High-temperature heat exchanger with online ash removal function

Abstract

The high-temperature heat exchanger with the on-line ash removal function comprises a heat exchanger body, a heat exchange tube bundle is arranged in the heat exchanger body, and an ash-containing flue gas inlet and an ash-containing flue gas outlet are formed in the two ends of the heat exchanger body respectively. A cold-side ash-free flue gas outlet and a cold-side ash-free flue gas inlet are formed in the upper portion of the heat exchanger body and located at the two ends of the heat exchange tube bundle respectively, an ash blowing device is arranged in the heat exchanger body, a plurality of ash blowing openings are formed in an ash blowing gun tube and connected with an ash blowing thin tube seat, a connecting clamping hook is arranged on the ash blowing thin tube seat, and the clamping hook is clamped in a clamping hook groove of an ash blowing thin tube. The clamping hook groove comprises a straight section and a transverse section, a spring piece is arranged in the straight section, and the tail end of the clamping hook is clamped in the transverse section; the inspection manhole and the heat exchanger body are of a high-temperature blocking structure, and heat conduction is reduced; and the soot blowing thin pipe easy to disassemble and assemble is arranged, a more appropriate air blowing opening can be replaced according to different soot blowing conditions, replacement is convenient, and practicability is high.

Description

Technical Field

[0001] The utility model belongs to the technical field of heat exchange, and particularly relates to a high-temperature heat exchanger with an online ash cleaning function. Background Art

[0002] High-temperature heat exchangers play an important role in industrial production, especially in high-temperature and high-dust environments, such as the steel, power, and chemical industries. However, in a high-temperature environment, dust is likely to accumulate on the surface of the heat exchanger, resulting in a reduction in heat exchange efficiency and a shortening of the equipment life. Most of the high-temperature heat exchangers on the market at present do not have an online ash cleaning function, or there is no high-temperature heat exchanger that can operate stably for a long time in a high-temperature and high-dust environment, which affects the production efficiency and the continuity of equipment operation, and does not have a soot blowing device with a replaceable outlet of the soot blowing gun. Therefore, developing a high-temperature heat exchanger with an online ash cleaning function is of great significance for improving production efficiency and extending the equipment life. Summary of the Utility Model

[0003] The purpose of the utility model is to provide a high-temperature heat exchanger with an online ash cleaning function to solve the problems raised in the above background art.

[0004] To achieve the above purpose, the utility model provides the following technical solution: A high-temperature heat exchanger with an online ash cleaning function includes a heat exchanger body. A heat exchange tube bundle is arranged inside the heat exchanger body. The two ends of the heat exchanger body are respectively set as an ash-containing flue gas inlet and an ash-containing flue gas outlet. A cold-side ash-free flue gas outlet and a cold-side ash-free flue gas inlet are respectively arranged above the heat exchanger body and at both ends of the heat exchange tube bundle. A soot blowing device is arranged inside the heat exchanger body. The soot blowing device includes a soot blower, a controller, and a compressed air tank. The soot blower includes a soot blowing gun barrel and a soot blower gun head. The soot blower gun head is connected to the compressed air tank. The controller is connected to control the soot blower gun head. A plurality of soot blowing ports are opened on the soot blowing gun barrel. The soot blowing ports are connected to soot blowing fine tube seats. A connecting hook is arranged on the soot blowing fine tube seat. The hook is clamped in the hook groove of the soot blowing fine tube. The hook groove includes a straight section and a transverse section. A spring piece is arranged in the straight section. The end of the hook is clamped in the transverse section.

[0005] Preferably, a maintenance manhole is arranged in the middle of the heat exchanger body. The maintenance manhole is connected to the heat exchanger body through a flange, and a gasket is arranged between the flanges.

[0006] Preferably, the bolt holes opened on the flange are connected by bolts, and a lining cotton is arranged in the bolt holes.

[0007] Preferably, the soot blowing gun barrel is connected to the heat exchanger body through a fixing plate. A sleeve is arranged at the connection between the soot blowing gun barrel and the fixing plate, and a layer of heat insulation cotton is wrapped outside the sleeve.

