A back-end flue gas treatment system for improving the mixing effect of medicaments with flue gas

Abstract

This utility model discloses a downstream flue gas treatment system for improving the mixing effect of reagents and flue gas, including a quench tower and a bag filter chamber. A dry reactor is disposed between the quench tower and the bag filter chamber. The input end of the quench tower is connected to the flue gas pipeline of the incineration unit, and the output end of the quench tower is connected to the input end of the dry reactor. The input end of the dry reactor is further provided with a first pipeline for inputting hydrated lime and a second pipeline for inputting activated carbon. The output end of the dry reactor is connected to the bag filter chamber. This downstream flue gas treatment system for improving the mixing effect of reagents and flue gas, by adding a dry reactor between the quench tower and the bag filter chamber, can greatly improve the mixing effect of activated carbon and hydrated lime with flue gas and extend the contact time between activated carbon and hydrated lime and flue gas.

Description

Technical Field

[0001] This utility model relates to a back-end flue gas treatment system, and more particularly to a back-end flue gas treatment system that improves the mixing effect of reagents and flue gas. Background Technology

[0002] In the process of treating hazardous waste, the downstream flue gas treatment process is a crucial guarantee for the environmental compliance of the incineration process. Waste contains trace amounts of heavy metals and acidic elements. After incineration, various elements in the flue gas need to be removed through chemical reactions or physical adsorption. Activated carbon is used to adsorb heavy metals and dioxins, while slaked lime is used to remove some acidic gases from the flue gas, ultimately ensuring that the flue gas and wastewater meet emission standards.

[0003] In hazardous waste incineration, the flue gas generated is typically cooled by a quench tower before directly entering the bag filter chamber through a flue. Before entering the bag filter chamber, slaked lime and activated carbon are introduced into the pipeline between the quench tower and the bag filter chamber via a blower. However, in actual operation, the heavy metal content in the wastewater occasionally becomes too high, preventing the wastewater from being discharged. Theoretical analysis has revealed that even with normal addition of activated carbon and slaked lime, insufficient contact time between some reagents and the flue gas leads to incomplete reactions, posing a risk of heavy metal contamination in the wastewater. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a back-end flue gas treatment system that improves the mixing effect of the agent and the flue gas, which can greatly improve the mixing effect of activated carbon and quicklime with the flue gas and extend the contact time between activated carbon and quicklime and the flue gas.

[0005] To address the aforementioned technical problems, this utility model provides a back-end flue gas treatment system for improving the mixing effect of reagents and flue gas, comprising a quench tower and a bag filter chamber. A dry reactor is disposed between the quench tower and the bag filter chamber. The input end of the quench tower is connected to the flue gas pipeline of the incineration device, and the output end of the quench tower is connected to the input end of the dry reactor. The input end of the dry reactor is further provided with a first pipeline for inputting quicklime and a second pipeline for inputting activated carbon. The output end of the dry reactor is connected to the bag filter chamber.

[0006] Furthermore, a Roots blower for conveying slaked lime is installed on the first pipeline, with a design flow rate of 700 Nm³. 3 / h, the total pipeline pressure is 54kPa.

[0007] Furthermore, an activated carbon conveying Roots blower with a design flow rate of 150 Nm³ is installed on the second pipeline. 3 / h, the total pipeline pressure is 54kPa.

[0008] Furthermore, the inlet temperature of the quench tower is 500°C, and the outlet temperature is 195°C.

[0009] Furthermore, a waste collection box 7 is provided at the bottom of the quench tower.

[0010] Furthermore, the main body material of the quench tower is carbon structural steel with a yield point of 235 MPa, and the inner surface of the carbon structural steel is covered with a layer of castable refractory.

[0011] Furthermore, the dry reactor includes an inner sleeve and an outer sleeve, which are coaxially arranged and connected at the top, and the lower part of the outer sleeve bends outward to form an output end connected to the bag filter chamber.

[0012] Furthermore, the input end of the dry reactor is located at the bottom of the inner sleeve and forms a mixing chamber, wherein the outer diameter of the inner sleeve at the mixing chamber is smaller than the outer diameter at the top of the inner sleeve.

