CN105642115A - Device and method for denitrifying flue gases - Google Patents

Device and method for denitrifying flue gases Download PDF

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Publication number
CN105642115A
CN105642115A CN201511023392.4A CN201511023392A CN105642115A CN 105642115 A CN105642115 A CN 105642115A CN 201511023392 A CN201511023392 A CN 201511023392A CN 105642115 A CN105642115 A CN 105642115A
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China
Prior art keywords
activation
reducing agent
flue gas
discharge
denitration
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CN201511023392.4A
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王仕龙
肖创英
韩平
闫克平
徐会军
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Shenhua Group Corp Ltd
Shenhua Guoneng Group Corp Ltd
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Shenhua Group Corp Ltd
Shenhua Guoneng Group Corp Ltd
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Priority to CN201511023392.4A priority Critical patent/CN105642115A/en
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Abstract

The invention relates to the field of flue gas treatment and discloses a device and a method for denitrifying flue gases. The device for denitrifying the flue gases comprises a discharge activation unit and a denitrifying unit which are sequentially connected, wherein the denitrifying unit is connected with a boiler (1). The method for denitrifying the flue gases comprises the following steps of introducing carrier gases into discharge activation equipment for performing activating treatment, mixing activated carrier gases formed by the activating treatment with a denitrifying reducing agent, and enabling the activated denitrifying reducing agent formed by mixing to contact with flue gases containing nitrogen oxides; or introducing the carrier gases containing the denitrifying reducing agent into the discharge activation equipment for performing activating treatment, and enabling the activated denitrifying reducing agent formed by the activating treatment to contact with the flue gases containing the nitrogen oxides. According to the device and the method for denitrifying the flue gases, provided by the invention, the denitrifying reducing agent can be activated, the reaction temperature is reduced, the utilization rate of ammonia is improved, the escape of the ammonia is reduced, and the denitrifying efficiency is improved.

Description

A kind of apparatus and method of denitrating flue gas
Technical field
The present invention relates to fume treatment field, in particular it relates to the apparatus and method of a kind of denitrating flue gas.
Background technology
Flue gas is one of predominant emissions of steam power plant, generation of being burnt in the boiler by combustible. Owing to flue gas usually containing substantial amounts of nitrogen oxides NOxSuch as NO, if these nitrogen oxides are directly discharged in air, causing the acid rain that corrosivity is very strong, therefore flue gas has to pass through denitrogenation (i.e. denitration) before discharge and processes.
At present, the gas denitrifying technology of comparative maturity is used mainly to have two kinds: SCR (SCR) technique and SNCR denitration (SNCR) technique. The chemical principle of SCR and SNCR denitration technique is just as, and is all spray into denitrfying agent (carbamide or ammonia) in flue gas, with the NO in flue gas in specific temperature rangexCarry out Chemoselective reduction and generate nitrogen (N2) and steam (H2O)��
SNCR technique is typically in the burner hearth of boiler the high-temperature region of 800-1300 DEG C and sprays into denitrfying agent carrying out Chemoselective reduction denitration process. But the efficiency that SNCR technique there is problems of denitration is low, when improving denitration efficiency by the addition of raising reducing agent, also inconspicuous and reducing agent the escape amount of effect is big. SCR technique is then that the region of back-end ductwork 280-420 DEG C carries out selective catalytic reduction reaction under catalyst existent condition. SCR technique is in order to improve denitration efficiency, and the addition of reducing agent can be excessive, the problem that also can there is the escaping of ammonia. In sum, in the application realizing nitrogen oxides minimum discharge, SCR and SNCR technology all exists that running temperature window is little, the escaping of ammonia and the big problem of partial denitrification efficiency low three. Therefore the new method of a kind of denitrating flue gas is developed to improve denitration efficiency, control the escaping of ammonia and to promote that low-temp reaction is necessary.
