JPH09241665A - Apparatus for producing and supplying coal/water slurry - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve energy efficiency and reliability of a plant by properly maintaining the water content and fluidity of a coal/water slurry fuel, suppressing latent heat loss in combustion and avoiding troubles caused by fuel clogging, etc. SOLUTION: This device controls flow rates of means 35 and 38 for supplying water to a blending means, an auxiliary water supplying means 47, etc., based on measured values of water content measuring means 46a and 46b for coal to be supplied to blending means 17 and 8, a load measuring means 45 for the blending means 17, a stirring load measuring means 41 for the stirring means 22 and a force feed load measuring means 42 for a force feed means 27.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel facility, and more particularly to an apparatus suitable for stably producing and supplying the properties of coal / water slurry fuel.

[0002]

2. Description of the Related Art A combination of coal and water slurry that uses coal fuel in a fluidized state as a fuel for a fluidized bed boiler is
It is known that the method is capable of supplying fuel into the fluidized bed under pressure by a pump, and is therefore advantageous in handling property, stability and economical efficiency as compared with the dry type. Among the above coal / water slurry fuels, the one having a relatively coarse particle size and a low water content is a coal / water paste (hereinafter abbreviated as CWP), and FIG. 2 shows a configuration of a conventional CWP manufacturing and supplying device. It is a flow sheet.

Raw coal is produced from raw coal bunker 1 to raw coal shred.
It is supplied quantitatively by the coal feeder 3 through the grate 2 and the crusher 4
The crushed coal is crushed and is temporarily stored in the crushed coal hopper 5. The crushed coal in the crushed coal hopper 5 is divided into two, and one is crushed coal feeder A6 and crushed coal pipe A7 and screw screw.
It is supplied quantitatively to the da 11 and enters the wet mill 8. Further, the wet mill 8 is supplied with water from a water tank 32 through a water supply pipe A35 whose water flow rate is controlled by a water pump A33 and a water supply adjusting valve 34. The rotation of the motor 10 is transmitted to the wet mill 8 via the speed reducer 9, and the coal in the wet mill 8 is finely pulverized and simultaneously mixed with water to be a fine powder slurry and stored in the fine powder slurry tank 23. .

The other crushed coal in the crushed coal hopper 5 is
The crushed coal feeder B12 is supplied to the kneading machine 17 quantitatively through the crushed coal pipe B13. And limestone hopper 14
From the limestone feeder 15, the limestone 16 is supplied to the kneading machine 17 in a fixed quantity, and the water pump B is supplied from the water tank 32.
The water flow rate is controlled by 36 and the water supply adjusting valve B37, and the water is supplied to the kneading machine 17 through the water supply pipe B38. Further, the fine powder slurry in the fine powder slurry tank 23 is also fed to the fine powder slurry pump 24.
The flow rate is controlled by the number of rotations, and the same is supplied to the kneading machine 17 through the three-way valve 25 and the fine powder slurry pipe 26.

The rotation of the motor 18 is transmitted to the kneading machine 17 through the speed reducer 19, and the four raw materials supplied into the kneading machine 17 are kneaded to obtain a mixture. This mixture is CWP, which is discharged as a product from the kneading machine 17 and supplied to the CWP hopper 21. CW stored in the CWP hopper 21
The required amount of P is the CWP pump 2 depending on the combustion load of the boiler.
7, and is supplied by being injected into the combustion furnace by a CWP nozzle 30 through a CWP pipe 28 and a three-way valve 29.

Crushed coal supplied to the above kneader 17,
The respective flow rates of the four raw materials of water, limestone, and fine powder slurry are set so that the mixture has the fluidity and the blending ratio required as the CWP fuel. Further, in order to keep the mixing ratio of fine powder to crushed coal and the water content of CWP within the proper range, the supply amount of three raw materials of crushed coal, water and fine powder slurry among the above four raw materials to the kneader 17 is controlled. To do.

[0007]

SUMMARY OF THE INVENTION The CWP pump 27
In order to send the CWP by the CWP, the CWP needs to be in the form of a slurry having fluidity. But on the other hand,
When CWP is used as the fuel for obtaining heat energy as in the above example, it is desired to keep the total water content in the CWP as low as possible. That is, in order to improve the energy efficiency of the plant, it is required to minimize the latent heat loss due to the evaporation of water in the fuel during combustion. Therefore, increasing the amount of water added when kneading coal should be avoided.

