CN217148961U - Low-energy-consumption sludge thermal drying system - Google Patents
Low-energy-consumption sludge thermal drying system Download PDFInfo
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- CN217148961U CN217148961U CN202122238595.2U CN202122238595U CN217148961U CN 217148961 U CN217148961 U CN 217148961U CN 202122238595 U CN202122238595 U CN 202122238595U CN 217148961 U CN217148961 U CN 217148961U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/30—Wastewater or sewage treatment systems using renewable energies
- Y02W10/37—Wastewater or sewage treatment systems using renewable energies using solar energy
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Abstract
The utility model discloses a low energy consumption sludge heat drying system, it includes heat drying machine, vacuum predrying machine, one-level and second grade sludge preheater, one-level and second grade mummification tail gas heat exchanger, vacuum pump and circulating water system etc.. The vacuum pre-drying machine, the primary/secondary sludge preheater and the tail gas heat exchanger can fully utilize the residual heat of the drying system, and the water content of the sludge is reduced by more than 50% through the vacuum pre-drying machine, so that the energy-saving rate of the thermal drying of the sludge is up to more than 50%. The system can be used for energy-saving reconstruction or new system construction of the existing thermal drying machine, greatly reduces the energy consumption of the thermal drying machine, and has wide application prospect.
Description
Technical Field
The utility model relates to a low energy consumption mud heating power mummification system.
Background
With the rapid development of Chinese economy and the steady promotion of urbanization, and the increasing improvement of sewage discharge standards, the discharge amount of sewage and sludge in cities and towns in China is continuously increased. According to statistics, the annual yield of the wet sludge in China currently exceeds 4 million tons, and the wet sludge is continuously increased year by year. The dehydrated sludge discharged by the sewage plant has the water content of about 80 percent and has the characteristics of high water content, high organic matters, stink, viscosity and the like. Thermal drying is an important sludge treatment means, can not only realize sludge reduction and stabilization, but also is a key step for realizing sludge resource utilization, including landfill, incineration, agricultural utilization, heat energy utilization and the like.
The thermal drying is the most mature and effective sludge drying method, has the advantages of large treatment capacity, high drying speed, high integration level, small occupied area and the like, is widely popularized and applied in sludge treatment industries at home and abroad, and is the mainstream sludge drying technology at present. Typical sludge thermal drying equipment comprises a paddle type drying machine, a disc drying machine, a film drying machine and the like which take indirect heat transfer as a principle, and a belt type drying machine, a spray drying machine, a rotary sludge drying machine and the like which take direct heat transfer as a principle. The main disadvantage of thermal drying is high energy consumption, which is determined by the thermal drying principle: in the thermal drying process, the sludge is heated to the boiling point of water, water is vaporized, and the sludge absorbs a large amount of heat in the process, so that the drying energy consumption is high. Although the drying tail gas contains a large amount of latent heat of evaporation, the temperature and the taste of the tail gas are low, the heat energy utilization cost is high, and the tail gas contains complex components such as sludge dust particles and volatile matters, which bring difficulty to the heat energy utilization, so that the waste heat utilization of the tail gas is not considered in most sludge drying projects.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the technical problem that will solve is: the sludge is dried by heat, and the energy consumption is higher.
In order to solve the above problem, the utility model provides a low energy consumption heat drying system, it includes:
the primary sludge preheater and the secondary sludge preheater are used for preheating sludge and are sequentially connected in series;
the vacuum pre-drying machine is used for carrying out flash evaporation dehydration on the preheated sludge;
the thermal drying machine is used for further reducing moisture of the sludge subjected to flash evaporation dehydration, saturated steam is introduced into the thermal drying machine, and saturated water generated by the thermal drying machine enters the secondary sludge preheater;
the primary tail gas heat exchanger is used for collecting and treating low-temperature water vapor generated by the vacuum pre-drying machine;
the secondary tail gas heat exchanger is used for collecting and treating high-temperature water vapor generated by the thermal drying machine and redundant water vapor in the primary tail gas heat exchanger;
and circulating water supplied by the circulating water tank passes through a circulating water pump, and then circularly returns to the circulating water tank after sequentially passing through the primary tail gas heat exchanger, the secondary tail gas heat exchanger, the vacuum pre-drying machine and the primary sludge preheater.
