A boiling chlorination furnace crushing and slagging device and an operating method thereof

Abstract

The present application belongs to the field of titanium dioxide production, and particularly relates to a kind of boiling chlorination furnace broken slag discharge device and operating method, the chlorination furnace slag discharge pipe is sequentially connected with disc valve, coarse slag pipe, broken valve, slag pipe, unloading valve, discharge pipe and fluidization elbow below, fluidization elbow is equipped with fluidization air inlet, fluidization elbow discharge end is connected to the residue tank, the upper and lower ends of disc valve and broken valve are equipped with fluidization cooling ring, the side wall of slag discharge pipe, coarse slag pipe and slag pipe is equipped with dredging port, the outside of slag discharge pipe is equipped with air cannon, air cannon is connected with each pipeline dredging port, fluidization air inlet is connected with air supply pipe, each fluidization cooling ring is connected with fluidization gas pipe, the top negative pressure port of residue tank is connected with air extractor, the bottom of residue tank is connected with screw conveyor, temperature sensor and pressure sensor are respectively arranged on the slag discharge pipe and coarse slag pipe, DCS control system is arranged outside the chlorination furnace, can carry out the crushing of the agglomeration and spalling refractory brick of furnace bottom, avoid the blockage of slag discharge pipe, improve the boiling effect.

Description

Technical Field

[0001] The invention belongs to the field of titanium dioxide production, and particularly relates to a boiling chlorination furnace crushing and slag discharge device and an operating method. Background Art

[0002] With the increasing scarcity of titanium ore resources, the titanium ore used in large-scale fluidized bed chlorination furnaces for the production of titanium dioxide by the chloride process now has a high silicon and calcium content and a low grade. High-boiling-point, low-melting-point chlorides (such as MgCl2 and CaCl2) remain in the chlorination furnace bed. When these impurities accumulate to a certain amount, sintering occurs, causing the furnace to deteriorate, caking at the bottom of the chlorination furnace, poor boiling conditions, high entrainment losses, and damage to the furnace's internal refractory layer. Furthermore, the refractory bricks in the furnace continue to flake off during long-term operation and cannot be discharged from the furnace. Long-term accumulation causes secondary damage to the furnace wall bricks under boiling conditions. Currently, traditional slag removal methods have difficulty discharging broken bricks, resulting in frequent slag blockages and the inability to achieve continuous slag removal. This leads to high labor intensity in on-site operations and severe equipment corrosion. Summary of the Invention

[0003] In view of the above situation, the present invention designs a boiling chlorination furnace crushing and slag discharge device and an operating method, which can well realize continuous slag discharge of the boiling chlorination furnace and significantly improve the boiling effect of the chlorination furnace.

[0004] In order to achieve the above objectives, the present invention adopts the following technical solutions:

[0005] A boiling chlorination furnace crushing and slag discharge device comprises a chlorination furnace and a slag discharge pipe at the bottom thereof, wherein the lower portion of the slag discharge pipe is sequentially connected with a disc valve, a coarse slag pipe, a crushing valve, a crushed slag pipe, a discharge valve, a feed pipe and a fluidizing elbow from top to bottom, a fluidizing air inlet is provided on the outer arc surface of the fluidizing elbow, a discharge end of the fluidizing elbow is connected to a slag storage tank, the upper and lower ends of the disc valve and the crushing valve are both provided with a fluidizing cooling ring, a dredging port is respectively provided on the side wall of the slag discharge pipe, the coarse slag pipe and the crushed slag pipe, an air cannon is provided on the outer side of the slag discharge pipe, and an air outlet pipe of the air cannon is respectively connected to the dredging ports of the slag discharge dredging valve, the coarse slag dredging valve and the crushed dredging valve with the slag discharge pipe, the coarse slag pipe and the crushed slag pipe. The ports are connected accordingly, the fluidized air inlet is connected to an air delivery pipe, the air delivery pipe is provided with an air inlet valve, each fluidized cooling ring is correspondingly connected to a fluidized gas pipe, each fluidized gas pipe is correspondingly provided with a fluidized gas valve, a negative pressure port and an explosion relief port are provided on the top of the slag storage tank, the negative pressure port is connected to an exhaust fan that generates negative pressure in the slag storage tank, a fluidized pipe is provided at the bottom of the slag storage tank, and the discharge port at the lower end of the fluidized pipe is connected to a screw conveyor, the slag discharge pipe and the coarse slag pipe are respectively provided with a temperature sensor and a pressure sensor, each valve in the device is an electric valve, a DCS control system is provided outside the chlorination furnace, and each electric valve and sensor are electrically connected to the DCS control system.

