CN210001756U - sludge low-temperature drying device - Google Patents
sludge low-temperature drying device Download PDFInfo
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- CN210001756U CN210001756U CN201920810645.XU CN201920810645U CN210001756U CN 210001756 U CN210001756 U CN 210001756U CN 201920810645 U CN201920810645 U CN 201920810645U CN 210001756 U CN210001756 U CN 210001756U
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Abstract
The utility model relates to a sludge drying handles technical field, provides kinds of sludge low temperature mummification device, the utility model provides a device is including storing up mud case, level low temperature mummification system, second grade low temperature mummification system, PLC intelligence control system, level low temperature mummification system includes level low temperature mummification room, draught fan, level mummification filter, level dry vapour and liquid separator and heat pump, second grade low temperature mummification system includes second grade low temperature mummification room, vacuum pump, second grade mummification filter, second grade dry vapour and liquid separator and heat transfer exocoele, level low temperature mummification system and second grade low temperature mummification system in the device have adopted heat pump energy cyclic utilization and vacuum evaporation's technique respectively, can effectively improve sludge drying efficiency under the lower temperature, reduce the power consumption, and the process does not produce the foul smell, has safety and stability, clean environmental protection.
Description
Technical Field
The utility model relates to a sludge drying treatment technical field, in particular to kinds of sludge low temperature drying device.
Background
Along with the development of economy and the improvement of the living standard of people, the urbanization process is accelerated continuously, the production of industrial sewage and domestic sewage is increased, and the sludge yield is increased day by day, therefore, the state supports the sludge reduction and incineration technology greatly, wherein the sludge drying technology has strong stability, and is an important method for reducing sludge.
At present, domestic and foreign sludge drying process equipment mainly adopts a heat drying technology, and specifically comprises rotary kiln hot air drying, belt type hot air drying, fluidized bed hot air drying, paddle type drying and the like, but the traditional processes have large heat energy consumption and poorer technical economy. In addition, the working temperature of the traditional heat drying technology generally needs to be more than 110 ℃, and a great amount of dust and odor generated in the drying process need to be treated by additionally arranging facilities.
In recent years, a low-temperature sludge drying technology utilizing the working principle of a dehumidifying heat pump is gradually favored, but the temperature is reduced in the drying process, and the evaporation amount of water in the sludge is limited, under the constant temperature of , when saturated water vapor in a drying chamber reaches a corresponding limit value, the drying time is long enough to achieve the ideal drying effect of the sludge, so that the power consumption of electric equipment is indirectly increased, and the energy-saving effect is not obvious.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model aims to provide an high-efficient energy-conserving mud low temperature mummification device can solve the exhaust emission problem of mud mummification in-process, improves mud mummification efficiency simultaneously, reduces mud mummification energy consumption, has advantages such as safety, environmental protection, high-efficient, stable and economy.
In order to realize the purpose of the utility model, the utility model provides a following technical scheme:
the utility model provides sludge low-temperature drying devices, which comprise a sludge storage box, a level low-temperature drying system, a two-level low-temperature drying system and a PLC intelligent control system;
the -level low-temperature drying system comprises a -level low-temperature drying chamber, an induced draft fan, a -level drying filter, a -level drying gas-liquid separator and a heat pump, wherein the -level low-temperature drying chamber, the induced draft fan, the -level drying filter, the -level drying gas-liquid separator and the heat pump are sequentially connected through ventilation pipelines to form a loop;
the secondary low-temperature drying system comprises a secondary low-temperature drying chamber, a vacuum pump, a secondary drying filter, a secondary drying gas-liquid separator and a heat transfer outer cavity; the secondary low-temperature drying chamber, the vacuum pump, the secondary drying filter and the secondary dry gas-liquid separator are sequentially connected through a ventilation pipeline; the gas outlet of the secondary dry gas-liquid separator is connected with the inlet of the heat pump through a ventilation pipeline;
the heat transfer outer cavity is wrapped outside the secondary low-temperature drying chamber and is provided with an air inlet and an air outlet, and the air inlet and the air outlet of the heat transfer outer cavity are respectively connected with the outlet and the inlet of the heat pump through a ventilation pipeline to form a loop;
the sludge storage box is connected with the -grade low-temperature drying chamber through a -grade drying sludge inlet, a -grade drying electric valve is mounted on the -grade drying sludge inlet, the -grade low-temperature drying chamber is connected with the secondary low-temperature drying chamber through a secondary drying sludge inlet, and a secondary drying electric valve is mounted on the secondary drying sludge inlet;
the sludge low-temperature drying device is also provided with a feed inlet, and sludge enters the sludge storage box through the feed inlet;
and the PLC intelligent control system is used for controlling the operation of the sludge low-temperature drying device.
