CN110645588A - Boiler system - Google Patents
Boiler system Download PDFInfo
- Publication number
- CN110645588A CN110645588A CN201810668459.7A CN201810668459A CN110645588A CN 110645588 A CN110645588 A CN 110645588A CN 201810668459 A CN201810668459 A CN 201810668459A CN 110645588 A CN110645588 A CN 110645588A
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- Prior art keywords
- powder
- coal
- storage bin
- boiler
- pipeline
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K1/00—Preparation of lump or pulverulent fuel in readiness for delivery to combustion apparatus
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C21/00—Disintegrating plant with or without drying of the material
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K3/00—Feeding or distributing of lump or pulverulent fuel to combustion apparatus
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Feeding And Controlling Fuel (AREA)
Abstract
The present invention relates to a boiler system. The boiler system comprises a boiler and a powder making unit, wherein the boiler is provided with at least one combustor, the powder making unit comprises at least one coal mill, each separator outlet of each coal mill is connected with at least one powder feeding pipeline leading to the combustor, each separator outlet of each coal mill is further connected with an auxiliary powder pipe, the auxiliary powder pipe is connected with a powder storage bin, a control valve for controlling the on-off of the auxiliary powder pipe pipeline is arranged on the pipeline of the auxiliary powder pipe, the powder storage bin is communicated with each powder feeding pipeline, and a control device for controlling the on-off of the powder storage bin and the powder feeding pipeline is arranged on the pipeline for communicating the powder storage bin with each powder feeding pipeline. When the coal mill normally operates, a certain amount of coal powder is stored in the powder storage bin; when the coal mill trips or is broken, the control device controls the communication between the powder storage bin and the powder feeding pipeline to enable the powder storage bin to start to supply powder, meanwhile, the control valve on the powder feeding pipeline is kept in an open state, the powder feeding pipeline serves as an air channel to blow coal powder to the combustor, and fuel supply of the combustor is maintained, so that fire extinguishment of the boiler is avoided.
Description
Technical Field
The present invention relates to a boiler system.
Background
Thermal power generation is the main force of power development in modern society, and the fuel mainly is coal. In order to improve the efficiency of coal burning, large thermal power plants usually burn pulverized coal, so the coal in the coal hopper is firstly sent to a coal mill to be ground into powder, and then sent to the hearth of the boiler to be burned. As shown in fig. 1, the boiler system includes a boiler 7 and a pulverizing unit including at least one coal mill 2, the boiler 7 having a plurality of burners 14, each coal mill supplying pulverized coal to the plurality of burners. At present, most of coal mills used in thermal power plants are double-inlet and double-outlet coal mills or vertical coal mills. The vertical coal mill has a separator, as shown in fig. 2, the outlet of the separator 6 is connected with a plurality of powder feeding pipelines 4, each powder feeding pipeline leads to a different burner, and each powder feeding pipeline 4 is provided with a control valve 5. The double-inlet and double-outlet coal mill is provided with two separators, as shown in figure 3, the outlet of each separator 6 is connected with a plurality of powder feeding pipelines 4, each powder feeding pipeline at the outlet of the same separator leads to different combustors, and each powder feeding pipeline 4 is provided with a control valve 5. Each coal mill provides pulverized coal for a plurality of combustors through a plurality of powder feeding pipelines, and once the coal mill trips or is broken, the combustor corresponding to the coal mill has the possibility of insufficient fuel supply, even the possibility of fire extinguishing of a hearth is caused, and huge loss is brought.
Disclosure of Invention
The invention aims to provide a boiler system to solve the problem that the fire of a boiler is extinguished due to insufficient fuel supply of a burner when a coal mill is tripped or coal is cut off.
