CN205187873U - Dual pressure dilute nitric acid device - Google Patents
Dual pressure dilute nitric acid device Download PDFInfo
- Publication number
- CN205187873U CN205187873U CN201520903643.7U CN201520903643U CN205187873U CN 205187873 U CN205187873 U CN 205187873U CN 201520903643 U CN201520903643 U CN 201520903643U CN 205187873 U CN205187873 U CN 205187873U
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- ammonia
- gas
- pipeline
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- superheater
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
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Abstract
The utility model relates to a dual pressure dilute nitric acid device makes the device increase output at high temperature season, improves heat recovery efficiency simultaneously. Export of ammonia evaporator gas ammonia and second ammonia over heater cold fluid inlet intercommunication, cold fluid issuing of second ammonia over heater and first ammonia over heater cold fluid inlet intercommunication, export of ammonia evaporator gas ammonia and first ammonia over heater cold fluid inlet intercommunication, ammonia filter gas ammonia entry and the cold fluid issuing intercommunication of first ammonia over heater, export of tail gas expander tail gas and second ammonia over heater hot -fluid entry intercommunication, air cleaner, blowing and dehumidifying device, axial flow compressor connect gradually, air cleaner gas outlet and air -blower gas access intercommunication, air -blower gas outlet and heat exchanger hot -fluid entry intercommunication, export of heat exchanger hot -fluid and defroster entry intercommunication, defroster export and axial flow compressor entry intercommunication, the cold fluid inlet of the cold fluid issuing of heat exchanger, cold water pump, refrigerating unit, heat exchanger feeds through in proper order.
Description
Technical field
The utility model relates to a kind of double pressurized method dust technology device.
Background technology
Double pressurizing method of nitric acid plant adopts double pressurized method to produce nitric acid, as application number be 201420293262.7, name is called the Chinese patent of double pressurized method nitric acid production plant.
There is following shortcoming in current double pressurizing method of nitric acid plant:
1, when high temperature season, output does not reach design mean value, and its major cause is by the impact on the low side of the air axial compressor inflate quantity in " four-in-one unit ", thus constrains the nitric acid production of production equipment.
2, in the rare nitre device of two pressurization tail gas turbine machine due to design reasons, the temperature of its outlet NOx tail gas is general all higher than design load 105 DEG C, some device is then up to more than 170 DEG C, former Ф 1.2 × 62 meters of tail gas funnels that are directly sent to of this high-temperature tail gas carry out high altitude discharge, and the low temperature heat energy of tail gas fails fully to recycle.The higher major cause of exhaust temperature is 1, because the waste heat boiler Outlet Gas Temperature in device is high 480 DEG C, causes the higher 370-380 DEG C of tail saturating import NOx exhaust temperature; 2, also there is a certain distance with design load in the actual heat recovery efficiency of tail gas turbine machine simultaneously, therefore cause outlet exhaust temperature high phenomenon.
Utility model content
The purpose of this utility model is to overcome above shortcomings in prior art, and provides a kind of double pressurized method dust technology device reasonable in design, makes device at high temperature season increase yield, improves energy recovery efficiency simultaneously.
