Multi-fuel coupling combustion device

Abstract

The utility model discloses a multi-fuel coupling combustion device, which comprises a material mixing device, a combustion device and a combustion device, one end of the first conveying device is connected with the mixing device, and the other end of the first conveying device is connected with a rotary blanking valve; one end of the second conveying device is connected with the rotary blanking valve, and the other end is connected with a combustion hearth; the liquid fuel atomizing nozzle and the gas combustor are arranged on the combustion hearth, the liquid fuel atomizing nozzle is used for spraying atomized liquid fuel into the combustion hearth, and the gas combustor is used for combusting gas fuel; the air supply device is connected with the combustion hearth; and the flame outlet and the fire grate are arranged on the combustion hearth. The mixing device pretreats and mixes different types of solid fuels, the liquid fuel is sprayed into fine fog drops through the atomizing nozzle, the combustion rate and efficiency are improved, the gas fuel is directly and efficiently combusted through the gas combustor, and stable combustion of the gas fuel, the liquid fuel and the solid fuel is achieved through the synergistic effect of the three fuels.

Description

Technical Field

[0001] The utility model belongs to the technical field of combustion devices, and in particular relates to a multi-fuel coupled combustion device. Background Art

[0002] With the limited availability of traditional fossil energy and increasing environmental pressure, it is necessary to develop and utilize a variety of fuel resources to ensure the sustainability of energy supply. The combined use of multiple fuels can reduce dependence on a single fuel, mitigate the impact of fluctuations in the supply of a single fuel, and ensure a stable energy supply. By optimizing the combustion process and fuel combination, pollutant emissions can be reduced to a certain extent, which is beneficial to environmental protection. However, the current coupled combustion of multiple fuels presents significant differences in the physical and chemical properties of different fuels (such as calorific value, volatility, ignition point, etc.), making coordinated combustion and optimized control difficult. Multiple fuels are prone to flameout, flashback, and instability during combustion, and pollutant reduction is also difficult. Currently, there is no equipment on the market specifically designed for the mixed combustion of gas, liquid, and solid fuels. Summary of the Invention

[0003] The utility model provides a multi-fuel coupled combustion device, which is used to solve the technical defects of flameout and unstable backfire in the process of mixed combustion of gas, liquid and solid fuels.

[0004] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0005] A multi-fuel coupled combustion device, comprising:

[0006] Mixing device for mixing different types of solid fuels;

[0007] a first conveying device, one end of which is connected to the mixing device and the other end of which is connected to a rotary blanking valve;

[0008] a second conveying device, one end of which is connected to the rotary blanking valve and the other end of which is connected to the combustion furnace;

[0009] A liquid fuel atomizing nozzle and a gas burner are arranged on the combustion furnace, the liquid fuel atomizing nozzle is used to spray atomized liquid fuel into the combustion furnace, and the gas burner is used to burn the gas fuel;

[0010] an air supply device connected to the combustion furnace;

[0011] The flame outlet and the grate are arranged on the combustion furnace.

[0012] Furthermore, the mixing device includes a mixing silo, a stirring silo is provided on the top of the mixing silo, and a mixing agitator and a gate valve are provided on the stirring silo;

[0013] A storage silo is provided at the bottom of the mixing silo, and the first conveying device is connected to the storage silo.

[0014] Furthermore, a first solid fuel hopper and a second solid fuel hopper are provided on the top of the mixing agitator.

[0015] Furthermore, the gate valve is arranged between the stirring silo and the mixing silo.

[0016] Furthermore, an observation window is provided on the storage silo.

[0017] Furthermore, a plurality of the liquid fuel atomizing nozzles are provided, and the plurality of liquid fuel atomizing nozzles are connected by a bracket, and the bracket is provided on the combustion furnace.

[0018] Furthermore, the combustion furnace is provided with a calcium injection port, a flue gas recirculation port, a slag outlet and an ash outlet, the calcium injection port, the slag outlet and the ash outlet are sequentially arranged on the combustion furnace at intervals, and the flue gas recirculation port is arranged on the flame outlet;

[0019] The gas burner is arranged between the calcium injection port and the slag discharge port.

[0020] Furthermore, the air supply device includes a first air duct, a second air duct and a third air duct, the end of the first air duct is connected to the combustion furnace, one end of the second air duct is connected to the side wall of the first air duct, and the other end is connected to the combustion furnace;

[0021] One end of the third air duct is connected to the side wall of the first air duct, and the other end is connected to the flame outlet.

