CN214501207U - System for improving comprehensive performance of deep peak shaving of circulating fluidized bed boiler - Google Patents
System for improving comprehensive performance of deep peak shaving of circulating fluidized bed boiler Download PDFInfo
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- CN214501207U CN214501207U CN202023195718.0U CN202023195718U CN214501207U CN 214501207 U CN214501207 U CN 214501207U CN 202023195718 U CN202023195718 U CN 202023195718U CN 214501207 U CN214501207 U CN 214501207U
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- 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 utility model discloses a system for improve circulating fluidized bed boiler degree of depth peak shaving comprehensive properties belongs to circulating fluidized bed boiler's technical field, including the boiler with connect in the female pipe of the main steam of boiler and the female pipe of reheat steam, this system includes: the system comprises an air heating device, a heat exchanger and a heat exchanger, wherein the air heating device is provided with a pipeline I and a pipeline II for heat exchange, one end of the pipeline I is connected to a hot primary air outlet of an air preheater in the boiler, and the other end of the pipeline I is connected to a hot air pipeline of a primary air box in the boiler; one end of the pipeline II is connected with a steam inlet header, and the other end of the pipeline II is connected with a drainage component; the valve group, steam inlet collection case is connected to main steam pipe and/or the main pipe of reheat steam through the valve group to reach the unit characteristic when combining the power plant degree of depth peak shaving, from the whole thermodynamic system angle of power plant, with the purpose of comprehensive properties such as security, economic nature and the feature of environmental protection of boiler when improving degree of depth peak shaving.
Description
Technical Field
The utility model belongs to the technical field of circulating fluidized bed boiler, particularly, relate to a system for improving circulating fluidized bed boiler degree of depth peak shaving comprehensive properties.
Background
In recent years, new energy power generation such as wind power and photovoltaic has been vigorously developed. After 2020, wind and photovoltaic installations will increase further. While new energy sources such as wind power and photovoltaic energy are continuously and rapidly developed, the absorption situation of the wind power and the photovoltaic energy is influenced by various factors and will become severe in the future. How to consume the electric quantity of the new energy becomes a key factor for restricting the development of the new energy in China.
On the other hand, the newly-increased thermal power generating machines in the whole country in the previous years are developed too fast, and the power generation utilization of the active thermal power generating units is greatly reduced. In the near future, the thermal power plant develops flexibility transformation as early as possible, can ensure that a unit is on line preferentially, avoids apportionment cost, and obtains considerable peak regulation subsidy income by participating in deep peak regulation. In the long term, in a competitive power market of a new power supply and demand environment, the number of thermal power utilization hours can be kept at a low level for a long time, and the roles of partial thermal power base charge power supplies are changed. The thermal power plant needs to adjust output according to the flexibility of price fluctuation in the market, the flexibility transformation tends to be great, the thermal power plant is beneficial to adapting to the electric power marketization process, and the thermal power plant with deep peak regulation capability can benefit first.
And the actual operation condition of the boiler deep peak shaving will deviate from the rated working condition seriously. For a circulating fluidized bed boiler, when the load of the boiler is low to a certain degree, the temperature of a bed in the boiler becomes low, for example, the temperature of the bed is about 750-840 ℃ when a 300MW subcritical CFB unit is under 30% load, the stable combustion characteristic in the boiler becomes poor, and potential safety hazards of combustion exist; the combustion efficiency in the furnace is low, the burnout is not good, and the carbon content of ash slag is high; the steam temperature is seriously insufficient, and the efficiency of a boiler and a unit is low; simultaneously, the temperature of the smoke at the inlet of the cyclone separator is greatly reduced, such as: about 620 ~ 720 ℃ of separator entry gas temperature when 300MW subcritical CFB unit 30% load can cause the stove in desulfurization efficiency not high, and SNCR denitration device deviates from suitable denitration reaction temperature interval, and denitration inefficiency leads to realizing ultralow emission cost height, is difficult to satisfy the environmental protection requirement of ultralow emission even, and the boiler can't continue safe economic operation again.
Regarding the deep peak regulation technology of the circulating fluidized bed boiler, there is a patent for realizing better peak regulation performance index by adopting a certain technical means. For example, patent CN110566943A discloses a high temperature flue gas recirculation system for denitration control during peak shaving; patent CN111023086A is connected in series with each other by the electric system of unit system to ensure the benefit maximization during the unit fire suppression period.