Summary of the invention
The invention aims to overcome that running temperature window in the prior art of denitrating flue gas is little, the escaping of ammonia and the inefficient defect of partial denitrification, the apparatus and method of a kind of denitrating flue gas are provided, these apparatus and method can activation denitration reducing agent, reduce reaction temperature, improve ammonia utilization rate and reduce the escaping of ammonia, improve denitration efficiency.
Specifically, the invention provides the device of a kind of denitrating flue gas, this equipment for denitrifying flue gas includes the discharge activation unit and the denitration unit that are linked in sequence, and described denitration unit is connected with boiler.
A kind of method that present invention also offers denitrating flue gas, the method includes, carrier gas is passed into discharge activation equipment and carries out activation processing, carrier gas after the activation that activation processing is formed mixes with denitrification reducing agent, the denitrification reducing agent of activation formed is contacted with the flue gas of nitrogen-containing oxide after mixing; Or,
Carrier gas containing denitrification reducing agent being passed into discharge activation equipment and carries out activation processing, the denitrification reducing agent of activation that activation processing is formed contacts with the flue gas of nitrogen-containing oxide.
Adopt the apparatus and method of the denitrating flue gas of the present invention, by the direct or indirect activation denitration reducing agent of discharge plasma, it is possible to realize the oxidation of ammonia and the reduction of NO at a lower temperature, widened the service condition of denitrification apparatus. It addition, the reducing agent of activation can improve reaction efficiency, escape thus reducing tail gas ammonia, it is to avoid secondary pollution and upstream device corrosion. The method of the present invention can improve the possible cause of denitration efficiency, when there is electrion in gas, it is possible to excited by gas molecule as high chemically active free radical, ion and molecular-excited state (OH, O, N, N2 +��O2 +��N2*��O2*��H2O*��CO2Etc.) or other active substances (O *3��H2O2��H3O+Deng), it is also possible to denitrification reducing agent is excited into corresponding living radical, ion and molecular-excited state (NH3 +��NH2��NH��NH-��NH3* etc.). The oxidation-reduction potential of these active substances is far above original denitrification reducing agent, it is easier to chemical reaction occurs; Energy barrier needed for denitration can also be reduced, thus it is temperature required to reduce reaction. To SCR denitration reaction unit, the ion of plasma-activated rear longlife noodles and molecular-excited state active substance reduce the activation temperature of catalyst with catalyst action, have widened downwards the running temperature window of SCR catalyst. Following oxidation that traditional ammonia SCR technology is built upon under equilibrium state catalyst and shows and reduction reaction NH3��NH2+ H, NH3��NH+H2, NH2+NO��H2O+N2, NH+NO �� OH+N2. Following oxidation that this method is built upon under nonequilibrium state catalyst and shows and reduction reaction NH3 *��NH2+ H, NH3 *��NH+H2, NH2+NO��H2O+N2, NH+NO �� OH+N2. Because NH3 *Having the Temperature Activity that comparison is high, catalyst can realize the oxidation of ammonia and the reduction of NO at a lower temperature. To SNCR process, the change of chemical reaction is such as same as above.
Other features and advantages of the present invention will be described in detail in detailed description of the invention part subsequently.
Accompanying drawing explanation
Accompanying drawing is used to provide a further understanding of the present invention, and constitutes the part of description, is used for explaining the present invention, but is not intended that limitation of the present invention together with detailed description below. In the accompanying drawings:
Fig. 1 be the present invention a kind of preferred embodiment in the device schematic diagram of denitrating flue gas;
Fig. 2 is the device schematic diagram of the denitrating flue gas in another preferred embodiment of the present invention;
Fig. 3 is the device schematic diagram of the denitrating flue gas in yet another preferred embodiment of the present invention;
Fig. 4 be the present invention still another preferred embodiment in the device schematic diagram of denitrating flue gas.
