CN106310910A - Mixing distribution device for power station boiler SNCR denitration system - Google Patents
Mixing distribution device for power station boiler SNCR denitration system Download PDFInfo
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- CN106310910A CN106310910A CN201610984777.5A CN201610984777A CN106310910A CN 106310910 A CN106310910 A CN 106310910A CN 201610984777 A CN201610984777 A CN 201610984777A CN 106310910 A CN106310910 A CN 106310910A
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- spray gun
- reducing agent
- station boiler
- control unit
- compressed air
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/77—Liquid phase processes
- B01D53/79—Injecting reactants
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/54—Nitrogen compounds
- B01D53/56—Nitrogen oxides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/20—Reductants
- B01D2251/206—Ammonium compounds
- B01D2251/2062—Ammonia
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Treating Waste Gases (AREA)
- Chimneys And Flues (AREA)
Abstract
The invention belongs to the technical field of a boiler denitration device and especially relates to a mixing distribution device for a power station boiler SNCR denitration system. The invention mainly aims to solve the problems of low denitration rate, high ammonia escape volume and low boiler heat efficiency of the present SNCR denitration system. The mixing distribution device for the power station boiler SNCR denitration system provided by the invention comprises a power station boiler, an SNCR denitration system connected with the power station boiler, a plurality of spray gun reducing agent control units and a plurality of compressed air control units, wherein each spray gun reducing agent control unit is matched with each compressed air control unit so as to form one set and each spray gun reducing agent control unit comprises a reducing agent solution, softened water, a plurality of solenoid valves, a plurality of adjusting valves, a plurality of flow meters, a buffering mixer and a plurality of spray guns.
Description
Technical field
The invention belongs to Denitration in Boiler device technique field, particularly relate to a kind of for station boiler SNCR denitration system
Mixed allocation device.
Background technology
Require increasingly strict for station boiler minimum discharge, NOx requires that concentration is less than 50mg/Nm3.Smokeless for using
The W flame boiler of coal, because of its ature of coal and special combustion system, causes NOx to generate concentration and is higher than general coal-powder boiler, up to
1300mg/Nm3.According to the efficiency of conventional scr denitration technology up to 80～90%, then NOx emission concentration can minimum be down to
130mg/Nm3, it is clear that from desired value gap very away from.It addition, high denitration rate SCR device is designed with multi-layer catalyst layer, Shi Biyin
Playing flue gas resistance to increase, air-introduced machine is exerted oneself increases, the increase of air preheater air leakage rate；The highest denitration rate SCR device needs to spray into greatly
Amount reducing agent, can make amount of ammonia slip increase, cause air preheater heat exchange element to block；Boiler thermal output is finally caused to reduce.
SNCR technology does not use catalyst in 900-1250 DEG C of temperature range of burner hearth, utilizes reducing agent to carry out denitration, therefore
SNCR with SCR is combined, can effectively reduce the NOx concentration of SCR inlet, reduce SCR denitration pressure, reduce SCR catalysis
Oxidant layer and the usage amount of catalyst, the unreacted reducing agent of SNCR part in burner hearth, arrive SCR catalyst through long-distance
Time, it is sufficiently mixed with flue gas, the NOx reduction reaction of SCR part can be made efficiently to carry out, effectively reduce the escaping of ammonia and generate hydrogen sulfate
The air preheater blocking that ammonium causes.But this combined denitration mode does not improve denitration efficiency.Its reason be traditional SNCR efficiency relatively
Low, on-the-spot operation shows usually 20%-30%.The inefficient main cause of SNCR includes: SNCR reaction often cannot ensure
Carry out in optimal temperature range, or reduzate mixes with flue gas uneven.In the face of such present situation, it is necessary to increase efficient
SNCR denitration system, in order to reduce the denitration pressure of SCR, reaches the requirement less than 50mg/Nm3 of the NOx emission concentration, effectively reduces
SCR catalyst layer and consumption, effectively reduce the escaping of ammonia, ensure boiler thermal output simultaneously, it is ensured that air preheater equipment safety.
Summary of the invention
Present invention is generally directed to existing SNCR denitration system, to there is denitration rate low, and amount of ammonia slip is big and boiler thermal output is low
Problem, it is provided that a kind of mixed allocation device for station boiler SNCR denitration system.
