JPH0149544B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to pulverized fuel handling equipment, and in particular to a pulverized fuel handling equipment that allows pulverized coal to be injected into a blast furnace to replace a portion of the coke normally used. This invention relates to a fuel feeding device.

In smelting iron ore in blast furnaces, coke has traditionally been the material used to provide the carbon and also to generate the necessary heat during the smelting process. Coke, which generally accounts for about one-third of the contents in a furnace, is a very expensive and essential item in the production of iron. Therefore, it is important from an economic point of view to replace some of the used coke with cheaper coal.

Various prior art techniques are utilized to inject pulverized coal into blast furnaces, thereby replacing a portion of the coke currently in use with pulverized coal.

The present invention consists of a coal pulverizer that pulverizes and dries coal sent by a coal feeder from a storage container storing lumped coal into fine powder; a storage tank for storing fine powder; and a distribution means connecting the storage tank and several feed tanks associated therewith, from which the blast furnace receives fine powder from the feed tank through pressurized gas transfer means having a diluter and a distributor. This device has made it possible to commercialize a pulverized fuel feeding device that supplies charcoal, and its main parts are as follows.

The support mechanism for the distributor includes a pedestal having a seat that engages and supports a flange provided on the outer peripheral side wall of the distributor, ribs erected at predetermined intervals on the peripheral edge of the seat, and A bolt is screwed onto the flange so that its tip can come into contact with the peripheral end surface of the flange on the catch, and a bolt is screwed into the flange so that its tip can come into contact with the top surface of the catch, and the bolt is connected to the center of the lower part of the distributor. A split pipe is interposed between the connected vertical pipe for introducing pulverized coal mixed fluid gas and the diluter side pipe upstream thereof, and a soft packing is provided around each of these communication connection parts, and A split joint was installed to cover the outer peripheral surface of both pipes on the outside and in the vicinity.

A heater was installed in the pipe line that supplies air for dilution to the diluter installed in the pressurized gas pipe line. A pressure detector and a flow rate detector were installed in the pressurized gas transfer pipe line for diluting the gas to the diluter. Closes when the detection signal from each detector exceeds a predetermined value.
An ON-OFF valve is installed in the transfer line between the diluter and the distributor.

A water collection part is provided at the bottom of the surrounding frame of the horizontal coal feeder installed at the bottom of the storage container, one end of the U-shaped pipe is connected to the water collection part, and the other end is connected so that the liquid level of the water collection part is at a predetermined level. A drainage system with an opening to the atmosphere at a height that can be maintained.

A return piping having one end connected to the pressurized gas transfer pipe between the lower part of the supply tank and the distributor and the other end connected to the upper part of the supply tank and/or the upper part of the storage container, with a switching valve interposed therebetween. What was established.

A sampling pipe is connected in the middle of the distribution pipe from the pulverized coal storage tank to the supply tank, and two ON-OFF valves are installed at a predetermined interval in this sampling pipe, and the pipe between the ON-OFF valves is A purge gas introduction pipe is connected, and an ON-OFF valve is installed in this purge gas introduction pipe.

An embodiment of the present invention will be described in detail below with reference to the drawings.

First, an overall example of an apparatus to which the present invention is applied will be explained with reference to FIG.

In the pulverized coal feeding device illustrated in FIG.
Raw coal (unpulverized coal) is stored in storage container 1.
1 and flows down by gravity to the coal feeder 12 via the isolation valve 13. This coal feeder 12 supplies coal to the crusher 14, and this feeding rate is controlled by the coal feeder 12.
and thereby the pulverized coal output rate from the crusher 14 can be adjusted accordingly.

The crusher 14 functions to convert raw coal into pulverized coal having a suitable viscosity for conveying in a fluidized dense phase form into the blast furnace 15 .

