JP2014015351A - Carbonation cure equipment, and supply method of co2 inclusion gas for carbonation cure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To supply COinclusion gas of an optimal temperature and humidity to carbonation cure without a lot of power consumption and COdischarge in the carbonation cure using exhaust gas from an outside.SOLUTION: Carbonation cure equipment 1 includes: a cooling part 22 in which COinclusion gas passing a COinclusion gas passage 21 is cooled; and a heat part 24 in which the COinclusion gas passing the COinclusion gas passage 21 is heated after cooling at the cooling part 22, wherein in the cooling part 22, heat exchange of a cooling medium and the COinclusion gas is performed, a temperature of the COinclusion gas is made to a second target temperature set based on a first target temperature and a first target humidity, and humidity is made to 100%, in the heat part 24, heat exchange of a heat medium and the COinclusion gas is performed, thereby a temperature of the COinclusion gas is made to a first target temperature, humidity is made to a first target humidity. The COinclusion gas of an optimal temperature and humidity is supplied to the carbonation cure without a lot of power consumption and COdischarge by the carbonation cure equipment 1.

Description

The present invention relates to a carbonation curing facility and a CO ₂ -containing gas supply method for carbonation curing for producing carbonated concrete having durability.

Conventionally, as a carbonation curing method for producing carbonated concrete, a method of performing carbonation curing using exhaust gas discharged from a thermal power plant is known. In the carbonation curing method, the exhaust gas discharged from the thermal power plant is set to an optimum temperature and humidity by a temperature / humidity adjusting device, and the carbonation curing is performed using the optimized contained gas. Usually, a large amount of CO ₂ -containing gas is required to perform carbonation curing, but by using exhaust gas from a thermal power plant, it has become possible to supply CO ₂ -containing gas economically (for example, Patent Document 1).

Japanese Patent No. 4822373

However, in the conventional method, it is necessary to set the exhaust gas of the thermal power plant to the optimum temperature and humidity for the carbonation curing by the temperature / humidity adjusting device. Use of a humidifier or dehumidifier consumes a large amount of power. When a large amount of electric power is generated, a large amount of CO ₂ is discharged, so there is a concern about an increase in environmental load.

As described above, in carbonation curing using exhaust gas from the outside, it has been conventionally possible to supply a CO ₂ -containing gas at a temperature and humidity optimum for carbonation curing without a large amount of power consumption and CO ₂ emission. It was sought after.

The present invention has been made to solve such problems, and is optimal for carbonation curing without a large amount of power consumption and CO ₂ emission in carbonation curing using exhaust gas from the outside. The object is to supply a CO ₂ -containing gas having a proper temperature and humidity.

As a result of intensive studies in order to solve the above problems, the present inventor has found the following knowledge. In the process of obtaining the CO ₂ -containing gas having the optimum temperature and humidity for the carbonation curing, even if the high-temperature exhaust gas from the outside is lowered to the target temperature, the humidity is too high to be set to the target humidity. However, when the high-temperature exhaust gas is cooled, the humidity becomes 100% at a certain temperature, and thereafter, the temperature is lowered while removing excess moisture with the humidity being 100%. If it is cooled to a predetermined temperature in a state where the humidity is 100% and then heated to the final target temperature, the humidity can be set to the target humidity as a result. Furthermore, since the predetermined temperature can be uniquely determined from the target temperature and the target humidity, it can be set in advance as the second target temperature. As described above, a CO ₂ -containing gas having a desired temperature and humidity can be obtained simply by cooling and heating the exhaust gas to a preset target temperature. Therefore, it is possible to supply the CO ₂ -containing gas at a temperature and humidity optimum for carbonation curing with a simple heat exchange structure using a cooling medium / heating medium having a constant temperature obtained from the outside.

In addition, as a result of further earnest research, the inventor does not slow down the carbonation rate in the carbonation curing by using the means for obtaining the CO ₂ -containing gas in the heat exchange structure as described above. It came to discover. The exhaust gas contains SOx that slightly lowers the rate of carbonation, but the SOx in the exhaust gas is easily dissolved in water. Therefore, it becomes possible to simultaneously remove SOx in the process of removing excess moisture by cooling, so that the CO ₂ -containing gas having the optimum temperature and humidity for the carbonation curing has a low SOx concentration and the carbonation rate. It came to find out that it can be made into the state which does not reduce. The present invention has been made based on these findings.

