Safety protection type flue gas deep cooler with heat exchange tubes

Abstract

A heat exchange tube safety protection type flue gas deep cooler comprises a water inlet collecting tank, a plurality of heat exchange tubes which are connected with the water inlet collecting tank and are connected in a tube row shape, a U-shaped tube elbow, a water outlet collecting tank, two side tube plates, a middle tube plate and a detachable protection tube. The L-shaped embedded connecting plates are mounted on the side tube plates and the middle tube plate respectively, the center lines of the plates in the thickness direction are consistent with the center lines of the corresponding detachable protective tubes, the ends of the L-shaped embedded connecting plates are positioned, and the L-shaped embedded connecting plates are inserted into end notches of the detachable protective tubes and used for connecting the two ends of the detachable protective tubes; the inner baffle and the outer baffle are mounted on the L-shaped embedded connecting plate through fastening bolts and are used for positioning the detachable protective pipe. According to the heat exchange tube safety protection type flue gas deep cooler, the heat exchange efficiency is improved, the steel consumption can be reduced, the service life of the heat exchange tube is long, and the detachable protection tube is convenient to replace and reliable in positioning. The device can be widely applied to the flue gas waste heat exchange treatment process in electric power and metallurgical industries.

Description

[0001] The invention relates to a heat exchange tube safety protection type flue gas deep cooler, which can be widely used in the flue gas waste heat heat exchange treatment process in the electric power and metallurgical industries. Background Art

[0002] In the existing flue gas heat exchanger, since the flue gas after boiler combustion contains a large amount of fly ash particles, these fly ash particles have a certain kinetic energy. When the flue gas flushes the heating surface of the heat exchange tube of the flue gas heat exchanger, the fly ash particles continuously impact the tube wall. Each impact cuts off an extremely small piece of metal particles from the tube wall, causing the heat exchange tube to wear and shortening the service life of the flue gas heat exchanger. Summary of the invention

[0003] The object of the present invention is to provide a heat exchange tube safety protection type flue gas deep cooler which improves heat exchange efficiency, saves steel consumption, has a long service life of heat exchange tubes, is easy to replace detachable protection tubes, and has reliable positioning.

[0004] In order to achieve the above-mentioned purpose, the heat exchange tube safety protection type flue gas deep cooler of the present invention comprises a water inlet collecting box provided with a water inlet pipe, a plurality of heat exchange tubes connected to the water inlet collecting box and connected in a tube row shape, a plurality of U-shaped tube elbows connecting the two ends of adjacent heat exchange tubes to each other in a snake shape, a water outlet collecting box provided with a water outlet pipe and connected to the heat exchange tube, two side tube sheets provided with tube holes and installed on the two ends of the heat exchange tube along the axial direction of the heat exchange tube, a middle tube sheet provided with tube holes and installed on the middle part of the heat exchange tube along the axial direction of the heat exchange tube, a plurality of detachable protection tubes located in front of the tube row of the heat exchange tube, facing the flow direction of the ash-containing flue gas and provided with end notches, respectively installed on the side tube sheet and the middle tube sheet, the center line in the plate thickness direction is consistent with the center line of the corresponding detachable protection tube, the end is positioned, and the end is inserted into the end notch of the detachable protection tube for connecting the two ends of the detachable protection tube, and the inner baffle plate and the outer baffle plate installed on the L-shaped embedded connecting plate by fastening bolts for positioning the detachable protection tube.

[0005] The heat exchange tube safety protection type flue gas deep cooler of the present invention has two rows of detachable protection tubes.

[0006] The heat exchange tube safety protection type flue gas deep cooler of the present invention, the heat exchange tube is a fin heat exchange tube.

[0007] The heat exchange tube safety protection type flue gas deep cooler of the present invention, the finned heat exchange tube, the fins of which are square fins, circular fins, or spiral fins.

[0008] The heat exchange tube safety protection type flue gas deep cooler of the present invention has two sides and the middle of the heat exchange tube fixed by welding with the side tube sheet and the middle tube sheet, and the two sides of the hollow round tube of the heat exchange tube are connected by U-shaped elbows and the hollow round tubes are welded, and a medium inlet and outlet are respectively arranged on the same side of the front and back of the tube row, and multiple layers of tube rows can be arranged in the direction of the number of layers. In order to simultaneously inlet and outlet water, a water collecting box is arranged at the water inlet and outlet of the tube row, and the openings on the water collecting box correspond to the number of layers of the tube row, and it is connected to the heat exchange tube by welding, so that the medium can enter each layer of the tube row through the water collecting box at the same time.

