CN215462037U

CN215462037U - Urea evaporation system convenient to overhaul

Info

Publication number: CN215462037U
Application number: CN202121329568.XU
Authority: CN
Inventors: 沈永伦; 杨世立; 张力
Original assignee: Huaqiang Chemical Group Co Ltd
Current assignee: Huaqiang Chemical Group Co Ltd
Priority date: 2021-06-15
Filing date: 2021-06-15
Publication date: 2022-01-11
Anticipated expiration: 2031-06-15

Abstract

The utility model provides a urea evaporation system convenient to overhaul, which comprises a feed liquid tank, a first separator and a second separator, wherein the first separator and the second separator are respectively provided with a liquid phase inlet, a gas phase outlet and a liquid phase outlet, the liquid phase inlet of the first separator is connected with the feed liquid tank, and the liquid phase outlet of the first separator, the liquid phase inlet of the second separator and the feed liquid tank are connected through a first three-way valve. The utility model can effectively avoid the shutdown of the whole process due to maintenance, ensure the utilization rate of equipment, reduce redundant process operation, weaken labor intensity, reduce operation risk and improve production efficiency.

Description

Urea evaporation system convenient to overhaul

Technical Field

The utility model relates to the technical field of urea production equipment, in particular to a urea evaporation system convenient to overhaul.

Background

At present, urea production devices in the fertilizer industry all comprise evaporation, granulation, packaging, storage and transportation sections, urea solution with the concentration of 75-80% obtained through the previous section enters a urine storage tank, the urea solution is concentrated to about 99.8% through the urea evaporation section, and then the urea solution is sent to the granulation, packaging, storage and transportation sections. The urea evaporation section is divided into first-stage evaporation and second-stage evaporation, and the urine concentration can be increased to about 95% by the first-stage evaporation. However, in the actual production process, the evaporation system has to be temporarily stopped for various reasons such as leakage points, biuret scar blocks falling, no improvement of vacuum degree, failure of a urea melting pump, blockage of a filter screen of a first-stage evaporation filter, leakage points of pipeline elements and the like caused by corrosion and scouring of the two-stage evaporation separator, and the evaporation system is overhauled according to the phenomenon and is restarted after the overhaul is finished. Such a situation occurs at a high frequency, and causes the following problems: firstly, an evaporation system is stopped, so that the equipment utilization rate and the production efficiency are reduced; secondly, the frequency of starting and stopping the equipment and the frequency of starting and stopping an evaporation system are increased, so that the performance and the service life of the equipment are influenced; thirdly, the process operation is increased, the labor intensity is increased, and the safety risk is higher.

SUMMERY OF THE UTILITY MODEL

Aiming at the defects in the prior art, the utility model provides a urea evaporation system convenient to overhaul, which solves the problem that the evaporation system is frequently stopped in the prior art.

According to an embodiment of the utility model, the urea evaporation system convenient to overhaul comprises a feed liquid tank, a first separator and a second separator, wherein the first separator and the second separator are respectively provided with a liquid phase inlet, a gas phase outlet and a liquid phase outlet, the liquid phase inlet of the first separator is connected with the feed liquid tank, and the liquid phase outlet of the first separator, the liquid phase inlet of the second separator and the feed liquid tank are connected through a first three-way valve.

In the above embodiment, the feed liquid tank and the first separator constitute a first-stage evaporation, and the first separator and the second separator constitute a second-stage evaporation; specifically, the gaseous part leaves through the gaseous phase export of first separator, the liquid part material then gets into the second separator through the liquid phase import of second separator through the liquid phase export of first separator, the liquid phase export through the second separator gets into back end technology at last, twice evaporation separation has been realized at whole in-process, when one section evaporation goes wrong and need overhaul, break off first separator and directly communicate second separator and feed liquor tank through first three-way valve, guarantee production normal clear, overhaul one section evaporation without shut down.

Further, a U-shaped pipe is arranged between the first separator and the second separator, the U-shaped pipe comprises two sections connected with the first separator and the second separator respectively, and the first three-way valve is arranged on a section of the U-shaped pipe close to the first separator.

Furthermore, a second three-way valve is arranged on the U-shaped pipe and is close to one section of the second separator, and the second three-way valve is connected with the feed liquid tank.

Further, a first heater between the first separator and the feed liquid tank is fixedly connected to a liquid phase inlet of the first separator, and a second heater between the second separator and the second three-way valve is fixedly connected to a liquid phase inlet of the second separator.

Furthermore, the first heater and the second heater respectively comprise an upper mounting plate and a lower mounting plate which are arranged in a hollow manner, a plurality of tubes are arranged between the upper mounting plate and the lower mounting plate, and all the tubes are communicated with the upper mounting plate and the lower mounting plate; the upper mounting plate is also fixedly connected with a first connecting pipe, and the lower mounting plate is also fixedly connected with a second connecting pipe; go up the mounting panel with still fixedly connected with centers on all between the lower mounting panel the barrel outside the shell of tube, still be provided with import pipe and outlet pipe on the barrel.

