CN110746081A - Sludge drying system with gradient utilization of heat source energy - Google Patents
Sludge drying system with gradient utilization of heat source energy Download PDFInfo
- Publication number
- CN110746081A CN110746081A CN201911184016.1A CN201911184016A CN110746081A CN 110746081 A CN110746081 A CN 110746081A CN 201911184016 A CN201911184016 A CN 201911184016A CN 110746081 A CN110746081 A CN 110746081A
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- sludge
- disc dryer
- steam
- communicated
- preheater
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- 239000010802 sludge Substances 0.000 title claims abstract description 75
- 238000001035 drying Methods 0.000 title claims abstract description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 13
- 239000002918 waste heat Substances 0.000 abstract description 4
- 239000007789 gas Substances 0.000 description 8
- 230000001105 regulatory effect Effects 0.000 description 3
- 229920006395 saturated elastomer Polymers 0.000 description 3
- 239000010865 sewage Substances 0.000 description 3
- 238000004064 recycling Methods 0.000 description 2
- 239000002912 waste gas Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 102000002322 Egg Proteins Human genes 0.000 description 1
- 108010000912 Egg Proteins Proteins 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000001580 bacterial effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009264 composting Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001599 direct drying Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000005469 granulation Methods 0.000 description 1
- 230000003179 granulation Effects 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 239000003864 humus Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 210000004681 ovum Anatomy 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
Images
Classifications
-
- 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
- C02F2303/10—Energy recovery
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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)
- Treatment Of Sludge (AREA)
Abstract
The invention discloses a sludge drying system for gradient utilization of heat source energy, which comprises a preheater, a disc dryer, sealed sludge conveying equipment, a steam conveying pipeline and an adjusting bypass, wherein the preheater is arranged on the disc dryer; a sludge outlet of the preheater is communicated with a sludge inlet of the disc dryer, and a dry sludge outlet of the disc dryer is communicated with an inlet of the sealed sludge conveying equipment; the steam conveying pipeline is communicated with a steam inlet of the disc dryer, a steam condensate outlet of the disc dryer is divided into two paths, one path is communicated with the adjusting bypass, the other path is communicated with a steam inlet of the preheater, the system can effectively utilize the waste heat of the steam condensate discharged by the disc dryer, the heat gradient utilization is realized, and the steam consumption of the disc dryer for drying sludge is reduced.
Description
Technical Field
The invention belongs to the technical field of environmental protection equipment, and relates to a sludge drying system for gradient utilization of heat source energy.
Background
The sludge is used as an accessory product after sewage treatment in a sewage treatment plant, and is rich in harmful substances such as organic humus, bacterial thallus, parasitic ovum, heavy metal and the like, so that the environment pollution is large if the sludge is not subjected to harmless treatment. At present, sludge treatment modes mainly comprise boiler incineration, sludge aerobic composting, drying granulation, sanitary landfill after pretreatment and the like. The adoption of drying equipment for sludge drying and then incineration is a mainstream technical route for large-scale and low-cost treatment of sludge, and can realize harmless, stable, recycling and greening treatment of sludge.
The sludge drying mode mainly comprises direct drying, indirect drying and direct and indirect combined drying according to different contact modes of a heat exchange medium and sludge. At present, the mature drying process applied in domestic engineering mainly comprises the following steps: fluidized bed, disc, two-stage, thin-layer, paddle, belt, etc. Among them, the disc type sludge dryer has the most extensive application cases.
The traditional disc type dryer consumes 0.8 ton of 0.5MPa saturated steam for treating 1 ton of wet sludge with 80% water content, which is higher than the steam consumption of the two-stage dryer. Saturated steam enters the disc dryer to release heat and then is condensed into liquid water to be discharged out of the dryer body, the discharged steam condensate is properly cooled by the cooler and then is collected to the steam condensate tank for temporary storage, and the steam condensate is pressurized by the condensate pump and then is pumped to a heat supply unit or a heat source supply position for water supplement and recycling. The temperature of the steam condensate from the dryer is about 95 ℃, and the steam condensate still has heat utilization value. At present, the conventional disc dryer and the conventional system thereof cool the condensed steam for reuse, which causes heat waste.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a sludge drying system with gradient utilization of heat source energy, which can effectively utilize the waste heat of steam condensate water discharged by a disc dryer, realize gradient utilization of heat and reduce the steam consumption of sludge dried by the disc dryer.
