Rotary cylindrical hydrogen gas reduction device

Abstract

To provide a rotary cylindrical hydrogen gas reduction apparatus 10 that allows the raw materials filled in the rotating cylindrical body and the introduced hydrogen gas to come into good contact when stirred, thereby enabling the reaction to proceed rapidly. [Solution] As the rotating cylindrical body 12 rotates, a Pilz valve 30 is provided, in which the Pilz valve heads 36 and 37 move up and down by their own weight to open and close. This Pilz valve 30 blows light hydrogen gas H from below into the reaction space 12a, and exhausts water vapor W from the reaction space 12a to the outside of the rotating cylindrical body 12 through the internal space of the inner cylinder 22. In the reaction space 12a, the hydrogen gas H and the raw material M are efficiently stirred, increasing the opportunity for contact between the two and promoting the reduction reaction.

Description

Technical Field

[0001] The present invention relates to a rotary cylindrical hydrogen gas reduction device, and more particularly to a rotary cylindrical hydrogen gas reduction device provided with a horizontally installed rotary cylindrical body, into which a raw material to be processed and hydrogen gas are introduced and a reduction reaction is caused between the two.

Background Art

[0002] Titanium, whose applications have been expanding in recent years in aircraft jet engines, turbine blades, chemical apparatuses that require corrosion resistance, medical instruments that do not cause rejection reactions in the body, etc., is obtained by reducing an ore called ilmenite. However, since its binding force with oxygen is strong, refining by direct reduction of the ore is impossible. Therefore, first, the raw ore (ilmenite) is mixed with coke or the like and heated to perform primary reduction. Next, chlorine gas is passed through to obtain titanium tetrachloride, magnesium is added to this titanium tetrachloride, and magnesium chloride and crude titanium are obtained from the titanium tetrachloride. However, the crude titanium has a low degree of purification and cannot be used as metallic titanium. Therefore, this crude titanium is subjected to a re-reduction treatment.

[0003] For the re-reduction treatment of crude titanium, a hydrogen gas reduction device as disclosed in JP-A-2023-39794 is used. This device is a type of rotary kiln and has a horizontally placed rotary cylindrical body. The rotary cylindrical body is provided with a hydrogen gas supply port and a raw material supply port on one end side, and a discharge port for the processed raw material on the other end side.

[0004] In this device, the rotary cylindrical body is filled with crude titanium and hydrogen gas, and the reduction treatment is performed by rotating the rotary cylindrical body and stirring the two. The processed raw material is installed so as to incline downward from the supply port to the discharge port of the rotary cylindrical body, and is moved from the supply port side to the discharge port side along the axial direction of the rotary cylindrical body by its own weight, and is recovered from the discharge port.

Prior Art Documents

Patent Documents

[0005] [Patent Document 1] Japanese Patent Publication No. 2023-39794 [Overview of the project] [Problems that the invention aims to solve]

[0006] Incidentally, in this type of hydrogen gas reduction device, the amount of raw material that can move along the axial direction from the supply port side to the discharge port side without clogging in a rotating cylindrical body depends on the inclination angle of the rotating cylindrical body, but is generally limited to about 30% of the cross-sectional area of ​​the cylinder. The filled raw material moves along the bottom of the rotating cylindrical body, and a space of 70% of the cross-sectional area is formed at the top of the rotating cylindrical body where there is no raw material.

[0007] When crude titanium is supplied to a rotating cylinder and filled with hydrogen gas, the crude titanium and hydrogen gas react inside the rotating cylinder to generate water vapor. The gas density of hydrogen gas is 0.08 kg / m³. 3 In contrast, the gas density of water vapor is 1.5-2 kg / m³. 3 Furthermore, water vapor has a gas density more than 20 times greater than that of hydrogen gas. Therefore, as schematically shown in Figure 7, a layer of lighter hydrogen gas b forms in the upper part of the internal space of the rotating cylinder a, and a layer of heavier water vapor c forms in the lower part. As a result, the hydrogen gas b at the top and the crude titanium raw material d at the bottom are separated by the layer of water vapor c, causing poor contact between the titanium raw material d and the hydrogen gas b, which hinders the progress of the reduction reaction.

