Air distribution system and method for two-chamber combustion

Abstract

The application provides a kind of air distribution system and method of two combustion chamber combustion, two combustion chamber combustion air distribution system includes two combustion chamber body and be located on two combustion chamber body on air distribution unit and combustor, air distribution unit includes air mixer and air distribution assembly, air distribution assembly includes multiple air distribution branch pipes, air mixer and air distribution branch pipe are connected with first air distribution fan and second air distribution fan respectively, first air distribution fan and second air distribution fan can respectively pass through air mixer and air distribution branch pipe with combustion-supporting air into two combustion chamber body, and mix with flue gas in two combustion chamber body.Relative to prior art, in the two combustion chamber combustion air distribution system of the application, air mixer includes air collecting box and multiple sleeves on air collecting box, multiple sleeves are connected with air distribution pipe respectively, air distribution pipe is located in the inside of two combustion chamber body, first air distribution fan is transported to two combustion chamber body with combustion-supporting air through sleeve and air distribution pipe, can be effectively mixed with flue gas, cooperate with combustion-supporting device, and combustible substance in flue gas can be fully combusted.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of waste treatment, more specifically, the present application relates to a kind of air distribution system and method of two combustion chamber combustion. BACKGROUND

[0002] At present, incineration treatment method can realize reduction, harmlessness and resource when treating organic waste, and is considered as the most effective method for waste treatment, which is also the main method for waste treatment in China.

[0003] However, the composition of hazardous waste is complex, which seriously affects the toxic and harmful components in the smoke after combustion, especially the carcinogens such as dioxin and furan contained therein, which are harmful to human body. Therefore, the combustible flue gas generated by incineration needs to be burned in the secondary combustion chamber. The secondary combustion chamber is a device for burning the combustible flue gas generated by incineration. The secondary combustion chamber generally provides combustion support and secondary air supply device to ensure that the flue gas is fully contacted with oxygen at high temperature, and the harmful substances in the flue gas are fully burned and decomposed, so as to meet the emission requirements.

[0004] The prior art has disclosed a variety of air distribution technologies related to secondary combustion chamber, for example, CN207702474U discloses a high-efficiency pulse air distribution system for a secondary combustion chamber of a solid waste incineration system, CN212841601U discloses a combustion air distribution system for reducing NOx in a secondary combustion chamber, CN109185899A discloses a wind distribution device for a secondary combustion chamber of a hazardous waste incineration system, and CN112555852A discloses a secondary combustion chamber combustion and air distribution system and method.

[0005] In the current waste incineration technology field, the secondary combustion chamber is generally provided with multiple layers of circumferentially arranged air distribution pipes below the flue gas inlet, and the air distribution pipes are centrally injected or provided with a certain rotary cutting angle, so that the flue gas forms a strong vortex flow field in the secondary combustion chamber, and the flue gas and the secondary air can be fully mixed.

[0006] However, the secondary combustion chamber in the existing incineration technology generally uses tangential air distribution, which adjusts the number, position and angle of the air distribution pipes to mix the flue gas and the combustion air, but the mixing effect is not good. In order to fully mix the flue gas and the secondary air supply, the secondary combustion chamber of the incinerator generally uses a high secondary air speed, which causes the flue gas to stay in the secondary combustion chamber for too short a time, and the organic pollutants cannot be completely burned.

[0007] Therefore, the present application provides an air distribution system and method for two combustion chamber combustion, which can fully mix the combustible flue gas and the secondary air in the secondary combustion chamber, and ensure that the flue gas has enough residence time in the secondary combustion chamber to ensure that the harmful substances in the flue gas are fully burned. SUMMARY

[0008] The application aims to provide a kind of air distribution system and method for two combustion chambers, to realize the sufficient mixing of combustible flue gas and secondary air in two combustion chambers, to ensure that flue gas has enough residence time in two combustion chambers, and to ensure that harmful substances in flue gas are fully burned out.

