CN111570022A - Hot air energy-saving environment-friendly pulverized coal processing technology - Google Patents
Hot air energy-saving environment-friendly pulverized coal processing technology Download PDFInfo
- Publication number
- CN111570022A CN111570022A CN202010453839.6A CN202010453839A CN111570022A CN 111570022 A CN111570022 A CN 111570022A CN 202010453839 A CN202010453839 A CN 202010453839A CN 111570022 A CN111570022 A CN 111570022A
- Authority
- CN
- China
- Prior art keywords
- coal
- hot air
- air
- vertical mill
- raw
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C15/00—Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs
- B02C15/007—Mills with rollers pressed against a rotary horizontal disc
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/02—Feeding devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/18—Adding fluid, other than for crushing or disintegrating by fluid energy
- B02C23/24—Passing gas through crushing or disintegrating zone
- B02C23/34—Passing gas through crushing or disintegrating zone gas being recirculated to crushing or disintegrating zone
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C1/00—Magnetic separation
- B03C1/02—Magnetic separation acting directly on the substance being separated
- B03C1/16—Magnetic separation acting directly on the substance being separated with material carriers in the form of belts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B7/00—Selective separation of solid materials carried by, or dispersed in, gas currents
- B07B7/08—Selective separation of solid materials carried by, or dispersed in, gas currents using centrifugal force
- B07B7/083—Selective separation of solid materials carried by, or dispersed in, gas currents using centrifugal force generated by rotating vanes, discs, drums, or brushes
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L9/00—Treating solid fuels to improve their combustion
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L9/00—Treating solid fuels to improve their combustion
- C10L9/02—Treating solid fuels to improve their combustion by chemical means
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L9/00—Treating solid fuels to improve their combustion
- C10L9/10—Treating solid fuels to improve their combustion by using additives
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/0052—Details for air heaters
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C15/00—Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs
- B02C2015/002—Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs combined with a classifier
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Organic Chemistry (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Food Science & Technology (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Disintegrating Or Milling (AREA)
Abstract
The invention relates to a hot air energy-saving environment-friendly pulverized coal processing technology, which comprises the following technological processes: raw coal is conveyed into a raw material bin for storage through a belt conveyor or a lifter after being deironized by a primary crushing electromagnetic iron remover, the raw coal is conveyed into a vertical mill directly or lifted by the raw material lifter, flue gas generated by burning the raw coal in a hot air furnace is supplied into the vertical mill, the raw coal is spread and ground by a grinding roller with rolling friction through a grinding disc rotating in the vertical mill, a suction fan draws air from the vertical mill through a pulse dust collector, the powder is selected by a powder selecting device of the vertical mill, an air cylinder of the suction fan returns hot air through a circulating pipeline, fine coal powder falling from the pulse dust collector falls into the conveyor, the fine coal powder is lifted and conveyed into a finished product bin for storage and transportation, the number and the production period of equipment are reduced, the process flow is simplified, the processing amount and the production efficiency are improved, dust is not raised, the moisture absorption and agglomeration of the coal powder during transportation are avoided, the phenomenon that, is suitable for the batch processing production of the environment-friendly pulverized coal.
Description
Technical Field
The invention relates to a hot air energy-saving environment-friendly pulverized coal processing technology, and belongs to the technical field of environment-friendly pulverized coal production.
Background
The environment-friendly pulverized coal has the advantages that the pulverized coal with fluidity has fine particles, the pulverized coal with unit mass has larger surface area, and a large amount of air can be adsorbed on the surface, so that the pulverized coal with fluidity is convenient for pneumatic transmission as fuel, heat energy is provided for a boiler, metallurgical coke is replaced, the iron-making coke ratio of a blast furnace is reduced, the pig iron cost is reduced, the heat absorption and the temperature rise of particle groups are faster when the pulverized coal is heated by radiation compared with the traditional pulverized coal, the ignition event is shorter, or the pulverized coal is used as a molding sand additive in the casting industry to.
In the prior art, the process for preparing the powder of the anthracite, the bituminous coal or the mixed coal adopts the steps that raw coal is primarily screened and then is sent into drying equipment through a conveying device, flue gas of a hot blast stove is dried, dust is collected by a bag-type dust collector, the dust is sent into a pulverizer through a hoister to be milled, then the milled powder is sent into a cyclone separator to be collected and screened, unqualified powder is returned to be ground, and the environment-friendly pulverized coal is obtained through collection. The drying collection and grinding screening processing technology which is carried out step by step has the advantages that the processing capacity of a dryer is limited, the hot drying air easily causes raised dust and sudden aggregation risks, the phenomena of wall sticking, blockage, discontinuous feeding, non-uniformity and excessive material return exist in dispersed materials, the overload load of a dust collection system is caused, the oxygen content in the grinding atmosphere is large, the oxygen content in the grinding atmosphere is easy to react with the basic sulfur-based nitrogen in the coal powder to produce pollution gas, the equipment line and the production period are long, the processing efficiency is low, the heat energy of the smoke of a hot air furnace is wasted, the temperature reduction and moisture absorption of the coal powder in the transfer process are easy to generate the aggregation phenomenon, the water content and the viscosity of the environment.
