CN105217585A - Double pressurized method nitric acid production plant - Google Patents
Double pressurized method nitric acid production plant Download PDFInfo
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- CN105217585A CN105217585A CN201410244264.1A CN201410244264A CN105217585A CN 105217585 A CN105217585 A CN 105217585A CN 201410244264 A CN201410244264 A CN 201410244264A CN 105217585 A CN105217585 A CN 105217585A
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Abstract
The invention provides a kind of double pressurized method nitric acid production plant, comprise ammonia feeding material component, air feeding material component, the empty mixing tank of ammonia and Reconstruction of End Gas Separator; Wherein, ammonia feeding material component comprises the ammonia evaporator, ammonia superheater, the ammonia strainer that are connected successively by ammonia transport pipe, the output terminal of ammonia strainer is communicated with by the ammonia entrance of the empty mixing tank of ammonia transport pipe and ammonia, and the ammonia transport pipe between ammonia superheater and ammonia strainer is disposed with ammonia regulated valve and ammonia emptying valve along ammonia throughput direction; Air feeding material component comprises air compressor machine, airflow pipe; Gas pipe line on the ammonia transport pipe that double pressurized method nitric acid production plant also comprises that one end is connected with the gas discharge outlet of Reconstruction of End Gas Separator, the other end is connected between ammonia regulated valve and ammonia superheater.Adopt device of the present invention, before nitric acid production, replaced by tail gas tieback to ammonia transport pipe ammonia to carry out ammonia sky than test, greatly reducing the ammonia cost of debug phase.
Description
Technical field
The invention belongs to nitric acid production technical field, be specifically related to a kind of double pressurized method nitric acid production plant.
Background technology
In the method for current dilute nitric acid production in the industry, the most general method adopts double pressurized method, first the air of two kinds of unstripped gases and 0.45MPa and 0.52MPa ammonia are generated NOx by a pressure oxidation in certain proportion under platinum guaze catalyzer, NOx and secondary air are undertaken being forced into 1.1MPa by nitrogen oxide gas compressor again afterwards, then absorb in absorption tower, generate dust technology.
Wherein for the most important thing is in whole production process that the blending ratio of unstripped gas air and ammonia controls, because ammonia is Class B Hazardous substances, ignition temperature is 651 degree, limits of explosion is the volume fraction of 15.5 ~ 27.0%, once the ammonia concentration in An Kong mixed air vessel within the scope of this, just have the danger of blast.Therefore need strictly to control the conveying proportioning of two kinds of unstripped gases, in domestic production, general control ammonia sky ratio is about 9.6%, and Japanese general control is about 9%.Wherein aborning, utilize device as shown in Figure 1 to carry out, Fig. 1 is the schematic diagram of existing double pressurized method nitric acid production plant in the control of the empty ratio of ammonia; Raw materials ammonia evaporates through ammonia evaporator A and ammonia evaporator B, gas ammonia afterwards enters ammonia superheater and again heats up, then through filtration, removal of impurities, the air compressed with air compressor jointly enters the empty mixing tank of ammonia and mixes with certain proportion, and then is oxidized.
Before production, operator are by the empty ratio display of ammonia flow meter, air flowmeter and middle control ammonia, ammonia, air flow quantity are regulated, accurately 7%, 8%, 9%, 9.5% these ratios generally will be tested in order to make ratio, each Value Operations human users 4 times, until the empty ratio of the ammonia reaching processing requirement is stablized.And above-mentioned operation is each time when carrying out, all last time operation must be terminated rear ducted ammonia emptying, just can guarantee the accuracy of subsequent operation, therefore said process causes a large amount of wastes of raw material ammonia after repeating, and the ammonia of straightway testing discharge causes, and the smell is awful, environmental pollution.
Summary of the invention
The object of the embodiment of the present invention is the above-mentioned deficiency overcoming prior art, provides a kind of ammonia that substituted by tail gas tieback to ammonia transport pipe to carry out the double pressurized method nitric acid production plant of ammonia sky than test.
