JP2011185460A - Coal/water paste manufacturing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a coal/water paste manufacturing device capable of stably manufacturing CSP in a state that viscosity hardly changes even when a viscometer, or the viscometer and a moisture meter are in bad condition. <P>SOLUTION: In this coal/water paste manufacturing device 1 in which the viscosity of coal/water paste at an outlet of a kneader and a moisture content of coarse coal are measured online, and a control device 13 adjusts a water injection amount to the kneader 3 on the basis of the measured values to control the viscosity of the coal/water paste within a set range, an ammeter 27 for measuring motor electric current of the kneader 3 online is disposed, and the control device 13 determines the presence or absence of abnormality in the viscosity measurement value of the coal/water paste in adjusting the water injection amount to the kneader 3, so that the viscosity measurement value is used when it is determined that the viscosity measurement value is not abnormal, and a viscosity value is calculated from the motor electric current measurement value of the kneader 3 to use the calculated viscosity value for the viscosity measurement value when it is determined that the viscosity measurement value is abnormal. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a coal / water paste production apparatus for producing coal / water paste which is fuel for a pressurized fluidized bed boiler.

  In a power generation system using a pressurized fluidized bed boiler, a combined power generation system that generates steam by generating heat by combustion heat generated by burning coal and driving a steam turbine and driving a gas turbine with combustion gas is adopted. Since the pressurized fluidized bed boiler fluidizes the fluid medium in the boiler and combusts the supplied coal while fluidizing it, the combustion temperature is as low as about 870 ° C. As a result, the generation of nitrogen oxides is suppressed, and further, the use of limestone as the fluid medium has the advantage that in-furnace desulfurization is simultaneously performed.

  As a fuel for the pressurized fluidized bed boiler, a coal / water paste (CWP: Coal Water Paste, hereinafter sometimes referred to as CWP) made of a mixture of coal, limestone, and water is used. CWP is produced by kneading a pulverized coal slurry made of a mixture of pulverized coal and water, coarse pulverized coal having a particle diameter of 2 mm or less, limestone, and water for viscosity adjustment with a kneader. Although the properties of CWP vary depending on the coal type, the viscosity of standard CWP is 4 to 10 Pa · s, and the water content is about 24 to 25% by weight. CWP easily separates coal and water if the viscosity is low, and conversely if the viscosity is too high, it will be easily blocked in the piping, so the CWP viscosity at the kneader outlet and the water content of the coarse coal are measured online. The amount of water injected into the kneader is adjusted using these measured values, and the viscosity of the CWP is controlled to be within the set range. The produced CWP is supplied to the furnace through a CWP pump.

  The viscosity of CWP at the exit of the kneader is performed as follows using a viscometer. The viscometer is provided at the kneader outlet and includes a CWP introduction guide plate, a viscosity measurement container, a pin-type rotor, a torque meter, a CWP discharge gate, and a washing nozzle. Part of the CWP discharged from the kneader outlet is guided to the viscosity measuring container via the CWP introduction guide plate, the pin type rotor is rotated, and the stirring torque at this time is measured with a torque meter. Since there is a correlation between the stirring torque and the CWP viscosity, the CWP viscosity can be easily obtained by acquiring the relationship between the stirring torque and the CWP viscosity in advance. When the viscosity measurement is completed, the CWP discharge gate is opened and CWP is discharged, and water is injected into the viscosity measurement container and the like to perform cleaning. These operations are automatically performed at predetermined intervals via the control device (see, for example, Patent Document 1).

  The moisture content of the coarse coal is measured by a non-contact type moisture meter installed in a coal feeder that supplies the coarse coal to the kneader. As the moisture meter, an optical moisture meter is generally used.

Japanese Patent No. 4076004

  In conventional CWP manufacturing, the viscosity of CWP at the outlet of the kneader and the moisture content of the pulverized coal are measured online, and the controller adjusts the amount of water injected into the kneader using these measured values to set the viscosity of the CWP. Therefore, the viscometer that measures the viscosity of the CWP at the kneader outlet and / or the moisture meter that measures the moisture content of the coarse coal is not good, and abnormal measured values are sent to the controller. As a result, the amount of water injected into the kneader greatly fluctuates, and as a result, the viscosity of the CWP at the kneader outlet also falls outside the set range. In fact, such an event has also occurred. The viscometer has a built-in cleaning nozzle to prevent troubles caused by CWP solidification, accumulation, etc., but it completely prevents CWP accumulation on unexpected parts, troubles in operating parts due to long-term operation, etc. It cannot be prevented. For the moisture meter, for example, if the light receiving surface is dirty, the amount of moisture is mistaken. In the conventional CWP manufacturing apparatus, no countermeasure is taken when the viscometer and / or moisture meter malfunctions.

