Ammonia flow rate evaluation system, ammonia fuel utilization device, and ammonia flow rate evaluation method

Abstract

An ammonia flow rate evaluation system (1) comprises: a first measurement unit (10) to which a substance-to-be-measured containing gaseous ammonia is supplied; a second measurement unit (30) located downstream of the first measurement unit in the flow direction of the substance-to-be-measured; and an ammonia absorption unit (20) which has an ammonia absorbent that absorbs ammonia included in the substance-to-be-measured, and which is installed between the first measurement unit and the second measurement unit and connected to the first measurement unit and the second measurement unit. The first measurement unit (10) measures the ammonia pre-absorption flow rate (XA), the ammonia absorption unit (20) removes ammonia from the substance-to-be-measured that has passed through the first measurement unit (10) by absorbing it with an ammonia absorbent, and the second measurement unit (30) measures the ammonia post-absorption flow rate (XB).

Description

Ammonia flow rate evaluation system, ammonia fuel utilization device, and ammonia flow rate evaluation method

[0001] The present disclosure relates to an ammonia flow rate evaluation system, an ammonia fuel utilization device, and an ammonia flow rate evaluation method.

[0002] In recent years, methods for using ammonia, a renewable energy source, as fuel have been studied. In combustion equipment that burns ammonia, ammonia is stored in a reservoir or container and supplied through a fuel supply line (piping). In this case, it is necessary to replace the remaining gas in the fuel supply line with ammonia when filling the fuel. Therefore, it is necessary to evaluate the ammonia flow rate in the fuel supply line and confirm that the replacement with ammonia has been completed.

[0003] Conventionally, in order to check the status of substitution with ammonia in a fuel supply line, it is known to use a general ammonia concentration measuring device such as gas chromatography, infrared spectroscopy, or a gas detector tube. As a method for checking the ammonia concentration in a fuel system, Patent Document 1 discloses an ammonia-fueled boiler system that can suppress emissions of nitrogen oxides (NOx), and is equipped with an ammonia measuring instrument for measuring the residual ammonia concentration in the burner installation area.

[0004] JP 2023-95048 A

[0005] However, gas chromatography or infrared spectroscopy requires utilities, which makes it difficult to install a measuring device and time-consuming to evaluate the ammonia flow rate. Furthermore, while gas detector tubes allow for simplified analysis, they are difficult to handle the high concentrations of ammonia expected in the fuel supply line of an ammonia combustion device. Furthermore, the ammonia measuring device used in Patent Document 1 is intended for low-concentration ammonia, such as ammonia supplied at a concentration similar to that of nitrogen oxides (1% or less), which is used to denitrify nitrogen oxides generated in exhaust gas during combustion. Thus, conventional methods have had the drawbacks of being difficult to install a measuring device for checking the ammonia replacement status, requiring a lot of time to evaluate the ammonia flow rate, and making it difficult to handle the high concentrations of ammonia expected in the fuel supply line of an ammonia combustion device.

[0006] Therefore, an object of the present disclosure is to provide an ammonia flow rate evaluation system, an ammonia fuel utilization device, and an ammonia flow rate evaluation method that are capable of handling high concentrations of ammonia, and that allow for simple installation of a measuring device and simple evaluation method for checking the replacement status with ammonia.

[0007] The ammonia flow rate evaluation system according to the present disclosure comprises a first measurement unit to which a measurement target substance containing gaseous ammonia is supplied, a second measurement unit located downstream of the first measurement unit in the flow direction of the measurement target substance, and an ammonia absorption unit having an ammonia absorbent that absorbs ammonia in the measurement target substance, installed between the first measurement unit and the second measurement unit, and connected to the first measurement unit and the second measurement unit, wherein the first measurement unit measures a pre-ammonia absorption flow rate, which is the flow rate of ammonia in the measurement target substance before it is absorbed by the ammonia absorption unit, and the ammonia absorption unit removes ammonia from the measurement target substance that has passed through the first measurement unit by using the ammonia absorbent to absorb it, and the second measurement unit measures a post-ammonia absorption flow rate, which is the flow rate of the measurement target substance from which the ammonia has been removed.

[0008] The ammonia flow rate evaluation system may further include a suction pump that is located downstream of the second measurement unit in the direction of flow of the measurement target substance and that sucks the measurement target substance inside the second measurement unit.

[0009] The ammonia flow rate evaluation system may include a calculation unit that calculates a flow rate difference of the substance to be measured based on the flow rate before ammonia absorption and the flow rate after ammonia absorption, and calculates an ammonia absorption ratio of the substance to be measured based on the flow rate before ammonia absorption and the flow rate difference.

