Sludge incineration flue gas harmless treatment device

Abstract

The utility model relates to a kind of harmless treatment device of sludge incineration flue gas, including double-cavity neutralization reduction tank and bag-type dust collector, double-cavity neutralization reduction tank is annular structure and is divided into neutralization cavity and reduction cavity, initial flue gas enters neutralization cavity by neutralization cavity flue gas input, carries out neutralization by lye spraying row, waste liquid is converged into waste liquid collection bin by arc collecting port, flue gas after neutralization enters bag-type dust collector by flue gas after neutralization output through the flue gas transmission pipe filled with powder activated carbon, bag-type dust collector captures particulate matter and adsorbed heavy metal, flue gas after adsorption and dust removal enters the reduction cavity flue gas input of reduction cavity by flue gas transmission pipe through flue gas after adsorption and dust removal output, nitrogen oxides are reduced in reduction cavity filled with ammonia water or urea using SNCR technology, and finally output to incinerator intake end by reduction flue gas output port. The device realizes the segmented combination processing of acidic gas, neutralization, particulate matter and adsorptive pollutants and nitrogen oxides.

Description

Technical Field

[0001] This utility model relates to the field of flue gas treatment technology, specifically a device for harmless treatment of flue gas from sludge incineration. Background Technology

[0002] The flue gas produced during sludge incineration contains a large number of harmful substances. Therefore, it needs to be safely treated before being released. The flue gas typically contains acidic gases, particulate matter (adsorbed heavy metals / dioxins), and nitrogen oxides. Existing harmless treatment facilities often use separate equipment or devices to treat each type of harmful substance, which can lead to large land requirements, insufficient utilization of the equipment, resource waste, and increased treatment costs.

[0003] To address this, this technical solution designs a device for the harmless treatment of sludge incineration flue gas. Utility Model Content

[0004] The purpose of this invention is to provide a device for the harmless treatment of sludge incineration flue gas, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: A sludge incineration flue gas harmless treatment device includes a dual-chamber neutralization and reduction tank and a bag filter. The dual-chamber neutralization and reduction tank and the bag filter are longitudinally distributed, with the bag filter positioned above the dual-chamber neutralization and reduction tank. The dual-chamber neutralization and reduction tank is configured as a ring structure, internally divided into two chambers: a reduction chamber and a neutralization chamber. The neutralization chamber is used to neutralize the initial flue gas and remove acidic gases from it. The reduction chamber is filled with a reducing liquid for reducing the flue gas to be incinerated, removing nitrogen oxides. Simultaneously, the inlet of the bag filter is connected to the outlet of the neutralization chamber, meaning that acidic gases in the flue gas are removed beforehand. The flue gas is then fed into the bag filter for particulate matter and heavy metal adsorption treatment. After being treated by the bag filter, the flue gas is reintroduced into the reduction chamber for further reduction treatment, and finally fed into the incinerator for final complete combustion before being discharged. The neutralization chamber has a neutralization chamber flue gas inlet on one side and a neutralized flue gas outlet on the top of the other side. The neutralization chamber flue gas inlet is used for the initial flue gas input, and the neutralized flue gas outlet is used to input the flue gas after removing acidic gases into the bag filter. The neutralized flue gas outlet is connected to the air inlet of the bag filter through a flue gas transmission pipe. Specifically, multiple sets of alkaline spray rows are arranged at equal intervals along the arc on the upper side of the neutralization chamber. The top of the alkaline spray rows are connected to an alkaline liquid chamber located at the top of the neutralization chamber. The top of the alkaline liquid chamber is equipped with a liquid feeding port for inputting alkaline liquid. At the same time, each alkaline spray row is equipped with a water pump to control the alkaline liquid to spray downwards along the alkaline spray row to neutralize the flue gas passing through. Each set of alkaline spray nozzles has an arc-shaped collection port at the bottom of the neutralization chamber directly below it. The bottom of the arc-shaped collection port is connected to a waste liquid collection chamber, and the two ports are in a connected state. The width of the arc-shaped collection port is greater than the coverage area of ​​the liquid sprayed by the alkaline spray nozzles, which ensures that the falling waste liquid can be fully concentrated and flow into the waste liquid collection chamber for collection.