  The purpose of the present invention is to measure the viscosity of the coal / water paste at the outlet of the kneader and the moisture content of the coarse coal, adjust the amount of water injected into the kneader using these measured values, and set the viscosity of the CWP. To provide a coal / water paste production apparatus capable of stably producing CWP with almost no change in viscosity even when the viscometer or the viscometer and moisture meter malfunction in the CWP production apparatus controlled within the range. .

  The present invention according to claim 1 is a kneader in which pulverized coal slurry, coarse coal, limestone and water are kneaded to form coal / water paste, a viscometer for measuring the viscosity of coal / water paste at the kneader outlet, and coarse coal A moisture meter for measuring the moisture content of the kneader, a kneader water injection device for supplying water for viscosity adjustment to the kneader, and a controller for controlling the kneader water injection device, the viscosity of the coal / water paste at the kneader outlet The water content of the pulverized coal is measured online, and the control device adjusts the amount of water injected into the kneader using these measured values, and controls the viscosity of the coal / water paste within a set range. In the paste manufacturing apparatus, an ammeter that measures the motor current of the kneading machine on-line is mounted, and the control apparatus determines whether there is an abnormality in the measured viscosity value of the coal / water paste when adjusting the amount of water injected into the kneading machine. Determine the viscosity If it is determined that the measured value is not abnormal, the viscosity measured value is used, and if it is determined that the measured viscosity value is abnormal, the viscosity value is calculated from the motor current measured value of the kneader and is calculated instead of the viscosity measured value. It is a coal / water paste manufacturing apparatus characterized by using the viscosity value.

  According to a second aspect of the present invention, in the coal / water paste manufacturing apparatus according to the first aspect, when the control device further adjusts the amount of water to be added to the kneader, the water content measurement value of the coarse coal is abnormal. When the water content measurement value is determined to be abnormal, the water content measurement value is used. When the water content measurement value is determined to be abnormal, the water content is replaced with the water content measurement value. It is characterized by using a normal water content measurement value that is closest to the measurement value.

  According to a third aspect of the present invention, there is provided the coal / water paste manufacturing apparatus according to the second aspect, wherein the control device includes a storage means for storing a moisture content measurement value, and determines whether or not there is an abnormality. Based on the value, a plurality of recent water content measurement values in the past are read from the storage means, an average value is obtained, and a difference between the average value and each water content measurement value used for the average value calculation is calculated. If the difference is less than or equal to a predetermined value, the average value is taken as the most recent normal water content measurement value, and if there is a water content measurement value with the difference exceeding the predetermined value, the average value is again excluded except for the water content measurement value. And calculate the most recent normal moisture content measurement value according to the above procedure, determine the difference between the most recent normal moisture content measurement value and the moisture content measurement value to determine whether there is an abnormality, and the difference exceeds a predetermined value And determining that the measured water content is abnormal.

  The present invention according to claim 4 is the coal / water paste manufacturing apparatus according to any one of claims 1 to 3, further comprising an alarm means, wherein the control device is a viscosity measurement value of the coal / water paste, Alternatively, when it is determined that the viscosity measurement value of the coal / water paste and the moisture content measurement value of the pulverized coal are abnormal, an alarm is issued through an alarm means.

  The coal / water paste manufacturing apparatus according to the present invention determines whether or not the viscosity measurement value of the coal / water paste at the outlet of the kneader is abnormal when the controller adjusts the amount of water injected into the kneader. If it is determined that the measured viscosity value is abnormal, the viscosity value is calculated from the measured motor current of the kneader, and the calculated viscosity value is used instead of the measured viscosity value. Even if it is indicated, the coal / water paste can be stably produced without substantially changing the viscosity.

  Further, according to the present invention, when the water injection amount to the kneader is adjusted, the control device determines whether there is an abnormality in not only the viscosity measurement value but also the water content measurement value of the coarse coal, and measures the water content of the coarse coal. If it is determined that the value is abnormal, instead of the moisture content measurement value, the normal moisture content measurement value closest to the moisture content measurement value is used. Coal / water paste can be stably produced with almost no fluctuation.

