Exhaust gas analysis device and exhaust gas analysis method

Abstract

The present invention analyzes performance of predetermined reaction processing on exhaust gas performed by a reaction part for replacing a reaction device installed in an exhaust gas duct, under an environmental condition equivalent to that of the reaction device without removing the reaction device. Provided is an exhaust gas analysis device (100) comprising: a collection pipe (10) that is detachably attached to an exhaust heat recovery boiler including an exhaust gas duct (224) and a denitration catalyst (223b) for performing reduction processing on combustion exhaust gas (Ge) flowing through the exhaust gas duct (224), that collects the combustion exhaust gas (Ge) on the upstream side of the denitration catalyst (223b) in the exhaust gas duct (224), and that guides the combustion exhaust gas (Ge) to the outside of the exhaust gas duct (224); a reactor (20) that is attached to the collection pipe (10) and performs reduction processing on the combustion exhaust gas (Ge) flowing through the collection pipe (10); and a NOx measurement device (30) that analyzes components of the combustion exhaust gas (Ge) subjected to the reduction processing by the reactor (20).

Description

Exhaust gas analyzer and exhaust gas analysis method

[0001] The present disclosure relates to an exhaust gas analysis device and an exhaust gas analysis method.

[0002] Conventionally, in gas turbine combined cycle power generation facilities that generate electricity by driving a generator with a gas turbine, a denitration device is provided in the heat recovery boiler to reduce and remove NOx contained in the combustion exhaust gas discharged from the gas turbine, etc. (See, for example, Patent Document 1.) The denitration device injects a reducing agent such as ammonia into the combustion exhaust gas, causes the NOx and the reducing agent to react in a catalyst, and reduces and removes the NOx into harmless nitrogen and water (so-called denitration).

[0003] JP 2018-138771 A

[0004] With the recent spread of renewable energy, gas turbine combined cycle power plants are sometimes operated at a low load (lower than the rated load) to suppress power output during periods when renewable energy output is high. In such low-load operation, the ratio of nitrogen dioxide in the nitrogen oxides contained in the combustion exhaust gas emitted from the gas turbine increases compared to high-load operation, resulting in a decrease in the nitrogen dioxide removal efficiency by the catalyst.

[0005] In order to increase the nitrogen oxide removal rate during low-load operation, it is effective to replace the catalyst in the denitration system with a new catalyst that has a high rate of removing nitrogen dioxide, which is one of the nitrogen oxides.In order to accurately compare the nitrogen oxide removal rate of the existing catalyst installed in the denitration system with that of the new catalyst, it is necessary to test the existing catalyst and the new catalyst in an equivalent environment.

[0006] However, removing an existing catalyst installed in an operating exhaust heat recovery system and installing a new catalyst in its place requires shutting down the system and performing a labor-intensive task. Therefore, even if the new catalyst is expected to have a high removal rate of a specific gas component, it is not easy to install the new catalyst in the same environment as the existing catalyst and test it to confirm its performance.

[0007] The present disclosure has been made in consideration of the above circumstances, and aims to provide an exhaust gas analysis device and an exhaust gas analysis method that are capable of analyzing the performance of a predetermined reaction process on exhaust gas by a reaction section that replaces a reaction device installed in an exhaust gas duct, under environmental conditions equivalent to those of the reaction device, without removing the reaction device.

[0008] In order to solve the above problems, the exhaust gas analyzer and exhaust gas analysis method of the present disclosure employ the following means: The exhaust gas analyzer according to one aspect of the present disclosure is an exhaust gas analyzer that is detachably attached to an exhaust gas treatment device that includes an exhaust gas duct through which exhaust gas emitted from a combustion device flows and a reaction device that performs a predetermined reaction treatment on the exhaust gas flowing through the exhaust gas duct, and includes: a piping that samples the exhaust gas from the exhaust gas duct upstream of the reaction device and leads the exhaust gas to the outside of the exhaust gas duct; a reaction unit that is attached to the piping and performs the predetermined reaction treatment on the exhaust gas flowing through the piping; and an analysis unit that analyzes the components of the exhaust gas that has been subjected to the predetermined reaction treatment by the reaction unit.

[0009] An exhaust gas analysis method according to one aspect of the present disclosure is an exhaust gas analysis method for analyzing exhaust gas treated in an exhaust gas treatment device that includes an exhaust gas duct through which exhaust gas discharged from a combustion device flows and a reaction device provided in the exhaust gas duct that performs a predetermined reaction treatment on the exhaust gas, and includes a sampling step of sampling the exhaust gas upstream of the reaction device from the exhaust gas duct and sampling it into a pipe that leads it to the outside of the exhaust gas duct, a reaction step of performing the predetermined reaction treatment on the exhaust gas that has been led to the pipe in the sampling step, and an analysis step of analyzing the components of the exhaust gas that has undergone the predetermined reaction treatment in the reaction step.

[0010] According to the present disclosure, it is possible to provide an exhaust gas analyzer and an exhaust gas analysis method that can analyze the performance of a predetermined reaction process on exhaust gas by a reaction section that replaces a reactor installed in an exhaust gas duct, under environmental conditions equivalent to those of the reactor, without removing the reactor.

[0011] FIG. 1 is a schematic configuration diagram showing a gas turbine combined cycle power generation facility according to a first embodiment of the present disclosure. FIG. 2 is a partially enlarged view of the exhaust heat recovery steam generator shown in FIG. 1 , showing a state in which an exhaust gas analyzer is fixed to a mounting seat. FIG. 3 is a partially enlarged view of the exhaust heat recovery steam generator, showing a state in which a pressure sensor is fixed to a mounting seat. FIG. 4 is a flowchart showing an exhaust gas analysis method according to a first embodiment of the present disclosure. FIG. 5 is a partially enlarged view of the exhaust heat recovery steam generator according to a second embodiment of the present disclosure, showing a state in which an exhaust gas analyzer is fixed to a mounting seat. FIG. 6 is a partially enlarged view of the exhaust heat recovery steam generator, showing a state in which an exhaust gas analyzer is fixed to a mounting seat. FIG. 7 is a flowchart showing an exhaust gas analysis method according to a third embodiment of the present disclosure. FIG. 8 is a diagram showing a first modified example of the exhaust gas analyzer. FIG. 9 is a diagram showing a second modified example of the exhaust gas analyzer.

[0012] First Embodiment An exhaust gas analyzer 100 and an exhaust gas analysis method according to a first embodiment of the present disclosure will be described below with reference to the drawings. The exhaust gas analyzer 100 of this embodiment is a device that is detachably provided in a heat recovery steam generator (exhaust gas treatment device) 220 of a gas turbine combined power generation facility 200. As shown in Fig. 1 , the gas turbine combined power generation facility 200 includes a gas turbine (combustion device) 210, the heat recovery steam generator 220, and a reducing agent supply unit 230.

[0013] The gas turbine 210 includes a compressor 211, a combustor 212, a turbine 213, and a generator 214. The compressor 211, the turbine 213, and the generator 214 are coaxially coupled to each other so as to rotate integrally. The compressor 211 compresses air taken in from the outside and supplies the compressed air to the combustor 212.

