JPH09101016A - Distributing and supplying device for powder and grain - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a stable supply of pulverized coal toward rear stream side by a method wherein a pressurized supplying hopper and a fluidized tank type airstream distributor are communicated with a stand pipe through a rotary feeder while the upper end unit of the stand pipe is communicated with the upper end unit of the pressurized supplying hopper through an equilibrium tube. SOLUTION: A rotary feeder 7 is interposed at the lower part of a pressurized supplying hopper 3 and a fluidized tank type airstream distributor 13, communicated through a stand pipe 20 extending vertically below the rotary feeder 7, is provided. The fluidized tank type airstream distributor 13 is called also as a blow tank and is provided with a fluxopump type especially while a plurality of pieces of transfer pipes are provided. The upper end unit of the sand pipe 20 is communicated with the upper end unit of the pressurized supplying hopper 3 with a pressure equilibrium pipe 17 from a part immediately below the rotary feeder. In this case, the pulverized coal 19 is filled from the stand pipe 20 to a fluidized tank type airstream distributor 13 while the amount of the pulverized coal, corresponding to a reduced amount due to transferring, is supplied from the pressurized supplying hopper 3 by a rotary feeder 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

FIELD OF THE INVENTION The present invention relates to a dry fuel supply system for a spouted bed gasifier.

[0002]

2. Description of the Related Art A conventional device will be described with reference to FIG.

From the upper part to the lower part, the normal pressure bottles 1,
The lock hopper 2 and the pressurizing supply hopper 3 are arranged, and for these containers, a conveyor 4, a valve body 5 combining a powder cut-out valve and an air valve, and another valve body having the same function as the valve body 5. 6 and the rotary feeder 7 are incorporated, and the structure of the central portion is completed.

Each container is connected by a pressure equalizing line 26, and the pressure equalizing line 26 is exclusively used between the pressure supply hopper 3 and the lock hopper 2 and between the lock hopper 2 and the atmospheric pressure bin 1. Shut-off valves 8 and 9 are provided. When the shutoff valves 8 and 9 are simultaneously opened, the depressurized gas is exhausted to the bag filter 10.

On the other hand, in order to pressurize the lock hopper 2,
A line 11a for exclusive use of pressurization is provided from the N ₂ source 11, and pressurization is performed by opening the shut-off valve 12 interposed in the middle.

The pressure supply hopper 3 also serves as the flow tank type airflow distributor 13, and the same flow tank type airflow distributor 13 is used.
The pulverized coal 19 is supplied from the N ₂ source 11 to the N ₂ gas supply pipe 1
Led through 6 to N ₂ gas distribution plate 15 made of sintered multilayer metal mesh, N ₂ gas introduced through the hand, when flowing into the transport pipe 14, is transported becomes the N ₂ gas and Ichisho .

At this time, the carrier pipe 14 is operated while being fully immersed in the pulverized coal 19.

Therefore, when the level of the pulverized coal 19 in the pressure supply hopper 3 is lowered, the pulverized coal 19 is added from the upper lock hopper 2 while the carrier pipe 14 is immersed in the pulverized coal layer so as to receive it. Has become.

The total flow rate of the pulverized coal 19 transported by the carrier pipe 14 can be usually calculated from the reduction of the load cell 22 of the pressurizing supply hopper 3, but is calculated when the pulverized coal 19 is additionally received as described above. become unable.

The above-mentioned fluid tank type air flow distributor 13
Among those commonly called blow tanks,
The mechanism is the same as that of a flux saw pump, and the one shown here has a plurality of carrier pipes 14 instead of one, and transports the pulverized coal 19 as a transport product to the pressurized gasification furnace 23. It is designed to be performed continuously instead of batch.

[0011]

In the above-mentioned conventional one, the hopper 3 for pressurizing and supplying the pulverized coal 19 from the lock hopper 2 is used.
During receiving in the combined flow tank type air flow distributor 13, pulverized coal 1
Since the inflow of 9 is large and the inflow is large, the impact force when it falls on the surface of the pulverized coal layer that has previously flown into the pressurized supply hopper 3 is large, and it is sent to the transfer pipe 14 by the flow of N ₂ gas. Since the flow rate of the pulverized coal that is generated is changed only during this period, there is a risk that the quantified and stable supply of the pulverized coal 19 to the pressurized gasification furnace 23 may be disturbed during this period.

An object of the present invention is to solve the above-mentioned problems of the conventional ones and to obtain a product with further improved operational stability.

