JP5154131B2 - Boiler and boiler operation method - Google Patents

Description

  The present invention relates to a boiler and a method for operating the boiler.

Conventionally, a method for monitoring corrosion on an exhaust gas passage has been proposed in order to reduce corrosion of components on the exhaust gas passage of a boiler. For example, Patent Document 1 discloses a probe that is installed on an exhaust gas flow path, and a method of operating while monitoring corrosion using such a probe is conceivable. A sample electrode is provided on the probe. In this method, the corrosion rate of the sample electrode is detected based on the polarization resistance measured by polarizing the sample electrode.
JP 2005-91281 A

  However, in the above method, the corrosion rate of the sample electrode of the probe and the progress of corrosion in the actual boiler components may not always be linked accurately, so operation based on the monitored corrosion rate is not possible. Even if it does, corrosion suppression may not be performed properly. In recent years, in particular, this type of boiler is required to cope with fuels whose properties are not stable, and in order to extend the life of the boiler, it is desired to suppress corrosion of components due to exhaust gas as much as possible. ing.

  Then, an object of this invention is to provide the boiler which can aim at suppression of the corrosion of the components by waste gas appropriately, and the operating method of a boiler.

  The inventors of the present invention conducted intensive research on the corrosion of parts on the exhaust gas flow path of the boiler. The corrosion of such boiler parts involves Cl (chlorine atoms) present in the exhaust gas, but the present inventors, among the compounds containing Cl in the exhaust gas, are particulate particles containing Cl. It has been found that the salt has a great influence on the progress of the corrosion of the boiler parts, and the gas containing Cl does not have a great influence. Therefore, it is not sufficient to simply monitor the concentration of Cl in the exhaust gas in order to accurately estimate the ease of corrosion of the parts. The concentration of Cl that forms particulate salts in the exhaust gas is not sufficient. I found it necessary to monitor.

Based on such knowledge, the boiler of the present invention includes a combustion furnace that burns fuel that is input, and a cyclone that separates solid particles from combustion gas generated from the combustion furnace and sends exhaust gas from which solid particles have been removed to the subsequent stage. And a heat recovery part that recovers the heat of the exhaust gas in the latter stage of the cyclone, and an exhaust gas that passes through the heat recovery part from the exhaust gas flow path in the latter stage of the cyclone, and forms particulate salts in the exhaust gas It is characterized by comprising concentration acquisition means for acquiring the concentration of Cl, and fuel adjustment means for adjusting the fuel to be fed into the combustion furnace based on the concentration acquired by the concentration acquisition means.

  In this boiler, the concentration of Cl forming particulate salt in the exhaust gas is acquired by the concentration acquisition means. This concentration is an amount that greatly affects the progress of corrosion of the parts that come into contact with the exhaust gas, and reflects the ease of corrosion of the parts relatively accurately. Then, the fuel adjusting means adjusts the fuel to be introduced into the combustion furnace based on the acquired concentration. Therefore, according to this boiler, it becomes possible to adjust a fuel according to the risk of corrosion of parts, and corrosion of parts can be suppressed appropriately.

Further, the boiler of the present invention includes a combustion furnace that burns fuel that has been input, a concentration acquisition unit that acquires the concentration of Cl that forms particulate salt in the exhaust gas generated from the combustion furnace, and a concentration acquisition unit And a fuel adjusting means for adjusting the fuel to be introduced into the combustion furnace based on the concentration acquired in step (1), wherein the concentration acquiring means forms Cl and particulate salt that are present in the form of gas in the exhaust gas. A first measuring means for measuring the concentration of Cl including Cl, and a second measuring means for measuring the concentration of Cl present in the form of gas in the exhaust gas, and obtained by the first measuring means. A concentration of Cl forming a particulate salt is obtained based on the concentration of Cl obtained and the concentration of Cl obtained by the second measuring means .

  The concentration of Cl that forms particulate salts in exhaust gas is relatively difficult to measure directly, but in contrast, it forms particulate salts with Cl that is present in gaseous form in exhaust gases. The concentration of Cl including Cl and the concentration of Cl existing in a gaseous state are relatively easy to measure. Therefore, according to the above configuration, the concentration of Cl forming the particulate salt can be obtained relatively easily.

