Material circulation device for multi-stage fluidized bed

Abstract

The utility model relates to the technical field of titanium tetrachloride production, in particular to a material circulation device for a multi-stage fluidized bed. The utility model discloses a material circulation device for a multistage fluidized bed. The material circulation device comprises a U-shaped communicating vessel and a gate valve, one end of the U-shaped communicating vessel is communicated with a discharge port of one fluidized bed, the other end of the U-shaped communicating vessel is communicated with a feed port of the other fluidized bed, and an insertion plate groove is formed in the upper portion of the middle of the U-shaped communicating vessel. The gate valve is arranged on the U-shaped communicating vessel and comprises an insertion plate which is inserted into the insertion plate groove in an up-down movable mode. According to the utility model, the U-shaped communicating vessel and the gate valve are combined between the two fluidized beds, so that the adaptive adjustment of the material conveying quantity between the two adjacent fluidized beds is realized, the requirements of materials on flowing in different fluidized beds are met, and the overall reaction efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of titanium tetrachloride production, in particular to a material flow device for a multi-stage fluidized bed. Background Art

[0002] China is a country with abundant titanium resources. The resources are mainly concentrated in Panzhihua. 2 ) has a reserve of about 870 million tons, accounting for more than 90% of the domestic titanium reserves. Titanium tetrachloride is the main raw material for industrial products such as chloride-process titanium dioxide and sponge titanium. The existing preparation of titanium tetrachloride is obtained by reacting concentrated titanium ore or titanium-rich materials with chlorine at high temperature. There are two main production processes: (1) Molten salt chlorination method, which is to place a mixture of titanium-containing raw materials and coke into a molten salt solution composed of KCl, NaCl, MgCl 2 The process is characterized by low equipment capacity, large reaction volume, and large amount of waste liquid and waste residue. It has serious environmental pollution and cannot meet the requirements of modern manufacturing industry. It is gradually being eliminated. (2) Boiling chlorination method: Boiling chlorination is to prepare titanium-containing raw materials into particles with a certain distribution, and put them into the reactor together with coke particles. Chlorine is introduced to suspend the particles for reaction. This method has high reactor efficiency, no waste liquid is generated, and there is little waste residue. It also has little impact on the environment. Therefore, boiling chlorination is the main method for preparing titanium tetrachloride.

[0003] The above method usually uses a single chlorination furnace for reaction, and the raw materials required are usually high-grade titanium slag (TiO 2 However, the grade of Panzhihua titanium ore is low, with high calcium and magnesium oxide content. Low-temperature chlorination is a form of boiling chlorination, and the raw material used is carbide slag produced by carbonization of high-titanium blast furnace slag. Due to the total grade (in terms of TiO 2 The titanium tetrachloride content is about 20% (about 20%), which is too low. It needs to be reacted in a multi-stage fluidized bed to improve the reaction efficiency. The existing boiling chlorination process cannot use low-grade titanium raw materials (high calcium and magnesium content) directly as raw materials for boiling chlorination. How to make full use of low-grade titanium ore in Panzhihua area to prepare titanium tetrachloride is a problem that needs to be solved urgently.

[0004] For the preparation of titanium tetrachloride from low-grade high-titanium slag, a multi-stage fast fluidized bed and a turbulent fluidized bed are used in series, such as the invention patent with the authorization announcement number CN1203002C, which discloses a "device and method for preparing titanium tetrachloride by chlorination of titanium-containing minerals". It uses a multi-stage fast fluidized bed and a turbulent fluidized bed in series to treat low-grade high-titanium slag process, with titanium-containing minerals and petroleum coke as solid raw materials, chlorine and oxygen as gas raw materials, and a multi-stage (3-10 stages) fast fluidized bed and a turbulent fluidized bed as reactors to carry out high-temperature chlorination reaction, and then cool it, and then perform solid-gas separation to obtain the finished product. This method has the following main shortcomings: 1) The flow of materials between the multi-stage fluidized beds is difficult to control. 2) Solid particles, especially for high-titanium slag particles with high viscosity due to the presence of magnesium chloride and calcium chloride on the surface, are easy to stick at the inlet and outlet, causing abnormal system operation and affecting the output and quality of the product. Based on this, the prior art still needs to be improved. Utility Model Content

[0005] In view of the deficiencies of the prior art, the utility model proposes a material flow device for a multi-stage fluidized bed, which can at least solve the problem that the flow of materials between the existing multi-stage fluidized beds is difficult to control.

