Multi-class waste gas and waste liquid mixed combustion burner and use method thereof

Abstract

The application provides a multi-kind waste gas and waste liquid mixed combustion burner and a use method thereof, and relates to the field of burners.The burner comprises a premixed combustion chamber and a combustion air passage.The premixed combustion chamber comprises a top portion, an intermediate section and a bottom flange.A center lance, a first waste liquid lance and a first waste gas lance are arranged in the combustion air passage.Second waste liquid lances and second waste gas lances are arranged on the side walls of the intermediate section.The burner has a reasonable structure and is convenient and flexible to arrange.The stable combustion flame is formed by using auxiliary fuel or high-calorific-value waste gas / waste liquid, and the medium and low-calorific-value waste gas / waste liquid is simultaneously purified, so that the multi-kind waste gas / waste liquid is treated by incineration and purification.The arrangement of the multiple waste liquid lances can meet the requirements of large treatment capacity and the treatment requirements of different kinds of waste liquid.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of burners, and particularly relates to a multi-type waste gas / waste liquid mixed combustion burner and a use method thereof. BACKGROUND

[0002] In the production process of the chemical industry, various complex component waste gas / waste liquid needs to be treated, and the emission of the waste gas / waste liquid must meet or be better than the relevant national emission standard requirements. There are many treatment methods for waste gas / waste liquid, and for waste liquid / waste gas containing organic combustible components, incineration is a very effective, simple and flexible treatment method. Through incineration, the harmful components in the waste gas / waste liquid are completely oxidized into substances harmless to the environment, and at the same time, the waste heat generated by the flue gas can also be recycled according to the needs.

[0003] The waste gas / waste liquid formed by different chemical processes or products is very different, and some have very high calorific value, while some have very little combustible components. For high-calorific-value waste gas / waste liquid, it can ensure the stability of combustion and the removal of harmful substances itself, while for waste gas / waste liquid with low or low calorific value, incineration treatment needs to rely on the combustion of auxiliary fuel or high-calorific-value waste gas / waste liquid.

[0004] Invention patent CN108916875A discloses a low-nitrogen mixed combustion burner for treating waste gas / waste liquid, which is provided with a main fuel spray gun, a waste liquid spray gun and a waste gas spray pipe. A long-lasting lamp is arranged at the center, the main fuel spray gun and the waste liquid spray gun are arranged on both sides of the long-lasting lamp, and the waste gas spray pipe is arranged around. The burner can simultaneously incinerate waste gas / waste liquid fuel, and stabilize the combustion flame through the main fuel spray gun. However, it has the following defects: 1. It cannot simultaneously treat waste liquid fuel with large differences in calorific value and viscosity, and requires the waste liquid to reach a high calorific value, otherwise it is easy to cause central fire extinguishing; 2. Due to the need for atomization, the output of a single liquid spray gun cannot be too large, which greatly limits the treatment capacity of the waste liquid; 3. The waste liquid spray gun is arranged on one side of the central long-lasting lamp instead of the center, and the main fuel on the other side must always be accompanied by burning, otherwise the burner center will be burned, the outlet flame will be skewed, air distribution control will be impossible, and the main fuel will be wasted for high-calorific-value waste liquid that can be self-stable; 4. The same burner cannot simultaneously treat multiple waste gas fuels. SUMMARY

[0005] In view of the deficiencies in the prior art, the purpose of the present application is to provide a multi-type waste gas / waste liquid mixed combustion burner and a use method thereof to solve the problems raised in the background art.

[0006] In order to achieve the above-mentioned purpose, the application provides a multi-kind waste gas and waste liquid mixed combustion burner, which comprises a premix combustion chamber and a combustion air passage, the premix combustion chamber comprises a top, an intermediate section and a bottom flange, the combustion air passage is internally arranged with a center lance, a first waste liquid lance and a first waste gas lance, the center lance, the first waste liquid lance and the first waste gas lance are arranged on the top, and the intermediate section is provided with a second waste liquid lance and a second waste gas lance on the side wall.

[0007] Further, the inlet end of the combustion air passage is arranged with a wind volume adjusting device.

