CN104949135A - Multi-temperature particle heat source drying device and method - Google Patents
Multi-temperature particle heat source drying device and method Download PDFInfo
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- CN104949135A CN104949135A CN201510373089.0A CN201510373089A CN104949135A CN 104949135 A CN104949135 A CN 104949135A CN 201510373089 A CN201510373089 A CN 201510373089A CN 104949135 A CN104949135 A CN 104949135A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
- F23G7/001—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals for sludges or waste products from water treatment installations
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
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- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
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- Hydrology & Water Resources (AREA)
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- Drying Of Solid Materials (AREA)
Abstract
The invention provides a drying device and method. According to the drying device and method, one or more different-temperature particle heat carriers serve as heat sources and are sequentially added into a fluidized bed in a segmented mode to dry substances such as sludge. The problems that a current device and method for drying the substances such as the sludge are complex and high in running cost are mainly solved. All the heat sources of the drying device come from the particle heat carriers, most of the heat for heating the particle heat carriers is provided by the heat generated in a burning hearth in the burning process, and particles can be heated by the heat to be higher than 600 DEG C to be high-temperature particle heat carriers; a small amount of the heat is obtained by heat exchange with exhaust gas leaving the hearth, the temperature of the particles is lower than 600 DEG C, and the particles are the medium-temperature particle heat carriers. Due to changes in heat carrier media, the heat transferring process and the mass transferring process which are required by drying the substances such as the sludge are enhanced; the device structure is simplified; the device investment and the running cost are remarkably reduced.
Description
Technical field
The present invention relates to equipment and the drying method of the material mummification such as a kind of mud, be specifically related to a kind of particle heat carrier different by one or more temperature and make thermal source, segmentation adds in a fluid bed successively by the drying equipment of the material mummification such as mud and drying method.
Background technology
At present, market exists the fluid bed sludge drying device of number of different types, but the above-mentioned fluid bed sludge drying device overwhelming majority is for thermal source with conduction oil, high-pressure water heating or steam, these heat-conducting mediums obtain heat by metal heat-exchange face from combustion furnace, then transfer heat to the materials such as mud by metal heated face.Chinese Academy of Sciences's Engineering Thermophysics make little share thermal source with the partial particulate under incinerator high temperature cyclone separator first, most of heat is still transmitted by conduction oil, causes equipment numerous and diverse by metal heated transferring heat, investment and operating cost high.
Summary of the invention
The invention provides a kind of particle heat carrier different by one or more temperature and make thermal source, it is interior by the drying equipment of the material mummification such as mud and drying method that segmentation adds a fluid bed successively, mainly solves the problems that material drying and other treatment Apparatus and method for is numerous and diverse, operating cost is high such as mud.
Technology resolving ideas of the present invention is as follows:
Whole thermals source of drying equipment involved by the present invention are all from particle heat carrier.The heat energy of heated particle heat carrier, the heat that produced by combustion process in burner hearth of major part provides, and they can by more than heating particles to 600 DEG C (high-temperature particle heat carrier); Small part then needs by obtaining do heat exchange with the flue gas leaving burner hearth, and its temperature is (middle temperature particle heat carrier) below 600 DEG C.
Utilize one or more particle heat exchange mode difference; wish that one or more particle segmentation adds in a fluid bed drying equipment successively and mummification is carried out to materials such as mud; namely high-temperature particle adds the initial segment of mummification fluid bed in advance; after about 80% moisture removal in the materials such as mud; warm particle in the stage casing of mummification fluid bed adds, has continued mummification again.
Because the materials such as dewatered sludge are easy to volatilization and spontaneous combustion, various drying process is all paid close attention to, and does one's utmost to be avoided.And the initial temperature that particle heat carrier enters drying equipment is close to even far above material ignition temperatures such as dewatered sludges, and high-temperature particle thing quantity is large, avoid volatilization and spontaneous combustion even more important to material drying process such as the mud that the present invention proposes.Control temperature, humidity and atmosphere avoid the key point of volatilization and spontaneous combustion, and control temperature and humidity realize by avoiding the materials such as low humidity mud and high-temperature heat carrier particle contacts.
