CN104495872B - The treatment process of urea gun inlets variable valve blocking in a kind of ammonia preparation system from urea - Google Patents
The treatment process of urea gun inlets variable valve blocking in a kind of ammonia preparation system from urea Download PDFInfo
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- CN104495872B CN104495872B CN201410796529.9A CN201410796529A CN104495872B CN 104495872 B CN104495872 B CN 104495872B CN 201410796529 A CN201410796529 A CN 201410796529A CN 104495872 B CN104495872 B CN 104495872B
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Abstract
The present invention discloses the treatment process of urea gun inlets variable valve blocking in a kind of ammonia preparation system from urea, according under meter displayed value and experience comprehensive descision, it is determined that the urea soln flow that urea soln variable valve passes through is low, has latch up phenomenon; Take off flow of urea adjustable valve (2), rinse the spool of flow of urea adjustable valve (2) with the water of 80��100 DEG C; A pneumatic hose is installed between pressurized air inlet tube (6) and flow of urea adjustable valve inlet tube (7), starts pressurized air inlet valve (4), blow with the pressurized air of 0.2��0.6MPa and sweep; Regulate the position of pneumatic hose one end interface to move to flow of urea adjustable valve outlet pipe (8) by flow of urea adjustable valve inlet tube (7), and clean according to the operation steps of previous step; Again repeat the operation of the 2nd step. The present invention can solve the problem of crystallization urea blocking pipe and valve simply efficiently, it is to increase the efficiency of denitrating flue gas, and practicality is stronger.
Description
Technical field
The invention belongs to urea technique for production of ammonia Application Areas, the treatment process of the blocking that is specifically related in a kind of ammonia preparation system from urea urea gun inlets variable valve.
Background technology
The country of China's to be one taking coal be main energy sources, coal accounts for 75% in primary energy source, wherein more than 84% is utilized by combustion method. Coal combustion is discharged the oxynitride in waste gas (NOx), is one of main source of pollution causing topsoil, and the harm of the environmental problem that oxynitride (NOx) causes and HUMAN HEALTH is extremely serious. According to China Environmental State Bulletin display, the quantity discharged of oxynitride (NOx) will continue the trend in steady-state growth. If do not taken measures, before and after the year two thousand twenty, China will exceed the U.S. becomes the big NOx emission state of the first in the world, and the immense pressure that solution environment protection faces has been very urgent.
Along with the progress of domestic socioeconomic development, science and technology, the improvement day by day of people's standard of living, the attention of environment is reached unprecedented height by society. Equipment for denitrifying flue gas becomes the indispensable integral part of power plant construction after desulfurizer, and SCR gas denitrifying technology is current denitration efficiency height, most widely used general, the most ripe denitration mainstream technology of domestic and international power plant. At present, in selective-catalytic-reduction denitrified (SCR) technique, most reductive agent adopts urea legal system ammonia system, Wyler's process first dissolves in the de-mineralized water of urea solid particle in container completely, then after urea soln qualified for Pressure, Concentration, Temperature being transported to hold-up vessel, it is transported to urea solution metering module again by high flow capacity recycle pump, entered after carrying out reaction generation ammonia in urea spray gun to pyrolysis oven again by regulated valve, ammonia enters the reaction of nitrogen oxides in flue and flue gas, generate nitrogen and water, reduce the nitrous oxides concentration in flue gas.
Urea soln crystallization very easily at low temperatures in this technique, causes pipeline and valve blockage, causes denitrating system abnormal, and discharged nitrous oxides exceeds standard after stain atmospheric environment, jeopardizes HUMAN HEALTH.
Summary of the invention
For the regulated valve latch up phenomenon in selective-catalytic-reduction denitrified (SCR) flue-gas denitration process, the present invention provides a kind of method processing blocking, with the simple problem solving crystallization urea blocking pipe and valve efficiently, it is to increase the efficiency of denitrating flue gas.
