JPS5874429A - Distributive pneumatic transportation device of granule - Google Patents

Abstract

PURPOSE:To easily and surely detect a blocked condition of a transport pipe, in case of supplying pulverized coal to a blast furnace from a pressure vessel, by constituting a device insuch a manner that a pressure difference in each transport pipe is detected and the blocked condition of the transport pipe is also detected. CONSTITUTION:Pressurized gas is upplied to a fluidizing bed 3 in a pressure tank 1 filled with granules, through a pressure regulator valve 5, and the pressure of the gas is increased to prescribed valve, then main valves VB1-VBN are opened to transport the granules in the tank 1 through transport pipes T1- TN. Pressure differences DELTAP1-DELTAPN of the granules in the transport pipes T1- TN are detected by pressure difference regulators DELTAPC1-DELTAPCN. This pressure difference, in accordance with flow start quantity of the grounles at a steady state, if at least a prescribed decrease is caused, a bloked condition of the transport pipes T1-TN is decided and both an alarm are given and displayed. In this constitution, the blocked condition can be easily and surely detected.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a granular material distributing gas transport device that connects a plurality of transport pipes to one pressurized tank and distributes and transports granular material in the pressurized tank.

Generally, in gas transportation equipment for powder and granular materials, when the powder and granular material is transported through the transport pipe, the powder and granular material adheres to the inner wall of the transport pipe, decreases in flow velocity, transports at a high solid-air ratio, and other causes. A phenomenon occurs in which the transport pipe becomes clogged and the transport pipe is blocked. Particularly in a transportation system that transports fuel-based powder such as pulverized coal or coke to a combustion device such as a blast furnace or a converter, interruption of the transportation system causes loss of load balance and causes great damage to the combustion device.

For this reason, it has conventionally been proposed to detect a closed or blocked state of a transport pipe by detecting the pressure in a pressurized tank and detecting the blockage of the transport pipe based on the increase in pressure.

According to this method, if one transport pipe is connected to one pressurized tank, the pressure inside the pressurized tank will rise sharply from the steady state due to blockage of the transport pipe, and this will easily cause Although it is possible to detect a blockage state, if multiple transport pipes are connected to one pressurized tank,
Detection cannot be easily and reliably performed. In other words, when a large number of transport pipes are blocked at the same time, the pressure inside the pressurized tank increases and the blockage can be detected, but when a small number of transport pipes are blocked, the transport gas from the transport gas supply pipe connected to the transport pipes is blocked. Even if there is a backflow into the pressurized tank, the transported gas will escape to the outside through other transport pipes that are normally being transported, so the pressure inside the pressurized tank will not noticeably increase and detection of a blockage will be delayed. The powder and granules stuck in the transport pipe are compressed by the transport gas, making the blockage even worse.
It is difficult to find the blockage point, and there are 7 blockages in each transport pipe.
6″＞-th4′″IEL7, ``t″0□shi;, 1 or 801 諌1 is spent, and the gas flow rate in the pressurized tank increases due to the backflow of the transport gas, and this amount is transferred to other transport pipes. Since the powder flows to the outside through the powder, the normal amount of powder cut out and/or the solid-air ratio of the transport pipe is changed, which has the disadvantage of interfering with constant flow transportation of the powder.

An object of the present invention is to provide a powder and granular material distributing gas transport device that can easily and reliably detect a blocked state by detecting the differential pressure of each transport pipe to detect a decrease in the differential pressure at the time of blockage compared to the normal state. That's true.

Another object of the present invention is to detect a blockage state and use the detection output to close a shutoff valve installed in a transport pipe and a transport gas supply pipe, thereby preventing backflow of transport gas and powder that has blocked the transport pipe by the transport gas. An object of the present invention is to provide a powder/granular material distributing gas transport device capable of preventing compression of granular material.

Embodiments of the apparatus of the present invention will be described below with reference to the drawings.

In the figure, (1) is a pressurized tank with a powder input valve (2) at the top and a fluidized bed (3) at the bottom, and (4) is a fluidized bed (3).
The pressurized gas supply pipe (4) is equipped with a light power control valve (5), and this control valve (5) supplies the fluidized bed (3 ) is detected by the pressure detector (6), and is supplied to the pressure regulator (7).
7) to maintain the pressure in the fluidized bed at a required value.

