A cement kiln flue gas bypass dechlorination system

Abstract

The present invention relates to the technical field of cement production equipment, and in particular to a cement kiln flue gas bypass dechlorination system, comprising a water storage tank, a refrigerant storage tank, a heat exchanger, a dust removal module and an induced draft fan, wherein the water storage tank is used to store clean water, the refrigerant storage tank is used to store water-soluble salt particles, and a discharge control valve is arranged at the lower end, the heat exchanger comprises a cooling shell, the inner cavity of the cooling shell is divided into a ventilation cavity and a coolant flow cavity by a heat-conducting partition, the feed end of the coolant flow cavity is connected to the water storage tank and the discharge control valve at the same time, and the discharge end of the coolant flow cavity is higher than the feed end of the coolant flow cavity, the dust removal module is connected to the exhaust port of the heat exchanger, the dust removal module can filter particles in the flue gas discharged by the heat exchanger, the air inlet end of the induced draft fan is connected to the exhaust port of the dust removal module, and the clean water in the water storage tank and the water-soluble salt particles in the refrigerant storage tank can be discharged into the coolant flow cavity under the action of gravity. The present invention can reduce the chloride ion content of the cement kiln system.

Description

Technical Field

[0001] The invention relates to the technical field of cement production equipment, and in particular to a cement kiln flue gas bypass dechlorination system. Background Art

[0002] In the cement production process, due to the high alkali (R2O) and chlorine content of the raw materials (limestone, sandstone, etc.), as can be seen from the mass quantity of limestone from 2019 to 2023, the average alkali content of limestone is 0.76% (maximum value 0.85%), and the average chlorine content is 0.026% (maximum value 0.090%), resulting in a high chlorine content in the output cement (close to 0.06%), which poses a high quality risk. At the same time, due to the high levels of harmful elements such as chlorine, alkali, and sulfur, the decomposition furnace, smoke chamber, five-stage cyclone, and discharge pipe are severely crusted. In the existing technology, most of them use staggered kiln stoppages to organize personnel to clean up the crust, which poses a safety risk. Summary of the invention

[0003] Aiming at the technical problem of high chlorine content generated by cement production system; the present invention provides a cement kiln flue gas bypass dechlorination system, which can extract the flue gas from the kiln tail smoke chamber (decomposition furnace) and rapidly cool it, so that the gaseous chloride ions in the flue gas form chlorine crystals after cooling and adsorb on dust particles (hot raw materials), and then filter through the dust filter component, thereby destroying the original chloride ion enrichment cycle, reducing the chloride ion content of the cement kiln system, thereby improving the cement output quality and reducing the frequency of crust cleaning.

[0004] The present invention is achieved through the following technical solutions:

[0005] The present invention provides a cement kiln flue gas bypass dechlorination system, comprising: a water storage tank, the water storage tank is used to store clean water; a refrigerant storage tank, the refrigerant storage tank is used to store water-soluble salt particles, and a discharge control valve is arranged at the lower end of the refrigerant storage tank, the discharge control valve can control the discharge speed of the refrigerant storage tank; a heat exchanger, the heat exchanger comprises a cooling shell, the inner cavity of the cooling shell is divided into a ventilation cavity and a coolant flow cavity by a heat-conducting insulator, the air inlet end of the ventilation cavity is connected to the kiln tail smoke chamber of the decomposition furnace in a working state, and the coolant flow cavity is connected to the kiln tail smoke chamber of the decomposition furnace in a working state. The feed end of the flow cavity is simultaneously connected to the drain port of the water storage tank and the discharge port of the discharge control valve, and the discharge end of the coolant flow cavity is higher than the feed end of the coolant flow cavity; a dust removal module, the dust removal module is connected to the exhaust port of the heat exchanger, and the dust removal module can filter particles in the smoke discharged by the heat exchanger; an induced draft fan, the air inlet end of the induced draft fan is connected to the exhaust port of the dust removal module; wherein the clean water in the water storage tank and the water-soluble salt particles in the refrigerant storage tank can be discharged into the coolant flow cavity under the action of gravity.

[0006] The cement kiln flue gas bypass dechlorination system provided by the present invention comprises a water storage tank, a refrigerant storage tank, a heat exchanger, a dust removal module and an induced draft fan, wherein the water storage tank is used to store clean water, the refrigerant storage tank is used to store water-soluble salt particles, and a discharge control valve is arranged at the lower end of the refrigerant storage tank, and the discharge control valve can control the discharge speed of the refrigerant storage tank, the heat exchanger comprises a cooling shell, the inner cavity of the cooling shell is divided into a ventilation cavity and a coolant flow cavity by a heat-conducting insulator, and the air inlet end of the ventilation cavity is connected to the decomposition furnace in the working state. The kiln tail smoke chamber is connected, the feed end of the coolant flow chamber is connected to the drain port of the water storage tank and the discharge port of the discharge control valve at the same time, and the discharge end of the coolant flow chamber is higher than the feed end of the coolant flow chamber, the dust removal module is connected to the exhaust port of the heat exchanger, the dust removal module can filter the particles in the smoke discharged by the heat exchanger, the air inlet end of the induced draft fan is connected to the exhaust port of the dust removal module, and the clean water in the water storage tank and the water-soluble salt particles in the refrigerant storage tank can be discharged into the coolant flow chamber under the action of gravity.