[0013] Furthermore, the inner sleeve has a diameter of 1700 mm, and the outer sleeve has a diameter of 2800 mm.

[0014] Furthermore, a pressure sensor, a temperature sensor, and a weighing sensor are installed on the first pipeline, a weighing sensor is installed on the second pipeline, and a temperature sensor and a pressure sensor are installed on the pipeline from the quench tower to the dry reactor.

[0015] This invention offers the following advantages over existing technologies: The downstream flue gas treatment system provided by this invention, which enhances the mixing effect between the reagent and flue gas, maintains the original arrangement of the quench tower and bag filter chamber. By adding a dry reactor between the quench tower and bag filter chamber, the residence time of the flue gas in the flue (more than 2 seconds) is extended. Simultaneously, this promotes uniform mixing of the flue gas, activated carbon, and slaked lime in the dry reactor, ensuring sufficient contact with the flue gas and thus improving reaction efficiency. The selection of the dry reactor can be determined based on actual process calculations to confirm the equipment size and the residence time of the flue gas within the equipment. Computational fluid dynamics (CFD) simulations of the temperature and velocity fields are used to examine the flow field distribution of activated carbon and slaked lime within the equipment, confirming their mixing effect with the flue gas. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the back-end flue gas treatment system for improving the mixing effect of the agent and flue gas according to the present invention. Figure 2 This is a schematic diagram showing the connection between the quench tower and the dry reactor in the back-end flue gas treatment system of this utility model.

[0017] The diagram is marked as follows: 1. Quenching tower; 2. Dry reactor; 3. Bag filter room; 4. Roots blower for conveying hydrated lime; 5. Roots blower for conveying activated carbon; 6. Sensor; 7. Waste collection box. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0019] Figure 1 This is a schematic diagram of the back-end flue gas treatment system for improving the mixing effect of the agent and flue gas according to the present invention. Figure 2 This is a schematic diagram showing the connection between the quench tower and the dry reactor in the back-end flue gas treatment system of this utility model.

[0020] Please see Figure 1 and Figure 2 The present invention provides a back-end flue gas treatment system for improving the mixing effect of reagents and flue gas, comprising a quench tower 1 and a bag filter chamber 3, wherein a dry reactor 2 is disposed between the quench tower 1 and the bag filter chamber 3, the input end of the quench tower 1 is connected to the flue gas pipeline of the incineration device, the output end of the quench tower 1 is connected to the input end of the dry reactor 2, the input end of the dry reactor 2 is further provided with a first pipeline for inputting quicklime and a second pipeline for inputting activated carbon, and the output end of the dry reactor 2 is connected to the bag filter chamber 3.

[0021] The downstream flue gas treatment system provided by this utility model has the following processing procedure: After being cooled by the quench tower 1, the flue gas enters the dry reactor 2. Quicklime and activated carbon are introduced into the dry reactor 2 via a Roots blower and pipelines to mix and react with the flue gas. The purified flue gas then enters the bag filter chamber 3. Sensors 6 are installed on each pipeline to monitor temperature, pressure, or flow rate. Preferably, a pressure sensor, a temperature sensor, and a weighing sensor are installed on the first pipeline, a weighing sensor is installed on the second pipeline, and a temperature sensor and a pressure sensor are installed on the pipeline from the quench tower 1 to the dry reactor 2.

[0022] Quenching Tower 1: Inlet temperature: 500℃, outlet temperature: 195℃; Equipment dimensions: 5,600×26,300mm (total height: 26,300mm, net height: 17,945mm); Material: Q235B + castable refractory, where Q235 indicates carbon structural steel with a yield point (σs) of 235 MPa; the inner surface of the carbon structural steel is covered with a layer of castable refractory.

[0023] Activated carbon conveying Roots blower 5: Equipment model: SR80; Design flow rate: 150 Nm³ 3 / h; Total pressure: 54kPa; Motor power: 5.5kW; Material: Carbon steel.

[0024] Roots blower for slaked lime conveying: Model: SR125L; Design flow rate: 700 Nm³ 3 / h; Total pressure: 54kPa; Motor power: 5.5kW; Material: Carbon steel.