[0009] The heat exchange tube safety protection type flue gas deep cooler of the present invention has a detachable protection tube, which adopts an L-shaped embedded connection plate convex-concave connection structure and is then positioned by inner and outer baffles. Directly facing the flue gas scouring, the fly ash particles continuously impact the tube wall, playing a safety protection role and preserving the heat exchange tube.

[0010] The heat exchange tube safety protection type flue gas deep cooler of the present invention has, on the one hand, the fins of the finned heat exchange tubes are directly welded on the heating surface tubes, and the flue gas heat absorbed by them is directly transferred to the heating surface tubes, which increases the area of ​​the heating tubes, increases the temperature of the medium in the tubes, has a large heat exchange area, and improves the heat exchange efficiency. On the other hand, the heat exchange tubes are connected by U-shaped tube elbows, and the ends of all heat exchange tube rows must be connected into a passage at one time, with the medium flowing in at one end and flowing out at the other end. The front and back are connected by large-radius U-shaped tubes, which can effectively reduce the resistance of the medium flow in the tubes and also improve the heat exchange efficiency.

[0011] The heat exchange tube safety protection type flue gas deep cooler of the present invention adopts a countercurrent flow arrangement of the outer medium and the inner medium of the tube. When the heat transfer amount and the total heat transfer coefficient of the heat exchanger are determined, a countercurrent arrangement is adopted, and the required heat transfer area of ​​the heat exchanger is smaller, which can save steel consumption, optimize the heat exchange area, and save the amount of heating medium or cooling medium.

[0012] In the heat exchange tube safety protection type flue gas deep cooler of the present invention, the detachable protection tube is installed in the front row of the heat exchange tube, at the smoke-facing side, to play the role of a safety protection barrier. When dusty flue gas scours, the detachable protection tube is scourred first, that is, the detachable protection tube directly bears the strong scouring of the flue gas to protect the heat exchange tube from being worn by fly ash, so the heat exchange tube has a long service life.

[0013] The heat exchange tube safety protection type flue gas deep cooler of the present invention is very convenient to replace even if the detachable protection tube is damaged by impact. It can be replaced by loosening the fastener, and both disassembly and installation are convenient. Therefore, the detachable protection tube is easy to replace. In addition, the fastener connection method can interchange the detachable protection tubes in different areas, effectively extending the service life of the heat exchange tube at the rear of the detachable protection tube, thereby improving the effective utilization rate of the entire heat exchanger.

[0014] The heat exchange tube safety protection type flue gas deep cooler of the present invention has end notches of a certain depth at both ends of the detachable protection tube. Since the tube has the physical property of expanding due to heat in the flue, there is a certain movable space along the axial direction of the tube after being assembled with the L-shaped embedded connecting plate, which can adapt to the change of flue gas temperature under different loads of the boiler unit. From the running state to the shutdown state, the detachable protection tube row can be guaranteed to be firmly installed, so the positioning is reliable.

[0015] In summary, the heat exchange tube safety protection type flue gas deep cooler of the present invention improves heat exchange efficiency, can save steel consumption, has a long service life of the heat exchange tube, and the detachable protection tube is easy to replace and has reliable positioning. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention is further described below in conjunction with the accompanying drawings and embodiments thereof.

[0017] Figure 1 It is a front view of the present invention; Figure 2 is a rear view of the present invention; Figure 3 yes Figure 1 A top view of Figure 4 yes Figure 1 A local enlarged view of point A in FIG. Figure 5 yes Figure 3 A local enlarged view of point B in FIG. Figure 6 yes Figure 3 A local enlarged view of point C in FIG. Figure 7 yes Figure 1 A magnified view of the removable protective tube; Figure 8 yes Figure 7 Left view of Fig. 9 yes Figure 3 Schematic diagram of the L-shaped embedded connecting plate structure. DETAILED DESCRIPTION