[0010] The ammonia absorbent may contain an acidic substance.

[0011] The ammonia fuel utilization device according to the present disclosure may include an ammonia flow rate evaluation system.

[0012] The ammonia flow rate evaluation method according to the present disclosure includes the steps of supplying a measurement target substance containing gaseous ammonia to a first measurement unit and measuring the flow rate of the measurement target substance before ammonia absorption in the first measurement unit; removing ammonia from the measurement target substance that has passed through the first measurement unit in an ammonia absorption unit having an ammonia absorbent by absorbing the ammonia with the ammonia absorbent; and supplying the measurement target substance from which ammonia has been removed to a second measurement unit and measuring the flow rate of the measurement target substance after ammonia absorption in the second measurement unit.

[0013] The flow rate difference of the measurement target substance may be calculated based on the flow rate before ammonia absorption and the flow rate after ammonia absorption, and the ammonia absorption amount ratio of the measurement target substance may be calculated based on the flow rate before ammonia absorption and the flow rate difference.

[0014] According to the present disclosure, it is possible to provide an ammonia flow rate evaluation system, an ammonia fuel utilization device, and an ammonia flow rate evaluation method that are capable of handling high concentrations of ammonia, and that allow for simple installation of a measuring device and a simple evaluation method for checking the replacement status with ammonia.

[0015] Fig. 1 is a schematic diagram showing an ammonia flow rate evaluation system according to a first embodiment. Fig. 2 is a schematic diagram showing an ammonia flow rate evaluation system according to a second embodiment.

[0016] Hereinafter, several exemplary embodiments will be described with reference to the drawings. Note that the dimensional proportions of the drawings are exaggerated for the convenience of explanation and may differ from the actual proportions.

[0017] [First Embodiment] An ammonia flow rate evaluation system 1 will be described using Figure 1. The ammonia flow rate evaluation system 1 according to this embodiment includes a first measurement unit 10 to which a measurement target substance containing gaseous ammonia is supplied. The ammonia flow rate evaluation system 1 also includes a second measurement unit 30 located downstream of the first measurement unit 10 in the flow direction of the measurement target substance. The ammonia flow rate evaluation system 1 further includes an ammonia absorption unit 20 that has an ammonia absorbent that absorbs ammonia in the measurement target substance, is installed between the first measurement unit 10 and the second measurement unit 30, and is connected to the first measurement unit 10 and the second measurement unit 30.

[0018] The first measuring unit 10 measures the flow rate of ammonia before absorption X, which is the flow rate of ammonia in the measurement target substance before it is absorbed by the ammonia absorbing unit 20. Ａ The first measuring unit 10 is not particularly limited as long as it is a device that can measure the gas flow rate, but from the viewpoint of ease of installation, it is preferable to use a general-purpose dry gas meter as the first measuring unit 10.

[0019] The ammonia absorbing unit 20 uses an ammonia absorbent to absorb and remove ammonia from the measurement target substance that has passed through the first measuring unit 10. From the viewpoint of easy installation, the ammonia absorbing unit 20 may include an outlet pipe for introducing the measurement target substance into the ammonia absorbent, and a storage tank or container that stores the ammonia absorbent.

[0020] The ammonia absorbent is not particularly limited as long as it is a substance that can absorb and remove ammonia from the substance to be measured, but it may also contain an acidic substance. The acidic substance may be, for example, an acidic substance containing at least one selected from the group consisting of nitric acid, sulfuric acid, phosphoric acid, and hydrochloric acid. The ammonia absorbent may also be water. Furthermore, it is also effective to use a solid absorbent as a dry absorbent for the ammonia absorbent. The solid absorbent may be, for example, a porous material with a large specific surface area, such as activated carbon, activated alumina, or zeolite, or an absorbent in which the above-mentioned acidic substance is impregnated using these materials as a carrier.

[0021] The second measuring section 30 measures the flow rate of the measurement target substance after ammonia absorption X, which is the flow rate of the measurement target substance after ammonia removal in the ammonia absorbing section 20. Ｂ As with the first measurement unit 10, it is preferable that a general-purpose dry gas meter be used for the second measurement unit 30.