[0008] In view of the above problems, the present invention aims to provide a rotary cylindrical hydrogen gas reduction apparatus in which, when the rotary cylinder is rotated and the raw material filled in the rotary cylinder and hydrogen gas are stirred, the two are in good contact, thereby enabling the reduction reaction to proceed rapidly. [Means for solving the problem]

[0009] The invention described in claim 1 is a rotary cylindrical hydrogen gas reduction apparatus in which a raw material and hydrogen gas are filled into a horizontally positioned rotary cylindrical body, and the rotary cylindrical body is rotated to stir the raw material and hydrogen gas inside the rotary cylindrical body and cause a reduction reaction between the two, The rotating cylindrical body consists of an outer cylinder and an inner cylinder that rotate concentrically as a single unit. The inner surface of the outer cylinder and the outer surface of the inner cylinder have a donut-shaped cross-section, forming a reaction space that extends along the axial direction of the rotating cylindrical body. One end of the rotating cylinder is provided with a raw material inlet for introducing raw materials into the reaction space and a hydrogen gas supply inlet for introducing hydrogen gas into the internal space of the inner cylinder. The other end of the rotating cylinder is provided with a steam outlet for discharging water vapor produced by the reduction reaction between the raw materials and hydrogen gas to the outside of the rotating cylinder and a raw material outlet for discharging the reduced raw materials to the outside of the rotating cylinder. A lifter is provided that protrudes into the reaction space from the inner surface of the outer cylinder or the outer surface of the inner cylinder. A partition is installed in the inner cylinder to prevent hydrogen gas and water vapor generated by the reduction reaction from coming into contact, dividing the internal space of the inner cylinder into two parts: the hydrogen gas supply port side and the water vapor outlet port side. Multiple Pilz valves are provided at various locations on the inner cylinder, each consisting of a valve spout that penetrates the inner cylinder diametrically, with both end faces opening into the reaction space, valve seats provided on these open end faces, and a valve spout hole formed in the middle that opens into the internal space of the inner cylinder, and a Pilz valve stud that is attached to the valve spout and has Pilz valve heads fixed to both ends, allowing it to move freely up and down by its own weight as the rotating cylindrical body rotates. Connect a blower to the steam outlet to draw in steam. As the rotating body rotates, one Pilz valve head comes to the uppermost position and presses against the valve seat, completely closing the upper opening end face of the valve spout. At the same time, the other Pilz valve head is in the lowermost position and separated from the valve seat, causing the lower opening end face of the valve spout to open completely. Hydrogen gas is supplied from the internal space of the inner cylinder on the hydrogen gas supply port side to the reaction space through the open lower opening end face, while water vapor generated in the reduction reaction is drawn out from the reaction space on the water vapor outlet side into the internal space of the inner cylinder and discharged from the internal space to the outside of the rotating cylindrical body. Preferably, the valve spouts are arranged at a constant pitch in the axial direction of the rotating cylindrical body, and adjacent valve spouts are arranged with a predetermined angular phase difference. Furthermore, a copper alloy is preferably used for the material of the Pilz valve head. [Effects of the Invention]

[0010] In the rotating cylindrical hydrogen gas reduction apparatus according to the present invention, raw materials are introduced into the reaction space from the raw material inlet, and hydrogen gas is introduced into the internal space of the inner cylinder from the hydrogen gas supply port. As the rotating cylinder rotates, the raw materials are lifted up from the bottom to the top of the reaction space by a lifter and fall, repeatedly accumulating within the reaction space, and the hydrogen gas passes through the accumulation as the reduction reaction proceeds. According to the present invention, hydrogen gas introduced into the internal space of the inner cylinder enters the valve spout through the valve spout hole. Then, when the Pilz valve head is in its lowest position and the lower opening end face of the valve spout opens, the hydrogen gas enters the reaction space through the opening end face. Meanwhile, a reduction reaction occurs between the raw materials and hydrogen gas within the reaction space, generating water vapor. Since water vapor is heavier than hydrogen gas, it settles at the bottom of the reaction space. When the Pilz valve head is in its lowest position and the opening end face is open, the water vapor is drawn from the reaction space through the open end face and through the valve spout, into the internal space of the inner cylinder through the valve spout hole, and then discharged to the outside of the rotating cylindrical body by the exhaust blower. Thus, in the rotary cylindrical hydrogen gas reduction apparatus according to the present invention, a Pilz valve is provided in which the Pilz valve head moves up and down by its own weight to open and close as the rotary cylinder rotates. This Pilz valve supplies light hydrogen gas H into the reaction space from below, and exhausts water vapor from the reaction space to the outside of the rotary cylinder through the internal space of the inner cylinder. As a result, the hydrogen gas H and the raw material M are efficiently stirred in the reaction space, increasing the opportunity for contact between the two and promoting the reduction reaction.

