Sludge blending combustion device coupled with plasma pre-pyrolysis power station boiler

Abstract

The utility model discloses a plasma pre-pyrolysis power station boiler coupling sludge blending combustion device which comprises a sludge drying machine, a plasma pre-pyrolysis power station boiler coupling sludge blending combustion device and a plasma pre-pyrolysis power station boiler coupling sludge blending combustion device, the coal mill is used for preparing mixed pulverized coal, the coal mill is provided with a dry sludge inlet, a raw material coal inlet and a pulverized coal outlet, the dry sludge inlet is connected with the sludge outlet, and the raw material coal inlet is used for feeding raw material coal; the high-temperature pre-combustion chamber is used for pre-heating and unmixing the mixed pulverized coal to generate gas fuel, the high-temperature pre-combustion chamber is provided with an inlet and an outlet, and the inlet is communicated with the pulverized coal outlet; and an outlet of the high-temperature pre-combustion chamber communicates with the boiler so as to convey gas fuel to the boiler. According to the plasma preheating power station boiler coupling sludge blending combustion device, the operation efficiency of the boiler and the stability of boiler combustion under low load can be improved, the blending combustion proportion of sludge can be increased, the original generation amount of boiler nitric oxide is reduced, the influence on the environment is reduced, and the air quality is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of coal powder boiler mixed burning sludge, especially to a kind of plasma pyrolysis power station boiler coupling sludge mixed burning device. BACKGROUND

[0002] At present, there are three technical routes of wet sludge direct mixed burning, dried sludge coupling mixed burning and sludge off-stove gasification mixed burning to realize engineering application. The above-mentioned various technologies have advantages and disadvantages, and power station boiler mixed burning sludge is in the vigorous development stage, and various operation and maintenance measures and technical schemes are not comprehensive. Especially, the sludge mixed burning ratio is limited. CONTENT OF UTILITY MODEL

[0003] The utility model aims at at least one of the technical problems existing in prior art. To this end, the utility model provides a kind of plasma pyrolysis power station boiler coupling sludge mixed burning device, which can improve the operation efficiency of boiler and the stability of boiler combustion under low load, and also can improve the mixed burning ratio of sludge, reduce the original generation amount of boiler nitrogen oxides, so as to reduce the emission amount of pollutants after boiler combustion, reduce the influence on environment, improve air quality.

[0004] According to the plasma pyrolysis power station boiler coupling sludge mixed burning device of the utility model, the sludge mixed burning device includes: sludge dryer, the sludge dryer has sludge inlet and sludge outlet;Coal mill, the coal mill is used to prepare mixed coal powder, the coal mill has dry sludge inlet, raw coal inlet and coal powder outlet, the dry sludge inlet is connected with the sludge outlet, and the raw coal inlet is used to put raw coal;High-temperature precombustion chamber, the high-temperature precombustion chamber is used to pyrolyze the mixed coal powder to generate gaseous fuel, the high-temperature precombustion chamber has inlet and outlet, and the inlet is communicated with the coal powder outlet;Boiler, the outlet of the high-temperature precombustion chamber is communicated with the boiler to convey the gaseous fuel to the boiler.

[0005] According to the plasma pyrolysis power station boiler coupling sludge mixed burning device of the utility model, by setting high-temperature precombustion chamber, mixed coal powder can be converted into reducing gas and sent into the furnace of boiler for combustion, thereby the operation efficiency of boiler and the stability of boiler combustion under low load can be improved, and the sludge mixed burning device of the application can not be limited by the number of coal mill start, thereby the mixed burning ratio of sludge can be further improved;In addition, the original generation amount of boiler nitrogen oxides can be reduced, so as to reduce the emission amount of pollutants after boiler combustion, reduce the influence on environment, improve air quality.

[0006] According to some embodiments of the utility model, a plurality of plasma generators are arranged in the high-temperature precombustion chamber.