[0014] The combustor 212 mixes the compressed air supplied from the compressor 211 with fuel and burns the mixture to generate high-temperature, high-pressure combustion gas. The turbine 213 rotates by adiabatic expansion of the high-temperature, high-pressure combustion gas supplied from the combustor 212. The generator 214 is provided coaxially with the turbine 213, and generates electricity by driving the turbine 213 to rotate. The combustion exhaust gas discharged from the turbine 213 contains nitrogen monoxide (NO), nitrogen dioxide (NO ２ The exhaust gas contains nitrogen oxides (hereinafter referred to as NOx), such as nitrogen oxides (NOx), which are generally collectively referred to as NOx.

[0015] The heat recovery boiler 220 has an upper heat exchanger 221, a lower heat exchanger 222, a denitration device 223, and an exhaust gas duct 224. The combustion exhaust gas Ge discharged from the turbine 213 is guided to the heat recovery boiler 220, where exhaust heat is recovered. The combustion exhaust gas Ge exchanges heat with water or steam as it passes through the upper heat exchanger 221 and the lower heat exchanger 222, thereby lowering its temperature. The combustion exhaust gas that has passed through the upper heat exchanger 221 is discharged into the atmosphere from above the heat recovery boiler 220.

[0016] The upper heat exchanger 221 has a plurality of heat transfer tubes 221 a. The upper heat exchanger 221 heats water or steam flowing inside the plurality of heat transfer tubes 221 a by heat exchange with the combustion exhaust gas Ge. The lower heat exchanger 222 has a plurality of heat transfer tubes 222 a. The lower heat exchanger 222 heats water or steam flowing inside the plurality of heat transfer tubes 222 a by heat exchange with the combustion exhaust gas Ge.

[0017] The denitration device 223 is a device that removes NOx contained in the combustion exhaust gas Ge from the turbine 213 that is guided to the heat recovery boiler 220. The denitration device 223 has a reducing agent injection nozzle 223a and a denitration catalyst (reaction device) 223b. The reducing agent injection nozzle 223a is a device that injects the reducing agent supplied from the reducing agent supply unit 230 toward the combustion exhaust gas Ge flowing through the exhaust gas duct 224 to mix the combustion exhaust gas Ge with the reducing agent. The amount of reducing agent injected from the reducing agent injection nozzle 223a is adjusted by a flow rate adjustment valve 232. A mixer (not shown) for promoting mixing of the combustion exhaust gas Ge with the reducing agent may be installed downstream of the reducing agent injection nozzle 223a.

[0018] Here, the reducing agent injected from the reducing agent injection nozzle 223 a is, for example, ammonia or urea water. When urea water is used as the reducing agent, the urea water injected toward the combustion exhaust gas Ge at a high temperature (for example, a temperature in the range of 300° C. or higher and 400° C. or lower) is hydrolyzed to generate ammonia, and the combustion exhaust gas Ge mixed with the ammonia is guided to the denitration catalyst 223 b.

[0019] The denitration catalyst 223b is a device that promotes a reduction reaction (predetermined reaction process) of NOx contained in the combustion exhaust gas Ge flowing through the exhaust gas duct 224. The denitration catalyst 223b has, for example, a honeycomb shape, promotes a reduction reaction of the combustion exhaust gas Ge passing through its interior, and causes the combustion exhaust gas Ge to pass downstream.

[0020] The denitration catalyst 223b converts ammonia (NH ３ ) to promote the reduction reaction of NOx. 4NO + 4NH ３ +O ２ →4N ２ +6H ２ O (1) NO+NO ２ +2NH ３ →2N2+3H ２ O (2) 6NO ２ +8NH ３ →7N ２ +12H ２ O (3)

[0021] The exhaust gas duct 224 is a duct through which the combustion exhaust gas Ge discharged from the gas turbine 210 flows. The exhaust gas duct 224 shown in Fig. 1 flows the combustion exhaust gas Ge from below to above along the height direction HD. The exhaust gas duct 224 mixes the combustion exhaust gas Ge with a reducing agent injected from a reducing agent injection nozzle 223a, causes heat exchange between the combustion exhaust gas Ge and water or steam in the lower heat exchanger 222, passes the combustion exhaust gas Ge through a denitration catalyst 223b to promote a reduction reaction of NOx contained in the combustion exhaust gas Ge, causes heat exchange between the combustion exhaust gas Ge and water or steam in the upper heat exchanger 221, and discharges the combustion exhaust gas Ge from which NOx has been decomposed into the atmosphere from the upper end.

[0022] The direction in which the exhaust gas duct 224 flows the combustion exhaust gas Ge may be a direction other than the downward-to-upward direction shown in Fig. 1. For example, a modified example may be adopted in which the direction in which the exhaust gas duct 224 flows the combustion exhaust gas Ge is the upward-to-downward direction shown in Fig. 1. In this case, the reducing agent injection nozzle 223a is disposed above the upper heat exchanger 221. Also, for example, a modified example may be adopted in which the direction in which the exhaust gas duct 224 flows the combustion exhaust gas Ge is the horizontal direction.

[0023] The reducing agent supply unit 230 is a device that supplies a reducing agent to the reducing agent injection nozzle 223 a. The reducing agent supply unit 230 has a reducing agent storage tank 231, a flow rate adjustment valve 232, and a reducing agent supply pipe 233. The reducing agent supply unit 230 adjusts the opening degree of the flow rate adjustment valve 232 to adjust the flow rate of the reducing agent that is supplied from the reducing agent storage tank 231 to the reducing agent injection nozzle 223 a via the reducing agent supply pipe 233.

[0024] Next, with reference to Fig. 2, an exhaust gas analyzer 100 that is detachably attached to the heat recovery boiler 220 of this embodiment will be described. Fig. 2 is a partial enlarged view of the heat recovery boiler 220 shown in Fig. 1, showing the state in which the exhaust gas analyzer 100 is fixed to the mounting seat 225. As shown in Fig. 2, the heat recovery boiler 220 is provided with the exhaust gas analyzer 100. As shown in Fig. 2, the exhaust gas analyzer 100 has a sampling pipe 10, a reactor (reaction section) 20, a NOx measuring instrument (analysis section) 30, a supply pipe 40, and a suction section 50.

[0025] The sampling pipe 10 is a pipe for sampling the combustion exhaust gas Ge upstream of the denitration catalyst 223b in the exhaust gas duct 224 in the flow direction of the combustion exhaust gas Ge and guiding it to the outside of the exhaust gas duct 224. The sampling pipe 10 has a first pipe 11 that samples the combustion exhaust gas Ge flowing through the exhaust gas duct 224 and guides it to the reactor 20, and a second pipe 12 that guides the combustion exhaust gas Ge that has passed through the reactor 20 to the supply pipe 40. The sampling pipe 10 is formed of a metal material that is heat resistant to the combustion exhaust gas Ge. The sampling pipe 10 is arranged horizontally so as to be perpendicular to the outer peripheral surface of the exhaust gas duct 224.

[0026] 2, the entire first pipe 11 is disposed in the internal space S1 of the exhaust gas duct 224. On the other hand, the second pipe 12 has a first end 12a to which the reactor 20 is attached disposed in the internal space S1, and a second end 12b to which the supply pipe 40 is attached disposed in the external space S2 of the exhaust gas duct 224. The second pipe 12 is fixed to a mounting seat 225 fixed to the outer peripheral surface of the exhaust gas duct 224. The second pipe 12 has, for example, a flange portion 12c, and is fixed to a flange portion 225b of the mounting seat 225 by a fastener (not shown) with a packing 12d sandwiched therebetween.

