WO2013168655A1

WO2013168655A1 - Slag heat recovery device

Info

Publication number: WO2013168655A1
Application number: PCT/JP2013/062701
Authority: WO
Inventors: 徹池▲崎▼; 大平　尚; 悦郎野田; 裕信石川; 勉大木
Original assignee: 新日鉄住金エンジニアリング株式会社; Nsプラント設計株式会社
Priority date: 2012-05-07
Filing date: 2013-05-01
Publication date: 2013-11-14
Also published as: JP2013234774A

Abstract

The present invention is equipped with: a pool (1) in which water is stored; a cylindrical container (2) which is erected in the pool and an upper-end opening of which is covered, while a lower-end aperture (3) is submerged in the open state in the water; a molten slag (S1) inflow port (12) provided in the ceiling wall (8) of the cylindrical container; a slag heat recovery chamber (2A), which is defined within the cylindrical container and the upper part of which forms a steam chamber (4) that accumulates steam while the lower part forms a water seal chamber (5) that holds water, thereby preventing the escape of the steam in the steam chamber, and which brings the water into contact with the molten slag flowing in from the inflow port, thereby producing solidified slag through cooling and causing the solidified slag to settle in the water in the water seal chamber, and generating steam; a steam extraction port (7) that extracts the steam in the steam chamber to the outside; a slag transfer conveyor (30) that receives and transfers the slag that has settled in the water in the water seal chamber; and a spray nozzle (6) that sprays water (W) onto the molten slag flowing in from the inflow port, thereby water-granulating the slag.

Description

Slag heat recovery device

The present invention relates to a slag heat recovery apparatus that recovers heat of slag generated in a blast furnace or a converter and generates steam.
This application claims priority based on Japanese Patent Application No. 2012-105933 for which it applied to Japan on May 7, 2012, and uses the content here.

The thing of patent document 1 is known as a conventional slag heat recovery apparatus.
This slag heat recovery device pours molten slag into a sealed tank through a gate, scatters the molten slag by a rotating body in the tank, and contacts the water in the tank, thereby cooling the slag and granulating it At the same time, steam is generated and the turbine is rotated by the energy of the steam to generate electricity. The granulated slag is taken out by opening and closing a two-stage gate at the bottom of the sealed tank.

Japanese Patent Publication No.62-1200

In the slag heat recovery device described in Patent Document 1, a two-stage gate is provided at the lower part of the sealed tank to prevent the pressure in the tank from escaping. Due to reliability problems, the steam pressure in the tank had to be kept as low as about 1.5 atm. Therefore, when power was generated with the generated steam, the power generation efficiency could not be increased. Moreover, since the granular slag is clogged in the gap between the gates, the gate may not be completely closed, resulting in a decrease in pressure in the tank.

In view of the above circumstances, an object of the present invention is to provide a slag heat recovery device that can increase the efficiency of heat recovery from slag and generate high-pressure steam.

The present invention includes a pool in which water is stored, a cylindrical container that is erected in the pool, the upper end opening is closed, and the lower end opening is submerged in an open state in water, and an upper part of the cylindrical container. The molten slag inlet provided and the inside of the cylindrical container are defined, the upper part is a steam chamber in which steam stays, and the lower part seals out the steam from the steam chamber by retaining water. A slag heat recovery chamber that is a water-sealed chamber and that generates water by bringing water into contact with the molten slag flowing from the inflow port to produce solidified slag by cooling and settling in the water in the water-sealed chamber. A steam outlet for taking out the steam in the steam chamber to the outside, and receiving the slag that has flowed in from the inlet and solidified and settled in the water in the water sealed chamber from the lower end opening of the cylindrical container, and other places And a slag transfer mechanism That.
Thereby, since the cylindrical container standing in the pool is water-sealed although the lower end is open, there is no possibility that the steam escapes with the discharge of the slag through the lower end opening. Accordingly, the pressure of the steam in the steam chamber can be increased, and high-pressure steam can be taken out to the outside. Therefore, power generation efficiency can be increased by using the energy of the steam for power generation. Moreover, since the lower end of the cylindrical container which is a discharge port of slag is always open, slag is not clogged. In addition, slag falls into the water in the watertight chamber of the cylindrical container, soaks and gradually settles and accumulates, so that the accumulated slag is transported from the lower layer through the lower end opening of the cylindrical container. It can be discharged by the mechanism. In this way, slag can be discharged from the bottom in accordance with the sedimentation of slag from above, so that solid slag and steam can be generated continuously and stable operation is possible. Become.

