CN113757713A - Powder making system of coal mill with staged combustion furnace smoke mixing and drying fan for power - Google Patents
Powder making system of coal mill with staged combustion furnace smoke mixing and drying fan for power Download PDFInfo
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- CN113757713A CN113757713A CN202111024655.9A CN202111024655A CN113757713A CN 113757713 A CN113757713 A CN 113757713A CN 202111024655 A CN202111024655 A CN 202111024655A CN 113757713 A CN113757713 A CN 113757713A
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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 powder-making system of a coal mill with a staged combustion furnace smoke mixing and drying fan 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 mouth and a main pulverized coal burner of the boiler, and also comprises: the boiler exhaust gas combustor is arranged at the upper part of the main pulverized coal combustor of the boiler; the high-temperature furnace smoke pipeline is connected to a smoke port of the high-temperature furnace and 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 flue pipe; the fan coal mill is communicated with the high-temperature furnace smoke pipeline, an outlet of the fan coal mill is sequentially connected with a coal mill separator and a pulverized coal concentration cyclone separation device, an outlet of the pulverized coal concentration cyclone separation device is communicated to a main pulverized coal burner and a boiler exhaust gas burner of a boiler respectively, so that the pulverized coal is heated by adopting a furnace smoke mixing and drying technology, pulverized coal is fed to realize the graded combustion of a lignite boiler, and the comprehensive performance and efficiency of pulverized coal drying and pulverizing and lignite combustion are improved.
Description
Technical Field
The invention belongs to the technical field of power coal boiler pulverized coal combustion power generation, and particularly relates to a pulverized coal pulverizing system of a power coal pulverizer with a staged combustion smoke mixing and drying fan.
Background
The lignite is one of main power coal sources in China, accounts for about 16.5% of the reserve of the power coal, is mainly characterized by high total moisture and low heat value, and is a key core factor of a powder preparation system of a large-scale lignite boiler and a lignite combustion technology.
At present, a medium-speed coal mill and a fan coal mill arranged in a traditional lignite boiler in China have wide application performance, but the technology has no clear conclusion, the design details of the coal pulverizing system directly influence the service efficiency of the boiler, the ultrahigh-moisture lignite boiler is not designed and manufactured in China, and the ultrahigh-moisture lignite boiler needs to be optimally designed to be better suitable for the ultrahigh-moisture low-calorific-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 provides a coal pulverizing system of a coal mill with a staged combustion flue gas mixing and drying fan for power use, so as to heat lignite with ultra-high moisture by using a flue gas mixing and drying technology, and further provide a pulverized coal concentration cyclone separation device, so as to increase auxiliary air to enhance the powder selection and feeding capabilities, and to use a ventilation air feeding technology to realize staged combustion of a lignite boiler, so as to improve the comprehensive performance and efficiency of drying and pulverizing lignite and combusting lignite.
The technical scheme adopted by the invention is as follows: the utility model provides a power is with hierarchical burning smoke mixing drying fan coal pulverizer powder process system, includes high temperature furnace smoke mouth and the main pulverized coal burner of boiler on locating boiler furnace, still includes:
the boiler exhaust gas combustor is arranged at the upper part of the main pulverized coal combustor of the boiler; the boiler is characterized in that the staged combustion of lignite of the boiler is realized, and the boiler exhaust gas combustor is arranged at the upper part of the main pulverized coal combustor of the boiler, so that the combustion efficiency is improved, the generation and the emission of NOx are reduced, and the efficient and clean power generation of lignite is promoted;
the high-temperature furnace smoke pipeline is connected to a smoke port of the high-temperature furnace, 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 used for supplying hot air and low-temperature furnace smoke;
a high-moisture lignite supply device communicated with the high-temperature furnace flue pipe;
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 to a main pulverized coal burner of the boiler and an exhaust gas burner of the boiler;
so as to realize the drying and the coal powder preparation of the ultra-high moisture lignite (coal for power generation), and ensure that a boiler coal pulverizing system and a combustion system operate under the safest and economic conditions.
Furthermore, the high-moisture lignite supply device comprises a raw coal hopper and a coal feeder, wherein 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 flue pipe so as to supply high-moisture lignite into the high-temperature furnace flue pipe.
