CN110131987B - System closed loop type sludge dehumidifying and drying system - Google Patents
System closed loop type sludge dehumidifying and drying system Download PDFInfo
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- CN110131987B CN110131987B CN201910418241.0A CN201910418241A CN110131987B CN 110131987 B CN110131987 B CN 110131987B CN 201910418241 A CN201910418241 A CN 201910418241A CN 110131987 B CN110131987 B CN 110131987B
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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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B17/00—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/001—Drying-air generating units, e.g. movable, independent of drying enclosure
- F26B21/002—Drying-air generating units, e.g. movable, independent of drying enclosure heating the drying air indirectly, i.e. using a heat exchanger
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/004—Nozzle assemblies; Air knives; Air distributors; Blow boxes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/02—Circulating air or gases in closed cycles, e.g. wholly within the drying enclosure
- F26B21/04—Circulating air or gases in closed cycles, e.g. wholly within the drying enclosure partly outside the drying enclosure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/06—Controlling, e.g. regulating, parameters of gas supply
- F26B21/08—Humidity
- F26B21/086—Humidity by condensing the moisture in the drying medium, which may be recycled, e.g. using a heat pump cycle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B2200/00—Drying processes and machines for solid materials characterised by the specific requirements of the drying good
- F26B2200/18—Sludges, e.g. sewage, waste, industrial processes, cooling towers
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (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)
- Drying Of Gases (AREA)
Abstract
The invention relates to a system closed-loop type sludge dehumidifying and drying system, which comprises a box body, wherein the box body is divided into a sludge drying area and a dehumidifying and heating area by a partition plate, and the system is characterized in that: the dehumidification heating area is provided with at least three air channels: the main air duct is sequentially provided with a precooling system evaporator, a main dehumidification system evaporator and a precooling system auxiliary condenser from the air inlet direction to the air outlet direction; the inner balance first air duct is provided with a precooling system main condenser; the inner balance second air channel is provided with a main dehumidifying system condenser. The invention has the advantages that: the invention can realize the stable and reliable closed-loop operation of the whole drying system without frequent external heat dissipation.
Description
Technical Field
The invention relates to a drying system, in particular to a system closed loop type sludge dehumidifying and drying system.
Background
With the enhancement of national economic strength and the improvement of national environmental protection consciousness, the urban sewage treatment industry is rapidly developed, the output of urban sludge and enterprise sludge is increased day by day, and the problems of sludge disposal, development and utilization are increasingly concerned by people.
The traditional sludge treatment mode is drying equipment adopting a condensation method, and the working principle is as follows: the basic principle of drying equipment adopting a condensation method in the industry is similar, the wet air from a drying chamber is cooled and dehumidified through a refrigeration system, and when the wet air flows through an evaporator, the evaporator is used for evaporating and absorbing heat to cool the air and discharge most of condensed water in the air; when the dehumidified dry and cold air flows through the condenser of the same refrigeration system as the evaporator, the condenser condenses to release heat to heat the air, and the air is changed into hot air so as to dry the product.
The drying equipment adopting the air-conditioning refrigeration system principle in the current market mainly has the following problems:
due to the physical state change of materials and the design reason of an air channel, the cold and heat balance of an evaporator and a condenser of a compressor unit can be broken, and an external cooler connected with the system needs to be additionally arranged, so that the system can frequently discharge overload heat to the environment outside the system in the working process; the real closed-loop operation cannot be realized, and the working condition of the compressor of the refrigerating system is poor due to the waste of heat energy, frequent high-pressure unbalance and high-pressure impact.
In order to solve the above problems, some equipment manufacturers control the temperature upper limit value of the temperature that can be borne by the evaporator of the compressor to be constant through a cooling tower externally arranged on the equipment and a heat regenerator internally arranged in the equipment, so as to ensure the normal operation of the compressor system. However, the heat release performance of the condenser is limited, and likewise, the constant temperature relief of the external cooling causes severe heat loss.
Disclosure of Invention
The invention aims to provide a system closed loop type sludge dehumidifying and drying system which can establish stable system internal balance and is energy-saving.
