CN105169918A - Method and system for reducing emission of nitrogen oxide in smoke of coking furnace - Google Patents
Method and system for reducing emission of nitrogen oxide in smoke of coking furnace Download PDFInfo
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- CN105169918A CN105169918A CN201510633379.4A CN201510633379A CN105169918A CN 105169918 A CN105169918 A CN 105169918A CN 201510633379 A CN201510633379 A CN 201510633379A CN 105169918 A CN105169918 A CN 105169918A
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- reducing agent
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Abstract
The invention relates to a method and a system for reducing emission of nitrogen oxide in smoke of a coking furnace. The system comprises a reducing agent storing and premixing device, a reducing agent spraying device and denitration reaction space, wherein the denitration reaction space is located in an area, having the temperature of 870 DEG C-970 DEG C, in a regenerative chamber of the coking furnace; the reducing agent spraying device is arranged at the top of the denitration reaction space, one side, outside the coking furnace, of the reducing agent spraying device is connected with the reducing agent storing and premixing device through a connecting pipeline I, and a first cutoff valve is arranged on the first connecting pipeline I; the reducing agent spraying device is additionally connected with a compressed air pipeline through a connecting pipeline II, and a second cutoff valve is arranged on the second connecting pipeline II. Coking wastewater such as residual ammonia water, ammonia distillation wastewater and the like is taken as a reducing agent and sprayed in the denitration reaction space of the regenerative chamber of the coking furnace after being preheated, active ingredients in the wastewater sufficiently react with nitrogen oxide in the smoke, and emission of the coking wastewater can further be controlled while emission of nitrogen oxide in the smoke of the coking furnace is controlled; the initial investment is small, the operation cost is low, and energy conservation and environmental protection are realized.
Description
Technical field
The present invention relates to coke oven flue gas pollutant emission control technology field, particularly relate to a kind of method and system not using catalyst can reduce coke oven flue gas discharged nitrous oxides.
Background technology
Coking industry energy consumption is high, seriously polluted, but but pays little attention to the Environmental capacity of the industry, and especially the pollution problem of coke oven nitrogen oxide is unresolved all the time.Being defined in coke oven discharged nitrous oxides concentration newly-built after 2015 in " coking chemistry emission of industrial pollutants standard " (GB16171-2012) that 2012 implement must not more than 500mg/m
3.Current most independent coal chemical enterprise, the NO in coke oven smoke stack emission flue gas
xcontent is all at 800mg/m
3above, far exceed national standard, therefore must take effective coke oven flue gas method of denitration, reduce the discharge capacity of the nitrogen oxide produced in process of coking.
In coke oven flue gas the source of nitrogen oxide mainly coal gas and excess air after preheating, enter combustion chamber carry out mixed combustion, the nitrogen in the air that the high temperature of generation causes and excessive oxygen generation oxidation reaction generate NO
xcause, under current coke oven construction, be difficult to fundamentally reduce below its generation to discharge standard.
Coke oven flue gas from decline flue out after through chute arrive through regenerator top, its temperature is at 1200 DEG C to 1320 DEG C, oxygen content is more than 4.7%, and in the present context, ammonia and urea etc. can generate a large amount of nitrogen oxide with waste gas generation oxidation reaction containing ammonia liquid etc.
In the prior art, the SCR technology of the denitration employing of coke oven combustion waste gas, uses catalyst or catalytic unit to carry out denitration after exhaust gas disc in main chimney flue.Adopt existing denitrating technique to need to increase catalyst or catalytic unit, catalyst need regularly be changed, and also needs to arrange high-temperature blower, and therefore the construction investment of this technology is large, and operating cost is high.
Coking chemical waste water is that coke-oven plant produces in coking, gas purification and chemical products removal process, and its composition is complicated, concentration of harmful substance is high, toxicity is large and be difficult to process, and causes water pollution.Wastewater source more than half is by the remained ammonia produced in the dry distillation of coal and coal gas cooling procedure; Higher with the distilled ammonia wastewater pollutant levels of distilled ammonia wastewater form discharge after ammonia still process, could discharge after needing subsequent treatment.
