CN214840828U - Control system for flue dynamic air distribution and SNCR (selective non-catalytic reduction) denitration - Google Patents
Control system for flue dynamic air distribution and SNCR (selective non-catalytic reduction) denitration Download PDFInfo
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Abstract
The utility model provides a flue developments air distribution control system of SNCR denitration in coordination. The control system consists of a sensing unit, an execution unit and an adjusting unit; what is needed isThe sensing unit comprises temperature, NO concentration and NH3And the execution unit comprises a secondary air execution layer, an over-fire air execution layer and an SNCR execution layer. The control system detects parameters through the sensing unit, generates a control instruction through analysis of the adjusting unit, and dynamically regulates and controls the air distribution state and the reducing agent spraying state through the execution unit, so that the uniform distribution of the flue temperature is realized, the generation of NOx is reduced, the SNCR denitration efficiency is improved, and the control system can be widely applied to the technical field of denitration of garbage incinerators.
Description
Technical Field
The utility model belongs to rubbish low nitrogen low dioxin burning and flue gas denitration field especially relates to a flue developments air distribution control system of SNCR denitration in coordination.
Background
With the acceleration of the urbanization process in China, the classification of urban garbage is proposed, and to the implementation of the construction scheme of a waste-free city, the urban garbage is increased rapidly due to the upgrading of the urban industry and the improvement of the quality of life, the heat value of the garbage is also increased, and the garbage incineration power generation becomes the main technology for treating the urban domestic garbage in China. According to statistics, the average heat value of the garbage in 2018 in the long triangle and bead triangle areas is higher than that of the domestic garbage in other areas in China, and the heat value of the garbage fed into the furnace is generally higher than 7500 kJ/kg. As the heat value of the household garbage is greatly increased, the smoke temperature of the boiler is obviously increased, the corrosion of the heating surface of the boiler is aggravated, the burning of the furnace wall of the incinerator is frequent, and particularly, the pouring material of the incinerator is frequently maintained at the front arch of the secondary air burner.
The nitrogen oxides generated in the waste incineration process comprise NO and NO2、N2O、N2O3、N2O4And N2O5Etc., wherein NO accounts for 90-95% of the total nitrogen oxides produced. NOxThe generation mechanism mainly comprises 3 types of thermal type, fuel type and rapid type, the highest temperature is 1450-1650K according to the combustion characteristic of the garbage incinerator when the garbage incinerator is stably operated, and the rapid type NO isxIs very small, mainly fuel type NOxMore than 80% in percentage, and then thermal NOxNot more than 20%. Experiments show that with increasing reaction temperature, NOxThe rate of the formation reaction increases exponentially. When the temperature exceeds 1700K, the temperature increases every time100K, the reaction rate is increased by 6-7 times. Therefore, controlling the incineration temperature in the incinerator is an effective measure to achieve low nitrogen combustion.
Dioxin is a colorless, odorless, and severely toxic fat-soluble substance that can damage various organs and systems. The main approach for generating dioxin by burning municipal solid wastes is that the burning temperature can not reach more than 850 ℃ and the burning time can not reach more than 2s in the burning process of chlorine-containing plastics such as vinyl chloride and the like, and the chlorine-containing wastes are not completely burned.
To control NOxAnd dioxin is generated, pollutants are reduced from the source, patent CN201210510370 proposes that four layers of blowing assemblies are arranged on a first channel of a garbage incinerator to form two groups of tangent circles so as to enable smoke to rise spirally, and patent CN20110250190 proposes that two layers of over-fire air nozzles are arranged at the bottom of a hearth of the incinerator to enable the smoke to rise spirally so as to prolong the combustion residence time of the smoke and the combustion of low-nitrogen and low-dioxin. In the existing technology for controlling the layered air distribution of the garbage incinerator, no method for combining the vertical vortex formed by flue gas through secondary air downward blowing and the horizontal vortex formed by horizontal rotational flow blowing is considered, and the combined blowing mode is applied to improving the SNCR denitration efficiency and controlling the corrosion of the SNCR reducing agent on the water wall.
