CN1226283C - Vaporizing system vacuumizing method for urea production - Google Patents
Vaporizing system vacuumizing method for urea production Download PDFInfo
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- CN1226283C CN1226283C CN 200310110980 CN200310110980A CN1226283C CN 1226283 C CN1226283 C CN 1226283C CN 200310110980 CN200310110980 CN 200310110980 CN 200310110980 A CN200310110980 A CN 200310110980A CN 1226283 C CN1226283 C CN 1226283C
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- vacuum pumping
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Abstract
The present invention discloses a vacuum pumping method of a urea production and vaporization system. The method is characterized in that a closed cycle device formed by orderly connecting a pump, a liquid-gas injector and a circulation groove by pipelines is provided, and urea ammonium carbonate liquid is used as a circulation medium to carry out vacuum pumping to the urea vaporization system. The present invention has the advantages of low energy consumption, high vacuum degree, good effect, no emptying, ammonia recovery and no environmental pollution.
Description
Technical field
The invention belongs to process for producing urea, particularly the vacuum pumping method of Urea Evaporation System.
Background technology
At present, there is the urea production of wife and children more than 100 enterprise in the whole nation, all adopt the water solution total cycling method technology of universal design, its vapo(u)rization system vacuumizes and is to use 1.275Mp (definitely) middle pressure steam, spraying the formation negative pressure by evaporation ejector realizes vacuumizing, this Technology maturation, reliable, but need to consume a large amount of steam, energy consumption is very high.And, contain the direct emptying of ammonia steam after vacuumizing, not only do not reclaim the ammonia in the tail gas, also contaminate environment.
Therefore, the enterprise that has attempts by technological transformation without steam, and to cut down the consumption of energy, technical scheme is similar, all is to utilize the refrigeration cycle water evacuation.For example, Chinese patent disclosed " evaporation in a kind of urea production vacuumizes energy saver " (CN2441803Y), " a kind of vacuum pumping method that is used for aqueous solution gold circulation method antidiuresis element " (CN1236776A) etc.Its shortcoming is, utilizes the potentiometers potential of cooling circulating water to vacuumize, and pressure reduction is limited, and injector do not improve, have also without injector, so vacuum tightness is not high, effect is not fine; The more important thing is that the ammonia in the tail gas dissolves in recirculated water, can make all use the equipment of water coolant to be corroded, reduce work-ing life; Simultaneously, ammonia volatilization in the recirculated water has destroyed the Air quality of plant area; When recirculated water ammonia concentration was too big, discharging renewed again, can not reclaim ammonia, and contaminate environment is to lose more than gain again.So the enterprise that has stops using again, recover the original steam evacuation process, cause unnecessary loss.
Summary of the invention
Purpose of the present invention provides that a kind of energy consumption is low, vacuum tightness is high, effective, not emptying, can reclaim ammonia, Urea Evaporation System vacuum pumping method free from environmental pollution.Design concept is: be provided with one and drive, have the liquid medium closed cycle device of injector by pump, replace the steam vacuum extractor to vacuumize, reach the purpose that cuts down the consumption of energy; Use a kind of liquid ejector of special use, realize condition of high vacuum degree, high efficiency purpose; The top layer clear liquid that utilizes the urea ammonium fluid is as medium, and medium both circulated in the closed cycle device, again in urea ammonium fluid systemic circulation, reaches not emptying, reclaims ammonia, purpose free from environmental pollution.
Technical solution of the present invention is like this: a kind of urea production vapo(u)rization system vacuum pumping method, a closed cycle device that is formed by connecting in regular turn by pipeline by pump, liquid gas jet device, circulation groove is set, utilize the urea ammonium fluid to be circulatory mediator, Urea Evaporation System is vacuumized.
Described liquid gas jet device comprises air chamber and the one-level liquid gas mixing tube, secondary liquid gas mixing tube and the volume-expanding pressure-reducing Taper Pipe that are arranged on the same axis, the roof of air chamber is provided with liquid jet, wall is provided with gas feed, and one-level liquid gas mixing tube is located in the air chamber, and is corresponding with nozzle; Secondary liquid gas mixing tube and volume-expanding pressure-reducing Taper Pipe are end to end integral body, and secondary liquid gas mixing tube suitable for reading is located on the diapire of air chamber, and be corresponding with one-level liquid gas mixing tube.
Described liquid gas jet device is connected with intermediate condenser with one section vaporizer-condenser of Urea Evaporation System respectively with two parallel connections, its bleeding point.
