CN210764950U - Sludge drying equipment - Google Patents

Sludge drying equipment Download PDF

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Publication number
CN210764950U
CN210764950U CN201921627690.8U CN201921627690U CN210764950U CN 210764950 U CN210764950 U CN 210764950U CN 201921627690 U CN201921627690 U CN 201921627690U CN 210764950 U CN210764950 U CN 210764950U
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heat
drying chamber
condenser
sludge
temperature
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宋玉
李亚攀
何冬伟
赵成成
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Shanghai Techase Environment Protection Co ltd
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Shanghai Techase Environment Protection Co ltd
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    • YGENERAL 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
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    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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    • Y02E10/40Solar thermal energy, e.g. solar towers

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  • Treatment Of Sludge (AREA)

Abstract

The utility model discloses a sludge drying equipment. The equipment comprises a closed drying chamber, a heat pump system, a solar system and a water condenser; the top of the drying chamber is provided with a blanking hopper, the side surface of the lower part of the drying chamber is provided with a discharging spiral, and the drying chamber is internally provided with a transmission mesh belt with a rolling shaft; the heat pump system comprises an evaporator, a condenser, an expansion valve and a compressor; the solar system comprises a loop consisting of a heat collector, a heat storage water tank, a circulating pump, a heat exchanger, a control valve and a cooler which are connected in sequence; the bottom of the drying chamber is provided with a dry hot air inlet which is respectively connected with the outlet of the condenser and the outlet of the heat exchanger; a wet and cold air outlet is arranged at the top of the drying chamber and is respectively connected with an evaporator inlet and a heat exchanger inlet; the outlet of the evaporator is connected with the inlet of the condenser; the expansion valve and the compressor are respectively connected with the inlet of the evaporator and the outlet of the condenser. The sludge drying equipment can effectively improve the processing capacity of the low-temperature drying machine by effectively utilizing solar energy, reduce the operating cost and reduce the occupied area.

Description

Sludge drying equipment
Technical Field
The utility model belongs to the technical field of sludge drying handles, a sludge drying equipment is related to.
Background
Sludge is a byproduct of sewage treatment process, and is a complex heterogeneous colloid mainly composed of organic debris, inorganic particles, colloid, bacteria and the like. Along with the annual increase of sewage treatment capacity, the discharge standard is continuously improved, the sludge yield is increased year by year, and the treatment requirement is more strict. In recent years, sludge reduction has become a popular treatment method in the market by a heat treatment method such as steam drying or heat pump drying, in addition to sludge reduction treatment by a conventional mechanical filter pressing method such as a centrifuge or a plate and frame machine.
Steam drying is a condition which is difficult to reach by a common municipal sewage treatment plant or a part of industrial sewage treatment plants because energy sources such as natural gas or coal are used for providing hot air, and is suitable for enterprises with cogeneration or enterprises with residual steam. The application of steam drying is limited.
The heat pump drying is a technology for drying sludge by converting electric energy into heat energy. The novel LED lamp is attractive in appearance, convenient to install and simple to operate, and is accepted by more customers. The heat pump drying equipment is most commonly in a belt conveying form, and also has a box type, a multilayer belt type and the like. The dryer is called a low-temperature dryer because the working temperature of about 60-80 ℃ is generally adopted.
The low-temperature drier has the working principle that low-level heat energy is converted into high-level heat energy by a heat pump and converted into heat energy by means of electric energy consumption. Much of the electrical energy is wasted due to efficiency limitations of the energy conversion facility. Due to the limitation of a heat pump unit, the low-temperature drier has lower processing capacity; as the amount of processing increases, the size of the equipment needs to be excessively increased. The low-temperature drier which is mature in the market at present can electrically dry (evaporate) 1.5-3 kilograms of water at 1 ℃.
In a word, the energy efficiency ratio of the traditional low-temperature drying machine is low, and the process of converting electric energy into heat energy is limited by the energy transfer efficiency, so that energy is wasted. And the treatment efficiency of the low-temperature drying machine is not high due to the limitation of the heat pump unit. As the processing capacity is increased, the occupied area of the whole machine is also excessively increased. In order to improve the working efficiency of the low-temperature drying machine and reduce the occupied area, the low-temperature drying machine needs to be designed, and the drying effect is realized by utilizing two energy forms of solar energy and electric energy. By effectively utilizing solar energy, the consumption of electric energy can be reduced.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome the not enough of prior art, provide a sludge drying equipment that effectively utilizes solar energy, can reduce the consumption to the electric energy. The sludge drying equipment can simultaneously use solar energy and electric energy as heat energy conversion sources, and can also independently use the solar energy as the heat energy conversion sources.