However, in the prior art, certain technical measures are not considered from the overall thermodynamic system of the unit for improving the comprehensive performances of the boiler such as the safety, the economy, the environmental protection and the like during deep peak shaving.
SUMMERY OF THE UTILITY MODEL
In view of this, in order to solve the above-mentioned problem that prior art exists, the utility model aims at providing a system for improving circulating fluidized bed boiler degree of depth peak shaving comprehensive properties is in order to reach the unit characteristic when combining the degree of depth peak shaving of power plant, from the whole thermodynamic system of power plant's perspective, with the purpose of improving comprehensive properties such as security, economic nature and the feature of environmental protection of boiler when degree of depth peak shaving.
The utility model discloses the technical scheme who adopts does: a system for improving the comprehensive performance of deep peak shaving of a circulating fluidized bed boiler comprises a boiler and a main steam main pipe and a reheat steam main pipe which are connected with the boiler, and the system comprises:
the system comprises an air heating device, a heat exchanger and a heat exchanger, wherein the air heating device is provided with a pipeline I and a pipeline II for heat exchange, one end of the pipeline I is connected to a hot primary air outlet of an air preheater in the boiler, and the other end of the pipeline I is connected to a hot air pipeline of a primary air box in the boiler; one end of the pipeline II is connected with a steam inlet header, and the other end of the pipeline II is connected with a drainage component;
the steam inlet header is connected to the main steam main pipe and/or the reheat steam main pipe through the valve group;
the hot primary air temperature of the boiler during peak load regulation can be improved, so that the overall temperature level in the boiler hearth can be improved, and the comprehensive performance of deep peak regulation of the boiler can be improved.
Further, the valve set is independently connected to the main steam main pipe through a steam guide tee joint, and the main steam is used as a heat source for heating air.
Further, the valve set is separately connected to a reheat steam main pipe through a steam guide tee joint, and reheat steam is used as a heat source for heating air.
Furthermore, the valve group is provided with two valves, the two valve groups are respectively connected to the main steam pipe and the reheat steam pipe through the steam guide tee joint, and the reheat steam and the main steam are coupled to be used as a heat source for heating air, so that the selectivity of the system to a high-temperature steam source is improved.
Further, valve group is including the check valve, gate valve, electric gate valve, electrical control valve and the relief pressure valve that connect gradually, the check valve with draw vapour three-way connection, and the relief pressure valve with steam inlet header connects to control high temperature steam and get into air heating device's flow, and then the heat transfer volume among the control air heating device, with the hot primary air temperature after the regulation is heated.
Furthermore, the drainage assembly comprises a drainage header and a drainage flash tank, one end of the drainage header is connected to the pipeline II, the other end of the drainage header is connected to the drainage flash tank, and steam after heat release is changed into a saturated steam-water mixture and is connected to the drainage header for collection.
Furthermore, the drainage flash tank is connected to the condenser, and is finally sent to the condenser of the power plant after being processed by the drainage flash tank.
Furthermore, the air heating device is arranged on a hot primary air pipeline of the boiler and adopts a surface heater, the design of the air heating device can be flexibly designed in various modes such as concurrent flow and countercurrent flow, staggered arrangement and sequential arrangement, light tubes and fin reinforced heat exchange tubes and the like according to the requirements of factors such as heat exchange quantity, temperature and the like, and the material can be designed and selected according to the steam temperature and the wall temperature condition of the heat exchange tubes.
The utility model has the advantages that:
1. by adopting the system for improving the comprehensive performance of the deep peak shaving of the circulating fluidized bed boiler, the hot primary air temperature of the circulating fluidized bed boiler during deep peak shaving load is improved by additionally arranging the air heating device and utilizing the coupling of the main steam, the reheat steam or the reheat steam and the main steam for heat exchange, so that the bed temperature in the boiler during low load is improved; on one hand, the improvement of the bed temperature in the boiler is beneficial to the ignition and stable combustion characteristics of the boiler during deep peak shaving, improves the combustion and desulfurization efficiency, promotes the SNCR denitration chemical reaction, and improves the comprehensive performance of the deep peak shaving of the boiler in the aspects of safety, economy, environmental protection and the like; on the other hand, the heat source for heating air extracts steam from the reheated steam and/or the main steam pipeline, so that thermoelectric decoupling of the unit is achieved, and the method has important significance for more deep peak regulation subsidies of power generation enterprises.
