Reaction device for flue gas desulfurization, denitrification and defluorination

Abstract

The utility model relates to the technical field of flue gas treatment, in particular to a reaction device for flue gas desulfurization, denitrification and defluorination, which comprises a desulfurization box, a defluorination box and a denitrification box which are sequentially connected through pipelines, and further comprises a limestone powder box and a pulping box, and limestone powder is added into the pulping box by the limestone powder box through a spiral discharging mechanism at the bottom of the limestone powder box; the spiral discharging mechanism is driven by a discharging motor, the limestone powder box, the spiral discharging mechanism and the discharging motor are all mounted on a supporting plate, and a weighing sensor is arranged in the supporting plate; a first pump body used for adding quantitative water into the pulping box through a water pipe is installed on the side face of the pulping box. The system has the advantages of automatically blending the limestone slurry, monitoring the reaction condition of the limestone slurry and ensuring the desulfurization efficiency and quality, and solves the problems that the desulfurization efficiency of manually blending the limestone slurry is low, the reaction condition of the limestone slurry cannot be monitored and the flue gas desulfurization is influenced.

Description

Technical Field

[0001] The utility model relates to the technical field of flue gas treatment, in particular to a reaction device for desulfurization, denitrification and defluorination of flue gas. Background Technique

[0002] Flue gas desulfurization, denitrification and defluorination are important technologies in industrial emission control for reducing the emission of atmospheric pollutants. Desulfurization mainly targets sulfur dioxide (SO2), denitrification targets nitrogen oxides (NO X )), and defluorination is to remove fluoride (F - ) in the flue gas.

[0003] Desulfurization usually adopts the limestone-gypsum method, that is, limestone powder is made into slurry by adding water as an absorbent, and reacts with SO2 in the flue gas to generate calcium sulfate (gypsum). Using the above method requires preparing limestone slurry in advance and recycling and reprocessing the gypsum after the reaction. However, the existing technology uses manual preparation of limestone slurry with low efficiency and cannot effectively monitor the reaction of limestone slurry. If the limestone slurry has been completely converted into gypsum and not replaced in time, it will directly affect the desulfurization of flue gas. Therefore, we propose a reaction device for desulfurization, denitrification and defluorination of flue gas. Content of the Utility Model

[0004] The purpose of the utility model is to provide a reaction device for desulfurization, denitrification and defluorination of flue gas, which has the advantages of automatically preparing limestone slurry and monitoring the reaction of limestone slurry to ensure desulfurization efficiency and quality, and solves the problems of low desulfurization efficiency of manual preparation of limestone slurry and inability to monitor the reaction of limestone slurry, which affects flue gas desulfurization.

[0005] To achieve the above purpose, the utility model provides the following technical solution: A reaction device for desulfurization, denitrification and defluorination of flue gas, including a desulfurization tank, a defluorination tank and a denitrification tank connected in sequence through pipelines, and also including a limestone powder tank and a pulping tank. The limestone powder tank adds limestone powder into the pulping tank through a spiral discharging mechanism at its bottom; the spiral discharging mechanism is driven by a discharging motor. The limestone powder tank, the spiral discharging mechanism and the discharging motor are all installed on a support plate, and a weighing sensor is arranged inside the support plate;

[0006] A pump body I and a water pipe are installed on the side of the pulping tank, and a flow valve I is arranged on the water pipe. The pump body I is used to add a fixed amount of water into the pulping tank through the water pipe. The pulping tank is used to provide limestone slurry for the desulfurization tank, and a stirring mechanism is arranged inside the pulping tank.

[0007] Preferably, a flue gas pipeline is arranged on the desulfurization tank, and a liquid level gauge is arranged inside the desulfurization tank. The liquid level gauge is used to detect the slurry volume inside the desulfurization tank.

[0008] Preferably, a densitometer is provided inside the desulfurization tank, and the densitometer is used to monitor the conversion of limestone slurry into gypsum slurry.