In the conventional apparatus, the flow rate of each of the four raw materials is set to a product ratio, and the mixing ratio of fine powder to crushed coal having a coarse particle size and the water content of CWP are controlled within appropriate ranges. Had set. In particular, since the change in the water content of CWP has a great effect on its fluidity, the product C
The proportion of water contained in WP was measured by a water content meter, and the respective flow rates of the three raw materials of crushed coal, water, and fine powder slurry to the kneader 17 were controlled so that the measured water content was in an appropriate range.

However, in the device using the above control method,
It was difficult to maintain the fluidity of the CWP fuel stably for the following reasons.

(1) Moisture contained in the raw material coal itself is not constant but constantly changes. In order to keep the water content of CWP constant, when the flow rate of each raw material such as the amount of water supplied to the kneading machine 17 is controlled based on the measured water content of CWP obtained as a product, the water content of this raw coal is constantly changed. However, it is difficult to perform appropriate control immediately, and it is difficult to keep the moisture content of CWP stable.

(2) Raw coal and crushed coal flow due to subtle changes in the particle size distribution of crushed coal due to changes in the pulverizability of coal and the degree of drying (water content) even if the operating conditions of the crusher are the same. Sex changes.

(3) The properties of raw coal (chemical composition of coal, proportion of ash, etc.) are not constant but constantly change. In particular, it is known that coal generally oxidizes over time, and as oxidation progresses, Ph decreases, so that the viscosity in the CWP state increases and the fluidity deteriorates even with the same water content.

(4) The CWP discharged from the kneading machine 17 is temporarily stored in the CWP hopper 21, and the water that gives fluidity to the CWP is absorbed by the lime 16 or
The fluidity decreases with the passage of time due to the evaporation of water.

As described above, it is necessary to pay attention to changes in water content and properties of raw coal in order to stably maintain the quality properties of CWP. However, since these are invisible and constantly change during operation, the water content and viscosity of the CWP change and the fluidity is impaired, and it becomes impossible to pump the pump or the piping is clogged and the fuel supply is interrupted. Not a few things. In particular, in the conventional apparatus, even if the water content in the CWP is kept constant, stable fluidity is not always obtained. This means that the supply efficiency of the CWP pump fluctuates, or in some cases the plant is stopped due to fuel clogging. Was causing serious troubles.

The present invention solves the above problems, maintains proper water and fluidity of coal / water slurry fuel, and avoids troubles such as plant stoppage caused by clogging of coal / water slurry fuel. It is an object of the present invention to provide a coal / water slurry production and supply device which is effective in improving the reliability of the entire plant and at the same time minimizing the latent heat loss during combustion and improving the energy efficiency of the plant.

[0016]

The first object is to provide a mixing means for mixing a mixture containing crushed coal and water, a crushed coal supply means for supplying the crushed coal to the mixing means, and In a coal and water slurry production and supply apparatus having water supply means for supplying water to a mixing means, a mixing load measuring means for measuring a mixing load of the mixing means, and a moisture measurement for measuring a moisture content of crushed coal And a control means for controlling at least one of the supply amount of the water supply unit and the supply amount of the crushed coal supply unit based on the mixing load and the moisture content of the crushed coal. Achieved by coal and water slurry production and supply equipment.

By continuously detecting the water content in the coal entering the mixing means, the change in water before and during mixing can be continuously detected, and the water supply amount can be adjusted in advance in response to this change. And the minimum water content of coal that has fluidity
A stable water slurry can be obtained. In addition, the load at the time of mixing in the kneader, which is the mixing means, is related to the fluidity of the coal / water slurry that is the mixture, and if the volume and flow rate are constant and the fluidity is the same, the mixing load is always constant, but the viscosity The higher the flow rate and the poorer the fluidity, the higher the resistance and the more mixed load is required. The change in the mixing load is detected by the torque measuring means, the drive motor current, etc., and the control means changes the supply amount of each raw material to the mixing means so that the value is constant,
For example, when the torque becomes large, the fluidity of the coal / water slurry can be maintained by performing control such as increasing the water supply amount or decreasing the coal supply amount.

