JPH01119633A - Raw material and fuel supplying device - Google Patents

Abstract

PURPOSE:To enable the rapid change of the kinds of raw materials and the ratio of the raw materials and fuel in compliance with the change in the condition in a flash smelting furnace by feeding the raw materials and fuel separately, joining the materials and fuel just before a lance pipe to supply both to the lance pipe and providing a raw material storage tank to the part right above a raw material supplying tank. CONSTITUTION:A feeding device 35a of the raw material storage tank is stopped at the time of changing the raw materials according to the furnace condition, for example, changing the raw materials E to F. After the raw materials E in a raw material supplying tank 39 are fed to a raw material pressurizing tank 41, the feeder 35b of the raw material storage tank in the lower part of the raw material storage tank is operated to store the raw materials F in the raw material supplying tank 39. A raw material supplying valve 40 is opened to supply the raw materials E in the tank 39 to the pressurizing tank 41 when the raw materials E in the tank 41 are substantially run out. The fuel feeding rate and the flow rate of the gas for reaction are controlled by changing the set value of a feeding device 31 of the fuel pressurizing tank and the set value of a control valve 56.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an improvement in a device for supplying raw materials and fuel to a lance pipe for charging raw materials and fuel into the settler section of a flash smelting furnace. be.

[Prior Art] In a flash smelting furnace using a lance pipe, smelting raw materials such as ore, solvent, and smoke ash (hereinafter simply referred to as raw materials) and solid fuel such as pulverized coal (hereinafter simply referred to as fuel) are ) can be injected into the melt in the settler section of the furnace together with a reaction gas, making it possible to significantly increase the ability to dissolve ore. equipment is used.

In FIG. 2, A is a storage tank for storing feed ore. 1
is a cutting device, which is connected to one end of the belt conveyor 2, and the other end of the belt conveyor 2 is connected to the receiving port of the packet conveyor 3.

A discharge end of the packet conveyor 3 is connected to one end of a chain conveyor 4, and the other end of the chain conveyor 4 is open to the upper part of the supply tank receiving valve 5. A supply tank 6 is provided below the supply tank receiving valve 5, and a lift tank 8 is provided below the supply tank 6 via a supply valve 7.

The carrier gas pipe 9 is connected to the lower part of the lift tank via a pressure reducing valve 11 and pressurizing valves 12 and 13. Further, the carrier gas pipe 10 merges with the ore supply pipe 14 provided in the lift tank 8 at a confluence point P1 via a pressure reducing valve 16 and a booster valve 17.

Next, the operation of the apparatus shown in FIG. 2 will be explained.

Storage tank A stores the material to be injected into the lance pipe, that is, the feed ore obtained by mixing raw materials and fuel in advance.

During blowing, the carrier gas B such as compressed air that has passed through the carrier gas pipe 9 is guided into the lift tank 8 through the pressure reducing valve 11 and the pressurizing valves 12 and 13. On the other hand, the transport gas B that has passed through the transport gas pipe 10 passes through the pressure reducing valve 16 and the booster valve 17 and reaches the confluence point P with the ore supply valve pipe 14 from the lift tank 8.
I am guided by 1.

The feed ore in the lift tank 8 is fed under pressure to the lance pipe 18 through the ore supply pipe 14 and the ore supply valve 15 by these transport gases B, and the reaction gas C whose pressure is regulated by the flow rate control valve 20 At the same time, it is blown into the furnace 19 from the lance pipe 18.

When the supply ore in the lift tank 8 falls below a predetermined amount, the pressure equalization valve 23 provided in the pressure equalization pipe 22 is opened, and the supply tank 6
After making the pressure in the tank and the pressure in the lift tank 8 the same, the supply valve 7 is opened and the feed ore in the supply tank 6 is transferred to the lift tank 8.
supply to.

After confirming that all the feed ore in the supply tank 6 has fallen,
The supply valve 7 and the pressure equalization valve 23 are closed, and the pressure relief valve 24 provided in the supply tank is opened to reduce the pressure inside the supply tank 6 to atmospheric pressure.

Thereafter, the supply tank receiving valve 5 is opened, and the chain conveyor 4, packet conveyor 3, belt conveyor 2, and cutting device 1 are sequentially operated to store the feed ore in the supply tank 6. When a predetermined amount of feed ore is stored in the supply tank 6, the cutter M1, belt conveyor 2, packet conveyor 3, and chain conveyor 4 are stopped in this order, and the supply tank receiving valve 5 and pressure release valve 24 are closed. . Thereafter, this series of operations is continuously performed by detecting the amount of ore to be fed in the supply tank 6 and lift tank 8.

By the way, the ratio of raw material to fuel during ore feeding is determined by calculating the heat balance based on the charging time to the furnace per unit time, the composition of the raw material, the oxygen concentration in the reaction gas, etc. Since the feed supply equipment creates and stores a large amount of feed ore in advance, it is possible to quickly respond when changing the raw material composition or the amount of ore feed in response to changes in the situation inside the furnace. The problem is that it is difficult.

[Problems to be Solved by the Invention] The present invention provides for a flash smelting furnace using a lance pipe, in which raw materials and fuel are supplied to the lance pipe. This invention relates to a device that allows quick response when changing ore reserves.

[Means for Solving the Problems] In order to solve the above-mentioned problems, the device of the present invention transports raw materials and fuel separately, combines the raw materials and fuel in front of the lance pipe, and supplies the raw materials and fuel to the lance pipe. At the same time, by installing multiple raw material storage tanks directly above the raw material supply tank, we have made it possible to quickly change the type of raw material and the ratio of raw materials to fuel according to changes in the internal conditions of the flash smelting smelting furnace. It is something. Embodiments of the present invention will be described below with reference to FIG.

D is a fuel storage tank, and E and F are raw material storage tanks that store raw material E1 and raw material F.

The fuel storage tank cutting device 25 is attached to one end of a screw conveyor 26, and the other end of the screw conveyor 26 opens above a fuel supply tank receiving valve 28 attached to the upper part of the fuel supply tank 27.

A fuel pressurized tank 30 is provided below the fuel supply tank 27 via a fuel supply valve 29 . Fuel pressurized tank 30
A fuel pressurized tank cut-out device 31 and a screw conveyor 32 are provided at the bottom of the fuel tank, so that fuel can be fed into a fuel flow pipe 33. Further, the fuel pressurization tank 30 is provided with a pressurization pipe 58 for removing the fuel without any trouble. The fuel flow pipe 33 joins the raw material flow pipe 34 at P2.

In addition, the raw material storage tank cutout device @35a provided at the lower part of the raw material storage tank E is attached to one end of the screw conveyor 36, and the other end of the screw conveyor 36 is connected to the raw material supply tank receiving unit attached to the upper part of the raw material supply tank 39. Valve 3
It opens above 8.

Further, the raw material storage tank cutting device 35b provided at the lower part of the raw material storage tank F is connected to the raw material supply tank 39 through the chute 37.
It opens above a raw material supply tank receiving valve 38 attached to the top of the tank.

A raw material pressurized tank 41 is provided below the raw material supply tank 39 via a raw material supply valve 40 . Raw material pressurized tank 41
A raw material pressurized tank cut-out device 42 and a screw conveyor 43 are provided at the bottom of the raw material pressurized tank and a screw conveyor 43 are provided so that the raw material can be fed into the raw material flow pipe 34. Further, the raw material pressurizing tank 41 is provided with a pressurizing pipe 44 for cutting out the raw material without any trouble. And raw material flow pipe 3
4 joins the fuel flow pipe 33 at P2, and then connects to the lance pipe 18 via a lance hose 45.

[Production use] Next, the mode of operation of the above embodiment will be explained.

During blowing, fuel is cut out from the fuel pressurized tank 30 while being regulated by a fuel pressurized tank cut-out device 31, and is supplied to a fuel flow pipe 33 via a screw conveyor 32.

The amount of fuel to be supplied is determined by calculating the heat balance based on the amount charged per unit time, the composition of the raw materials, the oxygen concentration in the reaction gas, etc.

The conveying gas B passes through the pressure reducing valve 46, and after part of it branches off,
Pressurized! ! 58 and a pressurizing valve 47 provided on the way.
After being adjusted, the fuel enters the pressurized fuel tank 30 and the internal pressure of the pressurized fuel tank 30 is made slightly higher than the conveying pressure to improve cutting.

The other side passes through the pressurizing valves 48 and 49 and is connected to the screw conveyor 3.
The fuel supplied from P2 is transported to the confluence P2.

When the fuel in the pressurized fuel tank 30 becomes less than a predetermined amount, the fuel supply valve 29 is opened and fuel is supplied into the pressurized fuel tank 30. After confirming that the fuel supply tank 27 is empty, the fuel supply valve 29 is closed and the pressure relief valve 50 is opened to reduce the pressure inside the fuel supply tank 27 to atmospheric pressure. After it is confirmed that the pressure inside the fuel supply tank 27 has decreased, the fuel supply tank receiving valve 28 is opened, and then the screw conveyor 26 and the fuel storage tank cut-out device 25 are operated to supply fuel into the fuel supply tank 27. be done.

When a predetermined amount of fuel is stored in the fuel supply tank 27,
The fuel storage tank extraction device 25 and the screw conveyor 26 are stopped in this order, and then the fuel supply tank receiving valve 28 and the pressure release valve 50 are closed.

Thereafter, this series of operations is automatically performed by detecting the amount of fuel in the supply tank and the pressurized tank.

On the other hand, the raw material is cut out from the raw material pressurized tank 41 while being regulated by the raw material pressurized tank cutting device 42, and is supplied to the raw material flow pipe 34 via the screw conveyor 43.

The transport gas B passes through the pressure reducing valve 51, and after part of it branches off,
After passing through the pressurizing pipe 44 and being regulated by a pressurizing valve 52 provided midway, the material enters the raw material pressurizing tank 41 and the internal pressure of the raw material pressurizing tank 41 is made slightly higher than the conveying pressure to improve cutting. The other one passes through pressurizing valves 53 and 54 and conveys the raw material supplied from the screw conveyor 43 to the confluence point P2.

The raw materials and fuel combined at P2 are supplied to the lance pipe 18 via the lance hose 45, and the reaction gas pipe 21,
It is blown into the furnace interior 19 of the flash smelting furnace together with the reaction gas C supplied to the lance pipe 18 via the lance hose 55.

Note that the flow rate mi of the reaction gas is determined by the opening degree of the control valve 56.

When the raw material in the raw material pressurized tank 41 becomes less than a predetermined amount, the raw material supply valve 40 is automatically opened, and the raw material in the raw material supply tank 39 is supplied into the raw material pressurized tank 41. After confirming that the raw material supply tank 39 is empty, the raw material supply valve 4
0 is closed, and the pressure relief valves 57 of the raw material supply tanks 39 are opened to make the pressure in each supply tank the same as atmospheric pressure. Next, the raw material supply tank receiving valve 38 is opened, and the screw conveyor 36 and the raw material storage tank cut-out device 135a are operated to transfer the raw material E, or the raw material storage tank cut-out device 35b is operated to transfer the raw material F through the chute 37, or the screw conveyor 36, raw material storage tank cutting device 35a, 35
b is operated, and raw material E and raw material F are stored in the raw material supply tank 39 at a predetermined ratio.

After a predetermined amount of raw material is stored in the raw material supply tank 39, the screw conveyor 36, the raw material storage tank cutting device 35a or 35b, or both are stopped, and the raw material supply tank receiving valve 38 and the pressure release valve 57 are closed.

After this, this series of operations is automatically performed by detecting the amount of raw material in the raw material supply tank and the raw material pressurizing tank.

When changing the raw material according to the furnace condition, for example, when changing from raw material E to F, the raw material storage tank cutting device 35a is stopped,
Next, the screw conveyor 36 is stopped, and after the raw material E in the raw material supply tank 39 is delivered to the raw material pressure tank 41, the raw material storage tank cutting device 35b at the lower part of the raw material storage tank F is activated, and the raw material F is supplied as a raw material. It is stored in tank 39.

Then, when the raw material E in the raw material pressurized tank 41 is almost exhausted, the raw material supply valve 40 is opened, and the raw material supply tank 3
The raw material F in 9 is supplied to the raw material pressurized tank 41. Next, the set values of the fuel pressurized tank cut-out device @31 and the set values of the control valve 56 are changed to adjust the cut-out amount of fuel and the flow of reaction gas.

Furthermore, when blowing is performed by mixing raw material E and raw material F, when attempting to change the raw material ratio, the set values of the raw material storage tank cutting devices 35a and 35b are adjusted to change the respective cutting amounts. do. The change in fuel amount associated with this change is similar to the above, and the setting value of the fuel pressurization tank cutting device 31 and the setting of the control valve 56 are changed almost at the same time as the raw material whose mixture ratio has been changed is cut out from the raw material pressurization tank 41. , adjust the amount of fuel cut out and the flow rate of reaction gas.

Also, when it becomes necessary to inject only fuel due to furnace conditions,
Raw material pressurized tank cutting device 42 and screw conveyor 4
3 and adjust the control valve 56 to adjust the flow rate of the reaction gas.

In this example, a screw conveyor or a chute that utilizes free fall is used as a conveyance device for fuel and raw materials between the fuel storage tank or raw material storage tank and each supply tank, but this conveyance device does not meet the purpose. It goes without saying that the type does not matter as long as it can be achieved.

Further, in this embodiment, in order to simplify the explanation, an example is shown in which two raw material storage tanks are provided directly above the raw material supply tank, but three or more raw material storage tanks can be provided as necessary.

[Effects of the Invention] As described above, since the apparatus of the present invention has a plurality of raw material storage tanks directly above the raw material supply tank, it is possible to easily change the type of raw materials or change the mixing ratio. In addition, because the transportation systems for raw materials and fuel are separated, the fuel F required when changing raw materials or changing the mixing ratio is reduced.
Since the amount of 1 can be easily changed, the optimum blowing mixture according to the furnace conditions can be maintained at all times.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an embodiment of the present invention, and FIG. 2 is a diagram showing a conventional device. 1... Cutting device, 2... Belt conveyor, 3...
・Packet conveyor, 4...Chain conveyor, 5...
・Supply tank reception valve, 6... Supply tank, 7... Supply valve, 8... Lift tank, 9... Piping for carrier gas, 10... Piping for carrier gas, 11... Depressurization valve, 12
... Pressure valve, 13 ... Pressure valve, 14 ... Ore feed supply pipe, 15 ... Ore feed supply valve, 16 ... Pressure reducing valve, 17.
...Booster valve, 18...Lance pipe, 19...
・Furnace interior, 20...Flow control valve, 21...Reaction gas piping, 22...Pressure equalization piping, 23...Pressure equalization valve, 24.
... Pressure handling valve, 25 ... Fuel storage tank cut-out device, 26
... Screw conveyor, 27 ... Fuel supply tank, 28 ... Fuel supply tank receiving valve, 29 ... Fuel supply valve, 30 ... Fuel pressurization tank, 31 ... Fuel pressurization tank cutout Device, 32...Screw conveyor, 3
3... Fuel flow pipe, 34... Raw material flow pipe, 35a.
... Raw material storage tank cutting device, 35b... Raw material storage tank cutting device, 36... Screw conveyor, 37...
Chute, 38... Raw material supply tank receiving valve, 39...
・Raw material supply tank, 40...Raw material supply valve, 41...
Raw material pressurized tank, 42... Raw material pressurized tank cutting device, 43... Screw conveyor, 44... Pressurized piping, 45... Lance hose, 46... Pressure reducing valve, 47...
... Pressure valve, 48 ... Pressure valve, 49 ... Pressure valve, 5
0... Pressure release valve, 51... Pressure reducing valve, 52... Pressurizing valve, 53... Pressurizing valve, 54... Pressurizing valve, 55...
Lance hose, 56...Control valve, 57...Pressure relief valve, 58...Pressure piping, A...Storage tank, B...Transportation gas, C...Reaction gas, D ...Fuel storage tank, E
...Raw material storage tank, F...Raw material storage tank. Patent applicant Sumitomo Metal Mining Co., Ltd.

Claims (1)

[Claims] In a device for supplying raw materials and fuel to a lance pipe provided in a settler section of a flash smelting furnace, there are a plurality of storage tanks for raw materials equipped with a cutting means and a conveying means, and a type or fuel that is cut and conveyed from these storage phases. A raw material supply hopper that collectively accommodates multiple types of raw material powder, a pressurized hopper connected to the lower part of the hopper via a valve, and a raw material flow that transports the raw material cut from the pressurized hopper in an air stream. a solid fuel powder storage tank comprising a conduit, a cutting means and a conveying means;
A fuel supply hopper that stores the fuel powder cut out from the storage tank and transported; a pressurized hopper connected to the lower part of the hopper via a valve; 1. A supply device for raw materials and fuel, comprising: a fuel flow pipe for transporting the raw material and the fuel, the raw material flow pipe and the fuel flow pipe being joined in front of a supply port of a lance pipe.