JP2014149185A - Wastage measuring apparatus and wastage measuring method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately recognize the wastage of a generated gas pipe through which the gas generated by a gasification furnace for gasifying coal circulates.SOLUTION: The wastage measuring apparatus 50 measures the wastage state of a generated gas pipe through which the gas generated by a coal gasification furnace circulates. The wastage measuring apparatus 50 includes: a parallel probe 52A disposed in the generated gas pipe in parallel with the gas flow direction; a tilt probe 52B disposed in the generated gas pipe so as to cross the gas flow direction; an electric resistance value measuring section 56 for measuring the variation of the electric resistance values of the parallel probe 52A and tilt probe 52B; and a wastage state determination section 58 for determining the wastage state of the generated gas pipe on the basis of the measured time variation of the electric resistance values.

Description

  The present invention relates to a thinning measuring apparatus and a thinning measuring method.

Conventionally, the breakdown of pipe thinning exposed to combustion gas in thermal boilers is due to corrosion and wear, but the rate of wear is small, and monitoring does not cause problems by measuring the thinning due to corrosion. It was.
In such a thermal boiler, the actual machine is monitored by corroding the probe with the gas taken out of the thermal boiler and measuring the thickness of the probe. As an example of such a monitoring method, Patent Document 1 discloses that the gas in the furnace is introduced from the furnace wall tube into the reactor, and a constant current is passed through both ends of the metal sample, and the voltage change is measured. Describes a monitoring method for measuring the presence and speed of corrosion in a furnace wall tube.

  Further, a gasification power plant (hereinafter referred to as “IGCC plant”) including a gasification furnace that gasifies a carbon-containing fuel using an oxidant, and a gas turbine that is driven by combustion gas obtained by burning gas generated by the gasification furnace. Is known). In the generated gas piping through which the gas generated in the gasification furnace in this IGCC plant flows, the amount of solid matter (char) such as unburned matter is larger than that in a conventional thermal boiler. For this reason, during the operation of the IGCC plant, as shown in FIG. 11, the thickness reduction of the product gas piping proceeds while periodically repeating the following state I and state II.

・ State I: Char adheres to the pipe surface and the pipe surface is coated, so thinning proceeds only by corrosion with corrosive gas (H ₂ S). ・ State II: Char attached to the pipe surface peels off. The pipe surface is exposed and thinning is progressing due to superposition of wear due to ash and corrosion due to corrosive gas. In state II, the thickness is reduced due to superposition of wear and corrosion. It becomes a problem.

Japanese Patent Laid-Open No. 11-294707

In the monitoring method described in Patent Literature 1 applied to a thermal power boiler, the gas is supplied to the probe after the solid content is removed by a filter, so that the wear component is lost among the thinning elements in the actual machine. . Since the thermal boiler has a small solid content, the influence of the solid content on the wear of the piping can be ignored. Therefore, the monitoring method described in Patent Document 1 uses such a method.
However, as described above, the amount of unburned solids in the IGCC plant is larger than that in a conventional thermal power boiler. For this reason, when the monitoring method described in Patent Document 1 is applied to an IGCC plant, the thinning of the generated gas pipe is underestimated by removing the solid content with a filter, and problems such as leakage into the generated gas pipe May occur. Moreover, as shown in FIG. 11, the progress mode of the thinning in the IGCC plant is different from that of the thermal power boiler.

  The present invention has been made in view of such circumstances, and a thinning measuring apparatus and a thinning measuring method capable of accurately grasping a thinning of a generated gas pipe through which a gas generated in a gasification furnace flows. The purpose is to provide.

  In order to solve the above problems, the thinning measuring apparatus and thinning measuring method of the present invention employ the following means.

  The thinning measurement apparatus according to the first aspect of the present invention is a thinning measurement apparatus that measures a thinning state of a product gas pipe through which a gas generated by a gasification furnace that gasifies a carbon-containing fuel flows, A first member disposed in the product gas pipe in parallel with the gas flow direction; a second member disposed in the product gas pipe so as to intersect the gas flow direction; the first member; Based on the electrical resistance value measuring means for measuring the change in the electrical resistance value of the second member and the temporal change in the electrical resistance value measured by the electrical resistance value measuring means, the thinning state of the product gas pipe is determined. Determining means.