In order to solve the technical problems, the technical scheme of the invention is as follows: the utility model provides a system closed loop formula sludge dehumidifying drying system, includes the box, and the box is separated into sludge drying district and dehumidification zone of heating by the baffle, and its innovation point lies in: the dehumidification heating area is provided with a first top layer air return inlet and a bottom layer air outlet, the first top layer air return inlet is communicated with the top of the sludge drying area, and the bottom layer air outlet is communicated with the bottom of the sludge drying area; the dehumidification heating area is provided with at least one air duct: the air inlet end of the main air duct is a first top layer air return inlet, and the air outlet end of the main air duct is a bottom layer air outlet; a precooling system evaporator, a main dehumidification system evaporator and a precooling system auxiliary condenser are sequentially arranged on the main air duct from the air inlet direction to the air outlet direction; the evaporator of the precooling system and the auxiliary condenser of the precooling system are connected into the same precooling compression refrigeration system, and the evaporator of the main dehumidifying system is connected into the main dehumidifying compression refrigeration system.
Preferably, the dehumidification heating area is provided with at least one first top-layer air return inlet, at least one second top-layer air return inlet and at least one third top-layer air return inlet, and the first top-layer air return inlet, the second top-layer air return inlet and the third top-layer air return inlet are all communicated with the top of the sludge drying area;
the dehumidification heating area is also provided with at least one middle-layer air outlet and at least one bottom-layer air outlet, the middle-layer air outlet is communicated with the middle part of the sludge drying area, and the bottom-layer air outlet is communicated with the bottom of the sludge drying area;
the dehumidification heating area has at least three air channels:
the air inlet end of the main air duct is a first top layer air return inlet, and the air outlet end of the main air duct is a bottom layer air outlet; a precooling system evaporator, a main dehumidification system evaporator and a precooling system auxiliary condenser are sequentially arranged on the main air duct from the air inlet direction to the air outlet direction;
the air inlet end of the inner balance first air duct is a second top layer air return inlet, and the air outlet end of the inner balance first air duct is a middle layer air outlet; a precooling system main condenser is arranged on the inner balance first air channel;
the air inlet end of the inner balance second air duct is a third top layer air return inlet, and the air outlet end of the inner balance second air duct is also a bottom layer air outlet; a main dehumidification system condenser is arranged on the inner balance second air channel;
the evaporator of the precooling system, the main condenser of the precooling system and the auxiliary condenser of the precooling system are connected into the same precooling compression refrigeration system, and the evaporator of the main dehumidifying system and the condenser of the main dehumidifying system are connected into the same main dehumidifying compression refrigeration system.
Preferably, the pre-cooling compression refrigeration system comprises a pre-cooling compressor, a pre-cooling system evaporator, an expansion valve assembly I, a pre-cooling system main condenser and a pre-cooling system auxiliary condenser; the precooling compressor, the precooling system auxiliary condenser, the precooling system main condenser, the expansion valve assembly I and the precooling system evaporator are sequentially connected end to end through pipelines to form an internal circulation compression refrigeration system;
the main dehumidifying compression refrigeration system comprises a main dehumidifying compressor, a main dehumidifying system evaporator, a main dehumidifying system condenser and an expansion valve assembly II, wherein the main dehumidifying compressor, the main dehumidifying system condenser, the expansion valve assembly II and the main dehumidifying system evaporator are sequentially connected end to end through other pipelines to form another internal circulation compression refrigeration system.
Preferably, the number of the pre-cooling system main condensers and the number of the pre-cooling system auxiliary condensers are two, the two pre-cooling system main condensers are arranged in parallel, and the two pre-cooling system auxiliary condensers are arranged in parallel.
Preferably, the pre-cooling compression refrigeration system further comprises a system backup condenser for emergency of system heat balance discharge, the system backup condenser is mounted on a box body of the dehumidification heating area and used for releasing redundant heat due to no load or requirement of equipment, and the system backup condenser is arranged on a pipeline between the pre-cooling compressor and the auxiliary condenser of the pre-cooling system in parallel.
