CN214147977U - System for controlling W flame boiler double-inlet and double-outlet steel ball-milling bituminous coal blending combustion proportion - Google Patents
System for controlling W flame boiler double-inlet and double-outlet steel ball-milling bituminous coal blending combustion proportion Download PDFInfo
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- CN214147977U CN214147977U CN202022978346.2U CN202022978346U CN214147977U CN 214147977 U CN214147977 U CN 214147977U CN 202022978346 U CN202022978346 U CN 202022978346U CN 214147977 U CN214147977 U CN 214147977U
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Abstract
The utility model provides a temperature-adjusting flue gas regulation and control W flame boiler double-inlet and double-outlet steel ball-milling bituminous coal blending combustion proportion system, which comprises a flue gas recirculation high-pressure fan and a heat exchange device, wherein a flue gas outlet of each dust remover on the W flame boiler is connected with an air inlet of the flue gas recirculation high-pressure fan; the gas outlet of the furnace smoke recycling high-pressure fan is connected with the gas inlet of the heat exchange device; the air outlet of the heat exchange device is connected to a grinding hot air inlet main pipe connected with a hot air inlet of the coal mill; the method can improve the explosion-proof performance of the coal mill, and can reduce the oxygen concentration in the primary air-powder airflow so as to reduce the concentration of NOx at the outlet of the hearth; meanwhile, after the method adopts the boiler smoke recirculation, the temperatures of the main and reheating steam of the boiler under the low-load working condition can be obviously improved.
Description
Technical Field
The utility model belongs to the technical field of coal-fired thermal power generating unit coal type enlargeability and adaptability transformation, especially, relate to a flue gas regulation and control W flame boiler that adjusts temperature advances two steel ball-milling bituminous coal blending proportion system that go out.
The utility model provides a can adjust temperature flue gas and converge in malleation primary hot-blast, can adjust the flow and the temperature of extraction flue gas according to the change of coal pulverizer export temperature and oxygen volume in the operation, reach the purpose of control W flame boiler double-in double-out steel ball-milling bituminous coal blending combustion proportion, belong to.
Background
The W flame boiler is a main boiler type for burning low-volatile coal in China, the minimum oil-throwing-free stable combustion load of the general W flame boiler can only reach about 50% of the rated output of the boiler, meanwhile, the W flame boiler cannot realize deep peak regulation, and steam-water parameters under the low-load operation working condition do not reach the standard. In order to improve the requirements of low-load stable combustion capacity and deep peak regulation of the boiler, part of W flame boilers need to mix high-volatile bituminous coal, and the safety and the economical efficiency of a pulverizing system need to be considered in the operation process.
Disclosure of Invention
An object of the utility model is to provide a control W flame boiler advances two steel ball-milling bituminous coal and mixes burning proportional system doubly, has solved the above-mentioned technical problem that current W flame boiler exists.
In order to achieve the above purpose, the utility model discloses a technical scheme is:
the utility model provides a temperature-adjusting flue gas regulation and control W flame boiler double-inlet and double-outlet steel ball-milling bituminous coal blending combustion proportion system, which comprises a flue gas recirculation high-pressure fan and a heat exchange device, wherein a flue gas outlet of each dust remover on the W flame boiler is connected with an air inlet of the flue gas recirculation high-pressure fan; the gas outlet of the furnace smoke recycling high-pressure fan is connected with the gas inlet of the heat exchange device; and the air outlet of the heat exchange device is connected with a grinding hot air main pipe connected with a hot air inlet of the coal mill.
Preferably, a furnace smoke pipeline inlet electric stop door is arranged on a connecting pipeline between a smoke outlet of the dust remover and the furnace smoke recirculation high-pressure fan.
Preferably, an electric adjusting door for the outlet of the furnace smoke pipeline is arranged on a connecting pipeline between the furnace smoke recirculation high-pressure fan and the heat exchange device.
Preferably, an electric stop door at the outlet of the furnace smoke pipeline is arranged between the air outlet of the heat exchange device and the grinding hot air inlet main pipe.
Preferably, a furnace smoke pipeline outlet communicating pipe is arranged between the air outlets of the plurality of furnace smoke recycling high-pressure fans.