In addition, the concentration acquisition means acquires the concentration of Cl that forms particulate salt in the exhaust gas by analyzing the exhaust gas acquired by the gas acquisition means and the gas collection means for collecting the exhaust gas from the exhaust gas flow path. Gas sampling means for collecting the exhaust gas by sucking the exhaust gas in a direction opposite to the flow direction of the exhaust gas in the flow path. According to this configuration, an appropriate amount of gas can be collected by the gas collecting means.
In addition, the boiler of the present invention obtains exhaust gas from a combustion furnace that burns fuel that has been input and a flow path of exhaust gas generated from the combustion furnace, and the concentration of Cl that forms particulate salt in the exhaust gas Concentration acquisition means for acquiring the fuel, and fuel adjustment means for adjusting the fuel to be introduced into the combustion furnace based on the concentration acquired by the concentration acquisition means, the concentration acquisition means collecting the exhaust gas from the exhaust gas flow path Gas collecting means, and gas analyzing means for analyzing the exhaust gas obtained by the gas obtaining means to obtain the concentration of Cl forming a particulate salt in the exhaust gas, the gas collecting means, The exhaust gas is sucked and collected in a direction opposite to the flow direction of the exhaust gas in the flow path.

Further, the boiler operating method of the present invention includes a combustion furnace for burning the input fuel, a cyclone for separating the solid particles from the combustion gas generated from the combustion furnace, and sending the exhaust gas from which the solid particles have been removed to the subsequent stage, A boiler operating method for operating a boiler comprising a heat recovery unit that recovers heat of exhaust gas at a subsequent stage of a cyclone , a fuel input process for supplying fuel to a combustion furnace of the boiler, and a flow of exhaust gas at a subsequent stage of the cyclone Based on the concentration acquisition step of acquiring exhaust gas passing through the heat recovery section from the passage and acquiring the concentration of Cl forming particulate salt in the exhaust gas, and the concentration acquired in the concentration acquisition step, the fuel And a fuel adjustment step of adjusting the fuel to be input in the input step.

In this operation method, the concentration of Cl forming particulate salt in the exhaust gas is acquired by the concentration acquisition step. This concentration is an amount that greatly affects the progress of corrosion of the parts that come into contact with the exhaust gas, and reflects the ease of corrosion of the parts relatively accurately. In the fuel adjustment step, the fuel that is input to the combustion furnace in the fuel input step is adjusted based on the acquired concentration. Therefore, according to this method, it becomes possible to adjust the fuel according to the risk of corrosion of parts, and corrosion of parts can be suppressed appropriately.
In addition, the boiler operating method of the present invention includes a fuel injection step of supplying fuel to a boiler combustion furnace, and obtaining exhaust gas from a flow path of exhaust gas generated from the combustion furnace to form particulate salt in the exhaust gas. A concentration acquisition step for acquiring the concentration of Cl, and a fuel adjustment step for adjusting the fuel to be input in the fuel input step based on the concentration acquired in the concentration acquisition step. A first measuring step for measuring the concentration of Cl including Cl present in a gaseous state and Cl forming a particulate salt, and the concentration of Cl present in a gaseous state in the exhaust gas; And forming a particulate salt based on the concentration of Cl obtained in the first measurement step and the concentration of Cl obtained in the second measurement step. It is characterized in that the concentration of Cl is obtained.

  According to the boiler and the operation method of the boiler of the present invention, corrosion of the components of the boiler can be appropriately suppressed.

  DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of a boiler and a boiler operation method according to the present invention will be described in detail with reference to the drawings.

