Dry-method thermal desorption tail gas demercuration device

Abstract

The utility model discloses a dry thermal desorption tail gas demercuration device which comprises a semi-dry tower, one side of the semi-dry tower is connected with a bag-type dust collector, the other side of the bag-type dust collector is provided with a heat exchanger, the other side of the heat exchanger is provided with a fluidized bed catcher, the other side of the fluidized bed catcher is connected with two pollution factor catchers, and the two pollution factor catchers are connected with the semi-dry tower. An ejector is further arranged between the heat exchanger and the fluidized bed trap, and a one-way pipe is arranged on the spray pipe. According to the dry-process thermal desorption tail gas mercury removal device, mercury-containing flue gas is cooled to a range which can be borne by the bag-type dust collector by utilizing the semi-drying tower, dust, mercury-containing particulate matters and elemental mercury in the flue gas are collected by utilizing the bag-type dust collector, and modified activated carbon or a high polymer material is sprayed into the closed conveying pipe II by utilizing the ejector; and smoke for adsorbing mercury is formed in the second conveying pipe, mercury removal powder and mercury-containing smoke are absorbed by utilizing modified activated carbon or a high polymer material in the fluidized bed trap, and pollutants are treated by utilizing the pollution factor trap according to actual requirements.

Description

Technical Field

[0001] The utility model relates to the field of flue gas treatment in coal-fired power plants, and specifically relates to a dry thermal desorption tail gas mercury removal device. Background Technique

[0002] The currently commonly used flue gas mercury removal process is as follows: mercury in the flue gas is oxidized into an ionic state and enters a solution such as sodium sulfide. A reaction occurs in the solution to form mercury sulfide precipitation. After multi-stage precipitation, filtration is carried out, and the precipitation is treated as hazardous waste. This kind of flue gas mercury removal process requires the use of a large amount of solution and also generates a large amount of waste, which is not conducive to environmental protection production. To solve the above problems, we propose a dry thermal desorption tail gas mercury removal device to improve the deficiencies of the existing technology. Content of the Utility Model

[0003] The technical problem to be solved by the utility model is to overcome the defects of the existing technology and provide a dry thermal desorption tail gas mercury removal device. To solve the above technical problems, the utility model provides the following technical solutions:

[0004] A dry thermal desorption tail gas mercury removal device of the utility model includes a semi-dry tower. One side of the semi-dry tower is connected to a bag filter. The other side of the bag filter is provided with a heat exchanger. The other side of the heat exchanger is provided with a fluidized bed trap. The other side of the fluidized bed trap is connected to two pollutant factor traps. A ejector is also provided between the heat exchanger and the fluidized bed trap. A spray pipe is connected to the ejector, and a check valve is provided on the spray pipe.

[0005] Preferably, an inner plate, a retaining disc, a spring and a sealing disc are arranged in the check valve. The inner plate and the retaining disc are fixed on the inner wall of the check valve. A through hole is opened at the center of the retaining disc. A spring is fixed at the center of the upper surface of the inner plate. The upper end of the spring passes through the through hole and is connected to the sealing disc, and the sealing disc is hermetically attached to the through hole.

[0006] Preferably, a first conveying pipe is connected between the semi-dry tower and the heat exchanger. A second fan is also connected to the heat exchanger. An air inlet pipe is arranged on one side of the semi-dry tower, and the two air outlet ends of the air inlet pipe are respectively connected to the first conveying pipe and the second fan.

[0007] Preferably, a first fan is also connected between the bag filter and the heat exchanger.

[0008] Preferably, the heat exchanger and the fluidized bed trap are connected through a second conveying pipe, and the other end of the spray pipe is connected to the second conveying pipe.

[0009] Preferably, a third fan is connected to the exhaust pipe of the pollutant factor trap, and a flow monitor is arranged on the air outlet pipe of the third fan.

