Power plant boiler tail gas desulfurization and denitrification device

Abstract

The utility model discloses a power plant boiler tail gas desulfurization and denitrification device, which relates to the technical field of tail gas treatment and comprises an absorption tower, a tail gas inlet is arranged on the left side wall of the absorption tower, an air inlet pipe is arranged on the front outer wall of the absorption tower, and an oxidation fan is arranged at the rear end of the air inlet pipe. A first supporting frame is arranged at the upper end of the absorption tower, a stirring barrel is arranged at the upper end of the first supporting frame, a first liquid inlet pipe is arranged at the lower end of the stirring barrel, and the first liquid inlet pipe penetrates through the first supporting frame and the upper end of the absorption tower; a first electric ball valve is arranged on the outer wall of the first liquid inlet pipe between the first supporting frame and the absorption tower, and a flow dividing pipe is arranged at the lower end of the first liquid inlet pipe in the absorption tower. The desulfurization and denitrification device for the tail gas of the power plant boiler, disclosed by the utility model, has a better treatment effect on sulfides and nitrides contained in the tail gas, and has smaller influence on the air environment.

Description

TECHNICAL FIELD

[0001] The utility model relates to tail gas treatment technical field especially relates to a power plant boiler tail gas desulfurization and denitrification device. BACKGROUND

[0002] The power plant boiler is one of the main equipment of the thermal power station, usually uses with the steam turbine and the generator, through the heat energy of fuel conversion is the mechanical energy that steam turbine rotates, finally through the generator conversion becomes the electric energy, produces some harmful smoke and gas to the human body in the process of thermal power generation, therefore needs to use to desulfurization and denitrification device to carry out the purification to the gas.

[0003] The existing power plant boiler tail gas treatment device is usually not thorough enough to the sulfide and nitride contained in the tail gas during use, so that the discharged gas after treatment is still harmful and can affect the air environment, in order to solve the problem of prior art, we propose a power plant boiler tail gas desulfurization and denitrification device. UTILITY MODEL CONTENTS

[0004] The main purpose of the utility model is to provide a kind of power plant boiler tail gas desulfurization and denitrification device, can effectively solve the problem in background art.

[0005] To achieve the above-mentioned purpose, the technical scheme adopted by the utility model is as follows:

[0006] A desulfurization and denitrification device for power plant boiler flue gas includes an absorption tower. A flue gas inlet is located on the left side wall of the absorption tower. An air inlet pipe is located on the front outer wall of the absorption tower, and an oxidation fan is located at the rear end of the air inlet pipe. A support frame is located at the upper end of the absorption tower, and a stirring tank is located at the upper end of the support frame. A liquid inlet pipe is located at the lower end of the stirring tank, passing through the support frame and the upper end of the absorption tower. An electric ball valve is located on the outer wall of the liquid inlet pipe between the support frame and the absorption tower. A diversion pipe is located inside the absorption tower at the lower end of the liquid inlet pipe, and multiple sets of nozzles are located at the lower end of the diversion pipe. Fixing rods are located on both sides of the stirring tank at the upper end of the support frame. The upper ends of the two sets of fixing rods... An installation plate is installed above the mixing tank. A motor is installed in the middle of the upper end of the installation plate. A stirring rod is installed inside the mixing tank at the lower end of the installation plate. The motor is connected to the upper end of the stirring rod in the middle. A connecting pipe is installed on the right side wall of the absorption tower. A denitrification reactor is installed at the end of the connecting pipe. A support leg is installed at the lower end of the denitrification reactor. A sponge is installed inside the denitrification reactor. A second support frame is installed at the upper end of the denitrification reactor. A liquid ammonia tank is installed at the upper end of the second support frame. A second inlet pipe is installed at the lower end of the liquid ammonia tank. The second inlet pipe passes through the second support frame and the upper end of the denitrification reactor. A second electric ball valve is installed on the outer wall of the second inlet pipe below the second support frame. An exhaust pipe is installed on the outer wall of the denitrification reactor.

