CN115325531A - Deep peak-regulation low-load stable combustion method for medium-speed grinding four-corner tangential boiler - Google Patents
Deep peak-regulation low-load stable combustion method for medium-speed grinding four-corner tangential boiler Download PDFInfo
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- 238000002485 combustion reaction Methods 0.000 claims abstract description 60
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C5/00—Disposition of burners with respect to the combustion chamber or to one another; Mounting of burners in combustion apparatus
- F23C5/08—Disposition of burners
- F23C5/32—Disposition of burners to obtain rotating flames, i.e. flames moving helically or spirally
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C7/00—Combustion apparatus characterised by arrangements for air supply
-
- 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
- F23K3/02—Pneumatic feeding arrangements, i.e. by air blast
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Combustion Of Fluid Fuel (AREA)
Abstract
The invention relates to the technical field of burner equipment of a power plant, in particular to a deep peak regulation low-load stable combustion method for a medium-speed grinding four-corner tangential boiler, which comprises a main burner and an auxiliary burner, wherein the main burner adopts a plurality of layers of burners, the uppermost burner delivers bituminous coal, and the lower burner delivers lean coal; the auxiliary burner is arranged below the main burner; and leading a part of bituminous coal airflow at the inlet end of the burner at the uppermost layer to the auxiliary burner to form a stable combustion combination mode of two layers of bituminous coal airflow with middle lean coal airflow. The arrangement and combustion supporting mode provided by the invention greatly improves the single-corner and same-layer combustion temperature, improves the overall combustion environment of the hearth under low load, and reduces the problem of unstable combustion. Meanwhile, the concentration of the pulverized coal is adjusted by adjusting the amount of the coal entering into the mill and the primary air quantity, the requirements of different peak load regulation loads and coal quality are met, and the method has high flexibility and operability.
Description
Technical Field
The invention relates to the technical field of burner equipment of a power plant, in particular to a deep peak-regulation low-load combustion stabilizing method for a medium-speed grinding four-corner tangential boiler.
Background
Due to the rapid development of new energy power generation and the surplus of coal electricity production capacity in China, the flexible modification of coal electricity is imperative. When the proportion of new energy in a power grid is gradually enlarged, the demand on a peak shaving power supply is gradually increased, and compared with power supplies such as new energy, the coal-electricity peak shaving performance is better. For countries using coal as the main primary energy source, highly regulated coal power plants are the most practical and feasible choices.
In order to improve economic benefit and prevent coking and high-temperature corrosion, the operation of the prior tangential boiler with four corners of a medium-speed milling powder preparation system is usually carried out by adopting a mode of blending and burning coal types (bituminous coal and lean coal). The conventional low-load modification modes comprise a combustion stabilizing technology of oxygen-enriched combustor fault or staggered layer arrangement, a single-channel controllable thermal reflux deflection pre-combustion chamber combustor, a dense-dilute separation double-nozzle combustor, a plasma ignition depth peak-regulation combustion stabilizing technology and the like.
(1) The combustor is arranged in a fault or a staggered layer for stable combustion: the combustion of the pulverized coal and fuel oil is enhanced by using oxygen (local small amount of oxygen is added in a combustor), the ignition temperature of the fuel is reduced, the temperature in the combustion process is improved, the reaction speed is accelerated, the pulverized coal enters a hearth in an advanced active combustion state and is not influenced by coal quality and temperature fluctuation of the surrounding hearth, the temperature of the hearth is improved, the pulverized coal of the whole boiler cannot be flamed out due to unstable combustion caused by too low thermal load of the hearth, the ultra-low load (minimum 20% rated load) peak regulation without stopping the boiler of the boiler is realized, and the deep peak regulation capability of a thermal power generating unit is enhanced. The disadvantages are that: oil and oxygen are fed for a long time to support combustion at low load, so that the economic benefit of a unit is influenced; the risk of local coking exists in the combustor when oil is thrown for a long time.