  The thinning measuring apparatus according to this configuration measures the thinning state of the generated gas pipe through which the gas generated by the gasification furnace flows.

In this configuration, the first member is disposed in the product gas pipe in parallel with the gas flow direction. Since the first member is arranged in the product gas pipe, the product gas pipe is affected by the gas flowing through the product gas pipe, and is affected by the abrasion caused by the ash discharged from the gasification furnace and the corrosion caused by the corrosive gas. It is thinned as well. More specifically, since the first member is arranged in parallel with the gas flow direction, the char discharged from the gasification furnace adheres and coats the surface. When char is attached, the metal is not reduced due to wear, but only due to corrosion. On the other hand, when the char peels off, thinning occurs due to wear and corrosion. This phenomenon is the same as that occurring on the surface of the product gas piping.
Further, the second member is arranged in the generated gas pipe so as to intersect the gas flow direction. Since the second member is arranged so as to intersect with the gas flow direction, the resistance to the flow is large, the char is hardly attached, and the wall thickness is always reduced due to wear and corrosion. That is, the thinning of the second member is stronger than that of the first member.

And the change of the electrical resistance value of a 1st member and a 2nd member is measured by an electrical resistance value measurement means. Since the electrical resistance value increases as the thickness of the first member and the second member decreases and the thickness decreases, the thickness reduction state of the first member and the second member is measured by measuring the electrical resistance value. It becomes.
Furthermore, the thinning state of the product gas pipe is determined by the determination means based on the time change of the measured electric resistance value. That is, the time change of the electrical resistance value indicates the thinning rate, and the change in time of the thinned state of the product gas pipe is determined by the determination means.

  Thus, this structure arrange | positions a 1st member and a 2nd member directly in product gas piping, and since the thickness reduction state of a 1st member and a 2nd member is determined by the time change of an electrical resistance value, product gas piping It is possible to accurately grasp the thinning.

  In the first aspect, the determination unit is configured to reduce the thickness of the product gas pipe based on the thickness reduction rate based on the electrical resistance value of the first member and the thickness reduction rate based on the electrical resistance value of the second member. Is preferably calculated to determine the thickness reduction state of the product gas pipe.

In said 1st aspect, the thickness reduction rate according to the thickness reduction only by corrosion can be calculated | required from the electrical resistance value of a 1st member. On the other hand, from the electric resistance value of the second member, it is possible to obtain the thinning rate according to the thinning due to wear and corrosion, that is, the thinning rate when the thinning is most advanced.
According to this configuration, the thinning amount is calculated using the two thinning speeds by simulating the progress of the thinning of the product gas pipe, so that the thinning of the product gas pipe can be grasped more accurately.

  The thinning measurement method according to the second aspect of the present invention is provided in a production gas pipe through which a gas produced by a gasification furnace for gasifying a carbon-containing fuel flows, and measures a thinning state of the production gas pipe. A thinning measurement method, comprising: a first member disposed in the product gas pipe parallel to the gas flow direction; and a second member disposed in the product gas pipe so as to intersect the gas flow direction. A first step of measuring a change in the electrical resistance value, and a second step of determining a thinning state of the product gas pipe based on a temporal change in the measured electrical resistance value.

  ADVANTAGE OF THE INVENTION According to this invention, it has the outstanding effect that the thinning of the production | generation gas piping through which the gas produced | generated by the gasifier distribute | circulates can be grasped | ascertained correctly.

It is a block diagram of the IGCC plant which concerns on embodiment of this invention. It is a block diagram of the parallel probe of the thinning measuring apparatus which concerns on embodiment of this invention. It is detail drawing of the parallel probe which concerns on embodiment of this invention. It is the graph which showed the relationship between the electrical resistance value of the probe which concerns on embodiment of this invention, and wall thickness. It is the graph which showed the relationship between the thinning rate of the probe which concerns on embodiment of this invention, and the thinning rate of product gas piping. It is the schematic diagram which showed the thinning state which can be simulated with the probe which concerns on embodiment of this invention. It is a block diagram of the inclination probe of the thinning measuring apparatus which concerns on embodiment of this invention. It is the graph which showed the relationship between the collision angle of the probe which concerns on embodiment of this invention, and gas, and a thinning speed. It is the functional block diagram which showed the electrical structure of the thinning measuring apparatus which concerns on embodiment of this invention. It is the graph which showed the change of the thinning speed of the probe concerning the embodiment of the present invention. It is the graph which showed the change of the thinning rate in the production gas piping of IGCC.

