Method of eliminating smoke from high smoke solid fuel by plasma flame assisted combustion

Abstract

The present application belongs to the field of smoke purification, in particular to a method for eliminating high smoke solid fuel smoke by means of plasma flame combustion-supporting, which is suitable for all furnaces, especially for furnaces using combustible garbage as fuel. The plasma flame is introduced into the furnace, and the high smoke solid fuel is ignited by the plasma flame and the smoke generated by the high smoke solid fuel is completely burned. The advantages of the present application are as follows: first, the continuous dynamic feeding greatly reduces the space of the combustion chamber, which facilitates the rapid increase of the chamber temperature and the complete burning of the smoke; second, the plasma flame is used to burn the smoke, and the temperature of the flame can reach about 8000 degrees, which is several times of the temperature of ordinary flame, so the smoke is burned more completely; third, the even fire grate is arranged at the chimney to intercept the smoke, which can eliminate the smoke that has not been burned and has low energy consumption and high efficiency.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of smoke purification, in particular to a method for eliminating high smoke solid fuel smoke by means of plasma flame combustion-supporting, which is suitable for all furnaces, especially for furnaces using combustible garbage as fuel. BACKGROUND

[0002] At present, there are many ways to purify the smoke of furnaces, among which the secondary combustion is the main one. The principle of secondary combustion is mainly to add clean fuel in the secondary combustion chamber to increase the overall temperature of the combustion chamber as much as possible so as to burn off the smoke. However, in order to increase the temperature of a large space combustion chamber, a lot of clean fuel needs to be added, which will inevitably have the disadvantage of high cost, and besides, the combustion value of ordinary clean fuel is limited, so the temperature of the combustion chamber is naturally limited, and thus the effect of eliminating smoke is also limited. SUMMARY

[0003] The present application is designed to solve the problems existing in the elimination of smoke by the existing combustion furnace. The plasma flame is introduced into the combustion furnace, and the fire uniformizing grate is arranged at the chimney opening, so that the plasma flame forms a curtain-shaped flame at this position, which completely burns all the passing smoke.

[0004] The specific technical scheme adopted to realize the present application is that the plasma flame is introduced into the combustion furnace, and the plasma flame ignites the high smoke solid fuel which is slowly and continuously added and burns the smoke generated by the high smoke solid fuel completely; the plasma flame is composed of a plasma generator main body and a plasma jet head; the combustion furnace is composed of a feeding hopper, a grate, a chimney, a fire uniformizing grate and a circulating liquid heat energy collecting device; the feeding port of the feeding hopper extends into the combustion chamber, the grate separates the combustion chamber and the slag chamber, the chimney is connected with the furnace wall at the chimney opening, the fire uniformizing grate is arranged at the chimney opening, the fire uniformizing grate is flat, a plurality of air holes are uniformly distributed on the fire uniformizing grate, the outer diameter of the fire uniformizing grate is equal to and fits the diameter of the chimney opening, the plane of the fire uniformizing grate covers the chimney opening, the circulating liquid heat energy collecting device is arranged in the hearth at the upper end of the combustion chamber, and the circulating liquid heat energy collecting device is arranged in the flue at the position close to the furnace wall of the chimney; the high smoke solid fuel is slowly and continuously fed into the combustion furnace through the feeding port of the feeding hopper, the plasma generator main body is turned on to generate the plasma flame, the plasma flame ignites the high smoke solid fuel instantaneously, the front end of the plasma flame is blocked by the fire uniformizing grate to form a curtain-shaped flame, the curtain-shaped flame completely covers the chimney opening, the curtain-shaped flame formed by the plasma flame intercepts and burns the smoke generated by the high smoke solid fuel at this position, and the remaining clean high-temperature gas enters the chimney through the air holes of the fire uniformizing grate and is discharged into the atmosphere.

[0005] The advantages of the technical scheme are: first, continuous dynamic feeding greatly reduces the space of the combustion chamber. In simple terms, the same space can reduce the combustion-supporting fuel (plasma flame energy consumption) by several times, or in other words, the same amount of combustion-supporting fuel can increase the burning time by several times. Second, the application uses plasma flame to burn smoke dust, and the flame temperature can reach about 8000 degrees, which is several times the temperature of ordinary flames, so the smoke dust is burned more thoroughly. Third, the application sets a uniform fire grate at the chimney opening to intercept and burn smoke dust, which can eliminate "leaked" smoke dust and has low energy consumption and high efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0006] Figure 1 is a schematic diagram of the principle of eliminating the smoke dust profile of high-smoke solid fuel by plasma flame combustion support.

