CN215001558U

CN215001558U - Steam low-nitrogen combustion system for reducing generation of nitrogen oxides in dry cement production

Info

Publication number: CN215001558U
Application number: CN202120398645.0U
Authority: CN
Inventors: 尚海平
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-02-23
Filing date: 2021-02-23
Publication date: 2021-12-03
Anticipated expiration: 2031-02-23

Abstract

The utility model discloses a low nitrogen combustion system of steam for dry process cement manufacture reduces nitrogen oxide and generates, including steam delivery end, steam storage equipment, flow control system, low nitrogen combustor and pre-heater, all connect gradually through the steam trunk line between steam delivery end, steam storage equipment and the flow control system, connect through the steam branch pipeline between flow control system and the low nitrogen combustor, fixed connection between low nitrogen combustor and the pre-heater. The utility model discloses a steam low nitrogen combustion system for dry process cement manufacture reduces nitrogen oxide and generates, this system adopts to change the dore furnace combustion technology, through the empty temperature peak value of reasonable control dore furnace, reduces the oxygen concentration around the fuel to implement the transformation to dore furnace pulverized coal burner, the moderate degree changes the interior burning intensity distribution situation of stove, reduces NOx's regeneration, thoroughly realizes the optimization burning of buggy, thereby the NOX of lowering system discharges.

Description

Steam low-nitrogen combustion system for reducing generation of nitrogen oxides in dry cement production

Technical Field

The utility model relates to a steam low nitrogen combustion technology field especially relates to a steam low nitrogen combustion system that is used for dry process cement manufacture to reduce nitrogen oxide and generates.

Background

When the novel dry-method cement production line is used for production, the generation of nitrogen oxides needs to be reduced, the regeneration of NOx is reduced, and the optimized combustion of pulverized coal is realized, so that the low NOx emission is realized.

SUMMERY OF THE UTILITY MODEL

The utility model aims at solving the defects existing in the prior art and providing a steam low-nitrogen combustion system for reducing the generation of nitrogen oxides in dry cement production.

In order to achieve the above purpose, the utility model adopts the following technical scheme: a low nitrogen combustion system of steam for dry process cement manufacture reduces nitrogen oxide and generates, including steam delivery end, steam storage device, flow control system, low nitrogen combustor and pre-heater, all connect gradually through the steam trunk line between steam delivery end, steam storage device and the flow control system, connect through the steam branch pipeline between flow control system and the low nitrogen combustor, fixed connection between low nitrogen combustor and the pre-heater, fixedly connected with buggy pipeline on the low nitrogen combustor.

As a further description of the above technical solution:

the vapor storage device includes a vapor storage tank.

As a further description of the above technical solution:

flow control system includes the steam control pipeline, the steam control pipeline comprises a plurality of seamless steel pipe fixed connection, and is a plurality of the equal fixed second flange that is provided with of seamless steel pipe tip, it is a plurality of all through second connecting bolt fixed connection between the second flange, the equal fixed cooperation of second connecting bolt tip has second coupling nut, and is a plurality of the equal fixed second winding pad that is provided with of second connecting flange junction, fixed flow control valve and the flowmeter of being provided with in flow control system upper end, through pipeline fixedly connected with condenser on the flowmeter, the condenser lower extreme is through three valves fixedly connected with differential pressure transmitter.

As a further description of the above technical solution:

the low-nitrogen combustor includes that the buggy advances pipe and steam conveying pipe, the buggy advances pipe and steam conveying pipe all through first flange and low-nitrogen combustor fixed connection, through first connecting bolt fixed connection between the first flange, first connecting bolt end fixing cooperation has first coupling nut, first connecting flange junction is fixed and is provided with first winding pad and asbestos washer, the buggy advances a horizontal coal conveying pipe of tub lower extreme fixedly connected with, horizontal coal conveying pipe keeps away from the fixed coal injection pipe that is provided with of one end that the buggy advances the pipe, steam conveying pipe end fixing is provided with steam jet.

As a further description of the above technical solution:

the preheater includes a reduction zone and a combustion zone.

As a further description of the above technical solution:

the steam control pipeline is fixedly installed through a plurality of hoops.

As a further description of the above technical solution:

the flowmeter comprises a pressure transmitter and a platinum resistor, and a stop valve is fixedly arranged between the flowmeter and the condenser.

As a further description of the above technical solution:

the outer wall of the horizontal coal conveying pipe is fixedly provided with a coal pipe sleeve, and a high-aluminum refractory castable is fixedly arranged between the coal pipe sleeve and the horizontal coal conveying pipe.

