CN102580506A - Inside-mixing type reducing agent atomizing spray gun for SNCR (Selective Non-Catalytic Reduction) denitration process - Google Patents
Inside-mixing type reducing agent atomizing spray gun for SNCR (Selective Non-Catalytic Reduction) denitration process Download PDFInfo
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- CN102580506A CN102580506A CN2012100616565A CN201210061656A CN102580506A CN 102580506 A CN102580506 A CN 102580506A CN 2012100616565 A CN2012100616565 A CN 2012100616565A CN 201210061656 A CN201210061656 A CN 201210061656A CN 102580506 A CN102580506 A CN 102580506A
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Abstract
The invention discloses an inside-mixing type reducing agent atomizing spray gun for an SNCR (Selective Non-Catalytic Reduction) denitration process, belonging to the technical field of boiler denitration devices. The inside-mixing type reducing agent atomizing spray gun comprises a spray gun sleeve, an electric propulsion plant and a spray gun and is characterized in that the spray gun sleeve is installed on the external wall of a boiler and communicated with a boiler hearth; the spray gun sleeve is inclined downward and has an included angle of 5-15 degrees with the horizontal plane; and the electric propulsion plant is fixedly connected with the spray gun and fixedly connected with the spray gun sleeve. When the system is put into operation, a motor is rotated forward and drives a screw rod to rotate through a coupler, a screw nut is moved forward in the rotation action of the screw rod and drives the spray gun to move forward and enter the hearth to spray; and when the system is shut down, the motor is rotated reversely and the screw nut moves backward to drive the spray gun to exit the hearth. The inside-mixing type reducing agent atomizing spray gun disclosed by the invention has the advantages of good atomizing effect, high degree of automation, low rate of gas consumption and prevention of corrosion to a water-cooled wall and is applicable to boilers such as a medium-small coal-powder boiler and a circulating fluidized bed the like; and the atomizing medium can be compressed air or steam.
Description
Technical field
The present invention relates to a kind of internal-mixing reducing agent atomizing lance of the SNCR of being used for denitrating technique, belong to boiler denitrification apparatus technical field.
Background technology
China is main coal production and consumption state in the world, also is to be the country of main primary energy with coal.According to statistics, 2002, raw coal proportion in China's primary energy constitutes was 70.7%, and the coal that is used to generate electricity accounts for 49.1% of consumption of coal.Contain flue dust, oxysulfide (SOx), nitrogen oxide (NOx) and CO in the flue gas that coal burning produces
2Deng pollutant, these pollutants enter atmosphere, have caused serious environmental problem, are China's sustainable economic development major issues anxious to be solved.
Along with the nitrogen oxide of fume emission, not only can cause greenhouse effects, form nitric acid type acid rain, be again one of main matter that forms photochemical fog, damages the ozone layer.And nitrogen oxide has very strong toxicity, has a strong impact on human health, and nitrogen oxide causes serious harm to human body, environment, ecology.Along with the enhancing of environmental consciousness, government increases the control and the management of discharged nitrous oxides gradually.Promoted developing rapidly of denitration technology.
The gas denitrifying technology that generally adopts at present mainly contains SCR technology (Selective Catalytic Reduction; Abbreviation SCR), SNCR technology (Selective Non-Catalytic Reduction is called for short SNCR) and SNCR/SCR mixed flue gas denitration technology.
SNCR technology (Selective Non-Catalytic Reduction is called for short SNCR) because have that system is simple, cost is low, denitration efficiency is than advantages such as height, is suitable for the medium small boiler unit, have broad application prospects.The reducing agent spray gun is the key equipment of SNCR denitrating technique, and the spray gun performance directly influences denitration efficiency.Because China's denitration technology is started late, domestic independent research technology is less, and mostly the denitrification reducing agent spray gun is the foreign patent technology, and its application and development are restricted.And existing reducing agent spray gun has that structure is single, atomizing effect is poor, when spray gun is stopped transport, can't withdraw from automatically, needs cooling medium that spray gun is cooled off; Existing in addition SNCR denitration causes the reducing agent leakage current easily with spray gun, and reducing agent is dropped onto on the water-cooling wall, causes water-wall corrosion and leakage.