[0025] Dry reactor 2: Flue gas flow rate: 69602 Nm 3 / h; Temperature: 195℃; Equipment dimensions: Φ1700×L12300+Φ2800×L12000; Material: Carbon steel. Preferably, the dry reactor 2 includes an inner sleeve and an outer sleeve, which are coaxially arranged and connected at the top. The lower part of the outer sleeve bends outward to form an output end connected to the bag filter chamber 3. The input end of the dry reactor 2 is located at the bottom of the inner sleeve and forms a mixing chamber. The outer diameter of the inner sleeve at the mixing chamber is smaller than the outer diameter at the top of the inner sleeve to ensure thorough mixing of flue gas, activated carbon, and slaked lime.

[0026] The downstream flue gas treatment system provided by this utility model improves the mixing effect of activated carbon and slaked lime with flue gas and prolongs the contact time between activated carbon and slaked lime and flue gas by adding a dry reactor 2 between the quench tower 1 and the bag filter chamber 3. Specific advantages are as follows: 1. Without changing the original layout of the quench tower and bag filter room, a sleeve-type structure is used to make full use of the site space; 2. Increase the contact time between slaked lime and activated carbon in the flue gas; 3. Ensure that slaked lime and activated carbon are thoroughly mixed with the flue gas to increase the reaction contact area.

[0027] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications and improvements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the claims.

Claims

1. A downstream flue gas treatment system for improving the mixing effect of reagents and flue gas, comprising a quench tower and a bag filter chamber, characterized in that, The system includes a dry reactor located between a quench tower and a bag filter chamber. The input end of the quench tower is connected to the flue gas duct of the incineration unit, and the output end of the quench tower is connected to the input end of the dry reactor. The input end of the dry reactor is also provided with a first pipe for inputting quicklime and a second pipe for inputting activated carbon. The output end of the dry reactor is connected to the bag filter chamber.

2. The back-end flue gas treatment system for improving the mixing effect of reagents and flue gas as described in claim 1, characterized in that, The first pipeline is equipped with a Roots blower for conveying slaked lime, with a design flow rate of 700 Nm³. 3 / h, the total pipeline pressure is 54kPa.

3. The downstream flue gas treatment system for improving the mixing effect of reagents and flue gas as described in claim 1, characterized in that, The second pipeline is equipped with an activated carbon conveying Roots blower with a design flow rate of 150 Nm³. 3 / h, the total pipeline pressure is 54kPa.

4. The downstream flue gas treatment system for improving the mixing effect of reagents and flue gas as described in claim 1, characterized in that, The quench tower has an inlet temperature of 500°C and an outlet temperature of 195°C.

5. The downstream flue gas treatment system for improving the mixing effect of reagents and flue gas as described in claim 1, characterized in that, A waste collection box is installed at the bottom of the quench tower.

6. The downstream flue gas treatment system for improving the mixing effect of reagents and flue gas as described in claim 1, characterized in that, The main body of the quench tower is made of carbon structural steel with a yield point of 235 MPa, and the inner surface of the carbon structural steel is covered with a layer of castable refractory.

7. The downstream flue gas treatment system for improving the mixing effect of reagents and flue gas as described in claim 1, characterized in that, The dry reactor includes an inner sleeve and an outer sleeve, which are coaxially arranged and connected at the top. The lower part of the outer sleeve bends outward to form an output end that connects to the bag filter chamber.

8. The downstream flue gas treatment system for improving the mixing effect of reagent and flue gas as described in claim 7, characterized in that, The input end of the dry reactor is located at the bottom of the inner sleeve and forms a mixing chamber. The outer diameter of the inner sleeve at the mixing chamber is smaller than the outer diameter at the top of the inner sleeve.

9. The downstream flue gas treatment system for improving the mixing effect of reagents and flue gas as described in claim 7, characterized in that, The inner sleeve has a diameter of 1700mm, and the outer sleeve has a diameter of 2800mm.

10. The downstream flue gas treatment system for improving the mixing effect of reagents and flue gas as described in claim 1, characterized in that, A pressure sensor, a temperature sensor, and a weighing sensor are installed on the first pipeline, a weighing sensor is installed on the second pipeline, and a temperature sensor and a pressure sensor are installed on the pipeline from the quench tower to the dry reactor.

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