Description of reference numerals
1 boiler 2 discharge activation equipment
21 first discharge activation equipment 22 second discharge activation equipment
3 high voltage power supply 31 first high voltage power supplies
32 second high voltage power supply 4SCR denitrification apparatus
5 exhanst gas outlet 6SNCR denitrification apparatus
A denitrification reducing agent A1 the first denitrification reducing agent
A2 the second denitrification reducing agent B carrier gas
B1 the first carrier gas B2 the second carrier gas
Flue gas after C flue gas D denitration
The second flue gas after the first flue gas D2 denitration after D1 denitration
Detailed description of the invention
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail.It should be appreciated that detailed description of the invention described herein is merely to illustrate and explains the present invention, it is not limited to the present invention.
The invention provides the device of a kind of denitrating flue gas, this equipment for denitrifying flue gas includes the discharge activation unit and the denitration unit that are linked in sequence, and described denitration unit is connected with boiler 1.
Described discharge activation unit includes discharge activation equipment 2 and high voltage power supply 3. Described high voltage power supply 3 can be positive and negative pulsed high voltage generator, high-frequency ac high voltage power supply, alternating current-direct current superposition high voltage power supply, DC stacked positive and negative pulsed high voltage generator or DC high-voltage power supply. Described discharge activation equipment 4 is powered by described high voltage power supply 3, and power supply mode can be continuous, it is also possible to for interval.
In the present invention, described discharge activation equipment 2 can be the reaction of low temperature plasma device that this area is conventional, for instance can be discharging plasma reactor, it is preferred to dielectric barrier discharge reactor or streamer corona discharge reactor. Described dielectric impedance reactor includes high-pressure stage and earthing pole, is separated by dielectric layer in the middle of described high-pressure stage and earthing pole. Described streamer corona discharge reactor is made up of multiple high-pressure stages and multiple earthing poles, and high-pressure stage, between earthing pole, leaves discharging gap between described high-pressure stage and earthing pole.
In the present invention, the discharge type of described discharge activation equipment can be the conventional selection of this area, it is possible to determine according to the type of plasma reactor, for instance, the discharge type of described discharge activation equipment can take dielectric barrier discharge or streamer-discahrge.
In the present invention, described denitration unit can be at least one in SCR (SCR) denitrification apparatus 4 and SNCR (SNCR) denitrification apparatus 6.
In the present invention, the device of described denitrating flue gas can also include exhanst gas outlet 5. Preferably, SCR denitration device 4 is provided with exhanst gas outlet 5; Or, it is preferable that described SNCR denitration device 6 is connected with described boiler 1, and described boiler 1 is provided with exhanst gas outlet 5.
According to one preferred embodiment, as it is shown in figure 1, described equipment for denitrifying flue gas includes boiler 1, discharge activation unit and denitration unit, described denitration unit is SCR denitration device 4, and described discharge activation unit includes discharge activation equipment 2 and high voltage power supply 3. Wherein, described boiler 1 is connected with described SCR denitration device 4, and described discharge activation equipment 2 is connected with high voltage power supply 3, and described discharge activation equipment 2 is connected with described SCR denitration device 4, and described SCR denitration device 4 is provided with exhanst gas outlet 5.
According to another preferred embodiment, as in figure 2 it is shown, described equipment for denitrifying flue gas includes boiler 1, discharge activation unit and denitration unit, described denitration unit is SCR denitration device 4, and described discharge activation unit includes discharge activation equipment 2 and high voltage power supply 3. Wherein, described boiler 1 is connected with described SCR denitration device 4, described discharge activation equipment 2 is connected with high voltage power supply 3, and described discharge activation equipment 2 is connected with described SCR denitration device 4, is provided with the entrance of denitrification reducing agent between described discharge activation equipment 2 and described SCR denitration device 4. Described SCR denitration device 4 is provided with exhanst gas outlet 5.
According to yet another preferred embodiment, as it is shown on figure 3, described equipment for denitrifying flue gas includes boiler 1, discharge activation unit and denitration unit, described denitration unit is SNCR denitration device 6, and described discharge activation unit includes discharge activation equipment 2 and high voltage power supply 3.Wherein, described boiler 1 is connected with described SNCR denitration device 6, and described discharge activation equipment 2 is connected with high voltage power supply 3, and described discharge activation equipment 2 is connected with described SNCR denitration device 6, and described boiler 1 is provided with exhanst gas outlet 5.
