CN211847686U - Graded heat utilization sludge low-temperature belt type drying system - Google Patents
Graded heat utilization sludge low-temperature belt type drying system Download PDFInfo
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- CN211847686U CN211847686U CN202020356657.2U CN202020356657U CN211847686U CN 211847686 U CN211847686 U CN 211847686U CN 202020356657 U CN202020356657 U CN 202020356657U CN 211847686 U CN211847686 U CN 211847686U
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Abstract
The utility model discloses a sludge low-temperature belt type drying system utilizing graded heat, an upper air chamber is formed between an upper conveyor and the top of a cavity, a lower air chamber is formed between the upper conveyor and a lower conveyor, and sludge output by a forming machine drops onto a dry sludge conveyor after being dried by the upper conveyor and the lower conveyor in sequence; the circulating air dehumidifying and heating system comprises a heat regenerator, an evaporator and a condenser, wherein an outlet at the bottom of the cavity is divided into two paths after sequentially passing through a heat releasing side of the heat regenerator, a heat releasing side of the evaporator and a heat absorbing side of the heat regenerator, one path is communicated with the lower air chamber, the other path is communicated with an inlet at the top of the cavity through the heat absorbing side of the condenser, a condensation waste water outlet of the evaporator is communicated with a condensation waste water pipeline, the energy consumption of the system is low, meanwhile, the corrosion of dust-containing air to the circulating air dehumidifying and heating system can be reduced, and the maintenance cost is low.
Description
Technical Field
The utility model belongs to the technical field of the environmental protection equipment, a mud low temperature belt mummification system of hierarchical heat utilization is related to.
Background
The sludge is used as an accessory product of a sewage treatment plant after sewage treatment, has great pollution to the environment and needs to be subjected to harmless treatment. At present, sludge drying and then incineration are the most thorough sludge treatment mode. Compared with high-temperature drying processes (including fluidized bed type, disc type, two-stage type, thin layer type, paddle type and the like), the low-temperature sludge drying technology has the advantages of less odor and dust and better water quality of condensed wastewater. Therefore, the low-temperature sludge drying technology is widely applied to sewage treatment plants.
The traditional sludge low-temperature belt type drying system has the following problems:
1) the running energy consumption of the low-temperature belt type drying system still has a reduced space;
2) when the drying system runs for a long time, the dust-containing air corrodes the circulating air dehumidifying and heating system, so that the output of the low-temperature belt drying system is influenced;
3) the system needs to be provided with a multi-stage dust filter, filter cloth of the filter needs to be replaced periodically, and the daily maintenance cost has a reduced space.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome above-mentioned prior art's shortcoming, provide a mud low temperature belt mummification system of hierarchical heat utilization, the energy consumption of this system is lower, can alleviate dirty air to the corruption of circulated air dehumidification heating system simultaneously, and the maintenance cost is lower.
In order to achieve the above object, the low-temperature belt type sludge drying system utilizing graded heat comprises a sludge drying system and a circulating air dehumidifying and heating system, wherein the sludge drying system comprises a cavity, a forming machine and an upper layer conveyor, a lower layer conveyor and a dry sludge conveyor which are arranged in the cavity and are sequentially distributed from top to bottom, an upper air chamber is formed between the upper layer conveyor and the top of the cavity, a lower air chamber is formed between the upper layer conveyor and the lower layer conveyor, and sludge output by the forming machine drops onto the dry sludge conveyor after being dried by the upper layer conveyor and the lower layer conveyor in sequence;
the circulating air dehumidifying and heating system comprises a heat regenerator, an evaporator and a condenser, wherein an outlet at the bottom of the cavity is divided into two paths after sequentially passing through a heat releasing side of the heat regenerator, a heat releasing side of the evaporator and a heat absorbing side of the heat regenerator, one path is communicated with the lower air chamber, the other path is communicated with an inlet at the top of the cavity through the heat absorbing side of the condenser, and a condensed wastewater outlet of the evaporator is communicated with a condensed wastewater pipeline.
The heat absorption side of the condenser is communicated with an inlet at the top of the cavity through a circulating fan.
The hot air used for drying the sludge in the cavity flows from top to bottom.
The circulating air dehumidifying and heating system also comprises a compressor and an expansion valve;
the heat absorbing side outlet of the evaporator is communicated with the heat releasing side inlet of the condenser through the compressor, and the heat releasing side outlet of the condenser is communicated with the heat absorbing side inlet of the evaporator through the expansion valve.
