CN113526824A - Heat energy and solar energy linkage drying sludge treatment equipment and process - Google Patents
Heat energy and solar energy linkage drying sludge treatment equipment and process Download PDFInfo
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- CN113526824A CN113526824A CN202110763895.4A CN202110763895A CN113526824A CN 113526824 A CN113526824 A CN 113526824A CN 202110763895 A CN202110763895 A CN 202110763895A CN 113526824 A CN113526824 A CN 113526824A
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- 239000010802 sludge Substances 0.000 title claims abstract description 230
- 238000001035 drying Methods 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 title claims abstract description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 98
- 239000008399 tap water Substances 0.000 claims abstract description 23
- 235000020679 tap water Nutrition 0.000 claims abstract description 23
- 238000000926 separation method Methods 0.000 claims abstract description 13
- 239000012141 concentrate Substances 0.000 claims abstract description 3
- 230000018044 dehydration Effects 0.000 claims description 26
- 238000006297 dehydration reaction Methods 0.000 claims description 26
- 238000007599 discharging Methods 0.000 claims description 22
- 238000001556 precipitation Methods 0.000 claims description 14
- 239000008394 flocculating agent Substances 0.000 claims description 9
- 238000010979 pH adjustment Methods 0.000 claims description 6
- 230000007935 neutral effect Effects 0.000 claims description 5
- 230000001376 precipitating effect Effects 0.000 claims description 5
- 238000001125 extrusion Methods 0.000 claims description 3
- 238000000465 moulding Methods 0.000 claims description 3
- 230000005855 radiation Effects 0.000 claims description 3
- 238000005265 energy consumption Methods 0.000 abstract description 11
- 238000004140 cleaning Methods 0.000 abstract description 2
- 239000002244 precipitate Substances 0.000 abstract 1
- 208000005156 Dehydration Diseases 0.000 description 22
- 239000005708 Sodium hypochlorite Substances 0.000 description 6
- 238000011084 recovery Methods 0.000 description 6
- SUKJFIGYRHOWBL-UHFFFAOYSA-N sodium hypochlorite Chemical compound [Na+].Cl[O-] SUKJFIGYRHOWBL-UHFFFAOYSA-N 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 244000005700 microbiome Species 0.000 description 5
- 239000007787 solid Substances 0.000 description 5
- 230000003834 intracellular effect Effects 0.000 description 4
- 239000006228 supernatant Substances 0.000 description 4
- 239000002699 waste material Substances 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 241000894006 Bacteria Species 0.000 description 2
- 241000233866 Fungi Species 0.000 description 2
- 210000000170 cell membrane Anatomy 0.000 description 2
- 238000005345 coagulation Methods 0.000 description 2
- 230000015271 coagulation Effects 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 230000003311 flocculating effect Effects 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007791 dehumidification Methods 0.000 description 1
- 238000003795 desorption Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000000265 homogenisation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000011085 pressure filtration Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000004065 wastewater treatment Methods 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
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
-
- 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
-
- 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
- C02F11/004—Sludge detoxification
-
- 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
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
- C02F11/127—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering by centrifugation
-
- 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
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S20/00—Solar heat collectors specially adapted for particular uses or environments
- F24S20/30—Solar heat collectors for heating objects, e.g. solar cookers or solar furnaces
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S20/00—Supporting structures for PV modules
- H02S20/30—Supporting structures being movable or adjustable, e.g. for angle adjustment
- H02S20/32—Supporting structures being movable or adjustable, e.g. for angle adjustment specially adapted for solar tracking
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S40/00—Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
- H02S40/20—Optical components
- H02S40/22—Light-reflecting or light-concentrating means
-
- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/40—Solar thermal energy, e.g. solar towers
-
- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/52—PV systems with concentrators
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- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Sustainable Development (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Sustainable Energy (AREA)
- Thermal Sciences (AREA)
- Combustion & Propulsion (AREA)
- General Engineering & Computer Science (AREA)
- Treatment Of Sludge (AREA)
- Drying Of Solid Materials (AREA)
Abstract
The invention discloses heat energy and solar energy linkage sludge drying treatment equipment and process, and belongs to the technical field of water supply cleaning. The heat energy and solar energy linkage sludge drying treatment equipment comprises a sludge discharge tank, a sludge concentration tank, a homogenizing tank, a dehydrator, a low-temperature drier and a sludge drying bin which are distributed in sequence, wherein the sludge discharge tank primarily precipitates and separates sludge in tap water, the sludge concentration tank concentrates the primarily precipitated and separated sludge, the homogenizing tank adjusts the pH of the concentrated sludge, the dehydrator mechanically dehydrates the pH-adjusted sludge, the low-temperature drier shapes and dehydrates the mechanically dehydrated sludge, the sludge drying bin collects the dried sludge, the sludge is delivered to be treated, the original sludge with the water content of 99.6% -99.2% is made into a sludge cake with the water content of 8% -12%, the water separation volume of the sludge is large, the energy consumption of the device is low, the secondary pollution degree of the sludge is low, the sludge is recycled in a centralized manner, and the sludge is convenient to manage and consume in order.