Disclosure of Invention
The invention aims to provide a hot air energy-saving environment-friendly pulverized coal processing technology aiming at the defects of the prior art, the quantity of equipment and the production period are reduced, the process flow is simplified, the processing treatment capacity and the production efficiency are improved, no raise dust exists, pulverized coal moisture absorption and agglomeration during transportation are avoided, the phenomena that the equipment is stained with walls and blocked are avoided, the energy consumption is obviously reduced, and the hot air energy-saving environment-friendly pulverized coal processing technology is suitable for the batch processing production of environment-friendly pulverized coal.
The invention is realized by the following technical scheme:
a hot air energy-saving environment-friendly pulverized coal processing technology comprises the following technological processes:
(1) the raw coal is primarily crushed, screened by a 25-55-mesh sieve, falls onto an inclined belt conveyor, is deironized by an electromagnetic deironing device and then is sent into a raw material bin for storage by the belt conveyor or a lifter, the raw coal in the raw material bin is directly sent into a feed pipe of a vertical mill by the belt conveyor or lifted by the raw material lifter, and continuously and uniformly enters a feed port of the vertical mill under the rotation action of an air locking feed valve of the feed pipe, the mass percentage content of water in the raw coal in the raw material bin is 6-18%, the middle diameter of a grinding disc of the vertical mill is 1550-;
(2) raw coal in a raw material bin is conveyed into a hot air furnace through a belt conveyor to be combusted to generate flue gas, and the flue gas is supplied into an air inlet of a vertical mill through air supply of an air blower, wherein the air inlet temperature is less than or equal to 450 ℃;
(3) after a vertical grinding machine is started and is spread and ground for 2-4 hours by a grinding roller which rotates in the vertical grinding machine and is in rolling friction, a suction fan draws air from an outlet at the top of the vertical grinding machine side through a pulse dust collector, powder is selected by an external stationary impeller and a movable impeller powder selecting device which rotates inside the stationary impeller in the vertical grinding machine, a hot air fine coal powder mixture is sent into the pulse dust collector through a finished product outlet, and a wind barrel of the suction fan returns hot air to a hot air furnace for cyclic utilization through a circulating pipeline;
the temperature of the grinding air is 80-95 ℃, the grinding air quantity is 65000-3The differential pressure of the vertical mill is 4-5kPa, and the coal at the slag discharge port of the vertical mill returns to the raw material bin through a material returning belt conveyer;
(4) the fine coal powder in the hot air fine coal powder mixture is blocked and falls down through a filter bag of a pulse dust collector, an electromagnetic pulse valve is opened at intervals to spray and expand to clean the filter bag, so that the falling fine coal powder falls into a conveyor, the conveyor at the bottom of the pulse dust collector is an auger or a pipe chain machine, a sampling device is arranged in a blanking pipeline of the pulse dust collector, the sampling detection coal powder is lifted by a finished product lifter and is conveyed into a finished product bin through the conveyor, and an environment-friendly coal powder finished product with the water content of more than or equal to 200 meshes and the water content of less than or equal to 6 percent is obtained and is used for storage.
The invention has the beneficial effects that:
(1) the raw coal is treated by an electromagnetic iron remover and screened to reduce the iron content and avoid the coking phenomenon of the furnace surface during combustion, is directly conveyed or lifted by a raw material lifting machine through a belt conveyor and is conveyed into a feed pipe of a vertical mill, so that different workshop settings are met, the raw coal is continuously and uniformly fed under the rotation action of an air-locking feed valve to avoid agglomeration, and the dispersion and grinding performance of the vertical mill is high;
(2) flue gas generated by combustion in the hot blast stove is dried in the grinding process, so that the oxygen content in the grinding atmosphere is reduced, pollutants generated in the grinding process are avoided, feeding, grinding, drying, grading and discharging are completed in a vertical grinding machine at one time, the moisture absorption and agglomeration of coal powder during transportation are avoided, and the suction fan exhausts air through the pulse dust collector to avoid induced air blockage;
(3) hot air returns hot-blast furnace cyclic utilization waste heat through circulation pipeline with hot-blast, has reduced equipment quantity and production cycle, has simplified process flow, has improved processing treatment capacity and production efficiency than traditional technology, does not have the raise dust and avoids buggy moisture absorption when transporting and reunites, avoids equipment to be stained with wall, blocking phenomenon, and the energy consumption reduces more than 30%, and area reduces 2/3, is applicable to environmental protection buggy batch processing production.
