Adsorbent for absorbing moisture

Abstract

The present invention relates to an adsorbent which absorbs moisture from the surrounding environment and adsorbs dust such as fine particles. The adsorbent according to one embodiment of the present invention absorbs moisture from the surrounding environment and adsorbs dust, and may be an adsorbent containing aluminum hydroxide (Al(OH)3) that absorbs the moisture as an active ingredient.

Description

moisture absorbent

[0001] The present invention relates to an adsorbent that prevents condensation occurring in the pores of a dust collecting filter and clogging of the pores of the dust collecting filter by dust or the like that binds thereto, and to a dust collecting filter including the same.

[0002] A dust collector is installed in a workplace where a lot of dust is generated to prevent air pollution caused by dust by capturing dust floating in the air and discharging only clean air to the outside.

[0003] Most dust collectors utilize bag-type filters to capture dust. These filters (also known as dust collectors, chamber bags, bag filters, or filter cloths) utilize thin paper or fibers to trap dust within the pores between fibers. These filters are primarily used in on-site environments where large, dry dust particles are generated, such as cement plants, feed mills, chemical plants, plastic factories, and woodworking plants.

[0004] The gas containing dust, dirt, etc. that passes through the bag filter dust collector is mainly hot air of 150℃ or higher, so the temperature difference from room temperature causes water vapor to turn into water droplets and form condensation on the dust collector filter. The water droplets then coalesce with dust, etc., accelerating the phenomenon of blocking the pores of the dust collector filter. Since the pores of the dust collector filter become clogged, there is the problem of having to replace the filter periodically.

[0005] To solve this problem, a prior art patent application No. 10-2326757 relates to a bag filter dust collector in which a secondary moisture remover is installed in the dust collector and the air passing through the moisture remover passes through a moisture detection unit before being supplied to a pressure tank, so that when moisture is detected, the air passes through the second moisture remover, and a patent application No. 10-1562926 relates to a dust collector for dedusting and drying a bag filter in which a cover having an openable structure is formed on the upper outlet side of the bag filter, and warm dry air is supplied to the hollow part of the bag filter together with compressed air through the cover to prevent dust from sticking to the surface of the bag filter due to moisture, but there is a disadvantage in that additional equipment is required for the dust collector.

[0006] Currently, there is no widespread technology for reducing waste generation by extending the lifespan of dust collection filters (dust collection cloth, chamber bag, bag filter, or filter cloth).

[0007] The present invention is intended to solve the above-mentioned problems, and relates to an environmentally friendly adsorbent in which aluminum hydroxide in powder form absorbs moisture to first prevent condensation occurring in a dust collecting filter, and gel-type aluminum hydroxide that has absorbed moisture secondarily adsorbs foreign substances such as dust fixed around the dust collecting filter, thereby maintaining dust and dirt removal efficiency without replacing the dust collecting filter.

[0008] Accordingly, the problem to be solved by the present invention is to provide an adsorbent for a dust collector that absorbs moisture from the surrounding environment and then adsorbs dust, etc.

[0009] Other objects and advantages of the present invention will become more apparent from the detailed description, claims and drawings below.

[0010] An adsorbent according to one embodiment of the present invention for achieving the above-described problem may be an adsorbent including aluminum hydroxide (Al(OH)3) as an active ingredient that absorbs moisture and then adsorbs dust.

[0011] In an adsorbent according to an exemplary embodiment of the present invention, the aluminum hydroxide may be included in a powder form.

[0012] In an adsorbent according to an exemplary embodiment of the present invention, when the aluminum hydroxide absorbs moisture, the aluminum hydroxide may change from a powder form to a gel form.

[0013] In an adsorbent according to an exemplary embodiment of the present invention, when the aluminum hydroxide is in the form of an aluminum hydroxide gel in a gel form, the aluminum hydroxide gel can adsorb the dust.

[0014] In an adsorbent according to an exemplary embodiment of the present invention, the adsorbent may further include magnesium silicate.

[0015] In an adsorbent according to an exemplary embodiment of the present invention, the adsorbent may further include silica fume.

[0016] In an adsorbent according to an exemplary embodiment of the present invention, the adsorbent may further include slaked lime.

[0017] According to one embodiment of the present invention, a dust collecting device for achieving the above-described problem can use the above-described adsorbent in a dust collecting filter.

[0018] A dust collecting filter according to an exemplary embodiment of the present invention may be a dust collecting filter including an adsorbent for a dust collecting filter that absorbs moisture from the surrounding environment and then adsorbs dust.