[0008] Preferably, soot blowers are provided inside both the inlet and outlet of the ash-containing flue gas and in the middle of the heat exchange tube bundle. The blowing ports of the soot blower barrels inside the inlet and outlet of the ash-containing flue gas are arranged on the side facing the heat exchange tube bundle. The blowing ports of the soot blower barrels of the soot blower in the middle of the heat exchange tube bundle are opened on both sides, and the blowing ports on both sides of the soot blower barrel are arranged in a staggered and alternating manner.

[0009] Preferably, two groups of heat exchange tube bundles are provided, which are composed of multiple heat exchange tubes. Among them, the high-temperature section tube bundle is in a serpentine or spiral shape, and the low-temperature section is a straight tube, arranged inside the heat exchanger body.

[0010] Preferably, an expansion joint is provided between one side of the heat exchanger body and the outlet of the ash-containing flue gas.

[0011] Preferably, a soot cleaning port is also provided on the heat exchanger body.

[0012] The technical effects and advantages of the present utility model are as follows: 1. Compared with the existing fixing method of the soot blower, the two soot blowers at the inlet and outlet have half of the holes opened and rotate 180 degrees, only purging the tube bundles at the inlet and outlet, preventing the influence on the furnace pressure; the soot blower provided in the middle section has holes opened on both sides, with staggered and alternating holes, and the rotation angle is 360 degrees, which can purge the tube bundles on both sides of the soot blower, and the soot blowing is more comprehensive;

[0013] 2. The maintenance manhole and the heat exchanger body are made into a high-temperature blocking structure to reduce heat conduction;

[0014] 3. A detachable soot blowing thin tube is provided, which can replace a more suitable blowing port according to different soot blowing conditions, and the replacement is convenient and the practicability is strong;

[0015] 4. A sleeve is provided at the connection between the soot blower barrel and the fixing plate, avoiding the problem that the soot blower barrel is easily cut due to wear and deformation during long-term operation, and ensuring the operation efficiency and stability of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a top view structural schematic diagram of the present utility model;

[0017] Figure 2 It is a side view structural schematic diagram of the present utility model;

[0018] Figure 3 It is a structural schematic diagram of the soot blowers on both sides of the present utility model;

[0019] Figure 4 is Figure 3 the enlarged structural schematic diagram at A in

[0020] Figure 5 It is a partial cross-sectional view of the connection between the soot blowing thin tube and the soot blowing thin tube seat;

[0021] Figure 6This is a schematic diagram of the soot blower structure in the middle of the present utility model.

[0022] In the figure: 1, ash-containing flue gas inlet; 2, cold-side ash-free flue gas outlet; 3, heat exchange tube bundle; 4, cold-side ash-free flue gas inlet; 5, maintenance manhole; 6, ash cleaning port; 7, fixed plate; 8, expansion joint; 9, ash-containing flue gas outlet; 10, soot blower gun head; 11, soot blower barrel; 12, soot blowing fine tube seat; 13, hook; 14, soot blowing fine tube; 15, straight section; 16, cross section; 17, spring piece. Specific embodiments

[0023] The following further describes the specific embodiments of the present utility model in conjunction with the accompanying drawings. It should be noted here that the description of these embodiments is used to help understand the present utility model, but does not constitute a limitation to the present utility model. In addition, the technical features involved in the various embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other.

[0024] The present utility model provides a high-temperature heat exchanger with an on-line ash cleaning function as shown in Figure 1 and Figure 2 which includes a heat exchanger body. A heat exchange tube bundle 3 is arranged inside the heat exchanger body. The two ends of the heat exchanger body are respectively provided with an ash-containing flue gas inlet 1 and an ash-containing flue gas outlet 9. A high-temperature valve is provided at the front end of the ash-containing flue gas inlet 1 to control the gas flow. Cold-side ash-free flue gas outlets 2 and cold-side ash-free flue gas inlets 4 are respectively arranged at the upper part of the heat exchanger body and at both ends of the heat exchange tube bundle 3. A soot blowing device is arranged inside the heat exchanger body. The soot blowing device includes a soot blower, a controller and a compressed air tank. The soot blower includes a soot blower barrel 11 and a soot blower gun head 10. The soot blower gun head 10 is connected to the compressed air tank. The controller is controllably connected to the soot blower gun head 10. The soot blower gun head 10 includes a control valve, and the opening and closing size is controlled by the controller to control the blowing gas volume. The controller is responsible for the operation and monitoring of the entire heat exchanger. The controller real-time monitors parameters such as the temperature and pressure inside the heat exchanger through sensors, and adjusts the valves on the intake pipe and the outlet pipe as needed to control the gas flow. At the same time, the controller is also responsible for controlling the operation of the on-line ash cleaning device. According to the set ash cleaning cycle or the monitored decline in the performance of the heat exchanger, the on-line ash cleaning device is automatically started for ash cleaning. The related functions of the controller are prior art and will not be elaborated here.