Realize the object of the invention technical solution step as follows:
Step 1, according under meter displayed value and experience comprehensive descision, it is determined that the urea soln flow that urea soln variable valve passes through is low, has latch up phenomenon;
Step 2, closedown urea soln stopping valve, urea gun inlets manual valve, pressurized air inlet valve, take off flow of urea adjustable valve, and manually opened, rinses the spool of flow of urea adjustable valve with the water of 80��100 DEG C;
Step 3, a pneumatic hose is installed between the pressurized air inlet tube and flow of urea adjustable valve inlet tube of urea spray gun, opens pressurized air inlet valve, keep after pressure 0.2��0.6Mpa certain time, closes compression air inlet valve;
The position of step 4, adjustment pneumatic hose interface, wherein to be connected on the pressurized air inlet tube of urea spray gun constant for an end, the other end changes receives flow of urea adjustable valve outlet pipe, open pressurized air inlet valve, after keeping pressure 0.2��0.6MPa certain time, closes compression air inlet valve;
After step 5, repeating step 3 and step 4 several, manual switch several flow of urea adjustable valves, rinse the spool of flow of urea adjustable valve again with the water of 80��100 DEG C.
Described step 2 and step 5 are rinsed with water the spool of flow of urea adjustable valve, is all no less than 5L by volume of water.
The pressurized air inlet valve opening time of described step 3 and step 4 is all no less than 1min.
Aforesaid method can solve the problem of crystallization urea blocking pipe and valve simply efficiently, it is to increase the efficiency of denitrating flue gas, and practicality is stronger.
Accompanying drawing explanation
Accompanying drawing is the setting drawing at urea gun inlets place.
Description of reference numerals
1 urea soln stopping valve 2 flow of urea adjustable valve
3 urea gun inlets manual valve 4 pressurized air inlet valves
5 urea spray gun 6 pressurized air inlet tubes
7 flow of urea adjustable valve inlet tube 8 flow of urea adjustable valve outlet pipes
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail. Should be understood that, embodiment described herein, only for instruction and explanation of the present invention, is not limited to the present invention.
The side of urea spray gun 5 is connected by pipeline and is provided with urea gun inlets manual valve 3, flow of urea adjustable valve 2, urea soln stopping valve 1 successively, is provided with pressurized air inlet valve 4 between urea gun inlets manual valve 3 and urea spray gun 5. First urea soln arrives flow of urea adjustable valve inlet tube 7 by urea soln stopping valve 1, then arrives flow of urea adjustable valve outlet pipe 8 by flow of urea adjustable valve 2, then enters urea spray gun 5 by urea gun inlets manual valve 3.
The present invention provides the treatment process of urea gun inlets variable valve blocking in a kind of ammonia preparation system from urea, realizes according to following step:
Step 1, according under meter displayed value and experience comprehensive descision, it is determined that the urea soln flow that urea soln variable valve passes through is low, has latch up phenomenon;
Step 2, closedown urea soln stopping valve 1, urea gun inlets manual valve 3, pressurized air inlet valve 4, take off flow of urea adjustable valve 2, and manually opened, and with 5L, the water of 80��100 DEG C rinses the spool of flow of urea adjustable valve 2;
Step 3, between the pressurized air inlet tube 6 and flow of urea adjustable valve inlet tube 7 of urea spray gun 5 install an internal diameter be the pneumatic hose of 7mm, open pressurized air inlet valve 4, keep pressure 0.6MPa, after continuing 1min, closes compression air inlet valve 4;
Step 4, regulating the position of pneumatic hose interface, wherein to be connected on the pressurized air inlet tube 6 of urea spray gun 5 constant for an end, and the other end changes receives flow of urea adjustable valve outlet pipe 8. Open pressurized air inlet valve 4, keep pressure 0.6MPa, after continuing 1min, closes compression air inlet valve 4;
After step 5, repeating step 3 and step 4 several, manual switch several flow of urea adjustable valves 2, again with 5L, the water of 80��100 DEG C rinses the spool of flow of urea adjustable valve 2.
In other implementations, being taken off by flow of urea adjustable valve 2, after disintegration, it is possible to take out urea crystals, eliminate latch up phenomenon, the mode of texturing for this type of also should drop in protection scope of the present invention.
To sum up, the present invention can solve the problem of crystallization urea blocking pipe and valve simply efficiently, it is to increase the efficiency of denitrating flue gas, and practicality is stronger.
