CN103145310B - Sludge drying system combining solar energy and multi-heat-source heat pump - Google Patents
Sludge drying system combining solar energy and multi-heat-source heat pump Download PDFInfo
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- CN103145310B CN103145310B CN201110401579.9A CN201110401579A CN103145310B CN 103145310 B CN103145310 B CN 103145310B CN 201110401579 A CN201110401579 A CN 201110401579A CN 103145310 B CN103145310 B CN 103145310B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 21
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- 238000007791 dehumidification Methods 0.000 description 4
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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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- Drying Of Solid Materials (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention relates to a sludge drying system combining solar energy and a multi-heat-source heat pump, belonging to the technical field of sludge drying. In order to improve the energy utilization rate of the solar sludge drying technology, the provided system comprises: the solar greenhouse system comprises a greenhouse enclosure module, a bottom plate module and a gas guide module; the greenhouse enclosure module forms an external framework of a greenhouse subsystem, the bottom plate module bears sludge to be dried, and the gas guide module introduces hot air from the outside to the interior of the greenhouse subsystem and discharges wet air in the interior of the greenhouse subsystem; and the heat pump subsystem is connected with the gas diversion module, introduces hot air into the greenhouse subsystem through the gas diversion module and dehumidifies the humid air exhausted by the greenhouse subsystem. The system adopts the solar greenhouse to carry out sludge drying, has simple maintenance and high reliability, carries out moisture discharge and hot gas internal transmission between the system and the heat pump subsystem, has compact structure, and utilizes the heat pump to heat and dehumidify, thereby improving the energy utilization rate of the sludge drying process.
Description
Technical Field
The invention belongs to the technical field of sludge drying, and relates to a sludge drying system combining solar energy and a multi-heat-source heat pump.
Background
Sludge drying is an important link of municipal sewage treatment and is also a technological process with higher energy consumption. The water content of the sludge is reduced through drying treatment, so that the purposes of recycling, stabilizing, reducing and harmlessness can be achieved. At present, the technical idea of drying sludge by using solar energy is utilized, and abundant solar energy resources can be used for a free, so that a large amount of conventional energy can be saved, and the method has great economic and environmental benefits.
The main characteristics of solar energy utilization include:
(1) universality: the sunlight generally irradiates the earth, whether on land or sea, and whether on mountains or islands, and can be directly developed and utilized without mining and transportation;
(2) no pollution: the development and utilization of solar energy can not pollute the environment, and the solar energy is one of the cleanest energy sources, and is extremely precious today when the environmental pollution is more and more serious;
(3) the energy is huge: solar radiant energy reaching the earth's surface every year amounts to about 130 trillion tons of standard coal, the total amount of which is the largest energy source that can be developed in the world today;
(4) long service life: the energy of the sun is inexhaustible in the sense that the hydrogen storage is sufficient to last billions of years, as estimated from the current rate of nuclear energy production by the sun, and the earth has a lifetime of about several billions of years.
However, under the current conditions of the prior art, the solar energy also has the following defects:
(1) dispersibility: the total amount of solar radiation reaching the earth's surface, although large, is low in fluence. On average, the irradiance of solar radiation is the largest at noon in summer under the condition of clear weather, and the solar energy received in an area of 1 square meter perpendicular to the sunlight direction is about 1000W on average; if the average is daily and nightly all the year round, only about 200W is needed. In winter, the energy flow density is low, but in cloudy days, the energy flow density is about half of that in winter, and in cloudy days, the energy flow density is about 1/5;
(2) instability: due to the limitation of natural conditions such as day and night, seasons, geographical latitude and altitude and the influence of random factors such as sunny, cloudy and rain, solar irradiance reaching a certain ground is intermittent and extremely unstable, which increases the difficulty for large-scale application of solar energy.
For the above reasons, the solar energy has the disadvantages of low energy flow density, non-continuity, and high weather influence, so that the required sludge treatment amount can not be ensured within a period of time by only using the solar energy. Therefore, how to more reasonably and effectively utilize solar energy to carry out sludge drying treatment is a very valuable subject and a technology to be perfected in the current municipal sewage treatment system.
