Plasma preheating power plant boiler coupled with sludge co-firing device

Abstract

The invention discloses a plasma pre-pyrolysis power station boiler coupled sludge blending device, comprising: a sludge dryer, the sludge dryer having a sludge inlet and a sludge outlet; a coal mill, the coal mill is used to prepare mixed coal powder, the coal mill has a dry sludge inlet, a raw coal inlet and a coal powder outlet, the dry sludge inlet is connected to the sludge outlet, and the raw coal inlet is used to put raw coal; a high-temperature pre-combustion chamber, the high-temperature pre-combustion chamber is used to pre-pyrolyze the mixed coal powder to generate gaseous fuel, the high-temperature pre-combustion chamber has an inlet and an outlet, and the inlet is connected to the coal powder outlet; a boiler, the outlet of the high-temperature pre-combustion chamber is connected to the boiler to transport gaseous fuel to the boiler. According to the plasma pre-pyrolysis power station boiler coupled sludge blending device of the present invention, the operating efficiency of the boiler and the stability of the boiler combustion under low load can be improved, and the blending ratio of sludge can be increased, the original generation of nitrogen oxides in the boiler can be reduced, the impact on the environment can be reduced, and the air quality can be improved.

Description

Technical Field

[0001] The invention relates to the technical field of sludge co-combustion in pulverized coal boilers, and in particular to a plasma pre-pyrolysis power station boiler coupled sludge co-combustion device. Background Art

[0002] With the proposal of the "dual carbon" goal, the coal-fired power industry is under tremendous pressure to transform and upgrade. The "Action Plan for Low-carbon Transformation and Construction of Coal-fired Power (2024-2027)" clearly states that the coordinated disposal of sludge by large-scale pulverized coal boilers is one of the important measures to achieve pollution reduction and carbon reduction. At this stage, three technical routes have been implemented in engineering applications: direct blending of wet sludge, coupled blending of dried sludge, and blending of sludge gasification outside the furnace. However, each of the above technologies has its advantages and disadvantages, and the blending of sludge in power plant boilers is in a vigorous development stage, and various operation and maintenance measures and technical solutions are not comprehensive. In particular, the proportion of sludge blending is limited. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a plasma pre-pyrolysis power station boiler coupled sludge co-combustion device, which can improve the operating efficiency of the boiler and the stability of boiler combustion under low load, and at the same time can also increase the sludge co-combustion ratio, reduce the original generation of boiler nitrogen oxides, thereby reducing the emission of pollutants after boiler combustion, reducing the impact on the environment, and improving air quality.

[0004] According to the plasma prepyrolysis power station boiler coupled sludge co-combustion device of the present invention, the sludge co-combustion device includes: a sludge dryer, the sludge dryer has a sludge inlet and a sludge outlet; a coal pulverizer, the coal pulverizer is used to prepare mixed coal powder, the coal pulverizer has a dry sludge inlet, a raw coal inlet and a coal powder outlet, the dry sludge inlet is connected to the sludge outlet, and the raw coal inlet is used to put raw coal; a high-temperature precombustion chamber, the high-temperature precombustion chamber is used to prepyrolyze the mixed coal powder to generate gaseous fuel, the high-temperature precombustion chamber has an inlet and an outlet, the inlet is connected to the coal powder outlet; a boiler, the outlet of the high-temperature precombustion chamber is connected to the boiler to transport the gaseous fuel to the boiler.

[0005] According to the plasma prepyrolysis power station boiler coupled sludge co-combustion device of the present invention, by setting up a high-temperature precombustion chamber, the mixed coal powder can be converted into reducing gas and sent into the furnace of the boiler for combustion, thereby improving the operating efficiency of the boiler and the stability of boiler combustion under low load. At the same time, the sludge co-combustion device of the present application is no longer limited by the number of coal mill startups, thereby further improving the sludge co-combustion ratio; in addition, the original generation of nitrogen oxides in the boiler can be reduced, thereby reducing the emission of pollutants after boiler combustion, reducing the impact on the environment, and improving air quality.