[0007] Figure 2 is a schematic diagram of the principle of eliminating the smoke dust profile of high-smoke solid fuel by plasma flame combustion support while introducing ordinary fuel combustion support.

[0008] Figure 3 is a schematic diagram of the principle of a uniform fire grate.

[0009] Figure 4 is a schematic diagram of a smoke pipe circulating liquid heat energy collection device set at one end of the chimney.

[0010] In the figure, 1. Plasma flame, 2. Combustion furnace, 3. High-smoke solid fuel, 4. Smoke dust, 5. Plasma generator main body, 6. Plasma nozzle, 7. Hopper, 8. Grate, 9. Chimney, 10. Uniform fire grate, 11. Circulating liquid heat energy collection device, 12. Feeding port, 13. Slag chamber, 14. Furnace wall, 15. Chimney opening, 16. Air hole, 17. Circulating liquid heat energy collection device in the furnace, 18. Smoke pipe circulating liquid heat energy collection device, 19. Curtain-shaped flame, 20. Clean high-temperature gas, 21. Feeding motor, 22. Feeding valve, 23. Slag removal motor, 24. Slag removal connecting rod, 25. Ordinary flame nozzle. DETAILED DESCRIPTION

[0011] The application will be further described below in conjunction with the drawings.

[0012] In the figure, the feeding port 12 of the hopper 7 is provided with an automatic material control device, and the automatic material control device is mainly composed of a feeding motor 21 and a feeding valve 22 to control the slow and continuous addition of high-smoke solid fuel 3 into the combustion chamber 27.

[0013] The grate 8 is provided with an automatic slag removal device, and the automatic slag removal device is mainly composed of a slag removal motor 23 and a slag removal connecting rod 24. Through the mechanical shaking or rotation linkage of the slag removal motor 23 and the slag removal connecting rod 24, the ash is timely removed into the slag chamber 13 to ensure the combustion chamber.

[0014] Another design is that there are two flame nozzles, one is the plasma nozzle 6 and the other is the ordinary flame nozzle 25; the plasma nozzle 6 is opposite to the uniform fire grate 10, and the ordinary flame nozzle 25 is opposite to the high smoke solid fuel 3 in the combustion chamber 27; the flame of the ordinary flame nozzle 25 constantly ignites the high smoke solid fuel 3 entering the combustion chamber 27, and the plasma flame 1 of the plasma nozzle 6 burns the smoke dust 4 at the uniform fire grate 10 clean; the fuel used by the ordinary flame nozzle 25 is ordinary flammable liquid or gas, which is called ordinary flammable fuel 26. The ordinary flammable fuel 26 does not require clean fuel, only flammable, because the smoke dust is eventually burned by the plasma flame 1 through the uniform fire grate 10, so the smoke ignition fuel does not affect the effect of eliminating smoke dust, which is conducive to reducing cost.

[0015] Figure 1 In the method, the plasma flame 1 is introduced into the combustion furnace 2, and the plasma flame 1 ignites the high smoke solid fuel 3 added slowly and continuously and burns the smoke dust 4 generated by the high smoke solid fuel 3 clean; the plasma flame 1 is composed of the plasma generator main body 5 and the plasma nozzle 6; the combustion furnace 2 is composed of the hopper 7, the grate 8, the chimney 9, the uniform fire grate 10 and the circulating liquid heat energy collection device 11; the feeding port 12 of the hopper 7 extends into the combustion chamber 27, the grate 8 separates the combustion chamber 27 and the slag chamber 13, the chimney 9 is connected with the furnace wall 14 at the chimney port 15, the uniform fire grate 10 is arranged at the chimney port 15, the uniform fire grate 10 is a flat plate, a plurality of air holes 16 are uniformly distributed on the uniform fire grate 10, the outer diameter of the uniform fire grate 10 is equal to and fits the diameter of the chimney port 15, the plane of the uniform fire grate 10 covers the chimney port 15, the combustion chamber 27 has the in-furnace circulating liquid heat energy collection device 17 at the upper end, and the section of the chimney port 15 close to the furnace wall 14 has the flue circulating liquid heat energy collection device 18; the high smoke solid fuel 3 is slowly and continuously fed into the combustion furnace 2 through the feeding port 12 of the hopper 7, the plasma generator main body 5 is turned on to generate the plasma flame 1, the plasma flame 1 instantaneously ignites the high smoke solid fuel 3, the front end of the plasma flame 1 is blocked by the uniform fire grate 10 to form the curtain-shaped flame 19, the curtain-shaped flame 19 covers the chimney port 15 completely, the curtain-shaped flame 19 formed by the plasma flame 1 intercepts and burns the smoke dust 4 generated by the high smoke solid fuel 3 at this position, and the remaining clean high-temperature gas 20 enters the chimney 9 from the air holes 16 of the uniform fire grate 10 and is discharged into the atmosphere.

