CN215276612U - Acid spraying equipment for synchronously removing residual sludge thermoalkaline hydrolysis odor and recycling ammonia nitrogen - Google Patents
Acid spraying equipment for synchronously removing residual sludge thermoalkaline hydrolysis odor and recycling ammonia nitrogen Download PDFInfo
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- CN215276612U CN215276612U CN202120917805.8U CN202120917805U CN215276612U CN 215276612 U CN215276612 U CN 215276612U CN 202120917805 U CN202120917805 U CN 202120917805U CN 215276612 U CN215276612 U CN 215276612U
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Abstract
The utility model provides an acid spraying equipment for synchronously removing residual sludge thermoalkaline hydrolysis odor and recycling ammonia nitrogen. The device comprises an acid spray tower, wherein the front end of the acid spray tower is connected with a gas collecting pipe, the rear end of the acid spray tower is sequentially connected with an induced draft fan and an exhaust pipe, and the top end inside the acid spray tower is provided with a demister; a circulating water pump is arranged beside the acid spray tower; the inlet end of the circulating water pump is connected with the bottom of the acid spray tower, the outlet end of the circulating water pump is connected with a spray head of the acid spray tower through an acid spray pipe, and the bottom of the acid spray tower is provided with a water tank for controlling the water level in the acid spray tower, replenishing acid and leaving circulating water containing ammonia nitrogen. The utility model discloses both solved surplus sludge and solved the pollution problem that NH3 escaped at thermokalite solution in-process, furthest has retrieved the ammonia nitrogen again and has been used for Magnesium Ammonium Phosphate (MAP) reaction.
Description
Technical Field
The utility model belongs to the technical field of the smelly is relieved to excess sludge thermokalite, especially, relate to an acid that gets rid of excess sludge thermokalite stink and retrieve ammonia nitrogen in step and spray equipment.
Background introduction
With the acceleration of the urbanization process in China, the living standard of people is increasingly improved, and the amount of excess sludge generated by urban sewage treatment plants is also increasingly large. At present, more than 4000 million tons of excess sludge are produced in China every year, and the value is still rising continuously. Although the main modes of sludge treatment in China, such as landfill, composting, natural drying, incineration and the like, can well treat and dispose residual sludge, the method also causes the loss of partial nutrient substances in the sludge and increases the environmental pollution to different degrees.
The sludge thermokalysis technology is characterized in that a large amount of organic matters, phosphorus, nitrogen and other substances in the excess sludge are released into supernatant liquid by heating the excess sludge added with alkali, wherein part of phosphorus and nitrogen exist in the form of orthophosphate and ammonia nitrogen. By adopting an ammonium magnesium phosphate precipitation method, the high-efficiency removal of orthophosphate and ammonia nitrogen can be synchronously realized only by adding a proper amount of magnesium source into the supernatant and controlling proper pH, and the produced precipitate "struvite" is an excellent slow-release compound fertilizer. The struvite is fixed in the dehydrated mud cake, so that nitrogen and phosphorus in the sewage are recovered, and the fertilizer efficiency of the mud cake can be improved.
In the process of thermal alkaline hydrolysis, the residual sludge is in an alkaline environment, the released ammonia nitrogen can be rapidly combined with hydroxyl to form ammonia water, and the ammonia water can rapidly escape into the atmosphere in a high-temperature environment, so that irritant odor is diffused in a narrow space. Meanwhile, the escaped ammonia nitrogen causes the proportion of phosphorus and nitrogen in the residual sludge to be disordered, and a nitrogen source needs to be additionally added to synthesize MAP. Therefore, the problem of NH escaping from the excess sludge in the thermal alkaline hydrolysis process is solved3In the process of thermal alkaline hydrolysis of excess sludge, the exhaust ventilator is adoptedThe purpose of synchronously removing the thermal alkaline hydrolysis odor of the residual sludge and recycling ammonia nitrogen is realized by the way of feeding the gas into the acid spray tower.
SUMMERY OF THE UTILITY MODEL
The utility model provides an acid spraying equipment for synchronously removing residual sludge thermokalite hydrolysis odor and recovering ammonia nitrogen, which is used for solving the problem that ammonia nitrogen escapes in the thermokalite hydrolysis process and the nitrogen source is not enough in the preparation of MAP.
The technical proposal of the utility model is as follows.
An acid spray device for synchronously removing residual sludge thermoalkaline hydrolysis odor and recovering ammonia nitrogen comprises an acid spray tower, wherein the front end of the acid spray tower is connected with a gas collecting pipe, the rear end of the acid spray tower is sequentially connected with an induced draft fan and an exhaust pipe, and the top end in the acid spray tower is provided with a demister; a circulating water pump is arranged beside the acid spray tower; the inlet end of the circulating water pump is connected with the bottom of the acid spray tower, the outlet end of the circulating water pump is connected with a spray head of the acid spray tower through an acid spray pipe, and the bottom of the acid spray tower is provided with a water tank for controlling the water level in the acid spray tower, replenishing acid and leaving circulating water containing ammonia nitrogen.
