammonia still tower top shell and tube formula condenser, include from a left side to the front end pipe case 1 that the right side connects gradually, front end tube sheet 15, buffer tube 5, shell side barrel 9, rear end tube sheet 16 and rear end tube case 18, it is specific, flange and front end pipe case 1 detachable connection are passed through to one side of front end tube sheet 15, the opposite side is connected with buffer tube 5's one end, the one end clearance of shell side barrel 9 inserts in buffer tube 5's the other end, it is specific, the one end of shell side barrel 9 extends to front end tube sheet 15, ammonia steam inlet 6 is located the top of shell side barrel 9 tip, thereby, shell side barrel 9 tip is provided with baffling board 11, baffling board 11 is close to front end tube sheet 15 and sets up, thereby can arrange a baffling board 11 more. Thereby shell side barrel 9 and buffer tube 5 form an annular space structure, the other end detachable connection of flange and shell side barrel 9 is passed through equally to one side of rear end tube sheet 16, the opposite side is connected with rear end tube box 18, be provided with branch stroke baffle 2 in the front end tube box 1, thereby separate front end tube box 1 for upper and lower two cavities, the upper and lower side of branch stroke baffle 2 is equipped with cooling water outlet 4 and cooling water inlet 3, communicate with two upper and lower cavities of front end tube box 1 in proper order, be provided with ammonia steam inlet 6 on the buffer tube 5, the top of the other end of shell side barrel 9 is provided with non-condensing outlet 12, the bottom is equipped with aqueous ammonia export 13, be provided with the heat exchange tube 10 of both ends difference welded connection on front end tube sheet 15 and rear end tube sheet 16 in the shell side barrel 9. Thereby, through setting up shell side barrel 9 clearance male buffer cylinder 5, thereby ammonia steam gets into the annular space between buffer cylinder 5 and the shell side barrel 9 by ammonia steam import 6, the problem that the heat exchange tube 10 can not be covered with is solved, the production of top heat transfer blind spot has been stopped, prevent the steam flow short circuit, therefore particular structure simultaneously, the baffling board 11 of shell side barrel 9 tip can antedisplacement, can arrange a baffling board 11 more under the same space, the steam runner has been increased, and the heat transfer blind spot that the front end probably appears has been eliminated, the efficiency of condensation is improved.

In this embodiment, a plurality of baffles 11 are arranged in the axial direction in the shell-side cylinder 9, and the heat exchange tubes 10 are arranged through the baffles 11 and perpendicular to the axial direction of the shell-side cylinder 9. When provided, the baffles 11 are arranged at unequal intervals, and the distance between adjacent baffles 11 is gradually reduced along the flow direction of ammonia vapor. After the ammonia vapor enters the condenser, the volume is gradually reduced along with the condensation of the gaseous vapor into liquid ammonia water. According to the steam condensation speed, the unequal-distance baffle plates 11 are designed, the gas flow speed is more stable, heat exchange dead zones are not easy to occur, more baffle plates 11 can be distributed in the same space, the steam flow channel is longer, and the heat exchange efficiency is improved.

In the present embodiment, the baffle plates 11 are provided with baffle notches 8 on the left side or the right side in the flow direction of the ammonia vapor, and the baffle notches 8 of adjacent baffle plates 11 are alternately arranged on the left and right sides in the flow direction of the ammonia vapor. The baffle notches 8 are arranged left and right, so that stable baffle of air flow is facilitated, and the damping effect brought by relative up-down baffle is good; in addition, the process that the ammonia vapor is condensed and flows to the bottom of the shell along the pipe wall cannot be influenced by the direction of the airflow, and the left and right arrangement is suitable for the liquid phase to flow along the pushing direction of the airflow and is more suitable for the discharge of condensate. The baffle plate 11 can ensure that ammonia water forms a stable liquid level at the bottom of the shell pass cylinder 9 to soak the bottom heat exchange tube 10, so that the condensed ammonia water is further cooled, the ammonia water is greatly reduced to volatilize again, and only a small amount of non-condensable gas is discharged from a non-condensable gas outlet.

In this embodiment, the bottom of the rear end pipe box 18 is provided with a liquid emptying port 19, and the top is provided with a gas emptying port 17, so as to facilitate emptying of the liquid inside the rear end pipe box 18. Similarly, the bottom of the buffer cylinder 5 is provided with a liquid draining port 7, so that liquid in the annular space structure can be drained and cleaned conveniently.

In this embodiment, the saddle supports 14 are provided at the bottom of the buffer cylinder 5 and the bottom of the shell-side cylinder 9, thereby facilitating stable support and installation of the condenser.

