CN107702515B - Drying method and drying device for porous calcium silicate material - Google Patents
Drying method and drying device for porous calcium silicate material Download PDFInfo
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- CN107702515B CN107702515B CN201710995531.2A CN201710995531A CN107702515B CN 107702515 B CN107702515 B CN 107702515B CN 201710995531 A CN201710995531 A CN 201710995531A CN 107702515 B CN107702515 B CN 107702515B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B17/00—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement
- F26B17/18—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by rotating helical blades or other rotary conveyors which may be heated moving materials in stationary chambers, e.g. troughs
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/005—Drying-steam generating means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B23/00—Heating arrangements
- F26B23/10—Heating arrangements using tubes or passages containing heated fluids, e.g. acting as radiative elements; Closed-loop systems
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Abstract
The invention provides a drying method and a drying device for a porous calcium silicate material, wherein the drying method comprises the following steps: 1) carrying out primary preheating on the porous calcium silicate material to obtain primary dried porous calcium silicate, wherein the water content of the primary dried porous calcium silicate is reduced by 10-15% compared with that of the porous calcium silicate material; 2) carrying out secondary preheating on the primary dried porous calcium silicate to obtain secondary dried porous calcium silicate, wherein the water content of the secondary dried porous calcium silicate is reduced by 80-90% compared with that of the porous calcium silicate material; 3) and drying the secondary dried porous calcium silicate to obtain a porous calcium silicate product, wherein the water content of the porous calcium silicate product is lower than 5%. The drying method and the drying device for the porous calcium silicate material can realize effective drying of the high-moisture porous calcium silicate material, and the water content of the dried porous calcium silicate product is lower than 5%.
Description
Technical Field
The invention relates to a drying technology, in particular to a drying method and a drying device for a porous calcium silicate material, and belongs to the technical field of chemical industry.
Background
In the production process of extracting alumina by the fly ash pre-desilication soda lime sintering method, fly ash desilication is one of the key processes, and meanwhile, because the fly ash contains almost as much silicon element as aluminum element in the fly ash, the fly ash after desilication not only improves the aluminum-silicon ratio and meets the requirement of alumina production, but also forms a large amount of sodium silicate solution. These sodium silicate solutions both recover a large amount of alkali and form a new substance, porous calcium silicate, by reaction with lime milk.
Due to the special porous structure of the porous calcium silicate, no matter vacuum filtration or plate-and-frame filter pressing is adopted, the moisture of the porous calcium silicate is difficult to reduce to a dry degree by adopting a physical method, 70-78% of moisture is still contained after filtration, and most of the moisture is capillary water, so that the transportation and the use of the porous calcium silicate material are limited. Therefore, only the drying method can reduce the moisture content to the requirement of convenient transportation and industrial use.
Because the substance belongs to a novel material, the market recognition is insufficient, and few enterprises are produced and researched, only one existing drying method which is confirmed by production is provided, namely a flash dryer and a rotary kiln type dryer two-stage drying process. Through multiple tests, other single drying equipment has low drying yield and high energy consumption due to high material moisture, and the problem of drying porous calcium silicate is difficult to effectively solve.
Disclosure of Invention
Aiming at the problems of the existing method for drying the porous calcium silicate with high moisture, the invention provides the drying method and the drying device for the porous calcium silicate material, which can not only realize the drying treatment of the porous calcium silicate with high moisture with high efficiency, but also improve the reliability, the drying efficiency and the heat utilization rate of drying equipment and effectively reduce the drying energy consumption.
The invention provides a drying method of a porous calcium silicate material, which comprises the following steps:
1) carrying out primary preheating on the porous calcium silicate material to obtain primary dried porous calcium silicate, wherein the water content of the primary dried porous calcium silicate is reduced by 10-15% compared with that of the porous calcium silicate material;
2) carrying out secondary preheating on the primary dried porous calcium silicate to obtain secondary dried porous calcium silicate, wherein the water content of the secondary dried porous calcium silicate is reduced by 80-90% compared with that of the porous calcium silicate material;
3) and drying the secondary dried porous calcium silicate to obtain a porous calcium silicate product, wherein the water content of the porous calcium silicate product is lower than 5%.
