JP2021196110A - Combustion exhaust gas treatment apparatus - Google Patents

Abstract

To reduce the exhaust flow rate of combustion exhaust gas.SOLUTION: A combustion exhaust gas treatment apparatus 120 is provided with: cultivation rooms 320a to 320c in which plants are cultivated; an extracted exhaust gas supply unit 310 for extracting at least a part of a combustion exhaust gas generated in a combustion apparatus 220 to supply it to the cultivation rooms 320a to 320c as an extracted exhaust gas; and a recycle gas return unit 330 for returning at least a part of the gas in the cultivation rooms 320a to 320c to the combustion apparatus 220 as a recycle gas.SELECTED DRAWING: Figure 1

Description

The present disclosure relates to a combustion exhaust gas treatment device.

The Air Pollution Control Law, etc. stipulates the concentration of specific substances such as nitrogen oxides and sulfur oxides in the combustion exhaust gas exhausted to the atmosphere from combustion equipment such as boilers, and the flow rate of the combustion exhaust gas exhausted to the atmosphere. ..

Therefore, the combustion equipment provided with the combustion device is provided with a denitration device, a dust removal device, and a desulfurization device so that the concentration of the specific substance is lower than the concentration reference value (for example, Patent Document 1). In addition, the combustion device is designed and operated so that the exhaust flow rate of the combustion exhaust gas is lower than the flow rate reference value.

Japanese Unexamined Patent Publication No. 2004-167332

As described above, the combustion device is designed and operated so that the exhaust flow rate of the combustion exhaust gas is less than the flow rate reference value while obtaining a desired energy (calorific value) by using a predetermined fuel. However, the exhaust flow rate may increase depending on the operating conditions of the combustion device.

Therefore, in view of such a problem, the present disclosure aims to provide a combustion exhaust gas treatment device capable of reducing the exhaust gas flow rate of the combustion exhaust gas.

In order to solve the above problems, the combustion exhaust gas treatment device according to one aspect of the present disclosure extracts at least a part of the combustion exhaust gas generated in the cultivation room in which the plant is cultivated and the combustion device, and uses it as the extracted exhaust gas in the cultivation room. It is provided with a recirculated exhaust gas supply unit for supplying the exhaust gas to the combustion device and a recirculated gas return unit for returning at least a part of the gas in the cultivation room to the combustion apparatus as the recirculated gas.

Further, the combustion exhaust gas treatment device includes an extraction control unit that controls the amount of the extracted exhaust gas extracted by the extracted exhaust gas supply unit so that the flow rate of the combustion exhaust gas guided from the combustion device to the chimney becomes less than the first predetermined value. You may.

Further, the combustion exhaust gas treatment device is provided with a plurality of cultivation rooms, and the extracted exhaust gas supplied to the plurality of cultivation rooms by the extraction exhaust gas supply unit so as to satisfy the cultivation conditions in at least one cultivation room among the plurality of cultivation rooms. A distribution control unit that controls the distribution amount may be provided.

Further, the combustion exhaust gas treatment device may include a return control unit that controls the recirculation gas return unit so that the flow rate of the recirculation gas returned to the combustion device is equal to or less than the second predetermined value.

According to the present disclosure, it is possible to reduce the exhaust flow rate of the combustion exhaust gas.

It is a figure explaining the combustion system of embodiment.

Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. The dimensions, materials, and other specific numerical values shown in the embodiments are merely examples for facilitating understanding, and the present disclosure is not limited unless otherwise specified. In the present specification and the drawings, elements having substantially the same function and configuration are designated by the same reference numerals, so that duplicate description will be omitted. In addition, elements not directly related to the present disclosure are not shown.

[Combustion system 100]
FIG. 1 is a diagram illustrating the combustion system 100 of the present embodiment. In FIG. 1, solid arrows indicate gas flow. In FIG. 1, the dashed arrow indicates the signal flow. In FIG. 1, for ease of understanding, a broken line arrow indicating the signal flow from the central control unit 340 to the flow rate adjustment mechanisms 318a to 318c, and from the central control unit 340 to the flow rate adjustment mechanisms 334a to 334c. The dashed arrow indicating the signal flow is omitted. As shown in FIG. 1, the combustion system 100 includes a combustion facility 110 and a combustion exhaust gas treatment device 120.

