CN115321785A - Energy-recovery solar sludge drying technology and working method thereof - Google Patents
Energy-recovery solar sludge drying technology and working method thereof Download PDFInfo
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- CN115321785A CN115321785A CN202211017287.XA CN202211017287A CN115321785A CN 115321785 A CN115321785 A CN 115321785A CN 202211017287 A CN202211017287 A CN 202211017287A CN 115321785 A CN115321785 A CN 115321785A
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- 239000010802 sludge Substances 0.000 title claims abstract description 111
- 238000001035 drying Methods 0.000 title claims abstract description 69
- 238000000034 method Methods 0.000 title claims abstract description 13
- 238000005516 engineering process Methods 0.000 title abstract description 14
- 238000011084 recovery Methods 0.000 title abstract description 9
- 230000005855 radiation Effects 0.000 claims abstract description 17
- 238000007599 discharging Methods 0.000 claims abstract description 7
- 238000002156 mixing Methods 0.000 claims abstract description 4
- 238000010438 heat treatment Methods 0.000 claims description 9
- 239000013589 supplement Substances 0.000 claims description 6
- 239000008187 granular material Substances 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 4
- 238000004064 recycling Methods 0.000 abstract description 3
- 238000009423 ventilation Methods 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 5
- 238000005406 washing Methods 0.000 description 3
- 238000004332 deodorization Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001877 deodorizing effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000000855 fermentation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/13—Treatment of sludge; Devices therefor by de-watering, drying or thickening by heating
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/02—Odour removal or prevention of malodour
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/10—Energy recovery
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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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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Drying Of Solid Materials (AREA)
Abstract
The invention relates to the technical field of sludge drying, in particular to a solar sludge drying system and a working method thereof, wherein the solar sludge drying system comprises a sludge drying greenhouse, and drying heat is provided by solar radiation and an auxiliary heat source; the wet sludge feeding and dry sludge discharging and conveying device is connected with the sludge drying greenhouse; a sludge turning and back mixing machine for turning and transporting sludge in the greenhouse; the heat exchanger is respectively connected with the sludge drying greenhouse through a high-temperature wet air discharge pipeline and a low-temperature dry air introduction pipeline under the suction of the blower, and the sludge drying greenhouse further comprises an odor treatment device. The high-temperature humid air heat recovery technology not only can achieve the ventilation effect of a traditional fresh air system, but also achieves the purpose of recycling the heat of the system. The heat recovery technology can realize that fresh cold air is subjected to heat exchange before entering the system, the temperature is raised by 5-10 ℃, and the temperature can be equivalent to solar radiation heat, so that the use of auxiliary heat source equipment is reduced, the sludge drying yield is improved, and the sludge drying cost is further reduced.
Description
Technical Field
The invention relates to the technical field of sludge drying, in particular to a solar sludge drying device and a working method thereof.
Background
The solar sludge drying refers to drying treatment of sludge by using solar energy as a main energy source. The process is applied to the field of sludge treatment by means of the traditional greenhouse drying technology and the development of the modern automatic control technology, and mainly aims to utilize clean energy, namely solar energy, as a main energy source for sludge drying. Utilize solar energy radiation and outside auxiliary heat source, evaporate a large amount of moisture in the wet mud, moisture gets into in the air, and dry air becomes humid air in the system, becomes high temperature air from low temperature air and discharges the system again outside, and outside the system fresh air gushes into the system in, and continuous circulation, thereby wet mud moisture is constantly taken out and reaches the purpose of sludge drying.
Although the current solar drying technology is used in many projects and achieves some effects, the technology has some defects and shortcomings:
(1) the solar drying system evaporates a large amount of water in the sludge through solar radiation and an auxiliary heat source, and a fresh air system (a ventilation system) is used for discharging wet air out of the system. Moisture in the sludge is vaporized into steam after absorbing a large amount of heat and is directly discharged out of the system by a fresh air system, and a large amount of heat of the system is wasted due to the fact that the steam carries a large amount of latent heat of vaporization.
