CN109929573A - The method and system of power plants generating electricity coupling production clean coal - Google Patents
The method and system of power plants generating electricity coupling production clean coal Download PDFInfo
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- CN109929573A CN109929573A CN201711353268.3A CN201711353268A CN109929573A CN 109929573 A CN109929573 A CN 109929573A CN 201711353268 A CN201711353268 A CN 201711353268A CN 109929573 A CN109929573 A CN 109929573A
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The present invention relates to power plants generating electricities to couple field with clean coal production, discloses the method and system of power plants generating electricity coupling production clean coal.This method comprises: (1) carries out coal conversion with the first flue gas indirect heating raw coal from boiler of power plant, final conversion temperature is 500~640 DEG C, and transformation time is 10~60min, obtains the first flue gas, the first pyrolysis gas and conversion coal；(2) coal removing impurities is carried out with the second flue gas indirect heating moisture-free coal from boiler of power plant, final removing impurities temperature is 650~750 DEG C, and the removing impurities time is 10~60min, obtains the second flue gas, the second pyrolysis gas and removing impurities coal；(3) pyrolysis gas is subjected to tar removing, obtains burnt oil and gas；(4) coal gas is burnt and is exchanged heat, obtained steam and tail gas returns to boiler of power plant for generating electricity；First flue gas and the second flue gas are converged into return boiler of power plant.Low order raw coal is produced as clean coal while realizing the production of power plant's normal power generation.
Description
Technical field
The present invention relates to power plants generating electricities to couple field with clean coal production, couples and gives birth to more particularly to a kind of power plants generating electricity
Produce the method and system of clean coal.
Background technique
China is in energy consumption structure, and the consumption of coal is in the highest flight.Wherein coal fired power generation is the main of coal consumption
Form.But pollutant emission is generated due to fire coal and is influenced by coal price, the power generation production of coal-fired firepower electrical plant is in recent years
There are losses due to poor management, coal-burning power plant's rate of load condensate is integrally lower, constrain the sustainable development of power industry.
In addition the flue gas emission that coal-fired process generates is the major reason for causing haze.In recent years, Beijing-tianjin-hebei Region is for I
The area of state's atmosphere pollution most serious, the whole nation, which is polluted in most heavy first 10, has 8 cities in Beijing-tianjin-hebei Region.For with administering Jing-jin-ji region
The increasingly serious atmosphere polluting problem in area, country have put into effect policy document in succession, carry out action and administer atmospheric environment.With fire coal
Power plant compares, and 300,000,000 tons or so of civilian scattered burning coal, coal quality is poor, pollutant catabolic gene difficulty is big, is acknowledged as atmosphere pollution and controls
Reason field is difficult to " cancer " cured.Therefore scattered coal is cleaned extremely urgent.
Therefore, power plants generating electricity production and scattered coal, which are cleaned, develops focus of attention as current coal and electricity power enterprise.
CN106382790A discloses a kind of brown coal drying method using power-plant flue gas and steam waste heat, comprising: (1)
Primary drying processing is carried out to moist material using the high-temperature flue gas that coal-fired boiler in power plant directly excludes；The high-temperature flue gas is straight
It connects and is uniformly contacted with moist material, obtain intermediate material；(2) the high temperature cigarette for recycling coal-fired boiler in power plant directly to exclude
Gas and steam carry out redrying processing to intermediate material simultaneously；The high-temperature flue gas is directly uniformly connect with intermediate material
Touching, while intermediate material uniformly contacts with the heat exchanger tube for being connected with steam and carries out heat exchange, obtains dried material, realizes secondary dry
Dry processing.This method is only able to achieve combining for power-plant flue gas and the drying of coal, but how to solve power plant and cleaning without enlightenment
Coal produces the problem of joint.
CN102350214A discloses a kind of coal-fired power plant coal dust prepared activated coke flue gas comprehensive purification technique, comprising: 1)
The coal dust of coal dust storage tank is carried by compressed air, is pumped into carbonization-activation furnace by pulverized coal bin, while from the extraction section temperature that comes
Heat source and activator are carbonized as coal dust for 500-1200 DEG C of flue gas, is sent into the bottom of activated charcoal activation furnace, it is mixed with coal dust
It closes, flue gas carries the bottom-up movement of coal dust, while charing and priming reaction occurs, and obtains powdered activated coke；2) flue gas carries
Activated coke enters separator and realizes that gas solid separation, the activated coke isolated are sent into after cooler is cooling through active coke bin pump II
Activated coke storage tank is stored；The pyrolysis gas that separator is isolated is sent into the reducing zone of boiler as reburning fuel, by main combustion
Burn the NO that area generatesxIt is reduced into N2, realize NOxPartial removal；3) flue gas being discharged from boiler is after pre-duster is handled
Into adsorption tower, it is sufficiently mixed in adsorption tower with the activated coke being sent by activated coke storage tank；Water pump extracts in technique water tank
Water, by nozzle spray into adsorption tower in, adjust the temperature of flue gas, 60-120 DEG C at a temperature of flue gas in SO2It is active with mercury
Coke absorption；Ammonia conveying fan extracts the ammonia in ammonia tank and sprays into ammonia by the ammonia nozzle on adsorption tower top, with flue gas
In NOxRedox reaction occurs and generates N2, realize NOxRemoving；4) purified flue gas enters cloth bag separator progress
Gas solid separation, purified gas are sent into chimney by air-introduced machine and are directly discharged into atmosphere, and isolated activated coke a part is given by spiral
Material machine, which is sent into adsorption tower, participates in circulation, and another part, which is sent into regenerating furnace, to be regenerated；5) activated coke after regenerating is through cooling
Activated coke storage tank is sent by active coke bin pump I after device II is cooling to recycle；It is 20-60%'s that concentration is obtained in regenerative process
Sulphur dioxide enrichment gas realizes the resource utilization of sulfur dioxide；6) activated coke loses absorption after multiple absorption/regeneration
The useless activated coke for losing absorption property is sent into boiler combustion, makes full use of the energy of activated coke by performance.This method is for solving
Coal is produced activated coke using flue gas, recycles activated coke and the pyrolysis gas of generation real by the certainly pollutant emission of power-plant flue gas
Now reduce the pollutant emission of flue gas, but without reference to and enlighten how to utilize power-plant flue gas production clean coal and existing
Technical problem.