Preferably, a plurality of air outlets of the grinding hot air main pipes are connected with a hot air main pipe, a plurality of air outlets are arranged on the hot air main pipe, and each air outlet is connected with one coal mill.
Preferably, an oxygen measuring point is arranged at the air inlet of each coal mill.
Preferably, a temperature measuring point is arranged at the air outlet of each coal mill.
Compared with the prior art, the beneficial effects of the utility model are that:
the utility model provides a control W flame boiler double entry double exit steel ball-milling bituminous coal mixes burns proportion system, through taking out the low temperature low dust flue gas of W flame boiler dust remover export and sending into the wind-heat air main pipe of the primary air through the high pressure positive blower of stove smoke recirculation and hot-blast mixing back and entering double entry double exit steel ball-milling as dry medium, the method can not only improve the explosion-proof performance of coal pulverizer, can also reduce the oxygen concentration in the wind-heat air current, and then reduce the concentration of furnace export NOx; meanwhile, after the method adopts the boiler smoke recirculation, the temperature of main and reheat steam of the boiler under the low-load working condition can be obviously improved;
furthermore, in the running process of the system, according to the numerical values of the oxygen amount measuring point and the smoke temperature measuring point, the extraction flow and the temperature of the low-temperature low-dust furnace smoke can be respectively adjusted, so that the blending combustion proportion of the W-flame boiler double-inlet double-outlet steel ball-milled bituminous coal is controlled.
To sum up, the utility model discloses well system equipment has had comparatively ripe technology, is applicable to W flame boiler double-in and double-out steel ball-milling and mixes regulation and control of burning proportion to soft coal.
Drawings
Fig. 1 is a schematic diagram of the system structure of the present invention.
Detailed Description
To further illustrate the technical means and effects of the present invention adopted to achieve the intended purpose of the present invention, the following detailed description of the present invention will be given with reference to the accompanying drawings.
As shown in FIG. 1, the utility model provides a control W flame boiler double-inlet and double-outlet steel ball-milling bituminous coal blending combustion proportion system, including first side stove smoke recirculation high pressure positive blower 1, second side stove smoke recirculation high pressure positive blower 2, first side stove smoke pipeline inlet electric stop gate 3, second side stove smoke pipeline inlet electric stop gate 4, first side stove smoke pipeline outlet electric regulating gate 5, second side stove smoke pipeline outlet electric regulating gate 6, first side stove smoke pipeline outlet heat exchange device 7, second side stove smoke pipeline outlet heat exchange device 8, first side stove smoke pipeline outlet electric stop gate 9, second side stove smoke pipeline outlet electric stop gate 10, A coal mill inlet measuring point 11, B coal mill inlet oxygen amount measuring point 12, C coal mill inlet oxygen amount measuring point 13, D coal mill inlet oxygen amount measuring point 14, A coal mill outlet temperature measuring point 15, B coal mill outlet temperature oxygen amount 16, B coal mill outlet temperature oxygen amount measuring point 11, B coal mill inlet oxygen amount measuring point 12, D coal mill oxygen amount measuring point 14, B coal mill outlet temperature measuring point 14, B coal mill, C coal pulverizer outlet temperature measuring point 17, D coal pulverizer outlet temperature measuring point 18, first second furnace smoke pipeline outlet communicating pipe 19, first side furnace smoke conveying pipeline 20, second side furnace smoke conveying pipeline 21, first side dust remover 22, second side dust remover 23, first side air preheater 24, second side air preheater 25, first side grinding hot air main pipe 26 and second side grinding hot air main pipe 27, wherein the air outlet of first side dust remover 22 is connected with the air inlet of first side furnace smoke recirculation high pressure positive blower 1 through a pipeline, and the pipeline is provided with first side furnace smoke pipeline inlet electric stop door 3.
The air outlet of the first-side flue gas recirculation high-pressure fan 1 is connected with the air inlet of the first-side flue gas pipeline outlet heat exchange device 7 through a first-side flue gas conveying pipeline 20, and an electric regulating door 5 for the first-side flue gas pipeline outlet is arranged on the first-side flue gas conveying pipeline 20.
