Tunnel kiln for calcining sodium zirconate
By designing a continuous production tunnel kiln with integrated fully automated control functions, the problems of long production cycle, low output, high energy consumption and difficult exhaust gas treatment in the process of liquid material heating and calcination in existing kiln equipment have been solved, and efficient and automated sodium zirconate production has been achieved.
Patent Information
- Application Number
- CN202423095198.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-16
- Publication Date
- 2025-10-10
- Estimated Expiration
- 2034-12-16
AI Technical Summary
Existing kiln equipment has problems such as long production cycle, low output, high unit energy consumption, inconvenient loading and unloading, and difficult treatment of flue gas and reaction gas emissions during the process of heating and calcining liquid materials.
A continuous production tunnel kiln is designed with integrated fully automated control functions, including a liquid caustic soda feeding device, a smoke exhaust port, a kiln bottom direct flame burner, a side wall direct flame burner, a cooling device, etc., to achieve continuous heating and cooling of materials and automated operation.
It realizes the continuous production of the kiln, increases the output, reduces the unit energy consumption, simplifies the loading and unloading process, realizes the harmless treatment of exhaust gas, and improves the degree of production automation.
Smart Images
Figure CN223425690U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the field of kiln equipment, and in particular relates to a tunnel kiln used for continuously calcining and heating liquid materials. Background Art
[0002] Currently, the kiln equipment used in the industry for heating and calcining liquid materials is primarily a shuttle kiln, employing an intermittent production method. This involves placing the material in a tank and heating it through a burner until it reaches the set temperature. Raw materials such as zircon sand are then added, followed by heating and calcination through a direct-flame burner. Sodium zirconate is produced after the reaction, followed by cooling with cold air until the temperature drops to around 60°C. The tank is then lifted out of the tank by a crane for manual unloading. This repetitive process, operating under long-term, harsh production conditions, results in long production cycles, low output, high unit energy consumption, inconvenient loading and unloading, and difficult exhaust and disposal of flue gases and reaction gases. Consequently, designing a kiln for continuous production has become a pressing challenge. Utility Model Content
[0003] The purpose of the utility model is to provide a tunnel kiln for calcining sodium zirconate in a continuous production mode, which is convenient and simple to load and unload, and integrates fully automatic control functions such as feeding, smoke exhaust, preheating, temperature rising, heating, exhaust, and cooling.
[0004] The technical solution of this utility model comprises a kiln frame, kiln walls, kiln roof, kiln floor, kiln car, material tanks, and a heating device. A liquid alkali charging device is installed on the roof of the first kiln section in the preheating zone, and smoke exhaust vents are located at the lower part of the kiln walls on both sides to discharge furnace flue gases. Empty kiln tanks, transported to the first section by the kiln car, are fed with a fixed amount of liquid alkali by the liquid alkali charging device and then pushed into the second section by the kiln overhead crane. Furnace flue gases preheat the tanks and materials. Direct-flame burners are installed at the kiln floor of the heating zone, along with natural gas and combustion-supporting air pipelines. Heat generated by the gas combustion heats the material tanks and materials sequentially according to process requirements to meet these requirements. A zircon sand charging device is installed at the kiln roof of the high-temperature zone, and side-wall direct-flame burners and fire-viewing holes are staggered on both sides of the kiln walls. Natural gas and combustion-supporting air pipelines are also installed. Reaction gas exhaust pipelines are installed at the kiln roofs of both the heating and high-temperature zones. Direct-flame burners installed on the side walls prevent the violent reaction of zircon sand after addition, which could cause boiling and overflow and clog the burners at the kiln bottom. Cooling devices are installed on the kiln walls on both sides of the cooling zone to cool the material tanks and the sodium zirconate product they contain. Kiln car tracks are installed on the upper parts of both walls. The wheels on the bottom of the kiln car rest on the tracks, and the material tanks are suspended in a circular hole in the center of the kiln car frame.
[0005] Furthermore, the liquid alkali feeding device is composed of a liquid alkali feeding pipe and a solenoid valve arranged on the top of the first section of the preheating zone. The lower end of the liquid alkali feeding pipe extends into the kiln chamber and is placed above the material tank, and the upper end is connected to the liquid alkali supply pipe through an electromagnetic.
[0006] Furthermore, the zircon sand feeding device is composed of a pot-shaped material tank cover and a feeding pipe mouth. The pot-shaped material tank cover is fixedly installed on the kiln roof, with the lower opening facing the upper opening of the kiln car feeding tank, and the feeding pipe mouth is set at the center position of the cover top.