(TN) (N is an integer of 2 or more) is a transport pipe connected to a pressurized tank (1), whose opening (9) is extended into the pressurized tank (1) and forms a fluidized bed (3). @ ffTN) h Pressurized tank of each transport pipe (TN) (
1) A transportation valve installed in an external position, which is fully open during transportation.
It is operated completely when not being transported.

(BN) is a transport gas supply pipe connected to the secondary side of the transport valve (vTN) of each transport pipe (TN), and each has a flow rate control valve (vFN) and a flow rate detector (Ii'DN). is installed, the detection signal from the flow rate detector (FDN) is supplied to the flow rate controller (FON), and the flow rate adjustment valve (VPN) is operated by the output of this controller (FON) to adjust the transport gas flow rate to the required value. maintained.

On the other hand, the detection signal of the pressure detector (6) and the detection signal of the pressure detector (PBN) arranged near the transport pipe (TN) of each transport gas supply pipe (BN) are on the differential pressure adjustment side ( R.O.
The flow rate controller CFON) is cascade-controlled by the output of this controller (ROM) so that the flow rate of the powder or granular material in each transport pipe (TN) is uniform or has a distribution ratio of Tosakaki. It is adjusted as follows. That is, transport pipe (TN
) If the flow rate of powder or granular material decreases, the differential pressure will decrease, and conversely, if the flow rate of powder or granular material increases, the differential pressure will increase, so in the former case, operate the flow control valve (VFN) in the direction to open the transport gas. The flow rate is increased to decrease the amount of powder material cut out, and in the latter case, the flow rate control valve ffFN') is operated in the direction of closing to decrease the transport gas flow rate and increase the amount of powder material cut out.

(OPN) is a comparator to which the output of the differential pressure controller (△PON) is supplied, and if the output of the controller (△P(3N)) increases more than the required set value, that is, the differential pressure 1iN is less than the required value When the amount decreases, a comparison output (SO) is obtained, which is supplied to an alarm circuit (ARN) such as a buzzer and flashing display to issue an alarm.

(VBN) is the flow rate detector (
This is the main valve installed on the downstream side of the FDN.

Next, to explain the operation of the apparatus of the present invention, first, the pressurized tank (1) is filled with powder or granules via the injection valve (2) with the transport valve (VTN) closed, and then the injection valve (2) is closed and the pressure regulating valve (5) is opened to supply pressurized gas to the fluidized bed (3) to increase the pressure inside the pressurized tank to a predetermined value.

Then open the source valve (VBN) and then open the transport valve (vTN).
By fully opening the tank (1), the powder and granular material in the tank (1) is sent out into the transport pipe (TN) according to the transport gas flow (QBN) and begins to be transported to the destination.

Therefore, in the steady state of transport, a differential pressure (,fN) is generated in the transport pipe (TN) according to the amount of powder material cut out, and this is supplied to the differential pressure controller (,fON), so the difference is The flow rate adjustment it (4r'oN) is controlled in cascade so that the pressure (NN) becomes a constant value, and the powder and granules are transported at a constant flow rate. .

When the transport -f (TN) is blocked by powder or granules in a steady state of transport, the differential pressure in the blocked transport pipe ('rN) becomes smaller than the differential pressure N- in the steady state, as shown in Figure 2. It decreases rapidly at the occlusion point is. Because of this, the differential pressure pricking part M1゛(R
Since the output of ON) increases, a comparison output (SO) is obtained from the comparator (OPN), and the alarm circuit (ARN) is activated to notify the blockage condition and to indicate the transport pipe in which the blockage has occurred.

As described above, according to the device of the present invention, the differential pressure of each transport pipe is detected, and a blockage state is detected by a decrease in the pressure difference. Therefore, the blockage state can be easily and reliably detected, and multiple pipes can be detected. It is possible to immediately detect which of the transport pipes is in a blocked state, and the differential pressure can be detected in the fluidized bed section containing only gas without powder or granules, and in the vicinity of the transport pipe of the transport gas supply pipe. Therefore, it has excellent features such as being able to easily detect pressure without using a porous plate such as sintered metal that is used for pressure detection at a location containing powder or granular material.

Next, another embodiment of the device of the present invention will be described with reference to FIG. In this example, the same reference numerals are given to the parts corresponding to those in FIG. 1, and detailed explanation thereof is omitted. However, in the configuration of FIG. 1, the output (SO) of the comparator (OPN) is It has the same configuration as in FIG. 1 except that it is supplied as a closing operation signal to the main valve (VBN).

