CN214141606U - Urea catalytic hydrolysis ammonia preparation denitration process units - Google Patents
Urea catalytic hydrolysis ammonia preparation denitration process units Download PDFInfo
- Publication number
- CN214141606U CN214141606U CN202023225884.0U CN202023225884U CN214141606U CN 214141606 U CN214141606 U CN 214141606U CN 202023225884 U CN202023225884 U CN 202023225884U CN 214141606 U CN214141606 U CN 214141606U
- Authority
- CN
- China
- Prior art keywords
- urea
- catalytic hydrolysis
- hydrolysis reactor
- evaporation
- recoverer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 title claims abstract description 91
- 239000004202 carbamide Substances 0.000 title claims abstract description 90
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 title claims abstract description 51
- 238000006460 hydrolysis reaction Methods 0.000 title claims abstract description 44
- 230000007062 hydrolysis Effects 0.000 title claims abstract description 43
- 230000003197 catalytic effect Effects 0.000 title claims abstract description 34
- 229910021529 ammonia Inorganic materials 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 title claims abstract description 14
- 230000008569 process Effects 0.000 title claims abstract description 13
- 238000002360 preparation method Methods 0.000 title claims abstract description 11
- 238000001704 evaporation Methods 0.000 claims abstract description 20
- 230000008020 evaporation Effects 0.000 claims abstract description 20
- 238000003860 storage Methods 0.000 claims description 17
- 238000005507 spraying Methods 0.000 claims description 8
- 238000004090 dissolution Methods 0.000 claims description 2
- 239000007921 spray Substances 0.000 abstract description 5
- 230000008901 benefit Effects 0.000 abstract description 3
- 238000011084 recovery Methods 0.000 abstract 4
- 230000002265 prevention Effects 0.000 abstract 1
- 239000003054 catalyst Substances 0.000 description 13
- 238000005516 engineering process Methods 0.000 description 9
- 239000000243 solution Substances 0.000 description 7
- 239000007787 solid Substances 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 5
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 3
- 239000002351 wastewater Substances 0.000 description 3
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- 238000006555 catalytic reaction Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000000197 pyrolysis Methods 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- 239000011949 solid catalyst Substances 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- LFVGISIMTYGQHF-UHFFFAOYSA-N ammonium dihydrogen phosphate Chemical compound [NH4+].OP(O)([O-])=O LFVGISIMTYGQHF-UHFFFAOYSA-N 0.000 description 1
- 229910000387 ammonium dihydrogen phosphate Inorganic materials 0.000 description 1
- 235000011114 ammonium hydroxide Nutrition 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 235000019837 monoammonium phosphate Nutrition 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000036632 reaction speed Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000004408 titanium dioxide Substances 0.000 description 1
Images
Landscapes
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
The utility model provides a urea catalytic hydrolysis ammonia preparation denitration process units, dissolve the holding vessel by urea, urea catalytic hydrolysis reactor, evaporation recovery ware and drain box link to each other and form, urea dissolves the lower part in the holding vessel is equipped with steam coil A, the middle part is equipped with the agitator, the outside urea spray tube bank of upper end meets, urea catalytic hydrolysis reactor upper portion has connect ammonia outlet and relief valve, the urea conveyer pipe meets with the air pump through valve one end, the other end meets with urea catalytic hydrolysis reactor, evaporation recovery ware has met urea spray tube bank, and the lower part through pump A and urea catalytic hydrolysis reactor links to each other, be equipped with steam coil B in the evaporation recovery ware, termination has the spiral to arrange the machine under the evaporation recovery ware, the drain box meets with the drain pipe that sets up the steam coil C in urea catalytic hydrolysis reactor. Has the advantages of simple process system and secondary pollution prevention.
Description
Technical Field
The utility model belongs to the technical field of industry flue gas SCR denitration, a urea catalysis hydrolysis ammonia preparation denitration process units is related to.
Background
The SCR denitration technology generally adopts liquid ammonia (NH)3) Ammonia water (NH)4OH), urea (CO (NH)2)2) And the like to prepare the reducing agent ammonia. Compared with liquid ammonia, the urea has the advantages of high transportation, storage and use safety, so that the urea-to-ammonia process has a popularization prospect. The technology for preparing ammonia from urea is divided into the technology for preparing ammonia from urea by pyrolysis and the technology for preparing ammonia by urea hydrolysis. The urea hydrolysis ammonia preparation technology is divided into a common urea hydrolysis ammonia preparation technology and a urea catalytic hydrolysis ammonia preparation technology.
