CN109626791B - Sludge drying equipment and sludge drying method - Google Patents

Sludge drying equipment and sludge drying method Download PDF

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Publication number
CN109626791B
CN109626791B CN201910091433.5A CN201910091433A CN109626791B CN 109626791 B CN109626791 B CN 109626791B CN 201910091433 A CN201910091433 A CN 201910091433A CN 109626791 B CN109626791 B CN 109626791B
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gas
sludge
drying
heat
heat pump
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CN109626791A (en
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王婷婷
孙浩
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Everbright Cleaning Technology Co.,Ltd.
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BEIJING ZHONGKUANG ENVIRONMENTAL PROTECTION TECHNOLOGY CO LTD
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    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00Treatment of sludge; Devices therefor
    • C02F11/12Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2303/00Specific treatment goals
    • C02F2303/10Energy recovery

Abstract

The invention relates to a sludge drying device and a sludge drying method, wherein the sludge drying device comprises: a heat pump into which process water from a sewage treatment system is fed; the drying device is used for conveying the sludge into the drying device for drying; the gas adjusting device is connected to the drying device to form a closed system, gas for drying sludge flows in the closed system in a circulating mode, saturated evaporation moisture generated in the sludge drying process enters the gas adjusting device from the drying device, the gas adjusting device dehumidifies and dries the saturated evaporation moisture, the gas after dehumidification and drying is heated into hot air by using a heat exchange medium discharged from the gas cooler side of the heat pump, and then the hot air is sent into the drying device to dry the sludge.

Description

Sludge drying equipment and sludge drying method
Technical Field
The invention relates to sludge drying equipment and a sludge drying method, which are used for drying sludge by utilizing process water of a sewage treatment system.
Background
With the acceleration of the urbanization process, while the urban sewage treatment capacity is greatly improved, a large amount of by-products, namely urban sludge is generated, and if the sludge is not treated properly, environmental pollution is caused, for example, leachate generated by the sludge can cause pollution of soil and underground water, malodorous gas and sludge particles emitted by the sludge can cause air pollution, and finally harm can be caused to organisms. Moreover, municipal sludge has high water content, large volume and unstable properties, and is not beneficial to transportation and treatment.
On the other hand, the municipal sludge contains a large amount of organic matters and lignin, and the calorific value can reach more than eight hundred and thousands of cokes per kilogram after dehydration treatment. After the sludge is dried, the sludge can be thoroughly and effectively treated by an incineration mode, so that the sludge is reduced to the maximum extent, and meanwhile, heat energy generated during incineration can be utilized to convert the heat energy into electric energy for power generation, thereby realizing the reutilization of resources. The dried sludge can also be used for preparing building bricks and the like or directly buried and the like.
In order to effectively treat the municipal sludge and realize the resource utilization of the municipal sludge, a sludge drying link is indispensable. However, the existing drying technology needs to consume a large amount of energy, the drying equipment is complex, the operation energy consumption is high, a large amount of odor is generated in the drying process, and potential safety hazards such as dust explosion exist. Therefore, the development of more economical and energy-saving drying technology becomes an urgent need for municipal sludge treatment.
Disclosure of Invention
The invention aims to provide an improved sludge drying device and a sludge drying method, which can realize the drying of sludge economically, energy-saving and environmentally friendly through the sludge drying device with simple and compact structure and high integration level.
According to one aspect of the invention, the above object is achieved by a sludge drying apparatus according to the invention, comprising:
a heat pump into which process water from a sewage treatment system is fed;
the drying device is used for conveying the sludge into the drying device for drying;
the gas adjusting device is connected to the drying device to form a closed system, and gas for drying the sludge flows in the closed system in a circulating manner, wherein the gas adjusting device is used for adjusting the temperature and humidity of the gas;
saturated evaporation moisture generated in the sludge drying process enters the gas regulating device from the drying device, the saturated evaporation moisture is dehumidified and dried by the gas regulating device, the dehumidified and dried gas is heated into hot air by using a heat exchange medium discharged from the side of the air cooler of the heat pump, and then the hot air is sent into the drying device to dry sludge.
"Process water" refers to water in various wastewater treatment stages of a wastewater treatment system, such as a wastewater treatment plant, including influent water, effluent water, and water in various intermediate stages. For example, municipal sewage contains a large amount of low-level heat energy, and the municipal sewage has stable water amount and small water temperature change range, is a very stable heat source in winter and in summer at thirty degrees, and can further excavate the energy-saving potential of sewage plants by utilizing the latent heat in the municipal sewage (process water) to realize the optimal utilization of the energy of the sewage plants.