As a further description of the above technical solution:

the steam delivery end supplies heat through the waste heat of a boiler or a kiln tail of a cement plant, and the coal powder delivery pipeline adopts the original coal powder delivery pipeline of the cement plant.

The utility model discloses following beneficial effect has:

the utility model provides a steam low-nitrogen combustion system that is used for dry process cement manufacture to reduce nitrogen oxide and generates, the required steam of this system produces through boiler or kiln tail waste heat power generation (utilize cement factory original), through storage device, storage production possesses the system needs, suitable pressure, suitable temperature, carry in the low-nitrogen combustor through pressure pipeline, pre-heater kiln tail fuel (buggy) is ground through the coal pulverizer, provide the pre-heater fineness through the buggy pipeline, the suitable buggy of moisture, carry in the low-nitrogen combustor through the pipeline, steam and pre-heater kiln tail fuel (buggy) divide two different pipelines into in the low-nitrogen combustor, through the low-nitrogen combustor, the buggy is spout from steam spray gun periphery 360 degrees, steam spouts from central point-to-point through steam spray gun, at pre-heater combustion area intensive mixing, the occurrence reaction, can ensure that the dore furnace feeds the coal and burns completely, the steam with the temperature of about 350 degrees is utilized, the temperature peak value is reduced in the combustion process to reduce the thermal reaction NOx, the NOx emission is effectively reduced, the steam can not absorb heat from the burning coal dust, the coal consumption is not increased, but partial heat energy is provided for the decomposing furnace, and then a part of the coal dust is saved, and the use is very convenient.

The utility model provides a steam low nitrogen combustion system for dry process cement manufacture reduces nitrogen oxide and generates, this system adopts and changes the dore furnace combustion technology, empty temperature peak value through reasonable control dore furnace, reduce the oxygen concentration around the fuel, and implement the transformation to dore furnace pulverized coal burner, the moderate degree changes the interior burning intensity distribution situation of stove, reduce NOx's regeneration, thoroughly realize the optimization burning of buggy, thereby the NOX of lowering system discharges, the use of this system makes SNCR denitration aqueous ammonia quantity reduce 30% -100%, economic benefits of enterprise is showing, can also reduce the coal consumption, and can practice thrift the power consumption, effectively reduce NOx's emission, the cost that greatly reduced drops into, more energy-concerving and environment-protective.

Drawings

FIG. 1 is a control flow chart of a steam low-nitrogen combustion system for reducing the generation of nitrogen oxides in dry cement production according to the present invention;

FIG. 2 is a schematic structural diagram of a decomposing furnace of the steam low-nitrogen combustion system for reducing the generation of nitrogen oxides in the dry cement production according to the present invention;

FIG. 3 is a schematic view of the pipeline connection structure of the steam low-nitrogen combustion system for reducing the generation of nitrogen oxides in the dry cement production according to the present invention;

FIG. 4 is a front view of a steam control pipeline of the steam low-nitrogen combustion system for reducing the generation of nitrogen oxides in the dry cement production according to the present invention;

FIG. 5 is a side view of a steam control line of a steam low-NOx combustion system for reducing NOx generation in dry cement production according to the present invention;

FIG. 6 is a schematic diagram of the internal structure of the low-nitrogen combustor of the steam low-nitrogen combustion system for reducing the generation of nitrogen oxides in the dry cement production according to the present invention;

fig. 7 is a schematic structural diagram of a low-nitrogen burner tip of a steam low-nitrogen combustion system for reducing nitrogen oxide generation in dry cement production.

Illustration of the drawings:

1. a steam delivery end; 2. a vapor storage device; 21. a vapor storage tank; 3. a flow control system; 4. A pulverized coal conveying pipeline; 5. a low-nitrogen burner; 51. feeding pulverized coal into a pipe; 52. a steam delivery pipe; 53. a first connecting flange; 54. a first winding pad; 55. an asbestos washer; 56. a first connecting bolt; 57. a first coupling nut; 58. a horizontal coal conveying pipe; 59. a coal injection pipe; 510. a steam spray head; 511. a coal pipe casing pipe; 512. high-alumina refractory castable; 6. a preheater; 61. a reduction zone; 62. a combustion zone; 7. a main steam pipeline; 8. a steam control pipeline; 81. seamless steel pipes; 82. a second connecting flange; 83. a second winding pad; 84. a second connecting bolt; 85. a second coupling nut; 86. a flow regulating valve; 87. a flow meter; 88. a pressure transmitter; 89. a platinum resistor; 810. clamping a hoop; 811. a stop valve; 812. a condenser; 813. a three-valve group; 814. a differential pressure transmitter; 9. and (5) dividing the steam into pipelines.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention; the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance, and furthermore, unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Referring to fig. 1-7, the present invention provides an embodiment: a low nitrogen combustion system of steam for dry process cement manufacture reduces nitrogen oxide and generates, including steam delivery end 1, steam storage device 2, flow control system 3, low nitrogen combustor 5 and pre-heater 6, steam delivery end 1, all connect gradually through steam trunk line 7 between steam storage device 2 and the flow control system 3, connect through steam branch pipeline 9 between flow control system 3 and the low nitrogen combustor 5, fixed connection between low nitrogen combustor 5 and the pre-heater 6, fixedly connected with buggy pipeline 4 on the low nitrogen combustor 5.

The steam storage device 2 comprises a steam storage tank 21, the flow control system 3 comprises a steam control pipeline 8, the steam control pipeline 8 is formed by fixedly connecting a plurality of seamless steel pipes 81, the end parts of the seamless steel pipes 81 are fixedly provided with second connecting flanges 82, the second connecting flanges 82 are fixedly connected through second connecting bolts 84, the end parts of the second connecting bolts 84 are fixedly matched with second connecting nuts 85, the joints of the second connecting flanges 82 are fixedly provided with second winding pads 83, the upper end of the flow control system 3 is fixedly provided with a flow regulating valve 86 and a flow meter 87, the flow meter 87 is fixedly connected with a condenser 813 through a pipeline, the lower end of the condenser 812 is fixedly connected with a differential pressure transmitter 814 through a three-valve set, the low-nitrogen combustor 5 comprises a pulverized coal inlet pipe 51 and a steam delivery pipe 52, the pulverized coal inlet pipe 51 and the steam delivery pipe 52 are fixedly connected with the low-nitrogen combustor 5 through a first connecting flange 53, the first connecting flanges 53 are fixedly connected through first connecting bolts 56, the end portions of the first connecting bolts 56 are fixedly matched with first connecting nuts 57, the connecting portions of the first connecting flanges 53 are fixedly provided with first winding pads 54 and asbestos washers 55, the lower end of the coal dust feeding pipe 51 is fixedly connected with a horizontal coal conveying pipe 58, one end, far away from the coal dust feeding pipe 51, of the horizontal coal conveying pipe 58 is fixedly provided with a coal spraying pipe 59, and the end portion of the steam conveying pipe 52 is fixedly provided with a steam nozzle 510.

Preheater 6 includes reduction zone 61 and combustion area 62, steam control pipeline 8 carries out fixed mounting through a plurality of clamps 810, flowmeter 87 includes pressure transmitter 88 and platinum resistance 89, the fixed stop valve 811 that is provided with between flowmeter 87 and the condenser 812, the fixed coal pipe sleeve pipe 511 that is provided with of horizontal coal conveying pipe 58 outer wall, the fixed high alumina refractory castable 512 that is provided with between coal pipe sleeve pipe 511 and the horizontal coal conveying pipe 58, steam delivery end 1 supplies heat through the boiler or kiln tail waste heat of cement plant, coal dust pipeline 4 adopts the original coal dust pipeline of cement plant.

The working principle is as follows: when the steam low-nitrogen combustion system for reducing nitrogen oxide generation in dry cement production is used, steam required by the system is generated by waste heat power generation of a boiler or a kiln tail (the original steam of a cement plant is utilized), the steam is stored and produced by a storage device and is required by the system, the steam is suitable for pressure and temperature, the steam is conveyed into a low-nitrogen combustor 5 through a pressure pipeline, kiln tail fuel (coal powder) of a preheater 6 is ground through coal mill, the fineness of the preheater 6 is provided through a coal powder conveying pipeline 4, the coal powder with suitable moisture is conveyed into the low-nitrogen combustor 5 through a pipeline, the steam and the kiln tail fuel (coal powder) of the preheater 6 enter the low-nitrogen combustor 5 through two different pipelines, the coal powder is sprayed out from the periphery of a steam spray gun by 360 degrees, the steam is sprayed out from the central position through the steam spray gun, the steam is fully mixed in a combustion area 62 of the preheater 6, and the reaction occurs, the system can ensure that the decomposing furnace can completely burn coal, steam of about 350 degrees is utilized, in the burning process, the temperature peak value is reduced to reduce the thermal reaction NOx, the NOx emission is effectively reduced, the steam can not absorb heat from burning coal dust, the coal consumption is not increased, but partial heat energy is provided for the decomposing furnace, and further a part of coal dust is saved.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications and variations can be made in the embodiments or in part of the technical features of the embodiments without departing from the spirit and the scope of the invention.

