CN105217585B - Double pressurized method nitric acid production plant - Google Patents
Double pressurized method nitric acid production plant Download PDFInfo
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- CN105217585B CN105217585B CN201410244264.1A CN201410244264A CN105217585B CN 105217585 B CN105217585 B CN 105217585B CN 201410244264 A CN201410244264 A CN 201410244264A CN 105217585 B CN105217585 B CN 105217585B
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Abstract
The invention provides a kind of double pressurized method nitric acid production plant, including ammonia feeding material component, air feeding material component, ammonia sky blender and Reconstruction of End Gas Separator；Wherein, ammonia feeding material component includes the ammonia evaporator, ammonia superheater, the ammonia filter that are sequentially connected by ammonia conveyance conduit, the output end of ammonia filter is connected by ammonia conveyance conduit with the ammonia entrance of ammonia sky blender, and ammonia control valve and ammonia emptying valve are disposed with along ammonia conveying direction on the ammonia conveyance conduit between ammonia superheater and ammonia filter；Air feeding material component includes air compressor machine, airflow pipe；Gas discharge outlet of the double pressurized method nitric acid production plant also including one end and Reconstruction of End Gas Separator is connected, the gas pipeline that the other end is connected on the ammonia conveyance conduit between ammonia control valve and ammonia superheater.Using device of the invention, tail gas tieback to ammonia conveyance conduit is carried out into the empty ratio experiment of ammonia instead of ammonia before nitric acid production, greatly reducing the ammonia cost in debugging stage.
Description
Technical field
The invention belongs to nitric acid production technical field, and in particular to a kind of double pressurized method nitric acid production plant.
Background technology
Method most general in the method for dilute nitric acid production in the industry is to use double pressurized method at present, first by two kinds of raw materials
Gas is that the air and 0.52MPa ammonias of 0.45MPa pass through a pressurised oxygen metaplasia under platinum guaze catalyst in certain proportion
Into NOx, NOx and auxiliary air carry out being forced into 1.1MPa again by nitrogen oxide gas compressor afterwards, then in absorption tower
Absorb, generate dust technology.
Wherein for the above all mixed proportion control of unstrpped gas air and ammonia in whole production process, because
Ammonia is Class B dangerous substance, and ignition temperature is 651 degree, and explosion limit is 15.5~27.0% volume fraction, once ammonia is empty
When ammonia concentration in mixed air vessel is in the range of this, the danger of blast is just had.Therefore need to two kinds of unstrpped gas
Conveying proportioning is strictly controlled, and, 9.6% or so, Japanese general control is 9% for general control ammonia sky ratio in domestic production
Left and right.The wherein control of ammonia sky ratio aborning, is carried out using device as shown in Figure 1, and Fig. 1 gives birth to for existing double pressurized method nitric acid
Produce the schematic diagram of device；Raw materials ammonia is evaporated by ammonia evaporator A and ammonia evaporator B, and gas ammonia afterwards is overheated into ammonia
Device heats up again, and then by filtering, removal of impurities, the air compressed with air compressor is jointly into ammonia sky blender necessarily comparing
Example mixing, and then aoxidized.
Before production, operating personnel are shown by ammonia flow meter, mass air flow sensor and middle control ammonia sky ratio, to ammonia
Gas, air mass flow are adjusted, in order that ratio accurately will typically test 7%, 8%, 9%, 9.5% these ratios, each
Value Operations human users 4 times, untill the ammonia sky ratio stabilization for reaching technological requirement.And above-mentioned operation each time is when carrying out,
All have to that last time operation is terminated the ammonia emptying in rear pipeline, just can ensure that the accuracy of subsequent operation, thus it is above-mentioned
Process causes a large amount of wastes of raw material ammonia after repeating, and the ammonia of straightway testing discharge causes that the smell is awful, environment dirty
Dye.
The content of the invention
The above-mentioned deficiency for aiming to overcome that prior art of the embodiment of the present invention, there is provided a kind of that tail gas tieback is defeated to ammonia
Sending pipeline to substitute ammonia carries out the empty double pressurized method nitric acid production plant than testing of ammonia.
In order to realize foregoing invention purpose, the technical scheme of the embodiment of the present invention is as follows：
A kind of double pressurized method nitric acid production plant, including ammonia feeding material component, air feeding material component, ammonia sky blender and
Reconstruction of End Gas Separator with gas discharge outlet；Wherein,
The ammonia feeding material component includes the ammonia of ammonia superheater, ammonia filter and connection ammonia superheater and ammonia filter
Conveyance conduit；Ammonia is delivered to ammonia filter and filters after being heated through ammonia superheater through ammonia conveyance conduit, then is exported by ammonia filter
To ammonia sky blender；On ammonia conveyance conduit ammonia control valve and ammonia emptying valve are disposed with along ammonia direction of transfer；
Air input of the air feeding material component including air compressor machine, the output end for connecting the air compressor machine and ammonia sky blender
The airflow pipe of interface；
The double pressurized method nitric acid production plant also includes the gas of gas pipeline, the gas pipeline one end and Reconstruction of End Gas Separator
The connection of body outlet, the other end are connected on the ammonia conveyance conduit between ammonia control valve and ammonia superheater.