A "heat pump" is a device that transfers heat energy from a low level heat source to a high level heat source and may include an evaporator, a compressor, an air cooler, a pressure reducing valve, and the like. The process water is sent into the evaporator of the heat pump, exchanges heat with the working medium of the heat pump in the evaporator and then flows out of the heat pump, after heat exchange, the process water with the temperature of about 10-30 ℃ can be reduced to about 5-10 ℃, and the process water with the low temperature is sent into the gas regulating device to dehumidify and dry saturated evaporation moisture generated in the drying process. Meanwhile, the heat pump working medium absorbing the latent heat of the process water enters the compressor, is compressed and pressurized into a high-temperature and high-pressure heat pump working medium, exchanges heat with a heat exchange medium such as soft water in the air cooler, and the heat exchange medium absorbs the heat of the high-temperature and high-pressure heat pump working medium to increase the temperature. The heat exchange medium with the increased temperature (which can reach about 90 ℃) can be sent into a gas regulating device to heat cold air into hot air for drying sludge.
The drying device may be, for example, a low temperature drying device.
Compared with the prior art, according to the invention, the gas regulating device is connected with the drying device to form a closed system, so that the closed infinite circulation of the process condensed gas is realized, no odor is leaked to the external environment, and meanwhile, the heat energy is recycled, so that the sludge moisture is evaporated in multiple effects; the gas conditioning device heats gas into hot air by utilizing the heat energy absorbed by the heat pump from the sewage, thereby realizing low-consumption and environment-friendly sludge drying.
Compared with the prior drying technology, the sludge drying equipment provided by the invention has the following advantages: the infinite circulation of the process condensed gas, the cyclic utilization of heat energy and the multi-effect evaporation of sludge moisture are realized; the whole set of equipment adopts a closed design, has no odor overflow, is dried at low temperature without dust, does not need sludge granulation and material returning, does not need to increase secondary cost, is provided with an expensive deodorization system and a dust removal system, can be directly arranged in a plant area of a sewage treatment system, carries out centralized treatment on sludge, and directly discharges condensed water without secondary treatment; the whole set of equipment has simple and compact structure.
According to a preferred embodiment of the present invention, the gas conditioning device may dehumidify and dry the saturated evaporation moisture using the heat-exchanged process water discharged from the evaporator side of the heat pump. Therefore, on one hand, the heat pump is used for fully extracting a large amount of waste heat in the process water of each stage of the sewage treatment system to dry the sludge, on the other hand, the process water subjected to heat exchange in the heat pump evaporator is continuously used for dehumidifying and drying the damp and hot steam generated in the drying process, and the integration level of the whole set of sludge drying equipment is high.
Preferably, the gas conditioning device may include a condenser through which the saturated evaporation moisture is dehumidified and dried, and the process water discharged from the evaporator side of the heat pump flows into the condenser, passes through the condenser, and is discharged.
Further preferably, the gas conditioning device may include a plurality of condensers, the saturated evaporation moisture is subjected to multistage dehumidification and drying by the plurality of condensers, and the process water discharged from the evaporator side of the heat pump is fed to the plurality of condensers, flows through the corresponding condensers, and is discharged, for example, returned to the water taking point of the process water. Here, the number of condensers to be provided in the gas conditioning system may be calculated according to the requirements of various technical parameters such as sludge and water temperature. Through multi-stage dehumidification and drying, gas which can be used for drying the sludge and is fully dried is generated.
Further preferably, the gas conditioning device may include a controller and a sensor disposed after the last-stage condenser, the sensor being configured to acquire humidity of the dried gas, and the controller may control to open valves of one or more condensers of the plurality of condensers according to the humidity of the dried gas. Further preferably, a humidity sensor may be provided at a corresponding position after the last stage condenser for detecting humidity of the dried gas. Alternatively, a temperature sensor may be provided for calculating the humidity of the dried gas. The opening and closing of the valves of the condensers are controlled by, for example, a PLC according to the signals of the sensors, if the signals of the sensors show that the gas humidity exceeds the standard, the PLC automatically opens the valves of one or more condensers, and the number of the opened valves is closely related to the gas humidity.