According to still another preferred embodiment, as shown in Figure 4, described equipment for denitrifying flue gas includes boiler the 1, first discharge activation unit, the second discharge activation unit and denitration unit, described denitration unit is SCR denitration device 4 and SNCR denitration device 6, described first discharge activation unit includes the first discharge activation equipment 21 and the first high voltage power supply 31, and described second discharge activation unit includes the second discharge activation equipment 22 and the second high voltage power supply 32. Wherein, described boiler 1 is connected with described SNCR denitration device 6, and described SNCR denitration device 6 is connected with the first discharge activation equipment 21, and the first discharge activation equipment 21 is connected with the first high voltage power supply 31. Described boiler 1 is connected with described SCR denitration device 4, and described SCR denitration device 4 is connected with the second discharge activation equipment 22, and the second discharge activation equipment 22 is connected with the second high voltage power supply 32. Described SCR denitration device 4 is provided with exhanst gas outlet 5.
A kind of method that the invention provides denitrating flue gas, the method includes, carrier gas passing into discharge activation equipment and carries out activation processing, the carrier gas after the activation that activation processing is formed mixes with denitrification reducing agent, the denitrification reducing agent of activation formed is contacted with the flue gas of nitrogen-containing oxide after mixing; Or,
Carrier gas containing denitrification reducing agent being passed into discharge activation equipment and carries out activation processing, the denitrification reducing agent of activation that activation processing is formed contacts with the flue gas of nitrogen-containing oxide.
According to the present invention, described discharge activation equipment can be the discharge activation equipment 2 in equipment for denitrifying flue gas provided by the invention, for instance can be discharging plasma reactor.
In the present invention, the energy density that described discharge activation equipment 2 carries out activation processing injection is 1-50Wh/Nm3, it is preferred to 5-45Wh/Nm3. Described energy density refers to the power of discharge activation equipment and the ratio of the flow velocity of the gas entering discharge activation equipment.
In the present invention, the method for described denitrating flue gas can also include using high voltage power supply 3 that discharge activation equipment 2 is powered, and makes formation discharge activation district in discharge activation equipment 2. Wherein, supply voltage can be 5-60kV.
In the present invention, the condition of described contact includes: the denitrification reducing agent of described activation and nitrogen oxides in effluent NOxAmmonia nitrogen mol ratio can be 0.5-4:1, it is preferred to 1-3:1. In the present invention, described ammonia nitrogen mol ratio refers in nitrogen element, nitrogen and NO in flue gas in denitrification reducing agentxThe mol ratio of nitrogen (in NO). In the present invention, NOxConcentration refer to the concentration in NO.
In the present invention, the denitrification reducing agent of activation can carry out with contacting of the flue gas of nitrogen-containing oxide in denitration unit provided by the invention. Preferably, described denitration unit is SCR denitration device 4, and the condition of described contact also includes: temperature is 120-300 DEG C, more preferably 120-240 DEG C; The denitrification reducing agent of activation is 0.5-2:1 with the ammonia nitrogen mol ratio of nitrogen oxides in effluent, more preferably 1-1.8:1.
According to the present invention, the kind and the form that carry out the catalyst of flue gas SCR can be that the conventional of this area selects, and are well known to those skilled in the art. Such as described catalyst can make nitrogen oxides NO for variousxIt is converted into the catalyst of nitrogen, it is preferred to metal oxide catalyst.Described metal-oxide can be V2O5��Fe2O3��CuO��Cr2O3��Co3O4��NiO��CeO2��La2O3��Pr6O11��Nd2O3��Gd2O3��Yb2O3In one or more, it is preferable that V2O5. It is preferred that described catalyst is dispersed in TiO2Above, with V2O5For main active component, WO3Or MoO3For the vanadium titanium system of promoter, i.e. V2O5-WO3/TiO2Or V2O5-MoO3/TiO2. In reacting due to SCR, the existence of a large amount of flying dusts adds difficulty to the application of catalyst, for preventing blocking, reduce the pressure loss, increasing mechanical strength, it is preferable that by above-mentioned V2O5-WO3/TiO2Or V2O5-MoO3/TiO2Catalyst is fixed on corrosion resistant plate surface or makes ceramic honey comb shape, forms the version of rustless steel corrugated plate dst and ceramic honey comb. Above-mentioned catalyst is commercially available, for instance can purchased from the Cormetech company of Japan's catalyst chemical conversion, Hitachi, Ltd, Ya Jilong company of Germany and the U.S..