[0006] According to some embodiments of the present invention, a plurality of plasma generators are provided in the high temperature pre-combustion chamber, and the plurality of plasma generators are arranged at intervals in the high temperature pre-combustion chamber.

[0007] According to some embodiments of the present invention, a gas burner is provided in the boiler, and the gas burner is used to ignite the gas fuel entering the boiler.

[0008] According to some embodiments of the present invention, there are multiple gas burners, and the multiple gas burners are arranged above the bottom burner of the boiler at intervals.

[0009] According to some embodiments of the present invention, the moisture content of the mixed coal powder entering the high-temperature pre-combustion chamber is less than 35%.

[0010] According to some embodiments of the present invention, the coal mill is a double-inlet and double-outlet coal mill or a medium-speed coal mill, and the coal mill has an air inlet, and the air inlet is used to provide air to the coal mill.

[0011] According to some embodiments of the present invention, the raw coal is anthracite.

[0012] According to some embodiments of the present invention, the method further comprises: a screw feeder, wherein the sludge dryer is connected to the coal mill via the screw feeder, and the power of the screw feeder is adjustable.

[0013] According to some embodiments of the present invention, the sludge co-combustion device also includes: a powder bin, which is connected between the coal mill and the high-temperature pre-combustion chamber, and is used to store the mixed coal powder; and a powder feeder, which is connected between the powder bin and the high-temperature pre-combustion chamber, and is used to feed the mixed coal powder in the powder bin into the high-temperature pre-combustion chamber.

[0014] According to some embodiments of the present invention, the boiler is a conventional square-tangent-circle or hedge boiler.

[0015] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of a plasma pre-pyrolysis power station boiler coupled with sludge co-combustion device according to an embodiment of the present invention.

[0017] Reference numerals:

[0018] 100. Plasma pre-pyrolysis power station boiler coupled sludge co-combustion device;

[0019] 10. Sludge drying machine; 11. Sludge inlet; 12. Sludge outlet;

[0020] 20. Screw feeder;

[0021] 30. Coal mill; 31. Dry sludge inlet; 32. Raw coal inlet; 33. Coal powder outlet; 34. Air inlet;

[0022] 40. High temperature pre-combustion chamber; 41. Plasma generator;

[0023] 50. Boiler; 51. Gas burner;

[0024] 60. Powder bin; 70. Powder feeder. DETAILED DESCRIPTION

[0025] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0026] Reference below Figure 1 A plasma pre-pyrolysis power station boiler coupled sludge co-combustion device 100 according to an embodiment of the present invention is described.

[0027] like Figure 1 As shown, according to an embodiment of the present invention, a plasma pre-pyrolysis power station boiler coupled sludge co-combustion device 100 comprises: a sludge dryer 10, a coal mill 30, a high-temperature pre-combustion chamber 40 and a boiler 50.

[0028] The sludge dryer 10 has a sludge inlet 11 and a sludge outlet 12, and is mainly used for drying wet sludge.

[0029] The coal mill 30 is used to prepare mixed coal powder. The coal mill 30 has a dry sludge inlet 3111, a raw coal inlet 32 ​​and a coal powder outlet 33. The dry sludge inlet 3111 is connected to the sludge outlet 12, and the raw coal inlet 32 ​​is used to put raw coal. It can be understood that the dry sludge and the raw coal can enter the coal mill 30 at the same time and be ground and mixed in the coal mill 30. It should be noted that the raw coal can be anthracite or ordinary coal.

[0030] The high temperature precombustion chamber 40 is used to preheat and demix the pulverized coal to generate gaseous fuel. The high temperature precombustion chamber 40 has an inlet and an outlet. The inlet is connected to the pulverized coal outlet 33; the outlet of the high temperature precombustion chamber 40 is connected to the boiler 50 to transport the gaseous fuel to the boiler 50.

