Waste gas combustion purification device

Abstract

The utility model relates to the technical field of nitriding furnace related equipment, in particular to a waste gas purification device which comprises a gas mixing device. The gas mixing device comprises a waste gas leading-in part and a combustion-supporting gas leading-in part; the waste gas leading-in part comprises a containing cavity and a waste gas inlet communicated with the side face of the containing cavity, the containing cavity is called a waste gas chamber, and a waste gas exhaust port is formed in the upper portion of the waste gas chamber; a combustion-supporting gas leading-in part is arranged above the waste gas leading-in part; the combustion-supporting gas leading-in part comprises an annular groove, and a combustion-supporting gas inlet is formed in the side face of the annular groove; an opening is formed in the upper portion of the annular groove. The annular groove cover is arranged above the waste gas exhaust port; waste gas exhausted from the waste gas exhaust port is exhausted upwards through the middle of the annular groove cover; the aim of uniformly mixing the waste gas is fulfilled, and the subsequent ignition and purification effects are better.

Description

Technical Field

[0001] The present application relates to the technical field of nitriding furnace related equipment, and in particular to an exhaust gas purification device. Background Art

[0002] The nitriding furnace will produce some harmful gases and pollutants during operation, such as ammonia, which has potential hazards to the environment and human health, so it needs to be effectively treated and purified.

[0003] Ammonia burns in high-concentration oxygen to react into nitrogen and water. The combustion can effectively purify the exhaust gas from the nitriding furnace. However, the exhaust gas discharge is not stable. During combustion, it is easy to have problems such as insufficient combustion purification or waste of combustion-supporting gas. Utility Model Content

[0004] The purpose of this section is to summarize some aspects of the embodiments of the utility model and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the abstract of the specification and the name of the utility model of this application to avoid blurring the purpose of this section, the abstract of the specification and the name of the utility model, and such simplifications or omissions cannot be used to limit the scope of the utility model.

[0005] In view of the above problems and / or the problems existing in the prior art, the present utility model is proposed.

[0006] The burner includes a gas mixing device;

[0007] The gas mixing device includes an exhaust gas introduction part and a combustion-supporting gas introduction part;

[0008] The exhaust gas introduction part includes a accommodating cavity and an exhaust gas inlet connected to the side of the accommodating cavity. The accommodating cavity is called an exhaust gas chamber, and an exhaust gas exhaust port is arranged above the exhaust gas chamber.

[0009] A combustion-supporting gas introduction portion is provided above the exhaust gas introduction portion;

[0010] The combustion-supporting gas introduction part comprises an annular groove, a combustion-supporting gas inlet is arranged on the side of the annular groove, and an opening is arranged above the annular groove;

[0011] The annular groove cover is arranged above the exhaust gas outlet;

[0012] The exhaust gas discharged from the exhaust port is discharged upward through the middle part of the annular groove cover.

[0013] Firstly, the utility model optimizes the exhaust gas combustion purification device. After the optimization, the burner includes a mixing device. The mixing device is provided with an exhaust gas chamber, so that the exhaust gas can be evenly mixed with the combustion-supporting gas after being buffered by the exhaust gas chamber. Secondly, an annular groove is provided at the combustion-supporting gas inlet part. The combustion-supporting gas is evenly mixed with the exhaust gas discharged from the exhaust gas chamber through multiple openings in the annular groove, so that the exhaust gas and the combustion-supporting gas are mixed more fully. Finally, the mixed gas is discharged upward from the hollow middle part of the annular groove cover to avoid the formation of a confined space that causes the mixed gas to explode and affect the purification effect.

[0014] Preferably, a tubular metal cover is provided above the burner as a combustion-supporting cover; the diameter of the combustion-supporting cover is 1-2 times the diameter of the annular groove, and the height of the combustion-supporting cover is 6-12 times the annular groove; the utility model optimizes the exhaust gas combustion purification device, and after the optimization, a combustion-supporting cover is provided on the burner, and the diameter of the combustion cover is 1-2 times the diameter of the annular groove, so that the mixed gas can be diffused and mixed more fully, and the height of the combustion-supporting cover is maintained at 6-12 times the annular groove, so that the gas is sucked upward by the combustion cover, thereby maintaining the continuous and uniform combustion effect of the burner.

