Household garbage pyrolysis / incinerator double-alkali deacidification system

Abstract

The utility model discloses a household garbage pyrolysis / incinerator double-alkali deacidification system which comprises a rack, a deacidification tower mounted in the rack, a flue gas deacidification agent premixing channel connected with the top of the deacidification tower, and a spraying mechanism arranged at the upper part of the deacidification tower, the flue gas deacidification agent premixing channel comprises a flue gas conveying channel connected with the top of the deacidification tower and a deacidification agent conveying channel communicated with the low inlet end of the flue gas conveying channel; the spraying mechanism comprises a top water spraying piece and a plurality of side alkali liquor spraying pieces arranged along the upper end of the side part of the deacidification tower. The flue gas deacidification device is reasonable in design, flue gas and a deacidification agent are premixed and then deacidified through communication of the deacidification agent conveying channel and the low inlet end of the flue gas conveying channel, and the deacidified flue gas is discharged from the bottom of the deacidification tower after the flue gas enters the deacidification tower from the top of the deacidification tower, so that the deacidification effect is improved, the problems of bed collapse and blockage of the deacidification tower are solved, and the deacidification effect is improved. And reliable and high-efficiency deacidification is realized.

Description

Technical Field

[0001] The utility model belongs to the technical field of flue gas treatment, in particular to a double-alkali deacidification system for a domestic waste pyrolysis / incineration furnace. Background Art

[0002] The pyrolysis / incineration furnace, namely the pyrolysis furnace and the incineration furnace, not only realizes the harmlessness, reduction and resource utilization of garbage, but also can effectively overcome the pollution problems caused by garbage. Therefore, it has become a garbage treatment technology with good development prospects. However, at present, domestic waste will generate flue gas after being treated by a pyrolysis / incineration furnace, and the generated flue gas contains components that are directly and indirectly harmful to the human body and the environment. Therefore, it is necessary to carry out deacidification treatment on the flue gas to avoid the harm of the flue gas to humans and the environment.

[0003] At present, the circulating fluidized bed method is generally used for flue gas deacidification. However, the flue gas and hydrated lime enter from the inlet of the Venturi tube at the bottom of the deacidification tower. If the negative pressure at the Venturi tube at the inlet of the desulfurization tower changes instantaneously, accidents such as bed collapse and blockage will occur.

[0004] Therefore, at present, a double-alkali deacidification system for a domestic waste pyrolysis / incineration furnace with reasonable design is needed. The low inlet ends of the deacidifying agent delivery channel and the flue gas delivery channel are connected to realize the deacidification after the pre-mixing of the flue gas and the deacidifying agent. Moreover, after the flue gas enters from the top of the deacidification tower, the deacidified flue gas is discharged from the bottom of the deacidification tower, which improves the deacidification effect and solves the problems of bed collapse and blockage of the deacidification tower, realizing reliable and high-efficiency deacidification. Summary of the Utility Model

[0005] The technical problem to be solved by the utility model is to provide a double-alkali deacidification system for a domestic waste pyrolysis / incineration furnace aiming at the deficiencies in the above-mentioned prior art. The system has reasonable design. The low inlet ends of the deacidifying agent delivery channel and the flue gas delivery channel are connected to realize the deacidification after the pre-mixing of the flue gas and the deacidifying agent. Moreover, after the flue gas enters from the top of the deacidification tower, the deacidified flue gas is discharged from the bottom of the deacidification tower, which improves the deacidification effect and solves the problems of bed collapse and blockage of the deacidification tower, realizing reliable and high-efficiency deacidification.

[0006] To solve the above technical problems, the technical solution adopted by the utility model is: a double-alkali deacidification system for a domestic waste pyrolysis / incineration furnace, which is characterized in that it includes a frame, a deacidification tower installed on the frame, a flue gas deacidifying agent pre-mixing channel connected to the top of the deacidification tower, and a spraying mechanism arranged in the upper part of the deacidification tower;

[0007] The flue gas deacidifying agent pre-mixing channel includes a flue gas delivery channel connected to the top of the deacidification tower and a deacidifying agent delivery channel connected to the low inlet end of the flue gas delivery channel;

[0008] The spraying mechanism includes a top water spraying member and a plurality of side alkali liquid spraying members arranged along the upper part of the side of the deacidification tower.

[0009] The above-mentioned double-alkali acid removal system for a domestic waste pyrolysis / incineration furnace is characterized in that: the flue gas conveying channel is arranged along the height direction of the acid removal tower, the high end of the flue gas conveying channel is communicated with the top of the acid removal tower, and the low end of the flue gas conveying channel is arranged lower than the bottom of the acid removal tower;

[0010] The low end of the flue gas conveying channel is the flue gas inlet, and the acid removing agent conveying channel is arranged close to the flue gas inlet.

