Method for preventing blockage of vacuum distillation channel during production of titanium sponge in inverted u-shaped furnace

Abstract

A method for preventing blockage of a vacuum distillation channel during production of titanium sponge in an inverted U-shaped furnace, comprising an electric distillation furnace heating step, a low vacuum distillation step, and a high vacuum distillation step. In the electric distillation furnace heating step, the temperatures of zones 1 and 2 of an electric distillation furnace are controlled to be 950°C-980°C, the temperatures of zones 3 and 4 of the electric distillation furnace are controlled to be 900°C-980°C, and the temperatures of zones 5 and 6 of the electric distillation furnace are controlled to be 920°C-980°C. The method of the present invention can prevent condensation of evaporated Mg and MgCl2 gases at a condenser channel, ensuring the quality of titanium sponge.

Description

A method for preventing blockage of vacuum distillation channels in the production of sponge titanium using an inverted U-shaped furnace.

[0001] This application claims priority to Chinese Patent Application No. 202411734546.X, filed on November 29, 2024, entitled "A Method for Preventing Blockage of Vacuum Distillation Channel in the Production of Sponge Titanium in an Inverted U-Shaped Furnace", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This invention relates to the field of sponge titanium production technology, and in particular to a method for preventing blockage of the vacuum distillation channel in an inverted U-shaped furnace for producing sponge titanium. Background Technology

[0003] Industrially, sponge titanium is produced using the magnesiothermal reduction method, which consists of two steps: magnesium reduction and vacuum distillation. The vacuum distillation step separates the residual MgCl2, Mg, and incompletely reduced low-valent titanium chloride from the sponge titanium, yielding pure sponge titanium. The separated MgCl2 and Mg solidify on the walls of a condenser, while the sponge titanium remains inside the distillation vessel as the product.

[0004] Currently, sponge titanium manufacturers employ two production processes: the I-type furnace and the inverted U-type furnace. Both types require a conduit to connect the distillation tank and the condenser during the vacuum distillation stage. During distillation, residual MgCl2 and Mg in the distillation tank are distilled out under high temperature and high vacuum conditions and then enter the condenser through the conduit. The I-type furnace is named for the I-shaped structure formed by the distillation tank and condenser after installation during vacuum distillation. In an I-type furnace, the distillation tank and condenser are arranged vertically with a conduit in between, and cooling water nozzles are installed on the condenser for forced cooling. When distillation process conditions are not properly controlled, the distillation channel is prone to blockage. Blockage forces a halt to distillation, requiring the tank to cool to room temperature, replace the high-temperature baffle and condenser, and then reassemble and reheat for distillation. Blockage in the distillation channel directly affects the smooth operation of distillation production, increasing furnace occupancy time and power consumption. Furthermore, the return of impurities to the furnace makes it difficult to completely separate the sponge titanium, affecting its quality.

[0005] The inverted U-shaped furnace connects the distillation tank and condenser via a central channel, arranged in an inverted "U" shape. Vaporized vapor enters the condenser from the distillation tank and condenses on its inner surface. The channel pipes are externally heated to ensure the condensate flows smoothly into the condenser. In actual production, if the distillation process is not properly controlled, vapor can condense at the condenser inlet, eventually blocking the channel. When the channel is blocked, manual unblocking is required, reducing production efficiency and increasing labor intensity. To solve the technical problem of channel blockage in the vacuum distillation process of the inverted "U"-shaped furnace, the industry has proposed using a MgCl2 exhaust pipe as a evacuation pipe to control the flow direction of Mg and MgCl2 gases, and also proposed a method of periodically unblocking the distillation channel using mechanical methods.

[0006] Chinese patent application CN202410421356.6 discloses a process control method for preventing blockage of the distillation channel in the production of sponge titanium in an inverted U-shaped furnace. The method mainly includes the following steps: during the reduction feeding process, the feeding rate is reduced when the feeding amount reaches 50%-60% of the target total feeding amount; when the feeding amount reaches 80%-85% of the target feeding amount, the reduction feeding endpoint is determined based on the pressure relief situation, and feeding is stopped in a timely manner; during the reduction feeding process, the liquid level fluctuation is controlled at 60-70 cm in the early and middle stages of reduction, and at 30-40 cm in the later and final stages of reduction; after reduction, the components are assembled according to normal production procedures, and then the temperature is increased. This patent's process control method for preventing blockage of the distillation channel in the production of sponge titanium in an inverted U-shaped furnace mainly controls the magnesia reduction reaction process to prevent secondary reactions and the formation of metallic titanium that can block the channel. However, the control effect of this patent method is not ideal, and the phenomenon of evaporated Mg and MgCl2 gases condensing at the channel end of the condenser still exists.

