Reaction flue dredging device of desulfurization system

Abstract

The utility model discloses a desulfurization system reaction flue dredging device, which belongs to the technical field of flue gas desulfurization, and comprises a turbulent flow main path connected with an external gas source, a gas source main valve is arranged on the turbulent flow main path, a plurality of turbulent flow branches are distributed on the turbulent flow main path according to each easy-to-block position on a flue gas reaction flue, and the turbulent flow branches are communicated with the gas source main valve. The gas outlet end of each turbulent flow branch is communicated with the flue gas reaction flue at the corresponding easy-to-block position; a pressure transmitter is arranged at the air outlet end of each turbulent flow branch, a pulse valve is arranged at the air inlet end of each turbulent flow branch, and the pressure transmitters and the pulse valves are electrically connected with a controller. The utility model can reduce the blockage of the desulfurization system, find and process the blockage position in time, ensure the safe and stable operation of the desulfurization system, and ensure the desulfurization effect; and the threat to the indoor environment, the operation safety of electrical equipment and the health of personnel due to the fact that baking soda powder is recharged into a room due to blockage is avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of flue gas desulfurization, and in particular relates to a flue dredging device for a reaction flue of a desulfurization system. Background Art

[0002] Generally, the flue gas desulfurization system of boilers adopts "SDS baking soda dry desulfurization" such as Figure 1 As shown, due to the moisture absorption characteristics of baking soda, it is easy to harden. The baking soda delivery pipeline is long, which is more likely to cause powder accumulation and blockage at the bifurcation or bend of the pipeline. In addition, due to pressure delivery, the baking soda heats up during the friction between the baking soda and the pipeline, resulting in decomposition reaction and water production, which further promotes the adhesion of baking soda to the pipeline wall and finally causes blockage. During operation, if the pipeline is not cleared in time and causes blockage, it will seriously affect the flue gas desulfurization effect, exceed the emission standard, and pollute the atmospheric environment.

[0003] To solve the above blockage problem, it is generally necessary to dismantle and dredge, but the blockage location cannot be accurately determined. The pipeline needs to be dismantled and inspected section by section, which is particularly time-consuming and labor-intensive. In particular, the blockage frequency is high in the humid summer, which seriously affects the production and operation of power generation and desulfurization. If the blockage is serious and not discovered in time, it may cause the pipeline pressure to exceed the pipeline's bearing limit, resulting in pipeline pressure stagnation and baking soda powder backflow into the room, posing a threat to the indoor environment, the safety of electrical equipment operation and the health of personnel; in severe cases, it may even cause pipeline damage, causing serious economic losses to the production system.

[0004] In addition, if manual vibration or vibration motor is used for a short time, the effect is poor, and long-term vibration may cause the pipeline to rupture. There are also documents that add ultrasonic equipment or pulse vibration equipment to the pipeline, which has high investment costs, needs to be operated for a long time during the production process, has a poor operating environment, is difficult to maintain, is easy to damage, has high operating and maintenance costs, and cannot determine the location of the blockage. If a blockage problem occurs, the pipeline still needs to be disassembled for processing. Summary of the invention

[0005] In view of the problems existing in the prior art, the utility model provides a desulfurization system reaction flue dredging device, which can reduce the blockage of the desulfurization system, promptly discover the blockage location and deal with it, ensure the safe and stable operation of the desulfurization system, and ensure the desulfurization effect; it avoids baking soda powder from being backflowed into the room due to blockage, posing a threat to the indoor environment, the safe operation of electrical equipment and the health of personnel.

[0006] The utility model is implemented as follows: a desulfurization system reaction flue dredging device comprises a disturbance flow main circuit connected to an external gas source, a gas source main valve is arranged on the disturbance flow main circuit, the disturbance flow main circuit is divided into a plurality of disturbance flow branches according to each easily blocked position on the flue gas reaction flue, and the gas outlet end of each disturbance flow branch is connected to the flue gas reaction flue at the corresponding easily blocked position;

[0007] A pressure transmitter is provided at the air outlet end of each of the spoiler branches, and a pulse valve is provided at the air inlet end of each of the spoiler branches. The pressure transmitter and the pulse valve are electrically connected to the controller. The pressure transmitter transmits the outlet pressure data of the corresponding spoiler branch outlet end to the controller, and adjusts the opening and closing degree of the pulse valve according to the outlet pressure data of the spoiler branch outlet end.

