CN210544339U - Nitrogen oxide tail gas treatment system - Google Patents
Nitrogen oxide tail gas treatment system Download PDFInfo
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- CN210544339U CN210544339U CN201921321482.5U CN201921321482U CN210544339U CN 210544339 U CN210544339 U CN 210544339U CN 201921321482 U CN201921321482 U CN 201921321482U CN 210544339 U CN210544339 U CN 210544339U
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Abstract
The utility model relates to a nitrogen oxide tail gas treatment system, including the one-level scrubbing tower, second grade scrubbing tower, tertiary scrubbing tower, level four scrubbing tower, five-level scrubbing tower and the draught fan that connect gradually, all include spray set, liquid collecting tank, circulating pump and washing mechanism in the scrubbing tower, spray set includes shower, filler and the whirl board that sets up from top to bottom, be connected through the circulating pump between liquid collecting tank and the shower, liquid collecting tank is equipped with cooling coil and the filter that sets up of slope, washing mechanism includes the flushing pipe that sets up below filler, drive motor, high-pressure flushing pump and the washing water tank of drive flushing pipe pivoted; the spray liquid in the first-stage washing tower and the second-stage washing tower is water, the spray liquid in the third-stage washing tower and the fourth-stage washing tower is alkaline solution, and the spray liquid in the fifth-stage washing tower is oxidant solution. The utility model has the advantages of ability backwash filler, good and long-term steady operation of tail gas treatment effect.
Description
Technical Field
The utility model relates to a tail gas treatment technical field, more specifically say, relate to a nitrogen oxide tail gas treatment system.
Background
The tail gas that contains nitrogen oxide that produces in industrial production, its principal ingredients are nitric oxide, nitrogen dioxide, and nitrogen oxide all has the toxicity of different degrees, can the contaminated air, so can handle the emission again to tail gas that contains nitrogen oxide, through using single-stage spray column to spray alkaline solution, the treatment effect is not good like this, leads to the tail gas to handle not up to standard easily, and the back is used for a long time to the filler in the spray column, mostly has solid particle to hide among them in the filler, influences the effect of filler.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the problem that a nitrogen oxide tail gas treatment system is provided, spray the scrubbing tower of liquid through multistage difference and spray, improve tail gas treatment effect, can the backwash filler, washing effect is good, can long-term steady operation.
The utility model provides a nitrogen oxide tail gas treatment system, which comprises a first-stage washing tower, a second-stage washing tower, a third-stage washing tower, a fourth-stage washing tower, a fifth-stage washing tower and a draught fan, wherein the first-stage washing tower, the second-stage washing tower, the third-stage washing tower, the fourth-stage washing tower and the fifth-stage washing tower respectively comprise a spraying part arranged in the towers, a liquid collecting box arranged at the bottom of the towers, a circulating pump arranged outside the towers and a flushing mechanism,
the spraying part comprises a spraying pipe, a filler and a rotational flow plate which are arranged from top to bottom, the spraying pipe is provided with a plurality of spraying heads which are arranged in a downward spraying manner, the liquid collecting tank is connected with the spraying pipe through the circulating pump, the bottom of the liquid collecting tank is provided with a filter plate which is arranged in an inclined manner, the liquid inlet of the circulating pump is connected with the bottom of the liquid collecting tank and is positioned below the filter plate, the liquid outlet of the circulating pump is connected with the spraying pipe through a liquid return pipe, the liquid collecting tank is internally provided with a cooling coil which is positioned above the filter plate, the cooling coil is coiled on the periphery of the liquid return pipe, the flushing mechanism comprises a flushing pipe arranged below the filler, a driving motor for driving the flushing pipe to rotate, a high-pressure flushing pump and a cleaning water tank, and the flushing pipe is provided with a plurality of flushing nozzles which are arranged in an, the water inlet end of the high-pressure flushing pump is connected with the cleaning water tank, the water outlet end of the high-pressure flushing pump is provided with a water delivery pipe, a communicating pipe of the flushing pipe is communicated with the water delivery pipe through a rotating connecting pipe, the communicating pipe is rotationally connected with the rotating connecting pipe, a driving shaft of the driving motor is rotationally connected with the rotating connecting pipe and is fixedly connected with the communicating pipe, and the side wall of the communicating pipe is provided with a water inlet through hole;