Description
Technical Field
The invention belongs to the technical field of water supply cleaning, and particularly relates to heat energy and solar energy linkage sludge drying treatment equipment and a process.
Background
In order to facilitate further treatment and disposal of sludge, the "Notification for enhancing the sludge pollution control work in urban wastewater treatment plants" of the environmental protection department 157 requires dehydration of sludge to a water content of 50% or less for the purpose of storage (i.e., non-treatment) of sludge to be shipped to the factory.
However, deep dehydration equipment which has low energy consumption, small additive dosage, large capacity and can continuously treat the sludge is still lacking at present. The plate-frame type deep dehydration processor in the current market can meet related requirements in the aspect of dehydration, but has the defects of longer squeezing time, incapability of continuously discharging, small processing capacity of single equipment, shorter service life of the equipment, incomplete technology and the like, so that the further popularization and the use of the plate-frame type deep dehydration processor are limited.
The water content in the sludge is roughly classified into four types: interstitial water, capillary bound water, surface adsorbed water and intracellular water.
Interstitial water (also called "free water"): the sludge is surrounded by sludge solids, is not directly combined with the solids, has weak acting force, is easy to separate, and is a main object of sludge concentration.
Capillary bound water: the water surrounding the fine sludge particles, including wedge-shaped capillary bound water on the particle contact surface, and felt fine bound water filling the fissures of the solids themselves, require high mechanical forces to separate.
Surface adsorption of water: water adsorbed on the surface of the sludge under the action of the surface tension of the sludge. The removal of surface adsorbed water is difficult, particularly the surface activity and the residual force field intensity of sludge after fine particles or biological treatment are high, the adhesion force is large, and the coagulation method is commonly used to achieve the coagulation effect so as to separate the sludge solid from water.
Intracellular water: enclosed in the cell membrane of the microorganism, bound tightly to the solid, which must be destroyed in order to be removed. Cannot be removed by mechanical means, and other methods are adopted to destroy cell membranes, so that the internal water is changed into external liquid for removal. The surface adsorbed water and intracellular water account for about 10%.
Capillary bound water, surface adsorbed water and intracellular water are collectively called as 'bound water', the surfaces of the bound water are provided with strong negative electron packages, and the latter two kinds of water cannot be separated out by pressure filtration in a physical mode.
The dewatering performance of the sludge is related to the particle, specific gravity, viscosity and PAM dosage of the sludge.
Disclosure of Invention
1. Technical scheme
In order to solve the above problems, the present invention adopts the following technical solutions.
The heat energy and solar energy linkage drying sludge treatment equipment comprises a sludge discharge tank, a sludge concentration tank, a homogenizing tank, a dehydrator, a low-temperature dryer and a drying sludge bin which are distributed in sequence.
The sludge discharge tank is used for primarily precipitating and separating sludge in the tap water. Tap water on the upper layer can be used for supplying water, sludge on the bottom layer is separated from the tap water on the upper layer and then is used for dehydration treatment, and the water content of the sludge on the bottom layer is 99.6% -99.2%.