[0022] Furthermore, the grate is arranged at one end of the combustion furnace close to the air supply device.

[0023] Furthermore, the first conveying device and the second conveying device are both screw conveyors.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1. Pre-treating and mixing the solid fuel through the mixing device can ensure that the solid fuel reaches a more uniform and flammable state before entering the combustion furnace; at the same time, the liquid fuel is sprayed into fine droplets through the atomizing nozzle, which greatly increases the contact area with the air and improves the combustion rate and efficiency. The gas fuel is directly and efficiently burned by the gas burner. The synergistic effect of the three realizes the stable combustion of the three fuels of gas, liquid and solid; finally, the air supply device is used to coordinate and optimize the combustion to ensure that there will be no problems such as flameout and backfire, thereby improving the overall combustion efficiency.

[0026] 2. By setting up a mixing silo and a mixing agitator, the solid fuel entering the mixing silo can be fully mixed and stirred, ensuring the uniformity of the solid fuel during the mixing process, avoiding the problem of uneven combustion caused by differences in fuel particle size, density, etc., thereby improving combustion efficiency and stability; the gate valve above the mixing silo can control the feed speed and amount of fuel as needed, so that the fuel ratio can be adjusted according to actual conditions during the mixing process to meet different combustion requirements. At the same time, the gate valve can also prevent material backflow and maintain pressure balance in the mixing silo.

[0027] 3. The two fuel hoppers allow different types of solid fuel to enter the agitator separately, thereby achieving better uniform mixing during the mixing process, helping to reduce interference and conflict during the mixing process and improve mixing efficiency.

[0028] 4. During the mixing process, the materials in the mixing silo are in a dynamic mixing state, while the mixing silo is used to store evenly mixed materials. The setting of the gate valve separates these two areas with different states, avoiding the unevenly mixed materials from directly entering the storage link, ensuring the stability and efficiency of the subsequent combustion process.

[0029] 5. The observation window allows the operator to directly observe the status of the internal materials without opening the storage silo, providing an important reference for the operator, helping to promptly discover and deal with possible problems, thereby more accurately arranging production plans and adjusting production parameters.

[0030] 6. By rationally arranging multiple nozzles on the combustion furnace, the fuel can be evenly distributed in the furnace, which helps to avoid local fuel being too rich or too thin and improves the stability and uniformity of combustion.

[0031] 7. The calcium injection port is used to inject desulfurizer into the furnace for in-furnace desulfurization. The desulfurizer can be sprayed directly into the high-temperature combustion area to improve the reaction efficiency of the desulfurizer with sulfur dioxide in the flue gas, and effectively reduce sulfur dioxide emissions in the flue gas. Compared with other desulfurization methods, the in-furnace calcium injection desulfurization technology has the advantages of low investment and low operating cost. Through reasonable calcium injection port design, the desulfurization effect can be further optimized and the desulfurization cost can be reduced.

[0032] 8. The first air duct, serving as the main air supply channel, directly delivers a large amount of air into the combustion furnace, providing the necessary oxygen for fuel combustion, ensuring uniform oxygen distribution within the combustion furnace, and facilitating full combustion of the fuel. The second air duct connects to the side wall of the first air duct and delivers air to a specific area of the combustion furnace. The air supply position and volume can be flexibly adjusted according to the combustion conditions within the combustion furnace to optimize the combustion process and improve combustion efficiency. The third air duct is connected to the flame outlet. Its air supply function is mainly to stabilize the flame shape and extend the flame length. By supplying air to the flame outlet, the turbulence of the flame can be increased, making the flame more stable and reducing the risk of flame vibration and extinction.

[0033] 9. The grate is close to the air supply device so that the air sent in from the air supply device can be quickly and fully mixed with the fuel on the grate, which helps the fuel burn more fully and improves combustion efficiency.

