JP7159433B2 - Kiln and heating method - Google Patents

Description

The present invention relates to a heating device and a heating method.

2. Description of the Related Art Conventionally, a heating device that obtains heat by burning fuel is known (see, for example, Patent Document 1, etc.). The heating device described in US Pat. No. 5,300,005 includes a boiler using coal and ammonia as fuel. Patent Document 1 describes that the amount of carbon dioxide emissions can be reduced by using ammonia as part of the fuel.

JP 2016-41990 A

As described in Patent Literature 1, using ammonia as a fuel can reduce carbon dioxide emissions. However, when ammonia is used as fuel, nitrogen oxides (NOx) are generated as the ammonia burns. Since NOx is an air pollutant, there is a demand to suppress the generation of NOx even in a heating apparatus that uses ammonia as fuel and generates a small amount of carbon dioxide.

A main object of the present invention is to provide a heating apparatus and a heating method in which the generation of carbon dioxide and NOx is suppressed.

A heating device according to the present invention comprises a combustion chamber, a first supply mechanism and a second supply mechanism. A first supply mechanism supplies ammonia and oxygen to the combustion chamber. The second supply mechanism supplies other fuel, which is a carbon-containing fuel other than ammonia, and oxygen to the combustion chamber. A heating device according to the present invention is a heating device that generates heat by burning ammonia and other fuels in a combustion chamber. In the heating device according to the present invention, V01: theoretical oxygen amount (volume) required to burn ammonia supplied from the first supply mechanism and other fuel supplied from the second supply mechanism, V02: combustion Total amount of oxygen (volume) supplied to the chamber, V11: Theoretical amount (volume) of oxygen required to burn ammonia supplied from the first supply mechanism, V12: Oxygen supplied from the first supply mechanism (V12/V11)/(V02/V01) is 0.8 or more in terms of amount (volume).

The heating device according to the present invention has a tip portion positioned in the combustion chamber, and has a second flow path connected to the second supply mechanism and a first flow path connected to the first supply mechanism. may further comprise a burner having

In the heating device according to the present invention, ammonia may be supplied by the first supply mechanism out of the first and second supply mechanisms. Other fuels may be supplied by the second of the first and second supply mechanisms.

In the heating device according to the invention the other fuel may be a solid fuel, a gaseous fuel or a liquid fuel.

The heating method according to the present invention supplies ammonia and oxygen to the combustion chamber from the first supply mechanism, and supplies other fuel other than ammonia and oxygen to the combustion chamber from the second supply mechanism. It is a heating method in which heat is generated by burning in a combustion chamber. In the heating method according to the present invention, V01: theoretical oxygen amount (volume) required to burn ammonia supplied from the first supply mechanism and other fuel supplied from the second supply mechanism, V02: combustion Total amount of oxygen (volume) supplied to the chamber, V11: Theoretical amount (volume) of oxygen required to burn ammonia supplied from the first supply mechanism, V12: Oxygen supplied from the first supply mechanism Combustion is performed so that (V12/V11)/(V02/V01) becomes 0.8 or more when expressed as an amount (volume).

Advantageous Effects of Invention According to the present invention, it is possible to provide a heating device and a heating method in which the generation of carbon dioxide and NOx is suppressed.

1 is a schematic diagram of a heating device according to an embodiment of the present invention; FIG. 1 is a schematic cross-sectional view of a burner in one embodiment of the invention; FIG. FIG. 3 is a schematic cross-sectional view showing a modification of the burner of FIG. 2; It is a graph showing the relationship between (V12/V11)/(V02/V01) and NOx in each experimental example.

Embodiments of the present invention will be described below. However, the following embodiments are merely examples. The present invention is by no means limited to the following embodiments.

In each drawing referred to in the embodiments and the like, members having substantially the same functions are referred to with the same reference numerals. In addition, the drawings referred to in the embodiments and the like are described schematically. The dimensional ratios and the like of the objects drawn in the drawings may differ from the dimensional ratios and the like of the actual objects. The dimensional ratios of objects and the like may differ between drawings. Specific dimensional ratios of objects should be determined with reference to the following description.

A heating device 1 shown in FIG. 1 is a device that burns a fuel containing carbon-containing fuel and ammonia to generate heat. The heating device 1 may constitute, for example, a heating device for heating a liquid such as a boiler, or a heating device for heating a solid such as a kiln.

