JP2002013973A - Powder weighting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a powder weighing device eliminating weighting error of powder weight caused by pressure reaction force in an expansion joints through which high pressure powder passes and reducing an acting load to a frame beam by the pressure reaction force to prevent fracture of the frame beam by high stress. SOLUTION: This powder weighing device is composed so that pressure of the powder housed inside a powder container is raised in a lock hopper and it is led to a weighing hopper via a powder valve opening and closing an outlet passage of the lock hopper, the frame beam for support having expansion joints interposed in its upper and lower sides is provided between the powder valve and the weighting hopper, and the weight of the powder is measured by a load cell. The expansion joints provided above and below the frame beam are composed of pressure balancing type expansion joints balancing pressure in interiors of the expansion joints for blocking action of the pressure reaction force from the expansion joints to the frame beam side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for guiding powder such as pulverized coal and char (combustion residue) contained in a powder container to a weighing hopper disposed below the powder container. A powder weight measuring device provided with a supporting gantry having an expansion joint vertically interposed above the weighing hopper and measuring the weight of the powder introduced into the weighing hopper by a load cell; About.

[0002]

2. Description of the Related Art FIG. 14 shows a conventional powder weight measuring device for measuring the weight of a powder in a powder supply system for supplying powder such as pulverized coal or char to a coal gasifier. Is shown. In FIG. 1, reference numeral 1 denotes a bin for storing the powder to be measured, 11 denotes a weighing hopper installed at the lowermost portion for weighing the powder, and the bin 1 and the weighing hopper 11 are provided. Is provided with a lock hopper 7 for storing the powder by pressurizing the powder to a high pressure of about 30 kg / cm ² .

[0003] The powder line 023 has a powder outlet of the bottle 1 and a powder outlet of the lock hopper 7.
Powder valves 2 and 2 for opening and closing 23 are provided. Also,
In the powder line 023 between the bin 1 and the lock hopper 7 and the powder line 023 between the lock hopper 7 and the weighing hopper 11, supporting gantry beams 5, 5 are interposed. An expansion joint 3 is interposed between the upper and lower surfaces of each of the gantry beams 5, 5 and the powder pipeline 023, respectively. Further, a powder pipe 023 between the upper expansion joint 3 and the lock hopper 7, a powder valve 2 at the outlet of the lock hopper 7, and a lower expansion joint 3
The airtight valves 6 and 6 which can close the powder pipe 023 fluid-tightly are interposed in the powder pipe 023 between them. Reference numeral 4 denotes a load cell for measuring the weight of the weighing hopper 11 in which the powder is stored.

When the powder weight is measured by such a powder weight measuring device, the powder valve 2 and the airtight valve 6 on the upper side are required.
Is opened to send the powder in the bottle 1 into the lock hopper 7, the upper airtight valve 6 is closed, and the pressure of the powder is increased to a high pressure of about 30 kg / cm ² in the lock hopper 7. Press. Next, the powder valve 2 at the outlet of the lock hopper 7 and the airtight valve 6 on the lower side are opened to send the high-pressure powder in the lock hopper 7 into the weighing hopper 11, and the weight of the weighing hopper 11 is reduced by the load cell 4. measure. After being weighed, the high-pressure powder is sent to a coal gasifier.

Here, the lock hopper 7 and the weighing hopper
In the powder pipeline 023 and the expansion joint 3 between the
30kg / cm²High pressure powder that has been pressurized to about
Therefore, the pressure reaction force due to the internal pressure in the expansion joint 3 and the expansion joint
The spring reaction force of the hand 3 is measured by the load cell 4.
Therefore, the actual weight W of the powder stored in the weighing hopper 11
Is calculated by the following equation (1) in consideration of the reaction force.
You. First, the load cell weight W₁Is W₁= W₂+ W + F₁+ F₂  Therefore, the actual weight W of the powder is: W = W₁− (W₂+ F₁+ F₂(1) where W₂: Weight of weighing hopper 11 F₁: Pressure reaction force due to internal pressure in expansion joint 3 (hereinafter referred to as pressure
Reaction force) = P₀・ A₁(P₀Is the expansion joint 3
Pressure, A₁Is the cross-sectional area of the expansion joint 3) F₂: Spring reaction force of expansion joint 3 (hereinafter referred to as spring reaction force)

[0006]

FIG. 16 is a diagram showing the configuration shown in FIG.
Of the expansion joint 3 in the powder weight measuring device
In the diagram showing the relationship between the diameter and the pressure reaction force, the line A is the
P₀= 30kg / cm², Line B is P₀= 1kg / cm²
FIG. 17 shows an expansion joint in the powder weight measuring device.
FIG. 4 is a diagram showing a relationship between the displacement of the hand 3 and the spring reaction force,
Is the spring constant K of the expansion joint 3 = 40 kg / mm, and the B line is K
= 5 kg / mm. Powder weight shown in FIG.
In the quantity measuring device, as described above, 30 kg / cm ²
Pressure reaction force F in the expansion joint 3 through which the high pressure powder passes₁
Is load cell weighing weight W₁Included in. But figure
As shown in line A of FIG. 16, the internal pressure P in the expansion joint 3₀
= 30kg / cm²And the diameter of the expansion joint 3 is 200 mm
The pressure reaction force F₁= About 10,000 kg
Large and therefore the amount of weighed powder is small
Has a load cell weight W₁Calculated from (1) above
A large error occurs in the actual weight W of the powder to be
Body weight is difficult to obtain.