(2) The processing capacity of the solar drying technology is severely affected by seasons and weather, especially in winter and rainy seasons, the heat obtained by solar radiation is obviously insufficient and the external temperature in winter is low. The sludge drying process is the process of discharging the wet air in the system. Because the fresh air system takes out the damp and hot air in the system and simultaneously brings the same amount of dry and cold air outside the system into the system, the temperature of the system is reduced. On the other hand, the solar radiation energy is limited, and a large amount of auxiliary heat sources are needed to provide heat for the system in order to reach the set temperature and the designed drying yield, so that the cost of sludge treatment in winter is greatly increased; or a stable sludge treatment amount cannot be ensured, which may result in that the sludge cannot be treated in time, and the sludge is piled up for a long time to generate anaerobic fermentation and a large amount of toxic and harmful gas.
Disclosure of Invention
The invention aims to solve the problems and designs a solar sludge drying system which comprises a sludge drying greenhouse, wherein drying heat is provided by solar radiation and an auxiliary heat source; the wet sludge feeding and dry sludge discharging and conveying device is connected with the sludge drying greenhouse; a sludge turning and back mixing machine for turning and transporting sludge in the greenhouse; and the heat exchanger is respectively connected with the sludge drying greenhouse through a high-temperature wet air discharge pipeline and a low-temperature dry air introduction pipeline under the suction of the blower.
Preferably, a dry air inlet and a wet air outlet are connected to the heat exchanger.
Preferably, the high-temperature wet air is sent into the odor treatment device after being subjected to heat release through the heat exchanger.
The working method and the steps of the solar sludge drying system are as follows:
s1, conveying sludge to a sludge drying greenhouse by a wet sludge conveying device;
s2, heating sludge in the sludge drying greenhouse by solar radiation and an auxiliary heat source;
s3, under the suction action of an exhaust fan, hot and humid air enters a heat exchanger through a humid air pipeline, heat exchange is carried out between the hot and humid air and low-temperature fresh air sucked from the outside, and the humid air after heat release is exhausted from a humid air outlet;
s4, allowing external low-temperature dry air to pass through a heat exchanger through a dry air pipeline and then enter the greenhouse, heating the air after the air absorbs heat at the heat exchanger to form hot dry air, and then allowing the hot dry air to enter the sludge drying greenhouse through the dry air pipeline and form gas supplement and energy supplement for the greenhouse;
s5, heating the sludge in the sludge drying greenhouse by hot dry air, solar radiation and an auxiliary heat source;
s6, continuously drying the sludge along the length direction of the drying greenhouse, continuously turning and throwing the sludge by a turner to oxygenate and aerate the sludge and push the sludge to move forwards to enter a dry sludge outlet device;
and S7, repeating the circulation process.
Compared with the prior art, the invention has the advantages that:
1. the high-temperature and humid air heat recovery technology not only can achieve the ventilation effect of a traditional fresh air system (air circulation system), but also achieves the purpose of recycling the heat of the system. In winter, fresh cold air can be subjected to heat exchange before entering the system by utilizing a heat recovery technology, the temperature can be increased by 5-10 ℃, and even can be equal to solar radiation heat, so that the use of auxiliary heat source equipment is reduced, the sludge drying yield is greatly increased, and the sludge drying cost is further reduced.
2. Through recycling heat, a stable system temperature can be provided for the system, the sludge treatment capacity is stably improved, the treatment capacity of wet sludge in winter can be better matched, sludge accumulation is avoided, the occupied area is saved, and the sludge drying treatment cost is reduced.
3. The washing device has the function of washing the heat exchanger, dust or scale can be accumulated on the surface of the heat exchanger after a long time, so that the heat transfer efficiency can be influenced, and the cleanness and the heat exchange effect of a heat exchange surface can be effectively guaranteed through regular washing.
4. Through hot-blast collection pipeline, after the heat recovery through the heat exchanger, can be with waste gas high altitude emission or get into deodorization system, made things convenient for follow-up foul smell to collect and handle.