(2) Single-channel controllable hot reflux deflection pre-combustion chamber burner: the centrifugal force of the last elbow of the primary air pipe in the direction of the hearth is utilized to divide the pulverized coal airflow in the pipe into two pulverized coal airflows, the two pulverized coal airflows pass through a dense-dilute distributor and then enter a vertically-arranged underpants pipe, the upper pipe is provided with a dilute pulverized coal airflow, and the lower pipe is provided with a concentrated pulverized coal airflow; the concentrated coal dust airflow in the lower pipe enters the precombustion chamber through an inlet below the rectangular (circular) precombustion chamber and then enters the hearth from an outlet of the precombustion chamber. When the rich coal powder air flow passes through the bottom of the precombustion chamber at the speed of 23-26m/s, a negative pressure zone is formed in the precombustion chamber, so that strong hot flue gas backflow is caused, and the burner has quite good stable combustion capability. The disadvantages are that: the soft coal machine is suitable for a soft coal machine set, long-time arc striking is needed in low load, the cathode head is frequently replaced, the power consumption is high, the replacement cost is high, and the economic benefit of the machine set is influenced; the risk of local coking exists in the combustor due to long-time oil feeding; insensitive to load response and frequent arc interruption.
(3) Dense-dilute separation double-nozzle combustor: adopts horizontal left-right thick-thin combustion, and tangential combustion mode boilers are arranged at four corners of a combustor. Utilize the dog to separate into dense and thin two strands with the buggy air current, the spout sets up separation baffle, leads dense buggy to the side of facing a fire, and light buggy flows at the side of being shaded from a fire, carries out dense and thin separation burning. The disadvantages are that: the coal is suitable for single adaptation and is suitable for lean coal; the minimum stable combustion load can be realized at 40-70% without oil feeding and stable combustion by BMCR, the temperature of a hearth is reduced when the load is lower, the temperature of the entrainment high-temperature flue gas is reduced, and further stable combustion is limited; the high load operation has coking risk.
(4) A bluff body burner: after the primary air-powder gas winds the bluff body, due to the difference of the inertia of the air powder, the dense coal powder area is arranged on the fire side, and the dense coal powder area is just an oxygen-rich area with higher smoke temperature, so that the advanced ignition and intensified combustion of the coal powder are greatly facilitated, and the combustion efficiency is improved. The disadvantages are that: the coal type is suitable for single coal and is suitable for lean coal and anthracite, the minimum fuel input-free stable combustion load of the lean coal is 70 percent of BMCR; the concentration and the light proportion of the primary air powder are not adjustable, and the requirement of adjusting the concentration of the primary air powder according to the load and the coal quality change cannot be realized; the deep peak-shaving low-load concentration-dilution separation technology is stable in combustion, the primary wind speed and the output of a coal mill are low, the concentration-dilution ratio of primary wind powder is greatly deviated from a design value, the stable combustion effect is not obvious, and the risk of pipe blockage, nozzle burning and coking exists on the contrary; when the soft coal, the poor soft coal and the brown coal are stably combusted by adopting a thick-thin separation technology, the high load has the risks of coking and high-temperature corrosion.
The modification modes do not meet the specific requirements of flexible modification on deep peak regulation and low-load stable combustion and the coal burning characteristic of a tangential boiler of four corners of a medium-speed mill pulverizing system.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a deep peak regulation low-load stable combustion method for a medium-speed grinding four-corner tangential boiler, which solves the defects and problems in the flexible transformation of the deep peak regulation low-load of the medium-speed grinding powder preparation system four-corner tangential boiler.
In order to realize the purpose, the technical scheme provided by the invention is as follows:
a deep peak-regulation low-load stable combustion method for a medium-speed grinding four-corner tangential boiler comprises a main combustor and an auxiliary combustor, wherein the main combustor adopts a plurality of layers of combustors, the uppermost combustor delivers soft coal, and the lower combustor delivers lean coal; the auxiliary burner is arranged below the main burner; and leading a part of bituminous coal airflow at the inlet end of the uppermost layer of the combustor to the auxiliary combustor to form a stable combustion combination mode of two layers of bituminous coal airflow bags with the middle lean coal airflow.