The technical scheme in the invention for solving the above technical problem is: a kind of double pressurized method dust technology device, comprises ammonia evaporator, ammonia strainer, mixing tank, converter for ammonia oxidation, waste heat boiler, High Temperature Gas interchanger, low pressure reaction water cooler, nitric oxide separator, nitrogen oxide gas compressor, the first tail gas pre-heater, reaction under high pressure water cooler, absorption tower, bleaching tower, Reconstruction of End Gas Separator, water cooler, the second tail gas pre-heater, ammonia reduction reactor, off-gas expander, ammonia superheater device, air filter and axial compressor;
Ammonia evaporator, ammonia strainer, mixing tank, converter for ammonia oxidation, waste heat boiler, High Temperature Gas interchanger, low pressure reaction water cooler, nitric oxide separator, nitrogen oxide gas compressor, the first tail gas pre-heater, reaction under high pressure water cooler, absorption tower, bleaching tower connect successively; Air filter, axial compressor, mixing tank connect successively; Absorption tower, Reconstruction of End Gas Separator, water cooler, the second tail gas pre-heater, ammonia reduction reactor, off-gas expander, ammonia superheater device connect successively; Bleaching tower is also connected with nitrogen oxide gas compressor and axial compressor; Absorption tower is also connected with nitric oxide separator;
It is characterized in that:
Described ammonia superheater device comprises the first ammonia superheater and the second ammonia superheater; The gas ammonia outlet of ammonia evaporator is communicated with the cold fluid inlet of the second ammonia superheater; The cold fluid outlet of the second ammonia superheater is communicated with the cold fluid inlet of the first ammonia superheater; The gas ammonia outlet of ammonia evaporator is communicated with the cold fluid inlet of the first ammonia superheater; The gas ammonia entrance of ammonia strainer is communicated with the cold fluid outlet of the first ammonia superheater; The offgas outlet of off-gas expander is communicated with the thermal fluid inlet of the second ammonia superheater;
Also comprise air blow for removing moisture device, air blow for removing moisture device comprises gas blower, interchanger, mist eliminator, water supply pump and unit cooler; Air blow for removing moisture device is arranged between air filter and axial compressor, and air filter, air blow for removing moisture device, axial compressor connect successively; The pneumatic outlet of air filter is communicated with the gas inlet of gas blower; The pneumatic outlet of gas blower is communicated with the thermal fluid inlet of interchanger; The hot fluid outlet ports of interchanger is communicated with the entrance of mist eliminator; The outlet of mist eliminator is communicated with the entrance of axial compressor; The cold fluid inlet of the cold fluid outlet of interchanger, water supply pump, unit cooler, interchanger is communicated with successively.
Ammonia superheater device described in the utility model also comprises the first air inlet ammonia pipeline, the second air inlet ammonia pipeline, the 3rd air inlet ammonia pipeline, deammoniation strainer pipeline, chimney pipeline, NOx tail gas pipeline; The gas ammonia outlet of first air inlet ammonia pipeline one end and ammonia evaporator, the other end is communicated with the cold fluid inlet of the second ammonia superheater; Second air inlet ammonia pipeline one end is communicated with the cold fluid outlet of the second ammonia superheater, and the other end is communicated with the cold fluid inlet of the first ammonia superheater; The gas ammonia outlet of the 3rd air inlet ammonia pipeline one end and ammonia evaporator, the other end is communicated with the cold fluid inlet of the first ammonia superheater; Deammoniation strainer pipeline one end is communicated with the gas ammonia entrance of ammonia strainer, and the other end is communicated with the cold fluid outlet of the first ammonia superheater; NOx tail gas pipeline one end is communicated with the offgas outlet of off-gas expander, and the other end is communicated with the thermal fluid inlet of the second ammonia superheater; The hot fluid outlet ports of chimney pipeline and the second ammonia superheater.
Ammonia superheater device described in the utility model also comprises tail gas bypass; Tail gas bypass one end and NOx tail gas pipeline connection, the other end and chimney pipeline connection.
The utility model is all provided with valve on the first described air inlet ammonia pipeline, the second air inlet ammonia pipeline, the 3rd air inlet ammonia pipeline, deammoniation strainer pipeline, chimney pipeline, tail gas bypass, NOx tail gas pipeline.
Air blow for removing moisture device described in the utility model also comprises expansion tank; Expansion tank is connected with the water supplement port of interchanger.
Air blow for removing moisture device described in the utility model also comprises hydathode and drain box, and the water port of interchanger, hydathode, drain box connect successively.