And the sludge concentration tank is used for concentrating the sludge subjected to primary precipitation and separation. And (2) carrying out precipitation or centrifugal separation on the bottom layer sludge separated from tap water, reducing the water content of the sludge to 97-98%, and separating most of interstitial water in the sludge through precipitation and concentration, wherein the interstitial water accounts for about 70% of the total amount of the water in the sludge, so that the volume of the water in the sludge can be greatly reduced.
And the homogenizing tank adjusts the pH value of the concentrated sludge. The sludge in the tap water is generally alkaline, sodium hypochlorite is introduced into the homogenizing tank, and the alkaline sludge is neutralized to be neutral. Meanwhile, the sodium hypochlorite can kill bacteria and fungi in the sludge, and effectively avoid propagation and expansion of harmful microorganisms in the sludge.
The dehydrator mechanically dehydrates the sludge after the pH adjustment. Dehydrating the sludge with the water content of 97-98% to the water content of 78-82%. The capillary bound water accounts for about 20% of the total water content in the sludge. Most of the capillary bound water in the sludge is separated by means of mechanical pressing.
And the low-temperature drier is used for molding and dehydrating the sludge subjected to mechanical dehydration at a low temperature. After the sludge is dried at low temperature, the water content is reduced to 8-12%. The low-temperature dryer effectively avoids direct contact of a heating medium and sludge by taking hot steam as a medium, and has the advantages of easy heat energy recovery and relatively low energy consumption. The working temperature of the low-temperature dryer is 48-80 ℃, so that the odor caused by decomposition of part of volatile substances in the sludge by heat is effectively avoided, the pollution of tail gas is increased, the tail gas can be discharged to reach the standard after being treated, the difficulty of tail gas treatment and heat energy recovery is increased, and the treatment energy consumption and other expenses are higher.
And the dried sludge bin collects the dried sludge to be sent for treatment.
Further, the device also comprises a flocculating agent machine. The flocculating agent machine can put flocculating agent into the dehydrator to deposit residual sludge. The flocculating agent is used for flocculating and precipitating residual free mud in the water containing the sludge, so that the sludge is better separated from water, and the next step of dehydration is facilitated.
Furthermore, the solar auxiliary heat engine is also included. The solar energy auxiliary heat machine converts solar energy into heat energy to provide auxiliary heat energy for the low-temperature drying machine. The low-temperature dryer can fully utilize solar clean energy and reduce municipal power supply operation energy consumption. When the solar energy meets the energy requirement for sludge drying, the solar energy is independently provided, and if the solar energy is insufficient in rainy days, the ultra-high temperature air source heat pump integrated in the low-temperature drying equipment independently provides the energy requirement for drying, and the two systems are independently operated. The use method of the solar auxiliary heat engine comprises the following steps:
s1, absorbing the heat energy of the sun by using the photovoltaic panel and converting the heat energy into electric energy;
s2, judging the direct solar radiation direction;
s3, enabling the back of the photovoltaic panel to be irradiated by sunlight through the reflecting plate;
s4, supplying power to an adjusting mechanism by the electric energy converted from the solar energy, wherein the adjusting mechanism is used for adjusting the position of the reflecting plate;
s5, the adjusting mechanism intermittently outputs the action;
s6, the output action of the adjusting mechanism enables the angle of the reflecting plate relative to the photovoltaic panel to deflect, and the angle of the reflecting plate relative to the photovoltaic panel enables the back of the photovoltaic panel to be always directly irradiated by sunlight;
s7, when no sunlight is directly irradiated, the adjusting mechanism returns to the original state to adjust the reflecting plate.
Further, the dehydrator is a multiple circular plate dehydrator. The multiple circular plate type dehydrator comprises a plurality of dehydration extrusion circular plates. The efficiency of mechanical dehydration is effectively improved.
The invention also provides a heat energy and solar energy linkage dried sludge treatment process, which uses heat energy and solar energy linkage dried sludge treatment equipment and comprises
Step A, discharging tap water with sludge discharged by a water plant into a sludge discharge tank for primary precipitation separation. The water content of the sludge is 99.6-99.2%.
