CN113757713B - Powder making system of graded combustion furnace smoke mixing drying fan coal mill for power - Google Patents
Powder making system of graded combustion furnace smoke mixing drying fan coal mill for power Download PDFInfo
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- CN113757713B CN113757713B CN202111024655.9A CN202111024655A CN113757713B CN 113757713 B CN113757713 B CN 113757713B CN 202111024655 A CN202111024655 A CN 202111024655A CN 113757713 B CN113757713 B CN 113757713B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K1/00—Preparation of lump or pulverulent fuel in readiness for delivery to combustion apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K3/00—Feeding or distributing of lump or pulverulent fuel to combustion apparatus
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
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Abstract
The invention discloses a coal pulverizing system of a staged combustion furnace smoke mixing drying fan coal mill for power, which belongs to the technical field of pulverized coal combustion power generation of a coal boiler for power, and comprises a high-temperature furnace smoke port and a main boiler pulverized coal burner, and further comprises the following components: the boiler exhaust gas burner is arranged at the upper part of the main pulverized coal burner of the boiler; the high-temperature furnace smoke pipeline is connected to the high-temperature furnace smoke port and is communicated with a hot air pipeline and a low-temperature furnace smoke pipeline; a high-moisture lignite supply device communicated with the high-temperature furnace smoke pipeline; the outlet of the fan coal mill is sequentially connected with a coal mill separator and a pulverized coal concentration cyclone separation device, and the outlet of the pulverized coal concentration cyclone separation device is respectively communicated with a main pulverized coal burner of a boiler and a waste gas burner of the boiler so as to heat ultra-high-moisture lignite by adopting a flue gas mixing and drying technology and send powder to realize the classified combustion of the lignite boiler, thereby improving the comprehensive performance and efficiency of lignite drying and pulverizing and lignite combustion.
Description
Technical Field
The invention belongs to the technical field of pulverized coal combustion power generation of a coal boiler for power, and particularly relates to a coal pulverizing system of a coal mill with a staged combustion furnace smoke mixing drying fan for power.
Background
Lignite is one of main power coal sources in China, accounts for 16.5% of the power coal reserves, is mainly characterized by higher total moisture and lower heat value, and is a key core factor of a large-scale lignite boiler pulverizing system selection and lignite combustion technology.
At present, the conventional lignite boiler in China is provided with a medium-speed coal mill and a fan coal mill direct blowing powder system, but the technical advantages and disadvantages have no clear conclusion, the detailed difference of the design of the powder making system directly influences the service efficiency of the boiler, the ultrahigh-moisture lignite boiler is not a precedent for design and manufacture in China, and the ultrahigh-moisture lignite boiler needs to be optimally designed to be better suitable for the ultrahigh-moisture low-heat-value lignite boiler.
Disclosure of Invention
In view of the above, in order to solve the above problems in the prior art, the present invention is to provide a pulverizing system of a staged combustion furnace-smoke mixing drying fan coal pulverizer for power, so as to heat ultra-high moisture lignite by adopting a furnace-smoke mixing drying technology, and to provide a pulverized coal concentration cyclone separation device, increase auxiliary air to enhance the powder selecting and feeding capability, and to adopt the technology of achieving staged combustion of a lignite boiler by using exhaust gas powder feeding, so as to improve the comprehensive performance and efficiency of lignite drying pulverizing and lignite combustion.
The technical scheme adopted by the invention is as follows: the utility model provides a hierarchical combustion stove cigarette mixes dry fan coal pulverizer powder process system for power, includes high temperature stove mouth and the main pulverized coal burner of boiler of locating on the boiler furnace, still includes:
the boiler exhaust gas burner is arranged at the upper part of the main pulverized coal burner of the boiler; the pulverized coal staged combustion device has the advantages that the pulverized coal staged combustion of the boiler is realized, the boiler exhaust gas burner is arranged at the upper part of the main pulverized coal burner of the boiler, so that the combustion efficiency is improved, the generation and the emission of NOx are reduced, and the high-efficiency and clean power generation of the pulverized coal is promoted;
the high-temperature furnace smoke pipeline is connected to the high-temperature furnace smoke port and is communicated with a hot air pipeline and a low-temperature furnace smoke pipeline, and the hot air pipeline and the low-temperature furnace smoke pipeline are respectively used for supplying hot air and low-temperature furnace smoke;
a high-moisture lignite supply device communicated with the high-temperature furnace smoke pipeline;
the outlet of the fan coal mill is sequentially connected with a coal mill separator and a coal powder concentration cyclone separation device, and the outlet of the coal powder concentration cyclone separation device is respectively communicated with a main coal powder burner of the boiler and a waste gas burner of the boiler;
so as to realize the drying and the pulverized coal preparation of the ultra-high moisture lignite (coal for power generation), and ensure that a boiler pulverizing system and a combustion system operate under the safest and economical conditions.
