Incinerator without combustion fan

Abstract

The utility model relates to the technical field of incinerators, in particular to an incinerator without a combustion fan, which comprises an incinerator body, and a waste gas inlet and a flue gas outlet are respectively formed on the incinerator body. Wherein a combustor is further installed on a front end plate of the incinerator body, a wind shield is fixedly connected to the inner side of the incinerator body through a support assembly, and the wind shield is used for separating a blocking space on the inner side of the incinerator body. According to the low-concentration waste gas incineration device, the problems that in the low-concentration waste gas incineration process, fuel consumption is too large, and energy is wasted are effectively solved, meanwhile, the purchase cost of a combustion fan and power consumption in the operation process are saved, meanwhile, the smoke amount generated by incineration is reduced, and the volume of a hearth can be smaller under the same waste gas retention time and the same hearth temperature condition.

Description

Technical Field

[0001] The utility model relates to the technical field of incinerators, in particular to an incinerator without a combustion-supporting fan. Background Art

[0002] The treatment of industrial waste gas is an important part of environmental protection. Especially in the industrial production process, the waste gas generated often contains harmful substances, posing a threat to the environment and human health. As an efficient waste gas treatment technology, the incineration method can convert the harmful substances in the waste gas into harmless substances, effectively reducing environmental pollution. However, this method has certain limitations when dealing with low-concentration waste gas, especially the problem of fuel consumption.

[0003] In the incineration method, in order to ensure the full combustion of harmful components in the waste gas, it is necessary to mix the waste gas with an appropriate amount of air. In this process, the role of the combustion-supporting fan is indispensable. It is responsible for blowing air into the incinerator furnace to support the combustion process. However, when dealing with low-concentration waste gas, the combustion-supporting fan blows in normal-temperature air into the furnace, which means that a large amount of energy is required to heat this part of the air to the operating temperature of the furnace, usually between 750°C and 850°C. This process not only consumes a large amount of fuel but also causes energy waste and increases the operating cost of the enterprise. Summary of the Utility Model

[0004] The purpose of the utility model is to solve the above-mentioned disadvantages existing in the prior art, and to propose an incinerator without a combustion-supporting fan.

[0005] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0006] Design an incinerator without a combustion-supporting fan, including a furnace body, on which a waste gas inlet and a flue gas outlet are respectively formed;

[0007] Wherein, a burner is further installed on the front end plate of the furnace body, and a wind baffle is fixedly connected to the inner side of the furnace body through a bracket assembly. The wind baffle is used to separate a blocking space inside the furnace body, and both the waste gas inlet and the burner are communicated with the blocking space.

[0008] Further, the wind baffle includes a front baffle, a connecting part, and a rear baffle. The connecting part is fixed between the front baffle and the rear baffle. The connecting part is vertically opposite to the waste gas inlet, and a connecting hole is formed on the end face of the front baffle.

[0009] Further, a plurality of through holes are further distributed on the end face of the front baffle.

[0010] Further, the opening ratio of the through holes on the front baffle is 5%-10%.

[0011] Further, the support assembly includes a strut fixed in the furnace body, and an arc plate is fixedly installed at the top of the strut. Among them, the arc plate is in fit with and fixedly connected to the connecting portion.

[0012] Further, it further includes an upstream pressure tapping pipe and a downstream pressure tapping pipe. The upstream pressure tapping pipe communicates with the barrier space, and the downstream pressure tapping pipe communicates with the space behind the wind deflector in the furnace body.

[0013] Further, the burner includes an installation shell. A main fuel interface and an auxiliary fuel interface are communicated on the front side of the installation shell. A compressed air interface and a spark plug are communicated on one side of the auxiliary fuel interface.

[0014] A heat insulation layer and a bell mouth are sequentially arranged on the rear side of the installation shell, and a plurality of oblong holes are formed on the surface of the bell mouth.

[0015] Further, an ultraviolet flame detector and a fire viewing hole are also installed on the front side of the installation shell.

[0016] Further, the burner is fixedly connected to the furnace body through fasteners.

