KR102109756B1 - manufacturing method of flue gas desulfurization base material and high quality desulfurization plaster by new shell grinding systems - Google Patents

Abstract

The present invention relates to a method for producing a flue gas desulfurization base material and high quality desulfurization plaster using a shell grinding system capable of more effectively pulverizing shells to produce a high quality flue gas desulfurization base material. The shell grinding system comprises: a supply hopper quantitatively supplying washed shells; a dryer drying the shells supplied through the supply hopper at a drying temperature of 250-350°C for 35-60 minutes; a crusher crushing the shells dried by the dryer to a size that is grindable in a grinder below; a sorting machine selecting shells having a predetermined size or more among the pieces of the crushed shells to send the selected pieces back to the crusher; a calciner heating and calcining the crushed shells at a calcination temperature of 500-800 °C for 70-100 minutes; a cooler cooling shell particles heated during calcining to room temperature; and a storage tank having an integrated grinder in which cooled shell pieces are grinded to a particle size of 100-1,500 mesh and a classifier filtering particles above the set particle size from grinded shell powder is included, a filter for powder collection, and a screw conveyor storing the shell powder and discharging products on one side installed.

Description

Shell manufacturing system for production of new flue gas desulfurization raw materials and high quality desulfurization gypsum production method using the same method {manufacturing method of flue gas desulfurization base material and high quality desulfurization plaster by new shell grinding systems}

The present invention relates to a shell crushing system for producing flue gas desulfurization raw materials and a method for producing high quality desulfurized gypsum using the same, and in detail, a shell crushing system for flue gas desulfurization raw material production that can more effectively pulverize shells to produce high quality desulfurized gypsum and uses the same It relates to a method for producing high-quality desulfurized gypsum.

In addition, the present invention relates to a shell crushing system for producing flue gas desulfurization raw materials and a high-quality desulfurization gypsum production method using the same to prevent pollution of the environment by preventing dust from being generated in the process of crushing the shell.

Shells (貝殼) are shellfish (貝類) shells. When shellfish is shipped, most of the contents are circulated after removal, and these shells are accumulated as waste in the vicinity of shells.

The shells accumulated in this way are the cause of environmental pollution.

Accordingly, various technologies for recycling shells have been developed, for example, Patent Documents 1 to 3.

Patent Document 1 is a step of removing salt by washing the oyster shell; Grinding the salt-removed oyster shell; A classification step of pulverizing the crushed oyster shell into a predetermined particle size; Oyster shell powder is burned at a temperature of 600 ℃ ~ 900 ℃ to remove carbon dioxide, so that quicklime (oxidation

Calcination step of producing calcium); Mixing step of mixing 40 to 60 parts by weight of quicklime, 4 to 20 parts by weight of fly ash, 5 to 20 parts by weight of gypsum, and 40 to 60 parts by weight of blast furnace slag; ,

Patent Document 2 is a coagulation composition for inorganic wastewater treatment consisting of 50-200 parts by weight of waste gypsum powder, 50-200 parts by weight of starfish powder, 50-100 parts by weight of shellfish powder, and 30-70 parts by weight of clay mineral,

Patent Document 3 includes a step of heat treating the oyster shell, preparing a slurry by crushing the heat treated oyster shell, a step of wet desulfurization by reacting the slurry with exhaust gas, and recovering the desulfurized gypsum precipitated during wet desulfurization, The heat treatment step is a method of producing high-quality desulfurization gypsum using oyster shells for wet desulfurization, which heat-treats the oyster shells at 800 to 1500 ° C. for 0.25 to 10 hours,

Patent Document 4 is a step of first firing for 20 to 30 minutes at a temperature of 1300 ~ 1500 ℃ by injecting raw materials such as water-treated shellfish and the like in a firing furnace; Pulverizing the first calcined raw material into a grinder; Separating the pulverized raw material powder by putting it in a separator; Putting the separated fine powder into a granulation molding granulator and molding it to granulate using hot water as a binder; A step of secondary firing for 10 to 20 minutes at a temperature of 900 to 1000 ° C. by introducing a molded granular feed into the firing furnace; After the second calcined granular feed is cooled, it is re-injected into the calcination furnace, and the third calcination is repeated at a temperature of 900 to 1000 ° C. for 10 to 20 minutes; And a step of sifting the granulated feed by inserting the granulated feed into a vibrating body.

