CN211999392U - High-efficiency energy-saving biochemical excess sludge treatment device - Google Patents
High-efficiency energy-saving biochemical excess sludge treatment device Download PDFInfo
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- CN211999392U CN211999392U CN201921964920.XU CN201921964920U CN211999392U CN 211999392 U CN211999392 U CN 211999392U CN 201921964920 U CN201921964920 U CN 201921964920U CN 211999392 U CN211999392 U CN 211999392U
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Abstract
The utility model discloses a biochemical excess sludge treatment equipment of high-efficient energy-conserving, wherein, processing apparatus includes that pretreatment pump, feeding concentrated machine, muddy water mix the heater, mud vapour mix the heater, feeding buffer tank, charge pump, material vapour mix the heater, feeding retort, concentrated hydroextractor, relief pressure valve, negative pressure flash tank, negative pressure compressor, booster pump, ejection of compact hydroextractor. The utility model discloses utilize three sets of hybrid heaters direct heating excess sludge, no heat transfer temperature difference loss, heating efficiency is high, and the flow resistance is little and difficult scale deposit. The sludge is subjected to dehydration and drying treatment by a dehydrator, the sludge reduction effect is obvious, the sludge returns to nature and serves as soil resource mud.
Description
Technical Field
The utility model relates to the technical field of biochemical excess sludge stock solution (excess sludge for short) innocent treatment, in particular to a high-efficiency energy-saving biochemical excess sludge treatment device.
Technical Field
The excess sludge produced after the treatment of the urban sewage treatment plant by using the activated sludge method is sludge-like flocculate which is a very complex heterogeneous sludge group consisting of inorganic particles, microbial aggregates, parasitic ova, pathogens, organic matters, colloids and the like, the content of macromolecular organic matters is as high as 60-70% of the dry matter of the sludge, the sludge has the main characteristics of high water content, the sludge is always in a colloid state, and the amount of water bound by the sludge colloid is large; the water content in the organic matters including the microbial aggregates, parasitic eggs, organic matters and the like is high, and the organic matters are difficult to remove.
The mechanical dehydration is usually adopted to obtain the sludge with the solid content of 20-30% every year, the sludge is easy to rot and smell, and the disposal difficulty is large. The existing landfill method, drying method and burning method cause environmental problems and have high disposal cost.
The utility model with the publication number of CN207451900U discloses a residual sludge treatment device, which uses a softened water heater, a heat transfer oil heater and a waste heat recovery heat exchanger. The utility model with the publication number CN209143989U uses a softened water heater and a waste heat recovery heat exchanger. The heater and the heat exchanger used in the above patent are both shell-and-tube heaters or heat exchangers, heated sludge flows in the heating tube, the pipeline is long, the flow resistance is large, and the problem of scaling or blockage in the tube wall of the heating tube exists. Therefore, it is necessary to develop and innovate new equipment for performing innocent treatment on excess sludge to produce innocent sludge meeting the discharge standard, so that the sludge can return to the nature and be utilized as soil resources.
Disclosure of Invention
The invention aims to provide a high-efficiency energy-saving biochemical excess sludge treatment device, which solves the problem of environmental influence caused by the defects of the conventional excess sludge treatment device.
The utility model adopts the technical proposal that: an efficient energy-saving biochemical excess sludge treatment device directly treats excess sludge with the water content of 97-99%. The device comprises a pretreatment pump, a feeding concentrator, a mud-steam mixing heater, a mud-steam mixing tank, a feeding booster pump, a low-pressure mixing heater, a feeding buffer tank, a feeding pump, a material-steam mixing heater, a feeding reaction tank, a low-pressure reducing valve, a low-pressure flash tank, a negative-pressure reducing valve, a negative-pressure flash tank, a negative-pressure compressor, a booster pump and a discharging dehydrator which are sequentially connected through pipelines; wherein, the inlet of the pretreatment pump is connected with a secondary sedimentation tank excess sludge pipe of a sewage treatment plant through a pipeline; a recovery steam inlet of the mud-steam mixing heater is connected with an outlet pipe of the negative pressure compressor through a recovery steam pipe; a low-pressure steam inlet of the low-pressure mixing heater is connected with an outlet pipe at the top of the low-pressure flash tank through a low-pressure steam pipe; the weight reducing agent adding branch pipe on the inlet pipe of the feed pump is connected with the weight reducing agent adding pipe; the steam inlet of the material steam mixing heater is connected with a heat supply steam pipe through a pipeline; and the sewage of the discharging dehydrator and the return water of the feeding thickener enter a sewage collecting system of a sewage treatment plant.
Further, the feed thickener is capable of thickening the incoming excess sludge to 1/2 volumes of return water; the rest 1/2 is concentrated sludge, and enters the sludge-steam mixing heater.