During the empty ratio regulation of ammonia using above-mentioned double pressurized method nitric acid production plant of the invention before nitric acid production,
Before the tail gas that Reconstruction of End Gas Separator is directly excluded to be delivered to the ammonia regulating valve of ammonia conveyance conduit, then empty than adjusting in the ammonia of early stage
For carrying out Flow-rate adjustment instead of ammonia in section experiment, the ammonia cost in debugging stage is greatly reducing.Also, adjusting
Air compressor is only opened during examination carries out the empty ratio regulation experiment of ammonia, reduces the environment caused by the discharge of ammonia
Pollution.And in process of the test, air compressor compresses the air of conveying without reaction and absorbs, in the production of sealing
Can all be discharged from Reconstruction of End Gas Separator in device, device can be carried out according to the power of air compressor and each flowmeter registration value
Interior air-leakage test.
Brief description of the drawings
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.
Specific embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
Present example provides a kind of double pressurized method nitric acid production plant and control method, and referring to Fig. 2, Fig. 2 is this hair
The schematic diagram of bright embodiment double pressurized method nitric acid production plant, including ammonia feeding material component 10, air feeding material component 20, ammonia are empty mixed
Clutch 30 and Reconstruction of End Gas Separator 40.Wherein, ammonia sky blender 30 has ammonia input interface and air input interface.Tail gas
Separator 40 has the gas discharge outlet 41 that gas is separated for discharging.
Ammonia feeding material component 10 includes passing sequentially through ammonia evaporator 11, the ammonia superheater 12, ammonia of the connection of ammonia conveyance conduit 14
Filter 13；The input of ammonia evaporator 11 is used to receive the raw materials ammonia of addition in production, output end and ammonia superheater 12
Input is connected；The output end of ammonia superheater 12 is connected to ammonia sky blender 30 by ammonia conveyance conduit 14 through ammonia filter 13
Gas ammonia input interface.Liquid ammonia material flashes to gaseous ammonia in ammonia evaporator 11, after then gaseous ammonia is heated through ammonia superheater 12 again
Feeding ammonia filter 13 is filtered, and the ammonia input interface for finally sending into ammonia sky blender 30 by ammonia filter 13 again mixes to ammonia is empty
Mixed with air in device 30.The output end of ammonia superheater 12 is connected with the input of ammonia filter 13 by ammonia conveyance conduit 14
Connect.In order to realize the preparation of ammonia sky ratio, therefore it is disposed near ammonia mistake along the direction that ammonia is conveyed in ammonia conveyance conduit 14
The ammonia control valve 141 of the one end of hot device 12 and the ammonia emptying valve 142 near the one end of gas ammonia filter 13, realize to ammonia
The flow of gas is adjusted.And further ammonia control valve 141 and ammonia emptying valve 142 between ammonia conveyance conduit 14
It is upper that ammonia pressure gauge 143, ammonia flow meter 144, ammonia thermometer 145 are further set, specifically, ammonia pressure gauge 143, ammonia flow meter
144th, the erection sequence of ammonia thermometer 145 is to set gradually ammonia pressure by ammonia control valve 141 to ammonia emptying valve 142 direction
Table 143, ammonia thermometer 145, ammonia flow meter 144；By ammonia control valve 141 to the ammonia of conveying in ammonia conveyance conduit 14
When carrying out Flow-rate adjustment, can be checked and be verified according to the registration of ammonia pressure gauge 142, ammonia flow meter 143.
Air feeding material component 20 includes air compressor 21, the output end of connection air compressor 21 and ammonia sky blender 30
The airflow pipe 22 of air input；Airflow pipe 22 is provided with air vent valve 221, on airflow pipe 22
It is additionally provided with air manometer 222, air thermometer 223 and air between air vent valve 221 and ammonia sky blender 30
Flowmeter 224.Because the power of air compressor 21 is specified, therefore the emptying manipulation of air vent valve 221 just can be right
The air of the output of air compressor 21 is adjusted, and air manometer 222 and mass air flow sensor 224 can during regulation
It is monitored with to air.