According to the present invention, in SCR denitration device, the mixing gas of the denitrification reducing agent of activation and flue gas can be 5000-12000 hour by the volume space velocity of catalyst layer-1, more preferably 6000-10000 hour-1��
In the present invention, preferably, described denitrification apparatus is SNCR denitration device 6, the condition of described contact also includes: temperature is 600-1400 DEG C, being more preferably 800-1200 DEG C, time of contact is the 0.2-1 second, more preferably the 0.4-0.9 second, the denitrification reducing agent of activation is 1-4:1 with the ammonia nitrogen mol ratio of nitrogen oxides in effluent, more preferably 1-3:1.
In the present invention, described SCR denitration device 4 and described SNCR denitration device 6 can exist simultaneously, run according to respective condition respectively.
In the present invention, described carrier gas can be selected from least one in air, oxygen and nitrogen, can optionally with one or more in carbon dioxide, water and hydrocarbon in described carrier gas. Described hydrocarbon refers to the material being made up of carbon and protium.
In the present invention, the kind of described denitrification reducing agent and form can be the conventional selections of this area, for instance, described denitrification reducing agent can be to produce the material of ammonia after ammonia or various heating, it is preferred at least one in liquefied ammonia, ammonia and carbamide. There is no particular limitation for the existence of described denitrification reducing agent, it is possible to for gaseous state, liquid, solid-state or combine arbitrarily, it is possible to preheating is so that flowing conveying. Preferably, described denitrification reducing agent passes in discharge activation equipment in gaseous form.
In the present invention, described flue gas can be the flue gas that various amount of nitrogen oxides needs to reduce, it is possible to be the flue gas from boiler without any process, it is also possible to be the flue gas crossed through dust removal process in advance. Can be from the flue gas of boiler of power plant, it is also possible to originate from the flue gas of steel-making boiler.
Below in conjunction with accompanying drawing, the preferred embodiment of the present invention is described in detail.
According to one of the present invention preferred embodiment, denitration method for flue gas provided by the invention can adopt equipment for denitrifying flue gas as shown in Figure 1 to realize, as it is shown in figure 1, containing NOxFlue gas C discharge from boiler 1, enter in denitration unit, described denitration unit is SCR denitration device 4. Carrier gas B containing denitrification reducing agent A enters in discharge activation equipment 2 in gaseous form, discharge activation equipment 2 is powered by high voltage power supply 3, form discharge activation district, denitrification reducing agent activation is formed the denitrification reducing agent of activation, subsequently enter in denitration unit, described denitration unit is SCR denitration device 4, and under the catalytic action of the catalyst in SCR denitration device 4, the denitrification reducing agent of activation is by the NO in flue gasxIt is reduced to N2, the flue gas D after denitration discharges through exhanst gas outlet 5.
According to another preferred embodiment of the present invention, the method of denitrating flue gas provided by the invention adopts the equipment for denitrifying flue gas shown in Fig. 2 to realize, as shown in Figure 3, carrier gas B enters in discharge activation equipment 2 in gaseous form, discharge activation equipment 2 is powered by high voltage power supply 3, form discharge activation district, carrier gas B activation is formed the carrier gas after activation. This device and the device shown in Fig. 1 are distinctive in that denitrification reducing agent is without discharge activation equipment 2, but between discharge activation equipment 2 and denitration unit, it is provided with the entrance of denitrification reducing agent, denitrification reducing agent A is entered by this entrance and mixes with the carrier gas after activation, form the denitrification reducing agent of activation, subsequently enter denitration unit. Described denitration unit is SCR denitration device 4. Under the catalytic action of the catalyst in SCR denitration device 4, the denitrification reducing agent of activation is by the NO in flue gas CxIt is reduced to N2, the flue gas D after denitration discharges through exhanst gas outlet 5.
