CN105505471B - A kind of coal-water slurry gasification method for being suitable for processing ammonia nitrogen in high density, COD sewage - Google Patents

A kind of coal-water slurry gasification method for being suitable for processing ammonia nitrogen in high density, COD sewage Download PDF

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CN105505471B
CN105505471B CN201510943056.5A CN201510943056A CN105505471B CN 105505471 B CN105505471 B CN 105505471B CN 201510943056 A CN201510943056 A CN 201510943056A CN 105505471 B CN105505471 B CN 105505471B
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water
pipeline
coal
slurry
gas
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CN105505471A (en
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何巍
方林木
俞宏伟
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ZHEJIANG JINJU CHEMICAL CO Ltd
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ZHEJIANG JINJU CHEMICAL CO Ltd
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    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
    • C10J3/46—Gasification of granular or pulverulent flues in suspension
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F9/00—Multistage treatment of water, waste water or sewage
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10K—PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
    • C10K1/00—Purifying combustible gases containing carbon monoxide
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10K—PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
    • C10K1/00—Purifying combustible gases containing carbon monoxide
    • C10K1/08—Purifying combustible gases containing carbon monoxide by washing with liquids; Reviving the used wash liquors
    • C10K1/10—Purifying combustible gases containing carbon monoxide by washing with liquids; Reviving the used wash liquors with aqueous liquids
    • C10K1/101—Purifying combustible gases containing carbon monoxide by washing with liquids; Reviving the used wash liquors with aqueous liquids with water only
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/02—Treatment of water, waste water, or sewage by heating
    • C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
    • C02F1/048—Purification of waste water by evaporation
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/02—Aerobic processes

Abstract

The invention discloses a kind of coal-water slurry gasification methods for being suitable for processing ammonia nitrogen in high density, COD sewage, include the following steps：1) prepared by water-coal-slurry；2) it burns in coal slurry gasifier；3) washing cooling in quench chamber；4) ash collection discharges；5) raw gas purifying；6) carbon black Water warfare.The present invention needs to add the productive prospecting of part water using water-coal-slurry making, Qingjian River water is replaced to make coal water slurry process using sewage, efficiently solve the problems, such as slurryability, and it realizes sewage intercepting well and is not limited by ammonia nitrogen, COD concentration, and reach industrialization continuity production, using water-coal-slurry made of high-concentration sewage in the environment of 1400 DEG C of gasification, and combustion temperature, operating pressure are more than 2MPa, containing high concentration COD, ammonia-nitrogen sewage Pintsch process, processing is thorough, and useful synthesis ammonia, urea raw material are converted to, turn waste into wealth.

Description

A kind of coal-water slurry gasification method for being suitable for processing ammonia nitrogen in high density, COD sewage
Technical field
The present invention relates to a kind of coal-water slurry gasification methods for being suitable for processing ammonia nitrogen in high density, COD sewage.
Background technology
It is one of multiple production industry major pollutants discharged containing ammonia nitrogen, COD waste water, ammonia and nitrogen pollution is increasingly tight in water body Weight.Ammonia nitrogen can cause water eutrophication, lead to environmental pollution, and excessively high ammonia nitrogen concentration can inhibit nature to nitrify, cause water body Anoxic causes fish to be poisoned, and reduces water body self-purification ability, so cost-effectively the pollution of control ammonia nitrogen waste water is for environment There is important value.There are many ammonia nitrogen in high density, COD wastewater treatment methods at present, existing processing ammonia nitrogen in high density, COD sewage works Skill is common there are investment cost is big, operating cost is high, operation sequence is complicated, water outlet is difficult to control, generates the shortcomings of new pollution Technique is extremely difficult to the desired effect of processing, tightened up to enterprise's emission request with raising of the country to environmental requirement, highly concentrated Degree ammonia nitrogen, COD sewage disposals are more urgent.