  Hereinafter, an embodiment of a thinning measuring apparatus and a thinning measuring method according to the present invention will be described with reference to the drawings.

  In the present embodiment, the present invention is a coal gasification furnace that gasifies a carbon-containing fuel using an oxidant, a gas turbine that is driven by a combustion gas obtained by burning a gas generated by the coal gasification furnace, and a steam turbine. The case where it applies to a coal gasification combined cycle power plant (henceforth "IGCC plant") provided with this will be described. Note that the oxidizer is air and oxygen as an example, and the carbon-containing fuel is coal as an example.

FIG. 1 is a diagram illustrating an overall schematic configuration of an IGCC plant 1 according to the present embodiment.
As shown in FIG. 1, the IGCC plant 1 according to this embodiment mainly includes a coal gasification furnace 3, a gas turbine facility 5, a steam turbine facility 7, and an exhaust heat recovery boiler (hereinafter referred to as “HRSG”). 30.

A coal supply facility 10 that supplies pulverized coal to the coal gasifier 3 is provided on the upstream side of the coal gasifier 3. The coal supply facility 10 includes a pulverizer (not shown) that pulverizes raw coal into pulverized coal of several μm to several hundred μm. It is to be stored in.
The pulverized coal stored in each hopper 11 is conveyed to the coal gasification furnace 3 together with nitrogen gas (N ₂ ) supplied from an air separation facility (hereinafter referred to as “ASU”) 15 at a constant flow rate. The ASU 15 is a device that separates nitrogen gas and oxygen gas from the air and supplies them to the coal gasification furnace 3.

The coal gasification furnace 3 is connected to the coal gasification unit 3a formed so that gas flows from below to above, and to the downstream side of the coal gasification unit 3a, so that gas flows from above to below. The heat exchange part 3b formed is provided.
The coal gasification unit 3a is provided with a combustor 13 and a reductor 14 from below. The combustor 13 burns a part of the pulverized coal and char, and the remainder is a part that is released as volatile matter (CO, H ₂ , lower hydrocarbon) by thermal decomposition. The combustor 13 employs a spouted bed, but may be a fluidized bed type or a fixed bed type.

The combustor 13 and the reductor 14 are respectively provided with a combustor burner 13a and a reductor burner 14a, and pulverized coal is supplied from the coal supply facility 10 to the combustor burner 13a and the reductor burner 14a.
The combustor burner 13a is supplied with oxygen gas separated by the ASU 15 together with the air from the air booster 17 as an oxidant. In this way, the combustor burner 13a is supplied with air whose oxygen concentration is adjusted.

In the reductor 14, the pulverized coal is gasified by the high-temperature combustion gas from the combustor 13. Thus, the coal gasification gas as a gaseous fuel ₂ such as CO and H from coal is produced. The coal gasification reaction is an endothermic reaction in which pulverized coal and char carbon react with CO ₂ and H ₂ O in a high-temperature gas to generate CO and H ₂ .

  The coal gasification furnace 3 generates coal gasification gas by reacting supply air supplied from the air compressor 5c with coal. Specifically, a plurality of heat exchangers (not shown) are installed in the heat exchange section 3b of the coal gasification furnace 3, so that steam is generated by obtaining sensible heat from the gas guided from the reductor 14. It has become. The steam generated in the heat exchanger is mainly used as driving steam for the steam turbine 7b. The gas that has passed through the heat exchanging unit 3 b flows through the product gas pipe 23 and is guided to the dust removal equipment 20. The dust removal equipment 20 includes a porous filter, and captures and collects the char mixed in the gas by passing through the porous filter. The captured char is deposited on the porous filter to form a char layer. In the char layer, the Na and K components contained in the gas are condensed, and as a result, the Na and K components are also removed in the dust removal equipment 20.