[0027] The mounting seat 225 has a through-hole 225a with an inner diameter larger than the outer diameter of the sampling pipe 10 and the outer diameter of the reactor 20, and a flange portion 225b. The flange portion 12c of the second pipe 12 is inserted into the through-hole 225a and fixed to the flange portion 225b of the mounting seat 225 by a fastener (not shown). The gap between the flange portion 12c of the second pipe 12 and the flange portion 225b of the mounting seat 225 is sealed by a packing 12d, preventing communication between the internal space S1 and the external space S2.

[0028] The mounting seat 225 does not have to be a dedicated member provided for fixing the sampling pipe 10 of this embodiment, but may be a member that has been fixed in advance to the outer circumferential surface of the exhaust gas duct 224 for another purpose. Before the sampling pipe 10 is attached, for example, a pressure sensor 300 that measures the pressure in the internal space S1 of the exhaust gas duct 224 is fixed to the mounting seat 225, as shown in Fig. 3 . The sampling pipe 10 of this embodiment is attached to the mounting seat 225 after the pressure sensor 300 has been removed from the mounting seat 225.

[0029] Here, the pressure sensor 300 is attached to the mounting seat 225 before the sampling pipe 10 is attached, but a sensor other than the pressure sensor 300 (such as a temperature sensor) may be attached. Furthermore, the mounting seat 225 is normally sealed with a lid (not shown), and may be a gas sampling seat installed to sample gas inside the exhaust gas duct 224 as needed. In other words, the mounting seat 225 may be a measurement seat for measuring the internal environment of the exhaust gas duct 224.

[0030] The reactor 20 is attached to the first pipe 11 and the second pipe 12, and holds a denitration catalyst 21 therein for promoting a reduction reaction of NOx contained in the combustion exhaust gas Ge flowing through the first pipe 11 and the second pipe 12. The reactor 20 has, for example, a honeycomb shape, promotes a reduction reaction of NOx contained in the combustion exhaust gas Ge passing through its interior, and passes the combustion exhaust gas Ge toward the second pipe 12.

[0031] The denitration catalyst 21 held inside the reactor 20 converts ammonia (NH ) into NH 3 according to the above-mentioned reaction formulas (1), (2), and (3), similarly to the denitration catalyst 223b. ３ ) to decompose NOx. On the other hand, the denitration catalyst 21 has a different reaction performance with NOx than the denitration catalyst 223b (another denitration catalyst). For example, when comparing reaction performance with nitrogen dioxide per unit volume, the reaction rate with nitrogen dioxide of the denitration catalyst 21 is higher than the reaction rate with nitrogen dioxide of the denitration catalyst 223b.

[0032] 2 , the reactor 20 is disposed so as to be entirely exposed to the interior of the exhaust gas duct 224. Therefore, the reactor 20 and the denitration catalyst 21 disposed inside the reactor 20 are heated by the combustion exhaust gas Ge so that the temperatures of the reactor 20 and the denitration catalyst 21 disposed inside the reactor 20 are within a predetermined temperature range of the temperature of the denitration catalyst 223b disposed in the exhaust gas duct 224 (for example, equivalent to the temperature of the combustion exhaust gas Ge in the exhaust gas duct 224). Therefore, the exhaust gas analyzer 100 of this embodiment can promote the reduction reaction of the combustion exhaust gas Ge, in which the reduction reaction is promoted by the denitration catalyst 223b, by the denitration catalyst 21 under the same or similar temperature conditions, and analyze the reaction performance of the denitration catalyst 21 with nitrogen dioxide.

[0033] The NOx measuring instrument 30 is a device that analyzes the components of the combustion exhaust gas Ge in which the reduction reaction of NOx has been promoted by the denitration catalyst 21 of the reactor 20. The NOx measuring instrument 30 measures the concentrations of nitric oxide and nitrogen dioxide contained in the combustion exhaust gas Ge supplied from the supply pipe 40. The NOx measuring instrument 30 is equipped with a display device (not shown) that displays the measured concentrations of nitric oxide and nitrogen dioxide. Furthermore, instead of the display device, the NOx measuring instrument 30 may be equipped with a communication unit (not shown) that transmits the concentrations of nitric oxide and nitrogen dioxide to an external device (not shown).

[0034] The supply pipe 40 is a pipe that supplies the combustion exhaust gas Ge discharged from the second end 12b of the second pipe 12 to the NOx measuring instrument 30. The suction unit 50 is a device that guides the combustion exhaust gas Ge from the internal space S1 of the exhaust gas duct 224 to the NOx measuring instrument 30 via the sampling pipe 10. The suction unit 50 generates negative pressure to guide the combustion exhaust gas Ge present in the internal space S1 of the exhaust gas duct 224 from the sampling pipe 10 to the NOx measuring instrument 30 via the supply pipe 40.

[0035] Next, an exhaust gas analysis method using the exhaust gas analyzer 100 of this embodiment will be described with reference to the drawings. Fig. 4 is a flowchart showing the exhaust gas analysis method of this embodiment. In step S101, the exhaust gas analyzer 100 generates negative pressure using the suction unit 50, and samples the combustion exhaust gas Ge in the internal space S1 of the exhaust gas duct 224 using the sampling pipe 10.

[0036] In step S102, the exhaust gas analyzer 100 passes the combustion exhaust gas Ge through the reactor 20 to promote a reduction reaction of NOx contained in the combustion exhaust gas Ge in the reactor 20. The combustion exhaust gas Ge that has passed through the reactor 20 is supplied to the NOx measuring instrument 30 from the second pipe 12 via the supply pipe 40.

[0037] In step S103, the exhaust gas analyzer 100 uses the NOx measuring instrument 30 to analyze the components of the combustion exhaust gas Ge in which the reduction reaction of NOx has been promoted by the denitration catalyst 21 in the reactor 20. The NOx measuring instrument 30 measures the concentrations of nitrogen monoxide and nitrogen dioxide contained in the combustion exhaust gas Ge supplied from the supply piping 40, and displays the measured concentrations of nitrogen monoxide and nitrogen dioxide on a display unit (not shown). The exhaust gas analyzer 100 performs the processes of steps S101 to S103 described above periodically or at a timing instructed by an operator.

[0038] The functions and effects of the exhaust gas analyzer 100 and exhaust gas analysis method of this embodiment described above will be described. According to the exhaust gas analyzer 100 of this embodiment, the combustion exhaust gas Ge sampled upstream of the denitration catalyst 223b is guided to the outside of the exhaust gas duct 224 via the sampling pipe 10, and the reduction reaction of NOx contained in the combustion exhaust gas Ge is promoted by the reactor 20 attached to the sampling pipe 10. The NOx measuring instrument 30 measures the concentrations of nitric oxide and nitrogen dioxide contained in the combustion exhaust gas Ge whose reduction reaction has been promoted in the reactor 20. The reactor 20 is heated to a temperature within a predetermined temperature range together with the denitration catalyst 223b arranged in the exhaust gas duct 224.

