CN111121002A - Pulverized coal fired boiler with bottom burner and control method thereof - Google Patents
Pulverized coal fired boiler with bottom burner and control method thereof Download PDFInfo
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- CN111121002A CN111121002A CN201811295063.9A CN201811295063A CN111121002A CN 111121002 A CN111121002 A CN 111121002A CN 201811295063 A CN201811295063 A CN 201811295063A CN 111121002 A CN111121002 A CN 111121002A
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- secondary air
- air
- hearth
- distribution device
- distributed
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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
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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
- F23C10/00—Fluidised bed combustion apparatus
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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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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L11/00—Arrangements of valves or dampers after the fire
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L9/00—Passages or apertures for delivering secondary air for completing combustion of fuel
Abstract
The invention relates to a pulverized coal fired boiler with a burner at the bottom, which comprises: a hearth; the burner is provided with a fuel nozzle, and primary air carrying pulverized coal upwards enters the hearth through the fuel nozzle; wherein: the burner is arranged at the bottom of the hearth; the boiler also comprises a secondary air distribution device arranged at the bottom of the hearth around the burner, and the secondary air distribution device is used for upwards spraying secondary air, wherein the secondary air distribution device comprises an annular secondary air distribution device arranged around a burner nozzle and a distributed secondary air distribution device arranged between the annular secondary air distribution device and the side wall of the hearth. The invention also relates to a control method of the pulverized coal fired boiler, which comprises the following steps: injecting pulverized coal fuel upwards into the hearth through at least one burner arranged at the bottom of the hearth; and the secondary air is upwards sprayed into the hearth through the secondary air distribution device arranged at the bottom of the hearth around the burner.
Description
Technical Field
The embodiment of the invention relates to the field of boilers, in particular to a pulverized coal boiler and a control method thereof.
Background
In China, 46.7 thousands of coal-fired industrial boilers are used, about 7 hundred million tons of raw coal are consumed annually, and the coal-fired industrial boilers account for more than 18% of the total coal consumption in China. Industrial boilers are important thermal power equipment and are widely applied to various aspects such as factory power, building heating, people's life and the like. In 2015, the national energy agency has issued a coal clean and efficient utilization action plan (2015-2020), and is required to greatly promote the technical development and market application of the high-efficiency pulverized coal industrial boiler.
However, the existing coal-fired industrial boiler has the following technical defects:
(1) the deflagration tendency exists at the ignition moment of the pulverized coal: the main reason is that most of the coal powder fed into the hearth is cold coal powder, the coal powder needs to undergo preheating, volatilization analysis and ignition stages in the hearth, the temperature of the hearth at the ignition moment is low, the ignition time is long, and the deflagration tendency is increased;
(2) the boiler presents a vibration risk: the main reasons are that the combustion stability of pulverized coal is deteriorated, the pressure in the furnace continuously fluctuates, especially when the low-load operation is carried out, the temperature level in the furnace is low, the flame of pulverized coal combustion cannot be continuously transmitted, and the vibration risk of the boiler is increased;
(3) the original emission level of NOx generated by pulverized coal combustion is high: the original NOx emission level is more than 200mg/m3Above, afterbody denitration expense is higher, and has secondary pollution risk.
Disclosure of Invention
The present invention has been made to alleviate or solve at least one of the above-mentioned problems of the pulverized coal boiler.
According to an aspect of an embodiment of the present invention, there is provided a pulverized coal boiler with a burner being placed at the bottom, including: a hearth; and at least one burner, each burner having a fuel nozzle through which primary air carries pulverized coal upwardly into the furnace, wherein:
the burner is arranged at the bottom of the hearth;
the boiler also comprises a secondary air distribution device which is arranged at the bottom of the hearth around the burner and is used for upwards spraying secondary air;
the secondary air distribution device comprises an annular secondary air distribution device arranged around a burner nozzle and a distributed secondary air distribution device arranged between the annular secondary air distribution device and the side wall of the hearth.
Optionally, the boiler further comprises a tertiary air nozzle which is arranged in the middle or the middle upper part of the hearth in the height direction of the hearth. Further optionally, the annular secondary air distribution device is an annular secondary air nozzle.