[0007] Therefore, there is an urgent need for a process control method to prevent blockage of the distillation channel in the production of sponge titanium in an inverted U-shaped furnace. This method would prevent the evaporated Mg and MgCl2 gases from condensing in the condenser channel by controlling the process parameters of distillation and condensation and the operation steps, thereby preventing channel blockage and ensuring the quality of the sponge titanium. Summary of the Invention

[0008] The purpose of this invention is to provide a method for preventing blockage of the vacuum distillation channel in the production of sponge titanium using an inverted U-shaped furnace. The method includes a distillation furnace temperature control step, a channel temperature control step, a low-vacuum distillation step, and a high-vacuum distillation step, thereby preventing the evaporated Mg and MgCl2 gases from condensing at the condenser channel, preventing channel blockage, and ensuring the quality of the sponge titanium.

[0009] To achieve the above-mentioned objectives, this invention provides a method for preventing blockage of the vacuum distillation channel in the production of sponge titanium using an inverted U-shaped furnace. The method includes a heating step in the distillation furnace, a low-vacuum distillation step, and a high-vacuum distillation step. In the heating step, the temperature of zones 1 and 2 of the distillation furnace is controlled at 950℃~980℃, the temperature of zones 3 and 4 is controlled at 900℃~980℃, and the temperature of zones 5 and 6 is controlled at 920℃~980℃. The bottom of the distillation furnace is set as a reference plane. The temperature measuring point in zone 1 is 5.5±0.5 meters from the reference plane, the temperature measuring point in zone 2 is 4.5±0.5 meters, the temperature measuring point in zone 3 is 3.5±0.5 meters, the temperature measuring point in zone 4 is 2.5±0.2 meters, the temperature measuring point in zone 5 is 1.5±0.2 meters, and the temperature measuring point in zone 6 is 0.5±0.1 meters from the bottom.

[0010] According to the present invention, a method for preventing blockage of the vacuum distillation channel in the production of sponge titanium in an inverted U-shaped furnace is preferably implemented in the heating step of the distillation furnace, wherein the temperature of points 1 and 2 in the channel is controlled at 850°C to 880°C, and the temperature of point 3 in the channel is controlled at 850°C to 900°C; wherein the temperature measuring point of point 1 in the channel is located at the beginning of the channel pipe, the temperature measuring point of point 2 in the channel pipe is located in the middle of the channel pipe, and the temperature measuring point of point 3 in the channel pipe is located at the end of the channel pipe.

[0011] According to the method for preventing blockage of the vacuum distillation channel in the production of sponge titanium in an inverted U-shaped furnace according to the present invention, preferably, the duration of low vacuum distillation in the low vacuum distillation step is 20h to 30h; wherein, the vacuum pressure of the vacuum unit for low vacuum distillation is >20Pa.

[0012] According to the present invention, a method for preventing blockage of the vacuum distillation channel in the production of sponge titanium in an inverted U-shaped furnace is preferably implemented in the low vacuum distillation step when the temperature detected in the condenser is ≤420℃ or the low vacuum duration is >30h, and the high vacuum distillation step is initiated; wherein, the vacuum pressure of the vacuum unit in the high vacuum distillation is ≤20Pa.

[0013] According to the present invention, a method for preventing blockage of the vacuum distillation channel in the production of sponge titanium in an inverted U-shaped furnace is preferably wherein, during the high vacuum distillation step, the opening degree of the inlet valve of the cooling water jacket is controlled to be 35% to 50% within 0 to 30 hours of high vacuum distillation.

[0014] According to the present invention, a method for preventing blockage of the vacuum distillation channel in the production of sponge titanium in an inverted U-shaped furnace is preferably wherein, in the high vacuum distillation step, when the temperature detected in the condenser is below 300°C, the opening of the inlet valve of the cooling water jacket is adjusted to 20% to 30%.