[0011] Furthermore, by arranging the valve spouts at a constant pitch in the axial direction of the rotating cylindrical body, and by arranging adjacent valve spouts with a predetermined phase difference, the hydrogen gas H and the raw material M are more efficiently stirred in the reaction space. Furthermore, by using a copper alloy for the Pilz valve head, it is possible to prevent the generation of metallic impact sparks that could ignite hydrogen gas when the Pilz valve head is pressed against the valve seat at its uppermost position, thereby improving safety. [Brief explanation of the drawing]

[0012] [Figure 1]It is a longitudinal sectional view showing a rotary cylindrical hydrogen gas reduction apparatus according to an embodiment of the present invention. [Figure 2] It is a sectional view showing a rotary cylindrical body of the rotary cylindrical hydrogen gas reduction apparatus. [Figure 3] It is an exploded perspective view showing a Pilz valve provided in the rotary cylindrical body. [Figure 4] It is a partial perspective view showing the rotary cylindrical body. [Figure 5] It is an operation explanatory view of a Pilz valve provided in the rotary cylindrical body. [Figure 6] It is an operation explanatory view of the rotary cylindrical body. [Figure 7] It is an operation explanatory view of a rotary cylindrical body of a conventional rotary cylindrical hydrogen gas reduction apparatus.

Embodiment

[0013] Hereinafter, an embodiment of the present invention will be described based on the reference drawings. In FIG. 1, a rotary cylindrical hydrogen gas reduction apparatus 10 according to an embodiment of the present invention is shown. The rotary cylindrical reactor 10 includes a rotary cylindrical body 12 horizontally installed on a common bed 11. One end of the common bed 11 is assembled to a base 14 so as to be rotatable in the vertical direction with a shaft 13 as a fulcrum, and the other end is supported by a tilting cylinder 15 fixed to the base 14 so as to be vertically movable. The rotary cylindrical body 12 can be tilted by the tilting cylinder 15.

[0014] Tires 16 are fitted to the outer peripheral portions of both the left and right ends of the rotary cylindrical body 12, and each tire 16 is placed on a tire receiving roller 18 rotatably attached to the common bed 11. Since one of the tire receiving rollers 18 is kinematically connected to a drive motor (not shown), the rotary cylindrical body 12 can be rotated by rotating the tire receiving roller 18 with the drive motor.

[0015] The rotary cylindrical body 12 has a double cylinder structure composed of an outer cylinder 21 and an inner cylinder 22 that rotate concentrically and integrally. As shown in FIGS. 2 and 3, the cross-sectional shape is donut-shaped between the inner peripheral surface of the outer cylinder 21 and the outer peripheral surface of the inner cylinder 22, and a reaction space 12a extending along the axial direction of the rotary cylindrical body 12 is partitioned and formed. [[ID=3**********]]

[0016] As shown in Fig. 1, a hydrogen gas supply port 22b for introducing hydrogen gas H into the internal space 22a of the inner cylinder 22 is provided at the right end of the rotating cylindrical body 12, and it is connected to a hydrogen gas introduction pipe 24 via a rotary joint 23. Further, a raw material inlet 12b for charging the raw material M into the reaction space 12a is provided at the right end of the rotating cylindrical body 12, and upper and lower double dampers 26 and 27 are provided at the raw material inlet 12b. These double dampers 26 and 27 function as valves. When one of the dampers 26 and 27 is open, the other damper 26 and 27 is closed. The raw material M is temporarily stored between the double dampers 26 and 27, and the air flow is intermittently blocked, so that the raw material M flows into the reaction space 12a.

[0017] A steam discharge port 22c for discharging steam W generated by the reduction reaction of the raw material M and hydrogen gas H to the outside of the rotating cylindrical body 12 and a raw material discharge port 12c for discharging the reduced raw material M to the outside of the rotating cylindrical body 12 are provided on the left end side of the rotating cylindrical body 12, and upper and lower double dampers 28 and 29 are provided at the raw material discharge port 12c. And the steam discharge port 22c is connected to an exhaust blower 31 via a rotary joint 23.

