Pi-shaped boiler high over-high and low-temperature heating surface composite arrangement structure

Abstract

The utility model discloses a Pi-shaped boiler high overhigh and low temperature heating surface composite arrangement structure. Relates to the boiler field. An existing pulverized coal boiler or an oil and gas fired boiler is arranged in a pi shape, and for an expanded boiler of a power plant or a chemical plant, the boiler arrangement structure needs to be compact due to the fact that the expanded boiler is limited by the occupied area in the plant. The left high-temperature superheater low-temperature section, the right high-temperature superheater low-temperature section and the high-temperature superheater high-temperature section are connected, and the left high-temperature superheater low-temperature section, the right high-temperature superheater low-temperature section and the high-temperature superheater high-temperature section are arranged side by side in a combined mode. The furnace is arranged side by side along the furnace width direction. The left high-temperature superheater low-temperature section and the right high-temperature superheater low-temperature section are arranged in relative low-temperature smoke areas close to boiler walls on the two sides in the width direction of the hearth, and the high-temperature superheater high-temperature section is arranged in the middle in the width direction of the hearth. The utility model is applied to the field of boiler heating surfaces.

Description

Technical Field

[0001] This utility model relates to the field of boilers, specifically to a composite arrangement structure of high and low temperature heating surfaces in a π-type boiler. Background Technology

[0002] The most common boiler layout for pulverized coal, oil, or gas-fired boilers is the π-type arrangement, a widely used layout for thermal power plant boilers. In this layout, the furnace is a vertical column and serves as the fuel combustion zone. Here, fuel mixes with air and burns, releasing heat to evaporate water into steam. A horizontal flue connects to the furnace outlet and is located above the furnace, housing superheaters and other heating surfaces to further heat the steam. A vertical flue connects perpendicularly to the horizontal flue and houses economizers, air preheaters, and other components to preheat the water and air entering the boiler, improving energy efficiency.

[0003] Pulverized coal boilers or oil / gas-fired boilers are typically arranged in a π-type configuration. The vertical furnace facilitates complete fuel combustion, while the horizontal and vertical flues allow for the rational arrangement of different heat exchange surfaces based on the temperature characteristics of steam and flue gas, meeting varying heat exchange requirements. The flue gas flows upwards through the furnace and exits via the horizontal and vertical flues, minimizing changes in flow direction, reducing resistance, and lowering fan energy consumption.

[0004] However, the π-type layout of pulverized coal boilers or oil / gas-fired boilers has the following drawbacks: large footprint, extended horizontal and vertical flues, and the need to reserve sufficient maintenance space, resulting in high site area requirements. For boiler expansions in power plants or chemical plants, due to the limited space available within the plant, a compact boiler layout is required. Utility Model Content

[0005] This utility model addresses the problem that existing pulverized coal boilers or oil / gas-fired boilers with a π-type layout require a compact boiler arrangement for expansion boilers in power plants or chemical plants due to space constraints. Therefore, it provides a π-type boiler with a composite arrangement of high and low temperature heating surfaces.

[0006] The technical solution of this utility model is:

[0007] A composite arrangement structure of high and low temperature heating surfaces in a π-type boiler includes a high-temperature superheater comprising a left high-temperature superheater low-temperature section, a right high-temperature superheater low-temperature section, and a high-temperature superheater high-temperature section. These sections are connected by a header and are arranged in a composite parallel configuration. The left and right high-temperature superheater low-temperature sections are located on either side, with the high-temperature superheater high-temperature section in the middle. The left and right high-temperature superheater low-temperature sections flow counter-currently, while the high-temperature superheater high-temperature section flows concurrently and is arranged side-by-side along the boiler width.

[0008] The low-temperature section of the left high-temperature superheater and the low-temperature section of the right high-temperature superheater are arranged in relatively low-temperature flue gas zones close to the furnace walls on both sides along the width of the furnace, and the high-temperature section of the high-temperature superheater is arranged in the middle position along the width of the furnace.