[0022] The ammonia supply unit 50 supplies the measurement target substance containing gaseous ammonia to the first measurement unit 10. The ammonia supply unit 50 is not particularly limited as long as it can supply the measurement target substance containing gaseous ammonia. For example, it may be a storage tank or container that stores the measurement target substance containing gaseous ammonia, or a pipe through which the measurement target substance containing gaseous ammonia flows. The ammonia supply unit 50 may also be connected to a fuel supply line in a combustion device that combusts ammonia. When supplying ammonia through the fuel supply line, it is necessary to replace the remaining gas in the fuel supply line with ammonia so that oxygen does not remain in the fuel supply line. Therefore, by connecting the ammonia supply unit 50 to the fuel supply line, the replacement status with ammonia can be confirmed using the ammonia flow rate evaluation system 1. As described above, the ammonia flow rate evaluation system 1 includes the first measurement unit 10, the ammonia absorption unit 20, and the second measurement unit 30, and therefore, it is easy to install a measurement device for confirming the replacement status with ammonia.

[0023] When the pressure in the ammonia supply unit 50 is positive, or when the substance to be measured is supplied to the first measurement unit 10 under its own pressure, a valve in the pipe connecting the ammonia supply unit 50 and the first measurement unit 10 is opened, and the ammonia supply unit 50 supplies the substance to be measured to the first measurement unit 10. When the pressure in the ammonia supply unit 50 is negative, or when the substance to be measured is not supplied to the first measurement unit 10 under its own pressure, it is preferable to provide a suction pump 40 downstream of the second measurement unit 30 in the flow direction of the substance to be measured, as described below.

[0024] As shown in FIG. 1 , the ammonia flow rate evaluation system 1 may include a pipe connected to a gas supply unit 60 between the ammonia supply unit 50 and the first measurement unit 10. From the viewpoint of the safety of the ammonia flow rate evaluation system 1 and the person measuring, it is preferable that the gas supply unit 60 be capable of supplying an oxygen-free gas, and it is more preferable that it be capable of supplying nitrogen. That is, it is more preferable that the gas supply unit 60 be a nitrogen supply source. The nitrogen supply source may be a pipe through which nitrogen flows, or may be a storage tank or container that stores nitrogen. By using the gas supply unit 60 as a nitrogen supply source, it is possible to perform nitrogen substitution in the first measurement unit 10, the ammonia absorption unit 20, and the second measurement unit 30 before measurement, or to simultaneously flow the measurement target substance and nitrogen during measurement.

[0025] The first measuring unit 10 measures the flow rate of ammonia before absorption X, which is the flow rate of ammonia in the measurement target substance before it is absorbed in the ammonia absorbing unit. Ａ The ammonia absorption unit 20 then uses an ammonia absorbent to absorb and remove ammonia from the measurement target substance that has passed through the first measurement unit 10. Furthermore, the second measurement unit 30 measures the post-absorption ammonia flow rate X, which is the flow rate of the measurement target substance from which ammonia has been removed. Ｂ Measure.

[0026] Ammonia pre-absorption flow rate X Ａ and ammonia post-absorption flow rate X Ｂ Specifically, the flow rate difference X is expressed by the following formula (1). That is, the flow rate difference X is calculated by multiplying the flow rate X before ammonia absorption by Ａ and ammonia post-absorption flow rate X Ｂ The difference between the absorbed amount of ammonia and the absorbed amount of ammonia absorbed by the ammonia absorbent is calculated as X = X Ａ -X Ｂ (1)

[0027] On the other hand, the flow rate before ammonia absorption X Ａ The ammonia absorption ratio Y (%) of the measurement target substance may be calculated based on the flow rate X before ammonia absorption. Specifically, the ammonia absorption ratio Y is expressed by the following formula (2).Ａ The larger the value of the ammonia absorption amount ratio Y, the smaller the flow rate difference X before ammonia absorption. Ａ indicates that the ammonia content in the gas being measured is high, and indicates that the ammonia flow rate in the measurement target substance is high. From the viewpoint of confirming that the replacement with ammonia is complete, the ammonia absorption ratio Y may be 80% or more, 85% or more, 90% or more, or 95% or more. In this way, the ammonia flow rate evaluation system 1 allows for simple installation of a measuring device and simple evaluation method for confirming the replacement status with ammonia, and is capable of handling high concentrations of ammonia expected in the fuel supply line of an ammonia combustion device. Y (%) = (X Ａ -X Ｂ ) / X Ａ x 100 = X / X Ａ ×100 (2)