US20170137731A1 discloses a kind of method of coal increasing matter, is removed in coal by heating coal under anaerobic twice
The moisture and by-product contained promotes coal quality, obtains the coal for increasing matter；The by-product burning of discharge is recycled simultaneously as heating coal
Heat source, save energy.First heating is about 400 ℉ (204 DEG C), the second heating about 1500 ℉ (815.6 DEG C).The party
Method only discloses the method that raw coal can be produced as to clean coal, but without reference to how realizing power-plant flue gas and clean coal
The technical issues of being encountered in the joint of production and the combined process.
CN10664459A discloses a kind of process of coal pyrogenic decomposition of multi-stage rotary, comprising the steps of: (1) by granularity 3-30mm
Feed coal be sent into the hot flue gases in dry rotary furnace with temperature lower than 300 DEG C and directly exchange heat dehydration, final drying temperature
It is 200-250 DEG C；(2) coal charge after drying is sent into pyrolysis rotary furnace, the heat that coal charge is provided by pyrolysis heater is indirect
Heating decomposes and generates granular carbocoal, tar steam and coal gas, and final pyrolysis temperature is 500-650 DEG C；(3) by tar steam
It is sent in condenser and separates with the gaseous mixture of coal gas, obtain crude tar oil and coal gas；(4) granular carbocoal is sent into carburetting rotary furnace
In, 800-850 DEG C at a temperature of, heated through internal heat type, obtain shot coke and high-temperature gas mixture, gaseous mixture is imported into pyrolysis
Heating furnace；(5) shot coke being discharged by carburetting rotary furnace is put out into head in water spray on vibrating screen, it is burnt that product is made.The technique carries out
The pyrolysis process of coal, using plural serial stage rotary furnace and segmentally heating mode, the heat that wherein dryer section is discharged with pyrolysis heater
Flue gas is dried medium, heat needed for pyrolysis section provides pyrolysis by pyrolysis heater, the same air of the heat, pyrolysis coal gas
Or other fuel burn generation in heating furnace.The technique produces to obtain burnt, burnt oil and gas for pyrolysis of coal, does not relate to
And how utilize power-plant flue gas Joint Production clean coal, and how stable power plants generating electricity produce the problem of.
In conclusion method disclosed in the prior art does not account for how joining power-plant flue gas and clean coal production
It closes, it is desirable to provide the method for realizing balance power plants generating electricity production and coal clean manufacturing.
Summary of the invention
The purpose of the invention is to how solve to realize combining for power plants generating electricity and coal clean manufacturing, and two can be balanced
Person produces stable problem, provides the method and system of power plants generating electricity coupling production clean coal, may be implemented to utilize power plant
Hot fume carries out the production of clean coal and does not influence the power generation production of power plant simultaneously, can also obtain coal tar.
To achieve the goals above, first aspect present invention provides a kind of method of power plants generating electricity coupling production clean coal,
Include:
(1) with the first flue gas indirect heating raw coal of 800~1200 DEG C from boiler of power plant, coal conversion, institute are carried out
The final conversion temperature for stating coal conversion is 500~640 DEG C, and transformation time is 10~60min, obtains the first flue gas, the first pyrolysis
Gas and conversion coal；
(2) the second flue gas indirect heating of 800~1200 DEG C of coal from boiler of power plant of conversion is subjected to coal
Removing impurities, the final removing impurities temperature of the coal removing impurities are 650~750 DEG C, and the removing impurities time is 10~60min, obtain the second flue gas,
Second pyrolysis gas and removing impurities coal；
(3) tar removing is carried out after converging the first pyrolysis gas and the second pyrolysis gas, obtains burnt oil and gas；
(4) coal gas is burnt and is exchanged heat, obtained steam and tail gas；The steam and tail gas return to power plant
Boiler is for generating electricity；First flue gas and the second flue gas are converged to return to flue gas feeding boiler of power plant and being used to generate electricity；
(5) removing impurities coal is carried out dry and cold obtaining clean coal.
Preferably, the temperature of first flue gas and the second flue gas is 900~1000 DEG C.
Preferably, the total flow of first flue gas and the second flue gas is the stream for the flue gas that boiler of power plant generates
1~30 volume %, preferably 5~20 volume %, more preferably 5~10 volume % of amount.
Preferably, the volume ratio between first flue gas and the second flue gas is (1~4): 1, further preferably
(1~2): 1.
Preferably, relative to 10000Nm3First flue gas and the second flue gas total flow, the raw coal
Inlet amount is 3000~6000kg, further preferably 4000~5000kg.
Preferably, the ratio between the transformation time and removing impurities time are (1~2): 1.
Preferably, the temperature for returning to flue gas is 750~900 DEG C；The temperature of the steam is 750~900 DEG C；Institute
The temperature for stating tail gas is 300~500 DEG C, preferably 350~450 DEG C；The total flow for returning to flue gas and tail gas is described the
100~130 volume % of the total flow of one flue gas and the second flue gas, preferably 100~120 volume %, more preferably
105~120 volume %.
Preferably, the raw coal is at least one of lignite, jet coal and the dross coal of 1~100mm of granularity.
Second aspect of the present invention provides a kind of system using power plants generating electricity coupling production clean coal of the invention, comprising:
Boiler of power plant 1, raw coal removing impurities unit, condenser 6, mixed-burning furnace 7, waste heat boiler 8, dry and cold device 5 and blower unit 2；Wherein,
For the raw coal removing impurities unit for the flue gas from boiler of power plant 1 to be carried out indirect heating to raw coal, removal is former
Impurity in coal obtains flue gas, pyrolysis gas and removing impurities coal, and flue gas is returned to boiler of power plant power generation；
Condenser 6 is used to recycle the tar in the pyrolysis gas from raw coal removing impurities unit, and obtains coal gas；
Mixed-burning furnace 7 burns for the coal gas of condenser in future 6, and by obtained hot wind be passed through waste heat boiler 8 with
Boiler feedwater carries out heat exchange and obtains steam and tail gas；
Waste heat boiler 8 is connected to boiler of power plant 1 and blower unit 2, and the steam returns to boiler of power plant 1, and the tail gas is through drawing
Wind apparatus 2 returns to boiler of power plant 1；
Dry and cold device 5 by dry and cold method for being cooled down to obtain clean coal removing impurities coal.
