Floating stepped combustion furnace

Abstract

The utility model provides a floating type stepped combustion furnace which comprises a furnace body internally provided with a combustion cavity and an air supply port arranged on the furnace body, one end of the furnace body is provided with a fuel feeding port, the other end of the furnace body is provided with a high-temperature flue gas outlet, and a stepped combustion table is arranged in the furnace body, and is characterized in that the stepped combustion table is formed by a plurality of layers of grid plates which are sequentially staggered and overlapped from top to bottom; a plurality of through holes are formed in the grate plate, and the through holes of the grate plate are connected with external air supply equipment through an air supply assembly. Fuel on the stepped combustion table is raised by gas fed by external air supply equipment through the through holes in the grate plate, so that the material combustion area is increased, the fuel can be uniformly preheated and fully combusted, the fuel combustion value is effectively increased, and emission of harmful substances is reduced.

Description

Technical Field

[0001] The utility model relates to a step combustion furnace, in particular to a floating step combustion furnace, belonging to the technical field of metallurgy and chemical industry. Background Art

[0002] With the continuous improvement of technology and environmental awareness, green and environmentally friendly biomass fuels and RDF fuels have begun to gradually replace traditional fossil fuels for industrial use. Since the combustion characteristics of biomass fuels are different from those of fossil fuels, it is necessary to spread the biomass fuel as flat as possible in the furnace so that a large amount of volatile components are precipitated during combustion to promote combustion. In order to accelerate the precipitation of volatile components, the existing biomass combustion furnace will install a high-temperature flue gas inlet on the top of the furnace body, and preheat the fuel by introducing high-temperature flue gas to quickly precipitate volatile components. However, during use, it was found that high-temperature flue gas can only preheat the surface fuel, and the preheating effect on the bottom fuel is poor. In addition, only the surface fuel is burned during combustion, and the bottom fuel often has problems of incomplete combustion or coking. Not only does it cause a large waste of resources, but incomplete combustion will increase the production of toxic and harmful gases. Therefore, it is necessary to improve the existing technology. Utility Model Content

[0003] In order to solve the problem that the existing biomass combustion furnace can only preheat and burn the surface fuel, resulting in insufficient combustion or coking of the bottom fuel, the utility model provides a floating step combustion furnace.

[0004] The utility model is completed through the following technical solutions: a floating step combustion furnace, including a furnace body with a combustion chamber arranged therein, an air supply port arranged on the furnace body, a fuel feed port arranged at one end of the furnace body, and a high-temperature flue gas outlet arranged at the other end, a stepped combustion platform is arranged in the furnace body, and its characteristic is that the stepped combustion platform is composed of multiple layers of grate plates which are staggered and overlapped in sequence from top to bottom, a plurality of through holes are arranged on the grate plates, and the through holes of the grate plates are connected to external air supply equipment through air supply components, so that the gas sent in by the external air supply equipment through the through holes on the grate plates can float the fuel on the stepped combustion platform, so that the fuel can be evenly preheated and burned, effectively improving the fuel combustion value and reducing the emission of harmful substances.

[0005] The furnace body is configured as a trapezoidal body with a low front and a high rear, which is surrounded by vertical side panels, an inclined top panel and a horizontal bottom panel on all sides. A cavity is provided in the furnace body, and the shape of the cavity is adapted to the shape of the furnace body. The fuel feed port is provided at a high position of the rear end side panel of the shell body, the high-temperature flue gas outlet is provided at a low position of the front end side panel of the shell body, and the air supply port is provided on the rear end top panel of the shell body, wherein the fuel feed port is connected to an external fuel conveying device, the high-temperature flue gas outlet is connected to a cement kiln decomposition furnace, and the air supply port is connected to a tertiary air duct of a cement rotary kiln, so as to introduce air into the combustion furnace to preheat the fuel and improve the fuel combustion efficiency.

[0006] The stepped combustion platform is arranged in the cavity of the furnace body, the cavity above the stepped combustion platform is set as the combustion cavity, the grate plate constituting the stepped combustion platform is set as a horizontal rectangular plate, the front part of the upper grate plate is laid on the rear part of the lower grate plate, the two sides of the grate plate are connected to the inner wall of the furnace body cavity, the grate plate at the highest position is arranged below the fuel feed port and matched with it, the grate plate at the lowest position is arranged behind the high-temperature flue gas outlet, and a plurality of through holes are arranged on the grate plate so that after the fuel enters the furnace body from the feed port, it can be laid on the stepped combustion platform between the fuel feed port and the high-temperature flue gas outlet for preheating and combustion.

[0007] The through holes are arranged as strip holes, which are arranged on the top of the grate plate. A plurality of through holes are arranged in multiple rows from left to right along the top of the grate plate, and a plurality of through holes are arranged in each row from front to back. An air chamber connected to the plurality of through holes is arranged under the grate plate. The air chamber is connected to an air supply assembly so that air can be supplied to the air chamber and the through holes through the air supply assembly, so that the fuel on the grate plate is blown up by the wind and is in a uniform floating state, which is conducive to complete combustion.