[0006] In this embodiment of the utility model, a flue gas outlet after adsorption and dust removal is provided on one side of the top of the bag filter. The flue gas outlet after adsorption and dust removal is used to output the flue gas treated in the bag filter. The outside of the flue gas outlet after adsorption and dust removal is connected to the air inlet of the reduction chamber through a flue gas transmission pipe. The air inlet of the reduction chamber is provided with a flue gas inlet for the reduction chamber. The flue gas inlet for the reduction chamber is connected to the flue gas transmission pipe. A flue gas outlet after reduction is provided on the top of the other side of the reduction chamber. The flue gas outlet after reduction is used to output the reduced flue gas. The flue gas outlet after reduction is connected to the air inlet of the incinerator. The inside of the reduction chamber is filled with ammonia or urea. The input flue gas is immersed in ammonia or urea. Using SNCR (selective non-catalytic reduction) technology, nitrogen oxides are reduced to harmless nitrogen gas. Then the flue gas is output through the flue gas outlet after reduction. Simultaneously, before the neutralized flue gas enters the bag filter, it is filled with oil-based powdered activated carbon in the flue gas transmission pipe. The activated carbon efficiently adsorbs heavy metals such as mercury and dioxins in the gas phase. These "toxic" activated carbon particles are then captured by the bag filter. Compared with the prior art, the beneficial effects of this utility model are: by orderly connecting the neutralization chamber, neutralization spray outlet, bag filter and reduction chamber, acidic gases, particulate matter / heavy metals and nitrogen oxides are treated respectively, reducing the footprint of individual independent equipment and the waste of reusing resources, improving the utilization rate of the device and reducing the treatment cost. Attached Figure Description

[0007] Figure 1 This is a schematic diagram of a device for the harmless treatment of flue gas from sludge incineration.

[0008] Figure 2 This is a three-dimensional structural diagram of a dual-chamber neutralization and reduction tank in a sludge incineration flue gas harmless treatment device.

[0009] Figure 3 This is a top view of the internal structure of a dual-chamber neutralization and reduction tank in a sludge incineration flue gas harmless treatment device.

[0010] The system includes: a dual-chamber neutralization and reduction tank 10, a bag filter 11, a neutralization chamber flue gas inlet 12, a neutralized flue gas outlet 13, a reduction chamber flue gas inlet 14, a reduction flue gas outlet 15, a liquid feed inlet 16, a reduction chamber 17, a neutralization chamber 18, an alkaline spray outlet 19, a waste liquid collection bin 20, an arc-shaped collection port 21, a pump body 22, a flue gas transmission pipe 23, a control valve 24, and an adsorption and dust removal flue gas outlet 25. Detailed Implementation

[0011] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments of the present invention can be combined with each other.

[0012] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0013] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0014] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0015] Please see Figures 1-3A sludge incineration flue gas harmless treatment device includes a dual-chamber neutralization and reduction tank 10 and a bag filter 11. The dual-chamber neutralization and reduction tank 10 and the bag filter 11 are longitudinally distributed, with the bag filter 11 positioned above the dual-chamber neutralization and reduction tank 10. The dual-chamber neutralization and reduction tank 10 is configured with a ring structure, internally divided into two chambers: a reduction chamber 17 and a neutralization chamber 18. The neutralization chamber 18 is used to neutralize the initial flue gas and remove acidic gases from it. The reduction chamber 17 contains... The chamber is filled with reducing liquid, which is used to treat the flue gas to be incinerated in a reduction reaction to remove nitrogen oxides from the flue gas. At the same time, the inlet end of the bag filter 11 is connected to the outlet end of the neutralization chamber 18, that is, the acidic gas in the flue gas is removed in advance. Then, the flue gas is fed into the bag filter 11 for particulate matter and heavy metal adsorption treatment. The flue gas treated inside the bag filter 11 is then fed into the reduction chamber 17 for reduction treatment. Finally, it is fed into the incinerator for final complete combustion before being discharged. The neutralization chamber 18 has a neutralization chamber flue gas inlet 12 on one side and a neutralized flue gas outlet 13 on the top of the other side. The neutralization chamber flue gas inlet 12 is used for the input of initial flue gas, and the neutralized flue gas outlet 13 is used to input the flue gas after removing acidic gases into the bag filter 11. The neutralized flue gas outlet 13 is connected to the air inlet of the bag filter 11 through the flue gas transmission pipe 23. Specifically, multiple sets of alkaline spray rows 19 are arranged at equal intervals along the arc on the upper side of the neutralization chamber 18. The top of the alkaline spray rows 19 are connected to an alkaline liquid chamber located at the top of the neutralization chamber 18. A liquid feed port 16 is provided at the top of the alkaline liquid chamber for inputting alkaline liquid. At the same time, a water pump is provided at each alkaline spray row 19 to control the alkaline liquid to spray downward along the alkaline spray row 19 to neutralize the flue gas passing through. Each set of alkaline spray nozzles 19 has an arc-shaped collection port 21 at the bottom of the corresponding neutralization chamber 18. The bottom of the arc-shaped collection port 21 is connected to the waste liquid collection chamber 20. The two adjacent ports are in a connected state. The width of the arc-shaped collection port 21 is greater than the coverage area of ​​the liquid sprayed by the alkaline spray nozzles 19, which ensures that the falling waste liquid can be fully concentrated and flow into the waste liquid collection chamber 20 for collection. Among them, alkaline liquids are generally solutions such as sodium hydroxide and potassium hydroxide.