In order to realize foregoing invention object, the technical scheme of the embodiment of the present invention is as follows:
A kind of double pressurized method nitric acid production plant, comprises ammonia feeding material component, air feeding material component, the empty mixing tank of ammonia and has the Reconstruction of End Gas Separator of gas discharge outlet; Wherein,
Described ammonia feeding material component comprises ammonia superheater, ammonia strainer and connects the ammonia transport pipe of ammonia superheater and ammonia strainer; Ammonia is delivered to ammonia metre filter through ammonia transport pipe after the heating of ammonia superheater, then exports the empty mixing tank of ammonia to by ammonia strainer; Ammonia transport pipe is disposed with ammonia regulated valve and ammonia emptying valve along ammonia delivery direction;
Described air feeding material component comprises air compressor machine, connects the airflow pipe of the air input interface of the output terminal of this air compressor machine and the empty mixing tank of ammonia;
Described double pressurized method nitric acid production plant also comprises gas pipe line, and this gas pipe line one end is connected with the gas discharge outlet of Reconstruction of End Gas Separator, the other end is connected on the ammonia transport pipe between ammonia regulated valve and ammonia superheater.
Adopt the ammonia of above-mentioned double pressurized method nitric acid production plant of the present invention before nitric acid production empty than in regulate process, before the tail gas directly got rid of by Reconstruction of End Gas Separator delivers to the ammonia variable valve of ammonia transport pipe, so early stage ammonia sky than regulate test in for replacing ammonia to carry out Flow-rate adjustment, greatly reducing the ammonia cost of debug phase.Further, in debug process, only opening air compressor carrying out ammonia sky than regulating test, the environmental pollution that the discharge reducing ammonia causes.And in process of the test, air compressor compress conveying air without reaction with absorb, all can discharge from Reconstruction of End Gas Separator in the production equipment of sealing, the air-leakage test in device can be carried out according to the power of air compressor and each under meter registration value.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing:
Fig. 1 is the schematic diagram of existing double pressurized method nitric acid production plant;
Fig. 2 is the schematic diagram of embodiment of the present invention double pressurized method nitric acid production plant.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
Example of the present invention provides a kind of double pressurized method nitric acid production plant and control method, see Fig. 2, Fig. 2 is the schematic diagram of embodiment of the present invention double pressurized method nitric acid production plant, comprises ammonia feeding material component 10 (not having the label of 10 in Fig. 2), the empty mixing tank 30 of air feeding material component 20, ammonia and Reconstruction of End Gas Separator 40.Wherein, the empty mixing tank 30 of ammonia has ammonia input interface and air input interface.Reconstruction of End Gas Separator 40 has the gas discharge outlet 41 for discharging divided gas flow.
Ammonia feeding material component 10 comprises successively by ammonia evaporator 11, ammonia superheater 12, the ammonia strainer 13 of ammonia transport pipe 14 connection; The input terminus of ammonia evaporator 11 is connected with the input terminus of ammonia superheater 12 for receiving the raw materials ammonia, the output terminal that add in production; The output terminal of ammonia superheater 12 is connected to the gas ammonia input interface of the empty mixing tank 30 of ammonia through ammonia strainer 13 by ammonia transport pipe 14.Liquid ammonia material flashes to gaseous ammonia at ammonia evaporator 11, then gaseous ammonia is sent into ammonia strainer 13 and is filtered again after ammonia superheater 12 heats, and the ammonia input interface finally sending into the empty mixing tank 30 of ammonia by ammonia strainer 13 again mixes with air to the empty mixing tank 30 of ammonia.The output terminal of ammonia superheater 12 is connected by ammonia transport pipe 14 with the input terminus of ammonia strainer 13.In order to realize the preparation of the empty ratio of ammonia, therefore be disposed with the ammonia regulated valve 141 near ammonia superheater 12 one end and the ammonia emptying valve 142 near gas ammonia strainer 13 one end at ammonia transport pipe 14 along the direction that ammonia is carried, realize regulating the flow of ammonia.And ammonia transport pipe 14 further between ammonia regulated valve 141 and ammonia emptying valve 142 arranges ammonia pressure gauge 143, ammonia flow meter 144, ammonia thermometer 145 further, concrete, ammonia pressure gauge 143, ammonia flow meter 144, ammonia thermometer 145 erection sequence are for set gradually ammonia pressure gauge 143, ammonia thermometer 145, ammonia flow meter 144 by ammonia regulated valve 141 to ammonia emptying valve 142 direction; When the ammonia by conveying in ammonia regulated valve 141 pairs of ammonia transport pipes 14 carries out Flow-rate adjustment, can carry out checking and verifying according to the registration of ammonia pressure gauge 142, ammonia flow meter 143.
