CN216431709U

CN216431709U - Circular flame ultralow NO for ethylene and styrene deviceXBurner with a burner head

Info

Publication number: CN216431709U
Application number: CN202120927134.3U
Authority: CN
Inventors: 杜俊; 谷小丰
Original assignee: Shandong Shengyuan Petrochemical Technology Co ltd; Changsha Xinzhong Petrochemical Equipment Co ltd
Current assignee: Changsha Xinzhong Petrochemical Equipment Co ltd
Priority date: 2021-04-30
Filing date: 2021-04-30
Publication date: 2022-05-03
Anticipated expiration: 2031-04-30

Abstract

Circular flame ultralow NO for ethylene and styrene device_XBurner belongs to heating furnace burner technical field. The upper part of the burner main body is provided with a primary combustion area (18) and a secondary combustion area (17) from bottom to top in sequence, and the inside of the burner main body is provided with a primary combustion area (18) and a secondary combustion area (17)The upper end of gas pipe (16) and outer gas pipe (1) all is provided with the nozzle, and in the upper end of interior gas pipe (16) extended primary combustion district (18), the upper end of outer gas pipe (1) set up in secondary combustion district (17) one side to spout gas to secondary combustion district (17), tail gas pipe (4) set up between primary combustion district (18) and secondary combustion district (17), and the upper end of tail gas pipe (4) is provided with the nozzle, and spouts tail gas to secondary combustion district (17). The utility model uses inner gas pipe and outer gas pipe to inject gas in stages, the tail gas pipe sends the tail gas after burning in the primary burning area to the secondary burning area, and uses burning stage and smoke reflux technique to restrain NO_XIs generated.

Description

Circular flame ultralow NO for ethylene and styrene deviceXBurner with a burner head

Technical Field

Circular flame ultralow NO for ethylene and styrene device_XBurner belongs to heating furnace burner technical field.

Background

The burner is a general name of a device which sprays and mixes (or sprays and mixes) fuel and air in a certain mode for combustion, and an industrial burner is commonly called a burner, has various types and specifications, and has several categories of fuel oil, gas (coal gas) and coal (coal powder/coal water slurry). The application fields are wide, and the combustor is required in industrial occasions where fuel needs to be combusted to heat materials or react.

The burner for ethylene or styrene apparatus is to spray fuel gas into combustion zone and burn in the combustion zone, but the national requirements for environmental protection are becoming stricter and NO is required_XEmission of less than or equal to 100mg/m³NO of existing burners_XThe emission amount of the catalyst is seriously beyond the standard and is difficult to meet the national environmental protection requirement.

Disclosure of Invention

The technical problem to be solved by the utility model is as follows: overcomes the defects of the prior art, and provides a method for injecting fuel in two stages to inhibit NO_XTo meet the national environmental protection requirements, the circular flame for ethylene and styrene devices has ultralow NO_XA burner.

The technical scheme adopted by the utility model for solving the technical problems is as follows: the ethylene and styrene device uses a circular flame with ultra-low NO_XA burner, characterized by: the burner comprises a burner body, an internal combustion air pipe, an external combustion air pipe and a tail gas pipe, wherein the bottom of the burner body is connected with an air regulating valve, a primary combustion area and a secondary combustion area are sequentially arranged on the upper part of the burner body from bottom to top, and internal combustion is carried outThe upper end of trachea and outer gas pipe all is provided with the nozzle, and in inner gas pipe's upper end extended primary combustion district, outer gas pipe's upper end set up in secondary combustion district one side to with gas injection to secondary combustion district, the tail gas pipe sets up between primary combustion district and secondary combustion district, and tail gas pipe's upper end is provided with the nozzle, and with tail gas injection to secondary combustion district.

Preferably, the inner gas pipe is provided with a plurality of inner gas pipes at intervals around the burner body.

Preferably, the outer gas pipes are arranged around the burner body at intervals, and a tail gas pipe is arranged between every two adjacent outer gas pipes. And a tail gas pipe is arranged between every two adjacent outer gas pipes, so that the tail gas and the gas can be fully mixed.