[0015] According to the present invention, a method for preventing blockage of the vacuum distillation channel in the production of sponge titanium in an inverted U-shaped furnace is preferably wherein, during the high vacuum distillation step, the opening of the inlet valve of the cooling water jacket is controlled to be 20% to 30% within 30 to 90 hours of high vacuum distillation.

[0016] According to the present invention, a method for preventing blockage of the vacuum distillation channel in the production of sponge titanium in an inverted U-shaped furnace is preferably wherein, in the high vacuum distillation step, when the temperature detected in the condenser is below 250°C, the opening of the inlet valve of the cooling water jacket is adjusted to 10% to 20%.

[0017] According to the present invention, a method for preventing blockage of the vacuum distillation channel in the production of sponge titanium in an inverted U-shaped furnace preferably includes a channel blockage judgment step: during the process from the start of distillation to 120 hours of distillation, if the system pressure drops below 1 Pa and shows a continuous downward trend, and at the same time the pressure in the distillation tank continues to rise while the temperature detected in the condenser continues to drop, it is judged that a blockage has occurred; wherein, the temperature monitoring point of the system pressure is set on the connecting pipeline between the outlet of the condenser and the outlet of the vacuum unit.

[0018] According to the present invention, a method for preventing blockage of the vacuum distillation channel in the production of sponge titanium in an inverted U-shaped furnace is preferably described in the channel blockage judgment step, during the process from the start of distillation to 120 hours of distillation, when the temperature of the condenser drops below 200°C and the rate of temperature drop in the condenser is greater than 30°C / h, a blockage is judged to have occurred.

[0019] The beneficial effects of this invention are:

[0020] The present invention provides a method for preventing blockage of the vacuum distillation channel in the production of sponge titanium using an inverted U-shaped furnace. The method includes a distillation furnace temperature control step, a channel temperature control step, a low-vacuum distillation step, and a high-vacuum distillation step, thereby preventing the evaporated Mg and MgCl2 gases from condensing and blocking the channel at the condenser channel, while ensuring the quality of the sponge titanium. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other embodiments can be obtained based on these drawings without creative effort.

[0022] Figure 1 is a schematic diagram of the apparatus structure for a method of preventing blockage of the vacuum distillation channel in the production of sponge titanium in an inverted U-shaped furnace according to the present invention.

[0023] Among them, 1-distillation tank, 2-distillation furnace, 3-feeding inlet, 4-condenser, 5-cooling water jacket, 6-vacuum unit, 7-cooling water jacket, 8-external heater, 10-connecting pipe. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be further described in detail below with reference to specific examples and the accompanying drawings.

[0025] Currently, as shown in Figure 1, the inverted U-shaped furnace includes a distillation tank 1 and a condenser tank 4, which are connected by a central channel pipe 7. The distillation tank is heated by a distillation electric furnace 2. The distillation tank 1 and condenser tank 4 are arranged in an inverted "U" shape. The volatile vapors enter the condenser tank 4 from the distillation tank 1 through the channel pipe 7. The condenser tank 4 is equipped with a cooling water jacket 5 to cool it, and condensation occurs on the inner surface of the condenser tank 4. The cooling water jacket 7 uses an external heater 8 to ensure that the evaporated condensate can smoothly enter the condenser tank 4 through the channel. TiCl4 is fed into the distillation tank 4 through the feed inlet 3.

[0026] In existing technology, to control the flow direction of Mg and MgCl2 gases, a vacuum unit is added to evacuate the condenser system. The inlet of the vacuum unit is connected to the outlet of the condenser 4 via pipe 10 to solve the technical problem of channel blockage in the vacuum distillation process of the inverted "U" shaped furnace. The temperature detection point of the condenser 4 is a temperature sensor inserted inside the tank; the system pressure detection point is located on the connecting pipe 10 between the condenser outlet and the vacuum unit inlet.

[0027] This invention provides a method for preventing blockage of the vacuum distillation channel in the production of sponge titanium using an inverted U-shaped furnace, comprising a distillation furnace heating step, a low-vacuum distillation step, and a high-vacuum distillation step. In a more preferred embodiment, the method further includes a channel blockage determination step.

