CN105883853A - Method for preparing ammonia with urea - Google Patents
Method for preparing ammonia with urea Download PDFInfo
- Publication number
- CN105883853A CN105883853A CN201610488914.6A CN201610488914A CN105883853A CN 105883853 A CN105883853 A CN 105883853A CN 201610488914 A CN201610488914 A CN 201610488914A CN 105883853 A CN105883853 A CN 105883853A
- Authority
- CN
- China
- Prior art keywords
- ammonia
- furnace chamber
- reaction furnace
- microwave
- urea
- 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.)
- Granted
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01C—AMMONIA; CYANOGEN; COMPOUNDS THEREOF
- C01C1/00—Ammonia; Compounds thereof
- C01C1/02—Preparation, purification or separation of ammonia
- C01C1/08—Preparation of ammonia from nitrogenous organic substances
- C01C1/086—Preparation of ammonia from nitrogenous organic substances from urea
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/64—Heating using microwaves
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Analytical Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Constitution Of High-Frequency Heating (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The invention provides a method for preparing ammonia with urea. The method is characterized by dissolving solid urea into a urea solution with mass percent of 35-60% by using desalted water, enabling the urea solution to enter a compressed air atomizer, enabling the atomized urea solution to enter a microwave reaction furnace chamber and generating microwaves with certain frequency by a magnetron in the reaction furnace chamber to instantaneously decompose the atomized urea solution into ammonia and a by-product thereof, wherein ammonia and the by-product thereof are fed into a warm water solution by an air pump to react to generate ammonia; the microwaves with certain frequency are generated in the reaction furnace chamber through the magnetron, and the powers of the microwaves in the reaction furnace chamber are more than 80mW/L; the temperature and pressure in the reaction furnace chamber are respectively 150-200 DEG C and 1.5-3.5MPa; the ammonia and the by-product thereof are fed into the water solution at a certain temperature by the pump and then are evaporated to obtain ammonia.
Description
Technical field
The invention belongs to the gas denitrifying technology field of Air Pollution prevention and control, particularly relate to a kind of method that ammonia prepared by carbamide.
Background technology
In order to prevent the pollution of environment, combustion product gases must go to denitrification (NO, NO2).The technique comparing main flow at present
Being divided into: SCR denitration and SNCR denitration, wherein SCR is the most ripe gas denitrifying technology, and it is a kind of furnace rear denitration,
This technology uses reducing agent NH3Source have 3 kinds: liquefied ammonia, ammonia and carbamide.Owing to liquefied ammonia is a kind of extremely dangerous chemistry
Product, along with country's pay attention to day by day to safety problem, put into effect a series of relevant restriction, use liquefied ammonia denitration the most loaded down with trivial details；
The limitation that ammonia is also applied because its operating cost is high as reducing agent denitration；Carbamide has avirulence, is easy to
The features such as transport, storage and be used widely.
The ultimate principle of carbamide ammonia is that urea liquid is decomposed at a certain temperature, containing carbon dioxide in its gas produced
(CO2), steam and ammonia (NH3).Different carbamide according to its temperature, pressure decompose can be divided into hydrolysis of urea and urea pyrolysis.
(1) hydrolysis of urea, concentration is the urea liquid of 40%～50% mass percent, delivers under a certain pressure hydrolyze heat exchange
Device decomposes at 100 DEG C 185 DEG C, and the most conventional method has: AOD method U2A method and SafeDeNOx method.But due to
Solve reactor higher due to operation temperature, course of reaction produces acidic materials in addition, makes equipment be more vulnerable to corrosion.Corrosion can
The leakage of equipment can be caused, thus produce potential safety hazard, the most also can cause the problems such as line clogging.
(2) urea pyrolysis, concentration is the urea liquid of 40%～50% mass percent, pyrolysis chamber's temperature 500 DEG C 600 DEG C
Under decompose, pyrolysis chamber generally utilizes diesel oil, combustion gas as thermal source, and therefore diesel oil, combustion gas usage amount are big, cause operation
Expense is high, the most extremely difficult control, and safety is low.
Although but both the above technology is improved by technical staff all can not overcome disadvantage mentioned above, for this reason, it may be necessary to a kind of new
The method of ammonia prepared by the carbamide of type.
