CN202555156U - Urea hydrolysis system applied to flue gas denitrification - Google Patents
Urea hydrolysis system applied to flue gas denitrification Download PDFInfo
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- CN202555156U CN202555156U CN2012200326939U CN201220032693U CN202555156U CN 202555156 U CN202555156 U CN 202555156U CN 2012200326939 U CN2012200326939 U CN 2012200326939U CN 201220032693 U CN201220032693 U CN 201220032693U CN 202555156 U CN202555156 U CN 202555156U
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- urea
- urea liquid
- storage tank
- hydrolysis
- flue gas
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Abstract
The utility model discloses a urea hydrolysis system applied to flue gas denitrification. The system comprises a urea dissolution tank, urea solution delivery pumps, a urea solution storage tank, urea solution supply pumps and a urea hydrolyzer, wherein a water outlet of the urea dissolution tank is connected with water inlets of the urea solution delivery pumps; water outlets of the urea solution delivery pumps are connected with a water inlet of the urea solution storage tank; a water outlet and a urea solution returning port are formed in the urea solution storage tank, and the water outlet is connected with water inlets of the urea solution supply pumps; and water outlets of the urea solution supply pumps are connected with the urea solution returning port of the urea solution storage tank and a water inlet of the urea hydrolyzer respectively. By the urea hydrolysis system, urea can be hydrolyzed to generate ammonia, and compared with a system directly using liquid ammonia, the system has the advantages of greatly improving the safety of transportation and storage processes and reducing the transportation cost by about 80 percent. By the technology, steam generated by a boiler can be easily obtained as a heat source, so that the energy consumption of the system is lowered.
Description
Technical field
The utility model relates to a kind of flue gas denitrification system, particularly relates to a kind of hydrolysis of urea system that is applied to denitrating flue gas.
Background technology
At present, the denitrating flue gas reducing agent adopts liquefied ammonia (anhydrous ammonia), ammoniacal liquor and urea usually.Liquefied ammonia belongs to Hazardous Chemical Substances, transportation, stores all to exist bigger danger, People more and more to recognize to use in the population concentration area and has great potential safety hazard; The concentration of ammoniacal liquor generally is controlled at about 15%, transport and store comparatively safe, but about 85% water has increased cost of transportation widely, therefore uses less.Urea liquid heats the meeting hydrolytic reactions under uniform temperature and pressure limit, generate NH3, CO2 and steam, and ammonia wherein promptly can be used as denitrification reducing agent.Because urea belongs to the general chemical product, transportation, the not dangerous property of storage are superior to liquefied ammonia and ammoniacal liquor as a lot of aspects of denitrification reducing agent.Existing routine hydrolysis system flow is complicated, and running effect is relatively poor.
The utility model content
The purpose of the utility model is that a kind of security performance that provides in order to address the above problem is high, flow process is more simplified, simple to operate, the hydrolysis of urea system that is applied to denitrating flue gas that energy consumption is lower.
The utility model is realized through following technical scheme:
A kind of hydrolysis of urea system that is applied to denitrating flue gas; Comprise urea dissolving tank, urea liquid delivery pump, urea liquid storage tank, urea liquid supply pump and urea hydrolyser; The discharge outlet of said urea dissolving tank is connected with the water inlet of said urea liquid delivery pump; The delivery port of said urea liquid delivery pump is connected with the water inlet of said urea liquid storage tank; Said urea liquid storage tank is provided with delivery port and urea liquid return port, and said delivery port is connected with the water inlet of said urea liquid supply pump, and the delivery port of said urea liquid supply pump is connected with the urea liquid return port of said urea liquid storage tank and the water inlet of urea hydrolyser respectively.
In dissolving tank; With demineralized water urea is processed 40～50% urea liquid; Through the urea liquid delivery pump urea liquid is transported to the urea liquid storage tank again, is transported in the urea hydrolyser through the urea liquid of urea liquid supply pump with concentration about 40～50% then, hydrolysis takes place in urea liquid in urea hydrolyser; The ammonia flow that contains that generates in the hydrolysis reactor is diluted by air, after this gets into ammonia-flue gas hybrid system.