The dehumidification and drying effect of saturated evaporation moisture is one of main influence factors of sludge drying, and the dehumidification effect is directly influenced due to seasonal changes, unstable sludge moisture content and the like. The control system of the gas adjusting device can well adjust the air humidity by increasing or decreasing the opening number of the condensers, and the stability of products (sludge discharge) is ensured.
Preferably, the gas conditioning device may further comprise a dehumidification pump arranged in series or in parallel with the condenser. When the dehumidifying pump is connected in series with the condenser, the dehumidifying pump may be disposed before or after the condenser, and the saturated evaporated moisture passes through the dehumidifying pump and the condenser in sequence, whereby the saturated evaporated moisture can be sufficiently dehumidified and dried. When the dehumidification pump is in parallel with the condenser, at least a portion of the saturated vaporized moisture passes through the condenser and another portion of the saturated vaporized moisture passes through the dehumidification pump. In this way, the dehumidification pump can be used as a supplement to the condenser to achieve sub-drying of the saturated evaporation humidity.
Further preferably, the gas conditioning device may further include a controller and a sensor, the sensor is disposed behind a dehumidification system formed by the dehumidification pump and the condenser and is configured to acquire humidity of the dehumidified and dried gas, and the controller controls and adjusts the condenser and/or the dehumidification pump according to the humidity of the dehumidified and dried gas.
According to a preferred embodiment of the present invention, the gas conditioning device may include a dehumidifying pump by which the saturated evaporation moisture is dehumidified and dried. For example, the saturated evaporation moisture may be dehumidified and dried only by the dehumidification pump. By the mode, the sludge drying equipment with a simpler structure can be realized.
Also preferably, the gas conditioning device may further include a controller and a sensor, the sensor is disposed behind the dehumidifying pump and is configured to acquire the humidity of the dehumidified and dried gas, and the controller controls the dehumidifying pump according to the humidity of the dehumidified and dried gas.
According to a preferred embodiment of the present invention, the gas conditioning device may include a heat exchanger that heats the dried gas into hot air, wherein the heat exchange medium discharged from the air cooler side of the heat pump flows into the heat exchanger, flows through the heat exchanger, and flows back to the air cooler of the heat pump. In this way, the heat extracted from the process water by the heat pump can be fully utilized.
According to a preferred embodiment of the invention, the heat pump may be a carbon dioxide heat pump. Compared with other types of heat pumps, the carbon dioxide heat pump has the advantages of high efficiency, high water outlet temperature, good low-temperature performance, environmental protection and the like. The coefficient of performance COP of the carbon dioxide heat pump can reach 8, namely the heat provided by the heat pump is 8 times of the heat generated by electric heating under the same power. If the temperature of the process water sent into the carbon dioxide heat pump is about 10-30 ℃, the outlet water temperature of the carbon dioxide heat pump at the air cooler side can reach 70-90 ℃. Moreover, because the heat pump uses the carbon dioxide heat pump as a medium, the water quality and the water quantity of the process water cannot be influenced, and the normal operation of a sewage plant cannot be influenced.
According to a preferred embodiment of the invention, the process water may be effluent, influent or intermediate process water of a sewage treatment system.
According to another aspect of the present invention, there is further provided a sludge drying method for drying sludge by using the sludge drying apparatus according to any one of the above preferred embodiments, the method comprising the steps of:
feeding the process water into a heat pump;
feeding the sludge into a drying device;
saturated evaporation moisture generated in the sludge drying process enters a gas regulating device from the drying device, the saturated evaporation moisture is subjected to dehumidification and drying by utilizing process water discharged from the evaporator side of the heat pump in the gas regulating device, the dehumidified and dried gas is heated into hot air by utilizing a heat exchange medium on the air cooler side of the heat pump, and then the hot air is sent into the drying device to dry the sludge.
According to a preferred embodiment of the sludge drying method, the gas conditioning device dehumidifies and dries the saturated evaporation moisture using the process water discharged from the evaporator side of the heat pump. Preferably, the gas conditioning device may include a condenser through which the saturated evaporation moisture is dehumidified and dried, and the process water discharged from the evaporator side of the heat pump flows into the condenser, passes through the condenser, and is discharged.
According to another preferred embodiment of the sludge drying method, the gas conditioning device may include a dehumidifying pump, by which the saturated evaporation moisture is dehumidified and dried.