According to yet another preferred embodiment of the present invention, denitration method for flue gas provided by the invention can adopt equipment for denitrifying flue gas as shown in Figure 3 to realize, as shown in Figure 3, carrier gas B containing denitrification reducing agent A enters in discharge activation equipment 2 in gaseous form, discharge activation equipment 2 is powered by high voltage power supply 3, form discharge activation district, denitrification reducing agent B is activated, form the denitrification reducing agent of activation. The denitrification reducing agent of activation enters in denitration unit. Described denitration unit is SNCR denitration device 6. NO in SNCR denitration device 6, in the denitrification reducing agent of activation and flue gas CxReaction, by NOxIt is reduced to N2, the flue gas D after denitration discharges through exhanst gas outlet 5.
Still another preferred embodiment according to the present invention, the method of denitrating flue gas provided by the invention adopts the equipment for denitrifying flue gas shown in Fig. 4 to realize, as shown in Figure 4, the first carrier gas B1 containing the first denitrification reducing agent A1 enters in the first discharge activation equipment 21 in gaseous form, first discharge activation equipment 21 is powered by the first high voltage power supply 31, form discharge activation district, the first denitrification reducing agent A1 is activated, form the first denitrification reducing agent of activation. First denitrification reducing agent of activation enters in the first denitration unit. Described first denitration unit is SNCR denitration device 6. NO in SNCR denitration device 6, in the first denitrification reducing agent of activation and the first flue gas C1xReaction, by NOxIt is reduced to N2, the first flue gas D1 after the denitration of formation enters the second denitration unit, and described second denitration unit is SCR denitration device 4. The second carrier gas B2 containing the second denitrification reducing agent A2 enters in the second discharge activation equipment 22 in gaseous form, second discharge activation equipment 22 is powered by the second high voltage power supply 32, form discharge activation district, second denitrification reducing agent A2 is activated, form the second denitrification reducing agent of activation, subsequently enter the second denitration unit, described second denitration unit is SCR denitration device 4, under the catalytic action of the catalyst in SCR denitration device 4, the second denitrification reducing agent of activation is by the NO in the first flue gas D1 after denitrationxIt is reduced to N2, the second flue gas D2 after denitration discharges through exhanst gas outlet 5.
Adopt above-mentioned preferred embodiment, and control condition in above-mentioned preferred scope, it is possible to obtain best denitrating flue gas effect.
Hereinafter will be described the present invention by embodiment.
In an embodiment, nitrogen oxides NOxConcentration record by the following method: chemoluminescence method (nitrogen-oxide analyzer, Sai Mo fly generation you, 42i-DNMSDAB).
Denitration efficiency=(NO in the flue gas before denitrationxConcentration-denitration after flue gas in NOxConcentration) NO in flue gas before/denitrationxConcentration �� 100%.
Embodiment 1
The present embodiment is for illustrating the apparatus and method of denitrating flue gas provided by the invention.
(1) structure of device
Discharge activation equipment 2 (being specially dielectric barrier discharge reactor) is connected with high voltage power supply 3 (being specially positive negative pulse stuffing high voltage power supply), dielectric barrier discharge reactor is provided with carrier gas inlet, the outlet of dielectric barrier discharge reactor is connected by the entrance of pipeline with described SCR denitration device 4, and the outlet of boiler 1 is connected by the entrance of pipeline with SCR denitration device 4. SCR denitration device 4 is provided with exhanst gas outlet 5. Obtain the equipment for denitrifying flue gas shown in Fig. 1.