As means for solving such a problem, FIG.
5 has been proposed. In such a device, a pressure canceling expansion joint 03 is provided at a lower portion of the weighing hopper 11, and the pressure canceling expansion joint 03 causes the load cell 4 via the weighing hopper 11 to face the upward direction corresponding to the pressure reaction force F _1. by applying a force to offset the pressure reaction force F _1, which greatly reduces the weighing errors of the powder weight according to the pressure reaction force F _1. Other configurations are the same as those in FIG. 14, and the same members are denoted by the same reference numerals.

However, in the powder weight measuring apparatus shown in Figure 15, as described above, the pressure measuring error of the weight of the powder due to the reaction force F ₁ is greatly reduced, the pressure counteracting expansion joint 03, that is, when the internal pressure P ₀ in the expansion joint 3 is 30 kg / cm ² and the diameter of the expansion joint 3 is 200 mm as described above, the pressure reaction force F ₁ = about 10,000 k
g and an extremely large pressure reaction force act on the lower gantry 5, and the gantry 5 may be broken by high stress.

The present invention has been made in view of the above-mentioned problems of the prior art, and eliminates the measurement error of the powder weight due to the pressure reaction force in the expansion joint through which the high-pressure powder passes. It is an object of the present invention to provide a powder weight measuring device in which the gantry beam is prevented from breaking due to high stress.

[0010]

In order to solve the above-mentioned problems, the present invention is directed to a method for producing powdered coal such as pulverized coal and char (combustion residue) contained in a powder container. The pressure is raised by a lock hopper connected to a pipe from the outlet of the body container, and the pressure is guided to a weighing hopper disposed below the powder valve via a powder valve that opens and closes the outlet pipe of the lock hopper. In addition, between the powder valve and the weighing hopper, a supporting gantry is provided in which an expansion joint communicated with the lock hopper is vertically interposed, and the weighing hopper is provided with a load cell provided in the weighing hopper. In a powder weight measuring device configured to measure the weight of the powder introduced into the hopper for,
The expansion joints provided above and below the gantry are constituted by pressure-balanced expansion joints in which the pressure inside the expansion joint is balanced to prevent the action of a pressure reaction force from the expansion joint to the gantry side. We propose a powder weight measuring device characterized by the following.

According to a second aspect of the present invention, in the first aspect, two of the pressure-balancing type expansion joints are interposed in series by inserting the gantry between the powder valve and the weighing hopper. It is characterized by. According to a third aspect of the present invention, in the first aspect, an airtight valve is provided in the powder passage between the powder valve and the pressure-balancing type expansion joint so as to close the powder passage in a fluid-tight manner. It is characterized by the following. According to a fourth aspect of the present invention, in the first aspect, an airtight valve that allows the powder passage to be fluid-tightly closed is provided between the pressure-balancing expansion joint and the weighing hopper. .

According to a fifth aspect of the present invention, in the first aspect, a spring counteracting the pressure-balanced expansion joint by measuring a displacement between both ends of the pressure-balanced expansion joint. A displacement detector for detecting a force is provided. According to a sixth aspect of the present invention, in the first aspect, between the lower part of the pressure-balancing type expansion joint and the weighing hopper, a reaction force measurement for measuring a reaction force acting downward from the pressure-balancing type expansion joint. The load cells are arranged in series.

According to the first to sixth aspects of the present invention, the expansion joint on the outlet side of the lock hopper through which the high-pressure powder passes is a pressure balanced expansion joint in which pressure is balanced inside. The force applied from the upper and lower end surfaces of the joint to the powder pipe line, that is, the pressure reaction force is suppressed, and the large pressure reaction force is not included in the load cell weighing weight. The error due to the pressure reaction force of the actual weight is eliminated, and the powder weight can be obtained with significantly higher precision than in the prior art.

Further, according to the present invention, by providing the pressure-balancing type expansion joint, the lock hopper having the large pressure reaction force as a support end on one side of the pressure-balancing type expansion joint is provided. Acting on the supporting gantry between the weighing hopper and the weighing hopper can be avoided, and the gantry can be prevented from being broken due to high stress caused by the pressure reaction force.

Further, according to the present invention, the displacement of the pressure-balancing type expansion joint is measured by the displacement detector, and the spring reaction force is calculated based on the measured value, so that the spring reaction force is accurately obtained. This makes it possible to measure the weight of high-temperature powder such as char with high accuracy.

According to a sixth aspect of the present invention, the spring reaction force of the pressure-balanced expansion joint is directly measured by a reaction force measuring load cell provided with a strain gauge. The reaction force can be determined more accurately, and the weight measurement of a high-temperature powder such as char can be performed with higher precision.

