External superheater based on safe and stable operation of biomass industrial boiler

Abstract

The utility model relates to the technical field of biomass industrial boiler, and disclose a kind of external superheater based on the safe and stable operation of biomass industrial boiler, including boiler, the side of the boiler is provided with external box frame, the outer surface bottom end of the external box frame is fixedly installed with support frame, the outer surface of the boiler is fixedly installed with steam pipe;Low-temperature superheater, it is installed in the internal bottom end of external box frame, the boiler is transported steam to low-temperature superheater inside by steam pipe. By setting low-temperature superheater, high-temperature superheater and water spray desuperheater, two-stage superheater is used to realize "step heating", balance heating efficiency and equipment life, water spray desuperheater is arranged at the outlet of low-temperature superheater, for rough adjustment superheated steam temperature, steam temperature is reduced by water spray atomization heat absorption, protect subsequent high-temperature superheater pipe material as "safety redundancy", steam overtemperature risk caused by load fluctuation, fuel change is responded, steam parameter stability is ensured.

Description

Technical Field

[0001] This utility model relates to the field of biomass industrial boiler technology, specifically an external superheater for the safe and stable operation of a biomass industrial boiler. Background Technology

[0002] An external superheater for an industrial boiler is a device used to increase the temperature of steam. It is usually installed at the rear of the boiler and further heats the dry saturated steam in the steam drum to make it superheated steam, thereby improving the boiler's thermal efficiency and reducing the flue gas temperature.

[0003] For example, Chinese Patent CN118816184B discloses a condensing steam boiler with an external superheater, which includes a steam boiler body and a flue gas duct installed on the steam boiler body. A first separation component for separating solid particles in the flue gas is installed inside the flue gas duct. The first separation component includes an installation sleeve installed on the flue gas duct, a first separation plate and a second separation plate rotatably connected to the flue gas duct, and a second separation component is also installed inside the flue gas duct. Both the first and second separation plates are provided with sealing components for sealing the first and second separation plates. A first discharge port is provided on the installation sleeve, and an adjustment component for sealing the first discharge port is provided on the first separation plate. This application facilitates the cleaning of solid particles from the filter screen inside the flue gas duct. Traditional superheaters are installed inside the furnace cavity, making internal temperature difficult to control. Superheaters operating at high temperatures for extended periods are prone to damage. Furthermore, maintenance is difficult when the superheater is installed inside the furnace cavity. Therefore, an external superheater based on the safe and stable operation of a biomass industrial boiler is proposed to solve the above problems. Utility Model Content

[0004] (a) Technical problems to be solved To address the shortcomings of existing technologies, this utility model provides an external superheater for the safe and stable operation of a biomass industrial boiler. It has the advantages of stable temperature rise and high safety, and solves the problem of difficult temperature control in traditional methods.

[0005] (II) Technical Solution To achieve the aforementioned goals of stable temperature rise and high safety, this utility model provides the following technical solution: an external superheater for safe and stable operation of a biomass industrial boiler, comprising: A boiler, wherein an external frame is provided on one side of the boiler, a support frame is fixedly installed on the bottom of the outer surface of the external frame, and a steam pipe is fixedly installed on the outer surface of the boiler; A low-temperature superheater is installed at the bottom of the inner side of an external frame. The boiler supplies steam to the low-temperature superheater through a steam pipe. A high-temperature superheater is fixedly installed inside the external frame above the low-temperature superheater. A water spray desuperheater is fixedly installed on one side of the low-temperature superheater, and the low-temperature superheater and the high-temperature superheater are connected through the water spray desuperheater.

[0006] Preferably, both the low-temperature superheater and the high-temperature superheater are fixedly installed with serpentine pipes for transporting steam. The saturated steam generated by the steam drum first enters the low-temperature superheater through the steam pipe, and then uses the medium-temperature flue gas from the boiler tail flue for primary heating.

