Boiling chlorination furnace top chlorine pipeline and blockage control device and control method

Abstract

The invention discloses a boiling chlorination furnace top chlorine introducing pipeline and blockage control device and method. The control device comprises a furnace body top, a four-way joint, a quenching pipe, a cyclone separator, a chlorine introducing device and a nitrogen introducing device, wherein the four-way joint, the quenching pipe and the cyclone separator are sequentially connected with the furnace body top; the chlorine introducing device is connected with the furnace body top and the four-way joint; the system further comprises a furnace top pressure transmitter connected with the top of the furnace body and a quenching pressure transmitter connected with the quenching pipe. The control method mainly comprises the following steps: starting a chlorine introduction regulating valve to introduce chlorine into a furnace top and a four-way joint thereof, introducing nitrogen into a chlorine introduction pipeline to purge and take away residual deposits accumulated in the chlorine introduction pipeline in order to enable the pipeline to be smooth, so that a quenching pipe is in a smooth state, and continuous and stable operation of chlorination production is realized. The device has the beneficial effects that the device is scientific in design, easy to implement and convenient to popularize and apply, the overhaul period of the quenching pipe can be greatly prolonged, the effective utilization rate of raw materials is remarkably increased, and therefore the output of titanium tetrachloride is increased.

Description

Technical Field

[0001] The present application relates to the technical field of producing titanium tetrachloride by boiling chlorination method, and in particular to a chlorine pipeline and furnace top blockage control technology for producing titanium tetrachloride by boiling chlorination method. Background Art

[0002] The basic principle of the boiling chlorination furnace is to use chlorine to react with raw materials at high temperature to generate soluble chlorides, thereby realizing the extraction of valuable metals. In this process, the raw material particles are in a boiling state in the furnace, and fully contact and react with chlorine, thereby generating a large amount of dust-containing gas. These dust-containing gases mainly contain fine solid particles, such as unreacted raw materials, reaction products, and impurities in the charge. These dust particles are not only small in particle size, but also have high temperature and certain viscosity. When accumulated to a certain amount, it will seriously affect the boiling state of the chlorination boiling bed, and then affect the smooth progress of boiling chlorination production and even cause shutdown. Therefore, it must be fully reacted regularly to ensure that the boiling bed in the boiling chlorination furnace is in a good boiling state and the four-way quenching pipe is in an unobstructed state, so that the chlorination production can run continuously and stably.

[0003] The reaction temperature of the boiling chlorination furnace is usually between 900 and 1050°C. Since Fe ions also participate in the reaction during the production process, the furnace gas will inevitably carry away FeCL2 during the rising process. The introduction of chlorine can make FeCL2 fully react to generate FeCL3, and the solid particles will be collected by the cyclone dust collector. Similarly, nitrogen is introduced into the chlorine pipeline, and the accumulated residual deposits in the chlorine pipeline can be taken away through the nitrogen pipeline pressure. Summary of the invention

[0004] The present application is designed to solve the above-mentioned technical problems and discloses a device and method for controlling the chlorine pipeline and blockage of the top of a boiling chlorination furnace.

[0005] The technical solution adopted by this application to solve its technical problem is: A chlorine-passing pipeline and blockage control device for the top of a boiling chlorination furnace. The control device comprises a furnace body top, a four-way pipe connected to the furnace body top in sequence, a quenching pipe and a cyclone separator, a chlorine-passing device connected to the furnace body top and the four-way pipe, and a nitrogen-passing device connected to the chlorine-passing device; the system also comprises a furnace top pressure transmitter connected to the furnace body top, and a quenching pressure transmitter connected to the quenching pipe.

