Modularized heat exchange unit structure of wide-channel plate type low-temperature economizer

Abstract

The modularized heat exchange unit structure of the wide-channel plate type low-temperature economizer comprises a low-temperature economizer body, a high-temperature flue gas inlet pipe and a medium inlet pipe are installed on the top side of the low-temperature economizer body, and a high-temperature flue gas outlet pipe and a medium outlet pipe are installed on the other side of the low-temperature economizer body. Meanwhile, a high-temperature flue gas filtering assembly is fixedly installed on the high-temperature flue gas inlet pipe, a medium filtering assembly is fixedly installed on the medium inlet pipe, and the high-temperature flue gas filtering assembly comprises an outlet pipe fixedly connected with the high-temperature flue gas inlet pipe through a flange. According to the modularized heat exchange unit structure of the wide-channel plate-type low-temperature economizer, large-particle impurities in smoke and a liquid medium are prevented from adhering to the inner wall of the low-temperature economizer body, the cleanliness of the interior of the low-temperature economizer body is guaranteed, and dirt and impurities on the inner wall of the low-temperature economizer can be prevented from being thicker and thicker; and the heat exchange flow of the low-temperature coal economizer to the high-temperature flue gas is reduced.

Description

Technical Field

[0001] The invention relates to the field of low-temperature economizers, and in particular to a modular heat exchange unit structure of a wide-channel plate-type low-temperature economizer. Background Art

[0002] In low-temperature economizers, the main heat transfer method is convection heat transfer; when the hot fluid (usually the flue gas at the tail of the boiler) contacts the surface of the heat exchange tube bundle of the low-temperature economizer, due to the temperature difference between the flue gas and the wall of the tube bundle, the heat will be transferred from the flue gas to the wall of the tube bundle; during the flow of the flue gas, the molecules and particles inside it constantly collide with the wall of the tube bundle, transferring their own internal energy to the wall; the intensity of this convection heat transfer is related to factors such as the flow rate, temperature, geometric shape and arrangement of the flue gas; after the heat is transferred from the flue gas to the wall of the tube bundle, it will be conducted through the tube wall The medium (usually water or water vapor) inside the tube bundle is heated by the heat of the tube wall. The thermal conductivity of the tube wall has an important influence on this process. Generally, metal materials with high thermal conductivity (such as carbon steel, alloy steel, etc.) are used to make the tube bundle to ensure that heat can be effectively transferred from the wall to the medium. The temperature of the medium inside the tube bundle rises after absorbing heat. For water, it will absorb sensible heat and the water temperature will gradually rise. If it is a steam-water mixture, it will also involve the absorption of latent heat of vaporization to generate steam. The medium flows in the tube bundle, continuously taking away heat to maintain the continuous heat exchange process. During the heat exchange process of the low-temperature economizer, the particulate matter in the flue gas and the impurities in the liquid will enter the interior of the low-temperature economizer and adhere to the inner wall of the low-temperature economizer. Since the interior of the low-temperature economizer is in a closed state, with the increase of usage time, the dirt and impurities on the inner wall of the low-temperature economizer become thicker and thicker, reducing the flow rate of the low-temperature economizer for heat exchange with the high-temperature flue gas. Summary of the invention

[0003] The object of the present invention is to provide a wide-channel plate-type low-temperature economizer modular heat exchange unit structure to solve the defects mentioned in the above background technology.

[0004] To achieve the above-mentioned purpose, a wide-channel plate-type low-temperature economizer modular heat exchange unit structure is provided, including a low-temperature economizer body, a high-temperature flue gas inlet pipe and a medium inlet pipe are respectively installed on the top side of the low-temperature economizer body, and a high-temperature flue gas outlet pipe and a medium outlet pipe are respectively installed on the other side of the low-temperature economizer body, and a high-temperature flue gas filter assembly is fixedly installed on the high-temperature flue gas inlet pipe, and a medium filter assembly is fixedly installed on the medium inlet pipe, the high-temperature flue gas filter assembly includes an outlet pipe fixedly connected to the high-temperature flue gas inlet pipe through a flange, and a filter cartridge is fixedly arranged on the top of the outlet pipe, and an inlet pipe is fixedly installed on the top of the filter cartridge, a second filter disc is fixedly arranged in the middle of the interior of the filter cartridge, and a first filter disc is installed on the upper side of the second filter disc, and a third filter disc is installed on the lower side of the second filter disc.