[0007] Furthermore, the reaction gas exhaust pipeline is composed of an exhaust gas main pipe and a reaction gas exhaust branch pipe. The reaction gas exhaust branch pipe is arranged on the kiln roof of the kiln heating zone and the high-temperature zone, and is connected to the exhaust gas main pipe fixedly installed on the kiln roof. The exhaust gas main pipe is connected to the exhaust gas treatment system pipeline through an induced draft fan.
[0008] Furthermore, each section of the heating zone and high-temperature zone is provided with a fire retaining wall made of refractory materials, which can stabilize the flame and temperature in the kiln and is conducive to the control and regulation of temperature and pressure.
[0009] Furthermore, an infrared thermometer is provided on the pot-shaped material tank cover of the zircon sand feeding device to measure the material temperature in real time. When the material in the material tank reaches the set temperature, a fixed amount of zircon sand is added to produce sodium zirconate after reaction.
[0010] Furthermore, the cooling system consists of cooling air branches and main cooling air pipes. Specifically, upper and lower cooling air branches are installed below the material tanks on both sides of the kiln wall. These branches are connected to the main cooling air pipes located below the kiln walls on both sides via pipes. Cooling by the cooling air branches on the side walls can reduce the temperature of the product leaving the kiln, facilitating subsequent unloading processes such as the return line.
[0011] The beneficial effects of the utility model are: continuous production is achieved by adopting the tunnel kiln, and the kiln integrates the functions of feeding, smoke exhaust, preheating, temperature rising, heating, exhaust, cooling, full-automatic loading and unloading, and full-automatic control.
[0012] (1) The tunnel kiln for producing sodium zirconate is provided with a liquid alkali feeding device at the top of the first section to realize quantitative automatic feeding; and then the first section is provided with a smoke exhaust port in the kiln chamber.
[0013] (2) A direct flame burner is installed at the bottom of the heating zone of the tunnel kiln for producing sodium zirconate. The heat generated by the combustion of gas is used to heat the tank and materials in sequence according to the process requirements.
[0014] (3) The tunnel kiln for producing sodium zirconate has two direct flame burners on the side walls of the firing zone, and a zircon sand adding device is provided on the top of the firing zone. When the material in the tank reaches the set temperature, a fixed amount of zircon sand is added to produce sodium zirconate after the reaction. At the same time, a reaction gas pipeline is provided on the top, which is discharged through the induced draft fan and treated for discharge.
[0015] (4) Two fire-blocking walls (made of refractory materials) are set in front and behind each material tank of the tunnel kiln for producing sodium zirconate, which play a role in stabilizing the flame and temperature in the kiln and are conducive to the control and regulation of temperature and pressure.
[0016] (5) The cooling section of the tunnel kiln for producing sodium zirconate and the cooling of the cooling air branch pipes on the side walls reduce the temperature of the product out of the kiln and facilitate the unloading of the subsequent return line and other processes.
[0017] (6) The flue gas generated by the direct flame burner is discharged through the exhaust fan in the preheating furnace, and the organic waste gas generated by the reaction in the tank is introduced into the exhaust gas treatment system through the exhaust pipe on the top of the burning belt to achieve harmless emission; the two exhaust gases do not interfere with each other.
[0018] The tunnel kiln for calcining sodium zirconate has the advantages of reasonable structural design, compact and reasonable preheating, heating, feeding and cooling processes, fully automated production, convenient loading and unloading and maintenance, and low unit energy consumption. It can be widely used in industries that require liquid calcination and heating, and has a very broad market prospect.
[0019] The following structural drawings further illustrate the present invention. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 This is a schematic diagram of the main structure of the preheating zone of the utility model;
[0021] Figure 2 This is a schematic diagram of the cross-sectional structure of the first section of the preheating zone where alkali is added in the present invention;
[0022] Figure 3 This is a schematic diagram of the main structure of the heating belt of the utility model;
[0023] Figure 4 This is a schematic diagram of the cross-sectional structure of the heating belt of the utility model;
[0024] Figure 5 This is a schematic diagram of the main structure of the high temperature belt of the utility model;
[0025] Figure 6 This is a schematic diagram of the cross-sectional structure of the high-temperature zone where zircon sand is added in the utility model;
[0026] Figure 7 This is a schematic diagram of the cross-sectional structure of the fire-blocking wall of the utility model;
[0027] Figure 8 This is a schematic diagram of the main structure of the cooling belt of the utility model;
[0028] Figure 9 This is a schematic diagram of the cross-sectional structure of the cooling belt of the present invention.