[0018] An electric furnace 32 is provided on the outer periphery of the middle part of the rotating cylindrical body 12. The electric furnace 32 heats the raw material M inside the rotating cylindrical body 12 to the reduction reaction start temperature at the initial stage of operation. And when the reaction starts to continue, the supply of the heat source is only carried out to supplement the heat generation required for the continuation of the reaction. Further, in order to prevent the hydrogen gas H introduced into the inner cylinder 22 and the steam W generated by the reduction reaction from mixing in the internal space 22a of the inner cylinder 22, a partition wall 22d that divides the internal space 22a of the inner cylinder 22 into two parts, namely the hydrogen gas supply port 22b side and the steam discharge port side 22c, is provided.

[0019] As shown in detail in Fig. 2, a lifter plate 21a bent in a zigzag shape is fixedly provided on the inner peripheral surface of the outer cylinder 21 and protrudes into the reaction space 12a. Similarly, a lifter plate 22e is also fixedly provided on the outer peripheral surface of the inner cylinder 22 and protrudes into the reaction space 12a.

[0020] As shown in Figures 1 and 4, multiple Pilz valves 30 are provided in the inner cylinder 22. Each Pilz valve 30 penetrates the inner cylinder 22 in the diametrical direction and has valve spouts 35 at both ends that open into the reaction space 12a. As shown in detail in Figures 2 and 3, a valve spout hole 35a is formed in the middle of each valve spout 35, opening into the internal space 22a of the inner cylinder 22. Valve seats 35c are provided on the open end faces 35b at both ends of the valve spout 35.

[0021] A Pilz valve stud 38 is attached to the valve spout 35, with copper alloy Pilz valve heads 36 and 37 fixed to both ends. This Pilz valve stud 38 is supported on the valve spout 35 by a stud guide 39 so that it can move freely under its own weight as the rotating cylindrical body 12 rotates. As shown in Figures 5(A), (B), and (C), when the Pilz valve head 36 reaches its uppermost position as the rotating cylindrical body 12 rotates, it presses against the valve seat 35c, completely closing the upper opening end face 35b of the valve spout 35. At this time, the Pilz valve head 37 is in its lowermost position, separated from the valve seat 35c, and the lower opening end face 35b of the valve spout 35 is fully open.

[0022] As shown in Figures 1 and 4, multiple valve spouts 35 are arranged at a constant pitch P in the axial direction of the rotating cylindrical body 12. In addition, adjacent valve spouts 35 are arranged with a phase difference of 90 degrees.

[0023] The structure of the rotary cylindrical hydrogen gas reduction device 10 according to this embodiment is as described above, and its operation will be explained below. Raw material M is introduced into the reaction space 12a of the rotating cylindrical body 12 from the raw material inlet 12b, hydrogen gas H is filled into the internal space 22a of the inner cylinder 22 from the hydrogen gas supply port 22b of the inner cylinder 22, the rotating cylindrical body 12 is heated and rotated in the heating furnace 32, and the exhaust blower 31 is activated.

[0024] As shown in Figure 6, as the rotating cylinder 12 rotates, the raw material M is scooped up from the bottom to the top of the reaction space 12a by the lifter plates 21a and 22e and falls, repeatedly accumulating within the reaction space 12a, and hydrogen gas H passes through the accumulation, expanding the reaction area. Since the reaction space 12 is narrowed in a donut shape, the concentration of hydrogen gas H increases overall, and water vapor W is generated when the hydrogen gas H comes into contact with the raw material M. Then, as shown by arrow A in Figure 1, hydrogen gas H flows from the internal space 22a of the inner cylinder 22 through the lower open end face 36b of the valve spout 35 into the reaction space 12a, and as shown by arrow B, water vapor W is discharged from the reaction space 12a through the lower open end face 36b of the valve spout 35 to the outside of the rotating cylinder 12 by the exhaust blower 31. Then, the raw material M that has been reduced inside the rotating cylinder is discharged to the outside of the rotating cylinder 12 from the raw material discharge port 12c by tilting the rotating cylinder 12 so that it descends from the raw material inlet port 12b towards the raw material discharge port 12c.

[0025] In the rotary cylindrical hydrogen gas reduction apparatus 10 according to this embodiment, a Pilz valve 30 is provided, in which the Pilz valve heads 36 and 37 move up and down by their own weight as the rotary cylindrical body 12 rotates, opening and closing. The Pilz valve 30 blows light hydrogen gas H from below into the reaction space 12a, and exhausts water vapor W from the reaction space 12a to the outside of the rotary cylindrical body 12 through the internal space of the inner cylinder 22. As a result, the hydrogen gas H and raw material M are efficiently stirred in the reaction space 12a, increasing the opportunity for contact between the two and promoting the reduction reaction.

