Steam and hot air dual-purpose boiler

Abstract

The invention provides a steam and hot air dual-purpose boiler. The steam and hot air dual-purpose boiler comprises a hearth, an upper boiler barrel, a lower boiler barrel and a smoke mixing chamber. A convection heating surface is formed between the upper boiler barrel and the lower boiler barrel; a heat insulation burnout chamber and a water cooling burnout chamber are connected to an outlet of the hearth, and the heat insulation burnout chamber and the water cooling burnout chamber are staggered by 90 degrees. An outlet of the heat insulation burnout chamber is communicated with the front end of the convection heating surface, and the rear end of the convection heating surface is communicated with the flue gas mixing chamber through a first high-temperature flue; the water-cooling burnout chamber extends from top to bottom, and the lower portion of the water-cooling burnout chamber communicates with the flue gas mixing chamber through a second high-temperature flue. Due to the fact that the first high-temperature flue is connected with the rear end of the convection heating surface, the temperature of high-temperature flue gas coming out of the hearth can be greatly reduced after the high-temperature flue gas passes through the convection heating surface, and due to the fact that the second high-temperature flue is connected with the lower portion of the water-cooling burnout chamber, the temperature of the high-temperature flue gas coming out of the hearth can be greatly reduced after the high-temperature flue gas passes through the water-cooling burnout chamber. Therefore, the service life of related parts can be ensured.

Description

Technical Field

[0001] This invention relates to the field of boiler technology, specifically to a dual-purpose steam and hot air boiler. Background Technology

[0002] A dual-purpose steam and hot air boiler is an industrial device that can simultaneously generate steam and hot air, suitable for scenarios requiring two heat sources, such as food processing and textile drying. Its core feature is that the medium is heated through a combustion system (coal, gas, or biomass). The generated steam is used for cooking or sterilization, while the hot air is used for drying or heating. Generally, because the high-temperature flue gas generated in the boiler furnace is very hot, directly entering the high-temperature flue can easily damage it, affecting its service life. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a steam and hot air dual-purpose boiler with a high-temperature flue that is not easily damaged.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a steam and hot air dual-purpose boiler, including a furnace, an upper drum, a lower drum, and a flue gas mixing chamber; a convective heating surface is formed between the upper drum and the lower drum; an adiabatic burnout chamber and a water-cooled burnout chamber are connected at the furnace outlet, the adiabatic burnout chamber and the water-cooled burnout chamber are offset from each other at 90°; the outlet of the adiabatic burnout chamber is connected to the front end of the convective heating surface, and the rear end of the convective heating surface is connected to the flue gas mixing chamber through a first high-temperature flue; the water-cooled burnout chamber extends from top to bottom, and the lower part of the water-cooled burnout chamber is connected to the flue gas mixing chamber through a second high-temperature flue.

[0005] In the above technical solution, on the one hand, since the first high-temperature flue is connected to the rear end of the convective heating surface, the temperature of the high-temperature flue gas coming out of the furnace is significantly reduced after passing through the convective heating surface between the upper and lower drums. On the other hand, since the second high-temperature flue is connected to the lower part of the water-cooled burnout chamber, the temperature of the high-temperature flue gas coming out of the furnace is also significantly reduced after passing through the water-cooled burnout chamber. This ensures that the temperature of the flue gas entering the first and second high-temperature flues and the flue gas mixing chamber is not too high, thereby guaranteeing the service life of related components. Specifically, the water-cooled burnout chamber has three functions: first, it extends the residence time of the flue gas in the furnace, allowing the combustible gases in the flue gas to burn completely; second, it has a settling effect, reducing particulate matter in the tail flue gas; and third, it can reduce the flue gas temperature to below 600°C, preventing the temperature of the high-temperature flue gas from becoming too high, thus preventing damage to the subsequent high-temperature flue and flue gas mixing chamber due to high temperatures. The adiabatic combustion chamber has two functions: first, it prolongs the residence time of flue gas in the furnace, allowing the combustible gases in the flue gas to burn completely; second, it has a settling effect, reducing particulate matter in the tail flue gas.

[0006] Furthermore, both the first and second high-temperature flues are equipped with electric dampers. These electric dampers allow for very convenient adjustment of the steam and hot air demand.

[0007] Preferably, the furnace and the water-cooled combustion chamber are adjacent and both have a full membrane wall structure. This structure provides good sealing, thereby improving the overall thermal efficiency of the boiler.

[0008] In one embodiment, the flue gas mixing chamber is connected to a dust collector via a pipe, and the dust collector is then connected to an induced draft fan via a pipe.

[0009] In one embodiment, ash collection devices are installed at the bottom of the adiabatic burnout chamber and the water-cooled burnout chamber, respectively.

[0010] In one embodiment, a reciprocating grate is provided below the furnace. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the overall structure of the boiler in an embodiment of the present invention;

[0012] The attached figures are labeled as follows:

[0013] 1. Furnace chamber; 2. Water-cooled combustion chamber; 3. Adiabatic combustion chamber; 4. Upper boiler drum; 5. Lower boiler drum; 6. Convection heating surface; 7. First high-temperature flue; 8. Second high-temperature flue; 9. Electric damper; 10. Flue gas mixing chamber; 11. Dust collector; 12. Exhaust fan; 13. Reciprocating grate. Detailed Implementation

[0014] 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.

[0015] 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.