[0028] As described above, the ammonia absorbing unit 20 removes ammonia by absorbing it with an ammonia absorbent from the measurement target substance that has passed through the first measuring unit 10. The ammonia removal rate Z (%) in the ammonia absorbing unit 20 is calculated by multiplying the ammonia pre-absorption flow rate X Ａ The ammonia flow rate Z contained in the gas to be measured Ａ and ammonia post-absorption flow rate X Ｂ The ammonia flow rate Z contained in the gas to be measured Ｂ Specifically, the ammonia removal rate Z is expressed by the following formula (3). From the viewpoint of measurement accuracy, the ammonia removal rate Z may be 80% or more, 85% or more, 90% or more, or 95% or more. The ammonia removal rate Z can be adjusted by the amount of ammonia absorbent in the ammonia absorption section 20 or the flow rate of the substance to be measured. Z (%) = (Z Ａ -Z Ｂ ) / Z Ａ ×100 (3)

[0029] When all ammonia is removed from the measurement target substance that has passed through the first measurement unit 10 in the ammonia absorption unit 20, Z Ｂ Since the value of is 0, the ammonia removal rate Z is 100%. Ｂ The gas to be measured does not contain ammonia, but contains gases other than ammonia. In other words, the flow rate difference X is the amount of ammonia absorbed by the ammonia absorbent, and corresponds to the flow rate of ammonia contained in the substance to be measured. Furthermore, the ammonia absorption rate ratio Y indicates the ammonia concentration of the substance to be measured.

[0030] The ammonia flow rate evaluation system 1 may include a calculation unit 70 as shown in FIG. 1. The calculation unit 70 calculates the ammonia pre-absorption flow rate X measured by the first measurement unit 10. Ａ and the post-absorption ammonia flow rate X measured by the second measuring unit 30 Ｂ The calculation unit 70 may calculate the flow rate difference X of the measurement target substance based on the above formula (1). Ａ and ammonia post-absorption flow rate X Ｂ On the other hand, the calculation unit 70 may calculate the flow rate difference X by the difference between the ammonia pre-absorption flow rate X Ａ The ammonia absorption ratio Y of the measurement target substance may be calculated based on the difference in flow rate X and the ammonia absorption ratio Y of the measurement target substance. Ａ The ammonia absorption ratio Y (%) of the measurement target substance may be calculated based on the ratio of the ammonia flow rate Z Ａ and ammonia flow rate Z Ｂ The ammonia removal rate Z in the ammonia absorbing section 20 may be calculated based on the above.

[0031] The ammonia flow rate evaluation system 1 may include an output unit (not shown). The output unit may output information on the flow rate difference X of the measurement target substance, the ammonia absorption ratio Y, and the ammonia removal rate Z calculated by the calculation unit 70. The output unit may also be a display device such as a liquid crystal display, a printing device such as a printer, an information communication device, or the like.

[0032] As described above, the ammonia flow rate evaluation system 1 can provide an ammonia flow rate evaluation system that allows for simple installation of a measuring device for checking the replacement status with ammonia and a simple evaluation method, and is capable of handling high concentrations of ammonia.

[0033] Second Embodiment Next, an ammonia flow rate evaluation system 1 according to a second embodiment will be described with reference to Figure 2. The ammonia flow rate evaluation system 1 may further include a suction pump 40 in addition to the ammonia flow rate evaluation system 1 according to the first embodiment. Specifically, the suction pump 40 is located downstream of the second measurement unit 30 in the flow direction of the measurement target substance, and sucks the measurement target substance inside the second measurement unit 30. As the other parts are the same as those of the ammonia flow rate evaluation system 1 according to the first embodiment, a description thereof will be omitted.

[0034] When the pressure in the ammonia supply unit 50 is negative, or when the substance to be measured is not supplied to the first measurement unit 10 by its own pressure, the ammonia flow rate evaluation system 1 according to the second embodiment can forcibly supply the substance to be measured from the ammonia supply unit 50 to the first measurement unit 10.

[0035] An example of an evaluation method using the ammonia flow rate evaluation system 1 according to the second embodiment will be described. First, nitrogen was supplied from the gas supply unit 60, which is a nitrogen supply source, and nitrogen substitution was performed in the first measurement unit 10, the ammonia absorption unit 20, and the second measurement unit 30. Next, the ammonia supply unit 50 was connected to the fuel supply line of the ammonia combustion device, and the valve of the piping connecting the ammonia supply unit 50 and the first measurement unit 10 was opened. Thereafter, the suction pump 40 was started, and sufficient substitution was performed in the first measurement unit 10, the ammonia absorption unit 20, and the second measurement unit 30 with the measurement target substance and nitrogen. Then, the flow rates were measured for 5 minutes using dry gas meters in the first measurement unit 10 and the second measurement unit 30, and the result was that the pre-absorption flow rate X Ａ is 10 L / min, and the flow rate after ammonia absorption X Ｂ The ammonia absorption rate Y was calculated to be 90% using the above formula (2).