[0029] In the figure: 1 is the kiln frame, 2 is the kiln wall, 3 is the kiln roof, 4 is the kiln car, 5 is the material tank, 6 is the liquid alkali adding pipeline, 7 is the solenoid valve, 8 is the smoke exhaust port, 9 is the kiln bottom, 10 is the fire retaining wall, 11 is the direct flame burner at the kiln bottom, 12 is the natural gas pipeline at the kiln bottom, 13 is the combustion-supporting air pipeline at the kiln bottom, 14 is the direct flame burner on the side wall, 15 is the natural gas pipeline on the side wall, 16 is the combustion-supporting air pipeline on the side wall, 17 is the fire viewing hole, 18 is the feeding pipe port, 19 is the infrared thermometer, 20 is the pot-shaped material tank cover, 21 is the reaction gas discharge branch pipe, 22 is the exhaust gas main pipe, 23 is the cooling air main pipe, 24 is the lower cooling air branch pipe, and 25 is the upper cooling air branch pipe. DETAILED DESCRIPTION
[0030] Take the construction of a 50.6m sodium zirconate tunnel kiln as an example. Figure 1As shown in Section 9, this tunnel kiln consists of a preheating zone, a heating zone, a high-temperature zone, and a cooling zone. The kiln frame 1 is constructed of steel, and the kiln walls 2 are constructed from the inside out of refractory and thermal insulation materials. The kiln car 4 is equipped with a vehicle-mounted charging tank 5. Sections 1 and 2 are the preheating zone, sections 3-7 are the heating zone, section 8 is the high-temperature zone, and sections 10-22 are the cooling zone. A liquid caustic soda charging device is installed on the kiln roof 3 of the first section of the preheating zone. This device consists of a liquid caustic soda charging pipe 6 and a solenoid valve 7, installed on the kiln roof 3 of the first section of the preheating zone. The lower end of the liquid caustic soda charging pipe 6 extends into the kiln chamber and is positioned above the charging tank 5. The upper end is connected to the liquid caustic soda supply pipe via a solenoid valve 7. Smoke exhaust vents 8 are installed at the lower portion of the kiln walls 2 on both sides to discharge the flue gas generated by the direct-flame burners 11 in the heating zone through exhaust fans in the preheating zone furnace. A direct-flame burner 11 is installed at the heating zone kiln bottom 9, along with a natural gas pipeline 12 and a combustion-supporting air pipeline 13. A zircon sand feeding device is installed at the high-temperature zone kiln roof 3. This device consists of a pot-shaped material tank cover 20 and a feeding nozzle 18. The pot-shaped material tank cover 20 is fixedly mounted on the kiln roof 3, with its lower opening facing the upper opening of the kiln car 4 loading tank 5. The feeding nozzle 18 is located in the center of the cover, and an infrared thermometer 19 is installed on the pot-shaped material tank cover 20 to monitor the material temperature in real time. Direct-flame burners 14 and fire-viewing holes 17 are installed on the side walls, staggered on both sides of the kiln. These are accompanied by a natural gas pipeline 15 and a combustion-supporting air pipeline 16. Reaction gas exhaust pipelines are installed on the heating zone and high-temperature zone kiln roofs 3. The reaction gas exhaust pipeline consists of an exhaust gas main 22 and a reaction gas exhaust branch 21. The reaction gas exhaust branch 21 is installed on the kiln roof 3 of the heating zone and high-temperature zone of the kiln body and is connected to the exhaust gas main 22 fixed to the kiln roof 3. The exhaust gas main 22 is connected to the exhaust gas treatment system pipeline via an induced draft fan. At the same time, a fire barrier 10 is installed between each kiln section of the heating zone and the high-temperature zone. The fire barrier 10 is constructed of refractory materials and can stabilize the flame and temperature in the kiln, facilitating the control and regulation of temperature and pressure. A cooling device is installed on the kiln walls 2 on both sides of the cooling zone sections 16-22 to cool the material tank 5 and the sodium zirconate product it contains. The cooling device consists of a cooling air branch and a cooling air main. Specifically, an upper cooling air branch 25 and a lower cooling air branch 24 are installed on the kiln walls 2 on both sides corresponding to the lower part of the material tank 5, and are connected to the cooling air main 23 located at the lower part of the kiln walls 2 on both sides through pipes.
[0031] When the utility model is implemented, the material tank 5 carried by the kiln car 4 is added with liquid alkali by the liquid adding alkali device arranged at the top of the first kiln, and then is pushed into the second section by the kiln head car pushing machine, and the flue gas of the kiln hearth preheats the material tank and the liquid alkali. The material tank 5 is sequentially added into the heating zone 3-7, is heated by the direct flame burner 11 at the kiln bottom, and the liquid alkali in the material tank 5 is heated to the set temperature, then the zirconite sand is added into the eighth section of the high temperature zone, the material in the material tank 5 starts to react violently, and finally the material tank 5 is sequentially cooled by the cooling zone 9-22, is transferred to the return line by the transfer car, and is automatically unloaded, the temperature is automatically controlled, the whole system is automatically controlled without manning, the yield is high, the unit energy consumption is low, and the installation and maintenance are convenient.
