CN213686908U - Temperature-adjustable anti-slag air system with independent air source - Google Patents
Temperature-adjustable anti-slag air system with independent air source Download PDFInfo
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- CN213686908U CN213686908U CN202022706112.2U CN202022706112U CN213686908U CN 213686908 U CN213686908 U CN 213686908U CN 202022706112 U CN202022706112 U CN 202022706112U CN 213686908 U CN213686908 U CN 213686908U
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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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/30—Technologies for a more efficient combustion or heat usage
Abstract
A temperature-adjustable anti-slag wind system with an independent wind source comprises an independent anti-slag wind source provided by an anti-slag fan, wherein the outlet of the anti-slag fan is divided into three paths, two paths of the air are a cold anti-slag wind main pipe, the other path of the air passes through an anti-slag wind heat exchanger to form a hot anti-slag wind main pipe, the cold anti-slag wind main pipe and the hot anti-slag wind main pipe are respectively provided with a cold anti-slag wind adjusting door and a hot anti-slag wind adjusting door, a pipeline after cold and hot anti-slag wind are mixed is provided with a thermocouple thermometer and a pressure transmitter, and the mixed anti-slag wind is divided into four paths to be respectively led to four corners of a boiler furnace; the anti-slag wind heat exchanger heats the anti-slag wind by using hot flue gas from the flue gas of the steering chamber, and cooled cold flue gas is sent to an inlet of the SCR denitration reactor to be mixed with main flue gas. The utility model discloses a prevent that sediment wind multilayer is arranged and low wind rate, high wind speed design guarantee to control the flue gas temperature near the water-cooling wall in a flexible way under the prerequisite that does not influence water-cooling wall heat transfer and running life to realize the purpose of prevention and cure water-cooling wall slagging-off, reasonable in design arranges in a flexible way.
Description
Technical Field
The utility model belongs to the technical field of coal fired boiler furnace water-cooling wall slagging scorification prevention and control, especially, relate to an adjustable temperature of independent wind regime prevents sediment wind system.
Background
Coal occupies a leading position in the energy structure of China at present and in a long period of time in the future, according to the market situation of domestic electric coal, most of coal-fired power plants burn part of low ash fusion point, high ash content and low calorific value coal such as eastern Junggar coal at present to improve the operation benefit of the coal-fired power plants, but adverse effects such as serious slag bonding of a water-cooled wall heating surface of a hearth, large slag falling of the hearth and even unplanned shutdown of the boiler are caused, and the safe and stable operation of the coal-fired boiler is seriously hindered.
In addition, the designed air volume margin of the primary air fan of the existing coal-fired unit is basically about 10%, and the primary air volume of part of coal-fired boilers is insufficient when coal deviating from the designed coal quality is mixed and burned, so that the problem of insufficient air volume exists when cold air and hot air of a primary air system are used as slag prevention air sources to control the slagging of a water-cooled wall of the boiler.
At present, the slag-preventing measures of domestic coal-fired boilers mainly comprise the following steps:
(1) combustion optimization adjustment is carried out, and the slag bonding on the heating surface of the boiler is relieved by reasonably adjusting a combustion air distribution mode, but the method has a limited effect on relieving the slag bonding on the heating surface;
(2) high ash fusion point coal is co-fired, and the slag formation on the heating surface of the boiler is relieved by increasing the co-firing proportion of the high ash fusion point coal, so that the method can effectively reduce the slag formation degree of the heating surface to a certain extent, but is influenced by the domestic coal market, the price of the high ash fusion point coal is higher, and meanwhile, the situation that the high ash fusion point coal can not be co-fired in part of areas such as Xinjiang and the like is generated;
(3) the number and the soot blowing frequency of soot blowers on the heating surface of the hearth are increased, and the slagging degree of the heating surface of the boiler is controlled, so that the amount of steam for soot blowing is increased, and the tendency of soot blowing abrasion of a water cooling wall is improved;
(4) the method can control the slagging in a certain period, but has a service life and is greatly influenced by the spraying material and the spraying quality of a supply factory.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to the above-mentioned problem, provide a sediment wind system is prevented in adjustable temperature of independent wind regime, through near the lower air current cover of formation temperature and isolated layer near the water-cooling wall, reduce near the flue gas temperature of water-cooling wall, make fused clinker aggregate solidify into the lime-ash granule before reacing the water-cooling wall, realize the effective prevention and cure of boiler water-cooling wall slagging scorification.
