CN215001584U

CN215001584U - Novel mixed combustor for coal, gas and oil

Info

Publication number: CN215001584U
Application number: CN202121076999.XU
Authority: CN
Inventors: 邱学猛; 何军福; 陈阔; 周学楚; 胡耀华; 万军; 周克
Original assignee: Yunnan Energy Investment Qujing Power Generation Co ltd
Current assignee: Yunnan Energy Investment Qujing Power Generation Co ltd
Priority date: 2021-05-19
Filing date: 2021-05-19
Publication date: 2021-12-03
Anticipated expiration: 2031-05-19

Abstract

The utility model discloses a coal, gas, novel co-combustion ware of oil, including the wind channel, combustor casing and coal powder injection pipe, the wind channel is including the vertical section that connects gradually, bend section and horizontal segment, install first shrouding at the coal powder injection pipe tip that lies in the bend section outside, install buggy import at the coal powder injection pipe top that is close to first shrouding one side, buggy import is through advancing coal pipe and a buggy feed section of thick bamboo intercommunication, be provided with respectively on the first shrouding and extend to the intraductal little oil gun of coal powder injection, little gas gun and burning torch, at the little oil gun entrance point that lies in the first shrouding outside through advancing oil pipe way and fuel feed jar intercommunication, the little gas gun entrance point that lies in the first shrouding outside is through admitting air pipeline and gas feed jar intercommunication. The utility model discloses reduced the unit by a wide margin and started the frequency of shutting down, improved boiler combustion stability, increaseed low-quality coal and mixed the burning proportion, reduced coal-fired cost, had that the arrangement is reasonable, compact structure, investment economize, reform transform the advantage that the work load is little.

Description

Novel mixed combustor for coal, gas and oil

Technical Field

The utility model relates to a combustion apparatus technical field, concretely relates to novel co-combustion ware of coal, gas, oil.

Background

The coal gas is an important byproduct of a metallurgical enterprise, and comprises blast furnace gas, coke oven gas, converter gas and the like, and the utilization mode of the coal gas is mainly combustion utilization of a boiler and a heating furnace. At present, a boiler is adopted to mix and burn coke oven gas, the coke oven gas is used for replacing part of coal powder in the normal operation stage of the boiler, and the coke oven gas or diesel oil is used for directly igniting and stably burning the coal powder in the ignition stage and the low-load stable burning stage of the boiler, so that the aims of reducing the fuel consumption cost and improving the economic benefit of boiler operation are fulfilled, and the consumption of high-calorific-value coal and the consumption of unit startup, shutdown and stable fuel consumption are greatly reduced while the safe and stable operation of a unit is ensured. But current combustor function singleness mostly is single gas burner, coal powder combustor or fuel oil burner, also has partial two unification combustors, there is buggy, coal gas seldom and by trinity combustor, adopt single combustor, often can receive the influence that certain fuel reserve is not enough or the supply lacks in the in-process of using, lead to boiler outage or reduce the load operation and cause the civil problem or the production accident, simultaneously, if change the fuel, just need to change system's equipment, this normal operating that not only influences equipment, the cost of using has increased in the intangible. Therefore, it is an objective need to develop a novel coal, gas and oil mixed burner which has compact structure, less investment and less modification workload and can greatly improve the combustion stability.

Disclosure of Invention

An object of the utility model is to provide a compact structure, small investment, the little novel co-combustion ware of coal, gas, oil that reforms transform work load, can improve combustion stability by a wide margin.

The utility model aims at realizing the purpose, which comprises an air duct, a burner shell and a coal injection pipe, wherein the air duct comprises a vertical section, a bend section and a horizontal section which are connected in sequence, a ventilation valve is arranged on the vertical section, the burner shell is of a cone-shaped structure, the small end of the burner shell is sleeved at the end part of the horizontal section, the coal injection pipe is arranged on the bend section and extends to the end part in the horizontal section, a first closing plate is arranged at the end part of the coal injection pipe positioned at the outer side of the bend section, a coal powder inlet is arranged at the top part of the coal injection pipe close to one side of the first closing plate, the coal powder inlet is communicated with a coal powder feeding cylinder through a coal feeding pipeline, a micro oil gun, a micro air gun and an ignition gun which extend into the coal injection pipe and are level with the end part of the coal injection pipe are respectively arranged on the first closing plate, the horizontal central axis of the micro oil gun is higher than the horizontal central axis of the coal injection pipe, the ignition gun and the micro air gun are positioned at the same height in the coal injection pipe, and the horizontal central axis of the ignition gun and the micro-air gun is lower than the horizontal central axis of the coal injection pipe, the inlet end of the micro-oil gun positioned outside the first sealing plate is communicated with the fuel oil supply tank through an oil inlet pipeline, and the inlet end of the micro-air gun positioned outside the first sealing plate is communicated with the fuel gas supply tank through an air inlet pipeline.

