CN109579354A - A kind of method that nitric acid production enters stove air cooling and drying - Google Patents
A kind of method that nitric acid production enters stove air cooling and drying Download PDFInfo
- Publication number
- CN109579354A CN109579354A CN201811506122.2A CN201811506122A CN109579354A CN 109579354 A CN109579354 A CN 109579354A CN 201811506122 A CN201811506122 A CN 201811506122A CN 109579354 A CN109579354 A CN 109579354A
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- Prior art keywords
- air
- temperature
- compressed air
- restorer
- waste heat
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B27/00—Machines, plants or systems, using particular sources of energy
- F25B27/02—Machines, plants or systems, using particular sources of energy using waste heat, e.g. from internal-combustion engines
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B21/00—Nitrogen; Compounds thereof
- C01B21/20—Nitrogen oxides; Oxyacids of nitrogen; Salts thereof
- C01B21/38—Nitric acid
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B1/00—Methods of steam generation characterised by form of heating method
- F22B1/02—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers
- F22B1/18—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being a hot gas, e.g. waste gas such as exhaust gas of internal-combustion engines
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/27—Relating to heating, ventilation or air conditioning [HVAC] technologies
- Y02A30/274—Relating to heating, ventilation or air conditioning [HVAC] technologies using waste energy, e.g. from internal combustion engine
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
- Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Organic Chemistry (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Inorganic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The present invention relates to a kind of methods that nitric acid production enters stove air cooling and drying, comprising the following steps: a, air compressor machine outlet 220 DEG C of compressed airs the low pressure waste heat low-pressure steam that water is vaporized into pot that gives up is sent into steam pipe network, compressed air is reduced to 190 DEG C；B, two-stage temperature restorer and a water recirculator are concatenated after low pressure waste heat gives up pot, 190 DEG C of compressed air pass sequentially through two-stage temperature restorer after, enter back into water recirculator compressed air temperature be cooled to 40 DEG C, the moisture in air is condensed into liquid by gaseous state at this time, and degree of being air-dried improves；C, 40 DEG C of compressed air successively returns to two-stage temperature restorer again, and temperature is sent into oxidation furnace after being restored to 185 DEG C and is reacted；D, oxidation furnace is passed through ammonia, improves ammonia sky ratio to 9.55%, furnace temperature liter is maintained 870 DEG C.The present invention will be air-dried and improve ammonia sky ratio, can increase (60%) 45 ton of dust technology daily, and dust technology concentration is promoted 2%.
Description
Technical field
The invention belongs to the nitric acid manufacturing method in chemical technology field, in particular to a kind of nitric acid production enters stove air drop
The dry method of temperature.
Background technique
In existing nitric acid production, under same operating condition, how can increase the ammonia flow reacted into oxidation furnace, be to reach
The necessary condition of volume increase as long as there is ammoxidation at nitrogen oxides, then is absorbed reaction into nitric acid in absorption tower, then, add
This part ammonia nitric acid generated entered is exactly that the effect of the project embodies.
Gas ammonia and air mix according to a certain percentage, form ammonia sky gaseous mixture, air themperature and gas ammonia temperature determine ammonia
The temperature of empty gaseous mixture, for corresponding ammonia sky than there is corresponding reaction furnace temperature, aoxidizing furnace temperature at this time is that ammoxidation reaction is exothermic
The sum of the temperature of temperature and ammonia sky gaseous mixture.Gas ammonia oxidation reaction process is immutable, but the temperature of ammonia sky gaseous mixture can be with people
For change, the temperature of ammonia sky gaseous mixture is reduced within the allowable range by exchanging heat, is also equivalent to reduce oxidation furnace temperature,
In order to stablize oxidation furnace temperature, ammonia sky can be improved within the allowable range at this time than ratio, add ammonia to reach, increase ammonia oxygen
Change reacting dose, amount of nitrogen oxides required for rear workshop section will be promoted, and be absorbed reaction into nitric acid into absorption tower, reached increasing
Produce effect.
Summary of the invention
The object of the invention is to simultaneously again can a kind of energy-saving and offer nitric acid production in order to improve nitric acid yield
Enter the method for stove air cooling and drying.
Present invention employs following technical solutions:
A kind of method that nitric acid production enters stove air cooling and drying, comprising the following steps:
A, the useless pot of a low pressure waste heat is installed in setting on air compressor machine outlet air pipeline, is controlled useless pot liquid level with water pump, is utilized sky
The low-pressure steam that water is vaporized into the useless pot of low pressure waste heat is sent into low-pressure steam pipe network, pressure by 220 DEG C of compressed airs of press outlet
Contracting air is reduced to 190 DEG C by 220 DEG C by temperature after the useless pot of low pressure waste heat；
B, concatenate two-stage temperature restorer and a water recirculator after low pressure waste heat gives up pot, 190 DEG C of compressed air according to
It after the secondary temperature restorer by two-stage, enters back into water recirculator compressed air temperature is cooled to 40 DEG C, at this time in air
Moisture liquid is condensed by gaseous state, by valve pipe under pressure itself discharge system, reach the mesh for being air-dried dehumidifying
, the temperature restorer is substantially exactly heat exchanger；
B, it is cooled to 40 DEG C of compressed air and successively returns to two-stage temperature restorer again and exchange heat, compressed air after cooling
Heating is sent into oxidation furnace after being restored to 185 DEG C and is reacted；
C, oxidation furnace is passed through ammonia, improves ammonia sky ratio to 9.55%, furnace temperature liter is maintained 870 DEG C.
In technical solution of the present invention, air themperature is dropped by 210 DEG C (temperature that original compressed air enters oxidation furnace)
As low as 185 DEG C, being equal to reduces 25 DEG C the temperature of ammonia sky gaseous mixture, and (original ammonia sky is than corresponding temperature for 870 DEG C of script
Degree) oxidation furnace temperature also decline nearly 25 DEG C therewith, in order to stablize furnace temperature, be added to furnace ammonia amount within the allowable range at this time, mention
High ammonia sky ratio maintains 870 DEG C to 9.55%, by furnace temperature liter, reaches the ammonia amount for increasing the reaction of furnace internal oxidition under equal load, increases
Add yield.
The invention is a little: the useless pot of a low pressure is arranged in the outlet section of air compressor machine, by this thermal energy Partial Conversion
At low-pressure steam, air themperature can be reduced to 30 DEG C or so and low-pressure steam is used for other workshop sections, in addition passed through again
Cooler further reduces air themperature, makes the moisture condensation wherein contained at liquid, air-liquid separation, condensed water, which is discharged into, to follow
Ring pond, then air themperature after cooling is risen to 185 DEG C or so by temperature restorer, it is separated from air greatly to reach
Partially aqueous amount, reaches dry air, and the dust technology of higher concentration is obtained in the case where absorber portion same amount of water, daily may be used
Increase (60%) 45 ton of dust technology or so, promotes dust technology concentration 2% and so greatly reduce cost, it is competing to improve market
Strive rate.
Detailed description of the invention
Fig. 1 is process flow chart of the invention；
Fig. 2 is the structural schematic diagram of second level temperature restorer in Fig. 1.
Specific implementation method
As shown in Figure 1 and Figure 2, a kind of nitric acid production provided by the invention enters the method for stove air cooling and drying, including following step
It is rapid:
A, one Low Pressure Waste Heat Boiler of setting installation on four-in-one unit air compressor machine outlet air pipeline controls useless pot liquid with water pump
Position, it is using 220 DEG C of air compressor machine outlet temperature, the compressed air of pressure 0.35MPa, water is vaporized into Low Pressure Waste Heat Boiler is low
It presses steam to be sent into low-pressure steam pipe network, controls useless pot pressure in 0.4-0.5MPa, so that compressed air temperature be reduced by 220 DEG C
To 190 DEG C, the pressure of the compressed air of Low Pressure Waste Heat Boiler outlet at this time is decreased slightly as 0.346 MPa.
B, second level temperature restorer and level-one temperature restorer are sequentially connected in series in low pressure boiler rear end of giving up, level-one temperature is restored
A water recirculator is reconnected after device, 190 DEG C of compressed airs that waste heat boiler comes out pass through second level temperature restorer first
Tube side enter back into the tube side of level-one temperature restorer, subsequently into water recirculator.
Air themperature is cooled to 40 DEG C or so by water recirculator, the moisture in air is condensed by gaseous state at this time
Liquid, by valve pipe under pressure itself discharge system, achieve the purpose that be air-dried dehumidifying.
C, it is cooled to the shell side that 40 DEG C of compressed air successively returns to level-one temperature restorer and second level temperature restorer again,
Compressed air after cooling heating is restored to 185 DEG C (pressure is in 0.333 MPa at this time), and feeding oxidation furnace is reacted afterwards；
D, oxidation furnace is passed through ammonia, improves ammonia sky ratio to 9.55%, furnace temperature liter is maintained 870 DEG C.
In the present embodiment, air themperature is reduced to 185 DEG C by 220 DEG C, and being equal to reduces the temperature of ammonia sky gaseous mixture
25 DEG C (being in the prior art 191 DEG C or so into the temperature of oxidation furnace ammonia sky gaseous mixture), the oxidation furnace temperature of 870 DEG C of script
Decline nearly 25 DEG C therewith, in order to stablize furnace temperature, be added to furnace ammonia amount within the allowable range at this time, improves ammonia sky ratio to 9.55%
(ammonia sky ratio in the prior art is usually 9.2%), furnace temperature is risen to 870 DEG C, and (furnace temperature raising is due to this added part
Increment ammonia carries out when ammoxidation reaction heat release caused by increased temperature), reach and increases the reaction of furnace internal oxidition under equal load
Ammonia amount increases yield.
