WO2010084559A1

WO2010084559A1 - Combustion apparatus in which emission of n2o is controlled, and method for controlling emission of n2o

Info

Publication number: WO2010084559A1
Application number: PCT/JP2009/007331
Authority: WO
Inventors: 藤原尚樹
Original assignee: 出光興産株式会社
Priority date: 2009-01-23
Filing date: 2009-12-28
Publication date: 2010-07-29
Also published as: JP5269631B2; US20110271886A1; CN102292596A; JP2010169334A

Abstract

Disclosed is a combustion apparatus in which the emission of N₂O that is generated upon the combustion of a specific nitrogen-containing fuel can be controlled. The combustion apparatus comprises: a decomposition particles supply unit (3) which supplies decomposition particles capable of decomposing N₂O into the apparatus; an N₂O concentration meter (8a) which measures the N₂O concentration in an exhaust gas; and a control unit (10) which compares the measurement value of the N₂O concentration with a predetermined control value and controls the feed rate of the decomposition particles based on the results of the comparison. In the apparatus, the emission of N₂O can be controlled efficiently by supplying a proper amount of the decomposition particles.

Description

N2O emission suppression combustion apparatus and N2O emission suppression method

The present invention relates to a combustion apparatus that generates zinc zinc (N ₂ O) when a predetermined fuel containing a nitrogen content is burned, and in particular, a combustion apparatus that suppresses discharged N ₂ O, and N ₂ O The present invention relates to a method for suppressing emissions.

N ₂ O is a substance that causes global warming. Like CO ₂ , emission is regulated as a reduction target.
N ₂ O is known to be generated when a substance containing nitrogen is burned at a low temperature. In particular, coal, sludge, biomass, etc. containing a large amount of nitrogen are used as fuels, and these fuels are used at low temperatures. In the circulating fluidized bed combustor that burns with NO, the concentration of discharged N ₂ O is high, and its reduction has been a problem.

The present inventors, as a catalytic cracking decomposition particles N 2 _O, by introducing the alumina in circulating fluidized bed combustion furnace, effectively decompose N _{2 O} from the exhaust gas, was successfully removed (Patent Literature 1).

JP-A-6-123406

However, the circulating fluidized bed combustor is a combustor that can use various types of fuel such as coal, heavy oil, petroleum coke, biomass, industrial waste, etc. Correspondingly, the amount of generated N ₂ O emission also varies.
In order to absorb such fluctuations, it was necessary to adjust the amount of decomposed particles supplied to the combustion furnace in accordance with the amount of N ₂ O discharged.

In addition, the circulating fluidized bed combustor fluidizes and burns fuel and a fluid medium (for example, silica sand) and circulates particles (mainly coal ash collected from the combustion product, but unburned fuel). Combustion is performed while repeating a circulation cycle in which the gas is also returned to the combustion furnace. Then, heat is exchanged between the fluid medium and the circulating water to generate steam that serves as a power source for a turbine or the like located on the downstream side.
In such a combustion apparatus, the amount of steam to be generated is controlled to be a constant amount in order to secure a stable power generation amount from the turbine.
For this purpose, the amount of circulating particles circulating in the combustion apparatus is preferably a constant amount, and in particular, in-furnace particles including circulating particles that exist in the combustion furnace in order to ensure an appropriate combustion state. The amount is preferably a constant amount.
Since the decomposed particles circulate in the combustion device as circulating particles, as with a fluid medium such as silica sand, if the decomposed particles are excessively introduced into the combustion device, the amount of circulating particles is lost and stable. The amount of steam cannot be secured.

Also, the decomposition activity of the decomposed particles gradually decreases with time. Therefore, when newly added decomposed particles are added to previously introduced decomposed particles, not only the total amount of circulating particles is increased, but also decomposed particles with weaker decomposition activity are accumulated, and the efficiency of decomposition activity decreases. There was a risk.

