A rotatable gas-liquid two-phase atomizing burner

Abstract

The application discloses a rotatable gas-liquid two-phase atomizing burner applied to an ethylene cracking furnace, relates to two parts of a gas-liquid two-phase atomizing burner and a rotating adjusting mechanism of the ethylene cracking furnace. The burner comprises an ultrasonic generator, an energy exchanger, a vibrator, a fuel oil channel, a first air channel, a second air channel, a fuel gas channel, a premixing chamber and a mixing chamber. The ultrasonic generator is used for atomizing fuel oil; after being atomized, the fuel oil is mixed with air in the premixing chamber; air and fuel gas channels are arranged on the two sides of the premixing chamber; the fuel oil, the air and the fuel gas are mixed and sprayed out; and the rotating adjusting mechanism can flexibly adjust the flame direction. The burner can burn the fuel oil and the fuel gas at the same time, solves the problem of insufficient cracking ethane fuel gas of the ethylene device, sprays out the fuel oil after ultrasonic atomization, is provided with a two-stage air premixing structure, can sufficiently increase the contact area of the fuel oil and the air, and effectively improves the combustion efficiency of the fuel oil and the fuel gas.

Description

TECHNICAL FIELD

[0001] The present application relates to an ethylene cracking furnace burner, in particular to a rotatable gas-liquid two-phase atomizing burner. BACKGROUND

[0002] The ethylene cracking furnace refers to the equipment used for cracking light hydrocarbons or naphtha to generate ethylene products. The heat required by the ethylene cracking furnace is supplied by the burner. The common fuels for the burner are fuel gas or fuel oil. As a key equipment of the ethylene device, the cracking furnace is not only a major consumer of energy, but also a main source of economic benefits of the overall device, accounting for about 80% of the total energy consumption. When the raw material of the ethylene device is ethane, the fuel gas cannot meet the combustion demand, and the fuel needs to be supplemented. With the continuous rise in the price of fuel gas such as propane, the low-value carbon nine product produced by the ethylene device has a high heat value and is a good fuel oil. Making full use of the low-value fuel oil produced by the ethylene device to replace propane as fuel can improve the efficiency of the ethylene device. In the actual production process, due to the uneven mixing effect of the fuel oil / fuel gas and air sprayed from the burner nozzles in the furnace, the fuel oil / fuel gas is not completely combusted, which leads to a large temperature difference of the cracking gas outlet temperature (COT) of each reaction tube in the radiation section, causing uneven cracking depth and low heat transfer efficiency of each reaction tube, resulting in large fuel consumption and short operation cycle of the cracking furnace.

[0003] To solve the problem of uneven heat transfer in the furnace and meet the environmental protection requirements of low-NOx burners, the existing patent (publication number: CN205328948U) discloses an ethylene cracking furnace burner and its arrangement structure, which relates to an ethylene cracking furnace burner and its arrangement structure. The bottom burner is arranged at the bottom of the cracking furnace, and the side wall burner is arranged in the middle of the side wall of the cracking furnace and is single-row. The flames of the bottom burner and the side wall burner are vertically upward. The inventor found that the following problems in the prior art have not been well solved in the process of implementing the scheme: the flame of the burner in the arrangement structure does not have an adjusting function, the shape of the flame is not convenient to adjust, the adjusting speed is slow, the flame is complex, and the temperature distribution is uneven during the adjustment process; at the same time, the arrangement mode does not involve enhancing the contact area of the fuel oil and air, improving the combustion efficiency of the fuel oil, and reducing the energy consumption of the device.

[0004] Therefore, with the large-scale development of the cracking furnace and the emphasis on environmental protection, it is necessary to develop a new type of burner to improve the fuel flexibility and benefits of the ethylene device, effectively solve the problem of uneven cracking depth of the cracking raw material in each furnace tube in the cracking furnace, uneven heat in the furnace, and low heat efficiency of the fuel oil, and reduce the overall energy consumption and maintenance cost of the ethylene device. SUMMARY

[0005] The main purpose of the present application is to solve the problems in the background art, and to provide a rotatable gas-liquid two-phase atomizing burner.

