CN221287428U - Partition ammonia spraying system - Google Patents
Partition ammonia spraying system Download PDFInfo
- Publication number
- CN221287428U CN221287428U CN202323402972.7U CN202323402972U CN221287428U CN 221287428 U CN221287428 U CN 221287428U CN 202323402972 U CN202323402972 U CN 202323402972U CN 221287428 U CN221287428 U CN 221287428U
- Authority
- CN
- China
- Prior art keywords
- urea
- zoned
- subregion
- solution spray
- injection
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 title claims abstract description 74
- 229910021529 ammonia Inorganic materials 0.000 title claims abstract description 36
- 238000005507 spraying Methods 0.000 title abstract description 28
- 238000005192 partition Methods 0.000 title abstract description 18
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims abstract description 129
- 239000004202 carbamide Substances 0.000 claims abstract description 129
- 239000007921 spray Substances 0.000 claims abstract description 41
- 238000009826 distribution Methods 0.000 claims abstract description 35
- 238000002347 injection Methods 0.000 claims description 30
- 239000007924 injection Substances 0.000 claims description 30
- 239000000243 solution Substances 0.000 claims description 27
- 238000012544 monitoring process Methods 0.000 claims description 22
- 238000003860 storage Methods 0.000 claims description 13
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 4
- 239000003546 flue gas Substances 0.000 claims description 4
- 239000000779 smoke Substances 0.000 abstract description 3
- 230000001105 regulatory effect Effects 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 4
- 238000000197 pyrolysis Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000001321 HNCO Methods 0.000 description 1
- OWIKHYCFFJSOEH-UHFFFAOYSA-N Isocyanic acid Chemical compound N=C=O OWIKHYCFFJSOEH-UHFFFAOYSA-N 0.000 description 1
- 238000000889 atomisation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000011343 solid material Substances 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
Abstract
The utility model discloses a partitioned ammonia spraying system which comprises a urea distribution system and a urea supply system, wherein the urea distribution system comprises a plurality of partitioned urea distribution modules, a flue before denitration is divided into a plurality of spraying partitions, one spraying partition corresponds to one partitioned urea distribution module, a plurality of urea solution spray guns are arranged in each spraying partition, an outlet of the urea supply system is communicated with an input end of each partitioned urea distribution module, an output end of each partitioned urea distribution module is communicated with an inlet of the urea solution spray gun in the corresponding spraying partition, a partitioned mixer is arranged in the flue before denitration, each urea solution spray gun and the partitioned mixer are distributed in sequence along the smoke flowing direction, the system can avoid nozzle blockage, the ammonia spraying uniformity is good, and the ammonia escape of the system is low.
Description
Technical Field
The utility model belongs to the technical field of flue gas denitration of thermal power plants, and relates to a zoned ammonia spraying system.
Background
Urea is a stable, non-toxic solid material and is an ideal source of denitration reducing agent. In recent years, urea is widely used as a denitration reducing agent in thermal power plants instead of liquid ammonia.
The direct urea injection pyrolysis is a technology for directly pyrolyzing an injected urea solution into NH 3 and HNCO by utilizing the heat of flue gas of an SCR inlet flue, can solve the problem of higher energy consumption of the traditional urea pyrolysis and urea hydrolysis ammonia production technology, simultaneously has no ammonia gas transportation outside the flue, achieves 'intrinsic safety', and has recently obtained wide attention of domestic and foreign scientific research units.
However, the number of the nozzles of the direct injection pyrolysis technology is far less than that of the conventional ammonia injection grids due to the influence of the minimum flow of the spray gun, engineering cost and other factors, and the nozzles are easy to block, so that the ammonia injection uniformity of the direct injection pyrolysis technology is poor, and the ammonia escape of the system is high.
Disclosure of utility model
The utility model aims to overcome the defects of the prior art and provide a zoned ammonia spraying system which can avoid nozzle blockage, has good ammonia spraying uniformity and has low ammonia escape.
In order to achieve the aim, the utility model discloses a partitioned ammonia spraying system which comprises a urea distribution system and a urea supply system, wherein the urea distribution system comprises a plurality of partitioned urea distribution modules, a flue before denitration is divided into a plurality of spraying partitions, one spraying partition corresponds to one partitioned urea distribution module, a plurality of urea solution spray guns are arranged in each spraying partition, an outlet of the urea supply system is communicated with an input end of each partitioned urea distribution module, an output end of each partitioned urea distribution module is communicated with an inlet of the corresponding urea solution spray gun in the spraying partition, a partitioned mixer is arranged in the flue before denitration, and each urea solution spray gun and the partitioned mixer are distributed in sequence along the smoke flow direction.
