A multi-point feeding system for alternative fuels in cement kilns

Abstract

The utility model discloses a kind of multi-point feeding system of alternative fuel for cement kiln, it includes: metering and weighing bin, which is by conveying equipment to carry out material supply;Double discharge metering screw conveying equipment, it is set below metering and weighing bin, two spaced apart discharge mechanisms are provided in the double discharge metering screw conveying equipment, and it is conveyed to different feeding point;Rotary discharging device, it is provided with two, and is respectively set at the discharge port of two discharge mechanisms;Decomposition furnace, its side portion is fixedly connected by denitration pipeline.The utility model device, using double discharge metering conveying screw realizes the multi-point feeding of alternative fuel for cement kiln, improves the use amount of alternative fuel, adjusts feeding amount by feeding amount measurement feedback, reduces the influence to cement kiln itself kiln condition, while temperature monitoring system and automatic spraying system ensure the safety of feeding process.

Description

Technical Field

[0001] This utility model specifically relates to the field of feeding systems, and more specifically to a multi-point feeding system for alternative fuels in cement kilns. Background Technology

[0002] With the rapid development of society, economy, and urbanization, in order to improve the urban environment and appearance, and to conserve energy, reduce carbon emissions, and fully utilize the potential of urban alternative fuels and other combustible waste, the following two effective technological approaches have emerged:

[0003] 1. Power generation using alternative fuels, utilizing them for both electricity and heat supply;

[0004] 2. Utilize cement kilns.

[0005] However, alternative fuel power generation has low efficiency in heat utilization and causes secondary pollution and disturbance to residents; in contrast, utilizing cement kilns has many unique advantages and has therefore developed rapidly.

[0006] However, traditional cement kilns using alternative fuel feeding systems are mostly single-point feeding systems, typically with the feeding point being the precalciner. This results in low alternative fuel consumption and a significant impact on kiln conditions. To address the issues of system feeding stability and quantity, this invention proposes a safe and stable multi-point feeding system for alternative fuels in cement kilns to solve these problems. Utility Model Content

[0007] To achieve the above objectives, this utility model provides the following technical solution: a multi-point feeding system for alternative fuels in cement kilns, comprising:

[0008] The weighing bin is supplied with materials by conveying equipment.

[0009] A dual-discharge metering screw conveyor is installed below the metering and weighing bin. The dual-discharge metering screw conveyor has two spaced-apart discharge mechanisms that transport materials to different feeding points.

[0010] Two rotary feeding devices are provided, each located at the discharge port of one of the two discharge mechanisms;

[0011] The decomposition furnace is fixedly connected to the side by a denitrification pipe;

[0012] And there are two feeding chutes, which are respectively connected to the side of the decomposition furnace and the denitrification pipe. The top ends of the two feeding chutes are respectively connected to the feeding ports of the two rotary feeding devices.

[0013] Each of the feeding chutes is equipped with a pneumatic gate valve at its top end.

[0014] Optionally, an air cannon is connected to the bottom end of each of the feeding chutes.

[0015] Optionally, a negative pressure gauge is provided on the feed chute and between the pneumatic gate valve and the air cannon.

[0016] Optionally, a pneumatic gate valve is connected and installed at the loading port of the rotary feeding device.

[0017] Optionally, a temperature sensor is provided at the discharge port of the rotary feeding device.

[0018] Optionally, a water mist nozzle controlled by an automatic spraying system is installed above the dual-discharge metering screw conveyor, and the automatic spraying system is connected to a temperature sensor signal.

[0019] Optionally, a weighing sensor is installed inside the weighing chamber.

[0020] Optionally, a pneumatic gate valve is installed at the discharge port of the weighing bin.

[0021] Optionally, the feeding point on the side of the decomposition furnace is at least 2m above its constricted section, and the inclination angle of the discharge chute is not less than 60°.

[0022] The present invention adopts the above technology and has the following beneficial effects compared with the existing technology: In the device of the present invention, the use of a double discharge port metering conveying screw realizes multi-point feeding of alternative fuel for cement kiln, which increases the amount of alternative fuel used. The feeding amount is adjusted by the feeding amount metering feedback, which reduces the impact on the condition of the cement kiln itself. At the same time, the temperature monitoring system and the automatic spraying system ensure the safety of the feeding process.

[0023] In addition, this utility model integrates automated equipment, reducing the workload of manual production, and also sets up a double-layer gate valve and a spray system to ensure safety during the production process. Attached Figure Description

[0024] Figure 1 A three-dimensional structural diagram of a multi-point feeding system for alternative fuels in cement kilns;

[0025] Figure 2 for Figure 1 A partial schematic diagram of a medium-decomposition furnace.

[0026] In the diagram: 1. Metering and weighing bin; 2. Pneumatic gate valve one; 3. Double discharge metering screw conveyor; 4. Pneumatic gate valve two; 5. Rotary feeding device; 6. Pneumatic gate valve three; 7. Negative pressure gauge; 8. Air cannon; 9. Feed chute; 10. Denitrification pipeline; 11. Decomposition furnace; 12. Temperature sensor; 13. Water mist nozzle. Detailed Implementation

[0027] With reference to the accompanying drawings of the embodiments of this utility model, the technical solutions of the embodiments of this utility model will be clearly and completely described below.

[0028] Example: Please refer to the appendix. Figure 1 and 2 This utility model provides a technical solution: a multi-point feeding system for alternative fuels in cement kilns, comprising:

[0029] The weighing bin 1 is supplied with materials by conveying equipment;

[0030] The dual-discharge metering screw conveyor 3 is located below the metering and weighing bin 1. The dual-discharge metering screw conveyor 3 has two spaced-apart discharge mechanisms that convey materials to different feeding points.

