A boiler flue gas treatment device

Abstract

The utility model relates to flue gas treatment technical field, and disclose a kind of boiler flue gas treatment device, including desulfurizing tower, the bottom of the desulfurizing tower is fixedly connected with solution pool, the inside of the solution pool is equipped with sodium hydroxide solution, the right side of the solution pool is fixedly installed with alkali concentration sensor, transmitter and no. The utility model is by using when alkali concentration sensor detects that the concentration of sodium hydroxide in solution pool is lower than set threshold, signal will be transmitted to pump body controller by transmitter, no. 2 liquid pump is automatically started, high concentration sodium hydroxide solution is extracted from liquid storage tank and injected into solution pool, and high concentration solution is injected and original solution is mixed uniformly quickly by motor drive rotating shaft driving stirring rod rotation, to avoid local concentration too high or too low, to ensure that desulfurization reaction continues efficiently, avoid the problem that traditional desulfurizing tower causes desulfurization efficiency to reduce due to solution concentration drop, improve flue gas treatment quality.

Description

Technical Field

[0001] This utility model relates to the field of flue gas treatment technology, and more specifically to a boiler flue gas treatment device. Background Technology

[0002] A boiler is an energy conversion device that heats water into steam, high-temperature water, or organic heat carriers by burning fuels (such as coal, oil, or gas) or using electricity, providing heat energy for industrial production and daily life. The flue gas produced during boiler combustion often contains particulate impurities and harmful substances such as sulfur dioxide, causing serious environmental pollution. Therefore, it needs to be purified before being released. The removal of sulfur dioxide from boiler flue gas typically involves spraying a sodium hydroxide solution into a desulfurization tower. The sodium hydroxide solution reacts chemically with the sulfur dioxide in the flue gas to produce sodium sulfite and water, thus achieving desulfurization. However, in traditional desulfurization towers, the concentration of the sodium hydroxide solution gradually decreases during the absorption process. When the concentration drops to a certain level, the absorption efficiency for sulfur dioxide decreases significantly, failing to effectively complete the desulfurization task and resulting in excessive sulfur dioxide levels in the emitted flue gas. This requires improvement. Utility Model Content

[0003] In order to overcome the above-mentioned defects of the prior art, the present invention provides a boiler flue gas treatment device to solve the problems existing in the background art.

[0004] This utility model provides the following technical solution: a boiler flue gas treatment device, including a desulfurization tower, a solution tank fixedly connected to the bottom of the desulfurization tower, a sodium hydroxide solution inside the solution tank, an alkali concentration sensor, a transmitter and a first pump fixedly installed on the right side of the solution tank, the detection end of the alkali concentration sensor extending into the interior of the solution tank, the alkali concentration sensor and the transmitter being signal-connected, a storage tank on the right side of the solution tank, a high-concentration sodium hydroxide solution inside the storage tank, a second pump fixedly installed on the lower left side of the storage tank, an input end of the second pump fixedly connected to a first delivery pipe, one end of the first delivery pipe fixedly installed on the lower left side of the solution tank, an output end of the second pump fixedly connected to a second delivery pipe, one end of the second delivery pipe fixedly installed on the upper right side of the solution tank, a pump controller fixedly installed on the left side of the storage tank, the transmitter and the pump controller being signal-connected.

[0005] Furthermore, three spray pipes are fixedly installed inside the desulfurization tower, and multiple atomizing nozzles are fixedly installed at the bottom of each of the three spray pipes. The three spray pipes are distributed from top to bottom inside the desulfurization tower. A flue gas inlet is fixedly installed on the left side of the desulfurization tower. A demister is fixedly installed at the top inside the desulfurization tower. An exhaust pipe is fixedly connected to the middle of the top of the desulfurization tower.

[0006] Furthermore, a first conduit is fixedly installed at the input end of the first pump, one end of which extends into the interior of the solution pool. A second conduit is fixedly installed at the output end of the first pump. Three water distribution pipes are fixedly connected to the upper left side of the second conduit. One end of each water distribution pipe is fixedly connected to the right side of three spray pipes. The two ends of each water distribution pipe are respectively connected to the interior of the second conduit and the spray pipes.

