Heat insulation hearth equipment with efficient combustion function
By designing an L-shaped insulated furnace and combining it with a primary and secondary air-fuel blending system and an air distribution system, the problems of incomplete combustion and NOx generation were solved, achieving efficient combustion and improved safety. The equipment height was also reduced, making it easier to use in a factory.
Patent Information
- Application Number
- CN202423260969.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-27
- Publication Date
- 2026-01-13
- Estimated Expiration
- 2034-12-27
AI Technical Summary
Traditional insulated furnaces pose safety hazards such as incomplete combustion of fuel gas, excessive equipment height, inadequate mixing of flue gas, and NOx generation, and the equipment is not convenient to place in the factory.
Design a high-efficiency combustion adiabatic furnace device, adopting an L-shaped structure, a primary air-fuel blending system and a secondary air-fuel blending system, combined with an air distribution and combustion system, and setting up denitrification ports and monitoring points. By gas disturbance and denitrification agent injection, NOx is reduced, and combustion efficiency and safety are improved.
It achieves complete combustion of gas, reduces equipment height, facilitates placement in the plant, reduces NOx generation, improves equipment operation safety, and saves on denitrification equipment costs.
Smart Images
Figure CN223795308U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of insulated furnace technology, specifically to an insulated furnace device for high-efficiency combustion. Background Technology
[0002] Insulated furnaces are widely used at the downstream end of biomass / municipal waste pyrolysis gasification furnaces. Their main function is to ensure the complete combustion of combustible gases (CO, H2, CH4, etc.) generated during the pyrolysis gasification process. Simultaneously, the insulated furnace effectively decomposes harmful substances such as dioxins during the high-temperature combustion of municipal solid waste. Therefore, the design of the secondary combustion chamber must adhere to the "3T+E" principle, ensuring an excess of oxygen (air) while maintaining a combustion temperature above 850℃, a residence time of no less than 2 seconds, and sufficiently high turbulence.
[0003] Traditional insulated furnaces suffer from incomplete combustion of fuel gas, posing safety hazards. Furthermore, the overall height of the equipment is too large, making it inconvenient for placement within a factory building. Flue gas enters directly into the furnace without turbulence, hindering proper mixing of fuel gas and air. NOx is generated during combustion and remains in the flue gas. Utility Model Content
[0004] Therefore, this utility model provides an insulated furnace device for high-efficiency combustion to solve the problems existing in the above-mentioned technology.
[0005] To achieve the above objectives, the present invention provides the following technical solution:
[0006] An efficient combustion insulated furnace device includes a furnace body, a primary combustion-air mixing system, a secondary combustion-air mixing system, an air distribution and combustion system, a flue gas outlet, and an ash outlet.
[0007] The bottom of the sidewall of the furnace body extends toward the side away from the furnace body, forming an L-shaped structure. The primary air-fuel mixing system and the secondary air-fuel mixing system are symmetrically arranged at the top of the furnace body. The flue gas outlet is opened at the lower end of the furnace body, and the air distribution and combustion system is arranged on the horizontal structure of the furnace body.
[0008] The ash outlet is located at the bottom of the vertical structure of the furnace body.
[0009] Optionally, the primary air-fuel blending system includes a first air preheating inlet, a first air preheating outlet bend, a first air distribution duct, a first gas inlet duct, and a first air-fuel cyclone vane;
[0010] The secondary air-fuel blending system includes a second air preheating inlet, a second air preheating outlet bend, a second air distribution duct, a second gas inlet duct, and a second air-fuel cyclone vane.
[0011] The first gas inlet pipe and the second gas inlet pipe are both inclinedly arranged on the top of the furnace body and connect the inside and outside of the furnace body. The gas flow direction of the first gas inlet and the gas flow direction of the second gas inlet form convection inside the furnace body.
[0012] Optionally, the furnace body includes castable refractory, insulation layer and steel plate, with the inner layer of the furnace body being castable refractory, the middle layer being insulation layer and the outer layer being steel plate.
[0013] Optionally, the side wall of the furnace body is provided with a denitrification port as a reserved denitrification inlet.
[0014] Optionally, a burner is provided at the top center of the furnace body to assist combustion during the reaction of gas and air.