[0009] Furthermore, the low-temperature section of the left high-temperature superheater and the low-temperature section of the right high-temperature superheater are specifically arranged at positions close to the left and right water-cooled walls along the width of the boiler.

[0010] The low-temperature section of the left high-temperature superheater and the low-temperature section of the right high-temperature superheater are respectively connected to the left inlet header and the right inlet header, and the inlet headers of the low-temperature section of the left high-temperature superheater and the low-temperature section of the right high-temperature superheater are two independent inlet headers.

[0011] Furthermore, the low-temperature section of the left high-temperature superheater and the low-temperature section of the right high-temperature superheater are suspended in the upper flue of the furnace. The lower part of the low-temperature section of the left high-temperature superheater and the low-temperature section of the right high-temperature superheater are water-cooled membrane walls, and the upper part is divided into the furnace heating surface and the furnace exterior by the center line of the roof tube.

[0012] Furthermore, the outlets of the low-temperature section of the left high-temperature superheater and the low-temperature section of the right high-temperature superheater are the left outlet header and the right outlet header, respectively.

[0013] The left and right outlet headers are respectively equipped with a left superheater desuperheater and a right superheater desuperheater.

[0014] Furthermore, the high-temperature section of the high-temperature superheater is respectively connected to a first high-temperature section inlet header and a second high-temperature section inlet header;

[0015] The first high-temperature section inlet header and the left-side outlet header are a single header of continuous length;

[0016] The second high-temperature section inlet header and the right-side outlet header are a single, continuous header.

[0017] Furthermore, the left outlet header, the right outlet header, the left superheater desuperheater, the right superheater desuperheater, the first high-temperature section inlet header, and the second high-temperature section inlet header are integrated into one structure.

[0018] Furthermore, the high-temperature section of the high-temperature superheater is connected to the outlet header of the high-temperature section of the high-temperature superheater, and the outlet header 12 of the high-temperature section of the high-temperature superheater is a single header.

[0019] Furthermore, the low-temperature section of the left high-temperature superheater and the low-temperature section of the right high-temperature superheater are arranged in a counter-current manner inside the furnace.

[0020] Furthermore, the high-temperature section of the high-temperature superheater is arranged in a co-current manner within the furnace.

[0021] Compared with the prior art, the present invention has the following advantages:

[0022] This utility model is applicable to the suspended high-temperature superheater of π-type boiler. It adopts a composite arrangement structure of high and low temperature heating surfaces and desuperheaters, which makes full use of the heat transfer temperature difference to improve heat transfer efficiency. The desuperheaters are reasonably arranged and the desuperheaters are designed and arranged together with the header, which is conducive to the hanging design, saves steel consumption, and reduces the space in the depth direction of the boiler.

[0023] This invention relates to a π-type boiler with a suspended high-temperature superheater. To efficiently utilize the heat transfer difference and improve heat transfer efficiency, while also reducing boiler space and saving steel, a composite arrangement of high and low temperature heating surfaces is designed. The high-temperature superheater is designed as a composite structure consisting of a low-temperature section and a high-temperature section. The low-temperature section is located in the relatively low-temperature flue gas zone near the two side walls along the furnace width, while the high-temperature section is located in the middle along the furnace width, where the flue gas temperature is relatively high. The low-temperature section of the high-temperature superheater adopts a counter-current arrangement, while the high-temperature section adopts a co-current arrangement. This fully utilizes the heat transfer temperature difference in the low-temperature section to improve heat transfer efficiency. The high-temperature section, with its lower working fluid temperature at the inlet, is located in the high-temperature flue gas region, while the high-temperature working fluid temperature at the outlet is located in the lower-temperature flue gas region. This allows for reasonable control of the tube wall temperature, reduces the amount of material used in the high-end heating surfaces, and increases the economic efficiency of the power plant. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the arrangement structure of the low-temperature section of the high-temperature superheater of this utility model;

[0025] Figure 2 This is a schematic diagram showing the connection between the low-temperature section and the inlet header of the high-temperature superheater of this utility model;

[0026] Figure 3 yes Figure 1 The left view;

[0027] Figure 4 This is a schematic diagram of the high-temperature section arrangement structure of the high-temperature superheater of this utility model;

[0028] Figure 5 This is a schematic diagram showing the connection between the high-temperature section of the high-temperature superheater and the outlet header of the high-temperature section of the high-temperature superheater of this utility model.