[0015] Preferably, the exhaust chamber is barrel-shaped, and the diameter of the exhaust chamber is 10-20 times the diameter of the exhaust gas inlet. By setting the exhaust chamber with a diameter 10-20 times the diameter of the exhaust gas inlet, the exhaust gas is initially buffered when entering the exhaust chamber, so that the exhaust gas and the combustion-supporting gas are mixed more fully.

[0016] Preferably, the exhaust port is connected to a nozzle for spraying exhaust gas, the nozzle is made of copper, and jet holes are arranged on the side of the nozzle; jet holes are arranged above the side of the nozzle, so that the exhaust gas can be sprayed out in multiple streams in a direction perpendicular to the axis of the nozzle, which helps to mix the exhaust gas with the combustion-supporting gas.

[0017] Preferably, a one-way valve is also provided in the nozzle. When the exhaust gas in the exhaust gas chamber reaches a certain pressure, the one-way valve is pushed open and sprayed from the jet hole into the combustion chamber to mix with the combustion-supporting gas for combustion. The one-way valve is provided in the nozzle so that the pressure in the exhaust gas chamber reaches a certain value before the exhaust gas is sprayed, thereby avoiding the situation where there is too little exhaust gas to carry out continuous combustion and purification. Secondly, the one-way valve can also prevent the combustion-supporting gas from entering the exhaust gas chamber and causing an explosion hazard.

[0018] Preferably, a filter element for filtering smoke in the exhaust gas is provided at the exhaust gas inlet, and the filter element is made of alumina ceramics; the filter element filters out smoke in the exhaust gas to avoid clogging the jet holes or hindering the mixing of ammonia in the exhaust gas and the combustion-supporting gas.

[0019] Preferably, the exhaust gas combustion control system is provided with a microprocessor system, the signal input end of the microprocessor system is connected to the signal output end of the ammonia concentration sensor, and the signal output end of the microprocessor system is connected to the signal input end of the electric control valve; the ammonia concentration sensor is arranged on the side of the exhaust port of the burner combustion chamber; the electric control valve is arranged in a pipeline connected to the combustion-supporting gas inlet and the oxygen tank; when the exhaust gas is burning, the ammonia content in the exhaust gas is detected by the ammonia concentration sensor, and the electric control valve is controlled by the microprocessor system according to the data of the ammonia concentration sensor to adjust the intake amount of the combustion-supporting gas to ensure sufficient combustion of the exhaust gas and avoid waste of the combustion-supporting gas.

[0020] Preferably, the signal input end of the microprocessor system is also connected to the signal output end of the thermocouple sensor, and the signal output end of the microprocessor system is connected to the signal input end of the igniter; the thermocouple sensor is connected and arranged on the side of the combustion chamber, and the ignition head of the igniter is arranged on the upper side of the exhaust gas exhaust port; the thermocouple sensor is used to measure whether the flame in the burner is extinguished, and when the flame is extinguished, if the ammonia concentration sensor can still detect ammonia, the microprocessor system controls the igniter to ignite until the thermocouple sensor detects the combustion temperature again. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following is a brief introduction to the drawings required for the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0022] Figure 1 A schematic diagram of the overall structure of a waste gas combustion purification device according to an embodiment of the utility model;

[0023] Figure 2 In the waste gas combustion purification device according to an embodiment of the utility model Figure 1 Schematic diagram of the internal structure;

[0024] Figure 3 A schematic diagram of the structure of a gas mixing device in a waste gas combustion purification device according to an embodiment of the utility model;

[0025] Figure 4 In the waste gas combustion purification device according to an embodiment of the utility model Figure 3 Schematic diagram of the cross-section structure. DETAILED DESCRIPTION

[0026] In order to make the above-mentioned purposes, features and advantages of the present invention more understandable, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0027] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0028] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the embodiments of the present invention, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general proportion, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0029] Secondly, the "one embodiment" or "embodiment" referred to herein refers to a specific feature, structure or characteristic that can be included in at least one implementation of the utility model. The "in one embodiment" that appears in different places in this specification does not refer to the same embodiment, nor is it a separate or selective embodiment that is mutually exclusive with other embodiments.