Described circulation groove and urea ammonium fluid system connectivity, its import connects dual circulation condenser and evaporative condenser liquid pump, and outlet connects the evaporative condenser liquid bath.
Be in series with water cooler between the circulation groove of described closed cycle device and the pump.
Described closed cycle device is in parallel with the original steam vacuum extractor, can use wherein a kind of respectively by the valve switching; The relative original steam vacuum extractor of closed cycle device is installed in low level.
The invention has the beneficial effects as follows:
1. owing to use special-purpose liquid gas jet device, operting differential pressure is little, vacuum tightness is high, efficient is high.
2. owing to use pump to be power-equipment, institute power consumption source is more much lower than steam, can cut down the consumption of energy significantly.
3. because employing urea ammonium fluid is an ejection medium, the urea ammonium fluid circulates at native system, can all reclaim the ammonia in the tail gas.
Since medium at system's internal recycle, not emptying is not polluted, environmental benefit is outstanding.
Consumption reduction, the effect of increasing income is remarkable, by producing 150000 tons of urea measuring and calculating per year, surplus a year economic benefit reaches 50 ten thousand yuan.
Describe the present invention below in detail.
Description of drawings
Fig. 1 is a process flow sheet of the present invention.
Fig. 2 is the structure iron of liquid gas jet device.
Letter representation among the figure: A-middle pressure steam is from steam system; B-tail gas is from one section vaporizer-condenser; C-tail gas is from intermediate condenser; D-urea ammonium fluid is from the dual circulation condenser; E-urea ammonium fluid is from vaporizer-condenser; Steam behind F-absorption tail gas goes a vapor phase; Steam behind G-absorption tail gas goes the emptying house steward; Urea ammonium fluid devaporation condensation liquid bath behind H-absorption tail gas.
Embodiment
Referring to Fig. 1, Fig. 2: implementing method of the present invention, at first is to improve the device that vacuumizes, and makes a closed cycle device that is formed by connecting in regular turn by pipeline by pump 1, liquid gas jet device 2, circulation groove 3, replaces the steam vacuum extractor to vacuumize.The key part of this device is an injector 2, it is that the injector of the applicable liquid medium made of specialized designs is (open at Chinese patent, publication number CN85102383A), this liquid gas jet device 2 comprises air chamber 23 and the one-level liquid gas mixing tube 24, secondary liquid gas mixing tube 25 and the volume-expanding pressure-reducing Taper Pipe 26 that are arranged on the same axis, the roof of air chamber 23 is provided with liquid jet 22, wall is provided with gas feed 21, and one-level liquid gas mixing tube 24 is located in the air chamber 23, and is corresponding with nozzle 22; Secondary liquid gas mixing tube 25 and volume-expanding pressure-reducing Taper Pipe 26 are end to end integral body, and secondary liquid gas mixing tube 25 suitable for reading is located on the diapire of air chamber 23, and be corresponding with one-level liquid gas mixing tube 24.Have that operting differential pressure is little, vacuum tightness is high, the efficient advantages of higher, this is to implement technology prerequisite of the present invention.
With 2 parallel connections of two liquid gas jet devices, its medium inlet links to each other with the outlet of pump 1, and outlet is connected with circulation groove 3, and bleeding point is connected with intermediate condenser with one section vaporizer-condenser of Urea Evaporation System respectively.Pump 1 is for medium circulation provides power, and medium circulates in circulation device, and high-velocity jet during through the throttling range of liquid gas jet device 2 forms negative pressure at bleeding point, the tail gas of Urea Evaporation System is extracted out and is formed the vacuum of Urea Evaporation System.
Outstanding feature of the present invention is to utilize the urea ammonium fluid to be ejection medium, and Urea Evaporation System is vacuumized.The circulation groove 3 and the urea ammonium fluid system connectivity of circulation device, its import connects dual circulation condenser and evaporative condenser liquid pump, and outlet connects the evaporative condenser liquid bath.The top layer clear liquid of urea ammonium fluid system is pumped into circulation groove from dual circulation condenser and evaporation condensate, gets back to urea ammonium fluid system through the evaporative condenser liquid bath again behind the absorption tail gas.Like this, the urea ammonium fluid both circulated in the closed cycle device, in the circulation of urea ammonium fluid native system, had both realized vacuumizing again, had reclaimed the ammonia in the tail gas again, and also not emptying is free from environmental pollution.