As described above, various techniques for recycling shell shells have been developed, and in order to recycle shell shells, a shell pre-treatment technique is required, but the shell shell pre-treatment technique is insufficient to simply dry and crush shell shells.

In addition, there is a problem that the environment is polluted by dust generated in the process of grinding the shell.

Republic of Korea Registered Patent No. 10-0464666 Republic of Korea Registered Patent No. 10-1169563 Republic of Korea Registered Patent No. 10-1753823 Republic of Korea Registered Patent No. 10-0993223

The present invention was developed to solve the problems of the prior art as described above, the shell shell grinding system for producing flue gas desulfurization raw materials using a shell shell grinding system capable of pulverizing the shell more effectively to produce high-quality desulfurization material and high-grade desulfurization using the same It is an object to provide a method for producing gypsum.

In addition, the present invention provides a shell crushing system for producing flue gas desulfurization raw materials using a shell crushing system that prevents dust from being generated in the process of crushing shells and prevents the environment from being contaminated by dust, and a high-quality desulfurization gypsum production method using the same It aims to do.

Shell crushing system for producing flue gas desulfurization raw material according to the present invention for solving the above object is a supply hopper for quantitatively supplying the washed shell; Dryer for drying the shells supplied through the supply hopper at a drying temperature of 250 ~ 350 ℃ 35 ~ 60 minutes; A crusher to crush the shell dried by the dryer to a size that can be crushed in the following crusher; A sorting machine which selects a shell having a predetermined size or more among pieces of the shredded shell and sends it back to the crusher; A plasticizer heated and calcined at a calcination temperature of 500 to 800 ° C. for 70 to 100 minutes; A cooler that cools the shell particles heated in the plasticizing process to room temperature; An integrated grinder including a classifier for pulverizing the cooled shell pieces to a particle size of 100 to 1,500 mesh and filtering the crushed shell powder into particles having a particle size equal to or less than a set particle size; A collector for collecting powder; It is characterized in that it comprises a storage tank in which the shell powder is stored and a screw conveyor for discharging the product to one side is installed.

The dryer is a rotary type dryer, a rotary drying drum having a circular cylindrical shape and having a plurality of stirring buckets installed on an inner wall, a burner that heats the drying drum, and installed inside the drying drum, opposite to the drying drum. It includes a rotating shaft that rotates in the direction, and a plurality of stirring blades, and a driving motor, which rotates a driving wheel that pushes and rotates a driving ring installed on an outer circumferential surface of the drying drum.

The plasticizer rotates a rotating plastic wheel having a circular cylindrical shape and a plurality of stirring blades installed on an inner wall, a burner that heats the plastic drum, and a driving ring installed on an outer circumferential surface of the plastic drum to rotate. It includes a driving motor.

The cooler includes a cooling drum having a circular cylindrical shape and having a cooling water storage space on the wall, and a driving motor that rotates a driving wheel that pushes and rotates a driving ring installed on an outer circumferential surface of the plastic drum.

A transfer means is provided between each device, and a duct for collecting shell powders scattered in the process is provided at the upper part of the transfer means and each device, and a dust collector for collecting the collected powders is further provided.

The method for producing flue gas desulfurization raw materials and high-quality desulfurization gypsum using the shell grinding system according to the present invention is a method for producing desulfurized gypsum using shell powder produced by the system, wherein the shell powder is reacted with exhaust gas to wet desulfurization and wet desulfurization. And recovering the precipitated desulfurized gypsum.

The method for producing flue gas desulfurization raw materials and high-grade desulfurization gypsum using the shell crushing system according to the present invention has an effect of pulverizing the shell evenly to provide high-quality shell powder.