[0019] In a dust collecting filter according to one embodiment of the present invention, the adsorbent includes aluminum hydroxide (Al(OH)3) in powder form that absorbs moisture as an active ingredient, and the aluminum hydroxide may be included in an amount of 5 to 100 wt% based on 100 wt% of the total adsorbent.

[0020] The present invention provides an adsorbent that eliminates the phenomenon of pore clogging of a dust collecting filter caused by high-temperature gas containing dust, etc. flowing into a dust collector, and maintains dust removal efficiency without replacing the dust collecting filter, so that it can be beneficially used in atmospheric environment facilities and prevents environmental pollution caused by a filter being replaced.

[0021] The advantages and features of the present invention, and the methods for achieving them, will become clear with reference to the embodiments described in detail below together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various different forms. These embodiments are provided only to ensure that the disclosure of the present invention is complete and to fully inform those skilled in the art of the scope of the invention, and the present invention is defined only by the scope of the claims. Specific details for implementing the present invention will be described in detail with reference to the attached drawings. Regardless of the drawings, the same reference numerals refer to the same components, and "and / or" includes each and all combinations of one or more of the mentioned items.

[0022] The terminology used herein is for the purpose of describing embodiments and is not intended to limit the present invention. In this specification, singular forms also include plural forms, unless specifically stated otherwise. As used herein, the terms "comprises" and / or "comprising" do not exclude the presence or addition of one or more other components in addition to the components mentioned.

[0023] Unless otherwise defined, all terms (including technical and scientific terms) used herein may be used in their common sense to those of ordinary skill in the art to which the present invention pertains. Furthermore, terms defined in commonly used dictionaries are not to be interpreted ideally or excessively unless explicitly and specifically defined otherwise.

[0024] Hereinafter, an adsorbent according to one embodiment of the present invention will be described.

[0025] The adsorbent of the present invention is an adsorbent for a dust collecting filter.

[0026] A dust collector filter (dust collecting cloth, chamber bag, bag filter, or filter cloth) used in a dust collector to remove dust and pollutants in the air is made of thin paper or fiber, and is used in a dust collector based on the principle of attaching dust to the gaps between fiber threads.

[0027] However, since the gas passing through the dust collector is mainly hot air of 150℃ or higher, the temperature difference with room temperature causes water vapor to turn into water droplets and form condensation on the filter, which accelerates the phenomenon of blocking the pores of the dust collector filter by adhering to dust, etc. Since the phenomenon of blocking the pores of the dust collector filter reduces the dust collection efficiency, the dust collector filter must be replaced periodically. When the differential pressure of the dust collector reaches 180 to 200 mmH2O, the dust collector filter should be prepared for replacement, and from about 150 mmH2O, the dust removal efficiency drops significantly.

[0028] The inventors of the present invention applied several candidate substances to dust collection equipment to solve the problem of environmental pollution caused by the frequent replacement cycle of dust collection filters, but most of them showed effects only for a short period of time, resulting in the problem of having to replace dust collection filters periodically.

[0029] However, it was confirmed that when the adsorbent of the present invention is applied, the pressure of the pressure regulator is maintained at a level of about 60 to 110 mmH2O, so that the dust collection efficiency is maintained without replacing the dust collection filter, thereby solving the problem of environmental pollution caused by frequent replacement of the dust collection filter.

[0030] The present invention relates to an adsorbent that absorbs moisture from the surrounding environment and then adsorbs dust, and is an adsorbent for a dust collecting filter, characterized in that the adsorbent comprises aluminum hydroxide (Al(OH)3) that absorbs the moisture as an active ingredient. The adsorbent of the present invention primarily prevents moisture generated by the inflow of hot air from a dust collector. This prevents moisture and dust from entangled and sticking to the dust collecting filter. To this end, the adsorbent may contain aluminum hydroxide (Al(OH)3) that absorbs the moisture in a powder form.

[0031] Aluminum hydroxide exists in powder form at room temperature. For reference, aluminum hydroxide can be manufactured using bauxite as a raw material using the Bayer method. Aluminum hydroxide remains stable up to approximately 200°C, and at higher temperatures, it can be separated into water and alumina through thermal decomposition. Meanwhile, when reacting with strong acids or strong alkalis, it can generate aluminous acid, hydrochloric acid, etc. In addition, aluminum hydroxide can be hydrophilic because it contains a hydroxyl (-OH) group. Therefore, when aluminum hydroxide comes into contact with surrounding moisture, it can combine with the moisture and absorb it.