Technical solution of the present invention is as follows:
This many temperature particle thermal source drying equipment comprises fluid bed, and be provided with N number of dividing plate (N is natural number) in described fluid bed, dividing plate, by being divided into N+1 section in fluid bed, comprises the initial segment, stage casing and latter end, and at least one stage casing is provided with material inlet; Every section includes emulsion zone and dilute-phase zone, the material compact district of close fluidized-bed bottom is emulsion zone, close fluid bed top material rarefaction is dilute-phase zone, is provided with the gap for Flow of Goods and Materials between dividing plate top and fluid bed top, bottom dividing plate and between fluidized-bed bottom.
Aforementioned barriers comprises emulsion zone dividing plate and dilute-phase zone dividing plate, and the compartment cross-sectional width that in same section, emulsion zone dividing plate is formed is less than, equal the compartment cross-sectional width of dilute-phase zone dividing plate formation.
Between aforementioned barriers top and fluid bed top, the height in gap is more than 0.5 meter, and the clearance height bottom dividing plate and between fluidized-bed bottom is less than 1/2 of static thickness of feed layer.
The top of above-mentioned fluid bed is provided with gas vent away from material inlet side, emulsion zone divider upright is in fluid bed sole length direction, dilute-phase zone dividing plate tilts to gas outlet from bottom to top, and the angle between dilute-phase zone dividing plate and emulsion zone dividing plate vertical line reverse extending line is 0-45 °.
Passing into temperature between the emulsion zone of above-mentioned the initial segment and dilute-phase zone is more than 600 DEG C, granularity is the high-temperature particle heat carrier of less than 600 microns, passing into temperature between the emulsion zone at least one stage casing and dilute-phase zone is less than 600 DEG C, and granularity is the middle temperature particle heat carrier of more than 400 microns.
In trapezium structure bottom the lateral section of above-mentioned fluid bed.
The drying method of this many temperature particle thermal source comprises the following steps:
1] the initial segment process
1.1] to get temperature be the high-temperature particle heat carrier of more than 600 DEG C and treat the material grains such as wet mud of mummification, both sent into respectively in process chamber through fluidizing gas fluidisation, mixing mummification; Be blown into bottom the initial segment of fluidizing gas treated room;
1.2] steam produced in drying process and the material grains such as fluidizing gas and trickle mud rise and enter stage casing by upper channel and process, and other particles enter stage casing process by foot passage;
2] stage casing process
2.1] to stage casing send into temperature be less than 600 DEG C in warm particle heat carrier, by middle temperature particle heat carrier and after step 1 processes through top passageway and foot passage feeding mixing of materials and utilize fluid bed to carry out mummification; Fluidizing gas treated room is blown into bottom stage casing;
2.2] steam produced in drying process and the material grains such as fluidizing gas and trickle mud rise and enter latter end process by upper channel, and other particles enter latter end process by foot passage;
Described stage casing is treated to one or many and is cycled to repeat;
3] latter end process
3.1] mummification is carried out to after step 2 process through the material of top passageway and foot passage feeding latter end; Be blown into bottom the latter end of fluidizing gas treated room;
3.2] steam produced in drying process and the material grains such as fluidizing gas and trickle mud rise and discharge, and cooled middle temperature particle heat carrier, high-temperature particle heat carrier and the material grains such as mud completing mummification are discharged through discharge gate;
Above-mentioned steps 1 to 3 is carried out in process, needs the indoor fluidizing gas of continuous replacement Treatment and topping up.
The granularity of above-mentioned high-temperature particle heat carrier is less than 600 microns, and real density is 2 ~ 3g/cm
3; The granularity of described middle temperature particle heat carrier is more than 400 microns, and real density is 2 ~ 3g/cm3.
Above-mentioned chamber bottom to a 1 ~ 1.3 times static thickness of feed layer scope is emulsion zone, and emulsion zone top is dilute-phase zone, and the initial segment emulsion zone surface area thermic load is (0.5 ~ 2) X10
6kJ/m
2h, the initial segment dilute-phase zone top cross sectional area thermic load is (0.2 ~ 1) X10
6kJ/m
2h.
