CN212998423U - Stable and efficient urea evaporation system - Google Patents
Stable and efficient urea evaporation system Download PDFInfo
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- CN212998423U CN212998423U CN202021349934.3U CN202021349934U CN212998423U CN 212998423 U CN212998423 U CN 212998423U CN 202021349934 U CN202021349934 U CN 202021349934U CN 212998423 U CN212998423 U CN 212998423U
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Abstract
The utility model relates to a stabilize efficient urea vaporization system, including one section evaporation heater, one section evaporation heater links to each other from top to bottom with one section evaporative separator, and one section evaporative separator goes out the liquid and passes through U type pipe and two-stage process evaporation heater's bottom feed inlet intercommunication, two-stage process evaporation heater top discharge mouth and two-stage process evaporation separator intercommunication, one section evaporation heater and two-stage process evaporation heater's shell side is equipped with the steam admission pipe, two-stage process evaporation separator liquid outlet passes through urea melting pump sending to follow-up granulation workshop section. The utility model provides a urea evaporation system steam utilization rate is high, evaporation efficiency is high, two-stage process evaporation separator washing effect is good, and it can prevent effectively that two-stage process evaporation separator top from accumulating biuret the most important, avoids influencing the bad phenomenon of production because of the biuret scar piece drops, guarantees the stable high-efficient operation of urea evaporation system.
Description
Technical Field
The utility model belongs to chemical production chemical fertilizer trade field relates to urea apparatus for producing, concretely relates to stabilize efficient urea vaporization system.
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, conventional vaporization systems have certain disadvantages in the actual production process. Firstly, the failure rate is relatively high, which is mainly reflected in that a biuret scar block falls from a two-stage evaporation separator to block a filter screen of an inlet filter of a urea melting pump, so that the pump is evacuated, an evaporation system is forced to circularly treat failures, and the condition of this kind of failure occurs many times every year, thereby seriously affecting the equipment utilization rate and the production efficiency and increasing the process operation and the labor intensity; and secondly, the condensate is discharged by the steam trap on the shell pass of the first-stage evaporation heater and the second-stage evaporation heater, the secondary line valve is arranged to be normally opened, steam is wasted when the process fluctuates, and the operability is low, so that the heat exchange efficiency is difficult to ensure.
Disclosure of Invention
The utility model provides a technical problem provide a stable efficient urea evaporation system, can in time wash the biuret at two-stage process evaporation separator top, prevent to accumulate and form the scar piece to avoid the scar piece to cause the influence to follow-up pipeline and equipment, guarantee evaporation system's steady operation, guarantee equipment utilization and production efficiency, reduce technology operation and intensity of labour. And the steam condensate can be prevented from being accumulated on the shell sides of the first-stage evaporation heater and the second-stage evaporation heater, and the heat exchange efficiency and the steam utilization rate are ensured.
The utility model adopts the technical proposal that:
the utility model provides a stable efficient urea vaporization system, includes one section evaporation heater, one section evaporation heater links to each other from top to bottom with one section evaporation separator, and one section evaporation separator goes out the liquid and communicates through U type pipe and two-stage evaporation heater's bottom feed inlet, and two-stage evaporation heater top discharge gate and two-stage evaporation separator communicate, one section evaporation heater and two-stage evaporation heater's shell side are equipped with the steam admission pipe, two-stage evaporation separator liquid outlet is through urea melting pump sending to follow-up granulation workshop section.
Preferably, the first-stage evaporation heater is a falling film evaporator, a feed pipe of the first-stage evaporation heater is positioned in the first-stage evaporation heater and is provided with a nozzle, and a filler is arranged below the nozzle. Realizing the uniform distribution of the urea solution.
Further preferably, the nozzle is a solid conical nozzle.
Preferably, the shell sides of the first-section evaporation heater and the second-section evaporation heater are respectively communicated with the first-section evaporation heater liquid level tank and the second-section evaporation heater liquid level tank, the top steam outlet of the first-section evaporation heater liquid level tank and the top steam outlet of the second-section evaporation heater liquid level tank are respectively communicated with the shell sides of the first-section evaporation heater and the second-section evaporation heater, and the bottoms of the first-section evaporation heater liquid level tank and the second-section evaporation heater liquid level tank are provided with steam condensate outlet. And the steam condensate is prevented from being accumulated on the shell side of the heater, and the heating effect is ensured.
Preferably, a liquid baffle plate is arranged in the two-section evaporation separator and right above the two-section evaporation heater, the liquid baffle plate is made of 2205 dual-phase steel and is resistant to urea solution scouring corrosion.
Preferably, the outlet of the urea melting pump is provided with a branch pipe which is connected to a washing spray head at the top of the two-stage evaporation separator for communication.
Further preferably, the washing nozzles are uniformly distributed along the circumference of the upper head of the two-stage evaporation separator, and the number of the washing nozzles is multiple. The range of the adjacent spraying sectors has no dead angle. Molten urea is adopted as flushing liquid, and the biuret has relatively high solubility in the molten urea, so that the flushing effect is ensured.