The technical scheme of the utility model as follows:
a sludge drying device (low-temperature dryer) comprises: a closed drying chamber, a heat pump system, a solar system and a water condenser; the top of the drying chamber is provided with a blanking hopper, the side surface of the lower part of the drying chamber is provided with a discharging spiral, and the inside of the drying chamber is provided with a transmission mesh belt with a rolling shaft; the heat pump system comprises an evaporator, a condenser, an expansion valve and a compressor; the solar system comprises a water circulation loop consisting of a heat collector, a heat storage water tank, a circulating pump, a heat exchanger, a control valve and a cooler which are connected in sequence; the bottom of the drying chamber is provided with a dry hot air inlet; a wet and cold air outlet is arranged at the top of the drying chamber; a wet and cold air outlet at the top of the drying chamber is respectively connected with an evaporator inlet and a water condenser inlet; the outlet of the evaporator is connected with the inlet of the condenser; the outlet of the condenser is connected with a dry hot air inlet at the bottom of the drying chamber; the expansion valve and the compressor are respectively connected with the inlet of the evaporator and the outlet of the condenser; the inlet of the heat exchanger is connected with the outlet of the water condenser, and the outlet of the heat exchanger is connected with the dry hot air inlet at the bottom of the drying chamber.
Furthermore, the sludge drying equipment also comprises a PLC control system, wherein the PLC control system comprises a PLC controller and a temperature transmitter; a dry hot air outlet of the heat exchanger is provided with a temperature transmitter, and the temperature transmitter is connected with an input end of the PLC; the control valve is connected with the output end of the PLC; the PLC controller can control the temperature of the hot and dry air after heat exchange by the heat exchanger by controlling the opening of the control valve according to a signal transmitted from the temperature transmitter.
Furthermore, the heat collector comprises a solar panel, and a heat collecting water pipe is welded below the solar panel.
Furthermore, a fan is arranged at a dry hot air inlet at the bottom of the drying chamber to push air to flow into the drying chamber.
Furthermore, an oblique-angle gradient flow guide structure is arranged in the drying chamber close to the dry hot air inlet, so that the dry hot air can be guided to enter the lower surface of the transmission mesh belt.
The working principle and the operation mode of the sludge drying equipment (low temperature drying machine) are as follows:
(1) the sludge firstly enters a drying chamber through a blanking hopper and falls on a transmission mesh belt;
(2) when the sludge is moved along with the transmission of the transmission mesh belt, dry hot air below the transmission mesh belt passes through the transmission mesh belt, and heat exchange is carried out in the contact process of the dry hot air and the sludge, so that the moisture in the sludge is taken away, and the sludge is dried;
(3) wet cold air with moisture after heat exchange with sludge comes out from the top of the drying chamber, one path of the wet cold air is conveyed to an evaporator of a heat pump system through a pipeline, and the other path of the wet cold air is conveyed to a heat exchanger of a solar system after being condensed by a water condenser;
(4) a heat pump system: the wet cold air entering the evaporator is acted by the evaporator, water vapor is condensed into condensed water to be discharged, the wet cold air is further cooled to be dry cold air, the dry cold air enters the condenser, heat is absorbed in the condenser to form dry hot air, and then the dry hot air is circulated to the lower part of the transmission mesh belt through a pipeline and heats the sludge again; under the action of the compressor, the refrigerant forms circulation between the evaporator and the condenser and exchanges heat with air twice;
(5) condensing wet cold air entering a water condenser, enabling moisture in the wet cold air to form condensed water under the action of the water condenser to be discharged, enabling the condensed water to enter a heat exchanger to exchange heat with hot water in a solar system to form dry hot air, and then circulating the dry hot air to the lower part of a transmission mesh belt through a pipeline and reheating sludge;
(6) a solar energy system: the heat collector absorbs the solar energy and converts the solar energy into heat of hot water, and the heat is stored in the heat storage water tank; under the action of a circulating pump, water in the heat storage water tank enters the heat exchanger and exchanges heat with wet and cold air; the warm water after temperature reduction (heat transfer) enters a cooler through a control valve to be cooled, and cold water is formed and enters a heat collector again.
