Boiler flue cleaning device

Abstract

The utility model discloses a boiler flue cleaning device. Comprising a nozzle which is arranged in a boiler flue, is connected with a sand blasting pipe and is used for spraying sand into the boiler flue; the telescopic unit is arranged on the boiler flue and comprises a driving unit and a movable unit in transmission connection with the driving unit; and the baffle unit is connected with the inner end of the movable unit, is arranged in the boiler flue, and is used for blocking the sand sprayed by the spray head so as to change the motion trail of the sand. The surface of the heat exchanger is scoured through high-speed sand, accumulated dust is removed, the heat exchange effect of the heat exchanger is guaranteed, and corrosion of the accumulated dust is delayed; the telescopic unit is used for driving the baffle unit to change the motion trail of the sand, and therefore the cleaning effect is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of boiler flue, in particular to a boiler flue cleaning device. Background Art

[0002] When the boiler burns industrial waste, due to the high content of alkali metal elements such as sodium and potassium in the ash and the low ash melting point, it is easy to form ash accumulation with strong adhesion on the heating surface at the rear of the boiler, reducing the thermal efficiency of the boiler and affecting the long-term operation of the boiler. Although the shock wave soot blowing method is currently widely used on the heating surface at the rear of the boiler, the soot blowing effect is not very significant. Generally, the boiler will be forced to shut down due to the soot problem on the heating surface after 2 to 3 months of operation. After the shutdown, the soot removal on the heating surface is carried out manually, which is labor-intensive and costly. Utility Model Content

[0003] The utility model aims at the deficiencies in the prior art and provides a boiler flue cleaning device, which sprays 1-2 mm corundum on the upper part of the economizer and uses high-speed sand to flush the surface of the heat exchanger to remove accumulated dust, thereby ensuring the heat exchange effect of the heat exchanger and delaying the corrosion of accumulated dust.

[0004] In order to solve the above technical problems, the utility model is solved by the following technical solutions:

[0005] Boiler flue cleaning device, including

[0006] A nozzle, which is arranged in the boiler flue and connected to the sandblasting pipe, is used to spray sand into the boiler flue;

[0007] A retractable unit is arranged on the boiler flue, comprising a driving unit and a movable unit drivingly connected to the driving unit; and

[0008] The baffle unit is connected to the inner end of the movable unit and arranged in the boiler flue, and is used to block the sand material sprayed by the nozzle to change the movement trajectory of the sand material.

[0009] In the above solution, preferably, the nozzle is a conical nozzle.

[0010] In the above solution, preferably, the retractable unit is a hydraulic push rod or an electric push rod.

[0011] In the above solution, preferably, the movable unit is a rod-shaped component, which is controlled by the driving unit to make lateral movement.

[0012] In the above scheme, preferably, the retractable unit is penetrated through the hole of the boiler flue, and a sealing filler is arranged between the boiler flue and the inner wall of the hole.

[0013] In the above solution, preferably, the abrasive material is corundum or quartz sand.

[0014] In the above solution, preferably, the side wall of the baffle unit facing the nozzle is a flat surface or a curved surface.

[0015] In the above scheme, preferably, the sandblasting pipe is connected to an ash hopper, and the ash hopper is arranged below the boiler flue and connected to the boiler flue, and is used to receive the sand material sprayed from the nozzle;

[0016] The ash hopper is provided with a silo pump connected with the sandblasting pipe.

[0017] The beneficial effects of the utility model are:

[0018] The utility model utilizes high-speed sand to flush the surface of the heat exchanger, removes dust accumulation, ensures the heat exchange effect of the heat exchanger and delays the corrosion of dust accumulation; utilizes the telescopic unit to drive the baffle unit to change the movement trajectory of the sand, thereby improving the cleaning effect. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0020] Figure 2 This is a schematic diagram of the layout of the sandblasting tube of the utility model.

[0021] Figure 3 It is a schematic diagram of the ash hopper arrangement of the utility model. DETAILED DESCRIPTION

[0022] The present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods:

[0023] See also Figure 1 Figure 3 The boiler flue cleaning device includes several ash hoppers 1. Several sets of electromagnetic vibration devices can be installed on the ash hoppers 1. For example, two sets are installed. The ash hoppers 1 are provided with manual feeding ports and discharging ports to facilitate initial loading and discharging after operation.

[0024] The lower part of the ash hopper 1 is equipped with a square and round joint, a manual inspection gate valve, a high-temperature resistant expansion joint, a feed valve (swing valve), and a silo pump. Each ash hopper is equipped with a conveying system.

[0025] Each set of silo pumps is equipped with one set of air inlet valve, one set of discharge valve and one set of exhaust valve, for a total of three sets. The silo pumps deliver alternately, and each silo pump corresponds to one ash conveying pipeline and is configured with one injection area.

[0026] In this embodiment, a gas storage tank and a pressure transmitter are configured, and the gas source is determined by the owner based on the gas consumption of the entire plant or a dedicated air compressor system is added.