The main burner is specifically arranged into two layers.
The medium-speed mill comprises an upper medium-speed mill for providing soft coal and a lower medium-speed mill for providing lean coal; the main burner comprises an upper layer burner and a lower layer burner; the upper-layer combustor is connected with the upper-layer medium-speed mill through an upper-layer pulverized coal pipe, and the lower-layer combustor is connected with the lower-layer medium-speed mill through a lower-layer pulverized coal pipe; and the auxiliary burner is connected with the upper-layer medium-speed mill through an auxiliary pulverized coal pipe.
As a further optimized technical scheme, the auxiliary burner adopts a torch burner; with a vortex chamber.
As a further optimized technical scheme, the coal powder separator also comprises a coal powder separator, wherein the inlet end of the coal powder separator is connected with the upper-layer medium-speed mill through a coal powder pipeline, one path of the outlet end of the coal powder separator is connected with the upper-layer burner through an upper-layer coal powder pipe, and the other path of the outlet end of the coal powder separator is connected with the auxiliary burner through an auxiliary coal powder pipe.
As a further optimized technical scheme, the pulverized coal pipeline is provided with a shutoff valve and an adjustable shrinkage cavity.
As a further optimized technical scheme, an adjusting baffle is arranged in the pulverized coal flow divider and used for adjusting the air quantity and the coal quantity entering the upper layer combustor or the auxiliary combustor.
As a further optimized technical scheme, the upper coal powder pipe is sequentially provided with a first air inlet connecting pipe, a first throttling piece and an upper coal powder pipe flowmeter.
As a further optimized technical scheme, the auxiliary pulverized coal pipe is sequentially provided with a first cut-off valve, a third air inlet pipe, a third throttling element and an auxiliary pulverized coal pipe flowmeter.
As a further optimized technical scheme, the lower coal powder pipe is sequentially provided with a second stop valve, a second air inlet connecting pipe, a second throttling element and a lower coal powder pipe flowmeter.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a deep peak regulation low-load stable combustion method for a medium-speed grinding four-corner tangential boiler, which forms a low-coal-flow stable combustion combination mode with two layers of bituminous coal airflow sandwiched between two layers of bituminous coal airflow through a burner at the uppermost layer and an auxiliary burner; meanwhile, the auxiliary burner generates a stable high-temperature torch to support combustion of the lower burner, and stable ignition heat is provided for pulverized coal ignition. The arrangement and combustion supporting mode provided by the invention greatly improves the single-angle and same-layer combustion temperature, improves the overall combustion environment of the hearth under low load, and reduces the problem of unstable combustion brought. Meanwhile, the concentration of the pulverized coal is adjusted by adjusting the amount of the coal entering into the mill and the primary air quantity, the requirements of different peak load regulation loads and coal quality are met, and the method has high flexibility and operability.
The invention does not need to input combustion-supporting media such as fuel oil, oxygen and the like except the pulverized coal in the long-time stable combustion process, can ensure continuous stability and realizes the economy of low-load stable combustion operation. The flexible operation characteristic is achieved, and adjustment can be made according to the combustion working conditions such as boiler load and coal quality. The deep peak-shaving low-load technology is used, and the normal combustion mode is switched back to when the load is medium or high. Meanwhile, the primary wind speed and the wind-coal ratio can be adjusted on line. The coal pulverizing system has good matching performance with a medium-speed grinding system, and meets the coal matching requirement of the coal pulverizing system and the working characteristics of the medium-speed grinding. The method has quick response and load change stability, and can realize AGC mode deep peak regulation.