The heating device 1 includes a combustion chamber 10 , a combustion mechanism 20 , a first supply mechanism 30 and a second supply mechanism 40 .

The combustion chamber 10 is a room where combustion takes place and heat is generated. The heating device 1 may be configured such that the heat generated in the combustion chamber 10 is used in the combustion chamber, or may be configured such that the heat generated in the combustion chamber 10 is discharged to the outside. . For example, when the heating device 1 is a kiln, the raw material put into the combustion chamber 10 is fired by the amount of heat generated in the combustion chamber 10 .

A first supply mechanism 30 and a second supply mechanism 40 are connected to the combustion chamber 10 .

The first supply mechanism 30 supplies ammonia and oxygen to the combustion chamber 10 . However, in the present invention, the first supply mechanism may supply substances other than ammonia and oxygen to the combustion chamber. Oxygen may also be supplied as air. In this embodiment, an example in which the first supply mechanism 30 substantially supplies only ammonia and oxygen will be described.

Note that "substantially supplying only ammonia and oxygen" includes supplying impurities contained in the supplied ammonia gas and oxygen gas together with ammonia and oxygen.

The second supply mechanism 40 supplies a fuel other than ammonia (hereinafter referred to as "other fuel") and oxygen to the combustion chamber 10 . However, in the present invention, the second supply mechanism may supply something other than fuel and oxygen. In this embodiment, an example in which the second supply mechanism 40 substantially supplies only other fuel and oxygen will be described.

Note that "substantially supplying only other fuel and oxygen" includes supplying impurities contained in the other fuel gas or oxygen gas to be supplied together with the other fuel and oxygen. Oxygen may also be supplied as air.

As described above, in the present embodiment, out of the first and second supply mechanisms 30 and 40, ammonia is supplied to the combustion chamber 10 by the first supply mechanism 30, and other fuels are supplied to the combustion chamber 10 by the first and second supply mechanisms. The fuel is supplied to the combustion chamber 10 by the second supply mechanism 40 of the second supply mechanisms 30 and 40 .

Specifically, in this embodiment, the first supply mechanism 30 supplies ammonia and oxygen to the combustion mechanism 20 provided in the combustion chamber 10 . A second supply mechanism 40 supplies another fuel and oxygen to the combustion mechanism 20 . In the present invention, the first supply mechanism may directly supply ammonia and oxygen to the combustion chamber without supplying ammonia and oxygen to the combustion mechanism.

The combustion mechanism 20 burns the other fuel and at least part of the ammonia supplied from the first and second supply mechanisms 30 and 40 . Combustion of these fuels generates heat and heats up.

The combustion mechanism 20 can be constituted, for example, by a burner whose tip is located in the combustion chamber 10, as shown in FIG. Hereinafter, in this embodiment, an example in which the combustion mechanism 20 is configured by a burner will be described.

As shown in FIG. 2 , the burner that constitutes the combustion mechanism 20 has a double-pipe structure and has a first flow path 21 and a second flow path 22 . The first flow path 21 is provided around the second flow path 22 . A first supply mechanism 30 is connected to the first flow path 21 . A second supply mechanism 40 is connected to the second flow path 22 . Therefore, another fuel and oxygen are supplied from the center of the burner that constitutes the combustion mechanism 20, and ammonia and oxygen are supplied from the outside thereof.

In addition, in the present embodiment, an example in which the first flow path 21 is provided around the second flow path 22 has been described. However, in the present invention, the positional relationship between the first flow path and the second flow path is within a range in which the supply from the first flow path and the supply from the second flow path contribute to combustion. If so, it is not particularly limited. In the present invention, for example, the first flow path and the second flow path may be separated from each other.

Other raw materials may be, for example, fuels in any form of gas, liquid or solid. When the other raw material is liquid, the other liquid raw material is sprayed from the tip of the second flow path 22 . When the other raw material is solid, the other solid raw material is pulverized to, for example, about 500 μm or less, further pulverized, or slurried, and discharged from the tip of the second flow path 22. released.

Other feedstocks may be, for example, fossil fuels, waste, biomass, and the like.

Specific examples of gaseous fossil fuels include natural gas, methane hydrate, and shale gas. Other gaseous carbon-containing fuels include methane, ethane, propane, and the like.

Specific examples of liquid fossil fuels include petroleum-refined liquid fuels such as heavy oil, light oil, and gasoline, chemically synthesized liquid hydrocarbons, alcohols, and glycols.