[0009] Preferably, a controller is further included. The data of the weighing sensor, densitometer, and liquid level gauge are all sent to the controller. A second pump and a liquid outlet pipe are provided on the desulfurization tank, and the controller is used to control the operation of the discharging motor, the first pump, and the second pump.

[0010] Preferably, the desulfurization tank is connected to the defluorination tank through a first pipe, the defluorination tank is connected to the denitrification tank through a second pipe, and an adsorption plate and an exhaust pipe are provided inside the defluorination tank.

[0011] Preferably, the stirring mechanism includes a stirring motor installed at the bottom of the pulp making tank, and the output shaft of the stirring motor is connected to a stirring rod and a stirring frame inside the pulp making tank.

[0012] Preferably, a cavity is provided inside the pulp making tank, an air inlet pipe and an air outlet pipe are provided on the cavity, the air outlet pipe is connected to the defluorination tank, and the cavity is used to recover the heat generated by the reaction of limestone powder and water to heat the air entering from the air inlet pipe.

[0013] Preferably, the pulp making tank is connected to the desulfurization tank through a liquid inlet pipe, and a third pump and a second flow valve are provided on the liquid inlet pipe.

[0014] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0015] By providing an automated limestone powder tank, the present utility model can quantitatively add limestone powder into the pulp making tank, add a fixed amount of water through the first pump, convert calcium carbonate into calcium hydroxide solution, and add the limestone slurry, that is, calcium hydroxide solution, into the desulfurization tank to react with the flue gas, thereby absorbing sulfur dioxide in the flue gas to produce calcium sulfate, that is, gypsum. Since the densities of the limestone slurry and the gypsum slurry are different, the densitometer can measure whether the limestone slurry is completely converted into gypsum slurry, avoiding the influence of the gypsum slurry on the desulfurization effect. It solves the problems of low desulfurization efficiency of manually prepared limestone slurry and the inability to monitor the reaction of limestone slurry, which affects flue gas desulfurization. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic structural diagram of the present utility model;

[0017] Figure 2 is a schematic structural diagram of the pulp making tank of the present utility model.

[0018] In the figure: 1, desulfurization tank; 2, defluorination tank; 3, denitration tank; 4, limestone powder tank; 5, screw discharging mechanism; 6, discharging motor; 7, support plate; 8, weighing sensor; 9, pulping tank; 10, pump body I; 11, water pipe; 12, flow valve I; 13, flue gas pipe; 14, pipe I; 15, pipe II; 16, densitometer; 17, liquid level gauge; 18, controller; 19, pump body II; 20, liquid outlet pipe; 21, stirring motor; 22, stirring rod; 23, stirring frame; 24, cavity; 25, air inlet pipe; 26, air outlet pipe; 27, exhaust pipe; 28, adsorption plate; 29, liquid inlet pipe; 30, pump body III; 31, flow valve II. Detailed implementation mode

[0019] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0020] As Figure 1 and 2 shown, a reaction device for flue gas desulfurization, denitration and defluorination includes a desulfurization tank 1, a defluorination tank 2 and a denitration tank 3 connected in sequence through pipelines, and also includes a limestone powder tank 4 and a pulping tank 9. The limestone powder tank 4 adds limestone powder into the pulping tank 9 through the screw discharging mechanism 5 at its bottom; the screw discharging mechanism 5 is driven by a discharging motor 6. The limestone powder tank 4, the screw discharging mechanism 5 and the discharging motor 6 are all installed on the support plate 7, and a weighing sensor 8 is arranged inside the support plate 7; the weighing sensor 8 is used to weigh the total weight of the limestone powder tank 4, the screw discharging mechanism 5, the discharging motor 6 and the lime powder, and the addition amount of the limestone powder is obtained by detecting the weight reduction.