[0034] 10. The screw conveyor has the characteristic of continuous conveying, which can ensure the continuous supply of fuel and meet the combustion needs uninterruptedly. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0036] Figure 1 This is a schematic diagram of the overall mechanism for efficient gas-liquid-solid fuel coupled combustion provided by the utility model;

[0037] Among them: 1. Mixing silo; 101. First solid fuel hopper; 102. Second solid fuel hopper; 103. Mixing agitator; 104. Mixing silo; 105. Gate valve; 106. Storage silo; 107. Observation window; 2. First conveying device; 3. Rotary blanking valve; 4. Second conveying device; 5. Combustion furnace; 501. Calcium injection port; 502. Flue gas recirculation port; 503. Slag outlet; 504. Ash outlet; 6. Liquid fuel atomizing nozzle; 7. Gas burner; 8. Air supply duct; 801. First air duct; 802. Second air duct; 803. Third air duct; 9. Flame outlet; 10. Grate. DETAILED DESCRIPTION

[0038] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0039] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are also within the scope of protection of the present invention.

[0040] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0041] In the description of the embodiments of the present invention, it should be noted that if the terms "upper," "lower," "horizontal," "inner," etc. appear, the orientation or positional relationship indicated is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the invention is usually placed when in use. These terms are only used to facilitate the description of the present invention and simplify the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, they should not be understood as limitations on the present invention. In addition, the terms "first," "second," etc. are used only to distinguish descriptions and should not be understood as indicating or implying relative importance.

[0042] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0043] In the description of the embodiments of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0044] With the limited availability of traditional fossil energy and increasing environmental pressure, it is necessary to develop and utilize a variety of fuel resources to ensure the sustainability of energy supply. The combined use of multiple fuels can reduce dependence on a single fuel, mitigate the impact of fluctuations in the supply of a single fuel, and ensure a stable energy supply. By optimizing the combustion process and fuel combination, pollutant emissions can be reduced to a certain extent, which is beneficial to environmental protection. However, the current coupled combustion of multiple fuels presents significant differences in the physical and chemical properties of different fuels (such as calorific value, volatility, ignition point, etc.), making coordinated combustion and optimized control difficult. Multiple fuels are prone to flameout, flashback, and instability during combustion, and pollutant reduction is also difficult. Currently, there is no equipment on the market specifically designed for the mixed combustion of gas, liquid, and solid fuels.

[0045] In order to solve the above technical defects, the inventor provides a mechanism for efficient coupled combustion of gas, liquid and solid fuels.

[0046] The present invention is described in further detail below with reference to the accompanying drawings:

[0047] like Figure 1 As shown, an embodiment of the utility model provides a mechanism for efficient combustion of gas, liquid and solid fuel coupling, including a mixing device, the mixing device is used to mix different types of solid fuels, a first conveying device 2, one end of which is connected to the outlet end of the mixing device, and the other end is connected to a rotary blanking valve 3, a second conveying device 4, one end of which is connected to the rotary blanking valve 3, and the other end is connected to a combustion furnace 5, a liquid fuel atomizing nozzle 6 and a gas burner 7, which are arranged on the combustion furnace 5, the liquid fuel atomizing nozzle 6 is used to spray atomized liquid fuel into the combustion furnace 5, and the gas burner 7 is used to burn gas fuel; an air supply device 8, connected to the combustion furnace 5, for conveying air into the combustion furnace 5; a flame outlet 9 and a grate 10, which are arranged on the combustion furnace 5. By pre-treating and mixing different types of solid fuels through the mixing device, it can be ensured that different types of solid fuels reach a more uniform and more flammable state before entering the combustion furnace 5; at the same time, the liquid fuel is sprayed into fine droplets through the liquid fuel atomizing nozzle 6, which greatly increases the contact area with the air and improves the combustion rate and efficiency. The gas fuel is directly and efficiently burned through the gas burner 7. The three work together to achieve stable combustion of the three types of fuels: gas, liquid and solid; finally, the air supply device 8 is used to coordinate and optimize the combustion to ensure that there will be no problems of flameout and backfire, thereby improving the overall combustion efficiency.

