Cement kiln tail incineration equipment suitable for various alternative fuels

Abstract

The utility model relates to the technical field of cement preparation, in particular to cement kiln tail incineration equipment suitable for various alternative fuels. The utility model discloses cement kiln tail incineration equipment suitable for various alternative fuels. The cement kiln tail incineration equipment comprises incineration equipment, a decomposing furnace, a tertiary air pipe and a screw feeder, the incineration equipment comprises a stepped incinerator and a turning plate incinerator, the incineration equipment is arranged in a plurality of positions in parallel, a feeding port of the incineration equipment is connected with a screw feeder, an air inlet of the incineration equipment is connected with a tertiary air pipe through a branch pipe, and an air outlet of the incineration equipment is connected with a decomposing furnace; the incineration equipment is internally provided with material containing tables which are sequentially lowered, and the material containing tables are used for stirring materials in an overturning and / or blowing mode. The device has the advantages that the device can be suitable for simultaneous incineration of various alternative fuels, and it is guaranteed that each alternative fuel enters the decomposing furnace after being burnt out.

Description

Technical Field

[0001] The utility model relates to the technical field of cement preparation, in particular to cement kiln tail incineration equipment suitable for a variety of alternative fuels. Background Art

[0002] Hazardous wastes come from many fields such as life, agriculture, commerce, and industry. They are very diverse and will harm the environment if not properly handled. The high temperature at the end of the cement kiln can incinerate and decompose hazardous wastes. In addition, the perfect tail gas treatment facilities at the end of the cement kiln can also effectively treat the harmful gases produced after incineration to prevent secondary pollution. At the same time, the heat generated by incinerating hazardous wastes can also be used in cement production as an alternative fuel to save the coal consumption required for cement production.

[0003] The current kiln tail alternative fuel incineration equipment has certain technical deficiencies, which are mainly manifested in poor adaptability to different materials, low burnout rate, and frequent maintenance.

[0004] Our company has developed incineration equipment and applied for a patent on July 28, 2021. The patent name is: A kiln tail waste incineration treatment mechanism, announcement number: CN215929566U. The incineration mechanism adopts a stepped incinerator. When the alternative fuel enters the incinerator, compressed air is sprayed from the bottom to stir the hazardous waste. This mode has two disadvantages. First, it is not adaptable to materials with small particle size. Materials with small particle size are easy to accumulate in places where compressed air cannot reach; second, frequent injection of compressed air will cause a large amount of cold air to be mixed into the system, which is not conducive to combustion in the furnace and leads to a low burnout rate. Utility Model Content

[0005] The utility model aims to solve the problems in the above-mentioned background technology and proposes a cement kiln tail incineration device suitable for a variety of alternative fuels.

[0006] The technical solution of the utility model is:

[0007] A cement kiln tail incineration device suitable for multiple alternative fuels comprises an incineration device, a decomposition furnace, a tertiary air duct and a screw feeder; the incineration device comprises a step incinerator and a flap incinerator, the incineration devices are arranged in parallel at several locations, a screw feeder is connected to the inlet of the incineration device, the air inlet of the incineration device is connected to the tertiary air duct through a branch pipe, and the air outlet of the incineration device is connected to the decomposition furnace; a material holding table which is lowered in sequence is provided in the incineration device, and the material holding table is stirred by turning over and / or blowing.

[0008] Furthermore, a plurality of material platforms are arranged at the bottom of the step incinerator, and the material platforms are successively lowered from the air inlet to the air outlet. A plurality of air gun holes A are arranged on the material platforms, and the air gun holes A are connected to the compressed air system; the compressed air system can spray compressed air as needed to sweep the solid waste and hazardous waste in the incineration equipment and stir them in the furnace to prevent the hazardous waste or ash from accumulating on the material platform, and at the same time, the residence time of the solid waste and hazardous waste in the incineration equipment can be controlled by adjustment. Among them, the step incinerator is inclined at a certain angle to the horizontal direction from the air inlet to the air outlet, the air inlet of the step incinerator is arranged at the highest position, and the air outlet of the step incinerator is arranged at the lowest position of the incineration equipment.

[0009] Furthermore, the height difference between each section of the material platform is 200 to 800 mm, and the number of material platforms ranges from 5 to 20; and the number of air gun holes A provided on each section of the material platform is 3 to 5.

[0010] Furthermore, a raw material discharge port is provided below the air inlet of the stepped incinerator; the raw material discharge port is located above the material platform.

[0011] Furthermore, a number of groups of turntables are correspondingly arranged on the shells on both sides of the flap incinerator, and each group of turntables is arranged to be successively lowered in the horizontal direction. A support plate is provided between each group of turntables, and the support plates are in the shape of steps that are successively lowered for holding materials. Each support plate is connected to the corresponding turntable through a hollow steel pipe that also passes through the incineration equipment.