Air feeding material component 20 comprises the airflow pipe 22 of empty mixing tank 30 air input of air compressor 21, the output terminal connecting air compressor 21 and ammonia; Airflow pipe 22 is provided with air vent valve 221, airflow pipe 22 is also provided with air manometer 222, air thermometer 223 and air flowmeter 224 between air vent valve 221 and the empty mixing tank 30 of ammonia.Because the power of air compressor 21 is specified, therefore the emptying manipulation of air vent valve 221 just can regulate the air that air compressor 21 exports, and air manometer 222 and air flowmeter 224 can be monitored air in regulate process.
Above-mentioned double pressurized method nitric acid production plant of the present invention also comprises a gas pipe line 42, and one end of this gas pipe line 42 is connected with the gas discharge outlet 41 of Reconstruction of End Gas Separator 40, receives the tail gas that Reconstruction of End Gas Separator 40 is discharged; The other end of gas pipe line 42 is connected in portion's section of ammonia transport pipe 14 between ammonia regulated valve 141 and ammonia superheater 12, recycling tail gas is served as ammonia and carries out ammonia sky than test.
In force, gas pipe line 42 is provided with stopping valve 421, for controlling the break-make of gas pipe line 42.Opening than during test when carrying out ammonia sky, closing stopping valve 421 At All Other Times and carrying out exhaust emissions, switching simple.
In use can adopt, on the gas discharge outlet 41 of Reconstruction of End Gas Separator 40, a Y-junction (not shown) is installed, first sub-interface of this Y-junction is connected with the gas discharge outlet 41 of Reconstruction of End Gas Separator 40, the second sub-interface is got rid of for tail gas for connecting gas transmission pipe road 42, the 3rd sub-interface, tail gas tieback or discharge can be carried out by the break-make switching of the second sub-interface and the 3rd sub-interface, simple to operate.
Aborning according to the unstripped gas of tail gas and the amount of tail gas, the situation that here gas pipe line 42 is used according to the invention, preferably adopts DN200 pipeline, and nominal diameter is that in the pipeline of 200mm and nitric acid production, the flux matched property of exhaust emissions is the suitableeest.
Or adopted by above-mentioned Y-junction the T-valve with an import two outlet to replace, the import of T-valve is connected with the gas discharge outlet 41 of Reconstruction of End Gas Separator 40, first the exporting and be connected on the position on ammonia transport pipe 14 between ammonia regulated valve 141 and ammonia superheater 12 by gas pipe line 42 of T-valve, and the second outlet is used for tail gas and gets rid of.So in use, T-valve self can carry out on-off valve regulation, and the parts therefore gas pipe line 42 can being exempted stopping valve 421 and so on are arranged.
And conveniently raw material ammonia separates than in process of the test by ammonia sky completely, and be beneficial to above-mentioned gas pipe line 42 tieback to carry out being connected with ammonia transport pipe during ammonia transport pipe 14 and ammonia sky than to test and production switches; So arrange flange 121 at the output terminal of above-mentioned ammonia superheater 12 and ammonia transport pipe 14 junction, first is facilitate the output terminal interface of ammonia superheater 12 and the connection of ammonia transport pipe 14 and assembling, second is that ammonia sky can add blank flange than during test on flange 121, then can directly the connection of ammonia superheater 12 with ammonia transport pipe 14 be blocked by blind plate, so be convenient to above-mentioned ammonia sky than the interference etc. that can not be subject to residual ammonia in ammonia superheater 12 during test completely, make test more accurate.
So adopt that the ammonia of double pressurized method nitric acid production plant of the present invention before nitric acid production is empty to be substituted ammonia from Reconstruction of End Gas Separator 40 expellant gas carry out ammonia sky than test than adopting in regulate process, specifically can with reference to following steps:
S1, unlatching air compressor 21; Wherein air compressor 21 can adopt the existing type general for double pressurized method production nitric acid, and when nitric acid is normally produced, its rotating speed reaches more than 95%, and the load of steam turbine is 70%, and top hole pressure is 0.27MPa, temperature is 206 DEG C; Also carry out according to state when producing at the trial.