[0006] The chlorine supply pipeline and blockage control device of the boiling chlorination furnace top, the chlorine supply device comprises: a chlorine supply pipeline 1#, and a chlorine supply flow meter 1#, a chlorine supply regulating valve 1# and a chlorine supply pipeline pressure transmitter 1# connected thereto; Chlorine supply pipeline 2#, and chlorine supply flow meter 2#, chlorine supply regulating valve 2# and chlorine supply pipeline pressure transmitter 2# connected thereto; Chlorine pipeline 3#, and chlorine flowmeter 3#, chlorine regulating valve 3# and chlorine pipeline pressure transmitter 3# connected thereto.

[0007] The boiling chlorination furnace top chlorine pipeline and blockage control device, the nitrogen supply device includes: nitrogen supply pipeline 1#, and nitrogen supply flowmeter 1# and nitrogen supply regulating valve 1# connected thereto; Nitrogen supply pipeline 2#, and nitrogen supply flow meter 2# and nitrogen supply regulating valve 2# connected thereto; Nitrogen supply pipeline 3#, and nitrogen supply flowmeter 3# and nitrogen supply regulating valve 3# connected thereto.

[0008] The chlorine pipeline and blockage control device on the top of the boiling chlorination furnace, the four-way pipe and the quenching pipe shell are made of carbon steel, and the internal refractory brick layer is made of high-aluminum refractory brick, which has a high melting point and thermal stability, can maintain its shape and mechanical properties in a high temperature environment, and will not age or split under the impact of gas slag.

[0009] The chlorine pipeline and blockage control device on the top of the boiling chlorination furnace, and the chlorine flowmeter 1#, 2#, 3# contact liquid materials are made of HC 276 material; HC276 alloy has high resistance to various corrosive media, especially in environments containing chlorides. It can resist wet chlorine, various oxidizing chlorides, chloride salt solutions, sulfuric acid and oxidizing salts, and has good corrosion resistance in low-temperature and medium-temperature hydrochloric acid.

[0010] The chlorine control valves 1#, 2# and 3# are pneumatic control valves with integral forged valve bodies and PTFE lining. The integral forged valve bodies have no welded seams, thus eliminating potential leakage points. A layer of fluorine lining is added to enhance the firmness and sealing performance of the valve body, greatly reducing the amount of chlorine leakage on site.

[0011] The chlorine pipeline and blockage control device on the top of the boiling chlorination furnace, and the nitrogen flow meters 1#, 2#, and 3# are made of 316L material for contacting liquid; The nitrogen regulating valves 1#, 2# and 3# are pneumatic regulating valves, the shells of which are made of CF8 material, and the valve internals are made of 316L material.

[0012] The control method of the device includes the following operations: S1: When the boiling chlorination furnace starts production, observe the furnace top pressure transmitter and the quench pipe pressure transmitter (0). When the pressure gradually increases, open the chlorine control valves 1#, 2#, and 3# on the chlorine pipelines 1#, 2#, and 3# to control the flow rate at 50kg / h; when the pressure indication is 30%, start the chlorine control valve 1#; when the pressure indication is 60%, start the chlorine control valves 1# and 2#; when the pressure indication is 100%, start the chlorine control valves 1#, 2#, and 3#. When chlorine is introduced, the suspended TiO2, FeCL2, and solid particles in the pipeline react with the chlorine for the second time. The reaction formula is: a: CL2+Tio2+C=TiCL4+CO2+CO; b: CL2+FeCL2=FeCL3. The generated TiCL4 gas enters the condensation system, and the FeCL3 and other slag dust enter the dust collection system. S2: When chlorine starts to be introduced into the chlorine pipeline, nitrogen with a pressure of 0.4MPa / 30Nm³-50Nm³ is introduced into the chlorine pipelines 1#, 2#, and 3#; the chlorine contains 15% impurities, the main components of which are: MgCL2, CaCL2, gas deposits, Ar, and H2O. Long-term operation will cause pipeline blockage; S3: Set the furnace top pressure transmitter and quenching pressure transmitter to start DCS interlocking with chlorine control valves 1#, 2#, and 3# on chlorine pipelines 1#, 2#, and 3#; the pressure is designed with 2 pressure levels. When the pressure exceeds the first or second level setting value, the chlorine control valves 1#, 2#, and 3# are opened and the valve opening increases from 25% to 50% and then to 75% until the valve opening reaches 90%; S4: Chlorine pipeline pressure transmitters 1#, 2#, 3# and nitrogen regulating valves 1#, 2#, 3# (DCS interlocking start, when the pressure is greater than 0, nitrogen regulating valves 1#, 2#, 3# are started at the same time.