A sludge drying treatment method using the sludge drying equipment (low-temperature dryer) comprises the following steps:
the sludge is conveyed into a blanking hopper of the drying chamber through a screw conveyor, enters the drying chamber and falls on a transmission mesh belt; under the drive of the roller, the transmission mesh belt stably and continuously operates at a certain speed, and the sludge moves along with the transmission mesh belt; the lower end of the transmission mesh belt continuously enters dry hot air (the temperature is 50-70 ℃ and/or 50-80 ℃), passes through the transmission mesh belt and moves towards the upper end; the dry hot air is contacted with the sludge in the process of passing through the transmission mesh belt to exchange heat, and the moisture in the sludge is evaporated and enters the dry hot air, so that the moisture content of the sludge is reduced;
wet cold air (with the temperature of 30-35 ℃) with moisture after heat exchange with the sludge comes out from the top of the drying chamber, one path of the wet cold air is conveyed to an evaporator of a heat pump system through a pipeline, and the other path of the wet cold air is conveyed to a heat exchanger of a solar system after being condensed by a water condenser;
the wet cold air entering the evaporator is condensed into condensed water to be discharged under the action of the evaporator, and the air is cooled to become dry cold air (the temperature is below 20 ℃) and then enters the condenser; absorbing heat in the condenser to form dry hot air (with the temperature of 50-70 ℃), circulating the dry hot air to the lower part of the transmission mesh belt through a pipeline and reheating the sludge;
the wet cold air entering the water condenser forms condensed water under the action of the water condenser, the condensed water is discharged to form dry cold air (the temperature is below 20 ℃), the dry cold air enters the heat exchanger and exchanges heat with hot water in the solar system to form dry hot air (the temperature is 50-80 ℃), and the dry hot air is circulated back to the lower part of the transmission mesh belt through a pipeline and reheats the sludge.
Furthermore, in the solar energy system, a heat collector absorbs solar energy and converts the solar energy into heat of hot water, and the heat is stored in a heat storage water tank; hot water with the temperature of 85-100 ℃ in the hot water storage tank enters the heat exchanger through the circulating pump, is subjected to heat exchange with wet cold air to be cooled into warm water with the temperature of 30-40 ℃, enters the cooler through the control valve to be cooled into cold water with the temperature of 15-25 ℃, enters the heat collector again, absorbs solar energy, is converted into hot water with the temperature of 85-100 ℃, and is stored in the hot water storage tank.
Furthermore, the temperature of wet cold air with moisture after heat exchange with the sludge is 30-35 ℃, and the temperature of dry cold air after condensation and temperature reduction is below 20 ℃; the evaporator of the heat pump system can heat the condensed and cooled dry and cold air to 50-70 ℃, and the heat exchanger of the solar system can heat the condensed and cooled dry and cold air to 50-80 ℃; the temperature can be automatically adjusted through the PLC control system, namely, the PLC controller controls the temperature of the hot and dry air after heat exchange of the heat exchanger through controlling the opening of the control valve according to a signal transmitted from the temperature transmitter, namely, the PLC controller controls the temperature of the hot and dry air after heat exchange of the heat exchanger through controlling the flow of warm water.
Further, wet cold air with the temperature of 30-35 ℃ entering the evaporator is condensed into condensed water under the action of the evaporator and is discharged, the wet cold air is further cooled into dry cold air with the temperature of below 20 ℃, and then enters the condenser, and the dry cold air with the temperature of 50-70 ℃ is formed by heat absorption in the condenser, and then is circulated back to the lower part of the transmission mesh belt through a pipeline to heat the sludge again.
Furthermore, wet cold air with the temperature of 30-35 ℃ entering a water condenser is condensed by the water condenser to become dry cold air with the temperature below 20 ℃, then enters a heat exchanger to exchange heat with hot water in a solar system to form dry hot air with the temperature of 50-80 ℃, and then is circulated to the lower part of the transmission mesh belt through a pipeline to reheat sludge.
