CN108180469B - Method and device for adjusting steam temperature by using burner or powder process exhaust gas - Google Patents
Method and device for adjusting steam temperature by using burner or powder process exhaust gas Download PDFInfo
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- CN108180469B CN108180469B CN201810153113.3A CN201810153113A CN108180469B CN 108180469 B CN108180469 B CN 108180469B CN 201810153113 A CN201810153113 A CN 201810153113A CN 108180469 B CN108180469 B CN 108180469B
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- exhaust gas
- burner
- hearth
- steam temperature
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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
- F23C9/00—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber
- F23C9/08—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber for reducing temperature in combustion chamber, e.g. for protecting walls of combustion chamber
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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
- F23K3/02—Pneumatic feeding arrangements, i.e. by air blast
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Abstract
The invention discloses a method and a device for adjusting steam temperature by utilizing burner or powder making exhaust gas, which belongs to the technical field of coal-fired boilers, wherein the exhaust gas separated from the burner or the exhaust gas of a powder making system is divided into two parts by a main pipe and is respectively introduced into an upper hearth and a lower hearth by an exhaust gas pipe, wherein the exhaust gas specific position introduced into the upper hearth is positioned between the burner at the uppermost layer and the exhaust gas of the lower layer, the exhaust gas specific position introduced into the lower hearth is positioned between the burner at the uppermost layer and the overgrate air at the lowermost layer for a w-flame boiler, and the exhaust gas specific position is arranged between the burner at the uppermost layer and the burner at the lowermost layer for a tangential circle or a opposite-flow boiler; the exhaust air pipeline introduced into the upper hearth and the lower hearth is respectively provided with a shutoff valve for closing or opening exhaust air supply and a regulating valve for regulating the exhaust air quantity. The invention aims to solve the problem of 'high load over temperature and low load steam temperature deficiency' of a pulverized coal boiler, in particular a W-shaped flame boiler.
Description
Technical Field
The invention belongs to the technical field of coal-fired boilers.
Background
At present, the power station boiler has the problems of over-temperature or insufficient steam temperature more or less, particularly the pulverized coal boiler, and in high load, a great amount of desuperheating water has to be added for maintaining the steam temperature not higher than the upper line, and sometimes the reheat steam has to be added for desuperheating water when the over-temperature is serious, so that the safety and the economy of a unit are seriously affected; on the other hand, when the low-load operation is performed, the steam temperature is difficult to reach the design value, the steam temperature of some unit boilers is much lower, especially the reheat steam temperature is even 40-50 ℃, and the economy of the unit is also seriously affected.
The contradiction of 'high load overtemperature and low load steam temperature deficiency' is difficult to be considered in both design and actual operation, and the adjustment can be carried out only by arranging a tail flue gas adjusting baffle at present, so that different allocations are carried out among the overreheaters, and the overreheated steam temperature cannot be integrally increased or reduced. This problem is more pronounced when the coal quality changes: when the coal quality is poor, the high load overtemperature is more obvious, and can only be controlled by adding a large amount of temperature reduction water, and sometimes the load reduction operation is required for the safe operation of the unit; when the volatile component of the coal becomes high, the low-load steam temperature is more insufficient, particularly the reheat steam temperature is lower more, at the moment, no adjusting means is provided for improving the steam temperature, and the contradiction is particularly obvious in the W flame boiler.
Disclosure of Invention
The invention aims at: the method and apparatus for regulating steam temperature with burner or exhaust gas from powder production solves the problems of high load over temperature and low load steam temperature deficiency in coal powder boiler, especially W-flame boiler.
The aim of the invention is achieved by the following technical scheme:
the device for adjusting the steam temperature by utilizing the burner or the powder making exhaust gas divides the exhaust gas separated by the burner or the powder making system exhaust gas into two parts by a main pipe and respectively introduces the two parts into an upper hearth and a lower hearth by an exhaust gas pipe, wherein the exhaust gas specific position introduced into the upper hearth is positioned between the uppermost burner and the lower layer of exhausted air, the exhaust gas specific position introduced into the lower hearth is positioned between the uppermost burner and the lowest layer of secondary air for a w-flame boiler, is positioned between the uppermost burner secondary air and the lowest layer of burner secondary air for a tangential boiler, and is positioned between the uppermost burner and the lowest layer of burner for a hedging boiler; the exhaust air pipeline introduced into the upper hearth and the lower hearth is respectively provided with a shutoff valve for closing or opening exhaust air supply and a regulating valve for regulating the exhaust air quantity.
