CN210584481U - Wet-process ultralow-temperature flue gas denitration efficient device - Google Patents
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Abstract
A wet-process ultralow-temperature flue gas denitration high-efficiency device comprises a denitration tower, a pressurizing fan, a gas-liquid separation device, a gas distribution device, a circulation tank and a precipitation tank; a mixed-layer denitration catalytic carrier layer, a demisting device and a spraying device are arranged in the denitration tower; the flue gas sequentially passes through a pressurizing fan, a gas-liquid separation device and a gas distribution device and enters a denitration tower; the spraying device is communicated with the circulating tank through a pipeline, and a liquid catalyst and a reducing agent are arranged in the circulating tank; the settling tank is communicated with the position close to the bottom of the denitration tower and is communicated with the circulating tank through an overflow pipe; the flue gas enters the denitration tower from the gas distribution device and is discharged from the upper part of the denitration tower after sequentially passing through the mixed-layer denitration catalytic carrier layer, the spraying device and the demisting device; the method is suitable for smelting kiln conditions that the content of nitrogen oxides is high and unstable, and the components of flue gas are complex, and can realize efficient removal of nitrogen oxides under the dual action of a solid-liquid catalyst in one tower after wet desulphurization, and the method has the advantages of simple process flow and good denitration effect.
Description
Technical Field
The utility model relates to an environmental protection technology field mainly relates to smelt kiln flue gas low temperature denitration technique, and specific wet process ultra-low temperature (25-80 ℃ C. at normal temperature) flue gas denitration high efficiency (desulfurization efficiency more than 99.6%, denitration efficiency more than 95%) device that relates to.
Background
The desulfurization and denitrification problems of industrial boilers, glass kilns, metallurgical steel sintering furnaces, chemical plants and pickling equipment in the flue gas desulfurization and denitrification industry in China are difficult, and particularly the development of a flue gas desulfurization and denitrification technology which can be recycled under a low-temperature condition (above 25 ℃) on a smelting kiln is difficult; in addition, the traditional wet process has the problems of low desulfurization and denitration efficiency, difficult regeneration of the desulfurization and denitration catalyst, unstable operation, easy blockage and scaling, no utilization value of byproducts and the like.
SUMMERY OF THE UTILITY MODEL
The utility model provides a wet ultra-low temperature flue gas denitration high-efficiency device, which solves the existing ultra-low temperature denitration problem; the device and the technology are particularly suitable for smelting kiln conditions with high and unstable nitrogen oxide content and complex smoke components, the denitration device can realize efficient nitrogen oxide removal under the dual action of a solid-liquid catalyst in one tower after wet desulphurization, and has the advantages of simple process flow and good denitration effect.
In order to solve the technical problem, the utility model discloses a technical scheme be: a wet-process ultralow-temperature flue gas denitration high-efficiency device comprises a denitration tower, a pressurizing fan, a gas-liquid separation device, a gas distribution device, a circulation tank and a precipitation tank; a mixed-layer denitration catalytic carrier layer, a demisting device and a spraying device are arranged in the denitration tower; the method comprises the following steps that flue gas enters a denitration tower from a gas supply flue through a pressurizing fan, a gas-liquid separation device (a gas-liquid separator) and a gas distribution device (a gas distributor) which are sequentially communicated, wherein the gas distribution device extends into the denitration tower and is positioned at the position close to the bottom of the denitration tower; the spraying device is communicated with the circulating tank through a pipeline, and a liquid catalyst and a reducing agent are arranged in the circulating tank; the settling tank is communicated with the position close to the bottom of the denitration tower and is communicated with the circulating tank through an overflow pipe; the flue gas after the gas distribution device gets into in the denitration tower and loops through mixed layer denitration catalysis carrier layer, spray set and defogging device after discharging from the denitration tower top.
Adopt this structure, the utility model discloses produced beneficial effect is: the mixed-layer denitration catalytic carrier layer and the liquid-phase catalyst are combined, and the low-temperature wet denitration is realized by using the redox principle and the urea reaction; the method has the advantages of high denitration efficiency, good effect, no waste water and waste residue, and good environmental benefit and economic benefit. The utility model discloses an above-mentioned structure make full use of solid, the solid technology and the device that liquid combined catalyst combined together improve deNOx systems's stability and desorption efficiency greatly, eliminate original wet process deNOx systems produced secondary pollution itself, realize that denitration efficiency reaches more than 90%, make nitrogen oxide reach super clean emission, satisfy strict environmental protection requirement day by day.
