CN102961963B - High-concentration nitrogen oxide waste gas catalytic decomposing method - Google Patents
High-concentration nitrogen oxide waste gas catalytic decomposing method Download PDFInfo
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- CN102961963B CN102961963B CN201210494575.4A CN201210494575A CN102961963B CN 102961963 B CN102961963 B CN 102961963B CN 201210494575 A CN201210494575 A CN 201210494575A CN 102961963 B CN102961963 B CN 102961963B
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Abstract
The invention discloses a high-concentration nitrogen oxide waste gas catalytic decomposing method. An employed catalytic decomposing device comprises a housing, a cavity, a waste gas inlet and a waste gas outlet, wherein the cavity is internally provided with a catalyst bed and a heating device. The method comprises the following steps: adding one or more catalytic catalysts of active iron, active carbon, coke and charcoal; heating the catalytic catalysts to 900-1000 DEG C by using the heating device, reaching a preset temperature and keeping; guiding the high-concentration nitrogen oxide waste gas into the cavity from the waste gas inlet, reacting the high-concentration nitrogen oxide with the catalytic catalysts, and discharging the reaction product from the waste gas outlet. By adopting the high-concentration nitrogen oxide waste gas catalytic decomposing method, the problem of detoxifying treatment of the high-concentration nitrogen oxide waste gas produced in the process of nitration reaction is solved.
Description
Technical field
The present invention relates to a kind of processing method of nitrous oxides exhaust gas, particularly relate to the catalytic decomposing method of the high concentration nitrous oxides exhaust gas produced in a kind of nitration reaction process.
Background technology
Nitrogen oxide is the gas that a kind of poisonous and harmful, corrosivity are very strong, has nitro compound and the chemical reaction that has nitric acid to participate in all can produce the pernicious gas of nitrogen-containing oxide, the health of serious harm environment and people, animal.
Nitrogen oxide containing low concentration in vehicle exhaust, the catalyst pipe that the catalyst be made up of rare precious metal and rare earth metal is formed deals with.The high concentration nitrogen oxide produced in industry generally absorbs with soda solution grouting or reductant solution drip washing, but not thorough, and produces secondary pollution.Up-to-date reductive coke method, treatment effect is good, but its weak point is that equipment is huge, and the tired lock of operation, expense is comparatively large, and a large amount of catalyst is used for the consumption of himself oxidation reaction.
Summary of the invention
The object of the invention is to the above-mentioned weak point overcoming prior art, research adopts catalyst to carry out catalytic decomposition high concentration nitrous oxides exhaust gas, by electric heater unit, makes catalyst catalyst be heated to 900-1000 DEG C, high concentration nitrous oxides exhaust gas, by catalyst bed, is decomposed into nontoxic N
2.The invention solves in nitration reaction process, the Non-toxic process problem of the high concentration nitrous oxides exhaust gas of generation.
The technical scheme realizing the object of the invention is:
A kind of high concentration nitrous oxides exhaust gas catalytic decomposing method, the catalytic decomposition device used comprises shell, cavity, waste gas introducing port, outlet port, also be provided with catalyst bed, heater in cavity, it is characterized in that one or more catalyst catalyst comprising the steps: to add to catalyst bed in active iron, active carbon, coke, charcoal; Catalyst catalyst is heated to 900-1000 DEG C by heater, keeps after reaching design temperature; High concentration nitrous oxides exhaust gas is passed into cavity by waste gas introducing port, and high concentration nitrogen oxide and catalyst catalyst reaction, product is discharged by outlet port.
Heater can use electric heater unit, and cavity inner wall is provided with heat-insulation layer, and heat-insulation layer is that ceramic thermal insulation is cotton.The material of shell is stainless steel.The bottom of cavity is provided with cleaning chamber, for collecting the catalyst catalyst and catalytic reaction products that are scattered, is convenient to timely cleaning.Electric heater unit can be provided with the control device of heating-up temperature, heat time, is convenient to the control of catalytic reaction.