[0006] Further, the slag discharge pipe is a stainless steel pipe lined with aluminum-silicon refractory bricks, and the fluidization elbow is made of stainless steel and lined with high-chromium cast iron wear-resistant coating.

[0007] Further, the fluidization cooling ring is made of stainless steel and internally provided with a plurality of inclined hole gas passages, and the air supply pipe is further provided with a thermometer.

[0008] Further, the slag storage tank is lined with refractory castable, and a pressure gauge is mounted on the top of the slag storage tank, the exhaust fan is a variable frequency fan, and the fluidization pipe at the bottom of the slag storage tank can be used as an intermediate slag storage device.

[0009] Further, the temperature sensors and pressure sensors of the slag discharge pipe and the coarse slag pipe detect the temperature and pressure of each section of the pipe in real time, the air flow of each channel is adjusted according to the temperature and pressure feedback of the slag discharge pipe and the coarse slag pipe, and the air cannon and each dredging valve dredge each pipe section according to the pressure difference of each section of the pipe.

[0010] Further, the air supply pipe and each fluidization gas pipe are connected to nitrogen, and flow meters are mounted on the air supply pipe and each fluidization gas pipe, and the air inlet valve and the fluidization gas valve are nitrogen regulating valves.

[0011] Further, the nitrogen purge port is arranged on the valve body of the disc valve for cooling and material purging inside the disc valve cavity.

[0012] Further, the crushing valve is a double-rotor crushing valve, which has a pressure-reducing cone and a center discharge port with mechanical unblocking and blowing flow assisting functions.

[0013] Further, the discharge valve is a star-shaped discharge valve, the end cover of the star-shaped discharge valve adopts a side air inlet gas seal structure, the rotor impeller is drivingly connected to a discharge motor, and the discharge motor is a variable frequency motor.

[0014] The application also provides an operation method for the above-mentioned fluidized bed chlorination furnace crushing and slag discharge device, which comprises the following steps:

[0015] Step 1: checking and setting each control data in the DCS control system, including the temperature and pressure parameters of the slag discharge pipe between the chlorination furnace and the disc valve, and the coarse slag pipe between the disc valve and the crushing valve;

[0016] Step 2: before the chlorination furnace discharges slag, the exhaust fan is started to perform negative pressure extraction on the slag storage tank, and the pressure in the slag storage tank is adjusted to-50 Mbar;

[0017] Step 3: before the chlorination furnace discharges slag, the disc valve is closed, the crushing valve, the discharge valve and the screw conveyor are started, the frequency of the discharge motor is controlled at 25-30 Hz, and the working frequency of the crushing valve is interlocked with the discharge valve to make the discharge valve top continuously store materials;

[0018] Step 4: Prepare the chlorination furnace before slagging. Open and close the disc valve at intervals for slagging. The interval between opening and closing the disc valve is 20 seconds. The temperature of the slagging pipe is controlled at 350-400°C, and the temperature of the coarse slag pipe is controlled at 200-250°C. If the temperature is too high, adjust the fluidized bed cooling nitrogen regulating valve accordingly to reduce the temperature. If the pressure in the slagging pipe and the coarse slag pipe is too high, open the air cannon and the corresponding dredge valve to dredge the pipeline.

[0019] Step 5: Open the nitrogen regulating valve of the fluidized elbow and introduce nitrogen. The flow rate is controlled at 120-150Nm 3 / h; the crushed slag falling from the discharge valve is blown into the slag storage tank, and then discharged into the screw conveyor through the fluidizing pipe at the bottom of the slag storage tank, and finally discharged from the outlet of the screw conveyor. The discharge flow of the screw conveyor is 60Nm 3 / h.

