A wear-resistant flue gas heat exchanger and adjustment method

Abstract

The present invention provides an anti-wear flue gas heat exchanger, comprising a plurality of groups of heat exchange pipes, a newly added header heat exchange pipe, a water inlet header, a water outlet header and an anti-wear dummy pipe; a plurality of groups of the heat exchange pipes are arranged between the water inlet header and the water outlet header, the newly added header heat exchange pipe is arranged on the side close to the water outlet header, and the anti-wear dummy pipe is arranged on the side close to the newly added header heat exchange pipe. The present invention also provides an adjustment method using the above-mentioned anti-wear flue gas heat exchanger. The present invention can make full use of the limited flue layout space, arrange as much heat exchange area as possible under the same budget, and reduce unnecessary waste. At the same time, the operating flexibility of the flue gas heat exchanger is improved, and in the case of local wear, the overall operation of the equipment is not interfered, thereby improving the reliability of the equipment.

Description

Technical Field

[0001] The invention relates to the technical field of low-temperature economizer flue gas heat exchangers, and in particular to a wear-resistant flue gas heat exchanger and an adjustment method thereof. Background Art

[0002] In common low-temperature economizer flue gas heat exchangers, the flue gas heat exchanger is composed of modules with similar array structures. After the flue gas flows into the flue gas heat exchanger, the dust carried by the flue gas is easy to wear the heat exchange tubes. Usually, 3-5 rows of anti-wear dummy tubes are set in the windward side module to prevent wear on the subsequent heat exchange tubes. These dummy tubes do not participate in heat exchange, but increase the overall weight of the equipment, wasting a certain amount of volume and processing and manufacturing costs. In addition, since the overall arrangement of the flue gas heat exchanger is tight, the entire module needs to be replaced uniformly when replacing it. For narrower installation locations, overall replacement will bring inconvenience. Summary of the invention

[0003] The object of the present invention is to provide a wear-resistant flue gas heat exchanger and an adjustment method, which can fully utilize the limited flue layout space by reducing the number of wear-resistant false pipes and increasing small headers, thereby improving the operating flexibility of the flue gas heat exchanger.

[0004] The present invention provides an anti-wear flue gas heat exchanger, comprising a plurality of groups of heat exchange pipes, newly added header heat exchange pipes, a water inlet header, a water outlet header and anti-wear dummy pipes; a plurality of groups of the heat exchange pipes are arranged between the water inlet header and the water outlet header, the newly added header heat exchange pipes are arranged on a side close to the water outlet header, and the anti-wear dummy pipes are arranged on a side close to the newly added header heat exchange pipes.

[0005] Furthermore, it also includes a first header, which is connected to the newly added header heat exchange pipeline and is arranged between the anti-wear dummy pipe and the water outlet header.

[0006] Furthermore, it also includes an inlet valve, which is arranged between the water outlet manifold and the first manifold.

[0007] Furthermore, it also includes a second header, which is connected to the newly added header heat exchange pipeline and is arranged between the anti-wear dummy pipe and the first header.

[0008] Furthermore, it also includes an outlet valve, which is arranged on the outlet side of the second header.

[0009] Furthermore, a first pressure measuring point is provided between the water outlet manifold and the inlet valve.

[0010] Furthermore, a second pressure measuring point is provided on a side of the outlet valve away from the second header.

[0011] Furthermore, a bypass valve is included, and the bypass valve is arranged between the inlet valve and the outlet valve.

[0012] The present invention also provides an adjustment method using the above flue gas heat exchanger, wherein a plurality of rows of anti-wear dummy pipes on the windward side are replaced with newly added heat exchange pipes, and only one row of anti-wear dummy pipes is retained, and a plurality of headers and corresponding valves and pressure measuring points are arranged at the same time; the plurality of headers are connected to the newly added heat exchange pipes, the valves are arranged at the inlet and outlet of the headers respectively, and the pressure measuring points are arranged at the inlet and outlet of the headers respectively;

[0013] During installation, adjust the water flow of the bypass valve pipeline branch to be consistent with the newly added heat exchange pipeline branch, and record the pressure value of the pressure measuring point. If the heat exchange pipeline is worn, close the valve corresponding to the header and adjust the bypass valve opening to make the pressure measuring point value consistent with the recorded value during normal operation to ensure the normal flow of the flue gas heat exchanger.

