CN220878384U - Device for preparing ammonia by urea hydrolysis and accurately controlling ammonia spraying in partitioned mode - Google Patents
Device for preparing ammonia by urea hydrolysis and accurately controlling ammonia spraying in partitioned mode Download PDFInfo
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- CN220878384U CN220878384U CN202322555509.XU CN202322555509U CN220878384U CN 220878384 U CN220878384 U CN 220878384U CN 202322555509 U CN202322555509 U CN 202322555509U CN 220878384 U CN220878384 U CN 220878384U
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- ammonia
- urea
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- urea hydrolysis
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- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 title claims abstract description 250
- 229910021529 ammonia Inorganic materials 0.000 title claims abstract description 121
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 title claims abstract description 67
- 239000004202 carbamide Substances 0.000 title claims abstract description 66
- 238000006460 hydrolysis reaction Methods 0.000 title claims abstract description 43
- 230000007062 hydrolysis Effects 0.000 title claims abstract description 40
- 238000005507 spraying Methods 0.000 title claims abstract description 33
- 238000004519 manufacturing process Methods 0.000 claims abstract description 27
- 239000003054 catalyst Substances 0.000 claims abstract description 24
- 238000002347 injection Methods 0.000 claims abstract description 17
- 239000007924 injection Substances 0.000 claims abstract description 17
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 10
- 238000006243 chemical reaction Methods 0.000 claims abstract description 10
- 239000003546 flue gas Substances 0.000 claims abstract description 10
- 239000000243 solution Substances 0.000 claims abstract description 10
- 238000010790 dilution Methods 0.000 claims abstract description 8
- 239000012895 dilution Substances 0.000 claims abstract description 8
- 238000003860 storage Methods 0.000 claims abstract description 7
- 230000001276 controlling effect Effects 0.000 claims description 12
- 238000013316 zoning Methods 0.000 claims description 9
- 239000007789 gas Substances 0.000 claims description 6
- 238000002360 preparation method Methods 0.000 claims description 5
- 238000000926 separation method Methods 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 229910019142 PO4 Inorganic materials 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
- 239000010452 phosphate Substances 0.000 claims description 4
- 230000001105 regulatory effect Effects 0.000 claims description 4
- 230000001360 synchronised effect Effects 0.000 claims description 4
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims description 3
- 238000000738 capillary electrophoresis-mass spectrometry Methods 0.000 claims description 2
- 238000012544 monitoring process Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 6
- 238000000034 method Methods 0.000 abstract description 4
- 238000005192 partition Methods 0.000 abstract description 4
- 238000005457 optimization Methods 0.000 abstract description 3
- 238000010531 catalytic reduction reaction Methods 0.000 abstract description 2
- 230000004044 response Effects 0.000 abstract description 2
- 239000003638 chemical reducing agent Substances 0.000 description 5
- 239000000047 product Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000000197 pyrolysis Methods 0.000 description 3
- 239000007921 spray Substances 0.000 description 3
- LFVGISIMTYGQHF-UHFFFAOYSA-N ammonium dihydrogen phosphate Chemical compound [NH4+].OP(O)([O-])=O LFVGISIMTYGQHF-UHFFFAOYSA-N 0.000 description 2
- 229910000387 ammonium dihydrogen phosphate Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 235000019837 monoammonium phosphate Nutrition 0.000 description 2
- 239000006012 monoammonium phosphate Substances 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 239000005696 Diammonium phosphate Substances 0.000 description 1
- OWIKHYCFFJSOEH-UHFFFAOYSA-N Isocyanic acid Chemical compound N=C=O OWIKHYCFFJSOEH-UHFFFAOYSA-N 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 1
- XLJMAIOERFSOGZ-UHFFFAOYSA-N anhydrous cyanic acid Natural products OC#N XLJMAIOERFSOGZ-UHFFFAOYSA-N 0.000 description 1
- PPBAJDRXASKAGH-UHFFFAOYSA-N azane;urea Chemical compound N.NC(N)=O PPBAJDRXASKAGH-UHFFFAOYSA-N 0.000 description 1
