JP2023072729A - carbon dioxide supply system - Google Patents

Abstract

To provide a carbon dioxide supply system that can effectively utilize carbon dioxide while suppressing an increase of an equipment cost.SOLUTION: A carbon dioxide supply system comprises: a carbon dioxide separation/recovery appliance 21 which separates and recovers carbon dioxide from exhaust gas containing carbon dioxide discharged from a combustion apparatus arranged in a predetermined appliance; a carbon dioxide mixer 23 which mixes carbon dioxide separated and recovered by the carbon dioxide separation/recovery appliance 21 into used cooling water discharged from a cooling device arranged in the predetermined appliance; and a feeding piping installation 25 which feeds the cooling water into which carbon dioxide was mixed in the carbon dioxide mixer 23 to a farm 31 of aquatic plants or algae through piping.SELECTED DRAWING: Figure 1

Description

TECHNICAL FIELD The present disclosure relates to a carbon dioxide supply system used for culturing aquatic plants or algae.

In recent years, the reduction of carbon dioxide in the atmosphere has become an issue for the suppression of global warming. Patent Document 1 describes a method of recovering carbon dioxide from exhaust gas generated by a boiler in a thermal power plant or the like, mixing the carbon dioxide with pumped seawater, and then dumping it into the deep sea.

On the other hand, in Patent Document 2, salt water is pumped up from at least one water source of seafloor groundwater and deep sea water and introduced into a gas mixing section, and a gas containing carbon dioxide is mixed with the salt water in this gas mixing section, and this gas is The introduction of a mixed salt solution into a growth tank is described. Growing marine organisms for aquaculture purposes in a nursery. It is described that carbon dioxide gas discharged from a thermal power plant or the like can be used as the carbon dioxide.

JP-A-3-188924 JP 2019-50782 A

In the case of Patent Literature 1, effective utilization of carbon dioxide gas is not attempted. On the other hand, in the case of Patent Document 2, carbon dioxide gas is used for cultivating marine organisms, and effective utilization of carbon dioxide gas is attempted. etc. is required.

The present disclosure has been made to solve the above problems, and aims to provide a carbon dioxide supply system capable of suppressing an increase in equipment cost and effectively using carbon dioxide.

In order to achieve the above object, a carbon dioxide supply system according to an aspect of the present disclosure is a carbon dioxide separation and recovery system that separates and recovers carbon dioxide from exhaust gas containing carbon dioxide discharged from a combustion device disposed within a predetermined facility. equipment, a carbon dioxide mixer for mixing the carbon dioxide separated and recovered by the carbon dioxide separation and recovery equipment with used cooling water discharged from a cooling device disposed within the predetermined facility, and the carbon dioxide mixing device. a supply piping facility for supplying cooling water mixed with carbon dioxide in the vessel through piping to the aquatic plant or algae farm.

The present disclosure has the configuration described above, and has the effect of being able to provide a carbon dioxide supply system capable of suppressing an increase in equipment cost and effectively utilizing carbon dioxide.

FIG. 1 is a schematic diagram of an example of a carbon dioxide supply system in this embodiment.

Preferred embodiments of the present disclosure will be described below with reference to the drawings. Note that the present disclosure is not limited to the following embodiments.

(embodiment)
FIG. 1 is a schematic diagram of an example of a carbon dioxide supply system in this embodiment. At least a portion of this carbon dioxide supply system 20 is installed in the thermal power plant 10, which is a predetermined facility.

The thermal power plant 10 includes a boiler 11 as a combustion device, a steam turbine 12, a generator 13, a condenser 14 as a cooling device, a seawater pump 15, an exhaust gas treatment facility 16, a flue 17, a chimney 18, and the like. .

The boiler 11 burns fuel and vaporizes water to generate steam. Coal, petroleum, liquefied natural gas, etc. are used as the fuel. The steam turbine 12 is driven by steam produced by the boiler 11 . The generator 13 has its own rotating shaft connected to the output shaft of the steam turbine 12, and is rotationally driven by the driving of the steam turbine 12 to generate AC power.

The condenser 14 is a surface condenser that cools the steam discharged from the steam turbine 12 by heat exchange with cooling water (seawater) and converts it into water. The water after this conversion is circulated and supplied to the boiler 11 . A seawater supply pipe P1 extending from the sea 100 is connected to the condenser 14, and seawater pumped up by a seawater pump 15 is supplied as cooling water. Also, the used cooling water that has passed through the condenser 14 is returned to the sea 100 through the seawater discharge pipe P2.

Exhaust gas generated by burning fuel in the boiler 11 is introduced into the exhaust gas treatment equipment 16 . The flue gas treatment facility 16 includes a denitrification device, an electrostatic precipitator, a desulfurization device, and the like. released into the atmosphere from

The carbon dioxide supply system 20 includes a carbon dioxide (CO ₂ ) separation and recovery facility 21, a compressor 22, a carbon dioxide mixer 23, a branch pipe P3 branched from the seawater discharge pipe P2, and a flow control installed in the middle of the branch pipe P3. A valve B1 and a supply plumbing arrangement 25 are provided. The supply piping equipment 25 is provided with a transportation piping P4, a booster pump 24, and a plurality of supply piping P5 having a flow control valve B2 on the base end side, although this is only an example.