  An external circulation type (Circulating Fluidized Bed type) fluidized bed boiler 1 shown in FIG. 1 is a boiler using wood chips, tires, RPF or the like as fuel, and includes a fluidized bed type combustion furnace 3 having a vertically long cylindrical shape. Yes. A fuel inlet 3a for introducing fuel is provided in the middle part of the combustion furnace 3, and a gas outlet 3b for discharging combustion gas is provided in the upper part. A cyclone 7 that functions as a solid-gas separator is connected to the gas outlet 3b. The discharge port 7a of the cyclone 7 is connected to a downstream gas processing system via a gas line. A return line 9 called a downcomer extends downward from the bottom outlet of the cyclone 7, and the lower end of the return line 9 is connected to the intermediate side surface of the combustion furnace 3.

  In the combustion furnace 3, the solid material containing the fuel introduced from the inlet 3a flows by the combustion / flowing air introduced from the lower air supply line 3c, and the fuel flows about 800 to 900 while flowing. Burn at ℃. The combustion gas generated in the combustion furnace 3 is introduced into the cyclone 7 with accompanying solid particles. The cyclone 7 separates solid particles and gas by a centrifugal separation action, returns the separated solid particles to the combustion furnace 3 through the return line 9, and sends the combustion gas from which the solid particles have been removed from the discharge port 7 a through the gas line. It is sent to the gas processing system at the subsequent stage.

  In this combustion furnace 3, a solid substance called “in-furnace bed material” is generated and collected at the bottom, and the bed material is sintered and melted and solidified by the concentration of impurities (low melting point materials, etc.) in the in-furnace bed material. Alternatively, it is necessary to suppress malfunctions caused by incombustibles. For this reason, in the combustion furnace 3, the in-furnace bed material is periodically discharged from the bottom discharge port 3 d to the outside. The discharged bed material is returned again to the combustion furnace 3 through a circulation line (not shown). In addition, the fuel used in the boiler 1 often contains unsuitable materials such as metals that are unsuitable for combustion. Therefore, in order to remove the unsuitable materials from the combustion furnace 3, the fuel is used on the circulation line. Is provided with a sorting device having a sieve and a magnetic separation device.

  The gas treatment system includes a gas heat exchanger 13 connected to the gas outlet 7a of the cyclone 7 via a gas line, and a bug connected to the outlet 13a of the gas heat exchanger 13 via a gas line. And a filter (dust collector) 15. The gas heat exchanger 13 is provided with a boiler tube 13b that allows water to flow across the exhaust gas flow path. When the high-temperature exhaust gas sent from the cyclone 24 comes into contact with the boiler tube 13b, the heat of the exhaust gas is recovered in the water in the tube, and the generated high-temperature steam is sent to the power generation turbine through the boiler tube 13b. The bag filter 15 removes fine particles such as fly ash that are still accompanying the combustible gas. The clean gas discharged from the discharge port 15a of the bag filter 15 is discharged from the chimney 19 via the gas line and the pump 17 to the outside.

  As described above, in this boiler 1, wood chips, tires, RPF, and the like are used as fuel, and the combustion furnace 3 generates exhaust gas containing chlorine. Such chlorine is contained in the gas and particles constituting the exhaust gas. Since this exhaust gas passes through the gas heat exchanger 13 while contacting the boiler tube 13b containing iron as a main component, it becomes a problem that particles in the exhaust gas adhere to the boiler tube 13b and corrode. In addition, since the fuel contains waste having uneven properties, the properties of the generated exhaust gas are not constant, and the ease of corrosion of the boiler tube 13b caused by the exhaust gas varies. Therefore, during operation of the boiler 1, the exhaust gas contacting the boiler tube 13b is monitored, and if it is determined that the ease of corrosion of the boiler tube 13b has increased beyond the specified level, the property of the exhaust gas should be changed. It is necessary to take measures such as adjusting the fuel supply system and changing the properties and quantity of the fuel to be introduced.

Further, in the exhaust gas of the boiler 1, Cl (chlorine atom) that causes corrosion forms a particulate salt such as NaCl, KCl, or ZnCl ₂ , for example, HCl, Cl _2, or the like. It exists in a state where gas (gas) molecules are formed. Here, according to the study by the present inventors, among the Cl compounds present in the exhaust gas of the boiler 1, in particular, the main cause of corrosion caused by adhesion of particulate salt containing Cl to the boiler tube 13b. On the other hand, it has been found that the gas containing Cl does not significantly affect the corrosion of iron parts. Further, among the particulate salts containing Cl, it has been found that fine particles having a small particle size (particle size of 1 μm or less) are particularly likely to cause corrosion. And it discovered that the ease of corrosion of iron parts, such as the boiler tube 13b, had a high correlation with the density | concentration of Cl which has formed the particulate salt in waste gas.