The sludge drying method adopts a closed sludge drying device, and in the sludge drying device, the gas regulating device is connected with the drying device to form a closed system, so that closed infinite circulation of process condensed gas is realized, no odor is leaked to the external environment, and meanwhile, heat energy is recycled to evaporate sludge water in multiple effects; moreover, the gas conditioning device heats the gas into hot air by utilizing the heat energy absorbed by the heat pump from the sewage, thereby realizing low-consumption and environment-friendly sludge drying.
By the sludge drying method, infinite circulation of process condensed gas, cyclic utilization of heat energy and multiple-effect evaporation of sludge moisture are realized; the drying process is free of odor overflow, low-temperature drying is free of dust, sludge granulation and material returning are not needed, secondary cost is not increased, an expensive deodorization system and a dust removal system are not needed, the drying process can be directly installed in a plant area of a sewage treatment system, sludge is treated in a centralized manner, and condensed water can be directly discharged without secondary treatment.
Drawings
Hereinafter, a sludge drying apparatus and a sludge drying method according to preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 illustrates a sludge drying apparatus according to a preferred embodiment of the present invention;
FIG. 2 illustrates a sludge drying apparatus according to another preferred embodiment of the present invention;
FIG. 3 illustrates a sludge drying apparatus according to another preferred embodiment of the present invention;
fig. 4 shows a sludge drying apparatus according to still another preferred embodiment of the present invention.
Detailed Description
Fig. 1 shows a preferred embodiment of a sludge drying apparatus 1 according to the present invention. The sludge drying equipment 1 comprises a heat pump 2, a gas regulating device 3 and a drying device 4.
In the preferred embodiment shown in fig. 1, the heat pump 2 is a carbon dioxide heat pump, and carbon dioxide circulates in the heat pump 2 as a refrigerant. The operation of the heat pump is exemplarily described as follows. The carbon dioxide heat pump 2 includes an evaporator 21, a compressor 22, an air cooler 23, and a pressure reducing valve 24. Process water at about 10-30 c is fed to the evaporator 21 of the heat pump 2. In the evaporator 21, the low-temperature low-pressure two-phase carbon dioxide working medium absorbs the heat in the process water to become a low-temperature low-pressure gas-phase carbon dioxide working medium, and simultaneously the temperature of the process water in the evaporator 21 is reduced to 5-10 ℃ for discharge. The low-temperature low-pressure gas-phase carbon dioxide working medium is compressed by the compressor 22 to become high-temperature high-pressure gas, the high-temperature high-pressure gas enters the gas cooler 23 to exchange heat with a heat exchange medium, such as soft water, in the gas cooler 23, the soft water absorbs heat of the carbon dioxide working medium, the temperature of the soft water can be increased from 30-50 ℃ to 70-90 ℃, and meanwhile, the high-temperature high-pressure carbon dioxide working medium is cooled. The cooled carbon dioxide working medium is decompressed into a low-temperature low-pressure two-phase carbon dioxide working medium after passing through the pressure reducing valve 24, and the two-phase carbon dioxide working medium continuously enters the evaporator 21 to exchange heat with process water for the next cycle.
The drying device 4 comprises a drying chamber 41, an air inlet 42, an air outlet 43 on the opposite side of the air inlet 42, a sludge inlet 44 and a sludge outlet 45.
The gas outlet 35 of the gas adjusting device 3 is communicated with the air inlet 42 of the drying device, and the air outlet 43 of the drying device 4 is communicated with the air inlet 36 of the gas adjusting device, therefore, the gas adjusting device 3 is connected to the drying device 4 to form a closed system, saturated evaporation moisture generated in the sludge drying process enters the gas adjusting device 3 from the drying device 4, and the gas adjusting device 3 is dehumidified, dried and heated and sent back to the drying device 4 again to dry sludge.
The gas conditioning device 3 may include a plurality of condensers 31 connected in series, and the number of condensers may be calculated according to the requirements of various technical parameters such as sludge and water temperature. The process water of about 10-30 c is cooled to about 5-10 c after heat exchange in the evaporator 21 of the heat pump 2, and the cooled process water is fed into the plurality of condensers 31 for dehumidifying and drying the saturated evaporated moisture.
The gas conditioning device 3 further comprises a humidity sensor 34 and a PLC controller 33. The humidity sensor 34 is disposed at a corresponding position after the last stage condenser. The PLC controller 33 controls the opening and closing of the valve 37 of each condenser 31 according to the signal of the humidity sensor 34. If the humidity sensor 34 indicates that the humidity of the gas exceeds the standard, the PLC controller 33 will automatically open one or more or all of the condenser valves, and the number of open valves may be changed according to the humidity of the gas.
