CN217154150U - Boiler high temperature heating surface thermal deviation adjusting device - Google Patents
Boiler high temperature heating surface thermal deviation adjusting device Download PDFInfo
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- CN217154150U CN217154150U CN202220648587.7U CN202220648587U CN217154150U CN 217154150 U CN217154150 U CN 217154150U CN 202220648587 U CN202220648587 U CN 202220648587U CN 217154150 U CN217154150 U CN 217154150U
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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
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Abstract
The utility model discloses a boiler high temperature heating surface thermal deviation adjusting device, include boiler furnace and arrange in boiler furnace and be located a plurality of temperature regulation wind spouts of platen superheater below, a plurality of temperature regulation wind spouts communicate through bypass wind channel and hot secondary air duct and/or the wind all the way that hot primary air duct bypass was drawn forth, are provided with the temperature regulation wind bellows in the boiler furnace periphery of arranging the temperature regulation wind spout, the temperature regulation wind bellows forms the cavity that communicates with the all temperature regulation wind spouts of corresponding side with boiler furnace cooperation, the cavity intercommunication in bypass wind channel and the temperature regulation wind bellows. The utility model discloses an arrange the temperature-adjusting wind, adjust local flue gas side temperature and reach the purpose that reduces the hot deviation of heating surface, effectively solve or obviously improve the wall temperature deviation, promote the reheat steam temperature to improve boiler operational parameter and unit efficiency, improve the economic benefits of power plant, assume to improve reheat steam temperature from 615 ℃ to 623 ℃, then can reduce the power supply coal consumption at least 0.15g kg g, and can guarantee the long-term safe operation of heating surface.
Description
Technical Field
The utility model belongs to the technical field of boiler manufacture and transformation, in particular to boiler high temperature is heated face thermal deviation adjusting device.
Background
The net efficiency of the whole generator set can be improved by improving the steam parameters of the boiler, the coal consumption is reduced, the main steam temperature and the reheat steam temperature of the ultra-supercritical boiler reach 605/603 ℃ at present, and the reheat steam temperature of the high-efficiency ultra-supercritical boiler is designed according to 623 +/-5 ℃. The higher the steam temperature is, the closer the steam temperature is to the allowable alarm temperature of the material, the smaller the required thermal deviation is, the higher the design requirement is, and the measures for reducing the thermal deviation need to be considered from the steam side and the smoke side during the boiler design.
From the operation condition of a high-parameter (temperature) boiler in the market, when the main steam temperature and the reheating steam temperature are in a stable state, the main steam temperature and the reheating steam temperature can reach the lower limit of rated values after refined combustion adjustment, the maximum wall temperature of a heating surface is only 5-10 ℃ away from the overtemperature alarm temperature of a material, the overtemperature alarm temperature is very easy to be overtemperature when variable-load and different coal mills are operated in a combined mode, the overtemperature time and times have great influence on the service life of a pipe, oxide skin is easy to generate and fall off, and the pipe explosion and great loss of the boiler are caused by the blockage of the oxide skin.
In order to reserve more margin, the power plant is usually operated by adopting a reduced parameter, for example, a million ultra-supercritical boiler with the reheated steam temperature of 623 ℃, and an operator usually operates the boiler with the reduced parameter of 615 ℃, so that the power supply coal consumption is increased by 0.3 g/kg.g, and the economical efficiency of the power plant is influenced.
The local area wall temperature is high, which restricts the whole steam temperature to be improved, and the reduction of the local wall temperature is the key for solving the problem. As shown in fig. 1, the curve is a tube panel wall temperature distribution diagram, the increase of the overall steam temperature is restricted by A, B two wall temperature high points, if the smoke temperature of A, B two areas is reduced during operation, the corresponding wall temperature is reduced, the deviation of the overall wall temperature is smaller, and the overall steam temperature can be further increased.
Once the boiler is designed and formed, the flow distribution of the steam side can not be adjusted generally, and the heat deviation in operation is mainly influenced by the smoke side. The thermal deviation can be reduced to some extent by combustion adjustment such as wind-powder uniformity adjustment, but this method has disadvantages in that adjustment in an early stage after a mill combination or a change in coal type may be disabled and a high point region of the wall temperature may move.
SUMMERY OF THE UTILITY MODEL
The invention of the utility model aims to: to the problem that above-mentioned exists, provide one kind and can effectively adjust local flue gas side temperature, reach the boiler high temperature that reduces the heating surface thermal deviation adjusting device who receives the hot deviation purpose.
The utility model discloses a realize through following technical scheme: the utility model provides a boiler high temperature heating face thermal deviation adjusting device, includes boiler furnace and arranges in boiler furnace and be located a plurality of temperature regulation wind spouts of platen superheater below, its characterized in that: the plurality of temperature-adjusting air nozzles are communicated with one path of air led out from the hot secondary air channel and/or the hot primary air channel by a bypass air channel, temperature-adjusting air boxes are arranged on the periphery of the boiler furnace with the temperature-adjusting air nozzles, the temperature-adjusting air boxes are matched with the boiler furnace to form chambers communicated with all the temperature-adjusting air nozzles on the corresponding sides, and the bypass air channel is communicated with the chambers in the temperature-adjusting air boxes.
Boiler high temperature heating face thermal deviation adjusting device, it hot secondary air duct links to each other with secondary air fan, hot primary air duct links to each other with primary air fan.
Boiler high temperature heating face thermal deviation adjusting device, its a plurality of wind spouts that adjust the temperature set up respectively at boiler furnace's front wall and/or back wall, and arrange along boiler furnace's width direction, the wind spout symmetrical arrangement or the staggered arrangement that adjust the temperature that set up on boiler furnace front and back wall.
Boiler high temperature heating face thermal deviation adjusting device, its the quantity of arranging of air conditioning spout is unanimous with the quantity of burner in the boiler furnace.
Boiler high temperature heating face thermal deviation adjusting device, its a plurality of wind spouts of adjusting temperature arrange with the burner that corresponds is listed as respectively.
Boiler high temperature heating face thermal deviation adjusting device, its the exit end of air spout that adjusts the temperature is tubaeform structure.
Boiler high temperature heating face thermal deviation adjusting device, it the wind spout of adjusting temperature can certain spout the angle of putting in vertical upwards swinging.
Boiler high temperature heating face thermal deviation adjusting device, it is in high temperature over heater and high temperature reheater have set gradually in the horizontal flue of boiler furnace dog-ear angle top the shaft flue after the horizontal flue in the boiler furnace is arranged with low temperature and receives the hot side.
Boiler high temperature heating face thermal deviation adjusting device, its every temperature regulation wind spout in the boiler furnace all is provided with control adjustment mechanism, the amount of wind of spouting into of every temperature regulation wind spout adjusts the temperature alone.
Boiler high temperature heating face thermal deviation adjusting device, its the wind spout of adjusting temperature comprises round spout and flow control valve, flow control valve is used for the control to correspond the jettison volume of spout.
The utility model discloses an arrange the temperature-adjusting wind, adjust local flue gas side temperature and reach the purpose that reduces the hot deviation of heating surface, effectively solve or obviously improve the wall temperature deviation, promote the reheat steam temperature to improve boiler operational parameter and unit efficiency, improve the economic benefits of power plant, assume to improve reheat steam temperature from 615 ℃ to 623 ℃, then can reduce the power supply coal consumption at least 0.15g kg g, and can guarantee the long-term safe operation of heating surface.
Drawings
FIG. 1 is a graph of boiler tube panel wall temperature distribution.
Fig. 2 is a schematic structural diagram of the present invention.
FIG. 3 is a cross-sectional view of a boiler furnace at a temperature-regulating air jet arrangement.
FIG. 4 is a schematic structural diagram of a temperature-adjusting air nozzle in a boiler furnace.
Fig. 5 is a schematic structural diagram of a temperature-adjusting air nozzle.
In the figure: the device comprises a boiler hearth 1, a screen superheater 2, a temperature adjusting air nozzle 3, a bypass air duct 4, a temperature adjusting air bellow 5, a secondary air fan 6, a primary air fan 7, a high-temperature superheater 8, a high-temperature reheater 9, a low-temperature heated surface 10, a burner 11, an air preheater 12, a pulverizing system 13, an air duct 14, a bellow 15, a circular nozzle 31 and a flow control valve 32.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention. It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.
As shown in fig. 2, 3 and 4, a thermal deviation adjusting device for a high-temperature heating surface of a boiler comprises a boiler furnace 1 and a plurality of temperature adjusting air nozzles 3 arranged in the boiler furnace 1 and below a screen superheater 2, wherein the temperature adjusting air nozzles are arranged below the screen superheater, the smoke temperature is relatively low, the local smoke temperature can be obviously reduced by mixing a small amount of temperature adjusting air, the screen cannot shake due to the kinetic energy of the temperature adjusting air, the temperature adjusting air nozzles 3 are respectively arranged on the front wall and/or the rear wall of the boiler furnace 1 and are arranged along the width direction of the boiler furnace 1 so as to respond to the change of the wall temperature high point, the temperature adjusting air nozzles 3 arranged on the front wall and the rear wall of the boiler furnace 1 are symmetrically arranged or staggered, the arrangement number of the temperature adjusting air nozzles 3 is consistent with the number of burners in the boiler furnace 1, the temperature adjusting air nozzles 3 are respectively arranged in the same row with the corresponding burners 11, a plurality of wind spouts that adjust temperature 3 lead to through bypass wind channel 4 and hot secondary air way and/or the wind channel bypass of heat all the way, hot secondary air way links to each other with secondary air fan 6, the wind channel of heat links to each other with primary air fan 7, is provided with the wind case 5 that adjusts the temperature in the 1 periphery of boiler furnace who arranges wind spout 3 that adjusts the temperature, the wind case 5 that adjusts the temperature forms and corresponds the cavity of all wind spouts 3 intercommunications that adjust the temperature of side with the 1 cooperation of boiler furnace, bypass wind channel 4 communicates with the cavity in the wind case 5 that adjusts the temperature.
The high-temperature superheater and the high-temperature reheater 9 are sequentially arranged in a horizontal flue above a flame folding angle of the boiler furnace 1, and a low-temperature heating surface 10 is arranged in a vertical shaft flue behind the horizontal flue in the boiler furnace 1.
As shown in fig. 4, each temperature-adjusting air nozzle 3 in the boiler furnace 1 is provided with a control adjusting mechanism, the temperature-adjusting air quantity injected from each temperature-adjusting air nozzle 3 is independently adjusted, specifically, the temperature-adjusting air nozzle 3 is composed of a circular nozzle 31 and a flow control valve 32, the flow control valve 32 is used for controlling the injection quantity of the corresponding nozzle, and the flow control valve can be remotely operated and adjusted in real time during operation; although more temperature-adjusting air nozzles are arranged, only two temperature-adjusting air nozzles are probably put into operation in most of the operation, the air quantity accounts for about 1% of the total air of the boiler, the smoke temperature of the area above the nozzles is reduced by about 50 ℃ before the nozzles are injected, even if the nozzles do not participate in combustion at all, the efficiency is reduced by only 0.05% (absolute value) due to the increase of the excess air coefficient, the power supply coal consumption is influenced by 0.15g/kg g, and the income brought by the increase of the steam temperature parameter is about 0.3g/kg g, so the overall income is realized.
As shown in fig. 5, in this embodiment, the exit end of the temperature-adjusting air nozzle 3 is of a horn-shaped structure to increase the spraying range of the temperature-adjusting air nozzle, and further, the temperature-adjusting air nozzle 3 can vertically swing upwards by a certain spraying angle, and the preferred swinging angle is 0-30 °, so that the temperature-adjusting air nozzle faces the area where high temperature is more easily formed, and the purpose of effective cooling is further achieved.
The utility model discloses use pi type stove as specific embodiment:
the primary air fan 7 and the secondary air fan 6 respectively send air into the air preheater 12 for heating, hot primary air is sent into the powder making system 13 and then enters the burner 11 together with pulverized coal, then enters the boiler furnace 1, hot secondary air enters the air box 15 through the air duct 14 and then is sent into the boiler furnace 1, and high-temperature flue gas is generated after the pulverized coal and the air are combusted in the furnace. A platen superheater 2 is arranged at the outlet of the hearth, a high-temperature superheater 8 and a high-temperature reheater 9 are respectively arranged in a horizontal flue above a flame folding angle, and a low-temperature heating surface 10 is arranged in a rear vertical shaft flue.
