WO2021124564A1

WO2021124564A1 - Steam curing device and desulfurizing agent production device

Info

Publication number: WO2021124564A1
Application number: PCT/JP2019/050151
Authority: WO
Inventors: 清宏堀内; 徹柳谷; 智基佐藤; 和浩黒澤; 智生粥川; 基裕山本; 美紀子倉本
Original assignee: 北海道電力株式会社; 日揮グローバル株式会社
Priority date: 2019-12-20
Filing date: 2019-12-20
Publication date: 2021-06-24
Also published as: CN114555222A

Abstract

[Problem] To seal a steam atmosphere inside a treatment container of a steam curing device via a simple configuration. [Solution] A steam curing device is configured so as to be provided with: a treatment container in which solid matter is steam cured; a steam supply part that supplies steam for curing the solid matter inside the treatment container; a supply passage that opens inside the treatment container and outside of the treatment container, and supplies the solid matter to the inside of the treatment container; and a gas discharge part that discharges gas in a direction intersecting the supply passage, enables the solid matter to pass through the supply passage, and seals a steam atmosphere inside the treatment container.

Description

Steam curing equipment and desulfurizing agent manufacturing equipment

The present invention relates to a steam curing device for steam curing a solid substance and a desulfurizing agent manufacturing device including the steam curing device.

Thermal power plants, coke ovens, etc. use coal or heavy oil as fuel and emit flue gas. Since coal and heavy oil contain sulfur compounds, the flue gas contains a large amount of sulfur oxides (SOx) as air pollutants. As an apparatus for removing this SOx, a desulfurization apparatus for desulfurizing flue gas by a mobile layer dry desulfurization method is known. In this desulfurization apparatus, granules of a purifying agent (desulfurizing agent) having desulfurization performance are used. The granules move down in the desulfurization tower to form a moving layer. Then, the flue gas flow is supplied so as to be orthogonal to the moving layer, and desulfurization is performed.

To briefly describe the above-mentioned process for producing a desulfurizing agent, first, water is added to a mixture of _{slaked lime (Ca (OH) 2} ), coal ash and gypsum (CaSO _{4) and kneaded.} Subsequently, the kneaded product is molded into granules to produce a desulfurizing agent. Then, this desulfurizing agent is cured by supplying water vapor. Patent Document 1 describes a system including a desulfurizing agent manufacturing facility and a desulfurizing apparatus. This desulfurization apparatus is an apparatus for performing desulfurization of the above-mentioned mobile layer dry desulfurization method, and the desulfurization agent manufacturing equipment includes a steam curing apparatus. The desulfurizing agent is cured by this steam curing device. The steam curing device is provided with a processing container, and the inside of the processing container has a steam atmosphere. A desulfurizing agent is carried into the processing container from the supply channel of the granules for curing.

In the above steam curing device, it is assumed that a drive mechanism such as a valve for opening and closing the supply path of the granules is provided in order to seal the steam atmosphere in the processing container. However, since providing the drive mechanism causes clogging of the supply path, the workload such as cleaning work at the time of inspection increases, the production efficiency of the desulfurizing agent decreases, and the reliability of the steam curing device is improved. It becomes a factor to damage. On the other hand, if water vapor leaks to the outside of the processing container with the supply path open without installing a drive mechanism, excess water vapor must be generated. The generation of excess water vapor makes the use of energy inefficient and increases the operating cost of the equipment.

Japanese Unexamined Patent Publication No. 02-115039

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a technique capable of sealing the steam atmosphere in a processing container in a steam curing device with a simple configuration.

The steam curing apparatus of the present invention includes a processing container for steam curing solids and a processing container.
A steam supply unit that supplies steam for processing the solid matter into the processing container,
A supply path that opens into the processing container and the outside of the processing container in order to supply the solid matter into the processing container.
A gas discharge unit that discharges gas in a direction intersecting the supply path in order to allow the solid matter to pass through the supply path and to seal the steam atmosphere in the processing container.
To be equipped.

According to the present invention, gas is discharged into a supply path for supplying a solid substance into the processing container in a direction intersecting the supply path. Thereby, the vapor atmosphere in the processing container is sealed. Therefore, it is not necessary to provide a drive mechanism such as a valve in the supply path. Therefore, the configuration of the steam curing device can be simplified.

It is a block diagram of the desulfurization system which concerns on this invention. It is a block diagram of the desulfurization agent manufacturing apparatus provided in the desulfurization system. It is a longitudinal side view of the steam curing apparatus which constitutes the desulfurizing agent production apparatus. It is a cross-sectional plan view of the supply path of the granular material in the steam curing apparatus. It is a longitudinal side view of the supply path of the granular material. It is a longitudinal front view of the supply path of the granular material. It is a longitudinal side view of the supply path which constitutes the steam curing apparatus of the comparative example. It is a vertical sectional side view of the supply path of the said granular material which concerns on another structural example. It is a longitudinal side view which shows still another structural example of the said steam curing apparatus.