The drying method of the porous calcium silicate material, wherein in the step 1), the primary preheating is performed by using a slurry dryer, and a drying medium in the slurry dryer is steam or air flow at the temperature of 100-150 ℃.
The drying method of the porous calcium silicate material, wherein in the step 2), a rotary kiln type dryer or a tubular dryer is adopted for secondary preheating, and a drying medium in the rotary kiln type dryer or the tubular dryer is steam or wind flow at the temperature of 100-150 ℃.
The drying method of the porous calcium silicate material, wherein in the step 3), a flash dryer is adopted for drying, and the drying medium of the flash dryer is steam or air flow at 100-150 ℃.
The drying method of the porous calcium silicate material comprises a primary preheating unit, a secondary preheating unit, a drying unit and a production and collection unit;
the discharge port of the primary preheating unit is communicated with the feed port of the secondary preheating unit, the discharge port of the secondary preheating unit is communicated with the feed port of the drying unit, and the discharge port of the drying unit is communicated with the product collecting unit;
the primary preheating unit is used for preheating the porous calcium silicate material to obtain primary dried porous calcium silicate, and the water content of the primary dried porous calcium silicate is reduced by 10-15% compared with that of the porous calcium silicate material;
the secondary preheating unit is used for preheating the primary drying porous calcium silicate material to obtain secondary drying porous calcium silicate, and the water content of the secondary drying porous calcium silicate is reduced by 80-90% compared with that of the porous calcium silicate material;
the drying unit is used for drying the secondary dried porous calcium silicate material to obtain a porous calcium silicate product, and the water content of the porous calcium silicate product is lower than 5%.
The drying method of the porous calcium silicate material, wherein the medium inlet of the drying unit is communicated with the medium outlet of the heat exchange unit.
The method for drying porous calcium silicate material, wherein the method further comprises a drying medium condensing unit and a heating unit;
the waste steam outlet of the primary preheating unit, the waste steam outlet of the secondary preheating unit and the waste steam outlet of the heat exchange unit are respectively communicated with the inlet of the drying medium condensing unit, the drying medium outlet of the drying medium condensing unit is communicated with the inlet of the heating unit, the outlet of the heating unit is respectively communicated with the medium inlet of the primary preheating unit, and the medium inlet of the secondary preheating unit is communicated with the medium inlet of the heat exchange unit.
The method for drying the porous calcium silicate material further comprises a first dust removal unit and a second dust removal unit;
the first dust removal unit is arranged between the secondary preheating unit and the drying unit, a discharge hole of the secondary preheating unit is communicated with a feed hole of the first dust removal unit, and a discharge hole of the first dust removal unit is communicated with a feed hole of the drying unit;
the second dust removal unit is arranged between the drying unit and the product collection unit, a discharge hole of the drying unit is communicated with a feed inlet of the second dust removal unit, and a discharge hole of the second dust removal unit is communicated with the product collection unit.
The drying method of the porous calcium silicate material, wherein the gas outlet of the second dust removal unit is communicated with the medium inlet of the secondary preheating unit;
and a gas outlet of the first dust removal unit is communicated with a gas inlet of the dust collection unit, and a liquid outlet of the dust collection unit and a liquid outlet of the drying medium condensation unit are respectively communicated with the porous calcium silicate washing unit.
The drying method of the porous calcium silicate material, wherein the primary preheating unit is a slurry dryer, the secondary preheating unit is a rotary kiln dryer or a shell-and-tube dryer, and the drying unit is a flash dryer.
The implementation of the invention has at least the following advantages:
1. the drying method of the porous calcium silicate material can realize effective drying of the porous calcium silicate material with high moisture content, and the water content in the dried porous calcium silicate product is lower than 5%;
2. the drying method of the porous calcium silicate material can be beneficial to the transportation of the porous calcium silicate and the realization of wide industrial application;
3. the device for preparing the porous calcium silicate material is reliable, and is beneficial to effectively drying the porous calcium silicate material with high moisture;
4. the device for the porous calcium silicate material can realize the high-efficiency drying of the high-moisture porous calcium silicate material, improve the heat utilization rate and reduce the energy consumption for drying the high-moisture porous calcium silicate material.