[0017] The invention according to claims 7 to 11 relates to a powder weight measuring device in which a plurality of weighing hoppers are arranged in parallel in an outlet passage of a powder container.
A plurality of powders such as pulverized coal and char (residue of combustion) stored in the powder container are arranged in parallel below the powder valve via a powder valve that opens and closes an outlet passage of the powder container. A plurality of pipes are guided to the weighing hopper through a plurality of pipes, and between the powder valve and each weighing hopper, an expansion joint communicated with each of the pipes is vertically supported. A gantry is provided, a part of the plurality of weighing hoppers is used and the others are put on standby, and the weight of the powder introduced into the weighing hopper is measured by a load cell provided in each of the weighing hoppers. In the powder weight measuring device configured to perform the above, each of the expansion joints provided above and below the gantry, the pressure inside the expansion joint is balanced, from the expansion joint to the gantry side Pressure-balanced expansion joint that prevents the action of pressure reaction force And it features.

According to an eighth aspect of the present invention, in accordance with the seventh aspect, two of the pressure-balancing expansion joints are interposed in series by inserting the gantry between the powder valve and each weighing hopper. It is characterized by having done. According to a ninth aspect of the present invention, in the seventh aspect, an airtight valve that enables the powder passage to be fluid-tightly closed in the powder passage between each of the pressure-balancing type expansion joints and each of the weighing hoppers. It is characterized by being interposed. According to a tenth aspect of the present invention, in the seventh aspect, a spring reaction force acting on the pressure-balanced expansion joint is measured by measuring a displacement between both ends of the pressure-balanced expansion joint. It is characterized in that a displacement detector for detecting is provided. According to an eleventh aspect of the present invention, in the seventh aspect, between the lower portion of each of the pressure-balancing type expansion joints and each of the weighing hoppers, a reaction force for measuring a reaction force acting downward from the pressure-balancing type expansion joints. The load cells for force measurement are arranged in series.

According to the invention of claims 7 to 11,
Similarly to the first to sixth aspects of the present invention, since the expansion joint on the inlet side of each weighing hopper is a pressure-balanced expansion joint in which pressure is balanced inside, the upper and lower end surfaces of the pressure-balanced expansion joint are used. Because the force acting on the powder line, that is, the pressure reaction force is not included in the load cell weighed weight,
Of the actual weight of the powder calculated from the weight of the load cell,
The error due to the large pressure reaction force is eliminated, and a significantly more accurate powder weight can be obtained as compared with the prior art. Further, by providing the pressure-balancing type expansion joint, it is possible to prevent such a large pressure reaction force from acting on a gantry serving as a support end on one side of each pressure-balancing type expansion joint. The gantry is prevented from being broken due to high stress caused by the reaction force.

According to a twelfth aspect of the present invention, powder such as pulverized coal or char (combustion residue) contained in a powder container is connected to two large-diameter and small-diameter pipes from the outlet of the powder container. And a supporting gantry between the powder container and the weighing hopper, in which expansion joints respectively connected to the two large-diameter and small-diameter pipes are vertically interposed. In the powder weight measuring device provided to measure the weight of the powder introduced into the weighing hopper by a load cell provided in the weighing hopper, the weighing hopper is provided above and below the gantry beam The expansion joint is constituted by a pressure-balanced expansion joint in which the pressure inside the expansion joint is balanced to prevent the action of a pressure reaction force from the expansion joint to the gantry beam side, and the small-diameter conduit is Horizontally connected to weighing hopper And it features.

According to this invention, the pressure reaction force and the spring reaction force in the axial direction of the weighing hopper are suppressed by the large-diameter and small-diameter pipe pressure-balancing expansion joints provided on the inlet side of the weighing hopper. By directing the small-diameter extraction pipe drawn out of the weighing hopper to the outside in the horizontal direction, the force reaction force and the spring reaction force acting in the axial direction by the small-diameter extraction pipe can be suppressed.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to an embodiment shown in the drawings. However, unless otherwise specified, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention thereto, but are merely illustrative examples. It's just

FIG. 1 shows a powder weight measuring apparatus according to a first embodiment of the present invention, wherein (A) is an overall configuration diagram, and (B) is a configuration diagram of a pressure-balanced expansion joint. FIG. 2 shows a second embodiment, and FIG.
4 shows a third embodiment, FIG. 4 shows a fourth embodiment, FIG. 5 shows a fifth embodiment,
6 is a sixth embodiment, FIG. 7 is a seventh embodiment, FIG. 8 is an eighth embodiment, FIG. 9 is a ninth embodiment, FIG. 10 is a tenth embodiment, and FIG.
Shows an eleventh embodiment, and FIG. 12 shows a twelfth embodiment. FIG.
1 is a configuration diagram of a coal gasifier including a powder weight measuring device according to the present invention.

In the first embodiment shown in FIG. 1, reference numeral 1 denotes a bin for accommodating the powder to be measured, and reference numeral 11 denotes a weighing hopper provided at the lowermost portion for measuring the weight of the powder. The pressure of the powder is set to 30 kg / c in a vertical powder line 023 connecting the bottle 1 and the weighing hopper 11.
lock hopper 7 for storing pressurized to m ² about high pressure is provided.

