CN212017319U

CN212017319U - Urea washing tower

Info

Publication number: CN212017319U
Application number: CN202020633486.3U
Authority: CN
Inventors: 张文; 孙爱荣; 李俊松
Original assignee: Hubei Changfa Vessel Manufacturing Co ltd
Current assignee: Hubei Changfa Vessel Manufacturing Co ltd
Priority date: 2020-04-24
Filing date: 2020-04-24
Publication date: 2020-11-27
Anticipated expiration: 2030-04-24

Abstract

The utility model provides a urea washing tower, it includes the body of the tower to and set up the first heat exchange assemblies in the body of the tower, and be located the second heat exchange assemblies of first heat exchange assemblies top, first heat exchange assemblies and second heat exchange assemblies are connected through the concurrent heating subassembly that sets up outside the body of the tower, and wherein first heat exchange assemblies include the spiral pipe that sets up with the axial lead with the body of the tower, and the lower extreme of spiral pipe and the feed liquor pipe intercommunication of fixed connection on the body of the tower outer wall, upper end and concurrent heating subassembly intercommunication. The utility model discloses set up the concurrent heating subassembly between heating element (first and second heat exchange assemblies), carry out the heat compensation through the concurrent heating subassembly to the temperature that reduces behind first heat exchange assembly, get into the second heat exchange assembly again after the temperature risees and carry out follow-up heat transfer, set up like this and make heat transfer temperature can keep at higher level under the normal prerequisite of assurance heat transfer process, and then guarantee the normal clear of continuous heating.

Description

Urea washing tower

Technical Field

The utility model relates to a urea production facility technical field especially relates to a urea scrubbing tower.

Background

Melamine is an important material for the production of urea. The low-pressure melamine production process is widely applied in China due to less investment and short manufacturing period. In the production of melamine by a low-pressure method, a urea washing tower is seven important core devices, and whether the heating temperature of the urea washing tower can be continuously heated directly influences the purity of finished products, the service life of a catalyst, the utilization rate of urea, the energy consumption cost and the labor intensity of workers in the production of melamine by the low-pressure method.

In the prior art, a washing tower is heated by adopting a heat exchange tube, and in the heating process, because the tube pass (namely the heat exchange process) is generally longer, the temperature is reduced to a lower level in the rear section, so that the continuous heating is not facilitated.

SUMMERY OF THE UTILITY MODEL

To the not enough that exists among the prior art, utility model provides a urea scrubbing tower, it has solved the longer problem that is unfavorable for continuous heating of heat exchange tube among the prior art because of the tube side.

According to the embodiment of the utility model, a urea scrubbing tower, it includes the body of the tower to and set up the first heat transfer subassembly in the body of the tower, and be located the second heat transfer subassembly of first heat transfer subassembly top, first heat transfer subassembly and second heat transfer subassembly are connected through the concurrent heating subassembly that sets up outside the body of the tower, and wherein first heat transfer subassembly includes the spiral pipe that sets up with the axial lead with the body of the tower, and the lower extreme of spiral pipe and the feed liquor pipe intercommunication of fixed connection on the body of the tower outer wall, upper end and concurrent heating subassembly intercommunication.

In the technical scheme, a heating medium (such as high-temperature water) enters the first heat exchange assembly from the liquid inlet pipe, enters the heat supplementing assembly outside the tower body after heat exchange to be heated again to raise the temperature, then enters the second heat exchange assembly inside the tower body again to exchange heat again, and finally is led out of the tower body; heating medium carries out the heat transfer through first heat exchange assembly and second heat exchange assembly and material in order to realize the purpose of heating the material, sets up concurrent heating subassembly simultaneously, compensates the temperature that reduces the part in heat transfer process middle section for the heat transfer normally goes on.

Compared with the prior art, the utility model discloses following beneficial effect has:

the heat supplementing assembly is arranged between the heating assembly (the first heat exchange assembly and the second heat exchange assembly), heat compensation is carried out on the temperature reduced after passing through the first heat exchange assembly through the heat supplementing assembly, the temperature is increased and then enters the second heat exchange assembly again to carry out subsequent heat exchange, and the heat exchange temperature can be kept at a higher level on the premise of ensuring the normal heat exchange process, so that the normal continuous heating is ensured.