Further, the tiny-oil gun is including spouting oil pipe and central trachea, the oil feed end of spouting the oil pipe is located the outside of first shrouding, it is intraductal that the end of producing oil is located the coal powder injection, spout the oil feed end of oil pipe and install the second shrouding, install fuel inlet on the second shrouding, the fuel sprayer is installed to the end of producing oil of spouting the oil pipe, the center trachea passes and extends to the inside of spouting the oil pipe behind the second shrouding, install the admission valve on the central trachea that is located second shrouding one side, be provided with the sleeve pipe between the end of giving vent to anger of central trachea and the end of producing oil of spouting the oil pipe, rotate through sealed bearing between sleeve pipe and the center trachea and be connected, it is provided with the helicla flute to run through on the sheathed tube pipe wall, be provided with a plurality of intercommunicating pores on the intraductal center trachea outer wall of sleeve pipe, be provided with a plurality of swirlers between sleeve pipe and the oil pipe.

Preferably, the swirler includes a fixed ring and a plurality of swirl vanes fixed on the fixed ring, the fixed ring is fixedly connected with the sleeve, the plurality of swirl vanes are uniformly arranged along the circumferential direction of the fixed ring, and the swirl vanes are arranged in a manner of deflecting relative to the central axis of the fixed ring. The deflection directions of the swirl vanes on two adjacent cyclones relative to the fixed ring are opposite.

Furthermore, at least two supporting plates are arranged between the coal injection pipe and the horizontal section of the air duct at intervals, air guide holes are uniformly distributed in the supporting plates, the air guide holes between every two adjacent supporting plates are arranged in a staggered mode, and the air guide holes are rectangular holes or elliptical holes.

The utility model discloses the effective fruit that produces is: the micro-gun, the micro-air gun and the ignition gun are additionally arranged in the coal injection pipe, so that the burner can burn coal powder, simultaneously fuel oil and coal gas can be mutually reserved, when the boiler runs, the coal powder is directly ignited and stably combusted by coke oven gas or diesel oil in the ignition stage and the low-load stable combustion stage of the boiler, so that the start and stop of the unit with less oil or without oil are realized, and can ensure the requirements of oil feeding or gas feeding and stable combustion when the boiler is started, stopped, has low load and has unstable combustion, the coal blending combustion system has the advantages of reasonable arrangement mode, compact structure, low investment and low modification workload, can generate better economic and social benefits, and is easy to popularize and use.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic side view of the present invention;

FIG. 3 is a schematic view of the construction of the micro oil gun 8;

FIG. 4 is a schematic view of the structure of swirler 87;

in the figure, 1-air channel, 2-air adjusting valve, 3-burner shell, 4-coal injection pipe, 5-coal powder inlet, 6-coal powder feeding cylinder, 7-first sealing plate, 8-micro oil gun, 81-oil injection pipe, 82-central air pipe, 83-second sealing plate, 84-fuel oil inlet, 85-oil nozzle, 86-sleeve, 87-swirler, 871-fixing ring, 872-swirl vane, 88-communicating hole, 9-micro air gun, 10-ignition gun, 11-fuel oil feeding tank, 12-gas feeding tank, 13-support plate and 14-air guiding hole.

Detailed Description

The following further describes the present invention with reference to the attached drawings, but the present invention is not limited in any way, and any changes or improvements based on the teaching of the present invention all belong to the protection scope of the present invention.

As shown in fig. 1-4, the utility model discloses an air duct 1, combustor casing 3 and coal injection pipe 4, air duct 4 is including vertical section, bend section and the horizontal segment that connects gradually, and air duct 1 is used for carrying combustion air in to combustor casing 3, install ventilation valve 2 on the vertical section, ventilation valve 2 can realize combustion air's intake and adjust, and combustor casing 3 is the cone form structure, the tip at the horizontal segment is established to the tip cover of combustor casing 3, coal injection pipe 4 installs the tip on the bend section and extends to the horizontal segment, installs first shrouding 7 at coal injection pipe 4 tip that lies in the bend section outside, installs buggy import 5 at coal injection pipe 4 top that is close to first shrouding 7 one side, buggy import 5 is through advancing coal pipe and buggy feed cylinder 6 intercommunication, be provided with respectively on the first shrouding 7 extend to in coal injection pipe 4 and with the little oil gun 8, the parallel and level of coal injection pipe 4 tip, Little air gun 9 and ignition gun 10, the horizontal central axis of little oil gun 8 is higher than the horizontal central axis of coal-injection pipe 4, ignition gun 10 and little air gun 9 are located same height in coal-injection pipe 4, and the horizontal central axis of ignition gun 10 and little air gun 9 is less than the horizontal central axis of coal-injection pipe 4, and the little oil gun 8 entrance point that is located the first shrouding 7 outside feeds through with fuel feed tank 11 through advancing oil pipe, and the little air gun 9 entrance point that is located the first shrouding 7 outside feeds through with gas feed tank 12 through the inlet air pipeline.