Summary of the invention
The invention provides a kind of method and system reducing coke oven flue gas discharged nitrous oxides, utilize the coking chemical waste water such as remained ammonia and distilled ammonia wastewater as reducing agent, spray in the denitration reaction space of coke oven regenerator after preheating, nitrogen oxide in active component wherein and flue gas fully reacts, while control coke oven flue gas discharged nitrous oxides, also can control the discharge of coking chemical waste water; Initial investment is little, and operating cost is low, energy-conserving and environment-protective.
In order to achieve the above object, the present invention realizes by the following technical solutions:
Reduce a method for coke oven flue gas discharged nitrous oxides, comprise the steps:
1) coke oven stove peripheral hardware reducing agent stores and pre-mixing apparatus, establishes denitration reaction space and reducing agent jetting device in stove;
2) distilled ammonia wastewater in reducing agent storage and pre-mixing apparatus after blending and the mixed solution of remained ammonia make reducing agent, and its active component is ammonia, and containing ammonia density in reducing agent is 0.5 ~ 2%;
3) during coke oven work, the flue gas of the coal gas of ascending air and air and down current is commutated by exchange transmission gear timing, when exchange transmission gear changes exhaust gas disc open and-shut mode, air-flow in coke oven regenerator is to when becoming decline from rising, open reducing agent storage and the first stop valve between pre-mixing apparatus and reducing agent jetting device in connecting pipe one, liquid reducing agent is made to enter reducing agent jetting device, utilize the reducing agent in the heat water back of brick and flue gas in coke oven regenerator, reducing agent is fully vaporized;
4) be injected in denitration reaction space by reducing agent jetting device after the abundant preheating vaporization of reducing agent, it is the region of 870-970 DEG C that denitration reaction is spatially located at temperature in coke oven regenerator, the time of staying of reducing agent in denitration reaction space is 0.2 ~ 2s, and ammonia nitrogen ratio controls 1.5 ~ 2.0; Ammonia in reducing agent and the reaction of nitrogen oxides in flue gas, realize the purification of coke oven flue gas denitration and coking chemical waste water;
5) close the first stop valve, stop passing into reducing agent, open the second stop valve in connecting pipe two between reducing agent jetting device and compressed air piping, start to pass into compressed air; When air flow direction in coke oven regenerator becomes rising from decline, close the second stop valve, stop passing into compressed air;
6) above process repeats, action switching signal Synchronization Control first stop valve exported by exchange transmission gear by control system, the switching action of the second stop valve.
For realizing a kind of system reducing the method for coke oven flue gas discharged nitrous oxides, comprise reducing agent to store and pre-mixing apparatus, reducing agent jetting device and denitration reaction space, it is the region of 870-970 DEG C that described denitration reaction is spatially located at temperature in coke oven regenerator, reducing agent jetting device is arranged on denitration reaction top of space, its side outside coke oven stores with reducing agent and pre-mixing apparatus is connected by connecting pipe one, connecting pipe one is established the first stop valve; Reducing agent jetting device is connected by connecting pipe two with compressed air piping in addition, connecting pipe two is established the second stop valve.
Described reducing agent store and pre-mixing apparatus by distilled ammonia wastewater storage device, remained ammonia storage device, for subsequent usely to form containing ammonia liquid storage device, reducing agent pre-mixing apparatus, distilled ammonia wastewater storage device, remained ammonia storage device, for subsequent usely connect reducing agent pre-mixing apparatus respectively containing ammonia liquid storage device.
The side of described reducing agent jetting device outside coke oven is also provided with diffusion valve and pressure monitoring table.
Described first stop valve and the second stop valve connection control system respectively, control system connects the motion detection sensing device in coke furnace system on exchange transmission gear in addition.
Described control system is PLC or single-chip microcomputer.