Preferably, an accident groove is connected below the denitration tower and is communicated with the precipitation groove through a pipeline; by adopting the structure, when the liquid circulation volume is too large or the power failure is in emergency, a part of liquid is sent into the accident tank, and when the whole denitration system operates again, the liquid in the accident tank is used after being pumped into the precipitation tank and then being pumped into the circulation tank, so that the liquid catalyst and the reducing agent in the circulation tank are not supplied in an interruption manner, and the effective circulation of the whole system is realized.
Preferably, the mixed layer denitration catalyst carrier layer and the spraying device are respectively provided with at least two sets, the at least two sets are arranged along the height direction of the denitration tower, and the mixed layer denitration catalyst carrier layer is positioned below the mixed layer denitration catalyst carrier layer and the spraying device is positioned above the mixed layer denitration catalyst carrier layer; by adopting the structure, the flue gas can be subjected to catalytic oxidation reduction reaction by utilizing the dual functions of solid and liquid more efficiently, and the nitrogen oxide can be efficiently removed under the dual functions of the solid and liquid catalysts in one tower.
Furthermore, each mixed denitration catalytic carrier layer is at least provided with three layers of fillers, each layer of filler comprises a PP material and a 304 material corrugated carrier which are mixed, and the weight ratio of the PP material to the 304 material corrugated carrier is 3: 1. by adopting the structure, the pin removal efficiency can be fully guaranteed.
Preferably, a sedimentation tank circulating pipeline communicated with the circulating tank is arranged at the bottom of the sedimentation tank, and a filtering device is further arranged on the sedimentation tank circulating pipeline; by adopting the structure, the impurities precipitated in the precipitation tank can be pumped into the filtering device after a period of time to remove the impurities and recover, and the obtained clear liquid is sent to the circulating tank for recycling; more complete utilization and recovery.
Preferably, the circulating tank is also connected with a batching tank, and the batching tank is connected with a feeding device; by adopting the structure, when the liquid in the circulating tank can not meet the circulating requirement, the feed liquid can be supplemented in time, and the sufficient circulating and catalytic oxidation reduction effects can be realized. In addition, the efficiency of the liquid denitration agent and the reducing agent can be reduced to a certain extent after the liquid denitration agent and the reducing agent are recycled for a period of time, and in order to ensure stable and efficient removal of nitrogen oxides, the liquid denitration agent and the reducing agent are quantitatively added through a feeding device and a batching device, so that the catalytic oxidation reduction effect is ensured.
Preferably, a first stirring device is arranged in the circulating tank; the structure can optimize the effects of the liquid denitrifying agent and the reducing agent.
Preferably, a second stirring device is arranged in the batching tank; the structure can optimize the effects of the liquid denitrifying agent and the reducing agent.
The utility model discloses above-mentioned structure process flow and principle: the flue gas is subjected to pre-desulfurization, liquid drops are removed in a gas-liquid separation device by adding a fan, the gas is uniformly distributed by a gas distribution device and enters a denitration tower, a denitration agent sprayed by a denitration circulating pump and a spraying device is in countercurrent contact with the flue gas from bottom to top in a mixed-layer low-temperature denitration catalytic carrier to perform catalytic oxidation-reduction reaction, the high-efficiency removal of nitrogen oxides under the action of a solid-liquid catalyst in the tower is realized, and the flue gas is discharged after reaching the standard after being subjected to liquid drop removal by a demisting device. The liquid denitration agent and the reducing agent which pass through the denitration tower overflow to the precipitation tank from the denitration tower, impurities are removed through the precipitation tank and then overflow to the circulation tank, the liquid denitration agent and the reducing agent are pumped into the denitration tower by the denitration circulation pump for recycling, and the stirring device is arranged in the circulation tank for enabling the liquid denitration agent and the reducing agent to have the best effect. The impurities precipitated in the precipitation tank are pumped into a filtering device by a filtering pump after a period of time to remove the impurities and recover, and the clear liquid is sent to a circulating tank for recycling. The efficiency of the liquid denitration agent and the reducing agent is reduced after the liquid denitration agent and the reducing agent are recycled for a period of time, and in order to ensure stable and efficient removal of nitrogen oxides, the liquid denitration agent and the reducing agent are quantitatively added through a feeding device, a batching device and a feeding pump. The stirring device is arranged in the proportioning tank for optimizing the effects of the liquid denitrifying agent and the reducing agent. When the liquid circulation volume is too large and power failure occurs emergently, a part of liquid is sent into the accident tank, and the denitration system is pumped into the circulation tank by the accident pump to be reused when running again. NO insoluble in water in flue gas in the denitration tower is oxidized into NO2 under the action of the denitration catalyst, NO2 generates nitrous acid in aqueous solution, and a certain amount of solid industrial urea is added manually at regular time to serve as a reducing agent to generate N2 and water under the action of the solid-liquid catalyst, so that the nitrogen oxide is efficiently removed.