[0007] When in use, clean water at room temperature is stored in a water storage tank, water-soluble salt particles are stored in a refrigerant storage tank, the air inlet end of the ventilation cavity of the heat exchanger is connected to the kiln tail smoke chamber of the decomposition furnace, and the exhaust end of the induced draft fan is connected to the air inlet end of the denitration system. Then, the drain valve of the water storage tank, the discharge control valve of the refrigerant storage tank and the induced draft fan are opened, so that the clean water at room temperature and the water-soluble salt particles enter the coolant flow cavity under the action of their own gravity, and at the same time, the flue gas in the kiln tail smoke chamber of the decomposition furnace is introduced into the ventilation cavity of the heat exchanger. When the water-soluble salt particles merge with the clean water at room temperature, the water-soluble salt particles undergo a dissolution reaction and quickly absorb a large amount of heat. The ventilation cavity and the coolant flow cavity are separated by a heat-conducting insulator, so that the water-soluble salt particles quickly absorb the heat in the flue gas during the dissolution reaction, thereby forcing the flue gas temperature to drop sharply. At this time, the volatile components in the flue gas quickly condense into chlorine crystals and adhere to the surface of the flue gas particles to separate the chloride ions from the flue gas, thereby destroying the original cycle of chloride ion enrichment and reducing the chloride ion content of the cement kiln system. The cooled flue gas is filtered by the dust removal module under the action of the induced draft fan and discharged into the denitrification system for further treatment, while the flue gas particles containing chloride ions are collected by the dust removal module for further treatment.

[0008] The discharge end of the coolant flow chamber is higher than the feed end of the coolant flow chamber, so that the water-soluble salt aqueous solution is discharged from the coolant flow chamber after filling the coolant flow chamber. On the one hand, the water-soluble salt particles can be fully dissolved to avoid the waste of water-soluble salt particles. On the other hand, the water-soluble salt aqueous solution can fully exchange heat with the flue gas. The salt solution discharged from the coolant flow chamber is stored in a storage container for heat preservation, which is convenient for the subsequent recovery and treatment of the water-soluble salt.

[0009] Therefore, the cement kiln flue gas bypass dechlorination system provided by the present invention can extract the flue gas from the kiln tail smoke chamber (decomposition furnace) and rapidly cool it, so that the gaseous chloride ions in the flue gas form chlorine crystals after cooling and adsorb on the dust particles (hot raw materials), and then filter them through the dust filter component, thereby destroying the original chloride ion enrichment cycle, reducing the chloride ion content of the cement kiln system, thereby improving the cement output quality and reducing the frequency of crust cleaning.

[0010] In an optional embodiment of the present application, the discharge control valve includes: a valve body, the valve body is provided with a discharge channel, and the discharge channel can communicate with the refrigerant storage tank and the coolant flow chamber; a rotating shaft, the rotating shaft is inserted in the discharge channel, and the side wall of the rotating shaft is spaced apart from the side wall of the discharge channel; a fixed valve plate, the fixed valve plate can block the discharge channel, and the fixed valve plate is provided with a fixed discharge hole; a rotating valve plate, the rotating valve plate is sleeved on the middle part of the rotating shaft, the rotating valve plate is transmission-connected with the rotating shaft, the rotating valve plate is provided with a rotating discharge hole, and the lower side of the rotating valve plate abuts against the fixed valve plate; wherein, the relative position of the rotating discharge hole and the fixed discharge hole is controlled by the rotation of the rotating valve plate to control the discharge speed and opening and closing of the discharge control valve, so as to accurately control the discharge speed of the water-soluble salt particles through the discharge control valve to avoid wasting the water-soluble salt particles.

[0011] In an optional embodiment of the present application, a scraper blade is provided at the upper end of the rotating shaft, one end of the scraper blade is fixedly connected to the rotating shaft, and the other end of the scraper blade is in contact with the lower side wall of the refrigerant storage tank, and the scraper blade can rotate together with the rotating shaft to drive the scraper blade to rotate through the rotating shaft, thereby preventing the water-soluble salt particles from forming a material arch in the refrigerant storage tank and failing to output the water-soluble salt particles normally.

[0012] In an optional embodiment of the present application, the cooling shell is a cylindrical structure; the heat-conducting insulator includes a coolant flow cylinder, and the coolant flow cylinder has a cylindrical structure; the coolant flow cylinder is concentrically arranged with the cooling shell, and the ventilation cavity is a cavity between the cooling shell and the coolant flow cylinder, and the coolant flow cavity is an inner cavity of the coolant flow cylinder, so as to facilitate the installation of the heat exchanger and avoid interference between the feeding channel of water-soluble salt particles and normal temperature clean water and the flue gas channel.

