Boiler wet scrubbing tower

Abstract

This utility model relates to a wet scrubbing tower for boilers, which employs several layers of packing partitions arranged above the interior of the wet scrubbing tower; a liquid distribution pipe of a cooling circulating liquid device is connected above the packing partitions at the top of the wet scrubbing tower; a first quench spray pipe structure of the cooling circulating liquid device is connected below the packing partitions; and a second quench spray pipe structure of the quench spray device is connected in the middle of the wet scrubbing tower. The first and second quench spray pipe structures quench the boiler flue gas entering from below the wet scrubbing tower, so that the cooling circulating liquid device can more quickly remove pollutants, mainly SO2, from the boiler flue gas entering the packing partitions, thus preventing partial short-circuiting of the flue gas and ensuring that SO2 does not exceed the standard even when there are drastic fluctuations in the boiler outlet pollutant (SO2).

Description

Technical Field

[0001] The embodiments of this utility model relate to a scrubbing tower, and more particularly to a boiler wet scrubbing tower in a flue gas purification system employing SNCR + semi-dry method + dry method + bag filter + SCR + induced draft fan + wet scrubbing tower + GGH flue gas treatment process. Background Technology

[0002] Existing wet scrubbing towers typically employ a plate tower design, consisting of a liquid distributor, three layers of perforated trays, four quenching spray guns at the inlet, and a top layer. High-temperature flue gas from the dust collector enters the scrubbing tower after being cooled by a gas cooling generator (GGH). Four sets of nozzles are arranged at the top of the flue gas inlet to quench the gas. The flue gas passes through three layers of trays from bottom to top, contacting the circulating liquid to remove pollutants. A liquid distributor at the top of the sieve plates pressurizes and evenly distributes the circulating liquid from the bottom pool onto the trays using a circulating pump. A demister is installed at the top of the tower to intercept mist-like droplets carried in the flue gas, preventing them from entering the downstream flue gas system.

[0003] However, in existing semi-dry desulfurization processes used in the pre-treatment stage of boiler flue gas purification, a large amount of slurry is added. The vast majority of acidic pollutants in the flue gas are removed through a combination of semi-dry, dry, and baghouse dust collector processes, limiting the effectiveness of wet scrubbing towers. Due to uneven water spraying in the wet scrubbing tower distributor, a uniform water film cannot be formed locally at the tower plate openings, leading to partial short-circuiting of flue gas. In actual operation, when there are drastic fluctuations in boiler outlet pollutants, SO2 may temporarily exceed the standard. When high-sulfur waste is co-fired with the boiler feed, CEMS at the chimney outlet may detect short-term continuous SO2 exceedances, even reaching as high as 800 mg / Nm³. 3 The peak values ​​are around 100° and 200°. Utility Model Content

[0004] The purpose of this utility model is to provide a boiler wet scrubbing tower that can solve the technical problems of uneven water spraying in the wet scrubbing tower distributor, inability to form a uniform water film at the opening of the tower plate, partial short circuit of flue gas, and short-term SO2 exceeding the standard when the pollutant (SO2) at the boiler outlet flues drastically.

[0005] To achieve the above objectives, the present invention provides a boiler wet scrubbing tower, comprising:

[0006] Wet scrubbing tower;

[0007] A packing partition device, wherein several layers of the packing partition device are arranged above the interior of the wet scrubbing tower;

[0008] A cooling circulating fluid device is connected to the liquid distribution pipe in the cooling circulating fluid device at the top of the wet scrubbing tower, above the packing partition device; and to the first quench spray pipe structure in the cooling circulating fluid device below the packing partition device.

[0009] A quench spray device is located in the middle of the wet scrubbing tower, and a second quench spray pipe structure is connected to the quench spray device. The first quench spray pipe structure and the second quench spray pipe structure quench the boiler flue gas entering from below the wet scrubbing tower, so that the cooling circulating liquid device can remove pollutants from the boiler flue gas entering the packing partition device more quickly.

[0010] Furthermore, in the boiler wet scrubbing tower described in this utility model, a flat plate demister is fixed at the upper part of the wet scrubbing tower.

[0011] A boiler flue gas inlet pipe is connected to the lower part of the wet scrubbing tower;

[0012] The outlet of the cooling circulating liquid device and the outlet of the quench spray device are respectively connected to the bottom of the wet scrubbing tower.

[0013] Furthermore, in the boiler wet scrubbing tower described in this utility model, several outlets of the cooling circulating liquid device and the outlet of the quench spray device are respectively provided on the side of the wet scrubbing tower.

[0014] Furthermore, in the boiler wet scrubbing tower described in this utility model, the packing partition device further includes:

[0015] Support beams, several of which are fixed along the circumferential direction on the wet scrubbing tower;

[0016] A porous grid is fixed to the support beam above the support beam using PP cable ties;

[0017] The filler is used to fill the upper part of the porous grid.

[0018] Furthermore, in the boiler wet scrubbing tower of this utility model, several packing materials are filled in the upper part of the porous grid, with 3 layers of packing materials in each location and each layer of packing materials being 200mm high.

[0019] Furthermore, in the boiler wet scrubbing tower described in this utility model, the cooling circulating liquid device further includes:

[0020] A coolant circulation pump is provided, with the outlet of the coolant circulation device in the wet scrubbing tower connected to the inlet of the coolant circulation pump.

[0021] The heat exchanger is connected to the outlet of the coolant circulation pump, and the outlet of the heat exchanger is connected to the liquid distribution pipe and the first quench spray pipe structure.

[0022] Furthermore, in the boiler wet scrubbing tower described in this utility model, the liquid distribution pipe further includes:

[0023] A fixing frame is fixedly connected to the cylinder of the wet scrubbing tower;

[0024] The main pipe is fixed on the central axis of the fixed frame; the outlet of the heat exchanger is connected to the main pipe;

[0025] Branch pipes are symmetrically fixed on both sides of the main pipe; the length of the branch pipes is set along the circumferential edge from the main pipe to the cylinder body.

[0026] A spiral solid cone nozzle is fixed on any one of the branch pipes, and the spiral solid cone nozzles spray coolant evenly onto the packing.

[0027] Furthermore, in the boiler wet scrubbing tower described in this utility model, the first quench spray pipe structure also includes...

[0028] The outlet of the heat exchanger is also connected to the main pipe;

[0029] Branch pipes are fixedly connected to the main pipe at 0°, 90°, 180°, and 270° positions along the cylinder of the wet scrubbing tower. A spray gun is fixedly connected to any one of the branch pipes, and a spiral solid conical nozzle is flanged onto any one of the spray guns.

[0030] Furthermore, in the boiler wet scrubbing tower described in this utility model, the quench spray device further includes:

[0031] A quench spray pump is connected to the inlet of the quench spray pump at the outlet of the cooling circulating liquid device of the wet scrubbing tower.

[0032] The outlet of the quench spray pump is connected to the second quench spray pipeline structure.

[0033] Furthermore, in the boiler wet scrubbing tower described in this utility model, the structure of the second quench spray pipe is the same as that of the first quench spray pipe.

[0034] Compared with the prior art, the embodiment of this utility model adopts a method of setting several layers of packing partition devices inside the wet scrubbing tower; at the top of the wet scrubbing tower, above the packing partition devices, a liquid distribution pipe of the cooling circulating liquid device is connected; below the packing partition devices, a first quench spray pipe structure of the cooling circulating liquid device is connected; and in the middle of the wet scrubbing tower, a second quench spray pipe structure of the quench spray device is connected. The first and second quench spray pipe structures quench the boiler flue gas entering from below the wet scrubbing tower, so that the cooling circulating liquid device can more quickly remove pollutants, mainly SO2, from the boiler flue gas entering the packing partition devices. This achieves uniform water spraying from the wet scrubbing tower distributor, forming a uniform water film locally at the tower plate openings, preventing partial flue gas short circuits, and even when the boiler outlet pollutant (SO2) flues drastically, SO2 is effectively controlled. 2也 This system eliminates short-term exceedances of standards and resolves issues such as uneven water spraying in wet scrubbing tower distributors, incomplete water film formation at tower plate openings, and partial flue gas short-circuiting. It also addresses situations where drastic fluctuations in boiler outlet pollutants can cause short-term SO2 exceedances. Furthermore, when waste with high sulfur content is co-fired with the boiler feed, CEMS at the chimney outlet can detect short-term, continuous SO2 exceedances, sometimes reaching as high as 800 mg / Nm³. 3 Technical issues related to the left and right peak values. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the structure of this utility model;