Summary of the invention
To the deficiency of the reducing agent atomizing lance that uses in the existing SNCR denitration technology, the present invention provides a kind of internal-mixing reducing agent atomizing lance of the SNCR of being used for denitrating technique.
A kind of internal-mixing reducing agent atomizing lance that is used for the SNCR denitrating technique comprises spray gun sleeve, electricpropulsion installation and spray gun, and the spray gun sleeve is installed on the boiler casing and with boiler furnace and is communicated with, and the spray gun sleeve is downward-sloping, becomes 5～15 ° of angles with horizontal plane; Electricpropulsion installation is fixedly connected with spray gun, and electricpropulsion installation is fixedly connected with the spray gun sleeve.
Described electricpropulsion installation is a kind of power driving mechanism of reciprocal linear running; Comprise drive motors, screw mandrel, screw, jaw, outer tube and mounting flange; The line shaft of drive motors is fixedly connected with screw mandrel, and screw is arranged on the screw mandrel, and screw is fixedly connected with spray gun through jaw; The screw mandrel of screw outer end is provided with an outer sleeve outward, and the end of outer sleeve is fixed on the spray gun sleeve through the mounting flange of bolt with electricpropulsion installation.
Described spray gun is made up of spray gun shell, first passage, second channel, convergent-divergent shape structure, premixer, atomizing inner core and jet; First passage, second channel, convergent-divergent shape structure, premixer and atomizing inner core all are installed in the spray gun shell, and first passage is positioned at second channel; First passage one end is provided with the reducing agent inlet, and first passage is communicated with the premixer through convergent-divergent shape structure, and second channel one end is provided with the atomizing medium inlet, and second channel is communicated with the premixer through first air inlet and second air inlet; First air inlet is arranged on the convergent-divergent shape structure, and second air inlet is arranged on the position of premixer near convergent-divergent shape structure, is provided with the atomizing inner core in the premixer, and the outer end of atomizing inner core is connected with the jet of spray gun.
A kind of method of work of the internal-mixing reducing agent atomizing lance that is used for the SNCR denitrating technique is following:
When system put into operation, motor was rotated in the forward, and drove screw mandrel through shaft coupling and rotated; Screw advances under the rotary action of screw mandrel, and drives spray gun and advance, and gets in the burner hearth; Atomizing medium respectively through first air inlet and second air inlet carry out mixing for twice with reducing agent, atomizing; Spray into boiler furnace through jet, make the nitrogen oxide complete reaction in reducing agent and the flue gas, reach the denitration purpose; When system stops transport, the motor counter-rotating, screw is retreated, and drives spray gun and withdraws from burner hearth.
Among the present invention; Spray gun has propulsion plant, can advance as required or withdraw from, this spray gun can be used for types such as Medium and Small-sized Pulverized Coal-fired Boilers, recirculating fluidized bed boiler, be used for denitrification reducing agent urea or ammonia spirit are imported boiler furnace or cyclone separator; And reducing agent atomized; Make the reaction of nitrogen oxides in itself and the flue gas, reduce the amount of nitrogen oxides of boiler emission flue gas, reach the purpose of protection environment.
Description of drawings
Fig. 1 is SNCR denitrating technique spraying system figure.
Fig. 2 is the spray gun sketch map.
Fig. 3 is spray gun structure figure.
Wherein, 1, spray gun, 2, the spray gun sleeve, 3, electricpropulsion installation, 4, the reducing agent inlet, 5, atomizing medium inlet; 6, first passage, 7, second channel, 8, the spray gun shell, 9, convergent-divergent shape structure, 10, first air inlet; 11, second air inlet, 12, the premixer, 13, the atomizing inner core, 14, jet, 15, drive motors; 16, screw mandrel, 17, screw, 18, outer tube, 19, mounting flange, 20, jaw.
