Fixed bed internal circulation system and fixed bed desulfurization system
By establishing internal circulation between the two reaction towers of the fixed bed internal circulation system and adsorbing dust, the problem of dust emission exceeding the standard in the fixed bed dry desulfurization technology is solved, and the flue gas compliance and cost-effectiveness are achieved.
Patent Information
- Application Number
- CN202421246709.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-03
- Publication Date
- 2025-01-17
- Estimated Expiration
- 2034-06-03
AI Technical Summary
In the fixed bed dry desulfurization technology, the dust generated when filling or replacing the desulfurizer causes the particulate matter index to exceed the standard, and the existing technology is difficult to effectively solve, especially when the equipment is working, suspended particulate matter is directly discharged to the atmosphere, and the single tower dust collector is costly. .
Design a fixed bed internal circulation system, by establishing an internal circulation between two reaction towers, the generated dust is transported to another reaction tower by using an internal circulation fan, and the dust is adsorbed in the pharmaceutical particles during the flue gas flow. , achieve dust removal effect and ensure that flue gas meets standards for emissions.
It effectively avoids dust emissions when filling or replacing desulfurizers, improves the flue gas purification effect, ensures that particulate matter indicators meet standards, and reduces the cost demand of dust collectors.
Smart Images
Figure CN222358253U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of industrial flue gas purification, in particular to a fixed bed internal circulation system and a fixed bed desulfurization system. Background Art
[0002] In the fixed bed dry desulfurization technology, the reagent (desulfurizer) used is granular. Affected by the shape and desulfurization efficiency, it will produce a certain degree of powdering during production and transportation. When loading the fixed bed desulfurization equipment, the desulfurizer is lifted to the loading port of the desulfurization tower by the hanging beam, and loaded into the desulfurization tower by gravity. The desulfurization tower is usually equipped with a distribution cone to disperse the desulfurizer. The desulfurizer collides with the distribution cone, causing the dust generated during production and transportation to separate from the desulfurizer. Since the desulfurization tower is under negative pressure when working, the dust is directly sucked out when the desulfurizer is filled or replaced without stopping the machine, and is directly discharged through the chimney, causing the particulate matter index to exceed the standard.
[0003] At present, the fixed bed dry desulfurization technology adopts the installation of valves at the outlet of the desulfurization tower. When filling or replacing the desulfurizer, the valve is closed to prevent the dust from being directly sucked out and discharged, or a bypass pipe is set at the outlet to filter through the bag filter and then return to the fan and discharge through the chimney. Although the former solves the problem of excessive particulate matter when filling or replacing the desulfurizer, when the valve is opened for work, the particulate matter suspended in the desulfurization tower will be directly discharged into the atmosphere through the chimney, which will eventually cause excessive particulate matter. When the desulfurizer is replaced after the valve is closed, the dust-containing air in the desulfurization tower is replaced with the air outside the tower, resulting in unorganized emissions. The latter also solves the problem of excessive particulate matter when filling or replacing the desulfurizer, but the bag filter is set according to the flue gas processing volume of the single tower, and the dust collector is large in size and high in cost. Utility Model Content
[0004] The purpose of the present application is to provide a fixed bed internal circulation system and a fixed bed desulfurization system, which solves the problem of excessive particulate matter caused by dust generated during the filling or replacement of desulfurization agents.
[0005] In order to achieve the above-mentioned purpose, the utility model provides the following technical solutions.
[0006] A fixed bed internal circulation system comprises a first reaction tower, a second reaction tower and an internal circulation fan, wherein a smoke exhaust port at the upper end of the first reaction tower is connected to a first air outlet of the internal circulation fan via a first valve, a smoke inlet at the lower end of the first reaction tower is connected to a second air outlet of the internal circulation fan via a first control valve and a section master control valve in sequence, a smoke exhaust port at the upper end of the second reaction tower is connected to the first air outlet via a second valve, and a smoke inlet at the lower end of the second reaction tower is connected to the second air outlet via a second control valve and the section master control valve in sequence.
[0007] As an optional solution, the second air outlet is connected to the lower end of the first reaction tower through a first operating valve.
[0008] As an optional solution, the position on the first reaction tower where the first operating valve is connected is lower than the position of the smoke inlet of the first reaction tower.
[0009] As an optional solution, the second air outlet is connected to the lower end of the second reaction tower through a second operating valve.
[0010] As an optional solution, the position on the second reaction tower where the second operating valve is connected is lower than the position of the smoke inlet of the second reaction tower.
[0011] As an optional scheme, the fixed bed internal circulation system also includes several third reaction towers, the smoke exhaust port at the upper end of any third reaction tower is connected to the first air outlet through a third valve, the smoke inlet at the lower end of any third reaction tower is connected to the second air outlet through a third control valve, and the lower end of any third reaction tower is connected to the second air outlet through a third operating valve.
[0012] As an optional solution, the position on the third reaction tower where the third operating valve is connected is lower than the position of the smoke inlet of the third reaction tower.