[0029] Figure 6 yes Figure 4 The left view;

[0030] Figure 7 This is a schematic diagram of the superheater desuperheater arrangement on the left side;

[0031] Figure 8 yes Figure 7 The left view;

[0032] Figure 9 This is a schematic diagram of the superheater desuperheater arrangement on the right side;

[0033] Figure 10 yes Figure 9 The left view;

[0034] In the diagram: 1. Low-temperature section of the left high-temperature superheater; 2. Low-temperature section of the right high-temperature superheater; 3. Left inlet header; 4. Right inlet header; 5. Left outlet header; 6. Right outlet header; 7. Left superheater desuperheater; 8. Right superheater desuperheater; 9. First high-temperature section inlet header; 10. Second high-temperature section inlet header; 11. High-temperature section of the high-temperature superheater; 12. High-temperature section outlet header of the high-temperature superheater; 13. Right water-cooled wall; 14. Left water-cooled wall; 15. Centerline of the roof tubes. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate this utility model, but are not intended to limit the scope of this utility model.

[0036] Specific implementation method one: Combining Figure 1 — Figure 3This embodiment describes a composite arrangement structure of high and low temperature heating surfaces in a π-type boiler. The structure includes a high-temperature superheater comprising a left high-temperature superheater low-temperature section 1, a right high-temperature superheater low-temperature section 2, and a high-temperature superheater high-temperature section 11. These sections are connected and arranged in a composite, parallel configuration along the boiler width.

[0037] The low-temperature section 1 of the left high-temperature superheater and the low-temperature section 2 of the right high-temperature superheater are arranged in relatively low-temperature flue gas zones close to the furnace walls on both sides along the width of the furnace, and the high-temperature section 11 of the high-temperature superheater is arranged in the middle position along the width of the furnace.

[0038] The high-temperature superheater low-temperature section 1 on the left, the high-temperature superheater low-temperature section 2 on the right, and the high-temperature superheater high-temperature section 11 are arranged in a compound parallel configuration along the furnace width. This configuration is suitable for π-type boilers with suspended high-temperature superheaters. It adopts a compound arrangement structure of high and low temperature heating surfaces and desuperheaters to fully utilize the heat transfer temperature difference and improve heat transfer efficiency.

[0039] The high-temperature superheater is designed as a composite arrangement of a low-temperature section and a high-temperature section. The low-temperature section is located in the relatively low-temperature flue gas zone close to the two furnace walls along the width of the furnace, while the high-temperature section is located in the middle position along the width of the furnace, where the flue gas temperature is relatively high.

[0040] Specific Implementation Method Two: Combining Figure 1 — Figure 10 This embodiment describes a composite arrangement structure of high and low temperature heating surfaces for a π-type boiler. Specifically, the low temperature section 1 of the left high temperature superheater and the low temperature section 2 of the right high temperature superheater are arranged at positions close to the left water-cooled wall 14 and the right water-cooled wall 13 along the boiler width direction.

[0041] The low-temperature section 1 of the left high-temperature superheater and the low-temperature section 2 of the right high-temperature superheater are respectively connected to the left inlet header 3 and the right inlet header 4, and the inlet headers of the low-temperature section 1 of the left high-temperature superheater and the low-temperature section 2 of the right high-temperature superheater are two independent inlet headers.

[0042] The low-temperature section 1 of the left high-temperature superheater and the low-temperature section 2 of the right high-temperature superheater are specifically arranged on the left water-cooled wall 14 and the right water-cooled wall 13, which are close to both sides along the width of the boiler. For π-type boilers, the suspended high-temperature superheater is designed to make efficient use of the heat transfer difference, improve heat transfer efficiency, and reduce the space occupied by the boiler, save steel consumption, and improve the composite arrangement structure of the high and low temperature heating surfaces of the high-temperature superheater.