[0006] To achieve the above-mentioned purpose, the technical scheme adopted by the present application is:

[0007] A rotatable gas-liquid two-phase atomizing burner, comprising a gas-liquid two-phase atomizing burner and a rotation adjusting mechanism, the gas-liquid two-phase atomizing burner is arranged at the bottom or side wall of an ethylene cracking furnace, comprising an ultrasonic generator, an energy exchanger, a vibrator, a fuel oil channel, a first air channel, a second air channel, a fuel gas channel, a premixing chamber, a mixing chamber, and a flame jet nozzle; the rotation adjusting mechanism comprises a first pipe, a pipe rotary joint, a gear, a second pipe, and a bearing.

[0008] Further, the burner ultrasonic generator is connected to the vibrator of the burner through the energy exchanger, the vibrator is inserted into the premixing chamber, the burner is provided with a fuel oil channel, a first air channel, a second air channel, and a fuel gas channel, fuel oil enters the rear end of the vibrator from the fuel oil channel and is sprayed from the front end of the vibrator, the lower side of the vibrator is the first air channel, the atomized fuel oil is mixed with air in the first air channel in the premixing chamber, the upper side of the premixing chamber is provided with the second air channel, and the lower side is provided with the fuel gas channel, the premixing chamber, the second air channel, and the fuel gas channel are mixed, and the mixture is sprayed through the mixing chamber and the flame jet nozzle.

[0009] Further, the gas-liquid two-phase atomizing burner comprises a first pipe, a pipe rotary joint, a gear, a second pipe, and a bearing, the bearing is embedded and installed in the furnace wall of the cracking furnace, the second pipe is rotatably installed in the inside of the bearing, one end of the second pipe is fixedly connected with a direct pipe inside the furnace wall, and the top end of the curved pipe is fixedly installed with a side flame jet nozzle.

[0010] Further, the vibrator is provided with a long hole in the center, the vibration amplitude of the rear end of the vibrator is small, the vibration amplitude of the front end of the vibrator is large, and the fuel oil is atomized during the flow.

[0011] Further, the horizontal adjustment angle of the rotation adjusting mechanism is 0-180°.

[0012] Preferably, the ultrasonic generator is externally connected with a plurality of energy exchangers and vibrators, the energy exchangers and vibrators correspond to the burners one by one, are arranged beside the flame nozzles of the cracking furnace, and a plurality of flame nozzles share one ultrasonic generator.

[0013] Further, the outer surface of the second pipe is fixedly sleeved with a gear outside the furnace wall.

[0014] Compared with the prior art, the present application has the following beneficial effects:

[0015] Compared with the prior art, the present application has the following beneficial effects:(1) Through the gas-liquid two-phase atomizing burner, the cracking furnace fuel type can be flexibly selected, the cracking furnace fuel composition can be optimized in real time according to the product price changes of fuel gas, propane, cracking gasoline and cracking carbon nine, the ethylene device income is improved, and the problem that the by-product fuel gas of the ethylene cracking device taking ethane as the raw material is insufficient to supply the cracking furnace combustion demand can be effectively solved. The income of the present application is explained by taking a set of ethane as the raw material and an annual output of 1 million tons of ethylene device as an example. The 100 million tons / year ethylene device consumes fuel gas 330,000 tons / year, and itself by-product fuel gas 150,000 tons / year, and needs to supplement propane 190,000 tons / year. If 10% of the heat is provided by by-product cracking carbon nine, 20,000 tons / year of cracking carbon nine needs to be burned. According to the price of 5950 yuan / ton of propane and 4800 yuan / ton of cracking carbon nine, a single set of ethylene device can realize the benefit of 17.05 million yuan / year.

[0016] (2) The fuel oil is atomized by ultrasonic waves, and two air mixing cavities are arranged, the contact area of the fuel oil and air can be increased, the fuel oil combustion efficiency or heat utilization rate can be increased by 0.6%, the problems of insufficient combustion and fire nozzle carbon deposition can be avoided, the heating of each furnace tube in the cracking furnace chamber is uniform, the cracking depth of the cracking raw material is more balanced, the operation cycle of the cracking furnace is improved by 5-10 days, and other effective effects are: the exhaust smoke temperature is reduced by 5-10℃, and the absolute pressure ratio increases by 8%.