Compared with prior art, the invention has the beneficial effects as follows:
1) utilize the coking chemical waste water such as remained ammonia and distilled ammonia wastewater as reducing agent, do not need to use catalyst and reducing agent pretreatment unit, while control coke oven flue gas discharged nitrous oxides, also can control the discharge of coking chemical waste water;
2) reducing agent sprays in the denitration reaction space of coke oven regenerator after preheating, can keep the pipeline pressure of reducing agent jetting device, have certain initial velocity when making reducing agent spray into denitration reaction space, ensure mixing uniformity after reducing agent vaporization;
3) controlling ammonia nitrogen than being 1.5-2.0, effectively can avoid the escaping of ammonia that ammonia and reaction of nitrogen oxides not exclusively cause;
4) denitration reaction is spatially located at temperature range in coke oven regenerator is the region of 870-970 DEG C, and coke oven combustion flue gas steady residence time in denitration reaction space can be made to remain on 0.5-2s; Meanwhile, in denitration reaction space, coke oven combustion flue-gas temperature can not go out to have aobvious decline; Ensure that the active component in reducing agent and the nitrogen oxide in flue gas fully react;
5) pass into the reducing agent that compressed-air actuated object is in emptying reducing agent jetting device, when preventing that in coke oven regenerator 05, air flow direction becomes rising, ammonia residual in reducing agent jetting device enters combustion chamber with air-flow, produces nitrogen oxide;
6) equipment initial investment is little, and operating cost is low, energy-conserving and environment-protective.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Fig. 2 is the denitration efficiency curve map of the embodiment of the present invention.
In figure: 1. reducing agent store and pre-mixing apparatus 2. compressed air piping 3. reducing agent jetting device 4. denitration reaction space 5. coke oven regenerator 6. first stop valve 7. second stop valve 8. pressure monitoring instrument 9. diffusion valve 10. reducing agent pre-mixing apparatus 11. distilled ammonia wastewater storage device 12. remained ammonia storage device 13. for subsequent use containing ammonia liquid storage device 14. connecting pipe 1 connecting pipe two
Detailed description of the invention
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described further:
Seeing Fig. 1, is structural representation of the present invention, and a kind of method reducing coke oven flue gas discharged nitrous oxides of the present invention, comprises the steps:
1) coke oven stove peripheral hardware reducing agent stores and pre-mixing apparatus 1, establishes denitration reaction space 4 and reducing agent jetting device 3 in stove;
2) distilled ammonia wastewater in reducing agent storage and pre-mixing apparatus 1 after blending and the mixed solution of remained ammonia make reducing agent, and its active component is ammonia, and containing ammonia density in reducing agent is 0.5 ~ 2%;
3) during coke oven work, the flue gas of the coal gas of ascending air and air and down current is commutated by exchange transmission gear timing, when exchange transmission gear changes exhaust gas disc open and-shut mode, air-flow in coke oven regenerator 5 is to when becoming decline from rising, open reducing agent storage and the first stop valve 6 between pre-mixing apparatus 1 and reducing agent jetting device 3 in connecting pipe 1, liquid reducing agent is made to enter reducing agent jetting device 3, utilize the reducing agent in the heat water back of brick and flue gas in coke oven regenerator 5, reducing agent is fully vaporized;
4) be injected in denitration reaction space 4 by reducing agent jetting device 3 after the abundant preheating vaporization of reducing agent, denitration reaction space 4 is positioned at the region that coke oven regenerator 5 temperature is 870-970 DEG C, the time of staying of reducing agent in denitration reaction space 4 is 0.2 ~ 2s, and ammonia nitrogen ratio controls 1.5 ~ 2.0; Ammonia in reducing agent and the reaction of nitrogen oxides in flue gas, realize the purification of coke oven flue gas denitration and coking chemical waste water;
5) close the first stop valve 6, stop passing into reducing agent, open the second stop valve 7 in connecting pipe 2 15 between reducing agent jetting device 3 and compressed air piping 2, start to pass into compressed air; When air flow direction becomes rising from decline in coke oven regenerator 5, close the second stop valve 7, stop passing into compressed air;
6) above process repeats, the switching action of action switching signal Synchronization Control first stop valve 6, second stop valve 7 exported by exchange transmission gear by control system.
For realizing a kind of system reducing the method for coke oven flue gas discharged nitrous oxides, comprise reducing agent to store and pre-mixing apparatus 1, reducing agent jetting device 3 and denitration reaction space 4, described denitration reaction space 4 is positioned at the region that coke oven regenerator 5 temperature is 870-970 DEG C, reducing agent jetting device 3 is arranged on top, denitration reaction space 4, its side outside coke oven stores with reducing agent and pre-mixing apparatus 1 is connected by connecting pipe 1, connecting pipe 1 is established the first stop valve 6; Reducing agent jetting device 3 is connected by connecting pipe 2 15 with compressed air piping 2 in addition, connecting pipe 2 15 is established the second stop valve 7.
