Horizontal type waste incineration waste heat boiler economizer double-flow-path arrangement structure

Abstract

The utility model discloses a double-flow arrangement structure of a horizontal waste incineration waste heat boiler economizer. The double-flow arrangement structure of the economizer comprises an economizer inlet collecting box, an economizer outlet collecting box, an economizer middle collecting box, an economizer coiled pipe set, a downstream connecting pipe and a countercurrent connecting pipe. The utility model solves the problems of poor heat exchange effect and high exhaust gas temperature caused by lower flow velocity of the working medium of the economizer, and changes the flow direction of the working medium of the economizer by adding the header blocking plate, the downstream connecting pipe and the countercurrent connecting pipe, so that the circulation sectional area of the economizer is reduced by half, and the flow velocity of the working medium is doubled. The heat absorption effect of the coal economizer is improved and the smoke exhaust temperature is reduced due to proper high working medium flow speed. And the service life of the economizer is prolonged, and the economic benefit of boiler operation is also improved.

Description

Technical Field

[0001] The utility model relates to the technical field of economizer layout structures, and particularly relates to a double-flow layout structure of a horizontal waste incineration waste heat boiler economizer. Background Art

[0002] Some horizontal waste incinerator waste heat boilers are restricted by the site, and it is required to shorten the length as much as possible in the length direction. Generally, the common way is to reduce the number of longitudinal serpentine tube rows of the economizer, so as to shorten the length of the economizer flue. However, in order to ensure the quantity of the heating surface area, it is necessary to widen the flue or reduce the transverse pitch of the economizer serpentine tubes and increase the number of transverse rows of the economizer serpentine tubes. In this way, the working medium flow cross-section of the economizer will be increased, resulting in the working medium flow velocity of the economizer being reduced to less than 0.25 m / s. If the working medium flow velocity of the economizer is too low, it will affect the heat absorption effect of the economizer, thereby increasing the exhaust gas temperature and decreasing the boiler thermal efficiency. Summary of the Utility Model

[0003] The purpose of the utility model is to solve the technical problems existing in the prior art, and provide a double-flow layout structure of a horizontal waste incineration waste heat boiler economizer.

[0004] To achieve the above purpose, the technical solution provided by the utility model is: a double-flow layout structure of a horizontal waste incineration waste heat boiler economizer, the double-flow layout structure of the economizer includes an economizer inlet header, an economizer outlet header, an economizer intermediate header, an economizer serpentine tube group, a downflow connecting pipe, and an upflow connecting pipe; the economizer inlet header is connected to the economizer intermediate header through the upflow connecting pipe; both sides of the economizer intermediate header are connected to the middle of the economizer intermediate header through the downflow connecting pipe; the economizer intermediate header is connected to the economizer outlet header through the upflow connecting pipe.

[0005] Preferably, header blanking plates are arranged at the openings of the economizer inlet header, the economizer outlet header, and the economizer intermediate header.

[0006] Preferably, the header blanking plate divides the heating surface of a single group of economizer serpentine tube groups into three groups of serpentine tube heating surfaces, with two sides being one flow and the middle being one flow.

[0007] Preferably, the header blanking plate, the downflow connecting pipe, and the upflow connecting pipe change the flow direction of the economizer working medium, reducing the working medium flow cross-section of the economizer by half and doubling the working medium flow velocity.

[0008] Preferably, the boiler feed water flow: The boiler feed water enters from both sides of the inlet header of the economizer, is heated by the heating surfaces of the serpentine tubes on both sides of the serpentine tube group of the economizer, and then enters the middle of the inlet header of the economizer through the countercurrent connecting pipe in a countercurrent manner; The boiler feed water flows from the middle of the inlet header of the economizer to the heating surfaces of the serpentine tubes in the middle of the serpentine tube group of the economizer, and then enters the middle of the first intermediate header of the economizer; The boiler feed water enters from the middle of the first intermediate header of the economizer into both sides of the second intermediate header of the economizer through the downstream connecting pipe; The boiler feed water enters from both sides of the second intermediate header of the economizer, is heated by the heating surfaces of the serpentine tubes on both sides of the serpentine tube group of the economizer, and then enters the middle of the second intermediate header of the economizer through the countercurrent connecting pipe in a countercurrent manner; The boiler feed water flows from the middle of the second intermediate header of the economizer to the heating surfaces of the serpentine tubes in the middle of the serpentine tube group of the economizer, and then enters the middle of the outlet header of the economizer, and finally flows out through the outlet header of the economizer;

[0009] Advantages of the present utility model:

[0010] 1. By adding header blind plates, downstream connecting pipes, and countercurrent connecting pipes, the present utility model changes the flow direction of the working medium in the economizer, reducing the flow cross-sectional area of the economizer by half, thereby doubling the flow velocity of the working medium. The higher flow velocity of the working medium increases the heat absorption effect of the economizer, reduces the flue gas temperature, improves the overall thermal efficiency of the boiler, extends the service life of the economizer, and also improves the economic benefits of boiler operation, solving the problems of poor heat transfer effect and high flue gas temperature caused by the low flow velocity of the working medium in the economizer.