Preferably, the top of the burner main body is provided with an opening, the opening corresponds to the outer gas pipe one by one and is opposite to the burner of the corresponding outer gas pipe. The openings correspond to the outer gas pipes one by one, and gas can be fully sprayed into the secondary combustion area.

Preferably, an injection device for pressurizing the tail gas is arranged between the primary combustion area and the tail gas pipe.

Preferably, injection apparatus include jet pump, booster pump and stop valve, the input port and the outer gas pipe intercommunication of booster pump, behind the delivery outlet series connection stop valve of booster pump with the high-pressure medium entry intercommunication of jet pump, the low pressure medium entry of jet pump passes through the intake pipe and communicates with the bottom in primary combustion district, the delivery outlet and the tail gas pipe intercommunication of jet pump. The booster pump boosts the fuel, and then the jet pump enters the tail gas pipe, so that the jet pump extracts the smoke of the primary combustion area and sends the smoke into the tail gas pipe, thereby not only realizing the injection of the smoke, but also avoiding introducing oxygen into the tail gas.

Preferably, the air regulating valve include valve body, valve plate and pivot, the valve body is the open tube-shape in both ends, the rotatable installation of pivot is in the valve body, the valve plate sets up in the valve body, the valve plate links to each other with the pivot to along with the rotation of pivot and synchronous oscillation, the pivot is connected with controlling means.

Preferably, the valve plate include initiative valve plate and passive valve plate, the pivot overcoat is equipped with the sleeve pipe, be provided with the slot hole on the sleeve pipe, and the slot hole encircles the sleeve pipe setting, the tip of initiative valve plate links to each other with the pivot after passing the slot hole, passive valve plate links to each other with the sleeve pipe, is provided with the spacing limiting plate to the sleeve pipe on the valve body, be provided with on the sleeve pipe with limiting plate complex backup pad, the backup pad is just to setting up with passive valve plate, be provided with the torsional spring between passive valve plate and the initiative valve plate, the torsional spring promotes the direction swing of passive valve plate to the initiative valve plate. The rotating shaft is rotated, the driving valve plate synchronously swings along with the rotation of the rotating shaft to adjust the ventilation volume of one side of the valve body, the other side of the valve body is always sealed by the driven valve plate due to the existence of the torsion spring, the rotating shaft continues to rotate until the driving valve plate is attached to the driven valve plate, and the driven valve plate can be synchronously opened along with the driving valve plate at the moment, so that the ventilation volume of the whole cavity of the valve body can be adjusted, the sectional adjustment of the air intake is realized, and the use is convenient.

Preferably, the operating device comprises a worm wheel and a worm, the worm is connected with the rotating shaft and meshed with the worm, and the worm wheel is provided with a crank. The worm gear mechanism has the characteristic of reverse self-locking, and can ensure that the valve plate maintains a stable position after adjustment.

Compared with the prior art, the utility model has the beneficial effects that:

the ethylene and styrene device uses the circular flame with ultra-low NO_XThe inner gas pipe and the outer gas pipe of the burner spray gas in stages, and respectively spray the gas to the primary combustion area and the secondary combustion area, the tail gas pipe sends the tail gas after the combustion of the primary combustion area to the secondary combustion area, and the combustion stage and flue gas backflow technology is adopted to inhibit NO_XThe primary fuel accounts for 30 percent of the total fuel, the secondary fuel accounts for 70 percent of the total fuel, the primary fuel and the air are mixed to form a primary combustion area, the oxygen-poor smoke at the outlet of the primary combustion area and the secondary fuel are mixed to form a secondary combustion area, the air of the primary combustion area is more and less, the reaction atmosphere is leaner, the reaction temperature is low under the lean fuel atmosphere, the generation of thermal NOx is inhibited at low temperature, the oxygen concentration of the smoke generated under the lean fuel atmosphere of the primary combustion area is far lower than that of the air, namely the smoke enters a secondary combustion areaThe secondary combustion zone is an oxygen-lean component, and the combination of the oxygen-lean component and the secondary fuel also substantially suppresses the formation of NOx.