[0013]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and a flow tank type air flow distributor is independently installed below the pressure supply hopper, and the pressure supply hopper and The flow tank type air flow distributor is connected by a stand pipe via a rotary feeder, and the upper and lower ends of the stand pipe at the bottom of the rotary feeder and the upper end of a pressure supply hopper are connected by a pressure equalizing pipe for distribution and supply of particles. The pulverized coal from the pressure supply hopper is sent through the rotary feeder so as to fill the stand pipe and then to the fluidized tank type air flow distributor. Does not transmit a defective force such as an impact force generated when the pulverized coal is supplied in the pressure hopper.

Moreover, since the upper end of the stand pipe and the upper end of the hopper are communicated with each other by the pressure equalizing pipe, the bubbles generated in the pulverized coal bed are collected through the pressure equalizing pipe into the pressure supply hopper, and the fine powder is contained in the stand pipe. Reliably fills the coal, further improving the stability of pulverized coal supply.

Further, according to the present invention, a differential pressure gauge is provided between the upper portion of the pressure supply hopper and the upper portion of the flow tank type air flow distributor, and a control circuit for controlling the rotation of the rotary feeder by the signal of the differential pressure gauge. To provide a powder and granular material distribution and supply device, and to control the actual condition of the existence of pulverized coal in both the pressurized supply hopper and the fluidized tank type air flow distributor on the supply side and the reception side of the pulverized coal as a medium. By controlling the rotation of the rotary feeder that directly controls the supply of pulverized coal, the reliability and stability of the pulverized coal supply can be further enhanced.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described with reference to FIG. In the figure, the parts common to the above-mentioned conventional ones are denoted by common reference numerals so as to facilitate mutual understanding.

Reference numeral 1 is a normal pressure bottle, 2 is a lock hopper, and 3 is a pressure supply hopper, and these containers are arranged in this order from the upper part to the lower part in the vertical direction. Reference numeral 4 is a conveyor, 5 is a valve body in which a powder cut-out valve and an air valve are combined, 6 is another valve body having the same function as the valve body 5, and 7 is a rotary feeder.

Reference numeral 26 is a pressure equalizing line, which connects the respective containers of the normal pressure bottle 1, the lock hopper 2, and the pressure supply hopper 3, and the exclusive shut-off valves 8 and 9 are interposed between the respective containers. ing. If the shutoff valves 8 and 9 are simultaneously opened here, the depressurized gas is exhausted to the bag filter 10.

On the other hand, the lock hopper 2 is connected to the N ₂ source 11 through a dedicated pressurizing line 11a having a shutoff valve 12 interposed therein, and the shutoff valve 12 is opened for pressurization.

In addition to the above construction, the pressure supply hopper 3
A fluid tank type airflow distributor 13 which is connected to a vertically extending stand pipe 20 with a rotary feeder 7 interposed therebetween is provided below the. This fluid tank type airflow distributor 13 is also called a blow tank, and is a flaxo pump type and is provided with a plurality of carrier pipes.

The upper end of the stand pipe 20 is connected to the upper end of the pressure supply hopper 3 by a pressure equalizing pipe 7 from just below the rotary feeder.

[0022] is a flow meter 24 and controls the flow rate control valve 25, N ₂ from the gas supply pipe 16 through the gas distribution plate 15 made of sintered wire mesh fluidized bed type air flow divider 13 N ₂ supplied to the The gas flows into the plurality of transfer pipes 14 with the pulverized coal 19 in the vicinity as one, and transfers the pulverized coal 19 to the pressurized gasification furnace 23.

The pulverized coal 19 is used in the stand pipe 20.
From the pressure supply hopper 3 to the flow tank type air flow distributor 13 and the rotary feeder 7 supplies the reduced amount due to the conveyance.

[0024] While the volume corresponding to the decrease amount of the pulverized coal 19 before it is replaced with N ₂ gas, the substituted N ₂ gas within the layers of the pulverized coal 19, rises as bubbles 21, standpipe From 20 to the pressure supply hopper 3 through the pressure equalizing pipe 17.

When the bubbles 21 rise, the differential pressure gauge 18 changes in proportion to the height of the pulverized coal layer. Therefore, this change value is applied as a signal to the control circuit 30 to rotate the rotary feeder 7 from the control circuit 30. By controlling so as to increase the number, the amount of pulverized coal 19 supplied from the pressure supply hopper 3 is increased, the amount of the pulverized coal 19 in the stand pipe 20 is kept constant, and the pulverized coal conveyed from the conveying pipe 14 is conveyed. The flow rate of the charcoal 19 is varied so that it does not fluctuate.