The present invention solves the problems referred to above and the technical scheme taked is:
A kind of mixed allocation device for station boiler SNCR denitration system, including station boiler and with station boiler phase
The SNCR denitration system connected, the most also includes multiple spray gun group reducing agent control units and multiple compressed air control unit,
Each spray gun group reducing agent control unit mates composition one group with a compressed air control unit, and described each spray gun group is reduced
Agent control unit is all to be mixed by reductant solution, softening water, multiple electromagnetic valve, multiple regulation valve, multiple effusion meter, a buffering
Clutch and multiple spray gun composition, reductant solution is connected, at reducing agent by the entrance of reducing agent pipeline with buffering blender
Be sequentially provided with electromagnetic valve, regulation valve and effusion meter on pipeline, soften water by soften waterpipe also with the entrance of buffering blender
Being connected, be also sequentially provided with electromagnetic valve, regulation valve and effusion meter softening on waterpipe, the outlet of buffering blender is passed through respectively
Multiple lance pipe are connected with multiple spray guns, the corresponding spray gun of each lance pipe, on each lance pipe successively
Being provided with effusion meter and electromagnetic valve, multiple spray guns are separately mounted to front wall and the Hou Qiang of station boiler；
Described each compressed air control system is by compressed air, multiple electromagnetic valve, regulation valve and piezometer group
Becoming, compressed air connects multiple air secondary duct by gas main duct, and each air secondary duct connects a spray gun, at air
It is sequentially provided with electromagnetic valve, regulation valve and piezometer on main pipeline, each air secondary duct is designed with an electromagnetic valve；
Denitration control centre in described SNCR denitration system believes in real time according to unit load, station boiler fluid field in furnace
Breath, temperature field in furnace real time information, NOx concentration real time information and the escaping of ammonia real time information, in SNCR denitration system control
Heart optimization distributes to one real-time control command of each spray gun group, after spray gun group receives real-time control command, spray gun after calculating
Set control system sends through calculating the regulation valve in this spray gun group reducing agent control unit backward and compressed air control unit
Instruct to control flow, concentration and the expulsion pressure of each spray gun group reducing agent.
The present invention uses technique scheme, denitration control centre to be responsible for according to unit load change, fluid field in furnace
The change of information, temperature field in furnace information, NOx concentration index, the escaping of ammonia index etc. calculate real-time reducing agent straying quatity, and by it
It is reasonably allocated to the spray gun group that appropriate location is installed, completes to spray into task；Each spray gun group all configures a set of spray gun group and controls system
System, is responsible for, according to the flow field change in this spray gun group injection institute overlay area and variations in temperature, reductant solution being adjusted flexibly dense
Degree size and lance outlet pressure value.
The present invention is according to station boiler structure and dischargeable capacity, with load and pot in-furnace temperature and the situation of change in flow field,
The parameters such as the maximum of smoke NOx content, the quantity of reasonable disposition spray gun, the layout area of spray gun group, arrange the number of plies and relatively
Position, a spray gun group can be propped up reducing agent spray gun as required and be constituted by 3-4, is equipped with according to the reasonable quantity of spray gun group, right
For W flame stove, the position of spray gun group is generally on front wall and rear wall, and is positioned at the reasonable region of upper furnace.
During use reductant concentration be the concentration according to each spray gun set control system requirement and flow by reducing agent with soft
Change water mixing, mixed reductant concentration and uninterrupted to be controlled by regulation valve, realized all by buffering blender
Even mixing, then reasonable distribution is to the gun inlets devoted oneself to work of needs, and the effusion meter that pipeline is installed is respectively intended to monitor soft
Changing water, reducing agent and mixed reducing agent flow number, the effusion meter of each lance pipe is respectively intended to monitoring and is assigned to phase
Answer the uninterrupted in reducing agent gun inlets pipeline.
Air pressure distribution portion realizes reducing agent atomization and use compressed-air actuated Stress control, and is distributed and deliver to reducing agent and spray
Rifle entrance, in order to reducing agent is atomized.The piezometer installed on pipeline is used for monitoring compressed-air actuated pressure, by regulation
Valve realizes the adjustment to compressed air pressure size.When selecting the work of certain spray gun group, the electromagnetic valve in corresponding pipeline will be complete
Portion opens.