The utility model compared with prior art, has the following advantages and effect:
One, after adopting air blow for removing moisture device, make double pressurized method dust technology device output also reach yield design value level when summer high temperature season, make that the ammonia of production equipment consume, the reduction of steam consumption simultaneously, further save energy and reduce the cost.Freezing dehumidifying device makes the temperature of air axial compressor inlet air remain on 7-9.5 DEG C for a long time, and the air input of compressor has had obvious lifting about 10%, and top hole pressure is corresponding brings up to more than 0.32MPa by 0.27MPa; The moisture content removed in air is about 1t/h, makes the mean concns of the low pressure reaction water cooler place condensation acid of device improve about 1%.Main following good result: 1, the 3.9MPa of device, 420 DEG C of corresponding meetings of high pressure steam steam consumption reduce 0.6-1.2t/h to some extent, on average about 1t/h.2, when summer, axial compressor entrance maximum quantity of wind is 860Nm3/min, minimumly also may be down to about 800Nm3/min; And in season in spring and autumn, axial compressor entrance maximum quantity of wind can reach about 980Nm3/min, minimum difference 116Nm3/h.Dehumidifying device is after coming into operation, and axial compressor entering air temperature is down to 10 DEG C, and output can reach the level in season in spring and autumn, and 60% nitric acid annual production will increase by 10%, namely more than 6000 tons.
Two, ammonia superheater device adopts two superheater structure, utilizes the low-temp tail gas heat energy of former direct smoke stack emission, saves device 0.6MPa, 160 DEG C of low-pressure steam consumptions are about 0.7t/h, improve the heat energy comprehensive reutilization rate of whole production equipment.After transformation, the two Nitric Acid Device of 100kt/a, can save 0.6MPa, and 160 DEG C of low-pressure steam consume mean value 0.7t/h(and heat 999190kJ/h).
Tail gas turbine machine outlet NOx exhaust temperature in the rare nitre device of current domestic two pressurization is all higher compared with design load 105 DEG C, general at >=140 DEG C, about 170 DEG C are reached before transformation, the tail gas tolerance of 100kt/a device is about 55000Nm3/h, it is directly sent to the direct high altitude discharge of chimney of 62 meters high, causes a large amount of thermal waste phenomenon thus.For improving the heat energy recycle rate of whole production equipment, heat exchange is utilized to recycle the low-temperature heat quantity of this part tail gas further.Need heat to heat to gas ammonia with the ammonia superheater in timer, use 0.6MPa, 160 DEG C of low-pressure steam, heat source medium is changed into NOx tail gas to heat gas ammonia, correspondingly just save this part steam consumption, thus reach energy-saving and cost-reducing object.
Accompanying drawing explanation
Fig. 1 is the structural representation of the utility model embodiment.
Fig. 2 is the structural representation of the utility model embodiment ammonia superheater device.
Fig. 3 is the structural representation of the utility model embodiment air blow for removing moisture device.
Embodiment
Below in conjunction with accompanying drawing, also by embodiment, the utility model is described in further detail, and following examples are that the utility model is not limited to following examples to explanation of the present utility model.
See Fig. 1 ~ Fig. 3, the utility model comprises ammonia evaporator 1, ammonia strainer 2, mixing tank 3, converter for ammonia oxidation 4, waste heat boiler 5, High Temperature Gas interchanger 6, low pressure reaction water cooler 7, nitric oxide separator 8, nitrogen oxide gas compressor 9, first tail gas pre-heater 10, reaction under high pressure water cooler 11, absorption tower 12, bleaching tower 13, Reconstruction of End Gas Separator 14, water cooler 15, second tail gas pre-heater 16, ammonia reduction reactor 17, off-gas expander 18, ammonia superheater device 19, air filter 20, air blow for removing moisture device 21, axial compressor 22.
Ammonia evaporator 1, ammonia strainer 2, mixing tank 3, converter for ammonia oxidation 4, waste heat boiler 5, High Temperature Gas interchanger 6, low pressure reaction water cooler 7, nitric oxide separator 8, nitrogen oxide gas compressor 9, first tail gas pre-heater 10, reaction under high pressure water cooler 11, absorption tower 12, bleaching tower 13 connect successively.
Air filter 20, air blow for removing moisture device 21, axial compressor 22, mixing tank 3 connect successively.
Absorption tower 12, Reconstruction of End Gas Separator 14, water cooler 15, second tail gas pre-heater 16, ammonia reduction reactor 17, off-gas expander 18, ammonia superheater device 19 connect successively.