In order to achieve the aim, the sludge drying system for gradient utilization of heat source energy comprises a preheater, a disc dryer, sealed sludge conveying equipment, a steam conveying pipeline and an adjusting bypass;
a sludge outlet of the preheater is communicated with a sludge inlet of the disc dryer, and a dry sludge outlet of the disc dryer is communicated with an inlet of the sealed sludge conveying equipment;
the steam conveying pipeline is communicated with a steam inlet of the disc dryer, a steam condensed water outlet of the disc dryer is divided into two paths, one path is communicated with the adjusting bypass, and the other path is communicated with a steam inlet of the preheater.
The sludge outlet of the preheater is communicated with the sludge inlet of the disc dryer through a plunger pump.
And a drainage valve group is arranged at a drainage outlet of the disc dryer.
And a tail gas outlet of the disc dryer and a tail gas outlet of the sealed sludge conveying equipment are communicated with a tail gas conveying pipeline.
The preheater is a coil type heat exchanger, a shell-and-tube type heat exchanger or a plate type heat exchanger.
The invention has the following beneficial effects:
when the sludge drying system with the heat source energy gradient utilization is specifically operated, the wet sludge is heated by the preheater by utilizing the waste heat of the steam condensate water after heat release in the disc dryer, the temperature of the wet sludge entering the disc dryer is increased, the energy gradient utilization of the steam heat source of the disc dryer is realized, the steam consumption of the sludge dried by the disc dryer is reduced, the energy waste is reduced, the wet sludge is preheated by utilizing the steam condensate water through calculation, and when the sludge temperature is increased by 50 ℃, the steam consumption of the disc dryer can be reduced by about 10%.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Wherein, 1 is a preheater, 2 is a disc dryer, 3 is a drain valve group, 4 is sealed sludge conveying equipment, 5 is a steam condensate outlet, 6 is a plunger pump, 7 is a sludge inlet, and 8 is a dry sludge outlet.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
referring to fig. 1, the sludge drying system with gradient utilization of heat source energy according to the present invention includes a preheater 1, a disc dryer 2, a sealed sludge conveying device 4, a steam conveying pipeline, and a regulating bypass; a sludge outlet of the preheater 1 is communicated with a sludge inlet 7 of the disc dryer 2, and a dry sludge outlet 8 of the disc dryer 2 is communicated with an inlet of the sealed sludge conveying equipment 4; the steam conveying pipeline is communicated with a steam inlet of the disc dryer 2, a steam condensed water outlet 5 of the disc dryer 2 is divided into two paths, one path is communicated with the regulating bypass, and the other path is communicated with a steam inlet of the preheater 1.
A sludge outlet of the preheater 1 is communicated with a sludge inlet 7 of the disc dryer 2 through a plunger pump 6; a drain valve group 3 is arranged at a drain outlet of the disc dryer 2; a tail gas outlet of the disc dryer 2 and a tail gas outlet of the sealed sludge conveying equipment 4 are communicated with a tail gas conveying pipeline; the preheater 1 is a coil type heat exchanger, a shell-and-tube type heat exchanger or a plate type heat exchanger.
The heat source steam (about 0.5MPa, 152 ℃ saturated steam) of the disc dryer 2 enters from a steam inlet of the disc dryer 2, indirectly releases heat to the sludge through the surface of the disc in the disc dryer 2, and then is led out from a steam condensate outlet 5 of the disc dryer 2; one path of steam condensate water output by the disc dryer 2 enters the preheater 1 to preheat wet sludge, and the other path of steam condensate water is used as a regulating bypass; wet sludge preheated by the preheater 1 is conveyed to a sludge inlet 7 of the disc dryer 2 through a plunger pump 6, dried by the disc dryer 2 and discharged from a dry sludge outlet 8 of the disc dryer 2, and then conveyed to a dry sludge storage bin for temporary storage through a sealed sludge conveying device 4; and the waste gas (steam and air mixture) generated in the sludge drying process escapes from a tail gas outlet of the disc dryer 2 for subsequent tail gas treatment, wherein the waste gas condensate and the drain water flowing out of the drain valve group 3 are conveyed to a sewage treatment plant for further treatment through a pipeline after reaching the standard through wastewater treatment.