[0011] 2. The double-flow layout structure of the economizer of the present utility model helps to shorten the length of the economizer, is beneficial to the layout of the scheme with limited space, has a compact structure, saves the investment cost of the construction party, and is simple, stable and practical in structure. It can be realized only by adding header blind plates and the corresponding downstream connecting pipes and countercurrent connecting pipes, and has extremely strong operability. Description of the Drawings

[0012] The drawings described herein are used to provide a further understanding of the present utility model, and constitute a part of the present utility model. The schematic embodiments of the present utility model and their descriptions are used to explain the present utility model and do not constitute an improper limitation to the present utility model.

[0013] Figure 1 is the overall structural schematic diagram of the present utility model;

[0014] Figure 2 is the cross-section along the A-A direction of the present utility model.

[0015] Reference Numerals in the Drawings:

[0016] 1. Heating surface of serpentine tube, 2. Inlet header of economizer, 3. Outlet header of economizer, 4. Intermediate header of economizer, 5. Header blind plate, 6. Downstream connecting pipe, 7. Countercurrent connecting pipe. Detailed implementation manners

[0017] This part will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the drawings. The function of the drawings is to supplement the description in the text part of the specification, enabling people to intuitively and vividly understand each technical feature and the overall technical solution of the present utility model. However, it should not be construed as a limitation on the protection scope of the present utility model.

[0018] In the description of the present utility model, it should be understood that for the orientation description, such as the upper, lower, front, rear, left, right, etc., the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on the present utility model.

[0019] In the description of the present utility model, the meaning of "several" is one or more, the meaning of "multiple" is two or more. Understandings such as "greater than", "less than", "exceeding", etc. do not include the recited number, and understandings such as "above", "below", "within", etc. include the recited number. If there is a description of "first" and "second", it is only for the purpose of distinguishing technical features and cannot be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0020] In the description of the present utility model, unless otherwise clearly defined, terms such as "set", "install", "connect", etc. should be understood in a broad sense. Those skilled in the art can reasonably determine the specific meanings of the above terms in the present utility model in combination with the specific content of the technical solution.

[0021] Referring to Figure 1 - Figure 2 , a preferred embodiment of the present utility model, a double - flow layout structure of a economizer for a horizontal waste incineration waste heat boiler. The double - flow layout structure of the economizer includes an economizer inlet header 2, an economizer outlet header 3, an economizer intermediate header 4, an economizer serpentine tube group, a parallel - flow connecting pipe 6, and a counter - flow connecting pipe 7. The economizer inlet header 2 is connected to the economizer intermediate header 4 through the counter - flow connecting pipe 7. The two sides of the economizer intermediate header 4 are connected to the middle of the economizer intermediate header 4 through the parallel - flow connecting pipe 6. The economizer intermediate header 4 is connected to the economizer outlet header 3 through the counter - flow connecting pipe 7.

[0022] Furthermore, header plugs 5 are provided at the openings of the economizer inlet header 2, the economizer outlet header 3, and the economizer intermediate header 4. The header plugs 5, the parallel - flow connecting pipe 6, and the counter - flow connecting pipe 7 change the flow direction of the economizer working medium, reducing the flow cross - section of the economizer working medium by half and doubling the working medium flow velocity.

[0023] Furthermore, the header blind flange 5 divides the heating surface of a single group of economizer serpentine tube bundles into three groups of serpentine tube heating surfaces 1, with one process on each side and one process in the middle.

[0024] Specifically, the feed water first passes through the serpentine tube heating surface 1 in the flue gas dispersion areas on both sides and then through the serpentine tube heating surface 1 in the middle flue gas concentration area; the double-pass structure of the economizer is compact. Even in the case of a large number of transverse tube rows, it can still ensure the working medium flow rate of the economizer to guarantee the heat absorption effect of the economizer; the structure is simple, stable and practical, and can be achieved only by adding the header blind flange 5 and the corresponding connecting pipes, with extremely strong operability.