The registration of S2, inspection air flowmeter 224, opens air vent valve 221 about 20%.
S3, treat air flowmeter 224 numerical stability, slowly open the stopping valve 421 on gas pipe line 42, so the tail gas of Reconstruction of End Gas Separator 42 is delivered in ammonia transport pipe 14.Certainly according to said process, now in whole nitric acid production plant, carry out air conveying owing to only opening air compressor 21, be therefore delivered in ammonia transport pipe 14 by gas pipe line 42 that to pass into tail gas be the air not carrying out ammonification and absorption reaction.
S4, check and the registration of ammonia pressure gauge 143 on ammonia transport pipe 14 tend towards stability until the registration of ammonia pressure gauge 143 is identical with the preset value of test, after ammonia emptying valve 142 is opened 20%.The predetermined numerical value of ammonia pressure gauge 143 according to ammonia sky when producing than and the flow of ammonia, be 0.52MPa.
The ratio carrying out the empty ratio of ammonia required for S5, basis regulates ammonia regulated valve 141, until ammonia flow meter 144, middle control ammonia sky is more equal with the value set during test than showing numerical value, and tends towards stability.
The trial value of S6, the empty ratio of ammonia according to 7%, 8%, 9%, 9.5% carries out repeating step S1-S5 operation, until all instrument all conform to state required when producing with the state of valve, and finally closedown stopping valve 421, stop gear operation.
Adopt the ammonia of above-mentioned double pressurized method nitric acid production plant of the present invention before nitric acid production empty than in regulate process, by Reconstruction of End Gas Separator 40 expellant gas tieback to ammonia variable valve 141 front end of ammonia transport pipe 14, for replacing ammonia to carry out Flow-rate adjustment during ammonia sky ratio so before producing regulates and tests, greatly reducing the ammonia cost of debug phase.According to existing ammonia sky than the benefit calculation in adjustment, liquid ammonia material unit price 2600 yuan/ton; Each ammonia is empty to disappear ammonia consumption 6 tons/time than test; Operator's quantity 4 people; Number of operations 4 times; The ammonia expense that wastes raw material altogether is 2600 yuan/ton × 6 tons/time × 4 people × 4 time=and 249600 yuan.
Further, in debug process, only open air compressor 21 simulate, what therefore discharge in process of the test is also air, the environmental pollution that the discharge reducing ammonia causes.And in above-mentioned simulation process, air compressor 21 compress conveying air without reaction and absorb, can all discharge from Reconstruction of End Gas Separator 40 in the production equipment of sealing, this way can get through technical process, before production, adopt air dielectric to carry out pre-manufactured test, whether the resistance to air loss so can also shown in numerical value judging device according to the power of air compressor 21 and each under meter in process of the test is good.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. a double pressurized method nitric acid production plant, comprises ammonia feeding material component, air feeding material component, the empty mixing tank of ammonia and has the Reconstruction of End Gas Separator of gas discharge outlet; Wherein,
Described ammonia feeding material component comprises the ammonia evaporator, ammonia superheater, the ammonia strainer that are communicated with successively by ammonia transport pipe, the output terminal of described ammonia strainer is communicated with by the ammonia entrance of ammonia transport pipe and the empty mixing tank of described ammonia, and the ammonia transport pipe between the described ammonia superheater of connection and ammonia strainer is disposed with ammonia regulated valve and ammonia emptying valve along ammonia delivery direction;
Described air feeding material component comprises air compressor machine, connects the airflow pipe of the gas inlet of the output terminal of this air compressor machine and the empty mixing tank of ammonia;
Described double pressurized method nitric acid production plant also comprises gas pipe line, and this gas pipe line one end is connected with the gas discharge outlet of Reconstruction of End Gas Separator, the other end is connected on the ammonia transport pipe between ammonia regulated valve and ammonia superheater.
2. double pressurized method nitric acid production plant as claimed in claim 1, it is characterized in that, described gas pipe line is provided with stopping valve.
3. double pressurized method nitric acid production plant as claimed in claim 1 or 2, it is characterized in that, described ammonia superheater and ammonia transport pipe junction are provided with flange.
