Combustion system and method of inverted-alpha shaped flame air distribution type layered boiler

Abstract

The invention discloses a combustion system and method of an inverted-alpha shaped flame air distribution type layered boiler, and belongs to the technical field of boilers. The combustion system comprises a front arch, a rear arch, a fire grate and an air distribution system, wherein the front arch and the rear arch are separately arranged aslant; the top height of the front arch is less than that of the rear arch; the rear arch is shorter than the front arch; an included angle of the front arch and the rear arch is an obtuse angle; the front arch, the rear arch and a partitioning plate are divided into a front zone and a rear zone, the front zone is a combustion zone and the rear zone is a cooling area; the air distribution system comprises a main pipe, air blowers, a fume exhaust pipe and a plurality of air distribution pipes; the fume exhaust pipe and one end of each of the plurality of air distribution pipes are connected with the main pipe; the other end of each of the pluralityof air distribution pipes extends into a combustion chamber from the front arch or the rear arch; an adjusting valve is arranged on the each air distribution pipe; the other end of the fume exhaust pipe extends into a cooling fume exhaust zone, the main pipe communicates with an air pre-heater of an existing boiler; and the air blowers are separately arranged on the main pipe and the fume exhaustpipe. According to the system and the method disclosed by the invention, generation of nitrogen oxide can be reduced, and fume exhaustion loss is reduced.

Description

technical field

[0001] The invention relates to a boiler and a combustion method for the boiler, in particular to a combustion system and method for a reverse α-shaped flame-distributing air-distributing layer-burning furnace, belonging to the technical field of boilers. Background technique

[0002] Layer-fired furnaces are widely used because of their simple structure, convenient operation, and low requirements for the quality of firemen. According to statistics, they account for as much as 90% of industrial boilers, and are widely used in many industries such as building materials, chemicals, printing and dyeing, heat treatment, and pharmaceuticals. , is an important combustion method for boilers in our country. The heat loss of a layer combustion furnace is a factor that affects its combustion efficiency. The existing layer combustion rate has the following problems:

[0003] 1. The combustion control of the existing layer-burning furnace is not good, and it is difficul...

Examples

specific Embodiment approach 1

[0015] Specific implementation mode one: combine figure 1 Explain that this embodiment is a large anti-α-shaped flame distribution type layer combustion furnace combustion system, which includes a front arch 1, a rear arch 2 and a fire grate 3; the bottom of the front arch 1 and the rear arch 2 is provided with a fire grate 3 ; also includes the air distribution system 4; the front arch 1 and the rear arch 2 are arranged obliquely respectively, the top height HA of the front arch 1 is smaller than the top height HB of the rear arch 2, the length of the rear arch 2 is smaller than the length of the front arch 1, and the front arch 1 The angle between arch 1 and rear arch 2 is an obtuse angle. The front arch, rear arch and partition plate are divided into front area and rear area. The front area is the combustion area, and the rear area is the cooling area. The combustion zone can produce anti-α-shaped flames; the air distribution system 4 includes a main pipe 4-1, a fan, a smok...

specific Embodiment approach 2

[0016] Specific implementation mode two: combination figure 1 Note that one of the multiple air distribution pipes 4-3 in this embodiment extends into the pyrolysis zone below the front arch 1 . Below the front arch, from left to right are the preheating zone, pyrolysis zone and ignition zone respectively, the main combustion zone in the middle, and the burnout zone 5 on the right. The high-temperature mixed flue gas is introduced into the pyrolysis zone of the forward arch 1 to solve the problem of difficulty in ignition of the pyrolysis zone of the forward arch 1 . The high-temperature gas is introduced into the pyrolysis zone of the front arch to ignite the hot gas, thereby solving the ignition problem; the cooling zone is used to reduce the temperature of the ash discharged from the grate, reducing the physical heat loss of the ash, and at the same time, the oxygen-enriched high-temperature flue gas discharged from the cooling zone The front and rear arches are introduced...

specific Embodiment approach 3

[0017] Specific implementation mode three: combination figure 1 To illustrate, the included angle β between the front arch 1 and the horizontal plane in this embodiment is 25°-30°. In this way, the length of the front arch 1 can be increased as much as possible, so that the burning flame can form anti-α flames at the front arch 1 and the rear arch 2 . Other compositions and connections are the same as those in the second embodiment.

technical field

[0001] The invention relates to a boiler and a combustion method for the boiler, in particular to a combustion system and method for a reverse α-shaped flame-distributing air-distributing layer-burning furnace, belonging to the technical field of boilers. Background technique

[0002] Layer-fired furnaces are widely used because of their simple structure, convenient operation, and low requirements for the quality of firemen. According to statistics, they account for as much as 90% of industrial boilers, and are widely used in many industries such as building materials, chemicals, printing and dyeing, heat treatment, and pharmaceuticals. , is an important combustion method for boilers in our country. The heat loss of a layer combustion furnace is a factor that affects its combustion efficiency. The existing layer combustion rate has the following problems:

[0003] 1. The combustion control of the existing layer-burning furnace is not good, and it is difficul...

Examples

specific Embodiment approach 1

[0015] Specific implementation mode one: combine figure 1 Explain that this embodiment is a large anti-α-shaped flame distribution type layer combustion furnace combustion system, which includes a front arch 1, a rear arch 2 and a fire grate 3; the bottom of the front arch 1 and the rear arch 2 is provided with a fire grate 3 ; also includes the air distribution system 4; the front arch 1 and the rear arch 2 are arranged obliquely respectively, the top height HA of the front arch 1 is smaller than the top height HB of the rear arch 2, the length of the rear arch 2 is smaller than the length of the front arch 1, and the front arch 1 The angle between arch 1 and rear arch 2 is an obtuse angle. The front arch, rear arch and partition plate are divided into front area and rear area. The front area is the combustion area, and the rear area is the cooling area. The combustion zone can produce anti-α-shaped flames; the air distribution system 4 includes a main pipe 4-1, a fan, a smok...

specific Embodiment approach 2

[0016] Specific implementation mode two: combination figure 1 Note that one of the multiple air distribution pipes 4-3 in this embodiment extends into the pyrolysis zone below the front arch 1 . Below the front arch, from left to right are the preheating zone, pyrolysis zone and ignition zone respectively, the main combustion zone in the middle, and the burnout zone 5 on the right. The high-temperature mixed flue gas is introduced into the pyrolysis zone of the forward arch 1 to solve the problem of difficulty in ignition of the pyrolysis zone of the forward arch 1 . The high-temperature gas is introduced into the pyrolysis zone of the front arch to ignite the hot gas, thereby solving the ignition problem; the cooling zone is used to reduce the temperature of the ash discharged from the grate, reducing the physical heat loss of the ash, and at the same time, the oxygen-enriched high-temperature flue gas discharged from the cooling zone The front and rear arches are introduced...

specific Embodiment approach 3

[0017] Specific implementation mode three: combination figure 1 To illustrate, the included angle β between the front arch 1 and the horizontal plane in this embodiment is 25°-30°. In this way, the length of the front arch 1 can be increased as much as possible, so that the burning flame can form anti-α flames at the front arch 1 and the rear arch 2 . Other compositions and connections are the same as those in the second embodiment.

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