[0007] According to some embodiments of the present application, the gas burner is arranged 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 application, the number of the gas burners is multiple, and the multiple gas burners are arranged above the lowermost burner of the boiler.

[0009] According to some embodiments of the present application, 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 application, the coal mill is a double-in double-out coal mill or a medium-speed coal mill, and the coal mill has an air inlet for providing air to the coal mill.

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

[0012] According to some embodiments of the present application, further comprising: a screw feeder, the screw feeder is connected to the coal mill through the sludge dryer, and the power of the screw feeder is adjustable.

[0013] According to some embodiments of the present application, the sludge blending device further comprises: a powder bin connected between the coal mill and the high-temperature pre-combustion chamber, the powder bin is used to store the mixed coal powder; and a powder feeder connected between the powder bin and the high-temperature pre-combustion chamber, the powder feeder is used to send the mixed coal powder in the powder bin into the high-temperature pre-combustion chamber.

[0014] According to some embodiments of the present application, the boiler is a conventional four-corner tangent or opposed boiler.

[0015] Additional aspects and advantages of the present application will be partially given in the following description, partially will become obvious from the following description, or will be understood by the practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a schematic diagram of a plasma pre-pyrolysis power station boiler coupled sludge blending device according to embodiments of the present application.

[0017] REFERENCE NUMERALS:

[0018] 100, plasma pre-pyrolysis power station boiler coupled sludge blending device;

[0019] 10, sludge dryer; 11, sludge inlet; 12, sludge outlet;

[0020] 20, screw feeder;

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

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

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

[0024] 60. Powder hopper; 70. Powder feeder. Detailed Implementation

[0025] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0026] The following is for reference. Figure 1 Description of a plasma preheating and decomposition power plant boiler coupled sludge co-firing device 100 according to an embodiment of the present invention.

[0027] like Figure 1 As shown, according to an embodiment of the present invention, a plasma preheating and decomposition power plant boiler coupled sludge co-firing device 100 includes: 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 blended pulverized coal. The coal mill 30 has a dry sludge inlet 3111, a raw coal inlet 32, and a pulverized coal outlet 33. The dry sludge inlet 3111 is connected to the sludge outlet 12, and the raw coal inlet 32 ​​is used to feed raw coal. It can be understood that dry sludge and raw coal can enter the coal mill 30 simultaneously and be ground and blended within it. It should be noted that the raw coal can be anthracite or ordinary coal.

[0030] The high-temperature pre-combustion chamber 40 is used to preheat and demixed pulverized coal to generate gaseous fuel. The high-temperature pre-combustion chamber 40 has an inlet and an outlet. The inlet is connected to the pulverized coal outlet 33. The outlet of the high-temperature pre-combustion chamber 40 is connected to the boiler 50 to supply gaseous fuel to the boiler 50.

[0031] Specifically, the gas generated after the mixed coal powder is preheated in the high-temperature precombustion chamber 40 is mainly reducing gas containing CO and H2, wherein the gas is easy to burn, and 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 operation efficiency of the boiler 50 and the stability of the boiler 50 under low load, and at the same time, the sludge blending device of the present application is not limited by the number of the coal mills 30 started, and thus the sludge blending ratio can be further improved. In addition, since the reducing gas has relatively less pollutants, the original generation amount of nitrogen oxides of the boiler 50 can be reduced, thereby reducing the emission amount of pollutants after the boiler 50 is burned, reducing the impact on the environment, and improving air quality.

[0032] Specifically, the wet sludge enters the sludge dryer 10 through the sludge inlet 11, and the sludge dryer 10 can dry the wet sludge by auxiliary steam or boiler 50 tail flue gas or electric heating. The dried sludge is transported to the coal mill 30, and the raw coal enters the coal mill 30 through the raw coal inlet 32. The coal mill 30 grinds the dried sludge and the raw coal to obtain mixed coal powder. When the sludge blending or temporary peak operation of the unit is performed, the mixed coal powder is sent to the high-temperature precombustion chamber 40 for high-temperature precombustion, and the mixed coal powder after high-temperature precombustion forms gas raw material, and then the gas fuel is sent to the boiler 50 for combustion.