In order to achieve the above purpose, the utility model adopts the following technical scheme to realize:
a temperature-adjustable anti-slag wind system with an independent wind source comprises an anti-slag wind machine providing an independent anti-slag wind source, wherein the outlet of the anti-slag wind machine is divided into three paths, two paths are a cold anti-slag wind main pipe, the other path passes through an anti-slag wind heat exchanger to form a hot anti-slag wind main pipe, a cold anti-slag wind adjusting door and a hot anti-slag wind adjusting door are respectively arranged on the cold anti-slag wind main pipe and the hot anti-slag wind main pipe and are used for adjusting the wind quantity of cold and hot anti-slag wind, a thermocouple thermometer and a pressure transmitter are arranged on a mixed cold and hot anti-slag wind pipeline and are used for monitoring the temperature and pressure of the mixed anti-slag wind and serving as the opening feedback values of the cold and hot anti-slag wind adjusting doors, the mixed anti-slag wind is divided into four paths and is respectively led to four corners of a boiler furnace, and a manual adjusting air door and an anti-slag wind nozzle are respectively arranged; the anti-slag wind heat exchanger heats the anti-slag wind by using hot flue gas from the flue gas of the steering chamber, and cooled cold flue gas is sent to an inlet of the SCR denitration reactor to be mixed with main flue gas.
The utility model discloses further improvement lies in, prevents that sediment wind heat exchanger flue gas side comprises hot flue gas pipeline and cold flue gas pipeline respectively, is equipped with flue gas volume adjusting baffle on the hot flue gas pipeline.
The utility model discloses further improvement lies in, prevents that the sediment fan amount of wind is exerted oneself and is guaranteed that prevent that sediment wind rate is not more than 5%, prevents that sediment fan export wind pressure control is at 6 ~ 8 kPa.
The utility model discloses further improvement lies in, prevents that sediment wind temperature is adjusted through cold prevents sediment wind adjustment gate and hot prevents sediment wind adjustment gate, prevents that sediment wind temperature can control at 150 ℃ -300 ℃.
The utility model discloses further improvement lies in, send to the cold flue gas temperature control before SCR denitration reactor entry after preventing the sediment wind heat exchanger heat transfer by the hot flue gas that the room flue gas that turns to comes at 300 ~ 320 ℃.
The utility model discloses further improvement lies in, prevents the sediment wind pressure after the mother's pipe of sediment wind and cold is prevented the mother's pipe of sediment wind by the heat and mix 5 ~ 7kPa scope, prevents the wind speed control of sediment wind spout department at 40 ~ 80 ms simultaneously.
The utility model discloses a further improvement lies in, is equipped with air regulation air door and air quantity measuring device on every way prevents that the sediment wind branch pipe is equipped with, makes the sediment wind amount of wind of preventing that causes the furnace four corners balanced.
The utility model discloses further improvement lies in, every way prevents that the sediment wind branch pipe divide into 3 ~ 5 layers near furnace to by the difference prevent that the sediment wind spout is close to the water-cooling wall area along combustor to the high scope of the air-over-fire and spout into in furnace, reduce near the flue gas temperature of water-cooling wall and prevent and treat water-cooling wall slagging scorification, the opposed firing boiler prevents that the sediment wind spouts near the boiler front back wall is close to near both sides wall water-cooling wall and arranges, the boiler is prevented that the sediment wind spout is close to near the water-cooling wall and arranges along the rotatory air current of flue gas in the boiler four corners in the reverse direction to the tangential firing boiler.
Compared with the prior art, the utility model discloses following beneficial effect has at least:
the utility model provides a temperature-adjustable slag-proof air system of an independent air source, which has reasonable design and flexible arrangement, and firstly, the slag-proof air system with flexibly adjustable temperature can ensure that the flue gas temperature near the water wall can be flexibly controlled on the premise of not influencing the heat exchange and the service life of the water wall, so as to realize the purpose of preventing slag bonding; secondly, the slag wind prevention multi-layer arrangement and the low wind rate and high wind speed design are adopted, so that the large-area protection of the slag wind prevention on the water-cooled wall can be realized on the premise of ensuring that the operation parameters of the boiler are not influenced as much as possible; and thirdly, the boiler smoke is used for heating the anti-slag air, so that the smoke exhaust temperature can be reduced, and the thermal efficiency of the boiler is improved.
Drawings
Fig. 1 is a schematic view of the temperature-adjustable anti-slag air system (opposed firing boiler) of the independent air source of the present invention.
Fig. 2 is a schematic diagram of the temperature-adjustable anti-slag air system (a corner tangential firing boiler) of the independent air source of the present invention.
