High-capacity shell boiler

Abstract

The invention provides a high-capacity shell boiler which comprises a hearth, an upper shell, a middle shell and a lower shell, and the upper shell, the middle shell and the lower shell are transversely arranged on the right side of the hearth from top to bottom. The upper boiler shell is communicated with the middle boiler shell through a steam communicating pipe, the middle boiler shell is communicated with the lower boiler shell through a steam communicating pipe, and a plurality of transverse smoke pipes are arranged in the upper boiler shell, the middle boiler shell and the lower boiler shell; a front smoke box is arranged at the left end of the upper boiler shell, a rear smoke box is arranged at the right end of the upper boiler shell, a rear smoke box is arranged at the left end of the middle boiler shell, a front smoke box is arranged at the right end of the middle boiler shell, and a front smoke box is arranged at the left end of the lower boiler shell. A burnout chamber is arranged at an outlet of the hearth and communicated with the front smoke box of the upper boiler shell through a high-temperature flue, the rear smoke box of the upper boiler shell is communicated with the front smoke box of the middle boiler shell through a high-temperature flue, the rear smoke box of the middle boiler shell is communicated with the front smoke box of the lower boiler shell through a high-temperature flue, and the rear smoke box of the lower boiler shell is communicated to a smoke outlet. The capacity of the boiler can be increased, and transportation and installation are convenient.

Description

Technical Field

[0001] This invention relates to the field of boiler technology, and specifically to a shell boiler. Background Technology

[0002] Boilers can be structurally classified into shell boilers and water-tube boilers. The core difference lies in the arrangement of the heating surfaces and the flow direction of the working fluid and flue gas: In shell boilers, the heating surfaces (such as fire tubes) are mainly arranged inside the shell, with flue gas flowing inside the tubes while water absorbs heat outside; in water-tube boilers, the opposite is true, with flue gas flowing outside the tubes and water being heated inside. Shell boilers typically have an evaporation capacity of less than 2 tons / hour and an operating pressure below 0.8 MPa, making them suitable for small-scale industrial or heating applications. Water-tube boilers can be designed for large capacities (e.g., 35 tons / hour and above) and high parameters (pressure up to 160 bar, steam temperature 550°C), and are widely used in power plants or large-scale industries. However, large-capacity water-tube boilers have very high manufacturing, transportation, and installation costs, and require a significant amount of installation space. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a large-capacity boiler shell that is easy to transport and install.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a large-capacity boiler shell, including a furnace, an upper shell, a middle shell, and a lower shell, wherein the upper shell, middle shell, and lower shell are arranged horizontally on the right side of the furnace in stages from top to bottom; the upper shell and the middle shell are connected by a steam connecting pipe, and the middle shell and the lower shell are connected by a steam connecting pipe; multiple horizontal smoke pipes are provided in the upper shell, the middle shell, and the lower shell; a front smoke box is provided at the left end of the upper shell and a rear smoke box at the right end; a rear smoke box is provided at the left end of the middle shell and a front smoke box at the right end; a front smoke box is provided at the left end of the lower shell and a rear smoke box at the right end; a combustion chamber is provided at the furnace outlet, the combustion chamber is connected to the front smoke box of the upper shell through a high-temperature flue, the rear smoke box of the upper shell is connected to the front smoke box of the middle shell through a high-temperature flue, the rear smoke box of the middle shell is connected to the front smoke box of the lower shell through a high-temperature flue, and the rear smoke box of the lower shell is connected to the flue gas outlet.

[0005] In the above technical solution, since the upper, middle and lower boiler shells are horizontally placed and connected in series through a high-temperature flue, they form a convective heating surface. This can increase the overall capacity of the boiler while ensuring that the size of each individual boiler shell is not too large, thereby reducing manufacturing, transportation and installation costs, and also reducing the overall boiler footprint.

[0006] Furthermore, the front smoke box is equipped with a front smoke box door, on which multiple pulse soot blowers are installed, each corresponding to a smoke pipe. One pulse soot blower is directed at one smoke pipe. The pulse soot blowers are controlled by a PLC program, automatically or periodically blowing soot according to the degree of ash accumulation, ensuring that the smoke pipes do not accumulate ash.

