Alternative fuel feeding device

Abstract

The invention relates to the technical field of alternative fuels, and particularly discloses an alternative fuel feeding device which comprises a supporting frame, a buffering stock bin is connected to the upper portion in the supporting frame, a stepped combustion furnace is arranged at the position, below the buffering stock bin, in the supporting frame, and a large-dip-angle belt conveyor is arranged on one side of the supporting frame. A chain scraper conveyor is arranged at the bottom end, away from the supporting frame, of the large-dip-angle belt conveyor. The stepped combustion furnace is arranged and connected through an existing row of tertiary air pipes, so that alternative fuel is completely combusted in the newly-added stepped fuel furnace, heat enters the decomposing furnace along with tertiary air, the alternative fuel does not need to be directly combusted in the decomposing furnace, and the problems that due to the fact that the alternative fuel is various in variety and complex in component, the energy consumption is low and the like are solved. The problem of fluctuation influence on kiln conditions caused by uneven temperature due to feeding and stability of the feeding is solved, and the problem of control over enrichment of harmful elements such as chlorine and sulfur in a preheater system in the using process is solved.

Description

Technical Field

[0001] This invention relates to the field of alternative fuel technology, and in particular to an alternative fuel feeding device. Background Technology

[0002] The use of alternative fuels in cement kilns saves on raw coal consumption and improves cement production efficiency. Objectively, it reduces overall emissions of pollutants and greenhouse gases, fully demonstrating the important role of the cement industry in the circular economy. The cement industry is highly resource- and energy-dependent; its primary challenges are energy conservation, emission reduction, environmental protection, and the rational utilization of resources. Using alternative fuels derived from combustible waste in cement kilns reduces environmental damage and significantly alleviates the environmental burden on society. These alternative fuels can include typical solid wastes such as waste textiles, waste plastics, SRF solid fuels, biomass fuels, and industrial waste with high calorific value.

[0003] If alternative fuels are directly added to the decomposition furnace for combustion, the cement kiln will face challenges due to the variety of alternative fuels and their varying adaptability to different calorific values, moisture contents, and forms. When burning alternative fuels with high moisture content, the rapid evaporation of large amounts of water under high temperature conditions will cause significant temperature fluctuations within the decomposition furnace. This will affect the operation of the rotary kiln, clinker output, and quality after the material enters the system. If the material's residence time in the decomposition furnace is too short, it will not burn completely and will have a low burnout rate, resulting in clinker with a core or yellow core, which will affect the quality of the clinker. Unburned material will continue to burn in the rotary kiln, affecting the material movement rate and increasing the kiln current. During use, this will also cause problems in controlling the enrichment of harmful elements such as chlorine and sulfur in the preheater system. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing an alternative fuel feeding device.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] An alternative fuel feeding device includes a support frame, with a buffer hopper connected to the upper part of the support frame. A stepped combustion furnace is located inside the support frame below the buffer hopper. A steeply inclined conveyor belt is located on one side of the support frame, and a chain conveyor is located at the bottom end of the steeply inclined conveyor belt away from the support frame.

[0007] Preferably, the bottom discharge end of the buffer hopper is connected to an electric bidirectional airlock valve, and a shaftless screw feeder is provided at the bottom of the electric bidirectional airlock valve. The shaftless screw feeder is connected to the stepped combustion furnace.

[0008] Preferably, the bottom of the electric bidirectional airlock valve is provided with a first connection port, the end of the first connection port away from the electric bidirectional airlock valve is connected to the input end of the shaftless screw feeder, and the bottom of the shaftless screw feeder is provided with a second connection port, the end of the second connection port away from the shaftless screw feeder is connected to the input end of the stepped combustion furnace.

[0009] Preferably, the output end of the steep-angle conveyor belt is located above the top of the buffer hopper, the chain conveyor is located above the bottom end of the steep-angle conveyor belt away from the support frame, and a feed hopper is provided above the top of the end of the chain conveyor away from the steep-angle conveyor belt.

[0010] Preferably, the stepped combustion furnace has a discharge port at the end away from the inclined conveyor belt, and multiple stepped plates are evenly arranged on the inner wall of the stepped combustion furnace.