Preferably, levels of drying conveyor belts are arranged in the levels of low-temperature drying chambers, two levels of drying conveyor belts are arranged in the two levels of low-temperature drying chambers, the levels of drying conveyor belts and the two levels of drying conveyor belts independently comprise multiple layers of conveyor belts, and the conveying directions of the adjacent conveyor belts are opposite.
Preferably, the number of conveyor belts of the -level drying conveyor belt and the two-level drying conveyor belt is independently 4-5.
Preferably, the heat pump is connected with the -grade low-temperature drying chamber air inlet and the heat transfer outer cavity air inlet through an electric three-way valve, the output of hot dry air is adjusted through the electric three-way valve, when only the -grade low-temperature drying system is started, the electric three-way valve only outputs the hot dry air to the -grade low-temperature drying chamber, when only the secondary low-temperature drying system is started, the electric three-way valve only outputs the hot dry air to the heat transfer outer cavity, and when the -grade low-temperature drying system and the secondary low-temperature drying system are simultaneously started, the electric three-way valve simultaneously outputs the hot dry air to the -grade low-.
Preferably, the discharge side of the lowest conveyor belt of the -grade low-temperature drying chamber is provided with -grade drying adjusting baffle and -grade dried sludge outlet, wherein the -grade drying adjusting baffle is used for controlling the sludge outlet direction of the -grade low-temperature drying chamber sludge.
Preferably, the second-level low-temperature drying chamber is provided with a second-level drying adjusting baffle and a second-level dried sludge outlet at the discharge side of the conveyor belt at the bottom, wherein the second-level drying adjusting baffle is used for controlling the sludge outlet direction of the second-level low-temperature drying chamber sludge and controlling the switch of the second-level dried sludge outlet.
Preferably, the low-temperature sludge drying device is also provided with a main water outlet, and liquid outlets of the -stage dry gas-liquid separator and the secondary dry gas-liquid separator are connected with the main water outlet through pipelines.
Preferably, the filter material in the -grade drying filter and the two-grade drying filter is a filter cotton core or activated carbon.
(1) Has the advantages that: the device provided by the utility model is efficient and energy-saving, combines the dehumidification heat pump principle and the relationship between the temperature and the saturated vapor pressure and the vacuum degree, reduces the water content of the sludge from 60-85% to less than or equal to 10-30% in a short time, improves the sludge drying efficiency, reduces the service time of electric equipment and reduces the energy consumption;
(2) the utility model has the advantages that the practical range of the device is applicable to the drying of domestic sludge and various industrial sludge, the moisture content of the discharged sludge can be adjusted within 10-50% at will, and different requirements of users are met;
(3) the device provided by the utility model is safe, stable and environment-friendly in operation, the whole sludge drying process is carried out in a closed space, and only the dehumidifying heat pump is used as heat supply equipment, the operation temperature is low, no dust danger exists, no explosion hidden danger exists, no odor is generated, and no deodorizing device is required to be installed;
(4) the device provided by the utility model adopts PLC intelligent control, can automatically control the sludge drying system according to different sludge drying degrees, has less operation and maintenance workload, and saves a large amount of labor cost;
(5) the device provided by the utility model is design of integration, convenient transportation and installation.