FIG. 1 is a configuration diagram showing a desulfurization system 1 according to an embodiment of the present invention. The desulfurization system 1 includes a desulfurization agent production facility 2 which is a desulfurization agent production apparatus, and a desulfurization apparatus 3. The desulfurizing agent manufacturing facility 2 manufactures and cures the desulfurizing agent. Then, the cured desulfurizing agent is transported from the desulfurizing agent manufacturing facility 2 to the desulfurizing apparatus 3. The desulfurization apparatus 3 uses the desulfurization agent to perform desulfurization by a mobile layer dry desulfurization method.

The desulfurization apparatus 3 includes a first desulfurization tower 31, a second desulfurization tower 32,

storage units

30 and 36, and a flow path forming member 33. The first desulfurization tower 31 and the second desulfurization tower 32 are arranged at intervals in the front-rear direction. The cured desulfurizing agent is transported from the desulfurizing agent manufacturing facility 2 to the storage unit 30, once stored, and then sequentially transported to the second desulfurization tower 32 and the first desulfurization tower 31. Valves 31A and 32A are provided in the lower part of the first desulfurization tower 31 and the lower part of the second desulfurization tower 32, respectively. In each of the first desulfurization tower 31 and the second desulfurization tower 32, the desulfurizing agent is lowered by its own weight at a speed corresponding to the opening degree of the valves 31A and 32B. Due to the drop of the desulfurizing agent, a moving layer is formed in the first desulfurization tower 31 and the second desulfurization tower 32. The desulfurizing agent discharged from the first desulfurizing tower 31 is temporarily stored in the storage unit 36 as a used desulfurizing agent. After that, the used desulfurizing agent is transported to the desulfurizing agent manufacturing facility 2.

The flow path forming member 33 forms a flow path for the flue gas. This flow path is formed so that the flue gas passes through the first desulfurization tower 31 and the second desulfurization tower 32 in this order. The flow path forming member 33 is provided with an inflow port 34 and an outflow port 35. The inflow port 34 is connected to the flow path of the flue gas of the flue gas source, and the flue gas source is, for example, a thermal power plant. The outflow port 35 discharges the flue gas discharged from the second desulfurization tower 32 to the subsequent equipment.

The flow of flue gas will be further described. In each of the first desulfurization tower 31 and the second desulfurization tower 32, the flue gas flows in from one side surface (front surface) and flows out from the other side surface (rear surface). Therefore, the flue gas flow is orthogonal to the moving layers of the first desulfurization tower 31 and the second desulfurization tower 32. At such orthogonality, SOx in the flue gas reacts with calcium hydroxide in the desulfurizing agent and is fixed as calcium sulfate. That is, desulfurization is performed. In addition, in this embodiment, orthogonality is not limited to intersecting vertically, but also includes intersecting at 45 degrees or more and 90 degrees or less.

Subsequently, the desulfurizing agent manufacturing facility 2 will be described with reference to FIG. The desulfurization agent manufacturing equipment 2 includes a crusher 20, storage units 21 to 23, measuring instruments 21B to 23B, a mixer 24, a storage unit 25, a kneading machine 26, an extrusion molding machine 27, and a steam curing device. 4 and a dryer 28 are provided.

A used desulfurizing agent is supplied to the crusher 20 from the storage unit 36 of the desulfurization apparatus 3, and the crushing machine 20 crushes the used desulfurizing agent. The crushed used desulfurizing agent is stored in the storage unit 21. The

storage units

22 and 23 store slaked lime and coal ash, respectively.

Discharge valves

21A, 22A, and 23A are provided at the lower ends of the

storage portions

21, 22, and 23, respectively, and measuring

instruments

21B, 22B, and 23B are provided below the

discharge valves

21A, 22A, and 23A, respectively. Has been done. Used desulfurization agent, slaked lime and coal ash are weighed by measuring

instruments

21B, 22B and 23B, respectively. Then, the used desulfurization agent, slaked lime and coal ash, which are weighed respectively, are supplied to the mixer 24. In the mixer 24, a mixture of used desulfurization agent, slaked lime and coal ash is produced, and the mixture is temporarily stored in the storage unit 25.

The mixture in the storage unit 25 is discharged from the discharge valve 25A on the lower side of the storage unit 25 and supplied to the kneader 26. In the kneader 26, water is added to the mixture and kneaded to produce a kneaded product. The kneaded product is supplied to the extrusion molding machine 27. The kneaded product is molded by the extrusion molding machine 27 to become granules 40 (not shown in FIG. 2) which is a desulfurizing agent. Therefore, the storage units 21 to 23, the measuring instruments 21B to 23B, the mixer 24, the storage unit 25, the kneading machine 26, and the extrusion molding machine 27 constitute a granulation unit 29 for granulating the granules 40 which are desulfurizing agents. To do.

The granules 40 are transported to the steam curing device 4. The granular material 40 is cured by being heated in a steam atmosphere in the steam curing device 4. The cured granules 40 are transported to the dryer 28. As the granules 40 after being dried by the dryer 28, those having a particle size of a predetermined size or less are removed by a vibrating sieve (not shown). By the sieving, for example, those having a particle size of 3 mm to 10 mm are conveyed to the storage unit 30 of the desulfurization apparatus 3.