Secondly, the above-mentioned object is a stirring means for stirring the coal / water slurry supplied from the mixing means in a container,
Auxiliary water supply means for supplying water to the container of the stirring means, stirring load measuring means for measuring the stirring load of the stirring means, and the supply amount of the auxiliary water supply means and the water based on the stirring load. This is achieved by the first coal / water slurry production and supply device, characterized in that it comprises control means for controlling one or more of the supply amount of the supply means and the supply amount of the crushed coal supply means.

In the case where the apparatus is provided with an agitating means for temporarily storing the coal / water slurry supplied from the mixing means in a container such as a hopper, and agitating the auxiliary means for supplying water into the container of the agitating means. Using the same principle as that in which the objective water supply means is provided and the flow rate of each supply amount is controlled based on the mixing load in the first device, the agitation means measures the agitation load based on the agitation load detected by the agitation load measuring means. The fluidity of coal and water slurry can be maintained by controlling the amount of water supply.

Thirdly, the above-mentioned object is, the pumping means for pumping the coal / water slurry supplied from the mixing means, the pumping load measuring means for measuring the pumping load of the pumping means, and the auxiliary based on the pumping load. This is achieved by the second coal / water slurry production and supply device characterized by comprising control means for controlling the supply amount of the static water supply means.

The coal / water slurry with reduced fluidity causes an increase in load on the pumping means, and appears as pressure loss. Therefore, the fluidity of the coal / water slurry is reduced by detecting the degree of change in the pumping load by measuring the pumping load in the pumping means, such as detecting the pressure loss or the change in discharge pressure at the pump outlet side. Is detected, water is supplied by the auxiliary water supply means, and the viscosity is reduced to control. As a result, even if the fluidity of the coal / water slurry that has once been stored decreases due to some cause such as the evaporation of water during storage, the fluidity is recovered and the
It is possible to avoid clogging of the water slurry fuel injection supply unit.

Fourthly, there is provided a wet mill in which the mixing means further crushes the crushed coal supplied from the crushed coal supply means and mixes it with the water supplied from the water supply means.
It is composed of a kneader that mixes the mixture obtained in a wet mill, the crushed coal supplied from the crushed coal supply means and the water supplied from the water supply means, and based on the mixing load of the kneader. The present invention is achieved by any one of the first to third coal / water slurry production / supply devices, which is equipped with a control means for controlling the supply amount of the mixture obtained by the wet mill.

The apparatus of the present invention can maintain more stable fluidity when the mixing means is constituted by a wet mill and a kneader as in the conventional CWP manufacturing and supplying apparatus.

Fifthly, the above object is characterized in that a water content measuring means for measuring the water content of the crushed coal is provided at the outlet of the crushed coal supply means.
It is achieved by any one of the coal and water slurry production and supply equipment.

It is desirable that the measurement position of the water content measuring means is just before the crushed coal is mixed with water or other raw materials, because the water will fly during the crushing and will be dried in the coal hopper in the crushing coal hopper. Therefore, when there are a plurality of mixing means, the water content of the coal supplied can be measured more accurately by setting it near the outlet of each coal feeding device.

The above object is also to provide mixing means for mixing a mixture containing crushed coal and water, crushed coal supplying means for supplying the crushed coal to the mixing means, and water for supplying water to the mixing means. In a coal and water slurry production and supply device provided with a supply means, the coal supplied from the mixing means
A stirring means for stirring the water slurry in the container, an auxiliary water supply means for supplying water to the container of the stirring means, a stirring load measuring means for measuring the stirring load of the stirring means, and based on the stirring load A coal / water slurry characterized by comprising control means for controlling one or more of the supply amount of the auxiliary water supply means, the supply amount of the water supply means and the supply amount of the crushed coal supply means. Achieved by manufacturing supply equipment

The fluidity of the coal / water slurry can be recovered only by controlling the auxiliary water supply amount to the stirring means based on the stirring load detected by the stirring load measuring means in the stirring means container.

[0028]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below with reference to specific examples. FIG. 1 is a flow chart showing the configuration of the CWP manufacturing and supplying apparatus of the present invention.