[0030] Example 1

[0031] Reference Figure 1 to Figure 4 This embodiment provides a waste gas combustion purification device, including a burner 1 for purifying waste gas combustion; the burner 1 is provided with a waste gas inlet 2 for introducing waste gas, and a combustion-supporting gas inlet 3 for introducing combustion-supporting gas.

[0032] The burner 1 includes a gas mixing device 4; the gas mixing device 4 includes an exhaust gas introduction part and a combustion-supporting gas introduction part; the exhaust gas introduction part includes a accommodating cavity and an exhaust gas inlet 2 connected to the side of the accommodating cavity, the accommodating cavity is called an exhaust gas chamber 7, and an exhaust gas exhaust port is arranged above the exhaust gas chamber 7; a combustion-supporting gas introduction part is arranged above the exhaust gas introduction part; the combustion-supporting gas introduction part includes an annular groove 5, and a combustion-supporting gas inlet is arranged on the side of the annular groove 5; an opening is arranged above the annular groove 5; the annular groove 5 cover is arranged above the exhaust gas exhaust port; the exhaust gas discharged from the exhaust gas exhaust port The exhaust gas is discharged upward through the middle of the annular groove 5; the burner 1 includes a mixing device, in which an exhaust gas chamber 7 is arranged, so that the exhaust gas can be evenly mixed with the combustion-supporting gas after being buffered by the exhaust gas chamber 7. Secondly, an annular groove 5 is arranged at the combustion-supporting gas (the combustion-supporting gas is oxygen) inlet part, and the combustion-supporting gas is evenly mixed with the exhaust gas discharged from the exhaust gas chamber 7 through multiple openings in the annular groove 5, so that the exhaust gas and the combustion-supporting gas are mixed more fully. Finally, the mixed gas is discharged upward from the hollow middle of the annular groove 5 to avoid the formation of a confined space that causes the mixed gas to explode and affect the purification effect.

[0033] A tubular metal cover is provided above the burner 1 as a combustion-supporting cover 6; the diameter of the combustion-supporting cover 6 is 1-2 times the diameter of the annular groove 5, and the height of the combustion-supporting cover 6 is 6-12 times the diameter of the annular groove 5; the utility model optimizes the exhaust gas combustion purification device, and after the optimization, a combustion-supporting cover 6 is provided on the burner 1, and the diameter of the combustion cover is 1-2 times the diameter of the annular groove 5, so that the mixed gas can be diffused and mixed more fully, and is controlled within 2 times the diameter to prevent the mixed gas from being too diluted and causing ignition difficulties. The height of the combustion-supporting cover 6 is maintained at 6-12 times the annular groove 5, so that the gas is sucked upward by the combustion cover, maintaining the continuous and uniform combustion effect of the burner 1, and the height of the combustion-supporting cover 6 is maintained within 12 times so that excessive suction of gas will not cause uneven combustion.

[0034] The exhaust chamber 7 is barrel-shaped, and the diameter of the exhaust chamber 7 is 10-20 times the diameter of the exhaust inlet 2; by setting the exhaust chamber 7 with a diameter 10-20 times the diameter of the exhaust inlet 2, the exhaust gas is initially buffered when entering the exhaust chamber 7, so that the exhaust gas and the combustion-supporting gas are mixed more fully.

[0035] The exhaust port is connected to a nozzle 8 for spraying exhaust gas. The nozzle 8 is made of copper, and jet holes are arranged on the side of the nozzle 8. Jet holes are arranged on the upper side of the nozzle 8, so that the exhaust gas can be sprayed out in multiple streams along the axis of the nozzle 8 vertically, which is helpful for mixing the exhaust gas with the combustion-supporting gas.

[0036] A one-way valve is also provided in the nozzle 8. When the exhaust gas in the exhaust chamber 7 reaches a certain pressure, the one-way valve is pushed open and sprayed from the jet hole into the combustion chamber to mix with the combustion-supporting gas for combustion. The one-way valve is provided in the nozzle 8 so that the pressure in the exhaust chamber 7 reaches a certain value before the exhaust gas is sprayed, to avoid the exhaust gas being too little to be able to carry out continuous combustion and purification. Secondly, the one-way valve can also prevent the combustion-supporting gas from entering the exhaust chamber 7 and causing the risk of explosion.