The working principle of the invention is as follows: the waste heat of the steam condensate water after heat release in the disc dryer 2 is utilized to heat wet sludge through the preheater 1, the temperature of the wet sludge entering the disc dryer 2 is improved, the energy gradient utilization of a steam heat source of the disc dryer 2 is realized, and the steam consumption of the disc dryer 2 for drying the sludge is reduced. During actual operation, corresponding parameters can be designed according to actual needs, the structure of the preheater 1 and the flow of steam condensate entering the preheater 1 are changed, and performance parameters such as steam consumption and the like of the disc dryer 2 for drying sludge are further influenced.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made in the above embodiments by those of ordinary skill in the art without departing from the principle and spirit of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (5)
1. A sludge drying system with gradient utilization of heat source energy is characterized by comprising a preheater (1), a disc dryer (2), sealed sludge conveying equipment (4), a steam conveying pipeline and an adjusting bypass;
a sludge outlet of the preheater (1) is communicated with a sludge inlet (7) of the disc dryer (2), and a dry sludge outlet (8) of the disc dryer (2) is communicated with an inlet of the sealed sludge conveying equipment (4);
the steam conveying pipeline is communicated with a steam inlet of the disc dryer (2), a steam condensed water outlet (5) of the disc dryer (2) is divided into two paths, one path is communicated with the adjusting bypass, and the other path is communicated with a steam inlet of the preheater (1).
2. A heat source energy cascade utilization sludge drying system as claimed in claim 1, characterized in that the sludge outlet of the preheater (1) is in communication with the sludge inlet (7) of the disc dryer (2) via a plunger pump (6).
3. A heat source energy cascade sludge drying system as claimed in claim 1, characterized in that a trap valve group (3) is arranged at the trap outlet of the disc dryer (2).
4. The sludge drying system utilizing the heat source energy in a gradient manner as claimed in claim 1, wherein the tail gas outlet of the disc dryer (2) and the tail gas outlet of the sealed sludge conveying device (4) are communicated with a tail gas conveying pipeline.
5. The heat source energy cascade utilization sludge drying system according to claim 1, wherein the preheater (1) is a coil heat exchanger, a shell-and-tube heat exchanger or a plate heat exchanger.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911184016.1A CN110746081A (en) | 2019-11-27 | 2019-11-27 | Sludge drying system with gradient utilization of heat source energy |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911184016.1A CN110746081A (en) | 2019-11-27 | 2019-11-27 | Sludge drying system with gradient utilization of heat source energy |
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| Publication Number | Publication Date |
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| CN110746081A true CN110746081A (en) | 2020-02-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911184016.1A Pending CN110746081A (en) | 2019-11-27 | 2019-11-27 | Sludge drying system with gradient utilization of heat source energy |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112479550A (en) * | 2020-11-09 | 2021-03-12 | 西安热工研究院有限公司 | Deep energy-saving system for coupling sludge steam drying of coal-fired power plant |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102992575A (en) * | 2012-12-14 | 2013-03-27 | 中国石油天然气集团公司 | Steam thermal cycle sludge drying method and system |
| CN104671633A (en) * | 2015-03-16 | 2015-06-03 | 天华化工机械及自动化研究设计院有限公司 | Steam condensate preheating and steam drying two-stage energy-saving sludge drying method |
| CN211170406U (en) * | 2019-11-27 | 2020-08-04 | 中国华能集团清洁能源技术研究院有限公司 | Sludge drying system with gradient utilization of heat source energy |
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2019
- 2019-11-27 CN CN201911184016.1A patent/CN110746081A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102992575A (en) * | 2012-12-14 | 2013-03-27 | 中国石油天然气集团公司 | Steam thermal cycle sludge drying method and system |
| CN104671633A (en) * | 2015-03-16 | 2015-06-03 | 天华化工机械及自动化研究设计院有限公司 | Steam condensate preheating and steam drying two-stage energy-saving sludge drying method |
| CN211170406U (en) * | 2019-11-27 | 2020-08-04 | 中国华能集团清洁能源技术研究院有限公司 | Sludge drying system with gradient utilization of heat source energy |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112479550A (en) * | 2020-11-09 | 2021-03-12 | 西安热工研究院有限公司 | Deep energy-saving system for coupling sludge steam drying of coal-fired power plant |
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