Preferably, the first-stage evaporation heater, the first-stage evaporation separator, the U-shaped pipe, the second-stage evaporation heater, the second-stage evaporation separator and the liquid outlet and flushing pipelines thereof are heated by adopting steam accompanying pipes. Preventing crystallization.
Preferably, the liquid baffle in the two-stage evaporation separator is made of 2205 dual-phase steel and is resistant to the erosion corrosion of the urea solution.
Preferably, a gas phase discharge port is arranged above the first-stage evaporation separator and the second-stage evaporation separator.
The utility model discloses beneficial effect: the method comprises the following steps of (1) completely feeding condensate on the shell side of a heater into a liquid level tank for flash evaporation, vapor-liquid separation by utilizing the level difference between the liquid level tank of the heater and the heater, continuously heating the vapor, discharging the condensate to subsequent equipment, and completely filling the shell side of the heater with the vapor without discharging the vapor out of a system; the molten urea is utilized to wash the part which is easy to scar at the top of the two-section evaporation separator, so that the solubility of the biuret in the molten urea is relatively higher, and the washing effect is ensured. The utility model provides a low and poor problem of heat exchange efficiency of evaporation system steam utilization ratio among the fertilizer trade urea production device, still prevented two-stage evaporation separator internal shrinkage biuret scar piece's formation, avoided two-stage evaporation separator to drop the biuret scar piece and made the urea melting pump evacuate and then lead to evaporation system to be forced to beat the bad phenomenon of circulation processing trouble.
Therefore, adopt the utility model provides a stable efficient urea evaporation system is very necessary, and its steam utilization rate is high, evaporation efficiency is high, two-stage process evaporation separator washing effect is good, and it can effectively prevent two-stage process evaporation separator top from depositing biuret, avoids influencing the bad phenomenon of production because of the biuret scar piece drops, guarantees urea evaporation system and stabilizes high-efficient operation, guarantees equipment utilization and production efficiency, reduces technology operation and intensity of labour.
Drawings
FIG. 1 is a schematic view of the system of the present invention;
wherein: the device comprises a first-section evaporation heater 1, a solid cone spray head 1-1, a filler 1-2, a first-section evaporation separator 2, a first-section evaporation heater liquid level tank 3, a second-section evaporation separator 4, a flushing spray head 4-1, a liquid baffle plate 4-2, a second-section evaporation heater 5, a second-section evaporation heater liquid level tank 6, a urea melting pump 7, a U-shaped pipe 8 and a steam accompanying pipe 9.
Detailed Description
The invention is further described with reference to the following examples, but the scope of the invention as claimed is not limited to the scope of the examples.
Example 1
The utility model provides a stable efficient urea vaporization system, includes one section evaporation heater 1, one section evaporation heater 1 links to each other from top to bottom with one section evaporation separator 2, and one section evaporation separator 2 goes out the liquid and communicates with the bottom feed inlet of two-stage evaporation heater 5 through U type pipe 8, and 5 top discharge gates of two-stage evaporation heater communicate with two-stage evaporation separator 4, the shell side of one section evaporation heater 1 and two-stage evaporation heater 5 is equipped with the steam admission pipe, 4 liquid outlets of two-stage evaporation separator pass through urea melting pump 7 and send follow-up granulation workshop section.
Preferably, the first-stage evaporation heater 1 is a falling film evaporator, the feeding pipe of the first-stage evaporation heater 1 is arranged inside the first-stage evaporation heater 1 and provided with a nozzle 1-1, and a filler 1-2 is arranged below the nozzle 1-1. Realizing the uniform distribution of the urea solution.
Further preferably, the nozzle 1-1 is a solid conical nozzle.
Preferably, the shell sides of the first-section evaporation heater 1 and the second-section evaporation heater 5 are respectively communicated with the first-section evaporation heater liquid level tank 3 and the second-section evaporation heater liquid level tank 6, the top steam outlet of the first-section evaporation heater liquid level tank 3 and the second-section evaporation heater liquid level tank 6 is respectively communicated with the shell sides of the first-section evaporation heater 1 and the second-section evaporation heater 5, and the bottoms of the first-section evaporation heater liquid level tank 3 and the second-section evaporation heater liquid level tank 6 are provided with steam condensate outlet. And the steam condensate is prevented from being accumulated on the shell side of the heater, and the heating effect is ensured.
Preferably, a liquid baffle plate 4-2 is arranged in the two-stage evaporation separator 4 and right above the two-stage evaporation heater 5, and the liquid baffle plate 4-2 is made of 2205 dual-phase steel and is resistant to urea solution erosion corrosion.
Preferably, the outlet of the urea melting pump 7 is provided with a branch pipe which is connected to the washing nozzle 4-1 at the top of the two-stage evaporation separator 4 for communication.
Further preferably, the washing nozzles 4-1 are uniformly distributed along the circumference of the upper head of the two-stage evaporation separator 4, and a plurality of washing nozzles 4-1 are provided. The range of the adjacent spraying sectors has no dead angle. Molten urea is adopted as flushing liquid, and the biuret has relatively high solubility in the molten urea, so that the flushing effect is ensured.