[0011] Preferably, multiple air nozzles are evenly embedded and installed on the side of the stepped plate away from the discharge port, and the air nozzles are made of high-temperature resistant material.

[0012] Preferably, the bottom of the stepped combustion furnace is connected to a tertiary air duct, and the output end of the tertiary air duct is connected to the interior of the stepped combustion furnace.

[0013] Preferably, the top of the inclined conveyor belt is provided with a feed inlet, and the output end of the chain conveyor is located above the feed inlet.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] This invention incorporates a stepped combustion furnace, which is connected to an existing tertiary air duct. This allows the alternative fuel to be completely combusted in the newly added stepped fuel furnace, with the heat entering the decomposition furnace with the tertiary air. This eliminates the need for the alternative fuel to be directly combusted in the decomposition furnace, thus solving the problem of fluctuating kiln conditions caused by uneven temperature due to the variety and complex composition of alternative fuels and the instability of the feedstock. It also addresses the problem of controlling the accumulation of harmful elements such as chlorine and sulfur in the preheater system during use.

[0016] By setting up stepped plates, when alternative fuels enter the stepped combustion furnace, they first stay on the top stepped plate and are burned under the action of high-temperature tertiary air. After combustion, the ash formed by the alternative fuel combustion is fully suspended and flowed under the action of air nozzles, and then enters the decomposition furnace with the tertiary air. The use of stepped plates and air nozzles inside the stepped combustion furnace ensures that the alternative fuels can be rolled and calcined on the stepped plates, so that the alternative fuels can be completely burned and calcined in the largest possible quantity of different types of alternative fuels. Attached Figure Description

[0017] Figure 1This is a schematic diagram of the overall structure of the present invention;

[0018] Figure 2 For the present invention Figure 1 Enlarged structural diagram at point A in the middle;

[0019] Figure 3 This is a schematic diagram of the connection structure between the buffer silo and the stepped combustion furnace of the present invention;

[0020] Figure 4 This is a schematic cross-sectional view of the stepped combustion furnace of the present invention;

[0021] Figure 5 For the present invention Figure 4 Enlarged structural diagram at point B;

[0022] Figure 6 This is a schematic diagram of the overall process flow structure of the present invention.

[0023] In the diagram: 1. Support frame; 2. Buffer hopper; 3. Inclined belt conveyor; 4. Chain conveyor; 5. Feed hopper; 6. Feed inlet; 7. Electric bidirectional airlock valve; 8. Shaftless screw feeder; 9. First connection port; 10. Second connection port; 11. Discharge port; 12. Tertiary air duct; 13. Stepped plate; 14. Air nozzle; 15. Stepped combustion furnace. Detailed Implementation

[0024] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0025] Reference Figure 1-6 An alternative fuel feeding device includes a support frame 1, with a buffer hopper 2 connected to the upper part of the support frame 1. A stepped combustion furnace 15 is located below the buffer hopper 2 inside the support frame 1. A steep-angle conveyor belt 3 is located on one side of the support frame 1, and a chain conveyor 4 is located at the bottom end of the steep-angle conveyor belt 3 away from the support frame 1. The stepped combustion furnace 15 provides combustion space for the alternative fuel. By connecting the stepped combustion furnace 15 to a decomposition furnace, the heat and suspended solids generated by the combustion of the alternative fuel can be transferred into the decomposition furnace for use. The steep-angle conveyor belt 3 and the chain conveyor 4 transport the alternative fuel, and the buffer hopper 2 stores the alternative fuel, ensuring that the alternative fuel continuously and evenly falls into the stepped combustion furnace 15 for use.

[0026] As a technical optimization of the present invention, the bottom discharge end of the buffer silo 2 is connected to an electric bidirectional airlock valve 7, and a shaftless screw feeder 8 is provided at the bottom of the electric bidirectional airlock valve 7. The shaftless screw feeder 8 is connected to the stepped combustion furnace 15. The shaftless screw feeder 8 can realize the stable delivery of alternative fuel to the stepped combustion furnace 15, thereby ensuring the feeding stability of alternative fuel. The electric bidirectional airlock valve 7 can lock the air to maintain negative pressure and prevent backfire. The quantitative feeding can also be reversed and cleared with one key.

