Self-circulating combustion system for waste gas treatment for heat treatment of bearing steel balls

Abstract

The present invention provides a waste gas treatment self-circulating combustion system for heat treatment of bearing steel balls, which belongs to the technical field of waste gas treatment systems and comprises a waste gas combustion chamber, wherein the waste gas combustion chamber is connected to a quenching oil tank through a second gas pipeline, the waste gas combustion chamber is connected to a sedimentation tank through an exhaust pipe, a first gas pipeline is further connected between the waste gas combustion chamber and the sedimentation tank, the waste gas combustion chamber is connected to a high-temperature quenching furnace, and the bottom end of the waste gas combustion chamber is an air supply structure; the present invention combines a steel ball heat treatment device to form a waste gas self-circulating combustion treatment system, thereby improving the effect of waste gas treatment and reducing the cost of waste gas treatment.

Description

Technical Field

[0001] The invention relates to the technical field of waste gas treatment systems, and in particular to a waste gas treatment self-circulating combustion system for heat treatment of bearing steel balls. Background Art

[0002] In order to ensure that the bearing steel ball has a long service life and reliability in operation, the steel ball must be heat treated. Steel ball heat treatment is one of the important processes in mechanical manufacturing. Heat treatment does not change the shape and overall chemical composition of the workpiece, but by changing the microstructure inside the workpiece, or changing the chemical composition of the workpiece surface, to give or improve the performance of the workpiece, so that the steel ball workpiece has the required mechanical properties, physical properties and chemical properties.

[0003] The heat treatment process of steel balls generally includes annealing, quenching, tempering, surface heat treatment, etc. Quenching refers to the process in which the workpiece is heated to a temperature above the phase transition temperature in the furnace and maintained for a certain period of time, the metallographic structure of the material changes, and then it is quickly cooled in the coolant to obtain martensite. At present, during the quenching treatment of steel balls, the steel balls are poured into the oil tank for cooling during the cooling stage. When cooling in the oil tank, VOCs organic waste gas is generated in the oil tank due to the high temperature. These organic waste gases will cause air pollution and endanger human health. They need to be treated before they can be discharged. At present, the treatment of VOCs organic waste gas is carried out by activated carbon adsorption filtration. The treatment effect is not good, and the activated carbon adsorption filter element needs to be frequently replaced, which increases the cost of waste gas treatment and the cost of manual management. Summary of the invention

[0004] In view of this, the present invention provides a waste gas treatment self-circulating combustion system for heat treatment of bearing steel balls, which is combined with a steel ball heat treatment device to form a waste gas self-circulating combustion treatment system, thereby improving the effect of waste gas treatment and reducing the cost of waste gas treatment.

[0005] In order to solve the above technical problems, the present invention provides a waste gas treatment self-circulating combustion system for heat treatment of bearing steel balls, including a waste gas combustion chamber, which is connected to a quenching oil tank through a second gas pipe, and is connected to a sedimentation tank through an exhaust pipe. A first gas pipe is also connected between the waste gas combustion chamber and the sedimentation tank, and one end of the first gas pipe connected to the waste gas combustion chamber is an ejector pipe body extending into the waste gas combustion chamber, the waste gas combustion chamber is connected to a high-temperature quenching furnace, and the bottom end of the waste gas combustion chamber is an air supply structure.

[0006] Furthermore, an end of the exhaust gas combustion chamber opposite to the high-temperature quenching furnace is provided with a baffle plate that can be adjusted upward and downward, and an ignition gap is formed between the bottom of the baffle plate and the bottom surface of the exhaust gas combustion chamber.

[0007] Furthermore, one end of the second air pipe connected to the exhaust gas combustion chamber extends into the exhaust gas combustion chamber from the side and the port of the extending end is a closed end. A plurality of air outlet holes are provided on the side of the extending end of the second air pipe extending into the exhaust gas combustion chamber and an arc-shaped deflector is provided on the extending end for deflecting the airflow toward the combustion zone.

[0008] Furthermore, a second induced draft fan connecting the second air supply pipe and the quenching oil tank is provided on the upper surface of the quenching oil tank.