Further, the gas collecting pipe comprises a gas collecting main pipe, a gas collecting branch pipe and an exhaust port, and the front end of the acid spray tower is sequentially connected with the gas collecting main pipe, the gas collecting branch pipe and the exhaust port; the exhaust port, the gas collecting branch pipe and the gas collecting main pipe are used for collecting NH released by residual sludge in the reaction kettle in the thermokalolysis process3The induced draft fan provides NH3The negative pressure power is quickly pumped to the acid spray tower, and the tail gas absorbs NH through the acid spray tower3And then discharged into the atmosphere through an exhaust pipe.
Further, the utility model discloses still include the viewing aperture, the viewing aperture sets up respectively on sour spray column. Further, the acid spraying tower is arranged at the outer upper end of the acid spraying tower.
Further, set up in the survey middle-end outward of sour spray column.
Further, the lower end of the acid spraying tower is arranged at the outer side of the acid spraying tower.
Further, the utility model discloses still include automatic water level control floater, inside automatic water level control floater was located the water tank for control water tank water level when water volume reduced in sour spray tower, the automatic water volume that supplyes in sour spray tower.
Further, the utility model discloses still include the apron, the apron sets up on the water tank.
Further, a valve is arranged on the acid spraying pipe.
Furthermore, a return pipeline is arranged on the acid spray tower, a valve is arranged on the return pipeline, ammonia nitrogen-containing water can flow back to the reaction kettle, and ammonium magnesium phosphate (MAP) reaction is participated in to recycle ammonia nitrogen.
The utility model discloses in, the acid sprays the NH in the absorption tail gas3And generating ammonia nitrogen-containing water, thereby achieving the purpose of removing the thermal alkaline hydrolysis odor of the residual sludge. The spray liquid is acidic and can absorb NH escaped from the reaction kettle3And thus reused for the preparation of MAP.
The utility model relates to a get rid of sour spraying apparatus of surplus sludge thermoalcaliysis stink and recovery ammonia nitrogen in step has that the investment is economized, area is little, easy operation, deodorization are effectual, absorb characteristics such as ammonia nitrogen ability reinforce.
Compared with the prior art, the utility model has the advantages that:
1. the induced draft fan is arranged behind the acid spray tower and can supply NH generated in the process of thermokalite hydrolysis3Providing power to quickly draw it into the acid spray tower, thereby reducing the likelihood of its escape into the air; meanwhile, the corrosivity of the waste gas treated by the acid spray tower is greatly reduced, and the service life of the fan can be prolonged.
2. The acid spray tower is provided with a water level automatic control floating ball, and when the water amount (water level) in the acid spray tower is low to a certain degree, the water level can be maintained by automatic supply.
3. The utility model discloses a two-stage acid spray tower, wherein every level acid spray tower is equipped with two-layer sour spraying system again, and each layer acid spraying system can be fully with the NH of release in the thermokalysis reation kettle3Absorption is carried out. Meanwhile, the second-stage acid spray tower absorbs NH in the first-stage acid spray tower3After saturation, the buffer function is realized to a certain extent to prevent NH3Escape to the atmosphere. In addition, a certain amount of acid is added into the acid spray tower, and the acid spray tower can be used for spraying the acidTo exert the absorption of NH by the acid spray tower to the maximum extent3And the reaction solution flows back to the reaction kettle to participate in Magnesium Ammonium Phosphate (MAP) reaction, thereby playing a vital role.
Drawings
FIG. 1 is a schematic cross-sectional view of the apparatus of the present invention;
fig. 2 is a top view of the device of the present invention.
The various components in the figure are as follows:
1. acid spray tower, 2, circulating water pump, 3, draught fan, 4, cover plate, 5, water level automatic control floater, 6, gas vent, 7, gas collection branch pipe, 8, gas collection main pipe, 9, exhaust pipe, 10, observation port, 11, defogging layer, 12, acid spray pipe, 13, shower nozzle, 14, back flow, 15, valve, 16, water tank.
