A combustion gas mixing and recovering structure and a boiler

Abstract

The utility model discloses a kind of mixed combustion gas recovery structure and boiler, wherein, mixed combustion gas recovery structure includes combustion chamber and spray gun, and the side wall of combustion chamber is provided with the second air duct of penetration;The output end of spray gun is arranged in the second air duct, and first channel for outputting mixed combustion gas and second channel for outputting secondary air are equipped in spray gun;The tail gas outlet downstream of combustion chamber is connected with spray gun;In the mixed combustion gas recovery structure of the utility model, mixed combustion gas in combustion chamber tail gas is recovered into combustion chamber by the form of outputting through spray gun for secondary combustion, and the installation way of spray gun is to use the existing secondary air duct structure of combustion chamber, and the installation mode is simple;The input of mixed combustion gas and air can be realized simultaneously by spray gun structure, the recovery efficiency of mixed combustion gas is improved, while saving fuel, air pollution is reduced, and the processing cost of combustion tail gas is saved.

Description

Technical Field

[0001] This utility model relates to the field of co-firing gas recovery technology, specifically to a co-firing gas recovery structure and boiler. Background Technology

[0002] In existing related technologies, equipment with large combustion chambers, such as boilers, requires a primary air duct to be installed at the bottom of the combustion chamber to introduce fresh air and bed material. In order to improve the recovery efficiency, some also install a secondary air duct on the side wall of the combustion chamber to introduce air into the combustion chamber again to provide sufficient oxygen for the combustion chamber.

[0003] Generally, the exhaust gases from the aforementioned combustion chamber need to be treated to reduce air pollution. The characteristic of some chemical exhaust gases being rich in combustible gases such as methane necessitates the design of a combustible gas recovery structure to improve recovery efficiency and reduce air pollution. Utility Model Content

[0004] The purpose of this utility model is to overcome the shortcomings of the prior art and provide a co-firing gas recovery structure and boiler.

[0005] The objective of this utility model is achieved through the following technical solution: On the one hand, this utility model provides a gas-blended recovery structure, including a combustion chamber and a spray gun, wherein a secondary air duct is provided through the side wall of the combustion chamber; The output end of the spray gun passes through the secondary air duct. The spray gun is provided with a first channel for outputting combustible gas and a second channel for outputting secondary air. The exhaust gas outlet of the combustion chamber is connected downstream to the first channel.

[0006] In this invention's blended gas recovery structure, the blended gas in the combustion chamber exhaust gas is recovered into the combustion chamber for secondary combustion in the form of a spray gun output. The spray gun is installed using the existing secondary air duct structure of the combustion chamber, making the installation method simple. The spray gun structure can simultaneously achieve the input of blended gas and air, improving the recovery efficiency of blended gas, saving fuel, reducing air pollution, and saving on the treatment cost of combustion exhaust gas.

[0007] Furthermore, both the first channel and the second channel are pipe structures provided on the spray gun, wherein the first channel is coaxially arranged within the second channel.

[0008] Furthermore, a heat insulation layer is provided between the outer wall of the spray gun and the inner wall of the secondary air duct. The heat insulation layer can both protect the spray gun and allow the spray gun to be stably installed on the secondary air duct.

[0009] Furthermore, the outer wall of the second channel is the outer wall of the spray gun, and the outer diameter of the second channel matches the inner diameter of the heat insulation layer, making the spray gun structure simple and easy to maintain.

[0010] Furthermore, at the output end of the spray gun, the first channel extends outside the second channel, so that after the mixed gas is preferentially sprayed out, it is enveloped and impacted by the high-speed oxygen flow on the outer periphery, achieving efficient atomization and rapid mixing; at the same time, it can prevent the mixed gas from prematurely contacting oxygen inside the first channel, which could lead to local high temperature or blockage risk, and protect the spray gun material from high temperature corrosion.

[0011] Furthermore, the second channel is closed at one end outside the combustion chamber, and the air inlet of the second channel is located on the side of the second channel to facilitate the input of air into the second channel.

[0012] Furthermore, the secondary air duct is inclined through the side wall of the combustion chamber, and the end of the secondary air duct located outside the combustion chamber is higher than the end located inside the combustion chamber, which allows the blended gas and secondary air to mix into the high-temperature environment of the lower layer of the combustion chamber, which is conducive to complete combustion.

[0013] Furthermore, a gap is left between the output end of the spray gun and the inner wall of the combustion chamber to prevent the spray gun from contacting the bed material in the combustion chamber. During the bed material filling process in the combustion chamber, the bed material can be prevented from washing away the spray gun and causing wear and blockage, thus avoiding affecting the normal operation of the co-firing gas recovery structure.

[0014] Specifically, the distance between the first channel and the inner wall of the combustion chamber is 5 cm.