Summary of the invention
The object of the invention, proposes a kind of method that ammonia prepared by carbamide, and the microwave being produced certain frequency by magnetron prepares ammonia
Method, make instantaneous ammonia and by-product thereof, ammonia and the by-product thereof of resolving into of the urea liquid after atomization be pumped into by air pump
Enter the aqueous solution of uniform temperature reacts further and generate ammonia.
Technical scheme, a kind of carbamide is prepared the method for ammonia, is used the urea liquid of certain mass percent to enter pressure
Contracting air atomizing device, the urea liquid after atomization enters in microwave reaction furnace chamber, is produced certain in reaction furnace chamber by magnetron
The microwave of frequency, makes instantaneous ammonia and by-product thereof, ammonia and the by-product thereof of resolving into of the urea liquid after atomization pass through air pump
It is pumped in the aqueous solution of uniform temperature reaction further and generates ammonia；
Use the urea liquid of certain mass percent, use demineralized water (after ion exchange) that dense for solid urea solution is become quality hundred
Proportion by subtraction is 35%-60% urea liquid.
Produced the microwave of certain frequency in reaction furnace chamber by magnetron, frequency is 900MHz-2500MHz；The power of microwave is wanted
More than every liter more than 80mW.
Temperature 150 DEG C 200 DEG C in reaction furnace chamber, pressure 1.5MPa 3.5MPa.
Ammonia and by-product thereof are by being pumped into the aqueous solution of uniform temperature (such as more than 70 DEG C), if temperature is 70 DEG C 100 DEG C.
Obtaining ammonia after evaporation, its volumetric concentration is more than 90%.More than 70 DEG C solution of ammonia dissolve the lowest, and other gas can be molten
In hot water.
Beneficial effect: the present invention prepares carbamide by the microwave method of certain power, overcomes hydrolysis of urea and urea pyrolysis preparation urine
The deficiency of element, equipment requirements is low, and cost of investment is low, obtains ammonia concentration and is higher than upper two kinds of methods, and prepare on the whole after evaporation
Low cost, therefore advantage is the most obvious in application.Make that the urea liquid after atomization microwave is instantaneous resolves into ammonia and by-product thereof,
Ammonia and by-product thereof are pumped in the deionized water solution of uniform temperature reaction further by air pump and generate ammonia.The present invention
The method being produced ammonia by microwave heating efficiently solves the defect that conventional urea uses pyrolysismethod and Hydrolyze method to bring.
Accompanying drawing explanation
Fig. 1 is the principle i.e. control structure block diagram that ammonia prepared by the carbamide that the embodiment of the present invention provides.
Detailed description of the invention
In order to make the purpose of the present invention, technical scheme and advantage clearer, below in conjunction with embodiment, the present invention is carried out
Further describe.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not used to limit
The present invention.
Enforcement one:
Using the demineralized water after ion-exchange treatment that solid urea is dissolved into mass percent is 45% urea liquid, by compression
Air atomizing device, enters in microwave reaction furnace chamber, and reaction furnace chamber (can be the reaction chamber of cylinder or rectangle, in reaction chamber
Being evenly arranged the magnetron producing microwave, the power of every magnetron is 0.8-3000W)；2450MHz is produced by magnetron
Microwave, the compounding substances after air pump abstraction reaction, entering temperature is in the deionized water of 90 DEG C, obtains ammonia after evaporation.
Reaction chamber every liter 300mW-2000mW time actually used.
Enforcement two:
Using the demineralized water after ion-exchange treatment that solid urea is dissolved into mass percent is 60% urea liquid, by compression
Air atomizing device, enters microwave reaction furnace chamber and (can be the reaction chamber of cylinder or rectangle, be evenly arranged generation in reaction chamber
The magnetron of microwave, the power of every magnetron is 0.8-3000W) in, the microwave of 950MHz is produced by some magnetrons,
Compounding substances after air pump abstraction reaction, enters in the deionized water that temperature is 95 DEG C, obtains ammonia after evaporation.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all spirit in the present invention and former
Any amendment, equivalent and the improvement etc. made within then, should be included within the scope of the present invention.