[0027] Each silo pump is arranged at about -2.000 meters and conveys horizontally for about 2 meters. It is conveyed by seamless steel pipes with specifications of φ114x7. It is conveyed upward to 12 meters through a 90° elbow. Each conveying pipe 2 is divided into three DN100 branches 3. Switch valves are set at the three branches 3. Each DN100 branch 3 is further divided into three DN65 second branches 4 at the end, and sprayed into the boiler flue 5 together. The spacing between the second branches 4 is temporarily set at 300mm. Figure 2 shown.

[0028] The sand material is sprayed into the flue from the second branch pipe 4 via the nozzle 6 arranged in the boiler flue 5. As one of the options, the nozzle 6 is a conical nozzle. The sand material is sprayed out from the nozzle 6 with a spray angle and is diffuse. It is difficult to effectively spray the sand material to various parts of the flue by relying solely on the nozzle, and it is difficult to effectively clean the flue heating surface (heat exchanger). For this reason, the present embodiment is also designed with a corresponding retractable unit and a baffle unit 7. As one of the options, the sand material is corundum or quartz sand.

[0029] Since the tail flue is too close to the cyclone separator, consider arranging the delivery pipe and switching valve on this surface. The telescopic unit is arranged between the tail flue and the electrostatic precipitator. The telescopic unit is a hydraulic push rod or an electric push rod, which can correspond to the number of branch pipes, such as setting nine sets.

[0030] In this embodiment, the retractable unit includes a driving unit 81 and a movable unit 82 transmission-connected to the driving unit 81 . The movable unit 82 is a rod-shaped component that passes through the hole of the boiler flue 5 and is controlled by the driving unit 81 to make lateral movements.

[0031] The baffle unit 7 is arranged in the boiler flue 5 and installed at the inner end of the movable unit 82. The baffle unit 7 moves laterally with the lateral movement of the movable unit 82. It is on the spray path of the sand. Depending on its lateral position, the movement trajectory of the sand after rebounding is also different. Therefore, by changing the position of the baffle unit 7, the impact position of the sand can cover the entire required cleaning area.

[0032] In this embodiment, a sealing filler is arranged between the boiler flue 5 and the inner wall of the hole to fill the hole, and the sealing filler is frictionally movable with the movable unit.

[0033] In this embodiment, the side wall of the baffle unit 7 facing the nozzle is a flat surface or a curved surface.

[0034] The sandblasting pipe (transport pipe, branch pipe, second branch pipe) is connected to the ash hopper, which is arranged below the boiler flue and connected to the boiler flue to receive the sand sprayed from the nozzle so that the sand can be recovered and then sent to the nozzle again after recovery.

[0035] A boiler flue cleaning method comprises the following steps:

[0036] S1. Start the silo pump to drive the sand material to be sprayed into the boiler flue through the nozzle;

[0037] S2. Start the retractable unit to drive the baffle unit to move horizontally, and the sand material is sprayed on the baffle unit, and the movement trajectory of the sand material is changed by the baffle unit, so as to clean the boiler flue by the impact of the sand material;

[0038] S3. Turn off the retractable unit and the silo pump.

[0039] Furthermore, in step S2, the retractable unit performs a lateral reciprocating motion.

[0040] In order to provide data support and practical basis for this technical solution, field tests were conducted on the transportation of slag and corundum. The test simulated the actual transportation conditions, using a 0.5 cubic meter silo pump from the No. 3 furnace, arranging a set of DN80 conveying pipelines, with a climbing height of about 18 meters, arranging 3 elbows, and transporting boiler slag (particle size less than 5mm) and corundum (2-5mm). The test results show that both slag and corundum can be transported by pneumatic conveying, using DN80 for transportation, and the final conveying speed reached about 125m / s, and the actual material-gas ratio was between 6 and 8.

[0041] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. Boiler flue cleaning device, characterized in that: include A spray head is arranged in the boiler flue and connected to the sandblasting pipe, and is used to spray sand into the boiler flue; A retractable unit is arranged on the boiler flue and includes a driving unit and a movable unit drivingly connected to the driving unit; as well as The baffle unit is connected to the inner end of the movable unit and arranged in the boiler flue, and is used to block the sand material sprayed by the nozzle to change the movement trajectory of the sand material.

2. The boiler flue cleaning device according to claim 1, characterized in that: The nozzle is a conical nozzle.

3. The boiler flue cleaning device according to claim 1, characterized in that: The retractable unit is a hydraulic push rod or an electric push rod.

4. The boiler flue cleaning device according to claim 1, characterized in that: The movable unit is a rod-shaped component, which is controlled by the driving unit to move laterally.

5. The boiler flue cleaning device according to any one of claims 1 to 4, characterized in that: The telescopic unit is arranged through the hole of the boiler flue, and a sealing filler is arranged between the boiler flue and the inner wall of the hole.

6. The boiler flue cleaning device according to claim 1, characterized in that: The sand material is corundum or quartz sand.

7. The boiler flue cleaning device according to claim 1, characterized in that: The side wall of the baffle unit facing the nozzle is a flat surface or a curved surface.

8. The boiler flue cleaning device according to claim 1, characterized in that: The sandblasting pipe is communicated with an ash hopper, which is arranged below the boiler flue and communicated with the boiler flue for receiving sand material sprayed from the nozzle.

9. The boiler flue cleaning device according to claim 8, characterized in that: The ash hopper is provided with a silo pump connected with the sandblasting pipe.

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