A carbonation curing facility according to the present invention is a carbonation curing facility that performs carbonation curing with a CO ₂ -containing gas containing CO ₂ with a temperature as a first target temperature and a humidity as a first target humidity. , by cooling the CO ₂ containing gas, and a second target temperature which is determined based on the temperature of the CO ₂ containing gas to a first target temperature and the first target humidity, and a cooling unit for the humidity 100% after cooling in the cooling section, by heating the CO ₂ containing gas, the temperature of the CO ₂ containing gas to the first target temperature, comprise a heating unit for humidity and the first target humidity, and It is characterized by.

In this carbonation curing equipment, in order to obtain a CO ₂ -containing gas having an optimum temperature (first target temperature) and optimum humidity (first target humidity) for carbonation curing, the CO ₂ -containing gas is cooled. And a heating unit that heats the CO ₂ -containing gas cooled by the cooling unit. The cooling unit cools the CO ₂ -containing gas so that the CO ₂ -containing gas becomes a second target temperature that is uniquely determined from the first target temperature and the first target humidity, and the heating unit receives the CO ₂ -containing gas. There to be a first target temperature and the first target humidity, heat of CO ₂ containing gas. When CO ₂ -containing gas with predetermined conditions is obtained from the outside, it is complicated during operation by setting the cooling capacity of the cooling section and the heating capacity of the heating section at the time of installation of the carbonation curing equipment according to those conditions. Temperature control and humidity control become unnecessary. This makes it possible to easily obtain a CO ₂ -containing gas for carbonation curing without a large amount of power consumption and CO ₂ emission.

As described above, according to the carbonation curing equipment according to the present invention, it is possible to supply the CO ₂ -containing gas having the optimum temperature and humidity for the carbonation curing without a large amount of power consumption and CO ₂ emission. .

Further, carbonation curing equipment according to the present invention, the supply and CO ₂ containing gas flow passage through which the CO ₂ containing gas, constant CO ₂ containing gas channel temperature, constant humidity, the CO ₂ containing gas at a constant flow rate and CO ₂ containing gas supply unit for, further comprising a cooling unit includes a cooling medium flow path and the cooling medium supply unit, the coolant flow field, the cooling medium by passing a cooling medium and CO ₂ Cooling is performed by exchanging heat with the contained gas, the cooling medium supply unit supplies a cooling medium having a constant temperature to the cooling medium channel, and the heating unit includes the heating medium channel and the heating medium supply unit. The heating medium flow path is heated by exchanging heat between the heating medium and the CO ₂ -containing gas by passing the heating medium, and the heating medium supply section is heated at a constant temperature in the heating medium flow path. It is preferable to supply a medium.

A cooling unit that performs heat exchange between the cooling medium flowing through each flow path and the CO ₂ -containing gas, and each flow path so that the CO ₂ -containing gas has a first target temperature and a first target humidity. A heating unit that exchanges heat between the flowing heating medium and the CO ₂ -containing gas. Therefore, during operation, can be only by heat exchange between the medium and the CO ₂ containing gas, to obtain a first desired temperature, the CO ₂ containing gas of the first target humidity. In this way, it becomes possible to obtain a CO ₂ -containing gas for carbonation curing using a simple heat exchange structure using a flow path and a supply unit. In addition, because of such a simple configuration, a CO ₂ -containing gas having a constant temperature and a constant humidity can be obtained from the outside, and if a cooling medium and a heating medium having a constant temperature are obtained, cooling can be easily performed according to those conditions. Capability and heating capability can be set.

In addition, the carbonation curing CO ₂ -containing gas supply method according to the present invention is a carbonation curing CO ₂ that supplies a CO ₂ -containing gas having a temperature as a first target temperature and a humidity as a first target humidity. a method of supplying ₂ containing gas, humidity and a second target temperature which is determined based on the temperature of the CO ₂ containing gas to a first target temperature and the first target humidity by cooling the CO ₂ containing gas A cooling step of 100%, and a heating step of heating the CO ₂ -containing gas after the cooling step to set the temperature of the CO ₂ -containing gas as the first target temperature and the humidity as the first target humidity. It is characterized by.

The method for supplying the carbonation-curing CO ₂ -containing gas can achieve the same effects as the carbonation-curing equipment described above.

The supply method of carbonation curing for CO ₂ containing gas according to the present invention, a constant temperature, further a certain humidity, CO ₂ containing gas supply step of supplying a CO ₂ containing gas at a constant flow rate to the CO ₂ containing gas channel provided, the cooling step cools the CO ₂ containing gas by heat exchange with a CO ₂ containing gas supplying cooling medium constant temperature in the cooling medium channel passing through the cooling medium and CO ₂ containing gas flow passage, heating step, supplying a heating medium of a predetermined temperature in the heating medium passage, by heat exchange with a CO ₂ containing gas passing through the heating medium and CO ₂ containing gas channel, heating the CO ₂ containing gas Are preferred.