Further, the concentrated sludge entering the sludge-steam mixing heater is mixed with the added recovered steam, and the concentrated sludge is directly heated from 20 ℃ to 116 ℃.
Further, the sludge concentrated at 116 ℃ entering the low-pressure mixing heater is mixed with low-pressure steam, and the sludge is directly heated from 116 ℃ to 145 ℃.
Further, 145 ℃ sludge entering the material steam mixing heater is mixed with the added heat supply steam, and the sludge is directly heated from 145 ℃ to 175 ℃.
Furthermore, three sets of mixing heaters, namely the mud-steam mixing heater, the low-pressure mixing heater, the feeding buffer tank and the material-steam mixing heater, directly heat the mud without heat transfer temperature difference, the heating efficiency is high, a connecting pipeline between the devices is short, and the flow resistance is small.
The heating steam amount used by the material steam mixing heater is more than 49 percent of the heating steam amount used by the shell-and-tube heater.
The feeding reaction tank enables the entering 175 ℃ sludge to react for more than or equal to 60 minutes in the tank, can degrade and remove more than or equal to 90% of organic matters contained in the sludge, can remove organic matters such as microorganism aggregates and parasitic ova, only a small amount of sludge is remained after the sludge subjected to degradation and removal of the organic matters is dehydrated by the discharging dehydrator, and the sludge reduction effect is obvious.
The low-pressure reducing valve and the low-pressure flash tank separate steam generated by flash evaporation of sludge discharged after reaction in the feeding reaction tank by using a flash evaporation principle and use the steam as a heating heat source of the low-pressure mixing heater.
The negative pressure reducing valve and the negative pressure flash tank utilize the negative pressure flash evaporation principle to carry out flash evaporation on the sludge discharged from the low pressure flash tank to generate steam for separation, and the steam is recovered and reused by the negative pressure compressor to serve as a heating heat source of the sludge-steam mixing heater.
The heat of the steam recycled by the low-pressure flash tank and the negative-pressure flash tank accounts for more than 80% of the total heat consumption for heating the sludge from 20 ℃ to 175 ℃.
The utility model has the advantages that: the high-efficiency energy-saving biochemical excess sludge treatment device of the utility model shares three sets of mixed heaters to directly heat excess sludge, thereby overcoming the problems of long equipment pipeline, large flow resistance and serious scaling of the inner wall of the pipe caused by the fact that a shell-and-tube heater is used for heating excess sludge; the residual sludge is heated from 20 ℃ to more than 175 ℃ by utilizing three sets of mixed heaters for direct heating, the heat transfer temperature difference is not needed, the heating efficiency is high, and the energy consumption for providing steam is reduced by more than 49 percent compared with the energy consumption for heating the sludge by using a conventional shell-and-tube heater; the sludge is evaporated to remove steam through low-pressure flash evaporation and negative-pressure flash evaporation by utilizing the principle of reduced-pressure flash evaporation, the steam is recycled as a heating source, the temperature of the sludge is increased from 20 ℃ to 145 ℃, the heat heated by the recycled steam accounts for more than 80% of the total heat consumption required by heating, and the energy-saving effect is obvious; degrading more than or equal to 90 percent of organic matters by using high temperature of more than or equal to 175 ℃ and the added decrement agent, and killing parasitic insect eggs and pathogens; and drying and dehydrating the residual sludge by a discharging dehydrator, reducing the water content of the sludge to be below 60%, returning to nature, and utilizing the sludge as soil resources.
Drawings
FIG. 1 is a schematic flow diagram of a high-efficiency energy-saving biochemical excess sludge treatment device.
In the figure: 1. a pretreatment pump; 2. a feed thickener; 3. a mud-steam mixing heater, 4, a mud-steam mixing tank; 5. A feed booster pump; 6. a low pressure hybrid heater; 7. a feed buffer tank; 8. a feed pump; 9. a material and steam mixing heater; 10. a feed reaction tank; 11. A low pressure relief valve; 12. a low-pressure flash tank; 13. a negative pressure reducing valve; 14. a negative pressure flash tank; 15. a negative pressure compressor; 16. a booster pump; 17. discharging and dewatering machine; 18. a low pressure steam pipe; 19. and recovering the steam pipe.
Detailed Description
As shown in figure 1, the utility model solves the problem of environmental impact caused by the deficiency of the existing excess sludge treatment device. Can directly treat the excess sludge with the water content of 97-99 percent.