[0017] Further, the furnace body includes a housing and a heat insulation layer installed inside the housing.

[0018] An incinerator without a combustion-supporting fan proposed by the present utility model has the beneficial effects that:

[0019] This incinerator innovatively eliminates the combustion-supporting fan, avoiding blowing combustion-supporting air into the furnace chamber, effectively solving the problems of excessive fuel consumption and energy waste during the incineration of low-concentration waste gas. At the same time, the procurement cost of the combustion-supporting fan and the power consumption cost during operation are saved. This also reduces the amount of flue gas generated by incineration, making the furnace chamber volume smaller under the same waste gas residence time and furnace chamber temperature conditions, thereby reducing the initial equipment investment. The reduction in the amount of flue gas also means a reduction in emissions, and under the condition of recovering the same amount of heat, the system flue gas discharge temperature is lower;

[0020] In addition, by designing the distance between the wind deflector and the heat insulation layer, the waste gas flow rate is effectively controlled; at the same time, by adjusting the diameter and quantity of the ventilation holes on the wind deflector, the pressure difference of the waste gas passing through the burner and the wind deflector can be controlled to ensure the stable operation of the burner and achieve full combustion of the waste gas. By adjusting the opening ratio of the ventilation holes on the wind deflector, the operation flexibility of the waste gas flow rate is improved, meeting the requirements of different process production conditions. Description of the Drawings

[0021] Figure 1 is a perspective view of the present utility model;

[0022] Figure 2 This is a sectional view of the furnace body of the present utility model;

[0023] Figure 3 This is a schematic structural view of the wind deflector of the present utility model;

[0024] Figure 4 This is the front view of the burner of the present utility model;

[0025] Figure 5 This is the three-dimensional view of the burner of the present utility model.

[0026] In the figure: 1. Furnace body; 11. Outer shell; 12. Heat insulation layer; 2. Exhaust gas inlet; 3. Flue gas outlet; 4. Burner; 41. Installation shell; 42. Main fuel interface; 43. Auxiliary fuel interface; 44. Compressed air interface; 45. Spark plug; 46. Heat preservation and heat insulation layer; 47. Bell mouth; 471. Long circular hole; 48. Ultraviolet flame detector; 49. Fire viewing hole; 5. Bracket assembly; 51. Support rod; 52. Arc-shaped plate; 6. Wind deflector; 61. Front baffle; 62. Connection part; 63. Rear baffle; 64. Connection hole; 65. Through hole; 7. Blocking space; 8. Upstream pressure tapping pipe; 9. Downstream pressure tapping pipe; 10. Fastener. Specific embodiments

[0027] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments.

[0028] Referring to Figures 1-5 One embodiment of the present utility model discloses an incinerator without a combustion-supporting fan, which is used to solve the problem of excessive fuel consumption and energy waste when low-concentration exhaust gas is incinerated; at the same time, when the exhaust gas flow rate is adjusted, the incinerator can maintain stable operation. Specifically, the incinerator includes a furnace body 1, and an exhaust gas inlet 2 and a flue gas outlet 3 are respectively formed on the furnace body 1. Specifically, in this embodiment, the exhaust gas inlet 2 and the flue gas outlet 3 are respectively circular and square flange interfaces, and the material is Q345R steel. The size is designed according to the gas flow rate. Generally, the gas flow rate is calculated at 10-15 m / s;

[0029] Among them, a burner 4 is further installed on the front end plate of the furnace body 1, and a wind deflector 6 is fixedly connected to the inner side of the furnace body 1 through a bracket assembly 5. The wind deflector 6 is used to separate a blocking space 7 inside the furnace body 1. Both the exhaust gas inlet 2 and the burner 4 are communicated with the blocking space 7. The wind deflector 6 is to block the exhaust gas and prevent the exhaust gas from directly entering the subsequent furnace body 1. The purpose is to allow the exhaust gas to pass through the bell mouth 47 of the burner 4 and provide sufficient oxygen for the combustion of the burner 4.