Further, the high-moisture lignite supply device comprises a raw coal bucket and a coal feeder, wherein one end of the coal feeder is connected with the raw coal bucket, and the other end of the coal feeder is communicated with the high-temperature furnace smoke pipeline so as to supply high-moisture lignite into the high-temperature furnace smoke pipeline.
Further, the hot air pipeline and the low-temperature furnace smoke pipeline are respectively connected with a first branch pipe, each first branch pipe is provided with a first regulating valve, and each first branch pipe is connected in parallel and then communicated with the high-temperature furnace smoke pipeline, so that various combinations are carried out according to different loads of the boiler, and the combination modes of the powder preparation and the drying are flexible and various.
Further, the hot air pipeline and the low-temperature furnace smoke pipeline are respectively connected with a second branch pipe, each second branch pipe is provided with a second regulating valve, and each second branch pipe is connected in parallel and then is communicated with the pulverized coal concentration cyclone separation device;
the hot air or low-temperature furnace smoke is introduced as auxiliary cyclone air to enter the pulverized coal concentration cyclone separation device, so that the problem of insufficient pressure head of a fan coal mill in a high-altitude area is solved, the separation efficiency and the powder feeding capacity are increased, the key technical application of high-moisture lignite power generation in a lignite pithead power station in an area with higher altitude (such as Yunnan and inner Mongolia of a lignite main production area) can be well solved, and the method has practical significance and social value.
Further, the pulverized coal concentration cyclone separation device is communicated to a main pulverized coal burner of the boiler through a first pulverized coal feeding pipeline, the pulverized coal concentration cyclone separation device is communicated to a waste gas burner of the boiler through a second pulverized coal feeding pipeline, 80% of concentrated pulverized coal and 38% of waste gas are arranged in the first pulverized coal feeding pipeline, and 20% of lean pulverized coal and 62% of waste gas are arranged in the second pulverized coal feeding pipeline;
the separated 80% of concentrated coal powder and 38% of exhaust gas enter a main coal powder burner of a boiler through a first powder feeding pipeline; the rest 20% of the light coal dust and 62% of the exhaust gas enter the boiler exhaust gas burner as tertiary air through the second powder feeding pipeline, so that the generation of NOx can be effectively reduced, and the efficient clean power generation of lignite is realized.
Further, the second powder feeding pipeline is communicated to the high-temperature furnace smoke pipeline through a third branch pipe, a third regulating valve is arranged on the third branch pipe, and exhaust gas in the second powder feeding pipeline flows back into the high-temperature furnace smoke pipeline through the third branch pipe so as to effectively regulate the drying temperature in the high-temperature furnace smoke pipeline.
Further, the air conditioner also comprises a double-bin air preheater, a high-temperature outlet of the double-bin air preheater is connected with the hot air pipeline, a low-temperature inlet of the double-bin air preheater is connected with a blower, a low-temperature outlet of the double-bin air preheater is connected with an electric dust collector, and the supply of hot air is realized through heat exchange of the double-bin air preheater.
Further, the outlet of the electric dust remover is connected with a cold furnace smoke fan and a draught fan, and the outlet of the cold furnace smoke fan is communicated with the low-temperature furnace smoke pipeline, and the low-temperature furnace smoke is sent into the low-temperature furnace smoke pipeline through the cold furnace smoke fan.
Further, the hot air pipeline is communicated to the fan coal mill through the sealed air pipeline, and the sealed air pipeline is provided with a fourth regulating valve so as to flow hot air back to the fan coal mill, and further drying of raw coal in the crushing process of the fan coal mill is realized.