The method of supplying the carbonation curing for CO ₂ containing gas, can provide the same effect as carbonation curing equipment with simple heat exchange structure using the supply unit and the aforementioned flow path.

According to the present invention, in carbonation curing using exhaust gas from the outside, a CO ₂ -containing gas is supplied at a temperature and humidity optimum for carbonation curing without a large amount of power consumption and CO ₂ emission. Can do.

It is a figure which shows the carbonation curing equipment which concerns on embodiment. A feed flow and procedure of the preparation stage carbonation curing for CO ₂ containing gas.

  Hereinafter, an embodiment of a carbonation curing facility will be described with reference to the drawings.

As shown in FIG. 1, the carbonation curing equipment 1 includes a CO ₂ -containing gas supply unit 10, a heat exchange unit 20, a CO ₂ -containing gas discharge unit 30, and a carbonation curing unit 40. The carbonation curing equipment 1 is an equipment that uses the exhaust gas from the external exhaust gas generation unit 2 as a CO ₂ -containing gas for carbonation curing of concrete. The carbonation curing equipment 1 according to the present embodiment has a simple heat exchange structure using a constant temperature cooling medium / heating medium obtained from the outside without performing complicated control during startup. carbonation curing with CO ₂ containing gas humidity are possible.

The CO ₂ -containing gas supply unit 10 supplies the exhaust gas generated in the exhaust gas generation unit 2 to the heat exchange unit 20. The heat exchange unit 20 uses the exhaust gas supplied from the CO ₂ -containing gas supply unit 10 as a CO ₂ -containing gas having a temperature and humidity optimal for carbonation curing. The CO ₂ containing gas discharge unit 30 supplies the carbonation containing unit 40 with the CO ₂ containing gas having the temperature and humidity optimum for the carbonation curing from the heat exchange unit 20. The carbonation curing unit 40 performs carbonation curing using the CO ₂ -containing gas generated by the heat exchange unit 20.

The exhaust gas generating unit 2 generates exhaust gas containing CO ₂ and is provided outside the carbonation curing equipment 1. The exhaust gas discharged from the exhaust gas generator 2 is discharged at a constant temperature and a constant humidity. Note that the CO ₂ concentration of the exhaust gas is also discharged in a constant state. Further, from the exhaust gas generation unit 2, it is possible to obtain industrial water that can be used as a constant temperature cooling medium, and it is possible to obtain factory supply steam that can be used as a constant temperature heating medium. Exhaust gas generator 2 is not particularly limited as long as it discharges CO ₂ containing gas containing CO _2, for example, thermal power plants, and the like chemical plants. Thermal power plants may have different exhaust gas temperatures and humidity depending on the power generation process in each region. Industrial water and factory-supplied steam can be obtained. The exhaust gas generation unit 2 supplies the generated exhaust gas to the CO ₂ containing gas supply unit 10 via the supply line L1. Further, the exhaust gas generator 2 supplies industrial water to the heat exchange unit 20 via the supply line L2, and supplies in-factory supply steam to the heat exchange unit 20 via the supply line L3. The supply lines L1, L2, and L3 are configured by piping covered with a heat insulating material, and the temperatures of the exhaust gas being supplied, industrial water, and factory supply steam are kept constant.

The CO ₂ -containing gas supply unit 10 functions to supply the exhaust gas supplied from the exhaust gas generation unit 2 to the CO ₂ -containing gas flow path 21 of the heat exchange unit 20 as a CO ₂ -containing gas for carbonation curing. have. The CO ₂ -containing gas supply unit 10 supplies the CO ₂ -containing gas flow path 21 with a CO ₂ -containing gas having a constant temperature, a constant humidity, and a constant flow rate. The temperature of the CO ₂ -containing gas is about 60 to 150 ° C., the humidity is about 5 to 30% RH, and the CO ₂ concentration is about 10 to 20%. Specifically, the CO ₂ -containing gas supply unit 10 includes a CO ₂ -containing gas supply path 12 and a blower 11. Blower 11 supplies the CO ₂ containing gas in the state of constant temperature and constant humidity at a constant flow rate, through a CO ₂ containing gas supply passage 12 to the CO ₂ containing gas channel 21 of the heat exchange unit 20.

