Combustion device of coal-fired boiler

Abstract

The utility model discloses a combustion device of a coal-fired boiler, which comprises a hearth main body, a coal feeding port is arranged at the top of the surface of the hearth main body, a coal mill connecting pipe positioned on one side of the coal feeding port is fixedly arranged on the surface of the hearth main body, and one end of the coal mill connecting pipe extends into the hearth main body. According to the combustion device of the coal-fired boiler, the layered coal feeding device is used, blocks and powder in raw coal are loosely distributed on the fire grate from bottom to top through gravity screening, air inlet is facilitated, the combustion condition is improved, the combustion rate of the coal is increased, the carbon content of ash is reduced, and the combustion efficiency is improved. The coal-saving rate of 5%-20% can be obtained, the energy-saving effect varies according to the furnace condition before change, the worse the furnace condition is, the better the effect is, a proper amount of pulverized coal can be sprayed to the proper position of the hearth main body through the pulverized coal timing ejector, on the basis of grate combustion, a proper amount of suspension combustion is added, and the energy-saving rate of about 10% can be obtained.

Description

Technical Field

[0001] The utility model relates to the technical field of coal-fired boilers, in particular to a combustion device of a coal-fired boiler. Background Art

[0002] A coal-fired boiler is a common energy conversion device that generates heat by burning coal and is mainly used for heating and industrial production.

[0003] There are many types of coal-fired boilers, which can be divided according to different classification methods. According to the combustion method, they can be divided into layer-burning furnaces and chamber-burning furnaces. Layer-burning furnaces are to lay coal blocks flat on the chain grate for layered combustion. Its advantages are less auxiliary equipment, simple manufacturing and installation, easy operation and operation, and are suitable for small and medium-sized boilers. The disadvantage is that the coal is not burned completely, the slag and fly ash contain a lot of combustibles, and the boiler efficiency is generally 75-85%. The chamber-burning furnace is also called a pulverized coal furnace. After the pulverized coal is sprayed into the furnace, it can quickly catch fire, and the flue gas can reach a high temperature of about 1500℃. The advantage of this boiler is that it can burn various coals and burn more completely, so the boiler capacity can be made very large, which is suitable for large, medium and extra-large boilers.

[0004] The combustion device of the traditional coal-fired boiler has the following defects:

[0005] (1) When using the combustion device of a traditional coal-fired boiler, the coal blocks are not stacked and burned in layers, resulting in a lack of air intake and incomplete combustion;

[0006] (2) When using the combustion device of a traditional coal-fired boiler, the combustion of traditional coal blocks requires a long time, which makes it impossible to increase the fire and effectively save energy. Utility Model Content

[0007] The purpose of the utility model is to provide a combustion device for a coal-fired boiler, so as to solve the problems raised in the above-mentioned background technology that when using the combustion device of a traditional coal-fired boiler, the coal blocks are not stacked and burned in layers, resulting in failure to enter the air and incomplete combustion; when using the combustion device of a traditional coal-fired boiler, the traditional coal blocks need to burn for a long time during combustion, resulting in failure to increase the fire and effectively save energy.

[0008] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a combustion device of a coal-fired boiler, comprising a furnace body, a coal feeding port is provided on the top of the surface of the furnace body, a coal mill connecting pipe located on one side of the coal feeding port is fixedly provided on the surface of the furnace body, one end of the coal mill connecting pipe extends to the interior of the furnace body, a coal powder timing injector is fixedly installed on the surface of the coal mill connecting pipe, a plurality of evenly distributed water-cooled walls are fixedly installed in the middle of the surface of the furnace body, an economizer is fixedly installed on the top of the furnace body, and the economizer A flue connecting pipe is fixedly connected to the top of the coal burner, an induced draft fan is fixedly installed inside the flue connecting pipe, a flue duct is fixedly connected to the top of the induced draft fan, a heat-conducting inner wall is fixedly arranged in the middle of the inner wall of the furnace body, a stratified coal feeding device located below the heat-conducting inner wall is fixedly arranged inside the furnace body, the stratified coal feeding device comprises a connecting plate, a large plate frame and a small plate frame, the top of the connecting plate is fixedly connected to the bottom of the large plate frame, the bottom of the connecting plate is fixedly connected to the top of the small plate frame, and the induced draft fan functions to extract the flue gas in the furnace.

[0009] Preferably, a connection port located on one side of the blower is provided at the bottom of the inner wall of the furnace body, and the connection port is used to connect the blower.

