CN207091007U - A kind of nitrogen monoxide generating device - Google Patents
A kind of nitrogen monoxide generating device Download PDFInfo
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- CN207091007U CN207091007U CN201720867379.5U CN201720867379U CN207091007U CN 207091007 U CN207091007 U CN 207091007U CN 201720867379 U CN201720867379 U CN 201720867379U CN 207091007 U CN207091007 U CN 207091007U
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- ammonia
- generating device
- catalyst
- nitrogen monoxide
- reaction tube
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Abstract
A kind of nitrogen monoxide generating device is the utility model is related to, nitric oxide is prepared using ammonia and compressed air with high selectivity as raw material.Described device includes the reaction tube equipped with catalyst, and the reaction tube inlet is connected with the flow controller of ammonia and air, exports and be connected with the pipeline with heat tracing, and can be heated by external temperature automatically controlled heating furnace.Nitrogen monoxide generating device of the present utility model is simple in construction, stability is good, flow adjustment range is wide, power consumption is low, is used particularly suitable for middle-size and small-size laboratory test device.
Description
Technical field
The utility model belongs to chemical industry and environmental technology field, is related to a kind of nitrogen monoxide generating device.More specifically, relate to
A kind of and nitrogen monoxide generating device for field test equipments such as chemical industry, environmental protection.
Background technology
In nitric oxide（NO）It is a kind of virose colourless gas, it is one of most important atmosphere pollution, simultaneously
A kind of and important messenger molecule in organism.In fields such as chemical industry, environmental protection, biologic medical, agriculturals, nitric oxide gas
It is generally used for reaction test or related application.Particularly in field of Environment Protection, when testing denitrating catalyst reactivity worth, an oxidation
Nitrogen is used to simulate required reaction flue gas condition.
At present, nitric oxide is generally provided by gas bomb, or is prepared using the method for spraying into ammonia in combustion furnace.
Because steel cylinder dress nitric oxide price is higher, and charge pressure is typically not greater than 3.5 MPa, and every bottle of steel cylinder is only capable of providing about
1400L marks condition gas, and testing cost can be greatly improved when dosage is larger.The method burnt using ammonia can effectively reduce cost,
But oxygen content can not be controlled accurately during due to burning, and the nitric oxide amount generated is generally not sufficiently stable, is difficult to accurate adjustment, choosing
Selecting property can not also ensure.
Document CN101284656A discloses one kind and generates nitric oxide production device using ammonia and air catalytic oxidation, is provided with
Diffusion Mixer, it is connected respectively with Liquid Ammonia Treatment unit, air conditioner unit and converter for ammonia oxidation.Liquid Ammonia Treatment unit is by successively
Ammonia tank, water-bath evaporator and the gaseous mass measurement controller A compositions of connection；What air conditioner unit was connect by being sequentially connected
Air compressor machine, sack cleaner, gaseous mass measurement controller B and electric heater are formed.Gaseous mass measurement controller A and electricity
Heater is connected with Diffusion Mixer respectively.The mixed gas of ammonia and air composition passes through Hydrogen Ignition in converter for ammonia oxidation
After device igniting, combustion reaction occurs under 820 ~ 840 DEG C, platinum-rhodium-palladium catalyst effect, generates nitric oxide gas.Document
CN201834764U instead of air pipe line using oxygen, nitrogen and vapor pipeline, and the portion in air is instead of with water vapour
Divide nitrogen, further increase obtained nitric oxide gas concentration.But both devices are a large amount of industrial productions and set
Meter, equipment and flow are complicated, the temperature needed for converter for ammonia oxidation more than 800 DEG C, also can not accurate adjustment nitric oxide production,
It is not used to middle-size and small-size test device.
The content of the invention
In order to overcome, existing nitrogen monoxide generating device reaction temperature is high, stability is poor, be difficult to accurate adjustment, be not used to
The deficiency of middle-size and small-size test device, the utility model provide a kind of novel nitric oxide generating means.The apparatus structure is simple,
Stability is good, flow adjustment range is wide, reaction temperature is low, is used particularly suitable for middle-size and small-size laboratory test device.