[0015] Optionally, the side wall of the furnace body is provided with monitoring points, including temperature measuring points and pressure measuring points.
[0016] Optionally, the air distribution and combustion system includes an air distribution belt, a third cyclone vane, and a tertiary air distribution inlet.
[0017] Optionally, the ash outlet includes a conical material gathering section and a discharge port;
[0018] The bottom inner side of the furnace body is designed with a funnel-shaped structure for centralized material discharge.
[0019] Optionally, a manhole is provided on the outer wall of the furnace body, and the manhole is connected to the interior of the furnace body.
[0020] This utility model has at least the following beneficial effects:
[0021] This invention features an L-shaped structure formed by extending the furnace body to one side from the bottom of its sidewall, with the flue gas outlet located on the horizontal structure of the furnace body. This design reduces the height of the equipment to a certain extent, making it easier to place the furnace body inside the factory.
[0022] This invention symmetrically arranges a primary gas-air mixing system and a secondary gas-air mixing system at the top of the furnace body. The first and second gas inlet pipes of the two systems are set at a certain angle to the axial direction of the furnace, that is, the gas flow directions of the first and second gas inlet pipes intersect inside the furnace body, thereby forming convection inside the furnace body and increasing gas disturbance.
[0023] This invention uses a denitrification port located on the side wall of the furnace body to inject a denitrification agent into the furnace body, thereby reducing the NOx content in the flue gas. Attached Figure Description
[0024] To more clearly illustrate the prior art and the present invention, the accompanying drawings used in the description of the prior art and the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are merely exemplary, and those skilled in the art can derive other drawings from the provided drawings without any creative effort.
[0025] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the conditions under which this utility model can be implemented. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and purposes that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model.
[0026] Figure 1 This is a schematic diagram of the internal structure of the furnace body according to an embodiment of the present invention.
[0027] Explanation of reference numerals in the attached figures:
[0028] 1. Furnace body; 11. Castable refractory; 12. Insulation cotton; 13. Steel plate; 2. SNCR denitrification port; 3. Burner; 4. Primary air-fuel blending system; 41. First air preheating inlet; 42. First air preheating outlet bend; 43. First air distribution duct; 44. First gas inlet pipe; 45. First air-fuel cyclone vane; 5. Secondary air-fuel blending system; 51. Second air preheating inlet; 52. Second air preheating outlet bend; 53. Second air distribution duct; 54. Second gas inlet pipe; 55. Second air-fuel cyclone vane; 6. Monitoring point; 61. Temperature measuring point; 62. Pressure measuring point; 7. Air distribution combustion system; 71. Air distribution belt; 72. Third cyclone vane; 73. Third air distribution inlet; 8. Flue gas outlet; 9. Ash outlet; 10. Manhole. Detailed Implementation
[0029] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.
[0030] In the description of this utility model, unless otherwise stated, "a plurality of" means two or more. The terms "first," "second," "third," "fourth," etc. (if present), in the specification, claims, and accompanying drawings of this utility model are intended to distinguish the objects they refer to. For solutions with a sequential flow, this terminology need not be interpreted as describing a specific order or sequence; for solutions with device structures, this terminology does not distinguish between matters of importance or positional relationships.
[0031] Furthermore, the terms “comprising,” “having,” and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units that are expressly listed, but may also include other steps or units that are not expressly listed but are inherent to these processes, methods, products, or devices, or steps or units added based on further optimizations of the inventive concept.
[0032] like Figure 1 As shown, this utility model discloses a high-efficiency combustion insulated furnace device, including a furnace body, a primary combustion-air mixing system 4, a secondary combustion-air mixing system 5, an air distribution and combustion system 7, a flue gas outlet 8, and an ash and slag outlet 9.
[0033] The bottom of the side wall of the furnace body 1 extends toward the side away from the furnace body 1, forming an L-shaped structure. The primary air-fuel mixing system 4 and the secondary air-fuel mixing system 5 are symmetrically arranged at the top of the furnace body 1. The flue gas outlet 8 is opened at the lower end of the furnace body 1, and the air distribution and combustion system 7 is arranged on the horizontal structure of the furnace body 1.