Drawings

Fig. 1 is a schematic diagram of the general structure of an embodiment of the present invention (downward arrows indicate material flow direction, and left and right arrows indicate flow direction of heat exchange medium);

fig. 2 is a schematic view of an upper orifice plate mounting structure according to an embodiment of the present invention;

fig. 3 is a schematic view of a lower orifice plate mounting structure according to an embodiment of the present invention;

fig. 4 is a schematic structural view of a riser according to an embodiment of the present invention;

in the above drawings: the tower body 1, spiral pipe 2, feed liquor pipe 3, bracing piece 4, go up orifice plate 5, orifice plate 6, riser 7, first pipeline 8, second pipeline 9, third pipeline 10, drain pipe 11, go up T venturi tube 12, lower T venturi tube 13, standpipe 14, electric heater 15, sand grip 16 down.

Detailed Description

The technical solution of the present invention will be further explained with reference to the accompanying drawings and embodiments.

As shown in FIGS. 1-4, this embodiment provides a urea washing tower, it includes body of the tower 1, and set up the first heat exchange assembly in body of the tower 1, and be located the second heat exchange assembly of first heat exchange assembly top, first heat exchange assembly and second heat exchange assembly are connected through the concurrent heating subassembly that sets up outside body of the tower 1, wherein first heat exchange assembly includes the spiral pipe 2 that sets up with the axial lead with body of the tower 1, and the lower extreme of spiral pipe 2 and the feed liquor pipe 3 intercommunication of fixed connection on body of the tower 1 outer wall, the upper end and concurrent heating subassembly intercommunication.

In the above embodiment, the material enters the tower from the top of the tower, exchanges heat with the second heat exchange assembly, then exchanges heat with the first heat exchange assembly, the heating medium (such as high-temperature water) enters the first heat exchange assembly from the liquid inlet pipe 3, enters the heat supplementing assembly outside the tower body 1 after heat exchange to be reheated and raised in temperature, then enters the second heat exchange assembly inside the tower body 1 again to exchange heat again, and finally is led out of the tower body 1; the heating medium exchanges heat with the material through the first heat exchange assembly and the second heat exchange assembly to achieve the purpose of heating the material, and meanwhile, the heat supplementing assembly is arranged to compensate the temperature of the reduced part in the middle section of the heat exchange process so that the heat exchange is normally carried out;

in the scrubbing tower that this embodiment provided, set up the concurrent heating subassembly between heating element (first and second heat exchange assemblies), carry out heat compensation through the concurrent heating subassembly to the temperature that reduces behind first heat exchange assembly, reentrant second heat exchange assembly carries out follow-up heat transfer after the temperature risees, sets up like this and makes heat transfer temperature can keep at higher level under the normal prerequisite of assurance heat transfer process, and then guarantees the normal clear of continuous heating.

Preferably, in order to improve the stability of the spiral tube 2 in the tower body 1, the first heat exchange assembly further comprises a plurality of support rods 4 fixedly connected to the inner wall of the tower body 1, and one ends of the support rods 4, far away from the tower body 1, are connected with the spiral tube 2 fixing rods.

Preferably, the second heat exchange assembly comprises an upper orifice plate 5 fixedly connected with the inner wall of the tower body 1, a lower orifice plate 6 positioned below the upper orifice plate 5, and a plurality of vertical plates 7 arranged between the upper orifice plate 5 and the lower orifice plate 6, pipeline systems communicated with the heat supplementing assembly and communicated with a liquid outlet pipe 11 fixedly connected with the outer wall of the tower body 1 are further arranged in the upper orifice plate 5, the vertical plates 7 and the lower orifice plate 6, wherein the orifices on the upper orifice plate 5 and the lower orifice plate 6 are used for materials to pass through the tower body 1,

particularly, in order not to influence the installation of the vertical plates 7, the holes in the upper hole plate 5 or the lower hole plate 6 are arranged between the two adjacent vertical plates 7, so that the materials can be ensured to smoothly enter the vertical plates 7 to exchange heat with a heat exchange medium in a larger area.