[0005] Preferably, the high-temperature smoke filter assembly and the medium filter assembly are both cylindrically arranged, and are fixedly connected to each other via a connecting seat, and arc-shaped mounting seats are fixedly arranged at both ends of the connecting seat.

[0006] Preferably, multiple groups of medium channels and high-temperature flue gas channels are evenly arranged inside the low-temperature economizer body, and the medium channels are composed of two groups of heat exchange plates arranged in a wavy line shape. At the same time, the multiple groups of medium channels and high-temperature flue gas channels are arranged alternately.

[0007] Preferably, the first filter disc, the second filter disc and the third filter disc are all arranged in a circular shape, and the first filter disc, the second filter disc and the third filter disc are arranged in parallel.

[0008] Preferably, the first filter disc, the second filter disc and the third filter disc are arranged in layers from top to bottom inside the filter cartridge, and the distance between two adjacent groups of filter discs is consistent. At the same time, multiple groups of filter holes are evenly opened on the first filter disc, the second filter disc and the third filter disc.

[0009] Preferably, the diameter of the filter holes on the first filter disk is larger than the diameter of the filter holes on the second filter disk, and the diameter of the filter holes on the second filter disk is larger than the diameter of the filter holes on the third filter disk.

[0010] Preferably, both ends of the low-temperature economizer body are fixedly mounted with screw seats, and two sets of screw seats are provided with slots.

[0011] Preferably, the inner wall of the filter cartridge is provided with a cleaning mechanism, which includes a guide rail arranged along the axial direction of the filter cartridge, a cleaning brush being slidably connected to the guide rail, the cleaning brush being adapted to the inner wall of the filter cartridge, and the cleaning brush being connected to a driving assembly for driving it to move along the guide rail; through the setting of the cleaning mechanism, impurities that may be attached to the inner wall of the filter cartridge can be cleaned regularly.

[0012] Preferably, the outer shell of the low-temperature economizer body is made of thermal insulation material, and cooling fins are provided on the surface of the outer shell; the thermal insulation material can reduce the heat exchange between the low-temperature economizer body and the external environment, and improve the heat utilization rate; the cooling fins can effectively increase the heat dissipation area of ​​the outer shell of the low-temperature economizer body, and accelerate the heat dissipation when the equipment stops running or needs to be cooled quickly.

[0013] Preferably, flow regulating devices are provided at the inlet and outlet of the medium channel and the high-temperature flue gas channel; the flow regulating device can accurately control the flow of the medium and the high-temperature flue gas according to actual needs, so that the medium and the high-temperature flue gas maintain appropriate flow velocity and flow distribution in the channel, and optimize the heat exchange effect; when the equipment is started, stopped or the load changes, by adjusting the flow regulating device, it can quickly adapt to the changes in operating conditions, reduce the impact on the equipment caused by flow fluctuations, extend the service life of the equipment, and ensure that the low-temperature economizer body is always in a high-efficiency heat exchange state; a detachable ash box is provided at the bottom of the low-temperature economizer body, and the ash box is connected to the high-temperature flue gas channel inside the low-temperature economizer body; during the operation of the low-temperature economizer, dust and other particulate matter in the flue gas will fall into the ash box under the action of gravity, accumulate in the ash box, and affect the heat exchange efficiency and equipment operation safety; at the same time, the setting of the ash box helps to keep the inside of the low-temperature economizer body clean. Compared with the prior art, the beneficial effects of the present invention are as follows: the first filter disc, the second filter disc and the third filter disc are installed inside the high-temperature flue gas filter assembly and the medium filter assembly. The arrangement of the three sets of filter discs can filter the flue gas and liquid medium that are about to enter the low-temperature economizer body, and can filter the large particle impurities inside the flue gas and liquid medium, thereby preventing the large particle impurities inside the flue gas and liquid medium from adhering to the inner wall of the low-temperature economizer body, thereby ensuring the cleanliness of the interior of the low-temperature economizer body, and preventing the dirt and impurities on the inner wall of the low-temperature economizer from becoming thicker and thicker, thereby reducing the flow rate of the low-temperature economizer for heat exchange with the high-temperature flue gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a front view schematic diagram of the structure of the present invention; Figure 2 Based Figure 1 Bottom view of Figure 3 Based Figure 1 A top view of Figure 4 It is a schematic diagram of a high temperature flue gas filtration assembly; Figure 5 This is a schematic diagram of the medium channel and high-temperature flue gas channel inside the low-temperature economizer body; Figure 6 for Figure 5 Top view of the .