Preferably, the vacuum pre-drying machine is connected with the thermal drying machine through a vacuum valve.
Preferably, the vacuum pre-drying machine is connected with the primary tail gas heat exchanger through a vacuum pump.
Preferably, the vacuum pre-drying machine comprises a jacket at the outer side, a hollow shaft is arranged in the jacket, and hollow blades are arranged on the hollow shaft.
Preferably, the system also comprises a washing tower for collecting low-temperature water vapor passing through the primary tail gas heat exchanger and high-temperature water vapor passing through the secondary tail gas heat exchanger.
More preferably, the interior of the washing tower is communicated with an induced draft fan.
Preferably, the thermal dryer is a paddle dryer, a disc dryer, a thin layer dryer or a fluidized bed dryer.
The utility model discloses a two-stage sludge pre-heater and two-stage tail gas heat exchanger realize the fractional utilization of sludge drying waste heat, and the energy consumption of vacuum pre-drying machine is whole to come from sludge drying waste heat recovery, only heating power mummification machine consumes outside heat source.
The utility model provides a low energy consumption sludge heat drying method, this method constitutes an organic system with main devices such as heat drying machine, vacuum predrying machine, two-stage sludge preheater, two-stage mummification tail gas heat exchanger and intermediate heat-carrying circulation system, has fully realized the cyclic utilization of sludge heat drying waste heat, can realize that sludge heat drying energy-saving rate is more than 50%. The method can be used for energy-saving reconstruction of the existing thermal drying machine, and the energy consumption of the thermal drying machine is greatly reduced.
Compared with the prior sludge thermal technology, the beneficial effects of the utility model are that: the energy consumption of the thermal drying of the sludge is obviously reduced, the energy consumption in the vacuum pre-drying machine is all from the waste heat discharged by the thermal drying machine, and the moisture content of the sludge entering the thermal drying machine is obviously reduced, so that the energy consumption of the thermal drying machine is greatly reduced, and compared with the energy consumption of the traditional thermal drying technology of the sludge, the energy consumption reduction amplitude can reach more than 50%.
Drawings
FIG. 1 is a schematic diagram of a low energy consumption heat drying system;
FIG. 2 is a cross-sectional view of a vacuum pre-dryer.
Detailed Description
In order to make the present invention more comprehensible, preferred embodiments are described in detail below with reference to the accompanying drawings.
Examples
As shown in fig. 1, for the utility model provides a low energy consumption heat drying system, it includes:
a primary sludge preheater 4 and a secondary sludge preheater 5 which are used for preheating the sludge 19 and are connected in series in sequence;
a vacuum pre-drying machine 2 for flash evaporation dehydration of the preheated sludge;
the thermal drying machine 1 is used for further reducing moisture of the sludge subjected to flash evaporation dehydration, saturated steam 13 is introduced into the thermal drying machine 1, and saturated water 14 generated by the thermal drying machine 1 enters a secondary sludge preheater 5;
the primary tail gas heat exchanger 6 is used for collecting and treating low-temperature water vapor 16 generated by the vacuum pre-drying machine 2;
the secondary tail gas heat exchanger 7 is used for collecting and processing high-temperature water vapor 15 generated by the thermal drying machine 1 and redundant water vapor in the primary tail gas heat exchanger 6;
the system comprises a circulating water tank 9, circulating water supply 17 of the circulating water tank 9 passes through a circulating water pump 10, and then returns to the circulating water tank 9 after sequentially passing through a primary tail gas heat exchanger 6, a secondary tail gas heat exchanger 7, a vacuum pre-drier 2 and a primary sludge preheater 4;
and the washing tower 11 is used for collecting low-temperature water vapor 16 passing through the primary tail gas heat exchanger 6 and high-temperature water vapor 15 passing through the secondary tail gas heat exchanger 7, and the inside of the washing tower 11 is communicated with the induced draft fan 12.