The utility model discloses a working process is: when the burner is used, pulverized coal in the pulverized coal feeding cylinder 6 enters the coal injection pipe 4 through the pulverized coal inlet 5, is injected through the coal injection pipe 4 and is mixed with combustion-supporting air in the air duct 1, and is ignited by the ignition gun 10 to be combusted in the burner shell 3, under the condition of insufficient combustion in the ignition stage and the low-load stable combustion stage of the boiler, at the moment, the pulverized coal can be supported by the micro oil gun 8 or the micro air gun 9, the pulverized coal is directly ignited and stably combusted by coke oven gas or diesel oil, so that the start and stop of a unit without oil or oil are realized, the requirements of oil feeding or gas feeding and stable combustion during the start, the stop, the low load and the combustion of the boiler can be ensured, after the pulverized coal is sufficiently and stably combusted, the fuel oil or the coal gas can be stopped from being added into the micro oil gun 8 or the micro air gun 9, the pulverized coal can be combusted, and if the pulverized coal feeding system is under the insufficient condition, the pulverized coal feeding system can be closed, the gas or fuel oil is selected for combustion, and the fuel oil and the gas are mutually reserved, so that the shutdown frequency of the unit can be reduced, and the combustion stability of the combustor is improved.

Further, the micro oil gun 8 includes an oil injection pipe 81 and a central air pipe 82, an oil inlet end of the oil injection pipe 81 is located at the outer side of the first sealing plate 7, an oil outlet end of the oil injection pipe is located in the coal injection pipe 4, a second sealing plate 83 is installed at the oil inlet end of the oil injection pipe 81, a fuel inlet 84 is installed on the second sealing plate 83, an oil nozzle 85 is installed at the oil outlet end of the oil injection pipe 81, the central air pipe 82 passes through the second sealing plate 83 and extends into the oil injection pipe 81, an air inlet valve is installed on the central air pipe 82 located at one side of the second sealing plate 83, a sleeve 86 is disposed between the air outlet end of the central air pipe 82 and the oil outlet end of the oil injection pipe 81, the sleeve 86 is rotatably connected with the central air pipe 82 through a sealing bearing, a spiral groove is formed through the wall of the sleeve 86, a plurality of communication holes 88 are formed in the outer wall of the central air pipe 82 in the sleeve 86, and a plurality of swirlers 87 are disposed between the sleeve 86 and the oil injection pipe 81, when the burner uses fuel oil for burning, the fuel oil enters the fuel injection pipe 81 from the fuel oil inlet 84 and is atomized through the first swirler 8, the combustion-supporting gas enters the sleeve 86 from the central air pipe 82, passes through the spiral groove to form combustion-supporting gas rotational flow, enters the fuel injection pipe 81 and is mixed with the fuel oil atomization rotational flow to form mixed flow, and finally the mixed flow is sprayed out from the nozzle 85.

Further, in order to realize atomizing diesel oil for a plurality of times and improve the combustion effect of fuel oil, the swirler 87 comprises a fixing ring 871 and a plurality of swirl vanes 872 fixed on the fixing ring 871, the fixing ring 871 is fixedly connected with the sleeve 86, the plurality of swirl vanes 872 are uniformly arranged along the circumferential direction of the fixing ring 871, and the swirl vanes 872 are arranged in a manner of deflecting relative to the central axis of the fixing ring 871.

Preferably, the direction of deflection of the swirl blades 872 on two adjacent cyclones 87 is opposite to that of the fixed ring 871, so that the direction of the fuel atomization swirl is opposite to that of the combustion-supporting gas swirl, the collision of fuel atomization particles and high-speed combustion-supporting gas flow is more violent, the mixing is more sufficient and uniform, the mixing efficiency is high, the fuel combustion is more sufficient, the combustion efficiency is high, less harmful substances are generated, the use efficiency of diesel oil is high, and the energy-saving effect is achieved.