Raw coal is supplied from the raw coal bunker 1 to the crusher 4, is roughly crushed, and is stored in the crushed coal hopper 5. The crushed coal in the crushed coal hopper 5 is divided into two, and one is supplied to the screw feeder 11 by the crushed coal feeder A6 and enters the wet mill 8. Further, the flow rate of water is controlled by the water pump A33 and the water supply adjusting valve 34, and the wet mill 8 is supplied with water. In the wet mill 8, coal is pulverized and at the same time mixed with water to form fine powder slurry which is stored in the fine powder slurry tank 23. The other crushed coal in the crushed coal hopper 5 is quantitatively supplied to the kneading machine 17 by the crushed coal feeder B12 through the crushed coal pipe B13. And limestone 16 is limestone
It is supplied to the kneading machine 17 by a fixed amount by the da 15 and the flow rate of water is controlled by the water pump B36 and the water supply adjusting valve B37 to be supplied to the kneading machine 17 through the water supply pipe B. Further, the fine powder slurry in the fine powder slurry tank 23 is also fed to the fine powder slurry pump 2
The flow rate is controlled by the number of rotations of 4 and is supplied to the kneading machine 17. In the kneading machine 17, the above four raw materials are kneaded,
CWP hopper 21 discharged from kneader 17 as CWP
Is supplied to. The CWP stored in the CWP hopper 21 is delivered by the CWP pump 27 in a required amount according to the combustion load, and is injected into the furnace by the CWP nozzle 30.

The crushed coal feeder B12 has a moisture meter 4 which is a moisture measuring means for measuring the moisture content of the crushed coal.
6b is installed to continuously measure the water content in the crushed coal. The measurement signal generated by the moisture meter 46b is input to the controller 43, which is the center of the control means, via the electrical connection 44. Based on this input, the controller 43 calculates the water content of the additive CWP and the flow rate of the water supply pipe B which is the water supply means, and supplies the water supply pipe B3 so as to always maintain this water content appropriately.
A correction signal for controlling the flow rate of water supplied from 8 to the kneading machine 17 is generated. This correction signal is input as an output of the controller 43 to the water supply adjusting valve 37 via an electrical connection, and controls the opening degree of the water supply adjusting valve 37. As a result, the flow rate of the water supply pipe B, which is the water supply means, can be controlled prior to the mixing in the kneading machine 17, so that the coal and water supplied to the kneading machine 17 can be changed even if the water content in the raw coal fluctuates. It is possible to maintain a constant ratio.

Similarly, the crushed coal feeder A6 is also provided with a moisture meter 46a, which is a moisture measuring means for measuring the moisture content of the crushed coal, to continuously measure the moisture in the crushed coal.
The measurement signal of 46 a is input to the controller 43 via the electrical connection 44. In the controller 43, the water content of the crushed coal is added to the flow rate of the water supply pipe A to the wet mill 8 to calculate the ratio of water contained in the fine powder slurry, and the water supply pipe is always maintained at an appropriate value. Wet mill 8 from A35
Generate a correction signal to control the water supply flow rate to the. This correction signal is sent to the water supply adjusting valve 34 as an output of the controller 43 via an electrical connection, and controls the opening degree of the water supply adjusting valve 34. As a result, even when the moisture content of the crushed coal supplied to the wet mill 8 fluctuates, prior to the mixing in the wet mill 8, based on the signal from the moisture meter 46a, the water supply pipe A35, which is the water supply means, can be used. The flow rate can be controlled, and the moisture content of the fine powder slurry supplied to the kneading machine 17 can be kept constant.

In the kneading machine 17 which is a mixing means, between the driving motor 18 and the speed reducer 19 and the main body of the kneading machine 17, a mixing load measurement for measuring the mixing load when coal and water are mixed is measured. A torque meter 45 as a means is installed. The measurement signal generated by the torque meter 45 is input to the controller 43, which is the center of the control means, via the electrical connection 44. The controller 43 which receives the output signal of the torque meter 45
Then, the deviation between the measured signal value and the standard value is calculated, and the kneading machine 1
A control signal is generated to control the flow rate of water supply to 7.
The control signal is input to the water supply adjusting valve B37 via electric connection to adjust the opening of the valve. Further, the controller 43 generates a control signal for controlling the supply amount of the fine powder slurry to the kneading machine 17 based on the measurement signal of the torque meter 45. The control signal is input to the fine powder slurry pump 24 via an electrical connection to control the rotation speed. For example, when an increase in the kneading torque is detected by the torque meter 45, the fluidity of the CWP has decreased, so the water supply amount by the water supply pipe B38 is increased and the supply amount of the fine powder slurry pump 24 is decreased. Controls to reduce viscosity. In this way, the fluidity of the CWP discharged from the kneading machine 17 can be maintained constant by performing feedback control so that the torque measurement value of the torque meter 45 is maintained within a constant range.