Preferably, the first-stage evaporation heater 1, the first-stage evaporation separator 2, the U-shaped pipe 8, the second-stage evaporation heater 5, the second-stage evaporation separator 4 and the liquid outlet and flushing pipelines thereof are heated by adopting a steam accompanying pipe 9. Preventing crystallization.
Preferably, a gas phase discharge port is arranged above the first-stage evaporation separator 2 and the second-stage evaporation separator 4.
The utility model discloses a working process does: in the operation process of the urea device, 75-80% of urea solution in the urine storage tank enters a first-stage evaporation and a second-stage evaporation for concentration, the urea solution exchanges heat with steam on the shell side of a heater, the generated steam condensate enters a heater liquid level tank due to gravity flow, so that the shell side of the heater is filled with the steam, the steam generated after the steam-liquid separation in the liquid level tank enters the shell side of the heater again, the steam condensate is discharged outside, and the liquid level in the liquid level tank is ensured; the concentrated urea melt liquid is sent to a subsequent granulation working section by a pump, and meanwhile, a small flow of urea melt liquid continuously washes the top of the two-section evaporation separator through the branch pipe and the washing nozzle, so that the biuret is prevented from accumulating and scabbing. Therefore, the heat exchange efficiency of the urea evaporation system can be improved to a certain extent, and more importantly, the stable operation of the urea evaporation system can be ensured.
The above-mentioned embodiments only represent the preferred embodiments of the present invention, and the description thereof is more specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, various changes, modifications and substitutions can be made without departing from the spirit of the invention, and these are all within the scope of the invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (9)
1. A stable and efficient urea evaporation system comprises a section of evaporation heater (1), and is characterized in that: the device is characterized in that the first-section evaporation heater (1) is connected with the first-section evaporation separator (2) from top to bottom, the liquid outlet of the first-section evaporation separator (2) is communicated with the bottom feed inlet of the second-section evaporation heater (5) through a U-shaped pipe (8), the top discharge outlet of the second-section evaporation heater (5) is communicated with the second-section evaporation separator (4), the shell sides of the first-section evaporation heater (1) and the second-section evaporation heater (5) are provided with steam inlet pipes, and the liquid outlet of the second-section evaporation separator (4) is conveyed to a subsequent granulation section through a urea melting pump (7).
2. A stable and efficient urea evaporation system according to claim 1, wherein: the first-stage evaporation heater (1) is a falling film evaporator, a feeding pipe of the first-stage evaporation heater (1) is positioned in the first-stage evaporation heater (1) and is provided with a nozzle (1-1), and a filler (1-2) is arranged below the nozzle (1-1).
3. A stable and efficient urea evaporation system according to claim 2, wherein: the nozzle (1-1) is a solid conical nozzle.
4. A stable and efficient urea evaporation system according to claim 1, wherein: the shell passes of the first section of the evaporation heater (1) and the second section of the evaporation heater (5) are respectively communicated with the first section of the evaporation heater liquid level tank (3) and the second section of the evaporation heater liquid level tank (6), the top steam outlet of the first section of the evaporation heater liquid level tank (3) and the second section of the evaporation heater liquid level tank (6) is respectively communicated with the shell passes of the first section of the evaporation heater (1) and the second section of the evaporation heater (5), and the bottoms of the first section of the evaporation heater liquid level tank (3) and the second section of the evaporation heater liquid level tank (6) are provided with steam condensate outlet ports.
5. A stable and efficient urea evaporation system according to claim 1, wherein: a liquid baffle plate (4-2) is arranged in the two-section evaporation separator (4) and right above the two-section evaporation heater (5), and the liquid baffle plate (4-2) is made of 2205 dual-phase steel.
6. A stable and efficient urea evaporation system according to claim 1, wherein: the outlet of the urea melting pump (7) is provided with a branch pipe which is connected to a washing nozzle (4-1) at the top of the two-section evaporation separator (4) for communication.
7. The stable and efficient urea evaporation system of claim 6, wherein: the washing nozzles (4-1) are uniformly distributed along the circumference of the upper end enclosure of the two-section evaporation separator (4), and a plurality of washing nozzles (4-1) are arranged.
8. A stable and efficient urea evaporation system according to claim 1, wherein: the first-stage evaporation heater (1), the first-stage evaporation separator (2), the U-shaped pipe (8), the second-stage evaporation heater (5), the second-stage evaporation separator (4) and liquid outlet and flushing pipelines thereof are heated by a steam accompanying pipe (9).
9. A stable and efficient urea evaporation system according to claim 1, wherein: a gas phase outlet is arranged above the first-stage evaporation separator (2) and the second-stage evaporation separator (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021349934.3U CN212998423U (en) | 2020-07-10 | 2020-07-10 | Stable and efficient urea evaporation system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021349934.3U CN212998423U (en) | 2020-07-10 | 2020-07-10 | Stable and efficient urea evaporation system |
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| CN212998423U true CN212998423U (en) | 2021-04-20 |
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| CN202021349934.3U Active CN212998423U (en) | 2020-07-10 | 2020-07-10 | Stable and efficient urea evaporation system |
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| CN (1) | CN212998423U (en) |
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- 2020-07-10 CN CN202021349934.3U patent/CN212998423U/en active Active
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