The present invention has been proposed to solve the above-described problems, and by supplying an appropriate amount of decomposed particles, the emission of N ₂ O is efficiently suppressed, and in particular, fuel and a predetermined fluid medium In the circulating fluidized bed combustion device that returns the circulating particles collected from the combustion product to the combustion furnace, the amount of particles in the furnace including the circulating particles is determined. while keeping constant, for the purpose of providing for suppressing N _{2 O} emissions combustor and N _{2 O} emissions method emissions N 2 _O.

To achieve the above object, N _{2 O} emissions combustion system of the present invention is an inhibiting combustion device emission of N _{2 O} generated when burning a predetermined fuel containing nitrogen content, N ₂ Supply means for supplying decomposed particles for decomposing O into the apparatus, concentration measuring means for measuring the concentration of N ₂ O contained in the exhaust gas, and comparing the measured N ₂ O concentration with a predetermined control value And a control means for adjusting the supply amount of the decomposed particles based on the comparison result.

N _{2 O} emissions method of the invention, the combustion device N _{2 O} is produced when burning a predetermined fuel containing nitrogen component, and supplies the decomposed decomposing particles N 2 _O, N ₂ O a method of discharging inhibit N _{2 O} emissions, comprising the steps of measuring the N _{2 O} concentration in the exhaust gas, comparing the measured the N _{2 O} concentration was the predetermined control value, the comparison result the basis, there as N _{2 O} emissions method comprising the steps of adjusting the supply amount of the degradation particles.

According to N _{2 O} emissions combustor and N _{2 O} emissions method of the present invention, by supplying a proper amount of degradation particles, can be efficiently suppress the emission of N _{2 O,} in particular, fuel and predetermined fluid medium In the circulating fluidized bed combustion device that returns the circulating particles collected from the combustion product to the combustion furnace, the amount of particles in the furnace including the circulating particles is determined. N ₂ O emission can be suppressed while keeping constant.

It is the schematic which shows the structure of the circulating fluidized-bed combustion apparatus which concerns on one Embodiment of this invention. In circulating fluidized bed combustion apparatus according to an embodiment of the present invention, it is a flowchart illustrating a method of suppressing the emission of N 2 _O. In circulating fluidized bed combustion apparatus according to an embodiment of the present invention, it is a flowchart illustrating a method of suppressing the emission of N _{2 O} in the case provided with no classification device. In circulating fluidized bed combustion apparatus according to an embodiment of the present invention is a flow chart showing the method of suppressing the emission of N _{2 O} in the case provided with no weight loss means.

Hereinafter, a preferred embodiment of an N ₂ O emission suppression combustion apparatus according to the present invention will be described with reference to the drawings.
FIG. 1 is a schematic diagram showing the configuration of the combustion apparatus according to the present embodiment, and FIG. 2 is a flowchart of the N ₂ O emission suppression method in the combustion apparatus according to the present embodiment.

A combustion apparatus to which the present invention is applied is configured to fluidize a fuel and a fluid medium such as silica sand and combust, and to perform combustion while repeating a circulation cycle in which circulating particles collected from the combustion product are returned to the combustion furnace. It is the circulating fluidized bed combustion apparatus to perform.
This circulating fluidized bed combustor is known to emit a large amount of N ₂ O when burned at a low temperature (eg, 600 ° C. to 900 ° C.) using coal or sludge containing a large amount of nitrogen as fuel. However, by measuring the concentration of N ₂ O contained in the exhaust gas and supplying an appropriate amount of decomposed particles that decompose N ₂ O to the combustion furnace, the emission of N ₂ O can be effectively suppressed. Can be done. Hereinafter, the configuration of the circulating fluidized bed combustion apparatus according to the present embodiment will be described with reference to FIG.

As shown in the figure, a circulating fluidized bed combustion apparatus 1 according to this embodiment includes a fuel supply unit 2, a cracked particle supply unit 3, a combustion furnace 4,

pressure gauges

4a and 4b, a cyclone 5, and a heat and exchanger 6a, a outer heat exchanger 6b, and the dust collector 7, a duct 8, and N 2 _O concentration meter 8a, the extraction unit 9, and a like controller 10 for controlling these.
In addition, the dotted line in a figure has shown the connection state of the control part 10, each part and each apparatus, and the flow of a signal.

