Desulfurizing agent spraying device for dry desulfurization

Abstract

The utility model relates to the technical field of dry desulfurization, in particular to a desulfurizing agent spraying device for dry desulfurization, which comprises a spraying device body and a flue, the spraying device body comprises a valve, a pneumatic conveying pipeline, a pneumatic conveying circular ring and a spraying hole, and the valve is arranged at a feed port of the pneumatic conveying pipeline. The pneumatic conveying pipeline penetrates through the side wall of the flue and extends into the flue, the pneumatic conveying circular ring is arranged in the flue and connected with the pneumatic conveying pipeline, the spraying holes are formed in the pneumatic conveying circular ring, at least two stages of spraying device bodies are arranged, each stage of spraying device body is distributed in the flue at equal intervals, and a plurality of spraying holes are formed in the pneumatic conveying circular ring. The annular holes are distributed on the surface of the pneumatic conveying ring in an annular array; by arranging the multiple stages of spraying devices in the flue and uniformly distributing the spraying holes in each stage of spraying device, the contact area between a desulfurizing agent and flue gas is greatly increased, and the technical problems of low desulfurization efficiency and high operation cost caused by difficult uniform distribution of the desulfurizing agent in the flue in the prior art are solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to dry desulfurization technical field, concretely to a kind of multistage porous injection device for dry desulfurization process. BACKGROUND

[0002] In prior art, the conventional process of dry desulfurization is to use powder feeder to transport desulfurizer powder to the front of desulfurization tower by air force, and then use injection device to spray desulfurizer into flue, and mix with SO2 and other acid gases in flue gas to react. At present, most of the desulfurizer injection devices directly spray through one or more pipes, and the spray port on the pipe is usually set to one. This kind of straight pipe spray port makes it difficult for desulfurizer to be evenly dispersed inside the flue, resulting in uneven mixing of flue gas and desulfurizer. In the long-term operation process, the desulfurizer will also block the spray pipe, resulting in reduced desulfurization efficiency and increased consumption of desulfurizer and desulfurization by-products, which increases the operating cost.

[0003] In prior art, the invention with publication number CN118179204A discloses a kind of dry desulfurization equipment and dry desulfurization process, including exhaust pipe, material bin for storing desulfurizer, injector arranged in exhaust pipe and fan for transporting desulfurizer to injector. The injector is arranged at the upper end of the exhaust pipe, and the discharge port of the injector is inclined towards the gas inlet direction of the exhaust pipe. The lower end of the exhaust pipe is provided with a cleaning hole, which is arranged along the length direction of the exhaust pipe. A removable cleaning cover is connected to the outer wall of the exhaust pipe to close the cleaning hole. The cleaning cover is convexly arranged towards the direction away from the exhaust pipe, and the inner cavity of the cleaning cover is in communication with the cleaning hole. The above technical solution only has a single injector, which can easily cause uneven mixing of flue gas and desulfurizer. In addition, the desulfurizer can also block the spray pipe, which ultimately leads to reduced desulfurization efficiency and increased operating cost. UTILITY MODEL CONTENT

[0004] To solve the technical problems of low desulfurization efficiency and high operating cost in dry desulfurization in prior art, the utility model provides a desulfurizer injection device for dry desulfurization.

[0005] The desulfurizer injection device for dry desulfurization includes an injection device body, a flue, a valve, a pneumatic conveying pipe, a pneumatic conveying ring, and a spray hole. The valve is arranged at the inlet of the pneumatic conveying pipe. The pneumatic conveying pipe extends into the flue and is connected to the pneumatic conveying ring arranged inside the flue. The spray hole is arranged on the pneumatic conveying ring. The injection device body has at least two stages, and the spray hole is arranged in multiple and distributed in a ring array on the surface of the pneumatic conveying ring.

[0006] In the desulfurizer injection device for dry desulfurization, the injection device body further comprises an inspection pipeline connected with the injection device body, wherein the inspection pipeline passes through the sidewall of the flue from outside and is connected to the pneumatic conveying ring.

[0007] In the desulfurizer injection device for dry desulfurization, a blind plate flange is detachably arranged at the interface of the inspection pipeline to block the inspection pipeline.

[0008] In the desulfurizer injection device for dry desulfurization, the injection hole penetrates through the pneumatic conveying ring, and the opening direction of the injection hole is parallel to the flow direction of the flue gas in the flue.

[0009] In the desulfurizer injection device for dry desulfurization, the opening diameter of the injection hole is preferably 1 / 4-1 / 2 of the pipe diameter of the pneumatic conveying ring.

[0010] In the desulfurizer injection device for dry desulfurization, the number of stages of the injection device body is preferably 3-6 stages.

[0011] In the desulfurizer injection device for dry desulfurization, the outer diameter of the pneumatic conveying ring of each stage of the injection device increases or decreases step by step along the flow direction of the flue gas in the flue.