The invention has the advantages that:
Many temperature particle thermal source drying equipment provided by the invention and the drying method specifically segmentation of one or more particle thermal source add material drying equipment and the drying methods such as the mud of a fluid bed, utilize the heat carrier that two kinds different, by the change to heat-carrying agent medium, enhance the necessary heat transfer of material mummification, the mass transport processes such as mud; Simplify equipment structure; The investment of remarkable minimizing equipment and operating cost.
Meanwhile, the present invention effectively reduces the energy consumption of drying equipment and drying method by reducing fluidization gas flow.
Accompanying drawing explanation
Fig. 1 is the drying equipment front view of the present invention's many temperature particle thermal source;
Fig. 2 is the drying equipment left view of the present invention's many temperature particle thermal source;
Accompanying drawing is detailed as follows:
High-temperature particle heat carrier 1; Middle temperature particle heat carrier 2; The material grainses 3 such as wet mud; Fluid bed 4; Discharge gate 5; Fluidizing gas 6; Air distribution plate 7; Emulsion zone 8; Dilute-phase zone 9; Dividing plate 10,11; The initial segment 12; Stage casing 13; Latter end 14; Lower passage 15,17; Upper channel 16,18; Gas vent 19; Discharge gate 20,21.
Detailed description of the invention
Below the principle of the invention is described in detail:
1, mummification fluid bed is from matter inlet ends such as wet mud to material outlet end sections of being divided into such as dewatered sludges, between section and section, dividing plate is set, dividing plate ensures to be communicated with bottom emulsion zone, and emulsion zone top and dilute-phase zone bottom are cut off, therefore the larger particles being positioned at epimere material can enter next section by the passage under dividing plate, subparticle is brought into next section by dividing plate upper channel by air-flow, and the material being positioned at next section can not return to upper end, thus avoid the materials such as low humidity mud to return the epimere with high-temperature particle, also high-temperature particle is avoided without cooling " short circuit " close to material grainses such as low humidity mud.
2, the materials such as mud that wet all send into first section that is positioned at entrance point, and high-temperature particle heat carrier is also admitted to this section.Because high-temperature and high humility particle are admitted to this section simultaneously, large water gaging evaporates wherein, and these steam upwards flow, and enhance fluid mapper process, and produce strong geology, heat exchange in this section of emulsion zone, high-temperature particle is lowered the temperature rapidly.Due to feed this section particle entrained by heat just complete about 80% of mummification institute calorific requirement, be not enough to the materials such as whole mud to complete mummification.Wherein, in the materials such as mud, part fine particle may complete mummification, and due to a large amount of newborn steam rate of climb very high, these fine particles once mummification will rapidly by elutriation, carry secretly and enter upper space and enter second segment from upper channel.
The granularity of heat carrier particle is under the condition controlling the dilute-phase zone air-flow rate of climb, and they can enter rapidly fluid bed emulsion zone and mix with bed endoparticle and lowered the temperature rapidly.Stay the materials such as the bulky grain mud of emulsion zone because of heating load deficiency, moisture is still very high.High-temperature particle lower the temperature rapidly and in emulsion zone the material grains moisture such as mud still very high becoming avoid volatilizing and the essential condition of spontaneous combustion; Middle temperature particle heat carrier is admitted to stage casing.The situation in stage casing is significantly different from the initial segment, and first, flowed into from epimere by the high-temperature particle heat carrier particle of lowering the temperature in a large number, they have sizable thermal capacity simultaneously; Also comparatively juicy is contained in the material grainses such as next mud; And the middle temperature particle heat carrier temperature be admitted to is lower than material ignition temperatures such as dewatered sludges, under live steam and fluidizing gas effect, bed endoplasm, heat exchange intensity are much lower, but the particle being also enough to make newly to add is lowered the temperature rapidly, although the material grains humidity such as mud reduce further, because stage casing bulk temperature level is low, volatilization and spontaneous combustion can be avoided equally; The material grainses such as mud are in the stage fluidized bed interior mummification that finally completes, and in this section, although the material grains water content such as mud are very low, the temperature of particle has been no more than 120 DEG C, naturally there is not the danger of volatilization and spontaneous combustion.If with rely on metal heated by compared with the technique of mummification heat, although the heat-carrying agent medium initial temperature of drying equipment involved by the present invention is far high, but the medium temperature contacted with materials such as inflammable dewatered sludges is less than the particle of 120 DEG C, instead of the heating surface of about 200 of other techniques DEG C.Obvious security of the present invention greatly improves.