[0015] Numbers in the figure: 1. Low-temperature economizer body; 11. Medium channel; 12. High-temperature flue gas channel; 2. High-temperature flue gas inlet pipe; 3. Medium inlet pipe; 4. High-temperature flue gas filter assembly; 41. Filter cartridge; 42. Inlet pipe; 43. Outlet pipe; 44. First filter disc; 45. Second filter disc; 46. Third filter disc; 5. Medium filter assembly; 6. Connecting seat. DETAILED DESCRIPTION

[0016] See also Figure 1-6 The present invention provides a wide-channel plate-type low-temperature economizer modular heat exchange unit structure, including a low-temperature economizer body 1. The low-temperature economizer body 1 is the core part of the entire heat exchange unit, and multiple groups of medium channels 11 and high-temperature flue gas channels 12 are evenly arranged inside. The medium channel 11 is composed of two groups of heat exchange plates arranged in a wavy line shape. This unique shape design can effectively increase the heat exchange area and improve the heat exchange efficiency. Multiple groups of medium channels 11 and high-temperature flue gas channels 12 are arranged alternately to ensure sufficient heat exchange between the high-temperature flue gas and the medium. For example, during actual installation, the spacing between each group of medium channels 11 and the high-temperature flue gas channels 12 must be strictly controlled within a certain range to ensure that heat can be efficiently transferred from the high-temperature flue gas to the medium.

[0017] Both ends of the low-temperature economizer body 1 are fixedly installed with screw seats, and slots are opened on the screw seats. The design of these screw seats and slots is mainly used for connection with external equipment or pipelines to ensure the stable installation of the entire heat exchange unit in the system. During the installation process, use suitable bolts to pass through the slots to tightly connect the low-temperature economizer body 1 with upstream and downstream equipment. At the same time, the design of the slots also allows a certain degree of adjustment to meet the needs of different installation environments.

[0018] The outer shell of the low-temperature economizer body 1 is made of heat-insulating material, which can effectively reduce the heat exchange between the low-temperature economizer body 1 and the external environment and improve the heat utilization rate. Common heat-insulating materials such as rock wool, aluminum silicate fiber, etc., have heat-insulating properties that enable the heat inside the low-temperature economizer body 1 to be absorbed by the medium as much as possible, reducing heat loss. The surface of the outer shell is also provided with cooling fins. When the equipment stops running or needs to be cooled quickly, the cooling fins can effectively increase the heat dissipation area of ​​the outer shell of the low-temperature economizer body 1 and accelerate heat dissipation. The shape, size and spacing of the cooling fins are carefully designed.

[0019] The high-temperature flue gas inlet pipe 2 and the medium inlet pipe 3 are respectively installed on the top side of the low-temperature economizer body 1, and the high-temperature flue gas outlet pipe and the medium outlet pipe are installed on the other side of the low-temperature economizer body 1. When installing these pipes, it is necessary to ensure the sealing of the joints to prevent leakage of flue gas or medium. Sealing is usually carried out by welding, flange connection or sealing gaskets. For example, for the connection between the high-temperature flue gas inlet pipe 2 and the low-temperature economizer body 1, the pipe mouth is first precisely polished and aligned, and then argon arc welding is used for welding. After welding, non-destructive testing is performed to ensure the quality of the weld.

[0020] A high-temperature flue gas filter assembly 4 is fixedly installed on the high-temperature flue gas inlet pipe 2, and a medium filter assembly 5 is fixedly installed on the medium inlet pipe 3. The installation positions of these two filter assemblies are crucial, as they can filter the flue gas and the medium before they enter the low-temperature economizer body 1, remove impurities therein, and protect the cleanliness of the inside of the low-temperature economizer body 1. During installation, ensure that the filter assembly is firmly connected to the inlet pipe and is easy to disassemble and clean.