The utility model reaction principle is urea liquid hydrolytic reactions under certain temperature and pressure, produces ammonia, carbon dioxide and water vapour, and reaction equation is: NH
2-CO-NH
2+ H
2O=2NH
3+ CO
2
Further improvement as the utility model is that the periphery of said urea hydrolyser is provided with the ammonia detector.
Hydrolysis device and reductant supply system periphery are provided with the ammonia detector, detecting the leakage of ammonia, and show the concentration of ammonia in the atmosphere.When detector records in the atmosphere ammonia excessive concentration, can give the alarm in the unit control room, operating personnel take measures necessary, take place with the abnormal conditions that prevent ammonia leakage.
Further improvement as the utility model is that the conveyance conduit between said urea liquid storage tank and the said urea liquid supply pump is provided with embedded twin filter.
Further improvement as the utility model is that the conveyance conduit between said urea liquid storage tank and the said urea liquid supply pump is provided with differential pressure transmitter.The differential pressure transformer is used to detect filter screen pressure reduction, determines whether to clean.
Further improvement as the utility model is also to comprise companion's thermic devices and the thermal insulation medium layer that is arranged in urea liquid conveyance conduit and the gas ammonia conveyance conduit.
The said hydrolysis of urea of the utility model system need to and equipment such as jet chimney, ammonia pipeline and pipeline be incubated, urea liquid pipeline, ammonia pipeline are accompanied heat.Urea liquid pipeline tracing temperature is controlled at about 30 ℃, and ammonia pipeline tracing temperature is controlled at about 170 ℃, is lower than this set point of temperature and promptly starts tracing system, to prevent in the urea liquid that urea is separated out and ammonia condenses.
Further improvement as the utility model is, said urea dissolving delivery pump adopts centrifugal pump, and the platform number of said centrifugal pump is the 1-2 platform.
Further improvement as the utility model is, said urea liquid supply pump adopts multistage SS centrifugal pump, and the platform number of said multistage SS centrifugal pump is the 1-2 platform.
The beneficial effect of the utility model is:
Can hydrolysis of urea be produced ammonia through said hydrolysis of urea system, as the denitrating flue gas reducing agent, the security of relatively directly using liquefied ammonia to improve transportation and storage process greatly is than using ammoniacal liquor can reduce by about 80% freight.Simultaneously; With respect to urea pyrolysis technique for production of ammonia; The said hydrolysis of urea of the utility model system does not need natural gas or diesel combustion to provide heat that air heat is arrived nearly 600 ℃; But the steam that the boiler that utilize to be very easy to obtains produces is as thermal source, and about 150 ℃ of the ammonia temperature of generation greatly reduces said system energy consumption.
Description of drawings
Urea granules dissolving in the hydrolysis of urea system that Fig. 1 is applied to denitrating flue gas for the utility model is said, store and supply with the sketch map of part;
The sketch map of urea liquid hydrolysis reactor part in the hydrolysis of urea system that Fig. 2 is applied to denitrating flue gas for the utility model is said;
Among the figure: 1-urea dissolving tank, 2-urea liquid delivery pump, 3-urea liquid storage tank, 4-urea liquid supply pump, 5-urea hydrolyser, 6-agitator, the embedded twin filter of 7-, 8-differential pressure transmitter, 301-delivery port, 302-urea liquid return port.
The specific embodiment
Below in conjunction with accompanying drawing and specific embodiment the utility model is done further to specify:
As depicted in figs. 1 and 2; A kind of hydrolysis of urea system that is applied to denitrating flue gas of the utility model; Comprise urea dissolving tank 1, urea liquid delivery pump 2, urea liquid storage tank 3, urea liquid supply pump 4 and urea hydrolyser 5; The discharge outlet of urea dissolving tank 1 is connected with the water inlet of urea liquid delivery pump 2; The delivery port of urea liquid delivery pump 2 is connected with the water inlet of urea liquid storage tank 3; Urea liquid storage tank 3 is provided with delivery port 301 and urea liquid return port 302, and delivery port 301 is connected with the water inlet of urea liquid supply pump 4, and the delivery port of urea liquid supply pump 4 is connected with the urea liquid return port 302 of urea liquid storage tank 3 and the water inlet of urea hydrolyser 5 respectively.