The heat exchange unit 20 has a function of adjusting a high-temperature CO ₂ -containing gas to a final target temperature / target humidity (ie, temperature / humidity optimum for carbonation curing) by heat exchange. The heat exchange unit 20, the high-temperature CO ₂ containing gas supplied from the CO ₂ containing gas supply unit 10, after removing the water by further continued cooling to a predetermined temperature with time to 100% humidity and cooling By heating again, a CO ₂ -containing gas having a final target temperature and target humidity can be obtained. Since the predetermined temperature related to cooling can be uniquely determined from the final target temperature and target humidity, it can be set in advance as the target temperature for cooling. In the following description, the final target temperature / target humidity is referred to as “first target temperature / first target humidity”, and the cooling target temperature is referred to as “second target temperature”. The first target temperature is preferably about 40 to 60 ° C, and more preferably about 50 ° C. The first target humidity is preferably about 30 to 60% RH, and more preferably 40% RH.

The heat exchange unit 20 includes a CO ₂ -containing gas flow path 21, a cooling unit 22, a demister 23, a heating unit 24, and a heat insulating unit 25. CO ₂ containing gas channel 21 is a flow path that CO ₂ containing gas supplied from the CO ₂ containing gas supply unit 10 passes, passes through the cooling unit 22, demister 23 and the heating unit 24,. The demister 23 has a function of removing mist in the CO ₂ -containing gas. The heat insulation part 25 is installed so as to cover the entire heat exchange unit 20, and has a function of blocking external temperature and humidity in the process of heat exchange.

The cooling unit 22 has a function of cooling the CO ₂ -containing gas passing through the CO ₂ -containing gas flow path 21 by exchanging heat with the cooling medium, and the temperature of the CO ₂ -containing gas is set to the second target. Temperature and humidity are 100%. For the cooling unit 22, for example, a plate fin cooler is used. Specifically, the cooling unit 22 includes a cooling medium supply unit 220, a cooling medium inflow unit 221, a cooling medium flow path 222, and a cooling medium discharge unit 223. The cooling medium supply unit 220 supplies a cooling medium having a constant temperature to the cooling medium flow path 222 through the cooling medium inflow unit 221 at a constant flow rate. As the cooling medium, industrial water obtained from the exhaust gas generator 2 can be used. In addition to the industrial water obtained from the exhaust gas generator 2, water obtained from other sources may be used as the cooling medium as long as it has a constant temperature. The temperature of the cooling medium is about 5 to 30 ° C., and the flow rate is about 0.5 to ³ m ³ / Hr. The cooling medium flow path 222 allows the cooling medium to pass therethrough. A cooling medium passing through the cooling medium flow path 222, by heat exchange with a CO ₂ containing gas in the CO ₂ containing gas channel 21, to cool the CO ₂ containing gas. The cooling medium flow path 222 is configured to repeatedly meander or turn around the CO ₂ -containing gas flow path 21. In addition, by providing a plurality of fins in the CO ₂ -containing gas flow path 21, heat exchange is efficiently performed between the CO ₂ -containing gas and the cooling medium. The cooling medium discharge unit 223 discharges the cooling medium that has exchanged heat with the CO ₂ -containing gas to the outside.

Accordingly, CO ₂ containing gas, enters the cooling section 22 at a high temperature, the temperature is lowered by being cooled, the humidity rises accordingly. When cooled to a certain temperature, the CO ₂ -containing gas reaches a humidity of 100% in the middle of the cooling unit 22. Thereafter, the temperature of the CO ₂ -containing gas decreases while excess moisture is removed as water droplets while the humidity is 100%. When leaving the cooling section 22, the CO ₂ -containing gas is in a state of the second target temperature / humidity of 100%. As described above, in order to set the CO ₂ -containing gas as the second target temperature, based on the temperature, humidity, and flow rate of the supplied CO ₂ -containing gas and the temperature and flow rate of the cooling medium to be used, the cooling unit The cooling capacity of 22 is adjusted. The cooling capacity can be adjusted by, for example, the pattern of the cooling medium flow path 222, the number of fins in the CO ₂ -containing gas flow path 21, and the design of the fin material.