Domestic water gas gasification technology is reached its maturity by development for many years.Such as CN100593509C discloses one kind and makes With the method for producing synthesis gas from hydrocarbon substance-containing slurry；CN1944592A discloses a kind of quench chamber unloading type water coal slurry gasifying work Skill and fast cooling device.Both techniques all using the hydrocarbon substance of state containing solid, liquid, water, auxiliary agent, additive raw material slurry, are not related to Processing containing ammonia nitrogen in high density, COD sewage.If you need to use high concentration ammonia nitrogen sewage slurrying, need to solve stability of coal slurry, flowing The technical problems such as property, viscosity, equipment and pipeline corrosion, environmental protection.
Invention content
Present invention aims at provided for the deficiency present in the prior art it is a kind of be suitable for processing ammonia nitrogen in high density, The technical solution of the coal-water slurry gasification method of COD sewage needs to add the productive prospecting of part water using water-coal-slurry making, Qingjian River water is replaced to make coal water slurry process using sewage, efficiently solve the problems, such as slurryability, and realize sewage intercepting well not It is limited by ammonia nitrogen, COD concentration, and reaches industrialization continuity production, fired using water-coal-slurry made of high-concentration sewage in gasification 1400 DEG C of temperature, operating pressure are burnt more than in the environment of 2MPa, containing high concentration COD, ammonia-nitrogen sewage Pintsch process, processing is thorough, And useful synthesis ammonia, urea raw material are converted to, turn waste into wealth.
In order to solve the above-mentioned technical problem, the present invention adopts the following technical scheme that：
A kind of coal-water slurry gasification method for being suitable for processing ammonia nitrogen in high density, COD sewage, it is characterised in that including such as Lower step：
1) prepared by water-coal-slurry
Bituminous coal, ammonia nitrogen, COD sewage and additive agent mixture are ground in the ball mill, water-coal-slurry, Ran Houtong is prepared It crosses first pipe and slurry is sent to slurry vessel, then sent water-coal-slurry to gasification furnace by shurry pump；
By being determined using the selectivity with when additive kind of different ore deposit point bituminous coal the sewage selection of various concentration Amount proportioning, solves the instability problem of water-coal-slurry containing high-concentration sewage.
2) it burns in coal slurry gasifier
Water-coal-slurry enters nozzle by second pipe, and extraneous oxygen enters nozzle by third pipeline, and central oxygen passes through Four pipelines enter the central tube of nozzle, and water-coal-slurry is collided with oxygen in jet hole, and water-coal-slurry is made uniformly to mix and obtain with oxygen Enter combustion furnace after to atomization, reaction generation water-gas is carried out under control burner hearth operation temperature and pressure condition, and make pollution Object decomposes completely；
3) washing cooling in quench chamber
The water-gas generated through combustion furnace enters detachable quench chamber, and cooling washings enter detachable urgency through the 5th pipeline Cold house is in direct contact with water-gas, is carried out heat exchange, the lime-ash in water-gas is washed, while reduce water-gas temperature Degree generates saturated steam；
Difference and other coal water slurry process, in order to adapt to burn containing ammonia nitrogen in high density, COD sewage, using plug-in detachable urgency Cold house, the quench chamber are connected with gasification furnace by large flange, had the benefit that：1. combustion furnace highly greatly increases, space becomes Greatly, reaction time is extended, it can be ensured that the ammonia nitrogen in sewage, COD and other carbon containing protiums give up in the case of a high temperature Liquid energy is enough burnt completely, is ensured that pollutant does not bring rear system into, is achieved the purpose that treated sewage；2. due to mixing burning sewage, chilling Room is easily corroded, and needs periodic inspection, replaces, and detachable quench chamber can remove maintenance and replacement, does not need to enter stove In thorax, maintenance is convenient, and the repair time is short, safer.