The partitioned urea distribution module comprises a manual ball valve and a pneumatic regulating valve, wherein the urea supply system is communicated with an inlet of a urea solution spray gun in the corresponding spraying partition sequentially through the manual ball valve and the pneumatic regulating valve.
The pneumatic regulating valve is communicated with the inlet of the urea solution spray gun in the corresponding spraying zone through the flowmeter.
The manual ball valve is communicated with the pneumatic regulating valve through the pneumatic switching valve.
A plurality of monitoring subareas are arranged in the flue after denitration, one of the monitoring subareas corresponds to one of the spraying subareas, and each monitoring subarea is internally provided with a NOx real-time monitoring system.
The system also comprises a controller, wherein the output end of each NOx real-time monitoring system is connected with the input end of the controller, and the output end of the controller is connected with the control end of the pneumatic regulating valve in each zone urea distribution module.
The urea supply system comprises a urea dissolving tank and a urea storage tank, wherein the urea dissolving tank is communicated with an inlet of the urea storage tank, and an outlet of the urea storage tank is communicated with an input end of each partition urea distribution module.
The urea dissolving tank is communicated with an inlet of the urea storage tank through a urea dissolving pump.
The outlet of the urea storage tank is communicated with the input end of each partitioned urea distribution module through a urea delivery pump.
All urea solution spray guns in the same spray zone are evenly distributed.
The utility model has the following beneficial effects:
When the zoned ammonia spraying system is specifically operated, zoned ammonia spraying and zoned control modes are adopted, all urea solution spray guns and the zoned mixers are sequentially distributed along the smoke flow direction, ammonia in the sprayed zones is uniformly mixed through the zoned mixers, the situation that partial ammonia is not available and the denitration efficiency of the system is affected due to blockage of individual urea solution spray guns can be effectively avoided, then the uniform distribution of the ammonia in the zones is ensured, and meanwhile, the urea spraying amount of each zone is effectively controlled to be matched with the required amount in real time, so that the denitration efficiency is ensured, and meanwhile, the ammonia escape of the system is effectively reduced.
Drawings
FIG. 1 is a block diagram of the present utility model;
fig. 2 is a block diagram of the urea distribution system 2 of the present utility model.
The system comprises a urea supply system 1, a urea distribution system 2, a urea injection system 3, a zoned mixer 4, a NOx real-time monitoring system 5, a manual ball valve 21, a pneumatic switch valve 22, a pneumatic regulating valve 23 and a flowmeter 24.
Detailed Description
In order to make the present utility model better understood by those skilled in the art, the following description will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the accompanying drawings, and it is apparent that the described embodiments are only some embodiments of the present utility model, not all embodiments, but not intended to limit the scope of the present disclosure. In addition, in the following description, descriptions of well-known structures and techniques are omitted so as not to unnecessarily obscure the concepts of the present disclosure. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present utility model without making any inventive effort, shall fall within the scope of the present utility model.
In the accompanying drawings, there is shown a schematic structural diagram in accordance with a disclosed embodiment of the utility model. The figures are not drawn to scale, wherein certain details are exaggerated for clarity of presentation and may have been omitted. The shapes of the various regions, layers and their relative sizes, positional relationships shown in the drawings are merely exemplary, may in practice deviate due to manufacturing tolerances or technical limitations, and one skilled in the art may additionally design regions/layers having different shapes, sizes, relative positions as actually required.
Referring to fig. 1 and 2, the zoned ammonia injection system of the present utility model includes a urea distribution system 2, a urea supply system 1 and a urea injection system 3;
The urea distribution system 2 comprises a plurality of subarea urea distribution modules, the flue before denitration is divided into a plurality of spray subareas, one spray subarea corresponds to one subarea urea distribution module, a plurality of urea solution spray guns are arranged in each spray subarea, the outlet of the urea supply system 1 is communicated with the input end of each subarea urea distribution module, the output end of each subarea urea distribution module is communicated with the inlet of the corresponding urea solution spray gun in the spray subarea, and all urea solution spray guns form the urea spray system 3.