[0007] Furthermore, the upper part of the furnace is provided with an upper header, which is connected to the upper boiler shell via a steam connecting pipe. The lower part of the furnace is provided with a lower header, which is connected to the lower boiler shell via a downcomer. The upper header is connected to the upper boiler shell via a steam connecting pipe, which allows steam generated by the radiant heating surface of the furnace to be introduced to the upper boiler shell. The lower header is connected to the lower boiler shell via a downcomer, which allows the lower boiler shell to supply water to the lower header through the downcomer.

[0008] In one embodiment, the lower pot shell is provided with a water inlet, and the upper pot shell is provided with a steam outlet.

[0009] In one embodiment, the rear smoke box is provided with a rear smoke box door.

[0010] In one embodiment, the radiant heating surface of the furnace is a full membrane wall structure, and a reciprocating grate is provided below the furnace. The full membrane wall structure has the advantages of good sealing and good heat preservation.

[0011] The beneficial effects of the present invention are: 1) The convection heating surface is composed of 3 boiler shells, forming a modular structure, which facilitates transportation and installation and can be combined into a large-tonnage boiler; 2) The convection heating surface is composed of 3 boiler shells stacked in three layers (upper, middle and lower), which greatly reduces the floor space and makes the furnace higher and the combustion more complete. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure of the boiler in an embodiment of the present invention;

[0013] The attached figures are labeled as follows:

[0014] 1. Furnace; 2. Combustion chamber; 3. Upper boiler shell; 4. Middle boiler shell; 5. Lower boiler shell; 6. Front smoke box; 7. Rear smoke box; 8. Steam connecting pipe; 9. Upper header; 10. Lower header; 11. Downcomer; 12. Water inlet; 13. Sewage outlet; 14. Steam outlet; 15. High-temperature flue; 16. Pulse soot blower; 17. Reciprocating grate. Detailed Implementation

[0015] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to embodiments and accompanying drawings. The content mentioned in the embodiments is not intended to limit the present invention.

[0016] It should be noted in advance that, in this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0017] like Figure 1 The large-capacity boiler shown includes a furnace 1, an upper shell 3, a middle shell 4, and a lower shell 5. The radiant heating surface of the furnace 1 is a full membrane wall structure. A reciprocating grate 17 is provided below the furnace 1. The upper shell 3, middle shell 4, and lower shell 5 are arranged horizontally from top to bottom on the right side of the furnace 1 to form a convective heating surface. The upper shell 3 has a steam outlet 14. The upper shell 3 and the middle shell 4 are connected by a steam connecting pipe 8. The middle shell 4 and the lower shell 5 are also connected by a steam connecting pipe 8. The lower shell 5 has a water inlet 12 and a drain outlet 13. Multiple transverse flue pipes are provided inside the upper shell 3, middle shell 4, and lower shell 5. Flue gas flows inside the flue pipes, and a water-accommodating jacket is formed between the flue pipes and the boiler shells. A front smoke box is provided at the left end of the upper shell 3. 6. A rear smoke box 7 is located at the right end of the furnace. A rear smoke box 7 is located at the left end of the middle pot shell 4, and a front smoke box 6 is located at the right end of the middle pot shell 4. A front smoke box 6 is located at the left end of the lower pot shell 5, and a rear smoke box 7 is located at the right end of the furnace. A combustion chamber 2 is located at the outlet of the furnace 1. The combustion chamber 2 is connected to the front smoke box 6 of the upper pot shell 3 through a high-temperature flue 15. The rear smoke box 7 of the upper pot shell 3 is connected to the front smoke box 6 of the middle pot shell 4 through a high-temperature flue 15. The rear smoke box 7 of the middle pot shell 4 is connected to the front smoke box 6 of the lower pot shell 5 through a high-temperature flue 15. The rear smoke box 7 of the lower pot shell 5 is connected to the flue gas outlet. The rear smoke box 7 has a rear smoke box 7 door, and the front smoke box 6 has a front smoke box 6 door. Multiple pulse soot blowers 16 are installed on the front smoke box 6 door, each corresponding to a smoke pipe. One pulse soot blower 16 is directed to blow soot onto one smoke pipe. The pulse soot blowers 16 are controlled by a PLC program and automatically or periodically blow soot according to the degree of ash accumulation to ensure that the smoke pipes do not accumulate ash.