Disclosure of Invention
Technical problem to be solved
The invention aims to solve the technical problem of how to improve the energy utilization rate of the solar sludge drying technology.
(II) technical scheme
In order to solve the technical problem, the invention provides a sludge drying system combining solar energy and a multi-heat-source heat pump, which comprises:
the solar greenhouse system comprises a greenhouse enclosure module, a bottom plate module and a gas guide module; the greenhouse enclosure module forms an external framework of the solar greenhouse system, the bottom plate module is used for bearing sludge to be dried, and the gas guide module is used for guiding hot air from the outside to the interior of the solar greenhouse system and discharging wet air in the interior of the solar greenhouse system;
and the heat source of the heat pump subsystem comprises external ambient atmosphere and reclaimed water, the heat pump subsystem is connected with the gas diversion module, is internally provided with a closed circulating system consisting of an evaporator group, an expansion valve group, a condenser, a fixed-frequency compressor and a corresponding pipeline, and is used for guiding hot air into the solar greenhouse subsystem through the gas diversion module and dehumidifying humid air exhausted from the solar greenhouse subsystem.
The greenhouse enclosure module comprises an enclosure structure made of heat-insulating materials with selective permeability to sunlight.
The bottom plate module comprises two layers, wherein the lower layer is a heat insulation layer, and the upper layer is a sludge bearing layer.
The solar house warming system further comprises a heat preservation film layer, the heat preservation film layer is arranged above the house warming enclosure module, and the heat preservation film layer is connected with a driving device used for unfolding or folding the heat preservation film layer.
The solar greenhouse system further comprises a sludge turning module, the sludge turning module is arranged above the sludge layer, a rotary drum is arranged at the center of the sludge turning module, a threaded comb cutter is fixedly mounted on the rotary drum, and the rotary drum is connected with a driving motor to rotate and move in the linear direction under the driving of a motor.
The air flow guiding module comprises an axial flow fan, a greenhouse air outlet and a greenhouse air inlet.
The first expansion valve of the expansion valve group is connected with the first evaporator of the evaporator group in series, the second expansion valve of the expansion valve group is connected with the second evaporator of the evaporator group in series, and the third expansion valve of the expansion valve group is connected with the third evaporator of the evaporator group in series, so that three groups of sub-pipelines connected in series are formed.
Wherein, the three groups of series sub-pipelines are arranged in parallel to form parallel sub-pipelines.
The parallel sub-pipeline is connected with the condenser and the fixed-frequency compressor in series, and the formed pipeline is communicated with a greenhouse air outlet and a greenhouse air inlet of the gas diversion module respectively.
(III) advantageous effects
Compared with the prior art, the technical scheme of the invention has the following characteristics:
(1) the invention adopts the solar greenhouse as the sludge drying place, has simple maintenance and high reliability, utilizes the gas guide module to perform the work of moisture discharge and hot gas internal transmission between the gas guide module and the heat pump subsystem, has compact system structure, and utilizes the heating and dehumidifying functions of the heat pump, thereby improving the energy utilization rate of the sludge drying process.
(2) Furthermore, the invention adopts a heat pump subsystem which fully utilizes air and water heat energy in a sewage plant, and adopts a fixed-frequency compressor to work to complete heating and dehumidifying functions, only a small amount of electric energy or fuel energy is consumed to change waste gas in a drying greenhouse or a large amount of free heat energy contained in the surrounding environment into high-temperature heat energy meeting the requirement for heating the intake air of the greenhouse, the prepared useful heat energy is always larger than the consumed electric energy or fuel energy, namely the heat efficiency of the heat pump subsystem is always larger than 1, thereby further realizing energy conservation and further improving the energy utilization rate.