As shown, an independently fired air heater 16 connected to the crusher 14 by a duct 22 supplies hot primary air to the crusher 14 to dry the coal and then pass it through a pipe 18 to a cyclone-type separator. The produced coal is transported to the inlet of No. 17. The hot primary air is produced by burning natural gas, blast furnace gas, coke oven gas, etc., which is introduced into the heater 16 through a pipe 19, with the air being connected to the heater 16 by a duct 21. It is supplied by an air blower 20. To allow adjustment of the ratio of the primary air flow rate depending on the coal flow rate through the crusher 14, the blower 20 is fitted with an adjustable air door.

The air-coal mixture entering the cyclone separator 17 is core separated and the coal passes by gravity fall through a line 24 to a storage tank 23, which line is provided with a normally open shutoff valve 25. . The very fine coal particles entrained in the primary air, as they leave the separator 17, are carried along with the air through a pipe 26 to a bag filter chamber 27 or other similarly functioning means, and are carried therein. be captured. The primary air flow is a low pressure chamber (not shown)
The collected micropulverized coal passes through a conduit 28 equipped with a normally open shutoff valve 29 to a storage tank 2.
3. During the crushing and storage period, the moisture evaporated from the coal surface is transferred to the exhaust pipe 2 along with the primary air.
It is discharged from 7'.

If desired, multiple pulverized coal generating units may be operated in parallel to supply coal to storage tank 23.
The use of multiple units allows for emergency repair maintenance or intermittent operation of any one unit without the need for shutting down the present pulverized coal feed system. Instead of providing extra crushing capacity with multiple coal generating units, auxiliary storage tanks can also be provided.
The auxiliary tank is connected to line 2 to receive some or all of the pulverized coal in excess of the current requirements of furnace 15.
4 and 28 accordingly.

Storage tank 23 is suitably vented to operate at atmospheric pressure and serves to provide storage of sufficient pulverized coal to feed a plurality of batch tanks 31A, 31B, and 31C leading to furnace 15. Tanks 31A-C are located at a lower level than storage tank 23, and a plurality of coal distribution lines 30A are connected thereto.
~C, respectively.

Remotely operable shutoff valves 32A, 32B, and 32C are attached to distribution lines 30A-C.
The tanks 31A to 31C are connected to the corresponding coal discharge pipe 34.
It is placed in communication with the pneumatic transfer line 33 by A to C. The discharge line includes a furnace 15 through line 33.
is selectively opened to allow flow of coal particles from one selected tank 31A-C at a time, and simultaneously closed to isolate tanks other than the currently selected tank from line 33. Discharge coal flow control valves (which may be shutoff valves) 35A-C are each installed.

The transfer pipe 33 includes a thinner 33A for changing the coal flow from a dense fluidized state to a lean fluidized state.
is provided, to which compressed air is supplied from a compressed air source 36 through a compressor 70, a control valve 37 and a check valve 38.

Also, although not shown, there are pipes (parts of 33' and 33) between each tank 31A to 31C and the dispersion device 33A.
The end of the pipe is replaceably connected to the corresponding tank and the lower part of the dispersion device 33A, and the diameter of the pipe is changed to the diameter of the blast furnace 15.
It can be changed according to the amount of pulverized coal injected into the pulverized coal.

As a result, the amount of pulverized coal injected into the blast furnace 15 can be changed and blown according to the operating mode of the blast furnace, such as the initial stage of pulverized coal injection into the blast furnace 15, a small amount of pulverized coal injection when the blast furnace is in production, or a large amount of pulverized coal injection when increasing production. This advantageously makes it possible to increase the degree of freedom on the quantity level.

The transfer line 33 between the diluter 33A and the distributor 39 includes vertical pipe sections 33a to 33d and a horizontal pipe 33 as shown in the figure.
a' to 33c' are arranged alternately, and each horizontal pipe section is connected in communication with the vertical pipe section by changing the conveyance direction with respect to the front and rear horizontal pipe sections when viewed from above. This is because the conveyance direction is changed in relation to other equipment, and this contributes to preventing clogging caused by changing the conveyance direction.