[0010] Compared with the prior art, the beneficial effects achieved by the present utility model are as follows:

[0011] Let the flue gas pass through the semi-dry tower, bag filter, heat exchanger, fluidized bed trap and pollutant factor trap in sequence. Use the semi-dry tower to cool the mercury-containing flue gas to a range that the bag filter can withstand. Use the bag filter to collect dust, mercury-containing particulate matter and elemental mercury in the flue gas. Use the ejector to inject modified activated carbon or polymer material into the closed conveying pipe two to form a mercury-adsorbing smoke in the conveying pipe two. Use the modified activated carbon or polymer material in the fluidized bed trap to absorb the mercury removal powder and mercury-containing flue gas. Use the pollutant factor trap to treat pollutants according to actual needs. This dry thermal desorption tail gas mercury removal device first heats the pollutants to form mercury-containing flue gas or tail gas, and directly removes mercury in the flue gas without oxidizing mercury into an ionic solution, saving resources, reducing costs, not easily generating a large amount of waste, and being conducive to environmental protection production. Description of the Drawings

[0012] The drawings are used to provide a further understanding of the present utility model and constitute a part of the specification. Together with the embodiments of the present utility model, they are used to explain the present utility model and do not constitute a limitation to the present utility model. In the drawings:

[0013] Figure 1 is the overall structural schematic diagram of the present utility model;

[0014] Figure 2 is the internal structural schematic diagram of the one-way pipe in the present utility model;

[0015] Figure 3 is the structural schematic diagram of the one-way pipe when it is opened in the present utility model.

[0016] In the figure: 1, semi-dry tower; 2, bag filter; 3, heat exchanger; 4, ejector; 5, fluidized bed trap; 6, pollutant factor trap; 7, spray pipe; 8, one-way pipe; 9, inner plate; 10, retaining disc; 11, through hole; 12, spring; 13, sealing disc; 14, intake pipe; 15, fan one; 16, fan two; 17, conveying pipe one; 18, conveying pipe two; 19, fan three; 20, flow monitor. Detailed Embodiments

[0017] The following describes the preferred embodiments of the present utility model with reference to the drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present utility model and are not used to limit the present utility model. Embodiment

[0018] As Figures 1-3As shown in the figure, a dry thermal desorption tail gas mercury removal device includes a semi-dry tower 1. One side of the semi-dry tower 1 is connected to a bag filter 2. On the other side of the bag filter 2, there is a heat exchanger 3. On the other side of the heat exchanger 3, there is a fluidized bed trap 5. On the other side of the fluidized bed trap 5, there are two pollutant factor traps 6 connected. Between the heat exchanger 3 and the fluidized bed trap 5, there is also an ejector 4. The ejector 4 is connected to a spray pipe 7, and a check valve 8 is arranged on the spray pipe 7. Inside the check valve 8, there are an inner plate 9, a retaining plate 10, a spring 12, and a sealing plate 13. The inner plate 9 and the retaining plate 10 are fixed on the inner wall of the check valve 8. A through hole 11 is opened at the center of the retaining plate 10. The center of the upper surface of the inner plate 9 is fixed with a spring 12. The upper end of the spring 12 passes through the through hole 11 and is connected to the sealing plate 13, and the sealing plate 13 is hermetically attached to the through hole 11. A conveying pipe 17 is connected between the semi-dry tower 1 and the heat exchanger 3. A second fan 16 is also connected to the heat exchanger 3. An air inlet pipe 14 is arranged on one side of the semi-dry tower 1, and the two air outlet ends of the air inlet pipe 14 are respectively connected to the conveying pipe 17 and the second fan 16. A first fan 15 is also connected between the bag filter 2 and the heat exchanger 3. The heat exchanger 3 and the fluidized bed trap 5 are connected through a conveying pipe 18, and the other end of the spray pipe 7 is connected to the conveying pipe 18. An exhaust pipe of the pollutant factor trap 6 is connected to a third fan 19, and a flow monitor 20 is arranged on the air outlet pipe of the third fan 19, forming the overall structure of the dry thermal desorption tail gas mercury removal device, directly removing mercury from the flue gas without oxidizing mercury into an ionic solution, which is beneficial to environmental protection production.