(2) denitrating flue gas
Equipment for denitrifying flue gas according to Fig. 1, adopts typical Shenhua bituminous coal to burn in boiler 1, produces flue gas, and this flue gas enters in SCR denitration device 4. NO in flue gasxConcentration (counting with NO) be 350mg/Nm3��
The ammonia that concentration is 24.5 weight % is passed in dielectric barrier discharge reactor with air-atomized form. Dielectric barrier discharge reactor is powered by positive negative pulse stuffing high voltage power supply, and supply voltage is 60kV volt, and the energy density that dielectric barrier discharge reactor injects is 5Wh/Nm3. Ammonia in ammonia is activated by discharge activation district, forms the denitrification reducing agent NH of activation3 +, subsequently enter in SCR denitration device 4 and contact with flue gas and catalyst vanadic anhydride. Wherein, the denitrification reducing agent NH of activation3 +Being 1.2:1 with the ammonia nitrogen mol ratio of the nitrogen oxides in flue gas, flue gas is 6000 hours by the volume space velocity of catalyst layer-1, Contact Temperature is 120 DEG C. NO in flue gas after denitrationxConcentration (counting with NO) be 20mg/Nm3. Denitration efficiency is 94%. Escape ammonia concentration in SCR denitration device tail gas is lower than 3mg/m3��
Embodiment 2
The present embodiment is for illustrating the apparatus and method of denitrating flue gas provided by the invention.
(1) structure of device
Discharge activation equipment 2 (being specially dielectric barrier discharge reactor) is connected with high voltage power supply 3 (being specially positive negative pulse stuffing high voltage power supply), dielectric barrier discharge reactor is provided with carrier gas inlet, the outlet of dielectric barrier discharge reactor is connected by the entrance of pipeline with SNCR denitration device 6, and boiler 1 is connected with SNCR denitration device 6. Boiler 1 is provided with exhanst gas outlet 5. Obtain the equipment for denitrifying flue gas shown in Fig. 3.
(2) denitrating flue gas
Equipment for denitrifying flue gas according to Fig. 3, adopts typical Shenhua bituminous coal to burn in boiler 1, produces flue gas, and this flue gas enters in SNCR denitration device 6. NO in flue gasxConcentration (counting with NO) be 250mg/Nm3��
The ammonia that concentration is 15 weight % is passed in dielectric barrier discharge reactor with air-atomized form, dielectric barrier discharge reactor is powered by positive negative pulse stuffing high voltage power supply, supply voltage is 60kV volt, and the energy density that dielectric barrier discharge reactor injects is 20Wh/Nm3. In discharge activation district, the ammonia in ammonia is activated, form the denitrification reducing agent NH of activation3 +, subsequently enter in SNCR denitration device 6 and contact with flue gas, catalyst. Wherein, the ammonia nitrogen mol ratio of the nitrogen oxides in the denitrification reducing agent of activation and flue gas is 1.3:1, and Contact Temperature is 800 DEG C, and time of contact is 0.6 second. NO in flue gas after denitrationxConcentration (counting with NO) be 40mg/Nm3. Denitration efficiency is 84%. Escape ammonia concentration in SNCR denitration device exhaust is lower than 3mg/m3��
Comparative example 1
Adopting the device in embodiment 1 and condition, the difference is that not including dielectric barrier discharge reactor and positive negative pulse stuffing high voltage power supply, the entrance of SCR denitration device is only connected with the outlet of boiler 1.Additionally different also have, and flue gas passes through beds, and Contact Temperature is 320 DEG C. Denitration efficiency is 85%. Escape ammonia concentration in SCR denitration device tail gas is higher than 3mg/m3��
Comparative example 2
Adopting the device in embodiment 2 and condition, the difference is that not including dielectric barrier discharge reactor and positive negative pulse stuffing high voltage power supply, SNCR denitration device is only connected with boiler 1. Additionally different also have, and Contact Temperature is 1300 DEG C. Denitration efficiency is 60%. Escape ammonia concentration in SNCR denitration device exhaust is higher than 3mg/m3��
By the result of embodiment and comparative example it can be seen that adopt equipment for denitrifying flue gas provided by the invention and method, it is possible to the running temperature of SCR denitration device and SNCR denitration device reduced, denitration efficiency improves simultaneously. It addition, compared with comparative example, the escape ammonia concentration in the denitrification apparatus tail gas of embodiment reduces.