In order to achieve the purpose, the boiler system comprises a boiler and a powder making unit, wherein the boiler is provided with at least one combustor, the powder making unit comprises at least one coal mill, the outlet of each separator of each coal mill is connected with at least one powder feeding pipeline leading to the combustor, the outlet of each separator of each coal mill is also connected with an auxiliary powder pipe, the auxiliary powder pipe is connected with a powder storage bin, a control valve for controlling the communication of the auxiliary powder pipe when the coal powder amount in the powder storage bin is lower than the rated storage amount and controlling the disconnection of the auxiliary powder pipe when the coal powder amount in the powder storage bin reaches the rated storage amount is arranged on the pipeline of the auxiliary powder pipe, the powder storage bin is communicated with each powder feeding pipeline, and a pipeline for communicating the powder storage bin with each powder feeding pipeline is provided with a control device which controls the powder storage bin to be disconnected with the powder feeding pipeline when the powder feeding pipeline is used for normally feeding powder and controls the powder storage bin to be communicated with the powder feeding pipeline when the powder feeding pipeline cannot be used for normally feeding powder. When the coal mill normally operates, the powder feeding pipeline normally supplies powder to each combustor, and a certain amount of coal powder is stored in the powder storage bin; when the coal mill trips or is broken, the control device controls the communication between the powder storage bin and the powder feeding pipeline to enable the powder storage bin to start to supply powder, meanwhile, the control valve on the powder feeding pipeline is kept in an open state, the powder feeding pipeline serves as an air channel to blow coal powder to the combustor, and fuel supply of the combustor is maintained, so that fire extinguishment of the boiler is avoided.
Further, the control device is a control device capable of controlling the flow rate of the pulverized coal. The coal powder flow can be adjusted according to actual needs, the normal coal powder supply of the corresponding burner is maintained, and meanwhile, the coal powder utilization rate is improved.
Preferably, the control device adopts a powder feeder. The powder feeder can control the flow of the pulverized coal more conveniently and reliably.
On the basis of any one of the schemes, a wind powder mixer is arranged at the position where a pipeline for communicating the powder storage bin with the powder feeding pipeline is connected with the powder feeding pipeline. When the coal mill trips or is broken, the primary air blown in by the powder feeding pipeline and the coal powder falling from the powder storage bin are mixed more uniformly by the air-powder mixer before entering the combustor, so that the coal powder is combusted more fully in the combustor, and the utilization rate of the coal powder is improved.
And a newly-added separator for separating air and coal powder is connected between the auxiliary powder pipe and the powder storage bin. The newly-added separator separates the coal dust and the primary air which are sent out by the auxiliary powder pipe, a large amount of coal dust falls into the powder storage bin, and a small amount of fine-particle coal dust is carried by the primary air and is sent to other places.
Furthermore, a dilute phase air pipeline leading to a boiler burnout air layer is connected to an air outlet of the newly-added separator, and a valve for controlling the on-off of the dilute phase air pipeline is arranged on the dilute phase air pipeline. A small amount of fine-grained pulverized coal carried by primary air is fed into a boiler through a dilute phase air pipeline for combustion, so that the utilization rate of the pulverized coal is improved.
The newly-added separator is positioned above the powder storage bin, and the newly-added separator automatically falls into the powder storage bin under the action of the gravity of the pulverized coal.
Drawings
FIG. 1 is a flow chart of a prior art boiler system employing multiple vertical coal mills;
FIG. 2 is a flow chart of the operation of a single vertical coal pulverizer;
FIG. 3 is a flow chart of the operation of a double-in double-out coal pulverizer;
FIG. 4 is a schematic view of an auxiliary powder pipe connected to the coal pulverizer;
in the figure: 1-raw coal hopper; 2-a coal mill; 3-a slag discharging box; 4-powder feeding pipeline; 5-a control valve; 6-a separator; 7-a boiler; 8-auxiliary powder tube; 9-a powder storage bin; 10-adding a separator; 11-air-powder mixer; 12-powder feeder; 13-dilute phase wind pipe; 14-a burner; 15-valve.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings.