Accompanying drawing explanation
Fig. 1 is the structural representation of the present invention.
Detailed description of the invention
Embodiment 1
As it is shown in figure 1, a kind of mixed allocation device for station boiler SNCR denitration system, including station boiler 1 He
The SNCR denitration system being connected with station boiler, wherein: also include multiple spray gun group reducing agent control systems and multiple compression
Air control system for air, each spray gun group reducing agent control system mates composition one group, often group with a compressed air control system
Numbered 1#, 2# n#, as a example by 1#, 1# spray gun group reducing agent control system is by reductant solution 2, softening water
3, multiple electromagnetic valves 4, multiple regulation valve 5,6, buffering blender 7 of multiple effusion meter and multiple spray gun 8 form, and reducing agent is molten
Liquid 2 is connected by the entrance of reducing agent pipeline 9 with buffering blender 7, is sequentially provided with electromagnetic valve 4, adjusts on reducing agent pipeline 9
Joint valve 5 and effusion meter 6, soften water 3 and be connected by softening the waterpipe 10 entrance also with buffering blender 7, softening water pipe
Also being sequentially provided with electromagnetic valve 4, regulation valve 5 and effusion meter 6 on road 10, the outlet of buffering blender 7 is respectively by multiple lance tubes
Road 11 is connected with multiple spray guns 8, the corresponding spray gun of each lance pipe 11, is sequentially provided with on each lance pipe 11
Effusion meter 6 and electromagnetic valve 4, multiple spray guns 8 are separately mounted to front wall and the Hou Qiang of station boiler 1；
1# compressed air control system is made up of compressed air 12, multiple electromagnetic valve 4, regulation valve 5 and piezometer 13, compression
Air 12 connects multiple air secondary duct 15 by gas main duct 14, and each air secondary duct 15 connects a spray gun 8, at sky
It is sequentially provided with electromagnetic valve 4, regulation valve 5 and piezometer 13 on gas main pipeline 14, each air secondary duct 15 is designed with one
Electromagnetic valve 4；
Denitration control centre 16 in described SNCR denitration system believes in real time according to unit load, station boiler fluid field in furnace
Breath, temperature field in furnace real time information, NOx concentration real time information and the escaping of ammonia real time information, after SNCR denitration system calculates
Regulation valve 5 in 1# spray gun group reducing agent control system and 1# compressed air control system sends instruction to control each spray gun
Set control system and the injection of each compressed air control system.
Claims (1)
1. for a mixed allocation device for station boiler SNCR denitration system, including station boiler (1) and and station boiler
The SNCR denitration system being connected, is characterized in that also including that multiple spray gun group reducing agent control units and multiple compressed air control
Unit, each spray gun group reducing agent control unit mates composition one group, described each spray gun with a compressed air control unit
Group reducing agent control unit is all by reductant solution (2), softens water (3), multiple electromagnetic valve (4), multiple regulation valve (5), many
Individual effusion meter (6), a buffering blender (7) and multiple spray gun (8) composition, reductant solution (2) passes through reducing agent pipeline (9)
It is connected with the entrance of buffering blender (7), reducing agent pipeline (9) is sequentially provided with electromagnetic valve (4), regulation valve (5) and stream
Gauge (6), softens water (3) and is connected by softening the waterpipe (10) entrance also with buffering blender (7), is softening waterpipe
(10) being also sequentially provided with electromagnetic valve (4), regulation valve (5) and effusion meter (6) on, the outlet of buffering blender (7) is respectively by many
Individual lance pipe (11) is connected with multiple spray guns (8), and the corresponding spray gun of each lance pipe (11), at each lance pipe
(11) be all sequentially provided with effusion meter (6) and electromagnetic valve (4) on, multiple spray guns (8) be separately mounted to station boiler (1) front wall and
Rear wall；
Described each compressed air control system is by compressed air (12), multiple electromagnetic valve (4), regulation valve (5) and pressure