[0013] In an optional embodiment of the present application, the thermal insulator includes a plurality of thermally conductive fins, and the plurality of thermally conductive fins are evenly distributed on the circumference of the outer wall of the coolant flow tube, and each of the thermally conductive fins extends axially along the coolant flow tube to ensure that the thermal insulation has sufficient thermal conductive area.

[0014] In an optional embodiment of the present application, it also includes a dust cleaner, which includes: a cleaning mechanism, which is arranged in the cooling shell; a temperature-sensitive drive, which can automatically drive the cleaning mechanism to move along the axial direction of the thermal insulator according to the temperature of the flue gas discharged from the dust removal module, so as to automatically clean the surface of the thermal insulator.

[0015] After the flue gas temperature drops sharply, the volatile components quickly condense into chlorine crystals, which are easily attached to the surface of the heat-conducting individual, thereby reducing the thermal conductivity of the heat-conducting insulator, making the exhaust flue gas temperature higher and affecting the subsequent separation of chloride ions. When the flue gas temperature becomes high, the temperature-sensing driver is triggered to drive the cleaning mechanism to move along the axial direction of the heat-conducting insulator, and then automatically clean the surface of the heat-conducting insulator, and the heat-conducting capacity of the heat-conducting insulator is restored, thereby ensuring that the dechlorination system can remove chlorine normally. The temperature-sensing driver is set at the exhaust end of the dust removal module to prevent particles in the flue gas from adhering to the temperature-sensing driver, so as to ensure that the temperature-sensing driver can work normally.

[0016] In an optional embodiment of the present application, the cleaning mechanism includes: a cleaning ring, which is arranged outside the thermal insulator; a cleaning scraper, which is provided with a plurality of cleaning scrapers, and each of the cleaning scrapers is fixedly connected to the cleaning ring, and the other end of each cleaning scraper is in contact with the side wall of the thermal insulator; wherein the cleaning ring can slide downward along the axial direction of the thermal insulator under the action of its own gravity, so that the temperature-sensing driver can clean from bottom to bottom when driving the cleaning mechanism to move, thereby ensuring that the cleaning mechanism can clean the entire thermal insulator, and the cleaning ring is reset under the action of gravity after losing the driving force, so that the cleaning mechanism can reciprocate and clean the thermal insulation.

[0017] In an optional embodiment of the present application, the temperature-sensing driver includes: a temperature-sensing bag, which is used to store an expansion medium, the temperature-sensing bag is made of a heat-conductive material, and the temperature-sensing bag is arranged at the exhaust end of the dust removal module; a driving cylinder, the driving cylinder includes a driving cylinder body, a driving piston is adapted in the driving cylinder body, the driving piston is connected to the cleaning mechanism through a driving rod, and the feeding end of the driving cylinder is connected to the temperature-sensing bag; wherein the expansion medium in the temperature-sensing bag expands due to heat and enters the driving cylinder to drive the driving piston to move upward, thereby driving the cleaning mechanism to move upward from the bottom of the heat-conductive insulator, so as to ensure that the temperature-sensing driver can drive the cleaning mechanism to automatically clean after the thermal conductivity of the heat-conductive insulator is reduced.

[0018] In an optional embodiment of the present application, the heat exchanger also includes a stirring paddle, which is arranged in the coolant flow cylinder; the stirring paddle can rotate along its own axis, and the stirring paddle is transmission-connected to the rotating shaft. On the one hand, the stirring paddle can drive the discharge control valve to discharge the material, and on the other hand, the stirring paddle can make the water-soluble salt particles fully dissolved to avoid wasting the water-soluble salt, and make the water-soluble salt solution quickly flush the heat-conducting insulator, ensuring that the salt solution can fully and quickly exchange heat with the flue gas.

[0019] In an optional embodiment of the present application, the dust removal module includes: a cyclone dust collector, the air inlet end of the cyclone dust collector is connected to the exhaust end of the ventilation chamber, and the dust outlet of the cyclone dust collector is higher than the bottom of the decomposition furnace in the working state; a bag dust collector, the air inlet end of the bag dust collector is connected to the exhaust end of the cyclone dust collector. Thus, the cooled flue gas is preliminarily filtered by the cyclone dust collector to intercept the flue gas with large particles (particle size>35μm), and return to the decomposition chlorine to reduce heat consumption and reduce the amount of chlorine ash removed.

[0020] Beneficial effects of the present invention:

[0021] The cement kiln flue gas bypass dechlorination system provided by the present invention comprises a water storage tank, a refrigerant storage tank, a heat exchanger, a dust removal module and an induced draft fan, wherein the water storage tank is used to store clean water, the refrigerant storage tank is used to store water-soluble salt particles, and a discharge control valve is arranged at the lower end of the refrigerant storage tank, the discharge control valve can control the discharge speed of the refrigerant storage tank, the heat exchanger comprises a cooling shell, the inner cavity of the cooling shell is divided into a ventilation cavity and a coolant flow cavity by a heat-conducting insulator, the air inlet end of the ventilation cavity is connected to the kiln tail smoke chamber of the decomposition furnace in a working state, the feed end of the coolant flow cavity is connected to the drain port of the water storage tank and the discharge port of the discharge control valve at the same time, and the discharge end of the coolant flow cavity is higher than the feed end of the coolant flow cavity, The dust module is connected to the exhaust port of the heat exchanger. The dust removal module can filter particles in the flue gas discharged by the heat exchanger. The air inlet end of the induced draft fan is connected to the exhaust port of the dust removal module. The clean water in the water tank and the water-soluble salt particles in the refrigerant tank can be discharged into the coolant flow cavity under the action of gravity, so that the water-soluble salt particles produce a dissolution reaction and quickly absorb a large amount of heat, thereby forcing the flue gas temperature to drop sharply, so that the volatile components in the flue gas are quickly condensed into chlorine crystals and attached to the surface of the flue gas particles, so as to separate the chloride ions from the flue gas, thereby destroying the original chloride ion enrichment cycle, reducing the chloride ion content of the cement kiln system, thereby improving the cement output quality and reducing the frequency of crust cleaning. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, constitute a part of this application, and do not constitute a limitation of the embodiments of the present invention. In the drawings:

[0023] Figure 1 This is a schematic diagram of the process flow of a cement kiln flue gas bypass dechlorination system according to an embodiment of the present invention;

[0024] Figure 2 This is a schematic structural diagram of a refrigerant storage tank according to an embodiment of the present invention;

[0025] Figure 3 It is a structural schematic diagram of the heat exchanger part of an embodiment of the present invention;

[0026] Figure 4 for Figure 3 Schematic diagram of the enlarged structure of part A.

[0027] Marks and corresponding parts names in the attached drawings:

[0028] 100- water storage tank;

[0029] 200-refrigerant storage tank, 210-discharging control valve, 211-valve body, 211a-discharging channel, 212-rotating shaft, 213-fixed valve plate, 213a-discharging hole, 214-rotating valve plate, 214a-rotating discharging hole, 215-scraping sheet;

[0030] 300-heat exchanger, 310-cooling shell, 311-heat-conducting insulator, 311a-coolant flow cylinder, 311b-heat-conducting fins, 312-ventilation chamber, 313-coolant flow chamber, 320-stirring paddle, 330-driving motor, 340-liquid discharge elbow, 350-material delivery pipe, 360-smoke inlet ring box, 370-smoke exhaust ring box;

[0031] 400-calciner;

[0032] 500-dust removal module, 510-cyclone dust collector, 520-bag dust collector;

[0033] 600- induced draft fan;

[0034] 700-dust cleaner, 710-cleaning mechanism, 711-cleaning ring, 712-cleaning scraper, 720-temperature sensing driver, 721-temperature sensing bag, 722-driving cylinder, 722a-driving cylinder, 722b-driving piston, 722c-driving rod. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0036] In the description of the embodiments of the present application, the terms "center", "up", "down", "left", "right", "vertical", "longitudinal", "lateral", "horizontal", "inside", "outside", "front", "back", "top", "bottom", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the products of the application are conventionally placed when in use, or are the orientations or positional relationships conventionally understood by those skilled in the art. They are merely for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0037] In the description of the present invention, unless otherwise clearly specified and limited, the terms "disposed", "opened", "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be internal communication between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] Example

[0039] Combination Figure 1-Figure 3The present embodiment provides a cement kiln flue gas bypass dechlorination system, comprising: a water storage tank 100, the water storage tank 100 is used to store clean water; a refrigerant storage tank 200, the refrigerant storage tank 200 is used to store water-soluble salt particles, and a discharge control valve 210 is provided at the lower end of the refrigerant storage tank 200, and the discharge control valve 210 can control the discharge speed of the refrigerant storage tank 200; a heat exchanger 300, the heat exchanger 300 comprises a cooling shell 310, the inner cavity of the cooling shell 310 is divided into a ventilation cavity 312 and a coolant flow cavity 313 by a heat-conducting insulator 311, the air inlet end of the ventilation cavity 312 is connected to the kiln tail smoke chamber of the decomposition furnace 400 in the working state, and the cooling The feed end of the coolant flow chamber 313 is simultaneously connected to the drain port of the water storage tank 100 and the discharge port of the discharge control valve 210, and the discharge end of the coolant flow chamber 313 is higher than the feed end of the coolant flow chamber 313; the dust removal module 500, the dust removal module 500 is connected to the exhaust port of the heat exchanger 300, and the dust removal module 500 can filter the particles in the smoke discharged by the heat exchanger 300; the induced draft fan 600, the air inlet end of the induced draft fan 600 is connected to the exhaust port of the dust removal module 500; wherein, the clean water in the water storage tank 100 and the water-soluble salt particles in the refrigerant storage tank 200 can be discharged into the coolant flow chamber 313 under the action of gravity.