Preferably, the middle layer air outlet and the bottom layer air outlet are respectively provided with an induced draft fan.
Principle of operation
Firstly, dry hot air dehumidified and heated by a dehumidification heating zone enters from the bottom of a sludge drying zone, and is used for drying sludge through a conveying belt of the sludge drying zone from bottom to top;
most of the air in the top-layer return air enters the main air duct through the first top-layer return air inlet, and when the air passes through the precooling system evaporator, the precooling system evaporator absorbs the heat of the top-layer return air to cool the top-layer return air, and the relative humidity of the cooled return air is greatly improved; the top layer return air with higher relative humidity passes through the evaporator of the main dehumidification system for secondary cooling, so that moisture in the top layer return air is condensed, the top layer return air is dehumidified, then is heated by the auxiliary condenser of the precooling system to form dry hot air, and finally is sent into the sludge drying area again through the air outlet of the bottom layer through the induced draft fan for recycling;
a small part of air in the top layer return air enters an independent inner balance first air channel through a second top layer return air inlet, and is heated after heat exchange is carried out between the small part of top layer return air with lower temperature and a main condenser of the precooling system, and then the small part of air is sent to the middle part of the sludge drying area again through a middle layer air outlet, so that the upper part of the sludge drying area with relatively lower temperature can be heated additionally, the drying efficiency of the upper part of the sludge drying area is improved, and the heat load requirement of the main condenser of the precooling system in the precooling compression refrigeration system can be balanced;
and the other small part of the top layer return air enters the inner balance second air channel through the third top layer return air inlet, and the part of the top layer return air is heated by the condenser of the main dehumidification system and then returns to the sludge drying area through the bottom air outlet.
The invention has the advantages that:
in the invention, the precooling system evaporator is used for precooling the top layer return air, so that the dehumidification effect of the main dehumidification system evaporator is greatly improved, in order to meet the system balance requirement of a precooling compression system in which the precooling system evaporator is positioned, the precooling system auxiliary condenser is arranged behind the main dehumidification system evaporator in a close proximity mode, the top layer return air with lower temperature can well dissipate heat of the precooling system auxiliary condenser after passing through the precooling system evaporator and absorbing heat of the main dehumidification system evaporator, the precooling system main condenser is dissipated heat through an independent inner balance first air channel, the inner balance of the precooling compression system is realized by using the two precooling system main condensers and the auxiliary condenser together, and the severe working condition of a compressor of the precooling compression system is improved; for the main dehumidifying compression refrigeration system, because the precooling system evaporator is arranged in front of the main dehumidifying evaporator, the pressure of the main dehumidifying compression refrigeration system where the main dehumidifying evaporator is located is greatly reduced, and the main dehumidifying compression refrigeration system is balanced by combining the main dehumidifying condenser located in the inner balance second air channel, so that the stable and reliable closed-loop operation of the whole drying system is realized, and frequent external heat dissipation is not needed.
Drawings
FIG. 1 is a schematic diagram of a system closed-loop sludge dehumidifying and drying system according to an embodiment of the present invention.
FIG. 2 is a schematic diagram of a system of a closed-loop sludge dehumidifying and drying system according to a second embodiment of the present invention.
Fig. 3 is a schematic diagram of an internal cycle compression refrigeration system in a second embodiment.
Fig. 4 is a schematic diagram of another internal cycle compression refrigeration system in a second embodiment.
Detailed Description
The system closed-loop type sludge dehumidifying and drying system comprises a box body, wherein the box body is divided into a sludge drying area a and a dehumidifying and heating area b by a partition plate, the sludge drying area a conveys sludge by adopting a material conveying belt moving from top to bottom, the dehumidifying and heating area b provides circulating hot air from bottom to top for the sludge drying area a, and the temperature of the upper layer of the sludge drying area a is lower than that of the lower layer.
