Clean combustion device of waste incineration power plant

Abstract

The utility model provides a clean combustion device of a waste incineration power plant, which relates to the technical field of waste combustion treatment devices and is characterized in that a quantitative feeder is arranged below a waste feed hopper, and a fire grate is arranged at the output end of the quantitative feeder in a step shape; a plurality of primary air supply ducts are arranged in an air chamber below the fire grate, a combustion cavity is formed at the top of the fire grate and is communicated with a flue cavity, and two sides of a throat part of the combustion cavity are connected with secondary air supply pipes; a monitoring assembly is arranged below the outlet of the flue cavity, the rear arch wall of the combustion cavity and the fire grate and is in signal connection with a control system. The technical problems that in the prior art, an air supply part is in a fixed mode, the air volume cannot be adjusted in real time, and sufficient combustion cannot be achieved are solved. The technical effects that the combustion process is optimized in real time, the combustion efficiency is improved, pollutant emission is reduced, energy consumption during low-load operation is reduced, the maintenance frequency of a fire grate system is reduced, and the reliability of the system is improved are achieved.

Description

Technical Field

[0001] This utility model relates to the technical field of waste incineration treatment devices, and in particular to a clean combustion device for a waste incineration power plant. Background Technology

[0002] In the waste-to-energy industry, the combustion unit is the core equipment, and its performance directly determines the power generation efficiency and environmental protection level. The combustion unit of a waste-to-energy plant undertakes the crucial task of fully burning waste, releasing heat energy, and converting it into electricity. It needs to process municipal solid waste with complex composition and diverse properties. This waste comes from a wide range of sources, including kitchen waste, plastics, paper, metals, and other materials, placing demands on the adaptability and stability of the combustion unit.

[0003] Currently, the air supply system in waste-to-energy plants is mostly based on a fixed mode, delivering air to the furnace through simple pipes and valves, making it difficult to precisely adjust the air volume according to the real-time needs of waste combustion. The grate is usually a mechanical grate, composed of multiple fixed or movable grate plates. During waste incineration, the grate moves at a fixed speed and in a fixed manner, propelling the waste to burn gradually within the furnace.

[0004] In existing air supply systems, due to the complex composition and large fluctuations in calorific value of waste, the fixed-mode and intensity of air supply cannot detect changes in the combustion state of the waste in real time, making it difficult to provide the right amount of air to meet combustion requirements. When the air volume is insufficient, the waste cannot burn completely, resulting in energy waste; when the air volume is excessive, it will carry away a large amount of heat, which will also reduce combustion efficiency. Utility Model Content

[0005] The purpose of this invention is to provide a clean combustion device for waste incineration power plants, so as to alleviate the technical problem in the prior art where the air supply intensity is fixed, resulting in the inability to adjust the air volume in real time and thus incomplete combustion.

[0006] This utility model provides a clean combustion device for a waste incineration power plant, including a waste feed hopper, a metering feeder, a grate, a combustion chamber, a primary air supply duct, a secondary air supply pipe, a flue chamber, a monitoring component, and a control system.

[0007] A metering feeder is arranged below the waste feed hopper, and the output end of the metering feeder is arranged in a stepped grate.

[0008] Several primary air supply ducts are provided in the air chamber below the grate. A combustion chamber is formed at the top of the grate. The combustion chamber is connected to the flue chamber. Secondary air supply pipes are connected to both sides of the throat of the combustion chamber. Monitoring components are installed at the outlet of the flue chamber, the rear arch wall of the combustion chamber, and below the grate. The signals of the monitoring components are connected to the control system.

[0009] Furthermore, the monitoring components include an oxygen concentration sensor located at the outlet of the flue gas duct, a thermal imager located on the rear arch wall of the combustion chamber, and a temperature sensor located below the grate. The oxygen concentration sensor, thermal imager, and temperature sensor are all connected to the control system signal.

[0010] Furthermore, the angle α between the geothermal imager and the vertical line of the ground is 15° to 20°.

[0011] Furthermore, the grate includes a drying section, a combustion section, and a burnout cooling section that are inclined downwards at 15° to 20° in sequence;

[0012] The bottom of the drying section has one air chamber connected to one primary air supply duct, the bottom of the combustion section has three air chambers connected to three primary air supply ducts, and the bottom of the burnout cooling section has two air chambers connected to two primary air supply ducts.