Further, the inlet pipe is located at the upper end of the cylinder, and the outlet pipe is located at the lower end of the cylinder.

Further, the tube array is a spiral tube.

Further, a first melting pump is arranged between the first heater and the material liquid tank, a liquid phase outlet of the second separator is connected with a second melting pump, and a third melting pump is arranged between the second three-way valve and the material liquid tank.

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

the problem that the whole production is affected by shutdown during one-section evaporation maintenance is avoided, so that the equipment utilization rate is ensured, redundant process operation is reduced, the labor intensity is reduced, the operation risk is reduced, and the production efficiency is improved.

Drawings

FIG. 1 is a schematic diagram of the overall structure of an embodiment of the present invention;

fig. 2 is a schematic view of the internal structure of the first heater or the second heater according to the embodiment of the present invention;

in the above drawings:

1. a feed liquid tank; 2. a first separator; 3. a second separator; 4. a first three-way valve; 5. a U-shaped tube; 6. a second three-way valve; 7. a first melt pump; 8. a second melt pump; 9. a third melt pump; 10. a first heater; 11. a second heater; 12. an upper mounting plate; 13. a lower mounting plate; 14. arranging pipes; 15. a first connecting pipe; 16. a second connecting pipe; 17. a barrel; 18. an inlet pipe; 19. an outlet pipe.

Detailed Description

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

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the utility model and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the utility model.

As shown in fig. 1, the present embodiment provides a urea evaporation system convenient for maintenance, which includes a feed liquid tank 1, a first separator 2 and a second separator 3, wherein the first separator 2 and the second separator 3 are each provided with a liquid phase inlet, a gas phase outlet and a liquid phase outlet, the liquid phase inlet of the first separator 2 is connected to the feed liquid tank 1, and the liquid phase outlet of the first separator 2, the liquid phase inlet of the second separator 3 and the feed liquid tank 1 are connected by a first three-way valve 4.

In the above embodiment, the feed liquid tank 1 is filled with the urea solution to be treated, and the urea solution is introduced into the feed liquid tank 1 from the outside for storage; the feed liquid tank 1 and the first separator 2 form a first-stage evaporation, and the first separator 2 and the second separator 3 form a second-stage evaporation; specifically, the gas phase export that the gas part passes through first separator 2 leaves, the liquid part material then gets into second separator 3 through the liquid phase import of second separator 3 through the liquid phase export of first separator 2, get into back end technology through the liquid phase export of second separator 3 at last, twice evaporation separation has been realized at whole in-process, when one section evaporation goes wrong and needs to be overhauld, break off first separator 2 and directly communicate second separator 3 with feed liquid jar 1 through first three-way valve 4, guarantee production normal clear, the system does not shut down and can overhaul one section evaporation.

As shown in fig. 1, a U-shaped pipe 5 is disposed between the first separator 2 and the second separator 3, the U-shaped pipe 5 includes two sections connected to the first separator 2 and the second separator 3, respectively, and the first three-way valve 4 is disposed on a section of the U-shaped pipe 5 adjacent to the first separator 2. When the first three-way valve 4 is communicated with the first separator 2 and the second separator 3, the first three-way valve 4 is disconnected with the feed liquid tank 1, and first-stage evaporation and second-stage evaporation are carried out at the moment; when the first three-way valve 4 is communicated with the feed liquid tank 1 and the second separator 3, the first three-way valve 4 is disconnected with the first separator 2, the two-stage evaporation is carried out at the moment, and the one-stage evaporation can be overhauled.

As shown in fig. 1, in order to facilitate the maintenance of the two-stage evaporation, a second three-way valve 6 is further disposed on the U-shaped pipe 5 at a section thereof close to the second separator 3, and the second three-way valve 6 is further connected to the feed liquid tank 1. When two-stage process evaporation trouble, first three-way valve 4 disconnection first separator 2 and U-shaped pipe 5, second three-way valve 6 disconnection second separator 3 and U-shaped pipe 5 for the feed liquid does not evaporate and directly returns in the feed liquid jar 1, thereby realizes that the system shuts down the back and overhauls two-stage process evaporation, also can overhaul one section evaporation in step simultaneously, improves whole efficiency.

As shown in fig. 1, a first heater 10 is fixedly connected to the liquid phase inlet of the first separator 2 between the first heater and the feed liquid tank 1, and a second heater 11 is fixedly connected to the liquid phase inlet of the second separator 3 between the second heater and the second three-way valve 6. The first heater 10 and the second heater 11 are both heated by steam, the feed liquid is heated by the first heater 10 and then enters the first separator 2 for separation, the liquid-phase material enters the second heater 11 through the first three-way valve 4 and the second three-way valve 6 for reheating and then is sent into the second separator 3 for secondary separation, and finally the liquid-phase material is led out through the liquid-phase outlet of the second separator 3 and enters the back-end processing technology (namely, the granulation process section).