- OHJMTUPIZMNBFR-UHFFFAOYSA-N biuret Chemical compound NC(=O)NC(N)=O OHJMTUPIZMNBFR-UHFFFAOYSA-N 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- MNNHAPBLZZVQHP-UHFFFAOYSA-N diammonium hydrogen phosphate Chemical compound [NH4+].[NH4+].OP([O-])([O-])=O MNNHAPBLZZVQHP-UHFFFAOYSA-N 0.000 description 1
- 229910000388 diammonium phosphate Inorganic materials 0.000 description 1
- 235000019838 diammonium phosphate Nutrition 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 125000002467 phosphate group Chemical group [H]OP(=O)(O[H])O[*] 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000006722 reduction reaction Methods 0.000 description 1
- 238000002407 reforming Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
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- Treating Waste Gases (AREA)
Abstract
A device for urea hydrolysis ammonia production and regional accurate control spouts ammonia relates to boiler flue gas denitration system ammonia production equipment technical field. The device comprises an ammonia production system and an ammonia spraying system connected with the ammonia production system. The ammonia production system is structurally characterized by comprising a urea dissolving tank, a urea dissolving pump, a urea solution storage tank, a urea solution conveying pump and a urea hydrolysis reactor which are sequentially connected, wherein the catalyst tank is connected to the urea hydrolysis reactor through a catalyst pump. The ammonia spraying system comprises an adjusting and metering module, an ammonia air mixer, an SCR inlet flue and an SCR reactor which are sequentially connected, wherein air is connected to the air inlet side of the ammonia air mixer through a dilution fan and a dilution air heater, and an ammonia spraying grid, a flue guide plate and an SCR rectification grid are sequentially arranged in the SCR inlet flue according to the flue gas flow direction. The method has the advantages of high reaction rate, capability of meeting the denitration requirement of the boiler by changing the load response time, capability of effectively reducing the production cost, capability of improving the ammonia injection efficiency and the selective catalytic reduction SCR reaction effect through flow field optimization and partition precise control.
Description
Technical Field
The utility model relates to the technical field of ammonia production equipment of a boiler flue gas denitration system, in particular to an ammonia production process by urea hydrolysis and a zoned accurate control ammonia spraying device.
Background
The coal-fired power plant is required to be provided with a denitration system according to the environmental protection requirement, and a reducing agent of the denitration system generally uses liquid ammonia and urea, and the preparation of ammonia mainly comprises the methods of preparing ammonia from liquid ammonia, preparing ammonia from urea through pyrolysis, preparing ammonia from urea through hydrolysis and the like.
The process for preparing ammonia by evaporating liquid ammonia is simple and mature, the installation investment and the operation maintenance cost are low, most of domestic coal-fired power plants already adopt liquid ammonia as a reducing agent, the liquid ammonia belongs to dangerous goods, potential safety hazards exist in transportation and storage, a liquid ammonia storage tank belongs to a major dangerous source, and if an accident of leakage of an ammonia area occurs, the safety production of the power plants, the safety of surrounding residents and the ecological environment are influenced. The national energy agency requires that the project of replacing and reforming the important dangerous source of liquid ammonia be completed on schedule.
Industrial urea is used as a reducing agent, is usually granular, has great advantages in the aspects of transportation and storage safety, and has no potential safety hazard basically. The ammonia production from urea is divided into ammonia production from urea pyrolysis and ammonia production from urea hydrolysis, and the problem of high running cost exists due to high urea pyrolysis temperature. Along with the continuous progress of the urea hydrolysis ammonia production process, the urea hydrolysis has the advantages of low operation energy consumption, safety and stability, so that the urea hydrolysis ammonia production process becomes the first choice of the denitration reducing agent of the coal-fired power plant. At present, a coal-fired power plant is started to change the denitration reducing agent from liquid ammonia into urea, and simultaneously, an ammonia spraying system is matched and improved.