And step B, discharging the sludge subjected to preliminary precipitation separation into a sludge concentration tank, and concentrating to remove water. The water content of the sludge is reduced to 97-98%, and most of interstitial water in the sludge is separated through precipitation and concentration.
And C, discharging the sludge subjected to the concentration treatment into a homogenizing tank, introducing sodium hypochlorite into the homogenizing tank, and adjusting the pH value of the sludge to be neutral. Effectively avoids the propagation and expansion of harmful microorganisms in the sludge and is convenient for the subsequent recycling of the sludge.
And D, discharging the concentrated sludge after pH adjustment into a dehydrator, performing mechanical dehydration, and preliminarily draining the water of the concentrated sludge. The dehydrator is a multi-circular-plate dehydrator, and the water content of the sludge is reduced to 78-82%. Most of the capillary bound water in the sludge is separated out.
And E, discharging the concentrated sludge with the moisture preliminarily drained into a low-temperature drier, and forming the concentrated sludge before entering the low-temperature drier to ensure that each part of the concentrated sludge is uniformly heated. The drying temperature of the low-temperature drier is 48-56 ℃ (return air)/65-80 ℃ (inlet air).
And F, discharging the sludge subjected to low-temperature drying and dehydration into a dried sludge bin, and collecting.
Further, the dehydrator adds a flocculant to the dehydrator while mechanically dehydrating the concentrated sludge. The sludge dissociated in the water is flocculated and precipitated, and the separation degree of the sludge and the water is improved.
Furthermore, the low-temperature drier converts solar energy into heat energy through a solar energy auxiliary heat machine, and the heat energy is used as auxiliary heat energy for drying the concentrated sludge. Reduce power supply energy consumption and reduce cost.
Further, after the dewatering machine is filled with the concentrated sludge with the adjusted pH value, the excessive concentrated sludge and the attached tap water overflow and are discharged back to the sludge discharge pool. Effectively avoids the waste of materials and improves the repeated utilization rate.
Further, the dehydrator mechanically dehydrates the pH-adjusted concentrated sludge, and then discharges the removed tap water back to the sludge discharge tank. Effectively avoids the waste of materials and improves the repeated utilization rate.
2. Advantageous effects
Compared with the prior art, the invention has the advantages that:
(1) after sludge in tap water is subjected to precipitation, concentration, homogenization, mechanical dehydration and low-temperature drying dehydration, the original sludge with the water content of 99.6-99.2% is prepared into a sludge cake with the water content of 8-12%, the water separation volume of the sludge is large, the energy consumption of the device is low, the secondary pollution degree of the sludge is low, the sludge is subjected to centralized recovery treatment, and the management and the ordered consumption are facilitated.
(2) The hydroextractor overflows the blowdown and returns the mud discharging pool with too much concentrated sludge and subsidiary running water after letting in the concentrated sludge who has adjusted pH, and the hydroextractor carries out mechanical dehydration back to the concentrated sludge who has adjusted pH, discharges the running water of desorption back to the mud discharging pool, effectively avoids the waste of material, improves material reuse rate.
Drawings
FIG. 1 is a schematic flow diagram of the present invention;
fig. 2 is a schematic plan view of the present invention.
The reference numbers in the figures illustrate:
the system comprises a sludge discharge tank 1, a sludge concentration tank 2, a homogenizing tank 3, a dehydrator 4, a low-temperature drier 5, a dried sludge bin 6, a flocculant machine 7 and a solar auxiliary heat machine 8.
Detailed Description
Please refer to the heat energy solar energy linkage sludge drying treatment device of fig. 1, which comprises a sludge discharging tank 1, a sludge concentrating tank 2, a homogenizing tank 3, a dewatering machine 4, a low temperature drying machine 5, a dried sludge bin 6, a flocculating agent machine 7 and a solar energy auxiliary heat machine 8, which are distributed in sequence.
