Hydrogen-fired steam boiler with water-fire tube structure

Abstract

The utility model relates to a water-fire tube structure hydrogen-fired steam boiler which comprises a hearth, a convection heating surface, an energy saver and an overhead steam pocket, the hearth, the convection heating surface and the energy saver are sequentially arranged in a linear mode, and the overhead steam pocket is respectively communicated with the hearth and the convection heating surface through a steam-water pipeline. And the overhead steam pocket is arranged at the upper parts of the hearth and the convection heating surface. By optimizing the overall structure of the boiler, the flue gas flow of the boiler is reduced, and the device can be applied to a compact site or a scene where pure hydrogen gas fuel is combusted, and is safe and reliable.

Description

Technical Field

[0001] The utility model relates to the technical field of boilers, in particular to a hydrogen-fired steam boiler with a water-fire tube structure. Background Art

[0002] A boiler is an energy conversion device. The energy input into the boiler includes chemical energy in fuel and electric energy, and the boiler outputs steam, high-temperature water or organic heat carriers with a certain amount of heat energy. With the continuous development of industrial boiler technology, various types and structures of steam boilers emerge in an endless stream, and the related technologies have become more and more mature while meeting the market demand.

[0003] For the existing steam boiler technology with a water-fire tube structure, most of the structural forms adopt Type A furnaces. The furnace is composed of membrane water walls on both sides and headers, and a shell-type fire tube heating surface is arranged on the upper part. The production and manufacturing of this type of boiler are cumbersome, the actual flue gas flow process is more, and the application scenarios are relatively limited. Especially in the use of pure hydrogen fuel, there is still a hidden danger of accidents caused by fuel accumulation. Summary of the Utility Model

[0004] The purpose of the utility model is to overcome the above deficiencies and provide a hydrogen-fired steam boiler with a water-fire tube structure, which has a compact structure, a simple flue gas flow process, a low operation resistance and strong applicability.

[0005] The purpose of the utility model is realized as follows:

[0006] A hydrogen-fired steam boiler with a water-fire tube structure includes a furnace, a convective heating surface, an economizer and a top-mounted steam drum. The furnace, the convective heating surface and the economizer are arranged linearly in sequence. The top-mounted steam drum is connected to the furnace and the convective heating surface respectively through steam-water pipelines, and the top-mounted steam drum is arranged above the furnace and the convective heating surface.

[0007] Preferably, the furnace adopts a water tube structure, and the convective heating surface adopts a fire tube structure.

[0008] Preferably, the furnace includes a furnace upper header, a furnace lower header, a furnace front wall water-cooled wall, a furnace left membrane wall and a furnace right membrane wall. The furnace left membrane wall and the furnace right membrane wall are respectively paired and welded with the furnace upper header and the furnace lower header, and the furnace front wall water-cooled wall is paired with the furnace upper header and the furnace lower header;

[0009] The convective heating surface includes a front tube sheet, a cylinder body, a rear tube sheet and threaded smoke tubes.

[0010] Preferably, a sealing box is arranged between the tail of the furnace and the front part of the convective heating surface.

[0011] Preferably, the heating surface tubes of the furnace left membrane wall and the furnace right membrane wall adopt multiple bends.

[0012] Preferably, the steam-water pipeline includes a steam-water downcomer and a steam-water pipeline riser. The bottom of the top-mounted steam drum is respectively connected to the bottom of the furnace and the convective heating surface through the steam-water downcomer, and the side wall of the top-mounted steam drum is respectively connected to the top of the furnace and the convective heating surface through the steam-water riser.

[0013] The beneficial effects of the present utility model are as follows:

[0014] By linearly optimizing the layout of the boiler furnace, convective heating surface and economizer, and adopting a primary flue gas flow, while reducing the flue gas flow during boiler operation, the flue gas resistance can be fully reduced. Through this, the accumulation of fuel or flue gas can be avoided. Especially for the application scenario of burning pure hydrogen fuel, the risk of accidents can be reduced. At the same time, by reducing the boiler flue gas resistance, the overall investment cost and subsequent operation cost of the boiler can be reduced. Description of the Drawings

[0015] Figure 1 It is the front view of a hydrogen-fired steam boiler with a water-fire tube structure of the present utility model.

[0016] Figure 2 It is the left sectional view of a hydrogen-fired steam boiler with a water-fire tube structure of the present utility model.

[0017] Figure 3 It is the top view of a hydrogen-fired steam boiler with a water-fire tube structure of the present utility model.

[0018] Wherein: 1. Furnace; 1.1. Upper header of the furnace; 1.2. Lower header of the furnace; 1.3. Water-cooled wall of the front wall of the furnace; 1.4. Left membrane wall of the furnace; 1.5. Right membrane wall of the furnace; 2. Convective heating surface; 2.1. Front tube sheet; 2.2. Cylinder body; 2.3. Rear tube sheet; 2.4. Threaded smoke tube; 3. Top-mounted steam drum; 4. Steam-water pipeline; 5. Economizer. Detailed Embodiments

[0019] Refer to Figures 1-3 , the present utility model relates to a hydrogen-fired steam boiler with a water-fire tube structure, including a furnace 1, a convective heating surface 2, an economizer 5 and a top-mounted steam drum 3. The furnace 1, the convective heating surface 2 and the economizer 5 are arranged linearly in sequence. The top-mounted steam drum 3 is respectively communicated with the furnace 1 and the convective heating surface 2 through a steam-water pipeline 4. The top-mounted steam drum 3 is arranged above the furnace 1 and the convective heating surface 2.