Heating unit 24, the CO ₂ containing gas passing through the CO ₂ containing gas channel 21, and has a function of heating by bringing a heating medium and the heat exchanger. The heating unit 24 sets the temperature of the CO ₂ -containing gas as the first target temperature and the humidity as the first target humidity. For the heating unit 24, for example, an erotic fin heater is used. Specifically, the heating unit 24 includes a heating medium supply unit 240, a heating medium inflow unit 241, a heating medium channel 242, and a heating medium discharge unit 243. The heating medium supply unit 240 supplies a heating medium having a constant temperature to the heating medium flow path 242 through the heating medium inflow unit 241 at a constant flow rate. As the heating medium, in-factory supply steam obtained from the exhaust gas generator 2 can be used. In addition to the in-factory supply steam obtained from the exhaust gas generator 2, steam obtained from other sources may be used as a heating medium as long as it has a constant temperature. The temperature of the heating medium is about 80 to 200 ° C., and the flow rate is about 100 to 200 Kg / Hr. Heating medium passage 242, passed through a heating medium, a heating medium passing through a heating medium passage 242, by heat exchange with a CO ₂ containing gas in the CO ₂ containing gas channel 21, CO ₂ content Heat the gas. The heating medium flow path 242 is configured to repeatedly meander or turn around the CO ₂ -containing gas flow path 21. The heating medium discharge unit 243 discharges the heating medium that has exchanged heat with the CO ₂ -containing gas to the outside.

Accordingly, CO ₂ containing gas, enters the second target temperature and humidity heating unit 24 at 100% state, the temperature rises by being heated, the humidity is lowered accordingly. Since the second target temperature is uniquely determined from the first target temperature and the first target humidity, when the CO ₂ -containing gas that was the second target temperature is used as the first target temperature by heating, The CO ₂ -containing gas is in a state of a first target temperature and a first target humidity. As described above, in order to set the CO ₂ -containing gas to the first target temperature and the first target humidity, the heating unit 24 is designed at the time of designing the apparatus based on the flow rate of the CO ₂ -containing gas and the temperature and flow rate of the heating medium. Adjust the heating capacity. The heating capacity can be adjusted by, for example, the pattern of the heating medium flow path 242, the number of fins, the design of the fin material, and the like.

The CO ₂ -containing gas discharge unit 30 has a function of supplying the CO ₂ -containing gas having the first target temperature and the first target humidity by the heat exchange unit 20 to the carbonation curing unit 40. Specifically, the CO ₂ -containing gas discharge unit 30 includes a CO ₂ -containing gas discharge path 31 and a blower 32. The blower 32 supplies the CO ₂ -containing gas in the state of the first target temperature and the first target humidity to the carbonation curing unit 40 via the CO ₂ -containing gas discharge path 31.

As described above, since the exhaust gas generating unit 2 obtains exhaust gas having a constant temperature and a constant humidity, industrial water having a constant temperature and steam supplied in the factory, the CO ₂ -containing gas supply unit 10 has a constant temperature and a constant humidity. The CO ₂ -containing gas can be supplied to the CO ₂ -containing gas channel 21, the cooling medium supply unit 220 can supply the cooling medium at a constant temperature to the cooling medium channel 222, and the heating medium supply unit 240 can be supplied at a constant temperature. The heating medium can be supplied to the heating medium flow path 242. Here, when viewed over a long period of one year, the temperature / humidity of the exhaust gas and the temperature of each medium may change depending on the season (for example, the temperature decreases in winter). However, “constant” in the present embodiment is not based on such a long period, but is based on a short period such as an operation cycle for starting and stopping the carbonation curing equipment 1. That is, the condition where the temperature / humidity of the exhaust gas and the temperature of each medium do not fluctuate so much as to affect the operating conditions during the operation of the carbonation curing equipment 1 is defined as “constant”. However, since each supply part 10,220,240 supplies what was obtained from the exhaust gas generation part 2 as it is (without temperature control with a heater, a cooler, etc.), it is slight temperature and humidity of an error grade. However, it is assumed that such a fluctuation that does not affect the operating condition is within the range of “constant” in the present embodiment. If the temperature and humidity of the exhaust gas deviate from what was assumed at the time of design due to seasonal fluctuations, it is possible to obtain the desired temperature and humidity of the CO ₂ -containing gas by adjusting the flow rate of the cooling medium and heating medium. is there.

Next, with reference to FIG. 2, illustrating the supply flow of carbonation curing for CO ₂ containing gas and the procedure for its preparation stage.

