CN105883853B - A kind of method that urea prepares ammonia - Google Patents
A kind of method that urea prepares ammonia Download PDFInfo
- Publication number
- CN105883853B CN105883853B CN201610488914.6A CN201610488914A CN105883853B CN 105883853 B CN105883853 B CN 105883853B CN 201610488914 A CN201610488914 A CN 201610488914A CN 105883853 B CN105883853 B CN 105883853B
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- ammonia
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- urea
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- 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
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- 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
A kind of method that urea prepares ammonia, the dense solution of solid urea is entered into compressed air atomising device at mass percent for 35%-60% urea liquid using demineralized water, urea liquid after atomization enters in microwave reaction furnace chamber, react the microwave for generating certain frequency in furnace chamber by magnetron, urea liquid after making atomization instantaneously resolves into ammonia and its by-product, and ammonia and its by-product are pumped into reaction in warm water solution by aspiration pump and generate ammonia；The microwave for generating certain frequency in furnace chamber by magnetron is reacted, the power of reaction furnace chamber microwave is greater than every liter and is greater than 80mW；150 DEG C -200 DEG C of furnace chamber medium temperature degree of reaction, pressure 1.5MPa -3.5MPa；Ammonia and its by-product are pumped into evaporate after the aqueous solution of certain temperature after obtain ammonia.
Description
Technical field
The invention belongs to the sides that the gas denitrifying technology field of Air Pollution prevention and control more particularly to a kind of urea prepare ammonia
Method.
Background technique
The pollution of environment in order to prevent must remove denitrification (NO, NO in combustion product gases2).Compare mainstream at present
Technique is divided into: SCR denitration and SNCR denitration, and wherein SCR is most mature gas denitrifying technology at present, it is taken off after a kind of furnace
Nitre, the technology use reducing agent NH3Source have 3 kinds: liquefied ammonia, ammonium hydroxide and urea.Since liquefied ammonia is a kind of extremely dangerousization
Product put into effect a series of relevant restrictions as country is to the pay attention to day by day of safety problem, very numerous using liquefied ammonia denitration
It is trivial；Ammonium hydroxide as reducing agent denitration also because its operating cost is high and by the limitation applied；Urea have it is non-toxic,
The features such as being readily transported, storing and be used widely.
The basic principle of urea ammonia is that urea liquid is decomposed at a certain temperature, contains two in the gas generated
Carbonoxide (CO2), vapor and ammonia (NH3).Hydrolysis of urea and urine can be divided into according to the decomposition of the different urea of its temperature, pressure
Element pyrolysis.
(1) hydrolysis of urea, concentration are the urea liquid of 40%~50% mass percent, are sent under a certain pressure to hydrolysis
Heat exchanger is decomposed at 100 DEG C -185 DEG C, and currently used method has: AOD method U2A method and SafeDeNOx method.But by
In solution reactor since operation temperature is higher, acidic materials are generated in reaction process in addition, equipment is made to be more vulnerable to corrode.Corrosion
It may cause the leakage of equipment, to generate security risk, while the problems such as also will cause line clogging.
(2) urea pyrolysis, concentration are the urea liquid of 40%~50% mass percent, in pyrolysis 500 DEG C of room temperature-
It is decomposed at 600 DEG C, pyrolysis chamber is usually using diesel oil, combustion gas as heat source, therefore diesel oil, combustion gas usage amount are big, cause to transport
Capable expense is high, while extremely difficult control, safety are low.
Disadvantage mentioned above cannot be overcome although technical staff improves both the above technology, for this reason, it may be necessary to one
The method that the novel urea of kind prepares ammonia.
Summary of the invention
The object of the invention proposes a kind of method that urea prepares ammonia, and the microwave system of certain frequency is generated by magnetron
The method of standby ammonia, the urea liquid after making atomization instantaneously resolve into ammonia and its by-product, and ammonia and its by-product pass through pumping
Air pump is pumped into the aqueous solution of certain temperature further reaction and generates ammonia.
A kind of technical solution of the present invention, method that urea prepares ammonia, uses the urea liquid of certain mass percent
Into compressed air atomising device, the urea liquid after atomization enters in microwave reaction furnace chamber, reacts in furnace chamber and passes through magnetron
The microwave for generating certain frequency, the urea liquid after making atomization instantaneously resolve into ammonia and its by-product, ammonia and its by-product
Further reaction, which is pumped into the aqueous solution of certain temperature, by aspiration pump generates ammonia；
Using the urea liquid of certain mass percent, using demineralized water (after ion exchange) by the dense solution of solid urea at matter
Amount percentage is 35%-60% urea liquid.