[0048] like Figure 1As shown, the mixing device includes a mixing silo 1, with a stirring silo 104 provided on the top of the mixing silo 1, and a mixing agitator 103 and a gate valve 105 provided on the mixing silo 104. By providing the mixing silo 1 and the mixing agitator 103, the solid fuel entering the mixing silo 104 can be fully mixed and stirred, ensuring the uniformity of the solid fuel during the mixing process, avoiding the problem of uneven combustion caused by differences in fuel particle size, density, etc., thereby improving combustion efficiency and stability. The gate valve 105 above the mixing silo 1 can control the feed rate and amount of fuel as needed, so that the fuel ratio can be adjusted according to actual conditions during the mixing process to meet different combustion requirements. At the same time, the gate valve 105 can also prevent material backflow and maintain pressure balance in the mixing silo 104. A storage silo 106 is provided at the bottom of the mixing silo 1, and the first conveying device 2 is connected to the storage silo 106. The storage silo 106 is used to store and mix the mixed different types of solid fuels and convey them to the interior of the combustion furnace 5 through the first conveying device 2. like Figure 1 As shown, in order to effectively mix different types of solid fuels, a first solid fuel hopper 101 and a second solid fuel hopper 102 are provided on the top of the mixer 103. The two fuel hoppers allow different types of solid fuels to enter the mixer 103 separately, thereby achieving better uniform mixing during the mixing process, helping to reduce interference and conflict during the mixing process and improve mixing efficiency. Figure 1 As shown, the gate valve 105 is arranged between the stirring silo 104 and the mixing silo 1. The setting of the gate valve 15 isolates the two areas with different states, avoids unevenly mixed materials from directly entering the storage link, and ensures the stability and efficiency of the subsequent combustion process.

[0049] like Figure 1As shown, an observation window 107 is also provided on the storage silo 106. The observation window 107 allows the operator to directly observe the state of the material inside without opening the storage silo 106, providing an important reference for the operator, helping to promptly discover and address potential problems, thereby more accurately arranging production plans and adjusting production parameters. A plurality of liquid fuel atomizing nozzles 6 are provided above the combustion furnace 5. The plurality of liquid fuel atomizing nozzles 6 are connected by a bracket, which is provided on the combustion furnace 5. By rationally arranging the plurality of liquid fuel atomizing nozzles 6 on the combustion furnace 5, a uniform distribution of fuel within the combustion furnace 5 can be achieved, helping to avoid localized over-rich or over-lean fuel conditions and improving combustion stability and uniformity. Secondly, a calcium injection port 501, a flue gas recirculation port 502, a slag outlet 503 and an ash outlet 504 are provided on the combustion furnace 5. The calcium injection port 501, the slag outlet 503 and the ash outlet 504 are sequentially arranged on the combustion furnace 5, the flue gas recirculation port 502 is arranged on the flame outlet 9, and the gas burner 7 is arranged between the calcium injection port 501 and the slag outlet 503; wherein, the calcium injection port 501 is used to inject a desulfurizer into the combustion furnace 5 to perform in-furnace desulfurization. The desulfurizer can be directly injected into the high-temperature combustion area to improve the reaction efficiency of the desulfurizer with sulfur dioxide in the flue gas, and effectively reduce the sulfur dioxide emission in the flue gas. Compared with other desulfurization methods, the in-furnace calcium injection desulfurization technology has the advantages of low investment and low operating cost. Through the reasonable design of the calcium injection port 501, the desulfurization effect can be further optimized and the desulfurization cost can be reduced. Figure 1 As shown, the air supply device 8 in this example includes a first air duct 801, a second air duct 802 and a third air duct 803. The end of the first air duct 801 is connected to the combustion furnace 5, one end of the second air duct 802 is connected to the side wall of the first air duct 801, and the other end is connected to the combustion furnace 5, one end of the third air duct 803 is connected to the side wall of the first air duct 801, and the other end is connected to the flame outlet 9; during operation, the first air duct 801 serves as the main air supply channel, directly supplying a large amount of air into the combustion furnace 5, providing the necessary oxygen for fuel combustion, ensuring the uniformity of oxygen distribution in the combustion furnace 5, and contributing to the full combustion of the fuel. The second air duct 802 is connected to the side wall of the first air duct 801 and sends air into a specific area of the combustion furnace 5. The air supply position and air supply volume can be flexibly adjusted according to the combustion conditions in the combustion furnace 5 to optimize the combustion process and improve combustion efficiency. The third air duct 803 is connected to the flame outlet 9. Its air supply function is mainly to stabilize the flame shape and extend the flame length. By supplying air to the flame outlet 9, the turbulence of the flame can be increased, making the flame more stable and reducing the risk of flame shaking and extinguishing. The grate 10 is set at one end of the combustion furnace 5 close to the air supply device 8, so that the air sent in from the air supply device 8 can be quickly and fully mixed with the fuel on the grate 10, which helps the fuel burn more fully and improves combustion efficiency. Figure 1 As shown, the first conveying device 2 and the second conveying device 4 are both screw conveyors. The screw conveyor has the characteristic of continuous conveying, which can ensure the continuous supply of fuel and meet the combustion demand uninterruptedly.