The utility model has the advantages that:
the utility model discloses a sludge drying equipment effectively utilizes solar energy, can reduce the consumption to the electric energy. The sludge drying equipment can realize sludge drying by utilizing two energy forms of solar energy and electric energy. Two groups of reaction systems using solar energy and electric energy as energy sources can be used simultaneously or independently. By effectively utilizing the solar energy, the processing capacity of the low-temperature drying machine can be effectively improved, and the operating cost is reduced.
The utility model discloses a sludge drying equipment (low temperature mummification machine), the advantage of comparing with current low temperature mummification machine is:
1. effectively improve equipment treatment efficiency and increase treatment capacity.
2. The solar energy is utilized, the electric energy consumption is reduced, the energy is saved, the environment is protected, and the operating cost is reduced.
3. Under the same processing capacity, the occupied area of the whole machine is reduced.
4. The utility model relates to a low temperature drying machine can realize the electric drying of 5-6 kilograms of water at 1 degree.
Drawings
Fig. 1 is a schematic structural diagram of the sludge drying apparatus of the present invention.
In the figure: the system comprises a drying chamber 1, a blanking hopper 2, a transmission mesh belt (with rollers) 3, a discharge screw 4, an evaporator 5, a condenser 6, an expansion valve 7, a compressor 8, a heat exchanger 9, a circulating pump 10, a heat storage water tank 11, a heat collector 12, a control valve 13, a cooler 14, a dry and hot air inlet 15, a wet and cold air outlet 16, a fan 17 and a water condenser 18.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and examples.
Example 1
As shown in fig. 1, the utility model relates to a sludge drying device (low temperature dryer), which comprises a closed drying chamber 1, a heat pump system, a solar energy system, and a water condenser 18; the top of the drying chamber 1 is provided with a blanking hopper 2, the side surface of the lower part of the drying chamber 1 is provided with a discharging screw 4, and a transmission mesh belt 3 with a rolling shaft is arranged in the drying chamber 1; the heat pump system comprises an evaporator 5, a condenser 6, an expansion valve 7 and a compressor 8; the solar system comprises a water circulation loop consisting of a heat collector 12, a heat storage water tank 11, a circulating pump 10, a heat exchanger 9, a control valve 13 and a cooler 14 which are connected in sequence; the bottom of the drying chamber 1 is provided with a dry hot air inlet 15; the top of the drying chamber 1 is provided with a wet and cold air outlet 16; a wet and cold air outlet 16 at the top of the drying chamber 1 is respectively connected with an inlet of the evaporator 5 and an inlet of the water condenser 18; the outlet of the evaporator 5 is connected with the inlet of the condenser 6; the outlet of the condenser 6 is connected with a dry hot air inlet 15 at the bottom of the drying chamber; the expansion valve 7 and the compressor 8 are respectively connected with the inlet of the evaporator 5 and the outlet of the condenser 6; the inlet of the heat exchanger 9 is connected with the outlet of the water condenser 18, and the outlet of the heat exchanger 9 is connected with the dry hot air inlet 15 at the bottom of the drying chamber 1.
The sludge drying equipment also comprises a PLC control system, wherein the PLC control system comprises a PLC controller, a temperature transmitter and a control valve 13; a dry hot air outlet of the heat exchanger 9 is provided with a temperature transmitter, and the temperature transmitter is connected with an input end of the PLC; the control valve 13 is connected with the output end of the PLC; the PLC controller controls the temperature of the hot and dry air heat-exchanged by the heat exchanger 9 by controlling the opening of the control valve 13 according to a signal transmitted from the temperature transmitter.
The heat collector 12 comprises a solar panel, and a heat collecting water pipe is welded below the solar panel.
A fan 17 is arranged at a dry hot air inlet 15 at the bottom of the drying chamber 1 to push air to flow into the drying chamber 1.
An oblique-angle gradient flow guide structure is arranged in the drying chamber 1 close to the hot and dry air inlet 15, so that the hot and dry air can be guided to enter the lower surface of the transmission mesh belt.