In the present invention, a spray nozzle that sprays spray water on the molten slag flowing from the inlet and slags the slag and generates steam may be provided on the upper part of the cylindrical container.
Thereby, since heat recovery from the molten slag can be performed by spraying spray water and immersing in water, it is possible to improve the heat recovery rate. That is, the sensible heat and latent heat of the molten slag can be recovered to the maximum to generate a large amount of water vapor. Moreover, a high quality granulated slag can be made by rapidly cooling the molten slag with spray water.

In the present invention, water in the water-sealed chamber may be taken out and supplied to the spray nozzle.
Thereby, the water in the water seal chamber becomes hot water by immersing the slag, and since the hot water is used as spray water, the steam generation efficiency can be increased.

In the present invention, the slag transport mechanism may continuously discharge the slag that has settled and stayed in the water-sealed chamber from its lower layer while maintaining the laminated state of the slag.
As a result, the slag transport mechanism continuously discharges the slag from the lower layer while maintaining the laminated state of the slag accumulated in the water in the water sealed chamber, so that stable operation without breaking the stable state in the water sealed chamber is possible. Can proceed.

In the present invention, the inflow port is formed in a ceiling wall that closes the upper end opening of the cylindrical container, and a slag pot housing chamber that can be sealed by a lid is disposed on the upper side of the ceiling wall. When a slag pot containing molten slag is set inside the slag pot accommodating chamber at the lower part of the container chamber, the discharge port at the lower part of the slag pot communicates with the inlet, and the molten slag in the slag pot A slag inflow passage leading to the inlet and a gate for opening and closing the slag inflow passage, while introducing the pressure of the steam chamber into the slag pan housing chamber with the lid on the slag pan housing chamber By doing so, the communicating path which makes the slag pot accommodation chamber the same pressure as the said steam chamber may be connected, and the on-off valve may be provided in the said communicating path.
Thereby, before opening the gate of the lower part of a slag pot accommodating chamber, the blowing of the vapor | steam at the time of opening a gate can be prevented by making the pressure in a slag pot accommodating chamber the same pressure as a steam chamber. Therefore, the steam chamber can be maintained at a high pressure and safe operation can be promoted.

In the present invention, a double wall nozzle comprising an outer tube and an inner tube is provided on a ceiling wall that closes an upper end opening of the cylindrical container, and an inlet of the molten slag is provided by an inner tube passage of the double tube nozzle. A spray water injection port configured to spray the spray water onto the molten slag flowing from the inflow port to slag the slag and generate steam, and is configured by an outer tube passage of the double tube nozzle. Also good.
Thereby, since spray water is injected together with molten slag using a double tube nozzle, the slag can be rapidly cooled and steam can be generated efficiently.

In the present invention, the spray of steam from the steam chamber through the inflow port to the outside of the cylindrical container may be sealed by spraying spray water from the spray water spray port.
Thereby, since the spray of the steam through the inflow port is sealed by the spray of the spray water from the outer tube inner passage of the double tube nozzle, the steam chamber can be maintained at a high pressure. Moreover, since the negative pressure can be generated on the outlet side of the inlet by spraying the spray water, the inflow of the molten slag can be promoted.

In the present invention, a double wall nozzle comprising an outer tube and an inner tube is provided on a ceiling wall that closes an upper end opening of the cylindrical container, and an inlet of the molten slag is provided by a passage in the outer tube of the double tube nozzle. Even if the spray water injection port configured to spray the spray water to the molten slag flowing from the inflow port to slag the slag and generate the steam is constituted by the inner tube passage of the double tube nozzle Good.
Thereby, since spray water is injected together with molten slag using a double tube nozzle, the slag can be rapidly cooled and steam can be generated efficiently.

In the present invention, spray water is sprayed on the molten slag flowing from the inlet formed by the passage in the outer pipe of the double pipe nozzle on the upper part of the cylindrical container to slag the slag and generate steam. A spray nozzle may be provided, and the spray of steam from the steam chamber through the inlet to the outside of the cylindrical container may be sealed by spraying spray water from the spray nozzle.
As a result, by spraying the spray water from the spray nozzle to the molten slag flowing from the inlet, the steam blowout through the inlet is sealed, so that the steam chamber can be maintained at a high pressure.

