Urea dry particle direct injection denitration system

Abstract

The utility model discloses a urea dry particle direct injection denitration system which comprises a fluidized bed incinerator, a urea particle storage bin, a feeding system, a metering feeder, an injection device, a high-temperature flue and a waste heat boiler. The fluidized bed incinerator is connected with the waste heat boiler through a high-temperature flue; the feeding system is located on the upper portion of the urea particle storage bin, the metering feeder is located at the bottom of the urea particle storage bin, and an outlet of the metering feeder is connected with the spraying device. The urea denitration can better adapt to the requirements of different types of combustion equipment and emission standards; and the urea is directly and uniformly sprayed into the high-temperature flue in a solid form in cooperation with the spraying device, so that the reaction speed is increased, the urea distribution is more uniform, the denitration efficiency is improved, the problem that a large amount of heat in the flue gas is taken away after the moisture of the urea solution is evaporated is avoided, and the heat energy recycling rate is improved.

Description

Technical Field

[0001] The utility model relates to an environmental protection technology, in particular to a urea dry particle direct injection denitrification system. Background Art

[0002] SNCR (Selective Non-Catalytic Reduction) technology is a widely used flue gas denitrification process. It primarily reduces NOx emissions by injecting a reducing agent (such as urea solution) into the combustion process, where it reacts with NOx at high temperatures to produce N2 and H2O. This technology has been widely adopted both domestically and internationally due to its short construction period, low investment, and simple operation. Despite its numerous advantages, SNCR technology generally uses urea solution and the high injection volume, which can easily cause spraying onto opposing equipment walls or dripping onto underlying equipment walls (such as boiler water-cooled walls). This can cause corrosion, rendering the entire system inoperable, and potentially leading to safety incidents. Utility Model Content

[0003] In order to solve the above-mentioned defects of the prior art, the utility model provides a urea dry granule direct injection denitrification system with higher flexibility and adaptability.

[0004] In order to achieve the above technical objectives, the present invention adopts the following technical solutions: a urea dry granule direct injection denitrification system, characterized in that it includes a fluidized bed incinerator, a urea granule storage bin, a feeding system, a metering feeder, an injection device, a high-temperature flue and a waste heat boiler; the fluidized bed incinerator is connected to the waste heat boiler through the high-temperature flue; the feeding system is located on the upper part of the urea granule storage bin, the metering feeder is located at the bottom of the urea granule storage bin, the metering feeder is used to control the amount of denitrification agent added, the outlet of the metering feeder is connected to the injection device, and the injection device is used to inject the denitrification agent into the high-temperature flue.

[0005] Preferably, an air blowing system is provided at the lower portion of the urea granule storage bin.

[0006] Preferably, the injection device includes a dosing fan, a dosing channel and a spray gun, the dosing channel connects the dosing fan and the spray gun, the outlet of the metering feeder is connected to the dosing channel, and the outlet of the spray gun is arranged on the high-temperature flue.

[0007] Preferably, the denitrification agent is urea dry granules.

[0008] Preferably, the feeding system includes a bag unpacker and a loading system, the loading system is used to load urea bags, and the bag unpacker is used to unpack the urea bags so that the dry urea granules fall into the urea granule storage bin.

[0009] In summary, the present invention has achieved the following technical effects:

[0010] The urea dry granule direct injection denitrification system of the present invention adopts a metering feeder and can be adjusted under different working conditions to achieve the best denitrification effect. It has high flexibility, so that urea denitrification can better adapt to the requirements of different types of combustion equipment and emission standards. In addition, in conjunction with the injection device, urea is directly and evenly sprayed into the high-temperature flue in solid form, which not only increases the reaction speed, makes the urea distribution more uniform, and improves the denitrification efficiency, but also avoids the problem of urea solution taking away a large amount of heat in the flue gas after water evaporation, thereby improving the heat energy recovery rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a schematic diagram of the urea dry granular direct injection denitrification system of the present invention;

[0012] Explanation of the reference numerals in the accompanying drawings in the specification: 1. Fluidized bed incinerator; 2. Waste heat boiler; 3. High-temperature flue; 4. Feeding system; 5. Bag unpacking machine; 6. Loading system; 7. Urea granule storage bin; 8. Air blowing system; 9. Measuring feeder; 10. Injection device; 11. Dosing fan; 12. Spray gun. DETAILED DESCRIPTION

[0013] The present invention will be described in further detail below with reference to the accompanying drawings.

[0014] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed. However, as long as they are within the scope of the claims of the present invention, they are protected by patent law.

[0015] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation to the present invention.

[0016] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of this utility model, "plurality" means two or more, unless otherwise specifically defined.

[0017] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, indirect connection through an intermediate medium, internal communication between two components, or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0018] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0019] Example 1:

[0020] like Figure 1 As shown, a urea dry granule direct injection denitrification system is characterized in that it includes a fluidized bed incinerator 1, a urea granule storage bin 7, a feeding system 4, a metering feeder 9, an injection device 10, a high-temperature flue 3 and a waste heat boiler 2; the fluidized bed incinerator 1 is connected to the waste heat boiler 2 through the high-temperature flue 3; the feeding system 4 is located on the upper part of the urea granule storage bin 7, the metering feeder 9 is located at the bottom of the urea granule storage bin 7, the metering feeder 9 is used to control the amount of denitrification agent added, and the outlet of the metering feeder 9 is connected to the injection device 10, and the injection device 10 is used to inject the denitrification agent into the high-temperature flue 3.

[0021] Metering feeder 9, also known as quantitative feeder, is a mechanical equipment for continuous weighing and quantitative conveying of solid bulk materials (lumps, particles, powders, etc.). It is widely used in cement, mining, building materials, grain, chemical and other industries. It is known for its advanced technology, stability, reliability, high cost performance and durability. It is a high-tech product that integrates conveying, weighing and quantitative control.

[0022] The urea dry granule direct injection denitrification system of the present invention adopts a metering feeder 9, which can be adjusted under different working conditions to achieve the best denitrification effect. It has high flexibility, so that urea denitrification can better adapt to the requirements of different types of combustion equipment and emission standards; and in conjunction with the injection device 10, urea is directly and evenly sprayed into the high-temperature flue 3 in solid form, which not only increases the reaction speed, makes the urea distribution more uniform, improves the denitrification efficiency, but also avoids the problem of urea solution taking away a large amount of heat in the flue gas after water evaporation, thereby improving the heat energy recovery rate.

[0023] An air blowing system 8 is provided at the lower part of the urea granule storage bin 7; the air blowing system 8 is used to ensure that the urea granule storage bin 7 can be discharged normally and prevent blockage; the air blowing system 8 is composed of a blower and a blow channel, the blow channel connects the blower and the bottom of the urea granule storage bin 7, and the blower blows air into the blow channel until it enters the urea granule storage bin 7.

[0024] The injection device 10 includes a dosing fan 11, a dosing channel and a spray gun 12. The dosing channel connects the dosing fan 11 and the spray gun 12. The outlet of the metering feeder 9 is connected to the dosing channel. The outlet of the spray gun 12 is set on the high-temperature flue 3.

[0025] The denitrification agent is urea dry granules.

[0026] The feeding system 4 includes a bag unpacker 5 and a loading system 6. The loading system 6 is used to load urea bags, and the bag unpacker 5 is used to unpack urea bags so that dry urea granules fall into the urea granule storage bin 7. The feeding system 6 is mainly a conveyor belt, and the bag unpacker 5 is a "vacuum suction" supporting equipment used to unpack bags of granular materials such as clay and coal powder to achieve dust-free operation.

[0027] Working principle: The bagged urea is fed into the feeding system 4. After the bagged urea is unpacked by the unpacking machine 5, the urea granules fall into the unloading system connected at the bottom. After the urea granules fall into the urea granule storage bin 7, they are prevented from agglomeration and clogging by the air blowing system 8. The bottom discharge port of the urea granule storage bin 7 is connected to the feed port of the metering feeder 9. The temporarily stored urea granules fall into the metering feeder 9 and are evenly fed out after being weighed. The outlet of the dosing fan 11 is connected to the discharge pipeline of the metering feeder 9 through the dosing flow channel. The dosing fan 11 draws air to feed the dry urea granules into the high-temperature flue 3 through the spray gun 12.

[0028] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are within the scope of the technical solution of the present invention.

Claims

1. A urea dry granule direct injection denitrification system, characterized in that: It includes fluidized bed incinerator, urea granule storage silo, feeding system, metering feeder, injection device, high-temperature flue and waste heat boiler; The fluidized bed incinerator is connected to the waste heat boiler through the high-temperature flue; the feeding system is located at the upper part of the urea granule storage bin, and the metering feeder is located at the bottom of the urea granule storage bin. The metering feeder is used to control the amount of denitrification agent added, and the outlet of the metering feeder is connected to the injection device, which is used to inject the denitrification agent into the high-temperature flue.

2. A urea dry granule direct injection denitrification system according to claim 1, characterized in that: An air blowing system is provided at the lower part of the urea granule storage bin.

3. The urea dry granule direct injection denitrification system according to claim 1, characterized in that: The injection device includes a dosing fan, a dosing channel and a spray gun. The dosing channel connects the dosing fan and the spray gun. The outlet of the metering feeder is connected to the dosing channel. The outlet of the spray gun is arranged on the high-temperature flue.

4. The urea dry granule direct injection denitrification system according to claim 1, characterized in that: The desulfurization agent is urea dry particles.

5. A urea dry granule direct injection denitrification system according to claim 4, characterized in that: The feeding system includes a bag unpacker and a loading system. The loading system is used to load urea bags. The bag unpacker is used to unpack the urea bags so that the dry urea granules fall into the urea granule storage bin.

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