Liquid denitration agent be catalytic oxidation agent, the reductant is industry urea, the weight ratio between them is 1: 3.
description of the drawings:
FIG. 1 is a schematic view of the structure of the present invention.
Figure 2 is a schematic structural diagram of the mixed layer denitration catalyst carrier layer of each set of the present invention.
As shown in the figure: 1. the system comprises a pressurizing fan, 2 a gas-liquid separation device, 3 an accident tank, 4 an accident tank pump, 5 a settling tank, 6 a settling tank pump, 7 a denitration tower, 8 a mixed layer denitration catalytic carrier layer, 9 a demisting device, 10 a spraying device, 11 a denitration circulating pump, 12 a circulating tank, 13 a first stirring device, 14 a filtering device, 15 a proportioning tank pump, 16 a proportioning tank, 17 a second stirring claw device, 18 a feeding device and 19 a gas distribution device.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings, but the present invention is not limited to the following embodiments.
Without special explanation, the utility model discloses a forced draught fan, gas-liquid separation device, gas distribution device, spray set (defroster) and defogging device are the commercial product that chemical industry is commonly used. The utility model discloses for the better flow of medium on each pipeline, all be provided with the pump, for the circulation of medium provides power, the pump is also the conventional pump of trade, has defined different names according to the difference with each spare part of being connected to do not influence the result of use of pump.
As shown in the attached drawing 1, the utility model relates to a wet-process ultralow-temperature flue gas denitration high-efficiency device, which comprises a denitration tower 7, a pressurizing fan 1, a gas-liquid separation device 2, a gas distribution device 19, a circulation tank 12 and a precipitation tank 5; a mixed denitration catalytic carrier layer 8, a demisting device 9 and a spraying device 10 are arranged in the denitration tower; flue gas enters the denitration tower from the gas supply flue through a pressurizing fan, a gas-liquid separation device (a gas-liquid separator) and a gas distribution device (a gas distributor) which are sequentially communicated (communicated through a pipeline), wherein the gas distribution device extends into the denitration tower and is positioned at the position close to the bottom of the denitration tower; the spraying device is communicated with a circulating tank 12 through a pipeline, and a liquid catalyst and a reducing agent are arranged in the circulating tank 12; the settling tank is communicated with the position close to the bottom of the denitration tower and is communicated with the circulating tank through an overflow pipe; the flue gas enters the denitration tower from the gas distribution device and sequentially passes through the mixed-layer denitration catalytic carrier layer 8, the spraying device 10 and the demisting device 9, and then is discharged from the upper part of the denitration tower 7.
Adopt this structure, the utility model discloses produced beneficial effect is: the mixed-layer denitration catalytic carrier layer and the liquid-phase catalyst are combined, and the low-temperature wet denitration is realized by using the redox principle and the urea reaction; the method has the advantages of high denitration efficiency, good effect, no waste water and waste residue, and good environmental benefit and economic benefit. The utility model discloses an above-mentioned structure make full use of solid, the solid technology and the device that liquid combined catalyst combined together improve deNOx systems's stability and desorption efficiency greatly, eliminate original wet process deNOx systems produced secondary pollution itself, realize that denitration efficiency reaches more than 90%, make nitrogen oxide reach super clean emission, satisfy strict environmental protection requirement day by day.