The gas conditioning device 3 includes a heat exchanger 32 disposed after the condenser 31, and is configured to heat the dehumidified and dried cold air into hot air. Soft water of about 70 to 90 ℃ discharged from the side of the air cooler 23 of the heat pump 2 enters the heat exchanger 32 of the gas conditioning device 3, exchanges heat with cold air flowing through the heat exchanger 32 at the heat exchanger 32, and then flows back to the air cooler 23 of the heat pump 2. Here, the cold air is heated to become hot air.
The operation of the sewage dewatering apparatus shown in fig. 1 is described as follows:
in the sludge drying process, the process water of the sewage plant is sent into the heat pump 2, and the sludge with the water content of 80-85 percent is sent into the top of the drying device 4.
The gas conditioning device 3 heats the gas located in the gas conditioning device 3 into hot air using latent heat extracted from the process water by the heat pump 2.
The hot air enters the bottom of the drying device 4, takes away the moisture in the sludge, changes the moisture into saturated evaporation moisture, and is discharged from the top of the drying device 4, the saturated evaporation moisture enters the gas regulating system 3, the moisture content of the sludge with the moisture content of 80-85% is reduced to below 30% after the sludge is dried by the hot air, and the condensate water generated by the dried sludge is discharged from the bottom of the drying device 4.
The plurality of condensers 31 of the gas conditioning device 3 dehumidifies and dries the saturated evaporated moisture entering the gas conditioning device 3 in multiple stages, and the PLC controller 34 controls the opening and closing of the valve 37 of each condenser 31 according to the signal of the humidity sensor 33 to provide a sufficiently dried gas. The dehumidified and dried gas continuously passes through the heat exchanger 32 of the gas regulating device 3, is converted into hot air at 55-70 ℃ after heat exchange, and the hot air enters the drying device 4 through the closed pipeline of the gas regulating device 3 to dry the sludge.
In the process, the condensed water generated in the drying device 4 and the condensed water generated in the drying process of the saturated evaporation moisture can be uniformly discharged into the water inlet 6 of the sewage treatment plant or directly discharged. The process water after heat exchange of the heat pump 2 is sent back to the process water taking point 5.
Fig. 2 shows a sludge drying apparatus according to another preferred embodiment of the present invention. The difference from the sludge drying apparatus 1 shown in fig. 1 is that the gas conditioning device 3 'has a dehumidifying pump 38' in addition to the condenser. For the sake of clarity, the same reference numerals have been omitted here for the components as in fig. 1.
The dehumidifying pump 38 ' is disposed before the plurality of condensers 31 ' and is arranged in series with the plurality of condensers 31 '. The sensor 34 ' is disposed behind the dehumidifying system composed of the dehumidifying pump 38 ' and the plurality of condensers 31 ' and is used to acquire the humidity of the dehumidified and dried gas. The PLC controller 33 ' controls to open the valves of one or more condensers of the plurality of condensers and/or controls to open the dehumidifying pump according to the humidity of the gas dehumidified and dried by the dehumidifying pump 38 ' and the plurality of condensers 31 '.
Fig. 3 shows a sludge drying apparatus according to another preferred embodiment of the present invention. The difference from the sludge drying installation 1 shown in fig. 1 is that the gas conditioning device 3 "has a dehumidifying pump 38" in addition to the condenser. For the sake of clarity, the same reference numerals have been omitted here for the components as in fig. 1.
In the embodiment shown in fig. 3, the dehumidifying pump 38 "is arranged in parallel with the plurality of condensers 31", and a part of the saturated evaporated moisture coming out of the drying device enters the dehumidifying pump 38 ", and another part of the saturated evaporated moisture enters the plurality of condensers 31". The sensor 34 "is disposed behind the dehumidifying system composed of the dehumidifying pump 38" and the plurality of condensers 31 "and is used to acquire the humidity of the dehumidified and dried gas. The PLC 33 'controls to open the valve of one or more condensers in the plurality of condensers and/or controls to open the dehumidifying pump 38' according to the humidity of the gas dehumidified and dried by the dehumidifying pump and the plurality of condensers.