[0020] The present invention also includes other components that enable normal use, which are conventional means in the field. In addition, devices or components not limited in the present invention all adopt existing technologies in the field.

[0021] The beneficial effects of the present invention are as follows:

[0022] The present invention provides a boiling chlorination furnace crushing and slag discharge device and an operating method, which can crush the refractory bricks agglomerated at the bottom of the boiling chlorination furnace and peeled off from the furnace wall, avoid clogging of the chlorination furnace slag discharge pipe, realize continuous and efficient slag discharge of the chlorination furnace, significantly improve the boiling effect of the chlorination furnace, reduce the labor intensity of clearing blockages, and prevent the furnace bottom agglomerated and peeled refractory bricks from causing secondary damage to the furnace wall bricks, thereby extending the service life of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the boiling chlorination furnace crushing and slag discharge device in the embodiment. DETAILED DESCRIPTION

[0024] The technical solutions of the present invention will be clearly and completely described below in conjunction with specific embodiments. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments.

[0025] It should be noted that the directions or positional relationships indicated by the terms "upper", "lower", "inner", "outer", etc. are based on the drawings and are only for the convenience of description.

[0026] Example

[0027] like Figure 1As shown, a kind of broken discharging device of boiling chlorination furnace, including chlorination furnace 1 and its bottom discharging pipe 2, the discharging pipe is connected with disc valve 3, coarse slag pipe, broken valve 5, slag pipe 7, discharge valve 6, lower pipe and fluidization elbow 9 from top to bottom in turn below, fluidization air inlet 10 is provided on the outer camber of fluidization elbow, the discharge end of fluidization elbow is connected to residue tank 11, the upper and lower ends of disc valve and broken valve are provided with fluidization cooling ring 4, the side wall of discharging pipe, coarse slag pipe and slag pipe is respectively provided with dredging port, the outer side of discharging pipe is provided with air cannon, the air outlet pipe 8 of air cannon is connected with the dredging port of discharging pipe, coarse slag pipe and slag pipe through discharging dredging valve, coarse slag dredging valve and broken material dredging valve respectively, fluidization air inlet is connected with air conveying pipe, air conveying pipe is provided with air inlet valve, corresponding fluidization gas pipe is connected on each fluidization cooling ring, corresponding fluidization gas valve is provided on each fluidization gas pipe, the top of residue tank is provided with negative pressure port 11-2 and explosion vent 11-1, negative pressure port is connected to air extractor for generating negative pressure in residue tank, residue tank bottom is provided with fluidization pipe 11-3, the lower end discharge port of fluidization pipe is connected with screw conveyor 12, the temperature sensor and pressure sensor are respectively provided on the discharging pipe and coarse slag pipe, each valve in the device is electric valve, DCS control system is arranged outside chlorination furnace, each electric valve and sensor are electrically connected with DCS control system.

[0028] The discharging pipe is stainless steel pipe, lined with aluminium-silicon refractory ring brick, the fluidization elbow is stainless steel material, lined with high-chromium cast iron wear-resistant coating.

[0029] The fluidization cooling ring adopts stainless steel forge piece, 12 inclined hole gas passages are formed in the inside, air flow is concentrated to the center in spiral shape, comprehensively cools material in pipe, and helps material fluidization, to avoid material blockage;The air conveying pipe is also provided with thermometer.

[0030] The residue tank is lined with refractory castable, pressure gauge is installed on the top of residue tank, the air extractor is variable frequency fan, and the fluidization pipe at the bottom of residue tank can be used as intermediate residue storage equipment.

[0031] The temperature sensor and pressure sensor of the discharging pipe and coarse slag pipe detect the temperature and pressure of each pipe section on line, adjust the gas flow of each path according to the temperature and pressure feedback of the discharging pipe and coarse slag pipe, to ensure that discharging is carried out under safe temperature and pressure, and the air cannon and each dredging valve can break arch and dredge according to the pressure difference of each pipe section.

[0032] Nitrogen is introduced into the air conveying pipe and each fluidization gas pipe, and flow meter is installed on the air conveying pipe and each fluidization gas pipe, the air inlet valve and fluidization gas valve are nitrogen regulating valves.

