Fuel screening, premixing and combustion strengthening device

Abstract

The invention relates to the technical field of fuel screening devices, and discloses a fuel screening, premixing and combustion strengthening device which comprises a conveying belt, the conveying belt is installed on a support through two rollers, and one end of the conveying belt is used for receiving fuel particles; the mesh core screen is arranged on the conveying belt, a plurality of screening holes are formed in the mesh core screen, and the conveying belt screens fuel particles through the screening holes; the preheating part is arranged above the conveying belt, a preheating cavity is formed between the preheating part and the conveying belt and used for preheating the fuel particles on the conveying belt, and the preheating part is communicated with external hot waste gas; and the collecting piece is arranged below the conveying belt and used for collecting the fuel particles screened by the conveying belt. The effect of improving the fuel utilization rate through fine screening is achieved, it is avoided that too much small-particle fuel influences mineral melting, sintered solid fuel is fully dried and preheated, and the temperature fluctuation and incomplete combustion phenomena occurring in the combustion process are reduced.

Description

Technical Field

[0001] The invention relates to the technical field of fuel screening devices, in particular to a fuel screening premixing combustion enhancement device. Background Art

[0002] With the intensification of global climate change issues and the promotion of carbon peak and carbon neutrality goals, pollution reduction and carbon reduction have become key tasks to promote high-quality economic development and achieve green and low-carbon transformation. In this context, the requirements of sintering technology for pollution reduction and carbon reduction are becoming increasingly stringent. In sintering production, more than 80% of the heat comes from the combustion of solid fuels. Its combustion characteristics have a huge impact on the output and quality indicators of sintered ore. After a large number of experiments and actual production experience, it is known that particle size is one of the important factors affecting fuel combustion. The most suitable particle size in sintering production is 1-3mm. The traditional sintering mixing method is to evenly mix all the raw materials for sintering in proportion to complete granulation, but the spatial distribution of fuels of different particle sizes is uncontrolled after granulation, which will lead to local overburning and local heat shortage. After the solid fuel is crushed by the existing four-roller crusher, the uniformity of the raw material particle size can be improved to a certain extent, but it cannot achieve more fine screening, especially it cannot screen out too fine solid fuel, which leads to the problem of too much fine particle size fuel, affecting the quality of sintered ore and solid fuel consumption.

[0003] Therefore, there is an urgent need for a fuel screening premixed combustion enhancement device to solve the above problems. Summary of the invention

[0004] The purpose of the present invention is to provide a fuel screening premixed combustion enhancement device to solve the problems existing in the above-mentioned prior art.

[0005] To achieve the above object, the present invention provides the following solution: The present invention provides a fuel screening premixed combustion enhancement device, comprising:

[0006] A conveyor belt is mounted on the bracket via two rollers, one end of the conveyor belt being used to receive fuel particles;

[0007] A mesh core screen is arranged on the conveyor belt, and a plurality of screening holes are opened on the mesh core screen. The conveyor belt screens the fuel particles through the plurality of screening holes;

[0008] A preheating element is arranged above the conveyor belt, a preheating chamber is formed between the preheating element and the conveyor belt, and is used to preheat the fuel particles on the conveyor belt, and the preheating element is connected to the external hot exhaust gas;

[0009] The collecting member is arranged below the conveyor belt and is used for collecting the fuel particles screened by the conveyor belt.

[0010] According to a fuel screening premixing combustion enhancement device provided by the present invention, the preheating part includes a preheating pipe, two baffles are respectively arranged on both sides between the preheating pipe and the conveyor belt, the preheating chamber is formed between the preheating pipe, the conveyor belt and the two baffles, and a heat medium inlet and a heat medium outlet are respectively opened at both ends of the preheating pipe, and the heat medium inlet is connected to the external hot exhaust gas.

[0011] According to a fuel screening premixed combustion enhancement device provided by the present invention, a plurality of fins are fixedly connected to the bottom end of the preheating pipe along the axial direction.

[0012] According to a fuel screening premixed combustion enhancement device provided by the present invention, the collecting component includes a fuel buffer tank located below the conveyor belt, and the fuel buffer tank is connected to the conveyor belt through a plurality of rollers.

[0013] According to the present invention, a fuel screening premixed combustion enhancement device also includes a sintered fuel bin and a fine-particle fuel bin. The sintered fuel bin is used to receive the fuel particles on the conveyor belt, and the fine-particle fuel bin is used to receive the fuel particles in the fuel buffer tank.