the bottom of the first-stage washing tower is provided with an air inlet pipe, the top of the first-stage washing tower is hermetically communicated with the top of the second-stage washing tower through a pipeline, the bottom of the second-stage washing tower is hermetically communicated with the bottom of the third-stage washing tower through a pipeline, the top of the third-stage washing tower is hermetically communicated with the top of the fourth-stage washing tower through a pipeline, the bottom of the fourth-stage washing tower is hermetically communicated with the bottom of the fifth-stage washing tower through a pipeline, the top of the fifth-stage washing tower is connected with an air outlet pipe, the air outlet pipe is connected with an air inlet of the induced draft fan, and an; the liquid collecting box of the first-stage washing tower, the second-stage washing tower, the third-stage washing tower, the fourth-stage washing tower and the fifth-stage washing tower is internally provided with spray liquid, the spray liquid in the first-stage washing tower and the spray liquid in the second-stage washing tower are both water, the spray liquid in the third-stage washing tower and the spray liquid in the fourth-stage washing tower are both alkaline solution, and the spray liquid in the fifth-stage washing tower is oxidant solution.
As an optimal scheme of the utility model, still include the buffer tank, the buffer tank is equipped with air inlet and tail gas air inlet, the air inlet of one-level scrubbing tower with the gas outlet of buffer tank is connected.
As a preferable aspect of the present invention, the cooling coil is formed by winding a corrugated cooling pipe.
As the preferred scheme of the utility model, the top of five-stage washing tower is equipped with the defogging layer.
As a preferred embodiment of the present invention, the flushing mechanism is provided below the defogging layer.
As an optimal scheme of the utility model, still include vibrating motor, vibrating motor's output with the defogging layer is connected, the outer wall on defogging layer with be equipped with the elastic connection pole between the inner wall of five-level scrubbing tower.
As an optimal scheme of the utility model, defogging layer is including setting gradually first mesh board, multiaspect hollow sphere layer and second mesh board.
As the preferred scheme of the utility model, the tower wall of one-level scrubbing tower, second grade scrubbing tower, tertiary scrubbing tower, level four scrubbing tower, five-level scrubbing tower all is equipped with transparent observation window.
In a preferred embodiment of the present invention, the alkaline solution is a sodium hydroxide solution.
As a preferred embodiment of the present invention, the oxidant solution is sodium percarbonate.
Implement the utility model discloses a nitrogen oxide tail gas processing system compares with prior art, has following beneficial effect:
the utility model can improve the absorption rate of the tail gas and make the tail gas absorption effect better by treating and absorbing the tail gas containing nitrogen oxides by the five-stage washing tower, can prolong the flow path of the tail gas and improve the contact area of the tail gas and the spray liquid by the cyclone plate, and can cool the spray liquid by arranging the cooling coil pipe in the liquid collection box, thereby avoiding the influence of the overhigh temperature of the spray liquid on the tail gas treatment; solid particles in the spraying liquid can be isolated on the filter plate through the filter plate which is obliquely arranged in the liquid collecting box, and the liquid inlet of the circulating pump is connected with the bottom of the liquid collecting box and is positioned below the filter plate, so that the solid particles can be prevented from flowing back to block all parts, and the long-term stable operation of the treatment system is ensured; in addition, the flushing pipe below the filler can be regularly used for reversely flushing the filler, hidden solid impurities in the filler are removed, the using effect of the filler is guaranteed, the flushing pipe is rotated by the driving motor, and the flushing nozzle on the flushing pipe can be guaranteed to flush the filler without dead angles.
Drawings
In order to more clearly illustrate the technical solution of the embodiments of the present invention, the drawings of the embodiments will be briefly described below.