[0036] On the other hand, the flow rate before ammonia absorption X Ａ The ammonia flow rate Z contained in the gas to be measured Ａ The flow rate of the ammonia after absorption was 9 L / min, and the nitrogen flow rate was 1 L / min. Ｂ The ammonia flow rate Z contained in the gas to be measured Ｂ The nitrogen flow rate was 1 L / min, and the ammonia removal rate Z in the ammonia absorbing section 20 was calculated to be 100% from the above formula (3). Furthermore, the weight of the ammonia absorbent in the ammonia absorbing section 20 increased by 34 g as a result of the 5-minute flow rate measurement. This increase in the weight of the ammonia absorbent was calculated based on the ammonia flow rate Z Ａ This corresponds to 45 L of ammonia flowing for 5 minutes at a flow rate of 9 L / min. Only ammonia is absorbed by the ammonia absorbent, and the ammonia pre-absorption flow rate X Ａ and ammonia post-absorption flow rate X Ｂ No change in nitrogen flux was observed.

[0037] As explained above, the ammonia flow rate evaluation system 1 according to this embodiment includes a first measurement unit 10 to which a measurement target substance containing gaseous ammonia is supplied. The ammonia flow rate evaluation system 1 also includes a second measurement unit 30 located downstream of the first measurement unit 10 in the flow direction of the measurement target substance. The ammonia flow rate evaluation system 1 further includes an ammonia absorption unit 20 having an ammonia absorbent that absorbs ammonia in the measurement target substance, and installed between the first measurement unit 10 and the second measurement unit 30, and connected to the first measurement unit 10 and the second measurement unit 30. The first measurement unit 10 then calculates a pre-ammonia absorption flow rate X , which is the flow rate of ammonia in the measurement target substance before it is absorbed by the ammonia absorption unit 20. Ａ The ammonia absorption unit 20 uses an ammonia absorbent to absorb and remove ammonia from the measurement target substance that has passed through the first measurement unit 10. Furthermore, the second measurement unit 30 measures the post-absorption ammonia flow rate X, which is the flow rate of the measurement target substance from which ammonia has been removed. Ｂ Measure the flow rate before ammonia absorption X Ａ and ammonia post-absorption flow rate X ＢTherefore, the ammonia flow rate evaluation system 1 can provide an ammonia flow rate evaluation system that allows for a simple installation of a measuring device for checking the replacement status with ammonia and a simple evaluation method, and that can handle high concentrations of ammonia.

[0038] The ammonia fuel utilization device of this embodiment may include an ammonia flow rate evaluation system 1. Examples of the ammonia fuel utilization device include an ammonia combustion device and an ammonia fuel cell.

[0039] The ammonia combustion apparatus may be a combustion apparatus such as a boiler that combusts gaseous ammonia, or may be a combustion apparatus that vaporizes liquid ammonia to generate gaseous ammonia and then combusts the gaseous ammonia. The ammonia combustion apparatus may also be a combustion apparatus that mixes and burns gaseous ammonia with a fuel other than ammonia, such as pulverized coal or biomass fuel. As described above, by connecting the ammonia supply unit 50 to the fuel supply line of the ammonia combustion apparatus and providing the ammonia flow rate evaluation system 1 to the ammonia combustion apparatus, it is possible to check the status of replacement with ammonia in the fuel supply line.

[0040] The ammonia fuel cell may be a fuel cell that reacts hydrogen obtained by decomposing ammonia, or may be a fuel cell that directly reacts ammonia. By connecting the ammonia supply unit 50 to the fuel supply line of the ammonia fuel cell and providing the ammonia flow rate evaluation system 1 in the ammonia fuel cell, it is possible to check the replacement status with ammonia in the fuel supply line.

[0041] As described above, the ammonia fuel utilization apparatus of the present embodiment can provide an ammonia fuel utilization apparatus that can handle high concentrations of ammonia, in which the installation of a measuring device for checking the replacement status with ammonia and the evaluation method are simple.