  In general, in the exhaust gas generated from a boiler, the distribution of the particle size of the salt particles containing Cl is biased toward a small particle size, and most of the salt particles containing Cl are contained in particles having a particle size of 1 μm or less. Included. Therefore, in the boiler 1 as well, most of the particulate salts containing Cl in the exhaust gas have a small particle size, and it can be considered that most of them form particles having a particle size of 1 μm or less.

  Based on the above knowledge, in the operation of the boiler 1, the concentration of Cl forming a particulate salt having a predetermined particle size or less (for example, a particle size of 1 μm or less here) is monitored, and based on this concentration. Thus, the corrosion of the boiler tube 13b is suppressed by adjusting the fuel to be input.

  Specifically, in order to enable such operation, the boiler 1 includes a monitoring probe 31 for collecting the exhaust gas flowing in the vicinity of the boiler tube 13b and a gas analysis for analyzing the exhaust gas collected by the probe 31. An apparatus 40; a fuel control unit 47 that performs processing based on a signal from the gas analyzer 40; and a fuel input device 49 that supplies fuel to the input port 3a in accordance with a control signal from the fuel control unit 47. ing.

  As shown in FIG. 2, the probe 31 protrudes horizontally into the gas heat exchanging portion 13 at the tip end side having a cylindrical shape at a position upstream of the boiler tube 13 b of the gas heat exchanging portion 13. Is provided. The probe 31 has an outer tube 33 that comes into contact with high-temperature exhaust gas, an inner tube 35 provided concentrically inside the outer tube 33, and a gas sampling tube 37 provided further inside the inner tube 35. ing.

  A water supply port 33 a for supplying cooling water to the outer tube 33 and a drain port 35 a for discharging cooling water from the inner tube 35 are provided on the proximal end side of the probe 31 outside the gas heat exchange unit 13. . The cooling water introduced from the water supply port 33a flows between the outer tube 33 and the inner tube 35 toward the distal end, and further flows between the inner tube 35 and the gas sampling tube 37 toward the proximal end. It is discharged from the drain port 35a. The probe 31 exposed to the exhaust gas is cooled by the cooling water, and damage due to high temperature is prevented.

  The gas sampling tube 37 has a distal end bent downward, and extends from a gas sampling port 33 a provided on the lower side surface of the distal end side of the outer tube 33 to a gas extraction port 37 b on the proximal end side. Since the inside and outside of the gas heat exchanging section 13 are communicated with each other by the gas sampling pipe 37, the exhaust gas flowing in the gas heat exchanging section 13 by the suction from the gas outlet port 37b is converted into particles contained in the exhaust gas. Can be collected together.

  Here, at the position of the probe 31 in the gas heat exchanging section 13, the exhaust gas flows downward, whereas the gas sampling port 33a is provided on the lower surface of the probe 31 as described above, and the gas sampling port 37a Gas is sucked upward against the flow of exhaust gas. As described above, according to the configuration in which the gas sampling port 33a is provided on the downstream side of the outer surface of the probe 31, the large particle size particles in the exhaust gas are not sucked into the gas sampling port 37a because of their large weight. Light and small-sized particles go around the side surface of the probe 31 and are sucked from the gas sampling port 37a.

  Therefore, according to this probe 31, it is possible to selectively collect only particles having a desired particle diameter or less by appropriately adjusting the suction force of the gas sampling tube 37. Here, the suction force of the gas sampling tube 37 is adjusted so as to collect only particles having a particle diameter of 1 μm or less. In addition, since the gas sampling port 37a does not face the flow direction of the exhaust gas, there is an effect that the gas sampling tube 37 is prevented from being blocked by taking in large particles. The exhaust gas collected by such a gas sampling tube 37 contains particles having a particle size of 1 μm or less, and is sent to the gas analyzer 40 through the gas extraction port 37b.

