A porous media combustion system

Abstract

This utility model relates to the field of porous media combustion technology, specifically a porous media combustion system. It includes a shell, a combustion section, and a porous media heat-releasing section. The porous media heat-releasing section is fixed to the top of the shell, serving as a heat-releasing body and a flue gas exhaust channel. The combustion section includes a combustion chamber, burners, a combustible gas pipeline, and an auxiliary combustion gas pipeline. Multiple burners are connected in series via pipelines and installed inside the shell. The burners are connected to the combustion chamber, which is located below the porous media heat-releasing section. The burners are connected to the combustible gas pipeline, and the combustion chamber is connected to the auxiliary combustion gas pipeline. The system has a simple structure, low cost, and can significantly reduce or avoid backfire in porous media combustion systems, while also possessing high power density and temperature-stable combustion capabilities.

Description

Technical Field

[0001] This utility model relates to the field of porous media combustion technology, specifically a porous media combustion system. Background Technology

[0002] Porous media combustion is a combustion method that incorporates porous media into the burner. Burners with porous media achieve more uniform temperatures and maintain a more stable temperature gradient in the combustion zone due to the presence of convection, conduction, and radiation heat transfer. This results in stable combustion and higher volumetric heat intensity. Compared to free-space combustion, premixed gas combustion in porous media offers advantages such as higher power density, wider adjustment range, lower pollutant emissions, and a more compact structure.

[0003] Generally, porous media burners premix combustion gas and oxidizing gases such as air before introducing them into the burner. For combustion of premixed gas within a porous medium, unstable phenomena such as flameout and backfire may occur during combustion wave propagation. Excessive residence time of the premixed gas in a large cavity may also lead to backfire hazards. Current technologies typically employ methods such as detectors to monitor the flame front within the porous medium, adjusting the ratio of combustion gas and oxidizing gases as needed to prevent flameout and backfire.

[0004] Chinese patent document CN202410243987.3 discloses a "porous media combustion system," which includes a shell, a heat exchanger, and a burner. The control components of this system can adjust the flow rate ratio of coal mine exhaust air based on the position of the combustion wave, thereby regulating the heat exchange intensity of the exhaust air and effectively improving the stability and safety of coal mine exhaust air combustion. However, the combustion wave position tracking system is complex in structure and expensive, limiting its widespread application. Utility Model Content

[0005] To overcome the shortcomings of the prior art, this utility model provides a porous media combustion system with simple structure and low cost, which can significantly reduce or avoid the backfire phenomenon of porous media combustion systems, while also having high power density temperature-controlled combustion capability.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A porous media combustion system includes a shell, a combustion section, and a porous media heat-releasing section. The porous media heat-releasing section is fixed to the top of the shell and serves as a heat-releasing body and a flue gas exhaust channel. The combustion section includes a combustion chamber, burners, a combustible gas pipeline, and an auxiliary combustion gas pipeline. Multiple burners are connected in series through pipelines and installed inside the shell. The burners are connected to the combustion chamber, which is located below the porous media heat-releasing section. The burners are connected to the combustible gas pipeline, and the combustion chamber is connected to the auxiliary combustion gas pipeline.

[0008] Furthermore, the outer shell of the casing is a metal shell, and the inner shell is a refractory material structural layer.

[0009] Furthermore, the plurality of burners are evenly distributed below the porous medium heat dissipation section.

[0010] Furthermore, the spacing between the multiple burners is 20–50 mm, and the power density is 1.00–1.65 MW / m³. 2 .

[0011] Furthermore, the combustible gas pipeline is a coal gas pipeline.

[0012] Furthermore, the gas pipeline is connected to a gas source, and a gas filter screen is provided at the gas inlet located outside the casing.

[0013] Furthermore, the porous medium heat-dissipating section is constructed from porous silicon carbide or foamed silicon carbide.

[0014] Compared with the prior art, the present invention has at least the following technical effects or advantages:

[0015] 1. Less prone to backfire. Traditional porous media burners are highly susceptible to backfire, have complex control systems, and high equipment costs. In this invention, the porous media heat-releasing section is fixed to the top of the shell, serving as both the heat-releasing body and the flue gas exhaust channel. Multiple burners are connected in series via pipes, and the burners are connected to the combustion chamber, which is located below the porous media heat-releasing section. The burners are connected to combustible gas pipes, and the combustion chamber is connected to combustion-supporting gas pipes. In this invention, the combustible gas and combustion-supporting gas are mixed within the combustion chamber, eliminating the need for pre-mixing. Stable combustion of coke oven gas or mixed gas can be achieved directly at the burners within the combustion chamber. The porous media heat-releasing section only serves as the heat-releasing body and the flue gas exhaust channel, minimizing interference with flame combustion. This avoids the potential backfire hazard caused by prolonged residence of the mixed gas in a large cavity, as well as backfire problems caused by internal combustion within the porous media material.

[0016] 2. High heating efficiency and significant gas savings. The flame combustion here can rapidly heat the porous medium heat release section to 1100-1500℃ with virtually no open flame combustion. The porous medium heat release section can release heat at a radiation rate of 55%-70%, which can quickly heat objects such as thin steel plates. Compared with traditional heating burners, it can save 20%-50% of gas.

[0017] 3. Not prone to clogging. Coke oven gas and mixed gas often contain viscous substances such as residual tar. When used in porous media combustion systems, these substances can easily clog the pores within the porous media, leading to a sharp decrease in combustion capacity and frequent backfire and flameout phenomena, which severely limits the application effect of porous media combustion systems.