Specific examples of solid fossil fuels include, for example, coal, petroleum coke, and coal coke. Among these, pulverized coal is preferable from the viewpoint of high volatile content and excellent combustibility.

Specific examples of waste-derived carbon-containing fuels include waste plastics, fiber scraps, paper scraps, and waste oil.

Specific examples of biomass include wood waste, coconut shells, organic sludge, food residue, animal manure, and the like.

The combustion mechanism 20 schematically shown in FIG. 2 includes a liquid carbon-containing fuel (liquid fuel) such as heavy oil, a gaseous carbon-containing fuel (gas fuel) such as propane gas, or a solid carbon-containing raw material such as pulverized coal. It is a suitable burner when using (solid fuel). The form of the combustion mechanism 20 can be appropriately selected according to the form of carbon-containing fuel to be used.

The present inventors, as a result of intensive research,
V01: theoretical oxygen amount (volume) required to burn ammonia supplied from the first supply mechanism 30 and other fuel supplied from the second supply mechanism 40;
V02: total amount of oxygen supplied to the combustion chamber (volume);
V11: theoretical oxygen amount (volume) required to burn ammonia supplied from the first supply mechanism 30;
V12: the amount (volume) of oxygen supplied from the first supply mechanism 30;
when
It was conceived that NOx generation can be suppressed by controlling (V12/V11)/(V02/V01) to be within a specific range. Specifically, the present inventors found that by setting (V12/V11)/(V02/V01) to 0.8 or more, by using ammonia, the carbon dioxide generated from the combustion of the carbon-containing fuel It was conceived that the amount of carbon generated can be suppressed and the amount of NOx generated can be significantly suppressed.

The reason for this is not clear, but by controlling (V12/V11) with respect to (V02/V01), ammonia that does not contribute to combustion has a denitration effect on NOx, reducing NOx to nitrogen gas. This is thought to be because The upper limit of (V12/V11)/(V02/V01) may be, for example, 1.3 or less from the viewpoint of suppressing the amount of NOx generated.

In the heating device 1, ammonia is used as fuel in addition to the carbon-containing fuel. Therefore, the amount of carbon-containing fuel required to generate the same amount of heat can be reduced. Therefore, the amount of carbon dioxide discharged from the heating device 1 is small. Further, in the heating device 1, combustion is performed such that (V12/V11)/(V02/V01) is 0.8 or more. Therefore, as described above, the amount of NOx generated is also suppressed. That is, in the heating device 1, the amounts of both carbon dioxide and NOx generated are suppressed.

From the viewpoint of more effectively suppressing the amount of NOx generated, (V02/V01) is preferably less than 1.2. In this case, the range of (V12/V11) in which the amount of NOx generated can be suppressed can be widened. From the viewpoint of smooth combustion of the carbon-containing fuel, (V02/V01) may be, for example, 1.0 or more, or 1.03 or more. From the viewpoint of smooth combustion of ammonia, (V12/V11) may be, for example, 0.8 or more, or may be 0.9 or more.

In this embodiment, the example in which the heating mechanism includes only the first and second supply mechanisms has been described. However, the present invention is not limited to this configuration. The heating mechanism of the present invention may further have a mechanism for supplying at least one of the combustion improver and fuel in addition to the first and second supply mechanisms. For example, the heating mechanism of the present invention may further include a third supply mechanism that supplies air in addition to the first and second supply mechanisms.

FIG. 3 is a variant of the burner shown in FIG. In this modification, a burner having a triple tube structure shown in FIG. 3 constitutes a combustion mechanism 20A. The burner of FIG. 3 has a third flow path 23 in the central part, and has a second flow path 22 and a first flow path 21 in this order from the third flow path 23 side around it. . That is, the burner of FIG. 3 has the third channel 23, the second channel 22 and the first channel 21 in this order from the inside to the outside. A first supply mechanism 30 is connected to the first flow path 21 . A second supply mechanism 40 is connected to the second flow path 22 . A third supply mechanism for supplying oxygen is connected to the third flow path 23 . Therefore, oxygen is supplied from the center of the burner constituting the combustion mechanism 20A, other fuel and oxygen are supplied from the outside thereof, and ammonia and oxygen are supplied from the outside thereof. Each oxygen may be supplied as air.