(3) Furthermore, according to the structural arrangement of the heat pump subsystem, the annual high-efficiency operation of the sludge drying system in different seasons and different heat source requirements can be realized. Therefore, the defects caused by the solar energy in the existing solar energy utilization process are overcome, the heat load requirement required by sludge treatment is met, and the solar energy, an external air heat source and a reclaimed water heat source are utilized as much as possible, so that the energy utilization rate is obviously further improved.
Drawings
Fig. 1 is a schematic structural diagram of a sludge drying system combining solar energy and a multi-heat-source heat pump provided by the invention.
Wherein:
1. a greenhouse air outlet; 2. a fan; 3. an evaporator; 4. an evaporator; 5. a water pump; 6. a water inlet and a water outlet; 7. an evaporator; 8. a fan; 9. an outdoor atmosphere air inlet; 10. an outdoor atmosphere air outlet; 11. a fixed-frequency compressor; 12. an expansion valve; 13. a middle water outlet; 14. an expansion valve; 15. an expansion valve; 16. a condenser; 17. a greenhouse air inlet; 18. a drive device; 19. a heat preservation film layer; 20. an enclosure structure; 21. an axial flow fan; 22. a mud turning module; 23. a sludge layer; 24. a sludge bearing layer; 25. and (7) an insulating layer.
Fig. 2 is a system schematic diagram of the sludge drying system of the present invention in the case of operating a heat pump subsystem with ambient air as a heat source.
Fig. 3 is a system schematic diagram of the sludge drying system of the present invention in the operation of a heat pump subsystem using reclaimed water as a heat source.
Fig. 4 is a system diagram of the sludge drying system in a dehumidification operation state.
Detailed Description
In order to make the objects, contents and advantages of the present invention clearer, the following detailed description of the embodiments of the present invention will be made in conjunction with the accompanying drawings and examples.
In order to improve the energy utilization rate of the solar sludge drying technology, the invention provides a sludge drying system combining solar energy and a multi-heat-source heat pump, as shown in fig. 1, the system comprises: a solar house warming system and a heat pump subsystem; wherein,
the solar greenhouse system comprises a greenhouse enclosure module, a bottom plate module, a gas guide module, a heat preservation film layer 19 and a mud turning module 22.
The greenhouse enclosure modules form the external framework of the solar greenhouse system and include an enclosure 20 comprised of an insulating material that is selectively transparent to sunlight, preferably glass or plastic film or polycarbonate hollow panels, which when exposed to sunlight, allows a significant portion of the solar energy to enter the greenhouse due to the high penetration rate of such materials for small wavelengths, such as radiant energy having a wavelength below 2.2 μm. Meanwhile, due to the low temperature of objects in the greenhouse, the radiation energy of the greenhouse is mostly in the infrared range with the wavelength being more than 3 mu m. And the glass or plastic film has small penetration ratio to the radiant energy with the wavelength more than 3 mu m, thereby preventing the radiant energy from being dissipated to the outside of the greenhouse. Therefore, the solar greenhouse is used as a sludge drying place, on one hand, most of solar energy can penetrate through the solar greenhouse and enter the greenhouse, on the other hand, the radiation energy of objects in the greenhouse can be prevented from being dissipated to the outside of the greenhouse, and therefore the heat preservation effect is achieved.
The bottom plate module is located the bottom surface of greenhouse for bear the mud of treating the mummification, it divide into two-layer from top to bottom, and the lower floor is the heat preservation 25 that preferably is spread by the polystyrene board, can effectively prevent that the heat from scattering and disappearing in a large number through the underground, and the upper strata is the mud bearer layer 24 that preferably constitutes by the concrete, place the mud layer 23 of treating the mummification on the mud bearer layer 24.
The air guide module is used for introducing hot air into the solar house warming system from the outside and discharging wet air in the solar house warming system; the greenhouse air inlet and outlet device comprises an axial flow fan 21, a greenhouse air outlet 1 and a greenhouse air inlet 17.