[0039] Therefore, the exhaust gas analyzer 100 can promote the reduction reaction of NOx contained in the combustion exhaust gas Ge in the reactor 20 under environmental conditions equivalent to those of the denitration catalyst 223b, and can measure the concentrations of nitric oxide and nitrogen dioxide contained in the combustion exhaust gas Ge under environmental conditions equivalent to those of the denitration catalyst 223b using the NOx measuring instrument 30. That is, the exhaust gas analyzer 100 of this embodiment can analyze the reaction performance of the denitration catalyst 21 in the reactor 20, which is used to replace the denitration catalyst 223b, with respect to NOx contained in the combustion exhaust gas Ge under environmental conditions equivalent to those of the denitration catalyst 223b, without removing the denitration catalyst 223b installed in the exhaust gas duct 224.

[0040] According to the exhaust gas analyzer 100 of this embodiment, the reactor 20, which is disposed so as to be exposed to the inside of the exhaust gas duct 224, is heated by the combustion exhaust gas Ge flowing through the exhaust gas duct 224. Therefore, the reactor 20 can be kept at the same temperature as the denitration catalyst 223b in the exhaust gas duct 224.

[0041] According to the exhaust gas analysis device 100 of this embodiment, the sampling pipe 10 can be fixed to an existing mounting seat 225 into which a measuring instrument such as a pressure sensor 300 for measuring the internal environment of the exhaust gas duct 224 is inserted, so there is no need to provide a new mounting seat 225 to fix the sampling pipe 10 to the exhaust gas duct 224.

[0042] According to the exhaust gas analyzer 100 of this embodiment, by using the suction unit 50, the combustion exhaust gas Ge can be guided from the exhaust gas duct 224 to the NOx measuring instrument 30 via the sampling pipe 10. According to the exhaust gas analyzer 100 of this embodiment, the reaction performance of the denitration catalyst 21 of the reactor 20, which has a different reaction performance for NOx from that of the denitration catalyst 223b, can be analyzed under environmental conditions similar to those of the denitration catalyst 223b.

[0043] Second Embodiment Next, an exhaust gas analyzer 100A according to a second embodiment of the present disclosure will be described with reference to the drawings. This embodiment is a modification of the first embodiment, and is the same as the first embodiment except where specifically described below, and therefore, description thereof will be omitted below.

[0044] In the exhaust gas analyzer 100 of the first embodiment, the reactor 20 is installed in the internal space S1 of the exhaust gas duct 224, and the reactor 20 is heated by the combustion exhaust gas Ge, thereby making the environmental conditions of the reactor 20 the same as or similar to those of the denitration catalyst 223b. In contrast, in the exhaust gas analyzer 100A of the present embodiment, the reactor 20 is installed in the external space S2 of the exhaust gas duct 224, and the reactor 20 is heated by the heating unit 60, making the environmental conditions of the reactor 20 the same as or similar to those of the denitration catalyst 223b.

[0045] The sampling pipe 10A of this embodiment is a pipe for sampling the combustion exhaust gas Ge upstream of the denitration catalyst 223b in the exhaust gas duct 224 in the flow direction of the combustion exhaust gas Ge and guiding it to the outside of the exhaust gas duct 224. The sampling pipe 10A is a pipe for sampling the combustion exhaust gas Ge flowing through the exhaust gas duct 224 and guiding it to the reactor 20.

[0046] The sampling pipe 10A has a first end 10Aa disposed in the internal space S1 and a second end 10Ab disposed in the external space S2 of the exhaust gas duct 224. The sampling pipe 10A is fixed to a mounting seat 225 fixed to the outer peripheral surface of the exhaust gas duct 224.

[0047] 5, in the exhaust gas analyzer 100A of this embodiment, the reactor 20A has a denitration catalyst 21A and is disposed in the external space S2 of the exhaust gas duct 224. The reactor 20A is connected to the second end 10Ab of the sampling pipe 10A via a first pipe 41A of the supply pipe 40A, and is connected to the NOx measuring instrument 30 via a second pipe 42A of the supply pipe 40A.

[0048] As shown in FIG. 5 , the exhaust gas analyzer 100A of this embodiment includes a heating unit 60 that heats the reactor 20 so that the temperature of the denitration catalyst 223b disposed in the exhaust gas duct 224 is within a predetermined temperature range (e.g., equivalent to the temperature of the combustion exhaust gas Ge in the exhaust gas duct 224). The heating unit 60 sets the temperature of the heating unit 60, for example, by referring to a temperature output from a temperature sensor (not shown) that measures the temperature near the denitration catalyst 223b in the exhaust gas duct 224. The heating unit 60 is formed, for example, by an electric heating wire (not shown) disposed inside and a heat insulating material covering the electric heating wire. The heating unit 60 may be attached to the exhaust gas analyzer 100A so as to cover the first pipe 41A and the reactor 20 entirely, or may be attached to the exhaust gas analyzer 100A so as to cover the mounting seat 225, the first pipe 41A, and the reactor 20 entirely.

[0049] According to the exhaust gas analysis device 100A of this embodiment, the reactor 20 arranged outside the exhaust gas duct 224 is heated by the heating section 60 so that its temperature is within a predetermined temperature range of the denitration catalyst 223b, so that the reactor 20 can be kept at a temperature condition equivalent to that of the denitration catalyst 223b inside the exhaust gas duct 224.

[0050] Third Embodiment Next, an exhaust gas analyzer 100B according to a third embodiment of the present disclosure will be described with reference to the drawings. This embodiment is a modification of the first embodiment, and is considered to be the same as the first embodiment except where specifically described below, and therefore, description thereof will be omitted below.

[0051] The exhaust gas analyzer 100 of the first embodiment uses a single NOx measuring instrument 30 to analyze the components of combustion exhaust gas Ge that is collected from the internal space S1 of the exhaust gas duct 224 and reduced by the denitration catalyst 21 of the reactor 20. In contrast, the exhaust gas analyzer 100 of the second embodiment uses the NOx measuring instrument 30 to analyze the components of combustion exhaust gas Ge that is collected from the internal space S1 of the exhaust gas duct 224 and reduced by the denitration catalyst (first reaction section) 21 of the reactor 20, and further uses the NOx measuring instrument 30 to analyze the components of combustion exhaust gas Ge that is collected from the internal space S1 of the exhaust gas duct 224 and reduced by the denitration catalyst (second reaction section) 21B of the reactor 20B. Here, the denitration catalyst 21B is the same as the denitration catalyst 223b installed in the internal space S1 of the exhaust gas duct 224.

[0052] Fig. 6 is a partial enlarged view of the heat recovery steam generator, showing an exhaust gas analyzer 100B fixed to a mounting seat. As shown in Fig. 6, the exhaust gas analyzer 100B of this embodiment has a sampling pipe 10, a reactor (reaction section) 20, a NOx measuring instrument (analysis section) 30, a supply pipe 40, and a suction section 50. The exhaust gas analyzer 100B further has a sampling pipe 10B, a reactor (reaction section) 20B, a NOx measuring instrument (analysis section) 30B, a supply pipe 40B, and a suction section 50B.

[0053] The sampling pipe 10B is a pipe for sampling the combustion exhaust gas Ge upstream of the denitration catalyst 223b in the exhaust gas duct 224 in the flow direction of the combustion exhaust gas Ge and guiding it to the outside of the exhaust gas duct 224. The sampling pipe 10B has a first pipe 11B that samples the combustion exhaust gas Ge flowing through the exhaust gas duct 224 and guides it to the reactor 20B, and a second pipe 12B that guides the combustion exhaust gas Ge that has passed through the reactor 20B to the supply pipe 40B.