In the blast furnace 15 , the conduit 33 communicates with one or more distributors 39 and from there a number of coal supply pipes 40 are delivered to the individual tuyeres 4 of the furnace 15 .
It leads to 1. The number of distributors 39 as well as the number of tuyeres used by each distributor vary depending on the requirements of the blast furnace 15. Each of the pipes 40 is provided with a nozzle 42 extending through a tuyere 41;
This nozzle 42 has a double tube structure (not shown) with a cooling path between the inner and outer tubes, and is connected to the furnace 1.
5, which rapidly mixes the coal and blast in the furnace 15.

Inert gas is used to pressurize tanks 31A-C and also to fill the coal contents of tanks and storage tank 23. To this end, _N2 gas is supplied from compressed gas source 50 through compressor 71, control valve 57, and check valve 58 to resist the maximum expected back pressure in furnace tuyere 41 even at the maximum expected furnace demand. and is provided with sufficient transfer pressure to maintain a dense flow of coal from a given tank 31A-C to transfer line 33. The tuyere back pressure can reach pressures as high as about 4 Kg/cm ² and is caused by the high static pressure in the annular tube 51 that supplies the required process air to the furnace through the tuyere 41. Selecting an inert gas for pressurization and filling is preferred because it prevents coal from igniting within storage tank 23 and tanks 31A-C.

Valves 32A-C and discharge coal flow control valves 35A-
In addition to C, 35A'-C', tanks 31A-C are
Valves 52A-C, 5 are used to achieve the required pressurization, filling, venting, and pressure equalization functions, respectively.
3A-C, 54A-C, and 55A-C are provided. The pressurizing valves 52A-C are connected by appropriately arranged piping to the compressed inert gas source 50 through a check valve 56 and a control valve 57 and communicate with the upper portion of the respective tank 31A-C, and When the valve opens, it serves to pressurize the coal contents of the tank. The filling valves 53A-C are connected to the respective tanks 31A-C and are connected to the compressed gas source 5.
0 in parallel with the valves 52A to 52C, and the tank 31
Inert gas is introduced into the lower part of A to C to soak the coal inside with the gas. The release valves 54A-C function to vent each tank 31A-C to a suitable receptacle or chamber (not shown) upon opening.

The valves 55A to 55C are connected to the storage tank 23 via appropriate conduits.
and the respective tanks 31A to 31C, and function to equalize the pressure between the tanks 31A to C and the storage tank 23 upon opening. Storage tank 23
is filled with inert gas flowing through a conduit connecting it with a gas source 50 and comprising a control valve 60 and a check valve 61.

Upon operation of each valve in the _N2 gas line from compressed gas source 50, each of tanks 31A-C is configured to deliver pulverized coal to furnace 15 in a predetermined cycle order.
Alternately filled, pressurized and emptied.

1 and 2, a water collection part _12-1 is provided at the bottom of the surrounding frame L1 of the coal feeder 12 provided at the bottom of the coal storage container ₁₁ , and a U-shaped pipe is provided in the water collection part _12-1 . A drainage device is provided in which one end of _12-2 is connected for communication and the other end is opened to the atmosphere at a height position _l2 at which the liquid level f of the water collecting portion _12-1 can be maintained at a predetermined level _l1 .

That is, with the above configuration, the coal that falls from inside the storage container 11 into the surrounding frame _L1 for the coal feeder 12 that forms a part of the coal supply path L that communicates and connects the coal storage container 11 and the coal crusher 14. The U-shaped pipe _12-2 receives the accompanying moisture in the water collection part ^122-1 , maintains it at a predetermined level _l1 , and maintains the pressure inside the supply path L at _a predetermined pressure without changing it. The pulverizer 14 is automatically discharged outside the frame through the pulverizer 14, thereby reliably preventing the pulverizer 14 from flowing into the pulverizer 14, thereby stably maintaining its pulverizing and drying function.