[0025] As shown in Figure 4 and Figure 5As shown in the figure, a number of soot blowing openings are provided on the soot blowing gun barrel 11. The soot blowing openings are connected to the soot blowing fine pipe seat 12. A connecting hook 13 is provided on the soot blowing fine pipe seat 12. The hook 13 is clamped in the hook groove of the soot blowing fine pipe 14. The hook groove includes a straight section 15 and a transverse section 16. A spring piece 17 is arranged in the straight section 15. The end of the hook 13 is clamped in the transverse section 16. During installation, only need to align the hook groove of the soot blowing fine pipe 14 with the hook 13 and insert it. Under the push of the spring piece 17, the hook 13 is clamped on the transverse section 16 to complete the connection, which is very convenient and not easy to fall off. When disassembling, twist the soot blowing fine pipe 14 towards the spring piece 17 to compress the spring piece 17, and the hook 13 disengages from the transverse section 16, then it can be pulled out.

[0026] Specifically, a maintenance manhole 5 is provided in the middle of the heat exchanger body. The maintenance manhole 5 is connected to the heat exchanger body through a flange, and an aluminosilicate gasket is arranged between the flanges, which is heat-resistant.

[0027] Specifically, the bolt holes provided on the flange are connected by bolts, and cotton linings are arranged in the bolt holes; the thickness of the cotton lining is 1.5 mm, and the opening is slightly larger than the bolt diameter, which effectively reduces the heat conduction of the bolts and reduces heat loss.

[0028] Specifically, the soot blowing gun barrel 11 is connected to the heat exchanger body through a fixing plate 7. A sleeve is arranged at the connection between the soot blowing gun barrel 11 and the fixing plate 7 to prevent the soot blowing gun barrel 11 from directly contacting the fixing plate 7, thus avoiding the problem of wear and deformation during long-term operation and easily cutting off the soot blowing gun barrel 11. A layer of heat insulation cotton is wrapped outside the sleeve to effectively protect the gun barrel and avoid the problem of easy deformation and misalignment of the soot blowing openings under high-temperature working conditions.

[0029] Specifically, soot blowers are arranged on the inner sides of the ash-containing flue gas inlet 1 and the ash-containing flue gas outlet 9 and in the middle of the heat exchange tube bundle 3. The soot blower in the middle of the heat exchange tube bundle 3 is arranged on the opposite side of the maintenance manhole 5. The soot blowing openings of the soot blowing gun barrels 11 of the left and right soot blowers are arranged on the side facing the heat exchange tube bundle 3, as Figure 3 shown. The soot blowing openings of the soot blowing gun barrel 11 of the middle soot blower are arranged on both sides, as Figure 6 shown, and the soot blowing openings on both sides of the soot blowing gun barrel 11 are arranged in a staggered and alternating manner. The soot blowing gun barrels 11 of the left and right soot blowers can be rotated 180 degrees under the drive of a motor to only blow the inlets and outlets of the heat exchange tube bundle 3, and the middle soot blowing gun barrel 11 can be rotated 360 degrees to blow the tube bundles on both sides of the soot blower.

[0030] Specifically, two groups of heat exchange tube bundles 3 are provided, which are composed of multiple heat exchange tubes. Among them, the high-temperature section tube bundle (the left heat exchange tube bundle) is serpentine, and the low-temperature section (the right heat exchange tube bundle, not shown in the figure) is a straight tube, both arranged inside the heat exchanger body; the serpentine heat exchange tube bundle 3 is used to increase the heat exchange area and at the same time provide a certain expansion margin to prevent the heat exchange tubes from being misaligned and the tube sheet from being cracked due to thermal expansion at high temperatures; the heat exchange tube material is selected as high-temperature resistant stainless steel, which has good thermal conductivity.

