Low-temperature coal economizer of coal-fired boiler

Abstract

The utility model relates to the technical field of economizers, in particular to a coal-fired boiler low-temperature economizer which comprises a heat insulation shell, a plurality of S-shaped coil pipes are fixedly connected in the heat insulation shell, a water inlet pipe and a water outlet pipe are fixedly connected to the outer wall of the heat insulation shell, and the two ends of each S-shaped coil pipe are fixedly connected with the water inlet pipe and the water outlet pipe respectively. A connecting pipe is fixedly connected to the upper end of the heat insulation shell, a connecting plate is fixedly connected to the arc surface of the connecting pipe, an upper flange pipe is fixedly connected to the surface of the connecting plate, a lower flange pipe is fixedly connected to the lower end of the heat insulation shell, and a filtering structure is arranged at the upper end of the connecting pipe. According to the low-temperature coal economizer, the filter structure is arranged, the filter plate can filter particulate matter in boiler smoke in the process that the low-temperature coal economizer is used at the tail of the coal-fired boiler, and therefore the situation that the particulate matter is attached to the outer wall of the S-shaped coil pipe is avoided, and the heat exchange efficiency of the low-temperature coal economizer is improved.

Description

Technical Field

[0001] This utility model relates to the field of economizer technology, and in particular to a low-temperature economizer for coal-fired boilers. Background Technology

[0002] A low-temperature economizer for coal-fired boilers is a device installed in the flue at the tail end of the boiler to recover waste heat from the flue gas. It preheats the boiler feedwater by absorbing heat from the exhaust gas. During use, the serpentine coils inside the economizer can transfer the heat from the boiler flue gas to the water flowing through it, thus preheating the water.

[0003] The above-mentioned and existing technologies have the following defects: During the use of the economizer, particulate matter in the boiler flue gas is easy to adhere to the surface of the economizer's serpentine coil, making it difficult for the heat of the boiler flue gas to be absorbed by the cold water in the serpentine coil, thereby reducing the heat exchange efficiency of the economizer.

[0004] Therefore, a low-temperature economizer for coal-fired boilers is proposed. Utility Model Content

[0005] The purpose of this invention is to address the problem that particulate matter in boiler flue gas easily adheres to the surface of the economizer's serpentine coil, making it difficult for the heat from the boiler flue gas to be absorbed by the cold water inside the serpentine coil. Therefore, a low-temperature economizer for coal-fired boilers is proposed.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a low-temperature economizer for a coal-fired boiler, comprising an insulation shell, wherein a plurality of serpentine coils are fixedly connected inside the insulation shell, an inlet pipe and an outlet pipe are fixedly connected to the outer wall of the insulation shell, the two ends of the serpentine coils are fixedly connected to the inlet pipe and the outlet pipe respectively, a connecting pipe is fixedly connected to the upper end of the insulation shell, a connecting plate is fixedly connected to the arc surface of the connecting pipe, an upper flange pipe is fixedly connected to the surface of the connecting plate, a lower flange pipe is fixedly connected to the lower end of the insulation shell, a filter structure is provided at the upper end of the connecting pipe, the filter structure includes an installation pipe, the two ends of the installation pipe are slidably connected to the connecting pipe and the upper flange pipe respectively, a filter plate is fixedly connected to the inner wall of the installation pipe, a sliding frame is slidably connected to the surface of the connecting plate, a limit ring is fixedly connected to the surface of the sliding frame, the vertical cross-section of the filter plate is an isosceles triangle, a leaf spring is fixedly connected to the arc surface of the upper flange pipe, and one end of the leaf spring is fixedly connected to the limit ring.

[0007] The effect achieved by the above components is as follows: by setting up a filter structure, during the use of a low-temperature economizer at the tail end of a coal-fired boiler, the filter plate can filter particulate matter in the boiler flue gas, thereby preventing particulate matter from adhering to the outer wall of the serpentine coil, thus improving the heat exchange efficiency of the low-temperature economizer.

[0008] Preferably, the arc surface of the mounting tube is fixedly connected with a support lug.

[0009] The effect achieved by the above components is that the movement of the lugs can drive the movement of the mounting tube, thereby facilitating the movement of the mounting tube.

