Single-bed single-return sub-fluidized furnace for sludge incineration

Abstract

This utility model discloses a single-bed, single-return fluidized bed furnace for sludge incineration, comprising a furnace chamber, a cyclone dust collector, and a flue. The furnace chamber has a cylindrical structure, with its upper end connected to the cyclone dust collector via a square-to-round joint. The top output end of the cyclone dust collector is connected to the flue. An igniter is installed at the bottom of the furnace chamber, and a screw conveyor feeder is connected to the bottom side of the furnace chamber. A preheater is installed in the flue, with a blower connected to its input end and a three-way distribution valve connected to its output end. The two output ends of the distribution valve are used to receive primary and secondary air inputs, respectively. At least two annular air distribution pipes are installed on the upper outer side of the furnace chamber, and multiple air inlet pipes are evenly arranged along the circumference on the inner side of the air distribution pipes, with the inner ends of the air inlet pipes extending into the furnace chamber. Secondary air is blown into the upper part of the furnace chamber in a swirling jet manner and mixed with combustible air, resulting in high uniformity and completeness of mixing. This fluidized bed is beneficial for improving the stability and completeness of sludge combustion.

Description

Technical Field

[0001] This utility model relates to the field of incinerator technology, specifically a single-bed single-return fluidized bed furnace for sludge incineration. Background Technology

[0002] Sludge incineration is a treatment method that reduces and renders sludge harmless through high-temperature incineration. Its core lies in controlling parameters such as temperature, residence time, and oxygen supply to decompose organic matter. After drying, the sludge's moisture content is reduced to 80%-90%. It is then heated to over 850℃ in the incinerator, where organic matter decomposes into carbon dioxide and water, while inorganic matter forms ash. Bubbling fluidized bed incinerators are gas-solid fluidization devices that operate at apparent gas velocities 2-3 times lower than the critical fluidization velocity. Their structure consists of a lower dense phase zone and an upper dilute phase zone. Due to the low calorific value of sludge, existing fluidized bed incinerators suffer from unstable combustion. Utility Model Content

[0003] The purpose of this invention is to provide a single-bed, single-return fluidized bed furnace for sludge incineration, in order to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a single-bed, single-return fluidized bed furnace for sludge incineration, comprising a furnace chamber, a cyclone dust collector, and a flue. The furnace chamber is a cylindrical structure, with its upper end connected to the cyclone dust collector via a square-to-round joint. The top output end of the cyclone dust collector is connected to the flue. An igniter is installed at the bottom of the furnace chamber. A screw conveyor feeder is connected to the bottom side of the furnace chamber. A preheater is installed in the flue. The input end of the preheater is connected to a blower. The output end of the preheater is connected to a three-way distribution valve. The two output ends of the distribution valve are respectively used to receive primary air and secondary air inputs. At least two annular air distribution pipes are installed on the upper outer side of the furnace chamber. Multiple air inlet pipes are evenly arranged along the circumference of the inner side of the air distribution pipes, and the inner ends of the air inlet pipes extend into the furnace chamber.

[0005] Preferably, the lower end of the cyclone dust collector is connected to the furnace through a return material mechanism.

[0006] Preferably, the air inlet pipe forms a certain angle with the radial direction of the furnace, and the secondary air forms a swirling flow in the upper part of the furnace.

[0007] Preferably, the bottom of the furnace is provided with an air distribution plate, and columnar air caps are evenly distributed on the air distribution plate.

[0008] Compared with the prior art, the beneficial effects of this utility model are as follows: the incoming air is first heated by the preheater in the flue, and then divided into primary air and secondary air by the distribution valve for combustion. The secondary air is blown into the upper part of the furnace in the form of a swirling jet to mix with the combustible air. The uniformity and completeness of the mixing are high. In summary, this utility model is conducive to improving the stability and completeness of sludge combustion. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the structure of this utility model;

[0010] Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure at point AA.