[0042] Next, the ammonia flow rate evaluation method according to this embodiment will be described. In the ammonia flow rate evaluation method, a measurement target substance containing gaseous ammonia is supplied to the first measurement unit 10, and the first measurement unit 10 measures the flow rate X Ａ The ammonia flow rate evaluation method also includes a step of removing ammonia from the measurement target substance that has passed through the first measurement unit 10 by absorbing it with the ammonia absorbent in an ammonia absorption unit 20 having an ammonia absorbent. Furthermore, the ammonia flow rate evaluation method includes a step of supplying the measurement target substance from which ammonia has been removed to a second measurement unit 30, and measuring the post-ammonia absorption flow rate X of the measurement target substance in the second measurement unit 30. Ｂ The method includes measuring the following:

[0043] As described above, the flow rate difference X of the substance to be measured is the flow rate X before ammonia absorption. Ａ and ammonia post-absorption flow rate X Ｂ The ammonia absorption ratio Y of the measurement target substance may be calculated based on the ammonia pre-absorption flow rate X Ａ and the flow rate difference X. Therefore, the ammonia flow rate evaluation method according to this embodiment can provide an ammonia flow rate evaluation method that is easy to install a measuring device for checking the replacement status with ammonia and is easy to evaluate, and that can handle high concentrations of ammonia.

[0044] Although several embodiments have been described, the embodiments can be modified or varied based on the above disclosure. All components of the above embodiments and all features described in the claims may be individually extracted and combined, unless they contradict each other.

[0045] This disclosure can contribute, for example, to Goal 7 of the United Nations-led Sustainable Development Goals (SDGs), "Ensure access to affordable, reliable, sustainable and modern energy for all" and Goal 13, "Take urgent action to combat climate change and its impacts."

[0046] The entire contents of Japanese Patent Application No. 2024-030018 (filing date: February 29, 2024) are incorporated herein by reference.

[0047] REFERENCE SIGNS LIST 1 ammonia flow rate evaluation system 10 first measurement unit 20 ammonia absorption unit 30 second measurement unit 40 suction pump 70 calculation unit X flow rate difference X Ａ Ammonia pre-absorption flow rate X Ｂ Ammonia absorption rate after ammonia absorption Y Ammonia absorption rate

Claims

1. An ammonia flow rate evaluation system comprising: a first measurement unit to which a measurement target substance containing gaseous ammonia is supplied; a second measurement unit located downstream of the first measurement unit in the flow direction of the measurement target substance; and an ammonia absorption unit having an ammonia absorbent that absorbs ammonia in the measurement target substance, installed between the first measurement unit and the second measurement unit, and connected to the first measurement unit and the second measurement unit, wherein the first measurement unit measures a pre-ammonia absorption flow rate, which is the flow rate of ammonia in the measurement target substance before it is absorbed by the ammonia absorption unit, the ammonia absorption unit removes ammonia from the measurement target substance that has passed through the first measurement unit, by using the ammonia absorbent, and the second measurement unit measures a post-ammonia absorption flow rate, which is the flow rate of the measurement target substance from which the ammonia has been removed.

2. The ammonia flow rate evaluation system according to claim 1, further comprising a suction pump located downstream of the second measurement section in the flow direction of the substance to be measured, for suctioning the substance to be measured within the second measurement section.

3. The ammonia flow rate evaluation system according to claim 1 or 2, further comprising a calculation unit that calculates a flow rate difference of the substance to be measured based on the flow rate before ammonia absorption and the flow rate after ammonia absorption, and calculates an ammonia absorption ratio of the substance to be measured based on the flow rate before ammonia absorption and the flow rate difference.

4. The ammonia flow rate evaluation system according to any one of claims 1 to 3, wherein the ammonia absorbent contains an acidic substance.

5. An ammonia fuel utilization device comprising the ammonia flow rate evaluation system according to any one of claims 1 to 4.

6. A method for evaluating ammonia flow rate, comprising the steps of: supplying a measurement target substance containing gaseous ammonia to a first measurement unit, and measuring the flow rate of the measurement target substance before ammonia absorption in the first measurement unit; removing ammonia from the measurement target substance that has passed through the first measurement unit in an ammonia absorption unit having an ammonia absorbent by absorbing the ammonia with the ammonia absorbent; and supplying the measurement target substance from which the ammonia has been removed to a second measurement unit, and measuring the flow rate of the measurement target substance after ammonia absorption in the second measurement unit.

7. The ammonia flow rate evaluation method according to claim 6, wherein the flow rate difference of the substance to be measured is calculated based on the flow rate before ammonia absorption and the flow rate after ammonia absorption, and the ammonia absorption amount ratio of the substance to be measured is calculated based on the flow rate before ammonia absorption and the flow rate difference.

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