[0031] Specifically, the gas generated after the mixed coal powder is pre-pyrolyzed in the high-temperature precombustion chamber 40 is mainly reducing gas containing CO and H2, wherein the gas is easy to burn. Then, the mixed coal powder is converted into reducing gas and sent into the furnace of the boiler 50 for combustion, which can improve the operating efficiency of the boiler 50 and the stability of the boiler 50 combustion under low load. At the same time, it can also make the sludge blending device of the present application no longer restricted by the number of coal mills 30 started, thereby further improving the sludge blending ratio. In addition, since the reducing gas combustion pollutants are relatively small, the original generation of nitrogen oxides in the boiler 50 can also be reduced, thereby reducing the emission of pollutants after the combustion of the boiler 50, reducing the impact on the environment, and improving the air quality.

[0032] Specifically, the wet sludge enters the sludge dryer 10 through the sludge inlet 11. The sludge dryer 10 can dry the wet sludge by auxiliary steam or the tail flue gas of the boiler 50 or electric heating. The dried sludge is transported to the coal mill 30. At the same time, the raw coal enters the coal mill 30 through the raw coal inlet 32. The coal mill 30 grinds the dry sludge and the raw coal to obtain mixed coal powder. When sludge is co-combusted or the unit needs to be temporarily operated at peak speed, the mixed coal powder is sent to the high-temperature precombustion chamber 40 for high-temperature precombustion. The mixed coal powder after high-temperature precombustion forms a gas raw material, and then the gas fuel is sent to the boiler 50 for combustion.

[0033] According to the plasma prepyrolysis power station boiler coupled sludge co-combustion device 100 of the embodiment of the present invention, by setting up a high-temperature precombustion chamber 40, the mixed coal powder can be converted into reducing gas and sent into the furnace of the boiler 50 for combustion, thereby improving the operating efficiency of the boiler 50 and the stability of the boiler 50 combustion under low load. At the same time, the sludge co-combustion device of the present application is no longer limited by the number of pulverizers 30 started, thereby further improving the sludge co-combustion ratio; in addition, the original generation of nitrogen oxides in the boiler 50 can be reduced, thereby reducing the emission of pollutants after combustion in the boiler 50, reducing the impact on the environment, and improving air quality.

[0034] According to some embodiments of the present invention, Figure 1 As shown, a plurality of plasma generators 41 are provided in the high temperature pre-combustion chamber 40, and the plurality of plasma generators 41 are arranged at intervals in the high temperature pre-combustion chamber 40. The high temperature plasma generated by the plasma generator 41 can make the temperature of the high temperature pre-combustion chamber 40 reach the combustion temperature required by the mixed coal more quickly, and can promote more complete combustion of the mixed coal, so that the plurality of plasma generators 41 are provided in the high temperature pre-combustion chamber 40, which can improve the overall combustion efficiency and the sufficiency of combustion.

[0035] In addition, since plasma is often at an extremely high temperature, the content and moisture of the raw coal in the mixed coal powder entering the high-temperature precombustion chamber 40 can meet the requirements of the plasma generator 41 to ignite the mixed coal powder. In this way, the proportion of sludge co-combustion will not be controlled, thereby achieving a large proportion of sludge co-combustion.

[0036] For example, the number of the plasma generators 41 may be two, three or more.

[0037] Optionally, the plasma generator 41 can be controlled individually, so that the required number of plasma generators 41 can be started according to the actual co-combustion requirements, so that the mixed coal powder can be completely converted into reducing gas and coke containing CO and H2. In this way, energy usage can be reduced while ensuring sufficient combustion of the fuel.

[0038] Optionally, the power of the plasma generator 41 in the high-temperature precombustion chamber 40 is adjustable, wherein the power of the plasma generator 41 can be adjusted according to the parameters of the mixed combustion, so that the mixed coal powder entering the high-temperature precombustion chamber 40 can be completely converted into combustible gas, avoiding unnecessary energy waste.

[0039] Optionally, the power of the sludge dryer 10 is adjustable, so that the sludge dryer 10 can adjust the moisture content of the dried sludge according to the coal quality parameters of the raw coal, thereby ensuring that the mixed combustion reaches the optimal parameters of plasma pre-combustion.

[0040] According to some embodiments of the present invention, Figure 1 As shown, a gas burner 51 is provided in the boiler 50, and the gas burner 51 is used to ignite the gas fuel entering the boiler 50. The gas burner 51 has a simple structure and low cost, and thus igniting the gas fuel in the boiler 50 using the gas burner 51 can reduce the production cost of the entire device.