[0014] Furthermore, when the heat exchange pipe is worn, the newly added heat exchange pipe can be replaced without stopping the entire unit by switching to bypass in time.

[0015] Compared with the prior art, the beneficial effects of the wear-resistant flue gas heat exchanger of the present invention are: newly added heat exchange pipes replace the original several rows of anti-wear dummy pipes, and the anti-wear dummy pipes are reduced from several rows to one row, which can make full use of the limited flue layout space. Under the same budget, as much heat exchange area as possible can be arranged to reduce unnecessary waste.

[0016] Compared with the prior art, the beneficial effect of the adjustment method of the wear-resistant flue gas heat exchanger of the present invention is that by adding a header and a pressure measuring point, when the equipment does not discharge water normally, the pressure measuring point fluctuates greatly, or the flue wall drips, the newly added heat exchange pipe can be closed and replaced. The operation flexibility of the flue gas heat exchanger is improved, and in the case of local wear, the overall operation of the equipment is not disturbed, thereby improving the reliability of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 This is a schematic structural diagram of an anti-wear flue gas heat exchanger according to an embodiment of the present invention;

[0019] Figure 2 The present invention is a schematic diagram of heat exchange pipe connection of a wear-resistant flue gas heat exchanger according to an embodiment of the present invention.

[0020] Description of reference numerals:

[0021] 1: heat exchange pipeline; 2: water inlet manifold; 3: water outlet manifold; 4: anti-wear dummy pipe; 5: first manifold; 6: second manifold; 7: inlet valve; 8: outlet valve; 9: first pressure measuring point; 10: second pressure measuring point; 11: bypass valve; 12: newly added manifold heat exchange pipeline. DETAILED DESCRIPTION

[0022] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0024] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined. In addition, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] like Figure 1 and Figure 2As shown, the present invention provides an anti-wear flue gas heat exchanger, comprising a plurality of groups of heat exchange pipes 1, a newly added header heat exchange pipe 12, a water inlet header 2, a water outlet header 3 and anti-wear dummy pipes 4; a plurality of groups of heat exchange pipes 1 are arranged between the water inlet header 2 and the water outlet header 3, the newly added header heat exchange pipe 12 is arranged on the side close to the water outlet header 3, and the anti-wear dummy pipes 4 are arranged on the side close to the newly added header heat exchange pipe 12. Only one row of anti-wear dummy pipes 4 is required, and the newly added header heat exchange pipe 12 is used to replace the anti-wear dummy pipes 4 arranged in multiple rows in the prior art. In the prior art, the anti-wear dummy pipes 4 do not participate in heat exchange, and the design of multiple rows increases the overall weight of the equipment, which is wasteful. The design of the present invention with only one row of anti-wear dummy pipes 4 arranges the largest heat exchange area in a limited space, reducing unnecessary waste.

[0026] In a more preferred embodiment, it further comprises a first header 5 , which is connected to the newly added header heat exchange pipe 12 and is arranged between the anti-wear dummy pipe 4 and the water outlet header 3 .

[0027] In a more preferred embodiment, an inlet valve 7 is further included, and the inlet valve 7 is arranged between the water outlet header 3 and the first header 5. When the inlet valve 7 is opened, the first header 5 can participate in the heat exchange.

[0028] In a more preferred embodiment, it further includes a second header 6 , which is connected to the newly added header heat exchange pipe 12 and is arranged between the anti-wear dummy pipe 4 and the first header 5 .

[0029] In a more preferred embodiment, it further comprises an outlet valve 8 , which is arranged at the outlet side of the second header 6 .

[0030] In a more preferred embodiment, a first pressure measuring point 9 is provided between the water outlet manifold 3 and the inlet valve 7. The first pressure measuring point 9 is used to test the pressure value at the inlet valve 7.

[0031] In a more preferred embodiment, a second pressure measuring point 10 is provided on the side of the outlet valve 8 away from the second header 6 . The second pressure measuring point 10 is used to test the pressure value at the outlet valve 8 .