The air inlet amount is distributed to the garbage incinerator through secondary air and over-fire air in a grading way, under the condition that the original excess air coefficient level is kept, the flue gas in a flue is more uniformly combusted and distributed, the corrosion condition of a secondary air combustor and the heating surface of the flue is reduced, the incineration temperature in the incinerator is effectively controlled, and NO is reducedxThe method can also properly widen the SNCR reaction temperature area, increase the turbulence in the furnace, increase the retention time of the flue gas at 850 ℃ and reduce the generation of dioxin.
When the SNCR method is adopted for flue gas denitration, an area with the flue gas temperature of 850-. And adopting SNCR method to denitrate, generally atomizing the reducing agent in liquid form and then spraying into the furnace to denitrate,depending to a large extent on the atomisation effect of the reducing agent and the degree of mixing of the reducing agent with the flue gas. Patent CN109464900B calculates the elevation of the optimal reaction area and further moves the lance by the linear relationship of the elevation and the temperature, but the application of the movable lance has great difficulty in the installation and design of the lance. The secondary air and the over-fire air are distributed in a grading way, so that the flue gas in the first flue is more uniformly combusted and distributed, the combustion temperature of a fixed SNCR spray gun arrangement area can be ensured to be between 850 and 1100 ℃ to the maximum extent, the SNCR reducing agent spray gun is arranged between two over-fire air layers, the high turbulence between the over-fire air layers is effectively utilized to realize the rapid mixing of the reducing agent and the flue gas, and NH (nitrogen-sulfur) at the position close to the wall surfaces of the water-cooled walls on the four sides above the SNCR spray gun layers is utilized3The corrosion of the reducing agent to the water wall can be reduced by the detection and analysis of the concentration and the adjustment of the angle of the over-fire air gun.
However, in the prior art, the flue gas is unevenly distributed in the high-temperature combustion area and NO exists in the local high-temperature combustion areaxThe generation amount is large, the combustion temperature of an SNCR denitration area is difficult to control, and the mixing uniformity of flue gas and reducing agent is insufficient, so that the efficiency is low.
SUMMERY OF THE UTILITY MODEL
The utility model discloses to counter-flow grate waste incinerator, the utility model provides an utilize under the overgrate air to blow, the low dioxin burning that the classified air distribution of over-fire air combines with the SNCR denitration, the waste incineration control system of high-efficient SNCR denitration, through the overgrate air, the classified dynamic adjustment of over-fire air distribution volume, realize perpendicular and the mobile mixture of horizontal vortex, increase the interior flue gas turbulence degree of stove and control combustion temperature and realize the low dioxin burning of low nitrogen, guarantee the regional reaction temperature of SNCR denitration simultaneously, improve SNCR denitration effect and reduce the corruption of reductant to the water-cooling wall, but wide application in low nitrogen burning and SNCR denitration technical field.
The utility model discloses at least, one of following technical scheme realizes.
A control system for flue dynamic air distribution and SNCR denitration comprises a sensing unit, an adjusting unit and an executing unit;
the sensing unit comprises a temperature and concentration detection module for real-time detectionMonitoring the detection information of the temperature of the flue gas in the furnace, the detection information of the concentration of NO and NH3Concentration detection information is transmitted to the adjusting unit;
the adjusting unit analyzes and judges the detection parameters transmitted by the sensing unit to generate a control instruction for the executing unit;
the execution unit comprises a secondary air execution layer, an over-fire air execution layer and an SNCR execution layer, and each execution layer is regulated and controlled according to the control instruction transmitted by the adjusting unit.
Preferably, the temperature concentration detection module detects the temperature of the flue gas, the concentration of NO and NH3A number of sensors of the concentration of the liquid,
the sensor is disposed within the incinerator.