The technology for preparing ammonia by urea catalytic hydrolysis is as follows: under the action of catalyst, the urea in molten state is quickly hydrolyzed at the temperature of 130-150 deg.c and pressure of 0.35-0.55 MPa. Compared with the common urea hydrolysis method, the reaction speed can be improved by more than 10 times, the response time can reach within 1 minute, and the energy consumption is about half of that of the pyrolysis technology. The reaction principle of urea catalytic hydrolysis for preparing ammonia is as follows:
(NH2)2CO+H2O＝CO2↑+2NH3↑
the catalyst has the functions of changing the reaction path, accelerating the reaction rate and reducing the response time. Generally, solid particle catalysts such as ammonium dihydrogen phosphate, titanium dioxide and the like are adopted, and the catalytic hydrolysis reactor is put into recycling use when being started for the first time and is discharged to a wastewater pool when being overhauled or emptied.
The traditional urea catalytic hydrolysis ammonia production system comprises a urea dissolving preparation system, a urea solution storage system, a urea catalytic hydrolysis reactor system, a catalyst preparing, dissolving and conveying system, a wastewater discharge system and the like. Because the catalyst does not participate in the reaction, the invalid catalyst is periodically and externally hung to a wastewater disposal basin through a hydrolyzer, residual liquid discharged by the hydrolysis of common urea can be greened, and if the catalyst is contained, secondary pollution is easily caused, so that the use of the catalyst is limited.
Disclosure of Invention
The utility model provides a urea catalysis hydrolysis ammonia denitration process units to ordinary urea hydrolysis reaction shortcoming.
The technical solution of the utility model is that: the utility model provides a urea catalytic hydrolysis ammonia preparation denitration process units, is formed by urea dissolution holding vessel, urea catalytic hydrolysis reactor, evaporation recoverer and drain tank link to each other, its characterized in that: the urea dissolving storage tank is internally provided with a steam coil A at the lower part, a stirrer at the middle part, an external urea spraying pipe bundle at the upper end, an air pump at the front end of the urea spraying pipe bundle, an ammonia outlet and a pressure release valve at the upper part of the urea catalytic hydrolysis reactor, a urea conveying pipe connected with the air pump through one end of a valve and the urea catalytic hydrolysis reactor at the other end of the urea spraying pipe bundle, an evaporation recoverer connected with the urea spraying pipe bundle at the upper end and connected with the lower part of the urea catalytic hydrolysis reactor through the pump A, the evaporation recoverer is internally provided with a steam coil B, a drain pipe at the lower end of the evaporation recoverer is connected with a drain tank, the lower part of the urea dissolving storage tank is connected with the lower part of the urea catalytic hydrolysis reactor through the pump B and a pipeline, the lower part of the urea dissolving storage tank and the lower end of the evaporation recoverer are connected with pipelines.
Compared with the prior art, the utility model have following advantage:
1. adopt air pump, urea to dissolve holding vessel, urea catalytic hydrolysis reactor, evaporation recoverer, drain trap combination process units, compare traditional process units, simple and practical. The storage tank integrates urea dissolving and storage, a common hydrolysis bucket elevator, a urea storage room, a urea dissolving tank and urea mixing and feeding pump equipment are omitted, urea is pumped to the storage tank by an air pump and a spray pipe bundle, and a direct stirrer assists steam heating, dissolving and storage; the ordinary catalytic hydrolysis catalyst dissolving and storing link is cancelled, and the catalyst is conveyed and supplemented to the hydrolyzer by an air pump at regular intervals.
2. The air pump is adopted to convey the solid urea and the solid catalyst, the intermittent alternate operation is carried out, the dissolving and conveying link is eliminated, the process is simple, the equipment is less, and the occupied area is saved.