[0010] Preferably, a sealing ring is fixedly connected to the inner wall of the limiting ring, and the sealing ring is slidably connected to the upper flange pipe and the mounting pipe.

[0011] The effect achieved by the above components is that the sealing ring can seal the gap between the limiting ring and the upper flange pipe and the installation pipe.

[0012] Preferably, a locking rod is slidably connected inside the sliding frame, and a perforated plate is fixedly connected to the surface of the connecting plate, wherein the size of the locking rod is adapted to the size of the perforated plate.

[0013] The effect achieved by the above components is that after the clamping rod is inserted into the orifice plate, the orifice plate reaches the position of the clamping rod, thereby limiting the position of the limiting ring and facilitating the subsequent placement of the installation pipe.

[0014] Preferably, a magnetic block is fixedly connected to one end of the lever, and the sliding frame is an iron frame.

[0015] The effect achieved by the above components is that when the locking rod is aligned with the hole plate, the magnetic block will move towards the sliding frame with the help of magnetic force, and the movement of the magnetic block will cause the locking rod to insert into the hole plate.

[0016] Preferably, an L-shaped plate is fixedly connected to the surface of the sliding frame, and the magnetic block is located between the short arm of the L-shaped plate and the sliding frame.

[0017] The effect achieved by the above components is that the L-shaped plate limits the movement distance of the magnetic block and prevents the lever from coming out of the slide frame.

[0018] Preferably, a stop block is fixedly connected to the surface of the connecting plate, and the stop block is located below the sliding frame.

[0019] The effect achieved by the above components is that the sliding frame will contact the stop block as it moves with the limiting ring, and the stop block will limit the position of the sliding frame, thereby limiting the position of the limiting ring.

[0020] Preferably, a positioning ring is fixedly connected to the arc surface of the mounting tube, and the positioning ring is engaged with the connecting tube.

[0021] The effect achieved by the above components is that the movement of the mounting tube will cause the positioning ring to insert into the connecting tube, and the positioning ring can restrict the position of the mounting tube.

[0022] Compared with the prior art, the advantages and positive effects of this utility model are as follows:

[0023] In this invention, by setting a filter structure, the filter plate can filter particulate matter in the boiler flue gas during the use of a low-temperature economizer at the tail end of a coal-fired boiler, thereby preventing particulate matter from adhering to the outer wall of the serpentine coil and improving the heat exchange efficiency of the low-temperature economizer. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0025] Figure 2 This is a cross-sectional structural diagram of the connecting pipe of this utility model;

[0026] Figure 3 This is a partial structural diagram of the connecting pipe of this utility model;

[0027] Figure 4 This is a schematic diagram of the installation pipe of this utility model.

[0028] Legend: 1. Insulation shell; 2. Snake coil; 3. Inlet pipe; 4. Outlet pipe; 5. Connecting pipe; 6. Connecting plate; 7. Upper flange pipe; 8. Filter structure; 801. Mounting pipe; 802. Filter plate; 803. Sliding frame; 804. Limiting ring; 805. Leaf spring; 806. Sealing ring; 807. Locking rod; 808. Orifice plate; 809. Magnetic block; 810. L-shaped plate; 811. Stop block; 812. Support lug; 813. Positioning ring; 9. Lower flange pipe. Detailed Implementation

[0029] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0030] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed in the following specification.