Drawings
FIG. 1 is a process flow diagram of the present invention.
FIG. 2 is a schematic view of the vertical mill of the present invention.
The labels in the figure are: the device comprises a raw material bin 1, a vertical mill 2, an air locking feeding valve 3, a raw material lifting machine 4, a feeding port 5, an air blower 6, a hot blast stove 7, an air inlet 8, a grinding disc 9, a grinding roller 10, an air ring 11, a stationary impeller 121, a movable impeller 122, a powder selecting device 12, a slag spitting port 13, a suction fan 14, a pulse dust collector 15, a circulating pipeline 16, a finished product lifting machine 17, a finished product bin 18 and a finished product outlet 19.
Detailed Description
The following description of the embodiments of the present invention will be made with reference to the accompanying drawings.
Example 1:
a hot air energy-saving environment-friendly pulverized coal processing technology comprises the following technological processes:
(1) the method comprises the following steps of (1) primarily crushing raw coal, screening by a 30-mesh sieve, falling onto an inclined belt conveyor, removing iron by an electromagnetic iron remover, and then conveying into a raw material bin 1 by the belt conveyor or a lifter for storage, wherein the raw coal is added with 11 parts of calcium absorbent, 5 parts of urea and 0.8 part of oxide additive according to the mass fraction of 95 parts;
the calcium absorbent is limestone, marble and calcite in a mass ratio of 1: 1: 1, wherein the oxide additive is manganese dioxide, lanthanum oxide and ytterbium oxide according to a mass ratio of 1:2:1, preparing a composition;
the raw coal in the raw material bin 1 is directly conveyed into a feeding pipe of a vertical mill 2 through a belt conveyor or is lifted by a raw material lifter 4 and continuously and uniformly enters a feeding port 5 of the vertical mill 2 under the rotation action of an air locking feeding valve 3 of the feeding pipe, the mass percentage content of the water in the raw coal in the raw material bin 1 is 15 percent, the middle diameter of a grinding disc 9 of the vertical mill 2 is 1550mm, and the feeding amount is 26 t/h;
(2) raw coal in the raw material bin 1 is sent into a hot blast stove 7 through a belt conveyor to be combusted to generate flue gas, and the flue gas is sent into an air inlet 8 of a vertical mill 2 through an air blower 6, wherein the air inlet temperature is 430 ℃;
(3) after a vertical grinding machine 2 is started and is spread and ground for 2 hours by a grinding disc 9 rotating in the vertical grinding machine 2 and a grinding roller 10 with rolling friction, a suction fan 14 draws air from an outlet at the top of the vertical grinding machine 2 side through a pulse dust collector 15, selects powder by a powder selecting device 12 of an external stationary impeller 121 and a movable impeller 122 rotating inside the stationary impeller 121 in the vertical grinding machine 2, sends a hot air fine coal powder mixture into the pulse dust collector 15 through a finished product outlet, and returns hot air to a hot air furnace 7 for cyclic utilization through a circulating pipeline 16 by an air cylinder of the suction fan 14;
the temperature of the mill air is 86 ℃, and the mill air quantity is 75000m3The differential pressure of the vertical mill 2 is 4.5kPa, and the coal material at the slag discharge port 13 of the vertical mill 2 returns to the raw material bin 1 through a material returning belt conveyer;
(4) the fine coal powder in the hot air fine coal powder mixture is blocked and falls down through a filter bag of a pulse dust collector 15, an electromagnetic pulse valve is opened at intervals to spray and expand to clean the filter bag, so that the falling fine coal powder falls into a conveyor, the conveyor at the bottom of the pulse dust collector 15 is a packing auger or a pipe chain machine, a sampling device is arranged in a blanking pipeline of the pulse dust collector 15, the sampling detection coal powder is lifted by a finished product lifter 17 and is conveyed into a finished product bin 18 through the conveyor, and an environment-friendly coal powder finished product with the water content of more than or equal to 200 meshes and less than or equal to 6% is obtained and is used for storage and transportation.