In this example, the U-shaped pipe _12-2 is equipped with a valve _12-3 for discharging mixed coal at the bottom, and is also used to prevent blockage inside the pipe.
The ON-OFF valve _12-4 and the pressurized air jet pipe _12-5 are connected directly below the valve _12-4 , and the pressurized air jet pipe _12-5 is periodically turned ON ⁽ opened) temporarily _. ON
-OFF valve 12 _-6 is turned ON (open) to introduce pressurized air into the water collection side pipe to enable cleaning. Further, the outflow water and mixed coal from the atmospheric opening end of the U-shaped pipe _12-2 are discharged from the discharge valve _12-3 , and the coal-containing water is discharged into the storage tank _12-9 , and the supernatant water is pumped into the pump _12-7. The water is periodically supplied to other water storage tanks (not shown) etc. for effective use through an interposed suction pipe _12-8 .

In FIGS. 1 and 3 A and B, the very fine coal particles that are entrained from the cyclone type separator 17 together with the separated air through the pipe 26 and into the bag filter chamber 27 are removed by the filter cloth 27a inside the bag filter chamber 27. At this time, the bag type filter chamber 2
A discharge pipe 26b having discharge ports 26c, 26c' on both sides is arranged on the diameter line below the filter cloth 27a in the filter chamber 7, and the discharge pipes 26b have discharge ports 26c, 26c' facing the inner wall surface of the side part of the filter chamber at equal intervals. At the same time, the distal end of the pulverized coal-associated gas introduction pipe 26 is connected to the central portion of the discharge pipe 26b in the longitudinal direction.

That is, the front part 26a of the pipe 26 is preferably
The bag-shaped filter is inserted through the bag-type filter chamber 27 with an upward slope of 60 degrees or more, and is discharged into the chamber without depositing separate coal particles in the pipe. In order to uniformly discharge the fluid from the discharge ports 26c and 26c' of the disposed discharge pipe 26b toward the side inner wall surface of the chamber 27, the discharged fluid is caused to collide with the side inner wall surface and then flow upward along the inner wall surface. As a result of the currents being transformed obliquely to the left and right, colliding with each other at the intermediate portion, and being transformed into an upward flow and directed toward the peripheral part of the filter cloth 27a, a no-upward flow zone Z is created in the area surrounded by these upward transforming currents. This can be used as a fall zone for fine coal that is collected by the filter cloth 27a and periodically vibrated away, thereby preventing a large amount of fine coal from adhering to the filter cloth 27a and reliably preventing ignition accidents. It is something.

That is, if the discharge port is simply opened upward on the axis of the chamber 27 without providing the discharge pipe 26b, the fine coal will directly collide with the filter cloth 27a, which will adversely affect the life of the filter cloth 27a. Furthermore, as a result of the wide-angle upward discharge radially covering the entire lower surface of the filter cloth 27a, the no-upflow zone cannot be formed, and therefore, the filter cloth 27a
Even if the fine coal collected in step a is periodically vibrated and separated, most of it is returned to the filter cloth 27a due to the upward flow.
This problem is solved by the above-mentioned structure, since a large amount of dust adheres to the dust and becomes impossible to collect, which makes continuous operation impossible and at the same time causes a fire accident.

When the pulverized coal feeding device is in a loaded state, that is, in an operating state for feeding pulverized coal to the blast furnace, the tanks 31A to 31C
Pulverized coal feeding and its switching function, dispersion device 33A
It is impossible to test the solid-gas ratio adjustment function, etc. in the blast furnace because it would greatly affect blast furnace operation. However, in order to conduct the test with the blast furnace in an operating state where no pulverized coal is fed, conventionally the pulverized coal is fed to just before the nozzle 42 attached to the blast tuyere of the blast furnace, and a separate pulverized coal recovery equipment is installed here. Although such methods were devised, continuous testing was not possible, and they were complicated and expensive.