[0018] like Figure 1 As shown, the upper part of the furnace 1 is provided with an upper header 9, which is connected to the upper pot shell 3 through a steam connecting pipe 8, so as to introduce the steam generated by the radiant heating surface of the furnace 1 into the upper pot shell 3. The lower part of the furnace 1 is provided with a lower header 10, which is connected to the lower pot shell 5 through a downcomer 11, so as to enable the lower pot shell 5 to replenish water to the lower header 10 through the downcomer 11.

[0019] Since the upper shell 3, middle shell 4, and lower shell 5 are horizontally arranged vertically and connected in series through the high-temperature flue 15, they form a convective heating surface. This increases the overall capacity of the boiler while ensuring that the size of each individual shell is not too large, thereby reducing manufacturing, transportation, and installation costs, and also reducing the overall boiler footprint. Because the convective heating surface is composed of three shells, it forms a modular structure, which facilitates transportation and installation, and can be combined into a large-tonnage boiler, greatly reducing the footprint and allowing the furnace 1 to be higher and combustion to be more complete.

[0020] The above embodiments are preferred implementations of the present invention. In addition, the present invention can be implemented in other ways. Any obvious substitutions without departing from the concept of the present technical solution are within the protection scope of the present invention.

[0021] To facilitate understanding by those skilled in the art of the improvements of this invention over the prior art, some of the accompanying drawings and descriptions have been simplified, and for clarity, some other elements have been omitted from this application. Those skilled in the art should realize that these omitted elements may also constitute the content of this invention.

Claims

1. A large-capacity boiler shell, characterized in that: The furnace includes a furnace chamber (1), an upper pot shell (3), a middle pot shell (4), and a lower pot shell (5). The upper pot shell (3), the middle pot shell (4), and the lower pot shell (5) are arranged horizontally from top to bottom on the right side of the furnace chamber (1). The upper pot shell (3) and the middle pot shell (4) are connected by a steam connecting pipe (8), and the middle pot shell (4) and the lower pot shell (5) are connected by a steam connecting pipe (8). Multiple horizontal smoke pipes are provided inside the upper pot shell (3), the middle pot shell (4), and the lower pot shell (5). The upper pot shell (3) has a front smoke box (6) at the left end and a rear smoke box (7) at the right end. The middle pot shell (4) has a rear smoke box at the left end. The furnace (7) has a front smoke box (6) at the right end, a front smoke box (6) at the left end of the lower shell (5), and a rear smoke box (7) at the right end. A combustion chamber (2) is provided at the outlet of the furnace (1). The combustion chamber (2) is connected to the front smoke box (6) of the upper shell (3) through a high-temperature flue (15). The rear smoke box (7) of the upper shell (3) is connected to the front smoke box (6) of the middle shell (4) through a high-temperature flue (15). The rear smoke box (7) of the middle shell (4) is connected to the front smoke box (6) of the lower shell (5) through a high-temperature flue (15). The rear smoke box (7) of the lower shell (5) is connected to the flue gas outlet.

2. The large-capacity boiler shell according to claim 1, characterized in that: The front smoke box (6) is provided with a front smoke box (6) door, and multiple pulse soot blowers (16) corresponding to the smoke pipes are provided on the front smoke box (6) door. One pulse soot blower (16) is aimed at one smoke pipe to blow soot.

3. The large-capacity boiler shell according to claim 1 or 2, characterized in that: The upper part of the furnace (1) is provided with an upper header (9), which is connected to the upper pot shell (3) through a steam connecting pipe (8). The lower part of the furnace (1) is provided with a lower header (10), which is connected to the lower pot shell (5) through a downcomer (11).

4. The large-capacity boiler shell according to claim 1 or 2, characterized in that: The lower pot shell (5) is provided with a water inlet (12), and the upper pot shell (3) is provided with a steam outlet (14).

5. The large-capacity boiler shell according to claim 1 or 2, characterized in that: The rear smoke box (7) is provided with a rear smoke box (7) door.

6. The large-capacity boiler shell according to claim 1 or 2, characterized in that: The radiant heating surface of the furnace (1) is a full membrane wall structure, and a reciprocating grate (17) is provided below the furnace (1).

Images