In this embodiment, still be provided with subregion blender 4 in the flue before the denitration, each urea solution spray gun with subregion blender 4 distributes in proper order along the flue gas circulation direction, will spray the ammonia misce bene in the subregion through subregion blender 4, can effectively avoid simultaneously that individual urea solution spray gun to block up and cause the part to have no ammonia, influence the condition emergence of system denitration efficiency.
In this embodiment, the partition urea distribution module includes a manual ball valve 21, a pneumatic switch valve 22, a pneumatic control valve 23 and a flow meter 24, where the urea supply system 1 is sequentially connected to the inlets of the urea solution spray guns in the corresponding injection partition via the manual ball valve 21, the pneumatic switch valve 22, the pneumatic control valve 23 and the flow meter 24, the manual ball valve 21 is used to cut off the urea supply system 1, the pneumatic switch valve 22 is used to cut off the urea supply system 1 quickly, the pneumatic control valve 23 is used to control the urea injection quantity of the injection partition in real time, and the flow meter 24 is used to monitor the urea injection quantity of the injection partition in real time.
In this embodiment, a plurality of monitoring zones are disposed in the flue after denitration, one of the monitoring zones corresponds to one spraying zone, each monitoring zone is internally provided with a NOx real-time monitoring system 5, the output end of each NOx real-time monitoring system 5 is connected with the input end of the controller and the output end of the flowmeter 24, the output end of the controller is connected with the pneumatic switch valve 22 and the control end of the pneumatic control valve 23 in each zone urea distribution module, the controller detects the concentration of NOx in each monitoring zone through the NOx real-time monitoring system 5 in each monitoring zone, and controls the corresponding pneumatic control valve 23 to adjust the urea spraying quantity of the corresponding spraying zone, so that the urea spraying quantity in the spraying zone is matched with the required quantity in real time, and the ammonia escape of the system is effectively reduced while the denitration efficiency is ensured.
In this embodiment, the urea supply system 1 includes a urea dissolving tank, a urea dissolving pump, a urea storage tank, and a urea delivery pump, where the urea dissolving tank is connected to an inlet of the urea storage tank via the urea dissolving pump, and an outlet of the urea storage tank is connected to an input end of each partition urea distribution module via the urea delivery pump.
In this embodiment, all urea solution spray guns in the same spraying partition are evenly distributed, and the better the atomization effect, the more even the urea solution entering the flue is, so as to reduce the ammonia escape of the system.
The working process of the utility model is as follows:
The urea solution output by the urea supply system 1 is sent into urea solution spray guns in all spray zones through all zone urea distribution modules, and then is sprayed into all spray zones through the urea solution spray guns in all spray zones, the controller detects the concentration of NOx in all monitoring zones through a NOx real-time monitoring system 5 in all monitoring zones, and controls a corresponding pneumatic regulating valve 23 to regulate the urea spray quantity of the corresponding spray zone so as to enable the urea spray quantity in the spray zone to be matched with the demand quantity in real time, and the ammonia escape of the system is effectively reduced while the denitration efficiency is ensured.
Finally, it should be noted that: the above embodiments are only for illustrating the technical aspects of the present utility model and not for limiting the same, and although the present utility model has been described in detail with reference to the above embodiments, it should be understood by those of ordinary skill in the art that: modifications and equivalents may be made to the specific embodiments of the utility model without departing from the spirit and scope of the utility model, which is intended to be covered by the claims.
Claims (10)
1. The utility model provides a subregion spouts ammonia system, its characterized in that includes urea distribution system (2) and urea feed system (1), urea distribution system (2) include a plurality of subregions urea distribution module, flue before the denitration divide into a plurality of injection subregions, wherein, an injection subregion corresponds a subregion urea distribution module, wherein, all is provided with a plurality of urea solution spray guns in each injection subregion, the export of urea feed system (1) is linked together with the input of each subregion urea distribution module, the output of each subregion urea distribution module is linked together with the entry that corresponds the urea solution spray gun in the injection subregion, be provided with subregion blender (4) in the flue before the denitration, each urea solution spray gun and subregion blender (4) distribute in proper order along flue gas circulation direction.