The method is characterized in that a hole is formed in an air duct 14, a bypass air duct 4 is arranged, one path of temperature-adjusting air is led out, the path of hot air is sprayed into a boiler hearth 1 through a temperature-adjusting air nozzle 3 arranged below a screen type superheater 2, and the hot air and flue gas are mixed and then flow to a high-temperature superheater 8 and a high-temperature reheater 9 in a horizontal flue and a low-temperature heating surface 10 in a rear vertical shaft flue and are exhausted through an air preheater 12.
The temperature-adjusting air firstly enters a temperature-adjusting air box 5 arranged outside the furnace wall, and then is sent into the furnace chamber through the temperature-adjusting air nozzles 3, the arrangement of a bypass air channel outside the furnace chamber of the boiler can be simplified through the arrangement of the temperature-adjusting air box, meanwhile, a pre-storage space is provided for the injection amount of each temperature-adjusting air nozzle, and the reliability and stability of the injection of the temperature-adjusting air are ensured.
The temperature-adjusting air nozzle 3 consists of a circular nozzle 31 and a flow control valve 32, the flow control valve 32 can be remotely operated, and when the wall temperature of a certain area of the high-temperature heating surface is higher, the nozzle valve of the corresponding area is remotely opened.
Taking a boiler with eight burners on each layer as an example, eight nozzles are arranged at the bottom of a screen, the distribution trend of thermal deviation among the screens in the width direction of a hearth is calculated according to wall temperature monitoring measuring points installed on a high-temperature reheater, it can be judged from the graph 1 that the wall temperature of A, B areas corresponding to the 2 nd and 7 th nozzles is high, the overtemperature risk is caused, the temperature of the whole reheated steam is influenced to be raised, the valves of the 2 nd and 7 th nozzles are opened remotely, and the temperature of flue gas in a temperature-adjusting air reduction A, B area is sent to reduce the wall temperature. When external conditions such as coal pulverizer combination, load, coal type change, wall temperature "high point" position is different, the utility model discloses just possible real-time regulation guarantees that the steam temperature all reaches the rated value at any time.
The utility model adopts the technical scheme that one path of air is led out from the internal heat secondary air duct or the heat primary air duct of the system for adjusting the temperature, the temperature of the boiler exhaust smoke is not influenced, the bottom of the screen superheater is provided with a temperature adjusting air nozzle along the width direction of the hearth, and the temperature adjusting air is sprayed into the hearth through the nozzle; each nozzle is provided with an adjusting mechanism, the sprayed temperature-adjusting air quantity can be independently adjusted, and temperature-adjusting air is sprayed to a wall temperature area of a heating surface during operation, so that the flue gas temperature of the area is reduced, and the aim of reducing the wall temperature of the area is fulfilled; the utility model discloses a train of thought is clear, and operator easy operation is nimble, and the regional removal of adaptation wall temperature high point that can be fine.
Taking a 1000Mg ultra-supercritical boiler as an example, the full-load total air volume of the boiler is 3180t/g, the designed over-fire air proportion is 35%, wherein the over-fire air proportion at the uppermost layer is 15%, the over-fire air nozzles at the uppermost layer are 16 in total, and the design flow of each nozzle is as follows: 3180 × 0.15/16 ═ 29.8 t/g. In the design operation, the wall temperature deviation of the heating surface along the width direction of the hearth can be effectively adjusted by adjusting the proportion of the over-fire air.
The mode that the overfire air was adjusted has been consulted to this scheme, is on the basis of the mode is adjusted to the overfire air, has further improved flexibility, the rapidity of adjusting, and two spouts are put into operation during this scheme design, and single nozzle volume is: 3180 × 0.01/2 is 15.9t/g, which is more direct with respect to the effect of the over-fire air due to the arrangement in the large screen area.
Also can set up air regulation to automatic, the spout that needs the regulation is found out automatically according to the heating surface wall temperature deviation to the computer, specifically is: firstly, dividing a tube panel into left and right areas according to the width of a hearth, wherein the number of the areas is the same as that of nozzles; secondly, finding out the area where the pipe with high wall temperature is located; and finally, opening a nozzle valve in the area to increase the air quantity.