However, in the existing ammonia production by urea hydrolysis, a single catalyst is used for catalytic hydrolysis, and the energy consumption and the ammonia production cost are increased due to the slow reaction rate.
Disclosure of Invention
Aiming at the defects in the prior art, the utility model aims to provide a device for preparing ammonia by urea hydrolysis and accurately controlling ammonia injection in a partitioned manner. The method has the advantages that the reaction rate is high, the variable load response time meets the denitration requirement of the boiler, the production cost is effectively reduced, the ammonia injection efficiency is improved through flow field optimization and precise control of partition, and the selective catalytic reduction SCR reaction effect is improved.
In order to achieve the above object, the technical scheme of the present utility model is implemented as follows:
A device for preparing ammonia by urea hydrolysis and accurately controlling ammonia spraying in a partitioned mode comprises an ammonia preparation system and an ammonia spraying system connected with the ammonia preparation system. The ammonia production system is structurally characterized by comprising a urea dissolving tank, a urea dissolving pump, a urea solution storage tank, a urea solution conveying pump and a urea hydrolysis reactor which are sequentially connected, wherein the catalyst tank is connected to the urea hydrolysis reactor through a catalyst pump. The ammonia spraying system comprises an adjusting and metering module, an ammonia air mixer, an SCR inlet flue and an SCR reactor which are sequentially connected, wherein air is connected to the air inlet side of the ammonia air mixer through a dilution fan and a dilution air heater, and an ammonia spraying grid, a flue guide plate and an SCR rectification grid are sequentially arranged in the SCR inlet flue according to the flue gas flow direction. The ammonia-containing product gas generated by the urea hydrolysis reactor is input into the regulation metering module.
In the device for preparing ammonia by urea hydrolysis and accurately controlling ammonia spraying in the partitioned mode, a partitioned ammonia adjusting system is arranged outside the ammonia spraying grille, an accurate ammonia spraying module is arranged inside the ammonia spraying grille, and the accurate ammonia spraying system is formed by the ammonia spraying grille and a partitioned synchronous measuring module arranged at an outlet of the SCR reactor and is controlled by a distributed control system DCS.
In the device for preparing ammonia by urea hydrolysis and precisely controlling ammonia spraying in a partitioned manner, the urea hydrolysis reactor is internally provided with the steam-water separation device.
In the device for preparing ammonia by urea hydrolysis and accurately controlling ammonia spraying in a partitioned mode, the SCR reactor is internally provided with the SCR catalyst and the catalyst module supporting beam, denitration reaction is carried out in the SCR reactor, and a flue gas automatic monitoring CEMS module is arranged at an outlet of the SCR reactor.
In the device for preparing ammonia by urea hydrolysis and accurately controlling ammonia injection in the partitioned mode, the SCR region metering regulating valve group is arranged in the regulating metering module.
In the device for preparing ammonia by urea hydrolysis and precisely controlling ammonia injection in a partitioned manner, the catalyst used in the catalyst tank is a phosphate mixture.
Due to the adoption of the structure, compared with the prior art, the utility model has the following advantages and beneficial effects:
The embodiment of the utility model has the following beneficial effects:
1. The novel catalyst is phosphate mixture, and has the advantages of high reaction rate, low consumption, safety, environmental protection and production cost reduction.
2. Through computational fluid dynamics CFD simulation flow field optimization, the ammonia air mixer, the ammonia spraying grid and the guide plate are reasonably arranged, the ammonia air mixing effect is improved, and the escape of ammonia at the outlet of the SCR reactor is reduced.
3. The zoning accurate control ammonia spraying device is adjusted by arranging a multi-point zoning synchronous measurement system, an advanced intelligent refined control system and an ammonia spraying grid valve, so that local ammonia concentration in SCR is prevented from being higher, and the SCR device is leveled on line.