3, the basic assurance of spontaneous combustion is avoided to be make fluidizing agent with inert gas.In running, still have a small amount of gaseous volatilization, outside air also to the region seepage in negative pressure state, therefore will may constantly replace drying equipment fluidizing gas and topping up.
Another feature of the present invention reduces fluidization gas flow.Fluidization gas flow affects drying equipment energy consumption.Existing take conduction oil as the fluid bed desiccation apparatus of the Shanghai factory of heat-carrying agent, material quantity not sufficient 240 ton per days such as disposing sludge, drying equipment fluidized wind equipment used is two tandem high pressure wind devices, electricity place capacity is 2X110KW, and the present invention can the material such as mud of fluidized wind equipment actual power consumption process 240 ton per day of 16KW.The two blast head is close, and fluidizing gas consumption differs more than 10 times.Fluidizing gas consumption also affects the performance reclaiming mummification live steam equipment for condensation.Above-mentioned is that equipment fluidizing gas volume flow and the live steam volume of heat-carrying agent is suitable with conduction oil, and relevant device fluidizing gas volume flow of the present invention is only 1/10 of live steam amount.Fluidization gas flow is large, and improve the flow velocity of mist import department first exponentially, after steam condenses gradually, mist flow velocity in a device more can differ several times to tens times.For ensureing gas residence time, the large fluidized gas scale of construction will add large equipment yardstick.The share of fluidizing gas in mist, affects vapo(u)rous temperature, and when the fluidized gas scale of construction is large, saturation temperature is high, and condense same quantity steam, needs lower chilling temperature.Except adopting particle heat carrier to be thermal source, the function of strengthening drying equipment, create outside primary condition for reducing the fluidized gas scale of construction, the present invention structurally uses the trapezoidal bed of deep bed sintering, vast scale and variable speed three measures simultaneously.
So-called deep bed sintering is that the static thickness of feed layer of requirement is greater than 1.5m.The vertical section of vertical bed length direction is trapezoidal, and emulsion zone upper surface width is 5-12 times of bottom width.Variable speed is large for steam generation difference in different section, and in the initial segment, quantity of steam is large, and the fluidized gas scale of construction can be little, and latter end quantity of steam is few, and the fluidized gas scale of construction should be large.
In response to flue gas heat exchange equipment requirement, middle temperature particle heat carrier grain graininess higher temperatures particle heat carrier granularity is large.At drying equipment end, two kinds of heat carrier particles and the material grainses such as dewatered sludge are because granularity, density are different and the upper and lower speed difference of trapezoidal bed and occur layering.Middle temperature particle heat carrier is in bottom, and they are discharged by from bottom discharge mouth; The material grainses such as high-temperature particle heat carrier and dewatered sludge are in upper strata, and they are discharged by from the discharging opening being positioned at surface.
Heat carrier particle material requires that its real density is 2-3g/cm
3.
Below in conjunction with accompanying drawing, the present invention is described in detail, as shown in Figure 1:
Whole thermals source of the fluid bed drying equipment of the materials such as dewatered sludge are solid particle heat carriers, wherein absorption provides the heat in the burner hearth of the combustion furnace of heat, its temperature is more than 600 DEG C, and granularity is less than 600 microns, is called as high-temperature particle heat carrier 1; Another absorbs the gas-solid heat exchanger of combustion furnace afterbody heat from leaving, its temperature is less than 600 DEG C, and granularity is more than 400 microns, is called as middle temperature particle heat carrier 2.
