Online ash removal device for flue gas heat exchanger

Abstract

The utility model relates to an on-line ash cleaning device for a flue gas heat exchanger, which is characterized in that an air inlet smoke box and an air outlet smoke box are correspondingly arranged on the left side and the right side of the flue gas heat exchanger, the lower end of the air inlet smoke box is connected with a ton bag for containing ash, and a blowing device capable of sliding left and right is arranged in the air outlet smoke box. A blowing opening is formed in the front end of the blowing device, the rear end of the blowing device is connected with an air chamber used for introducing compressed air into the blowing device, the air chamber is connected with a pneumatic mechanism, and the pneumatic mechanism drives the blowing device to slide left and right. The ash removal device can be used for removing smoke dust in each row of tubes on line in different areas, so that the procedure of manually detaching cleaning hole bolts is omitted, and the labor intensity of personnel is greatly reduced. Cigarette ash is regularly collected into a ton bag, and forking transportation, storage and environment-friendly disposal are facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of equipment dust cleaning, in particular to an online dust cleaning device for a flue gas heat exchanger. Background Art

[0002] Usually, the flue gas temperature at the outlet of the waste sulfuric acid incinerator reaches 1100℃. The flue gas heat exchanger installed after the incineration equipment makes good use of the waste heat of the flue gas to produce steam, and the air heat exchanger in the post-system uses the flue gas to increase the air temperature and send it to the incinerator. However, the large amount of impurities and dust in the flue gas causes the flue gas heat exchanger and the heat exchange equipment heat exchange tubes to be blocked, causing the equipment to operate abnormally, affecting the heat exchange or even stopping.

[0003] The flue gas heat exchanger is usually cleaned by stopping the machine for cleaning, and the machine is stopped for cleaning at regular intervals. This operation results in frequent shutdowns, about once a month; and the dust and acid sludge on the inner wall of the heat exchange tube has a strong adhesion ability. If the cleaning time is extended, it will not only be difficult to clean, but also damage the heat exchange tubes during the cleaning process. Utility Model Content

[0004] In order to solve the above problems, the utility model provides an online dust cleaning device for flue gas heat exchanger, which can realize step-by-step purge of heat exchange tubes, which is convenient and quick. The technical solution adopted by the utility model is as follows:

[0005] An online ash cleaning device for a flue gas heat exchanger is disclosed. An air inlet box and an air outlet box are correspondingly arranged on the left and right sides of the flue gas heat exchanger. A ton bag for holding ash is connected to the lower end of the air inlet box. A blower that can slide left and right is installed in the air outlet box. The front end of the blower is a blow port, and the rear end is connected to an air chamber for introducing compressed air into the blower. The air chamber is connected to a pneumatic mechanism, and the pneumatic mechanism drives the blower to slide left and right.

[0006] The above-mentioned flue gas heat exchanger online dust cleaning device, the purge device includes a plurality of fan-shaped purge units, and the plurality of the purge units are connected in a ring-shaped arrangement; each purge unit includes a plurality of purge rods, and the front end of each of the purge rods is a conical tip, and a plurality of air holes are provided on the tip.

[0007] The above-mentioned flue gas heat exchanger online dust cleaning device, the pneumatic mechanism includes a cylinder and a slideway, and the cylinder is used to push and pull the purge device to move along the slideway.

[0008] The lower end of the above-mentioned air inlet smoke box is connected to the ton bag through the lower ash pipe, and the lower ash pipe is sequentially provided with an air hammer, a pneumatic gate valve I and a pneumatic gate valve II, and the ton bag is placed on a weighing device.

[0009] The beneficial effects of the utility model are as follows: the blower of the dust cleaning device can clean the dust in each tube in different areas online, eliminating the need for manual disassembly and cleaning of bolt holes, greatly saving labor intensity. The dust is regularly collected into ton bags, which is convenient for forklift storage and environmentally friendly disposal. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic diagram of the structure of an embodiment of the utility model;

[0011] Figure 2 This is a schematic diagram of the side structure of the purge device according to an embodiment of the utility model;

[0012] Figure 3 This is a schematic diagram of the purge rod structure of an embodiment of the utility model.

[0013] In the figure: 1- flue gas heat exchanger, 2- purge device, 3- cylinder, 4- air chamber, 5- purge rod, 6- air inlet box, 7- ash lower pipe, 8- air hammer, 9- pneumatic gate valve I, 10- pneumatic gate valve II, 11- ton bag, 12- weighing device, 13- slideway, 14- support, 15- limit ring. DETAILED DESCRIPTION

[0014] The technical solution of the utility model is described in detail below in conjunction with the accompanying drawings. It should be emphasized that the following embodiments are exemplary, and all technical and scientific terms used therein have the same meanings as those commonly understood by ordinary technicians in the technical field to which the utility model belongs.