[0054] 6 , the entire first pipe 11B is disposed in the internal space S1 of the exhaust gas duct 224. On the other hand, the end of the second pipe 12B to which the reactor 20B is attached is disposed in the internal space S1, and the end of the second pipe 12B to which the supply pipe 40B is attached is disposed in the external space S2 of the exhaust gas duct 224. The second pipe 12B is fixed to a mounting seat 225B fixed to the outer peripheral surface of the exhaust gas duct 224.

[0055] The reactor 20B is attached to the first pipe 11B and the second pipe 12B and holds therein a denitration catalyst 21B for reducing the combustion exhaust gas Ge flowing through the first pipe 11B and the second pipe 12B. The reactor 20B has, for example, a honeycomb shape, reduces the combustion exhaust gas Ge passing through the inside thereof, and passes the reduced gas toward the second pipe 12B. The denitration catalyst 21B held therein by the reactor 20B is the same as the denitration catalyst (another denitration catalyst) supported by the denitration catalyst 223b.

[0056] Next, an exhaust gas analysis method using the exhaust gas analyzer 100 of this embodiment will be described with reference to the drawings. Fig. 7 is a flowchart showing the exhaust gas analysis method of this embodiment. In step S201 (first sampling step), the exhaust gas analyzer 100B generates negative pressure using the suction unit 50, and samples the combustion exhaust gas Ge in the internal space S1 of the exhaust gas duct 224 using the sampling pipe 10.

[0057] In step S202 (first reaction step), the exhaust gas analyzer 100B passes the combustion exhaust gas Ge through the reactor 20, and reduces the combustion exhaust gas Ge using the denitrification catalyst 21 of the reactor 20. The combustion exhaust gas Ge that has passed through the reactor 20 is supplied to the NOx measuring instrument 30 from the second pipe 12 via the supply pipe 40.

[0058] In step S203 (first analysis step), the exhaust gas analyzer 100 uses the first NOx measuring instrument 30 to analyze the components of the combustion exhaust gas Ge that has been reduced by the denitration catalyst 21 of the reactor 20. The NOx measuring instrument 30 measures the concentrations of nitrogen monoxide and nitrogen dioxide contained in the combustion exhaust gas Ge supplied from the supply pipe 40, and displays the measured concentrations of nitrogen monoxide and nitrogen dioxide on a display unit (not shown).

[0059] In step S204 (second sampling step), the exhaust gas analyzer 100B generates a negative pressure by the suction unit 50B, and samples the combustion exhaust gas Ge in the internal space S1 of the exhaust gas duct 224 through the sampling pipe 10B.

[0060] In step S205 (second reaction step), the exhaust gas analyzer 100B passes the combustion exhaust gas Ge through the reactor 20B, and reduces the combustion exhaust gas Ge using the denitrification catalyst 21B of the reactor 20B. The combustion exhaust gas Ge that has passed through the reactor 20B is supplied to the NOx measuring instrument 30B from the second pipe 12B via the supply pipe 40B.

[0061] In step S206 (second analysis step), the exhaust gas analyzer 100B uses the second NOx measuring instrument 30B to analyze the components of the combustion exhaust gas Ge that has been reduced by the denitration catalyst 21B of the reactor 20B. The NOx measuring instrument 30B measures the concentrations of nitrogen monoxide and nitrogen dioxide contained in the combustion exhaust gas Ge supplied from the supply pipe 40B, and displays the measured concentrations of nitrogen monoxide and nitrogen dioxide on a display unit (not shown).

[0062] Although steps S204 (second collection step) to S206 (second analysis step) have been executed after step S201 (first collection step) and step S203 (first analysis step) have been executed according to the flowchart shown in FIG. 7 , other configurations are also possible. For example, steps S204 (second collection step) to S206 (second analysis step) may be executed before steps S201 (first collection step) to S203 (first analysis step) are executed. Furthermore, steps S201 (first collection step) to S203 (first analysis step) and steps S204 (second collection step) to S206 (second analysis step) may be executed in parallel.

[0063] In step S207 (comparison step), exhaust gas analyzer 100B compares the measurement results (such as the concentrations of nitrogen monoxide and nitrogen dioxide) measured by first NOx measuring instrument 30 in step S203 with the measurement results measured by second NOx measuring instrument 30B in step S206. Exhaust gas analyzer 100B, for example, displays the measurement results measured by first NOx measuring instrument 30 and the measurement results measured by second NOx measuring instrument 30B on a display unit (not shown) so that they can be compared. Furthermore, exhaust gas analyzer 100B displays, for example, the difference between the concentrations of nitrogen monoxide and nitrogen dioxide measured by first NOx measuring instrument 30 and the concentrations of nitrogen monoxide and nitrogen dioxide measured by second NOx measuring instrument 30B on a display unit (not shown).

[0064] In this embodiment, two NOx measuring instruments 30, 30B are mounted on two mounting seats 225, 225B, respectively, but other configurations are also possible. For example, two NOx measuring instruments 30, 30B may be mounted sequentially on a single mounting seat 225, and the NOx measuring instrument 30 may analyze the components of the combustion exhaust gas Ge reduced by the denitration catalyst 21 of the reactor 20, and the NOx measuring instrument 30B may analyze the components of the combustion exhaust gas Ge reduced by the denitration catalyst 21B of the reactor 20B, consecutively. In this case, between steps S203 and S204 in FIG. 7 , steps are added to perform the following operations: replacing the sampling pipe 10 with the sampling pipe 10B, replacing the reactor 20 with the reactor 20B, replacing the NOx measuring instrument 30 with the NOx measuring instrument 30B, replacing the supply pipe 40 with the supply pipe 40B, and replacing the suction unit 50 with the suction unit 50B.

[0065] Furthermore, in the above, only the replacement of reactor 20 with reactor 20B may be performed, and the same sampling pipe 10, NOx measuring instrument 30, supply pipe 40, and suction section 50 may be used before and after the replacement of reactor 20 with reactor 20B.

[0066] According to the flue gas analysis method of this embodiment, in a first sampling step (S201), the combustion flue gas Ge sampled upstream of the denitration catalyst 223b is introduced to the outside of the flue gas duct 224, and in a first reaction step (S202), the combustion flue gas Ge is reduced by the denitration catalyst 21 of the reactor 20. In a first analysis step (S203), the components of the combustion flue gas Ge that has been reduced by the denitration catalyst 21 are analyzed. In addition, in a second sampling step (S204), the combustion flue gas Ge sampled upstream of the denitration catalyst 223b is introduced to the outside of the flue gas duct 224, and in a second reaction step (S205), the combustion flue gas Ge is reduced by the denitration catalyst 21B of the reactor 20B. In a second analysis step (S206), the components of the combustion flue gas Ge that has been reduced by the denitration catalyst 21B are analyzed. Then, in the comparison step (S207), the analysis result of the first analysis step (S203) is compared with the analysis result of the second analysis step (S206).