[0014] A fuel screening premixed combustion enhancement device provided according to the present invention also includes a tensioner, and the tensioner is installed on the conveyor belt.

[0015] A fuel screening premixed combustion enhancement device provided according to the present invention also includes a vibration motor, and the vibration motor is installed on the conveyor belt.

[0016] According to a fuel screening premixing combustion enhancement device provided by the present invention, the conveyor belt is arranged at an inclination with the ground, and the inclination angle is not greater than 30°, and the preheating pipe and the fuel buffer tank are arranged parallel to the conveyor belt.

[0017] According to a fuel screening premixed combustion enhancement device provided by the present invention, the aperture of the screening holes is mm.

[0018] According to a fuel screening premixing combustion enhancement device provided by the present invention, the temperature in the preheating chamber is 200°C-500°C.

[0019] Compared with the prior art, the present invention has the following advantages and technical effects:

[0020] The present invention provides a fuel screening premixing combustion enhancement device. The fuel is crushed by four rollers and then transported to a conveyor belt. When moving on the conveyor belt, the fuel particles are screened by a provided mesh screen. The screened small particles fall into the collecting part below. The particles on the conveyor belt are preheated by a provided preheating part to improve the combustion conditions of the fuel, thereby reducing the solid fuel consumption during the sintering process, improving the quality of the sintered ore, and transporting it to the fuel bin for combustion. The present invention avoids excessive small particle fuel and avoids the reduction of high temperature holding time due to too fast combustion speed, which affects the melting of minerals. By utilizing the waste heat of waste heat gas, the sintered solid fuel can be fully dried and preheated, making it easier to reach the ignition point and the temperature uniform, reducing the temperature fluctuation and incomplete combustion phenomenon during the combustion process; through fine screening, the fuel utilization effect is improved, and at the same time, the transmission and screening are coupled and integrated to save floor space, effectively reduce costs, and improve the workshop environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative labor:

[0022] Figure 1 This is a structural diagram of Embodiment 1 of the present invention;

[0023] Figure 2 This is a structural diagram of Embodiment 2 of the present invention;

[0024] Among them, 1. conveyor belt; 2. roller; 3. mesh screen; 4. preheating pipe; 5. heat medium inlet; 6. heat medium outlet; 7. baffle; 8. rib; 9. fuel buffer tank; 10. roller; 11. sintering fuel bin; 12. fine particle size fuel bin; 13. tensioner; 14. vibration motor; 15. support frame; 16. rotating roller; 17. protrusion; 18. collecting tank; 19. grille. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] In the related art, CN116336791B discloses a sintering fuel screening system and screening process, which can produce and prepare sintering fuel according to the set particle size requirements, solve the problem that the fuel particle size is too fine and affects the quality of the sintered ore product and the energy utilization efficiency, improve the sintered ore yield, and reduce the solid fuel consumption in the sintering process. However, the equipment has a complex pipeline structure.

[0028] CN116803536A discloses a fuel pre-screening and pre-batching process and equipment. The invention proposes two technical solutions: one is to screen out the fine particles in the fuel in advance through the pre-screening process, reduce the load of the crusher in the next process, reduce excessive fuel crushing, and avoid excessive fuel particle size; the second is to propose a fuel pre-batching process, which mixes fuels of different particle sizes and even different types to obtain a mixed fuel, which has the effect of reducing fuel consumption, improving sintering uniformity, and increasing the return rate. However, this technical solution requires the configuration of multiple screening machines and fuel bins, and the reduction effect on the 0-0.5mm particle size is only reduced by an average of 1.4%.

[0029] CN118106220A discloses a sintering fuel sorting device and screening control method. The sintering fuel sorting device provided by the invention solves the technical problem that it is difficult to achieve the fixed-scale supply of sintering fuel within the range of 0.5mm to 3mm when screening the sintering fuel. However, the structure of the device is relatively complex. In view of the problems existing in the above-mentioned prior art, the present application provides a fuel screening premixed combustion enhancement device as follows:

[0030] Embodiment 1:

[0031] Reference Figure 1 The present invention provides a fuel screening premixing combustion enhancement device, comprising:

[0032] A conveyor belt 1 is mounted on a support through two rollers 2, and one end of the conveyor belt 1 is used to receive fuel particles;

[0033] The mesh core screen 3 is arranged on the conveyor belt 1, and a plurality of screening holes are opened on the mesh core screen 3, and the conveyor belt 1 screens the fuel particles through the plurality of screening holes;

[0034] A preheating element is arranged above the conveyor belt 1, and a preheating chamber is formed between the preheating element and the conveyor belt 1, which is used to preheat the fuel particles on the conveyor belt 1, and the preheating element is connected to the external hot exhaust gas;

[0035] The collecting piece is arranged below the conveyor belt 1 and is used for collecting the fuel particles screened by the conveyor belt 1 .