[0019] Principle and advantages of the present utility model: Put modified activated carbon or polymer material into the fluidized bed trap 5. Connect the flue gas input pipe to the air inlet pipe 14. The flue gas passes through the semi-dry tower 1, the bag filter 2, the first fan 15, the heat exchanger 3, the ejector 4, the fluidized bed trap 5, and the pollutant factor trap 6 in sequence. The semi-dry tower 1 cools the mercury-containing flue gas to a range that the bag filter 2 can withstand. The bag filter collects dust, mercury-containing particulate matter, and elemental mercury in the flue gas. The first fan 15 extracts the flue gas in the first two parts of the pipeline. The heat exchanger controls the temperature of the pipeline flue gas within a suitable range and heats the flue gas passing through the bag filter. The modified activated carbon or polymer material is sprayed into the closed conveying pipe 18 through the ejector 4, forming a mercury-adsorbing smoke in the conveying pipe 18. The modified activated carbon or polymer material in the fluidized bed trap 5 absorbs the mercury-removing powder and the mercury-containing flue gas. The check valve 8 prevents the reverse flow of the flue gas when the pressure of the ejector 4 is insufficient, playing a good protective role. Use the pollutant factor trap 6 to treat pollutants, and finally discharge through the third fan 19. The flow monitor 20 monitors the flow in real time. For this dry thermal desorption tail gas mercury removal device, first heat the pollutants to form mercury-containing flue gas or tail gas, directly remove mercury from the flue gas without oxidizing mercury into an ionic solution, saving resources, reducing costs, not easily generating a large amount of waste, and being beneficial to environmental protection production.

[0020] Finally, it should be noted that the above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or perform equivalent replacements for some of the technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A dry thermal desorption tail gas mercury removal device, comprising a semi-dry tower (1), characterized in that: A bag filter (2) is connected to one side of the semi-dry tower (1), a heat exchanger (3) is provided on the other side of the bag filter (2), a fluidized bed collector (5) is provided on the other side of the heat exchanger (3), two pollution factor collectors (6) are connected to the other side of the fluidized bed collector (5), an ejector (4) is further provided between the heat exchanger (3) and the fluidized bed collector (5), a nozzle (7) is connected to the ejector (4), and a one-way pipe (8) is provided on the nozzle (7).

2. The dry thermal desorption tail gas mercury removal device according to claim 1, characterized in that: An inner plate (9), a baffle (10), a spring (12) and a sealing plate (13) are arranged in the one-way tube (8); the inner plate (9) and the baffle (10) are fixed on the inner wall of the one-way tube (8); a through hole (11) is opened at the center of the baffle (10); a spring (12) is fixed at the center of the upper surface of the inner plate (9); the upper end of the spring (12) passes through the through hole (11) and is connected to the sealing plate (13); and the sealing plate (13) is sealed and attached to the through hole (11).

3. The dry thermal desorption tail gas mercury removal device according to claim 1, characterized in that: A delivery pipe 1 (17) is connected between the semi-dry tower (1) and the heat exchanger (3), and a fan 2 (16) is also connected to the heat exchanger (3). An air inlet pipe (14) is provided on one side of the semi-dry tower (1), and two air outlet ends of the air inlet pipe (14) are respectively connected to the delivery pipe 1 (17) and the fan 2 (16).

4. The dry thermal desorption tail gas mercury removal device according to claim 1, characterized in that: A fan 1 (15) is also connected between the bag filter (2) and the heat exchanger (3).

5. The dry thermal desorption tail gas mercury removal device according to claim 1, characterized in that: The heat exchanger (3) and the fluidized bed collector (5) are connected via a second delivery pipe (18), and the other end of the nozzle (7) is connected to the second delivery pipe (18).

6. The dry thermal desorption tail gas mercury removal device according to claim 1, characterized in that: The exhaust pipe of the pollution factor collector (6) is connected to a third fan (19), and a flow monitor (20) is provided on the exhaust pipe of the third fan (19).

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