CN217952265U - Primary air secondary heating system for improving stable combustion capacity of circulating fluidized bed boiler - Google Patents
Primary air secondary heating system for improving stable combustion capacity of circulating fluidized bed boiler Download PDFInfo
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- CN217952265U CN217952265U CN202220486850.7U CN202220486850U CN217952265U CN 217952265 U CN217952265 U CN 217952265U CN 202220486850 U CN202220486850 U CN 202220486850U CN 217952265 U CN217952265 U CN 217952265U
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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
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
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Abstract
The utility model provides an improve a wind second grade heating system of steady ability of firing of circulating fluidized bed boiler, wind second grade heating system is including consecutive wind one-level preheating device and wind second grade preheating device, wind one-level preheating device sets up in the flue, wind second grade preheating device sets up in wind way is once hot. The primary air secondary heating system heats primary air to 350-400 ℃, effectively improves the stable combustion performance of the boiler under low load, improves the fuel combustion efficiency under low load, does not influence the arrangement of the heating surface of a hearth, and is suitable for deep peak regulation transformation of the conventional circulating fluidized bed boiler.
Description
Technical Field
The utility model relates to a circulating fluidized bed boiler technical field especially relates to an improve a wind second grade heating system of circulating fluidized bed boiler steady burning ability.
Background
With the increasing increase of the installed capacity of fluctuating renewable energy sources mainly based on wind power and photovoltaic, the problem of insufficient peak regulation capability of a power system is more prominent, and thermal power generating units face heavier peak regulation tasks. Most of the existing thermal power generating units are designed according to basic load, the load can exceed the basic peak regulation range during deep peak regulation and even is lower than the lowest stable combustion load of a power plant boiler, potential safety hazards such as boiler flameout and the like can be caused, and the operation requirement of deep peak regulation cannot be completely met, so that the improvement of the stable combustion performance of the boiler under low load is the primary link for improving the deep peak regulation capability of the boiler.
The dense-phase region at the lower part of the hearth of the circulating fluidized bed boiler is filled with glowing materials, plays a role of a heat storage pool, and is a stable ignition heat source, so that the circulating fluidized bed boiler has more excellent low-load stable combustion performance than a pulverized coal furnace.
However, in design and actual operation, the temperature of the hot primary air is generally lower, usually between 230 ℃ and 280 ℃ under rated load, even lower than 200 ℃, and lower under the working condition of the lowest stable combustion load, which seriously affects the play of the low-load stable combustion performance advantages of the circulating fluidized bed boiler: at 30% of the maximum continuous evaporation load of the boiler, the bed temperature in the dense phase zone is reduced to the critical point which can only maintain the stable ignition and combustion of the fuel, and the deep peak regulation at lower load can not be realized.
Therefore, the development of a primary air secondary heating system for improving the stable combustion capacity of the circulating fluidized bed boiler so as to improve the primary air heating temperature is the key for improving the low-load stable combustion capacity of the circulating fluidized bed boiler.
SUMMERY OF THE UTILITY MODEL
In view of the problem that exists among the prior art, the utility model provides an improve a wind second grade heating system of circulating fluidized bed boiler steady burning ability improves the temperature of a wind to 350 ~ 400 ℃ by original 200 ~ 250 ℃, and this higher temperature's a wind can effectively improve circulating fluidized bed boiler's dense phase bed temperature, increases substantially circulating fluidized bed boiler's low-load steady burning ability and fuel combustion efficiency.
To achieve the purpose, the utility model adopts the following technical proposal:
the utility model provides an improve a wind second grade heating system of circulating fluidized bed boiler steady burning ability, a wind second grade heating system is including consecutive a wind one-level preheating device and a wind second grade preheating device, a wind one-level preheating device sets up in the flue, a wind second grade preheating device sets up in wind channel is given one's place to hot.
A wind second grade heating system of improvement circulating fluidized bed boiler surely ability be one set of device system, this system at first heats 280 ~ 300 ℃ with a wind in the one-level preheating device, then further heats 350 ~ 400 ℃ in the second grade preheating device, gets into furnace at last. Compared with primary wind of 200-250 ℃ under low load in the prior art, the primary wind energy of 350-400 ℃ obviously improves the bed temperature of the dense phase region under low load, so that the minimum stable combustion load of the circulating fluidized bed boiler can be reduced to 20% of rated load, the stable operation of the circulating fluidized bed boiler under lower load is ensured, the deep peak regulation capability is enhanced, the temperature level of a hearth under low load is improved, and the full-load selective non-catalytic reduction denitration is favorably realized.