[Combustion equipment 110]
The combustion equipment 110 includes a push-in ventilator 210, a combustion apparatus 220, a denitration apparatus 230, a dust removing apparatus 240, an attracting ventilator 250, a desulfurization apparatus 260, an exhaust gas measuring unit 280, and a chimney 290.

In the forced Draft Fan 210, the suction side is connected to the air (oxidizing agent) supply source through the pipe 212. The discharge side of the push-in ventilator 210 is connected to the combustion device 220 through the pipe 214. The push-in ventilator 210 supplies air or air and a recirculation gas described later to the combustion device 220.

The combustion device 220 burns fuel with air or air and recirculated gas. The combustion device 220 is, for example, a thermal boiler, a gas turbine, or a diesel engine. The fuel is, for example, petroleum, heavy oil, coal, biomass, LNG (Liquefied Natural Gas), LPG (Liquefied Petroleum Gas) and the like. The combustion exhaust gas generated in the combustion device 220 is guided to the denitration device 230 through the pipe 222.

The denitration device 230 removes nitrogen oxides (NOx) contained in the combustion exhaust gas. The denitration device 230 is connected to the dust removal device 240 through the pipe 232. The dust remover 240 removes dust contained in the combustion exhaust gas. The dust remover 240 is, for example, an electrostatic precipitator or a bug filter.

In the Induced Draft Fan 250, the suction side is connected to the dust removing device 240 through the pipe 242. The discharge side of the induced ventilator 250 is connected to the desulfurization device 260 through the pipe 252. The induction ventilator 250 sucks the combustion exhaust gas from the dust removing device 240 and guides it to the desulfurization device 260.

The desulfurization device 260 removes sulfur oxides (SOx) contained in the combustion exhaust gas. The desulfurization device 260 is connected to the chimney 290 through the pipe 262. The pipes 222, 232, 242, 252, and 262 are kept warm by the heat insulating material.

The exhaust gas measuring unit 280 measures the concentration of nitrogen oxides and the concentration of sulfur oxides in the combustion exhaust gas flowing between the connecting pipe 312 and the chimney 290 in the pipe 262, and the flow rate of the combustion exhaust gas. The chimney 290 dissipates the combustion exhaust gas led from the pipe 262 to the atmosphere.

[Combustion exhaust gas treatment device 120]
The combustion exhaust gas treatment device 120 includes a flow rate measuring unit 302, an extracted exhaust gas supply unit 310, cultivation rooms 320a to 320c, a recirculation gas return unit 330, and a central control unit 340.

The flow rate measuring unit 302 measures the flow rate of the combustion exhaust gas in the pipe 262.

The extracted exhaust gas supply unit 310 extracts at least a part of the combustion exhaust gas generated in the combustion device 220 and supplies it as the extracted exhaust gas to the cultivation chambers 320a to 320c described later. The extraction exhaust gas supply unit 310 includes a connection pipe 312, an extraction mechanism 314, a distribution pipe 316a to 316c, and a flow rate adjusting mechanism 318a to 318c.

The connection pipe 312 connects between the desulfurization device 260 in the pipe 262 and the exhaust gas measuring unit 280, and the distribution pipes 316a to 316c. The connecting pipe 312 is kept warm by the heat insulating material.

The extraction mechanism 314 is provided on the connecting pipe 312. The extraction mechanism 314 extracts the combustion exhaust gas flowing through the pipe 262 as the extracted exhaust gas. The extraction mechanism 314 is composed of, for example, an induction ventilator and a valve (valve) or a damper. The extraction mechanism 314 is controlled by an extraction control unit 342, which will be described later.