Or further optionally, the annular secondary air distribution device comprises an annular secondary air chamber, an annular secondary air chamber air distribution plate and an air cap arranged on the annular secondary air chamber air distribution plate; or the annular secondary air distribution device comprises an air distribution pipe annularly arranged around the burner nozzle and an air cap arranged on the air distribution pipe.
Further optionally, the distributed secondary air distribution device includes a distributed secondary air chamber, a distributed secondary air chamber air distribution plate, and an air cap disposed on the distributed secondary air chamber air distribution plate; or the distributed secondary air distributing device comprises a plurality of air distributing pipes distributed at the bottom of the hearth and air caps arranged on the air distributing pipes.
Optionally, the equivalence ratio of the annular secondary air is 0.1-0.3; the equivalent ratio of the distributed secondary air is 0.3-0.6, and the total equivalent ratio of the distributed secondary air and the annular secondary air is 0.7-0.9.
Optionally, the air supply control device separately controls the annular secondary air and the distributed secondary air.
Optionally, the fuel nozzle, the air outlet of the annular secondary air and the air outlet of the distributed secondary air are located on the same horizontal plane.
Optionally, the speed of the fuel sprayed from the fuel nozzle is 10-30 m/s; the jet speed of the annular secondary air is 10-30 m/s; the spraying speed of the distributed secondary air is 5-10 m/s.
Optionally, the burner is a preheat burner.
The embodiment of the invention also relates to a control method of the pulverized coal fired boiler, which comprises the following steps: injecting pulverized coal fuel upwards into the hearth through at least one burner arranged at the bottom of the hearth; and secondary air is upwards sprayed into the hearth through a secondary air distribution device arranged at the bottom of the hearth around the burner, wherein the secondary air distribution device comprises an annular secondary air distribution device arranged around a burner nozzle and a distributed secondary air distribution device arranged between the annular secondary air distribution device and the side wall of the hearth.
Optionally, the method includes the steps of: controlling the equivalence ratio of the annular secondary air to be 0.1-0.3; and controlling the equivalent ratio of the distributed secondary air to be 0.3-0.6, and controlling the total equivalent ratio of the distributed secondary air to the annular secondary air to be 0.7-0.9.
Drawings
Fig. 1 is a schematic front view of a pulverized coal boiler in accordance with an exemplary embodiment of the present invention;
fig. 2 is a top view of the pulverized coal boiler of fig. 1;
fig. 3 is a schematic front view of a pulverized coal boiler in accordance with another exemplary embodiment of the present invention;
fig. 4 is a top view of the pulverized coal boiler of fig. 3;
fig. 5 is a schematic front view of a pulverized coal boiler in accordance with yet another exemplary embodiment of the present invention;
fig. 6 is a plan view of the pulverized coal boiler in fig. 5.
Detailed Description
The technical scheme of the invention is further specifically described by the following embodiments and the accompanying drawings. In the specification, the same or similar reference numerals denote the same or similar components. The following description of the embodiments of the present invention with reference to the accompanying drawings is intended to explain the general inventive concept of the present invention and should not be construed as limiting the invention.
Fig. 1-2 show a schematic front view and a top view of a pulverized coal boiler in an exemplary embodiment of the present invention.
As shown in fig. 1-2, the illustrated pulverized coal fired boiler includes a furnace 1, a preheating fuel nozzle 2, an annular secondary air connection pipe 3, an annular secondary air distribution device 4, a distributed secondary air connection pipe 5, a distributed secondary air chamber 6, a distributed secondary air chamber air distribution plate 7, a distributed secondary air cap 8, and a furnace tertiary air nozzle 9.
The hearth 1 can be of a square columnar structure, the side walls of the hearth are enclosed by four membrane type walls and comprise a front wall 11, a rear wall 12, a left side wall 13 and a right side wall 14, and the hearth can also be of a cylindrical structure or other columnar structures.