In the present invention, a crusher for mechanically crushing the settled slag may be provided in the water seal chamber.
Thereby, since the crusher is provided in the water-sealed chamber, the slag falling into the water can be finely pulverized. Therefore, the transfer of heat from the slag to water can be promoted by increasing the surface area of the slag immersed in water.

The present invention may be provided with a power generation device that rotates a turbine with the energy of the steam taken out from the steam outlet and generates power.
Thereby, since the generated high-pressure steam is used for power generation, the heat held by the slag can be effectively used.

In the present invention, the steam taken out from the steam outlet may be directly introduced into the turbine via a cleaning means and a pressure equalizing tank.
Thereby, the phenomenon that a turbine blade, a bearing, etc. are damaged by dust etc. can be reduced. Moreover, since it goes through the pressure equalizing tank, the turbine can be operated stably.

In the present invention, the steam energy taken out from the steam outlet may be converted into air energy and introduced into the turbine.
Thereby, since the energy of the steam taken out from the steam outlet is converted into air energy and introduced into the turbine, the phenomenon that the turbine blades and the bearings are damaged by the dust contained in the steam can be reduced.

According to the present invention, it is possible to provide a slag heat recovery device capable of increasing the efficiency of heat recovery from slag and generating high-pressure steam.

It is a block diagram of the slag heat recovery apparatus of 1st Embodiment of this invention. It is a block diagram of the vapor | steam pressure-pneumatic pressure conversion apparatus used for the modification of the apparatus. It is a principal part block diagram of the slag heat recovery apparatus of 2nd Embodiment of this invention. It is a figure which shows the variation of the double rod nozzle used for the same apparatus. It is a figure which shows the variation of the double rod nozzle used for the same apparatus. It is a figure which shows the variation of the double rod nozzle used for the same apparatus. It is a figure which shows the variation of the double rod nozzle used for the same apparatus. It is a principal part block diagram of the slag heat recovery apparatus of 3rd Embodiment of this invention. It is a schematic block diagram of the common part of the slag heat recovery apparatus of each said embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
<First Embodiment>
FIG. 1 is a configuration diagram of a slag heat recovery apparatus according to the first embodiment.

This slag heat recovery device includes a pool 1 in which water is stored, and a cylindrical container which is erected in the pool 1 and whose upper end opening is closed by a ceiling wall 8 and whose lower end opening 3 is immersed in water in an open state. 2, the inlet 12 of the molten slag S1 provided on the ceiling wall 8, the slag pot accommodating chamber 20 installed on the upper side of the ceiling wall 8 of the cylindrical container 2, and the steam generated in the cylindrical container 2 are used. And a power generation device 50 for generating power. In the slag pot accommodating chamber 20, the slag pot 10 containing the molten slag S1 is set.

The inside of the cylindrical container 2 is a slag heat recovery chamber 2A. The upper portion of the slag heat recovery chamber 2A is a steam chamber 4 where the steam W2 stays, and the lower portion of the steam chamber 4 is due to the retention of water. A water-sealed chamber 5 is provided to seal the vapor from the lower end opening 3. In the slag heat recovery chamber 2A, water is brought into contact with the molten slag S1 flowing in from the inlet 12, thereby cooling the molten slag S1, thereby generating solidified slag S2, So that the slag S2 is allowed to settle. At the same time, steam is generated by water in contact with the hot slag.

In the upper part of the cylindrical container 2, a steam outlet 7 for taking out the steam W2 in the steam chamber 4 to the outside, and spray water Ws is sprayed on the molten slag S1 flowing in from the inlet 12, and the molten slag S1 is granulated. In addition, a spray nozzle 6 that generates steam is provided. The water supplied to the spray nozzle 6 may be taken in from the pool 1, the power generation device, or outside the system, but in this embodiment, the water (hot water) in the water seal chamber 5 taken out from the outlet 9 is removed by the pump 60. It is used in circulation.

Also, the pool 1 is provided with a slag transfer conveyor (slag transfer mechanism) 30. The slag transport conveyor 30 receives the granular slag S2 that has flowed from the inlet 12 and solidified and settled in the water in the water-sealed chamber 5 from the lower end opening 3 of the cylindrical container 2 to the pit 40 outside the pool 1. Transport.

