KR101581824B1 - System and method for processing used refrigerant using Calcium-containing sludge - Google Patents

Abstract

According to an embodiment of the present invention, there is provided a waste refrigerant treatment system using a calcium-containing sludge, comprising: a combustion unit that supplies waste coal and paper sludge containing a halogen element and burns the waste paper sludge; And a sucker for receiving the exhaust gas discharged from the combustion unit and the sludge ash and calculating an adsorbate adsorbed on the halogen group element contained in the exhaust gas, .

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a system and a method for treating waste refrigerant using calcium-containing sludge,

The present invention relates to a system and method for treating waste refrigerant, and more particularly, to a system and method for treating waste refrigerant using calcium-containing sludge.

Currently, refrigerants such as chlorofluorocarbons (CFC) and hydrogen fluoride (HFC) are inevitably used in refrigerating apparatuses such as refrigerators and air conditioners, and are discarded together with waste refrigerants as they are discarded. The release of waste refrigerant into the atmosphere without appropriate treatment is the main cause of ozone depletion and global warming.

Accordingly, a technology for appropriately treating waste refrigerant, which is becoming more and more environmentally problematic, is being developed, and for example, an apparatus and a method for combusting waste refrigerant together with solid waste have been proposed (see Japanese Patent Laid-Open No. 2011-0023253 ). However, such a waste refrigerant processing apparatus is disadvantageous in that it requires a separate apparatus for treating the waste refrigerant, resulting in high processing cost.

According to an embodiment of the present invention, there is provided a waste liquid refrigerant treatment method and system capable of treating waste refrigerant using calcium-containing sludge.

According to an embodiment of the present invention, waste refrigerant is burned by using calcium-containing sludge treated as waste, and waste refrigerant, which is capable of producing absorbed adsorbed halogen group elements contained in the waste refrigerant by using paper sludge ash Processing method and system.

According to an embodiment of the present invention, there is provided a waste refrigerant treatment system using a calcium-containing sludge, comprising: a combustion unit that supplies waste coal and paper sludge containing a halogen element and burns the waste paper sludge; And a sucker for receiving the exhaust gas discharged from the combustion unit and the sludge ash and calculating an adsorbate adsorbed on the halogen group element contained in the exhaust gas, .

According to an embodiment of the present invention, there is provided a waste refrigerant processing system using a calcium-containing sludge, comprising: a combustion unit for supplying and burning a waste refrigerant containing a halogen group element and a first calcium-containing sludge; An incinerator for burning the second calcium-containing sludge; And a suction unit for receiving the discharge gas discharged from the combustion unit and the sludge ash discharged from the incinerator to calculate an adsorbate adsorbed on the halogen group element contained in the discharge gas, System is provided.

According to an embodiment of the present invention, there is provided a method of treating a waste refrigerant using a calcium-containing sludge, comprising the steps of: burning a waste refrigerant containing a halogen group element in a combustion section together with a calcium-containing sludge; Supplying the exhaust gas and the sludge ash discharged from the combustion unit to the adsorption unit; And a step of calculating, at the adsorption unit, adsorbed adsorbed halogen group elements contained in the exhaust gas, and a method of treating the waste refrigerant using the papermaking sludge.

According to an embodiment of the present invention, there is provided a method of treating a waste refrigerant using a calcium-containing sludge, comprising the steps of: burning a waste refrigerant containing a halogen element in a combustion section together with a first calcium-containing sludge; Burning the second calcium-containing sludge in the incinerator; Supplying the exhaust gas discharged from the combustion unit and the sludge ash discharged from the incinerator to the adsorption unit; And a step of calculating, at the adsorption unit, adsorbed adsorbed halogen group elements contained in the exhaust gas, and a method of treating the waste refrigerant using the papermaking sludge.

According to one embodiment of the present invention, there is an advantage that the waste refrigerant can be treated using the calcium-containing sludge treated as waste.

Further, according to one embodiment of the present invention, there is an advantage that the adsorbent adsorbed by the halogen group element contained in the waste refrigerant can be calculated by using the papermaking sludge ash produced after treating the calcium-containing sludge.