Fig. 1 is a schematic structural diagram of a nitrogen oxide tail gas treatment system provided by the present invention;
FIG. 2 is a schematic structural view of the flushing mechanism;
wherein, 1 is a first-stage washing tower; 2 is a secondary washing tower; 3 is a three-stage washing tower; 4 is a four-stage washing tower; 5 is a five-stage washing tower; 6 is a draught fan; 7 is a buffer tank; 11 is a spray pipe; 12 is a filler; 13 is a rotational flow plate; 14 is a circulating pump; 15 is a liquid collecting tank; 151 is a filter plate; 152 is a cooling coil; 16 is a flushing pipe; 161 is a rotary connecting pipe; 162 is a communicating pipe; 17 is a driving motor; 18 is a high pressure flush pump; 19 is a cleaning water tank; 191 is a water pipe; 10 is a transparent observation window; 51, a demisting layer; 511 is an elastic connecting rod; 52 is a vibration motor; 61 is an air outlet pipe; 71 is an air inlet; and 72 is an exhaust gas inlet.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
As shown in fig. 1 and fig. 2, the preferred embodiment of the present invention comprises a first-stage washing tower 1, a second-stage washing tower 2, a third-stage washing tower 3, a fourth-stage washing tower 4, a fifth-stage washing tower 5 and a draught fan 6, wherein the first-stage washing tower 1, the second-stage washing tower 2, the third-stage washing tower 3, the fourth-stage washing tower 4 and the fifth-stage washing tower 5 each comprise a spraying part arranged in the tower, a liquid collecting tank 15 arranged at the bottom of the tower, a circulating pump 14 arranged outside the tower and a flushing mechanism, the spraying part comprises a spraying pipe 11, a filler 12 and a cyclone plate 13 arranged from top to bottom, the spraying pipe 11 is provided with a plurality of spraying heads arranged in a downward spraying manner, the liquid collecting tank 15 is connected with the spraying pipe 11 through the circulating pump 14, the bottom of the liquid collecting tank 15 is provided with a filter plate 151 arranged in an inclined manner, and the liquid collecting tank 15 is provided with a slag discharge outlet, a liquid inlet of the circulating pump 14 is connected with the bottom of the liquid collecting tank 15 and is positioned below the filter plate 151, a liquid outlet of the circulating pump 14 is connected with the spray pipe 11 through a liquid return pipe, a cooling coil 152 is arranged in the liquid collecting tank 15, the cooling coil 152 is connected with an external cooling tower, the cooling coil 152 is positioned above the filter plate 151, the cooling coil 152 is wound on the periphery of the liquid return pipe, the flushing mechanism comprises a flushing pipe 16 arranged below the filler 12, a driving motor 17 for driving the flushing pipe 16 to rotate, a high-pressure flushing pump 18 and a cleaning water tank 19, a plurality of flushing nozzles for flushing upwards are arranged on the flushing pipe 16, a water inlet end of the high-pressure flushing pump 18 is connected with the cleaning water tank 19, a water conveying pipe 191 is arranged at a water outlet end of the high-pressure flushing pump 18, and a communicating pipe 162 of the flushing pipe 16 is communicated with the water conveying pipe 191 through a rotating connecting pipe 161, the connection pipe 162 is rotatably connected to the rotation connection pipe 161, the driving shaft of the driving motor 17 is rotatably connected to the rotation connection pipe 161 and is fixedly connected to the connection pipe 162, a water inlet through hole is formed in the side wall of the communicating pipe 162, an air inlet pipe is arranged at the bottom of the first-stage washing tower 1, the top of the first-stage washing tower 1 is hermetically communicated with the top of the second-stage washing tower 2 through a pipeline, the bottom of the second-stage washing tower 2 is hermetically communicated with the bottom of the third-stage washing tower 3 through a pipeline, the top of the third-stage washing tower 3 is hermetically communicated with the top of the fourth-stage washing tower 4 through a pipeline, the bottom of the fourth-stage washing tower 4 is hermetically communicated with the bottom of the fifth-stage washing tower 5 through a pipeline, the top of the five-stage washing tower 5 is connected with an air outlet pipe 61, the air outlet pipe 61 is connected with an air inlet of the induced draft fan 6, and an air outlet of the induced draft fan 6 is connected with an exhaust pipe; spray liquid is arranged in the liquid collecting tank 15 of the first-stage washing tower 1, the second-stage washing tower 2, the third-stage washing tower 3, the fourth-stage washing tower 4 and the fifth-stage washing tower 5, the spray liquid in the first-stage washing tower 1 and the second-stage washing tower 2 is water, the spray liquid in the third-stage washing tower 3 and the fourth-stage washing tower 4 is alkaline solution, and the spray liquid in the fifth-stage washing tower 5 is oxidant solution; among them, the alkaline solution is preferably a sodium hydroxide solution.