[0009] Furthermore, a first induced draft fan connecting the first air supply pipe and the sedimentation box is provided on the upper surface of the sedimentation box.

[0010] Furthermore, one end of the exhaust pipe connected to the sedimentation tank extends into the sedimentation tank and extends from top to bottom into the sedimentation liquid in the sedimentation tank.

[0011] Furthermore, the exhaust pipe is provided with a cooling shell which is airtightly sealed and wrapped outside the exhaust pipe, and a second cooling cavity is formed between the cooling shell and the exhaust pipe.

[0012] Furthermore, the diameter of the ejector tube body gradually decreases from the air inlet end to the air outlet end, an upper guide plate is provided in the exhaust gas combustion chamber, a lower guide plate is provided below the upper guide plate, a guide cavity is formed between the upper guide plate and the lower guide plate, the air outlet end of the ejector tube body is connected to the guide cavity, and the air outlet of the guide cavity points to the combustion zone.

[0013] Furthermore, the air supply structure is an air supply port arranged at the bottom end of the exhaust gas combustion chamber, and a louver air supply port is arranged on the lower guide plate.

[0014] Furthermore, the exhaust gas combustion chamber is arranged on a steel ball conveying mechanism for conveying steel balls into a high-temperature quenching furnace, an air supply gap is formed between the air supply port and the conveyor belt of the steel ball conveying mechanism, and the louver air supply port and the air supply gap flow in correspondence.

[0015] The beneficial effects of the above technical solution of the present invention are as follows:

[0016] 1. In the present invention, a waste gas self-circulating combustion treatment system is formed by combining a steel ball heat treatment device, which is easy to modify, improves the effect of waste gas treatment, reduces the cost of waste gas treatment, and reduces the frequency of human maintenance.

[0017] 2. In the present invention, the quenching temperature in the high-temperature quenching box is as high as 800-880°C. The high-temperature quenching furnace is used to provide the combustion conditions required for the combustion of the waste gas, so that the flammable VOCs organic waste gas can be burned in the waste gas combustion chamber, making reasonable use of the conditions of existing equipment.

[0018] 3. In the present invention, when the waste gas is burning in the combustion chamber and through the action of the ejector tube, a negative pressure environment is generated, and the external space enters the waste gas combustion chamber through the air supply port, automatically replenishing the oxygen required for the combustion of the VOCs organic waste gas, thereby realizing the self-circulating combustion treatment of the waste gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of a waste gas treatment self-circulating combustion system for heat treatment of bearing steel balls of the present invention;

[0020] Figure 2 It is a side view of the exhaust gas combustion chamber and the steel ball conveyor belt in the present invention;

[0021] Figure 3 is an internal schematic diagram of the exhaust gas combustion chamber of the present invention;

[0022] Figure 4 It is a structural schematic diagram of the connection between the second gas delivery pipe and the arc-shaped baffle plate of the present invention;

[0023] Figure 5 is a schematic diagram of an exhaust pipe in the present invention;

[0024] Figure 6 It is a top view of the matching between the baffle plate and the card slot in the present invention;

[0025] Figure 7 It is a side view of the adjustment bracket used for adjusting the baffle plate in the present invention.

[0026] 1. High temperature quenching furnace; 11. Baffle plate;

[0027] 2. Steel ball conveying mechanism; 21. Conveyor belt; 22. Side guard plate;

[0028] 3. Waste gas combustion chamber; 31. Outer wall; 32. First cooling chamber; 33. Inner wall; 34. Air supply port;

[0029] 35. Card slot; 36. Lower guide plate; 361. Louver air supply port; 37. Upper guide plate;

[0030] 4. Sedimentation box; 41. Glass observation window; 42. First induced draft fan; 43. First air delivery pipe; 431. Ejector pipe body; 44. Exhaust pipe; 441. Cooling shell; 442. Second cooling chamber;

[0031] 5. Quenching oil tank; 51. Second induced draft fan; 52. Second air delivery pipe; 521. Arc baffle;

[0032] 6. L-shaped bracket; 61. hand wheel; 62. screw rod; 63. bearing. DETAILED DESCRIPTION

[0033] To make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the following will be combined with the appended drawings of the embodiments of the present invention. Figure 1-6 , the technical scheme of the embodiment of the present invention is clearly and completely described. Obviously, the described embodiment is a part of the embodiment of the present invention, not all of the embodiments. Based on the described embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present invention.