As shown in fig. 1, a first melting pump 7 is provided between the first heater 10 and the feed tank 1, a second melting pump 8 is connected to the liquid phase outlet of the second separator 3, and a third melting pump 9 is provided between the second three-way valve 6 and the feed tank 1. The first melting pump 7 is used for pumping the feed liquid in the feed liquid tank 1 into the first heater 10, the third melting pump 9 is used for pumping the feed liquid back into the feed liquid tank 1, and particularly, the third melting pump 9 can pump the liquid materials in the first separator 2 and the second separator 3 back into the feed liquid tank 1 by controlling the on-off conditions of the first three-way valve 4 and the second three-way valve 6, so that the material waste caused by shutdown maintenance is avoided; wherein the second melt pump 8 is used for pumping the feed liquid into the later stage of the processing process (i.e. the granulation process stage).

As shown in fig. 1 and 2, each of the first heater 10 and the second heater 11 includes an upper mounting plate 12 and a lower mounting plate 13, the upper mounting plate 12 and the lower mounting plate 13 are disposed with a plurality of tubes 14 therebetween, and all the tubes 14 are communicated with the upper mounting plate 12 and the lower mounting plate 13, wherein the tubes 14 are in a spiral structure; the upper mounting plate 12 is also fixedly connected with a first connecting pipe 15, the lower mounting plate 13 is also fixedly connected with a second connecting pipe 16, the first connecting pipe 15 is used for being connected with the first separator 2 or the second separator 3, the second connecting pipe 16 is used for guiding materials into the lower mounting plate 13, the materials enter the lower mounting plate 13 and then are divided into the tubes 14, and the materials are heated by steam and then flow into the upper mounting plate 12 to be further guided out through the first connecting pipe 15; a cylinder 17 surrounding all the tubes 14 is fixedly connected between the upper mounting plate 12 and the lower mounting plate 13, and an inlet pipe 18 and an outlet pipe 19 are arranged on the cylinder 17. During heating, steam for heating is introduced into the barrel 17 from the inlet pipe 18 and is in contact with the spiral shell and tube 14 to heat liquid (or liquid phase material) in the shell and tube 14, and the steam becomes condensed water after heating and is discharged from the outlet pipe 19, wherein the spiral structure is arranged to increase the flow (flowing distance) of the liquid material (including the liquid or liquid phase material) in the shell and tube 14, so that the contact time of the liquid material and the steam is prolonged, and a better heating effect is realized.

As shown in fig. 2, the inlet pipe 18 is located at the upper end of the cylinder 17, and the outlet pipe 19 is located at the lower end of the cylinder 17. That is, the steam enters the first heater 10 or the second heater 11 from above to heat the tubes 14, so that the condensed water can be more easily separated from the lower outlet tube 19, thereby ensuring normal and efficient heating.

Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, 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 modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.

Claims

1. The utility model provides a urea vaporization system convenient to overhaul, its characterized in that includes feed liquid jar, first separator and second separator, wherein first separator with the second separator all is provided with liquid phase import, gaseous phase export and liquid phase export, the liquid phase import of first separator with the feed liquid jar is connected, the liquid phase export of first separator, the liquid phase import of second separator and through first three-way valve connection between the feed liquid jar.

2. An easy-to-service urea evaporating system as set forth in claim 1, wherein a U-shaped pipe is provided between said first separator and said second separator, said U-shaped pipe comprising two sections connected to said first separator and said second separator, respectively, and wherein said first three-way valve is provided on a section of said U-shaped pipe adjacent to said first separator.

3. An easy-to-service urea evaporating system as set forth in claim 2, wherein said U-shaped pipe is further provided with a second three-way valve at a section thereof adjacent to said second separator, said second three-way valve being further connected to said feed liquid tank.

4. An easy-to-service urea evaporating system as set forth in claim 3, wherein said first separator has a first heater fixedly connected to a liquid phase inlet thereof between said first separator and said feed liquid tank, and said second separator has a second heater fixedly connected to a liquid phase inlet thereof between said second separator and said second three-way valve.

5. The easy-to-service urea evaporating system of claim 4, wherein the first heater and the second heater each comprise a hollow upper mounting plate and a hollow lower mounting plate, a plurality of tubes are arranged between the upper mounting plate and the lower mounting plate, and all the tubes are communicated with the upper mounting plate and the lower mounting plate; the upper mounting plate is also fixedly connected with a first connecting pipe, and the lower mounting plate is also fixedly connected with a second connecting pipe; go up the mounting panel with still fixedly connected with centers on all between the lower mounting panel the barrel outside the shell of tube, still be provided with import pipe and outlet pipe on the barrel.

6. An easy-to-service urea vaporization system as recited in claim 5, wherein said inlet pipe is located at an upper end of said barrel and said outlet pipe is located at a lower end of said barrel.

7. An easy-to-service urea vaporization system as recited in claim 6, wherein said tubes are helical tubes.

8. The urea evaporating system convenient for overhaul as claimed in claim 7, wherein a first melting pump is arranged between the first heater and the feed liquid tank, a second melting pump is connected to the liquid phase outlet of the second separator, and a third melting pump is arranged between the second three-way valve and the feed liquid tank.