Furthermore, the hot air pipeline and the low temperature furnace flue 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 to the high temperature furnace flue so as to carry out various combinations according to different loads of the boiler, thereby realizing flexible and various combinations of powder making and drying modes.
Furthermore, the hot air pipeline and the low-temperature furnace smoke pipeline are respectively connected with second branch pipes, 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;
the problem that a pressure head of a fan coal mill is insufficient in a high-altitude area is solved by introducing hot air or low-temperature furnace smoke as auxiliary cyclone air to enter a pulverized coal concentration cyclone separation device, separation efficiency and powder feeding capacity are improved, the key technical application of high-moisture lignite power generation in a lignite pithead power station in an area with a higher altitude (such as Yunnan and inner Mongolia of main lignite production areas) can be well solved, and the device has practical significance and social value.
Furthermore, 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 thick pulverized coal and 38% of waste gas are contained in the first pulverized coal feeding pipeline, and 20% of light pulverized coal and 62% of waste gas are contained in the second pulverized coal feeding pipeline;
80% of the separated concentrated coal powder and 38% of the separated exhaust gas enter a main coal powder burner of the boiler through a first powder feeding pipeline; the rest 20% of the light coal powder and 62% of the exhaust gas are used as tertiary air to enter the boiler exhaust gas combustor through the second powder feeding pipeline, so that the generation of NOx can be effectively reduced, and the efficient clean power generation of the lignite is realized.
Furthermore, 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 to 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, still include two storehouse air preheater, two storehouse air preheater's high temperature export with hot-blast pipeline connects and two low temperature access connection of storehouse air preheater have the forced draught blower, and two storehouse air preheater's low temperature exit linkage have an electrostatic precipitator, realize the supply to hot-blast through two storehouse air preheater's heat exchange.
Further, the exit linkage of electrostatic precipitator has cold-furnace smoke fan and draught fan, and the export and the low temperature stove tobacco pipe way intercommunication of cold-furnace smoke fan send into the low temperature stove tobacco pipe way with low temperature stove cigarette through cold-furnace smoke fan.
Furthermore, the hot air pipeline is communicated to the fan coal mill through a sealing air pipeline, and a fourth adjusting valve is arranged on the sealing air pipeline to enable hot air to flow back to the fan coal mill, so that further drying in the process of crushing raw coal in the fan coal mill is achieved.
The invention has the beneficial effects that:
1. the coal pulverizing system with the graded combustion furnace smoke mixing and drying fan coal pulverizer for power is applied to a lignite boiler with ultrahigh moisture, has strong furnace smoke mixing and drying capacity, assists coal powder concentration, separation and powder feeding through cyclone air, and realizes simple, efficient and energy-saving coal pulverizing system by adopting main burners and exhaust gas burners for coal powder concentration and dilution graded combustion; 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 entering a mill, the moisture of 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 capacity of powder produced by a fan mill is fully exerted.
Drawings
FIG. 1 is a schematic diagram of the overall configuration of a staged combustion flue gas mixing drying fan coal pulverizer pulverizing system for power provided by the present invention;
the drawings are labeled as follows:
the method comprises the following steps of 1-raw coal hopper, 2-coal feeder, 3-fan coal mill, 4-boiler main coal powder burner, 5-hot air pipeline, 6-low temperature furnace smoke pipeline, 7-high temperature furnace smoke pipeline, 8-boiler exhaust gas burner, 9-sealing air pipeline, 10-coal mill separator, 11-coal powder concentration cyclone separation device, 12-two-bin air preheater, 13-air feeder, 14-electric dust remover, 15-cold furnace smoke fan and 16-induced draft fan.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the 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 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 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 derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that 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 orientation or the positional relationship is based on the orientation or the positional relationship shown in the drawings, or the orientation or the positional relationship which is usually placed when the product of the present invention is used, or the orientation or the positional relationship which is usually understood by those skilled in the art, or the orientation or the positional relationship which is usually placed when the product of the present invention is used, and is only for the convenience of describing the present invention and simplifying the description, but does not indicate or imply that the indicated device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, 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 the terms "disposed" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected, unless explicitly stated or limited otherwise; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases by those skilled in the art; the drawings in the embodiments are used for clearly and completely describing the technical scheme in the embodiments of the invention, and obviously, the described embodiments are a part of the embodiments of the invention, but not all of the embodiments. The components of 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 power coal pulverizing system with a staged combustion furnace smoke mixing and drying fan coal mill, which is mainly applied to a super-high moisture lignite boiler, wherein the super-high moisture lignite boiler comprises a high-temperature furnace smoke hole, a main boiler coal burner and a boiler exhaust gas burner which are arranged on a hearth of the boiler, and the high-temperature furnace smoke hole is used for supplying high-temperature smoke.