[0006] The utility model provides a material flow device for a multi-stage fluidized bed, comprising: a U-shaped communicating vessel and a gate valve. One end of the U-shaped communicating vessel is communicated with a discharge port of a fluidized bed, the other end of the U-shaped communicating vessel is communicated with a feed port of another fluidized bed, and a gate slot is arranged above the middle of the U-shaped communicating vessel. The gate valve is arranged on the U-shaped communicating vessel, and the gate valve comprises a gate which is movably inserted in the gate slot up and down, and the up and down movement of the gate is used to adjust the connection and blocking of the two fluidized beds.

[0007] In some embodiments, the material flow device for a multi-stage fluidized bed further comprises a sealing gas pipeline and a sealing gas supply system, wherein the sealing gas supply system is connected to a gas source; an air inlet end of the sealing gas pipeline is connected to the sealing gas supply system; and an air outlet end of the sealing gas pipeline extends to a sealing portion of the gate valve.

[0008] In some embodiments, a first regulating valve, a first flow meter, a first pressure gauge and a first shut-off valve are provided on the sealed gas pipeline. The first regulating valve is used to regulate the air pressure in the sealed gas pipeline, and the first flow meter is used to display the flow of the sealing gas in the sealed gas pipeline. The first pressure gauge is used to display the air pressure in the sealed gas pipeline, and the first shut-off valve is used to control the opening and closing of the sealed gas pipeline. A second pressure gauge is provided on the U-shaped communicating vessel. The second pressure gauge is used to display the pressure in the U-shaped communicating vessel.

[0009] In some embodiments, the material flow device for a multi-stage fluidized bed further includes a gas supply system, a loosening gas pipeline and a conveying gas pipeline. The gas supply system is connected to a gas source; the air inlet ends of the loosening gas pipeline and the conveying gas pipeline are connected to the gas supply system, and the air outlet ends of the loosening gas pipeline and the conveying gas pipeline are connected to the lower part of the U-shaped communicating vessel. The air outlet end of the loosening gas pipeline extends to the inside of the U-shaped communicating vessel between the gate valve and the discharge port of the fluidized bed. The conveying gas pipeline extends to the inside of the U-shaped communicating vessel between the gate valve and the feed port of the fluidized bed.

[0010] In some embodiments, a second cut-off valve is provided on the loosening air pipeline, and the second cut-off valve is used to control the opening and closing of the loosening air pipeline.

[0011] In some embodiments, the loosening air pipeline is further provided with a second regulating valve and a second flow meter. The second regulating valve is used to regulate the gas flow in the loosening air pipeline. The second flow meter is used to display the gas flow in the loosening air pipeline.

[0012] In some embodiments, a third shut-off valve is provided on the gas delivery pipeline, and the third shut-off valve is used to control the opening and closing of the gas delivery pipeline.

[0013] In some embodiments, a third regulating valve and a third flow meter are further provided on the gas delivery pipeline, wherein the third regulating valve is used to regulate the gas flow in the gas delivery pipeline, and the third flow meter is used to display the gas flow in the gas delivery pipeline.

[0014] In some embodiments, the gate valve is a manual gate valve, a pneumatic gate valve or an electric gate valve.

[0015] In some embodiments, the gas provided by the gas source is nitrogen.

[0016] The beneficial effects of the utility model are as follows: the utility model realizes the adaptive adjustment of the material conveying amount between two adjacent fluidized beds by designing a U-shaped communicating vessel combined with a gate valve between two fluidized beds, meets the demand for material circulation in different fluidized beds, thereby realizing the reaction requirements of different fluidized beds and improving the overall reaction efficiency. Combining the control method with the material circulation device of the multi-stage fluidized bed can facilitate the precise control of the material circulation rate, providing support for the efficient operation of the low-temperature chlorination furnace. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the utility model. For ordinary technicians in this field, other embodiments can be obtained based on these drawings without paying creative work.