Drawings
FIG. 1 is a schematic view of the internal structure of the low temperature drying apparatus of the present invention;
FIG. 2 is an external view of the low temperature drying apparatus of the present invention;
in the attached drawings 1-2, a feed inlet 1, a sludge storage box 2, a drying sludge inlet 3- , a drying electric valve 4- , a drying adjusting baffle 5- 0, a low-temperature drying chamber 6- 1, a drying conveyor belt 7-7, a drying conveyor belt 8, an induced draft fan 9- , a drying filter 10- , a drying gas-liquid separator 11-a heat pump 11-a drying adjusting baffle 12- , a drying sludge inlet 13-a drying electric valve -a drying chamber 15-a drying chamber 16-a vacuum pump 17-a drying filter 18-a drying gas-liquid separator 18-a drying outer cavity 19-a heat transfer outer cavity 20-a drying adjusting baffle 20-a PLC intelligent control system 21-a drying sludge outlet 22- , a drying sludge outlet 23-a drying sludge outlet 24-a total water outlet 25- , a drying low-temperature drying chamber air outlet 26- , a drying chamber air inlet 27-an electric outer cavity 28-a three-way valve 28-an air inlet 28-an air outlet 29-a heat transfer air outlet.
FIG. 3 is a schematic view of the low-temperature sludge drying process of the present invention.
Detailed Description
The utility model provides a sludge low-temperature drying device, which is structurally shown in figures 1-2, and comprises a feed inlet 1-a feed inlet 2-a sludge storage box 3- -level drying sludge inlet, a 4- 0-level drying electric valve , a 5- 1-level low-temperature drying chamber, a 6- 2-level drying conveyor belt, a 7-level drying conveyor belt, an 8-induced draft fan, a 9- -level drying filter, a 10- -level drying gas-liquid separator, a 11-heat pump, a 12- -level drying adjusting baffle, a 13-level secondary sludge inlet, a 14-level drying electric valve , a 15-level low-temperature drying chamber, a 16-vacuum pump, a 17-level secondary drying filter, a 18-level drying gas-liquid separator, a 19-level heat transfer outer chamber drying chamber, a 20-level secondary drying adjusting baffle, a 21-PLC intelligent control system, a 22- -level drying sludge outlet, a 23-level secondary sludge outlet, a 24-total water outlet, a 25- -level low-temperature drying outer chamber, a 26- -level air inlet, a 28-three-way valve, and a heat transfer three-.
The device provided by the utility model is including storing up mud case, level low temperature mummification system, second grade low temperature mummification system and PLC intelligence control system.
The device provided by the utility model comprises a mud storage box. The utility model discloses in, it is preferred to be located to store up the mud case the top of mud low temperature mummification device, for leaking hopper-shaped, the device is provided with the feed inlet, and mud passes through the feed inlet and gets into store up in the mud case.
The utility model provides a device includes level low temperature mummification system the utility model discloses in, level low temperature mummification system includes 0 level low temperature mummification room, draught fan, 1 level mummification filter, 2 level mummification vapour and liquid separator and heat pump, 3 level low temperature mummification room, draught fan, level mummification filter, level mummification liquid separator and heat pump pass through air pipe and connect in order, form the return circuit, level low temperature mummification room is provided with air outlet and air intake, the air outlet of draught fan and level low temperature mummification room is connected, the air intake connection of heat pump and level low temperature mummification room the utility model discloses in, the air outlet is preferred to be set up level low temperature mummification room top, the air intake is preferred to be set up level low temperature mummification room bottom to make hot dry air form the form of conveying from bottom to top in level low temperature mummification room, increase the utilization.
The utility model discloses in, level low temperature is provided with level mummification conveyer belt in the mummification room, level mummification conveyer belt is preferred to include the multilayer conveyer belt, the number of piles of conveyer belt is preferred 4 ~ 5 layers, the direction of transfer of adjacent conveyer belt is opposite, and parallel arrangement, the discharge end of last conveyer belt all is located the feed end top of the adjacent conveyer belt in below, the conveyer belt of below carries mud to level mummification mud play mud mouth or second level low temperature mummification room, when operation, mud is the transport mode of end to end on the conveyer belt, for example, mud is at first from the left side to the right side conveying on level conveyer belt, falls the feed end of second floor conveyer belt from the discharge end of level conveyer belt, then from the right side to the left side conveying on second floor conveyer belt, falls the discharge end of second floor conveyer belt to the feed end of third layer conveyer belt, then from the left side to the right side conveying again.