Moisture in air is condensed as temperature reduces, outlet, so that enter the reduction of stove air water content, it is same in absorber portion
The dust technology of higher concentration is obtained in the case where amount of water.
The present invention need to only increase several equipment, do not need additional material and participate in, merely by system itself medium energy
The conversion of amount, by-product 2-5 tons of low-pressure steams, both increase yield per hour, improve efficiency, and improve finished product acid concentration,
Reduce production cost.
Claims (1)
1. a kind of method that nitric acid production enters stove air cooling and drying, comprising the following steps:
A, the useless pot of a low pressure waste heat, 220 DEG C of compressed airs for utilizing air compressor machine to export are connected on air compressor machine outlet air pipeline
The low-pressure steam that water is vaporized into the useless pot of low pressure waste heat is sent into low-pressure steam pipe network, compressed air is given up by low pressure waste heat after pot
Temperature is reduced to 190 DEG C by 220 DEG C；
B, concatenate two-stage temperature restorer and a water recirculator after low pressure waste heat gives up pot, 190 DEG C of compressed air according to
It after the secondary temperature restorer by two-stage, enters back into water recirculator compressed air temperature is cooled to 40 DEG C, at this time in air
Moisture liquid is condensed by gaseous state, achieve the purpose that be air-dried dehumidifying；
C, it is cooled to 40 DEG C of compressed air and successively returns to two-stage temperature restorer again and exchange heat, compressed air after cooling
Heating is sent into oxidation furnace after being restored to 185 DEG C and is reacted；
D, oxidation furnace is passed through ammonia, improves ammonia sky ratio to 9.55%, furnace temperature liter is maintained 870 DEG C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811506122.2A CN109579354A (en) | 2018-12-10 | 2018-12-10 | A kind of method that nitric acid production enters stove air cooling and drying |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811506122.2A CN109579354A (en) | 2018-12-10 | 2018-12-10 | A kind of method that nitric acid production enters stove air cooling and drying |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109579354A true CN109579354A (en) | 2019-04-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811506122.2A Withdrawn CN109579354A (en) | 2018-12-10 | 2018-12-10 | A kind of method that nitric acid production enters stove air cooling and drying |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110721558A (en) * | 2019-11-18 | 2020-01-24 | 安徽金禾实业股份有限公司 | Method for drying and concentrating air entering furnace of nitric acid device |
| CN113198299A (en) * | 2021-04-21 | 2021-08-03 | 江苏科技大学 | Two-stage air compression and drying system and working method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201314288Y (en) * | 2008-11-26 | 2009-09-23 | 山东省药用玻璃股份有限公司 | Compressed air precooler |
| CN102502541A (en) * | 2011-10-21 | 2012-06-20 | 天津华景化工新技术开发有限公司 | Production method of high-concentration dilute nitric acid |
| CN205973803U (en) * | 2016-08-01 | 2017-02-22 | 四川金象赛瑞化工股份有限公司 | Low pressure waste boiler for nitric acid device |
| CN107940801A (en) * | 2017-10-23 | 2018-04-20 | 浙江大学 | A kind of space division system for recycling compressed air waste-heat |
-
2018
- 2018-12-10 CN CN201811506122.2A patent/CN109579354A/en not_active Withdrawn
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201314288Y (en) * | 2008-11-26 | 2009-09-23 | 山东省药用玻璃股份有限公司 | Compressed air precooler |
| CN102502541A (en) * | 2011-10-21 | 2012-06-20 | 天津华景化工新技术开发有限公司 | Production method of high-concentration dilute nitric acid |
| CN205973803U (en) * | 2016-08-01 | 2017-02-22 | 四川金象赛瑞化工股份有限公司 | Low pressure waste boiler for nitric acid device |
| CN107940801A (en) * | 2017-10-23 | 2018-04-20 | 浙江大学 | A kind of space division system for recycling compressed air waste-heat |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110721558A (en) * | 2019-11-18 | 2020-01-24 | 安徽金禾实业股份有限公司 | Method for drying and concentrating air entering furnace of nitric acid device |
| CN113198299A (en) * | 2021-04-21 | 2021-08-03 | 江苏科技大学 | Two-stage air compression and drying system and working method thereof |
| CN113198299B (en) * | 2021-04-21 | 2022-10-25 | 江苏科技大学 | Two-stage air compression and drying system and working method thereof |
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Application publication date: 20190405 |
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