Above-mentioned double pressurized method nitric acid production plant of the invention also includes a gas pipeline 42, one end of the gas pipeline 42
It is connected with the gas discharge outlet 41 of Reconstruction of End Gas Separator 40, receives the tail gas of the discharge of Reconstruction of End Gas Separator 40；Gas pipeline 42 it is another
End is connected in the section that ammonia conveyance conduit 14 is located between ammonia control valve 141 and ammonia superheater 12, and recycling tail gas are served as
It is empty than experiment that ammonia carries out ammonia.
In force, gas pipeline 42 is provided with stop valve 421, the break-make for controlling gas pipeline 42.When carrying out ammonia
Opened when sky is than experiment, other time closes stop valve 421 and carries out exhaust emissions, switching is simple.
Can use in use and a three-way connection is installed (in figure not on the gas discharge outlet 41 of Reconstruction of End Gas Separator 40
Show), the first sub-interface of the three-way connection is connected with the gas discharge outlet 41 of Reconstruction of End Gas Separator 40, the second sub-interface is used to connect
Connect gas pipeline 42, the 3rd sub-interface to be excluded for tail gas, can be switched by the break-make of the second sub-interface and the 3rd sub-interface
Tail gas tieback or discharge are carried out, it is simple to operate.
Unstrpped gas and the amount of tail gas aborning according to tail gas, gas pipeline 42 is used according to the invention herein
Situation, it is preferred to use DN200 pipelines, nominal diameter is most suitable for the pipeline property flux matched with exhaust emissions in nitric acid production of 200mm.
Or be replaced above-mentioned three-way connection using the triple valves with two outlets of import, triple valve enters
Mouth is connected with the gas discharge outlet 41 of Reconstruction of End Gas Separator 40, the first outlet of triple valve is connected to ammonia and conveys by gas pipeline 42
On position on pipeline 14 between ammonia control valve 141 and ammonia superheater 12, second outlet is excluded for tail gas.So make
In, triple valve can be set with itself carrying out to exempt on on-off valve regulation, therefore gas pipeline 42 part of stop valve 421 etc
Put.
And ammonia is empty more completely separated by raw material ammonia than during experiment for convenience, and beneficial to above-mentioned gas pipeline 42
Carry out with ammonia conveyance conduit being connected during tieback to ammonia conveyance conduit 14 and ammonia is empty is switched over than experiment and production；So above-mentioned
The output end of ammonia superheater 12 sets flange 121 with the junction of ammonia conveyance conduit 14, and first is the output for facilitating ammonia superheater 12
The connection and assembling of end interface and ammonia conveyance conduit 14, second be ammonia it is empty than experiment when can on flange 121 additive process tritonope
Plate, then directly can be blocked the connection of ammonia superheater 12 and ammonia conveyance conduit 14, then be easy to above-mentioned ammonia empty by blind plate
Will not be subject to remain interference of ammonia etc. in ammonia superheater 12 completely during than experiment, make experiment more accurate.
During the empty ratio regulation of ammonia so using double pressurized method nitric acid production plant of the invention before nitric acid production
The empty ratio experiment of ammonia can be carried out using the gas instead ammonia from the discharge of Reconstruction of End Gas Separator 40, specifically be referred to following steps：
S1, unlatching air compressor 21；Wherein air compressor 21 can produce nitric acid using double pressurized method is currently used for
General type, when nitric acid is normally produced, its rotating speed reaches more than 95%, and the load of steam turbine is 70%, and outlet pressure is
0.27MPa, temperature are 206 DEG C；Also carried out according to state when producing at the trial.
S2, the registration for checking mass air flow sensor 224, open air vent valve 221 about 20%.
S3, the numerical stability of mass air flow sensor 224 is treated, the slow stop valve 421 opened on gas pipeline 42, then tail gas point
Tail gas from device 42 is delivered in ammonia conveyance conduit 14.Certainly it can be seen from said process, now in whole nitric acid production plant
In carry out air conveying due to only opening air compressor 21, therefore ammonia conveyance conduit 14 is delivered to by gas pipeline 42
In to be passed through tail gas be the air for not carrying out ammonification and absorbing reaction.
S4, the registration for checking ammonia pressure gauge 143 on ammonia conveyance conduit 14, until the registration of ammonia pressure gauge 143 and experiment
Predetermined value is identical to tend towards stability, after by ammonia emptying valve 142 open 20%.The predetermined numerical value of ammonia pressure gauge 143 is according to production
When ammonia it is empty than and ammonia flow, be 0.52MPa.
The ratio regulation ammonia control valve 141 of ammonia sky ratio is carried out required for S5, basis, until ammonia flow meter 144, middle control
Ammonia is empty more equal with the value set when testing than display numerical value, and tends towards stability.