[0009] To achieve the above-mentioned application purposes, the application provides an air distribution system for two combustion chambers, which comprises a two combustion chamber body and an air distribution unit arranged on the two combustion chamber body, the air distribution unit comprises a air mixer, the air mixer is arranged on the side wall of the two combustion chamber body, the air mixer is connected with a first air distribution fan, the air mixer comprises a air collecting box and a plurality of sleeves arranged on the air collecting box, the plurality of sleeves are respectively connected with air distribution pipes, the air distribution pipes are located in the interior of the two combustion chamber body, and the first air distribution fan can deliver combustion-supporting air into the two combustion chamber body through the sleeves and the air distribution pipes.

[0010] According to one embodiment of the air distribution system for two combustion chambers of the application, the air collecting box is a vertical hollow cylindrical structure.

[0011] According to one embodiment of the air distribution system for two combustion chambers of the application, the axial direction of the sleeve and the axial direction of the air distribution pipe are arranged in the same direction as the axial direction of the two combustion chamber body.

[0012] According to one embodiment of the air distribution system for two combustion chambers of the application, the axial direction of the sleeve is arranged in the same direction as the axial direction of the two combustion chamber body, the axial direction of the air distribution pipe forms an angle A with the axial direction of the sleeve connected with the air distribution pipe, and the angle A is arranged to be 5°-20°.

[0013] According to one embodiment of the air distribution system for two combustion chambers of the application, the air distribution unit further comprises an air distribution assembly, the air distribution assembly comprises a plurality of air distribution branch pipes, the plurality of air distribution branch pipes are arranged around the side wall of the two combustion chamber body, the air outlets of the plurality of air distribution branch pipes are arranged towards the central axis of the two combustion chamber body, and the air distribution branch pipes are connected with a second air distribution fan.

[0014] According to one embodiment of the air distribution system for two combustion chambers of the application, the included angle B between the axial direction of the air distribution branch pipe and the horizontal plane is 5°-10°.

[0015] According to one embodiment of the air distribution system for two combustion chambers of the application, the axial direction of the air distribution branch pipe is arranged perpendicularly to the central axis of the two combustion chamber body.

[0016] To achieve the above-mentioned application purposes, the application further provides a method for incinerating flue gas by using the above-mentioned air distribution system for two combustion chambers, which comprises the following steps:

[0017] S1: start the first air distribution fan and the second air distribution fan, and pass the combustion-supporting air into the two-burner chamber body through the air mixer and the air distribution branch pipe respectively;

[0018] S2: pass the flue gas into the two-burner chamber body, and mix the flue gas with the combustion-supporting air in the two-burner chamber body;

[0019] S3: burn the flue gas in the two-burner chamber body under the action of the combustion-supporting fan and the burner.

[0020] Compared with the prior art, the air distribution system for the two-burner chamber combustion of the application comprises an air mixer and an air distribution assembly, the air distribution assembly comprises a plurality of air distribution branch pipes, the air mixer and the air distribution branch pipes are respectively connected with a first air distribution fan and a second air distribution fan, the plurality of air distribution branch pipes are located below the flue gas inlet, when the flue gas enters the two-burner chamber body, the second air distribution fan passes the combustion-supporting air into the interior of the two-burner chamber body through the plurality of air distribution branch pipes, so that a rotational flow layer preliminarily mixed with the flue gas is formed below the flue gas, at the same time, the first air distribution fan passes the combustion-supporting air into the interior of the two-burner chamber body through the pipe sleeve and the air distribution pipe, and drives the flue gas to impact the rotational flow layer, so that the flue gas and the combustion-supporting air can be fully mixed, and the organic pollutants in the flue gas can be completely combusted with the aid of the combustion-supporting device.

[0021] In addition, the air distribution system for the two-burner chamber combustion of the application is provided with a plurality of air distribution branch pipes, which are arranged on the side wall of the two-burner chamber body at intervals. In the process of burning the flue gas, the combustion-supporting air passed into the interior of the two-burner chamber body through the plurality of air distribution branch pipes forms a rotational flow layer, which can ensure the residence time of the flue gas in the two-burner chamber body during the combustion process, so as to ensure the full combustion of the flue gas. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some of the embodiments of the application, and therefore should not be regarded as a limitation to the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0023] Figure 1 The structure schematic diagram of an embodiment of the air distribution system for the two-burner chamber combustion of the application.