The working principle and the operation mode of the sludge drying equipment (low-temperature drier) of the utility model are as follows:
1. sludge firstly enters a drying chamber 1 through a blanking hopper 2 and falls on a transmission mesh belt 3;
2. when the sludge is moved along with the transmission of the transmission mesh belt 3, the dry hot air below the transmission mesh belt 3 passes through the transmission mesh belt 3, and heat exchange is carried out in the contact process of the dry hot air and the sludge, so that the moisture in the sludge is taken away, and the sludge is dried;
3. wet cold air (with the temperature of 30-35 ℃) with moisture after heat exchange with the sludge is discharged from the top of the drying chamber, one path of the wet cold air is conveyed to an evaporator of a heat pump system through a pipeline, and the other path of the wet cold air is conveyed to a heat exchanger 9 of a solar system after being condensed by a water condenser 18;
4. a heat pump system: the wet cold air (with the temperature of 30-35 ℃) entering the evaporator 5 is acted by the evaporator 5, the water vapor is condensed into condensed water to be discharged, the wet cold air is further cooled into dry cold air (with the temperature of below 20 ℃) and then enters the condenser 6, the dry hot air (with the temperature of 50-70 ℃) is formed by absorbing heat in the condenser 6, and then the dry hot air is circulated to the lower part of the transmission mesh belt 3 through a pipeline to heat the sludge again; the refrigerant circulates between the evaporator 5 and the condenser 6 by the action of the compressor 8, and exchanges heat with air twice.
5. The wet cold air (with the temperature of 30-35 ℃) entering the water condenser 18 is condensed in the water condenser 18, the moisture in the wet cold air forms condensed water under the action of the water condenser 18 and is discharged to form dry cold air (with the temperature of below 20 ℃), the dry cold air enters the heat exchanger 9 and exchanges heat with the hot water in the solar system to form dry hot air (with the temperature of 50-80 ℃), and then the dry hot air is circulated back to the lower part of the transmission mesh belt 3 through the pipeline to reheat the sludge.
6. A solar energy system: the heat collector 12 absorbs the solar energy and converts the solar energy into heat of hot water, and the heat is stored in the heat storage water tank 11; under the action of a circulating pump 10, water (with the temperature of 85-100 ℃) in a heat storage water tank 11 enters a heat exchanger 9 and becomes warm water (with the temperature of 30-40 ℃) after heat exchange with wet cold air; the warm water after heat transfer enters the cooler 14 through the control valve 13 (the PLC can control the temperature of the hot dry air after heat exchange by the heat exchanger 9 by controlling the flow of the warm water) to be cooled, and cold water (the temperature is 15-25 ℃) is formed and then enters the heat collector 12 again.
The cooler 14 is arranged to protect the pipeline and the rear-end equipment (the heat collector 12) and to further cool the pipeline and the rear-end equipment (the heat collector 12) through the cooler 14, so that the system operation condition is better, and the heat collector (a solar panel) has large temperature difference change and higher heat absorption speed; if the temperature is originally 30 to 50 degrees, the absorption of solar heat may be slow.
Example 2
A sludge drying treatment method using the sludge drying equipment (low-temperature dryer) of the embodiment 1 of the utility model is as follows:
conveying the sludge with the water content of more than 80% into a blanking hopper 2 of a drying chamber 1 through a screw conveyor; the sludge gradually falls on the transmission mesh belt 3 at a certain speed, and the transmission mesh belt 3 stably and continuously operates at a certain speed under the drive of the rollers, so that the sludge moves along with the transmission mesh belt; the lower end of the transmission mesh belt 3 continuously enters dry hot air with the temperature of 50-70 ℃ and/or 50-80 ℃, passes through the transmission mesh belt 3 and moves towards the upper end; the dry hot air contacts with the sludge in the process of passing through the transmission mesh belt 3 to exchange heat, and the water in the sludge is evaporated and enters the dry hot air, so that the water content of the sludge is reduced; when the sludge is conveyed by the transmission mesh belt 3 and enters the discharge screw 4 at the lower part of the drying chamber 1, the water content of the sludge is reduced to below 30 percent;
wet cold air (with the temperature of 30-35 ℃) with moisture after heat exchange with the sludge comes out from the top of the drying chamber 1, one path of the wet cold air is conveyed to an evaporator 5 of a heat pump system through a pipeline, and the other path of the wet cold air is conveyed to a heat exchanger 9 of a solar system after being condensed by a water condenser 18;
the wet cold air (with the temperature of 30-35 ℃) entering the evaporator 5 is acted by the evaporator 5, the water vapor is condensed into condensed water to be discharged, the air is cooled to become dry cold air (with the temperature of below 20 ℃), and then the dry cold air enters the condenser 6; absorbing heat in the condenser 6 to form dry hot air (with the temperature of 50-70 ℃), circulating the dry hot air to the lower part of the transmission mesh belt 3 through a pipeline and reheating the sludge;
the wet cold air (with the temperature of 30-35 ℃) entering the water condenser 18 forms condensed water through the action of the water condenser 18, the condensed water is discharged to form dry cold air (with the temperature of below 20 ℃), the dry cold air enters the heat exchanger 9 and exchanges heat with hot water in the solar system to form dry hot air (with the temperature of 50-80 ℃), and the dry hot air returns to the lower part of the transmission mesh belt 3 through a pipeline and heats sludge again.