[0034] Ash outlet 9 is located at the bottom of the vertical structure of the furnace body 1.
[0035] The primary air-fuel blending system 4 includes a first air preheating inlet 41, a first air preheating outlet bend 42, a first air distribution duct 43, a first gas inlet pipe 44, and a first air-fuel cyclone vane 45.
[0036] The secondary air-fuel blending system 5 includes a second air preheating inlet 51, a second air preheating outlet bend 52, a second air distribution duct 53, a second gas inlet pipe 54, and a second air-fuel cyclone vane 55.
[0037] The first gas inlet pipe 44 and the second gas inlet pipe 54 are both inclinedly arranged on the top of the furnace body 1 and connect the inside and outside of the furnace body 1. The gas flow direction of the first gas inlet and the gas flow direction of the second gas inlet form convection inside the furnace body 1.
[0038] The aforementioned components include the furnace body 1, SNCR denitrification port 2, burner 3, primary air-fuel blending system 4, secondary air-fuel blending system 5, monitoring point 6, air distribution and combustion system 7, flue gas outlet 8, ash outlet 9, and manhole 10. The outer wall of the furnace body 1 is composed of three layers of material: castable refractory 11, insulation cotton 12, and steel plate 13, from the inside out, to maintain the furnace temperature and prevent heat dissipation into the environment. The furnace body 1 has openings on its sides, with SNCR denitrification port 2 and monitoring point 6 respectively. Injecting denitrification agent into the furnace through denitrification port 2 removes NOx from the high-temperature flue gas, meeting emission standards. Monitoring point 6 includes temperature measuring point 61 and pressure measuring point 62, measuring the internal temperature and pressure of the furnace, and judging the combustion status of the furnace through data changes. The burner 3 is located at the center of the top of the furnace, providing combustion assistance and ignition during the reaction of fuel gas and air. The primary air-fuel mixing system 4 and the secondary air-fuel mixing system 5 are symmetrically arranged at the top center of the furnace body 1. The primary air-fuel mixing system 4 includes a first air preheating inlet 41, a first air preheating outlet bend 42, a first air distribution pipe 43, a first gas inlet pipe 44, and a first air-fuel cyclone vane 45. The secondary air-fuel mixing system 5 includes a second air preheating inlet 51, a second air preheating outlet bend 52, a second air distribution pipe 53, a second gas inlet pipe 54, and a second cyclone vane 55. The preheated air and gas enter the furnace body 1 through the first cyclone vane 45 and the second cyclone vane 55 for complete reaction. The air distribution and combustion system 7 is located in the outlet direction of the flue gas flow and includes an air distribution belt 71, a third cyclone vane 72, and a tertiary air distribution inlet 73. The combusted flue gas and the tertiary air distribution are re-combusted until completely burned. The flue gas outlet 8 is located at the flue gas outlet end, and the gas enters the next equipment / section. The ash outlet 9 is located at the bottom of the furnace body 1, where solid materials such as ash and slag falling from the flue gas are temporarily stored at the bottom of the furnace and then discharged externally. The manhole 10 is located on the outer wall of the furnace body, facilitating regular equipment inspection or maintenance, as well as cleaning accumulated ash and tar on the furnace walls.
[0039] This invention designs the equipment in an "L" shape to reduce its height. Air is supplied from three inlets into the furnace, taking into account the inlet angles of primary and secondary air to increase gas turbulence. An SNCR denitrification port is opened on the side wall of the equipment, allowing denitrification agent to be injected through a pre-reserved port to reduce NOx in the flue gas.
[0040] The working principle of this embodiment is as follows: air enters the preheating space at the top from the insulation layer. When it is preheated to above 200°C, it mixes with the gas through the cyclone vanes and enters the furnace to react. Following the direction of flue gas flow, it mixes with the air again at the position before the flue gas outlet, so that the unburned air is burned again. After three air distributions, the gas is finally completely reacted into flue gas and flows to the outlet.
[0041] The advantages of this utility model are:
[0042] (1) The three-layer material of the furnace body can effectively insulate heat and maintain the temperature inside the furnace, while the temperature of the outer wall of the furnace is within the safe range for personnel operation.