[0067] According to the exhaust gas analysis method of this embodiment, in the first reaction step (S202) and the second reaction step (S205), the combustion exhaust gas Ge is reduced by the denitration catalyst 21 and the denitration catalyst 21B under environmental conditions equivalent to those of the denitration catalyst 223b, and in the first analysis step (S203), the components of the combustion exhaust gas Ge reduced by the denitration catalyst 21 and the components of the combustion exhaust gas Ge reduced by the denitration catalyst 21B are analyzed under environmental conditions equivalent to those of the denitration catalyst 223b, and the analysis results can be compared. This makes it possible to analyze and compare the performance of the reduction treatment by the denitration catalyst 21 and the performance of the reduction treatment by the denitration catalyst 21B under environmental conditions equivalent to those of the denitration catalyst 223b.

[0068] [Fourth Embodiment] Next, an exhaust gas analyzer 100B according to a fourth embodiment of the present disclosure will be described with reference to the drawings. This embodiment is a modification of the first embodiment, and is considered to be the same as the first embodiment except where specifically described below, and therefore, description thereof will be omitted below.

[0069] The reactor 20 provided in the exhaust gas analyzer 100 of the first embodiment converts ammonia (NH ) into nitrogen oxides (NO ) according to the above-described reaction formulas (1), (2), and (3), in the same manner as the denitration catalyst 223b of the heat recovery boiler 220. ３ In contrast, the reactor 20 provided in the exhaust gas analyzer of this embodiment has an ammonia decomposition catalyst (not shown) that decomposes the ammonia mixed in the combustion exhaust gas Ge (predetermined reaction process).

[0070] The ammonia decomposition catalyst of this embodiment is a catalyst comprising a first component which is silica and / or zeolite supporting one or more noble metals selected from platinum (Pt), palladium (Pd), iridium (Ir), and rhodium (Rh), and a second component which is a composition comprising an oxide of one or more elements selected from titanium (Ti), tungsten (W), and vanadium (V).

[0071] The ammonia decomposition catalyst provided in the reactor 20 of this embodiment converts ammonia (NH ３) is subjected to a decomposition treatment (predetermined reaction treatment) to convert it into nitrogen or nitrogen oxides. ３ +30 ２ →2N2+6H ２ O (4) 4NH ３ +5O ２ → 4NO + 6H ２ O (5)

[0072] The ammonia decomposition catalyst provided in the reactor 20 of this embodiment decomposes ammonia using the second component according to the following formula (6) and removes at least a portion of the NO by-produced according to formula (5): ３ +4NO+O ２ →4N ２ +6H ２ O (6)

[0073] In this embodiment, the ammonia decomposition catalyst in the reactor 20 performs a decomposition process (predetermined reaction process) on the ammonia mixed in the combustion exhaust gas Ge, whereas the denitration catalyst 223b in the heat recovery boiler 220 converts NOx into ammonia (NH ３ ) and decomposes it through reduction treatment, and their main functions are different.

[0074] On the other hand, the denitration catalyst 223b provided in the heat recovery boiler 220 also decomposes ammonia into nitrogen through the above-mentioned reaction formulas (1), (2), and (3), and is therefore common in that it performs ammonia decomposition treatment (predetermined reaction treatment). The exhaust gas analyzer of this embodiment can compare the ammonia decomposition treatment performance with that of the denitration catalyst 223b by analyzing the components of the combustion exhaust gas Ge that has been decomposed of ammonia by the ammonia decomposition catalyst provided in the reactor 20.

[0075] The exhaust gas analyzer of this embodiment includes an ammonia measuring instrument (not shown) that measures the concentration of ammonia contained in the combustion exhaust gas Ge, instead of the NOx measuring instrument 30 of the first embodiment. The exhaust gas analyzer analyzes the concentration of ammonia contained in the combustion exhaust gas Ge that has been subjected to ammonia decomposition treatment by the ammonia decomposition catalyst of the reactor 20, thereby comparing the ammonia decomposition treatment performance with that of the denitration catalyst 223b.

[0076] [Other Embodiments] In the first embodiment, the sampling pipe 10 is arranged horizontally so as to be perpendicular to the outer peripheral surface of the exhaust gas duct 224, but other configurations are also possible. For example, as shown in a first modified example in Fig. 8, the sampling pipe 10 may be arranged so that its axis X forms an angle θ other than 90 degrees with respect to the outer peripheral surface of the exhaust gas duct 224. Furthermore, in other embodiments, the sampling pipe 10A may also be arranged so that its axis X forms an angle θ other than 90 degrees with respect to the outer peripheral surface of the exhaust gas duct 224.

[0077] In the first embodiment, the reactor 20 of the exhaust gas analyzer 100 is disposed near the first end 10Aa of the first pipe 11 of the sampling pipe 10 so that the entire reactor 20 is exposed to the internal space S1 of the exhaust gas duct 224, but other configurations are also possible. For example, as shown in a second modified example in Fig. 9, a part of the reactor 20 may be housed inside the mounting seat 225, and another part of the reactor 20 may be exposed to the internal space S1 of the exhaust gas duct 224.

[0078] In the second variant of the exhaust gas analysis device 100, a portion of the reactor 20 is housed inside the mounting seat 225, and therefore, compared to when the entire reactor 20 is exposed to the internal space S1 of the exhaust gas duct 224, the reactor 20 can be securely fixed to the exhaust gas duct 224 so that it is not subjected to vibrations or gravitational effects due to contact with the flow of combustion exhaust gas Ge.

[0079] In the above description, the sampling pipes 10, 10A, 10B are attached to the mounting seat 225 by fixing the flange portion 12c of the sampling pipes 10, 10A, 10B to the flange portion 225b of the mounting seat 225, but other configurations are also possible. For example, a male thread may be provided in place of the flange portion 12c of the sampling pipes 10, 10A, 10B, and a female thread may be provided on the inner circumferential surface of the through-hole 225a in place of the flange portion 225b of the mounting seat 225, and the sampling pipes 10, 10A, 10B may be attached to the mounting seat 225 by fastening the male thread and the female thread. In this case, it is preferable to use a seal packing to prevent combustion exhaust gas Ge from leaking from a gap between the male thread and the female thread.

[0080] The exhaust gas analyzer and the exhaust gas analysis method described in each of the above-described embodiments can be understood, for example, as follows: The exhaust gas analyzer according to a first aspect of the present disclosure is an exhaust gas analyzer (100) that is detachably attached to an exhaust gas treatment device (220) that includes an exhaust gas duct (224) through which exhaust gas discharged from a combustion device (210) flows and a reaction device (223b) that performs a predetermined reaction treatment on the exhaust gas flowing through the exhaust gas duct, the exhaust gas analyzer (100) including a pipe (10) for sampling the exhaust gas upstream of the reaction device in the exhaust gas duct and guiding it to the outside of the exhaust gas duct, a reaction unit (20) that is attached to the pipe and performs the predetermined reaction treatment on the exhaust gas flowing through the pipe, and an analysis unit (30) that analyzes components of the exhaust gas that has been subjected to the predetermined reaction treatment by the reaction unit.

[0081] According to the exhaust gas analyzer of the first aspect of the present disclosure, exhaust gas sampled upstream of the reaction device is guided to the outside of the exhaust gas duct through a pipe, and the exhaust gas undergoes a predetermined reaction process in a reaction unit attached to the pipe. The analysis unit analyzes the components of the exhaust gas that has undergone the predetermined reaction process in the reaction unit.