In the pulverized coal boiler shown in fig. 1-2, a preheating fuel nozzle 2 is positioned at the bottom of a hearth, an annular secondary air distribution device 4 is arranged at the periphery of the preheating fuel nozzle 2, an annular secondary air connecting pipe 3 is arranged at the bottom end side surface of an annular secondary air channel, a distributed secondary air distribution device which is approximately and uniformly distributed on most bottom surfaces of the hearth is arranged around the annular secondary air distribution device 4, air caps 8 of distributed secondary air can be distributed in multiple layers (in the radial direction), the air caps 8 of distributed secondary air are arranged on an air distribution plate 7 of a distributed secondary air chamber 6, and a distributed secondary air connecting pipe 5 is connected to the side surface of the distributed secondary air chamber 6.
In an alternative embodiment, the control of the distributed secondary air and the annular secondary air is completely separated and does not affect each other. The annular secondary air is arranged around the preheating fuel nozzle, and the distributed secondary air is arranged around the annular secondary air.
In an alternative embodiment, the preheating fuel jets 2, the annular overfire air outlets and the distributed overfire air outlets are in the same cross-section or in the same horizontal plane.
The annular secondary air distribution device can be a circular seam nested outside the fuel nozzle, or a group of air caps with an air distribution plate and an air chamber or a group of air caps on an air distribution pipe.
The distributed secondary air distribution device can comprise a group of air caps arranged on an air distribution plate with an air chamber, and can also comprise a group of air caps arranged on an air distribution pipe; the blast caps are approximately and uniformly distributed at the bottom of the hearth.
The middle part of the hearth is provided with a tertiary air nozzle 9 which can be arranged in opposite direction on the front wall and the rear wall of the hearth or arranged in tangential circles at four corners.
The operation of the example shown in fig. 1-2 is described below.
The primary air and the preheating fuel are sprayed out from the preheating fuel nozzle 2, the spraying speed of the primary air and the preheating fuel is 10-30m/s, the annular secondary air is sprayed out from the annular secondary air distribution device 4 through the annular secondary air connecting pipe 3, the injection speed of the annular secondary air is 10-30m/s, the annular secondary air tightly surrounds the periphery of the preheating fuel nozzle to accelerate mixing with the primary air, the distributed secondary air enters the secondary air chamber 6 through the secondary air connecting pipe 5 and is sprayed out through the air chamber air distribution plate 7 by the air cap 8, the distributed secondary air is uniformly discharged, the full-section air supply mode can delay rapid mixing and reaction of a large amount of secondary air and the preheating fuel, the high-temperature area of the combustion of the preheating fuel is weakened, meanwhile, the secondary air is supplied from the bottom, and deposition of pulverized coal particles on the bottom.
The tertiary air jet speed of the hearth is related to the section of the hearth and is generally between 10 and 20 m/s. The whole part below the tertiary air nozzle of the hearth is uniform reducing atmosphere, and the part above the tertiary air nozzle is a burnout area. The preheating fuel is a mixed substance of high-temperature coal gas and high-temperature coke, the high-temperature coal gas is a gas generated by the reaction and conversion of coal powder and primary air in the coal powder preheating process, and the high-temperature coke is a solid substance converted by the reaction of the coal powder in the coal powder preheating process. The ratio of the annular secondary air is related to the components of the preheating fuel, the temperature of the preheating fuel and the temperature of a hearth, if the heat value of the preheating fuel gas is high, the preheating fuel is quickly ignited, and in order to control the release rate of the combustion heat of the preheating fuel, the proportion of the annular secondary air can be reduced or the injection speed of the annular secondary air can be increased. The equivalence ratio of the annular secondary air is generally between 0.1 and 0.3. The distributed secondary air needs to be organically combined with the annular secondary air, the annular secondary air mainly ensures quick ignition and stable combustion of fuel, the distributed secondary air provides combustion-supporting gas for uniform combustion of the fuel in the whole space of the hearth, the combustion share and heat release of the fuel are guaranteed, the proportion of the distributed secondary air is higher than that of the annular secondary air, the air volume ratio of the distributed secondary air to the annular secondary air can be controlled to be 5:1-2:1, and the total equivalence ratio of the annular secondary air to the distributed secondary air can be controlled to be 0.7-0.9. In the combustion process of the preheating fuel, the temperature of the hearth is controlled between 1000-1200 ℃, so that the stable, efficient and low-nitrogen combustion of the preheating fuel is realized.