Below the preferred embodiment of the present invention is described by reference to the accompanying drawings in detail; but; the detail that the present invention is not limited in above-mentioned enforcement mode; within the scope of the technical conceive of the present invention; the technical scheme of the present invention can being carried out multiple simple variant, these simple variant all belong to protection scope of the present invention.
Claims (3)
1. the treatment process of urea gun inlets variable valve blocking in an ammonia preparation system from urea, it is characterised in that, specifically comprise the following steps:
Step 1, according under meter displayed value and experience comprehensive descision, it is determined that the urea soln flow that urea soln variable valve passes through is low, has latch up phenomenon;
Step 2, closedown urea soln stopping valve (1), urea gun inlets manual valve (3), pressurized air inlet valve (4), take off flow of urea adjustable valve (2), and manually opened, the spool of flow of urea adjustable valve (2) is rinsed with the water of 80��100 DEG C;
Step 3, between the pressurized air inlet tube (6) and flow of urea adjustable valve inlet tube (7) of urea spray gun (5) install a pneumatic hose, open pressurized air inlet valve (4), after keeping pressure 0.2��0.6MPa certain time, closes compression air inlet valve (4);
The position of step 4, adjustment pneumatic hose interface, wherein to be connected on the pressurized air inlet tube (6) of urea spray gun (5) constant for an end, the other end changes receives flow of urea adjustable valve outlet pipe (8), open pressurized air inlet valve (4), after keeping pressure 0.2��0.6MPa certain time, closes compression air inlet valve (4);
After step 5, repeating step 3 and step 4 several, manual switch several flow of urea adjustable valves (2), rinse the spool of flow of urea adjustable valve (2) again with the water of 80��100 DEG C.
2. the treatment process of urea gun inlets variable valve blocking in ammonia preparation system from urea according to claim 1, it is characterised in that, described step 2 and step 5 are rinsed with water the spool of flow of urea adjustable valve (2), is all no less than 5L by volume of water.
3. the treatment process of urea gun inlets variable valve blocking in ammonia preparation system from urea according to claim 1, it is characterised in that, pressurized air inlet valve (4) opening time of described step 3 and step 4 is all no less than 1min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410796529.9A CN104495872B (en) | 2014-12-19 | 2014-12-19 | The treatment process of urea gun inlets variable valve blocking in a kind of ammonia preparation system from urea |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410796529.9A CN104495872B (en) | 2014-12-19 | 2014-12-19 | The treatment process of urea gun inlets variable valve blocking in a kind of ammonia preparation system from urea |
Publications (2)
| Publication Number | Publication Date |
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| CN104495872A CN104495872A (en) | 2015-04-08 |
| CN104495872B true CN104495872B (en) | 2016-06-01 |
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| CN201410796529.9A Expired - Fee Related CN104495872B (en) | 2014-12-19 | 2014-12-19 | The treatment process of urea gun inlets variable valve blocking in a kind of ammonia preparation system from urea |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112933960B (en) * | 2021-03-13 | 2023-02-03 | 中国大唐集团科学技术研究院有限公司华中电力试验研究院 | Anti-blocking type SCR denitration system spouts manual valve of ammonia branch pipe |
| CN113083013B (en) * | 2021-03-15 | 2023-06-30 | 苏州西热节能环保技术有限公司 | Ammonia injection grid anti-blocking method and system suitable for urea ammonia production process |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102009025226A1 (en) * | 2009-06-09 | 2010-12-16 | Elringklinger Ag | System for injecting urea solution on exhaust line of internal combustion engine, has reservoir for urea, and has nozzle that is injected in exhaust line |
| KR101074050B1 (en) * | 2010-01-20 | 2011-10-17 | 한국전력기술 주식회사 | An exhaust gas denitriging system to prevent clopping nozzle and ureawater pipe and Ureawater supply device to prevent ureawater solidification |
| KR101238777B1 (en) * | 2010-06-21 | 2013-03-04 | 주식회사 파나시아 | Reducing agent supply device and exhaust gas denitriging system usig the same |
| KR101294067B1 (en) * | 2011-08-30 | 2013-08-07 | 현대자동차주식회사 | Method fof preventing choking of urea injection nozzle on scr system |
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