[0013] The control method of the device is to clean the crystals existing in the furnace top, the four-way, the quench pipe and the inside of the cyclone separator device and the pipeline every six months.

[0014] At least one of the above-mentioned technical solutions adopted in the embodiments of the present application can achieve the following beneficial effects: the chlorine pipeline and blockage control device on the top of the boiling chlorination furnace are scientifically designed, simple to implement, and easy to promote and apply, and can greatly extend the maintenance cycle of the quenching pipe, significantly improve the effective utilization rate of raw materials, thereby increasing the output of titanium tetrachloride. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings: Figure 1It is a schematic diagram of the equipment flow of the present invention.

[0016] In the figure: furnace body (101), four-way (102), quench pipe (103), cyclone separator (110), chlorine pipelines 1#, 2#, 3# (104, 105, 106), nitrogen pipelines 1#, 2#, 3# (107, 108, 109), furnace top pressure transmitter (1), quench pipe pressure transmitter (0), chlorine pipeline pressure transmitters 1#, 2#, 3# (2, 3, 4), chlorine flow meters 1#, 2#, 3# are (5, 6, 7), chlorine regulating valves 1#, 2#, 3# are (11, 12, 13), nitrogen flow meters 1#, 2#, 3# are (8, 9, 10), and nitrogen regulating valves 1#, 2#, 3# are (14, 15, 16). DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solution and advantages of the present application clearer, the technical solution of the present application will be clearly and completely described below in combination with the specific embodiments of the present application and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application.

[0018] The technical solutions provided by various embodiments of the present application are described in detail below in conjunction with the accompanying drawings.

[0019] In the present invention, the descriptions of "1#, 2#, 3#", "elevated", "on", etc. are only used for descriptive purposes and cannot be understood as indicating or implying the number of technical features. Therefore, the features of "1#, 2#, 3#", "elevated", "on" may explicitly or metaphorically include at least one of the features. In addition, the various technical solutions may be combined with each other. In the present invention, "connected" is not limited to flange connection, but also direct welding connection. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0020] In order to facilitate the understanding of the various embodiments of the present application, Figure 1 The present invention discloses a chlorine pipeline and blockage control device for the top of a boiling chlorination furnace. The control device comprises a furnace top 101, a four-way valve 102 connected to the furnace top 101 in sequence, a quenching pipe 103 and a cyclone separator 110, a chlorine supply device connected to the furnace top 101 and the four-way valve 102, and a nitrogen supply device connected to the chlorine supply device; the device also comprises a furnace top pressure transmitter 1 connected to the furnace top 101, and a quenching pressure transmitter 0 connected to the quenching pipe 103.

[0021] The chlorine supply pipeline and blockage control device of the boiling chlorination furnace top, the chlorine supply device comprises: a chlorine supply pipeline 1#104, and a chlorine supply flow meter 1#5, a chlorine supply regulating valve 1#11 and a chlorine supply pipeline pressure transmitter 1#2 connected thereto; Chlorine supply pipeline 2#105, and the chlorine supply flow meter 2#6, chlorine supply regulating valve 2#12 and chlorine supply pipeline pressure transmitter 2#3 connected thereto; Chlorine supply pipeline 3#106, and the chlorine supply flow meter 3#7, chlorine supply regulating valve 3#13 and chlorine supply pipeline pressure transmitter 3#4 connected thereto.