3. An evaporation recoverer is adopted to recover the spent catalyst, the solid spent catalyst is recovered, and the concentrated solution flows back to the storage tank, so that direct discharge in the traditional mode is avoided, and secondary pollution of the catalyst is avoided.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
In the figure: 1. urea dissolves the holding vessel, 2, urea catalytic hydrolysis reactor, 3, evaporation recoverer, 4, drain trap, 5, air pump, 6, urea shower bundle, 7, agitator, 8, steam coil A, 9, pump A, 10, spiral row of material machine, 11, valve, 12, steam coil B, 13 steam coil C, 14, relief valve, 15, ammonia export, 16, pump B.
Detailed Description
The embodiments are described below with reference to the accompanying drawings:
a denitration process device for ammonia preparation by urea catalytic hydrolysis comprises a urea dissolving storage tank 1, a urea catalytic hydrolysis reactor 2, an evaporation recoverer 3, a drain tank 4, an air pump 5, a urea spray pipe bundle 6, a stirrer 7, a steam coil A8, a pump A9, a spiral discharger 10, a valve 11, a steam coil B12, a steam coil C13, a pressure release valve 14, an ammonia outlet 15 and a pump B16.
Pumping solid urea into a urea dissolving storage tank 1 by an air pump 5 and a urea spraying pipe bundle 6, stirring and dissolving the solid urea in an aqueous solution by a stirrer 7, heating the solution to 60-80 ℃ by auxiliary steam of a steam coil A8 to dissolve the solid urea, and storing the dissolved urea solution with the concentration of about 50% in a storage tank for 5-7 days; the solution is pumped to a urea catalytic hydrolysis reactor 2 by a pump B16 for hydrolysis, steam enters a steam coil C13 and is hydrolyzed with the urea solution under the condition of 145-155 ℃ for heat exchange to generate ammonia gas, and the ammonia gas is sent to a furnace area for denitration reaction from an ammonia gas outlet 15; when the urea catalytic hydrolysis reactor 2 is overhauled or periodically discharges sewage, the sewage is discharged from the bottom and is sprayed into the evaporation recoverer 3 by the pump A9 through the spray pipe bundle, the heat is exchanged by the steam coil B12, the generated solid catalyst falls into the spiral discharging machine 10 to be discharged and recovered, and the unevaporated concentrated liquid is pumped to the urea dissolving storage tank 1 to be recycled, so that zero emission is realized.
Claims (1)
1. The utility model provides a urea catalytic hydrolysis ammonia preparation denitration process units, is formed by urea dissolution holding vessel (1), urea catalytic hydrolysis reactor (2), evaporation recoverer (3) and drain box (4) link to each other, its characterized in that: the urea dissolving and storing tank (1) is provided with a steam coil A (8) at the lower part and a stirrer (7) at the middle part, the upper end of the urea dissolving and storing tank is connected with an external urea spraying pipe bundle (6), the front end of the urea spraying pipe bundle (6) is connected with an air pump (5), the upper part of the urea catalytic hydrolysis reactor (2) is connected with an ammonia outlet (15) and a pressure relief valve (14), one end of a urea conveying pipe is connected with the air pump (5) through a valve (11), the other end of the urea conveying pipe is connected with the urea catalytic hydrolysis reactor (2), the upper end of the evaporation recoverer (3) is connected with the urea spraying pipe bundle (6) and is connected with the lower part of the urea catalytic hydrolysis reactor (2) through a pump A (9), the evaporation recoverer (3) is internally provided with a steam coil B (12), a drain pipe at the lower end of the evaporation recoverer is connected with a drain tank (4), the lower end of the evaporation recoverer (3) is connected with a spiral discharger (10), the device is characterized in that the drain box (4) is connected with a drain pipe of a steam coil C (13) arranged in the urea catalytic hydrolysis reactor (2), the lower part of the urea dissolving storage tank (1) is connected with the lower part of the urea catalytic hydrolysis reactor (2) through a pump B (16) and a pipeline, and the lower part of the urea dissolving storage tank (1) and the lower end of the evaporation recoverer (3) are connected with a pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023225884.0U CN214141606U (en) | 2020-12-28 | 2020-12-28 | Urea catalytic hydrolysis ammonia preparation denitration process units |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023225884.0U CN214141606U (en) | 2020-12-28 | 2020-12-28 | Urea catalytic hydrolysis ammonia preparation denitration process units |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214141606U true CN214141606U (en) | 2021-09-07 |