The specific embodiment
Below in conjunction with accompanying drawing and by way of example the present invention is described further.
Embodiment: a kind of internal-mixing reducing agent atomizing lance that is used for the SNCR denitrating technique; Like Fig. 1, Fig. 2 and shown in Figure 3; Comprise spray gun sleeve (2), electricpropulsion installation (3) and spray gun (1); Spray gun sleeve (2) is installed on the boiler casing and with boiler furnace and is communicated with, and spray gun sleeve (2) is downward-sloping, becomes 5～15 ° of angles with horizontal plane; Electricpropulsion installation (3) is fixedly connected with spray gun (1), and electricpropulsion installation (3) is fixedly connected with spray gun sleeve (2).
Described electricpropulsion installation (3) is a kind of power driving mechanism of reciprocal linear running; Comprise drive motors (15), screw mandrel (16), screw (17), jaw (20), outer tube (18) and mounting flange (19); The line shaft of drive motors (15) is fixedly connected with screw mandrel (16); Screw (17) is arranged on the screw mandrel (16); Screw (17) is fixedly connected with spray gun (1) through jaw (20), and the screw mandrel (16) of screw (17) outer end is outer to be provided with an outer sleeve (18), and the end of outer sleeve (18) is fixed on the spray gun sleeve (2) through the mounting flange (19) of bolt with electricpropulsion installation (3).
Described spray gun (1) is made up of spray gun shell (8), first passage (6), second channel (7), convergent-divergent shape structure (9), premixer (12), atomizing inner core (13) and jet (14); First passage (6), second channel (7), convergent-divergent shape structure (9), premixer (12) and atomizing inner core (13) all are installed in the spray gun shell (8), and first passage (6) is positioned at second channel (7); First passage (6) one ends are provided with reducing agent inlet (4); First passage (6) is communicated with premixer (12) through convergent-divergent shape structure (0); Second channel (7) one ends are provided with atomizing medium inlet (5), and second channel (7) is communicated with premixer (12) through first air inlet (10) and second air inlet (11); First air inlet (10) is arranged on the convergent-divergent shape structure (9); Second air inlet (11) is arranged on the position of premixer (12) near convergent-divergent shape structure (9); Be provided with atomizing inner core (13) in the premixer (12), the outer end of atomizing inner core (13) is connected with the jet (14) of spray gun (1).
A kind of method of work of the internal-mixing reducing agent atomizing lance that is used for the SNCR denitrating technique is following:
When system put into operation, motor was rotated in the forward, and drove screw mandrel through shaft coupling and rotated; Screw advances under the rotary action of screw mandrel, and drives spray gun and advance, and gets in the burner hearth; Atomizing medium respectively through first air inlet and second air inlet carry out mixing for twice with reducing agent, atomizing; Spray into boiler furnace through jet, make the nitrogen oxide complete reaction in reducing agent and the flue gas, reach the denitration purpose; When system stops transport, the motor counter-rotating, screw is retreated, and drives spray gun and withdraws from burner hearth.
Mix, atomizing fully meets the demands, is evenly distributed through the reducing agent mist droplet particle size after the spout ejection; Has certain penetration depth; According to the burner hearth size, the spray gun of design suitable quantity, the reducing agent of ejection can cover whole section of burner hearth; Denitration reaction efficient be can improve, reducing agent escapement ratio and secondary pollution reduced.
First passage, second channel import pressure medium 0.4～0.6MPa, reductant solution flow 10g/s～50g/s.Lance ejection distance 1.5～2.5m, average Suo Taier diameter: 50～100 μ m.Spray gun scalable gas liquid ratio is 15%～30%, hangs down 20%～50% than conventional SNCR denitrating technique with spray gun gas consumption rate.