The air outlet of the first side furnace smoke pipeline outlet heat exchange device 7 is connected with a first side grinding hot air main pipe 26 through an electric stop door 9 at the first side furnace smoke pipeline outlet.
The air outlet of the second-side dust remover 23 is connected with the air inlet of the second-side furnace smoke recycling high-pressure fan 2 through the second-side furnace smoke pipeline inlet electric stop door 4; an air outlet of the second-side furnace smoke recycling high-pressure fan 2 is connected with an air inlet of the second-side furnace smoke pipeline outlet heat exchange device 8 through a second-side furnace smoke conveying pipeline 21, and an electric adjusting door 6 for the second-side furnace smoke pipeline outlet is arranged on the second-side furnace smoke conveying pipeline 21.
The air outlet of the second side furnace smoke pipeline outlet heat exchange device 8 is connected with the air inlet of a second side grinding hot air main pipe 27 through a second side furnace smoke pipeline outlet electric stop door 10.
The air outlets of the first side grinding hot air inlet main pipe 26 and the second side grinding hot air inlet main pipe 27 are connected with the air inlet of the main pipe; the main pipe is provided with a plurality of air outlets, and each air outlet is connected with a coal mill through a pipeline.
An oxygen amount measuring point is arranged at the air inlet of each coal mill 28; and a temperature measuring point is arranged at the air outlet of each coal mill.
The heat exchange device at the outlet of the furnace smoke pipeline can be a heating furnace.
The utility model discloses a working process:
the first-side low-temperature low-dust furnace smoke is extracted from an outlet extraction point of a first-side dust remover 22, enters a first-side furnace smoke recirculation high-pressure fan 1 through a first-side furnace smoke pipeline inlet electric stop door 3 to be pressurized, the pressurized smoke is conveyed to a first-side furnace smoke pipeline outlet heat exchange device 7 through a first-side furnace smoke conveying pipeline 20 to be heated, and then the heated smoke enters a first-side hot air grinding main pipe 26 to be mixed with primary air hot air extracted from a first-side preheater to serve as a drying medium to enter a coal mill 28;
second-side low-temperature low-dust furnace flue gas enters a second-side furnace flue gas recirculation high-pressure fan 2 through a second-side furnace flue gas pipeline inlet electric stop door 4 for pressurization treatment after being extracted from a second-side dust remover 23 outlet, the pressurized flue gas is conveyed to a second-side furnace flue gas pipeline outlet heat exchange device 8 through a second-side furnace flue gas conveying pipeline 21 for heating, and then the heated flue gas enters a second-side hot air grinding main pipe 27 to be mixed with primary hot air extracted from a second-side air preheater to serve as a drying medium to enter a coal mill 28.
A furnace smoke pipeline outlet communicating pipe 19 is arranged between the furnace smoke conveying pipeline 20 at the first side and the furnace smoke conveying pipeline 21 at the second side, when the single-side furnace smoke recirculation high-pressure fan 1 or the furnace smoke recirculation high-pressure fan 2 at the second side breaks down and trips, the furnace smoke at the normal side can be converged into a heat exchange device at the other side through the furnace smoke pipeline outlet communicating pipe 19 at the first side to be heated, and therefore drying media entering each coal mill are uniform.
In the operation of the system, acquiring flue gas flow entering each coal mill in real time according to an A coal mill inlet oxygen amount measuring point 11, a B coal mill inlet oxygen amount measuring point 12, a C coal mill inlet oxygen amount measuring point 13 and a D coal mill inlet oxygen amount measuring point 14, comparing the acquired flue gas flow with a preset threshold value, and controlling the rotating speed of a furnace smoke recycling high-pressure fan according to the comparison result;
the method comprises the steps of collecting the temperature of flue gas entering each coal mill in real time according to a coal mill outlet temperature measuring point A15, a coal mill outlet temperature measuring point B16, a coal mill outlet temperature measuring point C17 and a coal mill outlet temperature measuring point D18, comparing the collected temperature of the flue gas with a preset threshold, controlling the input power of a heat exchange device according to the comparison result, and further controlling the blending proportion of the W-flame boiler double-inlet double-outlet steel ball-milled bituminous coal.