In urea dissolving tank 1; With demineralized water urea is processed 40～50% urea liquid, through urea liquid delivery pump 2 urea liquid is transported to urea liquid storage tank 3 again, be transported in the urea hydrolyser 5 through the urea liquid of urea liquid supply pump 4 then concentration about 40～50%; Saturated vapor gets into urea hydrolyser 5 through the mode of heat(ing) coil; Saturated vapor does not mix with urea liquid, refluxes through heat(ing) coil, and condensed water is reclaimed by retracting device; In addition, the urea concentration in the urea hydrolyser 5 can reach 40～50%.The ammonia flow that contains that generates in the urea hydrolyser 5 is diluted by air, after this gets into ammonia-flue gas hybrid system.
The utility model reaction principle is urea liquid hydrolytic reactions under certain temperature and pressure, produces ammonia, carbon dioxide and water vapour, and reaction equation is: NH2-CO-NH2+H2O=2NH3+CO2.
Urea dissolving tank 1 tank body material adopts stainless steel, inside lining anti-corrosive material.Be provided with agitator 6 in the urea dissolving tank 1, agitator 6 adopts the jacking-type agitator.Quicken the dissolving of urea granules in the urea dissolving tank 1 through the effect of agitator 6.The periphery of urea hydrolyser 5 is provided with the ammonia detector.Hydrolysis device and reductant supply system periphery are provided with ammonia detector (all not showing among the figure), detecting the leakage of ammonia, and show the concentration of ammonia in the atmosphere.When detector records in the atmosphere ammonia excessive concentration, can give the alarm in the unit control room, operating personnel take measures necessary, take place with the abnormal conditions that prevent ammonia leakage.
Conveyance conduit between urea liquid storage tank 3 and the urea liquid supply pump 4 is provided with embedded twin filter 7.Conveyance conduit between urea liquid storage tank 3 and the urea liquid supply pump 4 is provided with differential pressure transmitter 8.Differential pressure transformer 8 is used to detect filter screen pressure reduction, determines whether to clean.
The utility model also comprises the thermal insulation medium layer (all not showing among the figure) that companion's thermic devices is outer with being arranged at urea liquid conveyance conduit and gas ammonia conveyance conduit.Said hydrolysis of urea system need to and equipment such as jet chimney, ammonia pipeline and pipeline be incubated, urea liquid pipeline, ammonia pipeline are accompanied heat.Urea liquid pipeline tracing temperature is controlled at about 30 ℃, and ammonia pipeline tracing temperature is controlled at about 170 ℃, is lower than this set point of temperature and promptly starts tracing system, to prevent in the urea liquid that urea is separated out and ammonia condenses.Be provided with discharge and temperature control system in the urea dissolving tank 1.Cross when low when the urea liquid temperature, temperature control system starts makes the temperature of solution be higher than 30 ℃.
Urea liquid delivery pump 2 adopts centrifugal pump, and the platform number of centrifugal pump is 1 or 2.In the present embodiment, the platform number of centrifugal pump is 2.Centrifugal pump body material is a stainless steel, and sealed material is a carborundum.Two centrifugal pump one fortune one are equipped with, and will dissolve uniform urea liquid and be delivered to 3 storages of urea liquid storage tank.In addition, centrifugal pump exit portion solution returns dissolving tank, guarantees the adequacy and the uniformity of urea dissolving.
Urea liquid supply pump 4 adopts multistage SS centrifugal pump, and the platform number of multistage SS centrifugal pump is 1 or 2.In the present embodiment, the platform number of multistage SS centrifuge is 2, and a fortune one is equipped with, and solution in the urea liquid storage tank is delivered to hydrolysis device.The hydrolysis of urea system adopts on-site control PLC to realize control automatically.