[0032] When the above aluminum hydroxide absorbs the moisture, the aluminum hydroxide can change from a powder form to a gel form. When the aluminum hydroxide absorbs moisture, it changes from a powder form to a gel form, called aluminum hydroxide gel.

[0033] Aluminum hydroxide in a gel state can adsorb surrounding dust and foreign substances. For example, when the adsorbent of the present invention is installed in the filter of a dust collector, dust contained in exhaust gas passing through the dust collector can be adsorbed and captured by the aluminum hydroxide gel. The aluminum hydroxide gel to which dust, etc. are adsorbed is detached by the pulsing function of the dust collector, thereby resolving the phenomenon of pore clogging in the filter. In summary, the adsorbent according to an embodiment of the present invention is suitable for a bag filter dust collector because it removes moisture contained in the exhaust gas and then gels to remove dust.

[0034] The adsorbent of the present invention may further include, depending on the intended use, lime when purifying air with a high heavy metal content, silica fume when purifying air with a high moisture content, and an adsorption aid such as magnesium silicate to improve adsorption capacity.

[0035] Even if a small amount of powdered aluminum hydroxide is included, it can perform the moisture removal function of the present invention by increasing the dosage, and then it becomes gelated to remove dust, so that the effect of using the dust collecting filter for a long period of time without replacement can be achieved.

[0036] In the adsorbent according to an embodiment of the present invention, aluminum hydroxide may be included in an amount of 5 to 100 wt% based on 100 wt% of the total adsorbent, and is not limited to the weight ratio of aluminum hydroxide according to the embodiment.

[0037] If the aluminum hydroxide content is less than 5% by weight, the moisture absorption effect of the adsorbent may be reduced. Furthermore, it may be difficult for the aluminum hydroxide to gel. Furthermore, the dust adsorption capacity of the gel-type aluminum hydroxide may also be reduced. When the aluminum hydroxide content is 5% by weight or more, gelation due to moisture absorption occurs, creating conditions for the adsorbent. When used at 100% by weight, the adsorbent's dust adsorption is effective.

[0038] Continuing, the adsorbent according to one embodiment of the present invention may further include magnesium silicate to enhance adsorption performance. Magnesium silicate can be produced by synthesizing silicate and magnesium salt. Magnesium silicate can function as an adsorption aid in the adsorbent. That is, when dust or the like is adsorbed onto gel-type aluminum hydroxide, the magnesium silicate can facilitate the adsorption of the dust onto the aluminum hydroxide. This can enhance the adsorption performance of the adsorbent for dust.

[0039] Meanwhile, in the adsorbent according to an embodiment of the present invention, magnesium silicate may be included in an amount of 0.1 to 95 wt% based on 100 wt% of the entire mixture. Preferably, magnesium silicate may be included in an amount of 0.1 to 35 wt% based on 100 wt% of the entire mixture. If the content of magnesium silicate is less than 0.1 wt%, it may be difficult to expect an adsorption improvement effect of the adsorbent. If the content of magnesium silicate exceeds 35 wt%, the content of other components included in the mixture may decrease, resulting in a decrease in the adsorption or moisture absorption performance of the adsorbent as a whole.

[0040] Continuing, the adsorbent according to one embodiment of the present invention may further comprise silica fume to enhance moisture absorption performance. Silica fume may be used in combination with aluminum hydroxide and magnesium silicate, or may be used alone. The composition of the mixture of aluminum hydroxide, magnesium silicate, and silica fume may be adjusted depending on the intended use and efficacy.

[0041] Silica fume can function as a moisture absorption aid or preservative in adsorbents. That is, when moisture or other substances are absorbed by powdered aluminum hydroxide, silica fume can additionally absorb any remaining moisture in the surroundings. This can enhance the moisture absorption performance of the adsorbent.

[0042] Meanwhile, in the adsorbent according to an embodiment of the present invention, silica fume may be included in an amount of 0.1 to 95 wt% based on 100 wt% of the entire mixture. Preferably, silica fume may be included in an amount of 0.1 to 35 wt% based on 100 wt% of the entire mixture. If the content of silica fume is less than 0.1 wt%, it may be difficult to expect additional moisture absorption effect of the adsorbent. In addition, it may be difficult to expect a preservative effect for the adsorbent. If the content of silica fume exceeds 35 wt%, the content of other components included in the mixture may be reduced, which may lower the overall adsorption or moisture absorption performance of the adsorbent.