[0008] Furthermore, the airflow direction in the spoiler branch is set in the opposite direction to the airflow direction in the flue gas reaction flue, and the angle between the gas purge direction at the outlet end of the spoiler branch and the airflow direction in the flue gas reaction flue is 30° to 60°. Convection will be formed between the reversely flowing airflows, effectively reducing the deposition of particulate matter in the flue gas reaction flue.

[0009] Furthermore, a manual feeding bin is provided at the manhole of the flue gas reaction flue near the desulfurization injection point, and the discharge end of the manual feeding bin is connected to a feeding pipe through a manual butterfly valve, and the discharge end of the feeding pipe passes through the manhole and extends into the flue gas reaction flue. It is found that baking soda cannot enter the flue after blockage, and baking soda is added by manual feeding, so that the desulfurization system is continuously fed, ensuring that the desulfurization effect can still be guaranteed during the pipe blockage.

[0010] Furthermore, a nitrogen channel is connected to the feed pipe outside the flue gas reaction flue, and the ammonia channel can assist the manual feed to enter the flue gas reaction flue.

[0011] Furthermore, the angle between the gas purge direction at the outlet end of the turbulent branch located at the elbow connection position and the gas flow direction in the flue gas reaction flue is 30°.

[0012] Furthermore, the gas purge direction of the outlet end of the spoiler branch at the flange connection position and the gas flow direction in the flue gas reaction flue are at an angle of 45°, so as to facilitate blowing out the blockage in the flange gap.

[0013] Furthermore, the gas purge direction at the outlet end of the turbulent branch located at the tee connection position is at an angle of 60° to the air flow direction in the flue gas reaction flue, which facilitates the cleaning of blockages in the two inlet pipes of the tee pipe.

[0014] Furthermore, the locations prone to blockage include tee connections, flange connections and elbows.

[0015] The utility model has the following advantages and technical effects: due to the adoption of the above technical scheme, the blockage of the desulfurization system can be reduced, the blockage location can be discovered and processed in time, the safe and stable operation of the desulfurization system can be ensured, and the desulfurization effect can be guaranteed; it can avoid the baking soda powder from being backflowed into the room due to blockage, posing a threat to the indoor environment, the safe operation of electrical equipment and the health of personnel.

[0016] Adding turbulence branches at locations prone to blockage and using compressed air or nitrogen to blow into the flue gas reaction flue can help clean the flue and keep it unobstructed and free of material accumulation. When blockage occurs, the gas blown by the turbulence branches can also effectively clear the blocked materials. If pressure buildup or flue blockage occurs, the blockage point can be quickly determined through the pressure feedback of the pressure transmitter, and the purge gas volume can be increased in a targeted manner. The blockage point can be cleared in time by removing the pipeline to ensure that the system quickly restores the desulfurization effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the flue gas desulfurization system in the utility model;

[0018] Figure 2 It is a schematic diagram of the overall structure provided by an embodiment of the utility model;

[0019] Figure 3 It is a schematic diagram of the connecting structure of the flow disturbance branch at the bend provided by the embodiment of the utility model;

[0020] Figure 4 It is a schematic diagram of the connection structure of the spoiler branch at the three-way connection provided by the embodiment of the utility model;

[0021] Figure 5 It is a schematic diagram of the flow disturbance branch connection structure at the flange connection provided by the embodiment of the utility model;

[0022] Figure 6 It is a schematic diagram of the installation structure of the manual feeding bin provided in an embodiment of the utility model.

[0023] In the figure: 1. Feeding bin; 2. Grinding and sorting machine; 3. Screw feeder; 4. Flue gas reaction flue; 5. Turbine main circuit; 6. Gas source main valve; 7. Turbine branch circuit; 8. Pressure transmitter; 9. Controller; 10. Pulse valve; 11. Manual feeding bin 1; 12. Feed pipe; 13. Nitrogen channel. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail in combination with the embodiments below. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not used to limit the utility model.