  The char collected in this way is returned to the char burner 21 of the coal gasification furnace 3 and recycled. The Na and K components returned to the char burner 21 together with the char are discharged from below the coal gasification unit 3a together with the finally melted ash of pulverized coal. The molten and discharged ash is quenched with water and crushed into glassy slag.

  The gas that has passed through the dust removal equipment 20 is purified by the gas purification equipment 22 and sent to the combustor 5a of the gas turbine equipment 5 as fuel gas.

  The gas turbine equipment 5 includes a combustor 5a in which gasified fuel is combusted, a gas turbine 5b driven by the combustion gas, and an air compressor 5c that sends high-pressure air to the combustor 5a. The gas turbine 5b and the air compressor 5c are connected by the same rotating shaft 5d. The air compressed in the air compressor 5c is extracted and guided to the air booster 17 separately from the combustor 5a.

The combustion exhaust gas that has passed through the gas turbine 5b is guided to the HRSG 30.
The steam turbine 7b of the steam turbine equipment 7 is connected to the same rotating shaft 5d as the gas turbine equipment 5, and is a so-called single-shaft combined system. High-pressure steam is supplied to the steam turbine 7b from the coal gasification furnace 3 and the HRSG 30. In addition, not only a uniaxial combined system but a biaxial combined system may be used.
A generator 9 that outputs electricity from a rotating shaft 5 d that is driven by the gas turbine 5 b and the steam turbine 7 b is provided on the opposite side of the gas turbine equipment 5 with the steam turbine equipment 7 interposed therebetween. The arrangement position of the generator 9 is not limited to this position, and may be any position as long as an electrical output can be obtained from the rotating shaft 5d.
The HRSG 30 generates steam from the combustion exhaust gas from the gas turbine 5b and releases the combustion exhaust gas from the chimney 31 to the atmosphere.

Next, operation | movement of the IGCC plant 1 to which the coal gasification furnace 3 of the said structure is applied is demonstrated.
The raw coal is pulverized by a pulverizer (not shown) and then guided to the hopper 11 and stored. The pulverized coal stored in the hopper 11 is supplied to the reductor burner 14a and the combustor burner 13a together with the nitrogen gas separated in the ASU 15. Further, the char collected in the dust removal equipment 20 is supplied to the char burner 21.

As the combustion gas of the combustor burner 13a, the oxygen gas extracted from the air compressor 5c of the gas turbine equipment 5 and further pressurized by the air booster 17 is added with the oxygen gas separated in the air separator 15. used. In the combustor 13, the pulverized coal and char are partially burned by the combustion air, and the remainder is thermally decomposed into volatile components (CO, H ₂ , lower hydrocarbons).
In the reductor 14, the pulverized coal supplied from the reductor burner 14a and the char released from the volatile matter in the combustor 13 are gasified by the high-temperature gas rising from the combustor 13, and combustible gases such as CO and H ₂ are generated. The

The gas that has passed through the reductor 14 gives its sensible heat to each heat exchanger while passing through the heat exchange section 3b of the coal gasification furnace 3, thereby generating steam. The steam generated in the heat exchange unit 3b is mainly used for driving the steam turbine 7b.
The gas that has passed through the heat exchanging section 3b flows through the product gas pipe 23 and is guided to the dust removal equipment 20, and char is collected. The Na and K components in the gas are condensed here and taken into the char. The recovered char containing Na and K is returned to the coal gasifier 3.

  The gas that has passed through the dust removal equipment 20 is guided to the combustor 5a of the gas turbine equipment 5 and burned together with the compressed air supplied from the air compressor 5c. The gas turbine 5b is rotated by the combustion gas, and the rotating shaft 5d is driven.

The combustion exhaust gas that has passed through the gas turbine 5b is guided to the HRSG 30, and steam is generated by utilizing the sensible heat of this combustion exhaust gas. The steam generated in the HRSG 30 is mainly used for driving the steam turbine 7b.
The steam turbine 7 b is rotated by the steam from the coal gasification furnace 3 and the steam from the HRSG 30, and drives the same rotating shaft 5 d as the gas turbine equipment 5. The rotational force of the rotating shaft 5d is converted into an electrical output by the generator 9.