The utility model is further described below with reference to the drawings and the detailed description.
Drawings
FIG. 1 is a schematic diagram of a urea hydrolysis ammonia production process in an embodiment of the utility model;
FIG. 2 is a schematic diagram of a process flow for precisely controlling ammonia injection by partition in an embodiment of the utility model;
Fig. 3 is a schematic diagram of a principle of precisely controlling ammonia injection by partition in an embodiment of the utility model.
Description of the embodiments
The following description of the inventive arrangements is merely a partial, and not an entire, novel example.
Referring to fig. 1 to 3, a urea solution with a concentration of 50% in a urea dissolving tank 1 is sent to a urea solution storage tank 3 through a urea dissolving pump 2, and then is sent to a urea hydrolysis reactor 5 by a urea solution delivery pump 4 for hydrolysis reaction.
The catalyst solution in the catalyst tank 6 is fed to the urea hydrolysis reactor 5 by a catalyst pump 7.
The technology for preparing ammonia from urea carries out rapid hydrolysis reaction at the temperature of 130-150 ℃ and the pressure of about 0.40-0.6MPa, and the ammonia-containing product gas at the outlet of the urea hydrolysis reactor 5 contains 37.5 percent of ammonia.
The urea hydrolysis reactor 5 is internally provided with a steam-water separation device, and hydrolyzed ammonia-containing product gas is sent to an adjusting and metering module 10 of the SCR region through an ammonia supply main pipe, and the adjusting and metering module 10 adjusts ammonia supply flow and pressure.
The air intake side of the ammonia air mixer 11 is provided with a dilution blower 8 and a dilution air heater 9. The diluted air is pressurized and heated, the hot air is mixed with ammonia-containing product gas from the flow regulating module 10, and the ammonia content of the mixed gas is below 5%.
The mixed air outlet side of the ammonia air mixer 11 is connected with an SCR inlet flue through a pipeline, and sequentially passes through an ammonia spraying grid 12, a guide plate and a rectifying grid in the flue according to the flue gas flow direction, and enters an SCR reactor, wherein an SCR catalyst and a catalyst module supporting beam are arranged in the SCR reactor, and denitration reaction is carried out in the SCR reactor.
The urea hydrolysis reaction equation of the urea ammonia production technology is as follows:
(NH2)2CO + H2O=CO2↑+ 2NH3↑
the application has low technical operation temperature and higher reaction rate, thus reducing the generation of isocyanic acid and biuret byproducts, improving the urea decomposition rate, and increasing the corrosion resistance of stainless steel by 2 to 3 times, and leading the equipment to operate more stably and reliably.
The novel catalyst in this example is a phosphate mixture comprising: diammonium phosphate, monoammonium phosphate, wherein monoammonium phosphate is 70%.
The urea hydrolysis reactor 5 is provided with the high-efficiency steam-water separator, and the high-efficiency demisting is realized through cyclone separation, so that the steam-water separation effect can reach more than 98%.
According to the application, the flow field is optimized through CFD simulation, the ammonia air mixer, the ammonia spraying grid and the guide plate are reasonably arranged and distributed, and the ammonia air mixing effect is improved. According to the embodiment, the arrangement of the spray nozzles of the ammonia spraying grid in a partitioned manner is optimized, the number and the flow rate of the spray nozzles are reasonably configured, the ammonia air mixing effect and the ammonia spraying grid are improved, the number of single branch nozzles of the ammonia spraying grid is 5 at most, and the flow rate of the spray nozzles is controlled to be 30-40 m/s.
The zoning accurate control ammonia spraying device provided by the application is used for avoiding the partial high ammonia concentration in the SCR reactor by arranging the multi-point zoning synchronous measurement system, the advanced intelligent refined control system and the ammonia spraying grid valve adjustment, so that the SCR device is leveled on line.