[0043] Specific implementation method three: Combining Figure 1 — Figure 3 This embodiment describes a composite arrangement structure of high and low temperature heating surfaces in a π-type boiler. The low temperature section 1 of the left high temperature superheater and the low temperature section 2 of the right high temperature superheater are suspended in the upper flue of the furnace. The lower part of the low temperature section 1 of the left high temperature superheater and the low temperature section 2 of the right high temperature superheater are water-cooled membrane walls, and the upper part is divided into the internal heating surface and the external heating surface by the center line 15 of the roof tube.

[0044] Specific implementation method four: Combination Figure 1 — Figure 3 This embodiment describes a composite arrangement structure of high and low temperature heating surfaces in a π-type boiler. The outlets of the low temperature section 1 of the left high temperature superheater and the low temperature section 2 of the right high temperature superheater are the left outlet header 5 and the right outlet header 6.

[0045] The left outlet header 5 and the right outlet header 6 are respectively equipped with a left superheater desuperheater 7 and a right superheater desuperheater 8.

[0046] The left outlet header 5 and the right outlet header 6 are respectively arranged with the left superheater desuperheater 7 and the right superheater desuperheater 8. The left superheater desuperheater 7 and the right superheater desuperheater 8 are arranged together with the header design, which is conducive to the hanging design, saves steel consumption, and reduces the space in the depth direction of the boiler.

[0047] Specific Implementation Method Five: Combining Figure 4 — Figure 6 This embodiment describes a composite arrangement structure of high and low temperature heating surfaces in a π-type boiler. The high temperature section 11 of the high temperature superheater is connected to a first high temperature section inlet header 9 and a second high temperature section inlet header 10, respectively.

[0048] The first high-temperature section inlet header 9 and the left outlet header 5 are a single header of the same length;

[0049] The second high-temperature section inlet header 10 and the right-side outlet header 6 are a single header of the same length.

[0050] The above-mentioned structure integrates the outlet header of the low-temperature section of the high-temperature superheater, the desuperheater, and the inlet header of the high-temperature section of the high-temperature superheater into one unit, saving space for boiler header and desuperheater piping. At the same time, the integrated structure design facilitates the hanging design and greatly reduces the depth dimension of the furnace.

[0051] Specific Implementation Method Six: Combination Figure 1 — Figure 10This embodiment describes a composite arrangement structure of high and low temperature heating surfaces in a π-type boiler. The left outlet header 5, right outlet header 6, left superheater desuperheater 7, right superheater desuperheater 8, first high-temperature section inlet header 9, and second high-temperature section inlet header 10 are integrated into a single structure. This saves space for boiler header and desuperheater piping arrangements. Furthermore, the integrated structure design facilitates hanging design and significantly reduces the depth dimension of the furnace.

[0052] Specific implementation method seven: Combination Figure 1 — Figure 3 This embodiment describes a composite arrangement structure of high and low temperature heating surfaces in a π-type boiler, wherein the low temperature section 1 of the left high temperature superheater and the low temperature section 2 of the right high temperature superheater are arranged in a counter-current manner inside the furnace.

[0053] The low-temperature section 1 of the left high-temperature superheater and the low-temperature section 2 of the right high-temperature superheater are arranged in a counter-current manner in the furnace, while the high-temperature section 11 of the high-temperature superheater is arranged in a co-current manner, which makes full use of the heat transfer temperature difference of the low-temperature section of the high-temperature superheater and improves the heat transfer efficiency.

[0054] Specific implementation method eight: Combination Figure 1 — Figure 10 This embodiment describes a composite arrangement structure of high and low temperature heating surfaces in a π-type boiler, wherein the high temperature section 11 of the high temperature superheater is arranged in a co-current manner within the furnace.

[0055] The low-temperature section 1 of the left high-temperature superheater and the low-temperature section 2 of the right high-temperature superheater are arranged in a counter-current manner in the furnace, while the high-temperature section 11 of the high-temperature superheater is arranged in a co-current manner, which makes full use of the heat transfer temperature difference of the low-temperature section of the high-temperature superheater and improves the heat transfer efficiency.