When this fan coal pulverizer powder process system is in practical application, it still includes: a high-temperature furnace smoke pipeline, a high-moisture lignite supply device and a fan coal mill are specifically designed as follows as shown in figure 1:
smoke pipeline of high temperature furnace
The high-temperature furnace smoke pipeline is connected to the smoke port of the high-temperature furnace, 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 respectively supply hot air and low-temperature furnace smoke and mix the hot air and the low-temperature furnace smoke into the high-temperature furnace smoke in the high-temperature furnace smoke pipeline. In practical application, the hot air pipeline and the low-temperature furnace smoke pipeline are respectively connected with first branch pipes, each first branch pipe is provided with a first regulating valve, the first branch pipes are connected in parallel and then communicated to the high-temperature furnace smoke pipeline, and the flow of hot air and low-temperature furnace smoke entering the high-temperature furnace smoke pipeline are respectively regulated and controlled through the first regulating valves. When the system works, hot air at about 340 ℃ and low-temperature furnace smoke at about 140 ℃ are mixed and then enter a high-temperature furnace smoke pipeline at a smoke exhaust port to be fully mixed with high-temperature furnace smoke at about 1000 ℃, and the temperature of a furnace smoke mixed drying medium reaches about 820 ℃, so that the lignite with ultrahigh moisture of more than 45 percent is fully dried.
For realizing the supply of hot-blast and low temperature flue gas, this system still includes two storehouse air preheater, the high temperature export of two storehouse air preheater with hot-blast main connection (in order to provide high temperature hot-blast) and the low temperature access connection of two storehouse air preheater have the forced draught blower, and the low temperature exit linkage of two storehouse air preheater has cold furnace smoke fan and draught fan of the exit linkage of electrostatic precipitator and electrostatic precipitator, and the export of cold furnace smoke fan and low temperature furnace tobacco pipe way intercommunication (in order to provide the low temperature flue gas that forms after the heat exchange), and the high temperature import of two storehouse air preheater lets in there is the high temperature flue gas, and the high temperature flue gas comes from in the furnace of super high moisture lignite boiler. When the air preheater with two bins works, the high-temperature furnace smoke introduced into the air preheater with two bins exchanges heat with the rotational flow air introduced into the low-temperature inlet, so that hot air is obtained and supplied to the high-temperature furnace smoke pipeline through the hot air pipeline; on the other hand, low-temperature flue gas is obtained and supplied to the high-temperature flue gas pipeline through the low-temperature flue gas pipeline.
The hot air pipeline is communicated to the fan coal mill through the sealing air pipeline, the fourth adjusting valve is arranged on the sealing air pipeline, the hot air quantity entering the fan coal mill is controlled through the fourth adjusting valve, under the action of hot air, further drying during grinding and crushing in the fan coal mill can be further accelerated, meanwhile, hot air sent by the sealing air pipeline plays a role in sealing equipment of the fan coal mill, and powder leakage is prevented. Meanwhile, hot air sent by the sealed air pipeline plays a role in sealing equipment of 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 enters a high-temperature furnace smoke pipeline from a raw coal hopper through a coal feeder for feeding coal, is pre-dried with a mixed medium, the temperature of the mixed drying medium reaches about 820 ℃, the mixed hot smoke is used for pre-drying the high-moisture lignite and then rapidly drops to about 600 ℃, the temperature is reduced to within 500 ℃ again before the mixed hot smoke reaches an inlet of a coal mill, and at the moment, the surface moisture of the raw coal is effectively evaporated.
Fan coal mill
The high-moisture lignite is dried and crushed in a drying section of a smoke pipeline of a high-temperature furnace, most of surface moisture is evaporated, namely the initial stage of powder making, then the high-moisture lignite enters a fan coal mill, is milled and crushed in the fan coal mill and is further dried, the temperature of the outlet of a separator of the coal mill can reach about 160 ℃, the moisture of the pulverized coal can reach about 10%, and a qualified air-powder mixture is conveyed to a pulverized coal concentration cyclone separation device by a pressure head of the fan coal mill.