Preferably, the raw coal removing impurities unit includes reforming unit 3 and removing impurities device 4, wherein
Reforming unit 3 is connected to boiler of power plant 1, removing impurities device 4 and condenser 6；Removing impurities device 4 is connected to boiler of power plant 1, turns
3, condenser 6 and dry and cold device 5 are set in makeup.
Through the above technical solutions, present invention control comes from power plant flue gas, certain temperature and flow proportional respectively with
Raw coal, conversion coal carry out indirect heating, realize the segmentally heating of raw coal.Staged operation can the more flexible heating for controlling each section
Operation is conducive to preferably produce clean coal.Raw coal and conversion coal are heated by high-temperature flue gas in the present invention, can take off
Except impurity, the obtained clean coals such as volatile matter, sulfide, mercury in coal can reduce pollutant emission when coal combustion.Cleaning
Coal quality can achieve the quality standard of household coal as defined in DB13-2081-2014 standard.
Furthermore the pyrolysis gas that method of the invention generates can propose tar, and obtained coal gas passes through mixed-burning furnace and waste heat
Boiler can return again to power plants generating electricity in the form of steam and tail gas by the heat in gas recovery.Returning to flue gas can be used for
Power plants generating electricity production.Tail gas clean-up can use the existing device of power plant simultaneously.
Method of the invention can use the existing flue gas processing device of power-plant flue gas waste heat and power plant, it is possible to reduce electricity
The consumption of coal of factory's power generation, can be reduced the heat source of clean coal production system and the investment of vent gas treatment.
Detailed description of the invention
Fig. 1 is a kind of flow diagram of the method and system of power plants generating electricity coupling production clean coal provided by the invention.
Specific embodiment
The endpoint of disclosed range and any value are not limited to the accurate range or value, these ranges herein
Or value should be understood as comprising the value close to these ranges or value.For numberical range, the endpoint value of each range it
Between, can be combined with each other between the endpoint value and individual point value of each range, and individually between point value and obtain one
Or multiple new numberical ranges, these numberical ranges should be considered as specific open herein.
First aspect present invention provides a kind of method of power plants generating electricity coupling production clean coal, as shown in Figure 1, comprising:
(1) with the first flue gas indirect heating raw coal of 800~1200 DEG C from boiler of power plant, coal conversion, institute are carried out
The final conversion temperature for stating coal conversion is 500~640 DEG C, and transformation time is 10~60min, obtains the first flue gas, the first pyrolysis
Gas and conversion coal；
(2) the second flue gas indirect heating of 800~1200 DEG C of coal from boiler of power plant of conversion is subjected to coal
Removing impurities, the final removing impurities temperature of the coal removing impurities are 650~750 DEG C, and the removing impurities time is 10~60min, obtain the second flue gas,
Second pyrolysis gas and removing impurities coal；
(3) tar removing is carried out after converging the first pyrolysis gas and the second pyrolysis gas, obtains burnt oil and gas；
(4) coal gas is burnt and is exchanged heat, obtained steam and tail gas；The steam and tail gas return to power plant
Boiler is for generating electricity；First flue gas and the second flue gas are converged to return to flue gas feeding boiler of power plant and being used to generate electricity；
(5) removing impurities coal is carried out dry and cold obtaining clean coal.
Preferably, the final conversion temperature is 500~600 DEG C, and the transformation time is 30~45min.
Preferably, the final removing impurities temperature is 650~700 DEG C, and the removing impurities time is 30~45min.
In the present invention, clean coal production is carried out using the hot flue gases from power plant, while the power generation for not influencing power plant is raw
It produces.Step (1) if in carry out the coal conversion and can be realized first flue gas to the indirect heating of the raw coal i.e.
Can, it can be carried out in rotary kiln, tower moving bed or rake moving bed, realize the light objects such as moisture, the volatile component in raw coal
The removal of matter.Preferably, the temperature of first flue gas and the second flue gas is 900~1000 DEG C.
In the present invention, the hot flue gases that first flue gas and the second flue gas are produced from boiler of power plant, Ke Yiyong
It is produced in power generation.It can be used as the heat source of clean coal production in the present invention using the hot flue gases.Heat can be generated according to power plant
The flow of flue gas and the amount for needing to produce clean coal, draw hot flue gases according to a certain percentage.Preferably, described first
The total flow of flue gas and the second flue gas is 1~30 volume % of the total flow for the flue gas that boiler of power plant generates, preferably
5~20 volume %, more preferably 5~10 volume %.By this restriction, method provided by the invention can satisfy the life of clean coal
It produces, and step (4) coal gas can continue through mixed-burning furnace, the heat of waste heat boiler conversion, return flue gas return power plant
The power generation production of power plant is provided, power generation production is not influenced.
In the present invention, first flue gas and the second flue gas are respectively used to step (1) and step (2), are respectively used to
Handle the raw coal and the conversion coal.Each plant demand of first flue gas and the second flue gas meets the coal conversion
With the condition of coal removing impurities, and guarantee that pyrolysis gas and flue gas return to boiler of power plant and can continue to provide the power generation production of power plant, not shadow
Ring power generation production.Preferably, the volume ratio between first flue gas and the second flue gas is (1~4): 1, it is further excellent
It is selected as (1~2): 1.Under this restriction, production cleaning while power plants generating electricity production is may be implemented in method provided by the invention
Coal.
It, can be real under conditions of the coal removing impurities still through the mode of indirect heating in step (2) in the present invention
The impurity such as the mercury contained in the moisture-free coal are now removed, clean the conversion coal more.The coal removing impurities is carried out in step (2)
As long as can be realized second flue gas to it is described conversion coal indirect heating, can be in rotary kiln, tower moving bed
Or it is carried out in rake moving bed.