The sludge discharge tank 1 is used for primarily precipitating and separating sludge in tap water. Tap water on the upper layer can be used for supplying water, sludge on the bottom layer is separated from the tap water on the upper layer and then is used for dehydration treatment, and the water content of the sludge on the bottom layer is 99.6% -99.2%. And collecting the supernatant in the sludge discharge tank 1, and pumping the collected supernatant to an off-plant municipal sewage pipe network by using a water pump.
The sludge concentration tank 2 concentrates the sludge which is primarily precipitated and separated. And (2) carrying out precipitation or centrifugal separation on the bottom layer sludge separated from tap water, reducing the water content of the sludge to 97-98%, and separating most of interstitial water in the sludge through precipitation and concentration, wherein the interstitial water accounts for about 70% of the total amount of the water in the sludge, so that the volume of the water in the sludge can be greatly reduced. The supernatant of the sludge concentration tank 2 is discharged back to the sludge discharge tank 1.
And the homogenizing tank 3 adjusts the pH value of the concentrated sludge. The sludge in the tap water is generally alkaline, sodium hypochlorite is introduced into the homogenizing tank 3, and the alkaline sludge is neutralized to be neutral. Meanwhile, the sodium hypochlorite can kill bacteria and fungi in the sludge, and effectively avoid propagation and expansion of harmful microorganisms in the sludge.
The dehydrator 4 mechanically dehydrates the sludge after pH adjustment. Dehydrating the sludge with the water content of 97-98% to the water content of 78-82%. The capillary bound water accounts for about 20% of the total water content in the sludge. Most of the capillary bound water in the sludge is separated by means of mechanical pressing.
The dehydrator 4 is a multiple circular plate dehydrator. The multiple circular plate type dehydrator comprises a plurality of dehydration extrusion circular plates. The efficiency of mechanical dehydration is effectively improved.
When the dehydrator 4 operates, the flocculant machine 7 may put a flocculant into the dehydrator 4 to precipitate residual sludge. The flocculating agent is used for flocculating and precipitating residual free mud in the water containing the sludge, so that the sludge is better separated from water, and the next step of dehydration is facilitated.
The low-temperature drier 5 is used for molding, drying and dehydrating the sludge after mechanical dehydration at low temperature. After the sludge is dried at low temperature, the water content is reduced to 8-12%. The low-temperature dryer 5 effectively avoids direct contact between a heating medium and sludge by taking hot steam as a medium, and has the advantages of easy heat energy recovery and relatively low energy consumption. The working temperature of the low-temperature dryer 5 is 48-80 ℃, so that the odor caused by decomposition of part of volatile substances in the sludge by heat is effectively avoided, the pollution of tail gas is increased, the tail gas can be discharged to reach the standard after being treated, the difficulty of tail gas treatment and heat energy recovery is increased, and the treatment energy consumption and other costs are high.
The solar energy auxiliary heat engine 8 converts solar energy into heat energy to provide auxiliary heat energy for the low-temperature drying machine 5. The low-temperature dryer 5 can fully utilize solar clean energy and reduce municipal power supply operation energy consumption. When the solar energy meets the energy requirement for sludge drying, the solar energy is independently provided, and if the solar energy is insufficient in rainy days, the ultra-high temperature air source heat pump integrated in the low-temperature drying equipment independently provides the energy requirement for drying, and the two systems are independently operated.
When the solar auxiliary heat engine 8 works, the thermal circulation water pump is started to circulate water in the heat-preservation and heat-collection water tank in the solar heating pipe through the connecting pipeline, and the solar heat-collection pipe absorbs solar energy and converts the solar energy into heat energy to gradually heat the circulating water in the pipeline. According to calculation, about 2 hours, about 2t of normal temperature water can be heated to more than 80 ℃. Once the water temperature reaches the starting condition, the hot air blower of the thermal evaporator is automatically started to supply heat to the low-temperature drier 5; the original heat supply heat pump can stop running to achieve the purpose of energy saving, and the energy saving effect is very obvious at the moment.