The fan coal mill is communicated with a high-temperature furnace smoke pipeline, a coal mill separator and a pulverized coal concentration cyclone separation device are sequentially connected to the outlet of the fan coal mill, and the outlet of the pulverized coal concentration cyclone separation device is respectively communicated to a main pulverized coal 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 a main pulverized coal burner of a 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 thick pulverized coal and 38% of waste gas are contained in the first pulverized coal feeding pipeline, and 20% of light pulverized coal and 62% of waste gas are contained in the second pulverized coal feeding pipeline.
In order to supplement the problem of insufficient pressure head of a fan coal mill in a high-altitude area, hot air or low-temperature furnace smoke can be introduced to be used as auxiliary cyclone air to enter a pulverized coal concentration cyclone separation device so as to increase the separation efficiency and the powder feeding capacity. In practical application, the hot air pipeline and the low-temperature furnace smoke pipeline are respectively connected with second branch pipes, each second branch pipe is provided with a second regulating valve, and the second branch pipes are connected in parallel and then communicated to the pulverized coal concentration cyclone separation device, 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 air is an auxiliary design for a pulverized coal concentration cyclone separation device aiming at a boiler installed in a high-altitude area, and is used for making up the defect that a pressure head of a fan coal mill is not improved due to the high altitude. The first regulating valve for controlling cyclone wind (hot wind or low temperature smoke) is fully opened during the operation of the boiler, the opening degree of the second regulating valve is controlled to ensure that the wind quantity sent into the pulverized coal concentration cyclone separation device is about 5% -7.5% of the total primary wind, and the wind door of the second regulating valve is still opened by 50% within a period of time after the fan coal mill is stopped, so that the pulverized coal discharged when the fan coal mill is idle is prevented from being deposited at the elbow of the cyclone wind pipe of the pulverized coal concentration cyclone separation device to cause ignition. Meanwhile, the medium components, volume capacity and pressure of the auxiliary cyclone air are adjusted to realize that the primary air speed and the tertiary air speed meet the combustion requirement of the boiler.
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 power that provides above-mentioned with hierarchical burning furnace cigarette mixed drying fan coal pulverizer powder process system, its theory of operation is as follows:
mixing hot air at about 340 ℃ with low-temperature furnace smoke at about 140 ℃, then entering a high-temperature furnace smoke pipeline at a smoke exhaust port to be fully mixed with the high-temperature furnace smoke at about 1000 ℃, feeding high-moisture lignite from a raw coal hopper through a coal feeder to enter the high-temperature furnace smoke pipeline, pre-drying the high-moisture lignite with a mixed medium, and mixing the dried medium to reach about 820 ℃;
the mixed hot flue gas pre-dries the high-moisture lignite and then quickly reduces the temperature to about 600 ℃, the temperature is reduced to be 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 furnace smoke pipeline, most of surface moisture is evaporated, namely the initial stage of powder making, then the high-moisture lignite enters a fan coal mill, is ground and crushed in the fan coal mill and is further dried until the temperature of the high-moisture lignite reaches about 160 ℃ at an outlet of a coal mill separator, the moisture of the pulverized coal can reach about 10%, and a qualified air-powder mixture is conveyed to a pulverized coal concentration cyclone separation device by a pressure head of the fan coal mill;
the coal powder concentration cyclone separation device separates out 80% of concentrated coal powder and 38% of exhaust gas, and the concentrated coal powder and the 38% of exhaust gas enter a main coal powder burner of the boiler through a first powder feeding pipeline, and the rest 20% of light coal powder and 62% of exhaust gas enter a waste gas burner of the boiler through a second powder feeding pipeline. 80% of the concentrated coal powder and 38% of the exhaust gas enter the main coal powder burner of the boiler, the rest 20% of the light coal powder and 62% of the exhaust gas enter the exhaust gas burner of the boiler, and the main coal powder burner of the boiler and the exhaust gas burner of the boiler are designed at a reasonable distance in height, so that the main coal powder burner of the boiler is very favorable for ignition, the generation of NOx can be reduced, and efficient clean combustion is realized.