[0033] According to the plasma preheating and pyrolysis power station boiler coupled sludge blending device 100, by arranging the 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 operation efficiency of the boiler 50 and the stability of the boiler 50 under low load, and at the same time, the sludge blending device of the present application is not limited by the number of the coal mills 30 started, and thus the sludge blending ratio can be further improved. In addition, the original generation amount of nitrogen oxides of the boiler 50 can be reduced, thereby reducing the emission amount of pollutants after the boiler 50 is burned, reducing the impact on the environment, and improving air quality.

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

[0035] In addition, since the plasma is usually at a very high temperature, the content of raw coal and moisture in the mixed coal powder entering the high-temperature precombustion chamber 40 can meet the requirement that the plasma generator 41 can ignite the mixed coal powder, so that the proportion of sludge blending can not be controlled, and large-scale sludge blending can be realized.

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

[0037] Optionally, the plasma generators 41 can be controlled individually, so that the number of the plasma generators 41 required can be started according to the actual blending requirement, so that the mixed coal powder can be completely converted into reducing gas containing CO and H2 and coke, so that the fuel can be fully combusted while reducing the use of energy.

[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, and unnecessary energy waste can be avoided.

[0039] Optionally, the power of the sludge drying machine 10 is adjustable, so that the sludge drying machine 10 can adjust the moisture content of the dried sludge according to the coal quality parameters of the raw coal, and the optimal parameters of the mixed combustion can be ensured.

[0040] According to some embodiments of the present application, as shown in Figure 1 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 the use of the gas burner 51 to ignite the gas fuel in the boiler 50 can reduce the production cost of the whole device.

[0041] According to some embodiments of the present application, as shown in Figure 1 The number of the gas burners 51 is multiple, and the multiple gas burners 51 are arranged above the lowermost layer of the burners of the boiler 50. In this way, the stable combustion capability of the boiler 50 under low load can be improved.

[0042] For example, the number of the gas burners 51 can 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 entering gas fuel, and unnecessary energy waste can be avoided.

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

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

[0046] According to some embodiments of the present application, the coal mill 30 is a double-in double-out coal mill 30 or a medium-speed coal mill 30, and the coal mill 30 has an air inlet 34 for providing air to the coal mill 30. It can be understood that, in some embodiments, the coal mill 30 is a double-in double-out coal mill 30, and in other embodiments, the coal mill 30 is a medium-speed coal mill 30. Among them, the double-in double-out coal mill 30 can simultaneously feed from both ends and discharge from both ends, so that the use of the double-in double-out coal mill 30 can improve the overall production efficiency; the medium-speed coal mill 30 usually uses rolling bearings instead of sliding bearings, so the friction is small, and thus the power consumption is relatively low, the energy efficiency is relatively high, and the floor area is small, so that the use of the medium-speed coal mill 30 can reduce the floor area of the entire sludge blending device, so that the sludge blending 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 the coal powder.

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

[0049] According to some embodiments of the present application, the raw coal is anthracite. Among them, the anthracite has a high fixed carbon content and a low volatile matter, so that in this embodiment, the anthracite is used as the raw coal, which can effectively improve the ignition performance of the overall fuel, make the combustion process more stable, and also reduce the use amount of the raw coal; at the same time, the anthracite has a high calorific value, so that the deficiency of the low calorific value of the sludge can be effectively compensated, and thus the combustion efficiency of the mixed coal powder can be improved. In addition, the nitrogen and sulfur content of the anthracite is usually low, so that the production of nitrogen oxides and sulfur dioxide in the combustion process is less, and thus when blended with the sludge, the total pollutant emission can be effectively reduced, and the environmental pollution can be reduced.