Drawings
FIG. 1 is a schematic diagram of a conventional thermodynamic system;
FIG. 2 is a system diagram of the system for improving the comprehensive performance of deep peak shaving of the circulating fluidized bed boiler provided by the utility model in the embodiment 1;
FIG. 3 is a system diagram of the system for improving the comprehensive performance of deep peak shaving of the circulating fluidized bed boiler provided by the utility model in the embodiment 2;
FIG. 4 is a system diagram of the system for improving the comprehensive performance of deep peak shaving of the circulating fluidized bed boiler provided by the utility model in the embodiment 3;
FIG. 5 is a schematic structural view of an air heating apparatus in the system for improving the comprehensive performance of deep peak shaving of the circulating fluidized bed boiler provided by the present invention;
the drawings are labeled as follows:
1-boiler, 2-steam turbine, 3-generator, 4-steam guide tee joint, 5-check valve, 6-gate valve, 7-electric gate valve, 8-electric regulating valve, 9-reducing valve, 10-steam inlet header, 11-air heating device, 12-drainage header and 13-drainage flash tank.
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.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the embodiments of the present invention, it should be noted that the indication of the position or the positional relationship is based on the position or the positional relationship shown in the drawings, or the position or the positional relationship that the utility model is usually placed when using, or the position or the positional relationship that the skilled person conventionally understands, or the position or the positional relationship that the utility model is usually placed when using, and is only for the convenience of describing the present invention and simplifying the description, but does not indicate or suggest that the indicated device or element must have a specific position, be constructed and operated in a specific position, and thus, cannot be understood as limiting the present invention. Furthermore, the terms "first" and "second" are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.
In the description of the embodiments of the present invention, it should be further noted that unless otherwise explicitly stated or limited, the terms "disposed" and "connected" should be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present invention can be understood in specific cases for a person of ordinary skill in the art; the drawings in the embodiments are provided to clearly and completely describe the technical solutions in the embodiments of the present invention, and it is obvious that the described embodiments are some, 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.
As shown in fig. 1, a conventional thermodynamic system includes: boiler 1, steam turbine 2 and generator 3, boiler 1 communicates to steam turbine 2 through main steam main pipe and reheat steam main pipe, and steam turbine 2 does work and rotates in order to drive generator 3 and rotate the electricity generation. In a thermal power plant, chemical energy of fossil fuel is converted into thermal energy of steam in a boiler 1, and the thermal energy of the steam is converted into mechanical energy of high-speed rotation of a turbine 2 in the turbine 2, and the mechanical energy is converted into electric energy by a generator 3 and output. Wherein, the boiler 1 includes a furnace, a primary wind box, a cyclone separator and an air preheater, and the connection relationship and the working principle of each component part belong to the common knowledge, and are not described herein again.
When the traditional thermodynamic system deeply peak-shaving the circulating fluidized bed boiler 1, the hearth bed temperature in the boiler 1 is greatly reduced compared with the rated load, so that the combustion stability in the boiler is poor; meanwhile, the low bed temperature affects the combustion efficiency in the boiler, the incomplete mechanical combustion loss and the incomplete chemical combustion loss are increased, the steam temperature of the boiler 1 is insufficient, and the unit efficiency is low; in addition, in-furnace SNCR equipment cannot operate efficiently, and NOx emissions often have difficulty meeting environmental requirements. If the 300MW subcritical CFB unit is under 30% load, the bed temperature is about 750-840 ℃, the separator inlet smoke temperature is about 620-720 ℃, the combustion efficiency and denitration efficiency in the boiler are low, and when the deep peak regulation is carried out, the boiler 1 has the problems of poor stable combustion characteristic, poor economical efficiency, difficult achievement of environmental protection indexes and the like.
Based on the following embodiment, the unit characteristic when combining the power plant degree of depth peak regulation, from the whole thermodynamic system of power plant's angle, comprehensive properties such as security, economic nature and the feature of environmental protection of boiler 1 when can improve degree of depth peak regulation simultaneously, is favorable to the power plant to realize thermoelectric decoupling zero, acquires more degree of depth peak regulation subsidies and economic benefits.