The powder line 023 is connected to the powder outlet of the bottle 1 and the powder outlet of the lock hopper 7.
Powder valves 2 and 2 for opening and closing 23 are provided. Also,
A supporting gantry 5 is interposed in the powder pipeline 023 between the bin 1 and the lock hopper 7, and extends and contracts between the upper and lower surfaces of each gantry 5 and the powder pipeline 023. A joint 3 is interposed. Further, the powder pipeline 023 is connected to the powder pipeline 023 between the expansion joint 3 and the lock hopper 7 and the lower powder pipeline 023 of the powder valve 2 at the outlet of the lock hopper 7. Airtight valves 6, 6 that can be closed tightly are provided respectively. Reference numeral 4 denotes a load cell for measuring the weight of the weighing hopper 11 in which the powder is stored. The above configuration is the same as that of the prior art shown in FIG.

In the present invention, the supporting gantry 5 is provided between the lock hopper 7 and the weighing hopper 11.
The expansion joint interposed between the upper and lower surfaces of the above and the powder pipeline 023 is improved. That is, in FIG. 1, reference numeral 10 denotes a pressure-balancing type expansion joint, which is provided between the upper and lower surfaces of a supporting gantry 5 provided between the airtight valve 6 and the weighing hopper 11 on the lock hopper 7 outlet side. They are respectively interposed between the powder pipes 023. The pressure-balanced expansion joint 10 is shown in FIG.
As shown in (B), two small diameter portions 10a, 10a are joined to both sides of the large diameter portion 10b, between the lower end surface of the large diameter portion 10b and the upper end surface of the upper small diameter portion 10a, and Stoppers 10c and 10c are interposed between the upper end surface of the large diameter portion 10b and the upper end surface of the lower small diameter portion 10a, respectively. Further, the cross-sectional area _{A 2} of the large diameter portion 10b is twice the cross-sectional area _{A 1} of the upper and lower small-diameter portion 10a and 10a, that is, configured to _A 2 = 2A _1.

When the powder weight is measured by the powder weight measuring device, the powder valve 2 and the airtight valve 6 on the upper side are used.
Is opened, the powder in the bin 1 is sent into the lock hopper 7, and then the upper airtight valve 6 is closed (at this time, the lower airtight valve 6 is closed). The pressure of the powder is increased to a high pressure of about 30 kg / cm ² . Next, the powder valve 2 at the outlet of the lock hopper 7 and the airtight valve 6 at the lower side are opened, and the high-pressure powder in the lock hopper 7 is sent into the weighing hopper 11 through the inside of the pressure-balanced expansion joint 10, The weight of the weighing hopper 11 is measured by the load cell 4. The high-pressure powder whose weight has been measured is extracted from the weighing hopper 11 and sent to a coal gasifier.

At the time of measuring the powder weight, 30 kg / cm ² is contained in the powder conduit 023 and the expansion joint 3 between the lock hopper 7 and the weighing hopper 11.
Since the high-pressure powder that has been pressed to a certain degree passes through the conventional powder weighing device as shown in FIG. 14, the pressure reaction force due to the internal pressure in the expansion joint 3 (see FIG. 14) and the expansion joint 3 is measured by the load cell 4. However, according to this embodiment, the conventional expansion joint 3
Instead of the pressure-balanced expansion joint 10 (see FIG. 14),
As described below, the pressure reaction force is balanced and does not add to the weight of the load cell as shown below.

That is, in the pressure balanced type expansion joint 10,
The internal pressure of the weighing hopper 11, ie, the pressure balanced type.
Set the internal pressure of the expansion joint 10 to P₀Then, as described above, the pressure
Cross-sectional area A of large diameter portion 10b of balanced expansion joint 10₂Is before
The cross-sectional area A of the upper and lower small diameter portions 10a and 10a₁
Twice, that is, A₂= 2A₁Is configured in the above,
Upper and lower sides of the upper and lower small diameter portions 10a and 10a
Direction force F₁₁= P ₀・ A₁  The vertical force F applied to the large diameter portion 10b₁₂= P₀・ (A
₂-A₁) = P₀・ A ₁  Therefore, F₁₁= F₁₂And the pressure-balanced telescopic joint
The upper and lower end faces 10d and 10d of the hand 10 are in the expansion joint 10
Internal pressure P₀The pressure reaction force F₁I'm hanging
No.

Therefore, in this embodiment, the total
The actual weight W of the powder stored in the quantity hopper 11 is
Thus, the pressure reaction force F₁= 0, so in the following equation (2)
Is calculated. First, the load cell weight W₁Is W₁= W₂+ W + F₂  Therefore, the actual weight W of the powder is: W = W₁− (W₂+ F₂(2) where W₂: Weight of weighing hopper 11 F₂: Spring reaction force of expansion joint 3 (hereinafter referred to as spring reaction force)

As described above, according to this embodiment, the expansion joint on the outlet side of the lock hopper 7 through which the high-pressure powder passes is the pressure-balanced expansion joint 10 in which the pressure is balanced inside. Upper and lower end surfaces 1 of the mold expansion joint 10
0d, force or the pressure reaction force _{F 1} applied from 10d to the powder conduit 023 0 (zero), and thus large pressure reaction force _{F 1} (as described above, about 10000kg or more load) take the load cell weighing since that would not be included in the weight W _1, eliminated errors the due to a large pressure reaction force F ₁ of the actual weight W of the powder is calculated from the load cell weighing weight W _1, as compared with the prior art, considerably higher Accurate powder weight can be obtained.