Further, the CWP hopper 21 of the stirring means container part
Also in the above, a torque meter 41, which is a stirring load measuring means, is installed between the agitator 22, which is a stirring means, and the driving motor 39 and the speed reducer 40, and the stirring torque of the agitator 22 is measured. Similar to the case of the torque meter 45, the torque meter 41
The control signal generated by the controller 43 is used to control the opening of the water supply adjusting valve C48 based on the measurement signal output by the controller 43 to adjust the amount of water supplied by the water supply pipe C47 which is the auxiliary water supply means. As a result, the CWP hopper 2 is discharged from the kneading machine 17.
The water in the CWP temporarily stored in 1 is the above-mentioned lime 16
Even if the fluidity is lowered due to the shift to, the evaporation, etc., the CWP hopper 21 is supplied with water so as to keep the stirring torque within a certain range, and the fluidity can be prevented from being lowered.

A pressure transmitter 42, which is a pressure-feeding load measuring means, is provided in the CWP pipe 28 on the outlet side of the CWP pump 27, which is a pressure-feeding means.
Has been contacted. CW stored in the CWP hopper 21
The pressure in the CWP pipe 28 when P is pressure-fed by the CWP pump 27 according to the combustion load is detected by the pressure transmitter 42, and when this pressure becomes abnormally high, an output signal is output to the controller 43. To do. The controller that received this
At LA 43, it is determined that the fluidity of the CWP in the CWP pipe 28 has decreased, and a control signal is input to the water supply regulating valve C48 via electrical connection to increase the opening degree of the water supply regulating valve C48 to supplement the auxiliary water. It operates so as to increase the amount of water supplied to the CWP hopper 21 by the water supply pipe C47, which is the supply means, to ensure fluidity.

According to the apparatus having the above-mentioned structure, it is possible to maintain the fluidity of the CWP stably without mixing more water than necessary, improving the reliability of the plant and at the same time increasing the efficiency. Enable operation.

The position at which the detectors of the moisture meters 46a and 46b are installed is not particularly limited as long as it is a portion before mixing, but the coal feeder 3 and the crusher 4 on the inlet side are not particularly limited.
Since water flies at the time of crushing and is dried in the crushed coal hopper 5 during coal storage, if the portion just before mixing with water or limestone is used, more accurate measurement of the water content of the supplied coal can be performed. It is desirable to measure on the lower side of the crushed coal feeders 6 and 12 as in the above example, or generally on the belt of the belt feeder.

In the above example, the load torque was detected by a torque meter as the mixing load measuring means for mixing coal and water and the stirring load measuring means for coal / water slurry. Any means for detecting kneading energy such as electric current and electric power may be used. Which means should be selected depends on the problem of the accuracy of detecting the displacement and the economical efficiency of the additionally installed instrument, and the measuring means may be appropriately selected and adopted depending on the quality requirement of the intended coal / water slurry fuel. In addition, the CW pump 27, which is the pressure feeding means, can also be used as the pressure feeding load measuring means.
A measuring means that enables accurate detection may be adopted in consideration of the characteristics of the P pump, the reference discharge pressure, and the like.

In the above embodiment, the moisture meter 46 is used.
a, 46b, torque meters 45, 41, and pressure transmitter 42
Based on the measurement signal of, the control signals of the feeders 6 and 12 for coal feeding are generated by the controller 43, and the fluidity and the mixing ratio are adjusted by controlling the coal feeding amount instead of the water feeding amount. It is also possible to Further, in the above example, the configuration of the manufacturing / supplying device of CWP fuel, which is a kind of coal water slurry without using additives, is shown. The configuration of the present invention is (1) coal and water, additives, etc. (2) Coal / water slurry fuel production / supply device for kneading with other raw materials, etc. (2) Coal / water slurry fuel production / supply device for kneading with coal and other raw materials after dry pulverizing coal without wet pulverization 3) The present invention can be similarly applied to a coal / water slurry fuel production and supply device in which coal, water, and other raw materials such as additives are kneaded at the same time during wet pulverization.