The use method of the solar auxiliary heat engine 8 comprises the following steps:
s1, absorbing the heat energy of the sun by using the photovoltaic panel and converting the heat energy into electric energy;
s2, judging the direct solar radiation direction;
s3, enabling the back of the photovoltaic panel to be irradiated by sunlight through the reflecting plate;
s4, supplying power to an adjusting mechanism by the electric energy converted from the solar energy, wherein the adjusting mechanism is used for adjusting the position of the reflecting plate;
s5, the adjusting mechanism intermittently outputs the action;
s6, the output action of the adjusting mechanism enables the angle of the reflecting plate relative to the photovoltaic panel to deflect, and the angle of the reflecting plate relative to the photovoltaic panel enables the back of the photovoltaic panel to be always directly irradiated by sunlight;
s7, when no sunlight is directly irradiated, the adjusting mechanism returns to the original state to adjust the reflecting plate.
When the low-temperature drier 5 dries sludge, the energy recovery effect is achieved through the condensation of damp and hot air. The low-temperature tap water is mainly used as a refrigerant of the condenser, and the moist hot air at about 70 ℃ is cooled to about 40 ℃ through the water condenser, so that the moist hot air is rapidly condensed, and condensed water is discharged. After dehumidification, dry air at about 40 ℃ is used as an air inlet of a hot air blower of the heat evaporator, so that heat is recycled.
And the dried sludge bin 6 collects the dried sludge to be sent for treatment.
A heat energy and solar energy linkage sludge drying treatment process comprises
Step A, discharging tap water with sludge discharged by a water plant into a sludge discharge tank 1 for primary precipitation separation. The water content of the sludge is 99.6-99.2%.
And step B, discharging the sludge subjected to preliminary precipitation separation into a sludge concentration tank 2, and concentrating and dewatering. The water content of the sludge is reduced to 97-98%, and most of interstitial water in the sludge is separated through precipitation and concentration. The supernatant liquor of the sludge concentration tank 2 is discharged into the sludge discharge tank 1 for reuse.
And C, discharging the sludge subjected to the concentration treatment into a homogenizing tank 3, introducing sodium hypochlorite into the homogenizing tank 3, and adjusting the pH value of the sludge to be neutral. Effectively avoids the propagation and expansion of harmful microorganisms in the sludge and is convenient for the subsequent recycling of the sludge.
And D, discharging the concentrated sludge after pH adjustment into a dehydrator 4, performing mechanical dehydration, and preliminarily draining the water of the concentrated sludge. The dehydrator 4 is a multi-circular-plate dehydrator, and the water content of the sludge is reduced to 78-82%. Most of the capillary bound water in the sludge is separated, and the dehydrator 4 adds the flocculant into the dehydrator 4 while mechanically dehydrating the concentrated sludge. The sludge dissociated in the water is flocculated and precipitated, and the separation degree of the sludge and the water is improved. The dehydrator 4 overflows and discharges excessive concentrated sludge and accompanying tap water back to the sludge discharge tank 1 after introducing the concentrated sludge with the adjusted pH. The dehydrator 4 discharges the removed tap water back to the sludge discharge tank 1 after mechanically dehydrating the pH-adjusted concentrated sludge. Effectively avoids the waste of materials and improves the repeated utilization rate.
And E, discharging the concentrated sludge with the primarily drained water into the low-temperature drier 5, and forming the concentrated sludge before entering the low-temperature drier 5 to ensure that each part of the concentrated sludge is uniformly heated. The drying temperature of the low-temperature drier 5 is 48-56 ℃ (return air)/65-80 ℃ (inlet air). The low-temperature drier 5 converts solar energy into heat energy through the solar auxiliary heat engine 8, and the heat energy is used as auxiliary heat energy for drying and concentrating sludge. Reduce power supply energy consumption and reduce cost.
And F, discharging the sludge subjected to low-temperature drying and dehydration into a dried sludge bin 6, and collecting.