4) ash collection discharges
By the lime-ash that detachable quench chamber washes out through collect slag valve enter first collection slag ladle, after being collected into lime-ash, by pressure release, Lime-ash is discharged into detritus tank by deslagging operation through residual cake valve from the first collection slag ladle, and lime-ash picks up recycling by dragveyer, buck by Bilge flows into ash settling basin；
5) raw gas purifying
A, water-gas through the 6th pipeline enters surge tank after being come out from detachable quench chamber from bottom, with following in surge tank Ring water is in direct contact, and is washed the lime-ash to get off and the sooty water condensed out and is entered the second collection slag ladle, after being collected into lime-ash, by the 11 pipelines are sent to carbon black water treatment system；
B, water-gas sequentially enters level-one gas-liquid separator and two after surge tank comes out through the 7th pipeline, the 8th pipeline Grade gas-liquid separator, water-gas out enter demister through the 9th pipeline from the top of two level gas-liquid separator, are removed through demister Carbon black water droplet is removed, qualified coal gas is sent by the tenth pipeline to subsequent processing；
C, the sooty water separated from level-one gas-liquid separator, two level gas-liquid separator and demister is respectively via the tenth Two pipelines, the 13rd pipeline and the 14th pipeline are sent to carbon black water treatment system；
Ammonia nitrogen in high density, COD sewage are burnt in order to adapt to mix, the wash cooling water used has to pass through sooty water cleaning procedure It processes more clean rear can be used, that is, going out the sooty water of quench chamber, surge tank and gas-liquid separator etc. will all be recycled to Sooty water cleaning procedure is used by returning to this process after additive, biochemical aeration processing.
6) carbon black Water warfare
A, gasification carrys out sooty water via the 15th pipeline sleeve pipe heat exchanger recycling heat, then by the entrance of the 16th pipeline Flash tank carries out atmospheric flashing, and flashed vapour is directly vented through the 17th pipeline, and the sooty water through atmospheric flashing is through the 18th pipeline Into sooty water storage tank, flocculant enters the 19th pipeline through the 20th pipeline fully to be mixed with the sooty water from sooty water storage tank Enter ash settling basin after conjunction, and medicament is added in into ash settling basin, aeration biochemical is handled, ammonia nitrogen, COD in reduction sooty water, cyanogen root Ion, primary water are pumped to level-one defecator through the first water, by the overflow of level-one defecator to two level defecator, pass through the 20th One pipeline adds in antisludging agent into two level defecator, and the sooty water after clarification sends gasification process back to by the second water pump；
B, level-one defecator and the concentrate of two level defecator bottom are sent back to through the 22nd pipeline and the 23rd pipeline Ash settling basin.
Due to mixing burning high-concentration sewage, sooty water cleaning procedure of the present invention realizes cycle washings total recycle process, In raw gas washing process, a large amount of water evaporation that recycles generates saturated vapor, and saturated vapor participates in anti-in rear process and raw gas Should, therefore a large amount of recirculated water is had lost, it can add in and be supplemented containing the not high ammonia nitrogen of concentration, COD sewage, due to washing In sooty water afterwards also have a large amount of ammonia nitrogens, COD, in order to remove ammonia nitrogen, COD, cyanide ion in the sooty water of part etc. pollution because Son adds in sewage-treating agent progress biochemical aeration processing into ash settling basin.
Further, the burner hearth operation temperature in step 2) is 1300~1400 DEG C, pressure is 2~3MPa, and the residence time is big Reaction under the conditions of 8 seconds, this operation temperature, pressure and longer residence times is more thorough, improves the formation speed of water-gas.
Further, water-gas temperature is reduced in step 3) to 200 DEG C.