[0007] Furthermore, a motor is fixedly installed on the left side of the solution tank, the output end of the motor extends into the interior of the solution tank and is fixedly connected to a rotating shaft via a coupling, the right end of the rotating shaft is rotatably installed on the right side of the inner wall of the solution tank, and multiple stirring rods are fixedly installed on the outer wall of the rotating shaft.

[0008] Furthermore, an inlet pipe is fixedly installed on the upper left side of the solution pool, and a drain pipe is fixedly installed on the lower left side of the solution pool.

[0009] Furthermore, an ultrasonic water level sensor, an alarm controller, and an alarm are fixedly installed on the top of the liquid storage tank. The detection end of the ultrasonic water level sensor extends to the upper part of the liquid storage tank. The ultrasonic water level sensor is connected to the alarm controller, and the alarm controller is connected to the alarm. A liquid filling port is provided on the right side of the top of the liquid storage tank, and a protective cover is threaded inside the liquid filling port.

[0010] The technical effects and advantages of this utility model are as follows: 1. This utility model employs a method where, when the alkali concentration sensor detects that the sodium hydroxide concentration in the solution tank is lower than a set threshold, a signal is transmitted to the pump controller via a transmitter. At this time, the second pump automatically starts, drawing high-concentration sodium hydroxide solution from the storage tank and injecting it into the solution tank. The motor drives the rotating shaft to rotate the stirring rod, ensuring that the injected high-concentration solution is quickly and evenly mixed with the original solution. This avoids local concentrations that are too high or too low, thus ensuring the continuous and efficient desulfurization reaction. It avoids the problem of reduced desulfurization efficiency caused by a decrease in solution concentration in traditional desulfurization towers, thereby improving the quality of flue gas treatment.

[0011] 2. This utility model facilitates the extraction of sodium hydroxide solution from the solution tank through the cooperation of a No. 1 conduit, a No. 1 liquid pump, a No. 2 conduit, and a water distribution pipe. The solution is then sprayed through atomizing nozzles below the three spray pipes, ensuring full contact between the flue gas and the sodium hydroxide solution. The three spray pipes are distributed sequentially from top to bottom, creating a multi-layer spraying effect and effectively improving the absorption efficiency of sulfur dioxide.

[0012] 3. This utility model uses an ultrasonic water level sensor to monitor the liquid level in the storage tank in real time. When the liquid level is lower than the safe value, the alarm controller will trigger the alarm to sound, reminding the operator to add high-concentration sodium hydroxide solution through the filling port in time. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0014] Figure 2 This is a schematic diagram of the overall structure of this utility model from another perspective.

[0015] Figure 3 This is a cross-sectional view of the overall structure of this utility model.

[0016] Figure 4 This is a cross-sectional schematic diagram of the liquid storage tank structure of this utility model.

[0017] The attached diagram is labeled as follows: 1. Desulfurization tower; 2. Solution tank; 21. Pipe No. 1; 22. Pump No. 1; 23. Pipe No. 2; 24. Water distribution pipe; 25. Spray pipe; 26. Atomizing nozzle; 3. Storage tank; 31. Inlet pipe No. 1; 32. Pump No. 2; 33. Inlet pipe No. 2; 4. Alkali concentration sensor; 5. Transmitter; 6. Pump controller; 7. Motor; 8. Rotating shaft; 9. Stirring rod; 10. Flue gas inlet; 11. Demister; 12. Exhaust pipe; 13. Inlet pipe; 14. Drain pipe; 15. Ultrasonic water level sensor; 16. Alarm controller; 17. Alarm. Detailed Implementation