The heat preservation film layer 19 is arranged above the greenhouse enclosure module, and the heat preservation film layer 19 is connected with a driving device 18 for spreading or retracting the heat preservation film layer. Preferably, the heat-insulating film layer 19 is a heat-insulating quilt, and the driving device 18 is a roller shutter; when the heat preservation is folded, the electric rolling shutter is wrapped on an electric bearing of the rolling shutter machine, and sunlight directly penetrates through the enclosure structure 20 in the daytime to heat air in the greenhouse. The heated air is continuously sent to the upper part of the surface layer of the sludge layer 23 through the axial flow fan 21 arranged in the middle of the greenhouse, and is subjected to heat and moisture exchange with the sludge layer 23. In the evening, the heat preservation quilt is spread out by operating the curtain rolling machine and covers the outer side of the enclosure structure 20, so that the heat loss in the greenhouse can be effectively reduced, and the cooling speed of indoor air is delayed.
In order to strengthen the heat and moisture exchange process of sludge and air, a sludge turning module 22 is further arranged in the greenhouse, the sludge turning module 22 is arranged above a sludge layer 23, a rotary drum is arranged at the center of the sludge layer, a thread comb knife is fixedly arranged on the rotary drum and used for turning over the sludge, and the rotary drum is connected with a frequency driving motor so as to rotate and move in the linear direction under the driving control of the motor.
The heat pump subsystem is connected with the gas flow guide module and used for guiding hot air into the solar warm house system through the gas flow guide module and dehumidifying humid air exhausted from the solar warm house system.
The heat source of the heat pump subsystem comprises external ambient atmosphere and reclaimed water, and the heat source comprises a closed circulation system consisting of an evaporator group, an expansion valve group, a condenser 16, a fixed-frequency compressor 11 and corresponding pipelines. The evaporator group comprises an evaporator 3, an evaporator 4 and an evaporator 7; the expansion valve group comprises an expansion valve 12, an expansion valve 14 and an expansion valve 15.
The expansion valve 15 is connected in series with the evaporator 3, the expansion valve 14 of the expansion valve group is connected in series with the evaporator 4, and the expansion valve 12 is connected in series with the evaporator 7, so as to form three groups of series sub-pipelines, then the three groups of series sub-pipelines are connected in parallel to form a parallel sub-pipeline, finally, the parallel sub-pipeline is connected in series with the condenser 16 and the fixed-frequency compressor 11, and the formed pipeline is communicated with the air outlet 1 and the air inlet 17 of the gas diversion module respectively.
The workflow of the system is described in detail below with reference to the drawings.
In order to ensure that the required sludge throughput is achieved over a period of time, sufficient heat must be input at the beginning of the drying process at one time. Therefore, in addition to the solar energy providing part of the heat load, the invention is also provided with a heat pump subsystem as an auxiliary heat source to improve the utilization efficiency of the energy. The workflow of the present system will be described below according to different application scenarios.
Firstly, in summer of China, when the ambient atmospheric temperature is higher than the temperature of water in a sewage treatment plant, the air source heat pump subsystem operates. As shown in fig. 2, the blower 2 and the blower 8 are turned on to discharge humid air from the greenhouse and introduce hot air from the outside, respectively, and then the expansion valve 12 is opened to keep the expansion valve 14 and the expansion valve 15 in a closed state. At the moment, outdoor air is continuously sucked into the evaporator 7 for dehumidification, a refrigeration working medium in the evaporator 7 absorbs heat in the atmospheric environment for evaporation, low-temperature low-pressure liquid is changed into low-temperature low-pressure gas, the gas is changed into high-temperature high-pressure gas after being boosted by the fixed-frequency compressor 11, the high-temperature high-pressure refrigeration working medium gas in the condenser 16 emits heat to heat air in the greenhouse, the working medium is condensed into liquid, the liquid is throttled by the expansion valve 12 and then changed into low-temperature low-pressure liquid, and the low-temperature low-pressure liquid enters the evaporator 7 to start next. The air in the greenhouse is heated and then sent to the dried sludge blanket 23.