In the desulfurization system 1, for example, a transport mechanism such as a belt conveyor is provided between the extrusion molding machine 27 and the steam curing device 4 or between the dryer 28 and the storage unit 30. By this transport mechanism, the raw material of the desulfurizing agent or the desulfurizing agent is transported to the equipment or device in the subsequent stage. The belt conveyor, which is a transfer mechanism between the extrusion molding machine 27 and the steam curing device 4, will be exemplified later. The transport of the desulfurizing agent raw material and desulfurizing agent by each transport mechanism is performed in parallel with the processing of each device and device. As a result, while the desulfurization system 1 is in operation, the desulfurization agent is continuously produced in the desulfurization agent production facility 2 and the desulfurization agent is continuously supplied to the desulfurization apparatus 3. Therefore, desulfurization in the first desulfurization tower 31 and the second desulfurization tower 32 can be continuously performed.

Subsequently, the steam curing device 4 will be described in more detail. In this steam curing device 4, the granules 40, which are desulfurizing agents, are cured. As described above, the curing is performed by heating the granules 40 in a steam atmosphere. This curing increases the hardness of the granular material 40. The increase in hardness prevents the granules 40 from being crushed by impact during transportation to the desulfurization apparatus 3 and during formation of the moving layer in the desulfurization apparatus 3. Therefore, the crushed granules 40 are prevented from entering the gaps between the devices and devices constituting the desulfurization system 1. As a result, the occurrence of malfunction of the device or device is prevented. In addition, the curing proceeds a chemical reaction between each compound in the granular material 40. As a result, the activity as a desulfurizing agent is increased.

The steam curing device 4 is provided with a square-shaped processing container 41 that is elongated in the front-rear direction. The front-rear direction of the processing container 41 is the X direction. The left-right direction of the processing container 41 is the Y direction. The height direction of the processing container 41 is the Z direction. This Z direction is also a vertical direction. The X, Y, and Z directions are orthogonal to each other. FIG. 3 is a longitudinal side view of the steam curing device 4 along the XZ plane.

Belt conveyors are provided in two upper and lower stages in the processing container 41, and each belt conveyor extends in the X direction. The upper belt conveyor and the lower belt conveyor are the first belt conveyor 42 and the second belt conveyor 43, respectively. As will be described later, the granules 40 are supplied to the front end portion of the first belt conveyor 42 by dropping the granules 40 in the processing container 41. The first belt conveyor 42 conveys the granules 40 supplied to the front end portion thereof to the rear. Then, the granular material 40 falls from the rear end of the first belt conveyor 42 by gravity. The rear end of the second belt conveyor 43 is arranged so as to receive the falling particles 40. The second belt conveyor 43 conveys the granules 40 received at the rear end to the front. A discharge path 44 is opened at the bottom of the processing container 41. From the front end of the second belt conveyor 43, the cured granules 40 fall into the discharge path 44 by gravity. By dropping the discharge path 44 in this way, the granules 40 are discharged to the outside of the processing container 41.

A pipe 46 extending in the X direction is provided at the bottom of the processing container 41. A plurality of pipes 46 are provided at the bottom of the processing container 41 at intervals in the Y direction. A branch pipe 47 branched from the pipe 46 is formed in the pipe 46, and the branch pipe 47 is provided at a plurality of positions of the pipe 46 separated from each other in the X direction. Therefore, the pipe 46 and the branch pipe 47 are configured in a manifold shape. Further, although not shown in FIG. 3, a plurality of pipes extending in the Y direction are provided at the bottom of the processing container 41 at intervals in the X direction, and the branch pipes 47 are separated from each other in the Y direction. It may be formed at a position. As described above, by arranging the plurality of branch pipes 47 in the X direction and the Y direction in a dispersed manner, the steam can be uniformly dispersed in the processing container 41. In the present embodiment, hot water 40A is stored in the bottom of the processing container 41, and the steam ejected from the branch pipe 47 rises as bubbles in the hot water 40A and is supplied into the processing container 41. To. In FIG. 3, the case where the branch pipe 47 is open upward is illustrated, but the branch pipe 47 may be open laterally or downward. A steam generation mechanism 48 is provided outside the processing container 41, and the upstream side of the pipe 46 is connected to the steam generation mechanism 48. Water vapor is generated by the water vapor generation mechanism 48. This water vapor is supplied to the branch pipe 47 via the pipe 46, and is further discharged upward from the branch pipe 47. As a result, a water vapor atmosphere is formed in the processing container 41. The steam generation mechanism 48, the pipe 46, and the branch pipe 47 are configured as a steam supply unit.

Two horizontally long hoppers 51 are provided on the upper side of the front end portion of the processing container 41, and the two hoppers 51 are slightly separated from each other to the left and right. Further, each hopper 51 opens upward, and the opening of each hopper 51 is formed as a supply port when the granular material 40 is supplied to the processing container 41. Reference numeral 75 in FIG. 3 is a third belt conveyor, which is provided on the processing container 41. The granular material 40 falls from the third belt conveyor 75 to the hopper 51 and is supplied into the processing container 41.