[0024] Figure 2 The structure schematic diagram of an embodiment of the air distribution system for the two-burner chamber combustion of the application. Figure 1 The structure schematic diagram of an embodiment of the air distribution system for the two-burner chamber combustion of the application.

[0025] Figure 3 The structure schematic diagram of an embodiment of the air distribution system for the two-burner chamber combustion of the application. Figure 2 The structure schematic diagram of an embodiment of the air distribution system for the two-burner chamber combustion of the application.

[0026] Figure 4Structure schematic view of another embodiment of the air distribution system for the two-burner combustion.

[0027] Figure 5 For Figure 4 Structure schematic view of the air mixer in the air distribution system for the two-burner combustion.

[0028] Figure 6 For Figure 5 Sectional view of the air mixer.

[0029] Shown in the figure: two-burner body 1, inlet 2, outlet 3, air mixer 4, air collecting box 41, sleeve 42, air distribution pipe 43, air distribution assembly 5, air distribution branch pipe 51.

DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solutions and beneficial technical effects of the present application clearer and more understandable, the present application will be further described in detail below in combination with the drawings and specific embodiments. It should be understood that the specific embodiments described in the present specification are only for the purpose of explaining the present application and are not intended to limit the present application.

[0031] It should also be understood that the terms used in the present specification are only for the purpose of describing specific embodiments and are not intended to limit the present application. As used in the present specification and the appended claims, the singular forms "a", "an" and "the" are intended to include the plural forms unless the context clearly indicates otherwise.

[0032] It should also be further understood that the term "and / or" used in the present specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes these combinations.

[0033] Please refer to Figure 1 According to one aspect of the present application, the present application proposes an air distribution system for two-burner combustion, which comprises a two-burner body 1 and a combustion unit (not marked) and an air distribution unit (not marked) arranged on the two-burner body 1. The two-burner body 1 is a gradually expanding furnace, and the two-burner body 1 is provided with an inlet 2 and an outlet 3. The combustible flue gas generated by the front-end incineration can enter the inside of the two-burner body 1 from the inlet 2 under the action of the negative pressure fan of the rear-end flue gas treatment system, and the flue gas is treated in the two-burner body 1 by the cooperation of the combustion unit and the air distribution unit, so that the harmful substances in the flue gas are fully combusted.

[0034] Specifically, the combustion unit comprises a burner (not shown) and a combustion air fan (not shown), the burner is arranged on the side wall of the secondary combustion chamber body 1, the combustion air fan is connected with the burner, the burner is connectable with the secondary combustion chamber body 1 through a flange, the combustion air fan provides necessary combustion air for the combustion of flue gas entering the secondary combustion chamber body 1, and the flue gas can be combusted in the secondary combustion chamber body 1 with the assistance of the combustion air fan.

[0035] It should be noted that, in the embodiment of the present application, the burner is a prior art, and therefore the structure of the burner is not described. The number of burners is not particularly limited, and can be selected at will by those skilled in the art according to actual needs. For example, as a preferred scheme, the number of burners is 2, and two burners are oppositely arranged on the side wall of the secondary combustion chamber body 1. The two burners need to be staggered by a certain angle to avoid flame overlap.

[0036] Please refer to Figure 2 and Figure 3 According to one embodiment of the present application, the air distribution unit comprises an air mixer 4 and an air distribution assembly 5. The air mixer 4 is arranged on the side wall of the secondary combustion chamber body 1 and close to the inlet 2 of the secondary combustion chamber body 1. The air mixer 4 is connected with a first air distribution fan (not shown). The first air distribution fan can pass combustion air into the interior of the secondary combustion chamber body 1 through the air mixer 4, mix the combustion air with flue gas entering the secondary combustion chamber body 1, and cooperate with the burner to make the flue gas completely combusted.