The material grainses 3 such as mud that all wet are sent into from fluid bed one end 4, discharge, fluid bed is called fluid bed length direction from matter inlet end to ports of export such as mud after mummification from the other end 5.The static thickness of feed layer of fluid bed is 1.5-2.5 rice.Fluidizing gas 6 feeds from the air distribution plate 7 being positioned at fluidized-bed bottom, is called as emulsion zone 8, it is called as dilute-phase zone 9 within the scope of air distribution plate to 1.2 times static thickness of feed layer.Fluid bed emulsion zone is trapezoidal perpendicular to the section of length direction, and upper end width is 5-12 times of bottom width.Arrange two dividing plates 10,11 in fluid bed, at emulsion zone, they are perpendicular to bed length direction, and tilt to the port of export from bottom to top at dilute-phase zone dividing plate, are less than 45 ° with vertical line angle.The minimum limit of dividing plate and fluidized-bed bottom air distribution plate distance are less than 1/2 of the static thickness of feed layer of fluid bed.Dividing plate top is apart from more than 0.5 meter, drying equipment top board.Fluid bed is divided into initial, stage casing, latter end section, i.e. the initial segment 12, stage casing 13 and latter end 14.According to the heat Calculation that high-temperature particle heat carrier is brought into, the initial segment emulsion zone surface area thermic load is (0.5-2) X10
6kJ/m
2h, the initial segment dilute-phase zone top cross sectional area thermic load is (0.2-1) X10
6kJ/m
2h.
Temperature is that the high-temperature particle heat carrier 1 of more than 600 DEG C is admitted to the initial segment emulsion zone surface, after mixing, cooling, enter stage casing emulsion zone together with the material grains such as mud by the passage 15 under the space bar that is positioned at fluid bed the initial segment and stage casing.The steam that the initial segment produces rises and carries the material grainses such as trickle mud and enters fluid bed stage casing dilute-phase zone from the passage 16 being positioned at more than dividing plate together with the fluidizing gas fed from bottom.Temperature is that the middle temperature particle heat carrier 2 of less than 600 DEG C is admitted to emulsion zone surface, stage casing, after mixing, cooling, enter latter end emulsion zone together with the material grains such as mud by the passage 17 under the space bar that is positioned at fluid bed stage casing and latter end.The steam that stage casing produces rises and carries the material grainses such as trickle mud and enters fluid bed latter end dilute-phase zone from the passage 18 being positioned at more than dividing plate together with the fluidizing gas fed from bottom.
Drying equipment gas vent 19 is positioned at latter end top.Cooled middle temperature particle heat carrier is discharged by the discharge gate 20 be positioned at bottom latter end terminal; Discharged by the discharge gate 21 being positioned at latter end terminal end surface together with cooled high-temperature particle heat carrier and the material grains such as mud completing mummification.
To be good in trapezium structure bottom the lateral section of fluid bed, as shown in Figure 2, the drying equipment left view of many temperature particle thermal source namely embody fluid bed lateral section bottom in trapezoidal.
The present invention is proved further below in conjunction with specific embodiment:
Embodiment
The fluid bed drying equipment of the materials 240 tons such as moisture 80% mud of day mummification, in 850 DEG C of high-temperature particle heat carriers 24 tons/hour and 300 DEG C, warm particle heat carrier 24 tons/hour is mummification thermal source.The long 5.2m of bottom air distribution plate, wide 0.2m.Static thickness of feed layer 2m.Establish two dividing plates along bed length, the initial segment emulsion zone length is 2.5m, and stage casing and latter end are 1.4m.Drying equipment height overall 5m.The initial segment air distribution plate place fluidizing gas empty tower gas velocity is 0.2m/s; Stage casing is 0.3m/s; Latter end is 0.4m/s.
The long 5.2m of bottom air distribution plate, wide 0.2m.Static thickness of feed layer 2m.
Claims (9)
1. the drying equipment of the thermal source of temperature particle more than a kind, comprise fluid bed, it is characterized in that: in described fluid bed, be provided with N number of dividing plate, N is natural number, dividing plate, by being divided into N+1 section in fluid bed, comprises the initial segment, stage casing and latter end, the initial segment is provided with the import of high-temperature particle heat carrier, and at least one stage casing is provided with the import of middle temperature particle heat carrier; Every section includes emulsion zone and dilute-phase zone, is provided with the gap for Flow of Goods and Materials between dividing plate top and fluid bed top, bottom dividing plate and between fluidized-bed bottom.