S6, according to 7%, 8%, 9%, 9.5% ammonia sky ratio test value carry out repeat step S1-S5 operations, until institute
Required state is consistent when the state of some instrument and valve is with production, finally closes stop valve 421, arresting stop operation.
During the empty ratio regulation of ammonia using above-mentioned double pressurized method nitric acid production plant of the invention before nitric acid production,
The gas tieback that Reconstruction of End Gas Separator 40 is discharged is to the front end of ammonia regulating valve 141 of ammonia conveyance conduit 14, then before production
The empty experiment than regulation of ammonia in for carrying out Flow-rate adjustment instead of ammonia, greatly reducing the ammonia cost in debugging stage
With.It is empty than the benefit calculation in regulation, 2600 yuan/ton of liquid ammonia material unit price according to existing ammonia；Each ammonia is empty to disappear ammonia than experiment
Ton/time of consumption 6；The people of operating personnel's quantity 4；Number of operations 4 times；The ammonia expense that wastes raw material altogether is 2600 yuan/ton × 6 ton/time × 4
People × 4 time=249600 yuan.
Also, air compressor 21 is only opened in debugging process to be simulated, therefore the institute in process of the test
The environmental pollution for being also air, reducing caused by the discharge of ammonia of discharge.And in above-mentioned simulation process, air compression
Machine 21 compresses the air of conveying without reaction and absorbs, can be all from the row of Reconstruction of End Gas Separator 40 in the process units of sealing
Go out, this way can get through technological process, pre-manufactured experiment is carried out using air dielectric before production, then testing
Can also show whether the air-tightness in numerical value judging device is good in journey according to the power of air compressor 21 and each flowmeter.
Presently preferred embodiments of the present invention is the foregoing is only, is not intended to limit the invention, it is all in essence of the invention
Any modification, equivalent and improvement made within god and principle etc., all should be included within protection scope of the present invention.
Claims (8)
1. a kind of double pressurized method nitric acid production plant, including ammonia feeding material component, air feeding material component, ammonia sky blender and tool
There is the Reconstruction of End Gas Separator of gas discharge outlet；Wherein,
The ammonia feeding material component includes the ammonia evaporator, ammonia superheater, the ammonia filter that are sequentially communicated by ammonia conveyance conduit, institute
The output end for stating ammonia filter is connected by ammonia conveyance conduit with the ammonia entrance of ammonia sky blender, is connecting the ammonia mistake
On ammonia conveyance conduit between hot device and ammonia filter ammonia control valve and ammonia atmospheric valve are disposed with along ammonia direction of transfer
Door；
The sky of air intake of the air feeding material component including air compressor machine, the output end for connecting the air compressor machine and ammonia sky blender
Letter shoot road；
The double pressurized method nitric acid production plant also includes gas pipeline, and the gas pipeline one end is arranged with the gas of Reconstruction of End Gas Separator
Outlet connection, the other end are connected on the ammonia conveyance conduit between ammonia control valve and ammonia superheater.
2. double pressurized method nitric acid production plant as claimed in claim 1, it is characterised in that the gas pipeline is provided with cut-off
Valve.
3. double pressurized method nitric acid production plant as claimed in claim 1 or 2, it is characterised in that the ammonia superheater is defeated with ammonia
Pipeline junction is sent to be provided with flange.
4. double pressurized method nitric acid production plant as claimed in claim 3, it is characterised in that be provided with blind plate on the flange.
5. double pressurized method nitric acid production plant as claimed in claim 1 or 2, it is characterised in that the gas pipeline is DN200
Pipeline.
6. double pressurized method nitric acid production plant as claimed in claim 1 or 2, it is characterised in that the gas of the Reconstruction of End Gas Separator
Body outlet is provided with three-way connection；First sub-interface of the three-way connection is connected with gas discharge outlet, the second sub-interface passes through
The gas pipeline is connected on the ammonia conveyance conduit between ammonia control valve and ammonia superheater, the 3rd sub-interface is used to discharge tail
Gas.
7. double pressurized method nitric acid production plant as claimed in claim 1 or 2, it is characterised in that on the ammonia conveyance conduit also
It is provided with ammonia pressure gauge, ammonia flow meter, ammonia thermometer between the ammonia control valve and ammonia emptying valve.
8. double pressurized method nitric acid production plant as claimed in claim 1 or 2, it is characterised in that on the airflow pipe
It is provided with air vent valve and air manometer, air thermometer, sky between the air vent valve and ammonia sky blender
Air-flow gauge.
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| Application Number | Priority Date | Filing Date | Title |
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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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| CN105217585B true CN105217585B (en) | 2017-06-23 |
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Families Citing this family (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 |
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