[0028] The heating step of the distillation furnace includes: controlling the temperature of zones 1 and 2 of the distillation furnace at 950℃~980℃, the temperature of zones 3 and 4 at 900℃~980℃, and the temperature of zones 5 and 6 at 920℃~980℃; wherein, the bottom of the distillation furnace is set as the reference plane, and the temperature measuring point of zone 1 is 5.5±0.5 meters away from the reference plane, the temperature measuring point of zone 2 is 4.5±0.5 meters away from the reference plane, the temperature measuring point of zone 3 is 3.5±0.5 meters away from the reference plane, the temperature measuring point of zone 4 is 2.5±0.2 meters away from the reference plane, the temperature measuring point of zone 5 is 1.5±0.2 meters away from the reference plane, and the temperature measuring point of zone 6 is 0.5±0.1 meters away from the bottom.

[0029] The low-vacuum distillation step also includes: controlling the temperature of points 1 and 2 in the distillation furnace heating step at 850℃~880℃, and the temperature of point 3 in the channel at 850℃~900℃; wherein, the temperature measuring point of point 1 is located at the beginning of the channel pipe, the temperature measuring point of point 2 is located in the middle of the channel pipe, and the temperature measuring point of point 3 is located at the end of the channel pipe.

[0030] The low-vacuum distillation step includes: a low-vacuum distillation duration of 20h to 30h; wherein the vacuum pressure of the vacuum unit for low-vacuum distillation is >20Pa; preferably, in the low-vacuum distillation step, when the temperature detected in the condenser is ≤420℃ or the low-vacuum duration is >30h, the high-vacuum distillation step is started; wherein the vacuum pressure of the vacuum unit for high-vacuum distillation is ≤20Pa.

[0031] The high-vacuum distillation step includes: controlling the opening of the cooling water jacket inlet valve to 35% to 50% during the 0 to 30 hours of high-vacuum distillation; preferably, when the temperature detected in the condenser is below 300°C, adjusting the opening of the cooling water jacket inlet valve to 20% to 30%; more preferably, controlling the opening of the cooling water jacket inlet valve to 20% to 30% during the 30 to 90 hours of high-vacuum distillation.

[0032] As a specific embodiment of the present invention, in the high vacuum distillation step, when the temperature detected in the condenser is below 250°C, the opening of the inlet valve of the cooling water jacket is adjusted to 10% to 20%.

[0033] Regarding the channel blockage judgment step: During the process from the start of distillation in the distillation tank to 120 hours of distillation, the system pressure drops below 1 Pa and shows a continuous downward trend; at the same time, the pressure in the distillation tank continues to rise, and the temperature detected in the condenser continues to decrease; wherein, the temperature monitoring point of the system pressure is set on the connecting pipeline between the outlet of the condenser and the outlet of the vacuum unit; preferably, in the channel blockage judgment step, during the process from the start of distillation in the distillation tank to 120 hours of distillation, when the temperature detected in the condenser drops below 200℃, and the rate of decrease of the temperature detected in the condenser is greater than 30℃ / h.

[0034] Example 1

[0035] This embodiment provides a method for preventing blockage of the vacuum distillation channel in an inverted U-shaped furnace during the production of sponge titanium, specifically including the following steps:

[0036] (1) Assemble the external heater 8 on the channel pipe 7 of the inverted U-shaped furnace that has passed the pressure control test;

[0037] (2) The temperature of zones 1 and 2 of the distillation furnace 2 is controlled at 950℃, the temperature of zones 3 and 4 of the distillation furnace 2 is controlled at 900℃, and the temperature of zones 5 and 6 of the distillation furnace 2 is controlled at 920℃; the temperature of points 1 and 2 of the channel pipe 7 is controlled at 850℃, and the temperature of point 3 of the channel pipe 7 is controlled at 880℃.

[0038] (3) First, start the vacuum pump 6 to perform low vacuum distillation operation. The low vacuum distillation lasts for 22 hours. The detection temperature of the condenser 4 drops to 410℃. At this time, adjust the vacuum degree of the vacuum pump 6 to start the high vacuum distillation operation.

[0039] (4) After the high vacuum distillation is started, the opening of the water inlet valve of the cooling water jacket 5 is controlled at 40% for the first 30 hours; from 30 to 90 hours, the opening of the water inlet valve of the cooling water jacket 5 is controlled at 25%; this continues until the vacuum distillation ends.