[0018] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. In addition, the forms of the various structures described in the following embodiments are merely illustrative. The boiler flue gas treatment device involved in this utility model is not limited to the structures described in the following embodiments. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0019] Example 1: like Figure 1-4As shown, a boiler flue gas treatment device includes a desulfurization tower 1. A solution tank 2 is fixedly connected to the bottom of the desulfurization tower 1. The solution tank 2 contains a sodium hydroxide solution. An alkali concentration sensor 4, a transmitter 5, and a first-stage pump 22 are fixedly installed on the right side of the solution tank 2. Three spray pipes 25 are fixedly installed inside the desulfurization tower 1. Multiple atomizing nozzles 26 are fixedly installed at the bottom of each of the three spray pipes 25. The three spray pipes 25 are distributed from top to bottom inside the desulfurization tower 1. A flue gas inlet 10 is fixedly installed on the left side of the desulfurization tower 1. A demister 11 is fixedly installed above the top of the desulfurization tower 1. An exhaust pipe 12 is fixedly connected to the middle of the top of the desulfurization tower 1. A first conduit 21 is fixedly installed at the input end of the first liquid pump 22. One end of the first conduit 21 extends into the interior of the solution pool 2. A second conduit 23 is fixedly installed at the output end of the first liquid pump 22. Three water distribution pipes 24 are fixedly connected to the upper left side of the second conduit 23. One end of the three water distribution pipes 24 is fixedly connected to the right side of the three spray pipes 25. The two ends of the water distribution pipes 24 are respectively connected to the interior of the second conduit 23 and the spray pipes 25.

[0020] In this embodiment, the sodium hydroxide solution inside the solution pool 2 is easily extracted through the cooperation of the first conduit 21, the first liquid pump 22, the second conduit 23, and the water distribution pipe 24. The solution is then sprayed through the atomizing nozzles 26 below the three spray pipes 25. When the boiler flue gas enters from the left flue gas inlet 10, it passes through three spray areas at different heights in sequence. The liquid film formed by each spray layer fully contacts and reacts with the sulfur dioxide in the flue gas, effectively prolonging the gas-liquid contact time. After being treated by multiple spray layers, the flue gas rises to the demister 11 area, where the demister 11 removes the carried droplets, and the gas is then discharged from the top exhaust pipe 12.

[0021] Example 2: like Figure 1-4As shown, the detection end of the alkali concentration sensor 4 extends into the interior of the solution tank 2. The alkali concentration sensor 4 is connected to the transmitter 5 via a signal connection. A storage tank 3 is located on the right side of the solution tank 2, and the storage tank 3 contains a high-concentration sodium hydroxide solution. A second pump 32 is located on the lower left side of the storage tank 3. The input end of the second pump 32 is fixedly connected to a first infusion pipe 31, and one end of the first infusion pipe 31 is fixedly installed on the lower left side of the solution tank 2. The output end of the second pump 32 is fixedly connected to a second infusion pipe 33, and one end of the second infusion pipe 33... A pump controller 6 is fixedly installed on the upper right side of the solution tank 2. A transmitter 5 is connected to the pump controller 6 via a signal connection. A motor 7 is fixedly installed on the left side of the solution tank 2. The output end of the motor 7 extends into the interior of the solution tank 2 and is fixedly connected to a rotating shaft 8 via a coupling. The right end of the rotating shaft 8 is rotatably installed on the right side of the inner wall of the solution tank 2. Multiple stirring rods 9 are fixedly installed on the outer wall of the rotating shaft 8. An inlet pipe 13 is fixedly installed on the upper left side of the solution tank 2. Drain pipes 14 are fixedly installed on the lower left side of the solution tank 2.

[0022] In this embodiment, when the alkali concentration sensor 4 detects that the concentration of sodium hydroxide solution in solution tank 2 is lower than the preset value, the transmitter 5 immediately transmits the signal to the pump controller 6. At this time, the second pump 32 starts and draws high-concentration sodium hydroxide solution from the storage tank 3 through the first delivery pipe 31, and injects it into the upper right side of solution tank 2 through the second delivery pipe 33. During the injection process, the motor 7 operates synchronously, driving the rotating shaft 8 and the stirring rod 9 to rotate, and thoroughly stirring the solution to make the high-concentration solution quickly and evenly mixed with the original solution, avoiding local concentration differences and ensuring that the desulfurization reaction continues to proceed efficiently. After the solution concentration returns to the normal range, the pump controller 6 automatically stops the second pump. Pump 32 operates without manual intervention during the entire adjustment process, effectively solving the problem of reduced desulfurization efficiency caused by a decrease in solution concentration in traditional desulfurization tower 1. Simultaneously, the inlet pipe 13 and outlet pipe 14 facilitate the periodic replacement of all solutions in solution tank 2, ensuring long-term stable system operation. The alkali concentration sensor 4 can be model SJG-3083-16. The concentration of sodium hydroxide solution inside solution tank 2 can be 5% to 20%, which varies depending on specific process conditions. Some influencing factors may include fuel type, combustion temperature, flue gas velocity, gas composition, etc. Therefore, the actual concentration needs to be adjusted according to specific circumstances to ensure optimal desulfurization effect.