The circulating air dehumidifying and heating system also comprises a heat exchange system, a cooling water tower and a hot water tank;
the outlet of the cooling water tower is communicated with the heat absorption side inlet of the evaporator, and the heat absorption side outlet of the evaporator is communicated with the inlet of the cooling water tower;
the outlet of the heat exchange system is communicated with the inlet of the hot water tank, the outlet of the hot water tank is communicated with the heat release side inlet of the condenser, and the heat release side outlet of the condenser is communicated with the inlet of the heat exchange system.
The outlet of the cooling water tower is communicated with the heat absorption side inlet of the evaporator through a circulating water pump.
The outlet of the hot water tank is communicated with the heat release side inlet of the condenser through a hot water pump.
The upper air chamber and the lower air chamber in the cavity are both formed by a plurality of small air chambers, and the air volume of each small air chamber is adjustable along the width direction and the length direction of the upper conveyor and the lower conveyor.
The utility model discloses following beneficial effect has:
hierarchical thermal utilization's mud low temperature belt mummification system when concrete operation, hot-blast top-down flows in the cavity, the higher sludge drying of moisture content on the upper conveyer guipure of high temperature hot-blast pair, does not mummification lower floor's conveyer guipure lower sludge of moisture content together with the hot-blast of part heating of condenser again to realize the hierarchical optimal utilization of hot-blast energy, thereby effectively reduce the operation energy consumption of mud low temperature belt mummification system. In addition, hot air for drying the sludge flows from top to bottom, under the multiple retardation action of the hot air, the sludge and the mesh belt, dust in the sludge drying process is not easy to escape, the explosion risk caused by high dust concentration is avoided, a multistage dust filter is not required to be configured, the daily maintenance cost is reduced, the corrosion degree of a circulating air dehumidification heating system is effectively reduced, the service life of the system is prolonged, and the influence on the whole output of the system caused by equipment corrosion is reduced.
Drawings
FIG. 1 is a schematic structural diagram according to a first embodiment;
fig. 2 is a schematic structural diagram of the second embodiment.
Wherein, 1 is a forming machine, 2 is an upper-layer air chamber, 3 is an upper-layer conveyor, 4 is a lower-layer air chamber, 5 is a lower-layer conveyor, 6 is a dry sludge conveyor, 7 is a heat regenerator, 8 is an evaporator, 9 is a condenser, 10 is a circulating fan, 11 is a condensed wastewater pipeline, 12 is a compressor, 13 is an expansion valve, 14 is a circulating water pump, 15 is a cooling water tower, 16 is a hot water pump, 17 is a hot water tank, and 18 is a heat exchange system.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings:
referring to fig. 1, the low-temperature belt-type sludge drying system for graded heat utilization of the present invention includes a sludge drying system and a circulating air dehumidifying and heating system, wherein the sludge drying system includes a cavity, a forming machine 1, and an upper conveyor 3, a lower conveyor 5 and a dry sludge conveyor 6 which are disposed in the cavity and sequentially distributed from top to bottom, wherein an upper plenum 2 is formed between the upper conveyor 3 and the top of the cavity, a lower plenum 4 is formed between the upper conveyor 3 and the lower conveyor 5, and sludge output from the forming machine 1 is dried by the upper conveyor 3 and the lower conveyor 5 and then falls onto the dry sludge conveyor 6; the circulating air dehumidifying and heating system comprises a heat regenerator 7, an evaporator 8 and a condenser 9, wherein an outlet at the bottom of the cavity is divided into two paths after sequentially passing through a heat releasing side of the heat regenerator 7, a heat releasing side of the evaporator 8 and a heat absorbing side of the heat regenerator 7, one path is communicated with the lower air chamber 4, the other path is communicated with an inlet at the top of the cavity through a heat absorbing side of the condenser 9, and a condensed wastewater outlet of the evaporator 8 is communicated with a condensed wastewater pipeline 11; the heat absorption side of the condenser 9 is communicated with the inlet at the top of the cavity through a circulating fan 10.
The heat regenerator 7, the evaporator 8 and the condenser 9 can be fin heat exchangers, plate heat exchangers, shell-and-tube heat exchangers or other high-efficiency heat exchangers; the upper air chamber 2 and the lower air chamber 4 are both composed of a plurality of small air chambers, and the air volume of each small air chamber is adjustable along the width direction and the length direction of the upper conveyor 3 and the lower conveyor 5.