In the present invention, it is preferable that relative to 10000Nm3First flue gas and the second flue gas total flow,
The inlet amount of the raw coal is 3000~6000kg, further preferably 4000~5000kg, can guarantee both to complete original in this way
Coal is produced as clean coal, and guarantees that returning to flue gas, steam and tail gas return power plant can still continue to provide the power generation life of power plant
It produces.
In the present invention, it is preferable that the ratio between the transformation time and removing impurities time are (1~2): 1.It can guarantee clean coal
Production, while return to flue gas, steam and tail gas return to power plant can still continue on for the power generation production of power plant.
In the present invention, while producing clean coal using the flue gas of boiler of power plant, pyrolysis gas separation can also will be obtained
Tar out obtains tar product.Tar removing can use the measure of this field conventional technique, and can be will converge
First pyrolysis gas and the second pyrolysis gas are condensed, to isolate tar and obtain coal gas.
In the present invention, further, the coal gas can be after burning and heat exchange, in the form of steam and tail gas
Return to boiler of power plant power generation.The coal gas can be sent into mixed-burning furnace to be burnt to obtain hot wind, then hot wind is sent into waste heat boiler
Furnace and boiler feedwater carry out heat exchange and generate steam and tail gas.Preferably, the temperature of the steam is 750~900 DEG C.
In the present invention, the tail gas returns to boiler of power plant in the form of return air.Preferably, the temperature of the tail gas is 300
~500 DEG C, preferably 350~450 DEG C.
In the present invention, it is preferable that the temperature for returning to flue gas is 750~900 DEG C.
In the present invention, it is preferable that the flue gas and the total flow of tail gas of returning is first flue gas and the second flue
100~130 volume % of the total flow of gas, preferably 100~120 volume %, more preferably 105~120 volume %.
In the present invention, the removing impurities coal refers in method provided by the invention, and raw coal is removed through the processing of dry and removing impurities
Obtained after impurity without cooling coal.
In the present invention, the raw coal can be with there is no particular limitation.Preferably, the raw coal is 1~100mm's of granularity
At least one of lignite, jet coal and dross coal.
In the present invention, the quality of obtained clean coal meets DB13-2081-2014 standard.
Second aspect of the present invention provides the system of a kind of method of application power plants generating electricity coupling production clean coal of the present invention,
The system of the method application of power plants generating electricity coupling production clean coal of the invention, comprising: include: boiler of power plant 1, raw coal removing impurities
Unit, condenser 6, mixed-burning furnace 7, waste heat boiler 8, dry and cold device 5 and blower unit 2；Wherein,
Raw coal removing impurities unit removes in raw coal for the flue gas from boiler of power plant 1 to be carried out indirect heating to raw coal
Impurity, obtain flue gas, pyrolysis gas and removing impurities coal, and flue gas is returned into boiler of power plant power generation；
Condenser 6 is used to recycle the tar in the pyrolysis gas from raw coal removing impurities unit, and obtains coal gas；
Mixed-burning furnace 7 burns for the coal gas of condenser in future 6, and by obtained hot wind be passed through waste heat boiler 8 with
Boiler feedwater carries out heat exchange and obtains steam and tail gas；
Waste heat boiler 8 is connected to boiler of power plant 1 and blower unit 2, and the steam returns to boiler of power plant 1, and the tail gas is through drawing
Wind apparatus 2 returns to boiler of power plant 1；
Dry and cold device 5 by dry and cold method for being cooled down to obtain clean coal removing impurities coal.
In the present invention, it is preferable that the raw coal removing impurities unit includes reforming unit 3 and removing impurities device 4, wherein
Reforming unit 3 is connected to boiler of power plant 1, removing impurities device 4 and condenser 6；Removing impurities device 4 is connected to boiler of power plant 1, turns
3, condenser 6 and dry and cold device 5 are set in makeup.
In the present invention, reforming unit 3 can be selected from rotary kiln, tower moving bed or rake moving bed.
In the present invention, removing impurities device 4 can be selected from rotary kiln, tower moving bed or rake moving bed.
In the present invention, the existing dry equipment for putting out method is can be used in dry and cold device 5.
In the present invention, condenser 6 can be the equipment that this field is removed conventionally used for tar, meet in recycling pyrolysis gas
Tar.
In the present invention, there is no particular limitation for mixed-burning furnace 7, and the burning of realization pyrolysis gas commonly used in the art is set
It is standby.
In the present invention, waste heat boiler 8 can be the conventional use of realization hot wind in this field and exchange heat with boiler feedwater
Equipment.
The present invention will be described in detail by way of examples below.
The clean coal that embodiment and comparative example obtains is according to DB13-2081-2014 standard test sulfur content, ash content sulfur-bearing
And volatile matter content.
The 0.4 weight % of total sulphur content < of regulation clean coal in DB13-2081-2014 standard, 16 weight of content of ashes <
Measure % and 10 weight % of volatile matter content <.
Embodiment 1
(1) by 5000Nm3(lignite, partial size are raw coal of the first flue gas (900 DEG C) of/h to 4500kg in rotary kiln
20mm) indirect heating, carry out coal convert 45min, final conversion temperature be 600 DEG C, obtain the first flue gas, the first pyrolysis gas and
Convert coal；
(2) by 5000Nm3The second flue gas (900 DEG C) of/h carries out coal removing impurities to coal indirect heating is converted in rotary kiln
35min, final removing impurities temperature are 650 DEG C, obtain the second flue gas, the second pyrolysis gas and removing impurities coal；
(3) progress of removing impurities coal is dry and cold, obtain clean coal；
(4) tar removing is carried out after converging the first and second pyrolysis gas, obtains tar product；Coal gas will be obtained simultaneously
It is passed through mixed-burning furnace to burn, obtained hot wind is passed through waste heat boiler and boiler feedwater carries out heat exchange and generates steam and tail gas, steams
Vapour (800 DEG C of temperature) is back to boiler of power plant for generating electricity, and tail gas returns to electricity through blower unit as return air (450 DEG C of temperature)
Factory's boiler is for generating electricity；First and second flue gases are converged to return to (800 DEG C) feeding boiler of power plant of flue gas for generating electricity；It returns
Wind and the flow for returning to flue gas are 12000Nm3/h；
The total flow of first flue gas and the second flue gas is equivalent to 5 volume % of boiler of power plant flue gas total flow.