The lower end of each hopper 51 is connected to a square cylinder 52 extending in the vertical direction. Therefore, the square tube 52 extends in the vertical direction. The lower end of the square cylinder 52 is connected to the upper part of the processing container 41. Then, in the square cylinder 52, a supply path 53 that serves as a passage when the granules 40 are supplied to the processing container 41 is formed, and the supply path 53 is open to the inside of the processing container 41. Therefore, the square cylinder 52 is a peripheral wall forming the supply path 53, and the supply path 53 projects upward from the processing container 41. The supply path 53 is not provided with a drive mechanism such as a valve, and the granular material 40 supplied to the hopper 51 falls down the supply path 53. Due to the drop, the granular material 40 is supplied to the front end portion of the first belt conveyor 42.

Subsequently, the description will be continued with reference to FIG. FIG. 4 is a cross-sectional plan view of the square cylinder 52 and the supply path 53 along the XY plane. Since the supply path 53 and the square tube 52 project vertically from the processing container 41 as described above, FIG. 4 is a view of the supply path 53 and the square tube 52 viewed in the projecting direction. When viewed in the protruding direction in this way, the square cylinder 52 and the supply path 53 form a rectangular shape. The front wall portion and the rear wall portion of the square cylinder 52 are shown as 52A and 52B, respectively, and the

wall portions

52A and 52B form the long sides of the rectangle. Further, the left and right wall portions of the square cylinder 52 forming the short side of the rectangle are shown as 52C. In this embodiment, the case where compressed air is used as the gas discharged to the supply path 53 will be described. In FIG. 4 and FIGS. 5 and 6 described later, the flow of compressed air discharged to the supply path 53 is indicated by a dotted arrow.

A slit 61 is formed in the wall portion 52B on the rear side, and the slit 61 extends along the long side of the rectangle. The slit 61 is a discharge port for compressed air, and the compressed air supplied from the outside of the square cylinder 52 is discharged to the supply path 53. The compressed air is projected obliquely and downward with respect to the vertical axis of the square cylinder 52. Therefore, the discharge direction of the compressed air in the slit 61 is a direction that intersects the supply path 53. Hereinafter, description will be made with reference to FIG. FIG. 5 is a cross-sectional view taken along the line AA of FIG. More specifically, FIG. 5 shows a cross section of the supply path 53 and the square tube 52 along the short side of the rectangle when viewed in the XY plane. In FIG. 5, θ1 is an angle formed by the opening direction (compressed air discharge direction) of the slit 61 and the horizontal plane (indicated by a chain line). This θ1 is, for example, 45 °, and the compressed air discharged from the slit 61 collides with the wall portion 52A on the front side.

A cover 62 is provided on the wall portion 52B of the square cylinder 52. The cover 62 covers the slit 61 from the outside of the square cylinder 52. A diffusion space 63 for supplying compressed air to the slit 61 is formed between the cover 62 and the wall portion 52B. The diffusion space 63 communicates with the slit 61 and is formed along the length direction of the slit 61. Four downstream ends of the air supply pipe 60 are connected to the cover 62. These downstream ends are spaced apart along the length direction of the diffusion space 63 and are open to the diffusion space 63. The upstream side of the air supply pipe 60 merges and is connected to the compressor 65 via the heater 64. Therefore, the compressed air supplied from the compressor 65 is heated by the heater 64 and then supplied to each part of the diffusion space 63. This compressed air spreads in the diffusion space 63 and is discharged from each part of the slit 61 with high uniformity. Since the compressed air is heated by the heater 64, it becomes hot air and is discharged from the slit 61.

Hereinafter, the description will be continued with reference to FIG. FIG. 6 is a cross-sectional view taken along the line BB of FIG. More specifically, FIG. 6 shows a cross section of the supply path 53 and the square tube 52 along the long side of the rectangle when viewed in the XY plane. Slits 66 are formed in each of the left and right wall portions 52C forming the square cylinder 52, and each slit 66 extends along the short side of the rectangle. Each slit 66 is a discharge port for compressed air, and the compressed air supplied from the outside of the square cylinder 52 is discharged to the supply path 53. The compressed air is projected obliquely and downward with respect to the vertical axis of the square cylinder 52. Therefore, the discharge direction of the compressed air in the slit 66 is also a direction that intersects the supply path 53. In FIG. 6, θ2 is an angle formed by the opening direction (compressed air discharge direction) of the slit 66 and the horizontal plane (indicated by a chain line). This θ2 is, for example, 45 °.

A cover 67 is provided on each wall portion 52C. The cover 67 covers the slit 66 from the outside of the square cylinder 52. A diffusion space 68 for supplying compressed air to the slit 66 is formed between the cover 67 and the wall portion 52C. The diffusion space 68 communicates with the slit 66 and is formed along the length direction of the slit 66. The downstream end of the air supply pipe 69 is connected to the cover 67. This downstream end opens into the diffusion space 68. The upstream side of the air supply pipe 69 is connected to, for example, an air supply pipe 60, a heater 64, or a header pipe 601 connecting the heater 64 and the air supply pipe 60. Therefore, when the heated compressed air is supplied to the slit 61 and the diffusion space 63, the heated compressed air is also supplied to the diffusion space 68. This compressed air spreads in the diffusion space 68 and is discharged from each part of the slit 66 with high uniformity. Since the compressed air is heated by the heater 64, it becomes hot air and is discharged from the slit 66. The

slits

61, 66, the

air supply pipes

60, 69, and the compressor 65 form a gas discharge portion.

