A heat-insulated and corrosion-resistant manhole device for maintenance of a fluidized bed chlorination furnace and the fluidized bed chlorination furnace.

Abstract

This invention provides a heat-insulating and corrosion-resistant manhole device for maintenance of a fluidized bed chlorination furnace and a fluidized bed chlorination furnace. The manhole device is installed in the boiling section of the fluidized bed chlorination furnace and includes a manhole connector, a stainless steel pipe, and a manhole cover. The manhole connector is connected to the furnace shell of the fluidized bed chlorination furnace, and the manhole cover is installed at the end of the manhole connector away from the furnace shell. The stainless steel pipe is installed inside the manhole connector, with the inner wall of the manhole connector nested with the outer wall of the stainless steel pipe. The stainless steel pipe extends towards the furnace chamber of the fluidized bed chlorination furnace and penetrates the refractory layer inside the furnace shell until it communicates with the furnace chamber. At least one sealing element is installed in the cavity of the stainless steel pipe, and the sealing element can be removed from or installed inside the stainless steel pipe. This invention, by installing a manhole device in the boiling section of the fluidized bed chlorination furnace, allows for the rapid discharge of slag from the furnace, saving time and effort, ensuring safety and efficiency, and greatly protecting the personal safety of employees.

Description

Technical Field

[0001] This invention relates to the field of chemical and metallurgical technology, and in particular to a heat-insulated and corrosion-resistant manhole device for the maintenance of a fluidized bed chlorination furnace and the fluidized bed chlorination furnace itself. Background Technology

[0002] When producing titanium tetrachloride in a fluidized bed chlorination furnace, chlorine is used as a raw material and the reaction temperature is 900-1000℃. In addition to titanium tetrachloride, small amounts of hydrogen chloride and other gases are also produced. Therefore, a large amount of titanium tetrachloride, chlorine, and small amounts of toxic gases such as hydrogen chloride will be present in the furnace chamber of the fluidized bed chlorination furnace.

[0003] Furthermore, considering the material state in the boiling section of the fluidized bed chlorination furnace, as well as factors such as toxic gas leakage and production safety, existing fluidized bed chlorination furnaces often do not have manholes in the furnace shell (especially in the boiling section). When the chlorination furnace malfunctions and needs to be shut down for maintenance, the usual maintenance procedure in the existing technology is to allow the material inside the furnace to cool naturally to room temperature, which generally takes about a week. Then, the top flange of the chlorination furnace is opened, and the gas inside the furnace is replaced by a blower. Only when the oxygen content inside the furnace reaches the safe oxygen range for personnel can they enter from the top of the furnace. At the same time, for the personnel operating inside the furnace, the slag is loaded into ton bags and hoisted out by the hoist on the top of the furnace, which is time-consuming and labor-intensive. Moreover, they are working in a confined space with limited (or even no) escape space, which is also a major threat to the safety of the personnel inside the furnace. Summary of the Invention

[0004] In view of this, the present invention aims to provide a heat-insulated and corrosion-resistant manhole device for the maintenance of a fluidized bed chlorination furnace and a fluidized bed chlorination furnace, so as to solve the problems in the prior art that require personnel to enter the furnace to work in a confined space during the maintenance of a fluidized bed chlorination furnace, resulting in low efficiency of maintenance, slag removal and other work, and high safety risks for personnel inside the furnace.

[0005] To achieve the above objectives, the technical solution of the present invention is implemented as follows:

[0006] A heat-insulating and corrosion-resistant manhole device for maintenance of a fluidized bed chlorination furnace is disclosed. The manhole device is installed in the boiling section of the fluidized bed chlorination furnace. The manhole device includes a manhole connector, a stainless steel pipe, and a manhole cover. The manhole connector is connected to the furnace shell of the fluidized bed chlorination furnace, and the manhole cover is installed at the end of the manhole connector away from the furnace shell. The stainless steel pipe is installed inside the manhole connector, and the inner wall of the manhole connector is nested with the outer wall of the stainless steel pipe. The stainless steel pipe extends toward the furnace chamber of the fluidized bed chlorination furnace and penetrates the refractory layer inside the furnace shell until it communicates with the furnace chamber of the fluidized bed chlorination furnace. At least one sealing element is installed in the cavity of the stainless steel pipe, and the sealing element can be removed from or installed in the stainless steel pipe.

[0007] Furthermore, the inner wall of the stainless steel pipe is provided with a refractory casting layer, the cavity of the stainless steel pipe is surrounded by the refractory casting layer, and the sealing element is filled in the cavity.

[0008] Furthermore, multiple claw studs are welded to the inner wall of the stainless steel pipe, and the claw studs are set inside the refractory casting layer and connected to the refractory casting layer.