[0025] The boiler feed water flow process is as follows: The boiler feed water passes through the serpentine tube heating surfaces 1 on both sides of the economizer serpentine tube bundle from both sides of the economizer inlet header 2, is heated, and then flows reversely into the middle of the economizer inlet header 2 through the reverse connecting pipe 7; the boiler feed water flows from the middle of the economizer inlet header 2 to the serpentine tube heating surface 1 in the middle of the middle economizer serpentine tube bundle, and then enters the middle of the first economizer intermediate header 4; the boiler feed water enters both sides of the second economizer intermediate header 4 from the middle of the first economizer intermediate header 4 through the forward connecting pipe 6; the boiler feed water passes through the serpentine tube heating surfaces 1 on both sides of the economizer serpentine tube bundle from both sides of the second economizer intermediate header 4, is heated, and then flows reversely into the middle of the second economizer intermediate header through the reverse connecting pipe 7; the boiler feed water flows from the middle of the second economizer intermediate header 4 to the serpentine tube heating surface 1 in the middle of the middle economizer serpentine tube bundle, and then enters the middle of the economizer outlet header 3, and finally flows out through the economizer outlet header 3.

[0026] The utility model changes the flow direction of the working medium in the economizer by adding the header blind flange 5, the forward connecting pipe 6 and the reverse connecting pipe 7, reducing the flow cross-sectional area of the economizer by half, so that the flow rate of the working medium doubles. The higher flow rate of the working medium increases the heat absorption effect of the economizer, reduces the flue gas temperature, improves the overall thermal efficiency of the boiler, prolongs the service life of the economizer, and also improves the economic benefits of boiler operation, solving the problems of poor heat transfer effect and high flue gas temperature caused by the low flow rate of the working medium in the economizer.

[0027] Secondly, the double-pass layout structure of the economizer of the utility model helps to shorten the length direction of the economizer, is beneficial to the layout of the scheme with limited space, is compact in structure, saves the investment cost of the construction party, and is simple, stable and practical in structure, and can be achieved only by adding the header blind flange 5 and the corresponding forward connecting pipe 6 and reverse connecting pipe 7, with extremely strong operability.

[0028] On the premise of no conflict, those skilled in the art can freely combine and superimpose the above additional technical features.

[0029] The above are only the preferred embodiments of the present utility model, and all technical solutions that achieve the purpose of the present utility model by substantially the same means fall within the protection scope of the present utility model.

Claims

1. A horizontal waste incineration waste heat boiler economizer dual-flow arrangement structure, characterized in that: The dual-flow arrangement structure of the economizer includes an economizer inlet header, an economizer outlet header, two economizer intermediate headers, an economizer serpentine tube group, a downstream connecting pipe, and a reverse connecting pipe; The economizer inlet header is connected to the first economizer intermediate header through a countercurrent connecting pipe; the two sides of the first economizer intermediate header are connected to the middle of the second economizer intermediate header through a downstream connecting pipe; the second economizer intermediate header is connected to the economizer outlet header through a countercurrent connecting pipe.

2. According to claim 1, a horizontal waste incineration waste heat boiler economizer dual-flow arrangement structure is characterized by: The openings of the economizer inlet header, economizer outlet header and economizer intermediate header are all provided with header blocking plates.

3. According to claim 2, a horizontal waste incineration waste heat boiler economizer dual-flow arrangement structure is characterized by: The header plugging plate divides the heating surface of a single economizer serpentine tube group into three groups of serpentine tube heating surfaces, with one flow path on the two sides and one flow path in the middle.

4. A horizontal waste incineration waste heat boiler economizer dual-flow arrangement structure according to claim 3, characterized in that: The header plugging plate, downstream connecting pipe and countercurrent connecting pipe change the flow direction of the economizer working medium, reduce the flow cross-section of the economizer working medium by half, and increase the working medium flow rate by half.

5. The horizontal waste incineration waste heat boiler economizer dual-flow arrangement structure according to claim 4, characterized in that: Boiler feed water process: Boiler feed water enters from both sides of the economizer inlet header, is heated by the serpentine tube heating surfaces on both sides of the economizer serpentine tube group, and then flows back through the countercurrent connecting pipe to enter the middle of the economizer inlet header; Boiler feed water flows from the middle of the economizer inlet header to the serpentine tube heating surface in the middle of the economizer serpentine tube group to be heated, and then enters the middle of the first economizer intermediate header; Boiler feed water enters from the middle of the first economizer intermediate header to both sides of the second economizer intermediate header through the downstream connecting pipe; Boiler feed water enters from both sides of the second economizer intermediate header, is heated by the serpentine tube heating surfaces on both sides of the economizer serpentine tube group, and then flows back through the countercurrent connecting pipe to enter the middle of the second economizer intermediate header; Boiler feed water flows from the middle of the second economizer intermediate header to the serpentine tube heating surface in the middle of the economizer serpentine tube group to be heated, and then enters the middle of the economizer outlet header, and finally flows out through the economizer outlet header.

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