The utility model discloses in, level low temperature mummification room below conveyer belt discharge side is preferred still to be equipped with level mummification adjusting baffle and 0 level mummification mud play mud mouth, wherein 1 level mummification adjusting baffle is used for controlling the play mud direction of 2 level low temperature mummification room mud, when level mummification adjusting baffle and second grade mummification advance mud mouth and link to each other, level low temperature mummification room mud is from last layer conveyer belt conveying to the second grade mummification enter mud mouth get into the second grade low temperature mummification indoor, when level mummification adjusting baffle and level mummification mud play mud mouth link to each other, level low temperature mummification room mud is from last layer conveyer belt conveying to level mummification mud play mud mouth eduction outside the device.
The utility model discloses in, store up the mud case with level low temperature mummification room is connected through level mummification mud inlet, level mummification is installed level mummification motorised valve on the mud inlet, level mummification motorised valve can control opening and closing of level mummification mud inlet.
The device provided by the utility model comprises a second-stage low-temperature drying system. The utility model discloses a second-stage low-temperature drying system comprises a second-stage low-temperature drying chamber, a vacuum pump, a second-stage drying filter, a second-stage drying gas-liquid separator and a heat transfer outer cavity; the secondary low-temperature drying chamber, the vacuum pump, the secondary drying filter and the secondary dry gas-liquid separator are sequentially connected through a ventilation pipeline; the gas outlet of the secondary dry gas-liquid separator is connected with the inlet of the heat pump through a ventilation pipeline; the heat transfer outer cavity is wrapped outside the secondary low-temperature drying chamber and is provided with an air inlet and an air outlet, and the air inlet and the air outlet of the heat transfer outer cavity are respectively connected with the outlet and the inlet of the heat pump through a ventilation pipeline to form a loop.
The utility model discloses in, the indoor preferred second grade mummification conveyer belt that is provided with of second grade low temperature mummification, the form and the number of piles of second grade mummification conveyer belt preferred with level mummification conveyer belt is the same, no longer gives unnecessary details here.
The utility model discloses in, level low temperature mummification room passes through the second grade mummification with second grade low temperature mummification room and advances the mud mouth to be connected, install second grade mummification motorised valve on the second grade mummification mud mouth, opening and closing that second grade mummification motorised valve can the control second grade mummification mud mouth.
In the utility model, the lowest conveyor belt discharging side of the secondary low-temperature drying chamber is preferably provided with a secondary drying adjusting baffle and a secondary drying sludge outlet, wherein the secondary drying adjusting baffle is used for controlling the sludge outlet direction of the secondary low-temperature drying chamber sludge and controlling the switch of the secondary drying sludge outlet; when second grade mummification adjusting stop links to each other with terminal discharge gate of second grade drive belt and second grade mummification mud play mud mouth, outside second grade mummification mud play mud mouth eduction gear, when needs need the evacuation with second grade low temperature mummification room, second grade mummification adjusting stop seals second grade mummification mud play mud mouth, and other equipment of cooperation make second grade low temperature mummification room form the vacuum state.
The utility model discloses in, heat pump and level low temperature drying room air intake, the outer chamber air intake of heat transfer is preferred to be connected through electronic three-way valve, adjust the output of hot dry wind through electronic three-way valve, when only starting level low temperature drying system, electronic three-way valve only exports hot dry wind to level low temperature drying room, when only starting second level low temperature drying system, electronic three-way valve only exports hot dry wind to the outer chamber of heat transfer, when level low temperature drying system, second level low temperature drying system starts simultaneously, electronic three-way valve exports hot dry wind to 466 level low temperature drying room, heat transfer outer chamber simultaneously, the utility model discloses in, level low temperature drying system and second level low temperature drying system are provided the heat by the heat pump, when using, the heat pump passes through air pipe for level low temperature drying room and heat transfer outer chamber transport hot dry wind respectively, wherein strand hot dry wind gets into from level low temperature drying room bottom, accomplish the heat exchange and the heat pump and the moisture that produces, the low temperature humid air that produces is taken out through the draught fan, get rid of impurity after level low temperature drying room gets into the air drying room, the dry air that no harm is the dry air is gone into through the heat pump, and the dry air is carried through the heat transfer no danger is reduced, and the dry air is carried through the heat pump, and the heat transfer no danger is realized that the dry air is not to the heat transfer is not to the dry air drying room, and the dry air is carried through the heat pump, and the dry air is carried through the heat transfer no low temperature drying room, and the dry air is carried through the heat pump, and the heat transfer no low temperature drying room, and is carried through the heat transfer no more, and the dry air.