Quality, the flue gas generated energy, (steam+tail gas+return flue gas) generated energy for measuring clean coal, the results are shown in Table 1.
Embodiment 2
(1) 6500Nm is used3The first flue gas (1000 DEG C) of/h (does not glue the raw coal of the 4000kg in tower moving bed
Coal, partial size 30mm) indirect heating, it carries out coal and converts 30min, final conversion temperature is 500 DEG C, obtains the first flue gas, first
Pyrolysis gas and conversion coal；
(2) 3500Nm is used3The second flue gas (1000 DEG C) of/h carries out coal to the conversion coal indirect heating in rotary kiln
Removing impurities 30min, final removing impurities temperature are 700 DEG C, obtain the second flue gas, the second pyrolysis gas and removing impurities coal；
(3) progress of removing impurities coal is dry and cold, obtain clean coal；
(4) tar removing is carried out after converging the first and second pyrolysis gas, obtains tar product；Coal gas will be obtained simultaneously
It is passed through mixed-burning furnace to burn, obtained hot wind is passed through waste heat boiler and boiler feedwater carries out heat exchange and generates steam and tail gas, steams
Vapour (900 DEG C of temperature) is back to boiler of power plant for generating electricity, and tail gas returns to electricity through blower unit as return air (350 DEG C of temperature)
Factory's boiler is for generating electricity；First and second flue gases are converged to return to (900 DEG C) feeding boiler of power plant of flue gas for generating electricity；It returns
Wind and the total flow for returning to flue gas are 11000Nm3/h；
The total flow of first flue gas and the second flue gas is equivalent to 10 volume % of boiler of power plant flue gas total flow.
Quality, the flue gas generated energy, (steam+tail gas+return flue gas) generated energy for measuring clean coal, the results are shown in Table 1.
Embodiment 3
(1) 6000Nm is used3Raw coal (long flame of the first flue gas (950 DEG C) of/h to the 5000kg in tower moving bed
Coal, partial size 3mm) indirect heating, it carries out coal and converts 40min, final conversion temperature is 550 DEG C, obtains the first flue gas, first
Pyrolysis gas and conversion coal；
(2) 4000Nm is used3It is de- to carry out coal to the conversion coal indirect heating in rotary kiln for the first flue gas (950 DEG C) of/h
Miscellaneous 30min, final removing impurities temperature are 650 DEG C, obtain the second flue gas, the second pyrolysis gas and removing impurities coal；
(3) progress of removing impurities coal is dry and cold, obtain clean coal；
(4) tar removing is carried out after converging the first and second pyrolysis gas, obtains tar product；Coal gas will be obtained simultaneously
It is passed through mixed-burning furnace to burn, obtained hot wind is passed through waste heat boiler and boiler feedwater carries out heat exchange and generates steam and tail gas, steams
Vapour (750 DEG C of temperature) is back to boiler of power plant for generating electricity, and tail gas returns to electricity through blower unit as return air (400 DEG C of temperature)
Factory's boiler is for generating electricity；First and second flue gases are converged to return to (750 DEG C) feeding boiler of power plant of flue gas for generating electricity；It returns
Wind and the total flow for returning to flue gas are 105000Nm3/h；
The total flow of first flue gas and the second flue gas is equivalent to 8 volume % of boiler of power plant flue gas total flow.
Quality, the flue gas generated energy, (steam+tail gas+return flue gas) generated energy for measuring clean coal, the results are shown in Table 1.
Embodiment 4
(1) by 5000Nm3(lignite, partial size are raw coal of the first flue gas (800 DEG C) of/h to 4500kg in rotary kiln
20mm) indirect heating, carry out coal convert 45min, final conversion temperature be 600 DEG C, obtain the first flue gas, the first pyrolysis gas and
Convert coal；
(2) by 5000Nm3The second flue gas (800 DEG C) of/h carries out coal removing impurities to coal indirect heating is converted in rotary kiln
40min, final removing impurities temperature are 650 DEG C, obtain the second flue gas, the second pyrolysis gas and removing impurities coal；
(3) progress of removing impurities coal is dry and cold, obtain clean coal；
(4) tar removing is carried out after converging the first and second pyrolysis gas, obtains tar product；Coal gas will be obtained simultaneously
It is passed through mixed-burning furnace to burn, obtained hot wind is passed through waste heat boiler and boiler feedwater carries out heat exchange and generates steam and tail gas, steams
Vapour (800 DEG C of temperature) is back to boiler of power plant for generating electricity, and tail gas returns to electricity through blower unit as return air (450 DEG C of temperature)
Factory's boiler is for generating electricity；First and second flue gases are converged to return to (800 DEG C) feeding boiler of power plant of flue gas for generating electricity；It returns
Wind and the total flow for returning to flue gas are 12000Nm3/h；
The total flow of first flue gas and the second flue gas is equivalent to 5 volume % of boiler of power plant flue gas total flow.
Quality, the flue gas generated energy, (steam+tail gas+return flue gas) generated energy for measuring clean coal, the results are shown in Table 1.
Embodiment 5
(1) by 5000Nm3(lignite, partial size are raw coal of the first flue gas (1200 DEG C) of/h to 4500kg in rotary kiln
20mm) indirect heating, carry out coal convert 45min, final conversion temperature be 600 DEG C, obtain the first flue gas, the first pyrolysis gas and
Convert coal；
(2) by 5000Nm3The second flue gas (120 DEG C) of/h carries out coal removing impurities to coal indirect heating is converted in rotary kiln
40min, final removing impurities temperature are 650 DEG C, obtain the second flue gas, the second pyrolysis gas and removing impurities coal；
(3) progress of removing impurities coal is dry and cold, obtain clean coal；
(4) tar removing is carried out after converging the first and second pyrolysis gas, obtains tar product；Coal gas will be obtained simultaneously
It is passed through mixed-burning furnace to burn, obtained hot wind is passed through waste heat boiler and boiler feedwater carries out heat exchange and generates steam and tail gas, steams
Vapour (800 DEG C of temperature) is back to boiler of power plant for generating electricity, and tail gas returns to electricity through blower unit as return air (450 DEG C of temperature)
Factory's boiler is for generating electricity；First and second flue gases are converged to return to (800 DEG C) feeding boiler of power plant of flue gas for generating electricity；It returns
Wind and the total flow for returning to flue gas are 12000Nm3/h；
The total flow of first flue gas and the second flue gas is equivalent to 5 volume % of boiler of power plant flue gas total flow.