Description of reference numerals:
1 is a slag-proof fan; 2 is a slag wind prevention heat exchanger; 3 is a cold slag-proof air adjusting door; 4 is a cold slag prevention air main pipe; 5 is a hot anti-slag wind adjusting door; 6 is a heat slag-proof air main pipe; 7 is a thermocouple thermometer; 8 is a pressure transmitter; 9 is an air quantity adjusting air door; 10 is a manual air damper; 11 is an air quantity measuring device; 12 is a slag wind prevention nozzle; 13 is a slag wind prevention branch pipe; 14 is a hot flue gas pipeline; 15 is a cold flue gas pipeline; and 16 is a flue gas quantity adjusting baffle.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1 and 2, the utility model provides a slag wind system is prevented in adjustable temperature of independent wind regime has as follows:
(1) the output of the air quantity of the slag prevention fan 1 ensures that the slag prevention air rate is not more than 5 percent, the air pressure of the outlet of the slag prevention fan 1 is controlled at 6-8 kPa, the smaller air quantity and the higher air pressure are utilized to overcome the system resistance and realize the control of slag bonding of the water-cooled wall.
(2) The slag-proof air source is provided by a slag-proof fan 1, the outlet of the slag-proof fan 1 is divided into three paths, wherein two paths are a cold slag-proof air main pipe 4, the other path is formed into a hot slag-proof air main pipe 6 after passing through a slag-proof air heat exchanger 2, a cold slag-proof air adjusting door 3 and a hot slag-proof air adjusting door 5 are respectively arranged on the cold slag-proof air main pipe 4 and the hot slag-proof air main pipe 6 and used for adjusting the air quantity of cold slag-proof air and hot slag-proof air, a thermocouple thermometer 7 and a pressure transmitter 8 are arranged on a pipeline after the cold slag-proof air and the hot slag-proof air are mixed and used for monitoring the temperature and the pressure of the mixed slag-proof air and taking the temperature and the pressure as the feedback values of the opening degrees of the cold slag-proof air and the hot slag-proof air adjusting doors, the mixed slag-proof air is divided into four paths and respectively led to four corners of a boiler furnace, and an air quantity measuring device; the anti-slag wind heat exchanger 2 heats the anti-slag wind by utilizing hot flue gas from the flue gas of the steering chamber, cooled cold flue gas is sent to an inlet of the SCR denitration reactor to be mixed with main flue gas, the flue gas side of the anti-slag wind heat exchanger 2 is respectively composed of a hot flue gas pipeline 14 and a cold flue gas pipeline 15, and a flue gas quantity adjusting baffle 16 is arranged on the hot flue gas pipeline 14.
(3) The opening degrees of the cold anti-slag air adjusting door 3 and the hot anti-slag air adjusting door 5 are reasonably adjusted to control the air pressure after the cold anti-slag air and the hot anti-slag air are mixed within the range of 5-7 kPa to ensure that the anti-slag air has enough static pressure to overcome the resistance of a subsequent system, the temperature after the cold anti-slag air and the hot anti-slag air are mixed is controlled within the range of 150-300 ℃, and the control temperature of the anti-slag air in operation under different loads is determined by comprehensively evaluating the slag bonding degree of a water-cooled wall of a boiler.
(4) The temperature of cold flue gas which is sent to the inlet of the SCR denitration reactor after hot flue gas from the flue gas of the steering chamber exchanges heat through the anti-slag air heat exchanger 2 is controlled to be 300-320 ℃.
(5) The air quantity of the anti-slag air led to the four corners of the hearth can be balanced by adjusting the air quantity adjusting air door 9 and the manual adjusting air door 10 and monitoring the air quantity measuring device 11; each slag-proof air branch pipe 13 is divided into 3-5 layers near a hearth, and is sprayed into the hearth from a respective slag-proof air nozzle 12 along the height range of a burner to the over-fire air and close to the wall surface area of a water-cooled wall, the slag-proof air nozzles 12 of the opposed firing boiler are arranged near the water-cooled walls of two side walls on the front wall and the rear wall of the boiler, the slag-proof air nozzles 12 of the tangential firing boiler at four corners are arranged near the water-cooled walls along the opposite direction of the rotating airflow of the flue gas, the air speed at the slag-proof air nozzles 12 is controlled at 40-80 m/s, large-area protection of the water-cooled walls is realized at a higher air speed, the temperature of the flue gas near the water.
The utility model provides a pair of slag-proof air system is prevented in adjustable temperature of independent wind regime, reasonable in design arranges in a flexible way, provides a new method of prevention and cure boiler water-cooling wall slagging scorification. Firstly, the slag-preventing air system with flexibly adjustable temperature can ensure that the temperature of the flue gas near the water-cooled wall can be flexibly controlled on the premise of not influencing the heat exchange and the service life of the water-cooled wall, so as to realize the purpose of preventing slag bonding; secondly, the slag wind prevention multi-layer arrangement and the low wind rate and high wind speed design are adopted, so that the large-area protection of the slag wind prevention on the water-cooled wall can be realized on the premise of ensuring that the operation parameters of the boiler are not influenced as much as possible; and thirdly, the boiler smoke is used for heating the anti-slag air, so that the smoke exhaust temperature can be reduced, and the thermal efficiency of the boiler is improved.