The present invention is by adopting the above-described technical solution, have the advantages that：
1st, water-coal-slurry and purity oxygen made of trade effluent fully burn under gasification furnace high-temperature, high pressure conditions, dirty The pollution factors such as ammonia nitrogen, organic matter in water are converted into carbon monoxide, carbon dioxide, hydrogen, are the originals for synthesizing ammonia, urea product Expect gas, turn waste into wealth, realize that sewage recycling utilizes；
2nd, reasonable design, appliance arrangement selection is inexpensive to be applicable in, technology original creation, and technique, electromechanical instrument design are simple, operation peace Entirely, civilwork engineering quantity is small, and Integrated comparative investment is minimum；
3rd, this technology scale is middle and small scale, and Hydrogen Vapor Pressure position 1~3MPa of mesolow is suitble to hydrogen manufacturing and rule of modernizing and expanding the existing factory Mould, especially small factory's transition；
4th, slurrying uses rod milling technology that can be gasified with using electricity wisely and do not set washing water-circulating pump, desulfurization separate unit circulating pump fortune Row, pressure swing adsorption decarbonization power consumption is extremely low, realizes that power consumption is minimum comprehensively, high electricity price area is more suitable for；
5th, each set equipment technique setting is simple, and reasonable benefit/risk, cost of investment is low, consumption is low, technologically advanced, operating aspect.
The present invention needs to add the productive prospecting of part water using water-coal-slurry making, Qingjian River water is replaced to make water using sewage Coal slurry technique efficiently solves the problems, such as slurryability, and realizes sewage intercepting well and do not limited by ammonia nitrogen, COD concentration, and reached Industrialization continuity produces, and is more than using water-coal-slurry made of high-concentration sewage in 1400 DEG C of gasification, and combustion temperature, operating pressure In the environment of 2MPa, residence time are more than 8 seconds, containing high concentration COD, ammonia-nitrogen sewage Pintsch process, processing is thorough, and has been converted to Synthesis ammonia, urea raw material, turn waste into wealth.
Description of the drawings
The invention will be further described below in conjunction with the accompanying drawings：
Fig. 1 is a kind of gas suitable for the coal-water slurry gasification method for handling ammonia nitrogen in high density, COD sewage of the present invention Change flow chart；
Fig. 2 is the sooty water purification process figure in the present invention.
In figure：1- ball mills；2- slurry vessels；3- shurry pumps；4- nozzles；5- combustion furnaces；6- detachable quench chambers；7- first Collect slag ladle；8- surge tanks；9- second collects slag ladle；10- level-one gas-liquid separators；11- two level gas-liquid separators；12- demisters； 13- heat exchangers；14- flash tanks；15- sooty water storage tanks；16- ash settling basins；The first water pumps of 17-；18- level-one defecators；19- two levels Defecator；The second water pumps of 20-；21- first pipes；22- second pipes；25- third pipelines；The 4th pipelines of 26-；29- the 5th is managed Road；The 6th pipelines of 30-；The 7th pipelines of 31-；The 8th pipelines of 32-；The 9th pipelines of 33-；The tenth pipelines of 34-；The 11st pipelines of 36-； The 12nd pipelines of 37-；The 13rd pipelines of 38-；The 14th pipelines of 39-；The 15th pipelines of 40-；The 16th pipelines of 41-；42- the tenth Seven pipelines；The 18th pipelines of 43-；The 19th pipelines of 44-；The 20th pipelines of 45-；The 21st pipelines of 48-；51- the 22nd Pipeline；The 23rd pipelines of 52-.
Specific embodiment
As shown in Figure 1 to Figure 2, it is a kind of coal water slurry gasification work for being suitable for processing ammonia nitrogen in high density, COD sewage of the present invention Process includes the following steps：
1) prepared by water-coal-slurry
It is ground in ball mill 1 by bituminous coal, containing ammonia nitrogen in high density, COD sewage and additive agent mixture, water coal is prepared Slurry, is then sent to slurry vessel 2 by slurry by first pipe 21, is then sent water-coal-slurry to gasification furnace by shurry pump 3；
By being determined using the selectivity with when additive kind of different ore deposit point bituminous coal the sewage selection of various concentration Amount proportioning, solves the instability problem of water-coal-slurry containing high-concentration sewage.