Quality, the flue gas generated energy, (steam+tail gas+return flue gas) generated energy for measuring clean coal, the results are shown in Table 1.
Embodiment 6
(1) by 8000Nm3(lignite, partial size are raw coal of the first flue gas (900 DEG C) of/h to 4500kg in rotary kiln
20mm) indirect heating carries out coal and converts 45min, and final conversion temperature is to obtain the first flue gas, the first pyrolysis gas at 600 DEG C
With conversion coal；
(2) by 2000Nm3The second flue gas (900 DEG C) of/h carries out coal removing impurities to coal indirect heating is converted in rotary kiln
40min, final removing impurities temperature are 650 DEG C, obtain the second flue gas, the second pyrolysis gas and removing impurities coal；
(3) progress of removing impurities coal is dry and cold, obtain clean coal；
(4) tar removing is carried out after converging the first and second pyrolysis gas, obtains tar product；Coal gas will be obtained simultaneously
It is passed through mixed-burning furnace to burn, obtained hot wind is passed through waste heat boiler and boiler feedwater carries out heat exchange and generates steam and tail gas, steams
Vapour (800 DEG C of temperature) is back to boiler of power plant for generating electricity, and tail gas returns to electricity through blower unit as return air (450 DEG C of temperature)
Factory's boiler is for generating electricity；First and second flue gases are converged to return to (800 DEG C) feeding boiler of power plant of flue gas for generating electricity；It returns
Wind and the total flow for returning to flue gas are 12000Nm3/h；
The total flow of first flue gas and the second flue gas is equivalent to 5 volume % of boiler of power plant flue gas total flow.
Quality, the flue gas generated energy, (steam+tail gas+return flue gas) generated energy for measuring clean coal, the results are shown in Table 1.
Embodiment 7
(1) by 5000Nm3(lignite, partial size are raw coal of the first flue gas (900 DEG C) of/h to 6000kg in rotary kiln
20mm) indirect heating carries out coal and converts 60min, and final conversion temperature is to obtain the first flue gas, the first pyrolysis gas at 600 DEG C
With conversion coal；
(2) by 5000Nm3The second flue gas (900 DEG C) of/h carries out coal removing impurities to coal indirect heating is converted in rotary kiln
30min, final removing impurities temperature are 650 DEG C, obtain the second flue gas, the second pyrolysis gas and removing impurities coal；
(3) progress of removing impurities coal is dry and cold, obtain clean coal；
(4) tar removing is carried out after converging the first and second pyrolysis gas, obtains tar product；Coal gas will be obtained simultaneously
It is passed through mixed-burning furnace to burn, obtained hot wind is passed through waste heat boiler and boiler feedwater carries out heat exchange and generates steam and tail gas, steams
Vapour (800 DEG C of temperature) is back to boiler of power plant for generating electricity, and tail gas returns to electricity through blower unit as return air (450 DEG C of temperature)
Factory's boiler is for generating electricity；First and second flue gases are converged to return to (800 DEG C) feeding boiler of power plant of flue gas for generating electricity；It returns
Wind and the total flow for returning to flue gas are 12000Nm3/h；
The total flow of first flue gas and the second flue gas is equivalent to 5 volume % of boiler of power plant flue gas total flow.
Quality, the flue gas generated energy, (steam+tail gas+return flue gas) generated energy for measuring clean coal, the results are shown in Table 1.
Embodiment 8
(1) by 5000Nm3(lignite, partial size are raw coal of the first flue gas (900 DEG C) of/h to 4500kg in rotary kiln
20mm) indirect heating carries out coal and converts 45min, and final conversion temperature is to obtain the first flue gas, the first pyrolysis gas at 640 DEG C
With conversion coal；
(2) by 5000Nm3The second flue gas (900 DEG C) of/h carries out coal removing impurities to coal indirect heating is converted in rotary kiln
35min, final removing impurities temperature are 750 DEG C, obtain the second flue gas, the second pyrolysis gas and removing impurities coal；
(3) progress of removing impurities coal is dry and cold, obtain clean coal；
(4) tar removing is carried out after converging the first and second pyrolysis gas, obtains tar product；Coal gas will be obtained simultaneously
It is passed through mixed-burning furnace to burn, obtained hot wind is passed through waste heat boiler and boiler feedwater carries out heat exchange and generates steam and tail gas, steams
Vapour (800 DEG C of temperature) is back to boiler of power plant for generating electricity, and tail gas returns to electricity through blower unit as return air (450 DEG C of temperature)
Factory's boiler is for generating electricity；First and second flue gases are converged to return to (800 DEG C) feeding boiler of power plant of flue gas for generating electricity；It returns
Wind and the total flow for returning to flue gas are 12000Nm3/h；
The total flow of first flue gas and the second flue gas is equivalent to 5 volume % of boiler of power plant flue gas total flow.
Quality, the flue gas generated energy, (steam+tail gas+return flue gas) generated energy for measuring clean coal, the results are shown in Table 1.