Specifically, flue gas flow regulation is to regulate the frequency converters of the furnace flue gas recirculation high-pressure fans on the two sides A and B respectively;
the flue gas temperature regulation is respectively carried out by regulating the heat exchange devices at the furnace flue pipe outlets on the first side and the second side.
In addition, low-temperature low-dust furnace smoke as inert gas is merged with primary air and then enters the hearth, so that the oxygen concentration in the pulverized coal airflow at the initial stage of combustion can be reduced, the concentration of NOx generated by combustion at the outlet of the hearth is obviously reduced, and meanwhile, after smoke recirculation is adopted, the temperature of main and reheating steam of the boiler under low load is obviously improved.
Claims (8)
1. A system for controlling the proportion of mixed burning of W flame boiler double-inlet and double-outlet steel ball-milled bituminous coal is characterized by comprising a smoke recycling high-pressure fan and a heat exchange device, wherein a smoke outlet of each dust remover on the W flame boiler is connected with an air inlet of the smoke recycling high-pressure fan; the gas outlet of the furnace smoke recycling high-pressure fan is connected with the gas inlet of the heat exchange device; and the air outlet of the heat exchange device is connected with a grinding hot air main pipe connected with a hot air inlet of the coal mill.
2. The system for controlling the proportion of mixed-burning bituminous coal in a W-flame boiler by means of the double-inlet and double-outlet steel ball mill as claimed in claim 1, wherein a flue gas pipe inlet electric stop door is arranged on a connecting pipeline between a flue gas outlet of the dust remover and the flue gas recirculation high-pressure fan.
3. The system for controlling the W-flame boiler double-inlet and double-outlet steel ball-milling bituminous coal blending combustion proportion as claimed in claim 1, wherein a furnace smoke pipeline outlet electric adjusting door is arranged on a connecting pipeline between the furnace smoke recirculation high-pressure fan and the heat exchange device.
4. The system for controlling the W-flame boiler double-inlet and double-outlet steel ball-milling bituminous coal co-combustion proportion as claimed in claim 1, wherein an electric cut-off door at the outlet of the furnace flue pipe is arranged between the outlet of the heat exchange device and the grinding hot air main pipe.
5. The system for controlling the W-flame boiler double-inlet and double-outlet steel ball-milling bituminous coal blending combustion proportion as claimed in claim 1, wherein a flue gas pipeline outlet communicating pipe is arranged between the gas outlets of the plurality of flue gas recirculation high-pressure fans.
6. The system for controlling the proportion of mixed-burning bituminous coal in a W-flame boiler by double-inlet and double-outlet steel ball milling as claimed in claim 1, wherein a hot air main pipe is connected to the air outlets of a plurality of grinding hot air main pipes, a plurality of air outlets are arranged on the hot air main pipe, and each air outlet is connected with a coal mill.
7. The system for controlling the proportion of blended bituminous coal in a W-flame boiler with double-inlet and double-outlet steel ball milling as claimed in claim 1, wherein an oxygen measurement point is arranged at an air inlet of each coal mill.
8. The system for controlling the proportion of bituminous coal mixed with steel ball milling of the W-flame boiler in the double-inlet and double-outlet manner as claimed in claim 1, wherein a temperature measuring point is arranged at an air outlet of each coal mill.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022978346.2U CN214147977U (en) | 2020-12-10 | 2020-12-10 | System for controlling W flame boiler double-inlet and double-outlet steel ball-milling bituminous coal blending combustion proportion |
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| CN202022978346.2U CN214147977U (en) | 2020-12-10 | 2020-12-10 | System for controlling W flame boiler double-inlet and double-outlet steel ball-milling bituminous coal blending combustion proportion |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112555884A (en) * | 2020-12-10 | 2021-03-26 | 西安西热锅炉环保工程有限公司 | System and method for controlling W flame boiler double-inlet double-outlet steel ball-milling bituminous coal blending combustion proportion |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112555884A (en) * | 2020-12-10 | 2021-03-26 | 西安西热锅炉环保工程有限公司 | System and method for controlling W flame boiler double-inlet double-outlet steel ball-milling bituminous coal blending combustion proportion |
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