Improve a wind second grade heating system of steady burning ability of circulating fluidized bed boiler and do not influence current furnace and receive the hot side and arrange, only need adjust economizer and preheating device's arrangement and structure, be suitable for the degree of depth peak regulation transformation of current circulating fluidized bed boiler.
Preferably, an air volume adjusting baffle is arranged in the primary hot air duct and used for adjusting and controlling the air volume entering the primary air secondary preheating device.
The air quantity adjusting baffle of the utility model is adjusted to be in a full-closed state when the circulating fluidized bed boiler is under low load, so as to ensure the temperature of hot air; and the circulating fluidized bed boiler is adjusted to be in a full-open state when in high load, so that the overtemperature of a bed layer is avoided.
Preferably, the primary air primary preheating device comprises a tubular air heat exchanger or a rotary air heat exchanger.
Preferably, a primary air heater is arranged in front of the primary air primary preheating device.
The temperature of a wind can be further improved to a wind fan heater.
Preferably, the primary air secondary preheating device comprises a steam/air heat exchanger or a molten salt/air heat exchanger.
The steam/air heat exchanger of the utility model is characterized in that two media, namely steam and air, exchange heat in the heat exchanger; the molten salt/air heat exchanger is represented by a heat exchange between two media, namely molten salt and air in the heat exchanger.
The steam heat source in the steam/air heat exchanger of the present invention may also be provided by medium temperature reheat steam.
Preferably, the steam/air heat exchanger is disposed within a steam/air heat exchange device system.
Preferably, the steam/air heat exchange device system further comprises a cladding superheater, a low-temperature superheater, a platen superheater and a final superheater.
Preferably, the cladding superheater, the low-temperature superheater, the platen superheater, the steam/air heat exchanger and the finishing superheater are connected in sequence along the steam flow direction.
The utility model discloses a low temperature over heater is the technical name known in the art, and the low temperature steam that heats in the low temperature over heater, its temperature is close to saturation temperature; the low-temperature overheating heats the saturated steam into the superheated steam, and the main effects are to reduce the loss of smoke discharge and improve the thermal efficiency of the boiler.
Preferably, the molten salt/air heat exchanger is disposed within a molten salt/air heat exchange device system.
Preferably, the molten salt/air heat exchange device system further comprises a molten salt storage device, a molten salt conveying device, a molten salt control device and a molten salt/flue gas heat exchanger.
Preferably, the molten salt storage device, the molten salt conveying device, the molten salt control device, the molten salt/flue gas heat exchanger and the molten salt/air heat exchanger are sequentially connected in a circulating manner.
The fused salt that comes from fused salt storage device among the fused salt air heat transfer device system is sent into fused salt flue gas heat exchanger through fused salt conveyor and is absorbed heat in, and it is exothermic to go into fused salt air heat exchanger after the fused salt temperature reaches 450 ~ 480 ℃, will further heat 350 ~ 400 ℃ through the air after the one-level preheating device heating, and the fused salt is got back to fused salt storage device after being cooled off, realizes the circulation of heat carrier fused salt.
Preferably, the molten salt/flue gas heat exchanger is disposed within a flue.
Preferably, the molten salt/flue gas heat exchange device and the economizer are connected in sequence along the flow direction of flue gas.
Fused salt gas heater need carry out the heat transfer with the high temperature flue gas, consequently along the flue gas flow direction, fused salt gas heater is the setting before the economizer. When the existing circulating fluidized bed boiler is transformed, the position of the economizer needs to be moved downwards, and a certain space is provided for the fused salt/flue gas heat exchanger.
Compared with the prior art, the utility model discloses following beneficial effect has at least:
(1) The primary air secondary heating system for improving the stable combustion capacity of the circulating fluidized bed boiler, provided by the utility model, improves the primary air temperature under low load to 350-400 ℃, improves the deep peak regulation capacity of the circulating fluidized bed boiler, and reduces the minimum stable combustion load of the circulating fluidized bed boiler to 20% of rated load;
(2) The primary air secondary heating system for improving the stable combustion capacity of the circulating fluidized bed boiler, which is provided by the utility model, improves the temperature of primary air under low load to 350-400 ℃, and improves the combustion efficiency of fuel under low load; but also improves the temperature level of the hearth under low load, and is beneficial to realizing full-load selective non-catalytic reduction denitration.
Drawings
FIG. 1 is a schematic view of a primary air secondary heating system for improving the stable combustion capability of a circulating fluidized bed boiler provided in example 1.
FIG. 2 is a schematic view of a primary air secondary heating system for improving the stable combustion capability of a circulating fluidized bed boiler provided in example 2.
FIG. 3 is a schematic diagram of a molten salt/air heat exchange apparatus system provided in example 2.
