Novel circulating fluidized system for chlorination furnace
By using a novel circulating fluidized bed chlorination system that combines high-temperature and low-temperature cyclone separators, the problems of material loss and environmental pollution during the separation of titanium tetrachloride are solved, achieving stable separation and efficient reaction, and ensuring safe operation of the equipment.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- XIAN TAO SHI ZHONG XING DIAN ZI CAI LIAO YOU XIAN GONG SI
- Filing Date
- 2017-12-30
- Publication Date
- 2026-06-02
AI Technical Summary
Titanium tetrachloride is prone to generating corrosive hydrogen chloride upon contact with air during the separation process, which wastes materials and pollutes the environment. Furthermore, it is difficult to separate from solid slurry, affecting equipment and personnel safety.
A novel circulating fluidized bed chlorination system is adopted, which includes a petroleum coke feed tank, a titanium-rich feed tank, a chlorination furnace, a high-temperature cyclone separator, and a low-temperature cyclone separator. Through the combined use of the high-temperature cyclone separator and the low-temperature cyclone separator, multiple cycles of separation and reaction of titanium tetrachloride are achieved. Combined with the design of Venturi tubes and recovery pipes, blockage is prevented and ash and heat balance is ensured.
Stable separation of titanium tetrachloride was achieved, avoiding material loss and environmental pollution, ensuring stable equipment operation, and improving separation efficiency and safety.
Smart Images
Figure CN108101104B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to circulating fluidized bed combustion technology, and in particular to a novel circulating fluidized bed system for chlorination furnaces. Background Technology
[0002] Circulating fluidized bed (CFB) combustion technology is the core of clean coal combustion power generation technology. In recent years, CFB boilers have been rapidly promoted and developed in the domestic and international power generation industry due to their excellent environmental performance, superior peak-shaving economy, good coal adaptability, and efficient combustion of low-quality fuels. Currently, CFB boilers with a capacity of 220 t / h and below have been widely adopted in China, and 410 t / h CFB boilers have begun commercial operation. A 300 MW CFB boiler demonstration project has been successfully operated at the Sichuan Baima Power Plant, and a supercritical CFB boiler demonstration project is also being planned.
[0003] Crude titanium tetrachloride is an important intermediate in the production of sponge titanium. It is typically produced by mixing titanium-rich material with crushed and dried petroleum coke, followed by high-temperature reaction with chlorine gas in a chlorination furnace. While titanium tetrachloride is liquid in storage tanks, it contains a certain amount of solid slurry sediment, which must be separated before reuse. Due to its instability, titanium tetrachloride is difficult to isolate from the external environment during separation. When air enters, it reacts to form corrosive hydrogen chloride, not only wasting the titanium tetrachloride material but also causing significant damage to separation equipment and personnel, resulting in severe environmental pollution. Summary of the Invention
[0004] The purpose of this invention is to provide a novel circulating fluidized bed chlorination system to solve the problems mentioned in the background art.
[0005] To achieve the above objectives, the present invention provides the following technical solution: a novel circulating fluidized bed chlorination system, comprising a petroleum coke feed tank, a titanium-rich feed tank, a chlorination furnace, a high-temperature cyclone separator, and a low-temperature cyclone separator, characterized in that the bottom of both the petroleum coke feed tank and the titanium-rich feed tank are provided with discharge ports, which are connected in parallel to the lower side inlet of the chlorination furnace via discharge pipes; the bottom of the chlorination furnace is also provided with multiple chlorine gas inlets, and the lower side of the chlorination furnace is also provided with a slag discharge port; the chlorine gas inlets are connected to chlorine gas pipes, and the slag discharge port is connected to a slag discharge pipe; the top of the chlorination furnace is provided with an outlet, which is connected to the side inlet of the high-temperature cyclone separator via a feed pipe; the top of the high-temperature cyclone separator is also provided with a liquid discharge port, which is connected to the side of the low-temperature cyclone separator via a liquid discharge pipe; the top of the low-temperature cyclone separator is also provided with a liquid outlet, which is connected to a condenser via a liquid outlet pipe; the bottom of the low-temperature cyclone separator is provided with a slurry outlet, which is connected to a slurry collection tank via a slurry discharge pipe.