1 is a schematic view of a waste refrigerant treatment system using calcium-containing sludge according to a first embodiment of the present invention,
FIG. 2 is a flow chart for explaining an exemplary waste liquid refrigerant treatment method using the waste refrigerant treatment system of FIG. 1;
3 is a schematic view of a waste refrigerant treatment system using calcium-containing sludge according to a second embodiment of the present invention,
FIG. 4 schematically illustrates a waste refrigerant treatment system using calcium-containing sludge according to a third embodiment of the present invention, FIG.
FIG. 5 is a flow chart for explaining an exemplary waste liquid refrigerant processing method using the waste refrigerant processing system of FIG. 4;
6 is a diagram schematically illustrating a waste refrigerant treatment system using calcium-containing sludge according to a fourth embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The above and other objects, features, and advantages of the present invention will become more readily apparent from the following description of preferred embodiments with reference to the accompanying drawings. However, the present invention is not limited to the embodiments described herein but may be embodied in other forms. Rather, the embodiments disclosed herein are provided so that the disclosure can be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

Where the terms first, second, etc. are used herein to describe components, these components should not be limited by such terms. These terms have only been used to distinguish one component from another. The embodiments described and exemplified herein also include their complementary embodiments.

In the present specification, the singular form includes plural forms unless otherwise specified in the specification. The terms "comprise" and / or "comprising" used in the specification do not exclude the presence or addition of one or more other elements.

Hereinafter, the present invention will be described in detail with reference to the drawings. In describing the specific embodiments below, various specific details have been set forth in order to explain the invention in greater detail and to assist in understanding it. However, it will be appreciated by those skilled in the art that the present invention may be understood by those skilled in the art without departing from such specific details. In some cases, it should be mentioned in advance that it is common knowledge in describing an invention that parts not significantly related to the invention are not described in order to avoid confusion in explaining the present invention.

In the present specification, calcium-containing sludge means sludge containing calcium. The calcium-containing sludge can be, for example, paper sludge, sewage sludge, or dye waste wastewater sludge, and since such sludges are exemplary, the present invention is not limited to such sludges. Those skilled in the art (those skilled in the art) will understand. In the following, one or more embodiments of the present invention will be described by way of example using paper sludge as calcium-containing sludge.

FIG. 1 is a diagram schematically illustrating a waste refrigerant processing system according to a first embodiment of the present invention, and FIG. 2 is a flowchart for explaining an exemplary waste refrigerant processing method using the waste refrigerant processing system.

Referring to FIG. 1, the waste refrigerant processing system according to the first embodiment may include a combustion unit 10, an adsorption unit 20, and a heat exchanger 30.

The combustion unit 10 receives the waste refrigerant and the paper sludge and burns the waste refrigerant and the paper sludge. The adsorbing unit 20 absorbs the halogen element contained in the exhaust gas by receiving the exhaust gas discharged from the combustion unit 10 and the paper sludge ash One adsorbed product can be calculated. The heat exchanger 30 is disposed between the combustion section 10 and the adsorption section 20 and can lower the temperature of the exhaust gas discharged from the combustion section 10 and supply the temperature to the adsorption section 20. In the illustrated embodiment, the exhaust gas discharged from the combustion unit 10 contains hydrogen fluoride (HF), and the HF in the adsorption unit 20 is adsorbed to the paper sludge ash to produce CaF ₂ (fluorite) .

Referring to FIG. 2, in step S110, the combustion unit 10 receives waste refrigerant and paper sludge and burns the waste refrigerant and paper sludge. In one embodiment, the waste refrigerant comprises a refrigerant (e.g., HFC, CFC, etc.) containing at least one halogen group element such as fluorine (F), chlorine (Cl) For the sake of convenience in the following examples, a waste refrigerant containing fluorine (F) is assumed, and hydrogen fluoride (HFC) will be exemplified below. The papermaking sludge is preferably paper sludge containing a large amount of water, and papermaking sludge having a moisture content of, for example, 60% or more can be used.