[0013] Furthermore, each primary air supply duct is equipped with a control valve, and multiple primary air supply ducts are connected to a single ventilation pipe.

[0014] Furthermore, the air chamber at the bottom end of the burnout cooling section is connected to a combustion-supporting pipe, which is filled with oxygen at a concentration of 28% to 30%.

[0015] Furthermore, the grate surface includes fixed grate bars and movable grate bars that are stacked at intervals in a stepped shape;

[0016] Both the fixed grate bars and the movable grate bars are coated with a ceramic coating.

[0017] Furthermore, the moving speed of the drying section, combustion section, and burnout cooling section is 0.5 m / h to 2.5 m / h.

[0018] Furthermore, the outlet of the secondary air supply duct is equipped with a swirling nozzle, and the nozzle velocity of the swirling nozzle is 20m / s to 35m / s.

[0019] Beneficial effects:

[0020] This utility model provides a clean combustion device for a waste incineration power plant, including a metering feeder arranged below the waste feed hopper, and a grate arranged in a stepped manner at the output end of the metering feeder; several primary air supply ducts are provided in the air chamber below the grate, a combustion chamber is formed at the top of the grate, the combustion chamber is connected to the flue chamber, and secondary air supply pipes are connected to both sides of the throat of the combustion chamber; monitoring components are provided at the outlet of the flue chamber, the rear arch wall of the combustion chamber, and below the grate, and the signals of the monitoring components are connected to the control system.

[0021] By independently controlling the air chambers below the grate and combining this with monitoring components at the rear arch of the combustion chamber, infrared thermal imaging of the grate provides feedback on the combustion status of the waste layer, offering a detailed view of the waste combustion situation inside the furnace. The airflow in each area is adjusted according to the actual situation. Temperature sensors are installed below the grate to monitor the dryness of the waste entering the furnace and changes in combustion stability in real time. Based on these parameters, the grate speed and damper size are adjusted. An oxygen concentration sensor is installed at the outlet of the flue gas duct to quickly and accurately assess the intensity of the oxidation reaction during combustion inside the furnace.

[0022] Secondary air supply is connected to both sides of the combustion chamber throat to send air into the furnace. The nozzles are angled downwards at 15° to create turbulence at the furnace throat, which prolongs the residence time of the flue gas and ensures complete combustion.

[0023] This invention achieves real-time optimization of the combustion process by monitoring and increasing secondary air supply, and by using grate infrared thermal imaging, thereby improving combustion efficiency, reducing pollutant emissions, reducing energy consumption during low-load operation, reducing the maintenance frequency of the grate system, and improving system reliability. Attached Figure Description

[0024] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0025] Figure 1 A schematic diagram of the clean combustion device for a waste incineration power plant provided in an embodiment of this utility model;

[0026] Figure 2 A schematic diagram of the monitoring components in a clean combustion device for a waste-to-energy power plant, provided as an embodiment of this utility model;

[0027] Figure 3 A schematic diagram of the thermal imager and grate in a clean combustion device for a waste-to-energy power plant, provided as an embodiment of this utility model.

[0028] Icons: 1 - Waste feed hopper; 2 - Metering feeder; 3 - Grate; 301 - Drying section; 302 - Combustion section; 303 - Combustion cooling section; 304 - Combustion aid pipe; 4 - Combustion chamber; 5 - Primary air supply duct; 501 - Control valve; 502 - Ventilation pipe; 6 - Secondary air supply duct; 601 - Swirl nozzle; 7 - Flue chamber; 8 - Monitoring components; 801 - Oxygen concentration sensor; 802 - Thermal imager; 803 - Temperature sensor; 9 - Control system. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0031] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0032] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0033] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0034] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0035] The following detailed description, in conjunction with the accompanying drawings, outlines some embodiments of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0036] like Figure 1 , Figure 2 and Figure 3 As shown, this utility model embodiment provides a clean combustion device for a waste incineration power plant; including: a waste feed hopper 1, a metering feeder 2, a grate 3, a combustion chamber 4, a primary air supply duct 5, a secondary air supply pipe 6, a flue chamber 7, a monitoring component 8, and a control system 9;

[0037] A metering feeder 2 is arranged below the waste feed hopper 1, and a grate 3 is arranged in a stepped manner at the output end of the metering feeder 2.

[0038] Several primary air supply ducts 5 are provided in the air chamber below the grate 3. A combustion chamber 4 is formed at the top of the grate 3. The combustion chamber 4 is connected to the flue chamber 7. Secondary air supply pipes 6 are connected to both sides of the throat of the combustion chamber 4. Monitoring components 8 are provided at the outlet of the flue chamber 7, the rear arch wall of the combustion chamber 4, and below the grate 3. The signals of the monitoring components 8 are connected to the control system 9.

[0039] Specifically, the waste feed hopper 1 is the initial inlet for waste entering the combustion device. Made of stainless steel, it possesses excellent corrosion resistance, resisting the erosion of various corrosive substances in the waste and extending its service life. Its shape is a funnel, wider at the top and narrower at the bottom. The larger top opening can accommodate a large amount of waste, facilitating waste dumping, while the narrower bottom outlet guides the waste to flow towards the metering feeder 2, effectively preventing waste accumulation and blockage within the feed hopper. The metering feeder 2, located below the waste feed hopper 1, controls the amount of waste entering the grate 3. Controlling the conveying mechanism of the metering feeder 2 ensures that an appropriate amount of waste is evenly delivered onto the grate 3. The output end of the metering feeder 2 is designed in a stepped shape, adapting to the structure of the grate 3. This ensures that the waste is distributed on the grate 3 according to a certain pattern and interval, preventing waste from accumulating in one area and ensuring uniform distribution on the grate 3, creating favorable conditions for subsequent complete combustion.

[0040] The grate 3 adopts a conventional stepped grate, with the grate bars in direct contact with the fuel. Ventilation gaps between the bars facilitate air entry for combustion. The transmission mechanism, driven by an electric motor and reducer, moves the grate bars to achieve continuous combustion of the waste. The grate 3 is located at the output end of the metering feeder 2 and is arranged in a stepped pattern. This arrangement helps the waste slide and distribute naturally under gravity, allowing for more complete contact with air and providing a good material basis for the combustion process. The grate 3 is divided into multiple independent drive sections, each section further divided into multiple air chambers. Each air chamber is connected to a corresponding primary air supply duct 5, enabling precise air supply according to the combustion needs of each section. For example, for waste with a high calorific value, the grate movement speed can be appropriately increased to avoid over-combustion; for waste with a low calorific value, the grate movement speed can be reduced to prolong the residence time of the waste on the grate, ensuring complete combustion.

[0041] The combustion chamber 4 is located at the top of the grate 3 and is the main space for waste combustion. The combustion chamber 4 is connected to the flue chamber 7, and the high-temperature flue gas generated by waste combustion is discharged from the system through the flue chamber 7.

[0042] A monitoring component 8 is installed at the outlet of flue gas chamber 7 to monitor various components in the flue gas in real time, such as oxygen concentration, CO, and NOx. This monitoring data is crucial for evaluating combustion efficiency and controlling pollutant emissions, providing strong data support for subsequent adjustments to the combustion process. An infrared thermal imaging system within the monitoring component 8 is installed on the rear arch wall of combustion chamber 4. Based on the combustion status of the waste layer fed back by the infrared thermal imaging, the airflow in each air chamber is precisely controlled. For example, when the infrared thermal imaging shows incomplete combustion in a certain area, the control system can automatically increase the airflow in the corresponding air chamber to promote combustion. A temperature sensor within the monitoring component 8 is installed below grate 3 to monitor the drying status of the incoming waste and changes in combustion stability in real time. Based on these parameters, the grate speed and damper size are adjusted.

[0043] With stable feeding via the metering feeder 2, the stepped arrangement, segmented drive, and flexible adjustment of the grate 3, and precise control of the air supply system, waste can fully contact air and achieve efficient combustion within the combustion chamber 4. Independent compartmentalized control of the primary air and airflow regulation based on infrared thermal imaging, along with turbulent mixing of the secondary air and oxygen-enriched combustion assistance in the burnout section, greatly promote the combustion process and significantly improve combustion efficiency.

[0044] The efficient combustion process ensures more complete waste combustion, reducing the generation of pollutants such as CO and unburned carbon. Simultaneously, real-time monitoring of flue gas composition by monitoring component 8, combined with timely adjustments by control system 9, effectively controls the emission of pollutants such as NOx, ensuring the overall system's emissions meet environmental protection requirements. Control system 9 adjusts the air supply and grate 3 motion parameters in real time based on combustion status information fed back by monitoring component 8. During low-load operation, it precisely matches the air supply to the waste combustion demand, avoiding excessive air supply that leads to increased energy consumption, thus reducing energy consumption during low-load operation and improving the system's economic efficiency.

[0045] It should be noted that grate 3 adopts a conventional stepped grate 3, sufficient to transport waste. Grate 3 includes a frame, grate bars, and a transmission mechanism; the frame is the supporting structure of the grate, used to fix the grate bars and other components, maintaining their stable shape and position. The grate bars are the components that directly contact the fuel and participate in the combustion process; their shape is strip-shaped, plate-shaped, or sheet-shaped, with necessary ventilation gaps maintained between the bars to allow air to enter the fuel layer for combustion. The transmission mechanism is used to drive the movement of the grate bars, enabling the fuel to move gradually on the grate for continuous combustion. It includes a transmission system composed of sprockets, chains, eccentric wheels, connecting rods, and push rods, powered by an electric motor, reducer, etc., and the speed can be adjusted as needed.

[0046] In an embodiment of this utility model, the monitoring component 8 includes an oxygen concentration sensor 801 arranged at the outlet of the flue duct 7, a thermal imager 802 arranged on the rear arch wall of the combustion chamber 4, and a temperature sensor 803 arranged below the grate 3. The oxygen concentration sensor 801, the thermal imager 802, and the temperature sensor 803 are all connected to the control system 9 via signals.

[0047] The angle α between the thermal imager 802 and the vertical line of the ground is 15° to 20°.

[0048] Specifically, the oxygen concentration sensor 801 is located at the outlet of the flue gas cavity 7 and is used to monitor the oxygen content in the flue gas after combustion, providing real-time data on the oxygen concentration. In the entire combustion system, oxygen concentration is a crucial indicator of combustion completeness. The oxygen concentration sensor 801 can quickly and accurately transmit the detected oxygen concentration information to the control system 9 in the form of an electrical signal, providing a basis for the system to judge combustion efficiency and adjust the air supply. When the oxygen concentration is too high, it means there may be excess air, and the control system 9 will correspondingly reduce the primary and secondary air supply to avoid energy waste; if the oxygen concentration is too low, the air supply will be increased to ensure complete combustion.

[0049] The thermal imager 802 is mounted on the rear arch wall of the combustion chamber 4, with the angle α between it and the vertical line to the ground set between 15° and 20°. This specific angle setting allows the thermal imager 802 to comprehensively and clearly capture the combustion status of the waste on the grate 3 within the combustion chamber. Utilizing infrared thermal imaging technology, the thermal imager 802 converts the temperature distribution within the combustion chamber into a visual image, presenting the temperature differences and trends in the waste combustion area. Through a signal connection with the control system 9, the thermal imager 802 transmits these image data to the control system 9 in real time. The image data from the thermal imager 802 allows the control system 9 to intuitively see the combustion area and temperature distribution of the waste within the combustion chamber. For areas with incomplete combustion or abnormal temperatures, the control system 9 can specifically adjust the movement speed and tilt angle of the grate 3, changing the residence time and distribution of the waste on the grate, while simultaneously adjusting the airflow in the corresponding air chamber of the primary air supply duct 5, enabling more complete combustion of the waste.

[0050] Temperature sensor 803 is located below grate 3 to monitor the temperature below the grate. Since temperature changes below the grate reflect the degree of combustion of waste on the grate and the distribution and utilization of primary air, temperature sensor 803 continuously measures the temperature below the grate and feeds the temperature signal back to control system 9 in real time, enabling the control system to promptly grasp the thermal state below the grate. If the temperature below the grate is excessively high in a localized area, it may indicate insufficient primary air distribution or overly vigorous waste combustion in that area. In such cases, control system 9 will adjust the primary air distribution to optimize the combustion process and improve combustion efficiency.

[0051] In an embodiment of this utility model, the grate 3 includes a drying section 301, a combustion section 302, and a burnout cooling section 303 that are inclined downwards at 15° to 20° in sequence;

[0052] The bottom of the drying section 301 is provided with a wind chamber connected to a primary air supply duct 5, the bottom of the combustion section 302 is provided with three wind chambers connected to three primary air supply ducts 5, and the bottom of the burnout cooling section 303 is provided with two wind chambers connected to two primary air supply ducts 5.

[0053] Each primary air supply duct 5 is equipped with a control valve 501, and multiple primary air supply ducts 5 are connected to a ventilation pipe 502.

[0054] Specifically, the burnout cooling section 303 is composed of three parts with different functions, and each section is inclined downwards in sequence with an inclination angle between 15° and 20°. On the one hand, with the help of gravity, the waste can move naturally from the drying section to the burnout cooling section on the grate 3, realizing the orderly conveying of waste on the grate and reducing additional power consumption. On the other hand, the inclined grate 3 is conducive to the waste making full contact with the primary air supplied below, promoting the combustion process.

[0055] The drying section 301 has only one air chamber at its bottom, which is connected to a primary air supply duct 5. During the waste drying stage, an appropriate amount of air is supplied through this primary air supply duct 5 to provide the necessary heat and oxygen for the waste drying process. The combustion section 302 has three air chambers at its bottom, each connected to one of the three primary air supply ducts 5. Since the combustion section is the main area for waste combustion, the combustion conditions vary in different locations. The three independent air chambers and corresponding primary air supply ducts 5 can precisely adjust the air supply to each area according to the actual combustion state of the waste in the combustion section, ensuring complete combustion. The burnout cooling section 303 has two air chambers at its bottom, each connected to one of the two primary air supply ducts 5. In this stage, air is supplied to further burn off the remaining combustible components in the waste, and the slag after combustion is cooled for subsequent processing. The ventilation pipes 502 serve to collect and distribute air, and each primary air supply duct 5 is equipped with a control valve 501 for control.

[0056] The segmentation of the grate 3 and the inclination angle of each segment, combined with the varying number of air chambers and primary air supply ducts 5, ensure that the waste receives an appropriate amount of air at different stages of combustion. In the drying section 301, an appropriate amount of primary air removes moisture from the waste without causing excessive heat loss due to excessive air volume. The three air chambers in the combustion section 302 are independently supplied with air, which can be precisely adjusted according to the combustion situation to ensure that the waste is fully combusted in this area. The two primary air supply ducts 5 in the burnout cooling section 303 ensure that the remaining combustible components are completely burned while cooling the slag.

[0057] In an embodiment of this utility model, the air chamber at the bottom end of the burnout cooling section 303 is connected to a combustion-supporting pipe 304, and oxygen with a concentration of 28% to 30% is injected into the combustion-supporting pipe 304.

[0058] The surface of the grate 3 includes fixed grate plates and movable grate plates that are stacked at intervals in a stepped shape; both the fixed grate plates and the movable grate plates are coated with a ceramic coating.

[0059] The moving speed of the drying section 301, the combustion section 302 and the burnout cooling section 303 is 0.5m / h to 2.5m / h.

[0060] Specifically, a combustion-supporting pipe 304 is connected to the air chamber at the bottom end of the burnout cooling section 303. The combustion-supporting pipe 304 supplies a high concentration of oxygen to the burnout cooling section, with an oxygen concentration of 28%–30% injected into its interior. This provides sufficient oxygen for the final stage of waste combustion, ensuring that residual combustible materials in the waste are fully burned, reducing unburned carbon emissions, and improving combustion efficiency. By supplying a high concentration of oxygen, further heat-reducing treatment of the slag is facilitated, lowering the carbon content of the slag.

[0061] The surface of grate 3 is composed of fixed grate bars and movable grate bars stacked alternately in a stepped arrangement. This facilitates the uniform distribution and gradual combustion of waste on the grate. As the waste moves along the stepped structure of the grate, it can fully contact the air, increasing the combustion area and promoting the combustion process. Both the fixed and movable grate bars are coated with a ceramic coating, which possesses properties such as high temperature resistance, wear resistance, and corrosion resistance. The high temperature resistance allows the grate bars to maintain stable physical and chemical properties under the high-temperature environment of waste combustion, making them less prone to deformation or damage; the wear resistance reduces wear on the grate bars during waste movement and mechanical motion, extending the service life of grate 3; and the corrosion resistance effectively resists the erosion of the grate bars by corrosive gases produced during waste combustion. The moving speed of the drying section 301, combustion section 302, and burnout cooling section 303 is 0.5 m / h to 2.5 m / h, allowing grate 3 to be flexibly adjusted according to the properties of the waste (such as calorific value, humidity, composition, etc.) and the combustion state.

[0062] In an embodiment of this utility model, the outlet of the secondary air supply pipe 6 is provided with a swirling nozzle 601, and the nozzle velocity of the swirling nozzle 601 is 20m / s to 35m / s.

[0063] Specifically, the secondary air supply duct 6 has a swirl nozzle 601 installed at the air outlet, which enables the air supplied from the secondary air supply duct 6 to generate a swirling flow effect when it is ejected.

[0064] The position of the swirl nozzle 601 in the combustion chamber 4 can achieve the best air injection effect, ensuring that the injected air can be fully mixed with the flue gas and waste combustion products in the combustion chamber.

[0065] The nozzle velocity is controlled within the range of 20m / s to 35m / s, enabling efficient mixing of air and flue gas while avoiding the adverse effects of excessively high or low velocities. Too low a velocity results in insufficient mixing of air and flue gas, failing to effectively promote combustion; too high a velocity may excessively disturb the airflow field within the combustion chamber, even extinguishing the flame and affecting combustion stability. The rotating secondary airflow creates a complex airflow field within combustion chamber 4, altering the flue gas's flow path and extending its residence time. This provides more reaction time for the combustible components in the waste combustion products, further promoting complete combustion and reducing the emission of unburned materials.

[0066] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A clean combustion device of a waste incineration power plant, characterized in that it comprises a waste feeding hopper (1), a dosing feeder (2), a grate (3), a combustion chamber (4), a primary air duct (5), a secondary air duct (6), a flue chamber (7), a monitoring assembly (8) and a control system (9); the dosing feeder (2) is arranged below the waste feeding hopper (1), and the output end of the dosing feeder (2) is arranged in a stepped manner with the grate (3); the wind chamber below the grate (3) is provided with a plurality of primary air ducts (5), the top of the grate (3) forms the combustion chamber (4), the combustion chamber (4) is communicated with the flue chamber (7), and the combustion chamber (4) is connected with the secondary air duct (6) on both sides of the throat; the outlet of the flue chamber (7), the rear arch wall of the combustion chamber (4) and the area below the grate (3) are provided with the monitoring assembly (8), and the monitoring assembly (8) is signal connected with the control system (9).

2. The clean combustion device of a waste incineration power plant according to claim 1, characterized in that the monitoring assembly (8) comprises an oxygen concentration sensor (801) arranged at the outlet of the flue chamber (7), a thermal imager (802) arranged on the rear arch wall of the combustion chamber (4) and a temperature sensor (803) arranged below the grate (3), and the oxygen concentration sensor (801), the thermal imager (802) and the temperature sensor (803) are signal connected with the control system (9).

3. The clean combustion device of a waste incineration power plant according to claim 2, characterized in that the angle α between the thermal imager (802) and the vertical line of the ground is 15°-20°.

4. The clean combustion device of a waste incineration power plant according to claim 1, characterized in that the grate (3) comprises a drying section (301), a combustion section (302) and a burnout cooling section (303) which are sequentially inclined downward by 15°-20°; 5. The clean combustion device of a waste incineration power plant according to claim 4, characterized in that a control valve (501) is arranged on each primary air duct (5), and a plurality of primary air ducts (5) are jointly communicated with a ventilation pipe (502).

6. The clean combustion device of a waste incineration power plant according to claim 4, characterized in that the wind chamber at the end of the bottom of the burnout cooling section (303) is communicated with a combustion-supporting pipeline (304), and 28%-30% concentration of oxygen is injected into the combustion-supporting pipeline (304).

7. The clean combustion device of a waste incineration power plant according to claim 4, characterized in that the surface of the grate (3) comprises fixed grate pieces and movable grate pieces which are spaced and stacked in a stepped manner. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The surface of the fixed grate piece and the movable grate piece is coated with a ceramic coating.

8. The clean combustion device of a waste incineration power plant according to claim 4, characterized in that, The moving speed of the drying section (301), the combustion section (302) and the burnout cooling section (303) is 0.5-2.5 m / h.

9. The clean combustion device of a waste incineration power plant according to claim 1, characterized in that, The air outlet of the secondary air supply pipe (6) is provided with a swirl nozzle (601), and the nozzle air speed of the swirl nozzle (601) is 20-35 m / s.

Images