[0008] Further, the intermediate section is in a hollow cylindrical shape, the top is installed above the intermediate section, and the bottom flange is connected with the lower part of the intermediate section.

[0009] Further, the top is in a dome shape or a flat plate shape.

[0010] Further, the center lance is installed at the center position of the top, the center line of the center lance coincides with the center line of the premix combustion chamber, the output of the center lance is 0-10 MW, the outlet end is arranged with a first combustion stabilizing device, the center lance is provided with an independent first air supply passage, the first air supply passage inlet is provided with a first adjusting baffle for adjusting the air volume of the center lance, the first air supply passage is arranged in the combustion air passage, and an igniter is arranged at the nozzle of the center lance.

[0011] Further, a plurality of first waste liquid lances are circumferentially and uniformly arranged outside the center lance, the number of the first waste liquid lances is 3-6, the output of a single first waste liquid lance is 1-5 MW, the outlet end is arranged with a second combustion stabilizing device, the first waste liquid lance is internally provided with an atomizing device, each first waste liquid lance is provided with an independent second air supply passage, the second air supply passage inlet is provided with a second adjusting baffle for adjusting the air volume of the first waste liquid lance, and the second air supply passage is arranged in the combustion air passage.

[0012] Further, the included angle α between the center line of each circumferentially arranged first waste liquid lance and the center line of the premix combustion chamber is 5-10°.

[0013] Further, a plurality of first waste gas lances are circumferentially and uniformly arranged outside the first waste liquid lance, the number of the first waste gas lances is 3-12, the output of a single first waste gas lance is 500-1000 Nm 3 / h, the outlet end is arranged with a third combustion stabilizing device, and each first waste gas lance is provided with an independent third air supply passage, and the third air supply passage is arranged in the combustion air passage.

[0014] Further, the angle β between the center line of each of the first waste gas injection lance and the center line of the premix combustion chamber is 15-25°.

[0015] Further, the second waste liquid injection lance and the second waste gas injection lance are arranged in multiple layers in the middle section area of the premix combustion chamber, and the injection lances are arranged in 1-4 layers, and each layer is provided with 3-6 injection lances, the output of a single second waste liquid injection lance is 100-500 kg / h, and the output of a single second waste gas injection lance is 500-1000 Nm3 / h.

[0016] Further, each layer of injection lances on the middle section area of the premix combustion chamber can be arranged in three cases, one is to only provide the second waste liquid injection lance, the second is to only provide the second waste gas injection lance, and the third is to provide both the second waste liquid injection lance and the second waste gas injection lance.

[0017] Further, the second waste liquid injection lance and the second waste gas injection lance are arranged in multiple layers in the direction of the center axis of the premix combustion chamber, the second waste liquid injection lance is injected along the center of the cross section of the premix combustion chamber, and the angle γ between the center line of the second waste gas injection lance and the line connecting the center of the cross section of the premix combustion chamber and the connection point of the second waste gas injection lance (i.e. the connection point of the second waste gas injection lance and the premix combustion chamber on the center line of the second waste gas injection lance) is 0-60°.

[0018] A method for using a multi-type waste gas and waste liquid mixed combustion burner, which uses the multi-type waste gas and waste liquid mixed combustion burner, the center injection lance is used to inject auxiliary fuel, high-calorific-value waste gas or high-calorific-value waste liquid, the first waste liquid injection lance is used to inject medium-calorific-value waste liquid and / or high-calorific-value waste liquid, the first waste gas injection lance is used to inject medium-calorific-value waste gas, the second waste liquid injection lance is used to inject low-calorific-value waste liquid, and the second waste gas injection lance is used to inject low-calorific-value waste gas.