5. The device for the porous calcium silicate material can realize the efficient drying of the high-moisture porous calcium silicate material, can be used for drying other similar high-moisture materials, and has a wide application prospect in the aspects of chemical industry and civilian use.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
FIG. 1 is a flow diagram of a method of drying a porous calcium silicate material according to the present invention;
FIG. 2 is a schematic structural diagram of a first embodiment of an apparatus for drying a porous calcium silicate material according to the present invention;
FIG. 3 is a schematic structural view of a second embodiment of the drying apparatus for porous calcium silicate material according to the present invention;
fig. 4 is a schematic structural diagram of a third embodiment of the drying apparatus for porous calcium silicate material according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
FIG. 1 is a flow diagram of a method for drying a porous calcium silicate material according to the present invention. As shown in fig. 1, the method for drying a porous calcium silicate material comprises:
s101: and primary preheating is carried out on the porous calcium silicate material to obtain primary dried porous calcium silicate.
The water content of the first-stage drying porous calcium silicate is reduced by 10-15% compared with the water content of the porous calcium silicate material.
The porous calcium silicate material refers to porous calcium silicate with the water content of 70-78%, wherein the water content refers to the mass fraction of water in the porous calcium silicate material.
In the primary preheating process, a heating device with a double-spiral structure with a cavity can be adopted, wherein the directions of the two spiral structures are opposite, a drying medium, such as steam or wind flow at the temperature of 100-.
The heating equipment is adopted for primary preheating, so that the porous calcium silicate material can be conveyed and also can be preheated and dried, partial water content of the porous calcium silicate material is lost in the conveying process, and the obtained primary dried porous calcium silicate is ensured to contain more water than the porous calcium silicate material and is reduced by 10-15%.
S102: and carrying out secondary preheating on the primary dried porous calcium silicate to obtain secondary dried porous calcium silicate.
The water content of the secondary drying porous calcium silicate is reduced by 80-90% compared with the water content of the porous calcium silicate material.
In the secondary preheating process, a heating device with large volume and low rotating speed, in which a heat medium is not directly contacted with the primary drying porous calcium silicate, can be adopted, so that the effective degree of secondary preheating and the preheating time can be ensured, for example, the volume can reach 20-60m3The rotating speed is 10-20 r/min.
The primary drying porous calcium silicate is preheated in the second stage, so that the water content of the obtained secondary drying porous calcium silicate is reduced by 80-90% compared with that of the porous calcium silicate material.
S103: and drying the secondary dried porous calcium silicate to obtain a porous calcium silicate product.
The water content of the porous calcium silicate product is less than 5%.
In the drying process, quick drying equipment can be adopted to dry the secondary dried porous calcium silicate, and finally a porous calcium silicate product is obtained.
The drying of the porous calcium silicate material is processed step by step, namely a drying method of two-stage preheating and one-stage drying, and the high-efficiency drying of the porous calcium silicate material is finally realized by limiting the reduction value of the water content in each step of processing in the drying process of the porous calcium silicate material, so that a porous calcium silicate product with the water content lower than 5% is generated.
Specifically, in S101, a slurry dryer may be used for primary preheating, and the drying medium in the slurry dryer is steam or wind flow, wherein the temperature of the steam or wind flow is 100-. In addition to thisBesides, the rotating speed and the air inlet flow rate of the pulp dryer can be limited, for example, the rotating speed can be 3-20r/min, and the flow rate of the heating medium can be 1-10m3H is used as the reference value. Generally, the primary preheating time is related to the quality of the porous calcium silicate material to be treated, and the primary preheating time is 0.1-0.5h per 1000kg of the porous calcium silicate material.