The dilution effect of the returned flue gas leads to lower oxygen concentration in the outlet flue gas of the primary combustion zone relative to the fuel classification technology, and the lower oxygen concentration of the primary combustion zone is obviously beneficial to the emission reduction of NOx of the secondary combustion zone. The secondary fuel sprays at a high speed along the inclination angle of the fire pan brick, so that the backflow flue gas ejected by the high-speed jet flows to the secondary combustion area along the inclination angle of the fire pan brick, the backflow flue gas entering the secondary combustion area is quickly mixed with the flue gas and the secondary fuel in the primary combustion area for combustion, and the whole oxygen concentration of the secondary combustion area is low due to the dilution effect of the backflow flue gas, so that the generation of NO x in the secondary combustion area is inhibited.

Drawings

FIG. 1 shows the ultra-low NO of a circular flame for ethylene and styrene plants_XA schematic front view cross-sectional view of a burner.

FIG. 2 shows the ultra-low NO of the circular flame for ethylene and styrene devices_XA schematic top view of the burner.

Fig. 3 is a front cross-sectional view of the damper.

Fig. 4 is a schematic front view of the air regulating valve.

FIG. 5 is a front cross-sectional view of the connection of the shaft and the sleeve.

In the figure: 1. the device comprises an outer gas pipe 2, a barrel 3, an pilot lamp 4, a tail gas pipe 5, an air adjusting valve 6, a silencer 7, an air supplement pump 8, an air supplement check valve 9, an air inlet check valve 10, a booster pump 11, a stop valve 12, a flame arrester 13, an exhaust check valve 14, an injection pump 15, an air inlet pipe 16, an inner gas pipe 17, a secondary combustion area 18, a primary combustion area 19, an opening 20, a valve body 21, a rotating shaft 22, a sleeve 23, a driving valve plate 24, a driven valve plate 25, a supporting plate 26, a limiting plate 27, a worm 28 and a worm wheel.

Detailed Description

Fig. 1 to 5 are preferred embodiments of the present invention, and the present invention will be further described with reference to fig. 1 to 5.

Circular flame ultralow NO for ethylene and styrene device_XThe combustor, including the combustor main part, interior trachea 16, outer trachea 1 and tail gas pipe 4, the bottom of combustor main part is connected with air regulating valve 5, the upper portion of combustor main part is by having set gradually primary combustion district 18 and secondary combustion district 17 supreme down, interior trachea 16 all is provided with the nozzle with outer trachea 1's upper end, interior trachea 16's upper end extends in primary combustion district 18, outer trachea 1's upper end sets up in secondary combustion district 17 one side, and with gas injection to secondary combustion district 17, tail gas pipe 4 sets up between primary combustion district 18 and secondary combustion district 17, tail gas pipe 4's upper end is provided with the nozzle, and with tail gas injection to secondary combustion district 17. The ethylene and styrene device uses the circular flame with ultra-low NO_XThe inner gas pipe 16 and the outer gas pipe 1 of the burner inject gas in stages and respectively inject the gas to the primary combustion area 18 and the secondary combustion area 17, the tail gas pipe 4 sends the tail gas after the combustion of the primary combustion area 18 to the secondary combustion area 17, and the combustion stage and flue gas backflow technology is adopted to inhibit NO_XThe primary fuel accounts for 30 percent of the total fuel, the secondary fuel accounts for 70 percent of the total fuel, the primary fuel and the air are mixed to form a primary combustion area 18, the oxygen-poor flue gas at the outlet of the primary combustion area 18 and the secondary fuel are mixed to form a secondary combustion area 17, the air of the primary combustion area 18 is more fuel and less fuel, the reaction atmosphere is leaner, the reaction temperature under the fuel-poor atmosphere is low, the generation of thermal NOx is inhibited at low temperature, the oxygen concentration of the flue gas generated under the fuel-poor atmosphere of the primary combustion area 18 is far lower than that of the air, namely, the oxygen-poor component enters the secondary combustion area 17, and the combination of the oxygen-poor component and the secondary fuel actually inhibits the generation of the NOx.