The combustion unit 10 is supplied with waste refrigerant and paper sludge and burns it in a high-temperature atmosphere to produce exhaust gas containing papermaking sludge ash and hydrogen fluoride (HF). That is, the paper sludge is burned in the combustion unit 10 to become paper sludge ash, and hydrogen fluoride (HFC) is converted into hydrogen fluoride (HF). The exhaust gas may include at least one of gases such as water vapor (H ₂ O), carbon dioxide (CO ₂ ), and nitrogen (N ₂ ) in addition to HF.

In order to perform the combustion reaction, a high-temperature atmosphere and moisture supply are required inside the combustion unit 10. In one embodiment, the combustion zone 10 is maintained at a temperature above 900 degrees Celsius. To this end, the inside of the combustion unit can be heated by electric heating or a heating means such as a burner at first, and paper sludge itself can be burned as a heat source by supplying the paper sludge thereafter. In addition, since the paper sludge contains moisture, moisture is supplied to the paper sludge during burning and it is not necessary to separately supply water (steam) to the burning unit 10. Therefore, it is possible to maintain high temperature and supply moisture in the combustion section 10 through the supply of the paper sludge, and to generate HF by burning the HFC gas under such atmosphere.

Next, in step S120, the discharge gas and the paper sludge ash discharged from the combustion section 10 are supplied to the adsorption section 20. Exhaust gas including papermaking sludge ash and HF produced in the combustion unit 10 can be supplied to the adsorption unit 20 through one connection pipe and alternatively can be supplied to the adsorption unit 20 via the separate connection pipes Respectively.

According to the present embodiment, it is preferable that the temperature is lowered before the exhaust gas is supplied into the adsorption section 20, so that it may further include lowering the temperature of the exhaust gas before the step S120. The heat exchanger 30 is disposed between the combustion unit 10 and the adsorption unit 20 to lower the temperature of the exhaust gas discharged from the combustion unit 10 to the adsorption unit 20 Supply.

Next, in step S130, the adsorption section 20 can calculate the adsorbate adsorbed on the halogen group element contained in the exhaust gas.

In one embodiment, the adsorbent 20 is fed with an effluent gas comprising HF and papermaking sludge ash to produce CaF ₂ . To this end, in one embodiment, the discharge gas is contacted with the paper sludge ash in the adsorption unit 20 so that the exhaust gas is adsorbed on the paper sludge ash. For example, the adsorption section 20 can be configured so that the exhaust gas passes through a layer made of paper sludge ash. In addition, in a preferred alternative embodiment, water is supplied to the offgas to convert HF in the offgas to hydrofluoric acid (fluorinated gas aqueous solution), since hydrofluorocarbons are generally more reactive when HF is in aqueous solution, As shown in FIG. That is, the reactivity can be improved by supplying moisture to the exhaust gas in the reactor 20 and passing the HF through the ash in a state of condensing HF into a liquid state (hydrofluoric acid).

The adsorption unit 20 supplies the discharge gas containing HF and the paper sludge ash to calculate fluorite (CaF ₂ ). Since fluorspar is a stabilized mineral and widely used in industry, it can be processed in various ways in post-processes not shown.

According to the waste refrigerant treatment system as described above, the paper sludge in the combustion unit 10 itself serves as an energy source and a steam supply source and is changed into paper sludge ash by burning, and HF is calculated from the HFC by the heat of combustion And the papermaking sludge ash produced at this time can be used again as a material adsorbing HF in the adsorption unit 20 and react with HF to produce CaF ₂ . That is, according to one embodiment of the present invention, paper sludge treatment and waste refrigerant treatment can be performed simultaneously by introducing waste refrigerant into the process of treating paper sludge.

3 is a schematic diagram illustrating a waste refrigerant processing system according to a second embodiment of the present invention.

Comparing FIG. 1 and FIG. 3, the waste refrigerant treatment system of the second embodiment differs from the waste-refrigerant treatment system of FIG. 1 in the structure of the combustion section 10 and the heat exchanger 30, The adsorption section 20 of the first embodiment is different from the adsorption section 20 of the first embodiment in that the adsorption section 40 is further supplied with water H2O.