The branch pipe 316a connects the connecting pipe 312 and the cultivation room 320a. The branch pipe 316b connects the connecting pipe 312 and the cultivation room 320b. The branch pipe 316c connects the connecting pipe 312 and the cultivation room 320c. The flow rate adjusting mechanism 318a is provided in the distribution pipe 316a. The flow rate adjusting mechanism 318a adjusts the opening degree of the flow path formed in the distribution pipe 316a. The flow rate adjusting mechanism 318b is provided in the distribution pipe 316b. The flow rate adjusting mechanism 318b adjusts the opening degree of the flow path formed in the distribution pipe 316b. The flow rate adjusting mechanism 318c is provided in the distribution pipe 316c. The flow rate adjusting mechanism 318c adjusts the opening degree of the flow path formed in the distribution pipe 316c. The flow rate adjusting mechanisms 318a to 318c are composed of, for example, a valve or a damper.

The cultivation rooms 320a to 320c are substantially enclosed spaces in which plants are cultivated. The cultivation rooms 320a to 320c are, for example, a plant factory or a greenhouse. The cultivation rooms 320a to 320c are provided with an air supply device (not shown). Air is supplied from the air supply device to the cultivation rooms 320a to 320c. Further, the cultivation chambers 320a to 320c are maintained at humidity, atmospheric pressure, air volume, light amount, and wavelength of light suitable for the plants in the cultivation chambers 320a to 320c.

When the extracted exhaust gas (combustion exhaust gas) is supplied from the extracted exhaust gas supply unit 310 to the cultivation chambers 320a to 320c, the carbon dioxide contained in the extracted exhaust gas is converted into oxygen by the plants in the cultivation chambers 320a to 320c. In this way, in the cultivation chambers 320a to 320c, a gas having a higher oxygen concentration than the extracted exhaust gas is generated.

The recirculation gas return unit 330 returns at least a part of the gas in the cultivation chambers 320a to 320c to the combustion device 220 as the recirculation gas. The recirculation gas return unit 330 includes a collecting pipe 332a to 332c, a flow rate adjusting mechanism 334a to 334c, and a return pipe 336. The collecting pipe 332a connects the cultivation room 320a and the return pipe 336. The collecting pipe 332b connects the cultivation room 320b and the return pipe 336. The collecting pipe 332c connects the cultivation room 320c and the return pipe 336. The flow rate adjusting mechanism 334a is provided in the collecting pipe 332a. The flow rate adjusting mechanism 334a adjusts the opening degree of the flow path formed in the collecting pipe 332a. The flow rate adjusting mechanism 334b is provided in the collecting pipe 332b. The flow rate adjusting mechanism 334b adjusts the opening degree of the flow path formed in the collecting pipe 332b. The flow rate adjusting mechanism 334c is provided in the collecting pipe 332c. The flow rate adjusting mechanism 334c adjusts the opening degree of the flow path formed in the collecting pipe 332c. The flow rate adjusting mechanisms 334a to 334c are composed of, for example, an induction ventilator and a valve or a damper. The return pipe 336 connects the collecting pipes 332a to 332c and the pipe 212.

The central control unit 340 is composed of a semiconductor integrated circuit including a CPU (Central Processing Unit). The central control unit 340 reads a program, parameters, etc. for operating the CPU itself from the ROM. The central control unit 340 manages and controls the entire combustion exhaust gas treatment device 120 in cooperation with the RAM as a work area and other electronic circuits.

In the present embodiment, the central control unit 340 functions as an extraction control unit 342, a distribution control unit 344, and a return control unit 346.

The extraction control unit 342 controls the amount of the extracted exhaust gas extracted by the extracted exhaust gas supply unit 310 so that the flow rate of the combustion exhaust gas guided from the combustion device 220 to the chimney 290 becomes less than the first predetermined value. That is, the extraction control unit 342 controls the extraction exhaust gas supply unit 310 so that the flow rate of the combustion exhaust gas measured by the exhaust gas measurement unit 280 is less than the first predetermined value.

Specifically, the extraction control unit 342 drives the extraction mechanism 314 when the flow rate of the combustion exhaust gas measured by the flow rate measuring unit 302 is equal to or higher than the first predetermined value. The first predetermined value is a predetermined value equal to or less than the flow rate reference value specified by the Air Pollution Control Act and the like.