Without departing from the scope of the present invention, various changes and modifications may be made by those skilled in the art, and all equivalent technical solutions should also fall within the scope of the present invention.
Claims (8)
1. The temperature-adjustable anti-slag air system with the independent air source is characterized by comprising an anti-slag air blower (1) for providing the independent anti-slag air source, wherein the outlet of the anti-slag air blower (1) is divided into three paths, wherein, the two paths are a cold anti-slag wind main pipe (4), the other path is formed into a hot anti-slag wind main pipe (6) after passing through the anti-slag wind heat exchanger (2), a cold anti-slag wind adjusting door (3) and a hot anti-slag wind adjusting door (5) are respectively arranged on the cold anti-slag wind main pipe (4) and the hot anti-slag wind main pipe (6) for adjusting the wind quantity of the cold and hot anti-slag wind, a thermocouple thermometer (7) and a pressure transmitter (8) are arranged on a pipeline after the cold and hot anti-slag wind are mixed for monitoring the temperature and the pressure of the mixed anti-slag wind and taking the temperature and the pressure as the feedback value of the opening degree of the cold and hot anti-slag wind adjusting doors, the mixed anti-slag wind is divided into four paths, and respectively led to four corners of a boiler furnace, and each slag-proof air branch pipe (13) is respectively provided with a manual air adjusting door (10) and a slag-proof air nozzle (12); the anti-slag wind heat exchanger (2) heats the anti-slag wind by using hot flue gas from the flue gas of the steering chamber, and cooled cold flue gas is sent to the inlet of the SCR denitration reactor to be mixed with main flue gas.
2. The temperature-adjustable anti-slag air system of the independent air source according to claim 1, characterized in that the flue gas side of the anti-slag air heat exchanger (2) is respectively composed of a hot flue gas pipeline (14) and a cold flue gas pipeline (15), and a flue gas quantity adjusting baffle plate (16) is arranged on the hot flue gas pipeline (14).
3. The temperature-adjustable slag wind prevention system of an independent wind source according to claim 1, characterized in that the wind output of the slag wind prevention fan (1) ensures that the slag wind prevention rate is not more than 5%, and the wind pressure at the outlet of the slag wind prevention fan (1) is controlled to be 6-8 kPa.
4. The temperature-adjustable anti-slag wind system of an independent wind source according to claim 1, characterized in that the anti-slag wind temperature is adjusted by a cold anti-slag wind adjusting door (3) and a hot anti-slag wind adjusting door (5), and the anti-slag wind temperature can be controlled at 150 ℃ to 300 ℃.
5. The temperature-adjustable anti-slag air system with the independent air source as claimed in claim 1, wherein the temperature of cold flue gas before the hot flue gas from the flue gas of the steering chamber is sent to the inlet of the SCR denitration reactor after heat exchange by the anti-slag air heat exchanger (2) is controlled to be 300-320 ℃.
6. The temperature-adjustable anti-slag wind system of an independent wind source according to claim 1, wherein the anti-slag wind pressure after the hot anti-slag wind main pipe (6) and the cold anti-slag wind main pipe (4) are mixed is in the range of 5-7 kPa, and the wind speed at the anti-slag wind nozzle is controlled to be 40-80 m/s.
7. The temperature-adjustable anti-slag wind system of an independent wind source according to claim 1, characterized in that an air quantity adjusting damper (9) and an air quantity measuring device (11) are arranged on each anti-slag wind branch pipe (13) to balance the air quantity of the anti-slag wind led to the four corners of the hearth.
8. The temperature-adjustable slag-proof air system with the independent air source as claimed in claim 1, wherein each slag-proof air branch pipe (13) is divided into 3-5 layers near the furnace, and is sprayed into the furnace from a separate slag-proof air nozzle (12) along the height range from the burner to the over-fire air near the wall surface of the water-cooled wall, so as to reduce the temperature of the flue gas near the water-cooled wall and prevent the slag from forming on the water-cooled wall, the slag-proof air nozzles (12) of the opposed firing boiler are arranged near the water-cooled walls of the two side walls on the front and back walls of the boiler, and the slag-proof air nozzles (12) of the tangential firing boiler are arranged near the water-cooled walls at four corners of the boiler in the opposite direction of the rotating airflow.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022706112.2U CN213686908U (en) | 2020-11-20 | 2020-11-20 | Temperature-adjustable anti-slag air system with independent air source |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022706112.2U CN213686908U (en) | 2020-11-20 | 2020-11-20 | Temperature-adjustable anti-slag air system with independent air source |
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| CN213686908U true CN213686908U (en) | 2021-07-13 |
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| CN202022706112.2U Active CN213686908U (en) | 2020-11-20 | 2020-11-20 | Temperature-adjustable anti-slag air system with independent air source |
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