The present invention is further described with reference to the following detailed description, however, it should be understood by those skilled in the art that the detailed description given herein with respect to the accompanying drawings is for better explanation and that the present invention is not necessarily limited to the specific embodiments, but rather, for equivalent alternatives or common approaches, may be omitted from the detailed description, while still remaining within the scope of the present application.

Specifically, the method comprises the following steps: as shown in fig. 1: the combustor main part includes the fire pan brick of

barrel

2 and 2 upsides of barrel, and the fire pan brick is built into the drum coaxial with barrel 2, and the drum coaxial coupling that the upper end of barrel 2 and the fire pan brick were built into to form primary combustion area 18 in the drum that the fire pan brick of barrel 2 upsides was built into, form secondary combustion area 17 at the top of the drum that the fire pan brick was built into. The bottom right side of combustor main part is provided with air regulating valve 5, can adjust the intake of combustor main part through air regulating valve 5, and the right side of air regulating valve 5 is provided with silencer 6.

Be provided with the pilot burner 3 and interior gas pipe 16 in the combustor main part, in pilot burner 3 and interior gas pipe 16 stretched into the combustor main part by the bottom of barrel 2, the upper end of pilot burner 3 stretched into the middle part of a combustion zone 18, and the top of interior gas pipe 16 is provided with the nozzle, and the top of interior gas pipe 16 extends the downside of a combustion zone 18. Two inner gas pipes 16 are evenly distributed around the burner body at intervals.

Outer gas pipe 1 sets up in the outside of barrel 2, and the top of outer gas pipe 1 also is provided with the nozzle, and the upper end of outer gas pipe 1 passes and sets up at the top of combustor main part behind the fire pan brick, and the top of outer gas pipe 1 is provided with the nozzle to spout the secondary combustion district 17 at combustor main part top with the gas. The tail gas pipe 4 sets up outside barrel 2, and the upper end of tail gas pipe 4 is provided with the nozzle, and the nozzle of tail gas pipe 4 spouts the tail gas to secondary combustion district 17, and the lower extreme of tail gas pipe 4 stretches out the fire pan brick downwards, and the lower extreme of tail gas pipe 4 is connected with injection apparatus to lower part intercommunication through injection apparatus and primary combustion district 18.

The injection device includes a booster pump 10, an injection pump 14, and a shutoff valve 11. The input port of booster pump 10 is linked together with outer gas pipe 1, and is provided with air inlet check valve 9 between the input port of booster pump 10 and the outer gas pipe 1, and the delivery outlet of booster pump 10 is linked together with the high-pressure medium entry of injection pump 14 behind the series connection stop valve 11, still is provided with spark arrester 12 and exhaust check valve 13 between the high-pressure medium entry of booster pump 10 and injection pump 14, and stop valve 11, spark arrester 12 and exhaust check valve 13 set gradually along the air current direction. The low pressure medium inlet of injection pump 14 passes through intake pipe 15 and the bottom intercommunication of primary combustion district 18, and the one end of intake pipe 15 is linked together with the low pressure medium inlet of injection pump 14, and in the other end stretched into the combustor main part, and the inlet end of intake pipe 15 is buckled to the direction that is close to primary combustion district 18 to can rely on injection pump 14 to draw the tail gas in the primary combustion district 18. The output port of the jet pump 14 is communicated with the lower end of the tail gas pipe 4, so that the flue gas is jetted to the secondary combustion area 17.

The outer gas pipe 1 is also connected with an air supplement pump 7, the input port of the air supplement pump 7 is communicated with the atmosphere, and the output port of the air supplement pump 7 is communicated with the outer gas pipe 1 after being connected with an air supplement check valve 8 in series, so that air can be supplemented into the outer gas pipe 1, and the phenomenon that the combustor cannot work normally due to insufficient oxygen is avoided.