As shown in the attached drawing 1, an accident tank 3 is connected below the denitration tower 7, the accident tank is communicated with the precipitation tank through a pipeline, and an accident tank pump 4 is arranged on the mutually communicated pipeline and used for providing power for substances in the accident tank to reach the precipitation tank; by adopting the structure, when the liquid circulation volume is too large or the power failure is in emergency, a part of liquid is sent into the accident tank, and when the whole denitration system operates again, the liquid in the accident tank is used after being pumped into the precipitation tank and then being pumped into the circulation tank, so that the liquid catalyst and the reducing agent in the circulation tank are not supplied in an interruption manner, and the effective circulation of the whole system is realized.
As shown in figure 1: the mixed layer denitration catalyst carrier layer 8 and the spraying device 10 are respectively provided with at least two sets, the at least two sets are arranged along the height direction of the denitration tower, and the mixed layer denitration catalyst carrier layer is positioned below the mixed layer denitration catalyst carrier layer and the spraying device is positioned above the mixed layer denitration catalyst carrier layer; by adopting the structure, the flue gas can be subjected to catalytic oxidation reduction reaction by utilizing the dual functions of solid and liquid more efficiently, and the nitrogen oxide can be efficiently removed under the dual functions of the solid and liquid catalysts in one tower. Two sets are provided in this embodiment. As shown in fig. 2: each mixed denitration catalytic carrier layer 8 is at least provided with three layers of fillers, each layer of filler comprises PP materials and 304 material corrugated carriers which are mixed, and the weight ratio of the PP materials to the 304 material corrugated carriers is 3: 1. by adopting the structure, the pin removal efficiency can be fully guaranteed.
As shown in fig. 1, a circulation pipeline of the settling tank, which is communicated with the circulation tank, is arranged at the bottom of the settling tank 5, a pump 6 of the settling tank is also arranged on the circulation pipeline to provide power for conveying media in the pipeline, and a filtering device is also arranged on the circulation pipeline of the settling tank (it can be seen that the filtering device for filtering out solid particles in the circulation medium can be applied to the utility model, such as a commercially available filter with a stainless steel filter screen); by adopting the structure, the impurities precipitated in the precipitation tank can be pumped into a filtering device after a period of time to remove the impurities and recover, and the obtained clear liquid is sent into the circulating tank 12 for recycling; more complete utilization and recovery.
As shown in fig. 1, a batching tank 16 is connected to the circulating tank 12, and a feeding device (feeding tank) 18 is connected to the batching tank; are communicated through a pipeline; in position, the feeding device is higher than the batching tank, so that feed liquid can conveniently enter the batching tank, and a valve is arranged on a pipeline communicated with the feeding device and the batching tank to control the opening and closing of the pipeline; by adopting the structure, when the liquid in the circulating tank can not meet the circulating requirement, the feed liquid can be supplemented in time, and the sufficient circulating and catalytic oxidation reduction effects can be realized. In addition, the efficiency of the liquid denitration agent and the reducing agent can be reduced to a certain extent after the liquid denitration agent and the reducing agent are recycled for a period of time, and in order to ensure stable and efficient removal of nitrogen oxides, the liquid denitration agent and the reducing agent are quantitatively added through a feeding device and a batching device, so that the catalytic oxidation reduction effect is ensured.
As shown in figure 1: a first stirring device 13 is arranged in the circulating tank 12; the structure can optimize the effects of the liquid denitrifying agent and the reducing agent.
As shown in figure 1: a second stirring device 17 is arranged in the batching tank 16; the structure can optimize the effects of the liquid denitrifying agent and the reducing agent.
The utility model also provides an utilize the denitration method of above-mentioned wet process ultra-low temperature flue gas denitration high-efficient device, concrete step includes:
(1) firstly, removing liquid drops in a gas-liquid separation device by adding a fan after flue gas is subjected to pre-desulfurization, enabling the gas to be uniformly distributed through a gas distribution device and then entering a denitration tower, enabling a mixed denitration catalyst carrier layer and a denitration agent sprayed by a spraying device to be in countercurrent contact with the flue gas from bottom to top to perform catalytic oxidation-reduction reaction, removing nitric oxide in the tower under the action of a solid-liquid catalyst, and discharging the flue gas after the flue gas reaches the standard after the liquid drops are removed through a demisting device;
(2) the liquid denitration agent and the reducing agent which pass through the denitration tower overflow to a precipitation tank from the denitration tower, impurities are removed through the precipitation tank and then overflow to a circulation tank, and the liquid denitration agent and the reducing agent in the circulation tank are pumped into the denitration tower for recycling;
(3) and (4) pumping the impurities precipitated in the precipitation tank into a filtering device after a period of time to remove impurities and recover, and delivering the clear liquid to a circulating tank for recycling.