[0027] As a technical optimization of the present invention, the bottom of the electric bidirectional airlock valve 7 is provided with a first connection port 9. The end of the first connection port 9 away from the electric bidirectional airlock valve 7 is connected to the input end of the shaftless screw feeder 8. The bottom of the shaftless screw feeder 8 is provided with a second connection port 10. The end of the second connection port 10 away from the shaftless screw feeder 8 is connected to the input end of the stepped combustion furnace 15. The alternative fuel is conveyed to the interior of the shaftless screw feeder 8 through the first connection port 9, and the alternative fuel is conveyed to the interior of the stepped combustion furnace 15 through the second connection port 10.

[0028] As a technical optimization of the present invention, the output end of the steep-angle conveyor belt 3 is located above the top of the buffer hopper 2, and the chain conveyor 4 is located above the bottom end of the steep-angle conveyor belt 3 away from the support frame 1. A feed hopper 5 is provided above the top of the end of the chain conveyor 4 away from the steep-angle conveyor belt 3. Alternative fuel is added into the feed hopper 5, which can evenly distribute the alternative fuel onto the chain conveyor 4.

[0029] As a technical optimization of the present invention, the stepped combustion furnace 15 is provided with a discharge port 11 at one end away from the large-angle conveyor belt 3, and a plurality of stepped plates 13 are evenly arranged on the inner wall of the stepped combustion furnace 15.

[0030] Multiple air nozzles 14 are evenly embedded on the side of the stepped plate 13 away from the discharge port 11. The air nozzles 14 are made of high temperature resistant material.

[0031] The bottom of the stepped combustion furnace 15 is connected to a tertiary air duct 12, and the output end of the tertiary air duct 12 is connected to the interior of the stepped combustion furnace 15. The use of the stepped plate 13 and air nozzle 14 inside the stepped combustion furnace 15 ensures that the alternative fuel can be rolled and calcined on the stepped plate 13, so that the alternative fuel can be completely burned and the maximum amount of different types of alternative fuel can be calcined. By blowing high-temperature tertiary air into the stepped combustion furnace 15, the heat after the alternative fuel is completely burned in the stepped combustion furnace 15 is carried by the tertiary air into the decomposition furnace through the discharge port 11.

[0032] As a technical optimization of the present invention, the top of the inclined conveyor belt 3 is provided with a feed inlet 6, and the output end of the chain conveyor 4 is located above the feed inlet 6. The alternative fuel on the chain conveyor 4 can be fed into the inclined conveyor belt 3 by falling into the feed inlet 6, so that the inclined conveyor belt 3 can complete the transportation of alternative fuel.

[0033] In use, all electrical equipment in this device is powered by an external power source connected via wires. The device is controlled by a pre-set control system. When the device is put into operation, a closed workshop is constructed at the bottom outer position of the chain conveyor 4 and the steep-angle conveyor belt 3. This workshop serves as an intermediate warehouse. The steep-angle conveyor belt 3 features a fully sealed outer design. This sealed design not only solves the problems of dust pollution and material waste associated with traditional conveyors but also significantly improves the environmental friendliness, stability, and economy of the equipment. The electric bidirectional airlock valve 7 and the shaftless screw feeder 8 used in this device are both existing mature technologies. Therefore, it will not be elaborated further. The support frame 1 has an air cannon body pre-installed on the outside of the stepped combustion furnace 15. The air cannon body is connected to the air nozzle 14. The air cannon body and the connection method between the air cannon body and the air nozzle 14 are all existing mature technologies, so they will not be elaborated further. The tertiary air duct 12 and the connection of the tertiary air duct 12 are all existing mature technologies, so they will not be elaborated further. Furthermore, the discharge port 11 on the stepped combustion furnace 15 is connected to the pre-installed decomposition furnace outside the device through a short pipe and expansion joint. The decomposition furnace and the connection method between the stepped combustion furnace 15 and the decomposition furnace are all existing mature technologies, so they will not be elaborated further.