[0022] The boiling chlorination furnace top chlorine pipeline and blockage control device, the nitrogen supply device includes: nitrogen supply pipeline 1#107, and nitrogen supply flowmeter 1#8 and nitrogen supply regulating valve 1#14 connected thereto; A nitrogen supply pipeline 2#108, and a nitrogen supply flow meter 2#9 and a nitrogen supply regulating valve 2#15 connected thereto; Nitrogen supply pipeline 3#109, and the nitrogen supply flowmeter 3#10 and nitrogen supply regulating valve 3#16 connected thereto.

[0023] The chlorine pipeline and blockage control device on the top of the boiling chlorination furnace, the shell of the four-way 102 and the quenching pipe 103 are made of carbon steel, and the interior is made of refractory bricks. The refractory bricks are high-aluminum refractory bricks, which have a high melting point and thermal stability, can maintain their shape and mechanical properties in a high temperature environment, and will not age or split under the impact of gas slag.

[0024] The chlorine pipeline and blockage control device on the top of the boiling chlorination furnace, and the liquid contact materials of the chlorine flowmeters 1#, 2#, 3#5, 6, and 7 are made of HC 276 material; HC276 alloy has high resistance to various corrosive media, especially in environments containing chlorides. It can resist wet chlorine, various oxidizing chlorides, chloride salt solutions, sulfuric acid and oxidizing salts, and has good corrosion resistance in low-temperature and medium-temperature hydrochloric acid.

[0025] The chlorine control valves 1#, 2#, 3#11, 12, 13 are pneumatic control valves with integral forged valve bodies and PTFE lining. The integral forged valve bodies have no welded seams, thus eliminating potential leakage points. A layer of fluorine lining is added to enhance the firmness and sealing performance of the valve body, thereby greatly reducing the amount of chlorine leakage on site.

[0026] The chlorine pipeline and blockage control device on the top of the boiling chlorination furnace, the nitrogen flow meters 1#, 2#, 3# are made of 316L material for 8, 9, 10 liquid contacts; The nitrogen regulating valves 1#, 2#, 3#14, 15, 16 are pneumatic regulating valves, the shells are made of CF8 material, and the valve internals are made of 316L material.

[0027] The control method of the device comprises the following operations: S1: When the boiling chlorination furnace starts production, observe the furnace top pressure transmitter 1 and the quench pipe pressure transmitter 0. When the pressure gradually increases, open the chlorine regulating valves 1#, 2#, 3#11, 12, 13 on the chlorine pipelines 1#, 2#, 3#104, 105, 106 to control the flow rate at 50kg / h; when the pressure indication is 30%, start the chlorine regulating valve 1#, when the pressure indication is 60%, start the chlorine regulating valves 1# and 2#, and when the pressure indication is 100%, start the chlorine regulating valves 1#, 2#, and 3#. When chlorine is introduced, the suspended TiO2, FeCL2, and solid particles in the pipeline react with the chlorine for the second time. The reaction formula is: a: CL2+Tio2+C=TiCL4+CO2+CO; b: CL2+FeCL2=FeCL3, the generated TiCL4 gas enters the condensation system, and the FeCL3 and other slag dust enter the dust collection system; S2: When chlorine starts to be introduced into the chlorine pipeline, nitrogen with a pressure of 0.4MPa / 30Nm³-50Nm³ is introduced into the chlorine pipelines 1#, 2#, 3#104, 105, and 106; the chlorine contains 15% impurities, the main components of which are: MgCL2, CaCL2, gas deposits, Ar, and H2O. Long-term operation will cause pipeline blockage; S3: Set the furnace top pressure transmitter 1 and the quenching pressure transmitter 0 to perform DCS interlocking start with the chlorine regulating valves 1#, 2#, 3#11, 12, 13 on the chlorine pipelines 1#, 2#, 3#104, 105, 106; the pressure is designed with 2 pressure levels. When the pressure exceeds the first or second level set value, the chlorine regulating valves 1#, 2#, 3#11, 12, 13 are opened and the valve opening increases from 25% to 50% and then to 75% until the valve opening reaches 90%; S4: The chlorine pipeline pressure transmitters 1#, 2#, 3#2, 3, 4 and nitrogen regulating valves 1#, 2#, 3#14, 15, 16 are started by DCS interlocking. When the pressure is greater than 0, the nitrogen regulating valves 1#, 2#, 3#14, 15, 16 are started simultaneously.