Further, according to the embodiment, by providing the pressure balanced type expansion joint 10, large pressure reaction force F ₁ as described above is a support end of one side of the pressure balanced type expansion joint 10 and the lock hopper 7 has to act on the frame beam 5 between the metering hopper 11 is avoided, in the cross Taihari 5, occurrence of breaking by a high stress due to the pressure reaction force F ₁ can be prevented You.

FIG. 2 shows a second embodiment of the present invention. In this embodiment, the lower airtight valve 6 provided between the lock hopper 7 outlet side and the pressure balanced expansion joint 10 in the first embodiment (FIG. 1) is replaced with a pressure balanced expansion joint 10. And the weighing hopper 11. Other configurations are the same as those of the first embodiment, and the same members are denoted by the same reference numerals.

In the second embodiment, the internal pressure of the expansion joint 10 including the pressure fluctuation of the lock hopper 7 is changed from the pressure equalization expansion joint 10 to the weighing hopper 11 by the pressure equalizing expansion joint 10. Therefore, the lower airtight valve 6 can be provided on the weighing hopper 11 away from the lock hopper 7 outlet side. Thereby, the pressure balanced type expansion joint 10 can be maintained at a normal pressure level, and the maintainability is improved.

FIG. 3 shows a third embodiment of the present invention. In this embodiment, in the first embodiment shown in FIG.
The pressure-balanced expansion joint 10 is provided with a displacement gauge 16 for measuring the displacement of the expansion joint in the longitudinal direction. Char is supplied from the cyclone 15 as powder for weight measurement. The displacement x of the pressure-balanced expansion joint 10 measured by the displacement meter 16 and the pressure-balanced expansion joint 10
The spring reaction force F ₂ is calculated by the following equation: F ₂ = K · x (3) Other configurations are the same as those of the first embodiment, and the same members are denoted by the same reference numerals.

When measuring the weight of the powder comprising the char (combustion residue), the temperature of the char is as high as about 400 ° C., so that the pressure-balanced expansion joint 10 undergoes thermal expansion, spring reaction _{F 2} increases. In measuring the weight of the for such char, the spring requires that the reaction force F ₂ to accurately detect, but the spring reaction force F ₂ in the first and second embodiments, the operation including estimating It is difficult to obtain sufficiently high measurement accuracy when measuring the powder weight of such a char. However, in the third embodiment, the displacement x of the pressure-balanced expansion joint 10 is measured by the displacement gauge 16, and the displacement (x) is determined based on the measured value.
Since calculating the spring reaction force F ₂ by a formula, it is possible to determine the spring reaction force F ₂ can be accurately perform weight measurement of the hot powder such as char at high accuracy.

FIG. 4 shows a fourth embodiment of the present invention. In this embodiment, in the second embodiment shown in FIG. 2, that is, in a case where the lower airtight valve 6 is moved between the pressure-balancing type expansion joint 10 and the weighing hopper 11, the pressure-balancing type expansion joint is 10 is provided with a displacement meter 16 for measuring the displacement of the expansion joint 10 in the longitudinal direction. The operation and effect of this embodiment are the same as those of the third embodiment. Other configurations are the same as those of the third embodiment, and the same members are denoted by the same reference numerals.

FIG. 5 shows a fifth embodiment of the present invention. In this embodiment, in addition to the first embodiment, a load cell 17 provided with a strain gauge is provided below the pressure-balanced expansion joint 10, and the spring reaction force of the pressure-balanced expansion joint 10 is provided by the load cell 17. measures the F ₂ directly. When measuring the powder weight of the char, a cyclone 15 similar to that shown in FIGS. 3 and 4 is used instead of the bottle 1 shown in FIG. Other configurations are the same as those of the first embodiment, and the same members are denoted by the same reference numerals.

In the fifth embodiment, the pressure-balanced expansion joint 1 is provided by a load cell 17 having a strain gauge.
Since 0 of the spring reaction force F ₂ is directly measured, the third,
4 more accurately it can be determined the spring reaction force F ₂ than Example, it is possible to perform drives out weight measurement of high-temperature powder, such as char at further high accuracy.

FIG. 6 shows a sixth embodiment of the present invention. In this embodiment, in the second embodiment shown in FIG. 2, that is, in a case where the lower airtight valve 6 is moved between the pressure-balancing type expansion joint 10 and the weighing hopper 11, the pressure-balancing type expansion joint is Load cell 1 with a strain gauge below 10
7 is provided, which measures the spring reaction force F ₂ of the pressure balanced type expansion joint 10 at the load cell 17 directly. In measuring the powder weight of the char, a cyclone 15 similar to that shown in FIGS. 3 and 4 is used instead of the bottle 1 shown in FIG. The operation and effect of this embodiment are the same as those of the fifth embodiment. Other configurations are the same as those of the third embodiment, and the same members are denoted by the same reference numerals.