Example 2:
a hot air energy-saving environment-friendly pulverized coal processing technology comprises the following technological processes:
(1) the method comprises the following steps of (1) primarily crushing raw coal, screening by a 45-mesh sieve, falling onto an inclined belt conveyor, removing iron by an electromagnetic iron remover, and then conveying into a raw material bin 1 by the belt conveyor or a lifter for storage, wherein the raw coal is added with 7 parts of a calcium absorbent, 5 parts of an amino compound and 0.6 part of an oxide additive according to the mass fraction of 82 parts;
the calcium absorbent is dolomite, calcite or rhodochrosite according to the mass ratio of 1: 1:2, wherein the amino compound is cyclopropyl methyl amide and cyclopropyl carboxylic amide according to the mass ratio of 1: 1, wherein the oxide additive is boron trioxide, quartz sand and europium oxide according to a mass ratio of 1: 1:2, preparing a composition;
raw coal in a raw material bin 1 is directly conveyed into a feeding pipe of a vertical grinding machine 2 or is lifted by a raw material lifting machine 4 through a belt conveyor and continuously and uniformly enters a feeding port 5 of the vertical grinding machine 2 under the rotation action of an air locking feeding valve 3 of the feeding pipe, the mass percentage content of water in the raw coal in the raw material bin 1 is 13 percent, the middle diameter of a grinding disc 9 of the vertical grinding machine 2 is 1700mm, and the feeding amount is 35 t/h;
(2) raw coal in the raw material bin 1 is sent into a hot blast furnace 7 through a belt conveyor to be combusted to generate flue gas, and the flue gas is sent into an air inlet 8 of a vertical mill 2 through an air blower 6, wherein the air inlet temperature is 440 ℃;
(3) after a vertical grinding machine 2 is started and is spread and ground for 3 hours by a grinding disc 9 rotating in the vertical grinding machine 2 and a grinding roller 10 with rolling friction, a suction fan 14 draws air from an outlet at the top of the vertical grinding machine 2 side through a pulse dust collector 15, selects powder by a powder selecting device 12 of an external stationary impeller 121 and a movable impeller 122 rotating inside the stationary impeller 121 in the vertical grinding machine 2, sends a hot-air fine coal powder mixture into the pulse dust collector 15 through a finished product outlet, and returns hot air to a hot-air furnace 7 for cyclic utilization through a circulating pipeline 16 by an air cylinder of the suction fan 14;
the mill outlet air temperature is 92 ℃, and the mill outlet air quantity is 80000m3The differential pressure of the vertical mill 2 is 4.3kPa, and the coal material at the slag discharge port 13 of the vertical mill 2 returns to the raw material bin 1 through a material returning belt conveyer;
(4) the fine coal powder in the hot air fine coal powder mixture is blocked and falls down through a filter bag of a pulse dust collector 15, an electromagnetic pulse valve is opened at intervals to spray and expand to clean the filter bag, so that the falling fine coal powder falls into a conveyor, the conveyor at the bottom of the pulse dust collector 15 is a packing auger or a pipe chain machine, a sampling device is arranged in a blanking pipeline of the pulse dust collector 15, the sampling detection coal powder is lifted by a finished product lifter 17 and is conveyed into a finished product bin 18 through the conveyor, and an environment-friendly coal powder finished product with the water content of more than or equal to 200 meshes and less than or equal to 6% is obtained and is used for storage and transportation.
Example 3:
a hot air energy-saving environment-friendly pulverized coal processing technology comprises the following technological processes:
(1) the method comprises the following steps of (1) primarily crushing raw coal, screening by a 40-mesh sieve, falling onto an inclined belt conveyor, removing iron by an electromagnetic iron remover, and then conveying into a raw material bin 1 by the belt conveyor or a lifter for storage, wherein the raw coal is added with 7 parts of a calcium absorbent, 8 parts of an amino compound and 0.9 part of an oxide additive according to the mass fraction of 90 parts;
the calcium absorbent is prepared from limestone, dolomite, calcite and rhodochrosite in a mass ratio of 1:2: 1: 3, the amino compound is hydroxyl amide, cyclopropane carboxylic acid amide and ammonium formate according to the mass ratio of 1:2:1, and the oxide additive is boron trioxide, lanthanum oxide, ytterbium oxide and europium oxide according to the mass ratio of 2:2: 1: 1, preparing a composition;
raw coal in a raw material bin 1 is lifted by a belt conveyor directly or through a raw material lifter 4 and is sent into a feeding pipe of a vertical mill 2, the raw coal continuously and uniformly enters a feeding port 5 of the vertical mill 2 under the rotation action of an air locking feeding valve 3 of the feeding pipe, the mass percentage content of water in the raw coal in the raw material bin 1 is 17 percent, the middle diameter of a grinding disc 9 of the vertical mill 2 is 1900mm, and the feeding amount is 42 t/h;
(2) raw coal in the raw material bin 1 is sent into a hot blast stove 7 through a belt conveyor to be combusted to generate flue gas, and the flue gas is sent into an air inlet 8 of a vertical mill 2 through an air blower 6, wherein the air inlet temperature is 420 ℃;
(3) after a vertical grinding machine 2 is started and is spread and ground for 4 hours by a grinding disc 9 rotating in the vertical grinding machine 2 and a grinding roller 10 with rolling friction, a suction fan 14 draws air from an outlet at the top of the vertical grinding machine 2 side through a pulse dust collector 15, selects powder by a powder selecting device 12 of an external stationary impeller 121 and a movable impeller 122 rotating inside the stationary impeller 121 in the vertical grinding machine 2, sends a hot-air fine coal powder mixture into the pulse dust collector 15 through a finished product outlet, and returns hot air to a hot-air furnace 7 for cyclic utilization through a circulating pipeline 16 by an air cylinder of the suction fan 14;
the temperature of the mill air is 95 ℃, and the mill air quantity is 100000m3The differential pressure of the vertical mill 2 is 4.5kPa, and the coal material at the slag discharge port 13 of the vertical mill 2 returns to the raw material bin 1 through a material returning belt conveyer;
(4) the fine coal powder in the hot air fine coal powder mixture is blocked and falls down through a filter bag of a pulse dust collector 15, an electromagnetic pulse valve is opened at intervals to spray and expand to clean the filter bag, so that the falling fine coal powder falls into a conveyor, the conveyor at the bottom of the pulse dust collector 15 is a packing auger or a pipe chain machine, a sampling device is arranged in a blanking pipeline of the pulse dust collector 15, the sampling detection coal powder is lifted by a finished product lifter 17 and is conveyed into a finished product bin 18 through the conveyor, and an environment-friendly coal powder finished product with the water content of more than or equal to 200 meshes and less than or equal to 6% is obtained and is used for storage and transportation.