[0034] like Figure 1-5 As shown:

[0035] A waste gas treatment self-circulating combustion system for heat treatment of bearing steel balls includes a waste gas combustion chamber 3, which is connected to a quenching oil tank 5 through a second air pipe 52, and is connected to a sedimentation tank 4 through an exhaust pipe 44. A first air pipe 43 is also connected between the waste gas combustion chamber 3 and the sedimentation tank 4, and one end of the first air pipe 43 connected to the waste gas combustion chamber 3 is an ejector pipe body 431 extending into the waste gas combustion chamber 3, the waste gas combustion chamber 3 is connected to a high-temperature quenching furnace 1, and the bottom end of the waste gas combustion chamber 3 is an air supply structure.

[0036] By combining the steel ball heat treatment device to form a waste gas self-circulating combustion treatment system, it is easy to modify, improve the effect of waste gas treatment, reduce the cost of waste gas treatment, and reduce the frequency of human maintenance.

[0037] The quenching temperature in the high temperature quenching furnace 1 is as high as 800-880°C. The high temperature quenching furnace 1 is used to provide the combustion conditions required for the exhaust gas combustion, so that the flammable VOCs organic exhaust gas can be burned in the exhaust gas combustion chamber 3, making reasonable use of the conditions of existing equipment.

[0038] According to one embodiment of the present invention, Figure 1 , 3 As shown,

[0039] Among them, one end of the second air supply pipe 52 connected to the exhaust gas combustion chamber 3 extends into the exhaust gas combustion chamber 3 from the side and the port of the extending end is a closed end. The side surface of the extending end of the second air supply pipe 52 extending into the exhaust gas combustion chamber 3 is provided with a plurality of air outlet holes and the extending end is provided with an arc-shaped deflector 521 for deflecting the airflow to the combustion zone.

[0040] The upper surface of the quenching oil tank 5 is provided with a second induced draft fan 51 which is connected with the second air delivery pipe 52 and the quenching oil tank 5 .

[0041] The exhaust gas is introduced into the combustion zone through the second air supply pipe 52 for combustion. The exhaust gas is guided to the combustion zone by the baffle effect of the arc-shaped baffle plate 521, thereby improving the combustion efficiency from the quenching oil tank 5 to the exhaust gas combustion chamber 3, and avoiding the exhaust gas being discharged through the exhaust pipe 44 without being burned.

[0042] According to one embodiment of the present invention, Figure 1 , 5 , 6,

[0043] The end of the exhaust gas combustion chamber 3 opposite to the high-temperature quenching furnace 1 is provided with a baffle plate 11 that can be adjusted upward and downward, and an ignition gap is formed between the bottom of the baffle plate 11 and the bottom surface of the exhaust gas combustion chamber 3 .

[0044] The specific structure may be that both sides of the exhaust gas combustion chamber 3 are provided with clamping grooves 35 for clamping the baffle plate 11, and the baffle plate 11 can be adjusted to move up and down in the clamping grooves 35, thereby adjusting the size of the ignition gap.

[0045] When the baffle plate 11 moves up and down, it can be Figure 6 The adjustment bracket shown is driven, and the adjustment bracket includes an L-shaped bracket 6, a screw 62 vertically penetrates the horizontal plate of the L-shaped bracket 6, and a threaded hole matching the screw 62 is provided on the horizontal plate. A handwheel 61 is provided at the top of the screw 62, and a bearing 63 connected to the top of the baffle plate 11 is provided at the bottom.

[0046] The adjusting bracket can be fixedly arranged on the upper surface of the high-temperature quenching furnace 1 , and the upper end of the baffle plate 11 extends upward, and the baffle plate 11 is driven to move up and down by rotating the lead screw 62 .

[0047] According to one embodiment of the present invention, Figure 1 , 4 As shown,

[0048] The upper surface of the sedimentation box 4 is provided with a first induced draft fan 42 which is connected with a first air supply pipe 43 and the sedimentation box 4 .