By the way, in FIG. 5 described above, the flow of water vapor in the processing container 41 is indicated by a solid arrow. With reference to FIG. 5, the flow of compressed air discharged from the

slits

61 and 66 and the flow of water vapor will be described below. When the compressed air discharged from the slit 61 collides with the wall portion 52A, it is supplied from above with respect to the collision position, so that it flows downward from the collision position and flows into the processing container 41. That is, the compressed air does not go upward in the supply path 53. Further, since the compressed air discharged from each slit 66 is also discharged diagonally downward, it does not go upward but flows into the processing container 41. The compressed air discharged from the

slits

61 and 66 in this way is supplied into the processing container 41. In order to prevent the temperature inside the processing container 41 from dropping due to the inflow of compressed air, the compressed air is heated by the heater 64.

When compressed air is discharged from the

slits

61 and 66, an air layer that blocks the supply path 53 is formed. The water vapor in the processing container 41 rises in the processing container 41 and flows into the supply path 53 due to the action of heat contained in the water vapor. However, the water vapor is blocked by the above-mentioned air layer (it cannot pass through the air layer) and does not move to the upper side of the supply path 53. Then, the air forming the air layer flows downward in the supply path 53 as described above, but the water vapor whose movement is blocked is returned to the inside of the processing container 41 by riding on the air flow. Therefore, the leakage of water vapor to the outside of the processing container 41 is prevented, and the water vapor atmosphere inside the processing container 41 is sealed. On the other hand, the granular material 40 falling in the supply path 53 passes through the air layer due to gravity and is supplied to the first belt conveyor 42 as described above. In this way, the above air layer is configured as an air curtain, and while separating the internal atmosphere and the external atmosphere of the processing container 41, it is possible to move the solid particles 40 into the processing container 41. To do.

In order to clearly describe the effect of the steam curing device 4 that seals with compressed air as described above, the steam curing device of the comparative example will be described with reference to FIG. 7. In the steam curing device of this comparative example, the

slits

61 and 66 are not provided because the seal is not performed by compressed air. In the steam curing device of the comparative example, a rotary valve 71 is provided in the supply path 53. The rotary valve 71 includes a rotating shaft 72 extending in the horizontal direction and a plurality of blades 73. The blades 73 project radially from the rotating shaft 72 when viewed in the axial direction of the rotating shaft 72.

As described in FIG. 5, the water vapor in the processing container 41 rises and enters the supply path 53. Therefore, the water vapor adheres to the surface of the rotary valve 71. Therefore, dew condensation occurs on the surface of the rotary valve 71. Then, the granules 40 before being cured in a water vapor atmosphere have adhesiveness to the solid surface by absorbing moisture. More specifically, the hygroscopic granules 40 have adhesiveness to iron constituting the rotary valve 71 and metals such as steel and carbon steel called SS41 or SS400. Further, the moisture-absorbed granules 40 have adhesiveness (cohesiveness) between the granules 40.

Therefore, the granular material 40 supplied between the blades 73 of the rotary valve 71 that has condensed absorbs moisture and adheres to the surface of the rotary valve 71. The granules 40 supplied to the rotary valve 71 are further adhered to the granules 40 thus adhered. Therefore, the granules 40 aggregate and increase between the blades 73, and the supply path 53 is gradually blocked. The left side of FIG. 7 shows the state before such an obstruction occurred, and the right side of FIG. 7 shows the state before the obstruction occurred. The steam curing device 4 according to the present embodiment seals the atmosphere inside the processing container 41 without using the rotary valve 71. Thereby, such blockage of the supply path 53 is prevented.

The operation of the steam curing device 4 will be described below. The inside of the processing container 41 of the steam curing device 4 has the above-mentioned steam atmosphere, and the compressed air heated from the

slits

61 and 66 is discharged to each supply path 53 to form an air layer. To. On the other hand, the granules 40 are continuously supplied to the third belt conveyor 75, and the third belt conveyor 75 continuously conveys the granules 40 toward the hopper 51 and continuously into the processing container 41. Then, the granular material 40 is supplied.

As described with reference to FIG. 5, the granules 40 supplied to the hopper 51 fall down the supply path 53, pass through the above-mentioned air layer, and are supplied to the first belt conveyor 42, but in the processing container 41. Water vapor is blocked by the air layer and prevents leakage to the outside of the processing container 41. The granules 40 supplied into the processing container 41 are exposed to water vapor and heated to, for example, 90 ° C. to 100 ° C., for example, 95 ° C. for curing. The granules 40 are conveyed in the processing container 41 by the first belt conveyor 42 and the second belt conveyor 43 over, for example, 5 hours to 15 hours, for example, 10 hours. After that, the granular material 40 is supplied from the second belt conveyor 43 to the discharge path 44 and discharged to the outside of the processing container 41. The transfer of the granules 40 by the first belt conveyor 42 and the second belt conveyor 43 is also continuously performed. Therefore, the supply of the granules 40 to the processing container 41 and the discharge of the cured granules 40 from the processing container 41 are performed continuously.