The mechanism of the invention is as follows:
when the environment-friendly pulverized coal is used as fuel, the calcium absorbent is thermally decomposed into calcium oxide, and the calcium oxide is combined with hydrogen sulfide or sulfur oxide which is cracked to generate volatile matters to obtain a solidified calcium sulfate compound, so that the desulfurization effect is achieved, the urea or amino compound is used as a reducing agent and is decomposed at high temperature to generate ammonia gas, and the ammonia gas reacts with nitric oxide generated by coal combustion to generate nitrogen gas, so that the synergistic desulfurization and denitrification effect is achieved;
when manganese dioxide, diboron trioxide and quartz sand are added for blending and burning, the fluidity is improved, active oxygen is decomposed and released, the mixture reacts with carbon under the condition of high temperature, full combustion is facilitated, the heat value is improved, rare earth oxides such as lanthanum oxide, cerium oxide, ytterbium oxide, europium oxide and the like are added, the dehydrogenation condensation reaction of coal dust combustion can be inhibited, the decarburization reaction is promoted, the coal dust combustion conversion rate is improved, the processing-assisting quality serving as a molding sand adding material is improved, the adhesion of the coal dust on the surface of grinding metal can be reduced, particle agglomeration is avoided through the interaction among particles, the flowing property of the grinding coal is improved, and the grinding energy consumption is reduced;
the invention adopts the raw coal to reduce the iron content through the electromagnetic iron remover and the sieving treatment, avoids the furnace surface coking phenomenon during the combustion, directly sends the raw coal into the feeding pipe of the vertical mill 2 through the belt conveyor or is lifted by the raw material lifter 4, meets the setting of different workshops, directly uses the belt conveyor for engineering vehicles to directly feed materials at a high position, continuously and uniformly enters the vertical mill 2 through the rotation of the air locking feeding valve 3, can avoid agglomeration, and improves the dispersion and grinding performance of the vertical mill 2;
the invention sets reasonable process conditions, the vertical mill 2 adopts the wind ring 11 on the millstone 9 to intake air from the bottom of the grinding, the flue gas generated by combustion in the hot blast stove 7 is dried in the grinding process, the oxygen content in the grinding atmosphere is reduced, the harmful gas structure such as nitric oxide, sulfur dioxide and the like is avoided being generated in the grinding process, the induced air mixes and draws out the hot-air fine coal powder from the outlet of the finished product, and the powder is selected by the external stationary impeller 121 and the movable impeller 122 powder selecting device 12 rotating inside the stationary impeller 121 in the vertical mill 2, so that the feeding, grinding, drying, grading and discharging are completed in one step in the vertical mill 2, the moisture absorption and agglomeration of the coal powder during transportation are avoided, the suction fan 14 exhausts air through the pulse dust collector 15, and the induced air blockage;
meanwhile, the sucked hot air returns to the hot blast stove 7 through a circulating pipeline 16 to recycle waste heat, energy consumption is saved, the quality of the environment-friendly coal dust finished product collected by the pulse dust collector 15 is ensured under the detection of a low-level detection device, and the environment-friendly coal dust finished product is conveyed to a high-level finished product bin 18 through a conveyor and a finished product elevator 17 to be stored so as to be convenient for direct transportation of an engineering truck;
examples of the invention1-3, the bulk density of the prepared environment-friendly pulverized coal is (0.45-0.5) t/m3Bulk density after storage time of (0.8-0.9) t/m3And carrying out performance detection, wherein the results are as follows:
| sequence number/item | Volatile matter (%) | Ash (%) | Radical sulfur (%) | Radical nitrogen (%) | Base carbon (%) | Char residue characteristics | Moisture (%) |
| Example 1 | 26.9 | 6.9 | 0.35 | 0.53 | 61.9 | 4 | 5.2 |
| Example 2 | 24.7 | 7.5 | 0.38 | 0.64 | 60.3 | 4 | 4.3 |
| Example 3 | 23.5 | 7.4 | 0.42 | 0.82 | 62.5 | 5 | 4.7 |
| Technical standard | ＜38 | ≤8 | ≤2 | ≤2 | 56-65 | 4-6 stages | ≤6 |