As shown in fig. 1 and 2: the outer gas pipes 1 are uniformly distributed around the burner main body at intervals, and a tail gas pipe 4 is arranged between every two adjacent outer gas pipes 1. The top of combustor main part 1 is provided with opening 19, and opening 19 and outer gas pipe 1 one-to-one, and opening 19 just sets up with the nozzle of the outer gas pipe 1 that corresponds, guarantees that the gas in the outer gas pipe 1 can be arranged to in the secondary combustion district 17.

As shown in FIGS. 3-4: the air regulating valve 5 comprises a valve body 20, a valve plate and a rotating shaft 21, wherein the valve body 20 is in a cylindrical shape with two open ends, the rotating shaft 21 is rotatably arranged on the valve body 20, the rotating shaft 21 is perpendicular to the axis of the valve body 20, the valve plate is arranged in the valve body 20 and is arranged on the rotating shaft 21 and synchronously swings along with the rotation of the rotating shaft 21, so that the valve plate is adjusted, and the air volume passing through the valve body 20 is adjusted through the valve plate. The rotating shaft 21 is connected with an operating device, and the rotating shaft 21 can be driven to rotate through the operating device, so that the air quantity passing through the valve body 20 is adjusted through the valve plate.

The valve plate includes initiative valve plate 23 and passive valve plate 24, and the cover is equipped with sleeve pipe 22 on the pivot 21, and sleeve pipe 22 and pivot 21 relative rotation set up, and sleeve pipe 22 is rotatable to be installed on valve body 20. The middle of the sleeve 22 is provided with a long hole which is arranged around the sleeve 21, and the central angle of the sleeve 22 corresponding to the long hole is 180 degrees. The driving valve plate 23 penetrates through the long hole and then is fixedly connected with the rotating shaft 21, the driven valve plate 24 is fixedly connected with the sleeve 22, and a torsion spring (not shown in the figure) is arranged between the sleeve 22 and the rotating shaft 21 and enables the driven valve plate 24 to swing leftwards.

A limiting plate 26 is arranged on the valve body 20, the limiting plate 26 is arranged on the lower side of the sleeve 22, a supporting plate 25 is arranged on the sleeve 22, the supporting plate 25 is arranged opposite to the driven valve plate 24, and when the driven valve plate 24 swings to a vertical downward position and seals the lower portion of the valve body 20, the supporting plate 25 is just supported on the right side of the limiting plate 26. Due to the limit of the limit plate 26 and the support plate 25, when the passive valve plate 24 swings to the right below, that is, when the lower portion of the valve body 20 is closed, the passive valve plate 24 is located at the end point of the stroke, and at this time, due to the limit of the long hole, when the active valve plate 23 swings to the right above the passive valve plate 24, the active valve plate 23 is also located at the end point of the stroke.

As shown in fig. 3: when the rotating shaft 21 rotates counterclockwise, the driving valve plate 23 rotates synchronously with the rotating shaft 21, and at this time, the driven valve plate 24 seals the lower part of the valve body 20 all the time due to the existence of the torsion spring, and the air volume at the upper part of the valve body 20 can be adjusted only through the driving valve plate 23. The driving valve plate 23 continues to rotate until the driving valve plate 23 is attached to the driven valve plate 24, at this time, the rotating shaft 21 rotates anticlockwise, the driving valve plate 23 drives the driven valve plate 24 to synchronously swing, the whole valve body 20 can be opened, the air volume of the whole valve body 20 can be adjusted, and the adjustment is convenient.

As shown in fig. 5: the operating device comprises a worm wheel 28 and a worm 27, the worm 27 is coaxially connected with the rotating shaft 21 and drives the rotating shaft 21 to synchronously rotate, the worm wheel 28 is rotatably arranged on the valve body 20, the worm wheel 28 is meshed with the worm 27, a crank is arranged on the worm wheel 28, the rotating shaft 21 can be driven to rotate through the crank, and then the air quantity of the valve body 20 is adjusted.

The foregoing is directed to preferred embodiments of the present invention, other and further embodiments of the utility model may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow. However, any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention are within the protection scope of the technical solution of the present invention.