[0030] In some embodiments, the windshield 6 in the present invention includes a front baffle 61, a connecting portion 62 and a rear baffle 63. The connecting portion 62 is fixed between the front baffle 61 and the rear baffle 63. Specifically, the connecting portion 62 in this embodiment is a tubular structure for connecting the front baffle 61 and the rear baffle 63, that is, the cross-section of the windshield 6 in this embodiment is a convex structure. The connecting portion 62 is opposite to the exhaust gas inlet 2 up and down, and a connecting hole 64 is opened on the end face of the front baffle 61. The connecting hole 64 is used to connect the burner 4. Of course, the connecting hole 64 extends along the connecting portion 62 to the rear of the rear baffle 63.

[0031] In addition, in this embodiment, a number of through holes 65 are distributed on the end face of the front baffle 61, and the opening rate of the through holes 65 on the front baffle 61 is 5%-10%. Preferably, the windshield 6 in this embodiment is made of S31008 stainless steel as a whole, with a thickness of ≥6mm, wherein the dimensions of the front baffle 61 and the rear baffle 63 are designed according to the gas flow rate, generally calculated as 15-20m / s; the diameter and number of the through holes 65 are designed according to the flow rate of the gas through the windshield 6, so the general opening rate is 5%-10%.

[0032] On the basis of the above embodiment, the bracket assembly 5 in this embodiment includes a support rod 51 fixed in the furnace body 1, and an arc plate 52 is fixedly installed on the top of the support rod 51, wherein the arc plate 52 is in contact with the connecting portion 62 and is connected and fixed. Specifically, the bracket assembly 5 in this embodiment is also made of S31008 stainless steel, wherein the arc plate 52 is made of ≥6mm steel plate with an arc of 1 20°, and the support rod 51 is made of L50x3 or larger angle steel, and the number is preferably 3.

[0033] Furthermore, the embodiment of the present invention also includes an upstream pressure-taking pipe 8 and a downstream pressure-taking pipe 9. The upstream pressure-taking pipe 8 is connected to the barrier space 7, and the downstream pressure-taking pipe 9 is connected to the rear space of the furnace body 1 located at the wind shield 6. The rear space is the space on the other side of the wind shield 6 away from the barrier space 7. In this embodiment, the upstream pressure-taking pipe 8 and the downstream pressure-taking pipe 9 are made of Φ19x2 steel pipes, and the material is S31008 stainless steel. The upstream pressure-taking pipe 8 passes through the insulation layer 12, and the downstream pressure-taking pipe 9 passes through the wind shield 6.

[0034] In a further embodiment, the burner 4 of the present invention includes a mounting shell 41 , a main fuel interface 42 and an auxiliary fuel interface 43 are connected on the front side of the mounting shell 41 , and a compressed air interface 44 and a spark plug 45 are connected on one side of the auxiliary fuel interface 43 ;

[0035] A heat-insulating layer 46 and a bell mouth 47 are sequentially arranged at the rear side of the installation shell 41. Specifically, in this embodiment, the heat-insulating layer 46 is a pipe fitting sleeved on the rear side part of the installation shell 41, and the space between the pipe fitting and the sleeved part of the rear side of the installation shell 41 is filled with aluminosilicate heat-insulating cotton. The installation shell 41 is communicated with the bell mouth 47 to convey fuel, and the bell mouth 47 is made of 625 alloy steel.

[0036] In addition, an ultraviolet flame detector 48 and a fire viewing hole 49 are installed on the front side of the installation shell 41 in this embodiment. A plurality of oblong holes 471 are formed on the surface of the bell mouth 47, and the above interface sizes are matched according to the power of the burner.

[0037] In order to disassemble the burner 4, in this embodiment, the burner 4 is fixedly connected to the furnace body 1 through a fastener 10. Preferably, the fastener 10 in this embodiment is set as an 8.8-grade bolt. A bolt hole is formed on the outer side of the installation shell 41, and the bolt passes through the bolt hole and is threadedly connected to the furnace body 1.