2) it burns in coal slurry gasifier
Water-coal-slurry enters nozzle 4 by second pipe 22, and extraneous oxygen enters nozzle 4, central oxygen by third pipeline 25 Enter the central tube of nozzle 4 by the 4th pipeline 26, water-coal-slurry and oxygen high velocity impact, make water-coal-slurry and oxygen in jet hole Enter combustion furnace 5 after uniformly mixing and be sufficiently atomized, carried out acutely under control burner hearth operation temperature and pressure condition Imperfect combustion reaction generation mainly contains the water-gas of carbon monoxide and hydrogen, burner hearth operation temperature is 1300~1400 DEG C, Pressure is 2~3MPa, and the reaction under this operation temperature and pressure condition is more thorough, improves the formation speed of water-gas, and make Pollutant decomposes completely；
3) washing cooling in quench chamber
The water-gas generated through combustion furnace 5 enters detachable quench chamber 6, and cooling washings enter detachable through the 5th pipeline 29 Formula quench chamber 6 is in direct contact with high-temperature water gas, is carried out heat exchange, most of lime-ash in water-gas is washed, together When reduce water-gas temperature, reduce water-gas temperature to 200 DEG C, generate a large amount of saturated steam, reach washing cooling mesh 's；
Difference and other coal water slurry process, in order to adapt to burn containing ammonia nitrogen in high density, COD sewage, using plug-in detachable urgency Cold house 6, the quench chamber are connected with gasification furnace by large flange, had the benefit that：1. 5 height of combustion furnace greatly increases, space Become larger, extend reaction time, it can be ensured that the ammonia nitrogen in sewage, COD and other carbon containing protiums in the case of a high temperature Waste liquid can burn completely, ensure that pollutant does not bring rear system into, achieve the purpose that treated sewage；It is 2. anxious due to mixing burning sewage Cold house is easily corroded, and needs periodic inspection, replaces, detachable quench chamber 6 can remove maintenance and replacement, not need to enter In burner hearth, maintenance is convenient, and the repair time is short, safer.
4) ash collection discharges
Enter the first collection slag ladle 7 through collecting slag valve by most of lime-ash that detachable quench chamber 6 washes out, be collected into lime-ash Afterwards, lime-ash is discharged into detritus tank through residual cake valve from the first collection slag ladle 7 by pressure release, deslagging operation, lime-ash is picked up by dragveyer Recycling, buck flow into ash settling basin 16 by Bilge；
5) raw gas purifying
A, water-gas through the 6th pipeline 30 enters surge tank 8 after being come out from detachable quench chamber 6 from bottom, in surge tank 8 It is interior to be in direct contact with recirculated water, it washs a small amount of lime-ash to get off and the sooty water condensed out enters the second collection slag ladle 9, be collected into After certain lime-ash, sent by the 11st pipeline 36 to carbon black water treatment system；
B, water-gas sequentially enters level-one gas-liquid separator after surge tank 8 comes out through the 7th pipeline 31, the 8th pipeline 32 10 and two level gas-liquid separator 11, water-gas out enters demister from the top of two level gas-liquid separator 11 through the 9th pipeline 33 12, carbon black water droplet is removed through demister 12, qualified coal gas is sent by the tenth pipeline 34 to subsequent processing, carries out transformation post；
C, the sooty water separated from level-one gas-liquid separator 10, two level gas-liquid separator 11 and demister 12 passes through respectively It is sent by the 12nd pipeline 37, the 13rd pipeline 38 and the 14th pipeline 39 to carbon black water treatment system；
Ammonia nitrogen in high density, COD sewage are burnt in order to adapt to mix, the wash cooling water used has to pass through sooty water cleaning procedure It processes more clean rear can be used, that is, going out the sooty water of quench chamber, surge tank 8 and gas-liquid separator etc. will all be recycled to Sooty water cleaning procedure is used by returning to this process after additive, biochemical aeration processing.