The beneficial effects of the invention are as follows:
1. the coal pulverizing system of the graded combustion furnace smoke mixing drying fan coal mill for power is applied to an ultra-high-moisture lignite boiler, has strong furnace smoke mixing drying capability, assists in concentrating, separating and feeding coal powder by cyclone wind, adopts the main burner and the exhaust burner to perform coal powder concentration graded combustion so as to realize the simplicity, high efficiency and energy saving of the coal pulverizing system; meanwhile, for the ultra-high moisture lignite with the mass content of more than 45%, high-temperature furnace smoke, low-temperature furnace smoke and hot air can be used for mixing and drying, the temperature of a drying agent can reach about 820 ℃, the raw coal is pre-dried in a drying section of a high-temperature furnace smoke pipeline before being ground, the moisture of the pulverized coal can be reduced to about 10% after leaving a coal mill, the combustion requirement of a lignite boiler is fully ensured, and the drying capability of the fan grinding powder is fully exerted.
Drawings
FIG. 1 is a schematic diagram of the overall structure of a coal pulverizing system of a staged combustion flue gas mixing drying fan coal pulverizer for power provided by the invention;
the figures are marked as follows:
1-raw coal hopper, 2-coal feeder, 3-fan coal mill, 4-boiler main pulverized coal burner, 5-hot air pipeline, 6-low temperature furnace smoke pipeline, 7-high temperature furnace smoke pipeline, 8-boiler exhaust gas burner, 9-seal air pipeline, 10-coal mill separator, 11-pulverized coal concentration cyclone separation device, 12-two-bin air preheater, 13-blower, 14-electric dust collector, 15-cold furnace smoke blower and 16-induced draft fan.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of 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 apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention 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 invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the embodiments of the present invention, it should be noted that, the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship conventionally put in use of the product of the present invention as understood by those skilled in the art, merely for convenience of describing the present invention and simplifying the description, and is not indicative or implying that the apparatus or element to be referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for understanding as indicating or implying a relative importance.
In the description of the embodiments of the present invention, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; may be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in the present invention will be understood in detail by those skilled in the art; the accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Example 1
The embodiment specifically discloses a hierarchical burning furnace cigarette mixes dry fan coal pulverizer powder process system for power, and this fan coal pulverizer powder process system is mainly used in super high moisture brown coal boiler, and this super high moisture brown coal boiler is including locating high temperature stove smoke mouth, boiler main coal burner and the boiler exhaust gas burner on this boiler furnace, and wherein, high temperature stove smoke mouth is used for supplying high temperature flue gas.
When the fan coal mill pulverizing system is practically applied, the fan coal mill pulverizing system further comprises: the high-temperature flue gas pipeline, the high-moisture lignite supply device and the fan coal mill are specifically designed as follows, as shown in fig. 1:
(1) high temperature furnace flue
The high-temperature furnace smoke pipeline is connected to the high-temperature furnace smoke port, the high-temperature furnace smoke pipeline is communicated with a hot air pipeline and a low-temperature furnace smoke pipeline, and the hot air pipeline and the low-temperature furnace smoke pipeline are respectively supplied with hot air and low-temperature furnace smoke and are mixed into the high-temperature furnace smoke in the high-temperature furnace smoke pipeline. When the device is in practical application, the hot air pipeline and the low-temperature furnace smoke pipeline are respectively connected with a first branch pipe, each first branch pipe is provided with a first regulating valve, and each first branch pipe is connected in parallel and then is communicated with the high-temperature furnace smoke pipeline, and the flow of hot air and low-temperature furnace smoke entering the high-temperature furnace smoke pipeline is respectively regulated and controlled through the first regulating valves. When the system works, hot air at about 340 ℃ and low-temperature smoke at about 140 ℃ are mixed and then enter a high-temperature smoke pipeline at a smoke suction port to be fully mixed with high-temperature smoke at about 1000 ℃, and the temperature of a smoke mixing and drying medium reaches about 820 ℃ to fully dry lignite with ultrahigh moisture content of more than 45%.