Furthermore, the utility model discloses an still install the vacuum pump in the second grade low temperature mummification system, when using, the low temperature humid air that the vacuum pump was taken out in the second grade low temperature mummification room, after low temperature humid air gets rid of impurity through second grade mummification filter, gets into second grade dry vapour and liquid separator, and the comdenstion water of separation passes through the pipeline and discharges, and low temperature air sends into level low temperature mummification room and the exocoel that conducts heat after the heat pump heating drying, so constantly circulates the utility model discloses utilize the evaporation rate that vacuum evaporation technique improved moisture in second grade low temperature mummification system, advance step improvement mummification efficiency.
The utility model discloses in, the preferred total outlet that still is provided with of mud low temperature mummification device, level dry vapour and liquid separator and second grade dry vapour and liquid separator's liquid outlet pass through the pipeline with the total outlet links to each other the utility model discloses in, filter material in level mummification filter and the second grade mummification filter is preferably filtering cotton core or active carbon.
The device provided by the utility model comprises a PLC intelligence control system, PLC intelligence control system is used for controlling the operation of mud low temperature mummification device, including the operation of controlling all equipment, closing of valve and baffle etc. the utility model discloses in, level low temperature mummification system and second grade low temperature mummification system in the device can the independent start, also can start simultaneously, select according to the condition during concrete application can.
The utility model discloses to the concrete kind of each device, valve and baffle of above-mentioned scheme do not have special requirement, use the device, valve and the baffle that the skilled person in the art is familiar with, can realize corresponding function can.
When the device of the utility model is used for low-temperature sludge drying, the drying method preferably comprises the following steps:
(1) wet sludge enters a sludge storage box through a feed inlet, and the moisture content of the wet sludge is 60-85%;
(2) the PLC intelligent control system controls equipment and a switch valve in the sludge low-temperature drying system according to the target moisture content of the sludge drying, and specifically comprises the following steps:
when the target water content of the sludge reaches 30-50%, only starting an -grade low-temperature drying system, and continuously discharging the wet sludge from a -grade drying sludge outlet after the wet sludge is dried in a -grade low-temperature drying chamber;
when the target water content of the sludge reaches 10-30%, an -grade low-temperature drying system and a two-grade low-temperature drying system are alternately started, after -grade conveyor belts are fully paved with wet sludge, a 0-grade drying electric valve is closed, a 1-grade low-temperature drying system is started, the wet sludge is dried in a 2-grade low-temperature drying chamber until the water content is 30-50%, -grade dried sludge is completely conveyed to the two-grade low-temperature drying chamber, then the two-grade drying electric valve is closed, the two-grade low-temperature drying system is started, meanwhile, a -grade drying electric valve is re-opened, after a -grade drying conveyor belts are uniformly paved with wet sludge of a next batch, the -grade low-temperature drying system is restarted, the operation is continuously and alternately performed in a.
The utility model discloses in, wet mud at first enters into the mud storage box through the feed inlet, keeps in the mud storage box, waits for the mummification. The utility model discloses in, the moisture content of wet mud is 60 ~ 85%.
After the wet sludge enters the sludge storage box, the PLC intelligent control system controls equipment and a switch valve in the sludge low-temperature drying system according to the target moisture content of the sludge.
The utility model discloses in, when the requirement of mud target moisture content reached 30 ~ 50%, only start level low temperature mummification system, wet mud is in level low temperature mummification room after the mummification from level mummification mud outlet continuous mud, specific operation method is that at first open level mummification motorised valve , close second level mummification motorised valve , start 632 level mummification conveyer belt and make the wet mud in the mud storage box evenly drop on it, hot dry air that the heat pump produced gets into from level low temperature mummification room bottom, take away the moisture of wet mud on the conveyer belt, the low temperature humid air that produces is taken out through the draught fan, after level mummification filter removes impurity, get into level dry vapour and liquid separator, the comdenstion water that produces is discharged through the pipeline, low temperature dry air passes through the heat pump and turns into hot dry air and send into level low temperature mummification room, the circulation so constantly, control level adjusting baffle of mummification unloads the dry mud that the last conveyer belt dropped to .