In the embodiment, the secondary air at the bottom of the hearth is provided with the annular secondary air and the distributed secondary air which surround the preheating fuel nozzle, and the air volume of the annular secondary air and the air volume of the distributed secondary air can be independently controlled. The annular secondary air is control air and adjusting air for stable combustion of fuel, and the distributed secondary air is main air for combustion of the fuel, and has double functions of adjusting the temperature of the hearth and controlling the atmosphere in the furnace. The whole part below the tertiary air nozzle of the hearth is a reducing atmosphere, namely the air equivalent coefficient below the tertiary air nozzle is less than 1.0.
Through the annular secondary air surrounding the preheating fuel nozzle, the rapid mixing and contact of the preheating fuel and the secondary air can be realized, the phenomenon that the preheating fuel is flamed out or is instable in combustion due to the fact that the preheating fuel is mixed with the secondary air too slowly or the cooling effect of a water-cooled wall of a hearth is avoided, and the air volume of the annular secondary air is related to the components of the preheating fuel, the temperature of the preheating fuel and the temperature of the hearth.
The distributed secondary air is mainly used for fuel combustion, after gasification reaction is carried out on the preheated fuel and the annular secondary air, the temperature of a hearth is increased, gasified gas and un-gasified coke and the like are expanded outwards from the center and then are contacted with the distributed secondary air, the air cap is used for supplying air to the whole section of a hearth, the flow field in the hearth is uniform, the preheated fuel and substances after the reaction of the annular secondary air react in the whole hearth space, and due to the fact that the air equivalence ratio below a tertiary air nozzle of the hearth is smaller than 1.0, no oxygen-rich atmosphere exists below the tertiary air nozzle of the hearth, in combination with the reaction process of the preheated fuel and the annular secondary air, the separation of nitrogen-containing substances is strengthened, the separated nitrogen-containing substances are easy to convert to nitrogen in the overall uniform reducing atmosphere below the tertiary air nozzle of the hearth, and the emission level of nitrogen oxides generated.
Fig. 3 is a schematic front view of a pulverized coal boiler in accordance with another exemplary embodiment of the present invention; fig. 4 is a plan view of the pulverized coal boiler in fig. 3.
As shown in fig. 3-4, the pulverized coal fired boiler comprises a hearth 1, a preheating fuel nozzle 2, an annular secondary air connecting pipe 3, an annular secondary air chamber 4, an annular secondary air chamber air distribution plate 5, an annular secondary air hood 6, a distributed secondary air connecting pipe 7, a distributed secondary air chamber 8, a distributed secondary air distribution plate 9, a distributed secondary air hood 10 and a hearth tertiary air nozzle 11.
The annular secondary air surrounds the periphery of the preheating fuel, and can also be supplied with air in a hood form, so that the mixing of the preheating fuel and the annular secondary air is accelerated, the rapid ignition and the stable combustion of the preheating fuel are ensured, the distributed secondary air ensures that a flow field and components in the furnace are uniform, the main space of the furnace below a tertiary air nozzle of the furnace is a reducing atmosphere, the local oxygen-enriched atmosphere is small, and the emission level of nitrogen oxides generated by the combustion of the preheating fuel is reduced.
Fig. 5 is a schematic front view of a pulverized coal boiler in accordance with still another exemplary embodiment of the present invention. Fig. 6 is a plan view of the pulverized coal boiler in fig. 5.
As shown in fig. 5-6, the pulverized coal fired boiler comprises a hearth 1, a preheating fuel nozzle 2 and a preheating fuel nozzle 5, wherein the periphery of the preheating fuel nozzle 2 is provided with an annular secondary air connecting pipe 3 and an annular secondary air distribution device 4, the periphery of the preheating fuel nozzle 5 is provided with an annular secondary air connecting pipe 6 and an annular secondary air distribution device 7, and the distributed secondary air distribution device comprises a secondary air connecting pipe 8, a secondary air chamber 9, an air distribution plate 10 and an air cap 15.