[0008] The air supply assembly is arranged in the cavity below the stepped combustion table, and comprises: an upper horizontal tube arranged transversely at the bottom of each layer of grate plate, an air inlet connected to the grate plate wind chamber is opened at the top of the upper horizontal tube, an upper end of the vertical tube connected to the bottom of the upper horizontal tube through an air inlet hole, the lower end of the vertical tube is connected to the longitudinally arranged lower horizontal tube through the air inlet hole, the upper horizontal tube at the tail end is directly connected to the lower horizontal tube through the air inlet hole, the upper horizontal tubes at the head end and the middle are respectively connected to the lower horizontal tube through the corresponding vertical tubes, the vertical tube at the head end is connected to the inner end of the connecting tube through the air inlet hole, and the outer end of the connecting tube is connected to the external air supply equipment after passing through the vertical side plate of the furnace body, so as to supply air to the air chamber below the grate plate through the air supply assembly, and then distribute the gas evenly to each through hole through the air chamber and blow it upward into the combustion chamber, so that the fuel on the grate plate is blown up by the wind and is in a uniform floating state, thereby promoting the complete combustion of the fuel.

[0009] The utility model has the following advantages and effects: by adopting the above scheme, the gas sent in by the external air supply equipment through the through holes on the grate plate floats the fuel on the stepped combustion platform, so that the fuel can be evenly preheated and burned, effectively improving the fuel combustion value and reducing the emission of harmful substances. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a cross-sectional view of the utility model;

[0011] Figure 2 It is a top view of the stepped combustion platform of the present utility model. DETAILED DESCRIPTION

[0012] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model. Example

[0013] The floating step combustion furnace provided by the utility model comprises a furnace body 1 with a combustion chamber 4 therein, an air supply port 9 arranged on the furnace body 1, a fuel feed port 10 is arranged at one end of the furnace body 1, and a high-temperature flue gas outlet 3 is arranged at the other end. A step combustion platform 2 is arranged in the furnace body 1, and the step combustion platform 2 is composed of multiple layers of grate plates 5 which are staggered and overlapped in sequence from top to bottom. The grate plates 5 are provided with a plurality of through holes 6, and the grate plate through holes 6 are connected to an external air supply device through an air supply component, so that the gas sent in by the external air supply device through the through holes 6 on the grate plates 5 floats the fuel on the step combustion platform 2, so that the fuel can be evenly preheated and completely burned, effectively improving the fuel combustion efficiency and reducing the emission of harmful substances;

[0014] The furnace body 1 is a trapezoidal body surrounded by vertical side plates, an inclined top plate, and a horizontal bottom plate, with a low front and a high back. A cavity is provided in the furnace body, and the shape of the cavity is adapted to the shape of the furnace body. A fuel feed port 10 is provided at a high position of a rear end side plate of the shell body 1, a high-temperature flue gas outlet 3 is provided at a low position of a front end side plate of the shell body 1, and an air supply port 9 is provided on the top plate of the shell body 1, wherein the fuel feed port 10 is connected to an external fuel delivery device, the high-temperature flue gas outlet 3 is connected to a cement kiln decomposition furnace, and the air supply port 9 is connected to a tertiary air duct of a cement rotary kiln through a pipeline, so as to introduce tertiary air into the combustion furnace to assist combustion while preheating the fuel to improve fuel combustion efficiency;

[0015] The stepped combustion platform 2 is arranged in the cavity of the furnace body 1, and the cavity above the stepped combustion platform 2 is the combustion cavity 4. The multi-layer grate plates 5 constituting the stepped combustion platform 2 are all set as horizontal rectangular plates. The front part of the upper grate plate 5 is laid on the rear part of the lower grate plate 5, and the two sides of the grate plate 5 are connected to the inner wall of the cavity of the furnace body 1. The grate plate 5 at the highest position is arranged below the fuel feed port 10 and matched therewith, and the grate plate 5 at the lowest position is arranged behind the high-temperature flue gas outlet 3. A plurality of through holes 6 are arranged on the grate plate 5, so that the fuel can be laid on the stepped combustion platform 2 after entering the furnace cavity from the fuel feed port 10;

[0016] The through holes 6 are arranged as strip holes, which are arranged at the top of the grate plate 5. A plurality of through holes 6 are arranged in multiple rows from left to right along the top of the grate plate 5, and a plurality of through holes 6 are arranged in each row from front to back. An air chamber 7 connected with the plurality of through holes 6 is arranged below the grate plate 5. The air chamber 7 is connected to an air supply component, so that air is supplied to the air chamber 7 and the through holes 6 through the air supply component, so that the fuel on the grate plate 5 is blown up by the wind to be in a uniform floating state, which is conducive to complete combustion.