[0012] In the desulfurizer injection device for dry desulfurization, the distance between adjacent injection device bodies is preferably 100-1000 mm.

[0013] In the desulfurizer injection device for dry desulfurization, the pipe diameter of the pneumatic conveying pipeline is the same as the pipe diameter of the pneumatic conveying ring.

[0014] The beneficial effects of the desulfurizer injection device for dry desulfurization include: by arranging multiple stages of injection devices in the flue and uniformly distributing injection holes on each stage of the injection device, the contact area of the desulfurizer and the flue gas is greatly increased, and the technical problems of low desulfurization efficiency and high operation cost caused by the difficulty of uniform distribution of the desulfurizer in the flue in the prior art are solved. BRIEF DESCRIPTION OF DRAWINGS

[0015] Fig. 1 It is a front view of the desulfurizer injection device for dry desulfurization.

[0016] Fig. 2 It is a front view of the flue of the desulfurizer injection device for dry desulfurization.

[0017] Fig. 3 It is a side view of the flue of the desulfurizer injection device for dry desulfurization.

[0018] Marked as: 1 - injection device body, 11 - valve, 12 - pneumatic conveying pipeline, 13 - pneumatic conveying ring, 14 - injection hole, 15 - manhole, 2 - flue. DETAILED DESCRIPTION

[0019] The utility model is explained below in combination with the drawings.

[0020] As Figs. 1-3 shown, the desulfurizer injection device for dry desulfurization of the utility model, including injection device body 1, flue 2, injection device body 1 includes valve 11, pneumatic conveying pipeline 12, pneumatic conveying ring 13, injection hole 14, valve 11 is set at the feed inlet of pneumatic conveying pipeline 12, pneumatic conveying pipeline 12 is inserted into flue 2 and is connected with the pneumatic conveying ring 13 arranged in the inside of flue 2, injection hole 14 is arranged on pneumatic conveying ring 13, wherein injection device body 1 is provided with at least two stages, and the specific number of stages and the interval of injection device body 1 are determined by the size of flue 2, when the cross section of flue 2 is rectangular, the maximum outer diameter of pneumatic conveying ring 13 is set to be less than the short side of the rectangular cross section, when the cross section of flue 2 is circular, the maximum outer diameter of pneumatic conveying ring 13 is less than the diameter of the circular cross section, injection hole 14 is arranged as a plurality of and is annularly arranged on the surface of pneumatic conveying ring 12, to ensure that the desulfurizer can be evenly distributed in flue 2, so as to be in full contact with the flue gas.

[0021] Further, the injection device body 1 further includes a maintenance pipeline 15 connected with the injection device body 1, the maintenance pipeline 15 is connected to the pneumatic conveying ring 13 from the flue 2 outside through the flue 2 side wall, when the injection device is blocked, the valve 11 of the corresponding injection device body 1 can be closed, the corresponding maintenance pipeline 15 is connected, and the blocked desulfurizer is cleaned through the maintenance pipeline 15, so that the maintenance can be realized without stopping.

[0022] Further, the interface of the maintenance pipeline 15 is detachably provided with a blind flange, which is used to block the maintenance pipeline 15 when maintenance is not needed.

[0023] Further, the injection hole 14 is arranged through the pneumatic conveying ring 13, and the opening direction of the injection hole 14 is parallel to the flow direction of the flue gas in the flue 2, so that the flue gas can pass through the injection hole 14, and the desulfurizer and the flue gas are prevented from accumulating at the injection hole 14 after reaction, causing blockage.

[0024] Further, the opening diameter of the injection hole 14 is preferably 1 / 4-1 / 2 of the pipe diameter of the pneumatic conveying ring 13, and the injection of the desulfurizer through the injection hole 14 of this size is more gentle and controllable.

[0025] Further, in the embodiment, the number of stages of the injection device body 1 is preferably 3-6 stages, and the injection device of this number of stages has a high desulfurization efficiency while taking cost into consideration.

[0026] Further, the outer diameter of the pneumatic conveying ring 13 of each stage of the injection device 1 is increased or decreased step by step along the direction of the flue gas flow in the flue 2, thereby increasing the injection range of the pneumatic conveying ring 13, so that the desulfurizer can cover the entire flue cross section, and the mixing uniformity of the flue gas and the desulfurizer is improved.

[0027] Further, in the embodiment, the spacing between adjacent injection device bodies 1 is preferably 100-1000 mm, and the injection device of the embodiment has a high desulfurization efficiency at this spacing.

[0028] Further, the pipe diameter of the pneumatic conveying pipe 12 is the same as the pipe diameter of the pneumatic conveying ring 13, which ensures smooth transportation of the desulfurizer in the injection device body 1.