[0050] In summary, the embodiment of the present invention provides a mechanism for efficient coupled combustion of gas, liquid and solid fuels, which can achieve coordinated combustion of multiple fuels including gas, liquid and solid, ensure stable flames when multiple fuels are burned simultaneously under various working conditions, avoid unstable phenomena such as flameout and backfire, and comprehensively and effectively reduce pollutant emissions. During the combustion of fuel, the liquid fuel atomizing nozzle 6, gas burner 7, air supply device 8, flame outlet 9 and grate 10 provided on the combustion furnace 5 ensure that solid, liquid and gas fuels can be stably burned in the combustion furnace 5; the calcium injection port 501 and the flue gas recirculation port 502 ensure that the NOx amount at the combustion outlet is within the control range, and the slag outlet 503 and the ash outlet 504 can clean out the unburned slag and burnt ash in time, reducing the amount of ash brought out by the flame; finally, the flue gas recirculation port 502 and the third air duct 803 are connected to the flame outlet 9 to ensure sufficient combustion and reduce the temperature of the flame outlet 9, thereby reducing the NOx amount.

[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit its scope of protection. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that after reading the present invention, those skilled in the art may still make various changes, modifications or equivalent substitutions to the specific implementation methods of the invention, but these changes, modifications or equivalent substitutions are all within the scope of protection of the pending claims of the invention.

Claims

1. A multi-fuel coupled combustion device, characterized in that: include: Mixing device for mixing different types of solid fuels; A first conveying device (2), one end of which is connected to the mixing device and the other end of which is connected to a rotary blanking valve (3); A second conveying device (4), one end of which is connected to the rotary blanking valve (3) and the other end of which is connected to the combustion furnace (5); A liquid fuel atomizing nozzle (6) and a gas burner (7) are arranged on the combustion furnace (5), the liquid fuel atomizing nozzle (6) is used to spray atomized liquid fuel into the combustion furnace (5), and the gas burner (7) is used to burn gas fuel; An air supply device (8) connected to the combustion furnace (5); The flame outlet (9) and the grate (10) are arranged on the combustion furnace (5).

2. The combustion device according to claim 1, characterized in that The mixing device comprises a mixing silo (1), a stirring silo (104) is provided on the top of the mixing silo (1), and a mixing agitator (103) and a gate valve (105) are provided on the stirring silo (104); A storage silo (106) is provided at the bottom of the mixing silo (1), and the first conveying device (2) is connected to the storage silo (106).

3. The combustion device according to claim 2, characterized in that A first solid fuel hopper (101) and a second solid fuel hopper (102) are provided on the top of the mixing stirrer (103).

4. The combustion device according to claim 2, characterized in that The gate valve (105) is arranged between the stirring silo (104) and the mixing silo (1).

5. The combustion device according to claim 2, characterized in that: The storage silo (106) is provided with an observation window (107).

6. The combustion device according to claim 1, characterized in that A plurality of the liquid fuel atomizing nozzles (6) are provided, and the plurality of liquid fuel atomizing nozzles (6) are connected via a bracket, and the bracket is arranged on the combustion furnace (5).

7. The combustion device according to claim 1, characterized in that The combustion furnace (5) is provided with a calcium injection port (501), a flue gas recirculation port (502), a slag outlet (503) and an ash outlet (504); the calcium injection port (501), the slag outlet (503) and the ash outlet (504) are sequentially arranged at intervals on the combustion furnace (5); the flue gas recirculation port (502) is arranged on the flame outlet (9); The gas burner (7) is arranged between the calcium injection port (501) and the slag discharge port (503).

8. The combustion device according to claim 1, characterized in that The air supply device (8) comprises a first air duct (801), a second air duct (802) and a third air duct (803); the end of the first air duct (801) is connected to the combustion furnace (5); one end of the second air duct (802) is connected to the side wall of the first air duct (801), and the other end is connected to the combustion furnace (5); One end of the third air duct (803) is connected to the side wall of the first air duct (801), and the other end is connected to the flame outlet (9).

9. The combustion device according to claim 1, characterized in that: The grate (10) is arranged at one end of the combustion furnace (5) close to the air supply device (8).

10. The combustion device according to claim 1, characterized in that The first conveying device (2) and the second conveying device (4) are both screw conveyors.

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