KR20200065164A - The all in one type system of carbon dioxide collecting and transforming into carbonated mineral at cement industry - Google Patents

Abstract

The present invention provides an integrated system for collecting carbon dioxide and transforming carbonated mineral in cement industry, to transform waste of a cement manufacturing process into useful carbonated minerals. According to the present invention, the integrated system comprises: a cation extraction unit using an extraction agent to selectively extract cation from waste discharged from the cement manufacturing process; a simultaneous collection/mineralization unit using an absorbent to collect the carbon dioxide discharged from the cement manufacturing process and reacting the collected cabinet with the cation supplied from the cation extraction unit to produce carbonated mineral; a mineral-absorbent separation unit separating the absorbent from the carbonated mineral produced in the simultaneous collection/mineralization unit and resupplying the separated absorbent to the simultaneous collection/mineralization unit; an alkali electrolysis tank recovering and regenerating the extraction agent used in the cation extraction unit and resupplying the regenerated extraction agent to the cation extraction unit; and a waste heat supply unit supplying waste heat generated during the cement manufacturing process to the alkali electrolysis tank.

Description

The all in one type system of carbon dioxide collecting and transforming into carbonated mineral at cement industry}

The present invention relates to an integrated system for capturing carbon dioxide and converting carbon dioxide minerals in the cement industry, and more specifically, it is possible to reduce ozone gas generated due to the emission of carbon dioxide using carbon dioxide and cations generated in the cement industry. And, furthermore, it relates to an integrated system for carbon dioxide capture and conversion of carbon dioxide minerals in the cement industry that can simultaneously convert to various types of industrially useful carbon dioxide minerals using cations extracted from the collected carbon dioxide and waste.

The cement industry is an important national key industry that produces cement, which is an essential foundation material for the construction and civil engineering industries, and it is also a device industry that requires large initial investment costs, making it difficult for new companies to enter the market. Ssangyong, Sungshin, Hyundai, Asia, La Paz, and Halla) 7 major companies are operating under an oligopolistic system that occupies more than 90% of domestic production.

As of 2015, 8 companies that have kilns for clinker production produce 62,042 thousand tons of clinker, and cement production facilities possess 100 units in 11 companies, producing 52,043 thousand tons annually, exporting 7.3 million tons, and importing 1.15 million tons. It is the sixth largest exporter in the world.

The amount of CO ₂ generated in the cement process may vary depending on cement production, kiln capacity, preheater, milling equipment, etc. In general, it is estimated that about 0.85 tons of CO ₂ is generated per 1 ton of clinker. Particularly, calcination during calcination during the manufacturing process accounts for about 95% of the total generation and 50% of production cost. The above is estimated as energy cost.

In 2014, the greenhouse gas emissions in the mineral industry (cement production, lime production, limestone and dolomite consumption, soda ash production and consumption, etc.) were 33,165 thousand tons-CO2eq. (2016 National Greenhouse Gas Inventory Report). %, and the GHG emissions by cement companies based on the Greenhouse Gas Information Center are shown in Table 1 below.

In order to prevent global warming, efforts to reduce greenhouse gas emissions from around the world are continuing, and in December 2016, through the COP21 in Paris, Korea reduced its INDC to reduce 37% of the 2030 emission forecast (850.6 million-CO2 tons). It has been submitted.

Among the greenhouse gas reduction targets for each sector, the industrial sector reduction amount is 56.4 million tons (reduction rate 11.7%), and the reduction amount allocated to the cement industry is 2.4 million tons (reduction rate 7%) (2030 National Greenhouse Gas Reduction Basic Roadmap, 2016) .

In order to achieve this, greenhouse gas reduction technology should be applied to a fixed emission source that emits a large amount of greenhouse gas, but there is no economic and effective greenhouse gas reduction technology.

Accordingly, the present invention was devised to solve the above problems, and it is possible to reduce ozone gas generated due to the emission of carbon dioxide by using carbon dioxide and cations generated in the cement industry, and furthermore, from the collected carbon dioxide and waste. It is an object to provide an integrated system for carbon dioxide capture and conversion of carbonate minerals in the cement industry that can be simultaneously converted to various types of industrially useful carbonate minerals using extracted cations.