[0037] A filter element for filtering smoke in the exhaust gas is arranged at the exhaust gas inlet 2, and the filter element is made of alumina ceramics; the filter element filters out smoke in the exhaust gas to avoid clogging the jet holes or hindering the mixing of ammonia in the exhaust gas and the combustion-supporting gas.

[0038] During use, when the nitriding furnace discharges exhaust gas, the exhaust gas is connected to the exhaust gas inlet 2 of the burner 1 through the gas pipeline, and the alumina ceramic filter element in the exhaust gas inlet 2 filters out the smoke particles in the exhaust gas, and the filtered exhaust gas enters the exhaust chamber 7 and is stored, the exhaust gas transmission speed is slowed down, and the pressure in the exhaust chamber 7 is increased. When the pressure in the exhaust chamber 7 pushes open the one-way valve in the nozzle 8, it is ejected from the jet holes around the nozzle 8, and the combustion-supporting gas is evenly mixed with the exhaust gas in the jet holes through multiple openings in the annular groove 5, so as to achieve the purpose of uniform mixing of the exhaust gas and make the subsequent ignition and purification effect better.

[0039] Example 2

[0040] Reference Figure 1 and Figure 2 , which is the second embodiment of the utility model, and this embodiment is based on the previous embodiment.

[0041] The waste gas combustion control system is provided with a microprocessor system, the signal input end of the microprocessor system is connected to the signal output end of the ammonia concentration sensor, and the signal output end of the microprocessor system is connected to the signal input end of the electric control valve; the ammonia concentration sensor is arranged on the side of the exhaust port of the combustion chamber of the burner 1; the electric control valve is arranged in a pipeline connected to the combustion-supporting gas inlet 3 and the oxygen tank; when the waste gas is burned, the ammonia content in the waste gas is detected by the ammonia concentration sensor, and the electric control valve is controlled by the microprocessor system according to the data to adjust the intake amount of the combustion-supporting gas to ensure the full combustion of the waste gas and avoid the waste of the combustion-supporting gas. The model of the ammonia concentration sensor is RS485 for detecting the ammonia concentration, the model of the microprocessor system is ARM Cortex-M, and the model of the electric control valve is Q941F. The microprocessor system controls the combustion-supporting gas outlet of the electric control valve according to the ammonia concentration signal detected by the ammonia concentration sensor. The richer the ammonia, the more combustion-supporting gas there is, so that the waste gas combustion and purification are more complete.

[0042] The signal input end of the microprocessor system is also connected to the signal output end of the thermocouple sensor, and the signal output end of the microprocessor system is connected to the signal input end of the igniter 9; the thermocouple sensor is connected and arranged on the side of the combustion chamber, and the ignition head of the igniter 9 is arranged on the upper side of the exhaust gas outlet; the thermocouple sensor is used to measure whether the flame in the burner 1 is extinguished. When the flame is extinguished, if the ammonia concentration sensor can still detect ammonia, the microprocessor system controls the igniter 9 to ignite until the thermocouple sensor detects the combustion temperature again. The thermocouple sensor model is pt100, which detects the ammonia combustion temperature of 500-1000 degrees. The igniter 9 is an igniter 9 with an IES258 ignition controller.

[0043] During use, when the burner 1 starts working, the ammonia concentration sensor detects that ammonia is discharged, and the microprocessor system opens the electric control valve to introduce oxygen according to the concentration signal of the ammonia concentration sensor. Then the thermocouple sensor detects the temperature inside the combustion-supporting hood 6. If the temperature does not reach the ignition temperature of ammonia, the igniter 9 is controlled to ignite. During the combustion process, the lower the ammonia concentration detected by the ammonia concentration sensor, the smaller the electric control valve is, and the higher the ammonia concentration, the larger the electric control valve is, so as to achieve the purpose of avoiding waste of combustion-supporting gas when the ammonia is fully burned.