In the solar energy system, the heat collector 12 absorbs the solar energy and converts the solar energy into the heat of hot water, and the heat is stored in the heat storage water tank 11; under the action of the circulating pump 10, hot water with the temperature of 85-100 ℃ in the heat storage water tank 11 enters the heat exchanger 9, is subjected to heat exchange with wet cold air to be cooled into warm water with the temperature of 30-40 ℃, enters the cooler 14 through the control valve 13 to be cooled into cold water with the temperature of 15-25 ℃, enters the heat collector 12 again, absorbs solar energy and is converted into hot water with the temperature of 85-100 ℃ to be stored in the heat storage water tank 11.
The temperature of wet cold air with moisture after heat exchange with the sludge is 30-35 ℃, and the temperature of dry cold air after condensation and temperature reduction is below 20 ℃; the evaporator of the heat pump system can heat the condensed and cooled dry and cold air to 50-70 ℃, and the heat exchanger of the solar system can heat the condensed and cooled dry and cold air to 50-80 ℃; the temperature can be automatically adjusted by an electric control system (through a PLC control system), namely, the PLC controls the temperature of the hot and dry air after heat exchange of the heat exchanger by controlling the opening of the control valve according to a signal transmitted from the temperature transmitter, namely, the PLC controls the temperature of the hot and dry air after heat exchange of the heat exchanger by controlling the flow of warm water.
Example 3
An application example of the low-temperature dryer of the embodiment 1 to drying treatment of sludge according to the method of the embodiment 2 is as follows:
20 tons of sludge are produced in a certain sewage treatment plant in Zhejiang daily, and the water content is 80 percent.
The low temperature dryer of example 1 was designed for treatment. The low-temperature drying machine structurally comprises a closed drying chamber 1, a blanking hopper 2, a transmission mesh belt 3 with a rolling shaft, a discharge spiral 4, an evaporator 5, a condenser 6, an expansion valve 7, a compressor 8, a heat exchanger 9, a circulating pump 10, a heat storage water tank 11, a heat collector 12, a control valve 13, a cooler 14, a fan 17 and a water condenser 18.
The drying treatment process comprises the following steps:
conveying the sludge with the water content of 80 percent on site into a blanking hopper 2 of a drying chamber 1 through a screw conveyor; the sludge gradually falls on the transmission mesh belt 3 at a certain speed, and the transmission mesh belt 3 stably and continuously runs at a certain speed under the drive of the rollers, so that the sludge moves along with the transmission mesh belt; the lower end of the transmission mesh belt 3 continuously enters dry hot air with the temperature of 65 ℃, passes through the transmission mesh belt 3 and moves towards the upper end; the dry hot air contacts with the sludge in the process of passing through the transmission mesh belt 3 to exchange heat, and the water in the sludge is evaporated and enters the dry hot air, so that the water content of the sludge is reduced; when the sludge is conveyed by the transmission mesh belt 3 and enters the discharge screw 4 at the lower part of the drying chamber 1, the water content of the sludge is reduced to below 30 percent;
wet cold air (with the temperature of 30 ℃) with moisture after heat exchange with the sludge comes out from the top of the drying chamber, one path of the wet cold air is conveyed to an evaporator 5 of a heat pump system through a pipeline, and the other path of the wet cold air is conveyed to a heat exchanger 9 of a solar system after being condensed by a water condenser 18;
the wet cold air (temperature is 30 ℃) entering the evaporator 5 is acted by the evaporator 5, the water vapor is condensed into condensed water to be discharged, the air is cooled to become dry cold air (temperature is below 20 ℃), and the dry cold air enters the condenser 6; absorbing heat in the condenser 6 to form dry hot air (temperature 65 ℃), circulating the dry hot air to the lower part of the transmission mesh belt 3 through a pipeline and reheating the sludge;