The above description is only for the preferred embodiment of the present invention and should not be taken as limiting the invention, and any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention should be included within the protection scope of the present invention.
Claims (10)
1. The utility model provides a boiler high temperature heating face thermal deviation adjusting device, includes boiler furnace (1) and arranges in boiler furnace (1) and be located a plurality of temperature regulation wind spout (3) of platen superheater (2) below, its characterized in that: a plurality of wind spouts that adjust the temperature (3) lead to each other through bypass wind channel (4) and hot secondary wind channel and/or hot primary wind channel bypass all the way wind of drawing, is provided with wind bellows (5) that adjust the temperature in boiler furnace (1) periphery of arranging wind spout (3) that adjust the temperature, wind bellows (5) that adjust the temperature cooperate with boiler furnace (1) to form and correspond the chamber of all wind spouts (3) intercommunications that adjust the temperature of side, bypass wind channel (4) and the interior chamber intercommunication of wind bellows (5) that adjust the temperature.
2. The device for adjusting the thermal deviation of the high-temperature heated surface of the boiler according to claim 1, wherein: the hot secondary air duct is connected with a secondary fan (6), and the hot primary air duct is connected with a primary fan (7).
3. The device for adjusting the thermal deviation of the high-temperature heated surface of the boiler according to claim 1, wherein: the temperature-adjusting air nozzles (3) are respectively arranged on the front wall and/or the rear wall of the boiler furnace (1) and are arranged along the width direction of the boiler furnace (1), and the temperature-adjusting air nozzles (3) arranged on the front wall and the rear wall of the boiler furnace (1) are symmetrically arranged or arranged in a staggered manner.
4. The device for adjusting the thermal deviation of the high-temperature heated surface of the boiler according to claim 1, wherein: the arrangement quantity of the temperature adjusting air nozzles (3) is consistent with that of the burners (11) in the boiler hearth (1).
5. The device for adjusting the thermal deviation of the high-temperature heated surface of the boiler according to claim 4, wherein: the temperature adjusting air nozzles (3) are respectively arranged in the same row with the corresponding burner (11).
6. The device for adjusting the thermal deviation of the high-temperature heated surface of the boiler according to claim 1, wherein: the outlet end of the temperature adjusting air nozzle (3) is of a horn-shaped structure.
7. The device for adjusting the thermal deviation of the high-temperature heated surface of the boiler according to claim 1, wherein: the temperature-adjusting air nozzle (3) can vertically swing upwards for a certain spraying angle.
8. The device for adjusting the thermal deviation of the high-temperature heated surface of the boiler according to claim 1, wherein: a high-temperature superheater (8) and a high-temperature reheater (9) are sequentially arranged in a horizontal flue above a flame folding angle of the boiler furnace (1), and a low-temperature heating surface (10) is arranged in a vertical shaft flue behind the horizontal flue in the boiler furnace (1).
9. The device for adjusting the thermal deviation of a high-temperature heated surface of a boiler according to any one of claims 1 to 8, wherein: each temperature adjusting air nozzle (3) in the boiler furnace (1) is provided with a control adjusting mechanism, and the sprayed temperature adjusting air quantity of each temperature adjusting air nozzle (3) is independently adjusted.
10. The device for adjusting the thermal deviation of a high-temperature heated surface of a boiler according to claim 9, wherein: the temperature-adjusting air nozzle (3) consists of a circular nozzle (31) and a flow control valve (32), and the flow control valve (32) is used for controlling the injection amount of the corresponding nozzle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220648587.7U CN217154150U (en) | 2022-03-22 | 2022-03-22 | Boiler high temperature heating surface thermal deviation adjusting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220648587.7U CN217154150U (en) | 2022-03-22 | 2022-03-22 | Boiler high temperature heating surface thermal deviation adjusting device |
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| Publication Number | Publication Date |
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| CN217154150U true CN217154150U (en) | 2022-08-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220648587.7U Active CN217154150U (en) | 2022-03-22 | 2022-03-22 | Boiler high temperature heating surface thermal deviation adjusting device |
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| CN (1) | CN217154150U (en) |
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- 2022-03-22 CN CN202220648587.7U patent/CN217154150U/en active Active
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