The method solves the problem of the flexible transformation of the deep peak-regulation low-load stable combustion of the medium-speed mill four-corner tangential boiler, provides a technical route for the deep peak-regulation low-load stable combustion of the medium-speed mill four-corner tangential boiler of a powder making system in future, and has high scientific research value and popularization value of the same type of units. The successful development of deep peak regulation, low load and stable combustion of the coal-fired unit and the large-scale utilization of clean energy power generation realize good complementary effect, and have very high economic benefit and environmental protection benefit.
Drawings
FIG. 1 is a schematic view of a deep peak-shaving low-load combustion stabilizing system for a medium-speed grinding four-corner tangential boiler according to an embodiment of the present invention;
FIG. 2 is a schematic plan layout view of a deep peak-shaving low-load combustion stabilizing system for a medium-speed grinding four-corner tangential boiler according to an embodiment of the invention;
FIG. 3 is a schematic view of the internal structure of the coal dust splitter according to the present invention.
In the figure, 100, the upper burner; 110. an upper pulverized coal pipe; 120. a pulverized coal splitter; 121. A first adjusting baffle; 122. a second adjusting baffle; 130. a first orifice member; 140. a first air inlet connecting pipe; 150. an upper pulverized coal pipe flowmeter;
200. an auxiliary burner; 210. an auxiliary pulverized coal pipe; 220. a first shut-off valve; 230. an auxiliary powder tube flow meter; 240. a third air inlet connecting pipe; 250. a third throttling element;
300. a lower layer burner; 310. a lower pulverized coal pipe; 320. a second shut-off valve; 330. a second air inlet connecting pipe; 340. a second orifice member; 350. a lower pulverized coal pipe flowmeter;
400. grinding the upper layer at a medium speed; 401. a pulverized coal pipeline; 402. the gate is turned off; 403. adjustable shrinkage cavity; 410. and the lower layer is milled at medium speed.
Detailed Description
The following detailed description of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
In the description of the present application, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be construed as limiting the present application.
The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, the meaning of "a plurality" is two or more unless otherwise specified.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; 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 application can be understood in a specific case by those of ordinary skill in the art.
As shown in fig. 1-2, a deep peak-regulation low-load stable combustion method for a medium-speed grinding tetragonal tangential boiler according to a preferred embodiment of the present invention comprises a main burner and an auxiliary burner 200, wherein the main burner adopts a plurality of burners, wherein the uppermost burner 100 operates bituminous coal, and the lower burner 300 operates lean coal; the auxiliary burner 200 is arranged below the main burner; and leading a part of bituminous coal airflow at the inlet end of the burner at the uppermost layer to the auxiliary burner 200 to form a stable combustion combination mode of two layers of bituminous coal airflow with middle lean coal airflow. A part of bituminous coal airflow of the upper layer combustor 100 is guided to an auxiliary combustor 200 by utilizing the combustible characteristic of bituminous coal, and the auxiliary combustor 200 is arranged below the lower layer combustor 300 to form a combined mode of two layers of bituminous coal airflow sandwiching middle lean coal airflow stable combustion. Meanwhile, the auxiliary burner 200 generates a stable high-temperature torch to support combustion of the lower burner 300, thereby providing stable ignition heat for pulverized coal ignition. The arrangement and combustion supporting mode greatly improves the single-angle and same-layer combustion temperature, improves the whole combustion environment of the hearth under low load, and reduces the problem of unstable combustion brought. Meanwhile, the concentration of the pulverized coal is adjusted by adjusting the coal feeding amount and the primary air volume, so that the requirements of different peak load regulation loads and coal quality are met, and the device has high flexibility and operability. In this embodiment, the upper burner 100 and the lower burner 300 are original boiler devices, and the auxiliary pulverized coal burner is a new device.
In some embodiments of the present application, the main burners are specifically arranged in two layers. In this embodiment, the upper burner 100 operates bituminous coal, and the lower burner 300 operates lean coal.