Therefore, in this example, the transfer pipe 3 in the diluter 33A and the distributor 39 and on the upstream side of the diluter 33A is
Connect return piping R ₁ and R ₂ to 3 and connect these
ON-OFF valves R ₃ to _{R 8} are interposed to communicate with the storage tank 23, the inlet of the cyclone 17 of the separator, and the inlet of the bag filter 27, and the return pipes R ₁ and R ₂ of the transfer pipe 33 are connected to each other. ON- directly above the connection part
Provide OFF valves R ₁₄ and R ₁₅ , close R ₁₄ and open R ₁₅ .
By arbitrarily combining the closing and opening of each valve of R ₃ to _{R 8} , the pulverized coal feeding operation of the tantars 31A to 31C is performed sequentially, and the storage tank 23 - tanks 31A to 31C - diluter 33A - storage tank 23 (or cyclone Forms a closed loop with 17 bag-shaped filter chambers 27) to easily perform functional tests of various equipment, valves, pulverized coal feeding control system, pulverized coal feeding function, various detection terminals, etc. in the same loop under low pressure conditions. It is possible.

Also, there is a return pipe _R10 in the middle of the return pipe _R1 .
are connected in communication, and an ON-OFF valve _R9 is interposed therebetween, and then branch pipes _R16 to _R18 are connected in communication, and ON-OFF valves are connected to these.
Tanks 31A to 3 with OFF valves and R ₁₁ to R ₁₃
Connect to 1C. Close valves R ₁₅ , R ₃ , and R ₄ ,
In addition to the pulverized coal feeding operation order of tanks 31A to 31C, the corresponding ON-OFF valves R ₁₁ to R ₁₃ are opened and tank 31
A~31C-Diluter 33A-Tank 31A~31
By forming a closed loop of C, the loop can be easily placed under the same high pressure conditions as in actual operation, allowing reliable and reliable functional testing of various equipment, valves, pulverized coal feed control system, pulverized coal feed function, various detection terminals, etc. It is accurate and easy to implement.

The diluter 33A is connected to the tanks 31A to 3 as described above.
Since the pulverized coal flow from 1C is conveyed together with N ₂ gas in a dense fluidized state, the compressor 70 is controlled from the compressed air source 36 in order to change it into a lean fluidized state and improve the conveying efficiency of the pulverized coal. Valve 3
7- Compressed air is supplied through the check valve 38;
At this time, due to moisture accompanying the compressed air, dew condenses in the transfer pipe 33 after the thinner 33A, and pulverized coal adheres and accumulates on the inner wall of the pipe, the inner wall of the distributor 39, etc., causing a clogging phenomenon, which will be described later. Even if the clogging prevention device is used to remove the deposits, the problem may not be cleared.

For this reason, conventionally, a cooler was installed downstream of the compressor 70 to cool the compressed air below the dew point and remove moisture. It is unfavorable from the viewpoint of economic and energy saving.

In order to solve this problem in the present invention, a heater 72 is provided downstream of the compressor 70, as shown in FIG.

That is, the heater 72 includes, for example, the blast furnace body, steam generated from cooling equipment, high-temperature exhaust gas generated from the blast furnace, combustion high-temperature exhaust gas from a hot stove installed near the blast furnace, steam generated from slag cooling equipment, etc. By introducing a large amount of thermal energy generated from the auxiliary equipment, the compressed air is brought to a high temperature state at low cost and supplied to the diluter 33A, thereby advantageously preventing dew condensation, resulting in a large energy saving effect.
Furthermore, the heater 72 itself can also be of a simple indirect replacement type, which is advantageous in terms of equipment.

In Figures 4 to 7 A and B, the distributor 39 is supported by a pedestal 39b on a support 39a provided on the side shell 15a of the blast furnace 15, and this support mechanism is enlarged in Figures 6 A and B. As shown, ribs 39e are provided at appropriate intervals along the peripheral edge of the seat 39d on the pedestal 39b side that engages and supports the flange 39c provided on the side of the main body 39' of the distributor 39. A bolt 39f of the flange horizontal position adjustment piece is screwed into the flange 39c so as to be able to come into contact with the peripheral end surface of the flange 39c, and the bolt 39f comes into contact with the upper surface of the seat 39d near the tip of the bolt 39f. Bolt 3 of the flange height level adjustment piece
9g, and each bolt 39 on both sides.
Bolts 39h and 39 that fix the catch seat 39d and flange 39c in the tightened position after adjustment operations of f and 39g
h', each of the bolts 39h, 39h' has its tip (lower part) screwed into the seat 39d, and its body (upper part) engaged with and passed through the elongated holes 39i, 39i' provided in the flange. . Each of the elongated holes 39i, 39i' has a length within which the horizontal position of the flange 39c can be adjusted by advancing and retracting the bolt 39f, and its long axis direction is the same as the moving direction of the bolt 39f.