the wet cold air (with the temperature of 30 ℃) entering the water condenser 18 forms condensed water through the action of the water condenser 18, the condensed water is discharged to form dry cold air (with the temperature of below 20 ℃), the dry cold air enters the heat exchanger 9 and exchanges heat with hot water in the solar system to form dry hot air (with the temperature of 65 ℃), and the dry hot air returns to the lower part of the transmission mesh belt 3 through a pipeline and heats sludge again;
in the solar energy system, the heat collector 12 absorbs the solar energy and converts the solar energy into the heat of hot water, and the heat is stored in the heat storage water tank 11; hot water with the temperature of 95 ℃ in the heat storage water tank 11 enters the heat exchanger 9 through the circulating pump 10, is subjected to heat exchange with wet cold air to be cooled into warm water with the temperature of 40 ℃, enters the cooler 14 through the control valve 13 to be cooled into cold water with the temperature of 20 ℃, enters the heat collector 12 again, absorbs solar energy, is converted into hot water with the temperature of 95 ℃, and is stored in the heat storage water tank 11.
Above-mentioned mummification treatment process calculates according to the energy consumption of ordinary low temperature mummification machine, need consume 5000 degrees electricity, and adopts the utility model provides a low temperature mummification machine, because of effectively having utilized solar energy, so, only need consume 2500 degrees electricity. Effectively saving the operating cost.

Claims (5)

1. A sludge drying device is characterized by comprising: a closed drying chamber, a heat pump system, a solar system and a water condenser; the top of the drying chamber is provided with a blanking hopper, the side surface of the lower part of the drying chamber is provided with a discharging spiral, and the inside of the drying chamber is provided with a transmission mesh belt with a rolling shaft; the heat pump system comprises an evaporator, a condenser, an expansion valve and a compressor; the solar system comprises a water circulation loop consisting of a heat collector, a heat storage water tank, a circulating pump, a heat exchanger, a control valve and a cooler which are connected in sequence; the bottom of the drying chamber is provided with a dry hot air inlet; a wet and cold air outlet is arranged at the top of the drying chamber; a wet and cold air outlet at the top of the drying chamber is respectively connected with an evaporator inlet and a water condenser inlet; the outlet of the evaporator is connected with the inlet of the condenser; the outlet of the condenser is connected with a dry hot air inlet at the bottom of the drying chamber; the expansion valve and the compressor are respectively connected with the inlet of the evaporator and the outlet of the condenser; the inlet of the heat exchanger is connected with the outlet of the water condenser, and the outlet of the heat exchanger is connected with the dry hot air inlet at the bottom of the drying chamber.
2. The sludge drying apparatus of claim 1, wherein the sludge drying apparatus further comprises a PLC control system, the PLC control system comprising a PLC controller and a temperature transmitter; a dry hot air outlet of the heat exchanger is provided with a temperature transmitter, and the temperature transmitter is connected with an input end of the PLC; the control valve is connected with the output end of the PLC; the PLC controller can control the temperature of the hot and dry air after heat exchange by the heat exchanger by controlling the opening of the control valve according to a signal transmitted from the temperature transmitter.
3. The sludge drying equipment as claimed in claim 1 or 2, wherein the heat collector comprises a solar panel, and a heat collecting water pipe is welded below the solar panel.
4. The sludge drying apparatus as claimed in claim 1 or 2, wherein a fan is provided at the hot and dry air inlet at the bottom of the drying chamber.
5. The sludge drying apparatus of claim 1 or 2, wherein an oblique-angle gradient flow guide structure is arranged in the drying chamber near the dry hot air inlet.
CN201921627690.8U 2019-09-27 2019-09-27 Sludge drying equipment Active CN210764950U (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110526546A (en) * 2019-09-27 2019-12-03 上海同臣环保有限公司 Sludge drying device and sludge drying processing method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110526546A (en) * 2019-09-27 2019-12-03 上海同臣环保有限公司 Sludge drying device and sludge drying processing method

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