The slag conveyor 30 is configured so that the granular slag S2 that has settled and stayed in the water in the water seal chamber 5 can be continuously discharged from its lower layer while maintaining the laminated state of the slag S2. ing. The slag transfer conveyor 30 is located immediately below the lower end opening 3 of the cylindrical container 2 and receives the slag S2 discharged from the lower end opening 3, and the slag received by the first horizontal transfer unit 31 It has the vertical conveyance part 32 which lifts S2 upward, and the 2nd horizontal conveyance part 33 which drops the lifted slag S2 to the pit 40. Here, the first horizontal conveyance unit 31 is arranged immediately below the lower end opening 3 of the cylindrical container 2 at an appropriate interval, so that the laminated state of the slag S2 is maintained and the first horizontal conveyance unit 31 continues from the lower layer portion. In particular, the slag S2 is conveyed.

The slag pot storage chamber 20 installed on the upper side of the ceiling wall 8 of the cylindrical container 2 has a storage chamber main body 21 whose upper surface is opened so that the slag pot 10 can be taken in and out from above, and a lid 22 that closes the upper surface and seals the inside. And have. Thereby, the slag pan 10 containing the molten slag S <b> 1 can be set inside the cylindrical container 2.

When the slag pot 10 containing the molten slag S1 is set in the slag pot accommodating chamber 20 at the lower part of the slag pot accommodating chamber 20, the outlet at the lower part of the slag pot 10 and the inlet 12 are communicated. An inflow path 11 that guides the molten slag S1 in the slag pan 10 to the inlet 12 is provided. The inflow path 11 is provided with a gate 11G. The slag pot accommodating chamber 20 is connected to the slag pot accommodating chamber 20 with the same pressure as that of the steam chamber 4 by introducing the pressure of the steam chamber 4 into the slag pot accommodating chamber 20 with the lid 22 in place. 23 is connected. An open / close valve 24 is provided in the communication path 23.

Further, a crusher (not shown) for mechanically crushing the settled slag S2 is provided in the water seal chamber 5 as necessary. By finely pulverizing the slag S2 with this crusher, the surface area of the slag can be increased and the transfer of heat from the slag S2 to water can be promoted.

On the other hand, the power generation device 50 is configured to generate power with the generator 54 by turning the turbine 53 with the energy of the steam W2 taken out from the steam outlet 7. Here, the steam W <b> 2 taken out from the steam outlet 7 is introduced into the turbine 53 through the dust catcher (cleaning means) 51 and the pressure equalizing tank 52. Note that the steam used in the turbine 53 is stored in the tank 55 in the form of water, and is supplied to the pool 1 as necessary. Further, in order to keep the water in the pool 1 constant, makeup water is supplied to the tank 55 as necessary.

Next, the operation will be described.
Here, the steam chamber 4 is already filled with high-pressure steam, and a state in which granular slag S2 is accumulated to some extent in the water in the water-sealed chamber 5 will be described. When setting a new slag pot 10 from this state, the lower gate 11G of the slag pot accommodating chamber 20 is closed, and the slag pot 10 containing the molten slag S1 is set in the slag pot accommodating chamber 20. To do. Next, the lid 22 is closed, the open / close valve 24 of the communication passage 23 is operated, the pressure of the steam chamber 4 is introduced into the slag pot accommodating chamber 20, and the inside of the slag pot accommodating chamber 20 is the same as the steam chamber 4. Pressure.

In this state, the gate 11G is opened, and the molten slag S1 in the slag pan 10 is caused to flow into the cylindrical container 2 from the inlet 12. Then, the molten slag S1 that has flowed is rapidly cooled by spraying the spray water Ws, crushed, dropped into the water in the water seal chamber 5, and further cooled by being immersed in water. Steam W2 is generated in the course of this cooling, and the steam W2 is led from the steam outlet 7 to the power generation device 50 and used for power generation.

On the other hand, the granular slag S2 that has fallen into the water in the water-sealed chamber 5 settles in the water, and is transported to the pit 40 by the slag conveyor 30 in order from the slag S2 accumulated in the lower layer.