[0007] Preferably, a rotating interface is provided between the upper end of the stirring rod and the lower end of the mounting plate, and the upper end of the stirring rod is rotatably connected to the lower end of the mounting plate through the rotating interface.

[0008] Preferably, the mixing tank is filled with limestone slurry.

[0009] Preferably, a sealing ring is provided between the diversion pipe and the first inlet pipe, and the diversion pipe is sealed to the first inlet pipe through the sealing ring.

[0010] Preferably, the liquid ammonia tank is filled with liquid ammonia.

[0011] Preferably, the sponge contains a catalyst.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] 1. In this utility model, the absorption tower, stirring tank, denitrification reactor and liquid ammonia tank can fully treat the sulfides and nitrates contained in the boiler exhaust gas. Through chemical reaction, the sulfides and nitrates can be reduced to the maximum extent, resulting in better exhaust gas treatment and less impact on the air environment from the discharged gas.

[0014] 2、The utility model discloses a mounting plate and stirring rod are set up, can carry out the stirring of the limestone slurry in the stirring barrel, keep the fluidity of limestone slurry, prevent the solidification of limestone slurry, cause the internal portion of the absorption tower to be unable to enter, the sponge that sets up can make the liquid ammonia in the liquid ammonia tank fill the internal portion of denitration reactor, and the effect of tail gas treatment is better. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is the whole structure schematic drawing of the utility model;

[0016] Figure 2 It is the stirring barrel connecting structure schematic drawing of the utility model;

[0017] Figure 3 It is the stirring rod connecting structure schematic drawing of the utility model;

[0018] Figure 4 It is the denitration reactor split structure schematic drawing of the utility model.

[0019] In the drawing: 1, absorption tower;2, tail gas inlet;3, air inlet pipe;4, oxidation fan;5, no. 1 support frame;6, stirring barrel;7, connecting pipe;8, denitration reactor;9, support leg;10, fixed rod;11, mounting plate;12, no. 1 liquid inlet pipe;13, no. 1 electric ball valve;14, shunt pipe;15, spray head;16, stirring rod;17, motor;18, sponge;19, no. 2 support frame;20, liquid ammonia tank;21, no. 2 liquid inlet pipe;22, no. 2 electric ball valve;23, exhaust pipe. DETAILED DESCRIPTION

[0020] In order to make the technical means, creation features, purposes and effects of the utility model easy to understand, the utility model is further described below in combination with specific embodiments.

[0021] For example, Figures 1-3As shown, the absorption tower 1 is used for desulfurization treatment of tail gas, the left side wall of the absorption tower 1 is provided with a tail gas inlet 2, the tail gas enters the inside of the absorption tower 1 from the tail gas inlet 2, the front side outer wall of the absorption tower 1 is provided with an air inlet pipe 3, the rear end of the air inlet pipe 3 is provided with an oxidation fan 4, the oxidation fan 4 can deliver air into the inside of the absorption tower 1 through the air inlet pipe 3, accelerate the speed of tail gas reaction, improve the efficiency of tail gas treatment, the upper end of the absorption tower 1 is provided with a first support frame 5, the upper end of the first support frame 5 is provided with a stirring barrel 6, the first support frame 5 is used for supporting the stirring barrel 6, the inside of the stirring barrel 6 is used for containing limestone slurry, the limestone slurry can be used for desulfurization treatment of tail gas, the lower end of the stirring barrel 6 is provided with a first liquid inlet pipe 12, the first liquid inlet pipe 12 penetrates through the first support frame 5 and the upper end of the absorption tower 1, and delivers the limestone slurry into the inside of the absorption tower 1, the outer wall of the first liquid inlet pipe 12 is provided with a first electric ball valve 13 between the first support frame 5 and the absorption tower 1, the first electric ball valve 13 controls the opening and closing of the first liquid inlet pipe 12, the lower end of the first liquid inlet pipe 12 is provided with a flow divider 14 in the inside of the absorption tower 1, the lower end of the fixed rod 10 is provided with a plurality of nozzles 15, the flow divider 14 and the nozzles 15 can uniformly spray the limestone slurry in the inside of the absorption tower 1, and make the tail gas contact more fully, the upper end of the first support frame 5 is provided with a fixed rod 10 on both sides of the stirring barrel 6, the upper ends of the two fixed rods 10 are provided with a mounting plate 11 above the stirring barrel 6, the fixed rod 10 is used for fixing the mounting plate 11 and the first support frame 5, the upper end of the mounting plate 11 is provided with a motor 17 in the middle, the lower end of the mounting plate 11 is provided with a stirring rod 16 in the inside of the stirring barrel 6, the mounting plate 11 is used for installing the stirring rod 16, a rotating interface is arranged between the upper end of the stirring rod 16 and the lower end of the mounting plate 11, the stirring rod 16 can rotate at the lower end of the mounting plate 11, the motor 17 is connected with the upper end of the stirring rod 16 in the middle, the motor 17 can drive the stirring rod 16 to rotate in the inside of the stirring barrel 6, stir the limestone slurry in the inside of the stirring barrel 6, prevent solidification, the right side wall of the absorption tower 1 is provided with a connecting pipe 7, the tail of the connecting pipe 7 is provided with a denitration reactor 8, the connecting pipe 7 is used for connecting the denitration reactor 8 and the absorption tower 1, the denitration reactor 8 is used for denitration treatment of tail gas.