With this configuration, even if the distributor 39 main body 39' is in a non-horizontal state due to deformation or positional movement of any of the support body 39a, pedestal 39b, and iron skin 15a, the bolts 39h and 39h' can be tightened. Bolt 39f,
Rotate 39g to remove flange 39c on catch seat 9d.
The horizontal state can be easily returned by adjusting the position, and then this horizontal state can be fixed and maintained by tightening the bolts 39h and 39h' again.

Also, when the distributor 39 and main body 39' move from a non-horizontal state and return to a horizontal state, naturally the main body 3
The vertical pipe 39j for introducing the pulverized coal mixed fluid gas, which is connected to the center of the lower part of the pipe 9', also moves and is no longer able to maintain its normal relationship with the main body 39'. Since the mixed fluid is discharged in a biased manner and it becomes impossible to distribute the mixed fluid equally to each of the distribution pipes 40, as shown in enlarged view in FIG. A split pipe 39k is interposed, a soft packing 39m is provided around each of these communication connection portions 39l, and a split joint 39n is provided to cover the outer peripheral surface of both pipes 39j, 39k, 39k, 33d on the outside and in the vicinity thereof. By tightening this with a bolt 39p to a predetermined pressure, even if the main body 39' changes to a non-horizontal state and returns to a horizontal state as shown in FIG. 4, the accompanying movement of the vertical pipe 39j can be prevented. This allows the uniform distribution function to be maintained and maintains a normal relationship with the main body 39'.

Lower part of storage tank 23 or supply tanks 31A to 31C
distribution pipe (any of 30, 30A to 30C)
, a sampling pipe 23a with two ON-OFF valves 23b and 23c interposed therein is connected, and a purge _N2 gas introduction pipe 23d is connected between each valve.
An ON-OFF valve 23e is provided in the N ₂ gas introduction pipe 23d.

Further, the open end of the sampling pipe 23a is inserted into the storage container 23f.

This configuration turns on the stored pulverized coal in the storage tank.
-Open the OFF valve 23b, close the ON-OFF valve 23c, and store the dead weight on the upstream side of the ON-OFF valve 23c. Immediately after that, close the ON-OFF valve 23b and then open the ON-OFF valve 23c. ON-
The OFF valve 23e is opened, N ₂ gas is introduced into the sampling pipe 23a, the contained pulverized coal is discharged into the storage container 23f, and then the ON-OFF valves 23c, 23 are opened.
e is closed to quickly and reliably perform one sampling. Therefore, it is possible to sample the pulverized coal as it exists in the storage tank, including its water content and
This allows the viscosity structure etc. to be detected accurately and quickly.

If pulverized coal is deposited in the middle of the transfer pipes 33', 33 between the tanks 31A to 31C and the distributor 39, in order to quickly remove the accumulation, the transfer pipe 33 is placed immediately before the distributor 39 as shown in FIG. An ON-OFF valve _S1 is provided, and a pressure detector P and a flow rate detector Q are installed at appropriate locations on the dilution air pressure line 33B to the diluter 33A, and the signals from this are introduced, so that the signal from P is at a steady value. If the signal from Q exceeds the upper limit of the steady value when it is below the lower limit, the signal from P exceeds the upper limit of the steady value, and the signal from Q exceeds the lower limit of the steady value. A clogging occurrence prediction detector S ₂ generates a clogging occurrence prediction signal on the downstream side of the diluter 33A.
and an operating tank (for example, 31A) into which a clogging prediction signal from the detector _S2 has been introduced.
A controller _S3 is connected to the controller _S3 , which operates the pressurizing valve ventilation valve control device _C0 by a signal to interrupt the steady control operation of the pressurizing valve 52A of the operating tank and closes the ON-OFF valve _S1 . After confirming the interruption of the pressurization valve and the completion of the closing operation of the ON-OFF valve _S1 , the pressurization valve control device _C0 is immediately operated to apply ultra-high pressure control to the pressurization valve for a predetermined number of seconds, and then the vent valve 51A is immediately closed. A clogging prevention device is provided which includes a de-accumulation device _S4 which is opened and steeply brings the inside of the tank and the transfer pipes 33' and 33 to atmospheric pressure a predetermined number of times. When this clogging prevention operation is completed, the signal is introduced to the controller S ₃ and the ON-OFF valve S ₁ and pressurizing valve 5 are activated.
Return 2A to the original control state.