[0038] It should be noted that the furnace body 1 in this embodiment includes an outer shell 11 and a heat-insulating layer 12 installed inside the outer shell 11. The outer shell 11 is made of Q345R steel, and the thickness is determined according to the diameter and weight of the incinerator. Generally, the thickness of a small incinerator (minimum diameter ≥ 600 mm) is not less than 6 mm, and the thickness of a large incinerator (maximum diameter ≤ 6000 mm) does not exceed 52 mm.

[0039] In addition, the heat-insulating layer 12 is a ceramic fiber module, and the thickness is determined according to the operating temperature of the incinerator furnace. Generally, the thickness is ≥ 250 mm at 700 °C - 900 °C and ≥ 300 mm at 900 °C - 1100 °C.

[0040] During specific operation, the waste gas containing VOCs enters the incinerator from the waste gas inlet 2. Generally, the waste gas will be preheated to above 500 °C to save fuel consumption. For this equipment, the highest temperature after preheating the upstream waste gas is set not to exceed 600 °C. Since the wind deflector 6 is arranged inside the incinerator, after the waste gas enters the incinerator, it can only flow along the wind deflector 6, specifically as Figure 1 shown by the arrow direction, pass through the bell mouth 47 of the burner 4, and after passing through the oblong holes 471 on the surface of the bell mouth 47, go to the rear part of the incinerator and be discharged from the flue gas outlet 3.

[0041] While the exhaust gas passes through the flare 47 of the burner 4, natural gas is sent to the main fuel interface 42 and the auxiliary fuel interface 43, compressed air is sent to the compressed air interface 44. After the auxiliary fuel is mixed with the compressed air, it is ignited by the spark plug 45 to ignite the main ignition device. At this time, the ultraviolet flame detector 48 detects the flame, and the burner 4 enters the normal operating state. Through the viewing hole 49, the flame can be seen presenting a "torch" shape and the color is blue. The fuel quantity entering the main fuel interface 42 is controlled and adjusted according to the furnace operating temperature. The fuel ratio adjustment range is 25:1. The operating temperature of the furnace, that is, the temperature of the downstream flue gas after the exhaust gas is incinerated, is set not to exceed 900 °C. Since there is no combustion-supporting air, the oxygen consumed by fuel combustion completely comes from the oxygen in the exhaust gas. Therefore, in order to ensure the full combustion of VOCs in the exhaust gas, it is necessary to ensure that the oxygen content in the exhaust gas ≥ 13%, and the optimal is ≥ 16%.

[0042] In order to ensure that when the exhaust gas passes through the flare 47 of the burner 4, the flame can burn stably and fully, that is, the flame presents a "torch" shape and the color is blue, it is necessary to ensure that the pressure drop of the exhaust gas passing through the flare 47 is between 150 Pa and 750 Pa, and it is best to maintain it between 500 Pa and 650 Pa. Generally, the operating elasticity of the exhaust gas flow rate is 50% - 100%. When the exhaust gas flow rate ratio is 2:1, that is, when the exhaust gas flow rate is 50% of the designed flow rate, it is the minimum exhaust gas flow rate acceptable for the stable operation of the burner 4. At this time, the pressure drop of the exhaust gas passing through the flare 47 of the burner 4 is designed to be 500 Pa. This pressure drop is determined by the size and quantity of the oblong holes 471 on the surface of the burner flare 47. When the exhaust gas flow rate continues to decrease and the limit drops to the exhaust gas flow rate ratio of 2.5:1, that is, 40% of the designed flow rate, at this time, if the burner 4 is to operate stably, it is necessary to ensure that the pressure drop of the burner flare 47 rises to 750 Pa. The pressure drop of the flare 47 is obtained by connecting the upstream pressure tapping pipe 8 and the downstream pressure tapping pipe 9 to the differential pressure gauge and subtracting the pressures.