The differential pressure gauge 18 includes a stand pipe 20.
When the bubble 21 rises inside, the gas flow in the bubble 21 operates by causing a pressure loss. Control circuit 30
Sets in advance how much the time constant of the rotary feeder 7 should be increased according to the rate of change of this pressure change per hour, receives the output of the differential pressure gauge 7 and finds out this set value. The rotation speed command is fed back to the feeder 7.

Further, the total supply flow rate of the pulverized coal 19 can be measured by the load cell transmitter 22 which measures each of the pressurized supply hoppers 3.

As described above, according to the present embodiment, since the pressure supply hopper 3 and the flow tank type air flow distributor 13 are individually separated and separated by interposing the rotary feeder 7, the lock hopper 2 is provided. Pulverized coal 19 from pressurized feed hopper 3
The impact force generated when it is sent to the flow tank type air flow distributor 13
Pulverized coal 19 in the pressure supply hopper 3 without being transmitted to the
Is regularly and reliably sent to the fluidized tank type airflow distributor 13 through the rotary feeder 7 and the stand pipe 20, so that the flow rate of the pulverized coal 19 transported by the plurality of transfer pipes 14 is stabilized, and thus the pressurized gasification furnace The pulverized coal 19 can be continuously and stably supplied to 23.

Although the present invention has been described above with reference to the illustrated embodiments, the present invention is not limited to such embodiments.
It goes without saying that various modifications may be made to the specific structure within the scope of the present invention.

[0030]

As described above, according to the present invention, since the fluidized tank type air flow distributor and the pressure supply hopper are separately provided with the rotary feeder interposed therebetween, the pulverized coal is supplied to the pressure supply hopper from the upstream side thereof. The drop impact force at the time of receiving is not transmitted to the fluidized tank type airflow distributor, and there is no fluctuation in the flow rate of the pulverized coal sent from the same fluidized tank type airflow distributor to the downstream side, and stable transportation is performed in a fixed amount. I was able to do it.

Further, since the pulverized coal from the pressure supply hopper is cut out by the rotary feeder so that the stand pipe is always filled, the reduction of the pulverized coal in the pressure supply hopper is finally further reduced from the fluidized tank type air flow distributor. The amount of pulverized coal sent to the downstream side is almost the same, and the stability of the flow of the pulverized coal throughout the distribution route is maintained.

The bubbles rising up the stand pipe are
Since it is guided to the pressure supply hopper via the pressure equalizing pipe and bypasses the rotary feeder, air bubbles are directed to the rotary feeder, which obstructs the pulverized coal discharge by the rotary feeder and reduces the same amount. Without a doubt, it contributes to maintaining a stable pulverized coal flow path.

Furthermore, according to the second aspect of the present invention, by providing a differential pressure gauge between the pressure supply hopper and the flow tank type air flow distributor, it is possible to reduce the filling of the pulverized coal in the stand pipe. Since it can be known, the rotation speed of the rotary feeder is corrected by the command from the control circuit corresponding to this change, the discharge of pulverized coal to the stand pipe is increased, and the stand pipe is immediately returned to the full state. Thus, the stability of the flow of pulverized coal is ensured over the entire route.

[Brief description of the drawings]

FIG. 1 is a system diagram showing one embodiment of the present invention.

FIG. 2 is a system diagram showing a conventional one.

[Explanation of symbols]

 3 Pressurized Supply Hopper 7 Rotary Feeder 13 Flow Tank Type Air Flow Distributor 17 Pressure Equalizing Tube 18 Differential Pressure Meter 19 Pulverized Coal 20 Stand Pipe 30 Control Circuit

Claims (2)

[Claims] 1. A flow tank type airflow distributor is independently installed below the pressure supply hopper, and the pressure supply hopper and the fluid tank airflow distributor are connected by a stand pipe via a rotary feeder, A powder / granule distribution and supply device, characterized in that the upper end of a stand pipe at the bottom of the rotary feeder and the upper end of a pressure supply hopper are connected by a pressure equalizing pipe. 2. A differential pressure gauge is provided between an upper portion of the pressure supply hopper and an upper portion of the flow tank type air flow distributor, and a control circuit for controlling rotation of the rotary feeder by a signal of the differential pressure gauge is provided. The distribution and supply device for powdery or granular material according to claim 1.