Here, since the char and the corrosive gas circulate in the generated gas pipe 23 together with the gas (coal gasified gas) generated in the coal gasification furnace 3 as described above, wear due to char and corrosion due to corrosive gas. For thinning.
For this reason, the IGCC plant 1 which concerns on this embodiment is provided with the thinning measuring apparatus 50 (refer also FIG. 9) which measures the thinning state of the product gas piping 23. FIG.

  As shown in FIGS. 2 and 7, the thinning measuring device 50 includes a parallel probe 52A and an inclined probe 52B.

  The parallel probe 52A shown in FIG. 2 is arranged in the product gas pipe 23 in parallel with the gas flow direction. The parallel probe 52A is a flat plate as shown in FIG. 3 as an example, and is attached to the flange 53 of the product gas pipe 23 by, for example, bolts and nuts. A terminal 54 is attached to the parallel probe 52A so that the electric resistance value can be measured.

  Since the parallel probe 52A is disposed in the product gas pipe 23, the parallel probe 52A is affected by the gas flowing through the product gas pipe 23, and is affected by wear caused by ash discharged from the coal gasification furnace 3 and corrosion caused by corrosive gas. As with the product gas pipe 23, the thickness is reduced. More specifically, since the parallel probe 52A is disposed in parallel with the gas flow direction, the char discharged from the coal gasification furnace 3 adheres and coats the surface. When char is attached, the metal is not reduced due to wear, but only due to corrosion. On the other hand, when the char peels off, thinning occurs due to wear and corrosion. This phenomenon is the same as that occurring on the surface of the product gas pipe 23.

このため、詳細を後述するように、減肉測定装置５０は、平行プローブ５２Ａが備える平行プローブ５２Ａの電気抵抗値を測定することによって、減肉速度を算出する。
なお、平行プローブ５２Ａの電気抵抗率は既知であるので、図４のように電気抵抗値と肉厚の関係が求められる。 As the thickness of the parallel probe 52A decreases due to wear or corrosion, that is, as the thickness of the parallel probe 52A decreases, the electrical resistance value increases as shown in the equation (1). In equation (1), R is the electrical resistance value, ρ is the electrical resistivity of the parallel probe 52A, L is the length of the parallel probe 52A, d is the thickness of the parallel probe 52A, and w is the width of the parallel probe 52A.

For this reason, as will be described in detail later, the thinning measuring apparatus 50 calculates the thinning speed by measuring the electric resistance value of the parallel probe 52A included in the parallel probe 52A.
Since the electrical resistivity of the parallel probe 52A is known, the relationship between the electrical resistance value and the wall thickness is required as shown in FIG.

  Further, the material of the parallel probe 52A is preferably a material (for example, zinc) that is more sensitive to corrosion than the product gas pipe 23, that is, has a high corrosion rate. For this reason, as shown in FIG. 5, the relationship between the thinning rate of the parallel probe 52A and the thinning rate of the product gas pipe 23 is obtained in advance by experiments or the like.

Further, the parallel probe 52A can be applied to uniform thinning of the entire surface as shown in FIG. 6A or thinning of the entire surface with slight surface roughness as shown in FIG. 6B. is there. However, the parallel probe 52A is not suitable for uneven thinning which is locally thinned as shown in FIG. This is because the measured electrical resistance value of the parallel probe 52A appears as an average thickness, and it is difficult to clearly distinguish between local thinning and overall thinning.
For this reason, the product gas piping 23 to be simulated needs to be resistant to local thinning as shown in FIG.

The inclined probe 52B shown in FIG. 7 is disposed in the generated gas pipe 23 so as to intersect the gas flow direction. The inclined probe 52B is a flat plate as an example.
The inclined probe 52B is preferably formed of the same material as the parallel probe 52A. In addition, it is preferable that the inclined probe 52B and the parallel probe 52A are arranged close to each other in the product gas pipe 23 so that the measurement conditions are the same.

  Since the inclined probe 52B is arranged so as to intersect with the gas flow direction, the resistance to the flow is large, and the adhesion of the char hardly occurs, and therefore the thinning due to wear and corrosion always occurs. In other words, the inclined probe 52B appears to be thinner than the first member.