[0011] The above-mentioned double-alkali acid removal system for a domestic waste pyrolysis / incineration furnace is characterized in that: both the top water spray member and the side alkali liquid spray member are double-fluid atomizing spray guns. The gas inlet of the double-fluid atomizing spray gun is connected to an air compressor through a gas pipeline. The liquid inlet of the double-fluid atomizing spray gun in the side alkali liquid spray member is connected to the acid removal solution tank, and the liquid inlet of the double-fluid atomizing spray gun in the top water spray member is connected to the water tank.

[0012] The above-mentioned double-alkali acid removal system for a domestic waste pyrolysis / incineration furnace is characterized in that: a flue gas outlet channel and an ash and slag collection bin are arranged at the bottom of the acid removal tower. A screw conveyor is arranged at the bottom of the ash and slag collection bin. The conveying pipeline of the screw conveyor is communicated with the low end of the flue gas conveying channel and is located at the rear end of the acid removing agent conveying channel.

[0013] The above-mentioned double-alkali acid removal system for a domestic waste pyrolysis / incineration furnace is characterized in that: an intermediate collection bin is arranged at the bottom of the conveying pipeline. A slide valve and a dome valve are arranged between the bottom of the conveying pipeline and the intermediate collection bin. A three-way valve is arranged at the bottom of the intermediate collection bin.

[0014] The present utility model has the following advantages compared with the prior art:

[0015] 1. The present utility model sets the acid removing agent conveying channel to be communicated with the low inlet end of the flue gas conveying channel, so that the flue gas can be premixed with the acid removing agent when the flue gas is introduced. In this way, during the process that the flue gas and the acid removing agent are premixed and then enter the top of the acid removal tower along the flue gas conveying channel with the flue gas, by utilizing the characteristic that the moisture content of the flue gas is relatively high, a certain amount of acid removal reaction will occur between the flue gas and the acid removing agent before entering the acid removal tower.

[0016] 2. The present utility model sets the top water spray member to immediately and violently mix the flue gas containing the acid removing agent entering the acid removal tower with the ultra-fine water mist sprayed by the top water spray member, improving the mixing reaction of the acidic gas in the flue gas and further improving the acid removal effect; in addition, multiple side alkali liquid spray members are provided, and the opening number or opening and closing operation of the side alkali liquid spray members can be adjusted according to the detection indexes of the flue gas after subsequent treatment, so as to meet the acid removal requirements to the greatest extent.

[0017] In summary, the design of the utility model is reasonable. By connecting the low inlet ends of the deacidifying agent conveying channel and the flue gas conveying channel, premixing of the flue gas and the deacidifying agent is achieved for deacidification. After the flue gas enters from the top of the deacidification tower, the deacidified flue gas is discharged from the bottom of the deacidification tower, improving the deacidification effect and solving the problems of bed collapse and blockage of the deacidification tower, thus realizing reliable and high-efficiency deacidification.

[0018] The technical solution of the utility model will be further described in detail below with reference to the drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the utility model.

[0020] Description of the reference numerals:

[0021] 1 - Flue gas conveying channel; 1-1 - Flue gas inlet; 2 - Deacidification tower;

[0022] 3-1 - Top water spray member; 3-2 - Side alkali solution spray member; 4 - Flue gas outlet channel;

[0023] 5 - Ash collection bin; 6 - Screw conveyor; 7 - Conveying pipeline;

[0024] 8 - Slide gate valve; 9 - Dome valve; 10 - Intermediate collection bin;

[0025] 11 - Three-way valve; 12 - Deacidifying agent conveying channel; 13 - Frame;

[0026] 14 - Air compressor; 15 - Deacidifying solution tank; 16 - Water tank. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] As Figure 1 shown, the utility model includes a frame 13, a deacidification tower 2 installed on the frame 13, a flue gas deacidifying agent premixing channel connected to the top of the deacidification tower 2, and a spraying mechanism arranged on the upper part of the deacidification tower 2;

[0028] The flue gas deacidifying agent premixing channel includes a flue gas conveying channel 1 connected to the top of the deacidification tower 2 and a deacidifying agent conveying channel 12 communicated with the low inlet end of the flue gas conveying channel 1;

[0029] The spraying mechanism includes a top water spray member 3-1 and a plurality of side alkali solution spray members 3-2 arranged along the upper part of the side of the deacidification tower 2.

[0030] In this embodiment, the flue gas conveying channel 1 is arranged along the height direction of the deacidification tower 2. The high end of the flue gas conveying channel 1 is communicated with the top of the deacidification tower 2, and the low end of the flue gas conveying channel 1 is arranged lower than the bottom of the deacidification tower 2;

[0031] The lower end of the flue gas conveying channel 1 is the flue gas inlet 1-1, and the deacidifying agent conveying channel 12 is arranged close to the flue gas inlet 1-1.