Waste gas introducing port is located at the bottom of catalytic decomposition device, and outlet port is located at the top of catalytic decomposition device.Preferably, waste gas introducing port is located at the bottom of catalytic decomposition device, and outlet port is located at the top of catalytic decomposition device.Shell is provided with observation window, for observing the situation of high concentration nitrous oxides exhaust gas catalytic decomposition.Catalyst catalyst can be one or more in active iron, active carbon, coke, charcoal.
The beneficial effect that the present invention compared with prior art has is: nitrous oxides exhaust gas, with under the condition of air insulated, with high concentration nitrous oxides exhaust gas generation catalytic reaction after external heat, is decomposed into nontoxic N by catalyst catalyst
2, avoid the consumption of a large amount of catalyst catalyst for himself oxidation reaction; Employing electric heater unit heats, and is convenient to the accurate control of heating-up temperature, heat time, is more conducive to the control of catalytic reaction.
Figure of description
Fig. 1 is the structural representation of the catalytic decomposition device that the inventive method uses.
Detailed description of the invention
Below in conjunction with drawings and the specific embodiments, the present invention is further described in more detail.
Embodiment 1: see Fig. 1, a kind of high concentration nitrous oxides exhaust gas catalytic decomposing method, the catalytic decomposition device used, comprise shell 9, cavity 5, waste gas introducing port 10, outlet port 7, catalyst catalyst charging hole 6, also be provided with catalyst bed 1 in cavity, catalyst bed is for placing catalyst catalyst 3; Also be provided with electric heater unit 2 in cavity, electric heater unit can be provided with the control device of heating-up temperature, heat time, is convenient to the control of catalytic reaction.Cavity 5 inwall is provided with heat-insulation layer 8, and heat-insulation layer is that ceramic thermal insulation is cotton.The material of shell is stainless steel.Cavity is tubular, and its underpart is provided with cleaning chamber 11, for collecting the catalyst catalyst 3 and catalytic reaction products that are scattered, is convenient to timely cleaning.Waste gas introducing port 11 is located at the bottom of catalytic decomposition device, and outlet port 7 is located at the top of catalytic decomposition device.Shell is provided with observation window 4, for observing the situation of high concentration nitrous oxides exhaust gas catalytic decomposition.
Add the catalyst catalyst activity iron of 1.5kg at catalyst bed, start electric heater unit, design temperature is 900 DEG C, keeps after making it reach design temperature.Get the dense HNO of 1000ml
3(68%) and excessive red copper reaction, when reaction is carried out, the nitrous oxides exhaust gas of generation, passing into waste gas introducing port by ingress pipe, can seeing by importing the brownish red gas entered from observation window, after catalyst bed, the gas become colorless, is discharged by outlet port.
Pass through theory calculate: the dense HNO of 1000ml
3(68%) and excessive red copper reaction, average generation NO per hour
242.3L, the raw 169.2L's of 4 hours common properties, this gas through 1.5kg catalyst catalyst activity iron after touch, discharge after being broken down into nontoxic nitrogen.
Embodiment 2: its difference from Example 1 is, waste gas introducing port is located at the bottom of catalytic decomposition device, and outlet port is located at the top of catalytic decomposition device.Add the catalyst catalyst coke of 1kg at its catalyst bed, start electric heater unit, design temperature is 1000 DEG C, keeps after making it reach design temperature.Get the dense HNO of 1000ml
3(68%) and excessive red copper reaction, when reaction is carried out, the nitrous oxides exhaust gas of generation, passing into waste gas introducing port by ingress pipe, can seeing by importing the brownish red gas entered from observation window, after catalyst bed, the gas become colorless, is discharged by outlet port.
Pass through theory calculate: the dense HNO of 1000ml
3(68%) and excessive red copper reaction, average generation NO per hour
242.3L, the raw 169.2L's of 4 hours common properties, this gas, through the coke of 1kg, discharges after being broken down into nontoxic nitrogen.
Embodiment 3: its difference from Example 2 is, catalyst catalyst is active carbon.Start electric heater unit, design temperature is 930 DEG C.