The utility model discloses a liquid denitration agent and reductant cycle use efficiency decline after a period, for guaranteeing stable high-efficient desorption nitrogen oxide, add liquid denitration agent and reductant through dosing unit and charge pump ration. The stirring device is arranged in the proportioning tank for optimizing the effects of the liquid denitrifying agent and the reducing agent.
Denitration tower 7's below intercommunication have accident groove 3, when the liquid circulation volume is too big and have a power failure emergency, accident groove is sent into to some liquid, and the circulation groove is squeezed into by the accident pump when the deNOx systems moves again and is reused.
NO insoluble in water in the flue gas in the denitration tower is oxidized into NO under the action of the denitration catalyst2And NO2Nitrous acid generated in aqueous solution and solid industrial urea used as reducing agent to generate N under the action of solid-liquid catalyst2And water, thereby achieving the purpose of efficiently removing the nitrogen oxide.
The utility model discloses above-mentioned structure process flow and principle: the flue gas is subjected to pre-desulfurization, liquid drops are removed in a gas-liquid separation device by adding a fan, the gas is uniformly distributed by a gas distribution device and enters a denitration tower, a denitration agent sprayed by a denitration circulating pump and a spraying device is in countercurrent contact with the flue gas from bottom to top in a mixed-layer low-temperature denitration catalytic carrier to perform catalytic oxidation-reduction reaction, the high-efficiency removal of nitrogen oxides under the action of a solid-liquid catalyst in the tower is realized, and the flue gas is discharged after reaching the standard after being subjected to liquid drop removal by a demisting device. The liquid denitration agent and the reducing agent which pass through the denitration tower overflow to the precipitation tank from the denitration tower, impurities are removed through the precipitation tank and then overflow to the circulation tank, the liquid denitration agent and the reducing agent are pumped into the denitration tower by the denitration circulation pump for recycling, and the stirring device is arranged in the circulation tank for enabling the liquid denitration agent and the reducing agent to have the best effect. The impurities precipitated in the precipitation tank are pumped into a filtering device by a filtering pump after a period of time to remove the impurities and recover, and the clear liquid is sent to a circulating tank for recycling. The efficiency of the liquid denitration agent and the reducing agent is reduced after the liquid denitration agent and the reducing agent are recycled for a period of time, and in order to ensure stable and efficient removal of nitrogen oxides, the liquid denitration agent and the reducing agent are quantitatively added through a feeding device, a batching device and a feeding pump. The stirring device is arranged in the proportioning tank for optimizing the effects of the liquid denitrifying agent and the reducing agent. When the liquid circulation volume is too large and power failure occurs emergently, a part of liquid is sent into the accident tank, and the denitration system is pumped into the circulation tank by the accident pump to be reused when running again. NO insoluble in water in flue gas in the denitration tower is oxidized into NO2 under the action of the denitration catalyst, and NO2 generates nitrous acid in aqueous solution and solid industrial urea is used as a reducing agent to generate N2 and water under the action of the solid-liquid catalyst, so that the high-efficiency removal of nitrogen oxides is achieved.
Liquid denitration agent be catalytic oxidation agent, the reductant is industry urea, the weight ratio between them is 1: 3.
example 1
Utilize on XXX copper smelting enterprise denitration device the utility model discloses technology and device carry out practical application, adopt solid-state low temperature to mix layer catalyst carrier and liquid phase catalyst and combine together, catalyst carrier load 60m3The concentration of the catalyst in the solution is 6 percent, the pH value is controlled to be 8-9, the temperature of the flue gas is 40-50 ℃, and the liquid-gas-liquid ratio is 4-6L/Nm3. Flue gas parameters: flow rate 50000Nm3NOx content 600-3000mg/Nm3，SO2The content is less than or equal to 30mg/Nm3(front desulfurization system). After cyclic catalytic oxidation reduction, the detected value SO in the flue gas discharged from the tower2The average content is 0mg/Nm3The average NOx content was 40.7mg/Nm3The desulfurization efficiency is more than 99.6 percent, and the denitration efficiency is more than 95 percent.
