Chain boiler secondary air distribution device

Abstract

A chain boiler secondary air distribution device, including boiler body 1 and dust collector 2, boiler body 1 lower part is provided with fire grate 3, boiler body 1 exhaust gas outlet is communicated with the air inlet of dust collector 2 through exhaust pipe 4, the import end side wall of boiler body 1 is provided with a group of secondary fan 5, the air inlet of secondary fan 5 is communicated with exhaust pipe 4 through return air pipe 6;The advantages are: utilize the exhaust heat energy, reduce the oxygen content of combustion, control the furnace temperature, reduce the generation of nitrogen oxides.

Description

Technical Field

[0001] This utility model relates to the field of chain grate furnaces, specifically to a secondary air distribution device for chain grate furnaces. Background Technology

[0002] Currently, chain grate furnaces are common mechanized stoker combustion equipment in the industrial boiler field, named for their chain-type crawler grate structure. They use a reducer to drive the grate rotation, allowing coal to burn from the front to the back. Equipped with an air-cooling system to protect the grate bars, they offer stable combustion and high thermal efficiency. However, existing chain grate furnaces experience high temperatures during combustion, generating large amounts of nitrogen oxides, thus requiring sophisticated exhaust gas treatment processes. Utility Model Content

[0003] The purpose of this utility model is to address the above-mentioned shortcomings by providing a secondary air distribution device for a chain grate furnace.

[0004] This utility model includes a boiler body and a dust collector. A grate is provided at the bottom of the boiler body. The exhaust outlet of the boiler body is connected to the air inlet of the dust collector through an exhaust pipe. The feature is that a set of secondary air fans is provided on the side wall of the inlet end of the boiler body. The air inlet of the secondary air fans is connected to the exhaust pipe through a return air pipe. An air supply pipe is connected to the air outlet of the secondary air fans. The air supply pipe is installed inside the grate. A set of exhaust holes is opened at the top of the air supply pipe.

[0005] The exhaust pipe consists of a bottom horizontal pipe, a vertical pipe, and a top horizontal pipe. The bottom horizontal pipe is connected to the exhaust outlet of the boiler body, and the top horizontal pipe is connected to the inlet of the dust collector.

[0006] The return gas pipe is an L-shaped pipe, which is installed on one side of the boiler body via a pipe support.

[0007] The outlet end of the return air duct is equipped with a set of branch return air pipes, which are connected to the corresponding secondary air fan inlets.

[0008] A return gas inlet is provided on the top horizontal pipe, and the inlet end of the return gas pipe is connected to the return gas inlet flange.

[0009] The secondary air fan is a centrifugal fan.

[0010] The secondary air fan is installed on the inlet side wall of the boiler body via a fan bracket.

[0011] The number of secondary air fans in a set is three.

[0012] The return gas pipe is made of stainless steel.

[0013] The advantages of this invention are: utilizing the heat energy of exhaust gas to reduce the oxygen content of combustion, control the furnace temperature, and reduce the generation of nitrogen oxides. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the main structure of this utility model.

[0015] Figure 2 This is a top view of the structure of this utility model. Detailed Implementation

[0016] 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 invention, but merely to illustrate selected embodiments of the 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. 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 does not need to be further defined and explained in subsequent drawings. In the description of the embodiments of this invention, it should be noted that if terms such as "upper," "lower," "inner," and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use, they are only for the convenience of describing the invention 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, and therefore should not be construed as a limitation of the invention. Furthermore, if terms such as "first" and "second" appear in the description of this invention, they are only used to distinguish descriptions and should not be construed as indicating or implying relative importance. In the description of the embodiments of this invention, it should also be noted that unless otherwise explicitly specified and limited, the terms "set" and "connect" 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; 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 invention according to the specific circumstances.

[0017] As shown in the attached drawings, this utility model includes a boiler body 1 and a dust collector 2. A grate 3 is provided at the lower part of the boiler body 1. The exhaust outlet of the boiler body 1 is connected to the air inlet of the dust collector 2 through an exhaust pipe 4. The feature is that a set of secondary air fans 5 is provided on the side wall of the inlet end of the boiler body 1. The air inlet of the secondary air fan 5 is connected to the exhaust pipe 4 through a return air pipe 6. An air supply pipe 7 is connected to the air outlet of the secondary air fan 5. The air supply pipe 7 is installed inside the grate 3. A set of exhaust holes is opened at the top of the air supply pipe 7.