That is, the clogging prevention device of this example repeatedly applies ultra-high pressure and steep release within the transfer pipes 33' and 33 between the operating tank and the ON-OFF valve _S1 , thereby vibrating the pulverized coal accumulation area. This is to reliably prevent clogging, that is, transition to a blocked state.

In addition, while this clogging prevention device is in operation, the ON-OFF valve
The ON-OFF valve is installed in the pipeline from S ₁ to the nozzle 42 in the tuyere 41 to prevent the high-pressure, high-temperature gas in the furnace from flowing back from the nozzle 42 and causing burnout, and to prevent sub-effects on the blast furnace operation. A gas pipe _Gp for blowing natural gas at a predetermined pressure as an alternative fuel suitable for pulverized coal is connected to the vicinity and downstream of _S1 , and the valve of the gas pipe _Gp is opened at the same time as the ON-OFF valve _S1 is closed. The ON-OFF valve
ON- such that the valve S ₁ is closed at the same time as S ₁ is opened.
OFF valve _S1 and valve _S4 can be linked together.

As is clear from the above explanation, the present invention is a so-called pulverized fuel feeding device that supplies pulverized coal to a blast furnace, and has been put to practical use in the stable and safe supply of pulverized coal in accordance with blast furnace operation. Problems that have been raised as hindrances include increased drying load due to moisture attached to the lump coal supplied to the coal crusher and clogging during air transport.

The problem of ignition caused by the accumulation of fine powder collected in the bag-type filter chamber of the separator.

Difficulties in checking the supply tank and various devices and detection terminals, as well as the pulverized coal transport control function, etc., during a trial run after setup or during actual operation.

Problems with equipment energy conservation in preventing electrical formation after the diluter.

When the distributor is installed near the blast furnace body, it is difficult to maintain the horizontal position of the distributor due to movement of the support mechanism, thermal strain deformation, etc., that is, the problem of normalizing the distribution function due to disturbance to the distributor.

Difficulties in sampling pulverized coal before feeding it to the blast furnace.

Problems with clogging that occurs in the transfer pipeline after the supply tank due to causes other than condensation and the resulting fire.

All of these problems have been solved by the above-mentioned main structure, and the device has been improved to advantageously be put to practical use in industry, and has a great effect of contributing to the industry.

[Brief explanation of drawings]