Claims

1. A low nitrogen combustion system of steam for dry cement manufacture reduces nitrogen oxide and produces, includes steam delivery end (1), steam storage equipment (2), flow control system (3), low nitrogen combustor (5) and preheater (6), its characterized in that: all connect gradually through steam trunk line (7) between steam delivery end (1), steam storage equipment (2) and flow control system (3), connect through steam branch pipeline (9) between flow control system (3) and low nitrogen combustor (5), fixed connection between low nitrogen combustor (5) and pre-heater (6), fixedly connected with buggy pipeline (4) on low nitrogen combustor (5).

2. The steam low-nitrogen combustion system for reducing nitrogen oxide generation in dry cement production according to claim 1, characterized in that: the vapour storage device (2) comprises a vapour storage tank (21).

3. The steam low-nitrogen combustion system for reducing nitrogen oxide generation in dry cement production according to claim 1, characterized in that: the flow control system (3) comprises a steam control pipeline (8), the steam control pipeline (8) is formed by fixedly connecting a plurality of seamless steel pipes (81), the end parts of the seamless steel pipes (81) are fixedly provided with second connecting flanges (82), the second connecting flanges (82) are fixedly connected through second connecting bolts (84), second connecting nuts (85) are fixedly matched at the end parts of the second connecting bolts (84), second winding pads (83) are fixedly arranged at the joints of the second connecting flanges (82), the upper end of the flow control system (3) is fixedly provided with a flow control valve (86) and a flow meter (87), the flow meter (87) is fixedly connected with a condenser (812) through a pipeline, the lower end of the condenser (812) is fixedly connected with a differential pressure transmitter (814) through a three-valve group (813).

4. The steam low-nitrogen combustion system for reducing nitrogen oxide generation in dry cement production according to claim 1, characterized in that: low-nitrogen burner (5) advance pipe (51) and steam delivery pipe (52) including the buggy, buggy advance pipe (51) and steam delivery pipe (52) all through first flange (53) and low-nitrogen burner (5) fixed connection, through first connecting bolt (56) fixed connection between first flange (53), first connecting bolt (56) end fixing cooperation has first coupling nut (57), first connecting flange (53) junction is fixed to be provided with first winding pad (54) and asbestos washer (55), buggy advances pipe (51) lower extreme fixedly connected with horizontal coal conveying pipe (58), the one end that buggy advanced pipe (51) was kept away from in horizontal coal conveying pipe (58) is fixed to be provided with coal injection pipe (59), steam delivery pipe (52) end fixing is provided with steam jet (510).

5. The steam low-nitrogen combustion system for reducing nitrogen oxide generation in dry cement production according to claim 1, characterized in that: the preheater (6) includes a reduction zone (61) and a combustion zone (62).

6. The steam low-nitrogen combustion system for reducing nitrogen oxide generation in dry cement production according to claim 3, characterized in that: the steam control pipeline (8) is fixedly installed through a plurality of clamping bands (810).

7. The steam low-nitrogen combustion system for reducing nitrogen oxide generation in dry cement production according to claim 3, characterized in that: flowmeter (87) include pressure transmitter (88) and platinum resistance (89), fixed stop valve (811) of being provided with between flowmeter (87) and condenser (812).

8. The steam low-nitrogen combustion system for reducing nitrogen oxide generation in dry cement production according to claim 4, characterized in that: the coal pipe is characterized in that a coal pipe sleeve (511) is fixedly arranged on the outer wall of the horizontal coal conveying pipe (58), and a high-alumina refractory castable (512) is fixedly arranged between the coal pipe sleeve (511) and the horizontal coal conveying pipe (58).

9. The steam low-nitrogen combustion system for reducing nitrogen oxide generation in dry cement production according to claim 4, characterized in that: the steam conveying end (1) supplies heat through waste heat of a boiler or a kiln tail of a cement plant, and the coal powder conveying pipeline (4) adopts an original coal powder conveying pipeline of the cement plant.