[0023] Example 3: like Figure 1-4As shown, an ultrasonic water level sensor 15, an alarm controller 16, and an alarm 17 are fixedly installed on the top of the liquid storage tank 3. The detection end of the ultrasonic water level sensor 15 extends to the upper part of the inside of the liquid storage tank 3. The ultrasonic water level sensor 15 is connected to the alarm controller 16, and the alarm controller 16 is connected to the alarm 17. A liquid filling port is provided on the right side of the top of the liquid storage tank 3, and a protective cover is connected to the internal thread of the liquid filling port.

[0024] In this embodiment, the ultrasonic water level sensor 15 can monitor the liquid level of the high-concentration sodium hydroxide solution in the storage tank 3 in real time. When the liquid level drops to the preset safety lower limit, it will immediately transmit the signal to the alarm controller 16. The alarm controller 16 will then trigger the alarm 17 to emit a clear prompt sound, reminding the operator to replenish the high-concentration sodium hydroxide solution in the storage tank 3 through the filling port in time. After replenishment, tighten the protective cap to prevent the solution from being contaminated.

[0025] In summary, as Figure 1-4 As shown, in this boiler flue gas treatment device, the flue gas generated by the boiler first enters from the flue gas inlet 10 on the left side of the desulfurization tower 1. At this time, the solution tank 2 already contains a sodium hydroxide solution of appropriate concentration. During the rise of the flue gas, it passes through the three-layer spray pipe 25 area in sequence. The first pump 22 extracts the sodium hydroxide solution from the solution tank 2 through the first conduit 21, and transports it to the three water distribution pipes 24 through the second conduit 23. Then, the water distribution pipes 24 distribute it to each spray pipe 25, and finally, it forms a fine water mist through the atomizing nozzles 26 and sprays it downwards. The flue gas comes into full contact with the water mist, and the sulfur dioxide in it reacts chemically with the sodium hydroxide to generate substances such as sodium sulfite, thereby achieving the purpose of desulfurization. After the three-layer spray treatment, Sulfur dioxide is removed from the flue gas, which then continues to rise to the demister 11 area. The demister 11 intercepts the liquid droplets carried in the flue gas, making the gas cleaner. Finally, the treated gas is discharged from the exhaust pipe 12 at the top of the desulfurization tower 1. During the desulfurization process, the alkali concentration sensor 4 monitors the concentration of sodium hydroxide solution in the solution pool 2 in real time. When the concentration is lower than the set threshold, the transmitter 5 transmits the signal to the pump controller 6. The pump controller 6 controls the second pump 32 to start, drawing high-concentration sodium hydroxide solution from the storage tank 3 and injecting it into the solution pool 2. At the same time, the output end of the motor 7 drives the rotating shaft 8 and the stirring rod 9 to rotate, so that the injected high-concentration solution is quickly and evenly mixed with the original solution, ensuring that the desulfurization reaction continues to proceed efficiently.

[0026] All standard parts used in this application can be purchased from the market, and can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art. The installation methods between equipment are also the same as conventional installation methods in the prior art. For example, the connection position of valve components is provided with anti-leakage rubber strips, the outside of threaded rods or lead rods is provided with dust covers, and the equipment can be driven by either built-in batteries or external power supply. The control method is automatic control by a controller. The control circuit of the controller can be implemented by simple programming by those skilled in the art and is common knowledge in the field. Since this utility model is mainly used to protect mechanical devices, this utility model will not explain the control method and circuit connection in detail. The controller can be an external controller or installed in a position that does not affect the use of this device. The controller can play a control role for the electrical components mentioned in this document, and the controller is a conventional known device.

