Furnace arch structure suitable for biomass grate furnace

Abstract

The utility model discloses a furnace arch structure suitable for a biomass grate furnace, which belongs to the technical field of biomass energy utilization, is arranged on a biomass boiler grate and comprises a plurality of smoke-proof baffles, the smoke-proof baffles form a closed furnace arch around and above the grate, and waste caused by dissipation of heat carried by smoke is prevented. And a cooling device is arranged in the smoke-proof baffle plate. The furnace arch structure suitable for the biomass grate furnace can effectively solve the problems that in the prior art, due to the fact that a furnace arch lacks an effective cooling mechanism, a metal framework in the furnace arch is prone to oxidation reaction and even melts when the metal framework reaches the melting point; and the high-temperature environment also causes the phenomena of cracking, peeling, delaminating and the like of the castable layer, so that the damage of the furnace arch is further aggravated.

Description

Technical Field

[0001] This utility model belongs to the field of biomass energy utilization technology. Specifically, it relates to a furnace arch structure suitable for biomass grate furnaces. Background Technology

[0002] In the combustion process of biomass grate furnaces, fuel is not burned directly in the furnace area, but is evenly distributed onto the grate by a feeding device, forming an accumulation or suspension combustion mode. To effectively prevent high-temperature flue gas from carrying away a large amount of heat and escaping to the outside, causing energy waste and environmental pollution, a closed furnace arch structure is usually installed around and above the grate. This furnace arch design not only helps maintain a high-temperature environment inside the furnace and promotes complete fuel combustion, but also reduces heat loss and improves thermal efficiency.

[0003] However, existing furnace arch structures mostly employ welded metal frames within metal lining plates, with multiple layers of cast-in-place refractory as the internal insulation layer. While this structure meets the sealing and insulation requirements of the furnace arch to some extent, under the long-term scouring of high-temperature flue gas, the internal metal frame is prone to oxidation, even reaching its melting point and melting, severely affecting the structural stability and service life of the furnace arch. Simultaneously, the high-temperature environment also causes cracking, peeling, and delamination of the cast-in-place refractory layer, further exacerbating damage to the furnace arch and increasing maintenance costs and downtime. Furthermore, traditional furnace arch structures lack effective cooling mechanisms, failing to effectively reduce the internal temperature of the furnace arch, accelerating material aging and damage. Additionally, the inability to effectively recover and utilize heat also results in energy waste.

[0004] Therefore, developing a new type of furnace arch structure that can maintain structural stability, extend service life, and effectively recover and utilize heat under high-temperature environments is of great significance for improving the overall performance and economic benefits of biomass grate furnaces. Utility Model Content

[0005] The purpose of this utility model is to address the aforementioned shortcomings by providing a furnace arch structure suitable for biomass grate furnaces. This solves the problems of existing furnace arches lacking an effective cooling mechanism, leading to easy oxidation of the internal metal skeleton, even melting at its melting point; and high-temperature environments causing cracking, peeling, and delamination of the castable refractory layer, further exacerbating furnace arch damage. To achieve the above objectives, this utility model provides the following technical solution:

[0006] A furnace arch structure suitable for biomass grate furnaces is installed on the grate of a biomass boiler, including several smoke baffles. The smoke baffles form a closed furnace arch around and above the grate to prevent the flue gas from carrying heat away and causing waste; the smoke baffles are equipped with cooling devices.

[0007] The smoke baffle includes a metal protective plate; several casting layers are built on the metal protective plate, and the casting layers are connected tightly in sequence.

[0008] A metal frame is welded onto the metal protective plate; the metal frame passes through several casting layers.

[0009] The cooling device includes cooling pipes; cooling pipes are arranged in each casting layer.

[0010] The cooling pipe is provided with a fixed bracket; the fixed bracket is welded to the metal frame.

[0011] The cooling pipes in each pouring layer include two serpentine pipes arranged side by side, with the inlet and outlet of the two serpentine pipes located on the same side.

[0012] The inlet of the serpentine pipe is connected to a cooling device, and the outlet is connected to a main combustion secondary air duct.

[0013] The plurality of the cast-in-place layers are one, two, or three of the following: refractory bricks, refractory castables, and ceramic fiber materials.

[0014] The beneficial effects of this utility model are:

[0015] This invention relates to a furnace arch structure suitable for biomass grate furnaces. The arch is constructed with a cast-in-place layer composed of refractory bricks, refractory castable, and ceramic fiber materials, improving its stability and service life. Furthermore, serpentine pipes are installed within each cast-in-place layer, and cold air is circulated through these pipes for cooling, preventing cracking, peeling, and delamination of the cast-in-place layer. This also cools the metal frame and supporting structures, preventing oxidation or even melting, which could lead to structural instability. This invention effectively cools the temperature within the cast-in-place layer, thereby increasing the overall service life of the furnace arch. Simultaneously, the heated air is reused in the main combustion secondary air duct, preventing heat waste. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model;

[0017] In the attached diagram: 1. Metal protective plate; 2. Cast-in-place layer; 3. Cooling pipe fittings; 4. Fixed bracket. Detailed Implementation

[0018] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0019] It should be noted that similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the figures, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance. In addition, the terms "horizontal," "vertical," etc., do not indicate that the component is required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted. In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" 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 mechanical connection or an electrical 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 utility model based on the specific circumstances.