The utility model relates to an energy-efficient excess sludge treatment device, it includes equipment: the system comprises a pretreatment pump 1, a feeding thickener 2, a mud-steam mixing heater 3, a mud-steam mixing tank 4, a feeding booster pump 5, a low-pressure mixing heater 6, a feeding buffer tank 7, a feeding pump 8, a material-steam mixing heater 9, a feeding reaction tank 10, a low-pressure reducing valve 11, a low-pressure flash tank 12, a negative-pressure reducing valve 13, a negative-pressure flash tank 14, a negative-pressure compressor 15, a booster pump 16, a discharging dehydrator 17, a low-pressure steam pipe 18 and a recovery steam pipe 19.
The system comprises a pretreatment pump 1, a feeding concentrator 2, a mud-steam mixing heater 3, a mud-steam mixing tank 4, a feeding booster pump 5, a low-pressure mixing heater 6, a feeding buffer tank 7, a feeding pump 8, a material-steam mixing heater 9, a feeding reaction tank 10, a low-pressure reducing valve 11, a low-pressure flash tank 12, a negative-pressure reducing valve 13, a negative-pressure flash tank 14, a negative-pressure compressor 15, a booster pump 16 and a discharging dehydrator 17, wherein the pretreatment pump 1, the feeding concentrator 2, the mud-steam mixing heater 3, the mud-steam mixing tank.
The inlet of the sludge pretreatment pump 1 is connected with a secondary sedimentation tank excess sludge pipe of a sewage treatment plant through a pipeline.
The recovery steam inlet of the mud-steam mixing heater 3 is connected with the outlet pipe of the negative pressure compressor 15 through a recovery steam pipe 19.
The low-pressure steam inlet of the low-pressure mixing heater 6 is connected with the outlet pipe at the top of the low-pressure flash tank 12 through a low-pressure steam pipe 18.
The reducing agent adding branch pipe on the front inlet pipe of the feed pump 8 is connected with the reducing agent adding pipe;
the steam inlet of the material steam mixing heater 9 is connected with a heat supply steam pipe through a pipeline;
and the sewage of the discharging dehydrator 17 and the return water of the feeding thickener 2 enter a sewage collecting system of a sewage treatment plant. The utility model discloses the working process is:
1. the inlet of the sludge pretreatment pump 1 receives residual sludge (containing 98 percent of water) in a secondary sedimentation tank of a sewage treatment plant through a pipeline, the pressure is increased to 300kpa, and the residual sludge is discharged to a feed thickener 2;
2. the feed thickener 2 concentrates and removes the reflux water of 1/2 from the excess sludge, retains 1/2 concentrated sludge (containing 96 percent of water), and conveys the sludge to the sludge-steam mixing heater 3；
3. The 1/2 concentrated sludge entering the sludge-steam mixing heater 3 is mixed with the added recovered steam, the sludge is directly heated to 116 ℃ from 20 ℃, and then the sludge enters the sludge-steam mixing tank 4;
4. the sludge-steam mixing tank further mixes and liquefies the entered sludge at 116 ℃ with steam, then discharges non-condensable redundant steam, the sludge enters the feeding booster pump 5 again to increase the pressure of the sludge to be more than or equal to 500Kpa, and the sludge is discharged to the low-pressure mixing heater 6;
5. the sludge at 116 ℃ entering the low-pressure mixing heater 6 is mixed with the low-pressure steam added, and the sludge is directly heated from 116 ℃ to 145 ℃; then enters a feeding buffer tank 7,
6. the feeding buffer tank 7 is used for further mixing and liquefying the sludge and steam, discharging non-condensable redundant steam, and then feeding the sludge into the feeding pump 8 to increase the pressure of the sludge to be more than or equal to 1100 Kpa; discharging a stripping gas mixing heater 9;
7. the sludge at 145 ℃ fed into the material and steam mixing heater 9 is mixed with the added heat supply steam, the sludge is directly heated to 175 ℃ from 145 ℃, and then the sludge enters the material feeding reaction tank 10;
8. the sludge at 175 ℃ entering the feeding reaction tank 10 stays in the tank for reaction for more than or equal to 60 minutes, organic matters more than or equal to 90 percent contained in the sludge are degraded and removed, meanwhile, organic matters such as microorganism aggregates, parasitic ova and the like are removed, and the reaction sludge enters a pressure reducing valve 11 and a low-pressure flash tank 12;
9. the low-pressure reducing valve 11 and the low-pressure flash tank 12 utilize the flash evaporation principle to separate steam generated by flash evaporation of sludge discharged after the reaction of the feeding reaction tank 10, and the steam is directly used as a heating source of the low-pressure mixing heater 6 to increase the temperature of the sludge from 145 ℃ to 175 ℃, and the sludge discharged from the low-pressure flash tank 12 enters the negative-pressure reducing valve 13 and the negative-pressure flash tank 14;
10. the negative pressure reducing valve 13 and the negative pressure flash tank 14 separate steam evaporated by negative pressure flash evaporation of the sludge discharged from the low pressure flash tank 12 by using a negative pressure flash evaporation principle, and the steam is recovered and reused by the negative pressure compressor 15 as a heating heat source of the sludge-steam mixing heater 3; the temperature of the sludge is increased from 20 ℃ to 116 ℃, and the sludge discharged from the negative pressure flash tank 14 enters the booster pump 16;
11. the steam is evaporated by two-stage pressure reduction flash evaporation through the low-pressure reducing valve 11, the low-pressure flash evaporation tank 12, the negative-pressure reducing valve 13 and the negative-pressure flash evaporation tank 14, the temperature of the sludge is increased to 145 ℃ from 20 ℃ by recycling the steam as a heating heat source of the mixing heater, and the heat of the recycled steam accounts for more than 80% of the total heat consumption of the sludge heated to 175 ℃;
12. the booster pump 16 increases the pressure of negative pressure sludge entering the pump to be more than or equal to 300Kpa, then the negative pressure sludge enters the discharging dehydrator 14 to remove water in the sludge, the water content of the discharged sludge is reduced to be below 60%, the sludge degraded to remove more than 90% of organic matters is dehydrated by the discharging dehydrator 17, only a small amount of sludge is remained, and the sludge reduction effect is obvious; returning to nature and utilizing as soil resource.