[0016] like Figure 1The boiler shown is a dual-purpose steam and hot air boiler, comprising a furnace 1, an upper drum 4, a lower drum 5, and a flue gas mixing chamber 10. A reciprocating grate 13 is provided below the furnace 1. A convective heating surface 6 is formed between the upper drum 4 and the lower drum 5. An adiabatic burnout chamber 3 and a water-cooled burnout chamber 2 are connected at the outlet of the furnace 1, and the adiabatic burnout chamber 3 and the water-cooled burnout chamber 2 are offset from each other at 90°. The furnace 1 and the water-cooled burnout chamber 2 are adjacent and both are full membrane wall structures. Ash collection devices are installed at the bottom of the adiabatic burnout chamber 3 and the water-cooled burnout chamber 2 respectively. The outlet of the adiabatic burnout chamber 3 is connected to the convective heating surface. The front end of the convective heating surface 6 is connected, and the rear end of the convective heating surface 6 is connected to the flue gas mixing chamber 10 through the first high-temperature flue 7; the water-cooled burnout chamber 2 extends from top to bottom, and the lower part of the water-cooled burnout chamber 2 is connected to the flue gas mixing chamber 10 through the second high-temperature flue 8; both the first high-temperature flue 7 and the second high-temperature flue 8 are equipped with electric gates 9; the flue gas coming out of the water-cooled burnout chamber 2 enters the flue gas mixing chamber 10 through the second high-temperature flue 8 and mixes with the low-temperature flue gas coming out of the convective heating surface 6; the flue gas mixing chamber 10 is connected to the dust collector 11 through a pipe, and the dust collector 11 is then connected to the induced draft fan 12 through a pipe.

[0017] Specifically, the water-cooled combustion chamber 2 has three functions: first, it prolongs the residence time of flue gas in the furnace 1, allowing the combustible gases in the flue gas to burn completely; second, it has a settling effect, reducing particulate matter in the tail flue gas; and third, it can reduce the flue gas temperature to below 600°C, preventing the high-temperature flue gas from becoming too hot, thus preventing damage to the subsequent high-temperature flue and flue gas mixing chamber 10 due to high temperatures. The adiabatic combustion chamber 3 has two functions: first, it prolongs the residence time of flue gas in the furnace 1, allowing the combustible gases in the flue gas to burn completely; and second, it has a settling effect, reducing particulate matter in the tail flue gas.

[0018] In this embodiment, on the one hand, since the first high-temperature flue 7 is connected to the rear end of the convection heating surface 6, the temperature of the high-temperature flue gas coming out of the furnace 1 can be significantly reduced after passing through the convection heating surface 6 between the upper drum 4 and the lower drum 5. On the other hand, since the second high-temperature flue 8 is connected to the lower part of the water-cooled combustion chamber 2, the temperature of the high-temperature flue gas coming out of the furnace 1 can also be significantly reduced after passing through the water-cooled combustion chamber 2. This ensures that the temperature of the flue gas entering the first and second high-temperature flues 8 and the flue gas mixing chamber 10 will not be too high, thereby ensuring the service life of the relevant components.

[0019] The boiler provided in this embodiment can fully utilize the waste heat of the flue gas at the tail end of the boiler for drying while meeting the requirements for steam production, thereby achieving energy-saving effects. Since an electric damper 9 is installed on the first high-temperature flue 7 behind the convection heating surface 6 and on the second high-temperature flue 8 behind the water-cooled combustion chamber 2, if the temperature of the dried flue gas is insufficient during operation, the electric damper 9 on the second high-temperature flue 8 is opened wider to release more high-temperature flue gas, thus increasing the final flue gas temperature at the tail end. If too much steam is produced, the electric damper 9 on the first flue is closed narrower. By adjusting the opening and closing degree of the electric dampers 9 on the first and second high-temperature flues, the steam and hot air demand can be guaranteed.

[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 dual-purpose boiler for steam and hot air, characterized by: It includes hearth (1), upper drum (4), lower drum (5), flue gas mixing chamber (10); the convection heating surface (6) is formed between upper drum (4) and lower drum (5); an adiabatic burn-out chamber (3) and a water-cooled burn-out chamber (2) are connected at the outlet of hearth (1), the adiabatic burn-out chamber (3) and the water-cooled burn-out chamber (2) are staggered by 90 °; the outlet of the adiabatic burn-out chamber (3) is communicated with the front end of the convection heating surface (6), the rear end of the convection heating surface (6) is communicated with the flue gas mixing chamber (10) through the first high-temperature flue (7); the water-cooled burn-out chamber (2) extends from top to bottom, the lower part of the water-cooled burn-out chamber (2) is communicated with the flue gas mixing chamber (10) through the second high-temperature flue (8).

2. The dual-purpose boiler according to claim 1, wherein: The first high-temperature flue (7) and the second high-temperature flue (8) are both provided with electric gate (9).

3. A dual-purpose boiler according to claim 1 or 2, characterised in that: The hearth (1) and the water-cooled burn-out chamber (2) are adjacent and both are full membrane wall structure.

4. The dual-purpose boiler according to claim 1 or 2, characterized in that: The flue gas mixing chamber (10) is communicated with the dust collector (11) through pipeline, the dust collector (11) is communicated with the induced draft fan (12) through pipeline.

5. The dual-purpose boiler according to claim 1 or 2, wherein: The bottom of the adiabatic burn-out chamber (3) and the water-cooled burn-out chamber (2) is respectively provided with ash falling device.

6. The dual-purpose boiler according to claim 1 or 2, characterized in that: The lower part of the hearth (1) is provided with reciprocating grate (13).

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