[0015] This embodiment is an online dust cleaning device for a flue gas heat exchanger. An air inlet box 6 is installed on the left side of the flue gas heat exchanger 1 , through which the flue gas enters and is discharged from an air outlet box on the right side of the flue gas heat exchanger 1 .

[0016] A ton bag 11 is connected to the lower side of the air inlet smoke box 6 through the ash lowering pipe 7. An air hammer 8, a pneumatic gate valve Ⅰ9 and a pneumatic gate valve Ⅱ 10 are provided on the ash lowering pipe 7 in sequence. The ton bag 11 is placed on a weighing device 12 (a commercially available product) to measure the amount of ash falling in real time. When the set amount is reached, the ton bag 11 is removed and the ash is poured out.

[0017] A purge device 2 is installed on the right side of the flue gas heat exchanger 1 on the outlet smoke box. The purge device 2 includes six groups of purge units with fan-shaped cross sections, and the six groups of purge units are arranged in a ring. The purge unit includes a plurality of purge rods 5. The front end of the purge rod 5 extends into the heat exchange tube by about 200 mm. The purge rod 5 is a thick-walled tube and its outer diameter is about 2 mm smaller than the inner diameter of the heat exchange tube of the flue gas heat exchanger 1. The right side of the purge rod 5 is welded to the side plate of the air chamber.

[0018] like Figure 3 As shown, the front end of the purge rod 5 is a conical pointed structure, and a number of air holes are evenly distributed at the pointed end. Figure 1 As shown, the rear end of the purge rod 5 is connected to a disc-shaped air chamber 4 for introducing compressed air. The outer end surface of the air chamber 4 is connected to a cylinder 3, which is mounted on a support 14. The expansion and contraction of the cylinder 3 drives the purge device 2 to move and expand. The purge device 2 is equipped with a limit ring 15 for limiting the expansion and contraction distance of the purge rod 5.

[0019] A solenoid valve (not shown in the figure) is provided between each purge rod 5 and the air chamber 4 to control the on-off and realize the zoned ventilation and purge.

[0020] The operation process of the cleaning device is as follows: the purge 2 is running, and the purge 2 moves left and right under the action of the cylinder 3. The control system allows compressed air to be passed into a part of the purge rods 5 to achieve step-by-step purge. The pointed structure at the front end of the purge rod 5 allows the compressed air to be dispersed and blown out in different directions, covering a larger range. The purge rod 5 blows the soot on the heat exchange tube into the air intake box 6. The pneumatic gate valve I9 ​​is ​​opened synchronously, and the air hammers 8 on both sides knock 10 times (within 1 minute), then the pneumatic gate valve I9 ​​is ​​closed, and the pneumatic gate valve II10 is opened. The air hammer 8 knocks 10 times, and the soot enters the ton bag 11. The weighing device 12 records the weight, and the DCS panel displays it synchronously (the DCS control method and control structure design are both conventional technical means). When the weighing device 12 shows no change, the pneumatic gate valve II10 is closed. This is repeated. When the program is executed and the weighing device 12 shows that the deviation is 0, the program execution is stopped, and a cleaning operation is completed. In this embodiment, it is assumed that when the weighing device 12 displays 800 kg, the purging and cleaning procedure stops and continues after a new ton bag 11 is replaced.

Claims

1. An online dust cleaning device for a flue gas heat exchanger, characterized in that: An air inlet smoke box (6) and an air outlet smoke box are provided on the left and right sides of the flue gas heat exchanger (1), respectively. A blower (2) which can slide left and right is installed in the air outlet smoke box. The front end of the blower (2) is a blow port, and the rear end is connected to an air chamber (4) for introducing compressed air into the blower (2). The air chamber (4) is connected to a pneumatic mechanism, and the pneumatic mechanism drives the blower (2) to slide left and right.

2. The flue gas heat exchanger online dust cleaning device according to claim 1 is characterized in that: The purge device (2) comprises a plurality of fan-shaped purge units, which are connected in a ring-shaped arrangement; each purge unit comprises a plurality of purge rods (5).

3. The on-line dust cleaning device for flue gas heat exchanger according to claim 2 is characterized in that: The front end of each purge rod (5) is a conical tip, and a plurality of air holes are provided on the tip.

4. The on-line dust cleaning device for flue gas heat exchanger according to claim 1 is characterized in that: The pneumatic mechanism comprises a cylinder (3) and a slideway (13), wherein the cylinder (3) is used to push and pull the purge device (2) to move along the slideway (13).

5. The on-line dust cleaning device for flue gas heat exchanger according to claim 1 is characterized in that: The lower end of the smoke inlet box is connected to a ton bag (11) for containing smoke ash.

6. The on-line dust cleaning device for flue gas heat exchanger according to claim 5 is characterized in that: The lower end of the air inlet smoke box (6) is connected to the ton bag (11) via the lower ash pipe (7). The lower ash pipe (7) is provided with an air hammer (8), a pneumatic gate valve I (9) and a pneumatic gate valve II (10) in sequence. The ton bag (11) is placed on a weighing device (12).

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