Example 1
The system for improving the comprehensive performance of the deep peak shaving of the circulating fluidized bed boiler 1 is specifically provided in the embodiment, the temperature of a hearth in the boiler 1 can be improved, the problems that the NOx index caused by difficult stable combustion, poor economical efficiency and low SNCR (selective non-catalytic reduction) efficiency cannot meet the environmental protection requirement and the like during deep peak shaving are solved, and then the comprehensive performance of the deep peak shaving of the boiler 1 is improved, and the system further comprises the following components on the basis of a traditional thermodynamic system: the air heating device 11 and the valve set are added, as shown in fig. 2, and are specifically designed as follows:
air heating device 11
A pipeline I and a pipeline II for heat exchange are arranged in the air heating device 11, the schematic heat exchange diagram of the air heating device 11 is shown in figure 5, and hot primary air is heated through high-temperature steam. The air heating device 11 is arranged on a hot primary air pipeline of the boiler 1, compared with a traditional air heater system arranged on a cold air pipeline, the temperature of the hot primary air entering a primary air box after being heated is not limited by the temperature of smoke at the inlet of an air preheater, and the comprehensive performance of the boiler 1 during peak regulation is improved; the air heating device 11 adopts a surface heater, and the design can be flexibly designed in various modes such as concurrent flow, countercurrent flow, staggered arrangement, sequential arrangement, light tubes and fin reinforced heat exchange tubes and the like according to the requirements of factors such as heat exchange quantity, temperature and the like, and the material can be designed and selected according to the steam temperature and the wall temperature condition of the heat exchange tubes.
The one end of pipeline I is connected to the export of the hot primary air of air preheater in boiler 1, and the other end of pipeline I is connected to the hot-air pipeline of the primary air box in boiler 1, will improve the hot-blast temperature of sending into the primary air box through air heating device 11 to improve the furnace temperature in boiler 1, solve when the degree of depth peak shaving steadily fire difficult, economic nature poor and SNCR inefficiency arouse the NOx index can't reach the environmental protection requirement scheduling problem, improve the comprehensive properties of the degree of depth peak shaving of boiler 1.
One end of the pipeline II is connected with a steam inlet header 10, the steam inlet header 10 is connected with a valve group, the valve group is independently connected to a reheat steam main pipe through a steam guide tee joint 4, a heat source extracts steam from the reheat steam main pipe, the thermoelectric decoupling of a unit is facilitated, and the method has important significance for more deep peak regulation subsidies of power generation enterprises; and the other end of the pipeline II is connected with a drainage component. In practical application, the drain assembly comprises a drain header 12 and a drain flash tank 13, one end of the drain header 12 is connected to the pipeline II, steam after heat release is changed into a saturated steam-water mixture and is connected to the drain header 12 for collection, the other end of the steam is connected to the drain flash tank 13, and the drain flash tank 13 is connected to a condenser of a power plant after being processed by the drain flash tank 13.
The air heating device 11 functions as: the high-temperature steam from the steam inlet header 10 and the hot primary air from the air preheater outlet are subjected to heat transfer and exchange in the air heating device 11, and the heated hot primary air is fed to the primary air box of the boiler 1.
② valve set
Because the degree of improving circulating fluidized bed boiler 1 degree of depth peak regulation comprehensive properties is relevant with the hot primary air temperature improvement level of sending into boiler 1, concrete appearance is: the flow of the high-temperature steam and the air heating device 11 is adjusted through the valve group, and the temperature of the hot primary air sent into the hearth of the boiler 1 is further controlled. In practical application, the valve group comprises a check valve 5, a gate valve 6, an electric gate valve 7, an electric regulating valve 8 and a pressure reducing valve 9 which are sequentially connected through pipelines, the check valve 5 is connected with the steam leading tee joint 4 through a pipeline, and the pressure reducing valve 9 is connected with the steam inlet header 10 through a pipeline. And a steam guide tee joint 4 is arranged on the reheating steam main pipe, and steam passes through a check valve 5, a gate valve 6, an electric gate valve 7 and an electric regulating valve 8 in sequence, is subjected to pressure regulation through a pressure reducing valve 9 and then is sent to a steam inlet header 10. The check valve 5 can prevent pumped steam from flowing back, and the gate valve 6 and the electric gate valve 7 are in a normally open state under a normal operation condition; the electric control valve 8 can adjust the flow of the steam to control the heat exchange amount in the air heating device 11 so as to adjust the temperature of the heated hot primary air. When the circulating fluidized bed boiler operates, the flow of high-temperature steam entering the air heating device 11 is adjusted through the electric adjusting valve 8, so that the temperature of hot primary air sent into a hearth of the boiler 1 is controlled, and the degree of improving the deep peak shaving comprehensive performance of the circulating fluidized bed boiler 1 is determined by improving the level of the temperature of the hot primary air sent into the boiler 1.