[0082] Because the same exhaust gas that is subjected to a predetermined reaction treatment by the reactor is collected through the pipe, the exhaust gas analyzer can perform the predetermined reaction treatment on the exhaust gas in the reaction section under environmental conditions equivalent to those of the reactor, and can analyze the components of the exhaust gas under environmental conditions equivalent to those of the reactor by the analysis section. That is, according to the exhaust gas analyzer according to the first aspect of the present disclosure, it is possible to analyze the performance of the predetermined reaction treatment on the exhaust gas by the reaction section that replaces the reactor, under environmental conditions equivalent to those of the reactor, without removing the reactor installed in the exhaust gas duct.

[0083] The exhaust gas analyzer according to the second aspect of the present disclosure is the first aspect, further comprising the following configuration: Namely, the reaction unit is heated to a temperature within a predetermined temperature range of the reaction device disposed in the exhaust gas duct. According to the exhaust gas analyzer according to the second aspect of the present disclosure, since the reaction unit is heated to a temperature within a predetermined temperature range of the reaction device disposed in the exhaust gas duct, the reaction unit can perform a predetermined reaction process on the exhaust gas under environmental conditions equivalent to those of the reaction device, and the analysis unit can analyze the components of the exhaust gas under environmental conditions equivalent to those of the reaction device.

[0084] The exhaust gas analyzer according to the third aspect of the present disclosure is the second aspect, further comprising the following configuration: The reaction unit is arranged so as to be exposed to the interior of the exhaust gas duct, and is heated by the exhaust gas flowing through the exhaust gas duct. According to the exhaust gas analyzer according to the third aspect of the present disclosure, the reaction unit is arranged so as to be exposed to the interior of the exhaust gas duct, and is heated by the exhaust gas flowing through the exhaust gas duct, so that the reaction unit can be kept at the same temperature as the reaction device inside the exhaust gas duct.

[0085] The exhaust gas analyzer according to the fourth aspect of the present disclosure is the second aspect, further comprising the following configuration: The reaction unit is disposed outside the exhaust gas duct, and includes a heating unit (60) that heats the reaction unit to a temperature within a predetermined temperature range that is the same as that of the reaction device disposed in the exhaust gas duct. According to the exhaust gas analyzer according to the fourth aspect of the present disclosure, the reaction unit disposed outside the exhaust gas duct is heated by the heating unit to a temperature within the predetermined temperature range that is the same as that of the reaction device, so that the reaction unit can be kept at a temperature condition equivalent to that of the reaction device within the exhaust gas duct.

[0086] An exhaust gas analyzer according to a fifth aspect of the present disclosure is any one of the first to fourth aspects, further comprising the following configuration: A mounting seat (225) is provided on the outer wall of the exhaust gas duct, into which a measuring instrument for measuring the internal environment of the exhaust gas duct is inserted, and the piping is fixed to the mounting seat from which the measuring instrument has been removed. According to the exhaust gas analyzer according to the fifth aspect of the present disclosure, the piping is fixed to an existing mounting seat into which a measuring instrument for measuring the internal environment of the exhaust gas duct is inserted, so there is no need to provide a new mounting seat for fixing the piping to the exhaust gas duct.

[0087] The exhaust gas analyzer according to a sixth aspect of the present disclosure is any one of the first to fourth aspects, further comprising the following configuration: an intake unit (50) for guiding the exhaust gas from the exhaust gas duct to the analysis unit via the piping. According to the exhaust gas analyzer according to the sixth aspect of the present disclosure, the exhaust gas can be guided from the exhaust gas duct to the analysis unit via the piping by using the intake unit.

[0088] An exhaust gas analyzer according to a seventh aspect of the present disclosure is any one of the first to fourth aspects, further comprising the following configuration: The reaction unit performs a reduction treatment to reduce nitrogen oxides contained in the exhaust gas flowing through the piping. With the exhaust gas analyzer according to the seventh aspect of the present disclosure, it is possible to analyze the performance of the reduction treatment of nitrogen oxides on exhaust gas by a reaction unit that replaces a reaction device installed in an exhaust gas duct under environmental conditions equivalent to those of the reaction device, without removing the reaction device.

[0089] An exhaust gas analyzer according to an eighth aspect of the present disclosure is the same as the seventh aspect, further comprising the following configuration: the exhaust gas is mixed with a reducing agent for reducing the nitrogen oxides, and the reaction section has a denitration catalyst for reducing the nitrogen oxides with the reducing agent, the reduction catalyst having a different reduction treatment performance from other denitration catalysts contained in the reaction device. The exhaust gas analyzer according to the eighth aspect of the present disclosure can analyze the performance of the denitration catalyst contained in the reaction section having a different reduction treatment performance from other denitration catalysts contained in the reaction device under environmental conditions similar to those of the reaction device.

[0090] The exhaust gas analyzer according to a ninth aspect of the present disclosure is the same as any one of the first to fourth aspects, further comprising the following configuration: The reaction unit performs a decomposition process to decompose ammonia contained in the exhaust gas flowing through the piping. According to the exhaust gas analyzer according to the ninth aspect of the present disclosure, the performance of the ammonia decomposition process performed by the reaction unit on the exhaust gas can be analyzed under environmental conditions equivalent to those of the reaction unit, without removing the reaction unit installed in the exhaust gas duct.

[0091] An exhaust gas analysis method according to a tenth aspect of the present disclosure is an exhaust gas analysis method for analyzing exhaust gas treated in an exhaust gas treatment device that includes an exhaust gas duct through which exhaust gas discharged from a combustion device flows and a reaction device provided in the exhaust gas duct that performs a predetermined reaction treatment on the exhaust gas, and includes a first sampling step (S101, S201) of sampling the exhaust gas upstream of the reaction device from the exhaust gas duct and sampling it into a pipe for leading it to the outside of the exhaust gas duct, a first reaction step (S102, S202) of performing the predetermined reaction treatment on the exhaust gas that has been led to the pipe in the first sampling step, and a first analysis step (S103, S203) of analyzing the components of the exhaust gas that has undergone the predetermined reaction treatment in the first reaction step.

[0092] According to the exhaust gas analysis method of the tenth aspect of the present disclosure, in the first sampling step, exhaust gas sampled upstream of the reaction device is guided to the outside of the exhaust gas duct through a pipe, and in the first reaction step, the exhaust gas is subjected to a predetermined reaction process in a first reaction section attached to the pipe. In the first analysis step, the components of the exhaust gas that have been subjected to the predetermined reaction process in the first reaction section are analyzed.

[0093] According to the exhaust gas analysis method of the tenth aspect of the present disclosure, the same exhaust gas as that subjected to a predetermined reaction treatment by the reaction device is collected, and therefore the predetermined reaction treatment is performed on the exhaust gas under environmental conditions equivalent to those of the reaction device in the first reaction step, and the components of the exhaust gas can be analyzed under environmental conditions equivalent to those of the reaction device in the first analysis step. In other words, according to the exhaust gas analysis method of the tenth aspect of the present disclosure, the performance of the predetermined reaction treatment on the exhaust gas by the first reaction unit for replacing the reaction device installed in the exhaust gas duct can be analyzed under environmental conditions equivalent to those of the reaction device, without removing the reaction device.