According to the steam curing device 4 described above, compressed air is supplied from the

slits

61 and 66 to the supply path 53 that opens to the outside of the processing container 41 via the hopper 51 so as to intersect the supply path 53. As a result, while allowing the granules 40 to pass through the supply path 53, the water vapor atmosphere in the processing container 41 is sealed so as not to leak to the outside. By sealing with compressed air in this way, it is not necessary to have a drive mechanism for opening and closing the supply path 53 such as the rotary valve 71 while preventing the generation of excess water vapor and suppressing energy loss. By eliminating the need for a drive mechanism in this way, the device configuration of the steam curing device 4 is simplified, the supply port is prevented from being blocked by the desulfurizing agent, and the reliability in the operation of the desulfurizing agent manufacturing equipment 2 is improved. Can be made to.

Then, as described with reference to the comparative example, it is possible to prevent the supply path 53 from being blocked due to the adhesion of the granular material 40 to the drive mechanism such as the rotary valve 71. Therefore, the granules 40 can be continuously supplied to the processing container 41 by the third belt conveyor 75. More specifically, in the case of the configuration of the comparative example, the granules 40 cannot be sufficiently supplied into the processing container 41 in, for example, about one day due to the adhesion of the granules 40 to the rotary valve 71. Therefore, in the configuration of the comparative example, it was necessary to stop and clean the rotary valve 71 at least once a day. In this configuration, since it is not necessary to clean the rotary valve 71, the granules 40 can be continuously supplied into the processing container 41. Therefore, since the frequency of stopping the operation of the steam curing device 4 can be reduced, the productivity of the desulfurizing agent in the desulfurizing agent manufacturing equipment 2 is increased.

Cleaning of the rotary valve 71 in the comparative example will be supplementarily described. At the time of this cleaning, the apparatus is set so that the production amount of the desulfurizing agent is the minimum, and the third belt conveyor 75 is in a state where the granules 40 are supplied only to one hopper 51 of the steam curing apparatus 4. Meanwhile, the rotary valve 71 of the supply path 53 connected to the other hopper 51 is cleaned to remove the fixed particles 40. After the cleaning work is completed, the third belt conveyor 75 is in a state of supplying the granules 40 only to the other hopper 51. Then, the rotary valve 71 of the supply path 53 connected to one of the hoppers 51 is cleaned. As described above, each rotary valve 71 cannot be used in one day, so the cleaning frequency is, for example, once a day. As for the working time, for example, it takes one hour for two workers to clean the two rotary valves 71. Further, when cleaning the rotary valve 71, in order to ensure safety, work such as stopping the rotary valve 71 and releasing the power supply is also performed, so that it takes time and labor for operation other than the cleaning work.

When the air curtain is formed as in the steam curing device 4 according to the present embodiment, cleaning may be performed as appropriate. Specifically, for example, cleaning may be performed when the adhesion of the granular material 40 to the peripheral wall of the supply path 53 is confirmed during the inspection of patrol or the like. Since the structure of the supply path 53 is simple, the working time is 1 to 2 minutes for one worker. Therefore, it is not necessary to reduce the production amount of the desulfurizing agent during the cleaning operation. In addition, there is no need to open the power supply. By using the steam curing device 4 in this way, the labor and time required for maintenance can be greatly reduced, and the productivity of the desulfurizing agent is also increased.

Further, according to the steam curing device 4, since the granules 40 fall down the supply path 53 and are supplied into the processing container 41, it is not necessary to provide a transport mechanism in the supply path 53. Therefore, the manufacturing cost of the device can be reduced more reliably. Then, when the granules 40 are dropped and supplied into the processing container 41 in this way, the slit 61 provided in the wall portion 52B forming the supply path 53 is obliquely directed toward the wall portion 52A facing the wall portion 52B. Discharge compressed air downward. By discharging the compressed air in this way, the discharged air goes downward along the wall portion 52A and flows into the processing container 41. That is, since it is prevented that the air entrains water vapor and flows upward in the supply path 53, it is possible to more reliably prevent the water vapor from leaking to the outside of the processing container 41. That is, a higher sealing effect can be obtained.

Further, with respect to the slit 61, since compressed air is discharged in the short side direction of the rectangle formed by the supply path 53 when the supply path 53 is viewed in the forming direction (protruding direction), the wall portion 52A and the wall portion 52B are formed. When the flow velocity of air becomes sufficiently high in each part between them, the supply path 53 can be reliably blocked. Therefore, it is possible to more reliably prevent water vapor from leaking to the outside of the processing container 41. Then, in addition to the discharge of the compressed air from the slit 61, the compressed air is discharged from the slit 66 in the long side direction of the rectangle and in the two directions facing each other, so that the processing container 41 can be more reliably discharged. It is possible to prevent the leakage of water vapor to the outside. Since the discharge direction of the compressed air in the slit 66 is also diagonally downward, it is possible to more reliably prevent the leakage of water vapor.