[0032] In a more preferred embodiment, a bypass valve 11 is further included, and the bypass valve 11 is arranged between the inlet valve 7 and the outlet valve 8. The function of the bypass valve 11 is to replace the functions of the inlet valve 7 and the outlet valve 8 at both ends of the newly added header heat exchange pipeline 12 when a fault occurs, so as to ensure the normal flow of the flue gas heat exchanger and the stable operation of the equipment.

[0033] The present invention also provides an adjustment method using the above-mentioned anti-wear flue gas heat exchanger, wherein a plurality of rows of anti-wear dummy tubes 4 on the windward side are replaced with newly added heat exchange pipes 12, and only one row of anti-wear dummy tubes 4 is retained, and a plurality of headers and corresponding valves and pressure measuring points are provided at the same time; the plurality of headers are connected to the newly added heat exchange pipes 12, the valves are respectively provided at the inlet and outlet of the headers, and the pressure measuring points are respectively provided at the inlet and outlet of the headers;

[0034] During installation, adjust the water flow of the bypass valve pipeline branch to be consistent with the newly added heat exchange pipeline 12 branch, and record the pressure value of the pressure measuring point. If the heat exchange pipeline 1 is worn, close the valve corresponding to the manifold and adjust the bypass valve opening to make the pressure measuring point value consistent with the recorded value during normal operation to ensure the normal flow of the flue gas heat exchanger.

[0035] In a more preferred embodiment, when the heat exchange pipe is worn, the newly added heat exchange pipe 12 can be replaced without shutting down the entire unit by switching to bypass in time.

[0036] Since the dust itself has weight, in the flowing flue gas, the dust concentration on the lower side of the flue is higher and the chance of wear is higher. The anti-wear part of the lower module of the flue can be further subdivided, and the first header 5 and the second header 6 can be split into smaller header modules, and corresponding pressure measuring points and valves can be added to facilitate the switching of heat exchange tubes in a small area.

[0037] Finally, it should be noted that 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 they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A wear-resistant flue gas heat exchanger, characterized in that: The invention comprises a plurality of groups of heat exchange pipes (1), a newly added header heat exchange pipe (12), a water inlet header (2), a water outlet header (3), an anti-wear dummy pipe (4), a first header (5), a second header (6), an inlet valve (7), an outlet valve (8) and a bypass valve (11); a plurality of groups of the heat exchange pipes (1) are arranged between the water inlet header (2) and the water outlet header (3), the newly added header heat exchange pipe (12) is arranged on a side close to the water outlet header (3), the anti-wear dummy pipe (4) is arranged on a side close to the newly added header heat exchange pipe (12), and the anti-wear dummy pipe (4) is arranged in only one row; The first header (5) is connected to the newly added header heat exchange pipeline (12) and is arranged between the anti-wear dummy pipe (4) and the water outlet header (3); the inlet valve (7) is arranged between the water outlet header (3) and the first header (5); the second header (6) is connected to the newly added header heat exchange pipeline (12) and is arranged between the anti-wear dummy pipe (4) and the first header (5); the outlet valve (8) is arranged at the outlet side of the second header (6); a first pressure measuring point (9) is added between the water outlet header (3) and the inlet valve (7); a second pressure measuring point (10) is added on the side of the outlet valve (8) away from the second header (6); and the bypass valve (11) is arranged between the inlet valve (7) and the outlet valve (8).

2. A method for adjusting the wear-resistant flue gas heat exchanger according to claim 1, characterized in that: Several rows of anti-wear dummy pipes on the windward side are replaced with newly added heat exchange pipes, and only one row of anti-wear dummy pipes is retained. Meanwhile, several headers and corresponding valves and pressure measuring points are set; several headers are connected to the newly added heat exchange pipes, and valves are respectively set at the inlet and outlet of the headers, and pressure measuring points are respectively set at the inlet and outlet of the headers; During installation, adjust the water flow of the bypass valve pipeline branch to be consistent with the newly added heat exchange pipeline branch, and record the pressure value of the pressure measuring point. If the heat exchange pipeline is worn, close the valve corresponding to the header and adjust the bypass valve opening to make the pressure measuring point value consistent with the recorded value during normal operation to ensure the normal flow of the flue gas heat exchanger.

3. The method for adjusting a wear-resistant flue gas heat exchanger according to claim 2, characterized in that: When the heat exchange pipe is worn, the bypass can be switched in time to replace the newly added heat exchange pipe without stopping the whole unit.

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