[0020] The furnace 1 adopts a water-tube structure, including an upper header 1.1 of the furnace, a lower header 1.2 of the furnace, a water-cooled wall 1.3 on the front wall of the furnace, a membrane wall 1.4 on the left side of the furnace, and a membrane wall 1.5 on the right side of the furnace. The membrane wall 1.4 on the left side of the furnace and the membrane wall 1.5 on the right side of the furnace are respectively paired and welded with the upper header 1.1 of the furnace and the lower header 1.2 of the furnace, and the water-cooled wall 1.3 on the front wall of the furnace is paired with the upper header 1.1 of the furnace and the lower header 1.2 of the furnace.

[0021] The convective heating surface 2 adopts a fire-tube structure, including a front tube sheet 2.1, a cylinder body 2.2, a rear tube sheet 2.3, and threaded smoke tubes 2.4.

[0022] A sealing box is arranged between the tail of the furnace 1 and the front part of the convective heating surface 2 to ensure the overall sealing performance.

[0023] The membrane wall 1.4 on the left side of the furnace and the membrane wall 1.5 on the right side of the furnace adopt a fully sealed structure, and fins are welded between the heating surface steel pipes to ensure the sealing performance.

[0024] The heating surface pipes of the membrane wall 1.4 on the left side of the furnace and the membrane wall 1.5 on the right side of the furnace are bent multiple times to maximize the actual volume inside the furnace 1.

[0025] The furnace 1, the convective heating surface 2, and the economizer 5 are linearly arranged with a single-pass flue gas flow to reduce the flue gas resistance.

[0026] The steam-water pipeline 4 includes a steam-water downcomer and a steam-water pipeline riser. The bottom of the top-mounted steam drum is respectively connected to the bottom of the furnace and the convective heating surface through the steam-water downcomer; the side wall of the top-mounted steam drum is respectively connected to the top of the furnace and the convective heating surface through the steam-water riser.

[0027] The flue gas flow of the boiler is: burner → furnace → convective heating surface → economizer → tail chimney.

[0028] The steam-water flow of the boiler is: treated feed water → economizer → top-mounted steam drum → steam-water downcomer → furnace and convective heating surface → steam-water riser → top-mounted steam drum → main steam outlet. The flue gas heat of the furnace and the convective heating surface is collected into the top-mounted steam drum through the steam-water riser, and the steam-water mixture is separated in the top-mounted steam drum 3, and then the steam is supplied to the outside through the main steam outlet for use.

[0029] In addition to the above embodiments, the present invention also includes other implementation manners. Any technical solutions formed by equivalent transformation or equivalent substitution shall fall within the protection scope of the claims of the present invention.

Claims

1. A hydrogen-fired steam boiler with a water-fire tube structure, characterized in that: It includes a furnace (1), a convective heating surface (2), an economizer (5) and an overhead steam drum (3). The furnace (1), the convective heating surface (2) and the economizer (5) are arranged linearly in sequence. The overhead steam drum (3) is connected to the furnace (1) and the convective heating surface (2) respectively through steam-water pipelines (4), and the overhead steam drum (3) is arranged above the furnace (1) and the convective heating surface (2).

2. A hydrogen-fired steam boiler with a water-fire tube structure according to claim 1, characterized in that: The furnace (1) adopts a water-tube structure, and the convective heating surface (2) adopts a fire-tube structure.

3. A hydrogen-fired steam boiler with a water-fire tube structure according to claim 1 or 2, characterized in that: The furnace (1) includes a furnace upper header (1.1), a furnace lower header (1.2), a furnace front wall water-cooled wall (1.3), a furnace left membrane wall (1.4) and a furnace right membrane wall (1.5). The furnace left membrane wall (1.4) and the furnace right membrane wall (1.5) are respectively paired and welded with the furnace upper header (1.1) and the furnace lower header (1.2), and the furnace front wall water-cooled wall (1.3) is paired with the furnace upper header (1.1) and the furnace lower header (1.2); The convective heating surface (2) includes a front tube sheet (2.1), a cylinder body (2.2), a rear tube sheet (2.3) and threaded smoke tubes (2.4).

4. A hydrogen-fired steam boiler with a water-fire tube structure according to claim 1, characterized in that: A sealing box is arranged between the tail of the furnace (1) and the front part of the convective heating surface (2).

5. A hydrogen-fired steam boiler with a water-fire tube structure according to claim 3, characterized in that: The heating surface tubes of the furnace left membrane wall (1.4) and the furnace right membrane wall (1.5) adopt multiple bends.

6. A hydrogen-fired steam boiler with a water-fire tube structure according to claim 1, characterized in that: The steam-water pipeline (4) includes a steam-water downcomer and a steam-water pipeline riser. The bottom of the overhead steam drum (3) is connected to the bottoms of the furnace (1) and the convective heating surface (2) respectively through the steam-water downcomer, and the side walls of the overhead steam drum (3) are connected to the tops of the furnace (1) and the convective heating surface (2) respectively through the steam-water riser.

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