[0019] Further, for waste gas, high-calorific-value waste gas refers to waste gas with a calorific value greater than 3500 kcal / Nm 3 , low-calorific-value waste gas refers to waste gas with a calorific value less than 1500 kcal / Nm 3 , and medium-calorific-value waste gas refers to waste gas with a calorific value greater than or equal to 1500 kcal / Nm 3 and less than or equal to 3500 kcal / Nm 3 ; for waste liquid, high-calorific-value waste liquid refers to waste liquid with a calorific value greater than 6000 kcal / kg, low-calorific-value waste liquid refers to waste liquid with a calorific value less than 2500 kcal / kg, and medium-calorific-value waste liquid refers to waste liquid with a calorific value greater than or equal to 2500 kcal / kg and less than or equal to 6000 kcal / kg.

[0020] Further, when the center lance sprays liquid auxiliary fuel or high heat value waste liquid, an atomizing device is arranged in the center lance.

[0021] Further, when the first waste liquid lance sprays different kinds of waste liquid, the first waste liquid lances need to be arranged uniformly and can be put into separately and adjusted by switching for the operation load of the incinerator.

[0022] Further, each lance in the multi-kind waste gas / waste liquid mixed combustion burner can be put into use according to the actual situation, for example, when there is no medium heat value waste gas needing incineration, the first waste gas lance is closed.

[0023] Beneficial effects:

[0024] (1) Liquid fuel needs to be atomized for combustion, and the atomizing gas flow is arranged in a circumferential symmetry. Generally, the burner liquid lance is arranged in the center of the burner and is ignited and combusted after being uniformly mixed with the combustion-supporting agent. The multi-kind waste gas / waste liquid mixed combustion burner provided by the application is arranged with a plurality of first waste liquid lances around the center lance arranged in the center for spraying combustion-supporting fuel, high heat value gas or liquid, and is separately arranged with a second air supply channel and a second combustion stabilizing device for each first waste liquid lance, which can stabilize the initial combustion of each first waste liquid lance and cooperate with the center lance to achieve the functions of high efficient and stable combustion, waste liquid incineration and high temperature environment providing. The first waste gas lances for spraying medium and high heat value waste gas are also arranged with a third air supply channel and a third combustion stabilizing device. At the same time, the low heat value waste gas / waste liquid is separated by the second waste liquid lance and the second waste gas lance for later treatment, which can meet the requirements of multi-kind waste gas / waste liquid treatment and does not affect the high efficient and stable operation of the incinerator.

[0025] (2) The arrangement of the plurality of waste liquid lances can meet the requirements of large treatment capacity and different kinds of waste liquid treatment.

[0026] The concept, specific structure and technical effects of the application will be further described below with reference to the accompanying drawings, so as to fully understand the purpose, features and effects of the application. BRIEF DESCRIPTION OF DRAWINGS

[0027] Fig. 1-2 The structure schematic view of the preferred embodiment of the application.

[0028] Reference signs:

[0029] 1. Premixed combustion chamber; 1-1. Top; 1-2. Middle section; 1-3. Bottom flange; 2. Combustion air duct; 2-1. Air volume regulating device; 3. First exhaust gas spray gun; 3-1. Third combustion stabilizing device; 4. First waste liquid spray gun; 4-1. Second combustion stabilizing device; 4-2. Second regulating baffle; 5. Center spray gun; 5-1. First combustion stabilizing device; 5-2. First regulating baffle; 6. Second waste liquid spray gun; 7. Second exhaust gas spray gun; a. Combustion air duct inlet; b. Center spray gun inlet; c. First waste liquid spray gun inlet; d. First exhaust gas spray gun inlet; e. Second waste liquid spray gun inlet; f. Second exhaust gas spray gun inlet. Detailed Implementation

[0030] The present invention will be further described below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the invention, and these equivalent forms also fall within the scope defined by the appended claims.

[0031] In the accompanying drawings, components with the same structure are indicated by the same numerical designation, and components with similar structures or functions are indicated by similar numerical designations. The dimensions and thicknesses of each component shown in the drawings are arbitrary, and the present invention does not limit the dimensions and thicknesses of each component. To make the illustrations clearer, the thickness of some components has been appropriately exaggerated in the drawings.