Nitrogen monoxide generating device of the present utility model is using ammonia and compressed air as unstripped gas, including reaction tube, described
Reaction tube inlet is connected with the flow controller of ammonia and air, is exported and is connected with the pipeline with heat tracing, the reaction tube leads to
Cross it is external can temperature automatically controlled heating furnace heated.
Heating furnace used in nitrogen monoxide generating device of the present utility model is electric furnace or infrared heating furnace.It is infrared to add
Hot stove has the advantages that heating rapid, homogeneous heating, easily controllable, is preferred scheme.The reaction tube of the present apparatus be stainless steel or
Quartz material, preferably crystal reaction tube, can high temperature resistant, without metallic element to react it is noiseless, catalyst shape can be checked at any time
State.The present apparatus is reacted at ambient pressure, and reaction tube can be connected by high temperature resistant Graphite pad with air inlet and gas outlet.Using not
During rust steel reaction tube, electric furnace should be used to heat.Tube inner diameter is relevant with required gas flow and loaded catalyst, leads to
Often between 15 ~ 60 mm.
Nitrogen monoxide generating device of the present utility model also includes being used for catalyst A and the catalysis for being catalyzed nitric oxide generation
Agent B, the catalyst A and catalyst B are respectively arranged at the middle part and bottom of reaction tube.Catalyst A is located in the middle part of reaction tube, uses
In the catalytic oxidation of ammonia.Catalyst B is located at reaction tube bottom, for further improving nitric oxide production selectivity.Catalysis
Agent is fixed on inside reaction tube by built-in fixed support.
Nitrogen monoxide generating device of the present utility model is provided with two ammonia, air admission lines, and admission line passes through valve
Door and flow controller are connected with reaction tube.Ammonia is provided by steel cylinder, and the position before reaction tube is entered should install flame and protect
Protect device.Air can be provided by compressor, and compressor outlet needs to install de-watering apparatus.
Ammonia and nitric oxide are toxic gas, therefore the present apparatus should be installed on the region provided with independent ventilation facility.
In conditions permit, the present apparatus should also set pressure sensor and gas sensor, and be controlled with inlet duct, heater interlocking
System, air inlet and heating are automatically stopped when reaction pressure is too high, nitric oxide or ammonia are revealed, ensures operating personnel's safety.
The ratio regular meeting of air and ammonia influences the conversion ratio of ammonia and nitric oxide production selectivity, is generally selected in practical application
The slightly higher ratio of air capacity needed for conversion more complete than ammonia is selected, usually 5:1 ~ 15:1, preferably 8:1 ~ 12:1.It is determined that empty
When gas and ammonia ratio, it is necessary to consider the explosion limit of ammonia.
The utility model is used for the catalytic oxidation of ammonia using effective catalyst, compared with two kinds of gases directly burn,
Reaction temperature is greatly reduced, and generally at 350 ~ 600 DEG C ammonia 100% can convert.Required reaction temperature and catalyst A kinds
Class is relevant with gas flow, and when catalyst A is oxide catalyst, reaction temperature is usually 400 ~ 800 DEG C, more preferably 450
~ 600℃；When catalyst A is loaded catalyst, reaction temperature is usually 300 ~ 600 DEG C, more preferably 350 ~ 500 DEG C.
Temperature described above is reaction bed temperature, rather than heter temperature.
The utility model device export pipeline is provided with heat tracing, for preventing nitric oxide further oxygen in course of conveying
Change.Export pipeline heat tracing temperature is 150 ~ 300 DEG C, preferably 180 ~ 200 DEG C.
Compared with prior art, nitrogen monoxide generating device of the present utility model have it is following significantly a little：
（1）It is simple in construction, it is easy to make and uses；
（2）Using effective catalyst, reaction temperature is low, and nitric oxide selectivity is high；
（3）Caused nitric oxide range of flow is wide, and can fine-tune.