[0012] Furthermore, each group of the turntables is connected to an independent hydraulic cylinder or electric actuator, so that it can rotate independently. The rotation of the turntable causes the support plate to flip up and down and swing, so that the support plate swings at different inclination angles, and the swing range is 0 to 30 degrees.

[0013] Furthermore, a plurality of air gun holes B are provided on each group of the turntables, and the air gun holes B are arranged adjacent to the support plate. A plurality of air gun holes C are also provided at the bottom of the flap incinerator.

[0014] Furthermore, a plurality of temperature and pressure sensors are arranged on the flap incinerator, and observation windows are arranged on both sides of the incineration equipment to facilitate knowing the working conditions inside the equipment.

[0015] Furthermore, a raw material discharge port is provided near the air inlet of the flap incinerator, and the raw material discharge port is located above the portion where the supporting plate is provided.

[0016] Furthermore, the support plate is made of a heat-resistant metal material, and a fire-resistant layer is attached to the surface.

[0017] Furthermore, the air inlet of the incineration equipment is connected to the tertiary air duct of the cement production line through a branch pipe, and a gate valve A is provided on the tertiary air duct, and the gate valve A is arranged at one end near the decomposition furnace. A gate valve B is also provided on the branch pipe, and the gate valve B is arranged at one end near the incineration equipment.

[0018] Furthermore, the air gun hole A, the air gun hole B, and the air gun hole C are respectively connected to a compressed air system, and the compressed air system provides or stops providing compressed air to each air gun hole and adjusts the air volume.

[0019] Beneficial effects of the utility model:

[0020] 1. The utility model can arrange several incineration devices with different material holding tables in parallel, so that materials of different properties or sizes can be allocated to the most suitable incineration device. Materials with smaller particle sizes can enter the flap incinerator, and materials with larger particle sizes can enter the step incinerator. This allocation of materials can greatly reduce the large amount of cold air mixed into the system due to frequent use of air cannons, improve the combustion effect of the system, increase the burnout rate of materials, and prevent materials that have not yet been burned from entering the decomposition furnace.

[0021] 2. The stepped incinerator is equipped with multiple air holes A on the material table, which can effectively stir the garbage fuel to make it burn fully; there is no relative motion mechanism, so the wear is small; there is a refractory material protective layer inside; raw material is sprinkled through the raw material discharge port to prevent the temperature in the incinerator from being too high, all of which are used to ensure the stability of the equipment and reduce downtime for maintenance.

[0022] 3. Several groups of turntables are correspondingly arranged on the shells on both sides of the flap incinerator, and hollow steel pipes are used to penetrate the incineration equipment and the support plate and the corresponding turntable at the same time. The support plate can support the alternative fuel or ash so that it will not accumulate at the bottom of the incinerator. The turntable can be rotated to adjust the inclination of the support plate, so as to adjust the residence time of different materials in the furnace, and then adapt to the combustion conditions of different materials, so that the materials are burned out and the fuel that has not been burned out is prevented from being sent to the decomposition furnace. When the alternative fuel or ash accumulates on the support plate, compressed air can be used to blow them away through the air gun hole B. If the alternative fuel or ash accumulates at the bottom, compressed air can be used to blow them away through the air gun hole C. The above two methods prevent the abnormal accumulation of fuel or ash in the powder screening equipment. The hollow steel pipe runs through the turntable, the pallet and the incinerator. As the turntable and the pallet rotate, cold air from the outside environment circulates in the pipe, and air cooling is achieved through the hollow steel pipe to cool the pallet. A refractory protective layer is provided inside the incineration equipment and on the surface of the pallet. Raw material is sprinkled through the raw material discharge port to prevent the temperature inside the incineration equipment from being too high, all of which are used to ensure the stability of the equipment and reduce downtime for maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the structure of the utility model;

[0024] Figure 2 This is a schematic diagram of the process flow of the utility model;

[0025] Figure 3 This is a schematic diagram of the internal structure of the flap incinerator in the utility model;

[0026] Figure 4 This is a schematic diagram of the internal cross-sectional three-dimensional structure of the flap incinerator in the utility model;

[0027] Figure 5 This is a schematic diagram of the external three-dimensional structure of the flap incinerator in the utility model;

[0028] In the figure:

[0029] 1. Step incinerator 2. Flip-top incinerator 3. Raw material discharge port 4. Alternative fuel imports 5. Compressed air system 6. Gate valve A 7. Gate valve B 8. Tertiary air duct 9. Decomposition furnace 10. Screw feeder 1-1. Material table 1-2. Air gun hole A 2-1. Turntable 2-2. Pallet 2-3. Air gun hole B 2-4. Hollow steel pipe 2-5. Air gun hole C DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0031] Example 1