[0009] Furthermore, the stainless steel pipe has a creep rupture strength ≥18MPa at 900-1000℃; the stainless steel pipe is a nickel-based high-temperature alloy stainless steel pipe.

[0010] Furthermore, the gap between the outer wall of the stainless steel pipe and the refractory layer is filled with fire mortar.

[0011] Furthermore, the sealing element is an asbestos rope.

[0012] Furthermore, a plug is provided on the side of the manhole cover facing the stainless steel pipe cavity, the plug extending toward the furnace of the fluidized bed chlorination furnace and able to fit tightly with the sealing element.

[0013] A fluidized bed chlorination furnace, wherein the fluidized bed section of the fluidized bed chlorination furnace is equipped with a heat-insulated and corrosion-resistant manhole device for maintenance of the fluidized bed chlorination furnace.

[0014] Compared with the prior art, the heat-insulated and corrosion-resistant manhole device for maintenance of a fluidized bed chlorination furnace and the fluidized bed chlorination furnace described in this invention have the following advantages:

[0015] The present invention relates to a heat-insulated and corrosion-resistant manhole device for maintenance of a fluidized bed chlorination furnace and a fluidized bed chlorination furnace. By installing a manhole device in the boiling section of the fluidized bed chlorination furnace, the furnace can be quickly slag discharged without cooling or personnel entering the furnace during maintenance. This saves time and effort, is safe and efficient, and greatly protects the personal safety of maintenance personnel.

[0016] Furthermore, by installing a stainless steel pipe inside the manhole connector and a sealing element inside the stainless steel pipe, the stainless steel pipe can protect the manhole connector from direct corrosion by high-temperature gases during production, preventing material leakage from the furnace due to damage to the manhole connector. On the other hand, it ensures that the manhole device has good sealing performance, effectively preventing the leakage of toxic gases such as titanium tetrachloride, chlorine, and hydrogen chloride from the furnace during the production of titanium tetrachloride in a fluidized bed chlorination furnace, thus protecting the lives of on-site employees.

[0017] In addition, this application uses stainless steel pipes to support and reinforce the refractory layer around the manhole by passing through the refractory layer inside the furnace shell. This ensures that the refractory layer inside the furnace shell has sufficient strength and can effectively prevent the relevant structures of the refractory layer from being corroded and eroded. To a certain extent, this helps to prevent the chlorination furnace from collapsing and is conducive to extending the operating cycle of the fluidized bed chlorination furnace. Attached Figure Description

[0018] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0019] Figure 1 This is a schematic diagram of the assembly of a heat-insulated and corrosion-resistant manhole device for maintenance of a fluidized bed chlorination furnace at the fluidized bed section of the fluidized bed chlorination furnace, as described in an embodiment of the present invention.

[0020] Figure 2 This is a schematic diagram of a heat-insulated and corrosion-resistant manhole device for maintenance of a fluidized bed chlorination furnace according to an embodiment of the present invention.

[0021] Explanation of reference numerals in the attached figures:

[0022] 1. Furnace shell; 2. Manhole pipe; 3. Stainless steel pipe; 4. Refractory castable layer; 5. Claw nail; 6. Seal; 7. Manhole cover; 8. Plug; 9. Refractory layer. Detailed Implementation

[0023] The inventive concepts of this disclosure will be described below using terminology commonly used by those skilled in the art to communicate the essence of their work to others skilled in the art. However, these inventive concepts may be embodied in many different forms and should not be construed as limited to the embodiments described herein.

[0024] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0025] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0026] In existing technologies, fluidized bed chlorination furnaces often do not have manholes in the furnace shell (especially in the fluidized bed section). When a chlorination furnace malfunctions and needs to be shut down for maintenance, the usual maintenance procedure is to allow the material inside the furnace to cool naturally to room temperature, which typically takes about a week. Then, the furnace top flange is opened, and a blower is used to replace the gas inside the furnace. Only when the oxygen content inside the furnace reaches a safe level for personnel can they enter from the top. At the same time, for the personnel operating inside the furnace, the slag is loaded into ton bags and hoisted out by the hoist on the top of the furnace, which is time-consuming and labor-intensive. Moreover, they are working in a confined space with limited (or even no) escape space, which poses a significant threat to the safety of the personnel inside the furnace.