The fuel supply unit 2 includes a hopper 2a in which fuel and a desulfurizing agent that removes sulfur compounds contained in the fuel are individually supplied to the combustion furnace 4, and the amount of fuel supplied to the combustion furnace 4 and desulfurization. A supply device 2b for individually controlling and supplying the amount of the agent is provided.
In addition to coal, various fuels such as heavy oil, petroleum coke, biomass, waste plastic, waste tire, industrial waste, sludge, sludge can be used as the fuel of the present embodiment.
Moreover, as a desulfurization agent, the substance containing Ca and Mg, such as limestone, quicklime, slaked lime, dolomite, lime cake, concrete sludge, shell, papermaking sludge, can be used, and lime cake is particularly preferable.

The decomposed particle supply unit 3 is provided with a hopper 3 a for storing decomposed particles supplied to the combustion furnace 4 and a supply device 3 b for controlling the amount of decomposed particles supplied to the combustion furnace 4 and supplying the hopper 3 a.
The decomposed particles of the present embodiment include alumina-based particles such as porous alumina, activated alumina, γ-alumina and activated bauxite, silica-based particles such as silica gel, limestone, dolomite, fresh concrete sludge, their sludge cake, and lime. Calcium-based particles such as cake, concrete, activated clay, zeolite, sepiolite, clay mineral-based particles such as fluid catalytic cracking (FCC) catalyst and waste containing them can be used. About 0.001 mm to 5 mm is preferable.
Further, the supply device 3b includes a gravity-type supply device such as a chute, a gate, a rotary feeder, a loss chain feeder, and a lock hopper, a mechanical supply device such as a belt feeder, a screw feeder, a chain feeder, an apron feeder, and a table feeder, Vibrating feeders such as vibratory feeders and shaking feeders, and fluidized feeders such as blow tanks, ejectors and air slides can be used.
The storage of the decomposed particles is not limited to the hopper, and can be stored in a container such as a bunker, a silo, or a bottle.

The combustion furnace 4 pulverizes the fuel supplied from the fuel supply unit 2 or uses it as fuel particles as they are, and the fuel particles and desulfurizing agent, a fluid medium such as silica sand, and the decomposition supplied from the decomposition particle supply unit 3. It is a fluidized bed combustion furnace in which particles are fluidized and burned by air introduced from the lower part of the combustion furnace. The combustion product burned in the combustion furnace 4 is sent to the cyclone 5.
The pressure gauge 4a measures the pressure in the lower part of the combustion furnace 4, and the pressure gauge 4b measures the pressure in the upper part of the combustion furnace 4. Since the amount of particles in the furnace including circulating particles existing in the combustion furnace 4 is a weight that can be calculated from the difference in measured pressure, in this embodiment, the difference in pressure in the combustion furnace 4 is expressed as the amount of particles in the furnace. And is monitored by the control unit 10.

The cyclone 5 is a separation device that generates a swirl of air and separates circulating particles and combustion gas from the combustion product by centrifugal force. The circulating particles are composed of unfueled carbon particles, coal ash, fluidized medium, desulfurizing agent, decomposed particles and the like that are not incinerated, and are returned to the combustion furnace 4 again. On the other hand, the combustion gas is sent to the dust collector 7.
The dust collector 7 removes ash from the combustion gas, and the duct 8 discharges exhaust gas.

The N ₂ O concentration meter 8a measures the N ₂ O concentration in the exhaust gas. This measured value is transmitted to the control unit 10.
As the N ₂ O concentration meter 8a, it is preferable to use a continuous measurement apparatus based on a chemiluminescence method or a non-dispersive infrared absorption method.
The heat exchanger 6a exchanges heat between the circulating water flowing from the outside, the air in the combustion furnace 4 and the particles in the furnace, and the external heat exchanger 6b circulates with the circulating water flowing from the outside. Heat exchange is performed with the particles.
By these, circulating water can be heated and boiled, and a vapor | steam can be generated from the boiler apparatus which is not shown in figure.