Of the

wall portions

52A and 52B constituting the square cylinder 52, compressed air may be discharged from the wall portion 52A. Further, in the above-described example, compressed air is discharged from a slit in the peripheral wall forming the supply path 53, but the configuration is not limited to this. For example, a nozzle may be provided on the peripheral wall, and compressed air may be discharged from the nozzle. Further, with respect to the wall portion 52B, compressed air may be discharged from one place, or compressed air may be discharged from a plurality of places. That is, for example, the slit 61 may be divided in the long side direction of the rectangle to open, or a plurality of nozzles may be arranged along the long side direction. Further, the compressed air may be discharged from the

wall portions

52A and 52C from a plurality of locations in the same manner as the compressed air is discharged from the wall portions 52B.

By the way, when sealing the supply path 53, it may be performed by a gas other than air, or may be performed by an inert gas such as nitrogen gas. Further, the supply path 53 of the granular material 40 is not limited to being rectangular when viewed in the forming direction of the supply path 53, and may be circular (including a perfect circle and an ellipse). However, in order to ensure sealing, the gas discharge direction should be shorter than the direction orthogonal to the discharge direction when the supply path 53 is viewed in the formation direction as described above. Is preferable. That is, when the supply path 53 is rectangular as described above, it is preferable to discharge the gas at least in the short side direction of the rectangle.

Further, the supply path 53 is not limited to being formed vertically downward, and may be inclined. That is, the granules 40 may slide down the wall surface forming the supply path 53 to be supplied into the processing container 41. Then, depending on the inclination of the supply path 53, the water vapor can be discharged from the supply path 53 into the processing container 41 together with the air by discharging the air so as to face vertically downward. That is, the compressed air is not limited to being supplied diagonally downward.

The desulfurization system 1 described above may be provided, for example, in a coal-fired power plant or for desulfurization of exhaust gas from a coke oven. Further, although an example in which the desulfurizing agent manufacturing facility 2 and the desulfurizing device 3 are integrated as a desulfurization system 1 is shown, the configuration is not limited to such a structure, and the desulfurizing agent manufacturing facility 2 is independent. It may be an installed configuration.

_{Silica (SiO 2} ), alumina (AlO ₂ ), etc. are eluted from coal ash, which is one of the raw materials for desulfurizing agents, and slaked lime (Ca (OH) ₂ ) and gypsum (CaSO ₄ ), which are calcium compounds. By forming a hydrated compound between them, a highly active desulfurizing agent can be obtained. In the above-mentioned example, an example in which coal ash is used as an active source supply material for supplying silica and alumina has been shown, but the active source supply material is not limited to coal ash, for example, volcanic ash, slag, diatomaceous earth, and so on. It may be bentonite, diatomaceous earth, blast furnace slag, or the like. Further, quicklime (CaO) may be used as the calcium compound instead of slaked lime.

Subsequently, the configuration of the square cylinder 52 and the supply path 53 of the steam curing device 4 will be described in more detail with reference to FIG. A width adjusting member 54 for adjusting the width of the supply path 53 can be detachably provided on the square cylinder 52 and the hopper 51. The width adjusting member 54 is vertically long and is formed in a plate shape in which two points in the vertical direction are bent. The width adjusting member 54 includes an inclined portion 55, a vertical portion 56, and a horizontal portion 57, and the inclined portion 55, the vertical portion 56, and the horizontal portion 57 are formed to be continuous with each other.

Assuming that the inclined surface on the front side of the hopper 51 is formed and the inclined surface descending from the front side to the rear side of the hopper 51 is 51A, the inclined portion 55 overlaps the inclined surface 51A. The lower end of the inclined portion 55 is located closer to the rear side (wall portion 52B side) than the lower end of the inclined surface 51A. The vertical portion 56 is provided apart from the wall portion 52A of the square cylinder 52 on the rear side. The vertical portion 56 faces the wall portion 52A and covers the inner peripheral surface of the wall portion 52A. The horizontal portion 57 extends from the lower end of the vertical portion 56 toward the front side and is connected to the lower side of the wall portion 52A. Then, the compressed air discharged from the slit 61 is discharged toward the vertical portion 56. As such, the width adjusting member 54 reduces the width of the slit 61 in the supply path 53 in the air discharge direction. Therefore, it is possible to suppress a decrease in the air flow velocity in each part of the supply path 53 and perform more reliable sealing.

Further, the wall portion 52B of the square cylinder 52 is composed of a main body portion 58 and a separation portion 59. The separation portion 59 is configured so that the height position of the separation portion 59 can be freely changed with respect to the main body portion 58, the hopper 51, and the cover 62. The lower end of the separation portion 59 forms a hole wall on the upper side of the slit 61 which is a discharge port. Therefore, by adjusting the height of the separation portion 59, the upper and lower opening widths of the slit 61, that is, the opening width in the formation direction (vertical direction) of the supply path 53 is adjusted. By adjusting the opening width, the flow velocity of the discharged air can be easily adjusted, and an appropriate sealing property can be obtained.