[0018] The exhaust pipe 4 consists of a bottom horizontal pipe, a vertical pipe, and a top horizontal pipe. The bottom horizontal pipe is connected to the exhaust gas outlet of the boiler body 1, and the top horizontal pipe is connected to the inlet end of the dust collector 2. The vertical pipe is used instead of the pipe support, so that the exhaust pipe 4 can be directly installed on the horizontal ground.

[0019] The return gas pipe 6 is an L-shaped pipe, which is installed on one side of the boiler body 1 via a pipe support. The pipe wall temperature of the return gas pipe 6 is relatively high, and erecting the return gas pipe 6 at a certain height can prevent burn accidents.

[0020] The outlet end of the return air pipe 6 is equipped with a set of branch return air pipes, which are connected to the air inlets of the corresponding secondary air fans 5.

[0021] A return gas port is provided on the top horizontal pipe, and the inlet end of the return gas pipe 6 is connected to the return gas port flange.

[0022] Secondary air fan 5 is a centrifugal fan.

[0023] The secondary air fan 5 is installed on the inlet side wall of the boiler body 1 via a fan bracket.

[0024] The number of secondary air fans in a set is three.

[0025] The return air pipe 6 is made of stainless steel.

[0026] Example 1: During operation of the chain grate furnace, the exhaust gas generated during combustion is transported to the dust collector 2 through the exhaust pipe 4. After connecting to the return gas pipe 6, a set of secondary fans 5 extracts part of the exhaust gas and sends it back to the grate 3. The exhaust gas is sprayed upwards, passing through the gaps in the grate to contact the burning material. The exhaust gas has a low oxygen content, which can prevent the burning material from burning violently, control the furnace temperature, and reduce the generation of nitrogen oxides. At the same time, the exhaust gas has a high heat value, and sending the exhaust gas back to the feed end can utilize some of the exhaust gas heat energy.

Claims

1. A secondary air distribution device for a chain grate boiler, comprising a boiler body (1) and a dust collector (2), wherein a grate (3) is provided at the lower part of the boiler body (1), and the exhaust gas outlet of the boiler body (1) is connected to the air inlet of the dust collector (2) through an exhaust pipe (4), characterized in that, A set of secondary air fans (5) is installed on the side wall of the inlet end of the boiler body (1). The air inlet of the secondary air fan (5) is connected to the exhaust pipe (4) through the return air pipe (6). An air supply pipe (7) is connected to the air outlet of the secondary air fan (5). The air supply pipe (7) is installed inside the grate (3). A set of exhaust holes is opened at the top of the air supply pipe (7).

2. The secondary air distribution device for a chain grate furnace according to claim 1, characterized in that, The exhaust pipe (4) consists of a bottom horizontal pipe, a vertical pipe and a top horizontal pipe. The bottom horizontal pipe is connected to the exhaust outlet of the boiler body (1) and the top horizontal pipe is connected to the inlet end of the dust collector (2).

3. The secondary air distribution device for a chain grate furnace according to claim 2, characterized in that, The return gas pipe (6) is an L-shaped pipe, and the return gas pipe (6) is installed on one side of the boiler body (1) through a pipe support.

4. The secondary air distribution device for a chain grate furnace according to claim 3, characterized in that, The outlet end of the return air pipe (6) is provided with a set of branch return air pipes, which are connected to the air inlet of the corresponding secondary air fan (5).

5. A secondary air distribution device for a chain grate furnace according to claim 4, characterized in that, A return gas port is provided on the top horizontal pipe, and the inlet end of the return gas pipe (6) is connected to the return gas port flange.

6. A secondary air distribution device for a chain grate furnace according to claim 1, characterized in that, The secondary air fan (5) is a centrifugal fan.

7. A secondary air distribution device for a chain grate furnace according to claim 1, characterized in that, The secondary air fan (5) is installed on the inlet side wall of the boiler body (1) via a fan bracket.

8. A secondary air distribution device for a chain grate furnace according to claim 1, characterized in that, The number of secondary fans (5) in a set is three.

9. A secondary air distribution device for a chain grate furnace according to claim 1, characterized in that, The return gas pipe (6) is made of stainless steel.

Images