In the construction of the second embodiment, the adsorption unit 40 is further supplied with water, and mixes the paper sludge ash supplied from the combustion unit 10 to make the paper sludge ash slurry. The slurry may then be configured to spray or pass HF-containing effluent gas through which HF may be adsorbed to produce CaF ₂ .

4 is a diagram schematically illustrating a waste refrigerant processing system according to a third embodiment of the present invention.

Referring to the drawings, the waste refrigerant processing system according to the third embodiment may include a combustion unit 50, an incineration unit 60, a suction unit 70, and a heat exchanger 80.

The combustion unit 50 supplies and combusts the waste refrigerant containing the halogen element and the paper sludge, and the heat exchanger 80 is a device for lowering the temperature of the exhaust gas discharged from the combustion unit 50. The combustion unit 50 and the heat exchanger 80 are the same as or similar in configuration and function to the combustion unit 10 and the heat exchanger 30 of the first embodiment, and a detailed description thereof will be omitted.

On the other hand, the incinerator 60 according to the third embodiment feeds a portion of the paper sludge, burns the paper sludge, calculates the paper sludge ash, and supplies the calculated paper sludge ash to the adsorption unit 70. Thus, the adsorption unit 70 receives the exhaust gas containing HF from the combustion unit 50 and receives the paper sludge ash from the incineration unit 60. In an alternative embodiment, the adsorption section 70 may also receive paper sludge ash from the combustion section 50 along with the HF-containing effluent gas. That is, the adsorbing part 70 may simultaneously receive the paper sludge ash from the combustion part 50 and the incineration part 60.

Other structures and functions of the adsorption section 70, except for the way of receiving the paper sludge ash, are the same as or similar to the adsorption section 30 of the first embodiment. That is, the adsorption unit 70 receives the exhaust gas and the paper sludge ash and calculates the adsorbate adsorbing the halogen group element contained in the exhaust gas. In one embodiment for this purpose, the adsorption section 70 may be configured so that the off-gas passes through the bed of paper mill sludge ash. In an alternative embodiment, the adsorption unit 70 may be configured to combine water with exhaust gas to produce hydrofluoric acid (fluorinated gas solution) and then pass hydrofluoric acid through the paper sludge ash. Through this process, fluorite (CaF ₂ ) Can be calculated.

FIG. 5 is a flowchart for explaining an exemplary method of treating a waste refrigerant using the waste refrigerant processing system of FIG. 4; Referring to the drawing, in step S210, the waste refrigerant and the paper sludge containing a halogen element are combusted in the combustion part 50. [ In step S220, another papermaking sludge is burned. In this case, the two steps (S210 and S220) may be performed simultaneously or at different times.

Thereafter, in step S230, the discharge gas discharged from the combustion unit 50 and the paper sludge ash discharged from the incineration unit 60 are supplied to the adsorption unit 70. [ At this time, it is preferable to further include a step of lowering the temperature of the exhaust gas, for example, allowing the exhaust gas to pass through the heat exchanger 80 to lower the temperature of the exhaust gas.

Also, in an alternative embodiment of this step S230, the papermaking sludge ash produced in the combustion section 50 and the papermaking sludge ash generated in the incineration section 60 may both be supplied to the adsorption section 70. [

Next, in step S240, the adsorption unit 70 supplied with the exhaust gas and the paper sludge ash contacts the paper dust sludge ash so that the paper sludge ash adsorbs the exhaust gas, thereby adsorbing the halogen group element And one adsorbate (e.g., fluorite (CaF ₂ )) is calculated.

To do this, in step S240, the off-gas may be passed through the layer of papermaking sludge ash. In an alternative embodiment, water may also be supplied to the off-gas to produce hydrofluoric acid (fluorous gas aqueous solution) and then pass hydrofluoric acid through the paper sludge ash.

6 is a diagram schematically showing a waste refrigerant processing system according to a fourth embodiment of the present invention.

Comparing FIGS. 6 and 4, the combustion section 50, the incineration section 60, and the heat exchanger 80 of the waste refrigerant treatment system of the fourth embodiment of FIG. 6 are the same as those of the third embodiment of FIG. And is different from the adsorption section 70 of the third embodiment in that the adsorption section 90 of the fourth embodiment is further supplied with water (H ₂ O).