Fig. 4 shows a sludge drying apparatus 101 according to still another preferred embodiment of the present invention. The sludge drying device 101 comprises a heat pump 102, a gas regulating device 103 and a drying device 104.
The gas outlet 135 of the gas adjusting device 103 is communicated with the gas inlet 142 of the drying device 104, and the gas outlet 143 of the drying device 104 is communicated with the gas inlet 136 of the gas adjusting device, so that the gas adjusting device 103 and the drying device 104 form a closed system, saturated evaporation moisture generated in the sludge drying process enters the gas adjusting device 103 from the drying device 104, and the gas adjusting device 103 is dehumidified, dried and heated and then sent back to the drying device 104 again to dry sludge.
Unlike the embodiment shown in fig. 1-3, the gas conditioning device no longer utilizes the outlet water on the evaporator side of the heat pump. The gas conditioning device 103 includes a dehumidifying pump 138, and only the dehumidifying pump 138 is used for dehumidifying and drying the saturated evaporation moisture generated in the sludge drying process. A humidity sensor 134 is provided after the dehumidifying pump 138, and the PLC controller 133 controls the dehumidifying pump 138 according to a signal of the humidity sensor 134.
The operation of the sewage dewatering apparatus shown in fig. 4 is described as follows:
feeding process water into the heat pump 102;
feeding the sludge into a drying device 104;
saturated evaporation moisture generated in the sludge drying process enters the gas regulating device 103 from the drying device 104, the saturated evaporation moisture is subjected to dehumidification and drying in the gas regulating device 103 through a dehumidification pump 138 of the gas regulating device 103, then the dehumidified and dried gas is heated to be hot air at a heat exchanger 132 of the gas regulating device 103, and finally the hot air is sent to the drying device 104 to dry the sludge.
The embodiments according to the present invention described above are merely exemplary, and the present invention is not limited thereto. It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention, and it is intended that the present invention encompass such changes and modifications as fall within the scope of the invention.

Claims (16)

1. A sludge drying apparatus comprising:
the heat pump comprises an evaporator, a compressor, an air cooler and a pressure reducing valve, and is provided with a refrigerant circulating among the evaporator, the compressor, the air cooler and the pressure reducing valve of the heat pump, wherein process water at 10-30 ℃ from a sewage treatment system is sent into the evaporator, and the refrigerant absorbs heat in the process water at the evaporator and exchanges heat with a heat exchange medium in the air cooler at the air cooler so that the heat exchange medium can be heated to 70-90 ℃;
the drying device is used for conveying the sludge into the drying device for drying;
the gas adjusting device is connected to the drying device to form a closed system, and gas for drying the sludge flows in the closed system in a circulating manner, wherein the gas adjusting device is used for adjusting the temperature and humidity of the gas;
saturated evaporation moisture generated in the sludge drying process enters the gas regulating device from the drying device, the gas regulating device dehumidifies and dries the saturated evaporation moisture to obtain dry gas, the dry gas is heated into hot air of 55-70 ℃ by utilizing a heat exchange medium in a gas cooler of the heat pump, the temperature of the heat exchange medium is raised to 70-90 ℃, and then the hot air is sent into the drying device to dry sludge;
the heat exchange medium in the air cooler of the heat pump, which is heated to 70-90 ℃, is returned to the air cooler of the heat pump after heating the drying gas.
2. The sludge drying apparatus of claim 1, wherein the gas conditioning device dehumidifies and dries the saturated evaporated moisture using heat-exchanged process water discharged from an evaporator side of the heat pump.
3. The sludge drying apparatus as claimed in claim 2, wherein the gas conditioning device comprises a condenser, the saturated evaporation moisture is dehumidified and dried by the condenser, and the process water discharged from the evaporator side of the heat pump flows into the condenser, passes through the condenser and is discharged.
4. The sludge drying apparatus as claimed in claim 3, wherein the gas conditioning device comprises a plurality of condensers, the saturated evaporation moisture is subjected to multi-stage dehumidification and drying by the plurality of condensers, and the process water discharged from the evaporator side of the heat pump is respectively fed into the plurality of condensers, flows through the corresponding condensers, and is discharged.
5. The sludge drying apparatus as claimed in claim 4, wherein the gas adjusting device comprises a controller and a sensor, the sensor is disposed after the last stage of the plurality of condensers for obtaining the humidity of the dehumidified and dried gas, and the controller controls to open the valves of one or more of the plurality of condensers according to the humidity of the dehumidified and dried gas.