As shown in fig. 1, the dehumidification heating area b has a first top-layer return air inlet 101 and a bottom-layer air outlet 3, the first top-layer return air inlet 101 is communicated with the top of the sludge drying area, and the bottom-layer air outlet 3 is communicated with the bottom of the sludge drying area a;
in order to smoothly dehumidify and heat the air circulating through the sludge drying zone a, the dehumidifying and heating zone has at least one air channel:
the air inlet end of the main air duct 4 is a first top-layer air return inlet 101, and the air outlet end of the main air duct 4 is a bottom-layer air outlet 3; a precooling system evaporator 72, a main dehumidification system evaporator 8 and a precooling system auxiliary condenser 75 are sequentially arranged on the main air duct 4 from the air inlet direction to the air outlet direction; the pre-cooling system evaporator 72 and the pre-cooling system auxiliary condenser 75 are connected into the same pre-cooling compression refrigeration system, and the main dehumidifying system evaporator 8 is connected into the main dehumidifying compression refrigeration system.
The purpose is to pre-cool the top layer return air through an active pre-cooling system evaporator, and further to greatly improve the dehumidifying effect of the main dehumidifying system evaporator.
As a more optimized embodiment of the invention:
as shown in fig. 2, the system closed-loop sludge dehumidifying and drying system of the present invention comprises a box body, the box body is divided into a sludge drying zone a and a dehumidifying and heating zone b by a partition, the dehumidifying and heating zone b has at least one first top layer air return opening 101, at least one second top layer air return opening 102 and at least one third top layer air return opening 103, and the first top layer air return opening 101, the second top layer air return opening 102 and the third top layer air return opening 103 are all communicated with the top of the sludge drying zone a with a relatively low temperature.
The dehumidification heating area is also provided with at least one middle air outlet 2 and at least one bottom air outlet 3, the middle air outlet 2 is communicated with the middle part of the sludge drying area a, and the bottom air outlet 3 is communicated with the bottom of the sludge drying area a;
in the present invention, the dehumidifying heating zone b has at least three air ducts:
the air inlet end of the main air duct 4 is a first top-layer air return inlet 101, and the air outlet end of the main air duct 4 is a bottom-layer air outlet 3; the main air duct 4 is provided with a pre-cooling system evaporator 72, a main dehumidification system evaporator 82, and a pre-cooling system auxiliary condenser 75 in this order from the air intake direction to the air outlet direction.
The air inlet end of the inner balance first air duct 5 is a second top layer air return inlet 102, and the air outlet end is a middle layer air outlet 2; the inner balance first air duct 5 is provided with a pre-cooling system main condenser 74.
The air inlet end of the inner balance second air duct 6 is a third top-layer air return inlet 103, and the air outlet end of the inner balance second air duct 6 is also a bottom-layer air outlet 3; the inner balance second air duct 6 is provided with a main dehumidifying system condenser 83.
As shown in fig. 3, a pre-cooling system evaporator 72, a pre-cooling system main condenser 74, and a pre-cooling system auxiliary condenser 75 are connected to the same pre-cooling compression refrigeration system, specifically: the pre-cooling compression refrigeration system comprises a pre-cooling compressor 71, a pre-cooling system evaporator 72, a first expansion valve assembly 73, a pre-cooling system main condenser 74 and a pre-cooling system auxiliary condenser 75; the pre-cooling compressor 71, the pre-cooling system auxiliary condenser 75, the pre-cooling system main condenser 74, the expansion valve assembly I73 and the pre-cooling system evaporator 72 are sequentially connected end to end through pipelines to form an internal circulation compression refrigeration system;
as shown in fig. 4, the main dehumidifying system evaporator 82 and the main dehumidifying system condenser 83 are connected to the same main dehumidifying compression refrigeration system, specifically, the main dehumidifying compression refrigeration system includes a main dehumidifying compressor 81, a main dehumidifying system evaporator 82, a main dehumidifying system condenser 83 and a second expansion valve assembly 84, and the main dehumidifying compressor 81, the main dehumidifying system condenser 83, the second expansion valve assembly 84 and the main dehumidifying system evaporator 82 are sequentially connected end to end through another pipeline to form another internal circulation compression refrigeration system.