Detailed Description
An acid spray device for synchronously removing residual sludge thermoalkaline hydrolysis odor and recovering ammonia nitrogen comprises an acid spray tower 1, wherein the front end of the acid spray tower is connected with a gas collecting pipe, the rear end of the acid spray tower is sequentially connected with an induced draft fan 3 and an exhaust pipe 9, and the top end in the acid spray tower is provided with a demister 11; a circulating water pump 2 is arranged beside the acid spray tower 1; the inlet end of the circulating water pump 2 is connected with the bottom of the acid spray tower, the outlet end of the circulating water pump is connected with a spray head 13 of the acid spray tower through an acid spray pipe 12, and a water tank 16 is arranged at the bottom of the acid spray tower and used for controlling the water level in the acid spray tower, replenishing acid and leaving circulating water containing ammonia nitrogen. The gas collecting pipe comprises a gas collecting main pipe 8, a gas collecting branch pipe 7 and an exhaust port 6, the front end of the acid spray tower is sequentially connected with the gas collecting main pipe 8, the gas collecting branch pipe 7 and the exhaust port 6, and as shown in fig. 2, the front end of the acid spray tower is connected with the conditioning reaction kettle B through the gas collecting main pipe 8, the gas collecting branch pipe 7 and the exhaust port 6. The equipment in this embodiment further comprises an observation port 10, wherein the observation port 10 is respectively arranged at the outer upper end, the outer middle end and the outer lower end of the acid spray tower 1.
The equipment in the embodiment also comprises an automatic water level control floating ball 5, wherein the automatic water level control floating ball 5 is positioned inside the water tank 16 and used for controlling the water level of the water tank and automatically supplementing the water quantity in the acid spraying tower when the water quantity in the acid spraying tower is reduced. The apparatus in this embodiment further comprises a cover plate 4, said cover plate 4 being arranged on the water tank 16. The acid spray pipe 12 is provided with a valve 15. And a return pipeline 14 is arranged on the acid spray tower, and a valve 15 is arranged on the return pipeline 14.
The utility model discloses in, gas vent 6 connecting reation kettle, gas collection branch pipe 7 and gas collection are responsible for 8 and are collected the NH that surplus sludge released in the thermokalolysis in-process of reation kettle3And under the negative pressure power generated by the induced draft fan 3, the collected NH is discharged3And quickly conveying to an acid spray tower.
1, absorbing the ammonia nitrogen in a form of ammonia nitrogen and recycling the ammonia nitrogen for MAP reaction. The cover plate 4 is used for observing whether the water level in the acid spray tower 1 is normal or not, and a certain amount of acid can be added through the cover plate 4 and is used for absorbing more NH escaped from the reaction kettle3. The water level automatic control floating ball 5 is used for feeding back to an automatic control panel of a central control room after ammonia nitrogen in the acid spray tower 1 flows back, and automatically replenishing water in the acid spray tower to a set volume under the condition that the circulating water pump 2 is started. The demisting layer 11 is used for separating liquid drops entrained in the gas at the top of the tower.
The working principle of the first-closing component in the embodiment is as follows:
1. draught fan
The draught fan is connected with the exhaust pipe and the gas collecting main pipe, an impeller is arranged in the draught fan, and negative pressure is generated by rotation of the impeller under the condition of electrifying, so that NH collected in the gas collecting main pipe3Can be quickly and timely sucked into the acid spray tower for absorption, thereby realizing the aim of deodorization.
2. Circulating water pump
The circulating water pump pumps water in the acid spray tower and absorbs NH in the waste gas by continuously spraying3. The circulating water pump is connected with an automatic control panel of the central control chamber, when the water quantity in the acid spray tower is reduced due to reflux and evaporation, the water in the acid spray tower can be supplemented in time through the control of the water level automatic control floating ball, and NH is prevented3Escaping through the exhaust pipe to the atmosphere.
3. Acid spray tower
The acid spray tower is connected with the gas collection main pipe and the exhaust pipe and mainly absorbs NH released in the thermal alkaline hydrolysis process3. UR as shown in fig. 2, in practical applications,two-stage acid spray towers connected in series can be adopted, and each stage of acid spray tower is provided with two layers of acid spray systems respectively. During the thermal alkaline hydrolysis of the excess sludge, a large amount of NH is released3The gas is conveyed to a first-stage acid spray tower through a gas collection main pipe, and most NH is absorbed by a first-layer acid spray system3After that, remaining NH3And then absorbed by the second layer acid spraying system. If there is still unabsorbed NH present3Then the wastewater enters a second-stage acid spray tower for further absorption. A certain amount of pure acid is added into the water circulation of the acid spray tower through the observation port to be under the strong acid condition (the pH value is approximately equal to 3-4), so that the absorption of NH by the acid spray tower is greatly increased3The performance of (c). When the ammonia nitrogen absorbed in the aqueous solution of the acid spray tower reaches a certain concentration, the ammonia nitrogen reflows to the reaction kettle to supplement the ammonia nitrogen required by the MAP reaction, and the purposes of synchronously removing the thermal alkaline hydrolysis odor of the residual sludge and recovering the ammonia nitrogen are achieved.