4. double pressurized method nitric acid production plant as claimed in claim 3, is characterized in that, described flange is provided with blind plate.
5. double pressurized method nitric acid production plant as claimed in claim 1 or 2, it is characterized in that, described gas pipe line is DN200 pipeline.
6. double pressurized method nitric acid production plant as claimed in claim 1 or 2, it is characterized in that, the gas discharge outlet of described Reconstruction of End Gas Separator is provided with Y-junction; First sub-interface of this Y-junction is connected with gas discharge outlet, the second sub-interface be connected between ammonia regulated valve and ammonia superheater ammonia transport pipe by described gas pipe line on, the 3rd sub-interface is for emission.
7. double pressurized method nitric acid production plant as claimed in claim 1 or 2, is characterized in that, described ammonia transport pipe is also provided with the ammonia pressure gauge, ammonia flow meter, the ammonia thermometer that are positioned at described ammonia regulated valve and ammonia emptying valve.
8. double pressurized method nitric acid production plant as claimed in claim 1 or 2, it is characterized in that, described airflow pipe is provided with air vent valve and air manometer, air thermometer, air flowmeter between this air vent valve and the empty mixing tank of ammonia.
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| CN201410244264.1A CN105217585B (en) | 2014-06-04 | 2014-06-04 | Double pressurized method nitric acid production plant |
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| CN201410244264.1A CN105217585B (en) | 2014-06-04 | 2014-06-04 | Double pressurized method nitric acid production plant |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105786055A (en) * | 2016-03-07 | 2016-07-20 | 重庆大学 | Control system and control method for ammonia-to-air ratio automatic set value in nitric acid production oxidation furnace |
| CN105883735A (en) * | 2016-05-13 | 2016-08-24 | 河南心连心化肥有限公司 | Oxygen-enriched-process nitric acid production device and nitric acid production method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10011335A1 (en) * | 2000-03-10 | 2001-09-20 | Krupp Uhde Gmbh | Production of nitric acid of specified concentration, useful in the production of adipic acid, caprolactam, toluene diisocyanate etc., by one- or 2-pressure combustion of ammonia and absorption uses dried air supply |
| CN201447362U (en) * | 2009-07-31 | 2010-05-05 | 山东联合化工股份有限公司 | Nitric acid production equipment system |
| CN202785660U (en) * | 2012-08-31 | 2013-03-13 | 安徽华尔泰化工股份有限公司 | Energy-saving type gaseous ammonia generating system for dilute nitric acid device |
| CN202898028U (en) * | 2012-11-14 | 2013-04-24 | 中国石油天然气股份有限公司 | Feeding system of device for producing nitric acid by oxidizing ammonia |
| CN204162423U (en) * | 2014-06-04 | 2015-02-18 | 贵州芭田生态工程有限公司 | Double pressurized method nitric acid production plant |
-
2014
- 2014-06-04 CN CN201410244264.1A patent/CN105217585B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10011335A1 (en) * | 2000-03-10 | 2001-09-20 | Krupp Uhde Gmbh | Production of nitric acid of specified concentration, useful in the production of adipic acid, caprolactam, toluene diisocyanate etc., by one- or 2-pressure combustion of ammonia and absorption uses dried air supply |
| CN201447362U (en) * | 2009-07-31 | 2010-05-05 | 山东联合化工股份有限公司 | Nitric acid production equipment system |
| CN202785660U (en) * | 2012-08-31 | 2013-03-13 | 安徽华尔泰化工股份有限公司 | Energy-saving type gaseous ammonia generating system for dilute nitric acid device |
| CN202898028U (en) * | 2012-11-14 | 2013-04-24 | 中国石油天然气股份有限公司 | Feeding system of device for producing nitric acid by oxidizing ammonia |
| CN204162423U (en) * | 2014-06-04 | 2015-02-18 | 贵州芭田生态工程有限公司 | Double pressurized method nitric acid production plant |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105786055A (en) * | 2016-03-07 | 2016-07-20 | 重庆大学 | Control system and control method for ammonia-to-air ratio automatic set value in nitric acid production oxidation furnace |
| CN105883735A (en) * | 2016-05-13 | 2016-08-24 | 河南心连心化肥有限公司 | Oxygen-enriched-process nitric acid production device and nitric acid production method |
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