[0026] Furthermore, because a copper alloy is used as the material, when the Pilz valve heads 36 and 37 come into contact with the valve seat 35c at the uppermost position as the rotating cylindrical body 12 rotates, it is possible to prevent the generation of metallic impact sparks that would ignite the hydrogen gas H, thereby improving safety. [Explanation of symbols]

[0027] 10…Rotating cylindrical hydrogen gas reduction device 11... Common bed 12…Rotating cylinder 12a…Reaction space 12b...Raw material input port 12c…Raw material discharge port 13...axis 14…Base 15…Tilting cylinder 16... Tires 18... Tire support roller 21…Outer cylinder 21a... Lifter plate 22…Inner cylinder 22a…Internal space 22b…Hydrogen gas supply port 22c... Steam outlet 22d…Bulkhead 22e... Lifter plate 23… Rotary joint 24…Hydrogen gas inlet pipe 26, 27, 28, 29... damper 30... Pilz valve 35… Valve spout 35a... Valve spout hole 35b, 36b...opening end surface 35c...Valve seat 36, 37... Pilz valve head 38... Pilz valve stud H...Hydrogen gas M…Raw material W...water vapor

Claims

1. The invention described in claim 1 is a rotary cylindrical hydrogen gas reduction apparatus in which a raw material and hydrogen gas are filled into a horizontally installed rotary cylindrical body, and the rotary cylindrical body is rotated to stir the raw material and hydrogen gas inside the rotary cylindrical body and cause a reduction reaction between the two, The rotating cylindrical body consists of an outer cylinder and an inner cylinder that rotate concentrically as a single unit. The inner surface of the outer cylinder and the outer surface of the inner cylinder have a donut-shaped cross-section, forming a reaction space that extends along the axial direction of the rotating cylindrical body. One end of the rotating cylinder is provided with a raw material inlet for introducing raw materials into the reaction space and a hydrogen gas supply inlet for introducing hydrogen gas into the internal space of the inner cylinder. The other end of the rotating cylinder is provided with a steam outlet for discharging water vapor produced by the reduction reaction between the raw materials and hydrogen gas to the outside of the rotating cylinder and a raw material outlet for discharging the reduced raw materials to the outside of the rotating cylinder. A lifter is provided that protrudes into the reaction space from the inner surface of the outer cylinder or the outer surface of the inner cylinder. A partition is installed in the inner cylinder to prevent hydrogen gas and water vapor generated by the reduction reaction from coming into contact, dividing the internal space of the inner cylinder into two sections: the hydrogen gas supply port side and the water vapor outlet port side. Multiple Pilz valves are provided at various locations on the inner cylinder, each consisting of a valve spout that penetrates the inner cylinder diametrically, with both end faces opening into the reaction space, valve seats provided on these open end faces, and a valve spout hole formed in the middle that opens into the internal space of the inner cylinder, and a Pilz valve stud that is attached to the valve spout and has Pilz valve heads fixed to both ends, allowing it to move freely up and down by its own weight as the rotating cylindrical body rotates. Connect a blower to the steam outlet to draw in steam. A rotary cylindrical hydrogen gas reduction device characterized in that, as the rotating body rotates, one Pilz valve head presses against the valve seat when it reaches the uppermost position, completely closing the upper opening end face of the valve spout, while the other Pilz valve head is at the lowermost position and separated from the valve seat, causing the lower opening end face of the valve spout to fully open, allowing hydrogen gas to pass through the open lower opening end face and be supplied from the internal space of the inner cylinder on the hydrogen gas supply port side to the reaction space, while water vapor generated in the reduction reaction is drawn out from the reaction space on the water vapor outlet side to the internal space of the inner cylinder and discharged from the internal space to the outside of the rotating cylindrical body.

2. The rotary cylindrical hydrogen gas reduction apparatus according to claim 1, characterized in that the valve spouts are arranged at a constant pitch in the axial direction of the rotating cylindrical body, and adjacent valve spouts are arranged with a predetermined angular phase difference.

3. The rotary cylindrical hydrogen gas reduction apparatus according to claim 1, characterized in that a copper alloy is used for the material of the Pilz valve head.

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