Therefore, the environment-friendly pulverized coal produced by the invention meets the technical standard, the number of equipment and the production period are reduced compared with the traditional process, the process flow is simplified, the processing treatment capacity and the production efficiency are improved, no raise dust is generated, the pulverized coal is prevented from absorbing moisture and agglomerating during transportation, the waste heat of drying hot air is effectively utilized, the phenomena that the equipment is stained with walls and blocked are avoided, the energy consumption is reduced by more than 30 percent, the occupied area is reduced by 2/3, and the environment-friendly pulverized coal batch processing production method is suitable for environment-friendly pulverized coal.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are also included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (7)
1. A hot air energy-saving environment-friendly pulverized coal processing technology is characterized by comprising the following technological processes:
(1) raw coal in a raw material bin is directly or lifted by a raw material lifter through a belt conveyor and is sent into a feeding pipe of a vertical mill, and the raw coal continuously and uniformly enters a feeding hole of the vertical mill under the rotation action of an air locking feeding valve of the feeding pipe;
(2) raw coal in a raw material bin is conveyed into a hot air furnace through a belt conveyor to be combusted to generate flue gas, and the flue gas is supplied into an air inlet of a vertical mill through air supply of an air blower, wherein the air inlet temperature is less than or equal to 450 ℃;
(3) after a vertical grinding machine is started and is spread and ground for 2-4 hours by a grinding roller which rotates in the vertical grinding machine and is in rolling friction, a suction fan draws air from an outlet at the top of the vertical grinding machine side through a pulse dust collector, powder is selected by an external stationary impeller and a movable impeller powder selecting device which rotates inside the stationary impeller in the vertical grinding machine, a hot air fine coal powder mixture is sent into the pulse dust collector through a finished product outlet, and a wind barrel of the suction fan returns hot air to a hot air furnace for cyclic utilization through a circulating pipeline;
(4) the fine coal powder in the hot air fine coal powder mixture is blocked and falls down through a filter bag of a pulse dust collector, an electromagnetic pulse valve is opened at intervals to spray and expand to clean the filter bag, so that the falling fine coal powder falls into a conveyor, is lifted by a finished product lifter and is conveyed into a finished product bin through the conveyor, and an environment-friendly coal powder finished product with the particle size of more than or equal to 200 meshes and the water content of less than or equal to 6% is obtained and is used for storage and transportation.
2. The hot-air energy-saving environment-friendly coal powder processing process according to claim 1, characterized in that in the step (1), the raw coal is primarily crushed, screened by a 25-55 mesh sieve, then dropped onto an inclined belt conveyor, and then sent into a raw material bin for storage through the belt conveyor or a lifter after being deironized by an electromagnetic deironing device.
3. The hot-air energy-saving environment-friendly coal powder processing process according to claim 1, characterized in that the raw coal in the step (1) is added with 5-12 parts of calcium absorbent, 4-8 parts of urea or amino compound and 0.5-1 part of oxide additive according to the mass fraction of 80-100 parts.
4. The hot-air energy-saving environment-friendly coal powder processing process according to claim 3, wherein the calcium absorbent is one or more of limestone, dolomite, marble, calcite or rhodochrosite, the amino compound is one or more of cyclopropylmethyl amide, hydroxyamide, cyclopropanecarboxylic acid amide or ammonium formate, and the oxide additive is one or more of manganese dioxide, diboron trioxide, quartz sand, lanthanum oxide, cerium oxide, ytterbium oxide and europium oxide.
5. The hot air energy-saving environment-friendly coal powder processing process as claimed in claim 1, wherein the raw coal in the raw coal bin in the step (1) has a moisture content of 6-18% by mass, the middle diameter of a grinding disc of a vertical mill is 1550-1900mm, and the feeding amount is 22-46 t/h.
6. The process for preparing pulverized coal with hot wind, energy conservation and environmental protection as claimed in claim 1, wherein the temperature of the milling wind in step (3) is 80-95 ℃, and the wind output is 65000 and 100000m3And h, the differential pressure of the vertical mill is 4-5kPa, and the coal at the slag discharge port of the vertical mill returns to the raw material bin through a material returning belt conveyor.