In order to realize the supply of hot air and low temperature stove cigarette, this system still includes two bin air pre-heaters, the high temperature export of two bin air pre-heaters with hot air piping connection (in order to provide high temperature hot air) and the low temperature access connection of two bin air pre-heaters have the forced draught blower, the low temperature export of two bin air pre-heaters has the electrostatic precipitator and the exit linkage of electrostatic precipitator has cold stove cigarette fan and draught fan, and the export and the low temperature stove cigarette piping intercommunication of cold stove cigarette fan (in order to provide the low temperature stove cigarette that forms after the heat exchange), the high temperature access of two bin air pre-heaters lets in has high temperature stove cigarette, high temperature stove cigarette comes from in the furnace of super high moisture brown coal boiler. When the two-bin air preheater works, the high-temperature furnace smoke introduced into the air preheater exchanges heat with the cyclone wind introduced into the low-temperature inlet, so that on one hand, hot air is obtained and is supplied to the high-temperature furnace smoke pipeline through the hot air pipeline; on the other hand, low-temperature furnace smoke is obtained and is supplied to the high-temperature furnace smoke pipeline through the low-temperature furnace smoke pipeline.
The hot air pipeline is communicated to the fan coal mill through the sealed air pipeline, the sealed air pipeline is provided with the fourth regulating valve, the hot air quantity entering the fan coal mill is controlled through the fourth regulating valve, the further drying during grinding and crushing in the fan coal mill can be further accelerated under the action of hot air, and meanwhile, the hot air sent by the sealed air pipeline plays a role in sealing equipment for the fan coal mill, so that powder leakage is prevented. Meanwhile, the hot air sent by the sealing air pipeline plays a role in sealing equipment for the fan coal mill, and powder leakage is prevented.
(2) High-moisture lignite supply device
The high-moisture lignite supply device is communicated with the high-temperature furnace smoke pipeline and comprises a raw coal hopper and a coal feeder, one end of the coal feeder is connected with the raw coal hopper, and the other end of the coal feeder is communicated with the high-temperature furnace smoke pipeline so as to supply high-moisture lignite into the high-temperature furnace smoke pipeline. The high-moisture lignite is fed by a coal feeder from a raw coal hopper, enters a high-temperature furnace smoke pipeline, is pre-dried with a mixed medium, the temperature of the mixed medium reaches about 820 ℃, the temperature of the mixed hot smoke is reduced to about 600 ℃ after the mixed hot smoke pre-dries the high-moisture lignite, the temperature of the mixed hot smoke is reduced to within 500 ℃ again before the mixed hot smoke reaches the inlet of a coal mill through a drying section, and at the moment, the moisture on the surface of the raw coal is effectively evaporated.
(3) Fan coal mill
The high-moisture lignite is dried and crushed in a high-temperature furnace smoke pipeline drying section, most of surface moisture is evaporated, namely, in an initial stage of powder making, then the lignite enters a fan coal mill, grinding and crushing are carried out in the fan coal mill, further drying is carried out, the outlet temperature of a separator of the coal mill can reach about 160 ℃, the moisture of coal powder can reach about 10%, and a qualified air-powder mixture is conveyed to a coal powder concentration cyclone separation device by virtue of a pressure head of the fan coal mill.
The fan coal mill is communicated with a high-temperature furnace smoke pipeline, the outlet of the fan coal mill is sequentially connected with a coal mill separator and a coal powder concentration cyclone separation device, and the outlet of the coal powder concentration cyclone separation device is respectively communicated with a main coal powder burner of a boiler and a waste gas burner of the boiler. In practical application, the pulverized coal concentration cyclone separation device is communicated to the main pulverized coal burner of the boiler through a first pulverized coal feeding pipeline, the pulverized coal concentration cyclone separation device is communicated to the exhaust gas burner of the boiler through a second pulverized coal feeding pipeline, the first pulverized coal feeding pipeline is provided with 80% of concentrated pulverized coal and 38% of exhaust gas, and the second pulverized coal feeding pipeline is provided with 20% of lean pulverized coal and 62% of exhaust gas.
In order to supplement the problem of insufficient pressure head of the fan coal mill in the high-altitude area, hot air or low-temperature furnace smoke can be introduced as auxiliary cyclone air to enter the pulverized coal concentration cyclone separation device, so that the separation efficiency and the powder feeding capacity are improved. In practical application, the hot air pipeline and the low-temperature flue gas pipeline are respectively connected with a second branch pipe, each second branch pipe is provided with a second regulating valve, and each second branch pipe is communicated with the pulverized coal concentration cyclone separation device after being connected in parallel, so that the separation efficiency and the powder feeding capacity of the pulverized coal concentration cyclone separation device during working are improved.