The above shows that the fundamental principle, the main features and the advantages of the utility model are described, do not deviate from the spirit and scope of the utility model, utilize the technical scheme, or technical personnel in the field are in the utility model discloses an under the inspiration, through various changes and improvement, and reach above-mentioned technological effect, all fall into the protection scope of the utility model.
Claims (10)
1. The utility model provides a get rid of sour spraying apparatus of surplus sludge thermokalite hydrolysis stink and recovery ammonia nitrogen in step which characterized in that: the device comprises an acid spray tower (1), wherein the front end of the acid spray tower is connected with a gas collecting pipe, the rear end of the acid spray tower is sequentially connected with a draught fan (3) and an exhaust pipe (9), and the top end in the acid spray tower is provided with a demister (11); a circulating water pump (2) is arranged beside the acid spray tower (1); the inlet end of the circulating water pump (2) is connected with the bottom of the acid spray tower, the outlet end of the circulating water pump is connected with a spray head (13) of the acid spray tower through an acid spray pipe (12), and the bottom of the acid spray tower is provided with a water tank (16) for controlling the water level in the acid spray tower, replenishing acid and remaining circulating water containing ammonia nitrogen.
2. The acid spraying equipment for synchronously removing the thermal alkaline hydrolysis odor of the residual sludge and recovering the ammonia nitrogen as claimed in claim 1, wherein the gas collecting pipe comprises a main gas collecting pipe (8), branch gas collecting pipes (7) and an exhaust port (6), and the front end of the acid spraying tower is connected with the main gas collecting pipe (8), the branch gas collecting pipes (7) and the exhaust port (6) in sequence.
3. The acid spraying equipment for synchronously removing the thermal alkaline hydrolysis odor of the residual sludge and recovering the ammonia nitrogen as claimed in claim 1, characterized by further comprising observation ports (10), wherein the observation ports (10) are respectively arranged on the acid spraying tower (1).
4. The acid spraying equipment for synchronously removing the thermal alkaline hydrolysis odor of the residual sludge and recovering the ammonia nitrogen as claimed in claim 3, characterized in that the equipment is arranged at the outer upper end of the acid spraying tower (1).
5. The acid spraying equipment for synchronously removing the thermal-alkaline hydrolysis odor and recovering the ammonia nitrogen from the residual sludge as claimed in claim 3, characterized in that the equipment is arranged at the outer middle end of the acid spraying tower (1).
6. The acid spraying equipment for synchronously removing the thermal alkaline hydrolysis odor of the residual sludge and recovering the ammonia nitrogen as claimed in claim 3, characterized in that the equipment is arranged at the outer lower end of the acid spraying tower (1).
7. The acid spraying equipment for synchronously removing the thermal alkaline hydrolysis odor of the residual sludge and recovering the ammonia nitrogen as claimed in claim 1, characterized by further comprising an automatic water level control floating ball (5), wherein the automatic water level control floating ball (5) is positioned inside the water tank (16) and is used for controlling the water level of the water tank and automatically supplementing the water amount in the acid spraying tower when the water amount in the acid spraying tower is reduced.
8. The acid spraying equipment for synchronously removing the thermal-alkaline hydrolysis odor of the residual sludge and recovering the ammonia nitrogen as claimed in claim 1, characterized by further comprising a cover plate (4), wherein the cover plate (4) is arranged on the water tank (16).
9. The acid spraying equipment for synchronously removing the thermal-alkaline hydrolysis odor of the residual sludge and recovering the ammonia nitrogen as claimed in claim 1, wherein a valve (15) is arranged on the acid spraying pipe (12).
10. The acid spraying equipment for synchronously removing the thermal-alkaline hydrolysis odor of the residual sludge and recovering the ammonia nitrogen as claimed in claim 1, wherein a return pipeline (14) is arranged on the acid spraying tower, and a valve (15) is arranged on the return pipeline (14).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120917805.8U CN215276612U (en) | 2021-04-28 | 2021-04-28 | Acid spraying equipment for synchronously removing residual sludge thermoalkaline hydrolysis odor and recycling ammonia nitrogen |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120917805.8U CN215276612U (en) | 2021-04-28 | 2021-04-28 | Acid spraying equipment for synchronously removing residual sludge thermoalkaline hydrolysis odor and recycling ammonia nitrogen |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215276612U true CN215276612U (en) | 2021-12-24 |
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ID=79538864
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120917805.8U Active CN215276612U (en) | 2021-04-28 | 2021-04-28 | Acid spraying equipment for synchronously removing residual sludge thermoalkaline hydrolysis odor and recycling ammonia nitrogen |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215276612U (en) |
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2021
- 2021-04-28 CN CN202120917805.8U patent/CN215276612U/en active Active
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