The extraction unit 9 is a device that extracts a part of the in-furnace particles including circulating particles from the combustion furnace 4 to reduce the amount of in-furnace particles (a weight reduction unit).
Here, the in-furnace particles refer to particles present in the combustion furnace 4 at a certain point in time. The particles present in the combustion furnace 4 are not circulating particles but also particles that remain as they are. For this reason, the staying particles and the circulating particles of the circulating particles present in the combustion furnace 4 at this time are collectively referred to as in-furnace particles.
The amount of in-furnace particles extracted in the extraction unit 9 is controlled by the control unit 10.
Further, the extraction unit 9 includes a classification device 9a that extracts decomposed particles from the extracted in-furnace particles and returns the extracted decomposed particles to the combustion furnace 4 (extraction / re-supply unit).
As the classification device 9a, it is possible to use a sieving and classification device having a grade capable of classifying decomposed particles, a natural sedimentation type classification device, a dry classification device such as a cyclone or an air separator, or a wet classification device such as a liquid cyclone or a hydroseparator. it can.

Extraction of the decomposed particles can be performed as follows.
For example, when extracting decomposed particles using a sieving classifier, two types of sieves with different meshes are used, the size of one sieve being the minimum particle size of the decomposed particles, and the size of the other sieve being screened. Is the maximum particle size of the decomposed particles, and the extracted particles in the furnace are passed through two types of sieves, so that particles larger than the minimum particle size of the decomposed particles and smaller than the maximum particle size can be easily extracted as decomposed particles. .
Then, all or some of the extracted decomposition particles are returned to the combustion furnace 4 again.
By providing the classifier 9a in this way, the amount of particles in the furnace can be reduced without reducing the amount of decomposed particles, so the proportion of decomposed particles in the particles in the furnace can be increased, and combustion N ₂ O emission can be effectively suppressed by the decomposed particles remaining in the apparatus.
In addition, as a supply apparatus when returning the extracted decomposition | disassembly particle | grains to the combustion furnace 4, the supply apparatus similar to the above-mentioned supply apparatus 3b can be used.

The control unit 10 (control means) is connected to each unit and each device of the combustion device and includes a central processing unit (CPU), for example, a DCS (distributed control device), and a fuel based on a set steam generation amount. Supply control, combustion state monitoring control, and N ₂ O emission concentration are monitored to suppress N ₂ O emission.
The control for suppressing the discharge of N ₂ O will be described in detail below.

Control for suppressing the discharge of N ₂ O is first performed based on the measured value (N ₂ O concentration) from the N ₂ O concentration meter 8a.
The control unit 10 monitors the N ₂ O concentration (for example, 0 to 500 ppm), and compares it with a predetermined management value (for example, 100 ppm) to supply depending on whether or not the N ₂ O concentration exceeds the management value. The apparatus 3b is controlled to increase or decrease the amount of decomposed particles to be supplied.
For example, when the N ₂ O concentration exceeds the control value, the control unit 10 controls the supply device 3b so as to increase the amount of decomposed particles to be supplied. As a result, when the N ₂ O concentration falls within the control value, the amount of decomposed particles to be supplied is reduced.
Thus, by monitoring the N ₂ O concentration and increasing / decreasing the amount of decomposed particles to be supplied, it is possible to effectively suppress the discharge of N ₂ O with an appropriate amount of decomposed particles without excess or deficiency.

Further, the control unit 10 monitors the differential pressure (for example, 1.0 kPa to 2.5 kPa) between the pressure gauge 4a and the pressure gauge 4b as the amount of particles in the furnace. The amount of particles in the furnace is desirably a fixed amount in order to ensure stable combustion and steam generation, and the control unit 10 compares the amount of particles in the furnace with a predetermined limit value, The amount of decomposed particles is increased or decreased depending on whether the amount exceeds this limit value.
Specifically, when the in-furnace particle amount exceeds the upper limit (for example, 2.5 kPa) even though the N ₂ O concentration exceeds a predetermined control value, the following control is performed. .