In addition, the present invention has the effect of preventing the shell shell powder generated in the process of crushing the shell shell from spreading around to prevent the environment from being polluted by the shell shell powder.

In addition, there is an effect that can provide more excellent desulfurized gypsum by using a high-quality crushed shell powder.

1 is a block diagram of a shell crushing system according to the present invention,
Figure 2 is a side view of the dryer constituting the shell crushing system according to the present invention
Figure 3 is a longitudinal sectional view of the dryer constituting the shell crushing system according to the present invention
Figure 4 is a side view of the plasticizer constituting the shell crushing system according to the present invention
Figure 5 is a longitudinal cross-sectional view of the plasticizer constituting the shell crushing system according to the present invention
Figure 6 is a side view of the cooler constituting the shell crushing system according to the present invention
7 is a longitudinal sectional view of a crusher constituting a shell crushing system according to the present invention
Figure 8 is a process diagram of manufacturing shell pulverized powder made using the shell crushing system according to the present invention

The present invention can be applied to various changes and can have various embodiments, and specific embodiments are illustrated in the drawings and will be described through detailed description. However, this is not intended to limit the present invention to specific embodiments, and should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention.

In describing each drawing, similar reference numerals are used for similar components. In the description of the present invention, if it is determined that a detailed description of known technologies related to the present invention may obscure the subject matter of the present invention, the detailed description will be omitted.

The present invention can more effectively crush the shell to produce a high-quality flue gas desulfurization raw material.

Shell crushing system according to the present invention, as shown in Figure 1, the supply hopper 10 for quantitatively supplying the washed shell; Dryer 20 for drying the shells supplied through the supply hopper at a drying temperature of 250 ~ 350 ℃ 35 ~ 60 minutes; A crusher 30 for crushing the shell dried by the dryer to a size that can be crushed in the following crusher; A sorter 40 for sorting shells of a predetermined size or more and sending them back to the shredder; A plasticizer 50 for heating and calcining at a calcination temperature of 500 to 800 ° C. for 70 to 100 minutes; Cooler 60 for cooling the shell particles heated in the plasticizing process to room temperature; Crusher 70 for crushing the cooled shell pieces to a particle size of 100 ~ 1,500 mesh; A collector 80 for filtering particles having a particle size or less from the ground shell powder; And a storage tank 90 in which the shell powder is stored and a screw conveyor 91 for discharging the product is installed on one side.

The supply hopper 10 is transported from the outside, and is supplied to transport the shells washed through the washing process to a subsequent process.

The shell discharged from the supply hopper 10 is supplied to the dryer 20.

The dryer 20 is for drying the water on the shell, it is preferable to use a rotary dryer as shown, it is preferable to install the slant while making an exit from the inlet to which the shell is supplied as shown Do.

The angle at which the dryer 20 is inclined may vary depending on the size of the dryer and the amount of shells to be processed, but if the treatment capacity is 6 tons per hour, the diameter of the drying drum is 2 m and the length is 15 m to 25 m, the slope is 2.5 °. Is preferably,

The dryer 20 can be implemented by various modifications, but a preferred example for increasing the drying efficiency is a rotating type having a plurality of stirring buckets 21b installed on an inner wall and having a circular cylindrical shape as shown in FIG. 3. A rotating drum (21), a burner (22) that heats the inside of the drying drum, and a rotating shaft (installed inside the drying drum) that rotates in the opposite direction to the drying drum and has a plurality of stirring blades (23w) installed on its outer circumferential surface ( 23) and a driving motor 24 that rotates a driving wheel 24w that pushes and rotates a driving ring 21d installed on an outer circumferential surface of the drying drum.

The drying drum 21 is a cylindrical cylinder, and is installed inclined, and a hopper is installed in a relatively high place so that the shell that has been transported can be easily introduced into the inside, and the burner 22 is installed at one end.