[0027] To address the problems in existing technologies where maintenance of fluidized bed chlorination furnaces requires personnel to enter the confined space inside the furnace, resulting in low efficiency for maintenance and slag removal, and high safety risks for personnel inside the furnace, this embodiment proposes a heat-insulated and corrosion-resistant manhole device for fluidized bed chlorination furnace maintenance, as well as the fluidized bed chlorination furnace itself, as shown in the attached figure. Figure 1-2 As shown, the manhole device is installed in the boiling section of the fluidized bed chlorination furnace. The manhole device includes a manhole connector 2, a stainless steel pipe 3, and a manhole cover 7. The manhole connector 2 is connected to the furnace shell 1 of the fluidized bed chlorination furnace. The manhole cover 7 is installed at the end of the manhole connector 2 away from the furnace shell 1 for opening or sealing the manhole. The stainless steel pipe 3 is installed inside the manhole connector 2. The inner wall of the manhole connector 2 is nested with the outer wall of the stainless steel pipe 3. The stainless steel pipe 3 extends toward the furnace chamber of the fluidized bed chlorination furnace and penetrates the refractory layer 9 inside the furnace shell 1 until it communicates with the furnace chamber of the fluidized bed chlorination furnace. At least one sealing element 6 is installed in the cavity of the stainless steel pipe 3. The sealing element 6 can be removed from or installed in the stainless steel pipe 3.

[0028] When maintenance or slag removal of the chlorination furnace is required, the manhole cover 7 is opened, the sealing element 6 is removed, and operators can perform slag removal and maintenance operations from outside the chlorination furnace. After the operation is completed, the sealing element 6 is replaced, and the manhole cover 7 is closed. Therefore, by installing a manhole device in the boiling section of the fluidized bed chlorination furnace, this application allows for rapid slag removal from the furnace during maintenance without the need for cooling or personnel entering the furnace. This saves time and effort, is safe and efficient, and greatly ensures the personal safety of maintenance personnel.

[0029] Furthermore, by installing a stainless steel pipe 3 inside the manhole connector 2, and simultaneously installing a sealing element 6 inside the stainless steel pipe 3, the stainless steel pipe 3 can provide protection for the manhole connector 2, preventing high-temperature gases during the production process from directly corroding the manhole connector 2 and avoiding material leakage inside the furnace due to damage to the manhole connector 2. On the other hand, it ensures that the manhole device has good sealing performance, effectively preventing the leakage of toxic gases such as titanium tetrachloride, chlorine, and hydrogen chloride inside the furnace during the production of titanium tetrachloride in a fluidized bed chlorination furnace, thus protecting the lives of on-site employees.

[0030] Furthermore, this application utilizes a stainless steel pipe 3 to penetrate the refractory layer 9 inside the furnace shell 1. The stainless steel pipe 3 supports and reinforces the refractory layer 9 (such as refractory bricks) surrounding the manhole, ensuring sufficient strength for the refractory layer 9 within the furnace shell 1. This effectively prevents corrosion and erosion of the refractory layer 9's related structures, contributing to preventing the chlorination furnace from collapsing and extending its operating cycle. Preferably, the gap between the outer wall of the stainless steel pipe 3 and the refractory layer 9 is filled with fire mortar.

[0031] For the stainless steel pipe 3, the creep rupture strength at 900-1000℃ is ≥18MPa, ensuring sufficient support strength in high-temperature environments. This guarantees that the stainless steel pipe 3 provides long-term and effective support and reinforcement for the refractory layer 9, which is beneficial for further improving the operating cycle of the fluidized bed chlorination furnace. The stainless steel pipe 3 is preferably a nickel-based high-temperature alloy stainless steel pipe, which has good high-temperature resistance and corrosion resistance.

[0032] The inner wall of the stainless steel pipe 3 is provided with a refractory castable layer 4. Correspondingly, the cavity of the stainless steel pipe 3 is surrounded by the refractory castable layer 4, and the sealing element 6 is filled in the cavity. Thus, by setting the refractory castable layer 4, the inner wall of the stainless steel pipe 3 is protected by a partition, while the fire resistance of the stainless steel pipe 3 is further improved, which is beneficial to enhancing the heat insulation and corrosion resistance of the manhole device. Preferably, the refractory castable layer 4 is a structure formed by laying refractory castable on the inner wall of the stainless steel pipe 3, and the refractory castable layer 4 can completely cover the inner wall of the stainless steel pipe 3.

[0033] Furthermore, multiple claw studs 5 are welded to the inner wall of the stainless steel pipe 3. These claw studs 5 are also positioned within and connected to the refractory castable layer 4, thereby improving the stability of the refractory castable layer 4 on the inner wall of the stainless steel pipe 3 and preventing it from detaching from the inner wall. In the specific installation process, multiple connection points can be evenly distributed on the inner wall of the stainless steel pipe 3, with corresponding claw studs 5 welded at each connection point. Then, refractory castable is laid on the inner wall of the stainless steel pipe 3 until it submerges the claw studs 5, forming the refractory castable layer 4.