[0015] On the other hand, this utility model also provides a boiler, including a boiler body, on which the aforementioned co-firing gas recovery structure is provided, which is suitable for the secondary combustion treatment of chemical methane-rich tail gas. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the gas recovery structure in Embodiment 1 of this utility model; Figure 2 This is a schematic diagram of the spray gun in Embodiment 1 of this utility model; Figure 3 This is a schematic diagram of the combustion chamber in Embodiment 1 of this utility model; Figure 4 This is a schematic diagram of the gas recovery structure in Embodiment 2 of this utility model.

[0017] The attached diagram lists the components represented by each number as follows: 10-Combustion chamber, 100-Secondary air duct, 101-Insulation layer, 102-Primary air duct, 2-Spray gun, 20-First channel, 200-Mixed gas inlet, 201-Extension section, 21-Second channel, 210-Air inlet, 211-Closed end, 212-Air vent, 30-Air source, 31-Mixed gas source. Detailed Implementation

[0018] The principles and features of this utility model are described below. The examples given are only for explaining this utility model and are not intended to limit the scope of this utility model.

[0019] Example 1: Reference Figures 1 to 3 This embodiment provides a gas-blended recovery structure, including a combustion chamber 10 and a spray gun 2. A secondary air duct 100 is provided through the side wall of the combustion chamber 10, and the output end of the spray gun 2 is provided through the secondary air duct 100.

[0020] The spray gun 2 is equipped with a first channel 20 for outputting mixed combustion gas and a second channel 21 for outputting secondary air. That is, the first channel 20 of the spray gun 2 is connected to the mixed combustion gas source 31, and the second channel 21 of the spray gun 2 is connected to the air source 30.

[0021] Specifically, the exhaust outlet of the combustion chamber 10 is connected downstream to the first channel 20 of the spray gun 2, that is, the mixed combustion gas carried in the exhaust gas of the combustion chamber 10 is input into the first channel 20 of the spray gun 20 as the mixed combustion gas source 31; while the air source 30 is input into the combustion chamber 10 through the second channel 21 to form secondary air.

[0022] In this embodiment, the spray gun 2 is installed by utilizing the existing secondary air duct 100 of the combustion chamber 10. The installation method is simple, and the structure of the spray gun 2 can simultaneously realize the input of mixed combustion gas and secondary air, thereby improving the recovery efficiency of mixed combustion gas. While saving fuel, it can reduce air pollution and save the treatment cost of exhaust gas in the combustion chamber 10.

[0023] In this embodiment, the spray gun 2 is made of high-temperature resistant stainless steel, which extends the service life of the spray gun 2.

[0024] It is easy to understand that both the air source 30 and the co-firing gas source 31 are introduced into the spray gun 2 by positive pressure pumping. The air is pumped to form secondary air, while the co-firing gas is pumped to form a high-speed airflow. The pumping structure is existing technology and will not be described in detail here.

[0025] In the connection structure between the exhaust outlet of the combustion chamber 10 and the first channel 20 of the spray gun 2, some dust removal and impurity removal structures can also be set to remove dust and impurities in the blended gas and improve the combustion quality of the blended gas.

[0026] Reference Figure 3 The primary air duct 102 of the combustion chamber 10 is located at the bottom of the combustion chamber 10, while the secondary air duct 102 is horizontally arranged on the side wall of the combustion chamber 10 above the primary air duct 102.

[0027] In some embodiments, the first channel 20 and the second channel 21 may be two sets of independent channels arranged in parallel within the spray gun 2.

[0028] Reference Figure 2 In this embodiment, the first channel 20 and the second channel 21 are both pipe structures provided on the spray gun 2. The first channel 20 is coaxially arranged in the second channel 21, and the outer wall of the second channel 21 constitutes the outer wall of the spray gun 2. At this time, both the first channel 20 and the second channel 21 are made of high temperature resistant stainless steel.

[0029] In some embodiments, when the first channel 20 is coaxially disposed within the second channel 21, the outer wall of the second channel 21 may also be fitted with some shell structures as the outer wall of the spray gun 2, so as to protect the outer wall of the second channel 21.

[0030] Reference Figure 1 In some embodiments, a heat insulation layer 101 is provided between the outer wall of the spray gun 2 and the inner wall of the secondary air duct 100. The heat insulation layer 101 can both protect the spray gun 2 and reduce the heat conduction of the combustion chamber 10 wall to the spray gun 2, and also serve as a fixing structure for the spray gun 2, so that the spray gun 2 can be stably installed in the secondary air duct 100.

[0031] The heat insulation layer 101 can be installed on the outer wall of the spray gun 2 or on the inner wall of the secondary air duct 100.

[0032] When the outer wall of the second channel 21 is also the outer wall of the spray gun 2, the outer diameter of the second channel 21 matches the inner diameter of the heat insulation layer 101, and the spray gun 2 can be fixed by inserting it into the heat insulation layer 101, which facilitates the maintenance of the spray gun 2.