When practical application, the powder process drying mode combination form is nimble various, can carry out multiple combination according to the boiler load difference, as follows:
combination 1: when the load of the boiler is 68-100%, drying by two media of high-temperature furnace smoke and hot air (which can be realized by regulating and controlling each first regulating valve);
and (3) 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, or by two media of high-temperature furnace smoke and hot air (the drying can be realized by regulating and controlling each first regulating valve);
therefore, the combined mode of the mixed flue gas can be flexibly adjusted when the unit operates, the temperature of the air flow behind the coal mill separator is controlled within a reasonable range of 150-180 ℃ by adjusting the composition of the drying medium, the flow velocity of the powder pipe can be ensured by adjusting the number of the fan coal mills no matter how the load changes, and meanwhile, the oxygen content is ensured to meet the explosion-proof requirement.
The invention is not limited to the above alternative embodiments, and any other various forms of products can be obtained by anyone in the light of the present invention, but any changes in shape or structure thereof, which fall within the scope of the present invention as defined in the claims, fall within the scope of the present invention.
Claims (9)
1. The utility model provides a power is with hierarchical burning smoke mixing drying fan coal pulverizer powder process system, is including locating high temperature furnace smoke mouth and the main pulverized coal burner of boiler on the boiler furnace, its characterized in that still includes:
the boiler exhaust gas combustor is arranged at the upper part of the main pulverized coal combustor of the boiler;
the high-temperature furnace smoke pipeline is connected to a smoke port of the high-temperature furnace, 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 used for supplying hot air and low-temperature furnace smoke;
a high-moisture lignite supply device communicated with the high-temperature furnace flue pipe;
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 to a main pulverized coal burner of the boiler and an exhaust gas burner of the boiler.
2. The pulverized coal making system with a staged combustion furnace smoke mixing and drying fan coal mill as claimed in claim 1, wherein said high moisture lignite supply device comprises a raw coal hopper and a coal feeder, one end of said coal feeder is connected to the raw coal hopper, and the other end is connected to the high temperature furnace smoke pipeline.
3. The coal pulverizing system of claim 1, wherein the hot air duct and the low temperature furnace flue duct are connected to first branch pipes, respectively, each first branch pipe is provided with a first regulating valve, and each first branch pipe is connected in parallel and then communicated to the high temperature furnace flue duct.
4. The power pulverized coal processing system with the staged combustion furnace smoke mixing and drying fan coal mill as claimed in claim 1, wherein 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 to the pulverized coal concentration cyclone separation device.
5. The coal pulverizing system of claim 1, wherein the pulverized coal concentrating cyclone separator is connected to the main pulverized coal burner of the boiler through a first pulverized coal feeding pipe, the pulverized coal concentrating cyclone separator is connected to the exhaust gas burner of the boiler through a second pulverized coal feeding pipe, and the first pulverized coal feeding pipe contains 80% of concentrated pulverized coal and 38% of exhaust gas, and the second pulverized coal feeding pipe contains 20% of light pulverized coal and 62% of exhaust gas.
6. The power pulverized coal system with the staged combustion furnace smoke mixing and drying fan coal mill as claimed in claim 5, wherein the second powder feeding pipeline is connected to the high temperature furnace smoke pipeline through a third branch pipe, and a third regulating valve is arranged on the third branch pipe.
7. The pulverized coal making system of the power-used staged combustion furnace smoke hybrid drying fan coal mill according to claim 1, further comprising a two-bin air preheater, wherein the high-temperature outlet of the two-bin air preheater is connected with the hot air pipeline, the low-temperature inlet of the two-bin air preheater is connected with a blower, and the low-temperature outlet of the two-bin air preheater is connected with an electric dust remover.
8. The power coal pulverizing system with the staged combustion furnace smoke mixing and drying fan coal mill as claimed in claim 7, wherein the outlet of the electric dust remover is connected with a cold furnace smoke blower and an induced draft fan, and the outlet of the cold furnace smoke blower is communicated with the low temperature furnace smoke pipeline.
9. The power pulverized coal system with the staged combustion furnace smoke mixing and drying fan coal mill as claimed in claim 1, wherein the hot air duct is connected to the fan coal mill through a sealing air duct, and a fourth regulating valve is disposed on the sealing air duct.
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