In some embodiments of the present application, the method further comprises a medium-speed mill, wherein the medium-speed mill comprises an upper layer medium-speed mill 400 and a lower layer medium-speed mill 410; in this embodiment, the upper medium-speed mill 400 is used to provide bituminous coal for the main burner and the auxiliary burner 200 to supply powder, so as to ensure a stable combustion torch; the lower medium-speed mill 410 is used for providing lean coal, the output of the lean coal can be adjusted, and the AGC command of quick response of unit load is met. The main burner comprises an upper burner 100 and a lower burner 300; the upper burner 100 is connected with the upper medium-speed mill 400 through an upper pulverized coal pipe 110, and the lower burner 300 is connected with the lower medium-speed mill 410 through a lower pulverized coal pipe 310; the auxiliary burner 200 is connected to the upper medium-speed mill 400 through an auxiliary pulverized coal pipe 210. In this embodiment, the pulverized coal pipeline 401 is provided with a shutoff door 402 and an adjustable shrinkage cavity 403, wherein the adjustable shrinkage cavity is used for adjusting the balance of the pulverized coal air pressure in the pipeline, so as to ensure the combustion stability of the boiler.
In some embodiments of the present application, the auxiliary burner 200 employs a flare burner; with a vortex chamber. The lower burner 300 is combured by the high temperature flare nozzle of the auxiliary burner 200.
In some embodiments of the present application, the coal powder splitter 120 is further included, an inlet end of the coal powder splitter 120 is connected to the upper middle speed mill 400 through a coal powder pipeline 401, one path of an outlet end of the coal powder splitter is connected to the upper burner 100 through an upper coal powder pipe 110, and the other path of the outlet end of the coal powder splitter is connected to the auxiliary burner 200 through an auxiliary coal powder pipe 210.
In some embodiments of the present application, an adjusting baffle is disposed in the pulverized coal splitter 120 for adjusting the air flow and the coal amount entering the upper burner 100 or the auxiliary burner 200. As shown in fig. 3, a first adjusting baffle 121 and a second adjusting baffle 122 are arranged in the pulverized coal splitter 120, and the air-powder mixture entering the pulverized coal distributor is distributed according to a predetermined ratio through the adjustment of the first adjusting baffle 121 and the second adjusting baffle 122; the first adjusting baffle 121 can adjust the air quantity of the outlet pipe, and the second adjusting baffle 122 can adjust the powder quantity of the outlet pipe. In this embodiment, a curved pipe section, a straight pipe section and a split-flow section pipeline are sequentially arranged from upstream to downstream inside the pulverized coal splitter 120, the pulverized coal is sent into the curved pipe section of the pulverized coal splitter 120 by the upper intermediate speed mill 400, is split by the first adjusting baffle 121 and enters the straight pipe section, is further split by the second adjusting baffle 122, and enters the split-flow section and then flows into the upper burner 100 and the auxiliary burner 200 respectively.
In some embodiments of the present application, the upper coal powder pipe 110 is provided with a first throttling member 130 for balancing resistance to coal powder flow.
In some embodiments of the present application, the upper pulverized coal pipe 110 is provided with a first air intake connecting pipe 140 to appropriately supplement the primary air volume of the upper main burner, so as to ensure the air speed of the upper main burner and simultaneously increase the pulverized coal temperature, thereby further improving the combustion stabilizing effect.
In some embodiments of the present application, the upper coal dust pipe 110 is provided with an upper coal dust pipe flowmeter. In this embodiment, the upper pulverized coal pipe flow meter 150 is disposed downstream of the first throttling element 130, and is used for detecting the air volume in the upper pulverized coal pipe 110.
In some embodiments of the present application, the auxiliary pulverized coal pipe 210 is provided with a first shutoff valve 220 for shutting off the pulverized coal flow in the pipe, and the auxiliary burner 200 is operated at a low load and the auxiliary burner 200 is shut off at a high load. On the basis of the above embodiment example, an auxiliary powder tube flowmeter 230 is provided downstream of the first shut-off valve 220.
In some embodiments of the present application, the lower coal powder pipe 310 is further provided with a second cut-off valve 320, a second air inlet connecting pipe 330, a second throttling element 340, and a lower coal powder pipe flow meter 350.