[0006] Preferably, the drain port is vertically connected to the Venturi tube, which is connected to the side inlet of the low-temperature cyclone separator via the drain pipe. The end of the Venturi tube is inserted into a titanium tetrachloride nozzle, which faces the side inlet of the low-temperature cyclone separator.
[0007] Preferably, the side inlet of the high-temperature cyclone separator is tangent to the cross-sectional circle of the high-temperature cyclone separator.
[0008] Preferably, the high-temperature cyclone separator is provided with a discharge port at the bottom, and the discharge port is connected to the recovery pipe.
[0009] Preferably, the recovery tube includes an outer tube and an inner tube, with the outer tube sleeved on the inner tube. The inner tube has multiple micro-pores, and the outer tube has multiple annular cavities. The annular cavities are connected to nitrogen branch pipes, which in turn are connected to the main nitrogen pipe. A butterfly-shaped diffuser plate is provided inside the outer annular cavity.
[0010] Preferably, the slag discharge port is connected to the slag discharge pipe, and the slag discharge pipe is connected to the enclosed slag collection box.
[0011] This invention features a compact structure, convenient installation, stable operation, and safety and environmental friendliness. The entire reaction system is fluidized and will not clog the slag discharge pipe. The combined use of high-temperature cyclone separators and low-temperature cyclone separators ensures multiple cycles, repeated combustion, and reactions of the titanium tetrachloride mixture. Furthermore, as the separators continuously return the collected material to the chlorination furnace, ash and heat balance are achieved, ensuring stable and efficient combustion within the chlorination furnace. Attached Figure Description
[0012] Figure 1 This is a schematic diagram of the structure of the present invention;
[0013] Figure 2 This is a schematic diagram of the structure of the recycling tube of the present invention;
[0014] Figure 3 This is a schematic diagram of the high-temperature cyclone separator of the present invention;
[0015] Figure 4 This is a schematic diagram of the titanium tetrachloride nozzle of the present invention. Detailed Implementation
[0016] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0017] Please see Figure 1-4In this embodiment of the invention, the novel circulating fluidized bed chlorination system includes a petroleum coke feed tank 1, a titanium-rich feed tank 2, a chlorination furnace 3, a high-temperature cyclone separator 4, and a low-temperature cyclone separator 5. The petroleum coke feed tank and the titanium-rich feed tank are each equipped with a discharge port at their bottom. These discharge ports are connected in parallel to the lower inlet of the chlorination furnace via discharge pipes. The chlorination furnace also has multiple chlorine gas inlets at its bottom and a slag discharge port 33 at its lower side. These multiple chlorine gas inlets are connected to a chlorine gas pipe 36, and the slag discharge port 33 is connected to a slag discharge pipe 61. The slag discharge pipe 61 is connected to a closed slag collection box 6.
[0018] The chlorination furnace is equipped with an outlet 32 at the top, which is connected to the side inlet 41 of a high-temperature cyclone separator via a feed pipe 37. Figure 3 As shown, the side inlet 41 of the high-temperature cyclone separator is tangent to the cross-sectional circle of the high-temperature cyclone separator 4.
[0019] The top of the high-temperature cyclone separator is also provided with a drain port 42, which is vertically connected to the Venturi tube 810. The Venturi tube 810 is connected to the side inlet 51 of the low-temperature cyclone separator through the drain pipe 81.
[0020] like Figure 4 As shown, the end of the Venturi tube 810 is inserted into the titanium tetrachloride nozzle 8, and the titanium tetrachloride nozzle 8 is oriented toward the side inlet 51 of the cryogenic cyclone separator 5.
[0021] The high-temperature cyclone separator has a discharge port 43 at the bottom, which is connected to a recovery pipe 34. The recovery pipe 34 is connected to multiple nitrogen branch pipes 35. The recovery pipe includes an outer pipe 37 and an inner pipe 38. The outer pipe is sleeved on the inner pipe. An annular cavity 36 is provided at the connection between the outer pipe and the nitrogen branch pipe 350. The nitrogen branch pipe 350 is connected to the nitrogen main pipe 35. A butterfly diffuser plate 361 is provided in the annular cavity 36. The inner pipe is provided with multiple micro-pores 39.