When denitrating system begins to put into operation; Electricpropulsion installation advances burner hearth inner through the spray gun sleeve pipe spray gun, the valve open on reductant solution and the atomizing medium pipeline under control instruction; Reducing agent and atomizing medium get into spray gun, spray into burner hearth inside after medium fully collides in spray gun, atomizes.
When denitrating system was stopped transport, system sent instruction, and electricpropulsion installation withdraws from spray gun from burner hearth inside, prevented that long term high temperature from causing spray gun distortion or damage.
Claims (4)
1. internal-mixing reducing agent atomizing lance that is used for the SNCR denitrating technique; Comprise spray gun sleeve, electricpropulsion installation and spray gun, it is characterized in that the spray gun sleeve is installed on the boiler casing and with boiler furnace and is communicated with; The spray gun sleeve is downward-sloping, becomes 5～15 ° of angles with horizontal plane; Electricpropulsion installation is fixedly connected with spray gun, and electricpropulsion installation is fixedly connected with the spray gun sleeve.
2. a kind of internal-mixing reducing agent atomizing lance that is used for the SNCR denitrating technique as claimed in claim 1; It is characterized in that; Described electricpropulsion installation is a kind of power driving mechanism of reciprocal linear running, comprises drive motors, screw mandrel, screw, jaw, outer tube and mounting flange, and the line shaft of drive motors is fixedly connected with screw mandrel; Screw is arranged on the screw mandrel; Screw is fixedly connected with spray gun through jaw, and the screw mandrel of screw outer end is provided with an outer sleeve outward, and the end of outer sleeve is fixed on the spray gun sleeve through the mounting flange of bolt with electricpropulsion installation.
3. a kind of internal-mixing reducing agent atomizing lance that is used for the SNCR denitrating technique as claimed in claim 1; It is characterized in that; Described spray gun is made up of spray gun shell, first passage, second channel, convergent-divergent shape structure, premixer, atomizing inner core and jet; First passage, second channel, convergent-divergent shape structure, premixer and atomizing inner core all are installed in the spray gun shell, and first passage is positioned at second channel; First passage one end is provided with the reducing agent inlet, and first passage is communicated with the premixer through convergent-divergent shape structure, and second channel one end is provided with the atomizing medium inlet, and second channel is communicated with the premixer through first air inlet and second air inlet; First air inlet is arranged on the convergent-divergent shape structure, and second air inlet is arranged on the position of premixer near convergent-divergent shape structure, is provided with the atomizing inner core in the premixer, and the outer end of atomizing inner core is connected with the jet of spray gun.
4. method of work that is used for the internal-mixing reducing agent atomizing lance of SNCR denitrating technique is characterized in that method of work is following:
When system put into operation, motor was rotated in the forward, and drove screw mandrel through shaft coupling and rotated; Screw advances under the rotary action of screw mandrel, and drives spray gun and advance, and gets in the burner hearth; Atomizing medium respectively through first air inlet and second air inlet carry out mixing for twice with reducing agent, atomizing; Spray into boiler furnace through jet, make the nitrogen oxide complete reaction in reducing agent and the flue gas, reach the denitration purpose; When system stops transport, the motor counter-rotating, screw is retreated, and drives spray gun and withdraws from burner hearth.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210061656.5A CN102580506B (en) | 2012-03-09 | 2012-03-09 | Inside-mixing type reducing agent atomizing spray gun for SNCR (Selective Non-Catalytic Reduction) denitration process |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210061656.5A CN102580506B (en) | 2012-03-09 | 2012-03-09 | Inside-mixing type reducing agent atomizing spray gun for SNCR (Selective Non-Catalytic Reduction) denitration process |