[0013] A fixed bed desulfurization system comprises a smoke inlet pipeline, a system fan and a fixed bed internal circulation system as described in any of the above items, wherein the smoke inlet pipeline is used to transport smoke from a gas source to the first reaction tower and the second reaction tower, and the system fan is respectively connected to the smoke exhaust port of the first reaction tower and the smoke exhaust port of the second reaction tower.
[0014] As an optional solution, the fixed bed desulfurization system further comprises a chimney, and the output port of the system fan is connected to the chimney.
[0015] The utility model has at least the following beneficial effects:
[0016] An internal circulation system is established between the two reaction towers. When one of the reaction towers is filled with reagents, the generated dust is transported to the other reaction tower. As the dust flows upward with the flue gas, it is adsorbed in the reagent particles, achieving a dust removal effect and ensuring that the exhausted flue gas is up to standard. In addition, the dust can react with the flue gas when it is mixed with it, thereby improving the purification effect. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] The technical features and advantages of the present invention may be more fully understood by referring to the following detailed description in conjunction with the accompanying drawings.
[0018] Figure 1 This is a schematic diagram of an embodiment of the utility model.
[0019] Figure 2 This is a schematic diagram of another embodiment of the utility model.
[0020] Reference numerals:
[0021] 1. Smoke inlet pipeline; 2. System fan; 3. Chimney; 4. First reaction tower; 5. Second reaction tower; 6. Internal circulation fan; 61. First air outlet; 62. Second air outlet; 7. First valve; 8. First control valve; 9. Section main control valve; 10. Second valve; 11. Second control valve; 12. Third valve; 13. Fourth valve; 14. Gas source. DETAILED DESCRIPTION
[0022] Unless otherwise defined, the technical terms or scientific terms used in this specification and claims shall have the common meanings understood by persons having ordinary skills in the technical field to which the present invention belongs.
[0023] refer to Figure 1 Understand. The embodiment of the utility model provides a fixed bed desulfurization system, including a smoke inlet pipeline 1, a system fan 2, a fixed bed internal circulation system and a chimney 3. The smoke inlet pipeline 1 is used to transport the smoke from the gas source 14 (such as a furnace) to the smoke inlet of the fixed bed internal circulation system. The smoke inlet pipeline 1 can adopt the existing route. The input port of the system fan 2 is connected to the smoke exhaust port of the fixed bed internal circulation system, and the output port is connected to the chimney 3. The smoke enters the fixed bed internal circulation system from the gas source 14 for desulfurization treatment, and the treated smoke is discharged from the chimney 3 under the action of the system fan 2.
[0024] The fixed bed internal circulation system includes a first reaction tower 4, a second reaction tower 5 and an internal circulation fan 6. The smoke exhaust port at the upper end of the first reaction tower 4 is connected to the system fan 2, and is connected to the first air port 61 of the internal circulation fan 6 through a first valve 7. The smoke inlet at the lower end of the first reaction tower is connected to the gas source 14, and is connected to the second air port 62 of the internal circulation fan 6 through a first control valve 8 and a section master control valve 9 in sequence. The smoke exhaust port at the upper end of the second reaction tower 5 is connected to the system fan 2, and is connected to the first air port 61 through a second valve 10. The smoke inlet at the lower end of the second reaction tower 5 is connected to the gas source 14, and is connected to the second air port 62 through a second control valve 11 and a section master control valve 9 in sequence.
[0025] When the desulfurizer is filled into the first reaction tower 4, the first valve 7, the internal circulation fan 6, the section main control valve 9, the second control valve 11 and the third valve 12 between the smoke outlet of the second reaction tower 5 and the system fan 2 are opened, and the second valve 10, the first control valve 8 and the fourth valve 13 between the smoke outlet of the first reaction tower 4 and the system fan 2 are disconnected. At this time, the dust generated by the feeding in the first reaction tower 4 is input into the lower part of the second reaction tower 5. Since the dust itself is a powdered desulfurizer, the dust reacts with the sulfide in the flue gas when it is mixed with the flue gas, further reducing the sulfur content in the flue gas. In addition, the dust flows from the bottom to the top of the second reaction tower 5 with the airflow, and needs to pass through the agent. The granular agent is equivalent to a filter, which can absorb most of the dust, so that the particulate matter in the flue gas finally discharged from the second reaction tower 5 meets the standard. When filling the second reaction tower 5 with desulfurizer, open the second valve 10, the internal circulation fan 6, the section main control valve 9, the first control valve 8, the fourth valve 13 between the smoke exhaust port of the first reaction tower 4 and the system fan 2, disconnect the first valve 7, the second control valve 11 and the third valve 12 between the second reaction tower 5 and the system fan 2, and input the dust generated by feeding into the second reaction tower 5 into the lower part of the first reaction tower 4.