[0036] Figure 2 This is an enlarged schematic diagram of the packing spacer device of this utility model;

[0037] Figure 3 This is a schematic diagram of the liquid distribution tube of this utility model. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of this utility model clearer, the various embodiments of this utility model will be described in detail below with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details have been provided in the various embodiments of this utility model to facilitate a better understanding of this application. However, the technical solutions claimed in the claims of this application can be implemented even without these technical details and with various variations and modifications based on the following embodiments.

[0039] The embodiments of this utility model relate to a wet scrubbing tower for boilers, such as... Figures 1-3 As shown, it includes:

[0040] In this embodiment, the wet scrubbing tower 1 rapidly cools the flue gas. The flue gas passes through three layers of tower plates from bottom to top and comes into contact with the circulating liquid to remove pollutants, mainly SO2.

[0041] Several layers of packing partition devices 10 are installed inside the wet scrubbing tower 1. The packing partition devices 10 mainly serve to form a liquid film on the tower plate with the circulating liquid and contact it with the flue gas rising through the opening, thereby increasing the contact area.

[0042] At the top of the wet scrubbing tower 1, above the packing partition device 10, the liquid distribution pipe 30 in the cooling circulating liquid device 20 is connected; below the packing partition device 10, the first quench spray pipe structure 40 in the cooling circulating liquid device 20 is connected; the cooling circulating liquid device 20 is mainly used for the circulation of cooling circulating liquid, which is used to circulate and cool the flue gas.

[0043] In the middle of the wet scrubbing tower 1, a second quench spray pipe structure 60 is connected to the quench spray device 50. The first quench spray pipe structure 40 and the second quench spray pipe structure 60 quench the boiler flue gas entering from below the wet scrubbing tower 1, so that the cooling circulating liquid device 20 can more quickly remove pollutants, mainly SO2, from the boiler flue gas entering the packing partition device 10. The quench spray device 50 is mainly used for rapid cooling of the flue gas.

[0044] The wet scrubbing tower for boilers in this embodiment achieves uniform water spraying from the distributor, forming a uniform water film locally at the openings in the tower plates, preventing partial short-circuiting of flue gas, and ensuring that even when there are drastic fluctuations in SO2 at the boiler outlet, SO2 levels remain relatively stable. 2也 This system eliminates short-term exceedances of standards and resolves issues such as uneven water spraying in wet scrubbing tower distributors, incomplete water film formation at tower plate openings, and partial flue gas short-circuiting. It also addresses situations where drastic fluctuations in boiler outlet pollutants can cause short-term SO2 exceedances. Furthermore, when waste with high sulfur content is co-fired with the boiler feed, CEMS at the chimney outlet can detect short-term, continuous SO2 exceedances, sometimes reaching as high as 800 mg / Nm³. 3 Technical issues related to the left and right peak values.

[0045] To achieve the aforementioned technical effects, the boiler wet scrubbing tower in this embodiment, such as... Figures 1-3 As shown, a flat plate demister 2 is fixed at the top of the wet scrubbing tower 1; the main function of the flat plate demister 2 is to reduce dust in the flue gas.

[0046] A boiler flue gas inlet pipe 3 is connected to the lower part of the wet scrubbing tower 1; the flue gas inlet pipe 3 is used to introduce flue gas. Then the flue gas flows from bottom to top inside the wet scrubbing tower 1.

[0047] The outlet of the cooling circulating liquid device 20 and the outlet of the quench spray device 50 are connected to the bottom of the wet scrubbing tower 1, respectively.