As shown in FIG. 2, a process is started from installation of the carbonation curing equipment 1 (step S100). In this step, the carbonation curing equipment 1 is designed and manufactured so as to obtain a desired first target temperature and first target humidity in accordance with the exhaust gas generation section 2 that is the source of the exhaust gas. This is a step of installing the carbonation curing equipment 1 in the vicinity of the gas generator 2. As design conditions, the temperature / humidity / flow rate of the exhaust gas supplied from the CO ₂ -containing gas supply unit 10, the temperature / flow rate of the cooling medium (industrial water) supplied from the cooling medium supply unit 220, and the heating medium supply unit 240 The temperature and flow rate of the supplied heating medium (factory steam) can be obtained. Further, the first target temperature and the first target humidity are determined based on under what conditions carbonation curing is performed.

Here, as an example, the temperature of the exhaust gas supplied from the CO ₂ -containing gas supply unit 10 is 85 ° C., the humidity is 16.9% RH, the flow rate is 240 m ³ / Hr (at 50 ° C.), and supplied from the cooling medium supply unit 220. The cooling medium temperature is 25 ° C., the flow rate is 2.08 m ³ / Hr, the heating medium temperature supplied from the heating medium supply unit 240 is 170 ° C., the flow rate is 2.1 Kg / Hr, and the first target temperature is A case where the temperature is 50 ° C. and the first target humidity is 50% will be described.

First, the second target temperature is set from the first target temperature and the first target humidity. Since the saturated water vapor amount at the first target temperature of 50 ° C. is 82.86 g / m ³ , the water vapor amount at the first target humidity of 50% is 41.43 g / m ³ . When the CO ₂ -containing gas is at the second target temperature, the humidity is 100%, that is, the saturated water vapor amount. Therefore, the saturated water vapor amount at the second target temperature is the water vapor amount (41. 43 g / m ³ ). From this, the second target temperature is calculated to be approximately 36 ° C.

Next, the cooling capacity of the cooling unit 22 is set. Now, the temperature of the exhaust gas supplied from the CO ₂ containing gas supply unit 10 is 85 ° C., the humidity is 16.9% RH, the flow rate is 240 m ³ / Hr (at 50 ° C.), and the cooling supplied from the cooling medium supply unit 220. The temperature of the medium is 25 ° C., and the flow rate is 2.08 m ³ / Hr. The second target temperature is set to 36 ° C. Therefore, by heat exchange with the CO ₂ containing gas in the cooling medium and the CO ₂ containing gas channel 21 through the cooling medium flow path 222, CO ₂ containing gas was 85 ° C. the second target temperature The cooling capacity of the cooling unit 22 is set so as to be 36 ° C. Specifically, the cooling capacity of the cooling unit 22 is adjusted by adjusting the flow path pattern of the cooling medium flow path 222 and the number of fins in the CO ₂ -containing gas flow path 21. Note that the amount of water vapor at a temperature of 85 ° C. and a humidity of 16.9% RH is 59.45 g / m ^3, which is larger than the saturated water vapor amount at 36 ° C., which is the second target temperature. The humidity of the CO ₂ -containing gas after cooling is 100%.

Next, the heating capacity of the heating unit 24 is set. Now, the CO ₂ -containing gas is cooled by the cooling unit 22 and becomes the second target temperature (36 ° C.) / Humidity 100%. The temperature of the heating medium supplied from the heating medium supply unit 240 is 170 ° C., and the flow rate is 2.1 Kg / Hr. Therefore, by heat exchange with a CO ₂ containing gas after cooling in the heat medium flowing through the heating medium flow path 242 and the CO ₂ containing gas channel 21, a second target temperature (36 ° C.) · 100% humidity The heating capacity of the heating unit 24 is set so that the CO ₂ -containing gas that has been obtained has the first target temperature (50 ° C.) and the first target humidity (50%). Specifically, the heating capacity setting of the heating unit 24 is performed by adjusting the flow path pattern of the heating medium flow path 242.

  The setting of the cooling capacity and heating capacity of the carbonation curing equipment 1 is thus completed, and the carbonation curing equipment 1 can be installed.

Next, preparation for starting the carbonation curing equipment 1 is performed (step S110). Setting of the cooling capacity of the cooling unit 22 and the heating capacity of the heating unit 24 so that a CO ₂ -containing gas having a desired first target temperature and first target humidity can be obtained when the carbonation curing equipment 1 is installed. Therefore, basically, no special work is required for the start-up preparation of the carbonation curing equipment 1. However, if the temperature / humidity of the exhaust gas or the temperature of industrial water and factory supply steam deviates from what was assumed due to seasonal fluctuations, the flow rate of the cooling medium and heating medium should be adjusted to It is necessary to obtain a CO ₂ -containing gas having one target temperature and first target humidity.

