CN102580506B - 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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- CN102580506B CN102580506B CN201210061656.5A CN201210061656A CN102580506B CN 102580506 B CN102580506 B CN 102580506B CN 201210061656 A CN201210061656 A CN 201210061656A CN 102580506 B CN102580506 B CN 102580506B
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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 for SNCR denitrating technique, belong to Denitration in Boiler device technique field.
Background technology
China is main in the world coal production and country of consumption, is also to take the country that coal is main primary energy.According to statistics, 2002, raw coal proportion in China's primary energy forms was 70.7%, and accounts for 49.1% of consumption of coal for the coal generating electricity.In the flue gas that coal burning produces, contain flue dust, oxysulfide (SOx), nitrogen oxide (NOx) and CO
2deng pollutant, these pollutants enter atmosphere, have caused serious environmental problem ，Shi China sustainable economic development major issue anxious to be resolved.
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, have a strong impact on human health, nitrogen oxide causes serious harm to human body, environment, ecology.Along with the enhancing of environmental consciousness, government increases gradually to the control of discharged nitrous oxides and management.Promoted developing rapidly of denitration technology.
The gas denitrifying technology generally adopting 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.
System is simple, cost is low owing to having for SNCR technology (Selective Non-Catalytic Reduction, be called for short SNCR), denitration efficiency is compared with advantages of higher, is suitable for medium small boiler unit, has broad application prospects.Reducing agent spray gun is the key equipment of SNCR denitrating technique, and spray gun performance directly affects denitration efficiency.Because China's denitration technology is started late, domestic independent research technology is less, and denitrification reducing agent spray gun mostly is foreign patent technology, and its application and development is restricted.And existing reducing agent spray gun has that structure is single, atomizing effect is poor, when spray gun is stopped transport, cannot automatically exit, need cooling medium to carry out cooling to spray gun; In addition existing SNCR denitration easily causes reducing agent leakage current with spray gun, and reducing agent is dropped onto on water-cooling wall, causes water-wall corrosion and leakage.
Summary of the invention
For the deficiency of the reducing agent atomizing lance using in existing SNCR denitration technology, the invention provides a kind of internal-mixing reducing agent atomizing lance for SNCR denitrating technique.
An internal-mixing reducing agent atomizing lance for SNCR denitrating technique, comprises spray gun sleeve, electricpropulsion installation and spray gun, and spray gun sleeve is arranged on boiler casing and with boiler furnace and is communicated with, and 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 spray gun sleeve.
Described electricpropulsion installation is a kind of power driving mechanism of reciprocating linear operation, comprise drive motors, screw mandrel, screw, jaw, outer tube and mounting flange, the line shaft of drive motors is fixedly connected with screw mandrel, screw is arranged on screw mandrel, screw is fixedly connected with spray gun by 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 mounting flange of electricpropulsion installation on spray gun sleeve by bolt.
Described spray gun is comprised of spray gun shell, first passage, second channel, convergent-divergent shape structure, premixer, atomization inner core and jet, first passage, second channel, convergent-divergent shape structure, premixer and atomization inner core are all arranged in spray gun shell, and first passage is positioned at second channel; First passage one end is provided with reducing agent entrance, and first passage is communicated with premixer by convergent-divergent shape structure, and second channel one end is provided with atomizing medium entrance, and second channel is communicated with premixer by the first air inlet and the second air inlet; The first air inlet is arranged in convergent-divergent shape structure, and the second air inlet is arranged in the Shang， premixer, position of premixer near convergent-divergent shape structure and is provided with atomization inner core, and the outer end of atomization inner core is connected with the jet of spray gun.
A kind of method of work of the internal-mixing reducing agent atomizing lance for SNCR denitrating technique is as follows:
When system puts into operation, motor is rotated in the forward, by shaft coupling, drive screw mandrel to rotate, screw advances under the rotary action of screw mandrel, and drives spray gun to advance, and enters in burner hearth, atomizing medium respectively by the first air inlet and the second air inlet carry out mixing for twice with reducing agent, atomization, through jet, spray into boiler furnace, make the nitrogen oxide complete reaction in reducing agent and flue gas, reach denitration object; When system is stopped transport, motor reversal, screw retreats, and drives spray gun to exit burner hearth.
In the present invention; spray gun has propulsion plant; can advance as required or exit; this spray gun can be used for the 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 to import boiler furnace or cyclone separator; and by reducing agent atomization; make the reaction of nitrogen oxides in itself and flue gas, reduce the amount of nitrogen oxides of boiler emission flue gas, reach the object of protection of the environment.
Accompanying drawing explanation
Fig. 1 is SNCR denitrating technique spraying system figure.
Fig. 2 is spray gun schematic diagram.
Fig. 3 is spray gun structure figure.
Wherein, 1, spray gun, 2, spray gun sleeve, 3, electricpropulsion installation, 4, reducing agent entrance, 5, atomizing medium entrance, 6, first passage, 7, second channel, 8, spray gun shell, 9, convergent-divergent shape structure, the 10, first air inlet, the 11, second air inlet, 12, premixer, 13, atomization 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 drawings and Examples mode, the invention will be further described.