Claims (4)
1. the method that ammonia prepared by carbamide, is characterized in that using demineralized water that dense for solid urea solution becomes mass percent be
35%-60% urea liquid enters compressed air atomising device, and the urea liquid after atomization enters in microwave reaction furnace chamber, reacting furnace
Chamber is produced by magnetron the microwave of certain frequency, makes that the urea liquid after atomization is instantaneous resolves into ammonia and by-product thereof, ammonia
Gas and by-product thereof are pumped in the aqueous solution of uniform temperature reaction further by air pump and generate ammonia；Reaction furnace chamber passes through
Magnetron produces the microwave of certain frequency, and the power of reaction furnace chamber microwave is greater than every liter more than 80mW；Temperature in reaction furnace chamber
150 DEG C 200 DEG C, pressure 1.5MPa 3.5MPa；Ammonia and by-product thereof are by evaporating after being pumped into the aqueous solution of uniform temperature
After obtain ammonia.
The method of ammonia prepared by carbamide the most according to claim 1, it is characterized in that being pumped in 70 DEG C of 100 DEG C of aqueous solutions.
The method of ammonia prepared by carbamide the most according to claim 1, it is characterized in that being produced by magnetron in reaction furnace chamber
The microwave of certain frequency, frequency is 900MHz-2500MHz.
The method of ammonia prepared by carbamide the most according to claim 1, it is characterized in that reacting furnace chamber in microwave reaction furnace chamber micro-
The power every liter 300mW-5000mW of ripple.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610488914.6A CN105883853B (en) | 2016-06-28 | 2016-06-28 | A kind of method that urea prepares ammonia |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610488914.6A CN105883853B (en) | 2016-06-28 | 2016-06-28 | A kind of method that urea prepares ammonia |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105883853A true CN105883853A (en) | 2016-08-24 |
| CN105883853B CN105883853B (en) | 2019-01-04 |
Family
ID=56719127
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610488914.6A Expired - Fee Related CN105883853B (en) | 2016-06-28 | 2016-06-28 | A kind of method that urea prepares ammonia |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105883853B (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114115390A (en) * | 2020-08-28 | 2022-03-01 | 陕西青朗万城环保科技有限公司 | Urea pyrolysis method based on microwaves and control system thereof |
| CN114177861A (en) * | 2020-09-12 | 2022-03-15 | 陕西青朗万城环保科技有限公司 | Method for preparing ammonia gas by urea solution microwave ultraviolet photolysis and control system thereof |
| CN114247287A (en) * | 2020-09-19 | 2022-03-29 | 陕西青朗万城环保科技有限公司 | Urea pyrolysis process and device thereof |
| CN114247400A (en) * | 2020-09-19 | 2022-03-29 | 陕西青朗万城环保科技有限公司 | Urea pyrolysis process and device thereof |
| CN114247401A (en) * | 2020-09-21 | 2022-03-29 | 陕西青朗万城环保科技有限公司 | Microwave urea pyrolysis method and control system thereof |
| CN114345265A (en) * | 2020-10-12 | 2022-04-15 | 陕西青朗万城环保科技有限公司 | Method for hydrolyzing urea based on microwaves |
| CN114433157A (en) * | 2020-10-30 | 2022-05-06 | 陕西青朗万城环保科技有限公司 | Urea microwave hydrolysis catalyst and preparation method thereof |
| CN114436290A (en) * | 2020-10-30 | 2022-05-06 | 陕西青朗万城环保科技有限公司 | Method for preparing ammonia gas based on microwave hydrolysis of urea |
| CN114455606A (en) * | 2020-11-09 | 2022-05-10 | 陕西青朗万城环保科技有限公司 | System and process for preparing ammonia based on microwave urea hydrolysis |
| CN114488959A (en) * | 2020-10-23 | 2022-05-13 | 陕西青朗万城环保科技有限公司 | Urea microwave ammonia production method and control system thereof |
| CN114516645A (en) * | 2020-11-19 | 2022-05-20 | 陕西青朗万城环保科技有限公司 | Method for pyrolyzing urea by microwaves and control system thereof |
Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101125666A (en) * | 2007-08-24 | 2008-02-20 | 中电投远达环保工程有限公司 | Technique for preparing ammonia from urea by pyrolysis method |
| CN101327936A (en) * | 2008-07-04 | 2008-12-24 | 石家庄新世纪煤化实业集团有限公司 | Ammonia gas reclaiming double tower distil process |
| CN101734685A (en) * | 2009-12-17 | 2010-06-16 | 北京博奇电力科技有限公司 | Method for ammonia quantitative production and denitration by carbamide |
| CN101870480A (en) * | 2010-06-25 | 2010-10-27 | 中环（中国）工程有限公司 | Method for preparing ammonia gas from urea solid by dry pyrolysis |
| CN202729821U (en) * | 2012-02-27 | 2013-02-13 | 环境保护部华南环境科学研究所 | Electric pyrolytic urea solution device and electric pyrolytic urea solution ammonia generating device thereof |
| CN103214047A (en) * | 2013-04-23 | 2013-07-24 | 清华大学 | Method for recycling NH3-N from ammoninted waste liquid |
| CN103936029A (en) * | 2014-04-18 | 2014-07-23 | 西安交通大学 | Fluidized bed reactor for preparing ammonia by virtue of pyrolysis of urea |
| CN104003417A (en) * | 2013-04-19 | 2014-08-27 | 中国大唐集团环境技术有限公司 | Reverse-flow device and method for preparing ammonia by urea pyrolysis |
| CN203829923U (en) * | 2014-05-15 | 2014-09-17 | 北京洛卡环保技术有限公司 | Ejector for preparing ammonia by urea pyrolysis |
| CN204469547U (en) * | 2014-12-31 | 2015-07-15 | 浙江百能科技有限公司 | A kind of high-temperature flue gas that adopts is as the urea pyrolysis ammonia device of thermal source |
| CN104891529A (en) * | 2015-06-24 | 2015-09-09 | 田鹏程 | System and method for producing ammonia with urea by direct injection and thermal decomposition |
| CN205019746U (en) * | 2015-10-08 | 2016-02-10 | 天津普利奥能源技术发展有限公司 | Aqueous ammonia evaporimeter |
-
2016
- 2016-06-28 CN CN201610488914.6A patent/CN105883853B/en not_active Expired - Fee Related
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101125666A (en) * | 2007-08-24 | 2008-02-20 | 中电投远达环保工程有限公司 | Technique for preparing ammonia from urea by pyrolysis method |
| CN101327936A (en) * | 2008-07-04 | 2008-12-24 | 石家庄新世纪煤化实业集团有限公司 | Ammonia gas reclaiming double tower distil process |
| CN101734685A (en) * | 2009-12-17 | 2010-06-16 | 北京博奇电力科技有限公司 | Method for ammonia quantitative production and denitration by carbamide |
| CN101870480A (en) * | 2010-06-25 | 2010-10-27 | 中环（中国）工程有限公司 | Method for preparing ammonia gas from urea solid by dry pyrolysis |
| CN202729821U (en) * | 2012-02-27 | 2013-02-13 | 环境保护部华南环境科学研究所 | Electric pyrolytic urea solution device and electric pyrolytic urea solution ammonia generating device thereof |
| CN104003417A (en) * | 2013-04-19 | 2014-08-27 | 中国大唐集团环境技术有限公司 | Reverse-flow device and method for preparing ammonia by urea pyrolysis |
| CN103214047A (en) * | 2013-04-23 | 2013-07-24 | 清华大学 | Method for recycling NH3-N from ammoninted waste liquid |
| CN103936029A (en) * | 2014-04-18 | 2014-07-23 | 西安交通大学 | Fluidized bed reactor for preparing ammonia by virtue of pyrolysis of urea |
| CN203829923U (en) * | 2014-05-15 | 2014-09-17 | 北京洛卡环保技术有限公司 | Ejector for preparing ammonia by urea pyrolysis |
| CN204469547U (en) * | 2014-12-31 | 2015-07-15 | 浙江百能科技有限公司 | A kind of high-temperature flue gas that adopts is as the urea pyrolysis ammonia device of thermal source |
| CN104891529A (en) * | 2015-06-24 | 2015-09-09 | 田鹏程 | System and method for producing ammonia with urea by direct injection and thermal decomposition |
| CN205019746U (en) * | 2015-10-08 | 2016-02-10 | 天津普利奥能源技术发展有限公司 | Aqueous ammonia evaporimeter |
Non-Patent Citations (3)
| Title |
|---|
| A.JOHN BLACKER: "《制药工艺开发》", 31 January 2016, 华东理工大学出版社 * |
| 毛志伟: "《氮氧化物减排》", 31 August 2014, 中国建材工业出版社 * |
| 潘婷婷等: "微波介电加热下尿素的分解动力学", 《第一届全国化学工程与生物化工年会论文集》 * |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114115390A (en) * | 2020-08-28 | 2022-03-01 | 陕西青朗万城环保科技有限公司 | Urea pyrolysis method based on microwaves and control system thereof |
| CN114177861A (en) * | 2020-09-12 | 2022-03-15 | 陕西青朗万城环保科技有限公司 | Method for preparing ammonia gas by urea solution microwave ultraviolet photolysis and control system thereof |