[0016] Figure 2 In the method, Figure 2 The difference is that, Figure 1 The difference is that, Figure 2In the embodiment, the flame spray head has two, which are plasma spray head 6 and ordinary flame spray head 25; the nozzle of the plasma spray head 6 is opposite to the uniform fire grate 10, and the nozzle of the ordinary flame spray head 25 is opposite to the high smoke solid fuel 3 in the combustion chamber 27; the flame of the ordinary flame spray head 25 constantly ignites the high smoke solid fuel 3 entering the combustion chamber 27, and the plasma flame 1 of the plasma spray head 6 burns the smoke dust 4 at the uniform fire grate 10 clean; the fuel used by the ordinary flame spray head 25 is ordinary flammable liquid or gas, which is called ordinary flammable fuel 26.

[0017] Figure 3 In the embodiment, Figure 3 is a schematic view of the uniform fire grate 10. The uniform fire grate 10 is a flat plate, and a plurality of air holes 16 are uniformly distributed on the uniform fire grate 10. The outer diameter of the uniform fire grate 10 is equal to and fits the diameter of the chimney opening 15, and the plane of the uniform fire grate 10 covers the chimney opening 15. The uniform fire grate 10 can have several deformations, such as being densely bundled with a plurality of tubular bodies, the outer periphery of which fits the chimney opening 15, and the hollow part of the tubular body corresponds to the air hole 16.

[0018] Figure 4 In the embodiment, a section of the chimney opening 15 near the furnace wall 14 has a smoke pipe circulating liquid heat energy collection device 18, which can be sleeved outside the chimney opening 15 or arranged inside the chimney opening 15, but a passage for the clean high-temperature gas 20 should be left.

[0019] The feed hopper can be arranged on the top of the furnace or on the side of the furnace; the chimney can be arranged on the side of the furnace or on the top of the furnace.

[0020] The high smoke solid fuel 3 mainly refers to, but is not limited to, combustible garbage fuel. The combustible garbage fuel is preferably pressed into shape, such as block-shaped garbage fuel and strip-shaped garbage fuel, which has mature technology and products on the market at present (currently used to supply power plants). The high smoke solid fuel 3 also includes high smoke low-quality coal and the like.

[0021] Since the hearth circulating liquid heat energy collection device, the smoke pipe circulating liquid heat energy collection device, the automatic feeding device, and the automatic slagging device belong to existing mature technology, they will not be described in detail here.

Claims

1. A method of eliminating smoke from high smoke solid fuel by plasma flame combustion support, characterized in that, In the combustion furnace, the plasma flame (1) is introduced into the chimney (15) where the uniform fire grate is arranged, the outer diameter of the uniform fire grate is equal to the diameter of the chimney, and the plane of the uniform fire grate covers the chimney. Turn on the plasma generator body to generate a plasma flame, the front end of the plasma flame is blocked by the uniform fire grate to form a curtain-shaped flame, the curtain-shaped flame covers the chimney, the flame curtain formed by the plasma flame traps and burns the smoke dust generated by the high smoke solid fuel, and the plasma flame is composed of the plasma generator body and the plasma nozzle.

2. The method of claim 1 wherein the high-ash solid fuel is coal. The flame nozzle has two, which are the plasma nozzle (6) and the ordinary flame nozzle (25); the nozzle of the plasma nozzle (6) is opposite to the uniform fire grate (10), and the nozzle of the ordinary flame nozzle (25) is opposite to the high smoke solid fuel (3) in the combustion chamber (27); the flame of the ordinary flame nozzle (25) constantly ignites the high smoke solid fuel (3) entering the combustion chamber (27), and the plasma flame (1) of the plasma nozzle (6) burns the smoke dust (4) at the uniform fire grate (10); the fuel used by the ordinary flame nozzle (25) is ordinary flammable liquid or gas, which is called ordinary flammable fuel (26).

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