Embodiment 4: its difference from Example 2 is, catalyst catalyst is charcoal.Start electric heater unit, design temperature is 960 DEG C.
Embodiment 5: its difference from Example 2 is, catalyst catalyst is the mixture of active carbon, coke, charcoal.Start electric heater unit, design temperature is 980 DEG C.
In addition to the implementation, the present invention can also have other embodiments, and all employings are equal to the technical scheme that replacement or equivalent transformation are formed, within the protection domain all dropping on application claims.
Claims (7)
1. a high concentration nitrous oxides exhaust gas catalytic decomposing method, the catalytic decomposition device used comprises shell, cavity, waste gas introducing port, outlet port, also be provided with catalyst bed, heater in cavity, it is characterized in that one or more catalyst catalyst comprising the steps: to add to catalyst bed in active iron, active carbon, coke, charcoal; Catalyst catalyst is heated to 900-1000 DEG C by heater, keeps after reaching design temperature; High concentration nitrous oxides exhaust gas is passed into cavity by waste gas introducing port, and high concentration nitrogen oxide and catalyst catalyst reaction, product is discharged by outlet port.
2. high concentration nitrous oxides exhaust gas catalytic decomposing method according to claim 1, is characterized in that, heater is electric heater unit, and cavity inner wall is provided with heat-insulation layer.
3. high concentration nitrous oxides exhaust gas catalytic decomposing method according to claim 1, is characterized in that, waste gas introducing port is located at the bottom of catalytic decomposition device, and outlet port is located at the top of catalytic decomposition device.
4. high concentration nitrous oxides exhaust gas catalytic decomposing method according to claim 1, is characterized in that, waste gas introducing port is located at the bottom of catalytic decomposition device, and outlet port is located at the top of catalytic decomposition device.
5. high concentration nitrous oxides exhaust gas catalytic decomposing method according to claim 1, it is characterized in that, shell is provided with observation window.
6. high concentration nitrous oxides exhaust gas catalytic decomposing method according to claim 2, is characterized in that, the material of shell is stainless steel, and heat-insulation layer is that ceramic thermal insulation is cotton.
7. high concentration nitrous oxides exhaust gas catalytic decomposing method according to claim 1, is characterized in that, the bottom of cavity is provided with cleaning chamber.
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| CN102000504A (en) * | 2010-09-27 | 2011-04-06 | 北京科技大学 | SCR denitration device for flue gas of glass furnace |
| CN201894909U (en) * | 2010-10-20 | 2011-07-13 | 东莞市升微机电设备科技有限公司 | Volatile organic matter treatment and catalytic reaction tank |
| CN202962270U (en) * | 2012-11-28 | 2013-06-05 | 南京金美镓业有限公司 | Catalytic decomposing device for high-concentration nitric oxide waste gas |
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| JPH0910556A (en) * | 1995-06-28 | 1997-01-14 | Sakai Chem Ind Co Ltd | Removal of nitrogen oxide |
| US8061120B2 (en) * | 2007-07-30 | 2011-11-22 | Herng Shinn Hwang | Catalytic EGR oxidizer for IC engines and gas turbines |
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|---|---|---|---|---|
| CN102000504A (en) * | 2010-09-27 | 2011-04-06 | 北京科技大学 | SCR denitration device for flue gas of glass furnace |
| CN201894909U (en) * | 2010-10-20 | 2011-07-13 | 东莞市升微机电设备科技有限公司 | Volatile organic matter treatment and catalytic reaction tank |
| CN202962270U (en) * | 2012-11-28 | 2013-06-05 | 南京金美镓业有限公司 | Catalytic decomposing device for high-concentration nitric oxide waste gas |
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Effective date of registration: 20200318 Address after: Kazuo Economic Development Zone, Chaoyang City, Liaoning Province Patentee after: Chaoyang Jinmei gallium Industry Co., Ltd Address before: 211165, No. 718, general road, Jiangning Development Zone, Nanjing, Jiangsu Patentee before: NANJING JINMEI GALLIUM Ltd. |
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