[0025] It should be noted that the terms "upper", "lower", "left", "right", "top", "bottom", etc. indicate directions or positional relationships based on the directions 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 direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0026] like Figure 1 As shown, the flue gas desulfurization system includes a feeding bin 1 and two grinding and sorting integrated machines 2. The discharge port of the feeding bin 1 transports the materials to the feed ports of the two grinding and sorting integrated machines 2 through a screw feeder 3. The materials are ground and sorted by the grinding and sorting integrated machines 2. Under the action of the sorting fan, the ultra-fine baking soda is sprayed into the flue gas reaction flue 4 through a pipeline. The baking soda powder fully reacts with acidic substances such as SO2 in the flue gas. The specific principle is as follows: Sodium bicarbonate (baking soda, NaHCO3) fine powder is directly sprayed into the high-temperature flue gas. At high temperature, sodium bicarbonate is highly reactive in an instant and reacts with SO2 to complete the desulfurization and purification of the flue gas. NaHCO3+SO2+O2→Na2SO4+CO2+H2O.

[0027] like Figures 2 to 6 As shown, the present application provides a desulfurization system reaction flue dredging device, including a disturbance flow main circuit 5 connected to an external gas source, a gas source main valve 6 is arranged on the disturbance flow main circuit 5, and the disturbance flow main circuit 5 is divided into a plurality of disturbance flow branches 7 according to each easily blocked position on the flue gas reaction flue 4, and the gas outlet end of each disturbance flow branch 7 is connected to the flue gas reaction flue 4 at the corresponding easily blocked position. Specifically, the easily blocked positions include but are not limited to tee connections, flange connections, and elbows.

[0028] The outlet end of each spoiler branch 7 is provided with a pressure transmitter 8, and the inlet end of each spoiler branch 7 is provided with a pulse valve 10. The pressure transmitter 8 and the pulse valve 10 are both electrically connected to the controller 9. The pressure transmitter 8 transmits the outlet pressure data of the corresponding spoiler branch 7 outlet to the controller 9, and adjusts the opening and closing degree of the pulse valve 10 according to the outlet pressure data of the spoiler branch 7 outlet. If the outlet pressure of the spoiler branch 7 outlet increases or decreases sharply, or exceeds the normal range, the controller 9 in the main control room controls the sound and light alarm to alarm, reminding the staff to check whether the pipeline is blocked and deal with it in time.

[0029] The main disturbance path 5 is connected to a compressed air or nitrogen source. The cost of using compressed air is low in spring, autumn and winter. The easily blocked positions of the flue gas reaction flue 4 can be purged twice a month. In summer, the water content of compressed air is high, and baking soda is more likely to harden. It is replaced with nitrogen and the purging frequency is increased. The easily blocked positions of the flue gas reaction flue 4 are purged by jet once a week, and the purging frequency can also be adjusted as appropriate according to the baking soda blockage situation. On the one hand, regular purging of the flue gas reaction flue 4 can help clean the pipeline and keep it unobstructed without material accumulation. On the other hand, if there is a pressure buildup, the flue gas reaction flue 4 is severely blocked, and baking soda cannot be fed, the outlet pressure of the outlet end of the disturbance branch 7 can be observed by jet purging. The position where the pressure increases and cannot be purged is the blockage position. The blockage point can be quickly determined, and the purge gas volume of the disturbance branch 7 can be increased in a targeted manner. The pipeline can be removed and cleared in time to ensure that the equipment quickly restores the desulfurization effect.

[0030] Furthermore, the airflow direction in the spoiler branch 7 is set in the opposite direction to the airflow direction in the flue gas reaction flue 4, and the angle between the gas purge direction at the outlet end of the spoiler branch 7 and the airflow direction in the flue gas reaction flue 4 is 30° to 60°. Convection will be formed between the reversely flowing airflows, effectively reducing the deposition of particulate matter in the flue gas reaction flue 4.

[0031] Specifically, the gas purge direction at the outlet of the spoiler branch 7 at the elbow connection position and the gas flow direction in the flue gas reaction flue 4 are at an angle of 30°. The gas purge direction at the outlet of the spoiler branch 7 at the flange connection position and the gas flow direction in the flue gas reaction flue 4 are at an angle of 45°. It is convenient to blow out the blockage in the flange gap. The gas purge direction at the outlet of the spoiler branch 7 at the tee connection position and the gas flow direction in the flue gas reaction flue 4 are at an angle of 60°, which is convenient for cleaning the blockage in the two inlet pipes of the tee pipe.