[0033] Nitrogen blowing port is arranged on the valve body of disc valve, to cool the inside of disc valve cavity and blow material.

[0034] The crushing valve is a double-rotor crushing valve made of high-temperature stainless steel. The end covers on both sides are sealed with nitrogen, the shaft seal is made of high-temperature and high-pressure graphite filler, and the double rotors are made of high-temperature wear-resistant steel. It has mechanical clearing and flow-aiding functions inside the pressure reducing cone and the center discharge port, that is, it has the functions of lifting, impact rotation and 360° no-dead-angle blowing. The particle size of the crushed material is less than 1cm.

[0035] The discharge valve is a star-shaped discharge valve, the end cover of which adopts a side air intake air seal structure, the rotor impeller is connected to the discharge motor, and the discharge motor adopts a variable frequency motor to control the discharge flow rate, seal the gas in the material pipeline, and discharge the material evenly; the discharge valve adopts an end face air seal.

[0036] The operating method of the boiling chlorination furnace crushing and slag discharge device comprises the following steps:

[0037] Step 1: Check and set various control data in the DCS control system, including the temperature and pressure parameters of the slag discharge pipe between the chlorination furnace and the disc valve, and the coarse slag pipe between the disc valve and the crushing valve;

[0038] Step 2: Before discharging the chlorination furnace, turn on the exhaust fan to pump negative pressure into the slag storage tank and adjust the pressure inside the slag storage tank to -50Mbar;

[0039] Step 3: Before discharging the chlorination furnace, the disc valve is closed, and the crushing valve, discharge valve and screw conveyor are opened. The frequency of the discharge motor is controlled at 25-30Hz, and the operating frequency of the crushing valve is interlocked with the discharge valve to ensure that the material is continuously stored at the top of the discharge valve;

[0040] Step 4: Prepare the chlorination furnace before slagging. Open and close the disc valve at intervals for slagging. The interval between opening and closing the disc valve is 20 seconds. The temperature of the slagging pipe is controlled at 350-400°C, and the temperature of the coarse slag pipe is controlled at 200-250°C. If the temperature is too high, adjust the fluidized bed cooling nitrogen regulating valve accordingly to reduce the temperature. If the pressure in the slagging pipe and the coarse slag pipe is too high, open the air cannon and the corresponding dredge valve to dredge the pipeline.

[0041] Step 5: Open the nitrogen regulating valve of the fluidized elbow and introduce nitrogen. The flow rate is controlled at 120-150Nm 3 / h; the crushed slag falling from the discharge valve is blown into the slag storage tank, and then discharged into the screw conveyor through the fluidizing pipe at the bottom of the slag storage tank, and finally discharged from the outlet of the screw conveyor. The discharge flow of the screw conveyor is 60Nm 3 / h.

[0042] The operating method of the boiling chlorination furnace crushing and slag discharge device can adjust individual operating steps, process parameters and control indicators accordingly according to different chlorination furnace slag discharge requirements.

[0043] The technical solution of the present invention is not limited to the above-mentioned specific embodiments. Without departing from the scope and spirit of the described embodiments, many modifications and changes are obvious to ordinary technicians in this technical field. Any technical deformation made within the spirit and principles of the present invention falls within the scope of protection of the present invention.