[0041] According to some embodiments of the present invention, Figure 1 As shown, the number of gas burners 51 is multiple, and the multiple gas burners 51 are arranged above the bottom burner of the boiler 50 at intervals. In this way, the stable combustion capability of the boiler 50 under low load can be enhanced.

[0042] For example, the number of the gas burners 51 may be two, three or more.

[0043] It should be noted that the output power of the gas burner 51 is adjustable, so that the output power of the gas burner 51 can be adjusted according to the incoming gas fuel, thereby avoiding unnecessary energy waste.

[0044] According to some embodiments of the present invention, the moisture content of the mixed coal powder entering the high temperature pre-combustion chamber 40 is less than 35%. In this way, the mixed coal powder can be burned more fully in the high temperature pre-combustion chamber 40, thereby obtaining more gas fuel, thereby increasing the operating load of the boiler 50.

[0045] Optionally, the blending ratio of sludge and anthracite can be flexibly changed according to the amount entering the double-inlet and double-outlet coal mill 30, thereby changing the parameter characteristics of the mixed combustion to ensure that the moisture content of the mixed fuel is not higher than 35%.

[0046] According to some embodiments of the present invention, the coal mill 30 is a double-inlet and double-outlet coal mill 30 or a medium-speed coal mill 30, and the coal mill 30 has an air inlet 34, and the air inlet 34 is used to provide air to the coal mill 30. It can be understood that in some embodiments, the coal mill 30 is a double-inlet and double-outlet coal mill 30, and in other embodiments, the coal mill 30 is a medium-speed coal mill 30. Among them, the double-inlet and double-outlet coal mill 30 can feed from both ends and discharge from both ends at the same time, so that the use of the double-inlet and double-outlet coal mill 30 can improve the overall production efficiency; the medium-speed coal mill 30 usually uses rolling bearings instead of sliding bearings, with low friction, so the power consumption is relatively low, the energy efficiency is relatively high, and the floor space is small, so the use of the medium-speed coal mill 30 can reduce the floor space of the entire sludge blending and combustion device, so that the sludge blending and combustion device can be applied to factories with smaller sites.

[0047] Optionally, the air inlet 34 can provide primary air to the coal mill 30, wherein the primary air is mainly used for drying and conveying coal powder.

[0048] Optionally, the coal mill 30 may be an existing coal mill 30 of the boiler 50 , or may be a newly added coal mill 30 .

[0049] According to some embodiments of the present invention, the raw coal is anthracite. Anthracite has a high fixed carbon content and a low volatile matter. Therefore, the present embodiment uses anthracite as the raw coal, which can effectively improve the ignition performance of the overall fuel, making the combustion process more stable, while reducing the amount of raw coal used. At the same time, anthracite has a high calorific value, so it can effectively compensate for the low calorific value of sludge, thereby improving the combustion efficiency of mixed coal powder. In addition, anthracite usually has a low nitrogen and sulfur content, so less nitrogen oxides and sulfur dioxide are generated during the combustion process, and when it is mixed with sludge, it can effectively reduce the emission of total pollutants and reduce environmental pollution.

[0050] According to some embodiments of the present invention, Figure 1As shown, the sludge blending device also includes: a screw feeder 20, through which the sludge dryer 10 is connected to the coal mill 30, and the power of the screw feeder 20 is adjustable. In this way, the amount of sludge entering the coal mill 30 and the supply rate can be controlled, and then the fuel ratio can be adjusted according to the actual combustion requirements.

[0051] Optionally, when the raw coal is anthracite, the properties of the mixture of sludge and anthracite can be adjusted to be close to ordinary bituminous coal by controlling the power of the screw feeder 20, thereby improving the flammability of the mixed coal powder.