In some embodiments of the present application, the auxiliary pulverized coal pipe 210 is further provided with a third air inlet joint 240 and a third throttling member 250.
Comparative example
The combustion system comprises an upper-layer combustor, a lower-layer combustor, an upper-layer medium-speed mill and a lower-layer medium-speed mill, wherein the upper-layer medium-speed mill provides bituminous coal to the upper-layer combustor, and the lower-layer medium-speed mill provides lean coal to the lower-layer combustor.
The combustion system provided by the embodiment can realize that the unit which can keep the safe and stable operation of the main engine has a wider load regulation range, and the lower limit of the load is regulated down from 45% of the comparative example to 15% -20%.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.
Claims (10)
1. A deep peak-regulation low-load stable combustion method for a medium-speed grinding four-corner tangential boiler is characterized by comprising a main combustor and an auxiliary combustor, wherein the main combustor adopts a plurality of layers of combustors, the uppermost layer of combustor delivers soft coal, and the lower layer of combustor delivers lean coal;
the auxiliary burner is arranged below the main burner; and leading a part of bituminous coal airflow at the inlet end of the burner at the uppermost layer to the auxiliary burner to form a stable combustion combination mode of two layers of bituminous coal airflow with middle lean coal airflow.
2. The method for deep-peaking low-load stable combustion of a medium-speed grinding quadrangle tangential boiler according to claim 1, wherein the main burners are specifically arranged in two layers.
3. The method for deep peak-shaving low-load stable combustion of the medium-speed grinding four-corner tangential boiler according to claim 1 or 2, characterized by further comprising medium-speed grinding, wherein the medium-speed grinding comprises an upper layer of medium-speed grinding for providing bituminous coal and a lower layer of medium-speed grinding for providing lean coal;
the main burner comprises an upper layer burner and a lower layer burner; the upper-layer combustor is connected with the upper-layer medium-speed mill through an upper-layer pulverized coal pipe, and the lower-layer combustor is connected with the lower-layer medium-speed mill through a lower-layer pulverized coal pipe;
and the auxiliary burner is connected with the upper-layer medium-speed mill through an auxiliary pulverized coal pipe.
4. The method for deep peak-shaving low-load stable combustion of the medium-speed grinding four-corner tangential boiler according to claim 3, wherein the auxiliary burner is a torch burner; with a vortex chamber.
5. The method according to claim 3, further comprising a pulverized coal splitter, wherein an inlet end of the pulverized coal splitter is connected with the upper-layer medium-speed mill through a pulverized coal pipeline, one path of an outlet end of the pulverized coal splitter is connected with the upper-layer burner through an upper-layer pulverized coal pipe, and the other path of the outlet end of the pulverized coal splitter is connected with the auxiliary burner through an auxiliary pulverized coal pipe.
6. The method according to claim 5, wherein the pulverized coal pipeline is provided with a shut-off gate and an adjustable shrinkage cavity.
7. The method according to claim 5, wherein an adjusting baffle is arranged in the pulverized coal splitter for adjusting the air volume and coal volume entering the upper burner or the auxiliary burner.
8. The method according to claim 3, wherein the upper pulverized coal pipe is provided with a first air inlet connecting pipe, a first throttling element and an upper pulverized coal pipe flowmeter in sequence.
9. The method according to claim 3, wherein the auxiliary pulverized coal pipe is sequentially provided with a first cut-off valve, a third air inlet pipe, a third throttling element and an auxiliary pulverized coal pipe flowmeter.