[0018] Figure 1 The simplified schematic diagram of the structure of the material flow device for a multi-stage fluidized bed provided by the utility model is shown.

[0019] Description of reference numerals:

[0020] 1. U-shaped communicating vessel; 2. gate valve; 3. first fluidized bed; 4. second fluidized bed; 5. sealing gas pipeline; 6. first shut-off valve; 7. first regulating valve; 8. first flow meter; 9. gas source; 10. loosening gas pipeline; 11. second shut-off valve; 12. second regulating valve; 13. second flow meter; 14. delivery gas pipeline; 15. third shut-off valve; 16. third regulating valve; 17. third flow meter; 18. first pressure gauge; 19. second pressure gauge. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the embodiments of the present invention are further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

[0022] It should be noted that all expressions using "first" and "second" in the embodiments of the present invention are for distinguishing two non-identical entities with the same name or non-identical parameters. It can be seen that "first" and "second" are only for the convenience of expression and should not be understood as limitations on the embodiments of the present invention. The subsequent embodiments will not explain this one by one.

[0023] It should be understood that the embodiments of the present invention shown in the exemplary embodiments are illustrative only. Although only a few embodiments are described in detail in the present invention, it is easy for those skilled in the art to understand that multiple modifications are feasible without actually departing from the teachings of the subject matter of the present invention. Accordingly, all such modifications should be included within the scope of the present invention. Without departing from the gist of the present invention, other replacements, modifications, changes and deletions may be made to the design, operating conditions and parameters of the following exemplary embodiments.

[0024] The present invention provides a material flow device for a multi-stage fluidized bed, which includes a U-shaped connecting vessel 1 and a gate valve 2. Figure 1As shown, the two ends of the U-shaped communicating vessel 1 are opened upward, the fluidized bed on the right is the first fluidized bed 3, and the fluidized bed on the left is the second fluidized bed 4. Then one end of the U-shaped communicating vessel 1 is connected to the discharge port of the first fluidized bed 3, and the other end of the U-shaped communicating vessel 1 is connected to the feed port of the second fluidized bed 4, and the material (such as high-temperature carbonized slag) flows in the direction indicated by the arrow. A plug-in plate groove is provided at the upper middle position of the U-shaped communicating vessel 1. The plug-in plate valve 2 is provided on the U-shaped communicating vessel 1. The plug-in plate valve 2 includes a plug-in plate that is movably inserted in the plug-in plate groove up and down. The up and down movement of the plug-in plate is used to adjust the connection and blocking of the two fluidized beds. The larger the opening, the faster the material flow rate. Specifically, the plug-in plate valve 2 is a common type of valve. The plug-in plate valve 2 is composed of a valve body, a plug-in plate, a valve stem, and a sealing member. The plug-in plate device is in the valve body and can move along the axial direction of the valve stem. When the valve stem moves upward, the plug-in plate and the valve stem move upward together to open the channel in the valve body to allow the medium to flow. At this time, the gap between the plug plate and the valve body and the valve seat is in an open state. When the valve stem moves downward, the plug plate and the valve stem move downward together, so that the plug plate and the valve body seal fit tightly to prevent the flow of medium. At this time, the gap between the plug plate and the valve body and the valve seat is in a closed state. The gap between the plug plate and the valve seat is sealed by a seal to prevent leakage of the medium. The material flow transfer device of the multi-stage fluidized bed of the present application can be applied to multi-stage fluidized beds such as two-stage and three-stage fluidized beds, and a material flow transfer device of the present application can be installed between each stage of the fluidized bed when in use.

[0025] Compared with the prior art, the utility model realizes adaptive adjustment of the material conveying amount between two adjacent fluidized beds by designing a U-shaped communicating vessel 1 combined with a gate valve 2 between two fluidized beds, meets the demand for material circulation in different fluidized beds, thereby realizing the reaction requirements of different fluidized beds and improving the overall reaction efficiency.