It should be noted that the treatment principle of each stage of the washing tower is as follows:
1. in the first-stage washing tower 1, the water-soluble components in the nitrogen oxides are dissolved in water to generate nitric acid, and oxygen in the air reacts with NO to be converted into NO which is easily dissolved in water2，
Reaction equation 1: 3NO2+H2O＝2HNO3+NO
Reaction equation 2: 2NO + O2＝2NO2
2. In the second-stage washing tower 2, the water-soluble components in the nitrogen oxides are continuously dissolved in water to generate nitric acid, and oxygen in the air reacts with NO to be converted into NO which is easily dissolved in water2，
Continuously dissolving the water-soluble components in the nitrogen oxide in water to generate nitric acid
Reaction equation 1: 3NO2+H2O＝2HNO3+NO
Reaction equation 2: 2NO + O2＝2NO2
3. In the three-stage washing column 3, NO remains2By an alkaline solution absorption reaction treatment
The reaction equation is as follows:
2NO2+2NaOH＝NaNO2+NaNO3+H2O
3NO2+H2O＝2HNO3+NO
HNO3+NaOH＝NaNO3+H2O
4. in the four-stage scrubber 4, NO remains2By an alkaline solution absorption reaction treatment
The reaction equation is as follows:
2NO2+2NaOH＝NaNO2+NaNO3+H2O
3NO2+H2O＝2HNO3+NO
HNO3+NaOH＝NaNO3+H2O
5. in the fifth-stage scrubber 5, final strengthening treatment is performed.
Wherein, the oxidant solution is at least one of sodium perchlorate, sodium chlorate, sodium chlorite, sodium percarbonate and sodium persulfate, and the oxidant solution is preferably sodium percarbonate.
Therefore, the utility model discloses a five-stage washing tower 5 is handled and is absorbed the tail gas that contains nitrogen oxide, can improve the absorption rate of tail gas and make the tail gas absorption effect better, can prolong the flow path of tail gas and improve tail gas and spray liquid area of contact through whirl board 13 to set up cooling coil 152 and can make the spray liquid cool down in liquid collecting tank 15, avoid the too high tail gas processing that influences of spray liquid temperature; solid particles in the spray liquid can be isolated on the filter plate 151 through the filter plate 151 which is obliquely arranged in the liquid collection box 15, and a liquid inlet of the circulating pump 14 is connected with the bottom of the liquid collection box 15 and is positioned below the filter plate 151, so that the blockage of each part due to the backflow of the solid particles can be avoided, and the long-term stable operation of the treatment system is ensured; in addition, the washing pipe 16 positioned below the filler 12 can regularly perform back washing on the filler 12, remove hidden solid impurities in the filler 12, ensure the using effect of the filler 12, realize the rotation of the washing pipe 16 through the driving motor 17, and ensure that a washing nozzle on the washing pipe 16 can perform washing on the filler 12 without dead angles.
Exemplarily, the first-stage washing tower 1, the second-stage washing tower 2, the third-stage washing tower 3, the fourth-stage washing tower 4 and the fifth-stage washing tower 5 are all provided with a plurality of spraying parts, and the rotating directions of blades of two adjacent rotational flow plates 13 are opposite, so that the flow path of the tail gas is further prolonged, the contact area between the tail gas and the spraying liquid is increased, and the tail gas treatment effect is improved; the rotational flow plate 13 comprises an outer frame, blades and an inner frame, the blades are connected between the inner wall of the outer frame and the outer wall of the inner frame, the inner frame is positioned above the outer frame, the blades are obliquely arranged from bottom to top, and the spray liquid attached to the blades can flow to the outer frame and flow to the inner wall of the washing tower; in order to avoid that the tail gas directly passes through the inner frame, the inner frame is provided with an inner plate.