The specific position of the exhaust gas introduced into the upper hearth is positioned between the uppermost burner and the lower exhaust air. The position is between the burner and the over-fire air, is a reducing atmosphere, is sprayed with ventilation air, and utilizes the reburning of pulverized coal carried in the ventilation air, so that on one hand, the heat release amount (equivalent to the improvement of the flame center position) of the position is increased, and the temperature of steam is improved; on the other hand, the emission of NOx can be reduced, and the carbon content of the fly ash is easier to control compared with that of the over-fired air because the fly ash is positioned before the over-fired air.
The boiler is a w-flame boiler, and the specific position of exhaust gas introduced into the lower hearth is positioned between the burner at the uppermost layer and the secondary air at the lowermost layer. The exhaust gas is introduced into the position, compared with other positions of the lower hearth, so that the heat release quantity of the lower hearth can be increased on the one hand, and the heat release of the upper hearth is reduced; on the other hand, the supporting of the secondary air at the lowest layer can not cause slag to directly drop into the ash cooling hopper, so that excessive ash loss is caused.
The boiler is a tangential boiler, and the specific position of exhaust gas introduced into the lower hearth is positioned between the secondary air of the uppermost layer burner and the secondary air of the lowermost layer burner. The exhaust gas is introduced into the position, compared with other positions of the lower hearth, so that the heat release quantity of the lower hearth can be increased on the one hand, and the heat release of the upper hearth is reduced; on the other hand, the slag is not directly dropped into the ash cooling hopper due to the supporting of the secondary air, so that excessive ash loss is caused.
The boiler is a hedging boiler, and the specific position of exhaust gas introduced into the lower hearth is positioned between the uppermost layer burner and the lowermost layer burner. The exhaust gas is introduced into the position, compared with other positions of the lower hearth, so that the heat release quantity of the lower hearth can be increased on the one hand, and the heat release of the upper hearth is reduced; on the other hand, the supporting of the lower burner does not cause slag to directly drop into the ash cooling hopper, so that excessive ash loss is caused.
Alternatively, the ventilation air vents are arranged in the form of a perimeter wind. In this scheme, can prevent around the spout coking.
The method for adjusting the steam temperature by adopting the device for adjusting the steam temperature by using the burner or the powder making exhaust gas reduces or closes the exhaust gas amount input into the upper hearth and increases the exhaust gas amount input into the lower hearth when the steam temperature exceeds the temperature or the temperature reduction water amount is large; when the steam temperature is insufficient, the exhaust gas amount input into the upper hearth is increased, and the exhaust gas amount input into the lower hearth is reduced or closed. In the scheme, when the steam temperature exceeds the temperature or the temperature reduction water quantity is large, the exhaust gas quantity input into the upper hearth is reduced or closed, the exhaust gas quantity input into the lower hearth is increased, and the flame center is lowered, so that the steam temperature and the temperature reduction water quantity are lowered; when the steam temperature is insufficient, the exhaust gas amount put into the upper hearth is increased, the exhaust gas amount put into the lower hearth is reduced or closed, and the flame center is improved, so that the steam temperature is improved.
Alternatively, the exhaust gas contains 10% + -5 weight of pulverized coal. The scheme utilizes the reburning of the part of coal dust to increase the heat release quantity at the place, thereby adjusting the flame center position.
The foregoing inventive subject matter and various further alternatives thereof may be freely combined to form a plurality of alternatives, all of which are employable and claimed herein; and the invention can be freely combined between the (non-conflicting choices) choices and between the choices and other choices. Various combinations will be apparent to those skilled in the art from a review of the present disclosure, and are not intended to be exhaustive or all of the present disclosure.
The working process is as follows: the invention utilizes the different introduction modes of the burner or the powder making exhaust gas, utilizes the reburning of the pulverized coal (preferably 10+/-5% by weight) carried in the exhaust gas, increases the heat release quantity (heat release of an upper hearth or a lower hearth) at the position, thereby adjusting the flame center position, and adjusts the steam temperature of the boiler (comprising the over-reheat steam temperature) by adjusting the flame center and increasing or reducing the heat absorption of a heating surface, and simultaneously can reduce the generation quantity of NOx by reburning of the superfine pulverized coal in the exhaust gas.
The invention has the beneficial effects that: according to the technical scheme, under the condition of not increasing or decreasing the heating surface, the problems which are not solved for a long time, namely the high-load overtemperature and low-load steam temperature deficiency of the pulverized coal boiler, particularly the W-type flame boiler, can be successfully solved by utilizing different introduction modes of the exhaust gas of the burner or the pulverizing system and matching with the original steam temperature adjusting means, and the safety and the economy of a unit are improved; meanwhile, the generation amount of NOx can be reduced through reburning of superfine pulverized coal in exhaust gas.