7. The hot air energy-saving environment-friendly pulverized coal processing process according to claim 1, wherein the conveyor at the bottom of the pulse dust collector in the step (4) is a packing auger or a pipe chain machine, and a sampling device is arranged in a blanking pipeline of the pulse dust collector to sample and detect pulverized coal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010453839.6A CN111570022A (en) | 2020-05-26 | 2020-05-26 | Hot air energy-saving environment-friendly pulverized coal processing technology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010453839.6A CN111570022A (en) | 2020-05-26 | 2020-05-26 | Hot air energy-saving environment-friendly pulverized coal processing technology |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111570022A true CN111570022A (en) | 2020-08-25 |
Family
ID=72109597
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010453839.6A Pending CN111570022A (en) | 2020-05-26 | 2020-05-26 | Hot air energy-saving environment-friendly pulverized coal processing technology |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111570022A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113457814A (en) * | 2021-06-22 | 2021-10-01 | 镇江市蓝火环保能源有限公司 | Coal powder treatment method |
| CN114289163A (en) * | 2021-12-31 | 2022-04-08 | 河南黎明重工科技股份有限公司 | Sodium bentonite processing method and system based on vertical roller mill |
| CN117282529A (en) * | 2023-09-28 | 2023-12-26 | 扬州一川镍业有限公司 | Heat recycling device and method for preparing pulverized coal by using same |
Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1334323A (en) * | 2000-07-19 | 2002-02-06 | 屈筠画 | Environment-protecting efficient additive for fuel coal |
| CN101015814A (en) * | 2007-02-08 | 2007-08-15 | 五环科技股份有限公司 | Technique for coal-grinding and drying |
| CN101220312A (en) * | 2008-01-29 | 2008-07-16 | 广西庆荣耐火材料有限公司 | Coal powder injection catalytic combustion burning-rate accelerator of blast furnace |
| CN101575541A (en) * | 2009-06-10 | 2009-11-11 | 煤炭科学研究总院 | System and process for coal powder preparation |
| CN102809148A (en) * | 2012-08-23 | 2012-12-05 | 郑州市鼎力干燥设备有限公司 | Re-combustion hot gas generating furnace |
| CN102974181A (en) * | 2012-11-14 | 2013-03-20 | 江苏中显集团有限公司 | Flue gas dedusting and desulfurization and denitrification craft and special device thereof |
| JP2014104395A (en) * | 2012-11-26 | 2014-06-09 | Hyuga Seirensho:Kk | System and method for preventing coal dust firing in pulverized coal mill equipment |
| CN104076056A (en) * | 2014-07-17 | 2014-10-01 | 天津钢铁集团有限公司 | Measuring method for cerium oxide content in coal injection additive |
| CN104449943A (en) * | 2014-12-23 | 2015-03-25 | 刘生金 | Fire coal combustion-supporting desulfurization powder for flue gas desulfurization and preparation method thereof |
| CN105567375A (en) * | 2014-10-09 | 2016-05-11 | 无锡荣博能源环保科技有限公司 | Composite additive |
| CN106190427A (en) * | 2016-08-17 | 2016-12-07 | 宫小奕 | A kind of boiler fired coal additive and preparation method thereof and using method |
| CN107013907A (en) * | 2017-06-13 | 2017-08-04 | 天津市热力有限公司 | A kind of pulverized-coal fired boiler waste heat from tail gas for pulverized coal preparation utilizes system |
| CN209519893U (en) * | 2018-12-26 | 2019-10-22 | 河南黎明重工科技股份有限公司 | A kind of coal dust preparation system |
| CN110694772A (en) * | 2019-10-21 | 2020-01-17 | 大峘集团有限公司 | Production process of slag and steel slag micropowder |
-
2020
- 2020-05-26 CN CN202010453839.6A patent/CN111570022A/en active Pending
Patent Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1334323A (en) * | 2000-07-19 | 2002-02-06 | 屈筠画 | Environment-protecting efficient additive for fuel coal |
| CN101015814A (en) * | 2007-02-08 | 2007-08-15 | 五环科技股份有限公司 | Technique for coal-grinding and drying |
| CN101220312A (en) * | 2008-01-29 | 2008-07-16 | 广西庆荣耐火材料有限公司 | Coal powder injection catalytic combustion burning-rate accelerator of blast furnace |
| CN101575541A (en) * | 2009-06-10 | 2009-11-11 | 煤炭科学研究总院 | System and process for coal powder preparation |
| CN102809148A (en) * | 2012-08-23 | 2012-12-05 | 郑州市鼎力干燥设备有限公司 | Re-combustion hot gas generating furnace |
| CN102974181A (en) * | 2012-11-14 | 2013-03-20 | 江苏中显集团有限公司 | Flue gas dedusting and desulfurization and denitrification craft and special device thereof |