[0037] The air mixer 4 comprises a wind collecting box 41 and a plurality of sleeves 42 arranged in the wind collecting box 41. The wind collecting box 41 is a vertical hollow cylindrical structure. The axial direction of the plurality of sleeves 42 is the same as the axial direction of the wind collecting box 41. The plurality of sleeves 42 are respectively connected with air distribution pipes 43. The sleeves 42 pass through the side wall of the secondary combustion chamber body 1, and the air distribution pipes 43 are located in the interior of the secondary combustion chamber body 1. The axial direction of the sleeves 42 is the same as the direction of the axis P1 of the secondary combustion chamber body 1. The first air distribution fan can deliver combustion air into the interior of the secondary combustion chamber body 1 through the sleeves 42 and the air distribution pipes 43 to mix with the flue gas therein. The number of the air distribution pipes 43 can be 10-25, preferably 17. The air distribution speed in the air distribution pipes 43 can be 25-45 m / s. The pipe diameter size of the air distribution pipes 43 can be determined according to the air distribution amount and the air distribution speed.

[0038] Please refer to Figure 1As shown, according to one embodiment of the present application, the air distribution assembly 5 comprises a plurality of air distribution branches 51, which are arranged on the side wall of the secondary combustion chamber body 1 around the axis P1, and the air outlets of the air distribution branches 51 are directed towards the axis P1 of the secondary combustion chamber body 1. The air distribution branches 51 are connected with a second air distribution fan (not shown), which can pass the combustion-supporting air into the interior of the secondary combustion chamber body 1 through the air distribution branches 51. The plurality of air distribution branches 51 pass the combustion-supporting air into the interior of the secondary combustion chamber body 1, and the combustion-supporting air forms a rotational flow layer in the interior of the secondary combustion chamber body 1, which can be used for the preliminary mixing with the flue gas. In one embodiment of the present application, the flue gas generated by the front-end incineration can enter the secondary combustion chamber body 1 from the inlet 2 under the action of the negative pressure fan of the rear-end flue gas treatment system. Due to the sudden expansion of the cross section of the secondary combustion chamber body 1, the flow rate of the flue gas in the secondary combustion chamber body 1 rapidly decreases, and the combustion-supporting air output by the second air distribution fan enters the secondary combustion chamber body 1 through the plurality of air distribution branches 51 to form a rotational flow layer, which is mixed with the flue gas after colliding with the flue gas. In addition, the combustion-supporting air output by the first air distribution fan enters the secondary combustion chamber body 1 along the axis P1 through the air distribution pipe 43, and forms a strong turbulent flow to the existing rotational flow layer, thereby improving the mixing degree of the flue gas and the combustion-supporting air, and cooperating with the burner to make the harmful gas in the flue gas incinerate more completely.

[0039] Please refer to Figure 1 As shown, according to one embodiment of the present application, the included angle B between the axial direction of the air distribution branch 51 and the horizontal plane can be set to 5°-10°. The combustion-supporting air output by the second air distribution fan forms a rotational flow under the action of the plurality of air distribution branches 51, which can increase the sufficient mixing of the combustion-supporting air and the flue gas, and is more beneficial to the sufficient combustion of the flue gas. It should be noted that in another embodiment of the present application, the axial direction of the air distribution branch 51 can be perpendicular to the axis P1.

[0040] According to one embodiment of the present application, the axial direction of the air distribution pipe 43 and the sleeve pipe 42 is the same as the axis P1 in the secondary combustion chamber body 1. In one embodiment of the present application, please refer to Figures 1 to 3 As shown, the combustion-supporting air generated by the first air distribution fan will enter the air mixer 4 through the pipeline, and under the action of the front-end pressure, the combustion-supporting air is uniformly distributed to each air distribution pipe 43, and the combustion-supporting air enters the secondary combustion chamber body 1 in a bundle shape to be fully mixed with the flue gas, so that the flue gas is fully combusted in the secondary combustion chamber body 1.

[0041] Please refer to Figures 4 to 6As shown, according to another embodiment of the present application, the axial direction of the air distribution pipe 43 forms an angle A with the axial direction of the sleeve pipe 42 connecting the air distribution pipe 43, and the angle A can be set to 5-20°. The plurality of air distribution pipes 43 are arranged in a spiral direction on the air collecting pipe 41, and the first and last ends of each air distribution pipe 43 are staggered in a spiral shape. The combustion-supporting air output by the first air distribution fan enters the air mixer 4 through the pipeline, and under the action of the front-end pressure, the combustion-supporting air is uniformly distributed to each air distribution pipe 43. Since the first and last ends of the plurality of air distribution pipes 43 are staggered in a spiral shape, the combustion-supporting air output by the first air distribution fan enters the secondary combustion chamber body 1 in a spiral flow. The combustion-supporting air in the spiral flow collides with the existing spiral flow layer to increase the mixing of the combustion-supporting air and the flue gas, which is beneficial to the complete combustion of the flue gas.