[0010] Preferably, a coal adding connection switch is fixedly installed on the top of the coal adding port, and the coal adding connection switch is used to open the coal adding port.

[0011] Preferably, a burner is fixedly mounted on the bottom of the furnace body surface, and a plurality of evenly distributed burner outlets are fixedly provided at the output end of the burner. The burner burns the coal blocks to generate high-temperature flue gas.

[0012] Preferably, a blower located below the burner is fixedly mounted on the surface of the furnace body, and the blower provides sufficient air to the furnace to ensure sufficient combustion of the pulverized coal.

[0013] Preferably, one end of the flue connecting pipe is threadedly connected with a blocking disk, and the blocking disk is used to close the flue connecting pipe.

[0014] Preferably, a coal ash outlet is fixedly connected to the bottom of the furnace body, and the coal ash outlet is used to output coal ash.

[0015] Preferably, the periphery of the bottom of the furnace body is fixedly connected with support columns distributed in a rectangular shape, and gaskets are fixedly provided at the bottom of a plurality of the support columns, and the support columns are used to support the furnace body.

[0016] Compared with the prior art, the utility model has the following beneficial effects: using a stratified coal feeding device, through gravity screening, the raw coal lumps and fines are loosely distributed on the grate from bottom to top, which is beneficial to air intake, improves the combustion conditions, increases the coal combustion rate, reduces the carbon content of ash, and can obtain a coal saving rate of 5%-20%. The energy-saving effect varies depending on the furnace conditions before the modification. The worse the furnace conditions, the better the effect. A proper amount of coal powder can be sprayed into the appropriate position of the furnace body through a coal powder timing injector, so that on the basis of grate layer combustion, a proper amount of suspended combustion is added, which can obtain an energy saving rate of about 10%. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional structural diagram of the utility model;

[0018] Figure 2 It is a structural schematic diagram of the utility model;

[0019] Figure 3 This is a front view structural diagram of the utility model;

[0020] Figure 4 It is a front view cross-sectional structural diagram of the utility model.

[0021] In the figure: 1. furnace body; 2. coal feeding port; 3. coal feeding connection switch; 4. coal mill connecting pipe; 5. coal powder timing injector; 6. water-cooled wall; 7. burner; 8. blower; 9. coal ash outlet; 10. support column; 11. gasket; 12. economizer; 13. flue connecting pipe; 14. blocking plate; 15. induced draft fan; 16. flue gas duct; 17. connection port; 18. heat-conducting inner wall; 19. burner outlet; 20. layered coal feeding device; 21. connecting plate; 22. large plate rack; 23. small plate rack. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] See also Figure 1-4The utility model provides a combustion device of a coal-fired boiler, comprising a furnace body 1, a coal feeding port 2 is provided on the top of the surface of the furnace body 1, a coal mill connecting pipe 4 is fixedly provided on the surface of the furnace body 1 and is located on one side of the coal feeding port 2, one end of the coal mill connecting pipe 4 extends to the inside of the furnace body 1, a coal powder timing injector 5 is fixedly installed on the surface of the coal mill connecting pipe 4, a plurality of evenly distributed water cooling walls 6 are fixedly installed in the middle of the surface of the furnace body 1, an economizer 12 is fixedly installed on the top of the furnace body 1, and the top of the economizer 12 is fixedly installed. A flue connecting pipe 13 is connected, an induced draft fan 15 is fixedly installed inside the flue connecting pipe 13, a flue gas duct 16 is fixedly connected to the top of the induced draft fan 15, a heat-conducting inner wall 18 is fixedly arranged in the middle of the inner wall of the furnace body 1, and a stratified coal feeding device 20 located below the heat-conducting inner wall 18 is fixedly arranged inside the furnace body 1. The stratified coal feeding device 20 includes a connecting plate 21, a large plate frame 22 and a small plate frame 23. The top of the connecting plate 21 is fixedly connected to the bottom of the large plate frame 22, and the bottom of the connecting plate 21 is fixedly connected to the top of the small plate frame 23.

[0024] When in use, a heat-conducting inner wall 18 is provided in the middle of the inner wall of the furnace body 1, and heat is transferred to the water-cooled wall 6 through the heat-conducting inner wall 18.

[0025] A connection port 17 located on one side of the blower 8 is provided at the bottom of the inner wall of the furnace body 1, a coal adding connection switch 3 is fixedly installed on the top of the coal adding port 2, a burner 7 is fixedly installed at the bottom of the surface of the furnace body 1, and a plurality of evenly distributed burner outlets 19 are fixedly provided at the output end of the burner 7, and a blower 8 located below the burner 7 is fixedly installed on the surface of the furnace body 1.