  Further, according to the present invention, when the control device determines the presence or absence of an abnormality in the moisture content measurement value, the control device uses the latest moisture content measurement value in the past, and the latest normal moisture content that does not include the abnormal moisture content measurement value. The amount of measurement is calculated, and this latest normal moisture content measurement value is compared with the moisture content measurement value to determine the presence or absence of abnormality to determine the presence or absence of abnormality, so the reliability is high and the coal / water paste is more stable. Can be manufactured.

  Further, according to the present invention, the coal / water paste manufacturing apparatus according to the present invention further includes an alarm means, and the control device is configured to measure the viscosity measurement value of the coal / water paste, or the viscosity measurement value and the coarseness of the coal / water paste. When it is determined that the measured value of the moisture content of the pulverized coal is abnormal, an alarm is issued via the alarm means, so that the malfunction of the viscometer and / or moisture meter can be dealt with quickly. Thereby, a coal and water paste can be manufactured stably.

It is a figure which shows schematic structure of the coal and water paste manufacturing apparatus 1 of 1st Embodiment of this invention. It is a control system figure of the amount of water injection to the kneader 3 of the present invention.

  FIG. 1 is a diagram showing a schematic configuration of a coal / water paste manufacturing apparatus 1 according to a first embodiment of the present invention. The coal / water paste (CWP) manufacturing apparatus 1 includes a pulverized coal slurry that is a mixture of pulverized coal and water, coarse coal obtained by pulverizing raw coal to a predetermined particle size using a pulverizer, limestone having a predetermined particle size, and water. Is a device for producing a coal-water paste (CWP), a kneader 3 for kneading pulverized coal slurry, coarse coal, limestone and water into CWP, a viscometer 5 for measuring the viscosity of CWP kneaded by the kneader 3 , A pulverized coal slurry supply device 7 for supplying pulverized coal slurry to the kneader 3, a coal feeder 9 for supplying coarse pulverized coal to the kneader 3, a kneader water injection device 11 for supplying water for viscosity adjustment to the kneader 3, A control device 13 and an alarm device 14 for controlling the amount of water injected into the kneading machine 3 are provided.

  The kneading machine 3 is a horizontal kneading machine, and is from a pulverized coal slurry supplied from a pulverized coal slurry supply device 7, coarse pulverized coal and limestone supplied from a coal feeder 9, and, if necessary, from a kneader water injection device 11. The supplied viscosity adjusting water is continuously received and kneaded to produce CWP. The CWP is controlled to have a viscosity value set within a range of 4 to 10 Pa · s. The water content of CWP is about 24-25% by weight and the coal concentration is about 69-70% by weight. The manufactured CWP is sent to the CWP tank 17 through the distribution conveyor 15 and then supplied to the furnace (not shown) via a CWP pump (not shown). The kneading machine 3 is driven by a motor 25, and an ammeter 27 for measuring current is attached to the motor 25. This current value is sent to the control device 13 and used for adjusting the amount of water injected into the kneader 3 as required.

  The pulverized coal slurry is a mixture of pulverized coal and water whose viscosity is adjusted to a predetermined viscosity value within a range of 100 to 400 mPa · s. The water content of the pulverized coal slurry is about 48 to 50% by weight, and about 70% by weight of the water contained in the CWP is water brought from the pulverized coal slurry. The pulverized coal slurry is produced by pulverizing a predetermined amount of coarse coal and water with a pulverizer (not shown), and transferred to the slurry service tank 29 by a slurry transfer pump (not shown). Thereafter, the slurry is supplied to the kneader 3 via a slurry supply pump 31 interposed in a pipe line connecting the slurry service tank 29 and the kneader 3. The pulverized coal slurry supply device 7 is constituted by the slurry service tank 29, the pipe line and the slurry supply pump 31.

  Coarse coal is coal having an average particle size of 2 mm or less obtained by pulverizing raw coal with a pulverizer. Coarse coal stored in the pulverized coal relay hopper 19 is supplied to the kneader 3 via the coal feeder 9. . At this time, limestone is also sent from the limestone bunker 21 to the coal feeder 9 and supplied to the kneader 3 together with the coarse coal. About 75% by weight of the coal contained in CWP is supplied as coarse coal. The raw coal normally contains about 10% by weight of water, but the moisture content varies depending on the environment of the coal yard and the weather. For this reason, the non-contact optical moisture meter 23 is attached to the coal feeder 9, whereby the moisture content of the coarse coal is measured online. The water content of the coarse coal is sent to the control device 13 and used for adjusting the amount of water injected into the kneader 3.