The utility model discloses a high-temperature drying system, a tail gas inlet, a tail gas outlet, a tail gas inlet, a tail gas outlet, a tail gas inlet.
The utility model discloses in, the dry air temperature of heat pump output is preferred 40 ~ 80 ℃ among the level low temperature mummification system, more preferred 50 ~ 70 ℃, the heat supply temperature of heat transfer exocoel is preferred 40 ~ 80 ℃ among the second grade low temperature mummification system, more preferred 50 ~ 70 ℃, the indoor vacuum of second grade low temperature mummification is preferred 0.08 ~ 0.0109Mpa, more preferred 0.09 Mpa.
The utility model provides a process flow schematic diagram that the device carries out mud low temperature mummification is shown in figure 3, the utility model discloses a theory of operation is because saturated steam pressure has corresponding limit value in certain temperature, and the temperature is lower, and saturated steam pressure is lower, and the evaporation of moisture in the mud is slower, if need advance step reduction with moisture in the mud, then need longer time, therefore the utility model discloses a level low temperature mummification system utilizes dehumidification heat pump principle earlier, dries the wet mud that moisture content is 60 ~ 85% to moisture content in low temperature condition, short time earlier to be 30 ~ 50%, utilizes the relation of evaporation capacity and saturated steam pressure again, starts second grade low temperature mummification system, makes second grade low temperature mummification room keep a certain temperature and vacuum, causes the steam pressure can not reach the saturation value, and moisture in the mud constantly gasifies into water vapour fast, so only need can increase the evaporation capacity of moisture in the mud under the low temperature condition, and the mud moisture content reduces rapidly, will level low temperature mummification system and second grade low temperature mummification system combine, then can make wet mud reduce to moisture content to reduce to below 30.
The embodiments of the present invention will be described in detail with reference to the following examples, but they should not be construed as limiting the scope of the present invention.
Example 1
The low-temperature drying device shown in fig. 1-2 is adopted for drying sludge, and comprises the following steps:
(1) wet sludge with the water content of 60-85% enters a sludge storage box 2 through a feed port 1 for temporary storage, and drying is waited;
(2) the PLC intelligent control system 21 controls equipment and a switch valve in the sludge low-temperature drying device according to the target water content of the sludge drying, and the operation is as follows:
the -grade low-temperature drying system is started, namely, firstly, an -grade drying electric valve is opened, a 14 of a second-grade drying electric valve is closed, an -grade drying conveyor belt 6 is started, wet sludge in a sludge storage box 2 uniformly falls on the drying electric valve, hot dry air generated by a heat pump 11 enters from the bottom of a 1-grade low-temperature drying chamber 5, the temperature in the 2-grade low-temperature drying chamber 5 is kept at about 55 ℃, moisture of the wet sludge on the 3-grade drying conveyor belt 6 is taken away, the generated low-temperature wet air is pumped out by an induced draft fan 8, impurities are removed by a -grade drying filter 9 using a filter cotton core as a filter material, the low-temperature wet air enters a -grade dry gas-liquid separator 10, condensed water is discharged through a pipeline, the low-temperature dry air is converted into the hot dry air to be sent into a -grade low-temperature drying chamber 5, a -grade adjusting baffle 12 is controlled to discharge the dry sludge from an -grade drying conveyor belt 6 to a -grade sludge outlet 22, the operation is continuously circulated in the above mode, and the hot dry air is continuously discharged.
The moisture content of -grade dried sludge obtained by the treatment of the steps is about 40%, the reduction is more than 50%, the energy is saved by more than 30% compared with that of the traditional low-temperature drying equipment, and the time from the wet sludge entering a -grade low-temperature drying chamber to the wet sludge being discharged from a -grade dried sludge outlet is 90 min.