[0031] Specifically, an expansion joint 8 is provided between one side of the heat exchanger body and the ash-containing flue gas outlet 9 to provide a certain expansion margin and prevent the heat exchanger body from being misaligned due to thermal expansion.

[0032] Specifically, a dust cleaning port 6 is also provided on the heat exchanger body. The dust cleaning port 6 is opened on the side with more ash and extends to the heat exchange tube bundle 3, so that the ash accumulated between the heat exchange tube bundles 3 can be directly cleaned.

[0033] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A high-temperature heat exchanger with an online dust cleaning function, comprising a heat exchanger body, a heat exchange tube bundle (3) is arranged in the heat exchanger body, an ash-containing flue gas inlet (1) and an ash-containing flue gas outlet (9) are arranged at two ends of the heat exchanger body, a cold side ash-free flue gas outlet (2) and a cold side ash-free flue gas inlet (4) are arranged at the upper part of the heat exchanger body and at two ends of the heat exchange tube bundle (3), and the characteristics are: A sootblowing device is arranged in the heat exchanger body, and the sootblowing device comprises a sootblower, a controller and a compressed air tank. The sootblower comprises a sootblowing gun barrel (11) and a sootblower gun head (10). The sootblower gun head (10) is connected to the compressed air tank, and the controller controls the connection of the sootblower gun head (10). The sootblowing gun barrel (11) is provided with a plurality of sootblowing ports, and the sootblowing ports are connected to a sootblowing capillary seat (12). A connecting hook (13) is arranged on the sootblowing capillary seat (12), and the hook (13) is engaged in a hook groove of a sootblowing capillary tube (14). The hook groove comprises a straight section (15) and a transverse section (16). A spring sheet (17) is arranged in the straight section (15), and the end of the hook (13) is engaged in the transverse section (16).

2. A high-temperature heat exchanger with online dust cleaning function according to claim 1, characterized in that: A maintenance manhole (5) is arranged in the middle of the heat exchanger body, the maintenance manhole (5) is connected to the heat exchanger body via a flange, and a sealing gasket is arranged between the flanges.

3. A high temperature heat exchanger with online dust cleaning function according to claim 2, characterized in that: The bolt holes opened on the flange are connected by bolts, and lining cotton is arranged in the bolt holes.

4. A high-temperature heat exchanger with online dust cleaning function according to claim 1, characterized in that: The sootblowing gun tube (11) is connected to the heat exchanger body through a fixing plate (7), a sleeve is provided at the connection between the sootblowing gun tube (11) and the fixing plate (7), and a layer of heat-insulating cotton is wrapped outside the sleeve.

5. The high-temperature heat exchanger with online dust cleaning function according to claim 1, characterized in that: Sootblowers are arranged on the inner sides of the ash-containing flue gas inlet (1) and the ash-containing flue gas outlet (9) and in the middle of the heat exchange tube bundle (3); the sootblowing ports of the sootblowing gun tube (11) on the inner sides of the ash-containing flue gas inlet (1) and the ash-containing flue gas outlet (9) are arranged on the side facing the heat exchange tube bundle (3); the sootblowing ports of the sootblowing gun tube (11) of the sootblower in the middle of the heat exchange tube bundle (3) are opened on both sides, and the sootblowing ports on both sides of the sootblowing gun tube (11) are staggered and alternately arranged.

6. A high-temperature heat exchanger with online dust cleaning function according to claim 1, characterized in that: The heat exchange tube bundle (3) is arranged in two groups, and is composed of a plurality of heat exchange tubes, wherein the high temperature section tube bundle is in a serpentine or spiral shape, and the low temperature section is a straight tube, which is arranged inside the heat exchanger body.

7. The high-temperature heat exchanger with online dust cleaning function according to claim 1, characterized in that: An expansion joint (8) is arranged between one side of the heat exchanger body and the ash-containing flue gas outlet (9).

8. The high-temperature heat exchanger with online dust cleaning function according to claim 1, characterized in that: The heat exchanger body is also provided with a dust cleaning port (6).

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