[0032] In this embodiment, both the top water spray member 3-1 and the side alkali solution spray member 3-2 are dual-fluid atomizing spray guns. The gas inlet of the dual-fluid atomizing spray gun is connected to an air compressor 14 through a gas pipeline. The liquid inlet of the dual-fluid atomizing spray gun in the side alkali solution spray member 3-2 is connected to a deacidifying solution tank 15, and the liquid inlet of the dual-fluid atomizing spray gun in the top water spray member 3-1 is connected to a water tank 16.

[0033] In this embodiment, a flue gas outlet channel 4 and a slag collection bin 5 are arranged at the bottom of the deacidification tower 2. A screw conveyor 6 is arranged at the bottom of the slag collection bin 5. The conveying pipeline 7 of the screw conveyor 6 is communicated with the lower end of the flue gas conveying channel 1 and is located behind the deacidifying agent conveying channel 12.

[0034] In this embodiment, an intermediate collection bin 10 is arranged at the bottom of the conveying pipeline 7. A slide gate valve 8 and a dome valve 9 are arranged between the bottom of the conveying pipeline 7 and the intermediate collection bin 10. A three-way valve 11 is arranged at the bottom of the intermediate collection bin 10.

[0035] In this embodiment, it should be noted that in actual use, the water tank 16 connected to the top water spray member 3-1 can also be replaced with a deacidifying solution tank 15, or the deacidifying solution tank 15 connected to the side alkali solution spray member 3-2 can be replaced with a water tank 16 to adjust the spraying of water or alkali solution.

[0036] In this embodiment, the deacidifying agent conveyed in the deacidifying agent conveying channel 12 is slaked lime.

[0037] In this embodiment, the alkali solution in the deacidifying solution tank 15 is sodium hydroxide solution.

[0038] In this embodiment, the deacidifying agent conveying channel 12 is arranged close to the flue gas inlet 1-1, so that the deacidifying agent at the outlet of the deacidifying agent conveying channel 12 can be driven by the relatively high flow rate of the flue gas to be pre-mixed with the flue gas and enter the deacidification tower 2.

[0039] In this embodiment, the deacidifying agent conveying channel 12 communicated with the low inlet end of the flue gas conveying channel 1 is provided to pre-mix with the deacidifying agent when the flue gas is introduced. In this way, during the process that the flue gas and the deacidifying agent are pre-mixed and then enter the top of the deacidification tower 2 along with the flue gas through the flue gas conveying channel 1, by using the characteristic of the relatively high moisture content of the flue gas, a certain amount of deacidification reaction will occur between the flue gas and the deacidifying agent before entering the deacidification tower.

[0040] In this embodiment, the top water spray member 3-1 is provided so that the flue gas containing the deacidifying agent entering the deacidification tower can be immediately and vigorously mixed with the ultrafine water mist sprayed by the top water spray member 3-1, improving the mixing reaction of the acidic gases in the flue gas and further enhancing the deacidification effect.

[0041] In addition, a plurality of side alkali liquid spray members 3-2 are provided, and the opening number or the opening and closing operation of the side alkali liquid spray members 3-2 can be adjusted according to the detection indexes of the flue gas after subsequent treatment, so as to meet the deacidification requirements to the greatest extent.

[0042] In this embodiment, the flue gas is set to enter the top of the deacidification tower 2 through the flue gas delivery channel 1, and then discharged from the bottom of the deacidification tower 2 after being deacidified inside the deacidification tower 2. In this way, a certain amount of deacidification reaction can occur in the flue gas delivery channel 1, and deacidification can also be carried out inside the deacidification tower 2, increasing the deacidification path and time, thereby improving the deacidification effect.

[0043] In this embodiment, the ash residue collection bin 5 is provided so that the unreacted slaked lime can fall into the ash residue collection bin 5 under the action of gravity and negative pressure for collection.

[0044] The screw conveyor 6 is provided to convey the unreacted slaked lime collected in the ash residue collection bin 5 to the flue gas delivery channel to participate in the deacidification cycle, and the excess part is diverted into the intermediate collection bin 10 for fly ash transportation.

[0045] In this embodiment, the gate valve 8 and the dome valve 9 are provided to control the connection between the conveying pipeline 7 and the intermediate collection bin 10, so that the excess ash residue in the conveying pipeline 7 can enter the intermediate collection bin 10 through the gate valve 8 and the dome valve 9 for collection.

[0046] The gate valve 8 is provided to facilitate the opening and closing operation, so as to facilitate the subsequent maintenance of the fly ash pipeline such as the dome valve 9.