[0040] The entire vacuum distillation stage of producing sponge titanium in the inverted U-shaped furnace proceeded smoothly without any channel blockage issues. The produced sponge titanium did not exceed the chlorine impurity limit, and the chlorine content was 0.038%, meeting the national standard product quality requirements.

[0041] Example 2

[0042] This embodiment provides a method for preventing blockage of the vacuum distillation channel in an inverted U-shaped furnace during the production of sponge titanium, specifically including the following steps:

[0043] (1) Assemble the external heater 8 on the channel pipe 7 of the inverted U-shaped furnace that has passed the pressure control test;

[0044] (2) The temperature of zones 1 and 2 of the distillation furnace 2 is controlled at 960℃, the temperature of zones 3 and 4 of the distillation furnace 2 is controlled at 950℃, the temperature of zones 5 and 6 of the distillation furnace 2 is controlled at 960℃; the temperature of points 1 and 2 of the channel pipe 7 is controlled at 860℃, and the temperature of point 3 of the channel pipe 7 is 880℃.

[0045] (3) First, start vacuum pump 6 to perform low vacuum distillation. The low vacuum distillation lasts for 30 hours. The detection temperature of condenser 4 drops to 430℃. At this time, adjust the vacuum degree of vacuum pump 6 to perform high vacuum distillation.

[0046] (4) After the high vacuum distillation is started, the opening of the inlet valve of the cooling water jacket 5 is controlled at 45% for the first 30 hours; from 30 to 70 hours, the opening of the inlet valve of the cooling water jacket 5 is controlled at 20%; when the measured temperature of the condenser 4 is 240℃, the opening of the inlet valve of the cooling water jacket 5 is adjusted to 15% and continued until the vacuum distillation is finished.

[0047] The entire vacuum distillation stage of producing sponge titanium in the inverted U-shaped furnace proceeded smoothly without any channel blockage issues. The produced sponge titanium did not exceed the chlorine impurity limit, and the chlorine content was 0.042%, meeting the national standard product quality requirements.

[0048] Example 3

[0049] This embodiment provides a method for preventing blockage of the vacuum distillation channel in an inverted U-shaped furnace during the production of sponge titanium, specifically including the following steps:

[0050] (1) Assemble the external heaters in the channel pipes of the inverted U-shaped furnace that have passed the pressure control test;

[0051] (2) The temperature of zones 1 and 2 of the distillation furnace 2 is controlled at 900℃, the temperature of zones 3 and 4 of the distillation furnace 2 is controlled at 930℃, and the temperature of zones 5 and 6 of the distillation furnace 2 is controlled at 920℃; the temperature of points 1 and 2 of the channel pipe 7 is controlled at 850℃, and the temperature of point 3 of the channel pipe 7 is 850℃.

[0052] (3) First, start vacuum pump 6 to begin low vacuum distillation. The low vacuum distillation lasts for 30 hours. When the temperature detected by condenser 4 drops to 430℃, adjust the vacuum level of vacuum pump 6 to perform high vacuum distillation.

[0053] (4) After the high vacuum distillation is started, the opening of the inlet valve of the cooling water jacket 5 is controlled at 45% for the first 30 hours; from 30 to 60 hours, the opening of the inlet valve of the cooling water jacket 5 is controlled at 30%; when the measured temperature of the condenser 4 is 200℃, the opening of the inlet valve of the cooling water jacket 5 is adjusted to 15%; from 60 to 80 hours, when the detected temperature of the condenser 4 drops at a rate of 35℃ / h, it is determined that the channel is blocked, and manual cleaning of the blocked part is started, and the process parameters are finely adjusted until the vacuum distillation is completed.

[0054] The produced sponge titanium has a relatively high impurity content of chlorine, with a content of 0.064%, which does not meet the quality requirements of Grade 0 products in the national standard.

[0055] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the invention (including the claims) is limited to these examples. Within the framework of the invention, technical features of the above embodiments or different embodiments can be combined, and many other variations of the different aspects of the invention as described above exist, which are not provided in the details for the sake of brevity. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the invention should be included within the protection scope of the invention.