6) carbon black Water warfare
A, gasification carrys out sooty water via 40 sleeve pipe heat exchanger 13 of the 15th pipeline recycling heat, then by the 16th pipeline 41, which enter flash tank 14, carries out atmospheric flashing, and flashed vapour is directly vented through the 17th pipeline 42, the sooty water warp through atmospheric flashing 18th pipeline 43 enters sooty water storage tank 15, and flocculant enters the 19th pipeline 44 with coming from sooty water through the 20th pipeline 45 The sooty water of storage tank 15 enters ash settling basin 16, and medicament is added in into ash settling basin 16 after being sufficiently mixed, and aeration biochemical processing reduces Ammonia nitrogen, COD, cyanide ion in sooty water, primary water are sent through the first water pump 17 to level-one defecator 18, pass through level-one defecator 18 overflows are added in antisludging agent into two level defecator 19 by the 21st pipeline 48, to two level defecator 19 after clarification Sooty water sends gasification process back to by the second water pump 20；
B, the concentrate of 19 bottom of level-one defecator 18 and two level defecator is managed through the 22nd pipeline the 51 and the 23rd Ash settling basin 16 is sent in road 52 back to.
Due to mixing burning high-concentration sewage, sooty water cleaning procedure of the present invention realizes cycle washings total recycle process, In raw gas washing process, a large amount of water evaporation that recycles generates saturated vapor, and saturated vapor participates in anti-in rear process and raw gas Should, therefore a large amount of recirculated water is had lost, it can add in and be supplemented containing the not high ammonia nitrogen of concentration, COD sewage, due to washing In sooty water afterwards also have a large amount of ammonia nitrogens, COD, in order to remove ammonia nitrogen, COD, cyanide ion in the sooty water of part etc. pollution because Son adds in sewage-treating agent progress biochemical aeration processing into ash settling basin 16.
1.3 ten thousand Nm3/ h high-concentration sewage device for producing hydrogen operating index
1st, coal slurry gasifier operation consumption：Ton ammonia 1.38~1.42t/t of coal consumption, compares coal consumption：560~610
2nd, power consumption (electric quality：≥380V)：150~180kwh/t of ton ammonia power consumption (without space division, synthesis)
3rd, wastewater treatment：0.6~0.8t/t of ton ammonia treatment sewage
4th, oxygen consumption (oxygen quality：>=99.5%)：Ton ammonia oxygen consumes 820~880Nm3/ h is consumed than oxygen：360~415Nm3/ KNm3(CO+H2)
5th, byproduct steam：0.4t/t ammonia
6th, yield：99.9%H21.3 ten thousand Nm of tolerance3/ h, 50,000 t/ of folding ammonia
7th, coal water slurry gasification producer gas composition：H2：30~40%；CO：40~49%；CO2:15~20%；O2：≤ 0.2%；CH4：≤ 1.0%.
8th, purified gas composition：H2>=90%
9th, hydrogen composition：H2>=99.9%
10th, the quality of gas：Coal gas：Temperature：160~220 DEG C, pressure：1.8~3.0MPa；
Hydrogen：Temperature：30~40 DEG C, pressure：1.6~2.5MPa.
It these are only specific embodiments of the present invention, but the technical characteristic of the present invention is not limited thereto.It is any with this hair Based on bright, to realize essentially identical technique effect, made ground simple change, equivalent replacement or modification etc., all cover Among protection scope of the present invention.