[0026] In some embodiments, the material flow device for a multi-stage fluidized bed further comprises a sealing gas pipeline 5 and a sealing gas supply system, wherein the sealing gas supply system is connected to a gas source 9; the air inlet end of the sealing gas pipeline 5 is connected to the sealing gas supply system; and the air outlet end of the sealing gas pipeline 5 extends to the sealing portion of the gate valve 2. The sealing gas supply system forms a tight seal by delivering gas to the sealing gas pipeline 5 and utilizing the characteristics of the air pressure and the valve structure to prevent leakage of materials.

[0027] In some embodiments, the sealing gas pipeline 5 is provided with a first regulating valve 7, a first flowmeter 8, a first pressure gauge 18 and a first shut-off valve 6. The first regulating valve 7 is used to regulate the air pressure in the sealing gas pipeline 5, and the first flowmeter 8 is used to display the flow of the sealing gas in the sealing gas pipeline 5; the first pressure gauge 18 is used to display the air pressure in the sealing gas pipeline 5, and the first shut-off valve 6 is used to control the opening and closing of the sealing gas pipeline 5. The opening of the first shut-off valve 6 indicates the opening of the sealing gas pipeline 5, and the closing of the first shut-off valve 6 indicates the closing of the sealing gas pipeline 5; the U-shaped communicating vessel 1 is provided with a second pressure gauge 19; the second pressure gauge 19 is used to display the pressure in the U-shaped communicating vessel 1. When in use, the staff can control the opening and closing of the sealing gas pipeline 5 through the first shut-off valve 6, regulate the air pressure in the sealing gas pipeline 5 through the first regulating valve 7, the air pressure in the sealing gas pipeline 5 is displayed by the first pressure gauge 18, the air pressure in the U-shaped communicating vessel 1 is displayed by the second pressure gauge 19, and the gas flow in the sealing gas pipeline 5 can be displayed by the first flowmeter 8, so as to facilitate the control of the sealing gas as needed.

[0028] In some embodiments, the material flow device for a multi-stage fluidized bed further includes a gas supply system, a loosening gas pipeline 10 and a conveying gas pipeline 14. The gas supply system is connected to the gas source 9. The air inlet ends of the loosening gas pipeline 10 and the conveying gas pipeline 14 are connected to the gas supply system, and the air outlet ends of the loosening gas pipeline 10 and the conveying gas pipeline 14 are connected to the lower part of the U-shaped communicating vessel 1. Among them, the air outlet end of the loosening gas pipeline 10 extends to the inside of the U-shaped communicating vessel 1 between the gate valve 2 and the discharge port of the first fluidized bed 3. The conveying gas pipeline 14 extends to the inside of the U-shaped communicating vessel 1 between the gate valve 2 and the feed port of the second fluidized bed 4. When the material is circulated, gas can be introduced into the corresponding position inside the U-shaped communicating vessel 1, wherein the loosening gas is used to break up the material to form a fluidized state, and the conveying gas is used to transport the material in the fluidized state to the fluidized bed of the next stage. Prevent the material from sticking at the inlet and outlet to affect the operation of the system and improve the material flow efficiency.

[0029] In some embodiments, a second shut-off valve 11 is provided on the loosening air pipeline 10. The second shut-off valve 11 is used to control the opening and closing of the loosening air pipeline 10. The opening of the second shut-off valve 11 indicates that the loosening air pipeline 10 is opened, and the closing of the second shut-off valve 11 indicates that the loosening air pipeline 10 is closed. Through the arrangement of the above device, the opening and closing of the loosening air pipeline 10 can be conveniently controlled.

[0030] In some embodiments, the loosening gas pipeline 10 is further provided with a second regulating valve 12 and a second flow meter 13. The second regulating valve 12 is used to adjust the gas flow in the loosening gas pipeline 10. The second flow meter 13 is used to display the gas flow in the loosening gas pipeline 10. Through the arrangement of the above-mentioned devices, the flow of the loosening gas can be accurately and conveniently adjusted. The loosening gas flow is designed according to the fluidizing gas velocity required by the material. The larger the gas flow, the faster the material flow rate.