Claims

1. A slag crushing and discharging device for a boiling chlorination furnace, comprising a chlorination furnace and a slag discharging pipe at its bottom, characterized in that: The bottom of the slag discharge pipe is connected to a disc valve, a coarse slag pipe, a crushing valve, a crushing slag pipe, a discharge valve, a discharge pipe and a fluidizing elbow in sequence from top to bottom; A fluidizing air inlet is provided on the outer arc surface of the fluidizing elbow, the discharge end of the fluidizing elbow is connected to the slag storage tank, and fluidizing cooling rings are provided on the upper and lower ends of the disc valve and the crushing valve; a nitrogen purge port is provided on the valve body of the disc valve; The fluidized cooling ring is made of stainless steel forgings, with multiple oblique gas channels opened inside, and the air flow is concentrated in a spiral shape toward the center; The discharge valve is a star-shaped discharge valve, the end cover of which adopts a side air inlet gas seal structure, and the rotor impeller is connected to the discharge motor, which adopts a variable frequency motor; The side walls of the slag discharge pipe, coarse slag pipe and crushed slag pipe are each provided with a dredging port, and an air cannon is provided on the outside of the slag discharge pipe. The air outlet pipe of the air cannon is connected to the dredging ports of the slag discharge pipe, coarse slag pipe and crushed slag pipe through the slag discharge dredging valve, coarse slag dredging valve and crushed material dredging valve respectively; The fluidization air inlet is connected to an air delivery pipe, which is provided with an air inlet valve. Each fluidization cooling ring is correspondingly connected to a fluidization gas pipe, and each fluidization gas pipe is correspondingly provided with a fluidization gas valve. A negative pressure port and an explosion vent are provided on the top of the slag storage tank. The negative pressure port is connected to an exhaust fan that generates negative pressure in the slag storage tank. A fluidization pipe is provided at the bottom of the slag storage tank, and the discharge port at the lower end of the fluidization pipe is connected to a screw conveyor. Nitrogen is introduced into the air delivery pipe and each fluidization gas pipe, and the air inlet valve and the fluidization gas valve are both nitrogen regulating valves. The slag discharge pipe and the coarse slag pipe are respectively provided with a temperature sensor and a pressure sensor. All valves in the device are electric valves. A DCS control system is provided outside the chlorination furnace. All electric valves and sensors are electrically connected to the DCS control system.

2. A boiling chlorination furnace crushing and slag removal device according to claim 1, characterized in that: The slag discharge pipe is a stainless steel pipe lined with aluminum silicon refractory ring bricks.

3. A boiling chlorination furnace crushing and slag removal device according to claim 1, characterized in that: The fluidizing elbow is made of stainless steel and lined with a high-chromium cast iron wear-resistant coating.

4. A boiling chlorination furnace crushing and slag removal device according to claim 1, characterized in that: The slag storage tank is lined with refractory castables, a pressure gauge is installed on the top of the slag storage tank, and the exhaust fan is a variable frequency fan.

5. A boiling chlorination furnace crushing and slag removal device according to claim 1, characterized in that: Flow meters are installed on the air delivery pipe and each fluidizing gas pipe.

6. An operating method of the boiling chlorination furnace crushing and slag discharge device according to any one of claims 1 to 5, characterized in that: The following steps are involved: Step 1: Check and set various control data in the DCS control system, including the temperature and pressure parameters of the slag discharge pipe between the chlorination furnace and the disc valve, and the coarse slag pipe between the disc valve and the crushing valve; Step 2: Before discharging the chlorination furnace, turn on the exhaust fan to pump negative pressure into the slag storage tank, and adjust the pressure in the slag storage tank to -50mbar; Step 3: Before discharging the chlorination furnace, the disc valve is closed, and the crushing valve, discharge valve and screw conveyor are opened. The operating frequency of the crushing valve is interlocked with the discharge valve, and the frequency of the discharge motor is controlled at 25-30Hz to ensure that the material is continuously stored at the top of the discharge valve; Step 4: Prepare the chlorination furnace before slagging. Open and close the disc valve at intervals for slagging. The interval between opening and closing the disc valve is 20 seconds. The temperature of the slagging pipe is controlled at 350-400°C, and the temperature of the coarse slag pipe is controlled at 200-250°C. If the temperature is too high, adjust the fluidized bed cooling nitrogen regulating valve accordingly to reduce the temperature. If the pressure in the slagging pipe and the coarse slag pipe is too high, open the air cannon and the corresponding dredge valve to dredge the pipeline. Step 5. Open the nitrogen regulating valve of the fluidized bed elbow and introduce nitrogen with a flow rate controlled at 120-150 Nm³ / h. Blow the crushed slag falling from the discharge valve into the slag storage tank, and then discharge it into the screw conveyor through the fluidized bed pipe at the bottom of the slag storage tank, and finally discharge it from the outlet of the screw conveyor.

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