[0027] Finally, the following points should be noted: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installation", "connection", and "linkage" should be interpreted broadly, and can be mechanical or electrical connections, or internal connections between two components, or direct connections. "Up", "down", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may change. Secondly: The accompanying drawings of the embodiments disclosed in this utility model only involve the structures involved in the embodiments disclosed in this utility model. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this utility model can be combined with each other. Finally: The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A boiler flue gas treatment device, comprising a desulfurization tower (1), characterized in that, The bottom of the desulfurization tower (1) is fixedly connected to a solution tank (2). The solution tank (2) contains a sodium hydroxide solution. An alkali concentration sensor (4), a transmitter (5), and a first-stage pump (22) are fixedly installed on the right side of the solution tank (2). The detection end of the alkali concentration sensor (4) extends into the interior of the solution tank (2). The alkali concentration sensor (4) and the transmitter (5) are connected by a signal. A storage tank (3) is located on the right side of the solution tank (2). The storage tank (3) contains a high-concentration sodium hydroxide solution. 3) A second liquid pump (32) is provided on the lower left side. The input end of the second liquid pump (32) is fixedly connected to a first infusion pipe (31). One end of the first infusion pipe (31) is fixedly installed on the lower left side of the solution pool (2). The output end of the second liquid pump (32) is fixedly connected to a second infusion pipe (33). One end of the second infusion pipe (33) is fixedly installed on the upper right side of the solution pool (2). A pump body controller (6) is fixedly installed on the left side of the storage tank (3). The transmitter (5) is connected to the pump body controller (6) via signal.

2. The boiler flue gas treatment device according to claim 1, characterized in that: The desulfurization tower (1) is equipped with three spray pipes (25) fixedly installed inside. Each of the three spray pipes (25) is equipped with multiple atomizing nozzles (26) fixedly installed at the bottom. The three spray pipes (25) are distributed from top to bottom inside the desulfurization tower (1). A flue gas inlet (10) is fixedly installed on the left side of the desulfurization tower (1). A demister (11) is fixedly installed at the top of the desulfurization tower (1). An exhaust pipe (12) is fixedly connected to the middle of the top of the desulfurization tower (1).

3. The boiler flue gas treatment device according to claim 1, characterized in that: The input end of the first pump (22) is fixedly installed with a first conduit (21), one end of which extends into the interior of the solution pool (2). The output end of the first pump (22) is fixedly installed with a second conduit (23). Three water distribution pipes (24) are fixedly connected to the upper left side of the second conduit (23). One end of the three water distribution pipes (24) is fixedly connected to the right side of the three spray pipes (25). The two ends of the water distribution pipes (24) are respectively connected to the interior of the second conduit (23) and the spray pipes (25).

4. The boiler flue gas treatment device according to claim 1, characterized in that: A motor (7) is fixedly installed on the left side of the solution tank (2). The output end of the motor (7) extends into the interior of the solution tank (2) and is fixedly connected to a rotating shaft (8) via a coupling. The right end of the rotating shaft (8) is rotatably installed on the right side of the inner wall of the solution tank (2). Multiple stirring rods (9) are fixedly installed on the outer wall of the rotating shaft (8).

5. A boiler flue gas treatment device according to claim 1, characterized in that: An inlet pipe (13) is fixedly installed on the upper left side of the solution pool (2), and a drain pipe (14) is fixedly installed on the lower left side of the solution pool (2).

6. The boiler flue gas treatment device according to claim 1, characterized in that: An ultrasonic water level sensor (15), an alarm controller (16), and an alarm (17) are fixedly installed on the top of the liquid storage tank (3). The detection end of the ultrasonic water level sensor (15) extends to the top inside the liquid storage tank (3). The ultrasonic water level sensor (15) is connected to the alarm controller (16) and the alarm controller (16) is connected to the alarm (17). A filling port is provided on the right side of the top of the liquid storage tank (3). A protective cover is threaded inside the filling port.

Images