In this embodiment, in order to improve the working stability of the entire system, a system backup condenser may be further provided in the pre-cooling compression refrigeration system and the main dehumidification compression refrigeration system, for example:
the pre-cooling compression refrigeration system further comprises a system backup condenser 76 (see fig. 3) for emergency of system heat balance, the system backup condenser 76 is installed on the side wall or the top of the box body of the dehumidification heating area b and can discharge heat to the outside of the box body, and the system backup condenser 76 is arranged on a pipeline between the pre-cooling compressor 71 and the pre-cooling system auxiliary condenser 75 in parallel. Under normal operating conditions, the system backup condenser 76 is short-circuited and is not operated, and when the relevant sensor detects that the system load is too high or the temperature inside the system is too high, the pipeline connected in parallel with the system backup condenser 76 is closed, the system backup condenser 76 is started, and then heat is discharged out of the tank.
In the invention, the main condenser of the precooling system and the auxiliary condenser of the precooling system can be both one, the air outlet 2 of the middle layer and the air outlet 3 of the bottom layer are respectively provided with an induced draft fan 9 and an induced draft fan 10 for circulating air, and in the embodiment, the main air duct 4 and the inner balance second air duct 6 share one induced draft fan.
In addition, the bottom air outlet 3 is provided with an auxiliary heater 11 for further heating the hot air entering the bottom of the sludge drying zone to increase the temperature of the inlet air, and the auxiliary heater 11 is usually arranged on the air inlet side of the induced draft fan 10 of the bottom air outlet 3.
Of course, those skilled in the art will appreciate that the number and location of the three ducts, condensers, evaporators, and fans described above are merely exemplary and not limiting, such as: referring to fig. 2, the two main condensers of the pre-cooling system and the two auxiliary condensers of the pre-cooling system are both arranged in parallel, and the two main condensers of the pre-cooling system and the two auxiliary condensers of the pre-cooling system are arranged in parallel. The main air duct 4 and the inner balance second air duct 6 are independent fans, which are not described in detail herein.
The foregoing shows and describes the general principles and features of the present invention, together with the advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (5)
1. The utility model provides a system closed loop formula sludge dehumidifying drying system, includes the box, and the box is separated into sludge drying district and dehumidification zone of heating by the baffle, its characterized in that:
the dehumidification heating area is provided with a first top layer air return inlet and a bottom layer air outlet, the first top layer air return inlet is communicated with the top of the sludge drying area, and the bottom layer air outlet is communicated with the bottom of the sludge drying area;
the dehumidification heating area is provided with at least one air duct:
the air inlet end of the main air duct is a first top layer air return inlet, and the air outlet end of the main air duct is a bottom layer air outlet; a precooling system evaporator, a main dehumidification system evaporator and a precooling system auxiliary condenser are sequentially arranged on the main air duct from the air inlet direction to the air outlet direction;
the evaporator of the precooling system and the auxiliary condenser of the precooling system are connected into the same precooling compression refrigeration system, and the evaporator of the main dehumidifying system is connected into the main dehumidifying compression refrigeration system;
the dehumidification heating area is provided with at least one first top layer air return inlet, at least one second top layer air return inlet and at least one third top layer air return inlet, and the first top layer air return inlet, the second top layer air return inlet and the third top layer air return inlet are all communicated with the top of the sludge drying area;
the dehumidification heating area is also provided with at least one middle-layer air outlet and at least one bottom-layer air outlet, the middle-layer air outlet is communicated with the middle part of the sludge drying area, and the bottom-layer air outlet is communicated with the bottom of the sludge drying area;
the dehumidification heating area has at least three air channels:
the air inlet end of the main air duct is a first top layer air return inlet, and the air outlet end of the main air duct is a bottom layer air outlet; a precooling system evaporator, a main dehumidification system evaporator and a precooling system auxiliary condenser are sequentially arranged on the main air duct from the air inlet direction to the air outlet direction;
the air inlet end of the inner balance first air duct is a second top layer air return inlet, and the air outlet end of the inner balance first air duct is a middle layer air outlet; a precooling system main condenser is arranged on the inner balance first air channel;
the air inlet end of the inner balance second air duct is a third top layer air return inlet, and the air outlet end of the inner balance second air duct is also a bottom layer air outlet; a main dehumidification system condenser is arranged on the inner balance second air channel;
the evaporator of the precooling system, the main condenser of the precooling system and the auxiliary condenser of the precooling system are connected into the same precooling compression refrigeration system, and the evaporator of the main dehumidifying system and the condenser of the main dehumidifying system are connected into the same main dehumidifying compression refrigeration system.