Described reducing agent store and pre-mixing apparatus 1 by distilled ammonia wastewater storage device 11, remained ammonia storage device 12, for subsequent usely to form containing ammonia liquid storage device 13, reducing agent pre-mixing apparatus 10, distilled ammonia wastewater storage device 11, remained ammonia storage device 12, for subsequent usely connect reducing agent pre-mixing apparatus 10 respectively containing ammonia liquid storage device 13.
The side of described reducing agent jetting device 3 outside coke oven is also provided with diffusion valve 9 and pressure monitoring table 8.
Described first stop valve 6 and the second stop valve 7 connection control system respectively, control system connects the motion detection sensing device in coke furnace system on exchange transmission gear in addition.
Described control system is PLC or single-chip microcomputer.
Following examples are implemented under premised on technical solution of the present invention, give detailed embodiment and concrete operating process, but protection scope of the present invention are not limited to following embodiment.In following embodiment, method therefor is conventional method if no special instructions.
[embodiment]
As shown in Figure 1, be a kind of system architecture schematic diagram reducing coke oven flue gas discharged nitrous oxides that the present embodiment provides, comprising: reducing agent stores and pre-mixing apparatus 1, compressed air piping 2, reducing agent jetting device 3, denitration reaction space 4, coke oven regenerator 5; Wherein, denitration reaction space 4 is positioned at coke oven regenerator 5, residing temperature range is 870-970 DEG C, reducing agent jetting device 3 is placed in top, denitration reaction space 4, and reducing agent jetting device 3 outside stores with reducing agent respectively and pre-mixing apparatus 1 is connected by connecting pipe 1, be connected by connecting pipe 2 15 with compressed air piping 2, and connecting pipe 1 is provided with the first stop valve 6, connecting pipe 2 15 is provided with the second stop valve 7, is also provided with pressure monitoring instrument 8 and diffusion valve 9 in reducing agent jetting device outside.
In the present embodiment, reducing agent storage device 1 is by distilled ammonia wastewater storage device 11, remained ammonia storage device 12, for subsequent usely to form containing ammonia liquid storage device 13 and pre-mixing apparatus 10, according to on-the-spot coking chemical waste water situation, the distilled ammonia wastewater of storage in distilled ammonia wastewater storage device 11 and remained ammonia storage device 12 and remained ammonia is used to carry out premix, if any the situation of wastewater flow rate deficiency, can add for subsequent use containing the ammoniacal liquor allotment reducing agent for subsequent use in ammonia liquid storage device 13, reducing agent blending being incorporated in reducing agent jetting device 3 by connecting pipe 1 in pre-mixing apparatus 10.
In actual production process, the coke oven combustion waste gas produced after the indoor coal gas of coke oven combustion mixes with air enters coke oven regenerator 5, after coke oven regenerator 5 recovery section heat, collects in main chimney flue, be discharged in air eventually through chimney after entering bottom flue.And coke oven regenerator head temperature is 1200-1320 DEG C, double-edged fine-toothed comb brick head temperature is 300-400 DEG C, and for meeting the temperature conditions of denitration reaction of the present invention, denitration reaction space 4 need be placed in coke oven regenerator 5, the region of temperature range 870-970 DEG C.Reducing agent jetting device 3 is positioned over top, denitration reaction space 4, outside to store with reducing agent and pre-mixing apparatus 1 and compressed air piping 2 are connected.
In this enforcement, the reducing agent in reducing agent jetting device 3 is high-temperature high-pressure state, needs, at reducing agent jetting device 3 outer setting pressure monitoring instrument 8 and diffusion valve 9, to prevent the hidden danger that line clogging or other emergency situations are brought.
In actual production process, controlled the switch of the first stop valve 6 and the second stop valve 7 according to exchange transmission gear interlocking signal by control system, detailed process is: when in coke oven regenerator 5, air flow direction becomes decline from rising, open the first stop valve 6, reducing agent is passed into reducing agent jetting device 3; After reducing agent passes into a period of time, close the first stop valve 6, open the second stop valve 7, stop passing into reducing agent, start to pass into compressed air; When air flow direction becomes rising from decline in coke oven regenerator 5, close the second stop valve 7, stop passing into compressed air.