Preferably, the incinerator comprises a grate, a hearth, a secondary air burner, a first flue, a second flue and a third flue; a primary air inlet is arranged below the fire grate; the hearth is positioned above the fire grate;
the secondary air burner is positioned above the hearth, and the first flue is positioned above the secondary air burner; the second flue inlet is connected with the first flue outlet; the third flue inlet is connected with the second flue outlet;
an over-fire air gun arrangement area is formed between the secondary air burner and the first flue outlet; at least two layers and more than two layers of over-fire air layers are arranged in the over-fire air gun arrangement area at intervals; the over-fire air gun arrangement area is provided with an SNCR spray gun arrangement area, the SNCR spray gun arrangement area is arranged in an area with the smoke temperature of 850-1100 ℃, and is positioned between two over-fire air layers, and a plurality of SNCR spray gun layers are arranged in the SNCR spray gun arrangement area.
Preferably, the sensors are respectively arranged at the first flue inlet, between the first flue inlet and the first layer of over-fire air layer, between every two layers of over-fire air layers and between the over-fire air layers and the SNCR spray gun layers, and the sensor for detecting the concentration of NH3 is arranged at the four-side water-cooled wall above each layer of SNCR spray gun layer and the first flue outlet.
Preferably, in the arrangement area of the over-fire air guns, one over-fire air layer is arranged at intervals of 2-3m, and one or a plurality of air blowing assemblies are arranged on the four water cooling walls of each over-fire air layer.
Preferably, the secondary air execution layer comprises an air blowing assembly, the air blowing assembly comprises a plurality of rows of secondary air guns, a flow control valve and a first signal regulator, the secondary air guns, the flow control valve and the secondary air guns are positioned on the front wall and the rear wall of the secondary air burner, the first signal regulator is connected with a first secondary air draught fan, the two rows of air guns on the front wall and the rear wall of the secondary air guns are arranged in a staggered mode, and the included angle between the downward blowing angle of each row of secondary air guns and the horizontal plane is 20-45 degrees;
the overfire air execution layer comprises a flow control valve and a second signal regulator, the flow control valve is connected with each layer of overfire air gun, the output power of the secondary air draught fan is regulated according to the control instruction of the regulating unit, and the regulation of the overfire air distribution volume is realized.
Preferably, the SNCR execution layer includes a reducing agent flow control valve, an atomized medium control valve and a third signal regulator, and the reducing agent flow control valve and the atomized medium control valve are respectively installed between the reducing agent and the atomized medium delivery pipe and the inner and outer interfaces of each layer of SNCR spray gun; the third signal regulator is connected with the input end of the compressor, and the output end of the compressor is respectively connected with the reducing agent and the atomized medium conveying pipeline.
Preferably, the overfire air layer is uniformly supplied with air by a secondary air induced draft fan, namely a secondary air distribution system is used for distributing partial secondary air to the overfire air, or an independent induced air system is configured for supplying air.
Preferably, the adjustable range of the included angle between each air gun of the over-fire air layer and the water-cooled wall is 30-50 degrees.
Preferably, the arrangement height of the SNCR spray gun is selected according to the smoke temperature of 850-.
Compared with the prior art, the utility model following beneficial effect has:
(1) the utility model discloses carryThe discharged combustion control system uses garbage to burn efficiently and with low pollution, and reduces NO in burning from sourcexThe secondary air is blown downwards to form local vertical vortex flow above the secondary air of the front wall, and the horizontal vortex flow of the flue gas is driven by matching with the over-fire air layer to realize the mixing of the local vertical vortex flow flue gas and the upward flow flue gas, so that the retention time of the flue gas in a high-temperature area is prolonged, the flue gas is more uniformly mixed, the combustion is more sufficient, and the denitration effect is better;
(2) the water-cooled wall protection air film is formed on the upper portion of the first flue by adding the burnout air layer, so that the water-cooled wall on the upper portion of the first flue, the top furnace wall of the first flue, the bent angle of the outlet of the first flue and the furnace wall of the inlet of the second flue are effectively prevented from being washed by flue gas.
Drawings
Fig. 1 is a block diagram of a control system for flue dynamic air distribution and SNCR denitration according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram in an embodiment of the present invention;
fig. 3a is a schematic view of a flow field of a numerical simulation result in an embodiment of the present invention;
fig. 3b is a schematic view of a flow field of a numerical simulation result of increasing the over-fire air layer in the embodiment of the present invention;
fig. 4a is a schematic diagram of a temperature field contour line of a numerical simulation result in an embodiment of the present invention;
FIG. 4b is a schematic view of a temperature field contour line of a numerical simulation result of an overfire air layer according to an embodiment of the present invention;
reference numerals: 1. a grate; 2. a hearth; 3. a secondary air burner; 4. a first flue; 5. a second flue; 6. a third flue; 7. arching the rear of the hearth; 8. a secondary air gun; 9. an over-fire air gun arrangement area; an SNCR lance placement area; 11. a first flue outlet; 12. a third flue outlet.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.
In the description of the present invention, it should be understood that the orientation or positional relationship indicated with respect to the orientation description, such as up, down, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does 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 thus, should not be construed as limiting the present invention.
In the description of the present invention, a plurality of means are one or more, a plurality of means are two or more, and the terms greater than, less than, exceeding, etc. are understood as not including the number, and the terms greater than, less than, within, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present invention, unless there is an explicit limitation, the words such as setting, installation, connection, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in combination with the specific contents of the technical solution.
As shown in fig. 1, the present embodiment provides a control system for flue dynamic air distribution and SNCR denitration, which includes a sensing unit, an adjusting unit, and an executing unit;
the sensing unit comprises a temperature concentration detection module for monitoring the smoke temperature detection information, the NO concentration detection information and the NH in the furnace in real time3Concentration detection information is transmitted to the adjusting unit;
the adjusting unit analyzes and judges the detection parameters transmitted by the sensing unit to generate a control instruction for the executing unit;
the execution unit comprises a secondary air execution layer, an over-fire air execution layer and an SNCR execution layer, and each execution layer is regulated and controlled according to the control instruction generated by the adjusting unit.
The temperature concentration detection module comprises a smoke temperature detection module, a NO concentration detection module and a NH detection module3A plurality of sensors of concentration, the sensors are respectively arranged in the incinerator.
The incinerator comprises a fire grate 1, a hearth 2, a secondary air burner 3, a first flue 4, a second flue 5 and a third flue 6; a primary air inlet is arranged below the fire grate 1; the hearth 2 is positioned above the fire grate 1;
a hearth rear arch 7 is arranged on the hearth 2; the secondary air burner 3 is positioned above the hearth 2, and the first flue 4 is positioned above the secondary air burner 3; the inlet of the second flue 5 is connected with the outlet of the first flue 4; the inlet of the third flue 6 is connected with the outlet of the second flue 5.
An over-fire air gun arrangement area 9 is formed between the secondary air burner 3 and the outlet of the first flue 4; at least two and more than two layers of over-fire air layers are arranged in the over-fire air gun arrangement area 9 at intervals; the SNCR spray gun arrangement area 10 is positioned in the over-fire air gun arrangement area 9, is arranged in an area with the smoke temperature of 850-1100 ℃, and is optionally provided with one or more layers.
The sensors are respectively arranged at the inlet of the first flue 4, between the inlet of the first flue 4 and the first layer of over-fire air layer, between every two layers of over-fire air layers and between the over-fire air layers and the SNCR spray gun layer to detect NH3Sensors for concentration are placed on the four waterwalls above each layer of SNCR lances and at the outlet of first flue 4.
As shown in fig. 2, garbage enters the upper part of the fire grates through the feeding port, primary air is blown in from the primary air inlet below each stage of fire grates 1, and the garbage is heated by the primary air, gas phase combustion radiation and counter-current flue gas at the rear part of the fire grates in the hearth to complete four processes of moisture evaporation, devolatilization, volatile combustion and fixed carbon burnout. Under the limitation of the rear arch 7, the furnace flue gas reversely flows into the secondary air burner 3 along the angle of the rear arch 7. The secondary air guns 8 of the front wall and the rear wall downwards form an included angle of 20-45 degrees with the horizontal plane, and blow in a hedging manner, under the action of secondary air, smoke is gathered and combusted in the middle of a secondary air combustor, rises along the first flue 4 and gradually disperses, negative pressure is formed in the area above the secondary air of the front wall and the rear wall, as a flue outlet is positioned on one side of the rear wall, a flow field tends to be stable, the smoke is more inclined to rise along the rear wall, as shown in fig. 3a, local large vertical vortexes are generated above the secondary air of the front wall, and local small vertical vortexes are formed above the secondary air of the rear wall.
The overgrate air carries out the layer and is used for adjusting the air distribution volume of the subassembly of blowing on the overgrate air combustor 3 front and back wall, the subassembly of blowing is including several rows overgrate air rifle 8, flow control valve and the first signal conditioner on being located the overgrate air combustor front and back wall, flow control valve is connected with several rows overgrate air rifle 8 for adjust the air output of overgrate air rifle, first signal conditioner is connected with first overgrate air draught fan, according to the control command of regulating unit, adjusts the output of overgrate air draught fan, realizes the regulation of overgrate air distribution volume. The two rows of secondary air guns 8 on the front wall and the rear wall are arranged in a staggered manner, and the downward blowing angle of each row of secondary air guns and the included angle of the horizontal plane are between 20 and 45 degrees.
The over-fire air layer is arranged in a region 9 between the secondary air burner 3 and an outlet of the first flue 4, one over-fire air layer is arranged at intervals of 2-3m, one or more blowing assemblies are arranged on four water-cooled walls at the same height, which are arranged at the over-fire air arrangement position of each layer, and the adjustable range of the included angle between an over-fire air gun and the water-cooled walls in the over-fire air execution layer is 30-50 degrees and is used for adjusting the combustion state and the mixing state of a reducing agent and flue gas. The flue gas forms horizontal vortex flow above the first flue under the drive of the over-fire air, the local vertical vortex flow flue gas above the secondary air combustor 3 is mixed with ascending flue gas, and an enclosing air layer is formed on the upper part of the first flue 4, so that the flue gas is effectively gathered and combusted in the middle area of the flue.
The overfire air layer is uniformly supplied with air by a secondary air induced draft fan, namely a secondary air distribution system is used for distributing partial secondary air to the overfire air; the air supply can also be carried out by configuring an independent induced air system.
The overfire air execution layer comprises a flow control valve and a second signal regulator, the flow control valve is connected with each layer of overfire air gun and used for regulating the air output of the overfire air gun, the second signal regulator is connected with a second secondary air draught fan, the output power of the secondary air draught fan is regulated according to a control instruction of a regulating unit, and the regulation of the overfire air distribution quantity is realized.
The SNCR execution layer controls a reducing agent flow control valve, an atomized medium control valve and a third signal regulator, and the reducing agent flow control valve and the atomized medium control valve are respectively arranged between the reducing agent and the atomized medium conveying pipeline and the inner interface and the outer interface of each layer of SNCR spray gun and are used for regulating the flow of the reducing agent, the flow of the atomized medium and the pressure. The third signal regulator is connected with the input end of the compressor, the output end of the compressor is respectively connected with the reducing agent and the atomized medium conveying pipeline, and the output power of the compressor is regulated according to the control instruction of the regulating unit, so that the flow and the pressure of the SNCR spray gun are regulated.
The start cycle of perception unit adjust according to actual operating condition demand, the temperature of perception unit, NO concentration detection sensor arrange in burn-off air gun arrange regional 9 among, arrange specifically in first flue 4 entrance, between first flue 4 entrance and the first layer burn-off air layer, between every two-layer burn-off air, burn-off air layer and SNCR spray gun layer, detect NH3Sensors for concentration are placed on the four waterwalls above each layer of SNCR lances and at the outlet of the first flue 4.
According to the temperature and NO concentration at different elevations in the furnace detected by the sensing unit, the adjusting unit analyzes and judges by comparing the detection parameters with the set limit value, calculates the air distribution conditions of secondary air and over-fire air, generates a control instruction and further transmits the control instruction to the executing unit.
Through the verification of numerical simulation, the flow field and the temperature field when the over-fire air layer is not added are shown in fig. 3a and 4a, and the flow field and the temperature field after the over-fire air layer is added are shown in fig. 3b and 4 b. In fig. 3b, the flow field of the first flue is uniformly distributed, the flue gas flow in the central area of the flue is the largest, and in fig. 3a, the phenomenon that the flue gas rises close to the rear wall when the over-fire air is added is obviously improved, and the phenomenon that the flue gas at the inlet of the second flue erodes the rear wall is also obviously improved; from fig. 4, the temperature distribution of the flue gas is greatly related to the flow field distribution, the high-temperature area of fig. 4a is close to the rear wall of the first flue, the high-temperature area of fig. 4b is concentrated in the center of the flue, and the temperature distribution of fig. 4b can be analyzed to be more uniform according to the density degree of the contour lines. The arrows in fig. 3a represent the secondary air blowing direction, the over-fire air blowing direction, and the two large arrows in fig. 3a represent the flue gas forming a vertical vortex flow under the influence of the down-blowing secondary air. The arrows in fig. 3b indicate the general arrangement of overfire/overfire air.
In summary, the control system of the garbage incinerator is feasible through numerical simulation. Compared with the existing control system, the control system for the waste incinerator flue dynamic regulation and control air distribution cooperated with SNCR denitration at least has the following advantages:
(1) the automatic regulation of different air distribution amounts and the SNCR reducing agent injection amount under the variable conditions of different load working conditions, different fuel heat values and the like is met, the temperature of the SNCR denitration area of the first flue can be controlled to be between 850 ℃ and 1100 ℃ through the dynamic regulation and control of the secondary air and over-fire air distribution ratio and the sectional multi-time detection parameter correction control instruction, the temperature of the SNCR denitration area of the first flue is ensured to reach the standard, and meanwhile, the thermal NO is reducedxIs generated. Further, by selecting a proper SNCR spray gun layer and controlling the distribution proportion of the reducing agent, the ammonia escape is reduced, and the using amount of the reducing agent is saved.
(2) Two over-fire air layers are arranged above and below the SNCR spray gun, the reducing agent and the flue gas are fully mixed by controlling the air quantity of the over-fire air, the denitration efficiency can be improved to the maximum degree, and NH is arranged on the water-cooled walls on four sides above the SNCR spray gun layers and close to the wall surface3The distribution condition of the reducing agent in the flue is detected and analyzed by concentration, the adjustment of the inlet-blowing angle of the over-fire air gun is corrected, and the corrosion of the reducing agent to the water-cooled wall can be effectively avoided.
The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be equivalent replacement modes, and all are included in the scope of the present invention.
Claims (8)
1. A control system for flue dynamic air distribution and SNCR denitration is characterized by comprising a sensing unit, an adjusting unit and an executing unit;
the sensing unit comprises a temperature concentration detection module for monitoring the smoke temperature detection information, the NO concentration detection information and the NH in the furnace in real time3Concentration detection information is transmitted to the adjusting unit;
the execution unit comprises a secondary air execution layer, an over-fire air execution layer and an SNCR execution layer, and each execution layer is regulated and controlled according to the control instruction transmitted by the regulating unit;
the adjusting unit comprises a first signal adjuster, a second signal adjuster and a third signal adjuster;
the secondary air execution layer comprises an air blowing assembly, the air blowing assembly comprises a plurality of rows of secondary air guns (8) and flow control valves, the secondary air guns (8) are positioned on the front wall and the rear wall of the secondary air burner, the flow control valves are connected with the plurality of rows of secondary air guns (8), the first signal regulator is connected with a first secondary air induced draft fan, the two rows of air guns on the front wall and the rear wall of the secondary air guns (8) are arranged in a staggered mode, and the downward blowing angle of each row of secondary air guns and the included angle of the horizontal plane are between 20 and 45 degrees;
the over-fire air execution layer comprises a flow control valve, and the flow control valve is connected with each layer of over-fire air guns; the second signal regulator is connected with a second secondary air induced draft fan;
the SNCR execution layer comprises a reducing agent flow control valve, an atomized medium control valve and a third signal regulator, wherein the reducing agent flow control valve and the atomized medium control valve are respectively arranged between the reducing agent and the atomized medium conveying pipeline and the inner and outer interfaces of each layer of SNCR spray gun; the third signal regulator is connected with the input end of the compressor, and the output end of the compressor is respectively connected with the reducing agent and the atomized medium conveying pipeline.
2. The system as claimed in claim 1, wherein the temperature concentration detection module comprises a module for detecting flue gas temperature, NO concentration, NH3A plurality of sensors of concentration, the sensors being arranged in the incinerator.
3. The control system for flue dynamic air distribution and SNCR denitration according to claim 2, wherein the incinerator comprises a fire grate (1), a hearth (2), a secondary air burner (3), a first flue (4), a second flue (5) and a third flue (6); a primary air inlet is arranged below the fire grate (1); the hearth (2) is positioned above the fire grate (1);
the secondary air burner (3) is positioned above the hearth (2), and the first flue (4) is positioned above the secondary air burner (3); the inlet of the second flue (5) is connected with the outlet of the first flue (4); the inlet of the third flue (6) is connected with the outlet of the second flue (5);
an over-fire air gun arrangement area (9) is formed between the secondary air burner (3) and the outlet of the first flue (4); at least two layers and more than two layers of over-fire air layers are arranged in the over-fire air gun arrangement area (9) at intervals; an SNCR spray gun arrangement area (10) is arranged in the over-fire air gun arrangement area (9), the SNCR spray gun arrangement area (10) is arranged in an area with the flue gas temperature of 850-.
4. The control system of claim 3, wherein the sensors are respectively arranged at the inlet of the first flue (4), between the inlet of the first flue (4) and the first layer of over-fire air layer, between each two layers of over-fire air layers and between the over-fire air layers and the SNCR spray gun layers, and the sensor for detecting the concentration of NH3 is arranged at the four water-cooled walls above each SNCR spray gun layer and the outlet of the first flue (4).
5. The control system for flue dynamic air distribution and SNCR denitration according to claim 4, wherein in the over-fire air gun arrangement area (9), an over-fire air layer is arranged at intervals of 2-3m, and one or more blowing assemblies are arranged on four water-cooled walls of each over-fire air layer.
6. The system for controlling dynamic air distribution and SNCR denitration of the flue according to claim 5, wherein the overfire air layer is uniformly supplied by a secondary air induced draft fan, namely a secondary air distribution system is used to distribute part of the secondary air to the overfire air, or an independent induced draft system is configured for air supply.
7. The control system of claim 6, wherein the control system comprises a flue, a dynamic air distribution system and an SNCR denitration system, and is characterized in that: the adjustable range of the included angle between each air gun of the over-fire air layer and the water-cooled wall is 30-50 degrees.
8. The control system of claim 7, wherein the arrangement height of the SNCR spray guns is selected according to the flue gas temperature of 850-1100 ℃, and the SNCR spray guns are arranged between two layers of over-fire air layers, and at least more than two SNCR spray guns are arranged on each layer.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114543100A (en) * | 2022-02-10 | 2022-05-27 | 华南理工大学 | Furnace coupling removal system for secondary pollutants of garbage incinerator and control method |
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