When the amount of in-furnace particles exceeds the upper limit, the above-described extraction unit 9 is controlled to extract the amount of in-furnace particles corresponding to the amount exceeding the upper limit, and the above-described classification device 9a is controlled. Thus, by extracting the decomposed particles from the extracted in-furnace particles and supplying them again to the combustion furnace 4, the ratio of the decomposed particle amount in the circulating particle amount can be increased.
At this time, the amount of decomposed particles can be increased in parallel with the control of the classifying device 9a or by controlling the supply device 3b alone. In this case, the control of the supply device 3b supplies new decomposed particles having a particularly high decomposition activity ability, so that it is possible to suppress the discharge of N ₂ O while efficiently reducing the amount of particles in the furnace. Such control is particularly effective when the amount of particles in the furnace greatly exceeds the upper limit value and at the same time the N ₂ O concentration greatly exceeds the control value.

Next, the N ₂ O emission suppression method in the circulating fluidized bed combustion apparatus according to the present embodiment will be described with reference to the flowchart of FIG.
The N ₂ O emission suppression method described below is based on a program stored in a predetermined storage unit of the control unit 10, and the central processing unit (CPU) of the control unit 10 is based on an input from each part of the combustion device. This is done by controlling each part.
First, the control unit 10 measures the amount of particles in the combustion furnace 4, for example, the differential pressure between the pressure gauge 4a and the pressure gauge 4b as the amount of particles in the furnace (S10), and further N _{2 in} the exhaust gas. The O concentration is measured (S11). It is assumed that the controller 10 constantly monitors the amount of particles in the furnace and the N ₂ O concentration.
Then, the control unit 10 determines whether or not the amount of particles in the furnace exceeds the upper limit value (S12). If the amount of particles in the furnace exceeds the upper limit value (S12-YES), the extraction unit 9 to extract the particles in the furnace (S13), control the classifier 9a to extract the decomposed particles from the extracted particles in the furnace, and extract all the extracted decomposed particles or a part thereof. Re-supplied to the combustion furnace 4 (S14).
Then, the control unit 10 determines whether or not the in-furnace particle amount has reached the lower limit value (S15), and if the in-furnace particle amount is not the lower limit value (S15-NO), further extracts the in-furnace particle amount. The above processing is repeated (S13).
Until the lower limit is reached, the amount of particles in the furnace is withdrawn, and the decomposed particles are extracted and re-supplied to the combustion furnace 4 to stabilize the combustion state and the amount of steam generated, and to combust By effectively utilizing the decomposed particles remaining in the apparatus, it is possible to efficiently suppress the discharge of N ₂ O.

On the other hand, when the amount of particles in the furnace does not exceed the upper limit (S12-NO), or when the amount of particles in the furnace reaches the lower limit (S15-YES), whether the N ₂ O concentration is within the control value or not. Is determined (S16).
If the N ₂ O concentration is not within the control value (S16—NO), the control unit 10 controls the supply device 3b to increase the supply amount of new decomposed particles having high decomposition activity (S17). Thus, only the extraction and re-supply of degradation particles remaining which weakened decomposition activating capacity, even if N 2 _O concentration that does not fit within the management value, by supplying new degradation particles, N ₂ O Can be reliably suppressed.
Thereafter, while monitoring the amount of particles in the furnace, the above process is repeated until the N ₂ O concentration falls within the control value (S12).
On the other hand, when the N ₂ O concentration is within the control value, the control unit 10 ends the process (S16—YES).
Thereby, the N ₂ O concentration can be kept within the control value by supplying an appropriate amount of the decomposed particles corresponding to the measured N ₂ O concentration without supplying the decomposed particles excessively.
Then, according to the N _{2 O} emissions method of this embodiment, while monitoring the furnace particle amount, it is possible to suppress the emissions of N 2 _O, while ensuring stable combustion and steam generation amount, N ₂ O emission can be efficiently suppressed.