With this configuration, □ and the comparison output (SC) from the comparator (OPN) when a blockage occurs in the transport pipe (TN) as described above.
) is obtained, this output completely closes the transport valve (VTN) and main valve (UBN) of the system where the blockage occurred, and therefore, the supply of powder and transport gas to the transport pipe (TN) is immediately started. Since the transport gas is stopped immediately, it is possible to prevent the transport gas from flowing back into the pressurized tank, and to prevent the influence on other steady transport pipes that do not cause blockage, as well as to prevent the powder and granules at the blockage position from flowing back into the pressurized tank. It has features such as no compression and easy removal of occluded powder and granules.

In each of the above embodiments, the case was explained in which the output of the differential pressure regulator (dON) was supplied to the comparator (OPN), but the output of the pressure detector (6) and (PBN) was subtracted. By supplying the pressure from the subtractor to the comparator, the same effect as on the mainland side can be obtained.

Further, the differential pressure detection position of the transport pipe (TN) is not limited to the upper side, but the differential pressure may be detected between two distant points or at a high pressure loss part such as an elbow.

Furthermore, in Fig. 5, instead of closing the main valve (VBN) by the output (SO) of the comparator (OPN), the flow rate control valve (VBN) is closed.
FN) may be closed.

[Brief explanation of drawings]

FIG. 1 is a system diagram showing one embodiment of the apparatus of the present invention, FIG. 2 is a graph showing differential pressure in a transport pipe for explaining the same, and FIG. 3 is a system diagram showing another example of the present invention. (1)...pressure tank, (3)...fluidized bed, (6)
...Pressure detector, (TN) ...Transport pipe, (BN)
...Transport gas supply pipe, (RON)...Differential pressure controller, (
PBN)...pressure detector, (VTN)...transport valve,
ffBN)...Main valve, (OPN)...Comparator. Patent Applicant: Kawasaki Steel Co., Ltd. Denka Engineering Co., Ltd. Procedural Amendment (Voluntary) - December 8, 1980”, 7, i Patent Office Commissioner Shima 1) Haruki Tono・2,7 Momme 61, Incident Indication 1981 Patent Application No. 171720 2 Name of the invention Powder and granule distributing gas transport device 3 Relationship with the person making the amendment Patent applicant address 1-1-28 Kitahonmachi-dori, Chuo-ku, Kobe-shi, Hyogo Prefecture
Name Kawasaki Steel Co., Ltd. Representative Hidebe Iwamura Address 1-4-1 Yurakucho, Chiyoda-ku, Tokyo Name
Denka Engineering Co., Ltd. Representative Aiso 6. Number of inventions increasing due to amendment
Supplementary Japanese Patent Application No. 56-171720 (1) On page 8 of the specification, line 9, the phrase ``detection shall be facilitated'' shall be amended to ``detection shall be facilitated''. (2) On page 9, line 1, there is a stone that corrects the word ``Genben (UBN) month'' with ``Genben (VBN) J.'' (3) On page 9, line 12, ``Pressure of the subtractor.'' There is
``The output of the subtractor.'' (4) Among the drawings, Figure 1 will be amended as attached. That's all: 1

Claims (3)

[Claims] (1) A plurality of transport pipes are connected to a pressurized tank having a fluidized bed supplied with pressurized gas with their openings facing the fluidized bed, and a transport gas supply pipe is connected to each of the transport pipes, respectively. The powder and granule distribution gas transport device is characterized in that a differential pressure between each of the transport pipes is detected, and a blockage state of each of the transport pipes is detected by a decrease in the pressure difference. Gas transport device. (2) A plurality of transport pipes are connected to a pressurized tank having a fluidized bed supplied with pressurized gas with their openings facing the fluidized bed, and a transport gas supply pipe is connected to each of the transport pipes, respectively. In the powder and granular material distributing gas transport device, the differential pressure between each of the transport pipes is detected, and shutoff valves interposed in the transport pipe and the transport gas supply pipe are closed as the pressure difference decreases. Powder distribution gas transport device. (3) The granular material distributing gas transport device according to claim 1 or 2, wherein the differential pressure detection end of the transport pipe is located near the fluidized bed section and the transport pipe of each transport gas supply pipe.