Drawings
FIG. 1 is a schematic flow chart of an apparatus according to embodiment 1 of the present invention;
fig. 2 is a schematic flow chart of the apparatus in embodiment 2 of the present invention.
Detailed Description
The following non-limiting examples illustrate the invention.
Example 1:
referring to fig. 1, a regulating system for a W-type flame boiler is shown, wherein a burner is shown in a position of a serial number 1, an overfire air is shown in a position of a serial number 2, a ventilation air nozzle is shown in a position of a serial number 3, a coal pulverizing ventilation air or burner ventilation air pipeline main pipe is shown in a serial number 4, a regulating valve for regulating flow is shown in a serial number 5, a shutoff valve is shown in a serial number 6, a secondary air is shown in a lowest layer of the serial number 7, an upper hearth is shown in a serial number 8, and a lower hearth is shown in a serial number 9.
(1) The exhaust gas of the pulverizing system or the burner is divided into two parts to be introduced into an upper hearth 8 and a lower hearth 9 through a main pipe 4 (the upper hearth 8 and the lower hearth 9 are defined by a horizontal dotted line in the figure, namely the upper hearth 8 is arranged above the burner 1 at the uppermost layer, and the burner 1 at the uppermost layer and the lower hearth 9 are arranged below the burner);
(2) The exhaust gas air pipelines led into the upper hearth 8 and the lower hearth 9 are respectively provided with a regulating valve 5 and a shutoff valve 6 for regulating and shutting off exhaust gas;
(3) Exhaust gas position 3 introduced into upper furnace 8: the burner is preferably arranged between the burner at the uppermost layer (only one layer of burner is arranged at the burner position 1 in the figure) and the combustion air at the lowest layer (only one layer of combustion air is arranged at the combustion air position 2 in the figure), and can also be arranged at other positions of the upper hearth 8;
(4) The exhaust gas location 3 introduced into the lower furnace 9: the air conditioner is preferably arranged between the uppermost burner position 1 and the lowermost secondary air 7, and can also be arranged at other positions of the lower hearth 9.
By adopting the method for adjusting the steam temperature by using the burner or the device for adjusting the steam temperature by using the powder making exhaust gas, when the steam temperature exceeds the temperature or the water quantity for reducing the temperature is large, the exhaust gas quantity input into the upper hearth is reduced or closed, and the exhaust gas quantity input into the lower hearth is increased; when the steam temperature is insufficient, the exhaust gas amount input into the upper hearth is increased, and the exhaust gas amount input into the lower hearth is reduced or closed. In the scheme, when the steam temperature exceeds the temperature or the temperature reduction water quantity is large, the exhaust gas quantity input into the upper hearth is reduced or closed, the exhaust gas quantity input into the lower hearth is increased, and the flame center is lowered, so that the steam temperature and the temperature reduction water quantity are lowered; when the steam temperature is insufficient, the exhaust gas amount put into the upper hearth is increased, the exhaust gas amount put into the lower hearth is reduced or closed, and the flame center is improved, so that the steam temperature is improved. Alternatively, the exhaust gas contains 10% + -5 weight of pulverized coal. The scheme utilizes the reburning of the part of coal dust to increase the heat release quantity at the place, thereby adjusting the flame center position.
Example 2:
referring to fig. 2, a regulating system for tangential boilers and opposite-flow boilers is shown, wherein a burner position is designated by a reference number 1, an overfire air position is designated by a reference number 2, an exhaust air nozzle introducing position is designated by a reference number 3, a powder process exhaust air or burner exhaust air pipeline main pipe is designated by a reference number 4, a regulating valve for regulating flow is designated by a reference number 5, a shutoff valve is designated by a reference number 6, an upper hearth is designated by a reference number 8, and a lower hearth is designated by a reference number 9.
(1) The exhaust gas of the pulverizing system or the burner is divided into two parts to be introduced into an upper hearth 8 and a lower hearth 9 through a main pipe 4 (the upper hearth 8 and the lower hearth 9 are defined by a horizontal dotted line in the figure, namely the upper hearth 8 is arranged above the burner 1 at the uppermost layer, and the burner 1 at the uppermost layer and the lower hearth 9 are arranged below the burner);
(2) The exhaust gas air pipelines led into the upper hearth 8 and the lower hearth 9 are respectively provided with a regulating valve 5 and a shutoff valve 6 for regulating and shutting off exhaust gas;
(3) Exhaust gas position 3 introduced into upper furnace 8: the burner is preferably arranged between the burner at the uppermost layer (4 layers of burners are arranged at the burner position 1 in the figure) and the combustion air at the lowest layer (only one layer of combustion air is arranged at the combustion air position 2 in the figure), and can also be arranged at other positions of the upper hearth 8;
(4) The exhaust gas location 3 introduced into the lower furnace 9: the burner is preferably arranged between the uppermost burner and the lowermost burner, and can be arranged at other positions of the lower hearth 9.