[0031] like Figures 1-4As shown, this utility model provides a low-temperature economizer for a coal-fired boiler, including an insulation shell 1. Several serpentine coils 2 are fixedly connected inside the insulation shell 1. An inlet pipe 3 and an outlet pipe 4 are fixedly connected to the outer wall of the insulation shell 1. The two ends of the serpentine coils 2 are fixedly connected to the inlet pipe 3 and the outlet pipe 4, respectively. A connecting pipe 5 is fixedly connected to the upper end of the insulation shell 1. A connecting plate 6 is fixedly connected to the arc surface of the connecting pipe 5. An upper flange pipe 7 is fixedly connected to the surface of the connecting plate 6. A lower flange pipe 9 is fixedly connected to the lower end of the insulation shell 1. A filter structure 8 is provided at the upper end of the connecting pipe 5. The filter structure 8 includes an installation pipe 801. The two ends of the installation pipe 801 are slidably connected to the connecting pipe 5 and the upper flange pipe 7, respectively. A filter plate 802 is fixedly connected to the inner wall of the installation pipe 801. The surface of the connecting plate 6 is slidably connected to... A sliding frame 803 is connected, and a limiting ring 804 is fixedly connected to the surface of the sliding frame 803. The vertical cross-section of the filter plate 802 is an isosceles triangle. A leaf spring 805 is fixedly connected to the arc surface of the upper flange pipe 7. One end of the leaf spring 805 is fixedly connected to the limiting ring 804. When the leaf spring 805 extends, the limiting ring 804 will slide downward with the elastic force of the leaf spring 805. A support lug 812 is fixedly connected to the arc surface of the mounting pipe 801. When the support lug 812 moves, it can drive the mounting pipe 801 to move, thereby facilitating the movement of the mounting pipe 801. A sealing ring 806 is fixedly connected to the inner wall of the limiting ring 804. The sealing ring 806 is slidably connected to the upper flange pipe 7 and the mounting pipe 801. The sealing ring 806 can seal the gap between the limiting ring 804 and the upper flange pipe 7 and the mounting pipe 801.

[0032] like Figures 2-4As shown, a locking rod 807 is slidably connected inside the sliding frame 803. A perforated plate 808 is fixedly connected to the surface of the connecting plate 6. The size of the locking rod 807 matches the size of the perforated plate 808. After the locking rod 807 is inserted into the perforated plate 808, the perforated plate 808 restricts the position of the locking rod 807, thereby restricting the position of the limiting ring 804, which facilitates the subsequent placement of the installation tube 801. A magnetic block 809 is fixedly connected to one end of the locking rod 807. The sliding frame 803 is an iron frame. When the locking rod 807 is aligned with the perforated plate 808, the magnetic block 809 will move towards the sliding frame 803 by magnetic force. The movement of the magnetic block 809 will cause the locking rod 807 to be inserted into the perforated plate 808. An L-shaped plate 810 is fixedly connected to the surface of the sliding frame 803. 9 is located between the short arm of the L-shaped plate 810 and the slide frame 803. The L-shaped plate 810 limits the movement distance of the magnetic block 809 and prevents the locking rod 807 from coming out of the slide frame 803. A stop block 811 is fixedly connected to the surface of the connecting plate 6. The stop block 811 is located below the slide frame 803. When the slide frame 803 moves with the limiting ring 804, it will contact the stop block 811. The stop block 811 limits the position of the slide frame 803, thereby limiting the position of the limiting ring 804. A positioning ring 813 is fixedly connected to the arc surface of the mounting tube 801. The positioning ring 813 is engaged with the connecting tube 5. When the mounting tube 801 moves, the positioning ring 813 will be inserted into the connecting tube 5. The positioning ring 813 can limit the position of the mounting tube 801.

[0033] The overall working principle is as follows: When using a low-temperature economizer at the tail end of a coal-fired boiler to filter particulate matter in the boiler flue gas, the limiting ring 804 moves upward. The sliding of the limiting ring 804 causes the sliding frame 803 to slide along the surface of the connecting plate 6. The movement of the sliding frame 803 causes the locking rod 807 to move. When the locking rod 807 is aligned with the orifice plate 808, the magnetic block 809 moves towards the sliding frame 803 by means of magnetic force. The movement of the magnetic block 809 causes the locking rod 807 to insert into the orifice plate 808. The orifice plate 808 reaches the position that limits the locking rod 807, thereby limiting the limiting ring 804. Position 04 facilitates the subsequent placement of the mounting tube 801. The movement of the limiting ring 804 compresses the leaf spring 805, allowing the mounting tube 801 to move with the aid of the lug 812. This movement of the mounting tube 801 causes the positioning ring 813 to move. Once the mounting tube 801 is positioned between the upper flange tube 7 and the connecting tube 5, it moves downwards. This movement causes the positioning ring 813 to insert into the connecting tube 5, thus restricting the position of the mounting tube 801. Then, the magnetic block 809 is pulled away from the sliding frame 803, at which point the L-shaped plate 810 reaches its limit. The movement distance of the magnetic block 809 prevents the locking rod 807 from dislodging from the slide frame 803. When the locking rod 807 disengages from the orifice plate 808, the leaf spring 805 extends, and the limiting ring 804 slides downward with the elastic force of the leaf spring 805. The movement of the limiting ring 804 drives the sealing ring 806 to move. The sealing ring 806 can seal the gap between the limiting ring 804 and the upper flange pipe 7 and the mounting pipe 801. The limiting ring 804 can further restrict the position of the mounting pipe 801. The slide frame 803 moves with the limiting ring 804 and contacts the stop block 811. The stop block 811 reaches the limit. The position of the sliding frame 803 restricts the position of the limiting ring 804. When the boiler flue gas flows through the upper flange pipe 7, the filter plate 802 can filter the particulate matter in the boiler flue gas, thereby preventing the particulate matter from adhering to the outer wall of the serpentine coil 2. Then the boiler flue gas will be discharged into the heat insulation shell 1 through the connecting pipe 5, and at the same time, cold water will be discharged into the serpentine coil 2 through the water inlet pipe 3. During this process, the serpentine coil 2 will transfer heat to the cold water to heat the cold water. Then the hot water will be discharged through the water outlet pipe 4. Then the boiler flue gas will be discharged into other pipelines through the lower flange pipe 9.