The technical problem of the present invention as described above is achieved by the following means.

(1) a cation extraction unit for selectively extracting cations using an extractant from wastes produced in the cement production process; A capture mineral simultaneous process performing unit for collecting carbon dioxide discharged from the cement production process using an absorbent and reacting the collected carbon dioxide with cations supplied from the cation extraction supply unit to produce carbonate minerals; A mineral absorber separating unit separating the carbonate mineral and the absorbent produced by the capture mineral synchronizing process performing unit and re-supplying the separated absorbent to the collecting mineral synchronizing process performing unit; An extractant regenerating unit for recovering and recovering the extractant used in the cation extraction unit, and re-supplying the regenerated extractant to the cation extraction unit; And a waste heat supply unit that supplies waste heat generated in the cement production process to the extractor regeneration unit. The integrated system for carbon dioxide capture and conversion of carbon dioxide minerals in the cement industry.

(2) In the above (1),

The cation extraction unit is a waste discharged from the cement production process, and captures carbon dioxide in the cement industry, characterized in that it is at least one selected from the group of kiln dust, steel slag, waste concrete, and pet-cokes desulfurizer. And an integrated system for the conversion of carbonate minerals.

As described above, the system according to the present invention can reduce the ozone gas generated due to the emission of carbon dioxide by using carbon dioxide and cations generated in the cement industry, and furthermore, use the collected carbon dioxide and cations extracted from waste. It can provide an effect that can be simultaneously converted to various types of industrially useful carbonate minerals.

1 is a block diagram of an integrated system according to the present invention.
2 is a conceptual explanatory diagram of the configuration of the integrated system of the present invention.
3 is an explanatory diagram of the regeneration process using the electrochemical process of the extractant.
Figure 4 is a detailed configuration diagram of the capture mineral simultaneous process execution unit according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. DETAILED DESCRIPTION The following detailed description, together with the accompanying drawings, is intended to describe exemplary embodiments of the present invention, and is not intended to represent the only embodiments in which the present invention may be practiced. The following detailed description includes specific details to provide a thorough understanding of the present invention. However, one of ordinary skill in the art to which the present invention pertains knows that the present invention may be practiced without these specific details.

In some cases, in order to avoid obscuring the concept of the present invention, well-known structures and devices may be omitted, or block diagrams centered on the core functions of each structure and device may be illustrated.

Throughout the specification, when a part "comprising or including" a certain component, this means that other components may be further included instead of excluding other components, unless otherwise specified. do. In addition, the term "… part" described in the specification means a unit that processes at least one function or operation. In addition, "a (a or an)", "one (one)," "the (the)" and similar related terms in the context of describing the present invention (especially in the context of the following claims) is different herein. It may be used in a sense including both singular and plural unless indicated or clearly contradicted by context.

In describing embodiments of the present invention, when it is determined that a detailed description of known functions or configurations may unnecessarily obscure the subject matter of the present invention, the detailed description will be omitted. In addition, terms to be described later are terms defined in consideration of functions in an embodiment of the present invention, which may vary according to a user's or operator's intention or practice. Therefore, the definition should be made based on the contents throughout this specification.

The integrated system for capturing carbon dioxide and converting carbon dioxide minerals in the cement industry according to the present invention can reduce the ozone gas generated due to the emission of carbon dioxide by using carbon dioxide and cations generated in the cement industry, and furthermore, collected carbon dioxide. And cations extracted from wastes to simultaneously convert into various types of industrially useful carbonate minerals.

To this end, the integrated system for the capture of carbon dioxide and conversion of carbonate minerals in the cement industry according to the present invention, as shown in Figure 1, cation extraction section 10, capture mineralization simultaneous process execution section 20, mineral absorber It includes a separation unit 30, an extractant regeneration unit 40, and a waste heat supply unit 50.

Hereinafter, a detailed description of the configuration of the present invention will be described with reference to FIGS. 2 to 4.