Here, FIG. 8 is a graph showing the relationship between the collision angle θ between the probe and the gas and the thinning speed. The collision angle θ = 0 ° in FIG. 8 is the same as the arrangement angle of the parallel probe 52A when the probe is arranged in parallel with the gas flow direction. Then, until the collision angle θ reaches a predetermined value from 0 °, the thinning speed increases as the collision angle increases, and when the collision angle θ exceeds the predetermined value, the thinning speed becomes slower than before.
The arrangement angle of the inclined probe 52B is preferably the predetermined value at which the thinning speed is the fastest. Further, the thinning speed of the parallel probe 52A and the thinning speed of the inclined probe 52B have a relationship of k (k <1): 1.

FIG. 9 is a functional block diagram showing an electrical configuration of the thinning measuring apparatus 50.
The thinning measurement device 50 includes an electrical resistance value measurement unit 56, a thinning state determination unit 58, and a notification unit 60. The thinning measuring apparatus 50 includes, for example, a CPU (Central Processing Unit), a RAM (Random Access Memory), a computer-readable recording medium, and the like. A series of processes for realizing the various functions of the electrical resistance value measurement unit 56 and the thinning state determination unit 58 are recorded on a recording medium or the like in the form of a program as an example, and the CPU stores the program in the RAM. Various functions are realized by reading out the information and executing information processing / calculation processing.

  The electric resistance value measurement unit 56 measures the electric resistance values of the parallel probe 52A and the tilt probe 52B. As described above, the electrical resistance value increases as the thickness of the parallel probe 52A and the inclined probe 52B decreases, that is, as the thickness of the parallel probe 52A and the inclined probe 52B decreases.

The thinning state determination unit 58 determines the thinning state of the product gas pipe 23 based on the temporal change in the electrical resistance value measured by the electrical resistance value measurement unit 56.
In order to determine the thinning state of the product gas pipe 23, the thinning state determination unit 58 obtains the thickness of the parallel probe 52A and the inclined probe 52B. For this purpose, the thinning measuring apparatus 50 stores in advance electrical resistance value-thickness data indicating the relationship between the electrical resistance value of the parallel probe 52A and the thickness (see FIG. 4). The thinning state determination unit 58 obtains a thickness corresponding to the electric resistance value of the parallel probe 52A based on the electric resistance value-thickness data.

Further, the thinning state determination unit 58 calculates the thinning rate from the change with time (time differential value) of the thickness obtained based on the electrical resistance value, and calculates the thinning amount from the thinning rate. Note that the thinning state determination unit 58 calculates the thinning rate based on the relationship between the thinning rate of the probe and the thinning rate of the product gas piping (see FIG. 5).
More specifically, the thinning state determination unit 58 performs the thinning of the product gas pipe 23 based on the thinning speed based on the electric resistance value of the parallel probe 52A and the thinning speed based on the electric resistance value of the inclined probe 52B. Calculate the amount.

As described above, from the electrical resistance value of the parallel probe 52A, it is possible to obtain the thinning rate corresponding to the thinning only due to corrosion (the thinning rate V _e in the state I in FIG. 10). However, since the thinning speed when the thinning progresses most (the fastest thinning speed V _c in the state II in FIG. 10) is an instantaneous value, it is difficult to obtain from the parallel probe 52A.

On the other hand, as shown in FIG. 10, the thinning speed of the inclined probe 52B is constant. This is because the tilted probe 52B does not adhere to and peel off char and is always thinned by wear and corrosion. For this reason, from the electric resistance value of the inclined probe 52B, the thinning speed when the thinning progresses most, which cannot be accurately obtained by the parallel probe 52A, can be accurately obtained.
In addition, since the relationship between the thinning speed of the parallel probe 52A and the thinning speed of the inclined probe 52B is k (k <1): 1, the thinning speed obtained from the electrical resistance value of the inclined probe 52B is is multiplied by k are thinning speed V _c by.

なお、ｔｘは石炭ガス化炉３の運転時間、ｔｃは状態Ｉと状態ＩＩと繰り返す周期、ｔｏは状態ＩＩの周期、ｍは安全率である。なお、ｍは実機でのスケール剥離が平行プローブ５２Ａでの何倍となるかを参照して決定される。 The thinning state determination unit 58 uses the two thinning speeds V _e and V _c to calculate the thinning amount by simulating the progress of the thinning of the product gas pipe 23, Can grasp meat more accurately.
The following formula (2) is a calculation formula for calculating the thinning amount.