Embodiment: a kind of internal-mixing reducing agent atomizing lance for SNCR denitrating technique, as shown in Figure 1, Figure 2 and Figure 3, comprise spray gun sleeve (2), electricpropulsion installation (3) and spray gun (1), spray gun sleeve (2) is arranged on boiler casing and with boiler furnace and is communicated with, 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 reciprocating linear operation, 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 screw mandrel (16), screw (17) is fixedly connected with spray gun (1) by jaw (20), the outer outer sleeve (18) that is provided with of screw mandrel (16) of screw (17) outer end, the end of outer sleeve (18) is fixed on the mounting flange of electricpropulsion installation (3) (19) on spray gun sleeve (2) by bolt.
Described spray gun (1) is comprised of spray gun shell (8), first passage (6), second channel (7), convergent-divergent shape structure (9), premixer (12), atomization inner core (13) and jet (14), first passage (6), second channel (7), convergent-divergent shape structure (9), premixer (12) and atomization inner core (13) are all arranged in spray gun shell (8), and first passage (6) is positioned at second channel (7); First passage (6) one end is provided with reducing agent entrance (4), first passage (6) is communicated with premixer (12) by convergent-divergent shape structure (0), second channel (7) one end is provided with atomizing medium entrance (5), and second channel (7) is communicated with premixer (12) by the first air inlet (10) and the second air inlet (11); The first air inlet (10) is arranged in convergent-divergent shape structure (9), the second air inlet (11) is arranged on premixer (12) near on the position of convergent-divergent shape structure (9), in premixer (12), be provided with atomization inner core (13), the outer end of atomization 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 for SNCR denitrating technique is as follows:
When system puts into operation, motor is rotated in the forward, by shaft coupling, drive screw mandrel to rotate, screw advances under the rotary action of screw mandrel, and drives spray gun to advance, and enters in burner hearth, atomizing medium respectively by the first air inlet and the second air inlet carry out mixing for twice with reducing agent, atomization, through jet, spray into boiler furnace, make the nitrogen oxide complete reaction in reducing agent and flue gas, reach denitration object; When system is stopped transport, motor reversal, screw retreats, and drives spray gun to exit burner hearth.
Mix, atomization is abundant, reducing agent mist droplet particle size after spout ejection meets the demands, is evenly distributed, there is certain penetration depth, according to burner hearth size, the spray gun of design suitable quantity, the reducing agent of ejection can cover whole section of burner hearth, denitration reaction efficiency 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.The adjustable gas liquid ratio of spray gun is 15%～30%, lower by 20%～50% by spray gun gas consumption rate than conventional SNCR denitrating technique.
When denitrating system starts to put into operation, electricpropulsion installation, under control instruction, advances burner hearth inner by spray gun sleeve pipe spray gun, the valve open on reductant solution and atomizing medium pipeline, reducing agent and atomizing medium enter spray gun, and medium fully sprays into burner hearth inside after collision, atomization in spray gun.
When denitrating system is stopped transport, system is sent instruction, and electricpropulsion installation exits spray gun from burner hearth inside, prevents that long term high temperature from causing spray gun distortion or damage.
Claims (2)
1. the internal-mixing reducing agent atomizing lance for SNCR denitrating technique, comprise spray gun sleeve, electricpropulsion installation and spray gun, it is characterized in that, spray gun sleeve is arranged on boiler casing and with boiler furnace and is communicated with, 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 spray gun sleeve; Described electricpropulsion installation is a kind of power driving mechanism of reciprocating linear operation, comprise drive motors, screw mandrel, screw, jaw, outer tube and mounting flange, the line shaft of drive motors is fixedly connected with screw mandrel, screw is arranged on screw mandrel, screw is fixedly connected with spray gun by 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 mounting flange of electricpropulsion installation on spray gun sleeve by bolt; Described spray gun is comprised of spray gun shell, first passage, second channel, convergent-divergent shape structure, premixer, atomization inner core and jet, first passage, second channel, convergent-divergent shape structure, premixer and atomization inner core are all arranged in spray gun shell, and first passage is positioned at second channel; First passage one end is provided with reducing agent entrance, and first passage is communicated with premixer by convergent-divergent shape structure, and second channel one end is provided with atomizing medium entrance, and second channel is communicated with premixer by the first air inlet and the second air inlet; The first air inlet is arranged in convergent-divergent shape structure, and the second air inlet is arranged in the Shang， premixer, position of premixer near convergent-divergent shape structure and is provided with atomization inner core, and the outer end of atomization inner core is connected with the jet of spray gun.
2. a method of work for the internal-mixing reducing agent atomizing lance for SNCR denitrating technique as claimed in claim 1, is characterized in that, method of work is as follows:
When system puts into operation, motor is rotated in the forward, by shaft coupling, drive screw mandrel to rotate, screw advances under the rotary action of screw mandrel, and drives spray gun to advance, and enters in burner hearth, atomizing medium respectively by the first air inlet and the second air inlet carry out mixing for twice with reducing agent, atomization, through jet, spray into boiler furnace, make the nitrogen oxide complete reaction in reducing agent and flue gas, reach denitration object; When system is stopped transport, motor reversal, screw retreats, and drives spray gun to exit burner hearth.
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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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| 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 CN102580506A (en) | 2012-07-18 |
| CN102580506B true CN102580506B (en) | 2014-01-15 |
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| 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***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 |
| 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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| WO2001004561A1 (en) * | 1999-07-08 | 2001-01-18 | Veag Vereinigte Energiewerke Ag | 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 |
| CN102160964B (en) * | 2011-02-18 | 2013-06-05 | 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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