  As shown in FIG. 3, the gas analyzer 40 includes a first analyzer 41 and a second analyzer 42. The exhaust gas introduced into the gas analyzer 40 is divided into two and introduced into the first and second analyzers 41 and 42, respectively.

  In the first analysis unit 41, the introduced exhaust gas is blown into the absorption liquid by the gas absorption unit 412. Among the Cl contained in the exhaust gas, the absorption liquid in the gas absorption part 412 includes both Cl that has formed a particulate salt having a particle size of 1 μm or less and Cl that has existed in a gas state. It is absorbed and dissolved as Cl ions. This absorption liquid is sent to the filtration part 413, is filtered, and is separated into a solid component and a filtrate. The separated solid component is discharged out of the system, and the filtrate is sent to the filtrate analysis unit 414. In the filtrate analysis unit 414, the Cl ion concentration a2 in the filtrate is measured, and the volume a3 of the filtrate is measured. These measured values a2 and a3 are sent to the first calculation unit 415. On the other hand, the gas that has passed through the absorbing solution in the gas absorbing unit 412 is sent to the gas amount measuring unit 416, and the volume a1 is measured. The measurement value a1 is sent to the first calculation unit 415.

The first calculation unit 415 performs the calculation of the following expression (1) based on the input measurement values a1, a2, and a3, and sends the obtained value a to the third calculation unit 43.
a = a2 / a3 / a1 (1)
Here, considering the meaning of the value a, the value a indicates the concentration of Cl in the exhaust gas. This Cl is a gas state with Cl forming a particulate salt with a particle size of 1 μm or less. It is a combination of both Cl and C.

  On the other hand, in the second analysis unit 42, the introduced exhaust gas passes through the filter 420. In the filter 420, particles introduced together with the exhaust gas are removed. Therefore, of the Cl contained in the exhaust gas, Cl that has formed a particulate salt having a particle size of 1 μm or less is removed out of the system by the filter 420. On the other hand, the gas that has passed through the filter 420 is sent to the gas absorption unit 422 and blown into the absorption liquid. In the absorption liquid obtained by the gas absorption part 422, Cl that is present in the state of gas in the exhaust gas is absorbed and dissolved as Cl ions. This absorption liquid is sent to the absorption liquid analysis unit 424, and the Cl ion concentration b2 is measured and the volume b3 of the absorption liquid is measured. These measurement values b2 and b3 are sent to the second calculation unit 425. On the other hand, the gas that has passed through the absorbing solution in the gas absorbing unit 422 is sent to the gas amount measuring unit 426, and the volume b1 is measured. The measurement value b1 is sent to the second calculation unit 425.

The second calculation unit 425 performs calculation of the following expression (2) based on the input measurement values b1, b2, and b3, and sends the obtained value b to the third calculation unit 43.
b = b2 / b3 / b1 (2)
Here, considering the meaning of the value b, the value b indicates the concentration of Cl in the exhaust gas. In this case, Cl includes only Cl that is present in the state of gas in the exhaust gas.

The third calculator 43 calculates the following expression (3) based on the input values a and b, outputs the obtained value D as a signal, and sends it to the fuel controller 47.
D = a−b (3)
Here, the value D indicates the concentration of Cl that has formed a particulate salt having a particle size of 1 μm or less in the exhaust gas. Therefore, as D is larger, the exhaust gas contains more substances that cause corrosion of the boiler tube 13b, which means that the boiler tube 13b is more easily corroded.

  With the above mechanism, the probe 31 and the gas analyzer 41 automatically measure the concentration of Cl forming particulate salt having a particle size of 1 μm or less in the exhaust gas and send it to the fuel control unit 47 ( Concentration acquisition step). Originally, it is difficult to directly measure the concentration (value D) of Cl forming the particulate salt alone, but in the gas analyzer 41, the value a and the value that are relatively easy to measure. The necessary value D can be calculated by measuring b and calculating the difference between the two. Thereafter, the fuel control unit 47 compares the value of D sent from the gas analyzer 41 with a predetermined specified value. If the value is equal to or greater than the specified value, the fuel input device 49 adjusts the fuel input amount. A predetermined control signal to be instructed is transmitted.