The distribution control unit 344 distributes the extracted exhaust gas supplied to the cultivation rooms 320a to 320c by the extraction exhaust gas supply unit 310 so as to satisfy the cultivation conditions in at least one cultivation room 320a to 320c among the cultivation rooms 320a to 320c. To control. The cultivation conditions are, for example, a carbon dioxide concentration suitable for plants cultivated in the cultivation rooms 320a to 320c. Specifically, the distribution control unit 344 adjusts one or more of the flow rate adjusting mechanisms 318a to 318c so as to be within the carbon dioxide concentration range suitable for the plants cultivated in the cultivation rooms 320a to 320c. do. Further, at this time, the distribution control unit 344 may control the air supply device.

The distribution control unit 344 closes the flow rate adjusting mechanisms 318a to 318c connected to the cultivation chambers 320a to 320c during harvesting among the cultivation chambers 320a to 320c. That is, the cultivation chambers 320a to 320c are configured so that plants are cultivated in the cultivation chambers 320a to 320c other than the cultivation chambers 320a to 320c during harvesting.

The return control unit 346 controls the recirculation gas return unit 330 so that the amount of the recirculation gas returned to the combustion device 220 is equal to or less than the second predetermined value. Specifically, the return control unit 346 adjusts the flow rate adjusting mechanisms 334a to 334c so that the amount of the recirculated gas returned to the baking apparatus 220 is equal to or less than the second predetermined value. The second predetermined value is the maximum value of the recirculated gas that the combustion device 220 can continue to burn.

As described above, the combustion exhaust gas treatment device 120 according to the present embodiment extracts the combustion exhaust gas from the upstream side of the exhaust gas measuring unit 280 in the pipe 262, and the carbon dioxide in the combustion exhaust gas (exhaust gas) is converted into oxygen by the plant. Convert. Then, the combustion exhaust gas treatment device 120 returns the recirculated gas containing oxygen converted by the plant to the combustion device 220. Therefore, the combustion exhaust gas treatment device 120 can recirculate the combustion exhaust gas to the combustion device 220, and as a result, the amount of the combustion exhaust gas emitted from the chimney 290 can be reduced.

Thereby, even if the operating conditions are not preferable, the combustion system 100 can reduce the amount of the combustion exhaust gas emitted from the chimney 290 while obtaining the desired energy.

Further, as described above, the combustion exhaust gas treatment device 120 extracts the combustion exhaust gas from the pipe 262. That is, the combustion exhaust gas treatment device 120 extracts the combustion exhaust gas from the subsequent stage of the desulfurization device 260 and supplies it to the cultivation rooms 320a to 320c. Therefore, the combustion exhaust gas treatment device 120 can supply the combustion exhaust gas having a low concentration of nitrogen oxides, dust, and sulfur oxides as the extracted exhaust gas to the cultivation chambers 320a to 320c. As a result, the combustion exhaust gas treatment device 120 can efficiently cultivate plants in the cultivation rooms 320a to 320c.

Further, the combustion exhaust gas treatment device 120 includes an extraction control unit 342. As a result, the combustion exhaust gas treatment device 120 can make the flow rate of the combustion exhaust gas emitted from the chimney 290 less than the flow rate reference value.

Further, the combustion exhaust gas treatment device 120 includes a distribution control unit 344. As a result, the combustion exhaust gas treatment device 120 can promote photosynthesis of plants in the cultivation chambers 320a to 320c. Therefore, the combustion exhaust gas treatment device 120 can efficiently cultivate plants in the cultivation chambers 320a to 320c.

Further, the combustion exhaust gas treatment device 120 includes a return control unit 346. As a result, the combustion exhaust gas treatment device 120 can maintain the combustion of the combustion device 220.

Although the embodiments have been described above with reference to the accompanying drawings, it goes without saying that the present disclosure is not limited to the above embodiments. It is clear that a person skilled in the art can come up with various modifications or modifications within the scope of the claims, and it is understood that these also naturally belong to the technical scope of the present disclosure. Will be done.

For example, in the above-described embodiment, the case where the combustion exhaust gas treatment device 120 includes the cultivation chambers 320a to 320c is given as an example. However, the combustion exhaust gas treatment device 120 may include at least one cultivation room.