[0039]

According to the apparatus of the present invention, the flow rate of each raw material is controlled based on the measured water content of coal to be supplied, the measured load value during mixing and stirring, and the measured pressure value during pressure feeding. This automatically maintains a stable water content in the coal / water slurry fuel that is used as a product, and enables fluidization in response to a decrease in fluidity due to the properties of the raw coal and the quality of the water supplied. The flow rate can be controlled so as to secure the property.
Therefore, it is possible to avoid clogging of the coal / water slurry fuel and troubles such as operation stoppage of the device resulting from the clogging and to improve the reliability of the entire plant. At the same time, it is possible to always obtain stable quality characteristics without increasing the water content in the coal / water slurry fuel more than necessary, and it is effective in improving the efficiency of the plant by minimizing the latent heat loss during combustion.
In addition, automation eliminates the need for human judgment, which greatly saves labor. As described above, with the configuration of the present invention, it is possible to realize a highly reliable and economical coal / water slurry manufacturing and supplying apparatus.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a coal / water slurry fuel production and supply device according to the present invention.

FIG. 2 is a configuration diagram of a conventional coal / water slurry fuel production / supply device.

[Explanation of symbols]

 1 Raw coal bunker 4 Crusher 5 Crushed coal hopper 6 Crushed coal feeder A 8 Wet mill 12 Crushed coal feeder B 14 Limestone hopper 17 Kneader 21 CWP hopper 22 Stirrer 23 Fine powder slurry tank 27 CWP pump 32 Water tank 35 Water supply pipe A 38 Water supply pipe B 41 Torque meter 42 Pressure transmitter 43 Controller 45 Torque meter 46a Moisture meter 46b Moisture meter 47 Water supply pipe C

Claims (6)

[Claims] 1. Mixing means for mixing a mixture containing crushed coal and water, crushed coal supply means for supplying crushed coal to the mixing means, and water supply means for supplying water to the mixing means. In a coal / water slurry production and supply device provided, a mixing load measuring means for measuring a mixing load of the mixing means, a moisture measuring means for measuring a moisture content of crushed coal, the mixed load and the crushed coal 2. A coal / water slurry manufacturing and supplying apparatus comprising: a control unit for controlling at least one of the supply amount of the water supplying unit and the supply amount of the crushed coal supplying unit based on the water content of the water. 2. A stirring means for stirring the coal / water slurry supplied from the mixing means in a container, an auxiliary water supply means for supplying water to the container of the stirring means, and a stirring load of the stirring means. A stirring load measuring means for measuring, and a control for controlling one or more of the supply amount of the auxiliary water supply means, the supply amount of the water supply means, and the supply amount of the crushed coal supply means based on the stirring load. The coal / water slurry production and supply apparatus according to claim 1, further comprising a means. 3. A pressure-feeding means for pressure-feeding the coal / water slurry supplied from the mixing means, a pressure-feeding load measuring means for measuring a pressure-feeding load of the pressure-feeding means, and an auxiliary water-supplying means based on the pressure-feeding load. The coal / water slurry manufacturing and supplying apparatus according to claim 2, further comprising a control unit that controls a supply amount. 4. The wet mill, wherein the mixing means further crushes the crushed coal supplied from the crushed coal supply means and mixes with the water supplied from the water supply means, a mixture obtained by the wet mill and the crushing. The crushed coal supplied from the coal supply means and a kneader that mixes the water supplied from the water supply means, and the mixture obtained in the wet mill based on the mixing load of the kneader. The coal / water slurry production and supply apparatus according to any one of claims 1 to 3, further comprising a control unit that controls a supply amount to the kneading machine. 5. The coal according to any one of claims 1 to 4, wherein a water content measuring means for measuring a water content of the crushed coal is provided at an outlet of the crushed coal supply means. Equipment for manufacturing and supplying water slurry. 6. A mixing means for mixing a mixture containing crushed coal and water, a crushed coal supply means for supplying the crushed coal to the mixing means, and a water supply means for supplying water to the mixing means. In a coal / water slurry production and supply device provided with, a stirring means for stirring the coal / water slurry supplied from the mixing means in a container, and an auxiliary water supply means for supplying water to the container of the stirring means, A stirring load measuring means for measuring a stirring load of the stirring means; and a supply amount of the auxiliary water supply means, a supply amount of the water supply means and a supply amount of the crushed coal supply means based on the stirring load. A coal / water slurry production and supply device comprising control means for controlling one or more.