  Water is poured into the kneader 3 by the kneader water injection device 11. The kneading machine water injection device 11 is a device for supplying water for viscosity adjustment, and includes a water injection flow rate adjustment valve 35 in the middle of a water injection pipe provided on the discharge side of the water injection pump 33, and the control device 13 is a water injection flow rate adjustment valve. The amount of water injected into the kneading machine 3 is adjusted by controlling the valve opening of 35. The CWP viscosity increases or decreases as the amount of water injected increases or decreases.

  A viscometer 5 is attached to the outlet of the kneader 3, and the viscometer 5 measures the viscosity of CWP discharged from the kneader 3 online. The measured viscosity measurement value is sent to the control device 13 and used for adjusting the amount of water injected into the kneader 3. The viscometer 5 is provided at the kneader exit, and includes a CWP introduction guide plate (not shown), a viscosity measuring container (not shown), a pin-type rotor (not shown), a torque meter (not shown), a CWP discharge gate, and a cleaning. A nozzle (not shown) is provided. Part of the CWP discharged from the kneader outlet is guided to the viscosity measuring container via the CWP introduction guide plate, the pin type rotor is rotated, and the stirring torque at this time is measured with a torque meter. Since there is a correlation between the stirring torque and the CWP viscosity, the CWP viscosity can be easily obtained by acquiring the relationship between the stirring torque and the CWP viscosity in advance. When the viscosity measurement is completed, the CWP discharge gate is opened and CWP is discharged, and water is injected into the viscosity measurement container and the like to perform cleaning. These operations are automatically performed at predetermined intervals via the control device 13.

  The control device 13 includes input / output means for inputting / outputting signals, storage means for storing measured values input through the input means, and calculation means, and the kneader outlet is set so that the CWP viscosity at the kneader outlet becomes a set value. The amount of water injected into the kneader 3 is adjusted using the measured CWP viscosity value, the measured water content of the coarse coal, and the measured motor current of the kneader 3 as necessary.

  FIG. 2 is a control system diagram of the amount of water injected into the kneader 3. Adjustment of the amount of water injected into the kneader 3 is performed in the following manner. The CWP viscosity measurement value 51 at the kneader outlet and the motor current measurement value 53 of the kneader 3 sent from the viscometer 5 are taken online, and it is determined whether or not the CWP viscosity measurement value 51 is abnormal. This determination procedure will be described later. If it is determined that the CWP viscosity measurement value 51 is not abnormal, the CWP viscosity measurement value 51 is sent to the subtractor 57 via the analog switch 55. On the other hand, if it is determined that the CWP viscosity measurement value 51 is abnormal, a signal 56 indicating abnormality is sent to the analog switch 55, and the analog switch 55 uses the function generator 59 in place of the CWP viscosity measurement value 51 to send the motor current. The CWP viscosity value 61 calculated from the measured value 53 is sent to the subtractor 57 via the analog switch 55. Since there is a correlation between the motor current of the kneader 3 and the CWP viscosity at the kneader outlet, the viscosity of the CWP can be calculated from the motor current measurement value 53 by measuring these relationships in advance.

  A procedure for determining whether or not the CWP viscosity measurement value 51 is abnormal will be described. A difference between the CWP viscosity setting value 63 at the kneader outlet and the CWP viscosity measurement value 51 is obtained, and if this difference exceeds a predetermined value A, it is determined that there is an abnormality. When the CWP manufacturing apparatus 1 is operating normally, the measured CWP viscosity value 51 at the kneader outlet is the same as the CWP viscosity setting value 63 with some variation. For this reason, it can be said that the CWP viscosity measurement value 51 is abnormal when the CWP manufacturing apparatus 1 exceeds the normal fluctuation range B with respect to the CWP viscosity setting value 63. If the predetermined value A is the maximum value of the fluctuation range B + the allowance α, the abnormality of the CWP viscosity measurement value 51 can be easily determined.