[0016] In this embodiment of the utility model, a flue gas outlet 25 after adsorption and dust removal is provided on one side of the top of the bag filter 11. The flue gas outlet 25 after adsorption and dust removal is used to output the flue gas treated in the bag filter 11. The outside of the flue gas outlet 25 after adsorption and dust removal is connected to the air inlet of the reduction chamber 17 through the flue gas transmission pipe 23. The air inlet of the reduction chamber 17 is provided with a reduction chamber flue gas inlet 14. The reduction chamber flue gas inlet 14 is connected to the flue gas transmission pipe 23. A reduced flue gas outlet 15 is provided on the top of the other side of the reduction chamber 17. The reduced flue gas outlet 15 is used to output the reduced flue gas. The reduced flue gas outlet 15 is connected to the air inlet of the incinerator. The reduction chamber 17 is filled with ammonia or urea. The input flue gas is immersed in ammonia or urea. Using SNCR (selective non-catalytic reduction) technology, nitrogen oxides are reduced to harmless nitrogen gas. Then the flue gas is output through the reduced flue gas outlet 15. Meanwhile, before the neutralized flue gas is fed into the bag filter 11, it is filled with oil-powdered activated carbon in the flue gas transmission pipe 23. The activated carbon will efficiently adsorb heavy metals such as mercury and dioxins in the gas phase, and then these "toxic" activated carbon particles will be captured by the bag filter. Preferably, a liquid feed port 16 is also provided on one side of the top of the reduction chamber 17 for the input of alkaline liquid; the flue gas transmission pipe 23 is provided with a pump body 22, a control valve 24 and other structures for controlling the transmission of flue gas.

[0017] In one embodiment of this utility model, the process and principle of the bag filter 11 for treating flue gas are as follows: After neutralization, the flue gas is at a moderate temperature and has been mixed with powdered activated carbon for adsorbing pollutants. Through the filter bags, the flue gas is guided into a box containing a large number of fabric or felt filter bags. The flue gas enters the interior through the tiny pores of the filter material from the outside of the filter bags. The particulate matter in the flue gas (including fly ash, reaction products such as CaCl2, CaSO4, etc.) is directly blocked on the outer surface of the filter bags. At the same time, the pre-sprayed powdered activated carbon (and the heavy metals and dioxins adsorbed on its surface) is also efficiently trapped outside the filter bags. Clean flue gas passing through the filter bags is collected from the top and discharged through the flue gas outlet 25 after adsorption and dust removal. When the dust layer captured on the outer surface of the filter bags reaches a certain thickness, the system will shake off the dust (called "dust cake") through pulse jet cleaning and other methods, so that it falls into the lower ash hopper and is transported away periodically.

[0018] It should be noted that since the bag filter 11 is already a fairly mature existing technology, it will not be described in detail here.

[0019] The working principle of this utility model is as follows: In the idle position of this device, all the aforementioned driving components (representing power elements, electrical devices, and compatible power supplies) are connected via wires. The electrical connections are completed in sequence between the working components. The detailed connection methods are well-known in the field. The following mainly describes the working principle and process, without further explanation of the electrical control. Alkaline liquid is added to the alkaline liquid tank at the top of the neutralization chamber 18 through the liquid feed port 16, and the water pumps at each alkaline spray nozzle 19 are started to spray the alkaline liquid downwards along the alkaline spray nozzle 19. The initial flue gas enters the neutralization chamber 18 through the flue gas inlet 12 of the neutralization chamber and comes into contact with the alkaline spray to carry out a neutralization reaction. The acidic gas is neutralized, and the generated waste liquid flows into the waste liquid collection tank 20 along the arc-shaped collection port 21 and is treated or recycled downstream. The neutralized flue gas enters the flue gas transmission pipe 23 through the neutralized flue gas outlet 13. During operation, powdered activated carbon is filled into the flue gas transmission pipe 23 to fully mix the activated carbon with the flue gas and adsorb pollutants such as gaseous mercury and dioxins. The flue gas and the toxic activated carbon are transported to the bag filter 11 under the control of the pump body 22 and the control valve 24. Inside the bag filter 11, flue gas passes through the filter bags, and particulate matter and pollutants adsorbed by activated carbon are trapped on the outer surface of the filter bags. Clean flue gas is discharged from the flue gas outlet 25 after adsorption and dust removal. The dust cake on the outer surface of the filter bags is periodically cleaned into the lower ash hopper and transported away by pulse jet cleaning or other methods. The flue gas discharged from the flue gas outlet 25 after adsorption and dust removal enters the flue gas inlet 14 of the reduction chamber 17 through the flue gas transmission pipe 23. The flue gas is immersed in the ammonia or urea filling the reduction chamber 17 and the nitrogen oxides in the flue gas are reduced to nitrogen gas by selective non-catalytic reduction (SNCR). The reduced flue gas is output from the reduced flue gas outlet 15 and connected to the incinerator inlet for final combustion and emission.