After completion of the startup preparation, the CO ₂ -containing gas is supplied to the heat exchange unit 20 (step S120). The exhaust gas generated in the exhaust gas generation unit 2 is transferred to the heat exchange unit 20 through the CO ₂ -containing gas supply path 12 by the blower 11 of the CO ₂ -containing gas supply unit 10 at a constant temperature, a constant humidity, and a constant flow rate. Supplied. The exhaust gas generation unit 2 to the heat exchange unit 20 are piped in a state close to heat insulation.

The CO ₂ -containing gas supplied to the heat exchange unit 20 is cooled by exchanging heat with the cooling medium (step S130). By the cooling, the temperature of the CO ₂ -containing gas becomes the second target temperature and the humidity becomes 100%. Note that the cooling medium that has exchanged heat with the CO ₂ -containing gas is discharged from the cooling medium discharge unit 223 as needed, so that the cooling medium supply unit 220 performs cooling so that the flow rate in the cooling medium flow path 222 is constant. The cooling medium is continuously supplied to the medium inflow portion 221.

The CO ₂ -containing gas whose temperature has reached the second target temperature and humidity of 100% is then mist removed by the cooling unit 22 (step S140).

The CO ₂ -containing gas after mist removal is heated by exchanging heat with the heating medium (step S150). By heating the CO ₂ -containing gas having a second target temperature and a humidity of 100% to the first target temperature, the humidity also becomes the first target humidity, and the desired first target temperature / first A CO ₂ -containing gas having a target humidity can be obtained. Note that the heating medium that has exchanged heat with the CO ₂ -containing gas is discharged from the heating medium discharge unit 243 at any time, so that the heating medium supply unit 240 performs heating so that the flow rate in the heating medium flow path 242 is constant. The heating medium is continuously supplied to the medium inflow portion 241.

The CO ₂ -containing gas that has reached the first target temperature and the first target humidity is supplied to the carbonation curing unit 40 (step S160). The CO ₂ -containing gas that is the first target temperature and the first target humidity is discharged from the heat exchange unit 20 to the CO ₂ -containing gas discharge path 31, pumped by the blower 32, and supplied to the carbonation curing unit 40. The

The above is the feed flow of carbonation curing for CO ₂ containing gas and procedures of its preparation stage. The carbonation curing unit 40 performs the carbonation curing using the CO ₂ -containing gas continuously supplied from the heat exchange unit 20.

  Next, the operation and effect of the carbonation curing equipment 1 according to this embodiment will be described.

In this carbonation curing equipment 1, in order to obtain a CO ₂ -containing gas having an optimum temperature (first target temperature) and optimum humidity (first target humidity) for carbonation curing, the CO ₂ -containing gas is cooled. And a heating unit 24 for heating the CO ₂ -containing gas cooled by the cooling unit 22. The cooling unit 22 performs heat exchange between the cooling medium and the CO ₂ -containing gas while discharging moisture so that the second target temperature is uniquely determined from the first target temperature and the first target humidity. The heat exchange between the heating medium and the CO ₂ -containing gas is performed so that the first target temperature and the first target humidity are obtained. When a CO ₂ -containing gas is obtained from the outside at a constant temperature and a constant humidity, and a cooling medium and a heating medium having a constant temperature are obtained, the cooling capacity of the cooling unit 22 is set according to those conditions when the carbonation curing equipment 1 is installed. and by setting the heating capacity of the heating unit 24, during operation with their CO ₂ containing gas and the medium, the first target temperature only by heat exchange between the medium and the CO ₂ containing gas, the A CO ₂ -containing gas having a target humidity can be obtained. As a result, CO ₂ for carbonation curing can be easily performed by using a simple heat exchange structure using a flow path and a supply unit without involving a large amount of power consumption and CO ₂ emission by complicated temperature control and humidity control. A contained gas can be obtained.

In the carbonation curing using the carbonation curing equipment 1, it is necessary to stably obtain a cooling medium and a heating medium having a constant temperature. However, when the exhaust gas generating unit 2 is normally operated, the constant temperature is continuously maintained. Since the industrial water and the steam supplied in the factory are discharged, the cooling medium and the heating medium having a constant temperature can be stably obtained by using them as the cooling medium and the heating medium. Further, since the medium discharged during the operation of the exhaust gas generator 2 is used as a cooling medium and a heating medium, there is no need to prepare a cooling medium and a heating medium, and the CO ₂ containing gas for carbonation curing is economically provided. Can be obtained.