  Another procedure for determining whether or not the CWP viscosity measurement value 51 is abnormal will be described. Although the presence or absence of an abnormality may be determined every time the CWP viscosity measurement value 51 is taken in, the CWP viscosity measurement value 51 exceeds a predetermined value A with respect to the CWP viscosity setting value 63 within a predetermined number of times. Sometimes, it may be determined as abnormal. For example, when the CWP viscosity measurement value 51 is taken 10 times, it may be determined as abnormal when the CWP viscosity measurement value 51 exceeds a predetermined value A with respect to the CWP viscosity setting value 63 three times or more. If this method is adopted, sudden errors in the electrical system and the like can be eliminated, and abnormal measurement values based on mechanical troubles of the viscometer 5 can be detected. The interval of CWP viscosity measurement at the kneader outlet is overwhelmingly short compared to the average residence time in the CWP kneader 3, so even if this method is adopted, adjustment of water injection amount and viscosity control of CWP are adversely affected. Never give.

  The subtractor 57 calculates a deviation between the CWP viscosity setting value 63 at the kneader outlet and the CWP viscosity measurement value 51 or the CWP viscosity value 61 sent via the analog switch 55, and sends this to the adder 65. The water content measurement value of the pulverized coal is sent to the adder 65 in the following manner.

  The moisture content measurement value 67 of the coarse coal sent from the moisture meter 23 is taken online, and it is determined whether or not the moisture content measurement value 67 is abnormal. This determination procedure will be described later. If it is determined that the moisture content measurement value 67 is not abnormal, the moisture content measurement value 67 is sent to the adder 65 via the analog switch 69. On the other hand, if it is determined that the moisture content measurement value 67 is abnormal, a signal 71 indicating abnormality is sent to the analog switch 69, and the analog switch 69 replaces the moisture content measurement value 67 and the moisture content measurement value 67 determined to be abnormal. The most recent normal water content measurement value 73 is sent to the adder 65 via the analog switch 69.

A procedure for determining whether or not the measured water content 67 of the coarse coal is abnormal will be described. Based on the moisture content measurement value M ₀ to be determined, the latest past moisture content measurement values, for example, the previous 10 moisture content measurement values M _{1 to} M ₁₀ are read from the storage means, and this average value AV ₁ is obtained. Ask. The difference between the average value AV ₁ and each of the measured water content values M _{1 to} M ₁₀ is obtained, and all the differences between the average value AV ₁ and the measured water content values M _{1 to} M ₁₀ are equal to or less than a predetermined value C. if, to the average value AV ₁ and the nearest normal water content measurements. On the other hand, when there is a water content measurement value having a difference exceeding the predetermined value C, the measurement value, for example, M ₁ is deleted, and the average value AV ₂ is again used with the remaining water content measurement values M _{2 to} M _10. And repeat the above method to calculate the latest normal water content measurement. Obtains a difference between the most recent normal moisture content measured and water content measurements M _0, the difference is determined to be abnormal when exceeding a predetermined value D. When the moisture content measurement value M ₀ is simply compared with the previous moisture content measurement value M ₁ , if an abnormality appears in the moisture content measurement value twice in succession, inconvenience occurs. On the other hand, the most recent normal water content measurement value calculated in the above manner is preferable because there is no room for an abnormal water content measurement value.

  Another procedure for determining whether or not the measured water content 67 of the coarse coal is abnormal will be described. The moisture content of the coarse coal as the initial value is defined as the moisture value obtained by manual analysis and the measured moisture content M. A difference between the measured moisture content 67 is calculated using the measured moisture content M as a reference value. If the difference is equal to or less than a predetermined value E, the measured moisture content 67 is used as the reference value. On the other hand, when the difference exceeds a predetermined value E, the moisture content measurement value M is kept at the reference value. By repeating this in sequence, basically, the previous measured normal moisture content value becomes the reference value, and it is judged whether there is an abnormality by comparing this reference value with the moisture content measurement value 67. Can do. If it is determined that the water content measurement value is abnormal, the previous water content measurement value as the reference value is used as the most recent normal water content measurement value. This method can easily determine whether or not the measured water content 67 of the coarse coal is abnormal.

  The adder 65 adds the measured moisture content 67 or normal measured moisture 73 of the pulverized coal sent via the analog switch 69 to the deviation sent from the subtractor 57, and sends a control signal to the water injection flow adjustment valve 35. .

  When the controller 13 determines that the measured CWP viscosity value 51 at the kneader outlet and / or the measured moisture content 67 of the pulverized coal is abnormal, it sends a signal to the alarm device 14 and issues an alarm via the alarm device 14. The abnormality of the CWP viscosity measured value 51 and / or the coarse coal water measured value 67 at the kneader outlet is reported. A known alarm device can be used as the alarm device 14. Thereby, it is possible to quickly cope with the malfunction of the viscometer 5 or the moisture meter 23.