[0021] By setting an automated limestone powder tank 4, limestone powder can be quantitatively added into the pulping tank 9, and a quantitative amount of water is added through the pump body I 10 to convert calcium carbonate into calcium hydroxide solution. The limestone slurry, that is, calcium hydroxide solution, is added into the desulfurization tank 1 to react with the flue gas, thereby absorbing sulfur dioxide in the flue gas to produce calcium sulfate, that is, gypsum.

[0022] A pump body 10 and a water pipe 11 are installed on the side of the pulping tank 9, and a flow valve 12 is arranged on the water pipe 11. The pump body 10 is used to add a fixed amount of water into the pulping tank 9 through the water pipe 11. The pulping tank 9 is used to provide limestone slurry for the desulfurization tank 1, and a stirring mechanism is arranged in the pulping tank 9. The stirring mechanism includes a stirring motor 21 installed at the bottom of the pulping tank 9, and the output shaft of the stirring motor 21 is connected to a stirring rod 22 and a stirring frame 23 inside the pulping tank 9. The stirring motor 21 drives the stirring of limestone powder and water under the control of the controller 18.

[0023] A flue gas pipeline 13 is arranged on the desulfurization tank 1. Flue gas enters the desulfurization tank 1 through the flue gas pipeline 13 for desulfurization, then enters the adsorption plate 28 of the defluorination tank 2 for defluorination, and finally enters the denitration tank 3. At a relatively high temperature, a reducing agent is directly sprayed into the flue gas of the denitration tank 3 to react with NO X A liquid level gauge 17 is arranged in the desulfurization tank 1, and the liquid level gauge 17 can detect the amount of slurry in the desulfurization tank 1.

[0024] A densitometer 16 is arranged inside the desulfurization tank 1, and the densitometer 16 is used to monitor the conversion of limestone slurry into gypsum slurry. Since the densities of limestone slurry and gypsum slurry are different, the densitometer 16 can measure whether the limestone slurry is completely converted into gypsum slurry, avoiding the influence of gypsum slurry on the desulfurization effect. It solves the problems of low desulfurization efficiency of manually prepared limestone slurry and the inability to monitor the reaction of limestone slurry, which affects flue gas desulfurization.

[0025] It also includes a controller 18. The data of the weighing sensor 8, the densitometer 16, and the liquid level gauge 17 are all sent to the controller 18. A pump body 19 and a liquid outlet pipe 20 are arranged on the desulfurization tank 1. The controller 18 is used to control the operation of the discharging motor 6, the pump body 10, and the pump body 19. The controller 18 adopts a PLC control system.

[0026] The densitometer 16 of the limestone slurry adopts the differential pressure density measurement method. By measuring the pressure difference between two vertical points in the same vertical direction and integrating the measurement output signal of the differential pressure transmitter, the corresponding slurry density is calculated through the PLC control system.

[0027] The desulfurization tank 1 is connected to the defluorination tank 2 through a pipeline 14, and the defluorination tank 2 is connected to the denitration tank 3 through a pipeline 15. An adsorption plate 28 and an exhaust pipe 27 are arranged in the defluorination tank 2. The fluoride in the flue gas is directly adsorbed by using an activated carbon adsorption plate 28 or other adsorbents. The exhaust pipe 27 is used for exhausting after the activated carbon is desorbed.

[0028] The pulp making tank 9 is internally provided with a cavity 24. An air inlet pipe 25 and an air outlet pipe 26 are arranged on the cavity 24. The air outlet pipe 26 is connected to the defluorination tank 2. The cavity 24 is used to recover the heat generated by the reaction of limestone powder and water to heat the air entering from the air inlet pipe 25. Since a large amount of heat is released during the reaction of limestone powder and water, the heat is recovered through the cavity 24. The activated carbon adsorption plate 28 in the defluorination tank 2 needs to be desorbed by high-temperature air. By directly converting the heat generated by the reaction of limestone powder and water into air heat, the activated carbon adsorption plate 28 is desorbed. Valves are arranged on each pipeline connected to the defluorination tank 2. When the valves of the air outlet pipe 26 and the exhaust pipe 27 are opened, it is in the desorption state, and other pipelines are closed. When the valves of the pipeline one 14 and the pipeline two 15 are opened, it is in the defluorination state, and other valves are closed.