In the figure: 1-a tubular air heat exchanger; 2-secondary air preheating device; 3-a steam/air heat exchanger; 4-air volume adjusting baffle; 5-a coal economizer; 6-hot primary air duct; 7-an air chamber; 8-secondary air duct; 9-tail heating surface; 10-a dense-phase zone of the furnace; 11-rotary air heat exchanger; 12-molten salt/air heat exchanger; 13-a molten salt storage device; 14-a molten salt delivery device; 15-molten salt control means; 16-molten salt/flue gas heat exchanger.
Detailed Description
The technical solution of the present invention is further explained by the following embodiments with reference to the drawings.
The present invention will be described in further detail below. However, the following examples are only simple examples of the present invention, and do not represent or limit the scope of the present invention, which is defined by the appended claims.
It is to be understood that in the description of the present invention, the terms "central," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings for the purpose of convenience and simplicity of description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
It should be noted that, unless explicitly stated or limited otherwise, the terms "disposed," "connected" and "connected" in the description of the present invention are to be construed broadly, and may for example be fixedly connected, detachably connected or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
It should be understood that the technical personnel in the field should understand that the utility model discloses in must include the necessary pipeline, conventional valve and the general pump equipment that are used for realizing the technology is complete, nevertheless do not belong to the utility model discloses a main utility model point, technical personnel in the field can advance to add the overall arrangement by oneself based on technological process and equipment structure lectotype, the utility model discloses do not do special requirement and specific limit to this.
Example 1
The embodiment provides a primary air secondary heating system for improving the stable combustion capacity of a circulating fluidized bed boiler, and a schematic diagram of the primary air secondary heating system is shown in fig. 1.
The primary air secondary heating system comprises a tubular air heat exchanger 1 and a steam/air heat exchanger 3 which are sequentially connected, wherein the tubular air heat exchanger 1 is arranged in a flue, and the steam/air heat exchanger 3 is arranged in a primary hot air duct 6.
And an air volume adjusting baffle 4 is arranged in the primary hot air duct 6 and is used for adjusting and controlling the air volume entering the steam/air heat exchanger 3.
The hot primary air duct 6 is connected with an air chamber 7 at the bottom of the circulating fluidized bed boiler, and the upper part of the air chamber 7 is a hearth dense-phase region 10.
In the figure 1, a tail heating surface 9, an economizer 5 and a secondary air preheating device 2 are further arranged in a flue of the circulating fluidized bed boiler along the flow direction of flue gas, and the secondary air preheating device 2 is connected with the circulating fluidized bed boiler through a secondary air duct 8.
The heat source of the steam/air heat exchanger 3 is provided by medium temperature superheated steam. The steam/air heat exchanger 3 is arranged in a steam/air heat exchange device system.
Example 2
The embodiment provides a primary air secondary heating system for improving the stable combustion capacity of a circulating fluidized bed boiler, and a schematic diagram of the primary air secondary heating system is shown in fig. 2.
The primary air secondary heating system comprises a rotary air heat exchanger 11 and a molten salt/air heat exchanger 12 which are sequentially connected, wherein the rotary air heat exchanger 11 is arranged in a flue, and the molten salt/air heat exchanger 12 is arranged in the primary hot air duct 6.
And an air volume adjusting baffle 4 is arranged in the primary hot air duct 6 and is used for adjusting and controlling the air volume entering the fused salt/air heat exchanger 12.
The hot primary air duct 6 is connected with an air chamber 7 at the bottom of the circulating fluidized bed boiler, and the upper part of the air chamber 7 is a hearth dense-phase zone 10.
In the fig. 2, a tail heating surface 9, an economizer 5 and a secondary air preheating device 2 are further arranged in a flue of the circulating fluidized bed boiler along the flow direction of flue gas, and the secondary air preheating device 2 is connected with the circulating fluidized bed boiler through a secondary air duct 8.
The molten salt/air heat exchanger 12 is disposed within a molten salt/air heat exchanger system, a schematic diagram of which is shown in fig. 3.
The molten salt/air heat exchange device system further comprises a molten salt storage device 13, a molten salt conveying device 14, a molten salt control device 15 and a molten salt/flue gas heat exchanger 16; the molten salt storage device 13, the molten salt conveying device 14, the molten salt control device 15, the molten salt/flue gas heat exchanger 16 and the molten salt/air heat exchanger 12 are sequentially connected in a circulating manner. The fused salt/flue gas heat exchanger 16 is arranged in the flue, and the fused salt/flue gas heat exchanger 16 and the economizer 5 are sequentially connected along the flow direction of flue gas.