[0017] (3) The flame direction can be adjusted by connecting a power source to drive a plurality of gears to rotate accurately, and the actual operation of the single furnace tube of the cracking furnace is combined, including the surface temperature of the furnace tube, the absolute pressure ratio and other key indicators, and the transmission device is adjusted specifically, so that the cracking depth is improved, the raw material utilization rate is improved (the ethylene unit consumption is reduced by 0.15-0.78%), and the overall economic benefit of the device is improved. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 A flow diagram of an ethylene cracking furnace of a rotatable gas-liquid two-phase atomizing burner is provided, wherein the burner of the application is located in the radiation section (red box in the figure);

[0019] Figure 2 A partial structure schematic diagram of a rotatable gas-liquid two-phase atomizing burner is provided;

[0020] Figure 3 A top view structure schematic diagram of a rotatable gas-liquid two-phase atomizing burner is provided;

[0021] Figure 4 A perspective structure schematic diagram of a rotatable gas-liquid two-phase atomizing burner is provided;

[0022] Figure 5 A cross-sectional structure schematic diagram of a rotatable gas-liquid two-phase atomizing burner is provided.

[0023] Figure: 1, gas-liquid two-phase atomized burner; 2, rotating adjustment mechanism; 10, ultrasonic generator; 11, energy exchanger; 12, vibrator; 13, fuel oil channel; 14, first air channel; 15, second air channel; 16, fuel gas channel; 17, pre-mixing chamber; 18, mixing chamber; 19, flame jet nozzle; 21, first pipe; 22, pipe rotary joint; 23, gear; 24, second pipe; 25, bearing; 26, curved pipe; DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the accompanying drawings of the embodiments of the present application. Figure 3 , accompanying drawings Figure 4 and accompanying drawings Figure 5 , the technical solutions in the embodiments of the present application will be described clearly and completely below,

[0025] The present application will be further described below with reference to the specific embodiments.

[0026] A rotatable gas-liquid two-phase atomized burner, comprising a gas-liquid two-phase atomized burner (1) and a rotating adjustment mechanism (2), as shown in Figure, the side wall of an ethylene cracking furnace is provided with a plurality of rotatable gas-liquid two-phase atomized burners, and a plurality of rotatable gas-liquid two-phase atomized burners are embedded on the bottom of the cracking furnace.

[0027] In the embodiment, the atomized burner structure 1 comprises an ultrasonic generator 10 which is arranged outside the cracking furnace independently of the burner, the ultrasonic generator is connected with a vibrator 12 of the burner through an energy exchanger 11, the vibrator 12 is inserted into the burner, the burner is provided with a fuel oil channel 13, a first air channel 14, a second air channel 15, and a fuel gas channel 16, fuel oil enters the rear end of the vibrator after passing through the fuel oil channel 13 and is sprayed out from the front end of the vibrator 11, the lower side of the vibrator 11 is the first air channel 14, the atomized fuel oil is mixed with air in the first air channel 14 in a pre-mixing chamber 17, the pre-mixing chamber 17 is provided with the second air channel 15 on one side and the fuel gas channel 16 on the other side, air and fuel gas enter through the channels, a mixing chamber 18 is arranged outside the pre-mixing chamber, and the atomized fuel oil, air and fuel gas are mixed and sprayed out from a flame jet nozzle 19. The rotating adjustment mechanism comprises a first pipe 21, a pipe rotary joint 22, a gear 23, a second pipe 24 and a bearing 25, the bearing 25 is embedded and arranged in the furnace wall of the cracking furnace, the second pipe 24 is rotatably arranged in the bearing 25, a curved pipe 26 is fixedly connected to one end of the second pipe 24 which is located in the interior of the furnace wall, the burner 1 is fixedly arranged at the top end of the curved pipe 26, the pipe rotary joint 22 is fixedly arranged at one end of the second pipe 24 which is away from the bearing 25, the first pipe 21 is fixedly connected to one end of the pipe rotary joint 22 which is away from the second pipe 24, and the gear 23 is fixedly sleeved on the outer surface of the second pipe 24 which is located outside the furnace wall.