[0032] Embodiments:

[0033] like Fig. 1-2 As shown, in a preferred embodiment, the present invention provides a multi-type waste gas and waste liquid co-firing burner, including a premixed combustion chamber 1 and a combustion air duct 2. The premixed combustion chamber 1 includes a top 1-1, a middle section 1-2 and a bottom flange 1-3. A central spray gun 5, a first waste liquid spray gun 4 and a first waste gas spray gun 3 are arranged in the combustion air duct 2. The central spray gun 5, the first waste liquid spray gun 4 and the first waste gas spray gun 3 are set on the top 1-1. A second waste liquid spray gun 6 and a second waste gas spray gun 7 are arranged on the side wall of the middle section 1-2.

[0034] An air volume regulating device 2-1 is arranged at the inlet end of the combustion air duct 2 to regulate the total air volume. The combustion air enters from the inlet a of the combustion air duct.

[0035] The middle section 1-2 is a hollow cylinder. The top 1-1 is installed above the middle section 1-2 and is dome-shaped. The bottom flange 1-3 is connected to the lower part of the middle section 1-2. The bottom flange 1-3 of the premixed combustion chamber 1 is connected to the incinerator body. The premixed combustion chamber 1 is connected to the exhaust gas / waste liquid fuel channel and the combustion air channel in the spray gun.

[0036] The center lance 5 is installed at the center of the top 1-1, fuel enters from the center lance inlet b, the center line of the center lance 5 coincides with the center line of the premixing combustion chamber 1, fuel is injected along the center axis of the premixing combustion chamber 1, the output of the center lance 5 is 0-10 MW, the first combustion stabilizing device 5-1 is arranged at the outlet end, the center lance 5 is provided with an independent first air supply channel, the first air supply channel inlet is provided with a first adjusting baffle 5-2 for adjusting the air volume of the center lance 5, the first air supply channel is arranged in the combustion air channel 2, and an igniter is arranged at the nozzle of the center lance 5.

[0037] A plurality of first waste liquid lances 4 are arranged circumferentially outside the center lance 5, the number of the first waste liquid lances 4 is 6, according to the waste liquid treatment capacity, the output of a single first waste liquid lance 4 is 1-5 MW, the second combustion stabilizing device 4-1 is arranged at the outlet end, and stable combustion is maintained through the heat of the center lance 5 or the first waste liquid lance 4, in order to ensure efficient and stable combustion, the first waste liquid lance 4 is provided with an atomizing device, the waste liquid is atomized by a medium, the medium is steam or compressed air, and according to the need of medium atomization, the viscosity of the waste liquid is controlled by heating to meet the requirements, the waste liquid fuel and the medium enter from the first waste liquid lance inlet c, and each first waste liquid lance 4 is provided with an independent second air supply channel, the second air supply channel inlet is provided with a second adjusting baffle 4-2 for adjusting the air volume of the first waste liquid lance 4, and the second air supply channel is arranged in the combustion air channel 2.

[0038] The included angle α between the center line of each circumferentially arranged first waste liquid lance 4 and the center line of the premixing combustion chamber 1 is 5-10°, and the setting of the included angle is conducive to the concentrated injection of the waste liquid and the full use of the center auxiliary fuel for combustion.

[0039] Further, a plurality of first waste gas lances 3 are arranged circumferentially outside the first waste liquid lance 4, waste gas fuel enters from the first waste gas lance inlet d, the number of the first waste gas lances 3 is 6, the output of a single first waste gas lance 3 is 500-1000 Nm 3 / h, the third combustion stabilizing device 3-1 is arranged at the outlet end to stabilize waste gas combustion, and each first waste gas lance 3 is provided with an independent third air supply channel, and the third air supply channel is arranged in the combustion air channel 2.

[0040] The included angle β between the center line of each circumferentially arranged first waste gas lance 3 and the center line of the premixing combustion chamber 1 is 15-25°, and the setting of the included angle is conducive to the full mixing and heating combustion of the waste gas and the flue gas of the waste liquid, and at the same time, the waste liquid is wrapped in the center to avoid the atomized waste liquid particles from being sprayed to the premixing combustion chamber wall of the burner and being difficult to burn out.