[0026] When in use, a blower 8 located below the burner 7 is installed on the surface of the furnace body 1. The blower 8 provides sufficient air for the furnace body 1 to ensure full combustion of the coal powder.

[0027] One end of the flue connecting pipe 13 is threadedly connected to a blocking plate 14, the bottom of the furnace body 1 is fixedly connected to a coal ash outlet 9, the periphery of the bottom of the furnace body 1 is fixedly connected to support columns 10 distributed in a rectangular shape, and gaskets 11 are fixedly provided at the bottom of multiple support columns 10.

[0028] When in use, the outer periphery of the bottom of the furnace body 1 is connected to support columns 10 distributed in a rectangular shape, and the furnace body 1 is supported by the support columns 10 .

[0029] During specific use, the utility model is a combustion device for a coal-fired boiler. When using the combustion device for a coal-fired boiler, by pressing the coal adding connection switch 3, opening the coal adding port 2, adding coal blocks, starting the burner 7 to burn the coal blocks, and using a layered coal feeding device 20 in the furnace body 1. Through gravity screening, the raw coal blocks and the fine coal are loosely distributed on the grate from bottom to top, which is beneficial to air intake, improves the combustion condition, increases the coal combustion rate, reduces the carbon content of ash, and can obtain a coal saving rate of 5%-20%. The energy saving effect varies depending on the furnace condition before the change. The worse the furnace condition, the better the effect. The coal powder timing injector 5 can spray an appropriate amount of coal powder into the appropriate position of the furnace body 1, so that on the basis of the grate layer combustion, an appropriate amount of suspended combustion is added, and an energy saving rate of about 10% can be obtained. This is the use process of the combustion device for a coal-fired boiler.

[0030] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art may still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A combustion device for a coal-fired boiler, comprising a furnace body (1), Features: A coal feeding port (2) is provided at the top of the surface of the furnace body (1), a coal mill connecting pipe (4) is fixedly provided on the surface of the furnace body (1) and is located on one side of the coal feeding port (2), one end of the coal mill connecting pipe (4) extends into the interior of the furnace body (1), a coal powder timing injector (5) is fixedly installed on the surface of the coal mill connecting pipe (4), a plurality of evenly distributed water cooling walls (6) are fixedly installed in the middle of the surface of the furnace body (1), an economizer (12) is fixedly installed on the top of the furnace body (1), a flue connecting pipe (13) is fixedly connected to the top of the economizer (12), and the flue connecting pipe (13) is fixedly connected to the top of the economizer (12). An induced draft fan (15) is fixedly installed inside the connecting pipe (13), and a flue gas duct (16) is fixedly connected to the top of the induced draft fan (15). A heat-conducting inner wall (18) is fixedly arranged in the middle of the inner wall of the furnace body (1). A stratified coal feeding device (20) located below the heat-conducting inner wall (18) is fixedly arranged inside the furnace body (1), and the stratified coal feeding device (20) comprises a connecting plate (21), a large plate frame (22) and a small plate frame (23), and the top of the connecting plate (21) is fixedly connected to the bottom of the large plate frame (22), and the bottom of the connecting plate (21) is fixedly connected to the top of the small plate frame (23).

2. A combustion device for a coal-fired boiler according to claim 1, Features: A connection port (17) located on one side of the blower (8) is provided at the bottom of the inner wall of the furnace body (1).

3. A combustion device for a coal-fired boiler according to claim 1, Features: A coal adding connection switch (3) is fixedly mounted on the top of the coal adding port (2).

4. A combustion device for a coal-fired boiler according to claim 1, Features: A burner (7) is fixedly mounted on the bottom of the surface of the furnace body (1), and a plurality of evenly distributed burner outlets (19) are fixedly arranged at the output end of the burner (7).

5. A combustion device for a coal-fired boiler according to claim 4, Features: A blower (8) located below the burner (7) is fixedly mounted on the surface of the furnace body (1).

6. A combustion device for a coal-fired boiler according to claim 1, Features: One end of the flue connecting pipe (13) is threadedly connected to a blocking disk (14).

7. A combustion device for a coal-fired boiler according to claim 1, Features: A coal ash outlet (9) is fixedly connected to the bottom of the furnace body (1).

8. A combustion device for a coal-fired boiler according to claim 1, Features: Support columns (10) distributed in a rectangular shape are fixedly connected to the periphery of the bottom of the furnace body (1), and gaskets (11) are fixedly arranged at the bottoms of a plurality of the support columns (10).

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