[0042] According to another aspect of the present application, the present application provides a method for incinerating flue gas by using the air distribution system for the secondary combustion chamber combustion described in the above embodiments, which comprises the following steps:

[0043] 1. Start the first air distribution fan and the second air distribution fan, and pass the combustion-supporting air into the secondary combustion chamber body 1 through the air mixer 4 and the air distribution branch pipe 51, respectively;

[0044] 2. Pass the flue gas into the secondary combustion chamber body 1 from the inlet 2, and mix the flue gas with the combustion-supporting air in the secondary combustion chamber body 1;

[0045] 3. Burn the flue gas in the secondary combustion chamber body 1 under the action of the combustion-supporting fan and the burner.

[0046] According to the method for incinerating flue gas according to the embodiment of the present application, the hazardous waste completes the whole process of drying, combustion and burnout at the front end. A large amount of flue gas is generated during the combustion process. After the flue gas enters the secondary combustion chamber body 1, the flue gas can be ensured to stay in the secondary combustion chamber body 1 for a certain residence time under the action of the plurality of air distribution branch pipes 51, and the flue gas can be completely burned and the harmful substances can be fully decomposed by cooperating with the burner.

[0047] The present application is not limited to the description and embodiments described in the specification, and therefore other advantages and modifications can be easily realized by those skilled in the art, and the present application is not limited to specific details, representative devices and examples of the drawings shown and described herein.

Claims

1. An air distribution system for a two-combustion chamber, characterized in that, The air distribution system for the secondary combustion chamber includes a secondary combustion chamber body and an air distribution unit disposed on the secondary combustion chamber body. The air distribution unit includes an air mixer disposed on the side wall of the secondary combustion chamber body. The air mixer is connected to a first air distribution fan. The air mixer includes an air collection box and multiple sleeves disposed on the air collection box. The axial direction of the multiple sleeves is the same as the axial direction of the air collection box. The multiple sleeves pass through the side wall of the secondary combustion chamber body, and air distribution pipes are respectively connected to the multiple sleeves. The air distribution pipes are located inside the secondary combustion chamber body. The first air distribution fan can... The sleeve and the air distribution pipe deliver combustion air to the secondary combustion chamber body. The axial direction of the sleeve is aligned with the axial direction of the secondary combustion chamber body. The axial direction of the air distribution pipe forms an angle A with the axial direction of the sleeve connecting to the air distribution pipe. Angle A is set to 5°-20°. The air distribution unit also includes an air distribution assembly, which includes multiple air distribution branch pipes. The multiple air distribution branch pipes are arranged around the side wall of the secondary combustion chamber body. The air outlets of the multiple air distribution branch pipes are arranged facing the central axis of the secondary combustion chamber body. The air distribution branch pipes are connected to a second air distribution fan.

2. The air distribution system for secondary combustion chambers according to claim 1, characterized in that, The air collection box is a vertical hollow cylindrical structure.

3. The air distribution system for secondary combustion chambers according to claim 1, characterized in that, The angle B formed between the axial direction of the air distribution branch pipe and the horizontal plane is 5°-10°.

4. The air distribution system for secondary combustion chambers according to claim 1, characterized in that, The axial direction of the air distribution branch pipe is perpendicular to the central axis of the secondary combustion chamber body.

5. A method for combustion flue gas using a two-combustion chamber combustion air distribution system as described in any one of claims 1-4, characterized in that, The steps are as follows: S1: Start the first and second air distribution fans and introduce the combustion air into the main body of the secondary combustion chamber through the air mixer and the air distribution branch pipe respectively; S2: Flue gas is introduced into the secondary combustion chamber from the inlet and mixed with combustion air inside the secondary combustion chamber; S3: Under the action of the combustion fan and burner, the flue gas is burned in the secondary combustion chamber.

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