In the present embodiment, use coking chemical waste water and remained ammonia as reducing agent, wherein active component is ammonia, in reducing agent, ammonia density is 0.5-2%, the pipeline pressure of reducing agent jetting device 3 can be kept after reducing agent vaporization, when making reducing agent spray into denitration reaction space 4, there is certain initial velocity, ensure mixing uniformity, meanwhile, ammonia nitrogen is controlled than the escaping of ammonia can effectively avoiding ammonia and reaction of nitrogen oxides not exclusively to cause for 1.5-2.0; In addition, pass into the reducing agent that compressed-air actuated object is in emptying reducing agent jetting device 3, when preventing that in coke oven regenerator 5, air flow direction becomes rising, ammonia residual in reducing agent jetting device 3 enters combustion chamber with air-flow, produces nitrogen oxide.
In the present embodiment, denitration reaction space 4 is positioned at coke oven regenerator 5, and temperature range is the region of 870-970 DEG C, coke oven combustion flue gas steady residence time in denitration reaction space 4 remains on 0.5-2s, meanwhile, in denitration reaction space 4, flue-gas temperature can not go out to have aobvious decline.
The material selection 310S heat-resistance stainless steel of reducing agent jetting device 3, its structure can make reducing agent fully vaporize and spray in denitration reaction space 4, and reducing agent mixes with coke oven combustion waste gas with steam state form.Denitration reaction space 4 and reducing agent jetting device 3 with the use of, can guarantee that reducing agent fully mixes with coke oven combustion flue gas, and the reaction time sufficient both ensureing, ensure the denitration efficiency that coke oven combustion flue gas is higher.
Fig. 2 is denitration efficiency curve map in the present embodiment.It is better that the present embodiment only chooses one group of denitration effect, and representational data are described.Due in coke oven normal productive process, the factor such as flue-gas temperature, oxygen content can have influence on amount of nitrogen oxides, by data shown in the present embodiment, a kind of method and system reducing coke oven flue gas discharged nitrous oxides provided by the invention, denitration efficiency can be made to stablize and remain on 45-60%, in the coke oven flue gas of final discharge, nitrogen oxide emission meets the requirement of GB GB16171-2012 discharge standard.
Claims (6)
1. reduce a method for coke oven flue gas discharged nitrous oxides, it is characterized in that, comprise the steps:
1) coke oven stove peripheral hardware reducing agent stores and pre-mixing apparatus, establishes denitration reaction space and reducing agent jetting device in stove;
2) distilled ammonia wastewater in reducing agent storage and pre-mixing apparatus after blending and the mixed solution of remained ammonia make reducing agent, and its active component is ammonia, and containing ammonia density in reducing agent is 0.5 ~ 2%;
3) during coke oven work, the flue gas of the coal gas of ascending air and air and down current is commutated by exchange transmission gear timing, when exchange transmission gear changes exhaust gas disc open and-shut mode, air-flow in coke oven regenerator is to when becoming decline from rising, open reducing agent storage and the first stop valve between pre-mixing apparatus and reducing agent jetting device in connecting pipe one, liquid reducing agent is made to enter reducing agent jetting device, utilize the reducing agent in the heat water back of brick and flue gas in coke oven regenerator, reducing agent is fully vaporized;
4) be injected in denitration reaction space by reducing agent jetting device after the abundant preheating vaporization of reducing agent, it is the region of 870-970 DEG C that denitration reaction is spatially located at temperature in coke oven regenerator, the time of staying of reducing agent in denitration reaction space is 0.2 ~ 2s, and ammonia nitrogen ratio controls 1.5 ~ 2.0; Ammonia in reducing agent and the reaction of nitrogen oxides in flue gas, realize the purification of coke oven flue gas denitration and coking chemical waste water;
5) close the first stop valve, stop passing into reducing agent, open the second stop valve in connecting pipe two between reducing agent jetting device and compressed air piping, start to pass into compressed air; When air flow direction in coke oven regenerator becomes rising from decline, close the second stop valve, stop passing into compressed air;
6) above process repeats, action switching signal Synchronization Control first stop valve exported by exchange transmission gear by control system, the switching action of the second stop valve.