[0032] Furthermore, a manual feeding bin 11 is provided at the manhole of the flue gas reaction flue 4 near the desulfurization injection point, and the discharge end of the manual feeding bin 11 is connected to a feed pipe 12 through a manual butterfly valve, and the discharge end of the feed pipe 12 passes through the manhole and extends into the flue gas reaction flue 4. Specifically, a mounting hole is opened at the manhole position, and the feed pipe 12 enters the flue gas reaction flue 4 through the mounting hole, with a depth of 700mm, and the feed pipe 12 is welded to the manhole. It was found that baking soda could not enter the flue after being blocked, and baking soda was added by manual feeding, so that the desulfurization system was continuously fed, ensuring that the desulfurization effect could still be guaranteed during the pipeline blockage.

[0033] Furthermore, the feed pipe 12 outside the flue gas reaction flue 4 is connected to a nitrogen channel 13. The ammonia channel can assist the manual feed to enter the flue gas reaction flue 4.

[0034] The adoption of the above technical solution can reduce the blockage of the desulfurization system, timely discover the blockage location and deal with it, ensure the safe and stable operation of the desulfurization system, and ensure the desulfurization effect; it can also prevent baking soda powder from flowing back into the room due to blockage, posing a threat to the indoor environment, the safe operation of electrical equipment and the health of personnel.

[0035] Adding a turbulent branch 7 at a location prone to blockage and using compressed air or nitrogen to blow into the flue gas reaction flue 4 can help clean the flue and keep it unobstructed and free of material accumulation. When a blockage problem occurs, the gas blown by the turbulent branch 7 can also effectively clear the blocked material. If there is a problem of pressure buildup or flue blockage, the blockage point can be quickly determined through the pressure feedback of the pressure transmitter 8, the purge gas volume can be increased in a targeted manner, and the blockage point can be cleared in time by removing the pipeline to ensure that the system quickly restores the desulfurization effect.

[0036] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A flue dredging device for a desulfurization system, characterized in that: It includes a disturbance flow main circuit connected to an external gas source, the disturbance flow main circuit is provided with a gas source main valve, the disturbance flow main circuit is divided into a plurality of disturbance flow branches according to each easily blocked position on the flue gas reaction flue, and the gas outlet end of each disturbance flow branch is connected to the flue gas reaction flue at the corresponding easily blocked position; A pressure transmitter is provided at the air outlet end of each of the spoiler branches, and a pulse valve is provided at the air inlet end of each of the spoiler branches. The pressure transmitter and the pulse valve are electrically connected to the controller. The pressure transmitter transmits the outlet pressure data of the corresponding spoiler branch outlet end to the controller, and adjusts the opening and closing degree of the pulse valve according to the outlet pressure data of the spoiler branch outlet end.

2. The desulfurization system reaction flue dredging device according to claim 1, characterized in that: The airflow direction in the spoiler branch is set in the opposite direction to the airflow direction in the flue gas reaction flue, and the angle between the gas purge direction at the outlet end of the spoiler branch and the airflow direction in the flue gas reaction flue is 30° to 60°.

3. The desulfurization system reaction flue dredging device according to claim 1 or 2, characterized in that: A manual charging bin is provided at the manhole of the flue gas reaction flue near the desulfurization injection point. The discharge end of the manual charging bin is connected to a feed pipe through a manual butterfly valve. The discharge end of the feed pipe passes through the manhole and extends into the flue gas reaction flue.

4. The desulfurization system reaction flue dredging device according to claim 3 is characterized in that: The feed conveying pipe located outside the flue gas reaction flue is connected with a nitrogen channel.

5. The desulfurization system reaction flue dredging device according to claim 2, characterized in that: The included angle between the gas purge direction at the outlet end of the turbulent branch located at the elbow connection position and the gas flow direction in the flue gas reaction flue is 30°.

6. The desulfurization system reaction flue dredging device according to claim 2, characterized in that: The angle between the gas purge direction at the outlet end of the turbulent branch located at the flange connection position and the gas flow direction in the flue gas reaction flue is 45°.

7. The desulfurization system reaction flue dredging device according to claim 2, characterized in that: The angle between the gas purge direction at the outlet end of the turbulent branch located at the three-way connection position and the gas flow direction in the flue gas reaction flue is 60°.

8. The desulfurization system reaction flue dredging device according to claim 1, characterized in that: The easily blocked positions include three-way connections, flange connections and elbows.

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