[0026] like Figure 2 As shown, the second air inlet 62 is connected to the lower end of the first reaction tower 4 through the first operating valve, and the position of the first reaction tower 4 connected to the first operating valve is located on the cone section of the first reaction tower 4 and is lower than the position of the smoke inlet of the first reaction tower 4. After the desulfurizer is discharged, dust remains at the bottom of the first reaction tower 4. The first valve 7, the internal circulation fan 6 and the first operating valve are opened, and the second valve 10 and the section master control valve 9 are disconnected. At this time, the first valve 7, the internal circulation fan 6, the first operating valve and the first reaction tower 4 jointly form an internal circulation, and air enters from the top of the first reaction tower 4. Under the action of the internal circulation, it is blown in from the lower end of the first reaction tower 4 to discharge the dust from the first reaction tower 4.
[0027] The second air inlet 62 is connected to the lower end of the second reaction tower 5 through the second operating valve. The position of the second reaction tower 5 connected to the second operating valve is located on the cone section of the second reaction tower 5 and is lower than the position of the smoke inlet of the second reaction tower 5. After the desulfurizer is discharged, dust remains at the bottom of the second reaction tower 5. The second valve 10, the internal circulation fan 6 and the second operating valve are opened, and the first valve 7 and the section master control valve 9 are disconnected. At this time, the second valve 10, the internal circulation fan 6, the second operating valve and the second reaction tower 5 jointly form an internal circulation. Air enters from the top of the second reaction tower 5, and is blown into from the lower end of the second reaction tower 5 under the action of the internal circulation, so that the dust is discharged from the second reaction tower 5.
[0028] In some embodiments, the fixed bed internal circulation system further includes a plurality of third reaction towers, the smoke exhaust port at the upper end of any third reaction tower is connected to the first air port 61 through a third valve 12, the smoke inlet at the lower end of any third reaction tower is connected to the second air port 62 through a third control valve, the lower end of any third reaction tower is connected to the second air port 62 through a third operating valve, and the position of the third operating valve connected to the third reaction tower is lower than the position of the smoke inlet of the third reaction tower. In other words, the fixed bed internal circulation system includes more than three reaction towers, and any two reaction towers can form the internal circulation relationship between the first reaction tower 4 and the second reaction tower 5, so that when a reaction tower needs to discharge or fill the desulfurizer, it can form the above-mentioned internal circulation system with any other working reaction tower.
[0029] It should be noted that the above description is based on the example of the application of the fixed bed internal circulation system in the fixed bed desulfurization system. In other embodiments, the fixed bed internal circulation system can be applied to the denitrification system, in which each reaction tower is filled with a denitrification agent, and can also be applied to the desulfurization and denitrification system, in which each reaction tower is filled with a desulfurization and denitrification agent.
[0030] In addition, the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "plurality" means two or more.
[0031] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.
Claims
1. A fixed bed internal circulation system, characterized in that: It includes a first reaction tower, a second reaction tower and an internal circulation fan, wherein the smoke exhaust port at the upper end of the first reaction tower is connected to the first air outlet of the internal circulation fan via a first valve, the smoke inlet at the lower end of the first reaction tower is connected to the second air outlet of the internal circulation fan via a first control valve and a section master control valve in sequence, the smoke exhaust port at the upper end of the second reaction tower is connected to the first air outlet via a second valve, and the smoke inlet at the lower end of the second reaction tower is connected to the second air outlet via a second control valve and the section master control valve in sequence.
2. The fixed bed internal circulation system according to claim 1, characterized in that: The second air port is connected to the lower end of the first reaction tower through a first operating valve.
3. The fixed bed internal circulation system according to claim 2, characterized in that: The position on the first reaction tower where the first operating valve is connected is lower than the position of the smoke inlet of the first reaction tower.
4. The fixed bed internal circulation system according to claim 1, characterized in that: The second air port is connected to the lower end of the second reaction tower through a second operating valve.
5. The fixed bed internal circulation system according to claim 4, characterized in that: The position on the second reaction tower where the second operating valve is connected is lower than the position of the smoke inlet of the second reaction tower.
6. The fixed bed internal circulation system according to claim 1, characterized in that: The fixed bed internal circulation system also includes several third reaction towers, the smoke exhaust port at the upper end of any third reaction tower is connected to the first air outlet through a third valve, the smoke inlet at the lower end of any third reaction tower is connected to the second air outlet through a third control valve, and the lower end of any third reaction tower is connected to the second air outlet through a third operating valve.
7. The fixed bed internal circulation system according to claim 6, characterized in that: The position of the third reaction tower connected with the third operating valve is lower than the position of the smoke inlet of the third reaction tower.
8. A fixed bed desulfurization system, characterized in that: It comprises a smoke inlet pipeline, a system fan and a fixed bed internal circulation system as described in any one of claims 1 to 7, wherein the smoke inlet pipeline is used to transport smoke from a gas source to the first reaction tower and the second reaction tower, and the system fan is respectively connected to the smoke exhaust port of the first reaction tower and the smoke exhaust port of the second reaction tower.
9. The fixed bed desulfurization system according to claim 8, characterized in that: The fixed bed desulfurization system further comprises a chimney, and the output port of the system fan is connected to the chimney.