[0021] The high-temperature flue gas filter assembly 4 and the medium filter assembly 5 are both cylindrically arranged, and the two are fixedly connected by a connecting seat 6. Both ends of the connecting seat 6 are fixedly provided with arc-shaped mounting seats. This design not only ensures the stability of the high-temperature flue gas filter assembly 4 and the medium filter assembly 5 when connected, but also the arc-shaped mounting seats can better fit the pipe surface and reduce stress concentration at the connection. When installing the connecting seat 6, it is necessary to use a special tool to tighten it to ensure a tight connection, and pay attention to the installation direction so that the flue gas or medium can pass through the filter assembly smoothly.

[0022] The high-temperature flue gas filter assembly 4 includes an outlet pipe 43 fixedly connected to the high-temperature flue gas inlet pipe 2 through a flange, a filter cartridge 41 is fixedly arranged on the top of the outlet pipe 43, and an inlet pipe 42 is fixedly installed on the top of the filter cartridge 41. The flange connection method is convenient for disassembly and maintenance. When installing the flange, a suitable sealing gasket, such as a rubber asbestos gasket, should be used to ensure the sealing of the connection. At the same time, the flange bolts should be tightened according to the specified torque to prevent loosening.

[0023] How Filter Components Work A second filter disc 45 is fixedly arranged in the middle of the filter cartridge 41, a first filter disc 44 is installed on the upper side of the second filter disc 45, and a third filter disc 46 is installed on the lower side. The first filter disc 44, the second filter disc 45 and the third filter disc 46 are all arranged in a circular shape and are parallel to each other. They are arranged in layers from top to bottom inside the filter cartridge 41, and the distance between two adjacent groups of filter discs is consistent. This layered arrangement and uniform spacing design can make the smoke or medium pass through filter discs of different apertures in sequence when passing through the filter cartridge 41, so as to achieve step-by-step filtration.

[0024] A plurality of groups of filter holes are evenly formed on the first filter disc 44 , the second filter disc 45 and the third filter disc 46 . The diameter of the filter holes on the first filter disc 44 is larger than that on the second filter disc 45 , and the diameter of the filter holes on the second filter disc 45 is larger than that on the third filter disc 46 .

[0025] Taking the high-temperature flue gas filter assembly 4 as an example, the high-temperature flue gas enters the interior of the filter tube 41 from the inlet pipe 42 and first impacts the first filter disc 44. Since the diameter of the filter hole of the first filter disc 44 is relatively large, it can intercept larger particles of dust, particulate matter and other impurities, which will be blocked on the upper surface of the first filter disc 44. The flue gas that has been preliminarily filtered by the first filter disc 44 continues to flow downward and impacts the second filter disc 45. The filter hole diameter of the second filter disc 45 is smaller, which can further intercept medium-sized impurities, so that the flue gas can be further purified. Finally, the flue gas passes through the third filter disc 46. The smaller filter hole diameter of the third filter disc 46 can remove tiny impurity particles. After three filtrations, the high-temperature flue gas enters the high-temperature flue gas channel 12 of the low-temperature economizer body 1 for heat exchange.

[0026] The working principle of the medium filter assembly 5 is similar to that of the high-temperature flue gas filter assembly 4. It filters the medium entering the low-temperature economizer body 1 to prevent impurities in the medium from entering the medium channel 11, thereby ensuring the normal progress of the heat exchange process. At the same time, it also protects the heat exchange plates inside the medium channel 11 from wear and corrosion caused by impurities.

[0027] Cleaning agency maintenance The inner wall of the filter cartridge 41 is provided with a cleaning mechanism, which includes a guide rail arranged along the axial direction of the filter cartridge 41, and a cleaning brush is slidably connected to the guide rail, and the cleaning brush is adapted to the inner wall of the filter cartridge 41. The cleaning brush is connected to a driving component that drives it to move along the guide rail, and the driving component can be an electric motor, a pneumatic device, or a manual rocker, etc. After the equipment has been running for a period of time, the cleaning mechanism is started, and the driving component drives the cleaning brush to move up and down along the guide rail to clean the impurities that may be attached to the inner wall of the filter cartridge 41.