According to the slag heat recovery apparatus of the embodiment operated in the above flow, the heat held by the molten slag S1 can be efficiently recovered and the high-pressure steam W2 can be generated. That is, the cylindrical container 2 erected in the pool 1 is water-sealed although the lower end is open, so that there is no possibility that steam will escape with the discharge of the slag S2 through the lower end opening 3. Accordingly, the pressure of the steam in the steam chamber 4 can be increased, and the high-pressure steam W2 can be taken out. For example, high-pressure steam corresponding to the height L from the water surface around the cylindrical container 2 submerged in water to the water surface in the water-sealed chamber 5 can be held. Therefore, power generation efficiency can be increased by using the energy of the steam for power generation. Moreover, since the lower end of the cylindrical container 2 which is the discharge port of the slag S2 is always open, the slag S2 is not clogged.

Moreover, since the slag S2 falls and dipped from above into the water sealed chamber 5 of the cylindrical container 2 and gradually settles and accumulates, the accumulated slag S2 is transferred from the lower layer to the cylindrical container 2. It can be discharged by the slag conveyor 30 through the lower end opening 3. As described above, the retained slag S2 can be continuously discharged from the lower layer portion in accordance with the sedimentation of the slag S2 from above while maintaining the stacked state of the slag S2 retained in the water in the water seal chamber 5. Therefore, without destroying the stable state in the water-sealed chamber 5, the generation of slag S2 and the generation of steam can be performed continuously, and stable operation can be promoted.

Further, according to the slag heat recovery device of this embodiment, heat recovery from the molten slag S1 can be performed by spraying spray water on the molten slag S1 and immersing the molten slag S1 in water. The recovery rate can be improved. That is, a large amount of water vapor can be generated by recovering the sensible heat and latent heat of the molten slag S1 to the maximum extent. Moreover, the high quality granulated slag S2 can be made by rapidly cooling the molten slag S1 with spray water. In particular, since the hot water in the water-sealed chamber 5 is used as spray water, the steam generation efficiency can be increased.

Further, according to the slag heat recovery device of this embodiment, the pressure in the slag pot accommodating chamber 20 is set to the same as that of the steam chamber 4 via the communication path 23 before opening the gate 11G at the lower part of the slag pot accommodating chamber 20. By using the pressure, it is possible to prevent the steam from being blown up when the gate 11G is opened. Therefore, the inside of the steam chamber 4 can be maintained at a high pressure, and safe operation can be promoted.

Further, since the steam W2 taken out from the steam outlet 7 is introduced into the turbine 53 via the dust catcher 51 and the pressure equalizing tank 52, the phenomenon that the turbine blade and the bearing are damaged by dust or the like can be reduced. Further, since the steam W2 passes through the pressure equalizing tank 52, the turbine 53 can be stably operated.

In the slag heat recovery apparatus of this embodiment, the case where the purified steam W2 is directly introduced into the turbine 53 of the power generation apparatus 50 has been shown. However, the steam energy is transmitted to the air, and the air receives the energy. Can also be supplied to the turbine 53.

<Modification>
FIG. 2 shows a configuration of a vapor pressure-air pressure conversion device 70 that converts the vapor pressure into air pressure.
The vapor pressure-air pressure conversion device 70 has a plurality of conversion containers 71A to 71C for converting the pressure of high-pressure steam into air pressure as a main component. The conversion containers 71A to 71C are divided into a vapor chamber 74 and an air chamber 75 by a movable partition wall (diaphragm or the like) 72. A steam inlet line 83 and a steam outlet line 84 are connected in parallel to the steam chambers 74 as valves 81 on the steam side via

valves

87 and 88, respectively. In addition, an air introduction line 85 and an air lead-out line 86 are connected in parallel to the air chambers 75 as valves 82 on the air side through the

valves

87 and 88, respectively.

According to this vapor pressure-pneumatic pressure conversion device 70, the

valves

87 and 88 are operated in order to introduce high-pressure steam into the respective steam chambers 74 from the steam introduction line 83 and discharge it from the steam outlet line 84. Is introduced into each air chamber 75 from the air introduction line 85 and discharged from the air outlet line 86, whereby the pressure of the vapor can be transmitted to the air via the movable partition wall 72. Then, by introducing the high-pressure air taken out from the air lead-out line 86 to the turbine 53, the turbine 53 can be rotated to generate electric power without bringing the steam into direct contact with the turbine 53.