Next, a method for suppressing N ₂ O emission of the circulating fluidized bed combustion apparatus when the classifier 9a is not provided for convenience of the configuration of the combustion apparatus in the above embodiment will be described with reference to the flowchart of FIG.
The circulating fluidized bed combustor is provided with at least a weight reducing means for reducing the amount of particles in the furnace such as the extraction unit 9 for extracting a part of the amount of particles in the furnace from the combustion furnace 4. It is assumed that

First, similarly to the flowchart of FIG. 2, the control unit 10 measures the amount of particles in the combustion furnace 4 (S20), and further measures the N ₂ O concentration in the exhaust gas (S21).
Then, it is determined whether or not the in-furnace particle amount exceeds the upper limit value (S22). If the in-furnace particle amount exceeds the upper limit value (S22-YES), the extraction unit 9 and other weight reductions are performed. The amount of particles in the furnace is reduced by the means (S23). As a result, it is determined whether or not the amount of particles in the furnace has reached the lower limit (S24). If the amount of particles in the furnace is not the lower limit (S24-NO), the amount of circulating particles is further reduced. Is repeated (S23).

On the other hand, when the amount of particles in the furnace does not exceed the upper limit (S22-NO), or when the amount of particles in the furnace reaches the lower limit (S24-YES), whether the N ₂ O concentration is within the control value or not. Is determined (S25).
If the N ₂ O concentration is not within the control value (S25—NO), the control unit 10 controls the supply device 3b to increase the supply amount of the decomposed particles (S26). Thereafter, while monitoring the amount of particles in the furnace, the above process is repeated until the N ₂ O concentration falls within the control value (S22). When the N ₂ O concentration falls within the control value, the process is terminated (S25—YES).
Thereby, the N ₂ O concentration can be kept within the control value by supplying an appropriate amount of the decomposed particles corresponding to the measured N ₂ O concentration without supplying the decomposed particles excessively.
Even by such a N _{2 O} emissions method, while monitoring the furnace particle amount, it is possible to suppress the emissions of N 2 _O, while ensuring stable combustion and steam generation amount, N ₂ O Can be efficiently suppressed.

Furthermore, for the convenience of the configuration of the combustion apparatus, the N ₂ O emission suppression method of the circulating fluidized bed combustion apparatus in the case where not only the extraction section 9 but also the reducing means for reducing the amount of circulating particles is not provided is shown in the flowchart of FIG. Will be described with reference to FIG.
First, the control unit 10 measures the amount of particles in the combustion furnace 4 (S30), and further measures the N ₂ O concentration in the exhaust gas (S31).
Then, it is determined whether or not the amount of particles in the furnace exceeds the upper limit value (S32). If the amount of particles in the furnace exceeds the upper limit value (S32-YES), the supply amount of decomposed particles is increased. Because it is not possible, the process is terminated.
On the other hand, if the amount of particles in the furnace does not exceed the upper limit (S32-NO), it is determined whether the N ₂ O concentration is within the control value (S33).
If the N ₂ O concentration is not within the control value (S33—NO), the controller 10 controls the supply device 3b to increase the supply amount of the decomposed particles (S34). Thereafter, while monitoring the amount of particles in the furnace, the above process is repeated until the N ₂ O concentration falls within the control value (S32). As a result, if the N ₂ O concentration falls within the control value, the process is terminated (S33—YES).
Thereby, the N ₂ O concentration can be kept within the control value by supplying an appropriate amount of the decomposed particles corresponding to the measured N ₂ O concentration without supplying the decomposed particles excessively.
Even when the weight reducing means is not provided in this way, the emission of N ₂ O can be suppressed while monitoring the amount of particles in the furnace, so that stable combustion and generation of steam are ensured, and N ₂ O It is possible to achieve coexistence with emission control.

According to N _{2 O} suppress circulating fluidized bed combustor and the N _{2 O} emissions method emissions according to the present embodiment as described above, the amount circulating particles circulating in the combustion apparatus, in particular, in the combustion furnace While keeping the existing particles in the furnace including circulating particles constant, it is possible to efficiently suppress the discharge of N ₂ O by supplying an appropriate amount of decomposed particles.

Having described preferred embodiments of the N _{2 O} emissions combustor and N _{2 O} emissions method of the present invention, N _{2 O} emissions combustor and N _{2 O} emissions method according to the present invention have been described above performed Needless to say, the present invention is not limited to the embodiment, and various modifications can be made within the scope of the present invention.