2. the drying equipment of many temperature particle thermal source according to claim 1, it is characterized in that: described dividing plate comprises emulsion zone dividing plate and dilute-phase zone dividing plate, the compartment cross-sectional width that in same section, emulsion zone dividing plate is formed be less than, equal the compartment cross-sectional width of dilute-phase zone dividing plate formation.
3. the drying equipment of many temperature particle thermal source according to claim 2, it is characterized in that: between described dividing plate top and fluid bed top, the height in gap is more than 0.5 meter, the clearance height bottom dividing plate and between fluidized-bed bottom is less than 1/2 of static thickness of feed layer.
4. the drying equipment of many temperature particle thermal source according to claim 3, it is characterized in that: the top of described fluid bed is provided with gas vent away from material inlet side, emulsion zone divider upright is in fluid bed sole length direction, dilute-phase zone dividing plate tilts to gas outlet from bottom to top, and the angle between dilute-phase zone dividing plate and emulsion zone dividing plate vertical line reverse extending line is 0-45 °.
5. according to the drying equipment of the arbitrary described many temperature particle thermal source of Claims 1-4, it is characterized in that: passing into temperature between the emulsion zone of described the initial segment and dilute-phase zone is more than 600 DEG C, granularity is the high-temperature particle heat carrier of less than 600 microns, passing into temperature between the emulsion zone at least one stage casing and dilute-phase zone is less than 600 DEG C, and granularity is the middle temperature particle heat carrier of more than 400 microns.
6. the drying equipment of many temperature particle thermal source according to claim 5, is characterized in that: in trapezium structure bottom the lateral section of described fluid bed.
7. a drying method for the particle of temperature more than thermal source, is characterized in that, comprise the following steps:
1] the initial segment process
1.1] to get temperature be the high-temperature particle heat carrier of more than 600 DEG C and treat the material grains such as wet mud of mummification, both to be sent into respectively in process chamber through fluidizing gas mixing and mummification; Be blown into bottom the initial segment of fluidizing gas treated room;
1.2] steam produced in drying process and the material grains such as fluidizing gas and trickle mud rise and enter stage casing by upper channel and process, and other particles enter stage casing process by foot passage;
2] stage casing process
2.1] to stage casing send into temperature be less than 600 DEG C in warm particle heat carrier, by middle temperature particle heat carrier and after step 1 processes through top passageway and foot passage feeding mixing of materials and utilize fluid bed to carry out mummification; Fluidizing gas treated room is blown into bottom stage casing;
2.2] steam produced in drying process and the material grains such as fluidizing gas and trickle mud rise and enter latter end process by upper channel, and other particles enter latter end process by foot passage;
Described stage casing is treated to one or many and is cycled to repeat;
3] latter end process
3.1] mummification is carried out to after step 2 process through the material of top passageway and foot passage feeding latter end; Be blown into bottom the latter end of fluidizing gas treated room;
3.2] steam produced in drying process and the material grains such as fluidizing gas and trickle mud rise and discharge, and cooled middle temperature particle heat carrier, high-temperature particle heat carrier and the material grains such as mud completing mummification are discharged through discharge gate;
Above-mentioned steps 1 to 3 is carried out in process, needs the indoor fluidizing gas of continuous replacement Treatment and topping up.
8. the drying method of many temperature particle thermal source according to claim 7, is characterized in that: the granularity of described high-temperature particle heat carrier is less than 600 microns, and real density is 2 ~ 3g/cm3; The granularity of described middle temperature particle heat carrier is more than 400 microns, and real density is 2 ~ 3g/cm3.
9. the drying method of many temperature particle thermal source according to claim 8, it is characterized in that: described chamber bottom to a 1 ~ 1.3 times static thickness of feed layer scope is emulsion zone, emulsion zone top is dilute-phase zone, and the initial segment emulsion zone surface area thermic load is (0.5 ~ 2) X10
6kJ/m
2h, the initial segment dilute-phase zone top cross sectional area thermic load is (0.2 ~ 1) X10
6kJ/m
2h.
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Cited By (1)
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| CN107311424A (en) * | 2017-06-29 | 2017-11-03 | 俞国豪 | Wet sludge anhydration method and fluid bed drying device |
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Application publication date: 20150930 |