The carbon dioxide separation and recovery equipment 21 introduces the exhaust gas discharged from the exhaust gas treatment equipment 16 to the flue 17 through the introduction pipe P6, sends the separated and recovered carbon dioxide to the pipe P8, compresses it with the compressor 22, and passes it through the pipe P9. It is supplied to the carbon dioxide mixer 23 through. In addition, the carbon dioxide separation and recovery equipment 21 sends the exhaust gas from which carbon dioxide has been removed to the pipe P7 and discharges it to the flue 17 . Here, a part of the exhaust gas discharged from the exhaust gas treatment equipment 16 is introduced into the carbon dioxide separation and capture equipment 21, but it is configured to introduce all the exhaust gas discharged from the exhaust gas treatment equipment 16. You may

The carbon dioxide separation and recovery facility 21 may be any facility that can separate and recover carbon dioxide from the exhaust gas. Known equipment can be used.

Used cooling water (seawater) that has passed through the condenser 14 is introduced into the carbon dioxide mixer 23 through a branch pipe P3 branched from the seawater discharge pipe P2. If the carbon dioxide mixer 23 can mix (dissolve or diffuse as fine bubbles) gaseous carbon dioxide introduced from the pipe P9 into the used cooling water (seawater) introduced from the branch pipe P3, Its configuration is not limited. For example, a ceramic diffuser or the like can be used. In this example, the amount of used cooling water (seawater) flowing into the carbon dioxide mixer 23 can be adjusted by the flow control valve B1 installed in the middle of the branch pipe P3.

The seawater mixed with carbon dioxide by the carbon dioxide mixer 23 is supplied to the fish farm 31 through the pipes (P4, P5) by the supply pipe system 25 . In this example, the seawater mixed with carbon dioxide by the carbon dioxide mixer 23 passes through the transportation pipe P4, is pressurized to a predetermined pressure by the boost pump 24, and is sent out to the plurality of supply pipes P5. The tip of the supply pipe P5 is led to a farm 31 installed in a predetermined area of the sea 100, and seawater mixed with carbon dioxide is supplied to the farm 31. In this example, the flow rate of seawater mixed with carbon dioxide sent from the tip of each supply pipe P5 can be adjusted by the flow control valve B2 installed in each supply pipe P5. Note that the booster pump 24 is not necessarily required, and can be installed according to the length of the transport route such as the transport pipe P4, the flow rate, and the like.

In the farm 31, for example, a farming rack 32 is installed, and seaweed such as seaweed and wakame seaweed is farmed. Since the aquaculture farm 31 is located in the sea 100, the carbon dioxide concentration in the seawater tends to vary depending on the arrangement of reefs and ocean currents. Therefore, the concentration of carbon dioxide in the seawater in the farm 31 can be averaged by adjusting the flow rate sent from each supply pipe P5 by the flow control valve B2 of each supply pipe P5. Therefore, for example, sensors for measuring the concentration of carbon dioxide in water (in seawater) are arranged at a plurality of predetermined locations (for example, near the tip of each supply pipe P5) in the farm 31 . Then, the flow rate of the flow control valve B2 of each supply pipe P5 may be adjusted based on the measurement values of each measurement sensor so that the measurement values of all the measurement sensors are averaged.

In the present embodiment, carbon dioxide contained in the exhaust gas of the thermal power plant 10 is separated and recovered by the carbon dioxide separation and recovery equipment 21, and discharged from the condenser 14 in the thermal power plant 10 by the carbon dioxide mixer 23. mixed with used cooling water. By supplying the cooling water mixed with carbon dioxide to the seaweed farm 31 through the supply piping equipment 25, it is possible to promote the growth of the seaweed in the farm 31 and improve the productivity. In addition, by mixing the carbon dioxide recovered by the carbon dioxide separation and recovery equipment 21 with the used cooling water discharged from the condenser 14 in the thermal power plant 10, it is used for mixing carbon dioxide. There is no need to separately prepare water, and equipment for that purpose can be omitted. Therefore, it is possible to effectively utilize carbon dioxide while suppressing an increase in equipment cost.

In addition, by adjusting the flow rate of seawater flowing into the carbon dioxide mixer 23 with the flow control valve B1, the carbon dioxide concentration of the seawater supplied to the farm 31 from the tip of each supply pipe P5 can be adjusted. . Since the preferred amount of carbon dioxide that contributes to photosynthesis varies depending on the growth state of the seaweed cultivated in the farm 31 and day and night, the carbon dioxide concentration can be adjusted according to the preferred amount.