[0034] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the protection scope of the technical solution of the present utility model.

Claims

1. Low-temperature economizer for coal-fired boilers, comprising a thermally insulated shell (1), characterized in that: The heat insulation shell (1) is fixedly connected with several serpentine coils (2). The outer wall of the heat insulation shell (1) is fixedly connected with an inlet pipe (3) and an outlet pipe (4). The two ends of the serpentine coils (2) are fixedly connected to the inlet pipe (3) and the outlet pipe (4) respectively. The upper end of the heat insulation shell (1) is fixedly connected with a connecting pipe (5). The arc surface of the connecting pipe (5) is fixedly connected with a connecting plate (6). The surface of the connecting plate (6) is fixedly connected with an upper flange pipe (7). The lower end of the heat insulation shell (1) is fixedly connected with a lower flange pipe (9). The upper end of the connecting pipe (5) is provided with a filter structure (8). The filter structure (8) includes an installation tube (801), the two ends of which are slidably connected to a connecting tube (5) and an upper flange tube (7) respectively. A filter plate (802) is fixedly connected to the inner wall of the installation tube (801). A sliding frame (803) is slidably connected to the surface of the connecting plate (6). A limiting ring (804) is fixedly connected to the surface of the sliding frame (803). The vertical cross section of the filter plate (802) is an isosceles triangle. A leaf spring (805) is fixedly connected to the arc surface of the upper flange tube (7). One end of the leaf spring (805) is fixedly connected to the limiting ring (804).

2. The low-temperature coal economizer for coal-fired boilers according to claim 1, characterized in that: The arc surface of the mounting tube (801) is fixedly connected to a lug (812).

3. The low temperature coal economizer for coal fired boilers of claim 1, wherein: The inner wall of the limiting ring (804) is fixedly connected to a sealing ring (806), and the sealing ring (806) is slidably connected to the upper flange pipe (7) and the mounting pipe (801).

4. The low temperature coal economizer for coal fired boilers of claim 1, wherein: A locking rod (807) is slidably connected inside the sliding frame (803), and a perforated plate (808) is fixedly connected to the surface of the connecting plate (6). The size of the locking rod (807) is adapted to the size of the perforated plate (808).

5. The low-temperature coal economizer for coal-fired boilers according to claim 4, characterized in that: A magnetic block (809) is fixedly connected to one end of the lever (807), and the sliding frame (803) is an iron frame.

6. The low-temperature coal economizer for coal-fired boilers according to claim 5, characterized in that: An L-shaped plate (810) is fixedly connected to the surface of the sliding frame (803), and the magnetic block (809) is located between the short arm of the L-shaped plate (810) and the sliding frame (803).

7. The low temperature coal economizer for coal fired boilers of claim 1, wherein: A stop (811) is fixedly connected to the surface of the connecting plate (6), and the stop (811) is located below the slide frame (803).

8. The low temperature coal economizer for coal fired boilers of claim 1, wherein: The arc surface of the mounting tube (801) is fixedly connected to a positioning ring (813), and the positioning ring (813) is engaged with the connecting tube (5).

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