[0041] The second waste liquid lance 6 and the second waste gas lance 7 are arranged in multiple layers in the middle section 1-2 area of the premix combustion chamber 1, and the lances are arranged in two layers, four lances in each layer. The waste liquid enters through the second waste liquid lance inlet e, and the waste gas enters through the second waste gas lance inlet f. The output of a single second waste liquid lance 6 is 100-500 kg / h, and the output of a single second waste gas lance 7 is 500-1000 Nm 3 / h.

[0042] The output of the lance represents the capacity of waste gas / waste liquid treatment. The same power, if the calorific value is different, the unit hourly volume flow is not the same.

[0043] In this embodiment, the lances on the middle section 1-2 area of the premix combustion chamber 1 are arranged in two layers, four second waste liquid lances 6 are uniformly arranged in the upper layer, and four second waste gas lances 7 are uniformly arranged in the lower layer.

[0044] The second waste liquid lance 6 and the second waste gas lance 7 are arranged in multiple layers horizontally along the central axis direction of the premix combustion chamber 1, which makes it more difficult for the waste liquid to burn and vaporize. At the same time, to avoid the waste liquid being sprayed onto the furnace wall, the second waste liquid lance 6 is sprayed along the cross-sectional center of the premix combustion chamber 1, and on the cross section at the connection between the second waste gas lance 7 and the premix combustion chamber 1, the included angle γ between the center line of the second waste gas lance 7 and the line connecting the center of the cross section of the premix combustion chamber 1 and the connection between the second waste gas lance 7 and the premix combustion chamber 1 (the connection of the second waste gas lance 7 is on the center line of the second waste gas lance 7) is 0-60°.

[0045] The nozzle of a single layer of second waste gas lances 7 forms a tangent circle in the circumferential cross section, which can promote rapid and uniform mixing with the upstream airflow. The amount of fuel and combustion air input meets the requirements of waste gas / waste liquid treatment incineration flue gas temperature.

[0046] A method for using a multi-type waste gas / waste liquid mixed combustion burner, which uses the above-mentioned multi-type waste gas / waste liquid mixed combustion burner. The center lance 5 sprays auxiliary fuel, high-calorific value waste gas or high-calorific value waste liquid, the first waste liquid lance 4 sprays medium-calorific value waste liquid and / or high-calorific value waste liquid, the first waste gas lance 3 sprays medium-calorific value waste gas, the second waste liquid lance 6 sprays low-calorific value waste liquid, and the second waste gas lance 7 sprays low-calorific value waste gas.

[0047] From the perspective of waste gas treatment, the calorific value of general waste gas is not too high, otherwise it would not be treated as waste gas. In addition, if high-calorific value waste gas needs to be treated, it can be placed in the center lance 5 as a combustion-supporting fuel.

[0048] The auxiliary fuel is a high-calorific value fuel, such as fuel oil, natural gas, etc. When auxiliary fuel is not needed for combustion support, the center lance 5 sprays high-calorific value waste gas or high-calorific value waste liquid, with the purpose of forming a stable combustion flame. The output is input according to the situation of other waste gas / waste liquid. The treatment of waste gas / waste liquid generally tries to save the need for high-calorific value fuel.

[0049] The central lance 5 is mainly used for the baking, ignition and stable combustion of the incinerator. The power of the central lance 5 is calculated according to the heat value of the waste gas and waste liquid and the incineration capacity, so as to meet the requirements of the incineration flue gas temperature and the waste heat utilization of the incinerator.

[0050] The waste liquid sprayed by the second waste liquid lance 6 and the waste gas sprayed by the second waste gas lance 7 have low heat value, and mainly consider the full and uniform mixing with the high-temperature flue gas, so as to meet the requirements of the treatment of a small amount of organic matter in the waste gas / waste liquid and the evaporation and heat absorption vaporization of the waste liquid. Therefore, a separate air duct and other devices are not required.