[0056] The high-temperature section 11 of the high-temperature superheater adopts a co-current arrangement, that is, the working fluid temperature at the inlet is lowered and placed in the area with high flue gas temperature, while the working fluid temperature at the outlet is higher and placed in the area with lower flue gas temperature. This can reasonably control the tube wall temperature, reduce the amount of high-end heating surface material used, and increase the economic efficiency of the power plant.

[0057] Specific Implementation Method Nine: Combining Figure 1 — Figure 10 This embodiment describes a composite arrangement structure of high and low temperature heating surfaces in a π-type boiler. The high temperature section 11 of the high temperature superheater is connected to the outlet header 12 of the high temperature section of the high temperature superheater, and the outlet header 12 of the high temperature section of the high temperature superheater is a single header.

[0058] The low-temperature section of the high-temperature superheater is divided into a left high-temperature superheater low-temperature section 1 and a right high-temperature superheater low-temperature section 2. The left high-temperature superheater low-temperature section 1 and the right high-temperature superheater low-temperature section 2 are arranged along the width of the boiler near the water-cooled walls on both sides. The inlet headers of the left high-temperature superheater low-temperature section 1 and the right high-temperature superheater low-temperature section 2 are two independent left inlet headers 3 and right inlet headers 4. The left high-temperature superheater low-temperature section 1 and the right high-temperature superheater low-temperature section 2 are suspended in the flue in the upper part of the furnace. The lower part is a water-cooled membrane wall, and the upper part is divided into the furnace heating surface and the furnace exterior by the center line 15 of the roof tube.

[0059] The low-temperature section 1 of the high-temperature superheater on the left and the low-temperature section 2 of the high-temperature superheater on the right are arranged in countercurrent manner in the furnace to improve the heat transfer temperature difference and increase the heat exchange. The outlets are the left outlet header 5 and the right outlet header 6. At the same time, the desuperheater of the left superheater and the desuperheater of the right superheater 8 are arranged in the left outlet header 5 and the right outlet header 6.

[0060] The high-temperature section 11 of the high-temperature superheater is located on the center side of the boiler along the furnace width direction. It is arranged in a compound, parallel configuration with the low-temperature sections 1 and 2 on the left and right sides of the high-temperature superheater, respectively. The inlet headers for the high-temperature sections of the high-temperature superheater consist of a first high-temperature section inlet header 9 and a second high-temperature section inlet header 10. The first high-temperature section inlet header 9 and the left outlet header 5 are a single, continuous header, and the second high-temperature section inlet header 10 and the right outlet header 6 are also a single, continuous header. This integrated design, combining the low-temperature section outlet header, desuperheater, and high-temperature section inlet header, saves space for boiler header and desuperheater piping. Furthermore, the integrated design facilitates hanging and significantly reduces the furnace depth dimension. The high-temperature section outlet header 12 is a single header. The left superheater desuperheater 7 and the right superheater desuperheater 8 are arranged in the outlet header of the low temperature section of the high temperature superheater.

[0061] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model's technical solution. Any simple modifications, equivalent substitutions, and improvements made to the above embodiments without departing from the scope of the present utility model's technical solution, based on the technical essence of the present utility model and within the spirit and principles of the present utility model, shall still fall within the protection scope of the present utility model's technical solution.