2. The zoned ammonia injection system according to claim 1, wherein the zoned urea distribution module comprises a manual ball valve (21) and a pneumatic control valve (23), wherein the urea supply system (1) is communicated with the inlet of the urea solution spray gun in the corresponding injection zone sequentially through the manual ball valve (21) and the pneumatic control valve (23).
3. The zoned ammonia injection system of claim 2 wherein the pneumatic control valve (23) is in communication with the inlet of the urea solution spray gun in the corresponding injection zone via a flowmeter (24).
4. The zoned ammonia injection system of claim 2 wherein the manual ball valve (21) is in communication with the pneumatic regulator valve (23) via a pneumatic on-off valve (22).
5. The zoned ammonia injection system according to claim 2, characterized in that a plurality of monitoring zones are arranged in the flue after denitration, one of the monitoring zones corresponds to one injection zone, and a NOx real-time monitoring system (5) is arranged in each monitoring zone.
6. The zoned ammonia injection system of claim 5 further comprising a controller, wherein the output of each NOx real-time monitoring system (5) is connected to the input of the controller, and wherein the output of the controller is connected to the control of a pneumatic control valve (23) in each zoned urea dispensing module.
7. The zoned ammonia injection system according to claim 1, wherein the urea supply system (1) comprises a urea dissolving tank and a urea storage tank, wherein the urea dissolving tank is in communication with an inlet of the urea storage tank and an outlet of the urea storage tank is in communication with an input of each zoned urea dispensing module.
8. The zoned ammonia injection system of claim 7 wherein the urea dissolving tank is in communication with the inlet of the urea storage tank via a urea dissolving pump.
9. The zoned ammonia injection system of claim 7 wherein the outlet of the urea storage tank is in communication with the input of each zoned urea dispensing module via a urea transfer pump.
10. The zoned ammonia injection system of claim 1 wherein all urea solution spray guns within the same injection zone are evenly distributed.
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN221287428U true CN221287428U (en) | 2024-07-09 |
Family
ID=
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| WO2021184786A1 (en) | Urea direct-injection pyrolysis denitrification device arranged inside outlet flue duct of gas turbine | |
| CN205216566U (en) | SNCR (Selective non catalytic reduction) denitration device | |
| CN113426296A (en) | Energy-saving urea hydrolysis ammonia preparation denitrification facility based on combustion engine SCR denitration | |
| CN101863495A (en) | Equipment for efficiently preparing ammonia water from liquid ammonia and water | |
| CN202921159U (en) | Double-atomization spray gun for SNCR (selective non-catalytic reduction) denitration system | |
| CN221287428U (en) | Partition ammonia spraying system | |
| CN111214954A (en) | Urea denitration system and method based on gas-steam combined cycle unit | |
| CN112774436A (en) | Device and method for preparing SCR denitration reducing agent with flue gas heating system | |
| CN209476010U (en) | A kind of urea denitrating system based on Combined cycle gas-steam turbine unit | |
| CN117654267A (en) | Partition ammonia spraying system based on urea direct-injection pyrolysis | |
| CN110526869B (en) | Continuous production system of 4-aminoantipyrine | |
| CN113877420A (en) | Ammonium bicarbonate direct injection denitration reduction system and method | |
| CN213492988U (en) | Ammonia water vaporization ammonia preparation device | |
| CN216395900U (en) | Energy-saving urea hydrolysis ammonia preparation denitrification facility based on combustion engine SCR denitration | |
| CN114345233B (en) | Spray granulation device and atomization method suitable for high-concentration calcium chloride solution | |
| CN214681040U (en) | Flue gas denitration device for asphalt mixing plant | |
| CN112717692B (en) | Flue gas denitration process for asphalt mixing plant | |
| CN214809860U (en) | Device for evaporation pyrolysis | |
| CN216964155U (en) | Chain boiler urea directly spouts denitrification facility | |
| CN215506692U (en) | Urea pyrolysis flue direct injection device | |
| CN111249906A (en) | Metering distribution system and method for urea direct injection pyrolysis process | |
| CN208839375U (en) | A kind of SCR denitration urea pyrolysis furnace set technique device | |
| CN208372832U (en) | A kind of reducing agent supply system for SCR denitration | |
| CN207634148U (en) | A kind of SCR urea injection protection system | |
| CN108264060B (en) | Energy-saving ammonia water distillation ammonia production device special for denitration |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant |