JPS6156432B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for recovering thermal energy from high temperature waste such as blast furnace slag.

Blast furnace slag is produced as a byproduct during the iron smelting process, and this amount is, for example, when producing 1 ton of iron.
A considerable amount is produced, about 0.3 tons, and when this blast furnace slag flows out of the blast furnace, it is at a high temperature of over 1100 degrees Celsius. However, conventionally, the large amount of thermal energy contained in this blast furnace slag has not been utilized in any way and has been dissipated into the atmosphere as it is.

The present invention has been made in view of the above circumstances, and provides a waste heat energy recovery device that can efficiently recover the thermal energy of high-temperature waste such as blast furnace slag as easily usable steady output electrical energy. The purpose is to provide.

An embodiment of the present invention will be described below with reference to the drawings. The waste heat energy recovery device in this embodiment includes a steam generation mechanism 1 that converts water into pressure steam using the thermal energy of blast furnace slag, and a steam turbine 2 that is driven by the pressure steam from the steam generation mechanism 1. And this steam turbine 2
It consists of an energy conversion mechanism 3 that converts the rotational output of 1 to potential energy, and a generator 4 that is driven by the potential energy generated by this energy conversion mechanism 3.

First, the steam generation mechanism 1 will be explained. An inlet 14 is formed in the ceiling 12 of the furnace body 11 and is opened and closed by a lid 13. Blast furnace slag flowing out from ) through a flow path 15 is introduced into the furnace body 11 . In addition, the furnace body 11
Openings that can be opened and closed by doors (not shown) are formed at the front and rear of each, and the cart 17 running on the rails 16 enters or exits the furnace body 11 through these openings. It is designed to be moved. Note that the furnace body 11, door, and lid 13 have a structure that can maintain high pressure. A header 18 having a plurality of nozzles is arranged below the ceiling 12 of the furnace body 11. This header 18
is connected to a water supply device (not shown) via a pipe 20 with a gate valve 19 interposed therebetween. In addition, 2
1 is a safety valve. The internal space of the furnace body 11 is connected to a gas purifier 23 via a steam extraction pipe 22. A gate valve 24, a strainer 25, and a solenoid valve 26 are interposed in the pipe 22, respectively. The solenoid valve 26 is opened and closed by a pressure switch 28 controlled by a pressure transmitter 27 connected within the furnace body 11. The gas purifier 23 consists of a high-pressure sealed tank filled to a predetermined height with water suitable for desulfurization, denitrification, and other impurity absorption, and the end of the pipe 22 is located in the water. There is. The upper space within the closed tank of the gas purifier 23 is connected to the steam turbine 2 via a steam pipe 29. A gate valve 30 and a check valve 31 are interposed in the pipe 29, respectively. Note that 32 is a water supply pipe in which a gate valve 33 is interposed, and 34 is a drain pipe in which a gate valve 35 is interposed.

In addition, the ceiling portion 12 of the furnace body 11, the side wall portions 36,
Piping 39 is embedded in 37 and bottom 38 . This pipe 39 is connected to a water supply device (not shown) via a water supply pipe 40 and to the steam turbine 2 via a steam extraction pipe 41. A solenoid valve 4 is installed in the pipe 41.
2 is interposed. This solenoid valve 42 is the solenoid valve 4
It is opened and closed by a pressure switch 44 controlled by a pressure transmitter 43 connected to a pipe 41 on the side closer to the furnace body 11 than the pressure switch 44 . Further, a pipe 45 is embedded inside the truck 17. One end of this pipe 45 is connected to the water supply pipe 40 via a snap joint 46, and the other end is connected to the steam extraction pipe 41 via a snap joint 47. There is.

Next, the energy conversion mechanism 3 will be explained. An output shaft 51 of the steam turbine 2 is connected to a rotating drum 54 via a reduction gear mechanism 52 and a clutch 53. One end of a rope 55 is wound around this drum 54. The other end of the rope 55 is suspended via pulleys 56 and 57, and a heavy peg 58 is attached to the tip. Further, the rotating drum 54 is connected to the generator 4 via a clutch 59 and a speed increasing mechanism (rotation control mechanism) 60.

Next, the operation of the waste heat energy recovery device having the above configuration will be explained. First, move the trolley 17 to the furnace body 11.
The piping 45 is arranged at a location below the lid 13 within the lid 13, and the piping 45 is connected to the water supply piping 40 and the steam extraction piping 41 through snap joints 46 and 47, respectively. Next, a predetermined amount of blast furnace slag is loaded onto the trolley 17 through the inlet 14, and then the lid 1
3 and the like to seal the inside of the furnace body 11. Next, water is sprayed from the header 18 through the nozzle onto the blast furnace slag on the truck 17, and water is supplied to the pipes 39 and 45 via the pipe 40. Then, the water sprinkled on the blast furnace slag is converted into steam by the heat of the blast furnace slag, thereby increasing the pressure inside the furnace body 11. When the pressure inside the furnace body 11 reaches a predetermined value, the pressure transmitter 27 detects this pressure, which activates the pressure switch 28 and opens the solenoid valve 26. Pressure steam containing
3, where the pressurized steam heats the water in the closed tank. Along with this, pressure steam containing no impurities is generated from the tank, and this pressure steam is introduced into the steam turbine 2 via the pipe 29 to drive it. On the other hand, the water in the pipes 39 and 45 is heated and converted into steam by the heat of the blast furnace slag being transferred through the walls, etc., and thereby the water in the pipe 41 connected to these pipes 39 and 45 is The pressure inside increases. And piping 4
When the pressure inside 1 reaches a predetermined value, the pressure transmitter 43 detects this pressure and the pressure switch 4 is activated.
4 is activated to open the electromagnetic valve 42, whereby the pressure steam in the pipes 39 and 45 is introduced into the steam turbine 2 via the pipe 41 to drive it.

In this way, the heat of the blast furnace slag in the furnace body 11 is effectively used to drive the steam turbine 2, and the rotation of the output shaft 51 of the steam turbine 2 is appropriately slowed down by the speed reduction mechanism 52. After that, it is transmitted to the rotating drum 54 via the clutch 53. Note that the clutch 59 is disengaged at this time. Then, as the rotary drum 54 rotates forward, the rope 55 is wound, and the heavy peg 58 is thereby raised. That is, the rotational output of the output shaft 51 is stored as potential energy of the heavy shaft 58. Therefore, when the temperature of the blast furnace slag in the furnace body 11 falls and the pressure inside the furnace body 11 and the pipe 41 drops below a predetermined pressure, the pressure transmitters 27 and 43 detect the pressure drop. Pressure switch 28, 4
4 is activated and the solenoid valves 26 and 42 are closed. As a result, the supply of pressure steam to the steam turbine 2 is stopped and the steam turbine 2 is stopped, and at the same time, the clutch 53 is disengaged and the clutch 59 is connected. Then, the heavy plow 58 moves downward due to its own weight, and along with this, the rotating drum 54 rotates in the opposite direction.
The rotational force of No. 4 is transmitted to the speed increasing mechanism 60 via the clutch 59.
After being increased in speed, the power is transmitted to the generator 4, and the generator 4 is driven to rotate at a constant speed. Here, in the present invention, in order to lower the heavy john 58 at a constant speed and rotate the generator 4 at a constant speed, the heavy john 58 is lowered at a constant speed to rotate the generator 4 at a constant speed.
The speed increase rate of the speed increase mechanism 60 is determined in advance according to the weight of the generator 8 and the force required to rotate the generator 4. That is, although the rotation of the steam turbine 2 is at high speed immediately after water is sprinkled on the blast furnace slag,
As the temperature of the blast furnace slag gradually decreases, it is very difficult to use as energy, but in the present invention, the rotation of the steam turbine 2 is once converted into potential energy of the heavy slag 58 and stored.
Thereafter, the potential energy of this heavy peg 58 is converted into stationary electrical energy that is easy to use.

When the temperature of the blast furnace slag in the furnace body 11 decreases and it becomes impossible to obtain predetermined pressure steam, the doors (not shown) are opened and the snap joints 46 and 47 are removed. The cart 17 is moved to the outside of the furnace body 11 and the cooled blast furnace slag is discharged to a predetermined location. Incidentally, the blast furnace slag thus discharged may be pulverized by the descending heavy hammer 58.

Note that in the above embodiment, the heavy plow 58 is lowered immediately after being raised, but after the heavy plow 58 is raised, it is held at the raised position, and then lowered by the necessary amount when necessary to generate electrical energy. It may be converted to , and is not limited to the above embodiment.

Further, in the above embodiment, the heavy slag 58 is raised and lowered only once for each process from loading the blast furnace slag onto the cart 17 to taking it out as pressure steam, but this is not limited to this. For example, using the energy of multiple times of the above process to
8 may be raised, and then the heavy peg 58 may be lowered all at once.

Furthermore, in the above embodiment, one steam generation mechanism 1 includes a steam turbine 2 and a heavy shaft 58.
However, the present invention is not limited to this, and a plurality of steam turbines 2 and a plurality of heavy shafts 58 may be provided for one steam generation mechanism 1. On the other hand, one steam turbine 2 and one heavy hoist 58 may be provided.

In addition, in the above embodiments, the case where blast furnace slag was used as the waste was explained, but the present invention is not limited to this, and it goes without saying that other wastes may be used.

As explained above, according to the waste heat energy recovery device according to the present invention, water is introduced into high-temperature waste and extracted as pressure steam, and the steam turbine is driven by this pressure steam, and then the steam turbine is rotated. The output is stored as the potential energy of the heavy plow, and the generated electricity is driven to rotate at a constant speed via the rotation control mechanism using the potential energy of the heavy plow, so the thermal energy of the waste can be easily utilized. This has the advantage of being able to efficiently recover electrical energy.

[Brief explanation of the drawing]

The drawing is a schematic diagram showing an embodiment of the waste heat energy recovery device according to the present invention. 1... Steam generation mechanism, 2... Steam turbine, 3... Energy conversion mechanism, 4... Generator,
11...Furnace body, 17...Dolly, 20, 39, 45
... Piping, 22, 41 ... Piping for steam extraction, 23
...Gas purifier, 26,42...Solenoid valve, 2
7, 43...Pressure transmitter, 28, 44...Pressure switch, 29...Steam piping, 52...Deceleration mechanism,
53, 59...Cratsuchi, 58...Jujo, 60...
...Speed-up mechanism (rotation control mechanism).

Claims (1)

[Claims] 1. A steam generation mechanism that leads high-temperature waste into a high-pressure container and directly sprinkles water on it to generate pressure steam;
a steam turbine driven by pressure steam from the steam generation mechanism; an energy conversion mechanism that converts the rotation of the output shaft of the steam turbine into potential energy of a heavy hammer; and a rotation control mechanism using the potential energy of the heavy hammer. A waste heat energy recovery device characterized by comprising a generator that is rotated at a constant speed via a generator.