[0050] According to some embodiments of the present application, as shown in FIG. 1, Figure 1As shown, the sludge blending device further comprises: a screw feeder 20, the sludge dryer 10 is connected with the coal mill 30 through the screw feeder 20, and the power of the screw feeder 20 is adjustable. In this way, the amount and the feeding rate of the sludge entering the coal mill 30 can be controlled, and then the fuel ratio can be adjusted according to the actual combustion demand.

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

[0052] According to some embodiments of the present application, Figure 1 As shown, the sludge blending device further comprises: 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 for storing the mixed coal powder; specifically, the powder bin 60 is used for storing the mixed coal powder, so that the sludge blending device of the present application can be started and stopped at any time according to the source of the sludge and the unit load condition, and 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 for feeding 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, thereby helping to maintain the efficient operation of the combustion process.

[0054] According to some embodiments of the present application, the boiler 50 is a conventional four-corner tangential boiler 50 or a opposed firing boiler 50. It can be understood that the boiler 50 in the present embodiment can be a conventional four-corner tangential boiler 50 or an opposed firing boiler 50, wherein the two types of boilers 50 are mature in design, reliable in technology, widely used, and can adapt to various fuel types, so that the sludge blending device of the present application can be applicable in many plants, thereby improving the applicability of the sludge blending 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), only W-flame boiler 50 can be used for blending. In the present embodiment, since the way of mixed fuel entering the furnace is changed, anthracite can be used without being limited by the type of boiler 50, so that each power station can use the fuel mixed with sludge without replacing the boiler 50.

[0056] Hereinafter, with reference to Figure 1 The sludge blending device 100 coupled with the plasma pre-pyrolysis power station boiler according to the embodiments of the present application is described.

[0057] Referring toFigure 1 The sludge incineration device 100 coupled with the plasma pre-pyrolysis power station boiler comprises 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 the high-temperature pre-combustion chamber 40 is provided with a plurality of plasma generators 41, and the boiler 50 is provided with a plurality of gas burners 51, which are arranged at intervals above the lowermost layer of burners of the boiler 50.

[0058] Specifically, the sludge dryer 10 is provided with a sludge inlet 11 for wet sludge and a sludge outlet 12 for dry sludge; the inlet of the screw feeder 20 is connected with the sludge outlet 12 of the sludge dryer 10, and the outlet of the screw feeder 20 is connected with a dry sludge inlet 3111 of the coal mill 30 for conveying dry sludge into the coal mill 30; the coal mill 30 is provided with a raw coal inlet 32 for supplying raw coal into the coal mill 30 and a primary air inlet, and the coal mill 30 is further provided with a coal powder outlet 33 connected with the powder bin 60; the powder bin 60 conveys mixed coal powder into the high-temperature pre-combustion chamber 40 through the powder feeder, and the mixed coal powder is ignited by the plasma generators 41 in the high-temperature pre-combustion chamber 40 to generate reducing gas fuel containing CO and H2 and coke, and the gas fuel is conveyed into the boiler 50 by the gas burners 51 and combusted in the boiler 50.

[0059] The use method of the sludge incineration device of the present application is described below.

[0060] Firstly, wet sludge enters the sludge dryer 10 through the sludge inlet 11, and the sludge dryer 10 dries the wet sludge by auxiliary steam or boiler 50 tail flue gas or electric heating, and the dried sludge is conveyed to the coal mill 30 by the screw feeder 20, while the raw coal enters the coal mill 30 through the raw coal inlet 32, and the coal mill 30 grinds the dry sludge and the raw coal to obtain mixed coal powder, which is collected in the powder bin 60 by primary air, and when the sludge incineration or the temporary peak operation of the unit is required, the powder feeder 70 is started to convey the mixed coal powder in the powder bin 60 into the high-temperature pre-combustion chamber 40 for high-temperature pre-combustion, and the mixed coal powder after high-temperature pre-combustion forms reducing gas fuel containing CO and H2, which is then conveyed into the boiler 50 by the gas burners 51 and combusted.

[0061] The sludge mixing and burning device 100 is coupled with the plasma pre-pyrolysis power station boiler 50, the high-temperature pre-combustion chamber 40 is arranged, the mixed coal powder can be converted into reducing gas and sent into the furnace of the boiler 50 for combustion, the operation efficiency of the boiler 50 and the stability of the boiler 50 under low load can be improved, the original generation amount of nitrogen oxides of the boiler 50 can be reduced, the emission amount of pollutants after the boiler 50 is burned can be reduced, the influence on the environment can be reduced, and the air quality can be improved.

[0062] In addition, the terms "first", "second", "third", "fourth", "fifth", "sixth", "seventh" and "eight" are only used for descriptive purpose, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second", "third", "fourth", "fifth", "sixth", "seventh" and "eight" can explicitly or implicitly include one or more of the features.

[0063] In the utility model, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting", "fixing" and the like should be understood in a broad sense, for example, can be fixed connection, can be detachable connection, or integral; can be mechanical connection, can be electrical connection, or communication; can be directly connected, or indirectly connected through an intermediate medium; can be the communication or interaction relationship between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0064] In the description of the present specification, the description referring to the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. Furthermore, the person skilled in the art can combine and combine the different embodiments or examples described in the present specification and the features of the different embodiments or examples, without mutual contradiction.

[0065] Although the embodiments of the present application have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A sludge blending and burning device coupled to a plasma pre-pyrolysis power station boiler, characterized in that, The application relates to a sludge drying machine, a coal mill, a high-temperature precombustion chamber and a boiler. The sludge drying machine has a sludge inlet and a sludge outlet. The coal mill is used for preparing mixed coal powder, and has a dry sludge inlet, a raw coal inlet and a coal powder outlet. The dry sludge inlet is connected with the sludge outlet. The raw coal inlet is used for feeding raw coal.

2. The coupled sludge co-combustion device of a plasma pre-decomposed power station boiler according to claim 1, characterized in that, The high-temperature precombustion chamber is used for pyrolyzing the mixed coal powder to generate gas fuel.

3. The coupled sludge co-combustion device of a plasma pre-decomposed power station boiler according to claim 1, characterized in that, The high-temperature precombustion chamber has an inlet and an outlet.

4. The coupled sludge co-combustion device of a plasma pre-decomposed power station boiler according to claim 3, characterized in that, The outlet of the high-temperature precombustion chamber is connected with the boiler to deliver the gas fuel to the boiler.

5. The coupled sludge co-combustion device of a plasma pre-pyrolysis power plant boiler according to claim 1, characterized in that, A plurality of plasma generators are arranged in the high-temperature precombustion chamber.

6. The coupled sludge co-combustion device of a plasma pre-pyrolysis power plant boiler according to claim 1, characterized in that, The boiler is provided with a gas burner for igniting the gas fuel entering the boiler.

7. The coupled sludge co-combustion device of a plasma pre-pyrolysis power plant boiler according to claim 1, characterized in that, The number of the gas burners is multiple.

8. The coupled sludge co-combustion device of a plasma pre-pyrolysis power plant boiler according to any one of claims 1-7, characterized in that, The gas burners are arranged above the lowermost burners of the boiler. The moisture content of the mixed coal powder entering the high-temperature precombustion chamber is less than 35%.

9. The coupled sludge co-combustion device of a plasma pre-pyrolysis power plant boiler according to any one of claims 1-7, 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 for providing air to the coal mill. The raw coal is anthracite.

10. The coupled sludge co-combustion device of a plasma pre-pyrolysis power plant boiler according to claim 1, characterized in that, Further provided are: A screw feeder connected between the sludge drying machine and the coal mill. The power of the screw feeder is adjustable. Further provided are: A powder bin connected between the coal mill and the high-temperature precombustion chamber. The powder bin is used for storing the mixed coal powder. A powder feeder connected between the powder bin and the high-temperature precombustion chamber. The boiler is a conventional four-corner tangential or opposed boiler.

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