[0022] As Figure 4As shown, the lower end of the denitration reactor 8 is provided with a support leg 9 for supporting the denitration reactor 8, the inside of the denitration reactor 8 is provided with a sponge 18 which fills the inside of the denitration reactor 8, the inside of the sponge 18 is provided with a catalyst to improve the reaction speed, the upper end of the denitration reactor 8 is provided with a second support frame 19, the upper end of the second support frame 19 is provided with a liquid ammonia tank 20, the second support frame 19 is used for mounting the liquid ammonia tank 20, the inside of the liquid ammonia tank 20 is filled with liquid ammonia, the lower end of the liquid ammonia tank 20 is provided with a second liquid inlet pipe 21, the second liquid inlet pipe 21 passes through the upper end of the second support frame 19 and the denitration reactor 8, the second liquid inlet pipe 21 can transport the liquid ammonia in the liquid ammonia tank 20 into the inside of the denitration reactor 8, so that the liquid ammonia fills the middle of the sponge 18, when the tail gas passes through the middle of the sponge 18, the liquid ammonia and the catalyst can fully react, the outer wall of the second liquid inlet pipe 21 is provided with a second electric ball valve 22 below the second support frame 19, the second electric ball valve 22 is used for controlling the opening and closing of the second liquid inlet pipe 21, the outer wall of the denitration reactor 8 is provided with an exhaust pipe 23, the gas treated by the denitration reactor 8 is discharged outwardly from the exhaust pipe 23.

[0023] It should be noted that the utility model is a kind of power plant boiler tail gas desulfurization and denitration device, when using, first limestone powder and water are added to the inside of stirring barrel 6, motor 17 is started to drive stirring rod 16 to rotate in the inside of stirring barrel 6, limestone slurry is fully stirred, boiler tail gas enters the inside of absorption tower 1 from tail gas inlet 2, while oxidation fan 4 is started, air is transported into the inside of absorption tower 1 by air inlet pipe 3, first electric ball valve 13 opens first liquid inlet pipe 12, limestone slurry in the inside of stirring barrel 6 will flow into the middle of shunt pipe 14 from first liquid inlet pipe 12, then be sprayed downward by spray head 15, fully react with tail gas in the inside of absorption tower 1, carry out desulfurization treatment to tail gas, after treatment, tail gas enters the inside of denitration reactor 8 from connecting pipe 7, second electric ball valve 22 opens second liquid inlet pipe 21, liquid ammonia in the inside of liquid ammonia tank 20 will enter the middle of sponge 18 in the inside of denitration reactor 8 from second liquid inlet pipe 21, when tail gas passes through the middle of sponge 18, it will fully react with liquid ammonia, carry out denitration treatment, then be discharged outwardly from exhaust pipe 23.