[0034] The sealing element 6 is preferably an asbestos rope, which fills the cavity. On the one hand, this gives the sealing element 6 good high temperature and corrosion resistance, which helps to improve its service life. On the other hand, due to the flexibility of the asbestos rope, the sealing element 6 can fill and seal the cavity as much as possible, which helps to ensure that the sealing element 6 has good sealing performance.

[0035] A plug 8 is provided on the side of the manhole cover 7 facing the cavity of the stainless steel pipe 3. The plug 8 extends appropriately towards the furnace chamber of the fluidized bed chlorination furnace and can fit tightly against the sealing element 6. Specifically, the side of the plug 8 facing the furnace chamber and the side wall of the plug 8 can fit tightly against the sealing element 6. Correspondingly, "tight fit" can be understood as an interference fit. This helps to further improve the sealing performance of the manhole device at the manhole cover 7, effectively preventing the leakage of toxic gases inside the furnace and ensuring the safety of on-site personnel.

[0036] In this invention, the fluidized bed chlorination furnace includes the heat-insulated and corrosion-resistant manhole device for maintenance described in this embodiment, wherein the manhole device is installed in the boiling section of the fluidized bed chlorination furnace. Based on the relevant structures and assembly relationships provided in this embodiment, the fluidized bed chlorination furnace also includes conventional chlorination furnace components such as a furnace top, distributor, and blower. Since the corresponding conventional chlorination furnace components can be directly adopted from existing technologies, they will not be described in detail here.

[0037] When maintenance is required on the fluidized bed chlorination furnace, personnel do not need to enter the furnace. Simply open the manhole cover 7 with the plug 8, clean the asbestos rope from the manhole passage, and then quickly discharge the slag from the furnace through the manhole passage. This method is time-saving, labor-saving, safe, and efficient. After the slag is discharged, the asbestos rope is packed back in, and the manhole cover 7 is tightened.

[0038] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A heat-insulated and corrosion-resistant manhole device for maintenance of a fluidized bed chlorination furnace, characterized in that, The manhole device is installed in the boiling section of the boiling chlorination furnace. The manhole device includes a manhole connector (2), a stainless steel pipe (3), and a manhole cover (7). The manhole connector (2) is connected to the furnace shell (1) of the boiling chlorination furnace. The manhole cover (7) is installed at the end of the manhole connector (2) away from the furnace shell (1). The stainless steel pipe (3) is installed inside the manhole connector (2). The inner wall of the manhole connector (2) is nested with the outer wall of the stainless steel pipe (3). The stainless steel pipe (3) extends toward the furnace chamber of the boiling chlorination furnace and penetrates the refractory layer (9) inside the furnace shell (1) until it communicates with the furnace chamber of the boiling chlorination furnace. At least one sealing element (6) is installed in the cavity of the stainless steel pipe (3). When the manhole cover (7) is open, the sealing element (6) can be removed from the stainless steel pipe (3) or installed into the stainless steel pipe (3). The inner wall of the stainless steel pipe (3) is provided with a refractory casting layer (4), the cavity of the stainless steel pipe (3) is surrounded by the refractory casting layer (4), the refractory casting layer (4) can completely cover the inner wall of the stainless steel pipe (3), the sealing element (6) is filled in the cavity, and the sealing element (6) fills and seals the cavity. The inner wall of the stainless steel pipe (3) is welded with a plurality of claw studs (5), which are set inside the refractory casting layer (4) and connected to the refractory casting layer (4).

2. The heat-insulated and corrosion-resistant manhole device for maintenance of a fluidized bed chlorination furnace according to claim 1, characterized in that, The stainless steel pipe (3) has a creep rupture strength ≥18MPa at 900-1000℃; the stainless steel pipe (3) is a nickel-based high-temperature alloy stainless steel pipe.

3. The heat-insulated and corrosion-resistant manhole device for maintenance of a fluidized bed chlorination furnace according to claim 1, characterized in that, The gap between the outer wall of the stainless steel pipe (3) and the refractory layer (9) is filled with fire mud.

4. The heat-insulated and corrosion-resistant manhole device for maintenance of a fluidized bed chlorination furnace according to claim 1, characterized in that, The sealing element (6) is an asbestos rope.

5. The heat-insulated and corrosion-resistant manhole device for maintenance of a fluidized bed chlorination furnace according to claim 1, characterized in that, The manhole cover (7) is provided with a plug (8) on the side facing the cavity of the stainless steel pipe (3). The plug (8) extends toward the furnace of the boiling chlorination furnace and can fit tightly with the seal (6).

6. A fluidized bed chlorination furnace, characterized in that, The boiling section of the fluidized bed chlorination furnace is equipped with a heat-insulated and corrosion-resistant manhole device for maintenance of the fluidized bed chlorination furnace as described in any one of claims 1-5.

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