Further, in the above embodiment, the carbon dioxide concentration is taken as an example as a cultivation condition. However, the cultivation conditions may be a temperature suitable for the plants cultivated in the cultivation rooms 320a to 320c.

Further, in the above embodiment, the configuration in which the combustion exhaust gas treatment device 120 includes the extraction control unit 342 is given as an example. However, the extraction control unit 342 is not an essential configuration. That is, the flow rate of the combustion exhaust gas extracted by the extracted exhaust gas supply unit 310 may be a fixed value. In this case, the fixed value may be set so that the combustion exhaust gas exhausted from the chimney 290 is always less than the first predetermined value.

Further, in the above embodiment, the configuration in which the combustion exhaust gas treatment device 120 includes the distribution control unit 344 is given as an example. However, the distribution control unit 344 is not an essential configuration. That is, the amount of the extracted exhaust gas supplied to the cultivation rooms 320a to 320c by the extracted exhaust gas supply unit 310 may be a fixed value.

Further, in the above embodiment, the configuration in which the combustion exhaust gas treatment device 120 includes the return control unit 346 is given as an example. However, the return control unit 346 is not an essential configuration. That is, the flow rate of the recirculated gas returned by the recirculated gas returning unit 330 may be a fixed value. In this case, the fixed value may be set so that the flow rate of the recirculated gas returned to the combustion device 220 is always equal to or less than the second predetermined value.

Further, in the above embodiment, the configuration in which the combustion equipment 110 includes a denitration device 230, a dust removal device 240, and a desulfurization device 260 is given as an example. However, depending on the properties of the combustion exhaust gas, the combustion equipment 110 may omit any one of the denitration device 230, the dust removal device 240, and the desulfurization device 260.

Further, in the above embodiment, the case where the extracted exhaust gas supply unit 310 extracts the combustion exhaust gas treated by the denitration device 230, the dust removing device 240, and the desulfurization device 260 has been given as an example. However, the extracted exhaust gas supply unit 310 may extract at least a part of the combustion exhaust gas generated in the combustion device 220. For example, the extracted exhaust gas supply unit 310 may extract the combustion exhaust gas before being processed by the denitration device 230. That is, the connection pipe 312 may be connected to the pipe 222. Further, the extracted exhaust gas supply unit 310 may extract the combustion exhaust gas treated by the denitration device 230. That is, the connection pipe 312 may be connected to the pipe 232. Further, the extracted exhaust gas supply unit 310 may extract the combustion exhaust gas treated by the dust removing device 240. That is, the connecting pipe 312 may be connected to the pipe 242 or the pipe 252.

The present disclosure can be used for a combustion exhaust gas treatment device.

120 Combustion exhaust gas treatment device 310 Extraction exhaust gas supply unit 320a Cultivation room 320b Cultivation room 320c Cultivation room 330 Recirculation gas return unit 342 Extraction control unit 344 Distribution control unit 346 Return control unit

Claims (4)

The cultivation room where the plants are cultivated and
An extracted exhaust gas supply unit that extracts at least a part of the combustion exhaust gas generated in the combustion device and supplies it to the cultivation room as the extracted exhaust gas.
A recirculation gas return unit that returns at least a part of the gas in the cultivation room as a recirculation gas to the combustion apparatus, and a recirculation gas return unit.
Combustion exhaust gas treatment device equipped with. The first aspect of claim 1 includes an extraction control unit that controls the amount of the extracted exhaust gas extracted by the extracted exhaust gas supply unit so that the flow rate of the combustion exhaust gas guided from the combustion device to the chimney becomes less than the first predetermined value. The described combustion exhaust gas treatment device. With multiple cultivation rooms
A distribution control unit that controls the distribution amount of the extracted exhaust gas supplied to the plurality of the cultivation chambers by the extracted exhaust gas supply unit so as to satisfy the cultivation conditions in at least one of the cultivation chambers. The combustion exhaust gas treatment device according to claim 2. 6. Combustion exhaust gas treatment equipment.

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