In S102, a rotary kiln dryer or a tubular dryer may be used for secondary preheating, and the drying medium in the rotary kiln dryer or the tubular dryer is steam or air flow, wherein the temperature of the steam or air flow is 100-150 ℃, preferably 120-130 ℃. In addition, the speed of rotation and the volume of the rotary kiln dryer or shell-and-tube dryer can be limited, for example, the speed of rotation is 10-20r/min, and the volume is 20-60m3. Generally, the secondary preheating time is related to the quality of the treated primary dried porous calcium silicate, and the secondary preheating time of each 1000kg of the primary dried porous calcium silicate is 0.2-0.5 h.
In S103, a flash dryer may be used for drying, and the drying medium of the flash dryer is steam or wind flow, wherein the temperature of the steam or wind flow is 100-. Besides, the flow rate of the drying medium of the flash dryer can be limited, for example, the flow rate of the drying medium is 1000-3H is used as the reference value. Generally, the drying time is related to the quality and moisture of the treated secondary dried porous calcium silicate, and the drying time of 1000-3000kg of secondary dried porous calcium silicate with the moisture below 30 percent is 0.5-1 h.
The above method for drying a porous calcium silicate material can be realized by using the following apparatus for drying a porous calcium silicate material.
Fig. 2 is a schematic structural diagram of a first embodiment of the drying apparatus for porous calcium silicate material according to the present invention. As shown in fig. 2, the drying apparatus for porous calcium silicate material provided in this embodiment includes: the device comprises a primary preheating unit 1, a secondary preheating unit 2, a drying unit 3 and a product collecting unit 4; the discharge port of the primary preheating unit 1 is communicated with the feed port of the secondary preheating unit 2, the discharge port of the secondary preheating unit 2 is communicated with the feed port of the drying unit 3, and the discharge port of the drying unit 3 is communicated with the product collecting unit 4; the primary preheating unit 1 is used for preheating porous calcium silicate materials to obtain primary dried porous calcium silicate, and the water content of the primary dried porous calcium silicate is 10-15% lower than that of the porous calcium silicate materials; the secondary preheating unit 2 is used for preheating the primary drying porous calcium silicate material to obtain secondary drying porous calcium silicate, and the water content of the secondary drying porous calcium silicate is reduced by 80-90% compared with that of the porous calcium silicate material; the drying unit 3 is used for drying the secondary drying porous calcium silicate material to obtain a porous calcium silicate product, and the water content of the porous calcium silicate product is lower than 5%. It is conceivable that the inlet of the primary preheating unit communicates with the material collection unit 5.
The porous calcium silicate material refers to porous calcium silicate with the water content of 70-78%, wherein the water content refers to the mass fraction of water in the porous calcium silicate material.
The primary preheating unit 1 may be embodied as a heating device having a double spiral structure with a cavity, a drying medium, such as steam or wind current, may be introduced into the cavity, and the double spiral structure may be used for transporting the porous calcium silicate material, so that the drying medium in the spiral cavity may preheat the porous calcium silicate material. Wherein the temperature of the steam or the wind flow is 100-150 ℃, preferably 120-130 ℃.
By adopting the primary preheating unit 1 to carry out primary preheating, porous calcium silicate materials can be conveyed and also can be preheated and dried, so that part of water content of the porous calcium silicate materials is lost in the conveying process, and the obtained primary dried porous calcium silicate with higher water content is reduced by 10-15% compared with the porous calcium silicate materials.
After the primary preheating is finished, the primary drying porous calcium silicate is output from a discharge port of the primary preheating unit 1 and enters the secondary preheating unit 2 through a feed port of the secondary preheating unit 2 to be preheated for the second time. The secondary preheating unit 2 may be embodied as a heating device having a large volume and a low rotation speed without direct contact of a heat medium with the primary drying porous calcium silicate, thereby ensuring an effective degree of secondary preheating and preheating time, for example, a volume of 60-160m3The rotating speed is 10 to 20r/min。
The secondary preheating unit 2 is used for carrying out secondary preheating on the primary dried porous calcium silicate to reduce the water content of the obtained secondary dried porous calcium silicate to 80-90% compared with that of the porous calcium silicate material. The drying medium in the secondary preheating unit 2 is steam or wind flow, wherein the temperature of the steam or wind flow is 100-150 ℃, preferably 120-130 ℃.