[0018] A gas filter screen is embedded in the gas inlet channel and is replaced regularly to remove tar and other sticky substances from coke oven gas or mixed gas, prevent gas from clogging the gas burner, and ensure gas delivery efficiency and combustion efficiency. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of this utility model.

[0020] In the diagram: 1. Shell; 2. Combustion section; 3. Porous medium heat release section; 11. Metal shell; 12. Refractory material structural layer; 21. Combustion chamber; 22. Burner; 23. Gas pipeline; 24. Combustion-supporting gas pipeline; 25. Gas filter. Detailed Implementation

[0021] The embodiments of this utility model are described in detail below. To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this utility model or its application or use. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0022] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0023] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" 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 utility model based on the specific circumstances.

[0024] In the description of this utility model, it should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this utility model. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0025] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0026] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0027] like Figure 1 As shown, a porous medium combustion system includes a housing 1, a combustion section 2, and a porous medium heat release section 3, wherein the combustion section and the porous medium heat release section are installed inside the housing 1.

[0028] The outer shell of the shell 1 is a metal shell 11, and the inner shell is a refractory material structural layer 12.

[0029] The porous medium heat dissipation part 3 is constructed of porous silicon carbide or foamed silicon carbide, and has an operating temperature of 1100 to 1500°C. The porous medium heat dissipation part 3 is installed inside the shell 1 and is located at the top of the shell 1, serving as a heat dissipation body and a flue gas exhaust channel.

[0030] The combustion section 2 includes a combustion chamber 21, burners 22, a gas pipeline 23, and a combustion-supporting gas pipeline 24. In this embodiment, a total of seven burners 22 are provided. These seven burners 22 are connected in series via pipelines and installed inside the housing 1. The seven burners 22 are evenly spaced below the porous medium heat release section 3, with a burner spacing of 20–50 mm and a power density of 1.00–1.65 MW / m³. 2 .

[0031] Each burner 22 is surrounded by a combustion chamber 21, which is connected to the porous medium heat release section 3 and located at the bottom of the porous medium heat release section 3. Each combustion chamber 21 is connected to a combustion-supporting gas pipeline 24 through a pipe, and the combustion-supporting gas pipeline 24 is connected to a combustion-supporting gas source.

[0032] The flame combustion here can rapidly heat the porous medium heat release section 3 to 1100-1500℃, and there is basically no open flame combustion. The porous medium heat release section 3 can release heat at a radiation ratio of 55%-70%, which can quickly heat objects such as thin steel plates. Compared with the heat exchange method of traditional heating burners that are mainly based on convection heat exchange, it can save 20%-50% of gas.

[0033] The gas pipeline 23 is connected to the gas source, and a gas filter 25 is installed at the gas inlet located outside the casing. Coke oven gas and mixed gas often contain residual tar and other viscous substances, which can easily clog the pores in the porous media when used in a porous media combustion system, leading to a sharp decrease in combustion capacity and frequent backfire and flameout, severely limiting the application effect of the porous media combustion system. A gas filter 25 is embedded in the gas inlet channel and replaced regularly to remove tar and other viscous substances from the coke oven gas or mixed gas, preventing gas from clogging the gas burner and ensuring gas delivery efficiency and combustion efficiency.

[0034] The porous medium heat-releasing section 3 of this invention is basically not used as a flame combustion area. Stable combustion of coke oven gas or mixed gas can be achieved only at the burner 22 in the combustion chamber 21. The porous medium heat-releasing section 3 only exists as a heat-releasing body and flue gas exhaust channel, which has little interference with flame combustion. It avoids the risk of backfire that may occur if the mixed gas stays in a large cavity for too long. Therefore, it will not cause backfire or flameout caused by the combustion of gas inside the porous medium.

[0035] This invention has a simple structure and low cost, and can significantly reduce or avoid backfire in porous media combustion systems, while also possessing high power density and temperature-controlled combustion capabilities.

[0036] The scope of protection of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this utility model, based on the technical solution and inventive concept of this utility model, shall be included within the scope of protection of this utility model.

Claims

1. A porous media combustion system, characterized in that: It includes a shell, a combustion chamber, and a porous medium heat dissipation chamber; The porous medium heat-releasing part is fixed to the top of the shell, serving as a heat-releasing body and a flue gas exhaust channel; The combustion section includes a combustion chamber, a burner, a combustible gas pipeline, and a combustion-supporting gas pipeline; Multiple burners are connected in series through pipes and installed inside the housing. The burners are connected to the combustion chamber, which is located below the porous medium heat release section. The burner is connected to the combustible gas pipeline, and the combustion chamber is connected to the combustion-supporting gas pipeline.

2. The porous media combustion system according to claim 1, characterized in that: The outer shell of the casing is a metal shell, and the inner shell is a refractory material structural layer.

3. The porous media combustion system according to claim 1, characterized in that: The plurality of burners are evenly distributed below the porous medium heat dissipation section.

4. The porous media combustion system according to claim 3, characterized in that: The spacing between the multiple burners is 20–50 mm, and the power density is 1.00–1.65 MW / m³. 2 .

5. A porous media combustion system according to claim 1, characterized in that: The combustible gas pipeline is a coal gas pipeline.

6. A porous media combustion system according to claim 5, characterized in that: The gas pipeline is connected to a gas source, and a gas filter screen is installed at the gas inlet located outside the casing.

7. A porous media combustion system according to claim 1, characterized in that: The porous medium heat-dissipating section is constructed of porous silicon carbide or foamed silicon carbide.

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