By adopting the method for adjusting the steam temperature by using the burner or the device for adjusting the steam temperature by using the powder making exhaust gas, when the steam temperature exceeds the temperature or the water quantity for reducing the temperature is large, the exhaust gas quantity input into the upper hearth is reduced or closed, and the exhaust gas quantity input into the lower hearth is increased; when the steam temperature is insufficient, the exhaust gas amount input into the upper hearth is increased, and the exhaust gas amount input into the lower hearth is reduced or closed. In the scheme, when the steam temperature exceeds the temperature or the temperature reduction water quantity is large, the exhaust gas quantity input into the upper hearth is reduced or closed, the exhaust gas quantity input into the lower hearth is increased, and the flame center is lowered, so that the steam temperature and the temperature reduction water quantity are lowered; when the steam temperature is insufficient, the exhaust gas amount put into the upper hearth is increased, the exhaust gas amount put into the lower hearth is reduced or closed, and the flame center is improved, so that the steam temperature is improved. Alternatively, the exhaust gas contains 10% + -5 weight of pulverized coal. The scheme utilizes the reburning of the part of coal dust to increase the heat release quantity at the place, thereby adjusting the flame center position.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (4)
1. The utility model provides a device that utilizes combustor or powder process exhaust gas to adjust steam temperature which characterized in that: the exhaust gas separated from the burner or the exhaust gas of the pulverizing system is divided into two by a main pipe and is respectively introduced into an upper hearth and a lower hearth through exhaust gas pipelines, wherein the specific position of the exhaust gas introduced into the upper hearth is positioned between the uppermost burner and the lower-layer exhaust gas, the specific position of the exhaust gas introduced into the lower hearth is positioned between the uppermost burner and the lowest-layer secondary air for a w-flame boiler, the exhaust gas is arranged between the uppermost burner secondary air and the lowest-layer secondary air for a tangential boiler, and the exhaust gas is arranged between the uppermost burner and the lowest-layer burner for a hedging boiler; the exhaust air pipeline introduced into the upper hearth and the lower hearth is respectively provided with a shutoff valve for closing or opening exhaust air supply and a regulating valve for regulating the exhaust air quantity.
2. The apparatus for regulating steam temperature using burner or mill off-gas as claimed in claim 1, wherein: the exhaust air nozzle is arranged in the form of a peripheral air.
3. A method for regulating steam temperature by using the device for regulating steam temperature by using burner or powder process exhaust gas as claimed in claim 1 or 2, characterized in that: when the steam temperature exceeds the temperature or the temperature reduction water quantity is large, the ventilation quantity input into the upper hearth is reduced or closed, and the ventilation quantity input into the lower hearth is increased; when the steam temperature is insufficient, the exhaust gas amount input into the upper hearth is increased, and the exhaust gas amount input into the lower hearth is reduced or closed.
4. A method for regulating steam temperature using burner or means for regulating steam temperature from powder process exhaust as claimed in claim 3, wherein: 10% + -5% by weight of coal fines was entrained in the exhaust gas.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810153113.3A CN108180469B (en) | 2018-02-12 | 2018-02-12 | Method and device for adjusting steam temperature by using burner or powder process exhaust gas |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810153113.3A CN108180469B (en) | 2018-02-12 | 2018-02-12 | Method and device for adjusting steam temperature by using burner or powder process exhaust gas |
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| CN108180469A CN108180469A (en) | 2018-06-19 |
| CN108180469B true CN108180469B (en) | 2023-07-14 |
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| CN110645569B (en) * | 2019-11-01 | 2023-10-24 | 国能南京电力试验研究有限公司 | Combustion system and combustion method for improving flexibility of W-flame boiler coal types |
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| CN107606604A (en) * | 2017-10-26 | 2018-01-19 | 贵州电网有限责任公司电力科学研究院 | A kind of new change arch angle W type flame boilers |
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| CN101368725A (en) * | 2008-09-27 | 2009-02-18 | 哈尔滨工业大学 | Stable combustion anti-slag gap type W-shaped flame boiler apparatus |
| CN101865456A (en) * | 2010-07-16 | 2010-10-20 | 贵州电力试验研究院 | Slit-type burner W type flame boiler with high burning performance and preparation method thereof |
| CN101986028A (en) * | 2010-11-18 | 2011-03-16 | 浙江大学 | Low-NOx W-type flame boiler with dry bottom hopper and furnace bottom air supplies distributed in bielliptical shape |
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