[0049] One end of the exhaust pipe 44 connected to the sedimentation tank 4 extends into the sedimentation tank 4 and extends from top to bottom into the sedimentation liquid in the sedimentation tank 4.

[0050] The exhaust pipe 44 is provided with a cooling shell 441 which is airtightly sealed and wrapped outside the exhaust pipe 44 , and a second cooling cavity 442 is formed between the cooling shell 441 and the exhaust pipe 44 .

[0051] According to one embodiment of the present invention, Figure 2 , 3 As shown,

[0052] Among them, the diameter of the ejector tube body 431 gradually decreases from the air inlet end to the air outlet end, an upper guide plate 37 is provided in the exhaust gas combustion chamber 3, a lower guide plate 36 is provided below the upper guide plate 37, a guide cavity is formed between the upper guide plate 37 and the lower guide plate 36, the air outlet end of the ejector tube body 431 is connected to the guide cavity, and the air outlet of the guide cavity points to the combustion zone.

[0053] The air supply structure is an air supply port 34 disposed at the bottom end of the exhaust gas combustion chamber 3 , and a louvered air supply port 361 is disposed on the lower guide plate 36 .

[0054] Among them, the exhaust gas combustion chamber 3 is arranged on a steel ball conveying mechanism 2 for conveying steel balls into the high-temperature quenching furnace 1, an air supply gap is formed between the air supply port 34 and the conveyor belt 21 of the steel ball conveying mechanism 2, and the louver air supply port 361 flows correspondingly with the air supply gap.

[0055] Among them, the pipe diameter outlet of the ejector tube body 431 is a tapered structure. When the reflowing exhaust gas flows out from the tapered portion, the gas flow rate increases, the air flow rate increases, the pressure decreases, and flows through the louvered air supply port 361, so that the outside air enters the louvered air supply port 361 through the air supply gap through the air supply port 34. The introduction of outside air can supplement the oxygen required for combustion.

[0056] The working method of the present invention is as follows: the bearing steel balls are transported to the high-temperature quenching furnace 1 through the steel ball conveying mechanism 2, and after being subjected to high-temperature treatment for a period of time, they enter the quenching oil tank 5 for cooling. Due to the high temperature, the quenching oil tank 5 produces flammable vocs organic waste gas, which is introduced into the waste gas combustion chamber 3 through the second induced draft fan 51 and the second gas pipe 52. The waste gas combustion chamber 3 is connected to the high-temperature quenching furnace 1. The organic waste gas vocs has a low ignition point, and the combustion method is the most thorough method. Method one, generally with a removal rate of more than 99%, the VOCs organic waste gas introduced into the exhaust gas combustion chamber 3 from the quenching oil tank 5 is ignited and burned under high temperature, and the hot gas with ash after combustion is discharged into the sedimentation tank 4 through the exhaust pipe 44 at the top of the exhaust gas combustion chamber 3, and passed into the sedimentation liquid, i.e. water, in the sedimentation tank 4, and the combustion impurities are filtered out by water. The unburned organic waste gas that enters the sedimentation tank 4 will enter the exhaust gas combustion chamber 3 again through the first gas pipe 43 for combustion to realize the cyclic combustion treatment.

[0057] During the combustion process in the exhaust gas combustion chamber 3, the ejector tube body 431 with a constricted structure accelerates the flow velocity at the outlet when the gas is ejected, which reduces the pressure near the outlet and forms a negative pressure, making it easier to replenish the oxygen required for combustion from the air supply port 34, that is, the external space enters the exhaust gas combustion chamber through the air supply port 34, automatically replenishes the oxygen required for the combustion of the VOCs organic waste gas, and cooperates to achieve the self-circulating combustion treatment of the exhaust gas. While forming a negative pressure, it is also easier to ignite from the ignition gap, making it easier to ignite.