[0028] Specifically, fuel oil enters the burner and contacts the vibrator 12, at this time the vibrator 12 has a low frequency, under the action of surface tension and affinity, the fuel oil forms a thin film, and then flows to the front end of the nozzle, where the vibrator 12 has a high vibration frequency, the fuel oil is atomized and mixed with air for the first time, and after mixing, the atomized fuel oil is mixed with air and fuel again in the mixing chamber 19, and then sprayed out through the flame nozzle 19; at the same time, a number of gears 23 driven by an external power source can be precisely rotated to adjust the direction of the flame, meet the needs of different flame lengths and directions, and through the setting of the pipeline rotary joint 22, simple rotation can be realized, and the gear 23 is convenient for external power source control rotation. Through the rotatable gas-liquid two-phase atomizing burner, the proportion of fuel oil and fuel gas can be flexibly adjusted, the contact area of fuel oil or fuel gas and air is increased, the combustion efficiency is improved, insufficient combustion is avoided, and environmental pollution is reduced.

[0029] Working principle: in the present application, the first pipeline 21 and the lower flame nozzle 4 are externally connected with the flame spraying ends of a plurality of burners, and a plurality of gears 23 are respectively externally connected with a power source, which can drive the gears 23 to rotate accurately, which is prior art; through the external connection of an ultrasonic generator and an energy exchanger, the contact area of fuel oil and air is increased, which is mature technology; through the setting of a plurality of built-in channels and mixing chambers, the contact area of fuel oil and air is further increased.

[0030] The circuit, electronic components and control module involved are prior art, and those skilled in the art can realize them without further description, and the content protected by the present application does not involve improvement of software and methods.

[0031] The above shows and describes the basic principles and main features of the present application and the advantages of the present application. Those skilled in the art should understand that the present application is not limited to the above embodiments, and the above embodiments and descriptions in the specification are only to illustrate the principles of the present application, and various changes and improvements can be made without departing from the spirit and scope of the present application, and these changes and improvements all fall within the scope of the present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. An ethylene cracking furnace rotatable gas-liquid two-phase atomizing burner, characterized in that, It comprises: The gas-liquid two-phase atomizing burner (1) and the rotating adjusting mechanism (2), the gas-liquid two-phase atomizing burner is arranged at the bottom or side wall of the ethylene cracking furnace, the gas-liquid two-phase atomizing burner comprises an ultrasonic generator (10), an energy exchanger (11), a vibrator (12), a fuel oil channel (13), a first air channel (14), a second air channel (15), a fuel gas channel (16), a premixing chamber (17), a mixing chamber (18), a flame spraying nozzle (19), the ultrasonic generator (10) is arranged outside the cracking furnace independently of the burner, the ultrasonic generator (10) is connected with the vibrator (12) of the burner through the energy exchanger (11), the vibrator (12) is inserted into the burner, the burner is provided with the fuel oil channel (13), the first air channel (14), the second air channel (15) and the fuel gas channel (16), the fuel oil enters the rear end of the vibrator (12) from the fuel oil channel (13) and is sprayed from the front end of the vibrator (12), one side of the vibrator (12) is the first air channel (14), the atomized fuel oil is mixed with the air in the first air channel (14) in the premixing chamber (17), one side of the premixing chamber (17) is provided with the second air channel (15), the other side is provided with the fuel gas channel (16), and the front end of the premixing chamber (17) is connected with the mixing chamber (18), the mixed fuel oil, the second air channel air and the fuel gas channel fuel gas in the premixing chamber (17) are mixed in the mixing chamber (18) and sprayed from the flame spraying nozzle (19); the rotating adjusting mechanism (2) comprises a first pipe (21), a pipe rotating joint (22), a gear (23), a second pipe (24) and a bearing (25), the bearing (25) is embedded and installed in the furnace wall, the second pipe (24) is rotatably installed in the bearing (25), one end of the second pipe (24) is fixedly connected with a curved pipe (26) in the inside of the cracking furnace wall, and the top end of the curved pipe (26) is connected with the gas-liquid two-phase atomizing burner (1).

2. The rotatable gas-liquid two-phase atomizing burner for ethylene cracking furnace according to claim 1, characterized in that: The vibrator (12) is provided with a long hole in the center, the vibration amplitude of the rear end of the vibrator (12) is smaller than that of the front end, and the fuel oil is atomized during flow.

3. The rotatable gas-liquid two-phase atomizing burner for ethylene cracking furnace according to claim 1, characterized in that: The horizontal adjusting angle of the rotating adjusting mechanism (2) is 0-180°.

4. The rotatable gas-liquid two-phase atomizing burner for ethylene cracking furnace according to claim 1, characterized in that: The ultrasonic generator (10) is connected with a plurality of energy exchangers (11) and vibrators (12).

Images