[0040] Combination Figure 2 Specifically, the discharge control valve 210 includes: a valve body 211, the valve body 211 is provided with a discharge channel 211a, and the discharge channel 211a can communicate with the refrigerant storage tank 200 and the coolant flow chamber 313; a rotating shaft 212, the rotating shaft 212 is inserted in the discharge channel 211a, and the side wall of the rotating shaft 212 is spaced from the side wall of the discharge channel 211a; a fixed valve plate 213, the fixed valve plate 213 can block the discharge channel 211a, and the fixed valve plate 213 is provided with a fixed discharge hole 213a; a rotating valve plate 214, The rotary valve plate 214 is sleeved on the middle part of the rotating shaft 212, and the rotary valve plate 214 is transmission connected to the rotating shaft 212. The rotary valve plate 214 is provided with a rotary discharge hole 214a, and the lower side surface of the rotary valve plate 214 is in contact with the fixed valve plate 213; wherein, the relative position of the rotary discharge hole 214a and the fixed discharge hole 213a is controlled by the rotation of the rotary valve plate 214 to control the discharge speed and opening and closing of the discharge control valve 210, so as to accurately control the discharge speed of the water-soluble salt particles through the discharge control valve 210 to avoid wasting water-soluble salt particles.

[0041] On this basis, a scraper piece 215 is provided at the upper end of the rotating shaft 212, one end of the scraper piece 215 is fixedly connected to the rotating shaft 212, and the other end of the scraper piece 215 is in contact with the lower end side wall of the refrigerant storage tank 200, and the scraper piece 215 can rotate together with the rotating shaft 212, so as to drive the scraper piece 215 to rotate through the rotating shaft 212, thereby preventing the water-soluble salt particles from forming a material arch in the refrigerant storage tank 200 and failing to output the water-soluble salt particles normally.

[0042] Combination Figure 3 It can be understood that the cooling shell 310 is a cylindrical structure; the heat-conducting insulator 311 includes a coolant flow tube 311a, and the coolant flow tube 311a is a cylindrical structure; the coolant flow tube 311a is concentrically arranged with the cooling shell 310, and the ventilation cavity 312 is a cavity between the cooling shell 310 and the coolant flow tube 311a, and the coolant flow cavity 313 is the inner cavity of the coolant flow tube 311a, so as to facilitate the installation of the heat exchanger 300 and avoid interference between the feeding channel of water-soluble salt particles and normal temperature clean water and the flue gas channel.

[0043] At the same time, a drain elbow 340 is connected to the bottom of the coolant flow tube 311a, and the outlet of the drain elbow 340 is higher than the top of the coolant flow tube 311a, so that the discharge end of the coolant flow chamber 313 is higher than its feed end. An annular flue gas intake ring box 360 is arranged at the lower end of the cooling shell 310, and a flue gas exhaust ring box 370 is arranged at the upper end. The inner cavities of the flue gas intake ring box 360 and the flue gas exhaust ring box 370 are both connected to the ventilation chamber 312. The flue gas intake ring box 360 is used to connect to the outlet pipe of the kiln tail smoke chamber of the decomposition furnace 400, and the flue gas exhaust ring box 370 is connected to the air intake end of the dust removal module 500. A material delivery pipe 340 is also provided at the upper end of the cooling shell 310. The material delivery pipe 340 is arranged in a circular channel in the middle of the flue gas exhaust ring box 370, and the lower end of the material delivery pipe 340 is connected to the upper end of the coolant flow tube 311a, and the upper end is also connected to the drain outlet of the water storage tank 100 and the discharge port of the material discharge control valve 210.

[0044] Generally speaking, the thermal insulator 311 includes a plurality of thermal fins 311b, which are evenly distributed on the outer wall of the coolant flow tube 311a, and each thermal fin 311b extends axially along the coolant flow tube 311a to ensure that the thermal insulation has sufficient thermal conductivity area.

[0045] In this embodiment, the heat exchanger 300 also includes a stirring paddle 320, and the stirring paddle 320 is arranged in the coolant flow tube 311a; the stirring paddle 320 can rotate along its own axis, and the stirring paddle 320 is connected to the rotating shaft 212 in a transmission manner. On the one hand, the stirring paddle 320 can drive the discharge control valve 210 to discharge, and on the other hand, the stirring paddle 320 can make the water-soluble salt particles fully dissolved to avoid wasting water-soluble salt, and the water-soluble salt solution can quickly flush the heat-conducting insulator 311, ensuring that the salt solution can fully and quickly exchange heat with the flue gas.

[0046] It should be understood that the stirring paddle 320 is adapted to be equipped with a driving motor 330, such as a servo motor or a stepping motor, so that the stirring paddle 320 and the rotating shaft 212 can be driven to rotate synchronously by a single motor, which can simplify the structure of the device on the one hand, and on the other hand, can match the discharge speed of the discharge control valve 210 with the stirring speed of the stirring paddle 320, so as to avoid the stirring speed of the stirring paddle 320 being much greater than the required stirring speed, thereby causing energy waste. In this embodiment, the driving motor 330 is arranged in the circular channel in the middle of the smoke inlet ring box 360.