The following examples of practical applications of the solution of the present embodiment are adopted:
a certain 330MW subcritical circulating fluidized bed unit responds to the national deep peak regulation policy, consumes new energy in the region where the unit is located for power generation, and normally regulates the peak to 30% BMCR load operation. In order to further improve the economic benefit of participating in deep peak regulation, the power plant is required to be operated under the working condition of 20 percent BMCR. The method is combined with the actual operation data of 30% BMCR load of the power plant, and the bed temperature of the boiler 1 and the smoke temperature at the inlet of the separator are low when the 20% BMCR load working condition is predicted, so that the combustion stability in the boiler, the combustion efficiency of the boiler 1, the desulfurization efficiency in the boiler and the SNCR denitration efficiency can be directly influenced, and the unit is limited to further reduce the load operation on the basis of the current peak load regulation.
When the unit is subjected to deep peak shaving to 20% BMCR load working condition, high-temperature steam of 30T/h (steam pressure P is 1.2MPa, steam temperature T is 500 ℃) is extracted from a reheating steam pipeline through an extraction tee joint, the steam flow is controlled through an electric adjusting valve 8, the steam pressure is adjusted through a reducing valve 9, and after passing through a steam inlet header 10, hot primary air with the outlet temperature of 153 ℃ of an air preheater is further heated to 303 ℃ in an air heating device 11. The hot primary air with the temperature of 303 ℃ is sent to a primary air box to enter a hearth of the boiler 1 to participate in combustion. The high-temperature steam is changed into a steam-water mixture with the temperature of 188 ℃ after releasing heat, passes through a drainage header 12, is sent to a drainage flash tank 13 of the boiler 1, and then is sent to a condenser of a power plant. After the temperature of the hot primary air is increased from 153 ℃ to 303 ℃, the bed temperature of the boiler 1 is increased from 810 ℃ to 880 ℃, and the temperature of the smoke at the inlet of the separator is increased from 670 ℃ to 708 ℃.
The following table compares the parameters of the boiler 1 designed and operated by adopting the traditional thermodynamic system with those of the boiler operated after the embodiment is adopted:
| item | Unit of | Conventional design | After adopting the embodiment |
| Primary air temperature | ℃ | 153 | 303 |
| Bed temperature of boiler | ℃ | 810 | 880 |
| Separator inlet flue gas temperature | ℃ | 670 | 708 |
| Reheat steam flow to steam turbine | t/h | 196 | 166 |
After the technology of the embodiment is adopted for optimization, when the unit deep peak shaving reaches 20% BMCR load working condition, the primary air temperature is increased by 150 ℃, the bed temperature of the boiler 1 is increased by about 70 ℃, and the smoke temperature at the inlet of the separator is increased by about 38 ℃. The promotion of hot primary air temperature makes 1 bed temperature of boiler obtain the rising, and the improvement of 1 bed temperature of boiler will strengthen combustion stability when 1 low-load of boiler, promotes combustion efficiency and desulfurization efficiency in the stove, and the temperature rise of separator entry smoke temperature can improve SNCR denitration efficiency.
The overall improvement of the temperature in the boiler during deep peak regulation can enhance the comprehensive performance of the peak regulation of the boiler 1 from the aspects of safety, economy, environmental protection and the like, and meanwhile, because the heated primary air extracts 15 percent of reheated steam, the steam quantity going to the intermediate pressure cylinder of the steam turbine 2 is reduced from 196t/h to 166t/h, the generated energy under the same load can be reduced, and the peak regulation subsidy and the economic benefit of a power plant are increased.
Example 2
In the embodiment 1, the valve set is connected to the reheat steam main pipe through the steam guide tee joint 4, and the steam in the reheat steam main pipe is used as a high-temperature steam source for heating the primary air. In the embodiment, as shown in fig. 3, the valve set is separately connected to the main steam main pipe through the induced steam tee 4, steam in the main steam main pipe is used as a high-temperature steam source for heating the primary air, and the connection relationship and the working principle of other parts are unchanged.