[0043] (2) The setting of the tertiary air distribution inlet can not only make the gas fully combustible and improve the safety of equipment operation; but also the primary air distribution and secondary air distribution enter the furnace at a certain angle to form a counter-current, thereby causing airflow disturbance and increasing the reaction degree.
[0044] (3) The air passes through the insulation layer and then mixes with the gas before entering the furnace, which can preheat the air to above 200°C, so that it can fully react with the gas and the tar in it, thus avoiding the tar from condensing on the furnace wall.
[0045] (4) The equipment can remove nitrogen oxides generated by pyrolysis and combustion at the same time, realizing integrated denitrification and saving the cost of separate denitrification equipment.
[0046] (5) The front end of the equipment can be connected to a gasifier, and the generated gas is directly sent into the secondary combustion chamber through the flue. The rear end can be connected to a waste heat boiler to utilize the waste heat of the high-temperature flue gas.
[0047] The above specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments.
[0048] The technical features of the above embodiments can be combined in any way (as long as there is no contradiction in the combination of these technical features). For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described; these embodiments not explicitly written should also be considered to be within the scope of this specification.
[0049] The present invention has been described in a relatively specific and detailed manner above through general description and specific embodiments. It should be noted that, without departing from the concept of the present invention, various modifications and improvements can be made to these specific embodiments, all of which fall within the scope of protection of this application. Therefore, the scope of protection of this patent application should be determined by the appended claims.
Claims
1. A high efficiency, combustion, adiabatic hearth apparatus characterized by: The furnace body, the primary air-blend system, the secondary air-blend system, the air distribution combustion system, the flue gas outlet and the ash outlet; The bottom of the side wall of the furnace body extends towards the side away from the furnace body, forming an L-shaped structure, and the primary air-blend system and the secondary air-blend system are symmetrically arranged at the top end of the furnace body; the flue gas outlet is arranged at the lower end of the furnace body, and the air distribution combustion system is arranged on the horizontal structure of the furnace body; The ash outlet is arranged at the bottom of the vertical structure of the furnace body.
2. A high efficiency, combustion, adiabatic chamber apparatus according to claim 1, wherein: The primary air-blend system comprises a first air preheating inlet, a first air preheating outlet elbow, a first air distribution pipeline, a first gas inlet pipeline and a first air-cyclone piece; The secondary air-blend system comprises a second air preheating inlet, a second air preheating outlet elbow, a second air distribution pipeline, a second gas inlet pipeline and a second air-cyclone piece; The first gas inlet pipeline and the second gas inlet pipeline are arranged in parallel on the top of the furnace body and communicate inside and outside the furnace body, and the gas flow directions of the first gas inlet and the second gas inlet form a convection inside the furnace body.
3. A high efficiency, combustion, adiabatic chamber apparatus as defined in claim 1, wherein: The furnace body comprises castable, insulation layer and steel plate, the inner layer of the furnace body is castable, the middle layer is insulation layer, and the outer layer is steel plate.
4. A high efficiency, combustion, adiabatic chamber apparatus as defined in claim 1, wherein: The side wall of the furnace body is provided with a denitration port as a reserved denitration inlet.
5. A high efficiency, combustion, adiabatic, hearth apparatus according to claim 1, wherein: A burner is arranged at the center of the top of the furnace body for combustion supporting when the gas and air react.
6. A high efficiency, combustion, adiabatic, hearth apparatus according to claim 1, wherein: The side wall of the furnace body is provided with monitoring points, including temperature measuring points and pressure measuring points.
7. A high efficiency, combustion, adiabatic, hearth apparatus according to claim 1, wherein: The air distribution combustion system comprises air distribution air belt, third cyclone piece and third air distribution inlet.
8. A high efficiency, combustion, adiabatic chamber apparatus according to claim 1, wherein: The ash outlet comprises a conical material collecting part and a discharge port; The inside bottom of the furnace body is provided with a funnel-shaped structure for centralized discharge.
9. A high efficiency, combustion, adiabatic, hearth apparatus according to claim 1, wherein: A manhole is arranged on the outside wall of the furnace body, which communicates with the inside of the furnace body.