[0036] In one embodiment of the present invention, the fuel is conveyed to the conveyor belt 1 after being crushed by four rollers. When moving on the conveyor belt 1, the fuel particles are screened by the mesh screen 3, and the screened small particles fall into the collecting part below. The particles on the conveyor belt 1 are preheated by the preheating part to improve the combustion conditions of the fuel, thereby reducing the solid fuel consumption in the sintering process, improving the quality of the sintered ore, and are conveyed to the fuel bin for combustion.

[0037] As an optional embodiment, the preheating part includes a preheating pipe 4, two baffles 7 are respectively arranged on both sides between the preheating pipe 4 and the conveyor belt 1, a preheating chamber is formed between the preheating pipe 4, the conveyor belt 1 and the two baffles 7, and a heat medium inlet 5 and a heat medium outlet 6 are respectively opened at both ends of the preheating pipe 4, and the heat medium inlet 5 is connected to the external hot exhaust gas.

[0038] In one embodiment of the present invention, the preheating pipe 4 is connected to a baffle 7 with a height of 20 cm on the conveyor belt 1 to form a closed space, ensuring that heat is concentrated on the coke particles on the conveyor belt 1, preventing fuel particles from leaking during screening and transportation, and increasing safety. Hot exhaust gas from the sintering ring cooler is introduced into the pipe.

[0039] As an optional implementation, a plurality of fins 8 are fixedly connected to the bottom end of the preheating pipe 4 along the axial direction.

[0040] In one embodiment of the present invention, the fins 8 are preferably made of aluminum alloy, and the fins 8 are evenly distributed to enhance heat conduction and heat dissipation effects and improve fuel preheating efficiency.

[0041] As an optional embodiment, the collecting member includes a fuel buffer tank 9 located below the conveyor belt 1 , and the fuel buffer tank 9 is connected to the conveyor belt 1 via a plurality of rollers 10 .

[0042] In one embodiment of the present invention, the sieved fine fuel particles (≤1 mm) fall into the fuel buffer tank 9 below the conveyor belt 1. The fuel buffer tank 9 is connected to the conveyor belt 1 through a plurality of rollers 10 to ensure the stability of the system.

[0043] As an optional embodiment, it also includes a sintering fuel bin 11 and a fine-particle fuel bin 12. The sintering fuel bin 11 is used to receive the fuel particles on the conveyor belt 1, and the fine-particle fuel bin 12 is used to receive the fuel particles in the fuel buffer tank 9.

[0044] In one embodiment of the present invention, the fine coke particles in the fuel buffer tank 9 are stored in the fine-particle fuel bin 12 for standby use, while the larger coke particles continue to be conveyed forward along the conveyor belt and finally enter the sintering fuel bin 11.

[0045] As an optional embodiment, it further includes a tensioner 13 which is installed on the conveyor belt 1 .

[0046] In one embodiment of the present invention, the tensioner 13 can be adjusted in real time according to the tightness of the conveyor belt 1 to maintain appropriate tension and prevent slipping and breaking.

[0047] As an optional implementation, it further includes a vibration motor 14 , which is installed on the conveyor belt 1 .

[0048] In one embodiment of the present invention, the power end of the conveyor belt 1 is equipped with a vibration motor 14, which vibrates the mesh screen 3 during the transmission process to improve the screening efficiency and ensure that smaller particles can pass through the mesh screen 3 smoothly.

[0049] As an optional embodiment, the conveyor belt 1 is inclined with respect to the ground, and the inclination angle is not greater than 30°. The preheating pipe 4 and the fuel buffer tank 9 are arranged parallel to the conveyor belt 1 .

[0050] In one embodiment of the present invention, the conveyor belt 1 is inclined with respect to the ground, preferably at an angle of 15°, to ensure stable transportation of the fuel particles and avoid accumulation of the fuel particles.

[0051] As an optional implementation, the diameter of the sieve holes is 1 mm.

[0052] In one embodiment of the present invention, fuel particle sizes of 0mm-1mm and 1mm-3mm are screened and separated, and more fuel particle sizes that are beneficial to sintering are used for production to avoid excessive particle sizes less than 0.5mm, which will reduce the high temperature retention time due to excessive combustion speed and affect mineral melting.