Furthermore, at least two supporting plates 13 are installed between the coal injection pipe 4 and the horizontal section of the air duct 1 at intervals, air guide holes 14 are uniformly distributed in the supporting plates 13, the air guide holes 14 between every two adjacent supporting plates 13 are arranged in a staggered mode, the supporting plates 13 can support the coal injection pipe 4 on one hand, and can uniformly distribute pulverized coal in the coal injection pipe 4 on the other hand, so that the combustion efficiency of the pulverized coal is improved, and preferably, the air guide holes 14 are rectangular holes or elliptical holes.

Claims

1. The utility model provides a novel co-combustion ware of coal, gas, oily, includes wind channel (1), combustor casing (3) and coal injection pipe (4), its characterized in that: the air flue (1) comprises a vertical section, a bent pipe section and a horizontal section which are sequentially connected, a ventilation valve (2) is installed on the vertical section, the burner shell (3) is of a cone-shaped structure, the small end of the burner shell (3) is sleeved at the end part of the horizontal section, the coal injection pipe (4) is installed on the bent pipe section and extends to the end part of the horizontal section, a first sealing plate (7) is installed at the end part of the coal injection pipe (4) positioned at the outer side of the bent pipe section, a coal powder inlet (5) is installed at the top of the coal injection pipe (4) close to one side of the first sealing plate (7), the coal powder inlet (5) is communicated with a coal powder feeding cylinder (6) through a coal feeding pipeline, a micro oil gun (8), a micro air gun (9) and an ignition gun (10) which extend into the coal injection pipe (4) and are flush with the end part of the coal injection pipe (4) are respectively arranged on the first sealing plate (7), and the horizontal central axis of the micro oil gun (8) is higher than the horizontal central axis of the coal injection pipe (4), the ignition gun (10) and the micro-air gun (9) are located at the same height in the coal injection pipe (4), the horizontal central axis of the ignition gun (10) and the horizontal central axis of the micro-air gun (9) are lower than the horizontal central axis of the coal injection pipe (4), the inlet end of the micro-oil gun (8) located on the outer side of the first sealing plate (7) is communicated with the fuel feeding tank (11) through an oil inlet pipeline, and the inlet end of the micro-air gun (9) located on the outer side of the first sealing plate (7) is communicated with the fuel feeding tank (12) through an air inlet pipeline.

2. The novel coal, gas and oil mixed burner as claimed in claim 1, characterized in that: the micro oil gun (8) comprises an oil injection pipe (81) and a central air pipe (82), wherein the oil inlet end of the oil injection pipe (81) is positioned on the outer side of a first sealing plate (7), the oil outlet end of the oil injection pipe is positioned in a coal injection pipe (4), a second sealing plate (83) is installed at the oil inlet end of the oil injection pipe (81), a fuel inlet (84) is installed on the second sealing plate (83), an oil nozzle (85) is installed at the oil outlet end of the oil injection pipe (81), the central air pipe (82) penetrates through the second sealing plate (83) and then extends into the oil injection pipe (81), an air inlet valve is installed on the central air pipe (82) positioned on one side of the second sealing plate (83), a sleeve (86) is arranged between the air outlet end of the central air pipe (82) and the oil outlet end of the oil injection pipe (81), the sleeve (86) is rotatably connected with the central air pipe (82) through a sealing bearing, and a spiral groove is arranged on the pipe wall of the sleeve (86) in a penetrating manner, a plurality of communicating holes (88) are formed in the outer wall of the central air pipe (82) in the sleeve (86), and a plurality of cyclones (87) are arranged between the sleeve (86) and the oil injection pipe (81).

3. The novel coal, gas and oil mixed burner as claimed in claim 2, characterized in that: the swirler (87) comprises a fixing ring (871) and a plurality of swirl vanes (872) fixed on the fixing ring (871), the fixing ring (871) is fixedly connected with the sleeve (86), the plurality of swirl vanes (872) are uniformly arranged along the circumferential direction of the fixing ring (871), and the swirl vanes (872) are axially deflected relative to the center of the fixing ring (871).

4. The novel coal, gas and oil mixed burner as claimed in claim 3, characterized in that: the deflecting directions of the swirl blades (872) on two adjacent swirlers (87) are opposite to that of the fixed ring (871).

5. The novel coal, gas and oil mixed burner as claimed in claim 1, characterized in that: at least two supporting plates (13) are installed between the coal injection pipe (4) and the horizontal section of the air duct (1) at intervals, air guide holes (14) are uniformly distributed in the supporting plates (13), and the air guide holes (14) between every two adjacent supporting plates (13) are arranged in a staggered mode.

6. The novel coal, gas and oil mixed burner as claimed in claim 5, characterized in that: the air guide holes (14) are rectangular holes or elliptical holes.