The working principle of the utility model is as follows:

the circulating cooling water enters the bottom of the front end channel 1 from the cooling water inlet 3, flows to the rear end channel 18 through the lower heat exchange tubes 10, flows back to the top of the front end channel 1 from the upper heat exchange tubes 10, and is discharged out of the condenser through the cooling water outlet 4. In ammonia steam got into the annular space structure between buffer cylinder 5 and the shell side barrel 9 by ammonia steam inlet 6, the water conservancy diversion was followed to the baffling board 11 of shell side barrel 9 tip (this application is 1# -7# baffling board 11 from a left side to the right side in proper order), baffling about baffling board 11 through a plurality of equidistance arrangements not, passed through with recirculated cooling water heat exchange tube 10 conducts heat, and the condensation becomes the aqueous ammonia, because of baffling breach 8 that baffling board 11 set up in turn, the aqueous ammonia further cools off to low temperature in order to reduce volatilize once more, and through the air current drive, 13 discharge condensers from the aqueous ammonia export are followed smoothly to the aqueous ammonia, and a small amount of noncondensable gas is then discharged through noncondensable steam outlet 12.

Although the present invention has been described with reference to the preferred embodiments, it is not intended to limit the present invention. The technical solution of the present invention can be used by anyone skilled in the art to make many possible variations and modifications, or to modify equivalent embodiments, without departing from the scope of the technical solution of the present invention, using the technical content disclosed above. Therefore, any simple modification, equivalent change and modification made to the above embodiments by the technical entity of the present invention should fall within the protection scope of the technical solution of the present invention.

Claims (10)

1. The utility model provides an ammonia still tower top of tower shell and tube condenser, its characterized in that, includes front end pipe case (1), front end tube sheet (15), buffer tube (5), shell side barrel (9), rear end tube sheet (16) and rear end tube case (18), one side and front end tube case (1) of front end tube sheet (15) are connected, and the opposite side is connected with the one end of buffer tube (5), the one end clearance of shell side barrel (9) inserts in the other end of buffer tube (5), one side and the other end of shell side barrel (9) of rear end tube sheet (16) are connected, the opposite side with rear end tube case (18) are connected, be provided with branch journey baffle (2) in front end pipe case (1), the upper and lower side of branch journey baffle (2) is equipped with cooling water outlet (4) and cooling water inlet (3), be provided with ammonia steam inlet (6) on buffer tube (5), the top of the other end of shell side barrel (9) is provided with no steam condensation outlet (12), and the bottom is equipped with ammonia water outlet (13), be provided with two shell side tube sheets (9) respectively on heat exchange tube sheet (15) and rear end tube sheet (10).

2. The ammonia still tower overhead shell and tube condenser as claimed in claim 1, wherein one end of the shell-side tube (9) extends towards the front end tube sheet (15), and the ammonia vapor inlet (6) is located above the end of the shell-side tube (9).

3. An ammonia still tower overhead shell and tube condenser according to claim 2, characterized in that the front end tube box (1) and the front end tube plate (15) are detachably connected by a flange, and the rear end tube plate (16) and the rear end tube box (18) are detachably connected by a flange.

4. The ammonia still tower top shell-and-tube condenser according to any one of claims 1 to 3, characterized in that a plurality of baffle plates (11) are arranged in the axial direction in the shell-side cylinder (9), and the heat exchange tubes (10) are arranged through the baffle plates (11).

5. An ammonia still tower overhead shell-and-tube condenser as claimed in claim 4, characterized in that the distance between adjacent baffles (11) decreases stepwise along the flow direction of ammonia vapor.

6. An ammonia still tower overhead shell-and-tube condenser as claimed in claim 4, characterized in that the end of the shell-side cylinder (9) is provided with a baffle plate (11), the baffle plate (11) being arranged close to the front-end tube plate (15).

7. The ammonia still tower top shell-and-tube condenser of claim 4, characterized in that the baffle plates (11) are provided with baffle notches (8) on the left side or the right side along the flowing direction of ammonia vapor, and the baffle notches (8) of the adjacent baffle plates (11) are alternately arranged on the left side and the right side along the flowing direction of the ammonia vapor.

8. The ammonia still tower overhead shell-and-tube condenser of claim 4, characterized in that the bottom of the back end tube box (18) is provided with a liquid drain (19) and the top is provided with a gas drain (17).

9. The ammonia still tower top shell-and-tube condenser according to claim 4, characterized in that the bottom of the buffer vessel (5) is provided with a liquid drain (7).

10. The ammonia still tower top shell-and-tube condenser according to claim 4, characterized in that the bottom of the buffer cylinder (5) and the bottom of the shell side cylinder (9) are provided with saddle supports (14).

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