[0043] Continuing, the mixture included in the adsorbent according to one embodiment of the present invention may further include slaked lime to enhance the heavy metal and toxic gas removal efficacy. Slaked lime functions as an adsorption aid in the adsorbent, and particularly, it can adsorb heavy metals and toxic gases, thereby removing them from exhaust gas. Specifically, when dust or the like is adsorbed onto the gel-type aluminum hydroxide, the slaked lime can also promote the adsorption of heavy metals and toxic gases, thereby further contributing to the purification of exhaust gas. In other words, the overall adsorption performance of the adsorbent can be enhanced.

[0044] Meanwhile, in the adsorbent according to an embodiment of the present invention, slaked lime may be included in an amount of 0.1 to 95 wt% based on 100 wt% of the entire mixture. Preferably, slaked lime may be included in an amount of 0.1 to 35 wt% based on 100 wt% of the entire mixture. If the content of slaked lime is less than 0.1 wt%, it may be difficult to expect the adsorbent to have an adsorption and removal effect for heavy metals and harmful gases. If the content of slaked lime exceeds 35 wt%, the content of other components included in the mixture may decrease, which may lower the overall dust adsorption or moisture absorption performance of the adsorbent.

[0045]

[0046] Meanwhile, the adsorbent according to the above-described embodiment of the present invention can be used as a filter in a dust collector. For example, the adsorbent of the present invention can be used in the filter of a dust collector in a factory where exhaust gas is generated. By constructing a facility in which the adsorbent can be settled in the exhaust gas path and installing the adsorbent within the facility, moisture, dust, harmful gases, etc. contained in the exhaust gas can be removed.

[0047] Hereinafter, the present invention will be described in more detail through examples. However, these examples are intended to exemplify the present invention and the scope of the present invention is not limited to these examples.

[0048] Example: Preparation of adsorbent

[0049] An adsorbent was prepared based on the ingredients and compositions in Table 1 below. Aluminum hydroxide, magnesium silicate, silica fume, and slaked lime were prepared in powder form. The adsorbent of the present invention was prepared according to the ingredient compositions of Examples 1 to 4. The powders of each ingredient were prepared so that they could be mixed relatively uniformly using a mixing mixer.

[0050] More specifically, Example 1 produced an adsorbent by mixing 5 g of aluminum hydroxide [Kanto, Japan] and 95 g of magnesium silicate [Junsei, Japan], Example 2 produced an adsorbent by mixing 30 g of aluminum hydroxide [Kanto, Japan], 35 g of magnesium silicate [Junsei, Japan], and 35 g of silica fume [Junsei, Japan], Example 3 produced an adsorbent by mixing 90 g of aluminum hydroxide [Kanto, Japan] and 10 g of silica fume [Junsei, Japan], Example 4 produced an adsorbent by mixing 90 g of aluminum hydroxide [Kanto, Japan] and 10 g of slaked lime [Junsei, Japan], and Example 5 produced an adsorbent using only 100 g of aluminum hydroxide [Kanto, Japan].

[0051] On the other hand, Comparative Example 1 produced an adsorbent by mixing 4 g of aluminum hydroxide [Kanto, Japan] and 96 g of magnesium silicate [Junsei, Japan], Comparative Example 2 produced an adsorbent by mixing 4 g of aluminum hydroxide [Kanto, Japan], 48 g of magnesium silicate [Junsei, Japan], and 48 g of silica fume [Junsei, Japan], and Comparative Example 3 produced an adsorbent by mixing 4 g of aluminum hydroxide [Kanto, Japan] and 96 g of slaked lime [Junsei, Japan]. The adsorbent composed of the mixed mixture was stored in a nonwoven fabric, sealed, and packaged, thereby completing the production of the adsorbent.

[0052]

[0053] Test Example 1: Moisture and Dust (Fine Dust) Removal Efficacy

[0054] The adsorbents of Examples 1 to 5 and Comparative Examples 1 to 3 were tested for their moisture absorption capacity and dust (fine dust) removal capacity. The exhaust gas prepared for the test contained 90% humidity and fine dust. A reactor was manufactured for the test. The reactor was a cylindrical reactor made of SUS 316 with an inner diameter of 150 mm and a height of 300 mm. A storage space was provided on one side of the reactor to accommodate the adsorbent, and the adsorbents of Examples 1 to 5 and Comparative Examples 1 to 3 were stored in the space for each test. Meanwhile, a jacket-type heater was installed outside the reactor to enable temperature control within the reactor and maintain the reactor temperature at a constant 25°C.