Claims (1)

  1. A kind of 1. coal-water slurry gasification method for being suitable for processing ammonia nitrogen in high density, COD sewage, it is characterised in that including as follows Step：
    1) prepared by water-coal-slurry
    Bituminous coal, ammonia nitrogen, COD sewage and additive agent mixture are ground in the ball mill, water-coal-slurry is prepared, then passes through Slurry is sent to slurry vessel by one pipeline, is then sent the water-coal-slurry to gasification furnace by shurry pump；
    2) it burns in coal slurry gasifier
    The water-coal-slurry enters nozzle by second pipe, and extraneous oxygen enters the nozzle by third pipeline, and central oxygen is led to The central tube that the 4th pipeline enters the nozzle is crossed, the water-coal-slurry is collided with oxygen in the jet hole, makes the water coal Slurry uniformly mixes with the oxygen and enters combustion furnace after atomized, is carried out under control burner hearth operation temperature and pressure condition Reaction generation water-gas, and pollutant is made to decompose completely, the burner hearth operation temperature is 1300~1400 DEG C, the pressure is 2 ~3MPa, residence time are more than 8 seconds；
    3) washing cooling in quench chamber
    The water-gas generated through the combustion furnace enters detachable quench chamber, and cooling washings are through described in the entrance of the 5th pipeline Detachable quench chamber is in direct contact with water-gas, is carried out heat exchange, the lime-ash in water-gas is washed, while reduce water Gas temperature reduces the water-gas temperature to 200 DEG C, generates saturated steam；
    4) ash collection discharges
    Enter the first collection slag ladle through collecting slag valve by the lime-ash that the detachable quench chamber washes out, be collected into the lime-ash Afterwards, the lime-ash is discharged into detritus tank through residual cake valve from the described first collection slag ladle by pressure release, deslagging operation, the lime-ash by Dragveyer picks up recycling, and buck flows into ash settling basin by Bilge；
    5) raw gas purifying
    A, the water-gas through the 6th pipeline enters surge tank after being come out from the detachable quench chamber from bottom, in the buffering It is in direct contact in tank with recirculated water, washs the lime-ash to get off and the sooty water condensed out enters the second collection slag ladle, be collected into ash After slag, sent by the 11st pipeline to carbon black water treatment system；
    B, the water-gas sequentially enters level-one gas-liquid separator after the surge tank comes out through the 7th pipeline, the 8th pipeline With two level gas-liquid separator, the water-gas out enters foam removal from the top of the two level gas-liquid separator through the 9th pipeline Device removes carbon black water droplet through the demister, and qualified coal gas is sent by the tenth pipeline to subsequent processing；
    C, the sooty water difference separated from the level-one gas-liquid separator, the two level gas-liquid separator and the demister It is sent via the 12nd pipeline, the 13rd pipeline and the 14th pipeline to the carbon black water treatment system；
    6) carbon black Water warfare
    A, gasification carrys out sooty water and recycles heat via the 15th pipeline sleeve pipe heat exchanger, then by the 16th pipeline enter flash distillation Tank carries out atmospheric flashing, and flashed vapour is directly vented through the 17th pipeline, and the sooty water through atmospheric flashing enters through the 18th pipeline Sooty water storage tank, flocculant enters the 19th pipeline through the 20th pipeline fully to be mixed with the sooty water from the sooty water storage tank Enter the ash settling basin after conjunction, and medicament is added in into the ash settling basin, aeration biochemical processing reduces the ammonia in the sooty water Nitrogen, COD, cyanide ion, primary water are pumped to level-one defecator through the first water, clear to two level by the level-one defecator overflow Clear slot is added in antisludging agent into the two level defecator by the 21st pipeline, and the sooty water after clarification is by second Water pump sends gasification process back to；
    B, the level-one defecator and the concentrate of the two level defecator bottom are through the 22nd pipeline and the 23rd pipeline Send the ash settling basin back to.
CN201510943056.5A 2015-12-16 2015-12-16 A kind of coal-water slurry gasification method for being suitable for processing ammonia nitrogen in high density, COD sewage Active CN105505471B (en)

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CN110665260A (en) * 2019-09-09 2020-01-10 山西晋城无烟煤矿业集团有限责任公司 Entrained flow coal gasification black ash water sedimentation and dispersion system and black ash water sedimentation method thereof
CN111234891B (en) * 2020-02-10 2022-10-18 内蒙古大学 Method for preparing high-performance coal water slurry by utilizing ammonia-containing wastewater in coal chemical industry
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