[0031] In some embodiments, a third shut-off valve 15 is provided on the delivery gas pipeline 14, and the third shut-off valve 15 is used to control the opening and closing of the delivery gas pipeline 14. When the third shut-off valve 15 is opened, it means that the delivery gas pipeline 14 is opened, and when the third shut-off valve 15 is closed, it means that the delivery gas pipeline 14 is closed. Through the arrangement of the above device, the opening and closing of the delivery gas pipeline 14 can be conveniently controlled.

[0032] In some embodiments, the third regulating valve 16 is used to adjust the gas flow in the gas delivery pipeline 14; the third flow meter 17 is used to display the gas flow in the gas delivery pipeline 14. Through the arrangement of the above devices, the flow of the delivery gas can be accurately and conveniently adjusted.

[0033] In some embodiments, the gate valve 2 is a manual gate valve, a pneumatic gate valve or an electric gate valve. Gate valves 2 with different control modes are suitable for different working conditions and needs.

[0034] In some embodiments, the gas provided by the gas source 9 is nitrogen. Nitrogen is selected as sealing gas, loosening gas and conveying gas based on its advantages in many aspects, including chemical inertness, oxidation prevention, thermal stability, cost-effectiveness, environmental friendliness and wide material and technical compatibility.

[0035] The control method of the material flow device of the multi-stage fluidized bed proposed by the utility model comprises the following steps:

[0036] S1, open the sealing gas pipeline 5 through the first shut-off valve 6, so that the sealing gas supply system can ventilate the sealing gas pipeline 5; adjust the air pressure of the sealing gas pipeline 5 through the first regulating valve 7, so that the difference between the air pressure displayed by the first pressure gauge 18 and the air pressure displayed by the second pressure gauge 19 is within the preset air pressure range; wherein a positive pressure difference is formed between the first pressure gauge 18 and the second pressure gauge 19, in other words, the air pressure value displayed by the first pressure gauge 18 should be greater than the air pressure value displayed by the second pressure gauge 19, and the air pressure needs to be kept under control during the entire production operation to prevent leakage of high-temperature materials.

[0037] S2, when one fluidized bed needs to discharge material to another fluidized bed, the plug plate is adjusted to a preset opening, such as about 30%, and then the loosening gas pipeline 10 and the conveying gas pipeline 14 are opened through the second shut-off valve 11 and the third shut-off valve 15 respectively, so that the gas supply system introduces gas to the corresponding position inside the U-shaped communicating vessel 1; and the flow rate of the gas in the loosening gas pipeline 10 is controlled within a first preset flow rate range through the second regulating valve 12 and the third regulating valve 16, and the flow rate of the gas in the conveying gas pipeline 14 is controlled within a second preset flow rate range; wherein the second preset flow rate range is greater than the first preset flow rate range; the ratio of the loosening gas volume to the conveying gas volume can be controlled at about 0.2-0.3, so that the material in the U-shaped communicating vessel 1 can flow better to the other fluidized bed.

[0038] S3, when the material layer in the fluidized bed meets the process control requirements, first close the gate valve 2, then close the second shut-off valve 11 and the third shut-off valve 15, cut off the loosening gas pipeline 10 and the delivery gas pipeline 14, and stop supplying gas to the U-shaped communicating vessel 1;

[0039] S4, repeating steps S2 and S3; thereby achieving material flow between the two fluidized beds;

[0040] S5, after use, close the first shut-off valve 6. The entire circulation system stops. Through the coordination of multiple devices, the material can be discharged from the raw material into the furnace to the tailings after the reaction.

[0041] In some embodiments, the preset air pressure range is 20-50 kPa, which can meet the sealing requirements of the gate valve 2.

[0042] In some embodiments, the first preset flow rate range is 5-50Nm 3 / h; the second preset flow range is 20-200Nm 3 / h to meet the material flow needs.

[0043] In some embodiments, the preset opening of the plug plate is 20%-80%, and its size is positively correlated with the required material flow rate.