Then, when the ambient atmospheric temperature is lower than the temperature of the reclaimed water in the sewage treatment plant in winter in China, the heat pump subsystem which takes the reclaimed water as a heat source operates. As shown in fig. 3, the blower 2 and the water pump 5 are turned on, the expansion valve 14 is opened, and the expansion valve 12 and the expansion valve 15 are kept closed. At the moment, the reclaimed water is continuously sent into the evaporator 4 through the water pump 5, the refrigeration working medium in the evaporator 4 absorbs the heat in the reclaimed water to evaporate, the low-temperature low-pressure liquid is changed into low-temperature low-pressure gas, the low-temperature low-pressure gas is changed into high-temperature high-pressure gas after being boosted by the fixed-frequency compressor 11, the high-temperature high-pressure refrigeration working medium gas in the condenser 16 emits heat to heat the air in the greenhouse, the working medium is condensed into liquid, the liquid is throttled by the expansion valve 14 and then changed into low-temperature low-pressure liquid, and the low. The air in the greenhouse is heated and then sent to the dried sludge blanket 23. The reason that the reclaimed water is adopted as the low-temperature heat source of the heat pump is that the reclaimed water has better water quality than sewage, has small corrosion to the evaporator of the heat pump and slow scaling, and is favorable for the long-term reliable operation of the system.
Therefore, the heat pump can be ensured to always operate between a smaller high-low temperature heat source temperature difference no matter in summer or winter, and the energy utilization rate of the solar drying system is improved.
In addition, when the air supply temperature of the air inlet 17 of the greenhouse reaches the set value and the greenhouse needs to be dehumidified, the operation state of the heat pump subsystem is switched to the dehumidification operation mode, as shown in fig. 4, the expansion valve 15 is opened to make the expansion valve 12 and the expansion valve 14 in the closed state, the humid air exhausted from the greenhouse is continuously sucked into the evaporator 3 for dehumidification, the refrigerant in the evaporator 3 absorbs the heat in the humid air and evaporates, the low-temperature low-pressure liquid is changed into the low-temperature low-pressure gas, the low-temperature low-pressure gas is changed into the high-temperature high-pressure gas after being boosted by the fixed-frequency compressor 11, the high-temperature high-pressure refrigerant gas in the condenser 16 emits the heat to heat the dehumidified air, the refrigerant is condensed into the liquid, the low-temperature low-pressure liquid after being throttled by the expansion. The air in the greenhouse is heated and then sent to the dried sludge layer 23, so that the energy utilization rate is improved by continuously recovering the heat in the exhaust gas of the greenhouse.
In conclusion, the sludge drying system combining the solar energy and the multi-heat-source heat pump provided by the invention fully utilizes the heat energy of air and water in a sewage plant, can complete the heating and dehumidifying functions of the heat pump by adopting one fixed-frequency compressor, has a compact structure, and is easy to realize the annual high-efficiency operation of the sludge drying system. The solar greenhouse is used as a sludge drying place, so that the maintenance is simple and the reliability is high. The whole system has obvious energy saving and greatly improves the energy utilization rate.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (7)
1. A sludge drying system combining solar energy and a multi-heat-source heat pump is characterized by comprising:
the solar greenhouse system comprises a greenhouse enclosure module, a bottom plate module and a gas guide module; the greenhouse enclosure module forms an external framework of the solar greenhouse system, the bottom plate module is used for bearing sludge to be dried, and the gas guide module is used for guiding hot air from the outside to the interior of the solar greenhouse system and discharging wet air in the interior of the solar greenhouse system;
the heat pump subsystem is connected with the gas diversion module, is internally provided with a closed circulating system consisting of evaporator groups (3, 4 and 7), expansion valve groups (12, 14 and 15), a condenser (16), a fixed-frequency compressor (11) and corresponding pipelines, and is used for introducing hot air into the solar energy house-warming system through the gas diversion module and dehumidifying humid air exhausted from the solar energy house-warming system;
wherein first expansion valve (15) of expansion valve group with first evaporimeter (3) series connection of evaporimeter group sets up second expansion valve (14) of expansion valve group with second evaporimeter (4) series connection of evaporimeter group sets up third expansion valve (12) of expansion valve group with third evaporimeter (7) of evaporimeter group set up in series connection to form three group's series connection subducts, three group's series connection subducts are parallelly connected to be set up, form parallelly connected subducts.