After the secondary preheating is finished, the secondary drying porous calcium silicate is output from the discharge port of the secondary preheating unit 2 and enters the drying unit 3 through the feed port of the drying unit 3 to be dried. The drying unit 3 dries the secondary dried porous calcium silicate to ensure that the water content of the obtained porous calcium silicate product is lower than 5%. The secondary preheating unit 2 may be embodied as a rapid drying device, wherein the drying medium may be steam or air flow with a temperature of 100-.
Further, the medium inlet of the drying unit 3 is communicated with the medium outlet of the heat exchange unit 6. In the present invention, when the drying unit 3 is used for drying operation, the drying medium of the drying unit 3 can come from the heat exchange unit 6, wherein the heat exchange unit 6 is a unit for heating the cold fluid by utilizing the heat of the hot fluid to transfer to the cold fluid.
When the cold fluid in the heat exchange unit 6 is heated, the cold fluid flows out from the medium outlet of the heat exchange unit 6, and enters the drying unit 3 through the medium inlet of the drying unit 3, so that the secondary drying porous calcium silicate in the drying unit 3 is dried. Specifically, since the drying medium of the drying unit 3 in the present invention is steam or air flow at 100-. After the hot fluid enters the heat exchange unit 6 through the hot fluid inlet and the cold fluid entering the heat exchange unit 6 through the cold fluid inlet exchanges heat, the heated cold fluid can directly carry out drying operation on the secondary drying porous calcium silicate in the drying unit 3. The specific implementation manner of the heat exchange unit 6 in the present invention is not limited, and may be a common heat exchanger.
Fig. 3 is a schematic structural diagram of a second embodiment of the drying apparatus for porous calcium silicate material of the present invention, as shown in fig. 3, in order to further reduce energy consumption for drying the porous calcium silicate material, on the basis of the first embodiment, the drying apparatus for porous calcium silicate material provided in this embodiment further includes: a drying medium condensing unit 7 and a heating unit 8; the exhaust steam outlet of the primary preheating unit 1, the exhaust steam outlet of the secondary preheating unit 2 and the exhaust steam outlet of the heat exchange unit 6 are respectively communicated with the inlet of the drying medium condensing unit 7, the drying medium outlet of the drying medium condensing unit 7 is communicated with the inlet of the heating unit 8, the outlet of the heating unit 8 is respectively communicated with the medium inlet of the primary preheating unit 1, and the medium inlet of the secondary preheating unit 2 is communicated with the medium inlet of the heat exchange unit 6.
Because the drying media in the primary preheating unit 1 and the secondary preheating unit 2 are both steam or air flow, and the hot fluid in the heat exchange unit 6 is also steam or air flow, when the steam or air flow enters the primary preheating unit 1, the secondary preheating unit 2 and the heat exchange unit 6 to complete preheating or heat exchange, the steam or air flow is changed into exhaust steam with lower temperature and energy, therefore, in order to recycle the exhaust steam again and avoid energy waste, the drying media condensing unit 7 and the heating unit 8 are additionally arranged in the device. Here, the drying medium condensing unit 7 is a unit having a function of freezing the water-containing substance into a solid state, and then sublimating the water therein from the solid state into a gaseous state to remove the water and store the substance, and the heating unit 8 is a unit that heats the medium by electric power. The specific implementation manners of the drying medium condensing unit 7 and the heating unit 8 in the present invention are not limited, and may be a common freeze dryer and a common heater, respectively.