[0048] To achieve the aforementioned technical effects, the boiler wet scrubbing tower in this embodiment, such as... Figures 1-3 As shown, several outlets of cooling circulating liquid devices 20 and outlets of quench spray devices 50 are respectively provided on the side of the wet scrubbing tower 1.

[0049] To achieve the aforementioned technical effects, the boiler wet scrubbing tower in this embodiment, such as... Figures 1-3 As shown, the packing spacer device 10 further includes:

[0050] Several support beams 11 are fixed along the circumferential direction on the wet scrubbing tower 1; the support beams 11 are used to support the porous grid 12.

[0051] The porous grid 12 is secured to the support beam 11 with PP cable ties 13 above the support beam 11; filler 14 is then placed on the upper part of the porous grid 12.

[0052] To achieve the aforementioned technical effects, the boiler wet scrubbing tower in this embodiment, such as... Figures 1-3 As shown, several fillers 14 are filled in the upper part of the porous grid 12, with 3 layers of fillers 14 in each location, and each layer of fillers 14 is 200mm high.

[0053] To achieve the aforementioned technical effects, the boiler wet scrubbing tower in this embodiment, such as... Figures 1-3 As shown, the cooling fluid circulation device 20 also includes:

[0054] The outlet of the cooling liquid circulation device 20 in the wet scrubbing tower 1 is connected to the inlet of the cooling liquid circulation pump 21; the cooling liquid circulation pump 21 is used to transport the cooling liquid.

[0055] The inlet of heat exchanger 22 is connected to the outlet of coolant circulation pump 21. The outlet of heat exchanger 22 is connected to liquid distribution pipe 30 and first quench spray pipe structure 40, respectively. Heat exchanger 22 is mainly used to exchange heat with coolant to achieve the function of cooling coolant.

[0056] To achieve the aforementioned technical effects, the boiler wet scrubbing tower in this embodiment, such as... Figures 1-3 As shown, the liquid distribution pipe 30 also includes:

[0057] A fixing frame 31 is fixedly connected to the cylinder of the wet scrubbing tower 1; the fixing frame 31 is used to fix the main pipe 32 and the branch pipe 33.

[0058] The main pipe 32 is fixed on the central axis of the mounting bracket 31; the outlet of the heat exchanger 22 is connected to the main pipe 32;

[0059] Branch pipes 33 are symmetrically fixed on both sides of the main pipe 32; the length of the branch pipe 33 is set along the circumferential edge of the main pipe 32 to the cylinder; the main pipe 32 connects to the branch pipe 33 to play a diverging role.

[0060] A spiral solid cone nozzle 34 is fixed on any branch pipe 33. The spiral solid cone nozzle 34 sprays coolant evenly onto the packing 14.

[0061] To achieve the aforementioned technical effects, the boiler wet scrubbing tower in this embodiment, such as... Figures 1-3 As shown, the first quench spray pipe structure 40 also includes

[0062] The outlet of heat exchanger 22 is also connected to the main pipe 41; the main pipe 41 and the branch pipe 42 form a divergent structure.

[0063] Branch pipes 42 are fixedly connected to the main pipe 41 at 0°, 90°, 180° and 270° positions along the cylinder of the wet scrubbing tower 1. A spray gun 43 is fixedly connected to any one of the branch pipes 42, and a spiral solid conical nozzle 34 is flanged to any one of the spray guns 43.

[0064] To achieve the aforementioned technical effects, the boiler wet scrubbing tower in this embodiment, such as... Figures 1-3 As shown, the rapid cooling spray device 50 also includes:

[0065] The outlet of the cooling circulating liquid device 20 in the wet scrubbing tower 1 is connected to the inlet of the quench spray pump 51; the quench spray pump 51 is used to transport the cooling liquid.

[0066] The outlet of the quench spray pump 51 is connected to the second quench spray pipe structure 60.

[0067] To achieve the aforementioned technical effects, the boiler wet scrubbing tower in this embodiment, such as... Figures 1-3 As shown, the second quench spray pipe structure 60 has the same structure as the first quench spray pipe structure 40. The second quench spray pipe structure 60 and the first quench spray pipe structure 40 are respectively installed above and below the packing partition device 10.