[0047] Combination Figure 1 and Figure 3 This embodiment also includes a dust cleaner 700, which includes: a cleaning mechanism 710, which is arranged in the cooling shell 310; a temperature-sensing driver 720, which can automatically drive the cleaning mechanism 710 to move along the axial direction of the thermal insulator 311 according to the temperature of the flue gas discharged from the dust removal module 500, so as to automatically clean the surface of the thermal insulator 311.

[0048] After the flue gas temperature drops sharply, the volatile components quickly condense into chlorine crystals, which are easily attached to the surface of the heat-conducting individual, thereby reducing the thermal conductivity of the heat-conducting insulator 311, making the exhaust flue gas temperature higher and affecting the subsequent separation of chloride ions. When the flue gas temperature becomes high, the temperature-sensing driver 720 is triggered to drive the cleaning mechanism 710 to move along the axial direction of the heat-conducting insulator 311, thereby automatically cleaning the surface of the heat-conducting insulator 311, and the heat-conducting capacity of the heat-conducting insulator 311 is restored, thereby ensuring that the dechlorination system can dechlorinate normally. The temperature-sensing driver 720 is set at the exhaust end of the dust removal module 500, which can prevent particles in the flue gas from adhering to the temperature-sensing driver 720, so as to ensure that the temperature-sensing driver 720 can work normally.

[0049] Combination Figure 4The cleaning mechanism 710 includes: a cleaning ring 711, the cleaning ring 711 is arranged outside the heat-conducting insulator 311; a cleaning scraper 712, the cleaning scraper 712 is provided with a plurality of pieces, and each of the cleaning scrapers 712 is fixedly connected to the cleaning ring 711, and the other end of each of the cleaning scrapers 712 abuts against the side wall of the heat-conducting insulator 311 (the cross-sectional shape of each cleaning scraper 712 is adapted to the cross-sectional shape of the cavity between two adjacent heat-conducting fins 311b). ); wherein, the cleaning ring 711 can slide downward along the axial direction of the thermal insulator 311 under the action of its own gravity, so that the temperature-sensing driver 720 can clean from bottom to bottom when driving the cleaning mechanism 710 to move, ensuring that the cleaning mechanism 710 can clean the entire thermal insulator 311, and the cleaning ring 711 resets under the action of gravity after losing the driving force, so that the cleaning mechanism 710 can reciprocately clean the thermal insulation.

[0050] Among them, the temperature-sensing driver 720 includes: a temperature-sensing bag 721, which is used to store the expansion medium, the temperature-sensing bag 721 is made of heat-conducting material, and the temperature-sensing bag 721 is arranged at the exhaust end of the dust removal module 500; a driving cylinder 722, the driving cylinder 722 includes a driving cylinder body 722a, and a driving piston 722b is adapted in the driving cylinder body 722a, the driving piston 722b is connected to the cleaning mechanism 710 through a driving rod 722c, and the feeding end of the driving cylinder 722 is connected to the temperature-sensing bag 721; wherein, the expansion medium in the temperature-sensing bag 721 expands due to heat and enters the driving cylinder 722 to drive the driving piston 722b to move upward, thereby driving the cleaning mechanism 710 to move upward from the bottom of the heat-conducting insulator 311, so as to ensure that the temperature-sensing driver 720 can drive the cleaning mechanism 710 to automatically clean after the thermal conductivity of the heat-conducting insulator 311 is reduced.

[0051] Combine again Figure 1 The dust removal module 500 includes: a cyclone dust collector 510, the air inlet end of the cyclone dust collector 510 is connected to the exhaust end of the ventilation chamber 312, and the dust outlet of the cyclone dust collector 510 is higher than the bottom of the decomposition furnace 400 in the working state; a bag dust collector 520, the air inlet end of the bag dust collector 520 is connected to the exhaust end of the cyclone dust collector 510. Thus, the cooled flue gas is preliminarily filtered by the cyclone dust collector 510 to intercept the flue gas with large particles (particle size>35μm), and return it to the decomposition furnace 400 to reduce heat consumption and reduce the amount of chlorine ash removed.

[0052] In summary, the cement kiln flue gas bypass dechlorination system provided in this embodiment includes a water storage tank 100, a refrigerant storage tank 200, a heat exchanger 300, a dust removal module 500 and an induced draft fan 600. The water storage tank 100 is used to store clean water, the refrigerant storage tank 200 is used to store water-soluble salt particles, and a discharge control valve 210 is provided at the lower end of the refrigerant storage tank 200. The discharge control valve 210 can control the discharge speed of the refrigerant storage tank 200. The heat exchanger 300 includes a cooling shell 310. The inner cavity of the cooling shell 310 is divided into a ventilation cavity 312 and a coolant flow cavity 313 by a heat conductive insulator 311. The air inlet end of the ventilation cavity 312 is in the working state. In this state, it is connected to the kiln tail smoke chamber of the decomposition furnace 400, the feed end of the coolant flow chamber 313 is simultaneously connected to the drain port of the water storage tank 100 and the discharge port of the discharge control valve 210, and the discharge end of the coolant flow chamber 313 is higher than the feed end of the coolant flow chamber 313, the dust removal module 500 is connected to the exhaust port of the heat exchanger 300, the dust removal module 500 can filter the particles in the smoke discharged by the heat exchanger 300, the air inlet end of the induced draft fan 600 is connected to the exhaust port of the dust removal module 500, and the clean water in the water storage tank 100 and the water-soluble salt particles in the refrigerant storage tank 200 can be discharged into the coolant flow chamber 313 under the action of gravity.