[0020] It should be understood that in this application, all rotating, sliding, meshing, belt-driven and other moving parts are well lubricated and not prone to slippage or wear, and each part is provided with a corresponding protective shell. However, in the accompanying drawings of this application, the connection state of each moving part is not shown. It should also be understood that all parts in this application are made of metal or plastic materials with suitable strength in the relevant field to ensure that their structural rigidity meets the actual requirements.

[0021] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A device for harmless treatment of sludge incineration flue gas, characterized in that, The system includes a dual-chamber neutralization and reduction tank (10) and a bag filter (11). The dual-chamber neutralization and reduction tank (10) has an annular structure and is internally divided into a reduction chamber (17) and a neutralization chamber (18). The neutralization chamber (18) has a neutralization chamber flue gas inlet (12) on one side and a neutralized flue gas outlet (13) on the top of the other side. Multiple sets of alkaline spray nozzles (19) are arranged at equal intervals along an arc on the upper side of the neutralization chamber (18). (19) The top is connected to an alkaline liquid chamber located at the top of the neutralization chamber (18). A liquid feeding port (16) is provided at the top of the alkaline liquid chamber, and a water pump is provided at each alkaline spray row (19). An arc-shaped collection port (21) is provided at the bottom of the neutralization chamber (18) directly below each group of alkaline spray rows (19). The bottom of the arc-shaped collection port (21) is connected to a waste liquid collection chamber (20), and adjacent arc-shaped collection ports (21) are connected. The neutralized flue gas outlet (13) is connected to the air inlet of the bag filter (11) through the flue gas transmission pipe (23). The bag filter (11) has a flue gas outlet (25) after adsorption and dust removal on one side of the top. The flue gas outlet (25) after adsorption and dust removal is connected to the flue gas inlet (14) of the reduction chamber (17) through the flue gas transmission pipe (23). The reduction chamber (17) is filled with reducing liquid and has a reduced flue gas outlet (15). The flue gas transmission pipe (23) is filled with powdered activated carbon between the bag filter (11) and the neutralization chamber (18). The flue gas transmission pipe (23) is equipped with a pump body (22) and a control valve (24). The reduced flue gas outlet (15) is connected to the inlet of the incinerator.

2. The sludge incineration flue gas harmless treatment device according to claim 1, characterized in that, The bag filter (11) and the dual-chamber neutralization and reduction tank (10) are longitudinally distributed, with the bag filter (11) positioned above the dual-chamber neutralization and reduction tank (10).

3. The sludge incineration flue gas harmless treatment device according to claim 2, characterized in that, The alkaline spray nozzles (19) are arranged at equal intervals along an arc on the upper side inside the neutralization chamber (18), and the spray liquid of the alkaline spray nozzles (19) is input from the alkaline liquid tank through the liquid feed port (16). The water pumps installed at each alkaline spray nozzle (19) are used to control the alkaline liquid to spray downward along the alkaline spray nozzles (19) to neutralize the flue gas passing through.

4. The sludge incineration flue gas harmless treatment device according to claim 3, characterized in that, The width of the arc-shaped collection port (21) is greater than the coverage area of ​​the liquid sprayed by the alkaline spray nozzle (19), and adjacent arc-shaped collection ports (21) are connected.

5. The sludge incineration flue gas harmless treatment device according to claim 4, characterized in that, The reduction chamber (17) is filled with ammonia or urea.

6. The sludge incineration flue gas harmless treatment device according to claim 5, characterized in that, The flue gas transmission pipe (23) is filled with powdered activated carbon before the neutralized flue gas is delivered to the bag filter (11).

7. The sludge incineration flue gas harmless treatment device according to claim 6, characterized in that, The flue gas transmission pipe (23) is equipped with a pump body (22) and a control valve (24), and a liquid feeding port (16) is also provided on one side of the top of the reduction chamber (17).

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