Because exhaust temperature is higher, temperature raise after the urea ammonium fluid absorbed tail gas, and there is disadvantageous effect in system, thus the water cooler 4 of between circulation groove 3 and pump 1, connect, the temperature of reduction urea ammonium fluid, the effect of assurance absorption tail gas.
The pump 1 of circulation device preferably is equipped with two, a job, and one is standby, with the reliability of intensifier.
Stable, continuous for what guarantee to produce, preventing that circulation device from hindering for some reason or overhauling influences ordinary production, can keep the original steam vacuum extractor, in parallel the closed cycle device with the original steam vacuum extractor, can use wherein a kind of respectively by valve 6,7,8,9,10,11 switchings.Tail gas enters the liquid gas jet device 2 of this circulation device more earlier through the squirt pump 5 of original steam vacuum extractor.Blocked operation is very simple, as vacuumizing with present method, need only valve-off 6,7,8,9, and open valve 10,11 and get final product; Otherwise then valve-off 10,11, open valve 6,7,8,9.During installation, the locus of closed cycle device will be arranged in below the original steam vacuum extractor, to reduce power consumption.
Claims (6)
1. urea production vapo(u)rization system vacuum pumping method, it is characterized in that: a closed cycle device that is formed by connecting in regular turn by pipeline by pump (1), liquid gas jet device (2), circulation groove (3) is set, utilize the urea ammonium fluid to be circulatory mediator, Urea Evaporation System is vacuumized.
2. urea production vapo(u)rization system vacuum pumping method according to claim 1, it is characterized in that: described liquid gas jet device (2) comprises air chamber (23) and is arranged in one-level liquid gas mixing tube (24), secondary liquid gas mixing tube (25) and volume-expanding pressure-reducing Taper Pipe (26) on the same axis, the roof of air chamber (23) is provided with liquid jet (22), wall is provided with gas feed (21), one-level liquid gas mixing tube (24) is located in the air chamber (23), and is corresponding with nozzle (22); Secondary liquid gas mixing tube (25) and volume-expanding pressure-reducing Taper Pipe (26) are end to end integral body, and secondary liquid gas mixing tube (25) suitable for reading is located on the diapire of air chamber (23), and be corresponding with one-level liquid gas mixing tube (24).
3. urea production vapo(u)rization system vacuum pumping method according to claim 1 is characterized in that: (2) two parallel connections of described liquid gas jet device, its bleeding point are connected with intermediate condenser with one section vaporizer-condenser of Urea Evaporation System respectively.
4. urea production vapo(u)rization system vacuum pumping method according to claim 1 is characterized in that: described circulation groove (3) and urea ammonium fluid system connectivity, and its import connects dual circulation condenser and evaporative condenser liquid pump, and outlet connects the evaporative condenser liquid bath.
5. according to the described urea production vapo(u)rization system of claim 1 vacuum pumping method, it is characterized in that: be in series with water cooler (4) between circulation groove of described closed cycle device (3) and the pump (1).
6. according to the described urea production vapo(u)rization system of claim 1 vacuum pumping method, it is characterized in that: described closed cycle device is in parallel with the original steam vacuum extractor, can use wherein a kind of respectively by valve (5,6,7,8,9,10,11) switching; The relative original steam vacuum extractor of closed cycle device is installed in low level.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200310110980 CN1226283C (en) | 2003-11-19 | 2003-11-19 | Vaporizing system vacuumizing method for urea production |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200310110980 CN1226283C (en) | 2003-11-19 | 2003-11-19 | Vaporizing system vacuumizing method for urea production |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1544417A CN1544417A (en) | 2004-11-10 |
| CN1226283C true CN1226283C (en) | 2005-11-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200310110980 Expired - Lifetime CN1226283C (en) | 2003-11-19 | 2003-11-19 | Vaporizing system vacuumizing method for urea production |
Country Status (1)
| Country | Link |
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| CN (1) | CN1226283C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102389639A (en) * | 2011-11-07 | 2012-03-28 | 毕节金河化工有限公司 | Urea solution evaporation and concentration equipment |
| CN102606545A (en) * | 2012-02-14 | 2012-07-25 | 浠水县福瑞德化工有限责任公司 | Water vacuumizing method and water vacuumizing system in urea production |
| CN107674002B (en) * | 2017-09-22 | 2023-10-27 | 河南心连心蓝色环保科技有限公司 | Production device and production method of low biuret content vehicle urea powder |
-
2003
- 2003-11-19 CN CN 200310110980 patent/CN1226283C/en not_active Expired - Lifetime
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| Publication number | Publication date |
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| CN1544417A (en) | 2004-11-10 |
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