Bleaching tower 13 is also connected with nitrogen oxide gas compressor 9 and axial compressor 22.
Absorption tower 12 is also connected with nitric oxide separator 8.
Ammonia superheater device 19 comprises the first ammonia superheater 23, second ammonia superheater 24, first air inlet ammonia pipeline 25, second air inlet ammonia pipeline the 26, the 3rd air inlet ammonia pipeline 27, deammoniation strainer pipeline 28, chimney pipeline 29, tail gas bypass 30, NOx tail gas pipeline 31.
The gas ammonia outlet of first air inlet ammonia pipeline 25 one end and ammonia evaporator 1, the other end is communicated with the cold fluid inlet of the second ammonia superheater 24, and the gas ammonia outlet of such ammonia evaporator 1 is communicated with the cold fluid inlet of the second ammonia superheater 24.Gas ammonia from ammonia evaporator is sent into the second ammonia superheater 24, second ammonia superheater 24 this gas ammonia overheated by the first air inlet ammonia pipeline 25.
Second air inlet ammonia pipeline 26 one end is communicated with the cold fluid outlet of the second ammonia superheater 24, and the other end is communicated with the cold fluid inlet of the first ammonia superheater 23, and the cold fluid outlet of such second ammonia superheater 24 is communicated with the cold fluid inlet of the first ammonia superheater 23.Gas ammonia after overheated for second ammonia superheater 24 is sent into the first ammonia superheater 23, first ammonia superheater 23 after this gas ammonia of heat by the second air inlet ammonia pipeline 26.
The gas ammonia outlet of the 3rd air inlet ammonia pipeline 27 one end and ammonia evaporator 1, the other end is communicated with the cold fluid inlet of the first ammonia superheater 23, and the gas ammonia outlet of such ammonia evaporator 1 is communicated with the cold fluid inlet of the first ammonia superheater 23.If desired, it is overheated that the gas ammonia from ammonia evaporator 1 can directly be sent into the first ammonia superheater 23 by the 3rd air inlet ammonia pipeline 27, do not need to process through the second ammonia superheater 24.
Deammoniation strainer pipeline 28 one end is communicated with the gas ammonia entrance of ammonia strainer 2, and the other end is communicated with the cold fluid outlet of the first ammonia superheater 23, and the gas ammonia entrance of such ammonia strainer 2 is communicated with the cold fluid outlet of the first ammonia superheater 23.Gas ammonia after overheated for first ammonia superheater 23 is sent into ammonia strainer by deammoniation strainer pipeline 28.
NOx tail gas pipeline 31 one end is communicated with the offgas outlet of off-gas expander 18, and the other end is communicated with the thermal fluid inlet of the second ammonia superheater 24, and the offgas outlet of such off-gas expander 18 is communicated with the thermal fluid inlet of the second ammonia superheater 24.NOx tail gas from off-gas expander 18 is sent into the second ammonia superheater 24 as hot-fluid for gas ammonia provides heat by NOx tail gas pipeline 31.
Chimney pipeline 29 is communicated with the hot fluid outlet ports of the second ammonia superheater 24.NOx tail gas after second ammonia superheater 24 utilizes by chimney pipeline 29 sends into rare smoke of gunpowder chimney.
Tail gas bypass 30 one end is communicated with NOx tail gas pipeline 31, and the other end is communicated with chimney pipeline 29.Tail gas bypass 30 effect goes blowdown after being drawn by the dirt in NOx tail gas pipeline 31 and chimney pipeline 29.
First ammonia superheater 23 adopts the low-pressure steam of pipe network as hot-fluid for gas ammonia provides heat, and the second ammonia superheater 24 adopts NOx tail gas as hot-fluid for gas ammonia provides heat.
First air inlet ammonia pipeline 25, second air inlet ammonia pipeline the 26, the 3rd air inlet ammonia pipeline 27, deammoniation strainer pipeline 28, chimney pipeline 29, tail gas bypass 30, NOx tail gas pipeline 31 are all provided with valve, for the opening and closing of pilot piping.