Wet sludge with the water content of 70-85% enters a forming machine 1 to be generated into strip-shaped or granular sludge, then the strip-shaped or granular sludge falls on a mesh belt of an upper layer conveyor 3 to be spread evenly, the sludge is gradually dried by absorbing heat of dry hot air flowing from top to bottom in the advancing process of the upper layer conveyor 3, then the sludge falls into the head of a lower layer conveyor 5 from the tail of the upper layer conveyor 3 to continuously absorb the heat of the hot air flowing from top to bottom, finally the sludge is dried to the set water content requirement, then the dried sludge falls onto a dry sludge conveyor 6, and finally the dried sludge is transported out for.
Moist hot air carrying sludge moisture and output from an outlet at the bottom of the cavity enters a heat release side of a heat regenerator 7 for heat release cooling, then enters a heat release side of an evaporator 8 for continuous cooling, condensable gas in the moist hot air is condensed due to the temperature lower than the dew point temperature of dust-containing airflow, condensed wastewater is discharged through a condensed wastewater pipeline 11, uncondensed hot air is cooled by the evaporator 8 and then is reduced in temperature, then enters a heat absorption side of the heat regenerator 7 for heat absorption, the temperature is raised to a certain extent, hot air output from the heat absorption side of the heat regenerator 7 is divided into two paths, wherein one path enters a lower air chamber 4, and is combined with hot air after sufficient heat exchange with sludge on a mesh belt of an upper conveyor 3 to dry the sludge on the mesh belt of a lower conveyor 5; the other path enters the heat absorption side of the condenser 9 to absorb heat and then enters the cavity through the circulating fan 10.
Example one
Referring to fig. 1, the circulating air dehumidifying and heating system further includes a compressor 12 and an expansion valve 13; the heat absorption side outlet of the evaporator 8 communicates with the heat release side inlet of the condenser 9 via a compressor 12, and the heat release side outlet of the condenser 9 communicates with the heat absorption side inlet of the evaporator 8 via an expansion valve 13.
The refrigerant in the circulating air dehumidifying and heating system can adopt inorganic compounds, fluoride pure working media, hydrocarbons or mixed refrigerants, such as R142b, R134a, R22 and the like.
The refrigerant flow of the present embodiment is: the refrigerant is compressed into high-temperature high-pressure refrigerant gas by the compressor 12, then enters the condenser 9 for heat release to become high-pressure saturated or supercooled liquid, then becomes low-pressure low-temperature refrigerant liquid by the expansion valve 13, then enters the heat absorption side of the evaporator 8 for absorbing heat to become low-pressure high-temperature refrigerant gas, and finally enters the compressor 12.
Example two
Referring to fig. 2, the circulated air dehumidifying and heating system further includes a heat exchange system 18, a cooling water tower 15 and a hot water tank 17; the outlet of the cooling water tower 15 is communicated with the heat absorption side inlet of the evaporator 8, and the heat absorption side outlet of the evaporator 8 is communicated with the inlet of the cooling water tower 15; the outlet of the heat exchange system 18 is communicated with the inlet of the hot water tank 17, the outlet of the hot water tank 17 is communicated with the heat-releasing side inlet of the condenser 9, the heat-releasing side outlet of the condenser 9 is communicated with the inlet of the heat exchange system 18, and the outlet of the cooling water tower 15 is communicated with the heat-absorbing side inlet of the evaporator 8 through the circulating water pump 14; the outlet of the hot water tank 17 is communicated with the inlet of the heat-releasing side of the condenser 9 via a hot water pump 16.
In this embodiment, the cold source working medium of the evaporator 8 is circulating water, and the circulating water is sent to the evaporator 8 by the circulating water pump 14 to absorb heat, and then is returned to the cooling tower 15 to be cooled and recycled.
The heat source working medium of the condenser 9 is hot water, the hot water is pumped out from a hot water tank 17 by a hot water pump 16, enters the condenser 9 to release heat and then returns to an inlet of a cold source end of a heat exchange system 18, and the heat is absorbed in the heat exchange system 18 and heated and then returns to the hot water tank 17 for recycling.
The heat source of the heat exchange system 18 may be hot flue gas, steam, hot water or heat conducting oil.