[0017] The air supply assembly is arranged in the cavity below the stepped combustion table 2, and comprises: an upper horizontal tube 11 arranged transversely at the bottom of each layer of the grate plate 5, an air inlet 8 connected to the grate plate air chamber 7 is opened at the top of the upper horizontal tube 11, a vertical tube 12 whose upper end is connected to the bottom of the upper horizontal tube 11 through the air inlet hole, and the lower end of the vertical tube 12 is connected to the longitudinally arranged lower horizontal tube 14 through the air inlet hole, the upper horizontal tube 11 located at the tail end (the side of the high-temperature flue gas outlet 3) is directly connected to the lower horizontal tube 14 through the air inlet hole, and the upper horizontal tube 11 located at the head end (the side of the fuel feed port 10) is directly connected to the lower horizontal tube 14 through the air inlet hole. The upper horizontal tube 11 in the middle is connected with the lower horizontal tube 14 through the corresponding vertical tube 12, the vertical tube 12 located at the head end (the fuel feed port 10 side) is connected with the inner end of the connecting tube 13 through the air inlet hole, and the outer end of the connecting tube 13 passes through the vertical side plate of the furnace body 1 and is connected to the external air supply equipment, so as to supply air to the air chamber 7 under the grate plate 5 through the air supply assembly, and then the gas is evenly distributed to each through hole 6 through the air chamber 7 and blown upward into the combustion chamber 4, so that the fuel on the grate plate 5 is blown up by the wind and is in a uniform floating state, thereby promoting the complete combustion of the fuel.

[0018] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0019] The preferred embodiments of the utility model disclosed above are only used to help explain the utility model. The preferred embodiments do not describe all the details in detail, nor do they limit the utility model to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the utility model, so that technicians in the relevant technical field can well understand and use the utility model. The utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A floating step combustion furnace, comprising a furnace body with a combustion chamber, an air supply port arranged on the furnace body, a fuel feed port at one end of the furnace body, a high-temperature flue gas outlet at the other end, and a step combustion platform arranged in the furnace body, characterized in that The stepped combustion table is composed of multiple layers of grate plates which are overlapped in sequence from top to bottom. The grate plates are provided with a number of through holes, which are connected to external air supply equipment through air supply components. The grate plates constituting the stepped combustion platform are set as horizontal rectangular plates, the front part of the upper grate plate is placed on the rear part of the lower grate plate, and the two sides of the grate plate are connected to the inner wall of the furnace cavity; The air supply assembly is arranged in the cavity below the stepped combustion table, and includes: an upper horizontal tube arranged horizontally at the bottom of each layer of grate plate, an air inlet connected to the grate plate wind chamber is opened at the top of the upper horizontal tube, a vertical tube whose upper end is connected to the bottom of the upper horizontal tube through an air inlet hole, the lower end of the vertical tube is connected to the longitudinally arranged lower horizontal tube through the air inlet hole, the upper horizontal tube at the tail end is directly connected to the lower horizontal tube through the air inlet hole, the upper horizontal tubes at the head end and the middle are respectively connected to the lower horizontal tube through the corresponding vertical tubes, the vertical tube at the head end is connected to the inner end of the connecting tube through the air inlet hole, and the outer end of the connecting tube is connected to the external air supply equipment after passing through the vertical side plate of the furnace body.

2. The floating step combustion furnace according to claim 1 is characterized in that The furnace body is configured as a trapezoidal body with a low front and a high rear, which is surrounded by vertical side panels, an inclined top panel and a horizontal bottom panel. A cavity is provided in the furnace body, and the shape of the cavity is adapted to the shape of the furnace body. The fuel feed port is provided at a high position of the rear end side panel of the shell body, the high-temperature flue gas outlet is provided at a low position of the front end side panel of the shell body, and the air supply port is provided on the rear end top panel of the shell body, wherein the fuel feed port is connected to an external fuel conveying device, the high-temperature flue gas outlet is connected to the cement kiln decomposition furnace, and the air supply port is connected to the tertiary air duct of the cement rotary kiln.

3. The floating step combustion furnace according to claim 1 is characterized in that The stepped combustion platform is arranged in the cavity of the furnace body, the cavity above the stepped combustion platform is set as the combustion chamber, the grate plate at the highest position is arranged below the fuel feed port and matched with it, the grate plate at the lowest position is arranged behind the high-temperature flue gas outlet, and a plurality of through holes are arranged on the grate plate.

4. The floating step combustion furnace according to claim 1 is characterized in that The through holes are arranged as strip holes on the top of the grate plate. A plurality of through holes are arranged in multiple rows from left to right along the top of the grate plate, and a plurality of through holes are arranged in each row from front to back. An air chamber connected to the plurality of through holes is arranged under the grate plate, and the air chamber is connected to the air supply assembly.

Images