<Second Embodiment>
FIG. 3 is a configuration diagram of a main part of the slag heat recovery device of the second embodiment.
In this slag heat recovery device, the double wall nozzle N1 composed of the outer tube 102 and the inner tube 110 is provided on the ceiling wall 8 that closes the upper end opening of the cylindrical container 2, and the inlet 114 of the molten slag S1 is It is constituted by a lower end opening of a passage in the inner pipe 110 of the double pipe nozzle N1. Further, a spray water injection port 104 for spraying spray water Ws to the molten slag S1 flowing from the inflow port 114 to break up the slag and generate steam is provided in the passage 103 in the outer tube 102 of the double tube nozzle N1. It is configured by an annular opening (a gap between the outer tube 102 and the inner tube 110).

In this case, the spray water injection port 104 communicates with an annular water injection chamber 101 secured between the ceiling wall 8 of the cylindrical container 2 and a partition wall 100 formed on the lower side thereof. When water is introduced into the water injection chamber 101 from the water conduit 106, the water passes through the passage between the outer tube 102 and the inner tube 110 (passage 103 in the outer tube 102), and is a spray water injection port. The molten slag S1 is cooled as it hits the molten slag S1 that is sprayed downward as spray water Ws 104 from the inlet 114 and flows into the cylindrical container 2 through the passage in the inner pipe 110.

In addition, a molten slag pit 120 for storing the molten slag S1 flowing down the slag trough 122 is provided on the upper side of the ceiling wall 8, and an inflow passage 121 extending from the lower end of the molten slag pit 120 is provided in two. It communicates with a passage in the inner pipe 110 of the heavy pipe nozzle N1.

In this slag heat recovery device, the molten slag S1 flows from the molten slag pit 120 through the passage in the inner pipe 110 of the double pipe nozzle N1 into the cylindrical container 2 from the inlet 114. On the other hand, water introduced into the water jet chamber 101 from the water conduit 106 is sprayed downward from the spray water jet port 104 through the gap between the outer pipe 102 and the inner pipe 110 (the passage 103 in the outer pipe 102). Sprayed as water Ws. As a result, the molten slag S1 flowing into the cylindrical container 2 from the inlet 114 is rapidly cooled by the spray water Ws, and granular granulated slag is generated and steam is generated. The granular slag is immersed in the water in the water-sealed chamber 5 so that the remaining heat further generates steam. When the molten slag S1 flowing in in this way is crushed by the spray water Ws, the spray water Ws seals the blowing of steam from the steam chamber 4 through the inlet 114 to the outside of the cylindrical container 2.

According to the slag heat recovery device of this embodiment, since the spray water Ws is injected together with the molten slag S1 using the double pipe nozzle N1, the molten slag S1 can be rapidly cooled and steam is efficiently generated. Can be made. Further, the spray of the spray water Ws from the passage in the outer tube 102 of the double tube nozzle N1 seals the steam blowout through the inflow port 114, so that the steam chamber 4 can be maintained at a high pressure. Moreover, since the negative pressure can be generated on the outlet side of the inflow port 114 by the spray of the spray water Ws, the inflow of the molten slag S1 can be promoted.

4A to 4D show another embodiment of the double tube nozzles NA to ND.
In the double tube nozzle NA of FIG. 4A, the lower end 102a of the outer tube 102 extends downward from the lower end of the inner tube 110 by a predetermined dimension Lm1 (= about 150 mm), and the extended portion becomes narrower as it goes downward. A tapered shape (taper angle θ1 = about 1.9 °) is formed. The lower end of the outer tube 102 having a diameter of 150 mm is narrowed to the spray water injection port 104 having a diameter of 140 mm.
The inner tube 110 has a diameter of 60 mm.

In the double tube nozzle NB of FIG. 4B, the lower end 110a of the inner tube 110 of FIG. 4A extends long downward by a predetermined dimension Lm2 (= about 50 mm), and the extended portion is tapered so as to go downward. (Taper angle θ2 = about 1.9 °). Therefore, the lower end of the inner pipe 110 having a diameter of 60 mm is an inlet 114 having a diameter of 50 mm.

When the lower end 102a of the outer pipe 102 is extended below the lower end 110a of the inner pipe 110 as in the double pipe nozzles NA and NB of FIGS. 4A and 4B, spray water is supplied to the molten slag S1 flowing from the inlet 114. It is possible to reliably make many contacts.