[0058] In the present invention, unless otherwise clearly stipulated and limited, for example, it can be a fixed connection, a detachable connection, or an integrated one; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, for ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0059] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. Exhaust gas treatment self-circulating combustion system for heat treatment of bearing steel balls, characterized by: The invention comprises an exhaust gas combustion chamber (3), wherein the exhaust gas combustion chamber (3) is connected to a quenching oil tank (5) via a second air delivery pipe (52), the exhaust gas combustion chamber (3) is connected to a sedimentation tank (4) via an exhaust pipe (44), a first air delivery pipe (43) is further connected between the exhaust gas combustion chamber (3) and the sedimentation tank (4), one end of the first air delivery pipe (43) connected to the exhaust gas combustion chamber (3) is an ejector pipe body (431) extending into the exhaust gas combustion chamber (3), the exhaust gas combustion chamber (3) is connected to a high-temperature quenching furnace (1), and the high-temperature quenching furnace (1) is used to provide the combustion conditions required for exhaust gas combustion, so that flammable VOCs organic waste gas can be burned in the exhaust gas combustion chamber (3), and the quenching oil tank (5) is introduced into the exhaust gas combustion chamber (3). The VOCs organic waste gas entering the waste gas combustion chamber (3) is ignited and burned under the action of high temperature, and the bottom end of the waste gas combustion chamber (3) is an air supply structure; the end of the waste gas combustion chamber (3) opposite to the high-temperature quenching furnace (1) is provided with a baffle plate (11) that is easy to adjust up and down, and an ignition gap is formed between the bottom of the baffle plate (11) and the bottom surface of the waste gas combustion chamber (3); one end of the second gas supply pipe (52) connected to the waste gas combustion chamber (3) extends from the side into the waste gas combustion chamber (3) and the port of the extension end is a closed end, and the side of the extension end of the second gas supply pipe (52) extending into the waste gas combustion chamber (3) is provided with a plurality of air outlet holes, and the extension end is provided with an arc-shaped deflector (521) for deflecting the airflow to the combustion zone.

2. The exhaust gas treatment self-circulating combustion system for heat treatment of bearing steel balls according to claim 1, characterized in that: A second induced draft fan (51) communicating with the second air delivery pipe (52) and the quenching oil tank (5) is provided on the upper surface of the quenching oil tank (5).

3. The exhaust gas treatment self-circulating combustion system for heat treatment of bearing steel balls according to claim 1, characterized in that: The upper surface of the sedimentation box (4) is provided with a first induced draft fan (42) which is in communication with the first air delivery pipe (43) and the sedimentation box (4).

4. The exhaust gas treatment self-circulating combustion system for heat treatment of bearing steel balls as claimed in claim 3, characterized in that: One end of the exhaust pipe (44) connected to the sedimentation tank (4) extends into the sedimentation tank (4) and extends from top to bottom into the sedimentation liquid in the sedimentation tank (4).

5. The exhaust gas treatment self-circulating combustion system for heat treatment of bearing steel balls according to claim 4, characterized in that: The exhaust pipe (44) is provided with a cooling shell (441) which is airtightly sealed and wrapped outside the exhaust pipe (44), and a second cooling cavity (442) is formed between the cooling shell (441) and the exhaust pipe (44).

6. The exhaust gas treatment self-circulating combustion system for heat treatment of bearing steel balls according to claim 1, characterized in that: The diameter of the ejector tube body (431) gradually decreases from the air inlet end to the air outlet end; an upper guide plate (37) is provided in the exhaust gas combustion chamber (3); a lower guide plate (36) is provided in the air below the upper guide plate (37); a guide cavity is formed between the upper guide plate (37) and the lower guide plate (36); the air outlet end of the ejector tube body (431) is connected to the guide cavity; and the air outlet of the guide cavity points to the combustion zone.

7. The exhaust gas treatment self-circulating combustion system for heat treatment of bearing steel balls according to claim 6, characterized in that: The air supply structure is an air supply port (34) provided at the bottom end of the exhaust gas combustion chamber (3), and a louvered air supply port (361) is provided on the lower guide plate (36).

8. The exhaust gas treatment self-circulating combustion system for heat treatment of bearing steel balls according to claim 7, characterized in that: The exhaust gas combustion chamber (3) is arranged on a steel ball conveying mechanism (2) for conveying steel balls into a high-temperature quenching furnace (1); an air supply gap is formed between the air supply port (34) and a conveyor belt (21) of the steel ball conveying mechanism (2); and the louvered air supply port (361) is in flow correspondence with the air supply gap.

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