Claims

1. Circular flame ultralow NO for ethylene and styrene device_XA burner, characterized by: comprises a burner main bodyThe utility model provides a burner, interior trachea (16), outer trachea (1) and tail gas pipe (4), the bottom of combustor main part is connected with air regulating valve (5), the upper portion of combustor main part is by lower supreme primary combustion district (18) and secondary combustion district (17) of having set gradually, the upper end of interior trachea (16) and outer trachea (1) all is provided with the nozzle, the upper end of interior trachea (16) extends in primary combustion district (18), the upper end of outer trachea (1) sets up in secondary combustion district (17) one side, and spout gas to secondary combustion district (17), tail gas pipe (4) set up between primary combustion district (18) and secondary combustion district (17), the upper end of tail gas pipe (4) is provided with the nozzle, and spout tail gas to secondary combustion district (17).

2. The ultra-low NO of circular flame for ethylene and styrene plant as claimed in claim 1_XA burner, characterized by: the inner gas pipes (16) are arranged around the burner body at intervals.

3. The ultra-low NO of circular flame for ethylene and styrene plant as claimed in claim 1_XA burner, characterized by: the outer gas pipes (1) are arranged around the burner body at intervals, and a tail gas pipe (4) is arranged between every two adjacent outer gas pipes (1).

4. The ultra-low NO of the circular flame for ethylene and styrene apparatus as claimed in claim 1 or 3_XA burner, characterized by: the burner is characterized in that openings (19) are formed in the top of the burner body, the openings (19) correspond to the outer gas pipes (1) one by one, and the openings are opposite to burners of the corresponding outer gas pipes (1).

5. The ultra-low NO of circular flame for ethylene and styrene plant as claimed in claim 1_XA burner, characterized by: and a jet device for pressurizing tail gas is arranged between the primary combustion area (18) and the tail gas pipe (4).

6. The ultra-low NO of circular flame for ethylene and styrene plant as claimed in claim 5_XA burner, characterized by: injection apparatus include jet pump (14), booster pump (10) and stop valve (11), the input port and outer gas pipe (1) intercommunication of booster pump (10), the delivery outlet of booster pump (10) establish ties behind stop valve (11) and the high-pressure medium entry intercommunication of jet pump (14), the low pressure medium entry of jet pump (14) passes through intake pipe (15) and the bottom intercommunication in primary combustion district (18), the delivery outlet and the tail gas pipe (4) intercommunication of jet pump (14).

7. The ultra-low NO of circular flame for ethylene and styrene plant as claimed in claim 1_XA burner, characterized by: air regulating valve (5) include valve body (20), valve plate and pivot (21), valve body (20) are the open tube-shape in both ends, rotatable the installing in valve body (20) of pivot (21), the valve plate sets up in valve body (20), the valve plate links to each other with pivot (21) to along with the rotation of pivot (21) and synchronous oscillation, pivot (21) are connected with controlling device.

8. The ultra-low NO of circular flame for ethylene and styrene plant as claimed in claim 7_XA burner, characterized by: the valve plate include initiative valve plate (23) and passive valve plate (24), pivot (21) overcoat is equipped with sleeve pipe (22), be provided with the slot hole on sleeve pipe (22), and the slot hole encircles sleeve pipe (22) and sets up, the tip of initiative valve plate (23) passes the slot hole after and links to each other with pivot (21), passive valve plate (24) link to each other with sleeve pipe (22), be provided with on valve body (20) to the spacing limiting plate (26) of sleeve pipe (22), be provided with on sleeve pipe (22) with limiting plate (26) complex backup pad (25), backup pad (25) and passive valve plate (24) are just right to setting up, be provided with the torsional spring between passive valve plate (24) and initiative valve plate (23), the torsional spring promotes the direction swing of passive valve plate (24) to initiative valve plate (23).

9. Ethylene as claimed in claim 7And ultra-low NO of circular flame for styrene device_XA burner, characterized by: the operating device comprises a worm wheel (28) and a worm (27), the worm (27) is connected with the rotating shaft (21), the worm wheel (28) is meshed with the worm (27), and a crank is arranged on the worm wheel (28).