[0052] According to some embodiments of the present invention, Figure 1 As shown, the sludge blending and combustion device also includes: a powder bin 60 and a powder feeder 70, wherein the powder bin 60 is connected between the coal mill 30 and the high-temperature pre-combustion chamber 40, and the powder bin 60 is used to store mixed coal powder; specifically, the powder bin 60 is used to store mixed coal powder, so that the sludge blending and combustion device of the present application can be started and stopped at any time according to the source of sludge and the load of the unit. When the mixed coal powder is not needed, the coal powder can be temporarily stored in the powder bin 60, thereby avoiding waste or unnecessary treatment.

[0053] The powder feeder 70 is connected between the powder bin 60 and the high temperature pre-combustion chamber 40, and is used to feed the mixed coal powder in the powder bin 60 into the high temperature pre-combustion chamber 40. In this way, the continuity and stability of the coal powder supply can be ensured, which helps to maintain the efficient operation of the combustion process.

[0054] According to some embodiments of the present invention, the boiler 50 is a conventional tangential boiler 50 or an opposed boiler 50. It is understandable that the boiler 50 in this embodiment can be a conventional tangential boiler 50 or an opposed boiler 50, wherein these two types of boilers 50 are mature in design, reliable in technology, widely used, and can adapt to a variety of fuel types, thereby enabling the sludge blending and burning device of the present application to be applicable to many plant areas, thereby improving the applicability of the sludge blending and burning device of the present application.

[0055] It should be noted that in the prior art, when the raw coal is anthracite, due to its special combustion characteristics (high fixed carbon content, low volatile matter), it can only be mixed and burned using the W-flame boiler 50. In this embodiment, since the way the mixed fuel enters the furnace is changed, anthracite can be used without being restricted by the type of boiler 50, so that each power station can use the fuel mixed with anthracite and sludge without changing the boiler 50.

[0056] Reference below Figure 1 A plasma pre-pyrolysis power station boiler coupled sludge co-combustion device 100 according to an embodiment of the present invention is described.

[0057] Reference Figure 1The plasma pre-pyrolysis power station boiler coupled sludge co-combustion device 100 includes: a sludge dryer 10, a screw feeder 20, a coal mill 30, a powder bin 60, a powder feeder 70, a high-temperature pre-combustion chamber 40 and a boiler 50, wherein a plurality of plasma generators 41 are arranged in the high-temperature pre-combustion chamber 40, a plurality of gas burners 51 are arranged in the boiler 50, and the plurality of gas burners 51 are arranged at intervals above the bottom burner of the boiler 50.

[0058] Specifically, the sludge dryer 10 has a sludge inlet 11 for wet sludge and a sludge outlet 12 for discharging dry sludge; the inlet of the screw feeder 20 is connected to the sludge outlet 12 of the sludge dryer 10, and the outlet of the screw feeder 20 is connected to the dry sludge inlet 3111 of the coal mill 30, which is used to transport dry sludge into the coal mill 30; the output end of the coal mill 30 is a coal powder outlet 33, and the coal powder outlet 33 is connected to the powder bin 60. The coal mill 30 also has a raw coal inlet 32 ​​and a Secondary air inlet, wherein the raw coal inlet 32 ​​is used to provide raw coal to the pulverizer 30, and the primary air is used to air-dry the mixed coal powder, and the mixed coal powder is blown into the powder bin 60; the powder bin 60 conveys the mixed coal powder to the high-temperature pre-combustion chamber 40 through the feeder, and the mixed coal powder is ignited by the plasma generator 41 in the high-temperature pre-combustion chamber 40, and the mixed coal powder is burned to generate reducing gas fuel containing CO and H2 and coke, and the gas fuel is conveyed to the boiler 50 through the gas burner 51 and burns in the boiler 50.

[0059] The following describes the method of using the sludge co-combustion device of the present application.

[0060] First, wet sludge enters the sludge dryer 10 through the sludge inlet 11. The sludge dryer 10 dries the wet sludge by auxiliary steam or tail flue gas of the boiler 50 or electric heating. The dried sludge is transported to the coal mill 30 through the screw feeder 20. At the same time, the raw coal enters the coal mill 30 through the raw coal inlet 32. The coal mill 30 grinds the dry sludge and the raw coal to obtain mixed coal powder. The mixed coal powder is sent to the powder bin 60 through the primary wind for collection. When sludge co-combustion is carried out or the unit needs temporary peak operation, the powder feeder 70 is started to send the mixed coal powder in the powder bin 60 into the high-temperature precombustion chamber 40 for high-temperature precombustion. The mixed coal powder after high-temperature precombustion forms a reducing gas raw material containing CO and H2, and then the gas fuel is sent to the boiler 50 through the gas burner 51 and burned.