  The fuel injection device 49 has a screw part that conveys fuel, and rotates the screw part in accordance with a control signal from the fuel control part 47 to convey the fuel at a desired speed and burn it from the fuel input port 3a. It puts in the furnace 3 (fuel injection process). When the fuel injection device 49 receives the predetermined control signal from the fuel control unit 47, the fuel injection device 49 decelerates the rotation of the screw portion. Thereby, the fuel supply into the combustion furnace 3 is reduced (fuel adjustment step), the exhaust gas generated from the combustion furnace 3 is reduced, and the boiler tube 13b is hardly corroded. In addition, when the said control signal is received, the fuel injection apparatus 49 is good also as stopping a screw part.

  According to the boiler 1 and the above-described operation method, the fuel to be introduced into the combustion furnace 3 is adjusted based on the concentration of Cl forming particulate salt having a particle size of 1 μm or less in the exhaust gas. The exhaust gas contacting the boiler tube 13b is adjusted according to the risk of corrosion of the tube 13b. Therefore, corrosion of the boiler tube 13b can be suppressed and the life of the boiler can be extended. Moreover, by suppressing the adhesion of deposits to the boiler tube 13b, there are effects such as suppression of operation troubles due to blockage of the exhaust gas flow path and improvement of heat transfer efficiency of the boiler tube 13b.

  In addition, the exhaust gas contains a large amount of large fly ash particles having a particle size of 1 μm or more, and such large fly ash does not contain much Cl that forms a particulate salt. Conceivable. Therefore, the probe 31 is limited to collecting particles having a particle size of 1 μm or less, and adopts a mechanism that does not collect particles with large fly ash. Therefore, it is possible to exclude large fly ash particles present in large quantities, and the gas analyzer 40 can calculate a highly accurate concentration by analyzing an appropriate amount of sample.

  Further, as described above, most of the Cl forming the salt forms small particles having a particle size of 1 μm or less. Most of the Cl particles forming the particulate salt can be collected. Therefore, it is possible to estimate the ease of corrosion of the boiler tube 15b without inferior to the case where all of the Cl particles forming the particulate salt are collected.

  The present invention is not limited to the embodiment described above. For example, as the fuel input device 49, a device that can appropriately mix waste fuel such as wood chips, tires, RPF, etc., and fuel such as coal that generates little chlorine, and input it to the combustion furnace 3 is adopted. Also good. In this case, when a predetermined control signal instructing adjustment of the fuel input amount is received from the fuel control unit 47, the fuel input device 49 performs an operation to increase the mixing ratio of coal or the like, thereby You may make it reduce chlorine of this.

  Further, in the embodiment, the concentration D of Cl that forms a salt in the exhaust gas and exists as particles having a particle diameter of 1 μm or less is automatically calculated by the gas analyzer 41, but the exhaust gas collected from the probe 31 is Alternatively, the concentration D may be calculated by manual analysis using a method similar to that of the gas analyzer 40, the first analyzer 41, and the second analyzer 42.

It is a figure showing one embodiment of the boiler concerning the present invention. (B) is sectional drawing which expands and shows the probe attached to the gas heat exchange part in the boiler of FIG. 1, (a) is the II-II sectional drawing. It is a block diagram which shows the structure of the gas analyzer used for the boiler of FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Boiler, 3 ... Combustion furnace, 31 ... Monitoring probe (gas sampling means), 40 ... Gas analysis part (concentration acquisition means) 41 ... 1st analysis part (1st measurement means), 42 ... 2nd analysis part ( (Second measuring means), 47 ... fuel control section (fuel adjusting means), 49 ... fuel injection device (fuel adjusting means).