Wherein, the exhaust steam outlet of the primary preheating unit 1, the exhaust steam outlet of the secondary preheating unit 2 and the exhaust steam outlet of the heat exchange unit 6 are respectively communicated with the inlet of the drying medium condensation unit 7, because the three paths of exhaust steam are all contacted with calcium silicate containing water or the three paths of exhaust steam are respectively contacted with the calcium silicate containing water, after the three paths of exhaust steam enter the drying medium condensation unit 7, the exhaust steam is firstly frozen and dried by the drying medium condensation unit 7, after moisture is frozen and sublimated from the exhaust steam, the residual gas can escape from the drying medium outlet of the drying medium condensation unit 7, enters the heating unit 8 through the inlet of the heating unit 8 and is heated to 150 ℃, preferably 120-, The secondary preheating unit 2 and the heat exchange unit 6, therefore, the three paths of dead steam are dried and heated and then are reused as a drying medium or a heat fluid, so that the energy consumption is reduced, and the heat utilization rate is improved.
It should be noted that the exhaust steam outlet of the primary preheating unit 1, the exhaust steam outlet of the secondary preheating unit 2, and the exhaust steam outlet of the heat exchange unit 6 are respectively communicated with the inlet of the drying medium condensing unit 7, three paths of exhaust steam may enter the inlet of the drying medium condensing unit 7 after being merged in one pipeline, or three paths of exhaust steam may enter the drying medium condensing unit 7 through three inlets, respectively, and fig. 3 shows that three paths of exhaust steam enter the drying medium condensing unit 7 through three inlets, respectively.
Fig. 4 is a schematic structural diagram of a third embodiment of the drying apparatus for porous calcium silicate material according to the present invention, as shown in fig. 4, because the secondary preheating unit 2 and the drying unit 3 have a relatively large drying degree for calcium silicate, when calcium silicate is conveyed to a next unit through respective discharge ports, exhaust gas and dust generated by drying are simultaneously output, and in order to separate porous calcium silicate from the exhaust gas and dust, the drying apparatus for porous calcium silicate material provided in this embodiment further includes: a first dust removal unit 9 and a second dust removal unit 10; the first dust removal unit 9 is arranged between the secondary preheating unit 2 and the drying unit 3, a discharge hole of the secondary preheating unit 2 is communicated with a feed hole of the first dust removal unit 9, and a discharge hole of the first dust removal unit 9 is communicated with a feed hole of the drying unit 3; the second dust removal unit 10 is arranged between the drying unit 3 and the product collection unit 4, a discharge hole of the drying unit 3 is communicated with a feed inlet of the second dust removal unit 10, and a discharge hole of the second dust removal unit 10 is communicated with the product collection unit 4. The first dust removing unit 9 and the second dust removing unit 10 may be bag-type dust removers.
The secondary dried porous calcium silicate is output from the discharge port of the secondary preheating unit 2 and then enters the first dust removal unit 9 through the feed port of the first dust removal unit 9, after dust removal and waste gas removal, the secondary dried porous calcium silicate is output from the discharge port of the first dust removal unit 9 and then enters the drying unit 3 through the feed port of the drying unit 3 for subsequent treatment to generate a calcium silicate product.
The calcium silicate product also carries waste gas and dust materials, so that the calcium silicate product is output through the discharge port of the drying unit 3 and then enters the second dust removal unit 10 through the feed port of the second dust removal unit 10, and after the calcium silicate product is dedusted and the waste gas is removed, the porous calcium silicate product is output through the discharge port of the second dust removal unit 10 and then enters the product collection unit 4 to be collected.
Furthermore, the device can recycle the two paths of exhaust gas separated by the first dust removal unit 9 and the second dust removal unit 10. With continued reference to fig. 4, the gas outlet of the second dust removal unit 10 is communicated with the medium inlet of the secondary preheating unit 2; and a gas outlet of the first dust removal unit 9 is communicated with a gas inlet of the dust collection unit 11, and a liquid outlet of the dust collection unit 11 and a liquid outlet of the drying medium condensation unit 7 are respectively communicated with the porous calcium silicate washing unit. The dust collecting unit 11 is a water film type dust collector.