Brief description of the drawings
Fig. 1 is the structural representation of the utility model nitrogen monoxide generating device；
Fig. 2 is the reaction tube structural representation of nitrogen monoxide generating device as shown in Figure 1.
In figure, 1- valves；2- flow controllers；3- valves；4- flow controllers；5- reacts tube inlet；6- reaction tubes；7-
Catalyst A；8 heating furnaces；9- catalyst B；10- reaction tubes export；11- outlet pipes.
Embodiment
Embodiment 1 ~ 9 is illustrated for some embodiments of the present utility model, and tube inner diameter is 25 mm, and catalyst A is loaded
Measure as 30 ml（Loaded catalyst）Or 50 ml（Oxide）, optional catalyst B loadings are 40 ml.All embodiments
Air is 10 with ammonia flow ratio:1, ammonia flow stable regulation between 5 ~ 200 L/h, after ammonia flow is stable in product
Content of nitric oxide keeps stable therewith.
Ammonia is injected directly into boiler-burner by comparative example 1, and caused NO, which is mixed in boiler smoke, to discharge.
Comparative example 2 is used using the converter for ammonia oxidation for meeting document CN101284656A descriptions, built-in platinum rhodium palladium ternary plain net
Burnt in the catalysis of ammonia, reaction needs to use Hydrogen Ignition when starting.Nitric oxide is exported when ammonia flow is less than 50 L/h
Concentration can not keep stable.
NH3Conversion ratio and NO selectivity computational methods be：
NH3Conversion ratio=（Entrance NH3Concentration-outlet NH3Concentration）/ entrance NH3Concentration * 100%
NO selectivity=outlets NO concentration/outlet NOxConcentration * 100%
Following table gives the reaction condition and reaction result of embodiment and comparative example.
It can be seen from upper table result one is prepared using nitrogen monoxide generating device of the present utility model and comparative example 1 and 2
Nitrogen oxide gas is compared, and reaction temperature substantially reduces, and has more preferable selectivity, especially using crystal reaction tube, infrared anti-
Answer under conditions of stove heat, catalyst be made up of two kinds of A and B, reaction result is optimal.
Claims (4)
1. a kind of nitrogen monoxide generating device, nitric oxide is prepared with high selectivity as raw material using ammonia and compressed air, it is special
Sign is that described device includes reaction tube（6）, the reaction tube inlet（5）With ammonia and the flow controller of air（2,4）Even
Connect, export（10）With the pipeline with heat tracing（11）It is connected, the reaction tube（6）Pass through external heating furnace that can be temperature automatically controlled
（8）Heating.
2. nitrogen monoxide generating device according to claim 1, it is characterised in that also include being used to be catalyzed nitric oxide life
Into catalyst A（7）With catalyst B（9）, the catalyst A（7）With catalyst B（9）It is respectively arranged at reaction tube（6）In
Portion and bottom.
3. nitrogen monoxide generating device according to claim 1, it is characterised in that the reaction tube（6）For quartz material.
4. nitrogen monoxide generating device according to claim 1, it is characterised in that the heating furnace（8）For high-temperature infrared
Heating furnace.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720867379.5U CN207091007U (en) | 2017-07-18 | 2017-07-18 | A kind of nitrogen monoxide generating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720867379.5U CN207091007U (en) | 2017-07-18 | 2017-07-18 | A kind of nitrogen monoxide generating device |
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| Publication Number | Publication Date |
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| CN207091007U true CN207091007U (en) | 2018-03-13 |
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| CN201720867379.5U Active CN207091007U (en) | 2017-07-18 | 2017-07-18 | A kind of nitrogen monoxide generating device |
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| CN (1) | CN207091007U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021069889A1 (en) * | 2019-10-08 | 2021-04-15 | Bedfont Scientific Limited | Device for converting ammonia to nitric oxide |
-
2017
- 2017-07-18 CN CN201720867379.5U patent/CN207091007U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021069889A1 (en) * | 2019-10-08 | 2021-04-15 | Bedfont Scientific Limited | Device for converting ammonia to nitric oxide |
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