[0051] For waste gas, high heat value waste gas refers to waste gas with a heat value greater than 3500kcal / Nm 3 , low heat value waste gas refers to waste gas with a heat value less than 1500kcal / Nm 3 , and medium heat value waste gas refers to waste gas with a heat value greater than or equal to 1500kcal / Nm 3 and less than or equal to 3500kcal / Nm 3 ; for waste liquid, high heat value waste liquid refers to waste liquid with a heat value greater than 6000kcal / kg, low heat value waste liquid refers to waste liquid with a heat value less than 2500kcal / kg, and medium heat value waste liquid refers to waste liquid with a heat value greater than or equal to 2500kcal / kg and less than or equal to 6000kcal / kg.

[0052] When liquid auxiliary fuel or high heat value waste liquid is sprayed in the central lance 5, an atomizing device is arranged in the central lance 5.

[0053] An atomizing device is arranged in the second waste liquid lance 6. Low heat value waste liquid generally has low viscosity, and low pressure air atomization or mechanical atomization is adopted, and is sprayed along the high temperature area in the center of the premixed combustion chamber cross section.

[0054] When the types of waste liquid sprayed in the first waste liquid lance 4 are different, the first waste liquid lance 4 spraying the same type of waste liquid needs to be uniformly arranged, and can be independently put into and adjusted by switching for the operation load of the incinerator. That is, when six first waste liquid lances 4 are arranged, and the waste liquid is two different types of waste liquid, one type of waste liquid can be sprayed through three first waste liquid lances 4, and the two types of waste liquid are arranged at intervals. No matter which type of waste liquid is put in, the circumferential direction of each type of waste liquid is uniform.

[0055] The multi-type waste gas and waste liquid mixed combustion burner has reasonable structure, convenient and flexible arrangement, utilizes auxiliary fuel or high heat value waste gas / waste liquid to form stable combustion flame, and simultaneously purifies medium and low heat value waste gas / waste liquid, so that the purpose of simultaneously treating multi-type waste gas / waste liquid through incineration and purification can be achieved. In order to simultaneously meet the requirements of treating multi-type waste gas / waste liquid and large treatment capacity, according to the characteristics of waste gas / waste liquid, the combustion-supporting fuel is reasonably utilized, so that the medium and high heat value waste gas / waste liquid can maintain the reasonable temperature of the incinerator, and the treatment of low heat value waste gas / waste liquid will not affect the stable combustion of the burner.

[0056] It should be noted that the drawings and structure description of the multi-type waste gas and waste liquid mixed combustion burner in the application are directed to the vertical incinerator. When the incinerator is horizontal, the multi-type waste gas and waste liquid mixed combustion burner only needs to be rotated and placed, and is connected with the incinerator body through the bottom flange.

Claims

1. A multi-class waste gas and liquid mixed combustion burner, characterized in that, The application relates to a premix combustion chamber (1) and a combustion air channel (2), the premix combustion chamber (1) comprising a top (1-1), an intermediate section (1-2) and a bottom flange (1-3), the combustion air channel (2) being provided with a central lance (5), a first waste liquid lance (4) and a first waste gas lance (3), the central lance (5), the first waste liquid lance (4) and the first waste gas lance (3) being arranged on the top (1-1), the intermediate section (1-2) being provided with a second waste liquid lance (6) and a second waste gas lance (7) on the side wall, the intermediate section (1-2) being in the shape of a hollow cylinder, the top (1-1) being arranged above the intermediate section (1-2), the bottom flange (1-3) being connected to the lower part of the intermediate section (1-2), the central lance (5) being arranged at the central position of the top (1-1), the central line of the central lance (5) being coincident with the central line of the premix combustion chamber (1), the output of the central lance (5) being 0-10 MW, the first combustion stabilizing device (5-1) being arranged at the outlet end of the central lance (5), the central lance (5) being provided with an independent first air supply channel, the first air supply channel being provided with the first adjusting baffle (5-2) for adjusting the air volume of the central lance (5), the first air supply channel being arranged in the combustion air channel (2), the central lance (5) being provided with an igniter at the nozzle, a plurality of the first waste liquid lances (4) being arranged in the periphery of the central lance (5) in a uniform manner in the circumferential direction, the number of the first waste liquid lances (4) being 3-6, the output of a single first waste liquid lance (4) being 1-5 MW, the second combustion stabilizing device (4-1) being arranged at the outlet end of the first waste liquid lance (4), the first waste liquid lance (4) being provided with an atomizing device, each first waste liquid lance (4) being provided with an independent second air supply channel, the second air supply channel being provided with the second adjusting baffle (4-2) for adjusting the air volume of the first waste liquid lance (4), the second air supply channel being arranged in the combustion air channel (2), a plurality of the first waste gas lances (3) being arranged in the periphery of the first waste liquid lance (4) in a uniform manner in the circumferential direction, the number of the first waste gas lances (3) being 3-12, the output of a single first waste gas lance (3) being 500-1000 Nm 3 / h, the third combustion stabilizing device (3-1) being arranged at the outlet end of the first waste gas lance (3), each first waste gas lance (3) being provided with an independent third air supply channel, the third air supply channel being arranged in the combustion air channel (2), the second waste liquid lance (6) and the second waste gas lance (7) being arranged in multiple layers in the horizontal direction along the central axis of the premix combustion chamber (1), the second waste liquid lance (6) being injected along the center of the cross section of the premix combustion chamber (1), the central line of the second waste gas lance (7) and the included angle gamma between the central line of the second waste gas lance (7) and the connecting line between the connection position of the second waste gas lance (7) and the cross section of the premix combustion chamber (1) being 0-60 DEG.