[0053] When in use, clean water at room temperature is stored in the water storage tank 100, water-soluble salt particles are stored in the refrigerant storage tank 200, the air inlet end of the ventilation cavity 312 of the heat exchanger 300 is connected to the kiln tail smoke chamber of the decomposition furnace 400, and the exhaust end of the induced draft fan 600 is connected to the air inlet end of the denitration system. Then, the drain valve of the water storage tank 100 is opened, the drive motor 330 is started, and the induced draft fan 600 is started, so that the clean water at room temperature and the water-soluble salt particles enter the coolant flow cavity 313 under the action of their own gravity, and at the same time, the flue gas in the kiln tail smoke chamber of the decomposition furnace 400 is introduced into the heat exchanger. In the ventilation chamber 312 of 300, when the water-soluble salt particles are combined with clean water at room temperature and stirred, the water-soluble salt particles undergo a dissolution reaction and quickly absorb a large amount of heat. The ventilation chamber 312 and the coolant flow chamber 313 are separated by the heat-conducting insulator 311, so that the water-soluble salt particles quickly absorb the heat in the flue gas during the dissolution reaction, thereby forcing the flue gas temperature to drop sharply. At this time, the volatile components in the flue gas are quickly condensed into chlorine crystals and attached to the surface of the flue gas particles to separate the chloride ions from the flue gas, thereby destroying the original chloride ion enrichment cycle and reducing the chloride ion content of the cement kiln system.

[0054] The flue gas after cooling first enters the cyclone dust collector 510 under the action of the induced draft fan 600. Under the action of centrifugal force, large flue gas particles are separated from the flue gas and returned to the decomposition furnace 400 from the lower end of the cyclone dust collector 510. The flue gas after preliminary dust removal is further introduced into the bag filter 520, where the dust removal bags filter and intercept the flue gas particles. The flue gas filtered by the dust removal module 500 is discharged into the denitrification system by the induced draft fan 600 for further treatment, and the flue gas particles containing chloride ions are collected by the dust removal module for further treatment.

[0055] Among them, the discharge end of the coolant flow chamber 313 is higher than the feed end of the coolant flow chamber 313, so that the water-soluble salt aqueous solution is discharged from the coolant flow chamber 313 after filling the coolant flow chamber 313. On the one hand, the water-soluble salt particles can be fully dissolved to avoid the waste of water-soluble salt particles. On the other hand, the water-soluble salt aqueous solution can fully exchange heat with the flue gas. The salt solution discharged from the coolant flow chamber 313 is stored in a storage container for heat preservation, which is convenient for the subsequent recovery and treatment of the water-soluble salt.

[0056] Therefore, the cement kiln flue gas bypass dechlorination system provided in this embodiment can extract the flue gas from the kiln tail smoke chamber (decomposition furnace 400) and rapidly cool it, so that the gaseous chloride ions in the flue gas form chlorine crystals after cooling and adsorb on the dust particles (hot raw materials), and then filter them through the dust filter component, thereby destroying the original chloride ion enrichment cycle, reducing the chloride ion content of the cement kiln system, thereby improving the cement output quality and reducing the frequency of crust cleaning.