Family
ID=77542608
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202023225884.0U Active CN214141606U (en) | 2020-12-28 | 2020-12-28 | Urea catalytic hydrolysis ammonia preparation denitration process units |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214141606U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114505044A (en) * | 2022-02-23 | 2022-05-17 | 西安热工研究院有限公司 | Filling type urea catalytic hydrolysis system and method |
-
2020
- 2020-12-28 CN CN202023225884.0U patent/CN214141606U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114505044A (en) * | 2022-02-23 | 2022-05-17 | 西安热工研究院有限公司 | Filling type urea catalytic hydrolysis system and method |
| CN114505044B (en) * | 2022-02-23 | 2023-10-20 | 西安热工研究院有限公司 | Filling urea catalytic hydrolysis system and method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN113511659A (en) | Urea hydrolysis ammonia production device and method for denitration of flue gas of thermal power plant | |
| CN107585815A (en) | A kind of high-concentration ammonia nitrogenous wastewater cooperates with the method and system administered with flue gas of refuse burning NOx pollutants | |
| CN214141606U (en) | Urea catalytic hydrolysis ammonia preparation denitration process units | |
| CN113750948A (en) | Urea catalytic hydrolysis reactor and method for flue gas denitration | |
| CN212576008U (en) | Purification device for removing SNCR and SCR escaped ammonia | |
| CN112678847A (en) | Urea coupling hydrolyzer and urea coupling hydrolysis method thereof | |
| CN211612176U (en) | Hydrogen chloride tail gas absorbing device of by-product high concentration hydrochloric acid | |
| CN207276728U (en) | A kind of stainless steel is continuously without the nitric acid acidwashing circulatory system | |
| CN207929003U (en) | A kind of novel denitration system of power plant | |
| CN214880263U (en) | Urea hydrolysis ammonia production cauldron bottom liquid utilization system | |
| CN217568668U (en) | Urea catalytic hydrolysis ammonia production system | |
| CN214210014U (en) | Ammonia-to-urea hydrolysis ammonia preparation denitration process device | |
| CN107875854A (en) | A kind of denitrification apparatus for power plant | |
| CN111167276B (en) | Denitration method in alkali recovery furnace | |
| CN208449035U (en) | A kind of SNCR denitration system | |
| CN217909786U (en) | Urea catalytic hydrolysis ammonia production system for thermal power plant flue gas denitration | |
| CN219355852U (en) | SCR denitration system for preparing ammonia by catalyzing urea hydrolysis based on flue gas waste heat | |
| CN217220881U (en) | UTG flue gas processing system in manufacturing | |
| CN216259992U (en) | Useless deacidification processing system that burns of danger | |
| CN205461764U (en) | Novel little spray gun SNCR+ ozone flue gas denitration device | |
| CN217248844U (en) | Urea hydrolysis device and control system of online deironing | |
| CN214344909U (en) | Kettle bottom liquid treatment system for urea hydrolysis ammonia production | |
| CN214808549U (en) | Device for separating biuret from urea hydrolysate | |
| CN211864462U (en) | Environment-friendly hydrochloric acid absorption system | |
| CN207929004U (en) | A kind of denitrification apparatus for power plant |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: A process unit for ammonia production and denitrification by catalytic hydrolysis of urea Effective date of registration: 20221212 Granted publication date: 20210907 Pledgee: Dalian Branch of Shanghai Pudong Development Bank Co.,Ltd. Pledgor: DALIAN BEST ENVIRONMENT EQUIPMENT Co.,Ltd. Registration number: Y2022980026415 |
|
| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PC01 | Cancellation of the registration of the contract for pledge of patent right |
Date of cancellation: 20240103 Granted publication date: 20210907 Pledgee: Dalian Branch of Shanghai Pudong Development Bank Co.,Ltd. Pledgor: DALIAN BEST ENVIRONMENT EQUIPMENT Co.,Ltd. Registration number: Y2022980026415 |
|
| PC01 | Cancellation of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: A process device for catalytic hydrolysis of urea to produce ammonia and denitrification Granted publication date: 20210907 Pledgee: Dalian Branch of Shanghai Pudong Development Bank Co.,Ltd. Pledgor: DALIAN BEST ENVIRONMENT EQUIPMENT Co.,Ltd. Registration number: Y2024980001872 |
|
| PE01 | Entry into force of the registration of the contract for pledge of patent right |