[0032] The flue gas generated by the direct flame burner is discharged through the exhaust fan in the preheating zone hearth, the organic waste gas generated by the reaction in the material tank is introduced into the tail gas treatment system through the exhaust gas pipeline arranged at the top of the heating zone and the high temperature zone, harmless discharge is realized, and the two kinds of tail gas gases do not interfere with each other.
[0033] The calcined sodium zirconate continuous tunnel kiln has the advantages of reasonable structure design, convenient loading and unloading and maintenance, improved yield, reduced unit energy consumption, improved production environment, unattended workshop, high automation degree and the like, can be widely applied to industries requiring liquid calcination and heating, has very broad market prospect, and is very wide in application.
[0034] Finally, it should be noted that: the above only for preferred embodiments of the utility model, and does not limit the utility model, although the utility model is described in detail with reference to the foregoing embodiments, for the person skilled in the art, still can modify the technical scheme recorded in the foregoing each embodiment, or equivalent replacement to part of technical features. Any modification, equivalent replacement, improvement etc. made within the spirit and principle of the utility model should be included in the protection scope of the utility model.
Claims
1. A tunnel kiln for calcining sodium zirconate, comprising a kiln frame (1), kiln walls (2), a kiln roof (3), a kiln bottom (9), a kiln car (4), a charging tank (5) and a direct flame burner (14) heating device, characterized in that: A liquid alkali feeding device is provided on the first kiln roof (3) of the preheating zone, and smoke exhaust ports (8) are provided at the lower part of the kiln walls (2) on both sides; a kiln bottom direct flame burner (11) is provided on the kiln bottom (9) of the heating zone, and a kiln bottom natural gas pipeline (12) and a kiln bottom combustion air pipeline (13) are provided in conjunction with the same; a zircon sand feeding device is provided on the kiln roof (3) of the high temperature zone, and side wall direct flame burners (14) and fire-viewing holes (17) are provided on the kiln walls on both sides, and a side wall skylight is provided in conjunction with the same. A combustion air pipeline (15), a side wall combustion air pipeline (16), and a reaction gas exhaust pipeline are set on the heating zone and the high-temperature zone kiln top (3); a cooling device is set on the kiln walls (2) on both sides of the cooling zone to cool the material tank (5) and the sodium zirconate product contained therein; a kiln car track is set on the upper part of the kiln walls (2) on both sides, and the wheels set at the bottom of the kiln car (4) are placed on the kiln car track, and the material tank (5) is hung in a circular hole set in the middle of the kiln car (4) frame.
2. The tunnel kiln for calcining sodium zirconate according to claim 1, characterized in that: The liquid alkali feeding device is composed of a liquid alkali feeding pipe (6) and a solenoid valve (7) arranged on the top (3) of the first section of the preheating zone. The lower end of the liquid alkali feeding pipe (6) extends into the kiln chamber and is placed above the material tank (5). The upper end is connected to the liquid alkali supply pipe through the solenoid valve (7).
3. A tunnel kiln for calcining sodium zirconate according to claim 1 or 2, characterized in that: The zircon sand feeding device is composed of a pot-shaped material tank cover (20) and a feeding pipe opening (18). The pot-shaped material tank cover (20) is fixedly installed on the kiln roof (3), with the lower opening facing the upper opening of the kiln car (4) feeding tank (5), and the feeding pipe opening (18) is set at the center position of the cover top.
4. The tunnel kiln for calcining sodium zirconate according to claim 3, characterized in that: The reaction gas exhaust pipeline is composed of an exhaust gas main pipe (22) and a reaction gas exhaust branch pipe (21). The reaction gas exhaust branch pipe (21) is arranged on the kiln body heating zone and the high-temperature zone kiln roof (3), and is connected to the exhaust gas main pipe (22) fixedly installed on the kiln roof (3). The exhaust gas main pipe (22) is connected to the exhaust gas treatment system pipeline through an induced draft fan.
5. The tunnel kiln for calcining sodium zirconate according to claim 4, characterized in that: Each section of the heating zone and the high-temperature zone is provided with a fire retaining wall (10).
6. The tunnel kiln for calcining sodium zirconate according to claim 5, characterized in that: An infrared thermometer (19) is provided on the pot-shaped material tank cover (20) of the zircon sand feeding device.
7. A tunnel kiln for calcining sodium zirconate according to claim 6, characterized in that: The cooling device is composed of a cooling air branch pipe and a cooling air main pipe, that is, an upper cooling air branch pipe (25) and a lower cooling air branch pipe (24) are arranged at the lower part of the material tank (5) corresponding to the kiln walls (2) on both sides, and are connected to the cooling air main pipe (23) arranged at the lower part of the kiln walls (2) on both sides through pipelines.