Example 3
In the embodiment 1, the valve set is connected to the reheat steam main pipe through the steam guide tee joint 4, and the steam in the reheat steam main pipe is used as a high-temperature steam source for heating the primary air. In this embodiment, as shown in fig. 4, two valve sets are provided, and the two valve sets are connected to the main steam pipe and the reheat steam pipe through the steam guide tee 4, respectively, and the coupling mode of reheat steam and main steam is adopted as the high-temperature steam source of the primary air, so as to improve the selectivity of the system to the high-temperature steam source, and the composition of a single valve set is the same as that in embodiment 1, while the connection relationship and the working principle of other parts are unchanged.
In the embodiments 1 to 3, the three steam extraction methods provided can meet the heat source requirement of heating air, and can promote the power plant to realize thermoelectric decoupling, thereby obtaining more deep peak regulation subsidies and benefits.
The present invention is not limited to the above-mentioned optional embodiments, and any other products in various forms can be obtained by anyone under the teaching of the present invention, and any changes in the shape or structure thereof, all the technical solutions falling within the scope of the present invention, are within the protection scope of the present invention.
Claims (8)
1. The utility model provides a system for improve circulating fluidized bed boiler degree of depth peak shaver comprehensive properties, includes the boiler and connects in the female pipe of main steam and the female pipe of reheat steam of boiler, its characterized in that, this system includes:
the system comprises an air heating device, a heat exchanger and a heat exchanger, wherein the air heating device is provided with a pipeline I and a pipeline II for heat exchange, one end of the pipeline I is connected to a hot primary air outlet of an air preheater in the boiler, and the other end of the pipeline I is connected to a hot air pipeline of a primary air box in the boiler; one end of the pipeline II is connected with a steam inlet header, and the other end of the pipeline II is connected with a drainage component;
and the steam inlet header is connected to the main steam main pipe and/or the reheat steam main pipe through the valve group.
2. The system for improving the comprehensive performance of the deep peak shaving of the circulating fluidized bed boiler according to claim 1, wherein the valve set is separately connected to the main steam main pipe through a steam guide tee.
3. The system for improving the combined performance of the circulating fluidized bed boiler for deep peak shaving according to claim 1, wherein the valve set is separately connected to the reheat steam header by a steam introduction tee.
4. The system for improving the comprehensive performance of the deep peak shaving of the circulating fluidized bed boiler according to claim 1, wherein the valve sets are provided with two and two valve sets which are respectively connected to a main steam main pipe and a reheat steam main pipe through a steam guide tee joint.
5. The system for improving the comprehensive performance of the depth peak shaving of the circulating fluidized bed boiler according to any one of claims 2 to 4, wherein the valve set comprises a check valve, a gate valve, an electric regulating valve and a pressure reducing valve which are connected in sequence, the check valve is connected with the steam leading tee, and the pressure reducing valve is connected with the steam inlet header.
6. The system of claim 1, wherein the drain assembly comprises a drain header and a drain flash tank, one end of the drain header is connected to the pipeline II, and the other end of the drain header is connected to the drain flash tank.
7. The system for improving the comprehensive performance of the deep peak shaving of the circulating fluidized bed boiler according to claim 6, wherein the drainage flash tank is connected to a condenser.
8. The system for improving the comprehensive performance of the deep peak shaving of the circulating fluidized bed boiler according to claim 1, wherein the air heating device is arranged on a hot primary air pipeline of the boiler and adopts a surface heater.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114909647A (en) * | 2022-05-07 | 2022-08-16 | 西安交通大学 | Cogeneration unit and method for low-load stable combustion and thermoelectric deep decoupling |
| CN117053185A (en) * | 2023-06-21 | 2023-11-14 | 西安交通大学 | Transformation system for fire-pressing peak-shaving of circulating fluidized bed boiler |
-
2020
- 2020-12-25 CN CN202023195718.0U patent/CN214501207U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114909647A (en) * | 2022-05-07 | 2022-08-16 | 西安交通大学 | Cogeneration unit and method for low-load stable combustion and thermoelectric deep decoupling |
| CN117053185A (en) * | 2023-06-21 | 2023-11-14 | 西安交通大学 | Transformation system for fire-pressing peak-shaving of circulating fluidized bed boiler |
| CN117053185B (en) * | 2023-06-21 | 2024-04-09 | 西安交通大学 | Transformation system for fire-pressing peak-shaving of circulating fluidized bed boiler |
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