Fig. 1 is an overall side explanatory view showing an embodiment of a part of the main parts of the present invention, Fig. 2 is a side explanatory view showing one embodiment of a drainage device in the present invention, and Fig. 3 A and B are an explanatory side view of the present invention. 1 shows an embodiment of the essential parts of the bag-type filter chamber in FIG.
B is a cross-sectional view seen from the direction of the arrow A, FIG. 4 is a schematic side view showing one embodiment of the support mechanism of the distributor and its peripheral structure in the present invention, and FIGS.
B is an enlarged view of the distributor shown in Fig. 4 and the structure of its immediate part;
Figures A and B are enlarged explanatory views of the essential parts of the main part in the circle "a" of the example of the support mechanism of the distributor main body shown in Figure 5B, where A is a plan view, B is a side sectional view, and Figures 7A and B are 4 is an explanatory diagram showing an enlarged view of the structure of the vertical pipe of the distributor shown in FIG. be. 11...Coal storage container, 12...Coal feeder, 14...Crusher, 16...Air heater, 2
0... Air blower, 20A... Wind furnace (carrier medium flow rate adjustment means), 17... Cyclone type separation device, 27
... Bag type filter chamber, 23 ... Storage tank, 30A
~C...Coal distribution pipe line, 32A~C...Coal introduction control valve, 31A~C...Tank, 34A~C...
Coal discharge pipe line, 35A to C...coal discharge control valve,
33...Transfer line, 33A...Diluter, 36...
Compressed air source, 39...distributor, 39'...distributor body, 39d...socket, 39e...flange, 3
9f...Horizontal position adjustment bolt, 39g...Height level adjustment bolt, 39j...Vertical pipe, 3
9n... split type joint, 40... supply pipe to the furnace, 41... tuyere, 50... inert gas source,
52A-C...pressurization valve, 53A-C...filling valve, 54A-C...ventilation valve, 55A-C...pressure equalization valve, _12-2 ...U-shaped pipe, 26b...discharge Pipe, 23a...Sampling pipe, R ₁ , R ₄ ...
Return piping, 72...Heater, _P1 to _P5 ...
Pressure detector, _Q1 to _Q5 ...Flow rate detector.

Claims (1)

[Scope of Claims] 1. A coal pulverizer that pulverizes and dries coal sent from a storage container storing lumped coal by a coal feeder into fine powder: A pulverized coal discharged from the pulverizer is passed through a separation device. a pressurized gas transfer means having: a storage tank for receiving and storing; and distribution means connected to the storage tank and several feed tanks associated therewith, and having a diluter and a distributor from this feed tank to the blast furnace; In a pulverized fuel feeding device that supplies pulverized coal through a pulverized fuel, the support mechanism for the distributor includes a pedestal having a seat that engages and supports a flange provided on the outer peripheral side wall of the distributor, Ribs are set up on the periphery at predetermined intervals, and bolts are screwed into the ribs so that the tips can come into contact with the peripheral end surface of the flange on the catch, and the tips can come into contact with the flange on the top surface of the catch. At the same time, a split pipe is interposed between the vertical pipe for introducing the pulverized coal mixed fluid gas, which is connected to the bottom center of the distributor, and the pipe on the diluter side upstream thereof. A pulverized fuel feeding device characterized in that a soft packing is provided around each communication connection portion, and a split joint is provided to cover the outer peripheral surfaces of both pipes on the outside and in the vicinity thereof. 2. The pulverized fuel feeding device according to claim 1, characterized in that a heater is interposed in a pipe line that supplies dilution air to a diluter provided in a pressurized gas pipe line. 3 A pressure detector and a flow rate detector are installed in the pressurized gas transfer line for diluting to the diluter, and an ON- is closed when the detection signal from each detector exceeds a predetermined value.
Claims 1 and 2, characterized in that an OFF valve is provided in the transfer line between the diluter and the distributor.
The pulverized fuel feeding device according to any one of paragraphs. 4 A water collection part is provided at the bottom of the surrounding frame of the horizontal coal feeder installed at the bottom of the storage container, and one end of the U-shaped pipe is connected to the water collection part, and the other end is connected so that the liquid level of the water collection part is at a predetermined level. The pulverized fuel according to any one of claims 1, 2, and 3, further comprising a drainage device that opens to the atmosphere at a height that can maintain the same level. feeding device. 5. Return piping with one end connected to the pressurized gas transfer pipe between the lower part of the supply tank and the distributor, the other end connected to the upper part of the supply tank and/or the upper part of the storage container, and with a switching valve interposed therein. Claims 1, 2, and 3 are characterized in that
The pulverized fuel feeding device according to any one of Item 4. 6 Connect a sampling pipe in the middle of the distribution pipe from the pulverized coal storage tank to the supply tank, insert two ON-OFF valves at a predetermined interval in this sampling pipe, and connect the pipe line between the ON-OFF valves. Connect the purge gas inlet pipe to the purge gas inlet pipe, and turn ON-
Claims 1, 2, 3, 4, and 5, characterized in that an OFF valve is provided.
The pulverized fuel feeding device according to any one of paragraphs.