React the microwave for generating certain frequency in furnace chamber by magnetron, frequency 900MHz-2500MHz；The function of microwave
Rate is greater than every liter and is greater than 80mW.
150 DEG C -200 DEG C of furnace chamber medium temperature degree of reaction, pressure 1.5MPa -3.5MPa.
Ammonia and its by-product are pumped into the aqueous solution of certain temperature (such as 70 DEG C or more), as temperature be 70 DEG C-
100℃.Ammonia is obtained after evaporation, volumetric concentration is greater than 90%.Very low, and other gases are dissolved in 70 DEG C of ammonia or more solution
It can be dissolved in hot water.
The utility model has the advantages that the present invention prepares urea by the microwave method of certain power, hydrolysis of urea and urea pyrolysis are overcome
The deficiency of urea is prepared, equipment requirement is low, and cost of investment is low, and ammonia concentration is obtained after evaporation and is higher than upper two methods, and is whole
Upper preparation cost is low, therefore extremely obvious in the upper advantage of application.Make be atomized microwave after urea liquid instantaneously resolve into ammonia and its
By-product, ammonia and its by-product are pumped into the deionized water solution of certain temperature further reaction by aspiration pump and generate ammonia
Gas.The present invention efficiently solves conventional urea using pyrolysismethod and Hydrolyze method bring by the method that microwave heating generates ammonia
Defect.
Detailed description of the invention
Fig. 1 is the principle i.e. control structure block diagram that urea provided in an embodiment of the present invention prepares ammonia.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to embodiments, to the present invention
It is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not used to
Limit the present invention.
Implement one:
It is 45% urea liquid that solid urea, which is dissolved into mass percent, using the demineralized water after ion-exchange treatment, is led to
Overcompression air atomizing device, into microwave reaction furnace chamber, reaction furnace chamber (can be the reaction chamber of cylinder or rectangle, anti-
The intracavitary magnetron for being evenly arranged and generating microwave is answered, the power of every magnetron is 0.8-3000W)；It is generated by magnetron
The microwave of 2450MHz, the compounding substances after aspiration pump abstraction reaction, into deionized water at a temperature of 90 °C, after evaporation
To ammonia.Every liter of 300mW-2000mW of reaction chamber in actual use.
Implement two:
It is 60% urea liquid that solid urea, which is dissolved into mass percent, using the demineralized water after ion-exchange treatment, is led to
Overcompression air atomizing device (can be the reaction chamber of cylinder or rectangle, the uniform cloth in reaction chamber into microwave reaction furnace chamber
The magnetron for generating microwave is set, the power of every magnetron is 0.8-3000W) in, generate 950MHz's by several magnetrons
Microwave, the compounding substances after aspiration pump abstraction reaction in the deionized water for being 95 DEG C into temperature, obtain ammonia after evaporation.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (1)
1. a kind of method that urea prepares ammonia, it is characterized in that being at mass percent by the dense solution of solid urea using demineralized water
35%-60% urea liquid enters compressed air atomising device, and the urea liquid after atomization enters in microwave reaction furnace chamber, reacting furnace
The microwave of certain frequency is generated in chamber by magnetron, the urea liquid after making atomization instantaneously resolves into ammonia and its by-product,
Ammonia and its by-product are pumped into the aqueous solution of 70 DEG C -100 DEG C temperature further reaction by aspiration pump and generate ammonia；Instead
Answer the microwave for generating certain frequency in furnace chamber by magnetron；150 DEG C -200 DEG C of furnace chamber medium temperature degree of reaction, pressure 1.5MPa -
3.5MPa；
The microwave that frequency is 900MHz-2500 MHz is generated by magnetron in microwave reaction furnace chamber；
Every liter of 300mW-5000 mW of the power of microwave in microwave reaction furnace chamber.
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 |
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| Publication Number | Publication Date |
|---|---|
| CN105883853A CN105883853A (en) | 2016-08-24 |
| CN105883853B true CN105883853B (en) | 2019-01-04 |
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| CN201610488914.6A Expired - Fee Related CN105883853B (en) | 2016-06-28 | 2016-06-28 | A kind of method that urea prepares ammonia |
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Families Citing this family (10)
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
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