As shown in fig. 2, the vacuum pre-drying machine 2 includes a jacket 22 at the outer side, a hollow shaft 23 is arranged in the jacket, and a hollow blade 21 is arranged on the hollow shaft 23. The vacuum pre-drying machine 2 is connected with the thermal drying machine 1 through a vacuum valve 3; the vacuum pre-drying machine 2 is connected with a primary tail gas heat exchanger 6 through a vacuum pump 8.
The thermal dryer 1 is a paddle dryer, a disc dryer, a thin layer dryer or a fluidized bed dryer.
A low-energy-consumption heat drying method comprises the following steps:
the sludge 19 passes through a primary sludge preheater 4 and a secondary sludge preheater 5 and is preheated to a certain temperature, after entering a vacuum pre-drier 2, the moisture of the sludge is subjected to flash evaporation and dehydration, and the discharged low-temperature water vapor 16 enters a primary tail gas heat exchanger 6 through a vacuum pump 8 and is used for heating the circulating water supply 17 from a circulating water tank 9; after more than half of water is removed from the sludge in the vacuum pre-drying machine 2, the sludge enters a thermal drying machine 1 through a vacuum valve 3, the thermal drying machine 1 is indirect or direct heating type drying equipment taking saturated water vapor 13 as a heat-carrying medium, the sludge is further reduced in moisture in the thermal drying machine 1, and the discharged high-temperature water vapor 15 enters a secondary tail gas heat exchanger 7 for further increasing the water temperature of circulating water supply 17. The circulating water 17 is heated by a first-stage tail gas heat exchanger 6 and a second-stage tail gas heat exchanger 7 and then enters a jacket 22, a hollow shaft 23 and hollow blades 21 of the vacuum pre-drying machine 2 to be used as a heat source of the vacuum pre-drying machine 2; after heat is released in the vacuum pre-drying machine 2, the circulating water 17 enters a first-stage sludge preheater 4 to preheat sludge 19 under the action of a circulating water pump 10, and finally circulating return water 18 flows back to a water tank 9 to complete primary water circulation. The saturated steam 13 is released heat in the thermal drying machine 1 and condensed into saturated water 14, and enters the secondary sludge preheater 5 to further heat the temperature of the sludge 19. The low-temperature water vapor 16 and the high-temperature water vapor 15 are respectively discharged in the primary tail gas heat exchanger 6 and the secondary tail gas heat exchanger 7, and are converged under the action of the induced draft fan 12 to flow into the washing tower 11 for washing and then are discharged.
According to the actual sludge thermal drying engineering, the vacuum degree of the vacuum pre-drying machine 2 is 0.02MPa, the sludge moisture evaporation temperature is 60 ℃, the temperature of the discharged low-temperature water vapor 16 is 55-60 ℃, and the temperature of the circulating water supply 17 can be raised to about 50 ℃ through the primary tail gas heat exchanger 6. The water content of sludge 19 in a vacuum pre-drying machine 2 is reduced from 80% to 60%, the sludge enters a thermal drying machine 1 through a vacuum valve 3, the temperature of saturated steam 13 is 160 ℃, the sludge with the water content of 60% is further dried in the thermal drying machine 1 to dry sludge 20 with the water content of 20%, the temperature of high-temperature steam 15 discharged by sludge drying is about 95 ℃, the temperature of circulating water 17 from a primary tail gas heat exchanger 6 is further raised to about 90 ℃ through a secondary tail gas heat exchanger 7, the heated circulating water 7 provides a heat source for the vacuum pre-drying machine 2, the circulating water 17 after heat release is cooled to about 60 ℃, the circulating water enters a primary sludge preheater 4, the temperature of the sludge 19 is heated to about 45 ℃ from the normal temperature, and the temperature of circulating water 18 is reduced to about 35 ℃ and flows back to a circulating water tank 9. And the saturated steam 13 releases heat and then is converted into saturated water 14 at 160 ℃, the saturated water enters a secondary sludge preheater 5, the temperature of the sludge is further heated to about 100 ℃, and the saturated water enters a vacuum pre-drier 2 to undergo low-pressure flash evaporation and dehydration.