The specific embodiment of the boiler system of the invention comprises a boiler and a pulverizing unit, wherein the boiler is provided with at least one burner, the pulverizing unit comprises at least one coal mill, as shown in figure 4, the outlet of a separator 6 of each coal mill 2 is connected with at least one powder feeding pipeline 4 leading to the burner, the outlet of the separator of each coal mill is also connected with an auxiliary powder pipe 8, and the auxiliary powder pipe is connected with a powder storage bin 9. The powder storage bin 9 is provided with a rated storage capacity, and a control valve 5 which controls the auxiliary powder pipe 8 to be communicated when the quantity of the coal powder in the powder storage bin 9 is lower than the rated storage capacity and controls the auxiliary powder pipe 8 to be disconnected when the quantity of the coal powder in the powder storage bin 9 reaches the rated storage capacity is arranged on a pipeline of the auxiliary powder pipe 8. The powder storage bin 9 is communicated with each powder feeding pipeline 4, a powder feeder 12 is arranged on a pipeline which communicates the powder storage bin with each powder feeding pipeline, the powder feeder controls the powder storage bin to be disconnected with the powder feeding pipeline when the powder feeding pipeline normally feeds powder, and the powder feeder controls the powder storage bin to be communicated with the powder feeding pipeline when the powder feeding pipeline cannot normally feed powder. The powder feeder can adjust the flow of the pulverized coal according to actual needs, maintain the normal pulverized coal supply of the corresponding burner and improve the utilization rate of the pulverized coal. A wind powder mixer 11 is arranged at the position where the pipeline for communicating the powder storage bin with the powder feeding pipeline is connected with the powder feeding pipeline. When the coal mill trips or is broken, the primary air blown in by the powder feeding pipeline and the coal powder falling from the powder storage bin are mixed more uniformly by the air-powder mixer before entering the combustor, so that the coal powder is combusted more fully in the combustor, and the utilization rate of the coal powder is improved.
A newly added separator 10 is connected between the auxiliary powder pipe 8 and the powder storage bin 9. The newly-added separator is used for separating the coal powder sent out by the auxiliary powder pipe from the primary air, a dilute phase air pipeline 13 leading to a boiler burnout air layer is connected to an air outlet of the newly-added separator, and a valve 15 for controlling the on-off of the pipeline is arranged on the dilute phase air pipeline. Most of the pulverized coal sent out by the auxiliary powder pipe 8 falls into the powder storage bin 9, and a small amount of fine-particle pulverized coal is carried by primary air and sent into the boiler 7 through a dilute phase air pipeline for combustion, so that the utilization rate of the pulverized coal is improved. The newly added separator 10 is positioned above the powder storage bin 9, and automatically falls into the powder storage bin by utilizing the gravity action of the pulverized coal.
The rated storage capacity of the powder storage bin is set according to actual needs, the requirement that the output of one coal mill is required for a period of time is met, faults of the coal mill are processed or other coal mills are started in the period, and fire extinguishment of a boiler caused by tripping or coal breakage of the coal mill is avoided.
The boiler system also comprises a control unit, a monitoring unit for monitoring the working state of each coal mill and a storage amount detector for detecting the storage amount of the coal powder in the powder storage bin. The monitoring unit and the reserve detector are both in control connection with the control unit. The control valve on each powder feeding pipeline, the control valve on the auxiliary powder pipeline and the powder feeder are also in control connection with the control unit.
When the detection unit detects that a certain coal mill stops supplying coal powder, the detection unit sends a signal to the control unit. The control unit controls the powder feeder corresponding to the corresponding coal mill to be opened according to the received signal, so that the corresponding powder storage bin is used as a new coal powder source to continuously supply coal powder to the combustor, the coal powder is supplied uninterruptedly, and the combustion of the combustor is maintained. And processing the fault of the coal mill in the period of powder supply of the powder storage bin, after the fault is removed, continuously supplying the powder to the combustor by the coal mill, sending a signal to the control unit by the detection unit, and controlling the corresponding powder feeder to be closed by the control unit according to the received signal. Of course, if the coal mill fails, other coal mills can be started. Generally, a large boiler of a thermal power plant is provided with a plurality of coal mills, and the operation number of the coal mills is related to the load of the boiler. At low loads, typically 2 to 3 coal mills are operated, with the mill off standby. If a fault such as a coal break or trip occurs with an operating coal mill, a backup coal mill can be activated to supply fuel to maintain boiler load. Starting a spare coal mill is a relatively complex process, a certain starting time is needed, and in the period before the spare coal mill is started, the powder storage bin can be used as a new coal powder source to continuously supply coal powder to the combustor, so that the situation that the spare coal mill is not started in time to extinguish fire of the boiler is avoided.