For example, in the N ₂ O emission suppression combustion apparatus of the present embodiment, the decomposed particles are supplied alone, but may be supplied by mixing with fuel or a desulfurizing agent.
The place where the decomposed particles are supplied is not limited to the combustion furnace 4, and the combustion gas and the decomposed particles such as the cyclone 5, the heat exchanger 6, the particle circulation equipment such as the loop seal and the full seal, and the pipes connecting them. You may supply from any place which can contact.

Further, the weight reducing means for reducing the amount of the circulating particles is not limited to the extraction unit 9 for extracting a part of the in-furnace particles including the circulating particles. For example, by controlling the supply device 2b, The amount may be adjusted. In addition, it is possible to provide a means for reducing the amount of fuel, such as supplying fuel with a small proportion of unburned ash by screening the fuel, supplying fuel with a small particle size by screening the fuel, and reducing the supply of fluid media such as silica sand. Or you may reduce the amount of circulating particles by combining.

The combustion apparatus of the present invention is not limited to a circulating fluidized bed combustion apparatus, but can be applied to all combustion apparatuses that generate N ₂ O, such as a normal pressure type, a pressurized type, and a bubbling type fluidized bed combustion apparatus.

INDUSTRIAL APPLICABILITY The present invention can be widely used in combustion apparatuses that burn N2O-containing coal or industrial waste as fuel and generate N ₂ O.

Claims

A combustion apparatus that suppresses emission of N 2 O generated when a predetermined fuel containing nitrogen is burned,
Supply means for supplying decomposition particles for decomposing N 2 O into the apparatus;
Concentration measuring means for measuring the concentration of N 2 O contained in the exhaust gas;
Measuring said N 2 O concentration was compared with a predetermined control value, the comparison based on the result, the control means for adjusting the supply amount of degradation particles, N 2 O emissions combustion apparatus, characterized in that it comprises a .
The combustion device is a circulating fluidized bed combustion device that fluidizes and burns the fuel and a predetermined fluidized medium and returns circulating particles collected from the combustion product into the combustion furnace,
A particle amount measuring means for measuring the amount of particles in the furnace including the circulating particles present in the combustion furnace,
The N 2 O emission suppression combustion apparatus according to claim 1, wherein the control means compares the measured amount of particles in the furnace with a predetermined limit value and adjusts the supply amount of the decomposed particles based on the comparison result.
A weight reducing means for reducing the amount of the circulating particles,
3. The N 2 according to claim 2, wherein the control means compares the measured amount of particles in the furnace with a predetermined limit value, and controls the weight reduction means based on the comparison result to reduce the amount of circulating particles. O emission suppression combustion device.
As the weight reduction means, comprising an extraction means for extracting particles in the furnace from the combustion furnace,
The control means compares the measured amount of particles in the furnace with a predetermined limit value, and controls the extraction means based on the comparison result to adjust the amount of extraction of the particles in the furnace. The N 2 O emission suppression combustion apparatus according to 3.
The N 2 O emission suppression according to claim 4, further comprising: extraction means for extracting the decomposed particles from the extracted in-furnace particles; and resupply means for re-supplying the extracted decomposed particles to the combustion furnace. Combustion device.
The N 2 O emission suppression combustion apparatus according to claim 5, wherein the extraction means classifies the extracted in-furnace particles to extract the decomposed particles.
A combustion device N 2 O is produced when burning a predetermined fuel containing nitrogen component, and supplies the decomposed decomposing particles N 2 O, suppress the emission of N 2 O N 2 O emissions method Because
Measuring the N 2 O concentration contained in the exhaust gas;
Measuring said N 2 O concentration was compared with a predetermined control value, based on the comparison result, N 2 O emissions method characterized by comprising the steps of: adjusting a supply amount of the degradation particles.
The combustion device is a circulating fluidized bed combustion device that fluidizes and burns the fuel and a predetermined fluidized medium in a combustion furnace, and returns circulating particles collected from the combustion product to the combustion furnace,
Measuring the amount of particles in the furnace including the circulating particles present in the combustion furnace;
The N 2 O emission suppression method according to claim 7, further comprising: comparing the measured amount of particles in the furnace with a predetermined limit value and adjusting the supply amount of the decomposed particles based on the comparison result.