Embodiment 9
(1) by 5000Nm3(lignite, partial size are raw coal of the first flue gas (900 DEG C) of/h to 4500kg in rotary kiln
20mm) indirect heating carries out coal and converts 50min, and final conversion temperature is to obtain the first flue gas, the first pyrolysis gas at 600 DEG C
With conversion coal；
(2) by 5000Nm3The second flue gas (900 DEG C) of/h carries out coal removing impurities to coal indirect heating is converted in rotary kiln
25min, final removing impurities temperature are 650 DEG C, obtain the second flue gas, the second pyrolysis gas and removing impurities coal；
(3) progress of removing impurities coal is dry and cold, obtain clean coal；
(4) tar removing is carried out after converging the first and second pyrolysis gas, obtains tar product；Coal gas will be obtained simultaneously
It is passed through mixed-burning furnace to burn, obtained hot wind is passed through waste heat boiler and boiler feedwater carries out heat exchange and generates steam and tail gas, steams
Vapour (800 DEG C of temperature) is back to boiler of power plant for generating electricity, and tail gas returns to electricity through blower unit as return air (450 DEG C of temperature)
Factory's boiler is for generating electricity；First and second flue gases are converged to return to (800 DEG C) feeding boiler of power plant of flue gas for generating electricity；It returns
Wind and the total flow for returning to flue gas are 12000Nm3/h；
The total flow of first flue gas and the second flue gas is equivalent to 5 volume % of boiler of power plant flue gas total flow.
Quality, the flue gas generated energy, (steam+tail gas+return flue gas) generated energy for measuring clean coal, the results are shown in Table 1.
Comparative example 1
(1) by 2000Nm3The power-plant flue gas (300 DEG C) of/h and the raw coal (lignite, partial size 20mm) of 4500kg are turning round
It is directly contacted in a counter-current configuration in kiln, carries out coal and convert 45min, final conversion temperature is to obtain the first raw coke oven gas at 200 DEG C
With conversion coal；
(2) by 8000Nm3The power-plant flue gas (900 DEG C) of/h directly contacts in rotary kiln in a counter-current configuration with conversion coal,
Coal removing impurities 40min is carried out, final removing impurities temperature is 820 DEG C, obtains the second raw coke oven gas and removing impurities coal；
(3) by removing impurities coal with air carry out it is dry put out, obtain clean coal；
(4) the first and second raw coke oven gas are converged for return air (9000Nm3/ h, 700 DEG C of temperature), and returned through air inducing unit
The burner of boiler of power plant is returned for generating electricity.
Above-mentioned power-plant flue gas total flow is equivalent to 5 volume % of boiler of power plant flue gas total flow.
Quality, flue gas generated energy and the return air generated energy for measuring clean coal, the results are shown in Table 1.
Comparative example 2
(1) by 2000Nm3The power-plant flue gas (300 DEG C) of/h and the raw coal (lignite, partial size 20mm) of 4500kg are in drying
It is dried at 200 DEG C of temperature, obtains conversion coal；
(2) by 4000Nm3The power-plant flue gas (900 DEG C) of/h is pyrolyzed at 600 DEG C of pyrolysis temperature with conversion coal
45min obtains semicoke, tar steam and coal gas；
(3) by 4000Nm3The power-plant flue gas (900 DEG C) and semicoke of/h is heated at 800 DEG C of removing impurities temperature, is obtained
Burnt and high-temperature gas mixture；
(4) coke is subjected to quenching, obtains product coke；
(5) crude tar oil, coal gas and high-temperature gas mixture are converged for return air (10000Nm3/ h, 750 DEG C of temperature), and through drawing
Wind unit returns to the burner of boiler of power plant for generating electricity.
The total flow of power-plant flue gas is equivalent to 5 volume % of boiler of power plant flue gas total flow.
Quality, flue gas generated energy and the return air generated energy for measuring clean coal, the results are shown in Table 2.
Comparative example 3
(1) by 10000Nm3The flue gas (900 DEG C) of/h and the raw coal (lignite, partial size 20mm) of 4500kg are turning round
It is directly contacted in a counter-current configuration in kiln, carries out coal and heat 45min, final heating temperature is 600 DEG C, obtains raw coke oven gas and coal system
Product；
(2) coal product is carried out dry and cold with air, obtains clean coal；
(3) by raw coke oven gas (9000Nm3/ h, 450 DEG C of temperature) as return air through blower unit return boiler of power plant burning
Device is for generating electricity.
Flue-gas flow rate is equivalent to 5 volume % of boiler of power plant flue gas total flow.
Quality, flue gas generated energy and the return air generated energy for measuring clean coal, the results are shown in Table 2.
Comparative example 4
(1) by 10000Nm3The flue gas (900 DEG C) of/h and the raw coal (lignite, partial size 20mm) of 4500kg are turning round
It is directly contacted in a counter-current configuration in kiln, carries out coal and heat 45min, final heating temperature is 750 DEG C, obtains raw coke oven gas and coal system
Product；
(2) coal product is carried out dry and cold with air, obtains clean coal；
(4) by raw coke oven gas (9000Nm3/ h, 450 DEG C of temperature) as return air through blower unit return boiler of power plant burning
Device is for generating electricity.
Flue-gas flow rate is equivalent to 5 volume % of boiler of power plant flue gas total flow.
Quality, flue gas generated energy and the return air generated energy for measuring clean coal, the results are shown in Table 2.
Table 1
Note:
The total flow of 1 first flue gas and the second flue gas is the volume hundred for the flue gas total flow that boiler of power plant generates
Score, volume %；
Volume ratio between 2 first flue gases and the second flue gas；
3 relative to 10000Nm3First flue gas and the second flue gas total flow, the inlet amount of raw coal；
The ratio between 4 transformation times and removing impurities time；
5 tail gas and the total flow for returning to flue gas are the percent by volume of the total flow of the first flue gas and the second flue gas,
Volume %；
6 tail gas and the total flow for returning to flue gas；
The 10000Nm that 7 power plant draw3Flue gas is for the electricity that can produce that generates electricity, to mark coal calculating；
8 steam, tail gas and return flue gas are for the electricity that can produce that generates electricity, to mark coal calculating.
Table 1 (continuous 1)
Table 1 (continuous 2)
Table 2
Note:
The total flow of 1 first flue gas and the second flue gas is the volume hundred for the flue gas total flow that boiler of power plant generates
Score, volume %；
Volume ratio between 2 first flue gases and the second flue gas；
3 relative to 10000Nm3First flue gas and the second flue gas total flow, the inlet amount of raw coal；
The ratio between 4 transformation times and removing impurities time；
5 return air flows account for the percent by volume of the flow of the first flue gas and the second flue gas, volume %；
The 10000Nm that 6 power plant draw3Flue gas is for the electricity that can produce that generates electricity, to mark coal calculating；
7 return air are for the electricity that can produce that generates electricity, to mark coal calculating.