5. The power source for gas exchange of the deodorizing exhaust fan existing in the original system design is utilized, the use cost is hardly increased, and a large amount of heat is obtained.
Drawings
FIG. 1 is a schematic diagram of the present invention;
FIG. 2 is a process diagram of the present invention;
in the figure: 1. the system comprises a sludge drying greenhouse, 2, a sludge inlet system, 3, a sludge outlet system, 4, a turner, 5, a heat exchanger, 6, a blower, 7, an exhaust pipeline, 8, a fresh air pipeline and 9, an auxiliary heat source.
Detailed Description
The invention relates to a solar sludge drying system, which comprises a sludge drying greenhouse, wherein drying heat is provided by solar radiation and an auxiliary heat source; the wet sludge feeding and dry sludge discharging and conveying device is connected with the sludge drying greenhouse; a sludge turning and back mixing machine for turning and transporting sludge in the greenhouse; and the heat exchanger is respectively connected with the sludge drying greenhouse through a high-temperature wet air discharge pipeline and a low-temperature dry air introduction pipeline. The heat exchanger is connected with a dry air inlet and a wet air outlet. Also comprises an odor treatment device.
The working method of the solar sludge drying system comprises the following steps:
s1, conveying sludge to a sludge drying greenhouse by a wet sludge conveying device;
s2, heating sludge in the sludge drying greenhouse by solar radiation and an auxiliary heat source;
s3, under the suction action of an exhaust fan, hot and humid air enters a heat exchanger through a humid air pipeline, heat exchange is carried out between the hot and humid air and low-temperature fresh air sucked from the outside, and the humid air after heat release is exhausted from a humid air outlet;
s4, allowing external low-temperature dry air to pass through a heat exchanger through a dry air pipeline and then enter the greenhouse, heating the air after the air absorbs heat at the heat exchanger to form hot dry air, and then allowing the hot dry air to enter the sludge drying greenhouse through the dry air pipeline and form gas supplement and energy supplement for the greenhouse;
s5, heating the sludge in the sludge drying greenhouse by hot dry air, solar radiation and an auxiliary heat source;
s6, continuously drying the sludge along the length direction of the drying greenhouse, continuously turning and throwing the sludge by a turner to oxygenate and aerate the sludge and push the sludge to move forwards to enter a dry sludge outlet device;
and S7, repeating the circulation process.
The working principle of the solar sludge drying device is as follows:
the heat recovery technology operates on the principle that the two gas streams have a temperature difference, and then heat transfer occurs on the dividing wall heat exchange surface of the heat exchanger. The fresh air system is combined with the air exhaust and deodorization system, the air flowing direction in the greenhouse is opposite to the sludge running direction, and countercurrent is formed, so that sludge drying is facilitated. The humid and hot air discharged from the greenhouse and the cold and dry air entering the greenhouse are not crossed in the traditional solar sludge drying process, only the cold and dry air enters the greenhouse to be heated and take away water vapor to become humid and hot air, and the air is discharged out of a system. In the patent technology, two air streams of cold and hot air enter a heat exchanger in a crossed mode, and heat of fresh air (cold and dry air) and exhaust air (damp and hot air) is exchanged, namely the temperature is transferred from a hotter side to a cooler side, so that not only is the heat in the exhaust air recovered, but also odor and moisture are prevented from being transferred. A large number of experiments and practices prove that in winter, cold air outside the system can exchange heat before entering the system through a heat recovery technology, the temperature can be increased by 5-10 ℃, and the part of heat recovered in winter often reaches or exceeds the heat input into the system through solar radiation. Thereby reducing the energy loss in the system and saving the operating cost of the auxiliary heat source.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be covered by the present invention within the technical scope of the present invention, and the technical solutions and novel concepts according to the present invention should be added with equivalent alternatives or modifications.
Claims (4)
1. A solar sludge drying system is characterized by comprising
The sludge drying greenhouse is characterized in that solar radiation and an auxiliary heat source are used as heating devices;
the wet sludge feeding device is connected with the sludge drying greenhouse;
the dry sludge discharging and conveying device is connected with the sludge drying greenhouse;
the sludge turning and back mixing device runs in the greenhouse and drives the sludge to granulate and convey;
and the heat exchanger is respectively connected with the sludge drying greenhouse through a wet air pipeline and a dry air pipeline.