[0028] The control method of the device is to clean the crystals existing in the furnace top 101, the four-way 102, the quenching pipe 103 and the cyclone separator 110 device and the pipeline every six months.

[0029] Working principle: In actual boiling chlorination production, high titanium slag contains iron in the carbon chlorination reaction. Under high temperature and chlorine conditions, iron will be chlorinated to form FeCL2 or FeCL3. These iron chlorides may exist in gaseous solid form, while other gaseous products TIO2 and C enter the chlorination furnace outlet through the four-way and quench pipe into the cyclone separator and finally enter the dust collection system. However, since the boiling point of FeCL2 gaseous solid form is higher and the boiling point of FeCL3 is lower, chlorine is added again to the furnace top and the four-way to make FeCL2 fully react to become FeCl3 reaction formula: CL2+ TIO2+C=TiCL4+CO2+CO; CL2+ FeCL2=FeCL3, TiCL4 gas enters the condensation system, and FeCL3 slag dust enters the dust collection system. It greatly extends the maintenance cycle of the quench pipe, significantly improves the effective utilization rate of raw materials, and thus increases the output of titanium tetrachloride.

[0030] All the above-mentioned instruments, valves, monitoring and measuring devices are controlled by DCS interlocking start, and the conditions and control interlocking are completed, realizing automatic control and avoiding human operation errors. DCS interlocking start refers to the start and stop of equipment through interlocking logic control in the distributed control system (DCS). The DCS system realizes automatic control of equipment through preset logic control programs to ensure the normal operation of the system. Specifically, when a device fails or needs to stop running, the backup device will automatically start to keep the system running continuously.

[0031] The above description is only an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present application shall be included in the scope of the claims of the present application.

Claims

1. A chlorine pipeline and blockage control device for the top of a boiling chlorination furnace, characterized in that: The control device comprises a furnace top (101), a four-way valve (102) connected to the furnace top (101) in sequence, a quenching pipe (103) and a cyclone separator (110), a chlorine supply device connected to the furnace top (101) and the four-way valve (102), and a nitrogen supply device connected to the chlorine supply device; the device also comprises a furnace top pressure transmitter (1) connected to the furnace top (101), and a quenching pressure transmitter (0) connected to the quenching pipe (103).

2. The chlorine-passing pipeline and blockage control device for the top of a boiling chlorination furnace according to claim 1, characterized in that: The chlorine supply device comprises: a chlorine supply pipeline 1# (104), and a chlorine supply flow meter 1# (5), a chlorine supply regulating valve 1# (11) and a chlorine supply pipeline pressure transmitter 1# (2) connected thereto; a chlorine supply pipeline 2# (105), and a chlorine supply flow meter 2# (6), a chlorine supply regulating valve 2# (12) and a chlorine supply pipeline pressure transmitter 2# (3) connected thereto; and a chlorine supply pipeline 3# (106), and a chlorine supply flow meter 3# (7), a chlorine supply regulating valve 3# (13) and a chlorine supply pipeline pressure transmitter 3# (4) connected thereto.

3. The chlorine-passing pipeline and blockage control device for the top of a boiling chlorination furnace according to claim 1, characterized in that: The nitrogen supply device comprises: a nitrogen supply pipeline 1# (107), and a nitrogen supply flow meter 1# (8) and a nitrogen supply regulating valve 1# (14) connected thereto; A nitrogen supply pipeline 2# (108), and a nitrogen supply flow meter 2# (9) and a nitrogen supply regulating valve 2# (15) connected thereto; A nitrogen supply pipeline 3# (109), and a nitrogen supply flow meter 3# (10) and a nitrogen supply regulating valve 3# (16) connected thereto.