[0020] Example 1:

[0021] See attached Figure 1This embodiment provides a furnace arch structure suitable for biomass grate furnaces, installed inside the grate of a biomass boiler to prevent heat loss due to heat carried away by flue gas. It includes multiple smoke-proof baffles, forming a closed structure around and above the grate. Each smoke-proof baffle includes a metal protective plate 1 with multiple cast-in-place layers 2 forming an insulation structure. The material of the cast-in-place layers 2 can be one or more of refractory bricks, refractory castables, and ceramic fiber materials. Preferably, starting from one side of the metal protective plate 1, a layer of ceramic fiber material is used to form a cast-in-place layer 2, then a layer of refractory castable is used to form a cast-in-place layer 2, and finally a layer of refractory bricks is used to form a cast-in-place layer in contact with the high-temperature flue gas. The arrows in the attached diagram indicate the flow direction of the high-temperature flue gas.

[0022] To ensure the stability of each pouring layer 2, a metal frame is welded onto the metal baffle. The metal frame passes through each pouring layer 2 and is poured directly onto the metal frame during pouring. Multiple metal frames can be evenly arranged on the metal protective plate 1 to improve the overall structural stability of the pouring layer 2.

[0023] As an enclosed combustion zone, the furnace arch is constantly subjected to the scouring of high-temperature flue gas without cooling. Under harsh high-temperature operating conditions, its internal framework may oxidize or even melt, and the castable refractory layer may crack, peel, or delaminate. To further address this, cooling pipes 3 are installed to cool the interior of the castable layer 2. Preferably, cooling pipes 3 are installed in each castable layer 2, and the material of the cooling pipes 3 is also made of refractory and high-temperature resistant material. The opening of the cooling pipes 3 is connected to a cooling device, which uses a cold air fan to provide cold air as the cooling medium, further ensuring that the heat carried by the cooling medium after heat absorption is not wasted. The outlet of the cooling pipes 3 is connected to the main combustion secondary air. The main combustion secondary air refers to the hot air that is sent into the furnace through a separate channel of the burner during the boiler combustion process. Its main function is to provide oxygen for carbon combustion, enhance airflow turbulence, promote the recirculation of high-temperature flue gas, thereby promoting the mixing of combustibles and oxygen, and providing conditions for complete combustion.

[0024] To ensure uniform cooling within each pouring layer 2, two cooling pipes 3 are installed in each pouring layer 2. The two cooling pipes 3 are arranged side by side in the pouring layer 2, with two openings at the same position serving as the inlet and outlet of the two cooling pipes 3, respectively. This ensures uniform cooling within the same pouring layer 2, effectively preventing oxidation or even melting of the metal skeleton, and also effectively preventing cracking, peeling, and delamination of the castable layer.

[0025] The cooling pipe 3 is set as a serpentine pipe with multiple bends. The serpentine pipe can expand the effective heat exchange area and can come into contact with the casting layer 2 over a large area, thereby improving the heat exchange capacity and quickly cooling down the casting layer 2.

[0026] The preferred cooling pipe 3 can be set at the boundary between adjacent casting layers 2, which can reduce the number of cooling pipes 3. At the same time, the cooling pipe 3 at the boundary also plays a certain connecting role after the casting is completed, connecting the two adjacent casting layers 2. Together with the metal frame and fixed support 4, it can improve the structural stability of the casting layer 2, thereby extending the service life of the furnace arch and ensuring that heat is not wasted.

[0027] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural or procedural transformations made based on the content of the present utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present utility model.

Claims

1. A furnace arch structure suitable for biomass grate furnaces, installed on the grate of a biomass boiler, characterized in that: It includes several smoke baffles, which form a closed furnace arch around and above the grate to prevent the flue gas from carrying heat away and causing waste; the smoke baffles are equipped with cooling devices; the smoke baffles include metal guard plates (1); several casting layers (2) are built on the metal guard plates (1), and the casting layers (2) are connected tightly in sequence; a metal skeleton is welded on the metal guard plates (1); the metal skeleton passes through the casting layers (2); the cooling device includes cooling pipes (3); each casting layer (2) is equipped with cooling pipes (3); the cooling pipes (3) in each casting layer (2) include two serpentine pipes arranged side by side, with the inlet and outlet of the two serpentine pipes arranged on the same side.

2. The furnace arch structure suitable for biomass grate furnaces according to claim 1, characterized in that: The cooling pipe (3) is provided with a fixed bracket (4); the fixed bracket (4) is welded to the metal frame.

3. The furnace arch structure suitable for biomass grate furnaces according to claim 1, characterized in that: The inlet of the serpentine pipe is connected to a cooling device, and the outlet is connected to a main combustion secondary air duct.

Images