The furnace has set up 2 (also can more) preheating fuel nozzle, and every preheats fuel nozzle periphery and has set up and strengthen and preheating fuel mixing and controllable annular overgrate air, and annular overgrate air has set up the distributed overgrate air outward. The number of the annular secondary air chambers is the same as that of the preheating fuel nozzles, and the number of the distributed secondary air chambers can be only one or more, which is within the protection scope of the invention. The annular secondary air and the distributed secondary air can share the same air distribution plate.
It should be noted that, in the present invention, the "ring" in the "annular secondary air distribution device" may be, for example, that the air distribution device is integrally formed as one annular nozzle, or may be formed by arranging a plurality of nozzles or a nozzle cap in a ring shape surrounding the fuel nozzle, which are all within the protection scope of the present invention.
It should also be noted that in the present invention, "distributed" in "distributed secondary air distribution device" means distributed arrangement of air outlets (nozzles or hoods) of the air distribution device, for example, uniform distribution similar to a dot matrix, or annular arrangement(s) surrounding annular secondary air distribution device, which are all within the protection scope of the present invention.
Based on the above, the invention provides a pulverized coal boiler with a burner at the bottom, which comprises:
a hearth; and
at least one burner, each burner having a fuel nozzle through which primary air carries pulverized coal upwardly into the furnace,
wherein:
the burner is arranged at the bottom of the hearth;
the boiler also comprises a secondary air distribution device which is arranged at the bottom of the hearth around the burner and is used for upwards spraying secondary air;
the secondary air distribution device comprises an annular secondary air distribution device arranged around a burner nozzle and a distributed secondary air distribution device arranged between the annular secondary air distribution device and the side wall of the hearth.
The boiler can comprise a tertiary air nozzle which is arranged in the middle or the middle upper part of the hearth in the height direction of the hearth.
More specifically, the overgrate air distributing device includes: the annular secondary air distribution device is arranged around the nozzle of the combustor; and the distributed secondary air distribution device is arranged between the annular secondary air distribution device and the side wall of the hearth.
Correspondingly, the invention also provides a control method of the pulverized coal fired boiler, which comprises the following steps: injecting pulverized coal fuel upwards into the hearth through at least one burner arranged at the bottom of the hearth; and the secondary air is upwards sprayed into the hearth through the secondary air distribution device arranged at the bottom of the hearth around the burner.
In the invention, after the fuel (such as the preheating fuel) is sprayed into the hearth, the fuel can be quickly and timely mixed with the secondary air, so that the ignition time of the preheating fuel is shortened, the combustion stability of the preheating fuel is enhanced, and the ignition and deflagration tendency of the preheating fuel and the boiler vibration problem in the combustion process are avoided or reduced.
According to the invention, through organic combination and combined control of the annular secondary air and the distributed secondary air, the advanced conversion of nitrogen-containing substances in the mixing of the preheating fuel and the annular secondary air is accelerated, the main area below a tertiary air nozzle of a hearth is an integral uniform reducing atmosphere, a local oxygen-rich area is basically eliminated, the reduction degree of the nitrogen-containing substances is increased, and the NOx emission level of the combustion of the preheating fuel is reduced.
Although embodiments of the present invention have been shown and described, it would be appreciated by those skilled in the art that changes may be made in these embodiments and combinations of elements without departing from the principles and spirit of the invention, the scope of which is defined in the claims and their equivalents.
Claims (13)
1. A pulverized coal fired boiler with a burner at the bottom, comprising:
a hearth; and
at least one burner, each burner having a fuel nozzle through which primary air carries pulverized coal upwardly into the furnace,
wherein:
the burner is arranged at the bottom of the hearth;
the boiler also comprises a secondary air distribution device which is arranged at the bottom of the hearth around the burner and is used for upwards spraying secondary air;
the overgrate air wind distribution device includes:
the annular secondary air distribution device is arranged around the nozzle of the combustor; and
and the distributed secondary air distribution device is arranged between the annular secondary air distribution device and the side wall of the hearth.
2. The boiler of claim 1, further comprising:
and the tertiary air nozzle is arranged in the middle or the middle upper part of the hearth in the height direction of the hearth.