In the embodiments 1-2, the primary air secondary heating system for improving the stable combustion capability of the circulating fluidized bed boiler first heats primary air to 280-300 ℃ in the primary preheating device, then further heats the primary air to 350-400 ℃ in the secondary preheating device, and improves the bed temperature of the dense phase region at the time of low load, so that the minimum stable combustion load of the circulating fluidized bed boiler can be reduced to 20% of the rated load, and the stable operation of the circulating fluidized bed boiler at a lower load is ensured.
To sum up, the utility model provides an improve a wind second grade heating system of steady ability of firing of circulating fluidized bed boiler can effectively improve the steady performance of firing under the boiler low-load, has improved the fuel combustion efficiency under the low-load and has not influenced furnace and receive the hot side and arrange, is suitable for the degree of depth peak regulation transformation of current circulating fluidized bed boiler.
The applicant states that the above description is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and those skilled in the art should understand that any changes or substitutions easily conceivable by those skilled in the art within the technical scope of the present invention are within the protection scope and the disclosure scope of the present invention.
The above detailed description describes the preferred embodiments of the present invention, however, the present invention is not limited to the specific details of the above embodiments, and the technical concept of the present invention can be modified to various simple modifications, and these simple modifications all belong to the protection scope of the present invention.
It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and in order to avoid unnecessary repetition, the present invention does not need to describe any combination of the features.
Claims (10)
1. The utility model provides an improve a wind second grade heating system of circulating fluidized bed boiler steady burning ability which characterized in that, a wind second grade heating system is including consecutive wind one-level preheating device and a wind second grade preheating device, a wind one-level preheating device sets up in the flue, a wind second grade preheating device sets up in wind channel is once hot.
2. The primary air secondary heating system for improving the stable combustion capability of the circulating fluidized bed boiler as claimed in claim 1, wherein an air volume adjusting baffle is arranged in the primary hot air duct for adjusting and controlling the air volume entering the primary hot air secondary preheating device.
3. The primary air secondary heating system for improving the stable combustion capability of the circulating fluidized bed boiler according to claim 1, wherein the primary air primary preheating device comprises a tubular air heat exchanger or a rotary air heat exchanger.
4. The primary air secondary heating system for improving the stable combustion capability of the circulating fluidized bed boiler according to claim 1, wherein a primary air heater is arranged in front of the primary air primary preheating device.
5. The primary air secondary heating system for improving the stable combustion capability of the circulating fluidized bed boiler according to claim 1, wherein the primary air secondary preheating device comprises a steam/air heat exchanger or a molten salt/air heat exchanger.
6. The primary air secondary heating system for improving the stable combustion capability of the circulating fluidized bed boiler according to claim 5, wherein the steam/air heat exchanger is arranged in a steam/air heat exchange device system.
7. The primary air secondary heating system for improving the stable combustion capability of the circulating fluidized bed boiler according to claim 6, wherein the steam/air heat exchange device system further comprises a cladding superheater, a low-temperature superheater, a platen superheater and a final superheater;
the coating superheater, the low-temperature superheater, the platen superheater, the steam/air heat exchanger and the final superheater are sequentially connected along the steam flowing direction.
8. The primary air secondary heating system for improving the stable combustion capability of the circulating fluidized bed boiler according to claim 5, wherein the molten salt/air heat exchanger is arranged in a molten salt/air heat exchange device system.
9. The primary air secondary heating system for improving the stable combustion capacity of the circulating fluidized bed boiler according to claim 8, wherein the molten salt/air heat exchange device system further comprises a molten salt storage device, a molten salt conveying device, a molten salt control device and a molten salt/flue gas heat exchanger;
the molten salt storage device, the molten salt conveying device, the molten salt control device, the molten salt/flue gas heat exchanger and the molten salt/air heat exchanger are sequentially connected in a circulating mode.
10. The primary air secondary heating system for improving the stable combustion capability of the circulating fluidized bed boiler according to claim 9, wherein the molten salt/flue gas heat exchanger is arranged in a flue;
the fused salt/flue gas heat exchange device and the economizer are sequentially connected along the flow direction of flue gas.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220486850.7U CN217952265U (en) | 2022-03-08 | 2022-03-08 | Primary air secondary heating system for improving stable combustion capacity of circulating fluidized bed boiler |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220486850.7U CN217952265U (en) | 2022-03-08 | 2022-03-08 | Primary air secondary heating system for improving stable combustion capacity of circulating fluidized bed boiler |
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| CN217952265U true CN217952265U (en) | 2022-12-02 |
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| CN202220486850.7U Active CN217952265U (en) | 2022-03-08 | 2022-03-08 | Primary air secondary heating system for improving stable combustion capacity of circulating fluidized bed boiler |
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