2. The system closed-loop sludge dehumidifying and drying system as claimed in claim 1, wherein:
the pre-cooling compression refrigeration system comprises a pre-cooling compressor, a pre-cooling system evaporator, a first expansion valve assembly, a pre-cooling system main condenser and a pre-cooling system auxiliary condenser; the precooling compressor, the precooling system auxiliary condenser, the precooling system main condenser, the expansion valve assembly I and the precooling system evaporator are sequentially connected end to end through pipelines to form an internal circulation compression refrigeration system;
the main dehumidifying compression refrigeration system comprises a main dehumidifying compressor, a main dehumidifying system evaporator, a main dehumidifying system condenser and an expansion valve assembly II, wherein the main dehumidifying compressor, the main dehumidifying system condenser, the expansion valve assembly II and the main dehumidifying system evaporator are sequentially connected in an initial position through other pipelines to form another internal circulation compression refrigeration system.
3. The system closed-loop sludge dehumidifying and drying system as claimed in claim 2, wherein: the two main condensers of the pre-cooling system are arranged in parallel, and the two auxiliary condensers of the pre-cooling system are arranged in parallel.
4. The system closed-loop sludge dehumidifying and drying system as claimed in claim 2, wherein: the pre-cooling compression refrigeration system also comprises a system backup condenser for system heat balance exclusion emergency, the system backup condenser is arranged on a box body of the dehumidification heating area and used for releasing redundant heat of equipment due to no load or requirement, and the system backup condenser is arranged on a pipeline between the pre-cooling compressor and the pre-cooling system auxiliary condenser in parallel.
5. The system closed-loop sludge dehumidifying and drying system as claimed in claim 2, wherein: and the middle-layer air outlet and the bottom-layer air outlet are respectively provided with an induced draft fan.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910418241.0A CN110131987B (en) | 2019-05-20 | 2019-05-20 | System closed loop type sludge dehumidifying and drying system |
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| CN201910418241.0A CN110131987B (en) | 2019-05-20 | 2019-05-20 | System closed loop type sludge dehumidifying and drying system |
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| CN110131987B true CN110131987B (en) | 2020-10-27 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| DE102005062940A1 (en) * | 2005-12-29 | 2007-07-05 | BSH Bosch und Siemens Hausgeräte GmbH | A method for drying washing has a heat pump by which circulated air through the washing chamber is dried and heated and an additional heat pump evaporator is arranged to predry the circulated air stream |
| ITPN20080015A1 (en) * | 2008-02-27 | 2009-08-28 | Imat Spa | "HEAT PUMP LINEN DRYING MACHINE" |
| CN108585411B (en) * | 2018-04-18 | 2024-04-26 | 广东芬蓝环境科技有限公司 | Sludge drying system based on heat pump technology |
| CN208545289U (en) * | 2018-04-18 | 2019-02-26 | 广东芬尼克兹环保科技有限公司 | A kind of sludge drying system based on heat pump techniques |
| CN108503185A (en) * | 2018-06-08 | 2018-09-07 | 江苏申炬环保科技有限公司 | A kind of sludge removal moisture drying system |
| CN208419269U (en) * | 2018-06-26 | 2019-01-22 | 广州凯能电器科技有限公司 | A kind of air-cooled temperature control sludge drying system |
| CN109028916A (en) * | 2018-07-30 | 2018-12-18 | 上海伯涵热能科技有限公司 | A kind of heat pump drying device that efficient dehumidification module is pre-chilled than air inlet using different area air quantity |
| CN109553270B (en) * | 2018-12-06 | 2021-11-26 | 江苏天舒电器有限公司 | Heat pump type closed sludge drying system and control method thereof |
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