[0011] In the diagram: 1. Furnace; 2. Screw feeder; 3. Ignition device; 4. Connector; 5. Cyclone dust collector; 6. Flue; 7. Preheater; 8. Blower; 9. Distribution valve; 10. Air distribution pipe; 11. Air inlet pipe. Detailed Implementation

[0012] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0013] Please see Figure 1-2 This utility model provides a technical solution: a single-bed, single-return subfluidized bed furnace for sludge incineration, comprising a furnace chamber 1, a cyclone dust collector 5, and a flue 6. The bottom of the furnace chamber 1 is equipped with an air distribution plate, on which columnar air caps are evenly distributed. The furnace chamber 1 has a cylindrical structure, with its upper end connected to the cyclone dust collector 5 via a square-to-round connector 4. The top output end of the cyclone dust collector 5 is connected to the flue 6, and the lower end of the cyclone dust collector 5 is connected to the furnace chamber 1 via a return material mechanism, ensuring complete combustion of the flying dust particles through multiple cycles. An igniter 3 is installed at the bottom of the furnace chamber 1, and a screw conveyor feeder 2 is connected to the bottom side of the furnace chamber 1. Multiple screw conveyors 2 can be installed and distributed around the furnace chamber 1.

[0014] A preheater 7 is installed in the flue 6. The input end of the preheater 7 is connected to a blower 8, and the output end of the preheater 7 is connected to a three-way distribution valve 9. The two output ends of the distribution valve 9 are used to connect to the primary air and secondary air inputs, respectively. The ratio of primary air and secondary air volume can be controlled as needed. Preheating the combustion air helps to improve combustion stability and burnout. At least two annular air distribution pipes 10 are installed on the upper outer side of the furnace 1. Multiple air inlet pipes 11 are evenly arranged along the circumference on the inner side of the air distribution pipes 10, and the inner end of the air inlet pipes 11 extends into the furnace 1. The air inlet pipes 11 form a certain angle with the radial direction of the furnace 1. The secondary air forms a swirling flow in the upper part of the furnace 1. The secondary air adopts a swirling jet method, which can make the air and combustible gas fully and evenly mixed, improving the completeness of combustion. A single-bed single-return sub-fluidized bed furnace refers to a single furnace 1 equipped with a single cyclone dust collector 5. Sub-fluidization means that the velocity is lower than that of conventional fluidization.

[0015] 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. A single-bed, single-return subfluidized bed furnace for sludge incineration, comprising a furnace chamber (1), a cyclone dust collector (5), and a flue (6), wherein the furnace chamber (1) is a cylindrical structure and its upper end is connected to the cyclone dust collector (5) via a square-to-round connector (4), the top output end of the cyclone dust collector (5) is connected to the flue (6), an igniter (3) is installed at the bottom of the furnace chamber (1), and a screw conveyor (2) is connected to the bottom side of the furnace chamber (1), characterized in that: A preheater (7) is installed in the flue (6). The input end of the preheater (7) is connected to a blower (8). The output end of the preheater (7) is connected to a three-way distribution valve (9). The two output ends of the distribution valve (9) are respectively used to connect the primary air and the secondary air input. At least two annular air distribution pipes (10) are installed on the upper outer side of the furnace (1). Multiple air inlet pipes (11) are evenly arranged along the circumference on the inner side of the air distribution pipes (10). The inner end of the air inlet pipes (11) extends into the furnace (1).

2. The single-bed, single-return fluidized bed furnace for sludge incineration according to claim 1, characterized in that: The lower end of the cyclone dust collector (5) is connected to the furnace (1) through a return material mechanism.

3. A single-bed, single-return fluidized bed furnace for sludge incineration according to claim 1, characterized in that: The air inlet pipe (11) forms a certain angle with the radial direction of the furnace (1), and the secondary air forms a swirling flow in the upper part of the furnace (1).

4. A single-bed, single-return fluidized bed furnace for sludge incineration according to claim 1, characterized in that: The bottom of the furnace (1) is provided with an air distribution plate, and columnar air caps are evenly distributed on the air distribution plate.

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