In this modified example, the combustion mechanism 20A composed of the burner having the third flow path 23, the second flow path 22 and the first flow path 21 in this order from the inside to the outside has been described. is not limited to For example, a second flow path 22 to which other fuel and oxygen are supplied is provided in the center, a third flow path 23 to which no fuel is supplied but oxygen is provided on the outside, and ammonia and oxygen are provided on the outside. A first channel 21 for supplying oxygen may be provided.

In the present invention, the ratio (calorific value basis) of ammonia and other fuel supplied to the combustion chamber 10 is not particularly limited, but ammonia:other fuel is, for example, 1:99 to 50:50. Preferably.

In the present invention, the NOx concentration contained in the exhaust gas from the combustion chamber is preferably 1700 ppm or less, more preferably 1500 ppm or less, and even more preferably 1000 ppm or less. The CO ₂ concentration contained in the exhaust gas from the combustion chamber is preferably 14% by volume or less, more preferably 13% by volume or less. Preferably, the exhaust gas from the combustion chamber is substantially free of ammonia, more preferably free of ammonia.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments.

Hereinafter, the present invention will be described in more detail based on specific experimental examples, but the present invention is not limited to the following examples at all, and can be carried out with appropriate modifications within the scope of not changing the gist thereof. It is possible to

(Experimental example 1-1)
Equipped with a heavy oil combustion burner (outer diameter 78 mm) having a first flow path, a second flow path and a third flow path as shown in FIG. Combustion experiments were conducted using a chamber under the following conditions. Ammonia and air (the amount of oxygen contained therein is V12) were supplied from the first supply mechanism to the first flow path, and A heavy oil and air were supplied from the second supply mechanism to the second flow path. In addition, only air was supplied to the third channel. Ammonia and A heavy oil were burned in this way. The NOx concentration in the exhaust gas generated at that time was measured using a nitrogen oxide/oxygen automatic measuring device ECL-88A Lite manufactured by Yanako. The results are shown in Table 1 and FIG.

conditions:
Fuel: A heavy oil (calorific value 37.2 MJ/L) and ammonia Supply amount of A heavy oil: 0.97 L/h
Mixing ratio of A heavy oil and ammonia (heat of combustion: 18.6 MJ/kg_gas) (calorific value basis): A heavy oil: ammonia = 70:30
V02/V01: 1.2
V12/V11: 0.8

V01 in this experimental example is the theoretical amount (volume) of oxygen required to burn the ammonia and A heavy oil supplied to the first flow path and the second flow path. V02 is the total amount of oxygen contained in the air supplied from the first flow path, the second flow path, and the third flow path. V11 is the theoretical oxygen amount (volume) required to burn the ammonia supplied to the first flow path. V12 is the amount of oxygen contained in the air supplied to the first flow path.

(Experimental example 1-2)
A combustion experiment was conducted in the same manner as in Experimental Example 1-1, except that V12/V11:0.9, and the NOx concentration in the exhaust gas generated at that time was measured in the same manner as in Experimental Example 1-1. . The results are shown in Table 1 and FIG.

(Experimental example 1-3)
A combustion experiment was conducted in the same manner as in Experimental Example 1-1, except that V12/V11:1.0, and the NOx concentration in the exhaust gas generated at that time was measured in the same manner as in Experimental Example 1-1. . The results are shown in Table 1 and FIG.

(Experimental example 1-4)
A combustion experiment was conducted in the same manner as in Experimental Example 1-1, except that V12/V11:1.1, and the NOx concentration in the exhaust gas generated at that time was measured in the same manner as in Experimental Example 1-1. . The results are shown in Table 1 and FIG.

(Experimental example 1-5)
A combustion experiment was conducted in the same manner as in Experimental Example 1-1, except that V12/V11:1.2, and the NOx concentration in the exhaust gas generated at that time was measured in the same manner as in Experimental Example 1-1. . The results are shown in Table 1 and FIG.

(Experimental example 2-1)
A combustion experiment was conducted in the same manner as in Experimental Example 1-1 except that V02/V01: 1.09 and V12/V11: 0.9, and the NOx concentration in the exhaust gas generated at that time was measured as an experimental example. Measured in the same manner as in 1-1. The results are shown in Table 1 and FIG.

(Experimental example 2-2)
A combustion experiment was conducted in the same manner as in Experimental Example 2-1, except that V12/V11:1.0, and the NOx concentration in the exhaust gas generated at that time was measured in the same manner as in Experimental Example 1-1. . The results are shown in Table 1 and FIG.