[0031] Two rotary feeding devices 5 are provided, and they are respectively located at the discharge ports of the two discharge mechanisms;

[0032] The decomposition furnace 11 is fixedly connected to the denitrification pipe 10 on its side;

[0033] And there are two feeding chutes 9, which are respectively connected to the side of the decomposition furnace 11 and the denitrification pipe 10. The top ends of the two feeding chutes 9 are respectively connected to the feeding ports of the two rotary feeding devices 5.

[0034] Each of the feeding chute 9 is equipped with a pneumatic gate valve 6 at the top, which can be closed during maintenance to provide protection.

[0035] It should be added that the motor of the dual-discharge metering screw conveyor 3 is a variable frequency motor, and a weighing sensor is installed at the screw outlet. It can adjust the speed of the reamer through metering feedback to achieve 0~100% adjustment of the feeding amount.

[0036] In this embodiment, an air cannon 8 is connected to the bottom end of each feeding chute 9.

[0037] In this embodiment, a negative pressure gauge 7 is installed on the feed chute 9 and between the pneumatic gate valve 6 and the air cannon 8. The gate valve can be closed according to the pressure, which can protect the system from backfire.

[0038] In this embodiment, a pneumatic gate valve 4 is connected and installed at the loading port of the rotary feeding device 5.

[0039] In this embodiment, a temperature sensor 12 is provided at the discharge port of the rotary feeding device 5.

[0040] In this embodiment, a water mist nozzle 13 controlled by an automatic spraying system is provided above the dual-discharge metering screw conveyor 3, and the automatic spraying system is connected to the temperature sensor 12.

[0041] It should be noted that the temperature sensor 12 can monitor the temperature of the feed pipe. If the temperature exceeds the set value, there may be a risk of fire. At this time, the solenoid valve of the automatic spray system can be opened by the control system, and water can be sprayed onto the double discharge metering screw conveyor 3 through the water mist nozzle 13 to cool it down.

[0042] Additionally, it should be noted that the number of nozzles and temperature sensors can be set differently depending on the dual-discharge metering screw conveyor 3.

[0043] In this embodiment, a weighing sensor is installed inside the weighing chamber 1.

[0044] In this embodiment, a pneumatic gate valve 2 is installed at the discharge port of the weighing bin 1.

[0045] In this embodiment, the feeding point on the side of the decomposition furnace is at least 2m above its constriction point, and the inclination angle of the discharge chute 9 is not less than 60°, which can avoid material blockage caused by local eddies.

[0046] In practice, alternative fuel is transported from the upstream conveying equipment into the metering and weighing bin 1. This small bin can store a portion of the material. The metering and weighing bin is equipped with a weighing sensor, which will automatically send a signal to the control system to control the amount of material coming in and prevent the small bin from becoming full.

[0047] The material in the weighing and metering bin is conveyed to different feeding points through the two discharge ports of the double discharge metering screw conveyor 3 below. The two feeding paths are equipped with rotary feeding devices, which can play the role of airlocking and stable feeding.

[0048] In addition, air cannons on their respective chutes, which spray at fixed intervals, can prevent material blockage.

[0049] The above-described embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A multi-point feeding system for alternative fuels in cement kilns, characterized in that, It includes: The weighing bin (1) is supplied with materials by conveying equipment; A dual-discharge metering screw conveyor (3) is installed below the metering and weighing bin (1). The dual-discharge metering screw conveyor (3) has two spaced-apart discharge mechanisms that convey materials to different feeding points. Two rotary feeding devices (5) are provided, and they are respectively located at the discharge ports of the two discharge mechanisms; The decomposition furnace (11) is fixedly connected to the denitrification pipe (10) on its side. And feeding chutes (9), there are two of them, which are respectively connected to the side of the decomposition furnace (11) and the denitrification pipe (10). The top ends of the two feeding chutes (9) are respectively connected to the feeding ports of the two rotary feeding devices (5). Each of the feeding chute (9) is equipped with a pneumatic gate valve (6) at its top end.

2. The multi-point feeding system for alternative fuel in cement kilns according to claim 1, characterized in that: Each of the feeding chutes (9) is connected to an air cannon (8) at its bottom end.

3. A multi-point feeding system for alternative fuel in cement kilns according to claim 2, characterized in that: A negative pressure gauge (7) is installed on the feed chute (9) and between the pneumatic gate valve (6) and the air cannon (8).

4. A multi-point feeding system for alternative fuel in cement kilns according to claim 1, characterized in that: The rotary feeding device (5) is connected to a pneumatic gate valve (4) at its feeding port.

5. A multi-point feeding system for alternative fuel in cement kilns according to claim 1, characterized in that: A temperature sensor (12) is installed at the discharge port of the rotary feeding device (5).

6. A multi-point feeding system for alternative fuel in a cement kiln according to claim 5, characterized in that: The dual-discharge metering screw conveyor (3) is equipped with a water mist nozzle (13) controlled by an automatic spraying system, and the automatic spraying system is connected to a temperature sensor (12).

7. A multi-point feeding system for alternative fuel in cement kilns according to claim 1, characterized in that: The weighing chamber (1) is equipped with a weighing sensor.

8. A multi-point feeding system for alternative fuel in cement kilns according to claim 1, characterized in that: A pneumatic gate valve (2) is installed at the discharge port of the weighing bin (1).

9. A multi-point feeding system for alternative fuel in cement kilns according to claim 1, characterized in that: The feeding point on the side of the decomposition furnace (11) is at least 2m above its constricted section, and the inclination angle of the discharge chute (9) is not less than 60°.

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