[0044] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0045] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the utility model patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. A material flow device for a multi-stage fluidized bed, characterized in that: include: A U-shaped communicating vessel (1), one end of the U-shaped communicating vessel (1) being connected to a discharge port of a fluidized bed, the other end of the U-shaped communicating vessel (1) being connected to a feed port of another fluidized bed, and a plug-in plate groove being provided above the middle of the U-shaped communicating vessel (1); A gate valve (2) is provided on the U-shaped communicating vessel (1), the gate valve (2) comprising a gate which is movably inserted in the gate slot up and down, and the up and down movement of the gate is used to adjust the connection and blocking of the two fluidized beds.

2. The material flow device for a multi-stage fluidized bed according to claim 1, characterized in that: It also comprises a sealing gas pipeline (5) and a sealing gas supply system, wherein the sealing gas supply system is connected to a gas source (9); the air inlet end of the sealing gas pipeline (5) is connected to the sealing gas supply system; and the air outlet end of the sealing gas pipeline (5) extends to the sealing portion of the gate valve (2).

3. The material flow device for a multi-stage fluidized bed according to claim 2, characterized in that: The sealing gas pipeline (5) is provided with a first regulating valve (7), a first flow meter (8), a first pressure gauge (18) and a first shut-off valve (6); the first regulating valve (7) is used to regulate the air pressure in the sealing gas pipeline (5), and the first flow meter (8) is used to display the flow rate of the sealing gas in the sealing gas pipeline (5); the first pressure gauge (18) is used to display the air pressure in the sealing gas pipeline (5), and the first shut-off valve (6) is used to control the opening and closing of the sealing gas pipeline (5); the U-shaped communicating vessel (1) is provided with a second pressure gauge (19); the second pressure gauge (19) is used to display the pressure in the U-shaped communicating vessel (1).

4. The material flow device for a multi-stage fluidized bed according to claim 2, characterized in that: It also includes a gas supply system, a loosening gas pipeline (10) and a conveying gas pipeline (14); the gas supply system is connected to the gas source (9); the air inlet ends of the loosening gas pipeline (10) and the conveying gas pipeline (14) are connected to the gas supply system, and the air outlet ends of the loosening gas pipeline (10) and the conveying gas pipeline (14) are connected to the lower part of the U-shaped communicating vessel (1); wherein the air outlet end of the loosening gas pipeline (10) extends to the inside of the U-shaped communicating vessel (1) between the gate valve (2) and the discharge port of one fluidized bed; and the conveying gas pipeline (14) extends to the inside of the U-shaped communicating vessel (1) between the gate valve (2) and the feed port of another fluidized bed.

5. The material flow device for a multi-stage fluidized bed according to claim 4, characterized in that: The loosening air pipeline (10) is provided with a second cut-off valve (11); the second cut-off valve (11) is used to control the opening and closing of the loosening air pipeline (10).

6. The material flow device for a multi-stage fluidized bed according to claim 5, characterized in that: The loosening gas pipeline (10) is also provided with a second regulating valve (12) and a second flow meter (13); the second regulating valve (12) is used to regulate the gas flow in the loosening gas pipeline (10); and the second flow meter (13) is used to display the gas flow in the loosening gas pipeline (10).

7. The material flow device for a multi-stage fluidized bed according to claim 4, characterized in that: The delivery gas pipeline (14) is provided with a third shut-off valve (15); the third shut-off valve (15) is used to control the opening and closing of the delivery gas pipeline (14).

8. The material flow device for a multi-stage fluidized bed according to claim 7, characterized in that: The delivery gas pipeline (14) is also provided with a third regulating valve (16) and a third flow meter (17); the third regulating valve (16) is used to regulate the gas flow in the delivery gas pipeline (14); and the third flow meter (17) is used to display the gas flow in the delivery gas pipeline (14).

9. The material flow device for a multi-stage fluidized bed according to claim 1, characterized in that: The gate valve (2) is a manual gate valve, a pneumatic gate valve or an electric gate valve.

10. The material flow device for a multi-stage fluidized bed according to claim 4, characterized in that: The gas provided by the gas source (9) is nitrogen.

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