FIG. 7 shows a seventh embodiment of the present invention. In this embodiment, a plurality of weighing hoppers 11 are installed in parallel, and a plurality of powder pipelines 23 connected to each weighing hopper 11 through the upper gantry 5 from the bin 1 installed above.
The pressure-balancing type expansion joint 10 is interposed in the middle of each of the powder pipes 23 and supported on the upper and lower surfaces of the gantry 5. 2 is a powder valve for opening and closing the powder outlet of the bottle 1;
Is an airtight valve provided between the pressure-balancing type expansion joint 10 and the weighing hopper 11 to open and close the powder conduit 23 therebetween, and 4 is a load cell for measuring the weight of the weighing hopper 11. .

In the seventh embodiment, with respect to one (or more than two) of the plurality of weighing hoppers 11, the powder valve 2 and the airtight valve 6 are opened and the The powder is introduced through the expansion joint 23 and the pressure-balancing type expansion joint 10 to measure the weight of the powder, and the other one (or two or more) is closed by closing the powder valve 2 and the airtight valve 6. When the reception of the weighing hopper 11 performing the measurement decreases, the weighing hopper 11 in the standby state is switched to be used.

In this embodiment as well, as in the first to seventh embodiments, the expansion joint on the inlet side of each weighing hopper 11 is a pressure-balanced expansion joint 10 in which pressure is balanced inside. a force that is, the pressure reaction force F ₁ from the upper and lower end surfaces acting on the powder conduit 23 of the pressure balance type expansion joint 10 is not included in the load cell weighing weight W _1, is calculated from the load cell weighing weight the actual weight of the powder, the eliminated error due to a large pressure reaction force F _1, it is possible to obtain a powder weight of significantly high accuracy compared to the prior art.

[0044] Further, by providing the pressure balanced type expansion joint 10, acting in a supporting end of one side frame beams 5 of the large pressure reaction force F ₁ is the pressure balanced type expansion joint 10, such as the It is avoided for the occurrence of the destruction of the cross Taihari 5 by high stresses due to the pressure reaction force F ₁ can be prevented.

FIG. 8 shows an eighth embodiment of the present invention. In this embodiment, the expansion joint on the upper surface side of the gantry 5 in the seventh embodiment is configured as follows. That is, the expansion joint on the upper surface side of the gantry 5 is a bellows 24 having the same diameter.
a and 24a are communicated with each other by a conduit 24c, a stopper 24b is interposed between both end surfaces of the bellows 24a and 24a, and the powder conduit 23 is provided in the middle of the conduit 24c.
Are connected to each other to form a pressure-balanced expansion joint 24. The pressure-balanced expansion joint 24 applies opposite pressures and the same pressure reaction to both end surfaces of the bellows 24a, 24a by the internal pressures of the bellows 24a, 24a having the same diameter. Because it is restrained,
The force due to the internal pressure is balanced, and the pressure reaction force can be set to 0 (zero) as in the pressure balanced expansion joint 10 in the first to eighth embodiments.

FIG. 9 shows a ninth embodiment of the present invention. In this embodiment, each of the pressure-balancing type expansion joints 10 in the seventh embodiment is provided with a displacement meter 1 for measuring the longitudinal displacement of the expansion joint 10 similar to the third or fourth embodiment.
6 are provided. Other configurations are the same as those of the seventh embodiment, and the same members are denoted by the same reference numerals. Also in such an embodiment, by measuring the displacement x of the pressure balanced type expansion joint 10 by the third to fourth embodiments and similar displacement gauge 16, since the calculated spring reaction force F ₂ on the basis of this measured value, the expansion joint 10 spring reaction force F ₂ to can be accurately determined, it is possible to perform weight measurement of the hot powder such as char at high accuracy.

FIG. 10 shows a tenth embodiment of the present invention. In this embodiment, a load cell 17 having a strain gauge is provided below the pressure-balanced expansion joint 10 in the seventh embodiment, similarly to the fifth to sixth embodiments. Each of the pressure balanced type expansion joints 1
0 of the spring reaction force F ₂ is directly measured. Other configurations are the same as those of the seventh embodiment, and the same members are denoted by the same reference numerals.

[0048] In such embodiment, similarly to the fifth to the sixth embodiment, since the measuring spring reaction force F ₂ of the pressure balanced type expansion joint 10 directly by the load cell 17 having strain gauges, the than third and fourth embodiment more precisely it can be determined the spring reaction force F _2, it is possible to perform drives out weight measurement of high-temperature powder, such as char at further high accuracy.