A plurality of stirring buckets 21b are installed on the inner wall of the drying drum 21 as described above, and the stirring buckets 21b have a shape of a spatula with a receiving space formed on one side as installed in a conventional bucket conveyor. It is formed, and the receiving space is formed in the rotational direction of the drying drum so that the shell can be raised while the drying drum rotates.

The burner 22 is for supplying heat to the interior of the drying drum, and various fuels can be used, but it is preferable to use fuel that can minimize the generation of soot or foreign substances during combustion. Is used as a raw material.

A rotating shaft 23 is further installed inside the drying drum 21, and the rotating shaft rotates in the opposite direction to the drying drum.

2, a plurality of stirring blades 23w are formed on the outer circumferential surface of the rotating shaft 23. The stirring blade (23w) of the rotating shaft serves to stir the shell to be dried, and the effect of stirring the shell while moving in the opposite direction to the stirring bucket installed on the drying drum is increased to increase the drying efficiency of the shell.

A driving ring 21d is installed on the outer circumferential surface of the drying drum 21, and a driving wheel 24w that rotates the driving ring by pushing it to one side is installed on one side of the drying drum, and the driving wheel 24 ).

That is, when the driving motor is operated, the driving wheel rotates and the drying drum rotates by rotating the driving ring installed to contact the outer peripheral surface of the driving wheel.

In addition, it is preferable to install at least one guide ring (21g) guided by a guide roller to support the drying drum to stably rotate on the outer circumferential surface of the drying drum.

The shell dried by the dryer is crushed by the crusher 30.

The crusher 30 is for crushing to a relatively small size so that crushing can be easily performed in the pulverizer 70 at the rear end, and can be variously modified, but preferably using a hammer hammer (HAMMER CRUSHER) will be.

The shells crushed by the crusher are filtered by a sorter 40 or more and supplied to the crusher again, and only the shells having a size or smaller are discharged to the subsequent plasticizer 50.

That is, the sorter 40 discharges only the shell having a size sufficient to be crushed in a subsequent grinder to the plasticizer, and filters the shell having a size greater than that to be sent back to the crusher.

 The plasticizer 50 functions to remove volatile substances remaining in the shell and heats them to be more easily crushed in a crusher, which may be modified in various ways, but a preferred example is a rotary kiln method. will be.

In the plasticizer 50, when the calcination temperature is less than 500 ° C. or when the treatment is performed at 500 ° C. for less than 5 hours, organic substances are not completely removed, and crushability is not good, and thus there are many difficulties in producing high-quality flue gas desulfurization raw materials. If the shell is not crushed or a shell crushed into large and coarse grains is used, it is preferred that the reaction time is long, so that the efficiency of wet desulfurization is reduced, and the purity of the desulfurization gypsum may be lowered.

As an example of the plasticizer 50, as shown in FIGS. 4 and 5, a rotary plastic drum 51 having a circular cylindrical shape and a plurality of stirring blades 51w installed on an inner wall, and the plastic drum It comprises a burner 52 for applying heat, and a driving motor 53 for rotating the driving wheel 53w for rotating the driving ring 51d installed on the outer circumferential surface of the plastic drum.

The plastic drum 51 is a cylindrical cylinder, and is installed inclined, and a hopper is installed at a relatively high place so that the shell that has been transported can be easily introduced therein, and the burner 52 is installed at one end.

The burner 52 is for supplying heat to the interior of the drying drum, and various fuels can be used, but it is preferable to use fuel that can minimize the generation of soot or foreign substances during combustion. Is used as a raw material.

A driving ring 51d is installed on the outer circumferential surface of the plastic drum 51, and a driving wheel 53w for rotating the driving ring by pushing it to one side is installed on one side of the drying drum, and the driving wheel is a driving motor 53 ).

That is, when the driving motor is operated, the driving wheel rotates and the drying drum rotates by rotating the driving ring installed to contact the outer peripheral surface of the driving wheel.

In addition, it is preferable to install at least one guide ring (51g) guided by a guide roller to support the drying drum to stably rotate on the outer peripheral surface of the drying drum.