In the structure of the fourth embodiment, water is further supplied to the adsorption unit 90, water is mixed with the paper sludge ash supplied from the incineration unit 60 to make the paper sludge ash slurry, and then HF And CaF ₂ can be calculated by spraying or passing through the exhaust gas contained therein.

Variation example

Those skilled in the art will appreciate that various modifications are possible in addition to the waste refrigerant treatment system according to the first to fourth embodiments described above with reference to Figs.

For example, sludge containing little or no moisture may be supplied to the combustion section 10. In this case, the waste refrigerant treatment system may further include a steam supply unit for separately supplying water (steam) to the combustion unit 10. [

As another modification, the heat exchangers 30 and 80 may be included in the combustion unit 10, 50 or the adsorption units 20, 40, 70, and 90 without being present as separate components. That is, the functional unit that performs the function of lowering the temperature of the exhaust gas may be an embodiment of the present invention if the exhaust gas is disposed in any path before the exhaust gas is adsorbed in the paper sludge ash in the adsorption unit.

In the above-described embodiments, paper sludge is used as an example, but sludge other than paper sludge can be used. For example, sludge containing calcium, such as sewage sludge, manure sludge, dyeing wastewater sludge, etc., can also be used.

In addition, although HFC has been described as an example of the waste refrigerant in the above embodiments, it is needless to say that the present invention can be applied to other refrigerants containing at least one halogen group element such as fluorine (F), chlorine (Cl) and the like. For example, when chlorofluorocarbon (CFC) is used as the waste refrigerant, the Cl-containing gas generated in the combustion section 10 reacts with the calcium-containing sludge ash in the adsorption section 20 to produce calcium chloride (CaCl ₂ ) The calcium chloride thus produced can be used as a snow remover or the like.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. Therefore, the scope of the present invention should not be limited by the described embodiments, but should be determined by the scope of the appended claims, as well as the appended claims.

10, 50:
20, 40, 70, 90: adsorption unit
30, 80: heat exchanger
60: incinerator

Claims (20)