When the storage detector detects that the storage amount of the pulverized coal in the powder storage bin is lower than the rated storage amount, the control valve on the auxiliary powder pipe is controlled to be opened, and a part of pulverized coal ground by the coal mill is separated and enters the powder storage bin through the auxiliary powder pipe to be stored; when the storage detector detects that the storage amount of the pulverized coal in the powder storage bin reaches a rated amount, the control valve on the auxiliary powder pipe is controlled to be closed, and the pulverized coal bin stops feeding the pulverized coal.
When the coal mill normally operates, the control valves on the powder feeding pipelines are in an open state, the powder feeding pipelines normally supply powder to the burners, meanwhile, the control valves on the auxiliary powder pipe pipelines are opened to store a certain amount of coal powder into the powder storage bin, and the control valves are closed after the coal powder storage amount reaches a rated storage amount; when the coal mill trips or is broken, the powder feeder is started to supply powder, meanwhile, the control valves on the powder feeding pipelines are still kept in an open state, the powder feeding pipelines serve as air channels to blow the pulverized coal falling from the powder storage bin to the burner, and the fuel supply of the burner is maintained, so that fire extinguishment of the boiler can be avoided.
During the deep peak regulation period, the boiler system can be used for improving the concentration of the coal powder of the corresponding operating combustor, reducing the ignition heat and improving the combustion stability.
In addition, it should be added that, the coal mill used in the boiler system, whether it is a vertical coal mill as shown in fig. 2 or a double-inlet and double-outlet coal mill as shown in fig. 3, can achieve the purpose of continuously supplying pulverized coal to the burner when the coal mill is tripped or broken, so as to avoid fire extinguishing of the boiler.
In the above embodiments, the pulverized coal flow rate is controlled by the powder feeder, and in other embodiments, a regulating valve may also be used. Of course, a shut-off valve can be adopted, but the shut-off valve only can control the connection or disconnection of the powder storage bin and the powder feeding pipeline and cannot control the flow of the pulverized coal.
In the above embodiment, the newly-added separator is located above the powder storage bin, so that the coal powder can fall into the powder storage bin more conveniently by using the gravity of the coal powder. Of course, the new separator can be arranged at other positions, such as below the powder storage bin, and the pulverized coal is pumped into the powder storage bin through a pump.
Claims (7)
1. A boiler system comprises a boiler and a powder making unit, wherein the boiler is provided with at least one combustor, the powder making unit comprises at least one coal mill, and the outlet of each separator of each coal mill is connected with at least one powder feeding pipeline leading to the combustor.
2. The boiler system according to claim 1, wherein the control device is a control device capable of controlling a flow rate of pulverized coal.
3. The boiler system according to claim 2, wherein the control device is a powder feeder.
4. The boiler system according to any one of claims 1 to 3, wherein a duct connecting the powder storage bin and the powder feeding duct is provided with a wind-powder mixer.
5. The boiler system according to any one of claims 1 to 3, wherein a newly added separator for separating wind from pulverized coal is connected between the auxiliary powder pipe and the powder storage bin.
6. The boiler system as set forth in claim 5, wherein the air outlet of the new separator is connected with a dilute phase air pipeline leading to the over-fired air layer of the boiler, and the dilute phase air pipeline is provided with a valve for controlling the on-off of the dilute phase air pipeline.
7. The boiler system according to claim 5, wherein the fresh separator is located above the hopper.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810668459.7A CN110645588A (en) | 2018-06-26 | 2018-06-26 | Boiler system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810668459.7A CN110645588A (en) | 2018-06-26 | 2018-06-26 | Boiler system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110645588A true CN110645588A (en) | 2020-01-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810668459.7A Pending CN110645588A (en) | 2018-06-26 | 2018-06-26 | Boiler system |
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| Country | Link |
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| CN (1) | CN110645588A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114110641A (en) * | 2021-11-19 | 2022-03-01 | 山东日照发电有限公司 | Coal mill outlet powder pipe purging device and coal mill combustor stopping control method |
-
2018
- 2018-06-26 CN CN201810668459.7A patent/CN110645588A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114110641A (en) * | 2021-11-19 | 2022-03-01 | 山东日照发电有限公司 | Coal mill outlet powder pipe purging device and coal mill combustor stopping control method |
| CN114110641B (en) * | 2021-11-19 | 2024-01-16 | 山东日照发电有限公司 | Coal mill outlet powder pipe purging device and coal mill combustor start-stop control method |
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