2. The solar sludge drying device of claim 1, wherein: the heat exchanger is connected with a dry air inlet and a wet air outlet.
3. The solar sludge drying system of claim 1 further comprising an odor treatment device.
4. The working method of the solar sludge drying system according to claim 2, characterized by comprising the following steps:
s1, conveying sludge to a sludge drying greenhouse by a wet sludge conveying device;
s2, heating sludge in the sludge drying greenhouse by solar radiation and an auxiliary heat source;
s3, under the suction action of an exhaust fan, hot and humid air enters a heat exchanger through a humid air pipeline, heat exchange is carried out between the hot and humid air and low-temperature fresh air sucked from the outside, and the humid air after heat release is exhausted from a humid air outlet;
s4, allowing external low-temperature dry air to pass through a heat exchanger through a dry air pipeline and then enter the greenhouse, allowing the part of air to absorb heat at the heat exchanger and then rise in temperature to form hot dry air, and allowing the hot dry air to enter the sludge drying greenhouse through the dry air pipeline and form gas supplement and energy supplement for the greenhouse;
s5, heating the sludge in the sludge drying greenhouse by hot dry air, solar radiation and an auxiliary heat source;
s6, continuously drying the sludge along the length direction of the drying greenhouse, continuously turning and throwing the sludge by a turner to oxygenate and aerate the sludge and push the sludge to move forwards to enter a device 3, and discharging the dried sludge out of the device;
and S7, repeating the circulation process.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2022107168775 | 2022-06-23 | ||
| CN202210716877 | 2022-06-23 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115321785A true CN115321785A (en) | 2022-11-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211017287.XA Pending CN115321785A (en) | 2022-06-23 | 2022-08-24 | Energy-recovery solar sludge drying technology and working method thereof |
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| Country | Link |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102745877A (en) * | 2012-06-06 | 2012-10-24 | 石文政 | Processing apparatus for drying sludge by utilizing waste heat of draught fan and method for using the same |
| CN202717683U (en) * | 2012-08-10 | 2013-02-06 | 北京中电加美环保科技股份有限公司 | Sludge drying device |
| CN204803202U (en) * | 2015-01-07 | 2015-11-25 | 广州新致晟环保科技机械设备有限公司 | Sludge drying device |
| CN105776811A (en) * | 2016-05-05 | 2016-07-20 | 深圳市怡泰水处理有限公司 | Sludge dewatering method and device |
| CN108800164A (en) * | 2018-07-09 | 2018-11-13 | 天津壹新环保工程有限公司 | Sludge drying and incineration heat balance treatment system and method |
| CN211921294U (en) * | 2020-03-05 | 2020-11-13 | 上海尚析环保设备有限公司 | Greenhouse sludge drying device utilizing sunlight |
-
2022
- 2022-08-24 CN CN202211017287.XA patent/CN115321785A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102745877A (en) * | 2012-06-06 | 2012-10-24 | 石文政 | Processing apparatus for drying sludge by utilizing waste heat of draught fan and method for using the same |
| CN202717683U (en) * | 2012-08-10 | 2013-02-06 | 北京中电加美环保科技股份有限公司 | Sludge drying device |
| CN204803202U (en) * | 2015-01-07 | 2015-11-25 | 广州新致晟环保科技机械设备有限公司 | Sludge drying device |
| CN105776811A (en) * | 2016-05-05 | 2016-07-20 | 深圳市怡泰水处理有限公司 | Sludge dewatering method and device |
| CN108800164A (en) * | 2018-07-09 | 2018-11-13 | 天津壹新环保工程有限公司 | Sludge drying and incineration heat balance treatment system and method |
| CN211921294U (en) * | 2020-03-05 | 2020-11-13 | 上海尚析环保设备有限公司 | Greenhouse sludge drying device utilizing sunlight |
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