The waste gas collected by the second dust removal unit 10 can also be used as a drying medium of the secondary preheating unit 2 for continuous use, and the waste gas escapes from a gas outlet collected by the second dust removal unit 10 and enters the secondary preheating unit 2 through a medium inlet of the secondary preheating unit 2 to dry the primary drying porous calcium silicate. And all waste gas generated in the secondary preheating unit 2 escapes from a gas outlet of the first dust removal unit 9 and enters the dust collection unit 11 through a gas inlet of the dust collection unit 11, and dust-containing water can be introduced into the porous calcium silicate washing unit 12 after the dust collection unit 11 absorbs the waste gas, so that the porous calcium silicate is washed. In addition, the liquid outlet of the drying medium condensing unit 7 may be communicated with the porous calcium silicate washing unit 12, and the sublimated water may be collected for the washing operation of the porous calcium silicate. Wherein, the water in the dust collecting unit 11 can come from the third washing liquid of the filter.
It should be noted that the gas outlet of the second dust removing unit 10 is communicated with the medium inlet of the second preheating unit 2 to input the exhaust gas generated in the second dust removing unit 10 as a drying medium into the second preheating unit 2, the exhaust steam and the drying medium (steam or air flow) entering the second preheating unit 2 may enter the inlet of the second preheating unit 2 after being merged, or the exhaust steam and the drying medium (steam or air flow) enter the two inlets of the second preheating unit 2 respectively, and fig. 4 shows that the exhaust steam and the drying medium (steam or air flow) enter the two inlets of the second preheating unit 2 respectively.
Further, the primary preheating unit 1 may be a paddle dryer, the secondary preheating unit 2 may be a rotary kiln dryer or a shell-and-tube dryer, and the drying unit 3 may be a flash dryer.
When the porous calcium silicate drying device works in use, a porous calcium silicate material firstly enters a slurry dryer of the primary preheating unit 1, the material is pushed forwards by using a double-spiral structure of the slurry dryer, and meanwhile, the material is preheated and dried by using a drying medium in a spiral blade. Through primary preheating, a porous calcium silicate material (primary drying porous calcium silicate) with 10-15% of water loss enters a tube dryer or rotary kiln drying equipment of a secondary preheating unit 2, and secondary preheating is carried out on the primary drying porous calcium silicate by utilizing the low speed and large space of rotary equipment, so that the water loss of the porous calcium silicate material reaches 80-90%; the materials after two-stage preheating directly enter a flash dryer of the drying unit 3 for rapid drying, so that the materials are completely dried, wherein the waste gas of the second-stage drying, the dead steam and the waste gas of the third-stage drying are recycled, and the utilization rate of a heat source is fully realized.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (6)
1. A method of drying a porous calcium silicate material, comprising the steps of:
1) carrying out primary preheating on the porous calcium silicate material to obtain primary dried porous calcium silicate, wherein the water content of the primary dried porous calcium silicate is reduced by 10-15% compared with that of the porous calcium silicate material;
2) carrying out secondary preheating on the primary dried porous calcium silicate to obtain secondary dried porous calcium silicate, wherein the water content of the secondary dried porous calcium silicate is reduced by 80-90% compared with that of the porous calcium silicate material;
3) drying the secondary dried porous calcium silicate to obtain a porous calcium silicate product, wherein the water content of the porous calcium silicate product is lower than 5%;
wherein, the drying medium used for drying is obtained by heat exchange of cold fluid;
further comprising: performing exhaust steam-gas-liquid separation on exhaust steam generated after the primary preheating, the secondary preheating and the heat exchange, wherein gas obtained by the exhaust steam-gas-liquid separation is heated and then used as a heat medium to participate in the primary preheating, the secondary preheating and the heat exchange again, and liquid obtained by the exhaust steam-gas-liquid separation is used as a washing medium of the porous calcium silicate material;
sequentially carrying out first dust removal on the secondary dried porous calcium silicate, then carrying out drying, and carrying out second dust removal on the dried secondary dried porous calcium silicate to obtain a porous calcium silicate product;
and the waste gas obtained by the second dust removal is used as the heat medium for the secondary preheating.
2. The method for drying a porous calcium silicate material as claimed in claim 1, wherein the primary preheating is performed in step 1) by using a slurry dryer, wherein the drying medium in the slurry dryer is steam or air flow at 100-150 ℃.