Example 2
The low-temperature drying device shown in fig. 1-2 is adopted for drying sludge, and comprises the following steps:
(1) wet sludge with the water content of 60-85% enters a sludge storage box 2 through a feed port 1 for temporary storage and waiting for drying;
(2) the PLC intelligent control system 21 controls equipment and a switch valve in the sludge low-temperature drying device according to the target water content of the sludge drying, and the operation is as follows:
(2-1) opening an -level drying electric valve , starting a -level drying conveyor belt 6, enabling wet sludge to fall and uniformly cover a -level drying conveyor belt 6, closing a -level drying electric valve , stopping sludge feeding, starting an induced draft fan 8 and a heat pump 11, enabling hot dry air to enter from the bottom of a -level low-temperature drying chamber 5, keeping the temperature in the -level low-temperature drying chamber 5 at about 55 ℃, taking away moisture of the wet sludge on the conveyor belt, pumping out the generated low-temperature wet air through the induced draft fan 8, removing impurities through a -level drying air filter 9 using a filter cotton core as a filter material, then enabling the low-temperature dry air to enter a -level drying liquid separator 10, discharging condensed water through a drain pipe, and converting the low-temperature dry air into the hot dry air through the heat pump 11 and then feeding;
(2-2) after wet sludge is dried by a -grade low-temperature drying system until the moisture content is 40%, controlling a -grade drying adjusting baffle 12 to close a -grade dried sludge outlet 22, enabling -grade dried sludge to fall into a secondary drying sludge inlet 13, simultaneously opening a secondary drying electric valve 14, simultaneously starting a -grade drying conveyor belt 6 and a secondary drying conveyor belt 7, and stopping the drying conveyor belt 7 until -grade dried sludge is uniformly paved on the secondary drying conveyor belt 7, sealing the secondary drying sludge outlet 23 by a secondary drying adjusting baffle 20, enabling the secondary low-temperature drying chamber 15 to be in a closed state, starting a vacuum pump 16, continuously operating a heat pump 11, enabling dry hot air to enter an outer cavity for heat transfer, keeping the temperature in the secondary low-temperature drying chamber 15 at 40 ℃, enabling the vacuum degree to be higher than 0.093MPa, continuously gasifying water in the sludge into steam and pumping out the steam by a vacuum pump 16, enabling the steam to enter a secondary drying filter 17 with a filter material, removing impurities, and then enter a secondary dry air 18, discharging condensate water through a drain pipe, converting the dry air into dry air, sending the hot air into , and drying the secondary drying sludge from the secondary drying chamber 20, and controlling the secondary drying sludge outlet 20 to fall from the secondary drying sludge outlet 16, and controlling the secondary drying sludge outlet to be dried sludge to fall from;
-stage low-temperature drying chamber 5 conveys 0-stage dried sludge of to a second-stage low-temperature drying chamber 15, a second-stage drying electric valve is closed, the second-stage low-temperature drying system is started, meanwhile, a -stage drying electric valve is opened again, after -stage wet sludge is uniformly paved on -stage low-temperature drying conveyor belt 6, a -stage low-temperature drying system is restarted, steps (2-1) - (2-2) are repeated, and the cycle is operated alternately, in the process, the conveying direction of hot dry air is controlled by an electric three-way valve 27, when only the -stage low-temperature drying system is started, the electric three-way valve 27 only outputs the hot dry air to the -stage low-temperature drying chamber 5, when only the second-stage low-temperature drying system is started, the electric three-way valve 27 only outputs the hot dry air to the heat transfer outer chamber 19, and when the -stage low-temperature drying system and the second-stage low-temperature drying system are started simultaneously.