10. The method according to claim 3, wherein the lower pulverized coal pipe is provided with a second cut-off valve, a second air inlet connecting pipe, a second throttling element and a lower pulverized coal pipe flowmeter in sequence.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210754137.0A CN115325531A (en) | 2022-06-28 | 2022-06-28 | Deep peak-regulation low-load stable combustion method for medium-speed grinding four-corner tangential boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210754137.0A CN115325531A (en) | 2022-06-28 | 2022-06-28 | Deep peak-regulation low-load stable combustion method for medium-speed grinding four-corner tangential boiler |
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Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6023708A (en) * | 1983-07-19 | 1985-02-06 | Babcock Hitachi Kk | Combustion device for coal |
| US20140038115A1 (en) * | 2011-11-14 | 2014-02-06 | Fei Chen | Dense/Dilute Pulverized Coal Separator Structure of Single-fireball Octagonal Direct-flow Burner |
| CN103776015A (en) * | 2014-02-26 | 2014-05-07 | 章礼道 | Semi-tower three-flue double-damper added jet flow flue gas recirculation secondary reheating power station boiler |
| CN104180365A (en) * | 2014-08-29 | 2014-12-03 | 国家电网公司 | Blending combustion method of W-flame boiler using large-difference coal types |
| JP2015218920A (en) * | 2014-05-14 | 2015-12-07 | 株式会社東芝 | Coal-fired boiler and operation control method of the same |
| TW201632787A (en) * | 2014-11-21 | 2016-09-16 | 通用電器技術有限公司 | Plant, combustion apparatus, and method for reduction of nox emissions |
| CN108386865A (en) * | 2018-02-05 | 2018-08-10 | 长安益阳发电有限公司 | A kind of 300MW coal units reduce the control device and method of unburned carbon in flue dust |
| CN110319435A (en) * | 2019-07-01 | 2019-10-11 | 华能沁北发电有限责任公司 | A kind of wall firing boiler mixed coal combustion optimization method |
| CN111750346A (en) * | 2020-08-07 | 2020-10-09 | 西安热工研究院有限公司 | Combustor system suitable for degree of depth peak regulation |
| CN112747312A (en) * | 2021-02-20 | 2021-05-04 | 西安热工研究院有限公司 | Central wind protection method and device for preventing shutdown burning loss of cyclone burner |
-
2022
- 2022-06-28 CN CN202210754137.0A patent/CN115325531A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6023708A (en) * | 1983-07-19 | 1985-02-06 | Babcock Hitachi Kk | Combustion device for coal |
| US20140038115A1 (en) * | 2011-11-14 | 2014-02-06 | Fei Chen | Dense/Dilute Pulverized Coal Separator Structure of Single-fireball Octagonal Direct-flow Burner |
| CN103776015A (en) * | 2014-02-26 | 2014-05-07 | 章礼道 | Semi-tower three-flue double-damper added jet flow flue gas recirculation secondary reheating power station boiler |
| JP2015218920A (en) * | 2014-05-14 | 2015-12-07 | 株式会社東芝 | Coal-fired boiler and operation control method of the same |
| CN104180365A (en) * | 2014-08-29 | 2014-12-03 | 国家电网公司 | Blending combustion method of W-flame boiler using large-difference coal types |
| TW201632787A (en) * | 2014-11-21 | 2016-09-16 | 通用電器技術有限公司 | Plant, combustion apparatus, and method for reduction of nox emissions |
| CN108386865A (en) * | 2018-02-05 | 2018-08-10 | 长安益阳发电有限公司 | A kind of 300MW coal units reduce the control device and method of unburned carbon in flue dust |
| CN110319435A (en) * | 2019-07-01 | 2019-10-11 | 华能沁北发电有限责任公司 | A kind of wall firing boiler mixed coal combustion optimization method |
| CN111750346A (en) * | 2020-08-07 | 2020-10-09 | 西安热工研究院有限公司 | Combustor system suitable for degree of depth peak regulation |
| CN112747312A (en) * | 2021-02-20 | 2021-05-04 | 西安热工研究院有限公司 | Central wind protection method and device for preventing shutdown burning loss of cyclone burner |
Non-Patent Citations (1)
| Title |
|---|
| 胡光,金正淑: "四角切圆锅炉浓淡燃烧器的应用研究" * |
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