2. The multi-class waste gas / liquid mixed combustion burner of claim 1, wherein The inlet end of the combustion air passage (2) is provided with an air volume adjusting device (2-1).

3. The multi-class waste gas / liquid mixed combustion burner of claim 1, wherein The included angle α between the center line of each of the circumferentially arranged first waste liquid injection guns (4) and the center line of the premixing combustion chamber (1) is 5-10°.

4. The multi-class waste gas / liquid mixed combustion burner of claim 1, wherein The included angle β between the center line of each of the circumferentially arranged first waste gas injection guns (3) and the center line of the premixing combustion chamber (1) is 15-25°.

5. The multi-class waste gas / liquid mixed combustion burner of claim 1, wherein The second waste liquid lance (6) and the second waste gas lance (7) are arranged in multiple layers in the middle section (1-2) area of the premix combustion chamber (1), the output of a single second waste liquid lance (6) is 100-500 kg / h, and the output of a single second waste gas lance (7) is 500-1000 Nm 3 / h.

6. A method of using a multi-class waste gas and liquid mixed combustion burner, characterized in that, The multi-type waste gas and waste liquid mixed combustion burner according to any one of claims 1-5, wherein the center injection gun (5) is used for injecting auxiliary fuel, high-calorific value waste gas or high-calorific value waste liquid, the first waste liquid injection gun (4) is used for injecting medium-calorific value waste liquid and / or high-calorific value waste liquid, the first waste gas injection gun (3) is used for injecting medium-calorific value waste gas, the second waste liquid injection gun (6) is used for injecting low-calorific value waste liquid, and the second waste gas injection gun (7) is used for injecting low-calorific value waste gas.

7. The method of using a multi-class waste gas / liquid mixed combustion burner of claim 6, wherein, For waste gas, high-calorific-value waste gas refers to waste gas with a calorific value greater than 3500 kcal / Nm 3 For waste gas, low-calorific-value waste gas refers to waste gas with a calorific value less than 1500 kcal / Nm 3 For waste gas, medium-calorific-value waste gas refers to waste gas with a calorific value greater than or equal to 1500 kcal / Nm 3 and less than or equal to 3500 kcal / Nm 3 For waste liquid, high-calorific-value waste liquid refers to waste liquid with a calorific value greater than 6000 kcal / kg, low-calorific-value waste liquid refers to waste liquid with a calorific value less than 2500 kcal / kg, and medium-calorific-value waste liquid refers to waste liquid with a calorific value greater than or equal to 2500 kcal / kg and less than or equal to 6000 kcal / kg.

8. The method of using a multi-class waste gas / liquid mixed combustion burner of claim 7, wherein, When liquid auxiliary fuel or high-calorific value waste liquid is injected in the center injection gun (5), an atomizing device is arranged in the center injection gun (5).

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