[0018] exist Figures 1 to 9The heat exchange tube safety protection type flue gas deep cooler of the present invention comprises a water inlet header 1 provided with a water inlet pipe 11, A plurality of heat exchange tubes 2 connected to the water inlet header and connected in a tube row shape, a plurality of U-shaped tube elbows 3 connecting the two ends of adjacent heat exchange tubes to each other in a snake shape, a water outlet header 4 provided with a water outlet pipe 12 and connected to the heat exchange tubes, two side tube sheets 5 provided with tube holes and installed on the two ends of the heat exchange tubes along the axial direction of the heat exchange tubes, a middle tube sheet 6 provided with tube holes and installed on the middle part of the heat exchange tubes along the axial direction of the heat exchange tubes, a plurality of detachable protective tubes 7 located in front of the tube row of the heat exchange tubes, facing the flow direction of the ash-containing flue gas, and provided with end notches a, L-shaped embedded connecting plates 8 for connecting the two ends of the detachable protective tubes are respectively installed on the side tube sheets and the middle tube sheets, the center lines in the plate thickness direction are consistent with the center lines of the corresponding detachable protective tubes, the ends are positioned, and inserted into the end notches of the detachable protective tubes, and the inner baffles 9 and the outer baffles 10 for positioning the detachable protective tubes are installed on the L-shaped embedded connecting plates by fastening bolts 13.

[0019] In the heat exchange tube safety protection type flue gas deep cooler of the present invention, the detachable protection tubes 8 are arranged in two rows.

[0020] The heat exchange tube safety protection type flue gas deep cooler of the present invention, the heat exchange tube 2 is a finned heat exchange tube.

[0021] The heat exchange tube safety protection type flue gas deep cooler of the present invention, the finned heat exchange tube, the fins 14 of which are square fins, circular fins, or spiral fins.

[0022] exist Figure 3 In the figure, the flow direction of ash-containing flue gas is b.

[0023] exist Fig. 9 In the embodiment, the L-shaped embedded connecting plate 8, its L-shaped flange d, together with the inner baffle, is used for positioning the side of the detachable protection tube 7. A connecting hole e for bolt connection is provided.

[0024] The present invention is based on a heat exchange tube safety protection type flue gas deep cooler. The above is only a preferred embodiment of the present invention, and does not impose any form of limitation on the present invention. Although the present invention has been disclosed as above in the preferred embodiment, it is not used to limit the present invention. Any technician familiar with this profession can make some changes or modifications to equivalent embodiments of equivalent changes using the technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent replacement and improvement of the above embodiments made according to the technical essence of the present invention, within the spirit and principles of the present invention, still fall within the protection scope of the technical solution of the present invention.

Claims

1. A heat exchange tube safety protection type flue gas deep cooler, characterized in that: It includes a water inlet collecting box provided with a water inlet pipe, a plurality of heat exchange tubes connected to the water inlet collecting box and connected in a tube row shape, a plurality of U-shaped tube elbows connecting the two ends of adjacent heat exchange tubes to each other in a snake shape, a water outlet collecting box provided with a water outlet pipe and connected to the heat exchange tube, two side tube sheets provided with tube holes and installed on the two ends of the heat exchange tube along the axial direction of the heat exchange tube, a middle tube sheet provided with tube holes and installed on the middle part of the heat exchange tube along the axial direction of the heat exchange tube, a plurality of detachable protective tubes located in front of the tube row of the heat exchange tube, facing the flow direction of the ash-containing flue gas and provided with end notches, an L-shaped embedded connecting plate for connecting the two ends of the detachable protective tube, which is respectively installed on the side tube sheet and the middle tube sheet, the center line in the plate thickness direction is consistent with the center line of the corresponding detachable protective tube, the end is positioned, and is inserted into the end notch of the detachable protective tube, and an inner baffle and an outer baffle installed on the L-shaped embedded connecting plate by fastening bolts for positioning the detachable protective tube.

2. The heat exchange tube safety protection type flue gas deep cooler according to claim 1 is characterized in that: The detachable protective tubes are arranged in two rows.

3. The heat exchange tube safety protection type flue gas deep cooler according to claim 1 is characterized in that: The heat exchange tube is a finned heat exchange tube.

4. The heat exchange tube safety protection type flue gas deep cooler according to claim 3 is characterized in that: The finned heat exchange tube has fins that are square fins, circular fins, or spiral fins.

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