3. The boiler of claim 2, further comprising:
and the air supply control device is used for controlling the air supply proportion of the primary air, the secondary air and the tertiary air.
4. The boiler of claim 1, wherein:
the annular secondary air distribution device is an annular secondary air nozzle.
5. The boiler of claim 1, wherein:
the annular secondary air distribution device comprises an annular secondary air chamber, an annular secondary air chamber air distribution plate and an air cap arranged on the annular secondary air chamber air distribution plate; or
The annular secondary air distribution device comprises an air distribution pipe annularly arranged around a burner nozzle and an air cap arranged on the air distribution pipe.
6. The boiler of claim 1, wherein:
the distributed secondary air distribution device comprises a distributed secondary air chamber, a distributed secondary air chamber air distribution plate and an air cap arranged on the distributed secondary air chamber air distribution plate; or
The distributed secondary air distributing device comprises a plurality of air distributing pipes distributed at the bottom of the hearth and air caps arranged on the air distributing pipes.
7. The boiler of claim 1, wherein:
the equivalence ratio of the annular secondary air is 0.1-0.3;
the equivalent ratio of the distributed secondary air is 0.3-0.6, and the total equivalent ratio of the distributed secondary air and the annular secondary air is 0.7-0.9.
8. The boiler of claim 1, wherein:
the air supply control device separately controls the annular secondary air and the distributed secondary air.
9. The boiler of claim 1, wherein:
the fuel nozzle, the air outlet of the annular secondary air and the air outlet of the distributed secondary air are positioned on the same horizontal plane.
10. The boiler of claim 1, wherein:
the speed of the fuel sprayed from the fuel nozzle is 10-30 m/s;
the jet speed of the annular secondary air is 10-30 m/s;
the spraying speed of the distributed secondary air is 5-10 m/s.
11. The boiler according to any one of claims 1-10, wherein:
the burner is a preheat burner.
12. A control method of a pulverized coal fired boiler comprises the following steps:
injecting pulverized coal fuel upwards into the hearth through at least one burner arranged at the bottom of the hearth; and
the secondary air is upwards sprayed into the hearth through a secondary air distribution device arranged at the bottom of the hearth around the burner,
wherein:
the secondary air distribution device comprises an annular secondary air distribution device arranged around a burner nozzle and a distributed secondary air distribution device arranged between the annular secondary air distribution device and the side wall of the hearth.
13. The method according to claim 12, the method comprising the steps of:
controlling the equivalence ratio of the annular secondary air to be 0.1-0.3; and
controlling the equivalent ratio of the distributed secondary air to be 0.3-0.6, and controlling the total equivalent ratio of the distributed secondary air to the annular secondary air to be 0.7-0.9.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811295063.9A CN111121002A (en) | 2018-11-01 | 2018-11-01 | Pulverized coal fired boiler with bottom burner and control method thereof |
| PCT/CN2019/114598 WO2020088567A1 (en) | 2018-11-01 | 2019-10-31 | Pulverized coal boiler with bottom-arranged combustor, and control method therefor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811295063.9A CN111121002A (en) | 2018-11-01 | 2018-11-01 | Pulverized coal fired boiler with bottom burner and control method thereof |
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| CN111121002A true CN111121002A (en) | 2020-05-08 |
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| CN201811295063.9A Pending CN111121002A (en) | 2018-11-01 | 2018-11-01 | Pulverized coal fired boiler with bottom burner and control method thereof |
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| CN (1) | CN111121002A (en) |
| WO (1) | WO2020088567A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111561694A (en) * | 2020-06-03 | 2020-08-21 | 国网浙江省电力有限公司电力科学研究院 | Method and system for improving low-load SCR inlet smoke temperature of coal-fired boiler |
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| CN202350011U (en) * | 2011-12-06 | 2012-07-25 | 中交一公局第三工程有限公司 | Pulverized coal combustion system |
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| CN111561694A (en) * | 2020-06-03 | 2020-08-21 | 国网浙江省电力有限公司电力科学研究院 | Method and system for improving low-load SCR inlet smoke temperature of coal-fired boiler |
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