[0034] The operating procedure of this device is as follows: First, the processed alternative fuel in the alternative fuel warehouse is transported to the intermediate silo and added into the feed hopper 5. The alternative fuel in the feed hopper 5 falls onto the chain conveyor 4. After being conveyed by the chain conveyor 4, the alternative fuel enters the inclined conveyor belt 3 through the feed port 6. The alternative fuel is then conveyed to the buffer silo 2 through the inclined conveyor belt 3. The alternative fuel in the buffer silo 2 is then conveyed to the shaftless screw feeder 8 through the electric bidirectional air lock valve 7. The shaftless screw feeder 8 distributes the alternative fuel into the interior of the stepped combustion furnace 15. At this time, high-temperature tertiary air is injected into the interior of the stepped combustion furnace 15 through the tertiary air pipe 12. The stepped combustion furnace 15 provides combustion space for the alternative fuel. The high-temperature tertiary air provides the oxygen and heat required for the combustion of the alternative fuel. Furthermore, by blowing high-temperature tertiary air into the stepped combustion furnace 15, the heat from the complete combustion of the alternative fuel in the stepped combustion furnace 15 is carried by the tertiary air through the discharge port 11 into the decomposition furnace.

[0035] When the alternative fuel enters the stepped combustion furnace 15, it first stays on the top stepped plate 13 and is burned under the action of high-temperature tertiary air. After combustion, the ash formed after the alternative fuel is burned is fully suspended and flowed by the air nozzle 14 and enters the decomposition furnace with the tertiary air. The use of the stepped plate 13 and the air nozzle 14 inside the stepped combustion furnace 15 ensures that the alternative fuel can be rolled and calcined on the stepped plate 13, so that the alternative fuel can be completely burned and the maximum amount of different types of alternative fuel can be calcined.

[0036] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An alternative fuel feeding device, comprising a support frame (1), characterized in that, The support frame (1) is connected to a buffer hopper (2) at the top inside. A stepped combustion furnace (15) is provided inside the support frame (1) below the buffer hopper (2). A large-angle conveyor belt (3) is provided on one side of the support frame (1). A chain conveyor (4) is provided at the bottom of the large-angle conveyor belt (3) away from the support frame (1).

2. The alternative fuel feeding device according to claim 1, characterized in that, The bottom discharge end of the buffer silo (2) is connected to an electric bidirectional airlock valve (7), and the bottom of the electric bidirectional airlock valve (7) is equipped with a shaftless screw feeder (8), which is connected to the stepped combustion furnace (15).

3. The alternative fuel feeding device according to claim 2, characterized in that, The bottom of the electric bidirectional airlock valve (7) is provided with a first connection port (9). The end of the first connection port (9) away from the electric bidirectional airlock valve (7) is connected to the input end of the shaftless screw feeder (8). The bottom of the shaftless screw feeder (8) is provided with a second connection port (10). The end of the second connection port (10) away from the shaftless screw feeder (8) is connected to the input end of the stepped combustion furnace (15).

4. The alternative fuel feeding device according to claim 1, characterized in that, The output end of the steep angle conveyor belt (3) is located above the top of the buffer hopper (2), and the chain plate conveyor (4) is located above the bottom end of the steep angle conveyor belt (3) away from the support frame (1). The top of the chain plate conveyor (4) away from the steep angle conveyor belt (3) is provided with a feed hopper (5).

5. The alternative fuel feeding device according to claim 1, characterized in that, The stepped combustion furnace (15) has a discharge port (11) at the end away from the inclined conveyor belt (3), and multiple stepped plates (13) are evenly arranged on the inner wall of the stepped combustion furnace (15).

6. The alternative fuel feeding device according to claim 5, characterized in that, Multiple air nozzles (14) are evenly embedded on the side of the stepped plate (13) away from the discharge port (11), and the air nozzles (14) are made of high temperature resistant material.

7. The alternative fuel feeding device according to claim 1, characterized in that, The bottom of the stepped combustion furnace (15) is connected to a tertiary air duct (12), and the output end of the tertiary air duct (12) is connected to the interior of the stepped combustion furnace (15).

8. The alternative fuel feeding device according to claim 1, characterized in that, The top of the inclined conveyor belt (3) is provided with a feed inlet (6), and the output end of the chain plate conveyor (4) is located above the feed inlet (6).

Images