[0053] As an optional implementation, the temperature in the preheating chamber is 200°C-500°C.

[0054] Embodiment 2:

[0055] Reference Figure 2 The difference between this embodiment and the first embodiment is that a support frame 15 is provided on the bracket where the conveyor belt 1 is located, and a rotating roller 16 is rotatably connected to the support frame 15. The rotating roller 16 is located in the conveyor belt 1 and contacts with the bottom end of the conveyor belt 1 of the annular structure. A plurality of protrusions 17 are fixedly connected to the rotating roller 16, and the protrusions 17 are adapted to the screening holes.

[0056] Specifically, the rotating roller 16 is driven to rotate by a separate motor (not shown in the figure), and its rotation direction is opposite to that of the drum 2. When in use, the rotating roller 16 is rotated by the set motor alone, so that the protrusion 17 on the rotating roller 16 extends into the corresponding screening hole, and the fuel particles stuck in the screening hole are pushed out, so as to avoid the screening hole being blocked by the fuel particles, thereby ensuring subsequent stable and continuous screening.

[0057] In one embodiment of the present invention, a collecting trough 18 is further provided on the specific support frame 15, and a grille mesh 19 is fixedly connected to the top of the collecting trough 18. The grille mesh 19 contacts the bottom end of the conveyor belt 1, and when the protrusion 17 extends into the screening hole, it is located in the gap on the grille mesh 19, thereby ensuring stable removal and collection of particles in the screening hole.

[0058] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to 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 invention.

[0059] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A fuel screening premixing combustion enhancement device, characterized in that: include: A conveyor belt (1) is mounted on a support via two rollers (2), one end of the conveyor belt (1) being used to receive fuel particles; A mesh core screen (3) is arranged on the conveyor belt (1), a plurality of screening holes are provided on the mesh core screen (3), and the conveyor belt (1) screens fuel particles through the plurality of screening holes; A preheating element is arranged above the conveyor belt (1), a preheating chamber is formed between the preheating element and the conveyor belt (1), and is used to preheat the fuel particles on the conveyor belt (1), and the preheating element is in communication with external hot exhaust gas; A collecting piece is arranged below the conveyor belt (1) and is used to collect the fuel particles screened by the conveyor belt (1).

2. A fuel screening premixed combustion enhancement device according to claim 1, characterized in that: The preheating element comprises a preheating pipe (4), two baffles (7) are respectively arranged on both sides between the preheating pipe (4) and the conveyor belt (1), the preheating chamber is formed between the preheating pipe (4), the conveyor belt (1) and the two baffles (7), and a heat medium inlet (5) and a heat medium outlet (6) are respectively opened at both ends of the preheating pipe (4), and the heat medium inlet (5) is connected to the external hot exhaust gas.

3. A fuel screening premixed combustion enhancement device according to claim 2, characterized in that: A plurality of ribs (8) are fixedly connected to the bottom end of the preheating pipe (4) along the axial direction.

4. A fuel screening premixed combustion enhancement device according to claim 2, characterized in that: The collecting component comprises a fuel buffer tank (9) which is located below the conveyor belt (1); the fuel buffer tank (9) is connected to the conveyor belt (1) via a plurality of rollers (10).

5. A fuel screening premixed combustion enhancement device according to claim 4, characterized in that: It also includes a sintering fuel bin (11) and a fine-particle fuel bin (12), wherein the sintering fuel bin (11) is used to receive the fuel particles on the conveyor belt (1), and the fine-particle fuel bin (12) is used to receive the fuel particles in the fuel buffer tank (9).

6. A fuel screening premixed combustion enhancement device according to claim 1, characterized in that: It also comprises a tensioner (13), wherein the tensioner (13) is installed on the conveyor belt (1).

7. A fuel screening premixed combustion enhancement device according to claim 1, characterized in that: It also includes a vibration motor (14), which is installed on the conveyor belt (1).

8. A fuel screening premixed combustion enhancement device according to claim 4, characterized in that: The conveyor belt (1) is arranged to be inclined with respect to the ground, and the inclination angle is not greater than 30°. The preheating pipe (4) and the fuel buffer tank (9) are arranged parallel to the conveyor belt (1).

9. A fuel screening premixed combustion enhancement device according to claim 1, characterized in that: The sieve holes have a diameter of 1 mm.

10. A fuel screening premixed combustion enhancement device according to claim 1, characterized in that: The temperature in the preheating chamber is 200°C-500°C.

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