[0055] The exhaust gas containing 90% moisture and fine dust (0.001 to 0.1 μm) was continuously injected into the reactor at a constant flow rate of 10 cc / min. The concentration of fine dust (injection concentration in the reactor: 4.5 mg / Nm) was measured using a fine dust measuring device (Electrical Low pressure Impactor with a sampling system). The results of removing moisture and fine dust contained in the exhaust gas by Examples 1 to 5 and Comparative Examples 1 to 3 before and after each of Examples 1 to 5 and Comparative Examples 1 to 3 came into contact with the exhaust gas in the reactor are shown in Table 2 below.

[0056]

[0057] As can be seen from the results in Table 2, the adsorbents according to the embodiments of the present invention were found to be excellent in moisture removal and fine dust (particulate matter) removal. Furthermore, the adsorbents according to the embodiments of the present invention were found to have excellent gelation properties. As the gelation properties improved, the adsorbents were found to be excellent in fine dust (particulate matter) adsorption.

[0058] Test Example 2: Moisture and Harmful Gas (Hydrogen Chloride Gas) Removal Efficacy

[0059] The adsorbents of Examples 1 to 5 and Comparative Examples 1 to 3 were tested for their moisture absorption capacity and harmful gas (hydrogen chloride gas) removal capacity. The exhaust gas prepared for the test contained 90% humidity and controlled hydrogen chloride gas. The reactor used was identical to the reactor of Test Example 1.

[0060] The exhaust gas containing 90% moisture and chloride gas was continuously injected into the reactor at a constant flow rate of 10 cc / min. Hydrogen chloride (HCl) was used as a standard gas (Riga Gas, Korea) manufactured at 4,998 mmol / mol / N2 balance. The gas flowing out of the reactor outlet was captured in a Tedlar bag for 3 minutes and measured using a detector tube (Kitagawa, 109SA, Japan) to confirm the adsorption performance of the adsorbent. The adsorption performance (L / L) was expressed as the amount of gas adsorbed per liter of the adsorbent.

[0061] The results of removing moisture and fine dust contained in the exhaust gas by Examples 1 to 5 and Comparative Examples 1 to 3 before / after contact with the exhaust gas in the reactor are shown in Table 3 below.

[0062]

[0063] As can be seen from the results in Table 3, the adsorbents according to the embodiments of the present invention were found to be excellent in moisture removal and harmful gas (hydrogen chloride gas) removal. In addition, the adsorbents according to the embodiments of the present invention were found to have excellent gelation properties.

[0064] While the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, but can be manufactured in various different forms. Those skilled in the art will understand that the present invention can be implemented in other specific forms without altering the technical spirit or essential characteristics of the present invention. Therefore, the embodiments described above should be understood to be illustrative in all respects and not restrictive.

Claims

1. A dust collecting filter including an adsorbent for a dust collecting filter that absorbs moisture from the surrounding environment and then adsorbs dust. The above adsorbent is, A dust collecting filter including an adsorbent, characterized in that it contains aluminum hydroxide (Al(OH)3) in powder form that absorbs moisture as an active ingredient, and the aluminum hydroxide is contained in an amount of 5 to 100 wt% with respect to the total 100 wt% of the adsorbent.

2. In paragraph 1, A dust collecting filter including an adsorbent, characterized in that when the aluminum hydroxide absorbs moisture, the aluminum hydroxide changes from a powder form to a gel form.

3. In paragraph 2, When the above aluminum hydroxide is in the form of aluminum hydroxide gel, A dust collecting filter comprising an adsorbent, characterized in that the above aluminum hydroxide gel adsorbs dust.

4. In paragraph 1, A dust collecting filter comprising an adsorbent, characterized in that the adsorbent further comprises magnesium silicate.

5. In paragraph 4, A dust collecting filter comprising an adsorbent, characterized in that the adsorbent further comprises silica fume.

6. In paragraph 1, A dust collecting filter comprising an adsorbent, characterized in that the adsorbent further comprises silica fume.

7. In paragraph 1, A dust collecting filter comprising an adsorbent, characterized in that the adsorbent further comprises slaked lime.

8. A dust collecting device using a dust collecting filter according to any one of clauses 1 to 7.

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