2. The combined solar and multi-heat source heat pump sludge drying system of claim 1 wherein the greenhouse enclosure module comprises an enclosure (20) comprised of insulation material that is selectively transparent to sunlight.
3. The combined solar and multi-heat-source heat pump sludge drying system of claim 1, wherein the floor module comprises two layers, the lower layer is an insulating layer (25), and the upper layer is a sludge bearing layer (24).
4. The sludge drying system combining solar energy and a multi-heat-source heat pump as claimed in claim 1, wherein the solar house warming system further comprises a heat insulation film layer (19), the heat insulation film layer (19) is disposed above the house warming enclosure module, and the heat insulation film layer (19) is connected with a driving device (18) for spreading or retracting the heat insulation film layer.
5. The sludge drying system combining the solar energy and the multi-heat-source heat pump as claimed in claim 1, wherein the solar energy house-warming system further comprises a sludge turning module (22), the sludge turning module (22) is disposed above the sludge blanket (23), a rotating drum is disposed at a central portion of the sludge blanket, a thread comb is fixedly mounted on the rotating drum, and the rotating drum is connected with a driving motor to rotate and move in a linear direction under the driving of the motor.
6. The combined solar and multi-heat-source heat pump sludge drying system of claim 1, wherein the gas diversion module comprises an axial flow fan (21), a greenhouse air outlet (1) and a greenhouse air inlet (17).
7. The solar energy and multi-heat-source heat pump combined sludge drying system according to claim 6, wherein the parallel sub-pipeline is connected in series with the condenser (16) and the constant-frequency compressor (11), and the formed pipeline is respectively communicated with the greenhouse air outlet (1) and the greenhouse air inlet (17) of the gas diversion module.
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| CN201110401579.9A CN103145310B (en) | 2011-12-06 | 2011-12-06 | Sludge drying system combining solar energy and multi-heat-source heat pump |
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| CN201110401579.9A CN103145310B (en) | 2011-12-06 | 2011-12-06 | Sludge drying system combining solar energy and multi-heat-source heat pump |
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| CN103145310B true CN103145310B (en) | 2014-06-18 |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104003600A (en) * | 2014-05-08 | 2014-08-27 | 苏州奥泰斯环保科技发展有限公司 | Mobile wind-field sludge drying system |
| CN104193139A (en) * | 2014-09-16 | 2014-12-10 | 江苏金山环保工程集团有限公司 | Return air external recycle system for processing kitchen wastes and quickly drying sludge by using solar energy |
| CN104478191A (en) * | 2014-12-01 | 2015-04-01 | 北京高能时代环境技术股份有限公司 | Solar sludge drying treatment device and solar sludge drying treatment process |
| CN106630533A (en) * | 2016-11-21 | 2017-05-10 | 盐城工学院 | A solar energy sludge drying device |
| CN109399885A (en) * | 2018-11-14 | 2019-03-01 | 广东申菱环境系统股份有限公司 | A kind of workshop formula sludge drying system |
| CN109368977A (en) * | 2018-11-27 | 2019-02-22 | 江苏大学 | A kind of new type solar energy heat pump joint sludge drying system |
| CN111288785B (en) * | 2020-02-17 | 2022-04-15 | 北京建筑大学 | Switchable open-close type double-source heat pump drying system |
| CN111233524B (en) * | 2020-03-30 | 2021-09-24 | 兰州交通大学 | Earthworm compost and solar drying integrated workshop |
| CN114573211A (en) * | 2020-11-30 | 2022-06-03 | 无锡蓝湾资源再生科技有限公司 | Device for drying sludge by using new energy |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101618930A (en) * | 2009-07-28 | 2010-01-06 | 清华大学 | Mud drying system and use method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101618930A (en) * | 2009-07-28 | 2010-01-06 | 清华大学 | Mud drying system and use method thereof |
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