(Experimental example 2-3)
A combustion experiment was conducted in the same manner as in Experimental Example 2-1, except that V12/V11:1.1, and the NOx concentration in the exhaust gas generated at that time was measured in the same manner as in Experimental Example 1-1. . The results are shown in Table 1 and FIG.

(Experimental example 2-4)
A combustion experiment was conducted in the same manner as in Experimental Example 2-1, except that V12/V11:1.2, and the NOx concentration in the exhaust gas generated at that time was measured in the same manner as in Experimental Example 1-1. . The results are shown in Table 1 and FIG.

(Experimental example 3-1)
A combustion experiment was conducted in the same manner as in Experimental Example 1-1 except that V02/V01: 1.05 and V12/V11: 0.9, and the NOx concentration in the exhaust gas generated at that time was measured as an experimental example. Measured in the same manner as in 1-1. The results are shown in Table 1 and FIG.

(Experimental example 3-2)
A combustion experiment was conducted in the same manner as in Experimental Example 3-1, except that V12/V11:1.0, and the NOx concentration in the exhaust gas generated at that time was measured in the same manner as in Experimental Example 1-1. . The results are shown in Table 1 and FIG.

(Experimental example 3-3)
A combustion experiment was conducted in the same manner as in Experimental Example 3-1, except that V12/V11:1.1, and the NOx concentration in the exhaust gas generated at that time was measured in the same manner as in Experimental Example 1-1. . The results are shown in Table 1 and FIG.

(Experimental example 4-1)
A pulverized coal combustion burner (outer diameter 50 mm) having a first flow path and a second flow path as shown in FIG. Combustion experiments were conducted in Methane gas and air are supplied from the first supply mechanism to the first passage of the pulverized coal combustion burner, and pulverized coal and air are supplied from the second supply mechanism to the second passage of the pulverized coal combustion burner for combustion. did At the same time, methane gas and air were supplied to a torch for supporting combustion provided near the pulverized coal combustion burner for combustion. Then, the NOx concentration in the exhaust gas generated at that time was measured in the same manner as in Experimental Example 1-1. In addition, the CO ₂ concentration was measured using an exhaust gas measuring instrument EIR-31S manufactured by Yanako. Table 2 shows the results. In the remarks column of Table 2, the types of examples and comparative examples are shown.

conditions:
Fuel: pulverized coal (calorific value 37.2 MJ/L), methane gas (calorific value 36 MJ/Nm ³ )
Supply amount of pulverized coal: 956g/h
Amount of methane gas supplied to support combustion torch: 0.12 Nm ³ /h
Mixing ratio of the sum of pulverized coal and methane gas supplied to the auxiliary combustion torch and the methane gas supplied to the first flow path (calorific value basis) (pulverized coal + methane gas): methane gas = 70:30

V01 in this experimental example is the theory necessary to burn the methane gas supplied to the first flow path, the pulverized coal supplied to the second flow path, and the methane gas supplied to the auxiliary combustion torch. It is the amount of oxygen (volume). V02 is the total amount of oxygen contained in the air supplied from the first flow path, the second flow path, and the supporting torch.

As shown in Table 2, in Experimental Example 4-1 corresponding to the comparative example, the amount of CO ₂ generated was large.

(Experimental example 5-1)
Except that an ammonia supply nozzle was provided separately from the pulverized coal combustion burner and the auxiliary combustion torch, the first flow path was configured with this ammonia supply nozzle, and methane gas was not supplied to the pulverized coal combustion burner. A combustion experiment was conducted in the same manner as in Experimental Example 4-1. That is, the pulverized coal combustion burner in this experimental example had only the second flow path.

Ammonia and air (the amount of oxygen contained therein is V12) are supplied from the first supply mechanism to the ammonia supply nozzle constituting the first flow path, and from the second supply mechanism to the second pulverized coal combustion burner. Combustion was performed by supplying pulverized coal and air to the flow path. At the same time, methane gas and air were supplied to a torch for auxiliary combustion provided in the vicinity of the pulverized coal combustion burner and the ammonia supply nozzle for combustion. Then, the NOx concentration and CO ₂ concentration in the exhaust gas generated at that time were measured in the same manner as in Experimental Example 4-1. Table 3 shows the results. In the remarks column of Table 3, the types of examples and comparative examples are shown.