4. The chlorine-passing pipeline and blockage control device for the top of a boiling chlorination furnace according to claim 1, characterized in that: The outer shells of the cross-connect (102) and the quenching tube (103) are made of carbon steel, and the inner layers are made of refractory bricks.

5. The boiling chlorination furnace top chlorine pipeline and blockage control device according to claim 2, characterized in that: The liquid contact material of the chlorine flow meter 1#, 2#, 3# (5, 6, 7) is made of HC 276 material; The chlorine control valves 1#, 2#, 3# (11, 12, 13) are pneumatic control valves with integral forged valve bodies and an inner lining of PTFE material.

6. The chlorine-passing pipeline and blockage control device for the top of a boiling chlorination furnace according to claim 3, characterized in that: The nitrogen flow meters 1#, 2#, 3# (8, 9, 10) are made of 316L material; the nitrogen control valves 1#, 2#, 3# (14, 15, 16) are pneumatic control valves, the shells are made of CF8 material, and the valve internals are made of 316L material.

7. The control method of the device according to any one of claims 1 to 6, characterized in that: The method comprises the following operations: S1: When the boiling chlorination furnace starts production, observe the furnace top pressure transmitter (1) and the quench pipe pressure transmitter (0). When the pressure gradually increases, open the chlorine control valves 1#, 2#, 3# (11, 12, 13) on the chlorine pipes 1#, 2#, 3# (104, 105, 106) to control the flow rate at 50kg / h; start the chlorine control valve 1# when the pressure indication is 30%, start the chlorine control valve 1# when the pressure indication is 60%, start the chlorine control valves 1#, 2#, and 3# when the pressure indication is 100%; when chlorine is introduced, the TiO2, FeCL2, and solid particles suspended in the pipeline react with the chlorine gas for a second time, and the reaction formula is: a: CL2+Tio2+C=TiCL4+CO2+CO; b: CL2+FeCL2=FeCL3, the generated TiCL4 gas enters the condensation system, and the FeCL3 and other slag dust enter the dust collection system; S2: When chlorine starts to be introduced into the chlorine pipeline, nitrogen with a pressure of 0.4MPa / 30Nm³-50Nm³ is introduced into the chlorine pipelines 1#, 2#, and 3# (104, 105, and 106); the chlorine contains 15% impurities, the main components of which are: MgCL2, CaCL2, gas deposits, Ar, and H2O. Long-term operation will cause pipeline blockage; S3: Set the furnace top pressure transmitter (1) and the quench pressure transmitter (0) to perform DCS interlocking start with the chlorine control valves 1#, 2#, 3# (11, 12, 13) on the chlorine pipes 1#, 2#, 3# (104, 105, 106); the pressure is designed to have two pressure levels. When the pressure exceeds the first or second level set value, the chlorine control valves 1#, 2#, 3# (11, 12, 13) are opened and the valve opening increases from 25% to 50% and then to 75% until the valve opening is 100%; S4: The chlorine pipeline pressure transmitters 1#, 2#, 3# (2, 3, 4) and nitrogen regulating valves 1#, 2#, 3# (14, 15, 16) are started by DCS interlocking. When the pressure is greater than 0, the nitrogen regulating valves 1#, 2#, 3# (14, 15, 16) are started at the same time, thereby ensuring that the chlorine pipeline is always in a smooth state and extending the maintenance period of the quench pipe.

8. The control method of the device according to claim 7, characterized in that: Crystals existing in the furnace top (101), the cross-way (102), the quenching pipe (103) and the inside of the cyclone separator (110) and the pipelines must be cleaned every six months.

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