[0043] In the conventional design, the exhaust gas completely passes through the flare 47 of the burner 4. In order to improve the operating elasticity of the exhaust gas flow rate, that is, to meet the pressure drop of the flare 47 during the stable operation of the burner 4, the wind deflector 6 is optimized. That is, a certain number of through holes 65 are opened on the front baffle 61 of the wind deflector 6. At this time, the exhaust gas does not completely pass through the flare 47, and part of the exhaust gas directly enters the rear end of the incinerator through the through holes 65 on the front baffle 61 of the wind deflector 6. At this time, when the exhaust gas flow rate ratio is 2:1, the pressure drop of the designed flare 47 is 500 Pa. When the exhaust gas flow rate continues to decrease, only according to the values displayed by connecting the upstream pressure tapping pipe 8 and the downstream pressure tapping pipe 9 to the differential pressure gauge, the through holes 65 on the front baffle 61 of the wind deflector 6 are blocked, and the stable operation of the burner 4 can be ensured. When the exhaust gas flow rate ratio drops to the limit of 2.5:1, the number of blocked through holes 65 is increased correspondingly to ensure that the value displayed by the differential pressure gauge is 750 Pa.

[0044] The above are only the preferred specific embodiments of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model, according to the technical solution and the inventive concept of the present utility model, makes equivalent substitutions or changes, and should be covered within the protection scope of the present utility model.

Claims

1. An incinerator without a combustion-supporting fan, comprising a furnace body (1), characterized in that: An exhaust gas inlet (2) and a flue gas outlet (3) are respectively formed on the furnace body (1). Among them, a burner (4) is further installed on the front end plate of the furnace body (1). A wind deflector (6) is fixedly connected to the inner side of the furnace body (1) through a bracket assembly (5). The wind deflector (6) is used to partition a barrier space (7) inside the furnace body (1). The exhaust gas inlet (2) and the burner (4) are both communicated with the barrier space (7).

2. The incinerator without a combustion-supporting fan according to claim 1, wherein: The wind deflector (6) includes a front baffle (61), a connecting portion (62) and a rear baffle (63). The connecting portion (62) is fixed between the front baffle (61) and the rear baffle (63). The connecting portion (62) is vertically opposite to the exhaust gas inlet (2). A connecting hole (64) is formed on the end face of the front baffle (61).

3. The incinerator without a combustion-supporting fan according to claim 2, characterized in that: A number of through holes (65) are also distributed on the end face of the front baffle (61).

4. The incinerator without a combustion-supporting fan according to claim 3, characterized in that: The opening ratio of the through holes (65) on the front baffle (61) is 5%-10%.

5. An incinerator without a combustion-supporting fan according to claim 2, characterized in that: The bracket assembly (5) includes a support rod (51) fixed in the furnace body (1). An arc-shaped plate (52) is fixedly installed on the top of the support rod (51). Among them, the arc-shaped plate (52) is in contact with and fixedly connected to the connecting portion (62).

6. The incinerator without a combustion-supporting fan according to claim 1, characterized in that: It also includes an upstream pressure tapping pipe (8) and a downstream pressure tapping pipe (9). The upstream pressure tapping pipe (8) is communicated into the barrier space (7). The downstream pressure tapping pipe (9) is communicated into the space behind the wind deflector (6) in the furnace body (1).

7. The incinerator without a combustion-supporting blower according to claim 1, characterized in that: The burner (4) includes an installation shell (41). A main fuel interface (42) and an auxiliary fuel interface (43) are communicated on the front side of the installation shell (41). A compressed air interface (44) and a spark plug (45) are communicated on one side of the auxiliary fuel interface (43). A heat insulation layer (46) and a bell mouth (47) are sequentially arranged on the rear side of the installation shell (41). A number of oblong holes (471) are formed on the surface of the bell mouth (47).

8. The incinerator without a combustion-supporting blower according to claim 7, characterized in that: An ultraviolet flame detector (48) and a fire viewing hole (49) are also installed on the front side of the installation shell (41).

9. An incinerator without a combustion-supporting fan according to any one of claims 1-8, characterized in that: The burner (4) is fixedly connected to the furnace body (1) through a fastener (10).

10. An incinerator without a combustion-supporting fan according to any one of claims 1-8, characterized in that: The furnace body (1) includes a housing (11) and a heat insulation layer (12) installed inside the housing (11).

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