The auxiliary cyclone wind is an auxiliary design for the pulverized coal concentration cyclone separation device aiming at the boiler installed in the high-altitude area and is used for making up the defect of the lifting pressure head of the fan coal mill caused by high altitude. The first regulating valve for controlling the rotational flow air (hot air or low temperature furnace smoke) is fully opened in the operation of the boiler, the opening degree of the second regulating valve is controlled to ensure that the air quantity fed into the pulverized coal concentration rotational flow separation device is about 5% -7.5% of the total quantity of primary air, and the air door of the second regulating valve is still opened by 50% in a period of time after the fan coal mill stops running, so that the pulverized coal discharged during the idle running of the fan coal mill is prevented from being deposited at the rotational flow air pipe elbow of the pulverized coal concentration rotational flow separation device to cause ignition. Meanwhile, the primary air speed and the tertiary air speed meet the combustion requirements of the boiler by adjusting the medium components, volume capacity and pressure of the auxiliary cyclone air.
In order to regulate and control the temperature in the high-temperature furnace smoke pipeline, the second powder feeding pipeline is communicated to the high-temperature furnace smoke pipeline through a third branch pipe, and a third regulating valve is arranged on the third branch pipe.
Based on the above-mentioned hierarchical combustion stove cigarette hybrid drying fan coal pulverizer powder process system for power that provides, its theory of operation is as follows:
mixing hot air at about 340 ℃ and low-temperature furnace smoke at about 140 ℃ and then entering a high-temperature furnace smoke pipeline at a smoke suction port to be fully mixed with high-temperature furnace smoke at about 1000 ℃, feeding coal into the high-temperature furnace smoke pipeline from a raw coal hopper through a coal feeder, pre-drying the raw coal hopper and a mixing medium, and mixing the drying medium and then enabling the temperature to reach about 820 ℃;
the mixed hot flue gas pre-dries the high-moisture lignite and then quickly drops to about 600 ℃, the temperature is reduced to within 500 ℃ again before the mixed hot flue gas reaches the inlet of a coal mill through a drying section, and the moisture on the surface of the raw coal is effectively evaporated;
the high-moisture lignite is dried and crushed in a drying section of a high-temperature flue gas pipeline, most of surface moisture is evaporated, namely, in an initial stage of pulverizing, then the lignite enters a fan coal mill, grinding and crushing are carried out in the fan coal mill, further drying is carried out until the lignite reaches an outlet of a separator of the coal mill and the temperature reaches about 160 ℃, the moisture of coal dust can reach about 10%, and a qualified air-powder mixture is conveyed to a coal dust concentration cyclone separation device by virtue of a pressure head of the fan coal mill;
the pulverized coal concentration cyclone separation device separates 80% of concentrated pulverized coal and 38% of exhaust gas, the concentrated pulverized coal and the 38% of exhaust gas enter a main pulverized coal burner of a boiler through a first powder feeding pipeline, and the rest 20% of fresh pulverized coal and 62% of exhaust gas enter an exhaust gas burner of the boiler through a second powder feeding pipeline. Through entering 80% dense pulverized coal and 38% exhaust gas into the main pulverized coal burner of the boiler, the rest 20% thin pulverized coal and 62% exhaust gas enter the exhaust gas burner of the boiler, the main pulverized coal burner of the boiler and the exhaust gas burner of the boiler are designed at reasonable distances in height, which is very beneficial to ignition, meanwhile, the generation of NOx can be reduced, and the efficient clean combustion is realized.
In practical application, the combination modes of the pulverizing and drying are flexible and various, and various combinations can be carried out according to different boiler loads, as follows:
combination 1: when the boiler is at 68% -100% load, drying is carried out through a high-temperature flue gas and hot air two-medium (which can be realized by adjusting and controlling each first adjusting valve);
combination 2: when the load of the boiler is below 68%, the boiler can be dried by three media of high-temperature furnace smoke, low-temperature furnace smoke and hot air, and can also be dried by two media of high-temperature furnace smoke and hot air (which can be realized by adjusting and controlling each first regulating valve);
therefore, the combination mode of the mixed flue gas can be flexibly adjusted during the operation of the unit, so that the temperature of the air flow after the separator of the coal mill is controlled to be in a reasonable range of 150-180 ℃ by adjusting the composition components of the drying medium, the flow speed of the powder pipe can be ensured by adjusting the number of the fan coal mills no matter how the load is changed, and the oxygen quantity can be ensured to meet the explosion-proof requirement.