[0007] Preferably, one end of the water spray desuperheater is fixedly connected to the steam output end of the serpentine tube inside the low-temperature superheater. The entire process is carried out by adjusting the flue gas flow and steam temperature through the water spray desuperheater to avoid superheater overheating and creep, and to ensure stable steam parameters.

[0008] Preferably, an inspection door is provided on one side of the shell of the low-temperature superheater, and one end of the inspection door is hinged to the shell of the low-temperature superheater. In case of a fault, the inspection door can be opened to facilitate the inspection and maintenance of the internal components.

[0009] Preferably, the shell of the low-temperature superheater is provided with a heat insulation layer to reduce the impact of the external environment on the internal steam heating.

[0010] Preferably, the outer surface of the external frame is provided with a dust removal port, and a shock wave soot blower is fixedly installed on the outer surface of the external frame on the side corresponding to the dust removal port. The shock wave is generated by mixing and burning combustible gases such as acetylene and natural gas with air to remove accumulated ash and improve heat exchange efficiency.

[0011] (III) Beneficial Effects Compared with the prior art, this utility model provides an external superheater for the safe and stable operation of a biomass industrial boiler, which has the following advantages: By setting up a low-temperature superheater, a high-temperature superheater, and a water spray desuperheater, a two-stage superheater is used to achieve "step-by-step heating," balancing heating efficiency and equipment lifespan. The water spray desuperheater is located at the outlet of the low-temperature superheater and is used to coarsely adjust the superheated steam temperature. It reduces the steam temperature by atomizing water and absorbing heat, protecting the subsequent high-temperature superheater pipes as a "safety redundancy" to cope with the risk of steam overheating caused by load fluctuations and fuel changes, and ensuring stable steam parameters. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the installation structure of the external superheater of this utility model; Figure 2 This is a schematic diagram of the internal structure of the external superheater of this utility model; Figure 3This is a diagram of the internal structure of the low-temperature superheater of this utility model.

[0013] In the diagram: 1. Boiler; 11. Steam pipe; 2. External frame; 21. Support frame; 22. Ash removal port; 3. Low-temperature superheater; 31. Serpentine tube; 32. Insulation layer; 33. Inspection door; 4. High-temperature superheater; 5. Water spray desuperheater. Detailed Implementation

[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0015] Please see Figure 1-3 The present invention provides the following technical solution: an external superheater for safe and stable operation of a biomass industrial boiler, including a boiler 1, an external frame 2 is provided on one side of the boiler 1, a support frame 21 is fixedly installed at the bottom of the outer surface of the external frame 2, and a steam pipe 11 is fixedly installed on the outer surface of the boiler 1. In this embodiment, the low-temperature superheater 3 is installed at the bottom of the inner side of the external frame 2. The boiler 1 supplies steam to the interior of the low-temperature superheater 3 through the steam pipe 11. The high-temperature superheater 4 is fixedly installed inside the external frame 2 above the low-temperature superheater 3. A water spray desuperheater 5 is fixedly installed on one side of the low-temperature superheater 3, and the low-temperature superheater 3 and the high-temperature superheater 4 are connected through the water spray desuperheater 5.

[0016] Both the low-temperature superheater 3 and the high-temperature superheater 4 are fixedly installed with serpentine pipes 31 for transporting steam. The saturated steam generated by the steam drum first enters the low-temperature superheater 3 through the steam pipe 11, and is then heated in the first stage by the medium-temperature flue gas from the tail flue of the boiler 1.

[0017] It should also be noted in this embodiment that one end of the water spray desuperheater 5 is fixedly connected to the steam output end of the serpentine tube 31 inside the low-temperature superheater 3. The entire process is carried out by adjusting the flue gas flow and steam temperature through the water spray desuperheater 5 to avoid superheater overheating and creep, and to ensure stable steam parameters.