Claims (9)
1. Heat energy solar energy linkage mummification sludge treatment equipment which characterized in that: comprises a sludge discharge tank (1), a sludge concentration tank (2), a homogenizing tank (3), a dehydrator (4), a low-temperature drier (5) and a dried sludge bin (6) which are distributed in sequence;
the sludge discharge pool (1) is used for primarily precipitating and separating sludge in tap water;
the sludge concentration tank (2) concentrates the sludge which is primarily precipitated and separated;
the homogenizing tank (3) adjusts the pH value of the concentrated sludge;
the dehydrator (4) mechanically dehydrates the sludge after pH adjustment;
the low-temperature drier (5) is used for molding and dehydrating the sludge subjected to mechanical dehydration at a low temperature;
the dried sludge bin (6) collects the dried sludge to be sent for treatment.
2. The thermal energy and solar energy linkage drying sludge treatment equipment according to claim 1, characterized in that: also comprises a flocculating agent machine (7); the flocculating agent machine (7) can put flocculating agent into the dewatering machine (4) to deposit residual sludge.
3. The thermal energy and solar energy linkage drying sludge treatment equipment according to claim 1, characterized in that: also comprises a solar auxiliary heat engine (8); the solar energy auxiliary heat machine (8) converts solar energy into heat energy to provide auxiliary heat energy for the low-temperature drier (5); the use method of the solar auxiliary heat engine (8) comprises the following steps: s1, absorbing the heat energy of the sun by using the photovoltaic panel and converting the heat energy into electric energy; s2, judging the direct solar radiation direction; s3, enabling the back of the photovoltaic panel to be irradiated by sunlight through the reflecting plate; s4, supplying power to an adjusting mechanism by the electric energy converted from the solar energy, wherein the adjusting mechanism is used for adjusting the position of the reflecting plate; s5, the adjusting mechanism intermittently outputs the action; s6, the output action of the adjusting mechanism enables the angle of the reflecting plate relative to the photovoltaic panel to deflect, and the angle of the reflecting plate relative to the photovoltaic panel enables the back of the photovoltaic panel to be always directly irradiated by sunlight; s7, when no sunlight is directly irradiated, the adjusting mechanism returns to the original state to adjust the reflecting plate.
4. The thermal energy and solar energy linkage drying sludge treatment equipment according to claim 1, characterized in that: the dehydrator (4) is a multi-circular-plate dehydrator; the multiple circular plate type dehydrator comprises a plurality of dehydration extrusion circular plates.
5. The heat energy and solar energy linkage sludge drying treatment process uses the heat energy and solar energy linkage sludge drying treatment equipment according to any one of claims 1 to 4, and is characterized in that: comprises that
Step A, discharging tap water with sludge discharged by a water plant into a sludge discharge tank (1) for primary precipitation separation;
step B, discharging the sludge subjected to preliminary precipitation separation into a sludge concentration tank (2), and concentrating and dewatering;
c, discharging the sludge after the concentration treatment into a homogenizing pool (3), and adjusting the pH value of the sludge to be neutral;
d, discharging the concentrated sludge after pH adjustment into a dehydrator (4), performing mechanical dehydration, and preliminarily draining the water of the concentrated sludge;
e, discharging the concentrated sludge with the primarily drained water into a low-temperature dryer (5), and drying and dehydrating the sludge at the low temperature of 48-80 ℃;
and F, discharging the sludge subjected to low-temperature drying and dehydration into a dried sludge bin (6) and collecting.
6. The thermal energy and solar energy linkage drying sludge treatment process according to claim 5, characterized in that: the dehydrator (4) adds a flocculant to the dehydrator (4) while mechanically dehydrating the concentrated sludge.
7. The thermal energy and solar energy linkage drying sludge treatment process according to claim 5, characterized in that: the low-temperature drier (5) converts solar energy into heat energy through the solar auxiliary heat engine (8) to be used as auxiliary heat energy for drying and concentrating sludge.
8. The thermal energy and solar energy linkage drying sludge treatment process according to claim 5, characterized in that: after the pH-adjusted concentrated sludge is introduced into the dehydrator (4), excessive concentrated sludge and tap water attached to the sludge are overflowed and discharged back to the sludge discharge pool (1).
9. The thermal energy and solar energy linkage drying sludge treatment process according to claim 5, characterized in that: the dehydrator (4) discharges the removed tap water back to the sludge discharge tank (1) after mechanically dehydrating the concentrated sludge with the adjusted pH value.
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