Example 2
Utilize on XXX glass manufacturing enterprise a denitrification facility the utility model discloses technology and device carry out practical application, adopt solid-state low temperature to mix layer catalyst carrier and liquid phase catalyst and combine together, and catalyst carrier load capacity 40m3The concentration of the catalyst in the solution is 6%, the pH value is controlled to be 8-9, the temperature of the flue gas is 50-60 ℃, and the liquid-gas ratio is 4-6L/Nm 3. Flue gas parameters: the flow rate is 30000Nm3/h, the NOx content is 600-1600mg/Nm3, and SO2The content is less than or equal to 30mg/Nm3 (front desulfurization system). After cyclic catalytic oxidation reduction, the flue gas is discharged from the towerDetected value SO2The average content was 0mg/Nm3, and the average NOx content was 29.7mg/Nm3The desulfurization efficiency is more than 99.6 percent, and the denitration efficiency is more than 95 percent.
According to the embodiment, the set of the denitration device can effectively desulfurize and treat NOx, and the effect is obvious.
Claims (8)
1. The utility model provides a wet process ultra-low temperature flue gas denitration high-efficient device which characterized in that: the device comprises a denitration tower, a pressurizing fan, a gas-liquid separation device, a gas distribution device, a circulation tank and a precipitation tank; a mixed-layer denitration catalytic carrier layer, a demisting device and a spraying device are arranged in the denitration tower; the flue gas enters the denitration tower from the gas supply flue through a pressurizing fan, a gas-liquid separation device and a gas distribution device which are sequentially communicated, and the gas distribution device extends into the denitration tower and is positioned at the position close to the bottom of the denitration tower; the spraying device is communicated with the circulating tank through a pipeline, and a liquid catalyst and a reducing agent are arranged in the circulating tank; the settling tank is communicated with the position close to the bottom of the denitration tower and is communicated with the circulating tank through an overflow pipe; the flue gas after the gas distribution device gets into in the denitration tower and loops through mixed layer denitration catalysis carrier layer, spray set and defogging device after discharging from the denitration tower top.
2. The wet ultra-low temperature flue gas denitration high-efficiency device as claimed in claim 1, characterized in that: and an accident groove is also connected below the denitration tower and is communicated with the precipitation tank through a pipeline.
3. The wet ultra-low temperature flue gas denitration high-efficiency device as claimed in claim 1, characterized in that: mix layer denitration catalysis carrier layer and spray set all set up two sets at least, and two sets at least all will set up along the direction of height of denitration tower, mix in each set and mix layer denitration catalysis carrier layer and be located the below, spray set is located the top.
4. The wet ultra-low temperature flue gas denitration high-efficiency device as claimed in claim 3, characterized in that: the mixed layer denitration catalytic carrier layer is at least provided with three layers of fillers, each layer of filler comprises PP material and 304 material corrugated carrier, and the weight ratio of the PP material to the 304 material corrugated carrier is 3: 1.
5. the wet ultra-low temperature flue gas denitration high-efficiency device as claimed in claim 1, characterized in that: the bottom of the settling tank is provided with a settling tank circulating pipeline communicated with the circulating tank, and the settling tank circulating pipeline is also provided with a filtering device.
6. The wet ultra-low temperature flue gas denitration high-efficiency device as claimed in claim 1, characterized in that: the circulation tank still be connected with the proportioning bins, the proportioning bins be connected with feeding device.
7. The wet ultra-low temperature flue gas denitration high-efficiency device as claimed in claim 6, characterized in that: and a second stirring device is arranged in the batching tank.
8. The wet ultra-low temperature flue gas denitration high-efficiency device as claimed in claim 1, characterized in that: and a first stirring device is arranged in the circulating tank.
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| CN110252136A (en) * | 2019-07-09 | 2019-09-20 | 江西同兴环保工程技术有限公司 | The ultralow temperature smoke denitrating high-performance device of wet process and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110252136A (en) * | 2019-07-09 | 2019-09-20 | 江西同兴环保工程技术有限公司 | The ultralow temperature smoke denitrating high-performance device of wet process and method |
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