Exemplarily, the nitrogen oxide tail gas treatment system further comprises a buffer tank 7, the buffer tank 7 is provided with an air inlet 71 and a tail gas inlet 72, the air inlet of the primary washing tower 1 is connected with the air outlet of the buffer tank 7, the buffer tank 7 is filled with the tail gas and the air according to a certain proportion, the pretreatment is carried out in the buffer tank 7, and the air provides oxygen O2Converting NO in the tail gas into NO which is easily dissolved in water2(ii) a The reaction equation is as follows: 2NO + O2＝2NO2。
Illustratively, the cooling coil 152 is formed by winding a cooling pipe in a corrugated shape, so that the contact area between the cooling coil 152 and the spray liquid is increased, and the heat exchange speed is increased.
Illustratively, the top of the five-stage washing tower 5 is provided with a demisting layer 51, the demisting layer 51 comprises a first mesh plate, a polyhedral hollow sphere layer and a second mesh plate which are sequentially arranged, and the water content of the exhaust gas can be reduced through the demisting layer 51.
For example, the flushing mechanism is arranged below the defogging layer 51, so that the defogging layer 51 can be regularly and reversely flushed, hidden solid impurities in the defogging layer 51 can be removed, and the defogging effect of the defogging layer can be ensured.
For example, a vibration motor 52 is arranged on the defogging layer 51, an output end of the vibration motor 52 is connected with the defogging layer 51, and an elastic connecting rod 511 is arranged between an outer wall of the defogging layer 51 and an inner wall of the five-stage washing tower 5, so that solid impurities and retained liquid drops hidden in the defogging layer 51 can be vibrated down, and the defogging effect of the defogging layer 51 is ensured.
Exemplarily, the tower walls of the first-level washing tower 1, the second-level washing tower 2, the third-level washing tower 3, the fourth-level washing tower 4 and the fifth-level washing tower 5 are all provided with transparent observation windows 10, the internal conditions of the washing towers can be observed at any time through the observation windows, the tower walls of the first-level washing tower 1, the second-level washing tower 2, the third-level washing tower 3, the fourth-level washing tower 4 and the fifth-level washing tower 5 are also provided with maintenance doors, and when the washing towers are maintained, the maintenance doors can be directly opened to maintain, so that the operation of maintenance personnel is facilitated.
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the scope of the invention, therefore, the invention is not limited thereto.
Claims (10)
1. A nitric oxide tail gas treatment system is characterized by comprising a first-stage washing tower, a second-stage washing tower, a third-stage washing tower, a fourth-stage washing tower, a fifth-stage washing tower and a draught fan, wherein the first-stage washing tower, the second-stage washing tower, the third-stage washing tower, the fourth-stage washing tower and the fifth-stage washing tower respectively comprise a spraying part arranged in the towers, a liquid collecting box arranged at the bottom of the towers, a circulating pump arranged outside the towers and a flushing mechanism,
the spraying part comprises a spraying pipe, a filler and a rotational flow plate which are arranged from top to bottom, the spraying pipe is provided with a plurality of spraying heads which are arranged in a downward spraying manner, the liquid collecting box is connected with the spraying pipe through the circulating pump, the bottom of the liquid collecting box is provided with a filter plate which is arranged obliquely, the liquid inlet of the circulating pump is connected with the bottom of the liquid collecting box and is positioned below the filter plate, the liquid outlet of the circulating pump is connected with the spraying pipe through a liquid return pipe, a cooling coil pipe is arranged in the liquid collecting box and is positioned above the filter plate, and the cooling coil pipe is coiled on the periphery of the liquid return pipe,