[0018] In this embodiment, a maintenance door 33 is provided on one side of the shell of the low-temperature superheater 3, and one end of the maintenance door 33 is hinged to the shell of the low-temperature superheater 3. In case of failure, the maintenance door 33 can be opened to facilitate the inspection and maintenance of the internal components. The shell of the low-temperature superheater 3 is provided with a heat insulation layer 32 to reduce the influence of the external environment on the internal steam heating.

[0019] The outer surface of the external frame 2 is provided with a dust removal port 22. A shock wave soot blower is fixedly installed on the outer surface of the external frame 2 on the side corresponding to the dust removal port 22. The shock wave is generated by mixing and burning combustible gases such as acetylene and natural gas with air to remove the accumulated ash and improve the heat exchange efficiency.

[0020] The working principle of this embodiment is as follows: The saturated steam generated by the steam drum first enters the low-temperature superheater 3 through the steam pipe 11. It is heated in the first stage by the medium-temperature flue gas in the tail flue of the boiler 1 to remove residual moisture and raise the temperature, which prepares for high-temperature heating and protects the high-temperature superheater 4 from corrosion by wet steam. Then the steam enters the high-temperature superheater 4 and directly exchanges heat with the high-temperature flue gas at the furnace outlet. The temperature is further raised to the rated steam temperature of the boiler 1. Finally, dry, high-temperature, and high-pressure superheated steam is output. The flue gas flow and steam temperature are regulated by the water spray desuperheater 5 to avoid superheater overheating and creep, and to ensure stable steam parameters. Both the low-temperature superheater 3 and the high-temperature superheater 4 are equipped with a heat insulation layer 32 inside the shell to reduce the influence of the external environment on the internal steam heating. At the same time, an inspection door 33 is provided on one side for easy opening and maintenance. Furthermore, a shock wave soot blower is installed at the corresponding position of the ash removal port 22. The shock wave is generated by the combustion of combustible gases such as acetylene and natural gas with air to remove ash and improve heat exchange efficiency.

[0021] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0022] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An external superheater for the safe and stable operation of a biomass industrial boiler, characterized in that, include: Boiler (1), an external box frame (2) is provided on one side of the boiler (1), a support frame (21) is fixedly installed on the bottom of the outer surface of the external box frame (2), and a steam pipe (11) is fixedly installed on the outer surface of the boiler (1). The low-temperature superheater (3) is installed at the bottom of the inner side of the external frame (2). The boiler (1) supplies steam to the interior of the low-temperature superheater (3) through the steam pipe (11). The high-temperature superheater (4) is fixedly installed inside the external frame (2) above the low-temperature superheater (3). A water spray desuperheater (5) is fixedly installed on one side of the low-temperature superheater (3), and the low-temperature superheater (3) and the high-temperature superheater (4) are connected through the water spray desuperheater (5).

2. An external superheater for the safe and stable operation of a biomass industrial boiler according to claim 1, characterized in that: Both the low-temperature superheater (3) and the high-temperature superheater (4) are fixedly installed with serpentine pipes (31) for conveying steam.

3. An external superheater for the safe and stable operation of a biomass industrial boiler according to claim 2, characterized in that: One end of the water spray desuperheater (5) is fixedly connected to the steam output end of the serpentine tube (31) inside the low-temperature superheater (3).

4. An external superheater for the safe and stable operation of a biomass industrial boiler according to claim 1, characterized in that: The low-temperature superheater (3) has an inspection door (33) on one side of its shell, and one end of the inspection door (33) is hinged to the shell of the low-temperature superheater (3).

5. An external superheater for the safe and stable operation of a biomass industrial boiler according to claim 1, characterized in that: The shell of the low-temperature superheater (3) is provided with a heat insulation layer (32).

6. An external superheater for safe and stable operation of a biomass industrial boiler according to claim 1, characterized in that: The outer surface of the external box frame (2) is provided with a dust removal port (22), and a shock wave soot blower is fixedly installed on the outer surface of the external box frame (2) on the corresponding side of the dust removal port (22).

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