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| CN102580506A true CN102580506A (en) | 2012-07-18 |
| CN102580506B CN102580506B (en) | 2014-01-15 |
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| CN201210061656.5A Expired - Fee Related CN102580506B (en) | 2012-03-09 | 2012-03-09 | Inside-mixing type reducing agent atomizing spray gun for SNCR (Selective Non-Catalytic Reduction) denitration process |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103506000A (en) * | 2013-10-15 | 2014-01-15 | 华电电力科学研究院 | Atomization ejection device and method for SNCR (Selective Non Catalytic Reduction) denitration |
| CN105618311A (en) * | 2014-10-29 | 2016-06-01 | 上海佳地喷雾系统有限公司 | Electric telescopic spray gun |
| CN108716688A (en) * | 2018-06-27 | 2018-10-30 | 北京蓝图工程设计有限公司 | A kind of coal-burning boiler and method of flue gas nitrogen oxide low emission |
| CN109529590A (en) * | 2019-01-09 | 2019-03-29 | 王煜翔 | A kind of equipment for denitrifying flue gas |
| CN112696663A (en) * | 2020-12-29 | 2021-04-23 | 四川省洪雅青衣江元明粉有限公司 | Method for controlling low-nitrogen combustion of boiler |
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| EP1198693B1 (en) * | 1999-07-08 | 2004-03-24 | Vattenfall Europe Generation AG & Co. KG | Water lance blower for cleaning heat exchangers, especially of a combustion chamber heating surface |
| CN102085452A (en) * | 2010-11-29 | 2011-06-08 | 中国环境科学研究院 | Reducing agent atomization spray gun for selective non-catalytic reduction denitration process |
| CN102160964A (en) * | 2011-02-18 | 2011-08-24 | 中国航天科技集团公司第六研究院第十一研究所 | Selective non-catalytic reduction (SNCR) denitration multi-nozzle long-gun injector |
| CN202490570U (en) * | 2012-03-09 | 2012-10-17 | 山东山大华特环保工程有限公司 | Internal-mixing type reducing agent atomization spray gun for SNCR denitration process |
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2012
- 2012-03-09 CN CN201210061656.5A patent/CN102580506B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| EP1198693B1 (en) * | 1999-07-08 | 2004-03-24 | Vattenfall Europe Generation AG & Co. KG | Water lance blower for cleaning heat exchangers, especially of a combustion chamber heating surface |
| CN102085452A (en) * | 2010-11-29 | 2011-06-08 | 中国环境科学研究院 | Reducing agent atomization spray gun for selective non-catalytic reduction denitration process |
| CN102160964A (en) * | 2011-02-18 | 2011-08-24 | 中国航天科技集团公司第六研究院第十一研究所 | Selective non-catalytic reduction (SNCR) denitration multi-nozzle long-gun injector |
| CN202490570U (en) * | 2012-03-09 | 2012-10-17 | 山东山大华特环保工程有限公司 | Internal-mixing type reducing agent atomization spray gun for SNCR denitration process |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103506000A (en) * | 2013-10-15 | 2014-01-15 | 华电电力科学研究院 | Atomization ejection device and method for SNCR (Selective Non Catalytic Reduction) denitration |
| CN103506000B (en) * | 2013-10-15 | 2015-07-08 | 华电电力科学研究院 | Atomization ejection device and method for SNCR (Selective Non Catalytic Reduction) denitration |
| CN105618311A (en) * | 2014-10-29 | 2016-06-01 | 上海佳地喷雾系统有限公司 | Electric telescopic spray gun |
| CN108716688A (en) * | 2018-06-27 | 2018-10-30 | 北京蓝图工程设计有限公司 | A kind of coal-burning boiler and method of flue gas nitrogen oxide low emission |
| CN109529590A (en) * | 2019-01-09 | 2019-03-29 | 王煜翔 | A kind of equipment for denitrifying flue gas |
| CN112696663A (en) * | 2020-12-29 | 2021-04-23 | 四川省洪雅青衣江元明粉有限公司 | Method for controlling low-nitrogen combustion of boiler |
| CN112696663B (en) * | 2020-12-29 | 2023-06-02 | 四川省洪雅青衣江元明粉有限公司 | Method for controlling low-nitrogen combustion of boiler |
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| CN102580506B (en) | 2014-01-15 |
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