  The control device 13 uses the CWP viscosity measurement value 51 at the kneader outlet and the water content measurement value 67 of the coarse coal to adjust the water injection amount to the kneader 3 so that the CWP viscosity at the kneader outlet becomes a set value. This control procedure is also used in the conventional CWP manufacturing apparatus. In order to stably produce CWP, the control device 13 does not substantially change the CWP viscosity at the outlet of the kneader even when the viscometer 5 and / or the moisture meter 23 is malfunctioning, the measured CWP viscosity value 51 and / or moisture It is determined whether or not the amount measurement value 67 is abnormal. If it is determined that the amount measurement value 67 is abnormal, the CWP viscosity value 61 calculated from the motor current measurement value 53 of the kneader 3 is used instead of the CWP viscosity measurement value 51. If it is determined that there is an abnormality, the most recent normal water content measurement value 73 is used to adjust the water injection amount to the kneader 3. It is well known that the ammeter 27 for measuring the motor current of the kneading machine 3 has almost no malfunction because there is no operating part unlike the viscometer 5. As shown in Tables 1 and 2, as troubles of the viscometer 5 and the moisture meter 23, there are troubles that inevitably occur during operation. The CWP manufacturing apparatus 1 shown in the present embodiment is stable in a pressurized fluidized bed boiler. Contributes greatly to driving.

DESCRIPTION OF SYMBOLS 1 Coal and water paste manufacturing apparatus 3 Kneading machine 5 Viscometer 7 Pulverized coal slurry supply device 9 Coal feeder 11 Kneading machine water injection device 13 Control device 14 Alarm device 23 Moisture meter 25 Motor 27 Ammeter 29 Slurry service tank 31 Slurry supply pump 31 33 Water injection pump 35 Water injection flow rate adjustment valve

Claims (4)

Pulverized coal slurry, pulverized coal, limestone and water kneading machine to make coal / water paste, viscometer to measure the viscosity of coal / water paste at the kneader outlet, moisture meter to measure the water content of pulverized coal, Equipped with a kneader water injection device that supplies water for viscosity adjustment to the kneader, and a control device that controls the kneader water injection device, and measures the viscosity of the coal / water paste at the kneader outlet and the moisture content of the coarse coal. In the coal / water paste manufacturing apparatus, the control device adjusts the amount of water injected into the kneader using these measured values, and controls the viscosity of the coal / water paste within a set range.
An ammeter that measures the motor current of the kneader on-line is installed,
The controller determines whether or not the viscosity measurement value of the coal / water paste is abnormal when adjusting the amount of water to be added to the kneader, and if the viscosity measurement value is not abnormal, uses the viscosity measurement value. When the viscosity measurement value is determined to be abnormal, the viscosity value is calculated from the motor current measurement value of the kneader, and the calculated viscosity value is used instead of the viscosity measurement value. apparatus.   When the control device further adjusts the amount of water injected into the kneader, it determines whether there is an abnormality in the measured water content of the coarse coal, and if the measured water content is not abnormal, The normal water content measurement value closest to the water content measurement value is used instead of the water content measurement value when it is determined that the water content measurement value is abnormal. Coal / water paste production equipment.   The control device includes a storage unit that stores the moisture content measurement value, and reads a plurality of recent past moisture content measurement values from the storage unit with reference to the moisture content measurement value for determining whether there is an abnormality, and obtains an average value. , Calculate the difference between the average value and each moisture content measurement value used to calculate the average value, and if all the differences are less than or equal to a predetermined value, the average value is the latest normal moisture content measurement value, the difference is If there is a moisture content measurement value that exceeds the specified value, the average value is calculated again, excluding the moisture content measurement value, and the most recent normal moisture content measurement value is calculated according to the above procedure. The difference between the measured value and the moisture content measurement value for determining the presence or absence of an abnormality is obtained, and when the difference exceeds a predetermined value, it is determined that the moisture content measurement value is abnormal. Coal / water paste production equipment. Furthermore, an alarm means is provided,
When the controller determines that the measured viscosity value of the coal / water paste, or the measured viscosity value of the coal / water paste and the measured moisture content of the coarse coal are abnormal, an alarm is issued via an alarm means. The coal / water paste manufacturing apparatus according to any one of claims 1 to 3.

Images