CN211170406U - Sludge drying system with gradient utilization of heat source energy - Google Patents
Sludge drying system with gradient utilization of heat source energy Download PDFInfo
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- CN211170406U CN211170406U CN201922099184.2U CN201922099184U CN211170406U CN 211170406 U CN211170406 U CN 211170406U CN 201922099184 U CN201922099184 U CN 201922099184U CN 211170406 U CN211170406 U CN 211170406U
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Abstract
The utility model discloses a sludge drying system with gradient utilization of heat source energy, which comprises a preheater, a disc dryer, a sealed sludge conveying device, 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 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 utility model belongs to the technical field of the environmental protection equipment, a sludge drying system that heat source energy step utilized is related to.
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.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome above-mentioned prior art's shortcoming, provide a sludge drying system that heat source energy step utilized, this system can effectively utilize the waste heat of disc drier exhaust steam condensate, realizes thermal step utilization, reduces the steam consumption of disc drier mummification mud.
In order to achieve the purpose, the sludge drying system for gradient utilization of heat source energy comprises a preheater, a disc dryer, a sealed sludge conveying device, 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 utility model discloses following beneficial effect has:
the sludge drying system that heat source energy step utilized when concrete operation, utilize the waste heat of the steam condensate water after exothermic in the disc dryer, heat wet mud through the pre-heater, improve the wet sludge temperature who gets into the disc dryer, realize the energy step utilization of disc dryer steam heat source, reduce the steam consumption of disc dryer mummification mud, it is extravagant to reduce the energy, through calculating, utilize steam condensate water to preheat wet mud, when promoting mud temperature 50 ℃, can reduce the steam consumption of disc dryer 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 present invention will be described in further detail with reference to the accompanying drawings:
referring to fig. 1, the sludge drying system using heat source energy in a cascade manner of the present invention includes a preheater 1, a disc dryer 2, a sealed sludge conveying device 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 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 utility model discloses a theory of operation does: 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, it is to be understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that changes, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the principles 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 |
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| CN201922099184.2U CN211170406U (en) | 2019-11-27 | 2019-11-27 | Sludge drying system with gradient utilization of heat source energy |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922099184.2U CN211170406U (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 |
|---|---|---|---|---|
| CN110746081A (en) * | 2019-11-27 | 2020-02-04 | 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
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110746081A (en) * | 2019-11-27 | 2020-02-04 | 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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