4C, the lower end 102a of the outer tube 102 and the lower end 110a of the inner tube 110 are set to the same length. The lower ends 102a and 110a are formed in a tapered shape (taper angle θ3 = about 1.9 °) that is narrowed downward by the same predetermined dimension Lm3 (= about 50 mm).

In the double tube nozzle ND of FIG. 4D, the taper (taper angle θ4 = about 1.9 °) of the lower end 102a of the outer tube 102 of FIG. 4C is outward.

By using these double tube nozzles NA to ND, it is possible to expect the suction effect of the molten slag S1. Moreover, the water sealing effect by the spray water Ws can be expected.

<Third Embodiment>
FIG. 5 is a configuration diagram of a main part of the slag heat recovery device of the third embodiment.
In the second embodiment, the passage in the inner pipe 110 of the double pipe nozzle N1 is a slag passage, and the passage in the outer pipe 102 is a spray water passage. The slag heat recovery apparatus of the third embodiment Then, although a similar double pipe nozzle N2 is provided on the ceiling wall 8 of the cylindrical container 2, contrary to the second embodiment, the passage in the inner pipe 142 of the double pipe nozzle N2 is used as a passage for the spray water Ws. The passage in the outer pipe 141 (the annular gap 143 between the outer pipe 141 and the inner pipe 142) is used as the passage for the molten slag S1. And the inflow port of molten slag S1 is comprised by the lower end of the channel | path (The cyclic | annular space | gap 143 between the outer pipe | tube 141 and the inner pipe | tube 142) in the outer pipe | tube 141 of the double pipe nozzle N2. Moreover, the spray water injection port is comprised by the lower end of the channel | path in the inner tube 142 of the double tube nozzle N2. The inner pipe 142 is inserted from the molten slag pit 120.

In addition, spray water Ws is injected into the inner pipe 142 of the double pipe nozzle N2 with respect to the molten slag S1 flowing from the inlet formed by the passage in the outer pipe 141 of the double pipe nozzle N2 in the upper part of the cylindrical container 2. In addition to spraying from the passage, spray water Ws is sprayed from the spray nozzle 6 installed in the steam chamber 4 to slag the slag and generate steam. The spraying of the spray water Ws from the passage in the inner pipe 142 of the double pipe nozzle N2 seals the blowout of steam through the passage in the outer pipe 141 that is the inflow port, so that the steam chamber 4 can be maintained at a high pressure. Moreover, since the negative pressure can be generated on the outlet side of the passage portion in the outer pipe 141 by the spraying of the spray water Ws, the inflow of the molten slag S1 can be promoted.

According to the slag heat recovery device of this embodiment, since the spray water Ws is injected from both the inner and outer surfaces to the molten slag S1 flowing from the passage in the outer tube 141 of the double tube nozzle N2, the molten slag S1 can be rapidly cooled and steam can be generated efficiently.

DESCRIPTION OF SYMBOLS 1 Pool 2 Cylindrical container 2A Slag heat recovery chamber 3 Lower end opening 4 Steam chamber 5 Water seal chamber 6 Spray nozzle 7 Steam outlet 8 Ceiling wall 9 Outlet 10 Slag pot 11 Inflow path 11G Gate 12 Inlet 20 Slag pot storage chamber 21 Containment chamber body 22 Lid 23 Communication path 24 Open / close valve 30 Slag conveyor (slag conveyor mechanism)
30A, 30B Slag conveyor 31 First horizontal conveyor 32 Vertical conveyor 33 Second horizontal conveyor 40 Pit 50 Power generator 51 Dust catcher (cleaning means)
52 Pressure equalizing tank 53 Turbine 54 Generator 55 Tank 60 Pump 70 Vapor pressure-air pressure conversion devices 71A to 71C Conversion vessel 72 Movable partition wall 74 Steam chamber 75 Air chamber 81 Steam side line 82 Air side line 83 Steam introduction line 84 Steam outlet line 85 Air inlet line 86

Air outlet lines

87 and 88 Valve 100 Partition wall 101 Water injection chamber 102 Outer pipe 102a Lower end 103 Passage 104 Spray water injection port 106 Water conduit 110 Inner pipe 110a Lower end 114 Inlet 120 Melting slag pit 121 Inflow Path 122 slag rod 141 outer pipe 142 inner pipe 143 gap 200 container H steam pressure 2H steam pressure W water W2 steam Ws spray water S1 molten slag S2 slag N1, N2, NA to ND double pipe nozzle