In this embodiment, sea water is used as the cooling water for the condenser 14, but fresh water (industrial water) may be used. When fresh water is used, the farm 31 may be located in the sea, rivers, or lakes. Also, the farm 31 may be artificially installed on land. Thus, the farm 31 may be a farm that cultivates aquatic plants or algae. Both aquatic plants and algae include those that grow in freshwater and those that grow in seawater.

Further, in the present embodiment, the thermal power plant 10 has been described as an example of the predetermined facility, but the present invention is not limited to this. Any facility that includes a combustion device that generates exhaust gas containing carbon dioxide and a cooling device that discharges used cooling water may be used, such as a cement factory or an ironworks. In the case of a cement factory, a rotary kiln for firing cement raw materials to produce clinker can be exemplified as a combustion device, and a cooling device cools high-temperature cement by heat exchange with cooling water (industrial water). An example is a cement cooling device that In the case of an ironworks, a blast furnace for heat-treating iron ore can be exemplified as a combustion device, and a heat exchanger for cooling production equipment such as a blast furnace by heat exchange with cooling water is used as a cooling device. can be exemplified.

From the above description, many modifications and other embodiments of this disclosure will be apparent to those skilled in the art. Accordingly, the above description is to be construed as illustrative only and is provided for the purpose of teaching those skilled in the art the best mode of carrying out the disclosure. Substantial details of its construction and/or function may be changed without departing from the spirit of the disclosure.

(summary)
A carbon dioxide supply system according to an aspect of the present disclosure includes carbon dioxide separation and recovery equipment for separating and recovering carbon dioxide from exhaust gas containing carbon dioxide discharged from a combustion device disposed in a predetermined facility, and the carbon dioxide separation and recovery equipment. a carbon dioxide mixer that mixes the carbon dioxide separated and collected by the facility with the used cooling water discharged from the cooling device arranged in the predetermined facility;
and supply piping equipment for supplying cooling water mixed with carbon dioxide in the carbon dioxide mixer to an aquatic plant or algae farm through piping.

According to this configuration, the carbon dioxide separation and recovery equipment separates and recovers the carbon dioxide contained in the exhaust gas discharged from the combustion device in the predetermined facility, and the carbon dioxide mixer discharges it from the cooling device in the predetermined facility. mixed with used cooling water. By supplying the cooling water mixed with carbon dioxide to the aquatic plant or algae farm through the supply piping equipment, the growth of the aquatic plant or algae in the farm can be promoted, and the productivity can be improved. . In addition, the water (seawater or freshwater ) need not be prepared separately, and equipment for that purpose can be omitted. Therefore, it is possible to effectively utilize carbon dioxide while suppressing an increase in equipment cost.

The predetermined facility includes a boiler, a steam turbine driven by the steam generated by the boiler, a generator driven by the steam turbine, and the steam from the steam turbine cooled with seawater to form water. A thermal power plant comprising: a condenser that circulates to a boiler; and an exhaust gas treatment facility that introduces exhaust gas generated in the boiler, performs denitrification, dust collection, and desulfurization and discharges the exhaust gas, and the combustion device includes: The boiler, the cooling device is the condenser using seawater as the cooling water, and the carbon dioxide separation and recovery equipment introduces exhaust gas discharged from the exhaust gas treatment equipment to separate and recover carbon dioxide. It may be configured to

The supply piping equipment may be configured to supply cooling water mixed with carbon dioxide in the carbon dioxide mixer to the farm installed in the sea.

10 Thermal power plant 11 Boiler 12 Steam turbine 13 Generator 14 Condenser 20 Carbon dioxide supply system 21 Carbon dioxide separation and capture equipment 23 Carbon dioxide mixer 25 Supply piping equipment

Claims (3)

a carbon dioxide separation and recovery facility for separating and recovering carbon dioxide from exhaust gas containing carbon dioxide discharged from a combustion device disposed in a predetermined facility;
a carbon dioxide mixer that mixes the carbon dioxide separated and recovered by the carbon dioxide separation and recovery facility with used cooling water discharged from a cooling device arranged in the predetermined facility;
supply piping equipment for supplying cooling water mixed with carbon dioxide in the carbon dioxide mixer to an aquatic plant or algae farm through piping;
Carbon dioxide supply system with The predetermined facility is
a boiler, a steam turbine driven by the steam generated by the boiler, a generator driven by the steam turbine, and a steam generator that cools the steam of the steam turbine with seawater to turn it into water and circulates it to the boiler. A thermal power plant comprising a water vessel and an exhaust gas treatment facility for introducing exhaust gas generated in the boiler, performing denitrification, dust collection and desulfurization and discharging the exhaust gas,
The combustion device is the boiler,
The cooling device is the condenser using seawater as the cooling water,
The carbon dioxide separation and recovery equipment is configured to introduce exhaust gas discharged from the exhaust gas treatment equipment to separate and recover carbon dioxide,
The carbon dioxide supply system according to claim 1. The supply piping equipment is configured to supply cooling water mixed with carbon dioxide in the carbon dioxide mixer to the aquaculture farm installed in the sea,
The carbon dioxide supply system according to claim 1 or 2.

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