[0028] Regularly inspect and maintain the cleaning mechanism, check the wear of the cleaning brush, and replace the cleaning brush in time if the bristles are severely worn. At the same time, check the operating status of the drive components to ensure that they can work properly, such as checking the power connection of the electric motor, whether the motor speed is normal, and whether the air source pressure of the pneumatic device is stable.

[0029] Ash box and flow regulating device A removable ash box is provided at the bottom of the low-temperature economizer body 1, and the ash box is connected to the high-temperature flue gas channel 12 inside the low-temperature economizer body 1. During the operation of the low-temperature economizer, dust and other particulate matter in the flue gas will fall into the ash box under the action of gravity. The design of the ash box effectively prevents dust from accumulating in the low-temperature economizer body 1, affecting the heat exchange efficiency and the safety of equipment operation. For example, in a continuously operating industrial boiler system, after a period of operation, a certain amount of dust will be collected in the ash box, which needs to be cleaned regularly.

[0030] When cleaning the ash box, first stop the operation of the low-temperature economizer, then open the cover of the ash box or disassemble the ash box. Pour the collected dust into a special collection container and properly dispose of it to prevent dust from flying and polluting the environment. After cleaning, reinstall the ash box to ensure that it is tightly connected to the high-temperature flue gas channel 12 to prevent flue gas leakage.

[0031] Flow Control Device Operation Flow regulating devices are provided at the inlet and outlet of the medium channel 11 and the high-temperature flue gas channel 12. The flow regulating device can accurately control the flow of the medium and the high-temperature flue gas according to actual needs, so that the medium and the high-temperature flue gas maintain a suitable flow velocity and flow distribution in the channel to optimize the heat exchange effect. When the equipment is started, the flow regulating device is slowly opened to gradually increase the flow of the medium and the high-temperature flue gas to prevent the equipment from being impacted by a sudden increase in flow.

[0032] During the operation of the equipment, the flow regulating device is adjusted in time according to the load changes. When the load increases, the flow of the medium and high-temperature flue gas is appropriately increased to meet the heat exchange requirements; when the load decreases, the flow is reduced accordingly to avoid energy waste. At the same time, by adjusting the flow regulating device, the medium and high-temperature flue gas can form a good flow field distribution in the channel to improve the heat exchange efficiency. For example, by adjusting the valve opening of the flow regulating device, the high-temperature flue gas forms a uniform flow velocity distribution in the high-temperature flue gas channel 12, avoiding the situation where the local flow velocity is too fast or too slow, and ensuring that the heat can be fully transferred to the medium. When the equipment stops running, close the flow regulating device to prevent the medium or flue gas from flowing back.

Claims

1. A wide channel plate type low temperature economizer modular heat exchange unit structure, comprising a low temperature economizer body (1), characterized in that: A high-temperature flue gas inlet pipe (2) and a medium inlet pipe (3) are respectively installed on the top side of the low-temperature economizer body (1), and a high-temperature flue gas outlet pipe and a medium outlet pipe are respectively installed on the other side of the low-temperature economizer body (1). At the same time, a high-temperature flue gas filter assembly (4) is fixedly installed on the high-temperature flue gas inlet pipe (2), and a medium filter assembly (5) is fixedly installed on the medium inlet pipe (3). The high-temperature flue gas filter assembly (4) comprises an outlet pipe (43) fixedly connected to the high-temperature flue gas inlet pipe (2) via a flange, and a filter cartridge (41) is fixedly installed on the top of the outlet pipe (43), and an inlet pipe (42) is fixedly installed on the top of the filter cartridge (41). A second filter disc (45) is fixedly installed in the middle of the filter cartridge (41), and a first filter disc (44) is installed on the upper side of the second filter disc (45), and a third filter disc (46) is installed on the lower side of the second filter disc (45).

2. A wide channel plate type low temperature economizer modular heat exchange unit structure according to claim 1, characterized in that: The high-temperature smoke filter assembly (4) and the medium filter assembly (5) are both cylindrically arranged, and are fixedly connected to each other via a connecting seat (6), while arc-shaped mounting seats are fixedly arranged at both ends of the connecting seat (6).