FIG. 11 shows an eleventh embodiment of the present invention. In this embodiment, a large-diameter pipe 25a for supplying powder for weight measurement similar to the powder pipe 023 in the first embodiment is provided at the inlet side of the weighing hopper 11; The small-diameter pipe 25b is connected, and the large-diameter pipe 25a and the small-diameter pipe 25b are respectively connected to the pressure-balanced expansion joint similar to the first embodiment, that is, the large-diameter pressure-balanced expansion joint 010a and the small-diameter pressure-balanced expansion joint. 010b and the large diameter pressure balanced type expansion joint 010a and the small diameter pressure balanced type expansion joint 0
Airtight valves 6a and 6b are provided between 10b and the weighing hopper 11, and a small-diameter extraction pipe 26 that is drawn out of the weighing hopper 11 to the outside is configured to be oriented in the horizontal direction. Reference numeral 24 denotes a flexible joint provided on each of the small-diameter extraction pipes 26.

In the eleventh embodiment, the large-diameter pressure-balanced expansion joint 010a and the small-diameter pressure-balanced expansion joint 010b provided on the inlet side of the weighing hopper 11 are described.
By suppressing the pressure reaction force and the spring reaction force of the weighing hopper 11 in the axial direction, the small-diameter discharge pipe 26 drawn out of the weighing hopper 11 is directed in the horizontal direction. The force reaction force and the spring reaction force acting in the axial direction can be suppressed by 26.

FIG. 12 shows a twelfth embodiment of the present invention. In this embodiment, the airtight valves 6a and 6b in the eleventh embodiment are provided on the inlet side of the large-diameter pressure-balanced expansion joint 010a and the small-diameter pressure-balanced expansion joint 010b. The operation and effect of this embodiment are the same as those of the eleventh embodiment. Other configurations are the same as those of the eleventh embodiment, and the same members are denoted by the same reference numerals.

FIG. 13 shows a powder weighing apparatus 201 for pulverized coal similar to that of the first embodiment and a powder weighing apparatus 202 for char similar to that of the third embodiment. 100, the powder weights of the pulverized coal and char supplied to the gasification furnace 100 can be measured in parallel. In the figure, 101 is a filter for char, 1
02 is a pulverized coal supply pipe, 103 is a char supply pipe, and 104 and 105 are char pipes. Other members are denoted by the same reference numerals as in the first and third embodiments.

[0053]

As described above, according to the present invention, since the expansion joint through which the high-pressure powder passes is a pressure-balanced expansion joint in which pressure is balanced inside, the upper and lower end surfaces of the pressure-balanced expansion joint are provided. Therefore, the force acting on the powder pipeline, that is, the pressure reaction force is suppressed, and the large pressure reaction force is not included in the load cell weighed weight. The measurement error due to the pressure reaction force is eliminated, and the measurement accuracy of the powder weight can be greatly improved as compared with the related art.

Further, according to the present invention, by providing the pressure-balancing type expansion joint, the above-mentioned lock hopper, which has a large pressure reaction force as a support end on one side of the pressure-balancing type expansion joint, is provided. Acting on the supporting gantry between the weighing hopper and the weighing hopper can be avoided, and the gantry can be prevented from being broken due to high stress caused by the pressure reaction force.

According to the fifth and tenth aspects, the displacement of the pressure-balanced expansion joint is measured by the displacement detector, and the spring reaction force is calculated based on the measured value. And the weight of a high-temperature powder such as char can be measured with high accuracy. Further, according to the sixth and eleventh aspects, the spring reaction force of the pressure-balancing type expansion joint is directly measured by the reaction force measurement load cell provided with the strain gauge.
The spring reaction force can be obtained more accurately than that of the case of zero, and the weight measurement of a high-temperature powder such as char can be performed with higher precision.

In summary, according to the present invention, the measurement error of the powder weight due to the pressure reaction force in the expansion joint through which the high-pressure powder passes can be suppressed, and the measurement accuracy of the powder weight can be greatly improved. It is possible to provide a powder weight measuring device in which the acting load of the gantry due to the pressure reaction force is reduced, and the gantry is prevented from breaking due to high stress.

[Brief description of the drawings]

FIG. 1 shows a powder weight measuring device according to a first embodiment of the present invention, in which (A) is an overall configuration diagram and (B) is a configuration diagram of a pressure-balanced expansion joint.

FIG. 2 is a view corresponding to FIG. 1 showing a second embodiment.

FIG. 3 is a view corresponding to FIG. 1 showing a third embodiment.

FIG. 4 is a view corresponding to FIG. 1 showing a fourth embodiment.

FIG. 5 is a view corresponding to FIG. 1, showing a fifth embodiment.

FIG. 6 is a view corresponding to FIG. 1 showing a sixth embodiment.

FIG. 7 is a view corresponding to FIG. 1, showing a seventh embodiment.

FIG. 8 is a view corresponding to FIG. 1, showing an eighth embodiment.

FIG. 9 is a view corresponding to FIG. 1, showing a ninth embodiment.

FIG. 10 is a view corresponding to FIG. 1, showing a tenth embodiment.

FIG. 11 is a view corresponding to FIG. 1, showing an eleventh embodiment.

FIG. 12 is a view corresponding to FIG. 1, showing a twelfth embodiment.

FIG. 13 is a configuration diagram of a coal gasifier including a powder weight measuring device according to the present invention.

FIG. 14 is a view corresponding to FIG. 1 showing a first example of a conventional technique of a powder weight measuring device.

FIG. 15 is a view corresponding to FIG. 1 showing a second example of the prior art of the powder weight measuring device.