| JP2014104395A (en) * | 2012-11-26 | 2014-06-09 | Hyuga Seirensho:Kk | System and method for preventing coal dust firing in pulverized coal mill equipment |
| CN104076056A (en) * | 2014-07-17 | 2014-10-01 | 天津钢铁集团有限公司 | Measuring method for cerium oxide content in coal injection additive |
| CN105567375A (en) * | 2014-10-09 | 2016-05-11 | 无锡荣博能源环保科技有限公司 | Composite additive |
| CN104449943A (en) * | 2014-12-23 | 2015-03-25 | 刘生金 | Fire coal combustion-supporting desulfurization powder for flue gas desulfurization and preparation method thereof |
| CN106190427A (en) * | 2016-08-17 | 2016-12-07 | 宫小奕 | A kind of boiler fired coal additive and preparation method thereof and using method |
| CN107013907A (en) * | 2017-06-13 | 2017-08-04 | 天津市热力有限公司 | A kind of pulverized-coal fired boiler waste heat from tail gas for pulverized coal preparation utilizes system |
| CN209519893U (en) * | 2018-12-26 | 2019-10-22 | 河南黎明重工科技股份有限公司 | A kind of coal dust preparation system |
| CN110694772A (en) * | 2019-10-21 | 2020-01-17 | 大峘集团有限公司 | Production process of slag and steel slag micropowder |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113457814A (en) * | 2021-06-22 | 2021-10-01 | 镇江市蓝火环保能源有限公司 | Coal powder treatment method |
| CN114289163A (en) * | 2021-12-31 | 2022-04-08 | 河南黎明重工科技股份有限公司 | Sodium bentonite processing method and system based on vertical roller mill |
| CN114289163B (en) * | 2021-12-31 | 2023-08-29 | 河南黎明重工科技股份有限公司 | Sodium bentonite processing method and system based on vertical roller mill |
| CN117282529A (en) * | 2023-09-28 | 2023-12-26 | 扬州一川镍业有限公司 | Heat recycling device and method for preparing pulverized coal by using same |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| AU2014337792B2 (en) | A method and a system for producing a lightweight ceramic aggregate, particularly from coal ash | |
| CN1242075C (en) | Apparatus and method for recycling iron laden dust and sludge in ingot iron manufacturing process using semi-soft coking coal and fine iron ore | |
| CN101893384A (en) | Method of sintering low temperature waste heat circulation and discharged waste gas reduction and device thereof | |
| CN108796217B (en) | Device and method for recycling zinc-containing and iron-containing dust mud | |
| CN111570022A (en) | Hot air energy-saving environment-friendly pulverized coal processing technology | |
| CN103344114B (en) | A kind of novel energy-saving emission-reducing sintering machine system and sintering method | |
| CN110274463A (en) | A kind of pure sintering system and method based on fuel formulations and roasting control | |
| CN210399936U (en) | Clean sintering system based on fuel preparation and roasting control | |
| CN1261598C (en) | Method for reclaiming and reusing iron-making dust in blast furnace | |
| CN212451336U (en) | System for utilize flue gas tail gas preparation buggy | |
| CN110777226A (en) | Combustion improver for blast furnace coal injection by taking fly ash as partial raw material and use method thereof | |
| CN114774680A (en) | Mixed treatment method of Bayer process red mud and converter OG mud | |
| CN110592304B (en) | Iron ore powder pretreatment process | |
| CN209210889U (en) | A kind of refractory iron ore suspension heating-coal base magnetizing roast system | |
| CN220579348U (en) | Phosphorite shaft furnace roasting production system | |
| CN113249566B (en) | Sintering system and method for limonite type laterite-nickel ore | |
| CN116218579B (en) | Desulfurization and dehydration production device for high-sulfur high-moisture lignite | |
| CN110553504B (en) | Method for drying semi-coke by taking calcium carbide furnace purified ash as fuel | |
| CN211170806U (en) | Clean iron ore agglomeration system | |
| CN215312766U (en) | Crushing and high-temperature flue gas drying equipment for smelting reduction of coal powder | |
| CN103589865A (en) | Method for producing metallized pellets by direct reduction of powdered iron by carbon cycle oxygenation | |
| CN221028592U (en) | Zinc-containing solid waste thermal agglomeration system | |
| CN213357374U (en) | System for utilize heavy metal contaminated soil preparation building material | |
| CN219244300U (en) | Vertical cooling waste heat recovery production system for pellets | |
| CN110699141B (en) | Chain grate-rotary kiln injected biomass fuel and preparation method and application thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200825 |