3. The wide channel plate type low temperature economizer modular heat exchange unit structure according to claim 1, characterized in that: A plurality of groups of medium channels (11) and high-temperature flue gas channels (12) are evenly arranged inside the low-temperature economizer body (1), and the medium channels (11) are composed of two groups of heat exchange fins arranged in a wavy line shape, and the plurality of groups of medium channels (11) and high-temperature flue gas channels (12) are arranged alternately.

4. A wide channel plate type low temperature economizer modular heat exchange unit structure according to claim 1, characterized in that: The first filter disc (44), the second filter disc (45) and the third filter disc (46) are all arranged in a circular shape, and the first filter disc (44), the second filter disc (45) and the third filter disc (46) are arranged in parallel.

5. A wide channel plate type low temperature economizer modular heat exchange unit structure according to claim 4, characterized in that: The first filter disc (44), the second filter disc (45) and the third filter disc (46) are arranged in layers from top to bottom inside the filter cartridge (41), and the distance between two adjacent groups of filter discs is consistent. The first filter disc (44), the second filter disc (45) and the third filter disc (46) are evenly provided with a plurality of groups of filter holes.

6. A wide channel plate type low temperature economizer modular heat exchange unit structure according to claim 5, characterized in that: The diameter of the filter holes on the first filter disc (44) is greater than the diameter of the filter holes on the second filter disc (45), and the diameter of the filter holes on the second filter disc (45) is greater than the diameter of the filter holes on the third filter disc (46).

7. A wide channel plate type low temperature economizer modular heat exchange unit structure according to claim 1, characterized in that: Both ends of the low-temperature economizer body (1) are fixedly mounted with screw sockets, and both sets of screw sockets are provided with slotted holes.

8. A wide channel plate type low temperature economizer modular heat exchange unit structure according to claim 6, characterized in that: The inner wall of the filter cartridge (41) is provided with a cleaning mechanism, the cleaning mechanism comprising a guide rail arranged along the axial direction of the filter cartridge (41), a cleaning brush being slidably connected to the guide rail, the cleaning brush being adapted to the inner wall of the filter cartridge (41), and the cleaning brush being connected to a driving assembly for driving the cleaning brush to move along the guide rail; by providing the cleaning mechanism, impurities that may be attached to the inner wall of the filter cartridge (41) can be cleaned regularly.

9. A wide channel plate type low temperature economizer modular heat exchange unit structure according to claim 8, characterized in that: The outer shell of the low-temperature economizer body (1) is made of a heat-insulating material, and heat-dissipating fins are provided on the surface of the outer shell; the heat-insulating material can reduce the heat exchange between the low-temperature economizer body (1) and the external environment, thereby improving the heat utilization rate; the heat-dissipating fins can effectively increase the heat dissipation area of ​​the outer shell of the low-temperature economizer body (1), and can accelerate the heat dissipation when the equipment stops running or needs to be cooled quickly.

10. A wide channel plate type low temperature economizer modular heat exchange unit structure according to claim 9, characterized in that: The inlet and outlet of the medium channel (11) and the high-temperature flue gas channel (12) are both provided with flow regulating devices; the flow regulating devices can accurately control the flow of the medium and the high-temperature flue gas according to actual needs, so that the medium and the high-temperature flue gas maintain a suitable flow velocity and flow distribution in the channel, thereby optimizing the heat exchange effect; when the equipment is started, stopped or the load changes, by adjusting the flow regulating devices, it is possible to quickly adapt to the change in working conditions, reduce the impact of flow fluctuations on the equipment, extend the service life of the equipment, and ensure that the low-temperature economizer body (1) is always in a high-efficiency heat exchange state; a detachable ash box is provided at the bottom of the low-temperature economizer body (1), and the ash box is connected to the high-temperature flue gas channel (12) inside the low-temperature economizer body (1); During the operation of the low-temperature economizer, dust and other particulate matter in the flue gas will fall into the ash box under the action of gravity. The ash box (which is detachable) is convenient for regular cleaning of the collected dust, thereby preventing dust from accumulating in the low-temperature economizer body (1) and affecting the heat exchange efficiency and the safety of equipment operation. At the same time, the provision of the ash box helps to keep the interior of the low-temperature economizer body (1) clean.

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