The preferred embodiment of the present invention is described in detail above in association with accompanying drawing; but; the present invention is not limited to the detail in above-mentioned embodiment; in the technology concept of the present invention; technical scheme can being carried out multiple simple variant, these simple variant belong to protection scope of the present invention.
It is further to note that each the concrete technical characteristic described in above-mentioned detailed description of the invention, in reconcilable situation, it is possible to be combined by any suitable mode. In order to avoid unnecessary repetition, various possible compound modes are no longer illustrated by the present invention separately.
Additionally, can also carry out combination in any between the various different embodiment of the present invention, as long as it is without prejudice to the thought of the present invention, it should be considered as content disclosed in this invention equally.

Claims (10)

1. the device of a denitrating flue gas, it is characterised in that this equipment for denitrifying flue gas includes the discharge activation unit and the denitration unit that are linked in sequence, and described denitration unit is connected with boiler (1).
2. device according to claim 1, wherein, described discharge activation unit includes discharge activation equipment (2) and high voltage power supply (3).
3. device according to claim 2, wherein, described discharge activation equipment (2) is discharging plasma reactor, it is preferred to dielectric barrier discharge reactor or streamer corona discharge reactor.
4. device according to claim 1, wherein, described denitration unit is at least one in SCR denitration device (4) and SNCR denitration device (6).
5. the method for a denitrating flue gas, it is characterized in that, the method includes, and carrier gas passes into discharge activation equipment and carries out activation processing, carrier gas after the activation that activation processing is formed mixes with denitrification reducing agent, the denitrification reducing agent of activation formed is contacted with the flue gas of nitrogen-containing oxide after mixing; Or,
Carrier gas containing denitrification reducing agent being passed into discharge activation equipment and carries out activation processing, the denitrification reducing agent of activation that activation processing is formed contacts with the flue gas of nitrogen-containing oxide.
6. method according to claim 5, wherein, the energy density that described discharge activation equipment (2) carries out activation processing injection is 1-50Wh/Nm3, it is preferred to 5-45Wh/Nm3��
7. method according to claim 5, wherein, the method for described denitrating flue gas also includes using high voltage power supply (3) that discharge activation equipment (2) is powered, and makes to be formed in discharge activation equipment (2) discharge activation district.
8. method according to claim 5, wherein, the condition of described contact includes: the denitrification reducing agent of described activation and nitrogen oxides in effluent NOxAmmonia nitrogen mol ratio be 0.5-4:1, it is preferred to 1-3:1;
Preferably, described denitration unit is SCR denitration device (4), and the condition of described contact also includes: temperature is 120-300 DEG C, more preferably 120-240 DEG C; The denitrification reducing agent of activation is 0.5-2:1 with the ammonia nitrogen mol ratio of nitrogen oxides in effluent, more preferably 1-1.8:1;
Preferably, described denitrification apparatus is SNCR denitration device (6), the condition of described contact also includes: temperature is 600-1400 DEG C, it is more preferably 800-1200 DEG C, time of contact is the 0.2-1 second, it is more preferably the 0.4-0.9 second, the ammonia nitrogen mol ratio 1-4:1 of the denitrification reducing agent of activation and nitrogen oxides in effluent, more preferably 1-3:1.
9. method according to claim 8, wherein, in SCR denitration device, the mixing gas of the denitrification reducing agent of activation and flue gas is 5000-12000 hour by the volume space velocity of catalyst layer-1, more preferably 6000-10000 hour-1��
10. method according to claim 5, wherein, described carrier gas at least one in air, oxygen and nitrogen, optionally with one or more in carbon dioxide, water and hydrocarbon in described carrier gas.
CN201511023392.4A 2015-12-31 2015-12-31 Device and method for denitrifying flue gases Pending CN105642115A (en)

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Application publication date: 20160608