[0047] When the present utility model is specifically used, slaked lime is introduced through the deacidifying agent delivery channel 12, and flue gas is introduced through the low inlet end of the flue gas delivery channel 1. During the process that the flue gas and the deacidifying agent are premixed and then enter the top of the deacidification tower 2 along with the flue gas through the flue gas delivery channel 1, by utilizing the characteristic that the flue gas has a relatively high moisture content, a certain amount of deacidification reaction will occur between the flue gas and the deacidifying agent before entering the deacidification tower.

[0048] The flue gas containing the deacidifying agent entering the deacidification tower is immediately and vigorously mixed with the ultrafine water mist sprayed by the top water spray member 3-1 and the side alkali liquid spray members 3-2, improving the mixing reaction of the acidic gases in the flue gas and enhancing the deacidification effect.

[0049] The unreacted slaked lime after the deacidification reaction falls into the ash collection bin 5 under the action of gravity and negative pressure. Then, part of the powder is conveyed to the flue gas conveying channel 1 by the screw conveyor 6 to participate in the deacidification cycle. The excess part is shunted through the slide valve 8 and the dome valve 9 and enters the intermediate collection bin 10. Finally, it is collected through the fly ash pipeline connected by the three-way valve 11. The flue gas purified by the deacidification tower 2 is discharged from the bottom of the deacidification tower 2 and enters the subsequent dust removal facilities at the back end.

[0050] In summary, the design of the present utility model is reasonable. By connecting the low inlet ends of the deacidifying agent conveying channel and the flue gas conveying channel, premixing of the flue gas and the deacidifying agent is achieved before deacidification. Moreover, after the flue gas enters from the top of the deacidification tower, the deacidified flue gas is discharged from the bottom of the deacidification tower, improving the deacidification effect and solving the problems of bed collapse and blockage of the deacidification tower, thus realizing reliable and high-efficiency deacidification.

[0051] The above is only a preferred embodiment of the present utility model and does not impose any limitation on the present utility model. Any simple modification, change, and equivalent structural change made to the above embodiments according to the technical essence of the present utility model still fall within the protection scope of the technical solution of the present utility model.

Claims

1. A dual-alkali deacidification system for a domestic waste pyrolysis / incineration furnace, characterized in that: It includes a frame (13), a deacidification tower (2) installed on the frame (13), a flue gas deacidifying agent premixing channel connected to the top of the deacidification tower (2), and a spraying mechanism arranged in the upper part of the deacidification tower (2); The flue gas deacidifying agent premixing channel includes a flue gas conveying channel (1) connected to the top of the deacidification tower (2) and a deacidifying agent conveying channel (12) communicated with the low inlet end of the flue gas conveying channel (1); The spraying mechanism includes a top water spraying member (3-1) and a plurality of side alkali liquor spraying members (3-2) arranged along the upper part of the side of the deacidification tower (2).

2. The dual-alkali acid removal system for a domestic waste pyrolysis / incineration furnace according to claim 1, characterized in that: The flue gas conveying channel (1) is arranged along the height direction of the deacidification tower (2), the high end of the flue gas conveying channel (1) is communicated with the top of the deacidification tower (2), and the low end of the flue gas conveying channel (1) is arranged lower than the bottom of the deacidification tower (2); The low end of the flue gas conveying channel (1) is a flue gas inlet (1-1), and the deacidifying agent conveying channel (12) is arranged close to the flue gas inlet (1-1).

3. A dual-alkali deacidification system for a domestic waste pyrolysis / incineration furnace according to claim 1, characterized in that: Both the top water spraying member (3-1) and the side alkali liquor spraying members (3-2) are two-fluid atomizing spray guns. The gas inlet of the two-fluid atomizing spray gun is connected to an air compressor (14) through a gas pipeline. The liquid inlet of the two-fluid atomizing spray gun in the side alkali liquor spraying member (3-2) is connected to a deacidification solution tank (15), and the liquid inlet of the two-fluid atomizing spray gun in the top water spraying member (3-1) is connected to a water tank (16).

4. A dual-alkali deacidification system for a domestic waste pyrolysis / incineration furnace according to claim 1, characterized in that: A flue gas outlet channel (4) and an ash and slag collection bin (5) are arranged at the bottom of the deacidification tower (2). A screw conveyor (6) is arranged at the bottom of the ash and slag collection bin (5). The conveying pipeline (7) of the screw conveyor (6) is communicated with the low end of the flue gas conveying channel (1) and is located at the rear end of the deacidifying agent conveying channel (12).

5. A dual-alkali deacidification system for a domestic waste pyrolysis / incineration furnace according to claim 4, characterized in that: An intermediate collection bin (10) is arranged at the bottom of the conveying pipeline (7). A slide valve (8) and a dome valve (9) are arranged between the bottom of the conveying pipeline (7) and the intermediate collection bin (10). A three-way valve (11) is arranged at the bottom of the intermediate collection bin (10).

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