[0033] Reference Figure 2 In some embodiments, at the output end of the spray gun 2, the first channel 20 extends outside the second channel 21, that is, the output end of the first channel 20 has an extension 201, which is located outside the output end of the second channel 21.

[0034] By setting the extension section 201, the mixed gas is sprayed out along the first channel 20 and then enveloped and impacted by the high-speed oxygen flow in the secondary air sprayed out by the second channel 21 on the outer periphery, achieving efficient atomization and rapid mixing. At the same time, it can prevent the mixed gas from prematurely contacting oxygen inside the first channel 20, which could lead to local high temperature or blockage risk. The secondary air provided by the second channel 21 cools the nozzle structure formed by the extension section 201 of the first channel 20, extending the service life of the nozzle and protecting the spray gun 2 from high temperature corrosion.

[0035] Reference Figure 2 In some embodiments, the output end sidewall of the second channel 21 is also provided with an air hole 212, which can divide the outer oxygen flow to form multiple branched airflows and enhance the turbulent mixing efficiency of air and combustion gas.

[0036] Reference Figure 2 The second channel 21 has a closed end 211 located outside the combustion chamber 10, and the air inlet 210 of the second channel 21 is opened on the side of the second channel 21; while the first channel 21 extends through and beyond the closed end 211, and the side wall of the first channel 21 is provided with a mixed combustion gas inlet 211; the air inlet 210 is connected to the air source 30, and the mixed combustion gas inlet 211 is connected to the mixed combustion gas source 31.

[0037] Reference Figure 1 and Figure 2 A gap is left between the output end of the spray gun 2 and the inner wall of the combustion chamber 10. During the process of adding bed material in the combustion chamber 10, the bed material can be prevented from washing away the spray gun 2 and causing wear and blockage of the spray gun 2, thus avoiding affecting the normal operation of the co-firing gas recovery structure.

[0038] For example, when the first channel 20 and the second channel 21 are coaxially arranged, the distance between the end of the extension 201 of the first channel 20 and the inner wall of the combustion chamber 10 is 5 cm.

[0039] Example 2: The difference between this embodiment and Embodiment 1 is that the secondary air duct 100 in this embodiment is inclined and penetrates the side wall of the combustion chamber 10.

[0040] Specifically, refer to Figure 4 In this embodiment, the secondary air duct 100 is inclined through the side wall of the combustion chamber 10, and the end of the secondary air duct 100 located outside the combustion chamber 10 is higher than the end of the secondary air duct 100 located inside the combustion chamber 10. When the spray gun 2 is inserted into the secondary air duct 100, the output end of the spray gun 2 is inclined downward, which allows the combustion gas and secondary air to be mixed into the high-temperature environment of the lower layer of the combustion chamber 10, which is conducive to complete combustion.

[0041] Example 3: On the other hand, this utility model also provides a boiler, including a boiler body, on which the co-firing gas recovery structure of the aforementioned embodiment one or embodiment two is provided, which is suitable for the secondary combustion treatment of chemical methane-rich tail gas.

[0042] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0043] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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 communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0044] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0045] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0046] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A gas-fuel recovery structure, comprising a combustion chamber, wherein a secondary air duct is provided on the side wall of the combustion chamber, characterized in that, It also includes spray guns; The output end of the spray gun passes through the secondary air duct. The spray gun is provided with a first channel for outputting combustible gas and a second channel for outputting secondary air. The exhaust gas outlet of the combustion chamber is connected downstream to the first channel.

2. The gas recovery structure according to claim 1, characterized in that, Both the first channel and the second channel are pipe structures provided on the spray gun, wherein the first channel is coaxially arranged in the second channel.

3. The gas recovery structure according to claim 2, characterized in that, A heat insulation layer is also provided between the outer wall of the spray gun and the inner wall of the secondary air duct.

4. The gas recovery structure according to claim 3, characterized in that, The outer wall of the second channel is the outer wall of the spray gun, and the outer diameter of the second channel matches the inner diameter of the heat insulation layer.

5. The gas recovery structure according to claim 2, characterized in that, At the output end of the spray gun, the first channel extends outside the second channel.

6. The gas recovery structure according to claim 2, characterized in that, The second passage is closed at one end outside the combustion chamber, and the air inlet of the second passage is located on the side of the second passage.

7. The gas recovery structure according to claim 2, characterized in that, The secondary air duct obliquely penetrates the side wall of the combustion chamber, and the end of the secondary air duct located outside the combustion chamber is higher than the end of the secondary air duct located inside the combustion chamber.

8. The gas recovery structure according to claim 2 or 7, characterized in that, A gap is left between the output end of the spray gun and the inner wall of the combustion chamber.

9. The gas recovery structure according to claim 8, characterized in that, The distance between the first channel and the inner wall of the combustion chamber is 5 cm.

10. A boiler, characterized in that, The boiler body includes a boiler body, which is provided with a co-firing gas recovery structure as described in any one of claims 1 to 9.

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