[0094] An exhaust gas analysis method according to an eleventh aspect of the present disclosure is the tenth aspect, further comprising the following configuration: That is, in the first reaction step, the reaction treatment is performed with the reaction device disposed in the exhaust gas duct at a temperature within a predetermined temperature range. According to the exhaust gas analysis method according to the eleventh aspect of the present disclosure, since the first reaction step performs the reaction treatment with the reaction device disposed in the exhaust gas duct at a temperature within a predetermined temperature range, the first reaction step performs the predetermined reaction treatment on the exhaust gas under environmental conditions equivalent to those of the reaction device, and the first analysis step can analyze the components of the exhaust gas under environmental conditions equivalent to those of the reaction device.

[0095] An exhaust gas analysis method according to a twelfth aspect of the present disclosure is the tenth or eleventh aspect, further comprising the following configuration: a second sampling step (S204) of sampling the exhaust gas upstream of the reaction device from the exhaust gas duct, a second reaction step (S205) of subjecting the exhaust gas sampled in the second sampling step to the predetermined reaction treatment by a second reaction section, a second analysis step (S206) of analyzing components of the exhaust gas that has undergone the predetermined reaction treatment by the second reaction step, and a comparison step (S207) of comparing the analysis results of the first analysis step and the second analysis step.

[0096] According to the exhaust gas analysis method according to the twelfth aspect of the present disclosure, in the second sampling step, exhaust gas sampled upstream of the reaction device is guided to the outside of the exhaust gas duct, and in the second reaction step, the exhaust gas is subjected to a predetermined reaction process in the second reaction section. In the second analysis step, the components of the exhaust gas that has undergone the predetermined reaction process in the second reaction section are analyzed. Then, in the comparison step, the analysis results of the first analysis step and the second analysis step are compared.

[0097] According to the exhaust gas analysis method of the twelfth aspect of the present disclosure, in the first reaction step and the second reaction step, exhaust gas is subjected to a predetermined reaction treatment by the first reaction section and the second reaction section under environmental conditions equivalent to those of the reaction device, and in the first analysis step, the components of the exhaust gas treated by the reaction treatment by the first reaction section and the components of the exhaust gas treated by the reaction treatment by the second reaction section are analyzed under environmental conditions equivalent to those of the reaction device, and the analysis results can be compared. This makes it possible to analyze and compare the performance of the predetermined reaction treatment by the first reaction section and the performance of the predetermined reaction treatment by the second reaction section under environmental conditions equivalent to those of the reaction device.

[0098] 10, 10A Sampling pipe 10Aa First end 10Ab Second end 11 First pipe 12 Second pipe 12a First end 12b Second end 20, 20A Reactor 21 Denitrification catalyst 30 NOx measuring device 40, 40A Supply pipe 41A First pipe 42A Second pipe 50 Suction section 60 Heating section 100, 100A Exhaust gas analyzer 200 Gas turbine combined cycle power generation facility 210 Gas turbine (combustion device) 211 Compressor 212 Combustor 213 Turbine 214 Generator 220 Exhaust heat recovery boiler (exhaust gas treatment device) 221 Upper heat exchanger 221a Heat transfer tube 222 Lower heat exchanger 222a Heat transfer tube 223 Denitrification device (reaction device) 223a Reducing agent injection nozzle 223b Denitrification catalyst 224 Exhaust gas duct 225 Mounting seat 225a Through hole 230 Reducing agent supply unit 231 Reducing agent storage tank 232 Flow rate adjustment valve 233 Reducing agent supply pipe 300 Pressure sensor Ge Combustion exhaust gas HD Height direction S1 Internal space S2 External space X Axis θ Angle

Claims

1. An exhaust gas analyzer that is detachably attached to an exhaust gas treatment device that includes an exhaust gas duct through which exhaust gas emitted from a combustion device flows and a reaction device that performs a predetermined reaction treatment on the exhaust gas flowing through the exhaust gas duct, the exhaust gas analyzer comprising: a pipe for collecting the exhaust gas upstream of the reaction device from the exhaust gas duct and guiding it to the outside of the exhaust gas duct; a reaction unit that is attached to the pipe and performs the predetermined reaction treatment on the exhaust gas flowing through the pipe; and an analysis unit that analyzes the components of the exhaust gas that has been subjected to the predetermined reaction treatment by the reaction unit.

2. An exhaust gas analyzer according to claim 1, wherein the reaction section is heated to a temperature within a predetermined temperature range of the reaction device disposed in the exhaust gas duct.

3. An exhaust gas analyzer according to claim 2, wherein the reaction section is arranged so as to be exposed inside the exhaust gas duct and is heated by the exhaust gas flowing through the exhaust gas duct.

4. An exhaust gas analyzer as described in claim 2, wherein the reaction section is arranged outside the exhaust gas duct, and the exhaust gas analyzer is provided with a heating section that heats the reaction section to a temperature within a predetermined temperature range in conjunction with the reaction device arranged in the exhaust gas duct.

5. An exhaust gas analyzer according to any one of claims 1 to 4, wherein a mounting seat into which a measuring instrument for measuring the internal environment of the exhaust gas duct is inserted is provided on the outer wall of the exhaust gas duct, and the piping is fixed to the mounting seat from which the measuring instrument has been removed.

6. An exhaust gas analyzer according to any one of claims 1 to 4, further comprising a suction section for guiding the exhaust gas from the exhaust gas duct to the analysis section via the piping.

7. An exhaust gas analyzer according to any one of claims 1 to 4, wherein the reaction section performs a reduction treatment to reduce nitrogen oxides contained in the exhaust gas flowing through the piping.

8. An exhaust gas analyzer according to claim 7, wherein the exhaust gas is mixed with a reducing agent for reducing the nitrogen oxides, the reaction section has a denitration catalyst for reducing the nitrogen oxides with the reducing agent, and the denitration catalyst has reduction treatment performance different from that of other denitration catalysts contained in the reaction device.

9. An exhaust gas analyzer according to any one of claims 1 to 4, wherein the reaction section performs a decomposition process to decompose ammonia contained in the exhaust gas flowing through the piping.

10. An exhaust gas analysis method for analyzing exhaust gas treated in an exhaust gas treatment device comprising an exhaust gas duct through which exhaust gas discharged from a combustion device flows and a reaction device provided in the exhaust gas duct to perform a predetermined reaction treatment on the exhaust gas, the method comprising: a first sampling step of sampling the exhaust gas upstream of the reaction device from the exhaust gas duct and sampling it into a pipe for leading it to the outside of the exhaust gas duct; a first reaction step of performing the predetermined reaction treatment on the exhaust gas led to the pipe in the first sampling step; and a first analysis step of analyzing the components of the exhaust gas that has been subjected to the predetermined reaction treatment in the first reaction step.

11. The exhaust gas analysis method according to claim 10, wherein the first reaction step involves carrying out the reaction treatment with the reaction device disposed in the exhaust gas duct at a temperature within a predetermined temperature range.

12. An exhaust gas analysis method as described in claim 10 or claim 11, comprising: a second sampling step of sampling the exhaust gas upstream of the reaction device in the exhaust gas duct; a second reaction step of subjecting the exhaust gas sampled in the second sampling step to the specified reaction treatment by a second reaction section; a second analysis step of analyzing the components of the exhaust gas that has undergone the specified reaction treatment by the second reaction step; and a comparison step of comparing the analysis results of the first analysis step and the second analysis step.

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