The shell fired by the plasticizer is cooled by the cooler 60.

As shown in FIG. 6, the cooler 60 forms a circular cylindrical shape and pushes the cooling drum 61 having a cooling water storage space 61a formed on the wall and a driving ring 61d installed on the outer circumferential surface of the plastic drum. And a driving motor 62 for rotating the driving wheel 62w to rotate.

The cooling drum 61 has a circular cylindrical shape, and is formed of a double wall to form a cooling water storage space 61a, and a plurality of stirring blades may be further formed on the inner wall.

Of course, a driving ring 61d is installed on the outer circumferential surface of the cooling drum 61, and a driving wheel 62w that pushes and rotates the driving ring to one side is installed on one side of the drying drum, and this driving wheel is a driving motor. It rotates by driving (62).

In addition, it is preferable to install at least one guide ring 61g guided by a guide roller supporting the cooling drum to stably rotate on the outer circumferential surface of the cooling drum.

The shell shell cooled in the cooler 60 is supplied to the grinder 70 and crushed to a desired particle size.

The grinder 70 may be implemented by various modifications, but is preferably made of a high-speed roller mill, for example, a plurality of grinding rollers inside the fixed grinding drum 71, as shown in FIG. It is configured by installing (72).

As shown in FIG. 7, the crushing rollers 72 are installed with the outer circumferential surfaces in contact with each other, thereby crushing them by pressing a shell supplied between them. Of course, a groove for grinding is formed on the outer peripheral surface of the grinding roller.

In addition, the grinder 70 is provided with a temporary storage tank (70t) thereon to temporarily store the shells transferred from the cooler of the previous stage, and one side of the temporary storage tank is provided with a dispersant tank (70d) to be crushed Dispersing agent could be supplied to the shell, and a classifier (70c) was provided on the inside of the grinder to classify the shell crushed products having a desired particle size and send them to a subsequent process.

The shell powder classified by the integrated grinder is supplied to the collector 80 to filter the shell powder.

The collector 80 can use a variety of things, but is preferably configured as a bag filter (BAG FILTER) to walk the fine shell powder.

Shell powder of a desired particle size filtered by the collector is stored in the storage tank (90).

The storage tank 90 has a screw conveyor 91 on one lower side, as shown as a tank for storing the shell powder that has been processed, so that the discharged shell powder can be quantitatively discharged.

The shell crushing system of the present invention configured as described above is provided with conveying means (C1 to C4, Vc1 to Vc2) between the respective devices, and a duct for collecting shell shell powder scattered during the process in the upper part of the conveying means and each device It is further provided with a dust collector (Dc) for collecting the collected fine powder and a scrubber (Sc) for adsorbing harmful gases.

Among the transfer means, C1 to C4 are belt conveyors, and Vc1 to Vc2 are bucket conveyors.

Among the collectors (Sc, Dc), Sc is a scrubber (SCRUBBER) that adsorbs the generated GAS, and Dc is a dust collector (DUST COLLECTOR).

Hereinafter, a method for producing desulfurized gypsum using shell powder formed using the waste shell grinding system of the present invention configured as described above will be described.

Desulfurization gypsum production method of the present invention comprises the steps of wet desulfurization by reacting the powder with the exhaust gas; And recovering the desulfurized gypsum precipitated during wet desulfurization.

The wet desulfurization may be achieved by aeration of exhaust gas containing sulfite gas to water containing shell powder in which water is mixed with shell powder.

That is, in the process for producing desulfurized gypsum of the present invention, sulfur dioxide is obtained by reacting sulfurous acid gas in the exhaust gas with water in an absorption tower that absorbs exhaust gas in the process of treating exhaust gas discharged from a thermal power plant, to obtain sulfurous acid in the shell powder. After reacting with the limestone contained, calcium sulfite is produced. After the calcium sulfite is classified into gypsum and sulfuric acid by reacting with oxygen and water, sulfuric acid is reacted with the limestone powder again to generate gypsum.