After the flue gas is guided, mixed flow and rectified, the maximum deviation of the speed is < +/-15 percent, the maximum absolute deviation of the temperature is < +/-10 ℃ and the maximum deviation of the ammonia nitrogen molar ratio is < +/-5 percent at the inlet of the top catalyst, and the angle (the included angle with the vertical direction) of the flue gas entering the catalyst is < +/-10 degrees.
The foregoing description of the embodiments of the utility model has been presented for the purposes of illustration and description and is not intended to be exhaustive or to limit the utility model to the precise form disclosed. It should be noted that other modifications and adaptations to the utility model which do not depart from the spirit of the utility model will be apparent to those of ordinary skill in the art to which the utility model pertains.
Claims (6)
1. The device for preparing ammonia by urea hydrolysis and precisely controlling ammonia spraying in a partitioned manner comprises an ammonia preparation system and an ammonia spraying system connected with the ammonia preparation system; the ammonia production system is characterized by comprising a urea dissolving tank (1), a urea dissolving pump (2), a urea solution storage tank (3), a urea solution conveying pump (4) and a urea hydrolysis reactor (5) which are sequentially connected, wherein a catalyst tank (6) is connected to the urea hydrolysis reactor (5) through a catalyst pump (7); the ammonia spraying system comprises an adjusting and metering module (10), an ammonia air mixer (11), an SCR inlet flue and an SCR reactor which are sequentially connected, wherein air is connected to the air inlet side of the ammonia air mixer (11) through a dilution fan (8) and a dilution air heater (9), and an ammonia spraying grid (12), a flue guide plate and an SCR rectification grid are sequentially arranged in the SCR inlet flue according to the flue gas flow direction; the ammonia-containing product gas produced by the urea hydrolysis reactor (5) is input into a regulating and metering module (10).
2. The device for urea hydrolysis ammonia production and zoning accurate control ammonia injection according to claim 1, wherein a zoning ammonia adjusting system is arranged outside the ammonia injection grid (12), an accurate ammonia injection module is arranged inside the ammonia injection grid, and the accurate ammonia injection system is formed by the ammonia injection grid and a zoning synchronous measuring module arranged at the outlet of the SCR reactor and is controlled by a distributed control system DCS.
3. The device for producing ammonia by urea hydrolysis and accurately controlling ammonia injection in a partitioned manner according to claim 1 or 2, wherein a steam-water separation device is arranged in the urea hydrolysis reactor (5).
4. The device for urea hydrolysis ammonia production and zoning precise control ammonia injection according to claim 3, wherein an SCR catalyst and a catalyst module supporting beam are arranged in the SCR reactor, denitration reaction is carried out in the SCR reactor, and a flue gas automatic monitoring CEMS module is arranged at an outlet of the SCR reactor.
5. The device for urea hydrolysis ammonia production and zoning precise control ammonia injection according to claim 4, wherein the regulation metering module (10) is provided with an SCR zone metering regulation valve group.
6. The device for urea hydrolysis ammonia production and zone accurate control ammonia injection according to claim 5, characterized in that the catalyst used in the catalyst tank (6) is a phosphate mixture.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322555509.XU CN220878384U (en) | 2023-09-20 | 2023-09-20 | Device for preparing ammonia by urea hydrolysis and accurately controlling ammonia spraying in partitioned mode |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322555509.XU CN220878384U (en) | 2023-09-20 | 2023-09-20 | Device for preparing ammonia by urea hydrolysis and accurately controlling ammonia spraying in partitioned mode |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220878384U true CN220878384U (en) | 2024-05-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322555509.XU Active CN220878384U (en) | 2023-09-20 | 2023-09-20 | Device for preparing ammonia by urea hydrolysis and accurately controlling ammonia spraying in partitioned mode |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220878384U (en) |
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2023
- 2023-09-20 CN CN202322555509.XU patent/CN220878384U/en active Active
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