2. for realizing a kind of system reducing the method for coke oven flue gas discharged nitrous oxides according to claim 1, it is characterized in that, comprise reducing agent to store and pre-mixing apparatus, reducing agent jetting device and denitration reaction space, it is the region of 870-970 DEG C that described denitration reaction is spatially located at temperature in coke oven regenerator, reducing agent jetting device is arranged on denitration reaction top of space, its side outside coke oven stores with reducing agent and pre-mixing apparatus is connected by connecting pipe one, connecting pipe one is established the first stop valve; Reducing agent jetting device is connected by connecting pipe two with compressed air piping in addition, connecting pipe two is established the second stop valve.
3. a kind of system reducing coke oven flue gas discharged nitrous oxides according to claim 2, it is characterized in that, described reducing agent store and pre-mixing apparatus by distilled ammonia wastewater storage device, remained ammonia storage device, for subsequent usely to form containing ammonia liquid storage device, reducing agent pre-mixing apparatus, distilled ammonia wastewater storage device, remained ammonia storage device, for subsequent usely connect reducing agent pre-mixing apparatus respectively containing ammonia liquid storage device.
4. a kind of system reducing coke oven flue gas discharged nitrous oxides according to claim 2, is characterized in that, the side of described reducing agent jetting device outside coke oven is also provided with diffusion valve and pressure monitoring table.
5. a kind of system reducing coke oven flue gas discharged nitrous oxides according to claim 2, it is characterized in that, described first stop valve and the second stop valve connection control system respectively, control system connects the motion detection sensing device in coke furnace system on exchange transmission gear in addition.
6. a kind of system reducing coke oven flue gas discharged nitrous oxides according to claim 5, is characterized in that, described control system is PLC or single-chip microcomputer.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510633379.4A CN105169918A (en) | 2015-09-29 | 2015-09-29 | Method and system for reducing emission of nitrogen oxide in smoke of coking furnace |
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| CN201510633379.4A CN105169918A (en) | 2015-09-29 | 2015-09-29 | Method and system for reducing emission of nitrogen oxide in smoke of coking furnace |
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| CN201510633379.4A Pending CN105169918A (en) | 2015-09-29 | 2015-09-29 | Method and system for reducing emission of nitrogen oxide in smoke of coking furnace |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105664701A (en) * | 2016-04-13 | 2016-06-15 | 长沙紫宸科技开发有限公司 | Method for resourcefully using coking wastewater for preparing ammonia-hydrocarbon denitrifying agent |
| CN105797568A (en) * | 2016-05-18 | 2016-07-27 | 湖南省小尹无忌环境能源科技开发有限公司 | Method for preparing compound denitrification agent by means of waste organic solvents |
| CN108692319A (en) * | 2018-06-28 | 2018-10-23 | 北京建筑材料科学研究总院有限公司 | A kind of method and system waste liquid disposition and utilized |
| CN110026064A (en) * | 2019-03-26 | 2019-07-19 | 华泰永创(北京)科技股份有限公司 | The feedway and method of a kind of coke oven denitration in the stove also Primordial Qi |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105664701A (en) * | 2016-04-13 | 2016-06-15 | 长沙紫宸科技开发有限公司 | Method for resourcefully using coking wastewater for preparing ammonia-hydrocarbon denitrifying agent |
| CN105797568A (en) * | 2016-05-18 | 2016-07-27 | 湖南省小尹无忌环境能源科技开发有限公司 | Method for preparing compound denitrification agent by means of waste organic solvents |
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| CN110026064A (en) * | 2019-03-26 | 2019-07-19 | 华泰永创(北京)科技股份有限公司 | The feedway and method of a kind of coke oven denitration in the stove also Primordial Qi |
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Effective date of registration: 20160525 Address after: Dalian high tech Industrial Park, 116085 Liaoning province Qixianling high-energy Street No. 128 Applicant after: ACRE Coking and Refractory Engineering Consulting Corporation, MCC Applicant after: Guizhou Guizhou day Coking Co. Ltd. Address before: Dalian high tech Industrial Park, 116085 Liaoning province Qixianling high-energy Street No. 128 Applicant before: ACRE Coking and Refractory Engineering Consulting Corporation, MCC |
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Application publication date: 20151223 |
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| RJ01 | Rejection of invention patent application after publication |