Power meter (13) forms, and compressed air (12) connects multiple air secondary duct (15) by gas main duct (14), and each air is secondary
Pipeline (15) connects a spray gun (8), is sequentially provided with electromagnetic valve (4), regulation valve (5) and piezometer in gas main duct (14)
(13), each air secondary duct (15) is designed with an electromagnetic valve (4)；
Denitration control centre (16) in described SNCR denitration system believes in real time according to unit load, station boiler fluid field in furnace
Breath, temperature field in furnace real time information, NOx concentration real time information and the escaping of ammonia real time information, in SNCR denitration system control
Heart optimization distributes to one real-time control command of each spray gun group, after spray gun group receives real-time control command, spray gun after calculating
Set control system is sent out through calculating the regulation valve (5) in this spray gun group reducing agent control unit backward and compressed air control unit
Go out instruction to control flow, concentration and the expulsion pressure of each spray gun group reducing agent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610984777.5A CN106310910A (en) | 2016-11-09 | 2016-11-09 | Mixing distribution device for power station boiler SNCR denitration system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610984777.5A CN106310910A (en) | 2016-11-09 | 2016-11-09 | Mixing distribution device for power station boiler SNCR denitration system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106310910A true CN106310910A (en) | 2017-01-11 |
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ID=57816289
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610984777.5A Pending CN106310910A (en) | 2016-11-09 | 2016-11-09 | Mixing distribution device for power station boiler SNCR denitration system |
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| CN (1) | CN106310910A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202207547U (en) * | 2011-08-22 | 2012-05-02 | 湖南安普诺环保科技有限公司 | Reducing agent spraying control device of flue gas selective non-catalytic reduction (SNCR) denitration system |
| CN102824841A (en) * | 2012-08-21 | 2012-12-19 | 杨建华 | Selective non-catalytic reduction (SNCR) denitration system of coal-fired circulating fluidized bed boiler |
| CN103301737A (en) * | 2013-06-07 | 2013-09-18 | 大连贝斯特环境工程设备有限公司 | Urea hydrolyzed SNCR (selective non-catalytic reduction) flue gas denitrification device for fluidized bed boiler |
| CN203899439U (en) * | 2014-01-13 | 2014-10-29 | 广东清华中邦热能科技有限公司 | Novel SNCR (selective non-catalytic reduction) denitration system |
| CN104117279A (en) * | 2014-07-17 | 2014-10-29 | 中国华能集团公司 | SNCR denitration control system of power station boiler and control method of SNCR denitration control system |
| CN104307347A (en) * | 2014-10-30 | 2015-01-28 | 上海泰欣环保工程有限公司 | Efficient SNCR point-to-point injection system |
| US20150345785A1 (en) * | 2014-06-03 | 2015-12-03 | James M. Valentine | Infinitely Variable Injector For Improved SNCR Performance |
-
2016
- 2016-11-09 CN CN201610984777.5A patent/CN106310910A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202207547U (en) * | 2011-08-22 | 2012-05-02 | 湖南安普诺环保科技有限公司 | Reducing agent spraying control device of flue gas selective non-catalytic reduction (SNCR) denitration system |
| CN102824841A (en) * | 2012-08-21 | 2012-12-19 | 杨建华 | Selective non-catalytic reduction (SNCR) denitration system of coal-fired circulating fluidized bed boiler |
| CN103301737A (en) * | 2013-06-07 | 2013-09-18 | 大连贝斯特环境工程设备有限公司 | Urea hydrolyzed SNCR (selective non-catalytic reduction) flue gas denitrification device for fluidized bed boiler |
| CN203899439U (en) * | 2014-01-13 | 2014-10-29 | 广东清华中邦热能科技有限公司 | Novel SNCR (selective non-catalytic reduction) denitration system |
| US20150345785A1 (en) * | 2014-06-03 | 2015-12-03 | James M. Valentine | Infinitely Variable Injector For Improved SNCR Performance |
| CN104117279A (en) * | 2014-07-17 | 2014-10-29 | 中国华能集团公司 | SNCR denitration control system of power station boiler and control method of SNCR denitration control system |
| CN104307347A (en) * | 2014-10-30 | 2015-01-28 | 上海泰欣环保工程有限公司 | Efficient SNCR point-to-point injection system |
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Application publication date: 20170111 |
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