Air blow for removing moisture device 21 comprises gas blower 32, interchanger 33, mist eliminator 34, hydathode 35, expansion tank 36, drain box 37, water supply pump 38, unit cooler 39.
The pneumatic outlet of air filter 20 is communicated with the gas inlet of gas blower 32.Under the effect of gas blower 32, raw air flow velocity increases.
The pneumatic outlet of gas blower 32 is communicated with the thermal fluid inlet of interchanger 33.Raw air in interchanger 33 with refrigerated water heat exchange, raw air lower the temperature.
The hot fluid outlet ports of interchanger 33 is communicated with the entrance of mist eliminator 34.Mist eliminator 34 pairs of raw airs carry out dehumidification treatments.
The outlet of mist eliminator 34 is communicated with the entrance of axial compressor 22.
The cold fluid inlet of the cold fluid outlet of interchanger 33, water supply pump 38, unit cooler 39, interchanger 33 is communicated with successively.Refrigerated water after interchanger 33 heat exchange is sent into unit cooler 39 by water supply pump 38, again sends into interchanger 33 and participate in heat exchange as cold fluid after unit cooler 39 pairs of refrigerated water refrigeration.
Expansion tank 36 is connected with the water supplement port of interchanger 33, for supplementary refrigerated water.
The water port of interchanger 33, hydathode 35, drain box 37 connect successively, and the water of condensation of interchanger 33 is entered drain box 37 by hydathode 35, and water of condensation is sent into condensing hot air furnace pond by drain box 37.
In ammonia superheater and interchanger, hot-fluid provides heat for cold fluid, and hot fluid temperature reduces, and cooling fluid temperature raises, and this concept is the common practise of this area.
In addition, it should be noted that, the specific embodiment described in this specification sheets, the shape, institute's title of being named etc. of its parts and components can be different, and the above content described in this specification sheets is only to the explanation of the utility model structure example.
Claims (6)
1. a double pressurized method dust technology device, comprises ammonia evaporator, ammonia strainer, mixing tank, converter for ammonia oxidation, waste heat boiler, High Temperature Gas interchanger, low pressure reaction water cooler, nitric oxide separator, nitrogen oxide gas compressor, the first tail gas pre-heater, reaction under high pressure water cooler, absorption tower, bleaching tower, Reconstruction of End Gas Separator, water cooler, the second tail gas pre-heater, ammonia reduction reactor, off-gas expander, ammonia superheater device, air filter and axial compressor;
Ammonia evaporator, ammonia strainer, mixing tank, converter for ammonia oxidation, waste heat boiler, High Temperature Gas interchanger, low pressure reaction water cooler, nitric oxide separator, nitrogen oxide gas compressor, the first tail gas pre-heater, reaction under high pressure water cooler, absorption tower, bleaching tower connect successively; Air filter, axial compressor, mixing tank connect successively; Absorption tower, Reconstruction of End Gas Separator, water cooler, the second tail gas pre-heater, ammonia reduction reactor, off-gas expander, ammonia superheater device connect successively; Bleaching tower is also connected with nitrogen oxide gas compressor and axial compressor; Absorption tower is also connected with nitric oxide separator;
It is characterized in that:
Described ammonia superheater device comprises the first ammonia superheater and the second ammonia superheater; The gas ammonia outlet of ammonia evaporator is communicated with the cold fluid inlet of the second ammonia superheater; The cold fluid outlet of the second ammonia superheater is communicated with the cold fluid inlet of the first ammonia superheater; The gas ammonia outlet of ammonia evaporator is communicated with the cold fluid inlet of the first ammonia superheater; The gas ammonia entrance of ammonia strainer is communicated with the cold fluid outlet of the first ammonia superheater; The offgas outlet of off-gas expander is communicated with the thermal fluid inlet of the second ammonia superheater;
Also comprise air blow for removing moisture device, air blow for removing moisture device comprises gas blower, interchanger, mist eliminator, water supply pump and unit cooler; Air blow for removing moisture device is arranged between air filter and axial compressor, and air filter, air blow for removing moisture device, axial compressor connect successively; The pneumatic outlet of air filter is communicated with the gas inlet of gas blower; The pneumatic outlet of gas blower is communicated with the thermal fluid inlet of interchanger; The hot fluid outlet ports of interchanger is communicated with the entrance of mist eliminator; The outlet of mist eliminator is communicated with the entrance of axial compressor; The cold fluid inlet of the cold fluid outlet of interchanger, water supply pump, unit cooler, interchanger is communicated with successively.
2. double pressurized method dust technology device according to claim 1, is characterized in that: described ammonia superheater device also comprises the first air inlet ammonia pipeline, the second air inlet ammonia pipeline, the 3rd air inlet ammonia pipeline, deammoniation strainer pipeline, chimney pipeline, NOx tail gas pipeline; The gas ammonia outlet of first air inlet ammonia pipeline one end and ammonia evaporator, the other end is communicated with the cold fluid inlet of the second ammonia superheater; Second air inlet ammonia pipeline one end is communicated with the cold fluid outlet of the second ammonia superheater, and the other end is communicated with the cold fluid inlet of the first ammonia superheater; The gas ammonia outlet of the 3rd air inlet ammonia pipeline one end and ammonia evaporator, the other end is communicated with the cold fluid inlet of the first ammonia superheater; Deammoniation strainer pipeline one end is communicated with the gas ammonia entrance of ammonia strainer, and the other end is communicated with the cold fluid outlet of the first ammonia superheater; NOx tail gas pipeline one end is communicated with the offgas outlet of off-gas expander, and the other end is communicated with the thermal fluid inlet of the second ammonia superheater; The hot fluid outlet ports of chimney pipeline and the second ammonia superheater.
3. double pressurized method dust technology device according to claim 2, is characterized in that: described ammonia superheater device also comprises tail gas bypass; Tail gas bypass one end and NOx tail gas pipeline connection, the other end and chimney pipeline connection.
4. double pressurized method dust technology device according to claim 3, is characterized in that: on the first described air inlet ammonia pipeline, the second air inlet ammonia pipeline, the 3rd air inlet ammonia pipeline, deammoniation strainer pipeline, chimney pipeline, tail gas bypass, NOx tail gas pipeline, be all provided with valve.
5. double pressurized method dust technology device according to claim 1, is characterized in that: described air blow for removing moisture device also comprises expansion tank; Expansion tank is connected with the water supplement port of interchanger.
6. double pressurized method dust technology device according to claim 1, is characterized in that: described air blow for removing moisture device also comprises hydathode and drain box, and the water port of interchanger, hydathode, drain box connect successively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520903643.7U CN205187873U (en) | 2015-11-13 | 2015-11-13 | Dual pressure dilute nitric acid device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520903643.7U CN205187873U (en) | 2015-11-13 | 2015-11-13 | Dual pressure dilute nitric acid device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205187873U true CN205187873U (en) | 2016-04-27 |
Family
ID=55780889
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520903643.7U Withdrawn - After Issue CN205187873U (en) | 2015-11-13 | 2015-11-13 | Dual pressure dilute nitric acid device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205187873U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105314611A (en) * | 2015-11-13 | 2016-02-10 | 杭州龙山化工有限公司 | Dilute nitric acid device adopting double pressure method |
| CN110382412A (en) * | 2017-03-07 | 2019-10-25 | 卡萨尔公司 | For producing the device, correlation technique and remodeling method of nitric acid |
-
2015
- 2015-11-13 CN CN201520903643.7U patent/CN205187873U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105314611A (en) * | 2015-11-13 | 2016-02-10 | 杭州龙山化工有限公司 | Dilute nitric acid device adopting double pressure method |
| CN105314611B (en) * | 2015-11-13 | 2018-04-06 | 杭州龙山化工有限公司 | A kind of double pressurized method dust technology device |
| CN110382412A (en) * | 2017-03-07 | 2019-10-25 | 卡萨尔公司 | For producing the device, correlation technique and remodeling method of nitric acid |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20160427 Effective date of abandoning: 20180406 |