| CN114247287A (en) * | 2020-09-19 | 2022-03-29 | 陕西青朗万城环保科技有限公司 | Urea pyrolysis process and device thereof |
| CN114247400A (en) * | 2020-09-19 | 2022-03-29 | 陕西青朗万城环保科技有限公司 | Urea pyrolysis process and device thereof |
| CN114247401A (en) * | 2020-09-21 | 2022-03-29 | 陕西青朗万城环保科技有限公司 | Microwave urea pyrolysis method and control system thereof |
| CN114345265A (en) * | 2020-10-12 | 2022-04-15 | 陕西青朗万城环保科技有限公司 | Method for hydrolyzing urea based on microwaves |
| CN114488959A (en) * | 2020-10-23 | 2022-05-13 | 陕西青朗万城环保科技有限公司 | Urea microwave ammonia production method and control system thereof |
| CN114433157A (en) * | 2020-10-30 | 2022-05-06 | 陕西青朗万城环保科技有限公司 | Urea microwave hydrolysis catalyst and preparation method thereof |
| CN114436290A (en) * | 2020-10-30 | 2022-05-06 | 陕西青朗万城环保科技有限公司 | Method for preparing ammonia gas based on microwave hydrolysis of urea |
| CN114455606A (en) * | 2020-11-09 | 2022-05-10 | 陕西青朗万城环保科技有限公司 | System and process for preparing ammonia based on microwave urea hydrolysis |
| CN114516645A (en) * | 2020-11-19 | 2022-05-20 | 陕西青朗万城环保科技有限公司 | Method for pyrolyzing urea by microwaves and control system thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105883853B (en) | 2019-01-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105883853A (en) | Method for preparing ammonia with urea | |
| RU2193442C2 (en) | Flue gas treatment method | |
| JP3361200B2 (en) | Exhaust gas treatment method and equipment for electron beam irradiation | |
| CN102190341B (en) | Stripping ammonia-removing method based on flash evaporation and heat pump technologies | |
| Liu et al. | Simultaneous absorption–oxidation of nitric oxide and sulfur dioxide using ammonium persulfate synergistically activated by UV-light and heat | |
| CN102772996B (en) | Ammonia nitrogen processing method in processing of waste gas of chemical fertilizer plant | |
| CN103723895A (en) | Method for treating industrial wastewater through subcritical water oxidation process in combination with biochemical process | |
| CN109626684B (en) | Treatment device and process for high-nitrate wastewater | |
| CN103933831B (en) | A kind of recovery method producing ammonia in 4-5 amido benzotrifluoride technique | |
| CN103961991B (en) | A kind for the treatment of fluid for the treatment of nitrogen oxides of exhaust gas | |
| CN102674287A (en) | Method for producing ammonium polyphosphate flame retardant by utilizing melamine tail gas | |
| CN206375773U (en) | A kind of high ammonia-nitrogen sewage treatment system | |
| CN101734685A (en) | Method for ammonia quantitative production and denitration by carbamide | |
| CN203474477U (en) | Vapor recycling system for multi-hole ammonium nitrate production process | |
| CN103570044A (en) | Method for processing waste mixed liquid of sodium sulfate and ammonium sulfate by using carbonate | |
| CN103030235A (en) | Ammonia-nitrogen wastewater treatment method | |
| CN103058190B (en) | Harmlessness treatment method for freon | |
| CN109052411A (en) | A kind of recycling and harmless treatment device and method of industry dangerous waste | |
| CN204429102U (en) | A kind of utilization in the urea liquid flue of SCR system directly sprays pyrolysis installation | |
| CN111701432B (en) | Denitration desulfurizer and preparation method thereof | |
| CN113101783A (en) | System for separating ammonia production gas produced by urea hydrolysis for chemical ammonia adding system | |
| CN102838246B (en) | Method for treating ammonia-nitrogen wastewater by thermal decomposition and application of method | |
| CN104477939B (en) | Low-pressure hydrolysis technology | |
| CN113083004A (en) | Be applicable to well low temperature SCR denitration aqueous ammonia direct injection device | |
| CN218879516U (en) | Ammonia nitrogen wastewater treatment and resource recovery device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190104 Termination date: 20190628 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |