Simultaneous desulfurization and denitrification equipment

Abstract

The utility model discloses simultaneous desulfurization and denitration equipment, which comprises a denitration agent bin, a desulfurization agent bin, a venturi ejector and a boiler, a denitration screw conveyor is arranged below the outlet end of the denitration agent bin, a denitration outlet pipeline is arranged at the discharge end of the denitration screw conveyor, and a denitration outlet pipeline is arranged at the discharge end of the denitration screw conveyor. A desulfurization spiral conveyor is arranged below the outlet end of the desulfurization agent bin, a desulfurization outlet pipeline is arranged at the discharging end of the desulfurization spiral conveyor, one end of the desulfurization outlet pipeline is connected with one end of a denitration outlet pipeline, and the other end of the desulfurization outlet pipeline is connected with a feeding port of a Venturi ejector; and a discharge hole of the venturi ejector is connected with the boiler. The denitration agent and the desulfurizing agent are conveyed in an up-and-down mode, the equipment is compact, bridging and blocking during raw material conveying are avoided, meanwhile, boiler holes are formed in a staggered mode, it is guaranteed that flue gas is evenly mixed to the maximum extent, the removal efficiency is improved, and operation is reliable and stable.

Description

Technical Field

[0001] The utility model belongs to the technical field of flue gas purification, and in particular relates to simultaneous desulfurization and denitrification equipment. Background Art

[0002] In the incineration projects in various regions, the requirements for boiler flue gas emission indicators are getting higher and higher, especially for NO x The emission control of NO and SO2 has attracted much attention because they will form photochemical smog and threaten human life and health. x The control adopts SCR process, and SO2 control adopts wet method, but it is costly and complicated, and is gradually replaced by dry method. Patent with application number 202220919369.2 discloses a dry desulfurization and denitrification integrated process system, which adopts silo pump transportation, does not optimize the entire desulfurization and denitrification dosage arrangement, and consumes a lot of energy. Therefore, it is necessary to develop a new equipment to avoid bridging or blockage of raw material transportation and reduce costs. Utility Model Content

[0003] Technical problems solved: In response to the above technical problems, the utility model provides a simultaneous desulfurization and denitrification equipment. The denitrification and desulfurization transportation are arranged in an upper and lower manner. The equipment is compact and avoids bridging and blockage of raw material transportation. At the same time, the boiler openings are arranged in a staggered manner to ensure uniform mixing of flue gas to the maximum extent, improve removal efficiency, and ensure reliable and stable operation.

[0004] Technical solution: A simultaneous desulfurization and denitrification equipment, comprising a denitrification agent silo, a desulfurization agent silo, a venturi injector and a boiler, a denitrification screw conveyor is provided below the outlet end of the denitrification agent silo, a denitrification outlet pipe is provided at the discharge end of the denitrification screw conveyor, a desulfurization screw conveyor is provided below the outlet end of the desulfurization agent silo, a desulfurization outlet pipe is provided at the discharge end of the desulfurization screw conveyor, one end of the desulfurization outlet pipe is connected to one end of the denitrification outlet pipe, the other end of the desulfurization outlet pipe is connected to the feed port of the venturi injector, and the discharge port of the venturi injector is connected to the boiler.

[0005] Preferably, a denitrification stirring device is provided at the bottom of the denitrification agent silo.

[0006] Preferably, a desulfurization stirring device is provided inside the desulfurizer silo.

[0007] Preferably, the denitration outlet pipe and the desulfurization outlet pipe are both arranged vertically, and the denitration outlet pipe is arranged above the desulfurization outlet pipe.

[0008] Preferably, the device further comprises a metering module, and the metering module controls the conveying frequencies of the denitrification screw conveyor and the desulfurization screw conveyor respectively.

[0009] Preferably, the temperature window of the boiler comprises three layers, each layer is provided with a plurality of openings, and corresponding spray guns are provided in the openings. The opening positions of the temperature windows of the first layer of the boiler are the same as the opening positions of the temperature windows of the third layer, and the opening positions of the temperature windows of the second layer are staggered with the opening positions of the temperature windows of the first layer.

[0010] Furthermore, the left and right side walls of the second flue of the boiler are provided with reserved openings.

[0011] Beneficial effect: The utility model is a simultaneous desulfurization and denitrification equipment, which can x The delivery amount of denitrification agent and desulfurization agent is controlled by the indicators of SO2. The denitrification agent silo and the desulfurization agent silo are arranged up and down, and the equipment is compact to avoid bridging or blockage of raw material transportation. At the same time, the opening position of the boiler temperature window is arranged by the insertion method to ensure the uniform mixing of flue gas to the maximum extent, high removal efficiency, reliable and stable operation, and at the same time save the use cost of desulfurization agent and denitrification agent. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a structural schematic diagram of a simultaneous desulfurization and denitrification device of the utility model;

[0013] Figure 2 It is a schematic diagram of the opening position of the temperature window of the boiler in the utility model;

[0014] Serial numbers in the figure: 1. Denitrification agent silo, 2. Desulfurization agent silo, 3. Desulfurization stirring device, 4. Desulfurization motor, 5. Denitrification stirring device, 6. Denitrification screw conveyor, 7. Desulfurization screw conveyor, 8. Metering module, 9. Denitrification outlet pipeline, 10. Desulfurization outlet pipeline, 11. Venturi ejector. DETAILED DESCRIPTION

[0015] The technical solution of the utility model is further described in detail below in conjunction with the accompanying drawings. Example 1

[0016] Reference Figure 1A simultaneous desulfurization and denitration device comprises a desulfurization agent silo 1, a desulfurization agent silo 2, a venturi ejector 11, a boiler and a metering module 8. A denitration stirring device 5 is provided at the bottom of the denitration agent silo 1 to prevent raw materials from bridging or sticking to the wall and ensure that the raw materials are in a normal flow state. A denitration screw conveyor 6 is provided below the outlet end of the denitration agent silo 1. The denitration screw conveyor 6 is driven by a denitration motor. A denitration outlet pipe 9 is provided at the discharge end of the denitration screw conveyor 6. A desulfurization stirring device 3 is provided inside the desulfurization agent silo 2. Vertical stirring is adopted because the silo is large. A desulfurization screw conveyor 7 is provided below the outlet end of the desulfurization agent silo 2. The desulfurization screw conveyor 7 Driven by the desulfurization motor 4, the discharge end of the desulfurization screw conveyor 7 is provided with a desulfurization outlet pipe 10, one end of the desulfurization outlet pipe 10 is connected to one end of the denitrification outlet pipe 9, and the other end of the desulfurization outlet pipe 10 is connected to the feed port of the venturi injector 11. The denitrification outlet pipe 9 and the desulfurization outlet pipe 10 are both vertically arranged, and the denitrification outlet pipe 9 is arranged above the desulfurization outlet pipe 10, and the discharge port of the venturi injector 11 is connected to the boiler; the metering module 8 controls the conveying frequency of the denitrification screw conveyor 6 and the desulfurization screw conveyor 7 respectively, and adjusts the feeding frequency in real time according to the change of the raw material weight in the silo to ensure the accuracy of the conveying, and the error is within ±2 %; the denitrification agent and the desulfurization agent are transported to the inlets of the denitrification outlet pipe 9 and the desulfurization outlet pipe 10 according to the set ratio, and the material outlet of the denitrification outlet pipe 9 falls into the desulfurization outlet pipe 10, ensuring that the material entering the desulfurization outlet pipe 10 will not bridge or hang on the wall, and at the same time promote the uniform mixing of the two substances. While stirring, the material is allowed to continuously fall to the vicinity of the nozzle of the venturi ejector 11 by gravity, ensuring that no certain raw material will accumulate in the venturi due to different raw material densities and particle sizes, and the transportation and mixing are uniform. After passing through the venturi ejector 11, the two raw materials are evenly mixed according to the ratio, and then sprayed into the boiler through a spray gun.

[0017] Boiler opening Figure 2 As shown, the temperature window of the boiler includes three layers, each layer is provided with a number of openings, and corresponding spray guns are arranged in the openings. The opening position of the first layer of the temperature window of the boiler is the same as the opening position of the third layer of the temperature window, and the front wall is opened at a distance of 1800~1900mm. The second layer of the temperature window adopts the intercalation method and is arranged between the first and third layers of openings, which maximizes the uniformity of mixing. The left and right side walls are opened at an interval of about 1800mm respectively. In order to prevent the boiler from overheating, the left and right side walls of the second flue are reserved, and spray guns are arranged in the reserved openings; the second layer of spray guns are always put into use during operation; when the boiler load is low (less than 80%), the first layer of spray guns are put into use; when the boiler load is high (90~100%), the third layer of spray guns are put into use; when overloaded (greater than 100%), the third layer of spray guns and the second flue spray guns are put into use.

[0018] The utility model sets the denitrification agent silo 1 at the upper part and the desulfurization agent silo 2 at the lower part. Through the upper and lower arrangements, the denitrification agent and the desulfurization agent can fall into the middle position of the venturi conveyor at the same time, avoiding the accumulation of raw materials and the wall hanging phenomenon in the venturi ejector 11, and ensuring continuous and stable operation. Example 2

[0019] The equipment of Example 1 was applied to a 750 t / d waste incinerator in Tianjin, and the initial SO2 concentration was 600 mg / Nm 3 , NO x 300 mg / Nm 3 , the emission index is SO2 less than 20 mg / Nm 3 , NO x Less than 120 mg / Nm 3 Before using the utility model equipment, the desulfurization agent consumption was 2 kg / t garbage, and the denitrification agent consumption was 1.5 kg / t garbage. After using the utility model equipment, NO x Average value 90 mg / Nm 3 The average SO2 content is 15 mg / Nm 3 The desulfurizer consumption is 1.2 kg / t of garbage, and the denitrifier consumption is 0.8 kg / t of garbage. The operation is continuous and stable, and the reliability is further enhanced. The desulfurizer consumption is reduced by 40%, and the denitrifier consumption is reduced by 46.7%, thereby saving costs.

[0020] The embodiments of this specific implementation method are all preferred embodiments of the utility model, and are not intended to limit the protection scope of the utility model. Therefore, all equivalent changes made based on the structure, shape, and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A simultaneous desulfurization and denitrification device, characterized in that: It includes a denitrification agent silo, a desulfurization agent silo, a venturi injector and a boiler. A denitrification screw conveyor is provided below the outlet end of the denitrification agent silo, and a denitrification outlet pipe is provided at the discharge end of the denitrification screw conveyor. A desulfurization screw conveyor is provided below the outlet end of the desulfurization agent silo, and a desulfurization outlet pipe is provided at the discharge end of the desulfurization screw conveyor. One end of the desulfurization outlet pipe is connected to one end of the denitrification outlet pipe, and the other end of the desulfurization outlet pipe is connected to the feed port of the venturi injector, and the discharge port of the venturi injector is connected to the boiler.

2. The simultaneous desulfurization and denitrification equipment according to claim 1, characterized in that: A denitrification stirring device is provided at the bottom of the denitrification agent silo.

3. The simultaneous desulfurization and denitrification equipment according to claim 1, characterized in that: A desulfurization stirring device is arranged inside the desulfurizer silo.

4. The simultaneous desulfurization and denitrification equipment according to claim 1, characterized in that: The denitration outlet pipeline and the desulfurization outlet pipeline are both arranged vertically, and the denitration outlet pipeline is arranged above the desulfurization outlet pipeline.

5. The simultaneous desulfurization and denitrification equipment according to claim 1, characterized in that: It also includes a metering module, which controls the conveying frequency of the denitrification screw conveyor and the desulfurization screw conveyor respectively.

6. The simultaneous desulfurization and denitrification equipment according to claim 1, characterized in that: The temperature window of the boiler includes three layers, each layer is provided with a plurality of openings, and corresponding spray guns are arranged in the openings. The opening positions of the temperature windows of the first layer of the boiler are the same as the opening positions of the temperature windows of the third layer, and the opening positions of the temperature windows of the second layer are staggered with the opening positions of the temperature windows of the first layer.

7. The simultaneous desulfurization and denitrification equipment according to claim 6, characterized in that: The left and right side walls of the second flue of the boiler are provided with reserved openings.

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