[0032] A cement kiln tail incineration device suitable for multiple alternative fuels, comprising a step incinerator 1, a flap incinerator 2, a decomposition furnace 9, a tertiary air duct 8 and a screw feeder 10; wherein the step incinerator and the flap incinerator are collectively referred to as an incinerator, wherein the feed ports of the step incinerator 1 and the flap incinerator 2 are respectively connected to the screw feeder 10, the air inlets of the step incinerator 1 and the flap incinerator 2 are respectively connected to the tertiary air duct 8, and the air outlets of the step incinerator 1 and the flap incinerator 2 are respectively connected to the tertiary air duct 8. The ports are respectively connected to the decomposition furnace 9; a plurality of material platforms 1-1 are arranged at the bottom of the stepped incinerator 1, and the material platforms 1-1 are successively lowered from the air inlet to the air outlet, and an air muzzle A1-2 is arranged on the material platform 1-1; a plurality of groups of turntables 2-1 are correspondingly arranged on the shells on both sides of the flap incinerator 2, and each group of turntables 2-1 is successively lowered in the horizontal direction, and a support plate 2-2 is arranged between each group of turntables, and each support plate 2-2 is connected to the turntable through a hollow steel pipe 2-4 that penetrates the incinerator.

[0033] During operation, air with a temperature of about 950°C flows in the tertiary air duct 8, and the entire system operates under negative pressure. Due to the effect of negative pressure, air flows from the tertiary air duct 8 into the decomposition furnace 9;

[0034] After being dried and crushed, the alternative fuel enters different incinerators through several screw feeders 10. The materials with larger particle sizes enter the step incinerator 1, and the materials with smaller particle sizes enter the flap incinerator 2. They meet the high-temperature air from the tertiary air duct 8, are oxidized and burned at high temperature in the incinerator, and the mixed flue gas and heat after combustion enter the decomposition furnace 9. The gas generated is discharged after being treated with the kiln tail gas. The heat generated is used for cement production, and the ash generated is used as the raw material for cement production. If the harmful elements in the ash exceed the allowable limit for cement production, they are led out, cooled and collected through the bypass venting system of the cement production line.

[0035] Since the step incinerator is at a certain angle to the horizontal plane, the solid waste alternative fuel fed by the rotary feeding device 10 naturally falls on the material platform 1-1 built into the step incinerator 1. The material platform 1-1 is arranged from high to low from the inlet to the outlet.

[0036] After the solid waste substitute fuel enters the stepped incinerator 1, the compressed air system 5 is used to spray compressed air into the furnace through the air cannon hole A1-2 to push the material on the material table 1-1 to move to the next material table 1-1. The spraying frequency of the air cannon is adjusted to stir the material in the stepped incinerator 1 to achieve the effect of full combustion and prevent the solid waste substitute fuel from accumulating in the stepped incinerator 1.

[0037] During the combustion of the solid waste alternative fuel in the step incinerator 1, the temperature of the step incinerator 1 will increase. When the temperature is too high, raw material can be added through the raw material feeding port 3 to neutralize the temperature; the raw material feeding port 3 is located above the part of the step incinerator 1 where the material table 1-1 is provided. Raw material is added and the temperature in the step incinerator 1 is neutralized by the temperature of the raw material. At the same time, the step incinerator 1 can also be protected and the service life of the step incinerator 1 can be extended.

[0038] The support plates 2-2 inside the flap incinerator 2 are fixed on the turntables 2-1 on both sides of the equipment. Each group of turntables 2-1 is connected to an independent hydraulic cylinder or electric actuator, so that each group of turntables 2-1 can rotate independently. The support plates 2-2 are placed horizontally at the start of the system. When the turntable 2-1 rotates, the support plates 2-2 swing up and down accordingly, so that each support plate 2-2 can swing at a different inclination angle, and the swing range is 0 to 30 degrees, and the preferred degree is 0 to 5 degrees; the residence time of the alternative fuel in the flap incinerator 2 can be adjusted by the inclination angle of the support plate 2-2, and the swing degree of the support plate can be set according to the properties and particle size of the alternative fuel, so as to adapt to the combustion conditions of different materials, so that the materials are burned out, and avoid being sent into the decomposition furnace 9 before they are completely burned.

[0039] Air gun holes B2-3 are provided on each set of turntables 2-1. The air gun holes B2-3 are arranged near the support plate 2-2. Air gun holes C2-5 are also provided at the bottom of the flap incinerator 2. If the alternative fuel or ash is accumulated in large quantities on the support plate 2-2, compressed air can be used to blow them away through the air gun holes B2-3; if the alternative fuel or ash is accumulated in large quantities at the bottom of the flap incinerator 2, compressed air can be used to blow them away through the air gun holes C2-5.

[0040] The support plate 2-2 is made of heat-resistant metal material, and a refractory layer is attached to its surface; when the temperature in the flap incinerator 2 is high, raw material can be put in through the raw material discharge port 3 to neutralize the temperature.