FIG. 16 is a diagram showing a relationship between the diameter of an expansion joint and the pressure reaction force in the powder weight measuring device.

FIG. 17 is a diagram showing the relationship between the displacement of an expansion joint and the spring reaction force in the powder weight measuring device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 bin 2 powder valve 3 expansion joint 4 load cell 5 gantry 6 airtight valve 7 lock hopper 10 pressure balanced expansion joint 10a small diameter section 10b large diameter section 10c stopper 010a large diameter pressure balanced expansion joint 010b small diameter pressure balanced expansion joint DESCRIPTION OF SYMBOLS 11 Measuring hopper 15 Cyclone 16 Displacement meter 17 Load cell 23,023 Powder pipeline 26 Small diameter extraction pipe 100 Gasifier

Claims (12)

[Claims] 1. A pulverized coal and a char stored in a powder container
The pressure of the powder such as (combustion residue) is increased by a lock hopper connected to a pipe from the outlet of the powder container, and the powder valve passes through a powder valve that opens and closes an outlet pipe of the lock hopper. Guide to a weighing hopper disposed below, and a supporting gantry provided with an expansion joint vertically communicated with the lock hopper between the powder valve and the weighing hopper, In a powder weight measuring device configured to measure the weight of the powder introduced into the weighing hopper by a load cell provided in the weighing hopper, the expansion joints provided above and below the gantry beam are provided. And a pressure-balanced expansion joint that balances the pressure inside the expansion joint and prevents the action of a pressure reaction force from the expansion joint on the gantry side. 2. The powder according to claim 1, wherein two of the pressure-balancing expansion joints are interposed in series with the gantry inserted between the powder valve and the weighing hopper. Weight measuring device. 3. An airtight valve for closing the powder passage in a fluid-tight manner is provided in the powder passage between the powder valve and the pressure-balancing expansion joint. The powder weight measuring device according to the above. 4. The powder weight according to claim 1, wherein an airtight valve is provided between the pressure-balancing expansion joint and the weighing hopper so that the powder passage can be closed in a fluid-tight manner. Measuring device. 5. A displacement detector for measuring a displacement between both ends of the pressure-balanced expansion joint and detecting a spring reaction force acting on the pressure-balanced expansion joint, wherein the pressure-balanced expansion joint is provided. The powder weight measuring device according to claim 1, wherein: 6. A reaction force measurement load cell for measuring a reaction force acting downward from the pressure-balanced expansion joint between the lower part of the pressure-balanced expansion joint and the weighing hopper. The powder weight measuring device according to claim 1, wherein: 7. Pulverized coal and char stored in a powder container
Powder such as (combustion residue) is passed through a plurality of pipes to a plurality of measuring hoppers arranged in parallel below the powder valve via a powder valve for opening and closing the outlet passage of the powder container. Guide and
Between the powder valve and each of the weighing hoppers, a supporting gantry beam in which an expansion joint communicated with each of the pipelines is vertically interposed is provided, and a part of the plurality of weighing hoppers is provided. In a powder weight measuring device configured to use and wait for others and measure the weight of the powder introduced into the weighing hoppers by a load cell provided in each of the weighing hoppers, Each of the plurality of expansion joints provided above and below the expansion joint is a pressure-balanced expansion joint that balances the pressure inside the expansion joint and prevents the action of a pressure reaction force from the expansion joint to the gantry beam side. A powder weight measuring device characterized by comprising. 8. The pressure equalizing type expansion joint according to claim 7, wherein two of said mounting beams are inserted in series between said powder valve and each of said weighing hoppers. Powder weight measuring device. 9. An airtight valve for closing the powder passage in a fluid-tight manner is interposed in the powder passage between each of the pressure-balancing type expansion joints and each of the weighing hoppers. The powder weight measuring device according to claim 7. 10. Each of the pressure-balanced expansion joints is provided with a displacement detector for measuring a displacement between both ends of the pressure-balanced expansion joint and detecting a spring reaction force acting on the pressure-balanced expansion joint. The powder weight measuring device according to claim 7, wherein: 11. A reaction force measurement load cell for measuring a reaction force acting downward from the pressure balanced type expansion joint between the lower part of each pressure balanced expansion joint and each weighing hopper, respectively. The powder weight measuring device according to claim 7, wherein the powder weight measuring device is arranged. 12. Powder such as pulverized coal and char (combustion residue) stored in a powder container is transferred to a weighing hopper connected to two large-diameter and small-diameter pipes from an outlet of the powder container. A supporting gantry between the powder container and the weighing hopper, the supporting gantry being provided with upper and lower expansion joints communicating with the two large-diameter and small-diameter pipes, respectively. In a powder weight measuring device configured to measure the weight of the powder introduced into the weighing hopper by a load cell provided in the weighing hopper, the expansion joints provided above and below the gantry beam are expanded and contracted. A pressure-balanced expansion joint that balances the pressure inside the joint and prevents the action of a pressure reaction force from the expansion joint to the gantry beam side, and the small-diameter pipe is horizontally connected to the weighing hopper. Powder weighing machine characterized by being connected to Apparatus.