[0022] The top of the low-temperature cyclone separator 5 is also provided with a liquid outlet 53, which is connected to the condenser 55 through a liquid outlet pipe 54. The bottom of the low-temperature cyclone separator is provided with a mud outlet 52, which is connected to the mud collection tank 7 through a mud discharge pipe 71.
[0023] Its working principle is as follows: The raw materials in the petroleum coke raw material tank 1 and the titanium-rich raw material tank 2 enter the chlorination furnace through the discharge pipe to react and form titanium tetrachloride. The titanium tetrachloride is in liquid state in the storage tank, but the liquid titanium tetrachloride contains a certain amount of solid mud sediment, which is separated by a high-temperature cyclone separator. The temperature inside the high-temperature cyclone separator is greater than 1000℃. After separation, some petroleum coke and titanium dioxide will enter the recovery pipe from the bottom. When the material flows back to the chlorination furnace 3 from the recovery pipe, nitrogen enters the annular cavity 36 of the outer pipe through the nitrogen branch pipe 350. After passing through the butterfly diffuser plate 360 in the annular cavity, the nitrogen diffuses and forms a certain pressure. Then, it enters the inner pipe through the micro-pores 39 on the inner pipe. This setting reduces the corrosion of the recovery pipe by chlorine and extends the service life of the recovery pipe. At the same time, the material can quickly flow back to the chlorination furnace under the pressure of nitrogen. The separated titanium tetrachloride liquid, under the action of the venturi tube 810 and the titanium tetrachloride nozzle, enters the low-temperature cyclone separator through the drain pipe 81 for further separation. The temperature inside the low-temperature cyclone separator is less than 300℃. The separated mud impurities enter the mud tank. The titanium tetrachloride is then condensed to obtain crude titanium tetrachloride.
[0024] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.
[0025] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.
Claims
1. A novel circulating fluidized bed chlorination system, comprising a petroleum coke feed tank, a titanium-rich feed tank, a chlorination furnace, a high-temperature cyclone separator, and a low-temperature cyclone separator, characterized in that... Both the petroleum coke feed tank and the titanium-rich feed tank are equipped with discharge ports at their bottoms. These discharge ports are connected in parallel to the lower side inlet of the chlorination furnace via discharge pipes. The chlorination furnace also has multiple chlorine gas inlets at its bottom and a slag discharge port at its lower side. The chlorine gas inlets are connected to chlorine gas pipes, and the slag discharge port is connected to a slag discharge pipe. The chlorination furnace has an outlet at its top, which is connected to the side inlet of a high-temperature cyclone separator via a feed pipe. The high-temperature cyclone separator also has a liquid discharge port at its top, which is connected to the side of a low-temperature cyclone separator via a liquid discharge pipe. The low-temperature cyclone separator also has a liquid outlet at its top, which is connected to a condenser via a liquid discharge pipe. The low-temperature cyclone separator has a mud discharge port at its bottom. The system includes a slurry outlet, which is connected to a slurry collection tank via a slurry discharge pipe; a liquid outlet, which is perpendicularly connected to a Venturi tube, which is connected to the side inlet of a low-temperature cyclone separator via the liquid outlet pipe; a titanium tetrachloride nozzle is inserted into the end of the Venturi tube, with the nozzle facing the side inlet of the low-temperature cyclone separator; the side inlet of the high-temperature cyclone separator is tangent to the cross-sectional circle of the high-temperature cyclone separator; the system also includes a recovery pipe, which includes an outer pipe and an inner pipe, with the outer pipe sleeved on the inner pipe; the inner pipe has multiple micro-pores; the outer pipe has multiple outer annular cavities, which are connected to nitrogen branch pipes, which are in turn connected to the main nitrogen pipe; and a butterfly-shaped diffuser plate is provided inside the outer annular cavity.
2. The novel chlorination furnace circulating fluidized bed system according to claim 1, characterized in that... The high-temperature cyclone separator is provided with a discharge port at the bottom, which is connected to a recovery pipe.
3. The novel chlorination furnace circulating fluidization system according to claim 1, characterized in that... The slag discharge port is connected to the slag discharge pipe, and the slag discharge pipe is connected to the closed slag collection box.