[0041] Both the step incinerator 1 and the flap incinerator 2 are provided with a refractory layer inside to protect the metal shell and prevent the metal shell from being burned by high temperature;

[0042] The air inlet of the incinerator is connected to the tertiary air duct 8 of the cement production line through a branch pipe. A gate valve A6 is provided on the tertiary air duct 8, and the gate valve A6 is arranged at one end near the decomposition furnace 9. A gate valve B7 is also provided on the branch pipe, and the gate valve B7 is arranged at one end near the incinerator. The amount of air entering the incinerator is controlled by adjusting the gate valve to improve the burnout rate of different alternative fuels during operation.

[0043] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A cement kiln tail incineration equipment suitable for a variety of alternative fuels, characterized by: It includes incineration equipment, a decomposition furnace, a tertiary air duct and a screw feeder; the incineration equipment includes a step incinerator and a flap incinerator, the incineration equipment is arranged in parallel at several locations, the screw feeder is connected to the inlet of the incineration equipment, the air inlet of the incineration equipment is connected to the tertiary air duct through a branch pipe, and the air outlet of the incineration equipment is connected to the decomposition furnace; there is a material holding table that is lowered in sequence in the incineration equipment, and the material holding table is stirred by turning over and / or blowing.

2. The cement kiln tail incineration equipment applicable to multiple alternative fuels according to claim 1, characterized in that: A plurality of material platforms are arranged at the bottom of the step incinerator, and the material platforms are successively lowered from the air inlet to the air outlet, and a plurality of air gun holes A are arranged on the material platforms; wherein, the step incinerator is inclined at a certain angle to the horizontal direction from the air inlet to the air outlet, the air inlet of the step incinerator is arranged at the highest position, and the air outlet of the step incinerator is arranged at the lowest position of the incineration equipment.

3. The cement kiln tail incineration equipment applicable to multiple alternative fuels according to claim 2 is characterized in that: The height difference between each section of the material platform is 200-800 mm, and the number of material platforms ranges from 5 to 20; and the number of air gun holes A provided on each section of the material platform is 3 to 5.

4. The cement kiln tail incineration equipment applicable to multiple alternative fuels according to claim 2 is characterized in that: A raw material discharge port is provided below the air inlet of the stepped incinerator; the raw material discharge port is located above the material platform.

5. The cement kiln tail incineration equipment applicable to multiple alternative fuels according to claim 1, characterized in that: Several groups of turntables are correspondingly arranged on the shells on both sides of the flap incinerator. Each group of turntables is arranged to be lowered in sequence in the horizontal direction. A support plate is arranged between each group of turntables. The support plates are in the shape of steps that are lowered in sequence and are used to hold materials. Each support plate is connected to the corresponding turntable through a hollow steel pipe that also passes through the incineration equipment.

6. The cement kiln tail incineration equipment applicable to multiple alternative fuels according to claim 5, characterized in that: Each group of the turntables is connected to an independent hydraulic cylinder or electric actuator, so that the support plate can swing at different inclination angles, and the swing range is 0 to 30 degrees.

7. The cement kiln tail incineration equipment applicable to multiple alternative fuels according to claim 5, characterized in that: A plurality of air gun holes B are arranged on each group of the rotating disks. The air gun holes B are arranged adjacent to the supporting plate. A plurality of air gun holes C are also arranged at the bottom of the flap incinerator.

8. The cement kiln tail incineration equipment applicable to multiple alternative fuels according to claim 7, characterized in that: A plurality of temperature and pressure sensors are arranged on the flap incinerator, and observation windows are arranged on both sides of the incineration equipment.

9. The cement kiln tail incineration equipment applicable to multiple alternative fuels according to claim 8, characterized in that: A raw material discharge port is arranged near the air inlet of the flap incinerator, and the raw material discharge port is located above the portion where the supporting plate is arranged.

10. The cement kiln tail incineration equipment applicable to multiple alternative fuels according to claim 7, characterized in that: The support plate is made of heat-resistant metal material, and a fire-resistant layer is attached to the surface.

11. A cement kiln tail incineration device suitable for multiple alternative fuels according to any one of claims 1 to 10, characterized in that: The air inlet of the incineration equipment is connected to the tertiary air duct of the cement production line through a branch pipe. A gate valve A is provided on the tertiary air duct, and the gate valve A is arranged at one end near the decomposition furnace. A gate valve B is also provided on the branch pipe, and the gate valve B is arranged at one end near the incineration equipment.

12. The cement kiln tail incineration equipment applicable to multiple alternative fuels according to claim 2 or 7, characterized in that: The incineration equipment is also connected to a compressed air system, which is respectively connected to the corresponding air gun hole A, air gun hole B or air gun hole C. The compressed air system provides or stops providing compressed air to each air gun hole and adjusts the air volume.

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