In addition, if the exhaust gas temperature / humidity, industrial water, or factory supply steam temperature deviates from the expected values due to seasonal fluctuations, it can be easily adjusted by adjusting the flow rate of the cooling medium and heating medium. it can be obtained carbonation curing for CO ₂ containing gas. That is, it is possible to supply a carbon dioxide-containing CO ₂ -containing gas according to the seasonal variation of the environmental temperature.

Furthermore, the carbonation rate in the carbonation curing is not slowed by using the means for obtaining the CO ₂ -containing gas in the heat exchange structure. That is, it becomes possible to simultaneously remove SOx in the process of removing excess moisture by cooling, so that a CO ₂ -containing gas having a temperature and humidity optimum for carbonation curing has a low SOx concentration and a carbonation rate. Can be brought into a state where it does not decrease. Thereby, the carbonation curing equipment 1 can improve the efficiency of carbonation curing.

1 ... carbonation curing equipment, 2 ... exhaust gas generator, 10 ... CO ₂ containing gas supply unit, 11 ... blower, 12 ... CO ₂ containing gas supply passage, 20 ... heat exchanger unit, 21 ... CO ₂ containing gas channel , 22 ... cooling unit, 23 ... demister, 24 ... heating section, 25 ... heat insulating portion, 30 ... CO ₂ containing gas outlet, 31 ... CO ₂ containing gas discharge passage, 32 ... blower, 40 ... carbonation curing unit, 220 ... Cooling medium supply part, 221 ... Cooling medium inflow part, 222 ... Cooling medium flow path, 223 ... Cooling medium discharge part, 240 ... Heating medium supply part, 241 ... Heating medium inflow part, 242 ... Heating medium flow path, 243 ... Heating medium discharge section, L1 ... exhaust gas supply line, L2 ... industrial water supply line, L3 ... factory supply steam supply line.

Claims (4)

A carbonation curing facility for performing carbonation curing with a CO ₂ -containing gas containing CO ₂ having a temperature as a first target temperature and a humidity as a first target humidity,
By cooling the CO ₂ -containing gas, the CO and temperature of ₂ containing gas and a second target temperature determined based on the first target temperature and the first target humidity, the cooling unit for the humidity 100% When,
After cooling in the cooling unit, by heating the CO ₂ -containing gas, a heating unit having the temperature of the CO ₂ -containing gas as the first target temperature and the humidity as the first target humidity, Carbonation curing equipment characterized by comprising. And CO ₂ containing gas flow passage through which the said CO ₂ containing gas,
Said CO ₂ containing gas channel, constant temperature, constant humidity, further and a CO ₂ containing gas supply unit for supplying the CO ₂ containing gas at a constant flow rate,
The cooling unit has a cooling medium flow path and a cooling medium supply unit,
The cooling medium flow path performs cooling by allowing the cooling medium to pass through and exchanging heat between the cooling medium and the CO ₂ -containing gas.
The cooling medium supply unit supplies the cooling medium having a constant temperature to the cooling medium flow path,
The heating unit has a heating medium flow path and a heating medium supply unit,
The heating medium flow path performs heating by allowing the heating medium to pass through and exchanging heat between the heating medium and the CO ₂ -containing gas.
The heating medium supply unit supplies the heating medium having a constant temperature to the heating medium flow path;
The carbonation curing equipment according to claim 1. A method for supplying a CO ₂ -containing gas for carbonation curing, which supplies a CO ₂ -containing gas having a temperature as a first target temperature and a humidity as a first target humidity,
By cooling the CO ₂ containing gas, the CO ₂ containing gas temperature to a second target temperature determined based on the first target temperature and the first target humidity, the cooling step of the humidity 100% When,
Heating the CO ₂ -containing gas after the cooling step, thereby setting the temperature of the CO ₂ -containing gas as the first target temperature and the humidity as the first target humidity,
Supply method of carbonation curing for CO ₂ containing gas, wherein. Constant temperature, constant humidity, further comprising a CO ₂ containing gas supply step of supplying a CO ₂ containing gas at a constant flow rate to the CO ₂ containing gas flow passage,
Said cooling step, by supplying the cooling medium constant temperature in the cooling medium flow path, the cooling medium and the CO ₂ containing gas flow passage by heat exchange with the CO ₂ containing gas passing through the CO ₂ content Cool the gas,
The heating step supplies a heating medium at a constant temperature in the heating medium passage, the heating medium and the CO ₂ containing gas channel between the CO ₂ containing gas passing through the by heat exchange, the CO ₂ content Heating the gas,
The method for supplying a CO ₂ -containing gas for carbonation curing according to claim 3.

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