Claims (7)
1. hydrolysis of urea system that is applied to denitrating flue gas; It is characterized in that: comprise urea dissolving tank, urea liquid delivery pump, urea liquid storage tank, urea liquid supply pump and urea hydrolyser; The discharge outlet of said urea dissolving tank is connected with the water inlet of said urea liquid delivery pump; The delivery port of said urea liquid delivery pump is connected with the water inlet of said urea liquid storage tank; Said urea liquid storage tank is provided with delivery port and urea liquid return port; Said delivery port is connected with the water inlet of said urea liquid supply pump, and the delivery port of said urea liquid supply pump is connected with the urea liquid return port of said urea liquid storage tank and the water inlet of urea hydrolyser respectively.
2. a kind of hydrolysis of urea system that is applied to denitrating flue gas according to claim 1 is characterized in that:
The periphery of said urea hydrolyser is provided with the ammonia detector.
3. a kind of hydrolysis of urea system that is applied to denitrating flue gas according to claim 1 is characterized in that: the conveyance conduit between said urea dissolving storage tank and the said urea liquid supply pump is provided with embedded twin filter.
4. a kind of hydrolysis of urea system that is applied to denitrating flue gas according to claim 1 is characterized in that: the conveyance conduit between said urea dissolving storage tank and the said urea liquid supply pump is provided with differential pressure transmitter.
5. a kind of hydrolysis of urea system that is applied to denitrating flue gas according to claim 1 is characterized in that: also comprise the thermal insulation medium layer that companion's thermic devices is outer with being arranged at urea liquid conveyance conduit and gas ammonia conveyance conduit.
6. a kind of hydrolysis of urea system that is applied to denitrating flue gas according to claim 1 is characterized in that: said urea dissolving delivery pump adopts centrifugal pump, and the platform number of said centrifugal pump is the 1-2 platform.
7. a kind of hydrolysis of urea system that is applied to denitrating flue gas according to claim 1, it is characterized in that: said urea liquid supply pump adopts multistage SS centrifugal pump, and the platform number of said multistage SS centrifugal pump is the 1-2 platform.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200326939U CN202555156U (en) | 2012-02-02 | 2012-02-02 | Urea hydrolysis system applied to flue gas denitrification |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200326939U CN202555156U (en) | 2012-02-02 | 2012-02-02 | Urea hydrolysis system applied to flue gas denitrification |
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|---|---|
| CN202555156U true CN202555156U (en) | 2012-11-28 |
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| CN2012200326939U Ceased CN202555156U (en) | 2012-02-02 | 2012-02-02 | Urea hydrolysis system applied to flue gas denitrification |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107433123A (en) * | 2017-08-29 | 2017-12-05 | 东莞市升佳净水材料有限公司 | A kind of SNCR flue-gas denitration process denitrfying agent |
| CN108970441A (en) * | 2017-06-01 | 2018-12-11 | 大唐环境产业集团股份有限公司 | A kind of design method of denitrogenation urea solution preparing device |
| CN116025852A (en) * | 2023-03-28 | 2023-04-28 | 国能龙源环保有限公司 | Method for reducing urea solution temperature in urea solution storage tank |
-
2012
- 2012-02-02 CN CN2012200326939U patent/CN202555156U/en not_active Ceased
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108970441A (en) * | 2017-06-01 | 2018-12-11 | 大唐环境产业集团股份有限公司 | A kind of design method of denitrogenation urea solution preparing device |
| CN107433123A (en) * | 2017-08-29 | 2017-12-05 | 东莞市升佳净水材料有限公司 | A kind of SNCR flue-gas denitration process denitrfying agent |
| CN116025852A (en) * | 2023-03-28 | 2023-04-28 | 国能龙源环保有限公司 | Method for reducing urea solution temperature in urea solution storage tank |
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| GR01 | Patent grant | ||
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| IW01 | Full invalidation of patent right |
Decision date of declaring invalidation: 20140728 Decision number of declaring invalidation: 23382 Granted publication date: 20121128 |
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| IW01 | Full invalidation of patent right |
Decision date of declaring invalidation: 20140728 Decision number of declaring invalidation: 23382 Granted publication date: 20121128 |
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| IW01 | Full invalidation of patent right |