The utility model discloses a theory of operation does: on one hand, the high-temperature hot air dries the sludge with higher water content (more than about 50%) on the mesh belt of the upper layer conveyor 3, and the hot air cooled by heat exchange with the upper layer sludge dries the sludge with lower water content (less than about 50%) on the mesh belt of the lower layer conveyor 5 together with the other part of hot air which is not heated by the condenser 9, so that the graded optimal utilization of the energy of the hot air is realized, and the operating energy consumption of the low-temperature belt type drying system of the sludge is reduced; on the other hand, under the multiple retardation action of hot air, sludge and mesh belts, dust is not easy to escape in the sludge drying process, and during actual operation, corresponding parameters can be designed according to actual requirements, so that the structural types of the heat exchangers and the flow, temperature and the like of flowing media in the system are changed, and further performance parameters of the whole system on the sludge drying efficiency and the like are 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 (8)
1. The low-temperature belt type sludge drying system is characterized by comprising a sludge drying system and a circulating air dehumidifying and heating system, wherein the sludge drying system comprises a cavity, a forming machine (1), an upper-layer conveyor (3), a lower-layer conveyor (5) and a dry sludge conveyor (6), the upper-layer conveyor (3), the lower-layer conveyor (5) and the dry sludge conveyor (6) are arranged in the cavity and sequentially distributed from top to bottom, an upper-layer air chamber (2) is formed between the upper-layer conveyor (3) and the top of the cavity, a lower-layer air chamber (4) is formed between the upper-layer conveyor (3) and the lower-layer conveyor (5), and sludge output by the forming machine (1) sequentially passes through the upper-layer conveyor (3) and the lower-layer conveyor (5) to be dried and then falls onto the dry sludge conveyor;
the circulating air dehumidifying and heating system comprises a heat regenerator (7), an evaporator (8) and a condenser (9), wherein an outlet at the bottom of the cavity is divided into two paths after sequentially passing through a heat releasing side of the heat regenerator (7), a heat releasing side of the evaporator (8) and a heat absorbing side of the heat regenerator (7), one path is communicated with the lower air chamber (4), the other path is communicated with an inlet at the top of the cavity through the heat absorbing side of the condenser (9), and a condensed wastewater outlet of the evaporator (8) is communicated with a condensed wastewater pipeline (11).
2. The system for drying sludge by low temperature belt with graded heat utilization according to claim 1, characterized in that the heat absorption side of the condenser (9) is communicated with the inlet at the top of the cavity through a circulating fan (10).
3. The staged heat-utilizing sludge low-temperature belt drying system as claimed in claim 1, wherein the hot air for drying the sludge in the chamber flows from top to bottom.
4. The system for drying sludge by low temperature belt with graded heat utilization according to claim 1, wherein the circulating air dehumidifying and heating system further comprises a compressor (12) and an expansion valve (13);
the heat absorption side outlet of the evaporator (8) is communicated with the heat release side inlet of the condenser (9) through a compressor (12), and the heat release side outlet of the condenser (9) is communicated with the heat absorption side inlet of the evaporator (8) through an expansion valve (13).
5. The system for drying sludge by low temperature belt with graded heat utilization according to claim 1, wherein the circulating air dehumidifying and heating system further comprises a heat exchange system (18), a cooling water tower (15) and a hot water tank (17);
an outlet of the cooling water tower (15) is communicated with an inlet of a heat absorption side of the evaporator (8), and an outlet of the heat absorption side of the evaporator (8) is communicated with an inlet of the cooling water tower (15);
the outlet of the heat exchange system (18) is communicated with the inlet of the hot water tank (17), the outlet of the hot water tank (17) is communicated with the heat-releasing side inlet of the condenser (9), and the heat-releasing side outlet of the condenser (9) is communicated with the inlet of the heat exchange system (18).
6. The system for drying sludge by low temperature belt with graded heat utilization as claimed in claim 5, characterized in that the outlet of the cooling water tower (15) is communicated with the inlet of the heat absorption side of the evaporator (8) through a circulating water pump (14).
7. The system for drying sludge by low temperature belt with graded heat utilization as claimed in claim 5, is characterized in that the outlet of the hot water tank (17) is communicated with the inlet of the heat-releasing side of the condenser (9) through a hot water pump (16).
8. The staged heat utilization sludge low-temperature belt type drying system as claimed in claim 1, wherein the upper air chamber (2) and the lower air chamber (4) in the chamber are both composed of a plurality of small air chambers, and the air volume of each small air chamber is adjustable along the width and length directions of the upper conveyor (3) and the lower conveyor (5).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020356657.2U CN211847686U (en) | 2020-03-19 | 2020-03-19 | Graded heat utilization sludge low-temperature belt type drying system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020356657.2U CN211847686U (en) | 2020-03-19 | 2020-03-19 | Graded heat utilization sludge low-temperature belt type drying system |
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| CN211847686U true CN211847686U (en) | 2020-11-03 |
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