The total drying dehydration amount of each kilogram of sludge from 80 percent of water content to 20 percent is 0.75 kilogram, wherein the drying dehydration amount of the sludge in the vacuum pre-drying machine 2 is 0.5 kilogram, the drying dehydration amount in the thermal drying machine 1 is 0.25 kilogram, heat sources used in the vacuum pre-drying machine 2 are all derived from the waste heat of sludge drying tail gas, and only the heat source in the thermal drying machine 1 adopts external steam, so the energy saving of the thermal drying of the sludge can reach 67 percent.
Claims (7)
1. A low energy consumption sludge heat drying system is characterized by comprising:
a primary sludge preheater (4) and a secondary sludge preheater (5) which are used for preheating the sludge (19) and are connected in series in sequence;
a vacuum pre-drying machine (2) for flash evaporation dehydration of the preheated sludge;
the thermal drying machine (1) is used for further reducing moisture of the sludge subjected to flash evaporation dehydration, saturated steam (13) is introduced into the thermal drying machine (1), and saturated water (14) in the thermal drying machine (1) is communicated with the secondary sludge preheater (5);
the primary tail gas heat exchanger (6) is used for collecting and treating low-temperature water vapor (16) generated by the vacuum pre-drying machine (2);
a secondary tail gas heat exchanger (7) for collecting and processing the high-temperature water vapor (15) generated by the thermal drying machine (1) and the redundant water vapor in the primary tail gas heat exchanger (6);
the circulating water supply (17) of the circulating water tank (9) is sequentially communicated with the primary tail gas heat exchanger (6), the secondary tail gas heat exchanger (7), the vacuum pre-drying machine (2), the primary sludge preheater (4) and the circulating water tank (9) through a circulating water pump (10) to form circulating return water (18).
2. The thermal drying system for sludge with low energy consumption of claim 1, wherein the vacuum pre-drying machine (2) is connected with the thermal drying machine (1) through a vacuum valve (3).
3. The thermal drying system for sludge with low energy consumption of claim 1, wherein the vacuum pre-dryer (2) is connected with the primary tail gas heat exchanger (6) through a vacuum pump (8).
4. The thermal drying system for sludge with low energy consumption of claim 1, wherein the vacuum pre-drying machine (2) comprises a jacket (22) at the outer side, a hollow shaft (23) is arranged in the jacket, and hollow blades (21) are arranged on the hollow shaft (23).
5. The low-energy-consumption thermal drying system for sludge as claimed in claim 1, further comprising a washing tower (11) for collecting the low-temperature water vapor (16) passing through the primary tail gas heat exchanger (6) and the high-temperature water vapor (15) passing through the secondary tail gas heat exchanger (7).
6. The low-energy-consumption thermal drying system for sludge as claimed in claim 5, wherein the interior of the washing tower (11) is communicated with the induced draft fan (12).
7. The thermal drying system for sludge with low energy consumption of claim 1, wherein the thermal drying machine (1) is a paddle drying machine, a disc drying machine, a thin layer drying machine or a fluidized bed drying machine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122238595.2U CN217148961U (en) | 2021-09-15 | 2021-09-15 | Low-energy-consumption sludge thermal drying system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122238595.2U CN217148961U (en) | 2021-09-15 | 2021-09-15 | Low-energy-consumption sludge thermal drying system |
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| CN217148961U true CN217148961U (en) | 2022-08-09 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113683289A (en) * | 2021-09-15 | 2021-11-23 | 东华大学 | Low-energy-consumption thermal drying method for sludge |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113683289A (en) * | 2021-09-15 | 2021-11-23 | 东华大学 | Low-energy-consumption thermal drying method for sludge |
| CN113683289B (en) * | 2021-09-15 | 2024-09-13 | 东华大学 | Low-energy-consumption sludge thermal drying method |
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Granted publication date: 20220809 |