Claims

1. A method for preventing the clogging of the vacuum distillation passage in the production of titanium sponge by an inverted U-shaped furnace, comprising a distillation electric furnace heating step, a low vacuum distillation step, and a high vacuum distillation step, characterized by, In the heating step of the distillation furnace, the temperature of zones 1 and 2 is controlled at 950℃~980℃, the temperature of zones 3 and 4 is controlled at 900℃~980℃, and the temperature of zones 5 and 6 is controlled at 920℃~980℃; among these... The bottom of the distillation furnace is set as the reference plane. The temperature measuring point in zone 1 of the distillation furnace is 5.5±0.5 meters away from the reference plane, the temperature measuring point in zone 2 is 4.5±0.5 meters away from the reference plane, the temperature measuring point in zone 3 is 3.5±0.5 meters away from the reference plane, the temperature measuring point in zone 4 is 2.5±0.2 meters away from the reference plane, the temperature measuring point in zone 5 is 1.5±0.2 meters away from the reference plane, and the temperature measuring point in zone 6 is 0.5±0.1 meters away from the bottom.

2. The method for preventing the vacuum distillation passage from being blocked during the production of titanium sponge by the inverted U-shaped furnace according to claim 1, characterized in that, In the heating step of the distillation furnace, the temperature at points 1 and 2 is controlled at 850℃~880℃, and the temperature at point 3 is controlled at 850℃~900℃; among these... The temperature measuring point at point 1 is located at the beginning of the channel pipe, the temperature measuring point at point 2 is located in the middle of the channel pipe, and the temperature measuring point at point 3 is located at the end of the channel pipe.

3. The method for preventing the vacuum distillation passage from being blocked during the production of titanium sponge by the inverted U-shaped furnace according to claim 2, characterized in that, In the low-vacuum distillation step, the duration of low-vacuum distillation is 20h to 30h; among which, The vacuum pressure of the vacuum unit for low-vacuum distillation is >20Pa.

4. The method for preventing the vacuum distillation passage from being blocked during the production of titanium sponge by the inverted U-shaped furnace according to claim 3, characterized in that, In the low-vacuum distillation step, when the temperature inside the condenser is ≤420℃ or the low-vacuum duration is >30h, the high-vacuum distillation step is initiated; among which... The vacuum pressure of the vacuum unit for high-vacuum distillation is ≤20Pa.

5. The method for preventing the vacuum distillation passage from being blocked during the production of titanium sponge by the inverted U-shaped furnace according to claim 1, characterized in that, During the high vacuum distillation step, the opening degree of the cooling water jacket inlet valve is controlled to be 35% to 50% within 0 to 30 hours of high vacuum distillation.

6. The method for preventing the vacuum distillation passage of the titanium sponge production in the inverted U-shaped furnace from being blocked according to claim 5, characterized in that, During the high-vacuum distillation step, when the temperature inside the condenser is below 300°C, adjust the opening of the cooling water jacket inlet valve to 20%–30%.

7. The method for preventing the vacuum distillation passage from being blocked during the production of titanium sponge by the inverted U-shaped furnace according to claim 1, characterized in that, During the high vacuum distillation process, the opening of the cooling water jacket inlet valve is controlled to be 20% to 30% during the 30 to 90 hours of high vacuum distillation.

8. The method for preventing the vacuum distillation passage of the titanium sponge production in the inverted U-shaped furnace from being blocked according to claim 7, characterized in that, During the high-vacuum distillation step, when the temperature inside the condenser is below 250°C, adjust the opening of the cooling water jacket inlet valve to 10%–20%.

9. The method for preventing the vacuum distillation passage from being blocked during the production of titanium sponge by the inverted U-shaped furnace according to claim 1, characterized in that, It also includes a channel blockage detection step: during the process from the start of distillation to 120 hours of distillation, if the system pressure drops below 1 Pa and shows a continuous downward trend, while the distillation tank pressure continues to rise and the temperature detected in the condenser continues to drop, a blockage is determined to have occurred; among these... The temperature monitoring point for system pressure is located on the connecting pipeline between the outlet of the condenser tank and the outlet of the vacuum unit.

10. The method for preventing the vacuum distillation passage of the titanium sponge production in the inverted U-shaped furnace from being blocked according to claim 9, characterized in that, In the channel blockage detection step, during the process from the start of distillation to 120 hours of distillation, if the temperature of the condenser drops below 200℃ and the rate of temperature drop in the condenser is greater than 30℃ / h, a blockage is determined to have occurred.

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