Can be seen that by the result of embodiment and comparative example may be implemented together using the embodiment of method of the invention
The power generation of Shi Shixian power plant and clean coal production.
Embodiment uses method of the invention, and the quality of the clean coal of acquisition meets the people in DB13-2081-2014 standard
With the quality standard of scattered coal, and mercury content is low.And clean coal obtained in comparative example does not meet above-mentioned standard or does not obtain
Clean coal, and mercury content is high.
The hot flue gases of the method according to the invention, embodiment reference boiler of power plant produce clean coal, while raw coke oven gas
After extracting tar, the heat that obtained coal gas is recycled through mixed-burning furnace and waste heat boiler returns to power plant for generating electricity, and can increase power generation
Amount.
The effluent gas temperature limited in embodiment 4,5 is not in most preferred range, the first and second flues in embodiment 6
The volume ratio of gas is not in most preferred range, and raw coal inlet amount is not in the range of most preferably in embodiment 7,8 transfer of embodiment
Change temperature, removing impurities temperature not in the range of most preferably, transformation time and removing impurities time is not in most preferred model in embodiment 9
When enclosing interior, though can be with the clean coal of quality of production qualification, the generated energy of the heat recycled is not as good as the effect in embodiment 1-3
Fruit is good.
Do not have in comparative example 1-4 using method of the invention, the clean coal not only produced is unqualified, and the hair of return air
Electricity is reduced, and influences the power generation production of power plant.
The preferred embodiment of the present invention has been described above in detail, and still, the present invention is not limited thereto.Of the invention
, can be with various simple variants of the technical solution of the present invention are made in range of the technology design, including each technical characteristic is with any
Other suitable methods are combined, and it should also be regarded as the disclosure of the present invention for these simple variants and combination, are belonged to
In protection scope of the present invention.
Claims (10)
1. a kind of method of power plants generating electricity coupling production clean coal, comprising:
(1) with the first flue gas indirect heating raw coal of 800~1200 DEG C from boiler of power plant, coal conversion, the coal are carried out
Conversion final conversion temperature be 500~640 DEG C, transformation time be 10~60min, obtain the first flue gas, the first pyrolysis gas and
Convert coal；
(2) the second flue gas indirect heating of 800~1200 DEG C of coal from boiler of power plant of conversion is subjected to coal removing impurities,
The final removing impurities temperature of the coal removing impurities is 650~750 DEG C, and the removing impurities time is 10~60min, obtains the second flue gas, the second heat
It vents one's spleen and removing impurities coal；
(3) tar removing is carried out after converging the first pyrolysis gas and the second pyrolysis gas, obtains burnt oil and gas；
(4) coal gas is burnt and is exchanged heat, obtained steam and tail gas；The steam and tail gas return to boiler of power plant and use
In power generation；First flue gas and the second flue gas are converged to return to flue gas feeding boiler of power plant and being used to generate electricity；
(5) removing impurities coal is carried out dry and cold obtaining clean coal.
2. according to the method described in claim 1, wherein, the temperature of first flue gas and the second flue gas is 900~
1000℃。
3. according to the method described in claim 1, wherein, the total flow of first flue gas and the second flue gas is power plant's pot
1~30 volume %, preferably 5~20 volume %, more preferably 5~10 volume % of the total flow for the flue gas that furnace generates.
4. according to the method described in claim 1, wherein, the volume ratio between first flue gas and the second flue gas is (1
~4): 1, preferably (1~2): 1.
5. according to the method described in claim 1, wherein, relative to 10000Nm3First flue gas and the second flue gas
Total flow, the inlet amount of the raw coal is 3000~6000kg, preferably 4000~5000kg.
6. according to the method described in claim 1, wherein, the ratio between the transformation time and removing impurities time are (1~2): 1.
7. according to the method described in claim 1, wherein, the temperature for returning to flue gas is 750~900 DEG C；The steam
Temperature is 750~900 DEG C；The temperature of the tail gas is 300~500 DEG C, preferably 350~450 DEG C；The return flue gas and tail
The total flow of gas is 100~130 volume % of the total flow of first flue gas and the second flue gas, preferably 100~120
Volume %, more preferably 105~120 volume %.
8. according to the method described in claim 1, wherein, the raw coal is the lignite of 1~100mm of granularity, jet coal and does not glue
At least one of coal.
9. a kind of system for the method that production clean coal is coupled using power plants generating electricity described in any one of claim 1-8,
Include: boiler of power plant (1), raw coal removing impurities unit, condenser (6), mixed-burning furnace (7), waste heat boiler (8), dry and cold device (5) and draws
Wind apparatus (2)；Wherein,
The raw coal removing impurities unit removes raw coal for the flue gas from boiler of power plant (1) to be carried out indirect heating to raw coal
In impurity, obtain flue gas, pyrolysis gas and removing impurities coal, and flue gas is returned into boiler of power plant power generation；
Condenser (6) is used to recycle the tar in the pyrolysis gas from raw coal removing impurities unit, and obtains coal gas；
Coal gas of the mixed-burning furnace (7) for condenser in future (6) burns, and obtained hot wind is passed through waste heat boiler (8)
Heat exchange, which is carried out, with boiler feedwater obtains steam and tail gas；
Waste heat boiler (8) is connected to boiler of power plant (1) and blower unit (2), and the steam returns to boiler of power plant (1), the tail gas
Boiler of power plant (1) is returned through blower unit (2)；
Dry and cold device (5) by dry and cold method for being cooled down to obtain clean coal removing impurities coal.
10. system according to claim 9, wherein the raw coal removing impurities unit includes reforming unit (3) and removing impurities device
(4), wherein
Reforming unit (3) is connected to boiler of power plant (1), removing impurities device (4) and condenser (6)；Removing impurities device (4) is connected to boiler of power plant
(1), reforming unit (3), condenser (6) and dry and cold device (5).
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