[0029] In the embodiment, a coal gas boiler flue gas SDS sodium carbonate dry desulfurization project of a certain steel plant is taken as an example. The cross section of the flue 2 at the outlet of the air preheater of the boiler of the project is 3600 mm*3400 mm. In the embodiment, three-stage injection device bodies 1 are arranged in the flue 2. The arrangement is that the outer diameters of the desulfurizer pneumatic conveying rings 13 of the injection device bodies 1 are arranged from large to small along the direction of the flue gas flow. The spacing between each stage of the injection device bodies 1 is 500 mm. The outer diameters of the pneumatic conveying rings 13 of each stage of the injection device bodies 1 are 3000 mm, 2000 mm, and 1000 mm, respectively. The pipe diameters of the pneumatic conveying rings 13 of each stage of the injection device bodies 1 are 108 mm, 89 mm, and 76 mm, respectively. Blind flange sealing is adopted for the outer interface of the maintenance pipe 15 of each stage of the injection device bodies 1. The injection holes 14 are uniformly arranged on the surface of the pneumatic conveying ring 13. The opening direction of the injection holes 14 is the same as the direction of the flue gas flow in the flue 2. The number of the injection holes 14 on each stage of the injection device bodies 1 is 20, 16, and 12, respectively. The hole diameters of the injection holes 14 on each stage of the injection device bodies 1 are 40 mm, 32 mm, and 24 mm, respectively. The above structure makes the injection holes 14 basically cover the entire cross section of the flue 2, and the desulfurizer sprayed from the injection holes 14 can cover the entire flue 2, thereby improving the mixing uniformity of the flue gas and the desulfurizer and improving the desulfurization efficiency. When a fault occurs, the valve 11 is closed, the blind flange of the maintenance pipe 15 corresponding to the injection device body 1 that is blocked is opened, and the blocked desulfurizer is cleaned through the maintenance pipe 15. During this process, the remaining injection device bodies 1 can operate normally. After the maintenance is completed, the blind flange is closed, and the valve 11 is opened, thereby realizing online maintenance without shutdown.

[0030] Compared with the prior art, the desulfurizer injection device for dry desulfurization has the following advantages: by arranging multiple-stage injection devices in the flue along the flow direction of the flue gas, and uniformly distributing injection holes on each injection device, the desulfurizer is more fully contacted with the flue gas in the flue, the desulfurization efficiency is improved, and the consumption of the desulfurizer is saved; by arranging a maintenance pipeline on the injection device, when the injection device is blocked, other injection devices can maintain normal operation, and the faulty injection device is maintained alone, so that non-stop maintenance is realized, the operation cost is reduced, and the technical problems of low desulfurization efficiency and high operation cost caused by the difficulty of uniformly distributing the desulfurizer in the flue in the prior art are solved.

Claims

1. A desulfurizer injection device for dry desulfurization, comprising an injection device body (1), a flue (2), the injection device body (1) comprising a valve (11), a pneumatic conveying pipe (12), a pneumatic conveying ring (13), and an injection hole (14), the valve (11) being arranged at the feeding port of the pneumatic conveying pipe (12), the pneumatic conveying pipe (12) extending into the flue (2) and being connected with the pneumatic conveying ring (13) arranged inside the flue (2), and the injection hole (14) being arranged on the pneumatic conveying ring (13), characterized in that: The injection device body (1) is provided with at least two stages, the injection holes (14) are provided in plurality and are arranged in annular array on the surface of the pneumatic conveying ring (13). ​ 2. The desulfurizer injection device for dry desulfurization according to claim 1, characterized by: The injection device body (1) further comprises an inspection pipeline (15) connected with the injection device body (1), the inspection pipeline (15) is connected to the pneumatic conveying ring (13) from the flue (2) outside through the side wall of the flue (2).

3. The desulfurizer injection device for dry desulfurization according to claim 2, characterized by: The interface of the inspection pipeline (15) is detachably provided with a blind plate flange for plugging the inspection pipeline (15).

4. The desulfurizer injection device for dry desulfurization according to claim 1, characterized by: The injection holes (14) are arranged through the pneumatic conveying ring (13), and the opening direction of the injection holes (14) is parallel to the flow direction of the flue gas in the flue (2).

5. The desulfurizer injection device for dry desulfurization according to claim 4, characterized by: The opening diameter of the injection holes (14) is 1 / 4-1 / 2 of the pipe diameter of the pneumatic conveying ring (13).

6. The desulfurizer injection device for dry desulfurization according to claim 1, characterized by: The stage number of the injection device body (1) is 3-6.

7. The desulfurizer injection device for dry desulfurization according to claim 1, characterized by: The outer diameter of the pneumatic conveying ring (13) of each stage of the injection device body (1) is gradually increased or decreased along the flow direction of the flue gas in the flue (2).

8. The desulfurizer injection device for dry desulfurization according to claim 1, characterized by: The spacing between adjacent injection device bodies (1) is 100-1000 mm.

9. The desulfurizing agent injection device for dry desulfurization according to claim 1, characterized by: The pipe diameter of the pneumatic conveying pipeline (12) is the same as the pipe diameter of the pneumatic conveying ring (13).

Images