Application and implementation: the method comprises the steps of calculating the daily biochemical excess sludge of a certain sewage treatment plant by using a mathematical model, taking the average inlet temperature of the sludge to be 20 ℃, and heating the sludge to be 175 ℃ from 20 ℃ by using the technology of the utility model, wherein the sludge needs to be heated by 493.4kg/h of heat-supply steam including heat dissipation loss; by utilizing the technology of the utility model CN209143989U, 1000kg/h of heating steam is needed under the same treatment capacity and temperature, and the calculated energy-saving effect reaches over 49 percent.
The above description is only a preferred embodiment of the present invention, and the present invention is not limited thereto, and any modifications, equivalent substitutions and improvements made to the arrangement number and position of the pressure, temperature, flow and mixed heater according to the technical matters of the present invention should be included in the protection scope of the present invention.
Claims (1)
1. The utility model provides a biochemical excess sludge treatment device of high-efficient energy-conserving which characterized in that: the device comprises a pretreatment pump (1), a feeding concentrator (2), a mud-steam mixing heater (3), a mud-steam mixing tank (4), a feeding booster pump (5), a low-pressure mixing heater (6), a feeding buffer tank (7), a feeding pump (8), a material-steam mixing heater (9), a feeding reaction tank (10), a low-pressure reducing valve (11), a low-pressure flash tank (12), a negative-pressure reducing valve (13), a negative-pressure flash tank (14), a negative-pressure compressor (15), a booster pump (16) and a discharging dehydrator (17) which are sequentially connected through pipelines; wherein the content of the first and second substances,
an inlet of the pretreatment pump (1) is connected with a secondary sedimentation tank excess sludge pipe of a sewage treatment plant through a pipeline;
a recovery steam inlet of the mud-steam mixing heater (3) is connected with an outlet pipe of the negative pressure compressor (15) through a recovery steam pipe (19);
a low-pressure steam inlet of the low-pressure mixing heater (6) is connected with an outlet pipe at the top of the low-pressure flash tank (12) through a low-pressure steam pipe (18);
the weight reducing agent adding branch pipe on the inlet pipe of the feed pump (8) is connected with the weight reducing agent adding pipe;
a steam inlet of the material steam mixing heater (9) is connected with a heat supply steam pipe through a pipeline;
and the sewage of the discharging dehydrator (17) and the return water of the feeding thickener (2) enter a sewage collecting system of a sewage treatment plant.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921964920.XU CN211999392U (en) | 2019-11-14 | 2019-11-14 | High-efficiency energy-saving biochemical excess sludge treatment device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921964920.XU CN211999392U (en) | 2019-11-14 | 2019-11-14 | High-efficiency energy-saving biochemical excess sludge treatment device |
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| Publication Number | Publication Date |
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| CN211999392U true CN211999392U (en) | 2020-11-24 |
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| CN201921964920.XU Active CN211999392U (en) | 2019-11-14 | 2019-11-14 | High-efficiency energy-saving biochemical excess sludge treatment device |
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Effective date of registration: 20210713 Address after: 524000 Lingbei industrial base, Suixi County, Zhanjiang City, Guangdong Province Patentee after: ZHANJIANG YUANTONG HI-TECH Co.,Ltd. Address before: 524000 room 506, building 24, Nanyou Third District, Jizui Road, Potou District, Zhanjiang City, Guangdong Province Patentee before: Chen Yushu |