[0061] According to the plasma pre-pyrolysis power station boiler 50 coupled with the sludge blending device 100 of the embodiment of the present invention, by setting a high-temperature pre-combustion chamber 40, the mixed coal powder can be converted into reducing gas and sent into the furnace of the boiler 50 for combustion, thereby improving the operating efficiency of the boiler 50 and the stability of the combustion of the boiler 50 under low load, and at the same time, the original generation of nitrogen oxides in the boiler 50 can be reduced, thereby reducing the emission of pollutants after the combustion of the boiler 50, reducing the impact on the environment, and improving the air quality. In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, 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 cannot be understood as limiting the present invention.

[0062] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0063] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0064] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0065] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A plasma pre-pyrolysis power station boiler coupled sludge co-combustion device, characterized in that: include: A sludge dryer, wherein the sludge dryer has a sludge inlet and a sludge outlet; A coal mill, the coal mill is used to prepare mixed coal powder, the coal mill has a dry sludge inlet, a raw coal inlet and a coal powder outlet, the dry sludge inlet is connected to the sludge outlet, and the raw coal inlet is used to put raw coal; A high temperature pre-combustion chamber, the high temperature pre-combustion chamber is used for pre-pyrolyzing the mixed coal powder to generate gaseous fuel, the high temperature pre-combustion chamber has an inlet and an outlet, the inlet is connected to the coal powder outlet; The outlet of the high-temperature pre-combustion chamber is connected to the boiler to transport the gas fuel to the boiler.

2. The plasma pre-pyrolysis power station boiler coupled sludge co-combustion device according to claim 1 is characterized in that: A plurality of plasma generators are disposed in the high-temperature pre-combustion chamber, and the plurality of plasma generators are arranged at intervals in the high-temperature pre-combustion chamber.

3. The plasma pre-pyrolysis power station boiler coupled sludge co-combustion device according to claim 1 is characterized in that: A gas burner is provided in the boiler, and the gas burner is used to ignite the gas fuel entering the boiler.

4. The plasma pre-pyrolysis power station boiler coupled sludge co-combustion device according to claim 3 is characterized in that: There are multiple gas burners, and the multiple gas burners are arranged above the bottom burner of the boiler at intervals.

5. The plasma pre-pyrolysis power station boiler coupled sludge co-combustion device according to claim 1 is characterized in that: The moisture content of the mixed coal powder entering the high-temperature pre-combustion chamber is less than 35%.

6. The plasma pre-pyrolysis power station boiler coupled sludge co-combustion device according to claim 1 is characterized in that: The coal mill is a double-inlet and double-outlet coal mill or a medium-speed coal mill. The coal mill has an air inlet, and the air inlet is used to provide air to the coal mill.

7. The plasma pre-pyrolysis power station boiler coupled sludge co-combustion device according to claim 1 is characterized in that: The raw coal is anthracite.

8. The plasma pre-pyrolysis power station boiler coupled sludge co-combustion device according to any one of claims 1 to 7, characterized in that: Also includes: A screw feeder, the sludge dryer is connected to the coal mill through the screw feeder, and the power of the screw feeder is adjustable.

9. The plasma pre-pyrolysis power station boiler coupled sludge co-combustion device according to any one of claims 1 to 7, characterized in that: Also includes: A powder bin, the powder bin is connected between the coal mill and the high-temperature pre-combustion chamber, and the powder bin is used to store the mixed coal powder; A powder feeder is connected between the powder bin and the high-temperature pre-combustion chamber, and is used to feed the mixed coal powder in the powder bin into the high-temperature pre-combustion chamber.

10. The plasma pre-pyrolysis power station boiler coupled sludge co-combustion device according to claim 1, characterized in that: The boiler is a conventional four-corner tangent circle or hedge boiler.

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