In addition, tx is the operation time of the coal gasification furnace 3, tc is the cycle of repeating the states I and II, to is the cycle of the state II, and m is the safety factor. Note that m is determined by referring to how many times the scale separation in the actual machine is larger than that in the parallel probe 52A.

Since the thinning speed V _e is accompanied by a time change, the average value in the state I is used as an example of the thinning speed V _e .
Condition II of this embodiment, the timing at which the thinning rate becomes half the speed of the thinning rate V _c is the end timing of the state II (start timing of the state I). However, the present invention is not limited to this, and the end timing of state II is determined in accordance with the actual machine, for example, the timing at which the thinning speed becomes a quarter of the thinning speed Vc is the end timing of state II. May be.

Then, the thinning state determination unit 58 determines that the thinning of the product gas pipe 23 is progressing so as to require inspection or replacement when the calculated thinning amount is equal to or greater than a predetermined value. The notification unit 60 is notified.
The notification unit 60 according to the present embodiment is a monitor that displays the thinning state of the generated gas pipe 23 as an image, but is not limited to this, and a printing apparatus that notifies by printing on a speaker or paper that is notified by voice. It may be.

As described above, the thinning measuring device 50 according to the present embodiment measures the thinning state of the generated gas pipe 23 through which the gas generated by the coal gasification furnace 3 flows. The thinning measuring device 50 includes a parallel probe 52A arranged in the product gas pipe 23 in parallel with the gas flow direction, and an inclined probe 52B arranged in the product gas pipe 23 so as to intersect the gas flow direction. The electrical resistance value measurement unit 56 that measures changes in the electrical resistance values of the parallel probe 52A and the inclined probe 52B, and the reduction that determines the thinning state of the generated gas pipe 23 based on the temporal change in the measured electrical resistance value. A meat state determination unit 58.
Accordingly, the thinning measuring apparatus 50 according to the present embodiment directly arranges the parallel probe 52A and the inclined probe 52B in the product gas pipe 23, and the thinning state of the parallel probe 52A and the inclined probe 52B is represented by the time variation of the electrical resistance value. Since it determines, the thinning of the production gas piping 23 can be grasped correctly.

  As mentioned above, although this invention was demonstrated using the said embodiment, the technical scope of this invention is not limited to the range as described in the said embodiment. Various changes or improvements can be added to the above-described embodiment without departing from the gist of the invention, and embodiments to which the changes or improvements are added are also included in the technical scope of the present invention.

DESCRIPTION OF SYMBOLS 1 IGCC plant 3 Coal gasifier 23 Generated gas piping 50 Thinning measuring device 52A Parallel probe 52B Inclined probe 56 Electrical resistance value measurement part 58 Thinning state determination part

Claims (3)

A thinning measuring device for measuring a thinning state of a product gas pipe through which a gas generated by a gasification furnace for gasifying a carbon-containing fuel flows,
A first member disposed in the product gas pipe in parallel with the gas flow direction;
A second member arranged in the product gas pipe so as to intersect the gas flow direction;
Electrical resistance value measuring means for measuring changes in electrical resistance values of the first member and the second member;
A determination unit that determines a thinning state of the generated gas pipe based on a temporal change in the electric resistance value measured by the electric resistance value measuring unit;
A thinning measuring device comprising:   The determination means calculates the thinning amount of the generated gas pipe based on the thinning speed based on the electric resistance value of the first member and the thinning speed based on the electric resistance value of the second member to generate the generation The thinning measuring apparatus according to claim 1, wherein the thinning state of the gas pipe is determined. A thinning measurement method for measuring a thinning state of a product gas pipe provided in a product gas pipe through which a gas generated by a gasification furnace for gasifying a carbon-containing fuel flows,
Changes in electrical resistance values of the first member arranged in the product gas pipe parallel to the gas flow direction and the second member arranged in the product gas pipe so as to intersect the gas flow direction are measured. A first step of
A second step of determining a thinning state of the product gas pipe based on a time change of the measured electric resistance value;
A method for measuring thinning.

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