Claims (6)

A combustion furnace for burning the injected fuel;
A cyclone that separates solid particles from the combustion gas generated from the combustion furnace and sends the exhaust gas from which the solid particles have been removed to a subsequent stage;
A heat recovery unit that recovers the heat of the exhaust gas at a subsequent stage of the cyclone;
A concentration acquisition means for acquiring the exhaust gas passing through the heat recovery section from the exhaust gas flow path in the subsequent stage of the cyclone, and acquiring the concentration of Cl forming a particulate salt in the exhaust gas;
A boiler comprising: fuel adjusting means for adjusting fuel to be fed into the combustion furnace based on the concentration acquired by the concentration acquiring means. A combustion furnace for burning the injected fuel;
Concentration acquisition means for acquiring the concentration of Cl forming particulate salt in the exhaust gas generated from the combustion furnace;
Fuel adjustment means for adjusting fuel to be fed into the combustion furnace based on the concentration acquired by the concentration acquisition means,
The concentration acquisition means includes
First measuring means for measuring a concentration of Cl including Cl present in a gaseous state in the exhaust gas and Cl forming the particulate salt;
Second measuring means for measuring the concentration of Cl present in the form of gas in the exhaust gas,
Obtaining the concentration of Cl forming the particulate salt based on the concentration of Cl obtained by the first measuring means and the concentration of Cl obtained by the second measuring means. A featured boiler. The concentration acquisition means includes
Gas collecting means for collecting the exhaust gas from the exhaust gas flow path;
Gas analysis means for analyzing the exhaust gas acquired by the gas acquisition means and acquiring the concentration of Cl forming a particulate salt in the exhaust gas,
The gas sampling means, the boiler according to claim 2 you, characterized in that the flow direction of the exhaust gas in the flow path are collected by sucking the exhaust gas in the opposite direction. A combustion furnace for burning the injected fuel;
A concentration acquisition means for acquiring the exhaust gas from a flow path of the exhaust gas generated from the combustion furnace, and acquiring a concentration of Cl forming a particulate salt in the exhaust gas;
Fuel adjustment means for adjusting fuel to be fed into the combustion furnace based on the concentration acquired by the concentration acquisition means,
The concentration acquisition means includes
Gas collecting means for collecting the exhaust gas from the exhaust gas flow path;
Gas analysis means for analyzing the exhaust gas acquired by the gas acquisition means and acquiring the concentration of Cl forming a particulate salt in the exhaust gas,
The gas sampling means, the boiler, characterized in that the flow direction of the exhaust gas in the flow path is collected by sucking the exhaust gas in the opposite direction. A combustion furnace for burning the injected fuel;
A cyclone that separates solid particles from the combustion gas generated from the combustion furnace and sends the exhaust gas from which the solid particles have been removed to a subsequent stage;
A heat recovery unit that recovers heat of the exhaust gas at a subsequent stage of the cyclone, and a boiler operation method for operating a boiler,
A fuel input step of introducing fuel into the combustion furnace of the boiler,
A concentration acquisition step of acquiring the exhaust gas that passes through the heat recovery section from the exhaust gas flow path in the latter stage of the cyclone, and acquiring the concentration of Cl that forms particulate salt in the exhaust gas;
A boiler operating method comprising: a fuel adjustment step of adjusting fuel to be input in the fuel input step based on the concentration acquired in the concentration acquisition step. A fuel injection process for supplying fuel to the boiler furnace;
A concentration acquisition step of acquiring the exhaust gas from a flow path of the exhaust gas generated from the combustion furnace, and acquiring a concentration of Cl forming a particulate salt in the exhaust gas;
A fuel adjustment step of adjusting the fuel to be input in the fuel injection step based on the concentration acquired in the concentration acquisition step,
The concentration acquisition step includes
A first measurement step for measuring a concentration of Cl including Cl present in a gaseous state in the exhaust gas and Cl forming the particulate salt;
A second measuring step for measuring a concentration of Cl present in a gaseous state in the exhaust gas,
Obtaining the concentration of Cl forming the particulate salt based on the concentration of Cl obtained in the first measurement step and the concentration of Cl obtained in the second measurement step. Characteristic boiler operation method.

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