3. The method for drying porous calcium silicate material as claimed in claim 1, wherein in the step 2), a rotary kiln type dryer or a tubular dryer is adopted for the secondary preheating, and the drying medium in the rotary kiln type dryer or the tubular dryer is steam or air flow at the temperature of 100 ℃ and 150 ℃.
4. The method for drying a porous calcium silicate material as claimed in claim 1, wherein in step 3), a flash dryer is used for drying, and the drying medium of the flash dryer is steam or air flow at the temperature of 100 ℃ and 150 ℃.
5. A drying device for porous calcium silicate materials is characterized by comprising a primary preheating unit, a secondary preheating unit, a drying unit and a product collecting unit;
the discharge port of the primary preheating unit is communicated with the feed port of the secondary preheating unit, the discharge port of the secondary preheating unit is communicated with the feed port of the drying unit, and the discharge port of the drying unit is communicated with the product collecting unit;
the primary preheating unit is used for preheating the porous calcium silicate material to obtain primary dried porous calcium silicate, and the water content of the primary dried porous calcium silicate is reduced by 10-15% compared with that of the porous calcium silicate material;
the secondary preheating unit is used for preheating the primary drying porous calcium silicate material to obtain secondary drying porous calcium silicate, and the water content of the secondary drying porous calcium silicate is reduced by 80-90% compared with that of the porous calcium silicate material;
the drying unit is used for drying the secondary dried porous calcium silicate material to obtain a porous calcium silicate product, and the water content of the porous calcium silicate product is lower than 5%;
a medium inlet of the drying unit is communicated with a medium outlet of the heat exchange unit;
the drying device also comprises a drying medium condensing unit and a heating unit;
the exhaust steam outlet of the primary preheating unit, the exhaust steam outlet of the secondary preheating unit and the exhaust steam outlet of the heat exchange unit are respectively communicated with the inlet of the drying medium condensation unit, the drying medium outlet of the drying medium condensation unit is communicated with the inlet of the heating unit, the outlet of the heating unit is respectively communicated with the medium inlet of the primary preheating unit, and the medium inlet of the secondary preheating unit is communicated with the medium inlet of the heat exchange unit;
the dust removal device also comprises a first dust removal unit and a second dust removal unit;
the first dust removal unit is arranged between the secondary preheating unit and the drying unit, a discharge hole of the secondary preheating unit is communicated with a feed hole of the first dust removal unit, and a discharge hole of the first dust removal unit is communicated with a feed hole of the drying unit;
the second dust removal unit is arranged between the drying unit and the product collection unit, a discharge hole of the drying unit is communicated with a feed hole of the second dust removal unit, and a discharge hole of the second dust removal unit is communicated with the product collection unit;
the gas outlet of the second dust removal unit is communicated with the medium inlet of the secondary preheating unit;
and a gas outlet of the first dust removal unit is communicated with a gas inlet of the dust collection unit, and a liquid outlet of the dust collection unit and a liquid outlet of the drying medium condensation unit are respectively communicated with the porous calcium silicate washing unit.
6. The drying device of porous calcium silicate material as claimed in claim 5, wherein the primary preheating unit is a paddle dryer, the secondary preheating unit is a rotary kiln dryer or a shell and tube dryer, and the drying unit is a flash dryer.
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| CN203683394U (en) * | 2013-11-05 | 2014-07-02 | 大唐国际发电股份有限公司高铝煤炭资源开发利用研发中心 | Silicon-calcium slag drying and alkalinity-reducing system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| DE19810565A1 (en) * | 1998-03-11 | 1999-09-16 | Basf Ag | Economical drying of microporous particles containing fluid e.g. inorganic, organic or polymer gel |
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| DE2818948C2 (en) * | 1977-05-13 | 1986-05-22 | KUBOTA, Ltd., Osaka | Method of drying and cooling a calcium silicate tabular body |
| CN101788221A (en) * | 2009-12-25 | 2010-07-28 | 山东天力干燥设备有限公司 | Novel silica gel energy-saving drying device and process thereof |
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