Claims

A pool of water,
A cylindrical container which is erected in the pool, the upper end opening is closed, and the lower end opening is immersed in water in an open state;
An inlet for molten slag provided at the top of the cylindrical container;
The inside of the cylindrical container is defined, and the upper part is a steam chamber in which steam stays, and the lower part is a water sealed chamber that seals out the steam from the steam chamber by retaining water, from the inlet A slag heat recovery chamber for generating steam by generating solidified slag by cooling and bringing it into the water in the water sealed chamber by bringing water into contact with the inflowing molten slag;
A steam outlet for taking out the steam in the steam chamber to the outside;
A slag transport mechanism that receives the slag that has flowed from the inlet and solidified and settled in the water in the water-sealed chamber from the lower end opening of the cylindrical container, and transports the slag to another place;
A slag heat recovery device comprising:
The slag heat recovery according to claim 1, wherein a spray nozzle that sprays spray water on the molten slag flowing from the inlet and slags the slag and generates steam is provided at an upper portion of the cylindrical container. apparatus.
The slag heat recovery device according to claim 2, wherein water in the water seal chamber is taken out and supplied to the spray nozzle.
4. The slag transport mechanism according to any one of claims 1 to 3, wherein the slag transport mechanism continuously discharges the slag that has settled and stayed in the water-sealed chamber from its lower layer while maintaining the laminated state of the slag. The slag heat recovery device described.
The inflow port is formed in a ceiling wall that closes an upper end opening of the cylindrical container;
On the upper side of the ceiling wall, a slag pot storage room that can be sealed by placing a lid is arranged,
When a slag pot containing molten slag is set inside the slag pot accommodating chamber at the lower part of the slag pot accommodating chamber, the discharge port at the lower part of the slag pot and the inflow port are communicated with each other. A slag inflow passage for guiding the molten slag to the inlet and a gate for opening and closing the slag inflow passage,
On the other hand, by introducing the pressure of the steam chamber into the slag pot accommodating chamber with the lid on the slag pot accommodating chamber, a communication path that connects the slag pot accommodating chamber to the same pressure as the steam chamber is connected, The slag heat recovery device according to any one of claims 1 to 4, wherein an open / close valve is provided in the communication path.
On the ceiling wall that closes the upper end opening of the cylindrical container, a double tube nozzle consisting of an outer tube and an inner tube is provided,
The inlet of the molten slag is constituted by an inner pipe passage of the double pipe nozzle;
The spray water injection port for spraying spray water onto the molten slag flowing from the inlet to slag the slag and generating steam is constituted by a passage in the outer tube of the double tube nozzle. The slag heat recovery device according to any one of 1 to 4.
The slag heat recovery apparatus according to claim 6, wherein spraying of steam from the steam chamber through the inflow port to the outside of the cylindrical container is sealed by spraying spray water from the spray water spray port.
On the ceiling wall that closes the upper end opening of the cylindrical container, a double tube nozzle consisting of an outer tube and an inner tube is provided,
The inflow port of the molten slag is constituted by a passage in the outer pipe of the double pipe nozzle;
The spray water injection port for spraying spray water to the molten slag flowing from the inflow port to smash the slag and generate steam is constituted by a passage in the inner pipe of the double pipe nozzle. The slag heat recovery device according to any one of 4.
A spray nozzle that sprays spray water on the molten slag flowing from the inlet formed by the outer pipe passage of the double tube nozzle to slag the slag and generate steam is provided on the upper part of the cylindrical container. The slag heat recovery apparatus according to claim 8, wherein spraying of steam from the steam chamber to the outside of the cylindrical container through the inflow port is sealed by spraying spray water from the spray nozzle.
The slag heat recovery device according to any one of claims 1 to 9, wherein a crusher for mechanically crushing the settled slag is provided in the water seal chamber.
The slag heat recovery device according to any one of claims 1 to 10, further comprising a power generation device that generates electricity by turning a turbine with energy of steam taken out from the steam outlet.
The slag heat recovery device according to claim 11, wherein the steam taken out from the steam outlet is directly introduced into the turbine via a cleaning means and a pressure equalizing tank.
The slag heat recovery device according to claim 11, wherein the steam energy taken out from the steam outlet is converted into air energy and introduced into the turbine.