6. The sludge drying apparatus of claim 3, wherein the gas conditioning device further comprises a dehumidification pump, and the dehumidification pump is arranged in series or in parallel with the condenser.
7. The sludge drying apparatus according to claim 6, wherein the gas conditioning device further comprises a controller and a sensor, the sensor is disposed behind a dehumidification system formed by the dehumidification pump and the condenser and is used for acquiring humidity of the dehumidified and dried gas, and the controller controls the condenser and/or the dehumidification pump according to the humidity of the dehumidified and dried gas.
8. The sludge drying apparatus of claim 1, wherein the gas conditioning device comprises a dehumidifying pump, and the saturated evaporation moisture is dehumidified and dried by the dehumidifying pump.
9. The sludge drying apparatus as claimed in claim 8, wherein the gas conditioning device further comprises a controller and a sensor, the sensor is disposed behind the dehumidifying pump and is used for acquiring the humidity of the dehumidified and dried gas, and the controller controls the dehumidifying pump according to the humidity of the dehumidified and dried gas.
10. The sludge drying apparatus according to any one of claims 1 to 9, wherein the gas conditioning device comprises a heat exchanger, the dehumidified and dried gas is heated into hot air by the heat exchanger, and the heat exchange medium discharged from the gas cooler side of the heat pump flows into the heat exchanger, flows through the heat exchanger, and flows back to the gas cooler of the heat pump.
11. The sludge drying apparatus of any one of claims 1 to 9, wherein the heat pump is a carbon dioxide heat pump.
12. The sludge drying apparatus as claimed in any one of claims 1 to 9, wherein the process water is effluent water, influent water or water treated in an intermediate process of a sewage treatment plant.
13. A sludge drying method for drying sludge by the sludge drying apparatus as claimed in any one of the claims 1 to 12, the sludge drying method comprising the steps of:
sending process water from a sewage treatment system into a heat pump, wherein the heat pump comprises an evaporator, a compressor, an air cooler and a pressure reducing valve, the heat pump is provided with a refrigerant circulating among the evaporator, the compressor, the air cooler and the pressure reducing valve of the heat pump, the process water at 10-30 ℃ from the sewage treatment system is sent into the evaporator, the refrigerant absorbs heat in the process water at the evaporator and exchanges heat with a heat exchange medium in the air cooler at the air cooler, and the heat exchange medium can be heated to 70-90 ℃;
feeding the sludge into a drying device;
saturated evaporation moisture generated in the sludge drying process enters a gas regulating device from the drying device, the gas regulating device dehumidifies and dries the saturated evaporation moisture to obtain dry gas, the dehumidified and dried dry gas is heated into hot air at the temperature of 55-70 ℃ by using a heat exchange medium in a gas cooler of the heat pump, the temperature of the heat exchange medium is raised to 70-90 ℃, and then the hot air is sent into the drying device to dry the sludge;
wherein the heat exchange medium in the air cooler of the heat pump, which is heated to 70-90 ℃, heats the drying gas at the gas regulating device and then is sent back to the air cooler of the heat pump.
14. The sludge drying method of claim 13, wherein the gas conditioning device dehumidifies and dries the saturated evaporation moisture using process water discharged from an evaporator side of the heat pump.
15. The sludge drying method as claimed in claim 14, wherein the gas conditioning device comprises a condenser, the saturated evaporation moisture is dehumidified and dried by the condenser, and the process water discharged from the evaporator side of the heat pump flows into the condenser, passes through the condenser and is discharged.
16. The sludge drying method of claim 13, wherein the gas conditioning device comprises a dehumidification pump, and the saturated evaporation moisture is dehumidified and dried by the dehumidification pump.
CN201910091433.5A 2019-01-30 2019-01-30 Sludge drying equipment and sludge drying method Active CN109626791B (en)

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CN101239773B (en) * 2008-03-14 2010-06-09 清华大学 Heat pump and sludge drying integration method and system
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CN204356212U (en) * 2014-12-26 2015-05-27 杨志成 A kind of belt drying plant and sludge drying system
CN105060673A (en) * 2015-07-27 2015-11-18 广州市环境保护工程设计院有限公司 Sealed low temperature sludge desiccation system
CN108069576A (en) * 2016-11-10 2018-05-25 桑尼环保(江苏)有限公司 A kind of closed system of pump coupled heat absorbed type drying sludge
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