The invention is not limited to the above-described alternative embodiments, and any person who may derive other various forms of products in the light of the present invention, however, any changes in shape or structure thereof, all falling within the technical solutions defined in the scope of the claims of the present invention, fall within the scope of protection of the present invention.
Claims (8)
1. The utility model provides a hierarchical combustion stove cigarette mixes dry fan coal pulverizer powder process system for power, includes high temperature stove mouth and the main pulverized coal burner of boiler of locating on the boiler furnace, its characterized in that still includes:
the boiler exhaust gas burner is arranged at the upper part of the main pulverized coal burner of the boiler;
the high-temperature furnace smoke pipeline is connected to the high-temperature furnace smoke port and is communicated with a hot air pipeline and a low-temperature furnace smoke pipeline, and the hot air pipeline and the low-temperature furnace smoke pipeline are respectively used for supplying hot air and low-temperature furnace smoke;
a high-moisture lignite supply device communicated with the high-temperature furnace smoke pipeline;
the outlet of the fan coal mill is sequentially connected with a coal mill separator and a coal powder concentration cyclone separation device, and the outlet of the coal powder concentration cyclone separation device is respectively communicated with a main coal powder burner of the boiler and a waste gas burner of the boiler;
the hot air pipeline and the low-temperature furnace smoke pipeline are respectively connected with a second branch pipe, each second branch pipe is provided with a second regulating valve, and each second branch pipe is connected in parallel and then communicated with the pulverized coal concentration cyclone separation device.
2. The staged combustion flue gas mixing drying fan coal pulverizer milling system for power as defined in claim 1, wherein the high moisture lignite supply device comprises a raw coal hopper and a coal feeder, one end of the coal feeder is connected with the raw coal hopper, and the other end of the coal feeder is communicated with the high temperature flue gas pipeline.
3. The pulverizing system of the power staged combustion flue gas mixing drying fan coal mill according to claim 1, wherein the hot air pipeline and the low-temperature flue gas pipeline are respectively connected with first branch pipes, a first regulating valve is arranged on each first branch pipe, and each first branch pipe is communicated to the high-temperature flue gas pipeline after being connected in parallel.
4. The staged combustion flue gas mixing and drying fan coal mill pulverizing system for power as defined in claim 1, wherein the pulverized coal concentration and cyclone separation device is connected to the main pulverized coal burner of the boiler through a first powder feeding pipeline, the pulverized coal concentration and cyclone separation device is connected to the exhaust gas burner of the boiler through a second powder feeding pipeline, and the first powder feeding pipeline is 80% of concentrated pulverized coal and 38% of exhaust gas, and the second powder feeding pipeline is 20% of lean pulverized coal and 62% of exhaust gas.
5. The pulverizing system of the power staged combustion flue gas mixing drying fan coal pulverizer of claim 4, wherein the second powder feeding pipeline is communicated to the high temperature flue gas pipeline through a third branch pipe, and a third regulating valve is arranged on the third branch pipe.
6. The pulverizing system of the graded combustion furnace smoke mixing drying fan coal mill for the power of claim 1, further comprising a two-component air preheater, wherein a high-temperature outlet of the two-component air preheater is connected with the hot air pipeline, a low-temperature inlet of the two-component air preheater is connected with a blower, and a low-temperature outlet of the two-component air preheater is connected with an electric dust collector.
7. The staged combustion flue gas mixing and drying fan coal mill pulverizing system for power as defined in claim 6, wherein the outlet of the electric precipitator is connected with a cold flue gas fan and a draught fan, and the outlet of the cold flue gas fan is communicated with a low-temperature flue gas pipeline.
8. The staged combustion flue gas mixing and drying fan coal mill pulverizing system for power as defined in claim 1, wherein the hot air duct is connected to the fan coal mill by a sealed air duct, and a fourth regulating valve is provided on the sealed air duct.
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