Claims

1. A composite arrangement structure of high and low temperature heating surfaces for a π-type boiler, comprising a high-temperature superheater, characterized in that, The high-temperature superheater includes a low-temperature section (1) of the left high-temperature superheater, a low-temperature section (2) of the right high-temperature superheater, and a high-temperature section (11) of the high-temperature superheater. The low-temperature section (1) of the left high-temperature superheater, the low-temperature section (2) of the right high-temperature superheater, and the high-temperature section (11) of the high-temperature superheater are connected by a header. The low-temperature section (1) of the left high-temperature superheater, the low-temperature section (2) of the right high-temperature superheater, and the high-temperature section (11) of the high-temperature superheater are arranged in a compound parallel arrangement. The compound parallel arrangement is that the two sides are the low-temperature section (1) of the left high-temperature superheater and the low-temperature section (2) of the right high-temperature superheater, and the high-temperature section (11) of the high-temperature superheater is in the middle. The low-temperature section (1) of the left high-temperature superheater and the low-temperature section (2) of the right high-temperature superheater are counter-current, and the high-temperature section (11) of the high-temperature superheater is co-current and arranged in parallel along the furnace width direction. The low-temperature section (1) of the left high-temperature superheater and the low-temperature section (2) of the right high-temperature superheater are arranged in the relatively low-temperature flue gas zone close to the furnace walls on both sides along the width of the furnace, and the high-temperature section (11) of the high-temperature superheater is arranged in the middle position along the width of the furnace.

2. The composite arrangement structure of high and low temperature heating surfaces in a π-type boiler according to claim 1, characterized in that, The low-temperature section (1) of the left high-temperature superheater and the low-temperature section (2) of the right high-temperature superheater are specifically arranged at the positions of the left water-cooled wall (14) and the right water-cooled wall (13) close to both sides along the boiler width direction. The low-temperature section (1) of the left high-temperature superheater and the low-temperature section (2) of the right high-temperature superheater are respectively connected to the left inlet header (3) and the right inlet header (4), and the inlet headers of the low-temperature section (1) of the left high-temperature superheater and the low-temperature section (2) of the right high-temperature superheater are two independent inlet headers.

3. The composite arrangement structure of high and low temperature heating surfaces in a π-type boiler according to claim 2, characterized in that, The left high-temperature superheater low-temperature section (1) and the right high-temperature superheater low-temperature section (2) are suspended in the upper flue of the furnace. The lower part of the left high-temperature superheater low-temperature section (1) and the right high-temperature superheater low-temperature section (2) are water-cooled membrane walls, and the upper part is divided into the furnace heating surface and the furnace outside by the center line (15) of the roof tube.

4. A composite arrangement structure of high and low temperature heating surfaces for a π-type boiler according to claim 2 or 3, characterized in that, The outlets of the low-temperature section (1) of the left high-temperature superheater and the low-temperature section (2) of the right high-temperature superheater are the left outlet header (5) and the right outlet header (6). The left outlet header (5) and the right outlet header (6) are respectively equipped with a left superheater desuperheater (7) and a right superheater desuperheater (8).

5. The composite arrangement structure of high and low temperature heating surfaces in a π-type boiler according to claim 4, characterized in that, The high-temperature section (11) of the high-temperature superheater is connected to the first high-temperature section inlet header (9) and the second high-temperature section inlet header (10). The first high-temperature section inlet header (9) and the left outlet header (5) are a single header of the same length. The second high-temperature section inlet header (10) and the right-side outlet header (6) are a single header of the same length.

6. The composite arrangement structure of high and low temperature heating surfaces in a π-type boiler according to claim 5, characterized in that, The left outlet header (5), right outlet header (6), left superheater desuperheater (7), right superheater desuperheater (8), first high temperature section inlet header (9) and second high temperature section inlet header (10) are an integral structure.

7. The composite arrangement structure of high and low temperature heating surfaces in a π-type boiler according to claim 5, characterized in that, The high-temperature section (11) of the high-temperature superheater is connected to the outlet header (12) of the high-temperature section of the high-temperature superheater, and the outlet header (12) of the high-temperature section of the high-temperature superheater is a single header.

8. The composite arrangement structure of high and low temperature heating surfaces in a π-type boiler according to claim 4, characterized in that, The low-temperature section (1) of the left high-temperature superheater and the low-temperature section (2) of the right high-temperature superheater are arranged in the furnace in a counter-current manner.

9. The composite arrangement structure of high and low temperature heating surfaces in a π-type boiler according to claim 7, characterized in that, The high-temperature section (11) of the high-temperature superheater is arranged in the furnace in a co-current manner.

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