The cation extracting unit 10 uses an extractant (eg, HCl, HClO, etc.) in at least one selected from the group of waste kiln dust, steel slag, waste concrete, and pet-cokes desulfurization agent. Metal cations such as Ca and Mg are extracted. Preferably, the extraction reaction is linked to the regeneration process of the extractant, and this regeneration process is performed by the extractor regeneration unit 40 using a scrubber and an alkaline electrolyzer.

The capture mineralization simultaneous process execution unit 20 collects carbon dioxide discharged from the cement production process using an absorbent, and collects the collected carbon dioxide through cations supplied from the cation extraction unit 10 and the following reaction formula 1. Produce carbonate minerals.

[Scheme 1]

In the present invention, the capture mineralization simultaneous process execution unit 20 performs carbon dioxide capture and mineralization processes simultaneously in one reactor. To this end, carbon dioxide discharged from the production process, an absorption liquid containing an absorbent, and a cation supplied from a cation extraction unit are simultaneously input to the reactor, and carbon dioxide is converted into carbonate ions by the absorption liquid, and carbonate ions react with the injected cations to form carbonic acid. It becomes a mineral, and all these processes are performed under normal temperature and normal pressure.

The mineral absorber separating unit 30 continuously separates the mixed liquid of the absorbent liquid, water, and carbonate mineral obtained as a result of the reaction from the reactor of the capture mineralization simultaneous process performing unit 20 into liquid and solid carbonate minerals and dehydrates as described above. Perform. After separation, the liquid phase is reused in a shearing process and the solid phase carbonate mineral evaporates moisture using airflow drying technology.

The extractant regeneration unit 40 recovers and recovers the extractant used in the cation extraction unit 10, and re-supplies the regenerated extractant to the cation extraction unit 10.

That is, as shown in FIG. 3, KOH is introduced to adjust the pH required for the extraction process, and KCl and KClO generated through reaction with the extractants HCl and HClO in the extraction process are introduced into the alkaline electrolytic bath 40. In addition, chlorine gas and oxygen gas are generated at the anode through the electrolysis process and water is introduced into the scrubber along with oxygen discharged from the scrubber to be recycled to HCl and HClO. , KOH is generated in the cathode and is supplied to the cation extraction unit 10 again.

The waste heat supply unit 50 supplies waste heat generated in the cement production process to the extractor regeneration unit 40 to be reused as energy required for the regeneration process.

As illustrated in FIG. 4, as an embodiment of the present invention, the concurrently performing the process of collecting minerals is illustrated. The collected mineralization simultaneous process execution unit 20 includes a blower 100 and a process execution unit 200.

The blower 100 is a means for supplying carbon dioxide generated in the cement industry facility to the process execution unit 200. The blower 100 may be operated at all times, or may be selectively operated only when the concentration of carbon dioxide exceeds a preset reference value.

The process execution unit 200 captures carbon dioxide supplied by the blower 100 and simultaneously performs a carbonic acid mineralization reaction.

The process performing part 200 includes an absorbent, and the absorbent is preferably non-volatile and non-toxic and is selected from biodegradable materials. Examples of the alkanolamines include materials such as MEA and MDEA.

To this end, the process performing unit 200, as shown in Figure 4, the absorption housing 210 and the absorber injection unit 220, the wet absorption filter 230, the absorption solid-liquid filter 240 and the cation supply unit 250 It includes.

The absorption housing 210 is formed with a filter space for air to flow in and out.

In addition, the absorbent injection unit 220 is provided to inject the absorbent into the filter space of the absorbent housing 210.

The absorbent injection unit 220 is formed of a supply pump for supplying the absorbent, a supply pipe and a spray nozzle.

The wet absorption filter 230 is provided to separate the carbon dioxide contained in the air by widening the contact area between the absorbent sprayed from the absorbent injection unit 220 and the gas blown from the blower 100 so that contact is effectively made. Preferably, the wet absorption filter 230 is a polypropylene (PP) material polling (pall ring).

In addition, the absorption solid-liquid filter 240 is provided at the upper end of the filter space part of the absorption housing 210 so as to separate the air that has passed through the wet absorption filter 230 into a solid-liquid separation.