A waste refrigerant treatment system using calcium-containing sludge,
A burner for supplying and burning waste refrigerant containing a halogen group element and calcium containing sludge containing moisture;
A suction unit for receiving the exhaust gas discharged from the combustion unit and the sludge ash and calculating an adsorbate adsorbed on the halogen group element contained in the exhaust gas;
And a heat exchanger disposed between the combustion section and the adsorption section,
Wherein the calcium-containing sludge is combusted as an energy source and a steam source in the combustion section to become the sludge ash, and in the adsorption section, the sludge ash functions as an adsorbent adsorbing the exhaust gas,
The calcium-containing sludge is paper sludge, sewage sludge, or dye waste wastewater sludge,
Wherein the heat exchanger is configured to lower the temperature of the exhaust gas discharged from the combustion unit, and the adsorption unit is configured to allow the exhaust gas to pass through the sludge ash. delete delete The method according to claim 1,
The waste refrigerant is a refrigerant containing fluorine (F)
Wherein the adsorbing unit is configured to combine the exhaust gas with water to generate hydrofluoric acid (fluorinated gas aqueous solution), and the hydrofluoric acid passes through the sludge ash. The method according to claim 1,
Wherein the adsorbent is further supplied with water to make the sludge ash slurry, and the exhaust gas passes through the sludge ash in the slurry state. A waste refrigerant treatment system using calcium-containing sludge,
A burner for supplying and burning a waste refrigerant containing a halogen group element and a first calcium-containing sludge containing moisture;
An incinerator for burning the second calcium-containing sludge containing water;
An adsorption unit for receiving the exhaust gas discharged from the combustion unit and the sludge ash discharged from the incinerator to calculate an adsorbate adsorbing a halogen group element contained in the exhaust gas; And
And a heat exchanger disposed between the combustion section and the adsorption section,
The calcium-containing sludge is burnt as an energy source and a steam supply source in the combustion section to become the sludge ash. In the adsorption section, the sludge ash functions as an adsorbent adsorbing the exhaust gas,
The calcium-containing sludge is paper sludge, sewage sludge, or dye waste wastewater sludge,
Wherein the heat exchanger is configured to lower the temperature of the exhaust gas discharged from the combustion unit, and the adsorption unit is configured to allow the exhaust gas to pass through the sludge ash. delete delete The method according to claim 6,
The waste refrigerant is a refrigerant containing fluorine (F)
Wherein the adsorbing unit is configured to combine the exhaust gas with water to generate hydrofluoric acid (fluorinated gas aqueous solution), and the hydrofluoric acid passes through the sludge ash. The method according to claim 6,
Wherein the adsorbent is further supplied with water to make the sludge ash slurry, and the exhaust gas passes through the sludge ash in the slurry state. A method for treating waste refrigerant using calcium-containing sludge,
Combusting a waste refrigerant containing a halogen group element together with calcium-containing sludge containing moisture in a combustion section;
Lowering the temperature of the exhaust gas discharged from the combustion unit;
Supplying the exhaust gas through the step of lowering the temperature of the exhaust gas and the sludge ash discharged from the combustion unit to the adsorption unit; And
And a step of calculating, in the adsorption section, an adsorbate adsorbing a halogen group element contained in the exhaust gas,
The calcium-containing sludge is burnt as an energy source and a steam supply source in the combustion section to become the sludge ash. In the adsorption section, the sludge ash functions as an adsorbent adsorbing the exhaust gas,
The calcium-containing sludge is paper sludge, sewage sludge, or dye waste wastewater sludge,
Wherein the step of calculating the adsorbed product comprises passing the exhaust gas through the sludge ash. delete delete 12. The method of claim 11,
The waste refrigerant is a refrigerant containing fluorine (F)
Wherein the step of calculating the adsorbent comprises:
Further comprising the step of supplying water to the exhaust gas to produce hydrofluoric acid (fluorinated gas aqueous solution)
Wherein the step of passing the exhaust gas through the sludge ash is a step of passing the hydrofluoric acid through the sludge ash. 12. The method of claim 11, wherein the step of calculating the adsorbent comprises:
Supplying water to the adsorption unit to make the sludge ash slurry; Further comprising:
Wherein the step of passing the discharge gas through the sludge ash is a step of passing the discharge gas through the sludge ash in a slurry state. A method for treating waste refrigerant using calcium-containing sludge,
Burning a waste refrigerant containing a halogen group element in a combustion portion together with a first calcium-containing sludge containing moisture;
Burning a second calcium-containing sludge containing moisture in an incinerator;
Lowering the temperature of the exhaust gas discharged from the combustion unit;
Supplying the exhaust gas through the step of lowering the temperature of the exhaust gas and the sludge ash discharged from the combustion unit and the sludge ash discharged from the incinerator to the adsorption unit; And
And a step of calculating, in the adsorption section, an adsorbate adsorbing a halogen group element contained in the exhaust gas,
The calcium-containing sludge is burnt as an energy source and a steam supply source in the combustion section to become the sludge ash. In the adsorption section, the sludge ash functions as an adsorbent adsorbing the exhaust gas,
The calcium-containing sludge is paper sludge, sewage sludge, or dye waste wastewater sludge,
Wherein the step of calculating the adsorbed product comprises passing the exhaust gas through the sludge ash. delete delete 17. The method of claim 16,
The waste refrigerant is a refrigerant containing fluorine (F)
Wherein the step of calculating the adsorbent comprises:
Further comprising the step of supplying water to the exhaust gas to produce hydrofluoric acid (fluorinated gas aqueous solution)
Wherein the step of passing the exhaust gas through the sludge ash is a step of passing the hydrofluoric acid through the sludge ash. 17. The method of claim 16,
Wherein the step of calculating the adsorbent comprises:
Supplying water to the adsorption unit to make the sludge ash slurry; Further comprising:
Wherein the step of passing the discharge gas through the sludge ash is a step of passing the discharge gas through the sludge ash in the slurry state.

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