Preferably, the pipe-line system is including setting up in the last orifice plate 5 and with first pipeline 8, the setting of concurrent heating subassembly intercommunication are in each a plurality of second pipelines 9 in the riser 7 and setting are in the orifice plate 6 down and with the third pipeline 10 of drain pipe 11 intercommunication, wherein, first pipeline 8 communicates with the upper end of all second pipelines 9, and third pipeline 10 communicates with the lower extreme of all second pipelines 9, and heat transfer medium gets into first pipeline 8 after the concurrent heating, gets into second pipeline 9 and gets into the material between the riser 7 through first pipeline 8 and carries out the heat transfer of bigger area, then gets into third pipeline 10, finally exports body 1 through drain pipe 11.

Preferably, in order to make the second pipeline 9 cover the whole riser 7, the second pipeline 9 comprises an upper T-shaped pipe 12 communicated with the first pipeline 8, a lower T-shaped pipe 13 communicated with the third pipeline 10 and a plurality of vertical pipes 14 respectively communicated with the upper T-shaped pipe 12 and the lower T-shaped pipe 13, so that a heat exchange medium flows in the whole riser 7, and the heat exchange is more efficiently carried out.

Preferably, the heat supplementing assembly comprises an electric heater 15, the electric heater 15 is provided with an inlet pipe communicated with the upper end of the spiral pipe 2 and an outlet pipe communicated with the first pipeline 8, and a heat exchange medium with a reduced temperature after passing through the spiral pipe 2 is heated in the electric heater 15 and then enters the second heat exchange assembly again for heat exchange.

Preferably, be provided with the sand grip 16 that the cross-section is triangle-shaped on the last face of last orifice plate 5, and sand grip 16 is located directly over first pipeline 8, the sand grip 16 of setting can be shunted to both sides fast with the material that falls to this department, guarantees that the material passes last orifice plate 5 fast.

Finally, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the present invention can be modified or replaced by other means without departing from the spirit and scope of the present invention, which should be construed as limited only by the appended claims.

Claims

1. The utility model provides a urea scrubbing tower which characterized in that, includes the body of the tower to and set up the first heat exchange assemblies in the body of the tower, and be located the second heat exchange assemblies of first heat exchange assemblies top, first heat exchange assemblies and second heat exchange assemblies are connected through the concurrent heating subassembly that sets up outside the body of the tower, and wherein first heat exchange assemblies include the spiral pipe that sets up with the body of the tower coaxial line, and the lower extreme and the feed liquor pipe intercommunication of fixed connection on the body of the tower outer wall of spiral pipe, upper end and concurrent heating subassembly intercommunication.

2. The urea washing tower of claim 1, wherein the first heat exchange assembly further comprises a plurality of support rods fixedly connected to the inner wall of the tower body, and ends of the support rods, which are far away from the tower body, are connected to the spiral tube fixing rods.

3. The urea washing tower of claim 2, wherein the second heat exchange assembly comprises an upper perforated plate fixedly connected with the inner wall of the tower body, a lower perforated plate positioned below the upper perforated plate, and a plurality of risers arranged between the upper perforated plate and the lower perforated plate, and a pipeline system communicated with the heat replenishing assembly and the liquid outlet pipe fixedly connected with the outer wall of the tower body is further arranged in the upper perforated plate, the risers and the lower perforated plate.

4. A urea scrubber according to claim 3, wherein the piping system comprises a first pipe disposed in the upper perforated plate and communicating with the thermal subassembly, a second pipe disposed in each of the risers, and a third pipe disposed in the lower perforated plate and communicating with the effluent pipe, wherein the first pipe communicates with upper ends of all of the second pipes, and the third pipe communicates with lower ends of all of the second pipes.

5. A urea scrubber according to claim 4, wherein the supplementary heating unit comprises an electric heater having an inlet pipe communicating with the upper end of the spiral pipe and an outlet pipe communicating with the first pipe.

6. The urea washing tower of claim 5, wherein the upper plate surface of the upper orifice plate is provided with a convex strip with a triangular cross section, and the convex strip is positioned right above the first pipeline.

7. A urea scrubber according to any one of claims 3-6, wherein the holes in the upper perforated plate or the lower perforated plate are each provided between two adjacent risers.

8. A urea scrubber according to claim 4, wherein the second conduit comprises an upper T-pipe communicating with the first conduit and a lower T-pipe communicating with the third conduit, and a plurality of standpipes communicating with both the upper T-pipe and the lower T-pipe, respectively.