FIG. 9 is a longitudinal side view of the steam curing device 8 which is an example of another steam curing device. In FIG. 9, the same components as those of the steam curing device 4 are designated by the same reference numerals, and the description thereof will be omitted. Explaining mainly the differences from the steam curing device 4, the steam curing device 8 includes a processing container 81 and a belt conveyor 82. A pipe 46 and a branch pipe 47 are provided in the processing container 81 in the same manner as in the processing container 41, and the water vapor discharged from the branch pipe 47 creates a water vapor atmosphere in the processing container 81. One end side and the other end side of the belt conveyor 82 extend from the inside of the processing container 81 to the outside of the processing container 81 via the carry-in inlet 83 and the carry-out port 84 provided on the side wall of the processing container 81, respectively. The solid matter 85 is conveyed in the lateral direction by the belt conveyor 82 provided in this way. The carry-in port 83 constitutes a supply path for the solid matter 85.

In the peripheral wall forming the carry-in inlet 83 and the carry-out outlet 84, the discharge port 86 opens on the upper side and the discharge port 87 opens on the lower side. Compressed air is discharged upward and downward from the discharge port 86 and the discharge port 87, respectively. In this way, the compressed air discharged from the

discharge ports

86 and 87 forms an air layer so as to block the carry-in inlet 83 and the carry-out port 84, and the water vapor atmosphere in the treatment container 81 is sealed as in the treatment container 41. To. However, the solid material 85 conveyed by the belt conveyor 82 can pass through the carry-in inlet 83 and the carry-out outlet 84. Then, the solid matter 85 is cured by being exposed to water vapor while moving in the processing container 81.

As described above, the steam curing apparatus of the present invention may be carried in and out of the processing container by moving the solid material in the lateral direction, and the solid material may be dropped into the processing container and supplied. Not limited to that. Further, the solid matter 85 described above is a secondary concrete product such as a U-shaped groove, and is cured by being exposed to water vapor in the processing container 81. Therefore, the solid matter to be steam-cured is not limited to being a granular material, and is not limited to being a raw material for a desulfurizing agent.

Further, the processing container may be configured to have a rectangular parallelepiped shape and a vertical cross-sectional view concave shape by opening the upper side. Then, the processing container may be sealed by discharging air from one of the two vertical wall portions facing each other toward the other. However, it is preferable to have the above-described configuration in which a gas such as compressed air is discharged and sealed in a supply path protruding from the space inside the processing container as in the steam curing device 4. That is, it is preferable to configure the container so that the opening is narrowed. This is because the area required for the seal can be reduced by the configuration, and the leakage of water vapor can be prevented more reliably. By the way, the steam used in the steam curing apparatus of the present invention may be composed of a substance other than water. For example, steam which is water mixed with alcohol may be used.

It should be noted that the embodiments disclosed this time are exemplary in all respects and are not considered to be restrictive. The above-described embodiments may be omitted, replaced, modified in various forms, or combined with each other without departing from the scope and purpose of the appended claims.

4 Steam curing device 48 Steam generation mechanism 53

Supply path

61, 66 Slit

Claims

A processing container for steam curing solids and
A steam supply unit that supplies steam for curing the solid matter into the processing container,
A supply path that opens to the inside of the processing container and the outside of the processing container to supply the solid matter into the processing container, and
A gas discharge unit that discharges gas in a direction intersecting the supply path to allow the solid matter to pass through the supply path and seals the vapor atmosphere in the processing container.
A steam curing device equipped with.
The steam curing device according to claim 1, wherein the solid matter has adhesiveness to the solid surface by absorbing moisture.
The solid matter is a granule which is a raw material of a desulfurizing agent containing a calcium compound and coal ash.
The steam curing device according to claim 2, wherein the steam is steam.
The steam curing apparatus according to claim 1, wherein the supply path is formed so as to project from the processing container toward the outside of the processing container.
The steam curing device according to claim 4, wherein the supply path is formed so as to extend in the vertical direction, and the solid matter is dropped into the processing container and supplied.
The steam curing device according to claim 5, wherein the gas discharge unit discharges the gas diagonally downward from a part of the peripheral wall forming the supply path toward the other part.
Looking at the supply path in the protruding direction,
The steam curing apparatus according to claim 4, wherein the discharge direction of the gas in the supply path is shorter than the direction orthogonal to the discharge direction.
The supply path is opened in a rectangular shape having a long side and a short side.
The steam curing device according to claim 1, wherein the discharge unit discharges the gas in the short side direction with respect to the supply path.
The steam curing device according to claim 8, wherein the gas discharge unit discharges the gas in two long side directions facing each other.
The steam curing apparatus according to claim 1, wherein the peripheral wall forming the supply path is detachably attached and detached, and a width adjusting member for adjusting the width of the supply path in the gas discharge direction is provided.
The gas discharge unit includes a discharge port opened in a peripheral wall forming a supply path.
The steam curing apparatus according to claim 1, wherein the width of the discharge port in the forming direction in which the supply path extends is adjustable.
A granulation part that granulates granules that are raw materials for desulfurization agents, including calcium compounds and coal ash,
The steam curing apparatus according to claim 1, wherein the granules are supplied as the solid matter, steam is supplied into the processing container as the steam, and the desulfurizing agent is cured.
Desulfurizing agent manufacturing equipment provided with.
The desulfurization agent manufacturing apparatus according to claim 12, wherein a transport mechanism is provided for continuously transporting the granulated particles in the granulated portion to the supply path of the steam curing device.