The water content of the secondary dried sludge treated by the steps is about 10 percent, the reduction is more than 85 percent, the energy is saved by more than 60 percent compared with the traditional low-temperature drying equipment, and the total drying time of batches of wet sludge is 120 min.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (8)
- The sludge low-temperature drying device is characterized by comprising a sludge storage box, a level low-temperature drying system, a two-level low-temperature drying system and a PLC intelligent control system;the -level low-temperature drying system comprises a -level low-temperature drying chamber, an induced draft fan, a -level drying filter, a -level drying gas-liquid separator and a heat pump, wherein the -level low-temperature drying chamber, the induced draft fan, the -level drying filter, the -level drying gas-liquid separator and the heat pump are sequentially connected through ventilation pipelines to form a loop;the secondary low-temperature drying system comprises a secondary low-temperature drying chamber, a vacuum pump, a secondary drying filter, a secondary drying gas-liquid separator and a heat transfer outer cavity; the secondary low-temperature drying chamber, the vacuum pump, the secondary drying filter and the secondary dry gas-liquid separator are sequentially connected through a ventilation pipeline; the gas outlet of the secondary dry gas-liquid separator is connected with the inlet of the heat pump through a ventilation pipeline;the heat transfer outer cavity is wrapped outside the secondary low-temperature drying chamber and is provided with an air inlet and an air outlet, and the air inlet and the air outlet of the heat transfer outer cavity are respectively connected with the outlet and the inlet of the heat pump through a ventilation pipeline to form a loop;the sludge storage box is connected with the -grade low-temperature drying chamber through a -grade drying sludge inlet, a -grade drying electric valve is mounted on the -grade drying sludge inlet, the -grade low-temperature drying chamber is connected with the secondary low-temperature drying chamber through a secondary drying sludge inlet, and a secondary drying electric valve is mounted on the secondary drying sludge inlet;the sludge low-temperature drying device is also provided with a feed inlet, and sludge enters the sludge storage box through the feed inlet;and the PLC intelligent control system is used for controlling the operation of the sludge low-temperature drying device.
- 2. The apparatus of claim 1, wherein a -grade drying conveyor belt is arranged in the -grade low-temperature drying chamber, a two-grade drying conveyor belt is arranged in the two-grade low-temperature drying chamber, and the -grade drying conveyor belt and the two-grade drying conveyor belt independently comprise multiple layers of conveyor belts, wherein the conveying directions of the adjacent conveyor belts are opposite.
- 3. The apparatus of claim 2, wherein the number of conveyor belts of the -stage drying conveyor belt and the two-stage drying conveyor belt is 4-5 independently.
- 4. The apparatus of claim 1, wherein the heat pump is connected to an -stage low-temperature drying chamber air inlet and a heat transfer outer chamber air inlet through an electric three-way valve, the output of the hot dry air is adjusted through the electric three-way valve, when only the -stage low-temperature drying system is started, the electric three-way valve outputs the hot dry air to the -stage low-temperature drying chamber only, when only the second-stage low-temperature drying system is started, the electric three-way valve outputs the hot dry air to the heat transfer outer chamber only, and when the -stage low-temperature drying system and the second-stage low-temperature drying system are started simultaneously, the electric three-way valve outputs the hot dry air to the -stage low-.
- 5. The device according to claim 1 or 2, characterized in that the lowest conveyor belt discharging side of the -grade low-temperature drying chamber is provided with -grade drying adjusting baffle plates and -grade dried sludge discharging ports, wherein the -grade drying adjusting baffle plates are used for controlling the sludge discharging direction of -grade low-temperature drying chamber sludge.
- 6. The device according to claim 1 or 2, wherein a secondary drying adjusting baffle and a secondary dried sludge outlet are arranged on the discharge side of the conveyor belt at the lowest part of the secondary low-temperature drying chamber, and the secondary drying adjusting baffle is used for controlling the sludge outlet direction of the sludge in the secondary low-temperature drying chamber and controlling the opening and closing of the secondary dried sludge outlet.
- 7. The device of claim 1, wherein the low-temperature sludge drying device is further provided with a main water outlet, and liquid outlets of the -stage drying gas-liquid separator and the -stage drying gas-liquid separator are connected with the main water outlet through pipelines.
- 8. The device of claim 1, wherein filter materials in the -grade drying filter and the two-grade drying filter are filter cotton cores or activated carbon.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110078349A (en) * | 2019-05-31 | 2019-08-02 | 广州市广环环保科技有限公司 | A kind of sludge at low temperature desiccation apparatus and method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110078349A (en) * | 2019-05-31 | 2019-08-02 | 广州市广环环保科技有限公司 | A kind of sludge at low temperature desiccation apparatus and method |
| CN110078349B (en) * | 2019-05-31 | 2024-03-08 | 广州市广环环保科技有限公司 | Sludge low-temperature drying device and method |
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