[0044] Importantly, it should be noted that the construction and arrangement of the present application shown in a plurality of different exemplary embodiments are only exemplary. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible (e.g., the size, scale, structure, shape and ratio of various elements, and parameter values ​​(e.g., temperature, pressure, etc.), installation arrangements, use of materials, color, directional changes, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in the application. For example, the element shown as integrally formed can be composed of multiple parts or elements, the position of the element can be inverted or otherwise changed, and the nature or number or position of the discrete element can be changed or changed. Therefore, all such modifications are intended to be included in the scope of the present utility model. The order or sequence of any process or method steps can be changed or reordered according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure described herein that performs the function, and is not only structurally equivalent but also an equivalent structure. Without departing from the scope of the present invention, other substitutions, modifications, changes and omissions may be made in the design, operating conditions and arrangement of the exemplary embodiments. Therefore, the present invention is not limited to a specific embodiment, but extends to various modifications that still fall within the scope of the appended claims.

[0045] Additionally, in order to provide a concise description of example embodiments, all features of an actual embodiment (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those that are not relevant to implementing the invention) may not be described.

[0046] It should be understood that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but for those of ordinary skill having the benefit of this disclosure, without undue experimentation, the development effort will be a routine task of design, fabrication, and production.

[0047] It should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A waste gas combustion purification device, comprising a burner for purifying waste gas, wherein the burner is provided with a waste gas inlet for introducing waste gas and a combustion-supporting gas inlet for introducing combustion-supporting gas, characterized in that: The burner includes a gas mixing device; The gas mixing device includes an exhaust gas introduction part and a combustion-supporting gas introduction part; The exhaust gas introduction part includes a accommodating cavity and an exhaust gas inlet connected to the side of the accommodating cavity. The accommodating cavity is called an exhaust gas chamber, and an exhaust gas exhaust port is arranged above the exhaust gas chamber. A combustion-supporting gas introduction portion is provided above the exhaust gas introduction portion; The combustion-supporting gas introduction part comprises an annular groove, a combustion-supporting gas inlet is arranged on the side of the annular groove, and an opening is arranged above the annular groove; The annular groove cover is arranged above the exhaust gas outlet; The exhaust gas discharged from the exhaust port is discharged upward through the middle part of the annular groove cover.

2. The exhaust gas combustion purification device according to claim 1, characterized in that: The burner is covered with a tubular metal cover as a combustion-supporting cover; The diameter of the combustion-supporting hood is 1-2 times the diameter of the annular groove, and the height of the combustion-supporting hood is 5-8 times the height of the annular groove.

3. The exhaust gas combustion purification device according to claim 2, characterized in that: The exhaust gas chamber is barrel-shaped, and the diameter of the exhaust gas chamber is 10-20 times the diameter of the exhaust gas inlet.

4. The exhaust gas combustion purification device according to claim 3, characterized in that: The exhaust gas outlet is connected to a nozzle for spraying exhaust gas, the nozzle is made of copper, and jet holes are arranged on the side of the nozzle.

5. The exhaust gas combustion purification device according to claim 4, characterized in that: A one-way valve is also provided in the nozzle. When the exhaust gas in the exhaust gas chamber reaches a certain pressure, the one-way valve is pushed open and sprayed from the jet hole into the combustion chamber to mix with the supporting combustion gas for combustion.

6. The exhaust gas combustion purification device according to claim 5, characterized in that: A filter element for filtering smoke and dust in the exhaust gas is arranged at the exhaust gas inlet, and the filter element is made of alumina ceramics.

7. The exhaust gas combustion purification device according to any one of claims 1 to 6, characterized in that: Also included is an exhaust combustion control system; The exhaust gas combustion control system is provided with a microprocessor system, the signal input end of the microprocessor system is connected to the signal output end of the ammonia concentration sensor, and the signal output end of the microprocessor system is connected to the signal input end of the electric control valve; The ammonia concentration sensor is arranged on the side of the exhaust port of the combustion chamber of the burner; The electric control valve is arranged in a pipeline connecting the combustion-supporting gas inlet and the oxygen tank.

8. The exhaust gas combustion purification device according to claim 7, characterized in that: The signal input end of the microprocessor system is also connected to the signal output end of the thermocouple sensor, and the signal output end of the microprocessor system is connected to the signal input end of the igniter; The thermocouple sensor is connected to the side of the combustion chamber; The ignition head of the igniter is arranged above the exhaust gas outlet.

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