[0057] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A cement kiln flue gas bypass dechlorination system, characterized in that: include: A water storage tank (100), wherein the water storage tank (100) is used to store clean water; A refrigerant storage tank (200), the refrigerant storage tank (200) being used to store water-soluble salt particles, and a discharge control valve (210) being provided at the lower end of the refrigerant storage tank (200), the discharge control valve (210) being capable of controlling a discharge speed of the refrigerant storage tank (200); A heat exchanger (300), the heat exchanger (300) comprising a cooling shell (310), the inner cavity of the cooling shell (310) being divided into a ventilation cavity (312) and a coolant flow cavity (313) by a heat-conducting insulator (311), the air inlet end of the ventilation cavity (312) being connected to the kiln tail smoke chamber of the decomposition furnace (400) in a working state, the feed end of the coolant flow cavity (313) being connected to the drain port of the water storage tank (100) and the discharge port of the discharge control valve (210), and the discharge end of the coolant flow cavity (313) being higher than the feed end of the coolant flow cavity (313); a dust removal module (500), the dust removal module (500) being connected to the exhaust port of the heat exchanger (300), the dust removal module (500) being capable of filtering particles in the smoke exhausted by the heat exchanger (300); An induced draft fan (600), the air inlet end of the induced draft fan (600) being connected to the exhaust port of the dust removal module (500); Wherein, the clean water in the water storage tank (100) and the water-soluble salt particles in the refrigerant storage tank (200) can both be discharged into the coolant flow chamber (313) under the action of gravity; The discharge control valve (210) comprises: A valve body (211), wherein the valve body (211) is provided with a discharge channel (211a), and the discharge channel (211a) is capable of connecting the refrigerant storage tank (200) and the coolant flow chamber (313); A rotating shaft (212), the rotating shaft (212) being inserted into the material discharge channel (211a), and a side wall of the rotating shaft (212) and a side wall of the material discharge channel (211a) being spaced apart from each other; a fixed valve plate (213), the fixed valve plate (213) being capable of blocking the discharge channel (211a), and the fixed valve plate (213) being provided with a fixed discharge hole (213a); A rotary valve plate (214), the rotary valve plate (214) being sleeved on the middle portion of the rotary shaft (212), the rotary valve plate (214) being drivingly connected to the rotary shaft (212), the rotary valve plate (214) being provided with a rotary discharge hole (214a), and the lower side surface of the rotary valve plate (214) being in contact with the fixed valve plate (213); The relative position of the rotating discharge hole (214a) and the fixed discharge hole (213a) is controlled by the rotation of the rotating valve plate (214), so as to control the discharge speed and opening and closing of the discharge control valve (210); The cooling shell (310) is a cylindrical structure; The heat-conducting insulator (311) comprises a coolant flow cylinder (311a), and the coolant flow cylinder (311a) is a cylindrical structure; The coolant flow tube (311a) is arranged concentrically with the cooling shell (310), the ventilation cavity (312) is a cavity between the cooling shell (310) and the coolant flow tube (311a), and the coolant flow cavity (313) is an inner cavity of the coolant flow tube (311a); The heat-conducting insulator (311) comprises a plurality of heat-conducting fins (311b), the plurality of heat-conducting fins (311b) are uniformly distributed on the circumference of the outer wall of the coolant flow tube (311a), and each of the heat-conducting fins (311b) extends along the axial direction of the coolant flow tube (311a); It also includes a dust cleaner (700), wherein the dust cleaner (700) includes: a cleaning mechanism (710), the cleaning mechanism (710) being arranged in the cooling shell (310); A temperature-sensing driver (720) capable of automatically driving the cleaning mechanism (710) to move along the axial direction of the heat-conducting insulator (311) according to the temperature of the smoke exhausted by the dust removal module (500), so as to automatically clean the surface of the heat-conducting insulator (311).

2. The cement kiln flue gas bypass dechlorination system according to claim 1, characterized in that: A scraper blade (215) is provided at the upper end of the rotating shaft (212); one end of the scraper blade (215) is fixedly connected to the rotating shaft (212); the other end of the scraper blade (215) abuts against the lower end side wall of the refrigerant storage tank (200); and the scraper blade (215) can rotate together with the rotating shaft (212).

3. The cement kiln flue gas bypass dechlorination system according to claim 1, characterized in that: The cleaning mechanism (710) comprises: A cleaning ring (711), the cleaning ring (711) being arranged outside the heat-conducting insulator (311); A cleaning scraper (712), wherein a plurality of cleaning scrapers (712) are provided, and each cleaning scraper (712) is fixedly connected to the cleaning ring (711), and the other end of each cleaning scraper (712) abuts against the side wall of the heat-conducting insulator (311); Wherein, the cleaning ring (711) can slide downward along the axial direction of the heat-conducting insulator (311) under the action of its own weight.

4. The cement kiln flue gas bypass dechlorination system according to claim 1, characterized in that: The temperature sensing driver (720) comprises: A temperature sensing bag (721), the temperature sensing bag (721) is used to store an expansion medium, the temperature sensing bag (721) is made of a heat-conductive material, and the temperature sensing bag (721) is arranged at the exhaust end of the dust removal module (500); A driving cylinder (722), the driving cylinder (722) comprising a driving cylinder body (722a), a driving piston (722b) being adapted to be disposed inside the driving cylinder body (722a), the driving piston (722b) being connected to the cleaning mechanism (710) via a driving rod (722c), and a feeding end of the driving cylinder (722) being connected to the temperature sensing bag (721); The expansion medium in the temperature-sensing bag (721) expands due to heat and enters the driving cylinder (722) to drive the driving piston (722b) to move upward, thereby driving the cleaning mechanism (710) to move upward from the bottom of the heat-conducting insulator (311).

5. The cement kiln flue gas bypass dechlorination system according to claim 4, characterized in that: The heat exchanger (300) further comprises a stirring paddle (320), wherein the stirring paddle (320) is arranged in the coolant flow cylinder (311a); The stirring paddle (320) is capable of rotating along its own axial direction, and the stirring paddle (320) is transmission-connected to the rotating shaft (212).

6. The cement kiln flue gas bypass dechlorination system according to any one of claims 1 to 5, characterized in that: The dust removal module (500) comprises: a cyclone dust collector (510), wherein an air inlet end of the cyclone dust collector (510) is connected to an exhaust end of the ventilation cavity (312), and a dust exhaust port of the cyclone dust collector (510) is higher than the bottom of the decomposition furnace (400) in a working state; A bag dust collector (520), wherein an air inlet end of the bag dust collector (520) is connected to an exhaust end of the cyclone dust collector (510).

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