10: Supply hopper
20: dryer
21: Drying drum 21b: Stirring bucket 21d: Driving ring
21g: guide ring
22: burner
23: rotating shaft 23w: stirring blade
24: drive motor 24w:: drive wheel
30: Crusher
40: sorter
50: plasticizer
51: plastic drum 51w: stirring blade 51d: drive ring
51g: Guide ring
52: burner
53: drive motor 53w: drive 횔
60: cooler
61: cooling drum 61a: cooling water storage space
62: drive motor 62w: drive 횔 61d: drive ring
61g: Guide ring
70: grinder
70t: temporary storage tank 70d: dispersant tank 70c: classifier
71: grinding drum 72: rotary roller
80: collector
90: storage tank
91: Screw conveyor
100: controller
Sc: Scrubber
Dc: dust collector
C1 ~ C4: Belt conveyor
Vc1 ~ Vc2: Bucket conveyor

Claims (6)

Supply hopper 10 for quantitatively supplying the washed shell;
Dryer 20 for drying the shells supplied through the supply hopper at a drying temperature of 250 ~ 350 ℃ 35 ~ 60 minutes;
A crusher 30 for crushing the shell dried by the dryer to a size that can be crushed in the following crusher;
A sorter 40 for sorting shells of a predetermined size or more among shredded shell pieces and sending them back to the shredder;
A plasticizer 50 for heating and calcining at a plasticizing temperature of 500 to 800 ° C. for 70 to 100 minutes;
Cooler 60 for cooling the shell particles heated in the plasticizing process to room temperature;
An integrated grinder 70 with a classifier for pulverizing the cooled shell pieces to a particle size of 100 to 1,500 mesh and filtering the crushed shell powder into particles having a particle size equal to or greater than a set particle size; A collector 80 for collecting the classified powder; And a storage tank 90 in which a shell conveyor powder is stored and a screw conveyor 91 for discharging the product is installed,
The dryer 20 is a rotary dryer,
A rotary drying drum 21 having a circular cylindrical shape and a plurality of stirring buckets 21b installed on an inner wall,
A burner (22) for applying heat to the inside of the drying drum,
A rotating shaft 23 installed inside the drying drum, rotating in the opposite direction to the drying drum, and having a plurality of stirring blades 23w installed on an outer circumferential surface,
Shell grinding system for flue gas desulfurization raw material production, characterized in that it comprises a drive motor (24) for rotating the drive wheel (24w) to rotate by pushing the drive ring (21d) installed on the outer peripheral surface of the drying drum. delete According to claim 1,
The plasticizer 50 is a rotary plastic drum 51 having a circular cylindrical shape and a plurality of stirring blades 51w installed on an inner wall,
A burner (52) for applying heat to the inside of the plastic drum,
Shell grinding system for flue gas desulfurization raw material production, characterized in that it comprises a drive motor (53) for rotating the driving wheel (53w) to rotate by pushing the driving ring (51d) installed on the outer peripheral surface of the plastic drum. According to claim 1,
The cooler 60 has a cooling drum 61 having a circular cylindrical shape and a cooling water storage space 61a formed on a wall,
Shell grinding system for flue gas desulfurization raw material production, characterized in that it comprises a driving motor (62w) for rotating the driving wheel (62w) to rotate by pushing the driving ring (61d) installed on the outer peripheral surface of the plastic drum. According to claim 1,
It is provided with a conveying means between each device, the upper part of the conveying means and each device is provided with a duct for collecting shell powder scattered in the process, and further comprising a dust collector for collecting the collected powder. Shell grinding system for the production of desulfurization raw materials A method for producing desulfurized gypsum using shell powder made of any one of claims 1 and 3 to 5, wherein the powder is reacted with exhaust gas to wet desulfurization and
Method for producing high-quality desulfurization gypsum using shell powder produced using a shell crushing system comprising the step of recovering the precipitated desulfurization gypsum during wet desulfurization.

Images