[0029] The pulp making tank 9 is connected to the desulfurization tank 1 through a liquid inlet pipe 29. A pump body three 30 and a flow valve two 31 are arranged on the liquid inlet pipe 29. The pump body three 30 pumps the limestone slurry in the pulp making tank 9 into the desulfurization tank 1 so that the desulfurization tank 1 can desulfurize the flue gas.

[0030] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A reaction device for flue gas desulfurization, denitrification and defluorination, comprising a desulfurization tank (1), a defluorination tank (2) and a denitrification tank (3) connected in sequence through pipelines, characterized in that: It also includes a limestone powder tank (4) and a pulping tank (9). The limestone powder tank (4) adds limestone powder into the pulping tank (9) through a screw discharging mechanism (5) at its bottom. The screw discharging mechanism (5) is driven by a discharging motor (6). The limestone powder tank (4), the screw discharging mechanism (5) and the discharging motor (6) are all installed on a support plate (7), and a weighing sensor (8) is arranged inside the support plate (7). A first pump (10) and a water pipe (11) are installed on the side of the pulping tank (9), and a first flow valve (12) is arranged on the water pipe (11). The first pump (10) is used to add a fixed amount of water into the pulping tank (9) through the water pipe (11). The pulping tank (9) is used to provide limestone slurry for the desulfurization tank (1), and a stirring mechanism is arranged inside the pulping tank (9).

2. The reaction device for flue gas desulfurization, denitrification and defluorination according to claim 1, characterized in that: A flue gas pipe (13) is arranged on the desulfurization tank (1), and a liquid level gauge (17) is arranged inside the desulfurization tank (1). The liquid level gauge (17) is used to detect the amount of slurry inside the desulfurization tank (1).

3. The reaction device for flue gas desulfurization, denitrification and defluorination according to claim 2, characterized in that: A densitometer (16) is arranged inside the desulfurization tank (1). The densitometer (16) is used to monitor the conversion of limestone slurry into gypsum slurry.

4. A reaction device for flue gas desulfurization, denitrification and defluorination according to claim 3, characterized in that: It also includes a controller (18). The data of the weighing sensor (8), the densitometer (16) and the liquid level gauge (17) are all sent to the controller (18). A second pump (19) and a liquid outlet pipe (20) are arranged on the desulfurization tank (1). The controller (18) is used to control the operation of the discharging motor (6), the first pump (10) and the second pump (19).

5. The reaction device for flue gas desulfurization, denitrification and defluorination according to claim 1, characterized in that: The desulfurization tank (1) is connected to a defluorination tank (2) through a first pipe (14). The defluorination tank (2) is connected to a denitration tank (3) through a second pipe (15). An adsorption plate (28) and an exhaust pipe (27) are arranged inside the defluorination tank (2).

6. The reaction device for flue gas desulfurization, denitrification and defluorination according to claim 1, characterized in that: The stirring mechanism includes a stirring motor (21) installed at the bottom of the pulping tank (9). The output shaft of the stirring motor (21) is connected to a stirring rod (22) and a stirring frame (23) inside the pulping tank (9).

7. The reaction device for flue gas desulfurization, denitrification and defluorination according to claim 5, characterized in that: A cavity (24) is arranged inside the pulping tank (9). An air inlet pipe (25) and an air outlet pipe (26) are arranged on the cavity (24). The air outlet pipe (26) is connected to the defluorination tank (2). The cavity (24) is used to recover the heat generated by the reaction of limestone powder and water to heat the air entering from the air inlet pipe (25).

8. A reaction device for flue gas desulfurization, denitrification and defluorination according to claim 1, characterized in that: The pulping tank (9) is connected to the desulfurization tank (1) through a liquid inlet pipe (29). A third pump (30) and a second flow valve (31) are arranged on the liquid inlet pipe (29).

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