[0024] The basic principle and main features of the utility model and the advantages of the utility model are shown and described above. Those skilled in the art should understand that the utility model is not limited to the above embodiments, and the above embodiments and descriptions in the specification are only to illustrate the principle of the utility model, and various changes and improvements can be made to the utility model without departing from the spirit and scope of the utility model, and these changes and improvements all fall within the scope of the utility model claimed. The scope of protection of the utility model is defined by the appended claims and their equivalents.

Claims

1. A desulfurization and denitrification device for boiler exhaust gas in power plants, comprising an absorption tower (1), characterized in that: The absorption tower (1) has a tail gas inlet (2) on its left side wall and an air inlet pipe (3) on its front outer wall. An oxidation fan (4) is located at the rear end of the air inlet pipe (3). A first support frame (5) is located at the upper end of the absorption tower (1). A stirring tank (6) is located at the upper end of the first support frame (5). A first liquid inlet pipe (12) is located at the lower end of the stirring tank (6). The first liquid inlet pipe (12) passes through the first support frame (5) and the upper part of the absorption tower (1). At the end, an electric ball valve (13) is installed on the outer wall of the first liquid inlet pipe (12) between the first support frame (5) and the absorption tower (1). A diversion pipe (14) is installed at the lower end of the first liquid inlet pipe (12) inside the absorption tower (1). Multiple sets of nozzles (15) are installed at the lower end of the diversion pipe (14). Fixed rods (10) are installed on both sides of the first support frame (5) on both sides of the mixing tank (6). Mounting plates (11) are installed on the upper ends of the two sets of fixed rods (10) above the mixing tank (6). A motor (17) is installed in the middle of the upper end of the mounting plate (11), and a stirring rod (16) is installed inside the stirring tank (6) at the lower end of the mounting plate (11). The motor (17) is connected to the middle of the upper end of the stirring rod (16). A connecting pipe (7) is installed on the right side wall of the absorption tower (1). A denitrification reactor (8) is installed at the end of the connecting pipe (7). A support leg (9) is installed at the lower end of the denitrification reactor (8). A sponge (18) is installed inside the denitrification reactor (8). The upper end of the denitrification reactor (8) is provided with a second support frame (19), the upper end of the second support frame (19) is provided with a liquid ammonia tank (20), the lower end of the liquid ammonia tank (20) is provided with a second inlet pipe (21), the second inlet pipe (21) passes through the second support frame (19) and the upper end of the denitrification reactor (8), the outer wall of the second inlet pipe (21) is provided with a second electric ball valve (22) below the second support frame (19), and the outer wall of the denitrification reactor (8) is provided with an exhaust pipe (23).

2. The desulfurization and denitrification device for power plant boiler exhaust gas according to claim 1, characterized in that: A rotating interface is provided between the upper end of the stirring rod (16) and the lower end of the mounting plate (11), and the upper end of the stirring rod (16) is rotatably connected to the lower end of the mounting plate (11) through the rotating interface.

3. The power plant boiler tail gas desulfurization and denitrification device according to claim 1, characterized in that: The mixing tank (6) is filled with limestone slurry.

4. The power plant boiler tail gas desulfurization and denitrification device according to claim 1, characterized in that: A sealing ring is provided between the diversion pipe (14) and the first inlet pipe (12), and the diversion pipe (14) is sealed to the first inlet pipe (12) through the sealing ring.

5. The desulfurization and denitrification device for power plant boiler tail gas according to claim 1, characterized in that: The liquid ammonia tank (20) is filled with liquid ammonia.

6. The desulfurization and denitrification device for power plant boiler exhaust gas according to claim 1, characterized in that: The sponge (18) contains a catalyst.

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