conditions:
Fuel: pulverized coal (calorific value 37.2 MJ/L), methane gas (calorific value 36 MJ/Nm ³ ) and ammonia Pulverized coal supply: 956 g/h
Supply amount of methane gas: 0.12 Nm ³ /h
Mixing ratio (calorific value basis) of sum of pulverized coal and methane gas and ammonia (combustion heat: 18.6 MJ/kg_gas) (pulverized coal + methane gas): ammonia = 70:30
V02/V01: 1.2
V12/V11: 1.2

V01 in this experimental example is the theoretical oxygen required to burn the ammonia supplied to the first flow path, the pulverized coal supplied to the second flow path, and the methane gas supplied to the auxiliary combustion torch. quantity (volume). V02 is the total amount of oxygen contained in the air supplied from the first flow path, the second flow path, and the supporting torch. V11 is the theoretical oxygen amount (volume) required to burn the ammonia supplied to the first flow path. V12 is the amount of oxygen contained in the air supplied to the first flow path.

(Experimental example 5-2)
A combustion experiment was conducted in the same manner as in Experimental Example 5-1 except that V12 was adjusted so that V12/V11 was 1.1, and the NOx concentration and CO ₂ concentration in the exhaust gas generated at that time were tested. It was measured in the same manner as in Example 5-1. Table 3 shows the results.

(Experimental example 5-3)
A combustion experiment was conducted in the same manner as in Experimental Example 5-1 except that V12 was adjusted so that V12/V11 was 1.0, and the NOx concentration and CO ₂ concentration in the exhaust gas generated at that time were tested. It was measured in the same manner as in Example 5-1. Table 3 shows the results.

As shown in Table 3, in Experimental Examples 5-1 to 5-3, it was confirmed that the generation of NOx and CO ₂ in the exhaust gas could be suppressed.

Reference Signs List 1 heating device 10 combustion chamber 20, 20A combustion mechanism 21 first flow path 22 second flow path 23 third flow path 30 first supply mechanism 40 ... a second feeding mechanism.

Claims (7)

a combustion chamber in which raw materials are charged and fired ;
a first supply mechanism that supplies ammonia and oxygen to the combustion chamber;
a second supply mechanism that supplies oxygen and other fuel, which is a carbon-containing fuel other than ammonia, to the combustion chamber;
with
A heating device that generates heat by burning the ammonia and the other fuel in the combustion chamber,
V01: theoretical amount (volume) of oxygen required to burn the ammonia supplied from the first supply mechanism and the other fuel supplied from the second supply mechanism;
V02: total oxygen amount (volume) supplied to the combustion chamber;
V11: theoretical oxygen amount (volume) required to burn the ammonia supplied from the first supply mechanism;
V12: the amount (volume) of oxygen supplied from the first supply mechanism;
when
A kiln in which (V12/V11)/(V02/V01) is 0.8 or more. a burner having a tip positioned within the combustion chamber and having a second flow path connected to the second feed mechanism and a first flow path connected to the first feed mechanism; 2. The kiln of claim 1, comprising: The burner has a triple tube structure,
From the inside to the outside, a third flow path connected to a third supply mechanism for supplying oxygen to the combustion chamber, the second flow path, and the first flow path are arranged in this order. 3. The kiln of claim 2, comprising: The ammonia is supplied by the first supply mechanism out of the first and second supply mechanisms,
The kiln according to any one of claims 1 to 3 , wherein said other fuel is supplied by said second supply mechanism out of said first and second supply mechanisms. A kiln as claimed in any preceding claim, wherein the other fuel is gaseous or liquid. In a kiln having a combustion chamber into which raw materials are charged, ammonia and oxygen are supplied from a first supply mechanism to the combustion chamber, and a fuel other than ammonia is supplied from a second supply mechanism to the combustion chamber. is supplied with fuel and oxygen, and burned in the combustion chamber to generate heat and bake the raw material ,
V01: theoretical amount (volume) of oxygen required to burn the ammonia supplied from the first supply mechanism and the other fuel supplied from the second supply mechanism;
V02: total oxygen amount (volume) supplied to the combustion chamber;
V11: theoretical oxygen amount (volume) required to burn the ammonia supplied from the first supply mechanism;
V12: the amount (volume) of oxygen supplied from the first supply mechanism;
when
A heating method in which combustion is performed so that (V12/V11)/(V02/V01) is 0.8 or more. 6. The heating method according to claim 5, comprising the step of adjusting V12/V11 while keeping V02/V01 constant.

Images