Here, the wet absorption filter 230 and the absorbent injection unit 220 are sequentially provided in plural in the height direction of the absorption housing 210.

Looking at the operating state of the process performing unit 200, the absorbent is continuously sprayed by the absorbent injection unit 220, the sprayed absorbent is blower 100 in the state absorbed inside the wet absorption filter 230 The air containing carbon dioxide flows in.

In the introduced air, carbon dioxide contained in the process of passing through the pores of the wet absorption filter 230 containing the liquid is absorbed by the liquid, and the air is moved upward.

Here, the air moved to the upper side separates the liquid while passing through the absorption solid-liquid filter 240, and the carbon dioxide separated by the wet-absorption filter 230 is moved to the lower side with the liquid falling to the lower side to be stored.

For this process, the absorption housing 210 includes a housing body 211, a reaction unit 212, an air inlet unit 213, an air outlet unit 214, and an absorbent outlet unit 215.

The housing body 211 has a filter space therein and is formed long in the vertical direction.

In addition, the reaction unit 212 is provided at the lower end of the filter space unit so that the liquid absorbed by the carbon dioxide injected by the absorber injection unit 220 is stored. The reaction unit 212 is provided with a cation injection unit 250 supplied from the cation extraction unit 10.

The air inlet 213 is provided on the housing body 211 so that air blown from the blower 100 flows between the reservoir 212 and the wet absorption filter 230.

In addition, the air discharge unit 214 is provided for discharging air through which the liquid is separated through the absorption solid-liquid filter 240.

The absorbent discharge unit 215 is provided to discharge the absorbent stored in the reservoir 212.

Here, the air discharge unit 214 is composed of an air outlet 2142, an air communication pipe 2144, and an air blowing fan 2146.

The air outlet 2142 is provided at the upper end of the housing body 211, and the air communication pipe 2144 is provided to connect the air outlet 2142 and the room.

In addition, the air blowing fan 2146 is provided to blow air filtered through the air communication pipe 2144 by the applied power to the room.

In addition, the absorbent discharge unit 215 includes an absorbent discharge port 2151, a water level sensor 2152, an absorbent opening and closing valve 2153, and a discharge control unit 2154.

The absorbent discharge port 2151 is provided to discharge the absorbent of the reaction unit 212, and the water level sensor 2152 is provided to measure the water level of the reaction unit 212.

In addition, the absorbent opening and closing valve 2153 is provided to open and close the absorbent outlet 2215.

The discharge control unit 2154 automatically adjusts the water level of the reaction unit 212 by receiving the signal of the water level sensor 2152 and controlling the absorber opening/closing valve 2153.

The cation is supplied to the reaction unit 212 through the cation inlet 250 by the above-described configuration, and after the carbon dioxide trapped in the absorbent is carbonated, it reacts with the cation to obtain a carbonate mineral.

10: cation extraction unit
20: Collected mineralization simultaneous process execution department
30: mineral absorbent separator
40: extractant regeneration unit
50: waste heat supply

Claims (2)

A cation extraction unit selectively extracting cations using an extractant from wastes discharged from the cement production process; A capture mineral simultaneous process performing unit for collecting carbon dioxide discharged from the cement production process using an absorbent and reacting the collected carbon dioxide with cations supplied from the cation extraction supply unit to produce carbonate minerals; A mineral absorber separating unit separating the carbonate mineral and the absorbent produced by the capture mineral synchronizing process performing unit and re-supplying the separated absorbent to the collecting mineral synchronizing process performing unit; An extractant regenerating unit for recovering and recovering the extractant used in the cation extraction unit, and re-supplying the regenerated extractant to the cation extraction unit; And a waste heat supply unit that supplies waste heat generated in the cement production process to the extractor regeneration unit. The integrated system for carbon dioxide capture and conversion of carbon dioxide minerals in the cement industry. According to claim 1,
The cation extraction unit is a waste discharged from the cement production process, and captures carbon dioxide in the cement industry, characterized in that it is at least one selected from the group of kiln dust, steel slag, waste concrete, and pet-cokes desulfurizer. And an integrated system for the conversion of carbonate minerals.

Images