[0068] Those skilled in the art will understand that the above embodiments are specific examples of implementing the present invention, and in practical applications, various changes can be made to them in form and detail without departing from the spirit and scope of the present invention.

Claims

1. A boiler wet scrubbing tower characterized by, include: Wet scrubbing tower; A packing partition device, wherein several layers of the packing partition device are arranged above the interior of the wet scrubbing tower; A cooling circulating fluid device is connected to the liquid distribution pipe in the cooling circulating fluid device at the top of the wet scrubbing tower, above the packing partition device; and to the first quench spray pipe structure in the cooling circulating fluid device below the packing partition device. A quench spray device is located in the middle of the wet scrubbing tower, and a second quench spray pipe structure is connected to the quench spray device. The first quench spray pipe structure and the second quench spray pipe structure quench the boiler flue gas entering from below the wet scrubbing tower, so that the cooling circulating liquid device can remove pollutants from the boiler flue gas entering the packing partition device more quickly.

2. A boiler wet scrubbing tower according to claim 1, characterised in that A flat-plate demister is fixed to the upper part of the wet scrubbing tower; A boiler flue gas inlet pipe is connected to the lower part of the wet scrubbing tower; The outlet of the cooling circulating liquid device and the outlet of the quench spray device are respectively connected to the bottom of the wet scrubbing tower.

3. A boiler wet scrubbing tower according to claim 2, characterised in that Several outlets of the cooling circulating liquid device and the quench spray device are respectively provided on the side of the wet scrubbing tower.

4. The boiler wet scrubbing tower according to claim 1, characterized in that, The packing spacer device further includes: Support beams, several of which are fixed along the circumferential direction on the wet scrubbing tower; A porous grid is fixed to the support beam above the support beam using PP cable ties; The filler is used to fill the upper part of the porous grid.

5. A boiler wet scrubbing tower according to claim 4, characterised in that Several filler materials are installed at the top of the porous grid, with three layers of filler materials at each location, and each layer of filler materials is 200 mm high.

6. The boiler wet scrubbing tower of claim 1, wherein, The cooling fluid circulation device further includes: A coolant circulation pump is provided, with the outlet of the coolant circulation device in the wet scrubbing tower connected to the inlet of the coolant circulation pump. The heat exchanger is connected to the outlet of the coolant circulation pump, and the outlet of the heat exchanger is connected to the liquid distribution pipe and the first quench spray pipe structure.

7. The boiler wet scrubbing tower according to claim 6, characterized in that, The liquid distribution tube further includes: A fixing frame is fixedly connected to the cylinder of the wet scrubbing tower; The main pipe is fixed on the central axis of the fixed frame; the outlet of the heat exchanger is connected to the main pipe; Branch pipes are symmetrically fixed on both sides of the main pipe; the length of the branch pipes is set along the circumferential edge from the main pipe to the cylinder body. A spiral solid cone nozzle is fixed on any one of the branch pipes, and the spiral solid cone nozzles spray coolant evenly onto the packing.

8. The boiler wet scrubbing tower according to claim 6, characterized in that, The first quench spray pipe structure also includes The outlet of the heat exchanger is also connected to the main pipe; Branch pipes are fixedly connected to the main pipe at 0°, 90°, 180°, and 270° positions along the cylinder of the wet scrubbing tower. A spray gun is fixedly connected to any one of the branch pipes, and a spiral solid conical nozzle is flanged onto any one of the spray guns.

9. The boiler wet scrubbing tower according to claim 1, characterized in that, The rapid cooling spray device also includes: A quench spray pump is connected to the inlet of the quench spray pump at the outlet of the cooling circulating liquid device of the wet scrubbing tower. The outlet of the quench spray pump is connected to the second quench spray pipeline structure.

10. The boiler wet scrubbing tower according to claim 9, characterized in that, The second quenching spray pipe structure is the same as the first quenching spray pipe structure.

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