the flushing mechanism comprises a flushing pipe arranged below the filler, a driving motor for driving the flushing pipe to rotate, a high-pressure flushing pump and a cleaning water tank, wherein a plurality of flushing nozzles which are upwards flushed are arranged on the flushing pipe, the water inlet end of the high-pressure flushing pump is connected with the cleaning water tank, the water outlet end of the high-pressure flushing pump is provided with a water conveying pipe, a communicating pipe of the flushing pipe is communicated with the water conveying pipe through a rotating connecting pipe, the communicating pipe is rotatably connected with the rotating connecting pipe, a driving shaft of the driving motor is rotatably connected with the rotating connecting pipe and fixedly connected with the communicating pipe, and the side wall of the communicating pipe is provided with a water inlet through hole;
the bottom of the first-stage washing tower is provided with an air inlet pipe, the top of the first-stage washing tower is hermetically communicated with the top of the second-stage washing tower through a pipeline, the bottom of the second-stage washing tower is hermetically communicated with the bottom of the third-stage washing tower through a pipeline, the top of the third-stage washing tower is hermetically communicated with the top of the fourth-stage washing tower through a pipeline, the bottom of the fourth-stage washing tower is hermetically communicated with the bottom of the fifth-stage washing tower through a pipeline, the top of the fifth-stage washing tower is connected with an air outlet pipe, the air outlet pipe is connected with an air inlet of the induced draft fan, and an; the liquid collecting box of the first-stage washing tower, the second-stage washing tower, the third-stage washing tower, the fourth-stage washing tower and the fifth-stage washing tower is internally provided with spray liquid, the spray liquid in the first-stage washing tower and the spray liquid in the second-stage washing tower are both water, the spray liquid in the third-stage washing tower and the spray liquid in the fourth-stage washing tower are both alkaline solution, and the spray liquid in the fifth-stage washing tower is oxidant solution.
2. The nitrogen oxide tail gas treatment system of claim 1, further comprising a buffer tank, wherein the buffer tank is provided with an air inlet and a tail gas inlet, and the air inlet of the primary scrubber is connected with the air outlet of the buffer tank.
3. The nitrogen oxide exhaust gas treatment system of claim 1, wherein the cooling coil is coiled from corrugated cooling tubes.
4. The nitrogen oxide tail gas treatment system of claim 1, wherein a top of the five-stage scrubber is provided with a defogging layer.
5. The nitrogen oxide tail gas treatment system of claim 4, wherein the flushing mechanism is disposed below the demister layer.
6. The nitrogen oxide tail gas treatment system of claim 4, further comprising a vibration motor, wherein an output end of the vibration motor is connected with the demisting layer, and an elastic connecting rod is arranged between an outer wall of the demisting layer and an inner wall of the five-stage washing tower.
7. The nitrogen oxide tail gas treatment system of claim 4, wherein the demister layer comprises a first mesh plate, a polyhedral hollow sphere layer, and a second mesh plate sequentially disposed.
8. The nitrogen oxide tail gas treatment system of claim 1, wherein the tower walls of the first-stage washing tower, the second-stage washing tower, the third-stage washing tower, the fourth-stage washing tower and the fifth-stage washing tower are provided with transparent observation windows.
9. The nitrogen oxide tail gas treatment system of claim 1, wherein the basic solution is a sodium hydroxide solution.
10. The nitrogen oxide tail gas treatment system of claim 1, wherein the oxidant solution is sodium percarbonate.
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| CN201921321482.5U CN210544339U (en) | 2019-08-14 | 2019-08-14 | Nitrogen oxide tail gas treatment system |
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| CN201921321482.5U CN210544339U (en) | 2019-08-14 | 2019-08-14 | Nitrogen oxide tail gas treatment system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116966724A (en) * | 2023-09-19 | 2023-10-31 | 山西诺成制药有限公司 | Solvent circulation type efficient absorption spray tower |
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2019
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116966724A (en) * | 2023-09-19 | 2023-10-31 | 山西诺成制药有限公司 | Solvent circulation type efficient absorption spray tower |
| CN116966724B (en) * | 2023-09-19 | 2023-12-12 | 山西诺成制药有限公司 | Solvent circulation type efficient absorption spray tower |
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